嵌入式 hi3518平台获取网络环境中的ip、netmask、broadcast等信息

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/********************************** (C) COPYRIGHT *******************************
 * File Name          : get_netinfo.c
 * Author              : skdkjzz
 * Date                 : 2014/08/07
 * Description        : linux下获取网卡信息
 *********************************************************************************/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <linux/if.h>
#include <arpa/inet.h>
#include <linux/sockios.h>

int main(int argc,char*argv[]){
    int s;
    int err;
    s=socket(AF_INET,SOCK_DGRAM,0);
    if(s<0){
        perror("socket error");
        return;
    }

    struct ifreq ifr;
#if 1
    memset(&ifr,0,sizeof(ifr));
    ifr.ifr_ifindex=1;    /* 获得第1个网络接口的名称 */

    err=ioctl(s,SIOCGIFNAME,&ifr);
    if(err)
    {
        perror("index error");
    }else
    {
        printf("----------------------------------\n");
        printf("The %dst net device is : %s\n",ifr.ifr_ifindex,ifr.ifr_name);
    }

    err=ioctl(s,SIOCGIFHWADDR,&ifr);   /* 获得MAC地址 */
    printf("%s:[%d] err is %d\n",__FUNCTION__,__LINE__,err);
    if(!err)
    {
        unsigned char* hw=ifr.ifr_hwaddr.sa_data;
        printf("Mac address is : %02x:%02x:%02x:%02x:%02x:%02x\n",hw[0],hw[1],hw[2],hw[3],hw[4],hw[5]);
    }
    else
    {
        printf("Mac address is : 00:00:00:00:00:00\n");
    }

    struct sockaddr_in *sin=(struct sockaddr_in*)&ifr.ifr_addr; /* 获取网络接口IP保存的是二进制IP */
    char ip[16];   /* 字符数组，存放字符串 */
    memset(ip,0,16);
    err=ioctl(s,SIOCGIFADDR,&ifr);
    if(!err)
    {
        inet_ntop(AF_INET,&sin->sin_addr.s_addr,ip,16);  /* 转换的字符串保存到ip数组中，第二个参数是要转换的二进制IP指针，第三个参数是转换完成存放IP的缓冲区，最后一个参数是缓冲区的长度 */
        printf("IP address is : %s\n",ip);
    }else
    {
        printf("IP address is : 0.0.0.0\n");
    }

    err=ioctl(s,SIOCGIFBRDADDR,&ifr);   /* 得到接口的广播地址 */
    if(!err)
    {
        struct sockaddr_in *broadcast=(struct sockaddr_in*)&ifr.ifr_broadaddr;

        inet_ntop(AF_INET,&broadcast->sin_addr.s_addr,ip,16); /* 转换成字符串,inet_ntop将二进制IP转换成点分十进制的字符串 */
        printf("BROADCAST IP is : %s\n",ip);
    }else
    {
        printf("BROADCAST IP is : 0.0.0.0\n",ip);
    }
    printf("----------------------------------\n");

#else

    memset(&ifr,0,sizeof(ifr));
    ifr.ifr_ifindex=2;  /* 获得第2个网络接口的名称 */

    err=ioctl(s,SIOCGIFNAME,&ifr);
    memcpy(ifr.ifr_name,argv[1],5);
    if(err){
        perror("index error");
    }else{
        printf("The %dst net device is : %s\n",ifr.ifr_ifindex,ifr.ifr_name);
    }


    err=ioctl(s,SIOCGIFHWADDR,&ifr);  /* 获得MAC地址 */
    if(!err){
        unsigned char* hw=ifr.ifr_hwaddr.sa_data;
        printf("Mac address is : %02x:%02x:%02x:%02x:%02x:%02x\n",hw[0],hw[1],hw[2],hw[3],hw[4],hw[5]);
    }else{
        printf("Mac address is : 00:00:00:00:00:00\n");
    }

    sin=(struct sockaddr_in*)&ifr.ifr_addr;
    memset(ip,0,16);
    err=ioctl(s,SIOCGIFADDR,&ifr);
    if(!err){
        inet_ntop(AF_INET,&sin->sin_addr.s_addr,ip,16);
        printf("IP address is : %s\n",ip);
    }else{
        printf("IP address is : 0.0.0.0\n");
    }

    err=ioctl(s,SIOCGIFBRDADDR,&ifr);  /* 得到接口的广播地址 */
    if(!err){
        struct sockaddr_in *broadcast=(struct sockaddr_in*)&ifr.ifr_broadaddr;
        inet_ntop(AF_INET,&broadcast->sin_addr.s_addr,ip,16);/* 转换成字符串,inet_ntop将二进制IP转换成点分十进制的字符串 */
        printf("BROADCAST IP is : %s\n",ip);
    }else{
        printf("BROADCAST IP is : 0.0.0.0\n",ip);
    }
#endif

    printf("----------------------------------\n");
    close(s);

}
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