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catopen.c revision 1.10 
      1 /*	$NetBSD: catopen.c,v 1.10 1997/04/22 12:28:01 mrg 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 <limits.h>
     42 #include <stdlib.h>
     43 #include <string.h>
     44 #include <sys/types.h>
     45 #include <sys/param.h>
     46 #include <sys/stat.h>
     47 #include <sys/mman.h>
     48 #include <unistd.h>
     49 #include <fcntl.h>
     50 #include <nl_types.h>
     51 
     52 #define NLS_DEFAULT_PATH "/usr/share/nls/%L/%N.cat:/usr/share/nls/%N/%L"
     53 #define NLS_DEFAULT_LANG "C"
     54 
     55 static nl_catd load_msgcat();
     56 
     57 nl_catd
     58 _catopen(name, oflag)
     59 	const char *name;
     60 	int oflag;
     61 {
     62 	char tmppath[PATH_MAX];
     63 	char *nlspath;
     64 	char *lang;
     65 	char *s, *t;
     66 	const char *u;
     67 	nl_catd catd;
     68 
     69 	if (name == NULL || *name == '\0')
     70 		return (nl_catd)-1;
     71 
     72 	/* absolute or relative path? */
     73 	if (strchr(name, '/'))
     74 		return load_msgcat(name);
     75 
     76 	/*
     77 	 * XXX potential security problem here if this is used in a
     78 	 * set-id program, and NLSPATH or LANG are set to read files
     79 	 * the user normally does not have access to.
     80 	 */
     81 	if ((nlspath = getenv("NLSPATH")) == NULL)
     82 		nlspath = NLS_DEFAULT_PATH;
     83 	if ((lang = getenv("LANG")) == NULL)
     84 		lang = NLS_DEFAULT_LANG;
     85 
     86 	s = nlspath;
     87 	t = tmppath;
     88 	do {
     89 		while (*s && *s != ':') {
     90 			if (*s == '%') {
     91 				switch (*(++s)) {
     92 				case 'L':	/* locale */
     93 					u = lang;
     94 					while (*u && t < tmppath + PATH_MAX)
     95 						*t++ = *u++;
     96 					break;
     97 				case 'N':	/* name */
     98 					u = name;
     99 					while (*u && t < tmppath + PATH_MAX)
    100 						*t++ = *u++;
    101 					break;
    102 				case 'l':	/* lang */
    103 				case 't':	/* territory */
    104 				case 'c':	/* codeset */
    105 					break;
    106 				default:
    107 					if (t < tmppath + PATH_MAX)
    108 						*t++ = *s;
    109 				}
    110 			} else {
    111 				if (t < tmppath + PATH_MAX)
    112 					*t++ = *s;
    113 			}
    114 			s++;
    115 		}
    116 
    117 		*t = '\0';
    118 		catd = load_msgcat(tmppath);
    119 		if (catd != (nl_catd)-1)
    120 			return catd;
    121 
    122 		if (*s)
    123 			s++;
    124 		t = tmppath;
    125 	} while (*s);
    126 
    127 	return (nl_catd)-1;
    128 }
    129 
    130 static nl_catd
    131 load_msgcat(path)
    132 	const char *path;
    133 {
    134 	struct stat st;
    135 	nl_catd catd;
    136 	void *data;
    137 	int fd;
    138 
    139 	if ((fd = open(path, O_RDONLY)) == -1)
    140 		return (nl_catd)-1;
    141 
    142 	if (fstat(fd, &st) != 0) {
    143 		close (fd);
    144 		return (nl_catd)-1;
    145 	}
    146 
    147 	data = mmap(0, (size_t)st.st_size, PROT_READ, MAP_SHARED, fd, 0);
    148 	close (fd);
    149 
    150 	if (data == (void *)-1) {
    151 		munmap(data, (size_t)st.st_size);
    152 		return (nl_catd)-1;
    153 	}
    154 
    155 	if (ntohl(((struct _nls_cat_hdr *)data)->__magic) != _NLS_MAGIC) {
    156 		munmap(data, (size_t)st.st_size);
    157 		return (nl_catd)-1;
    158 	}
    159 
    160 	if ((catd = malloc(sizeof (*catd))) == 0) {
    161 		munmap(data, (size_t)st.st_size);
    162 		return (nl_catd)-1;
    163 	}
    164 
    165 	catd->__data = data;
    166 	catd->__size = st.st_size;
    167 	return catd;
    168 }
    169