Home | History | Annotate | Line # | Download | only in net
nsdispatch.c revision 1.17 
      1 /*	$NetBSD: nsdispatch.c,v 1.17 2000/12/20 20:51:08 christos 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 1.17 2000/12/20 20:51:08 christos 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 <assert.h>
     51 #include <err.h>
     52 #include <fcntl.h>
     53 #define _NS_PRIVATE
     54 #include <nsswitch.h>
     55 #include <stdio.h>
     56 #include <stdlib.h>
     57 #include <string.h>
     58 #include <unistd.h>
     59 
     60 #ifdef __STDC__
     61 #include <stdarg.h>
     62 #else
     63 #include <varargs.h>
     64 #endif
     65 
     66 extern	FILE 	*_nsyyin;
     67 extern	int	 _nsyyparse __P((void));
     68 
     69 
     70 #ifdef __weak_alias
     71 __weak_alias(nsdispatch,_nsdispatch)
     72 #endif
     73 
     74 
     75 /*
     76  * default sourcelist: `files'
     77  */
     78 const ns_src __nsdefaultsrc[] = {
     79 	{ NSSRC_FILES, NS_SUCCESS },
     80 	{ 0 },
     81 };
     82 
     83 
     84 static	int			 _nsmapsize = 0;
     85 static	ns_dbt			*_nsmap = NULL;
     86 
     87 /*
     88  * size of dynamic array chunk for _nsmap and _nsmap[x].srclist
     89  */
     90 #define NSELEMSPERCHUNK		8
     91 
     92 
     93 int	_nscmp __P((const void *, const void *));
     94 
     95 
     96 int
     97 _nscmp(a, b)
     98 	const void *a;
     99 	const void *b;
    100 {
    101 	return (strcasecmp(((const ns_dbt *)a)->name,
    102 	    ((const ns_dbt *)b)->name));
    103 }
    104 
    105 
    106 int
    107 _nsdbtaddsrc(dbt, src)
    108 	ns_dbt		*dbt;
    109 	const ns_src	*src;
    110 {
    111 
    112 	_DIAGASSERT(dbt != NULL);
    113 	_DIAGASSERT(src != NULL);
    114 
    115 	if ((dbt->srclistsize % NSELEMSPERCHUNK) == 0) {
    116 		ns_src *new;
    117 
    118 		new = (ns_src *)realloc(dbt->srclist,
    119 		    (dbt->srclistsize + NSELEMSPERCHUNK) * sizeof(ns_src));
    120 		if (new == NULL)
    121 			return (-1);
    122 		dbt->srclist = new;
    123 	}
    124 	memmove(&dbt->srclist[dbt->srclistsize++], src, sizeof(ns_src));
    125 	return (0);
    126 }
    127 
    128 
    129 void
    130 _nsdbtdump(dbt)
    131 	const ns_dbt *dbt;
    132 {
    133 	int i;
    134 
    135 	_DIAGASSERT(dbt != NULL);
    136 
    137 	printf("%s (%d source%s):", dbt->name, dbt->srclistsize,
    138 	    dbt->srclistsize == 1 ? "" : "s");
    139 	for (i = 0; i < dbt->srclistsize; i++) {
    140 		printf(" %s", dbt->srclist[i].name);
    141 		if (!(dbt->srclist[i].flags &
    142 		    (NS_UNAVAIL|NS_NOTFOUND|NS_TRYAGAIN)) &&
    143 		    (dbt->srclist[i].flags & NS_SUCCESS))
    144 			continue;
    145 		printf(" [");
    146 		if (!(dbt->srclist[i].flags & NS_SUCCESS))
    147 			printf(" SUCCESS=continue");
    148 		if (dbt->srclist[i].flags & NS_UNAVAIL)
    149 			printf(" UNAVAIL=return");
    150 		if (dbt->srclist[i].flags & NS_NOTFOUND)
    151 			printf(" NOTFOUND=return");
    152 		if (dbt->srclist[i].flags & NS_TRYAGAIN)
    153 			printf(" TRYAGAIN=return");
    154 		printf(" ]");
    155 	}
    156 	printf("\n");
    157 }
    158 
    159 
    160 const ns_dbt *
    161 _nsdbtget(name)
    162 	const char	*name;
    163 {
    164 	static	time_t	 confmod;
    165 
    166 	struct stat	 statbuf;
    167 	ns_dbt		 dbt;
    168 
    169 	_DIAGASSERT(name != NULL);
    170 
    171 	dbt.name = name;
    172 
    173 	if (confmod) {
    174 		if (stat(_PATH_NS_CONF, &statbuf) == -1)
    175 			return (NULL);
    176 		if (confmod < statbuf.st_mtime) {
    177 			int i, j;
    178 
    179 			for (i = 0; i < _nsmapsize; i++) {
    180 				for (j = 0; j < _nsmap[i].srclistsize; j++) {
    181 					if (_nsmap[i].srclist[j].name != NULL) {
    182 						/*LINTED const cast*/
    183 						free((void *)
    184 						    _nsmap[i].srclist[j].name);
    185 					}
    186 				}
    187 				if (_nsmap[i].srclist)
    188 					free(_nsmap[i].srclist);
    189 				if (_nsmap[i].name) {
    190 					/*LINTED const cast*/
    191 					free((void *)_nsmap[i].name);
    192 				}
    193 			}
    194 			if (_nsmap)
    195 				free(_nsmap);
    196 			_nsmap = NULL;
    197 			_nsmapsize = 0;
    198 			confmod = 0;
    199 		}
    200 	}
    201 	if (!confmod) {
    202 		if (stat(_PATH_NS_CONF, &statbuf) == -1)
    203 			return (NULL);
    204 		_nsyyin = fopen(_PATH_NS_CONF, "r");
    205 		if (_nsyyin == NULL)
    206 			return (NULL);
    207 		_nsyyparse();
    208 		(void)fclose(_nsyyin);
    209 		qsort(_nsmap, (size_t)_nsmapsize, sizeof(ns_dbt), _nscmp);
    210 		confmod = statbuf.st_mtime;
    211 	}
    212 	return (bsearch(&dbt, _nsmap, (size_t)_nsmapsize, sizeof(ns_dbt),
    213 	    _nscmp));
    214 }
    215 
    216 
    217 int
    218 _nsdbtput(dbt)
    219 	const ns_dbt *dbt;
    220 {
    221 	int	i;
    222 
    223 	_DIAGASSERT(dbt != NULL);
    224 
    225 	for (i = 0; i < _nsmapsize; i++) {
    226 		if (_nscmp(dbt, &_nsmap[i]) == 0) {
    227 					/* overwrite existing entry */
    228 			if (_nsmap[i].srclist != NULL)
    229 				free(_nsmap[i].srclist);
    230 			memmove(&_nsmap[i], dbt, sizeof(ns_dbt));
    231 			return (0);
    232 		}
    233 	}
    234 
    235 	if ((_nsmapsize % NSELEMSPERCHUNK) == 0) {
    236 		ns_dbt *new;
    237 
    238 		new = (ns_dbt *)realloc(_nsmap,
    239 		    (_nsmapsize + NSELEMSPERCHUNK) * sizeof(ns_dbt));
    240 		if (new == NULL)
    241 			return (-1);
    242 		_nsmap = new;
    243 	}
    244 	memmove(&_nsmap[_nsmapsize++], dbt, sizeof(ns_dbt));
    245 	return (0);
    246 }
    247 
    248 
    249 int
    250 /*ARGSUSED*/
    251 #if __STDC__
    252 nsdispatch(void *retval, const ns_dtab disp_tab[], const char *database,
    253 	    const char *method, const ns_src defaults[], ...)
    254 #else
    255 nsdispatch(retval, disp_tab, database, method, defaults, va_alist)
    256 	void		*retval;
    257 	const ns_dtab	 disp_tab[];
    258 	const char	*database;
    259 	const char	*method;
    260 	const ns_src	 defaults[];
    261 	va_dcl
    262 #endif
    263 {
    264 	va_list		 ap;
    265 	int		 i, curdisp, result;
    266 	const ns_dbt	*dbt;
    267 	const ns_src	*srclist;
    268 	int		 srclistsize;
    269 
    270 	_DIAGASSERT(database != NULL);
    271 	_DIAGASSERT(method != NULL);
    272 	if (database == NULL || method == NULL)
    273 		return (NS_UNAVAIL);
    274 
    275 	dbt = _nsdbtget(database);
    276 	if (dbt != NULL) {
    277 		srclist = dbt->srclist;
    278 		srclistsize = dbt->srclistsize;
    279 	} else {
    280 		srclist = defaults;
    281 		srclistsize = 0;
    282 		while (srclist[srclistsize].name != NULL)
    283 			srclistsize++;
    284 	}
    285 	result = 0;
    286 
    287 	for (i = 0; i < srclistsize; i++) {
    288 		for (curdisp = 0; disp_tab[curdisp].src != NULL; curdisp++)
    289 			if (strcasecmp(disp_tab[curdisp].src,
    290 			    srclist[i].name) == 0)
    291 				break;
    292 		result = 0;
    293 		if (disp_tab[curdisp].callback) {
    294 #if __STDC__
    295 			va_start(ap, defaults);
    296 #else
    297 			va_start(ap);
    298 #endif
    299 			result = disp_tab[curdisp].callback(retval,
    300 			    disp_tab[curdisp].cb_data, ap);
    301 			va_end(ap);
    302 			if (result & srclist[i].flags) {
    303 				break;
    304 			}
    305 		}
    306 	}
    307 	return (result ? result : NS_NOTFOUND);
    308 }
    309