在 OSX 上使用 WPAD 检索 PAC 脚本

问题描述

如何在 OSX 上使用 WPAD 检索 PAC 脚本?是否足以获取http://wpad/wpad.dat"的内容以希望 DNS 已为此约定预配置wpad"?

How do I retrieve the PAC script using WPAD on OSX? is it enough to fetch the contents of "http://wpad/wpad.dat" in hopes that the DNS has "wpad" pre-configured for this convention?

有没有更正式"的方法来做到这一点?

is there a more "formal" method of doing this?

推荐答案

以下是获取给定 URL 的 PAC 代理的方法:

Here is how to get PAC proxies for a given URL:

#import <Foundation/Foundation.h>
#import <CoreServices/CoreServices.h>
#import <SystemConfiguration/SystemConfiguration.h>

CFArrayRef CopyPACProxiesForURL(CFURLRef targetURL, CFErrorRef *error)
{
    CFDictionaryRef proxies = SCDynamicStoreCopyProxies(NULL);
    if (!proxies)
        return NULL;

    CFNumberRef pacEnabled;
    if ((pacEnabled = (CFNumberRef)CFDictionaryGetValue(proxies, kSCPropNetProxiesProxyAutoConfigEnable)))
    {
        int enabled;
        if (CFNumberGetValue(pacEnabled, kCFNumberIntType, &enabled) && enabled)
        {
            CFStringRef pacLocation = (CFStringRef)CFDictionaryGetValue(proxies, kSCPropNetProxiesProxyAutoConfigURLString);
            CFURLRef pacUrl = CFURLCreateWithString(kCFAllocatorDefault, pacLocation, NULL);
            CFDataRef pacData;
            SInt32 errorCode;
            if (!CFURLCreateDataAndPropertiesFromResource(kCFAllocatorDefault, pacUrl, &pacData, NULL, NULL, &errorCode))
                return NULL;

            CFStringRef pacScript = CFStringCreateFromExternalRepresentation(kCFAllocatorDefault, pacData, kCFStringEncodingISOLatin1);
            if (!pacScript)
                return NULL;

            CFArrayRef pacProxies = CFNetworkCopyProxiesForAutoConfigurationScript(pacScript, targetURL, error);
            return pacProxies;
        }
    }

    return NULL;
}

int main(int argc, const char *argv[])
{
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

    CFURLRef targetURL = (CFURLRef)[NSURL URLWithString : @"http://stackoverflow.com/questions/4379156/retrieve-pac-script-using-wpad-on-osx/"];
    CFErrorRef error = NULL;
    CFArrayRef proxies = CopyPACProxiesForURL(targetURL, &error);
    if (proxies)
    {
        for (CFIndex i = 0; i < CFArrayGetCount(proxies); i++)
        {
            CFDictionaryRef proxy = CFArrayGetValueAtIndex(proxies, i);
            NSLog(@"%d
%@", i, [(id)proxy description]);
        }
        CFRelease(proxies);
    }

    [pool drain];
}

为了简单起见，这段代码充满了漏洞(您应该释放通过Copy 和Create 函数获得的所有内容)并且不处理任何潜在的错误.

For the sake of simplicity, this code is full of leaks (you should release everything you got through Copy and Create functions) and does not handle any potential error.

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