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      1 /*	$NetBSD: ypalias_init.c,v 1.3 2024/06/02 11:44:29 andvar Exp $	*/
      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 (at) 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: ypalias_init.c,v 1.3 2024/06/02 11:44:29 andvar Exp $");
     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;
     73 	size_t nypalias = 50;
     74 	size_t i = 0, 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 (; (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 			if (reallocarr(&ypa, nypalias, sizeof(*ypa)) != 0)
     98 				goto out;
     99 		}
    100 	}
    101 	ypa[i].alias = ypa[i].name = NULL;
    102 	i++;
    103 
    104 	(void)fclose(fp);
    105 	if (reallocarr(&ypa, i, sizeof(*ypa)) == 0)
    106 		return ypa;
    107 out:
    108 	warn("Cannot allocate alias space, returning default list");
    109 	if (ypa) {
    110 		do
    111 			free(__UNCONST(ypa[--i].alias));
    112 		while (i != 0);
    113 		free(ypa);
    114 	}
    115 	(void)fclose(fp);
    116 	return def_ypaliases;
    117 }
    118