94 lines
1.9 KiB
C
94 lines
1.9 KiB
C
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/* $NetBSD: larp.c,v 1.1.1.1 1999/12/11 22:24:10 veego Exp $ */
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/*
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* larp.c (C) 1995-1998 Darren Reed
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that this notice is preserved and due credit is given
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* to the original author and the contributors.
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*/
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#if !defined(lint)
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static const char sccsid[] = "@(#)larp.c 1.1 8/19/95 (C)1995 Darren Reed";
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static const char rcsid[] = "@(#)Id: larp.c,v 2.1 1999/08/04 17:31:10 darrenr Exp";
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#endif
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#include <stdio.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/ioctl.h>
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#include <netdb.h>
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#include <netinet/in.h>
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#include <net/if.h>
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#include <net/if_arp.h>
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#include "ip_compat.h"
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#include "iplang/iplang.h"
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/*
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* lookup host and return
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* its IP address in address
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* (4 bytes)
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*/
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int resolve(host, address)
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char *host, *address;
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{
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struct hostent *hp;
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u_long add;
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add = inet_addr(host);
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if (add == -1)
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{
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if (!(hp = gethostbyname(host)))
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{
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fprintf(stderr, "unknown host: %s\n", host);
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return -1;
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}
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bcopy((char *)hp->h_addr, (char *)address, 4);
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return 0;
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}
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bcopy((char*)&add, address, 4);
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return 0;
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}
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/*
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* ARP for the MAC address corresponding
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* to the IP address. This taken from
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* some BSD program, I cant remember which.
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*/
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int arp(ip, ether)
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char *ip;
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char *ether;
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{
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static int s = -1;
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struct arpreq ar;
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struct sockaddr_in *sin;
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char *inet_ntoa();
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#ifdef IP_SEND
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if (arp_getipv4(ip, ether) == 0)
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return 0;
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#endif
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bzero((char *)&ar, sizeof(ar));
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sin = (struct sockaddr_in *)&ar.arp_pa;
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sin->sin_family = AF_INET;
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bcopy(ip, (char *)&sin->sin_addr.s_addr, 4);
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if (s == -1)
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if ((s = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
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{
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perror("arp: socket");
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return -1;
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}
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if (ioctl(s, SIOCGARP, (caddr_t)&ar) == -1)
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{
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fprintf(stderr, "(%s):", inet_ntoa(sin->sin_addr));
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if (errno != ENXIO)
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perror("SIOCGARP");
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return -1;
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}
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bcopy(ar.arp_ha.sa_data, ether, 6);
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return 0;
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}
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