What process is listening on a certain port on Solaris?

Asked 2008-09-18T09:22:37.703

So I log into a Solaris box, try to start Apache, and find that there is already a process listening on port 80, and it's not Apache. Our boxes don't have lsof installed, so I can't query with that. I guess I could do:

pfiles `ls /proc` | less

and look for "port: 80", but if anyone has a better solution, I'm all ears! Even better if I can look for the listening process without being root. I'm open to both shell and C solutions; I wouldn't mind having a little custom executable to carry with me for the next time this comes up.

Updated: I'm talking about generic installs of solaris for which I am not the administrator (although I do have superuser access), so installing things from the freeware disk isn't an option. Obviously neither are using Linux-specific extensions to fuser, netstat, or other tools. So far running pfiles on all processes seems to be the best solution, unfortunately. If that remains the case, I'll probably post an answer with some slightly more efficient code that the clip above.

unix solaris

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2 Answers

Mavroprovato's answer reports more than only the listening ports. Listening ports are sockets without a peer. The following Perl program reports only the listening ports. It works for me on SunOS 5.10.

#! /usr/bin/env perl
##
## Search the processes which are listening on the given port.
##
## For SunOS 5.10.
##

use strict;
use warnings;

die "Port missing" unless $#ARGV >= 0;
my $port = int($ARGV[0]);
die "Invalid port" unless $port > 0;

my @pids;
map { push @pids, $_ if $_ > 0; } map { int($_) } `ls /proc`;

foreach my $pid (@pids) {
    open (PF, "pfiles $pid 2>/dev/null |") 
        || warn "Can not read pfiles $pid";
    $_ = <PF>;
    my $fd;
    my $type;
    my $sockname;
    my $peername;
    my $report = sub {
        if (defined $fd) {
            if (defined $sockname && ! defined $peername) {
                print "$pid $type $sockname\n"; } } };
    while (<PF>) {
        if (/^\s*(\d+):.*$/) {
            &$report();
            $fd = int ($1);
            undef $type;
            undef $sockname;
            undef $peername; }
        elsif (/(SOCK_DGRAM|SOCK_STREAM)/) { $type = $1; }
        elsif (/sockname: AF_INET[6]? (.*)  port: $port/) {
            $sockname = $1; }
        elsif (/peername: AF_INET/) { $peername = 1; } }
    &$report();
    close (PF); }

answered 2012-03-14T14:24:34.513

You might not want to, but your best bet is to grab the sunfreeware CD and install lsof.

Other than that, yes you can grovel around in /proc with a shell script.

answered 2008-09-22T23:26:42.450

What process is listening on a certain port on Solaris?

2 Answers

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