Duck is a UIID and then a UIID - it should be different every second of a second all over the world. If you want a non-editable UIID, then earlier, yes, you used a device identifier. In this connection, advertisers abused the collection of this information. And now this function is controlled by the user. Today we got out of this situation by requesting the GSM address of the GSM / Wi-Fi podley, after the hash of the md5-like function we got the UID.
Here is an example implementation:
@implementation TCMacAddress + (NSString *)getMacAddress { int mgmtInfoBase[6]; char *msgBuffer = NULL; size_t length; unsigned char macAddress[6]; struct if_msghdr *interfaceMsgStruct; struct sockaddr_dl *socketStruct; NSString *errorFlag = NULL; // Setup the management Information Base (mib) mgmtInfoBase[0] = CTL_NET; // Request network subsystem mgmtInfoBase[1] = AF_ROUTE; // Routing table info mgmtInfoBase[2] = 0; mgmtInfoBase[3] = AF_LINK; // Request link layer information mgmtInfoBase[4] = NET_RT_IFLIST; // Request all configured interfaces // With all configured interfaces requested, get handle index if ((mgmtInfoBase[5] = if_nametoindex("en0")) == 0) errorFlag = @"if_nametoindex failure"; else { // Get the size of the data available (store in len) if (sysctl(mgmtInfoBase, 6, NULL, &length, NULL, 0) < 0) errorFlag = @"sysctl mgmtInfoBase failure"; else { // Alloc memory based on above call if ((msgBuffer = malloc(length)) == NULL) errorFlag = @"buffer allocation failure"; else { // Get system information, store in buffer if (sysctl(mgmtInfoBase, 6, msgBuffer, &length, NULL, 0) < 0) errorFlag = @"sysctl msgBuffer failure"; } } } // Befor going any further... if (errorFlag != NULL) { NSLog(@"Error: %@", errorFlag); return errorFlag; } // Map msgbuffer to interface message structure interfaceMsgStruct = (struct if_msghdr *) msgBuffer; // Map to link-level socket structure socketStruct = (struct sockaddr_dl *) (interfaceMsgStruct + 1); // Copy link layer address data in socket structure to an array memcpy(&macAddress, socketStruct->sdl_data + socketStruct->sdl_nlen, 6); // Read from char array into a string object, into traditional Mac address format NSString *macAddressString = [NSString stringWithFormat:@"%02X:%02X:%02X:%02X:%02X:%02X", macAddress[0], macAddress[1], macAddress[2], macAddress[3], macAddress[4], macAddress[5]]; //NSLog(@"Mac Address: %@", macAddressString); // Release the buffer memory free(msgBuffer); return macAddressString; } @end
