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WebSocketFrame.h
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#pragma once
#include <FlowUtils/FlowRandom.h>
#include <vector>
#include <bitset>
struct WebSocketFrame {
bool fin = 1;
bool rsv1 = 0;
bool rsv2 = 0;
bool rsv3 = 0;
int8_t opcode = 1;
bool mask = 0;
uint64_t payload_len;
unsigned char masking_key[4];
std::vector<unsigned char> payload_data;
std::vector<unsigned char> createData() {
std::vector<unsigned char> rtn;
unsigned char firstByte = fin;
firstByte <<= 1;
firstByte += rsv1;
firstByte <<= 1;
firstByte += rsv2;
firstByte <<= 1;
firstByte += rsv3;
firstByte <<= 4;
firstByte += opcode;
rtn.emplace_back(firstByte);
unsigned char secondByte = mask;
secondByte <<= 7;
payload_len = payload_data.size();
if (payload_len < 126) {
secondByte += payload_len;
rtn.emplace_back(secondByte);
} else if (payload_len < 65536) {
secondByte += 126;
rtn.emplace_back(secondByte);
rtn.emplace_back(reinterpret_cast<char *>(&payload_len)[1]);
rtn.emplace_back(reinterpret_cast<char *>(&payload_len)[0]);
} else {
secondByte += 127;
rtn.emplace_back(secondByte);
rtn.emplace_back(reinterpret_cast<char *>(&payload_len)[7]);
rtn.emplace_back(reinterpret_cast<char *>(&payload_len)[6]);
rtn.emplace_back(reinterpret_cast<char *>(&payload_len)[5]);
rtn.emplace_back(reinterpret_cast<char *>(&payload_len)[4]);
rtn.emplace_back(reinterpret_cast<char *>(&payload_len)[3]);
rtn.emplace_back(reinterpret_cast<char *>(&payload_len)[2]);
rtn.emplace_back(reinterpret_cast<char *>(&payload_len)[1]);
rtn.emplace_back(reinterpret_cast<char *>(&payload_len)[0]);
}
if (mask) {
rtn.emplace_back(masking_key[0]);
rtn.emplace_back(masking_key[1]);
rtn.emplace_back(masking_key[2]);
rtn.emplace_back(masking_key[3]);
}
rtn.insert(rtn.end(), payload_data.begin(), payload_data.end());
return rtn;
}
bool isConnectionClosed() const {
return this->opcode == 0x08;
}
uint16_t getConnectClosedCode() const {
if (!isConnectionClosed())
return 0;
uint16_t rtn = payload_data[0];
rtn <<= 8;
rtn += payload_data[1];
return rtn;
}
static WebSocketFrame readMessage(const std::vector<unsigned char> &buffer, size_t &buffer_pos) {
WebSocketFrame frame;
if (buffer.empty()) {
LOG_WARNING << "Empty message!";
return frame;
}
std::bitset<8> bs(buffer.at(buffer_pos++));
frame.fin = bs[7];
frame.rsv1 = bs[6];
frame.rsv2 = bs[5];
frame.rsv3 = bs[4];
frame.opcode = bs[3] * 8 + bs[2] * 4 + bs[1] * 2 + bs[0] * 1;
bs = std::bitset<8>(buffer.at(buffer_pos++));
frame.mask = bs[7];
// frame.payload_len = bs[6] * 64 + bs[5] * 32 + bs[4] * 16 + bs[3] * 8 + bs[2] * 4 + bs[1] * 2 + bs[0] * 1;
frame.payload_len = 0b01111111 & buffer.at(buffer_pos - 1);
if (frame.payload_len == 126) {
frame.payload_len = buffer.at(buffer_pos++);
frame.payload_len <<= 8;
frame.payload_len += buffer.at(buffer_pos++);
}
if (frame.payload_len == 127) {
frame.payload_len = buffer.at(buffer_pos++);
frame.payload_len <<= 8;
frame.payload_len += buffer.at(buffer_pos++);
frame.payload_len <<= 8;
frame.payload_len += buffer.at(buffer_pos++);
frame.payload_len <<= 8;
frame.payload_len += buffer.at(buffer_pos++);
frame.payload_len <<= 8;
frame.payload_len += buffer.at(buffer_pos++);
frame.payload_len <<= 8;
frame.payload_len += buffer.at(buffer_pos++);
frame.payload_len <<= 8;
frame.payload_len += buffer.at(buffer_pos++);
frame.payload_len <<= 8;
frame.payload_len += buffer.at(buffer_pos++);
}
if (frame.mask) {
frame.masking_key[0] = buffer.at(buffer_pos++);
frame.masking_key[1] = buffer.at(buffer_pos++);
frame.masking_key[2] = buffer.at(buffer_pos++);
frame.masking_key[3] = buffer.at(buffer_pos++);
}
// frame.payload_data.insert(frame.payload_data.begin(), buffer.begin() + buffer_pos, buffer.begin() + buffer_pos + frame.payload_len);
frame.payload_data.assign(buffer.begin() + buffer_pos, buffer.begin() + buffer_pos + frame.payload_len);
if (frame.mask) {
frame.xorPayload();
}
buffer_pos += frame.payload_len;
return frame;
}
std::vector<unsigned char> createMaskedData() {
maskFrame();
return createData();
}
void maskFrame() {
if (this->mask)
return;
this->mask = true;
this->masking_key[0] = FlowRandom::randomChar();
this->masking_key[1] = FlowRandom::randomChar();
this->masking_key[2] = FlowRandom::randomChar();
this->masking_key[3] = FlowRandom::randomChar();
xorPayload();
}
void xorPayload() {
for (size_t i = 0; i < this->payload_data.size(); ++i) {
this->payload_data[i] = this->payload_data[i] ^ this->masking_key[i % 4];
}
}
};