public static unsafe IPHostEntry GetHostByAddr(IPAddress addr)
{
// TODO #2891: Optimize this (or decide if this legacy code can be removed):
byte[] addressBytes = addr.GetAddressBytes();
var address = new Interop.libc.in_addr { s_addr = unchecked((uint)BitConverter.ToInt32(addressBytes, 0)) };
int bufferSize = 512;
byte* stackBuffer = stackalloc byte[bufferSize];
var hostent = default(Interop.libc.hostent);
var result = (Interop.libc.hostent*)null;
if (TryGetHostByAddr(address, stackBuffer, bufferSize, &hostent, &result))
{
return CreateHostEntry(result);
}
for (; ;)
{
bufferSize *= 2;
fixed (byte* heapBuffer = new byte[bufferSize])
{
if (TryGetHostByAddr(address, heapBuffer, bufferSize, &hostent, &result))
{
return CreateHostEntry(result);
}
}
}
}
public static unsafe IPHostEntry GetHostByAddr(IPAddress addr)
{
// TODO #2891: Optimize this (or decide if this legacy code can be removed):
byte[] addressBytes = addr.GetAddressBytes();
var address = new Interop.libc.in_addr {
s_addr = unchecked ((uint)BitConverter.ToInt32(addressBytes, 0))
};
int bufferSize = 512;
byte *stackBuffer = stackalloc byte[bufferSize];
var hostent = default(Interop.libc.hostent);
var result = (Interop.libc.hostent *)null;
if (TryGetHostByAddr(address, stackBuffer, bufferSize, &hostent, &result))
{
return(CreateHostEntry(&hostent));
}
for (; ;)
{
bufferSize *= 2;
fixed(byte *heapBuffer = new byte[bufferSize])
{
if (TryGetHostByAddr(address, heapBuffer, bufferSize, &hostent, &result))
{
return(CreateHostEntry(&hostent));
}
}
}
}
public static unsafe IPHostEntry GetHostByAddr(IPAddress addr)
{
// TODO #2891: Optimize this (or decide if this legacy code can be removed):
byte[] addressBytes = addr.GetAddressBytes();
var address = new Interop.libc.in_addr { s_addr = unchecked((uint)BitConverter.ToInt32(addressBytes, 0)) };
Interop.libc.hostent* hostent = Interop.libc.gethostbyaddr(&address, (uint)sizeof(Interop.libc.in_addr), Interop.libc.AF_INET);
if (hostent == null)
{
int errno = Marshal.GetLastWin32Error();
throw new InternalSocketException(GetSocketErrorForErrno(errno), errno);
}
return CreateHostEntry(hostent);
}
private static unsafe bool TryGetHostByAddr(Interop.libc.in_addr address, byte *buffer, int bufferSize, Interop.libc.hostent *hostent, Interop.libc.hostent **result)
{
int errno;
int err = Interop.libc.gethostbyaddr_r(&address, (uint)sizeof(Interop.libc.in_addr), Interop.libc.AF_INET, hostent, buffer, (IntPtr)bufferSize, result, &errno);
switch (Interop.Sys.ConvertErrorPlatformToPal(err))
{
case 0:
return(true);
case Interop.Error.ERANGE:
return(false);
default:
throw new InternalSocketException(GetSocketErrorForErrno(errno), errno);
}
}
public static unsafe IPHostEntry GetHostByAddr(IPAddress addr)
{
// TODO #2891: Optimize this (or decide if this legacy code can be removed):
byte[] addressBytes = addr.GetAddressBytes();
var address = new Interop.libc.in_addr {
s_addr = unchecked ((uint)BitConverter.ToInt32(addressBytes, 0))
};
Interop.libc.hostent *hostent = Interop.libc.gethostbyaddr(&address, (uint)sizeof(Interop.libc.in_addr), Interop.libc.AF_INET);
if (hostent == null)
{
int errno = Marshal.GetLastWin32Error();
throw new InternalSocketException(GetSocketErrorForErrno(errno), errno);
}
return(CreateHostEntry(hostent));
}
