https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=4588
Summary: Decoding of 3 digit MNC value appears to be broken in
dissect_e212_mcc_mnc()
Product: Wireshark
Version: 1.3.x (Experimental)
Platform: All
OS/Version: All
Status: NEW
Severity: Minor
Priority: Low
Component: Wireshark
AssignedTo: wireshark-bugs@xxxxxxxxxxxxx
ReportedBy: markjwallis@xxxxxxxxx
Build Information:
Copyright 1998-2010 Gerald Combs <gerald@xxxxxxxxxxxxx> and contributors.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Compiled with GTK+ 2.10.4, with GLib 2.12.3, with libpcap 0.9.4, with libz
1.2.3, with POSIX capabilities (Linux), with libpcre 6.6, with SMI 0.4.5,
without c-ares, without ADNS, without Lua, without Python, with GnuTLS 1.4.1,
with Gcrypt 1.2.3, with MIT Kerberos, without GeoIP, without PortAudio, without
AirPcap, with new_packet_list.
Running on Linux 2.6.18-92.1.17.el5, with libpcap version 0.9.4, GnuTLS 1.4.1,
Gcrypt 1.2.3.
Built using gcc 4.1.2 20071124 (Red Hat 4.1.2-42).
--
dissect_e212_mcc_mnc() in packet-e212.c was recently much improved to decode
the entire PLMN-id but the decoding order of a 3 digit MNC was also changed.
The modified function no longer decodes a 3 digit MNC encoded using 3GPP TS
25.413 and instead appears to decode 3 digit MNCs using 3GPP TS 24.008
I think a strategy is needed here to accommodate dissectors that wish to have
an MCC/MNC with a 3 digit MNC decoded using the older TS 24.008 differently
from those that want to have the MCC/MNC decoded using newer standards such as
TS 25.413.
wireshark 1.3.4-SVN-32016
dissect_e212_mcc_mnc()
/* MNC, Mobile network code (octet 3 bits 5 to 8, octet 4) */
mnc3 = octet >> 4;
offset++;
octet = tvb_get_guint8(tvb,offset);
mnc1 = octet & 0x0f;
mnc2 = octet >> 4;
wireshark 1.1.2
wireshark_e212_mcc_mnc()
/* MNC, Mobile network code (octet 3 bits 5 to 8, octet 4) */
mnc1 = octet >> 4;
offset++;
octet = tvb_get_guint8(tvb,offset);
mnc2 = octet & 0x0f;
mnc3 = octet >> 4;
--
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