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+.TH s/qmail: tcp-environ 5
+.SH NAME
+tcp-environ \- TCP-related environment variables
+.SH DESCRIPTION
+The following environment variables
+describe a TCP connection.
+They are set up by
+.B tcpclient 
+and
+.B tcpserver 
+as well as
+.BR sslclient 
+and 
+.BR sslserver .
+
+Note that
+.BR TCPLOCALHOST ,
+.BR TCP6LOCALHOST ,
+.BR TCPREMOTEHOST ,
+.BR TCP6REMOTEHOST ,
+and
+.BR TCPREMOTEINFO ,
+.BR TCP6REMOTEINFO ,
+can contain arbitrary characters.
+.TP 5
+PROTO
+The string
+.BR TCP ,
+or
+.BR TCP6 .
+.TP 5
+TCPLOCALHOST/TCP6LOCALHOST 
+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,
+.BR TCPLOCALHOST ,
+.B TCP6LOCALHOST
+is not set.
+.TP 5
+TCPLOCALIP
+The IPv4 address of the local host, in dotted-decimal form.
+.TP 5
+TCP6LOCALIP
+The compactified IPv6 address of the local host.
+.TP 5
+TCPLOCALPORT/TCP6LOCALPORT
+The local TCP port number, in decimal.
+.TP 5
+TCPREMOTEHOST/TCP6RMOTEHOST
+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,
+.B TCPREMOTEHOST
+or 
+.B TCP6REMOTEHOST 
+is not set.
+.TP 5
+TCPREMOTEINFO/TCP6REMOTEINFO
+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,
+.BR TCPREMOTEINFO ,
+.B TCP6REMOTEINFO
+is not set.
+.TP 5
+TCPREMOTEIP
+The IPv4 address of the remote host.
+.TP 5
+TCP6REMOTEIP
+The IPv6 address of the remote host.
+.TP 5
+TCPREMOTEPORT/TCP6REMOTEPORT
+The remote TCP port number.
+.TP 5
+TCP6INTERFACE
+contains the interface name for IPv6 connections.
+
+.SH "SEE ALSO"
+tcpclient(1),
+tcpserver(1),
+sslclient(1),
+sslserver(1),
+tcp(4)