nsswitch/winbind_nss_linux.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Windows NT Domain nsswitch module
   5
   6    Copyright (C) Tim Potter 2000
   7
   8    This library is free software; you can redistribute it and/or
   9    modify it under the terms of the GNU Lesser General Public
  10    License as published by the Free Software Foundation; either
  11    version 3 of the License, or (at your option) any later version.
  12
  13    This library is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16    Library General Public License for more details.
  17
  18    You should have received a copy of the GNU Lesser General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "winbind_client.h"
  23
  24 #ifdef HAVE_PTHREAD_H
  25 #include <pthread.h>
  26 #endif
  27
  28 #ifdef HAVE_PTHREAD
  29 static pthread_mutex_t winbind_nss_mutex = PTHREAD_MUTEX_INITIALIZER;
  30 #endif
  31
  32 /* Maximum number of users to pass back over the unix domain socket
  33    per call. This is not a static limit on the total number of users
  34    or groups returned in total. */
  35
  36 #define MAX_GETPWENT_USERS 250
  37 #define MAX_GETGRENT_USERS 250
  38
  39 /*************************************************************************
  40  ************************************************************************/
  41
  42 #ifdef DEBUG_NSS
  43 static const char *nss_err_str(NSS_STATUS ret)
  44 {
  45         switch (ret) {
  46                 case NSS_STATUS_TRYAGAIN:
  47                         return "NSS_STATUS_TRYAGAIN";
  48                 case NSS_STATUS_SUCCESS:
  49                         return "NSS_STATUS_SUCCESS";
  50                 case NSS_STATUS_NOTFOUND:
  51                         return "NSS_STATUS_NOTFOUND";
  52                 case NSS_STATUS_UNAVAIL:
  53                         return "NSS_STATUS_UNAVAIL";
  54 #ifdef NSS_STATUS_RETURN
  55                 case NSS_STATUS_RETURN:
  56                         return "NSS_STATUS_RETURN";
  57 #endif
  58                 default:
  59                         return "UNKNOWN RETURN CODE!!!!!!!";
  60         }
  61 }
  62 #endif
  63
  64 /* Prototypes from wb_common.c */
  65
  66 /* Allocate some space from the nss static buffer.  The buffer and buflen
  67    are the pointers passed in by the C library to the _nss_ntdom_*
  68    functions. */
  69
  70 static char *get_static(char **buffer, size_t *buflen, size_t len)
  71 {
  72         char *result;
  73
  74         /* Error check.  We return false if things aren't set up right, or
  75            there isn't enough buffer space left. */
  76
  77         if ((buffer == NULL) || (buflen == NULL) || (*buflen < len)) {
  78                 return NULL;
  79         }
  80
  81         /* Return an index into the static buffer */
  82
  83         result = *buffer;
  84         *buffer += len;
  85         *buflen -= len;
  86
  87         return result;
  88 }
  89
  90 /* I've copied the strtok() replacement function next_token_Xalloc() from
  91    lib/util_str.c as I really don't want to have to link in any other
  92    objects if I can possibly avoid it. */
  93
  94 static bool next_token_alloc(const char **ptr,
  95                                 char **pp_buff,
  96                                 const char *sep)
  97 {
  98         const char *s;
  99         const char *saved_s;
 100         char *pbuf;
 101         bool quoted;
 102         size_t len=1;
 103
 104         *pp_buff = NULL;
 105         if (!ptr) {
 106                 return(false);
 107         }
 108
 109         s = *ptr;
 110
 111         /* default to simple separators */
 112         if (!sep) {
 113                 sep = " \t\n\r";
 114         }
 115
 116         /* find the first non sep char */
 117         while (*s && strchr(sep,*s)) {
 118                 s++;
 119         }
 120
 121         /* nothing left? */
 122         if (!*s) {
 123                 return false;
 124         }
 125
 126         /* When restarting we need to go from here. */
 127         saved_s = s;
 128
 129         /* Work out the length needed. */
 130         for (quoted = false; *s &&
 131                         (quoted || !strchr(sep,*s)); s++) {
 132                 if (*s == '\"') {
 133                         quoted = !quoted;
 134                 } else {
 135                         len++;
 136                 }
 137         }
 138
 139         /* We started with len = 1 so we have space for the nul. */
 140         *pp_buff = (char *)malloc(len);
 141         if (!*pp_buff) {
 142                 return false;
 143         }
 144
 145         /* copy over the token */
 146         pbuf = *pp_buff;
 147         s = saved_s;
 148         for (quoted = false; *s &&
 149                         (quoted || !strchr(sep,*s)); s++) {
 150                 if ( *s == '\"' ) {
 151                         quoted = !quoted;
 152                 } else {
 153                         *pbuf++ = *s;
 154                 }
 155         }
 156
 157         *ptr = (*s) ? s+1 : s;
 158         *pbuf = 0;
 159
 160         return true;
 161 }
 162
 163 /* Fill a pwent structure from a winbindd_response structure.  We use
 164    the static data passed to us by libc to put strings and stuff in.
 165    Return NSS_STATUS_TRYAGAIN if we run out of memory. */
 166
 167 static NSS_STATUS fill_pwent(struct passwd *result,
 168                                   struct winbindd_pw *pw,
 169                                   char **buffer, size_t *buflen)
 170 {
 171         size_t len;
 172
 173         /* User name */
 174         len = strlen(pw->pw_name) + 1;
 175
 176         if ((result->pw_name =
 177              get_static(buffer, buflen, len)) == NULL) {
 178
 179                 /* Out of memory */
 180
 181                 return NSS_STATUS_TRYAGAIN;
 182         }
 183
 184         memcpy(result->pw_name, pw->pw_name, len);
 185
 186         /* Password */
 187         len = strlen(pw->pw_passwd) + 1;
 188
 189         if ((result->pw_passwd =
 190              get_static(buffer, buflen, len)) == NULL) {
 191
 192                 /* Out of memory */
 193
 194                 return NSS_STATUS_TRYAGAIN;
 195         }
 196
 197         memcpy(result->pw_passwd, pw->pw_passwd, len);
 198
 199         /* [ug]id */
 200
 201         result->pw_uid = pw->pw_uid;
 202         result->pw_gid = pw->pw_gid;
 203
 204         /* GECOS */
 205         len = strlen(pw->pw_gecos) + 1;
 206
 207         if ((result->pw_gecos =
 208              get_static(buffer, buflen, len)) == NULL) {
 209
 210                 /* Out of memory */
 211
 212                 return NSS_STATUS_TRYAGAIN;
 213         }
 214
 215         memcpy(result->pw_gecos, pw->pw_gecos, len);
 216
 217         /* Home directory */
 218         len = strlen(pw->pw_dir) + 1;
 219
 220         if ((result->pw_dir =
 221              get_static(buffer, buflen, len)) == NULL) {
 222
 223                 /* Out of memory */
 224
 225                 return NSS_STATUS_TRYAGAIN;
 226         }
 227
 228         memcpy(result->pw_dir, pw->pw_dir, len);
 229
 230         /* Logon shell */
 231         len = strlen(pw->pw_shell) + 1;
 232
 233         if ((result->pw_shell =
 234              get_static(buffer, buflen, len)) == NULL) {
 235
 236                 /* Out of memory */
 237
 238                 return NSS_STATUS_TRYAGAIN;
 239         }
 240
 241         memcpy(result->pw_shell, pw->pw_shell, len);
 242
 243         /* The struct passwd for Solaris has some extra fields which must
 244            be initialised or nscd crashes. */
 245
 246 #ifdef HAVE_PASSWD_PW_COMMENT
 247         result->pw_comment = "";
 248 #endif
 249
 250 #ifdef HAVE_PASSWD_PW_AGE
 251         result->pw_age = "";
 252 #endif
 253
 254         return NSS_STATUS_SUCCESS;
 255 }
 256
 257 /* Fill a grent structure from a winbindd_response structure.  We use
 258    the static data passed to us by libc to put strings and stuff in.
 259    Return NSS_STATUS_TRYAGAIN if we run out of memory. */
 260
 261 static NSS_STATUS fill_grent(struct group *result, struct winbindd_gr *gr,
 262                       const char *gr_mem, char **buffer, size_t *buflen)
 263 {
 264         char *name;
 265         int i;
 266         char *tst;
 267         size_t len;
 268
 269         /* Group name */
 270         len = strlen(gr->gr_name) + 1;
 271
 272         if ((result->gr_name =
 273              get_static(buffer, buflen, len)) == NULL) {
 274
 275                 /* Out of memory */
 276
 277                 return NSS_STATUS_TRYAGAIN;
 278         }
 279
 280         memcpy(result->gr_name, gr->gr_name, len);
 281
 282         /* Password */
 283         len = strlen(gr->gr_passwd) + 1;
 284
 285         if ((result->gr_passwd =
 286              get_static(buffer, buflen, len)) == NULL) {
 287
 288                 /* Out of memory */
 289                 return NSS_STATUS_TRYAGAIN;
 290         }
 291
 292         memcpy(result->gr_passwd, gr->gr_passwd, len);
 293
 294         /* gid */
 295
 296         result->gr_gid = gr->gr_gid;
 297
 298         /* Group membership */
 299
 300         if (!gr_mem) {
 301                 gr->num_gr_mem = 0;
 302         }
 303
 304         /* this next value is a pointer to a pointer so let's align it */
 305
 306         /* Calculate number of extra bytes needed to align on pointer size boundry */
 307         if ((i = (unsigned long)(*buffer) % sizeof(char*)) != 0)
 308                 i = sizeof(char*) - i;
 309
 310         if ((tst = get_static(buffer, buflen, ((gr->num_gr_mem + 1) *
 311                                  sizeof(char *)+i))) == NULL) {
 312
 313                 /* Out of memory */
 314
 315                 return NSS_STATUS_TRYAGAIN;
 316         }
 317         result->gr_mem = (char **)(tst + i);
 318
 319         if (gr->num_gr_mem == 0) {
 320
 321                 /* Group is empty */
 322
 323                 *(result->gr_mem) = NULL;
 324                 return NSS_STATUS_SUCCESS;
 325         }
 326
 327         /* Start looking at extra data */
 328
 329         i = 0;
 330
 331         while(next_token_alloc((const char **)&gr_mem, &name, ",")) {
 332                 /* Allocate space for member */
 333                 len = strlen(name) + 1;
 334
 335                 if (((result->gr_mem)[i] =
 336                      get_static(buffer, buflen, len)) == NULL) {
 337                         free(name);
 338                         /* Out of memory */
 339                         return NSS_STATUS_TRYAGAIN;
 340                 }
 341                 memcpy((result->gr_mem)[i], name, len);
 342                 free(name);
 343                 i++;
 344         }
 345
 346         /* Terminate list */
 347
 348         (result->gr_mem)[i] = NULL;
 349
 350         return NSS_STATUS_SUCCESS;
 351 }
 352
 353 /*
 354  * NSS user functions
 355  */
 356
 357 static struct winbindd_response getpwent_response;
 358
 359 static int ndx_pw_cache;                 /* Current index into pwd cache */
 360 static int num_pw_cache;                 /* Current size of pwd cache */
 361
 362 /* Rewind "file pointer" to start of ntdom password database */
 363
 364 NSS_STATUS
 365 _nss_winbind_setpwent(void)
 366 {
 367         NSS_STATUS ret;
 368 #ifdef DEBUG_NSS
 369         fprintf(stderr, "[%5d]: setpwent\n", getpid());
 370 #endif
 371
 372 #ifdef HAVE_PTHREAD
 373         pthread_mutex_lock(&winbind_nss_mutex);
 374 #endif
 375
 376         if (num_pw_cache > 0) {
 377                 ndx_pw_cache = num_pw_cache = 0;
 378                 winbindd_free_response(&getpwent_response);
 379         }
 380
 381         winbind_set_client_name("nss_winbind");
 382         ret = winbindd_request_response(NULL, WINBINDD_SETPWENT, NULL, NULL);
 383 #ifdef DEBUG_NSS
 384         fprintf(stderr, "[%5d]: setpwent returns %s (%d)\n", getpid(),
 385                 nss_err_str(ret), ret);
 386 #endif
 387
 388 #ifdef HAVE_PTHREAD
 389         pthread_mutex_unlock(&winbind_nss_mutex);
 390 #endif
 391         return ret;
 392 }
 393
 394 /* Close ntdom password database "file pointer" */
 395
 396 NSS_STATUS
 397 _nss_winbind_endpwent(void)
 398 {
 399         NSS_STATUS ret;
 400 #ifdef DEBUG_NSS
 401         fprintf(stderr, "[%5d]: endpwent\n", getpid());
 402 #endif
 403
 404 #ifdef HAVE_PTHREAD
 405         pthread_mutex_lock(&winbind_nss_mutex);
 406 #endif
 407
 408         if (num_pw_cache > 0) {
 409                 ndx_pw_cache = num_pw_cache = 0;
 410                 winbindd_free_response(&getpwent_response);
 411         }
 412
 413         winbind_set_client_name("nss_winbind");
 414         ret = winbindd_request_response(NULL, WINBINDD_ENDPWENT, NULL, NULL);
 415 #ifdef DEBUG_NSS
 416         fprintf(stderr, "[%5d]: endpwent returns %s (%d)\n", getpid(),
 417                 nss_err_str(ret), ret);
 418 #endif
 419
 420 #ifdef HAVE_PTHREAD
 421         pthread_mutex_unlock(&winbind_nss_mutex);
 422 #endif
 423
 424         return ret;
 425 }
 426
 427 /* Fetch the next password entry from ntdom password database */
 428
 429 NSS_STATUS
 430 _nss_winbind_getpwent_r(struct passwd *result, char *buffer,
 431                         size_t buflen, int *errnop)
 432 {
 433         NSS_STATUS ret;
 434         struct winbindd_request request;
 435         static int called_again;
 436
 437 #ifdef DEBUG_NSS
 438         fprintf(stderr, "[%5d]: getpwent\n", getpid());
 439 #endif
 440
 441 #ifdef HAVE_PTHREAD
 442         pthread_mutex_lock(&winbind_nss_mutex);
 443 #endif
 444
 445         /* Return an entry from the cache if we have one, or if we are
 446            called again because we exceeded our static buffer.  */
 447
 448         if ((ndx_pw_cache < num_pw_cache) || called_again) {
 449                 goto return_result;
 450         }
 451
 452         /* Else call winbindd to get a bunch of entries */
 453
 454         if (num_pw_cache > 0) {
 455                 winbindd_free_response(&getpwent_response);
 456         }
 457
 458         ZERO_STRUCT(request);
 459         ZERO_STRUCT(getpwent_response);
 460
 461         request.data.num_entries = MAX_GETPWENT_USERS;
 462
 463         winbind_set_client_name("nss_winbind");
 464         ret = winbindd_request_response(NULL, WINBINDD_GETPWENT, &request,
 465                                &getpwent_response);
 466
 467         if (ret == NSS_STATUS_SUCCESS) {
 468                 struct winbindd_pw *pw_cache;
 469
 470                 /* Fill cache */
 471
 472                 ndx_pw_cache = 0;
 473                 num_pw_cache = getpwent_response.data.num_entries;
 474
 475                 /* Return a result */
 476
 477         return_result:
 478
 479                 pw_cache = (struct winbindd_pw *)
 480                         getpwent_response.extra_data.data;
 481
 482                 /* Check data is valid */
 483
 484                 if (pw_cache == NULL) {
 485                         ret = NSS_STATUS_NOTFOUND;
 486                         goto done;
 487                 }
 488
 489                 ret = fill_pwent(result, &pw_cache[ndx_pw_cache],
 490                                  &buffer, &buflen);
 491
 492                 /* Out of memory - try again */
 493
 494                 if (ret == NSS_STATUS_TRYAGAIN) {
 495                         called_again = true;
 496                         *errnop = errno = ERANGE;
 497                         goto done;
 498                 }
 499
 500                 *errnop = errno = 0;
 501                 called_again = false;
 502                 ndx_pw_cache++;
 503
 504                 /* If we've finished with this lot of results free cache */
 505
 506                 if (ndx_pw_cache == num_pw_cache) {
 507                         ndx_pw_cache = num_pw_cache = 0;
 508                         winbindd_free_response(&getpwent_response);
 509                 }
 510         }
 511         done:
 512 #ifdef DEBUG_NSS
 513         fprintf(stderr, "[%5d]: getpwent returns %s (%d)\n", getpid(),
 514                 nss_err_str(ret), ret);
 515 #endif
 516
 517 #ifdef HAVE_PTHREAD
 518         pthread_mutex_unlock(&winbind_nss_mutex);
 519 #endif
 520         return ret;
 521 }
 522
 523 /* Return passwd struct from uid */
 524
 525 NSS_STATUS
 526 _nss_winbind_getpwuid_r(uid_t uid, struct passwd *result, char *buffer,
 527                         size_t buflen, int *errnop)
 528 {
 529         NSS_STATUS ret;
 530         static struct winbindd_response response;
 531         struct winbindd_request request;
 532         static int keep_response;
 533
 534 #ifdef DEBUG_NSS
 535         fprintf(stderr, "[%5d]: getpwuid_r %d\n", getpid(), (unsigned int)uid);
 536 #endif
 537
 538 #ifdef HAVE_PTHREAD
 539         pthread_mutex_lock(&winbind_nss_mutex);
 540 #endif
 541
 542         /* If our static buffer needs to be expanded we are called again */
 543         if (!keep_response || uid != response.data.pw.pw_uid) {
 544
 545                 /* Call for the first time */
 546
 547                 ZERO_STRUCT(response);
 548                 ZERO_STRUCT(request);
 549
 550                 request.data.uid = uid;
 551
 552                 winbind_set_client_name("nss_winbind");
 553                 ret = winbindd_request_response(NULL, WINBINDD_GETPWUID, &request, &response);
 554
 555                 if (ret == NSS_STATUS_SUCCESS) {
 556                         ret = fill_pwent(result, &response.data.pw,
 557                                          &buffer, &buflen);
 558
 559                         if (ret == NSS_STATUS_TRYAGAIN) {
 560                                 keep_response = true;
 561                                 *errnop = errno = ERANGE;
 562                                 goto done;
 563                         }
 564                 }
 565
 566         } else {
 567
 568                 /* We've been called again */
 569
 570                 ret = fill_pwent(result, &response.data.pw, &buffer, &buflen);
 571
 572                 if (ret == NSS_STATUS_TRYAGAIN) {
 573                         *errnop = errno = ERANGE;
 574                         goto done;
 575                 }
 576
 577                 keep_response = false;
 578                 *errnop = errno = 0;
 579         }
 580
 581         winbindd_free_response(&response);
 582
 583         done:
 584
 585 #ifdef DEBUG_NSS
 586         fprintf(stderr, "[%5d]: getpwuid %d returns %s (%d)\n", getpid(),
 587                 (unsigned int)uid, nss_err_str(ret), ret);
 588 #endif
 589
 590 #ifdef HAVE_PTHREAD
 591         pthread_mutex_unlock(&winbind_nss_mutex);
 592 #endif
 593
 594         return ret;
 595 }
 596
 597 /* Return passwd struct from username */
 598 NSS_STATUS
 599 _nss_winbind_getpwnam_r(const char *name, struct passwd *result, char *buffer,
 600                         size_t buflen, int *errnop)
 601 {
 602         NSS_STATUS ret;
 603         static struct winbindd_response response;
 604         struct winbindd_request request;
 605         static int keep_response;
 606
 607 #ifdef DEBUG_NSS
 608         fprintf(stderr, "[%5d]: getpwnam_r %s\n", getpid(), name);
 609 #endif
 610
 611 #ifdef HAVE_PTHREAD
 612         pthread_mutex_lock(&winbind_nss_mutex);
 613 #endif
 614
 615         /* If our static buffer needs to be expanded we are called again */
 616
 617         if (!keep_response || strcmp(name,response.data.pw.pw_name) != 0) {
 618
 619                 /* Call for the first time */
 620
 621                 ZERO_STRUCT(response);
 622                 ZERO_STRUCT(request);
 623
 624                 strncpy(request.data.username, name,
 625                         sizeof(request.data.username) - 1);
 626                 request.data.username
 627                         [sizeof(request.data.username) - 1] = '\0';
 628
 629                 winbind_set_client_name("nss_winbind");
 630                 ret = winbindd_request_response(NULL, WINBINDD_GETPWNAM, &request, &response);
 631
 632                 if (ret == NSS_STATUS_SUCCESS) {
 633                         ret = fill_pwent(result, &response.data.pw, &buffer,
 634                                          &buflen);
 635
 636                         if (ret == NSS_STATUS_TRYAGAIN) {
 637                                 keep_response = true;
 638                                 *errnop = errno = ERANGE;
 639                                 goto done;
 640                         }
 641                 }
 642
 643         } else {
 644
 645                 /* We've been called again */
 646
 647                 ret = fill_pwent(result, &response.data.pw, &buffer, &buflen);
 648
 649                 if (ret == NSS_STATUS_TRYAGAIN) {
 650                         keep_response = true;
 651                         *errnop = errno = ERANGE;
 652                         goto done;
 653                 }
 654
 655                 keep_response = false;
 656                 *errnop = errno = 0;
 657         }
 658
 659         winbindd_free_response(&response);
 660         done:
 661 #ifdef DEBUG_NSS
 662         fprintf(stderr, "[%5d]: getpwnam %s returns %s (%d)\n", getpid(),
 663                 name, nss_err_str(ret), ret);
 664 #endif
 665
 666 #ifdef HAVE_PTHREAD
 667         pthread_mutex_unlock(&winbind_nss_mutex);
 668 #endif
 669
 670         return ret;
 671 }
 672
 673 /*
 674  * NSS group functions
 675  */
 676
 677 static struct winbindd_response getgrent_response;
 678
 679 static int ndx_gr_cache;                 /* Current index into grp cache */
 680 static int num_gr_cache;                 /* Current size of grp cache */
 681
 682 /* Rewind "file pointer" to start of ntdom group database */
 683
 684 NSS_STATUS
 685 _nss_winbind_setgrent(void)
 686 {
 687         NSS_STATUS ret;
 688 #ifdef DEBUG_NSS
 689         fprintf(stderr, "[%5d]: setgrent\n", getpid());
 690 #endif
 691
 692 #ifdef HAVE_PTHREAD
 693         pthread_mutex_lock(&winbind_nss_mutex);
 694 #endif
 695
 696         if (num_gr_cache > 0) {
 697                 ndx_gr_cache = num_gr_cache = 0;
 698                 winbindd_free_response(&getgrent_response);
 699         }
 700
 701         winbind_set_client_name("nss_winbind");
 702         ret = winbindd_request_response(NULL, WINBINDD_SETGRENT, NULL, NULL);
 703 #ifdef DEBUG_NSS
 704         fprintf(stderr, "[%5d]: setgrent returns %s (%d)\n", getpid(),
 705                 nss_err_str(ret), ret);
 706 #endif
 707
 708 #ifdef HAVE_PTHREAD
 709         pthread_mutex_unlock(&winbind_nss_mutex);
 710 #endif
 711
 712         return ret;
 713 }
 714
 715 /* Close "file pointer" for ntdom group database */
 716
 717 NSS_STATUS
 718 _nss_winbind_endgrent(void)
 719 {
 720         NSS_STATUS ret;
 721 #ifdef DEBUG_NSS
 722         fprintf(stderr, "[%5d]: endgrent\n", getpid());
 723 #endif
 724
 725 #ifdef HAVE_PTHREAD
 726         pthread_mutex_lock(&winbind_nss_mutex);
 727 #endif
 728
 729         if (num_gr_cache > 0) {
 730                 ndx_gr_cache = num_gr_cache = 0;
 731                 winbindd_free_response(&getgrent_response);
 732         }
 733
 734         winbind_set_client_name("nss_winbind");
 735         ret = winbindd_request_response(NULL, WINBINDD_ENDGRENT, NULL, NULL);
 736 #ifdef DEBUG_NSS
 737         fprintf(stderr, "[%5d]: endgrent returns %s (%d)\n", getpid(),
 738                 nss_err_str(ret), ret);
 739 #endif
 740
 741 #ifdef HAVE_PTHREAD
 742         pthread_mutex_unlock(&winbind_nss_mutex);
 743 #endif
 744
 745         return ret;
 746 }
 747
 748 /* Get next entry from ntdom group database */
 749
 750 static NSS_STATUS
 751 winbind_getgrent(enum winbindd_cmd cmd,
 752                  struct group *result,
 753                  char *buffer, size_t buflen, int *errnop)
 754 {
 755         NSS_STATUS ret;
 756         static struct winbindd_request request;
 757         static int called_again;
 758
 759
 760 #ifdef DEBUG_NSS
 761         fprintf(stderr, "[%5d]: getgrent\n", getpid());
 762 #endif
 763
 764 #ifdef HAVE_PTHREAD
 765         pthread_mutex_lock(&winbind_nss_mutex);
 766 #endif
 767
 768         /* Return an entry from the cache if we have one, or if we are
 769            called again because we exceeded our static buffer.  */
 770
 771         if ((ndx_gr_cache < num_gr_cache) || called_again) {
 772                 goto return_result;
 773         }
 774
 775         /* Else call winbindd to get a bunch of entries */
 776
 777         if (num_gr_cache > 0) {
 778                 winbindd_free_response(&getgrent_response);
 779         }
 780
 781         ZERO_STRUCT(request);
 782         ZERO_STRUCT(getgrent_response);
 783
 784         request.data.num_entries = MAX_GETGRENT_USERS;
 785
 786         winbind_set_client_name("nss_winbind");
 787         ret = winbindd_request_response(NULL, cmd, &request,
 788                                &getgrent_response);
 789
 790         if (ret == NSS_STATUS_SUCCESS) {
 791                 struct winbindd_gr *gr_cache;
 792                 int mem_ofs;
 793
 794                 /* Fill cache */
 795
 796                 ndx_gr_cache = 0;
 797                 num_gr_cache = getgrent_response.data.num_entries;
 798
 799                 /* Return a result */
 800
 801         return_result:
 802
 803                 gr_cache = (struct winbindd_gr *)
 804                         getgrent_response.extra_data.data;
 805
 806                 /* Check data is valid */
 807
 808                 if (gr_cache == NULL) {
 809                         ret = NSS_STATUS_NOTFOUND;
 810                         goto done;
 811                 }
 812
 813                 /* Fill group membership.  The offset into the extra data
 814                    for the group membership is the reported offset plus the
 815                    size of all the winbindd_gr records returned. */
 816
 817                 mem_ofs = gr_cache[ndx_gr_cache].gr_mem_ofs +
 818                         num_gr_cache * sizeof(struct winbindd_gr);
 819
 820                 ret = fill_grent(result, &gr_cache[ndx_gr_cache],
 821                                  ((char *)getgrent_response.extra_data.data)+mem_ofs,
 822                                  &buffer, &buflen);
 823
 824                 /* Out of memory - try again */
 825
 826                 if (ret == NSS_STATUS_TRYAGAIN) {
 827                         called_again = true;
 828                         *errnop = errno = ERANGE;
 829                         goto done;
 830                 }
 831
 832                 *errnop = 0;
 833                 called_again = false;
 834                 ndx_gr_cache++;
 835
 836                 /* If we've finished with this lot of results free cache */
 837
 838                 if (ndx_gr_cache == num_gr_cache) {
 839                         ndx_gr_cache = num_gr_cache = 0;
 840                         winbindd_free_response(&getgrent_response);
 841                 }
 842         }
 843         done:
 844 #ifdef DEBUG_NSS
 845         fprintf(stderr, "[%5d]: getgrent returns %s (%d)\n", getpid(),
 846                 nss_err_str(ret), ret);
 847 #endif
 848
 849 #ifdef HAVE_PTHREAD
 850         pthread_mutex_unlock(&winbind_nss_mutex);
 851 #endif
 852
 853         return ret;
 854 }
 855
 856
 857 NSS_STATUS
 858 _nss_winbind_getgrent_r(struct group *result,
 859                         char *buffer, size_t buflen, int *errnop)
 860 {
 861         return winbind_getgrent(WINBINDD_GETGRENT, result, buffer, buflen, errnop);
 862 }
 863
 864 NSS_STATUS
 865 _nss_winbind_getgrlst_r(struct group *result,
 866                         char *buffer, size_t buflen, int *errnop)
 867 {
 868         return winbind_getgrent(WINBINDD_GETGRLST, result, buffer, buflen, errnop);
 869 }
 870
 871 /* Return group struct from group name */
 872
 873 NSS_STATUS
 874 _nss_winbind_getgrnam_r(const char *name,
 875                         struct group *result, char *buffer,
 876                         size_t buflen, int *errnop)
 877 {
 878         NSS_STATUS ret;
 879         static struct winbindd_response response;
 880         struct winbindd_request request;
 881         static int keep_response;
 882
 883 #ifdef DEBUG_NSS
 884         fprintf(stderr, "[%5d]: getgrnam %s\n", getpid(), name);
 885 #endif
 886
 887 #ifdef HAVE_PTHREAD
 888         pthread_mutex_lock(&winbind_nss_mutex);
 889 #endif
 890
 891         /* If our static buffer needs to be expanded we are called again */
 892         /* Or if the stored response group name differs from the request. */
 893
 894         if (!keep_response || strcmp(name,response.data.gr.gr_name) != 0) {
 895
 896                 /* Call for the first time */
 897
 898                 ZERO_STRUCT(request);
 899                 ZERO_STRUCT(response);
 900
 901                 strncpy(request.data.groupname, name,
 902                         sizeof(request.data.groupname));
 903                 request.data.groupname
 904                         [sizeof(request.data.groupname) - 1] = '\0';
 905
 906                 winbind_set_client_name("nss_winbind");
 907                 ret = winbindd_request_response(NULL, WINBINDD_GETGRNAM,
 908                                                 &request, &response);
 909
 910                 if (ret == NSS_STATUS_SUCCESS) {
 911                         ret = fill_grent(result, &response.data.gr,
 912                                          (char *)response.extra_data.data,
 913                                          &buffer, &buflen);
 914
 915                         if (ret == NSS_STATUS_TRYAGAIN) {
 916                                 keep_response = true;
 917                                 *errnop = errno = ERANGE;
 918                                 goto done;
 919                         }
 920                 }
 921
 922         } else {
 923
 924                 /* We've been called again */
 925
 926                 ret = fill_grent(result, &response.data.gr,
 927                                  (char *)response.extra_data.data, &buffer,
 928                                  &buflen);
 929
 930                 if (ret == NSS_STATUS_TRYAGAIN) {
 931                         keep_response = true;
 932                         *errnop = errno = ERANGE;
 933                         goto done;
 934                 }
 935
 936                 keep_response = false;
 937                 *errnop = 0;
 938         }
 939
 940         winbindd_free_response(&response);
 941         done:
 942 #ifdef DEBUG_NSS
 943         fprintf(stderr, "[%5d]: getgrnam %s returns %s (%d)\n", getpid(),
 944                 name, nss_err_str(ret), ret);
 945 #endif
 946
 947 #ifdef HAVE_PTHREAD
 948         pthread_mutex_unlock(&winbind_nss_mutex);
 949 #endif
 950
 951         return ret;
 952 }
 953
 954 /* Return group struct from gid */
 955
 956 NSS_STATUS
 957 _nss_winbind_getgrgid_r(gid_t gid,
 958                         struct group *result, char *buffer,
 959                         size_t buflen, int *errnop)
 960 {
 961         NSS_STATUS ret;
 962         static struct winbindd_response response;
 963         struct winbindd_request request;
 964         static int keep_response;
 965
 966 #ifdef DEBUG_NSS
 967         fprintf(stderr, "[%5d]: getgrgid %d\n", getpid(), gid);
 968 #endif
 969
 970 #ifdef HAVE_PTHREAD
 971         pthread_mutex_lock(&winbind_nss_mutex);
 972 #endif
 973
 974         /* If our static buffer needs to be expanded we are called again */
 975         /* Or if the stored response group name differs from the request. */
 976
 977         if (!keep_response || gid != response.data.gr.gr_gid) {
 978
 979                 /* Call for the first time */
 980
 981                 ZERO_STRUCT(request);
 982                 ZERO_STRUCT(response);
 983
 984                 request.data.gid = gid;
 985
 986                 winbind_set_client_name("nss_winbind");
 987                 ret = winbindd_request_response(NULL, WINBINDD_GETGRGID,
 988                                                 &request, &response);
 989
 990                 if (ret == NSS_STATUS_SUCCESS) {
 991
 992                         ret = fill_grent(result, &response.data.gr,
 993                                          (char *)response.extra_data.data,
 994                                          &buffer, &buflen);
 995
 996                         if (ret == NSS_STATUS_TRYAGAIN) {
 997                                 keep_response = true;
 998                                 *errnop = errno = ERANGE;
 999                                 goto done;
1000                         }
1001                 }
1002
1003         } else {
1004
1005                 /* We've been called again */
1006
1007                 ret = fill_grent(result, &response.data.gr,
1008                                  (char *)response.extra_data.data, &buffer,
1009                                  &buflen);
1010
1011                 if (ret == NSS_STATUS_TRYAGAIN) {
1012                         keep_response = true;
1013                         *errnop = errno = ERANGE;
1014                         goto done;
1015                 }
1016
1017                 keep_response = false;
1018                 *errnop = 0;
1019         }
1020
1021         winbindd_free_response(&response);
1022         done:
1023 #ifdef DEBUG_NSS
1024         fprintf(stderr, "[%5d]: getgrgid %d returns %s (%d)\n", getpid(),
1025                 (unsigned int)gid, nss_err_str(ret), ret);
1026 #endif
1027
1028 #ifdef HAVE_PTHREAD
1029         pthread_mutex_unlock(&winbind_nss_mutex);
1030 #endif
1031         return ret;
1032 }
1033
1034 /* Initialise supplementary groups */
1035
1036 NSS_STATUS
1037 _nss_winbind_initgroups_dyn(const char *user, gid_t group, long int *start,
1038                             long int *size, gid_t **groups, long int limit,
1039                             int *errnop)
1040 {
1041         NSS_STATUS ret;
1042         struct winbindd_request request;
1043         struct winbindd_response response;
1044         int i;
1045
1046 #ifdef DEBUG_NSS
1047         fprintf(stderr, "[%5d]: initgroups %s (%d)\n", getpid(),
1048                 user, group);
1049 #endif
1050
1051 #ifdef HAVE_PTHREAD
1052         pthread_mutex_lock(&winbind_nss_mutex);
1053 #endif
1054
1055         ZERO_STRUCT(request);
1056         ZERO_STRUCT(response);
1057
1058         strncpy(request.data.username, user,
1059                 sizeof(request.data.username) - 1);
1060
1061         winbind_set_client_name("nss_winbind");
1062         ret = winbindd_request_response(NULL, WINBINDD_GETGROUPS,
1063                                         &request, &response);
1064
1065         if (ret == NSS_STATUS_SUCCESS) {
1066                 int num_gids = response.data.num_entries;
1067                 gid_t *gid_list = (gid_t *)response.extra_data.data;
1068
1069 #ifdef DEBUG_NSS
1070                 fprintf(stderr, "[%5d]: initgroups %s: got NSS_STATUS_SUCCESS "
1071                                 "and %d gids\n", getpid(),
1072                                 user, num_gids);
1073 #endif
1074                 if (gid_list == NULL) {
1075                         ret = NSS_STATUS_NOTFOUND;
1076                         goto done;
1077                 }
1078
1079                 /* Copy group list to client */
1080
1081                 for (i = 0; i < num_gids; i++) {
1082
1083 #ifdef DEBUG_NSS
1084                         fprintf(stderr, "[%5d]: initgroups %s (%d): "
1085                                         "processing gid %d \n", getpid(),
1086                                         user, group, gid_list[i]);
1087 #endif
1088
1089                         /* Skip primary group */
1090
1091                         if (gid_list[i] == group) {
1092                                 continue;
1093                         }
1094
1095                         /* Skip groups without a mapping */
1096                         if (gid_list[i] == (uid_t)-1) {
1097                                 continue;
1098                         }
1099
1100                         /* Filled buffer ? If so, resize. */
1101
1102                         if (*start == *size) {
1103                                 long int newsize;
1104                                 gid_t *newgroups;
1105
1106                                 newsize = 2 * (*size);
1107                                 if (limit > 0) {
1108                                         if (*size == limit) {
1109                                                 goto done;
1110                                         }
1111                                         if (newsize > limit) {
1112                                                 newsize = limit;
1113                                         }
1114                                 }
1115
1116                                 newgroups = (gid_t *)
1117                                         realloc((*groups),
1118                                                 newsize * sizeof(**groups));
1119                                 if (!newgroups) {
1120                                         *errnop = ENOMEM;
1121                                         ret = NSS_STATUS_NOTFOUND;
1122                                         goto done;
1123                                 }
1124                                 *groups = newgroups;
1125                                 *size = newsize;
1126                         }
1127
1128                         /* Add to buffer */
1129
1130                         (*groups)[*start] = gid_list[i];
1131                         *start += 1;
1132                 }
1133         }
1134
1135         /* Back to your regularly scheduled programming */
1136
1137  done:
1138 #ifdef DEBUG_NSS
1139         fprintf(stderr, "[%5d]: initgroups %s returns %s (%d)\n", getpid(),
1140                 user, nss_err_str(ret), ret);
1141 #endif
1142
1143 #ifdef HAVE_PTHREAD
1144         pthread_mutex_unlock(&winbind_nss_mutex);
1145 #endif
1146
1147         return ret;
1148 }