获取linux机器上的网卡地址

 

#include <stdio.h>
#include <string.h>

#include <sys/socket.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <unistd.h>

int get_mac(char* in_mac, int size)
{
    struct ifreq ifr;
    struct ifconf ifc;
    char buf[1024];
    unsigned char mac[6];
    int success = 0;

    int sock = socket(AF_INET, SOCK_DGRAM, 0);
    if (sock == -1) { /* handle error*/ };

    ifc.ifc_len = sizeof(buf);
    ifc.ifc_buf = buf;
    if (ioctl(sock, SIOCGIFCONF, &ifc) == -1) { /* handle error */ }

    struct ifreq* it = ifc.ifc_req;
    const struct ifreq* const end = it + (ifc.ifc_len / sizeof(struct ifreq));

    for (; it != end; ++it) {
        strcpy(ifr.ifr_name, it->ifr_name);
        if (ioctl(sock, SIOCGIFFLAGS, &ifr) == 0) {
            if (! (ifr.ifr_flags & IFF_LOOPBACK)) { // don't count loopback
                if (ioctl(sock, SIOCGIFHWADDR, &ifr) == 0) {
                    memcpy(mac, ifr.ifr_hwaddr.sa_data, 6);
                    snprintf(in_mac, size, "%.2x:%.2x:%.2x:%.2x:%.2x:%.2x\n" , mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
                    success = 1;
                    break;
                }
            }
        }
    }

    return success;
}


int main()
{
    char mac[32];

    bzero(mac, sizeof(mac));
    if (get_mac(mac, 32)) {
        printf(mac);
    }

    return 0;
}

 

 运行效果