linux下如何获取网卡IP地址及MAC地址

文件名: get_ipmac.c

代码:

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

#define MAXINTERFACES 16

int main(int argc, char **argv)
{
register int fd, interface, retn = 0;
struct ifreq buf[MAXINTERFACES];
struct arpreq arp;
struct ifconf ifc;
char mac[32] = "";

if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) >= 0) {
ifc.ifc_len = sizeof buf;
ifc.ifc_buf = (caddr_t) buf;
if (!ioctl(fd, SIOCGIFCONF, (char *) &ifc)) {
interface = ifc.ifc_len / sizeof(struct ifreq);
printf("interface num is interface=%d\n\n", interface);
while (interface-- > 0) {
printf("net device %s\n", buf[interface].ifr_name);

/*Jugde whether the net card status is promisc */
if (!(ioctl(fd, SIOCGIFFLAGS, (char *) &buf[interface]))) {
if (buf[interface].ifr_flags & IFF_PROMISC) {
printf("the interface is PROMISC");
retn ;
}
} else {
char str[256] = "";

sprintf(str, "cpm: ioctl device %s",
buf[interface].ifr_name);
perror(str);
}

/*Jugde whether the net card status is up */
if (buf[interface].ifr_flags & IFF_UP) {
printf("the interface status is UP\n");
} else {
printf("the interface status is DOWN\n");
}

/*Get IP of the net card */
if (!(ioctl(fd, SIOCGIFADDR, (char *) &buf[interface]))) {
printf("IP address is:");
printf("%s\n",
inet_ntoa(((struct sockaddr_in
*) (&buf[interface].ifr_addr))->
sin_addr));
} else {
char str[256] = "";

sprintf(str, "cpm: ioctl device %s",
buf[interface].ifr_name);
perror(str);
}

/*Get HW ADDRESS of the net card */
if (!(ioctl(fd, SIOCGIFHWADDR, (char *) &buf[interface]))) {
printf("HW address is:");

sprintf(mac, "%02x%02x%02x%02x%02x%02x",
(unsigned char) buf[interface].ifr_hwaddr.
sa_data[0],
(unsigned char) buf[interface].ifr_hwaddr.
sa_data[1],
(unsigned char) buf[interface].ifr_hwaddr.
sa_data[2],
(unsigned char) buf[interface].ifr_hwaddr.
sa_data[3],
(unsigned char) buf[interface].ifr_hwaddr.
sa_data[4],
(unsigned char) buf[interface].ifr_hwaddr.
sa_data[5]); // 利用sprintf转换成char *
printf("%s\n", mac);

printf("\n");
}

else {
char str[256];

sprintf(str, "cpm: ioctl device %s",
buf[interface].ifr_name);
perror(str);
}
} //end of while
} else
perror("cpm: ioctl");

} else
perror("cpm: socket");

close(fd);
return retn;
}

/********************************end********************************/

编译: gcc get_ipmac.c

运行: ./a.out

结果:

interface num is interface=4

net device eth2
the interface status is UP
IP address is:192.168.100.48
HW address is:00e04cd803ae

net device eth1
the interface status is UP
IP address is:192.168.60.48
HW address is:000aeb5f92ce

net device eth0
the interface status is UP
IP address is:192.168.80.48
HW address is:00d0b7b8b22e

net device lo
the interface status is UP
IP address is:127.0.0.1
HW address is:000000000000

--
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Name: Xiong Feng
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