Provided by: postfix_3.10.2-1ubuntu1_amd64 bug

NAME
       socketmap_table - Postfix socketmap table lookup client


SYNOPSIS
       postmap -q "string" socketmap:inet:host:port:name
       postmap -q "string" socketmap:unix:pathname:name

       postmap -q - socketmap:inet:host:port:name <inputfile
       postmap -q - socketmap:unix:pathname:name <inputfile


DESCRIPTION
       The Postfix mail system uses optional tables for address rewriting, mail routing or policy lookup.

       The  Postfix  socketmap client expects TCP endpoint names of the form inet:host:port:name, or UNIX-domain
       endpoints of the form unix:pathname:name.  In both cases, name specifies the name field  in  a  socketmap
       client request (see "REQUEST FORMAT" below).


PROTOCOL
       Socketmaps  use  a  simple  protocol: the client sends one request, and the server sends one reply.  Each
       request and each reply are sent as one netstring object.


REQUEST FORMAT
       The socketmap protocol supports only the lookup request.  The request has the following form:

       name <space> key
              Search the named socketmap for the specified key.

       Postfix will not generate partial search keys such as  domain  names  without  one  or  more  subdomains,
       network addresses without one or more least-significant octets, or email addresses without the localpart,
       address extension or domain portion. This behavior is also found with cidr:, pcre:, and regexp: tables.


REPLY FORMAT
       Replies must have the following form:

       OK <space> data
              The requested data was found.

       NOTFOUND <space>
              The requested data was not found.

       TEMP <space> reason

       TIMEOUT <space> reason

       PERM <space> reason
              The request failed. The reason, if non-empty, is descriptive text.


PROTOCOL LIMITS
       The  Postfix  socketmap  client  requires that replies are no longer than 100000 bytes (not including the
       netstring encapsulation). This limit can  be  changed  with  the  socketmap_max_reply_size  configuration
       parameter (Postfix 3.10 and later).

       The  Postfix  socketmap  client  enforces  a  100s time limit to connect to a socketmap server, to send a
       request, and to receive a reply. It closes an idle connection after 10s, and closes an active  connection
       after 100s. These limits are not (yet) configurable.


SECURITY
       This map cannot be used for security-sensitive information, because neither the connection nor the server
       are authenticated.


CONFIGURATION PARAMETERS
       socketmap_max_reply_size (100000)
              The maximum allowed reply size from a socketmap server, not including the netstring encapsulation.


SEE ALSO
       https://cr.yp.to/proto/netstrings.txt, netstring definition
       postconf(1), Postfix supported lookup tables
       postmap(1), Postfix lookup table manager
       regexp_table(5), format of regular expression tables
       pcre_table(5), format of PCRE tables
       cidr_table(5), format of CIDR tables


README FILES
       Use "postconf readme_directory" or "postconf html_directory" to locate this information.
       DATABASE_README, Postfix lookup table overview


BUGS
       The protocol time limits are not yet configurable.


LICENSE
       The Secure Mailer license must be distributed with this software.


HISTORY
       Socketmap support was introduced with Postfix version 2.10.

       The socketmap protocol was published with Sendmail v8.13.


AUTHOR(S)
       Wietse Venema
       IBM T.J. Watson Research
       P.O. Box 704
       Yorktown Heights, NY 10598, USA

       Wietse Venema
       Google, Inc.
       111 8th Avenue
       New York, NY 10011, USA

       Wietse Venema
       porcupine.org

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