set.c

ip数据包截获

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<sys/socket.h>
#include<sys/types.h>
#include<sys/ioctl.h>
#include<netinet/if_ether.h>
#include<netdb.h>
#include<net/ethernet.h>
#include<net/if.h>
int set_promisc()
{
    int s;
    struct ifreq ifr;
    strcpy(ifr.ifr_name, "eth0");
    s=socket(PF_PACKET,SOCK_RAW,htons(ETH_P_IP));    
    if (s < 0) perror ("set promisc sock\n");
    if (ioctl(s, SIOCGIFFLAGS, &ifr) < 0) {
        printf("Could not receive flags for the interface.\n");
        exit(0);
    }
    ifr.ifr_flags |= IFF_PROMISC;
    if (ioctl(s, SIOCGIFFLAGS, &ifr) < 0) {
        printf("Could not set the PROMISC flag.\n");
        exit(0);
    }
    printf("Setting interface :::  eth0  ::: to promisc\n");
    return s;
}