NetBSD/dist/ipf/ipsend/larp.c

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/* $NetBSD: larp.c,v 1.1.1.1 1999/12/11 22:24:10 veego Exp $ */
/*
* larp.c (C) 1995-1998 Darren Reed
*
* Redistribution and use in source and binary forms are permitted
* provided that this notice is preserved and due credit is given
* to the original author and the contributors.
*/
#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 2.1 1999/08/04 17:31:10 darrenr Exp";
#endif
#include <stdio.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <netdb.h>
#include <netinet/in.h>
#include <net/if.h>
#include <net/if_arp.h>
#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;
}