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Development 2008/11/10 09:43

[Linux C API]mac address가져오기.

#include <stdio.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <memory.h>
#include <netinet/ether.h>
#include <net/if.h>

/**
 * Gets mac address with specified interface name.
 *
 * @param szInfName [in] interface name.
 * @param szMAC [out] retrieved mac address.
 * @param nLen [out] size of mac address string.
 * @return 0 is success, otherwise failure.
 *
 * @author Kang, Ji-Hoon (kang@ghoon.com)
 * @date 2008-11-07
 */
int getMacAddr(const char* szInfName, char* szMac, int* nLen)
{
    char* mac_addr = NULL;
    struct ifreq  ifrq;
    int fd = socket(AF_INET, SOCK_DGRAM, 0);
    struct sockaddr *sa = NULL;

memset(&ifrq, 0, sizeof(ifrq));
    strcpy(ifrq.ifr_name , szInfName);

if (ioctl(fd, SIOCGIFHWADDR, &ifrq) < 0) {
        close(fd);
        fprintf(stderr, "%s:%d> ERROR getMacAddr", __FILE__, __LINE__);
        return 1;
    }

sa = &(ifrq.ifr_hwaddr);
    mac_addr = (char*) ether_ntoa((struct ether_addr*) sa->sa_data );
    if (mac_addr == NULL) {
        return 1;
    }

memset(szMac, 0, sizeof(szMac));
    sprintf(szMac, "%s", mac_addr);
    *nLen = strlen(szMac);

close(fd);
    return 0;

}

int main(int argc, char** argv)
{
    char sMacAddr[64] = {0,};
    int nLength = 0;
    if (getMacAddr(sMacAddr, &nLength) != 0) {
        return 1;
    }
    printf("MacAddr : %s\nString length : %d\n", sMacAddr, nLength);
    return 0;

}

posted by 강지훈

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