How to get Subnet Mask and Broadcast Address of Personal Hotspot in iOS

问题

I need to find out a way to find out subnet mask and broadcast address of my personal hotspot in iOS.

I am using following way to find out IP address of device if it's connected to WiFi. But can't figure out the way to get network properties for Personal Hotspot.

+ (NSString *) localIPAddress
{
    NSString *address = @"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)
    {
        temp_addr = interfaces;

        while(temp_addr != NULL)
        {
            // check if interface is en0 which is the wifi connection on the iPhone
            if(temp_addr->ifa_addr->sa_family == AF_INET)
            {
                if([[NSString stringWithUTF8String:temp_addr->ifa_name] isEqualToString:@"en0"])
                {
                    address = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_addr)->sin_addr)];
                }
            }

            temp_addr = temp_addr->ifa_next;
        }
    }

    freeifaddrs(interfaces);

    return address;
}

回答1:

where address is assigned, just insert:

netmask = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_netmask)->sin_addr)];

来源：https://stackoverflow.com/questions/15156028/how-to-get-subnet-mask-and-broadcast-address-of-personal-hotspot-in-ios