How to obtain IP address and MAC Adr in Linux

Methods for obtaining IP and MAC Adr in Linux: struct ifreq {char ifr_name [IFNAMSIZ]; union {struct sockaddr ifru_addr; struct sockaddr Dr; short ifru_flags; int ifru_metric; caddr_t ifru_data;} ifr_ifru;}; www.2cto.com # include <net/if. h> # include <net/if_arp.h> # include <arpa/inet. h> # include <errno. h> # define ETH_NAME "eth0" int main () {int sock; struct sockaddr_in sin; struct ifreq ifr; unsigned char arp [6]; www.2cto.com sock = socket (AF_INET, SOCK_DGRAM, 0); if (sock =-1) {perror ("socket"); return-1;} strncpy (ifr. ifr_name, ETH_NAME, IFNAMSIZ); ifr. ifr_name [IFNAMSIZ-1] = 0; if (ioctl (sock, SIOCGIFADDR, & ifr) = 0) // obtain ip {memcpy (& sin, & ifr. ifr_addr, sizeof (sin); fprintf (stdout, "eth0: % s \ n", inet_ntoa (sin. sin_addr);} www.2cto.com if (ioctl (sock, SIOCGIFHWADDR, & ifr) = 0) // obtain mac {memcpy (arp, ifr. ifr_hwaddr.sa_data, 6); printf ("adapter hardware address x: x \ n", arp [0], arp [1], arp [2], arp [3], arp [4], arp [5]);} return 0 ;}