netlink

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#include <sys/socket.h> #include <linux/types.h> #include <linux/netlink.h> #include <linux/rtnetlink.h>   int main(void) {         int nl_socket;         if((nl_socket = socket(PF_NETLINK,SOCK_DGRAM,NETLINK_ROUTE)) == -1)                 exit(1);           struct sockaddr_nl addr;         memset(&addr,0,sizeof(addr));         addr.nl_family = PF_NETLINK;         addr.nl_groups = RTMGRP_IPV4_IFADDR;         addr.nl_pid=0;           if(bind(nl_socket,(struct sockaddr *)&addr,sizeof(addr)) == -1)         {                       close(nl_socket);                 exit(1);         }               return 0; }

http://blog.csdn.net/luckyapple1028/article/details/50839395

http://blog.csdn.net/luckyapple1028/article/details/50936563

https://www.ibm.com/developerworks/cn/linux/1305_wanghz_ddns/

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#include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <sys/socket.h> #include <sys/select.h> #include <sys/time.h>   #include <linux/types.h> #include <linux/netlink.h> #include <linux/rtnetlink.h> #include <linux/if.h> #include <linux/if_ether.h>   #define MAX_MSG_SIZE    1024   void handle_newaddr(void) {     system("/usrsbin/mDNSResponder -f /var/rendezvous.conf -v 2"); }     void receive_netlink_message(int sock) {     int ret,length;     fd_set nl_rset;     struct nlmsghdr *nl;     struct timeval read_timeout = {10, 0};     struct iovec iov;  // 使用 iovec 进行接收     struct msghdr msg = {NULL, 0, &iov, 1, NULL, 0, 0}; // 初始化 msghdr            nl = NULL;     if ((nl = (struct nlmsghdr *) malloc(MAX_MSG_SIZE)) == NULL )          return;                 iov.iov_base = (void *)nl;             // 封装 nlmsghdr     iov.iov_len = MAX_MSG_SIZE;  // 指定长度            FD_ZERO(&nl_rset);     FD_SET(sock, &nl_rset);            while(1)     {         ret=select(sock+1,&nl_rset,NULL, NULL,&read_timeout);         printf("===============ret=%d===============\n",ret);               if(ret == -1)              continue;         else if (ret == 0)              continue;     else     {         length = recvmsg(sock,&msg,0);           if(length <= 0)             {         free(nl);         break;         }         switch(nl->nlmsg_type)         {         case RTM_NEWADDR:             handle_newaddr();             break;         default:             printf("Unknown netlink message type : %d", nl->nlmsg_type);        }         }     }     return ; }    int main(void) {     int nl_socket;     struct sockaddr_nl addr;            if((nl_socket = socket(PF_NETLINK,SOCK_DGRAM,NETLINK_ROUTE)) == -1)         exit(1);            memset(&addr,0,sizeof(addr));     addr.nl_family = PF_NETLINK;     addr.nl_groups = RTMGRP_IPV4_IFADDR;     addr.nl_pid=0;         if(bind(nl_socket,(struct sockaddr *)&addr,sizeof(addr)) == -1)     {             close(nl_socket);         exit(1);     }     while(1)     {     printf("111111111111111111111111111\n");     receive_netlink_message(nl_socket);     }     return 0; }

https://www.cnblogs.com/oracleloyal/p/5333276.html

https://www.ibm.com/developerworks/cn/linux/1305_wanghz_ddns/

http://blog.csdn.net/hansel/article/details/38088645

http://blog.csdn.net/gt945/article/details/45315911

网线热插拔

#include <sys/types.h>    
#include <sys/socket.h>    
#include <asm/types.h>    
#include <linux/netlink.h>    
#include <linux/rtnetlink.h>    
#include <unistd.h>  
#include <stdlib.h>    
#include <stdio.h>    
#include <sys/ioctl.h>    
#include <linux/if.h>    
#include <string.h>    
    
#define BUFLEN 20480    
    
int main(int argc, char *argv[])    
{    
    int fd, retval;    
    char buf[BUFLEN] = {0};    
    int len = BUFLEN;    
    struct sockaddr_nl addr;    
    struct nlmsghdr *nh;    
    struct ifinfomsg *ifinfo;    
    struct rtattr *attr;    
    
    fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);    
    setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, sizeof(len));    
    memset(&addr, 0, sizeof(addr));    
    addr.nl_family = AF_NETLINK;    
    addr.nl_groups = RTNLGRP_LINK;    
    bind(fd, (struct sockaddr*)&addr, sizeof(addr));    
    while ((retval = read(fd, buf, BUFLEN)) > 0)    
    {    
        for (nh = (struct nlmsghdr *)buf; NLMSG_OK(nh, retval); nh = NLMSG_NEXT(nh, retval))    
        {    
            if (nh->nlmsg_type == NLMSG_DONE)    
                break;    
            else if (nh->nlmsg_type == NLMSG_ERROR)    
                return -1;    
            else if (nh->nlmsg_type != RTM_NEWLINK)    
                continue;    
            ifinfo = NLMSG_DATA(nh);    
            printf("%u: %s", ifinfo->ifi_index,    
                    (ifinfo->ifi_flags & IFF_LOWER_UP) ? "up" : "down" );    
            attr = (struct rtattr*)(((char*)nh) + NLMSG_SPACE(sizeof(*ifinfo)));    
            len = nh->nlmsg_len - NLMSG_SPACE(sizeof(*ifinfo));    
            for (; RTA_OK(attr, len); attr = RTA_NEXT(attr, len))    
            {    
                if (attr->rta_type == IFLA_IFNAME)    
                {    
                    printf(" %s", (char*)RTA_DATA(attr));    
                    break;    
                }    
            }    
            printf("\n");    
        }    
    }    
    
    return 0;    
}

http://blog.csdn.net/qq123386926/article/details/50695725