e08522f0dd
rudp looks up the ciscosm dissector for every single packet. Make this a one time in proto_handoff and use the dissector handle. While at it - decode the checksum when there is one. An indicator is that the header length has space for the checksum. Additionally we have seen "stray bytes" after the checksum we can't explain. So decode them as data when there are some. svn path=/trunk/; revision=26427
362 lines
12 KiB
C
362 lines
12 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., 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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/* TODO: Change to useful name once known */
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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 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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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, offset, 0, FALSE);
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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(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, FALSE);
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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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case SM_PROTOCOL_X100:
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case SM_PROTOCOL_X122:
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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, FALSE);
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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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/* XXX Reveres 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, FALSE);
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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, FALSE);
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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, FALSE);
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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, FALSE);
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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, FALSE);
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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, FALSE);
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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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/* XXX Reveres enginered so this may not be correct!!! */
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proto_tree_add_item(sm_tree, hf_sm_len, tvb, offset, 2, FALSE);
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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, FALSE);
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offset = offset + 4;
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proto_tree_add_item(sm_tree, hf_sm_context, tvb, offset, 4, FALSE);
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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, FALSE);
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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, FALSE);
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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, FALSE);
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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, FALSE);
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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(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, FALSE);
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offset = offset + 2;
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proto_tree_add_item(sm_tree, hf_sm_bearer, tvb, offset, 2, FALSE);
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offset = offset +2;
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proto_tree_add_item(sm_tree, hf_sm_len, tvb, offset, 2, FALSE);
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offset = offset +2;
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proto_item_set_len(ti, 16);
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}
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}
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}
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if (sm_message_type == MESSAGE_TYPE_PDU) {
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next_tvb = tvb_new_subset(tvb, offset, -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_reg_handoff_sm(void)
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{
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sdp_handle = find_dissector("sdp");
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data_handle = find_dissector("data");
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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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{ &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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"IPv4 address", 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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