2007-02-14 13:22:55 +00:00
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/*
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* Routines for the disassembly of the proprietary Cisco IPSEC in
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* TCP encapsulation protocol
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*
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* Copyright 2007 Joerg Mayer (see AUTHORS file)
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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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2012-06-28 22:56:06 +00:00
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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2007-02-14 13:22:55 +00:00
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*/
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/* TODO:
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* - Find out the meaning of the (unknown) trailer
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* - UDP checksum is wrong
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* - Currently doesn't handle AH (lack of sample trace)
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*/
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2012-09-20 02:03:38 +00:00
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#include "config.h"
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2007-02-14 13:22:55 +00:00
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#include <glib.h>
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#include <epan/packet.h>
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#include <epan/prefs.h>
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2007-09-28 07:34:42 +00:00
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#include "packet-ndmp.h"
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2007-02-14 13:22:55 +00:00
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2013-12-15 23:44:12 +00:00
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void proto_register_tcpencap(void);
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void proto_reg_handoff_tcpencap(void);
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2007-02-14 13:22:55 +00:00
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static int hf_tcpencap_unknown = -1;
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2007-02-15 08:40:18 +00:00
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static int hf_tcpencap_zero = -1;
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static int hf_tcpencap_seq = -1;
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static int hf_tcpencap_ike_direction = -1;
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static int hf_tcpencap_esp_zero = -1;
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static int hf_tcpencap_magic = -1;
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static int hf_tcpencap_proto = -1;
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static int hf_tcpencap_magic2 = -1;
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2007-02-14 13:22:55 +00:00
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static int proto_tcpencap = -1;
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static gint ett_tcpencap = -1;
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2007-02-15 08:40:18 +00:00
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static gint ett_tcpencap_unknown = -1;
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static const value_string tcpencap_ikedir_vals[] = {
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{ 0x0000, "Server to client" },
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{ 0x4000, "Client to server" },
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{ 0, NULL }
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};
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static const value_string tcpencap_proto_vals[] = {
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{ 0x11, "ISAKMP" },
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{ 0x32, "ESP" },
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{ 0, NULL }
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};
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2007-02-14 13:22:55 +00:00
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2010-07-05 23:21:58 +00:00
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#define TRAILERLENGTH 16
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2007-02-14 13:22:55 +00:00
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#define TCP_CISCO_IPSEC 10000
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2013-08-07 04:39:32 +00:00
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/* Another case of several companies creating protocols and
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choosing an easy-to-remember port. Playing tonight: Cisco vs NDMP.
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Since NDMP has officially registered port 10000 with IANA, it should be the default
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*/
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static guint global_tcpencap_tcp_port = 0;
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2007-02-14 13:22:55 +00:00
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static dissector_handle_t esp_handle;
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static dissector_handle_t udp_handle;
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2007-02-15 08:40:18 +00:00
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#define TCP_ENCAP_P_ESP 1
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#define TCP_ENCAP_P_UDP 2
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2007-09-28 07:34:42 +00:00
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static int
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2010-07-05 23:21:58 +00:00
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packet_is_tcpencap(tvbuff_t *tvb, packet_info *pinfo, guint32 offset)
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2007-09-28 07:34:42 +00:00
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{
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2010-07-05 23:21:58 +00:00
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if ( /* Must be zero */
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tvb_get_ntohl(tvb, offset + 0) != 0 ||
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/* Lower 12 bits must be zero */
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(tvb_get_ntohs(tvb, offset + 6) & 0xfff) != 0 ||
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/* Protocol must be UDP or ESP */
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(tvb_get_guint8(tvb, offset + 13) != 17 &&
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tvb_get_guint8(tvb, offset + 13) != 50)
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) {
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return FALSE;
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}
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2007-09-28 07:34:42 +00:00
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if(check_if_ndmp(tvb, pinfo)){
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return FALSE;
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}
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return TRUE;
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}
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2007-02-14 13:22:55 +00:00
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/*
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2011-10-21 02:10:19 +00:00
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* TCP Encapsulation of IPsec Packets
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2007-02-14 13:22:55 +00:00
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* as supported by the cisco vpn3000 concentrator series
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*/
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2007-09-28 07:34:42 +00:00
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static int
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2012-09-10 21:40:21 +00:00
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dissect_tcpencap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
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2007-02-14 13:22:55 +00:00
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{
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proto_tree *tcpencap_tree = NULL;
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2007-02-15 08:40:18 +00:00
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proto_tree *tcpencap_unknown_tree = NULL;
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proto_item *tree_item = NULL;
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proto_item *unknown_item = NULL;
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2007-02-14 13:22:55 +00:00
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tvbuff_t *next_tvb;
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guint32 reported_length = tvb_reported_length(tvb);
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2007-02-15 08:40:18 +00:00
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guint32 offset;
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guint8 protocol;
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2007-02-14 13:22:55 +00:00
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2009-08-09 06:26:46 +00:00
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "TCPENCAP");
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2009-08-09 07:36:13 +00:00
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col_clear(pinfo->cinfo, COL_INFO);
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2007-02-14 13:22:55 +00:00
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/* If the first 4 bytes are 0x01f401f4 (udp src and dst port = 500)
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we most likely have UDP (isakmp) traffic */
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2011-10-21 02:10:19 +00:00
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2007-02-15 08:40:18 +00:00
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if (tvb_get_ntohl(tvb, 0) == 0x01f401f4) { /* UDP means ISAKMP */
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protocol = TCP_ENCAP_P_UDP;
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} else { /* Hopefully ESP */
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protocol = TCP_ENCAP_P_ESP;
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}
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if (tree) {
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2011-10-21 02:10:19 +00:00
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tree_item = proto_tree_add_item(tree, proto_tcpencap, tvb, 0, -1, ENC_NA);
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2007-02-15 08:40:18 +00:00
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tcpencap_tree = proto_item_add_subtree(tree_item, ett_tcpencap);
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/* Dissect the trailer following the encapsulated IPSEC/ISAKMP packet */
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2010-07-05 23:21:58 +00:00
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offset = reported_length - TRAILERLENGTH;
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2007-02-15 08:40:18 +00:00
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unknown_item = proto_tree_add_item(tcpencap_tree, hf_tcpencap_unknown, tvb,
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2011-10-04 22:44:31 +00:00
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offset, TRAILERLENGTH, ENC_NA);
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2007-02-15 08:40:18 +00:00
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/* Try to guess the contents of the trailer */
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tcpencap_unknown_tree = proto_item_add_subtree(unknown_item, ett_tcpencap_unknown);
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2011-10-04 22:44:31 +00:00
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proto_tree_add_item(tcpencap_unknown_tree, hf_tcpencap_zero, tvb, offset + 0, 4, ENC_NA);
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2011-08-26 17:02:33 +00:00
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proto_tree_add_item(tcpencap_unknown_tree, hf_tcpencap_seq, tvb, offset + 4, 2, ENC_BIG_ENDIAN);
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2007-02-15 08:40:18 +00:00
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if (protocol == TCP_ENCAP_P_UDP) {
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2011-08-26 17:02:33 +00:00
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proto_tree_add_item(tcpencap_unknown_tree, hf_tcpencap_ike_direction, tvb, offset + 6, 2, ENC_BIG_ENDIAN);
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2007-02-15 08:40:18 +00:00
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} else {
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2011-08-26 17:02:33 +00:00
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proto_tree_add_item(tcpencap_unknown_tree, hf_tcpencap_esp_zero, tvb, offset + 6, 2, ENC_BIG_ENDIAN);
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2007-02-15 08:40:18 +00:00
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}
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2011-10-04 22:44:31 +00:00
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proto_tree_add_item(tcpencap_unknown_tree, hf_tcpencap_magic, tvb, offset + 8, 5, ENC_NA);
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2011-08-26 17:02:33 +00:00
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proto_tree_add_item(tcpencap_unknown_tree, hf_tcpencap_proto, tvb, offset + 13, 1, ENC_BIG_ENDIAN);
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2011-10-04 22:44:31 +00:00
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proto_tree_add_item(tcpencap_unknown_tree, hf_tcpencap_magic2, tvb, offset + 14, 2, ENC_NA);
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2007-02-15 08:40:18 +00:00
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}
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2007-02-14 13:22:55 +00:00
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/* Create the tvbuffer for the next dissector */
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2010-07-05 23:21:58 +00:00
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next_tvb = tvb_new_subset(tvb, 0, reported_length - TRAILERLENGTH , -1);
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2007-02-15 08:40:18 +00:00
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if (protocol == TCP_ENCAP_P_UDP) {
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2007-02-14 13:22:55 +00:00
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call_dissector(udp_handle, next_tvb, pinfo, tree);
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} else { /* Hopefully ESP */
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call_dissector(esp_handle, next_tvb, pinfo, tree);
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}
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2007-02-15 08:40:18 +00:00
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2014-06-19 17:18:16 +00:00
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return tvb_length(tvb);
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2007-02-14 13:22:55 +00:00
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}
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2013-08-07 04:39:32 +00:00
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static gboolean
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dissect_tcpencap_heur(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data)
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{
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guint32 reported_length = tvb_reported_length(tvb);
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2014-06-19 17:18:16 +00:00
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guint32 length = tvb_length(tvb);
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2013-08-07 04:39:32 +00:00
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if (reported_length <= TRAILERLENGTH + 8 ||
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2013-11-09 21:30:33 +00:00
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/* Ensure we have enough bytes for packet_is_tcpencap analysis */
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(reported_length - length) > (TRAILERLENGTH - 13) ||
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2013-08-07 04:39:32 +00:00
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!packet_is_tcpencap(tvb, pinfo, reported_length - TRAILERLENGTH) ) {
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return FALSE;
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}
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dissect_tcpencap(tvb, pinfo, tree, data);
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return TRUE;
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}
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2007-02-14 13:22:55 +00:00
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void
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proto_register_tcpencap(void)
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{
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static hf_register_info hf[] = {
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{ &hf_tcpencap_unknown,
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2007-02-15 08:40:18 +00:00
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{ "Unknown trailer", "tcpencap.unknown", FT_BYTES, BASE_NONE, NULL,
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From Kovarththanan Rajaratnam via bug 3548:
(1) Trailing/leading spaces are removed from 'name's/'blurb's
(2) Duplicate 'blurb's are replaced with NULL
(3) Empty ("") 'blurb's are replaced with NULL
(4) BASE_NONE, NULL, 0x0 are used for 'display', 'strings' and 'bitmask' fields
for FT_NONE, FT_BYTES, FT_IPv4, FT_IPv6, FT_ABSOLUTE_TIME, FT_RELATIVE_TIME,
FT_PROTOCOL, FT_STRING and FT_STRINGZ field types
(5) Only allow non-zero value for 'display' if 'bitmask' is non-zero
svn path=/trunk/; revision=28770
2009-06-18 21:30:42 +00:00
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0x0, NULL, HFILL }},
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2007-02-15 08:40:18 +00:00
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{ &hf_tcpencap_zero,
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{ "All zero", "tcpencap.zero", FT_BYTES, BASE_NONE, NULL,
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From Kovarththanan Rajaratnam via bug 3548:
(1) Trailing/leading spaces are removed from 'name's/'blurb's
(2) Duplicate 'blurb's are replaced with NULL
(3) Empty ("") 'blurb's are replaced with NULL
(4) BASE_NONE, NULL, 0x0 are used for 'display', 'strings' and 'bitmask' fields
for FT_NONE, FT_BYTES, FT_IPv4, FT_IPv6, FT_ABSOLUTE_TIME, FT_RELATIVE_TIME,
FT_PROTOCOL, FT_STRING and FT_STRINGZ field types
(5) Only allow non-zero value for 'display' if 'bitmask' is non-zero
svn path=/trunk/; revision=28770
2009-06-18 21:30:42 +00:00
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0x0, NULL, HFILL }},
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2007-02-15 08:40:18 +00:00
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{ &hf_tcpencap_seq,
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{ "Sequence number", "tcpencap.seq", FT_UINT16, BASE_HEX, NULL,
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From Kovarththanan Rajaratnam via bug 3548:
(1) Trailing/leading spaces are removed from 'name's/'blurb's
(2) Duplicate 'blurb's are replaced with NULL
(3) Empty ("") 'blurb's are replaced with NULL
(4) BASE_NONE, NULL, 0x0 are used for 'display', 'strings' and 'bitmask' fields
for FT_NONE, FT_BYTES, FT_IPv4, FT_IPv6, FT_ABSOLUTE_TIME, FT_RELATIVE_TIME,
FT_PROTOCOL, FT_STRING and FT_STRINGZ field types
(5) Only allow non-zero value for 'display' if 'bitmask' is non-zero
svn path=/trunk/; revision=28770
2009-06-18 21:30:42 +00:00
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0x0, NULL, HFILL }},
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2007-02-15 08:40:18 +00:00
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{ &hf_tcpencap_esp_zero,
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{ "ESP zero", "tcpencap.espzero", FT_UINT16, BASE_HEX, NULL,
|
From Kovarththanan Rajaratnam via bug 3548:
(1) Trailing/leading spaces are removed from 'name's/'blurb's
(2) Duplicate 'blurb's are replaced with NULL
(3) Empty ("") 'blurb's are replaced with NULL
(4) BASE_NONE, NULL, 0x0 are used for 'display', 'strings' and 'bitmask' fields
for FT_NONE, FT_BYTES, FT_IPv4, FT_IPv6, FT_ABSOLUTE_TIME, FT_RELATIVE_TIME,
FT_PROTOCOL, FT_STRING and FT_STRINGZ field types
(5) Only allow non-zero value for 'display' if 'bitmask' is non-zero
svn path=/trunk/; revision=28770
2009-06-18 21:30:42 +00:00
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0x0, NULL, HFILL }},
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2007-02-15 08:40:18 +00:00
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{ &hf_tcpencap_ike_direction,
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{ "ISAKMP traffic direction", "tcpencap.ikedirection", FT_UINT16, BASE_HEX, VALS(tcpencap_ikedir_vals),
|
From Kovarththanan Rajaratnam via bug 3548:
(1) Trailing/leading spaces are removed from 'name's/'blurb's
(2) Duplicate 'blurb's are replaced with NULL
(3) Empty ("") 'blurb's are replaced with NULL
(4) BASE_NONE, NULL, 0x0 are used for 'display', 'strings' and 'bitmask' fields
for FT_NONE, FT_BYTES, FT_IPv4, FT_IPv6, FT_ABSOLUTE_TIME, FT_RELATIVE_TIME,
FT_PROTOCOL, FT_STRING and FT_STRINGZ field types
(5) Only allow non-zero value for 'display' if 'bitmask' is non-zero
svn path=/trunk/; revision=28770
2009-06-18 21:30:42 +00:00
|
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0x0, NULL, HFILL }},
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2007-02-15 08:40:18 +00:00
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{ &hf_tcpencap_magic,
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{ "Magic number", "tcpencap.magic", FT_BYTES, BASE_NONE, NULL,
|
From Kovarththanan Rajaratnam via bug 3548:
(1) Trailing/leading spaces are removed from 'name's/'blurb's
(2) Duplicate 'blurb's are replaced with NULL
(3) Empty ("") 'blurb's are replaced with NULL
(4) BASE_NONE, NULL, 0x0 are used for 'display', 'strings' and 'bitmask' fields
for FT_NONE, FT_BYTES, FT_IPv4, FT_IPv6, FT_ABSOLUTE_TIME, FT_RELATIVE_TIME,
FT_PROTOCOL, FT_STRING and FT_STRINGZ field types
(5) Only allow non-zero value for 'display' if 'bitmask' is non-zero
svn path=/trunk/; revision=28770
2009-06-18 21:30:42 +00:00
|
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|
0x0, NULL, HFILL }},
|
2007-02-15 08:40:18 +00:00
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{ &hf_tcpencap_proto,
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{ "Protocol", "tcpencap.proto", FT_UINT8, BASE_HEX, VALS(tcpencap_proto_vals),
|
From Kovarththanan Rajaratnam via bug 3548:
(1) Trailing/leading spaces are removed from 'name's/'blurb's
(2) Duplicate 'blurb's are replaced with NULL
(3) Empty ("") 'blurb's are replaced with NULL
(4) BASE_NONE, NULL, 0x0 are used for 'display', 'strings' and 'bitmask' fields
for FT_NONE, FT_BYTES, FT_IPv4, FT_IPv6, FT_ABSOLUTE_TIME, FT_RELATIVE_TIME,
FT_PROTOCOL, FT_STRING and FT_STRINGZ field types
(5) Only allow non-zero value for 'display' if 'bitmask' is non-zero
svn path=/trunk/; revision=28770
2009-06-18 21:30:42 +00:00
|
|
|
0x0, NULL, HFILL }},
|
2007-02-15 08:40:18 +00:00
|
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{ &hf_tcpencap_magic2,
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|
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{ "Magic 2", "tcpencap.magic2", FT_BYTES, BASE_NONE, NULL,
|
From Kovarththanan Rajaratnam via bug 3548:
(1) Trailing/leading spaces are removed from 'name's/'blurb's
(2) Duplicate 'blurb's are replaced with NULL
(3) Empty ("") 'blurb's are replaced with NULL
(4) BASE_NONE, NULL, 0x0 are used for 'display', 'strings' and 'bitmask' fields
for FT_NONE, FT_BYTES, FT_IPv4, FT_IPv6, FT_ABSOLUTE_TIME, FT_RELATIVE_TIME,
FT_PROTOCOL, FT_STRING and FT_STRINGZ field types
(5) Only allow non-zero value for 'display' if 'bitmask' is non-zero
svn path=/trunk/; revision=28770
2009-06-18 21:30:42 +00:00
|
|
|
0x0, NULL, HFILL }},
|
2007-02-15 08:40:18 +00:00
|
|
|
|
2007-02-14 13:22:55 +00:00
|
|
|
};
|
|
|
|
|
|
|
|
static gint *ett[] = {
|
|
|
|
&ett_tcpencap,
|
2007-02-15 08:40:18 +00:00
|
|
|
&ett_tcpencap_unknown,
|
2007-02-14 13:22:55 +00:00
|
|
|
};
|
|
|
|
|
|
|
|
module_t *tcpencap_module;
|
|
|
|
|
|
|
|
proto_tcpencap = proto_register_protocol(
|
|
|
|
"TCP Encapsulation of IPsec Packets", "TCPENCAP", "tcpencap");
|
|
|
|
proto_register_field_array(proto_tcpencap, hf, array_length(hf));
|
|
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
|
|
tcpencap_module = prefs_register_protocol(proto_tcpencap, proto_reg_handoff_tcpencap);
|
|
|
|
prefs_register_uint_preference(tcpencap_module, "tcp.port", "IPSEC TCP Port",
|
2013-08-07 04:39:32 +00:00
|
|
|
"Set the port for IPSEC/ISAKMP messages (typically 10000)",
|
2007-02-14 13:22:55 +00:00
|
|
|
10, &global_tcpencap_tcp_port);
|
|
|
|
}
|
|
|
|
|
2009-07-27 14:45:25 +00:00
|
|
|
void
|
|
|
|
proto_reg_handoff_tcpencap(void)
|
|
|
|
{
|
|
|
|
static dissector_handle_t tcpencap_handle;
|
|
|
|
static gboolean initialized = FALSE;
|
2013-08-07 04:39:32 +00:00
|
|
|
static guint tcpencap_tcp_port = 0;
|
2009-07-27 14:45:25 +00:00
|
|
|
|
|
|
|
if (!initialized) {
|
|
|
|
tcpencap_handle = new_create_dissector_handle(dissect_tcpencap, proto_tcpencap);
|
|
|
|
esp_handle = find_dissector("esp");
|
|
|
|
udp_handle = find_dissector("udp");
|
2013-08-07 04:39:32 +00:00
|
|
|
|
|
|
|
heur_dissector_add("tcp", dissect_tcpencap_heur, proto_tcpencap);
|
|
|
|
|
2009-07-27 14:45:25 +00:00
|
|
|
initialized = TRUE;
|
2013-08-07 04:39:32 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/* Register TCP port for dissection */
|
|
|
|
if(tcpencap_tcp_port != 0 && tcpencap_tcp_port != global_tcpencap_tcp_port){
|
2010-12-20 05:35:29 +00:00
|
|
|
dissector_delete_uint("tcp.port", tcpencap_tcp_port, tcpencap_handle);
|
2009-07-27 14:45:25 +00:00
|
|
|
}
|
|
|
|
|
2013-08-07 04:39:32 +00:00
|
|
|
if(global_tcpencap_tcp_port != 0 && tcpencap_tcp_port != global_tcpencap_tcp_port) {
|
|
|
|
dissector_add_uint("tcp.port", global_tcpencap_tcp_port, tcpencap_handle);
|
|
|
|
}
|
2009-07-27 14:45:25 +00:00
|
|
|
}
|
|
|
|
|
2014-09-30 20:59:17 +00:00
|
|
|
/*
|
|
|
|
* Editor modelines - http://www.wireshark.org/tools/modelines.html
|
|
|
|
*
|
|
|
|
* Local variables:
|
|
|
|
* c-basic-offset: 8
|
|
|
|
* tab-width: 8
|
|
|
|
* indent-tabs-mode: t
|
|
|
|
* End:
|
|
|
|
*
|
|
|
|
* vi: set shiftwidth=8 tabstop=8 noexpandtab:
|
|
|
|
* :indentSize=8:tabSize=8:noTabs=false:
|
|
|
|
*/
|