读ARP表

时间：2010-03-10 来源：PHP爱好者

#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <linux/sockios.h>
#include <net/if_arp.h>
#include <linux/in.h> int Main(char *ip,char * mac)
{ int sockfd;
unsigned char *ptr;
struct arpreq arp_req;
struct sockaddr_in *sin;
struct sockaddr_storage ss;
char addr[50];

memset(addr,0,sizeof(addr));
memset(&ss,0,sizeof(ss));

sockfd=socket(AF_INET,SOCK_DGRAM,0);
if(sockfd < 0)
{
  debugf("socket error\n");
  return -1;
}
memset(&arp_req,0,sizeof(arp_req));
sin = (struct sockaddr_in *) &ss;
arp_req.arp_pa.sa_family = AF_INET;

sin->sin_family = AF_INET;
if(inet_pton(AF_INET,ip,&(sin->sin_addr)) <= 0)
{
  debugf("inet_aton error ...\n");
  close(sockfd);
  return -1; }

sin = (struct sockaddr_in *) &arp_req.arp_pa;
memcpy(sin,&ss,sizeof(struct sockaddr_in));
strcpy(arp_req.arp_dev,"eth0");
strcpy(arp_req.arp_dev,InterfaceName);
arp_req.arp_ha.sa_family = AF_UNSPEC;

if(ioctl(sockfd,SIOCGARP,&arp_req) < 0)
{
  debugf("ioctl SIOCGARP: error\n");
  close(sockfd);
  return -1;
}
ptr = (unsigned char *) arp_req.arp_ha.sa_data; // debugf("%x:%x:%x:%x:%x:%x\n",*ptr,*(ptr+1),*(ptr+2),*(ptr+3),*(ptr+4),*(ptr+5));
sprintf(mac,"%x:%x:%x:%x:%x:%x",*ptr,*(ptr+1),*(ptr+2),*(ptr+3),*(ptr+4),*(ptr+5));
// debugf("Mac = %s ... \n",mac);
close(sockfd);
return 0;
}

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