Hi, (This is a follow-up to Debian bug #540394 - see http://bugs.debian.org/540394 for details.)
On Fri, Aug 07, 2009 at 07:51:55PM +0200, Simon Richter wrote: > I'm using this fragment to query my WLAN AP: > > <Data "netgear_wg102_traffic"> > Type "if_octets" > Table true > Instance "WG102::ssid.dot11bg" > Values "WG102::wlanInBytesTotal" "WG102::wlanOutBytesTotal" > </Data> > > This is translated into this SNMP packet: > > 30 56 > 02 01 01 > 04 07 70 72 69 76 61 74 65 > a1 48 > 02 04 6c 1b a8 8a > 02 01 00 > 02 01 00 > 30 3a > 30 11 > 06 0d 2b 06 01 04 01 a3 2e 04 03 04 02 01 0a > 05 00 > 30 11 > 06 0d 2b 06 01 04 01 a3 2e 04 03 04 02 01 0b > 05 00 > 30 11 > 06 0e 2b 06 01 04 01 a3 2e 04 03 02 02 01 04 01 > 05 00 > > (indentation added to show BER encoding) > > The third sequence in the SNMP variable-bindings block has an OID field > that is 14 bytes long (as opposed to the others which use 13 bytes), > however the length field of the surrounding structure claims that the oid > field (with header) followed by the NULL value (since this is a GETNEXT) is > 17 bytes long (as the other variable bindings). > > Thus, parsing the last variable binding terminates after the NULL tag field > but before the NULL tag's length field (i.e. between the 5 and the 0 at the > end). > > Doing an snmpgetnext for these values yields a correct packet: > > 30 56 > 02 01 01 > 04 07 70 72 69 76 61 74 65 > a1 48 > 02 04 57 87 4b 10 > 02 01 00 > 02 01 00 > 30 3a > 30 11 > 06 0d 2b 06 01 04 01 a3 2e 04 03 04 02 01 0a > 05 00 > 30 11 > 06 0d 2b 06 01 04 01 a3 2e 04 03 04 02 01 0b > 05 00 > 30 12 > 06 0e 2b 06 01 04 01 a3 2e 04 03 02 02 01 04 01 > 05 00 > > The difference in line 5 can be ignored (this is the request serial > number). Thanks for reporting this and providing detailed information! Unfortunately, I'm not into the 'snmp' plugin at all and I do not have the time to have a closer look at that. With this message, I'm forwarding the bug report to the upstream mailing list, hoping for feedback and patches ;-) Cheers, Sebastian -- Sebastian "tokkee" Harl +++ GnuPG-ID: 0x8501C7FC +++ http://tokkee.org/ Those who would give up Essential Liberty to purchase a little Temporary Safety, deserve neither Liberty nor Safety. -- Benjamin Franklin
signature.asc
Description: Digital signature
