Obtain IP addresses and MAC addresses in Linux

# 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> # Ifdef Solaris
# Include <sys/sockio. h>
# Endif # Define maxinterfaces 16 Main (argc, argv)
Register int argc;
Register 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 ))
{
// Obtain Interface Information
Intrface = IFC. ifc_len/sizeof (struct ifreq );
Printf ("interface num is intrface = % d/n", intrface );
// Obtain the device IP address and MAC address cyclically Based on the excuse Information
While (intrface --> 0)
{
// Obtain the device name
Printf ("net device % s/n", Buf [intrface]. ifr_name );
 
// Determine the NIC type
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 );
} // Determine the NIC status
If (BUF [intrface]. ifr_flags & iff_up)
{
Puts ("the interface status is up ");
}
Else
{
Puts ("the interface status is down ");
} // Obtain the IP address of the current Nic
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 */
# Ifdef Solaris
// Obtain the MAC address
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 :"); // Display the MAC address in hexadecimal format
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: % 02x: % 02x: % 02x/N ",
(Unsigned char) BUF [intrface]. ifr_enaddr [0],
(Unsigned char) BUF [intrface]. ifr_enaddr [1],
(Unsigned char) BUF [intrface]. ifr_enaddr [2],
(Unsigned char) BUF [intrface]. ifr_enaddr [3],
(Unsigned char) BUF [intrface]. ifr_enaddr [4],
(Unsigned char) BUF [intrface]. ifr_enaddr [5]); Puts ("");
Puts ("");
}
# Endif
If (! (IOCTL (FD, siocgifhwaddr, (char *) & Buf [intrface])
{
Puts ("HW address is :"); Printf ("% 02x: % 02x: % 02x: % 02x: % 02x: % 02x/N ",
(Unsigned char) BUF [intrface]. ifr_hwaddr.sa_data [0],
(Unsigned char) BUF [intrface]. ifr_hwaddr.sa_data [1],
(Unsigned char) BUF [intrface]. ifr_hwaddr.sa_data [2],
(Unsigned char) BUF [intrface]. ifr_hwaddr.sa_data [3],
(Unsigned char) BUF [intrface]. ifr_hwaddr.sa_data [4],
(Unsigned char) BUF [intrface]. ifr_hwaddr.sa_data [5]); Puts ("");
Puts ("");
}
# Endif Else
{
Char STR [256]; Sprintf (STR, "CPM: IOCTL device % s", Buf [intrface]. ifr_name );
Perror (STR );
}
} // While
} Else
Perror ("CPM: IOCTL "); } Else
Perror ("CPM: socket "); Close (FD );
Return retn;
}