/// <summary>
/// Extracts the computer name from the passed in dnsName. Note that if the dnsName is an
/// IP address, no conversion is performed. Also note that if the dnsName is a FQDN name, the
/// extracted computer name is not the same as the NetBIOS name, particularly in the case
/// that the computer name is longer than 15 characters (the limit for NetBios names).
/// </summary>
/// <param name="dnsName">The dnsName.</param>
/// <param name="parseOption">Used to specify whether it is ok if the dnsName is not the FQDN name.</param>
/// <returns>The extracted computer name.</returns>
public static string GetComputerName(string dnsName, DnsParseOption parseOption)
{
string computerName;
if (dnsName.IndexOf('.') == -1)
{
// No dot in the dnsName - assume computername is same as dnsName
computerName = dnsName;
if (parseOption == DnsParseOption.RequireFQDN)
{
throw new Exception(String.Format("Compute name {0} is invalid", dnsName));
}
}
else
{
IPAddress ipAddr;
if (IPAddress.TryParse(dnsName, out ipAddr))
{
// don't try to parse the IP
computerName = dnsName;
}
else
{
computerName = dnsName.Substring(0, dnsName.IndexOf('.'));
}
}
return(computerName);
}
public static string GetDomainName(string dnsName, DnsParseOption parseOption)
{
string domainName;
if (dnsName.IndexOf('.') == -1)
{
// No dot in the dnsName - assume domain name is the same as the dnsName
domainName = dnsName;
if (parseOption == DnsParseOption.RequireFQDN)
{
throw new Exception(String.Format("Computer name {0} is invalid", dnsName));
}
}
else
{
IPAddress ipAddr;
if (IPAddress.TryParse(dnsName, out ipAddr))
{
// there's no domain in case of IP
domainName = string.Empty;
}
else
{
domainName = dnsName.Substring(dnsName.IndexOf('.') + 1);
}
}
return(domainName);
}
