private ProxyToken HandleConnectRequest(DataAdapterToStream stm)
{
ProxyToken ret = null;
int version = stm.ReadByte();
if (IsSupported(version))
{
if (version == 4)
{
_logger.LogVerbose(CANAPE.Net.Properties.Resources.SocksProxyServer_NewV4ConnectionLog);
ret = HandleSocksv4Request(stm);
}
else if (version == 5)
{
_logger.LogVerbose(CANAPE.Net.Properties.Resources.SocksProxyServer_NewV5ConnectionLog);
ret = HandleSocksv5Request(stm);
}
}
else
{
_logger.LogError(CANAPE.Net.Properties.Resources.SocksProxyServer_UnsupportedVersionLog, version);
}
return(ret);
}
private bool HandleV5Auth(DataAdapterToStream stm)
{
int authCount = stm.ReadByte();
bool foundAuth = false;
if (authCount > 0)
{
byte[] authModes = GeneralUtils.ReadBytes(stm, authCount);
foreach (byte b in authModes)
{
if (b == 0)
{
foundAuth = true;
break;
}
}
}
byte[] ret = new byte[2];
ret[0] = 5;
if (foundAuth)
{
ret[1] = 0;
}
else
{
ret[1] = 0xFF;
}
stm.Write(ret, 0, ret.Length);
return(foundAuth);
}
private ProxyToken HandleSocksv4Request(DataAdapterToStream stm)
{
SocksProxyToken ret = null;
int req = stm.ReadByte();
ushort port = ReadUShort(stm);
byte[] addrBytes = GeneralUtils.ReadBytes(stm, 4);
IPAddress addr = new IPAddress(addrBytes);
string addrName = addr.ToString();
// Discard username
ReadZString(stm);
if ((addrBytes[0] == 0) && (addrBytes[1] == 0) && (addrBytes[2] == 0) && (addrBytes[3] != 0))
{
StringBuilder builder = new StringBuilder();
_logger.LogVerbose(CANAPE.Net.Properties.Resources.SocksProxyServer_V4AUsed);
addrName = ReadZString(stm);
addr = null;
}
if (req == 1)
{
_logger.LogVerbose(CANAPE.Net.Properties.Resources.SocksProxyServer_V4ConnectionLog, addrName, port);
ret = new SocksProxyToken(addr, addrName, port, IpProxyToken.IpClientType.Tcp, false, stm, 4);
}
return(ret);
}
private ProxyToken HandleV5RequestData(DataAdapterToStream stm)
{
SocksProxyToken ret = null;
IPAddress addr = null;
string addrName = null;
bool ipv6 = false;
ushort port = 0;
int ver = stm.ReadByte();
int code = stm.ReadByte();
stm.ReadByte(); // Reserved
int type = stm.ReadByte();
if ((ver == 5) && (code == 1))
{
byte[] data = null;
switch (type)
{
case 1: // IPv4
{
data = GeneralUtils.ReadBytes(stm, 4);
addr = new IPAddress(data);
addrName = addr.ToString();
}
break;
case 3: // Domain name
{
int nameLen = stm.ReadByte();
if (nameLen > 0)
{
data = GeneralUtils.ReadBytes(stm, nameLen);
addrName = Encoding.ASCII.GetString(data);
}
}
break;
case 4: // IPv6
data = GeneralUtils.ReadBytes(stm, 16);
addr = new IPAddress(data);
addrName = addr.ToString();
ipv6 = true;
break;
default:
break;
}
port = ReadUShort(stm);
if ((addrName != null) && (port > 0))
{
_logger.LogVerbose(CANAPE.Net.Properties.Resources.SocksProxyServer_V5ConnectionLog, addrName, port);
ret = new SocksProxyToken(addr, addrName, port, IpProxyToken.IpClientType.Tcp, ipv6, stm, 5);
}
}
return(ret);
}