mflodman@webrtc.org | 5976650 | 2013-07-22 15:57:04 +0000 | [diff] [blame] | 1 | /* |
| 2 | * libjingle |
| 3 | * Copyright 2004--2005, 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/proxyserver.h" |
| 29 | |
| 30 | #include <algorithm> |
| 31 | #include "talk/base/socketfactory.h" |
| 32 | |
| 33 | namespace talk_base { |
| 34 | |
| 35 | // ProxyServer |
| 36 | ProxyServer::ProxyServer( |
| 37 | SocketFactory* int_factory, const SocketAddress& int_addr, |
| 38 | SocketFactory* ext_factory, const SocketAddress& ext_ip) |
| 39 | : ext_factory_(ext_factory), ext_ip_(ext_ip.ipaddr(), 0), // strip off port |
| 40 | server_socket_(int_factory->CreateAsyncSocket(int_addr.family(), |
| 41 | SOCK_STREAM)) { |
| 42 | ASSERT(server_socket_.get() != NULL); |
| 43 | ASSERT(int_addr.family() == AF_INET || int_addr.family() == AF_INET6); |
| 44 | server_socket_->Bind(int_addr); |
| 45 | server_socket_->Listen(5); |
| 46 | server_socket_->SignalReadEvent.connect(this, &ProxyServer::OnAcceptEvent); |
| 47 | } |
| 48 | |
| 49 | ProxyServer::~ProxyServer() { |
| 50 | for (BindingList::iterator it = bindings_.begin(); |
| 51 | it != bindings_.end(); ++it) { |
| 52 | delete (*it); |
| 53 | } |
| 54 | } |
| 55 | |
| 56 | void ProxyServer::OnAcceptEvent(AsyncSocket* socket) { |
| 57 | ASSERT(socket != NULL && socket == server_socket_.get()); |
| 58 | AsyncSocket* int_socket = socket->Accept(NULL); |
| 59 | AsyncProxyServerSocket* wrapped_socket = WrapSocket(int_socket); |
| 60 | AsyncSocket* ext_socket = ext_factory_->CreateAsyncSocket(ext_ip_.family(), |
| 61 | SOCK_STREAM); |
| 62 | if (ext_socket) { |
| 63 | ext_socket->Bind(ext_ip_); |
| 64 | bindings_.push_back(new ProxyBinding(wrapped_socket, ext_socket)); |
| 65 | } else { |
| 66 | LOG(LS_ERROR) << "Unable to create external socket on proxy accept event"; |
| 67 | } |
| 68 | } |
| 69 | |
| 70 | void ProxyServer::OnBindingDestroyed(ProxyBinding* binding) { |
| 71 | BindingList::iterator it = |
| 72 | std::find(bindings_.begin(), bindings_.end(), binding); |
| 73 | delete (*it); |
| 74 | bindings_.erase(it); |
| 75 | } |
| 76 | |
| 77 | // ProxyBinding |
| 78 | ProxyBinding::ProxyBinding(AsyncProxyServerSocket* int_socket, |
| 79 | AsyncSocket* ext_socket) |
| 80 | : int_socket_(int_socket), ext_socket_(ext_socket), connected_(false), |
| 81 | out_buffer_(kBufferSize), in_buffer_(kBufferSize) { |
| 82 | int_socket_->SignalConnectRequest.connect(this, |
| 83 | &ProxyBinding::OnConnectRequest); |
| 84 | int_socket_->SignalReadEvent.connect(this, &ProxyBinding::OnInternalRead); |
| 85 | int_socket_->SignalWriteEvent.connect(this, &ProxyBinding::OnInternalWrite); |
| 86 | int_socket_->SignalCloseEvent.connect(this, &ProxyBinding::OnInternalClose); |
| 87 | ext_socket_->SignalConnectEvent.connect(this, |
| 88 | &ProxyBinding::OnExternalConnect); |
| 89 | ext_socket_->SignalReadEvent.connect(this, &ProxyBinding::OnExternalRead); |
| 90 | ext_socket_->SignalWriteEvent.connect(this, &ProxyBinding::OnExternalWrite); |
| 91 | ext_socket_->SignalCloseEvent.connect(this, &ProxyBinding::OnExternalClose); |
| 92 | } |
| 93 | |
| 94 | void ProxyBinding::OnConnectRequest(AsyncProxyServerSocket* socket, |
| 95 | const SocketAddress& addr) { |
| 96 | ASSERT(!connected_ && ext_socket_.get() != NULL); |
| 97 | ext_socket_->Connect(addr); |
| 98 | // TODO: handle errors here |
| 99 | } |
| 100 | |
| 101 | void ProxyBinding::OnInternalRead(AsyncSocket* socket) { |
| 102 | Read(int_socket_.get(), &out_buffer_); |
| 103 | Write(ext_socket_.get(), &out_buffer_); |
| 104 | } |
| 105 | |
| 106 | void ProxyBinding::OnInternalWrite(AsyncSocket* socket) { |
| 107 | Write(int_socket_.get(), &in_buffer_); |
| 108 | } |
| 109 | |
| 110 | void ProxyBinding::OnInternalClose(AsyncSocket* socket, int err) { |
| 111 | Destroy(); |
| 112 | } |
| 113 | |
| 114 | void ProxyBinding::OnExternalConnect(AsyncSocket* socket) { |
| 115 | ASSERT(socket != NULL); |
| 116 | connected_ = true; |
| 117 | int_socket_->SendConnectResult(0, socket->GetRemoteAddress()); |
| 118 | } |
| 119 | |
| 120 | void ProxyBinding::OnExternalRead(AsyncSocket* socket) { |
| 121 | Read(ext_socket_.get(), &in_buffer_); |
| 122 | Write(int_socket_.get(), &in_buffer_); |
| 123 | } |
| 124 | |
| 125 | void ProxyBinding::OnExternalWrite(AsyncSocket* socket) { |
| 126 | Write(ext_socket_.get(), &out_buffer_); |
| 127 | } |
| 128 | |
| 129 | void ProxyBinding::OnExternalClose(AsyncSocket* socket, int err) { |
| 130 | if (!connected_) { |
| 131 | int_socket_->SendConnectResult(err, SocketAddress()); |
| 132 | } |
| 133 | Destroy(); |
| 134 | } |
| 135 | |
| 136 | void ProxyBinding::Read(AsyncSocket* socket, FifoBuffer* buffer) { |
| 137 | // Only read if the buffer is empty. |
| 138 | ASSERT(socket != NULL); |
| 139 | size_t size; |
| 140 | int read; |
| 141 | if (buffer->GetBuffered(&size) && size == 0) { |
| 142 | void* p = buffer->GetWriteBuffer(&size); |
| 143 | read = socket->Recv(p, size); |
| 144 | buffer->ConsumeWriteBuffer(_max(read, 0)); |
| 145 | } |
| 146 | } |
| 147 | |
| 148 | void ProxyBinding::Write(AsyncSocket* socket, FifoBuffer* buffer) { |
| 149 | ASSERT(socket != NULL); |
| 150 | size_t size; |
| 151 | int written; |
| 152 | const void* p = buffer->GetReadData(&size); |
| 153 | written = socket->Send(p, size); |
| 154 | buffer->ConsumeReadData(_max(written, 0)); |
| 155 | } |
| 156 | |
| 157 | void ProxyBinding::Destroy() { |
| 158 | SignalDestroyed(this); |
| 159 | } |
| 160 | |
| 161 | } // namespace talk_base |