usr.sbin/bootp/common/trygetif.c

   1 /*      $NetBSD: trygetif.c,v 1.5 2002/07/14 00:26:18 wiz Exp $ */
   2
   3 #include <sys/cdefs.h>
   4 #ifndef lint
   5 __RCSID("$NetBSD: trygetif.c,v 1.5 2002/07/14 00:26:18 wiz Exp $");
   6 #endif
   7
   8 /*
   9  * trygetif.c - test program for getif.c
  10  */
  11
  12 #include <sys/types.h>
  13 #include <sys/socket.h>
  14
  15 #if defined(SUNOS) || defined(SVR4)
  16 #include <sys/sockio.h>
  17 #endif
  18
  19 #include <net/if.h>                             /* for struct ifreq */
  20 #include <netinet/in.h>
  21 #include <arpa/inet.h>                  /* inet_ntoa */
  22
  23 #include <netdb.h>
  24 #include <stdio.h>
  25 #include <errno.h>
  26
  27 #include "getif.h"
  28
  29 int
  30 main(int argc, char **argv)
  31 {
  32         struct hostent *hep;
  33         struct sockaddr ea;                     /* Ethernet address */
  34         struct sockaddr_in *sip;        /* Interface address */
  35         struct ifreq *ifr;
  36         struct in_addr dst_addr;
  37         struct in_addr *dap;
  38         int i, s;
  39
  40         dap = NULL;
  41         if (argc > 1) {
  42                 dap = &dst_addr;
  43                 if (inet_aton(argv[1], &dst_addr) == 0) {
  44                         hep = gethostbyname(argv[1]);
  45                         if (!hep) {
  46                                 fprintf(stderr, "gethostbyname(%s)\n", argv[1]);
  47                                 exit(1);
  48                         }
  49                         memcpy(&dst_addr, hep->h_addr, sizeof(dst_addr));
  50                 }
  51         }
  52         s = socket(AF_INET, SOCK_DGRAM, 0);
  53         if (s < 0) {
  54                 perror("socket open");
  55                 exit(1);
  56         }
  57         ifr = getif(s, dap);
  58         if (!ifr) {
  59                 fprintf(stderr, "no interface for address\n");
  60                 exit(1);
  61         }
  62         printf("Intf-name:%s\n", ifr->ifr_name);
  63         sip = (struct sockaddr_in *) &(ifr->ifr_addr);
  64         printf("Intf-addr:%s\n", inet_ntoa(sip->sin_addr));
  65
  66         return 0;
  67 }