mirror of
https://github.com/anticensority/runet-censorship-bypass.git
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205 lines
10 KiB
C#
205 lines
10 KiB
C#
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using System;
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using System.Runtime.InteropServices;
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namespace PacProxyUsage
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{
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/// <summary>
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/// Summary description for Win32Api.
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/// </summary>
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public class Win32Api
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{
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#region AutoProxy Constants
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/// <summary>
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/// Applies only when setting proxy information
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/// </summary>
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public const int WINHTTP_ACCESS_TYPE_DEFAULT_PROXY = 0;
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/// <summary>
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/// Internet accessed through a direct connection
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/// </summary>
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public const int WINHTTP_ACCESS_TYPE_NO_PROXY = 1;
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/// <summary>
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/// Internet accessed using a proxy
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/// </summary>
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public const int WINHTTP_ACCESS_TYPE_NAMED_PROXY = 3;
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/// <summary>
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/// Attempt to automatically discover the URL of the
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/// PAC file using both DHCP and DNS queries to the local network.
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/// </summary>
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public const int WINHTTP_AUTOPROXY_AUTO_DETECT = 0x00000001;
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/// <summary>
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/// Download the PAC file from the URL in the WINHTTP_AUTOPROXY_OPTIONS structure.
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/// </summary>
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public const int WINHTTP_AUTOPROXY_CONFIG_URL = 0x00000002;
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/// <summary>
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/// Executes the Web Proxy Auto-Discovery (WPAD) protocol in-process instead of
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/// delegating to an out-of-process WinHTTP AutoProxy Service, if available.
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/// This flag must be combined with one of the other flags
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/// </summary>
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public const int WINHTTP_AUTOPROXY_RUN_INPROCESS = 0x00010000;
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/// <summary>
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/// By default, WinHTTP is configured to fall back to auto-discover a proxy
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/// in-process. If this fallback behavior is undesirable in the event that
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/// an out-of-process discovery fails, it can be disabled using this flag.
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/// </summary>
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public const int WINHTTP_AUTOPROXY_RUN_OUTPROCESS_ONLY = 0x00020000;
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/// <summary>
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/// Use DHCP to locate the proxy auto-configuration file.
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/// </summary>
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public const int WINHTTP_AUTO_DETECT_TYPE_DHCP = 0x00000001;
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/// <summary>
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/// Use DNS to attempt to locate the proxy auto-configuration file at a
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/// well-known location on the domain of the local computer
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/// </summary>
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public const int WINHTTP_AUTO_DETECT_TYPE_DNS_A = 0x00000002;
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#endregion
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#region Proxy Structures
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/// <summary>
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/// The structure is used to indicate to the WinHttpGetProxyForURL
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/// function whether to specify the URL of the Proxy Auto-Configuration
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/// (PAC) file or to automatically locate the URL with DHCP or DNS
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/// queries to the network
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/// </summary>
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[StructLayout(LayoutKind.Sequential, CharSet=CharSet.Unicode)]
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public struct WINHTTP_AUTOPROXY_OPTIONS {
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/// <summary>
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/// Mechanisms should be used to obtain the PAC file
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/// </summary>
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[MarshalAs(UnmanagedType.U4)]
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public int dwFlags;
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/// <summary>
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/// If dwflags includes the WINHTTP_AUTOPROXY_AUTO_DETECT flag,
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/// then dwAutoDetectFlags specifies what protocols are to be
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/// used to locate the PAC file. If both the DHCP and DNS auto
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/// detect flags are specified, then DHCP is used first;
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/// if no PAC URL is discovered using DHCP, then DNS is used.
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/// If dwflags does not include the WINHTTP_AUTOPROXY_AUTO_DETECT
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/// flag, then dwAutoDetectFlags must be zero.
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/// </summary>
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[MarshalAs(UnmanagedType.U4)]
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public int dwAutoDetectFlags;
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/// <summary>
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/// If dwflags includes the WINHTTP_AUTOPROXY_CONFIG_URL flag, the
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/// lpszAutoConfigUrl must point to a null-terminated Unicode string
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/// that contains the URL of the proxy auto-configuration (PAC) file.
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/// If dwflags does not include the WINHTTP_AUTOPROXY_CONFIG_URL flag,
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/// then lpszAutoConfigUrl must be NULL.
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/// </summary>
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public string lpszAutoConfigUrl;
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/// <summary>
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/// Reserved for future use; must be NULL.
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/// </summary>
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public IntPtr lpvReserved;
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/// <summary>
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/// Reserved for future use; must be zero.
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/// </summary>
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[MarshalAs(UnmanagedType.U4)]
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public int dwReserved;
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/// <summary>
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/// Specifies whether the client's domain credentials should be automatically
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/// sent in response to an NTLM or Negotiate Authentication challenge when
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/// WinHTTP requests the PAC file.
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/// If this flag is TRUE, credentials should automatically be sent in response
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/// to an authentication challenge. If this flag is FALSE and authentication
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/// is required to download the PAC file, the WinHttpGetProxyForUrl fails.
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/// </summary>
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[MarshalAs(UnmanagedType.Bool)]
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public bool fAutoLoginIfChallenged;
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}
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/// <summary>
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/// The structure contains the session or default proxy configuration.
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/// </summary>
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[StructLayout(LayoutKind.Sequential, CharSet=CharSet.Unicode)]
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public struct WINHTTP_PROXY_INFO {
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/// <summary>
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/// Unsigned long integer value that contains the access type
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/// </summary>
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[MarshalAs(UnmanagedType.U4)]
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public int dwAccessType;
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/// <summary>
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/// Pointer to a string value that contains the proxy server list
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/// </summary>
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public string lpszProxy;
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/// <summary>
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/// Pointer to a string value that contains the proxy bypass list
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/// </summary>
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public string lpszProxyBypass;
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}
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#endregion
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#region WinHttp
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/// <summary>
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/// This function implements the Web Proxy Auto-Discovery (WPAD) protocol
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/// for automatically configuring the proxy settings for an HTTP request.
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/// The WPAD protocol downloads a Proxy Auto-Configuration (PAC) file,
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/// which is a script that identifies the proxy server to use for a given
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/// target URL. PAC files are typically deployed by the IT department within
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/// a corporate network environment. The URL of the PAC file can either be
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/// specified explicitly or WinHttpGetProxyForUrl can be instructed to
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/// automatically discover the location of the PAC file on the local network.
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/// </summary>
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/// <param name="hSession">The WinHTTP session handle returned by the WinHttpOpen function</param>
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/// <param name="lpcwszUrl">A pointer to a null-terminated Unicode string that contains the
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/// URL of the HTTP request that the application is preparing to send.</param>
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/// <param name="pAutoProxyOptions">A pointer to a WINHTTP_AUTOPROXY_OPTIONS structure that
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/// specifies the auto-proxy options to use.</param>
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/// <param name="pProxyInfo">A pointer to a WINHTTP_PROXY_INFO structure that receives the
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/// proxy setting. This structure is then applied to the request handle using the
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/// WINHTTP_OPTION_PROXY option.</param>
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/// <returns></returns>
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[DllImport("winhttp.dll", SetLastError=true, CharSet=CharSet.Unicode)]
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public static extern bool WinHttpGetProxyForUrl(
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IntPtr hSession,
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string lpcwszUrl,
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ref WINHTTP_AUTOPROXY_OPTIONS pAutoProxyOptions,
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ref WINHTTP_PROXY_INFO pProxyInfo);
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/// <summary>
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/// The function initializes, for an application, the use of WinHTTP
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/// functions and returns a WinHTTP-session handle
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/// </summary>
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/// <param name="pwszUserAgent">A pointer to a string variable that contains the name of the
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/// application or entity calling the WinHTTP functions.</param>
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/// <param name="dwAccessType">Type of access required. This can be one of the following values</param>
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/// <param name="pwszProxyName"> A pointer to a string variable that contains the name of the
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/// proxy server to use when proxy access is specified by setting dwAccessType to
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/// WINHTTP_ACCESS_TYPE_NAMED_PROXY. The WinHTTP functions recognize only CERN type proxies for HTTP.
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/// If dwAccessType is not set to WINHTTP_ACCESS_TYPE_NAMED_PROXY, this parameter must be set
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/// to WINHTTP_NO_PROXY_NAME</param>
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/// <param name="pwszProxyBypass">A pointer to a string variable that contains an optional list
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/// of host names or IP addresses, or both, that should not be routed through the proxy when
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/// dwAccessType is set to WINHTTP_ACCESS_TYPE_NAMED_PROXY. The list can contain wildcard characters.
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/// Do not use an empty string, because the WinHttpOpen function uses it as the proxy bypass list.
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/// If this parameter specifies the "<local>" macro as the only entry, this function bypasses
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/// any host name that does not contain a period. If dwAccessType is not set to WINHTTP_ACCESS_TYPE_NAMED_PROXY,
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/// this parameter must be set to WINHTTP_NO_PROXY_BYPASS.</param>
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/// <param name="dwFlags">Unsigned long integer value that contains the flags that indicate various options
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/// affecting the behavior of this function</param>
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/// <returns>Returns a valid session handle if successful, or NULL otherwise</returns>
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[DllImport("winhttp.dll", SetLastError=true, CharSet=CharSet.Unicode)]
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public static extern IntPtr WinHttpOpen(
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string pwszUserAgent,
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int dwAccessType,
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IntPtr pwszProxyName,
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IntPtr pwszProxyBypass,
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int dwFlags
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);
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/// <summary>
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/// The function closes a single HINTERNET handle
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/// </summary>
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/// <param name="hInternet">Valid HINTERNET handle to be closed.</param>
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/// <returns>Returns TRUE if the handle is successfully closed, or FALSE otherwise</returns>
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[DllImport("winhttp.dll", SetLastError=true, CharSet=CharSet.Unicode)]
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public static extern bool WinHttpCloseHandle(IntPtr hInternet);
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#endregion
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[DllImport("kernel32.dll")]
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public static extern int GetLastError();
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}
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}
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