如何使用 C 程序获取机器的 MAC 地址? [英] How to get MAC address of your machine using a C program?
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问题描述
我正在开发 Ubuntu.如何使用 C 程序获取我的机器的 MAC 地址或接口说 eth0.
I am working on Ubuntu. How can I get MAC address of my machine or an interface say eth0 using C program.
推荐答案
您需要遍历机器上所有可用的接口,并使用带有 SIOCGIFHWADDR
标志的 ioctl
获取mac地址.mac 地址将作为 6 个八位字节的二进制数组获得.您还想跳过环回接口.
You need to iterate over all the available interfaces on your machine, and use ioctl
with SIOCGIFHWADDR
flag to get the mac address. The mac address will be obtained as a 6-octet binary array. You also want to skip the loopback interface.
#include <sys/ioctl.h>
#include <net/if.h>
#include <unistd.h>
#include <netinet/in.h>
#include <string.h>
int main()
{
struct ifreq ifr;
struct ifconf ifc;
char buf[1024];
int success = 0;
int sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
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) {
success = 1;
break;
}
}
}
else { /* handle error */ }
}
unsigned char mac_address[6];
if (success) memcpy(mac_address, ifr.ifr_hwaddr.sa_data, 6);
}
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