c/c++ 网络编程 UDP 改变网卡的硬件地址

网络编程 udp 改变网卡的硬件地址

在程序里动态改变网卡的硬件地址

1，取得网卡的硬件地址

#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <netinet/in.h>
#include <net/if.h>

int main(){
  int fd;
  ifreq ifr;

  fd = socket(af_inet, sock_dgram, 0);
  strncpy(ifr.ifr_name, "enp0s3", ifnamsiz - 1);
  if(ioctl(fd, siocgifhwaddr, &ifr) != 0){
    perror("ioctl");
    return 1;
  }
  close(fd);

  printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x\n",
     (unsigned char)ifr.ifr_hwaddr.sa_data[0],
     (unsigned char)ifr.ifr_hwaddr.sa_data[1],
     (unsigned char)ifr.ifr_hwaddr.sa_data[2],
     (unsigned char)ifr.ifr_hwaddr.sa_data[3],
     (unsigned char)ifr.ifr_hwaddr.sa_data[4],
     (unsigned char)ifr.ifr_hwaddr.sa_data[5]);
}

2，改变网卡的硬件地址

#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <netinet/in.h>
#include <net/if.h>
#include <net/if_arp.h>

int main(){
  int fd;
  ifreq ifr;

  fd = socket(af_inet, sock_dgram, 0);

  ifr.ifr_hwaddr.sa_family = arphrd_ether;

  ifr.ifr_hwaddr.sa_data[0] = 0xaa;
  ifr.ifr_hwaddr.sa_data[1] = 0xbb;
  ifr.ifr_hwaddr.sa_data[2] = 0xcc;
  ifr.ifr_hwaddr.sa_data[3] = 0xdd;
  ifr.ifr_hwaddr.sa_data[4] = 0xee;
  ifr.ifr_hwaddr.sa_data[5] = 0xff;
  
  strncpy(ifr.ifr_name, "enp0s3", ifnamsiz - 1);
  if(ioctl(fd, siocsifhwaddr, &ifr) != 0){
    perror("ioctl");
    return 1;
  }
}

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