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tcp_table (5)
  • >> tcp_table (5) ( Linux man: Форматы файлов )
    •  

    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. Alternatively, 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
    



    

Each request specifies a command, a lookup key, and possibly a
lookup result.

    

    get SPACE key NEWLINE
    
Look up data under the specified key.

    put SPACE key SPACE value NEWLINE
    
This request is currently not implemented.

    
 

    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.
In case of an update request, the request was rejected.
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
hexadecimal 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 authenticated.
 

    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


    

    
 
    Index
    

    

    NAME
    

    SYNOPSIS
    

    DESCRIPTION
    

    PROTOCOL DESCRIPTION
    

    REQUEST FORMAT
    

    REPLY FORMAT
    

    ENCODING
    

    SECURITY
    

    BUGS
    

    SEE ALSO
    

    README FILES
    

    LICENSE
    

    AUTHOR(S)
    

    

    

    

    

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