SnertSoft: We Serve Your Server

milter-ns/0.5 (alpha)
«What's in a name?»


Description & Usage ° Installation & Notes ° License & Support

Description

This Sendmail mail filter utility simply looks up the DNS name servers of the sender's domain of the MAIL FROM: and adds a report header to the message containing the information. This header can be subsequently used by other milters or tools such as milter-cli or milter-spamc with SpamAssassin, or an end user's mail client message filters.

Usage

milter-ns [options ...][arguments ...]

Options can be expressed in four different ways. Boolean options are expressed as +option or -option to turn the option on or off respectively. Options that required a value are expressed as option=value or option+=value for appending to a value list. Note that the +option and -option syntax are equivalent to option=1 and option=0 respectively. Option names are case insensitive.

Some options, like +help or -help, are treated as immediate actions or commands. Unknown options are ignored. The first command-line argument is that which does not adhere to the above option syntax. The special command-line argument -- can be used to explicitly signal an end to the list of options.

The default options, as shown below, can be altered by specifying them on the command-line or within an option file, which simply contains command-line options one or more per line and/or on multiple lines. Comments are allowed and are denoted by a line starting with a hash (#) character. If the file option is defined and not empty, then it is parsed first followed by the command-line options.

Note that there may be additional options that are listed in the option summary given by +help or -help that are not described here.

+daemon
Start as a background daemon or foreground application.
file=/etc/mail/milter-ns.cf
Read the option file before command line options. This option is set by default. To disable the use of an option file, simply say file=''
-help or +help
Write the option summary to standard output and exit. The output is suitable for use as an option file.
milter-socket=unix:/var/run/milter/milter-ns.socket
A socket specifier used to communicate between Sendmail and milter-ns. Typically a unix named socket or a host:port. This value must match the value specified for the INPUT_MAIL_FILTER() macro in the sendmail.mc file. The accepted syntax is:
{unix|local}:/path/to/file
A named pipe. (default)
inet:port@{hostname|ip-address}
An IPV4 socket.
inet6:port@{hostname|ip-address}
An IPV6 socket.
milter-timeout=7210
The sendmail/milter I/O timeout in seconds.
pid-file=/var/run/milter/milter-ns.pid
The file path of where to save the process-id.
-quit or +quit
Quit an already running instance of the milter and exit. This is equivalent to: kill -QUIT `cat /var/run/milter/milter-ns.pid`
-restart or +restart
Terminate an already running instance of the milter before starting.
run-group=milter
The process runtime group name to be used when started by root.
run-user=milter
The process runtime user name to be used when started by root.
verbose=info
A comma separated list of how much detail to write to the mail log. Those mark with § have meaning for this milter.
§ all All messages
§ 0 Log nothing.
§ info General info messages. (default)
  trace Trace progress through the milter.
  parse Details from parsing addresses or special strings.
  debug Lots of debug messages.
§ dialog I/O from Communications dialog
  state State transitions of message body scanner.
  dns Trace & debug of DNS operations
  cache Cache get/put/gc operations.
  database Sendmail database lookups.
  socket-fd Socket open & close calls
  socket-all All socket operations & I/O
§ libmilter libmilter engine diagnostics
work-dir=/var/tmp
The working directory of the process. Normally serves no purpose unless the kernel option that permits daemon process core dumps is set.

SMTP Responses

This is the list of possible SMTP responses.

Installation

  1. Download:

    milter-ns/0.5 md5sum Change Log
    LibSnert md5sum Change Log

  2. If you have never built a milter for Sendmail, then please make sure that you build and install libmilter, which is not built by default when you build Sendmail. Please read the libmilter documentation. Briefly, it should be something like this: 

    cd (path to)/sendmail-8.13.6/libmilter
sh Build -c install

  3. The build process for libsnert and milter-ns is pretty straight forward once you have libmilter installed: 

    cd (path to)/com/snert/src/lib
./configure
make build
cd ../milter-ns
./configure
make build
make install

    Both configuration scripts have some options that allow you to override defaults. Those options are listed with: 

    ./configure --help

  4. An example /usr/local/share/examples/milter-ns/milter-ns.mc is supplied. This file should be reviewed and the necessary elements inserted into your Sendmail .mc file and sendmail.cf rebuilt. Please note the comments on the general milter flags.

  5. Once installed and configured, start milter-ns and then restart Sendmail. An example startup script is provided in /usr/local/share/examples/milter-ns/milter-ns.sh.

Notes

  • Currently tested platforms:

    Cobalt Qube 1 with Linux RH 5.1 (mips 2.0.34 kernel); Linux RH 5.1 (Intel x386 2.2.25 kernel); OpenBSD 3.6 (Intel x386)

  • The minimum desired file ownership and permissions are as follows for a typical Linux system. For FreeBSD, NetBSD, and OpenBSD the binary and cache locations may differ, but have the same permissions.

    Process user ``milter'' is primary member of group ``milter'' and secondary member of group ``smmsp''. Note that the milter should be started as root, so that it can create a .pid file and .socket file in /var/run; after which it will switch process ownership to milter:milter before starting the accept socket thread.

    /etc/mail/root:smmsp0750 drwxr-x---
    /etc/mail/access.dbroot:smmsp0640 -rw-r-----
    /etc/mail/sendmail.cfroot:smmsp0640 -rw-r-----
    /etc/mail/milter-ns.cfroot:root0644 -rw-r--r--
    /var/run/p0f.socket?:?0644 srw-rw-rw-
    /var/run/milter/milter-ns.pidmilter:milter0644 -rw-r--r--
    /var/run/milter/milter-ns.socketmilter:milter0644 srw-r--r--
    /var/db/milter-nsmilter:milter0644 -rw-r--r-- (*BSD)
    /var/cache/milter-nsmilter:milter0644 -rw-r--r-- (linux)
    /usr/local/libexec/milter-nsroot:milter0550 -r-xr-x---

License Agreement 1.8

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Gifts

Gifts from the author's Amazon US or Amazon UK wish list (search by mail address <achowe at snert dot com>) are welcomed for the continued encouragement, moral support, and ego pumping needed to work in foreign non-english speaking lands.

Copyright 2006, 2012 by Anthony Howe. All rights reserved.

drops in a bucket since 7 June 2006