怎么通过C语言自动生成MAC地址

最近在做虚拟机项目时，需要给创建的每一个虚拟机自动生成一个MAC地址，由于MAC地址为48位，而且格式是以：隔开的，所以下面我写了一个c程序，来自动生成MAC地址。

复制代码 代码如下:

//   MAC.c

#include<stdio.h>

#include<stdlib.h>

#include<time.h>

#include<unistd.h>

#define RANDOM(x) (rand()%x)

#define MAC_ADDR_LENGTH 12

#define FMT_MAC_ADDR_LEN (MAC_ADDR_LENGTH+5)

unsigned char HEXCHAR[16]={'0','1','2','3','4','5','6','7','8','9','A','B','C',

'D','E','F'};

unsigned char genMACAddr[MAC_ADDR_LENGTH];

unsigned char fmtMACAddr[FMT_MAC_ADDR_LEN]={'0','0','-','0','0','-','0','0','-',

'0','0','-','0','0','-','0','0'};

void formatMACAddr()

{

  unsigned short i=0;

  unsigned short n=0;

  for(i=0;i<MAC_ADDR_LENGTH;i++,n++)

  {

    if(fmtMACAddr[n]!='-')

    {

      fmtMACAddr[n]=genMACAddr[i];

    }

    else

    {

      n++;

      fmtMACAddr[n]=genMACAddr[i];

    }

  }

}

void main()

{

  unsigned short i=0;

  unsigned short n=0;

  srand(getpid());

  for(int i=0;i<MAC_ADDR_LENGTH;i++)

  {

    n=RANDOM(16);

    genMACAddr[i]=HEXCHAR[n];

  }

  formatMACAddr();

  printf("%s",fmtMACAddr);

}