NSString * getDeviceType() {
  size_t size;
  sysctlbyname("hw.machine", NULL, &size, NULL, 0);
  char *machine = malloc(size);
  sysctlbyname("hw.machine", machine, &size, NULL, 0);
  NSString *deviceType = [NSString stringWithCString:machine
                                          encoding:NSUTF8StringEncoding];
  free(machine);
  
  if ([deviceType isEqualToString:@"iPhone1,1"])    return @"iPhone 2G";
  if ([deviceType isEqualToString:@"iPhone1,2"])    return @"iPhone 3G";
  if ([deviceType isEqualToString:@"iPhone2,1"])    return @"iPhone 3GS";
  if ([deviceType isEqualToString:@"iPhone3,1"])    return @"iPhone 4";
  if ([deviceType isEqualToString:@"iPhone3,2"])    return @"iPhone 4";
  if ([deviceType isEqualToString:@"iPhone3,3"])    return @"iPhone 4";
  if ([deviceType isEqualToString:@"iPhone4,1"])    return @"iPhone 4S";
  if ([deviceType isEqualToString:@"iPhone5,1"])    return @"iPhone 5";
  if ([deviceType isEqualToString:@"iPhone5,2"])    return @"iPhone 5 (GSM+CDMA)";
  if ([deviceType isEqualToString:@"iPhone5,3"])    return @"iPhone 5c (GSM)";
  if ([deviceType isEqualToString:@"iPhone5,4"])    return @"iPhone 5c (GSM+CDMA)";
  if ([deviceType isEqualToString:@"iPhone6,1"])    return @"iPhone 5s (GSM)";
  if ([deviceType isEqualToString:@"iPhone6,2"])    return @"iPhone 5s (GSM+CDMA)";
  if ([deviceType isEqualToString:@"iPhone7,1"])    return @"iPhone 6 Plus";
  if ([deviceType isEqualToString:@"iPhone7,2"])    return @"iPhone 6";
  if ([deviceType isEqualToString:@"iPhone8,1"])    return @"iPhone 6s";
  if ([deviceType isEqualToString:@"iPhone8,2"])    return @"iPhone 6s Plus";
  if ([deviceType isEqualToString:@"iPhone8,4"])    return @"iPhone SE";
  if ([deviceType isEqualToString:@"iPhone9,1"])    return @"iPhone 7";
  if ([deviceType isEqualToString:@"iPhone9,3"])    return @"iPhone 7";
  if ([deviceType isEqualToString:@"iPhone9,2"])    return @"iPhone 7 Plus";
  if ([deviceType isEqualToString:@"iPhone9,4"])    return @"iPhone 7 Plus";
  if ([deviceType isEqualToString:@"iPhone10,1"])   return @"iPhone 8";
  if ([deviceType isEqualToString:@"iPhone10,4"])   return @"iPhone 8";
  if ([deviceType isEqualToString:@"iPhone10,2"])   return @"iPhone 8 Plus";
  if ([deviceType isEqualToString:@"iPhone10,5"])   return @"iPhone 8 Plus";
  if ([deviceType isEqualToString:@"iPhone10,3"])   return @"iPhone X";
  if ([deviceType isEqualToString:@"iPhone10,6"])   return @"iPhone X";
  if ([deviceType isEqualToString:@"iPhone11,8"])   return @"iPhone XR";
  if ([deviceType isEqualToString:@"iPhone11,2"])   return @"iPhone XS";
  if ([deviceType isEqualToString:@"iPhone11,4"])   return @"iPhone XS Max";
  if ([deviceType isEqualToString:@"iPhone11,6"])   return @"iPhone XS Max";

  if ([deviceType isEqualToString:@"iPod1,1"])      return @"iPod Touch (1 Gen)";
  if ([deviceType isEqualToString:@"iPod2,1"])      return @"iPod Touch (2 Gen)";
  if ([deviceType isEqualToString:@"iPod3,1"])      return @"iPod Touch (3 Gen)";
  if ([deviceType isEqualToString:@"iPod4,1"])      return @"iPod Touch (4 Gen)";
  if ([deviceType isEqualToString:@"iPod5,1"])      return @"iPod Touch (5 Gen)";
  
  if ([deviceType isEqualToString:@"iPad1,1"])      return @"iPad";
  if ([deviceType isEqualToString:@"iPad1,2"])      return @"iPad 3G";
  if ([deviceType isEqualToString:@"iPad2,1"])      return @"iPad 2 (WiFi)";
  if ([deviceType isEqualToString:@"iPad2,2"])      return @"iPad 2";
  if ([deviceType isEqualToString:@"iPad2,3"])      return @"iPad 2 (CDMA)";
  if ([deviceType isEqualToString:@"iPad2,4"])      return @"iPad 2";
  if ([deviceType isEqualToString:@"iPad2,5"])      return @"iPad Mini (WiFi)";
  if ([deviceType isEqualToString:@"iPad2,6"])      return @"iPad Mini";
  if ([deviceType isEqualToString:@"iPad2,7"])      return @"iPad Mini (GSM+CDMA)";
  if ([deviceType isEqualToString:@"iPad3,1"])      return @"iPad 3 (WiFi)";
  if ([deviceType isEqualToString:@"iPad3,2"])      return @"iPad 3 (GSM+CDMA)";
  if ([deviceType isEqualToString:@"iPad3,3"])      return @"iPad 3";
  if ([deviceType isEqualToString:@"iPad3,4"])      return @"iPad 4 (WiFi)";
  if ([deviceType isEqualToString:@"iPad3,5"])      return @"iPad 4";
  if ([deviceType isEqualToString:@"iPad3,6"])      return @"iPad 4 (GSM+CDMA)";
  if ([deviceType isEqualToString:@"iPad4,1"])      return @"iPad Air (WiFi)";
  if ([deviceType isEqualToString:@"iPad4,2"])      return @"iPad Air (Cellular)";
  if ([deviceType isEqualToString:@"iPad4,4"])      return @"iPad Mini 2 (WiFi)";
  if ([deviceType isEqualToString:@"iPad4,5"])      return @"iPad Mini 2 (Cellular)";
  if ([deviceType isEqualToString:@"iPad4,6"])      return @"iPad Mini 2";
  if ([deviceType isEqualToString:@"iPad4,7"])      return @"iPad Mini 3";
  if ([deviceType isEqualToString:@"iPad4,8"])      return @"iPad Mini 3";
  if ([deviceType isEqualToString:@"iPad4,9"])      return @"iPad Mini 3";
  if ([deviceType isEqualToString:@"iPad5,3"])      return @"iPad Air 2";
  if ([deviceType isEqualToString:@"iPad5,4"])      return @"iPad Air 2";
    
  if ([deviceType isEqualToString:@"iPad6,3"])      return @"iPad Pro 9.7";
  if ([deviceType isEqualToString:@"iPad6,4"])      return @"iPad Pro 9.7";
  if ([deviceType isEqualToString:@"iPad6,7"])      return @"iPad Pro 12.9";
  if ([deviceType isEqualToString:@"iPad6,8"])      return @"iPad Pro 12.9";
  if ([deviceType isEqualToString:@"iPad7,1"])      return @"iPad Pro 12.9";
  if ([deviceType isEqualToString:@"iPad7,2"])      return @"iPad Pro 12.9";
  if ([deviceType isEqualToString:@"iPad8,5"])      return @"iPad Pro 12.9";
  if ([deviceType isEqualToString:@"iPad8,6"])      return @"iPad Pro 12.9";
  if ([deviceType isEqualToString:@"iPad8,7"])      return @"iPad Pro 12.9";
  if ([deviceType isEqualToString:@"iPad8,8"])      return @"iPad Pro 12.9";
  if ([deviceType isEqualToString:@"iPad7,3"])      return @"iPad Pro 10.5";
  if ([deviceType isEqualToString:@"iPad7,4"])      return @"iPad Pro 10.5";
  if ([deviceType isEqualToString:@"iPad8,1"])      return @"iPad Pro 11.0";
  if ([deviceType isEqualToString:@"iPad8,2"])      return @"iPad Pro 11.0";
  if ([deviceType isEqualToString:@"iPad8,3"])      return @"iPad Pro 11.0";
  if ([deviceType isEqualToString:@"iPad8,4"])      return @"iPad Pro 11.0";
    
  if ([deviceType isEqualToString:@"i386"])         return @"Simulator";
  if ([deviceType isEqualToString:@"x86_64"])       return @"Simulator";
  
  return @"unknown";
}