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/*
* Copyright 2004 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 "rtc_base/server_socket_adapters.h"
#include <string>
#include "rtc_base/byte_buffer.h"
namespace rtc {
AsyncProxyServerSocket::AsyncProxyServerSocket(Socket* socket,
size_t buffer_size)
: BufferedReadAdapter(socket, buffer_size) {}
AsyncProxyServerSocket::~AsyncProxyServerSocket() = default;
AsyncSSLServerSocket::AsyncSSLServerSocket(Socket* socket)
: BufferedReadAdapter(socket, 1024) {
BufferInput(true);
}
void AsyncSSLServerSocket::ProcessInput(char* data, size_t* len) {
// We only accept client hello messages.
const ArrayView<const uint8_t> client_hello =
AsyncSSLSocket::SslClientHello();
if (*len < client_hello.size()) {
return;
}
if (memcmp(client_hello.data(), data, client_hello.size()) != 0) {
Close();
SignalCloseEvent(this, 0);
return;
}
*len -= client_hello.size();
// Clients should not send more data until the handshake is completed.
RTC_DCHECK(*len == 0);
const ArrayView<const uint8_t> server_hello =
AsyncSSLSocket::SslServerHello();
// Send a server hello back to the client.
DirectSend(server_hello.data(), server_hello.size());
// Handshake completed for us, redirect input to our parent.
BufferInput(false);
}
AsyncSocksProxyServerSocket::AsyncSocksProxyServerSocket(Socket* socket)
: AsyncProxyServerSocket(socket, kBufferSize), state_(SS_HELLO) {
BufferInput(true);
}
void AsyncSocksProxyServerSocket::ProcessInput(char* data, size_t* len) {
RTC_DCHECK(state_ < SS_CONNECT_PENDING);
ByteBufferReader response(
rtc::MakeArrayView(reinterpret_cast<const uint8_t*>(data), *len));
if (state_ == SS_HELLO) {
HandleHello(&response);
} else if (state_ == SS_AUTH) {
HandleAuth(&response);
} else if (state_ == SS_CONNECT) {
HandleConnect(&response);
}
// Consume parsed data
*len = response.Length();
if (response.Length() > 0) {
memmove(data, response.DataView().data(), *len);
}
}
void AsyncSocksProxyServerSocket::DirectSend(const ByteBufferWriter& buf) {
BufferedReadAdapter::DirectSend(buf.Data(), buf.Length());
}
void AsyncSocksProxyServerSocket::HandleHello(ByteBufferReader* request) {
uint8_t ver, num_methods;
if (!request->ReadUInt8(&ver) || !request->ReadUInt8(&num_methods)) {
Error(0);
return;
}
if (ver != 5) {
Error(0);
return;
}
// Handle either no-auth (0) or user/pass auth (2)
uint8_t method = 0xFF;
if (num_methods > 0 && !request->ReadUInt8(&method)) {
Error(0);
return;
}
SendHelloReply(method);
if (method == 0) {
state_ = SS_CONNECT;
} else if (method == 2) {
state_ = SS_AUTH;
} else {
state_ = SS_ERROR;
}
}
void AsyncSocksProxyServerSocket::SendHelloReply(uint8_t method) {
ByteBufferWriter response;
response.WriteUInt8(5); // Socks Version
response.WriteUInt8(method); // Auth method
DirectSend(response);
}
void AsyncSocksProxyServerSocket::HandleAuth(ByteBufferReader* request) {
uint8_t ver, user_len, pass_len;
std::string user, pass;
if (!request->ReadUInt8(&ver) || !request->ReadUInt8(&user_len) ||
!request->ReadString(&user, user_len) || !request->ReadUInt8(&pass_len) ||
!request->ReadString(&pass, pass_len)) {
Error(0);
return;
}
SendAuthReply(0);
state_ = SS_CONNECT;
}
void AsyncSocksProxyServerSocket::SendAuthReply(uint8_t result) {
ByteBufferWriter response;
response.WriteUInt8(1); // Negotiation Version
response.WriteUInt8(result);
DirectSend(response);
}
void AsyncSocksProxyServerSocket::HandleConnect(ByteBufferReader* request) {
uint8_t ver, command, reserved, addr_type;
uint32_t ip;
uint16_t port;
if (!request->ReadUInt8(&ver) || !request->ReadUInt8(&command) ||
!request->ReadUInt8(&reserved) || !request->ReadUInt8(&addr_type) ||
!request->ReadUInt32(&ip) || !request->ReadUInt16(&port)) {
Error(0);
return;
}
if (ver != 5 || command != 1 || reserved != 0 || addr_type != 1) {
Error(0);
return;
}
SignalConnectRequest(this, SocketAddress(ip, port));
state_ = SS_CONNECT_PENDING;
}
void AsyncSocksProxyServerSocket::SendConnectResult(int result,
const SocketAddress& addr) {
if (state_ != SS_CONNECT_PENDING)
return;
ByteBufferWriter response;
response.WriteUInt8(5); // Socks version
response.WriteUInt8((result != 0)); // 0x01 is generic error
response.WriteUInt8(0); // reserved
response.WriteUInt8(1); // IPv4 address
response.WriteUInt32(addr.ip());
response.WriteUInt16(addr.port());
DirectSend(response);
BufferInput(false);
state_ = SS_TUNNEL;
}
void AsyncSocksProxyServerSocket::Error(int error) {
state_ = SS_ERROR;
BufferInput(false);
Close();
SetError(SOCKET_EACCES);
SignalCloseEvent(this, error);
}
} // namespace rtc
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