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catopen.c revision 1.11 
      1 /*	$NetBSD: catopen.c,v 1.11 1997/07/13 19:58:37 christos Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1996 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by J.T. Conklin.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *        This product includes software developed by the NetBSD
     21  *        Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
     30  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 #define _NLS_PRIVATE
     40 
     41 #include "namespace.h"
     42 #include <limits.h>
     43 #include <stdlib.h>
     44 #include <string.h>
     45 #include <sys/types.h>
     46 #include <sys/param.h>
     47 #include <sys/stat.h>
     48 #include <sys/mman.h>
     49 #include <unistd.h>
     50 #include <fcntl.h>
     51 #include <nl_types.h>
     52 
     53 #define NLS_DEFAULT_PATH "/usr/share/nls/%L/%N.cat:/usr/share/nls/%N/%L"
     54 #define NLS_DEFAULT_LANG "C"
     55 
     56 static nl_catd load_msgcat __P((const char *));
     57 
     58 nl_catd
     59 _catopen(name, oflag)
     60 	const char *name;
     61 	int oflag;
     62 {
     63 	char tmppath[PATH_MAX];
     64 	char *nlspath;
     65 	char *lang;
     66 	char *s, *t;
     67 	const char *u;
     68 	nl_catd catd;
     69 
     70 	if (name == NULL || *name == '\0')
     71 		return (nl_catd)-1;
     72 
     73 	/* absolute or relative path? */
     74 	if (strchr(name, '/'))
     75 		return load_msgcat(name);
     76 
     77 	/*
     78 	 * XXX potential security problem here if this is used in a
     79 	 * set-id program, and NLSPATH or LANG are set to read files
     80 	 * the user normally does not have access to.
     81 	 */
     82 	if ((nlspath = getenv("NLSPATH")) == NULL)
     83 		nlspath = NLS_DEFAULT_PATH;
     84 	if ((lang = getenv("LANG")) == NULL)
     85 		lang = NLS_DEFAULT_LANG;
     86 
     87 	s = nlspath;
     88 	t = tmppath;
     89 	do {
     90 		while (*s && *s != ':') {
     91 			if (*s == '%') {
     92 				switch (*(++s)) {
     93 				case 'L':	/* locale */
     94 					u = lang;
     95 					while (*u && t < tmppath + PATH_MAX)
     96 						*t++ = *u++;
     97 					break;
     98 				case 'N':	/* name */
     99 					u = name;
    100 					while (*u && t < tmppath + PATH_MAX)
    101 						*t++ = *u++;
    102 					break;
    103 				case 'l':	/* lang */
    104 				case 't':	/* territory */
    105 				case 'c':	/* codeset */
    106 					break;
    107 				default:
    108 					if (t < tmppath + PATH_MAX)
    109 						*t++ = *s;
    110 				}
    111 			} else {
    112 				if (t < tmppath + PATH_MAX)
    113 					*t++ = *s;
    114 			}
    115 			s++;
    116 		}
    117 
    118 		*t = '\0';
    119 		catd = load_msgcat(tmppath);
    120 		if (catd != (nl_catd)-1)
    121 			return catd;
    122 
    123 		if (*s)
    124 			s++;
    125 		t = tmppath;
    126 	} while (*s);
    127 
    128 	return (nl_catd)-1;
    129 }
    130 
    131 static nl_catd
    132 load_msgcat(path)
    133 	const char *path;
    134 {
    135 	struct stat st;
    136 	nl_catd catd;
    137 	void *data;
    138 	int fd;
    139 
    140 	if ((fd = open(path, O_RDONLY)) == -1)
    141 		return (nl_catd)-1;
    142 
    143 	if (fstat(fd, &st) != 0) {
    144 		close (fd);
    145 		return (nl_catd)-1;
    146 	}
    147 
    148 	data = mmap(0, (size_t)st.st_size, PROT_READ, MAP_SHARED, fd, 0);
    149 	close (fd);
    150 
    151 	if (data == (void *)-1) {
    152 		munmap(data, (size_t)st.st_size);
    153 		return (nl_catd)-1;
    154 	}
    155 
    156 	if (ntohl(((struct _nls_cat_hdr *)data)->__magic) != _NLS_MAGIC) {
    157 		munmap(data, (size_t)st.st_size);
    158 		return (nl_catd)-1;
    159 	}
    160 
    161 	if ((catd = malloc(sizeof (*catd))) == 0) {
    162 		munmap(data, (size_t)st.st_size);
    163 		return (nl_catd)-1;
    164 	}
    165 
    166 	catd->__data = data;
    167 	catd->__size = st.st_size;
    168 	return catd;
    169 }
    170