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]);

}

github源代码

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;

  }

}

github源代码

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