Adds a modified copy of talk/base to webrtc/base. It is the first step in migrating talk/base to webrtc/base.

BUG=N/A R=andrew@webrtc.org, wu@webrtc.org Review URL: https://webrtc-codereview.appspot.com/12199004 git-svn-id: http://webrtc.googlecode.com/svn/trunk@6107 4adac7df-926f-26a2-2b94-8c16560cd09d
2014-05-12 18:03:09 +00:00
parent f3a5e6afc4
commit 2c7d1b39b9
386 changed files with 84973 additions and 6 deletions
--- a/webrtc/base/socketadapters.cc
+++ b/webrtc/base/socketadapters.cc
@ -0,0 +1,893 @@
+/*
+ *  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 <time.h>
+#include <errno.h>
+
+#if defined(WEBRTC_WIN)
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+#include <winsock2.h>
+#include <ws2tcpip.h>
+#define SECURITY_WIN32
+#include <security.h>
+#endif
+
+#include "webrtc/base/bytebuffer.h"
+#include "webrtc/base/common.h"
+#include "webrtc/base/httpcommon.h"
+#include "webrtc/base/logging.h"
+#include "webrtc/base/socketadapters.h"
+#include "webrtc/base/stringencode.h"
+#include "webrtc/base/stringutils.h"
+
+#if defined(WEBRTC_WIN)
+#include "webrtc/base/sec_buffer.h"
+#endif  // WEBRTC_WIN 
+
+namespace rtc {
+
+BufferedReadAdapter::BufferedReadAdapter(AsyncSocket* 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
+    socket_->SetError(EWOULDBLOCK);
+    return -1;
+  }
+  return AsyncSocketAdapter::Send(pv, cb);
+}
+
+int BufferedReadAdapter::Recv(void *pv, size_t cb) {
+  if (buffering_) {
+    socket_->SetError(EWOULDBLOCK);
+    return -1;
+  }
+
+  size_t read = 0;
+
+  if (data_len_) {
+    read = _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);
+  if (res < 0)
+    return res;
+
+  return res + static_cast<int>(read);
+}
+
+void BufferedReadAdapter::BufferInput(bool on) {
+  buffering_ = on;
+}
+
+void BufferedReadAdapter::OnReadEvent(AsyncSocket * socket) {
+  ASSERT(socket == socket_);
+
+  if (!buffering_) {
+    AsyncSocketAdapter::OnReadEvent(socket);
+    return;
+  }
+
+  if (data_len_ >= buffer_size_) {
+    LOG(INFO) << "Input buffer overflow";
+    ASSERT(false);
+    data_len_ = 0;
+  }
+
+  int len = socket_->Recv(buffer_ + data_len_, buffer_size_ - data_len_);
+  if (len < 0) {
+    // TODO: Do something better like forwarding the error to the user.
+    LOG_ERR(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 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         //
+};
+
+// This is a TLSv1 SERVER_HELLO message.
+static const uint8 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
+};
+
+AsyncSSLSocket::AsyncSSLSocket(AsyncSocket* 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(AsyncSocket * socket) {
+  ASSERT(socket == socket_);
+  // TODO: we could buffer output too...
+  VERIFY(sizeof(kSslClientHello) ==
+      DirectSend(kSslClientHello, sizeof(kSslClientHello)));
+}
+
+void AsyncSSLSocket::ProcessInput(char* data, size_t* len) {
+  if (*len < sizeof(kSslServerHello))
+    return;
+
+  if (memcmp(kSslServerHello, data, sizeof(kSslServerHello)) != 0) {
+    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);
+}
+
+AsyncSSLServerSocket::AsyncSSLServerSocket(AsyncSocket* socket)
+     : BufferedReadAdapter(socket, 1024) {
+  BufferInput(true);
+}
+
+void AsyncSSLServerSocket::ProcessInput(char* data, size_t* len) {
+  // We only accept client hello messages.
+  if (*len < sizeof(kSslClientHello)) {
+    return;
+  }
+
+  if (memcmp(kSslClientHello, data, sizeof(kSslClientHello)) != 0) {
+    Close();
+    SignalCloseEvent(this, 0);
+    return;
+  }
+
+  *len -= sizeof(kSslClientHello);
+
+  // Clients should not send more data until the handshake is completed.
+  ASSERT(*len == 0);
+
+  // Send a server hello back to the client.
+  DirectSend(kSslServerHello, sizeof(kSslServerHello));
+
+  // Handshake completed for us, redirect input to our parent.
+  BufferInput(false);
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+AsyncHttpsProxySocket::AsyncHttpsProxySocket(AsyncSocket* socket,
+                                             const std::string& user_agent,
+                                             const SocketAddress& proxy,
+                                             const std::string& 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;
+  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_ = NULL;
+  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(AsyncSocket * socket) {
+  LOG(LS_VERBOSE) << "AsyncHttpsProxySocket::OnConnectEvent";
+  if (!ShouldIssueConnect()) {
+    state_ = PS_TUNNEL;
+    BufferedReadAdapter::OnConnectEvent(socket);
+    return;
+  }
+  SendRequest();
+}
+
+void AsyncHttpsProxySocket::OnCloseEvent(AsyncSocket * socket, int err) {
+  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 = _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 len = pos - start - 1;
+    if ((len > 0) && (data[start + len - 1] == '\r'))
+      --len;
+
+    data[start + len] = 0;
+    ProcessLine(data + start, len);
+    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() {
+  std::stringstream 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();
+
+  LOG(LS_VERBOSE) << "AsyncHttpsProxySocket >> " << str;
+}
+
+void AsyncHttpsProxySocket::ProcessLine(char * data, size_t len) {
+  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 {
+      static bool report = false;
+      if (!unknown_mechanisms_.empty() && !report) {
+        report = true;
+        std::string msg(
+          "Unable to connect to the Google Talk service due to an incompatibility "
+          "with your proxy.\r\nPlease help us resolve this issue by submitting the "
+          "following information to us using our technical issue submission form "
+          "at:\r\n\r\n"
+          "http://www.google.com/support/talk/bin/request.py\r\n\r\n"
+          "We apologize for the inconvenience.\r\n\r\n"
+          "Information to submit to Google: "
+          );
+        //std::string msg("Please report the following information to foo@bar.com:\r\nUnknown methods: ");
+        msg.append(unknown_mechanisms_);
+#if defined(WEBRTC_WIN)
+        MessageBoxA(0, msg.c_str(), "Oops!", MB_OK);
+#endif
+#if defined(WEBRTC_POSIX)
+        // TODO: Raise a signal so the UI can be separated.
+        LOG(LS_ERROR) << "Oops!\n\n" << msg;
+#endif
+      }
+      // 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)
+             && (_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), state_(SS_ERROR), proxy_(proxy),
+      user_(username), pass_(password) {
+}
+
+int AsyncSocksProxySocket::Connect(const SocketAddress& addr) {
+  int ret;
+  dest_ = addr;
+  state_ = SS_INIT;
+  BufferInput(true);
+  ret = BufferedReadAdapter::Connect(proxy_);
+  // TODO: Set state_ appropriately if Connect fails.
+  return ret;
+}
+
+SocketAddress AsyncSocksProxySocket::GetRemoteAddress() const {
+  return dest_;
+}
+
+int AsyncSocksProxySocket::Close() {
+  state_ = SS_ERROR;
+  dest_.Clear();
+  return BufferedReadAdapter::Close();
+}
+
+Socket::ConnState AsyncSocksProxySocket::GetState() const {
+  if (state_ < SS_TUNNEL) {
+    return CS_CONNECTING;
+  } else if (state_ == SS_TUNNEL) {
+    return CS_CONNECTED;
+  } else {
+    return CS_CLOSED;
+  }
+}
+
+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_.hostname();
+    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);
+}
+
+AsyncSocksProxyServerSocket::AsyncSocksProxyServerSocket(AsyncSocket* socket)
+    : AsyncProxyServerSocket(socket, kBufferSize), state_(SS_HELLO) {
+  BufferInput(true);
+}
+
+void AsyncSocksProxyServerSocket::ProcessInput(char* data, size_t* len) {
+  // TODO: See if the whole message has arrived
+  ASSERT(state_ < SS_CONNECT_PENDING);
+
+  ByteBuffer response(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();
+  memcpy(data, response.Data(), *len);
+}
+
+void AsyncSocksProxyServerSocket::DirectSend(const ByteBuffer& buf) {
+  BufferedReadAdapter::DirectSend(buf.Data(), buf.Length());
+}
+
+void AsyncSocksProxyServerSocket::HandleHello(ByteBuffer* request) {
+  uint8 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 method = 0xFF;
+  if (num_methods > 0 && !request->ReadUInt8(&method)) {
+    Error(0);
+    return;
+  }
+
+  // TODO: Ask the server which method to use.
+  SendHelloReply(method);
+  if (method == 0) {
+    state_ = SS_CONNECT;
+  } else if (method == 2) {
+    state_ = SS_AUTH;
+  } else {
+    state_ = SS_ERROR;
+  }
+}
+
+void AsyncSocksProxyServerSocket::SendHelloReply(int method) {
+  ByteBuffer response;
+  response.WriteUInt8(5);  // Socks Version
+  response.WriteUInt8(method);  // Auth method
+  DirectSend(response);
+}
+
+void AsyncSocksProxyServerSocket::HandleAuth(ByteBuffer* request) {
+  uint8 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;
+  }
+
+  // TODO: Allow for checking of credentials.
+  SendAuthReply(0);
+  state_ = SS_CONNECT;
+}
+
+void AsyncSocksProxyServerSocket::SendAuthReply(int result) {
+  ByteBuffer response;
+  response.WriteUInt8(1);  // Negotiation Version
+  response.WriteUInt8(result);
+  DirectSend(response);
+}
+
+void AsyncSocksProxyServerSocket::HandleConnect(ByteBuffer* request) {
+  uint8 ver, command, reserved, addr_type;
+  uint32 ip;
+  uint16 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;
+
+  ByteBuffer 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);
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+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, 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, 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, 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, pv, res, hex_mode_, &lms_);
+  return res;
+}
+
+int LoggingSocketAdapter::Close() {
+  LogMultiline(level_, label_.c_str(), false, NULL, 0, hex_mode_, &lms_);
+  LogMultiline(level_, label_.c_str(), true, NULL, 0, hex_mode_, &lms_);
+  LOG_V(level_) << label_ << " Closed locally";
+  return socket_->Close();
+}
+
+void LoggingSocketAdapter::OnConnectEvent(AsyncSocket * socket) {
+  LOG_V(level_) << label_ << " Connected";
+  AsyncSocketAdapter::OnConnectEvent(socket);
+}
+
+void LoggingSocketAdapter::OnCloseEvent(AsyncSocket * socket, int err) {
+  LogMultiline(level_, label_.c_str(), false, NULL, 0, hex_mode_, &lms_);
+  LogMultiline(level_, label_.c_str(), true, NULL, 0, hex_mode_, &lms_);
+  LOG_V(level_) << label_ << " Closed with error: " << err;
+  AsyncSocketAdapter::OnCloseEvent(socket, err);
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+}  // namespace rtc