Note: This is a beta release of Red Hat Bugzilla 5.0. The data contained within is a snapshot of the live data so any changes you make will not be reflected in the production Bugzilla. Also email is disabled so feel free to test any aspect of the site that you want. File any problems you find or give feedback here.

Bug 77926

Summary: cannot connect to snmpd (libwrap)
Product: [Retired] Red Hat Linux Reporter: Jan "Yenya" Kasprzak <kas>
Component: net-snmpAssignee: Phil Knirsch <pknirsch>
Status: CLOSED RAWHIDE QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: 8.0CC: rvokal
Target Milestone: ---   
Target Release: ---   
Hardware: All   
OS: Linux   
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2003-02-05 17:13:37 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:

Description Jan "Yenya" Kasprzak 2002-11-15 14:27:43 UTC
Description of Problem:
snmpd does not accept requests with libwrap.

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

How Reproducible:

Steps to Reproduce:
1. Put "ALL:" to /etc/hosts.allow and "ALL: ALL@ALL" to /etc/hosts.deny
2. Start snmpd with the default config
3. Run snmpwalk -v1 -c public system

Actual Results:
Timeout with "Connection from udp: REFUSED" message in

Expected Results:
The contents of the system SNMP subtree (at least the system.sysContact.0
and system.sysLocation.0 variables).

Additional Information:
The problem is that the agent/snmp_agent.c:netsnmp_agent_check_packet()
function passes the "udp:<sourceport>" string to the TCP wrapper's
host_ctl(3) function instead of the plain "". When I change
the format string "udp:%s:%d" at line 71 of libsnmp/snmpUDPDomain.c to
plain "%s", I am able to connect to my SNMP agent. It is not, however,
a clean fix, and the similar one should be applied to all
snmplib/snmp*Domain.c files, or the netsnmp_agent_check_packet() routine
should be changed.

Comment 1 Jan "Yenya" Kasprzak 2002-11-18 09:35:16 UTC
It appears to be fixed in net-snmp-5.0.6, so I think it you may have
to issue the updated packages for 5.0.6.

Comment 2 Phil Knirsch 2003-02-05 17:13:37 UTC
Yep, fixed in latest rawhide builds, just checked.

Read ya, Phil