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，希望DNS为此约定预配置了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?

是否有更多的正式方法这样做？

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

推荐答案

这里是如何获取PAC代理给定的URL： / p>

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\n%@", i, [(id)proxy description]);
        }
        CFRelease(proxies);
    }

    [pool drain];
}

为了简单起见，这个代码充满了漏洞您通过 和创建功能所获得的一切），并且不会处理任何潜在错误。

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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