2009-05-21 00:34:03 +00:00
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/* packet-paltalk.c
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* Routines for Paltalk dissection
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* Copyright 2005, Tim Hentenaar < tim at hentenaar dot com >
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* Copyright 2008, Mohammad Ebrahim Mohammadi Panah < mebrahim at gmail dot com >
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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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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 <gmodule.h>
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#include <epan/packet.h>
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#include "packet-tcp.h"
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#define PALTALK_SERVERS_ADDRESS 0x00006ac7U /* 199.106.0.0 */
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#define PALTALK_SERVERS_NETMASK 0x0000feffU /* /15 */
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#define PALTALK_HEADER_LENGTH 6
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/* forward reference */
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static guint dissect_paltalk_get_len(packet_info *pinfo _U_, tvbuff_t *tvb, int offset);
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static void dissect_paltalk_desegmented(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
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static int proto_paltalk = -1;
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2009-05-21 18:36:32 +00:00
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2009-05-21 00:34:03 +00:00
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static int hf_paltalk_pdu_type = -1;
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static int hf_paltalk_version = -1;
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static int hf_paltalk_length = -1;
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static int hf_paltalk_content = -1;
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2009-05-21 18:36:32 +00:00
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static gint ett_paltalk = -1;
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2009-05-21 00:34:03 +00:00
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static gboolean
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dissect_paltalk(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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/* Detect if this TCP session is a Paltalk one */
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/* TODO: Optimize detection logic if possible */
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if (pinfo->net_src.type != AT_IPv4 || pinfo->net_dst.type != AT_IPv4
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|| pinfo->net_src.len != 4 || pinfo->net_dst.len != 4
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|| !pinfo->net_src.data || !pinfo->net_dst.data
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|| (((*(guint32*) pinfo->net_src.data) & PALTALK_SERVERS_NETMASK) != PALTALK_SERVERS_ADDRESS
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&& ((*(guint32*) pinfo->net_dst.data) & PALTALK_SERVERS_NETMASK) != PALTALK_SERVERS_ADDRESS))
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return FALSE;
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/* Dissect result of desegmented TCP data */
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tcp_dissect_pdus(tvb, pinfo, tree, TRUE, PALTALK_HEADER_LENGTH
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, dissect_paltalk_get_len, dissect_paltalk_desegmented);
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return TRUE;
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}
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static guint
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dissect_paltalk_get_len(packet_info *pinfo _U_, tvbuff_t *tvb, int offset)
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{
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return tvb_get_ntohs(tvb, offset + 4) + PALTALK_HEADER_LENGTH;
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}
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static void
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dissect_paltalk_desegmented(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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proto_item *ti = NULL;
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proto_tree *pt_tree = NULL;
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "Paltalk");
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if (check_col(pinfo->cinfo, COL_INFO))
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col_clear(pinfo->cinfo, COL_INFO);
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if (tree) /* we are being asked for details */
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{
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ti = proto_tree_add_item(tree, proto_paltalk, tvb, 0, -1, FALSE);
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pt_tree = proto_item_add_subtree(ti, ett_paltalk);
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proto_tree_add_item(pt_tree, hf_paltalk_pdu_type, tvb, 0, 2, FALSE);
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proto_tree_add_item(pt_tree, hf_paltalk_version, tvb, 2, 2, FALSE);
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proto_tree_add_item(pt_tree, hf_paltalk_length, tvb, 4, 2, FALSE);
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proto_tree_add_item(pt_tree, hf_paltalk_content, tvb, 6, tvb_get_ntohs(tvb, 4), FALSE);
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}
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}
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2009-05-21 18:36:32 +00:00
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void
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proto_register_paltalk(void)
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{
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static hf_register_info hf[] = {
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{ &hf_paltalk_pdu_type, { "Packet Type", "paltalk.type",
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FT_UINT16, BASE_HEX, NULL, 0x00, NULL, HFILL }},
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{ &hf_paltalk_version, { "Protocol Version", "paltalk.version",
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FT_INT16, BASE_DEC, NULL, 0x00, NULL, HFILL }},
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{ &hf_paltalk_length, { "Payload Length", "paltalk.length",
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FT_INT16, BASE_DEC, NULL, 0x00, NULL, HFILL }},
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{ &hf_paltalk_content, { "Payload Content", "paltalk.content",
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FT_BYTES, BASE_NONE, NULL, 0x00, NULL, HFILL }}
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};
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static gint *ett[] = { &ett_paltalk };
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proto_paltalk = proto_register_protocol("Paltalk Messenger Protocol", "Paltalk", "paltalk");
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proto_register_field_array(proto_paltalk, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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void
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proto_reg_handoff_paltalk(void)
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{
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heur_dissector_add("tcp", dissect_paltalk, proto_paltalk);
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}
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