/usr/share/munin/plugins/tcp is in munin-node 1.4.6-3ubuntu3.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 | #!/bin/sh
: <<EOF
=head1 NAME
tcp - Plugin to monitor IPV4/6 TCP socket status on a Linux host.
=head1 AUTHOR
Copyright 2009 Tim Small <tim@seoss.co.uk>
=head1 LICENSE
GPLv2
=begin comment
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 dated June, 1991.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
USA.
=end comment
=head1 MAGIC MARKERS
#%# family=manual
#%# capabilities=autoconf
=cut
EOF
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 '
match ($4, /0[0-9A-B]/) {
STATE[$4]++;
}
END {
printf "established.value %d\n", STATE["01"];
printf "syn_sent.value %d\n", STATE["02"];
printf "syn_recv.value %d\n", STATE["03"];
printf "fin_wait1.value %d\n", STATE["04"];
printf "fin_wait2.value %d\n", STATE["05"];
printf "time_wait.value %d\n", STATE["06"];
printf "close.value %d\n", STATE["07"];
printf "close_wait.value %d\n", STATE["08"];
printf "last_ack.value %d\n", STATE["09"];
printf "listen.value %d\n", STATE["0A"];
printf "closing.value %d\n", STATE["0B"];
}'
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