如何提取系统内的网卡信息

代码功能是要求提取系统内的网卡信息，包括名称，类型，MAC,IP，MASK，速度等等。用C编写，数据存到结构体里。

因为多数数据在ifconfig命令下都可以显示，所以我的想法是从命令返回值中提取数据，使用popen , fgets,sscanf等函数实现。但是问题来了，在多网卡的系统下，使用命令ifconfig返回的内容很多，格式也不固定，提取起来很困难，比如：
xxx@xxxxx:~$ ifconfig
br0       Link encap:Ethernet  HWaddr a4:1f:72:98:ec:a9 
          inet addr:172.16.200.114  Bcast:172.16.200.255  Mask:255.255.255.0
          inet6 addr: fe80::a61f:72ff:fe98:eca9/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:602739296 errors:0 dropped:0 overruns:0 frame:0
          TX packets:562145310 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:261880870281 (261.8 GB)  TX bytes:480978897517 (480.9 GB)

eth0      Link encap:Ethernet  HWaddr a4:1f:72:98:ec:a9 
          inet6 addr: fe80::a61f:72ff:fe98:eca9/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:686510262 errors:0 dropped:527755 overruns:0 frame:0
          TX packets:726027323 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:278594375202 (278.5 GB)  TX bytes:494699541647 (494.6 GB)

我需要提取每一个网卡端口的对应信息，工作中刚接触C不久，所以请教各位有没有好的算法来提取？或者使用其他方式提取这些信息呢？
用ioctl可以获得指定网卡的IP地址  MAC地址  广播地址 子网掩码

{

    struct sockaddr_in *addr;
    struct sockaddr     sa;  
    struct ifreq ifr;
    char *name,*address;
    int sockfd;
    unsigned   char   mac[6];

    if(argc != 2) {
         printf("usage : ipconfig interface /n");
         return -1;
    }
    else{
         name = argv[1];
}

    sockfd = socket(AF_INET,SOCK_DGRAM,0);
    strncpy(ifr.ifr_name,name,IFNAMSIZ-1);

    if(ioctl(sockfd,SIOCGIFADDR,&ifr) == -1){
         perror("ioctl error");
         return -1;
    }

    addr = (struct sockaddr_in *)&(ifr.ifr_addr);
    address = inet_ntoa(addr->sin_addr);
    printf("inet addr: %s \n",address);

    if(ioctl(sockfd,SIOCGIFBRDADDR,&ifr) == -1){
         perror("ioctl error");
         return -1;
    }
    addr = (struct sockaddr_in *)&ifr.ifr_broadaddr;
    address = inet_ntoa(addr->sin_addr);
    printf("broad addr: %s \n",address);

    if(ioctl(sockfd,SIOCGIFNETMASK,&ifr) == -1){
         perror("ioctl error");
         return -1;
    }
    addr = (struct sockaddr_in *)&ifr.ifr_addr;
    address = inet_ntoa(addr->sin_addr);
    printf("inet mask: %s \n",address);

    if(ioctl(sockfd, SIOCGIFHWADDR, &ifr) == -1){
         perror("ioctl error");
         return -1;
    }
    memcpy(&sa,   &ifr.ifr_addr,   sizeof(struct   sockaddr_in));
    memcpy(mac,   sa.sa_data,   sizeof(mac));
    printf("%s   mac:   %.2X:%.2X:%.2X:%.2X:%.2X:%.2X\n",name,   mac[0],   mac[1],   mac[2],   mac[3],   mac[4],   mac[5]);
    return 1;

} these are static info, it doesn't need any monitoring. What's more important for network though is traffic/throughput (in/out), error, etc., which are real time and dynamic...