linux c 获取网卡mac地址吗

在 Linux C 中可以使用以下方法获取网卡的 MAC 地址:

1. 使用 `ifconfig` 命令:

```c

#include

#include

#include

#include

#include

#include

#include

#include

int main() {

int fd;

struct ifreq ifr;

fd = socket(AF_INET, SOCK_DGRAM, 0);

if (fd == -1) {

perror("socket");

return 1;

}

strncpy(ifr.ifr_name, "eth0", IFNAMSIZ - 1); // 替换为目标网卡名称

if (ioctl(fd, SIOCGIFHWADDR, &ifr) == 0) {

printf("MAC Address: %02X:%02X:%02X:%02X:%02X:%02X\n",

(unsigned char)ifr.ifr_hwaddr.sa_data[0],

(unsigned char)ifr.ifr_hwaddr.sa_data[1],

(unsigned char)ifr.ifr_hwaddr.sa_data[2],

(unsigned char)ifr.ifr_hwaddr.sa_data[3],

(unsigned char)ifr.ifr_hwaddr.sa_data[4],

(unsigned char)ifr.ifr_hwaddr.sa_data[5]);

} else {

perror("ioctl");

return 1;

}

close(fd);

return 0;

}

```

2. 使用 `getifaddrs` 函数:

```c

#include

#include

#include

#include

#include

int main() {

struct ifaddrs *ifaddr, *ifa;

int family, s;

char host[NI_MAXHOST];

if (getifaddrs(&ifaddr) == -1) {

perror("getifaddrs");

return 1;

}

for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) {

if (ifa->ifa_addr == NULL)

continue;

family = ifa->ifa_addr->sa_family;

if (family == AF_PACKET && (ifa->ifa_flags & IFF_LOOPBACK) == 0) {

printf("Interface: %s\n", ifa->ifa_name);

printf("MAC Address: ");

for (s = 0; s < 6; s++) {

if (s == 0) printf("%.2x", (unsigned char)ifa->ifa_addr->sa_data[s]);

else printf(":%.2x", (unsigned char)ifa->ifa_addr->sa_data[s]);

}

printf("\n");

}

}

freeifaddrs(ifaddr);

return 0;

}

```

这两种方法都可以获取网卡的 MAC 地址。第一种方法使用 `ioctl` 系统调用获取 MAC 地址,第二种方法使用 `getifaddrs` 函数获取。根据您的需求,选择合适的方法即可。