Include description of SOCKS error in exception.

parent be3752bf
......@@ -12,6 +12,18 @@ import java.net.SocketAddress;
class SocksSocket extends Socket {
private static final String[] ERRORS = {
"Succeeded",
"General SOCKS server failure",
"Connection not allowed by ruleset",
"Network unreachable",
"Host unreachable",
"Connection refused",
"TTL expired",
"Command not supported",
"Address type not supported"
};
private final SocketAddress proxy;
private final int connectToProxyTimeout;
......@@ -93,13 +105,16 @@ class SocksSocket extends Socket {
private void receiveConnectResponse(InputStream in) throws IOException {
byte[] connectResponse = new byte[4];
IoUtils.read(in, connectResponse);
byte version = connectResponse[0];
byte reply = connectResponse[1];
byte addressType = connectResponse[3];
int version = connectResponse[0] & 0xFF;
int reply = connectResponse[1] & 0xFF;
int addressType = connectResponse[3] & 0xFF;
if (version != 5)
throw new IOException("Unsupported SOCKS version: " + version);
if (reply != 0)
throw new IOException("Connection failed: " + reply);
if (reply != 0) {
if (reply < ERRORS.length)
throw new IOException("Connection failed: " + ERRORS[reply]);
else throw new IOException("Connection failed: " + reply);
}
if (addressType == 1) IoUtils.read(in, new byte[4]); // IPv4
else if (addressType == 4) IoUtils.read(in, new byte[16]); // IPv6
else throw new IOException("Unsupported address type: " + addressType);
......
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