Bug 728894

Summary:	lsof should probably not translate port numbers if -n is given (or have an option to do so)
Product:	Red Hat Enterprise Linux 6	Reporter:	David Tonhofer <bughunt>
Component:	lsof	Assignee:	Peter Schiffer <pschiffe>
Status:	CLOSED NOTABUG	QA Contact:	BaseOS QE Security Team <qe-baseos-security>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	6.1
Target Milestone:	rc
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
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Fixed In Version:		Doc Type:	Bug Fix
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Last Closed:	2011-08-10 10:19:57 UTC	Type:	---
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Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
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Description David Tonhofer 2011-08-08 10:18:59 UTC

Description of problem:

Run lsof with -n option:

---> lsof -p 3382 -n | grep TCP

java    3382 user1   34u  IPv6 3433877      0t0     TCP *:43510 (LISTEN)
java    3382 user1   37u  IPv6 3433879      0t0     TCP *:server-jmx (LISTEN)

etc...

"server-jmx" is the symbolic name collected from /etc/services.

The '-n' option does not suppress the lookup of the symbolic name in /etc/services. This is annoying when several names map to the same port and the displayed is NOT the one one is grepping for, or /etc/services changes and sometimes symbolic names can be found and sometimes not.

The '-n' option apparently suppresses only DNS lookup:

-n  This option inhibits the conversion of network numbers to host names for network files.  Inhibiting conversion may make lsof run faster.  It is also useful when host name lookup is not working properly.

Version-Release number of selected component (if applicable):

lsof-4.82-1.2.el6.x86_64

Comment 2 Peter Schiffer 2011-08-10 08:04:50 UTC

You can use -P option:

-P This option inhibits the conversion of port  numbers  to  port
names  for  network files.  Inhibiting the conversion may make
lsof run a little faster.  It is also useful  when  port  name
lookup is not working properly.

Does it work for you?

Comment 3 David Tonhofer 2011-08-10 09:36:54 UTC

I'm STUPID! Yes, it works.

Sorry about that, I really did not see that option. I somehow just looked at -n.

Arrh. Clearly NOTABUG.