![Anders Broman](/assets/img/avatar_default.png)
RSL is on more than stream-id == 0 https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=4245 svn path=/trunk/; revision=31013
299 lines
7.9 KiB
C
299 lines
7.9 KiB
C
/* packet-gsm_ipa.c
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* Routines for packet dissection of ip.access GSM over IP
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* Copyright 2009 by Harald Welte <laforge@gnumonks.org>
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* Copyright 2009 by Holger Hans Peter Freyther <zecke@selfish.org>
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*
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* $Id$
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <glib.h>
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#include <epan/packet.h>
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/* Initialize the protocol and registered fields */
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static int proto_ipa = -1;
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static int proto_ipaccess = -1;
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static int hf_ipa_data_len = -1;
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static int hf_ipa_protocol = -1;
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static int hf_ipaccess_msgtype = -1;
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static int hf_ipaccess_attr_tag = -1;
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static int hf_ipaccess_attr_string = -1;
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/* Initialize the subtree pointers */
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static gint ett_ipa = -1;
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static gint ett_ipaccess = -1;
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enum {
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SUB_OML,
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SUB_RSL,
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SUB_SCCP,
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/* SUB_IPACCESS, */
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SUB_MAX
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};
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static dissector_handle_t sub_handles[SUB_MAX];
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#define TCP_PORT_ABISIP_PRIM 3002
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#define TCP_PORT_ABISIP_SEC 3003
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#define TCP_PORT_ABISIP_INST 3006
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#define TCP_PORT_AIP_PRIM 5000
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#define ABISIP_RSL_MAX 0x20
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#define AIP_SCCP 0xfd
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#define ABISIP_IPACCESS 0xfe
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#define ABISIP_OML 0xff
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static const value_string ipa_protocol_vals[] = {
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{ 0x00, "RSL" },
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{ 0xfd, "SCCP" },
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{ 0xfe, "IPA" },
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{ 0xff, "OML" },
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{ 0, NULL }
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};
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static const value_string ipaccess_msgtype_vals[] = {
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{ 0x00, "PING?" },
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{ 0x01, "PONG!" },
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{ 0x04, "IDENTITY REQUEST" },
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{ 0x05, "IDENTITY RESPONSE" },
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{ 0x06, "IDENTITY ACK" },
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{ 0x07, "IDENTITY NACK" },
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{ 0x08, "PROXY REQUEST" },
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{ 0x09, "PROXY ACK" },
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{ 0x0a, "PROXY NACK" },
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{ 0, NULL }
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};
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static const value_string ipaccess_idtag_vals[] = {
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{ 0x00, "Serial Number" },
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{ 0x01, "Unit Name" },
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{ 0x02, "Location" },
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{ 0x03, "Unit Type" },
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{ 0x04, "Equipment Version" },
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{ 0x05, "Software Version" },
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{ 0x06, "IP Address" },
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{ 0x07, "MAC Address" },
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{ 0x08, "Unit ID" },
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{ 0, NULL }
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};
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static gint
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dissect_ipa_attr(tvbuff_t *tvb, int base_offs, proto_tree *tree)
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{
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guint8 len, attr_type;
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int offset = base_offs;
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while (tvb_reported_length_remaining(tvb, offset) > 0) {
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attr_type = tvb_get_guint8(tvb, offset);
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switch (attr_type) {
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case 0x00: /* a string prefixed by its length */
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len = tvb_get_guint8(tvb, offset+1);
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proto_tree_add_item(tree, hf_ipaccess_attr_tag,
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tvb, offset+2, 1, FALSE);
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proto_tree_add_item(tree, hf_ipaccess_attr_string,
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tvb, offset+3, len-1, FALSE);
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break;
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case 0x01: /* a single-byte reqest for a certain attr */
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len = 0;
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proto_tree_add_item(tree, hf_ipaccess_attr_tag,
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tvb, offset+1, 1, FALSE);
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break;
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default:
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len = 0;
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proto_tree_add_text(tree, tvb, offset+1, 1,
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"unknown attribute type 0x%02x",
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attr_type);
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break;
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};
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offset += len + 2;
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};
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return offset;
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}
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/* Dissect an ip.access specific message */
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static gint
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dissect_ipaccess(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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proto_item *ti;
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proto_tree *ipaccess_tree;
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guint8 msg_type;
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msg_type = tvb_get_guint8(tvb, 0);
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col_append_fstr(pinfo->cinfo, COL_INFO, "%s ",
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val_to_str(msg_type, ipaccess_msgtype_vals,
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"unknown 0x%02x"));
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if (tree) {
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ti = proto_tree_add_item(tree, proto_ipaccess, tvb, 0, -1, FALSE);
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ipaccess_tree = proto_item_add_subtree(ti, ett_ipaccess);
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proto_tree_add_item(ipaccess_tree, hf_ipaccess_msgtype,
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tvb, 0, 1, FALSE);
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switch (msg_type) {
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case 4:
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case 5:
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dissect_ipa_attr(tvb, 1, ipaccess_tree);
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break;
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}
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}
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return 1;
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}
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/* Code to actually dissect the packets */
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static void
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dissect_ipa(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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int offset = 0;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "IPA");
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col_clear(pinfo->cinfo, COL_INFO);
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while (tvb_reported_length_remaining(tvb, offset) > 0) {
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proto_item *ti;
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proto_tree *ipa_tree;
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guint16 len, msg_type;
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tvbuff_t *next_tvb;
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len = tvb_get_ntohs(tvb, offset);
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msg_type = tvb_get_guint8(tvb, offset+2);
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col_append_fstr(pinfo->cinfo, COL_INFO, "%s ",
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val_to_str(msg_type, ipa_protocol_vals,
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"unknown 0x%02x"));
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if (tree) {
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ti = proto_tree_add_protocol_format(tree, proto_ipa,
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tvb, offset, len+3,
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"IPA protocol ip.access, type: %s",
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val_to_str(msg_type, ipa_protocol_vals,
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"unknown 0x%02x"));
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ipa_tree = proto_item_add_subtree(ti, ett_ipa);
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proto_tree_add_item(ipa_tree, hf_ipa_data_len,
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tvb, offset+1, 1, FALSE);
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proto_tree_add_item(ipa_tree, hf_ipa_protocol,
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tvb, offset+2, 1, FALSE);
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}
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next_tvb = tvb_new_subset(tvb, offset+3, len, len);
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switch (msg_type) {
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case ABISIP_OML:
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/* hand this off to the standard A-bis OML dissector */
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if (sub_handles[SUB_OML])
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call_dissector(sub_handles[SUB_OML], next_tvb,
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pinfo, tree);
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break;
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case ABISIP_IPACCESS:
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dissect_ipaccess(next_tvb, pinfo, tree);
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break;
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case AIP_SCCP:
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/* hand this off to the standard SCCP dissector */
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call_dissector(sub_handles[SUB_SCCP], next_tvb, pinfo, tree);
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break;
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default:
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if (msg_type < ABISIP_RSL_MAX) {
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/* hand this off to the standard A-bis RSL dissector */
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call_dissector(sub_handles[SUB_RSL], next_tvb, pinfo, tree);
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}
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break;
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}
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offset += len + 3;
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}
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}
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void proto_register_ipa(void)
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{
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static hf_register_info hf[] = {
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{&hf_ipa_data_len,
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{"DataLen", "ipa.data_len",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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"The length of the data (in bytes)", HFILL}
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},
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{&hf_ipa_protocol,
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{"Protocol", "ipa.protocol",
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FT_UINT8, BASE_HEX, VALS(ipa_protocol_vals), 0x0,
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"The IPA Sub-Protocol", HFILL}
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},
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};
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static hf_register_info hf_ipa[] = {
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{&hf_ipaccess_msgtype,
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{"MessageType", "ipaccess.msg_type",
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FT_UINT8, BASE_HEX, VALS(ipaccess_msgtype_vals), 0x0,
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"Type of ip.access messsage", HFILL}
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},
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{&hf_ipaccess_attr_tag,
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{"Tag", "ipaccess.attr_tag",
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FT_UINT8, BASE_HEX, VALS(ipaccess_idtag_vals), 0x0,
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"Attribute Tag", HFILL}
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},
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{&hf_ipaccess_attr_string,
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{"String", "ipaccess.attr_string",
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FT_STRING, BASE_NONE, NULL, 0x0,
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"String attribute", HFILL}
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},
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};
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static gint *ett[] = {
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&ett_ipa,
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&ett_ipaccess,
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};
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proto_ipa =
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proto_register_protocol("GSM over IP protocol as used by ip.access",
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"GSM over IP", "gsm_ipa");
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proto_ipaccess =
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proto_register_protocol("GSM over IP ip.access CCM sub-protocol",
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"IPA", "ipaccess");
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proto_register_field_array(proto_ipa, hf, array_length(hf));
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proto_register_field_array(proto_ipaccess, hf_ipa, array_length(hf_ipa));
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proto_register_subtree_array(ett, array_length(ett));
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register_dissector("gsm_ipa", dissect_ipa, proto_ipa);
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}
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void proto_reg_handoff_gsm_ipa(void)
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{
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dissector_handle_t ipa_handle;
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sub_handles[SUB_RSL] = find_dissector("gsm_abis_rsl");
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sub_handles[SUB_OML] = find_dissector("gsm_abis_oml");
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sub_handles[SUB_SCCP] = find_dissector("sccp");
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ipa_handle = create_dissector_handle(dissect_ipa, proto_ipa);
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dissector_add("tcp.port", TCP_PORT_ABISIP_PRIM, ipa_handle);
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dissector_add("tcp.port", TCP_PORT_ABISIP_SEC, ipa_handle);
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dissector_add("tcp.port", TCP_PORT_ABISIP_INST, ipa_handle);
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dissector_add("tcp.port", TCP_PORT_AIP_PRIM, ipa_handle);
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dissector_add("udp.port", TCP_PORT_ABISIP_INST, ipa_handle);
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}
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