git.sur5r.net Git - openldap/blob - servers/slapd/overlays/pcache.c

   1 /* $OpenLDAP$ */
   2 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   3  *
   4  * Copyright 2003 The OpenLDAP Foundation.
   5  * Portions Copyright 2003 IBM Corporation.
   6  * Portions Copyright 2003 Symas Corporation.
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted only as authorized by the OpenLDAP
  11  * Public License.
  12  *
  13  * A copy of this license is available in the file LICENSE in the
  14  * top-level directory of the distribution or, alternatively, at
  15  * <http://www.OpenLDAP.org/license.html>.
  16  */
  17 /* ACKNOWLEDGEMENTS:
  18  * This work was initially developed by Apurva Kumar for inclusion
  19  * in OpenLDAP Software.
  20  *
  21  * This work was rewritten by Howard Chu for OpenLDAP.
  22  */
  23
  24 #include "portable.h"
  25
  26 #ifdef SLAPD_OVER_PROXYCACHE
  27
  28 #include <stdio.h>
  29
  30 #include <ac/string.h>
  31 #include <ac/time.h>
  32
  33 #include "slap.h"
  34 #include "ldap_pvt.h"
  35 #include "lutil.h"
  36
  37 /* query cache structs */
  38 /* query */
  39
  40 typedef struct Query_s {
  41         Filter*         filter;         /* Search Filter */
  42         AttributeName*  attrs;          /* Projected attributes */
  43         struct berval   base;           /* Search Base */
  44         int             scope;          /* Search scope */
  45 } Query;
  46
  47 /* struct representing a cached query */
  48 typedef struct cached_query_s {
  49         Query                           query;          /* LDAP query */
  50         struct berval                   q_uuid;         /* query identifier */
  51         int                             template_id;    /* template of the query */
  52         time_t                          expiry_time;    /* time till the query is considered valid */
  53         struct cached_query_s           *next;          /* next query in the template */
  54         struct cached_query_s           *prev;          /* previous query in the template */
  55         struct cached_query_s           *lru_up;        /* previous query in the LRU list */
  56         struct cached_query_s           *lru_down;      /* next query in the LRU list */
  57 } CachedQuery;
  58
  59 /* struct representing a query template
  60  * e.g. template string = &(cn=)(mail=)
  61  */
  62 typedef struct query_template_s {
  63         struct berval   querystr;       /* Filter string corresponding to the QT */
  64         int             attr_set_index; /* determines the projected attributes */
  65
  66         CachedQuery*    query;          /* most recent query cached for the template */
  67         CachedQuery*    query_last;     /* oldest query cached for the template */
  68
  69         int             no_of_queries;  /* Total number of queries in the template */
  70         long            ttl;            /* TTL for the queries of this template */
  71         ldap_pvt_thread_rdwr_t t_rwlock; /* Rd/wr lock for accessing queries in the template */
  72 } QueryTemplate;
  73
  74 /*
  75  * Represents a set of projected attributes and any
  76  * supersets among all specified sets of attributes.
  77  */
  78
  79 struct attr_set {
  80         AttributeName*  attrs;          /* specifies the set */
  81         int             count;          /* number of attributes */
  82         int*            ID_array;       /* array of indices of supersets of 'attrs' */
  83 };
  84
  85 struct query_manager_s;
  86
  87 /* prototypes for functions for 1) query containment
  88  * 2) query addition, 3) cache replacement
  89  */
  90 typedef int     (QCfunc)(struct query_manager_s*, Query*, int );
  91 typedef void    (AddQueryfunc)(struct query_manager_s*, Query*, int, struct berval*);
  92 typedef void    (CRfunc)(struct query_manager_s*, struct berval * );
  93
  94 /* LDAP query cache */
  95 typedef struct query_manager_s {
  96         struct attr_set*        attr_sets;              /* possible sets of projected attributes */
  97         QueryTemplate*          templates;              /* cacheable templates */
  98
  99         CachedQuery*            lru_top;                /* top and bottom of LRU list */
 100         CachedQuery*            lru_bottom;
 101
 102         ldap_pvt_thread_mutex_t         lru_mutex;      /* mutex for accessing LRU list */
 103
 104         /* Query cache methods */
 105         QCfunc                  *qcfunc;                        /* Query containment*/
 106         CRfunc                  *crfunc;                        /* cache replacement */
 107         AddQueryfunc    *addfunc;                       /* add query */
 108 } query_manager;
 109
 110 /* LDAP query cache manager */
 111 typedef struct cache_manager_s {
 112         BackendInfo *bi;        /* underlying database info */
 113         void *be_private;       /* for the underlying database */
 114         unsigned long   num_cached_queries;             /* total number of cached queries */
 115         unsigned long   max_queries;                    /* upper bound on # of cached queries */
 116         int     numattrsets;                    /* number of attribute sets */
 117         int     numtemplates;                   /* number of cacheable templates */
 118         int     cur_entries;                    /* current number of entries cached */
 119         int     max_entries;                    /* max number of entries cached */
 120         int     num_entries_limit;              /* max # of entries in a cacheable query */
 121
 122         int     cc_period;              /* interval between successive consistency checks (sec) */
 123         int     cc_thread_started;
 124         ldap_pvt_thread_t   cc_thread;
 125
 126         ldap_pvt_thread_mutex_t         cache_mutex;
 127         ldap_pvt_thread_mutex_t         remove_mutex;
 128
 129         query_manager*   qm;    /* query cache managed by the cache manager */
 130 } cache_manager;
 131
 132 static AttributeDescription *ad_queryid;
 133 static char *queryid_schema = "( 1.3.6.1.4.1.4203.666.1.12 NAME 'queryid' "
 134                         "DESC 'list of queries the entry belongs to' "
 135                         "EQUALITY octetStringMatch "
 136                         "SYNTAX 1.3.6.1.4.1.1466.115.121.1.40{64} "
 137                         "NO-USER-MODIFICATION USAGE directoryOperation )";
 138
 139 static int
 140 merge_entry(
 141         Operation               *op,
 142         Entry                   *e,
 143         struct berval*          query_uuid )
 144 {
 145         int             rc;
 146         Modifications* modlist = NULL;
 147         const char*     text = NULL;
 148         Attribute               *attr;
 149         char                    textbuf[SLAP_TEXT_BUFLEN];
 150         size_t                  textlen = sizeof(textbuf);
 151
 152         SlapReply sreply = {REP_RESULT};
 153
 154         slap_callback cb = { slap_null_cb, NULL };
 155
 156         attr = e->e_attrs;
 157         e->e_attrs = NULL;
 158
 159         /* add queryid attribute */
 160         attr_merge_one( e, ad_queryid, query_uuid, NULL );
 161
 162         /* append the attribute list from the fetched entry */
 163         e->e_attrs->a_next = attr;
 164
 165         op->o_tag = LDAP_REQ_ADD;
 166         op->o_protocol = LDAP_VERSION3;
 167         op->o_callback = &cb;
 168         op->o_time = slap_get_time();
 169         op->o_do_not_cache = 1;
 170
 171         op->ora_e = e;
 172         rc = op->o_bd->be_add( op, &sreply );
 173
 174         if ( rc != LDAP_SUCCESS ) {
 175                 if ( rc == LDAP_ALREADY_EXISTS ) {
 176                         slap_entry2mods( e, &modlist, &text, textbuf, textlen );
 177                         modlist->sml_op = LDAP_MOD_ADD;
 178                         op->o_tag = LDAP_REQ_MODIFY;
 179                         op->orm_modlist = modlist;
 180                         op->o_req_dn = e->e_name;
 181                         op->o_req_ndn = e->e_nname;
 182                         rc = op->o_bd->be_modify( op, &sreply );
 183                         slap_mods_free( modlist );
 184                 } else if ( rc == LDAP_REFERRAL ||
 185                                         rc == LDAP_NO_SUCH_OBJECT ) {
 186                         syncrepl_add_glue( op, e );
 187                 } else {
 188                         rc = 0;
 189                 }
 190         }
 191
 192         return rc;
 193 }
 194
 195 /* compare base and scope of incoming and cached queries */
 196 static int base_scope_compare(
 197         struct berval* ndn_stored,
 198         struct berval* ndn_incoming,
 199         int scope_stored,
 200         int scope_incoming      )
 201 {
 202         struct berval pdn_incoming = { 0, NULL };
 203
 204         if (scope_stored < scope_incoming)
 205                 return 0;
 206
 207         if ( !dnIsSuffix(ndn_incoming, ndn_stored))
 208                 return 0;
 209
 210         switch(scope_stored) {
 211         case LDAP_SCOPE_BASE:
 212                 return (ndn_incoming->bv_len == ndn_stored->bv_len);
 213
 214         case LDAP_SCOPE_ONELEVEL:
 215                 switch(scope_incoming){
 216                 case LDAP_SCOPE_BASE:
 217                         dnParent(ndn_incoming, &pdn_incoming);
 218                         return (pdn_incoming.bv_len == ndn_stored->bv_len);
 219
 220                 case LDAP_SCOPE_ONELEVEL:
 221                         return (ndn_incoming->bv_len == ndn_stored->bv_len);
 222
 223                 default:
 224                         return 0;
 225                 }
 226         case LDAP_SCOPE_SUBTREE:
 227                 return 1;
 228                 break;
 229         default:
 230                 return 0;
 231                 break;
 232     }
 233 }
 234
 235 /* add query on top of LRU list */
 236 static void
 237 add_query_on_top (query_manager* qm, CachedQuery* qc)
 238 {
 239         CachedQuery* top = qm->lru_top;
 240         Query* q = (Query*)qc;
 241
 242         qm->lru_top = qc;
 243
 244         if (top)
 245                 top->lru_up = qc;
 246         else
 247                 qm->lru_bottom = qc;
 248
 249         qc->lru_down = top;
 250         qc->lru_up = NULL;
 251 #ifdef NEW_LOGGING
 252         LDAP_LOG( BACK_META, DETAIL1, "Base of added query = %s\n",
 253                         q->base.bv_val, 0, 0 );
 254 #else
 255         Debug( LDAP_DEBUG_ANY, "Base of added query = %s\n",
 256                         q->base.bv_val, 0, 0 );
 257 #endif
 258 }
 259
 260 /* remove_query from LRU list */
 261
 262 static void
 263 remove_query (query_manager* qm, CachedQuery* qc)
 264 {
 265         CachedQuery* up;
 266         CachedQuery* down;
 267
 268         if (!qc)
 269                 return;
 270
 271         up = qc->lru_up;
 272         down = qc->lru_down;
 273
 274         if (!up)
 275                 qm->lru_top = down;
 276
 277         if (!down)
 278                 qm->lru_bottom = up;
 279
 280         if (down)
 281                 down->lru_up = up;
 282
 283         if (up)
 284                 up->lru_down = down;
 285
 286         qc->lru_up = qc->lru_down = NULL;
 287 }
 288
 289 static void
 290 invert_string( struct berval *bv )
 291 {
 292         int i;
 293         char c;
 294
 295         for (i=0; i<bv->bv_len/2; i++) {
 296                 c = bv->bv_val[i];
 297                 bv->bv_val[i] = bv->bv_val[bv->bv_len-i-1];
 298                 bv->bv_val[bv->bv_len-i-1] = c;
 299         }
 300 }
 301
 302 /* find and remove string2 from string1
 303  * from start if position = 1,
 304  * from end if position = 3,
 305  * from anywhere if position = 2
 306  */
 307
 308 static int
 309 find_and_remove(struct berval* ber1, struct berval* ber2, int position)
 310 {
 311         char* temp;
 312         int len;
 313         int ret=0;
 314
 315         char* arg1, *arg2;
 316         char* string1=ber1->bv_val;
 317         char* string2=ber2->bv_val;
 318
 319         if (string2 == NULL)
 320                 return 1;
 321         if (string1 == NULL)
 322                 return 0;
 323
 324         if (position == 3) {
 325                 invert_string(ber1);
 326                 invert_string(ber2);
 327         }
 328
 329         arg1 = string1;
 330         arg2 = string2;
 331
 332         temp = strstr(arg1, arg2);
 333
 334         len = ber2->bv_len;
 335
 336         if ( temp && (position == 2 || temp == arg1) ) {
 337                 string1 = temp+len;
 338                 strcpy( arg1, string1 );
 339                 ber1->bv_len -= len;
 340                 ret = 1;
 341         }
 342         if ( position == 3 ) {
 343                 invert_string(ber1);
 344                 invert_string(ber2);
 345         }
 346         return ret;
 347 }
 348
 349
 350 static struct berval*
 351 merge_init_final(struct berval* init, struct berval* any, struct berval* final)
 352 {
 353         struct berval* merged, *temp;
 354         int i, any_count, count;
 355
 356         for (any_count=0; any && any[any_count].bv_val; any_count++)
 357                 ;
 358
 359         count = any_count;
 360
 361         if (init->bv_val)
 362                 count++;
 363         if (final->bv_val)
 364                 count++;
 365
 366         merged = (struct berval*)(ch_malloc((count+1)*sizeof(struct berval)));
 367         temp = merged;
 368
 369         if (init->bv_val) {
 370                 *temp++ = *init;
 371         }
 372
 373         for (i=0; i<any_count; i++) {
 374                 *temp++ = *any++;
 375         }
 376
 377         if (final->bv_val){
 378                 *temp++ = *final;
 379         }
 380         temp->bv_val = NULL;
 381         temp->bv_len = 0;
 382         return merged;
 383 }
 384
 385 static int
 386 strings_containment(struct berval* stored, struct berval* incoming)
 387 {
 388         struct berval* element;
 389         int k=0;
 390         int j, rc = 0;
 391
 392         for ( element=stored; element->bv_val != NULL; element++ ) {
 393                 for (j = k; incoming[j].bv_val != NULL; j++) {
 394                         if (find_and_remove(&(incoming[j]), element, 2)) {
 395                                 k = j;
 396                                 rc = 1;
 397                                 break;
 398                         }
 399                         rc = 0;
 400                 }
 401                 if ( rc ) {
 402                         continue;
 403                 } else {
 404                         return 0;
 405                 }
 406         }
 407         return 1;
 408 }
 409
 410 static int
 411 substr_containment_substr(Filter* stored, Filter* incoming)
 412 {
 413         int i;
 414         int rc = 0;
 415         int any_count = 0;
 416
 417         struct berval init_incoming;
 418         struct berval final_incoming;
 419         struct berval *any_incoming = NULL;
 420         struct berval *remaining_incoming = NULL;
 421
 422         if ((!(incoming->f_sub_initial.bv_val) && (stored->f_sub_initial.bv_val))
 423            || (!(incoming->f_sub_final.bv_val) && (stored->f_sub_final.bv_val)))
 424                 return 0;
 425
 426
 427         ber_dupbv(&init_incoming, &(incoming->f_sub_initial));
 428         ber_dupbv(&final_incoming, &(incoming->f_sub_final));
 429
 430         if (incoming->f_sub_any) {
 431                 for ( any_count=0; incoming->f_sub_any[any_count].bv_val != NULL;
 432                                 any_count++ )
 433                         ;
 434
 435                 any_incoming = (struct berval*)ch_malloc((any_count+1) *
 436                                                 sizeof(struct berval));
 437
 438                 for (i=0; i<any_count; i++) {
 439                         ber_dupbv(&(any_incoming[i]), &(incoming->f_sub_any[i]));
 440                 }
 441                 any_incoming[any_count].bv_val = NULL;
 442                 any_incoming[any_count].bv_len = 0;
 443         }
 444
 445         if (find_and_remove(&init_incoming,
 446                         &(stored->f_sub_initial), 1) && find_and_remove(&final_incoming,
 447                         &(stored->f_sub_final), 3))
 448         {
 449                 if (stored->f_sub_any == NULL) {
 450                         rc = 1;
 451                         goto final;
 452                 }
 453                 remaining_incoming = merge_init_final(&init_incoming,
 454                                                 any_incoming, &final_incoming);
 455                 rc = strings_containment(stored->f_sub_any, remaining_incoming);
 456         }
 457 final:
 458         free(init_incoming.bv_val);
 459         free(final_incoming.bv_val);
 460         if (any_incoming) ber_bvarray_free( any_incoming );
 461         free(remaining_incoming);
 462
 463         return rc;
 464 }
 465
 466 static int
 467 substr_containment_equality(Filter* stored, Filter* incoming)
 468 {
 469         struct berval incoming_val[2];
 470         int rc = 0;
 471
 472         ber_dupbv(incoming_val, &(incoming->f_av_value));
 473         incoming_val[1].bv_val = NULL;
 474         incoming_val[1].bv_len = 0;
 475
 476         if (find_and_remove(incoming_val,
 477                         &(stored->f_sub_initial), 1) && find_and_remove(incoming_val,
 478                         &(stored->f_sub_final), 3)) {
 479                 if (stored->f_sub_any == NULL){
 480                         rc = 1;
 481                         goto final;
 482                 }
 483                 rc = strings_containment(stored->f_sub_any, incoming_val);
 484         }
 485 final:
 486         free(incoming_val[0].bv_val);
 487         return rc;
 488 }
 489
 490 /* check whether query is contained in any of
 491  * the cached queries in template template_index
 492  */
 493 static int
 494 query_containment(query_manager *qm,
 495                   Query *query,
 496                   int template_index)
 497 {
 498         QueryTemplate* templa= qm->templates;
 499         CachedQuery* qc;
 500         Query* q;
 501         Filter* inputf = query->filter;
 502         struct berval* base = &(query->base);
 503         int scope = query->scope;
 504         int res=0;
 505         Filter* fs;
 506         Filter* fi;
 507         int ret, rc;
 508         const char* text;
 509
 510         MatchingRule* mrule = NULL;
 511         if (inputf != NULL) {
 512 #ifdef NEW_LOGGING
 513                 LDAP_LOG( BACK_META, DETAIL1, "Lock QC index = %d\n",
 514                                 template_index, 0, 0 );
 515 #else
 516                 Debug( LDAP_DEBUG_ANY, "Lock QC index = %d\n",
 517                                 template_index, 0, 0 );
 518 #endif
 519                 ldap_pvt_thread_rdwr_rlock(&(templa[template_index].t_rwlock));
 520                 for(qc=templa[template_index].query; qc != NULL; qc= qc->next) {
 521                         q = (Query*)qc;
 522                         if(base_scope_compare(&(q->base), base, q->scope, scope)) {
 523                                 fi = inputf;
 524                                 fs = q->filter;
 525                                 do {
 526                                         res=0;
 527                                         switch (fs->f_choice) {
 528                                         case LDAP_FILTER_EQUALITY:
 529                                                 if (fi->f_choice == LDAP_FILTER_EQUALITY)
 530                                                         mrule = fs->f_ava->aa_desc->ad_type->sat_equality;
 531                                                 else
 532                                                         ret = 1;
 533                                                 break;
 534                                         case LDAP_FILTER_GE:
 535                                         case LDAP_FILTER_LE:
 536                                                 mrule = fs->f_ava->aa_desc->ad_type->sat_ordering;
 537                                                 break;
 538                                         default:
 539                                                 mrule = NULL;
 540                                         }
 541                                         if (mrule) {
 542                                                 rc = value_match(&ret, fs->f_ava->aa_desc, mrule,
 543                                                         SLAP_MR_VALUE_OF_ASSERTION_SYNTAX,
 544                                                         &(fi->f_ava->aa_value),
 545                                                         &(fs->f_ava->aa_value), &text);
 546                                                 if (rc != LDAP_SUCCESS) {
 547                                                         ldap_pvt_thread_rdwr_runlock(&(templa[template_index].t_rwlock));
 548 #ifdef NEW_LOGGING
 549                                                         LDAP_LOG( BACK_META, DETAIL1,
 550                                                         "Unlock: Exiting QC index=%d\n",
 551                                                         template_index, 0, 0 );
 552 #else
 553                                                         Debug( LDAP_DEBUG_ANY,
 554                                                         "Unlock: Exiting QC index=%d\n",
 555                                                         template_index, 0, 0 );
 556 #endif
 557                                                         return 0;
 558                                                 }
 559                                         }
 560                                         switch (fs->f_choice) {
 561                                         case LDAP_FILTER_OR:
 562                                         case LDAP_FILTER_AND:
 563                                                 fs = fs->f_and;
 564                                                 fi = fi->f_and;
 565                                                 res=1;
 566                                                 break;
 567                                         case LDAP_FILTER_SUBSTRINGS:
 568                                                 /* check if the equality query can be
 569                                                 * answered with cached substring query */
 570                                                 if ((fi->f_choice == LDAP_FILTER_EQUALITY)
 571                                                         && substr_containment_equality(
 572                                                         fs, fi))
 573                                                         res=1;
 574                                                 /* check if the substring query can be
 575                                                 * answered with cached substring query */
 576                                                 if ((fi->f_choice ==LDAP_FILTER_SUBSTRINGS
 577                                                         ) && substr_containment_substr(
 578                                                         fs, fi))
 579                                                         res= 1;
 580                                                 fs=fs->f_next;
 581                                                 fi=fi->f_next;
 582                                                 break;
 583                                         case LDAP_FILTER_PRESENT:
 584                                                 res=1;
 585                                                 fs=fs->f_next;
 586                                                 fi=fi->f_next;
 587                                                 break;
 588                                         case LDAP_FILTER_EQUALITY:
 589                                                 if (ret == 0)
 590                                                         res = 1;
 591                                                 fs=fs->f_next;
 592                                                 fi=fi->f_next;
 593                                                 break;
 594                                         case LDAP_FILTER_GE:
 595                                                 if (ret >= 0)
 596                                                         res = 1;
 597                                                 fs=fs->f_next;
 598                                                 fi=fi->f_next;
 599                                                 break;
 600                                         case LDAP_FILTER_LE:
 601                                                 if (ret <= 0)
 602                                                         res = 1;
 603                                                 fs=fs->f_next;
 604                                                 fi=fi->f_next;
 605                                                 break;
 606                                         case LDAP_FILTER_NOT:
 607                                                 res=0;
 608                                                 break;
 609                                         default:
 610                                                 break;
 611                                         }
 612                                 } while((res) && (fi != NULL) && (fs != NULL));
 613
 614                                 if(res) {
 615                                         ldap_pvt_thread_mutex_lock(&qm->lru_mutex);
 616                                         if (qm->lru_top != qc) {
 617                                                 remove_query(qm, qc);
 618                                                 add_query_on_top(qm, qc);
 619                                         }
 620                                         ldap_pvt_thread_mutex_unlock(&qm->lru_mutex);
 621                                         return 1;
 622                                 }
 623                         }
 624                 }
 625 #ifdef NEW_LOGGING
 626                 LDAP_LOG( BACK_META, DETAIL1,
 627                         "Not answerable: Unlock QC index=%d\n",
 628                         template_index, 0, 0 );
 629 #else
 630                 Debug( LDAP_DEBUG_ANY,
 631                         "Not answerable: Unlock QC index=%d\n",
 632                         template_index, 0, 0 );
 633 #endif
 634                 ldap_pvt_thread_rdwr_runlock(&(templa[template_index].t_rwlock));
 635         }
 636         return 0;
 637 }
 638
 639 static void
 640 free_query (CachedQuery* qc)
 641 {
 642         Query* q = (Query*)qc;
 643         free(qc->q_uuid.bv_val);
 644         filter_free(q->filter);
 645         free (q->base.bv_val);
 646
 647         free(q->attrs);
 648         free(qc);
 649 }
 650
 651
 652 /* Add query to query cache */
 653 static void add_query(
 654         query_manager* qm,
 655         Query* query,
 656         int template_index,
 657         struct berval* uuid)
 658 {
 659         CachedQuery* new_cached_query = (CachedQuery*) ch_malloc(sizeof(CachedQuery));
 660         QueryTemplate* templ = (qm->templates)+template_index;
 661         Query* new_query;
 662         new_cached_query->template_id = template_index;
 663         new_cached_query->q_uuid = *uuid;
 664         new_cached_query->lru_up = NULL;
 665         new_cached_query->lru_down = NULL;
 666         new_cached_query->expiry_time = slap_get_time() + templ->ttl;
 667 #ifdef NEW_LOGGING
 668         LDAP_LOG( BACK_META, DETAIL1, "Added query expires at %ld\n",
 669                         (long) new_cached_query->expiry_time, 0, 0 );
 670 #else
 671         Debug( LDAP_DEBUG_ANY, "Added query expires at %ld\n",
 672                         (long) new_cached_query->expiry_time, 0, 0 );
 673 #endif
 674         new_query = (Query*)new_cached_query;
 675
 676         ber_dupbv(&new_query->base, &query->base);
 677         new_query->scope = query->scope;
 678         new_query->filter = query->filter;
 679         new_query->attrs = query->attrs;
 680
 681         /* Adding a query    */
 682 #ifdef NEW_LOGGING
 683         LDAP_LOG( BACK_META, DETAIL1, "Lock AQ index = %d\n",
 684                         template_index, 0, 0 );
 685 #else
 686         Debug( LDAP_DEBUG_ANY, "Lock AQ index = %d\n",
 687                         template_index, 0, 0 );
 688 #endif
 689         ldap_pvt_thread_rdwr_wlock(&templ->t_rwlock);
 690         if (templ->query == NULL)
 691                 templ->query_last = new_cached_query;
 692         else
 693                 templ->query->prev = new_cached_query;
 694         new_cached_query->next = templ->query;
 695         new_cached_query->prev = NULL;
 696         templ->query = new_cached_query;
 697         templ->no_of_queries++;
 698 #ifdef NEW_LOGGING
 699         LDAP_LOG( BACK_META, DETAIL1, "TEMPLATE %d QUERIES++ %d\n",
 700                         template_index, templ->no_of_queries, 0 );
 701 #else
 702         Debug( LDAP_DEBUG_ANY, "TEMPLATE %d QUERIES++ %d\n",
 703                         template_index, templ->no_of_queries, 0 );
 704 #endif
 705
 706 #ifdef NEW_LOGGING
 707         LDAP_LOG( BACK_META, DETAIL1, "Unlock AQ index = %d \n",
 708                         template_index, 0, 0 );
 709 #else
 710         Debug( LDAP_DEBUG_ANY, "Unlock AQ index = %d \n",
 711                         template_index, 0, 0 );
 712 #endif
 713         ldap_pvt_thread_rdwr_wunlock(&templ->t_rwlock);
 714
 715         /* Adding on top of LRU list  */
 716         ldap_pvt_thread_mutex_lock(&qm->lru_mutex);
 717         add_query_on_top(qm, new_cached_query);
 718         ldap_pvt_thread_mutex_unlock(&qm->lru_mutex);
 719 }
 720
 721 static void
 722 remove_from_template (CachedQuery* qc, QueryTemplate* template)
 723 {
 724         if (!qc->prev && !qc->next) {
 725                 template->query_last = template->query = NULL;
 726         } else if (qc->prev == NULL) {
 727                 qc->next->prev = NULL;
 728                 template->query = qc->next;
 729         } else if (qc->next == NULL) {
 730                 qc->prev->next = NULL;
 731                 template->query_last = qc->prev;
 732         } else {
 733                 qc->next->prev = qc->prev;
 734                 qc->prev->next = qc->next;
 735         }
 736
 737         template->no_of_queries--;
 738 }
 739
 740 /* remove bottom query of LRU list from the query cache */
 741 static void cache_replacement(query_manager* qm, struct berval *result)
 742 {
 743         CachedQuery* bottom;
 744         int temp_id;
 745
 746         ldap_pvt_thread_mutex_lock(&qm->lru_mutex);
 747         bottom = qm->lru_bottom;
 748
 749         result->bv_val = NULL;
 750         result->bv_len = 0;
 751
 752         if (!bottom) {
 753 #ifdef NEW_LOGGING
 754                 LDAP_LOG ( BACK_META, DETAIL1,
 755                         "Cache replacement invoked without "
 756                         "any query in LRU list\n", 0, 0, 0 );
 757 #else
 758                 Debug ( LDAP_DEBUG_ANY,
 759                         "Cache replacement invoked without "
 760                         "any query in LRU list\n", 0, 0, 0 );
 761 #endif
 762                 return;
 763         }
 764
 765         temp_id = bottom->template_id;
 766         remove_query(qm, bottom);
 767         ldap_pvt_thread_mutex_unlock(&qm->lru_mutex);
 768
 769         *result = bottom->q_uuid;
 770         bottom->q_uuid.bv_val = NULL;
 771
 772 #ifdef NEW_LOGGING
 773         LDAP_LOG( BACK_META, DETAIL1, "Lock CR index = %d\n", temp_id, 0, 0 );
 774 #else
 775         Debug( LDAP_DEBUG_ANY, "Lock CR index = %d\n", temp_id, 0, 0 );
 776 #endif
 777         ldap_pvt_thread_rdwr_wlock(&(qm->templates[temp_id].t_rwlock));
 778         remove_from_template(bottom, (qm->templates+temp_id));
 779 #ifdef NEW_LOGGING
 780         LDAP_LOG( BACK_META, DETAIL1, "TEMPLATE %d QUERIES-- %d\n",
 781                 temp_id, qm->templates[temp_id].no_of_queries, 0 );
 782 #else
 783         Debug( LDAP_DEBUG_ANY, "TEMPLATE %d QUERIES-- %d\n",
 784                 temp_id, qm->templates[temp_id].no_of_queries, 0 );
 785 #endif
 786 #ifdef NEW_LOGGING
 787         LDAP_LOG( BACK_META, DETAIL1, "Unlock CR index = %d\n", temp_id, 0, 0 );
 788 #else
 789         Debug( LDAP_DEBUG_ANY, "Unlock CR index = %d\n", temp_id, 0, 0 );
 790 #endif
 791         ldap_pvt_thread_rdwr_wunlock(&(qm->templates[temp_id].t_rwlock));
 792         free_query(bottom);
 793 }
 794
 795 struct query_info {
 796         struct berval*          uuid;
 797         int                     deleted;
 798 };
 799
 800 static int
 801 remove_func (
 802         Operation       *op,
 803         SlapReply       *rs
 804 )
 805 {
 806         struct query_info       *info = op->o_callback->sc_private;
 807         int                     count = 0;
 808         Modifications           mod;
 809         struct berval vals[2];
 810
 811         Attribute               *attr;
 812         Operation               op_tmp = *op;
 813
 814         SlapReply               sreply = {REP_RESULT};
 815
 816         if (rs->sr_type == REP_RESULT)
 817                 return 0;
 818
 819         for (attr = rs->sr_entry->e_attrs; attr!= NULL; attr = attr->a_next) {
 820                 if (attr->a_desc == ad_queryid) {
 821                         for (count=0; attr->a_vals[count].bv_val; count++)
 822                                 ;
 823                         break;
 824                 }
 825         }
 826
 827         if (count == 0) {
 828                 return 0;
 829         }
 830         if (count == 1) {
 831 #ifdef NEW_LOGGING
 832                 LDAP_LOG( BACK_META, DETAIL1,
 833                                 "DELETING ENTRY TEMPLATE=%s\n",
 834                                 attr->a_vals[0].bv_val, 0, 0 );
 835 #else
 836                 Debug( LDAP_DEBUG_ANY, "DELETING ENTRY TEMPLATE=%s\n",
 837                                 attr->a_vals[0].bv_val, 0, 0 );
 838 #endif
 839
 840                 op_tmp.o_req_dn = rs->sr_entry->e_name;
 841                 op_tmp.o_req_ndn = rs->sr_entry->e_nname;
 842
 843                 if (op->o_bd->be_delete(&op_tmp, rs) == LDAP_SUCCESS) {
 844                         info->deleted++;
 845                 }
 846                 return 0;
 847         }
 848
 849         vals[0] = *info->uuid;
 850         vals[1].bv_val = NULL;
 851         vals[1].bv_len = 0;
 852         mod.sml_op = LDAP_MOD_DELETE;
 853         mod.sml_desc = ad_queryid;
 854         mod.sml_type = ad_queryid->ad_cname;
 855         mod.sml_bvalues = vals;
 856         mod.sml_next = NULL;
 857 #ifdef NEW_LOGGING
 858         LDAP_LOG( BACK_META, DETAIL1,
 859                         "REMOVING TEMP ATTR : TEMPLATE=%s\n",
 860                         attr->a_vals[0].bv_val, 0, 0 );
 861 #else
 862         Debug( LDAP_DEBUG_ANY, "REMOVING TEMP ATTR : TEMPLATE=%s\n",
 863                         attr->a_vals[0].bv_val, 0, 0 );
 864 #endif
 865
 866         op_tmp.o_req_dn = rs->sr_entry->e_name;
 867         op_tmp.o_req_ndn = rs->sr_entry->e_nname;
 868         op_tmp.orm_modlist = &mod;
 869
 870         op->o_bd->be_modify( &op_tmp, &sreply );
 871
 872         return 0;
 873 }
 874
 875 static int
 876 remove_query_data (
 877         Operation       *op,
 878         SlapReply       *rs,
 879         struct berval* query_uuid)
 880 {
 881         struct query_info       info;
 882         char                    filter_str[64];
 883         Filter                  filter = {LDAP_FILTER_EQUALITY};
 884         SlapReply               sreply = {REP_RESULT};
 885         slap_callback cb = { remove_func, NULL };
 886
 887         sreply.sr_entry = NULL;
 888         sreply.sr_nentries = 0;
 889         op->ors_filterstr.bv_len = snprintf(filter_str, sizeof(filter_str),
 890                 "(%s=%s)", ad_queryid->ad_cname.bv_val, query_uuid->bv_val);
 891         filter.f_av_desc = ad_queryid;
 892         filter.f_av_value = *query_uuid;
 893         info.uuid = query_uuid;
 894         info.deleted = 0;
 895         cb.sc_private = &info;
 896
 897         op->o_tag = LDAP_REQ_SEARCH;
 898         op->o_protocol = LDAP_VERSION3;
 899         op->o_callback = &cb;
 900         op->o_time = slap_get_time();
 901         op->o_do_not_cache = 1;
 902
 903         op->o_req_dn = op->o_bd->be_suffix[0];
 904         op->o_req_ndn = op->o_bd->be_nsuffix[0];
 905         op->ors_scope = LDAP_SCOPE_SUBTREE;
 906         op->ors_deref = LDAP_DEREF_NEVER;
 907         op->ors_slimit = 0;
 908         op->ors_tlimit = 0;
 909         op->ors_filter = &filter;
 910         op->ors_filterstr.bv_val = filter_str;
 911         op->ors_filterstr.bv_len = strlen(filter_str);
 912         op->ors_attrs = NULL;
 913         op->ors_attrsonly = 0;
 914
 915         op->o_bd->be_search( op, &sreply );
 916
 917         return info.deleted;
 918 }
 919
 920 static int
 921 get_attr_set(
 922         AttributeName* attrs,
 923         query_manager* qm,
 924         int num
 925 );
 926
 927 static int
 928 attrscmp(
 929         AttributeName* attrs_in,
 930         AttributeName* attrs
 931 );
 932
 933 static int
 934 is_temp_answerable(
 935         int attr_set,
 936         struct berval* tempstr,
 937         query_manager* qm,
 938         int template_id )
 939 {
 940         QueryTemplate *qt = qm->templates + template_id;
 941
 942         if (attr_set != qt->attr_set_index) {
 943                 int* id_array = qm->attr_sets[attr_set].ID_array;
 944
 945                 while (*id_array != -1) {
 946                         if (*id_array == qt->attr_set_index)
 947                                 break;
 948                         id_array++;
 949                 }
 950                 if (*id_array == -1)
 951                         return 0;
 952         }
 953         return (qt->querystr.bv_len == tempstr->bv_len &&
 954                 strcasecmp(qt->querystr.bv_val, tempstr->bv_val) == 0);
 955 }
 956
 957 static void*
 958 consistency_check(
 959         void    *op
 960 );
 961
 962 static int
 963 filter2template(
 964         Filter                  *f,
 965         struct                  berval *fstr,
 966         AttributeName**         filter_attrs,
 967         int*                    filter_cnt )
 968 {
 969         AttributeDescription *ad;
 970
 971         switch ( f->f_choice ) {
 972         case LDAP_FILTER_EQUALITY:
 973                 ad = f->f_av_desc;
 974                 sprintf( fstr->bv_val+fstr->bv_len, "(%s=)", ad->ad_cname.bv_val );
 975                 fstr->bv_len += ad->ad_cname.bv_len + ( sizeof("(=)") - 1 );
 976                 break;
 977
 978         case LDAP_FILTER_GE:
 979                 ad = f->f_av_desc;
 980                 sprintf( fstr->bv_val+fstr->bv_len, "(%s>=)", ad->ad_cname.bv_val);
 981                 fstr->bv_len += ad->ad_cname.bv_len + ( sizeof("(>=)") - 1 );
 982                 break;
 983
 984         case LDAP_FILTER_LE:
 985                 ad = f->f_av_desc;
 986                 sprintf( fstr->bv_val+fstr->bv_len, "(%s<=)", ad->ad_cname.bv_val);
 987                 fstr->bv_len += ad->ad_cname.bv_len + ( sizeof("(<=)") - 1 );
 988                 break;
 989
 990         case LDAP_FILTER_APPROX:
 991                 ad = f->f_av_desc;
 992                 sprintf( fstr->bv_val+fstr->bv_len, "(%s~=)", ad->ad_cname.bv_val);
 993                 fstr->bv_len += ad->ad_cname.bv_len + ( sizeof("(~=)") - 1 );
 994                 break;
 995
 996         case LDAP_FILTER_SUBSTRINGS:
 997                 ad = f->f_sub_desc;
 998                 sprintf( fstr->bv_val+fstr->bv_len, "(%s=)", ad->ad_cname.bv_val );
 999                 fstr->bv_len += ad->ad_cname.bv_len + ( sizeof("(=)") - 1 );
1000                 break;
1001
1002         case LDAP_FILTER_PRESENT:
1003                 ad = f->f_desc;
1004                 sprintf( fstr->bv_val+fstr->bv_len, "(%s=*)", ad->ad_cname.bv_val );
1005                 fstr->bv_len += ad->ad_cname.bv_len + ( sizeof("(=*)") - 1 );
1006                 break;
1007
1008         case LDAP_FILTER_AND:
1009         case LDAP_FILTER_OR:
1010         case LDAP_FILTER_NOT: {
1011                 int rc = 0;
1012                 sprintf( fstr->bv_val+fstr->bv_len, "(%c",
1013                         f->f_choice == LDAP_FILTER_AND ? '&' :
1014                         f->f_choice == LDAP_FILTER_OR ? '|' : '!' );
1015                 fstr->bv_len += sizeof("(%") - 1;
1016
1017                 for ( f = f->f_list; f != NULL; f = f->f_next ) {
1018                         rc = filter2template( f, fstr, filter_attrs, filter_cnt );
1019                         if ( rc ) break;
1020                 }
1021                 sprintf( fstr->bv_val+fstr->bv_len, ")" );
1022                 fstr->bv_len += sizeof(")") - 1;
1023
1024                 return rc;
1025                 }
1026
1027         default:
1028                 strcpy( fstr->bv_val, "(?=?)" );
1029                 fstr->bv_len += sizeof("(?=?)")-1;
1030                 return -1;
1031         }
1032
1033         *filter_attrs = (AttributeName *)ch_realloc(*filter_attrs,
1034                                 (*filter_cnt + 2)*sizeof(AttributeName));
1035
1036         (*filter_attrs)[*filter_cnt].an_desc = ad;
1037         (*filter_attrs)[*filter_cnt].an_name = ad->ad_cname;
1038         (*filter_attrs)[*filter_cnt+1].an_name.bv_val = NULL;
1039         (*filter_attrs)[*filter_cnt+1].an_name.bv_len = 0;
1040         (*filter_cnt)++;
1041         return 0;
1042 }
1043
1044 struct search_info {
1045         slap_overinst *on;
1046         slap_callback *prev;
1047         Query query;
1048         int template_id;
1049         int max;
1050         int over;
1051         int count;
1052         Entry *head, *tail;
1053 };
1054
1055 static int
1056 cache_entries(
1057         Operation       *op,
1058         SlapReply       *rs,
1059         struct berval *query_uuid)
1060 {
1061         struct search_info *si = op->o_callback->sc_private;
1062         slap_overinst *on = si->on;
1063         cache_manager *cm = on->on_bi.bi_private;
1064         query_manager*          qm = cm->qm;
1065         int             i;
1066         int             return_val;
1067         Entry           *e;
1068         struct berval   crp_uuid;
1069         char            uuidbuf[ LDAP_LUTIL_UUIDSTR_BUFSIZE ];
1070         Operation op_tmp = *op;
1071         BackendDB db = *op->o_bd;
1072
1073         query_uuid->bv_len = lutil_uuidstr(uuidbuf, sizeof(uuidbuf));
1074         ber_str2bv(uuidbuf, query_uuid->bv_len, 1, query_uuid);
1075
1076         op_tmp.o_bd = &db;
1077         op_tmp.o_dn = db.be_rootdn;
1078         op_tmp.o_ndn = db.be_rootndn;
1079         db.bd_info = cm->bi;
1080         db.be_private =cm->be_private;
1081         db.be_flags |= SLAP_BFLAG_NO_SCHEMA_CHECK;
1082
1083 #ifdef NEW_LOGGING
1084         LDAP_LOG( BACK_META, DETAIL1, "UUID for query being added = %s\n",
1085                         uuidbuf, 0, 0 );
1086 #else /* !NEW_LOGGING */
1087         Debug( LDAP_DEBUG_ANY, "UUID for query being added = %s\n",
1088                         uuidbuf, 0, 0 );
1089 #endif /* !NEW_LOGGING */
1090
1091         for ( e=si->head; e; e=si->head ) {
1092                 si->head = e->e_private;
1093                 e->e_private = NULL;
1094 #ifdef NEW_LOGGING
1095                 LDAP_LOG( BACK_META, DETAIL2, "LOCKING REMOVE MUTEX\n",
1096                                 0, 0, 0 );
1097 #else /* !NEW_LOGGING */
1098                 Debug( LDAP_DEBUG_NONE, "LOCKING REMOVE MUTEX\n", 0, 0, 0 );
1099 #endif /* !NEW_LOGGING */
1100                 ldap_pvt_thread_mutex_lock(&cm->remove_mutex);
1101 #ifdef NEW_LOGGING
1102                 LDAP_LOG( BACK_META, DETAIL2, "LOCKED REMOVE MUTEX\n", 0, 0, 0);
1103 #else /* !NEW_LOGGING */
1104                 Debug( LDAP_DEBUG_NONE, "LOCKED REMOVE MUTEX\n", 0, 0, 0);
1105 #endif /* !NEW_LOGGING */
1106                 while ( cm->cur_entries > (cm->max_entries) ) {
1107                                 qm->crfunc(qm, &crp_uuid);
1108                                 if (crp_uuid.bv_val) {
1109 #ifdef NEW_LOGGING
1110                                         LDAP_LOG( BACK_META, DETAIL1,
1111                                                 "Removing query UUID %s\n",
1112                                                 crp_uuid.bv_val, 0, 0 );
1113 #else /* !NEW_LOGGING */
1114                                         Debug( LDAP_DEBUG_ANY,
1115                                                 "Removing query UUID %s\n",
1116                                                 crp_uuid.bv_val, 0, 0 );
1117 #endif /* !NEW_LOGGING */
1118                                         return_val = remove_query_data(&op_tmp, rs, &crp_uuid);
1119 #ifdef NEW_LOGGING
1120                                         LDAP_LOG( BACK_META, DETAIL1,
1121                                                 "QUERY REMOVED, SIZE=%d\n",
1122                                                 return_val, 0, 0);
1123 #else /* !NEW_LOGGING */
1124                                         Debug( LDAP_DEBUG_ANY,
1125                                                 "QUERY REMOVED, SIZE=%d\n",
1126                                                 return_val, 0, 0);
1127 #endif /* !NEW_LOGGING */
1128                                         ldap_pvt_thread_mutex_lock(
1129                                                         &cm->cache_mutex );
1130                                         cm->cur_entries -= return_val;
1131                                         cm->num_cached_queries--;
1132 #ifdef NEW_LOGGING
1133                                         LDAP_LOG( BACK_META, DETAIL1,
1134                                                 "STORED QUERIES = %lu\n",
1135                                                 cm->num_cached_queries, 0, 0 );
1136 #else /* !NEW_LOGGING */
1137                                         Debug( LDAP_DEBUG_ANY,
1138                                                 "STORED QUERIES = %lu\n",
1139                                                 cm->num_cached_queries, 0, 0 );
1140 #endif /* !NEW_LOGGING */
1141                                         ldap_pvt_thread_mutex_unlock(
1142                                                         &cm->cache_mutex );
1143 #ifdef NEW_LOGGING
1144                                         LDAP_LOG( BACK_META, DETAIL1,
1145                                                 "QUERY REMOVED, CACHE ="
1146                                                 "%d entries\n",
1147                                                 cm->cur_entries, 0, 0 );
1148 #else /* !NEW_LOGGING */
1149                                         Debug( LDAP_DEBUG_ANY,
1150                                                 "QUERY REMOVED, CACHE ="
1151                                                 "%d entries\n",
1152                                                 cm->cur_entries, 0, 0 );
1153 #endif /* !NEW_LOGGING */
1154                                 }
1155                 }
1156
1157                 return_val = merge_entry(&op_tmp, e, query_uuid);
1158 #ifdef NEW_LOGGING
1159                 LDAP_LOG( BACK_META, DETAIL1,
1160                         "ENTRY ADDED/MERGED, CACHE =%d entries\n",
1161                         cm->cur_entries, 0, 0 );
1162 #else /* !NEW_LOGGING */
1163                 Debug( LDAP_DEBUG_ANY,
1164                         "ENTRY ADDED/MERGED, CACHE =%d entries\n",
1165                         cm->cur_entries, 0, 0 );
1166 #endif /* !NEW_LOGGING */
1167 #ifdef NEW_LOGGING
1168                 LDAP_LOG( BACK_META, DETAIL2, "UNLOCKING REMOVE MUTEX\n",
1169                                 0, 0, 0 );
1170 #else /* !NEW_LOGGING */
1171                 Debug( LDAP_DEBUG_NONE, "UNLOCKING REMOVE MUTEX\n", 0, 0, 0 );
1172 #endif /* !NEW_LOGGING */
1173                 ldap_pvt_thread_mutex_unlock(&cm->remove_mutex);
1174 #ifdef NEW_LOGGING
1175                 LDAP_LOG( BACK_META, DETAIL2, "UNLOCKED REMOVE MUTEX\n",
1176                                 0, 0, 0 );
1177 #else /* !NEW_LOGGING */
1178                 Debug( LDAP_DEBUG_NONE, "UNLOCKED REMOVE MUTEX\n", 0, 0, 0 );
1179 #endif /* !NEW_LOGGING */
1180                 if (return_val)
1181                         return 0;
1182                 ldap_pvt_thread_mutex_lock(&cm->cache_mutex);
1183                 cm->cur_entries++;
1184 #ifdef NEW_LOGGING
1185                 LDAP_LOG( BACK_META, DETAIL1,
1186                         "ENTRY ADDED/MERGED, SIZE=%d, CACHED ENTRIES=%d\n",
1187                         return_val, cm->cur_entries, 0 );
1188 #else /* !NEW_LOGGING */
1189                 Debug( LDAP_DEBUG_ANY,
1190                         "ENTRY ADDED/MERGED, SIZE=%d, CACHED ENTRIES=%d\n",
1191                         return_val, cm->cur_entries, 0 );
1192 #endif /* !NEW_LOGGING */
1193                 ldap_pvt_thread_mutex_unlock(&cm->cache_mutex);
1194         }
1195         ldap_pvt_thread_mutex_lock(&cm->cache_mutex);
1196         cm->num_cached_queries++;
1197 #ifdef NEW_LOGGING
1198         LDAP_LOG( BACK_META, DETAIL1, "STORED QUERIES = %lu\n",
1199                         cm->num_cached_queries, 0, 0 );
1200 #else /* !NEW_LOGGING */
1201         Debug( LDAP_DEBUG_ANY, "STORED QUERIES = %lu\n",
1202                         cm->num_cached_queries, 0, 0 );
1203 #endif /* !NEW_LOGGING */
1204         ldap_pvt_thread_mutex_unlock(&cm->cache_mutex);
1205
1206         return return_val;
1207 }
1208
1209 static int
1210 proxy_cache_response(
1211         Operation       *op,
1212         SlapReply       *rs )
1213 {
1214         struct search_info *si = op->o_callback->sc_private;
1215         slap_overinst *on = si->on;
1216         cache_manager *cm = on->on_bi.bi_private;
1217         query_manager*          qm = cm->qm;
1218         struct berval uuid;
1219
1220         if ( rs->sr_type == REP_SEARCH ) {
1221                 Entry *e;
1222                 /* If we haven't exceeded the limit for this query,
1223                  * build a chain of answers to store. If we hit the
1224                  * limit, empty the chain and ignore the rest.
1225                  */
1226                 if ( !si->over ) {
1227                         if ( si->count < si->max ) {
1228                                 si->count++;
1229                                 e = entry_dup( rs->sr_entry );
1230                                 if ( !si->head ) si->head = e;
1231                                 if ( si->tail ) si->tail->e_private = e;
1232                                 si->tail = e;
1233                         } else {
1234                                 si->over = 1;
1235                                 si->count = 0;
1236                                 for (;si->head; si->head=e) {
1237                                         e = si->head->e_private;
1238                                         si->head->e_private = NULL;
1239                                         entry_free(si->head);
1240                                 }
1241                                 si->tail = NULL;
1242                         }
1243                 }
1244         } else if ( rs->sr_type == REP_RESULT && !si->over ) {
1245                 if ( cache_entries( op, rs, &uuid ) == 0)
1246                         qm->addfunc(qm, &si->query, si->template_id, &uuid);
1247         }
1248         return SLAP_CB_CONTINUE;
1249 }
1250
1251 static void
1252 add_filter_attrs(
1253         Operation *op,
1254         AttributeName** new_attrs,
1255         AttributeName* attrs,
1256         AttributeName* filter_attrs )
1257 {
1258         int alluser = 0;
1259         int allop = 0;
1260         int i;
1261         int count;
1262
1263         /* duplicate attrs */
1264         if (attrs == NULL) {
1265                 count = 1;
1266         } else {
1267                 for (count=0; attrs[count].an_name.bv_val; count++)
1268                         ;
1269         }
1270         *new_attrs = (AttributeName*)(op->o_tmpalloc((count+1)*
1271                 sizeof(AttributeName), op->o_tmpmemctx));
1272         if (attrs == NULL) {
1273                 (*new_attrs)[0].an_name.bv_val = "*";
1274                 (*new_attrs)[0].an_name.bv_len = 1;
1275                 (*new_attrs)[1].an_name.bv_val = NULL;
1276                 (*new_attrs)[1].an_name.bv_len = 0;
1277                 alluser = 1;
1278                 allop = 0;
1279         } else {
1280                 for (i=0; i<count; i++) {
1281                         (*new_attrs)[i].an_name = attrs[i].an_name;
1282                         (*new_attrs)[i].an_desc = attrs[i].an_desc;
1283                 }
1284                 (*new_attrs)[count].an_name.bv_val = NULL;
1285                 (*new_attrs)[count].an_name.bv_len = 0;
1286                 alluser = an_find(*new_attrs, &AllUser);
1287                 allop = an_find(*new_attrs, &AllOper);
1288         }
1289
1290         for ( i=0; filter_attrs[i].an_name.bv_val; i++ ) {
1291                 if ( an_find(*new_attrs, &filter_attrs[i].an_name ))
1292                         continue;
1293                 if ( is_at_operational(filter_attrs[i].an_desc->ad_type) ) {
1294                         if (allop)
1295                                 continue;
1296                 } else if (alluser)
1297                         continue;
1298                 *new_attrs = (AttributeName*)(op->o_tmprealloc(*new_attrs,
1299                                         (count+2)*sizeof(AttributeName), op->o_tmpmemctx));
1300                 (*new_attrs)[count].an_name = filter_attrs[i].an_name;
1301                 (*new_attrs)[count].an_desc = filter_attrs[i].an_desc;
1302                 count++;
1303                 (*new_attrs)[count].an_name.bv_val = NULL;
1304                 (*new_attrs)[count].an_name.bv_len = 0;
1305         }
1306 }
1307
1308 static int
1309 proxy_cache_search(
1310         Operation       *op,
1311         SlapReply       *rs )
1312 {
1313         slap_overinst *on = (slap_overinst *)op->o_bd->bd_info;
1314         cache_manager *cm = on->on_bi.bi_private;
1315         query_manager*          qm = cm->qm;
1316
1317         int count;
1318
1319         int i = -1;
1320
1321         AttributeName   *filter_attrs = NULL;
1322         AttributeName   *new_attrs = NULL;
1323
1324         Query           query;
1325
1326         int             attr_set = -1;
1327         int             template_id = -1;
1328         int             answerable = 0;
1329         int             cacheable = 0;
1330         int             fattr_cnt=0;
1331         int             oc_attr_absent = 1;
1332
1333         struct berval tempstr;
1334
1335         tempstr.bv_val = op->o_tmpalloc( op->ors_filterstr.bv_len+1, op->o_tmpmemctx );
1336         tempstr.bv_len = 0;
1337         if (filter2template(op->ors_filter, &tempstr, &filter_attrs, &fattr_cnt)) {
1338                 op->o_tmpfree( tempstr.bv_val, op->o_tmpmemctx );
1339                 return SLAP_CB_CONTINUE;
1340         }
1341
1342 #ifdef NEW_LOGGING
1343         LDAP_LOG( BACK_META, DETAIL1, "query template of incoming query = %s\n",
1344                                         tempstr.bv_val, 0, 0 );
1345 #else /* !NEW_LOGGING */
1346         Debug( LDAP_DEBUG_ANY, "query template of incoming query = %s\n",
1347                                         tempstr.bv_val, 0, 0 );
1348 #endif /* !NEW_LOGGING */
1349
1350         /* find attr set */
1351         attr_set = get_attr_set(op->ors_attrs, qm, cm->numattrsets);
1352
1353         query.filter = op->ors_filter;
1354         query.attrs = op->ors_attrs;
1355         query.base = op->o_req_ndn;
1356         query.scope = op->ors_scope;
1357
1358         /* check for query containment */
1359         if (attr_set > -1) {
1360                 for (i=0; i<cm->numtemplates; i++) {
1361                         /* find if template i can potentially answer tempstr */
1362                         if (!is_temp_answerable(attr_set, &tempstr, qm, i))
1363                                 continue;
1364                         if (attr_set == qm->templates[i].attr_set_index) {
1365                                 cacheable = 1;
1366                                 template_id = i;
1367                         }
1368 #ifdef NEW_LOGGING
1369                         LDAP_LOG( BACK_META, DETAIL2,
1370                                         "Entering QC, querystr = %s\n",
1371                                         op->ors_filterstr.bv_val, 0, 0 );
1372 #else /* !NEW_LOGGING */
1373                         Debug( LDAP_DEBUG_NONE, "Entering QC, querystr = %s\n",
1374                                         op->ors_filterstr.bv_val, 0, 0 );
1375 #endif /* !NEW_LOGGING */
1376                         answerable = (*(qm->qcfunc))(qm, &query, i);
1377
1378                         if (answerable)
1379                                 break;
1380                 }
1381         }
1382         op->o_tmpfree( tempstr.bv_val, op->o_tmpmemctx );
1383
1384         if (answerable) {
1385                 BackendDB db, *be;
1386 #ifdef NEW_LOGGING
1387                 LDAP_LOG( BACK_META, DETAIL1, "QUERY ANSWERABLE\n", 0, 0, 0 );
1388 #else /* !NEW_LOGGING */
1389                 Debug( LDAP_DEBUG_ANY, "QUERY ANSWERABLE\n", 0, 0, 0 );
1390 #endif /* !NEW_LOGGING */
1391                 free(filter_attrs);
1392                 ldap_pvt_thread_rdwr_runlock(&qm->templates[i].t_rwlock);
1393                 db = *op->o_bd;
1394                 db.bd_info = cm->bi;
1395                 db.be_private = cm->be_private;
1396                 be = op->o_bd;
1397                 op->o_bd = &db;
1398                 i = cm->bi->bi_op_search( op, rs );
1399                 op->o_bd = be;
1400                 return i;
1401         }
1402
1403 #ifdef NEW_LOGGING
1404         LDAP_LOG( BACK_META, DETAIL1, "QUERY NOT ANSWERABLE\n",
1405                                 0, 0, 0 );
1406 #else /* !NEW_LOGGING */
1407         Debug( LDAP_DEBUG_ANY, "QUERY NOT ANSWERABLE\n", 0, 0, 0 );
1408 #endif /* !NEW_LOGGING */
1409
1410         ldap_pvt_thread_mutex_lock(&cm->cache_mutex);
1411         if (cm->num_cached_queries >= cm->max_queries) {
1412                 cacheable = 0;
1413         }
1414         ldap_pvt_thread_mutex_unlock(&cm->cache_mutex);
1415
1416         if (cacheable) {
1417                 slap_callback *cb;
1418                 struct search_info *si;
1419 #ifdef NEW_LOGGING
1420                 LDAP_LOG( BACK_META, DETAIL1,
1421                         "QUERY CACHEABLE\n", 0, 0, 0 );
1422 #else /* !NEW_LOGGING */
1423                 Debug( LDAP_DEBUG_ANY, "QUERY CACHEABLE\n", 0, 0, 0 );
1424 #endif /* !NEW_LOGGING */
1425                 query.filter = str2filter(op->ors_filterstr.bv_val);
1426                 if (op->ors_attrs) {
1427                         for ( count=0; op->ors_attrs[ count ].an_name.bv_val; count++ ) {
1428                                 if ( op->ors_attrs[count].an_desc == slap_schema.si_ad_objectClass )
1429                                         oc_attr_absent = 0;
1430                         }
1431                         query.attrs = (AttributeName*)ch_malloc( ( count + 1 + oc_attr_absent )
1432                                                                         *sizeof(AttributeName));
1433                         for ( count=0; op->ors_attrs[ count ].an_name.bv_val; count++ ) {
1434                                 ber_dupbv( &query.attrs[count].an_name, &op->ors_attrs[count].an_name );
1435                                 query.attrs[count].an_desc = op->ors_attrs[count].an_desc;
1436                         }
1437                         if ( oc_attr_absent ) {
1438                                 query.attrs[ count ].an_desc = slap_schema.si_ad_objectClass;
1439                                 query.attrs[ count ].an_name = query.attrs[count].an_desc->ad_cname;
1440                                 count++;
1441                         }
1442                         query.attrs[ count ].an_name.bv_val = NULL;
1443                         query.attrs[ count ].an_name.bv_len = 0;
1444                 }
1445                 op->o_tmpfree(op->ors_attrs, op->o_tmpmemctx);
1446                 add_filter_attrs(op, &op->ors_attrs, query.attrs, filter_attrs);
1447                 cb = op->o_tmpalloc( sizeof(*cb) + sizeof(*si), op->o_tmpmemctx);
1448                 cb->sc_response = proxy_cache_response;
1449                 cb->sc_private = (cb+1);
1450                 si = cb->sc_private;
1451                 si->on = on;
1452                 si->prev = op->o_callback;
1453                 si->query = query;
1454                 si->template_id = template_id;
1455                 si->max = cm->num_entries_limit ;
1456                 si->over = 0;
1457                 si->count = 0;
1458                 si->head = NULL;
1459                 si->tail = NULL;
1460                 op->o_callback = cb;
1461         } else {
1462 #ifdef NEW_LOGGING
1463                 LDAP_LOG( BACK_META, DETAIL1,
1464                                         "QUERY NOT CACHEABLE no\n",
1465                                         0, 0, 0);
1466 #else /* !NEW_LOGGING */
1467                 Debug( LDAP_DEBUG_ANY, "QUERY NOT CACHEABLE no\n",
1468                                         0, 0, 0);
1469 #endif /* !NEW_LOGGING */
1470         }
1471
1472         free(filter_attrs);
1473
1474         return SLAP_CB_CONTINUE;
1475 }
1476
1477 static int
1478 attrscmp(
1479         AttributeName* attrs_in,
1480         AttributeName* attrs)
1481 {
1482         int i, count1, count2;
1483         if ( attrs_in == NULL ) {
1484                 return (attrs ? 0 : 1);
1485         }
1486         if ( attrs == NULL )
1487                 return 0;
1488
1489         for ( count1=0;
1490               attrs_in && attrs_in[count1].an_name.bv_val != NULL;
1491               count1++ )
1492                 ;
1493         for ( count2=0;
1494               attrs && attrs[count2].an_name.bv_val != NULL;
1495               count2++)
1496                 ;
1497         if ( count1 != count2 )
1498                 return 0;
1499
1500         for ( i=0; i<count1; i++ ) {
1501                 if ( !an_find(attrs, &attrs_in[i].an_name ))
1502                         return 0;
1503         }
1504         return 1;
1505 }
1506
1507 static int
1508 get_attr_set(
1509         AttributeName* attrs,
1510         query_manager* qm,
1511         int num )
1512 {
1513         int i;
1514         for (i=0; i<num; i++) {
1515                 if (attrscmp(attrs, qm->attr_sets[i].attrs))
1516                         return i;
1517         }
1518         return -1;
1519 }
1520
1521 static void*
1522 consistency_check(void* operation)
1523 {
1524         Operation op = *(Operation*)operation;
1525         BackendDB be = *op.o_bd;
1526
1527         SlapReply rs = {REP_RESULT};
1528
1529         slap_overinst *on = (slap_overinst *)op.o_bd->bd_info;
1530         cache_manager*  cm = on->on_bi.bi_private;
1531         query_manager* qm = cm->qm;
1532         CachedQuery* query, *query_prev;
1533         time_t curr_time;
1534         struct berval uuid;
1535         int i, return_val;
1536         QueryTemplate* templ;
1537
1538         op.o_bd = &be;
1539         be.bd_info = cm->bi;
1540         be.be_private = cm->be_private;
1541
1542         for(;;) {
1543                 ldap_pvt_thread_sleep(cm->cc_period);
1544                 for (i=0; qm->templates[i].querystr.bv_val; i++) {
1545                         templ = qm->templates + i;
1546                         query = templ->query_last;
1547                         curr_time = slap_get_time();
1548                         ldap_pvt_thread_mutex_lock(&cm->remove_mutex);
1549                         while (query && (query->expiry_time < curr_time)) {
1550                                 ldap_pvt_thread_mutex_lock(&qm->lru_mutex);
1551                                 remove_query(qm, query);
1552                                 ldap_pvt_thread_mutex_unlock(&qm->lru_mutex);
1553 #ifdef NEW_LOGGING
1554                                 LDAP_LOG( BACK_META, DETAIL1, "Lock CR index = %d\n",
1555                                                 i, 0, 0 );
1556 #else /* !NEW_LOGGING */
1557                                 Debug( LDAP_DEBUG_ANY, "Lock CR index = %d\n",
1558                                                 i, 0, 0 );
1559 #endif /* !NEW_LOGGING */
1560                                 ldap_pvt_thread_rdwr_wlock(&templ->t_rwlock);
1561                                 remove_from_template(query, templ);
1562 #ifdef NEW_LOGGING
1563                                 LDAP_LOG( BACK_META, DETAIL1,
1564                                                 "TEMPLATE %d QUERIES-- %d\n",
1565                                                 i, templ->no_of_queries, 0 );
1566 #else /* !NEW_LOGGING */
1567                                 Debug( LDAP_DEBUG_ANY, "TEMPLATE %d QUERIES-- %d\n",
1568                                                 i, templ->no_of_queries, 0 );
1569 #endif /* !NEW_LOGGING */
1570 #ifdef NEW_LOGGING
1571                                 LDAP_LOG( BACK_META, DETAIL1, "Unlock CR index = %d\n",
1572                                                 i, 0, 0 );
1573 #else /* !NEW_LOGGING */
1574                                 Debug( LDAP_DEBUG_ANY, "Unlock CR index = %d\n",
1575                                                 i, 0, 0 );
1576 #endif /* !NEW_LOGGING */
1577                                 ldap_pvt_thread_rdwr_wunlock(&templ->t_rwlock);
1578                                 uuid = query->q_uuid;
1579                                 return_val = remove_query_data(&op, &rs, &uuid);
1580 #ifdef NEW_LOGGING
1581                                 LDAP_LOG( BACK_META, DETAIL1,
1582                                                 "STALE QUERY REMOVED, SIZE=%d\n",
1583                                                 return_val, 0, 0 );
1584 #else /* !NEW_LOGGING */
1585                                 Debug( LDAP_DEBUG_ANY, "STALE QUERY REMOVED, SIZE=%d\n",
1586                                                         return_val, 0, 0 );
1587 #endif /* !NEW_LOGGING */
1588                                 ldap_pvt_thread_mutex_lock(&cm->cache_mutex);
1589                                 cm->cur_entries -= return_val;
1590                                 cm->num_cached_queries--;
1591 #ifdef NEW_LOGGING
1592                                 LDAP_LOG( BACK_META, DETAIL1, "STORED QUERIES = %lu\n",
1593                                                 cm->num_cached_queries, 0, 0 );
1594 #else /* !NEW_LOGGING */
1595                                 Debug( LDAP_DEBUG_ANY, "STORED QUERIES = %lu\n",
1596                                                 cm->num_cached_queries, 0, 0 );
1597 #endif /* !NEW_LOGGING */
1598                                 ldap_pvt_thread_mutex_unlock(&cm->cache_mutex);
1599 #ifdef NEW_LOGGING
1600                                 LDAP_LOG( BACK_META, DETAIL1,
1601                                         "STALE QUERY REMOVED, CACHE ="
1602                                         "%d entries\n",
1603                                         cm->cur_entries, 0, 0 );
1604 #else /* !NEW_LOGGING */
1605                                 Debug( LDAP_DEBUG_ANY,
1606                                         "STALE QUERY REMOVED, CACHE ="
1607                                         "%d entries\n",
1608                                         cm->cur_entries, 0, 0 );
1609 #endif /* !NEW_LOGGING */
1610                                 query_prev = query;
1611                                 query = query->prev;
1612                                 free_query(query_prev);
1613                         }
1614                         ldap_pvt_thread_mutex_unlock(&cm->remove_mutex);
1615                 }
1616         }
1617 }
1618
1619
1620 #define MAX_ATTR_SETS 500
1621 static void find_supersets( struct attr_set* attr_sets, int numsets );
1622 static int compare_sets( struct attr_set* setA, int, int );
1623
1624 static int
1625 proxy_cache_config(
1626         BackendDB       *be,
1627         const char      *fname,
1628         int             lineno,
1629         int             argc,
1630         char            **argv
1631 )
1632 {
1633         slap_overinst *on = (slap_overinst *)be->bd_info;
1634         cache_manager*  cm = on->on_bi.bi_private;
1635         query_manager*  qm = cm->qm;
1636         QueryTemplate*  temp;
1637         AttributeName*  attr_name;
1638         AttributeName*  attrarray;
1639         const char*     text=NULL;
1640         void *private = be->be_private;
1641
1642         int             index, i;
1643         int             num;
1644
1645         if ( strcasecmp( argv[0], "proxycache" ) == 0 ) {
1646                 if ( argc < 6 ) {
1647                         fprintf( stderr, "%s: line %d: missing arguments in \"proxycache"
1648                                 " <backend> <max_entries> <numattrsets> <entry limit> "
1649                                 "<cycle_time>\"\n", fname, lineno );
1650                         return( 1 );
1651                 }
1652
1653                 cm->bi = backend_info( argv[1] );
1654                 if ( !cm->bi ) {
1655                         fprintf( stderr, "%s: line %d: backend %s unknown\n",
1656                                 fname, lineno, argv[1] );
1657                         return( 1 );
1658                 }
1659                 be->be_private = NULL;
1660                 i = cm->bi->bi_db_init( be );
1661                 cm->be_private = be->be_private;
1662                 be->be_private = private;
1663                 if ( i ) return( 1 );
1664
1665                 cm->max_entries = atoi( argv[2] );
1666
1667                 cm->numattrsets = atoi( argv[3] );
1668                 if ( cm->numattrsets > MAX_ATTR_SETS ) {
1669                         fprintf( stderr, "%s: line %d: numattrsets must be <= %d\n",
1670                                 fname, lineno, MAX_ATTR_SETS );
1671                         return( 1 );
1672                 }
1673
1674                 cm->num_entries_limit = atoi( argv[4] );
1675                 cm->cc_period = atoi( argv[5] );
1676 #ifdef NEW_LOGGING
1677                 LDAP_LOG( BACK_META, DETAIL1,
1678                                 "Total # of attribute sets to be cached = %d\n",
1679                                 cm->numattrsets, 0, 0 );
1680 #else
1681                 Debug( LDAP_DEBUG_ANY,
1682                                 "Total # of attribute sets to be cached = %d\n",
1683                                 cm->numattrsets, 0, 0 );
1684 #endif
1685                 qm->attr_sets = ( struct attr_set * )ch_malloc( cm->numattrsets *
1686                                                 sizeof( struct attr_set ));
1687                 for ( i = 0; i < cm->numattrsets; i++ ) {
1688                         qm->attr_sets[i].attrs = NULL;
1689                 }
1690
1691         } else if ( strcasecmp( argv[0], "proxyattrset" ) == 0 ) {
1692                 if ( argc < 3 ) {
1693                         fprintf( stderr, "%s: line %d: missing arguments in \"proxyattrset "
1694                                 "<index> <attributes>\"\n", fname, lineno );
1695                         return( 1 );
1696                 }
1697 #ifdef NEW_LOGGING
1698                 LDAP_LOG( BACK_META, DETAIL1, "Attribute Set # %d\n",
1699                                 atoi( argv[1] ), 0, 0 );
1700 #else
1701                 Debug( LDAP_DEBUG_ANY, "Attribute Set # %d\n",
1702                                 atoi( argv[1] ), 0, 0 );
1703 #endif
1704                 if (atoi(argv[1]) >= cm->numattrsets) {
1705                         fprintf( stderr, "%s; line %d index out of bounds \n",
1706                                         fname, lineno );
1707                         return 1;
1708                 }
1709                 index = atoi( argv[1] );
1710                 if ( argv[2] && strcmp( argv[2], "*" ) ) {
1711                         qm->attr_sets[index].count = argc - 2;
1712                         qm->attr_sets[index].attrs = (AttributeName*)ch_malloc(
1713                                                 (argc-1) * sizeof( AttributeName ));
1714                         attr_name = qm->attr_sets[index].attrs;
1715                         for ( i = 2; i < argc; i++ ) {
1716 #ifdef NEW_LOGGING
1717                                 LDAP_LOG( BACK_META, DETAIL1, "\t %s\n",
1718                                                 argv[i], 0, 0 );
1719 #else
1720                                 Debug( LDAP_DEBUG_ANY, "\t %s\n",
1721                                                 argv[i], 0, 0 );
1722 #endif
1723                                 ber_str2bv( argv[i], 0, 1,
1724                                                 &attr_name->an_name);
1725                                 attr_name->an_desc = NULL;
1726                                 slap_bv2ad( &attr_name->an_name,
1727                                                 &attr_name->an_desc, &text );
1728                                 attr_name++;
1729                                 attr_name->an_name.bv_val = NULL;
1730                                 attr_name->an_name.bv_len = 0;
1731                         }
1732                 }
1733         } else if ( strcasecmp( argv[0], "proxytemplate" ) == 0 ) {
1734                 if ( argc != 4 ) {
1735                         fprintf( stderr, "%s: line %d: missing argument(s) in "
1736                                 "\"proxytemplate <filter> <proj attr set> <TTL>\" line\n",
1737                                 fname, lineno );
1738                         return( 1 );
1739                 }
1740                 if (( i = atoi( argv[2] )) >= cm->numattrsets ) {
1741 #ifdef NEW_LOGGING
1742                         LDAP_LOG( BACK_META, DETAIL1,
1743                                         "%s: line %d, template index invalid\n",
1744                                         fname, lineno, 0 );
1745 #else
1746                         Debug( LDAP_DEBUG_ANY,
1747                                         "%s: line %d, template index invalid\n",
1748                                         fname, lineno, 0 );
1749 #endif
1750                         return 1;
1751                 }
1752                 num = cm->numtemplates;
1753                 if ( num == 0 )
1754                         find_supersets( qm->attr_sets, cm->numattrsets );
1755                 qm->templates = ( QueryTemplate* )ch_realloc( qm->templates,
1756                                 ( num + 2 ) * sizeof( QueryTemplate ));
1757                 temp = qm->templates + num;
1758                 ldap_pvt_thread_rdwr_init( &temp->t_rwlock );
1759                 temp->query = temp->query_last = NULL;
1760                 temp->ttl = atoi( argv[3] );
1761                 temp->no_of_queries = 0;
1762                 if ( argv[1] == NULL ) {
1763 #ifdef NEW_LOGGING
1764                         LDAP_LOG( BACK_META, DETAIL1,
1765                                         "Templates string not specified "
1766                                         "for template %d\n", num, 0, 0 );
1767 #else
1768                         Debug( LDAP_DEBUG_ANY,
1769                                         "Templates string not specified "
1770                                         "for template %d\n", num, 0, 0 );
1771 #endif
1772                         return 1;
1773                 }
1774                 ber_str2bv( argv[1], 0, 1, &temp->querystr );
1775 #ifdef NEW_LOGGING
1776                 LDAP_LOG( BACK_META, DETAIL1, "Template:\n", 0, 0, 0 );
1777 #else
1778                 Debug( LDAP_DEBUG_ANY, "Template:\n", 0, 0, 0 );
1779 #endif
1780 #ifdef NEW_LOGGING
1781                 LDAP_LOG( BACK_META, DETAIL1, "  query template: %s\n",
1782                                 temp->querystr.bv_val, 0, 0 );
1783 #else
1784                 Debug( LDAP_DEBUG_ANY, "  query template: %s\n",
1785                                 temp->querystr.bv_val, 0, 0 );
1786 #endif
1787                 temp->attr_set_index = i;
1788 #ifdef NEW_LOGGING
1789                 LDAP_LOG( BACK_META, DETAIL1, "  attributes: \n", 0, 0, 0 );
1790 #else
1791                 Debug( LDAP_DEBUG_ANY, "  attributes: \n", 0, 0, 0 );
1792 #endif
1793                 if ( ( attrarray = qm->attr_sets[i].attrs ) != NULL ) {
1794                         for ( i=0; attrarray[i].an_name.bv_val; i++ )
1795 #ifdef NEW_LOGGING
1796                                 LDAP_LOG( BACK_META, DETAIL1, "\t%s\n",
1797                                         attrarray[i].an_name.bv_val, 0, 0 );
1798 #else
1799                                 Debug( LDAP_DEBUG_ANY, "\t%s\n",
1800                                         attrarray[i].an_name.bv_val, 0, 0 );
1801 #endif
1802                 }
1803                 temp++;
1804                 temp->querystr.bv_val = NULL;
1805                 cm->numtemplates++;
1806         }
1807         /* anything else */
1808         else {
1809                 be->be_private = cm->be_private;
1810                 i = cm->bi->bi_db_config( be, fname, lineno, argc, argv );
1811                 be->be_private = private;
1812                 return i;
1813         }
1814         return 0;
1815 }
1816
1817 static int
1818 proxy_cache_init(
1819         BackendDB *be
1820 )
1821 {
1822         slap_overinst *on = (slap_overinst *)be->bd_info;
1823         cache_manager *cm;
1824         query_manager *qm;
1825
1826         cm = (cache_manager *)ch_malloc(sizeof(cache_manager));
1827         on->on_bi.bi_private = cm;
1828
1829         qm = (query_manager*)ch_malloc(sizeof(query_manager));
1830
1831         cm->qm = qm;
1832         cm->numattrsets = 0;
1833         cm->numtemplates = 0;
1834         cm->num_entries_limit = 5;
1835         cm->num_cached_queries = 0;
1836         cm->max_entries = 0;
1837         cm->cur_entries = 0;
1838         cm->max_queries = 10000;
1839         cm->cc_thread_started = 0;
1840         cm->cc_period = 1000;
1841
1842         qm->attr_sets = NULL;
1843         qm->templates = NULL;
1844         qm->lru_top = NULL;
1845         qm->lru_bottom = NULL;
1846
1847         qm->qcfunc = query_containment;
1848         qm->crfunc = cache_replacement;
1849         qm->addfunc = add_query;
1850         ldap_pvt_thread_mutex_init(&qm->lru_mutex);
1851
1852         ldap_pvt_thread_mutex_init(&cm->cache_mutex);
1853         ldap_pvt_thread_mutex_init(&cm->remove_mutex);
1854         return 0;
1855 }
1856
1857 static int
1858 proxy_cache_open(
1859         BackendDB *be
1860 )
1861 {
1862         slap_overinst *on = (slap_overinst *)be->bd_info;
1863         cache_manager *cm = on->on_bi.bi_private;
1864         void *private = be->be_private;
1865         int rc = 0;
1866
1867         if ( cm->be_private && cm->bi->bi_db_open ) {
1868                 be->be_private = cm->be_private;
1869                 rc = cm->bi->bi_db_open( be );
1870                 be->be_private = private;
1871         }
1872         return rc;
1873 }
1874
1875 static int
1876 proxy_cache_close(
1877         BackendDB *be
1878 )
1879 {
1880         slap_overinst *on = (slap_overinst *)be->bd_info;
1881         cache_manager *cm = on->on_bi.bi_private;
1882         void *private = be->be_private;
1883         int rc = 0;
1884
1885         if ( cm->be_private && cm->bi->bi_db_close ) {
1886                 be->be_private = cm->be_private;
1887                 rc = cm->bi->bi_db_close( be );
1888                 be->be_private = private;
1889         }
1890         return rc;
1891 }
1892
1893 static int
1894 proxy_cache_destroy(
1895         BackendDB *be
1896 )
1897 {
1898         slap_overinst *on = (slap_overinst *)be->bd_info;
1899         cache_manager *cm = on->on_bi.bi_private;
1900         void *private = be->be_private;
1901         int rc = 0;
1902
1903         if ( cm->be_private && cm->bi->bi_db_destroy ) {
1904                 be->be_private = cm->be_private;
1905                 rc = cm->bi->bi_db_destroy( be );
1906                 be->be_private = private;
1907         }
1908         free( cm );
1909         return rc;
1910 }
1911
1912 static void
1913 find_supersets ( struct attr_set* attr_sets, int numsets )
1914 {
1915         int num[MAX_ATTR_SETS];
1916         int i, j, res;
1917         int* id_array;
1918         for ( i = 0; i < MAX_ATTR_SETS; i++ )
1919                 num[i] = 0;
1920
1921         for ( i = 0; i < numsets; i++ ) {
1922                 attr_sets[i].ID_array = (int*) ch_malloc( sizeof( int ) );
1923                 attr_sets[i].ID_array[0] = -1;
1924         }
1925
1926         for ( i = 0; i < numsets; i++ ) {
1927                 for ( j=i+1; j < numsets; j++ ) {
1928                         res = compare_sets( attr_sets, i, j );
1929                         switch ( res ) {
1930                         case 0:
1931                                 break;
1932                         case 3:
1933                         case 1:
1934                                 id_array = attr_sets[i].ID_array;
1935                                 attr_sets[i].ID_array = (int *) ch_realloc( id_array,
1936                                                         ( num[i] + 2 ) * sizeof( int ));
1937                                 attr_sets[i].ID_array[num[i]] = j;
1938                                 attr_sets[i].ID_array[num[i]+1] = -1;
1939                                 num[i]++;
1940                                 if (res == 1)
1941                                         break;
1942                         case 2:
1943                                 id_array = attr_sets[j].ID_array;
1944                                 attr_sets[j].ID_array = (int *) ch_realloc( id_array,
1945                                                 ( num[j] + 2 ) * sizeof( int ));
1946                                 attr_sets[j].ID_array[num[j]] = i;
1947                                 attr_sets[j].ID_array[num[j]+1] = -1;
1948                                 num[j]++;
1949                                 break;
1950                         }
1951                 }
1952         }
1953 }
1954
1955 /*
1956  * compares two sets of attributes (indices i and j)
1957  * returns 0: if neither set is contained in the other set
1958  *         1: if set i is contained in set j
1959  *         2: if set j is contained in set i
1960  *         3: the sets are equivalent
1961  */
1962
1963 static int
1964 compare_sets(struct attr_set* set, int i, int j)
1965 {
1966         int k,l,numI,numJ;
1967         int common=0;
1968         int result=0;
1969
1970         if (( set[i].attrs == NULL ) && ( set[j].attrs == NULL ))
1971                 return 3;
1972
1973         if ( set[i].attrs == NULL )
1974                 return 2;
1975
1976         if ( set[j].attrs == NULL )
1977                 return 1;
1978
1979         numI = set[i].count;
1980         numJ = set[j].count;
1981
1982         for ( l=0; l < numI; l++ ) {
1983                 for ( k = 0; k < numJ; k++ ) {
1984                         if ( strcmp( set[i].attrs[l].an_name.bv_val,
1985                                      set[j].attrs[k].an_name.bv_val ) == 0 )
1986                                 common++;
1987                 }
1988         }
1989
1990         if ( common == numI )
1991                 result = 1;
1992
1993         if ( common == numJ )
1994                 result += 2;
1995
1996         return result;
1997 }
1998
1999 static slap_overinst proxy_cache;
2000
2001 int pcache_init()
2002 {
2003         LDAPAttributeType *at;
2004         int code;
2005         const char *err;
2006
2007         at = ldap_str2attributetype( queryid_schema, &code, &err,
2008                 LDAP_SCHEMA_ALLOW_ALL );
2009         if ( !at ) {
2010                 fprintf( stderr, "AttributeType Load failed %s %s\n",
2011                         ldap_scherr2str(code), err );
2012                 return code;
2013         }
2014         code = at_add( at, &err );
2015         if ( !code ) {
2016                 slap_str2ad( at->at_names[0], &ad_queryid, &err );
2017         }
2018         ldap_memfree( at );
2019         if ( code ) {
2020                 fprintf( stderr, "AttributeType Load failed %s %s\n",
2021                         scherr2str(code), err );
2022                 return code;
2023         }
2024
2025         proxy_cache.on_bi.bi_type = "proxycache";
2026         proxy_cache.on_bi.bi_db_init = proxy_cache_init;
2027         proxy_cache.on_bi.bi_db_config = proxy_cache_config;
2028         proxy_cache.on_bi.bi_db_open = proxy_cache_open;
2029         proxy_cache.on_bi.bi_db_close = proxy_cache_close;
2030         proxy_cache.on_bi.bi_db_destroy = proxy_cache_destroy;
2031         proxy_cache.on_bi.bi_op_search = proxy_cache_search;
2032
2033         return overlay_register( &proxy_cache );
2034 }
2035
2036 #if SLAPD_OVER_PROXYCACHE == SLAPD_MOD_DYNAMIC
2037 int init_module(int argc, char *argv[]) {
2038         return pcache_init();
2039 }
2040 #endif
2041
2042 #endif  /* defined(SLAPD_OVER_PROXYCACHE) */