mdw@git.distorted.org.uk Git - become/blob - src/userdb.c

   1 /* -*-c-*-
   2  *
   3  * $Id: userdb.c,v 1.4 1997/08/20 16:24:58 mdw Exp $
   4  *
   5  * User database management
   6  *
   7  * (c) 1997 EBI
   8  */
   9
  10 /*----- Licensing notice --------------------------------------------------*
  11  *
  12  * This file is part of `become'
  13  *
  14  * `Become' is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2 of the License, or
  17  * (at your option) any later version.
  18  *
  19  * `Become' is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with `become'; if not, write to the Free Software Foundation,
  26  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  27  */
  28
  29 /*----- Revision history --------------------------------------------------*
  30  *
  31  * $Log: userdb.c,v $
  32  * Revision 1.4  1997/08/20 16:24:58  mdw
  33  * Patch memory leak.  Rename `userdb_reinit' to `userdb_end' for more
  34  * sensible restart.
  35  *
  36  * Revision 1.3  1997/08/07 09:44:29  mdw
  37  * Read NIS-based passwords from the YP server directly, rather than using
  38  * `popen(ypcat)', which is probably both slower and less secure.
  39  *
  40  * Revision 1.2  1997/08/04 10:24:26  mdw
  41  * Sources placed under CVS control.
  42  *
  43  * Revision 1.1  1997/07/21  13:47:43  mdw
  44  * Initial revision
  45  *
  46  */
  47
  48 /*----- Header files ------------------------------------------------------*/
  49
  50 /* --- ANSI headers --- */
  51
  52 #include <ctype.h>
  53 #include <errno.h>
  54 #include <stdio.h>
  55 #include <stdlib.h>
  56 #include <string.h>
  57
  58 /* --- Unix headers --- */
  59
  60 #include "config.h"
  61
  62 #include <sys/types.h>
  63
  64 #ifdef HAVE_YP
  65 #  include <rpc/rpc.h>
  66 #  include <rpcsvc/ypclnt.h>
  67 #  include <rpcsvc/yp_prot.h>
  68 #endif
  69
  70 #include <grp.h>
  71 #include <pwd.h>
  72 #include <unistd.h>
  73
  74 /* --- Local headers --- */
  75
  76 #include "become.h"
  77 #include "sym.h"
  78 #include "userdb.h"
  79 #include "utils.h"
  80
  81 /*----- Type definitions --------------------------------------------------*/
  82
  83 /* --- A map link --- */
  84
  85 typedef struct userdb__node {
  86   struct userdb__node *next;
  87   void *rec;
  88 } userdb__node;
  89
  90 /* --- A reference to a real record --- */
  91
  92 typedef struct userdb__sym {
  93   sym_base _base;
  94   void *rec;
  95 } userdb__sym;
  96
  97 /* --- A name- and number-mapping --- */
  98
  99 typedef struct userdb__map {
 100   sym_table nmap;
 101   sym_table idmap;
 102   userdb__node *list;
 103 } userdb__map;
 104
 105 /*----- Static variables --------------------------------------------------*/
 106
 107 static userdb__map userdb__users;       /* Map of user info blocks */
 108 static sym_iter userdb__useri;          /* Iterator for users */
 109 static userdb__map userdb__groups;      /* Map of group info blocks */
 110 static sym_iter userdb__groupi;         /* Iterator for groups */
 111
 112 /*----- Map management functions ------------------------------------------*/
 113
 114 /* --- @userdb__createMap@ --- *
 115  *
 116  * Arguments:   @userdb__map *m@ = pointer to a map block
 117  *
 118  * Returns:     ---
 119  *
 120  * Use:         Initialises a map table.
 121  */
 122
 123 static void userdb__createMap(userdb__map *m)
 124 {
 125   sym_createTable(&m->nmap);
 126   sym_createTable(&m->idmap);
 127   m->list = 0;
 128 }
 129
 130 /* --- @userdb__addToMap@ --- *
 131  *
 132  * Arguments:   @userdb__map *m@ = pointer to the map block
 133  *              @const char *name@ = pointer to the item's name
 134  *              @int id@ = the item's id number
 135  *              @void *rec@ = pointer to the actual record
 136  *
 137  * Returns:     ---
 138  *
 139  * Use:         Adds an item to the given map.
 140  */
 141
 142 static void userdb__addToMap(userdb__map *m,
 143                              const char *name,
 144                              int id, void *rec)
 145 {
 146   unsigned f;
 147   userdb__sym *s;
 148   userdb__node *n;
 149
 150   s = sym_find(&m->nmap, name, -1, sizeof(*s), &f);
 151   if (!f)
 152     s->rec = rec;
 153
 154   s = sym_find(&m->idmap, (char *)&id, sizeof(id), sizeof(*s), &f);
 155   if (!f)
 156     s->rec = rec;
 157
 158   n = xmalloc(sizeof(*n));
 159   n->rec = rec;
 160   n->next = m->list;
 161   m->list = n;
 162 }
 163
 164 /* --- @userdb__byName@ --- *
 165  *
 166  * Arguments:   @userdb__map *m@ = pointer to a map block
 167  *              @const char *name@ = name to look up
 168  *
 169  * Returns:     A pointer to the appropriate block, or zero if not found.
 170  *
 171  * Use:         Looks up a name in a mapping and returns the result.
 172  */
 173
 174 static void *userdb__byName(userdb__map *m, const char *name)
 175 {
 176   userdb__sym *s = sym_find(&m->nmap, name, -1, 0, 0);
 177   return (s ? s->rec : 0);
 178 }
 179
 180 /* --- @userdb__byId@ --- *
 181  *
 182  * Arguments:   @userdb__map *m@ = pointer to a map block
 183  *              @int id@ = id number to find
 184  *
 185  * Returns:     A pointer to the appropriate block, or zero if not found.
 186  *
 187  * Use:         Looks up an ID in a mapping, and returns the result.
 188  */
 189
 190 static void *userdb__byId(userdb__map *m, int id)
 191 {
 192   userdb__sym *s = sym_find(&m->idmap, (char *)&id, sizeof(id), 0, 0);
 193   return (s ? s->rec : 0);
 194 }
 195
 196 /* --- @userdb__clearMap@ --- *
 197  *
 198  * Arguments:   @userdb__map *m@ = pointer to a map block
 199  *              @void (*freerec)(void *rec)@ = pointer to a free-record proc
 200  *
 201  * Returns:     ---
 202  *
 203  * Use:         Clears a map, emptying it and releasing the memory it
 204  *              occupied.
 205  */
 206
 207 static void userdb__clearMap(userdb__map *m, void (*freerec)(void *rec))
 208 {
 209   userdb__node *n, *t;
 210
 211   sym_destroyTable(&m->nmap);
 212   sym_destroyTable(&m->idmap);
 213
 214   for (n = m->list; n; n = t) {
 215     t = n->next;
 216     freerec(n->rec);
 217     free(n);
 218   }
 219 }
 220
 221 /*----- User and group block management -----------------------------------*/
 222
 223 /* --- @userdb__dumpUser@ --- *
 224  *
 225  * Arguments:   @const struct passwd *pw@ = pointer to a user block
 226  *
 227  * Returns:     ---
 228  *
 229  * Use:         Writes a user's informationt to a stream.
 230  */
 231
 232 #ifdef TRACING
 233
 234 static void userdb__dumpUser(const struct passwd *pw)
 235 {
 236   trace(TRACE_DEBUG,
 237         "debug: name `%s' passwd `%s' uid %i gid %i",
 238         pw->pw_name, pw->pw_passwd, (int)pw->pw_uid, (int)pw->pw_gid);
 239   trace(TRACE_DEBUG,
 240         "debug: ... gecos `%s' home `%s' shell `%s'",
 241         pw->pw_gecos, pw->pw_dir, pw->pw_shell);
 242 }
 243
 244 #endif
 245
 246 /* --- @userdb_copyUser@ --- *
 247  *
 248  * Arguments:   @struct passwd *pw@ = pointer to block to copy
 249  *
 250  * Returns:     Pointer to the copy.
 251  *
 252  * Use:         Copies a user block.  The copy is `deep' so all the strings
 253  *              are copied too.  Free the copy with @userdb_freeUser@ when
 254  *              you don't want it any more.
 255  */
 256
 257 struct passwd *userdb_copyUser(struct passwd *pw)
 258 {
 259   struct passwd *npw;
 260
 261   if (!pw)
 262     return (0);
 263
 264   npw = xmalloc(sizeof(*npw));
 265
 266   npw->pw_name = xstrdup(pw->pw_name);
 267   npw->pw_passwd = xstrdup(pw->pw_passwd);
 268   npw->pw_uid = pw->pw_uid;
 269   npw->pw_gid = pw->pw_gid;
 270   npw->pw_gecos = xstrdup(pw->pw_gecos);
 271   npw->pw_dir = xstrdup(pw->pw_dir);
 272   npw->pw_shell = xstrdup(pw->pw_shell);
 273
 274   return (npw);
 275 }
 276
 277 /* --- @userdb__buildUser@ --- *
 278  *
 279  * Arguments:   @char *s@ = pointer to user string
 280  *
 281  * Returns:     Pointer to a user block.
 282  *
 283  * Use:         Converts a line from a user file into a password entry.
 284  *              Note that the string is corrupted by @strtok@ while it gets
 285  *              parsed.
 286  */
 287
 288 static struct passwd *userdb__buildUser(char *s)
 289 {
 290   struct passwd *pw = xmalloc(sizeof(*pw));
 291
 292   s = strtok(s, ":"); if (!s) goto tidy_0; pw->pw_name = xstrdup(s);
 293   s = strtok(0, ":"); if (!s) goto tidy_1; pw->pw_passwd = xstrdup(s);
 294   s = strtok(0, ":"); if (!s) goto tidy_2; pw->pw_uid = atoi(s);
 295   s = strtok(0, ":"); if (!s) goto tidy_2; pw->pw_gid = atoi(s);
 296   s = strtok(0, ":"); if (!s) goto tidy_2; pw->pw_gecos = xstrdup(s);
 297   s = strtok(0, ":"); if (!s) goto tidy_3; pw->pw_dir = xstrdup(s);
 298   s = strtok(0, ":"); if (!s) goto tidy_4; pw->pw_shell = xstrdup(s);
 299   return (pw);
 300
 301   /* --- Error handling --- */
 302
 303 tidy_4:
 304   free(pw->pw_dir);
 305 tidy_3:
 306   free(pw->pw_gecos);
 307 tidy_2:
 308   free(pw->pw_passwd);
 309 tidy_1:
 310   free(pw->pw_name);
 311 tidy_0:
 312   free(pw);
 313
 314   return (0);
 315 }
 316
 317 /* --- @userdb_freeUser@ --- *
 318  *
 319  * Arguments:   @void *rec@ = pointer to a user record
 320  *
 321  * Returns:     ---
 322  *
 323  * Use:         Frees a user record.
 324  */
 325
 326 void userdb_freeUser(void *rec)
 327 {
 328   struct passwd *pw;
 329
 330   if (!rec)
 331     return;
 332
 333   pw = rec;
 334   free(pw->pw_name);
 335   free(pw->pw_passwd);
 336   free(pw->pw_gecos);
 337   free(pw->pw_dir);
 338   free(pw->pw_shell);
 339   free(pw);
 340 }
 341
 342 /* --- @userdb__dumpGroup@ --- *
 343  *
 344  * Arguments:   @const struct group *gr@ = pointer to a group block
 345  *              @FILE *fp@ = pointer to stream to write on
 346  *
 347  * Returns:     ---
 348  *
 349  * Use:         Writes a group's information to a stream.
 350  */
 351
 352 #ifdef TRACING
 353
 354 static void userdb__dumpGroup(const struct group *gr)
 355 {
 356   char *const *p;
 357
 358   trace(TRACE_DEBUG,
 359          "debug: name `%s' passwd `%s' gid %i",
 360          gr->gr_name, gr->gr_passwd, (int)gr->gr_gid);
 361   for (p = gr->gr_mem; *p; p++)
 362     trace(TRACE_DEBUG,"debug: ... `%s'", *p);
 363 }
 364
 365 #endif
 366
 367 /* --- @userdb_copyGroup@ --- *
 368  *
 369  * Arguments:   @struct group *gr@ = pointer to group block
 370  *
 371  * Returns:     Pointer to copied block
 372  *
 373  * Use:         Copies a group block.  The copy is `deep' so all the strings
 374  *              are copied too.  Free the copy with @userdb_freeGroup@ when
 375  *              you don't want it any more.
 376  */
 377
 378 struct group *userdb_copyGroup(struct group *gr)
 379 {
 380   struct group *ngr;
 381   int i, max;
 382
 383   if (!gr)
 384     return (0);
 385
 386   ngr = xmalloc(sizeof(*ngr));
 387
 388   ngr->gr_name = xstrdup(gr->gr_name);
 389   ngr->gr_passwd = xstrdup(gr->gr_passwd);
 390   ngr->gr_gid = gr->gr_gid;
 391
 392   for (max = 0; gr->gr_mem[max]; max++)
 393     ;
 394   ngr->gr_mem = xmalloc((max + 1) * sizeof(char *));
 395   for (i = 0; i < max; i++)
 396     ngr->gr_mem[i] = xstrdup(gr->gr_mem[i]);
 397   ngr->gr_mem[max] = 0;
 398
 399   return (ngr);
 400 }
 401
 402 /* --- @userdb__buildGroup@ --- *
 403  *
 404  * Arguments:   @char *s@ = pointer to group line string
 405  *
 406  * Returns:     Pointer to a group block
 407  *
 408  * Use:         Parses an entry in the groups file.  The string is garbled
 409  *              by @strtok@ as we go.
 410  */
 411
 412 static struct group *userdb__buildGroup(char *s)
 413 {
 414   struct group *gr = xmalloc(sizeof(*gr));
 415   char *p;
 416   int i;
 417
 418   /* --- Do the easy bits --- */
 419
 420   s = strtok(s, ":"); if (!s) goto tidy_0; gr->gr_name = xstrdup(s);
 421   s = strtok(0, ":"); if (!s) goto tidy_1; gr->gr_passwd = xstrdup(s);
 422   s = strtok(0, ":"); if (!s) goto tidy_2; gr->gr_gid = atoi(s);
 423
 424   /* --- Find the start of the member list --- */
 425
 426   s = strtok(0, "");
 427   if (!s)
 428     goto tidy_2;
 429
 430   /* --- Count the number of members --- */
 431
 432   p = s;
 433   i = 0;
 434   for (;;) {
 435     i++;
 436     if ((p = strpbrk(p, ",")) == 0)
 437       break;
 438     p++;
 439   }
 440
 441   /* --- Allocate the block and fill it --- */
 442
 443   gr->gr_mem = xmalloc((i + 1) * sizeof(char *));
 444   i = 0;
 445   s = strtok(s, ",");
 446   do {
 447     gr->gr_mem[i++] = xstrdup(s);
 448     s = strtok(0, ",");
 449   } while (s);
 450   gr->gr_mem[i] = 0;
 451
 452   return (gr);
 453
 454   /* --- Various tidying-up things --- */
 455
 456 tidy_2:
 457   free(gr->gr_passwd);
 458 tidy_1:
 459   free(gr->gr_name);
 460 tidy_0:
 461   free(gr);
 462
 463   return (0);
 464 }
 465
 466 /* --- @userdb_freeGroup@ --- *
 467  *
 468  * Arguments:   @void *rec@ = pointer to a group record
 469  *
 470  * Returns:     ---
 471  *
 472  * Use:         Frees a group record.
 473  */
 474
 475 void userdb_freeGroup(void *rec)
 476 {
 477   struct group *gr;
 478   char **p;
 479
 480   if (!rec)
 481     return;
 482
 483   gr = rec;
 484   free(gr->gr_name);
 485   free(gr->gr_passwd);
 486   for (p = gr->gr_mem; *p; p++)
 487     free(*p);
 488   free(gr->gr_mem);
 489   free(gr);
 490 }
 491
 492 /*----- Answering queries -------------------------------------------------*/
 493
 494 /* --- @userdb_userByName@, @userdb_userById@ --- *
 495  *
 496  * Arguments:   @const char *name@ = pointer to user's name
 497  *              @uid_t id@ = user id to find
 498  *
 499  * Returns:     Pointer to user block, or zero if not found.
 500  *
 501  * Use:         Looks up a user by name or id.
 502  */
 503
 504 struct passwd *userdb_userByName(const char *name)
 505 { return (userdb__byName(&userdb__users, name)); }
 506
 507 struct passwd *userdb_userById(uid_t id)
 508 { return (userdb__byId(&userdb__users, id)); }
 509
 510 /* --- @userdb_iterateUsers@, @userdb_iterateUsers_r@ --- *
 511  *
 512  * Arguments:   @userdb_iter *i@ = pointer to a symbol table iterator object
 513  *
 514  * Returns:     ---
 515  *
 516  * Use:         Initialises an iteration for the user database.
 517  */
 518
 519 void userdb_iterateUsers(void)
 520 { userdb_iterateUsers_r(&userdb__useri); }
 521
 522 void userdb_iterateUsers_r(userdb_iter *i)
 523 { sym_createIter(i, &userdb__users.nmap); }
 524
 525 /* --- @userdb_nextUser@, @userdb_nextUser_r@ --- *
 526  *
 527  * Arguments:   @userdb_iter *i@ = pointer to a symbol table iterator oject
 528  *
 529  * Returns:     Pointer to the next user block, or null.
 530  *
 531  * Use:         Returns another user block.
 532  */
 533
 534 struct passwd *userdb_nextUser(void)
 535 { return (userdb_nextUser_r(&userdb__useri)); }
 536
 537 struct passwd *userdb_nextUser_r(userdb_iter *i)
 538 {
 539   userdb__sym *s = sym_next(i);
 540   return (s ? s->rec : 0);
 541 }
 542
 543 /* --- @userdb_groupByName@, @userdb_groupById@ --- *
 544  *
 545  * Arguments:   @const char *name@ = pointer to group's name
 546  *              @gid_t id@ = group id to find
 547  *
 548  * Returns:     Pointer to group block, or zero if not found.
 549  *
 550  * Use:         Looks up a group by name or id.
 551  */
 552
 553 struct group *userdb_groupByName(const char *name)
 554 { return (userdb__byName(&userdb__groups, name)); }
 555
 556 struct group *userdb_groupById(gid_t id)
 557 { return (userdb__byId(&userdb__groups, id)); }
 558
 559 /* --- @userdb_iterateGroups@, @userdb_iterateGroups_r@ --- *
 560  *
 561  * Arguments:   @userdb_iter *i@ = pointer to a symbol table iterator object
 562  *
 563  * Returns:     ---
 564  *
 565  * Use:         Initialises an iteration for the group database.
 566  */
 567
 568 void userdb_iterateGroups(void)
 569 { userdb_iterateGroups_r(&userdb__groupi); }
 570
 571 void userdb_iterateGroups_r(userdb_iter *i)
 572 { sym_createIter(i, &userdb__groups.nmap); }
 573
 574 /* --- @userdb_nextGroup@, @userdb_nextGroup_r@ --- *
 575  *
 576  * Arguments:   @userdb_iter *i@ = pointer to a symbol table iterator oject
 577  *
 578  * Returns:     Pointer to the next group block, or null.
 579  *
 580  * Use:         Returns another group block.
 581  */
 582
 583 struct group *userdb_nextGroup(void)
 584 { return (userdb_nextGroup_r(&userdb__groupi)); }
 585
 586 struct group *userdb_nextGroup_r(userdb_iter *i)
 587 {
 588   userdb__sym *s = sym_next(i);
 589   return (s ? s->rec : 0);
 590 }
 591
 592 /*----- Yellow pages support ----------------------------------------------*/
 593
 594 #ifdef HAVE_YP
 595
 596 /* --- @userdb__foreachUser@ --- *
 597  *
 598  * Arguments:   @int st@ = YP protocol-level status code
 599  *              @char *k@ = address of the key for this record
 600  *              @int ksz@ = size of the key
 601  *              @char *v@ = address of the value for this record
 602  *              @int vsz@ = size of the value
 603  *              @char *data@ = pointer to some data passed to me
 604  *
 605  * Returns:     Zero to be called again, nonzero to end the enumeration.
 606  *
 607  * Use:         Handles an incoming user record.
 608  */
 609
 610 static int userdb__foreachUser(int st, char *k, int ksz,
 611                                char *v, int vsz, char *data)
 612 {
 613   char *cv;
 614   struct passwd *pw;
 615
 616   if (st != YP_TRUE)
 617     return (-1);
 618   cv = xmalloc(vsz + 1);
 619   memcpy(cv, v, vsz);
 620   cv[vsz] = 0;
 621   T( trace(TRACE_DEBUG, "debug: nis string: `%s'", cv); )
 622   pw = userdb__buildUser(cv);
 623   if (pw && !userdb__byName(&userdb__users, pw->pw_name)) {
 624     IF_TRACING(TRACE_DEBUG, userdb__dumpUser(pw); )
 625     userdb__addToMap(&userdb__users, pw->pw_name, pw->pw_uid, pw);
 626   } else
 627     userdb_freeUser(pw);
 628   free(cv);
 629   return (0);
 630 }
 631
 632 /* --- @userdb__foreachGroup@ --- *
 633  *
 634  * Arguments:   @int st@ = YP protocol-level status code
 635  *              @char *k@ = address of the key for this record
 636  *              @int ksz@ = size of the key
 637  *              @char *v@ = address of the value for this record
 638  *              @int vsz@ = size of the value
 639  *              @char *data@ = pointer to some data passed to me
 640  *
 641  * Returns:     Zero to be called again, nonzero to end the enumeration.
 642  *
 643  * Use:         Handles an incoming user record.
 644  */
 645
 646 static int userdb__foreachGroup(int st, char *k, int ksz,
 647                                 char *v, int vsz, char *data)
 648 {
 649   char *cv;
 650   struct group *gr;
 651
 652   if (st != YP_TRUE)
 653     return (-1);
 654   cv = xmalloc(vsz + 1);
 655   memcpy(cv, v, vsz);
 656   cv[vsz] = 0;
 657   T( trace(TRACE_DEBUG, "debug: nis string: `%s'", cv); )
 658   gr = userdb__buildGroup(cv);
 659   if (gr && !userdb__byName(&userdb__groups, gr->gr_name)) {
 660     IF_TRACING(TRACE_DEBUG, userdb__dumpGroup(gr); )
 661     userdb__addToMap(&userdb__groups, gr->gr_name, gr->gr_gid, gr);
 662   } else
 663     userdb_freeGroup(gr);
 664   free(cv);
 665   return (0);
 666 }
 667
 668 /* --- @userdb_yp@ --- *
 669  *
 670  * Arguments:   ---
 671  *
 672  * Returns:     ---
 673  *
 674  * Use:         Fetches the YP database of users.
 675  */
 676
 677 void userdb_yp(void)
 678 {
 679   char *ypdom;
 680
 681   /* --- Bind to a server --- */
 682
 683   if (yp_get_default_domain(&ypdom) ||
 684       yp_bind(ypdom))
 685     return;
 686
 687   T( trace(TRACE_DEBUG, "debug: adding NIS users"); )
 688
 689   /* --- Fetch the users map --- */
 690
 691   {
 692     static struct ypall_callback ucb = { userdb__foreachUser, 0 };
 693     yp_all(ypdom, "passwd.byuid", &ucb);
 694   }
 695
 696   /* --- Fetch the groups map --- */
 697
 698   {
 699     static struct ypall_callback gcb = { userdb__foreachGroup, 0 };
 700     yp_all(ypdom, "group.bygid", &gcb);
 701   }
 702
 703   yp_unbind(ypdom);
 704 }
 705
 706 #else
 707
 708 void userdb_yp(void) { ; }
 709
 710 #endif
 711
 712 /*----- Building the databases --------------------------------------------*/
 713
 714 /* --- @userdb_local@ --- *
 715  *
 716  * Arguments:   ---
 717  *
 718  * Returns:     ---
 719  *
 720  * Use:         Reads the local list of users into the maps.
 721  */
 722
 723 void userdb_local(void)
 724 {
 725   T( trace(TRACE_DEBUG, "debug: adding local users"); )
 726
 727   /* --- Fetch users first --- */
 728
 729   {
 730     struct passwd *pw;
 731
 732     setpwent();
 733     while ((pw = getpwent()) != 0) {
 734       IF_TRACING(TRACE_DEBUG, userdb__dumpUser(pw); )
 735       if (!userdb__byName(&userdb__users, pw->pw_name))
 736         userdb__addToMap(&userdb__users, pw->pw_name, pw->pw_uid,
 737                          userdb_copyUser(pw));
 738     }
 739     endpwent();
 740   }
 741
 742   /* --- Then fetch groups --- */
 743
 744   {
 745     struct group *gr;
 746
 747     setgrent();
 748     while ((gr = getgrent()) != 0) {
 749       IF_TRACING(TRACE_DEBUG, userdb__dumpGroup(gr); )
 750       if (!userdb__byName(&userdb__groups, gr->gr_name))
 751         userdb__addToMap(&userdb__groups, gr->gr_name, gr->gr_gid,
 752                          userdb_copyGroup(gr));
 753     }
 754     endgrent();
 755   }
 756 }
 757
 758 /* --- @userdb_init@ --- *
 759  *
 760  * Arguments:   ---
 761  *
 762  * Returns:     ---
 763  *
 764  * Use:         Initialises the user database.
 765  */
 766
 767 void userdb_init(void)
 768 {
 769   userdb__createMap(&userdb__users);
 770   userdb__createMap(&userdb__groups);
 771 }
 772
 773 /* --- @userdb_end@ --- *
 774  *
 775  * Arguments:   ---
 776  *
 777  * Returns:     ---
 778  *
 779  * Use:         Closes down the user database.
 780  */
 781
 782 void userdb_end(void)
 783 {
 784   userdb__clearMap(&userdb__users, userdb_freeUser);
 785   userdb__clearMap(&userdb__groups, userdb_freeGroup);
 786 }
 787
 788 /*----- Test rig ----------------------------------------------------------*/
 789
 790 #ifdef TEST_RIG
 791
 792 void dumpit(const char *msg)
 793 {
 794   trace(TRACE_DEBUG, "debug: %s", msg);
 795
 796   {
 797     struct passwd *pw;
 798     for (userdb_iterateUsers(); (pw = userdb_nextUser()) != 0; )
 799       userdb__dumpUser(pw);
 800   }
 801
 802   {
 803     struct group *gr;
 804     for (userdb_iterateGroups(); (gr = userdb_nextGroup()) != 0; )
 805       userdb__dumpGroup(gr);
 806   }
 807 }
 808
 809 int main(void)
 810 {
 811   ego("userdb-test");
 812 /*   traceon(stdout, TRACE_ALL); */
 813   userdb_init();
 814   userdb_local();
 815   userdb_yp();
 816   printf("loaded (%lu)\n", track_memused());
 817   getchar();
 818   for (;;) {
 819     userdb_end();
 820     printf("cleared (%lu)\n", track_memused());
 821 /*    track_memlist(); */
 822     userdb_init();
 823     userdb_local();
 824     userdb_yp();
 825     printf("reloaded (%lu)\n", track_memused());
 826     getchar();
 827   }
 828   return (0);
 829 }
 830
 831 #endif
 832
 833 /*----- That's all, folks -------------------------------------------------*/