/* $NetBSD: larp.c,v 1.2 2012/07/22 14:27:36 darrenr Exp $ */ /* * larp.c (C) 1995-1998 Darren Reed * * See the IPFILTER.LICENCE file for details on licencing. * */ #if !defined(lint) static const char sccsid[] = "@(#)larp.c 1.1 8/19/95 (C)1995 Darren Reed"; static const char rcsid[] = "@(#)Id: larp.c,v 1.1.1.2 2012/07/22 13:44:37 darrenr Exp $"; #endif #include #include #include #include #include #include #include #include #include #include #include "ip_compat.h" #include "iplang/iplang.h" /* * lookup host and return * its IP address in address * (4 bytes) */ int resolve(host, address) char *host, *address; { struct hostent *hp; u_long add; add = inet_addr(host); if (add == -1) { if (!(hp = gethostbyname(host))) { fprintf(stderr, "unknown host: %s\n", host); return -1; } bcopy((char *)hp->h_addr, (char *)address, 4); return 0; } bcopy((char*)&add, address, 4); return 0; } /* * ARP for the MAC address corresponding * to the IP address. This taken from * some BSD program, I cant remember which. */ int arp(ip, ether) char *ip; char *ether; { static int s = -1; struct arpreq ar; struct sockaddr_in *sin; char *inet_ntoa(); #ifdef IP_SEND if (arp_getipv4(ip, ether) == 0) return 0; #endif bzero((char *)&ar, sizeof(ar)); sin = (struct sockaddr_in *)&ar.arp_pa; sin->sin_family = AF_INET; bcopy(ip, (char *)&sin->sin_addr.s_addr, 4); if (s == -1) if ((s = socket(AF_INET, SOCK_DGRAM, 0)) == -1) { perror("arp: socket"); return -1; } if (ioctl(s, SIOCGARP, (caddr_t)&ar) == -1) { fprintf(stderr, "(%s):", inet_ntoa(sin->sin_addr)); if (errno != ENXIO) perror("SIOCGARP"); return -1; } bcopy(ar.arp_ha.sa_data, ether, 6); return 0; }