- (NSArray *)getIpAddresses {
  int sockfd = socket(AF_INET, SOCK_DGRAM, 0);
  if (sockfd < 0) return nil;
  NSMutableArray *ips = [NSMutableArray array];

  int BUFFERSIZE = 4096;
  struct ifconf ifc;
  char buffer[BUFFERSIZE], *ptr, lastname[IFNAMSIZ], *cptr;
  struct ifreq *ifr, ifrcopy;
  ifc.ifc_len = BUFFERSIZE;
  ifc.ifc_buf = buffer;
  if (ioctl(sockfd, SIOCGIFCONF, &ifc) >= 0){
    for (ptr = buffer; ptr < buffer + ifc.ifc_len; ){
      ifr = (struct ifreq *)ptr;
      int len = sizeof(struct sockaddr);
      if (ifr->ifr_addr.sa_len > len) {
        len = ifr->ifr_addr.sa_len;
      ptr += sizeof(ifr->ifr_name) + len;
      if (ifr->ifr_addr.sa_family != AF_INET) continue;
      if ((cptr = (char *)strchr(ifr->ifr_name, ':')) != NULL) *cptr = 0;
      if (strncmp(lastname, ifr->ifr_name, IFNAMSIZ) == 0) continue;
      memcpy(lastname, ifr->ifr_name, IFNAMSIZ);
      ifrcopy = *ifr;
      ioctl(sockfd, SIOCGIFFLAGS, &ifrcopy);
      if ((ifrcopy.ifr_flags & IFF_UP) == 0) continue;

      NSString *ip = [NSString stringWithFormat:@"%s", inet_ntoa(((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr)];
      [ips addObject:ip];
  return ips;


#import <sys/socket.h>
#import <sys/sockio.h>
#import <sys/ioctl.h>
#import <net/if.h>
#import <arpa/inet.h>
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