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      1 /*
      2  * libjingle
      3  * Copyright 2007, Google Inc.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions are met:
      7  *
      8  *  1. Redistributions of source code must retain the above copyright notice,
      9  *     this list of conditions and the following disclaimer.
     10  *  2. Redistributions in binary form must reproduce the above copyright notice,
     11  *     this list of conditions and the following disclaimer in the documentation
     12  *     and/or other materials provided with the distribution.
     13  *  3. The name of the author may not be used to endorse or promote products
     14  *     derived from this software without specific prior written permission.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
     17  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     18  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
     19  * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     20  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     21  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
     22  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     23  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
     24  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
     25  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26  */
     27 
     28 #include "talk/base/autodetectproxy.h"
     29 #include "talk/base/httpcommon.h"
     30 #include "talk/base/httpcommon-inl.h"
     31 #include "talk/base/socketadapters.h"
     32 #include "talk/base/ssladapter.h"
     33 #include "talk/base/sslsocketfactory.h"
     34 
     35 namespace talk_base {
     36 
     37 ///////////////////////////////////////////////////////////////////////////////
     38 // ProxySocketAdapter
     39 // TODO: Consider combining AutoDetectProxy and ProxySocketAdapter.  I think
     40 // the socket adapter is the more appropriate idiom for automatic proxy
     41 // detection.  We may or may not want to combine proxydetect.* as well.
     42 ///////////////////////////////////////////////////////////////////////////////
     43 
     44 class ProxySocketAdapter : public AsyncSocketAdapter {
     45  public:
     46   ProxySocketAdapter(SslSocketFactory* factory, int type)
     47       : AsyncSocketAdapter(NULL), factory_(factory), type_(type),
     48         detect_(NULL) {
     49   }
     50   virtual ~ProxySocketAdapter() {
     51     Close();
     52   }
     53 
     54   virtual int Connect(const SocketAddress& addr) {
     55     ASSERT(NULL == detect_);
     56     ASSERT(NULL == socket_);
     57     remote_ = addr;
     58     if (remote_.IsAnyIP() && remote_.hostname().empty()) {
     59       LOG_F(LS_ERROR) << "Empty address";
     60       return SOCKET_ERROR;
     61     }
     62     Url<char> url("/", remote_.IPAsString(), remote_.port());
     63     detect_ = new AutoDetectProxy(factory_->agent_);
     64     detect_->set_server_url(url.url());
     65     detect_->SignalWorkDone.connect(this,
     66         &ProxySocketAdapter::OnProxyDetectionComplete);
     67     detect_->Start();
     68     return SOCKET_ERROR;
     69   }
     70   virtual int GetError() const {
     71     if (socket_) {
     72       return socket_->GetError();
     73     }
     74     return detect_ ? EWOULDBLOCK : EADDRNOTAVAIL;
     75   }
     76   virtual int Close() {
     77     if (socket_) {
     78       return socket_->Close();
     79     }
     80     if (detect_) {
     81       detect_->Destroy(false);
     82       detect_ = NULL;
     83     }
     84     return 0;
     85   }
     86   virtual ConnState GetState() const {
     87     if (socket_) {
     88       return socket_->GetState();
     89     }
     90     return detect_ ? CS_CONNECTING : CS_CLOSED;
     91   }
     92 
     93 private:
     94   // AutoDetectProxy Slots
     95   void OnProxyDetectionComplete(SignalThread* thread) {
     96     ASSERT(detect_ == thread);
     97     Attach(factory_->CreateProxySocket(detect_->proxy(), type_));
     98     detect_->Release();
     99     detect_ = NULL;
    100     if (0 == AsyncSocketAdapter::Connect(remote_)) {
    101       SignalConnectEvent(this);
    102     } else if (!IsBlockingError(socket_->GetError())) {
    103       SignalCloseEvent(this, socket_->GetError());
    104     }
    105   }
    106 
    107   SslSocketFactory* factory_;
    108   int type_;
    109   SocketAddress remote_;
    110   AutoDetectProxy* detect_;
    111 };
    112 
    113 ///////////////////////////////////////////////////////////////////////////////
    114 // SslSocketFactory
    115 ///////////////////////////////////////////////////////////////////////////////
    116 
    117 Socket* SslSocketFactory::CreateSocket(int type) {
    118   return factory_->CreateSocket(type);
    119 }
    120 
    121 AsyncSocket* SslSocketFactory::CreateAsyncSocket(int type) {
    122   if (autodetect_proxy_) {
    123     return new ProxySocketAdapter(this, type);
    124   } else {
    125     return CreateProxySocket(proxy_, type);
    126   }
    127 }
    128 
    129 AsyncSocket* SslSocketFactory::CreateProxySocket(const ProxyInfo& proxy,
    130                                                  int type) {
    131   AsyncSocket* socket = factory_->CreateAsyncSocket(type);
    132   if (!socket)
    133     return NULL;
    134 
    135   // Binary logging happens at the lowest level
    136   if (!logging_label_.empty() && binary_mode_) {
    137     socket = new LoggingSocketAdapter(socket, logging_level_,
    138                                       logging_label_.c_str(), binary_mode_);
    139   }
    140 
    141   if (proxy.type) {
    142     AsyncSocket* proxy_socket = 0;
    143     if (proxy_.type == PROXY_SOCKS5) {
    144       proxy_socket = new AsyncSocksProxySocket(socket, proxy.address,
    145                                                proxy.username, proxy.password);
    146     } else {
    147       // Note: we are trying unknown proxies as HTTPS currently
    148       AsyncHttpsProxySocket* http_proxy =
    149           new AsyncHttpsProxySocket(socket, agent_, proxy.address,
    150                                     proxy.username, proxy.password);
    151       http_proxy->SetForceConnect(force_connect_ || !hostname_.empty());
    152       proxy_socket = http_proxy;
    153     }
    154     if (!proxy_socket) {
    155       delete socket;
    156       return NULL;
    157     }
    158     socket = proxy_socket;  // for our purposes the proxy is now the socket
    159   }
    160 
    161   if (!hostname_.empty()) {
    162     if (SSLAdapter* ssl_adapter = SSLAdapter::Create(socket)) {
    163       ssl_adapter->set_ignore_bad_cert(ignore_bad_cert_);
    164       ssl_adapter->StartSSL(hostname_.c_str(), true);
    165       socket = ssl_adapter;
    166     } else {
    167       LOG_F(LS_ERROR) << "SSL unavailable";
    168     }
    169   }
    170 
    171   // Regular logging occurs at the highest level
    172   if (!logging_label_.empty() && !binary_mode_) {
    173     socket = new LoggingSocketAdapter(socket, logging_level_,
    174                                       logging_label_.c_str(), binary_mode_);
    175   }
    176   return socket;
    177 }
    178 
    179 ///////////////////////////////////////////////////////////////////////////////
    180 
    181 }  // namespace talk_base
    182