lib/libc/gen/getgrent.c

   1 /*-
   2  * Copyright (c) 2003 Networks Associates Technology, Inc.
   3  * All rights reserved.
   4  *
   5  * This software was developed for the FreeBSD Project by
   6  * Jacques A. Vidrine, Safeport Network Services, and Network
   7  * Associates Laboratories, the Security Research Division of Network
   8  * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035
   9  * ("CBOSS"), as part of the DARPA CHATS research program.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  */
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35
  36 #include "namespace.h"
  37 #include <sys/param.h>
  38 #ifdef YP
  39 #include <rpc/rpc.h>
  40 #include <rpcsvc/yp_prot.h>
  41 #include <rpcsvc/ypclnt.h>
  42 #endif
  43 #include <assert.h>
  44 #include <ctype.h>
  45 #include <errno.h>
  46 #ifdef HESIOD
  47 #include <hesiod.h>
  48 #endif
  49 #include <grp.h>
  50 #include <nsswitch.h>
  51 #include <pthread.h>
  52 #include <pthread_np.h>
  53 #include <stdio.h>
  54 #include <stdlib.h>
  55 #include <string.h>
  56 #include <syslog.h>
  57 #include <unistd.h>
  58 #include "un-namespace.h"
  59 #include "libc_private.h"
  60 #include "nss_tls.h"
  61 #ifdef NS_CACHING
  62 #include "nscache.h"
  63 #endif
  64
  65 enum constants {
  66         GRP_STORAGE_INITIAL     = 1 << 10, /* 1 KByte */
  67         GRP_STORAGE_MAX         = 1 << 20, /* 1 MByte */
  68         SETGRENT                = 1,
  69         ENDGRENT                = 2,
  70         HESIOD_NAME_MAX         = 256,
  71 };
  72
  73 static const ns_src defaultsrc[] = {
  74         { NSSRC_COMPAT, NS_SUCCESS },
  75         { NULL, 0 }
  76 };
  77
  78 int      __gr_match_entry(const char *, size_t, enum nss_lookup_type,
  79             const char *, gid_t);
  80 int      __gr_parse_entry(char *, size_t, struct group *, char *, size_t,
  81             int *);
  82
  83 static  int      is_comment_line(const char *, size_t);
  84
  85 union key {
  86         const char      *name;
  87         gid_t            gid;
  88 };
  89 static  struct group *getgr(int (*)(union key, struct group *, char *, size_t,
  90                     struct group **), union key);
  91 static  int      wrap_getgrnam_r(union key, struct group *, char *, size_t,
  92                     struct group **);
  93 static  int      wrap_getgrgid_r(union key, struct group *, char *, size_t,
  94                     struct group **);
  95 static  int      wrap_getgrent_r(union key, struct group *, char *, size_t,
  96                     struct group **);
  97
  98 struct files_state {
  99         FILE    *fp;
 100         int      stayopen;
 101 };
 102 static  void     files_endstate(void *);
 103 NSS_TLS_HANDLING(files);
 104 static  int      files_setgrent(void *, void *, va_list);
 105 static  int      files_group(void *, void *, va_list);
 106
 107
 108 #ifdef HESIOD
 109 struct dns_state {
 110         long    counter;
 111 };
 112 static  void     dns_endstate(void *);
 113 NSS_TLS_HANDLING(dns);
 114 static  int      dns_setgrent(void *, void *, va_list);
 115 static  int      dns_group(void *, void *, va_list);
 116 #endif
 117
 118
 119 #ifdef YP
 120 struct nis_state {
 121         char     domain[MAXHOSTNAMELEN];
 122         int      done;
 123         char    *key;
 124         int      keylen;
 125 };
 126 static  void     nis_endstate(void *);
 127 NSS_TLS_HANDLING(nis);
 128 static  int      nis_setgrent(void *, void *, va_list);
 129 static  int      nis_group(void *, void *, va_list);
 130 #endif
 131
 132 struct compat_state {
 133         FILE    *fp;
 134         int      stayopen;
 135         char    *name;
 136         enum _compat {
 137                 COMPAT_MODE_OFF = 0,
 138                 COMPAT_MODE_ALL,
 139                 COMPAT_MODE_NAME
 140         }        compat;
 141 };
 142 static  void     compat_endstate(void *);
 143 NSS_TLS_HANDLING(compat);
 144 static  int      compat_setgrent(void *, void *, va_list);
 145 static  int      compat_group(void *, void *, va_list);
 146
 147 static  int     gr_addgid(gid_t, gid_t *, int, int *);
 148 static  int     getgroupmembership_fallback(void *, void *, va_list);
 149
 150 #ifdef NS_CACHING
 151 static  int      grp_id_func(char *, size_t *, va_list, void *);
 152 static  int      grp_marshal_func(char *, size_t *, void *, va_list, void *);
 153 static  int      grp_unmarshal_func(char *, size_t, void *, va_list, void *);
 154
 155 static int
 156 grp_id_func(char *buffer, size_t *buffer_size, va_list ap, void *cache_mdata)
 157 {
 158         char    *name;
 159         gid_t   gid;
 160
 161         size_t  desired_size, size;
 162         int     res = NS_UNAVAIL;
 163         enum nss_lookup_type lookup_type;
 164
 165
 166         lookup_type = (enum nss_lookup_type)cache_mdata;
 167         switch (lookup_type) {
 168         case nss_lt_name:
 169                 name = va_arg(ap, char *);
 170                 size = strlen(name);
 171                 desired_size = sizeof(enum nss_lookup_type) + size + 1;
 172                 if (desired_size > *buffer_size) {
 173                         res = NS_RETURN;
 174                         goto fin;
 175                 }
 176
 177                 memcpy(buffer, &lookup_type, sizeof(enum nss_lookup_type));
 178                 memcpy(buffer + sizeof(enum nss_lookup_type), name, size + 1);
 179
 180                 res = NS_SUCCESS;
 181                 break;
 182         case nss_lt_id:
 183                 gid = va_arg(ap, gid_t);
 184                 desired_size = sizeof(enum nss_lookup_type) + sizeof(gid_t);
 185                 if (desired_size > *buffer_size) {
 186                         res = NS_RETURN;
 187                         goto fin;
 188                 }
 189
 190                 memcpy(buffer, &lookup_type, sizeof(enum nss_lookup_type));
 191                 memcpy(buffer + sizeof(enum nss_lookup_type), &gid,
 192                     sizeof(gid_t));
 193
 194                 res = NS_SUCCESS;
 195                 break;
 196         default:
 197                 /* should be unreachable */
 198                 return (NS_UNAVAIL);
 199         }
 200
 201 fin:
 202         *buffer_size = desired_size;
 203         return (res);
 204 }
 205
 206 static int
 207 grp_marshal_func(char *buffer, size_t *buffer_size, void *retval, va_list ap,
 208     void *cache_mdata)
 209 {
 210         char *name;
 211         gid_t gid;
 212         struct group *grp;
 213         char *orig_buf;
 214         size_t orig_buf_size;
 215
 216         struct group new_grp;
 217         size_t desired_size, size, mem_size;
 218         char *p, **mem;
 219
 220         switch ((enum nss_lookup_type)cache_mdata) {
 221         case nss_lt_name:
 222                 name = va_arg(ap, char *);
 223                 break;
 224         case nss_lt_id:
 225                 gid = va_arg(ap, gid_t);
 226                 break;
 227         case nss_lt_all:
 228                 break;
 229         default:
 230                 /* should be unreachable */
 231                 return (NS_UNAVAIL);
 232         }
 233
 234         grp = va_arg(ap, struct group *);
 235         orig_buf = va_arg(ap, char *);
 236         orig_buf_size = va_arg(ap, size_t);
 237
 238         desired_size = _ALIGNBYTES + sizeof(struct group) + sizeof(char *);
 239
 240         if (grp->gr_name != NULL)
 241                 desired_size += strlen(grp->gr_name) + 1;
 242         if (grp->gr_passwd != NULL)
 243                 desired_size += strlen(grp->gr_passwd) + 1;
 244
 245         if (grp->gr_mem != NULL) {
 246                 mem_size = 0;
 247                 for (mem = grp->gr_mem; *mem; ++mem) {
 248                         desired_size += strlen(*mem) + 1;
 249                         ++mem_size;
 250                 }
 251
 252                 desired_size += _ALIGNBYTES + (mem_size + 1) * sizeof(char *);
 253         }
 254
 255         if (desired_size > *buffer_size) {
 256                 /* this assignment is here for future use */
 257                 *buffer_size = desired_size;
 258                 return (NS_RETURN);
 259         }
 260
 261         memcpy(&new_grp, grp, sizeof(struct group));
 262         memset(buffer, 0, desired_size);
 263
 264         *buffer_size = desired_size;
 265         p = buffer + sizeof(struct group) + sizeof(char *);
 266         memcpy(buffer + sizeof(struct group), &p, sizeof(char *));
 267         p = (char *)_ALIGN(p);
 268
 269         if (new_grp.gr_name != NULL) {
 270                 size = strlen(new_grp.gr_name);
 271                 memcpy(p, new_grp.gr_name, size);
 272                 new_grp.gr_name = p;
 273                 p += size + 1;
 274         }
 275
 276         if (new_grp.gr_passwd != NULL) {
 277                 size = strlen(new_grp.gr_passwd);
 278                 memcpy(p, new_grp.gr_passwd, size);
 279                 new_grp.gr_passwd = p;
 280                 p += size + 1;
 281         }
 282
 283         if (new_grp.gr_mem != NULL) {
 284                 p = (char *)_ALIGN(p);
 285                 memcpy(p, new_grp.gr_mem, sizeof(char *) * mem_size);
 286                 new_grp.gr_mem = (char **)p;
 287                 p += sizeof(char *) * (mem_size + 1);
 288
 289                 for (mem = new_grp.gr_mem; *mem; ++mem) {
 290                         size = strlen(*mem);
 291                         memcpy(p, *mem, size);
 292                         *mem = p;
 293                         p += size + 1;
 294                 }
 295         }
 296
 297         memcpy(buffer, &new_grp, sizeof(struct group));
 298         return (NS_SUCCESS);
 299 }
 300
 301 static int
 302 grp_unmarshal_func(char *buffer, size_t buffer_size, void *retval, va_list ap,
 303     void *cache_mdata)
 304 {
 305         char *name;
 306         gid_t gid;
 307         struct group *grp;
 308         char *orig_buf;
 309         size_t orig_buf_size;
 310         int *ret_errno;
 311
 312         char *p;
 313         char **mem;
 314
 315         switch ((enum nss_lookup_type)cache_mdata) {
 316         case nss_lt_name:
 317                 name = va_arg(ap, char *);
 318                 break;
 319         case nss_lt_id:
 320                 gid = va_arg(ap, gid_t);
 321                 break;
 322         case nss_lt_all:
 323                 break;
 324         default:
 325                 /* should be unreachable */
 326                 return (NS_UNAVAIL);
 327         }
 328
 329         grp = va_arg(ap, struct group *);
 330         orig_buf = va_arg(ap, char *);
 331         orig_buf_size = va_arg(ap, size_t);
 332         ret_errno = va_arg(ap, int *);
 333
 334         if (orig_buf_size <
 335             buffer_size - sizeof(struct group) - sizeof(char *)) {
 336                 *ret_errno = ERANGE;
 337                 return (NS_RETURN);
 338         }
 339
 340         memcpy(grp, buffer, sizeof(struct group));
 341         memcpy(&p, buffer + sizeof(struct group), sizeof(char *));
 342
 343         orig_buf = (char *)_ALIGN(orig_buf);
 344         memcpy(orig_buf, buffer + sizeof(struct group) + sizeof(char *) +
 345             _ALIGN(p) - (size_t)p,
 346             buffer_size - sizeof(struct group) - sizeof(char *) -
 347             _ALIGN(p) + (size_t)p);
 348         p = (char *)_ALIGN(p);
 349
 350         NS_APPLY_OFFSET(grp->gr_name, orig_buf, p, char *);
 351         NS_APPLY_OFFSET(grp->gr_passwd, orig_buf, p, char *);
 352         if (grp->gr_mem != NULL) {
 353                 NS_APPLY_OFFSET(grp->gr_mem, orig_buf, p, char **);
 354
 355                 for (mem = grp->gr_mem; *mem; ++mem)
 356                         NS_APPLY_OFFSET(*mem, orig_buf, p, char *);
 357         }
 358
 359         if (retval != NULL)
 360                 *((struct group **)retval) = grp;
 361
 362         return (NS_SUCCESS);
 363 }
 364
 365 NSS_MP_CACHE_HANDLING(group);
 366 #endif /* NS_CACHING */
 367
 368 #ifdef NS_CACHING
 369 static const nss_cache_info setgrent_cache_info = NS_MP_CACHE_INFO_INITIALIZER(
 370         group, (void *)nss_lt_all,
 371         NULL, NULL);
 372 #endif
 373
 374 static const ns_dtab setgrent_dtab[] = {
 375         { NSSRC_FILES, files_setgrent, (void *)SETGRENT },
 376 #ifdef HESIOD
 377         { NSSRC_DNS, dns_setgrent, (void *)SETGRENT },
 378 #endif
 379 #ifdef YP
 380         { NSSRC_NIS, nis_setgrent, (void *)SETGRENT },
 381 #endif
 382         { NSSRC_COMPAT, compat_setgrent, (void *)SETGRENT },
 383 #ifdef NS_CACHING
 384         NS_CACHE_CB(&setgrent_cache_info)
 385 #endif
 386         { NULL, NULL, NULL }
 387 };
 388
 389 #ifdef NS_CACHING
 390 static const nss_cache_info endgrent_cache_info = NS_MP_CACHE_INFO_INITIALIZER(
 391         group, (void *)nss_lt_all,
 392         NULL, NULL);
 393 #endif
 394
 395 static const ns_dtab endgrent_dtab[] = {
 396         { NSSRC_FILES, files_setgrent, (void *)ENDGRENT },
 397 #ifdef HESIOD
 398         { NSSRC_DNS, dns_setgrent, (void *)ENDGRENT },
 399 #endif
 400 #ifdef YP
 401         { NSSRC_NIS, nis_setgrent, (void *)ENDGRENT },
 402 #endif
 403         { NSSRC_COMPAT, compat_setgrent, (void *)ENDGRENT },
 404 #ifdef NS_CACHING
 405         NS_CACHE_CB(&endgrent_cache_info)
 406 #endif
 407         { NULL, NULL, NULL }
 408 };
 409
 410 #ifdef NS_CACHING
 411 static const nss_cache_info getgrent_r_cache_info = NS_MP_CACHE_INFO_INITIALIZER(
 412         group, (void *)nss_lt_all,
 413         grp_marshal_func, grp_unmarshal_func);
 414 #endif
 415
 416 static const ns_dtab getgrent_r_dtab[] = {
 417         { NSSRC_FILES, files_group, (void *)nss_lt_all },
 418 #ifdef HESIOD
 419         { NSSRC_DNS, dns_group, (void *)nss_lt_all },
 420 #endif
 421 #ifdef YP
 422         { NSSRC_NIS, nis_group, (void *)nss_lt_all },
 423 #endif
 424         { NSSRC_COMPAT, compat_group, (void *)nss_lt_all },
 425 #ifdef NS_CACHING
 426         NS_CACHE_CB(&getgrent_r_cache_info)
 427 #endif
 428         { NULL, NULL, NULL }
 429 };
 430
 431 static int
 432 gr_addgid(gid_t gid, gid_t *groups, int maxgrp, int *grpcnt)
 433 {
 434         int     ret, dupc;
 435
 436         for (dupc = 0; dupc < MIN(maxgrp, *grpcnt); dupc++) {
 437                 if (groups[dupc] == gid)
 438                         return 1;
 439         }
 440
 441         ret = 1;
 442         if (*grpcnt < maxgrp)
 443                 groups[*grpcnt] = gid;
 444         else
 445                 ret = 0;
 446
 447         (*grpcnt)++;
 448
 449         return ret;
 450 }
 451
 452 static int
 453 getgroupmembership_fallback(void *retval, void *mdata, va_list ap)
 454 {
 455         const ns_src src[] = {
 456                 { mdata, NS_SUCCESS },
 457                 { NULL, 0}
 458         };
 459         struct group    grp;
 460         struct group    *grp_p;
 461         char            *buf;
 462         size_t          bufsize;
 463         const char      *uname;
 464         gid_t           *groups;
 465         gid_t           agroup;
 466         int             maxgrp, *grpcnt;
 467         int             i, rv, ret_errno;
 468
 469         /*
 470          * As this is a fallback method, only provided src
 471          * list will be respected during methods search.
 472          */
 473         assert(src[0].name != NULL);
 474
 475         uname = va_arg(ap, const char *);
 476         agroup = va_arg(ap, gid_t);
 477         groups = va_arg(ap, gid_t *);
 478         maxgrp = va_arg(ap, int);
 479         grpcnt = va_arg(ap, int *);
 480
 481         rv = NS_UNAVAIL;
 482
 483         buf = malloc(GRP_STORAGE_INITIAL);
 484         if (buf == NULL)
 485                 goto out;
 486
 487         bufsize = GRP_STORAGE_INITIAL;
 488
 489         gr_addgid(agroup, groups, maxgrp, grpcnt);
 490
 491         _nsdispatch(NULL, setgrent_dtab, NSDB_GROUP, "setgrent", src, 0);
 492         for (;;) {
 493                 do {
 494                         ret_errno = 0;
 495                         grp_p = NULL;
 496                         rv = _nsdispatch(&grp_p, getgrent_r_dtab, NSDB_GROUP,
 497                             "getgrent_r", src, &grp, buf, bufsize, &ret_errno);
 498
 499                         if (grp_p == NULL && ret_errno == ERANGE) {
 500                                 free(buf);
 501                                 if ((bufsize << 1) > GRP_STORAGE_MAX) {
 502                                         buf = NULL;
 503                                         errno = ERANGE;
 504                                         goto out;
 505                                 }
 506
 507                                 bufsize <<= 1;
 508                                 buf = malloc(bufsize);
 509                                 if (buf == NULL) {
 510                                         goto out;
 511                                 }
 512                         }
 513                 } while (grp_p == NULL && ret_errno == ERANGE);
 514
 515                 if (ret_errno != 0) {
 516                         errno = ret_errno;
 517                         goto out;
 518                 }
 519
 520                 if (grp_p == NULL)
 521                         break;
 522
 523                 for (i = 0; grp.gr_mem[i]; i++) {
 524                         if (strcmp(grp.gr_mem[i], uname) == 0)
 525                             gr_addgid(grp.gr_gid, groups, maxgrp, grpcnt);
 526                 }
 527         }
 528
 529         _nsdispatch(NULL, endgrent_dtab, NSDB_GROUP, "endgrent", src);
 530 out:
 531         free(buf);
 532         return (rv);
 533 }
 534
 535 /* XXX IEEE Std 1003.1, 2003 specifies `void setgrent(void)' */
 536 int
 537 setgrent(void)
 538 {
 539         (void)_nsdispatch(NULL, setgrent_dtab, NSDB_GROUP, "setgrent", defaultsrc, 0);
 540         return (1);
 541 }
 542
 543
 544 int
 545 setgroupent(int stayopen)
 546 {
 547         (void)_nsdispatch(NULL, setgrent_dtab, NSDB_GROUP, "setgrent", defaultsrc,
 548             stayopen);
 549         return (1);
 550 }
 551
 552
 553 void
 554 endgrent(void)
 555 {
 556         (void)_nsdispatch(NULL, endgrent_dtab, NSDB_GROUP, "endgrent", defaultsrc);
 557 }
 558
 559
 560 int
 561 getgrent_r(struct group *grp, char *buffer, size_t bufsize,
 562     struct group **result)
 563 {
 564         int     rv, ret_errno;
 565
 566         ret_errno = 0;
 567         *result = NULL;
 568         rv = _nsdispatch(result, getgrent_r_dtab, NSDB_GROUP, "getgrent_r", defaultsrc,
 569             grp, buffer, bufsize, &ret_errno);
 570         if (rv == NS_SUCCESS)
 571                 return (0);
 572         else
 573                 return (ret_errno);
 574 }
 575
 576
 577 int
 578 getgrnam_r(const char *name, struct group *grp, char *buffer, size_t bufsize,
 579     struct group **result)
 580 {
 581 #ifdef NS_CACHING
 582         static const nss_cache_info cache_info =
 583                 NS_COMMON_CACHE_INFO_INITIALIZER(
 584                 group, (void *)nss_lt_name,
 585                 grp_id_func, grp_marshal_func, grp_unmarshal_func);
 586 #endif
 587
 588         static const ns_dtab dtab[] = {
 589                 { NSSRC_FILES, files_group, (void *)nss_lt_name },
 590 #ifdef HESIOD
 591                 { NSSRC_DNS, dns_group, (void *)nss_lt_name },
 592 #endif
 593 #ifdef YP
 594                 { NSSRC_NIS, nis_group, (void *)nss_lt_name },
 595 #endif
 596                 { NSSRC_COMPAT, compat_group, (void *)nss_lt_name },
 597 #ifdef NS_CACHING
 598                 NS_CACHE_CB(&cache_info)
 599 #endif
 600                 { NULL, NULL, NULL }
 601         };
 602         int     rv, ret_errno;
 603
 604         ret_errno = 0;
 605         *result = NULL;
 606         rv = _nsdispatch(result, dtab, NSDB_GROUP, "getgrnam_r", defaultsrc,
 607             name, grp, buffer, bufsize, &ret_errno);
 608         if (rv == NS_SUCCESS)
 609                 return (0);
 610         else
 611                 return (ret_errno);
 612 }
 613
 614
 615 int
 616 getgrgid_r(gid_t gid, struct group *grp, char *buffer, size_t bufsize,
 617     struct group **result)
 618 {
 619 #ifdef NS_CACHING
 620         static const nss_cache_info cache_info =
 621                 NS_COMMON_CACHE_INFO_INITIALIZER(
 622                 group, (void *)nss_lt_id,
 623                 grp_id_func, grp_marshal_func, grp_unmarshal_func);
 624 #endif
 625
 626         static const ns_dtab dtab[] = {
 627                 { NSSRC_FILES, files_group, (void *)nss_lt_id },
 628 #ifdef HESIOD
 629                 { NSSRC_DNS, dns_group, (void *)nss_lt_id },
 630 #endif
 631 #ifdef YP
 632                 { NSSRC_NIS, nis_group, (void *)nss_lt_id },
 633 #endif
 634                 { NSSRC_COMPAT, compat_group, (void *)nss_lt_id },
 635 #ifdef NS_CACHING
 636                 NS_CACHE_CB(&cache_info)
 637 #endif
 638                 { NULL, NULL, NULL }
 639         };
 640         int     rv, ret_errno;
 641
 642         ret_errno = 0;
 643         *result = NULL;
 644         rv = _nsdispatch(result, dtab, NSDB_GROUP, "getgrgid_r", defaultsrc,
 645             gid, grp, buffer, bufsize, &ret_errno);
 646         if (rv == NS_SUCCESS)
 647                 return (0);
 648         else
 649                 return (ret_errno);
 650 }
 651
 652
 653
 654 int
 655 __getgroupmembership(const char *uname, gid_t agroup, gid_t *groups,
 656         int maxgrp, int *grpcnt)
 657 {
 658         static const ns_dtab dtab[] = {
 659                 NS_FALLBACK_CB(getgroupmembership_fallback)
 660                 { NULL, NULL, NULL }
 661         };
 662         int rv;
 663
 664         assert(uname != NULL);
 665         /* groups may be NULL if just sizing when invoked with maxgrp = 0 */
 666         assert(grpcnt != NULL);
 667
 668         *grpcnt = 0;
 669         rv = _nsdispatch(NULL, dtab, NSDB_GROUP, "getgroupmembership",
 670             defaultsrc, uname, agroup, groups, maxgrp, grpcnt);
 671
 672         /* too many groups found? */
 673         return (*grpcnt > maxgrp ? -1 : 0);
 674 }
 675
 676
 677 static struct group      grp;
 678 static char             *grp_storage;
 679 static size_t            grp_storage_size;
 680
 681 static struct group *
 682 getgr(int (*fn)(union key, struct group *, char *, size_t, struct group **),
 683     union key key)
 684 {
 685         int              rv;
 686         struct group    *res;
 687
 688         if (grp_storage == NULL) {
 689                 grp_storage = malloc(GRP_STORAGE_INITIAL);
 690                 if (grp_storage == NULL)
 691                         return (NULL);
 692                 grp_storage_size = GRP_STORAGE_INITIAL;
 693         }
 694         do {
 695                 rv = fn(key, &grp, grp_storage, grp_storage_size, &res);
 696                 if (res == NULL && rv == ERANGE) {
 697                         free(grp_storage);
 698                         if ((grp_storage_size << 1) > GRP_STORAGE_MAX) {
 699                                 grp_storage = NULL;
 700                                 errno = ERANGE;
 701                                 return (NULL);
 702                         }
 703                         grp_storage_size <<= 1;
 704                         grp_storage = malloc(grp_storage_size);
 705                         if (grp_storage == NULL)
 706                                 return (NULL);
 707                 }
 708         } while (res == NULL && rv == ERANGE);
 709         if (rv != 0)
 710                 errno = rv;
 711         return (res);
 712 }
 713
 714
 715 static int
 716 wrap_getgrnam_r(union key key, struct group *grp, char *buffer, size_t bufsize,
 717     struct group **res)
 718 {
 719         return (getgrnam_r(key.name, grp, buffer, bufsize, res));
 720 }
 721
 722
 723 static int
 724 wrap_getgrgid_r(union key key, struct group *grp, char *buffer, size_t bufsize,
 725     struct group **res)
 726 {
 727         return (getgrgid_r(key.gid, grp, buffer, bufsize, res));
 728 }
 729
 730
 731 static int
 732 wrap_getgrent_r(union key key __unused, struct group *grp, char *buffer,
 733     size_t bufsize, struct group **res)
 734 {
 735         return (getgrent_r(grp, buffer, bufsize, res));
 736 }
 737
 738
 739 struct group *
 740 getgrnam(const char *name)
 741 {
 742         union key key;
 743
 744         key.name = name;
 745         return (getgr(wrap_getgrnam_r, key));
 746 }
 747
 748
 749 struct group *
 750 getgrgid(gid_t gid)
 751 {
 752         union key key;
 753
 754         key.gid = gid;
 755         return (getgr(wrap_getgrgid_r, key));
 756 }
 757
 758
 759 struct group *
 760 getgrent(void)
 761 {
 762         union key key;
 763
 764         key.gid = 0; /* not used */
 765         return (getgr(wrap_getgrent_r, key));
 766 }
 767
 768
 769 static int
 770 is_comment_line(const char *s, size_t n)
 771 {
 772         const char      *eom;
 773
 774         eom = &s[n];
 775
 776         for (; s < eom; s++)
 777                 if (*s == '#' || !isspace((unsigned char)*s))
 778                         break;
 779         return (*s == '#' || s == eom);
 780 }
 781
 782
 783 /*
 784  * files backend
 785  */
 786 static void
 787 files_endstate(void *p)
 788 {
 789
 790         if (p == NULL)
 791                 return;
 792         if (((struct files_state *)p)->fp != NULL)
 793                 fclose(((struct files_state *)p)->fp);
 794         free(p);
 795 }
 796
 797
 798 static int
 799 files_setgrent(void *retval, void *mdata, va_list ap)
 800 {
 801         struct files_state *st;
 802         int              rv, stayopen;
 803
 804         rv = files_getstate(&st);
 805         if (rv != 0)
 806                 return (NS_UNAVAIL);
 807         switch ((enum constants)mdata) {
 808         case SETGRENT:
 809                 stayopen = va_arg(ap, int);
 810                 if (st->fp != NULL)
 811                         rewind(st->fp);
 812                 else if (stayopen)
 813                         st->fp = fopen(_PATH_GROUP, "re");
 814                 break;
 815         case ENDGRENT:
 816                 if (st->fp != NULL) {
 817                         fclose(st->fp);
 818                         st->fp = NULL;
 819                 }
 820                 break;
 821         default:
 822                 break;
 823         }
 824         return (NS_UNAVAIL);
 825 }
 826
 827
 828 static int
 829 files_group(void *retval, void *mdata, va_list ap)
 830 {
 831         struct files_state      *st;
 832         enum nss_lookup_type     how;
 833         const char              *name, *line;
 834         struct group            *grp;
 835         gid_t                    gid;
 836         char                    *buffer;
 837         size_t                   bufsize, linesize;
 838         off_t                    pos;
 839         int                      rv, stayopen, *errnop;
 840
 841         name = NULL;
 842         gid = (gid_t)-1;
 843         how = (enum nss_lookup_type)mdata;
 844         switch (how) {
 845         case nss_lt_name:
 846                 name = va_arg(ap, const char *);
 847                 break;
 848         case nss_lt_id:
 849                 gid = va_arg(ap, gid_t);
 850                 break;
 851         case nss_lt_all:
 852                 break;
 853         default:
 854                 return (NS_NOTFOUND);
 855         }
 856         grp = va_arg(ap, struct group *);
 857         buffer = va_arg(ap, char *);
 858         bufsize = va_arg(ap, size_t);
 859         errnop = va_arg(ap, int *);
 860         *errnop = files_getstate(&st);
 861         if (*errnop != 0)
 862                 return (NS_UNAVAIL);
 863         if (st->fp == NULL &&
 864             ((st->fp = fopen(_PATH_GROUP, "re")) == NULL)) {
 865                 *errnop = errno;
 866                 return (NS_UNAVAIL);
 867         }
 868         if (how == nss_lt_all)
 869                 stayopen = 1;
 870         else {
 871                 rewind(st->fp);
 872                 stayopen = st->stayopen;
 873         }
 874         rv = NS_NOTFOUND;
 875         pos = ftello(st->fp);
 876         while ((line = fgetln(st->fp, &linesize)) != NULL) {
 877                 if (line[linesize-1] == '\n')
 878                         linesize--;
 879                 rv = __gr_match_entry(line, linesize, how, name, gid);
 880                 if (rv != NS_SUCCESS)
 881                         continue;
 882                 /* We need room at least for the line, a string NUL
 883                  * terminator, alignment padding, and one (char *)
 884                  * pointer for the member list terminator.
 885                  */
 886                 if (bufsize <= linesize + _ALIGNBYTES + sizeof(char *)) {
 887                         *errnop = ERANGE;
 888                         rv = NS_RETURN;
 889                         break;
 890                 }
 891                 memcpy(buffer, line, linesize);
 892                 buffer[linesize] = '\0';
 893                 rv = __gr_parse_entry(buffer, linesize, grp,
 894                     &buffer[linesize + 1], bufsize - linesize - 1, errnop);
 895                 if (rv & NS_TERMINATE)
 896                         break;
 897                 pos = ftello(st->fp);
 898         }
 899         if (!stayopen && st->fp != NULL) {
 900                 fclose(st->fp);
 901                 st->fp = NULL;
 902         }
 903         if (rv == NS_SUCCESS && retval != NULL)
 904                 *(struct group **)retval = grp;
 905         else if (rv == NS_RETURN && *errnop == ERANGE && st->fp != NULL)
 906                 fseeko(st->fp, pos, SEEK_SET);
 907         return (rv);
 908 }
 909
 910
 911 #ifdef HESIOD
 912 /*
 913  * dns backend
 914  */
 915 static void
 916 dns_endstate(void *p)
 917 {
 918
 919         free(p);
 920 }
 921
 922
 923 static int
 924 dns_setgrent(void *retval, void *cb_data, va_list ap)
 925 {
 926         struct dns_state        *st;
 927         int                      rv;
 928
 929         rv = dns_getstate(&st);
 930         if (rv != 0)
 931                 return (NS_UNAVAIL);
 932         st->counter = 0;
 933         return (NS_UNAVAIL);
 934 }
 935
 936
 937 static int
 938 dns_group(void *retval, void *mdata, va_list ap)
 939 {
 940         char                     buf[HESIOD_NAME_MAX];
 941         struct dns_state        *st;
 942         struct group            *grp;
 943         const char              *name, *label;
 944         void                    *ctx;
 945         char                    *buffer, **hes;
 946         size_t                   bufsize, adjsize, linesize;
 947         gid_t                    gid;
 948         enum nss_lookup_type     how;
 949         int                      rv, *errnop;
 950
 951         ctx = NULL;
 952         hes = NULL;
 953         name = NULL;
 954         gid = (gid_t)-1;
 955         how = (enum nss_lookup_type)mdata;
 956         switch (how) {
 957         case nss_lt_name:
 958                 name = va_arg(ap, const char *);
 959                 break;
 960         case nss_lt_id:
 961                 gid = va_arg(ap, gid_t);
 962                 break;
 963         case nss_lt_all:
 964                 break;
 965         }
 966         grp     = va_arg(ap, struct group *);
 967         buffer  = va_arg(ap, char *);
 968         bufsize = va_arg(ap, size_t);
 969         errnop  = va_arg(ap, int *);
 970         *errnop = dns_getstate(&st);
 971         if (*errnop != 0)
 972                 return (NS_UNAVAIL);
 973         if (hesiod_init(&ctx) != 0) {
 974                 *errnop = errno;
 975                 rv = NS_UNAVAIL;
 976                 goto fin;
 977         }
 978         do {
 979                 rv = NS_NOTFOUND;
 980                 switch (how) {
 981                 case nss_lt_name:
 982                         label = name;
 983                         break;
 984                 case nss_lt_id:
 985                         if (snprintf(buf, sizeof(buf), "%lu",
 986                             (unsigned long)gid) >= sizeof(buf))
 987                                 goto fin;
 988                         label = buf;
 989                         break;
 990                 case nss_lt_all:
 991                         if (st->counter < 0)
 992                                 goto fin;
 993                         if (snprintf(buf, sizeof(buf), "group-%ld",
 994                             st->counter++) >= sizeof(buf))
 995                                 goto fin;
 996                         label = buf;
 997                         break;
 998                 }
 999                 hes = hesiod_resolve(ctx, label,
1000                     how == nss_lt_id ? "gid" : "group");
1001                 if ((how == nss_lt_id && hes == NULL &&
1002                     (hes = hesiod_resolve(ctx, buf, "group")) == NULL) ||
1003                     hes == NULL) {
1004                         if (how == nss_lt_all)
1005                                 st->counter = -1;
1006                         if (errno != ENOENT)
1007                                 *errnop = errno;
1008                         goto fin;
1009                 }
1010                 rv = __gr_match_entry(hes[0], strlen(hes[0]), how, name, gid);
1011                 if (rv != NS_SUCCESS) {
1012                         hesiod_free_list(ctx, hes);
1013                         hes = NULL;
1014                         continue;
1015                 }
1016                 /* We need room at least for the line, a string NUL
1017                  * terminator, alignment padding, and one (char *)
1018                  * pointer for the member list terminator.
1019                  */
1020                 adjsize = bufsize - _ALIGNBYTES - sizeof(char *);
1021                 linesize = strlcpy(buffer, hes[0], adjsize);
1022                 if (linesize >= adjsize) {
1023                         *errnop = ERANGE;
1024                         rv = NS_RETURN;
1025                         goto fin;
1026                 }
1027                 hesiod_free_list(ctx, hes);
1028                 hes = NULL;
1029                 rv = __gr_parse_entry(buffer, linesize, grp,
1030                     &buffer[linesize + 1], bufsize - linesize - 1, errnop);
1031         } while (how == nss_lt_all && !(rv & NS_TERMINATE));
1032 fin:
1033         if (hes != NULL)
1034                 hesiod_free_list(ctx, hes);
1035         if (ctx != NULL)
1036                 hesiod_end(ctx);
1037         if (rv == NS_SUCCESS && retval != NULL)
1038                 *(struct group **)retval = grp;
1039         return (rv);
1040 }
1041 #endif /* HESIOD */
1042
1043
1044 #ifdef YP
1045 /*
1046  * nis backend
1047  */
1048 static void
1049 nis_endstate(void *p)
1050 {
1051
1052         if (p == NULL)
1053                 return;
1054         free(((struct nis_state *)p)->key);
1055         free(p);
1056 }
1057
1058
1059 static int
1060 nis_setgrent(void *retval, void *cb_data, va_list ap)
1061 {
1062         struct nis_state        *st;
1063         int                      rv;
1064
1065         rv = nis_getstate(&st);
1066         if (rv != 0)
1067                 return (NS_UNAVAIL);
1068         st->done = 0;
1069         free(st->key);
1070         st->key = NULL;
1071         return (NS_UNAVAIL);
1072 }
1073
1074
1075 static int
1076 nis_group(void *retval, void *mdata, va_list ap)
1077 {
1078         char             *map;
1079         struct nis_state *st;
1080         struct group    *grp;
1081         const char      *name;
1082         char            *buffer, *key, *result;
1083         size_t           bufsize;
1084         gid_t            gid;
1085         enum nss_lookup_type how;
1086         int             *errnop, keylen, resultlen, rv;
1087
1088         name = NULL;
1089         gid = (gid_t)-1;
1090         how = (enum nss_lookup_type)mdata;
1091         switch (how) {
1092         case nss_lt_name:
1093                 name = va_arg(ap, const char *);
1094                 map = "group.byname";
1095                 break;
1096         case nss_lt_id:
1097                 gid = va_arg(ap, gid_t);
1098                 map = "group.bygid";
1099                 break;
1100         case nss_lt_all:
1101                 map = "group.byname";
1102                 break;
1103         }
1104         grp     = va_arg(ap, struct group *);
1105         buffer  = va_arg(ap, char *);
1106         bufsize = va_arg(ap, size_t);
1107         errnop  = va_arg(ap, int *);
1108         *errnop = nis_getstate(&st);
1109         if (*errnop != 0)
1110                 return (NS_UNAVAIL);
1111         if (st->domain[0] == '\0') {
1112                 if (getdomainname(st->domain, sizeof(st->domain)) != 0) {
1113                         *errnop = errno;
1114                         return (NS_UNAVAIL);
1115                 }
1116         }
1117         result = NULL;
1118         do {
1119                 rv = NS_NOTFOUND;
1120                 switch (how) {
1121                 case nss_lt_name:
1122                         if (strlcpy(buffer, name, bufsize) >= bufsize)
1123                                 goto erange;
1124                         break;
1125                 case nss_lt_id:
1126                         if (snprintf(buffer, bufsize, "%lu",
1127                             (unsigned long)gid) >= bufsize)
1128                                 goto erange;
1129                         break;
1130                 case nss_lt_all:
1131                         if (st->done)
1132                                 goto fin;
1133                         break;
1134                 }
1135                 result = NULL;
1136                 if (how == nss_lt_all) {
1137                         if (st->key == NULL)
1138                                 rv = yp_first(st->domain, map, &st->key,
1139                                     &st->keylen, &result, &resultlen);
1140                         else {
1141                                 key = st->key;
1142                                 keylen = st->keylen;
1143                                 st->key = NULL;
1144                                 rv = yp_next(st->domain, map, key, keylen,
1145                                     &st->key, &st->keylen, &result,
1146                                     &resultlen);
1147                                 free(key);
1148                         }
1149                         if (rv != 0) {
1150                                 free(result);
1151                                 free(st->key);
1152                                 st->key = NULL;
1153                                 if (rv == YPERR_NOMORE) {
1154                                         st->done = 1;
1155                                         rv = NS_NOTFOUND;
1156                                 } else
1157                                         rv = NS_UNAVAIL;
1158                                 goto fin;
1159                         }
1160                 } else {
1161                         rv = yp_match(st->domain, map, buffer, strlen(buffer),
1162                             &result, &resultlen);
1163                         if (rv == YPERR_KEY) {
1164                                 rv = NS_NOTFOUND;
1165                                 continue;
1166                         } else if (rv != 0) {
1167                                 free(result);
1168                                 rv = NS_UNAVAIL;
1169                                 continue;
1170                         }
1171                 }
1172                 /* We need room at least for the line, a string NUL
1173                  * terminator, alignment padding, and one (char *)
1174                  * pointer for the member list terminator.
1175                  */
1176                 if (resultlen >= bufsize - _ALIGNBYTES - sizeof(char *))
1177                         goto erange;
1178                 memcpy(buffer, result, resultlen);
1179                 buffer[resultlen] = '\0';
1180                 free(result);
1181                 rv = __gr_match_entry(buffer, resultlen, how, name, gid);
1182                 if (rv == NS_SUCCESS)
1183                         rv = __gr_parse_entry(buffer, resultlen, grp,
1184                             &buffer[resultlen+1], bufsize - resultlen - 1,
1185                             errnop);
1186         } while (how == nss_lt_all && !(rv & NS_TERMINATE));
1187 fin:
1188         if (rv == NS_SUCCESS && retval != NULL)
1189                 *(struct group **)retval = grp;
1190         return (rv);
1191 erange:
1192         *errnop = ERANGE;
1193         return (NS_RETURN);
1194 }
1195 #endif /* YP */
1196
1197
1198
1199 /*
1200  * compat backend
1201  */
1202 static void
1203 compat_endstate(void *p)
1204 {
1205         struct compat_state *st;
1206
1207         if (p == NULL)
1208                 return;
1209         st = (struct compat_state *)p;
1210         free(st->name);
1211         if (st->fp != NULL)
1212                 fclose(st->fp);
1213         free(p);
1214 }
1215
1216
1217 static int
1218 compat_setgrent(void *retval, void *mdata, va_list ap)
1219 {
1220         static const ns_src compatsrc[] = {
1221 #ifdef YP
1222                 { NSSRC_NIS, NS_SUCCESS },
1223 #endif
1224                 { NULL, 0 }
1225         };
1226         ns_dtab dtab[] = {
1227 #ifdef HESIOD
1228                 { NSSRC_DNS, dns_setgrent, NULL },
1229 #endif
1230 #ifdef YP
1231                 { NSSRC_NIS, nis_setgrent, NULL },
1232 #endif
1233                 { NULL, NULL, NULL }
1234         };
1235         struct compat_state *st;
1236         int              rv, stayopen;
1237
1238 #define set_setent(x, y) do {                                   \
1239         int i;                                                  \
1240                                                                 \
1241         for (i = 0; i < (sizeof(x)/sizeof(x[0])) - 1; i++)      \
1242                 x[i].mdata = (void *)y;                         \
1243 } while (0)
1244
1245         rv = compat_getstate(&st);
1246         if (rv != 0)
1247                 return (NS_UNAVAIL);
1248         switch ((enum constants)mdata) {
1249         case SETGRENT:
1250                 stayopen = va_arg(ap, int);
1251                 if (st->fp != NULL)
1252                         rewind(st->fp);
1253                 else if (stayopen)
1254                         st->fp = fopen(_PATH_GROUP, "re");
1255                 set_setent(dtab, mdata);
1256                 (void)_nsdispatch(NULL, dtab, NSDB_GROUP_COMPAT, "setgrent",
1257                     compatsrc, 0);
1258                 break;
1259         case ENDGRENT:
1260                 if (st->fp != NULL) {
1261                         fclose(st->fp);
1262                         st->fp = NULL;
1263                 }
1264                 set_setent(dtab, mdata);
1265                 (void)_nsdispatch(NULL, dtab, NSDB_GROUP_COMPAT, "endgrent",
1266                     compatsrc, 0);
1267                 break;
1268         default:
1269                 break;
1270         }
1271         st->compat = COMPAT_MODE_OFF;
1272         free(st->name);
1273         st->name = NULL;
1274         return (NS_UNAVAIL);
1275 #undef set_setent
1276 }
1277
1278
1279 static int
1280 compat_group(void *retval, void *mdata, va_list ap)
1281 {
1282         static const ns_src compatsrc[] = {
1283 #ifdef YP
1284                 { NSSRC_NIS, NS_SUCCESS },
1285 #endif
1286                 { NULL, 0 }
1287         };
1288         ns_dtab dtab[] = {
1289 #ifdef YP
1290                 { NSSRC_NIS, nis_group, NULL },
1291 #endif
1292 #ifdef HESIOD
1293                 { NSSRC_DNS, dns_group, NULL },
1294 #endif
1295                 { NULL, NULL, NULL }
1296         };
1297         struct compat_state     *st;
1298         enum nss_lookup_type     how;
1299         const char              *name, *line;
1300         struct group            *grp;
1301         gid_t                    gid;
1302         char                    *buffer, *p;
1303         void                    *discard;
1304         size_t                   bufsize, linesize;
1305         off_t                    pos;
1306         int                      rv, stayopen, *errnop;
1307
1308 #define set_lookup_type(x, y) do {                              \
1309         int i;                                                  \
1310                                                                 \
1311         for (i = 0; i < (sizeof(x)/sizeof(x[0])) - 1; i++)      \
1312                 x[i].mdata = (void *)y;                         \
1313 } while (0)
1314
1315         name = NULL;
1316         gid = (gid_t)-1;
1317         how = (enum nss_lookup_type)mdata;
1318         switch (how) {
1319         case nss_lt_name:
1320                 name = va_arg(ap, const char *);
1321                 break;
1322         case nss_lt_id:
1323                 gid = va_arg(ap, gid_t);
1324                 break;
1325         case nss_lt_all:
1326                 break;
1327         default:
1328                 return (NS_NOTFOUND);
1329         }
1330         grp = va_arg(ap, struct group *);
1331         buffer = va_arg(ap, char *);
1332         bufsize = va_arg(ap, size_t);
1333         errnop = va_arg(ap, int *);
1334         *errnop = compat_getstate(&st);
1335         if (*errnop != 0)
1336                 return (NS_UNAVAIL);
1337         if (st->fp == NULL &&
1338             ((st->fp = fopen(_PATH_GROUP, "re")) == NULL)) {
1339                 *errnop = errno;
1340                 rv = NS_UNAVAIL;
1341                 goto fin;
1342         }
1343         if (how == nss_lt_all)
1344                 stayopen = 1;
1345         else {
1346                 rewind(st->fp);
1347                 stayopen = st->stayopen;
1348         }
1349 docompat:
1350         switch (st->compat) {
1351         case COMPAT_MODE_ALL:
1352                 set_lookup_type(dtab, how);
1353                 switch (how) {
1354                 case nss_lt_all:
1355                         rv = _nsdispatch(&discard, dtab, NSDB_GROUP_COMPAT,
1356                             "getgrent_r", compatsrc, grp, buffer, bufsize,
1357                             errnop);
1358                         break;
1359                 case nss_lt_id:
1360                         rv = _nsdispatch(&discard, dtab, NSDB_GROUP_COMPAT,
1361                             "getgrgid_r", compatsrc, gid, grp, buffer, bufsize,
1362                             errnop);
1363                         break;
1364                 case nss_lt_name:
1365                         rv = _nsdispatch(&discard, dtab, NSDB_GROUP_COMPAT,
1366                             "getgrnam_r", compatsrc, name, grp, buffer,
1367                             bufsize, errnop);
1368                         break;
1369                 }
1370                 if (rv & NS_TERMINATE)
1371                         goto fin;
1372                 st->compat = COMPAT_MODE_OFF;
1373                 break;
1374         case COMPAT_MODE_NAME:
1375                 set_lookup_type(dtab, nss_lt_name);
1376                 rv = _nsdispatch(&discard, dtab, NSDB_GROUP_COMPAT,
1377                     "getgrnam_r", compatsrc, st->name, grp, buffer, bufsize,
1378                     errnop);
1379                 switch (rv) {
1380                 case NS_SUCCESS:
1381                         switch (how) {
1382                         case nss_lt_name:
1383                                 if (strcmp(name, grp->gr_name) != 0)
1384                                         rv = NS_NOTFOUND;
1385                                 break;
1386                         case nss_lt_id:
1387                                 if (gid != grp->gr_gid)
1388                                         rv = NS_NOTFOUND;
1389                                 break;
1390                         default:
1391                                 break;
1392                         }
1393                         break;
1394                 case NS_RETURN:
1395                         goto fin;
1396                 default:
1397                         break;
1398                 }
1399                 free(st->name);
1400                 st->name = NULL;
1401                 st->compat = COMPAT_MODE_OFF;
1402                 if (rv == NS_SUCCESS)
1403                         goto fin;
1404                 break;
1405         default:
1406                 break;
1407         }
1408         rv = NS_NOTFOUND;
1409         pos = ftello(st->fp);
1410         while ((line = fgetln(st->fp, &linesize)) != NULL) {
1411                 if (line[linesize-1] == '\n')
1412                         linesize--;
1413                 if (linesize > 2 && line[0] == '+') {
1414                         p = memchr(&line[1], ':', linesize);
1415                         if (p == NULL || p == &line[1])
1416                                 st->compat = COMPAT_MODE_ALL;
1417                         else {
1418                                 st->name = malloc(p - line);
1419                                 if (st->name == NULL) {
1420                                         syslog(LOG_ERR,
1421                                          "getgrent memory allocation failure");
1422                                         *errnop = ENOMEM;
1423                                         rv = NS_UNAVAIL;
1424                                         break;
1425                                 }
1426                                 memcpy(st->name, &line[1], p - line - 1);
1427                                 st->name[p - line - 1] = '\0';
1428                                 st->compat = COMPAT_MODE_NAME;
1429                         }
1430                         goto docompat;
1431                 }
1432                 rv = __gr_match_entry(line, linesize, how, name, gid);
1433                 if (rv != NS_SUCCESS)
1434                         continue;
1435                 /* We need room at least for the line, a string NUL
1436                  * terminator, alignment padding, and one (char *)
1437                  * pointer for the member list terminator.
1438                  */
1439                 if (bufsize <= linesize + _ALIGNBYTES + sizeof(char *)) {
1440                         *errnop = ERANGE;
1441                         rv = NS_RETURN;
1442                         break;
1443                 }
1444                 memcpy(buffer, line, linesize);
1445                 buffer[linesize] = '\0';
1446                 rv = __gr_parse_entry(buffer, linesize, grp,
1447                     &buffer[linesize + 1], bufsize - linesize - 1, errnop);
1448                 if (rv & NS_TERMINATE)
1449                         break;
1450                 pos = ftello(st->fp);
1451         }
1452 fin:
1453         if (!stayopen && st->fp != NULL) {
1454                 fclose(st->fp);
1455                 st->fp = NULL;
1456         }
1457         if (rv == NS_SUCCESS && retval != NULL)
1458                 *(struct group **)retval = grp;
1459         else if (rv == NS_RETURN && *errnop == ERANGE && st->fp != NULL)
1460                 fseeko(st->fp, pos, SEEK_SET);
1461         return (rv);
1462 #undef set_lookup_type
1463 }
1464
1465
1466 /*
1467  * common group line matching and parsing
1468  */
1469 int
1470 __gr_match_entry(const char *line, size_t linesize, enum nss_lookup_type how,
1471     const char *name, gid_t gid)
1472 {
1473         size_t           namesize;
1474         const char      *p, *eol;
1475         char            *q;
1476         unsigned long    n;
1477         int              i, needed;
1478
1479         if (linesize == 0 || is_comment_line(line, linesize))
1480                 return (NS_NOTFOUND);
1481         switch (how) {
1482         case nss_lt_name:       needed = 1; break;
1483         case nss_lt_id:         needed = 2; break;
1484         default:                needed = 2; break;
1485         }
1486         eol = &line[linesize];
1487         for (p = line, i = 0; i < needed && p < eol; p++)
1488                 if (*p == ':')
1489                         i++;
1490         if (i < needed)
1491                 return (NS_NOTFOUND);
1492         switch (how) {
1493         case nss_lt_name:
1494                 namesize = strlen(name);
1495                 if (namesize + 1 == (size_t)(p - line) &&
1496                     memcmp(line, name, namesize) == 0)
1497                         return (NS_SUCCESS);
1498                 break;
1499         case nss_lt_id:
1500                 n = strtoul(p, &q, 10);
1501                 if (q < eol && *q == ':' && gid == (gid_t)n)
1502                         return (NS_SUCCESS);
1503                 break;
1504         case nss_lt_all:
1505                 return (NS_SUCCESS);
1506         default:
1507                 break;
1508         }
1509         return (NS_NOTFOUND);
1510 }
1511
1512
1513 int
1514 __gr_parse_entry(char *line, size_t linesize, struct group *grp, char *membuf,
1515     size_t membufsize, int *errnop)
1516 {
1517         char           *s_gid, *s_mem, *p, **members;
1518         unsigned long   n;
1519         int             maxmembers;
1520
1521         memset(grp, 0, sizeof(*grp));
1522         members = (char **)_ALIGN(membuf);
1523         membufsize -= (char *)members - membuf;
1524         maxmembers = membufsize / sizeof(*members);
1525         if (maxmembers <= 0 ||
1526             (grp->gr_name = strsep(&line, ":")) == NULL ||
1527             grp->gr_name[0] == '\0' ||
1528             (grp->gr_passwd = strsep(&line, ":")) == NULL ||
1529             (s_gid = strsep(&line, ":")) == NULL ||
1530             s_gid[0] == '\0')
1531                 return (NS_NOTFOUND);
1532         s_mem = line;
1533         n = strtoul(s_gid, &s_gid, 10);
1534         if (s_gid[0] != '\0')
1535                 return (NS_NOTFOUND);
1536         grp->gr_gid = (gid_t)n;
1537         grp->gr_mem = members;
1538         while (maxmembers > 1 && s_mem != NULL) {
1539                 p = strsep(&s_mem, ",");
1540                 if (p != NULL && *p != '\0') {
1541                         *members++ = p;
1542                         maxmembers--;
1543                 }
1544         }
1545         *members = NULL;
1546         if (s_mem == NULL)
1547                 return (NS_SUCCESS);
1548         else {
1549                 *errnop = ERANGE;
1550                 return (NS_RETURN);
1551         }
1552 }
1553
1554