mirror of
https://github.com/ZLMediaKit/ZLMediaKit.git
synced 2024-11-24 11:40:37 +08:00
623 lines
16 KiB
C++
623 lines
16 KiB
C++
#include <atomic>
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#include "Util/MD5.h"
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#include "Util/logger.h"
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#include "Packet.hpp"
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namespace SRT {
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const size_t DataPacket::HEADER_SIZE;
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const size_t ControlPacket::HEADER_SIZE;
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const size_t HandshakePacket::HS_CONTENT_MIN_SIZE;
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bool DataPacket::isDataPacket(uint8_t *buf, size_t len) {
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if (len < HEADER_SIZE) {
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WarnL << "data size" << len << " less " << HEADER_SIZE;
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return false;
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}
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if (!(buf[0] & 0x80)) {
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return true;
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}
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return false;
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}
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uint32_t DataPacket::getSocketID(uint8_t *buf, size_t len) {
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uint8_t *ptr = buf;
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ptr += 12;
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return loadUint32(ptr);
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}
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bool DataPacket::loadFromData(uint8_t *buf, size_t len) {
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if (len < HEADER_SIZE) {
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WarnL << "data size" << len << " less " << HEADER_SIZE;
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return false;
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}
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uint8_t *ptr = buf;
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f = ptr[0] >> 7;
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packet_seq_number = loadUint32(ptr) & 0x7fffffff;
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ptr += 4;
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PP = ptr[0] >> 6;
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O = (ptr[0] & 0x20) >> 5;
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KK = (ptr[0] & 0x18) >> 3;
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R = (ptr[0] & 0x04) >> 2;
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msg_number = (ptr[0] & 0x03) << 24 | ptr[1] << 12 | ptr[2] << 8 | ptr[3];
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ptr += 4;
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timestamp = loadUint32(ptr);
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ptr += 4;
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dst_socket_id = loadUint32(ptr);
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ptr += 4;
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_data = BufferRaw::create();
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_data->assign((char *)(buf), len);
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return true;
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}
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bool DataPacket::storeToHeader() {
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if (!_data || _data->size() < HEADER_SIZE) {
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WarnL << "data size less " << HEADER_SIZE;
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return false;
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}
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uint8_t *ptr = (uint8_t *)_data->data();
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ptr[0] = packet_seq_number >> 24;
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ptr[1] = (packet_seq_number >> 16) & 0xff;
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ptr[2] = (packet_seq_number >> 8) & 0xff;
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ptr[3] = packet_seq_number & 0xff;
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ptr += 4;
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ptr[0] = PP << 6;
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ptr[0] |= O << 5;
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ptr[0] |= KK << 3;
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ptr[0] |= R << 2;
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ptr[0] |= (msg_number & 0xff000000) >> 24;
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ptr[1] = (msg_number & 0xff0000) >> 16;
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ptr[2] = (msg_number & 0xff00) >> 8;
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ptr[3] = msg_number & 0xff;
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ptr += 4;
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storeUint32(ptr, timestamp);
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ptr += 4;
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storeUint32(ptr, dst_socket_id);
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ptr += 4;
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return true;
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}
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bool DataPacket::storeToData(uint8_t *buf, size_t len) {
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_data = BufferRaw::create();
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_data->setCapacity(len + HEADER_SIZE);
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_data->setSize(len + HEADER_SIZE);
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uint8_t *ptr = (uint8_t *)_data->data();
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ptr[0] = packet_seq_number >> 24;
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ptr[1] = (packet_seq_number >> 16) & 0xff;
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ptr[2] = (packet_seq_number >> 8) & 0xff;
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ptr[3] = packet_seq_number & 0xff;
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ptr += 4;
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ptr[0] = PP << 6;
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ptr[0] |= O << 5;
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ptr[0] |= KK << 3;
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ptr[0] |= R << 2;
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ptr[0] |= (msg_number & 0xff000000) >> 24;
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ptr[1] = (msg_number & 0xff0000) >> 16;
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ptr[2] = (msg_number & 0xff00) >> 8;
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ptr[3] = msg_number & 0xff;
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ptr += 4;
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storeUint32(ptr, timestamp);
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ptr += 4;
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storeUint32(ptr, dst_socket_id);
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ptr += 4;
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memcpy(ptr, buf, len);
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return true;
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}
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char *DataPacket::data() const {
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if (!_data)
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return nullptr;
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return _data->data();
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}
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size_t DataPacket::size() const {
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if (!_data) {
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return 0;
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}
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return _data->size();
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}
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char *DataPacket::payloadData() {
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if (!_data)
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return nullptr;
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return _data->data() + HEADER_SIZE;
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}
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size_t DataPacket::payloadSize() {
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if (!_data) {
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return 0;
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}
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return _data->size() - HEADER_SIZE;
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}
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bool ControlPacket::isControlPacket(uint8_t *buf, size_t len) {
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if (len < HEADER_SIZE) {
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WarnL << "data size" << len << " less " << HEADER_SIZE;
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return false;
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}
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if (buf[0] & 0x80) {
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return true;
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}
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return false;
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}
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uint16_t ControlPacket::getControlType(uint8_t *buf, size_t len) {
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uint8_t *ptr = buf;
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uint16_t control_type = (ptr[0] & 0x7f) << 8 | ptr[1];
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return control_type;
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}
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bool ControlPacket::loadHeader() {
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uint8_t *ptr = (uint8_t *)_data->data();
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f = ptr[0] >> 7;
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control_type = (ptr[0] & 0x7f) << 8 | ptr[1];
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ptr += 2;
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sub_type = loadUint16(ptr);
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ptr += 2;
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type_specific_info[0] = ptr[0];
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type_specific_info[1] = ptr[1];
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type_specific_info[2] = ptr[2];
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type_specific_info[3] = ptr[3];
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ptr += 4;
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timestamp = loadUint32(ptr);
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ptr += 4;
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dst_socket_id = loadUint32(ptr);
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ptr += 4;
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return true;
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}
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bool ControlPacket::storeToHeader() {
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uint8_t *ptr = (uint8_t *)_data->data();
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ptr[0] = 0x80;
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ptr[0] |= control_type >> 8;
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ptr[1] = control_type & 0xff;
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ptr += 2;
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storeUint16(ptr, sub_type);
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ptr += 2;
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ptr[0] = type_specific_info[0];
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ptr[1] = type_specific_info[1];
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ptr[2] = type_specific_info[2];
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ptr[3] = type_specific_info[3];
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ptr += 4;
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storeUint32(ptr, timestamp);
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ptr += 4;
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storeUint32(ptr, dst_socket_id);
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ptr += 4;
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return true;
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}
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char *ControlPacket::data() const {
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if (!_data)
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return nullptr;
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return _data->data();
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}
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size_t ControlPacket::size() const {
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if (!_data) {
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return 0;
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}
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return _data->size();
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}
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uint32_t ControlPacket::getSocketID(uint8_t *buf, size_t len) {
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return loadUint32(buf + 12);
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}
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std::string HandshakePacket::dump(){
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_StrPrinter printer;
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printer <<"flag:"<< (int)f<<"\r\n";
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printer <<"control_type:"<< (int)control_type<<"\r\n";
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printer <<"sub_type:"<< (int)sub_type<<"\r\n";
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printer <<"type_specific_info:"<< (int)type_specific_info[0]<<":"<<(int)type_specific_info[1]<<":"<<(int)type_specific_info[2]<<":"<<(int)type_specific_info[3]<<"\r\n";
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printer <<"timestamp:"<< timestamp<<"\r\n";
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printer <<"dst_socket_id:"<< dst_socket_id<<"\r\n";
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printer <<"version:"<< version<<"\r\n";
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printer <<"encryption_field:"<< encryption_field<<"\r\n";
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printer <<"extension_field:"<< extension_field<<"\r\n";
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printer <<"initial_packet_sequence_number:"<< initial_packet_sequence_number<<"\r\n";
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printer <<"mtu:"<< mtu<<"\r\n";
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printer <<"max_flow_window_size:"<< max_flow_window_size<<"\r\n";
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printer <<"handshake_type:"<< handshake_type<<"\r\n";
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printer <<"srt_socket_id:"<< srt_socket_id<<"\r\n";
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printer <<"syn_cookie:"<< syn_cookie<<"\r\n";
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printer <<"peer_ip_addr:";
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for(size_t i=0;i<sizeof(peer_ip_addr);++i){
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printer<<(int)peer_ip_addr[i]<<":";
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}
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printer<<"\r\n";
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for(size_t i=0;i<ext_list.size();++i){
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printer<<ext_list[i]->dump()<<"\r\n";
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}
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return std::move(printer);
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}
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bool HandshakePacket::loadFromData(uint8_t *buf, size_t len) {
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if (HEADER_SIZE + HS_CONTENT_MIN_SIZE > len) {
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ErrorL << "size too smalle " << encryption_field;
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return false;
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}
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_data = BufferRaw::create();
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_data->assign((char *)(buf), len);
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ControlPacket::loadHeader();
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uint8_t *ptr = (uint8_t *)_data->data() + HEADER_SIZE;
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// parse CIF
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version = loadUint32(ptr);
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ptr += 4;
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encryption_field = loadUint16(ptr);
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ptr += 2;
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extension_field = loadUint16(ptr);
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ptr += 2;
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initial_packet_sequence_number = loadUint32(ptr);
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ptr += 4;
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mtu = loadUint32(ptr);
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ptr += 4;
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max_flow_window_size = loadUint32(ptr);
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ptr += 4;
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handshake_type = loadUint32(ptr);
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ptr += 4;
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srt_socket_id = loadUint32(ptr);
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ptr += 4;
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syn_cookie = loadUint32(ptr);
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ptr += 4;
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memcpy(peer_ip_addr, ptr, sizeof(peer_ip_addr));
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ptr += sizeof(peer_ip_addr);
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if (encryption_field != NO_ENCRYPTION) {
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ErrorL << "not support encryption " << encryption_field;
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}
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if (extension_field == 0) {
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return true;
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}
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if (len == HEADER_SIZE + HS_CONTENT_MIN_SIZE) {
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// ErrorL << "extension filed not exist " << extension_field;
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return true;
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}
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return loadExtMessage(ptr, len - HS_CONTENT_MIN_SIZE - HEADER_SIZE);
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}
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bool HandshakePacket::loadExtMessage(uint8_t *buf, size_t len) {
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uint8_t *ptr = buf;
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ext_list.clear();
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uint16_t type;
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uint16_t length;
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HSExt::Ptr ext;
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while (ptr < buf + len) {
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type = loadUint16(ptr);
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length = loadUint16(ptr + 2);
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switch (type) {
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case HSExt::SRT_CMD_HSREQ:
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case HSExt::SRT_CMD_HSRSP: ext = std::make_shared<HSExtMessage>(); break;
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case HSExt::SRT_CMD_SID: ext = std::make_shared<HSExtStreamID>(); break;
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default: WarnL << "not support ext " << type; break;
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}
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if (ext) {
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if (ext->loadFromData(ptr, length * 4 + 4)) {
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ext_list.push_back(std::move(ext));
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} else {
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WarnL << "parse HS EXT failed type=" << type << " len=" << length;
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}
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ext = nullptr;
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}
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ptr += length * 4 + 4;
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}
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return true;
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}
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bool HandshakePacket::storeExtMessage() {
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uint8_t *buf = (uint8_t *)_data->data() + HEADER_SIZE + 48;
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size_t len = _data->size() - HEADER_SIZE - 48;
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for (auto ex : ext_list) {
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memcpy(buf, ex->data(), ex->size());
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buf += ex->size();
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}
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return true;
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}
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size_t HandshakePacket::getExtSize() {
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size_t size = 0;
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for (auto it : ext_list) {
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size += it->size();
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}
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return size;
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}
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bool HandshakePacket::storeToData() {
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_data = BufferRaw::create();
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for (auto ex : ext_list) {
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ex->storeToData();
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}
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auto ext_size = getExtSize();
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_data->setCapacity(HEADER_SIZE + 48 + ext_size);
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_data->setSize(HEADER_SIZE + 48 + ext_size);
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control_type = ControlPacket::HANDSHAKE;
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sub_type = 0;
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ControlPacket::storeToHeader();
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uint8_t *ptr = (uint8_t *)_data->data() + HEADER_SIZE;
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storeUint32(ptr, version);
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ptr += 4;
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storeUint16(ptr, encryption_field);
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ptr += 2;
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storeUint16(ptr, extension_field);
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ptr += 2;
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storeUint32(ptr, initial_packet_sequence_number);
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ptr += 4;
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storeUint32(ptr, mtu);
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ptr += 4;
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storeUint32(ptr, max_flow_window_size);
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ptr += 4;
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storeUint32(ptr, handshake_type);
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ptr += 4;
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storeUint32(ptr, srt_socket_id);
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ptr += 4;
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storeUint32(ptr, syn_cookie);
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ptr += 4;
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memcpy(ptr, peer_ip_addr, sizeof(peer_ip_addr));
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ptr += sizeof(peer_ip_addr);
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if (encryption_field != NO_ENCRYPTION) {
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ErrorL << "not support encryption " << encryption_field;
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}
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assert(encryption_field == NO_ENCRYPTION);
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return storeExtMessage();
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}
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bool HandshakePacket::isHandshakePacket(uint8_t *buf, size_t len) {
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if (!ControlPacket::isControlPacket(buf, len)) {
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return false;
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}
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if (len < HEADER_SIZE + 48) {
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return false;
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}
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return ControlPacket::getControlType(buf, len) == HANDSHAKE;
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}
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uint32_t HandshakePacket::getHandshakeType(uint8_t *buf, size_t len) {
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uint8_t *ptr = buf + HEADER_SIZE + 5 * 4;
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return loadUint32(ptr);
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}
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uint32_t HandshakePacket::getSynCookie(uint8_t *buf, size_t len) {
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uint8_t *ptr = buf + HEADER_SIZE + 7 * 4;
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return loadUint32(ptr);
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}
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void HandshakePacket::assignPeerIP(struct sockaddr_storage *addr) {
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memset(peer_ip_addr, 0, sizeof(peer_ip_addr));
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if (addr->ss_family == AF_INET) {
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struct sockaddr_in *ipv4 = (struct sockaddr_in *)addr;
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// 抓包 奇怪好像是小头端？？？ [AUTO-TRANSLATED:40eb164c]
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// Packet capture, weird, seems to be from the client side？？？ [AUTO-TRANSLATED:6109d8a0]
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// Packet capture, weird, seems to be from the client side？？？
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storeUint32LE(peer_ip_addr, ipv4->sin_addr.s_addr);
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} else if (addr->ss_family == AF_INET6) {
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if (IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)addr)->sin6_addr)) {
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struct in_addr addr4;
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memcpy(&addr4, 12 + (char *)&(((struct sockaddr_in6 *)addr)->sin6_addr), 4);
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storeUint32LE(peer_ip_addr, addr4.s_addr);
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} else {
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const sockaddr_in6 *ipv6 = (struct sockaddr_in6 *)addr;
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memcpy(peer_ip_addr, ipv6->sin6_addr.s6_addr, sizeof(peer_ip_addr));
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}
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}
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}
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uint32_t HandshakePacket::generateSynCookie(
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struct sockaddr_storage *addr, TimePoint ts, uint32_t current_cookie, int correction) {
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static std::atomic<uint32_t> distractor { 0 };
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uint32_t rollover = distractor.load() + 10;
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while (true) {
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// SYN cookie
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int64_t timestamp = (DurationCountMicroseconds(SteadyClock::now() - ts) / 60000000) + distractor.load()
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+ correction; // secret changes every one minute
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std::stringstream cookiestr;
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cookiestr << SockUtil::inet_ntoa((struct sockaddr *)addr) << ":" << SockUtil::inet_port((struct sockaddr *)addr)
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<< ":" << timestamp;
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union {
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unsigned char cookie[16];
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uint32_t cookie_val;
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};
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MD5 md5(cookiestr.str());
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memcpy(cookie, md5.rawdigest().c_str(), 16);
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if (cookie_val != current_cookie) {
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return cookie_val;
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}
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++distractor;
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// This is just to make the loop formally breakable,
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// but this is virtually impossible to happen.
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if (distractor == rollover) {
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return cookie_val;
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}
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}
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}
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bool KeepLivePacket::loadFromData(uint8_t *buf, size_t len) {
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if (len < HEADER_SIZE) {
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WarnL << "data size" << len << " less " << HEADER_SIZE;
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return false;
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}
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_data = BufferRaw::create();
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_data->assign((char *)buf, len);
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return loadHeader();
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}
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bool KeepLivePacket::storeToData() {
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control_type = ControlPacket::KEEPALIVE;
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sub_type = 0;
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|
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_data = BufferRaw::create();
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_data->setCapacity(HEADER_SIZE);
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_data->setSize(HEADER_SIZE);
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return storeToHeader();
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}
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bool NAKPacket::loadFromData(uint8_t *buf, size_t len) {
|
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if (len < HEADER_SIZE) {
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WarnL << "data size" << len << " less " << HEADER_SIZE;
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return false;
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}
|
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_data = BufferRaw::create();
|
||
_data->assign((char *)buf, len);
|
||
loadHeader();
|
||
|
||
uint8_t *ptr = (uint8_t *)_data->data() + HEADER_SIZE;
|
||
uint8_t *end = (uint8_t *)_data->data() + _data->size();
|
||
LostPair lost;
|
||
while (ptr < end) {
|
||
if ((*ptr) & 0x80) {
|
||
lost.first = loadUint32(ptr) & 0x7fffffff;
|
||
lost.second = loadUint32(ptr + 4) & 0x7fffffff;
|
||
lost.second += 1;
|
||
ptr += 8;
|
||
} else {
|
||
lost.first = loadUint32(ptr);
|
||
lost.second = lost.first + 1;
|
||
ptr += 4;
|
||
}
|
||
lost_list.push_back(lost);
|
||
}
|
||
return true;
|
||
}
|
||
bool NAKPacket::storeToData() {
|
||
control_type = NAK;
|
||
sub_type = 0;
|
||
size_t cif_size = getCIFSize(lost_list);
|
||
|
||
_data = BufferRaw::create();
|
||
_data->setCapacity(HEADER_SIZE + cif_size);
|
||
_data->setSize(HEADER_SIZE + cif_size);
|
||
|
||
storeToHeader();
|
||
|
||
uint8_t *ptr = (uint8_t *)_data->data() + HEADER_SIZE;
|
||
|
||
for (auto it : lost_list) {
|
||
if (it.first + 1 == it.second) {
|
||
storeUint32(ptr, it.first);
|
||
ptr[0] = ptr[0] & 0x7f;
|
||
ptr += 4;
|
||
} else {
|
||
storeUint32(ptr, it.first);
|
||
ptr[0] |= 0x80;
|
||
|
||
storeUint32(ptr + 4, it.second - 1);
|
||
// ptr[4] = ptr[4]&0x7f;
|
||
|
||
ptr += 8;
|
||
}
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
size_t NAKPacket::getCIFSize(std::list<LostPair> &lost) {
|
||
size_t size = 0;
|
||
for (auto it : lost) {
|
||
if (it.first + 1 == it.second) {
|
||
size += 4;
|
||
} else {
|
||
size += 8;
|
||
}
|
||
}
|
||
return size;
|
||
}
|
||
|
||
std::string NAKPacket::dump() {
|
||
_StrPrinter printer;
|
||
for (auto it : lost_list) {
|
||
printer << "[ " << it.first << " , " << it.second - 1 << " ]";
|
||
}
|
||
return std::move(printer);
|
||
}
|
||
|
||
bool MsgDropReqPacket::loadFromData(uint8_t *buf, size_t len) {
|
||
if (len < HEADER_SIZE + 8) {
|
||
WarnL << "data size" << len << " less " << HEADER_SIZE;
|
||
return false;
|
||
}
|
||
_data = BufferRaw::create();
|
||
_data->assign((char *)buf, len);
|
||
loadHeader();
|
||
|
||
uint8_t *ptr = (uint8_t *)_data->data() + HEADER_SIZE;
|
||
|
||
first_pkt_seq_num = loadUint32(ptr);
|
||
ptr += 4;
|
||
|
||
last_pkt_seq_num = loadUint32(ptr);
|
||
ptr += 4;
|
||
return true;
|
||
}
|
||
bool MsgDropReqPacket::storeToData() {
|
||
control_type = DROPREQ;
|
||
sub_type = 0;
|
||
_data = BufferRaw::create();
|
||
_data->setCapacity(HEADER_SIZE + 8);
|
||
_data->setSize(HEADER_SIZE + 8);
|
||
|
||
storeToHeader();
|
||
|
||
uint8_t *ptr = (uint8_t *)_data->data() + HEADER_SIZE;
|
||
|
||
storeUint32(ptr, first_pkt_seq_num);
|
||
ptr += 4;
|
||
|
||
storeUint32(ptr, last_pkt_seq_num);
|
||
ptr += 4;
|
||
return true;
|
||
}
|
||
} // namespace SRT
|