#include <sys/socket.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <sys/types.h>
#include <ifaddrs.h>
#include <net/if.h>

- (NSArray *)localIPAddresses
{
    NSMutableArray *ipAddresses = [NSMutableArray array] ;
    
    struct ifaddrs *allInterfaces;
    
    // Get list of all interfaces on the local machine:
    if (getifaddrs(&allInterfaces) == 0) {
        struct ifaddrs *interface;
        
        // For each interface ...
        for (interface = allInterfaces; interface != NULL; interface = interface->ifa_next) {
            unsigned int flags = interface->ifa_flags;
            struct sockaddr *addr = interface->ifa_addr;
            
            // Check for running IPv4, IPv6 interfaces. Skip the loopback interface.
            if ((flags & (IFF_UP|IFF_RUNNING|IFF_LOOPBACK)) == (IFF_UP|IFF_RUNNING)) {
                if (addr->sa_family == AF_INET || addr->sa_family == AF_INET6) {
                    
                    // Convert interface address to a human readable string:
                    char host[NI_MAXHOST];
                    getnameinfo(addr, addr->sa_len, host, sizeof(host), NULL, 0, NI_NUMERICHOST);
                    
                    [ipAddresses addObject:[[NSString alloc] initWithUTF8String:host]];
                }
            }
        }
        
        freeifaddrs(allInterfaces);
    }
    
    return ipAddresses;
}