根据网络接口名获取IP&MASK实例

/*根据接口名获取IP实例*/

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

 

int main(void)

{

        int fd;   

        struct ifreq ifr;

        struct sockaddr_in *sin;

        char LocalIP[32];

        if((fd = socket(AF_INET, SOCK_RAW, IPPROTO_RAW)) == -1)

        {

                return -1;

        }

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

        ifr.ifr_addr.sa_family = AF_INET;

        strcpy(ifr.ifr_name, "eth0");

 

        if (ioctl(fd, SIOCGIFADDR, &ifr) == 0)

        {

                sin = (struct sockaddr_in *) &ifr.ifr_addr;

                strncpy(LocalIP, inet_ntoa(sin->sin_addr),16);

        }

        else

        {

                close(fd);

                return -1;

        }

        printf( "eth0 : %s\n", LocalIP );

        close(fd);

        return 0;

}

 

Makefile:

GetIPByIf : GetIPByIf.o

        gcc GetIPByIf.o -o GetIPByIf

 

GetIPByIf.o : GetIPByIf.c

        gcc -c GetIPByIf.c

 

.PHONY : clean

clean:

        rm *.o GetIPByIf

 

 

 

/*根据接口名获取子网掩码实例*/

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

int main(void)

{

        int fd;   

        struct ifreq ifr;

        struct sockaddr_in *sin;

        char LocalMask[32];

        if((fd = socket(AF_INET, SOCK_RAW, IPPROTO_RAW)) == -1)

        {

                return -1;

        }

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

        ifr.ifr_addr.sa_family = AF_INET;

        strcpy(ifr.ifr_name, "eth0");

 

        if (ioctl(fd, SIOCGIFNETMASK, &ifr) == 0)

        {

                sin = (struct sockaddr_in *) &ifr.ifr_netmask;

                strncpy(LocalMask, inet_ntoa(sin->sin_addr),16);

        }

        else

        {

                close(fd);

                return -1;

        }

        printf( "Mask of eth0 : %s\n", LocalMask );

        close(fd);

        return 0;

}

 

Makefile:

 

GetMaskByIf : GetMaskByIf.o

        gcc GetMaskByIf.o -o GetMaskByIf

GetMaskByIf.o : GetMaskByIf.c

        gcc -c GetMaskByIf.c

.PHONY : clean

clean:

        rm *.o GetMaskByIf