get_interface.c

#include <arpa/inet.h>
#include <net/if.h>
#include <net/if_arp.h>
#include <netinet/in.h>
#include <stdio.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>

#include <netinet/ether.h>
#include "get_interface.h"

int interface_num = 0;                  // 接口数量
INTERFACE net_interface[MAXINTERFACES]; // 接口数据

/******************************************************************
函	数:	int get_interface_num()
功	能:	获取接口数量
参	数:	无
*******************************************************************/
int get_interface_num()
{
    return interface_num;
}

/******************************************************************
函	数:	int getinterface()
功	能:	获取接口信息
参	数:	无
*******************************************************************/
void getinterface()
{
    struct ifreq buf[MAXINTERFACES]; /* ifreq结构数组 */
    struct ifconf ifc;               /* ifconf结构 */

    int sock_raw_fd = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
    /* 初始化ifconf结构 */
    ifc.ifc_len = sizeof(buf);
    ifc.ifc_buf = (caddr_t)buf;

    /* 获得接口列表 */
    if (ioctl(sock_raw_fd, SIOCGIFCONF, (char *)&ifc) == -1)
    {
        perror("SIOCGIFCONF ioctl");
        return;
    }
    interface_num = ifc.ifc_len / sizeof(struct ifreq); /* 接口数量 */
    printf("interface_num=%d\n\n", interface_num);
    char buff[20] = "";
    int ip;
    int if_len = interface_num;
    while (if_len-- > 0)
    {                                                                    /* 遍历每个接口 */
        printf("%s\n", buf[if_len].ifr_name);                            /* 接口名称 */
        sprintf(net_interface[if_len].name, "%s", buf[if_len].ifr_name); /* 接口名称 */
        printf("-%d-%s--\n", if_len, net_interface[if_len].name);
        /* 获得接口标志 */
        if (!(ioctl(sock_raw_fd, SIOCGIFFLAGS, (char *)&buf[if_len])))
        {
            /* 接口状态 */
            if (buf[if_len].ifr_flags & IFF_UP)
            {
                printf("UP\n");
                net_interface[if_len].flag = 1;
            }
            else
            {
                printf("DOWN\n");
                net_interface[if_len].flag = 0;
            }
        }
        else
        {
            char str[256];
            sprintf(str, "SIOCGIFFLAGS ioctl %s", buf[if_len].ifr_name);
            perror(str);
        }

        /* IP地址 */
        if (!(ioctl(sock_raw_fd, SIOCGIFADDR, (char *)&buf[if_len])))
        {
            printf("IP:%s\n", (char *)inet_ntoa(((struct sockaddr_in *)(&buf[if_len].ifr_addr))->sin_addr));
            bzero(buff, sizeof(buff));
            sprintf(buff, "%s", (char *)inet_ntoa(((struct sockaddr_in *)(&buf[if_len].ifr_addr))->sin_addr));
            inet_pton(AF_INET, buff, &ip);
            memcpy(net_interface[if_len].ip, &ip, 4);
        }
        else
        {
            char str[256];
            sprintf(str, "SIOCGIFADDR ioctl %s", buf[if_len].ifr_name);
            perror(str);
        }

        /* 子网掩码 */
        if (!(ioctl(sock_raw_fd, SIOCGIFNETMASK, (char *)&buf[if_len])))
        {
            printf("netmask:%s\n", (char *)inet_ntoa(((struct sockaddr_in *)(&buf[if_len].ifr_addr))->sin_addr));
            bzero(buff, sizeof(buff));
            sprintf(buff, "%s", (char *)inet_ntoa(((struct sockaddr_in *)(&buf[if_len].ifr_addr))->sin_addr));
            inet_pton(AF_INET, buff, &ip);
            memcpy(net_interface[if_len].netmask, &ip, 4);
        }
        else
        {
            char str[256];
            sprintf(str, "SIOCGIFADDR ioctl %s", buf[if_len].ifr_name);
            perror(str);
        }

        /* 广播地址 */
        if (!(ioctl(sock_raw_fd, SIOCGIFBRDADDR, (char *)&buf[if_len])))
        {
            printf("br_ip:%s\n", (char *)inet_ntoa(((struct sockaddr_in *)(&buf[if_len].ifr_addr))->sin_addr));
            bzero(buff, sizeof(buff));
            sprintf(buff, "%s", (char *)inet_ntoa(((struct sockaddr_in *)(&buf[if_len].ifr_addr))->sin_addr));
            inet_pton(AF_INET, buff, &ip);
            memcpy(net_interface[if_len].br_ip, &ip, 4);
        }
        else
        {
            char str[256];
            sprintf(str, "SIOCGIFADDR ioctl %s", buf[if_len].ifr_name);
            perror(str);
        }

        /*MAC地址 */
        if (!(ioctl(sock_raw_fd, SIOCGIFHWADDR, (char *)&buf[if_len])))
        {
            printf("MAC:%02x:%02x:%02x:%02x:%02x:%02x\n\n",
                   (unsigned char)buf[if_len].ifr_hwaddr.sa_data[0],
                   (unsigned char)buf[if_len].ifr_hwaddr.sa_data[1],
                   (unsigned char)buf[if_len].ifr_hwaddr.sa_data[2],
                   (unsigned char)buf[if_len].ifr_hwaddr.sa_data[3],
                   (unsigned char)buf[if_len].ifr_hwaddr.sa_data[4],
                   (unsigned char)buf[if_len].ifr_hwaddr.sa_data[5]);
            memcpy(net_interface[if_len].mac, (unsigned char *)buf[if_len].ifr_hwaddr.sa_data, 6);
        }
        else
        {
            char str[256];
            sprintf(str, "SIOCGIFHWADDR ioctl %s", buf[if_len].ifr_name);
            perror(str);
        }
    }                   // –while end
    close(sock_raw_fd); // 关闭socket
}