Mac OSX - how can I grab proxy configuration using Cocoa or even pure C functions?

Question

I have noticed that my app doesn't use the proxy settings available for the machine (I'm using the Charles proxy to test proxy configuration). One piece of the app that makes calls using NSURLConnection correctly uses and makes requests using the proxy, the other piece of the app (that is a MonoMac app, running on Mono, obviously) does not.

It keeps making requests as if there is no proxy configured. Is there a function or object I can use to grab the same proxy configuration NSURLConnection is using?

Answer 1

The Proxies Dictionary in SystemConfiguration framework would contain this information

Answer 2

The function that gives you all the proxy information is SCDynamicStoreCopyProxies(), it can be called as in the example below (once you're done you also have to CFRelease all of these objects, since they're all from CF and not directly Cocoa objects):

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

int main(int argc, const char * argv[])
{

  @autoreleasepool {

    CFDictionaryRef proxies = SCDynamicStoreCopyProxies(NULL);

    CFIndex count = CFDictionaryGetCount(proxies);

    NSLog(@"Number of keys is %ld", count);

    NSDictionary * proxyConfiguration = (NSDictionary*) proxies;

    for ( id key in proxyConfiguration.keyEnumerator ) {
      NSLog(@"Pair is %@ -> %@", key, [proxyConfiguration valueForKey: key]);
    }

  }
    return 0;
}

And the output will be something like:

2012-11-07 16:33:57.844 network-test[6501:403] Number of keys is 12
2012-11-07 16:33:57.847 network-test[6501:403] Pair is HTTPEnable -> 1
2012-11-07 16:33:57.848 network-test[6501:403] Pair is HTTPSProxy -> 127.0.0.1
2012-11-07 16:33:57.848 network-test[6501:403] Pair is ExceptionsList -> (
    "www.google.com"
)
2012-11-07 16:33:57.849 network-test[6501:403] Pair is HTTPSPort -> 8888
2012-11-07 16:33:57.850 network-test[6501:403] Pair is __SCOPED__ -> {
    en1 =     {
        ExceptionsList =         (
            "www.google.com"
        );
        FTPPassive = 1;
        HTTPEnable = 1;
        HTTPPort = 8888;
        HTTPProxy = "127.0.0.1";
        HTTPSEnable = 1;
        HTTPSPort = 8888;
        HTTPSProxy = "127.0.0.1";
        SOCKSEnable = 1;
        SOCKSPort = 8889;
        SOCKSProxy = "127.0.0.1";
    };
}
2012-11-07 16:33:57.850 network-test[6501:403] Pair is HTTPProxy -> 127.0.0.1
2012-11-07 16:33:57.851 network-test[6501:403] Pair is SOCKSPort -> 8889
2012-11-07 16:33:57.852 network-test[6501:403] Pair is SOCKSProxy -> 127.0.0.1
2012-11-07 16:33:57.852 network-test[6501:403] Pair is HTTPSEnable -> 1
2012-11-07 16:33:57.853 network-test[6501:403] Pair is SOCKSEnable -> 1
2012-11-07 16:33:57.853 network-test[6501:403] Pair is HTTPPort -> 8888
2012-11-07 16:33:57.854 network-test[6501:403] Pair is FTPPassive -> 1