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电梯直达

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发表于 2008-08-27 16:54 |只看该作者 |倒序浏览

#include <stdio.h>
#include <string.h>
int main()
{
FILE *fpr;
char devicecfg[50];
char *device="eth0";
sprintf(devicecfg,"/etc/sysconfig/network-scripts/ifcfg-%s",device);
char buf[1024],*p;
int i;
char gwIP[20]={0};

if((fpr=fopen(devicecfg, "r"))==NULL)
{
      printf("open device config faile\n");
      return -1;
}
memset(buf, 0, sizeof(buf));
while(fgets(buf, sizeof(buf),fpr)!= NULL)
{
      if(NULL == (p=strstr(buf,"GATEWAY="))) continue;
      p=p+8;
      strncpy(gwIP,p,strlen(p)-1);
      break;
}
fclose(fpr);
printf("%s\n",gwIP);
return 0;
}

[ 本帖最后由 hackersea 于 2008-8-27 22:42 编辑 ]

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hackersea

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2楼 [报告]

发表于 2008-08-27 17:02 |只看该作者

调用演示...

#include <stdio.h>
#include <string.h>
int main()
{
char gwIP[20]={0};
get_gw_ip(gwIP);
printf("%s\n",gwIP);
return 0;
}

int get_gw_ip(char gwIP[])
{
FILE *fpr;
char devicecfg[50];
char *device="eth0";
sprintf(devicecfg,"/etc/sysconfig/network-scripts/ifcfg-%s",device);
char buf[1024],*p;
int i;

memset(gwIP,0,sizeof(gwIP));

if((fpr=fopen(devicecfg, "r"))==NULL)
{
      printf("open device config failedn");
      return -1;
}
memset(buf, 0, sizeof(buf));
while(fgets(buf, sizeof(buf),fpr)!= NULL)
{
      if(NULL == (p=strstr(buf,"GATEWAY="))) continue;
      p=p+8;
      strncpy(gwIP,p,strlen(p)-1);
      break;
}
fclose(fpr);
if(0==strlen(gwIP))
return -1;
else
return 0;
}

[ 本帖最后由 hackersea 于 2008-8-27 22:42 编辑 ]