content/browser/devtools/tethering_handler.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "content/browser/devtools/tethering_handler.h"
   6
   7 #include "base/bind.h"
   8 #include "base/callback.h"
   9 #include "base/stl_util.h"
  10 #include "base/values.h"
  11 #include "content/browser/devtools/devtools_http_handler_impl.h"
  12 #include "content/public/browser/devtools_client_host.h"
  13 #include "content/public/browser/devtools_http_handler_delegate.h"
  14 #include "net/base/io_buffer.h"
  15 #include "net/base/ip_endpoint.h"
  16 #include "net/base/net_errors.h"
  17 #include "net/base/net_log.h"
  18 #include "net/socket/stream_listen_socket.h"
  19 #include "net/socket/stream_socket.h"
  20 #include "net/socket/tcp_server_socket.h"
  21
  22 namespace content {
  23
  24 namespace {
  25
  26 const char kTetheringBind[] = "Tethering.bind";
  27 const char kTetheringUnbind[] = "Tethering.unbind";
  28
  29 const char kTetheringAccepted[] = "Tethering.accepted";
  30
  31 const char kPortParam[] = "port";
  32 const char kConnectionIdParam[] = "connectionId";
  33
  34 const char kLocalhost[] = "127.0.0.1";
  35
  36 const int kListenBacklog = 5;
  37 const int kBufferSize = 16 * 1024;
  38
  39 const int kMinTetheringPort = 5000;
  40 const int kMaxTetheringPort = 10000;
  41
  42 class SocketPump : public net::StreamListenSocket::Delegate {
  43  public:
  44   SocketPump(DevToolsHttpHandlerDelegate* delegate,
  45              net::StreamSocket* client_socket)
  46       : client_socket_(client_socket),
  47         delegate_(delegate),
  48         wire_buffer_size_(0),
  49         pending_destruction_(false) {
  50   }
  51
  52   std::string Init() {
  53     std::string channel_name;
  54     server_socket_ = delegate_->CreateSocketForTethering(this, &channel_name);
  55     if (!server_socket_.get() || channel_name.empty())
  56       SelfDestruct();
  57     return channel_name;
  58   }
  59
  60   virtual ~SocketPump() { }
  61
  62  private:
  63   virtual void DidAccept(net::StreamListenSocket* server,
  64                          scoped_ptr<net::StreamListenSocket> socket) OVERRIDE {
  65     if (accepted_socket_.get())
  66       return;
  67
  68     buffer_ = new net::IOBuffer(kBufferSize);
  69     wire_buffer_ = new net::GrowableIOBuffer();
  70     wire_buffer_->SetCapacity(kBufferSize);
  71
  72     accepted_socket_ = socket.Pass();
  73     int result = client_socket_->Read(
  74         buffer_.get(),
  75         kBufferSize,
  76         base::Bind(&SocketPump::OnClientRead, base::Unretained(this)));
  77     if (result != net::ERR_IO_PENDING)
  78       OnClientRead(result);
  79   }
  80
  81   virtual void DidRead(net::StreamListenSocket* socket,
  82                        const char* data,
  83                        int len) OVERRIDE {
  84     int old_size = wire_buffer_size_;
  85     wire_buffer_size_ += len;
  86     while (wire_buffer_->capacity() < wire_buffer_size_)
  87       wire_buffer_->SetCapacity(wire_buffer_->capacity() * 2);
  88     memcpy(wire_buffer_->StartOfBuffer() + old_size, data, len);
  89     if (old_size != wire_buffer_->offset())
  90       return;
  91     OnClientWrite(0);
  92   }
  93
  94   virtual void DidClose(net::StreamListenSocket* socket) OVERRIDE {
  95     SelfDestruct();
  96   }
  97
  98   void OnClientRead(int result) {
  99     if (result <= 0) {
 100       SelfDestruct();
 101       return;
 102     }
 103
 104     accepted_socket_->Send(buffer_->data(), result);
 105     result = client_socket_->Read(
 106         buffer_.get(),
 107         kBufferSize,
 108         base::Bind(&SocketPump::OnClientRead, base::Unretained(this)));
 109     if (result != net::ERR_IO_PENDING)
 110       OnClientRead(result);
 111   }
 112
 113   void OnClientWrite(int result) {
 114     if (result < 0)
 115       SelfDestruct();
 116
 117     wire_buffer_->set_offset(wire_buffer_->offset() + result);
 118
 119     int remaining = wire_buffer_size_ - wire_buffer_->offset();
 120     if (remaining == 0) {
 121       if (pending_destruction_)
 122         SelfDestruct();
 123       return;
 124     }
 125
 126
 127     if (remaining > kBufferSize)
 128       remaining = kBufferSize;
 129
 130     scoped_refptr<net::IOBuffer> buffer = new net::IOBuffer(remaining);
 131     memcpy(buffer->data(), wire_buffer_->data(), remaining);
 132     result = client_socket_->Write(
 133         buffer.get(),
 134         remaining,
 135         base::Bind(&SocketPump::OnClientWrite, base::Unretained(this)));
 136
 137     // Shrink buffer
 138     int offset = wire_buffer_->offset();
 139     if (offset > kBufferSize) {
 140       memcpy(wire_buffer_->StartOfBuffer(), wire_buffer_->data(),
 141           wire_buffer_size_ - offset);
 142       wire_buffer_size_ -= offset;
 143       wire_buffer_->set_offset(0);
 144     }
 145
 146     if (result != net::ERR_IO_PENDING)
 147       OnClientWrite(result);
 148     return;
 149   }
 150
 151   void SelfDestruct() {
 152     if (wire_buffer_ && wire_buffer_->offset() != wire_buffer_size_) {
 153       pending_destruction_ = true;
 154       return;
 155     }
 156     delete this;
 157   }
 158
 159  private:
 160   scoped_ptr<net::StreamSocket> client_socket_;
 161   scoped_ptr<net::StreamListenSocket> server_socket_;
 162   scoped_ptr<net::StreamListenSocket> accepted_socket_;
 163   scoped_refptr<net::IOBuffer> buffer_;
 164   scoped_refptr<net::GrowableIOBuffer> wire_buffer_;
 165   DevToolsHttpHandlerDelegate* delegate_;
 166   int wire_buffer_size_;
 167   bool pending_destruction_;
 168 };
 169
 170 }  // namespace
 171
 172 const char TetheringHandler::kDomain[] = "Tethering";
 173
 174 class TetheringHandler::BoundSocket {
 175  public:
 176   BoundSocket(TetheringHandler* handler,
 177               DevToolsHttpHandlerDelegate* delegate)
 178       : handler_(handler),
 179         delegate_(delegate),
 180         socket_(new net::TCPServerSocket(NULL, net::NetLog::Source())),
 181         port_(0) {
 182   }
 183
 184   virtual ~BoundSocket() {
 185   }
 186
 187   bool Listen(int port) {
 188     port_ = port;
 189     net::IPAddressNumber ip_number;
 190     if (!net::ParseIPLiteralToNumber(kLocalhost, &ip_number))
 191       return false;
 192
 193     net::IPEndPoint end_point(ip_number, port);
 194     int result = socket_->Listen(end_point, kListenBacklog);
 195     if (result < 0)
 196       return false;
 197
 198     net::IPEndPoint local_address;
 199     result = socket_->GetLocalAddress(&local_address);
 200     if (result < 0)
 201       return false;
 202
 203     DoAccept();
 204     return true;
 205   }
 206
 207  private:
 208   typedef std::map<net::IPEndPoint, net::StreamSocket*> AcceptedSocketsMap;
 209
 210   void DoAccept() {
 211     while (true) {
 212       int result = socket_->Accept(
 213           &accept_socket_,
 214           base::Bind(&BoundSocket::OnAccepted, base::Unretained(this)));
 215       if (result == net::ERR_IO_PENDING)
 216         break;
 217       else
 218         HandleAcceptResult(result);
 219     }
 220   }
 221
 222   void OnAccepted(int result) {
 223     HandleAcceptResult(result);
 224     if (result == net::OK)
 225       DoAccept();
 226   }
 227
 228   void HandleAcceptResult(int result) {
 229     if (result != net::OK)
 230       return;
 231
 232     SocketPump* pump = new SocketPump(delegate_, accept_socket_.release());
 233     std::string name = pump->Init();
 234     if (!name.empty())
 235       handler_->Accepted(port_, name);
 236   }
 237
 238   TetheringHandler* handler_;
 239   DevToolsHttpHandlerDelegate* delegate_;
 240   scoped_ptr<net::ServerSocket> socket_;
 241   scoped_ptr<net::StreamSocket> accept_socket_;
 242   int port_;
 243 };
 244
 245 TetheringHandler::TetheringHandler(DevToolsHttpHandlerDelegate* delegate)
 246     : delegate_(delegate) {
 247   RegisterCommandHandler(kTetheringBind,
 248                          base::Bind(&TetheringHandler::OnBind,
 249                                     base::Unretained(this)));
 250   RegisterCommandHandler(kTetheringUnbind,
 251                          base::Bind(&TetheringHandler::OnUnbind,
 252                                     base::Unretained(this)));
 253 }
 254
 255 TetheringHandler::~TetheringHandler() {
 256   STLDeleteContainerPairSecondPointers(bound_sockets_.begin(),
 257                                        bound_sockets_.end());
 258 }
 259
 260 void TetheringHandler::Accepted(int port, const std::string& name) {
 261   base::DictionaryValue* params = new base::DictionaryValue();
 262   params->SetInteger(kPortParam, port);
 263   params->SetString(kConnectionIdParam, name);
 264   SendNotification(kTetheringAccepted, params);
 265 }
 266
 267 static int GetPort(scoped_refptr<DevToolsProtocol::Command> command) {
 268   base::DictionaryValue* params = command->params();
 269   int port = 0;
 270   if (!params || !params->GetInteger(kPortParam, &port) ||
 271       port < kMinTetheringPort || port > kMaxTetheringPort)
 272     return 0;
 273   return port;
 274 }
 275
 276 scoped_refptr<DevToolsProtocol::Response>
 277 TetheringHandler::OnBind(scoped_refptr<DevToolsProtocol::Command> command) {
 278   int port = GetPort(command);
 279   if (port == 0)
 280     return command->InvalidParamResponse(kPortParam);
 281
 282   if (bound_sockets_.find(port) != bound_sockets_.end())
 283     return command->InternalErrorResponse("Port already bound");
 284
 285   scoped_ptr<BoundSocket> bound_socket(new BoundSocket(this, delegate_));
 286   if (!bound_socket->Listen(port))
 287     return command->InternalErrorResponse("Could not bind port");
 288
 289   bound_sockets_[port] = bound_socket.release();
 290   return command->SuccessResponse(NULL);
 291 }
 292
 293 scoped_refptr<DevToolsProtocol::Response>
 294 TetheringHandler::OnUnbind(scoped_refptr<DevToolsProtocol::Command> command) {
 295   int port = GetPort(command);
 296   if (port == 0)
 297     return command->InvalidParamResponse(kPortParam);
 298
 299   BoundSockets::iterator it = bound_sockets_.find(port);
 300   if (it == bound_sockets_.end())
 301     return command->InternalErrorResponse("Port is not bound");
 302
 303   delete it->second;
 304   bound_sockets_.erase(it);
 305   return command->SuccessResponse(NULL);
 306 }
 307
 308 }  // namespace content