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|
/* packet-sm.c
* Routines for Cisco Session Management Protocol dissection
* Copyright 2004, Duncan Sargeant <dunc-ethereal@rcpt.to>
*
* $Id$
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/*
* This is basically a glue dissector for the Cisco SM protocol. It sits
* between the RUDP and MTP3 layers in conversations on port 7000 between
* SLTs and MGCs. A link to an overview of the technology :
*
* http://www.cisco.com/en/US/products/sw/netmgtsw/ps4883/products_installation_and_configuration_guide_chapter09186a008010950a.html
*
* Link showing debugs of the protocol:
* http://www.cisco.com/univercd/cc/td/doc/product/access/sc/rel7/omts/omts_apb.htm#30052
*
* I'm unable to get local debugs of this protocol, as the SLT's are
* slow cpu cisco 2600's, and they tend to drop the signalling links
* if you turn any debugging on! But there's not much interesting
* here, its just glue to get the ISUP/MTP3 data nicely.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <glib.h>
#include <epan/packet.h>
#define MESSAGE_TYPE_START 0
#define MESSAGE_TYPE_STOP 1
#define MESSAGE_TYPE_ACTIVE 2
#define MESSAGE_TYPE_STANDBY 3
#define MESSAGE_TYPE_Q_HOLD_INVOKE 4
#define MESSAGE_TYPE_Q_HOLD_RESPONSE 5
#define MESSAGE_TYPE_Q_RESUME_INVOKE 6
#define MESSAGE_TYPE_Q_RESUME_RESPONSE 7
#define MESSAGE_TYPE_Q_RESET_INVOKE 8
#define MESSAGE_TYPE_Q_RESET_RESPONSE 9
#define MESSAGE_TYPE_PDU 0x8000
static const value_string sm_message_type_value[] = {
{ MESSAGE_TYPE_START, "Start Message" },
{ MESSAGE_TYPE_STOP, "Stop Message" },
{ MESSAGE_TYPE_ACTIVE, "Active Message" },
{ MESSAGE_TYPE_STANDBY, "Standby Message" },
{ MESSAGE_TYPE_Q_HOLD_INVOKE, "Q_HOLD Invoke Message" },
{ MESSAGE_TYPE_Q_HOLD_RESPONSE, "Q_HOLD Response Message" },
{ MESSAGE_TYPE_Q_RESUME_INVOKE, "Q_RESUME Invoke Message" },
{ MESSAGE_TYPE_Q_RESUME_RESPONSE, "Q_RESUME Response Message" },
{ MESSAGE_TYPE_Q_RESET_INVOKE, "Q_RESET Invoke Message" },
{ MESSAGE_TYPE_Q_RESET_RESPONSE, "Q_RESET Response Message" },
{ MESSAGE_TYPE_PDU, "PDU Message" },
{ 0, NULL }
};
static const value_string sm_message_type_value_info[] = {
{ MESSAGE_TYPE_START, "Start" },
{ MESSAGE_TYPE_STOP, "Stop" },
{ MESSAGE_TYPE_ACTIVE, "Active" },
{ MESSAGE_TYPE_STANDBY, "Standby" },
{ MESSAGE_TYPE_Q_HOLD_INVOKE, "Q_HOLD Invoke" },
{ MESSAGE_TYPE_Q_HOLD_RESPONSE, "Q_HOLD Response" },
{ MESSAGE_TYPE_Q_RESUME_INVOKE, "Q_RESUME Invoke" },
{ MESSAGE_TYPE_Q_RESUME_RESPONSE, "Q_RESUME Response" },
{ MESSAGE_TYPE_Q_RESET_INVOKE, "Q_RESET Invoke" },
{ MESSAGE_TYPE_Q_RESET_RESPONSE, "Q_RESET Response" },
{ MESSAGE_TYPE_PDU, "PDU" },
{ 0, NULL }
};
#define PDU_MTP3_TO_SLT 0x10
#define PDU_MTP3_FROM_SLT 0x11
#define PDU_SET_STATE 0x44
#define PDU_RETURN_STATE 0x45
static const value_string sm_pdu_type_value[] = {
{ PDU_MTP3_TO_SLT, "mtp3 to SLT"},
{ PDU_MTP3_FROM_SLT, "mtp3 from SLT"},
{ PDU_SET_STATE, "set session state"},
{ PDU_RETURN_STATE, "return session state"},
{ 0, NULL }
};
/* TODO: Change to useful name once known */
#define SM_PROTOCOL_X004 0x0004 /* https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=7188 */
/* RUDP/SM stack called BSM V1 (version 1 versus Version 0 used for SS7). */
#define SM_PROTOCOL_X100 0x0100
#define SM_PROTOCOL_X101 0x0101
#define SM_PROTOCOL_X114 0x0114
#define SM_PROTOCOL_X122 0x0122
/* Initialize the protocol and registered fields */
static int proto_sm = -1;
static int hf_sm_sm_msg_type = -1;
static int hf_sm_protocol = -1;
static int hf_sm_msg_id = -1;
static int hf_sm_msg_type = -1;
static int hf_sm_channel = -1;
static int hf_sm_bearer = -1;
static int hf_sm_len = -1;
static int hf_sm_ip_addr = -1;
static int hf_sm_context = -1;
static int hf_sm_eisup_msg_id = -1;
static int hf_sm_tag = -1;
/* Initialize the subtree pointers */
static gint ett_sm = -1;
static dissector_handle_t sdp_handle;
static dissector_handle_t mtp3_handle;
static dissector_handle_t q931_handle;
static dissector_handle_t data_handle;
/* Code to actually dissect the packets */
static void
dissect_sm(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
proto_item *ti;
proto_tree *sm_tree;
tvbuff_t *next_tvb = NULL;
guint32 sm_message_type;
guint16 protocol;
guint16 msg_type = 0;
guint16 length;
guint16 tag;
int offset = 0;
sm_message_type = tvb_get_ntohl(tvb,offset);
col_set_str(pinfo->cinfo, COL_PROTOCOL, "SM");
col_add_fstr(pinfo->cinfo, COL_INFO, "Cisco SM Packet (%s)",
val_to_str(sm_message_type, sm_message_type_value_info,"reserved"));
ti = proto_tree_add_item(tree, proto_sm, tvb, offset, 0, ENC_NA);
sm_tree = proto_item_add_subtree(ti, ett_sm);
proto_tree_add_uint_format(sm_tree, hf_sm_sm_msg_type, tvb, offset, 4, sm_message_type,
"SM Message type: %s (0x%0x)", val_to_str(sm_message_type, sm_message_type_value, "reserved"), sm_message_type);
offset = offset + 4;
if (sm_message_type == MESSAGE_TYPE_PDU) {
proto_tree_add_item(sm_tree, hf_sm_protocol, tvb, offset, 2, ENC_BIG_ENDIAN);
protocol = tvb_get_ntohs(tvb,offset);
offset = offset + 2;
switch(protocol){
/* start case RUDP BSM v.1 ---------------------------------------------------------- */
case SM_PROTOCOL_X004:
if (!tree)
return;
proto_tree_add_item(sm_tree, hf_sm_msg_id, tvb, offset, 2, ENC_BIG_ENDIAN);
offset = offset +2;
msg_type = tvb_get_ntohs(tvb,offset);
proto_tree_add_uint_format(sm_tree, hf_sm_msg_type, tvb, offset, 2, msg_type,
"Message type: %s (0x%0x)", val_to_str(msg_type, sm_pdu_type_value, "reserved"),
msg_type);
msg_type = tvb_get_ntohs(tvb,offset);
offset = offset + 2;
proto_tree_add_item(sm_tree, hf_sm_channel, tvb, offset, 2, ENC_BIG_ENDIAN);
offset = offset + 2;
proto_tree_add_item(sm_tree, hf_sm_bearer, tvb, offset, 2, ENC_BIG_ENDIAN);
offset = offset +2;
proto_tree_add_item(sm_tree, hf_sm_len, tvb, offset, 2, ENC_BIG_ENDIAN);
length = tvb_get_ntohs(tvb,offset);
offset = offset +2;
proto_item_set_len(ti, 16);
if (length > 0) {
next_tvb = tvb_new_subset(tvb, offset, length, length);
if ((msg_type == PDU_MTP3_TO_SLT || msg_type == PDU_MTP3_FROM_SLT)) {
call_dissector(q931_handle, next_tvb, pinfo, tree);
} else {
call_dissector(data_handle, next_tvb, pinfo, tree);
}
}
break;
/* end case RUDP BSM v.1 ---------------------------------------------------------- */
case SM_PROTOCOL_X100:
case SM_PROTOCOL_X122:
if (!tree)
return;
/* Protocol 0x100/0x122 only contains a length and then an EISUP packet */
proto_tree_add_item(sm_tree, hf_sm_len, tvb, offset, 2, ENC_BIG_ENDIAN);
length = tvb_get_ntohs(tvb,offset);
offset = offset + 2;
proto_item_set_len(ti, 8);
/* This should be the EISUP dissector but we havent got one
* right now - so decode it as data for now ... */
next_tvb = tvb_new_subset(tvb, offset, length, length);
call_dissector(data_handle, next_tvb, pinfo, sm_tree);
break;
case SM_PROTOCOL_X101:
if (!tree)
return;
/* XXX Reverse enginered so this may not be correct!!!
* EISUP - used between Cisco HSI and Cisco PGW devices,
* uses RUDP with default port number 8003.
* Protocol stack is RUDP->Cisco SM->SDP.
* This implementation is PROPRIETARY
*/
proto_tree_add_item(sm_tree, hf_sm_len, tvb, offset, 2, ENC_BIG_ENDIAN);
length = tvb_get_ntohs(tvb,offset);
offset = offset + 2;
proto_item_set_len(ti, length + offset);
/* The next stuff seems to be IP addr */
proto_tree_add_item(sm_tree, hf_sm_ip_addr, tvb, offset, 4, ENC_BIG_ENDIAN);
offset = offset + 4;
/* This part looks to be the same per session */
proto_tree_add_item(sm_tree, hf_sm_context, tvb, offset, 4, ENC_BIG_ENDIAN);
offset = offset +4;
/* Some sort of message type? */
proto_tree_add_item(sm_tree, hf_sm_eisup_msg_id, tvb, offset, 1, ENC_BIG_ENDIAN);
offset = offset + 1;
/* XXX Problem are tags 1 or two bytes???*/
proto_tree_add_item(sm_tree, hf_sm_tag, tvb, offset, 2, ENC_BIG_ENDIAN);
tag = tvb_get_ntohs(tvb,offset);
offset = offset +2;
if (tag== 0x01ac) {
proto_tree_add_item(sm_tree, hf_sm_len, tvb, offset, 2, ENC_BIG_ENDIAN);
length = tvb_get_ntohs(tvb,offset);
offset = offset +2;
next_tvb = tvb_new_subset(tvb, offset, length, length);
call_dissector(sdp_handle, next_tvb, pinfo, sm_tree);
offset = offset+length;
}
/*return;*/
break;
case SM_PROTOCOL_X114:
if (!tree)
return;
/* XXX Reverse enginered so this may not be correct!!! */
proto_tree_add_item(sm_tree, hf_sm_len, tvb, offset, 2, ENC_BIG_ENDIAN);
length = tvb_get_ntohs(tvb,offset);
offset = offset + 2;
proto_item_set_len(ti, length + offset);
/* The next stuff seems to be IP addr */
proto_tree_add_item(sm_tree, hf_sm_ip_addr, tvb, offset, 4, ENC_BIG_ENDIAN);
offset = offset + 4;
proto_tree_add_item(sm_tree, hf_sm_context, tvb, offset, 4, ENC_BIG_ENDIAN);
offset = offset +4;
/* Some sort of message type? */
proto_tree_add_item(sm_tree, hf_sm_eisup_msg_id, tvb, offset, 1, ENC_BIG_ENDIAN);
offset = offset + 1;
/* XXX Problem are tags 1 or two bytes???*/
proto_tree_add_item(sm_tree, hf_sm_tag, tvb, offset, 2, ENC_BIG_ENDIAN);
tag = tvb_get_ntohs(tvb,offset);
offset = offset +2;
if (tag== 0x01ac) {
proto_tree_add_item(sm_tree, hf_sm_len, tvb, offset, 2, ENC_BIG_ENDIAN);
length = tvb_get_ntohs(tvb,offset);
offset = offset +2;
next_tvb = tvb_new_subset(tvb, offset, length, length);
call_dissector(sdp_handle, next_tvb, pinfo, sm_tree);
offset = offset+length;
}
break;
default:
proto_tree_add_item(sm_tree, hf_sm_msg_id, tvb, offset, 2, ENC_BIG_ENDIAN);
offset = offset +2;
msg_type = tvb_get_ntohs(tvb,offset);
proto_tree_add_uint_format(sm_tree, hf_sm_msg_type, tvb, offset, 2, msg_type,
"Message type: %s (0x%0x)", val_to_str(msg_type, sm_pdu_type_value, "reserved"),
msg_type);
msg_type = tvb_get_ntohs(tvb,offset);
offset = offset + 2;
proto_tree_add_item(sm_tree, hf_sm_channel, tvb, offset, 2, ENC_BIG_ENDIAN);
offset = offset + 2;
proto_tree_add_item(sm_tree, hf_sm_bearer, tvb, offset, 2, ENC_BIG_ENDIAN);
offset = offset +2;
proto_tree_add_item(sm_tree, hf_sm_len, tvb, offset, 2, ENC_BIG_ENDIAN);
length = tvb_get_ntohs(tvb,offset);
offset = offset +2;
proto_item_set_len(ti, 16);
if (length > 0) {
next_tvb = tvb_new_subset(tvb, offset, length, length);
if ((msg_type == PDU_MTP3_TO_SLT || msg_type == PDU_MTP3_FROM_SLT)) {
call_dissector(mtp3_handle, next_tvb, pinfo, tree);
} else {
call_dissector(data_handle, next_tvb, pinfo, tree);
}
}
}
}
}
void
proto_register_sm(void)
{
static hf_register_info hf[] = {
{ &hf_sm_sm_msg_type,
{ "SM Message Type", "sm.sm_msg_type",
FT_UINT32, BASE_HEX, NULL, 0x0,
NULL, HFILL }
},
{ &hf_sm_protocol,
{ "Protocol Type", "sm.protocol",
FT_UINT16, BASE_HEX, NULL, 0x0,
NULL, HFILL }
},
{ &hf_sm_msg_id,
{ "Message ID", "sm.msgid",
FT_UINT16, BASE_HEX, NULL, 0x0,
NULL, HFILL }
},
{ &hf_sm_msg_type,
{ "Message Type", "sm.msg_type",
FT_UINT16, BASE_HEX, NULL, 0x0,
NULL, HFILL }
},
{ &hf_sm_channel,
{ "Channel ID", "sm.channel",
FT_UINT16, BASE_HEX, NULL, 0x0,
NULL, HFILL }
},
{ &hf_sm_bearer,
{ "Bearer ID", "sm.bearer",
FT_UINT16, BASE_HEX, NULL, 0x0,
NULL, HFILL }
},
{ &hf_sm_len,
{ "Length", "sm.len",
FT_UINT16, BASE_DEC, NULL, 0x0,
NULL, HFILL }
},
{ &hf_sm_ip_addr,
{ "IPv4 address","sm.ip_addr",
FT_IPv4,BASE_NONE, NULL, 0x0,
NULL, HFILL }
},
{ &hf_sm_context,
{ "Context","sm.context",
FT_UINT32, BASE_DEC, NULL, 0x0,
"Context(guesswork!)", HFILL }
},
{ &hf_sm_eisup_msg_id,
{ "Message id","sm.eisup_message_id",
FT_UINT8, BASE_DEC, NULL, 0x0,
"Message id(guesswork!)", HFILL }
},
{ &hf_sm_tag,
{ "Tag","sm.tag",
FT_UINT16, BASE_DEC, NULL, 0x0,
"Tag(guesswork!)", HFILL }
},
};
/* Setup protocol subtree array */
static gint *ett[] = {
&ett_sm,
};
/* Register the protocol name and description */
proto_sm = proto_register_protocol("Cisco Session Management",
"SM", "sm");
register_dissector("sm", dissect_sm, proto_sm);
/* Required function calls to register the header fields and subtrees used */
proto_register_field_array(proto_sm, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
void
proto_reg_handoff_sm(void)
{
sdp_handle = find_dissector("sdp");
mtp3_handle = find_dissector("mtp3");
q931_handle = find_dissector("q931");
data_handle = find_dissector("data");
}
|
