public void Connect(int aPort, IPAddress Ip, string userName, string password, string nick)
{
int attempts = 5;
_nick = nick;
// TODO: validar esse objeto, pois após a desconexão ocorre o dispose() dele
_clientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
while (!_clientSocket.Connected && attempts > 0)
{
try
{
OnRaiseMessage(new MessageEventArgs(String.Format("Attempt {0} to connect at server {1}:{2}", attempts, Ip.MapToIPv4().Address, aPort)));
_clientSocket.Connect(Ip ,aPort);
OnRaiseMessage(new MessageEventArgs("Connected!"));
//solicita autenticação
Authenticate(userName, password);
//inicia recebimento assíncrono de mensagens
_clientSocket.BeginReceive(_buffer, 0, _buffer.Length, SocketFlags.None, new AsyncCallback(ReceiveCallback), _clientSocket);
}
catch (Exception ex)
{
OnRaiseMessage(new MessageEventArgs("Connection failed."));
Thread.Sleep(1000);
attempts--;
}
}
}
private static string _ExtractNetworkId(IPAddress ipaddress)
{
var fam = ipaddress.AddressFamily == AddressFamily.InterNetwork;
var parts = ipaddress.MapToIPv4().ToString().Split(new[] {'.'}).Take(3);
var networkId = string.Join(".", parts);
return networkId;
}
private int ProcessSHandshake(Protocol _p)
{
Handshake.SHandshake p = (Handshake.SHandshake)_p;
if (DHContext.TryGetValue(p.Sender.SessionId, out var dhRandom))
{
Array.Reverse(p.Argument.dh_data);
byte[] material = Handshake.Helper.computeDHKey(
Config.HandshakeOptions.DhGroup,
new BigInteger(p.Argument.dh_data),
dhRandom).ToByteArray();
Array.Reverse(material);
System.Net.IPAddress ipaddress =
((IPEndPoint)p.Sender.Socket.RemoteEndPoint).Address;
if (ipaddress.IsIPv4MappedToIPv6)
{
ipaddress = ipaddress.MapToIPv4();
}
byte[] key = ipaddress.GetAddressBytes();
logger.Debug("{0} remoteip={1}", p.Sender.SessionId, BitConverter.ToString(key));
int half = material.Length / 2;
byte[] hmacMd5 = Digest.HmacMd5(key, material, 0, half);
p.Sender.SetOutputSecurityCodec(hmacMd5, p.Argument.c2sneedcompress);
hmacMd5 = Digest.HmacMd5(key, material, half, material.Length - half);
p.Sender.SetInputSecurityCodec(hmacMd5, p.Argument.s2cneedcompress);
DHContext.TryRemove(p.Sender.SessionId, out var _);
new Handshake.CHandshakeDone().Send(p.Sender);
OnHandshakeDone(p.Sender);
return(0);
}
throw new Exception("handshake lost context.");
}
private int ProcessCHandshake(Protocol _p)
{
Handshake.CHandshake p = (Handshake.CHandshake)_p;
int group = p.Argument.dh_group;
if (false == Config.HandshakeOptions.DhGroups.Contains(group))
{
p.Sender.Close(new Exception("dhGroup Not Supported"));
return(0);
}
Array.Reverse(p.Argument.dh_data);
BigInteger data = new BigInteger(p.Argument.dh_data);
BigInteger rand = Handshake.Helper.makeDHRandom();
byte[] material = Handshake.Helper.computeDHKey(group, data, rand).ToByteArray();
Array.Reverse(material);
System.Net.IPAddress ipaddress =
((IPEndPoint)p.Sender.Socket.LocalEndPoint).Address;
//logger.Debug(ipaddress);
if (ipaddress.IsIPv4MappedToIPv6)
{
ipaddress = ipaddress.MapToIPv4();
}
byte[] key = Config.HandshakeOptions.SecureIp != null
? Config.HandshakeOptions.SecureIp
: ipaddress.GetAddressBytes();
logger.Debug("{0} localip={1}", p.Sender.SessionId, BitConverter.ToString(key));
int half = material.Length / 2;
byte[] hmacMd5 = Digest.HmacMd5(key, material, 0, half);
p.Sender.SetInputSecurityCodec(hmacMd5, Config.HandshakeOptions.C2sNeedCompress);
byte[] response = Handshake.Helper.generateDHResponse(group, rand).ToByteArray();
Array.Reverse(response);
new Handshake.SHandshake(response,
Config.HandshakeOptions.S2cNeedCompress,
Config.HandshakeOptions.C2sNeedCompress)
.Send(p.Sender);
hmacMd5 = Digest.HmacMd5(key, material, half, material.Length - half);
p.Sender.SetOutputSecurityCodec(hmacMd5, Config.HandshakeOptions.S2cNeedCompress);
// 为了防止服务器在Handshake以后马上发送数据，
// 导致未加密数据和加密数据一起到达Client，这种情况很难处理。
// 这个本质上是协议相关的问题：就是前面一个协议的处理结果影响后面数据处理。
// 所以增加CHandshakeDone协议，在Client进入加密以后发送给Server。
// OnHandshakeDone(p.Sender);
return(0);
}
public bool IsLocal(IPAddress address)
{
if (_dict.ContainsKey(address))
return true;
if (IPAddress.IsLoopback(address))
return true;
if (address.IsIPv4MappedToIPv6)
{
var ip4 = address.MapToIPv4();
if (_dict.ContainsKey(ip4))
return true;
}
return false;
}
/// <summary>
/// An extension method to determine if an IP address is internal, as specified in RFC1918
/// </summary>
/// <param name="ip">The IP address that will be tested</param>
/// <returns>Returns true if the IP is internal, false if it is external</returns>
public static bool IsInternal(this System.Net.IPAddress ip)
{
if (ip.IsIPv4MappedToIPv6)
{
ip = ip.MapToIPv4();
}
if (ip.AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork)
{
byte[] bytes = ip.GetAddressBytes();
switch (bytes[0])
{
case 10:
case 127:
return(true);
case 172:
return(bytes[1] >= 16 && bytes[1] < 32);
case 192:
return(bytes[1] == 168);
default:
return(bytes[0] == 0 && bytes[1] == 0 && bytes[2] == 0 && bytes[3] == 0);
}
}
string addressAsString = ip.ToString();
string firstWord = addressAsString.Split(new[] { ':' }, StringSplitOptions.RemoveEmptyEntries)[0];
// equivalent of 127.0.0.1 in IPv6
if (addressAsString == "::1")
{
return(true);
}
// The original IPv6 Site Local addresses (fec0::/10) are deprecated. Unfortunately IsIPv6SiteLocal only checks for the original deprecated version:
else if (ip.IsIPv6SiteLocal)
{
return(true);
}
// These days Unique Local Addresses (ULA) are used in place of Site Local.
// ULA has two variants:
// fc00::/8 is not defined yet, but might be used in the future for internal-use addresses that are registered in a central place (ULA Central).
// fd00::/8 is in use and does not have to registered anywhere.
else if (firstWord.Length >= 4 && firstWord.Substring(0, 2) == "fc")
{
return(true);
}
else if (firstWord.Length >= 4 && firstWord.Substring(0, 2) == "fd")
{
return(true);
}
// Link local addresses (prefixed with fe80) are not routable
else if (firstWord == "fe80")
{
return(true);
}
// Discard Prefix
else if (firstWord == "100")
{
return(true);
}
// Any other IP address is not Unique Local Address (ULA)
return(false);
}
public static bool IsAddressPrivate(NetAddress address)
{
if (address.AddressFamily == AddressFamily.InterNetworkV6 && address.IsIPv4MappedToIPv6)
{
address = address.MapToIPv4();
}
if (address.AddressFamily == AddressFamily.InterNetwork)
{
byte[] bytes = address.GetAddressBytes();
return(bytes[0] == 10 ||
bytes[0] == 127 ||
(bytes[0] == 192 && bytes[1] == 168) ||
(bytes[0] == 172 && (bytes[1] >= 16 && bytes[1] <= 31)));
}
else if (address.AddressFamily == AddressFamily.InterNetworkV6)
{
string addressAsString = address.ToString();
// equivalent of 127.0.0.1 in IPv6
if (addressAsString == "::1")
{
return(true);
}
// The original IPv6 Site Local addresses (fec0::/10) are deprecated. Unfortunately IsIPv6SiteLocal only checks for the original deprecated version:
if (address.IsIPv6SiteLocal)
{
return(true);
}
int idx = addressAsString.IndexOf(':');
if (idx == -1)
{
return(false);
}
string firstWord = addressAsString.Substring(0, idx);
// These days Unique Local Addresses (ULA) are used in place of Site Local.
// ULA has two variants:
// fc00::/8 is not defined yet, but might be used in the future for internal-use addresses that are registered in a central place (ULA Central).
// fd00::/8 is in use and does not have to registered anywhere.
if (firstWord.Length >= 4 && firstWord.Substring(0, 2) == "fc")
{
return(true);
}
if (firstWord.Length >= 4 && firstWord.Substring(0, 2) == "fd")
{
return(true);
}
// Link local addresses (prefixed with fe80) are not routable
if (firstWord == "fe80")
{
return(true);
}
// Discard Prefix
if (firstWord == "100")
{
return(true);
}
// Any other IP address is not Unique Local Address (ULA)
return(false);
}
return(false);
}
