forked from osmocom/wireshark
![Dario Lombardo](/assets/img/avatar_default.png)
Change-Id: I92c94448e6641716d03158a5f332c8b53709423a Reviewed-on: https://code.wireshark.org/review/25756 Petri-Dish: Dario Lombardo <lomato@gmail.com> Reviewed-by: Anders Broman <a.broman58@gmail.com>
404 lines
17 KiB
C
404 lines
17 KiB
C
/*
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* packet-rtcdc.c
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* Routines for the RTCWeb Data Channel Protocol dissection
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* as specified in
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* http://tools.ietf.org/html/draft-jesup-rtcweb-data-protocol-03
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* and specified in
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* http://tools.ietf.org/html/draft-ietf-rtcweb-data-protocol-08
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* We might want to remove the support of
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* http://tools.ietf.org/html/draft-jesup-rtcweb-data-protocol-03
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* in the future, but I'll leave it in for now.
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* Copyright 2012 - 2013, Michael Tuexen <tuexen@wireshark.org>
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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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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "config.h"
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#include <epan/packet.h>
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#include <epan/expert.h>
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#include <epan/prefs.h>
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#include <epan/sctpppids.h>
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void proto_register_rtcdc(void);
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void proto_reg_handoff_rtcdc(void);
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/* PPID used for this protocol */
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static guint32 rtcdc_ppid = WEBRTC_DCEP_PROTOCOL_ID;
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/* Initialize the protocol and registered fields */
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static int proto_rtcdc = -1;
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static int hf_message_type = -1;
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static int hf_channel_type = -1;
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static int hf_flags = -1;
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static int hf_flags_reserved = -1;
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static int hf_unordered_allowed = -1;
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static int hf_reliability = -1;
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static int hf_priority = -1;
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static int hf_label = -1;
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static int hf_error = -1;
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static int hf_sid = -1;
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static int hf_new_channel_type = -1;
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static int hf_new_reliability = -1;
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static int hf_new_priority = -1;
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static int hf_new_label_length = -1;
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static int hf_new_protocol_length = -1;
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static int hf_new_label = -1;
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static int hf_new_protocol = -1;
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/* Initialize the subtree pointers */
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static gint ett_rtcdc = -1;
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static gint ett_flags = -1;
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static expert_field ei_rtcdc_new_reliability_non_zero = EI_INIT;
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static expert_field ei_rtcdc_message_type_unknown = EI_INIT;
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static expert_field ei_rtcdc_inconsistent_label_and_parameter_length = EI_INIT;
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static expert_field ei_rtcdc_message_too_long = EI_INIT;
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static expert_field ei_rtcdc_new_channel_type = EI_INIT;
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#define DATA_CHANNEL_OPEN_REQUEST 0x00
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#define DATA_CHANNEL_OPEN_RESPONSE 0x01
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#define DATA_CHANNEL_ACK 0x02
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#define DATA_CHANNEL_NEW_OPEN_REQUEST 0x03
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static const value_string message_type_values[] = {
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{ DATA_CHANNEL_OPEN_REQUEST, "DATA_CHANNEL_OPEN_REQUEST" },
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{ DATA_CHANNEL_OPEN_RESPONSE, "DATA_CHANNEL_OPEN_RESPONSE" },
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{ DATA_CHANNEL_ACK, "DATA_CHANNEL_ACK" },
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{ DATA_CHANNEL_NEW_OPEN_REQUEST, "DATA_CHANNEL_OPEN_REQUEST" },
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{ 0, NULL }
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};
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#define DATA_CHANNEL_RELIABLE 0x00
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#define DATA_CHANNEL_PARTIAL_RELIABLE_REXMIT 0x01
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#define DATA_CHANNEL_PARTIAL_RELIABLE_TIMED 0x02
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static const value_string channel_type_values[] = {
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{ DATA_CHANNEL_RELIABLE, "DATA_CHANNEL_RELIABLE" },
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{ DATA_CHANNEL_PARTIAL_RELIABLE_REXMIT, "DATA_CHANNEL_PARTIAL_RELIABLE_REXMIT" },
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{ DATA_CHANNEL_PARTIAL_RELIABLE_TIMED, "DATA_CHANNEL_PARTIAL_RELIABLE_TIMED" },
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{ 0, NULL }
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};
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#define MESSAGE_TYPE_LENGTH 1
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#define CHANNEL_TYPE_LENGTH 1
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#define FLAGS_LENGTH 2
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#define RELIABILITY_LENGTH 2
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#define PRIORITY_LENGTH 2
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#define MESSAGE_TYPE_OFFSET 0
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#define CHANNEL_TYPE_OFFSET (MESSAGE_TYPE_OFFSET + MESSAGE_TYPE_LENGTH)
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#define FLAGS_OFFSET (CHANNEL_TYPE_OFFSET + CHANNEL_TYPE_LENGTH)
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#define RELIABILITY_OFFSET (FLAGS_OFFSET + FLAGS_LENGTH)
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#define PRIORITY_OFFSET (RELIABILITY_OFFSET + RELIABILITY_LENGTH)
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#define LABEL_OFFSET (PRIORITY_OFFSET + PRIORITY_LENGTH)
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#define DATA_CHANNEL_FLAG_OUT_OF_ORDER_ALLOWED_MASK 0x0001
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#define DATA_CHANNEL_FLAG_RESERVED_MASK 0xFFFE
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static void
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dissect_open_request_message(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *rtcdc_tree, proto_item *rtcdc_item _U_)
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{
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if (rtcdc_tree) {
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proto_tree *flags_tree;
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proto_item *flags_item;
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proto_tree_add_item(rtcdc_tree, hf_channel_type, tvb, CHANNEL_TYPE_OFFSET, CHANNEL_TYPE_LENGTH, ENC_BIG_ENDIAN);
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flags_item = proto_tree_add_item(rtcdc_tree, hf_flags, tvb, FLAGS_OFFSET, FLAGS_LENGTH, ENC_BIG_ENDIAN);
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flags_tree = proto_item_add_subtree(flags_item, ett_flags);
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proto_tree_add_item(flags_tree, hf_flags_reserved, tvb, FLAGS_OFFSET, FLAGS_LENGTH, ENC_BIG_ENDIAN);
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proto_tree_add_item(flags_tree, hf_unordered_allowed, tvb, FLAGS_OFFSET, FLAGS_LENGTH, ENC_BIG_ENDIAN);
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proto_tree_add_item(rtcdc_tree, hf_reliability, tvb, RELIABILITY_OFFSET, RELIABILITY_LENGTH, ENC_BIG_ENDIAN);
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proto_tree_add_item(rtcdc_tree, hf_priority, tvb, PRIORITY_OFFSET, PRIORITY_LENGTH, ENC_BIG_ENDIAN);
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proto_tree_add_item(rtcdc_tree, hf_label, tvb, LABEL_OFFSET, -1, ENC_ASCII|ENC_NA);
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}
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return;
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}
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#define ERROR_LENGTH 1
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#define SID_LENGTH 2
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#define DATA_CHANNEL_RESPONSE_LENGTH (MESSAGE_TYPE_LENGTH + ERROR_LENGTH + FLAGS_LENGTH + SID_LENGTH)
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#define ERROR_OFFSET (MESSAGE_TYPE_OFFSET + MESSAGE_TYPE_LENGTH)
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#define SID_OFFSET (FLAGS_OFFSET + FLAGS_LENGTH)
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static void
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dissect_open_response_message(tvbuff_t *tvb, packet_info *pinfo, proto_tree *rtcdc_tree, proto_item *rtcdc_item)
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{
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if (tvb_reported_length(tvb) > DATA_CHANNEL_RESPONSE_LENGTH) {
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expert_add_info(pinfo, rtcdc_item, &ei_rtcdc_message_too_long);
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}
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if (rtcdc_tree) {
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proto_tree_add_item(rtcdc_tree, hf_error, tvb, ERROR_OFFSET, ERROR_LENGTH, ENC_BIG_ENDIAN);
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proto_tree_add_item(rtcdc_tree, hf_flags, tvb, FLAGS_OFFSET, FLAGS_LENGTH, ENC_BIG_ENDIAN);
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proto_tree_add_item(rtcdc_tree, hf_sid, tvb, SID_OFFSET, SID_LENGTH, ENC_BIG_ENDIAN);
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}
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return;
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}
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#define DATA_CHANNEL_ACK_LENGTH MESSAGE_TYPE_LENGTH
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static void
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dissect_open_ack_message(tvbuff_t *tvb, packet_info *pinfo, proto_tree *rtcdc_tree _U_, proto_item *rtcdc_item)
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{
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if (tvb_reported_length(tvb) > DATA_CHANNEL_ACK_LENGTH) {
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expert_add_info(pinfo, rtcdc_item, &ei_rtcdc_message_too_long);
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}
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return;
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}
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#define NEW_DATA_CHANNEL_RELIABLE 0x00
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#define NEW_DATA_CHANNEL_PARTIAL_RELIABLE_REXMIT 0x01
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#define NEW_DATA_CHANNEL_PARTIAL_RELIABLE_TIMED 0x02
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#define NEW_DATA_CHANNEL_RELIABLE_UNORDERED 0x80
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#define NEW_DATA_CHANNEL_PARTIAL_RELIABLE_REXMIT_UNORDERED 0x81
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#define NEW_DATA_CHANNEL_PARTIAL_RELIABLE_TIMED_UNORDERED 0x82
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static const value_string new_channel_type_values[] = {
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{ NEW_DATA_CHANNEL_RELIABLE, "DATA_CHANNEL_RELIABLE" },
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{ NEW_DATA_CHANNEL_PARTIAL_RELIABLE_REXMIT, "DATA_CHANNEL_PARTIAL_RELIABLE_REXMIT" },
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{ NEW_DATA_CHANNEL_PARTIAL_RELIABLE_TIMED, "DATA_CHANNEL_PARTIAL_RELIABLE_TIMED" },
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{ NEW_DATA_CHANNEL_RELIABLE_UNORDERED, "DATA_CHANNEL_RELIABLE_UNORDERED" },
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{ NEW_DATA_CHANNEL_PARTIAL_RELIABLE_REXMIT_UNORDERED, "DATA_CHANNEL_PARTIAL_RELIABLE_REXMIT_UNORDERED" },
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{ NEW_DATA_CHANNEL_PARTIAL_RELIABLE_TIMED_UNORDERED, "DATA_CHANNEL_PARTIAL_RELIABLE_TIMED_UNORDERED" },
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{ 0, NULL }
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};
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#define NEW_MESSAGE_TYPE_LENGTH 1
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#define NEW_CHANNEL_TYPE_LENGTH 1
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#define NEW_PRIORITY_LENGTH 2
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#define NEW_RELIABILITY_LENGTH 4
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#define NEW_LABEL_LENGTH_LENGTH 2
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#define NEW_PROTOCOL_LENGTH_LENGTH 2
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#define NEW_OPEN_REQUEST_HEADER_LENGTH (guint)(NEW_MESSAGE_TYPE_LENGTH + \
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NEW_CHANNEL_TYPE_LENGTH + \
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NEW_PRIORITY_LENGTH + \
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NEW_RELIABILITY_LENGTH + \
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NEW_LABEL_LENGTH_LENGTH + \
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NEW_PROTOCOL_LENGTH_LENGTH)
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#define NEW_MESSAGE_TYPE_OFFSET 0
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#define NEW_CHANNEL_TYPE_OFFSET (NEW_MESSAGE_TYPE_OFFSET + NEW_MESSAGE_TYPE_LENGTH)
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#define NEW_PRIORITY_OFFSET (NEW_CHANNEL_TYPE_OFFSET + NEW_CHANNEL_TYPE_LENGTH)
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#define NEW_RELIABILITY_OFFSET (NEW_PRIORITY_OFFSET + NEW_PRIORITY_LENGTH)
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#define NEW_LABEL_LENGTH_OFFSET (NEW_RELIABILITY_OFFSET + NEW_RELIABILITY_LENGTH)
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#define NEW_PROTOCOL_LENGTH_OFFSET (NEW_LABEL_LENGTH_OFFSET + NEW_LABEL_LENGTH_LENGTH)
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#define NEW_LABEL_OFFSET (NEW_PROTOCOL_LENGTH_OFFSET + NEW_PROTOCOL_LENGTH_LENGTH)
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static void
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dissect_new_open_request_message(tvbuff_t *tvb, packet_info *pinfo, proto_tree *rtcdc_tree, proto_item *rtcdc_item)
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{
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guint8 channel_type;
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guint32 reliability;
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guint16 label_length;
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guint16 protocol_length;
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channel_type = tvb_get_guint8(tvb, NEW_CHANNEL_TYPE_OFFSET);
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if ((channel_type & 0x7f) > 0x02) {
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expert_add_info(pinfo, rtcdc_item, &ei_rtcdc_new_channel_type);
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}
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reliability = tvb_get_ntohl(tvb, NEW_RELIABILITY_OFFSET);
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if ((reliability > 0) && ((channel_type & 0x7f) == 0x00)) {
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expert_add_info(pinfo, rtcdc_item, &ei_rtcdc_new_reliability_non_zero);
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}
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label_length = tvb_get_ntohs(tvb, NEW_LABEL_LENGTH_OFFSET);
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protocol_length = tvb_get_ntohs(tvb, NEW_PROTOCOL_LENGTH_OFFSET);
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if (NEW_OPEN_REQUEST_HEADER_LENGTH + (guint)label_length + (guint)protocol_length != tvb_reported_length(tvb)) {
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expert_add_info(pinfo, rtcdc_item, &ei_rtcdc_inconsistent_label_and_parameter_length);
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}
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if (rtcdc_tree) {
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proto_tree_add_item(rtcdc_tree, hf_new_channel_type, tvb, NEW_CHANNEL_TYPE_OFFSET, NEW_CHANNEL_TYPE_LENGTH, ENC_BIG_ENDIAN);
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proto_tree_add_item(rtcdc_tree, hf_new_priority, tvb, NEW_PRIORITY_OFFSET, NEW_PRIORITY_LENGTH, ENC_BIG_ENDIAN);
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proto_tree_add_item(rtcdc_tree, hf_new_reliability, tvb, NEW_RELIABILITY_OFFSET, NEW_RELIABILITY_LENGTH, ENC_BIG_ENDIAN);
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proto_tree_add_item(rtcdc_tree, hf_new_label_length, tvb, NEW_LABEL_LENGTH_OFFSET, NEW_LABEL_LENGTH_LENGTH, ENC_BIG_ENDIAN);
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proto_tree_add_item(rtcdc_tree, hf_new_protocol_length, tvb, NEW_PROTOCOL_LENGTH_OFFSET, NEW_PROTOCOL_LENGTH_LENGTH, ENC_BIG_ENDIAN);
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proto_tree_add_item(rtcdc_tree, hf_new_label, tvb, NEW_LABEL_OFFSET, label_length, ENC_ASCII|ENC_NA);
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proto_tree_add_item(rtcdc_tree, hf_new_protocol, tvb, NEW_LABEL_OFFSET + label_length, protocol_length, ENC_ASCII|ENC_NA);
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}
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return;
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}
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static int
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dissect_rtcdc(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
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{
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proto_item *rtcdc_item, *msg_item;
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proto_tree *rtcdc_tree;
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guint8 message_type;
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message_type = tvb_get_guint8(tvb, MESSAGE_TYPE_OFFSET);
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "RTCDC");
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col_add_fstr(pinfo->cinfo, COL_INFO, "%s ", val_to_str_const(message_type, message_type_values, "reserved"));
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rtcdc_item = proto_tree_add_item(tree, proto_rtcdc, tvb, 0, -1, ENC_NA);
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rtcdc_tree = proto_item_add_subtree(rtcdc_item, ett_rtcdc);
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msg_item = proto_tree_add_item(rtcdc_tree, hf_message_type, tvb, MESSAGE_TYPE_OFFSET, MESSAGE_TYPE_LENGTH, ENC_BIG_ENDIAN);
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switch (message_type) {
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case DATA_CHANNEL_OPEN_REQUEST:
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dissect_open_request_message(tvb, pinfo, rtcdc_tree, rtcdc_item);
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break;
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case DATA_CHANNEL_OPEN_RESPONSE:
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dissect_open_response_message(tvb, pinfo, rtcdc_tree, rtcdc_item);
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break;
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case DATA_CHANNEL_ACK:
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dissect_open_ack_message(tvb, pinfo, rtcdc_tree, rtcdc_item);
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break;
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case DATA_CHANNEL_NEW_OPEN_REQUEST:
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dissect_new_open_request_message(tvb, pinfo, rtcdc_tree, rtcdc_item);
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break;
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default:
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expert_add_info(pinfo, msg_item, &ei_rtcdc_message_type_unknown);
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break;
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}
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return tvb_captured_length(tvb);
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}
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void
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proto_register_rtcdc(void)
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{
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module_t *rtcdc_module;
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expert_module_t *expert_rtcdc;
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static hf_register_info hf[] = {
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{ &hf_message_type,
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{ "Message type", "rtcdc.message_type",
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FT_UINT8, BASE_DEC, VALS(message_type_values), 0x0,
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NULL, HFILL }
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},
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{ &hf_channel_type,
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{ "Channel type", "rtcdc.channel_type",
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FT_UINT8, BASE_DEC, VALS(channel_type_values), 0x0,
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NULL, HFILL }
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},
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{ &hf_flags,
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{ "Flags", "rtcdc.flags",
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FT_UINT16, BASE_HEX, NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_flags_reserved,
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{ "Reserved", "rtcdc.flags_reserved",
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FT_UINT16, BASE_HEX, NULL, DATA_CHANNEL_FLAG_RESERVED_MASK,
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NULL, HFILL }
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},
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{ &hf_unordered_allowed,
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{ "Unordered allowed", "rtcdc.flags_unordered_allowed",
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FT_BOOLEAN, 16, NULL, DATA_CHANNEL_FLAG_OUT_OF_ORDER_ALLOWED_MASK,
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NULL, HFILL }
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},
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{ &hf_reliability,
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{ "Reliability parameter", "rtcdc.reliability_parameter",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_priority,
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{ "Priority", "rtcdc.priority",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_label,
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{ "Label", "rtcdc.label",
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FT_STRING, BASE_NONE, NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_error,
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{ "Error", "rtcdc.error",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_sid,
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{ "Reverse stream identifier", "rtcdc.reverse_stream_id",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_new_channel_type,
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{ "Channel type", "rtcdc.channel_type",
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FT_UINT8, BASE_DEC, VALS(new_channel_type_values), 0x0,
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NULL, HFILL }
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},
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{ &hf_new_reliability,
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{ "Reliability parameter", "rtcdc.reliability_parameter",
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FT_UINT32, BASE_DEC, NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_new_priority,
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{ "Priority", "rtcdc.priority",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_new_label_length,
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{ "Label length", "rtcdc.label_length",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_new_protocol_length,
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{ "Protocol length", "rtcdc.protocol_length",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_new_label,
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{ "Label", "rtcdc.label",
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FT_STRING, BASE_NONE, NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_new_protocol,
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{ "Protocol", "rtcdc.protocol",
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FT_STRING, BASE_NONE, NULL, 0x0,
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NULL, HFILL }
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}
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};
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static gint *ett[] = {
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&ett_rtcdc,
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&ett_flags
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};
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static ei_register_info ei[] = {
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{ &ei_rtcdc_message_too_long, { "rtcdc.message_too_long", PI_MALFORMED, PI_ERROR, "Message too long", EXPFILL }},
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{ &ei_rtcdc_new_channel_type, { "rtcdc.channel_type.unknown", PI_PROTOCOL, PI_WARN, "Unknown channel type", EXPFILL }},
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{ &ei_rtcdc_new_reliability_non_zero, { "rtcdc.reliability_parameter.non_zero", PI_PROTOCOL, PI_WARN, "Reliability parameter non zero for reliable channel", EXPFILL }},
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{ &ei_rtcdc_inconsistent_label_and_parameter_length, { "rtcdc.inconsistent_label_and_parameter_length", PI_MALFORMED, PI_ERROR, "Inconsistent label and parameter length", EXPFILL }},
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{ &ei_rtcdc_message_type_unknown, { "rtcdc.message_type.unknown", PI_PROTOCOL, PI_WARN, "Unknown message type", EXPFILL }},
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};
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proto_rtcdc = proto_register_protocol("WebRTC Datachannel Protocol", "RTCDC", "rtcdc");
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proto_register_field_array(proto_rtcdc, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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expert_rtcdc = expert_register_protocol(proto_rtcdc);
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expert_register_field_array(expert_rtcdc, ei, array_length(ei));
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rtcdc_module = prefs_register_protocol(proto_rtcdc, proto_reg_handoff_rtcdc);
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prefs_register_uint_preference(rtcdc_module, "sctp.ppi", "RTCDC SCTP PPID", "RTCDC SCTP PPID if other than the default", 10, &rtcdc_ppid);
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_rtcdc(void)
|
|
{
|
|
static gboolean initialized = FALSE;
|
|
static dissector_handle_t rtcdc_handle;
|
|
static guint32 current_ppid;
|
|
|
|
if (!initialized) {
|
|
rtcdc_handle = create_dissector_handle(dissect_rtcdc, proto_rtcdc);
|
|
initialized = TRUE;
|
|
} else {
|
|
dissector_delete_uint("sctp.ppi", current_ppid, rtcdc_handle);
|
|
}
|
|
current_ppid = rtcdc_ppid;
|
|
dissector_add_uint("sctp.ppi", current_ppid, rtcdc_handle);
|
|
}
|
|
|
|
/*
|
|
* Editor modelines - http://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:
|
|
*/
|