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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:
ProxySocketAdapter(SslSocketFactory * factory,int type)46   ProxySocketAdapter(SslSocketFactory* factory, int type)
47       : AsyncSocketAdapter(NULL), factory_(factory), type_(type),
48         detect_(NULL) {
49   }
~ProxySocketAdapter()50   virtual ~ProxySocketAdapter() {
51     Close();
52   }
53 
Connect(const SocketAddress & addr)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   }
GetError() const70   virtual int GetError() const {
71     if (socket_) {
72       return socket_->GetError();
73     }
74     return detect_ ? EWOULDBLOCK : EADDRNOTAVAIL;
75   }
Close()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   }
GetState() const86   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
OnProxyDetectionComplete(SignalThread * thread)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 
CreateSocket(int type)117 Socket* SslSocketFactory::CreateSocket(int type) {
118   return factory_->CreateSocket(type);
119 }
120 
CreateAsyncSocket(int type)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 
CreateProxySocket(const ProxyInfo & proxy,int type)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