#include "unp.h" #include #ifdef HAVE_SOCKADDR_DL_STRUCT #include #include #endif int main(int argc, char **argv) { int sockfd, len; char *ptr, buf[2048], addrstr[INET_ADDRSTRLEN]; struct ifconf ifc; struct ifreq *ifr; struct sockaddr_in *sinptr; if ( (sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) err_sys("socket error"); ifc.ifc_len = sizeof(buf); ifc.ifc_req = (struct ifreq *) buf; if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0) err_sys("ioctl SIOCGIFCONF error"); for (ptr = buf; ptr < buf + ifc.ifc_len; ) { ifr = (struct ifreq *) ptr; len = sizeof(struct sockaddr); #ifdef HAVE_SOCKADDR_SA_LEN if (ifr->ifr_addr.sa_len > len) len = ifr->ifr_addr.sa_len; /* length > 16 */ #endif ptr += sizeof(ifr->ifr_name) + len; /* for next one in buffer */ switch (ifr->ifr_addr.sa_family) { case AF_INET: sinptr = (struct sockaddr_in *) &ifr->ifr_addr; printf("%s\t%s\n", ifr->ifr_name, Inet_ntop(AF_INET, &sinptr->sin_addr, addrstr, sizeof(addrstr))); break; #ifdef AF_INET6 case AF_INET6: { struct sockaddr_in6 *sin6ptr; char addr6str[INET6_ADDRSTRLEN]; sin6ptr = (struct sockaddr_in6 *) &ifr->ifr_addr; printf("%s\t%s\n", ifr->ifr_name, Inet_ntop(AF_INET6, &sin6ptr->sin6_addr, addr6str, sizeof(addr6str))); break; } #endif #ifdef HAVE_SOCKADDR_DL_STRUCT case AF_LINK: { struct sockaddr_dl *sdlptr; char str[18]; char *etherprint(const u_char *, char *); sdlptr = (struct sockaddr_dl *) &ifr->ifr_addr; printf("%s", ifr->ifr_name); if (sdlptr->sdl_index) printf("\t", sdlptr->sdl_index); if (sdlptr->sdl_type == IFT_ETHER && sdlptr->sdl_alen) printf("\t%s", etherprint((u_char *) LLADDR(sdlptr), str)); putchar('\n'); break; } #endif default: printf("%s\n", ifr->ifr_name); break; } } exit(0); } #ifdef HAVE_SOCKADDR_DL_STRUCT char * etherprint(const u_char eaddr[6], char string[18]) { snprintf(string, 18, "%02x:%02x:%02x:%02x:%02x:%02x", eaddr[0], eaddr[1], eaddr[2], eaddr[3], eaddr[4], eaddr[5] ); string[17] = '\0'; return(string); } #endif