| /* |
| * 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. |
| */ |
| |
| #if defined(_MSC_VER) && _MSC_VER < 1300 |
| #pragma warning(disable : 4786) |
| #endif |
| |
| #include "rtc_base/socket_adapters.h" |
| |
| #include <algorithm> |
| |
| #include "absl/strings/match.h" |
| #include "absl/strings/string_view.h" |
| #include "rtc_base/buffer.h" |
| #include "rtc_base/byte_buffer.h" |
| #include "rtc_base/checks.h" |
| #include "rtc_base/logging.h" |
| #include "rtc_base/strings/string_builder.h" |
| #include "rtc_base/zero_memory.h" |
| |
| namespace rtc { |
| |
| BufferedReadAdapter::BufferedReadAdapter(Socket* socket, size_t size) |
| : AsyncSocketAdapter(socket), |
| buffer_size_(size), |
| data_len_(0), |
| buffering_(false) { |
| buffer_ = new char[buffer_size_]; |
| } |
| |
| BufferedReadAdapter::~BufferedReadAdapter() { |
| delete[] buffer_; |
| } |
| |
| int BufferedReadAdapter::Send(const void* pv, size_t cb) { |
| if (buffering_) { |
| // TODO: Spoof error better; Signal Writeable |
| SetError(EWOULDBLOCK); |
| return -1; |
| } |
| return AsyncSocketAdapter::Send(pv, cb); |
| } |
| |
| int BufferedReadAdapter::Recv(void* pv, size_t cb, int64_t* timestamp) { |
| if (buffering_) { |
| SetError(EWOULDBLOCK); |
| return -1; |
| } |
| |
| size_t read = 0; |
| |
| if (data_len_) { |
| read = std::min(cb, data_len_); |
| memcpy(pv, buffer_, read); |
| data_len_ -= read; |
| if (data_len_ > 0) { |
| memmove(buffer_, buffer_ + read, data_len_); |
| } |
| pv = static_cast<char*>(pv) + read; |
| cb -= read; |
| } |
| |
| // FIX: If cb == 0, we won't generate another read event |
| |
| int res = AsyncSocketAdapter::Recv(pv, cb, timestamp); |
| if (res >= 0) { |
| // Read from socket and possibly buffer; return combined length |
| return res + static_cast<int>(read); |
| } |
| |
| if (read > 0) { |
| // Failed to read from socket, but still read something from buffer |
| return static_cast<int>(read); |
| } |
| |
| // Didn't read anything; return error from socket |
| return res; |
| } |
| |
| void BufferedReadAdapter::BufferInput(bool on) { |
| buffering_ = on; |
| } |
| |
| void BufferedReadAdapter::OnReadEvent(Socket* socket) { |
| RTC_DCHECK(socket == GetSocket()); |
| |
| if (!buffering_) { |
| AsyncSocketAdapter::OnReadEvent(socket); |
| return; |
| } |
| |
| if (data_len_ >= buffer_size_) { |
| RTC_LOG(LS_ERROR) << "Input buffer overflow"; |
| RTC_DCHECK_NOTREACHED(); |
| data_len_ = 0; |
| } |
| |
| int len = AsyncSocketAdapter::Recv(buffer_ + data_len_, |
| buffer_size_ - data_len_, nullptr); |
| if (len < 0) { |
| // TODO: Do something better like forwarding the error to the user. |
| RTC_LOG_ERR(LS_INFO) << "Recv"; |
| return; |
| } |
| |
| data_len_ += len; |
| |
| ProcessInput(buffer_, &data_len_); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| // This is a SSL v2 CLIENT_HELLO message. |
| // TODO: Should this have a session id? The response doesn't have a |
| // certificate, so the hello should have a session id. |
| static const uint8_t kSslClientHello[] = { |
| 0x80, 0x46, // msg len |
| 0x01, // CLIENT_HELLO |
| 0x03, 0x01, // SSL 3.1 |
| 0x00, 0x2d, // ciphersuite len |
| 0x00, 0x00, // session id len |
| 0x00, 0x10, // challenge len |
| 0x01, 0x00, 0x80, 0x03, 0x00, 0x80, 0x07, 0x00, 0xc0, // ciphersuites |
| 0x06, 0x00, 0x40, 0x02, 0x00, 0x80, 0x04, 0x00, 0x80, // |
| 0x00, 0x00, 0x04, 0x00, 0xfe, 0xff, 0x00, 0x00, 0x0a, // |
| 0x00, 0xfe, 0xfe, 0x00, 0x00, 0x09, 0x00, 0x00, 0x64, // |
| 0x00, 0x00, 0x62, 0x00, 0x00, 0x03, 0x00, 0x00, 0x06, // |
| 0x1f, 0x17, 0x0c, 0xa6, 0x2f, 0x00, 0x78, 0xfc, // challenge |
| 0x46, 0x55, 0x2e, 0xb1, 0x83, 0x39, 0xf1, 0xea // |
| }; |
| |
| // static |
| ArrayView<const uint8_t> AsyncSSLSocket::SslClientHello() { |
| // Implicit conversion directly from kSslClientHello to ArrayView fails when |
| // built with gcc. |
| return {kSslClientHello, sizeof(kSslClientHello)}; |
| } |
| |
| // This is a TLSv1 SERVER_HELLO message. |
| static const uint8_t kSslServerHello[] = { |
| 0x16, // handshake message |
| 0x03, 0x01, // SSL 3.1 |
| 0x00, 0x4a, // message len |
| 0x02, // SERVER_HELLO |
| 0x00, 0x00, 0x46, // handshake len |
| 0x03, 0x01, // SSL 3.1 |
| 0x42, 0x85, 0x45, 0xa7, 0x27, 0xa9, 0x5d, 0xa0, // server random |
| 0xb3, 0xc5, 0xe7, 0x53, 0xda, 0x48, 0x2b, 0x3f, // |
| 0xc6, 0x5a, 0xca, 0x89, 0xc1, 0x58, 0x52, 0xa1, // |
| 0x78, 0x3c, 0x5b, 0x17, 0x46, 0x00, 0x85, 0x3f, // |
| 0x20, // session id len |
| 0x0e, 0xd3, 0x06, 0x72, 0x5b, 0x5b, 0x1b, 0x5f, // session id |
| 0x15, 0xac, 0x13, 0xf9, 0x88, 0x53, 0x9d, 0x9b, // |
| 0xe8, 0x3d, 0x7b, 0x0c, 0x30, 0x32, 0x6e, 0x38, // |
| 0x4d, 0xa2, 0x75, 0x57, 0x41, 0x6c, 0x34, 0x5c, // |
| 0x00, 0x04, // RSA/RC4-128/MD5 |
| 0x00 // null compression |
| }; |
| |
| // static |
| ArrayView<const uint8_t> AsyncSSLSocket::SslServerHello() { |
| return {kSslServerHello, sizeof(kSslServerHello)}; |
| } |
| |
| AsyncSSLSocket::AsyncSSLSocket(Socket* socket) |
| : BufferedReadAdapter(socket, 1024) {} |
| |
| int AsyncSSLSocket::Connect(const SocketAddress& addr) { |
| // Begin buffering before we connect, so that there isn't a race condition |
| // between potential senders and receiving the OnConnectEvent signal |
| BufferInput(true); |
| return BufferedReadAdapter::Connect(addr); |
| } |
| |
| void AsyncSSLSocket::OnConnectEvent(Socket* socket) { |
| RTC_DCHECK(socket == GetSocket()); |
| // TODO: we could buffer output too... |
| const int res = DirectSend(kSslClientHello, sizeof(kSslClientHello)); |
| if (res != sizeof(kSslClientHello)) { |
| RTC_LOG(LS_ERROR) << "Sending fake SSL ClientHello message failed."; |
| Close(); |
| SignalCloseEvent(this, 0); |
| } |
| } |
| |
| void AsyncSSLSocket::ProcessInput(char* data, size_t* len) { |
| if (*len < sizeof(kSslServerHello)) |
| return; |
| |
| if (memcmp(kSslServerHello, data, sizeof(kSslServerHello)) != 0) { |
| RTC_LOG(LS_ERROR) << "Received non-matching fake SSL ServerHello message."; |
| Close(); |
| SignalCloseEvent(this, 0); // TODO: error code? |
| return; |
| } |
| |
| *len -= sizeof(kSslServerHello); |
| if (*len > 0) { |
| memmove(data, data + sizeof(kSslServerHello), *len); |
| } |
| |
| 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); |
| } |
| |
| } // namespace rtc |
