/// <summary>
/// Extract the address family from the saddr
/// </summary>
/// <param name="saddrHexString">Saddr hex dump</param>
/// <returns>LinuxAddressFamily type</returns>
public static LinuxAddressFamily ExtractFamilyFromSaddr(string saddrHexString)
{
var bytes = ByteExtensions.GetBytesFromFromHexString(saddrHexString);
int family = bytes[0];
return((LinuxAddressFamily)family);
}
/// <summary>
/// Decode a string that is presented in an encoded way
/// </summary>
/// <param name="encodedString">The encoded string in hex</param>
/// <param name="encoding">The text encoding to assume when decoding</param>
/// <returns></returns>
public static string DecodeHexStringIfNeeded(string encodedString, Encoding encoding)
{
//sometimes fields that should be encoded are not encoded because reasons ¯\_(ツ)_/¯
//in that case, just return the original string
if (NonHexRegex.IsMatch(encodedString) || IsNumberRegex.IsMatch(encodedString))
{
return(encodedString);
}
byte[] data = ByteExtensions.GetBytesFromFromHexString(encodedString);
string str = encoding.GetString(data);
return(str.Replace("\0", " "));
}
/// <summary>
/// The function parse the saddr structure used by Linux connect and accept APIs
/// It parses only saddr that represent INET or INET6 family type
/// </summary>
/// This function receives saddr in hex and translate it
/// Note: the translation will be done only if the family name is of type INET for other families null will be returned
/// <param name="saddrHexString">Saddr hex dump</param>
/// <returns>ConnectionSaddr</returns>
public static ConnectionSaddr ParseSaddrToInetConnection(string saddrHexString)
{
ConnectionSaddr retSaddr = null;
LinuxAddressFamily family = ExtractFamilyFromSaddr(saddrHexString);
// Saddr Template:
// 0-1 bytes - family,
// 2-3 bytes - port
// 4-7 byte - ip
//Extract port
var bytes = ByteExtensions.GetBytesFromFromHexString(saddrHexString);
var port = bytes.ToUshort(2, false);
if (family == LinuxAddressFamily.AF_INET)
{
var ip = bytes.Skip(4).Take(4);
retSaddr = new ConnectionSaddr
{
Ip = string.Join('.', ip),
Port = port
};
}
else if (family == LinuxAddressFamily.AF_INET6)
{
// Saddr for IPv6:
// 0-1 bytes - family,
// 2-3 bytes - port
// 4-7 byte - flowinfo
// 8-23 24 - ip
var ip = BitConverter.ToString(bytes.Skip(8).Take(16).ToArray()).Replace("-", "");
ip = Regex.Replace(ip, "(.{4})", "$1:");
ip = ip.Remove(ip.Length - 1, 1);
retSaddr = new ConnectionSaddr
{
Ip = ip,
Port = port
};
}
return(retSaddr);
}
