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/* packet-msmms-data.c
*
* Routines for MSMMS data message dissection
* MMS = Microsoft Media Server
*
* Copyright 2005
* Written by Martin Mathieson
*
* $Id: packet-rdt.c 14456 2005-05-27 18:35:19Z etxrab $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@ethereal.com>
* 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.
*/
/* Information sources:
* sdp.ppona.com
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <glib.h>
#include <stdio.h>
#include <string.h>
#include <epan/packet.h>
#include <epan/conversation.h>
static dissector_handle_t msmms_data_handle;
static gint proto_msmms_data = -1;
/* Fields */
/* Pre-header fields */
static gint hf_msmms_data_sequence_number = -1;
static gint hf_msmms_data_packet_id_type = -1;
static gint hf_msmms_data_packet_length = -1;
/* UDP command fields */
static gint hf_msmms_data_header_id = -1;
static gint hf_msmms_data_client_id = -1;
static gint hf_msmms_data_command_id = -1;
static gint hf_msmms_data_packet_to_resend = -1;
static gint ett_msmms_data = -1;
#define MSMMS_UDP_COMMAND_PORT 1755
/* Parse the only known UDP command (0x01) */
static void dissect_msmms_data_udp_command(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
gint offset = 0;
/* Header ID */
proto_tree_add_item(tree, hf_msmms_data_header_id, tvb, offset, 4, TRUE);
offset += 4;
/* Client ID */
proto_tree_add_item(tree, hf_msmms_data_client_id, tvb, offset, 4, TRUE);
offset += 4;
/* Command ID */
proto_tree_add_item(tree, hf_msmms_data_command_id, tvb, offset, 2, TRUE);
offset += 4;
if (check_col(pinfo->cinfo, COL_INFO))
{
col_add_str(pinfo->cinfo, COL_INFO, "Request to resend packet(s):");
}
/* Show list of packets to resend */
while (tvb_length_remaining(tvb, offset) >= 4)
{
guint32 packet_number = tvb_get_letohl(tvb, offset);
proto_tree_add_item(tree, hf_msmms_data_packet_to_resend, tvb, offset, 4, TRUE);
offset += 4;
if (check_col(pinfo->cinfo, COL_INFO))
{
col_append_fstr(pinfo->cinfo, COL_INFO, " %u", packet_number);
}
}
}
/****************************************************************************/
/* Main dissection function */
/****************************************************************************/
static void dissect_msmms_data(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
gint offset = 0;
proto_item *ti = NULL;
proto_tree *msmms_tree = NULL;
guint32 sequence_number;
guint16 packet_length;
if (check_col(pinfo->cinfo, COL_PROTOCOL))
{
col_set_str(pinfo->cinfo, COL_PROTOCOL, "MSMMS-d");
}
/* Create MSMMS data protocol tree */
if (tree)
{
ti = proto_tree_add_item(tree, proto_msmms_data, tvb, offset, -1, FALSE);
msmms_tree = proto_item_add_subtree(ti, ett_msmms_data);
}
/* May be the command asking for packets to be resent */
if ((pinfo->ptype == PT_UDP) && (pinfo->destport == MSMMS_UDP_COMMAND_PORT))
{
dissect_msmms_data_udp_command(tvb, pinfo, msmms_tree);
return;
}
/* Sequence number */
sequence_number = tvb_get_letohl(tvb, offset);
proto_tree_add_item(msmms_tree, hf_msmms_data_sequence_number, tvb, offset, 4, TRUE);
offset += 4;
/* Packet ID type */
proto_tree_add_item(msmms_tree, hf_msmms_data_packet_id_type, tvb, offset, 1, TRUE);
offset++;
/* TODO: flags depending upon whether UDP or TCP */
offset++;
/* Packet Length */
packet_length = tvb_get_letohs(tvb, offset);
proto_tree_add_item(msmms_tree, hf_msmms_data_packet_length, tvb, offset, 2, TRUE);
offset += 2;
/* Show summary in info column */
if (check_col(pinfo->cinfo, COL_INFO))
{
col_add_fstr(pinfo->cinfo, COL_INFO, "Data: s=%05u, l=%05u",
sequence_number, packet_length);
}
}
/* Set up an MSMMS-d conversation */
void msmms_data_add_address(packet_info *pinfo, address *addr, port_type pt, int port)
{
address null_addr;
conversation_t* p_conv;
/* If this isn't the first time this packet has been processed,
* we've already done this work, so we don't need to do it
* again. */
if (pinfo->fd->flags.visited)
{
return;
}
SET_ADDRESS(&null_addr, AT_NONE, 0, NULL);
/* Check if the ip address and port combination is not
* already registered as a conversation. */
p_conv = find_conversation(pinfo->fd->num, addr, &null_addr, pt, port, 0,
NO_ADDR_B | NO_PORT_B);
/* If not, create a new conversation. */
if (!p_conv)
{
p_conv = conversation_new(pinfo->fd->num, addr, &null_addr, pt,
(guint32)port, 0, NO_ADDR2 | NO_PORT2);
}
/* Set dissector */
conversation_set_dissector(p_conv, msmms_data_handle);
}
/**************************/
/* Register protocol */
void proto_register_msmms_data(void)
{
static hf_register_info hf[] =
{
{
&hf_msmms_data_sequence_number,
{
"Sequence number",
"msmms.data.sequence",
FT_UINT32,
BASE_DEC,
NULL,
0x0,
"", HFILL
}
},
{
&hf_msmms_data_packet_id_type,
{
"Packet ID type",
"msmms.data.packet-id-type",
FT_UINT8,
BASE_HEX,
NULL,
0x0,
"", HFILL
}
},
{
&hf_msmms_data_packet_length,
{
"Packet length",
"msmms.data.packet-length",
FT_UINT16,
BASE_DEC,
NULL,
0x0,
"", HFILL
}
},
{
&hf_msmms_data_header_id,
{
"Header ID",
"msmms.data.header-id",
FT_UINT32,
BASE_HEX,
NULL,
0x0,
"", HFILL
}
},
{
&hf_msmms_data_client_id,
{
"Client ID",
"msmms.data.client-id",
FT_UINT32,
BASE_HEX,
NULL,
0x0,
"", HFILL
}
},
{
&hf_msmms_data_command_id,
{
"Command ID",
"msmms.data.command-id",
FT_UINT16,
BASE_DEC,
NULL,
0x0,
"", HFILL
}
},
{
&hf_msmms_data_packet_to_resend,
{
"Packet to resend",
"msmms.data.packet-to-resend",
FT_UINT32,
BASE_DEC,
NULL,
0x0,
"", HFILL
}
},
};
static gint *ett[] =
{
&ett_msmms_data
};
/* Register protocol and fields */
proto_msmms_data = proto_register_protocol("Microsoft Media Server Data",
"MSMMS-d", "msmms-d");
proto_register_field_array(proto_msmms_data, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
register_dissector("msmms-d", dissect_msmms_data, proto_msmms_data);
}
void proto_reg_handoff_msmms_data(void)
{
msmms_data_handle = find_dissector("msmms-d");
dissector_add_handle("udp.port", msmms_data_handle);
dissector_add_handle("tcp.port", msmms_data_handle);
dissector_add("udp.port", MSMMS_UDP_COMMAND_PORT, msmms_data_handle);
}
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