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

   1 /* syncprov.c - syncrepl provider */
   2 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   3  *
   4  * Copyright 2004 The OpenLDAP Foundation.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted only as authorized by the OpenLDAP
   9  * Public License.
  10  *
  11  * A copy of this license is available in the file LICENSE in the
  12  * top-level directory of the distribution or, alternatively, at
  13  * <http://www.OpenLDAP.org/license.html>.
  14  */
  15 /* ACKNOWLEDGEMENTS:
  16  * This work was initially developed by Howard Chu for inclusion in
  17  * OpenLDAP Software.
  18  */
  19
  20 #include "portable.h"
  21
  22 #ifdef SLAPD_OVER_SYNCPROV
  23
  24 #include <ac/string.h>
  25 #include "lutil.h"
  26 #include "slap.h"
  27
  28 /* A modify request on a particular entry */
  29 typedef struct modinst {
  30         struct modinst *mi_next;
  31         Operation *mi_op;
  32 } modinst;
  33
  34 typedef struct modtarget {
  35         struct modinst *mt_mods;
  36         struct modinst *mt_tail;
  37         Operation *mt_op;
  38         ldap_pvt_thread_mutex_t mt_mutex;
  39 } modtarget;
  40
  41 /* A queued result of a persistent search */
  42 typedef struct syncres {
  43         struct syncres *s_next;
  44         struct berval s_dn;
  45         struct berval s_ndn;
  46         struct berval s_uuid;
  47         struct berval s_csn;
  48         char s_mode;
  49         char s_isreference;
  50 } syncres;
  51
  52 /* Record of a persistent search */
  53 typedef struct syncops {
  54         struct syncops *s_next;
  55         struct berval   s_base;         /* ndn of search base */
  56         ID              s_eid;          /* entryID of search base */
  57         Operation       *s_op;          /* search op */
  58         long    s_sid;
  59         long    s_rid;
  60         struct berval s_filterstr;
  61         int             s_flags;        /* search status */
  62         int             s_inuse;        /* reference count */
  63         struct syncres *s_res;
  64         struct syncres *s_restail;
  65         ldap_pvt_thread_mutex_t s_mutex;
  66 } syncops;
  67
  68 /* A received sync control */
  69 typedef struct sync_control {
  70         struct sync_cookie sr_state;
  71         int sr_rhint;
  72 } sync_control;
  73
  74 #if 0 /* moved back to slap.h */
  75 #define o_sync  o_ctrlflag[slap_cids.sc_LDAPsync]
  76 #endif
  77 /* o_sync_mode uses data bits of o_sync */
  78 #define o_sync_mode     o_ctrlflag[slap_cids.sc_LDAPsync]
  79
  80 #define SLAP_SYNC_NONE                                  (LDAP_SYNC_NONE<<SLAP_CONTROL_SHIFT)
  81 #define SLAP_SYNC_REFRESH                               (LDAP_SYNC_REFRESH_ONLY<<SLAP_CONTROL_SHIFT)
  82 #define SLAP_SYNC_PERSIST                               (LDAP_SYNC_RESERVED<<SLAP_CONTROL_SHIFT)
  83 #define SLAP_SYNC_REFRESH_AND_PERSIST   (LDAP_SYNC_REFRESH_AND_PERSIST<<SLAP_CONTROL_SHIFT)
  84
  85 #define PS_IS_REFRESHING        0x01
  86
  87 /* Record of which searches matched at premodify step */
  88 typedef struct syncmatches {
  89         struct syncmatches *sm_next;
  90         syncops *sm_op;
  91 } syncmatches;
  92
  93 /* The main state for this overlay */
  94 typedef struct syncprov_info_t {
  95         syncops         *si_ops;
  96         struct berval   si_ctxcsn;      /* ldapsync context */
  97         int             si_chkops;      /* checkpointing info */
  98         int             si_chktime;
  99         int             si_numops;      /* number of ops since last checkpoint */
 100         time_t  si_chklast;     /* time of last checkpoint */
 101         Avlnode *si_mods;       /* entries being modified */
 102         ldap_pvt_thread_mutex_t si_csn_mutex;
 103         ldap_pvt_thread_mutex_t si_ops_mutex;
 104         ldap_pvt_thread_rdwr_t  si_mods_rwlock;
 105         char            si_ctxcsnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 106 } syncprov_info_t;
 107
 108 typedef struct opcookie {
 109         slap_overinst *son;
 110         syncmatches *smatches;
 111         struct berval sdn;      /* DN of entry, for deletes */
 112         struct berval sndn;
 113         struct berval suuid;    /* UUID of entry */
 114         struct berval sctxcsn;
 115         int sreference; /* Is the entry a reference? */
 116 } opcookie;
 117
 118 typedef struct fbase_cookie {
 119         struct berval *fdn;     /* DN of a modified entry, for scope testing */
 120         syncops *fss;   /* persistent search we're testing against */
 121         int fbase;      /* if TRUE we found the search base and it's still valid */
 122         int fscope;     /* if TRUE then fdn is within the psearch scope */
 123 } fbase_cookie;
 124
 125 static AttributeName csn_anlist[2];
 126 static AttributeName uuid_anlist[2];
 127
 128 /* Build a LDAPsync intermediate state control */
 129 static int
 130 syncprov_state_ctrl(
 131         Operation       *op,
 132         SlapReply       *rs,
 133         Entry           *e,
 134         int             entry_sync_state,
 135         LDAPControl     **ctrls,
 136         int             num_ctrls,
 137         int             send_cookie,
 138         struct berval   *cookie )
 139 {
 140         Attribute* a;
 141         int ret;
 142         int res;
 143         const char *text = NULL;
 144
 145         BerElementBuffer berbuf;
 146         BerElement *ber = (BerElement *)&berbuf;
 147
 148         struct berval   entryuuid_bv = BER_BVNULL;
 149
 150         ber_init2( ber, 0, LBER_USE_DER );
 151         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 152
 153         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 154
 155         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 156                 AttributeDescription *desc = a->a_desc;
 157                 if ( desc == slap_schema.si_ad_entryUUID ) {
 158                         entryuuid_bv = a->a_nvals[0];
 159                         break;
 160                 }
 161         }
 162
 163         if ( send_cookie && cookie ) {
 164                 ber_printf( ber, "{eOON}",
 165                         entry_sync_state, &entryuuid_bv, cookie );
 166         } else {
 167                 ber_printf( ber, "{eON}",
 168                         entry_sync_state, &entryuuid_bv );
 169         }
 170
 171         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 172         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 173         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 174
 175         ber_free_buf( ber );
 176
 177         if ( ret < 0 ) {
 178                 Debug( LDAP_DEBUG_TRACE,
 179                         "slap_build_sync_ctrl: ber_flatten2 failed\n",
 180                         0, 0, 0 );
 181                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 182                 return ret;
 183         }
 184
 185         return LDAP_SUCCESS;
 186 }
 187
 188 /* Build a LDAPsync final state control */
 189 static int
 190 syncprov_done_ctrl(
 191         Operation       *op,
 192         SlapReply       *rs,
 193         LDAPControl     **ctrls,
 194         int                     num_ctrls,
 195         int                     send_cookie,
 196         struct berval *cookie,
 197         int                     refreshDeletes )
 198 {
 199         int ret;
 200         BerElementBuffer berbuf;
 201         BerElement *ber = (BerElement *)&berbuf;
 202
 203         ber_init2( ber, NULL, LBER_USE_DER );
 204         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 205
 206         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 207
 208         ber_printf( ber, "{" );
 209         if ( send_cookie && cookie ) {
 210                 ber_printf( ber, "O", cookie );
 211         }
 212         if ( refreshDeletes == LDAP_SYNC_REFRESH_DELETES ) {
 213                 ber_printf( ber, "b", refreshDeletes );
 214         }
 215         ber_printf( ber, "N}" );
 216
 217         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_DONE;
 218         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 219         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 220
 221         ber_free_buf( ber );
 222
 223         if ( ret < 0 ) {
 224                 Debug( LDAP_DEBUG_TRACE,
 225                         "syncprov_done_ctrl: ber_flatten2 failed\n",
 226                         0, 0, 0 );
 227                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 228                 return ret;
 229         }
 230
 231         return LDAP_SUCCESS;
 232 }
 233
 234 #if 0
 235 /* Generate state based on session log - not implemented yet */
 236 static int
 237 syncprov_state_ctrl_from_slog(
 238         Operation       *op,
 239         SlapReply       *rs,
 240         struct slog_entry *slog_e,
 241         int                     entry_sync_state,
 242         LDAPControl     **ctrls,
 243         int                     num_ctrls,
 244         int                     send_cookie,
 245         struct berval   *cookie)
 246 {
 247         Attribute* a;
 248         int ret;
 249         int res;
 250         const char *text = NULL;
 251
 252         BerElementBuffer berbuf;
 253         BerElement *ber = (BerElement *)&berbuf;
 254
 255         struct berval entryuuid_bv      = BER_BVNULL;
 256
 257         ber_init2( ber, NULL, LBER_USE_DER );
 258         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 259
 260         ctrls[num_ctrls] = ch_malloc ( sizeof ( LDAPControl ) );
 261
 262         entryuuid_bv = slog_e->sl_uuid;
 263
 264         if ( send_cookie && cookie ) {
 265                 ber_printf( ber, "{eOON}",
 266                         entry_sync_state, &entryuuid_bv, cookie );
 267         } else {
 268                 ber_printf( ber, "{eON}",
 269                         entry_sync_state, &entryuuid_bv );
 270         }
 271
 272         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 273         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 274         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 275
 276         ber_free_buf( ber );
 277
 278         if ( ret < 0 ) {
 279                 Debug( LDAP_DEBUG_TRACE,
 280                         "slap_build_sync_ctrl: ber_flatten2 failed\n",
 281                         0, 0, 0 );
 282                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 283                 return ret;
 284         }
 285
 286         return LDAP_SUCCESS;
 287 }
 288 #endif
 289
 290 static int
 291 syncprov_sendinfo(
 292         Operation       *op,
 293         SlapReply       *rs,
 294         int                     type,
 295         struct berval *cookie,
 296         int                     refreshDone,
 297         BerVarray       syncUUIDs,
 298         int                     refreshDeletes )
 299 {
 300         BerElementBuffer berbuf;
 301         BerElement *ber = (BerElement *)&berbuf;
 302         struct berval rspdata;
 303
 304         int ret;
 305
 306         ber_init2( ber, NULL, LBER_USE_DER );
 307         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 308
 309         if ( type ) {
 310                 switch ( type ) {
 311                 case LDAP_TAG_SYNC_NEW_COOKIE:
 312                         ber_printf( ber, "tO", type, cookie );
 313                         break;
 314                 case LDAP_TAG_SYNC_REFRESH_DELETE:
 315                 case LDAP_TAG_SYNC_REFRESH_PRESENT:
 316                         ber_printf( ber, "t{", type );
 317                         if ( cookie ) {
 318                                 ber_printf( ber, "O", cookie );
 319                         }
 320                         if ( refreshDone == 0 ) {
 321                                 ber_printf( ber, "b", refreshDone );
 322                         }
 323                         ber_printf( ber, "N}" );
 324                         break;
 325                 case LDAP_TAG_SYNC_ID_SET:
 326                         ber_printf( ber, "t{", type );
 327                         if ( cookie ) {
 328                                 ber_printf( ber, "O", cookie );
 329                         }
 330                         if ( refreshDeletes == 1 ) {
 331                                 ber_printf( ber, "b", refreshDeletes );
 332                         }
 333                         ber_printf( ber, "[W]", syncUUIDs );
 334                         ber_printf( ber, "N}" );
 335                         break;
 336                 default:
 337                         Debug( LDAP_DEBUG_TRACE,
 338                                 "syncprov_sendinfo: invalid syncinfo type (%d)\n",
 339                                 type, 0, 0 );
 340                         return LDAP_OTHER;
 341                 }
 342         }
 343
 344         ret = ber_flatten2( ber, &rspdata, 0 );
 345
 346         if ( ret < 0 ) {
 347                 Debug( LDAP_DEBUG_TRACE,
 348                         "syncprov_sendinfo: ber_flatten2 failed\n",
 349                         0, 0, 0 );
 350                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 351                 return ret;
 352         }
 353
 354         rs->sr_rspoid = LDAP_SYNC_INFO;
 355         rs->sr_rspdata = &rspdata;
 356         send_ldap_intermediate( op, rs );
 357         rs->sr_rspdata = NULL;
 358         ber_free_buf( ber );
 359
 360         return LDAP_SUCCESS;
 361 }
 362
 363 /* Find a modtarget in an AVL tree */
 364 static int
 365 sp_avl_cmp( const void *c1, const void *c2 )
 366 {
 367         const modtarget *m1, *m2;
 368         int rc;
 369
 370         m1 = c1; m2 = c2;
 371         rc = m1->mt_op->o_req_ndn.bv_len - m2->mt_op->o_req_ndn.bv_len;
 372
 373         if ( rc ) return rc;
 374         return ber_bvcmp( &m1->mt_op->o_req_ndn, &m2->mt_op->o_req_ndn );
 375 }
 376
 377 /* syncprov_findbase:
 378  *   finds the true DN of the base of a search (with alias dereferencing) and
 379  * checks to make sure the base entry doesn't get replaced with a different
 380  * entry (e.g., swapping trees via ModDN, or retargeting an alias). If a
 381  * change is detected, any persistent search on this base must be terminated /
 382  * reloaded.
 383  *   On the first call, we just save the DN and entryID. On subsequent calls
 384  * we compare the DN and entryID with the saved values.
 385  */
 386 static int
 387 findbase_cb( Operation *op, SlapReply *rs )
 388 {
 389         slap_callback *sc = op->o_callback;
 390
 391         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 392                 fbase_cookie *fc = sc->sc_private;
 393
 394                 /* If no entryID, we're looking for the first time.
 395                  * Just store whatever we got.
 396                  */
 397                 if ( fc->fss->s_eid == NOID ) {
 398                         fc->fbase = 1;
 399                         fc->fss->s_eid = rs->sr_entry->e_id;
 400                         ber_dupbv( &fc->fss->s_base, &rs->sr_entry->e_nname );
 401
 402                 } else if ( rs->sr_entry->e_id == fc->fss->s_eid &&
 403                         dn_match( &rs->sr_entry->e_nname, &fc->fss->s_base )) {
 404
 405                 /* OK, the DN is the same and the entryID is the same. Now
 406                  * see if the fdn resides in the scope.
 407                  */
 408                         fc->fbase = 1;
 409                         switch ( fc->fss->s_op->ors_scope ) {
 410                         case LDAP_SCOPE_BASE:
 411                                 fc->fscope = dn_match( fc->fdn, &rs->sr_entry->e_nname );
 412                                 break;
 413                         case LDAP_SCOPE_ONELEVEL: {
 414                                 struct berval pdn;
 415                                 dnParent( fc->fdn, &pdn );
 416                                 fc->fscope = dn_match( &pdn, &rs->sr_entry->e_nname );
 417                                 break; }
 418                         case LDAP_SCOPE_SUBTREE:
 419                                 fc->fscope = dnIsSuffix( fc->fdn, &rs->sr_entry->e_nname );
 420                                 break;
 421 #ifdef LDAP_SCOPE_SUBORDINATE
 422                         case LDAP_SCOPE_SUBORDINATE:
 423                                 fc->fscope = dnIsSuffix( fc->fdn, &rs->sr_entry->e_nname ) &&
 424                                         !dn_match( fc->fdn, &rs->sr_entry->e_nname );
 425                                 break;
 426 #endif
 427                         }
 428                 }
 429         }
 430         if ( rs->sr_err != LDAP_SUCCESS ) {
 431                 Debug( LDAP_DEBUG_ANY, "findbase failed! %d\n", rs->sr_err,0,0 );
 432         }
 433         return LDAP_SUCCESS;
 434 }
 435
 436 static int
 437 syncprov_findbase( Operation *op, fbase_cookie *fc )
 438 {
 439         opcookie *opc = op->o_callback->sc_private;
 440         slap_overinst *on = opc->son;
 441         syncprov_info_t         *si = on->on_bi.bi_private;
 442
 443         slap_callback cb = {0};
 444         Operation fop;
 445         SlapReply frs = { REP_RESULT };
 446         int rc;
 447
 448         fop = *op;
 449
 450         cb.sc_response = findbase_cb;
 451         cb.sc_private = fc;
 452
 453         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync mode */
 454         fop.o_callback = &cb;
 455         fop.o_tag = LDAP_REQ_SEARCH;
 456         fop.ors_scope = LDAP_SCOPE_BASE;
 457         fop.ors_deref = fc->fss->s_op->ors_deref;
 458         fop.ors_limit = NULL;
 459         fop.ors_slimit = 1;
 460         fop.ors_tlimit = SLAP_NO_LIMIT;
 461         fop.ors_attrs = slap_anlist_no_attrs;
 462         fop.ors_attrsonly = 1;
 463         fop.ors_filter = fc->fss->s_op->ors_filter;
 464         fop.ors_filterstr = fc->fss->s_op->ors_filterstr;
 465
 466         fop.o_req_ndn = fc->fss->s_op->o_req_ndn;
 467
 468         fop.o_bd->bd_info = on->on_info->oi_orig;
 469         rc = fop.o_bd->be_search( &fop, &frs );
 470         fop.o_bd->bd_info = (BackendInfo *)on;
 471
 472         if ( fc->fbase ) return LDAP_SUCCESS;
 473
 474         /* If entryID has changed, then the base of this search has
 475          * changed. Invalidate the psearch.
 476          */
 477         return LDAP_NO_SUCH_OBJECT;
 478 }
 479
 480 /* syncprov_findcsn:
 481  *   This function has two different purposes, but they both use a search
 482  * that filters on entryCSN so they're combined here.
 483  * 1: when the current contextCSN is known and we have a sync cookie, we search
 484  * for one entry with CSN <= the cookie CSN. (Used to search for =.) If an
 485  * entry is found, the cookie CSN is valid, otherwise it is stale.
 486  *
 487  * 2: during a refresh phase, we search for all entries with CSN <= the cookie
 488  * CSN, and generate Present records for them. We always collect this result
 489  * in SyncID sets, even if there's only one match.
 490  */
 491 #define FIND_CSN        1
 492 #define FIND_PRESENT    2
 493
 494 static int
 495 findcsn_cb( Operation *op, SlapReply *rs )
 496 {
 497         slap_callback *sc = op->o_callback;
 498
 499         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 500                 sc->sc_private = (void *)1;
 501         }
 502         return LDAP_SUCCESS;
 503 }
 504
 505 /* Build a list of entryUUIDs for sending in a SyncID set */
 506
 507 typedef struct fpres_cookie {
 508         int num;
 509         BerVarray uuids;
 510 } fpres_cookie;
 511
 512 static int
 513 findpres_cb( Operation *op, SlapReply *rs )
 514 {
 515         slap_callback *sc = op->o_callback;
 516         fpres_cookie *pc = sc->sc_private;
 517         int ret = SLAP_CB_CONTINUE;
 518
 519         if ( rs->sr_type == REP_SEARCH ) {
 520                 ret = slap_build_syncUUID_set( op, &pc->uuids, rs->sr_entry );
 521                 if ( ret > 0 ) {
 522                         pc->num++;
 523                         ret = LDAP_SUCCESS;
 524                         if ( pc->num == SLAP_SYNCUUID_SET_SIZE ) {
 525                                 ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 526                                         0, pc->uuids, 0 );
 527                                 ber_bvarray_free_x( pc->uuids, op->o_tmpmemctx );
 528                                 pc->uuids = NULL;
 529                                 pc->num = 0;
 530                         }
 531                 } else {
 532                         ret = LDAP_OTHER;
 533                 }
 534         } else if ( rs->sr_type == REP_RESULT ) {
 535                 ret = rs->sr_err;
 536                 if ( pc->num ) {
 537                         ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 538                                 0, pc->uuids, 0 );
 539                         ber_bvarray_free_x( pc->uuids, op->o_tmpmemctx );
 540                         pc->uuids = NULL;
 541                         pc->num = 0;
 542                 }
 543         }
 544         return ret;
 545 }
 546
 547
 548 static int
 549 syncprov_findcsn( Operation *op, int mode )
 550 {
 551         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 552         syncprov_info_t         *si = on->on_bi.bi_private;
 553
 554         slap_callback cb = {0};
 555         Operation fop;
 556         SlapReply frs = { REP_RESULT };
 557         char buf[LDAP_LUTIL_CSNSTR_BUFSIZE + STRLENOF("(entryCSN<=)")];
 558         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 559         struct berval fbuf;
 560         Filter cf;
 561         AttributeAssertion eq;
 562         int rc;
 563         fpres_cookie pcookie;
 564         int locked = 0;
 565         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
 566
 567         if ( srs->sr_state.ctxcsn->bv_len >= LDAP_LUTIL_CSNSTR_BUFSIZE ) {
 568                 return LDAP_OTHER;
 569         }
 570
 571         fop = *op;
 572         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync_mode */
 573
 574         fbuf.bv_val = buf;
 575         if ( mode == FIND_CSN ) {
 576                 fop.ors_attrsonly = 1;
 577                 fop.ors_attrs = slap_anlist_no_attrs;
 578                 fop.ors_slimit = 1;
 579                 cb.sc_private = NULL;
 580                 cb.sc_response = findcsn_cb;
 581
 582         } else if ( mode == FIND_PRESENT ) {
 583                 fop.ors_attrsonly = 0;
 584                 fop.ors_attrs = uuid_anlist;
 585                 fop.ors_slimit = SLAP_NO_LIMIT;
 586                 /* We want pure entries, not referrals */
 587                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 588                 cb.sc_private = &pcookie;
 589                 cb.sc_response = findpres_cb;
 590                 pcookie.num = 0;
 591                 pcookie.uuids = NULL;
 592         }
 593         cf.f_choice = LDAP_FILTER_LE;
 594         cf.f_ava = &eq;
 595         cf.f_av_desc = slap_schema.si_ad_entryCSN;
 596         cf.f_av_value = *srs->sr_state.ctxcsn;
 597         cf.f_next = NULL;
 598         fbuf.bv_len = sprintf( buf, "(entryCSN<=%s)",
 599                 srs->sr_state.ctxcsn->bv_val );
 600
 601         fop.o_callback = &cb;
 602         fop.ors_limit = NULL;
 603         fop.ors_tlimit = SLAP_NO_LIMIT;
 604         fop.ors_filter = &cf;
 605         fop.ors_filterstr = fbuf;
 606
 607         fop.o_bd->bd_info = on->on_info->oi_orig;
 608         rc = fop.o_bd->be_search( &fop, &frs );
 609         fop.o_bd->bd_info = (BackendInfo *)on;
 610
 611         if ( mode == FIND_CSN ) {
 612                 if ( cb.sc_private ) return LDAP_SUCCESS;
 613         } else if ( mode == FIND_PRESENT ) {
 614                 return LDAP_SUCCESS;
 615         }
 616
 617         /* If matching CSN was not found, invalidate the context. */
 618         return LDAP_NO_SUCH_OBJECT;
 619 }
 620
 621 /* Queue a persistent search response if still in Refresh stage */
 622 static int
 623 syncprov_qresp( opcookie *opc, syncops *so, int mode )
 624 {
 625         syncres *sr;
 626
 627         sr = ch_malloc(sizeof(syncres) + opc->suuid.bv_len + 1 +
 628                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1 + opc->sctxcsn.bv_len + 1 );
 629         sr->s_next = NULL;
 630         sr->s_dn.bv_val = (char *)(sr + 1);
 631         sr->s_mode = mode;
 632         sr->s_isreference = opc->sreference;
 633         sr->s_ndn.bv_val = lutil_strcopy( sr->s_dn.bv_val, opc->sdn.bv_val );
 634         *(sr->s_ndn.bv_val++) = '\0';
 635         sr->s_uuid.bv_val = lutil_strcopy( sr->s_ndn.bv_val, opc->sndn.bv_val );
 636         *(sr->s_uuid.bv_val++) = '\0';
 637         sr->s_csn.bv_val = lutil_strcopy( sr->s_uuid.bv_val, opc->suuid.bv_val );
 638
 639         if ( !so->s_res ) {
 640                 so->s_res = sr;
 641         } else {
 642                 so->s_restail->s_next = sr;
 643         }
 644         so->s_restail = sr;
 645         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 646         return LDAP_SUCCESS;
 647 }
 648
 649 /* Send a persistent search response */
 650 static int
 651 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so, Entry *e, int mode, int queue )
 652 {
 653         slap_overinst *on = opc->son;
 654         syncprov_info_t *si = on->on_bi.bi_private;
 655
 656         SlapReply rs = { REP_SEARCH };
 657         LDAPControl *ctrls[2];
 658         struct berval cookie;
 659         Entry e_uuid = {0};
 660         Attribute a_uuid = {0};
 661         Operation sop = *so->s_op;
 662         Opheader ohdr;
 663
 664         ohdr = *sop.o_hdr;
 665         sop.o_hdr = &ohdr;
 666         sop.o_tmpmemctx = op->o_tmpmemctx;
 667         sop.o_bd = op->o_bd;
 668         sop.o_controls = op->o_controls;
 669
 670         if ( queue && (so->s_flags & PS_IS_REFRESHING) ) {
 671                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 672                 if ( so->s_flags & PS_IS_REFRESHING )
 673                         return syncprov_qresp( opc, so, mode );
 674                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 675         }
 676
 677         ctrls[1] = NULL;
 678         slap_compose_sync_cookie( op, &cookie, &opc->sctxcsn,
 679                 so->s_sid, so->s_rid );
 680
 681         e_uuid.e_attrs = &a_uuid;
 682         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 683         a_uuid.a_nvals = &opc->suuid;
 684         rs.sr_err = syncprov_state_ctrl( &sop, &rs, &e_uuid,
 685                 mode, ctrls, 0, 1, &cookie );
 686
 687         rs.sr_entry = e;
 688         rs.sr_ctrls = ctrls;
 689         switch( mode ) {
 690         case LDAP_SYNC_ADD:
 691                 if ( opc->sreference ) {
 692                         rs.sr_ref = get_entry_referrals( &sop, e );
 693                         send_search_reference( &sop, &rs );
 694                         ber_bvarray_free( rs.sr_ref );
 695                         break;
 696                 }
 697                 /* fallthru */
 698         case LDAP_SYNC_MODIFY:
 699                 rs.sr_attrs = sop.ors_attrs;
 700                 send_search_entry( &sop, &rs );
 701                 break;
 702         case LDAP_SYNC_DELETE:
 703                 e_uuid.e_attrs = NULL;
 704                 e_uuid.e_name = opc->sdn;
 705                 e_uuid.e_nname = opc->sndn;
 706                 rs.sr_entry = &e_uuid;
 707                 if ( opc->sreference ) {
 708                         struct berval bv = BER_BVNULL;
 709                         rs.sr_ref = &bv;
 710                         send_search_reference( &sop, &rs );
 711                 } else {
 712                         send_search_entry( &sop, &rs );
 713                 }
 714                 break;
 715         default:
 716                 assert(0);
 717         }
 718         op->o_tmpfree( rs.sr_ctrls[0], op->o_tmpmemctx );
 719         rs.sr_ctrls = NULL;
 720         return rs.sr_err;
 721 }
 722
 723 static void
 724 syncprov_free_syncop( syncops *so )
 725 {
 726         syncres *sr, *srnext;
 727
 728         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 729         so->s_inuse--;
 730         if ( so->s_inuse > 0 ) {
 731                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 732                 return;
 733         }
 734         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 735         filter_free( so->s_op->ors_filter );
 736         ch_free( so->s_op );
 737         ch_free( so->s_base.bv_val );
 738         for ( sr=so->s_res; sr; sr=srnext ) {
 739                 srnext = sr->s_next;
 740                 ch_free( sr );
 741         }
 742         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 743         ch_free( so );
 744 }
 745
 746 static int
 747 syncprov_drop_psearch( syncops *so )
 748 {
 749         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
 750         so->s_op->o_conn->c_n_ops_executing--;
 751         so->s_op->o_conn->c_n_ops_completed++;
 752         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
 753         syncprov_free_syncop( so );
 754 }
 755
 756 static int
 757 syncprov_op_abandon( Operation *op, SlapReply *rs )
 758 {
 759         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 760         syncprov_info_t         *si = on->on_bi.bi_private;
 761         syncops *so, *soprev;
 762
 763         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
 764         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
 765                 soprev=so, so=so->s_next ) {
 766                 if ( so->s_op->o_connid == op->o_connid &&
 767                         so->s_op->o_msgid == op->orn_msgid ) {
 768                                 so->s_op->o_abandon = 1;
 769                                 soprev->s_next = so->s_next;
 770                                 break;
 771                 }
 772         }
 773         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
 774         if ( so ) {
 775                 /* Is this really a Cancel exop? */
 776                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
 777                         rs->sr_err = LDAP_CANCELLED;
 778                         send_ldap_result( so->s_op, rs );
 779                 }
 780                 syncprov_drop_psearch( so );
 781         }
 782         return SLAP_CB_CONTINUE;
 783 }
 784
 785 /* Find which persistent searches are affected by this operation */
 786 static void
 787 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
 788 {
 789         slap_overinst *on = opc->son;
 790         syncprov_info_t         *si = on->on_bi.bi_private;
 791
 792         fbase_cookie fc;
 793         syncops *ss, *sprev, *snext;
 794         Entry *e;
 795         Attribute *a;
 796         int rc;
 797         struct berval newdn;
 798
 799         fc.fdn = &op->o_req_ndn;
 800         /* compute new DN */
 801         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
 802                 struct berval pdn;
 803                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
 804                 else dnParent( fc.fdn, &pdn );
 805                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
 806                 fc.fdn = &newdn;
 807         }
 808         if ( op->o_tag != LDAP_REQ_ADD ) {
 809                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
 810                 rc = be_entry_get_rw( op, fc.fdn, NULL, NULL, 0, &e );
 811                 op->o_bd->bd_info = (BackendInfo *)on;
 812                 if ( rc ) return;
 813         } else {
 814                 e = op->ora_e;
 815         }
 816
 817         if ( saveit ) {
 818                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
 819                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
 820                 opc->sreference = is_entry_referral( e );
 821         }
 822         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
 823                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
 824                 if ( a )
 825                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
 826         }
 827
 828         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
 829         for (ss = si->si_ops, sprev = (syncops *)&si->si_ops; ss;
 830                 sprev = ss, ss=snext)
 831         {
 832                 syncmatches *sm;
 833                 int found = 0;
 834
 835                 snext = ss->s_next;
 836                 /* validate base */
 837                 fc.fss = ss;
 838                 fc.fbase = 0;
 839                 fc.fscope = 0;
 840
 841                 /* If the base of the search is missing, signal a refresh */
 842                 rc = syncprov_findbase( op, &fc );
 843                 if ( rc != LDAP_SUCCESS ) {
 844                         SlapReply rs = {REP_RESULT};
 845                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
 846                                 "search base has changed" );
 847                         sprev->s_next = snext;
 848                         syncprov_drop_psearch( ss );
 849                         continue;
 850                 }
 851
 852                 /* If we're sending results now, look for this op in old matches */
 853                 if ( !saveit ) {
 854                         syncmatches *old;
 855                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
 856                                 old=sm, sm=sm->sm_next ) {
 857                                 if ( sm->sm_op == ss ) {
 858                                         found = 1;
 859                                         old->sm_next = sm->sm_next;
 860                                         op->o_tmpfree( sm, op->o_tmpmemctx );
 861                                         break;
 862                                 }
 863                         }
 864                 }
 865
 866                 /* check if current o_req_dn is in scope and matches filter */
 867                 if ( fc.fscope && test_filter( op, e, ss->s_op->ors_filter ) ==
 868                         LDAP_COMPARE_TRUE ) {
 869                         if ( saveit ) {
 870                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
 871                                 sm->sm_next = opc->smatches;
 872                                 sm->sm_op = ss;
 873                                 ss->s_inuse++;
 874                                 opc->smatches = sm;
 875                         } else {
 876                                 /* if found send UPDATE else send ADD */
 877                                 syncprov_sendresp( op, opc, ss, e,
 878                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD, 1 );
 879                         }
 880                 } else if ( !saveit && found ) {
 881                         /* send DELETE */
 882                         syncprov_sendresp( op, opc, ss, NULL, LDAP_SYNC_DELETE, 1 );
 883                 }
 884         }
 885         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
 886         if ( op->o_tag != LDAP_REQ_ADD ) {
 887                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
 888                 be_entry_release_r( op, e );
 889                 op->o_bd->bd_info = (BackendInfo *)on;
 890         }
 891 }
 892
 893 static int
 894 syncprov_op_cleanup( Operation *op, SlapReply *rs )
 895 {
 896         slap_callback *cb = op->o_callback;
 897         opcookie *opc = cb->sc_private;
 898         slap_overinst *on = opc->son;
 899         syncprov_info_t         *si = on->on_bi.bi_private;
 900         syncmatches *sm, *snext;
 901         modtarget *mt, mtdummy;
 902
 903         for (sm = opc->smatches; sm; sm=snext) {
 904                 snext = sm->sm_next;
 905                 syncprov_free_syncop( sm->sm_op );
 906                 op->o_tmpfree( sm, op->o_tmpmemctx );
 907         }
 908
 909         /* Remove op from lock table */
 910         mtdummy.mt_op = op;
 911         ldap_pvt_thread_rdwr_rlock( &si->si_mods_rwlock );
 912         mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
 913         ldap_pvt_thread_rdwr_runlock( &si->si_mods_rwlock );
 914         if ( mt ) {
 915                 modinst *mi = mt->mt_mods;
 916
 917                 /* If there are more, promote the next one */
 918                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
 919                 if ( mi->mi_next ) {
 920                         mt->mt_mods = mi->mi_next;
 921                         mt->mt_op = mt->mt_mods->mi_op;
 922                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
 923                 } else {
 924                         ldap_pvt_thread_rdwr_wlock( &si->si_mods_rwlock );
 925                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
 926                         ldap_pvt_thread_rdwr_wunlock( &si->si_mods_rwlock );
 927                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
 928                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
 929                         ch_free( mt );
 930                 }
 931         }
 932         op->o_callback = cb->sc_next;
 933         op->o_tmpfree(cb, op->o_tmpmemctx);
 934 }
 935
 936 static void
 937 syncprov_checkpoint( Operation *op, SlapReply *rs, slap_overinst *on )
 938 {
 939         syncprov_info_t         *si = on->on_bi.bi_private;
 940         Modifications mod;
 941         Operation opm;
 942         struct berval bv[2];
 943         BackendInfo *orig;
 944         slap_callback cb = {0};
 945
 946         mod.sml_values = bv;
 947         bv[1].bv_val = NULL;
 948         bv[0] = si->si_ctxcsn;
 949         mod.sml_nvalues = NULL;
 950         mod.sml_desc = slap_schema.si_ad_contextCSN;
 951         mod.sml_op = LDAP_MOD_REPLACE;
 952         mod.sml_next = NULL;
 953
 954         cb.sc_response = slap_null_cb;
 955         opm = *op;
 956         opm.o_tag = LDAP_REQ_MODIFY;
 957         opm.o_callback = &cb;
 958         opm.orm_modlist = &mod;
 959         opm.o_req_dn = op->o_bd->be_suffix[0];
 960         opm.o_req_ndn = op->o_bd->be_nsuffix[0];
 961         orig = opm.o_bd->bd_info;
 962         opm.o_bd->bd_info = on->on_info->oi_orig;
 963         opm.o_bd->be_modify( &opm, rs );
 964 }
 965
 966 static int
 967 syncprov_op_response( Operation *op, SlapReply *rs )
 968 {
 969         opcookie *opc = op->o_callback->sc_private;
 970         slap_overinst *on = opc->son;
 971         syncprov_info_t         *si = on->on_bi.bi_private;
 972         syncmatches *sm;
 973
 974         if ( rs->sr_err == LDAP_SUCCESS )
 975         {
 976                 struct berval maxcsn;
 977                 char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 978
 979                 /* Update our context CSN */
 980                 cbuf[0] = '\0';
 981                 ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
 982                 slap_get_commit_csn( op, &maxcsn );
 983                 if ( !BER_BVISNULL( &maxcsn ) ) {
 984                         strcpy( cbuf, maxcsn.bv_val );
 985                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn ) > 0 ) {
 986                                 strcpy( si->si_ctxcsnbuf, cbuf );
 987                                 si->si_ctxcsn.bv_len = maxcsn.bv_len;
 988                         }
 989                 }
 990
 991                 si->si_numops++;
 992                 if ( si->si_chkops || si->si_chktime ) {
 993                         int do_check=0;
 994                         if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
 995                                 do_check = 1;
 996                                 si->si_numops = 0;
 997                         }
 998                         if ( si->si_chktime &&
 999                                 (op->o_time - si->si_chklast >= si->si_chktime )) {
1000                                 do_check = 1;
1001                                 si->si_chklast = op->o_time;
1002                         }
1003                         if ( do_check ) {
1004                                 syncprov_checkpoint( op, rs, on );
1005                         }
1006                 }
1007                 ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1008
1009                 opc->sctxcsn.bv_len = maxcsn.bv_len;
1010                 opc->sctxcsn.bv_val = cbuf;
1011
1012                 /* Handle any persistent searches */
1013                 if ( si->si_ops ) {
1014                         switch(op->o_tag) {
1015                         case LDAP_REQ_ADD:
1016                         case LDAP_REQ_MODIFY:
1017                         case LDAP_REQ_MODRDN:
1018                         case LDAP_REQ_EXTENDED:
1019                                 syncprov_matchops( op, opc, 0 );
1020                                 break;
1021                         case LDAP_REQ_DELETE:
1022                                 /* for each match in opc->smatches:
1023                                  *   send DELETE msg
1024                                  */
1025                                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1026                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1027                                         if ( sm->sm_op->s_op->o_abandon )
1028                                                 continue;
1029                                         syncprov_sendresp( op, opc, sm->sm_op, NULL,
1030                                                 LDAP_SYNC_DELETE, 1 );
1031                                 }
1032                                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1033                                 break;
1034                         }
1035                 }
1036
1037         }
1038         return SLAP_CB_CONTINUE;
1039 }
1040
1041 /* We don't use a subentry to store the context CSN any more.
1042  * We expose the current context CSN as an operational attribute
1043  * of the suffix entry.
1044  */
1045 static int
1046 syncprov_op_compare( Operation *op, SlapReply *rs )
1047 {
1048         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1049         syncprov_info_t         *si = on->on_bi.bi_private;
1050         int rc = SLAP_CB_CONTINUE;
1051
1052         if ( dn_match( &op->o_req_ndn, op->o_bd->be_nsuffix ) &&
1053                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1054         {
1055                 Entry e = {0};
1056                 Attribute a = {0};
1057                 struct berval bv[2];
1058
1059                 e.e_name = op->o_bd->be_suffix[0];
1060                 e.e_nname = op->o_bd->be_nsuffix[0];
1061
1062                 BER_BVZERO( &bv[1] );
1063                 bv[0] = si->si_ctxcsn;
1064
1065                 a.a_desc = slap_schema.si_ad_contextCSN;
1066                 a.a_vals = bv;
1067                 a.a_nvals = a.a_vals;
1068
1069                 ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1070
1071                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1072                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1073                 if ( ! rs->sr_err ) {
1074                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1075                         goto return_results;
1076                 }
1077
1078                 if ( get_assert( op ) &&
1079                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
1080                 {
1081                         rs->sr_err = LDAP_ASSERTION_FAILED;
1082                         goto return_results;
1083                 }
1084
1085
1086                 rs->sr_err = LDAP_COMPARE_FALSE;
1087
1088                 if ( value_find_ex( op->oq_compare.rs_ava->aa_desc,
1089                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
1090                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
1091                                 a.a_nvals, &op->oq_compare.rs_ava->aa_value, op->o_tmpmemctx ) == 0 )
1092                 {
1093                         rs->sr_err = LDAP_COMPARE_TRUE;
1094                 }
1095
1096 return_results:;
1097
1098                 ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1099
1100                 send_ldap_result( op, rs );
1101
1102                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
1103                         rs->sr_err = LDAP_SUCCESS;
1104                 }
1105                 rc = rs->sr_err;
1106         }
1107
1108         return rc;
1109 }
1110
1111 static int
1112 syncprov_op_mod( Operation *op, SlapReply *rs )
1113 {
1114         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1115         syncprov_info_t         *si = on->on_bi.bi_private;
1116
1117         slap_callback *cb = op->o_tmpcalloc(1, sizeof(slap_callback)+
1118                 sizeof(opcookie) +
1119                 (si->si_ops ? sizeof(modinst) : 0 ),
1120                 op->o_tmpmemctx);
1121         opcookie *opc = (opcookie *)(cb+1);
1122         opc->son = on;
1123         cb->sc_response = syncprov_op_response;
1124         cb->sc_cleanup = syncprov_op_cleanup;
1125         cb->sc_private = opc;
1126         cb->sc_next = op->o_callback;
1127         op->o_callback = cb;
1128
1129         /* If there are active persistent searches, lock this operation.
1130          * See seqmod.c for the locking logic on its own.
1131          */
1132         if ( si->si_ops ) {
1133                 modtarget *mt, mtdummy;
1134                 modinst *mi;
1135
1136                 mi = (modinst *)(opc+1);
1137                 mi->mi_op = op;
1138
1139                 /* See if we're already modifying this entry... */
1140                 mtdummy.mt_op = op;
1141                 ldap_pvt_thread_rdwr_wlock( &si->si_mods_rwlock );
1142                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1143                 if ( mt ) {
1144                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1145                         ldap_pvt_thread_rdwr_wunlock( &si->si_mods_rwlock );
1146                         mt->mt_tail->mi_next = mi;
1147                         mt->mt_tail = mi;
1148                         /* wait for this op to get to head of list */
1149                         while ( mt->mt_mods != mi ) {
1150                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1151                                 ldap_pvt_thread_yield();
1152                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1153                         }
1154                 } else {
1155                         /* Record that we're modifying this entry now */
1156                         mt = ch_malloc( sizeof(modtarget) );
1157                         mt->mt_mods = mi;
1158                         mt->mt_tail = mi;
1159                         mt->mt_op = mi->mi_op;
1160                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
1161                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
1162                         ldap_pvt_thread_rdwr_wunlock( &si->si_mods_rwlock );
1163                 }
1164
1165                 if ( op->o_tag != LDAP_REQ_ADD )
1166                         syncprov_matchops( op, opc, 1 );
1167         }
1168
1169         return SLAP_CB_CONTINUE;
1170 }
1171
1172 static int
1173 syncprov_op_extended( Operation *op, SlapReply *rs )
1174 {
1175         if ( exop_is_write( op ))
1176                 return syncprov_op_mod( op, rs );
1177
1178         return SLAP_CB_CONTINUE;
1179 }
1180
1181 typedef struct searchstate {
1182         slap_overinst *ss_on;
1183         syncops *ss_so;
1184 } searchstate;
1185
1186 static int
1187 syncprov_search_cleanup( Operation *op, SlapReply *rs )
1188 {
1189 #if 0
1190         if ( rs->sr_ctrls ) {
1191                 free( rs->sr_ctrls[0] );
1192                 op->o_tmpfree( rs->sr_ctrls, op->o_tmpmemctx );
1193                 rs->sr_ctrls = NULL;
1194         }
1195 #endif
1196         return 0;
1197 }
1198
1199 static void
1200 syncprov_detach_op( Operation *op, syncops *so )
1201 {
1202         Operation *op2;
1203         int i, alen = 0;
1204         size_t size;
1205         char *ptr;
1206
1207         /* count the search attrs */
1208         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1209                 alen += op->ors_attrs[i].an_name.bv_len + 1;
1210         }
1211         /* Make a new copy of the operation */
1212         size = sizeof(Operation) + sizeof(Opheader) +
1213                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
1214                 op->o_req_dn.bv_len + 1 +
1215                 op->o_req_ndn.bv_len + 1 +
1216                 op->o_ndn.bv_len + 1 +
1217                 so->s_filterstr.bv_len + 1;
1218         op2 = (Operation *)ch_malloc( size );
1219         *op2 = *op;
1220         op2->o_hdr = (Opheader *)(op2+1);
1221         *op2->o_hdr = *op->o_hdr;
1222         if ( i ) {
1223                 op2->ors_attrs = (AttributeName *)(op2->o_hdr + 1);
1224                 ptr = (char *)(op2->ors_attrs+i+1);
1225                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1226                         op2->ors_attrs[i] = op->ors_attrs[i];
1227                         op2->ors_attrs[i].an_name.bv_val = ptr;
1228                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
1229                 }
1230                 BER_BVZERO( &op2->ors_attrs[i].an_name );
1231         } else {
1232                 ptr = (char *)(op2->o_hdr + 1);
1233         }
1234         op2->o_ndn.bv_val = ptr;
1235         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
1236         op2->o_dn = op2->o_ndn;
1237         op2->o_req_dn.bv_val = ptr;
1238         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
1239         op2->o_req_ndn.bv_val = ptr;
1240         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
1241         op2->ors_filterstr.bv_val = ptr;
1242         strcpy( ptr, so->s_filterstr.bv_val );
1243         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
1244         op2->ors_filter = str2filter( ptr );
1245         op2->o_controls = NULL;
1246         op2->o_callback = NULL;
1247         so->s_op = op2;
1248
1249         /* Increment number of ops so that idletimeout ignores us */
1250         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
1251         op->o_conn->c_n_ops_executing++;
1252         op->o_conn->c_n_ops_completed--;
1253         ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
1254 }
1255
1256 static int
1257 syncprov_search_response( Operation *op, SlapReply *rs )
1258 {
1259         searchstate *ss = op->o_callback->sc_private;
1260         slap_overinst *on = ss->ss_on;
1261         syncprov_info_t         *si = on->on_bi.bi_private;
1262         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
1263
1264         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
1265                 int i;
1266                 if ( srs->sr_state.ctxcsn ) {
1267                         Attribute *a = attr_find( rs->sr_entry->e_attrs,
1268                                 slap_schema.si_ad_entryCSN );
1269                         /* Don't send the ctx entry twice */
1270                         if ( bvmatch( &a->a_nvals[0], srs->sr_state.ctxcsn ))
1271                                 return LDAP_SUCCESS;
1272                 }
1273                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1274                         op->o_tmpmemctx );
1275                 rs->sr_ctrls[1] = NULL;
1276                 rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
1277                         LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
1278         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
1279                 struct berval cookie;
1280
1281                 slap_compose_sync_cookie( op, &cookie,
1282                         &op->ors_filter->f_and->f_ava->aa_value,
1283                         srs->sr_state.sid, srs->sr_state.rid );
1284
1285                 /* Is this a regular refresh? */
1286                 if ( !ss->ss_so ) {
1287                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1288                                 op->o_tmpmemctx );
1289                         rs->sr_ctrls[1] = NULL;
1290                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
1291                                 0, 1, &cookie, LDAP_SYNC_REFRESH_PRESENTS );
1292                 } else {
1293                         int locked = 0;
1294                 /* It's RefreshAndPersist, transition to Persist phase */
1295                         syncprov_sendinfo( op, rs, rs->sr_nentries ?
1296                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
1297                                 &cookie, 1, NULL, 0 );
1298                         /* Flush any queued persist messages */
1299                         if ( ss->ss_so->s_res ) {
1300                                 syncres *sr, *srnext;
1301                                 Entry *e;
1302                                 opcookie opc;
1303
1304                                 opc.son = on;
1305                                 ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
1306                                 locked = 1;
1307                                 for (sr = ss->ss_so->s_res; sr; sr=srnext) {
1308                                         int rc = LDAP_SUCCESS;
1309                                         srnext = sr->s_next;
1310                                         opc.sdn = sr->s_dn;
1311                                         opc.sndn = sr->s_ndn;
1312                                         opc.suuid = sr->s_uuid;
1313                                         opc.sctxcsn = sr->s_csn;
1314                                         opc.sreference = sr->s_isreference;
1315                                         e = NULL;
1316
1317                                         if ( sr->s_mode != LDAP_SYNC_DELETE ) {
1318                                                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
1319                                                 rc = be_entry_get_rw( op, &opc.sndn, NULL, NULL, 0, &e );
1320                                                 op->o_bd->bd_info = (BackendInfo *)on;
1321                                         }
1322                                         if ( rc == LDAP_SUCCESS )
1323                                                 syncprov_sendresp( op, &opc, ss->ss_so, e,
1324                                                         sr->s_mode, 0 );
1325
1326                                         if ( e ) {
1327                                                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
1328                                                 be_entry_release_r( op, e );
1329                                                 op->o_bd->bd_info = (BackendInfo *)on;
1330                                         }
1331                                         ch_free( sr );
1332                                 }
1333                                 ss->ss_so->s_res = NULL;
1334                                 ss->ss_so->s_restail = NULL;
1335                         }
1336
1337                         /* Turn off the refreshing flag */
1338                         ss->ss_so->s_flags ^= PS_IS_REFRESHING;
1339                         if ( locked )
1340                                 ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
1341
1342                         /* Detach this Op from frontend control */
1343                         syncprov_detach_op( op, ss->ss_so );
1344
1345                         return LDAP_SUCCESS;
1346                 }
1347         }
1348
1349         return SLAP_CB_CONTINUE;
1350 }
1351
1352 static int
1353 syncprov_op_search( Operation *op, SlapReply *rs )
1354 {
1355         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1356         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
1357         slap_callback   *cb;
1358         int gotstate = 0, nochange = 0;
1359         Filter *fand, *fava;
1360         syncops *sop = NULL;
1361         searchstate *ss;
1362         sync_control *srs;
1363
1364         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
1365
1366         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
1367                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
1368                 return rs->sr_err;
1369         }
1370
1371         srs = op->o_controls[slap_cids.sc_LDAPsync];
1372
1373         /* If this is a persistent search, set it up right away */
1374         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
1375                 syncops so = {0};
1376                 fbase_cookie fc;
1377                 opcookie opc;
1378                 slap_callback sc;
1379
1380                 fc.fss = &so;
1381                 fc.fbase = 0;
1382                 so.s_eid = NOID;
1383                 so.s_op = op;
1384                 so.s_flags = PS_IS_REFRESHING;
1385                 /* syncprov_findbase expects to be called as a callback... */
1386                 sc.sc_private = &opc;
1387                 opc.son = on;
1388                 cb = op->o_callback;
1389                 op->o_callback = &sc;
1390                 rs->sr_err = syncprov_findbase( op, &fc );
1391                 op->o_callback = cb;
1392
1393                 if ( rs->sr_err != LDAP_SUCCESS ) {
1394                         send_ldap_result( op, rs );
1395                         return rs->sr_err;
1396                 }
1397                 sop = ch_malloc( sizeof( syncops ));
1398                 *sop = so;
1399                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
1400                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1401                 sop->s_sid = srs->sr_state.sid;
1402                 sop->s_rid = srs->sr_state.rid;
1403                 sop->s_next = si->si_ops;
1404                 sop->s_inuse = 1;
1405                 si->si_ops = sop;
1406                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1407         }
1408
1409         /* If we have a cookie, handle the PRESENT lookups
1410          */
1411         if ( srs->sr_state.ctxcsn ) {
1412                 /* Is the CSN in a valid format? */
1413                 if ( srs->sr_state.ctxcsn->bv_len >= LDAP_LUTIL_CSNSTR_BUFSIZE ) {
1414                         send_ldap_error( op, rs, LDAP_OTHER, "invalid sync cookie" );
1415                         return rs->sr_err;
1416                 }
1417                 /* Is the CSN still present in the database? */
1418                 if ( syncprov_findcsn( op, FIND_CSN ) != LDAP_SUCCESS ) {
1419                         /* No, so a reload is required */
1420 #if 0           /* the consumer doesn't seem to send this hint */
1421                         if ( op->o_sync_rhint == 0 ) {
1422                                 send_ldap_error( op, rs, LDAP_SYNC_REFRESH_REQUIRED, "sync cookie is stale" );
1423                                 return rs->sr_err;
1424                         }
1425 #endif
1426                 } else {
1427                         gotstate = 1;
1428                         /* If just Refreshing and nothing has changed, shortcut it */
1429                         if ( bvmatch( srs->sr_state.ctxcsn, &si->si_ctxcsn )) {
1430                                 nochange = 1;
1431                                 if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
1432                                         LDAPControl     *ctrls[2];
1433
1434                                         ctrls[0] = NULL;
1435                                         ctrls[1] = NULL;
1436                                         syncprov_done_ctrl( op, rs, ctrls, 0, 0,
1437                                                 NULL, LDAP_SYNC_REFRESH_DELETES );
1438                                         rs->sr_ctrls = ctrls;
1439                                         rs->sr_err = LDAP_SUCCESS;
1440                                         send_ldap_result( op, rs );
1441                                         rs->sr_ctrls = NULL;
1442                                         return rs->sr_err;
1443                                 }
1444                                 goto shortcut;
1445                         } else
1446                         /* If context has changed, check for Present UUIDs */
1447                         if ( syncprov_findcsn( op, FIND_PRESENT ) != LDAP_SUCCESS ) {
1448                                 send_ldap_result( op, rs );
1449                                 return rs->sr_err;
1450                         }
1451                 }
1452         }
1453
1454         /* Append CSN range to search filter, save original filter
1455          * for persistent search evaluation
1456          */
1457         if ( sop ) {
1458                 sop->s_filterstr= op->ors_filterstr;
1459         }
1460
1461         fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
1462         fand->f_choice = LDAP_FILTER_AND;
1463         fand->f_next = NULL;
1464         fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
1465         fava->f_choice = LDAP_FILTER_LE;
1466         fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
1467         fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
1468         ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1469         ber_dupbv_x( &fava->f_ava->aa_value, &si->si_ctxcsn, op->o_tmpmemctx );
1470         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1471         fand->f_and = fava;
1472         if ( gotstate ) {
1473                 fava->f_next = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
1474                 fava = fava->f_next;
1475                 fava->f_choice = LDAP_FILTER_GE;
1476                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
1477                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
1478                 ber_dupbv_x( &fava->f_ava->aa_value, srs->sr_state.ctxcsn, op->o_tmpmemctx );
1479         }
1480         fava->f_next = op->ors_filter;
1481         op->ors_filter = fand;
1482         filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
1483
1484 shortcut:
1485         /* Let our callback add needed info to returned entries */
1486         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
1487         ss = (searchstate *)(cb+1);
1488         ss->ss_on = on;
1489         ss->ss_so = sop;
1490         cb->sc_response = syncprov_search_response;
1491         cb->sc_cleanup = syncprov_search_cleanup;
1492         cb->sc_private = ss;
1493         cb->sc_next = op->o_callback;
1494         op->o_callback = cb;
1495
1496 #if 0   /* I don't think we need to shortcircuit back-bdb any more */
1497         op->o_sync_mode &= SLAP_CONTROL_MASK;
1498 #endif
1499
1500         /* If this is a persistent search and no changes were reported during
1501          * the refresh phase, just invoke the response callback to transition
1502          * us into persist phase
1503          */
1504         if ( nochange ) {
1505                 rs->sr_err = LDAP_SUCCESS;
1506                 rs->sr_nentries = 0;
1507                 send_ldap_result( op, rs );
1508                 return rs->sr_err;
1509         }
1510         return SLAP_CB_CONTINUE;
1511 }
1512
1513 static int
1514 syncprov_operational(
1515         Operation *op,
1516         SlapReply *rs )
1517 {
1518         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1519         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
1520
1521         if ( rs->sr_entry &&
1522                 dn_match( &rs->sr_entry->e_nname, op->o_bd->be_nsuffix )) {
1523
1524                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
1525                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
1526                         Attribute *a, **ap = NULL;
1527
1528
1529                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
1530                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
1531                                         break;
1532                         }
1533
1534                         if ( !a ) {
1535                                 for ( ap = &rs->sr_operational_attrs; *ap; ap=&(*ap)->a_next );
1536
1537                                 a = ch_malloc( sizeof(Attribute));
1538                                 a->a_desc = slap_schema.si_ad_contextCSN;
1539                                 a->a_vals = ch_malloc( 2 * sizeof(struct berval));
1540                                 a->a_vals[1].bv_val = NULL;
1541                                 a->a_nvals = a->a_vals;
1542                                 a->a_next = NULL;
1543                                 a->a_flags = 0;
1544                                 *ap = a;
1545                         }
1546
1547                         ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1548                         if ( !ap ) {
1549                                 strcpy( a->a_vals[0].bv_val, si->si_ctxcsnbuf );
1550                         } else {
1551                                 ber_dupbv( &a->a_vals[0], &si->si_ctxcsn );
1552                         }
1553                         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1554                 }
1555         }
1556         return LDAP_SUCCESS;
1557 }
1558
1559 static int
1560 syncprov_db_config(
1561         BackendDB       *be,
1562         const char      *fname,
1563         int             lineno,
1564         int             argc,
1565         char    **argv
1566 )
1567 {
1568         slap_overinst           *on = (slap_overinst *)be->bd_info;
1569         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
1570
1571 #if 0
1572         if ( strcasecmp( argv[ 0 ], "syncprov-checkpoint" ) == 0 ) {
1573                 if ( argc != 3 ) {
1574                         fprintf( stderr, "%s: line %d: wrong number of arguments in "
1575                                 "\"syncprov-checkpoint <ops> <minutes>\"\n", fname, lineno );
1576                         return -1;
1577                 }
1578                 si->si_chkops = atoi( argv[1] );
1579                 si->si_chktime = atoi( argv[2] ) * 60;
1580
1581         } else {
1582                 return SLAP_CONF_UNKNOWN;
1583         }
1584 #endif
1585
1586         return SLAP_CONF_UNKNOWN;
1587 }
1588
1589 /* Cheating - we have no thread pool context for these functions,
1590  * so make one.
1591  */
1592 typedef struct thread_keys {
1593         void *key;
1594         void *data;
1595         ldap_pvt_thread_pool_keyfree_t *xfree;
1596 } thread_keys;
1597
1598 #define MAXKEYS 32
1599 /* A fake thread context */
1600 static thread_keys thrctx[MAXKEYS];
1601
1602 /* Read any existing contextCSN from the underlying db.
1603  * Then search for any entries newer than that. If no value exists,
1604  * just generate it. Cache whatever result.
1605  */
1606 static int
1607 syncprov_db_open(
1608     BackendDB *be
1609 )
1610 {
1611         slap_overinst   *on = (slap_overinst *) be->bd_info;
1612         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
1613
1614         char opbuf[OPERATION_BUFFER_SIZE];
1615         Operation *op = (Operation *)opbuf;
1616         Entry *e;
1617         Attribute *a;
1618         int rc;
1619
1620         memset(opbuf, 0, sizeof(opbuf));
1621         op->o_hdr = (Opheader *)(op+1);
1622         op->o_bd = be;
1623         op->o_dn = be->be_rootdn;
1624         op->o_ndn = be->be_rootndn;
1625         op->o_threadctx = thrctx;
1626         op->o_tmpmfuncs = &ch_mfuncs;
1627
1628         op->o_bd->bd_info = on->on_info->oi_orig;
1629         rc = be_entry_get_rw( op, be->be_nsuffix, NULL,
1630                 slap_schema.si_ad_contextCSN, 0, &e );
1631
1632         if ( e ) {
1633                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
1634                 if ( a ) {
1635                         si->si_ctxcsn.bv_len = a->a_nvals[0].bv_len;
1636                         if ( si->si_ctxcsn.bv_len >= sizeof(si->si_ctxcsnbuf ))
1637                                 si->si_ctxcsn.bv_len = sizeof(si->si_ctxcsnbuf)-1;
1638                         strncpy( si->si_ctxcsnbuf, a->a_nvals[0].bv_val,
1639                                 si->si_ctxcsn.bv_len );
1640                         si->si_ctxcsnbuf[si->si_ctxcsn.bv_len] = '\0';
1641                 }
1642                 be_entry_release_r( op, e );
1643         }
1644
1645         if ( BER_BVISEMPTY( &si->si_ctxcsn ) ) {
1646                 slap_get_csn( op, si->si_ctxcsnbuf, sizeof(si->si_ctxcsnbuf),
1647                                 &si->si_ctxcsn, 0 );
1648         }
1649
1650         op->o_bd->bd_info = (BackendInfo *)on;
1651         return 0;
1652 }
1653
1654 /* Write the current contextCSN into the underlying db.
1655  */
1656 static int
1657 syncprov_db_close(
1658     BackendDB *be
1659 )
1660 {
1661     slap_overinst   *on = (slap_overinst *) be->bd_info;
1662     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
1663         int i;
1664
1665         if ( si->si_numops ) {
1666                 Connection conn;
1667                 char opbuf[OPERATION_BUFFER_SIZE];
1668                 Operation *op = (Operation *)opbuf;
1669                 SlapReply rs = {REP_RESULT};
1670
1671                 connection_fake_init( &conn, op, thrctx );
1672                 op->o_bd = be;
1673                 op->o_dn = be->be_rootdn;
1674                 op->o_ndn = be->be_rootndn;
1675                 syncprov_checkpoint( op, &rs, on );
1676         }
1677         for ( i=0; thrctx[i].key; i++) {
1678                 if ( thrctx[i].xfree )
1679                         thrctx[i].xfree( thrctx[i].key, thrctx[i].data );
1680                 thrctx[i].key = NULL;
1681         }
1682
1683     return 0;
1684 }
1685
1686 static int
1687 syncprov_db_init(
1688         BackendDB *be
1689 )
1690 {
1691         slap_overinst   *on = (slap_overinst *)be->bd_info;
1692         syncprov_info_t *si;
1693
1694         si = ch_calloc(1, sizeof(syncprov_info_t));
1695         on->on_bi.bi_private = si;
1696         ldap_pvt_thread_mutex_init( &si->si_csn_mutex );
1697         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
1698         ldap_pvt_thread_rdwr_init( &si->si_mods_rwlock );
1699         si->si_ctxcsn.bv_val = si->si_ctxcsnbuf;
1700
1701         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
1702         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
1703
1704         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
1705         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
1706
1707         return 0;
1708 }
1709
1710 static int
1711 syncprov_db_destroy(
1712         BackendDB *be
1713 )
1714 {
1715         slap_overinst   *on = (slap_overinst *)be->bd_info;
1716         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
1717
1718         if ( si ) {
1719                 ldap_pvt_thread_rdwr_destroy( &si->si_mods_rwlock );
1720                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
1721                 ldap_pvt_thread_mutex_destroy( &si->si_csn_mutex );
1722                 ch_free( si );
1723         }
1724
1725         return 0;
1726 }
1727
1728 static int syncprov_parseCtrl (
1729         Operation *op,
1730         SlapReply *rs,
1731         LDAPControl *ctrl )
1732 {
1733         ber_tag_t tag;
1734         BerElement *ber;
1735         ber_int_t mode;
1736         ber_len_t len;
1737         struct berval cookie = BER_BVNULL;
1738         sync_control *sr;
1739         int rhint = 0;
1740
1741         if ( op->o_sync != SLAP_CONTROL_NONE ) {
1742                 rs->sr_text = "Sync control specified multiple times";
1743                 return LDAP_PROTOCOL_ERROR;
1744         }
1745
1746         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
1747                 rs->sr_text = "Sync control specified with pagedResults control";
1748                 return LDAP_PROTOCOL_ERROR;
1749         }
1750
1751         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
1752                 rs->sr_text = "Sync control value is empty (or absent)";
1753                 return LDAP_PROTOCOL_ERROR;
1754         }
1755
1756         /* Parse the control value
1757          *      syncRequestValue ::= SEQUENCE {
1758          *              mode   ENUMERATED {
1759          *                      -- 0 unused
1760          *                      refreshOnly             (1),
1761          *                      -- 2 reserved
1762          *                      refreshAndPersist       (3)
1763          *              },
1764          *              cookie  syncCookie OPTIONAL
1765          *      }
1766          */
1767
1768         ber = ber_init( &ctrl->ldctl_value );
1769         if( ber == NULL ) {
1770                 rs->sr_text = "internal error";
1771                 return LDAP_OTHER;
1772         }
1773
1774         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
1775                 rs->sr_text = "Sync control : mode decoding error";
1776                 return LDAP_PROTOCOL_ERROR;
1777         }
1778
1779         switch( mode ) {
1780         case LDAP_SYNC_REFRESH_ONLY:
1781                 mode = SLAP_SYNC_REFRESH;
1782                 break;
1783         case LDAP_SYNC_REFRESH_AND_PERSIST:
1784                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
1785                 break;
1786         default:
1787                 rs->sr_text = "Sync control : unknown update mode";
1788                 return LDAP_PROTOCOL_ERROR;
1789         }
1790
1791         tag = ber_peek_tag( ber, &len );
1792
1793         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
1794                 if (( ber_scanf( ber, /*{*/ "o", &cookie )) == LBER_ERROR ) {
1795                         rs->sr_text = "Sync control : cookie decoding error";
1796                         return LDAP_PROTOCOL_ERROR;
1797                 }
1798         }
1799         if ( tag == LDAP_TAG_RELOAD_HINT ) {
1800                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
1801                         rs->sr_text = "Sync control : rhint decoding error";
1802                         return LDAP_PROTOCOL_ERROR;
1803                 }
1804         }
1805         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
1806                         rs->sr_text = "Sync control : decoding error";
1807                         return LDAP_PROTOCOL_ERROR;
1808         }
1809         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
1810         sr->sr_rhint = rhint;
1811         if (!BER_BVISNULL(&cookie)) {
1812                 ber_bvarray_add( &sr->sr_state.octet_str, &cookie );
1813                 slap_parse_sync_cookie( &sr->sr_state );
1814         }
1815
1816         op->o_controls[slap_cids.sc_LDAPsync] = sr;
1817
1818         (void) ber_free( ber, 1 );
1819
1820         op->o_sync = ctrl->ldctl_iscritical
1821                 ? SLAP_CONTROL_CRITICAL
1822                 : SLAP_CONTROL_NONCRITICAL;
1823
1824         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
1825
1826         return LDAP_SUCCESS;
1827 }
1828
1829 /* This overlay is set up for dynamic loading via moduleload. For static
1830  * configuration, you'll need to arrange for the slap_overinst to be
1831  * initialized and registered by some other function inside slapd.
1832  */
1833
1834 static slap_overinst            syncprov;
1835
1836 int
1837 syncprov_init()
1838 {
1839         int rc;
1840
1841         rc = register_supported_control( LDAP_CONTROL_SYNC,
1842                 SLAP_CTRL_HIDE|SLAP_CTRL_SEARCH, NULL,
1843                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
1844         if ( rc != LDAP_SUCCESS ) {
1845                 fprintf( stderr, "Failed to register control %d\n", rc );
1846                 return rc;
1847         }
1848
1849         syncprov.on_bi.bi_type = "syncprov";
1850         syncprov.on_bi.bi_db_init = syncprov_db_init;
1851         syncprov.on_bi.bi_db_config = syncprov_db_config;
1852         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
1853         syncprov.on_bi.bi_db_open = syncprov_db_open;
1854         syncprov.on_bi.bi_db_close = syncprov_db_close;
1855
1856         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
1857         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
1858
1859         syncprov.on_bi.bi_op_add = syncprov_op_mod;
1860         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
1861         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
1862         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
1863         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
1864         syncprov.on_bi.bi_op_search = syncprov_op_search;
1865         syncprov.on_bi.bi_extended = syncprov_op_extended;
1866         syncprov.on_bi.bi_operational = syncprov_operational;
1867
1868 #if 0
1869         syncprov.on_response = syncprov_response;
1870 #endif
1871
1872         return overlay_register( &syncprov );
1873 }
1874
1875 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
1876 int
1877 init_module( int argc, char *argv[] )
1878 {
1879         return syncprov_init();
1880 }
1881 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
1882
1883 #endif /* defined(SLAPD_OVER_SYNCPROV) */