ioctl&SIOCGIFCONF提取IP和MAC

尝试通过ioctl&SIOCGIFCONF提取IP和MAC

# cat /etc/redhat-release
Red Hat Enterprise Linux Server release 7.0 (Maipo)

# uname -a
Linux *** 3.10.0-123.el7.x86_64 #1 SMP Mon May 5 11:16:57 EDT 2014 x86_64 x86_64 x86_64 GNU/Linux

 

#include
#include
#include
#include  
#include
#include
#include
#include
#include

#define MAX_IFS 64

int main(int argc, char **argv) {
    struct ifreq *ifr, *ifend;
    struct ifreq ifreq;
    struct ifconf ifc;
    struct ifreq ifs[MAX_IFS];
    int sockfd;
    sockfd = socket(AF_INET, SOCK_DGRAM, 0);
    ifc.ifc_len = sizeof(ifs);
    ifc.ifc_req = ifs;
    if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0) {
        printf("ioctl(SIOCGIFCONF): %m/n");
        return 0;
    }
    ifend = ifs + (ifc.ifc_len / sizeof(struct ifreq));
    for (ifr = ifc.ifc_req; ifr < ifend; ifr++) {
        if (ifr->ifr_addr.sa_family == AF_INET) {
            //strncpy(ifreq.ifr_name, "ens3",sizeof(ifreq.ifr_name));
            strncpy(ifreq.ifr_name, ifr->ifr_name,sizeof(ifreq.ifr_name));
            if (ioctl (sockfd, SIOCGIFHWADDR, &ifreq) < 0) {
                printf("SIOCGIFHWADDR(%s): %m/n", ifreq.ifr_name);
                return 0;
            }
            printf("\nIp Address %s\t", inet_ntoa( ( (struct sockaddr_in *)  &ifr->ifr_addr)->sin_addr));
            printf("\nDevice %s -> Ethernet %02x:%02x:%02x:%02x:%02x:%02x\t", ifreq.ifr_name,
                    (int) ((unsigned char *) &ifreq.ifr_hwaddr.sa_data)[0],
                    (int) ((unsigned char *) &ifreq.ifr_hwaddr.sa_data)[1],
                    (int) ((unsigned char *) &ifreq.ifr_hwaddr.sa_data)[2],
                    (int) ((unsigned char *) &ifreq.ifr_hwaddr.sa_data)[3],
                    (int) ((unsigned char *) &ifreq.ifr_hwaddr.sa_data)[4],
                    (int) ((unsigned char *) &ifreq.ifr_hwaddr.sa_data)[5]);
        }
    }
    return 0;
}

 

运行结果：

Ip Address 127.0.0.1
Device lo -> Ethernet 00:00:00:00:00:00
Ip Address 10.30.16.243
Device ens3 -> Ethernet 06:bf:76:00:0a:8f