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/* packet-paltalk.c
* Routines for Paltalk dissection
* Copyright 2005, Tim Hentenaar < tim at hentenaar dot com >
* Copyright 2008, Mohammad Ebrahim Mohammadi Panah < mebrahim at gmail dot com >
*
* $Id$
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <gmodule.h>
#include <epan/packet.h>
#include "packet-tcp.h"
#define PALTALK_SERVERS_ADDRESS 0x00006ac7U /* 199.106.0.0 */
#define PALTALK_SERVERS_NETMASK 0x0000feffU /* /15 */
#define PALTALK_HEADER_LENGTH 6
/* forward reference */
static guint dissect_paltalk_get_len(packet_info *pinfo _U_, tvbuff_t *tvb, int offset);
static void dissect_paltalk_desegmented(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
static int proto_paltalk = -1;
static int hf_paltalk_pdu_type = -1;
static int hf_paltalk_version = -1;
static int hf_paltalk_length = -1;
static int hf_paltalk_content = -1;
static gint ett_paltalk = -1;
static gboolean
dissect_paltalk(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
/* Detect if this TCP session is a Paltalk one */
/* TODO: Optimize detection logic if possible */
if (pinfo->net_src.type != AT_IPv4 || pinfo->net_dst.type != AT_IPv4
|| pinfo->net_src.len != 4 || pinfo->net_dst.len != 4
|| !pinfo->net_src.data || !pinfo->net_dst.data
|| (((*(guint32*) pinfo->net_src.data) & PALTALK_SERVERS_NETMASK) != PALTALK_SERVERS_ADDRESS
&& ((*(guint32*) pinfo->net_dst.data) & PALTALK_SERVERS_NETMASK) != PALTALK_SERVERS_ADDRESS))
return FALSE;
/* Dissect result of desegmented TCP data */
tcp_dissect_pdus(tvb, pinfo, tree, TRUE, PALTALK_HEADER_LENGTH
, dissect_paltalk_get_len, dissect_paltalk_desegmented);
return TRUE;
}
static guint
dissect_paltalk_get_len(packet_info *pinfo _U_, tvbuff_t *tvb, int offset)
{
return tvb_get_ntohs(tvb, offset + 4) + PALTALK_HEADER_LENGTH;
}
static void
dissect_paltalk_desegmented(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
proto_item *ti = NULL;
proto_tree *pt_tree = NULL;
if (check_col(pinfo->cinfo, COL_PROTOCOL))
col_set_str(pinfo->cinfo, COL_PROTOCOL, "Paltalk");
if (check_col(pinfo->cinfo, COL_INFO))
col_clear(pinfo->cinfo, COL_INFO);
if (tree) /* we are being asked for details */
{
ti = proto_tree_add_item(tree, proto_paltalk, tvb, 0, -1, FALSE);
pt_tree = proto_item_add_subtree(ti, ett_paltalk);
proto_tree_add_item(pt_tree, hf_paltalk_pdu_type, tvb, 0, 2, FALSE);
proto_tree_add_item(pt_tree, hf_paltalk_version, tvb, 2, 2, FALSE);
proto_tree_add_item(pt_tree, hf_paltalk_length, tvb, 4, 2, FALSE);
proto_tree_add_item(pt_tree, hf_paltalk_content, tvb, 6, tvb_get_ntohs(tvb, 4), FALSE);
}
}
void
proto_register_paltalk(void)
{
static hf_register_info hf[] = {
{ &hf_paltalk_pdu_type, { "Packet Type", "paltalk.type",
FT_UINT16, BASE_HEX, NULL, 0x00, NULL, HFILL }},
{ &hf_paltalk_version, { "Protocol Version", "paltalk.version",
FT_INT16, BASE_DEC, NULL, 0x00, NULL, HFILL }},
{ &hf_paltalk_length, { "Payload Length", "paltalk.length",
FT_INT16, BASE_DEC, NULL, 0x00, NULL, HFILL }},
{ &hf_paltalk_content, { "Payload Content", "paltalk.content",
FT_BYTES, BASE_NONE, NULL, 0x00, NULL, HFILL }}
};
static gint *ett[] = { &ett_paltalk };
proto_paltalk = proto_register_protocol("Paltalk Messenger Protocol", "Paltalk", "paltalk");
proto_register_field_array(proto_paltalk, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
void
proto_reg_handoff_paltalk(void)
{
heur_dissector_add("tcp", dissect_paltalk, proto_paltalk);
}
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