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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 >
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include <epan/packet.h>
#include "packet-tcp.h"
void proto_register_paltalk(void);
void proto_reg_handoff_paltalk(void);
#define INET_IPV4_ADDRESS_FROM_BYTES(a,b,c,d) g_htonl((((uint32_t)a)<<24) | ((b)<<16) | ((c)<<8) | (d)) /* *network* order */
#define PALTALK_SERVERS_ADDRESS INET_IPV4_ADDRESS_FROM_BYTES(199,106,0,0) /* 199.106.0.0 in *network* order */
#define PALTALK_SERVERS_NETMASK INET_IPV4_ADDRESS_FROM_BYTES(0xFF, 0xFE, 0x00, 0x00) /* /15 in *network* order */
#define PALTALK_HEADER_LENGTH 6
static int proto_paltalk;
static int hf_paltalk_pdu_type;
static int hf_paltalk_version;
static int hf_paltalk_length;
static int hf_paltalk_content;
static int ett_paltalk;
static unsigned
dissect_paltalk_get_len(packet_info *pinfo _U_, tvbuff_t *tvb,
int offset, void *data _U_)
{
return tvb_get_ntohs(tvb, offset + 4) + PALTALK_HEADER_LENGTH;
}
static int
dissect_paltalk_desegmented(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
proto_item *ti = NULL;
proto_tree *pt_tree = NULL;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "Paltalk");
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, ENC_NA);
pt_tree = proto_item_add_subtree(ti, ett_paltalk);
proto_tree_add_item(pt_tree, hf_paltalk_pdu_type, tvb, 0, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(pt_tree, hf_paltalk_version, tvb, 2, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(pt_tree, hf_paltalk_length, tvb, 4, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(pt_tree, hf_paltalk_content, tvb, 6, tvb_get_ntohs(tvb, 4), ENC_NA);
}
return tvb_captured_length(tvb);
}
static bool
dissect_paltalk(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data)
{
uint32_t src32, dst32;
/* 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)
return false;
memcpy((uint8_t *)&src32, pinfo->net_src.data, 4); /* *Network* order */
memcpy((uint8_t *)&dst32, pinfo->net_dst.data, 4); /* *Network* order */
if ( ((src32 & PALTALK_SERVERS_NETMASK) != PALTALK_SERVERS_ADDRESS)
&&
((dst32 & 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, data);
return true;
}
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 int *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, "Paltalk over TCP", "paltalk_tcp", proto_paltalk, HEURISTIC_ENABLE);
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* vi: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
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