/// <summary>
/// Returns a collection containing the subnets of this collection given.
/// </summary>
/// <param name="source">The <see cref="Collection{IPObject}"/>.</param>
/// <returns>Collection{IPObject} object containing the subnets.</returns>
public static Collection <IPObject> AsNetworks(this Collection <IPObject> source)
{
if (source == null)
{
throw new ArgumentNullException(nameof(source));
}
Collection <IPObject> res = new Collection <IPObject>();
foreach (IPObject i in source)
{
if (i is IPNetAddress nw)
{
// Add the subnet calculated from the interface address/mask.
var na = nw.NetworkAddress;
na.Tag = i.Tag;
res.AddItem(na);
}
else if (i is IPHost ipHost)
{
// Flatten out IPHost and add all its ip addresses.
foreach (var addr in ipHost.GetAddresses())
{
IPNetAddress host = new IPNetAddress(addr)
{
Tag = i.Tag
};
res.AddItem(host);
}
}
}
return(res);
}
/// <summary>
/// Try to parse the address and subnet strings into an IPNetAddress object.
/// </summary>
/// <param name="addr">IP address to parse. Can be CIDR or X.X.X.X notation.</param>
/// <param name="ip">Resultant object.</param>
/// <returns>True if the values parsed successfully. False if not, resulting in the IP being null.</returns>
public static bool TryParse(string addr, out IPNetAddress ip)
{
if (!string.IsNullOrEmpty(addr))
{
addr = addr.Trim();
// Try to parse it as is.
if (IPAddress.TryParse(addr, out IPAddress? res))
{
ip = new IPNetAddress(res);
return(true);
}
// Is it a network?
string[] tokens = addr.Split('/');
if (tokens.Length == 2)
{
tokens[0] = tokens[0].TrimEnd();
tokens[1] = tokens[1].TrimStart();
if (IPAddress.TryParse(tokens[0], out res))
{
// Is the subnet part a cidr?
if (byte.TryParse(tokens[1], out byte cidr))
{
ip = new IPNetAddress(res, cidr);
return(true);
}
// Is the subnet in x.y.a.b form?
if (IPAddress.TryParse(tokens[1], out IPAddress? mask))
{
ip = new IPNetAddress(res, MaskToCidr(mask));
return(true);
}
}
}
}
ip = None;
return(false);
}
public static bool TryParse(string host, out IPHost hostObj)
{
if (string.IsNullOrWhiteSpace(host))
{
hostObj = IPHost.None;
return(false);
}
// See if it's an IPv6 with port address e.g. [::1] or [::1]:120.
int i = host.IndexOf(']', StringComparison.Ordinal);
if (i != -1)
{
return(TryParse(host.Remove(i - 1).TrimStart(' ', '['), out hostObj));
}
if (IPNetAddress.TryParse(host, out var netAddress))
{
// Host name is an ip address, so fake resolve.
hostObj = new IPHost(host, netAddress.Address);
return(true);
}
// Is it a host, IPv4/6 with/out port?
string[] hosts = host.Split(':');
if (hosts.Length <= 2)
{
// This is either a hostname: port, or an IP4:port.
host = hosts[0];
if (string.Equals("localhost", host, StringComparison.OrdinalIgnoreCase))
{
hostObj = new IPHost(host);
return(true);
}
if (IPAddress.TryParse(host, out var netIP))
{
// Host name is an ip address, so fake resolve.
hostObj = new IPHost(host, netIP);
return(true);
}
}
else
{
// Invalid host name, as it cannot contain :
hostObj = new IPHost(string.Empty, IPAddress.None);
return(false);
}
// Use regular expression as CheckHostName isn't RFC5892 compliant.
// Modified from gSkinner's expression at https://stackoverflow.com/questions/11809631/fully-qualified-domain-name-validation
string pattern = @"(?im)^(?!:\/\/)(?=.{1,255}$)((.{1,63}\.){0,127}(?![0-9]*$)[a-z0-9-]+\.?)$";
if (Regex.IsMatch(host, pattern))
{
hostObj = new IPHost(host);
return(true);
}
hostObj = IPHost.None;
return(false);
}
public static bool TryParse(string host, out IPHost hostObj)
{
if (!string.IsNullOrEmpty(host))
{
// See if it's an IPv6 with port address e.g. [::1]:120.
int i = host.IndexOf("]:", StringComparison.OrdinalIgnoreCase);
if (i != -1)
{
return(TryParse(host.Remove(i - 1).TrimStart(' ', '['), out hostObj));
}
else
{
// See if it's an IPv6 in [] with no port.
i = host.IndexOf(']', StringComparison.OrdinalIgnoreCase);
if (i != -1)
{
return(TryParse(host.Remove(i - 1).TrimStart(' ', '['), out hostObj));
}
// Is it a host or IPv4 with port?
string[] hosts = host.Split(':');
if (hosts.Length > 2)
{
hostObj = new IPHost(string.Empty, IPAddress.None);
return(false);
}
// Remove port from IPv4 if it exists.
host = hosts[0];
if (string.Equals("localhost", host, StringComparison.OrdinalIgnoreCase))
{
hostObj = new IPHost(host, new IPAddress(Ipv4Loopback));
return(true);
}
if (IPNetAddress.TryParse(host, out IPNetAddress netIP))
{
// Host name is an ip address, so fake resolve.
hostObj = new IPHost(host, netIP.Address);
return(true);
}
}
// Only thing left is to see if it's a host string.
if (!string.IsNullOrEmpty(host))
{
// Use regular expression as CheckHostName isn't RFC5892 compliant.
// Modified from gSkinner's expression at https://stackoverflow.com/questions/11809631/fully-qualified-domain-name-validation
Regex re = new Regex(@"^(?!:\/\/)(?=.{1,255}$)((.{1,63}\.){0,127}(?![0-9]*$)[a-z0-9-]+\.?)$", RegexOptions.IgnoreCase | RegexOptions.Multiline);
if (re.Match(host).Success)
{
hostObj = new IPHost(host);
return(true);
}
}
}
hostObj = IPHost.None;
return(false);
}
