public Device GetByIPAddress( string ipAddress, int deviceTypeValueId, bool skipReverseLookup = true )
{
string hostValue = ipAddress;
if ( !skipReverseLookup )
{
// Lookup the system's "name" (as seen in the DNS) using the given IP
// address because when using DHCP the kiosk may have a different IP from time to time
// -- however the fully qualified name should always be the same.
try
{
hostValue = System.Net.Dns.GetHostEntry( ipAddress ).HostName;
}
catch ( SocketException )
{
// TODO: consider whether we want to log the IP address that caused this error.
// As per http://msdn.microsoft.com/en-us/library/ms143998.aspx it *may* mean
// a stale DNS record for an IPv4 address that actually belongs to a
// different host was going to be returned (there is a DNS PTR record for
// the IPv4 address, but no DNS A record for the IPv4 address).
hostValue = ipAddress;
}
}
Device device = null;
// If we still have an IPv4 address then try to find it based on IP
if ( Regex.IsMatch( hostValue, @"\d+\.\d+\.\d+\.\d+" ) )
{
// find by IP
device = Queryable()
.Where( d =>
d.DeviceTypeValueId == deviceTypeValueId &&
d.IPAddress == hostValue)
.FirstOrDefault();
}
else
{
// find by name
device = Queryable()
.Where( d =>
d.DeviceTypeValueId == deviceTypeValueId &&
d.Name == hostValue )
.FirstOrDefault();
}
return device;
}
