linux网络状态测试

//facename.c 枚举出iface使用的是／proc／net／dev文件

#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <net/if.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>

#define LINE_MAX          512
#define PATH_PROC_NET_DEV "/proc/net/dev"

int main(int argc, char *argv[])
{
        FILE * fp;
        char line[LINE_MAX];
        char * tmp,i=0;
        char interfacename[32][32];
        if(!(fp = fopen(PATH_PROC_NET_DEV, "r")))
        {
                perror("fopen");
                exit(1);
        }

        fgets(line, sizeof(line), fp);
        fgets(line, sizeof(line), fp);
        while(fgets(line, sizeof(line), fp))
        {
                if((tmp = strchr(line,':')))
                {
                        *tmp = '\0';
                        tmp = line;
                        while(*tmp ==' ')
                        {
                                tmp++;
                        }
                        strcpy(interfacename[i],tmp);
                        printf("%s\n", tmp);
                        i++;
                }
        }
        fclose(fp);
        for(i=i-1;i>=0;i--)
        {
                printf("%s\n", interfacename[i]);
        }
        exit(0);
}

/****************************************************************************************/
//phy_ioctrl.c 使用ioctrl测试网络状态，

#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(char argc,char**argv)
{
        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)
        {
                printf("Link detected:%s\n",edata.data? "yes":"no");
        }
        else if(errno != EOPNOTSUPP)
        {
                perror("cannot get link status");
        }
        return 0;
}

/*********************************************************************/
iface_name.c

#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <net/if.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>

#define IF_MAX            30

int main(int argc, char *argv[])
{
        int numreqs = 10;
        int fd;
        int i;
        struct ifreq * ifr = NULL;
        struct ifconf ifc;

        if((fd = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
        {
                perror("socket");
                exit(1);
        }

        ifc.ifc_len = sizeof(struct ifreq) * numreqs;
        ifc.ifc_buf = malloc(ifc.ifc_len);
        memset(ifc.ifc_buf, 0, ifc.ifc_len);

        if(ioctl(fd, SIOCGIFCONF, &ifc) != 0)
        {
                perror("SIOCGIFCONF");
                free(ifc.ifc_buf);
                close(fd);
                exit(1);
        }

        close(fd);

        if(ifc.ifc_len == sizeof(struct ifreq) * numreqs)
        printf("The system has at least %d interfaces, "
                "please increase the buffer.\n", numreqs);

        ifr = ifc.ifc_req;

        printf("Interfaces in the system (by SIOCGIFCONF):\n");
        printf("--------------------------------------------------\n");
        for(i=0; i<ifc.ifc_len; i+=sizeof(struct ifreq))
        {
                printf("%s\n", ifr->ifr_name);
                ifr++;
        }

        free(ifc.ifc_buf);

        exit(0);
}

/**************************************************************************/