Script for finding the process using a specific port in Solaris

Many times it is required to know which process is running on a specific port. The application which you are installing may be giving an error such as “can not bind the port” or “the port is already in use”. In these cases we can determine which process has blocked the port. There are also audit requirements sometimes, for finding out all the port and associated processes.

To solve this issue, there is a simple script available (credits to oracle). The script does the following :

1. Loops through all the process directories in /proc
2. Runs pfiles command on each directory while grepping for AF_INET and the port specified as an argument to the script.
3. If the error code returned is 0 ( i.e. success) , the process using the port is echoed out.

The complete script is as below :

#!/bin/bash
# Get the process which listens on port
# $1 is the port we are looking for

if [ $# -lt 1 ]
then
echo "Please provide a port number parameter for this script"
echo "e.g. $0 22"
exit
fi

echo "Greping for your port, please be patient (CTRL+C breaks) ... "

for i in `ls /proc`
do
pfiles $i | grep AF_INET | grep $1
if [ $? -eq 0 ]
then
echo Is owned by pid $i
fi
done

To find the processes using the port 22, run the script as :

# ./port.sh 22
Greping for your port, please be patient (CTRL+C breaks) ...
        sockname: AF_INET6 ::ffff:192.168.1.20  port: 22
Is owned by pid 3657
        sockname: AF_INET6 ::ffff:192.168.1.20  port: 22
Is owned by pid 3658
        sockname: AF_INET6 ::  port: 22
Is owned by pid 824

Check for the processes :

# ps -ef | egrep "3657|3658|824"
    root  3657   824   0 07:57:51 ?           0:00 /usr/lib/ssh/sshd
    root   824     1   0 04:09:51 ?           0:00 /usr/lib/ssh/sshd
    root  3658  3657   0 07:57:51 ?           0:01 /usr/lib/ssh/sshd

Script to find all the open ports

The script below can be used to find all the open ports

#!/bin/ksh
# open_ports.ksh script
#
    pfexec pfiles /proc/* 2>/dev/null | nawk -v port=$1 '
    /^[0-9]/ { cmd=$0; type="unknown"; continue }
    $1 == "SOCK_STREAM" { type="tcp" }
    $1 == "SOCK_DGRAM" { type="udp" }
    $2 == "AF_INET" { if((port!="")&&($5!=port)) continue;
                      if(cmd!="") { printf("%sn    %s:%s/%sn",cmd,$3,$5,type); cmd="" }
                      else { printf("    %s:%s/%sn",cmd,$3,$5,type); }}'

Run the script to display all the open ports in the server :

# ./open_ports.ksh
1920:   /usr/sbin/in.routed
    0.0.0.0:520/udp
    :0.0.0.0/0
5830:   /usr/lib/sendmail -bl -q15m
    127.0.0.1:25/tcp
    :127.0.0.1/587
767:    /usr/sbin/rpcbind
    0.0.0.0:111/unknown
    :0.0.0.0/0
    :0.0.0.0/41986
    :0.0.0.0/111
    :0.0.0.0/0
85:     /lib/inet/in.mpathd
    0.0.0.0:0/udp
    :127.0.0.1/5999

Script to find all the open ports

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