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GNU networking utilities

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4.3 TCPMUX

RFC 1078 describes the TCPMUX protocol: "A TCP client connects to a foreign host on TCP port 1. It sends the service name followed by a carriage-return line-feed <CRLF>. The service name is never case sensitive. The server replies with a single character indicating positive (+) or negative (-) acknowledgment, immediately followed by an optional message of explanation, terminated with a <CRLF>. If the reply was positive, the selected protocol begins; otherwise the connection is closed." The program is passed the TCP connection as file descriptors 0 and 1.

If the TCPMUX service name begins with a "+", inetd returns the positive reply for the program. This allows you to invoke programs that use stdin/stdout without putting any special server code in them.

The special service name "help" causes inetd to list TCPMUX services in `inetd.conf'.

 
Here are several example service entries for the various types of
services:

ftp           stream  tcp   nowait root  /usr/libexec/ftpd       ftpd -l
ntalk         dgram   udp   wait   root  /usr/libexec/ntalkd     ntalkd
tcpmux/+date  stream  tcp   nowait guest /bin/date               date
tcpmux/phonebook stream tcp nowait guest /usr/bin/phonebook   phonebook


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