Get internal disk serial number

get_disk_sn.m

NSString* getInternalDiskSN()
{
    NSString* result = @"";
    
    CFMutableDictionaryRef matching;
    matching = IOServiceMatching("IOAHCIBlockStorageDevice");
    io_service_t service = IOServiceGetMatchingService(kIOMasterPortDefault, matching);
    if (service) {
        CFMutableDictionaryRef properties = NULL;
        IORegistryEntryCreateCFProperties(service, &properties, NULL, kNilOptions);
        CFDictionaryRef device_properties = CFDictionaryGetValue(properties, CFSTR("Device Characteristics"));
        CFStringRef serial_number = CFDictionaryGetValue(device_properties, CFSTR("Serial Number"));
        result = (__bridge NSString*)serial_number;
        IOObjectRelease(service);
    }
    return [result stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
}

int main(int argc, const char * argv[])
{

    @autoreleasepool {
        NSString* serial_number = getInternalDiskSN();
        NSLog(@"disk sn:%@", serial_number);
    }
    return 0;
}