jingle/glue/chrome_async_socket.h

   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 // An implementation of buzz::AsyncSocket that uses Chrome sockets.
   6
   7 #ifndef JINGLE_GLUE_CHROME_ASYNC_SOCKET_H_
   8 #define JINGLE_GLUE_CHROME_ASYNC_SOCKET_H_
   9
  10 #if !defined(FEATURE_ENABLE_SSL)
  11 #error ChromeAsyncSocket expects FEATURE_ENABLE_SSL to be defined
  12 #endif
  13
  14 #include <string>
  15 #include <vector>
  16
  17 #include "base/basictypes.h"
  18 #include "base/compiler_specific.h"
  19 #include "base/memory/ref_counted.h"
  20 #include "base/memory/scoped_ptr.h"
  21 #include "base/memory/weak_ptr.h"
  22 #include "net/base/completion_callback.h"
  23 #include "net/base/net_errors.h"
  24 #include "third_party/webrtc/libjingle/xmpp/asyncsocket.h"
  25
  26 namespace net {
  27 class IOBufferWithSize;
  28 class StreamSocket;
  29 }  // namespace net
  30
  31 namespace jingle_glue {
  32
  33 class ResolvingClientSocketFactory;
  34
  35 class ChromeAsyncSocket : public buzz::AsyncSocket {
  36  public:
  37   // Takes ownership of |resolving_client_socket_factory|.
  38   ChromeAsyncSocket(
  39       ResolvingClientSocketFactory* resolving_client_socket_factory,
  40       size_t read_buf_size,
  41       size_t write_buf_size);
  42
  43   // Does not raise any signals.
  44   ~ChromeAsyncSocket() override;
  45
  46   // buzz::AsyncSocket implementation.
  47
  48   // The current state (see buzz::AsyncSocket::State; all but
  49   // STATE_CLOSING is used).
  50   State state() override;
  51
  52   // The last generated error.  Errors are generated when the main
  53   // functions below return false or when SignalClosed is raised due
  54   // to an asynchronous error.
  55   Error error() override;
  56
  57   // GetError() (which is of type net::Error) != net::OK only when
  58   // error() == ERROR_WINSOCK.
  59   int GetError() override;
  60
  61   // Tries to connect to the given address.
  62   //
  63   // If state() is not STATE_CLOSED, sets error to ERROR_WRONGSTATE
  64   // and returns false.
  65   //
  66   // If |address| has an empty hostname or a zero port, sets error to
  67   // ERROR_DNS and returns false.  (We don't use the IP address even
  68   // if it's present, as DNS resolution is done by
  69   // |resolving_client_socket_factory_|.  But it's perfectly fine if
  70   // the hostname is a stringified IP address.)
  71   //
  72   // Otherwise, starts the connection process and returns true.
  73   // SignalConnected will be raised when the connection is successful;
  74   // otherwise, SignalClosed will be raised with a net error set.
  75   bool Connect(const rtc::SocketAddress& address) override;
  76
  77   // Tries to read at most |len| bytes into |data|.
  78   //
  79   // If state() is not STATE_TLS_CONNECTING, STATE_OPEN, or
  80   // STATE_TLS_OPEN, sets error to ERROR_WRONGSTATE and returns false.
  81   //
  82   // Otherwise, fills in |len_read| with the number of bytes read and
  83   // returns true.  If this is called when state() is
  84   // STATE_TLS_CONNECTING, reads 0 bytes.  (We have to handle this
  85   // case because StartTls() is called during a slot connected to
  86   // SignalRead after parsing the final non-TLS reply from the server
  87   // [see XmppClient::Private::OnSocketRead()].)
  88   bool Read(char* data, size_t len, size_t* len_read) override;
  89
  90   // Queues up |len| bytes of |data| for writing.
  91   //
  92   // If state() is not STATE_TLS_CONNECTING, STATE_OPEN, or
  93   // STATE_TLS_OPEN, sets error to ERROR_WRONGSTATE and returns false.
  94   //
  95   // If the given data is too big for the internal write buffer, sets
  96   // error to ERROR_WINSOCK/net::ERR_INSUFFICIENT_RESOURCES and
  97   // returns false.
  98   //
  99   // Otherwise, queues up the data and returns true.  If this is
 100   // called when state() == STATE_TLS_CONNECTING, the data is will be
 101   // sent only after the TLS connection succeeds.  (See StartTls()
 102   // below for why this happens.)
 103   //
 104   // Note that there's no guarantee that the data will actually be
 105   // sent; however, it is guaranteed that the any data sent will be
 106   // sent in FIFO order.
 107   bool Write(const char* data, size_t len) override;
 108
 109   // If the socket is not already closed, closes the socket and raises
 110   // SignalClosed.  Always returns true.
 111   bool Close() override;
 112
 113   // Tries to change to a TLS connection with the given domain name.
 114   //
 115   // If state() is not STATE_OPEN or there are pending reads or
 116   // writes, sets error to ERROR_WRONGSTATE and returns false.  (In
 117   // practice, this means that StartTls() can only be called from a
 118   // slot connected to SignalRead.)
 119   //
 120   // Otherwise, starts the TLS connection process and returns true.
 121   // SignalSSLConnected will be raised when the connection is
 122   // successful; otherwise, SignalClosed will be raised with a net
 123   // error set.
 124   bool StartTls(const std::string& domain_name) override;
 125
 126   // Signal behavior:
 127   //
 128   // SignalConnected: raised whenever the connect initiated by a call
 129   // to Connect() is complete.
 130   //
 131   // SignalSSLConnected: raised whenever the connect initiated by a
 132   // call to StartTls() is complete.  Not actually used by
 133   // XmppClient. (It just assumes that if SignalRead is raised after a
 134   // call to StartTls(), the connection has been successfully
 135   // upgraded.)
 136   //
 137   // SignalClosed: raised whenever the socket is closed, either due to
 138   // an asynchronous error, the other side closing the connection, or
 139   // when Close() is called.
 140   //
 141   // SignalRead: raised whenever the next call to Read() will succeed
 142   // with a non-zero |len_read| (assuming nothing else happens in the
 143   // meantime).
 144   //
 145   // SignalError: not used.
 146
 147  private:
 148   enum AsyncIOState {
 149     // An I/O op is not in progress.
 150     IDLE,
 151     // A function has been posted to do the I/O.
 152     POSTED,
 153     // An async I/O operation is pending.
 154     PENDING,
 155   };
 156
 157   bool IsOpen() const;
 158
 159   // Error functions.
 160   void DoNonNetError(Error error);
 161   void DoNetError(net::Error net_error);
 162   void DoNetErrorFromStatus(int status);
 163
 164   // Connection functions.
 165   void ProcessConnectDone(int status);
 166
 167   // Read loop functions.
 168   void PostDoRead();
 169   void DoRead();
 170   void ProcessReadDone(int status);
 171
 172   // Write loop functions.
 173   void PostDoWrite();
 174   void DoWrite();
 175   void ProcessWriteDone(int status);
 176
 177   // SSL/TLS connection functions.
 178   void ProcessSSLConnectDone(int status);
 179
 180   // Close functions.
 181   void DoClose();
 182
 183   scoped_ptr<ResolvingClientSocketFactory> resolving_client_socket_factory_;
 184
 185   // buzz::AsyncSocket state.
 186   buzz::AsyncSocket::State state_;
 187   buzz::AsyncSocket::Error error_;
 188   net::Error net_error_;
 189
 190   // NULL iff state() == STATE_CLOSED.
 191   scoped_ptr<net::StreamSocket> transport_socket_;
 192
 193   // State for the read loop.  |read_start_| <= |read_end_| <=
 194   // |read_buf_->size()|.  There's a read in flight (i.e.,
 195   // |read_state_| != IDLE) iff |read_end_| == 0.
 196   AsyncIOState read_state_;
 197   scoped_refptr<net::IOBufferWithSize> read_buf_;
 198   size_t read_start_, read_end_;
 199
 200   // State for the write loop.  |write_end_| <= |write_buf_->size()|.
 201   // There's a write in flight (i.e., |write_state_| != IDLE) iff
 202   // |write_end_| > 0.
 203   AsyncIOState write_state_;
 204   scoped_refptr<net::IOBufferWithSize> write_buf_;
 205   size_t write_end_;
 206
 207   base::WeakPtrFactory<ChromeAsyncSocket> weak_ptr_factory_;
 208
 209   DISALLOW_COPY_AND_ASSIGN(ChromeAsyncSocket);
 210 };
 211
 212 }  // namespace jingle_glue
 213
 214 #endif  // JINGLE_GLUE_CHROME_ASYNC_SOCKET_H_