410 lines
14 KiB
C
410 lines
14 KiB
C
/* packet-sm.c
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* Routines for Cisco Session Management Protocol dissection
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* Copyright 2004, Duncan Sargeant <dunc-ethereal@rcpt.to>
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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/*
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* This is basically a glue dissector for the Cisco SM protocol. It sits
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* between the RUDP and MTP3 layers in conversations on port 7000 between
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* SLTs and MGCs. A link to an overview of the technology :
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*
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* http://www.cisco.com/en/US/products/sw/netmgtsw/ps4883/products_installation_and_configuration_guide_chapter09186a008010950a.html
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*
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* Link showing debugs of the protocol:
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* http://www.cisco.com/univercd/cc/td/doc/product/access/sc/rel7/omts/omts_apb.htm#30052
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*
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* I'm unable to get local debugs of this protocol, as the SLT's are
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* slow cpu cisco 2600's, and they tend to drop the signalling links
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* if you turn any debugging on! But there's not much interesting
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* here, its just glue to get the ISUP/MTP3 data nicely.
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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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#define MESSAGE_TYPE_START 0
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#define MESSAGE_TYPE_STOP 1
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#define MESSAGE_TYPE_ACTIVE 2
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#define MESSAGE_TYPE_STANDBY 3
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#define MESSAGE_TYPE_Q_HOLD_INVOKE 4
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#define MESSAGE_TYPE_Q_HOLD_RESPONSE 5
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#define MESSAGE_TYPE_Q_RESUME_INVOKE 6
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#define MESSAGE_TYPE_Q_RESUME_RESPONSE 7
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#define MESSAGE_TYPE_Q_RESET_INVOKE 8
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#define MESSAGE_TYPE_Q_RESET_RESPONSE 9
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#define MESSAGE_TYPE_PDU 0x8000
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static const value_string sm_message_type_value[] = {
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{ MESSAGE_TYPE_START, "Start Message" },
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{ MESSAGE_TYPE_STOP, "Stop Message" },
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{ MESSAGE_TYPE_ACTIVE, "Active Message" },
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{ MESSAGE_TYPE_STANDBY, "Standby Message" },
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{ MESSAGE_TYPE_Q_HOLD_INVOKE, "Q_HOLD Invoke Message" },
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{ MESSAGE_TYPE_Q_HOLD_RESPONSE, "Q_HOLD Response Message" },
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{ MESSAGE_TYPE_Q_RESUME_INVOKE, "Q_RESUME Invoke Message" },
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{ MESSAGE_TYPE_Q_RESUME_RESPONSE, "Q_RESUME Response Message" },
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{ MESSAGE_TYPE_Q_RESET_INVOKE, "Q_RESET Invoke Message" },
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{ MESSAGE_TYPE_Q_RESET_RESPONSE, "Q_RESET Response Message" },
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{ MESSAGE_TYPE_PDU, "PDU Message" },
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{ 0, NULL }
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};
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static const value_string sm_message_type_value_info[] = {
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{ MESSAGE_TYPE_START, "Start" },
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{ MESSAGE_TYPE_STOP, "Stop" },
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{ MESSAGE_TYPE_ACTIVE, "Active" },
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{ MESSAGE_TYPE_STANDBY, "Standby" },
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{ MESSAGE_TYPE_Q_HOLD_INVOKE, "Q_HOLD Invoke" },
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{ MESSAGE_TYPE_Q_HOLD_RESPONSE, "Q_HOLD Response" },
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{ MESSAGE_TYPE_Q_RESUME_INVOKE, "Q_RESUME Invoke" },
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{ MESSAGE_TYPE_Q_RESUME_RESPONSE, "Q_RESUME Response" },
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{ MESSAGE_TYPE_Q_RESET_INVOKE, "Q_RESET Invoke" },
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{ MESSAGE_TYPE_Q_RESET_RESPONSE, "Q_RESET Response" },
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{ MESSAGE_TYPE_PDU, "PDU" },
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{ 0, NULL }
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};
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#define PDU_MTP3_TO_SLT 0x10
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#define PDU_MTP3_FROM_SLT 0x11
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#define PDU_SET_STATE 0x44
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#define PDU_RETURN_STATE 0x45
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static const value_string sm_pdu_type_value[] = {
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{ PDU_MTP3_TO_SLT, "mtp3 to SLT"},
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{ PDU_MTP3_FROM_SLT, "mtp3 from SLT"},
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{ PDU_SET_STATE, "set session state"},
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{ PDU_RETURN_STATE, "return session state"},
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{ 0, NULL }
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};
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/* TODO: Change to useful name once known */
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#define SM_PROTOCOL_X004 0x0004 /* https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=7188 */
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/* RUDP/SM stack called BSM V1 (version 1 versus Version 0 used for SS7). */
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#define SM_PROTOCOL_X100 0x0100
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#define SM_PROTOCOL_X101 0x0101
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#define SM_PROTOCOL_X114 0x0114
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#define SM_PROTOCOL_X122 0x0122
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/* Initialize the protocol and registered fields */
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static int proto_sm = -1;
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static int hf_sm_sm_msg_type = -1;
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static int hf_sm_protocol = -1;
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static int hf_sm_msg_id = -1;
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static int hf_sm_msg_type = -1;
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static int hf_sm_channel = -1;
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static int hf_sm_bearer = -1;
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static int hf_sm_len = -1;
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static int hf_sm_ip_addr = -1;
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static int hf_sm_context = -1;
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static int hf_sm_eisup_msg_id = -1;
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static int hf_sm_tag = -1;
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/* Initialize the subtree pointers */
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static gint ett_sm = -1;
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static dissector_handle_t sdp_handle;
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static dissector_handle_t mtp3_handle;
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static dissector_handle_t q931_handle;
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static dissector_handle_t data_handle;
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/* Code to actually dissect the packets */
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static void
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dissect_sm(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 *sm_tree;
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tvbuff_t *next_tvb = NULL;
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guint32 sm_message_type;
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guint16 protocol;
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guint16 msg_type = 0;
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guint16 length;
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guint16 tag;
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int offset = 0;
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sm_message_type = tvb_get_ntohl(tvb,offset);
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "SM");
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col_add_fstr(pinfo->cinfo, COL_INFO, "Cisco SM Packet (%s)",
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val_to_str_const(sm_message_type, sm_message_type_value_info,"reserved"));
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ti = proto_tree_add_item(tree, proto_sm, tvb, offset, 0, ENC_NA);
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sm_tree = proto_item_add_subtree(ti, ett_sm);
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proto_tree_add_uint_format(sm_tree, hf_sm_sm_msg_type, tvb, offset, 4, sm_message_type,
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"SM Message type: %s (0x%0x)", val_to_str_const(sm_message_type, sm_message_type_value, "reserved"), sm_message_type);
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offset = offset + 4;
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if (sm_message_type == MESSAGE_TYPE_PDU) {
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proto_tree_add_item(sm_tree, hf_sm_protocol, tvb, offset, 2, ENC_BIG_ENDIAN);
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protocol = tvb_get_ntohs(tvb,offset);
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offset = offset + 2;
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switch(protocol){
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/* start case RUDP BSM v.1 ---------------------------------------------------------- */
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case SM_PROTOCOL_X004:
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if (!tree)
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return;
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proto_tree_add_item(sm_tree, hf_sm_msg_id, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset = offset +2;
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msg_type = tvb_get_ntohs(tvb,offset);
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proto_tree_add_uint_format(sm_tree, hf_sm_msg_type, tvb, offset, 2, msg_type,
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"Message type: %s (0x%0x)", val_to_str_const(msg_type, sm_pdu_type_value, "reserved"),
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msg_type);
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msg_type = tvb_get_ntohs(tvb,offset);
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offset = offset + 2;
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proto_tree_add_item(sm_tree, hf_sm_channel, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset = offset + 2;
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proto_tree_add_item(sm_tree, hf_sm_bearer, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset = offset +2;
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proto_tree_add_item(sm_tree, hf_sm_len, tvb, offset, 2, ENC_BIG_ENDIAN);
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length = tvb_get_ntohs(tvb,offset);
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offset = offset +2;
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proto_item_set_len(ti, 16);
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if (length > 0) {
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next_tvb = tvb_new_subset(tvb, offset, length, length);
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if ((msg_type == PDU_MTP3_TO_SLT || msg_type == PDU_MTP3_FROM_SLT)) {
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call_dissector(q931_handle, next_tvb, pinfo, tree);
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} else {
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call_dissector(data_handle, next_tvb, pinfo, tree);
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}
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}
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break;
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/* end case RUDP BSM v.1 ---------------------------------------------------------- */
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case SM_PROTOCOL_X100:
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case SM_PROTOCOL_X122:
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if (!tree)
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return;
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/* Protocol 0x100/0x122 only contains a length and then an EISUP packet */
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proto_tree_add_item(sm_tree, hf_sm_len, tvb, offset, 2, ENC_BIG_ENDIAN);
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length = tvb_get_ntohs(tvb,offset);
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offset = offset + 2;
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proto_item_set_len(ti, 8);
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/* This should be the EISUP dissector but we havent got one
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* right now - so decode it as data for now ... */
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next_tvb = tvb_new_subset(tvb, offset, length, length);
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call_dissector(data_handle, next_tvb, pinfo, sm_tree);
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break;
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case SM_PROTOCOL_X101:
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if (!tree)
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return;
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/* XXX Reverse enginered so this may not be correct!!!
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* EISUP - used between Cisco HSI and Cisco PGW devices,
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* uses RUDP with default port number 8003.
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* Protocol stack is RUDP->Cisco SM->SDP.
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* This implementation is PROPRIETARY
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*/
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proto_tree_add_item(sm_tree, hf_sm_len, tvb, offset, 2, ENC_BIG_ENDIAN);
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length = tvb_get_ntohs(tvb,offset);
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offset = offset + 2;
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proto_item_set_len(ti, length + offset);
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/* The next stuff seems to be IP addr */
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proto_tree_add_item(sm_tree, hf_sm_ip_addr, tvb, offset, 4, ENC_BIG_ENDIAN);
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offset = offset + 4;
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/* This part looks to be the same per session */
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proto_tree_add_item(sm_tree, hf_sm_context, tvb, offset, 4, ENC_BIG_ENDIAN);
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offset = offset +4;
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/* Some sort of message type? */
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proto_tree_add_item(sm_tree, hf_sm_eisup_msg_id, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset = offset + 1;
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/* XXX Problem are tags 1 or two bytes???*/
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proto_tree_add_item(sm_tree, hf_sm_tag, tvb, offset, 2, ENC_BIG_ENDIAN);
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tag = tvb_get_ntohs(tvb,offset);
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offset = offset +2;
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if (tag== 0x01ac) {
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proto_tree_add_item(sm_tree, hf_sm_len, tvb, offset, 2, ENC_BIG_ENDIAN);
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length = tvb_get_ntohs(tvb,offset);
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offset = offset +2;
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next_tvb = tvb_new_subset(tvb, offset, length, length);
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call_dissector(sdp_handle, next_tvb, pinfo, sm_tree);
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offset = offset+length;
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}
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/*return;*/
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break;
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case SM_PROTOCOL_X114:
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if (!tree)
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return;
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/* XXX Reverse enginered so this may not be correct!!! */
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proto_tree_add_item(sm_tree, hf_sm_len, tvb, offset, 2, ENC_BIG_ENDIAN);
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length = tvb_get_ntohs(tvb,offset);
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offset = offset + 2;
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proto_item_set_len(ti, length + offset);
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/* The next stuff seems to be IP addr */
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proto_tree_add_item(sm_tree, hf_sm_ip_addr, tvb, offset, 4, ENC_BIG_ENDIAN);
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offset = offset + 4;
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proto_tree_add_item(sm_tree, hf_sm_context, tvb, offset, 4, ENC_BIG_ENDIAN);
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offset = offset +4;
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/* Some sort of message type? */
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proto_tree_add_item(sm_tree, hf_sm_eisup_msg_id, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset = offset + 1;
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/* XXX Problem are tags 1 or two bytes???*/
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proto_tree_add_item(sm_tree, hf_sm_tag, tvb, offset, 2, ENC_BIG_ENDIAN);
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tag = tvb_get_ntohs(tvb,offset);
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offset = offset +2;
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if (tag== 0x01ac) {
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proto_tree_add_item(sm_tree, hf_sm_len, tvb, offset, 2, ENC_BIG_ENDIAN);
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length = tvb_get_ntohs(tvb,offset);
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offset = offset +2;
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next_tvb = tvb_new_subset(tvb, offset, length, length);
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call_dissector(sdp_handle, next_tvb, pinfo, sm_tree);
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offset = offset+length;
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}
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break;
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default:
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proto_tree_add_item(sm_tree, hf_sm_msg_id, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset = offset +2;
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msg_type = tvb_get_ntohs(tvb,offset);
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proto_tree_add_uint_format(sm_tree, hf_sm_msg_type, tvb, offset, 2, msg_type,
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"Message type: %s (0x%0x)", val_to_str_const(msg_type, sm_pdu_type_value, "reserved"),
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msg_type);
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msg_type = tvb_get_ntohs(tvb,offset);
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offset = offset + 2;
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proto_tree_add_item(sm_tree, hf_sm_channel, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset = offset + 2;
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proto_tree_add_item(sm_tree, hf_sm_bearer, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset = offset +2;
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proto_tree_add_item(sm_tree, hf_sm_len, tvb, offset, 2, ENC_BIG_ENDIAN);
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length = tvb_get_ntohs(tvb,offset);
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offset = offset +2;
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proto_item_set_len(ti, 16);
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if (length > 0) {
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next_tvb = tvb_new_subset(tvb, offset, length, length);
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if ((msg_type == PDU_MTP3_TO_SLT || msg_type == PDU_MTP3_FROM_SLT)) {
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call_dissector(mtp3_handle, next_tvb, pinfo, tree);
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} else {
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call_dissector(data_handle, next_tvb, pinfo, tree);
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}
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}
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}
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}
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}
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void
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proto_register_sm(void)
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{
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static hf_register_info hf[] = {
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{ &hf_sm_sm_msg_type,
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{ "SM Message Type", "sm.sm_msg_type",
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FT_UINT32, BASE_HEX, NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_sm_protocol,
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{ "Protocol Type", "sm.protocol",
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FT_UINT16, BASE_HEX, NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_sm_msg_id,
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{ "Message ID", "sm.msgid",
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FT_UINT16, BASE_HEX, NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_sm_msg_type,
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{ "Message Type", "sm.msg_type",
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FT_UINT16, BASE_HEX, NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_sm_channel,
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{ "Channel ID", "sm.channel",
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FT_UINT16, BASE_HEX, NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_sm_bearer,
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{ "Bearer ID", "sm.bearer",
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FT_UINT16, BASE_HEX, NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_sm_len,
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{ "Length", "sm.len",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_sm_ip_addr,
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{ "IPv4 address","sm.ip_addr",
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FT_IPv4,BASE_NONE, NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_sm_context,
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{ "Context","sm.context",
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FT_UINT32, BASE_DEC, NULL, 0x0,
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"Context(guesswork!)", HFILL }
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},
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{ &hf_sm_eisup_msg_id,
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{ "Message id","sm.eisup_message_id",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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"Message id(guesswork!)", HFILL }
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},
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{ &hf_sm_tag,
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{ "Tag","sm.tag",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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"Tag(guesswork!)", HFILL }
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},
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};
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/* Setup protocol subtree array */
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static gint *ett[] = {
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&ett_sm,
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};
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/* Register the protocol name and description */
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proto_sm = proto_register_protocol("Cisco Session Management",
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"SM", "sm");
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register_dissector("sm", dissect_sm, proto_sm);
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/* Required function calls to register the header fields and subtrees used */
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proto_register_field_array(proto_sm, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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void
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proto_reg_handoff_sm(void)
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{
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sdp_handle = find_dissector("sdp");
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mtp3_handle = find_dissector("mtp3");
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q931_handle = find_dissector("q931");
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data_handle = find_dissector("data");
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}
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