#!/bin/sh
#
# tcp: Plugin to monitor IPV4/6 TCP socket status on a Linux host.
#
# License: GPLv2
#
# Copyright 2009 Tim Small - tim@seoss.co.uk
#
# Parameters supported:
#
#    config
#    autoconf
#
#
# Magic markers?
#%# family=auto
#%# capabilities=autoconf suggest

case $1 in
    config)
        cat <<EOF
graph_title TCP
graph_vlabel TCP Sockets
graph_category network
graph_args -l 0
graph_info TCP socket states for the local machine
EOF
	for i in established syn_sent syn_recv fin_wait1 fin_wait2 time_wait close close_wait last_ack listen closing
	do
		echo ${i}.label $i
		echo ${i}.draw LINE2
		echo ${i}.info Sockets in state $i
	done

        exit 0
	;;
    autoconf)
        if [ -f /proc/net/tcp -o -f /proc/net/tcp6 ] ; then
	    echo yes
	    exit 0
	else
	    echo no
	    exit 1
	fi
esac

# See #include <netinet/tcp.h>

cat /proc/net/tcp* | awk '
  BEGIN  { STATE["01"]=STATE["02"]=STATE["03"]=STATE["04"]=STATE["05"]=STATE["06"]=STATE["07"]=STATE["08"]=STATE["09"]=STATE["0A"]=STATE["0B"]=0; }
  match ($4, /0[0-9A-B]/) { STATE[$4]++; }
  END    { print "established.value " STATE["01"];
           print "syn_sent.value "    STATE["02"];
	   print "syn_recv.value "    STATE["03"];
	   print "fin_wait1.value "   STATE["04"];
	   print "fin_wait2.value "   STATE["05"];
	   print "time_wait.value "   STATE["06"];
	   print "close.value "       STATE["07"];
	   print "close_wait.value "  STATE["08"];
	   print "last_ack.value "    STATE["09"];
	   print "listen.value "      STATE["0A"];
	   print "closing.value "     STATE["0B"];
	 }'