c-router-emulator/router/get_interface/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
}