mirror of
https://github.com/DrKLO/Telegram.git
synced 2024-12-23 06:50:36 +01:00
233 lines
7.4 KiB
C++
233 lines
7.4 KiB
C++
/*
|
|
* 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 "pc/sctp_utils.h"
|
|
|
|
#include <stddef.h>
|
|
#include <stdint.h>
|
|
|
|
#include "absl/types/optional.h"
|
|
#include "api/priority.h"
|
|
#include "rtc_base/byte_buffer.h"
|
|
#include "rtc_base/checks.h"
|
|
#include "rtc_base/copy_on_write_buffer.h"
|
|
#include "rtc_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,
|
|
};
|
|
|
|
// Values of priority in the DC open protocol message.
|
|
// These are compared against an integer, so are enum, not enum class.
|
|
enum DataChannelPriority {
|
|
DCO_PRIORITY_VERY_LOW = 128,
|
|
DCO_PRIORITY_LOW = 256,
|
|
DCO_PRIORITY_MEDIUM = 512,
|
|
DCO_PRIORITY_HIGH = 1024,
|
|
};
|
|
|
|
bool IsOpenMessage(const rtc::CopyOnWriteBuffer& payload) {
|
|
// Format defined at
|
|
// http://tools.ietf.org/html/draft-jesup-rtcweb-data-protocol-04
|
|
if (payload.size() < 1) {
|
|
RTC_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)) {
|
|
RTC_LOG(LS_WARNING) << "Could not read OPEN message type.";
|
|
return false;
|
|
}
|
|
if (message_type != DATA_CHANNEL_OPEN_MESSAGE_TYPE) {
|
|
RTC_LOG(LS_WARNING) << "Data Channel OPEN message of unexpected type: "
|
|
<< message_type;
|
|
return false;
|
|
}
|
|
|
|
uint8_t channel_type;
|
|
if (!buffer.ReadUInt8(&channel_type)) {
|
|
RTC_LOG(LS_WARNING) << "Could not read OPEN message channel type.";
|
|
return false;
|
|
}
|
|
|
|
uint16_t priority;
|
|
if (!buffer.ReadUInt16(&priority)) {
|
|
RTC_LOG(LS_WARNING)
|
|
<< "Could not read OPEN message reliabilility prioirty.";
|
|
return false;
|
|
}
|
|
// Parse priority as defined in
|
|
// https://w3c.github.io/webrtc-priority/#rtcdatachannel-processing-steps
|
|
if (priority <= DCO_PRIORITY_VERY_LOW) {
|
|
config->priority = Priority::kVeryLow;
|
|
} else if (priority <= DCO_PRIORITY_LOW) {
|
|
config->priority = Priority::kLow;
|
|
} else if (priority <= DCO_PRIORITY_MEDIUM) {
|
|
config->priority = Priority::kMedium;
|
|
} else {
|
|
config->priority = Priority::kHigh;
|
|
}
|
|
|
|
uint32_t reliability_param;
|
|
if (!buffer.ReadUInt32(&reliability_param)) {
|
|
RTC_LOG(LS_WARNING) << "Could not read OPEN message reliabilility param.";
|
|
return false;
|
|
}
|
|
uint16_t label_length;
|
|
if (!buffer.ReadUInt16(&label_length)) {
|
|
RTC_LOG(LS_WARNING) << "Could not read OPEN message label length.";
|
|
return false;
|
|
}
|
|
uint16_t protocol_length;
|
|
if (!buffer.ReadUInt16(&protocol_length)) {
|
|
RTC_LOG(LS_WARNING) << "Could not read OPEN message protocol length.";
|
|
return false;
|
|
}
|
|
if (!buffer.ReadString(label, (size_t)label_length)) {
|
|
RTC_LOG(LS_WARNING) << "Could not read OPEN message label";
|
|
return false;
|
|
}
|
|
if (!buffer.ReadString(&config->protocol, protocol_length)) {
|
|
RTC_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 = absl::nullopt;
|
|
config->maxRetransmitTime = absl::nullopt;
|
|
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) {
|
|
RTC_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) {
|
|
RTC_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-09#section-5.1
|
|
uint8_t channel_type = 0;
|
|
uint32_t reliability_param = 0;
|
|
uint16_t priority = 0;
|
|
// Set priority according to
|
|
// https://tools.ietf.org/html/draft-ietf-rtcweb-data-channel-12#section-6.4
|
|
if (config.priority) {
|
|
switch (*config.priority) {
|
|
case Priority::kVeryLow:
|
|
priority = DCO_PRIORITY_VERY_LOW;
|
|
break;
|
|
case Priority::kLow:
|
|
priority = DCO_PRIORITY_LOW;
|
|
break;
|
|
case Priority::kMedium:
|
|
priority = DCO_PRIORITY_MEDIUM;
|
|
break;
|
|
case Priority::kHigh:
|
|
priority = DCO_PRIORITY_HIGH;
|
|
break;
|
|
}
|
|
}
|
|
if (config.ordered) {
|
|
if (config.maxRetransmits) {
|
|
channel_type = DCOMCT_ORDERED_PARTIAL_RTXS;
|
|
reliability_param = *config.maxRetransmits;
|
|
} else if (config.maxRetransmitTime) {
|
|
channel_type = DCOMCT_ORDERED_PARTIAL_TIME;
|
|
reliability_param = *config.maxRetransmitTime;
|
|
} else {
|
|
channel_type = DCOMCT_ORDERED_RELIABLE;
|
|
}
|
|
} else {
|
|
if (config.maxRetransmits) {
|
|
channel_type = DCOMCT_UNORDERED_PARTIAL_RTXS;
|
|
reliability_param = *config.maxRetransmits;
|
|
} else if (config.maxRetransmitTime) {
|
|
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());
|
|
// 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
|