1 /* $NetBSD: nsdispatch.c,v 1.9 1999/01/25 00:16:17 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 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 /*- 32 * Copyright (c) 2003 Networks Associates Technology, Inc. 33 * All rights reserved. 34 * 35 * Portions of this software were developed for the FreeBSD Project by 36 * Jacques A. Vidrine, Safeport Network Services, and Network 37 * Associates Laboratories, the Security Research Division of Network 38 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 39 * ("CBOSS"), as part of the DARPA CHATS research program. 40 * 41 * Redistribution and use in source and binary forms, with or without 42 * modification, are permitted provided that the following conditions 43 * are met: 44 * 1. Redistributions of source code must retain the above copyright 45 * notice, this list of conditions and the following disclaimer. 46 * 2. Redistributions in binary form must reproduce the above copyright 47 * notice, this list of conditions and the following disclaimer in the 48 * documentation and/or other materials provided with the distribution. 49 * 50 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 51 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 52 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 53 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 54 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 55 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 56 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 57 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 58 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 59 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 60 * SUCH DAMAGE. 61 * 62 */ 63 #include <sys/cdefs.h> 64 __FBSDID("$FreeBSD$"); 65 66 #include "namespace.h" 67 #include <sys/param.h> 68 #include <sys/stat.h> 69 70 #include <dlfcn.h> 71 #include <errno.h> 72 #include <fcntl.h> 73 #define _NS_PRIVATE 74 #include <nsswitch.h> 75 #include <pthread.h> 76 #include <pthread_np.h> 77 #include <stdio.h> 78 #include <stdlib.h> 79 #include <string.h> 80 #include <syslog.h> 81 #include <unistd.h> 82 #include "un-namespace.h" 83 #include "nss_tls.h" 84 #include "libc_private.h" 85 #ifdef NS_CACHING 86 #include "nscache.h" 87 #endif 88 89 enum _nss_constants { 90 /* Number of elements allocated when we grow a vector */ 91 ELEMSPERCHUNK = 8 92 }; 93 94 /* 95 * Global NSS data structures are mostly read-only, but we update 96 * them when we read or re-read the nsswitch.conf. 97 */ 98 static pthread_rwlock_t nss_lock = PTHREAD_RWLOCK_INITIALIZER; 99 100 /* 101 * Runtime determination of whether we are dynamically linked or not. 102 */ 103 extern int _DYNAMIC __attribute__ ((weak)); 104 #define is_dynamic() (&_DYNAMIC != NULL) 105 106 /* 107 * default sourcelist: `files' 108 */ 109 const ns_src __nsdefaultsrc[] = { 110 { NSSRC_FILES, NS_SUCCESS }, 111 { 0 }, 112 }; 113 114 /* Database, source mappings. */ 115 static unsigned int _nsmapsize; 116 static ns_dbt *_nsmap = NULL; 117 118 /* NSS modules. */ 119 static unsigned int _nsmodsize; 120 static ns_mod *_nsmod; 121 122 /* Placeholder for builtin modules' dlopen `handle'. */ 123 static int __nss_builtin_handle; 124 static void *nss_builtin_handle = &__nss_builtin_handle; 125 126 #ifdef NS_CACHING 127 /* 128 * Cache lookup cycle prevention function - if !NULL then no cache lookups 129 * will be made 130 */ 131 static void *nss_cache_cycle_prevention_func = NULL; 132 #endif 133 134 /* 135 * When this is set to 1, nsdispatch won't use nsswitch.conf 136 * but will consult the 'defaults' source list only. 137 * NOTE: nested fallbacks (when nsdispatch calls fallback functions, 138 * which in turn calls nsdispatch, which should call fallback 139 * function) are not supported 140 */ 141 struct fb_state { 142 int fb_dispatch; 143 }; 144 static void fb_endstate(void *); 145 NSS_TLS_HANDLING(fb); 146 147 /* 148 * Attempt to spew relatively uniform messages to syslog. 149 */ 150 #define nss_log(level, fmt, ...) \ 151 syslog((level), "NSSWITCH(%s): " fmt, __func__, __VA_ARGS__) 152 #define nss_log_simple(level, s) \ 153 syslog((level), "NSSWITCH(%s): " s, __func__) 154 155 /* 156 * Dynamically growable arrays are used for lists of databases, sources, 157 * and modules. The following `vector' interface is used to isolate the 158 * common operations. 159 */ 160 typedef int (*vector_comparison)(const void *, const void *); 161 typedef void (*vector_free_elem)(void *); 162 static void vector_sort(void *, unsigned int, size_t, 163 vector_comparison); 164 static void vector_free(void *, unsigned int *, size_t, 165 vector_free_elem); 166 static void *vector_ref(unsigned int, void *, unsigned int, size_t); 167 static void *vector_search(const void *, void *, unsigned int, size_t, 168 vector_comparison); 169 static void *vector_append(const void *, void *, unsigned int *, size_t); 170 171 172 /* 173 * Internal interfaces. 174 */ 175 static int string_compare(const void *, const void *); 176 static int mtab_compare(const void *, const void *); 177 static int nss_configure(void); 178 static void ns_dbt_free(ns_dbt *); 179 static void ns_mod_free(ns_mod *); 180 static void ns_src_free(ns_src **, int); 181 static void nss_load_builtin_modules(void); 182 static void nss_load_module(const char *, nss_module_register_fn); 183 static void nss_atexit(void); 184 /* nsparser */ 185 extern FILE *_nsyyin; 186 187 188 /* 189 * The vector operations 190 */ 191 static void 192 vector_sort(void *vec, unsigned int count, size_t esize, 193 vector_comparison comparison) 194 { 195 qsort(vec, count, esize, comparison); 196 } 197 198 199 static void * 200 vector_search(const void *key, void *vec, unsigned int count, size_t esize, 201 vector_comparison comparison) 202 { 203 return (bsearch(key, vec, count, esize, comparison)); 204 } 205 206 207 static void * 208 vector_append(const void *elem, void *vec, unsigned int *count, size_t esize) 209 { 210 void *p; 211 212 if ((*count % ELEMSPERCHUNK) == 0) { 213 p = realloc(vec, (*count + ELEMSPERCHUNK) * esize); 214 if (p == NULL) { 215 nss_log_simple(LOG_ERR, "memory allocation failure"); 216 return (vec); 217 } 218 vec = p; 219 } 220 memmove((void *)(((uintptr_t)vec) + (*count * esize)), elem, esize); 221 (*count)++; 222 return (vec); 223 } 224 225 226 static void * 227 vector_ref(unsigned int i, void *vec, unsigned int count, size_t esize) 228 { 229 if (i < count) 230 return (void *)((uintptr_t)vec + (i * esize)); 231 else 232 return (NULL); 233 } 234 235 236 #define VECTOR_FREE(v, c, s, f) \ 237 do { vector_free(v, c, s, f); v = NULL; } while (0) 238 static void 239 vector_free(void *vec, unsigned int *count, size_t esize, 240 vector_free_elem free_elem) 241 { 242 unsigned int i; 243 void *elem; 244 245 for (i = 0; i < *count; i++) { 246 elem = vector_ref(i, vec, *count, esize); 247 if (elem != NULL) 248 free_elem(elem); 249 } 250 free(vec); 251 *count = 0; 252 } 253 254 /* 255 * Comparison functions for vector_search. 256 */ 257 static int 258 string_compare(const void *a, const void *b) 259 { 260 return (strcasecmp(*(const char * const *)a, *(const char * const *)b)); 261 } 262 263 264 static int 265 mtab_compare(const void *a, const void *b) 266 { 267 int cmp; 268 269 cmp = strcmp(((const ns_mtab *)a)->name, ((const ns_mtab *)b)->name); 270 if (cmp != 0) 271 return (cmp); 272 else 273 return (strcmp(((const ns_mtab *)a)->database, 274 ((const ns_mtab *)b)->database)); 275 } 276 277 /* 278 * NSS nsmap management. 279 */ 280 void 281 _nsdbtaddsrc(ns_dbt *dbt, const ns_src *src) 282 { 283 const ns_mod *modp; 284 285 dbt->srclist = vector_append(src, dbt->srclist, &dbt->srclistsize, 286 sizeof(*src)); 287 modp = vector_search(&src->name, _nsmod, _nsmodsize, sizeof(*_nsmod), 288 string_compare); 289 if (modp == NULL) 290 nss_load_module(src->name, NULL); 291 } 292 293 294 #ifdef _NSS_DEBUG 295 void 296 _nsdbtdump(const ns_dbt *dbt) 297 { 298 int i; 299 300 printf("%s (%d source%s):", dbt->name, dbt->srclistsize, 301 dbt->srclistsize == 1 ? "" : "s"); 302 for (i = 0; i < (int)dbt->srclistsize; i++) { 303 printf(" %s", dbt->srclist[i].name); 304 if (!(dbt->srclist[i].flags & 305 (NS_UNAVAIL|NS_NOTFOUND|NS_TRYAGAIN)) && 306 (dbt->srclist[i].flags & NS_SUCCESS)) 307 continue; 308 printf(" ["); 309 if (!(dbt->srclist[i].flags & NS_SUCCESS)) 310 printf(" SUCCESS=continue"); 311 if (dbt->srclist[i].flags & NS_UNAVAIL) 312 printf(" UNAVAIL=return"); 313 if (dbt->srclist[i].flags & NS_NOTFOUND) 314 printf(" NOTFOUND=return"); 315 if (dbt->srclist[i].flags & NS_TRYAGAIN) 316 printf(" TRYAGAIN=return"); 317 printf(" ]"); 318 } 319 printf("\n"); 320 } 321 #endif 322 323 324 /* 325 * The first time nsdispatch is called (during a process's lifetime, 326 * or after nsswitch.conf has been updated), nss_configure will 327 * prepare global data needed by NSS. 328 */ 329 static int 330 nss_configure(void) 331 { 332 static time_t confmod; 333 struct stat statbuf; 334 int result, isthreaded; 335 const char *path; 336 #ifdef NS_CACHING 337 void *handle; 338 #endif 339 340 result = 0; 341 isthreaded = __isthreaded; 342 #if defined(_NSS_DEBUG) && defined(_NSS_SHOOT_FOOT) 343 /* NOTE WELL: THIS IS A SECURITY HOLE. This must only be built 344 * for debugging purposes and MUST NEVER be used in production. 345 */ 346 path = getenv("NSSWITCH_CONF"); 347 if (path == NULL) 348 #endif 349 path = _PATH_NS_CONF; 350 if (stat(path, &statbuf) != 0) 351 return (0); 352 if (statbuf.st_mtime <= confmod) 353 return (0); 354 if (isthreaded) { 355 (void)_pthread_rwlock_unlock(&nss_lock); 356 result = _pthread_rwlock_wrlock(&nss_lock); 357 if (result != 0) 358 return (result); 359 if (stat(path, &statbuf) != 0) 360 goto fin; 361 if (statbuf.st_mtime <= confmod) 362 goto fin; 363 } 364 _nsyyin = fopen(path, "re"); 365 if (_nsyyin == NULL) 366 goto fin; 367 VECTOR_FREE(_nsmap, &_nsmapsize, sizeof(*_nsmap), 368 (vector_free_elem)ns_dbt_free); 369 VECTOR_FREE(_nsmod, &_nsmodsize, sizeof(*_nsmod), 370 (vector_free_elem)ns_mod_free); 371 nss_load_builtin_modules(); 372 _nsyyparse(); 373 (void)fclose(_nsyyin); 374 vector_sort(_nsmap, _nsmapsize, sizeof(*_nsmap), string_compare); 375 if (confmod == 0) 376 (void)atexit(nss_atexit); 377 confmod = statbuf.st_mtime; 378 379 #ifdef NS_CACHING 380 handle = libc_dlopen(NULL, RTLD_LAZY | RTLD_GLOBAL); 381 if (handle != NULL) { 382 nss_cache_cycle_prevention_func = dlsym(handle, 383 "_nss_cache_cycle_prevention_function"); 384 dlclose(handle); 385 } 386 #endif 387 fin: 388 if (isthreaded) { 389 (void)_pthread_rwlock_unlock(&nss_lock); 390 if (result == 0) 391 result = _pthread_rwlock_rdlock(&nss_lock); 392 } 393 return (result); 394 } 395 396 397 void 398 _nsdbtput(const ns_dbt *dbt) 399 { 400 unsigned int i; 401 ns_dbt *p; 402 403 for (i = 0; i < _nsmapsize; i++) { 404 p = vector_ref(i, _nsmap, _nsmapsize, sizeof(*_nsmap)); 405 if (string_compare(&dbt->name, &p->name) == 0) { 406 /* overwrite existing entry */ 407 if (p->srclist != NULL) 408 ns_src_free(&p->srclist, p->srclistsize); 409 memmove(p, dbt, sizeof(*dbt)); 410 return; 411 } 412 } 413 _nsmap = vector_append(dbt, _nsmap, &_nsmapsize, sizeof(*_nsmap)); 414 } 415 416 417 static void 418 ns_dbt_free(ns_dbt *dbt) 419 { 420 ns_src_free(&dbt->srclist, dbt->srclistsize); 421 if (dbt->name) 422 free((void *)dbt->name); 423 } 424 425 426 static void 427 ns_src_free(ns_src **src, int srclistsize) 428 { 429 int i; 430 431 for (i = 0; i < srclistsize; i++) 432 if ((*src)[i].name != NULL) 433 /* This one was allocated by nslexer. You'll just 434 * have to trust me. 435 */ 436 free((void *)((*src)[i].name)); 437 free(*src); 438 *src = NULL; 439 } 440 441 442 443 /* 444 * NSS module management. 445 */ 446 /* The built-in NSS modules are all loaded at once. */ 447 #define NSS_BACKEND(name, reg) \ 448 ns_mtab *reg(unsigned int *, nss_module_unregister_fn *); 449 #include "nss_backends.h" 450 #undef NSS_BACKEND 451 452 static void 453 nss_load_builtin_modules(void) 454 { 455 #define NSS_BACKEND(name, reg) nss_load_module(#name, reg); 456 #include "nss_backends.h" 457 #undef NSS_BACKEND 458 } 459 460 461 /* Load a built-in or dynamically linked module. If the `reg_fn' 462 * argument is non-NULL, assume a built-in module and use reg_fn to 463 * register it. Otherwise, search for a dynamic NSS module. 464 */ 465 static void 466 nss_load_module(const char *source, nss_module_register_fn reg_fn) 467 { 468 char buf[PATH_MAX]; 469 ns_mod mod; 470 nss_module_register_fn fn; 471 472 memset(&mod, 0, sizeof(mod)); 473 mod.name = strdup(source); 474 if (mod.name == NULL) { 475 nss_log_simple(LOG_ERR, "memory allocation failure"); 476 return; 477 } 478 if (reg_fn != NULL) { 479 /* The placeholder is required, as a NULL handle 480 * represents an invalid module. 481 */ 482 mod.handle = nss_builtin_handle; 483 fn = reg_fn; 484 } else if (!is_dynamic()) 485 goto fin; 486 else { 487 if (snprintf(buf, sizeof(buf), "nss_%s.so.%d", mod.name, 488 NSS_MODULE_INTERFACE_VERSION) >= (int)sizeof(buf)) 489 goto fin; 490 mod.handle = libc_dlopen(buf, RTLD_LOCAL|RTLD_LAZY); 491 if (mod.handle == NULL) { 492 #ifdef _NSS_DEBUG 493 /* This gets pretty annoying since the built-in 494 * sources aren't modules yet. 495 */ 496 nss_log(LOG_DEBUG, "%s, %s", mod.name, dlerror()); 497 #endif 498 goto fin; 499 } 500 fn = (nss_module_register_fn)dlfunc(mod.handle, 501 "nss_module_register"); 502 if (fn == NULL) { 503 (void)dlclose(mod.handle); 504 mod.handle = NULL; 505 nss_log(LOG_ERR, "%s, %s", mod.name, dlerror()); 506 goto fin; 507 } 508 } 509 mod.mtab = fn(mod.name, &mod.mtabsize, &mod.unregister); 510 if (mod.mtab == NULL || mod.mtabsize == 0) { 511 if (mod.handle != nss_builtin_handle) 512 (void)dlclose(mod.handle); 513 mod.handle = NULL; 514 nss_log(LOG_ERR, "%s, registration failed", mod.name); 515 goto fin; 516 } 517 if (mod.mtabsize > 1) 518 qsort(mod.mtab, mod.mtabsize, sizeof(mod.mtab[0]), 519 mtab_compare); 520 fin: 521 _nsmod = vector_append(&mod, _nsmod, &_nsmodsize, sizeof(*_nsmod)); 522 vector_sort(_nsmod, _nsmodsize, sizeof(*_nsmod), string_compare); 523 } 524 525 526 527 static void 528 ns_mod_free(ns_mod *mod) 529 { 530 531 free(mod->name); 532 if (mod->handle == NULL) 533 return; 534 if (mod->unregister != NULL) 535 mod->unregister(mod->mtab, mod->mtabsize); 536 if (mod->handle != nss_builtin_handle) 537 (void)dlclose(mod->handle); 538 } 539 540 541 542 /* 543 * Cleanup 544 */ 545 static void 546 nss_atexit(void) 547 { 548 int isthreaded; 549 550 isthreaded = __isthreaded; 551 if (isthreaded) 552 (void)_pthread_rwlock_wrlock(&nss_lock); 553 VECTOR_FREE(_nsmap, &_nsmapsize, sizeof(*_nsmap), 554 (vector_free_elem)ns_dbt_free); 555 VECTOR_FREE(_nsmod, &_nsmodsize, sizeof(*_nsmod), 556 (vector_free_elem)ns_mod_free); 557 if (isthreaded) 558 (void)_pthread_rwlock_unlock(&nss_lock); 559 } 560 561 562 563 /* 564 * Finally, the actual implementation. 565 */ 566 static nss_method 567 nss_method_lookup(const char *source, const char *database, 568 const char *method, const ns_dtab disp_tab[], void **mdata) 569 { 570 ns_mod *mod; 571 ns_mtab *match, key; 572 int i; 573 574 if (disp_tab != NULL) 575 for (i = 0; disp_tab[i].src != NULL; i++) 576 if (strcasecmp(source, disp_tab[i].src) == 0) { 577 *mdata = disp_tab[i].mdata; 578 return (disp_tab[i].method); 579 } 580 mod = vector_search(&source, _nsmod, _nsmodsize, sizeof(*_nsmod), 581 string_compare); 582 if (mod != NULL && mod->handle != NULL) { 583 key.database = database; 584 key.name = method; 585 match = bsearch(&key, mod->mtab, mod->mtabsize, 586 sizeof(mod->mtab[0]), mtab_compare); 587 if (match != NULL) { 588 *mdata = match->mdata; 589 return (match->method); 590 } 591 } 592 593 *mdata = NULL; 594 return (NULL); 595 } 596 597 static void 598 fb_endstate(void *p) 599 { 600 free(p); 601 } 602 603 __weak_reference(_nsdispatch, nsdispatch); 604 605 int 606 _nsdispatch(void *retval, const ns_dtab disp_tab[], const char *database, 607 const char *method_name, const ns_src defaults[], ...) 608 { 609 va_list ap; 610 const ns_dbt *dbt; 611 const ns_src *srclist; 612 nss_method method, fb_method; 613 void *mdata; 614 int isthreaded, serrno, i, result, srclistsize; 615 struct fb_state *st; 616 617 #ifdef NS_CACHING 618 nss_cache_data cache_data; 619 nss_cache_data *cache_data_p; 620 int cache_flag; 621 #endif 622 623 dbt = NULL; 624 fb_method = NULL; 625 626 isthreaded = __isthreaded; 627 serrno = errno; 628 if (isthreaded) { 629 result = _pthread_rwlock_rdlock(&nss_lock); 630 if (result != 0) { 631 result = NS_UNAVAIL; 632 goto fin; 633 } 634 } 635 636 result = fb_getstate(&st); 637 if (result != 0) { 638 result = NS_UNAVAIL; 639 goto fin; 640 } 641 642 result = nss_configure(); 643 if (result != 0) { 644 result = NS_UNAVAIL; 645 goto fin; 646 } 647 if (st->fb_dispatch == 0) { 648 dbt = vector_search(&database, _nsmap, _nsmapsize, sizeof(*_nsmap), 649 string_compare); 650 fb_method = nss_method_lookup(NSSRC_FALLBACK, database, 651 method_name, disp_tab, &mdata); 652 } 653 654 if (dbt != NULL) { 655 srclist = dbt->srclist; 656 srclistsize = dbt->srclistsize; 657 } else { 658 srclist = defaults; 659 srclistsize = 0; 660 while (srclist[srclistsize].name != NULL) 661 srclistsize++; 662 } 663 664 #ifdef NS_CACHING 665 cache_data_p = NULL; 666 cache_flag = 0; 667 #endif 668 for (i = 0; i < srclistsize; i++) { 669 result = NS_NOTFOUND; 670 method = nss_method_lookup(srclist[i].name, database, 671 method_name, disp_tab, &mdata); 672 673 if (method != NULL) { 674 #ifdef NS_CACHING 675 if (strcmp(srclist[i].name, NSSRC_CACHE) == 0 && 676 nss_cache_cycle_prevention_func == NULL) { 677 #ifdef NS_STRICT_LIBC_EID_CHECKING 678 if (issetugid() != 0) 679 continue; 680 #endif 681 cache_flag = 1; 682 683 memset(&cache_data, 0, sizeof(nss_cache_data)); 684 cache_data.info = (nss_cache_info const *)mdata; 685 cache_data_p = &cache_data; 686 687 va_start(ap, defaults); 688 if (cache_data.info->id_func != NULL) 689 result = __nss_common_cache_read(retval, 690 cache_data_p, ap); 691 else if (cache_data.info->marshal_func != NULL) 692 result = __nss_mp_cache_read(retval, 693 cache_data_p, ap); 694 else 695 result = __nss_mp_cache_end(retval, 696 cache_data_p, ap); 697 va_end(ap); 698 } else { 699 cache_flag = 0; 700 errno = 0; 701 va_start(ap, defaults); 702 result = method(retval, mdata, ap); 703 va_end(ap); 704 } 705 #else /* NS_CACHING */ 706 errno = 0; 707 va_start(ap, defaults); 708 result = method(retval, mdata, ap); 709 va_end(ap); 710 #endif /* NS_CACHING */ 711 712 if (result & (srclist[i].flags)) 713 break; 714 } else { 715 if (fb_method != NULL) { 716 st->fb_dispatch = 1; 717 va_start(ap, defaults); 718 result = fb_method(retval, 719 (void *)srclist[i].name, ap); 720 va_end(ap); 721 st->fb_dispatch = 0; 722 } else 723 nss_log(LOG_DEBUG, "%s, %s, %s, not found, " 724 "and no fallback provided", 725 srclist[i].name, database, method_name); 726 } 727 } 728 729 #ifdef NS_CACHING 730 if (cache_data_p != NULL && 731 (result & (NS_NOTFOUND | NS_SUCCESS)) && cache_flag == 0) { 732 va_start(ap, defaults); 733 if (result == NS_SUCCESS) { 734 if (cache_data.info->id_func != NULL) 735 __nss_common_cache_write(retval, cache_data_p, 736 ap); 737 else if (cache_data.info->marshal_func != NULL) 738 __nss_mp_cache_write(retval, cache_data_p, ap); 739 } else if (result == NS_NOTFOUND) { 740 if (cache_data.info->id_func == NULL) { 741 if (cache_data.info->marshal_func != NULL) 742 __nss_mp_cache_write_submit(retval, 743 cache_data_p, ap); 744 } else 745 __nss_common_cache_write_negative(cache_data_p); 746 } 747 va_end(ap); 748 } 749 #endif /* NS_CACHING */ 750 751 if (isthreaded) 752 (void)_pthread_rwlock_unlock(&nss_lock); 753 fin: 754 errno = serrno; 755 return (result); 756 } 757