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nsdispatch.c revision 1.10 
      1 /*	$NetBSD: nsdispatch.c,v 1.10 1999/04/18 02:27:54 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 1.10 1999/04/18 02:27:54 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 __STDC__
     60 #include <stdarg.h>
     61 #else
     62 #include <varargs.h>
     63 #endif
     64 
     65 #ifdef __weak_alias
     66 __weak_alias(nsdispatch,_nsdispatch);
     67 #endif
     68 
     69 
     70 /*
     71  * default sourcelist: `files'
     72  */
     73 const ns_src __nsdefaultsrc[] = {
     74 	{ NSSRC_FILES, NS_SUCCESS },
     75 	{ 0 },
     76 };
     77 
     78 
     79 static	int			 _nsmapsize = 0;
     80 static	ns_dbt			*_nsmap = NULL;
     81 
     82 /*
     83  * size of dynamic array chunk for _nsmap and _nsmap[x].srclist
     84  */
     85 #define NSELEMSPERCHUNK		8
     86 
     87 
     88 int	_nscmp __P((const void *, const void *));
     89 
     90 
     91 int
     92 _nscmp(a, b)
     93 	const void *a;
     94 	const void *b;
     95 {
     96 	return (strcasecmp(((const ns_dbt *)a)->name,
     97 	    ((const ns_dbt *)b)->name));
     98 }
     99 
    100 
    101 void
    102 _nsdbtaddsrc(dbt, src)
    103 	ns_dbt		*dbt;
    104 	const ns_src	*src;
    105 {
    106 	if ((dbt->srclistsize % NSELEMSPERCHUNK) == 0) {
    107 		dbt->srclist = (ns_src *)realloc(dbt->srclist,
    108 		    (dbt->srclistsize + NSELEMSPERCHUNK) * sizeof(ns_src));
    109 		if (dbt->srclist == NULL)
    110 			err(1, "nsdispatch: memory allocation failure");
    111 	}
    112 	memmove(&dbt->srclist[dbt->srclistsize++], src, sizeof(ns_src));
    113 }
    114 
    115 
    116 void
    117 _nsdbtdump(dbt)
    118 	const ns_dbt *dbt;
    119 {
    120 	int i;
    121 
    122 	printf("%s (%d source%s):", dbt->name, dbt->srclistsize,
    123 	    dbt->srclistsize == 1 ? "" : "s");
    124 	for (i = 0; i < dbt->srclistsize; i++) {
    125 		printf(" %s", dbt->srclist[i].name);
    126 		if (!(dbt->srclist[i].flags &
    127 		    (NS_UNAVAIL|NS_NOTFOUND|NS_TRYAGAIN)) &&
    128 		    (dbt->srclist[i].flags & NS_SUCCESS))
    129 			continue;
    130 		printf(" [");
    131 		if (!(dbt->srclist[i].flags & NS_SUCCESS))
    132 			printf(" SUCCESS=continue");
    133 		if (dbt->srclist[i].flags & NS_UNAVAIL)
    134 			printf(" UNAVAIL=return");
    135 		if (dbt->srclist[i].flags & NS_NOTFOUND)
    136 			printf(" NOTFOUND=return");
    137 		if (dbt->srclist[i].flags & NS_TRYAGAIN)
    138 			printf(" TRYAGAIN=return");
    139 		printf(" ]");
    140 	}
    141 	printf("\n");
    142 }
    143 
    144 
    145 const ns_dbt *
    146 _nsdbtget(name)
    147 	const char	*name;
    148 {
    149 	static	time_t	 confmod;
    150 
    151 	struct stat	 statbuf;
    152 	ns_dbt		 dbt;
    153 
    154 	extern	FILE 	*_nsyyin;
    155 	extern	int	 _nsyyparse __P((void));
    156 
    157 	dbt.name = name;
    158 
    159 	if (confmod) {
    160 		if (stat(_PATH_NS_CONF, &statbuf) == -1)
    161 			return (NULL);
    162 		if (confmod < statbuf.st_mtime) {
    163 			int i, j;
    164 
    165 			for (i = 0; i < _nsmapsize; i++) {
    166 				for (j = 0; j < _nsmap[i].srclistsize; j++) {
    167 					if (_nsmap[i].srclist[j].name != NULL) {
    168 						/*LINTED const cast*/
    169 						free((void *)
    170 						    _nsmap[i].srclist[j].name);
    171 					}
    172 				}
    173 				if (_nsmap[i].srclist)
    174 					free(_nsmap[i].srclist);
    175 				if (_nsmap[i].name) {
    176 					/*LINTED const cast*/
    177 					free((void *)_nsmap[i].name);
    178 				}
    179 			}
    180 			if (_nsmap)
    181 				free(_nsmap);
    182 			_nsmap = NULL;
    183 			_nsmapsize = 0;
    184 			confmod = 0;
    185 		}
    186 	}
    187 	if (!confmod) {
    188 		if (stat(_PATH_NS_CONF, &statbuf) == -1)
    189 			return (NULL);
    190 		_nsyyin = fopen(_PATH_NS_CONF, "r");
    191 		if (_nsyyin == NULL)
    192 			return (NULL);
    193 		_nsyyparse();
    194 		(void)fclose(_nsyyin);
    195 		qsort(_nsmap, (size_t)_nsmapsize, sizeof(ns_dbt), _nscmp);
    196 		confmod = statbuf.st_mtime;
    197 	}
    198 	return (bsearch(&dbt, _nsmap, (size_t)_nsmapsize, sizeof(ns_dbt),
    199 	    _nscmp));
    200 }
    201 
    202 
    203 void
    204 _nsdbtput(dbt)
    205 	const ns_dbt *dbt;
    206 {
    207 	int	i;
    208 
    209 	for (i = 0; i < _nsmapsize; i++) {
    210 		if (_nscmp(dbt, &_nsmap[i]) == 0) {
    211 					/* overwrite existing entry */
    212 			if (_nsmap[i].srclist != NULL)
    213 				free(_nsmap[i].srclist);
    214 			memmove(&_nsmap[i], dbt, sizeof(ns_dbt));
    215 			return;
    216 		}
    217 	}
    218 
    219 	if ((_nsmapsize % NSELEMSPERCHUNK) == 0) {
    220 		_nsmap = (ns_dbt *)realloc(_nsmap,
    221 		    (_nsmapsize + NSELEMSPERCHUNK) * sizeof(ns_dbt));
    222 		if (_nsmap == NULL)
    223 			err(1, "nsdispatch: memory allocation failure");
    224 	}
    225 	memmove(&_nsmap[_nsmapsize++], dbt, sizeof(ns_dbt));
    226 }
    227 
    228 
    229 int
    230 #if __STDC__
    231 nsdispatch(void *retval, const ns_dtab disp_tab[], const char *database,
    232 	    const char *method, const ns_src defaults[], ...)
    233 #else
    234 nsdispatch(retval, disp_tab, database, method, defaults, va_alist)
    235 	void		*retval;
    236 	const ns_dtab	 disp_tab[];
    237 	const char	*database;
    238 	const char	*method;
    239 	const ns_src	 defaults[];
    240 	va_dcl
    241 #endif
    242 {
    243 	va_list		 ap;
    244 	int		 i, curdisp, result;
    245 	const ns_dbt	*dbt;
    246 	const ns_src	*srclist;
    247 	int		 srclistsize;
    248 
    249 	dbt = _nsdbtget(database);
    250 	if (dbt != NULL) {
    251 		srclist = dbt->srclist;
    252 		srclistsize = dbt->srclistsize;
    253 	} else {
    254 		srclist = defaults;
    255 		srclistsize = 0;
    256 		while (srclist[srclistsize].name != NULL)
    257 			srclistsize++;
    258 	}
    259 	result = 0;
    260 
    261 	for (i = 0; i < srclistsize; i++) {
    262 		for (curdisp = 0; disp_tab[curdisp].src != NULL; curdisp++)
    263 			if (strcasecmp(disp_tab[curdisp].src,
    264 			    srclist[i].name) == 0)
    265 				break;
    266 		result = 0;
    267 		if (disp_tab[curdisp].callback) {
    268 #if __STDC__
    269 			va_start(ap, defaults);
    270 #else
    271 			va_start(ap);
    272 #endif
    273 			result = disp_tab[curdisp].callback(retval,
    274 			    disp_tab[curdisp].cb_data, ap);
    275 			va_end(ap);
    276 			if (result & srclist[i].flags) {
    277 				break;
    278 			}
    279 		}
    280 	}
    281 	return (result ? result : NS_NOTFOUND);
    282 }
    283