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catopen.c revision 1.15 
      1 /*	$NetBSD: catopen.c,v 1.15 1999/08/17 04:00:51 mycroft 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 FOUNDATION OR CONTRIBUTORS
     30  * BE 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 #ifdef __weak_alias
     57 __weak_alias(catopen, _catopen)
     58 #endif
     59 
     60 static nl_catd load_msgcat __P((const char *));
     61 
     62 /* ARGSUSED */
     63 nl_catd
     64 _catopen(name, oflag)
     65 	const char *name;
     66 	int oflag;
     67 {
     68 	char tmppath[PATH_MAX];
     69 	char *nlspath;
     70 	char *lang;
     71 	char *s, *t;
     72 	const char *u;
     73 	nl_catd catd;
     74 
     75 	if (name == NULL || *name == '\0')
     76 		return (nl_catd)-1;
     77 
     78 	/* absolute or relative path? */
     79 	if (strchr(name, '/'))
     80 		return load_msgcat(name);
     81 
     82 	/*
     83 	 * XXX potential security problem here if this is used in a
     84 	 * set-id program, and NLSPATH or LANG are set to read files
     85 	 * the user normally does not have access to.
     86 	 */
     87 	if ((nlspath = getenv("NLSPATH")) == NULL)
     88 		nlspath = NLS_DEFAULT_PATH;
     89 	if ((lang = getenv("LANG")) == NULL)
     90 		lang = NLS_DEFAULT_LANG;
     91 
     92 	s = nlspath;
     93 	t = tmppath;
     94 	do {
     95 		while (*s && *s != ':') {
     96 			if (*s == '%') {
     97 				switch (*(++s)) {
     98 				case 'L':	/* locale */
     99 					u = lang;
    100 					while (*u && t < tmppath + PATH_MAX)
    101 						*t++ = *u++;
    102 					break;
    103 				case 'N':	/* name */
    104 					u = name;
    105 					while (*u && t < tmppath + PATH_MAX)
    106 						*t++ = *u++;
    107 					break;
    108 				case 'l':	/* lang */
    109 				case 't':	/* territory */
    110 				case 'c':	/* codeset */
    111 					break;
    112 				default:
    113 					if (t < tmppath + PATH_MAX)
    114 						*t++ = *s;
    115 				}
    116 			} else {
    117 				if (t < tmppath + PATH_MAX)
    118 					*t++ = *s;
    119 			}
    120 			s++;
    121 		}
    122 
    123 		*t = '\0';
    124 		catd = load_msgcat(tmppath);
    125 		if (catd != (nl_catd)-1)
    126 			return catd;
    127 
    128 		if (*s)
    129 			s++;
    130 		t = tmppath;
    131 	} while (*s);
    132 
    133 	return (nl_catd)-1;
    134 }
    135 
    136 static nl_catd
    137 load_msgcat(path)
    138 	const char *path;
    139 {
    140 	struct stat st;
    141 	nl_catd catd;
    142 	void *data;
    143 	int fd;
    144 
    145 	if ((fd = open(path, O_RDONLY)) == -1)
    146 		return (nl_catd)-1;
    147 
    148 	if (fstat(fd, &st) != 0) {
    149 		close (fd);
    150 		return (nl_catd)-1;
    151 	}
    152 
    153 	data = mmap(0, (size_t)st.st_size, PROT_READ, MAP_FILE|MAP_SHARED, fd,
    154 	    (off_t)0);
    155 	close (fd);
    156 
    157 	if (data == (void *)-1) {
    158 		munmap(data, (size_t)st.st_size);
    159 		return (nl_catd)-1;
    160 	}
    161 
    162 	if (ntohl((u_int32_t)((struct _nls_cat_hdr *)data)->__magic) !=
    163 	    _NLS_MAGIC) {
    164 		munmap(data, (size_t)st.st_size);
    165 		return (nl_catd)-1;
    166 	}
    167 
    168 	if ((catd = malloc(sizeof (*catd))) == 0) {
    169 		munmap(data, (size_t)st.st_size);
    170 		return (nl_catd)-1;
    171 	}
    172 
    173 	catd->__data = data;
    174 	catd->__size = (int)st.st_size;
    175 	return catd;
    176 }
    177