dist/ipf/ipsend/44arp.c

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Based upon 4.4BSD's /usr/sbin/arp
   5  */
   6 #include <sys/param.h>
   7 #include <sys/file.h>
   8 #include <sys/socket.h>
   9 #include <sys/sysctl.h>
  10 #include <net/if.h>
  11 #if __FreeBSD_version >= 300000
  12 # include <net/if_var.h>
  13 #endif
  14 #include <net/if_dl.h>
  15 #include <net/if_types.h>
  16 #if defined(__FreeBSD__)
  17 # include "radix_ipf.h"
  18 #endif
  19 #ifndef __osf__
  20 # include <net/route.h>
  21 #endif
  22 #include <netinet/in.h>
  23 #include <netinet/if_ether.h>
  24 #include <arpa/inet.h>
  25 #include <netinet/in.h>
  26 #include <netinet/in_systm.h>
  27 #include <netinet/ip.h>
  28 #include <netinet/ip_var.h>
  29 #include <netinet/tcp.h>
  30 #include <unistd.h>
  31 #include <string.h>
  32 #include <stdlib.h>
  33 #include <netdb.h>
  34 #include <errno.h>
  35 #include <nlist.h>
  36 #include <stdio.h>
  37 #include "ipsend.h"
  38 #include "iplang/iplang.h"
  39
  40
  41 /*
  42  * lookup host and return
  43  * its IP address in address
  44  * (4 bytes)
  45  */
  46 int     resolve(host, address)
  47 char    *host, *address;
  48 {
  49         struct  hostent *hp;
  50         u_long  add;
  51
  52         add = inet_addr(host);
  53         if (add == -1)
  54             {
  55                 if (!(hp = gethostbyname(host)))
  56                     {
  57                         fprintf(stderr, "unknown host: %s\n", host);
  58                         return -1;
  59                     }
  60                 bcopy((char *)hp->h_addr, (char *)address, 4);
  61                 return 0;
  62         }
  63         bcopy((char*)&add, address, 4);
  64         return 0;
  65 }
  66
  67
  68 int     arp(addr, eaddr)
  69 char    *addr, *eaddr;
  70 {
  71         int     mib[6];
  72         size_t  needed;
  73         char    *lim, *buf, *next;
  74         struct  rt_msghdr       *rtm;
  75         struct  sockaddr_inarp  *sin;
  76         struct  sockaddr_dl     *sdl;
  77
  78 #ifdef  IPSEND
  79         if (arp_getipv4(addr, ether) == 0)
  80                 return 0;
  81 #endif
  82
  83         if (!addr)
  84                 return -1;
  85
  86         mib[0] = CTL_NET;
  87         mib[1] = PF_ROUTE;
  88         mib[2] = 0;
  89         mib[3] = AF_INET;
  90         mib[4] = NET_RT_FLAGS;
  91         mib[5] = RTF_LLINFO;
  92         if (sysctl(mib, 6, NULL, &needed, NULL, 0) == -1)
  93             {
  94                 perror("route-sysctl-estimate");
  95                 exit(-1);
  96             }
  97         if ((buf = malloc(needed)) == NULL)
  98             {
  99                 perror("malloc");
 100                 exit(-1);
 101             }
 102         if (sysctl(mib, 6, buf, &needed, NULL, 0) == -1)
 103             {
 104                 perror("actual retrieval of routing table");
 105                 exit(-1);
 106             }
 107         lim = buf + needed;
 108         for (next = buf; next < lim; next += rtm->rtm_msglen)
 109             {
 110                 rtm = (struct rt_msghdr *)next;
 111                 sin = (struct sockaddr_inarp *)(rtm + 1);
 112                 sdl = (struct sockaddr_dl *)(sin + 1);
 113                 if (!bcmp(addr, (char *)&sin->sin_addr,
 114                           sizeof(struct in_addr)))
 115                     {
 116                         bcopy(LLADDR(sdl), eaddr, sdl->sdl_alen);
 117                         return 0;
 118                     }
 119             }
 120         return -1;
 121 }