private int GetAutoProxies(Uri destination, Uri scriptLocation, out string proxyListString)
{
int num = 0;
var autoProxyOptions = new NativeMethods.WinHttp.WINHTTP_AUTOPROXY_OPTIONS();
autoProxyOptions.AutoLogonIfChallenged = false;
if (scriptLocation == null)
{
autoProxyOptions.Flags = NativeMethods.WinHttp.AutoProxyFlags.AutoDetect;
autoProxyOptions.AutoConfigUrl = null;
autoProxyOptions.AutoDetectFlags = NativeMethods.WinHttp.AutoDetectType.Dhcp | NativeMethods.WinHttp.AutoDetectType.DnsA;
}
else
{
autoProxyOptions.Flags = NativeMethods.WinHttp.AutoProxyFlags.AutoProxyConfigUrl;
autoProxyOptions.AutoConfigUrl = scriptLocation.ToString();
autoProxyOptions.AutoDetectFlags = NativeMethods.WinHttp.AutoDetectType.None;
}
if (!WinHttpGetProxyForUrl(destination.ToString(), ref autoProxyOptions, out proxyListString))
{
num = GetLastWin32Error();
if (num == (int)NativeMethods.WinHttp.ErrorCodes.LoginFailure && Credentials != null)
{
autoProxyOptions.AutoLogonIfChallenged = true;
if (!WinHttpGetProxyForUrl(destination.ToString(), ref autoProxyOptions, out proxyListString))
{
num = GetLastWin32Error();
}
}
}
return(num);
}
private bool winHttpGetProxyForUrl(string destination,
ref NativeMethods.WinHttp.WINHTTP_AUTOPROXY_OPTIONS autoProxyOptions, out string?proxyListString)
{
proxyListString = null;
bool flag;
var proxyInfo = new NativeMethods.WinHttp.WINHTTP_PROXY_INFO();
RuntimeHelpers.PrepareConstrainedRegions();
try
{
flag = NativeMethods.WinHttp.WinHttpGetProxyForUrl(session, destination, ref autoProxyOptions,
out proxyInfo);
if (flag)
{
proxyListString = Marshal.PtrToStringUni(proxyInfo.Proxy);
}
}
finally
{
Marshal.FreeHGlobal(proxyInfo.Proxy);
Marshal.FreeHGlobal(proxyInfo.ProxyBypass);
}
return(flag);
}