diff options
author | Anders Broman <anders.broman@ericsson.com> | 2008-08-01 15:11:06 +0000 |
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committer | Anders Broman <anders.broman@ericsson.com> | 2008-08-01 15:11:06 +0000 |
commit | 47aca4c30fa911e401c843bd08850e085d25c2cc (patch) | |
tree | 2453307fde84e00a15b73f69a0eec433be535372 /epan/dissectors/packet-turnchannel.c | |
parent | 94d4e2c70a48b90a060be73de11b9b85a5de508e (diff) |
From stéphane bryant:
STUN, STUN2 and TURN dissection enhancements.
svn path=/trunk/; revision=25895
Diffstat (limited to 'epan/dissectors/packet-turnchannel.c')
-rw-r--r-- | epan/dissectors/packet-turnchannel.c | 247 |
1 files changed, 247 insertions, 0 deletions
diff --git a/epan/dissectors/packet-turnchannel.c b/epan/dissectors/packet-turnchannel.c new file mode 100644 index 0000000000..716e77af96 --- /dev/null +++ b/epan/dissectors/packet-turnchannel.c @@ -0,0 +1,247 @@ +/* packet-turnchannel.c + * Routines for TURN channel dissection (TURN negociation is handled + * in the STUN2 dissector + * Copyright 2008, 8x8 Inc. <petithug@8x8.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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * + * Please refer to the following specs for protocol detail: + * - draft-ietf-behave-rfc3489bis-15 + * - draft-ietf-mmusic-ice-19 + * - draft-ietf-behave-nat-behavior-discovery-03 + * - draft-ietf-behave-turn-07 + * - draft-ietf-behave-turn-ipv6-03 + */ + +#ifdef HAVE_CONFIG_H +# include "config.h" +#endif + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +#include <glib.h> + +#include <epan/packet.h> +#include <epan/conversation.h> +#include <packet-tcp.h> + +/* heuristic subdissectors */ +static heur_dissector_list_t heur_subdissector_list; + +/* data dissector handle */ +static dissector_handle_t data_handle; + +/* Initialize the protocol and registered fields */ +static int proto_turnchannel = -1; + +static int hf_turnchannel_id = -1; +static int hf_turnchannel_len = -1; + +/* Structure containing conversation specific information */ +typedef struct _turn2_conv_info_t { + emem_tree_t *pdus; +} turn_conv_info_t; + +/* Structure containing transaction specific information */ +typedef struct _turnchannel_t { + guint16 channelid; +} turnchannel_t; + + +#define TURNCHANNEL_HDR_LEN ((guint)4) + + + +/* Initialize the subtree pointers */ +static gint ett_turnchannel = -1; + +static int +dissect_turnchannel_message(tvbuff_t *tvb, packet_info *pinfo, + proto_tree *tree) +{ + guint len; + guint16 channel_id; + guint16 data_len; + proto_item *ti; + proto_tree *turnchannel_tree; + + len = tvb_length(tvb); + /* First, make sure we have enough data to do the check. */ + if (len < TURNCHANNEL_HDR_LEN) { + return FALSE; + } + + channel_id = tvb_get_ntohs(tvb, 0); + data_len = tvb_get_ntohs(tvb, 2); + + if ((channel_id < 0x4000) || (channel_id > 0xFFFE)) { + return FALSE; + } + + if (len != TURNCHANNEL_HDR_LEN + data_len) { + return FALSE; + } + + /* Seems to be a decent TURN channel message */ + if (check_col(pinfo->cinfo, COL_PROTOCOL)) + col_set_str(pinfo->cinfo, COL_PROTOCOL, "TURN CHANNEL"); + + if (check_col(pinfo->cinfo, COL_INFO)) + col_add_fstr(pinfo->cinfo, COL_INFO, "Channel Id 0x%x", channel_id); + + if (!tree) + return TRUE; + + ti = proto_tree_add_item(tree, proto_turnchannel, tvb, 0, -1, FALSE); + + turnchannel_tree = proto_item_add_subtree(ti, ett_turnchannel); + + proto_tree_add_uint(turnchannel_tree, hf_turnchannel_id, tvb, 0, 2, channel_id); + proto_tree_add_uint(turnchannel_tree, hf_turnchannel_len, tvb, 2, 2, data_len); + + + if (len > TURNCHANNEL_HDR_LEN) { + tvbuff_t *next_tvb; + guint reported_len, new_len; + + new_len = tvb_length_remaining(tvb, TURNCHANNEL_HDR_LEN); + reported_len = tvb_reported_length_remaining(tvb, + TURNCHANNEL_HDR_LEN); + if (data_len < reported_len) { + reported_len = data_len; + } + next_tvb = tvb_new_subset(tvb, TURNCHANNEL_HDR_LEN, new_len, + reported_len); + + + if (!dissector_try_heuristic(heur_subdissector_list, + next_tvb, pinfo, tree)) { + call_dissector(data_handle,next_tvb, pinfo, tree); + } + } + + return TRUE; +} + + +static void +dissect_turnchannel_message_no_return(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) +{ + dissect_turnchannel_message(tvb, pinfo, tree); +} + + +static guint +get_turnchannel_message_len(packet_info *pinfo _U_, tvbuff_t *tvb, int offset) +{ + return (guint)tvb_get_ntohs(tvb, offset+2) + TURNCHANNEL_HDR_LEN; +} + +static void +dissect_turnchannel_tcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) +{ + tcp_dissect_pdus(tvb, pinfo, tree, TRUE, TURNCHANNEL_HDR_LEN, + get_turnchannel_message_len, dissect_turnchannel_message_no_return); +} + + +static gboolean +dissect_turnchannel_heur(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) +{ + guint len; + guint16 channel_id; + guint16 data_len; + + len = tvb_length(tvb); + /* First, make sure we have enough data to do the check. */ + if (len < TURNCHANNEL_HDR_LEN) { + return FALSE; + } + + channel_id = tvb_get_ntohs(tvb, 0); + data_len = tvb_get_ntohs(tvb, 2); + + if ((channel_id < 0x4000) || (channel_id > 0xFFFE)) { + return FALSE; + } + + if (len != TURNCHANNEL_HDR_LEN + data_len) { + return FALSE; + } + + return dissect_turnchannel_message(tvb, pinfo, tree); +} + +void +proto_register_turnchannel(void) +{ + static hf_register_info hf[] = { + { &hf_turnchannel_id, + { "TURN Channel ID", "turnchannel.id", FT_UINT16, + BASE_HEX, NULL, 0x0, "", HFILL } + }, + { &hf_turnchannel_len, + { "Data Length", "turnchannel.length", FT_UINT16, + BASE_DEC, NULL, 0x0, "", HFILL } + }, + }; + +/* Setup protocol subtree array */ + static gint *ett[] = { + &ett_turnchannel, + }; + +/* Register the protocol name and description */ + proto_turnchannel = proto_register_protocol("TURN Channel", + "TURNCHANNEL", "turnchannel"); + + register_dissector("turnchannel", dissect_turnchannel_message, + proto_turnchannel); + +/* subdissectors */ + register_heur_dissector_list("turnchannel", &heur_subdissector_list); + +/* Required function calls to register the header fields and subtrees used */ + proto_register_field_array(proto_turnchannel, hf, array_length(hf)); + proto_register_subtree_array(ett, array_length(ett)); + +} + + +void +proto_reg_handoff_turnchannel(void) +{ + dissector_handle_t turnchannel_tcp_handle; + dissector_handle_t turnchannel_udp_handle; + + turnchannel_tcp_handle = create_dissector_handle(dissect_turnchannel_tcp, proto_turnchannel); + turnchannel_udp_handle = new_create_dissector_handle(dissect_turnchannel_message, proto_turnchannel); + + dissector_add("tcp.port", 0, turnchannel_tcp_handle); + dissector_add("udp.port", 0, turnchannel_udp_handle); + + heur_dissector_add("udp", dissect_turnchannel_heur, proto_turnchannel); + heur_dissector_add("tcp", dissect_turnchannel_heur, proto_turnchannel); + + data_handle = find_dissector("data"); +} |