dist/ipf/ipsend/larp.c

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * larp.c (C) 1995-1998 Darren Reed
   5  *
   6  * See the IPFILTER.LICENCE file for details on licencing.
   7  *
   8  */
   9 #if !defined(lint)
  10 static const char sccsid[] = "@(#)larp.c        1.1 8/19/95 (C)1995 Darren Reed";
  11 static const char rcsid[] = "@(#)Id: larp.c,v 2.4 2003/12/01 02:01:16 darrenr Exp";
  12 #endif
  13 #include <sys/param.h>
  14 #include <sys/types.h>
  15 #include <sys/socket.h>
  16 #include <sys/ioctl.h>
  17 #include <netinet/in.h>
  18 #include <net/if.h>
  19 #include <net/if_arp.h>
  20 #include <stdio.h>
  21 #include <netdb.h>
  22 #include <errno.h>
  23
  24 #include "ip_compat.h"
  25 #include "iplang/iplang.h"
  26
  27 /*
  28  * lookup host and return
  29  * its IP address in address
  30  * (4 bytes)
  31  */
  32 int     resolve(host, address)
  33 char    *host, *address;
  34 {
  35         struct  hostent *hp;
  36         u_long  add;
  37
  38         add = inet_addr(host);
  39         if (add == -1)
  40             {
  41                 if (!(hp = gethostbyname(host)))
  42                     {
  43                         fprintf(stderr, "unknown host: %s\n", host);
  44                         return -1;
  45                     }
  46                 bcopy((char *)hp->h_addr, (char *)address, 4);
  47                 return 0;
  48         }
  49         bcopy((char*)&add, address, 4);
  50         return 0;
  51 }
  52
  53 /*
  54  * ARP for the MAC address corresponding
  55  * to the IP address.  This taken from
  56  * some BSD program, I cant remember which.
  57  */
  58 int     arp(ip, ether)
  59 char    *ip;
  60 char    *ether;
  61 {
  62         static  int     s = -1;
  63         struct  arpreq  ar;
  64         struct  sockaddr_in     *sin;
  65         char    *inet_ntoa();
  66
  67 #ifdef  IP_SEND
  68         if (arp_getipv4(ip, ether) == 0)
  69                 return 0;
  70 #endif
  71         bzero((char *)&ar, sizeof(ar));
  72         sin = (struct sockaddr_in *)&ar.arp_pa;
  73         sin->sin_family = AF_INET;
  74         bcopy(ip, (char *)&sin->sin_addr.s_addr, 4);
  75
  76         if (s == -1)
  77                 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
  78                     {
  79                         perror("arp: socket");
  80                         return -1;
  81                     }
  82
  83         if (ioctl(s, SIOCGARP, (caddr_t)&ar) == -1)
  84             {
  85                 fprintf(stderr, "(%s):", inet_ntoa(sin->sin_addr));
  86                 if (errno != ENXIO)
  87                         perror("SIOCGARP");
  88                 return -1;
  89             }
  90
  91         bcopy(ar.arp_ha.sa_data, ether, 6);
  92         return 0;
  93 }