怎么通过C语言自动生成MAC地址

2020-01-26 15:50:41

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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。

// 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);
}