用C/C++实现linux下检测网络接口状态

本文实例为大家分享了使用C/C++实现linux下检测网络接口状态,供大家参考,具体内容如下

要写个检测网络接口链接状态的东西,又不喜欢不断的ping别的地址,也不想调用其他命令行工具来做这个,于是在google了n多内容未果之后,搜到个检测工具的源代码。

以下代码在fedora 9 / CentOS 5.2下调试通过:)

#include <sys/types.h>

#include <string.h>

#include <stdlib.h>

#include <sys/ioctl.h>

#include <stdio.h>

#include <errno.h>

#include <net/if.h>

struct ethtool_value

{

__uint32_t cmd;

__uint32_t data;

};

/*return 1:has cable; return 0:no cable*/

int detect_eth_cable(char *ifname)

{

struct ethtool_value edata;

struct ifreq ifr;

int fd = -1, err = 0;

memset(&ifr, 0, sizeof(ifr));

strcpy(ifr.ifr_name, ifname);

fd = socket(AF_INET, SOCK_DGRAM, 0);

if (fd < 0) {

//perror("Cannot get control socket");

return -1;

}

edata.cmd = 0x0000000A;

ifr.ifr_data = (caddr_t)&edata;

err = ioctl(fd, 0x8946, &ifr);

if (err == 0) {

fprintf(stdout, "Link detected: %s\n", edata.data ? "yes":"no");

} else if (errno != EOPNOTSUPP) {

perror("Cannot get link status");

}

return(edata.data==1 ? 1:0);

}

int main(int argc, char**argv)

{

detect_eth_cable("p1p1");

return 0;

}

其他代码:

int get_netportstatus(const char *interface) {

char cmd[1024];

char *tt;

FILE *fp;

int devflag;

devflag=get_netflag(interface);

if (devflag==DEV_DOWN) {

sprintf(cmd,"ifconfig %s up",interface);

system(cmd);

}

sprintf(cmd,"ethtool %s | grep \"Link detected\" > /tmp/eth.temp",interface);

system(cmd);

if (devflag==DEV_DOWN) {

sprintf(cmd,"ifconfig %s down",interface);

system(cmd);

}

fp=fopen("/tmp/eth.temp","r");

if (fp==NULL) {

system("rm -rf /tmp/eth.temp");

return -1;

}

fgets(cmd,1024,fp);

fclose(fp);

system("rm -rf /tmp/eth.temp");

tt=strstr(cmd,"no");

if (tt!=NULL) return LINK_DOWN;

tt=strstr(cmd,"yes");

if (tt!=NULL) return LINK_UP;

return -1;

}


#include <sys/types.h>

#include <string.h>

#include <stdlib.h>

#include <sys/ioctl.h>

#include <stdio.h>

#include <errno.h>

#include <net/if.h>

struct ethtool_value {

__uint32_t cmd;

__uint32_t data;

};

int main(int , char* [])

{

struct ethtool_value edata;

int fd = -1, err = 0;

struct ifreq ifr;

memset(&ifr, 0, sizeof(ifr));

strcpy(ifr.ifr_name, "eth0");

fd = socket(AF_INET, SOCK_DGRAM, 0);

if (fd < 0) {

perror("Cannot get control socket");

return 70;

}

edata.cmd = 0x0000000a;

ifr.ifr_data = (caddr_t)&edata;

err = ioctl(fd, 0x8946, &ifr);

if (err == 0) {

fprintf(stdout, "Link detected: %s\n",

edata.data ? "yes":"no");

} else if (errno != EOPNOTSUPP) {

perror("Cannot get link status");

}

return 0;

}

#include <net if.h=""> // IFF_RUNNING

//如果网卡已脸上网线,返回0,否则返回-1.

int check_nic(char *nic)

{

struct ifreq ifr;

int skfd = socket(AF_INET, SOCK_DGRAM, 0);

strcpy(ifr.ifr_name, nic_name);

if (ioctl(skfd, SIOCGIFFLAGS, &ifr) < 0)

{

return -1;

}

if(ifr.ifr_flags & IFF_RUNNING)

return 0; // 网卡已插上网线

else return -1;

}

</net>

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