Linux ÖÐ linkwatch Àú³ÌµÄ×÷ÓúÍÔÀí
Linux ÖÐ linkwatch Àú³ÌµÄ×÷ÓúÍÔÀí
ÔÚ Linux ϵͳÖУ¬linkwatch ÊÇÒ»¸öºÜÊÇÖ÷ÒªµÄÄÚºËÀú³Ì£¬ËüµÄ×÷ÓÃÊÇʵʱ¼à²âÍøÂç½Ó¿ÚµÄ״̬ת±ä£¬²¢ÔÚ½Ó¿Ú״̬±¬·¢¸Ä±äʱ֪ͨϵͳºÍÏà¹ØµÄÓ¦ÓóÌÐò¡£linkwatch Àú³ÌÈÏÕæ¼à¿ØÍøÂç½Ó¿ÚµÄÁ´½Ó״̬£¬ÀýÈçÍøÏߵIJå°Î¡¢Íø¿ÚµÄÆôÓúÍÍ£ÓõȲÙ×÷¡£Ò»µ©·¢Ã÷ÍøÂç½Ó¿Ú״̬µÄת±ä£¬linkwatch Àú³Ì»áÁ¬Ã¦Ïòϵͳ·¢ËÍÐźţ¬Í¨ÖªÏµÍ³¾ÙÐÐÏìÓ¦µÄ´¦Öóͷ£¡£
Á´½Ó״̬µÄת±ä¿ÉÄÜ»áÉæ¼°µ½ IP µØµãµÄ±ä»»¡¢Â·ÓɱíµÄ¸üеÈÖ÷ÒªÐÅÏ¢£¬Òò´Ë linkwatch Àú³ÌµÄ×÷ÓÃÊǺÜÊÇÒªº¦µÄ¡£Í¨¹ý linkwatch Àú³Ì£¬Linux ϵͳ¿ÉÒÔʵʱÏìÓ¦ÍøÂç½Ó¿ÚµÄ״̬ת±ä£¬È·±£ÍøÂçÅþÁ¬µÄÎȹÌÐԺͿɿ¿ÐÔ¡£
linkwatch Àú³ÌµÄÔÀíÊÇͨ¹ý¼àÌý netlink socket ʵÏֵġ£netlink ÊÇ Linux ÄÚºËÓëÓû§¿Õ¼äÖ®¼ä¾ÙÐÐͨѶµÄÒ»ÖÖ»úÖÆ£¬¿ÉÒÔʵÏÖºÜÊǸßЧµÄÊý¾Ý´«Êä¡£linkwatch Àú³Ìͨ¹ý¼àÌý netlink socket£¬ÊµÊ±»ñÈ¡ÍøÂç½Ó¿Ú״̬µÄ¸Ä±äÇéÐΣ¬²¢ÊµÊ±Ïòϵͳ¾ÙÐÐ֪ͨ¡£
ÒÔÏÂÊÇÒ»¸öʹÓà C ÓïÑÔ±àдµÄ¼òÆÓʾÀý´úÂ룬ÑÝʾÁËÔõÑùʵÏÖ linkwatch Àú³ÌµÄ¹¦Ð§£º
#include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <sys/socket.h> #include <linux/netlink.h> #define MAX_PAYLOAD 1024 int main() { struct sockaddr_nl addr; int sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE); char buf[MAX_PAYLOAD]; memset(&addr, 0, sizeof(addr)); addr.nl_family = AF_NETLINK; addr.nl_groups = RTMGRP_LINK; bind(sock, (struct sockaddr *)&addr, sizeof(addr)); while (1) { recv(sock, buf, sizeof(buf), 0); // ´¦Öóͷ£ÎüÊÕµ½µÄÊý¾Ý£¬ÅжϽӿÚ״̬ת±ä²¢Í¨ÖªÏµÍ³ printf("Received link state change notification "); } close(sock); return 0; }
µÇ¼ºó¸´ÖÆ
Õâ¶Î´úÂëÑÝʾÁËÒ»¸ö¼òÆ linkwatch Àú³Ì£¬Í¨¹ý¼àÌý netlink socket µÄ RTMGRP_LINK ×飬ʵʱÎüÊÕÍøÂç½Ó¿Ú״̬ת±äµÄ֪ͨ¡£ÔÚÏÖʵӦÓÃÖУ¬¿ÉÒÔƾ֤ÏêϸÐèÇó¶ÔÎüÊÕµ½µÄÊý¾Ý¾ÙÐÐÆÊÎöºÍ´¦Öóͷ££¬ÒÔÈ·±£ÏµÍ³Äܹ»ÊµÊ±ÏìÓ¦ÍøÂç½Ó¿Ú״̬µÄת±ä¡£
×ÜÖ®£¬linkwatch Àú³ÌÔÚ Linux ϵͳÖÐÊÎÑÝ×ÅÖ÷ÒªµÄ½ÇÉ«£¬Í¨¹ýʵʱ¼à²âÍøÂç½Ó¿ÚµÄ״̬ת±ä£¬°ü¹ÜÁËÍøÂçÅþÁ¬µÄÎȹÌÐԺͿɿ¿ÐÔ¡£Í¨¹ý¶Ô linkwatch Àú³ÌµÄÃ÷È·ºÍʵÏÖ£¬¿ÉÒÔ¸üºÃµØÕÆÎÕ Linux ϵͳÖÐÍøÂçÖÎÀíµÄÔÀíºÍ»úÖÆ¡£
ÒÔÉϾÍÊÇLinux ÖÐ linkwatch Àú³ÌµÄ×÷ÓúÍÔÀíµÄÏêϸÄÚÈÝ£¬¸ü¶àÇë¹Ø×¢±¾ÍøÄÚÆäËüÏà¹ØÎÄÕ£¡