获取mac地址保存到字符数组并+1

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于 2014-10-11 00:10:24 发布

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分类专栏： linux系统编程文章标签： linux mac

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该程序从/etc/sysconfig/network-scripts/ifcfg-eth0文件中读取eth0的MAC地址，然后将MAC地址加1。通过遍历MAC地址字符串，对每个字符进行检查并递增，当达到'9'时转为'A'，达到'F'时转为'0'。最终输出加1后的MAC地址。

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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <iostream>

using namespace std;

#define IFCFG_ETH0   "/etc/sysconfig/network-scripts/ifcfg-eth0"
#define IFCFG_LO     "/etc/sysconfig/network-scripts/ifcfg-lo"
#define IFCFG_WLAN0  "/etc/sysconfig/network-scripts/ifcfg-wlan0"
#define HWADDR_LINE  7
#define MAXLINE      64

void inc_mac(char hwaddr[18]);

int main(int argc, char **argv)
{
    int i;
    char buf[MAXLINE] = {0};
    char hwaddr[MAXLINE] = {0};
    //get eth0 info and read the line :HWADDR=*****
    FILE *fp_ifcfg_eth0 = fopen(IFCFG_ETH0, "r");
    for(i = 1;i <= HWADDR_LINE;i++)
        fgets(buf, MAXLINE-1, fp_ifcfg_eth0);
    //fgets函数遇到换行符时会将其读进缓冲区中,也就所遇到换行符停止
    buf[strlen(buf)-1] = '\0';
    strncpy(hwaddr, buf+7, strlen(buf)-7);
    cout << "Now mac = " << hwaddr << endl;
    inc_mac(hwaddr); // mac + 1
    cout << "mac + 1 = " << hwaddr << endl;

    exit(0);
}

void inc_mac(char hwaddr[18])
{
    int i, m = 4, n, conunt = 0;
    for(i = 16;i >= 0;i--)
    {
        //skip ':'
        if(i == 2 + 3*m)
        { m--; continue; }
        
        //addr[i]++
        if(hwaddr[i] == '9')
        { hwaddr[i] = 'A'; break; }
        else if(hwaddr[i] == 'F')
        { hwaddr[i] = '0'; }
        else
        { hwaddr[i]++; break; }
    }
}