2002-10-31 07:12:42 +00:00
|
|
|
/* packet-isdn.c
|
|
|
|
* Routines for ISDN packet disassembly
|
|
|
|
*
|
2004-07-18 00:24:25 +00:00
|
|
|
* $Id$
|
2002-10-31 07:12:42 +00:00
|
|
|
*
|
2006-05-21 04:49:01 +00:00
|
|
|
* Wireshark - Network traffic analyzer
|
|
|
|
* By Gerald Combs <gerald@wireshark.org>
|
2002-10-31 07:12:42 +00:00
|
|
|
* Copyright 1998 Gerald Combs
|
|
|
|
*
|
|
|
|
* This program is free software; you can redistribute it and/or
|
|
|
|
* modify it under the terms of the GNU General Public License
|
|
|
|
* as published by the Free Software Foundation; either version 2
|
|
|
|
* of the License, or (at your option) any later version.
|
|
|
|
*
|
|
|
|
* This program is distributed in the hope that it will be useful,
|
|
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
|
|
* GNU General Public License for more details.
|
|
|
|
*
|
|
|
|
* You should have received a copy of the GNU General Public License
|
|
|
|
* along with this program; if not, write to the Free Software
|
2012-06-28 22:56:06 +00:00
|
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
2002-10-31 07:12:42 +00:00
|
|
|
*/
|
|
|
|
|
2012-09-20 02:03:38 +00:00
|
|
|
#include "config.h"
|
2002-10-31 07:12:42 +00:00
|
|
|
|
|
|
|
#include <glib.h>
|
|
|
|
#include <epan/packet.h>
|
2011-11-05 20:47:11 +00:00
|
|
|
#include <epan/prefs.h>
|
2002-10-31 07:12:42 +00:00
|
|
|
#include <epan/circuit.h>
|
|
|
|
|
|
|
|
static int proto_isdn = -1;
|
|
|
|
static int hf_isdn_channel = -1;
|
|
|
|
|
|
|
|
static gint ett_isdn = -1;
|
|
|
|
|
2011-11-05 20:47:11 +00:00
|
|
|
/*
|
|
|
|
* Protocol used on the D channel.
|
|
|
|
*/
|
|
|
|
#define DCHANNEL_LAPD 0 /* LAPD */
|
|
|
|
#define DCHANNEL_DPNSS 1 /* DPNSS link layer */
|
|
|
|
|
|
|
|
static enum_val_t dchannel_protocol_options[] = {
|
|
|
|
{ "lapd", "LAPD", DCHANNEL_LAPD },
|
|
|
|
{ "DPNSS", "DPNSS", DCHANNEL_DPNSS },
|
|
|
|
{ NULL, NULL, 0 }
|
|
|
|
};
|
|
|
|
|
|
|
|
static int dchannel_protocol = DCHANNEL_LAPD;
|
|
|
|
|
2002-10-31 07:12:42 +00:00
|
|
|
static dissector_handle_t lapd_handle;
|
2011-11-05 20:47:11 +00:00
|
|
|
static dissector_handle_t dpnss_link_handle;
|
2002-10-31 07:12:42 +00:00
|
|
|
static dissector_handle_t ppp_hdlc_handle;
|
|
|
|
static dissector_handle_t v120_handle;
|
|
|
|
static dissector_handle_t data_handle;
|
|
|
|
|
|
|
|
static const value_string channel_vals[] = {
|
|
|
|
{ 0, "D" },
|
|
|
|
{ 1, "B1" },
|
|
|
|
{ 2, "B2" },
|
|
|
|
{ 3, "B3" },
|
|
|
|
{ 4, "B4" },
|
|
|
|
{ 5, "B5" },
|
|
|
|
{ 6, "B6" },
|
|
|
|
{ 7, "B7" },
|
|
|
|
{ 8, "B8" },
|
|
|
|
{ 9, "B9" },
|
|
|
|
{ 10, "B10" },
|
|
|
|
{ 11, "B11" },
|
|
|
|
{ 12, "B12" },
|
|
|
|
{ 13, "B13" },
|
|
|
|
{ 14, "B14" },
|
|
|
|
{ 15, "B15" },
|
|
|
|
{ 16, "B16" },
|
|
|
|
{ 17, "B17" },
|
|
|
|
{ 18, "B19" },
|
|
|
|
{ 19, "B19" },
|
|
|
|
{ 20, "B20" },
|
|
|
|
{ 21, "B21" },
|
|
|
|
{ 22, "B22" },
|
|
|
|
{ 23, "B23" },
|
|
|
|
{ 24, "B24" },
|
|
|
|
{ 25, "B25" },
|
|
|
|
{ 26, "B26" },
|
|
|
|
{ 27, "B27" },
|
|
|
|
{ 28, "B29" },
|
|
|
|
{ 29, "B29" },
|
|
|
|
{ 30, "B30" },
|
|
|
|
{ 0, NULL }
|
|
|
|
};
|
|
|
|
|
|
|
|
static void
|
|
|
|
dissect_isdn(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
|
|
{
|
|
|
|
proto_tree *isdn_tree;
|
|
|
|
proto_item *ti;
|
2003-12-21 12:07:09 +00:00
|
|
|
static const guint8 v120_sabme[3] = { 0x08, 0x01, 0x7F };
|
|
|
|
static const guint8 ppp[2] = { 0xFF, 0x03 };
|
2002-10-31 07:12:42 +00:00
|
|
|
circuit_t *circuit;
|
|
|
|
|
2009-08-09 06:26:46 +00:00
|
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, "ISDN");
|
2002-10-31 07:12:42 +00:00
|
|
|
|
|
|
|
if (pinfo->pseudo_header->isdn.uton) {
|
2009-08-09 07:14:16 +00:00
|
|
|
col_set_str(pinfo->cinfo, COL_RES_DL_DST, "Network");
|
|
|
|
col_set_str(pinfo->cinfo, COL_RES_DL_SRC, "User");
|
2002-10-31 07:12:42 +00:00
|
|
|
} else {
|
2009-08-09 07:14:16 +00:00
|
|
|
col_set_str(pinfo->cinfo, COL_RES_DL_DST, "User");
|
|
|
|
col_set_str(pinfo->cinfo, COL_RES_DL_SRC, "Network");
|
2002-10-31 07:12:42 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
pinfo->ctype = CT_ISDN;
|
|
|
|
pinfo->circuit_id = pinfo->pseudo_header->isdn.channel;
|
|
|
|
|
|
|
|
if (tree) {
|
2011-10-21 02:10:19 +00:00
|
|
|
ti = proto_tree_add_item(tree, proto_isdn, tvb, 0, 0, ENC_NA);
|
2002-10-31 07:12:42 +00:00
|
|
|
isdn_tree = proto_item_add_subtree(ti, ett_isdn);
|
|
|
|
|
|
|
|
proto_tree_add_uint(isdn_tree, hf_isdn_channel, tvb, 0, 0,
|
|
|
|
pinfo->pseudo_header->isdn.channel);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Set up a circuit for this channel, and assign it a dissector.
|
|
|
|
*/
|
2002-11-08 01:00:07 +00:00
|
|
|
circuit = find_circuit(pinfo->ctype, pinfo->circuit_id, pinfo->fd->num);
|
2002-10-31 07:12:42 +00:00
|
|
|
if (circuit == NULL)
|
2002-11-08 01:00:07 +00:00
|
|
|
circuit = circuit_new(pinfo->ctype, pinfo->circuit_id,
|
|
|
|
pinfo->fd->num);
|
2002-10-31 07:12:42 +00:00
|
|
|
|
|
|
|
if (circuit_get_dissector(circuit) == NULL) {
|
|
|
|
/*
|
|
|
|
* We don't yet know the type of traffic on the circuit.
|
|
|
|
*/
|
|
|
|
switch (pinfo->pseudo_header->isdn.channel) {
|
|
|
|
|
|
|
|
case 0:
|
|
|
|
/*
|
2011-11-05 20:47:11 +00:00
|
|
|
* D-channel. Dissect it with whatever protocol
|
|
|
|
* the user specified, or the default of LAPD if
|
|
|
|
* they didn't specify one.
|
2002-10-31 07:12:42 +00:00
|
|
|
*/
|
2011-11-05 20:47:11 +00:00
|
|
|
switch (dchannel_protocol) {
|
|
|
|
|
|
|
|
case DCHANNEL_LAPD:
|
|
|
|
circuit_set_dissector(circuit, lapd_handle);
|
|
|
|
break;
|
|
|
|
|
|
|
|
case DCHANNEL_DPNSS:
|
|
|
|
circuit_set_dissector(circuit,
|
|
|
|
dpnss_link_handle);
|
|
|
|
break;
|
|
|
|
}
|
2002-10-31 07:12:42 +00:00
|
|
|
break;
|
|
|
|
|
|
|
|
default:
|
|
|
|
/*
|
|
|
|
* B-channel.
|
|
|
|
*
|
|
|
|
* We don't know yet whether the datastream is
|
|
|
|
* V.120 or not; this heuristic tries to figure
|
|
|
|
* that out.
|
|
|
|
*
|
|
|
|
* We cannot glean this from the Q.931 SETUP message,
|
|
|
|
* because no commercial V.120 implementation I've
|
|
|
|
* seen actually sets the V.120 protocol discriminator
|
|
|
|
* (that, or I'm misreading the spec badly).
|
|
|
|
*
|
|
|
|
* TODO: close the circuit after a close on the B
|
|
|
|
* channel is detected.
|
|
|
|
*
|
|
|
|
* -Bert Driehuis (from the i4btrace reader;
|
|
|
|
* this heuristic was moved from there to
|
|
|
|
* here)
|
|
|
|
*
|
|
|
|
* XXX - I don't know that one can guarantee that
|
|
|
|
* the SABME will appear in the first frame on
|
|
|
|
* the channels, so we probably can't just say
|
|
|
|
* "it must be PPP" if we don't immediately see
|
|
|
|
* the V.120 SABME frame, so we do so only if
|
|
|
|
* we see the 0xFF 0x03. Unfortunately, that
|
|
|
|
* won't do the right thing if the PPP-over-HDLC
|
|
|
|
* headers aren't being used....
|
|
|
|
*/
|
2003-06-10 05:53:33 +00:00
|
|
|
if (tvb_memeql(tvb, 0, v120_sabme, 3) == 0) {
|
2002-10-31 07:12:42 +00:00
|
|
|
/*
|
|
|
|
* We assume this is V.120.
|
|
|
|
*/
|
|
|
|
circuit_set_dissector(circuit, v120_handle);
|
2003-06-10 05:53:33 +00:00
|
|
|
} else if (tvb_memeql(tvb, 0, ppp, 2) == 0) {
|
2002-10-31 07:12:42 +00:00
|
|
|
/*
|
|
|
|
* We assume this is PPP.
|
|
|
|
*/
|
|
|
|
circuit_set_dissector(circuit, ppp_hdlc_handle);
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!try_circuit_dissector(pinfo->ctype, pinfo->circuit_id,
|
2002-11-08 01:00:07 +00:00
|
|
|
pinfo->fd->num, tvb, pinfo, tree))
|
2002-10-31 07:12:42 +00:00
|
|
|
call_dissector(data_handle, tvb, pinfo, tree);
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
proto_register_isdn(void)
|
|
|
|
{
|
|
|
|
static hf_register_info hf[] = {
|
|
|
|
{ &hf_isdn_channel,
|
|
|
|
{ "Channel", "isdn.channel", FT_UINT8, BASE_DEC,
|
From Kovarththanan Rajaratnam via bug 3548:
(1) Trailing/leading spaces are removed from 'name's/'blurb's
(2) Duplicate 'blurb's are replaced with NULL
(3) Empty ("") 'blurb's are replaced with NULL
(4) BASE_NONE, NULL, 0x0 are used for 'display', 'strings' and 'bitmask' fields
for FT_NONE, FT_BYTES, FT_IPv4, FT_IPv6, FT_ABSOLUTE_TIME, FT_RELATIVE_TIME,
FT_PROTOCOL, FT_STRING and FT_STRINGZ field types
(5) Only allow non-zero value for 'display' if 'bitmask' is non-zero
svn path=/trunk/; revision=28770
2009-06-18 21:30:42 +00:00
|
|
|
VALS(channel_vals), 0x0, NULL, HFILL }},
|
2002-10-31 07:12:42 +00:00
|
|
|
};
|
|
|
|
static gint *ett[] = {
|
|
|
|
&ett_isdn,
|
|
|
|
};
|
2011-11-05 20:47:11 +00:00
|
|
|
module_t *isdn_module;
|
|
|
|
|
2002-10-31 07:12:42 +00:00
|
|
|
proto_isdn = proto_register_protocol("ISDN", "ISDN", "isdn");
|
|
|
|
proto_register_field_array(proto_isdn, hf, array_length(hf));
|
|
|
|
proto_register_subtree_array(ett, array_length(ett));
|
2011-11-05 20:47:11 +00:00
|
|
|
|
|
|
|
isdn_module = prefs_register_protocol(proto_isdn, NULL);
|
|
|
|
|
|
|
|
prefs_register_enum_preference(isdn_module, "dchannel_protocol",
|
|
|
|
"D-channel protocol",
|
|
|
|
"The protocol running on the D channel",
|
|
|
|
&dchannel_protocol, dchannel_protocol_options, FALSE);
|
2002-10-31 07:12:42 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
proto_reg_handoff_isdn(void)
|
|
|
|
{
|
|
|
|
dissector_handle_t isdn_handle;
|
|
|
|
|
|
|
|
/*
|
2011-11-05 20:47:11 +00:00
|
|
|
* Get handles for the LAPD, DPNSS link-layer, PPP, and V.120
|
|
|
|
* dissectors.
|
2002-10-31 07:12:42 +00:00
|
|
|
*/
|
|
|
|
lapd_handle = find_dissector("lapd");
|
2011-11-05 20:47:11 +00:00
|
|
|
dpnss_link_handle = find_dissector("dpnss_link");
|
2002-10-31 07:12:42 +00:00
|
|
|
ppp_hdlc_handle = find_dissector("ppp_hdlc");
|
|
|
|
v120_handle = find_dissector("v120");
|
|
|
|
data_handle = find_dissector("data");
|
|
|
|
|
|
|
|
isdn_handle = create_dissector_handle(dissect_isdn, proto_isdn);
|
|
|
|
|
2010-12-20 05:35:29 +00:00
|
|
|
dissector_add_uint("wtap_encap", WTAP_ENCAP_ISDN, isdn_handle);
|
2002-10-31 07:12:42 +00:00
|
|
|
}
|