tcp-environ(5)

tcp-environ - TCP-related environment variables

The following environment variables describe a TCP connection. They are set up by tcp-env, tcpclient, and tcpserver. Note that TCPLOCALHOST, TCPREMOTEHOST, and TCPREMOTEINFO can contain arbitrary characters.

PROTO	The string TCP.
TCPLOCALHOST
	The domain name of the local host, with uppercase letters converted to lowercase. If there is no currently available domain name for the local IP address, TCPLOCALHOST is not set.
TCPLOCALIP
	The IP address of the local host, in dotted-decimal form.
TCPLOCALPORT
	The local TCP port number, in decimal.
TCPREMOTEHOST
	The domain name of the remote host, with uppercase letters converted to lowercase. If there is no currently available domain name for the remote IP address, TCPREMOTEHOST is not set.
TCPREMOTEINFO
	A connection-specific string, perhaps a username, supplied by the remote host via 931/1413/IDENT/TAP. If the remote host did not supply connection information, TCPREMOTEINFO is not set.
TCPREMOTEIP
	The IP address of the remote host.
TCPREMOTEPORT
	The remote TCP port number.

tcpclient(1), tcpserver(1), tcp-env(1), tcp(4)

tcpsvd(8), qmail-qmqpd(8), qmail-qmtpd(8), qmail-smtpd(8), tcpclient(1)