linux下设置网卡为 混杂模式 的程序！

linux下设置网卡为 混杂模式 的程序！

#include "sys/types.h"
#include "netinet/in.h"
#include "arpa/inet.h"
#include "errno.h"
#include "netdb.h"
#include "net/if.h"
#include "sys/ioctl.h"

extern int errno;

int open_fd() {
          int f, s;
          struct ifreq ifr;
          if ((f = socket(AF_INET, SOCK_PACKET, htons(ETH_P_ALL))) < 0)return -1;

//         if ((f = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL))) < 0)return -1;

          strcpy(ifr.ifr_name, "eth0");
          if ((s = ioctl(f, SIOCGIFFLAGS, &ifr)) < 0) {
                  close(f);
                  return(-1);
          }
          ifr.ifr_flags |= IFF_PROMISC;
          if ((s = ioctl(f, SIOCSIFFLAGS, &ifr)) < 0)
          {
                  return(-1);
          }
          printf("Setting interface ::: %s ::: to promisc\n\n", ifr.ifr_name);
          return(f);
  }
 
int main() {
        open_fd();
}

sock_fd = socket( PF_PACKET, SOCK_RAW, htons(ETH_P_ALL));

sock_fd = socket( AF_INET,   SOCK_PACKET, htons(ETH_P_ALL));  //已经过时

 

表示接收所有类型的数据帧 ip arp rarp