usr.sbin/ypserv/stdhosts/stdhosts.c

   1 /*      $NetBSD: stdhosts.c,v 1.18 2009/04/19 06:06:40 lukem Exp $       */
   2
   3 /*
   4  * Copyright (c) 1994 Mats O Jansson <moj@stacken.kth.se>
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
  17  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  18  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
  20  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  */
  28
  29 #include <sys/cdefs.h>
  30 #ifndef lint
  31 __RCSID("$NetBSD: stdhosts.c,v 1.18 2009/04/19 06:06:40 lukem Exp $");
  32 #endif
  33
  34 #include <sys/types.h>
  35 #include <sys/socket.h>
  36 #include <netinet/in.h>
  37 #include <arpa/inet.h>
  38 #include <ctype.h>
  39 #include <err.h>
  40 #include <limits.h>
  41 #include <stdio.h>
  42 #include <stdlib.h>
  43 #include <string.h>
  44 #include <unistd.h>
  45 #include <netdb.h>
  46
  47 #include "protos.h"
  48
  49 int     main(int, char *[]);
  50 void    usage(void);
  51
  52 int
  53 main(int argc, char *argv[])
  54 {
  55         struct in_addr host_addr;
  56         FILE    *data_file;
  57         size_t   line_no;
  58         size_t   len;
  59         char    *line, *k, *v, *addr_string;
  60         const char *fname;
  61         int      ch;
  62         int      af = 1 << 4;   /*IPv4*/
  63         struct addrinfo hints, *res;
  64
  65         addr_string = NULL;             /* XXX gcc -Wuninitialized */
  66
  67         while ((ch = getopt(argc, argv, "n")) != -1) {
  68                 switch (ch) {
  69                 case 'n':
  70                         af |= 1 << 6;   /*IPv6*/
  71                         break;
  72                 default:
  73                         usage();
  74                         /* NOTREACHED */
  75                 }
  76         }
  77         argc -= optind;
  78         argv += optind;
  79
  80         if (argc > 1)
  81                 usage();
  82
  83         if (argc == 1) {
  84                 fname = argv[0];
  85                 data_file = fopen(fname, "r");
  86                 if (data_file == NULL)
  87                         err(1, "%s", fname);
  88         } else {
  89                 fname = "<stdin>";
  90                 data_file = stdin;
  91         }
  92
  93         line_no = 0;
  94         for (;
  95             (line = fparseln(data_file, &len, &line_no, NULL,
  96                 FPARSELN_UNESCALL));
  97             free(line)) {
  98                 if (len == 0)
  99                         continue;
 100
 101                 v = line;
 102                 for (k = v; *v && !isspace((unsigned char)*v); v++)
 103                         ;
 104                 while (*v && isspace((unsigned char)*v))
 105                         *v++ = '\0';
 106
 107                 memset(&hints, 0, sizeof(hints));
 108                 hints.ai_socktype = SOCK_DGRAM;         /*dummy*/
 109                 hints.ai_flags = AI_NUMERICHOST;
 110
 111                 if ((af & (1 << 4)) != 0 && inet_aton(k, &host_addr) == 1 &&
 112                     (addr_string = inet_ntoa(host_addr)) != NULL) {
 113                         /* IPv4 */
 114                         printf("%s %s\n", addr_string, v);
 115                 } else if ((af & (1 << 6)) != 0 &&
 116                            getaddrinfo(k, "0", &hints, &res) == 0) {
 117                         /* IPv6, with scope extension permitted */
 118                         freeaddrinfo(res);
 119                         printf("%s %s\n", k, v);
 120                 } else
 121                         warnx("%s line %lu: syntax error", fname,
 122                             (unsigned long)line_no);
 123         }
 124
 125         exit(0);
 126 }
 127
 128 void
 129 usage(void)
 130 {
 131
 132         fprintf(stderr, "usage: %s [-n] [file]\n", getprogname());
 133         exit(1);
 134 }