/// <param name="dstAddr">domain or IPv4</param>
public AddrField(string dstAddr)
{
dstAddr = Guard.NotNullOrEmptyOrWhitespace(nameof(dstAddr), dstAddr, true);
var atyp = new AtypField();
atyp.FromDstAddr(dstAddr);
Atyp = atyp;
byte[] bytes;
if (atyp == AtypField.DomainName)
{
// https://www.ietf.org/rfc/rfc1928.txt
// the address field contains a fully-qualified domain name. The first
// octet of the address field contains the number of octets of name that
// follow, there is no terminating NUL octet.
var domainBytes = Encoding.ASCII.GetBytes(dstAddr); // Tor only knows ASCII, UTF8 results in general SOCKS server failure
var numberOfOctets = domainBytes.Length;
if (numberOfOctets > 255)
{
throw new FormatException($"{nameof(dstAddr)} can be maximum 255 octets. Actual: {numberOfOctets} octets. Value: {dstAddr}.");
}
bytes = ByteHelpers.Combine(new byte[] { (byte)numberOfOctets }, domainBytes);
}
else if (atyp == AtypField.IPv4)
{
// the address is a version-4 IP address, with a length of 4 octets
var parts = dstAddr.Split(".", StringSplitOptions.RemoveEmptyEntries);
if (parts.Length != 4 || parts.Any(string.IsNullOrWhiteSpace))
{
throw new FormatException($"{nameof(dstAddr)} must be have 4 parts. Actual: {parts.Length} parts. Value: {dstAddr}.");
}
bytes = new byte[4];
for (int i = 0; i < 4; i++)
{
if (int.TryParse(parts[i], out int partInt))
{
if (partInt < 0 || partInt > 255)
{
throw new FormatException($"Every part of {nameof(dstAddr)} must be between 0 and 255. The {i}. part is invalid: {partInt}. Value of {nameof(dstAddr)}: {dstAddr}");
}
bytes[i] = (byte)partInt;
}
else
{
throw new FormatException($"Could not parse the {i}. part of {nameof(dstAddr)} to int. Invalid part: {partInt}. Value of {nameof(dstAddr)}: {dstAddr}.");
}
}
}
else
{
throw new NotSupportedException($"{nameof(atyp)} is not supported. Value: {atyp}.");
}
Bytes = bytes;
}
public TorSocks5Request(byte[] bytes)
{
Guard.NotNullOrEmpty(nameof(bytes), bytes);
Guard.MinimumAndNotNull($"{nameof(bytes)}.{nameof(bytes.Length)}", bytes.Length, 6);
Ver = new VerField(bytes[0]);
Cmd = new CmdField(bytes[1]);
Rsv = new RsvField(bytes[2]);
Atyp = new AtypField(bytes[3]);
DstAddr = new AddrField(bytes[4..^ 2]);
public TorSocks5Response(byte[] bytes)
{
Guard.NotNullOrEmpty(nameof(bytes), bytes);
Guard.MinimumAndNotNull($"{nameof(bytes)}.{nameof(bytes.Length)}", bytes.Length, smallest: 6);
Ver = new VerField(bytes[0]);
Rep = new RepField(bytes[1]);
Rsv = new RsvField(bytes[2]);
Atyp = new AtypField(bytes[3]);
BndAddr = new AddrField(bytes[4..^ 2]);
public override void FromBytes(byte[] bytes)
{
Guard.NotNullOrEmpty(nameof(bytes), bytes);
Guard.MinimumAndNotNull($"{nameof(bytes)}.{nameof(bytes.Length)}", bytes.Length, 6);
Ver = new VerField(bytes[0]);
Rep = new RepField();
Rep.FromByte(bytes[1]);
Rsv = new RsvField();
Rsv.FromByte(bytes[2]);
Atyp = new AtypField(bytes[3]);
BndAddr = new AddrField();
BndAddr.FromBytes(bytes[4..^ 2]);
public override void FromBytes(byte[] bytes)
{
Guard.NotNullOrEmpty(nameof(bytes), bytes);
Guard.MinimumAndNotNull($"{nameof(bytes)}.{nameof(bytes.Length)}", bytes.Length, 6);
Ver = new VerField();
Ver.FromByte(bytes[0]);
Cmd = new CmdField();
Cmd.FromByte(bytes[1]);
Rsv = new RsvField();
Rsv.FromByte(bytes[2]);
Atyp = new AtypField();
Atyp.FromByte(bytes[3]);
DstAddr = new AddrField();
DstAddr.FromBytes(bytes.Skip(4).Take(bytes.Length - 4 - 2).ToArray());
DstPort = new PortField();
DstPort.FromBytes(bytes.Skip(bytes.Length - 2).ToArray());
}
