Skip site navigation (1)Skip section navigation (2)

FreeBSD Manual Pages

  
 
  

home | help
TCP_TABLE(5)		      File Formats Manual		  TCP_TABLE(5)

NAME
       tcp_table - Postfix client/server table lookup protocol

SYNOPSIS
       postmap -q "string" tcp:host:port

       postmap -q - tcp:host:port <inputfile

DESCRIPTION
       The  Postfix  mail system uses optional tables for address rewriting or
       mail routing. These tables are usually in dbm or	 db  format.  Alterna-
       tively, table lookups can be directed to	a TCP server.

       To  find	 out  what types of lookup tables your Postfix system supports
       use the "postconf -m" command.

       To test lookup tables, use the "postmap -q" command as described	in the
       SYNOPSIS	above.

PROTOCOL DESCRIPTION
       The TCP map class implements a very simple protocol: the	client sends a
       request,	and the	server sends one reply.	Requests and replies are  sent
       as  one	line of	ASCII text, terminated by the ASCII newline character.
       Request and reply parameters (see below)	are separated by whitespace.

       Send and	receive	operations must	complete in 100	seconds.

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

       get SPACE key NEWLINE
	      Look up data under 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, ad-
       dress extension or domain portion. This behavior	 is  also  found  with
       cidr:, pcre:, and regexp: tables.

REPLY FORMAT
       Each  reply specifies a status code and text. Replies must be no	longer
       than 4096 characters including the newline terminator.

       500 SPACE text NEWLINE
	      In case of a lookup request, the requested data does not	exist.
	      The text describes the nature of the problem.

       400 SPACE text NEWLINE
	      This indicates an	error condition. The text describes the	nature
	      of the problem. The client should	retry the request later.

       200 SPACE text NEWLINE
	      The request was successful. In the case of a lookup request, the
	      text contains an encoded version of the requested	data.

ENCODING
       In  request  and	 reply	parameters, the	character %, each non-printing
       character, and each whitespace character	must be	replaced by %XX, where
       XX is the corresponding ASCII hexadecimal character value. The hexadec-
       imal codes can be specified in any case (upper, lower, mixed).

       The Postfix client always encodes a request.  The server	may  omit  the
       encoding	 as  long  as  the reply is guaranteed to not contain the % or
       NEWLINE character.

SECURITY
       Do not use TCP lookup  tables  for  security  critical  purposes.   The
       client-server connection	is not protected and the server	is not authen-
       ticated.

BUGS
       Only the	lookup method is currently implemented.

       The client does not hang	up when	the connection	is  idle  for  a  long
       time.

SEE ALSO
       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

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

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

								  TCP_TABLE(5)

NAME | SYNOPSIS | DESCRIPTION | PROTOCOL DESCRIPTION | REQUEST FORMAT | REPLY FORMAT | ENCODING | SECURITY | BUGS | SEE ALSO | README FILES | LICENSE | AUTHOR(S)

Want to link to this manual page? Use this URL:
<https://www.freebsd.org/cgi/man.cgi?query=tcp_table&sektion=5&manpath=FreeBSD+13.0-RELEASE+and+Ports>

home | help