您需要遍历计算机上所有可用的接口，并
ioctl与
SIOCGIFHWADDR标志一起使用以获取mac地址。mac地址将以6字节的二进制数组形式获取。您还希望跳过环回接口。
#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) { }; ifc.ifc_len = sizeof(buf); ifc.ifc_buf = buf; if (ioctl(sock, SIOCGIFCONF, &ifc) == -1) { } 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 { } } unsigned char mac_address[6]; if (success) memcpy(mac_address, ifr.ifr_hwaddr.sa_data, 6);}
