Description of problem:

  net-snmp-python adds zeros to end of IP address (IPADDR type), which is not valid.
  This bug report is copied from http://sourceforge.net/p/net-snmp/bugs/2436/

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

  net-snmp-python-5.5-49.el6_5.1.x86_64

How reproducible:

  Always

Steps to Reproduce:
1. Create test script like this.
--- snmp_test.py
#!/bin/env python

import netsnmp

# this is only performing the IP function for the purposes of seeing the invalid IP address via tcpdump
oid = netsnmp.Varbind('.1.3.6.1.4.1.9.9.96.1.1.1.1', '5.50', '192.168.0.1', 'IPADDR')
result = netsnmp.snmpset(oid, Version = 2, DestHost = '192.168.0.254', Community = "secret")
print result


2. Run tcpdump for the packet capturing.

  # tcpdump -i any -s0 -w snmp.pcap  port 161

3. Run the script.

  # python snmp_test.py


Actual results:

The captured packet looks like this.
0000   04 06 73 65 63 72 65 74 a3 2a 02 04 09 c9 03 ba  ..secret.*......
0010   02 01 00 02 01 00 30 1c 30 1a 06 0e 2b 06 01 04  ......0.0...+...
0020   01 09 09 60 01 01 01 01 05 32 40 08 c0 a8 00 01  ...`.....2@.....
0030   00 00 00 00                                      ....

Type: 0x40
Length: 0x08
Value: "c0 a8 00 01 00 00 00 00" => 192.168.0.1.0.0.0.0



Expected results:

The packet should be like this.
0000   04 06 73 65 63 72 65 74 a3 2a 02 04 09 c9 03 ba  ..secret.*......
0010   02 01 00 02 01 00 30 1c 30 1a 06 0e 2b 06 01 04  ......0.0...+...
0020   01 09 09 60 01 01 01 01 05 32 40 04 c0 a8 00 01  ...`.....2@.....

Type: 0x40
Length: 0x04
Value: "c0 a8 00 01" => 192.168.0.1


Additional info:

  I verified the reproducer duplicates the bug on my RHEL6 successfully.