Linux下枚举系统中网卡的信息(一)

现在需要在Linux下编写一个千兆网相机的动态库,需要些Linux网络编程方面的知识,在网上查到一个枚举多网卡信息的实例,

摘抄下来.

#include
#include
#include

#include
#include
#include
#include
#include
#include
#include

#ifdef SOLARIS
#include
#endif

#define MAXINTERFACES 16

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

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)) {
intrface = ifc.ifc_len / sizeof (struct ifreq);
printf("interface num is intrface=%d\n\n\n",intrface);
while (intrface-- > 0)
{
printf ("net device %s\n", buf[intrface].ifr_name);

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

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

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

/*Get IP of the net card */
if (!(ioctl (fd, SIOCGIFADDR, (char *) &buf[intrface])))
{
puts ("IP address is:");
puts(inet_ntoa(((struct sockaddr_in*)(&buf[intrface].ifr_addr))->sin_addr));
puts("");
//puts (buf[intrface].ifr_addr.sa_data);
}
else {
char str[256];

sprintf (str, "cpm: ioctl device %s", buf[intrface].ifr_name);
perror (str);
}
/* this section can't get Hardware Address,I don't know whether the reason is module driver*/
// ((struct sockaddr_in*)&arp.arp_pa)->;sin_addr=((struct sockaddr_in*)(&buf[intrface].ifr_addr))->sin_addr;
#ifdef SOLARIS
arp.arp_pa.sa_family = AF_INET;
arp.arp_ha.sa_family = AF_INET;
((struct sockaddr_in*)&arp.arp_pa)->sin_addr.s_addr=((struct sockaddr_in*)(&buf[intrface].ifr_addr))->sin_addr.s_addr;
if (!(ioctl (fd, SIOCGARP, (char *) &arp)))
{
puts ("HW address is:");

printf("%02x:%02x:%02x:%02x:%02x:%02x\n",
(unsigned char)arp.arp_ha.sa_data[0],
(unsigned char)arp.arp_ha.sa_data[1],
(unsigned char)arp.arp_ha.sa_data[2],
(unsigned char)arp.arp_ha.sa_data[3],
(unsigned char)arp.arp_ha.sa_data[4],
(unsigned char)arp.arp_ha.sa_data[5]);

puts("");
puts("");
}

#else
#if 0
/*Get HW ADDRESS of the net card */
if (!(ioctl (fd, SIOCGENADDR, (char *) &buf[intrface])))
{
puts ("HW address is:");

printf("%02x:%02x:%02x:%