public static int ValidMask(IPV4Address madr)
{
uint bit = 0x80000000;
int bitnum = 0;
for ( ; bitnum < 32; bitnum++)
{
uint nextbit = bit >> bitnum;
if ((nextbit & madr.address) == 0)
{
break;
}
}
if (bitnum >= 31)
{
Console.WriteLine("Invalid Mask. No bits left for host id");
return(0);
}
Console.WriteLine("Mask length {0,1} bits", bitnum);
for (bitnum++; bitnum < 32; bitnum++)
{
uint nextbit = bit >> bitnum;
if ((nextbit & madr.address) != 0)
{
Console.WriteLine("Invalid network mask. Expecting sequence of 0 bits");
return(0);
}
}
return(bitnum);
}
public void Show()
{
Console.WriteLine("IP Address {0,1} -----------------------------------------------", Image());
Console.WriteLine("Address Class: {0,1}", Class());
if (IsPrivate())
{
Console.WriteLine("Private address");
}
else
{
Console.WriteLine("Routable public address");
}
if (subnet_mask != null)
{
Console.WriteLine("Subnet Mask: {0,1}", subnet_mask.Image());
UInt32 network_id, host_id;
network_id = address & subnet_mask.address;
host_id = address ^ network_id;
IPV4Address network = new IPV4Address();
network.address = network_id;
Console.WriteLine("Network Id {0,1}", network.Image());
IPV4Address host = new IPV4Address();
host.address = host_id;
Console.WriteLine("Host Id {0,1}", host.address);
}
}
public bool SetMask(string mask)
{
if (subnet_bits != 0)
{
Console.WriteLine("Subnet mask already inferred to be {0,1} bits", subnet_bits);
return(false);
}
IPV4Address maskadr = new IPV4Address();
maskadr.Analyze(mask);
if (maskadr.subnet_bits > 0)
{
Console.WriteLine("Syntax error in mask address");
return(false);
}
int temp = ValidMask(maskadr);
if (temp == 0)
{
return(false);
}
subnet_mask = maskadr;
subnet_bits = temp;
return(true);
}
private void SetSubnetMaskBits(int snb)
{
uint mask = 0;
uint bit = 0x80000000;
for (int bitnum = 0; bitnum < snb; bitnum++)
{
uint nextbit = bit >> bitnum;
mask |= nextbit;
}
subnet_mask = new IPV4Address();
subnet_mask.address = mask;
}
static void Main(string[] args)
{
CommandLine.Version v = new CommandLine.Version(0, 1, 1, "ipadr");
Cli cli = new Cli();
cli.usage_text = "ipaddr v4|v6 <adr> [<mask>]";
cli.version = v;
cli.AddSubcommand("v4", "IPV4");
cli.AddSubcommand("v6", "IPV6");
cli.AddSwitch("m", "mask", "test operand - is valid subnet mask?", null, "false");
cli.Analyze(args);
if (cli.Present("help") || cli.Present("h"))
{
cli.Help();
}
if (cli.Present("m"))
{
Console.WriteLine("Mask validation");
string mval = cli.GetString("m");
Console.WriteLine("Mask value {0,0}", mval);
}
else
{
Console.WriteLine("No mask specified");
if (cli.Present("mask"))
{
Console.WriteLine("Mask value {0,0}", cli.GetString("mask"));
}
}
foreach (string op in cli.Operands())
{
Console.WriteLine("Operand {0,1}", op);
}
string sc = cli.subcommand;
IPAddress adr;
switch (sc)
{
case "v4":
bool bstat = false;
adr = new IPV4Address();
string[] cliargs = cli.Operands();
if (cliargs.Length >= 1)
{
adr = new IPV4Address();
bstat = adr.Analyze(cliargs[0]);
if (!bstat)
{
Console.WriteLine("Please provide a valid IP Address");
return;
}
if (cliargs.Length >= 2)
{
bstat = adr.SetMask(cliargs[1]);
if (!bstat)
{
Console.WriteLine("Invalid network mask");
return;
}
}
else
{
if (cli.Present("m"))
{
string mval = cli.GetString("m");
adr = new IPV4Address();
bstat = adr.Analyze(cliargs[0]);
if (!bstat)
{
Console.WriteLine("Invalid address for mask validation");
return;
}
int mlen = IPV4Address.ValidMask((IPV4Address)adr);
if (mlen > 0)
{
Console.WriteLine("Valid Mask");
return;
}
}
}
adr.Show();
}
break;
case "v6":
adr = new IPV6Address();
break;
default:
Console.WriteLine("Unrecognized subcommand {0,1}", sc);
return;
}
}