public static int PerformResize(string[] args)
{
if (args.Length != 3)
{
Program.UsageAndExit();
}
var ipv4CidrMatch = Program.IPv4WithCidrRegex.Match(args[1]);
var ipv4SubnetMatch = Program.IPv4WithSubnetRegex.Match(args[1]);
if (ipv4CidrMatch.Success || ipv4SubnetMatch.Success)
{
IPv4Network initialNet = (ipv4CidrMatch.Success)
? Program.ParseIPv4CidrSpec(ipv4CidrMatch)?.Item2
: Program.ParseIPv4SubnetSpec(ipv4SubnetMatch)?.Item2;
if (initialNet == null)
{
return(1);
}
int cidrPrefix;
IPv4Address newSubnetMask;
if (int.TryParse(args[2], NumberStyles.None, CultureInfo.InvariantCulture, out cidrPrefix))
{
if (cidrPrefix < 0 || cidrPrefix > 32)
{
Console.Error.WriteLine("IPv4 CIDR prefix {0} invalid; must be at last 0 and at most 32.", cidrPrefix);
return(1);
}
newSubnetMask = initialNet.BaseAddress.SubnetMaskFromCidrPrefix(cidrPrefix);
}
else
{
IPv4Address?maybeSubnetMask = IPv4Address.MaybeParse(args[2]);
if (!maybeSubnetMask.HasValue)
{
Console.Error.WriteLine("Invalid IPv4 CIDR prefix or subnet mask spec: {0}", args[2]);
return(1);
}
newSubnetMask = maybeSubnetMask.Value;
}
int netComparison;
List <IPNetwork <IPv4Address> > resized = ResizeNetwork(initialNet, newSubnetMask,
(addr, mask) => new IPv4Network(addr, mask), out netComparison);
Console.WriteLine("Original network:");
ShowNet.OutputIPv4Network(initialNet);
Console.WriteLine();
if (netComparison < 0)
{
Console.WriteLine("Supernet:");
ShowNet.OutputIPv4Network(resized[0]);
Console.WriteLine();
}
else if (netComparison == 0)
{
Console.WriteLine("Same-sized net:");
ShowNet.OutputIPv4Network(resized[0]);
Console.WriteLine();
}
else
{
for (int i = 0; i < resized.Count; ++i)
{
Console.WriteLine("Subnet {0}:", i + 1);
ShowNet.OutputIPv4Network(resized[i]);
Console.WriteLine();
}
}
return(0);
}
var ipv6CidrMatch = Program.IPv6WithCidrRegex.Match(args[1]);
var ipv6SubnetMatch = Program.IPv6WithCidrRegex.Match(args[1]);
if (ipv6CidrMatch.Success || ipv6SubnetMatch.Success)
{
IPv6Network initialNet = (ipv6CidrMatch.Success)
? Program.ParseIPv6CidrSpec(ipv6CidrMatch)?.Item2
: Program.ParseIPv6SubnetSpec(ipv6SubnetMatch)?.Item2;
if (initialNet == null)
{
return(1);
}
int cidrPrefix;
IPv6Address newSubnetMask;
if (int.TryParse(args[2], NumberStyles.None, CultureInfo.InvariantCulture, out cidrPrefix))
{
if (cidrPrefix < 0 || cidrPrefix > 128)
{
Console.Error.WriteLine("IPv6 CIDR prefix {0} invalid; must be at last 0 and at most 128.", cidrPrefix);
return(1);
}
newSubnetMask = initialNet.BaseAddress.SubnetMaskFromCidrPrefix(cidrPrefix);
}
else
{
IPv6Address?maybeSubnetMask = IPv6Address.MaybeParse(args[2]);
if (!maybeSubnetMask.HasValue)
{
Console.Error.WriteLine("Invalid IPv6 CIDR prefix or subnet mask spec: {0}", args[2]);
return(1);
}
newSubnetMask = maybeSubnetMask.Value;
}
int netComparison;
List <IPNetwork <IPv6Address> > resized = ResizeNetwork(initialNet, newSubnetMask,
(addr, mask) => new IPv6Network(addr, mask), out netComparison);
Console.WriteLine("Original network:");
ShowNet.OutputIPv6Network(initialNet);
Console.WriteLine();
if (netComparison < 0)
{
Console.WriteLine("Supernet:");
ShowNet.OutputIPv6Network(resized[0]);
Console.WriteLine();
}
else if (netComparison == 0)
{
Console.WriteLine("Same-sized net:");
ShowNet.OutputIPv6Network(resized[0]);
Console.WriteLine();
}
else
{
for (int i = 0; i < resized.Count; ++i)
{
Console.WriteLine("Subnet {0}:", i + 1);
ShowNet.OutputIPv6Network(resized[i]);
Console.WriteLine();
}
}
return(0);
}
Console.Error.WriteLine("Could not detect network spec type of {0}.", args[1]);
return(1);
}