Repo created

TMessagesProj/jni/voip/webrtc/rtc_base/socket_adapters.cc

@@ -0,0 +1,472 @@
+/*
+ *  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/http_common.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);
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+AsyncHttpsProxySocket::AsyncHttpsProxySocket(Socket* socket,
+                                             absl::string_view user_agent,
+                                             const SocketAddress& proxy,
+                                             absl::string_view username,
+                                             const CryptString& password)
+    : BufferedReadAdapter(socket, 1024),
+      proxy_(proxy),
+      agent_(user_agent),
+      user_(username),
+      pass_(password),
+      force_connect_(false),
+      state_(PS_ERROR),
+      context_(0) {}
+
+AsyncHttpsProxySocket::~AsyncHttpsProxySocket() {
+  delete context_;
+}
+
+int AsyncHttpsProxySocket::Connect(const SocketAddress& addr) {
+  int ret;
+  RTC_LOG(LS_VERBOSE) << "AsyncHttpsProxySocket::Connect("
+                      << proxy_.ToSensitiveString() << ")";
+  dest_ = addr;
+  state_ = PS_INIT;
+  if (ShouldIssueConnect()) {
+    BufferInput(true);
+  }
+  ret = BufferedReadAdapter::Connect(proxy_);
+  // TODO: Set state_ appropriately if Connect fails.
+  return ret;
+}
+
+SocketAddress AsyncHttpsProxySocket::GetRemoteAddress() const {
+  return dest_;
+}
+
+int AsyncHttpsProxySocket::Close() {
+  headers_.clear();
+  state_ = PS_ERROR;
+  dest_.Clear();
+  delete context_;
+  context_ = nullptr;
+  return BufferedReadAdapter::Close();
+}
+
+Socket::ConnState AsyncHttpsProxySocket::GetState() const {
+  if (state_ < PS_TUNNEL) {
+    return CS_CONNECTING;
+  } else if (state_ == PS_TUNNEL) {
+    return CS_CONNECTED;
+  } else {
+    return CS_CLOSED;
+  }
+}
+
+void AsyncHttpsProxySocket::OnConnectEvent(Socket* socket) {
+  RTC_LOG(LS_VERBOSE) << "AsyncHttpsProxySocket::OnConnectEvent";
+  if (!ShouldIssueConnect()) {
+    state_ = PS_TUNNEL;
+    BufferedReadAdapter::OnConnectEvent(socket);
+    return;
+  }
+  SendRequest();
+}
+
+void AsyncHttpsProxySocket::OnCloseEvent(Socket* socket, int err) {
+  RTC_LOG(LS_VERBOSE) << "AsyncHttpsProxySocket::OnCloseEvent(" << err << ")";
+  if ((state_ == PS_WAIT_CLOSE) && (err == 0)) {
+    state_ = PS_ERROR;
+    Connect(dest_);
+  } else {
+    BufferedReadAdapter::OnCloseEvent(socket, err);
+  }
+}
+
+void AsyncHttpsProxySocket::ProcessInput(char* data, size_t* len) {
+  size_t start = 0;
+  for (size_t pos = start; state_ < PS_TUNNEL && pos < *len;) {
+    if (state_ == PS_SKIP_BODY) {
+      size_t consume = std::min(*len - pos, content_length_);
+      pos += consume;
+      start = pos;
+      content_length_ -= consume;
+      if (content_length_ == 0) {
+        EndResponse();
+      }
+      continue;
+    }
+
+    if (data[pos++] != '\n')
+      continue;
+
+    size_t length = pos - start - 1;
+    if ((length > 0) && (data[start + length - 1] == '\r'))
+      --length;
+
+    data[start + length] = 0;
+    ProcessLine(data + start, length);
+    start = pos;
+  }
+
+  *len -= start;
+  if (*len > 0) {
+    memmove(data, data + start, *len);
+  }
+
+  if (state_ != PS_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??
+}
+
+bool AsyncHttpsProxySocket::ShouldIssueConnect() const {
+  // TODO: Think about whether a more sophisticated test
+  // than dest port == 80 is needed.
+  return force_connect_ || (dest_.port() != 80);
+}
+
+void AsyncHttpsProxySocket::SendRequest() {
+  rtc::StringBuilder ss;
+  ss << "CONNECT " << dest_.ToString() << " HTTP/1.0\r\n";
+  ss << "User-Agent: " << agent_ << "\r\n";
+  ss << "Host: " << dest_.HostAsURIString() << "\r\n";
+  ss << "Content-Length: 0\r\n";
+  ss << "Proxy-Connection: Keep-Alive\r\n";
+  ss << headers_;
+  ss << "\r\n";
+  std::string str = ss.str();
+  DirectSend(str.c_str(), str.size());
+  state_ = PS_LEADER;
+  expect_close_ = true;
+  content_length_ = 0;
+  headers_.clear();
+
+  RTC_LOG(LS_VERBOSE) << "AsyncHttpsProxySocket >> " << str;
+}
+
+void AsyncHttpsProxySocket::ProcessLine(char* data, size_t len) {
+  RTC_LOG(LS_VERBOSE) << "AsyncHttpsProxySocket << " << data;
+
+  if (len == 0) {
+    if (state_ == PS_TUNNEL_HEADERS) {
+      state_ = PS_TUNNEL;
+    } else if (state_ == PS_ERROR_HEADERS) {
+      Error(defer_error_);
+      return;
+    } else if (state_ == PS_SKIP_HEADERS) {
+      if (content_length_) {
+        state_ = PS_SKIP_BODY;
+      } else {
+        EndResponse();
+        return;
+      }
+    } else {
+      if (!unknown_mechanisms_.empty()) {
+        RTC_LOG(LS_ERROR) << "Unsupported authentication methods: "
+                          << unknown_mechanisms_;
+      }
+      // Unexpected end of headers
+      Error(0);
+      return;
+    }
+  } else if (state_ == PS_LEADER) {
+    unsigned int code;
+    if (sscanf(data, "HTTP/%*u.%*u %u", &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) &&
+             absl::StartsWithIgnoreCase(data, "Proxy-Authenticate:")) {
+    std::string response, auth_method;
+    switch (HttpAuthenticate(absl::string_view(data + 19, len - 19), proxy_,
+                             "CONNECT", "/", user_, pass_, context_, response,
+                             auth_method)) {
+      case HAR_IGNORE:
+        RTC_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 (absl::StartsWithIgnoreCase(data, "Content-Length:")) {
+    content_length_ = strtoul(data + 15, 0, 0);
+  } else if (absl::StartsWithIgnoreCase(data, "Proxy-Connection: Keep-Alive")) {
+    expect_close_ = false;
+    /*
+  } else if (absl::StartsWithIgnoreCase(data, "Connection: close") {
+    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);
+}
+
+}  // namespace rtc