1 /* $NetBSD: nsdispatch.c,v 1.16 2000/01/22 22:19:16 mycroft 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 1.16 2000/01/22 22:19:16 mycroft 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 #ifdef __weak_alias 67 __weak_alias(nsdispatch,_nsdispatch) 68 #endif 69 70 71 /* 72 * default sourcelist: `files' 73 */ 74 const ns_src __nsdefaultsrc[] = { 75 { NSSRC_FILES, NS_SUCCESS }, 76 { 0 }, 77 }; 78 79 80 static int _nsmapsize = 0; 81 static ns_dbt *_nsmap = NULL; 82 83 /* 84 * size of dynamic array chunk for _nsmap and _nsmap[x].srclist 85 */ 86 #define NSELEMSPERCHUNK 8 87 88 89 int _nscmp __P((const void *, const void *)); 90 91 92 int 93 _nscmp(a, b) 94 const void *a; 95 const void *b; 96 { 97 return (strcasecmp(((const ns_dbt *)a)->name, 98 ((const ns_dbt *)b)->name)); 99 } 100 101 102 int 103 _nsdbtaddsrc(dbt, src) 104 ns_dbt *dbt; 105 const ns_src *src; 106 { 107 108 _DIAGASSERT(dbt != NULL); 109 _DIAGASSERT(src != NULL); 110 111 if ((dbt->srclistsize % NSELEMSPERCHUNK) == 0) { 112 ns_src *new; 113 114 new = (ns_src *)realloc(dbt->srclist, 115 (dbt->srclistsize + NSELEMSPERCHUNK) * sizeof(ns_src)); 116 if (new == NULL) 117 return (-1); 118 dbt->srclist = new; 119 } 120 memmove(&dbt->srclist[dbt->srclistsize++], src, sizeof(ns_src)); 121 return (0); 122 } 123 124 125 void 126 _nsdbtdump(dbt) 127 const ns_dbt *dbt; 128 { 129 int i; 130 131 _DIAGASSERT(dbt != NULL); 132 133 printf("%s (%d source%s):", dbt->name, dbt->srclistsize, 134 dbt->srclistsize == 1 ? "" : "s"); 135 for (i = 0; i < dbt->srclistsize; i++) { 136 printf(" %s", dbt->srclist[i].name); 137 if (!(dbt->srclist[i].flags & 138 (NS_UNAVAIL|NS_NOTFOUND|NS_TRYAGAIN)) && 139 (dbt->srclist[i].flags & NS_SUCCESS)) 140 continue; 141 printf(" ["); 142 if (!(dbt->srclist[i].flags & NS_SUCCESS)) 143 printf(" SUCCESS=continue"); 144 if (dbt->srclist[i].flags & NS_UNAVAIL) 145 printf(" UNAVAIL=return"); 146 if (dbt->srclist[i].flags & NS_NOTFOUND) 147 printf(" NOTFOUND=return"); 148 if (dbt->srclist[i].flags & NS_TRYAGAIN) 149 printf(" TRYAGAIN=return"); 150 printf(" ]"); 151 } 152 printf("\n"); 153 } 154 155 156 const ns_dbt * 157 _nsdbtget(name) 158 const char *name; 159 { 160 static time_t confmod; 161 162 struct stat statbuf; 163 ns_dbt dbt; 164 165 extern FILE *_nsyyin; 166 extern int _nsyyparse __P((void)); 167 168 _DIAGASSERT(name != NULL); 169 170 dbt.name = name; 171 172 if (confmod) { 173 if (stat(_PATH_NS_CONF, &statbuf) == -1) 174 return (NULL); 175 if (confmod < statbuf.st_mtime) { 176 int i, j; 177 178 for (i = 0; i < _nsmapsize; i++) { 179 for (j = 0; j < _nsmap[i].srclistsize; j++) { 180 if (_nsmap[i].srclist[j].name != NULL) { 181 /*LINTED const cast*/ 182 free((void *) 183 _nsmap[i].srclist[j].name); 184 } 185 } 186 if (_nsmap[i].srclist) 187 free(_nsmap[i].srclist); 188 if (_nsmap[i].name) { 189 /*LINTED const cast*/ 190 free((void *)_nsmap[i].name); 191 } 192 } 193 if (_nsmap) 194 free(_nsmap); 195 _nsmap = NULL; 196 _nsmapsize = 0; 197 confmod = 0; 198 } 199 } 200 if (!confmod) { 201 if (stat(_PATH_NS_CONF, &statbuf) == -1) 202 return (NULL); 203 _nsyyin = fopen(_PATH_NS_CONF, "r"); 204 if (_nsyyin == NULL) 205 return (NULL); 206 _nsyyparse(); 207 (void)fclose(_nsyyin); 208 qsort(_nsmap, (size_t)_nsmapsize, sizeof(ns_dbt), _nscmp); 209 confmod = statbuf.st_mtime; 210 } 211 return (bsearch(&dbt, _nsmap, (size_t)_nsmapsize, sizeof(ns_dbt), 212 _nscmp)); 213 } 214 215 216 int 217 _nsdbtput(dbt) 218 const ns_dbt *dbt; 219 { 220 int i; 221 222 _DIAGASSERT(dbt != NULL); 223 224 for (i = 0; i < _nsmapsize; i++) { 225 if (_nscmp(dbt, &_nsmap[i]) == 0) { 226 /* overwrite existing entry */ 227 if (_nsmap[i].srclist != NULL) 228 free(_nsmap[i].srclist); 229 memmove(&_nsmap[i], dbt, sizeof(ns_dbt)); 230 return (0); 231 } 232 } 233 234 if ((_nsmapsize % NSELEMSPERCHUNK) == 0) { 235 ns_dbt *new; 236 237 new = (ns_dbt *)realloc(_nsmap, 238 (_nsmapsize + NSELEMSPERCHUNK) * sizeof(ns_dbt)); 239 if (new == NULL) 240 return (-1); 241 _nsmap = new; 242 } 243 memmove(&_nsmap[_nsmapsize++], dbt, sizeof(ns_dbt)); 244 return (0); 245 } 246 247 248 int 249 /*ARGSUSED*/ 250 #if __STDC__ 251 nsdispatch(void *retval, const ns_dtab disp_tab[], const char *database, 252 const char *method, const ns_src defaults[], ...) 253 #else 254 nsdispatch(retval, disp_tab, database, method, defaults, va_alist) 255 void *retval; 256 const ns_dtab disp_tab[]; 257 const char *database; 258 const char *method; 259 const ns_src defaults[]; 260 va_dcl 261 #endif 262 { 263 va_list ap; 264 int i, curdisp, result; 265 const ns_dbt *dbt; 266 const ns_src *srclist; 267 int srclistsize; 268 269 _DIAGASSERT(database != NULL); 270 _DIAGASSERT(method != NULL); 271 if (database == NULL || method == NULL) 272 return (NS_UNAVAIL); 273 274 dbt = _nsdbtget(database); 275 if (dbt != NULL) { 276 srclist = dbt->srclist; 277 srclistsize = dbt->srclistsize; 278 } else { 279 srclist = defaults; 280 srclistsize = 0; 281 while (srclist[srclistsize].name != NULL) 282 srclistsize++; 283 } 284 result = 0; 285 286 for (i = 0; i < srclistsize; i++) { 287 for (curdisp = 0; disp_tab[curdisp].src != NULL; curdisp++) 288 if (strcasecmp(disp_tab[curdisp].src, 289 srclist[i].name) == 0) 290 break; 291 result = 0; 292 if (disp_tab[curdisp].callback) { 293 #if __STDC__ 294 va_start(ap, defaults); 295 #else 296 va_start(ap); 297 #endif 298 result = disp_tab[curdisp].callback(retval, 299 disp_tab[curdisp].cb_data, ap); 300 va_end(ap); 301 if (result & srclist[i].flags) { 302 break; 303 } 304 } 305 } 306 return (result ? result : NS_NOTFOUND); 307 } 308