1 /*
2 * libjingle
3 * Copyright 2013 Google Inc.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice,
9 * this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright notice,
11 * this list of conditions and the following disclaimer in the documentation
12 * and/or other materials provided with the distribution.
13 * 3. The name of the author may not be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
19 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
20 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 #include "talk/app/webrtc/sctputils.h"
29
30 #include "webrtc/base/buffer.h"
31 #include "webrtc/base/bytebuffer.h"
32 #include "webrtc/base/logging.h"
33
34 namespace webrtc {
35
36 // Format defined at
37 // http://tools.ietf.org/html/draft-ietf-rtcweb-data-protocol-01#section
38
39 static const uint8_t DATA_CHANNEL_OPEN_MESSAGE_TYPE = 0x03;
40 static const uint8_t DATA_CHANNEL_OPEN_ACK_MESSAGE_TYPE = 0x02;
41
42 enum DataChannelOpenMessageChannelType {
43 DCOMCT_ORDERED_RELIABLE = 0x00,
44 DCOMCT_ORDERED_PARTIAL_RTXS = 0x01,
45 DCOMCT_ORDERED_PARTIAL_TIME = 0x02,
46 DCOMCT_UNORDERED_RELIABLE = 0x80,
47 DCOMCT_UNORDERED_PARTIAL_RTXS = 0x81,
48 DCOMCT_UNORDERED_PARTIAL_TIME = 0x82,
49 };
50
IsOpenMessage(const rtc::Buffer & payload)51 bool IsOpenMessage(const rtc::Buffer& payload) {
52 // Format defined at
53 // http://tools.ietf.org/html/draft-jesup-rtcweb-data-protocol-04
54
55 rtc::ByteBuffer buffer(payload);
56 uint8_t message_type;
57 if (!buffer.ReadUInt8(&message_type)) {
58 LOG(LS_WARNING) << "Could not read OPEN message type.";
59 return false;
60 }
61 return message_type == DATA_CHANNEL_OPEN_MESSAGE_TYPE;
62 }
63
ParseDataChannelOpenMessage(const rtc::Buffer & payload,std::string * label,DataChannelInit * config)64 bool ParseDataChannelOpenMessage(const rtc::Buffer& payload,
65 std::string* label,
66 DataChannelInit* config) {
67 // Format defined at
68 // http://tools.ietf.org/html/draft-jesup-rtcweb-data-protocol-04
69
70 rtc::ByteBuffer buffer(payload);
71 uint8_t message_type;
72 if (!buffer.ReadUInt8(&message_type)) {
73 LOG(LS_WARNING) << "Could not read OPEN message type.";
74 return false;
75 }
76 if (message_type != DATA_CHANNEL_OPEN_MESSAGE_TYPE) {
77 LOG(LS_WARNING) << "Data Channel OPEN message of unexpected type: "
78 << message_type;
79 return false;
80 }
81
82 uint8_t channel_type;
83 if (!buffer.ReadUInt8(&channel_type)) {
84 LOG(LS_WARNING) << "Could not read OPEN message channel type.";
85 return false;
86 }
87
88 uint16_t priority;
89 if (!buffer.ReadUInt16(&priority)) {
90 LOG(LS_WARNING) << "Could not read OPEN message reliabilility prioirty.";
91 return false;
92 }
93 uint32_t reliability_param;
94 if (!buffer.ReadUInt32(&reliability_param)) {
95 LOG(LS_WARNING) << "Could not read OPEN message reliabilility param.";
96 return false;
97 }
98 uint16_t label_length;
99 if (!buffer.ReadUInt16(&label_length)) {
100 LOG(LS_WARNING) << "Could not read OPEN message label length.";
101 return false;
102 }
103 uint16_t protocol_length;
104 if (!buffer.ReadUInt16(&protocol_length)) {
105 LOG(LS_WARNING) << "Could not read OPEN message protocol length.";
106 return false;
107 }
108 if (!buffer.ReadString(label, (size_t) label_length)) {
109 LOG(LS_WARNING) << "Could not read OPEN message label";
110 return false;
111 }
112 if (!buffer.ReadString(&config->protocol, protocol_length)) {
113 LOG(LS_WARNING) << "Could not read OPEN message protocol.";
114 return false;
115 }
116
117 config->ordered = true;
118 switch (channel_type) {
119 case DCOMCT_UNORDERED_RELIABLE:
120 case DCOMCT_UNORDERED_PARTIAL_RTXS:
121 case DCOMCT_UNORDERED_PARTIAL_TIME:
122 config->ordered = false;
123 }
124
125 config->maxRetransmits = -1;
126 config->maxRetransmitTime = -1;
127 switch (channel_type) {
128 case DCOMCT_ORDERED_PARTIAL_RTXS:
129 case DCOMCT_UNORDERED_PARTIAL_RTXS:
130 config->maxRetransmits = reliability_param;
131 break;
132 case DCOMCT_ORDERED_PARTIAL_TIME:
133 case DCOMCT_UNORDERED_PARTIAL_TIME:
134 config->maxRetransmitTime = reliability_param;
135 break;
136 }
137 return true;
138 }
139
ParseDataChannelOpenAckMessage(const rtc::Buffer & payload)140 bool ParseDataChannelOpenAckMessage(const rtc::Buffer& payload) {
141 rtc::ByteBuffer buffer(payload);
142 uint8_t message_type;
143 if (!buffer.ReadUInt8(&message_type)) {
144 LOG(LS_WARNING) << "Could not read OPEN_ACK message type.";
145 return false;
146 }
147 if (message_type != DATA_CHANNEL_OPEN_ACK_MESSAGE_TYPE) {
148 LOG(LS_WARNING) << "Data Channel OPEN_ACK message of unexpected type: "
149 << message_type;
150 return false;
151 }
152 return true;
153 }
154
WriteDataChannelOpenMessage(const std::string & label,const DataChannelInit & config,rtc::Buffer * payload)155 bool WriteDataChannelOpenMessage(const std::string& label,
156 const DataChannelInit& config,
157 rtc::Buffer* payload) {
158 // Format defined at
159 // http://tools.ietf.org/html/draft-ietf-rtcweb-data-protocol-00#section-6.1
160 uint8_t channel_type = 0;
161 uint32_t reliability_param = 0;
162 uint16_t priority = 0;
163 if (config.ordered) {
164 if (config.maxRetransmits > -1) {
165 channel_type = DCOMCT_ORDERED_PARTIAL_RTXS;
166 reliability_param = config.maxRetransmits;
167 } else if (config.maxRetransmitTime > -1) {
168 channel_type = DCOMCT_ORDERED_PARTIAL_TIME;
169 reliability_param = config.maxRetransmitTime;
170 } else {
171 channel_type = DCOMCT_ORDERED_RELIABLE;
172 }
173 } else {
174 if (config.maxRetransmits > -1) {
175 channel_type = DCOMCT_UNORDERED_PARTIAL_RTXS;
176 reliability_param = config.maxRetransmits;
177 } else if (config.maxRetransmitTime > -1) {
178 channel_type = DCOMCT_UNORDERED_PARTIAL_TIME;
179 reliability_param = config.maxRetransmitTime;
180 } else {
181 channel_type = DCOMCT_UNORDERED_RELIABLE;
182 }
183 }
184
185 rtc::ByteBuffer buffer(
186 NULL, 20 + label.length() + config.protocol.length(),
187 rtc::ByteBuffer::ORDER_NETWORK);
188 buffer.WriteUInt8(DATA_CHANNEL_OPEN_MESSAGE_TYPE);
189 buffer.WriteUInt8(channel_type);
190 buffer.WriteUInt16(priority);
191 buffer.WriteUInt32(reliability_param);
192 buffer.WriteUInt16(static_cast<uint16_t>(label.length()));
193 buffer.WriteUInt16(static_cast<uint16_t>(config.protocol.length()));
194 buffer.WriteString(label);
195 buffer.WriteString(config.protocol);
196 payload->SetData(buffer.Data(), buffer.Length());
197 return true;
198 }
199
WriteDataChannelOpenAckMessage(rtc::Buffer * payload)200 void WriteDataChannelOpenAckMessage(rtc::Buffer* payload) {
201 rtc::ByteBuffer buffer(rtc::ByteBuffer::ORDER_NETWORK);
202 buffer.WriteUInt8(DATA_CHANNEL_OPEN_ACK_MESSAGE_TYPE);
203 payload->SetData(buffer.Data(), buffer.Length());
204 }
205 } // namespace webrtc
206