获取 Linux 下 MAC 地址

最新推荐文章于 2025-03-27 14:43:40 发布

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最新推荐文章于 2025-03-27 14:43:40 发布

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本文介绍了一种通过C语言编程获取指定网卡（如eth0）的MAC地址的方法。使用了socket编程接口，并通过ioctl系统调用实现了对硬件地址的读取。文中提供了一个完整的示例程序，该程序不仅展示了如何获取MAC地址，还演示了如何将其转换为常见的十六进制字符串格式进行输出。

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#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;
}