public static IPAddress[] ParseIpAddress(IPAddress ip)
{
#if UNITY_EDITOR
return(DnsBase.GetHostAddresses(ip.ToString()));
#elif UNITY_IPHONE
return(new IPAddress[] { IPAddress.Parse(getIPv6(ip.ToString())) });
#else
return(DnsBase.GetHostAddresses(ip.ToString()));
#endif
}
public static IPAddress[] Lookup(string hostname)
{
IPAddress addr;
if (IPAddress.TryParse(hostname, out addr))
{
return(ParseIpAddress(addr));
}
// safe read
IPAddress[] addres = GetAddresses(hostname);
if (addres != null)
{
return(addres);
}
// try to get the host entries
List <IPAddress> addresses = new List <IPAddress>();
try
{
var async = DnsBase.BeginGetHostAddresses(hostname, null, null);
if (async.AsyncWaitHandle.WaitOne(System.TimeSpan.FromSeconds(5)) && async.IsCompleted)
{
var tmp = DnsBase.EndGetHostAddresses(async);
if (tmp != null)
{
// shuffle
if (tmp.Length > 1)
{
System.Random rand = new System.Random();
for (int i = 0; i < tmp.Length; ++i)
{
var t = tmp[i];
int r = rand.Next(i, tmp.Length);
tmp[i] = tmp[r];
tmp[r] = t;
}
}
// support ipv6
if (TcpClientUtil.OSSupportsIPv6())
{
foreach (var ip in tmp)
{
if (ip.AddressFamily == System.Net.Sockets.AddressFamily.InterNetworkV6)
{
addresses.Add(ip);
}
}
}
// ipv4
if (TcpClientUtil.OSSupportsIPv4())
{
foreach (var ip in tmp)
{
if (ip.AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork)
{
//Debug.Log("addr " + ip);
addresses.Add(ip);
}
}
}
}
}
}
catch (System.Exception ex)
{
// failure,
EB.Debug.LogError("failed to lookup " + hostname + " " + ex);
}
// fall back
if (addresses.Count == 0 && s_fallbackDNS.ContainsKey(hostname))
{
EB.Debug.LogWarning("failed to lookup {0}, use fall back dns", hostname);
addresses.AddRange(s_fallbackDNS[hostname]);
return(addresses.ToArray());
}
// not found
if (addresses.Count == 0)
{
EB.Debug.LogError("failed to lookup {0}", hostname);
return(new IPAddress[0]);
}
// safe update
Entry e = GetEntry(hostname);
lock (e)
{
e.addresses = addresses.ToArray();
// keep last in first
if (e.last != null)
{
var index = System.Array.IndexOf(e.addresses, e.last);
if (index >= 0)
{
// move to the front
var tmp = e.addresses[0];
e.addresses[0] = e.addresses[index];
e.addresses[index] = tmp;
}
}
else
{
e.last = e.addresses[0];
}
return((IPAddress[])e.addresses.Clone());
}
}
