socketadapters.cc

本人收集整理的一份c/c++跨平台网络库

      Error(0);
      return;
    }
  } else if (state_ == PS_LEADER) {
    uint32 code;
    if (sscanf(data, "HTTP/%*lu.%*lu %lu", &code) != 1) {
      Error(0);
      return;
    }
    switch (code) {
    case 200:
      // connection good!
      state_ = PS_TUNNEL_HEADERS;
      return;
#if defined(HTTP_STATUS_PROXY_AUTH_REQ) && (HTTP_STATUS_PROXY_AUTH_REQ != 407)
#error Wrong code for HTTP_STATUS_PROXY_AUTH_REQ
#endif
    case 407: // HTTP_STATUS_PROXY_AUTH_REQ
      state_ = PS_AUTHENTICATE;
      return;
    default:
      defer_error_ = 0;
      state_ = PS_ERROR_HEADERS;
      return;
    }
  } else if ((state_ == PS_AUTHENTICATE)
             && (_strnicmp(data, "Proxy-Authenticate:", 19) == 0)) {
    std::string response, auth_method;
    switch (HttpAuthenticate(data + 19, len - 19,
                             proxy_, "CONNECT", "/",
                             user_, pass_, context_, response, auth_method)) {
    case HAR_IGNORE:
      LOG(LS_VERBOSE) << "Ignoring Proxy-Authenticate: " << auth_method;
      if (!unknown_mechanisms_.empty())
        unknown_mechanisms_.append(", ");
      unknown_mechanisms_.append(auth_method);
      break;
    case HAR_RESPONSE:
      headers_ = "Proxy-Authorization: ";
      headers_.append(response);
      headers_.append("\r\n");
      state_ = PS_SKIP_HEADERS;
      unknown_mechanisms_.clear();
      break;
    case HAR_CREDENTIALS:
      defer_error_ = SOCKET_EACCES;
      state_ = PS_ERROR_HEADERS;
      unknown_mechanisms_.clear();
      break;
    case HAR_ERROR:
      defer_error_ = 0;
      state_ = PS_ERROR_HEADERS;
      unknown_mechanisms_.clear();
      break;
    }
  } else if (_strnicmp(data, "Content-Length:", 15) == 0) {
    content_length_ = strtoul(data + 15, 0, 0);
  } else if (_strnicmp(data, "Proxy-Connection: Keep-Alive", 28) == 0) {
    expect_close_ = false;
    /*
  } else if (_strnicmp(data, "Connection: close", 17) == 0) {
    expect_close_ = true;
    */
  }
}

void AsyncHttpsProxySocket::EndResponse() {
  if (!expect_close_) {
    SendRequest();
    return;
  }

  // No point in waiting for the server to close... let's close now
  // TODO: Refactor out PS_WAIT_CLOSE
  state_ = PS_WAIT_CLOSE;
  BufferedReadAdapter::Close();
  OnCloseEvent(this, 0);
}

void AsyncHttpsProxySocket::Error(int error) {
  BufferInput(false);
  Close();
  SetError(error);
  SignalCloseEvent(this, error);
}

///////////////////////////////////////////////////////////////////////////////

AsyncSocksProxySocket::AsyncSocksProxySocket(AsyncSocket* socket, const SocketAddress& proxy,
                                   const std::string& username, const CryptString& password)
  : BufferedReadAdapter(socket, 1024), proxy_(proxy), user_(username), pass_(password),
    state_(SS_ERROR) {
}

int AsyncSocksProxySocket::Connect(const SocketAddress& addr) {
  dest_ = addr;
  BufferInput(true);
  return BufferedReadAdapter::Connect(proxy_);
}

SocketAddress AsyncSocksProxySocket::GetRemoteAddress() const {
  return dest_;
}

void AsyncSocksProxySocket::OnConnectEvent(AsyncSocket * socket) {
  SendHello();
}

void AsyncSocksProxySocket::ProcessInput(char * data, size_t& len) {
  ASSERT(state_ < SS_TUNNEL);

  ByteBuffer response(data, len);

  if (state_ == SS_HELLO) {
    uint8 ver, method;
    if (!response.ReadUInt8(ver) ||
        !response.ReadUInt8(method))
      return;

    if (ver != 5) {
      Error(0);
      return;
    }

    if (method == 0) {
      SendConnect();
    } else if (method == 2) {
      SendAuth();
    } else {
      Error(0);
      return;
    }
  } else if (state_ == SS_AUTH) {
    uint8 ver, status;
    if (!response.ReadUInt8(ver) ||
        !response.ReadUInt8(status))
      return;

    if ((ver != 1) || (status != 0)) {
      Error(SOCKET_EACCES);
      return;
    }

    SendConnect();
  } else if (state_ == SS_CONNECT) {
    uint8 ver, rep, rsv, atyp;
    if (!response.ReadUInt8(ver) ||
        !response.ReadUInt8(rep) ||
        !response.ReadUInt8(rsv) ||
        !response.ReadUInt8(atyp))
      return;

    if ((ver != 5) || (rep != 0)) {
      Error(0);
      return;
    }

    uint16 port;
    if (atyp == 1) {
      uint32 addr;
      if (!response.ReadUInt32(addr) ||
          !response.ReadUInt16(port))
        return;
      LOG(LS_VERBOSE) << "Bound on " << addr << ":" << port;
    } else if (atyp == 3) {
      uint8 len;
      std::string addr;
      if (!response.ReadUInt8(len) ||
          !response.ReadString(addr, len) ||
          !response.ReadUInt16(port))
        return;
      LOG(LS_VERBOSE) << "Bound on " << addr << ":" << port;
    } else if (atyp == 4) {
      std::string addr;
      if (!response.ReadString(addr, 16) ||
          !response.ReadUInt16(port))
        return;
      LOG(LS_VERBOSE) << "Bound on <IPV6>:" << port;
    } else {
      Error(0);
      return;
    }

    state_ = SS_TUNNEL;
  }

  // Consume parsed data
  len = response.Length();
  memcpy(data, response.Data(), len);

  if (state_ != SS_TUNNEL)
    return;

  bool remainder = (len > 0);
  BufferInput(false);
  SignalConnectEvent(this);

  // FIX: if SignalConnect causes the socket to be destroyed, we are in trouble
  if (remainder)
    SignalReadEvent(this); // TODO: signal this??
}

void AsyncSocksProxySocket::SendHello() {
  ByteBuffer request;
  request.WriteUInt8(5);   // Socks Version
  if (user_.empty()) {
    request.WriteUInt8(1); // Authentication Mechanisms
    request.WriteUInt8(0); // No authentication
  } else {
    request.WriteUInt8(2); // Authentication Mechanisms
    request.WriteUInt8(0); // No authentication
    request.WriteUInt8(2); // Username/Password
  }
  DirectSend(request.Data(), request.Length());
  state_ = SS_HELLO;
}

void AsyncSocksProxySocket::SendAuth() {
  ByteBuffer request;
  request.WriteUInt8(1);      // Negotiation Version
  request.WriteUInt8(static_cast<uint8>(user_.size()));
  request.WriteString(user_); // Username
  request.WriteUInt8(static_cast<uint8>(pass_.GetLength()));
  size_t len = pass_.GetLength() + 1;
  char * sensitive = new char[len];
  pass_.CopyTo(sensitive, true);
  request.WriteString(sensitive); // Password
  memset(sensitive, 0, len);
  delete [] sensitive;
  DirectSend(request.Data(), request.Length());
  state_ = SS_AUTH;
}

void AsyncSocksProxySocket::SendConnect() {
  ByteBuffer request;
  request.WriteUInt8(5);             // Socks Version
  request.WriteUInt8(1);             // CONNECT
  request.WriteUInt8(0);             // Reserved
  if (dest_.IsUnresolved()) {
    std::string hostname = dest_.IPAsString();
    request.WriteUInt8(3);           // DOMAINNAME
    request.WriteUInt8(static_cast<uint8>(hostname.size()));
    request.WriteString(hostname);   // Destination Hostname
  } else {
    request.WriteUInt8(1);           // IPV4
    request.WriteUInt32(dest_.ip()); // Destination IP
  }
  request.WriteUInt16(dest_.port()); // Destination Port
  DirectSend(request.Data(), request.Length());
  state_ = SS_CONNECT;
}

void AsyncSocksProxySocket::Error(int error) {
  state_ = SS_ERROR;
  BufferInput(false);
  Close();
  SetError(SOCKET_EACCES);
  SignalCloseEvent(this, error);
}

///////////////////////////////////////////////////////////////////////////////

LoggingSocketAdapter::LoggingSocketAdapter(AsyncSocket* socket,
                                           LoggingSeverity level,
                                           const char * label, bool hex_mode)
: AsyncSocketAdapter(socket), level_(level), hex_mode_(hex_mode)
{
  label_.append("[");
  label_.append(label);
  label_.append("]");
}

int
LoggingSocketAdapter::Send(const void *pv, size_t cb) {
  int res = AsyncSocketAdapter::Send(pv, cb);
  if (res > 0)
    LogMultiline(level_, label_.c_str(), false,
                 static_cast<const char *>(pv), res, hex_mode_, &lms_);
  return res;
}

int
LoggingSocketAdapter::SendTo(const void *pv, size_t cb,
                             const SocketAddress& addr) {
  int res = AsyncSocketAdapter::SendTo(pv, cb, addr);
  if (res > 0)
    LogMultiline(level_, label_.c_str(), false,
                 static_cast<const char *>(pv), res, hex_mode_, &lms_);
  return res;
}

int
LoggingSocketAdapter::Recv(void *pv, size_t cb) {
  int res = AsyncSocketAdapter::Recv(pv, cb);
  if (res > 0)
    LogMultiline(level_, label_.c_str(), true,
                 static_cast<const char *>(pv), res, hex_mode_, &lms_);
  return res;
}

int
LoggingSocketAdapter::RecvFrom(void *pv, size_t cb, SocketAddress *paddr) {
  int res = AsyncSocketAdapter::RecvFrom(pv, cb, paddr);
  if (res > 0)
    LogMultiline(level_, label_.c_str(), true,
                 static_cast<const char *>(pv), res, hex_mode_, &lms_);
  return res;
}

void
LoggingSocketAdapter::OnConnectEvent(AsyncSocket * socket) {
  LOG_V(level_) << label_ << " Connected";
  AsyncSocketAdapter::OnConnectEvent(socket);
}

void
LoggingSocketAdapter::OnCloseEvent(AsyncSocket * socket, int err) {
  LOG_V(level_) << label_ << " Closed with error: " << err;
  AsyncSocketAdapter::OnCloseEvent(socket, err);
}

///////////////////////////////////////////////////////////////////////////////

} // namespace talk_base