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nsdispatch.c revision 1.9 
      1 /*	$NetBSD: nsdispatch.c,v 1.9 1999/01/25 00:16:17 lukem Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1997, 1998, 1999 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Luke Mewburn.
      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 #include <sys/cdefs.h>
     40 #if defined(LIBC_SCCS) && !defined(lint)
     41 __RCSID("$NetBSD: nsdispatch.c,v 1.9 1999/01/25 00:16:17 lukem Exp $");
     42 #endif /* LIBC_SCCS and not lint */
     43 
     44 #include "namespace.h"
     45 
     46 #include <sys/types.h>
     47 #include <sys/param.h>
     48 #include <sys/stat.h>
     49 
     50 #include <err.h>
     51 #include <fcntl.h>
     52 #define _NS_PRIVATE
     53 #include <nsswitch.h>
     54 #include <stdio.h>
     55 #include <stdlib.h>
     56 #include <string.h>
     57 #include <unistd.h>
     58 
     59 #ifdef __weak_alias
     60 __weak_alias(nsdispatch,_nsdispatch);
     61 #endif
     62 
     63 
     64 /*
     65  * default sourcelist: `files'
     66  */
     67 const ns_src __nsdefaultsrc[] = {
     68 	{ NSSRC_FILES, NS_SUCCESS },
     69 	{ 0 },
     70 };
     71 
     72 
     73 static	int			 _nsmapsize = 0;
     74 static	ns_dbt			*_nsmap = NULL;
     75 
     76 /*
     77  * size of dynamic array chunk for _nsmap and _nsmap[x].srclist
     78  */
     79 #define NSELEMSPERCHUNK		8
     80 
     81 
     82 int	_nscmp __P((const void *, const void *));
     83 
     84 
     85 int
     86 _nscmp(a, b)
     87 	const void *a;
     88 	const void *b;
     89 {
     90 	return (strcasecmp(((const ns_dbt *)a)->name,
     91 	    ((const ns_dbt *)b)->name));
     92 }
     93 
     94 
     95 void
     96 _nsdbtaddsrc(dbt, src)
     97 	ns_dbt		*dbt;
     98 	const ns_src	*src;
     99 {
    100 	if ((dbt->srclistsize % NSELEMSPERCHUNK) == 0) {
    101 		dbt->srclist = (ns_src *)realloc(dbt->srclist,
    102 		    (dbt->srclistsize + NSELEMSPERCHUNK) * sizeof(ns_src));
    103 		if (dbt->srclist == NULL)
    104 			err(1, "nsdispatch: memory allocation failure");
    105 	}
    106 	memmove(&dbt->srclist[dbt->srclistsize++], src, sizeof(ns_src));
    107 }
    108 
    109 
    110 void
    111 _nsdbtdump(dbt)
    112 	const ns_dbt *dbt;
    113 {
    114 	int i;
    115 
    116 	printf("%s (%d source%s):", dbt->name, dbt->srclistsize,
    117 	    dbt->srclistsize == 1 ? "" : "s");
    118 	for (i = 0; i < dbt->srclistsize; i++) {
    119 		printf(" %s", dbt->srclist[i].name);
    120 		if (!(dbt->srclist[i].flags &
    121 		    (NS_UNAVAIL|NS_NOTFOUND|NS_TRYAGAIN)) &&
    122 		    (dbt->srclist[i].flags & NS_SUCCESS))
    123 			continue;
    124 		printf(" [");
    125 		if (!(dbt->srclist[i].flags & NS_SUCCESS))
    126 			printf(" SUCCESS=continue");
    127 		if (dbt->srclist[i].flags & NS_UNAVAIL)
    128 			printf(" UNAVAIL=return");
    129 		if (dbt->srclist[i].flags & NS_NOTFOUND)
    130 			printf(" NOTFOUND=return");
    131 		if (dbt->srclist[i].flags & NS_TRYAGAIN)
    132 			printf(" TRYAGAIN=return");
    133 		printf(" ]");
    134 	}
    135 	printf("\n");
    136 }
    137 
    138 
    139 const ns_dbt *
    140 _nsdbtget(name)
    141 	const char	*name;
    142 {
    143 	static	time_t	 confmod;
    144 
    145 	struct stat	 statbuf;
    146 	ns_dbt		 dbt;
    147 
    148 	extern	FILE 	*_nsyyin;
    149 	extern	int	 _nsyyparse __P((void));
    150 
    151 	dbt.name = name;
    152 
    153 	if (confmod) {
    154 		if (stat(_PATH_NS_CONF, &statbuf) == -1)
    155 			return (NULL);
    156 		if (confmod < statbuf.st_mtime) {
    157 			int i, j;
    158 
    159 			for (i = 0; i < _nsmapsize; i++) {
    160 				for (j = 0; j < _nsmap[i].srclistsize; j++) {
    161 					if (_nsmap[i].srclist[j].name != NULL) {
    162 						/*LINTED const cast*/
    163 						free((void *)
    164 						    _nsmap[i].srclist[j].name);
    165 					}
    166 				}
    167 				if (_nsmap[i].srclist)
    168 					free(_nsmap[i].srclist);
    169 				if (_nsmap[i].name) {
    170 					/*LINTED const cast*/
    171 					free((void *)_nsmap[i].name);
    172 				}
    173 			}
    174 			if (_nsmap)
    175 				free(_nsmap);
    176 			_nsmap = NULL;
    177 			_nsmapsize = 0;
    178 			confmod = 0;
    179 		}
    180 	}
    181 	if (!confmod) {
    182 		if (stat(_PATH_NS_CONF, &statbuf) == -1)
    183 			return (NULL);
    184 		_nsyyin = fopen(_PATH_NS_CONF, "r");
    185 		if (_nsyyin == NULL)
    186 			return (NULL);
    187 		_nsyyparse();
    188 		(void)fclose(_nsyyin);
    189 		qsort(_nsmap, (size_t)_nsmapsize, sizeof(ns_dbt), _nscmp);
    190 		confmod = statbuf.st_mtime;
    191 	}
    192 	return (bsearch(&dbt, _nsmap, (size_t)_nsmapsize, sizeof(ns_dbt),
    193 	    _nscmp));
    194 }
    195 
    196 
    197 void
    198 _nsdbtput(dbt)
    199 	const ns_dbt *dbt;
    200 {
    201 	int	i;
    202 
    203 	for (i = 0; i < _nsmapsize; i++) {
    204 		if (_nscmp(dbt, &_nsmap[i]) == 0) {
    205 					/* overwrite existing entry */
    206 			if (_nsmap[i].srclist != NULL)
    207 				free(_nsmap[i].srclist);
    208 			memmove(&_nsmap[i], dbt, sizeof(ns_dbt));
    209 			return;
    210 		}
    211 	}
    212 
    213 	if ((_nsmapsize % NSELEMSPERCHUNK) == 0) {
    214 		_nsmap = (ns_dbt *)realloc(_nsmap,
    215 		    (_nsmapsize + NSELEMSPERCHUNK) * sizeof(ns_dbt));
    216 		if (_nsmap == NULL)
    217 			err(1, "nsdispatch: memory allocation failure");
    218 	}
    219 	memmove(&_nsmap[_nsmapsize++], dbt, sizeof(ns_dbt));
    220 }
    221 
    222 
    223 int
    224 #if __STDC__
    225 nsdispatch(void *retval, const ns_dtab disp_tab[], const char *database,
    226 	    const char *method, const ns_src defaults[], ...)
    227 #else
    228 nsdispatch(retval, disp_tab, database, method, defaults, va_alist)
    229 	void		*retval;
    230 	const ns_dtab	 disp_tab[];
    231 	const char	*database;
    232 	const char	*method;
    233 	const ns_src	 defaults[];
    234 	va_dcl
    235 #endif
    236 {
    237 	va_list		 ap;
    238 	int		 i, curdisp, result;
    239 	const ns_dbt	*dbt;
    240 	const ns_src	*srclist;
    241 	int		 srclistsize;
    242 
    243 	dbt = _nsdbtget(database);
    244 	if (dbt != NULL) {
    245 		srclist = dbt->srclist;
    246 		srclistsize = dbt->srclistsize;
    247 	} else {
    248 		srclist = defaults;
    249 		srclistsize = 0;
    250 		while (srclist[srclistsize].name != NULL)
    251 			srclistsize++;
    252 	}
    253 	result = 0;
    254 
    255 	for (i = 0; i < srclistsize; i++) {
    256 		for (curdisp = 0; disp_tab[curdisp].src != NULL; curdisp++)
    257 			if (strcasecmp(disp_tab[curdisp].src,
    258 			    srclist[i].name) == 0)
    259 				break;
    260 		result = 0;
    261 		if (disp_tab[curdisp].callback) {
    262 #if __STDC__
    263 			va_start(ap, defaults);
    264 #else
    265 			va_start(ap);
    266 #endif
    267 			result = disp_tab[curdisp].callback(retval,
    268 			    disp_tab[curdisp].cb_data, ap);
    269 			va_end(ap);
    270 			if (result & srclist[i].flags) {
    271 				break;
    272 			}
    273 		}
    274 	}
    275 	return (result ? result : NS_NOTFOUND);
    276 }
    277