All,
I've been having a
problem with snmptrapd crashing after successfully logging and forwarding v3
traps. I have no problems with version 2 or 1. If I turn forwarding off,
snmptrapd does not crash with v3 traps. My initial tests were run on net-snmp
version 5.3.0.1. I found online a mention of the fact that there were SNMP v3
problems in 5.3.0.1 so I tried using net-snmp version 5.4.2.1 and still
encountered the same problem. Then I put a return at the beginning of
usm_free_usmStateReference, recompiled everything and I no longer see a
segfault.
Below is an excerpt
from the command I issued, the backtrace and my snmptrapd.conf file. I could
not find this issue resolved in the bugtracker although I did find a similar
issue that is still open:
http://sourceforge.net/tracker/index.php?func=detail&aid=1644670&group_id=12694&atid=112694
Any help would be
greatly appreciated.
Thanks,
Felix
snmptrap -d -e
0x0102030405 -v 3 -M /usr/share/snmp/mibs -m ALL -l noauthnoPriv -u traptest
192.168.0.141 "" .1.3.6.1.3.94.0.4 connUnitEventId i 1
Core was generated by `/usr/sbin/snmptrapd -f -M
/usr/share/snmp/mibs -m ALL -c /etc/snmptrapd.conf -L'.
Program terminated
with signal 11, Segmentation fault.
#0 0x47bf3f17 in free () from
/lib/libc.so.6
(gdb) bt
#0 0x47bf3f17 in free () from
/lib/libc.so.6
#1 0x47f3a127 in usm_free_usmStateReference () from
/usr/lib/libnetsnmp.so.10
#2 0x00000007 in ?? ()
#3 0x081b8650 in ??
()
#4 0x47cc809b in snmp_input () from /usr/lib/libnetsnmptrapd.so.10
#5
0x47f17b09 in ?? () from /usr/lib/libnetsnmp.so.10
#6 0x0816c470 in ??
()
#7 0x081b8650 in ?? ()
#8 0x542abe62 in ?? ()
#9 0x08178f38 in ??
()
#10 0x081b6280 in ?? ()
#11 0xff8b6518 in ?? ()
#12 0x08178f38 in ??
()
#13 0xff8b6528 in ?? ()
#14 0x47bf5a69 in malloc () from
/lib/libc.so.6
###########################################################################
#
#
snmptrapd.conf
#
# - created by the snmpconf configuration
program
#
###########################################################################
#
SECTION: Output formatting for traps received.
#
# Output from snmptrapd
is formatted according to the
# rules defined by the formatting
configuration directives.
# format1: How SNMPv1 traps are
formatted.
# See the snmptrapd.conf manual page for format string
details.
# arguments: formatstring
# format2: How SNMPv2 and SNMPv3 traps are
formatted.
# See the snmptrapd.conf manual page for format string
details.
# arguments: formatstring
authCommunity log,execute,net
public
disableAuthorization yes
#createUser informtest MD5 mypassword DES
mypassword
#authUser log,net informtest
createUser -e 0x0102030405 traptest MD5 mypassword
DES myotherpassword
authUser log,execute,net traptest
format1 %V\n% Agent Address: %A \n PDU Source
Hostname: %B \n Date: %#02.2h:%#
02.2j:%#02.2k %#02.2m/%#02.2l/%#y \n
Enterprise OID: %N \n Trap Type: %W \n Tr
ap Sub-Type: %q \n
Community/Infosec Context: %P \n Uptime: %#T \n Description
: %W \n PDU
Attribute/Value Pair Array:\n%v \n -------------- \n
format2 %V\n% PDU Source Hostname: %B \n Date:
%#02.2h:%#02.2j:%#02.2k %#02.2m
/%#02.2l/%#y \n Community/Infosec Context: %P
\n PDU Attribute/Value Pair Arra
y:\n%v \n -------------- \n
snmpTrapdAddr 192.168.0.141:162
forward
default a.b.c.d (I've commented out the actual
address I'm forwarding to)
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