取得 IP

記下來


unsigned ip[4]; /* IP address components */

if (sscanf(name, "%u.%u.%u.%u", ip, ip + 1, ip + 2, ip + 3) != 4)
return (NULL); /* Must have 4 numbers */

if (ip[0] > 255 || ip[1] > 255 || ip[2] > 255 || ip[3] > 255)
return (NULL); /* Invalid byte ranges! */