From b0d3c2e4da9c9042e41eff14d6daa4cdf4f8350c Mon Sep 17 00:00:00 2001 From: Sergey Poznyakoff Date: Fri, 12 Jun 2009 23:37:53 +0300 Subject: [PATCH] Keep a pool of sockmap connections. This patch eliminates the sockmap bottleneck by keeping a pool of open sockmap connections. The sockmaps in the pool can be queried in parallel. * include/sm/map.h (SMPO_MIN_OCONN, SMPO_MAX_OCONN) (SMPO_IDLE): New constants. * include/sm/mapcnf.h (struct mst_socket_S): New members: mst_socket_min_oconn and mst_socket_max_oconn. * include/sm/mapcnfdef.h (mst_socket_defs): Handle new keywords: min_connections, max_connections and timeout. * libsmmap/t-sockmap-1.c: New file. * libsmmap/Makefile.am (TESTC): Add t-sockmapr-1 * libsmmap/mapconfopen.c (sm_mapconfopen): Initialize SMPO_MIN_OCONN and SMPO_MAX_OCONN. * libsmmap/sockmap.c: Rewrite to keep a pool of sockmap connections. * libsmmap/sockmapimpl.c: Likewise. * libsmmap/sockmap.h (struct sm_sockmap_instance_S): New structure. (struct sm_sockmap_S): Remove sockmap_fp. Add sockmap_lock, sockmap_inst, sockmap_min, sockmap_max and sockmap_idle. --- doc/README.dvi | Bin 290916 -> 0 bytes doc/README.ps |10229 ------------------------------------------------ doc/README.txt | 4723 ---------------------- include/sm/map.h | 7 + include/sm/mapcnf.h | 2 + include/sm/mapcnfdef.h | 18 + libsmmap/Makefile.am | 7 + libsmmap/mapconfopen.c | 2 + libsmmap/sockmap.c | 97 +- libsmmap/sockmap.h | 17 +- libsmmap/sockmapimpl.c | 465 ++- libsmmap/t-sockmap-1.c | 264 ++ 12 files changed, 683 insertions(+), 15148 deletions(-) delete mode 100644 doc/README.dvi delete mode 100644 doc/README.ps delete mode 100644 doc/README.txt create mode 100644 libsmmap/t-sockmap-1.c diff --git a/doc/README.dvi b/doc/README.dvi deleted file mode 100644 index 8da450a91621f4b3455819a31410cdf840c1cf0a..0000000000000000000000000000000000000000 GIT binary patch literal 0 HcmV?d00001 literal 290916 zcmeFa34EMadGD`iWScA`1OkL45HPuk43;d(jikC#hjvY%5p&>ORX(UfPi#+eh 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Distribution - + Building MeTA1 - o Compile-Time Configuration Options - + Test Programs - o Environment Variables used by Test Programs - o Known Test Program Problems - + Installing MeTA1 - o Directories, Files, and Permissions - o Upgrading from earlier MeTA1 Versions - - * Run-Time Configuration of MeTA1 - + Overview - + Configuration File Syntax - o Configuration File Values - + Example Configuration File - + Common Global Configuration - + Common Configuration Options - + Pathnames for Files, Directories, and Maps - + Configuration for MCP - + Configuration for QMGR - o Configuration Map for QMGR - + Configuration for SMAR - o Declaring Maps for SMAR - o Configuration Options for SMAR - o Configuration Maps for SMAR - o Greylisting - + Configuration for SMTP Server - o SMTP Server Session Configuration - o Multiple SMTP Servers with different Configurations - o Protecting Recipients - + Configuration for SMTP Client - o SMTP Client Session/Recipient Configuration - + Lookup Orders - o Lookup Orders in Maps - o Lookup Orders for Anti-Spam Measures - o Macro Replacements in RHS - + STARTTLS Restrictions - + VERP - - * Running MeTA1 - + Starting MeTA1 - + Using MeTA1 only for Outgoing Mail - + Using MeTA1 for Incoming Mail - o Local Delivery and Specifying Local Domains - o Specifying Valid Local Addresses - + Using MeTA1 as Gateway - + Using MeTA1 as Backup MX Server - o Note about Backup MX Servers - + Miscellaneous Programs - o Do not run programs as root User - o Displaying Content of Mail Queues - o Interacting with QMGR - + Reloading Maps - + Logging - o Logfile Rotation - + Regular Checks - + Dealing with Errors - o Resource Problems - o Database Problems - o Writing Core Dumps - + Replacements for Features available in other MTAs - - * Policy Milter - + Policy Milter Overview - + Native Policy Milter API - o Data Structures - o Start and Stop - o New SMTP Server - o SMTP Session and Transaction - o Set and Get pmilter Contexts - o Accessing MTA Symbols - o Sender Modification - o Recipient Modifications - o Header Modifications - o Message Replacement - o Further Capabilities - o Miscellaneous Functions - o Return Values - o Implementation Notes - + Policy Milter Examples - - * Miscellaneous - + Troubleshooting - o Startup Problems - o Logfile Entries - + Caveats - + Checks in SMTP Server - o Strict RFC Compliance - o Various Checks - + Security Checks - + Restrictions - + Code Review, Enhancements, Patches - + Porting - + Version Naming - o Snapshots - - * Data Flow in MeTA1 - + Data Flow in MeTA1 - - * Advanced Configuration Options - + Overview - o Flags - + Advanced Configuration for MCP - + Advanced Configuration for QMGR - + Advanced Configuration for SMAR - + Advanced Configuration for SMTP Server - + Advanced Configuration for SMTP Client - - * Tuning - + Size of Queues, Caches, and Databases - + Disk I/O - + Processes and Threads - - * Format Specifications - + Socket Map - + Format of Session/Transaction Identifiers - + Logfile Format - + Format of Received Header - + Format of DSNs - - * Setup for STARTTLS - + Certificates for STARTTLS - - * More About Configuration, Compilation, Debugging, and Testing - + Compile Time Options - o Generic - o QMGR - o SMAR - o SMTPS - o Debugging Compile Time Options - + Possible Compilation Problems or Warnings - + More About Test Programs - o More Environment Variables used by Test Programs - o Other Potential Problems with Test Programs - - * Licenses - * Bibliography - * Index - -Introduction to MeTA1 - -MeTA1 is a Message Transfer Agent - -This distribution contains the source code for MeTA1 which implements a -message transfer agent (MTA). It supports the Simple Mail Transfer -Protocol (SMTP) as specified by RFC 2821 [Kle01] and various extensions, -e.g., STARTTLS [Hof99], AUTH [Mye99], PIPELINING [Fre00], as well as other -protocols, e.g., LMTP [Mye96]. - -MeTA1 is intended to be used as a secure and efficient mail gateway. It -does not provide any mail content modification capabilities, e.g., -masquerading of addresses or changing (addition, removal) of headers. -Later versions will probably add such capabilities. - - -Main Components of MeTA1 - -MeTA1 is a modularized message transfer agent consisting of five (or more) -persistent processes, four of which are multi-threaded. A central queue -manager (QMGR) controls SMTP servers (SMTPS) and SMTP clients (SMTPC) to -receive and send e-mails, an address resolver (SMAR) provides lookups in -various maps including DNS for mail routing, and a main control program -(MCP) starts the others processes and watches over their execution. The -queue manager organizes the flow of messages through the system and -provides measures to avoid overloading the local or remote systems by -implementing a central control instance. - -More information about each component will be given in the appropriate -sections. Complete documentation and background information can be found -in [Assmb]. Section 7.1 describes the data flow in MeTA1, the following is -a brief summary. Figure 1.1 shows the interaction of the various -components and databases^1.1. Incoming messages are accepted by an SMTP -server (SMTPS) which stores the messages in the content database (CDB). -The envelope information, i.e., sender and recipients, is stored by the -queue manager in an incoming queue (IQDB) and written to disk to the -incoming queue backup database (IBDB). For a delivery, the envelope -information must be transferred into the active queue (AQ). The scheduler -in QMGR takes recipient envelopes from AQ and creates transactions which -are given to an SMTP client (SMTPC) for delivery. An SMTP client takes the -transaction information and tries to send a message whose content is read -from CDB. After a successful delivery attempt a record is written to IBDB -that logs this information. The deferred envelope database (DEFEDB) is -only used if a message cannot be delivered during the first attempt. - - Figure 1.1: MeTA1: Overall Structure - -\begin{picture}(120, 120)\ -epsfxsize 120mm\leavevmode\ -epsffile{overview1.eps}\end -{picture} - -This version of MeTA1 does not come with a local delivery agent nor a mail -submission program. See Sections 4.3.1 and 4.2 which programs can be used -to achieve the desired functionality. - - -Documentation - -The document ``sendmail X: Requirements, Architecture, and Functional -Specification'' [Assmb] provides the background about the MeTA1 design, -its architecture, as well as the functional specification, and details -about the implementation. - -Typographical Conventions - -In this documentation, a command written as - -$ command - -should be executed as an unprivileged user. Only a command written as - -# command - -should be executed as the superuser. - -If a command contains components that need to be replaced by values that -depend on the environment or the local configuration, then it is usually -written as a macro, e.g., $LOGFILE. - -A number in parentheses behind a command or function refers to the manual -section, e.g., syslog(3), as it is usual for Unix documents. - -Version - -This document has been written for MeTA1-1.0.PreAlpha24.1, see also the -greeting of the SMTP server and the version output of the main components. -See Section 6.8 for information about version naming. - -Current State - -There are still some error conditions which may not be handled gracefully, -i.e., in case of some resource problems (e.g., out of memory or out of -disk space) the system may abort; however, this is common for most open -source MTAs which simply abort if they are running out of memory. See -Section 4.10.1 how to deal with those conditions. The software is running -since 2004-01-01 as MTA on the main machine of the author without any -significant problem, i.e., it never lost any mail. - - -Providing Feedback - -Please report bugs and provide feedback either to the developers list[ -Assma] (if you are subscribed) or directly to^1.2: - - < MeTA1 + feedback (at) MeTA1 . org > - -Feedback about the code, the documentation (including typographical, -syntactical, and grammatical errors, pointing out parts that are not well -enough explained, etc.), as well as patches and enhancements are highly -appreciated. - -For the Impatient - -For those who do not want to read the entire documentation, it is adviced -to read at least sections 2.2 and 2.4, and the appropriate section of -Chapter 4. - -Building, Testing, and Installing MeTA1 - - -Verifying the Source Code Distribution - -The source code is distributed as a (compressed) tar file and is -accompanied by a PGP signature file which has the same name as the tar -file plus the ending .sig. To verify the integrity of the source code PGP -[PGP] or GPG [Gnu] are required as well as the MeTA1 PGP signing key [MeT -]: - -$ gpg -verify meta1-$VERSION.tar.gz.sig -or: -$ pgp meta1-$VERSION.tar.gz.sig meta1-$VERSION.tar.gz - -Further information, especially about warnings or possible errors, can be -found in the documentation for PGP or GPG. - - -Building MeTA1 - -MeTA1 uses a configure file generated by GNU autoconf for configuration. -Hence you can build it (after verifying and unpacking the distribution) as -follows: - -$ mkdir obj.$OS && cd obj.$OS && $PATHTO/meta1-$VERSION/configure $OPTIONS \ - && make && make check - -Obviously you have to replace $OS, $VERSION, $OPTIONS, as well as $PATHTO. -It is also possible to build MeTA1 in the source tree, however, this is -discouraged: - -$ ./configure && make && make check - -Notes: do not run this as root; this is not just a basic security measure -(only use a privileged account if it is really required), but most of the -programs refuse to run with root privileges. It might be useful to save -the output of these commands^2.1for later inspection. - - -Compile-Time Configuration Options - -Beside the usual configure options like --prefix a few MeTA1 specific -configuration options are available: - - --enable-TLS Enable check for STARTTLS support. The default is yes, - i.e., configure tries to determine whether OpenSSL is available on the - machine. Requires OpenSSL 0.9.6 or newer [Ope]. Note: check the - OpenSSL website [Ope] for security announcement and be aware that due - to the complexity of the software it may cause (security) problems. - - --enable-SASL Enable check for AUTH support. The default is yes, i.e., - configure tries to determine whether Cyrus SASL v2 is available on the - machine. Requires Cyrus SASL version 2.1.18 or newer [Cyr]. Notes: - 1. check http://asg.web.cmu.edu/cyrus/ and http://asg.web.cmu.edu/ - sasl/ for security announcement and be aware that due to the - complexity of the software it may cause (security) problems. - 2. If Cyrus SASL uses Berkeley DB then it is necessary that the - version which has been used during compilation matches the version - that it is linked against. - - --with-sasl-libdir=path Path to directory containing Cyrus SASL v2 - library. - - --with-sasl-incdir=path Path to directory containing Cyrus SASL v2 - include files. - - --disable-included-bdb MeTA1 ships with a modified version of Berkeley - DB 4.3.28 which is built and used by default. To use a different - version of Berkeley DB (it must be 4.3, 4.2, or 4.1), e.g., one that - is part of the host OS, specify --disable-included-bdb. - - Notes: - 1. If you do not use the Berkeley DB version that comes with MeTA1, - make sure you run all the tests. For example, with Berkeley DB - 4.2.50 on OpenBSD 3.2/i386 at least one of the test programs fails - and hence this combination must not be used. Moreover, if you - encounter a problem using some other BDB version then you must try - to reproduce the problem with the shipped version before reporting - a possible bug. - 2. Do not use Berkeley DB 4.3.27/28 in 64 bit mode on Solaris 5.8/9 - as it crashes at least in those configurations^2.2. This bug is - fixed in the version that is distributed with MeTA1. - - --with-bdb-libdir=path Path to directory containing Berkeley DB - library. This option is only needed if --disable-included-bdb is used - and Berkeley DB is not installed in a location that the compiler or - linker use by default. Note: configure currently checks only for a - static library. - - --with-bdb-incdir=path Path to directory containing Berkeley DB - include files. This option is only needed if --disable-included-bdb is - used and Berkeley DB is not installed in a location that the compiler - uses by default. Example: - - $ B=/usr/local/BerkeleyDB.4.3 - $ $PATHTO/meta1-$VERSION/configure --with-bdb-libdir=$B/lib \ - --with-bdb-incdir=$B/include --disable-included-bdb - - --enable-pmilter Enable policy milter protocol, see Chapter 5. - - --enable-msp Enable a simple mail submission program (MSP) that is - currently not supported (located in contrib/). This is just a helper - program for those who do not want to install a different MSP but need - only some basic functionality (which does not include a queueing - mechanism). Note: this will install the MSP as sendmail thus - overriding any existing program of that name (as well as a man page). - - --enable-tinycdb Enable support for cdb map type, based on tinycdb - 0.75 [Tok]. - -To get the current list of configuration options, use configure --help. - - -Test Programs - -$ make check - -will run all test programs; currently those tests take about eighty -minutes to run on a standard workstation. For each of the test programs -one line is printed to denote whether the test succeeded, i.e., the output -consists of lines with the marker PASS: or FAIL: and the name of the test -program program. Additional output might be generated by the test programs -themselves, e.g., - -2 of 2 tests completed successfully, - -or some debug output. The debug output may even indicate an error, but -only a final FAIL: indicates a test failure. Some tests depend on -compilation options and are only conditionally enabled; others may depend -on environment variables, see 2.3.1. For disabled tests SKIP is shown. - -Since some of the tests may fail (see Section 2.3.2) and make will usually -stop after encountering an error, it might be required to use - -$ make -i check >check.out 2>&1 - -to perform all tests. - - -Environment Variables used by Test Programs - -Environment variables can be used to disable some test programs if -required or change the behavior of some test programs. These environment -variables and their effects are: - - * MTA_NO_DNS_TEST: disable tests that perform DNS lookups. These lookups - may use domains that are under control of the MeTA1 author. - - * MTA_DNS_TIMEOUT: can be used to set a different timeout than the - default, however, it may not be obeyed by all DNS test programs. - - * MTA_TEST_DNS_TIMING: run DNS tests that are timing dependent and may - fail under certain conditions (e.g., network too slow). - - * MTA_TIMING: run MTA tests that are timing dependent and may fail under - certain conditions. - - * MTA_STOPONERROR: causes most test scripts that perform multiple checks - to stop on the first error that occurs instead of performing all - checks. - - * MTA_NO_LOG_TEST: disables some tests that use syslog(3). - - * MTA_NO_SLOW_TEST: disables some tests that take a very long time. - -In this example the DNS timeout is set to 60 seconds and tests that take a -very long time are disabled: - -$ MTA_DNS_TIMEOUT=60 -$ MTA_NO_SLOW_TEST=1 -$ export MTA_DNS_TIMEOUT MTA_NO_SLOW_TEST -$ make -i check - - -Known Test Program Problems - - * connctl.sh will fail on systems that have neither inet_pton(3) nor - inet_aton(3). Fix: upgrade your OS or write a replacement function and - put it into librepl/. - * t-evthr-slp can fail in some circumstances if the OS is busy with - other tasks as it depends on the OS scheduler. Fix: just rerun the - test. - * t-evthr-sig.sh fails on Linux systems that use a thread implementation - that is not POSIX compliant. The test is currently disabled on all - Linux versions. Note: if you know a simple way to figure out whether - the OS actually provides POSIX compliant pthreads, please let me know. - * t-hostname fails on systems where gethostname() does not return any - FQHN at all (e.g., default SunOS 4/5 installations). Add the FQHN as - alias to /etc/hosts (see hosts(5) to solve this problem, e.g., - - 10.1.2.3 myname myname.my.domain - - or - - 10.1.2.3 myname.my.domain myname - - * t-parsesockstr fails on systems like AIX which treat an empty string - as a valid IP address in inet_addr(3). - - * t-mts-icr.sh and t-mts-ocr-?.sh try to test incoming/outgoing rate - control. They rely on the time it takes to send/receive mails which - may not work on machines that are significantly slower or faster than - the machines available to the author. - - * t-smar-0.sh, t-smar-3.sh, and t-dns-1.sh may fail sometimes due to DNS - timeouts. Run the tests again or increase the DNS timeout, see Section - 2.3.1. - -Note: DNS related test programs may fail if the first nameserver entry in -/etc/resolv.conf does not respond properly (and reasonably fast) to DNS -queries. See Section 12.3.1 how to override the default nameserver -selection: MTA_NAMESERVER. - -For more information about possible test program problems see Section -12.3.2. For problems with programs in the contrib/ directory, see contrib/ -README. - - -Installing MeTA1 - -MeTA1 needs several users to provide separation of privileges and to -enhance security. Currently there are four required accounts (the numbers -for uid and gid are examples only); the last one listed below (meta1) is -not really required: - -meta1s:*:260:260:meta1 SMTPS:/nonexistent:/sbin/nologin -meta1q:*:261:261:meta1 QMGR:/nonexistent:/sbin/nologin -meta1c:*:262:262:meta1 SMTPC:/nonexistent:/sbin/nologin -meta1m:*:263:263:meta1 misc:/nonexistent:/sbin/nologin -meta1:*:264:264:meta1 other:/nonexistent:/sbin/nologin - -with the corresponding groups: - -meta1s:*:260: -meta1q:*:261: -meta1c:*:262:meta1s -meta1m:*:263:meta1s,meta1q -meta1:*:264: - -Note: on some operating systems the star character is not a valid value -for the password field. Check passwd(5)^2.3to determine which value to use -to disable the password. - -To check whether the required users and groups exist, run - -$ ./misc/sm.check.sh -p - -(in the build directory); see below how to override the default values for -the user and group names. - -A shell script to setup the directories, files, etc. as described below is -available in misc/sm.setup.sh.in. This script is modified by configure to -create misc/sm.setup.sh (in the build directory) which is invoked when - -# make install - -is called. Most defaults in the installation script misc/sm.setup.sh can -be overridden with environment variables (default is listed in square -brackets): - - * MTACONFDIR: [/etc/meta1] configuration directory. - * MTAQDIR: [/var/spool/meta1] queue directory; communication sockets are - created in this directory by default too. - * MTALOGDIR: [.] logging directory (relative to MTAQDIR). If logging is - done via syslog(3) then this directory is not used. - * MTAS [meta1s] SMTP Server user and group. - * MTAC [meta1c] SMTP Client user and group. - * MTAQ [meta1q] QMGR user and group. - * MTAM [meta1m] address resolver (misc) user and group. - * MTA [meta1] generic (configuration etc) user and group. - * MTALG group for logfiles; the install program tries operator, - sysadmin, and root. - -Important Notes: - - 1. The users and groups must be created before make install is invoked. - - 2. misc/sm.setup.sh will not overwrite existing files or directories, - hence it does not work for upgrading a system if configuration files - or directory/file owners need to changed. - - -Directories, Files, and Permissions - -make install (i.e., misc/sm.setup.sh) will create all the required -directories and files with the correct permissions provided the users and -groups have been set up properly. This section explains what the created -structure looks like. - -The CDB directories (0-9, A-F) must be owned by meta1s and have group -meta1q with the permissions 0771: - -drwxrwx--x 2 meta1s meta1q 0/ - -Note: this means that everyone with access to the machine can guess the -name of content files (see Section 10.2 for the format; the names can also -be read from the logfiles if those are world-readable) and list (ls(1)) -them, however, they cannot access the content files as those are owned by -meta1s with mode 0640 and group meta1c, e.g., - --rw-r----- 1 meta1s meta1c 1993 Jul 9 21:19 2/S000000000006B1D200 - -The main (DEFEDB) and incoming queues (IBDB) must belong to meta1q and -should not accessible by anyone else: - -drwx------ 2 meta1q meta1q defedb/ -drwx------ 2 meta1q meta1q ibdb/ -drwx------ 2 meta1q meta1q ibdb/ibdb/ - -Mailertable, aliases map, and other maps for SMAR (see Section 3.9.3) -should belong to meta1m and can be readable as local conventions require: - --rw-r--r-- 1 meta1m meta1m mt --rw-r--r-- 1 meta1m meta1m aliases.db - -In general, maps should be owned by the user id of the program that uses -them, e.g., meta1q owns the QMGR configuration map qmgr_conf.db (see -Section 3.8.1). - -The meta1 configuration file can either belong to root or the generic -meta1 user: - --rw-r--r-- 1 meta1 meta1 meta1.conf - -The directories in which the communication sockets between QMGR and the -other programs are located must belong to meta1q and be group accessible -for the corresponding program: - -drwxrws--- 2 meta1q meta1m qmsmar/ -drwxrws--- 2 meta1q meta1c qmsmtpc/ -drwxrws--- 2 meta1q meta1s qmsmtps/ - -The directory in which the communication socket between MCP and SMTPS is -located must belong to meta1s: - -drwxr-x--- 2 meta1s meta1s smtps/ - -The logfiles must be owned by the corresponding user and may have relaxed -group (or even world) read permissions: - --rw-r----- 1 meta1q operator qmgr.log --rw-r----- 1 meta1m operator smar.log --rw-r----- 1 meta1c operator smtpc.log --rw-r----- 1 meta1s operator smtps.log - -To check whether an installation was successful, run - -# ./misc/sm.check.sh -P - -(in the build directory). Note: this script uses the same environment -variables as the installation script. - -Upgrading from earlier MeTA1 Versions - -Currently there is no support for automated upgrades. If you have an -earlier version of MeTA1 installed and want to upgrade, here are some tips -(note: all programs should be run from the build directory unless -mentioned otherwise): - - * To check whether an installation was successful, run - - # ./misc/sm.check.sh -P - - * To check whether the configuration file needs changes, run - - $ ./misc/smconf /etc/meta1/meta1.conf - - If the file is syntactically invalid for this version of MeTA1 the - program will show those errors. Use -h as argument to see the - available option, e.g., -u might be useful. - -Run-Time Configuration of MeTA1 - -Overview - -Configuration of MeTA1 can be done via command line parameters or via a -configuration file (the latter is preferred, the former offers only a -small subset of the available configuration options). If a configuration -file and command line options are specified, then the options are -currently processed in order, i.e., later settings override earlier ones -for the same options. Information about the former is available by -invoking a program with the option -h (MCP currently uses syslog(3) -instead of stderr), it will show the usage as well as the default values. -The syntax of the configuration files is specified in the following -sections. To actually use a configuration file, the option -f $CONFIGFILE -must be used, otherwise the programs use only the built-in default values, -but not a configuration file. Option '-V' can be used to show version -information, specifying '-V' multiple times shows more detail, e.g., -'-VVVVV' will show the configuration data including the default value for -(almost) every option, and '-VVVVVV' will also show all available flags. - -Some configuration options can be set via maps, these maps are: qmgr_conf -for QMGR (see Section 3.8.1) and access for SMTPS (indirectly via the -address resolver, see Section 3.9.3). - - -Configuration File Syntax - -The grammar for a MeTA1 configuration file is very simple: - -conf ::= entries - -entries ::= entry * - -entry ::= option | section - -section ::= keyword [name ] "{" entries "}" [";"] - -option ::= option-name "=" rhs - -rhs ::= value ";" | "{" value-list "}" [";"] - -A configuration file consists of entries, each entry is either an option -or a section. An option has a name, an equal sign, and a value terminated -by a semicolon or a (bracketed) list of values separated by comma^3.1. A -section consists of a keyword, an optional name, and a (bracketed) -sequence of entries. Keywords and options are not case sensitive. The -layout of a configuration file does not matter, i.e., indentation and line -breaks are irrelevant (in general, but see below for strings). - - -Configuration File Values - -Values in a configuration file are usually strings or numbers. If a string -is used, then it should be quoted, unless it contains no special -characters which are treated specially by the grammar. If a string is very -long it can be broken into substrings spread out over several lines (just -like strings in ANSI C), e.g., - - somemessage = "this is a very long string which is spread " - "out over several lines because otherwise it is too " - "hard too read."; - -Numeric values can have the usual prefixes (known from the programming -language C) of 0x for hexadecimal (with digits 0 to 9, A to F, and a to f) -and 0 for octal (with digits 0 to 7). Valid boolean values are 0, false, -off for false, and 1, true, on for true (case insensitive). - -In some cases it is possible to have units for values. Currently time and -size values make use of this feature. Valid time units are w for weeks, d -for days, h for hours, m for minutes, and s for seconds. Valid units for -size are B for bytes, KB for kilo bytes, MB for mega bytes, and GB for -giga bytes. It is allowed to specify a sequence of numbers and units, -e.g., 1h 5m 12s. Unless otherwise specified, the default units for times -and sizes in a configuration file are s and B, respectively; for those -values these units can be used. - - -Example Configuration File - -The installation script creates the file meta1.conf in the configuration -directory (/etc/meta1, see Section 2.4). Check the comments in the file -and edit it if required. A configuration file for meta1 contains several -sections: a global section which specifies the locations of sockets and -directories that are used by multiple components, and one section each for -QMGR, SMAR, SMTP server, and SMTP client. Other sections may define -services that are started by MCP, e.g., a local mailer. - -CDB_base_directory = "/var/spool/meta1/"; - -qmgr { - AQ_max_entries = 8192; - smtpc { initial_connections = 19; max_connections = 101; } - smtps { max_connections = 5; max_connection_rate=160; } - max_errors_per_DSN=16; - wait_for_server = 4; wait_for_client = 4; - start_action = wait; user = meta1q; - restart_dependencies = { smtps, smtpc, smar }; - path = "/usr/libexec/qmgr"; arguments = "qmgr -f /etc/meta1/meta1.conf"; -} - -smtps { flags = {8bitmime}; CDB_gid = 261; IO_timeout = 5m3s; - listen_socket { type = inet; port = 25; } - start_action = pass; pass_fd_socket = smtps/smtpsfd; - user = meta1s; path = /usr/libexec/smtps; - arguments = "smtps -f /etc/meta1/meta1.conf"; } - -smtpc { - Log_Level = 12; IO_timeout = 6m; wait_for_server = 4; - start_action = wait; user = meta1c; path = "/usr/libexec/smtpc"; - arguments = "smtpc -f /etc/meta1/meta1.conf"; } - -smar { - Log_Level = 12; - nameserver = {10.10.10.9, 127.0.0.1}; - DNS_timeout = 6; - start_action = wait; user = meta1m; restart_dependencies = { smtps, qmgr }; - path = "/usr/libexec/smar"; arguments = "smar -f /etc/meta1/meta1.conf"; -} - - -Common Global Configuration - -All of the following options have defaults and should only be changed if -necessary. - - 1. hostname: set the hostname to use for the various components. This can - be set if gethostbyname(3) does not return a valid (fully qualified) - hostname (format: string). - 2. CDB_base_directory: base directory of CDB (format: string); this - should either be empty (which is the default) or a path to a directory - including a trailing slash; the CDB library currently simply appends - the directory names (see Section 2.4.1) to it. It might be useful to - move some subdirectories to different disks (by creating (symbolic) - links (ln(1))) to spread the I/O load. - 3. SMAR_socket: socket created by the address resolver over which clients - (SMTPS, QMGR) can send requests (format: string). - 4. SMTPC_socket: communication socket between SMTPC and QMGR (format: - string). - 5. SMTPS_socket: communication socket between SMTPS and QMGR (format: - string). - -The sockets are currently Unix domain sockets only, hence the value is -simply the pathname of the socket. - - -Common Configuration Options - -There is currently one configuration option which is the same across all -modules but is not specified in the global section because it is specific -to the individual modules. - - 1. log: this is a section with the following options: - 1. facility: see syslog(3) for valid facilities, here are some valid - options provided the OS offers them: daemon, mail, auth, local0, - etc. - 2. ident: identification string for openlog(3), defaults to name of - the modules. It might be useful to chose other identifiers, e.g., - MeTA1 or MeTA1QMGR. - 3. options: options for openlog(3) (without the leading LOG_) as - provided by the OS, e.g., pid or ndelay. - - Example: - - qmgr { log { facility = daemon; ident=meta1-qmgr; } } - smtps { log { facility = mail; ident=meta1-MTA; } } - - Note: debug output is currently sent to stdout; syslog(3) is not used - for debugging. - -All modules have an option to set the amount of logging (log_level) that -should be done. The larger the value the more information is logged. For -normal operation a value of 9 is recommended. During testing values of 12 -to 14 are useful. - - -Pathnames for Files, Directories, and Maps - -Most names of files (including maps) and directories in the configuration -file have a default name (compiled into the binary) without an absolute -path, e.g., aliases.db. If a pathname is not explicitly set in the -configuration file or does not use a absolute path (i.e., begins with a -slash), then the default is relative to either - - 1. the configuration directory: maps and configuration files, e.g., - aliases.db and cert_file. - 2. the main queue directory: pathnames of sockets, and databases to store - envelope information (IBDB, DEFEDB) or message contents (CDB). - -The paths for files mentioned in case 1 are taken relative to the path of -the configuration file which is passed via the -f option to the various -modules. For example: if SMAR is started as - -/usr/libexec/smar -f /etc/meta1/meta1.conf - -then the pathname used for the aliases map is /etc/meta1/aliases.db. This -applies to the SMAR maps aliases, mailertable, and access (3.9.2), the -QMGR qmgr_conf map (3.8.1), and the STARTTLS related files and directories -used by the SMTP server (3.10) and client (3.11). - -The paths for files mentioned in case 2 are taken relative to the -execution directory. All MeTA1 modules should be started (via MCP) in the -main queue directory (default: /var/spool/meta1, see Section 2.4). - -See the various configuration options explained below how to override the -defaults. Note: relative pathnames specified in the configuration file are -(currently) always relative to the main queue directory. - - -Configuration for MCP - -Every section in a MeTA1 configuration file that refers to one of its four -main components (QMGR, SMTPS, SMTPC, and SMAR; see Section 1.1.1) has some -options that are relevant for MCP. These MCP options are: - - 1. start_action: one of nostartaccept, accept, pass, wait (required). - - 2. listen_socket: this is a subsection that specifies the socket on which - a process should listen. It must be specified for any start_action - except wait. There are two different socket types available: - - 1. type = inet - 1. port: port number on which process should listen (format: - numeric). - 2. address: IP address on which process should listen, if none is - specified the process listens on all local (IPv4) addresses - (format: IPv4 address). - - 2. type = unix - 1. path: pathname of Unix Domain socket on which process should - listen (format: string). - 2. umask: umask for socket (format: numeric). - 3. user: owner of socket (format: string). - 4. group: group of socket (format: string). - - 3. pass_fd_socket: pathname of Unix Domain socket to pass a file - descriptor to the process. - 4. user: user name to run process. - 5. group: group name to run process. - 6. restart_dependencies: list of other MeTA1 components that need to be - restarted when this one is restarted (or crashes). - 7. path: path to program to execute (required). - 8. arguments: arguments (argv), must start with name of program, see - execv(2) (required). - 9. pass_id: option to use to pass a unique, numeric identifier to the - spawned process via the command line. The option will be inserted as - first argument. Example: - - smtpc { pass_id = "-i"; min_processes = 4; max_processes = 4; - path = /usr/libexec/smtpc; arguments = "smtpc -f meta1.conf"; } - - will cause MCP to start four smtpc processes, each with the options -i - $ID$ -f meta1.conf where $ID$ is replaced with a unique identifier. - -Notes about start_action: - - * For start_action = pass the option pass_fd_socket must be specified; - in this case MCP binds to the specified socket (listen_socket) and - passes it via the Unix domain socket (pass_fd_socket) to the started - process. - * For start_action = nostartaccept MCP waits for incoming connections, - and then starts a process to handle a single connection. - * For start_action = accept MCP binds to the socket and then starts a - process to handle the connections without waiting for an actual - request. - * For start_action = wait MCP simply starts the requested number of - processes without passing them any open connections. This is intended - for processes that do not communicate with external clients. - -MCP is currently a generic control program that does not have any builtin -knowledge about the various MeTA1 modules. Hence the MCP options for each -MeTA1 component must be specified properly, there are no builtin defaults -that could be associated with the functionality of the various MeTA1 -modules. The default configuration file created by the installation -program contains the correct defaults. These should only be changed if -really necessary. - - -Configuration for QMGR - -The following configuration options are valid for QMGR: - - 1. AQ_max_entries: maximum number of entries in AQ (active queue) (unit: - entries). Note: this value must be larger than the largest number of - recipients accepted by a single transaction. - 2. conf: name of configuration map (including extension), see Section - 3.8.1 for details. See also Section 3.6 about relative pathnames. - 3. control_socket: specify pathname of ``control'' socket (for querying - and making requests). This socket can be used by the query/control - program qmgrctl, see Section 4.6.3. - - 4. subsection DEFEDB: - 1. base_directory: home directory for DEFEDB. - 2. log_directory: log directory for DEFEDB. For better performance, - this directory can be set to point to a different disk than the - base directory of DEFEDB. - - 5. subsection DSN_handling: - 1. merge_delay_max: maximum time to wait for merging multiple DSNs - into one (unit: s). - 2. flags: configuration flags: - 1. header_only: include only the headers in a DSN; by default the - first bounce includes the entire message and subsequent ones - include only the headers. - 2. MIME_Format: use MIME to structure a DSN. Note: this is not - (yet) a DSN in the format specified by RFC 3464 [MV03]. - 3. max_errors_per_DSN: maximum number of error messages (failed - recipients) in a bounce (DSN) (unit: entries). - - 6. double_bounce_address: RFC 2821 address for double bounces; defaults - to . - 7. subsection IBDB: - 1. max_commit_delay: maximum time between commits to IBDB (unit: $\ - mu$s) - 2. size: maximum size of each IBDB file (unit: B). - 3. max_open_TAs: maximum number of open transactions in IBDB before a - commit is performed (unit: entries). - - Note: the configuration file offers no way to specify a base directory - for IBDB, however, the directory can be easily moved elsewhere and a - (symbolic) link (ln(1)) can be added. - - 8. subsection IQDB: - 1. max_cache_entries: maximum number of entries in IQDB cache (unit: - entries). This must be larger than the sum of all recipients in - open transactions. - 2. hash_table_entries: size of hash table for IQDB (unit: entries). - This must be larger than max_cache_entries. - - 9. log_level: logging level. -10. min_disk_space: minimum amount of free disk space (unit: KB). This - value should be significantly larger than the maximum size of a - message to be accepted by the SMTP server, it should be as large as - the maximum message size multiplied by the maximum number of incoming - connections. -11. OCC_max_entries: size of outgoing (SMTPC) connection cache (unit: - entries). This should be large enough to keep track of outgoing - connections over a time span that is at least as long as the maximum - retry time. -12. ok_disk_space: amount of free disk space at which normal operation - continues (unit: KB). Must be larger than min_disk_space. -13. queue_return_timeout: maximum time in queue (unit: s). -14. queue_delay_timeout: send delay warning (``delayed DSN'') if the mail - is still in the queue after at least this duration (unit: s). To turn - off delayed DSNs set this to a value bigger than queue_return_timeout. - Note: based on the retry schedule the delayed DSN might be sent later - than the option specifies. -15. retry_max_delay: maximum time for retrying a delivery (unit: s). -16. retry_min_delay: minimum time for retrying a delivery (unit: s). - -17. subsection smtpc: - 1. initial_connections: maximum initial number of outgoing - connections to a single host (unit: entries). The sliding window - for the slow start algorithm (see Section 3.8.1) is initialized - with this value. - 2. max_connections: maximum number of outgoing connections to a - single host (unit: entries). - 3. lmtp_max_rcpts_per_transaction: maximum number of recipients per - transaction for mail sent via LMTP (unit: entries). - 4. smtp_max_rcpts_per_transaction: maximum number of recipients per - transaction for mail sent via (E)SMTP (unit: entries). - - 5. flags: configuration flags: - 1. lookup_rcpt_conf: Look up recipient configuration data (see - Section 3.11.1) in the access map (see Section 3.9.3) - - 2. lookup_session_conf: Look up session configuration data (see - Section 3.11.1) in the configuration map (see item 2). - - 6. rcpt_conf_lookup_flags: If recipient configuration data (see item - 17(e)i) is looked up in the access map, then these flags determine - which kind of lookups should be performed. - - 1. full_adress: use the full address as key. - 2. detail_plus: lookup also ``user++@subdomain''. - 3. detail_star: lookup also ``user+*@subdomain''. - 4. star: lookup also ``user*@subdomain''. - 5. domain: lookup domain part. - 6. dotsubdomain: iterate through subdomains. - 7. dot: lookup also ``.''. - - The default is to perform all lookups. - -18. subsection smtps: - 1. max_connection_rate: maximum incoming connection rate from a - single host (unit: connections/60s). - 2. max_connections: maximum number of open incoming connection from a - single host (unit: entries). - -19. wait_for_client: maximum amount of time to wait for a client to become - available (unit: s) -20. wait_for_server: maximum amount of time to wait for a server to become - available (unit: s) - - -Configuration Map for QMGR - -QMGR implements a ``slow start'' algorithm to control the number of -concurrent connections to one IP address. Initially, it will at most -create a (small) number of open connections up to a specified initial -limit. For each successful delivery, the allowed number is increased up to -specified maximum limit. - -For incoming connections, QMGR establishes two limits: the connection rate -and the number of open connections. - -The Berkeley DB hash map qmgr_conf.db (the file should be owned by meta1q) -can have the following entries: - - 1. oci: this key specifies the initial number of concurrent outgoing - connection to an IP address. - 2. ocm: this key specifies the maximum number of concurrent outgoing - connection to an IP address. - 3. octo: specify the timeout for an entry in the outgoing connection - cache. - 4. icr: this key specifies the maximum rate for incoming connections (per - 60s). - 5. icm: this key specifies the maximum number of concurrently open - incoming sessions. - 6. smtpc_session_conf: see Section 3.11.1 - -oci:, ocm:, icr:, icm:, and smtpc_session_conf: take an IP address/net as -parameter such that the limits can be imposed per IP address/net. For -example: - -oci:127.0.0.1 5 -ocm:127.0.0.1 10 -oci:10 10 -ocm:10 50 -oci: 1 -ocm: 4 -icr:10 5 -icr:127.0.0.1 100 -icm:127.0.0.1 120 - -Note, however, that the limits apply only to single IP addresses, they are -not aggregated for nets. That is, for the example every single host in the -IP net 10.x.y.z can have a maximum incoming connection rate of 5 messages -per minute. - -The default values for these configuration options are set in the binary -and can be changed via command line options or the configuration file (see -Section 3.8): - - 1. -C n maximum number of concurrent connections to one IP address - [default: 100] - 2. -c n initial number of concurrent connections to one IP address - [default: 10] - 3. -O R=n maximum connection rate per 60s (SMTPS) [default: 100] - 4. -O O=n maximum number of open connections (SMTPS) [default: 100] - - -Configuration for SMAR - - -Declaring Maps for SMAR - -In general, maps must be declared before they can get used. Each map -declaration in a configuration file is a named subsection - the name is -used for later references - map in the smar section with the following -options: - - 1. type: type of the map; currently one of hash (Berkeley DB hash), cdb - (tinycdb), sequence, socket, and passwd. - 2. file: the filename of the db file (including the extension) (for type - hash, cdb). - 3. mapname: name of the map used in the protocol (type socket only). - 4. address: IPv4 address of inet socket. (type socket only). - 5. path: the pathname of the Unix domain socket (for type socket). - 6. port: port for inet socket (type socket only). - 7. maps: list of map names to use in the map (type sequence only). - -Note: for socket maps either a Unix domain socket (path) or an inet socket -(address and port) must be specified. - -Example: - -map localusers { type = hash; file = "/etc/meta1/localusr.db"; } -map otherusers { type = cdb; file = "/etc/meta1/otherusr.cdb"; } -map password { type = passwd; } -map seq1 { type = sequence; maps = { localusers, otherusers }; } -map seq2 { type = sequence; maps = { password, otherusers }; } - - -Configuration Options for SMAR - -The following configuration options are valid for SMAR: - - 1. access_map: this is a subsection that specifies the access control - map. See Section 3.9.3 for details. - - Note: only one of file (1a) and name (1b) must be specified. - - 1. file: filename of access map (including extension) [default: - access.db]. - 2. name: name of access map . This can be used if a different map - type should be used, in which case the map must be declared as - explained in Section 3.9.1. - - 2. address_delimiter: list of delimiters (specified as string) for - address extensions in local part, [default: "+"]. Note: if - address_delimiter has more than one character, the first one that is - found in the local part of an address is used as delimiter in map - lookups (see Section 3.12). For example: if the following option is - used in the configuration file: - - address_delimiter = "/_-"; - - then for the address ``'', the delimiter - for map lookups is ``/'' and the address detail is ``ext-list'', while - for the address ``'', the delimiter for map - lookups is ``-'' and the address detail is ``ext_list''. - - 3. aliases: this is a subsection that specifies the parameters for - aliases. - - Note: only one of file (3a) and name (3b) must be specified. - - 1. file: filename of aliases map (including extension) [default: - aliases.db]. - 2. name: name of aliases map . This can be used if a different map - type should be used, in which case the map must be declared as - explained in Section 3.9.1. - 3. flags: - 1. localpart: the aliases map contains only localparts of - addresses and those are only looked up for local addresses. - 2. local_domains: the aliases map contains fully qualified - addresses which are only looked up for local addresses. This - can be used similar to virtual users in sendmail 8, e.g., - - vuser1@virt1.tld: user1 - - vuser2@virt1.tld: user2 - - vuser3@virt2.tld: user3 - - 3. all_domains: the aliases map contains fully qualified - addresses which are looked up for all domains. - 4. implicitly_match_detail: the items are looked up according to - the algorithm specified in Section 3.12.1. and additionally - +detail is implicitly matched when the pattern is - ``user@hostname''. That is, it overrides the default matching - explained in case 1e in Section 3.12.1. - 5. replace_macros: replace macros in the RHS of the map entries - by the appropriate value, see Section 3.12.3. - 6. preserve_domain: if the RHS of an entry is an unqualified - address, do not append the local hostname to it but the domain - of the original address, i.e., preserve the original domain. - 4. DNS: this subsection contains DNS related options. - 1. nameservers: list of up to four IPv4 addresses^3.2of nameservers. - Note: it is important that all of these nameserves work properly. - Currently they are used ``round robin'' without excluding - nameservers that do not answer^3.3. - 2. retries: maximum number of retries. A value of 0 means one query - only, i.e., no retry. - 3. timeout: the default timeout for a single DNS query (unit: s). - Notes: - o the timeout for a DNS request is the product of the number of - tries and the individual timeout, i.e., (retries + 1) * - timeout. - o this value is only the default timeout which can be overridden - by an application. For example, QMGR dynamically increases the - timeout for addresses which did not resolve in earlier tries. - 4. flags: The flag use_resolvconf causes the list of nameservers (see - 4a) to be read from /etc/resolv.conf. This flag is set by default - unless the nameservers option is used. Note: the list of - nameservers is not updated when /etc/resolv.conf is changed, smar - needs to be restarted to achieve that. - - More flags can be found in Section 8.4. - - 5. dnsbl: specify a DNS based blacklist^3.4. This section can be - specified multiple times^3.5; it has the following required options: - + domain: specify the domain to use for DNS lookups, e.g., - dnsbl.tld. - + tag: specify the tag to use for lookups in the access map (which - must be enabled, see Section 3.10, 3b). - The client IPv4 address A.B.C.D is looked up via DNS as D.C.B.A.domain - querying for an A record. If an A record W.X.Y.Z is found, then it is - looked up in the access map as tag:W.X.Y.Z. for temporary and - permanent DNS lookup failures the entries that will be checked in the - access map are tag:temp and tag:perm, respectively. - - Notes: - + DNS lookups in blacklists can be disabled via entries in the - access map using the tag cltaddr, see Section 3.9.3. - + Some DNS blacklists return multiple A records. For those the A - records are checked (in the order returned by the DNS server) - until an access map entry is found. This is an intermediate - solution as it may cause random results if multiple access map - entries for a DNS blacklist exist. However, as long as all of them - have the same return code type (i.e., temporary or permanent), - this behavior is sufficient. - + currently a colon is added as delimiter after tag, this may be - removed in later versions to allow for more flexibility; e.g., the - configuration option itself can include a delimiter. - - The access map entry should have one of the usual rejection RHSs as - explained in 3.9.3. Example: configuration file: - - smar { dnsbl { domain = dnsbl.tld; tag = dnsbltld; } } - - access map: - - dnsbltld:127.0.0.1 error:550 5.7.1 listed at dnsbl.tld as open relay - dnsbltld:127.0.0.2 error:550 5.7.1 listed at dnsbl.tld as spam source - dnsbltld:127.0.0.9 error:451 4.7.1 listed at dnsbl.tld as suspicious - dnsbltld:temp error:451 4.7.1 temporary lookup failure at dnsbl.tld - - If multiple DNS based blacklists are specified, the DNS queries are - made concurrently but the lookups in the access map are performed in - the order in which the blacklists are given; the first successful - lookup is used as result, no further priorization is performed. - - 6. greylisting: specify greylisting options, see Section 3.9.4 for - details. - 1. grey_wait: how long before greylisted can be confirmed. - 2. grey_expire: timeout for greylisted entries (did not confirm - within that time). - 3. white_expire: expire whitelisted entries after this time if - necessary. - 4. white_timeout: force whitelisted entries to reconfirm after this - time. - 5. main_DB_name: name of main database (including .db extension). - 6. secondary_DB_name: name of secondary database (including .db - extension). - 7. expire_limit: try to expire entries when this limit is reached. - 8. netmask: by default the entire IPv4 address is used as a key, - however, by specifying a netmask, e.g., 0xFFFFFF00, the least - significant bits can be cut off. This can be used to deal with - server farms, see Section 3.9.4, e.g., if those are in the same - class C subnet. - - 7. local_user_map: this is a subsection that specifies a map of valid - local addresses. - 1. name: Name of the map of valid local addresses; the map must have - been declared as explained in Section 3.9.1. - 2. flags: - i. implicitly_match_detail: +detail is implicitly matched when - the pattern is ``user@hostname''. That is, it overrides the - default matching explained in case 1e in Section 3.12.1. - - 8. log_level: logging level. - - 9. mailertable: this is a subsection that specifies a mailertable, - currently you can specify exactly one of the following two options: - 1. file: filename of mailertable [default: mt]. In this case a plain - text file is read during startup and placed in an internal hash - table. - 2. name: name of a mailertable map that has been declared before (see - Section 3.9.1). - - 3. flags: these flags can be used to select a subset of the matching - described in Section 3.12.1. - 1. full_adress: use the full address as key. - 2. detail_plus: lookup also ``user++@subdomain''. - 3. detail_star: lookup also ``user+*@subdomain''. - 4. star: lookup also ``user*@subdomain''. - 5. domain: lookup domain part. - 6. dotsubdomain: iterate through subdomains. - 7. dot: lookup also ``.''. - - The default is domain, dotsubdomain, dot. - - The format of entries in the map is explained in Section 3.9.3. Note: - reloading mailertable (Section 4.7) while SMAR is running can be done - only if it is declared as Berkeley DB (case 9b with the proper map) - - -Configuration Maps for SMAR - -SMAR requires a mailertable, and it can make use of an alias map as well -as an access map, all of which are described in the subsequent sections. - - -Access Map - -To activate the access map the flag access (see Section 3.10, item 3b) (or -the option -a) must be given to the SMTP servers. All entries consist of a -left hand side (LHS, key) which in turn has a tag and a (partial) address -and a right hand side (RHS, value). Valid tags are: - -Tag refers to - -from: envelope sender address (MAIL) - -to: envelope recipient address (RCPT) - -cltaddr: client IPv4 address - -cltname: client host name - -cltresolve: result of forward and reverse client lookup - -mxbadip: IPv4 addresses that are not allowed for MX - A - records - -certissuer: DN of CA cert that signed that presented cert - -certsubject: DN of presented cert - -protectedrcpt: restrictions for recipient address (see Section - 3.10.3) - -smtps_session_conf: configuration options for a session in the SMTP - server (see Section 3.10.1) - -smtpc_rcpt_conf: configuration options for recipient in the SMTP - client (see Section 3.11.1) - -Valid addresses for from: and to: are RFC 2821 addresses without the angle -backets (localpart@domain) as well as partial addresses in the form -localpart and @domain, i.e., domains must be preceeded with an at (@) -sign. Valid addresses for cltaddr: and mxbadip: are IPv4 addresses and -(sub)nets, and for cltname: host names. The client host name is determined -by performing a reverse lookup (PTR record) for its IP address. The -resulting names are looked up as A records. Only if one of the A records -matches the client IP address, the host name is set. Note: the host name -has a trailing dot after DNS resolution, this dot must be included in the -entry. The result of these lookups can be used for cltresolve: where the -following keys are valid: - -ok reverse and forward lookup match - -no reverse and forward lookup do not match - -tempptr reverse lookup (PTR) caused a temporary error - -tempa forward lookup (A) caused a temporary error - -Valid values for RHS are - -relay allow relaying; currently only for to:, cltaddr:, - - cltname:, certissuer:, and certsubject: - -ok accept command - -error:XYZ A.B.C.D return an error consisting of SMTP reply code XYZ, -text - - enhanced status code A.B.C.D, and text, - - i.e., the part after error: is returned to the - client. - -reject same as error:550 5.7.0 Rejected. - -discard accept command but silently discard its effects. - -cont stop current check (e.g., map lookup), but continue - others. - -Some tags may allow for other RHS values, these are explained when those -tags are discussed in more detail. - -Optionally a RHS can be preceeded by the modifier quick:. For an error: -entry it causes an immediate rejection when the entry matches. Otherwise -rejections can be delayed to the RCPT stage - if SMTPS is configured -appropriately, see Section 3.10, item 3c - and can be overridden using the -modifier quick: together with ok or relay in the access map for the -recipient address with the to: tag. Using the modifier quick: together -with relay for an entry with the cltaddr: tag causes it to override all -other access map checks. quick:ok for an entry with the cltaddr: tag -causes it to override other access map checks unless they are necessary to -allow relaying. - -Domain names (@domain) must have an exact match, subdomain matching can be -specified with a leading dot, i.e., @.domain, see Section 3.12.1. - -Examples: - -cltresolve:tempptr error:451 4.7.1 reverse lookup failed - -mxbadip:127.0.0.1 error:551 5.7.1 Bad IP address 127.0.0.1 in MX/A - list - -mxbadip:192.168.255.255 error:551 5.7.1 Bad IP address 192.168.255.255 in - MX/A list - -from:@spammer.domain error:551 5.7.1 No spammers - -from:@.spammer.domain error:551 5.7.1 No spammers in subdomains either - -to:root error:551 5.7.1 No mail to root - -to:abuse quick:ok - -cltaddr:10 error:551 5.7.1 No direct mail from 10.x.y.z - -cltname:spammer.domain. quick:error:551 5.7.1 No mail from spammers - -to:@primary.domain relay - -cltaddr:10 relay - -cltaddr:127.0.0.1 quick:relay - - -Discard - -The effect of discard depends on the protocol stage in which it is -returned. If it is returned for a session, e.g., when a client connects, -all transactions in the session are discarded. If it is returned for MAIL -only that transaction is discarded. If it is returned for RCPT only that -recipient is discarded; however, if no valid recipients are left, the -entire transaction is discarded. Moreover, if quick:discard is returned -for one recipient the entire transaction is discarded too. - - -Mailertable - -The address resolver implements an asynchronous DNS resolver and by -default it uses a file called mt (mailertable) (see Section 3.9.2, item 9) -which consists of domain parts of e-mail addresses and corresponding IP -addresses (in square brackets) or domain/host names. An entry consists (as -usual in a map) of a LHS and a RHS; in the case of a flat text file, i.e., -case 9a of Section 3.9.2, those are separated by one or more whitespace -characters. - -LHS :: [ local "@" ] [ "." ] hostname | "." - = - -RHS :: [[ port "^" ] ["esmtp:"]] hosts | "lmtp:" | port " - = ^"lmtp:" hosts - -port :: integer - = - -hosts :: hostname | iplist - = - -iplist :: "[" IPv4-address "]" [ " " iplist ] - = - -The key (LHS) is an address (without angle brackets), a hostname, or a dot -(denoting the default entry), the value (RHS) consists of an optional port -number, an optional (esmtp) mailer and a hostname or a list of IPv4 -addreses (in square brackets) which are separated by spaces. If LMTP -should be used, then the lmtp mailer must be selected. There are two -cases: just lmtp: by itself means the delivery agent will use the Unix -domain socket specified in the configuration file (see Section 3.11, item -2), if an inet socket should be used then a port and a host must be -specified. A hostname is subject to MX lookups. - -Example: - -localhost lmtp: - -SPAM.FILTER.DOMAIN 2525^esmtp:[127.0.0.1] - -LMTPHOST.MY.DOMAIN 525^lmtp:[10.11.12.13] - -MY.DOMAIN esmtp:[10.1.2.3] - -ANOTHER.DOMAIN esmtp:MTA.SERVER - -.TLD esmtp:GATE.WAY - -. esmtp:SMART.HOST - -Note: currently this file must exist, even if there are no entries (it is -created during installation). - - -Aliases - -To specify aliases for local addresses the map aliases.db (Section 3.9.2, -item 3a) is used. The key in the map must be - - * the local part of a valid (local) e-mail address, - * or a complete local e-mail address, - * or any e-mail address, - -based on the flags of the aliases option (see Section 3.9.2, 3c). The -value (RHS) for an alias entry is a list of one or more RFC 2821 addresses -(including the angle brackets) separated by spaces (not commas). If the -RHS has only a single address which does not start with an angle bracket, -then it is converted into an RFC 2821 address by SMAR, i.e., SMAR will -append the hostname of the machine and put angle brackets around the -string. Example: - -myalias: localuser - -mylist: - -owner-mylist: someuser - -For mailing lists, the owner- notation is supported, i.e., if there are -aliases list and owner-list then mail sent to list will use owner-list as -envelope sender address; the original domain will be preserved. - -Example for the flag local_domains (see 3.9.2, 3(c)ii). Let two domains be -local, i.e., in mailertable: - -first.dom lmtp: - -second.dom lmtp: - -and these entries be in aliases: - -myalias@first.dom: user1 - -another@second.dom: user2 - -Then mail to and would be -rejected while mail to or would -be accepted. - -Aliases can be nested (currently up to 5 levels, see smar/rcpts.c). - - -Greylisting - -MeTA1 supports a very simple form of greylisting [Hara] which only uses -the client IP address as key [Posa] instead of a tuple consisting of -client IP address, envelope sender, and envelope recipient. The idea -behind greylisting is simple: do not accept mail from an unknown source on -the first connection, but reject it with a temporary error. Any MTA that -conforms to RFC 2821 [Kle01] will try to send the mail later on, however, -spamming systems often do not do that. An IP address can be in three -different states: unknown: the client has not connected before or the -entry is expired from the database, greylisted: the client has connected -before but it did not yet connect again within the configured time -interval, whitelisted: the client has connected before and it connected -again within the configured time interval. The time interval is specified -by its lower limit grey_wait and its upper limit grey_expire. A lower -limit is used to prevent system from getting accepted that just send a -single message within a few seconds again and again. The upper limit is -used to avoid filling up the database. If an entry has made it to the -whitelisted state, it will stay there for (at least) up to the timeout -specified by white_expire. The greylisting algorithm implemented in MeTA1 -uses another timeout white_timeout after which a whitelisted entry is -considered stale and must go through the greylisting stages again, i.e., -it is considered to be in state unknown. Each time a mail is sent from a -whitelisted host, the entry is updated, to avoid that systems which -regularly sent mail become greylisted again. - -Greylisting is performed at the RCPT stage of the SMTP dialogue. It is -only done when a valid recipient is specified, i.e., all other checks must -have been successful. Hence clients that do not try to send mail or just -try invalid recipient addresses will not be added to the greylisting -database. If a transaction is subject to greylisting then the session is -aborted with an 421 error. If a server uses callbacks to verify the sender -address, then the option delay_greylisting_error_until_DATA (see Section -3.10, item 3d) is useful to avoid unnecessary delays. Here is an example: -host A is the main MX server for domain example.com and it uses -greylisting, host B is the main MX server for domain example.net and it -uses sender callbacks. If a mail is sent to host B for -with the sender address then host B will connect to -host A to test whether is a valid recipient. However, -if host A does not have host B in its whitelist, it will return a 421 -error after the RCPT To: command, which (depending on -the implementation of the sender callback) will cause host B to -temporarily reject the mail for . By specifying the -option delay_greylisting_error_until_DATA on host A the RCPT command will -succeed and the original mail to will go through -without delay. - -The greylisting implementation uses two persistent databases (specified by -main_DB_name and secondary_DB_name), where the second DB is just a -secondary index (by expiration time) for the main DB. These databases -should be on a filesystem with sufficient free disk space depending on how -many connections from different clients the MTA receives. Entries are only -removed from the DB if there are more than expire_limit elements. However, -if none of the entries are expired yet, then the number of elements can -exceed that limit. - - -Greylisting: Whitelisting - -Greylisting can be disabled for selected hosts by adding them to the -access map (see Section 3.9.3), e.g., - -cltaddr:10 relay - -cltaddr:127.0.0.1 quick:relay - - -Possible Problems with Greylisting - -Some legitimate mailers do not behave properly and will not retry a mail -that had a temporary error. This can cause mail loss in various -situations, e.g., because the receiving system is currently out of some -resources. However, to minimize the impact of greylisting on these -misbehaving mailers it might be useful to explicitly whitelist them as: - -cltaddr:12.107.209.244 ok - -cltaddr:64.12.137 ok - -A list of such broken mailers can be found at http://cvs.puremagic.com/ -viewcvs/greylisting/schema/whitelist_ip.txt [Harb]. A related problem are -server farms where a mail might be resent from a different IP address. -These should probably be whitelisted too; some of these can be found at -the URL given before. However, entries in that file which have the comment -``unique sender per attempt'' do not need to be whitelisted as this -implementation does not use the sender address. - -Note: if a client authenticates via STARTTLS or AUTH such that relaying is -allowed then greylisting is disabled for that client. - - -Configuration for SMTP Server - -The following configuration options are valid for SMTPS: - - 1. auth: this is a subsection that specifies the parameters for AUTH - support. It is only available if the system has been configured with - the option --enable-SASL, see Section 2.2.1. - 1. flags: flags for SMTP AUTH - - See the Cyrus SASL documentation for the meaning of these flags: - noplaintext, noactive, nodictionary, forward_secrecy, noanonymous, - pass_credentials, mutual_auth. - - 2. trusted_mechanisms: list of SASL mechanisms for which relaying is - allowed if a client successfully authenticated using one of those - - Note: the name for the Cyrus-SASL configuration file is currently - meta1.conf. That file can be used to adjust the list of mechanisms - (option mech_list) that should be advertised (besides many other - things), hence this option is not in the SMTP server itself. - - 2. CDB_gid: (numeric) group id for CDB files, i.e., the group id of - meta1c, see Section 2.4.1. - 3. flags: - 1. 8bitmime: offer 8BITMIME: MeTA1 is 8 bit transparent, but it does - not perform any conversion, so this option should only be used if - all communication partners can deal with 8 bit data. - 2. access: use access map (in SMAR). Note: currently this flag is - required to perform a reverse lookup for a client IP address to - get the hostname of the client which then can be used for logging - and the Received: header. - 3. delay_checks: delay acceptance check until RCPT stage (unless - explicitly overridden, see Section 3.9.3). - 4. delay_greylisting_error_until_DATA: if greylisting (3e) is enabled - then wait until the DATA command to return an error; see Section - 3.9.4 for details. - 5. greylisting: enable greylisting (which must also be enabled in - SMAR, see Section 3.9.2 item 6), see Section 3.9.4 for details. - 6. lmtp_does_not_imply_relaying: even if a domain in the mailertable - has lmtp: as RHS do not implicitly allow relaying to it, i.e., do - not consider the domain as ``local'' with respect to relaying. - This is useful for an MSA to avoid external mail to local domains - without authentication. - 7. soft_bounce: change permanent (5xy) SMTP error replies into - temporary (4xy) errors. This is a useful feature for testing to - avoid bounces due to misconfigurations. - 8. require_EHLO_before_MAIL: require EHLO (or HELO) before a MAIL - command. - 9. strict_EHLO_checks: perform a strict syntax check on the argument - for EHLO (or HELO). - - 10. xverp: offer XVERP extension to turn on VERP [Ber97] support for a - transaction. This is a parameter for the MAIL command, e.g. - - MAIL From: XVERP - 11. allow_data_before_greeting: allow a client to send data before the - initial 220 greeting. - - 12. prdr: PRDR is an SMTP extension [Hal07] to return individual RCPT - status after the end of data (similar to LMTP). This feature is - turned on if a policy milter is configured (see item 17). - - 13. lookup_session_conf: Look up session configuration data (see - Section 3.10.1) in the access map (which must be activated, see 3b - ). - - 4. id: unique identifier for SMTP server (0); see Section 3.10.2. - 5. io_timeout: timeout for SMTP operations. - 6. max_threads: maximum number of threads. - 7. max_bad_commands_per_session: maximum number of bad, i.e., unknown, - SMTP commands per session accepted by server. After this limit is - reached the connection is terminated with an 421 error. - 8. max_invalid_addresses_per_session maximum number of invalid, e.g., - unknown, RCPT addresses per session accepted by server. After this - limit is reached the connection is terminated with an 421 error. - 9. max_nop_commands_between_transactions: maximum number of NOOP, RSET, - and related SMTP commands between two successful transactions accepted - by server. After this limit is reached the connection is terminated - with an 421 error. -10. max_bad_commands_per_transaction: maximum number of bad, i.e., - unknown, SMTP commands per transaction accepted by server. After this - limit is reached the connection is terminated with an 421 error. -11. max_nop_commands_in_transaction: maximum number of NOOP and related - SMTP commands in a single transaction accepted by server. After this - limit is reached the connection is terminated with an 421 error. -12. max_invalid_addresses_per_transaction maximum number of invalid, e.g., - unknown, RCPT addresses per transaction accepted by server. After this - limit is reached the connection is terminated with an 421 error. -13. max_recipients_per_session: maximum number of recipients per session. -14. max_recipients_per_transaction: maximum number of recipients per - transaction. -15. max_hops: maximum number of hops (Received: headers). If this value is - exceeded the incoming mail is rejected because it is considered a - possible mail loop. -16. max_message_size: maximum message size (unit: KB). -17. policy_milter: this is a subsection that specifies the parameters for - pmilter support (see Section 5). It is only available if it has been - enabled during configure (--enable-pmilter, see Section 2.2.1). - 1. socket: this is a subsection that specifies the socket to - communicate with policy milter. The type (option type) of the - socket must be either inet or unix. - 1. type = inet - 1. port: port number for connection. - 2. address: IP address for connection. - - 2. type = unix - A. path: pathname of Unix Domain socket. - - 2. timeout: maximum amount of time to wait for a reply from a policy - milter. - 3. flags: policy milter flags. If the connection to pmilter fails - then SMTPS will ignore pmilter by default. This behavior can be - changed by setting one of following two flags: - 1. abort: if the connection to pmilter fails then abort the - current session with a 421 error. - 2. accept_but_reconnect: if the connection to pmilter fails then - continue the current session but try to reconnect for the next - session. - -18. processes: number of processes to start. -19. protected_recipients: this is a subsection which provides a few simple - options to protect recipients by restricting who can send mail to - them. - 1. allow_by: this is a required subsection which has two possible - flags (at least one must be specified). - 1. sender: allow sending mail based on the envelope sender (MAIL) - address. Even though this address can be forged it provides - some basic protection. - 2. client_ip: allow sending mail based on the client IP address. - - 2. match_type: this specifies what type of matching should be done. - By default, exact matches are required. Alternatively, one of the - following two options can be selected: - 1. generic_lookup: the items are looked up according to the - algorithm specified in Section 3.12.1. - 2. implicitly_match_detail: the items are looked up according to - the algorithm specified in Section 3.12.1. and additionally - +detail is implicitly matched when the pattern is - ``user@hostname''. That is, it overrides the default matching - explained in case 1e in Section 3.12.1. - - See Section 3.10.3 for details. -20. max_transactions: maximum number of transactions per session. - -21. tls: this is a subsection that specifies the parameters for STARTTLS - support. It is only available if the system been configured with the - option --enable-TLS, see Section 2.2.1. See Section 11.1 for some - background information about these options. - - 1. cache_size: size of TLS session session cache (0: disable cache). - 2. cache_timeout: timeout for entries in TLS session session cache. - 3. cert_file: file with certificate in PEM format. - 4. key_file: file with private key for certificate in PEM format. - 5. CAcert_file: file with CA certificate in PEM format. - 6. CAcert_directory: directory with (symbolic links for) CA - certificates in PEM format. - - 7. flags: some flags are available to influence the behavior of the - SMTP server with respect to STARTTLS. - 1. allow_relaying_if_verified: if the client presented a - certificate that can be verified by the CA certificates that - are available to the server (see above: CAcert_file and - CAcert_directory), then relaying is allowed for the SMTP - session. - - 2. check_access_map_for_relaying: if this flag is set then the - access map (which must be activated, see 3b) is checked to see - whether relaying should be allowed for a client which - presented a certificate that has been verified (see above). - For this purpose, the DN of the cert issuer is looked up in - the access map using the tag certissuer:. If the resulting - value is relay, relaying is allowed. If it is cont, the DN of - the cert subject is looked up next in the access map using the - tag certsubject:. If the value is relay, relaying is allowed; - every other value is currently ignored. - - To avoid problems with the DN names in map lookups, they are - modified as follows: each non-printable character and the - characters '<', '>', '(', ')', '"', '+', ' ' are replaced by - their hexadecimal ASCII value with a leading '+'. For example: - - /C=US/ST=California/O=endmail.org/OU=private/CN= - Darth Mail (Cert)/emailAddress=darth+cert@endmail.org - - is encoded as: - - /C=US/ST=California/O=endmail.org/OU=private/CN= - Darth+20Mail+20+28Cert+29/emailAddress= - darth+2Bcert@endmail.org - - Examples: - - To allow relaying for everyone who can present a cert signed - by - - /C=US/ST=California/O=endmail.org/OU=private/CN= - Darth+20Mail+20+28Cert+29/emailAddress= - darth+2Bcert@endmail.org - - simply use: - - certissuer:/C=US/ST=California/O=endmail.org/OU=private - /CN= - - Darth+20Mail+20+28Cert+29/emailAddress= relay - darth+2Bcert@endmail.org - - To allow relaying only for a subset of machines that have a - cert signed by - - /C=US/ST=California/O=endmail.org/OU=private/CN= - Darth+20Mail+20+28Cert+29/emailAddress= - darth+2Bcert@endmail.org - - use: - - certissuer:/C=US/ST=California/O=endmail.org/OU=private - /CN= - - Darth+20Mail+20+28Cert+29/emailAddress= cont - darth+2Bcert@endmail.org - - CertSubject:/C=US/ST=California/O=endmail.org/OU= - private/CN= - - DeathStar/emailAddress=deathstar@endmail.org relay - - Notes: - # line breaks have been inserted after CN= for readability, - each tagged entry must be one (long) line in the access - map. - # if OpenSSL 0.9.6 is used then the emailAddress= part of a - DN is replaced by Email=. - - 8. requirements_violation: This option decides how to (globally) - handle TLS requirement violations (see Section 3.10.1). Possible - values are: permfail: generate permanent failure, tempfail: - generate temporary failure, abort: abort session. These option - take effect when a MAIL command is issued by the client. - -22. session_features: This section can be used to define classes of - features for an SMTP server session which then can be referenced via - the access map. Available flags are a subset of those listed in item 3 - : starttls, auth, delay_checks, allow_data_before_greeting, - require_EHLO_before_MAIL, strict_EHLO_checks, check_EHLO. - - Example: to turn off STARTTLS for some clients, declare a notls class - in the configuration file: - - session_features notls { flags = { -starttls }} - - and reference it in the access map for those clients: - - smtps_session_conf:217.126.135.148 session_feature=notls; - - - -SMTP Server Session Configuration - -Some options can be set via the access map (see Section 3.9.3, tag -smtps_session_conf) because they apply to a session, not globally. -Currently available are: STARTTLS requirements (tls_requirements) (see -Section 3.13) and session_features (see Section 3.10, item 22). - - -Multiple SMTP Servers with different Configurations - -The normal way to run multiple SMTP servers is to let MCP start several -SMTP servers. Each SMTP server must given a unique identifier (see Section -3.10, item 4) and each SMTP server section in meta1.conf must have a -unique name (e.g., MTA and MSA), which is passed via the option -N name to -smtps. Example: meta1.conf: - -smtps MTA { - id = 0; - listen_socket { type=inet; port = 25; } - start_action = pass; pass_fd_socket = smtps/mtafd; - user = meta1s; - path = /usr/libexec/smtps; - arguments = "smtps -N MTA -f /etc/meta1/meta1.conf"; - log { facility = mail; ident=meta1-MTA; } -} - -smtps MSA { - id = 1; - listen_socket { type=inet; port = 587; } - start_action = pass; pass_fd_socket = smtps/msafd; - user = meta1s; - path = /usr/libexec/smtps; - arguments = "smtps -N MSA -f /etc/meta1/meta1.conf"; - log { facility = mail; ident=meta1-MSA; } - auth { trusted_mechanisms = "CRAM-MD5 DIGEST-MD5"; - flags = { noplaintext }; } } - -For tests it is also possible to let MCP start only one SMTP server which -creates several copies of itself if multiple daemon addresses are -specified (see Section 3.10, item 1). Note: this only works for -unprivileged ports because the SMTP server does not run as root. - - -Protecting Recipients - -A few simple features are available to protect recipients by restricting -who can send mail to them. To do this the configuration section -protected_recipients must be turned on and at least one of the two flags -sender and client_ip must be selected (see Section 3.10, item 19a). If -this is done, then every recipient is looked up in the access map (which -must be activated, see Section 3.10, item 3b), using the tag -protectedrcpt:. If a matching entry is found, it must have a list of (one -or more) restrictions, each of which must be one of the following: - -+-----------------------------------------------+ -| restriction | required allow_by flag | -|----------------------+------------------------| -| from:sender | sender | -|----------------------+------------------------| -| cltaddr:IPv4-address | client_ip | -|----------------------+------------------------| -| list:alias | sender | -+-----------------------------------------------+ - -The meaning of the first two restriction types should be obvious, the -third one is interesting: it refers to an alias (in the aliases map, see -Section 3.9.3) and requires that the sender address matches one of the -entries to which the alias expands. This can be used to allow only -subscribed members of a mailing list to send mail to it. - -The restrictions are evaluated sequentially, if there is a match, the -recipient is accepted (sequential OR). If none of them matches, the -recipient is rejected. - -By default exact matches are required. However, if the flag generic_lookup -is set (see Section 3.10, item 19b), the items are looked up as specified -in Section 3.12.1. The flag implicitly_match_detail is useful for the -list: restriction if a sender uses +detail without having that specified -during subscription. - -Examples: consider the following aliases map: - -list1: - -list2: - -list3: - -together with this access map: - -protectedrcpt:list1@local.dom list: - -protectedrcpt:list3 from: cltaddr:1.2.3.4 - cltaddr:10 - -The mails to are only accepted from -and . Note: the list is not recursively expanded, i.e., -members of list2 are not allowed, that restriction must be listed in the -access map. Mails to are only accepted from -, the client with the IPv4 address 1.2.3.4, or -clients in the IPv4 net 10. The latter requires that the flag -generic_lookup is turned on too. - - -Configuration for SMTP Client - -The following configuration options are valid for SMTPC: - - 1. io_timeout: timeout for SMTP operations (unit: s). - 2. LMTP_socket: Unix domain socket to use for LMTP [default: lmtpsock]. - 3. log_level: logging level. - - 4. tls: this is a subsection that specifies the parameters for STARTTLS - support. It is only available if the system been configured with the - option --enable-TLS, see Section 2.2.1. See Section 11.1 for some - background information about these options. - 1. cert_file: file with certificate in PEM format. - 2. key_file: file with private key for certificate in PEM format. - 3. CAcert_file: file with CA certificate in PEM format. - 4. CAcert_directory: directory with (symbolic links for) CA - certificates in PEM format. - - 5. wait_for_server: maximum amount of time to wait for a server (QMGR) to - become available (unit: s). - - -SMTP Client Session/Recipient Configuration - -The following options can only be set via the access map (see Section -3.9.3, tag smtpc_rcpt_conf) or the configuration map for QMGR (see 3.8.1, -tag smtpc_session_conf) not in the SMTP client configuration section -itself, as they apply to a session or recipient, not globally. Currently -only STARTTLS requirements are available which are documented in Section -3.13, more option might be added later on. Note: as more options might be -added, the structure of this may change a bit. - - -Lookup Orders - - -Lookup Orders in Maps - -In many cases an item is not just looked up verbatim in a map, but it may -be split into logical parts and then less significant parts are -iteratively removed and the remaining data is looked up until either a -match is found or the data is empty; in the latter case a default key may -be looked up depending on the map. These steps can be controlled by flags -that are specified in the configuration file for the map. These flags are -listed below for the various lookup steps. - -For domain names of the form ``sub2.sub1.tld'' the lookup order is -``sub2.sub1.tld'', ``.sub1.tld'', ``.tld'', and ``.'' (without the -quotes). The subdomains are tried if the flag dotsubdomain is set. The -last lookup (``.'') is only done if the flag dot is set, as it is the -default for mailertable. Obviously this schema is extended if more -components are specified. As the sequence shows there is no implicit -``match all subdomains'' lookup, instead entries in a map must have a -leading dot for subdomains matches. To reiterate: ``sub2.sub1.tld'' does -neither match the entry ``sub1.tld'' nor ``tld''. - -For IPv4 addresses of the form ``A.B.C.D'', the lookup order is -``A.B.C.D'', ``A.B.C'', ``A.B'', and ``A'' (without the quotes). In -contrast to domain lookups, no trailing dots are required (nor checked) to -denote subnet matches, because the number of components of an IPv4 address -is fixed (and known) in contrast to the number of components in a host -name or domain name. - -For RFC 2821 addresses of the form ``'', where -``+detail'' is optional and ``+'' is the first delimiter in the localpart -that was found in the address_delimiter string (see Section 3.9.2), the -lookups are done according to the following sequence: - - 1. Repeat the following lookups for each subdomain of domain (as - explained above): - 1. ``user+detail@subdomain'' if ``+detail'' exists; this is a - verbatim match. Flag: full_adress. - 2. ``user++@subdomain'' if ``+detail'' exists and ``detail'' is not - empty; this matches any non-empty ``+detail''. Note: the second - ``+'' character is a fixed metacharacter, it does not depend on - address_delimiter; it is a modelled after the ``+'' operator in - regular expressions etc to denote a non-empty sequence of items. - Flag: detail_plus - 3. ``user+*@subdomain'' if ``+detail'' exists; this matches any - ``+detail'' (including just ``+''). Flag: detail_star - 4. ``user*@subdomain''; this matches ``user@subdomain'' as well as - ``user+detail@subdomain'' (``detail'' can be empty). Note: ``*'' - is not a generic metacharacter here, it matches only a token - beginning with address_delimiter or an empty sequence, it does not - match any other character sequence. For example: the input - ``user1@subdomain'' does not match the LHS ``user*@subdomain''. - Flag: star - 5. ``user@subdomain''; this does not match if ``+detail'' exists, - unless the flag implicitly_match_detail is selected for the map to - implicitly match a detail even if there is no wildcard in the - pattern. - 6. ``@subdomain''. - - 2. If nothing has been found and the map type requests it, then try - localpart only (with the same meaning as above): - 1. ``user+detail'' if detail exists - 2. ``user++'' if detail exists and is not empty, - 3. ``user+*'' if detail exists, - 4. ``user*'', - 5. ``user'' - - -Lookup Orders for Anti-Spam Measures - -Map lookups for anti-spam measures are performed according to the SMTP -dialogue, i.e., connection information (cltaddr: and cltname:), MAIL -command (from:), and RCPT command (to:). Whether a rejection has an -immediate effect depends on the result of the lookup, e.g., the quick: -modifier, and whether the option delay_checks is set. If multiple checks -are performed during a single stage of the SMTP dialogue then they are -done sequentially until one of them returns something else than cont. - -Note: in the description of the algorithms below some items are marked as -check:. Only those can change the result value, other steps perform just -operations that may be needed later on but have no immediate effect on the -outcome of the checks. - - -Connect - -During connect the following operations are performed if the access flag -(see Section 3.10, item 3b) is enabled: - - 1. check: look up client IP address using tag cltaddr: (as explained in - 3.12.1) - 2. start DNS blacklist queries, - 3. map client IP address to client hostname returning the tuple - (clientresolve, clientname). - 4. check: look up cltresolve:clientresolve - 5. check: look up cltname:clientname (as explained in 3.12.1) - 6. check: look up results of DNS blacklists in access map. - - -MAIL - -After a MAIL command has been received the following checks are performed -unless the address is <> or a session check resulted in quick:relay or -quick:ok: - - 1. check: is the address routeable? That is, if the sender address would - be used as a recipient address (as it would be necessary if a DSN must - be sent) is it possible to find a host that will deal with the - address? This means that the domain part must have a valid MX or A - record or that routing is specified via mailertable. - 2. check: if the domain of sender address is local: is the local part - valid? - 3. check: look up the address in the access map (provided it is enabled) - with the tag from:. - 4. check: look up the IP addresses that were found when trying to - determine whether the address is routeable with the tag mxbadip: in - the access map. - - -RCPT - -A RCPT command causes different checks (note: these are sequential checks, -not exclusive, i.e., if the first one applies and it does not return a -decision, the second one is performed): - - 1. is this a relaying attempt and if so, is it authorized? Relaying can - be allowed for the entire session, e.g., due to the client IP address - or other authorization based on some authentication (STARTTLS, AUTH). - 2. are there any other restrictions for the recipient address? - -For case 1 the following tests are performed: - - 1. check: is the recipient local and does the address exist? If yes, it - is not a relaying attempt and hence allowed. - 2. check: look up the recipient address with the tag to: (provided the - access map is enabled) (provided the access map is enabled) and check - whether the RHS is relay, otherwise reject the RCPT command as - unauthorized relaying attempt unless the RHS is an error entry which - is then used as reply. - -For case 2 the following steps are taken: - - 1. look up address with tag protectedrcpt:, if found perform all the - necessary checks as explained in Section 3.10.3. - 2. check: look up the address using the tag to: if all of the following - three conditions are met: - 1. the access map is enabled. - 2. a session check did not result in quick:relay. - 3. a session check did not result in quick:ok and relaying is allowed - by other means. - 3. check: perform greylisting unless the session is marked as ok or relay - or the RCPT lookup returned quick:ok or quick:relay. - - -Macro Replacements in RHS - -The alias map allows the use of macro in the right hand side of map -entries. Macros have the form ``${name}'' (without the quotes). Available -macros are: user, detail, domain, tag, delimiter, subdomain, extension. -They have the obvious meaning; subdomain refers to the part of the domain -before the dot, i.e., if the pattern is @.domain and the input is -user@host.domain then subdomain refers to host, extension is the delimiter -and the detail together (provided the address contains them). - -Example: - -alias*@.domain user${extension}@${subdomain}.domain - -provides the following mappings: - -alias@host.domain user@host.domain -alias+detail@host2.domain user+detail@host2.domain - - -STARTTLS Restrictions - -STARTTLS requirements can be set for the SMTP server and SMTP client via -map entries (see Sections 3.10.1 and 3.11.1). These restrictions are -listed in a section called tls_requirements. - - 1. common_name: require that the CN (Common Name) of the presented TLS - certificate matches the specified value. - 2. cert_subject require that the CS (CERT subject) of the presented TLS - certificate matches the specified value. - 3. cert_issuer require that the DN (Distinguised Name) of the issuer of - the presented TLS certificate matches the specified value. - 4. min_cipher_bits require that the effective keylength (in bits) of the - symmetric encryption algorithm used for a TLS connection is at least - as big as the specified value. - 5. flags: available flags are currently: - 1. verified: the TLS connection must be verified, i.e., the cert - issuer must be listed in CAcert_file or CAcert_directory (see - Section 3.10, item 21). - 2. encrypted the TLS connection must be encrypted (i.e., the - effective keylength (in bits) of the symmetric encryption - algorithm used for a TLS connection is greater than zero. - 6. requirements_violation See Section 3.10, item 21h, for possible - values. - -Example (note: the entry must be currently written in a single line to be -properly processed by createmap(8)): - -smtpc_rcpt_conf:@meta.org tls_requirements { cert_issuer="/C=US/ST=Berkeley/L=Endmail+20Org/O=MTA/CN=Claus+20Assmann+20CA+20RSA+202007/emailAddress=ca+ca-rsa2007@esmtp.org"; } - - -VERP - -There are two ways to enable VERP [Ber97]: - - 1. Via the XVERP extension in the SMTP server (see Section 3.10, item 3j - ). - 2. Via an entry in aliases marking a list with verp-: - - otherlist: - - verp-otherlist: something - - -Running MeTA1 - - -Starting MeTA1 - -All components of MeTA1 are under control of the MCP which must be started -as root in the directory /var/spool/meta1 (i.e., the main queue directory, -see Section 2.4: MTAQDIR) using - -# ./mcp.sh start - -The script contains the runtime path for MCP based on the data used by -configure as well as a reference to the MeTA1 configuration file. - -To stop all MeTA1 components use - -# ./mcp.sh stop - -or simply terminate the MCP, it will forward the signal to all processes -it started. - -The MCP provides some restart functionality: if a process terminates -(e.g., crashes), it will restart it unless the exit code indicates that a -restart is useless, e.g., EX_USAGE. Moreover, the processes listed in the -restart dependencies will be stopped and started too. - - -Using MeTA1 only for Outgoing Mail - -MeTA1 can be used in combination with a MUA that speaks (E)SMTP directly -or with the sendmail 8 MSP (Mail Submission Program) for outgoing mail. -For the latter add this to your sendmail 8 submit.mc file (see also misc/ -sm8.submit.mc): - -LOCAL_RULE_0 -R$* + X<@$*> $#meta1 $@ localhost $: $1 <@$2> - -LOCAL_RULESETS -SHdrToSMTP -R$+ $: $>PseudoToReal $1 sender/recipient common -R$+ $: $>MasqSMTP $1 qualify unqual'ed names -R$* + X<@$*> $: $1 < @ $2 > -R$* < @ *LOCAL* > $* $: $1 < @ $j . > $2 - -MAILER_DEFINITIONS -Mmeta1, P=[IPC], F=kmDFMuXa, S=EnvFromSMTP/HdrFromSMTP, R=EnvToSMTP/HdrToSMTP, - E=\r\n, L=990, T=DNS/RFC822/SMTP, - A=TCP $h 2009 - -and run the SMTP server of MeTA1 as listener on localhost:2009. Then mail -to will be sent via MeTA1, i.e., by adding the -sequence +X to the address the mail will be redirected -to MeTA1 (and +X will be removed). After initial testing the relay mailer -can be changed to use port 2009 by default hence the local additions shown -above can be removed. - -There are also other programs available as substitute for the command line -invocation of sendmail as mail submission program, e.g., mini_sendmail [ -Posb]. - - -Using MeTA1 for Incoming Mail - - -Local Delivery and Specifying Local Domains - -If the domain of a recipient address matches an entry in mailertable (see -Section 3.9.3) with the right hand side lmtp:^4.1then SMTPC talks LMTP -over the local socket lmtpsock (see 3.11). If you have an LDA that runs as -daemon and can talk LMTP over a local socket you can use it for local -delivery. It is also possible to use procmail [vdBG] in LMTP mode and -start it from mcp, see meta1.conf. See contrib/procmail.lmtp.p0 for a -patch^4.2for procmail 3.22 to allow handling of addresses with extensions -(+detail) in LMTP mode. A mailertable for local delivery via LMTP should -look like this: - -localhost lmtp: - -MY.DOM lmtp: - -HOST.MY.DOM lmtp: - -By default mail to addresses whose domain part is listed in mailertable -with RHS lmtp: is allowed, i.e., those domains are considered local and -hence relaying (even though technically this might not be called relaying) -to them is allowed. This behavior can be turned off (see Section 3.10, -item 3f) in which case it is necessary to also allow relaying to these -domains which can be done either via the access map (see Section 3.10, 3b -), or the command line option -T for SMTPS. This allows for treating (some -of) these domains as private by not allowing relaying to them, hence they -will be only reachable from systems from which relaying is allowed. - - -Specifying Valid Local Addresses - -To validate addresses for local domains, SMAR uses the map aliases.db -(Section 3.9.2, item 3a), which can be created using createmap, or a map -specified by the option local_user_map (see Section 3.9.2, item 7). The -key in the map must be the local part of a valid (local) e-mail address. -If the local part cannot be found in either map, the address is rejected. - -To list valid local addresses in the alias map the right hand side must be -the string ``local:'', e.g., - -postmaster: - -abuse: user+abuse - -user++: local: - -user: local: - -Note: local addresses are checked for the envelope recipient and sender. - - -Using MeTA1 as Gateway - -MeTA1 can easily be used as an internet gateway. To override routing, -mailertable entries (see Section 3.9.3) can be specified. A list of valid -addresses can be made available via the access map by allowing relaying to -those addresses instead of entire domains, e.g., - -to:user1@my.domain relay - -to:user2@my.domain relay - -to:postmaster@my.domain relay - -cltaddr:10.12 relay - - -Using MeTA1 as Backup MX Server - -The previous section showed how to specify valid remote addresses if all -of them are known. However, for systems that act as backup MX servers it -might not be simple to always keep such a list up to date. In that case, a -default entry for a domain should be made, e.g., - -to:user1@other.domain relay - -to:user2@other.domain relay - -to:postmaster@other.domain relay - -to:@other.domain error:451 4.3.3 Try main MX server - -cltaddr:10.12 quick:relay - -cltaddr:127.0.0.1 quick:relay - -The last two entries allow local systems to send mail to any user at -other.domain; without those entries mail to unlisted users will be -(temporarily) rejected and hence cannot be delivered via this system. - -Note about Backup MX Servers - -It is not a good idea to run a backup MX server B for a host A that has -stronger anti-spam measures; if mails are sent to A via B, then B may -accept them for delivery, but A may reject them and hence B has to sent -bounces, which, in case of spam, are most likely to forged addresses, -hence those bounces will only cause additional problems. The opposite case -(B has stronger anti-spam measures than A) can cause the rejection of mail -that A actually wanted to receive. Hence B and A should have the same -anti-spam measures; i.e., a system that acts as backup MX server for -another one should perform the same anti-spam checks as the main MX server -(s). - - -Miscellaneous Programs - - -Do not run programs as root User - -Almost all MeTA1 programs (except for MCP) refuse to run with root -privileges. To run a program as a different user the utility misc/runas -can be used, e.g., after installation in /usr/local/bin/ - -# /usr/local/bin/runas meta1q mailq -V - -(specify -h to see the usage). - - -Displaying Content of Mail Queues - -The program mailq displays the content of the mail queues (defedb and -ibdb). Currently its output is in a similar format as the sendmail 8 -version. The option -h shows how to use the program; see the previous -section about using runas for mailq. A simple shell script wrapper -mailq.sh is available that invokes mailq via runas. Note: the output of -this program might not be accurate due to internal buffering by QMGR. -Moreover, this program reads DEFEDB in such a way that only entries that -have been checkpointed (see Section 8.2 about options for checkpoints) are -shown. This is done to avoid interference with the operation of QMGR. - - -Interacting with QMGR - -The program qmgrctl allows to interact with the QMGR via the control -socket (see Section 3.8, item 3). Invoke qmgrctl -h to see the available -options. By default the program will show the current status of QMGR. If -QMGR has been compiled with the option QMGR_STATS (see Section 12.1) then -additional statistics is available, e.g., the number of transactions and -recipients that has been handled. - -Enhancement to this program are welcome to provide more functionality. - - -Reloading Maps - -Maps (for SMAR and QMGR) can be reloaded by moving the old db file out of -the way, creating a new file and then sending a USR1 signal to the -appropriate process to reopen the map. - -# mv $MAP.db $MAP.old.db -# /usr/local/bin/runas meta1q createmap -F $MAP.db < $MAP -# kill -USR1 $PID - -Note: for QMGR it is also possible to use qmgrctl -r instead, see Section -4.6.3. - - -Logging - -Logging is done via syslog(3) (see Section 3.5, 1) or to stdout/stderr, -which is redirected by the default MCP configuration to PROG.log. The -logging format is not yet completely consistent across programs. Moreover, -the logging entries might not be easy to understand because they contain -some details which are not interesting to a potential postmaster, but to -developers. Nevertheless, the logging entries should show the flow of mail -through the system. See Section 10.3 for an explanation of the format of -logfile entries. - -Note: logfiles must exist with the proper owner and permissions to be -used. Neither MCP nor the modules will currently create logfiles. This is -done by make install, i.e., misc/sm.setup.sh, which parses meta1.conf to -extract the section titles/names and user entries to create the logfiles -with the correct name and owner. This does not (yet) properly work if -unique logfile names are created, see Section 8.2, 3. - -Logfile Rotation - -Unless syslog(3) is used (see Section 3.5, 1), logfile rotation can be -achieved by copying the existing logfile to a backup file, e.g., - -# cp qmgr.log qmgr.log.0 - -and sending a USR2 signal which will cause the processes to rewind the -logfile. Note: the author is aware that this is not an optimal solution, -however, using syslog(3) will usually provide a better way. - - -Regular Checks - -There are at least two things that should be done regularly: - - 1. Check the logfile for errors^4.3: - - $ egrep 'sev=(ALERT|CRIT|ERR|FAIL)|\' $LOGFILE - - 2. Keep track of the size of the processes, e.g, - - $ date >> $MTAPROCS - $ ps axuww | grep '^meta1' | sort >> $MTAPROCS - - If one of the processes continuously grows then MeTA1 should be - compiled with -DSM_HEAP_CHECK (see Section 12.1.5) and a heap dump - should be taken regularly by sending the USR1 signal to the process. - By comparing subsequent heap dumps it should be possible to locate a - possible memory leak. - -Please report problems that cannot be resolved locally, see Section 1.4.1. - - -Dealing with Errors - - -Resource Problems - -Resource problems in certain parts of the code can lead to a stop of the -involved program. In such a case it will be restarted automatically but if -the resource problem has not been taken care of the MTA may stop again. In -that case manual interaction is required. The simple solution to a -resource problem is of course to add more resources (RAM/disk) or to free -up some resources, e.g., stopping programs that do not need to run or -deleting unused files. There are also ways to control resource usage -within MeTA1: - - * memory shortage: the memory usage of MeTA1 can be controlled by - restricting the size of various data structures, see Section 3.8, - e.g., AQ_max_entries, IQDB, and OCC_max_entries. However, setting - these values too low will result in a very slow MTA that may operate - in a degraded state which is not acceptable. - * disk shortage: MeTA1 has options that let it decide how much free disk - space is needed for operation, see Section 3.8: ok_disk_space and - min_disk_space. However, if there is not enough space to store the - envelope databases (DEFEDB and IBDB) then the system cannot work, - hence sufficiently free disk space is essential for proper operation. - - -Database Problems - -See Section 7.1 for some background information about the usage of the -various databases before trying to fix any possible problems. - -If the deferred database is corrupted then the Berkeley DB utilities to -deal with such situations should be tried [Sleb], e.g., db_recover. - -Currently messages stored in CDB have the transaction identifier (ss_ta, -see Section 10.3) as filename. In the worst case, i.e., if IBDB or DEFEDB -are destroyed, this allows to reconstruct the envelope data together with -the logfile entries. See the script misc/rcvrenvfromlog.sh for an example, -here is a description of its operation. First, check which messages are -still in CDB: in the CDB directory (3.4: CDB_base_directory) issue: - -# ls -1 [0-9A-F]/S* - -Then search for each of those transaction ids ($TAID) in the logfile -($LOG): - -$ egrep "ss_ta=$TAID, (mail|rcpt)=" $LOG | \ - sed -e 's;^.*\(mail=<.*>\), .*;\1;' -e 's;^.*\(rcpt=<.*>\), .*;\1;' - -will show the sender (mail=) and the recipients (rcpt=). Based on this -data it is possible to resend the messages. - -Note: contributions in this area are welcome, e.g., better scripts that -perform more checks and maybe allow for completely automatic recovery. - - -Writing Core Dumps - -By default, all MeTA1 processes are executed in the main queue directory. -As those processes are running with different user and group ids not all -of them can write a core dump into that directory if a fatal error occurs. -Some operating systems have commands (e.g., coreadm(1M) on SunOS 5.x) to -specify a different directory in which a core dump is written. On -operating systems where such a command is not available, the option -working_directory can be used (see Section 8.2, item 4). - -Replacements for Features available in other MTAs - -MeTA1 does currently not offer some of the features that are available in -other MTAs. This section describes replacements or workarounds for some of -those features. - - 1. Address Masquerading: The best way to use the correct e-mail addresses - is to properly configure your MUA. Some MUAs offer more flexibility - for this than the default masquerading features of sendmail 8, e.g., - mutt [mut] allows to select sender addresses based on recipient - addresses. - - Alternatively a mail submission program (MSP) can be used which offers - address rewriting capabilities, e.g., the MSP from sendmail 8. - - 2. .forward: procmail can be used as LDA (see Section 4.3.1) and its - configuration file .procmailrc allows to implement the same - functionality as a .forward from sendmail 8 and some other MTAs. - - 3. Sending mail to programs: see previous item 2: this can be done with - the help of procmail. - - 4. Appending mails to files: see item 2: this can be done with the help - of procmail. - - -Policy Milter - - -Policy Milter Overview - -MeTA1 has support for a policy milter which is similar to a milter in -sendmail 8. The API is slightly different, however, it should be possible -to write an compatibility layer to emulate the sendmail 8 API. Another -difference is that MeTA1 itself only talks to a single pmilter. Support -for multiple pmilters should be implemented in a multiplexor that connects -to multiple pmilters and coordinates their responses. - - -Native Policy Milter API - -Note: this API may evolve over time. - -Naming conventions: A policy milter (also called pmilter) is a program -that uses the API provided by libpmilter. The latter interacts with the -SMTP servers via an internal protocol, i.e., this protocol can be changed -without changing the visible API and should not directly be accessed by a -user application. - - -Data Structures - -libpmilter itself uses three context structures all of which must be -treated by a milter as opaque. - - 1. pmg_ctx: ``global'' libpmilter context (only one per process). - 2. pmss_ctx: libpmilter context per SMTP server that connects to this - instance. There can be multiple SMTP servers connecting to one - libpmilter instance. - 3. pmse_ctx: libpmilter context per SMTP session. - -Any of the libpmilter functions takes one of these contexts as parameter; -e.g., all SMTP session oriented functions have a parameter of type -pmse_ctx_P. - -A milter can have its own contexts for each of these three environments, -see Section 5.2.5. - - -Start and Stop - -The functions in this section return SM_SUCCESS (0) on success and a -negative value in case of an error. - -First libpmilter must be initialized; a pmilter must specify a variable -pmg_ctx_P pmg_ctx; which is passed per reference to the initialization -function: - -sm_ret_T sm_pmfi_init(pmg_ctx_P *pmg_ctx) - -The pmilter global context must be treated as opaque data structure, it is -passed to subsequent libpmilter function calls. - -Next pmilter starts libpmilter by handing control over to the library; the -pmilter passes a description of its requirements and functionality: - -sm_ret_T sm_pmfi_start(pmg_ctx_P pmg_ctx, pmilter_P pmilter) - -A milter can stop by calling: - -sm_ret_T sm_pmfi_stop(pmg_ctx_P pmg_ctx) - -There are various functions to set some options which can be called after -libpmilter is initialized but before it is started. To set the path of the -Unix domain socket over which the SMTP servers (see Section 3.10, item 17) -and libpmilter communicate: - -sm_ret_T sm_pmfi_setconn(pmg_ctx_P pmg_ctx, const char *path) - -The backlog parameter of the listen(2) function can be set: - -sm_ret_T sm_pmfi_setbacklog(pmg_ctx_P pmg_ctx, int backlog) - -The debug level of libpmilter might be set via (this requires knowledge of -the internals of the library which can be acquired by looking at the -source code): - -sm_ret_T sm_pmfi_setdbg(pmg_ctx_P pmg_ctx, int debuglevel) - -To set the communication timeout: - -sm_ret_T sm_pmfi_settimeout(pmg_ctx_P pmg_ctx, int timeout) - - -New SMTP Server - -Whenever an SMTP server connects to a milter an option negotiation is -performed (similar to ESMTP itself). A pmilter can check whether server -capabilities are acceptable and return the options that it wants: - -sm_ret_T pmfi_negotiate(pmss_ctx_P pmss_ctx, uint32_t srv_cap, uint32_t -srv_fct, uint32_t srv_feat, uint32_t srv_misc, uint32_t *pm_cap, uint32_t -*pm_fct, uint32_t *pm_feat, uint32_t *pm_misc) - -Currently only the capabilities field is used: srv_cap is set by the SMTP -server to a list (implemented as bit field) of phases of the ESMTP -dialogue that can be passed to a pmilter. In turn the pmilter must set -*pm_cap to includes those phases of the ESMTP dialogue that it wants to -receive. For details, see include/sm/pmilter.h. For each of those phases a -callback is invoked (see Section 5.2.4) which must be set by the pmilter -in its description structure struct pmilter_S (see include/sm/pmfapi.h). - - -SMTP Session and Transaction - -The protocol steps from ESMTP are forwarded to the policy milter which can -decide to accept or reject them. - - * New SMTP session: - - sfsistat_T pmfi_connect(pmse_ctx_P pmse_ctx, const char *hostname, - sm_sock_addr_T *hostaddr) - - hostname: host name, as determined by a reverse lookup on the host IP - address; hostaddr: host address, as determined by a getpeername(2) - call on the SMTP socket. - - * SMTP HELO/EHLO command: - - sfsistat_T pmfi_helo(pmse_ctx_P pmse_ctx, const char *helohost, bool - ehlo) - - helohost: Value passed to HELO/EHLO command, which should be the - domain name of the sending host. ehlo: true iff EHLO was used. - - * MAIL (envelope sender): - - sfsistat_T pmfi_mail(pmse_ctx_P pmse_ctx, const char *mail, char - **argv) - - mail: envelope mail address; argv: null-terminated MAIL command - arguments. - - * RCPT (envelope recipient): - - sfsistat_T pmfi_rcpt(pmse_ctx_P pmse_ctx, const char *rcpt, char - **argv) - - rcpt: envelope recipient address; argv: null-terminated RCPT command - arguments. - - * DATA: - - sfsistat_T pmfi_data(pmse_ctx_P pmse_ctx) - - * unknown/not implemented SMTP command: - - sfsistat_T pmfi_unknown(pmse_ctx_P pmse_ctx, const char *cmd) - - cmd: SMTP command. Note: this is not yet implemented. - - * For each chunk of a message: - - sfsistat_T pmfi_msg(pmse_ctx_P pmse_ctx, unsigned char *msgp, size_t - msglen) - - msgp: pointer to message data; msglen: length of message data. There - may be multiple message chunks passed to the filter. End-of-lines are - represented as received from SMTP (normally Carriage-Return/Line-Feed; - CRLF). Notes: - + the last message chunk contains the final dot of the SMTP - transmission, i.e., ``CRLF.CRLF'' - + the message is not modified in any form, i.e., dots at the begin - of a line are duplicated (by the SMTP client) as specified in - section 4.5.2 of RFC 2821 [Kle01] which must be undone by the - application if so desired. - + the message is streamed while being received. That is, the mail is - not first stored on disk and then sent to the filter, but each - part received from the client is sent directly to the filter (at - the same speed as received from the network which might be slow). - This may mean that the filter does not receive the entire message - as the transmission may get interrupted or the SMTP server may - decide to skip the rest of the message because it exceeds the - maximum size. - + the return code is ignored unless SM_SCAP_PM_MSG_RC is set, see - Section 5.2.11, item 2. - - * End of message (final dot of message has been received): - - sfsistat_T pmfi_eom(pmse_ctx_P pmse_ctx) - - * Message is aborted outside of the control of the filter, for example, - if the SMTP client issues an RSET command. - - sm_ret_T pmfi_abort(pmse_ctx_P pmse_ctx) - - * QUIT (end of an SMTP session): - - sm_ret_T pmfi_close(pmse_ctx_P pmse_ctx) - - This is called when an SMTP session ends. - - -Set and Get pmilter Contexts - -As explained in Section 5.2.1 a milter can have a ``global'' context -pmilter_g_ctx, a context per SMTP server pmilter_ss_ctx, and a context per -SMTP session pmilter_se_ctx. The following functions are provided to set -and get these contexts. - -Set the ``global'' context pmilter_g_ctx: - -sm_ret_T sm_pmfi_set_ctx_g(pmg_ctx_P pmg_ctx, void *pmilter_g_ctx). - -This must be done after libpmilter has been initialized but before control -is transferred to it. - -To retrieve the ``global'' context invoke: - -void *sm_pmfi_get_ctx_g(pmg_ctx_P pmg_ctx) - -Note: this requires the ``global'' libpmilter context which is not usually -passed to pmilter functions in callbacks. See below how to access the -``global'' context pmilter_g_ctx from other places. - -To set the pmilter context per SMTP server pmilter_ss_ctx use: - -sm_ret_T sm_pmfi_set_ctx_ss(pmss_ctx_P pmss_ctx, void *pmilter_ss_ctx); - -to retrieve it call: - -void *sm_pmfi_get_ctx_ss(pmss_ctx_P pmss_ctx) - -The ``global'' pmilter context pmilter_g_ctx can be retrieved from the -libpmilter context per SMTP server: - -void *sm_pmfi_get_ctx_g_ss(pmss_ctx_P pmss_ctx) - -At the lowest level a context per SMTP session pmilter_se_ctx can be set -via: - -sm_ret_T sm_pmfi_set_ctx_se(pmse_ctx_P pmse_ctx, void *pmilter_se_ctx) - -and retrieved by: - -void *sm_pmfi_get_ctx_se(pmse_ctx_P pmse_ctx). - -Just as before there is a function to retrieve the pmilter context per -SMTP server pmilter_ss_ctx from the libpmilter context per SMTP session: - -void *sm_pmfi_get_ctx_ss_se(pmse_ctx_P pmse_ctx) - -Note: if a pmilter uses these contexts, then it is useful that each -``lower level'' context contains a link to its ``higher level'' context. -That is, each pmilter context per SMTP session pmilter_se_ctx should have -a pointer to its pmilter context per SMTP server pmilter_ss_ctx which in -turn should have a pointer to the ``global'' pmilter context -pmilter_g_ctx. This allows access from a function that is specific to a -SMTP session to each relevant context. - - -Accessing MTA Symbols - -A pmilter can set a list of symbols it wants to receive from the MTA by -calling - -sm_pmfi_setmaclist(pmss_ctx_P pmss_ctx, uint where, ...) - -during the option negotiation, i.e., in pmfi_negotiate(). The parameter -where denotes the stage of the ESMTP dialogue when the value of the symbol -should be sent. It must be one of - -PM_SMST_CONNECT Session start - -PM_SMST_EHLO EHLO or HELO command - -PM_SMST_MAIL MAIL command - -PM_SMST_RCPT RCPT command - -PM_SMST_DATA DATA command - -PM_SMST_DOT Final dot of mail body - -A sequence of up to PM_MAX_MACROS macros can be requested which must end -with PMM_END. Valid values are: - - 1. PMM_SRVHOSTNAME hostname of SMTP server. - 2. PMM_SEID session id. - 3. PMM_CLIENT_RESOLVE result of client lookups. - 4. PMM_MAIL_TAID transaction id. - 5. PMM_DOT_MSGID Message-Id. - 6. PMM_TLS_VERSION TLS/SSL version used. - 7. PMM_TLS_CIPHER_SUITE cipher suite used. - 8. PMM_TLS_CIPHER_BITS effective key length of the symmetric encryption - algorithm. - 9. PMM_TLS_ALG_BITS maximum key length of the symmetric encryption - algorithm. This may be less than the effective key length for export - controlled algorithms. -10. PMM_TLS_VRFY the result of the verification of the presented cert. -11. PMM_TLS_CERT_SUBJECT the DN (distinguished name) of the presented - certificate. -12. PMM_TLS_CERT_ISSUER the DN (distinguished name) of the CA (certifcate - authority) that signed the presented certificate (the cert issuer). -13. PMM_TLS_CN_SUBJECT the CN (common name) of the presented certificate. -14. PMM_TLS_CN_ISSUER the CN (common name) of the CA that signed the - presented certificate. - -Notes: - - * PMM_MAIL_TAID cannot be requested before PM_SMST_MAIL and - PMM_DOT_MSGID can only be requested at stage PM_SMST_DOT. - * All macros beginning with PMM_TLS are only valid after a STARTTLS - command. - -To retrieve the value of a symbol the function - -sm_pmfi_getmac(pmse_ctx_P pmse_ctx, uint32_t macro, char **pvalue) - -can be used in the various callback functions of the ESMTP dialogue. If -the macro was not in the request list, an error will be returned. If the -macro has not yet been received, *pvalue will be NULL. Otherwise *pvalue -will point to the value of the macro. Note: the string to which *pvalue -points must not be changed. - - -Sender Modification - -The sender address (MAIL) can be replaced: - -sm_ret_T sm_pmfi_mail_rplc(pmse_ctx_P pmse_ctx, const char *mail_pa, char -**argv) - -This function must only be called during pmfi_eom(). The address mail_pa -must be in RFC 2821 format. The argument argv can be used to specify SMTP -parameters for the sender address, however, this is currently not -implemented, hence it must be set to NULL for now. - - -Recipient Modifications - -Recipients can be added: - -sm_ret_T sm_pmfi_rcpt_add(pmse_ctx_P pmse_ctx, const char *rcpt_pa, char -**argv) - -or deleted: - -sm_ret_T sm_pmfi_rcpt_del(pmse_ctx_P pmse_ctx, const char *rcpt_pa, -rcpt_idx_T rcpt_idx) - -These functions must only be called during pmfi_eom(). The addresses -rcpt_pa must be in RFC 2821 format. The argument argv can be used to -specify SMTP parameters for the recipient address, however, this is -currently not implemented, hence it must be set to NULL for now. As the -MTA does not remove identical recipient addresses, the address itself is -not sufficient to identify one RCPT, but its index must be specified too. -This index can be retrieved during a RCPT command (pmfi_rcpt()) using - -sm_ret_T sm_pmfi_getrcpt_idx(pmse_ctx_P pmse_ctx, rcpt_idx_T *prcpt_idx) - -Note: it is invalid to remove all recipients of a transaction. To discard -a transaction, return SMTP_R_DISCARD as a result of one of the transaction -oriented callbacks, e.g., pmfi_eom(). - - -Header Modifications - -To request modifications of the header of a mail being sent, the function - -sm_pmfi_hdr_mod(pmse_ctx_P pmse_ctx, uint type, uint pos, const unsigned -char *header) - -can be used. This function must only be called during pmfi_eom(). The -argument type specifies which kind of modification is requested, -legitimate values are defined in include/sm/hdrmoddef.h; these are: -SM_HDRMOD_T_PREPEND, SM_HDRMOD_T_INSERT, SM_HDRMOD_T_REPLACE, -SM_HDRMOD_T_REMOVE, and SM_HDRMOD_T_APPEND. - -The argument header must be a complete header line including the proper -line ending (CRLF). The argument pos specifies the position for the types -SM_HDRMOD_T_INSERT, SM_HDRMOD_T_REPLACE, and SM_HDRMOD_T_REMOVE. The first -header of the original mail has position one; zero is the Received: header -added by the SMTP server. - - -Message Replacement - -If a pmilter wants to replace the entire message, the function pmfi_eom() -must return the value SMTP_R_RPLCMSG. This will cause the invocation of -the callback - -sfsistat_T pmfi_msg_rplc(pmse_ctx_P pmse_ctx, const unsigned char -**pmsgchunk, size_t *pmsglen) - -which then must set a pointer to a message chunk and its length. Multiple -chunks can be sent by returning SMTP_R_CONT as result of the callback. For -the last chunk, SMTP_R_OK should be returned. The size of each chunk -(pmsglen) must be less than PMILTER_CHUNK_SIZE as defined in include/sm/ -pmfapi.h. - -libpmilter will thereafter invoke the callback - -sfsistat_T pmfi_msg_rplc_stat(pmse_ctx_P pmse_ctx, sm_ret_T status) - -to give the pmilter a chance to clean up after the transaction, and to let -it know whether the message replacement was successful. - -Notes: - - * as the entire message is replaced and by default only the data that is - received from the SMTP client is sent to a pmilter, the Received: - header field that smtps generates is lost. To avoid this, a pmilter - can request to receive that header field by setting - SM_SCAP_PM_SND_RCVD and sending it as first chunk of the message - replacement. - * the message must be in SMTP format, i.e., lines must end in CRLF and - the final chunk should have the usual SMTP end of message indication: - CRLF dot CRLF (\r\n.\r\n), however, it can also just end in CRLF. - * if pmfi_msg_rplc() encounters an error, e.g., due to an API violation - or due to a communication error with smtps, then it will invoke - pmfi_msg_rplc_stat() directly without waiting for the entire message - even if it consists of more chunks. - - -Further Capabilities - -In addition to selecting which SMTP commands to send to pmilter (see -Section 5.2.3), there are some more capabilities available: - - 1. SM_SCAP_PM_RCPT_ST causes the MTA to send RCPT information even if the - command has been rejected, e.g., because the recipient is unknown, the - recipient has been rejected due to access map checks, or relaying has - been denied. Note: RCPT commands that are rejected for other reasons, - e.g., because the address is syntactically invalid, or some limit - (maximum number of recipients) is exceeded, will not be sent to - pmilter. - - The function - - sm_ret_T sm_pmfi_getstatus(pmse_ctx_P pmse_ctx, sfsistat_T *pstatus) - - should be used in that case to access the current SMTP reply code for - the command. This functionality is useful for a pmilter that wants to - keep track of all recipients, not just those which are accepted, e.g., - to deal with dictionary attacks. - - 2. SM_SCAP_PM_MSG_RC allows a pmilter to return a reply code as specified - in 5.2.13 from pmfi_msg(). This is useful if a pmilter can make a - decision about the mail without having to read the entire message. If - this capability is turned on, pmfi_msg() must return SMTP_R_CONT for - each message chunk by default to receive subsequent parts. Otherwise - pmfi_eom() will not be called but the return code from pmfi_msg() will - be used at the end of the message (in response to the final dot). - - -Miscellaneous Functions - -To set a reply text in an SMTP session or transaction oriented callback in -addition to the reply code use: - -sm_ret_T sm_pmfi_setreply(pmse_ctx_P pmse_ctx, const char *reply) - -Note: the reply string must contain the full SMTP reply, i.e., it must be -of the form - -XYZ D.S.N text\r\n - -where XYZ is a valid SMTP reply code (see RFC 2821 [Kle01]) which must -match the return code of the function from which sm_pmfi_setreply() is -called, D.S.N is an enhanced status code as defined in RFC 3463 [Vau03] -and the rest is an explanation of the status including CRLF (\r\n). The -text can be a multi-line reply in the form: - -XYZ-D.S.N text1 -XYZ-D.S.N text2 -XYZ D.S.N text3 - -which must be specified in the format required by SMTP: - -XYZ-D.S.N text1\r\nXYZ-D.S.N text2\r\nXYZ D.S.N text3\r\n - -To set reply codes for commands that need multiple reply values the -function: - -sm_ret_T sm_pmfi_setreplies(pmse_ctx_P pmse_ctx, uint nreplies, int -*rcodes, const char **rtexts) - -must be used. Currently this function makes only sense if PRDR is -available in the SMTP server and actually used by the client. A pmilter -can determine the latter by parsing the arguments of the MAIL command (see -pmfi_mail()). Note: currently the argument rtexts is ignored, only the -array of reply codes (rcodes) is used. The size of this array must be -nreplies which must match the number of valid RCPTs for this transaction. -The reply codes in that array must be in the same order in which the RCPTs -have been received. - -Return version number of libpmilter: - -sm_ret_T sm_pmfi_version(pmg_ctx_P pmg_ctx, uint32_t *major, uint32_t -*minor, uint32_t *patchlevel) - -This can be used to compare the version number of the library against -which pmilter is linked with the version number against which pmilter is -compiled. The major version numbers must match otherwise the program will -not run. - -Signal handler callback: - -sm_ret_T pmfi_signal(pmg_ctx_P pmg_ctx, int sig) - -This function will be called when a USR1 or USR2 signal is received; it is -not called within a signal handler, i.e., the code does not have to be -signal-safe. Note: this is not yet implemented. - - -Return Values - -SMTP Session and transaction oriented functions use sfsistat_T as return -type. Allowed values for this type are (as defined in include/sm/ -smreplycodes.h): - - * SMTP_R_OK: accept command. - * SMTP_R_ACCEPT: accept entire transaction or session depending on where - this value is returned. Note: this is just a shortcut for - SMTP_R_SET_QUICK(SMTP_R_OK). - * SMTP_R_DISCARD: discard effect of command. - * SMTP_R_CONT: continue other checks. - * SMTP_R_SSD: shut down SMTP session. - * SMTP_R_TEMP: reject command with a temporary error. - * SMTP_R_SYNTAX: syntax error. - * SMTP_R_PERM: reject command with a permanent error. - * other valid SMTP reply codes [Kle01]. - -Additionally return values can be modified by using SMTP_R_SET_QUICK -(returnvalue). See Section 3.9.3 for the effects of this. - -For functions that use sm_ret_T as return type a successful call returns -SM_SUCCESS (0) and a negative value in case of an error. - - -Implementation Notes - -As libpmilter currently does not keep track of the status of a transaction -or session, the functions pmfi_abort() and pmfi_close() may be called even -if no transaction or session is currently active. This can happen if an -SMTP server unexpectedly aborts the connection to a policy milter. An -application must be aware of this and keep track of its state properly. - - -Policy Milter Examples - -The program libpmilter/example-pmilter-0.c is a simple example how to -write a policy milter. It might be useful as a template for other milters. - -Also available is a policy milter contrib/milter-spamd.c that offers an -interface to spamd(1) which is a daemonized version of spamassassin(1). -milter-spamd.c is written by Daniel Hartmeier [Harc] (see the file itself -for the Copyright) for sendmail 8 and modified to work with the policy -milter API of MeTA1. - -Miscellaneous - - -Troubleshooting - -If something goes wrong then the component which fails usually logs an -error message. Depending on the configuration, an error is either logged -via syslog(3) or printed into a logfile (as explained in Section 4.8). -Note: even if the system is configured to use syslog(3) (Section 3.4, item -1) errors at startup are printed to the logfile if those errors occur -before the configuration is read, hence those files need to be checked -too. - - -Startup Problems - -If MeTA1 fails to start properly the reason should be logged as explained -before. Some possible reasons are - - 1. invalid configuration file: use misc/smconf to check the syntax before - deploying a new configuration file. - - 2. wrong permissions: check the permissions as explained in Section 2.4: - - $ ./misc/sm.check.sh - - 3. missing or invalid maps: make sure maps are created properly with - createmap(8). - - -Logfile Entries - -Most logfile entries should be self-explaining. However, some are more -subtle and indicate only indirectly what might be wrong. Example: - -smtps: ... client_name=Hostname_Not_Determined - -indicates that the access map (Section 3.10, 3b) is not used which might -point to a misconfiguration. - -Caveats - -The following problems exist in this version of MeTA1: - - * If the system runs out of memory then the MTA may not act gracefully - in all cases, see Section 4.10.1. - - * If a disk that is used for one of the queues becomes full, some errors - may not be handled gracefully, see Section 4.10.1. To avoid this, - MeTA1 has some limits for the amount of available disk space that is - required to accept mail (see Section 3.8). - -Checks in SMTP Server - -The SMTP server has some builtin checks which are explained in the -following. - - -Strict RFC Compliance - -The SMTP server currently enforces fairly strict RFC 2821 compliance. For -example, a MAIL command must be given in the following format - -MAIL From: - -i.e., the angle brackets are required, there must be no space after ":", -etc. This has the useful side effect of catching some spam programs: - -5.5.0 Syntax error., input=MAIL FROM: - -Moreover, the server requires that lines end in CRLF (\r\n), it will not -accept command input without the correct line ending, i.e., trying to do -that will cause a read error. - -Another requirement is that MX records must point to hostnames, not IP -addresses [Moc87]. This applies to receiving mail - a MAIL address using a -domain whose MX record points to an IP address will be rejected (553 5.1.8 -Sender address does not exist) - as well as to sending mail - a RCPT -address with a domain whose MX record points to an IP address is not -resolved by SMAR. - -Various Checks - -The EHLO parameter is checked against the local hostname unless the -connection comes from localhost (IP address 127.0.0.1) or the access map -returned quick:ok or quick:relay, see Section 3.9.3. Violations will be -logged with a status text of Identity_Theft. - -The SMTP server checks for ``illegal pipelining'', i.e., whether a client -sends commands before it is allowed to do so. Moreover, it also checks -whether the client sends a command before the initial greeting. Note: -according to RFC 2821 the client SHOULD wait for the greeting, but this is -not (yet) a requirement. To turn this off, use allow_data_before_greeting -(Section 3.10, item 3k.) - -Security Checks - -There are currently no additional security checks when creating/accessing -files or directories besides those provided by the operating system. This -could be a problem if MCP is misconfigured because it runs as root. Hence -it will simply overwrite existing files if those are specified in the -configuration file. The other modules run as non-privileged users, hence -the OS provides sufficient access checks - unless the system is -misconfigured and the MeTA1 accounts are misused for other purposes too. - -Restrictions - -Besides the obviously missing functionality there are some other things -that may restrict the use of MeTA1 in certain environments. Here is an -incomplete list: - - * DNS lookups currently use only UDP by default, hence answers that - exceed the UDP packet size will cause problems. However, such DNS - packets are really rare (because they cause operational problems in - various places, e.g., some firewalls may block TCP for port 53). A - possible workaround might be to force TCP (see Section 3.9.2, item 1 - (a)i), the correct way is a change in the DNS library to retry with - TCP, but this has not yet been implemented. - - * Map lookups convert keys to lower case before checking an entry. In - general this is not a problem unless local addresses rely on - preserving the case of the local parts of addresses. That is, local - addresses which require upper case characters do not work. - - * Multi-line replies from an SMTP server are currently neither stored - (for a possible DSN) nor logged, instead just the last line is used - for that purpose. - -Everything that is not described in the documentation does either not -exist in the current version of MeTA1, or is unlikely to work. However, -there may be omissions in the documentation, please inform the author of -such bugs. - -Code Review, Enhancements, Patches - -Source code inspection as well as patches and suggestions are very -welcome. - -Enhancements and extensions are very welcome too, especially to extend the -basic functionality of the current MeTA1 release. - -Porting - -Porting to currently unsupported platforms including non-Unix systems is -encouraged. Note that the destination system must support statethreads [ -SGI01] and Berkeley DB 4.x. It might be necessary to port those first. - - -Version Naming - -Each MeTA1 version has a name in the following format: - -MeTA1-major.minor.[qualifier]qualifier-version.patchlevel - -The major number changes between releases when new features are introduced -(major changes, but see below about the development phases). The minor -number changes when no new features are introduced, but bugfixes and -(portability) enhancements are made. That is, no configuration changes are -needed when going from one minor version to the next. The patchlevel -number is used for intermediate patches between releases, e.g., if -something is broken but it is not important enough for a new release -because it is barely used or encountered. - -There are several different qualifiers: - - 1. PreAlpha: This means the software is not feature complete and hence - might be missing some functionality that is considered important by - different users. Additionally, there is most likely no compatibility - in data structures stored on disk between different pre-alpha - versions, e.g., when upgrading from PreAlpha16 to PreAlpha17 the main - queue format may have changed without checks in the software for this. - Hence old queues must be drained before upgrading. Moreover, the - protocols used for communication between MeTA1 modules may have - changed without providing backward compatibility, therefore modules - from different releases must not be used together. Such - incompatibilities are usually stated in the list of changes ChangeLog. - - Do not run this on a production server unless you are aware of the - possible consequences. The software is still under development and not - fully functional. Moreover, it may not be sufficiently tested. - - 2. Alpha: In this state the software is ready for public testing but its - features may still change. - - 3. Beta: Feature changes are unlikely, but still possible if required. - Usually only bugfixes occur between beta versions. - - 4. Gamma: This is a release candidate. Usually only critical bugfixes - occur between gamma versions. There might be no gamma versions at all - if beta testing was considered successful and sufficient. - - 5. A release version does not have an explicit qualifier. - -The qualifier-version is used to distinguish between different version of -the same qualifier, e.g., PreAlpha16 and PreAlpha17. It is 0 for a release -version. - -Examples for version names: MeTA1-0.0.PreAlpha19.0, MeTA1-1.0.0.0. - -See the file include/sm/version.h how the version string is converted into -a 32 bit number that denotes the version number. - -Snapshots - -From time to time snapshots may be made available. Those are marked with a -date in the distribution file name, e.g., meta1-0.0.16.0-20040928.tar.gz. -The name indicates that it is a snapshot of what will become version -meta1-0.0.16.0, i.e., the next release will have the given version number -(without the date). The only other indication in the distribution is the -inclusion of an s in the version number that is shown in the version -output of the main components. A snapshot did not go through the usual -release cycle and is made available as technology preview. - -Data Flow in MeTA1 - - -Data Flow in MeTA1 - -This Section explains how MeTA1 stores information about messages that are -transferred. It gives some background information which is useful for -troubleshooting. Details about the operation of MeTA1 can be found in [ -Assmb]. - -MeTA1 uses two different databases on disk to store envelope information -(sender and recipients): IBDB: incoming backup database, DEFEDB: deferred -envelope database, and one database to store message contents: CDB: -content database. See Section 2.4.1 about the location and layout of these -databases^7.1. The queue manager additionally uses two internal envelope -databases: IQDB (Incoming Queue DataBase) and AQ (Active Queue). - -Incoming mails are accepted by the SMTP servers which store the content in -the CDB (complete messages including headers in the format as received). -The envelope information, i.e., sender (MAIL) and recipients (RCPT), is -stored by the queue manager in IQDB and written to IBDB which is just a -log of envelope data and what happened to it. That is, the files in IBDB -are written sequentially and are continuously growing. If a file reaches -its size limit (see Section 3.8: IBDB), then it is closed and a new file -is opened. For a delivery, the envelope information must be transferred -into AQ. For incoming mail this happens as soon as a transaction is -accepted, in which case the data is moved from IQDB to AQ. A transaction -is only accepted if the message is safely written to CDB and the envelope -information has been committed to IBDB, i.e., all information is committed -to persistent storage^7.2. - -The scheduler in QMGR takes recipient envelopes from AQ and creates -transactions which are given to the SMTP clients for delivery. An SMTP -client takes the transaction information and tries to send a message whose -content is read from CDB. After a successful delivery attempt a record is -written to IBDB that logs this information. A cleanup task removes -periodically old IBDB files which contain only data that is no longer -referenced. - -The deferred envelope database is only used if a message cannot be -delivered during the first attempt. In that case the appropriate envelope -data is added to DEFEDB and a record is written to IBDB stating that the -data has been transferred to DEFEDB. Entries in DEFEDB contain a timestamp -called next-time-to-try at which QMGR reads them from the database into AQ -and the scheduler tries another delivery attempt. If that succeeds, the -entries are removed from DEFEDB, otherwise they are either requeued with a -new next-time-to-try (in case of a temporary error) or a DSN (bounce -message) is generated (in case of a permanent error). - -Advanced Configuration Options - - -Overview - -Some configuration options are only needed in special situations and may -require background knowledge of the involved systems. Those advanced -configuration options are explained in the subsequent sections. - - -Flags - -Usually flags are not set and hence a configuration file only needs to -turn on flags (if required). However, in some cases flags are set by -default and under some rare circumstances need to be disabled. To achieve -this, the name of the flag can be prefixed with one of not_, dont_, no_, --, !, or ~, e.g., ~remove_unused_logfiles or dont_remove_unused_logfiles. - - -Advanced Configuration for MCP - - 1. max_processes: maximum number of processes to start [default: 1]. - 2. min_processes: minimum number of processes to start [default: 1]. - 3. use_id_in_logfile_name: if more than one process can be started then - it might be useful to have unique logfiles unless the processes use - syslog(3). If set, this (boolean) option causes MCP to include a - unique identifier (the same as for pass_id, which must be used too) in - the logfile name. By default the logfile has the name of the section - (or the section keyword if no section name is given), preceeded by the - log directory (option -L for MCP), and .log appended. If - use_id_in_logfile_name is turned on, then the numeric id is added - before the extension, e.g., /var/log/meta1/mailer0.log for -L /var/log - /meta1/ and a section with the name mailer. - 4. working_directory: perform a chdir(2) to the specified directory - before executing the process. Note: this option essentially requires - that all relevant pathnames in the configuration file are absolute, - otherwise it is very easy to misconfigure some pathnames, especially - those shared between different processes. - -Note: the number of processes for almost all MeTA1 modules should be 1. It -must be 1 for QMGR and SMAR, it can be larger than 1 for SMTPC. For SMTPS -it should be 1 in the default setup as the file descriptor to which MCP -binds on behalf of SMTPS can be passed to only one process. - - -Advanced Configuration for QMGR - - 1. connection_control_hash_table_size: size of the hash table used for - connection control, i.e., number of incoming connections and - connection rate (see Section 3.8, 18a and 18b) - 2. debug_level: debug level (only if compiled with QMGR_DEBUG). - - 3. subsection DEFEDB: Note: The Berkeley DB documentation [Sleb] should - be consulted before modifying any of these options. - 1. page_size: DB page size (this can only be set when the DB is - initially created). - 2. cache_size: DB cache size. - 3. KBytes_written_for_checkpointing: If non-zero, a checkpoint will - be done if more than the amount of KBytes of log data have been - written since the last checkpoint (unit: KB). - 4. delay_between_2_checkpoints: Minimum delay between two checkpoints - (unit: s). - 5. flags: flags for DEFEDB: - i. remove_unused_logfiles: this is on by default, hence to turn - it off one of the forms explained in Section 8.1.1, e.g., - dont_remove_unused_logfiles, can be used. This should only be - done if the Berkeley DB logfiles are removed some other way, - e.g., after archiving. - - 4. delivery_timeout: timeout for a single delivery attempt (unit: s). - This value should be large enough that even big mails can be delivered - over a slow link before the QMGR considers the delivery attempt a - failure because the delivery agent did not return a result yet. - - 5. flags: configuration flags: - a. reuse_connection: try to reuse open SMTP connections for delivery. - Note: this feature is still experimental. - - 6. max_fds: maximum number of file descriptors. This sets an upper limit - on the number of clients that can connect to QMGR. - - 7. max_threads: maximum number of threads. - 8. min_threads: minimum number of threads. - - 9. scheduler_timeout: as a safety measure against unforseen problems an - item is removed from AQ after the specified timeout. This timeout must - be large enough to allow for scheduling delays if all delivery agents - are busy which can happen if deliveries are slow or if there are fewer - delivery agents available than entries in the active queue. - -10. SMAR_timeout: timeout in address resolver, i.e., how long to wait for - a result from SMAR (unit: s). Note: this value must be larger than the - total DNS timeout and it must take alias expansion into account. - -11. subsection smtps: - a. connection_control_cache_size: size of connection control hash - table. - -12. tests: testing only (available if QMGR is compiled with -DQMGR_TEST). - See the source code for details. - - -Advanced Configuration for SMAR - - 1. DNS: this subsection contains DNS related options. - 1. flags: valid flags are: - 1. use_TCP: use TCP instead of UDP for connections to a - nameserver. Note: currently the DNS resolver does not - automatically fall back to a TCP connection if the reply was - too big. This may be added in a later version. - 2. use_connect: use connect(2) even if using UDP. This is - required on systems like FreeBSD jail(8). - - 2. max_fds: maximum number of file descriptors. This sets an upper limit - on the number of clients that can connect to SMAR. - - 3. max_threads: maximum number of threads. - 4. min_threads: minimum number of threads. - - -Advanced Configuration for SMTP Server - - 1. daemon_address: address for daemon to listen on; this should not be - used in normal operation. Current (preliminary) format is: host:port, - :port (listen on 0.0.0.0) host (port defaults to 8000). Up to 16 - addresses^8.1can be specified. See the notes below. - - 2. flags: - 1. background: fork(2) after start; this should not be used in normal - operation. - 2. serialize_accept: serialize accept(2) calls, see the statethreads - documentation [SGI01] for details. - - 3. listen_queue: length of listen(2) queue; this must not be used in - normal operation, i.e., if MCP is used. - - 4. max_wait_threads: maximum number of waiting threads. - 5. min_wait_threads: minimum number of waiting threads. - - 6. module_timeout: timeout for communication with other modules. - - 7. processes: number of processes to start. - - 8. tls: - 1. DSA_cert_file: file with DSA certificate in PEM format. - 2. DSA_key_file: file with private key for DSA certificate in PEM - format. - - 9. wait_for_smar: maximum amount of time to wait for a reply from SMAR. - -Notes: only one of daemon_address and pass_fd_socket must be specified. In -normal operation it is almost always pass_fd_socket because the SMTP -server cannot bind to privileged ports, hence the file descriptor must be -passed from MCP. - - -Advanced Configuration for SMTP Client - - 1. connect_only_to: Specify an IP address to which all outgoing mail is - sent. This can be used for testing with otherwise real data, i.e., - addresses, by running an SMTP sink^8.2on a computer and specifying its - IP address. Then all mails that should be sent via SMTP will go to - that host instead of the addresses determined by SMAR. Note: it is - nevertheless a good idea to use firewall rules to prevent mail going - out to the internet, i.e., prohibit connections to port 25 to external - hosts. - - 2. debug_level: debug level (only if compiled with SMTPC_DEBUG). - - 3. flags: - 1. read_QUIT_reply: read the reply to the QUIT command instead of - just closing the connection after sending it. - 2. separate_final_dot_and_QUIT: send the final dot of a message and - the QUIT command in different TCP packages even if PIPELINING is - offered. This can avoid problems with some broken servers or - firewalls. - 3. talk_to_myself: do not check whether server greets with the - hostname of the machine on which smtpc runs. - - 4. max_wait_threads: maximum number of waiting threads. - 5. min_wait_threads: minimum number of waiting threads. - - 6. module_timeout: timeout for communication with QMGR. - - 7. remote_port: port to which connections should be made. Note: if - multiple SMTP clients are specified, all of them must use the same - value for remote_port. Currently the scheduler requires that all SMTP - clients behave the same. If different ports are required, then those - must be listed in mailertable entries. - - 8. tls: - 1. DSA_cert_file: file with DSA certificate in PEM format. - 2. DSA_key_file: file with private key for DSA certificate in PEM - format. - - -Tuning - - -Size of Queues, Caches, and Databases - -All data structures in QMGR have some maximum size. This is not just done -to avoid resource exhaustion in high load situations but also to provide a -feedback loop between SMTP servers (producers) and SMTP clients -(consumers). This feedback loop helps to avoid flooding the system with -mails that it cannot deliver fast enough. The incoming queue (IQDB) and -the active queue (AQ) implement this feedback loop. As explained in -Section 7.1 the data from the SMTP servers is stored in the incoming queue -first which has a fixed size. If more data is produced than taken out (by -the scheduler into the active queue) the queue will fill up and the QMGR -will throttle the SMTP servers by dynamically reducing the number of -available threads. Throttling the SMTP servers is done based on various -resources, e.g., IQDB, AQ, available disk space, and much more. Hence by -limiting the size of IQDB (see Section 3.8, item 8a) and of course the -maximum number of threads in the SMTP servers the incoming flow of -messages can be controlled. The size of IQDB should be greater than the -maximum number of threads in the SMTP servers multiplied by the average -number of recipients, otherwise transaction will be rejected before all -threads are busy. - -The active queue should be large enough to provide enough work for all -SMTP clients (threads) and it must be larger than the largest number of -recipients accepted by a single transaction (see Section 3.8, item 1). - - -Disk I/O - -In most MTAs disk I/O is the limiting factor unless special hardware is -used which employs battery backed RAM cache to achieve high I/O rates -(IOP: I/O operations). If multiple disks are available, they can be used -to spread the load. Disk files (see Section 2.4.1) are used for: - - 1. IBDB: the directory can be linked to a different disk. - 2. DEFEDB: the base directory can be changed via an option (Section 3.8, - item 4a), as well as the directory for logfiles (Section 3.8, item 4b - ). - 3. CDB: the base directory can be changed via an option (see Section 3.4, - item 2). Individual subdirectories (see Section 2.4.1) can be linked - to different disks. - - -Processes and Threads - -The main MeTA1 processes are multi-threaded. However, two different -threading implementations are used: POSIX threads (pthreads) for QMGR and -SMAR and statethreads [SGI01] for SMTP server and client. Statethreads -only switch between threads on network I/O operations as it is a threading -implementation in user space without kernel support. Hence operations that -can take a long time, e.g., computations for asymmetric cryptography (as -required during the STARTTLS handshake) or in some cases even synchronous -disk I/O, will not just stop a single thread but the entire process. If -this happens it is possible to start multiple SMTP servers, see Section -8.5, item 7. If it becomes necessary to start multiple SMTP clients, then -the MCP can be instructed to do so, see Section 8.2, item 1. - -Format Specifications - - -Socket Map - -The socket map uses a simple request/reply protocol over TCP or UNIX -domain sockets to query an external server. Both requests and replies are -text based and encoded as netstrings, i.e., a string ``hello there'' -becomes: - -11:hello there, - -Note: neither requests nor replies end with CRLF. - -The request consists of the database map name and the lookup key separated -by a space character: - -mapname ' ' key - -The server responds with a status indicator and the result (if any): - -status ' ' result - -The status indicator is one of the following upper case words: - -OK the key was found, result contains the looked up value - -NOTFOUND the key was not found, the result is empty - -TEMP a temporary failure occured - -TIMEOUT a timeout occured on the server side - -PERM a permanent failure occured - -In case of errors (status TEMP, TIMEOUT or PERM) the result field may -contain an explanatory message. - -Example replies: - -31:OK resolved.address@example.com, - -in case of a successful lookup, or: - -8:NOTFOUND, - -in case the key was not found, or: - -55:TEMP this text explains that we had a temporary failure, - -in case of a failure. - - -Format of Session/Transaction Identifiers - -The format of session and transaction identifiers is specified in include/ -sm/mta.h. For the SMTP server it consists of a leading 'S', a 64 bit -counter and an 8 bit ``process'' identifier, both of which are printed in -hexadecimal format. For the SMTP client it consists of a leading 'C', an 8 -bit ``process'' identifier, a 32 bit counter, and a 32 bit thread index, -all of which are printed in hexadecimal format. - -Examples: S00000000407CE49200, C010000137D00000000. - -SMTP server session/transaction identifiers are unique until the 64 bit -counter wraps around, SMTP client session/transaction identifiers are -unique only within a single invocation of QMGR. - -Note: the format may change between different release of MeTA1, hence the -identifiers should be considered opaque. - - -Logfile Format - -The general format of entries in a logfile is a sequence of named fields -which are separated by commas. Each field consists of a name, an equal -sign, and a value. If the value is a text field that is received from an -external (untrusted) source, then all non-printable characters, commas, -and percent signs are shown as their two digit hexadecimal ASCII -representation with a leading percent sign. For example, the text - -550 5.7.1 no, not now, 99% usage - -is encoded as - -550 5.7.1 no%2C not now%2C 99%25 usage - -This encoding allows a logfile analyzer to use the comma symbol as a -delimiter of fields without having to perform complicated parsing, e.g, -the Unix awk utility can be used with comma as field separator. Note: -suggestions for a better encoding or different solution for the problem -are welcome (more details can be found in [Assmb]). - -Logfiles use the identifiers described earlier such that transactions and -sessions can be easily recognized. For the following examples logfile -entries have been slightly edited and line breaks have been inserted. - -Here is one example of a session in an SMTP server: - -ss_sess=S00000000407EAE3800, client_ipv4=127.0.0.1, - client_name=localhost.endmail.org. -ss_sess=S00000000407EAE3800, where=connection, starttls=successful -ss_sess=S00000000407EAE3800, ss_ta=S00000000407EAE4E00, - mail=, stat=0 -ss_sess=S00000000407EAE3800, ss_ta=S00000000407EAE4E00, - rcpt=, idx=0, stat=0 -ss_sess=S00000000407EAE3800, ss_ta=S00000000407EAE4E00, - rcpt=, idx=1, stat=0 -ss_sess=S00000000407EAE3800, ss_ta=S00000000407EAE4E00, - msgid=<20040916050457.GG54961@endmail.org>, size=1177, stat=0 - -The first entry shows a successful session creation including the IPv4 -address and the hostname of the client. The second entry indicates that -STARTTLS has been used. A new transaction is shown in the third entry and -two recipients are given thereafter (along with the index idx). The last -entry shows that the transaction was successful (status=0; 0 is used -instead of 250 or other SMTP reply codes that indicate success) and the -size of the received mail (in bytes) as well as its Message-Id. - -Here is one example of a session in an SMTP client: - -da_sess=C01000006C800000002, status=connected, port=25, addr=64.81.247.36 -da_sess=C01000006C800000002, where=connection, starttls=successful -da_sess=C01000006C800000002, da_ta=C01000006C900000002, - ss_ta=S00000000407EAE4E00, mail=, stat=0, - reply=250 2.5.0 MAIL command succeeded -da_sess=C01000006C800000002, da_ta=C01000006C900000002, - ss_ta=S00000000407EAE4E00, rcpt=, stat=0, - reply=250 2.1.5 RCPT ok -da_sess=C01000006C800000002, da_ta=C01000006C900000002, - ss_ta=S00000000407EAE4E00, where=final_dot, size=1177, stat=0 - -This is very similar to the format of the entries entries in the SMTP -server and should not require an explanation. In addition to the delivery -agent session and transaction ids (da_sess and da_ta) the SMTP server -transaction id (ss_ta) is logged too. This makes it simple to track a -message through the MTA. Obviously ss_ta can be used for multiple outgoing -messages if the incoming message has been sent to multiple recipients -(maybe indirectly via an alias), hence this is not a unique identifier in -the SMTP client log. - -QMGR can also log the delay time for each recipient, e.g., - -func=q_upd_rcpt_ok, rcpt_id=S00000000407EAE4E00-000000, - rcpt=, xdelay=0, delay=1 - -where xdelay is the time for this delivery attempt, and delay is the total -delivery time. - -Format of Received Header - -The format of the Received: header added by the SMTP server is specified -in smtps/smtps.c. - -Received: from EHLO-NAME (CLIENT-NAME [CLIENT-ADDR]) - by HOST-NAME (SM-X-VERSION) with PROTOCOL - id SMTP-TA-ID; DATE - -where PROTOCOL is one of ESMTP, ESMTPS, ESMTPA, ESMTPSA, or SMTP [New04]. -If STARTTLS is active, then (TLS=TLSVERSION, cipher=CIPHERSUITE, bits= -CIPHERBITS, verify=VERIFYRESULT) is placed before id, where TLSVERSION is -the TLS protocol version, e.g., TLSv1, SSLv3, SSLv2; CIPHERSUITE is the -cipher suite that was in use, e.g., AES256-SHA, EDH-DSS-DES-CBC3-SHA, -EDH-RSA-DES-CBC-SHA, CIPHERBITS denotes the effective keylength (in bits) -of the symmetric encryption algorithm of the TLS connection, and -VERIFYRESULT is one of the following: - -OK verification succeeded. - -NO no cert presented. - -NOT no cert requested. - -FAIL cert presented but could not be verified, e.g., the signing CA cert - is missing. - -Note: the name of the client is only shown if the access map feature is -activated (see Section 3.10, 3b), otherwise the time-consuming DNS lookups -(PTR and A records) are not performed. - -Format of DSNs - -DSNs (bounces) are currently not compliant to RFC 1891ff, however, a -configuration option (Section 3.8, item 5(b)ii) can be set to send DSNs in -MIME format, i.e., Content-Type: multipart/mixed with Content-Type: -message/rfc822 for the original message. The format looks like this: - -From: Mailer-Daemon@HOST.NAME -Subject: Undeliverable mail - -A mail from you could not be delivered. See below for details. - -and then a list of recipients and the reasons for the failure, e.g., - -Recipient: - -Remote-MTA: -10.2.3.4 -Reason: -550 5.7.1 ... Access denied -during RCPT - -Setup for STARTTLS - - -Certificates for STARTTLS - -When acting as a server, MeTA1 requires X.509 certificates to support -STARTTLS: one as certificate for the server, at least one root CA -(CAcert_file), i.e., a certificate that is used to sign other -certificates, and a path to a directory which contains certs of other CAs -(CAcert_directory). The file specified via CAcert_file can contain several -certificates of CAs. The DNs of these certificates are sent to the client -during the TLS handshake (as part of the CertificateRequest) as the list -of acceptable CAs. However, do not list too many root CAs in that file, -otherwise the TLS handshake may fail; e.g., - -error:14094417:SSL routines:SSL3_READ_BYTES: -sslv3 alert illegal parameter:s3_pkt.c:964:SSL alert number 47 - -You should probably put only the CA cert into that file that signed your -own cert(s), or at least only those you trust. The directory specified via -CAcert_directory must contain the hashes of each CA certificate as -filenames (or as links to them). Symbolic links can be generated with the -following two (Bourne) shell commands: - -C=FileName_of_CA_Certificate -ln -s $C `openssl x509 -noout -hash < $C`.0 - -An X.509 certificate is also required for authentication in client mode, -however, MeTA1 will always use STARTTLS when offered by a server. The -client and server certificates can be identical. Certificates can be -obtained from a certificate authority or created with the help of OpenSSL. -The required format for certificates and private keys is PEM. To allow for -automatic startup of MeTA1, private keys must be stored unencrypted. The -keys are only protected by the permissions of the file system, hence they -should not be readable by anyone but the owner. If server and client share -the same key it is ok to make the key group readable however. Never make a -private key available to a third party. - --r--r--r-- 1 root wheel CAcert.pem --r--r--r-- 1 meta1s meta1c smcert.pem --r--r----- 1 meta1s meta1c smkey.pem -drwxr-xr-x 2 root wheel certs/ - -More About Configuration, Compilation, Debugging, and Testing - - -Compile Time Options - -There are several compile time parameters which might be useful in some -situations that are listed below. Compile time options to turn on -additional debugging are listed in section 12.1.5. - - -Generic - -To further restrict the length of syslog(3) messages the compile time -options MTA_LOG_LEN and MTA_LOG_LEN_MAX can be used (see libmta/log.c for -the defaults). The macro MTA_LOG_LEN_MAX sets the maximum length of a -syslog(3) message, MTA_LOG_LEN needs only be set if MTA_LOG_LEN_MAX is -less than the default value of MTA_LOG_LEN. - - -QMGR - -To enable QMGR statistics, e.g., number of transactions and recipients -that have been handled, set QMGR_STATS. - - -SMAR - -The address resolver imposes limits on the number of MX and A records that -it accepts when it does routing lookups. These macros are: - - * MTA_DNS_MX_MAX: maximum number of MX records for a domain, - * MTA_DNS_A_PER_MX_MAX: maximum number of A records for one MX record, - * MTA_DNS_A_MAX: maximum number of A records for a domain (after - performing MX lookups). - - -SMTPS - - * SS_EHLO_ACCESS_CHK enables lookups of the EHLO/HELO argument in the - access map (Section 3.10, 3b). This must be enabled at runtime via the - flag check_ehlo. - - -Debugging Compile Time Options - -There are several compile time parameters to support debugging. An option -that applies to all modules (as they use the same libraries) is -MTA_HEAP_CHECK which turns on various heap checks and keep track of memory -usage. - -Other options are specific to a module and can be used to turn on -debugging output. Since currently no logging abstraction is in use, the -output is done on a per-module basis (whatever is simplest for the -individual module). These compile time options are: - -SC_DEBUG SMTPC debugging - -SSQ_DEBUG SMTPS - QMGR communication debugging - -SS_DATA_DEBUG SMTPS DATA stage debugging - -QMGR_DEBUG QMGR debugging - -SMAR_DEBUG SMAR debugging - -MTA_LIBDNS_DEBUG libdns debugging - -For details see the source code. - -Note: it is possible to set different debug levels for different debug -categories in QMGR. For a list of categories see include/sm/qmgrdbg.h. To -set a debug level n for a category c use the option -xc.n. The general -syntax for the parameters is: - -debugoptions ::= debugoption [ "," debugoptions ] - -debugoption ::= range [ "." level ] - -range ::= first [ "-" last ] - -If level is omitted, it defaults to 1. Example: -x1-3.4,5.3,9-11 - -A simple way to set compile time options is to use: - -$ CFLAGS="-DSM_HEAP_CHECK" $PATHTO/meta1-$VERSION/configure - -A more complicated example is: - -$ CFLAGS="-O -g -DSM_HEAP_CHECK -I/usr/local/include" \ - LDFLAGS="-L/usr/local/lib" \ - $PATHTO/meta1-$VERSION/configure - -Hint: it is useful to write the command line into a local file that can be -reused for subsequent builds and versions. - -Note: if configure has problems with OpenSSL because you do not have -KerberosV installed, add - -$ CPPFLAGS="-DOPENSSL_NO_KRB5" - -Possible Compilation Problems or Warnings - - 1. If gcc is used as C compiler and full checking is turned on warnings - like these are produced: - - warning: unknown conversion type character `N' in format - warning: unsigned int format, sm_str_P arg (arg 3) - warning: too many arguments for format - - Unfortunately gcc cannot be told about additional format specifiers - and hence the misleading warning might be generated. - - 2. On some systems the following warning is generated by the compiler: - - `sys_nerr' is deprecated; use `strerror' or `strerror_r' instead - - sys_nerr is used to determine whether it makes sense to invoke - strerror(3) at all. The systems that generate this error do not - provide an alternative way to perform this check. Just ignore the - warning or ask the authors of that warning for an alternative way to - determine the range of defined error codes. - - -More About Test Programs - - -More Environment Variables used by Test Programs - - * MTA_NAMESERVER: can be used to set a specific nameserver (IPv4 - address) in case the simple script which extracts the first line - beginning with nameserver from the file /etc/resolv.conf does not give - the desired result. - - * MTA_PMILTER_REGEX_TEST: can be used to enable the tests (make check in - chkmts/) for the policy milter milter-regex provided it is enabled and - compiled. Notes: - + this requires that make check is executed in contrib/ before make - check in chkmts/. - + make check in contrib/ may fail due to a compilation error for - milter-regex.c. If your OS has yacc(1) (or bison(1) installed then - remove that file (milter-regex.c) and try again. You may have to - tell configure to use yacc(1), e.g., - - YACC=yacc ./configure ... - - * Some test programs use SMTP servers and sinks listening on an INET - port. The default values for these ports are specified in chkmts/ - common.sh. If one of the default ports is used by another program, - then the corresponding environment variable must be set as otherwise - all related test programs will fail. - - + MTA_SNKPORT: set the port on which the SMTP sink is listening. - - + MTA_SRVPORT: set the port on which the SMTP test server is - listening. - - -Other Potential Problems with Test Programs - -Some of the test programs may generate warnings, e.g., most of the tree -related programs cause compilers on 32 bit systems to emit a warning -integer constant too large which can be ignored. - - -Known Test Program Problems specific to an OS/setup - -FreeBSD systems when running in a jail(8) exhibit the following problems: - - * The test programs for SMAR which perform DNS lookups can fail because - UDP does not work in a jail(8) as expected. A workaround for this is - to use the -U option for smar which can be achieved by setting the - environment variable SMAROPTS to that value. - - * Connections from localhost to the SMTP server do not have 127.0.0.1 as - source IP address, but the IP address of a NIC. Hence relaying must be - allowed for it by setting the environment variable MTA_SERVER_OPTIONS - to the option -C and the IP address, e.g., -C 10.2.3.4. Moreover, - because the tests chkmts/t-mts-icr.sh and chkmts/t-mts-ocr.sh rely on - connections coming from 127.0.0.1 they will fail too. - -MacOS 10.3.4 has a problem with sigwait(3), see Apple's bug 3675391; hence -MeTA1 does not work on this OS (and other versions that have the same -bug). - -Licenses - -The main licenses for MeTA1 can be found in the file LICENSE and in the -directory license/. Additionally, MeTA1 contains code from other projects -whose licenses can be either found in the respective source files or in -statethreads/README for the statethreads library and db-4.3.28.NC/LICENSE -for Berkeley DB. Some source code is licensed under a BSD license which -can be found at the begin of those files. - -Bibliography - - -Assma - Claus Assmann. - Sendmail X. - http://www.sendmail.org/%7Eca/email/sm-9-rfh.html. - -Assmb - Claus Assmann. - Sendmail X: Requirements, Architecture, Functional Specification, - Implementation, and Performance. - http://www.sendmail.org/%7Eca/email/sm-X/. - -Ber97 - Dan Bernstein. - VERP: Variable Envelope Return Paths, 1997. - http://cr.yp.to/proto/verp.txt. - -Cyr Project Cyrus. - http://asg.web.cmu.edu/cyrus/, http://asg.web.cmu.edu/sasl/. - -Fre00 - N. Freed. - SMTP service extension for command pipelining. - RFC 2920, Internet Engineering Task Force, 2000. - -Gnu GnuPG. - GNU Privacy Guard. - http://www.gnupg.org/. - -Hal07 - Eric A. Hall. - Smtp service extension for per-recipient data responses (prdr). - Draft, Internet Engineering Task Force, 2007. - -Hara - Evan Harris. - The next step in the spam control war: Greylisting. - http://greylisting.org/articles/whitepaper.shtml. - -Harb - Evan Harris. - Whitelisting. - http://greylisting.org/whitelisting.shtml. - -Harc - Daniel Hartmeier. - benzedrine.cx - milter-spamd. - http://www.benzedrine.cx/milter-spamd.html. - -Hof99 - P. Hoffman. - SMTP service extension for secure SMTP over TLS. - RFC 2487, Internet Engineering Task Force, 1999. - -Kle01 - Simple mail transfer protocol. - RFC 2821, Internet Engineering Task Force, 2001. - -MeT PGP keys. - http://www.MeTA1.org/security/PGPKEYS. - -Moc87 - P.V. Mockapetris. - Domain names - implementation and specification. - RFC 1035, Internet Engineering Task Force, 1987. - -mut mutt. - http://www.mutt.org/. - -MV03 - K. Moore and G. Vaudreuil. - An Extensible Message Format for Delivery Status Notifications. - RFC 3464, Internet Engineering Task Force, 2003. - -Mye96 - John Myers. - Local mail transfer protocol. - RFC 2033, Internet Engineering Task Force, 1996. - -Mye99 - J. Myers. - SMTP service extension for authentication. - RFC 2554, Internet Engineering Task Force, 1999. - -New04 - Chris Newman. - ESMTP and LMTP Transmission Types Registration. - RFC 3848, Internet Engineering Task Force, 2004. - -Ope OpenSSL. - http://www.openssl.org/. - -PGP PGP. - http://www.pgp.com/. - -Posa - Jef Poskanzer. - graymilter - simple graylist mail filter module. - http://www.acme.com/software/graymilter/. - -Posb - Jef Poskanzer. - mini_sendmail - accept email on behalf of real sendmail. - http://www.acme.com/software/mini_sendmail/. - -SGI01 - SGI. - State threads for internet applications, 2001. - http://state-threads.sourceforge.net/. - -Slea - Berkeley DB 4.4.XX Change Log. - http://www.sleepycat.com/update/4.4.XX/if.4.4.XX.html. - -Sleb - Berkeley DB Tutorial and Reference Guide, version 4.3.28. - http://www.sleepycat.com/docs/. - -Tok Michael Tokarev. - tinycdb: A package for maintenance of constant databases. - ftp://ftp.corpit.ru/pub/tinycdb/. - -Vau03 - G. Vaudreuil. - Enhanced mail system status codes. - RFC 3463, Internet Engineering Task Force, 2003. - -vdBG - S.R. van den Berg and Philip Guenther. - procmail. - http://www.procmail.org/. - - -Index - -8bitmime - Configuration for SMTP Server -abort - Configuration for SMTP Server -accept_but_reconnect - Configuration for SMTP Server -access - Configuration for SMTP Server -access_map - Configuration Options for SMAR -address - Configuration for MCP | Declaring Maps for SMAR | Configuration for - SMTP Server -address_delimiter - Configuration Options for SMAR -aliases - Configuration Options for SMAR -all_domains - Configuration Options for SMAR -allow_by - Configuration for SMTP Server -allow_data_before_greeting - Configuration for SMTP Server -allow_relaying_if_verified - Configuration for SMTP Server -AQ_max_entries - Configuration for QMGR -arguments - Configuration for MCP -auth - Configuration for SMTP Server -background - Advanced Configuration for SMTP -base_directory - Configuration for QMGR -CAcert_directory - Configuration for SMTP Server | Configuration for SMTP Client -CAcert_file - Configuration for SMTP Server | Configuration for SMTP Client -cache_size - Configuration for SMTP Server | Advanced Configuration for QMGR -cache_timeout - Configuration for SMTP Server -CDB_base_directory - Common Global Configuration -CDB_gid - Configuration for SMTP Server -cert_file - Configuration for SMTP Server | Configuration for SMTP Client -check_access_map_for_relaying - Configuration for SMTP Server -client_ip - Configuration for SMTP Server -conf - Configuration for QMGR -connect_only_to - Advanced Configuration for SMTP -connection_control_cache_size - Advanced Configuration for QMGR -connection_control_hash_table_size - Advanced Configuration for QMGR -control_socket - Configuration for QMGR -daemon_address - Advanced Configuration for SMTP -debug_level - Advanced Configuration for QMGR | Advanced Configuration for SMTP -delay_between_2_checkpoints - Advanced Configuration for QMGR -delay_checks - Configuration for SMTP Server -delay_greylisting_error_until_DATA - Configuration for SMTP Server -delivery_timeout - Advanced Configuration for QMGR -DNS Configuration Options for SMAR | Advanced Configuration for SMAR -dnsbl - Configuration Options for SMAR -domain - Configuration Options for SMAR -double_bounce_address - Configuration for QMGR -DSA_cert_file - Advanced Configuration for SMTP | Advanced Configuration for SMTP -DSA_key_file - Advanced Configuration for SMTP | Advanced Configuration for SMTP -expire_limit - Configuration Options for SMAR -facility - Common Configuration Options -file - Declaring Maps for SMAR | Configuration Options for SMAR | - Configuration Options for SMAR | Configuration Options for SMAR -flags - Configuration for QMGR | Configuration for QMGR | Configuration - Options for SMAR | Configuration Options for SMAR | Configuration - Options for SMAR | Configuration Options for SMAR | Configuration for - SMTP Server | Configuration for SMTP Server | Configuration for SMTP - Server | Advanced Configuration for QMGR | Advanced Configuration for - QMGR | Advanced Configuration for SMAR | Advanced Configuration for - SMTP | Advanced Configuration for SMTP -generic_lookup - Configuration for SMTP Server -grey_expire - Configuration Options for SMAR -grey_wait - Configuration Options for SMAR -greylisting - Configuration Options for SMAR | Configuration for SMTP Server -group - Configuration for MCP | Configuration for MCP -hash_table_entries - Configuration for QMGR -header_only - Configuration for QMGR -hostname - Common Global Configuration -id Configuration for SMTP Server -ident - Common Configuration Options -implicitly_match_detail - Configuration Options for SMAR | Configuration Options for SMAR | - Configuration for SMTP Server -initial_connections - Configuration for QMGR -io_timeout - Configuration for SMTP Server | Configuration for SMTP Client -KBytes_written_for_checkpointing - Advanced Configuration for QMGR -key_file - Configuration for SMTP Server | Configuration for SMTP Client -listen_queue - Advanced Configuration for SMTP -listen_socket - Configuration for MCP -lmtp_does_not_imply_relaying - Configuration for SMTP Server -lmtp_max_rcpts_per_transaction - Configuration for QMGR -LMTP_socket - Configuration for SMTP Client -local_domains - Configuration Options for SMAR -local_user_map - Configuration Options for SMAR -localpart - Configuration Options for SMAR -log Common Configuration Options -log_directory - Configuration for QMGR -log_level - Configuration for QMGR | Configuration Options for SMAR | - Configuration for SMTP Client -lookup_rcpt_conf - Configuration for QMGR -lookup_session_conf - Configuration for QMGR | Configuration for SMTP Server -mailertable - Configuration Options for SMAR -main_DB_name - Configuration Options for SMAR -mapname - Declaring Maps for SMAR -maps - Declaring Maps for SMAR -match_type - Configuration for SMTP Server -max_bad_commands_per_session - Configuration for SMTP Server -max_bad_commands_per_transaction - Configuration for SMTP Server -max_cache_entries - Configuration for QMGR -max_commit_delay - Configuration for QMGR -max_connection_rate - Configuration for QMGR -max_connections - Configuration for QMGR | Configuration for QMGR -max_errors_per_DSN - Configuration for QMGR -max_fds - Advanced Configuration for QMGR | Advanced Configuration for SMAR -max_hops - Configuration for SMTP Server -max_invalid_addresses_per_session - Configuration for SMTP Server -max_invalid_addresses_per_transaction - Configuration for SMTP Server -max_message_size - Configuration for SMTP Server -max_nop_commands_between_transactions - Configuration for SMTP Server -max_nop_commands_in_transaction - Configuration for SMTP Server -max_open_TAs - Configuration for QMGR -max_processes - Advanced Configuration for MCP -max_recipients_per_session - Configuration for SMTP Server -max_recipients_per_transaction - Configuration for SMTP Server -max_threads - Configuration for SMTP Server | Advanced Configuration for QMGR | - Advanced Configuration for SMAR -max_transactions - Configuration for SMTP Server -max_wait_threads - Advanced Configuration for SMTP | Advanced Configuration for SMTP -merge_delay_max - Configuration for QMGR -MIME_Format - Configuration for QMGR -min_disk_space - Configuration for QMGR -min_processes - Advanced Configuration for MCP -min_threads - Advanced Configuration for QMGR | Advanced Configuration for SMAR -min_wait_threads - Advanced Configuration for SMTP | Advanced Configuration for SMTP -module_timeout - Advanced Configuration for SMTP | Advanced Configuration for SMTP -MTA Installing MeTA1 -MTA_DNS_TIMEOUT - Environment Variables used by -MTA_NAMESERVER - More Environment Variables used -MTA_NO_DNS_TEST - Environment Variables used by -MTA_NO_LOG_TEST - Environment Variables used by -MTA_NO_SLOW_TEST - Environment Variables used by -MTA_PMILTER_REGEX_TEST - More Environment Variables used -MTA_SNKPORT - More Environment Variables used -MTA_SRVPORT - More Environment Variables used -MTA_STOPONERROR - Environment Variables used by -MTA_TEST_DNS_TIMING - Environment Variables used by -MTA_TIMING - Environment Variables used by -MTAC - Installing MeTA1 -MTACONFDIR - Installing MeTA1 -MTALG - Installing MeTA1 -MTALOGDIR - Installing MeTA1 -MTAM - Installing MeTA1 -MTAQ - Installing MeTA1 -MTAQDIR - Installing MeTA1 -MTAS - Installing MeTA1 -name - Configuration Options for SMAR | Configuration Options for SMAR | - Configuration Options for SMAR | Configuration Options for SMAR -nameservers - Configuration Options for SMAR -netmask - Configuration Options for SMAR -OCC_max_entries - Configuration for QMGR -ok_disk_space - Configuration for QMGR -options - Common Configuration Options -page_size - Advanced Configuration for QMGR -pass_fd_socket - Configuration for MCP -pass_id - Configuration for MCP -path - Configuration for MCP | Configuration for MCP | Declaring Maps for - SMAR | Configuration for SMTP Server -policy_milter - Configuration for SMTP Server -port - Configuration for MCP | Declaring Maps for SMAR | Configuration for - SMTP Server -prdr - Configuration for SMTP Server -preserve_domain - Configuration Options for SMAR -processes - Configuration for SMTP Server | Advanced Configuration for SMTP -protected_recipients - Configuration for SMTP Server -queue_delay_timeout - Configuration for QMGR -queue_return_timeout - Configuration for QMGR -rcpt_conf_lookup_flags - Configuration for QMGR -read_QUIT_reply - Advanced Configuration for SMTP -remote_port - Advanced Configuration for SMTP -remove_unused_logfiles - Advanced Configuration for QMGR -replace_macros - Configuration Options for SMAR -require_EHLO_before_MAIL - Configuration for SMTP Server -requirements_violation - Configuration for SMTP Server -restart_dependencies - Configuration for MCP -retries - Configuration Options for SMAR -retry_max_delay - Configuration for QMGR -retry_min_delay - Configuration for QMGR -reuse_connection - Advanced Configuration for QMGR -scheduler_timeout - Advanced Configuration for QMGR -secondary_DB_name - Configuration Options for SMAR -sender - Configuration for SMTP Server -separate_final_dot_and_QUIT - Advanced Configuration for SMTP -serialize_accept - Advanced Configuration for SMTP -session_features - Configuration for SMTP Server -size - Configuration for QMGR -SMAR_socket - Common Global Configuration -SMAR_timeout - Advanced Configuration for QMGR -smtp_max_rcpts_per_transaction - Configuration for QMGR -SMTPC_socket - Common Global Configuration -SMTPS_socket - Common Global Configuration -socket - Configuration for SMTP Server -soft_bounce - Configuration for SMTP Server -start_action - Configuration for MCP -strict_EHLO_checks - Configuration for SMTP Server -tag Configuration Options for SMAR -talk_to_myself - Advanced Configuration for SMTP -tests - Advanced Configuration for QMGR -timeout - Configuration Options for SMAR | Configuration for SMTP Server -tls Configuration for SMTP Server | Configuration for SMTP Client | - Advanced Configuration for SMTP | Advanced Configuration for SMTP -trusted_mechanisms - Configuration for SMTP Server -type - Declaring Maps for SMAR -umask - Configuration for MCP -use_connect - Advanced Configuration for SMAR -use_id_in_logfile_name - Advanced Configuration for MCP -use_resolvconf - Configuration Options for SMAR -use_TCP - Advanced Configuration for SMAR -user - Configuration for MCP | Configuration for MCP -wait_for_client - Configuration for QMGR -wait_for_server - Configuration for QMGR | Configuration for SMTP Client -wait_for_smar - Advanced Configuration for SMTP -white_expire - Configuration Options for SMAR -white_timeout - Configuration Options for SMAR -working_directory - Advanced Configuration for MCP -xverp - Configuration for SMTP Server - - --------------------------------------------------------------------------- - -Footnotes - -... databases^1.1 - the term database is used loosely here -... to^1.2 - Sorry for the obfuscation, replace (at) with @ and remove the spaces, - but not the plus sign. -... commands^2.1 - using script(1) or redirecting it to some file. -... configurations^2.2 - ``Private database environments on 64-bit machines no longer drop core - because of 64-bit address truncation. [11983]'' [Slea] -...passwd(5)^2.3 - On some systems the man page is in another section, e.g., 4. -... comma^3.1 - A trailing comma is allowed to make writing of lists simpler. -... addresses^3.2 - 4 is the default value for the compile time option MTA_DNS_MAX_TSKS -... answer^3.3 - This needs to be enhanced in a later version, a patch is welcome! -... blacklist^3.4 - This option is modelled after dnsblaccess written by Neil Rickert for - sendmail 8. -... times^3.5 - Compile time option MTA_MAX_DNSBL: currently set to 8. -... lmtp:^4.1 - currently internally encoded as 127.0.0.255 -... patch^4.2 - if the patch fails to apply, make sure you use a working patch(1) - program, e.g., most SunOS 5.x versions ship with a broken program -... errors^4.3 - See egrep(1) for the correct syntax for word delimiters on your OS. -... databases^7.1 - the term database is used loosely here, only DEFEDB is a real - database, the others are just ways to store some information and - access them in some way. -... storage^7.2 - If non-persistent storage is used for these databases mail can of - course be lost. -... addresses^8.1 - Compile time option SS_MAX_BIND_ADDRS -... sink^8.2 - For example, statethreads/examples/smtps2 - - --------------------------------------------------------------------------- - -Claus Assmann 2008-02-04 diff --git a/include/sm/map.h b/include/sm/map.h index c764fbc..35290bb 100644 --- a/include/sm/map.h +++ b/include/sm/map.h @@ -92,6 +92,13 @@ struct sm_map_cursor_S #define SMPO_INIT_CB (0x0200|SMPO_PTR) /* init cb function (hash map) */ +/* Additional flags for sockmap spools: */ +#define SMPO_MIN_OCONN (0x0300|SMPO_INT) /* Minimal number of open + connections */ +#define SMPO_MAX_OCONN (0x0400|SMPO_INT) /* Maximum number of open + connections */ +#define SMPO_IDLE (0x0500|SMPO_INT) /* Idle timeout */ + #define SMPO_TYPE_MASK 0x0000F #define SMPO_GET_TYPE(opt) ((opt) & SMPO_TYPE_MASK) diff --git a/include/sm/mapcnf.h b/include/sm/mapcnf.h index b0a774c..4e6311c 100644 --- a/include/sm/mapcnf.h +++ b/include/sm/mapcnf.h @@ -73,6 +73,8 @@ struct mst_socket_S ipv4_T mst_socket_ipv4; short mst_socket_port; sm_intvl_T mst_socket_tmout; + uint mst_socket_min_oconn; + uint mst_socket_max_oconn; }; typedef struct mst_socket_S mst_socket_T; diff --git a/include/sm/mapcnfdef.h b/include/sm/mapcnfdef.h index af4ffbf..75fcd52 100644 --- a/include/sm/mapcnfdef.h +++ b/include/sm/mapcnfdef.h @@ -157,6 +157,24 @@ mst_socket_defs[] 0, NULL, NULL, NULL, NULL SM_LC_NO_ISSET SM_LC_SET_MAGIC(0) }, +{ SM_CONF_DEF_MAGIC, "min_connections", sm_conf_type_u32, + offsetof(mapspec_T, mst_socket.mst_socket_min_oconn), sizeof(uint), + NULL, + 0, NULL, NULL, NULL, NULL + SM_LC_NO_ISSET SM_LC_SET_MAGIC(0) }, + +{ SM_CONF_DEF_MAGIC, "max_connections", sm_conf_type_u32, + offsetof(mapspec_T, mst_socket.mst_socket_max_oconn), sizeof(uint), + NULL, + 0, NULL, NULL, NULL, NULL + SM_LC_NO_ISSET SM_LC_SET_MAGIC(0) }, + +{ SM_CONF_DEF_MAGIC, "timeout", sm_conf_type_u32, + offsetof(mapspec_T, mst_socket.mst_socket_tmout), sizeof(sm_intvl_T), + NULL, + 0, NULL, NULL, NULL, NULL + SM_LC_NO_ISSET SM_LC_SET_MAGIC(0) }, + /* Sentinel */ { SM_CONF_DEF_MAGIC, NULL, 0, 0, 0, NULL, 0, NULL, NULL, NULL, NULL SM_LC_NO_ISSET SM_LC_SET_MAGIC(0)} } diff --git a/libsmmap/Makefile.am b/libsmmap/Makefile.am index c270076..1aa7fe5 100644 --- a/libsmmap/Makefile.am +++ b/libsmmap/Makefile.am @@ -83,6 +83,7 @@ TESTP= t-mapr-0 \ ## TESTC= t-mapipr-0 t-mapdomr-0 t-mapip-0 t-mapdom-0 TESTC= t-mm \ t-sockmapr-0 \ + t-sockmapr-1 \ t-mapipr-0 \ t-mapdomr-0 \ t-mapaddrr-0 \ @@ -216,6 +217,12 @@ t_sockmapr_0_LDADD = $(LDSMMAPSR) $(LDCSTRR) $(LDADDR) $(LDCHK) $(PTHREAD_LIBS) t_sockmapr_0_CFLAGS=-DMTA_USE_PTHREADS $(PTHREAD_CFLAGS) t_sockmapr_0_LDFLAGS=$(PTHREAD_CFLAGS) +t_sockmapr_1_CC = $(PTHREAD_CC) +t_sockmapr_1_SOURCES = t-sockmap-1.c +t_sockmapr_1_LDADD = $(LDSMMAPSR) $(LDCSTRR) $(LDADDR) $(LDCHK) $(PTHREAD_LIBS) $(LDREPL) +t_sockmapr_1_CFLAGS=-DMTA_USE_PTHREADS $(PTHREAD_CFLAGS) +t_sockmapr_1_LDFLAGS=$(PTHREAD_CFLAGS) + t_seqr_0_CC = $(PTHREAD_CC) t_seqr_0_SOURCES = t-seq-0.c t_seqr_0_LDADD = $(LDSMMAPSR) $(LDCSTRR) $(LDADDR) $(LDCHK) $(PTHREAD_LIBS) $(LDREPL) diff --git a/libsmmap/mapconfopen.c b/libsmmap/mapconfopen.c index 9f7cbf9..1172220 100644 --- a/libsmmap/mapconfopen.c +++ b/libsmmap/mapconfopen.c @@ -99,6 +99,8 @@ sm_mapconfopen(map_decl_P mapdef, sm_maps_P maps, const char *confdir) md_maps->mst_socket.mst_socket_path, SMPO_PORT, md_maps->mst_socket.mst_socket_port, SMPO_IPV4, md_maps->mst_socket.mst_socket_ipv4, + SMPO_MIN_OCONN, md_maps->mst_socket.mst_socket_min_oconn, + SMPO_MAX_OCONN, md_maps->mst_socket.mst_socket_max_oconn, SMPO_END); break; diff --git a/libsmmap/sockmap.c b/libsmmap/sockmap.c index 0bbb514..2cbc154 100644 --- a/libsmmap/sockmap.c +++ b/libsmmap/sockmap.c @@ -61,32 +61,11 @@ sm_sockmap_destroy(sm_map_P map, uint32_t flags) return ret; } -/* -** SM_SOCKMAP_SETOPT -- set options for map -** -** Parameters: -** map -- map -** ap -- options -** -** Returns: -** usual sm_error code -*/ - static sm_ret_T -sm_sockmap_setopt(sm_map_P map, va_list ap) +__sockmap_setopt(sm_sockmap_P db, va_list ap) { - sm_ret_T ret; - uint k, u; - sm_sockmap_P db; - - SM_IS_MAP(map); - db = (sm_sockmap_P) map->sm_map_db; - if (NULL == db) - return sm_error_perm(SM_EM_MAP, ENOENT); - ret = SM_SUCCESS; - for (;;) { - k = va_arg(ap, uint); + uint u, k = va_arg(ap, uint); if (SMPO_END == k) break; @@ -105,12 +84,50 @@ sm_sockmap_setopt(sm_map_P map, va_list ap) case SMPO_SOCKPATH: db->sockmap_path = va_arg(ap, char *); break; + case SMPO_MIN_OCONN: + db->sockmap_min = va_arg(ap, uint); + break; + case SMPO_MAX_OCONN: + db->sockmap_max = va_arg(ap, uint); + break; + case SMPO_IDLE: + db->sockmap_idle = va_arg(ap, sm_intvl_T); + break; default: /* silently ignore bogus options? */ break; } } - return ret; + if (db->sockmap_min < 1) + db->sockmap_min = 1; + if (db->sockmap_max < 1) + db->sockmap_max = 1; + if (db->sockmap_max < db->sockmap_min) + db->sockmap_max = db->sockmap_min; + return SM_SUCCESS; +} + +/* +** SM_SOCKMAP_SETOPT -- set options for map +** +** Parameters: +** map -- map +** ap -- options +** +** Returns: +** usual sm_error code +*/ + +static sm_ret_T +sm_sockmap_setopt(sm_map_P map, va_list ap) +{ + sm_sockmap_P db; + + SM_IS_MAP(map); + db = (sm_sockmap_P) map->sm_map_db; + if (NULL == db) + return sm_error_perm(SM_EM_MAP, ENOENT); + return __sockmap_setopt(db, ap); } /* @@ -226,28 +243,9 @@ sm_sockmap_open(sm_mapc_P mapc, const sm_cstr_P type, uint32_t flags, const char db = map->sm_map_db; SM_REQUIRE(db != NULL); db->sockmap_name = name; - for (;;) { - k = va_arg(ap, uint); - if (SMPO_END == k) - break; - - switch (k) { - case SMPO_SOCKPATH: - db->sockmap_path = va_arg(ap, char *); - break; - case SMPO_PORT: - u = va_arg(ap, int); - db->sockmap_port = (short) u; - break; - case SMPO_IPV4: - u = va_arg(ap, ipv4_T); - db->sockmap_ipv4 = u; - break; - default: - /* silently ignore bogus options? */ - break; - } - } + ret = __sockmap_setopt(db, ap); + if (sm_is_err(ret)) + goto error; ret = sockmap_open(db); if (sm_is_err(ret)) goto error; @@ -344,11 +342,6 @@ sm_sockmap_lookup(sm_map_P map, uint32_t flags, sm_map_key_P key, sm_map_data_P ret = sockmap_lookup(db, key, data); - /* this doesn't look right: violation of abstraction... */ - if (sm_is_err(ret) && NULL == db->sockmap_fp) { - SMMAP_CLR_FL(map, SMMAP_FL_OPEN); - SMMAP_SET_FL(map, SMMAP_FL_CLOSED); - } return ret; } @@ -416,7 +409,7 @@ sm_sockmap_class_create(sm_maps_P maps) if (NULL == htype) goto error; - ret = sm_mapc_create(maps, htype, SMMAPC_FL_LCK_FULL, + ret = sm_mapc_create(maps, htype, 0, sm_sockmap_create, sm_sockmap_open, sm_sockmap_close, diff --git a/libsmmap/sockmap.h b/libsmmap/sockmap.h index 07107cd..18f1ca0 100644 --- a/libsmmap/sockmap.h +++ b/libsmmap/sockmap.h @@ -22,10 +22,25 @@ /* arbitrary limit for sanity */ #define SOCKETMAP_MAXL 1000000 +struct sm_sockmap_instance_S +{ +#if MTA_USE_PTHREADS + pthread_rwlock_t rwlock; +#endif + sm_file_T *fp; + uint busy; +}; + typedef struct sm_sockmap_S sm_sockmap_T, *sm_sockmap_P; struct sm_sockmap_S { - sm_file_T *sockmap_fp; +#if MTA_USE_PTHREADS + pthread_rwlock_t sockmap_lock; +#endif + struct sm_sockmap_instance_S *sockmap_inst; + sm_intvl_T sockmap_min; + sm_intvl_T sockmap_max; + sm_intvl_T sockmap_idle; const char *sockmap_name; const char *sockmap_path; ipv4_T sockmap_ipv4; diff --git a/libsmmap/sockmapimpl.c b/libsmmap/sockmapimpl.c index 38ee1a0..78fecba 100644 --- a/libsmmap/sockmapimpl.c +++ b/libsmmap/sockmapimpl.c @@ -19,167 +19,177 @@ SM_RCSID("@(#)$Id: sockmapimpl.c,v 1.15 2008/02/10 04:54:39 ca Exp $") /* --------- socket map basic implementation ------ */ -/* -** SOCKMAP_FREE -- free socket map context -** -** Parameters: -** db -- pointer to socket map -** -** Returns: -** usual sm_error code -*/ +#if MTA_USE_PTHREADS +# define SOCKMAP_LOCK_INIT(map) \ + pthread_rwlock_init(&(map)->sockmap_lock, NULL) +# define SOCKMAP_LOCK_DESTROY(map) \ + pthread_rwlock_destroy(&(map)->sockmap_lock) +# define SOCKMAP_LOCK(map) do { \ + int r = pthread_rwlock_wrlock(&(map)->sockmap_lock); \ + if (r != 0) \ + return sm_error_perm(SM_EM_MAP, r); \ + } while(0) +# define SOCKMAP_UNLOCK(map) do { \ + int r = pthread_rwlock_unlock(&(map)->sockmap_lock); \ + if (r != 0) \ + return sm_error_perm(SM_EM_MAP, r); \ + } while(0) +# define SOCKMAP_INST_LOCK_INIT(map, i) \ + pthread_rwlock_init(&(map)->sockmap_inst[i].rwlock, NULL) +# define SOCKMAP_INST_LOCK_DESTROY(map, i) \ + pthread_rwlock_destroy(&(map)->sockmap_inst[i].rwlock) +# define SOCKMAP_INST_LOCK(map, i) do { \ + int r = pthread_rwlock_wrlock(&(map)->sockmap_inst[i].rwlock); \ + if (r != 0) \ + return sm_error_perm(SM_EM_MAP, r); \ + } while(0) +# define SOCKMAP_INST_UNLOCK(map, i) do { \ + int r = pthread_rwlock_unlock(&(map)->sockmap_inst[i].rwlock); \ + if (r != 0) \ + return sm_error_perm(SM_EM_MAP, r); \ + } while(0) +#else +# define SOCKMAP_LOCK_INIT(map) 0 +# define SOCKMAP_LOCK_DESTROY(map) 0 +# define SOCKMAP_LOCK(map) +# define SOCKMAP_UNLOCK(map) +# define SOCKMAP_INST_LOCK_INIT(map, i) 0 +# define SOCKMAP_INST_LOCK_DESTROY(map, i) 0 +# define SOCKMAP_INST_LOCK(map, i) +# define SOCKMAP_INST_UNLOCK(map, i) +#endif -sm_ret_T -sockmap_free(sm_sockmap_P db) +static sm_ret_T +sockmap_init_all_instances(sm_sockmap_P db) { - if (db != NULL) - sm_free_size(db, sizeof(*db)); - return SM_SUCCESS; -} - -/* -** SOCKMAP_NEW -- allocate socket map context -** -** Parameters: -** pdb -- pointer to pointer to socket map -** -** Returns: -** usual sm_error code -*/ - -sm_ret_T -sockmap_new(sm_sockmap_P *pdb) -{ - sm_sockmap_P db; - - SM_REQUIRE(pdb != NULL); - *pdb = NULL; - db = sm_zalloc(sizeof(*db)); - if (db == NULL) + uint i; + db->sockmap_inst = sm_zalloc(db->sockmap_max + * sizeof(db->sockmap_inst[0])); + if (!db->sockmap_inst) return sm_error_perm(SM_EM_MAP, ENOMEM); - - /* default for socket map timeout */ - db->sockmap_tmout = 5; - *pdb = db; + + for (i = 0; i < db->sockmap_max; i++) + SOCKMAP_INST_LOCK_INIT(db, i); return SM_SUCCESS; } - -/* -** SOCKMAP_DESTROY -- destroy socket map -** -** Parameters: -** pdb -- pointer to pointer to socket map -** -** Returns: -** usual sm_error code -*/ - -sm_ret_T -sockmap_destroy(sm_sockmap_P *pdb) + +static sm_ret_T +sockmap_close_instance(sm_sockmap_P db, uint i) { - sm_ret_T ret; - - SM_REQUIRE(pdb != NULL); - ret = SM_SUCCESS; - if (*pdb != NULL) - { - if ((*pdb)->sockmap_fp != NULL) - { - ret = sm_io_close((*pdb)->sockmap_fp, SM_IO_CF_NONE); - (*pdb)->sockmap_fp = NULL; - } - sockmap_free(*pdb); - *pdb = NULL; + sm_ret_T ret = SM_SUCCESS; + struct sm_sockmap_instance_S *smp = db->sockmap_inst + i; + if (smp->fp) { + ret = sm_io_close(smp->fp, SM_IO_CF_NONE); + smp->fp = NULL; + smp->busy = 0; } return ret; } -/* -** SOCKMAP_CLOSE -- close socket map -** -** Parameters: -** db -- pointer to socket map -** -** Returns: -** usual sm_error code -*/ - -sm_ret_T -sockmap_close(sm_sockmap_P db) -{ - sm_ret_T ret; - - ret = SM_SUCCESS; - if (db != NULL && db->sockmap_fp != NULL) - { - ret = sm_io_close(db->sockmap_fp, SM_IO_CF_NONE); - db->sockmap_fp = NULL; - } - return ret; -} - -/* -** SOCKMAP_OPEN -- open socket map -** -** Parameters: -** pdb -- pointer to pointer to socket map -** -** Returns: -** usual sm_error code -*/ - -sm_ret_T -sockmap_open(sm_sockmap_P db) +static sm_ret_T +sockmap_open_instance(sm_sockmap_P db, uint i) { - sm_ret_T ret; + sm_ret_T ret = SM_SUCCESS; + struct sm_sockmap_instance_S *smp = db->sockmap_inst + i; int fd; - SM_REQUIRE(db != NULL); - db->sockmap_fp = NULL; + if (smp->fp) + return SM_SUCCESS; + if (db->sockmap_path != NULL) - { ret = unix_client_connect(db->sockmap_path, &fd); - } else - { ret = net_client_connectipv4(db->sockmap_ipv4, - db->sockmap_port, &fd); - } + db->sockmap_port, &fd); if (sm_is_err(ret)) goto fail; ret = sm_io_open(SmStStdiofd, (void *) &fd, SM_IO_RDWR, - &db->sockmap_fp, SM_IO_WHAT_END); - if (sm_is_err(ret)) - goto fail; - ret = sm_io_setinfo(db->sockmap_fp, SM_IO_DOUBLE, NULL); + &smp->fp, SM_IO_WHAT_END); if (sm_is_err(ret)) goto fail; - ret = sm_io_setinfo(db->sockmap_fp, SM_IO_WHAT_TIMEOUT, - (void *)&db->sockmap_tmout); + ret = sm_io_setinfo(smp->fp, SM_IO_DOUBLE, NULL); if (sm_is_err(ret)) goto fail; + ret = sm_io_setinfo(smp->fp, SM_IO_WHAT_TIMEOUT, + (void *)&db->sockmap_tmout); + if (sm_is_err(ret)) { + fail: + sockmap_close_instance(db, i); + } return ret; +} + +static sm_ret_T +sockmap_find_free_instance0(sm_sockmap_P db, uint *rind) +{ + int i; + int busy_ind = -1; + int free_ind = -1; + + for (i = 0; i < db->sockmap_max; i++) { + if (db->sockmap_inst[i].fp == NULL) { + if (free_ind == -1) + free_ind = i; + } else if (!db->sockmap_inst[i].busy) { + db->sockmap_inst[i].busy = 1; + *rind = i; + return SM_SUCCESS; + } else if (busy_ind != -1) + busy_ind = i; + } + if (free_ind != -1) { + sm_ret_T ret = sockmap_open_instance(db, free_ind); + if (!sm_is_error(ret)) { + db->sockmap_inst[free_ind].busy = 1; + *rind = free_ind; + } + return ret; + } + if (busy_ind != -1) { + /* Degrading to serialized access */ + *rind = busy_ind; + return SM_SUCCESS; + } + /* Giving up... */ + return sm_error_perm(SM_EM_MAP, EAGAIN); +} - fail: - /* cleanup? */ - sockmap_close(db); +static sm_ret_T +sockmap_find_free_instance(sm_sockmap_P db, uint *rind) +{ + sm_ret_T ret; + int r; + + SOCKMAP_LOCK(db); + ret = sockmap_find_free_instance0(db, rind); + SOCKMAP_UNLOCK(db); return ret; } -/* -** SOCKMAP_LOOKUP -- lookup a key in SOCKMAP, return data if found -** -** Parameters: -** map -- map context -** key -- key -** data -- data (output) -** -** Returns: -** usual sm_error code -*/ +static sm_ret_T +sockmap_release_instance(sm_sockmap_P db, uint i) +{ + db->sockmap_inst[i].busy = 0; + return SM_SUCCESS; +} -sm_ret_T -sockmap_lookup(sm_sockmap_P map, sm_str_P key, sm_str_P data) +/* FIXME: Return code? */ +static void +sockmap_close_all_instances(sm_sockmap_P db, int destr) +{ + uint i; + + if (!db->sockmap_inst) + return; + for (i = 0; i < db->sockmap_max; i++) { + sockmap_close_instance(db, i); + if (destr) + SOCKMAP_INST_LOCK_DESTROY(db, i); + } +} + +static sm_ret_T +sockmap_instance_lookup(sm_sockmap_P map, uint i, sm_str_P key, sm_str_P data) { sm_ret_T ret; uint len, replylen; @@ -188,18 +198,11 @@ sockmap_lookup(sm_sockmap_P map, sm_str_P key, sm_str_P data) char *value, *status; sm_file_T *fp; char statbuf[16]; - - SM_REQUIRE(map != NULL); - SM_REQUIRE(key != NULL); - SM_REQUIRE(data != NULL); - - fp = map->sockmap_fp; + struct sm_sockmap_instance_S *smp = map->sockmap_inst + i; + + fp = smp->fp; if (fp == NULL) - { - ret = sockmap_open(map); - if (sm_is_err(ret)) - return ret; - } + return sm_error_temp(SM_EM_MAP, EINVAL); len = strlen(map->sockmap_name) + 1 + sm_str_getlen(key); SM_ASSERT(len > strlen(map->sockmap_name)); SM_ASSERT(len > sm_str_getlen(key)); @@ -282,7 +285,183 @@ sockmap_lookup(sm_sockmap_P map, sm_str_P key, sm_str_P data) return ret; errcl: - sockmap_close(map); + sockmap_close_instance(map, i); + error: return ret; } + + +/* +** SOCKMAP_FREE -- free socket map context +** +** Parameters: +** db -- pointer to socket map +** +** Returns: +** usual sm_error code +*/ + +sm_ret_T +sockmap_free(sm_sockmap_P db) +{ + if (db != NULL) { + if (db->sockmap_inst) + sm_free(db->sockmap_inst); + sm_free_size(db, sizeof(*db)); + } + return SM_SUCCESS; +} + +/* +** SOCKMAP_NEW -- allocate socket map context +** +** Parameters: +** pdb -- pointer to pointer to socket map +** +** Returns: +** usual sm_error code +*/ + +sm_ret_T +sockmap_new(sm_sockmap_P *pdb) +{ + sm_sockmap_P db; + int rc; + + SM_REQUIRE(pdb != NULL); + *pdb = NULL; + db = sm_zalloc(sizeof(*db)); + if (db == NULL) + return sm_error_perm(SM_EM_MAP, ENOMEM); + rc = SOCKMAP_LOCK_INIT(db); + if (rc) { + sm_free(db); + return sm_error_perm(SM_EM_MAP, rc); + } + + /* default for socket map timeout */ + db->sockmap_tmout = 5; + db->sockmap_min = db->sockmap_max = 1; + *pdb = db; + return SM_SUCCESS; +} + +/* +** SOCKMAP_DESTROY -- destroy socket map +** +** Parameters: +** pdb -- pointer to pointer to socket map +** +** Returns: +** usual sm_error code +*/ + +sm_ret_T +sockmap_destroy(sm_sockmap_P *pdb) +{ + sm_ret_T ret; + + SM_REQUIRE(pdb != NULL); + ret = SM_SUCCESS; + if (*pdb != NULL) { + sockmap_close_all_instances(*pdb, 1); + SOCKMAP_LOCK_DESTROY(*pdb); + sockmap_free(*pdb); + *pdb = NULL; + } + return ret; +} + +/* +** SOCKMAP_CLOSE -- close socket map +** +** Parameters: +** db -- pointer to socket map +** +** Returns: +** usual sm_error code +*/ + +sm_ret_T +sockmap_close(sm_sockmap_P db) +{ + sm_ret_T ret; + + ret = SM_SUCCESS; + sockmap_close_all_instances(db, 0); + return ret; +} + +/* +** SOCKMAP_OPEN -- open socket map +** +** Parameters: +** pdb -- pointer to pointer to socket map +** +** Returns: +** usual sm_error code +*/ + +sm_ret_T +sockmap_open(sm_sockmap_P db) +{ + sm_ret_T ret; + uint i, j; + + SM_REQUIRE(db != NULL); + if (!db->sockmap_inst) { + ret = sockmap_init_all_instances(db); + if (sm_is_error(ret)) + return ret; + } + + for (i = 0, j = 0; i < db->sockmap_max && j < db->sockmap_min; i++) { + if (db->sockmap_inst[i].fp == NULL) { + ret = sockmap_open_instance(db, i); + if (sm_is_error(ret)) + break; + } + j++; + } + + if (j > 0 && ret) + /* Try to continue anyway */ + ret = SM_SUCCESS; + + if (sm_is_error(ret)) { + /* cleanup? */ + sockmap_close(db); + } + + return ret; +} + +/* +** SOCKMAP_LOOKUP -- lookup a key in SOCKMAP, return data if found +** +** Parameters: +** map -- map context +** key -- key +** data -- data (output) +** +** Returns: +** usual sm_error code +*/ + +sm_ret_T +sockmap_lookup(sm_sockmap_P map, sm_str_P key, sm_str_P data) +{ + sm_ret_T ret; + uint ninst; + + ret = sockmap_find_free_instance(map, &ninst); + if (sm_is_error(ret)) + return ret; + SOCKMAP_INST_LOCK(map, ninst); + ret = sockmap_instance_lookup(map, ninst, key, data); + sockmap_release_instance(map, ninst); + SOCKMAP_INST_UNLOCK(map, ninst); + return ret; +} + diff --git a/libsmmap/t-sockmap-1.c b/libsmmap/t-sockmap-1.c new file mode 100644 index 0000000..ff17de2 --- /dev/null +++ b/libsmmap/t-sockmap-1.c @@ -0,0 +1,264 @@ +/* + * Copyright (c) 2004-2006 Sendmail, Inc. and its suppliers. + * All rights reserved. + * + * By using this file, you agree to the terms and conditions set + * forth in the LICENSE file which can be found at the top level of + * the sendmail distribution. + * + */ + +#include "sm/generic.h" +SM_RCSID("@(#)$Id: t-sockmap-0.c,v 1.10 2008/02/10 06:17:29 ca Exp $") + +#include "sm/error.h" +#include "sm/heap.h" +#include "sm/memops.h" +#include "sm/sysexits.h" +#include "sm/test.h" +#include "sm/maps.h" +#include "sm/mapc.h" +#include "sm/map.h" +#include "sm/mapclasses.h" +#include "sm/net.h" +#include +#include "sm/io.h" + +int Verbose = 0; + +#define MAPC_TYPE "socket" +#define MAPC_NAME "name" + +sm_map_P map; +size_t test_run_count; + +static pthread_cond_t signal_cond = PTHREAD_COND_INITIALIZER; +static pthread_mutex_t signal_mutex = PTHREAD_MUTEX_INITIALIZER; + +struct test_tab { + const char *key; + int (*is_ok)(sm_ret_T, char **); + pthread_t thr; +}; + +int +test_success(sm_ret_T ret, char **pret) +{ + return sm_is_success(ret); +} + +int +test_notfound(sm_ret_T ret, char **pret) +{ + if (!sm_is_err(ret)) + *pret = "unexpected successful return"; + if (SM_MAP_NOTFOUND != ret) { + *pret = smerr2txt(ret); + return 0; + } + return 1; +} + +int +test_err(sm_ret_T ret, char **pret) +{ + if (!sm_is_err(ret)) { + *pret = "unexpected successful return"; + return 0; + } + return 1; +} + +struct test_tab test_tab[] = { + { "bastiaan.bakker@example.com", test_success }, + { "wolter.eldering@example.com", test_success }, + { "no@example.com", test_notfound }, + { "TIMEOUT", test_err }, + { "wolter.eldering@example.com", test_success }, + { "bastiaan.bakker@example.com", test_success }, + { NULL } +}; + +#define incr_test_run_count() test_run_count++ + +void +decr_test_run_count() +{ + if (--test_run_count == 0) { + pthread_mutex_lock(&signal_mutex); + pthread_cond_signal(&signal_cond); + pthread_mutex_unlock(&signal_mutex); + } +} + +void * +test_thr(void *data) +{ + const char *arg = (const char*) data; + sm_str_P lhs, rhs; + sm_ret_T ret; + lhs = rhs = NULL; + + incr_test_run_count(); + if (Verbose) + fprintf(stderr, "%s: BEGIN\n", arg); + lhs = sm_str_new(NULL, 256, 1024); + SM_ASSERT(lhs != NULL); + + rhs = sm_str_new(NULL, 256, 1024); + SM_ASSERT(rhs != NULL); + + sm_str_clr(rhs); + sm_str_clr(lhs); + sm_str_scat(lhs, arg); + ret = sm_map_lookup(map, SMMAP_FL_NONE, lhs, rhs); + if (Verbose) + fprintf(stderr, "%s: FINISHED: %x = %s\n", + arg, ret, ret == 0 ? "OK" : smerr2txt(ret)); + error: + SM_STR_FREE(lhs); + SM_STR_FREE(rhs); + decr_test_run_count(); + return (void*) ret; +} + + +static void +testh(const char *name, const char *path, ipv4_T ipv4, short port) +{ + sm_ret_T ret; + sm_maps_P maps; + sm_cstr_P mtype, mname; + int i; + + maps = NULL; + mtype = mname = NULL; + + ret = sm_maps_init(&maps); + SM_TEST(maps != NULL); + if (maps == NULL) + return; + SM_TEST(sm_is_success(ret)); + + mtype = sm_cstr_scpyn0((const uchar *)MAPC_TYPE, strlen(MAPC_TYPE)); + SM_TEST_E(mtype != NULL); + + mname = sm_cstr_scpyn0((const uchar *)MAPC_NAME, strlen(MAPC_NAME)); + SM_TEST_E(mname != NULL); + + ret = sm_sockmap_class_create(maps); + SM_TEST(sm_is_success(ret)); + + map = NULL; + ret = sm_map_open(maps, mname, mtype, 0, name, SMAP_MODE_RDWR, &map, + SMPO_SOCKPATH, path, + SMPO_PORT, port, SMPO_IPV4, ipv4, + SMPO_MIN_OCONN, 1, SMPO_MAX_OCONN, 10, +// SMPO_TMOUT, 3600, + SMPO_END); + SM_TEST_E(sm_is_success(ret)); + + for (i = 0; test_tab[i].key; i++) + pthread_create(&test_tab[i].thr, NULL, test_thr, + (void*)test_tab[i].key); + + pthread_mutex_lock(&signal_mutex); + pthread_cond_wait(&signal_cond, &signal_mutex); + pthread_mutex_unlock(&signal_mutex); + + for (i = 0; test_tab[i].key; i++) { + void *val; + sm_ret_T ret; + char *text = NULL; + pthread_join(test_tab[i].thr, &val); + ret = val; + if (test_tab[i].is_ok(ret, &text) == 0) { + fprintf(stderr, "%d: %s: FAIL", i, test_tab[i].key); + if (text) + fprintf(stderr, " %s", text); + fprintf(stderr, "\n"); + } else + fprintf(stderr, "%d: %s: OK\n", i, test_tab[i].key); + } + + ret = sm_map_close(map, 0); + SM_TEST(sm_is_success(ret)); + + ret = sm_maps_term(maps); + SM_TEST(sm_is_success(ret)); + SM_CSTR_FREE(mtype); + SM_CSTR_FREE(mname); + return; + + error: + sm_maps_term(maps); +} + +#define T_SM_NAME "virtuser" +#define T_SM_PATH NULL +#define T_SM_PORT 1289 +#define T_SM_IP 0x7F000001 + +static sm_ret_T +usage(const char *prg) +{ + sm_io_fprintf(smioerr, "usage: %s [options]\n" + "-a ip IPv4 address [%#x]\n" + "-N name name of map [%s]\n" + "-P path path [%s]\n" + "-p port port [%d]\n" + "-v\n" + , prg + , T_SM_IP + , T_SM_NAME + , T_SM_PATH + , T_SM_PORT + ); + return EX_USAGE; +} + +int +main(int argc, char *argv[]) +{ + char *path, *name, *prg; + ipv4_T ipv4; + short port; + int c; + + prg = argv[0]; + path = NULL; + name = "virtuser"; + port = 1289; + ipv4 = ntohl(0x7F000001); + while ((c = getopt(argc, argv, "a:N:P:p:H:s:V")) != -1) + { + switch (c) + { + case 'a': + ipv4 = (ipv4_T) atol(optarg); + break; + case 'N': + name = strdup(optarg); + if (name == NULL) + return 1; + break; + case 'P': + path = strdup(optarg); + if (path == NULL) + return 1; + break; + case 'p': + port = atoi(optarg); + break; + case 'V': + Verbose++; + break; + default: + usage(prg); + return EX_USAGE; + } + } + sm_test_begin(argc, argv, "test socket map 0"); + testh(name, path, ipv4, port); + return sm_test_end(); +} -- 1.6.0