Linux C 使用socket获取可用网卡名称

使用socket获取所有可用的网卡名称，及mac地址

char* getfirstnetname() {
  struct ifreq ifr;
  struct ifconf ifc;
  char buf[2048];

  int sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
  if (sock == -1) {
    printf("socket error\n");
    return "";
  }

  ifc.ifc_len = sizeof(buf);
  ifc.ifc_buf = buf;
  if (ioctl(sock, SIOCGIFCONF, &ifc) == -1) {
    printf("ioctl error\n");
    return "";
  }

  struct ifreq* it = ifc.ifc_req;
  const struct ifreq* const end = it + (ifc.ifc_len / sizeof(struct ifreq));
  char szMac[64];
  //返回第一个可用的
  static char szNetName[20];
  for (; it != end; ++it) {
    strcpy(ifr.ifr_name, it->ifr_name);
      if (ioctl(sock, SIOCGIFFLAGS, &ifr) == 0) {
        if (! (ifr.ifr_flags & IFF_LOOPBACK)) {
          if (ioctl(sock, SIOCGIFHWADDR, &ifr) == 0) {
            // 过滤掉容器的
            if(strncmp(ifr.ifr_name, "docker", 6) == 0) continue;
            unsigned char* ptr;
            ptr = (unsigned char*)&ifr.ifr_ifru.ifru_hwaddr.sa_data[0];
            snprintf(szMac,64,"%02X-%02X-%02X-%02X-%02X-%02X",*ptr,*(ptr+1),*(ptr+2),*(ptr+3),*(ptr+4),*(ptr+5));
            snprintf(szNetName, 20, ifr.ifr_name);
            break;
          }
        }
      }
      else {
        printf("get error\n");
        return "";
      }
  }
  close(sock);
  return szNetName;
}
    

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