获取 Linux 下 MAC 地址

#include <stdio.h>
#include <net/if.h>

#include <unistd.h>
#include <sys/ioctl.h>

////////////////////////////////////////////////////////////////////////////////

int64_t GetMAC(const char *eth_name)
{
int64_t macAddr = -1;
struct ifreq ifreq;

int32_t hSocket = socket(AF_INET, SOCK_STREAM, 0);
if (hSocket < 0) {
goto Exit;
}
sprintf(ifreq.ifr_name, "%s", (eth_name == NULL) ? "eth0" : eth_name);
if (ioctl(hSocket, SIOCGIFHWADDR, &ifreq) < 0) {
goto Exit;
}
macAddr=(((int64_t)(ifreq.ifr_hwaddr.sa_data[0]) & 0xFF) << 0) |
(((int64_t)(ifreq.ifr_hwaddr.sa_data[1]) & 0xFF) << 8) |
(((int64_t)(ifreq.ifr_hwaddr.sa_data[2]) & 0xFF) << 16) |
(((int64_t)(ifreq.ifr_hwaddr.sa_data[3]) & 0xFF) << 24) |
(((int64_t)(ifreq.ifr_hwaddr.sa_data[4]) & 0xFF) << 32) |
(((int64_t)(ifreq.ifr_hwaddr.sa_data[5]) & 0xFF) << 40);

Exit:
if (hSocket >= 0) {
close(hSocket);
hSocket = -1;
}
return macAddr;
}

void GetHWaddr(unsigned char *mac)
{
int64_t macAddr	= GetMAC("eth0");
mac[0] = (unsigned char)(macAddr >> 0);
mac[1] = (unsigned char)(macAddr >> 8);
mac[2] = (unsigned char)(macAddr >> 16);
mac[3] = (unsigned char)(macAddr >> 24);
mac[4] = (unsigned char)(macAddr >> 32);
mac[5] = (unsigned char)(macAddr >> 40);
}

////////////////////////////////////////////////////////////////////////////////

int main()
{
unsigned char szMAC[8] = { 0 };
GetHWaddr(szMAC);
printf("HWaddr: %02X:%02X:%02X:%02X:%02X:%02X\n", szMAC[0], szMAC[1], szMAC[2], szMAC[3], szMAC[4], szMAC[5]);
return 0;
}