struct ifaddrs *addrs, *paddrs;
    if(getifaddrs(&addrs) < 0){
        print("get interface address error \r\n");
        return 1;
    }

    paddrs = addrs;

    while(paddrs){
        if(paddrs->ifa_addr->sa_family == AF_INET){ // IP v4
            printf("interface: %s\r\n", paddrs->ifa_name);
        }

        paddrs = paddrs->ifa_next;
    }

    freeifaddrs(addrs);