234 lines
8 KiB
C
234 lines
8 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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* Copied from WHATEVER_FILE_YOU_USED (where "WHATEVER_FILE_YOU_USED"
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* is a dissector file; if you just copied this from README.developer,
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* don't bother with the "Copied from" - you don't even need to put
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* in a "Copied from" if you copied an existing dissector, especially
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* if the bulk of the code in the new dissector is your code)
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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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/*
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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 <stdio.h>
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#include <stdlib.h>
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#include <string.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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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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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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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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/* 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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/* Initialize the subtree pointers */
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static gint ett_sm = -1;
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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 msg_type;
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sm_message_type = tvb_get_ntohl(tvb,0);
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "SM");
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if (check_col(pinfo->cinfo, COL_INFO))
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col_add_fstr(pinfo->cinfo, COL_INFO, "Cisco SM Packet (%s)",
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val_to_str(sm_message_type, sm_message_type_value_info,"reserved"));
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if (tree) {
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ti = proto_tree_add_item(tree, proto_sm, tvb, 0, 16, FALSE);
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sm_tree = proto_item_add_subtree(ti, ett_sm);
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ti = proto_tree_add_uint_format(sm_tree, hf_sm_sm_msg_type, tvb, 0, 4, sm_message_type,
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"SM Message type: %s (0x%0x)", val_to_str(sm_message_type, sm_message_type_value, "reserved"), sm_message_type);
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if (sm_message_type == MESSAGE_TYPE_PDU) {
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ti = proto_tree_add_item(sm_tree, hf_sm_protocol, tvb, 4, 2, FALSE);
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ti = proto_tree_add_item(sm_tree, hf_sm_msg_id, tvb, 6, 2, FALSE);
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msg_type = tvb_get_ntohs(tvb,8);
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ti = proto_tree_add_uint_format(sm_tree, hf_sm_msg_type, tvb, 0, 4, msg_type,
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"Message type: %s (0x%0x)", val_to_str(msg_type, sm_pdu_type_value, "reserved"), msg_type);
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ti = proto_tree_add_item(sm_tree, hf_sm_channel, tvb, 10, 2, FALSE);
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ti = proto_tree_add_item(sm_tree, hf_sm_bearer, tvb, 12, 2, FALSE);
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ti = proto_tree_add_item(sm_tree, hf_sm_len, tvb, 14, 2, FALSE);
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}
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}
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if (sm_message_type == MESSAGE_TYPE_PDU) {
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msg_type = tvb_get_ntohs(tvb,8);
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next_tvb = tvb_new_subset(tvb, 16, -1, -1);
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if ((msg_type == PDU_MTP3_TO_SLT || msg_type == PDU_MTP3_FROM_SLT) && tvb_length(next_tvb) && find_dissector("mtp3"))
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call_dissector(find_dissector("mtp3"), next_tvb, pinfo, tree);
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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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"", 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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"", 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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"", 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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"", 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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"", 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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"", 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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"", 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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