iPhone WiFi Subnet Mask and Router Address

iphone, wifi

Solution

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!

Problem

I have code that allows me to determine the MAC address and the IP address of 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?

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