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nsdispatch.c revision 1.6 
      1 /*	$NetBSD: nsdispatch.c,v 1.6 1999/01/20 11:49:33 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 "namespace.h"
     40 
     41 #include <sys/types.h>
     42 #include <sys/param.h>
     43 #include <sys/stat.h>
     44 
     45 #include <err.h>
     46 #include <fcntl.h>
     47 #define _NS_PRIVATE
     48 #include <nsswitch.h>
     49 #include <stdio.h>
     50 #include <stdlib.h>
     51 #include <string.h>
     52 #include <unistd.h>
     53 
     54 #ifdef __weak_alias
     55 __weak_alias(nsdispatch,_nsdispatch);
     56 #endif
     57 
     58 
     59 /*
     60  * default sourcelist: `files'
     61  */
     62 const ns_src __nsdefaultsrc[] = {
     63 	{ NSSRC_FILES, NS_SUCCESS },
     64 	{ 0 },
     65 };
     66 
     67 
     68 static	int			 _nsmapsize = 0;
     69 static	ns_dbt			*_nsmap = NULL;
     70 
     71 /*
     72  * size of dynamic array chunk for _nsmap and _nsmap[x].srclist
     73  */
     74 #define NSELEMSPERCHUNK		8
     75 
     76 
     77 int	_nscmp __P((const void *, const void *));
     78 
     79 
     80 int
     81 _nscmp(a, b)
     82 	const void *a;
     83 	const void *b;
     84 {
     85 	return (strcasecmp(((ns_dbt *)a)->name, ((ns_dbt *)b)->name));
     86 }
     87 
     88 
     89 void
     90 _nsdbtaddsrc(dbt, src)
     91 	ns_dbt		*dbt;
     92 	const ns_src	*src;
     93 {
     94 	if ((dbt->srclistsize % NSELEMSPERCHUNK) == 0) {
     95 		dbt->srclist = (ns_src *)realloc(dbt->srclist,
     96 		    (dbt->srclistsize + NSELEMSPERCHUNK) * sizeof(ns_src));
     97 		if (dbt->srclist == NULL)
     98 			err(1, "nsdispatch: memory allocation failure");
     99 	}
    100 	memmove((void *)&dbt->srclist[dbt->srclistsize++], (void *)src,
    101 	    sizeof(ns_src));
    102 }
    103 
    104 
    105 void
    106 _nsdbtdump(dbt)
    107 	const ns_dbt *dbt;
    108 {
    109 	int i;
    110 
    111 	printf("%s (%d source%s):", dbt->name, dbt->srclistsize,
    112 	    dbt->srclistsize == 1 ? "" : "s");
    113 	for (i = 0; i < dbt->srclistsize; i++) {
    114 		printf(" %s", dbt->srclist[i].name);
    115 		if (!(dbt->srclist[i].flags &
    116 		    (NS_UNAVAIL|NS_NOTFOUND|NS_TRYAGAIN)) &&
    117 		    (dbt->srclist[i].flags & NS_SUCCESS))
    118 			continue;
    119 		printf(" [");
    120 		if (!(dbt->srclist[i].flags & NS_SUCCESS))
    121 			printf(" SUCCESS=continue");
    122 		if (dbt->srclist[i].flags & NS_UNAVAIL)
    123 			printf(" UNAVAIL=return");
    124 		if (dbt->srclist[i].flags & NS_NOTFOUND)
    125 			printf(" NOTFOUND=return");
    126 		if (dbt->srclist[i].flags & NS_TRYAGAIN)
    127 			printf(" TRYAGAIN=return");
    128 		printf(" ]");
    129 	}
    130 	printf("\n");
    131 }
    132 
    133 
    134 const ns_dbt *
    135 _nsdbtget(name)
    136 	const char	*name;
    137 {
    138 	static	time_t	 confmod;
    139 
    140 	struct stat	 statbuf;
    141 	ns_dbt		 dbt;
    142 
    143 	extern	FILE 	*_nsyyin;
    144 	extern	int	 _nsyyparse __P((void));
    145 
    146 	dbt.name = name;
    147 
    148 	if (confmod) {
    149 		if (stat(_PATH_NS_CONF, &statbuf) == -1)
    150 			return (NULL);
    151 		if (confmod < statbuf.st_mtime) {
    152 			int i, j;
    153 
    154 			for (i = 0; i < _nsmapsize; i++) {
    155 				for (j = 0; j < _nsmap[i].srclistsize; j++) {
    156 					if (_nsmap[i].srclist[j].name != NULL)
    157 						free((char *)
    158 						    _nsmap[i].srclist[j].name);
    159 				}
    160 				if (_nsmap[i].srclist)
    161 					free(_nsmap[i].srclist);
    162 				if (_nsmap[i].name)
    163 					free((char *)_nsmap[i].name);
    164 			}
    165 			if (_nsmap)
    166 				free(_nsmap);
    167 			_nsmap = NULL;
    168 			_nsmapsize = 0;
    169 			confmod = 0;
    170 		}
    171 	}
    172 	if (!confmod) {
    173 		if (stat(_PATH_NS_CONF, &statbuf) == -1)
    174 			return (NULL);
    175 		_nsyyin = fopen(_PATH_NS_CONF, "r");
    176 		if (_nsyyin == NULL)
    177 			return (NULL);
    178 		_nsyyparse();
    179 		(void)fclose(_nsyyin);
    180 		qsort(_nsmap, _nsmapsize, sizeof(ns_dbt), _nscmp);
    181 		confmod = statbuf.st_mtime;
    182 	}
    183 	return (bsearch(&dbt, _nsmap, _nsmapsize, sizeof(ns_dbt), _nscmp));
    184 }
    185 
    186 
    187 void
    188 _nsdbtput(dbt)
    189 	const ns_dbt *dbt;
    190 {
    191 	int	i;
    192 
    193 	for (i = 0; i < _nsmapsize; i++) {
    194 		if (_nscmp(dbt, &_nsmap[i]) == 0) {
    195 					/* overwrite existing entry */
    196 			if (_nsmap[i].srclist != NULL)
    197 				free(_nsmap[i].srclist);
    198 			memmove((void *)&_nsmap[i], (void *)dbt,
    199 				sizeof(ns_dbt));
    200 			return;
    201 		}
    202 	}
    203 
    204 	if ((_nsmapsize % NSELEMSPERCHUNK) == 0) {
    205 		_nsmap = (ns_dbt *)realloc(_nsmap,
    206 		    (_nsmapsize + NSELEMSPERCHUNK) * sizeof(ns_dbt));
    207 		if (_nsmap == NULL)
    208 			err(1, "nsdispatch: memory allocation failure");
    209 	}
    210 	memmove((void *)&_nsmap[_nsmapsize++], (void *)dbt, sizeof(ns_dbt));
    211 }
    212 
    213 
    214 int
    215 #if __STDC__
    216 nsdispatch(void *retval, const ns_dtab disp_tab[], const char *database,
    217 	    const char *method, const ns_src defaults[], ...)
    218 #else
    219 nsdispatch(retval, disp_tab, database, method, defaults, va_alist)
    220 	void		*retval;
    221 	const ns_dtab	 disp_tab[];
    222 	const char	*database;
    223 	const char	*method;
    224 	const ns_src	 defaults[];
    225 	va_dcl
    226 #endif
    227 {
    228 	va_list		 ap;
    229 	int		 i, curdisp, result;
    230 	const ns_dbt	*dbt;
    231 	const ns_src	*srclist;
    232 	int		 srclistsize;
    233 
    234 	dbt = _nsdbtget(database);
    235 	if (dbt != NULL) {
    236 		srclist = dbt->srclist;
    237 		srclistsize = dbt->srclistsize;
    238 	} else {
    239 		srclist = defaults;
    240 		srclistsize = 0;
    241 		while (srclist[srclistsize].name != NULL)
    242 			srclistsize++;
    243 	}
    244 	result = 0;
    245 
    246 	for (i = 0; i < srclistsize; i++) {
    247 		for (curdisp = 0; disp_tab[curdisp].src != NULL; curdisp++)
    248 			if (strcasecmp(disp_tab[curdisp].src,
    249 			    srclist[i].name) == 0)
    250 				break;
    251 		result = 0;
    252 		if (disp_tab[curdisp].callback) {
    253 #if __STDC__
    254 			va_start(ap, defaults);
    255 #else
    256 			va_start(ap);
    257 #endif
    258 			result = disp_tab[curdisp].callback(retval,
    259 			    disp_tab[curdisp].cb_data, ap);
    260 			va_end(ap);
    261 			if (result & srclist[i].flags) {
    262 				break;
    263 			}
    264 		}
    265 	}
    266 	return (result ? result : NS_NOTFOUND);
    267 }
    268