获得eth0接口所有信息:
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <net/if.h>
#include <string.h>
unsigned char g_eth_name[16];
unsigned char g_macaddr[16];
unsigned int g_subnetmask;
unsigned int g_ipaddr;
unsigned int g_broadcast_ipaddr;
//初始化网络，获取当前网络设备信息
void init_net(void)
{
int i ;
int sock;
struct sockaddr_in sin;
struct ifreq ifr;
sock=socket(AF_INET, SOCK_DGRAM, 0);
if(sock==-1)
perror("socket");
strcpy(g_eth_name, "eth0");
strcpy(ifr.ifr_name, g_eth_name);
printf("eth name:\t%s\n", g_eth_name);
//获取并打印网卡地址
if(ioctl(sock, SIOCGIFHWADDR, &ifr) <0 )
perror("ioctl error\n");
memcpy(g_macaddr, ifr.ifr_hwaddr.sa_data, 6);
printf("local mac:\t");
for(i=0;i<5;i++)
printf("%.2x:", g_macaddr[i]);
printf("%.2x\n", g_macaddr[i]);
//获取并打印IP地址
if(ioctl(sock, SIOCGIFADDR, &ifr)<0)
perror("ioctl error\n");
memcpy(&sin, &ifr.ifr_addr, sizeof(sin));
g_ipaddr = sin.sin_addr.s_addr;
printf("local eth0:\t%s\n", inet_ntoa(sin.sin_addr));
//获取并打印广播地址
if(ioctl(sock, SIOCGIFBRDADDR, &ifr)<0)
perror("ioctl error\n");
memcpy(&sin, &ifr.ifr_addr, sizeof(sin));
g_broadcast_ipaddr = sin.sin_addr.s_addr;
printf("broadcast:\t%s\n", inet_ntoa(sin.sin_addr));
//获取并打印子网掩码
if(ioctl(sock,SIOCGIFNETMASK,&ifr)<0)
perror("ioctl error\n");
memcpy(&sin, &ifr.ifr_addr, sizeof(sin));
g_subnetmask = sin.sin_addr.s_addr;
printf("subnetmask:\t%s\n", inet_ntoa(sin.sin_addr));
close(sock);
}
int main()
{
//initialize
init_net();
//do something
//....
return 0;
}
获取所有IP:
#include <string.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <stdlib.h>
#include <stdio.h>
#include <linux/if.h>
#include <arpa/inet.h>
int main()
{
int i=0;
int sockfd;
struct ifconf ifconf;
unsigned char buf[512];
struct ifreq *ifreq;
//初始化ifconf
ifconf.ifc_len = 512;
ifconf.ifc_buf = buf;
if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
{
perror("socket open failure!\n" );
exit(1);
}
ioctl(sockfd, SIOCGIFCONF, &ifconf); //获取所有接口信息
//接下来一个一个的获取IP地址
ifreq = (struct ifreq*)buf;
for (i=(ifconf.ifc_len/sizeof (struct ifreq)); i>0; i--)
{
if(ifreq->ifr_flags == AF_INET)
{
printf("name = [%s] " , ifreq->ifr_name);
printf("local addr = [%s]",
inet_ntoa(((struct sockaddr_in*)&(ifreq->ifr_addr))->sin_addr));
printf();
ifreq++;
}
}
return 0;
}
获取本机的IP和MAC地址:
/* 得到本机的mac地址和ip地址 */
int GetLocalMac ( const char *device,char *mac,char *ip )
{
int sockfd;
struct ifreq req;
struct sockaddr_in * sin;
if ( ( sockfd = socket ( PF_INET,SOCK_DGRAM,0 ) ) ==-1 )
{
fprintf ( stderr,"Sock Error:%s\n\a",strerror ( errno ) );
return ( -1 );
}
memset ( &req,0,sizeof ( req ) );
strcpy ( req.ifr_name,device );
if ( ioctl ( sockfd,SIOCGIFHWADDR, ( char * ) &req ) ==-1 )
{
fprintf ( stderr,"ioctl SIOCGIFHWADDR:%s\n\a",strerror ( errno ) );
close ( sockfd );
return ( -1 );
}
memcpy ( mac,req.ifr_hwaddr.sa_data,6 );
req.ifr_addr.sa_family = PF_INET;
if ( ioctl ( sockfd,SIOCGIFADDR, ( char * ) &req ) ==-1 )
{
fprintf ( stderr,"ioctl SIOCGIFADDR:%s\n\a",strerror ( errno ) );
close ( sockfd );
return ( -1 );
}
sin = ( struct sockaddr_in * ) &req.ifr_addr;
memcpy ( ip, ( char * ) &sin->sin_addr,4 );
return ( 0 );
}