Get IP address of iOS device

ipaddr.m

#import <ifaddrs.h>
#import <arpa/inet.h>

/**
 * Returns the IP adress of the device.
 */
- (NSString*)ipaddr {
  NSString *address = nil;
  struct ifaddrs *interfaces = NULL;
  struct ifaddrs *temp_addr = NULL;

  int success = 0;
  success = getifaddrs(&interfaces);
  if (success == 0) {
    temp_addr = interfaces;
    while(temp_addr != NULL) {
      if(temp_addr->ifa_addr->sa_family == AF_INET) {
        if(strcmp(temp_addr->ifa_name, "en0") == 0) {
          address = [NSString
                      stringWithUTF8String:
                        inet_ntoa(((struct sockaddr_in *)
                                   temp_addr->ifa_addr)->sin_addr)];
        }
      }
      temp_addr = temp_addr->ifa_next;
    }
  }

  // Free memory
  freeifaddrs(interfaces);
  return address;
}