https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=5583
Summary: osi-options dissector : dissect_option_route wrong
parsing of NET
Product: Wireshark
Version: 1.4.2
Platform: x86
OS/Version: Linux (other)
Status: NEW
Severity: Minor
Priority: Low
Component: Wireshark
AssignedTo: wireshark-bugs@xxxxxxxxxxxxx
ReportedBy: keysandwood@xxxxxxxx
Build Information:
Paste the COMPLETE build information from "Help->About Wireshark", "wireshark
-v", or "tshark -v".
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dissect_option_route parse the first byte of NET as the NET length, resulting
in incorrect parsing for option OSI_OPT_RECORD_OF_ROUTE.
Fix : netl is one byte before the one actually parsed.
change this_hop = offset + 3;
=> this_hop = offset + 2;
and
/* netl = tvb_get_guint8(tvb, this_hop + 1); */
=> netl = tvb_get_guint8(tvb, this_hop );
I think the misunderstanding comes from the fact that the third octet begins
the NET list, but the first octet (Parameter Code 0xCB) is not on the buffer
received by dissect_option_route.
Maybe same problem for OSI_OPT_SOURCE_ROUTING.
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