tcpdump mailing list archives

Error in print-ospf layout?


From: click <click () spine-group org>
Date: Sat, 28 Feb 2004 00:57:22 +0100

Hi all,
I tried some libnet's samples to sniffing an OSPFV2 HELLO pachet I saw 
something strange in the endianless:

root@White-Dolphin:/home/click/libnet/sample# ./ospf_hello 192.168.0.1 
192.168.0.1 192.168.0.4
libnet 1.1 OSPF Hello packet shaping[raw]
Wrote 68 byte OSPF packet; check the wire.

Sniffing with tcpdump (last CVS version)

root@White-Dolphin:~/tcpdump# tcpdump -v -i any
tcpdump: WARNING: Promiscuous mode not supported on the "any" device
tcpdump: listening on any, link-type LINUX_SLL (Linux cooked), capture size 68 
bytes
00:35:17.518403 IP (tos 0x0, ttl 254, id 101, offset 0, flags [DF], length: 
68) White-Dolphin.spine.org > White-Dolphin.spine.org: OSPFv2, Hello (1), 
length: 48
        Router-ID: 13.0.0.208, Area 0.238.255.192, Authentication Type: none 
(0)
        Options: [none] [|ospf]
[snip]

Has you can see Router-ID and Area are printed in a wrong way.....
the problem is at line 841 of tcpdump/printf-ospf.c for Router-ID field,
and at line 845 for Area field.

I've patched temporarily print-ospf.c using intoa() and htonl() has you can 
see in the .diff file attached with this mail.

With printf-ospf.c patched:

OSPFv2, Hello (1), length: 48
        Router-ID: 208.0.0.13, Area 192.255.238.0, Authentication Type: none 
(0)
        Options: [none] [|ospf]


Regards
Valerio 'click' Genovese
--
http://www.spine-group.org


Attachment: print-ospf_patch.diff
Description:


Current thread: