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      1 /*
      2  *  Copyright 2007 The WebRTC Project Authors. All rights reserved.
      3  *
      4  *  Use of this source code is governed by a BSD-style license
      5  *  that can be found in the LICENSE file in the root of the source
      6  *  tree. An additional intellectual property rights grant can be found
      7  *  in the file PATENTS.  All contributing project authors may
      8  *  be found in the AUTHORS file in the root of the source tree.
      9  */
     10 
     11 #include "webrtc/base/autodetectproxy.h"
     12 #include "webrtc/base/httpcommon.h"
     13 #include "webrtc/base/httpcommon-inl.h"
     14 #include "webrtc/base/socketadapters.h"
     15 #include "webrtc/base/ssladapter.h"
     16 #include "webrtc/base/sslsocketfactory.h"
     17 
     18 namespace rtc {
     19 
     20 ///////////////////////////////////////////////////////////////////////////////
     21 // ProxySocketAdapter
     22 // TODO: Consider combining AutoDetectProxy and ProxySocketAdapter.  I think
     23 // the socket adapter is the more appropriate idiom for automatic proxy
     24 // detection.  We may or may not want to combine proxydetect.* as well.
     25 ///////////////////////////////////////////////////////////////////////////////
     26 
     27 class ProxySocketAdapter : public AsyncSocketAdapter {
     28  public:
     29   ProxySocketAdapter(SslSocketFactory* factory, int family, int type)
     30       : AsyncSocketAdapter(NULL), factory_(factory), family_(family),
     31         type_(type), detect_(NULL) {
     32   }
     33   virtual ~ProxySocketAdapter() {
     34     Close();
     35   }
     36 
     37   virtual int Connect(const SocketAddress& addr) {
     38     ASSERT(NULL == detect_);
     39     ASSERT(NULL == socket_);
     40     remote_ = addr;
     41     if (remote_.IsAnyIP() && remote_.hostname().empty()) {
     42       LOG_F(LS_ERROR) << "Empty address";
     43       return SOCKET_ERROR;
     44     }
     45     Url<char> url("/", remote_.HostAsURIString(), remote_.port());
     46     detect_ = new AutoDetectProxy(factory_->agent_);
     47     detect_->set_server_url(url.url());
     48     detect_->SignalWorkDone.connect(this,
     49         &ProxySocketAdapter::OnProxyDetectionComplete);
     50     detect_->Start();
     51     return SOCKET_ERROR;
     52   }
     53   virtual int GetError() const {
     54     if (socket_) {
     55       return socket_->GetError();
     56     }
     57     return detect_ ? EWOULDBLOCK : EADDRNOTAVAIL;
     58   }
     59   virtual int Close() {
     60     if (socket_) {
     61       return socket_->Close();
     62     }
     63     if (detect_) {
     64       detect_->Destroy(false);
     65       detect_ = NULL;
     66     }
     67     return 0;
     68   }
     69   virtual ConnState GetState() const {
     70     if (socket_) {
     71       return socket_->GetState();
     72     }
     73     return detect_ ? CS_CONNECTING : CS_CLOSED;
     74   }
     75 
     76 private:
     77   // AutoDetectProxy Slots
     78   void OnProxyDetectionComplete(SignalThread* thread) {
     79     ASSERT(detect_ == thread);
     80     Attach(factory_->CreateProxySocket(detect_->proxy(), family_, type_));
     81     detect_->Release();
     82     detect_ = NULL;
     83     if (0 == AsyncSocketAdapter::Connect(remote_)) {
     84       SignalConnectEvent(this);
     85     } else if (!IsBlockingError(socket_->GetError())) {
     86       SignalCloseEvent(this, socket_->GetError());
     87     }
     88   }
     89 
     90   SslSocketFactory* factory_;
     91   int family_;
     92   int type_;
     93   SocketAddress remote_;
     94   AutoDetectProxy* detect_;
     95 };
     96 
     97 ///////////////////////////////////////////////////////////////////////////////
     98 // SslSocketFactory
     99 ///////////////////////////////////////////////////////////////////////////////
    100 
    101 Socket* SslSocketFactory::CreateSocket(int type) {
    102   return CreateSocket(AF_INET, type);
    103 }
    104 
    105 Socket* SslSocketFactory::CreateSocket(int family, int type) {
    106   return factory_->CreateSocket(family, type);
    107 }
    108 
    109 AsyncSocket* SslSocketFactory::CreateAsyncSocket(int type) {
    110   return CreateAsyncSocket(AF_INET, type);
    111 }
    112 
    113 AsyncSocket* SslSocketFactory::CreateAsyncSocket(int family, int type) {
    114   if (autodetect_proxy_) {
    115     return new ProxySocketAdapter(this, family, type);
    116   } else {
    117     return CreateProxySocket(proxy_, family, type);
    118   }
    119 }
    120 
    121 
    122 AsyncSocket* SslSocketFactory::CreateProxySocket(const ProxyInfo& proxy,
    123                                                  int family,
    124                                                  int type) {
    125   AsyncSocket* socket = factory_->CreateAsyncSocket(family, type);
    126   if (!socket)
    127     return NULL;
    128 
    129   // Binary logging happens at the lowest level
    130   if (!logging_label_.empty() && binary_mode_) {
    131     socket = new LoggingSocketAdapter(socket, logging_level_,
    132                                       logging_label_.c_str(), binary_mode_);
    133   }
    134 
    135   if (proxy.type) {
    136     AsyncSocket* proxy_socket = 0;
    137     if (proxy_.type == PROXY_SOCKS5) {
    138       proxy_socket = new AsyncSocksProxySocket(socket, proxy.address,
    139                                                proxy.username, proxy.password);
    140     } else {
    141       // Note: we are trying unknown proxies as HTTPS currently
    142       AsyncHttpsProxySocket* http_proxy =
    143           new AsyncHttpsProxySocket(socket, agent_, proxy.address,
    144                                     proxy.username, proxy.password);
    145       http_proxy->SetForceConnect(force_connect_ || !hostname_.empty());
    146       proxy_socket = http_proxy;
    147     }
    148     if (!proxy_socket) {
    149       delete socket;
    150       return NULL;
    151     }
    152     socket = proxy_socket;  // for our purposes the proxy is now the socket
    153   }
    154 
    155   if (!hostname_.empty()) {
    156     if (SSLAdapter* ssl_adapter = SSLAdapter::Create(socket)) {
    157       ssl_adapter->set_ignore_bad_cert(ignore_bad_cert_);
    158       ssl_adapter->StartSSL(hostname_.c_str(), true);
    159       socket = ssl_adapter;
    160     } else {
    161       LOG_F(LS_ERROR) << "SSL unavailable";
    162     }
    163   }
    164 
    165   // Regular logging occurs at the highest level
    166   if (!logging_label_.empty() && !binary_mode_) {
    167     socket = new LoggingSocketAdapter(socket, logging_level_,
    168                                       logging_label_.c_str(), binary_mode_);
    169   }
    170   return socket;
    171 }
    172 
    173 ///////////////////////////////////////////////////////////////////////////////
    174 
    175 }  // namespace rtc
    176