/// <inheritdoc/>
protected async override Task RequestConnectionAsync(NetworkStream nStream, byte command, string destinationHost, int destinationPort,
CancellationToken cancellationToken = default)
{
var dstPort = HostHelper.GetPortBytes(destinationPort);
var userId = Array.Empty <byte>();
if (Settings.Credentials != null && !string.IsNullOrEmpty(Settings.Credentials.UserName))
{
userId = Encoding.ASCII.GetBytes(Settings.Credentials.UserName);
}
var dstAddr = Encoding.ASCII.GetBytes(destinationHost);
// REQUEST GRANT
// +----+----+----+----+----+----+----+----+----+----+....+----+----+----+....+----+
// | VN | CD | DSTPORT | DSTIP | USERID |NULL| DSTADDR |NULL|
// +----+----+----+----+----+----+----+----+----+----+....+----+----+----+....+----+
// 1 1 2 4 variable 1 variable 1
var request = new byte[10 + userId.Length + dstAddr.Length];
request[0] = VersionNumber;
request[1] = command;
dstPort.CopyTo(request, 2);
byte[] dstIp = { 0, 0, 0, 1 };
dstIp.CopyTo(request, 4);
userId.CopyTo(request, 8);
request[8 + userId.Length] = 0x00;
dstAddr.CopyTo(request, 9 + userId.Length);
request[9 + userId.Length + dstAddr.Length] = 0x00;
await nStream.WriteAsync(request.AsMemory(0, request.Length), cancellationToken).ConfigureAwait(false);
// READ RESPONSE
// +----+----+----+----+----+----+----+----+
// | VN | CD | DSTPORT | DSTIP |
// +----+----+----+----+----+----+----+----+
// 1 1 2 4
var response = new byte[8];
await nStream.ReadAsync(response.AsMemory(0, 8), cancellationToken).ConfigureAwait(false);
var reply = response[1];
// Если запрос не выполнен.
if (reply != CommandReplyRequestGranted)
{
HandleCommandError(reply);
}
}
internal protected override void SendCommand(NetworkStream nStream, byte command, string destinationHost, int destinationPort)
{
byte[] dstPort = HostHelper.GetPortBytes(destinationPort);
byte[] dstIp = { 0, 0, 0, 1 };
byte[] userId = new byte[0];
if (Settings.Credentials != null)
{
if (!String.IsNullOrEmpty(Settings.Credentials.UserName))
{
userId = Encoding.ASCII.GetBytes(Settings.Credentials.UserName);
}
}
byte[] dstAddr = Encoding.ASCII.GetBytes(destinationHost);
// +----+----+----+----+----+----+----+----+----+----+....+----+----+----+....+----+
// | VN | CD | DSTPORT | DSTIP | USERID |NULL| DSTADDR |NULL|
// +----+----+----+----+----+----+----+----+----+----+....+----+----+----+....+----+
// 1 1 2 4 variable 1 variable 1
byte[] request = new byte[10 + userId.Length + dstAddr.Length];
request[0] = VersionNumber;
request[1] = command;
dstPort.CopyTo(request, 2);
dstIp.CopyTo(request, 4);
userId.CopyTo(request, 8);
request[8 + userId.Length] = 0x00;
dstAddr.CopyTo(request, 9 + userId.Length);
request[9 + userId.Length + dstAddr.Length] = 0x00;
nStream.Write(request, 0, request.Length);
// +----+----+----+----+----+----+----+----+
// | VN | CD | DSTPORT | DSTIP |
// +----+----+----+----+----+----+----+----+
// 1 1 2 4
byte[] response = new byte[8];
nStream.Read(response, 0, 8);
byte reply = response[1];
// Если запрос не выполнен.
if (reply != CommandReplyRequestGranted)
{
HandleCommandError(reply);
}
}
private static async Task RequestConnectionAsync(NetworkStream nStream, byte command, string destinationHost, int destinationPort,
CancellationToken cancellationToken = default)
{
var aTyp = GetAddressType(destinationHost);
var dstAddr = GetHostAddressBytes(aTyp, destinationHost);
var dstPort = HostHelper.GetPortBytes(destinationPort);
// REQUEST GRANT
// +----+-----+-------+------+----------+----------+
// |VER | CMD | RSV | ATYP | DST.ADDR | DST.PORT |
// +----+-----+-------+------+----------+----------+
// | 1 | 1 | X'00' | 1 | Variable | 2 |
// +----+-----+-------+------+----------+----------+
var request = new byte[4 + dstAddr.Length + 2];
request[0] = VersionNumber;
request[1] = command;
request[2] = Reserved;
request[3] = aTyp;
dstAddr.CopyTo(request, 4);
dstPort.CopyTo(request, 4 + dstAddr.Length);
await nStream.WriteAsync(request.AsMemory(0, request.Length), cancellationToken).ConfigureAwait(false);
// READ RESPONSE
// +----+-----+-------+------+----------+----------+
// |VER | REP | RSV | ATYP | BND.ADDR | BND.PORT |
// +----+-----+-------+------+----------+----------+
// | 1 | 1 | X'00' | 1 | Variable | 2 |
// +----+-----+-------+------+----------+----------+
var response = new byte[255];
await nStream.ReadAsync(response.AsMemory(0, response.Length), cancellationToken).ConfigureAwait(false);
var reply = response[1];
if (reply != CommandReplySucceeded)
{
HandleCommandError(reply);
}
}
private void SendCommand(NetworkStream nStream, byte command, string destinationHost, int destinationPort)
{
byte aTyp = GetAddressType(destinationHost);
byte[] dstAddr = HostHelper.GetHostAddressBytes(aTyp, destinationHost);
byte[] dstPort = HostHelper.GetPortBytes(destinationPort);
// +----+-----+-------+------+----------+----------+
// |VER | CMD | RSV | ATYP | DST.ADDR | DST.PORT |
// +----+-----+-------+------+----------+----------+
// | 1 | 1 | X'00' | 1 | Variable | 2 |
// +----+-----+-------+------+----------+----------+
byte[] request = new byte[4 + dstAddr.Length + 2];
request[0] = VersionNumber;
request[1] = command;
request[2] = Reserved;
request[3] = aTyp;
dstAddr.CopyTo(request, 4);
dstPort.CopyTo(request, 4 + dstAddr.Length);
nStream.Write(request, 0, request.Length);
// +----+-----+-------+------+----------+----------+
// |VER | REP | RSV | ATYP | BND.ADDR | BND.PORT |
// +----+-----+-------+------+----------+----------+
// | 1 | 1 | X'00' | 1 | Variable | 2 |
// +----+-----+-------+------+----------+----------+
byte[] response = new byte[255];
nStream.Read(response, 0, response.Length);
byte reply = response[1];
if (reply != CommandReplySucceeded)
{
HandleCommandError(reply);
}
}