iPhone WiFi Subnet Mask and Router Address

I have code that allows me to determine the MAC address and the IP address of 开发者_如何学编程the WiFi connection on the iPhone, but I can't figure out how to get the Subnet Mask and Router address for the connection. Can anyone point me in the right direction here?

You can get that information by calling getifaddrs. (I use this function in an app of mine to figure out the iPhone's IP address.)

struct ifaddrs *ifa = NULL, *ifList;
getifaddrs(&ifList); // should check for errors
for (ifa = ifList; ifa != NULL; ifa = ifa->ifa_next) {
   ifa->ifa_addr // interface address
   ifa->ifa_netmask // subnet mask
   ifa->ifa_dstaddr // broadcast address, NOT router address
}
freeifaddrs(ifList); // clean up after yourself

This gets you the subnet mask; for the router address, see this question.

This is all old-school UNIX networking stuff, you'll have to pick out which of the interfaces is the WiFi connection (other stuff like a loopback interface will be in there too). Then you might have to use functions like inet_ntoa() depending on what format you want to read the IP addresses. It's not bad, just tedious and ugly. Have fun!

NSString *address = @"error";
NSString *netmask = @"error";
struct ifaddrs *interfaces = NULL;
struct ifaddrs *temp_addr = NULL;
int success = 0;

// retrieve the current interfaces - returns 0 on success
success = getifaddrs(&interfaces);
if (success == 0)
{
    // Loop through linked list of interfaces
    temp_addr = interfaces;
    while(temp_addr != NULL)
    {
        if(temp_addr->ifa_addr->sa_family == AF_INET)
        {
            // Check if interface is en0 which is the wifi connection on the iPhone

            if([[NSString stringWithUTF8String:temp_addr->ifa_name] isEqualToString:@"en0"])
            {
                // Get NSString from C String
                address = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_addr)->sin_addr)];
                netmask = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_netmask)->sin_addr)];
            }
        }

        temp_addr = temp_addr->ifa_next;
    }
}

// Free memory
freeifaddrs(interfaces);
NSLog(@"address %@", address);
NSLog(@"netmask %@", netmask);