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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·¢ËÍÐźÅ£¬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;
}

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