private bool WinHttpGetProxyForUrl(string destination,
ref UnsafeNclNativeMethods.WinHttp.WINHTTP_AUTOPROXY_OPTIONS autoProxyOptions,
out string proxyListString)
{
proxyListString = null;
bool success = false;
UnsafeNclNativeMethods.WinHttp.WINHTTP_PROXY_INFO proxyInfo =
new UnsafeNclNativeMethods.WinHttp.WINHTTP_PROXY_INFO();
// Make sure the strings get cleaned up in a CER (thus unexpected exceptions, like
// ThreadAbortException will not interrupt the execution of the finally block, and we'll not
// leak resources).
RuntimeHelpers.PrepareConstrainedRegions();
try
{
success = UnsafeNclNativeMethods.WinHttp.WinHttpGetProxyForUrl(session,
destination, ref autoProxyOptions, out proxyInfo);
if (success)
{
proxyListString = Marshal.PtrToStringUni(proxyInfo.Proxy);
}
}
finally
{
Marshal.FreeHGlobal(proxyInfo.Proxy);
Marshal.FreeHGlobal(proxyInfo.ProxyBypass);
}
return(success);
}
private int GetProxies(Uri destination, Uri scriptLocation, out string proxyListString)
{
int errorCode = 0;
proxyListString = null;
UnsafeNclNativeMethods.WinHttp.WINHTTP_AUTOPROXY_OPTIONS autoProxyOptions =
new UnsafeNclNativeMethods.WinHttp.WINHTTP_AUTOPROXY_OPTIONS();
// Always try to download the PAC file without authentication. If we turn auth. on, the WinHttp
// service will create a new session for every request (performance/memory implications).
// Therefore we only turn auto-logon on if it is really needed.
autoProxyOptions.AutoLogonIfChallenged = false;
if (scriptLocation == null)
{
// Use auto-discovery to find the script location.
autoProxyOptions.Flags = UnsafeNclNativeMethods.WinHttp.AutoProxyFlags.AutoDetect;
autoProxyOptions.AutoConfigUrl = null;
autoProxyOptions.AutoDetectFlags = UnsafeNclNativeMethods.WinHttp.AutoDetectType.Dhcp |
UnsafeNclNativeMethods.WinHttp.AutoDetectType.DnsA;
}
else
{
// Use the provided script location for the PAC file.
autoProxyOptions.Flags = UnsafeNclNativeMethods.WinHttp.AutoProxyFlags.AutoProxyConfigUrl;
autoProxyOptions.AutoConfigUrl = scriptLocation.ToString();
autoProxyOptions.AutoDetectFlags = UnsafeNclNativeMethods.WinHttp.AutoDetectType.None;
}
if (!WinHttpGetProxyForUrl(destination.ToString(), ref autoProxyOptions, out proxyListString))
{
errorCode = GetLastWin32Error();
// If the PAC file can't be downloaded because auth. was required, we check if the
// credentials are set; if so, then we try again using auto-logon.
// Note that by default webProxy.Credentials will be null. The user needs to set
// <defaultProxy useDefaultCredentials="true"> in the config file, in order for
// webProxy.Credentials to be set to DefaultNetworkCredentials.
if ((errorCode == (int)UnsafeNclNativeMethods.WinHttp.ErrorCodes.LoginFailure) &&
(Engine.Credentials != null))
{
// Now we need to try again, this time by enabling auto-logon.
autoProxyOptions.AutoLogonIfChallenged = true;
if (!WinHttpGetProxyForUrl(destination.ToString(), ref autoProxyOptions,
out proxyListString))
{
errorCode = GetLastWin32Error();
}
}
if (Logging.On)
{
Logging.PrintError(Logging.Web, SR.GetString(SR.net_log_proxy_winhttp_getproxy_failed, destination, errorCode));
}
}
return(errorCode);
}
private bool WinHttpGetProxyForUrl(string destination, ref UnsafeNclNativeMethods.WinHttp.WINHTTP_AUTOPROXY_OPTIONS autoProxyOptions, out string proxyListString)
{
proxyListString = null;
bool flag = false;
UnsafeNclNativeMethods.WinHttp.WINHTTP_PROXY_INFO proxyInfo = new UnsafeNclNativeMethods.WinHttp.WINHTTP_PROXY_INFO();
RuntimeHelpers.PrepareConstrainedRegions();
try
{
flag = UnsafeNclNativeMethods.WinHttp.WinHttpGetProxyForUrl(this.session, destination, ref autoProxyOptions, out proxyInfo);
if (flag)
{
proxyListString = Marshal.PtrToStringUni(proxyInfo.Proxy);
}
}
finally
{
Marshal.FreeHGlobal(proxyInfo.Proxy);
Marshal.FreeHGlobal(proxyInfo.ProxyBypass);
}
return(flag);
}
private int GetProxies(Uri destination, Uri scriptLocation, out string proxyListString)
{
int num = 0;
proxyListString = null;
UnsafeNclNativeMethods.WinHttp.WINHTTP_AUTOPROXY_OPTIONS autoProxyOptions = new UnsafeNclNativeMethods.WinHttp.WINHTTP_AUTOPROXY_OPTIONS {
AutoLogonIfChallenged = false
};
if (scriptLocation == null)
{
autoProxyOptions.Flags = UnsafeNclNativeMethods.WinHttp.AutoProxyFlags.AutoDetect;
autoProxyOptions.AutoConfigUrl = null;
autoProxyOptions.AutoDetectFlags = UnsafeNclNativeMethods.WinHttp.AutoDetectType.DnsA | UnsafeNclNativeMethods.WinHttp.AutoDetectType.Dhcp;
}
else
{
autoProxyOptions.Flags = UnsafeNclNativeMethods.WinHttp.AutoProxyFlags.AutoProxyConfigUrl;
autoProxyOptions.AutoConfigUrl = scriptLocation.ToString();
autoProxyOptions.AutoDetectFlags = UnsafeNclNativeMethods.WinHttp.AutoDetectType.None;
}
if (!this.WinHttpGetProxyForUrl(destination.ToString(), ref autoProxyOptions, out proxyListString))
{
num = GetLastWin32Error();
if ((num == 0x2eef) && (base.Engine.Credentials != null))
{
autoProxyOptions.AutoLogonIfChallenged = true;
if (!this.WinHttpGetProxyForUrl(destination.ToString(), ref autoProxyOptions, out proxyListString))
{
num = GetLastWin32Error();
}
}
if (Logging.On)
{
Logging.PrintError(Logging.Web, SR.GetString("net_log_proxy_winhttp_getproxy_failed", new object[] { destination, num }));
}
}
return(num);
}
