Linux下檢測(cè)網(wǎng)卡與網(wǎng)線連接狀態(tài):
方法一:使用ioctl向socket發(fā)送SIOCETHTOOL 命令字
- #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網(wǎng)卡與網(wǎng)線是否連通:
# 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就表示網(wǎng)卡與網(wǎng)線正常鏈接,拔掉網(wǎng)線再運(yùn)行此命令就會(huì)發(fā)現(xiàn)RUNNING不在了。
linux系統(tǒng)提供了popen/pclose進(jìn)程管道讓C和shell很方便的交互,下面C代碼結(jié)合shell命令檢測(cè)網(wǎng)卡與網(wǎng)線連通狀況:
- #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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