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最新推荐文章于 2024-08-02 00:06:12 发布

原创最新推荐文章于 2024-08-02 00:06:12 发布 · 426 阅读

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#struct #include #network #socket

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本文提供了一个使用C语言实现的程序，用于检测网络链接是否断开，并获取本地主机的IP地址、MAC地址。通过调用系统命令`ifconfig`来检查网络状态，并使用socket编程获取IP地址、MAC地址和子网掩码。

#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>

/**********************************************************************
* 函数名称： GetNetStat
* 功能描述： 检测网络链接是否断开
* 输入参数： 
* 输出参数： 无
* 返 回 值： 正常链接1,断开返回-1
* 其它说明： 本程序需要超级用户权限才能成功调用ifconfig命令
***********************************************************************/ 
int GetNetStat( )
{
    char    buffer[BUFSIZ];
    FILE    *read_fp;
    int        chars_read;
    int        ret;
    
    memset( buffer, 0, BUFSIZ );
    read_fp = popen("ifconfig eth0 | grep RUNNING", "r");
    if ( read_fp != NULL ) 
    {
        chars_read = fread(buffer, sizeof(char), BUFSIZ-1, read_fp);
        if (chars_read > 0) 
        {
            ret = 1;
        }
        else
        {
            ret = -1;
        }
        pclose(read_fp);
    }
    else
    {
        ret = -1;
    }

    return ret;
}


int main()
{
    int i=0;
    i = GetNetStat();
    printf( "\nNetStat = %d\n", i );
    return 0;
}

#include <stdio.h>#include <sys/ioctl.h>#include <sys/socket.h>#include <sys/types.h>#include <netdb.h>#include <net/if.h>#include <arpa/inet.h>static int get_hostip(char *storeip){ int sfd, intr; struct ifreq buf[16]; struct ifconf ifc; sfd = socket (AF_INET, SOCK_DGRAM, 0); if (sfd < 0) return -1; ifc.ifc_len = sizeof(buf); ifc.ifc_buf = (caddr_t)buf; if (ioctl(sfd, SIOCGIFCONF, (char *)&ifc)) return -1; intr = ifc.ifc_len / sizeof(struct ifreq); while (intr-- > 0 && ioctl(sfd, SIOCGIFADDR, (char *)&buf[intr])); close(sfd); strcpy(storeip, inet_ntoa(((struct sockaddr_in*)(&buf[intr].ifr_addr))-> sin_addr));return 0;}

/*获取mac地址*/

#include <stdio.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <net/if.h>
#include <string.h>
static int GetMacAddr(char *WhichEth, char *MacAdd)
{
	struct ifreq 	IfReq;
	int				sock;
	if (NULL == MacAdd || NULL == WhichEth){
		return -1;
	}
	if((sock = socket(AF_INET,SOCK_STREAM, 0)) < 0){
        perror("socket");
        return -2;
	}
	strcpy(IfReq.ifr_name, WhichEth);
	if(ioctl(sock,SIOCGIFHWADDR,&IfReq) < 0){
                perror("ioctl");
                return -3;
    }
	sprintf(MacAdd, "%02x:%02x:%02x:%02x:%02x:%02x",
                        (unsigned char)IfReq.ifr_hwaddr.sa_data[0],
                        (unsigned char)IfReq.ifr_hwaddr.sa_data[1],
                        (unsigned char)IfReq.ifr_hwaddr.sa_data[2],
                        (unsigned char)IfReq.ifr_hwaddr.sa_data[3],
                        (unsigned char)IfReq.ifr_hwaddr.sa_data[4],
                        (unsigned char)IfReq.ifr_hwaddr.sa_data[5]);
	return 0;
	
}


#include <arpa/inet.h>
#include <arpa/nameser.h>
#include <netinet/in.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <ctype.h>
#include <ctype.h>
#include <errno.h>
#include <netdb.h>
#include <resolv.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <net/if.h>  
int GetIpAddr(const char *EthName, char *IpAddr)
{
	int Ret 	= -1;
	int Fd		= 0;
	int Intrface = 0;
	struct ifconf Ifc;
	struct ifreq IfreqBuff[16];
	if (0 > (Fd = socket(AF_INET, SOCK_DGRAM, 0))){
		goto ERR_EXIT;
	}
	
	Ifc.ifc_len  = sizeof(IfreqBuff);
	Ifc.ifc_buf  = (caddr_t)IfreqBuff;
	
	if(0 > ioctl(Fd, SIOCGIFCONF, (char *)&Ifc)){
		goto ERR_EXIT;
	}
	
	Intrface = Ifc.ifc_len / sizeof(struct ifreq);
	
	while (Intrface-- > 0){
		if (strstr(IfreqBuff[Intrface].ifr_name, EthName)){
			if (0 > ioctl(Fd, SIOCGIFADDR, (char *)&IfreqBuff[Intrface])){
				goto ERR_EXIT;
			}
			//sprintf (IpAddr, "%s", inet_ntoa(((struct sockaddr_in *)(&IfreqBuff[Intrface].ifr_addr))->sin_addr));
			sprintf (IpAddr, "%s", inet_ntoa(((struct sockaddr_in *)(&IfreqBuff[Intrface].ifr_hwaddr))->sin_addr));
			//printf ("addr [%s]", IpAddr);
		}
					sprintf (IpAddr, "%s", inet_ntoa(((struct sockaddr_in *)(&IfreqBuff[Intrface].ifr_dstaddr))->sin_addr));
			printf ("addr [%s]", IpAddr);
	}
	
	return 0;
ERR_EXIT:
return -1;
}

int GetMaskAddr(const char *EthName, char *MaskAddr)
{
	int Ret 	= -1;
	int Fd		= 0;
	int Intrface = 0;
	struct ifconf Ifc;
	struct ifreq IfreqBuff[16];
	if (0 > (Fd = socket(AF_INET, SOCK_DGRAM, 0))){
		goto ERR_EXIT;
	}
	
	Ifc.ifc_len  = sizeof(IfreqBuff);
	Ifc.ifc_buf  = (caddr_t)IfreqBuff;
	
	if(0 > ioctl(Fd, SIOCGIFCONF, (char *)&Ifc)){
		goto ERR_EXIT;
	}
	
	Intrface = Ifc.ifc_len / sizeof(struct ifreq);
	
	while (Intrface-- > 0){
		if (strstr(IfreqBuff[Intrface].ifr_name, EthName)){
			if (0 > ioctl(Fd, SIOCGIFNETMASK, (char *)&IfreqBuff[Intrface])){// SIOCGIFADDR
				goto ERR_EXIT;
			}
			sprintf (MaskAddr, "%s", inet_ntoa(((struct sockaddr_in *)(&IfreqBuff[Intrface].ifr_netmask))->sin_addr));
		}
	}
	
	return 0;
ERR_EXIT:
return -1;
}
//¹ã²¥ SIOCGIFBRDADDR  
//ip SIOCGIFADDR
//×ÓÍøÑÚÂë  SIOCGIFNETMASK
//io = ioctl(sockfd, SIOCGIFHWADDR, (char *)buffer);
int main()
{
	char ip[20];
	char mask[20];
	GetIpAddr("eth0",ip);
	puts(ip);
	GetMaskAddr("eth0",mask);
	puts(mask);
}