C语言实现linux网卡检测改进版

 C语言+shell 实现linux网卡状态检测  和 C语言实现linux网卡连接检测 2文的方法各有缺陷，比如有些系统执行ifconfig需要root权限，要不就不支持ioctl(fd, SIOCGMIIPHY, &ifr)这样的操作。以下给出了C语言实现linux网卡连接检测 的改进版实现与C语言+shell 实现linux网卡状态检测 同样的功能。

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <linux/if.h>
#include <linux/mii.h>
#include <linux/sockios.h>
#include <errno.h>
#include <ifaddrs.h>
#include <arpa/inet.h>
#include <linux/ethtool.h>
int cshell_netlink_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, "DEVICE_NONE\r\n");
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, "DEVICE_DOWN\r\n");
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, "DEVICE_LINKED\r\n");
return 3;
}
else
{
fprintf(stderr, "DEVICE_UNPLUGGED\r\n");
return 2;
}
}
}
return -1;
}
int c_netlink_status(const char *if_name )
{
int fd = -1;
struct ifreq ifr;
struct ifconf ifc;
struct ifreq ifrs_buf[100];
int if_number =0;
int i;
if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
{
fprintf(stderr, "%s: socket error [%d] %s\r\n",if_name, errno, strerror(errno));
close(fd);
return -1;
}
ifc.ifc_len = sizeof(ifrs_buf);
ifc.ifc_buf = (caddr_t)ifrs_buf;
if (ioctl(fd, SIOCGIFCONF, (char *)&ifc) <0)
{
fprintf(stderr, "%s: ioctl SIOCGIFCONF error [%d] %s\r\n",if_name, errno, strerror(errno));
close(fd);
return -1;
}
if_number = ifc.ifc_len / sizeof(struct ifreq);
for(i=0; i< if_number; i++)
{
if(strcmp(if_name,ifrs_buf[i].ifr_name ) == 0)
{
break;
}
}
if(i >= if_number)
{
close(fd);
fprintf(stderr, "DEVICE_NONE\r\n");
return 0;
}
bzero(&ifr, sizeof(ifr));
strncpy(ifr.ifr_name, if_name, IFNAMSIZ-1);
ifr.ifr_name[IFNAMSIZ-1] = 0;
if (ioctl(fd, SIOCGIFFLAGS, (char *)&ifr) <0)
{
fprintf(stderr, "%s: ioctl SIOCGIFFLAGS error [%d] %s\r\n",if_name, errno, strerror(errno));
close(fd);
return -1;
}
#if 1
if(!(ifr.ifr_flags & IFF_UP))
{
close(fd);
fprintf(stderr, "DEVICE_DOWN\r\n");
return 1;
}
if(!(ifr.ifr_flags & IFF_RUNNING))
{
close(fd);
fprintf(stderr, "DEVICE_UNPLUGGED\r\n");
return 2 ;
}
fprintf(stderr, "DEVICE_LINKED\r\n");
return 3;
#else
{
struct ethtool_value edata;
if(!(ifr.ifr_flags & IFF_UP) || !(ifr.ifr_flags & IFF_RUNNING))
{
close(fd);
fprintf(stderr, "%s: DOWN\r\n",if_name);
return 1;
}
edata.cmd = ETHTOOL_GLINK;
edata.data = 0;
ifr.ifr_data = (char *) &edata;
if(ioctl( fd, SIOCETHTOOL, &ifr ) < 0)
{
fprintf(stderr, "%s: ioctl SIOCETHTOOL error [%d] %s\r\n",if_name, errno, strerror(errno));
close(fd);
return -1;
}
if(edata.data == 0)
{
fprintf(stderr, "DEVICE_UNPLUGGED\r\n");
return 2;
}
else
{
fprintf(stderr, "DEVICE_LINKED\r\n");
return 3;
}
}
#endif
}
int main(int argc, char* argv[])
{
int i=0;
if(argc != 2)
{
fprintf(stderr, "usage: %s <ethname>\r\n", argv[0]);
return -1;
}
i = cshell_netlink_status(argv[1]);
printf( "cshell_netlink_status if_status = %d\n", i );
i = c_netlink_status(argv[1]);
printf( "c_netlink_status if_status = %d\n", i );
return 0;
}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。

您可能感兴趣的文章:

• C语言+shell实现linux网卡状态检测
• C语言实现linux网卡连接检测的方法
• C语言实现linux网卡检测精简版