usr.bin/ypcat/ypalias_init.c

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Copyright (c) 2009 The NetBSD Foundation
   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  * 3. The name of the author may not be used to endorse or promote
  16  *    products derived from this software without specific prior written
  17  *    permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
  20  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  21  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
  23  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 /* Code contributed by Greywolf <greywolf@starwolf.com>
  33  * 28 August 2003.  All rights released to The NetBSD Foundation.
  34  */
  35
  36 #include <sys/cdefs.h>
  37 #ifndef lint
  38 __RCSID("$NetBSD$");
  39 #endif
  40
  41 #include <err.h>
  42 #include <stdio.h>
  43 #include <stdlib.h>
  44 #include <string.h>
  45 #include <unistd.h>
  46 #include <paths.h>
  47 #include <errno.h>
  48
  49 #include "ypalias_init.h"
  50
  51 #ifndef _PATH_YPNICKNAMES
  52 #define _PATH_YPNICKNAMES   "/var/yp/nicknames"
  53 #endif
  54
  55 const struct ypalias def_ypaliases[] = {
  56         { "passwd", "passwd.byname" },
  57         { "group", "group.byname" },
  58         { "networks", "networks.byaddr" },
  59         { "hosts", "hosts.byaddr" },
  60         { "protocols", "protocols.bynumber" },
  61         { "services", "services.byname" },
  62         { "aliases", "mail.aliases" },
  63         { "ethers", "ethers.byname" },
  64         { NULL, NULL },
  65 };
  66
  67 const struct ypalias *
  68 ypalias_init(void)
  69 {
  70         FILE *fp;
  71         char *cp, *line;
  72         struct ypalias *ypa, *nypa;
  73         size_t nypalias = 50;
  74         size_t i, len, lineno;
  75
  76         if ((fp = fopen(_PATH_YPNICKNAMES, "r")) == NULL)
  77                 return &def_ypaliases[0];
  78
  79         if ((ypa = calloc(sizeof(*ypa), nypalias)) == NULL)
  80                 goto out;
  81
  82         lineno = 1;
  83         for (i = 0; (line = fparseln(fp, &len, &lineno, NULL,
  84             FPARSELN_UNESCALL));) {
  85                 cp = line;
  86                 /* Ignore malformed lines */
  87                 if ((ypa[i].alias = strsep(&line, " \t\n")) == NULL ||
  88                     (ypa[i].name = strsep(&line, " \t\n")) == NULL ||
  89                     ypa[i].alias != cp) {
  90                         warnx("%s, %zu: syntax error, ignored",
  91                             _PATH_YPNICKNAMES, lineno);
  92                         free(cp);
  93                 } else
  94                         i++;
  95                 if (i == nypalias) {
  96                         nypalias <<= 1;
  97                         nypa = realloc(ypa, sizeof(*ypa) * nypalias);
  98                         if (nypa == NULL)
  99                                 goto out;
 100                         ypa = nypa;
 101                 }
 102         }
 103         ypa[i].alias = ypa[i].name = NULL;
 104         i++;
 105
 106         (void)fclose(fp);
 107         if ((nypa = realloc(ypa, sizeof(*ypa) * i)) != NULL)
 108                 return nypa;
 109 out:
 110         warn("Cannot alllocate alias space, returning default list");
 111         if (ypa) {
 112                 do
 113                         free(__UNCONST(ypa[--i].alias));
 114                 while (i != 0);
 115                 free(ypa);
 116         }
 117         (void)fclose(fp);
 118         return def_ypaliases;
 119         return ypa;
 120 }