C语言+shell实现linux网卡状态检测

本文实例为大家分享了C语言+shell实现linux网卡状态检测的具体代码，供大家参考，具体内容如下

不解释，直接上代码 要求linux环境具备grep和awk（awk可选）

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

int get_if_status(char *if_name)
{
  char  buffer[BUFSIZ];
 char  cmd[100];
  FILE  *read_fp;
  int    chars_read;
  int    ret =0;

  memset( buffer, 0, BUFSIZ );
  memset( cmd, 0, 100 );
 sprintf(cmd, "ifconfig -a | grep %s",if_name);
  read_fp = popen(cmd, "r");
  if ( read_fp != NULL )
  {
    chars_read = fread(buffer, sizeof(char), BUFSIZ-1, read_fp);
 pclose(read_fp);

    if (chars_read > 0)
    {
      ret = 1;
    }
    else
    {
  fprintf(stderr, "%s: NO FOUND\r\n",if_name);
  return 0;
    }
  }

 if(ret == 1)
 {
 memset( buffer, 0, BUFSIZ );
 memset( cmd, 0, 100 );
 sprintf(cmd, "ifconfig |grep %s",if_name);
 read_fp = popen(cmd, "r");
 if ( read_fp != NULL )
 {
   chars_read = fread(buffer, sizeof(char), BUFSIZ-1, read_fp);
   pclose(read_fp);

   if (chars_read > 0)
   {
     ret = 2;
   }
   else
   {
  fprintf(stderr, "%s: DOWN\r\n",if_name);
  return 1;
   }
 }
 }

 if(ret == 2)
 {
 memset( buffer, 0, BUFSIZ );
 memset( cmd, 0, 100 );
 sprintf(cmd, "ifconfig %s | grep RUNNING | awk '{print $3}'",if_name);
 read_fp = popen(cmd, "r");
 if ( read_fp != NULL )
 {
   chars_read = fread(buffer, sizeof(char), BUFSIZ-1, read_fp);
   pclose(read_fp);

   if (chars_read > 0)
   {
  fprintf(stderr, "%s: LINKED\r\n",if_name);
  return 3;
   }
   else
   {
  fprintf(stderr, "%s: UNPLUGGED\r\n",if_name);
  return 2;
   }
 }
 }

 return -1;
}

int main(int argc, char* argv[])
{
  int i=0;
 if(argc != 2)
 {
 fprintf(stderr, "usage: %s <ethname>", argv[0]);
 return -1;
 }

  i = get_if_status(argv[1]);
  printf( "if_status = %d\n", i );
  return 0;
}

嵌入式编译 mips-linux-gnu-gcc -mips32 -EL -mhard-float -Wall -o netlink netlink.c

测试结果

# ./netlink eth100
eth100: NO FOUND
if_status = 0
#
# ifconfig eth0 down
# ./netlink eth0
eth0: DOWN
if_status = 1
#
# ifconfig eth0 up
# ./netlink eth0
eth0: UNPLUGGED
if_status = 2
#
# ./netlink eth0
eth0: LINKED
if_status = 3

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