1 /* $NetBSD: nsdispatch.c,v 1.18 2002/05/26 14:48:19 wiz 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 1.18 2002/05/26 14:48:19 wiz 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 <stdarg.h> 56 #include <stdio.h> 57 #include <stdlib.h> 58 #include <string.h> 59 #include <unistd.h> 60 61 extern FILE *_nsyyin; 62 extern int _nsyyparse __P((void)); 63 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 int 102 _nsdbtaddsrc(dbt, src) 103 ns_dbt *dbt; 104 const ns_src *src; 105 { 106 107 _DIAGASSERT(dbt != NULL); 108 _DIAGASSERT(src != NULL); 109 110 if ((dbt->srclistsize % NSELEMSPERCHUNK) == 0) { 111 ns_src *new; 112 113 new = (ns_src *)realloc(dbt->srclist, 114 (dbt->srclistsize + NSELEMSPERCHUNK) * sizeof(ns_src)); 115 if (new == NULL) 116 return (-1); 117 dbt->srclist = new; 118 } 119 memmove(&dbt->srclist[dbt->srclistsize++], src, sizeof(ns_src)); 120 return (0); 121 } 122 123 124 void 125 _nsdbtdump(dbt) 126 const ns_dbt *dbt; 127 { 128 int i; 129 130 _DIAGASSERT(dbt != NULL); 131 132 printf("%s (%d source%s):", dbt->name, dbt->srclistsize, 133 dbt->srclistsize == 1 ? "" : "s"); 134 for (i = 0; i < dbt->srclistsize; i++) { 135 printf(" %s", dbt->srclist[i].name); 136 if (!(dbt->srclist[i].flags & 137 (NS_UNAVAIL|NS_NOTFOUND|NS_TRYAGAIN)) && 138 (dbt->srclist[i].flags & NS_SUCCESS)) 139 continue; 140 printf(" ["); 141 if (!(dbt->srclist[i].flags & NS_SUCCESS)) 142 printf(" SUCCESS=continue"); 143 if (dbt->srclist[i].flags & NS_UNAVAIL) 144 printf(" UNAVAIL=return"); 145 if (dbt->srclist[i].flags & NS_NOTFOUND) 146 printf(" NOTFOUND=return"); 147 if (dbt->srclist[i].flags & NS_TRYAGAIN) 148 printf(" TRYAGAIN=return"); 149 printf(" ]"); 150 } 151 printf("\n"); 152 } 153 154 155 const ns_dbt * 156 _nsdbtget(name) 157 const char *name; 158 { 159 static time_t confmod; 160 161 struct stat statbuf; 162 ns_dbt dbt; 163 164 _DIAGASSERT(name != NULL); 165 166 dbt.name = name; 167 168 if (confmod) { 169 if (stat(_PATH_NS_CONF, &statbuf) == -1) 170 return (NULL); 171 if (confmod < statbuf.st_mtime) { 172 int i, j; 173 174 for (i = 0; i < _nsmapsize; i++) { 175 for (j = 0; j < _nsmap[i].srclistsize; j++) { 176 if (_nsmap[i].srclist[j].name != NULL) { 177 /*LINTED const cast*/ 178 free((void *) 179 _nsmap[i].srclist[j].name); 180 } 181 } 182 if (_nsmap[i].srclist) 183 free(_nsmap[i].srclist); 184 if (_nsmap[i].name) { 185 /*LINTED const cast*/ 186 free((void *)_nsmap[i].name); 187 } 188 } 189 if (_nsmap) 190 free(_nsmap); 191 _nsmap = NULL; 192 _nsmapsize = 0; 193 confmod = 0; 194 } 195 } 196 if (!confmod) { 197 if (stat(_PATH_NS_CONF, &statbuf) == -1) 198 return (NULL); 199 _nsyyin = fopen(_PATH_NS_CONF, "r"); 200 if (_nsyyin == NULL) 201 return (NULL); 202 _nsyyparse(); 203 (void)fclose(_nsyyin); 204 qsort(_nsmap, (size_t)_nsmapsize, sizeof(ns_dbt), _nscmp); 205 confmod = statbuf.st_mtime; 206 } 207 return (bsearch(&dbt, _nsmap, (size_t)_nsmapsize, sizeof(ns_dbt), 208 _nscmp)); 209 } 210 211 212 int 213 _nsdbtput(dbt) 214 const ns_dbt *dbt; 215 { 216 int i; 217 218 _DIAGASSERT(dbt != NULL); 219 220 for (i = 0; i < _nsmapsize; i++) { 221 if (_nscmp(dbt, &_nsmap[i]) == 0) { 222 /* overwrite existing entry */ 223 if (_nsmap[i].srclist != NULL) 224 free(_nsmap[i].srclist); 225 memmove(&_nsmap[i], dbt, sizeof(ns_dbt)); 226 return (0); 227 } 228 } 229 230 if ((_nsmapsize % NSELEMSPERCHUNK) == 0) { 231 ns_dbt *new; 232 233 new = (ns_dbt *)realloc(_nsmap, 234 (_nsmapsize + NSELEMSPERCHUNK) * sizeof(ns_dbt)); 235 if (new == NULL) 236 return (-1); 237 _nsmap = new; 238 } 239 memmove(&_nsmap[_nsmapsize++], dbt, sizeof(ns_dbt)); 240 return (0); 241 } 242 243 244 int 245 /*ARGSUSED*/ 246 nsdispatch(void *retval, const ns_dtab disp_tab[], const char *database, 247 const char *method, const ns_src defaults[], ...) 248 { 249 va_list ap; 250 int i, curdisp, result; 251 const ns_dbt *dbt; 252 const ns_src *srclist; 253 int srclistsize; 254 255 _DIAGASSERT(database != NULL); 256 _DIAGASSERT(method != NULL); 257 if (database == NULL || method == NULL) 258 return (NS_UNAVAIL); 259 260 dbt = _nsdbtget(database); 261 if (dbt != NULL) { 262 srclist = dbt->srclist; 263 srclistsize = dbt->srclistsize; 264 } else { 265 srclist = defaults; 266 srclistsize = 0; 267 while (srclist[srclistsize].name != NULL) 268 srclistsize++; 269 } 270 result = 0; 271 272 for (i = 0; i < srclistsize; i++) { 273 for (curdisp = 0; disp_tab[curdisp].src != NULL; curdisp++) 274 if (strcasecmp(disp_tab[curdisp].src, 275 srclist[i].name) == 0) 276 break; 277 result = 0; 278 if (disp_tab[curdisp].callback) { 279 va_start(ap, defaults); 280 result = disp_tab[curdisp].callback(retval, 281 disp_tab[curdisp].cb_data, ap); 282 va_end(ap); 283 if (result & srclist[i].flags) { 284 break; 285 } 286 } 287 } 288 return (result ? result : NS_NOTFOUND); 289 } 290