I have a system where I set up Net-SNMP to proxy for Squid (the caching software). Squid is running on the same machine as Net-SNMP. Its agent is integrated into its cache daemon and only understands SNMPv1, so I have Squid's agent listening on 127.0.0.1:3401.
The snmpd.conf file I give to the Net-SNMP agent contains this line:
proxy -v 1 -c public 127.0.0.1:3401 .1.3.6.1.4.1.3495
The problem occurs when I do a bulk get for a couple of objects from Squid. It seems to be any two or more objects. (A single object will work ok, but why do buld get on one object. :-)
Below is a trace from the agent. I'm running the agent on port 32000 instead of 161 only to isolate it from any other SNMP requests (for example HP OV doing discovery). I'm runing the agent on a Linux box running kernel 2.4.26.
$ /usr/sbin/snmpd -c /etc/snmp/snmpd.conf -C -f -d -p -Lo 10.1.0.36:32000 NET-SNMP version 5.2.1
Received 61 bytes from UDP: [10.1.2.10]:36951 0000: 30 3B 02 01 01 04 06 70 75 62 6C 69 63 A5 2E 02 0;.....public... 0016: 04 20 90 02 54 02 01 02 02 01 00 30 20 30 0E 06 . ..T......0 0.. 0032: 0A 2B 06 01 04 01 9B 27 01 01 01 05 00 30 0E 06 .+.....'.....0.. 0048: 0A 2B 06 01 04 01 9B 27 01 01 02 05 00 .+.....'.....
Received SNMP packet(s) from UDP: [10.1.2.10]:36951 GETBULK message, non-rep=2, max_rep=0 -- SNMPv2-SMI::enterprises.3495.1.1.1 -- SNMPv2-SMI::enterprises.3495.1.1.2
Sending 61 bytes to UDP: [127.0.0.1]:3401 0000: 30 3B 02 01 00 04 06 70 75 62 6C 69 63 A1 2E 02 0;.....public... 0016: 04 63 1C A3 89 02 01 00 02 01 00 30 20 30 0E 06 .c.........0 0.. 0032: 0A 2B 06 01 04 01 9B 27 01 01 01 05 00 30 0E 06 .+.....'.....0.. 0048: 0A 2B 06 01 04 01 9B 27 01 01 02 05 00 .+.....'.....
Received 55 bytes from UDP: [127.0.0.1]:3401 0000: 30 82 00 33 02 01 00 04 06 70 75 62 6C 69 63 A2 0..3.....public. 0016: 82 00 24 02 04 63 1C A3 89 02 01 00 02 01 00 30 ..$..c.........0 0032: 82 00 14 30 82 00 10 06 0B 2B 06 01 04 01 9B 27 ...0.....+.....' 0048: 01 01 01 00 02 01 54 ......T
response to proxy request illegal. We're screwed.
Received 61 bytes from UDP: [10.1.2.10]:36951 0000: 30 3B 02 01 01 04 06 70 75 62 6C 69 63 A5 2E 02 0;.....public... 0016: 04 20 90 02 54 02 01 02 02 01 00 30 20 30 0E 06 . ..T......0 0.. 0032: 0A 2B 06 01 04 01 9B 27 01 01 01 05 00 30 0E 06 .+.....'.....0.. 0048: 0A 2B 06 01 04 01 9B 27 01 01 02 05 00 .+.....'.....
Received SNMP packet(s) from UDP: [10.1.2.10]:36951 Segmentation fault
Heres the command I use to reproduce this:
snmpbulkget -c public -v2c -Cn2 -Cr0 myserver:32000 \ SNMPv2-SMI::enterprises.3495.1.1.1 \ SNMPv2-SMI::enterprises.3495.1.1.2
I haven't hand-decoded the traffic above, yet, but thought I'd share what I have so far. Please let me know if this is a known issue.
Thanks.
-John
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