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nsdispatch.c revision 1.5 
      1 /*	$NetBSD: nsdispatch.c,v 1.5 1999/01/19 07:58:05 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/types.h>
     40 #include <sys/param.h>
     41 #include <sys/stat.h>
     42 
     43 #include <err.h>
     44 #include <fcntl.h>
     45 #define _NS_PRIVATE
     46 #include <nsswitch.h>
     47 #include <stdio.h>
     48 #include <stdlib.h>
     49 #include <string.h>
     50 #include <unistd.h>
     51 
     52 
     53 /*
     54  * default sourcelist: `files'
     55  */
     56 const ns_src __nsdefaultsrc[] = {
     57 	{ NSSRC_FILES, NS_SUCCESS },
     58 	{ 0 },
     59 };
     60 
     61 
     62 static	int			 _nsmapsize = 0;
     63 static	ns_dbt			*_nsmap = NULL;
     64 
     65 /*
     66  * size of dynamic array chunk for _nsmap and _nsmap[x].srclist
     67  */
     68 #define NSELEMSPERCHUNK		8
     69 
     70 
     71 int	_nscmp __P((const void *, const void *));
     72 
     73 
     74 int
     75 _nscmp(a, b)
     76 	const void *a;
     77 	const void *b;
     78 {
     79 	return (strcasecmp(((ns_dbt *)a)->name, ((ns_dbt *)b)->name));
     80 }
     81 
     82 
     83 void
     84 _nsdbtaddsrc(dbt, src)
     85 	ns_dbt		*dbt;
     86 	const ns_src	*src;
     87 {
     88 	if ((dbt->srclistsize % NSELEMSPERCHUNK) == 0) {
     89 		dbt->srclist = (ns_src *)realloc(dbt->srclist,
     90 		    (dbt->srclistsize + NSELEMSPERCHUNK) * sizeof(ns_src));
     91 		if (dbt->srclist == NULL)
     92 			err(1, "nsdispatch: memory allocation failure");
     93 	}
     94 	memmove((void *)&dbt->srclist[dbt->srclistsize++], (void *)src,
     95 	    sizeof(ns_src));
     96 }
     97 
     98 
     99 void
    100 _nsdbtdump(dbt)
    101 	const ns_dbt *dbt;
    102 {
    103 	int i;
    104 
    105 	printf("%s (%d source%s):", dbt->name, dbt->srclistsize,
    106 	    dbt->srclistsize == 1 ? "" : "s");
    107 	for (i = 0; i < dbt->srclistsize; i++) {
    108 		printf(" %s", dbt->srclist[i].name);
    109 		if (!(dbt->srclist[i].flags &
    110 		    (NS_UNAVAIL|NS_NOTFOUND|NS_TRYAGAIN)) &&
    111 		    (dbt->srclist[i].flags & NS_SUCCESS))
    112 			continue;
    113 		printf(" [");
    114 		if (!(dbt->srclist[i].flags & NS_SUCCESS))
    115 			printf(" SUCCESS=continue");
    116 		if (dbt->srclist[i].flags & NS_UNAVAIL)
    117 			printf(" UNAVAIL=return");
    118 		if (dbt->srclist[i].flags & NS_NOTFOUND)
    119 			printf(" NOTFOUND=return");
    120 		if (dbt->srclist[i].flags & NS_TRYAGAIN)
    121 			printf(" TRYAGAIN=return");
    122 		printf(" ]");
    123 	}
    124 	printf("\n");
    125 }
    126 
    127 
    128 const ns_dbt *
    129 _nsdbtget(name)
    130 	const char	*name;
    131 {
    132 	static	time_t	 confmod;
    133 
    134 	struct stat	 statbuf;
    135 	ns_dbt		 dbt;
    136 
    137 	extern	FILE 	*_nsyyin;
    138 	extern	int	 _nsyyparse __P((void));
    139 
    140 	dbt.name = name;
    141 
    142 	if (confmod) {
    143 		if (stat(_PATH_NS_CONF, &statbuf) == -1)
    144 			return (NULL);
    145 		if (confmod < statbuf.st_mtime) {
    146 			int i, j;
    147 
    148 			for (i = 0; i < _nsmapsize; i++) {
    149 				for (j = 0; j < _nsmap[i].srclistsize; j++) {
    150 					if (_nsmap[i].srclist[j].name != NULL)
    151 						free((char *)
    152 						    _nsmap[i].srclist[j].name);
    153 				}
    154 				if (_nsmap[i].srclist)
    155 					free(_nsmap[i].srclist);
    156 				if (_nsmap[i].name)
    157 					free((char *)_nsmap[i].name);
    158 			}
    159 			if (_nsmap)
    160 				free(_nsmap);
    161 			_nsmap = NULL;
    162 			_nsmapsize = 0;
    163 			confmod = 0;
    164 		}
    165 	}
    166 	if (!confmod) {
    167 		if (stat(_PATH_NS_CONF, &statbuf) == -1)
    168 			return (NULL);
    169 		_nsyyin = fopen(_PATH_NS_CONF, "r");
    170 		if (_nsyyin == NULL)
    171 			return (NULL);
    172 		_nsyyparse();
    173 		(void)fclose(_nsyyin);
    174 		qsort(_nsmap, _nsmapsize, sizeof(ns_dbt), _nscmp);
    175 		confmod = statbuf.st_mtime;
    176 	}
    177 	return (bsearch(&dbt, _nsmap, _nsmapsize, sizeof(ns_dbt), _nscmp));
    178 }
    179 
    180 
    181 void
    182 _nsdbtput(dbt)
    183 	const ns_dbt *dbt;
    184 {
    185 	int	i;
    186 
    187 	for (i = 0; i < _nsmapsize; i++) {
    188 		if (_nscmp(dbt, &_nsmap[i]) == 0) {
    189 					/* overwrite existing entry */
    190 			if (_nsmap[i].srclist != NULL)
    191 				free(_nsmap[i].srclist);
    192 			memmove((void *)&_nsmap[i], (void *)dbt,
    193 				sizeof(ns_dbt));
    194 			return;
    195 		}
    196 	}
    197 
    198 	if ((_nsmapsize % NSELEMSPERCHUNK) == 0) {
    199 		_nsmap = (ns_dbt *)realloc(_nsmap,
    200 		    (_nsmapsize + NSELEMSPERCHUNK) * sizeof(ns_dbt));
    201 		if (_nsmap == NULL)
    202 			err(1, "nsdispatch: memory allocation failure");
    203 	}
    204 	memmove((void *)&_nsmap[_nsmapsize++], (void *)dbt, sizeof(ns_dbt));
    205 }
    206 
    207 
    208 int
    209 #if __STDC__
    210 nsdispatch(void *retval, const ns_dtab disp_tab[], const char *database,
    211 	    const char *method, const ns_src defaults[], ...)
    212 #else
    213 nsdispatch(retval, disp_tab, database, method, defaults, va_alist)
    214 	void		*retval;
    215 	const ns_dtab	 disp_tab[];
    216 	const char	*database;
    217 	const char	*method;
    218 	const ns_src	 defaults[];
    219 	va_dcl
    220 #endif
    221 {
    222 	va_list		 ap;
    223 	int		 i, curdisp, result;
    224 	const ns_dbt	*dbt;
    225 	const ns_src	*srclist;
    226 	int		 srclistsize;
    227 
    228 	dbt = _nsdbtget(database);
    229 	if (dbt != NULL) {
    230 		srclist = dbt->srclist;
    231 		srclistsize = dbt->srclistsize;
    232 	} else {
    233 		srclist = defaults;
    234 		srclistsize = 0;
    235 		while (srclist[srclistsize].name != NULL)
    236 			srclistsize++;
    237 	}
    238 	result = 0;
    239 
    240 	for (i = 0; i < srclistsize; i++) {
    241 		for (curdisp = 0; disp_tab[curdisp].src != NULL; curdisp++)
    242 			if (strcasecmp(disp_tab[curdisp].src,
    243 			    srclist[i].name) == 0)
    244 				break;
    245 		result = 0;
    246 		if (disp_tab[curdisp].callback) {
    247 #if __STDC__
    248 			va_start(ap, defaults);
    249 #else
    250 			va_start(ap);
    251 #endif
    252 			result = disp_tab[curdisp].callback(retval,
    253 			    disp_tab[curdisp].cb_data, ap);
    254 			va_end(ap);
    255 			if (result & srclist[i].flags) {
    256 				break;
    257 			}
    258 		}
    259 	}
    260 	return (result ? result : NS_NOTFOUND);
    261 }
    262