manu's blog

Who is stealing my port ?

I often had to deal with problems about port already in use. The main question
was why my server cannot bind on port xxx ? On Linux the --program
option of netstat show you the id of the process currently owning a specific socket connection.

Solaris's netstat command does not have this option. Tired to scan the
/proc  with pfiles I've made a small script. I hope it can be useful to somebody else.

#!/bin/sh
if [ $# -ne 1 ]
then
    echo "usage $0 <port number>"
    exit 1
fi

PORT=$1
echo "looking for process consuming port $PORT"

old=`pwd`
cd /proc
for pid in *
do
  /usr/bin/pfiles $pid 2>/dev/null | /usr/bin/nawk -v port_num=$PORT '
            $0 ~ /^[0-9]*:/ {
                             pid=$1
                             program=$2
            }      
            $1 ~ /^[\t ]*sockname/ && $5 == port_num {
                  printf ("program [%d:%s] is bounded on %s:%d\n",pid,program,$3,port_num)
            }'
done
cd $old

Posted at 07:40PM août 08, 2007 by ejannett in Unix  |  Comments[3]