public static unsafe SocketError TryGetAddrInfo(string name, out IPHostEntry hostinfo, out int nativeErrorCode)
{
Interop.Sys.HostEntry *entry = null;
int result = Interop.Sys.GetHostEntriesForName(name, &entry);
if (result != 0)
{
hostinfo = NameResolutionUtilities.GetUnresolvedAnswer(name);
nativeErrorCode = result;
return(GetSocketErrorForNativeError(result));
}
try
{
string canonicalName = Marshal.PtrToStringAnsi((IntPtr)entry->CanonicalName);
hostinfo = new IPHostEntry
{
HostName = string.IsNullOrEmpty(canonicalName) ? name : canonicalName,
Aliases = Array.Empty <string>(),
AddressList = new IPAddress[entry->Count]
};
// Clean this up when fixing #3570
var buffer = new byte[SocketAddressPal.IPv6AddressSize];
for (int i = 0; i < entry->Count; i++)
{
SocketAddress sockaddr;
IPEndPoint factory;
int bufferLength;
if (entry->Addresses[i].IsIpv6)
{
sockaddr = new SocketAddress(AddressFamily.InterNetworkV6);
factory = IPEndPointStatics.IPv6Any;
bufferLength = SocketAddressPal.IPv6AddressSize;
SocketAddressPal.SetAddressFamily(buffer, AddressFamily.InterNetworkV6);
SocketAddressPal.SetIPv6Address(buffer, entry->Addresses[i].Address, entry->Addresses[i].Count, 0);
SocketAddressPal.SetPort(buffer, 0);
}
else
{
sockaddr = new SocketAddress(AddressFamily.InterNetwork);
factory = IPEndPointStatics.Any;
bufferLength = SocketAddressPal.IPv4AddressSize;
SocketAddressPal.SetAddressFamily(buffer, AddressFamily.InterNetwork);
SocketAddressPal.SetIPv4Address(buffer, entry->Addresses[i].Address);
SocketAddressPal.SetPort(buffer, 0);
}
for (int d = 0; d < bufferLength; d++)
{
sockaddr[d] = buffer[d];
}
hostinfo.AddressList[i] = ((IPEndPoint)factory.Create(sockaddr)).Address;
}
}
finally
{
Interop.Sys.FreeHostEntriesForName(entry);
}
nativeErrorCode = 0;
return(SocketError.Success);
}
private static unsafe IPAddress CreateIPv4Address(ReadOnlySpan <byte> socketAddress)
{
long address = (long)SocketAddressPal.GetIPv4Address(socketAddress) & 0x0FFFFFFFF;
return(new IPAddress(address));
}
internal SocketAddress(IPAddress ipaddress, int port)
: this(ipaddress)
{
SocketAddressPal.SetPort(Buffer, unchecked ((ushort)port));
}