Date: 07 Sep 1998 12:13:05 +0200 From: dag-erli@ifi.uio.no (Dag-Erling Coidan =?iso-8859-1?Q?Sm=F8rgrav?= ) To: "Jan B. Koum " <jkb@best.com> Cc: Graeme Brown <graeme.brown@bt-sys.bt.co.uk>, "FreeBSD-Net (FreeBSD.Org) List" <freebsd-net@FreeBSD.ORG> Subject: Re: How to find which application is using a given UDP port Message-ID: <xzppvd8ut72.fsf@hrotti.ifi.uio.no> In-Reply-To: "Jan B. Koum "'s message of "Mon, 7 Sep 1998 02:24:10 -0700 (PDT)" References: <Pine.BSF.4.02A.9809070222480.6323-100000@shell6.ba.best.com>
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"Jan B. Koum " <jkb@best.com> writes: > Look again: > > % netstat -a > Active Internet connections (including servers) > Proto Recv-Q Send-Q Local Address Foreign Address (state) > tcp 0 0 rafraf.1342 shell6.ba.best.c.ssh > ESTABLISHED > tcp 0 0 *.6000 *.* LISTEN > udp 0 0 *.syslog *.* > ^^^ > You can also just "netstat -an | grep udp" :) It won't tell you *which* app holds the port. fstat(1) will tell you which processes have open TCP or UDP sockets, but not which port. The trick is to use 'fstat' and 'netstat -Aan' and compare addresses: des@fixus-ipv6 ~$ fstat | grep udp root xdm 214 1* internet dgram udp f7372d80 daemon portmap 99 3* internet dgram udp f7372f00 root xntpd 95 4* internet dgram udp f7372ea0 root xntpd 95 5* internet dgram udp f7372e40 root xntpd 95 6* internet dgram udp f7372de0 root syslogd 85 4* internet dgram udp f7372f60 des@fixus-ipv6 ~$ netstat -Aan | grep udp f7372d80 udp 0 0 *.177 *.* f7372de0 udp 0 0 127.0.0.1.123 *.* f7372e40 udp 0 0 128.39.11.50.123 *.* f7372ea0 udp 0 0 *.123 *.* f7372f00 udp 0 0 *.111 *.* f7372f60 udp 0 0 *.514 *.* It should be relatively easy to write a Perl script that combines the output of each command and prints something like this: root xdm 214 1* internet dgram udp *.177 daemon portmap 99 3* internet dgram udp *.111 root xntpd 95 4* internet dgram udp *.123 root xntpd 95 5* internet dgram udp 128.39.11.50.123 root xntpd 95 6* internet dgram udp 127.0.0.1.123 root syslogd 85 4* internet dgram udp *.514 DES -- Dag-Erling Smørgrav - dag-erli@ifi.uio.no To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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