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/*
* Copyright 2013 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "webrtc/api/sctputils.h"
#include "webrtc/base/bytebuffer.h"
#include "webrtc/base/copyonwritebuffer.h"
#include "webrtc/base/logging.h"
namespace webrtc {
// Format defined at
// http://tools.ietf.org/html/draft-ietf-rtcweb-data-protocol-01#section
static const uint8_t DATA_CHANNEL_OPEN_MESSAGE_TYPE = 0x03;
static const uint8_t DATA_CHANNEL_OPEN_ACK_MESSAGE_TYPE = 0x02;
enum DataChannelOpenMessageChannelType {
DCOMCT_ORDERED_RELIABLE = 0x00,
DCOMCT_ORDERED_PARTIAL_RTXS = 0x01,
DCOMCT_ORDERED_PARTIAL_TIME = 0x02,
DCOMCT_UNORDERED_RELIABLE = 0x80,
DCOMCT_UNORDERED_PARTIAL_RTXS = 0x81,
DCOMCT_UNORDERED_PARTIAL_TIME = 0x82,
};
bool IsOpenMessage(const rtc::CopyOnWriteBuffer& payload) {
// Format defined at
// http://tools.ietf.org/html/draft-jesup-rtcweb-data-protocol-04
if (payload.size() < 1) {
LOG(LS_WARNING) << "Could not read OPEN message type.";
return false;
}
uint8_t message_type = payload[0];
return message_type == DATA_CHANNEL_OPEN_MESSAGE_TYPE;
}
bool ParseDataChannelOpenMessage(const rtc::CopyOnWriteBuffer& payload,
std::string* label,
DataChannelInit* config) {
// Format defined at
// http://tools.ietf.org/html/draft-jesup-rtcweb-data-protocol-04
rtc::ByteBufferReader buffer(payload.data<char>(), payload.size());
uint8_t message_type;
if (!buffer.ReadUInt8(&message_type)) {
LOG(LS_WARNING) << "Could not read OPEN message type.";
return false;
}
if (message_type != DATA_CHANNEL_OPEN_MESSAGE_TYPE) {
LOG(LS_WARNING) << "Data Channel OPEN message of unexpected type: "
<< message_type;
return false;
}
uint8_t channel_type;
if (!buffer.ReadUInt8(&channel_type)) {
LOG(LS_WARNING) << "Could not read OPEN message channel type.";
return false;
}
uint16_t priority;
if (!buffer.ReadUInt16(&priority)) {
LOG(LS_WARNING) << "Could not read OPEN message reliabilility prioirty.";
return false;
}
uint32_t reliability_param;
if (!buffer.ReadUInt32(&reliability_param)) {
LOG(LS_WARNING) << "Could not read OPEN message reliabilility param.";
return false;
}
uint16_t label_length;
if (!buffer.ReadUInt16(&label_length)) {
LOG(LS_WARNING) << "Could not read OPEN message label length.";
return false;
}
uint16_t protocol_length;
if (!buffer.ReadUInt16(&protocol_length)) {
LOG(LS_WARNING) << "Could not read OPEN message protocol length.";
return false;
}
if (!buffer.ReadString(label, (size_t) label_length)) {
LOG(LS_WARNING) << "Could not read OPEN message label";
return false;
}
if (!buffer.ReadString(&config->protocol, protocol_length)) {
LOG(LS_WARNING) << "Could not read OPEN message protocol.";
return false;
}
config->ordered = true;
switch (channel_type) {
case DCOMCT_UNORDERED_RELIABLE:
case DCOMCT_UNORDERED_PARTIAL_RTXS:
case DCOMCT_UNORDERED_PARTIAL_TIME:
config->ordered = false;
}
config->maxRetransmits = -1;
config->maxRetransmitTime = -1;
switch (channel_type) {
case DCOMCT_ORDERED_PARTIAL_RTXS:
case DCOMCT_UNORDERED_PARTIAL_RTXS:
config->maxRetransmits = reliability_param;
break;
case DCOMCT_ORDERED_PARTIAL_TIME:
case DCOMCT_UNORDERED_PARTIAL_TIME:
config->maxRetransmitTime = reliability_param;
break;
}
return true;
}
bool ParseDataChannelOpenAckMessage(const rtc::CopyOnWriteBuffer& payload) {
if (payload.size() < 1) {
LOG(LS_WARNING) << "Could not read OPEN_ACK message type.";
return false;
}
uint8_t message_type = payload[0];
if (message_type != DATA_CHANNEL_OPEN_ACK_MESSAGE_TYPE) {
LOG(LS_WARNING) << "Data Channel OPEN_ACK message of unexpected type: "
<< message_type;
return false;
}
return true;
}
bool WriteDataChannelOpenMessage(const std::string& label,
const DataChannelInit& config,
rtc::CopyOnWriteBuffer* payload) {
// Format defined at
// http://tools.ietf.org/html/draft-ietf-rtcweb-data-protocol-00#section-6.1
uint8_t channel_type = 0;
uint32_t reliability_param = 0;
uint16_t priority = 0;
if (config.ordered) {
if (config.maxRetransmits > -1) {
channel_type = DCOMCT_ORDERED_PARTIAL_RTXS;
reliability_param = config.maxRetransmits;
} else if (config.maxRetransmitTime > -1) {
channel_type = DCOMCT_ORDERED_PARTIAL_TIME;
reliability_param = config.maxRetransmitTime;
} else {
channel_type = DCOMCT_ORDERED_RELIABLE;
}
} else {
if (config.maxRetransmits > -1) {
channel_type = DCOMCT_UNORDERED_PARTIAL_RTXS;
reliability_param = config.maxRetransmits;
} else if (config.maxRetransmitTime > -1) {
channel_type = DCOMCT_UNORDERED_PARTIAL_TIME;
reliability_param = config.maxRetransmitTime;
} else {
channel_type = DCOMCT_UNORDERED_RELIABLE;
}
}
rtc::ByteBufferWriter buffer(
NULL, 20 + label.length() + config.protocol.length(),
rtc::ByteBuffer::ORDER_NETWORK);
// TODO(tommi): Add error handling and check resulting length.
buffer.WriteUInt8(DATA_CHANNEL_OPEN_MESSAGE_TYPE);
buffer.WriteUInt8(channel_type);
buffer.WriteUInt16(priority);
buffer.WriteUInt32(reliability_param);
buffer.WriteUInt16(static_cast<uint16_t>(label.length()));
buffer.WriteUInt16(static_cast<uint16_t>(config.protocol.length()));
buffer.WriteString(label);
buffer.WriteString(config.protocol);
payload->SetData(buffer.Data(), buffer.Length());
return true;
}
void WriteDataChannelOpenAckMessage(rtc::CopyOnWriteBuffer* payload) {
uint8_t data = DATA_CHANNEL_OPEN_ACK_MESSAGE_TYPE;
payload->SetData(&data, sizeof(data));
}
} // namespace webrtc
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