The method of obtaining Native MAC/IP address by linux
Function: query local IP/MAC address and filter out 127.0.0.1 loop-back address
Applicable: linux, ubuntu 16.04 debugging passed
# include
# include
# include
# include
# include
# include
# include
# include
# include
# include
# include
# include
# include
# include
# include
Void getLocalMacIp ()
{
Int i
Int sock_mac
Char hname [128]
Struct hostent * hent
Struct in_addr * paddr = 0
Struct ifaddrs * ifAddrStruct=NULL
Struct ifreq ifr_mac
Void * tmpAddrPtr=NULL
Struct ifreq buf [16]
Struct ifconf ifc
Int interface_num
Char nif_name [128] = {0}
Char addressBuffer [128]
Unsigned char macaddr [6] = {0}
Unsigned char * pFirstByte
/ /-
/ / get device IP address, discard loopback
/ /-
Gethostname (hname, sizeof (hname))
Hent = gethostbyname (hname)
Printf ("[% s] [% d] host:% s\ n", _ _ FILE__, _ LINE__, hent- > h_name)
Getifaddrs & ifAddrStruct)
While (ifAddrStructneighbor null)
{
If (ifAddrStruct- > ifa_addr- > sa_family==AF_INET)
{
TmpAddrPtr = & ((struct sockaddr_in *) ifAddrStruct- > ifa_addr)-> sin_addr
PFirstByte = (unsigned char*) tmpAddrPtr
If (* pFirstByte! = 127)
{
Paddr = tmpAddrPtr
Inet_ntop (AF_INET, tmpAddrPtr, addressBuffer, 128)
Printf ("[% s] [% d] NIF% s address% s\ n", _ _ FILE__, _ _ LINE__
IfAddrStruct- > ifa_name, addressBuffer)
/ /-
/ / remember NIF name for future use
/ /-
Strcpy (nif_name, ifAddrStruct- > ifa_name)
}
}
IfAddrStruct=ifAddrStruct- > ifa_next
}
/ /-
/ / get device MAC address, discard loopback
/ /-
Sock_mac = socket (AF_INET, SOCK_DGRAM, 0)
If (sock_mac > 0)
{
Ifc.ifc_len = sizeof (buf)
Ifc.ifc_req = buf
Ioctl (sock_mac, SIOCGIFCONF, (char *) & ifc)
Interface_num = ifc.ifc_len / sizeof (struct ifreq)
While (interface_num--)
{
If (nif_name [0] & & strcmp (nif_name, BUF [interface _ num] .ifr _ name))
{
Continue
}
Ioctl (sock_mac, SIOCGIFHWADDR, (char *) & BUF [interface _ num])
Memcpy (macaddr, & buf [interface _ num] .ifr _ hwaddr.sa_data [0], 6)
/ / printf ("NIF% s", buf [interface _ num] .ifr _ name)
/ / printf ("mac x:x:x:x:x:x\ n"
/ / macaddr [0], macaddr [1], macaddr [2], macaddr [3], macaddr [4], macaddr [5])
}
Close (sock_mac)
}
}
