private unsafe static SocketError TryGetAddrInfo(string name, AddressInfoHints flags, out IPHostEntry hostinfo)
{
//
// Use SocketException here to show operation not supported
// if, by some nefarious means, this method is called on an
// unsupported platform.
//
#if FEATURE_PAL
throw new SocketException(SocketError.OperationNotSupported);
#else
SafeFreeAddrInfo root = null;
ArrayList addresses = new ArrayList();
string canonicalname = null;
AddressInfo hints = new AddressInfo();
hints.ai_flags = flags;
hints.ai_family = AddressFamily.Unspecified; // gets all address families
//
// Use try / finally so we always get a shot at freeaddrinfo
//
try {
SocketError errorCode = (SocketError)SafeFreeAddrInfo.GetAddrInfo(name, null, ref hints, out root);
if (errorCode != SocketError.Success) { // Should not throw, return mostly blank hostentry
hostinfo = new IPHostEntry();
hostinfo.HostName = name;
hostinfo.Aliases = new string[0];
hostinfo.AddressList = new IPAddress[0];
return errorCode;
}
AddressInfo* pAddressInfo = (AddressInfo*)root.DangerousGetHandle();
//
// Process the results
//
while (pAddressInfo!=null) {
SocketAddress sockaddr;
//
// Retrieve the canonical name for the host - only appears in the first AddressInfo
// entry in the returned array.
//
if (canonicalname==null && pAddressInfo->ai_canonname!=null) {
canonicalname = Marshal.PtrToStringUni((IntPtr)pAddressInfo->ai_canonname);
}
//
// Only process IPv4 or IPv6 Addresses. Note that it's unlikely that we'll
// ever get any other address families, but better to be safe than sorry.
// We also filter based on whether IPv6 is supported on the current
// platform / machine.
//
if ( ( pAddressInfo->ai_family == AddressFamily.InterNetwork ) || // Never filter v4
(pAddressInfo->ai_family == AddressFamily.InterNetworkV6 && Socket.OSSupportsIPv6))
{
sockaddr = new SocketAddress(pAddressInfo->ai_family, pAddressInfo->ai_addrlen);
//
// Push address data into the socket address buffer
//
for (int d = 0; d < pAddressInfo->ai_addrlen; d++) {
sockaddr.m_Buffer[d] = *(pAddressInfo->ai_addr + d);
}
//
// NOTE: We need an IPAddress now, the only way to create it from a
// SocketAddress is via IPEndPoint. This ought to be simpler.
//
if ( pAddressInfo->ai_family == AddressFamily.InterNetwork ) {
addresses.Add( ((IPEndPoint)IPEndPoint.Any.Create(sockaddr)).Address );
}
else {
addresses.Add( ((IPEndPoint)IPEndPoint.IPv6Any.Create(sockaddr)).Address );
}
}
//
// Next addressinfo entry
//
pAddressInfo = pAddressInfo->ai_next;
}
}
finally {
if (root != null) {
root.Close();
}
}
//
// Finally, put together the IPHostEntry
//
hostinfo = new IPHostEntry();
hostinfo.HostName = canonicalname!=null ? canonicalname : name;
hostinfo.Aliases = new string[0];
hostinfo.AddressList = new IPAddress[addresses.Count];
addresses.CopyTo(hostinfo.AddressList);
return SocketError.Success;
#endif // FEATURE_PAL
}
private static unsafe SocketError TryGetAddrInfo(string name, out IPHostEntry hostinfo)
{
if (!ComNetOS.IsPostWin2K)
{
throw new SocketException(SocketError.OperationNotSupported);
}
SafeFreeAddrInfo outAddrInfo = null;
ArrayList list = new ArrayList();
string str = null;
AddressInfo hints = new AddressInfo {
ai_flags = AddressInfoHints.AI_CANONNAME,
ai_family = AddressFamily.Unspecified
};
try
{
SocketError error = (SocketError)SafeFreeAddrInfo.GetAddrInfo(name, null, ref hints, out outAddrInfo);
if (error != SocketError.Success)
{
hostinfo = new IPHostEntry();
hostinfo.HostName = name;
hostinfo.Aliases = new string[0];
hostinfo.AddressList = new IPAddress[0];
return(error);
}
for (AddressInfo *infoPtr = (AddressInfo *)outAddrInfo.DangerousGetHandle(); infoPtr != null; infoPtr = infoPtr->ai_next)
{
if ((str == null) && (infoPtr->ai_canonname != null))
{
str = new string(infoPtr->ai_canonname);
}
if ((infoPtr->ai_family == AddressFamily.InterNetwork) || ((infoPtr->ai_family == AddressFamily.InterNetworkV6) && Socket.OSSupportsIPv6))
{
SocketAddress socketAddress = new SocketAddress(infoPtr->ai_family, infoPtr->ai_addrlen);
for (int i = 0; i < infoPtr->ai_addrlen; i++)
{
socketAddress.m_Buffer[i] = infoPtr->ai_addr[i];
}
if (infoPtr->ai_family == AddressFamily.InterNetwork)
{
list.Add(((IPEndPoint)IPEndPoint.Any.Create(socketAddress)).Address);
}
else
{
list.Add(((IPEndPoint)IPEndPoint.IPv6Any.Create(socketAddress)).Address);
}
}
}
}
finally
{
if (outAddrInfo != null)
{
outAddrInfo.Close();
}
}
hostinfo = new IPHostEntry();
hostinfo.HostName = (str != null) ? str : name;
hostinfo.Aliases = new string[0];
hostinfo.AddressList = new IPAddress[list.Count];
list.CopyTo(hostinfo.AddressList);
return(SocketError.Success);
}