| | | 1 | | // Copyright (c) ZeroC, Inc. |
| | | 2 | | |
| | | 3 | | using System.Diagnostics; |
| | | 4 | | using System.Net; |
| | | 5 | | using System.Net.Sockets; |
| | | 6 | | using System.Text; |
| | | 7 | | |
| | | 8 | | namespace Ice.Internal; |
| | | 9 | | |
| | | 10 | | public interface NetworkProxy |
| | | 11 | | { |
| | | 12 | | // |
| | | 13 | | // Write the connection request on the connection established |
| | | 14 | | // with the network proxy server. This is called right after |
| | | 15 | | // the connection establishment succeeds. |
| | | 16 | | // |
| | | 17 | | void beginWrite(EndPoint endpoint, Buffer buf); |
| | | 18 | | |
| | | 19 | | int endWrite(Buffer buf); |
| | | 20 | | |
| | | 21 | | // |
| | | 22 | | // Once the connection request has been sent, this is called |
| | | 23 | | // to prepare and read the response from the proxy server. |
| | | 24 | | // |
| | | 25 | | void beginRead(Buffer buf); |
| | | 26 | | |
| | | 27 | | int endRead(Buffer buf); |
| | | 28 | | |
| | | 29 | | // |
| | | 30 | | // This is called when the response from the proxy has been |
| | | 31 | | // read. The proxy should copy the extra read data (if any) in the |
| | | 32 | | // given byte vector. |
| | | 33 | | // |
| | | 34 | | void finish(Buffer readBuffer, Buffer writeBuffer); |
| | | 35 | | |
| | | 36 | | // |
| | | 37 | | // If the proxy host needs to be resolved, this should return |
| | | 38 | | // a new NetworkProxy containing the IP address of the proxy. |
| | | 39 | | // This is called from the endpoint host resolver thread, so |
| | | 40 | | // it's safe if this this method blocks. |
| | | 41 | | // |
| | | 42 | | NetworkProxy resolveHost(int protocolSupport); |
| | | 43 | | |
| | | 44 | | // |
| | | 45 | | // Returns the IP address of the network proxy. This method |
| | | 46 | | // must not block. It's only called on a network proxy object |
| | | 47 | | // returned by resolveHost(). |
| | | 48 | | // |
| | | 49 | | EndPoint getAddress(); |
| | | 50 | | |
| | | 51 | | // |
| | | 52 | | // Returns the name of the proxy, used for tracing purposes. |
| | | 53 | | // |
| | | 54 | | string getName(); |
| | | 55 | | |
| | | 56 | | // |
| | | 57 | | // Returns the protocols supported by the proxy. |
| | | 58 | | // |
| | | 59 | | int getProtocolSupport(); |
| | | 60 | | } |
| | | 61 | | |
| | | 62 | | public sealed class SOCKSNetworkProxy : NetworkProxy |
| | | 63 | | { |
| | | 64 | | public SOCKSNetworkProxy(string host, int port) |
| | | 65 | | { |
| | | 66 | | _host = host; |
| | | 67 | | _port = port; |
| | | 68 | | } |
| | | 69 | | |
| | | 70 | | private SOCKSNetworkProxy(EndPoint address) => _address = address; |
| | | 71 | | |
| | | 72 | | public void beginWrite(EndPoint endpoint, Buffer buf) |
| | | 73 | | { |
| | | 74 | | if (!(endpoint is IPEndPoint)) |
| | | 75 | | { |
| | | 76 | | throw new FeatureNotSupportedException("SOCKS4 does not support domain names."); |
| | | 77 | | } |
| | | 78 | | else if (endpoint.AddressFamily != AddressFamily.InterNetwork) |
| | | 79 | | { |
| | | 80 | | throw new FeatureNotSupportedException("SOCKS4 only supports IPv4 addresses."); |
| | | 81 | | } |
| | | 82 | | |
| | | 83 | | // |
| | | 84 | | // SOCKS connect request |
| | | 85 | | // |
| | | 86 | | var addr = (IPEndPoint)endpoint; |
| | | 87 | | buf.resize(9, false); |
| | | 88 | | ByteBuffer.ByteOrder order = buf.b.order(); |
| | | 89 | | buf.b.order(ByteBuffer.ByteOrder.BigEndian); // Network byte order. |
| | | 90 | | buf.b.position(0); |
| | | 91 | | buf.b.put(0x04); // SOCKS version 4. |
| | | 92 | | buf.b.put(0x01); // Command, establish a TCP/IP stream connection |
| | | 93 | | buf.b.putShort((short)addr.Port); // Port |
| | | 94 | | buf.b.put(addr.Address.GetAddressBytes()); // IPv4 address |
| | | 95 | | buf.b.put(0x00); // User ID. |
| | | 96 | | buf.b.position(0); |
| | | 97 | | buf.b.limit(buf.size()); |
| | | 98 | | buf.b.order(order); |
| | | 99 | | } |
| | | 100 | | |
| | | 101 | | public int endWrite(Buffer buf) => |
| | | 102 | | // Once the request is sent, read the response |
| | | 103 | | buf.b.hasRemaining() ? SocketOperation.Write : SocketOperation.Read; |
| | | 104 | | |
| | | 105 | | public void beginRead(Buffer buf) |
| | | 106 | | { |
| | | 107 | | // |
| | | 108 | | // Read the SOCKS4 response whose size is 8 bytes. |
| | | 109 | | // |
| | | 110 | | buf.resize(8, true); |
| | | 111 | | buf.b.position(0); |
| | | 112 | | } |
| | | 113 | | |
| | | 114 | | public int endRead(Buffer buf) => |
| | | 115 | | // We're done once we read the response |
| | | 116 | | buf.b.hasRemaining() ? SocketOperation.Read : SocketOperation.None; |
| | | 117 | | |
| | | 118 | | public void finish(Buffer readBuffer, Buffer writeBuffer) |
| | | 119 | | { |
| | | 120 | | readBuffer.b.position(0); |
| | | 121 | | byte b1 = readBuffer.b.get(); |
| | | 122 | | byte b2 = readBuffer.b.get(); |
| | | 123 | | if (b1 != 0x00 || b2 != 0x5a) |
| | | 124 | | { |
| | | 125 | | throw new Ice.ConnectFailedException(); |
| | | 126 | | } |
| | | 127 | | } |
| | | 128 | | |
| | | 129 | | public NetworkProxy resolveHost(int protocolSupport) |
| | | 130 | | { |
| | | 131 | | Debug.Assert(_host != null); |
| | | 132 | | return new SOCKSNetworkProxy(Network.getAddresses( |
| | | 133 | | _host, |
| | | 134 | | _port, |
| | | 135 | | protocolSupport, |
| | | 136 | | false, |
| | | 137 | | true)[0]); |
| | | 138 | | } |
| | | 139 | | |
| | | 140 | | public EndPoint getAddress() |
| | | 141 | | { |
| | | 142 | | Debug.Assert(_address != null); // Host must be resolved. |
| | | 143 | | return _address; |
| | | 144 | | } |
| | | 145 | | |
| | | 146 | | public string getName() => "SOCKS"; |
| | | 147 | | |
| | | 148 | | public int getProtocolSupport() => Network.EnableIPv4; |
| | | 149 | | |
| | | 150 | | private readonly string _host; |
| | | 151 | | private readonly int _port; |
| | | 152 | | private readonly EndPoint _address; |
| | | 153 | | } |
| | | 154 | | |
| | | 155 | | public sealed class HTTPNetworkProxy : NetworkProxy |
| | | 156 | | { |
| | 1 | 157 | | public HTTPNetworkProxy(string host, int port) |
| | | 158 | | { |
| | 1 | 159 | | _host = host; |
| | 1 | 160 | | _port = port; |
| | 1 | 161 | | _protocolSupport = Network.EnableBoth; |
| | 1 | 162 | | } |
| | | 163 | | |
| | 1 | 164 | | private HTTPNetworkProxy(EndPoint address, int protocolSupport) |
| | | 165 | | { |
| | 1 | 166 | | _address = address; |
| | 1 | 167 | | _protocolSupport = protocolSupport; |
| | 1 | 168 | | } |
| | | 169 | | |
| | | 170 | | public void beginWrite(EndPoint endpoint, Buffer buf) |
| | | 171 | | { |
| | 1 | 172 | | string addr = Network.addrToString(endpoint); |
| | 1 | 173 | | var str = new StringBuilder(); |
| | 1 | 174 | | str.Append("CONNECT "); |
| | 1 | 175 | | str.Append(addr); |
| | 1 | 176 | | str.Append(" HTTP/1.1\r\nHost: "); |
| | 1 | 177 | | str.Append(addr); |
| | 1 | 178 | | str.Append("\r\n\r\n"); |
| | 1 | 179 | | byte[] b = System.Text.Encoding.ASCII.GetBytes(str.ToString()); |
| | | 180 | | |
| | | 181 | | // |
| | | 182 | | // HTTP connect request |
| | | 183 | | // |
| | 1 | 184 | | buf.resize(b.Length, false); |
| | 1 | 185 | | buf.b.position(0); |
| | 1 | 186 | | buf.b.put(b); |
| | 1 | 187 | | buf.b.position(0); |
| | 1 | 188 | | buf.b.limit(buf.size()); |
| | 1 | 189 | | } |
| | | 190 | | |
| | | 191 | | public int endWrite(Buffer buf) => |
| | | 192 | | // Once the request is sent, read the response |
| | 1 | 193 | | buf.b.hasRemaining() ? SocketOperation.Write : SocketOperation.Read; |
| | | 194 | | |
| | | 195 | | public void beginRead(Buffer buf) |
| | | 196 | | { |
| | | 197 | | // |
| | | 198 | | // Read the HTTP response |
| | | 199 | | // |
| | 1 | 200 | | buf.resize(7, true); // Enough space for reading at least HTTP1.1 |
| | 1 | 201 | | buf.b.position(0); |
| | 1 | 202 | | } |
| | | 203 | | |
| | | 204 | | public int endRead(Buffer buf) |
| | | 205 | | { |
| | | 206 | | // |
| | | 207 | | // Check if we received the full HTTP response, if not, continue |
| | | 208 | | // reading otherwise we're done. |
| | | 209 | | // |
| | 1 | 210 | | int end = new HttpParser().isCompleteMessage(buf.b, 0, buf.b.position()); |
| | 1 | 211 | | if (end < 0 && !buf.b.hasRemaining()) |
| | | 212 | | { |
| | | 213 | | // |
| | | 214 | | // Read one more byte, we can't easily read bytes in advance |
| | | 215 | | // since the transport implenentation might be be able to read |
| | | 216 | | // the data from the memory instead of the socket. |
| | | 217 | | // |
| | 1 | 218 | | buf.resize(buf.size() + 1, true); |
| | 1 | 219 | | return SocketOperation.Read; |
| | | 220 | | } |
| | 1 | 221 | | return SocketOperation.None; |
| | | 222 | | } |
| | | 223 | | |
| | | 224 | | public void finish(Buffer readBuffer, Buffer writeBuffer) |
| | | 225 | | { |
| | 1 | 226 | | var parser = new HttpParser(); |
| | 1 | 227 | | parser.parse(readBuffer.b, 0, readBuffer.b.position()); |
| | 1 | 228 | | if (parser.status() != 200) |
| | | 229 | | { |
| | 1 | 230 | | throw new Ice.ConnectFailedException(); |
| | | 231 | | } |
| | 1 | 232 | | } |
| | | 233 | | |
| | | 234 | | public NetworkProxy resolveHost(int protocolSupport) |
| | | 235 | | { |
| | | 236 | | Debug.Assert(_host != null); |
| | 1 | 237 | | return new HTTPNetworkProxy( |
| | 1 | 238 | | Network.getAddresses( |
| | 1 | 239 | | _host, |
| | 1 | 240 | | _port, |
| | 1 | 241 | | protocolSupport, |
| | 1 | 242 | | false, |
| | 1 | 243 | | true)[0], |
| | 1 | 244 | | protocolSupport); |
| | | 245 | | } |
| | | 246 | | |
| | | 247 | | public EndPoint getAddress() |
| | | 248 | | { |
| | | 249 | | Debug.Assert(_address != null); // Host must be resolved. |
| | 1 | 250 | | return _address; |
| | | 251 | | } |
| | | 252 | | |
| | 1 | 253 | | public string getName() => "HTTP"; |
| | | 254 | | |
| | 1 | 255 | | public int getProtocolSupport() => _protocolSupport; |
| | | 256 | | |
| | | 257 | | private readonly string _host; |
| | | 258 | | private readonly int _port; |
| | | 259 | | private readonly EndPoint _address; |
| | | 260 | | private readonly int _protocolSupport; |
| | | 261 | | } |