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Linux下检测网卡与网线连接状态

2012-11-14 23:05 351 查看

Linux下检测网卡与网线连接状态：

方法一：使用ioctl向socket发送SIOCETHTOOL
[code]命令字

[cpp]
view plaincopy print ?

#include<stdio.h>

#include<stdlib.h>

#include<string.h>

#include <fcntl.h>

#include <errno.h>

#include <sys/ioctl.h>

#include <sys/types.h>

#include <sys/socket.h>

#include <linux/if.h>

#include <linux/sockios.h>

#include <linux/ethtool.h>

int get_netlink_status(constchar *if_name);

int main()
{
if(getuid()!= 0)
{
fprintf(stderr,"Netlink Status Check Need Root Power.\n");
return 1;
}

printf("Net link status: %d\n", get_netlink_status("eth0"));

return 0;
}

// if_name like "ath0", "eth0". Notice: call this function

// need root privilege.

// return value:

// -1 -- error , details can check errno

// 1 -- interface link up

// 0 -- interface link down.

int get_netlink_status(constchar *if_name)
{
int skfd;
struct ifreq ifr;
struct ethtool_value edata;

edata.cmd = ETHTOOL_GLINK;
edata.data = 0;

memset(&ifr, 0,sizeof(ifr));
strncpy(ifr.ifr_name, if_name,sizeof(ifr.ifr_name)- 1);
ifr.ifr_data =(char *) &edata;

if (( skfd= socket(AF_INET, SOCK_DGRAM, 0 )) < 0)
return -1;

if(ioctl( skfd, SIOCETHTOOL,&ifr ) == -1)
{
close(skfd);
return -1;
}

close(skfd);
return edata.data;

}

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

#include <fcntl.h>
#include <errno.h>
#include <sys/ioctl.h>

#include <sys/types.h>
#include <sys/socket.h>
#include <linux/if.h>
#include <linux/sockios.h>
#include <linux/ethtool.h>

int get_netlink_status(constchar *if_name);

int main()
{
if(getuid()!= 0)
{
fprintf(stderr,"Netlink Status Check Need Root Power.\n");
return 1;
}

printf("Net link status: %d\n", get_netlink_status("eth0"));

return 0;
}

// if_name like "ath0", "eth0". Notice: call this function
// need root privilege.
// return value:
// -1 -- error , details can check errno
// 1 -- interface link up
// 0 -- interface link down.
int get_netlink_status(constchar *if_name)
{
int skfd;
struct ifreq ifr;
struct ethtool_value edata;

edata.cmd = ETHTOOL_GLINK;
edata.data = 0;

memset(&ifr, 0,sizeof(ifr));
strncpy(ifr.ifr_name, if_name,sizeof(ifr.ifr_name)- 1);
ifr.ifr_data =(char *) &edata;

if (( skfd= socket(AF_INET, SOCK_DGRAM, 0 )) < 0)
return -1;

if(ioctl( skfd, SIOCETHTOOL,&ifr ) == -1)
{
close(skfd);
return -1;
}

close(skfd);
return edata.data;

}

方法二：使用ifconfigl命令能很方便的查看网卡与网线是否连通：

# ifconfig eth0

eth0      Link encap:Ethernet  HWaddr 00:25:35:68:CC:D6

inet addr:192.168.1.168  Bcast:192.168.1.255  Mask:255.255.255.0

inet6 addr: fe80::215:c5ff:fe18:ccd6/64 Scope:Link

UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

RX packets:130722 errors:0 dropped:0 overruns:0 frame:0

TX packets:112560 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

RX bytes:104371099 (99.5 MiB)  TX bytes:20518584 (19.5 MiB)

Interrupt:16

其中的RUNNING就表示网卡与网线正常链接，拔掉网线再运行此命令就会发现RUNNING不在了。

linux系统提供了popen/pclose进程管道让C和shell很方便的交互，下面C代码结合shell命令检测网卡与网线连通状况：

[cpp]
view plaincopy print ?

#include <unistd.h>

#include <stdlib.h>

#include <stdio.h>

#include <string.h>

int GetNetStat( )
{
char buffer[BUFSIZ];
FILE *read_fp;
int chars_read;
int ret;

memset( buffer, 0, BUFSIZ );
read_fp = popen("ifconfig eth0 | grep RUNNING", "r");
if ( read_fp != NULL )
{
chars_read = fread(buffer, sizeof(char), BUFSIZ-1, read_fp);
if (chars_read > 0)
{
ret = 1;
}
else
{
ret = -1;
}
pclose(read_fp);
}
else
{
ret = -1;
}

return ret;
}

int main()
{
int i=0;
i = GetNetStat();
printf( "\nNetStat = %d\n", i );
return 0;
}

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