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

   1 /* $OpenLDAP$ */
   2 /* syncprov.c - syncrepl provider */
   3 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   4  *
   5  * Copyright 2004-2005 The OpenLDAP Foundation.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted only as authorized by the OpenLDAP
  10  * Public License.
  11  *
  12  * A copy of this license is available in the file LICENSE in the
  13  * top-level directory of the distribution or, alternatively, at
  14  * <http://www.OpenLDAP.org/license.html>.
  15  */
  16 /* ACKNOWLEDGEMENTS:
  17  * This work was initially developed by Howard Chu for inclusion in
  18  * OpenLDAP Software.
  19  */
  20
  21 #include "portable.h"
  22
  23 #ifdef SLAPD_OVER_SYNCPROV
  24
  25 #include <ac/string.h>
  26 #include "lutil.h"
  27 #include "slap.h"
  28 #include "config.h"
  29 #include "ldap_rq.h"
  30
  31 /* A modify request on a particular entry */
  32 typedef struct modinst {
  33         struct modinst *mi_next;
  34         Operation *mi_op;
  35 } modinst;
  36
  37 typedef struct modtarget {
  38         struct modinst *mt_mods;
  39         struct modinst *mt_tail;
  40         Operation *mt_op;
  41         ldap_pvt_thread_mutex_t mt_mutex;
  42 } modtarget;
  43
  44 /* A queued result of a persistent search */
  45 typedef struct syncres {
  46         struct syncres *s_next;
  47         struct berval s_dn;
  48         struct berval s_ndn;
  49         struct berval s_uuid;
  50         struct berval s_csn;
  51         char s_mode;
  52         char s_isreference;
  53 } syncres;
  54
  55 /* Record of a persistent search */
  56 typedef struct syncops {
  57         struct syncops *s_next;
  58         struct berval   s_base;         /* ndn of search base */
  59         ID              s_eid;          /* entryID of search base */
  60         Operation       *s_op;          /* search op */
  61         int             s_rid;
  62         struct berval s_filterstr;
  63         int             s_flags;        /* search status */
  64 #define PS_IS_REFRESHING        0x01
  65 #define PS_IS_DETACHED          0x02
  66 #define PS_WROTE_BASE           0x04
  67 #define PS_FIND_BASE            0x08
  68
  69         int             s_inuse;        /* reference count */
  70         struct syncres *s_res;
  71         struct syncres *s_restail;
  72         struct re_s     *s_qtask;       /* task for playing psearch responses */
  73         ldap_pvt_thread_mutex_t s_mutex;
  74 } syncops;
  75
  76 /* A received sync control */
  77 typedef struct sync_control {
  78         struct sync_cookie sr_state;
  79         int sr_rhint;
  80 } sync_control;
  81
  82 #if 0 /* moved back to slap.h */
  83 #define o_sync  o_ctrlflag[slap_cids.sc_LDAPsync]
  84 #endif
  85 /* o_sync_mode uses data bits of o_sync */
  86 #define o_sync_mode     o_ctrlflag[slap_cids.sc_LDAPsync]
  87
  88 #define SLAP_SYNC_NONE                                  (LDAP_SYNC_NONE<<SLAP_CONTROL_SHIFT)
  89 #define SLAP_SYNC_REFRESH                               (LDAP_SYNC_REFRESH_ONLY<<SLAP_CONTROL_SHIFT)
  90 #define SLAP_SYNC_PERSIST                               (LDAP_SYNC_RESERVED<<SLAP_CONTROL_SHIFT)
  91 #define SLAP_SYNC_REFRESH_AND_PERSIST   (LDAP_SYNC_REFRESH_AND_PERSIST<<SLAP_CONTROL_SHIFT)
  92
  93 /* Record of which searches matched at premodify step */
  94 typedef struct syncmatches {
  95         struct syncmatches *sm_next;
  96         syncops *sm_op;
  97 } syncmatches;
  98
  99 /* Session log data */
 100 typedef struct slog_entry {
 101         struct slog_entry *se_next;
 102         struct berval se_uuid;
 103         struct berval se_csn;
 104         ber_tag_t       se_tag;
 105 } slog_entry;
 106
 107 typedef struct sessionlog {
 108         struct berval   sl_mincsn;
 109         int             sl_num;
 110         int             sl_size;
 111         slog_entry *sl_head;
 112         slog_entry *sl_tail;
 113         ldap_pvt_thread_mutex_t sl_mutex;
 114 } sessionlog;
 115
 116 /* The main state for this overlay */
 117 typedef struct syncprov_info_t {
 118         syncops         *si_ops;
 119         struct berval   si_ctxcsn;      /* ldapsync context */
 120         int             si_chkops;      /* checkpointing info */
 121         int             si_chktime;
 122         int             si_numops;      /* number of ops since last checkpoint */
 123         int             si_nopres;      /* Skip present phase */
 124         time_t  si_chklast;     /* time of last checkpoint */
 125         Avlnode *si_mods;       /* entries being modified */
 126         sessionlog      *si_logs;
 127         ldap_pvt_thread_mutex_t si_csn_mutex;
 128         ldap_pvt_thread_mutex_t si_ops_mutex;
 129         ldap_pvt_thread_mutex_t si_mods_mutex;
 130         char            si_ctxcsnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 131 } syncprov_info_t;
 132
 133 typedef struct opcookie {
 134         slap_overinst *son;
 135         syncmatches *smatches;
 136         struct berval sdn;      /* DN of entry, for deletes */
 137         struct berval sndn;
 138         struct berval suuid;    /* UUID of entry */
 139         struct berval sctxcsn;
 140         int sreference; /* Is the entry a reference? */
 141 } opcookie;
 142
 143 typedef struct fbase_cookie {
 144         struct berval *fdn;     /* DN of a modified entry, for scope testing */
 145         syncops *fss;   /* persistent search we're testing against */
 146         int fbase;      /* if TRUE we found the search base and it's still valid */
 147         int fscope;     /* if TRUE then fdn is within the psearch scope */
 148 } fbase_cookie;
 149
 150 static AttributeName csn_anlist[3];
 151 static AttributeName uuid_anlist[2];
 152
 153 /* Build a LDAPsync intermediate state control */
 154 static int
 155 syncprov_state_ctrl(
 156         Operation       *op,
 157         SlapReply       *rs,
 158         Entry           *e,
 159         int             entry_sync_state,
 160         LDAPControl     **ctrls,
 161         int             num_ctrls,
 162         int             send_cookie,
 163         struct berval   *cookie )
 164 {
 165         Attribute* a;
 166         int ret;
 167
 168         BerElementBuffer berbuf;
 169         BerElement *ber = (BerElement *)&berbuf;
 170
 171         struct berval   entryuuid_bv = BER_BVNULL;
 172
 173         ber_init2( ber, 0, LBER_USE_DER );
 174         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 175
 176         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 177
 178         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 179                 AttributeDescription *desc = a->a_desc;
 180                 if ( desc == slap_schema.si_ad_entryUUID ) {
 181                         entryuuid_bv = a->a_nvals[0];
 182                         break;
 183                 }
 184         }
 185
 186         /* FIXME: what if entryuuid is NULL or empty ? */
 187
 188         if ( send_cookie && cookie ) {
 189                 ber_printf( ber, "{eOON}",
 190                         entry_sync_state, &entryuuid_bv, cookie );
 191         } else {
 192                 ber_printf( ber, "{eON}",
 193                         entry_sync_state, &entryuuid_bv );
 194         }
 195
 196         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 197         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 198         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 199
 200         ber_free_buf( ber );
 201
 202         if ( ret < 0 ) {
 203                 Debug( LDAP_DEBUG_TRACE,
 204                         "slap_build_sync_ctrl: ber_flatten2 failed\n",
 205                         0, 0, 0 );
 206                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 207                 return ret;
 208         }
 209
 210         return LDAP_SUCCESS;
 211 }
 212
 213 /* Build a LDAPsync final state control */
 214 static int
 215 syncprov_done_ctrl(
 216         Operation       *op,
 217         SlapReply       *rs,
 218         LDAPControl     **ctrls,
 219         int                     num_ctrls,
 220         int                     send_cookie,
 221         struct berval *cookie,
 222         int                     refreshDeletes )
 223 {
 224         int ret;
 225         BerElementBuffer berbuf;
 226         BerElement *ber = (BerElement *)&berbuf;
 227
 228         ber_init2( ber, NULL, LBER_USE_DER );
 229         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 230
 231         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 232
 233         ber_printf( ber, "{" );
 234         if ( send_cookie && cookie ) {
 235                 ber_printf( ber, "O", cookie );
 236         }
 237         if ( refreshDeletes == LDAP_SYNC_REFRESH_DELETES ) {
 238                 ber_printf( ber, "b", refreshDeletes );
 239         }
 240         ber_printf( ber, "N}" );
 241
 242         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_DONE;
 243         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 244         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 245
 246         ber_free_buf( ber );
 247
 248         if ( ret < 0 ) {
 249                 Debug( LDAP_DEBUG_TRACE,
 250                         "syncprov_done_ctrl: ber_flatten2 failed\n",
 251                         0, 0, 0 );
 252                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 253                 return ret;
 254         }
 255
 256         return LDAP_SUCCESS;
 257 }
 258
 259 static int
 260 syncprov_sendinfo(
 261         Operation       *op,
 262         SlapReply       *rs,
 263         int                     type,
 264         struct berval *cookie,
 265         int                     refreshDone,
 266         BerVarray       syncUUIDs,
 267         int                     refreshDeletes )
 268 {
 269         BerElementBuffer berbuf;
 270         BerElement *ber = (BerElement *)&berbuf;
 271         struct berval rspdata;
 272
 273         int ret;
 274
 275         ber_init2( ber, NULL, LBER_USE_DER );
 276         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 277
 278         if ( type ) {
 279                 switch ( type ) {
 280                 case LDAP_TAG_SYNC_NEW_COOKIE:
 281                         ber_printf( ber, "tO", type, cookie );
 282                         break;
 283                 case LDAP_TAG_SYNC_REFRESH_DELETE:
 284                 case LDAP_TAG_SYNC_REFRESH_PRESENT:
 285                         ber_printf( ber, "t{", type );
 286                         if ( cookie ) {
 287                                 ber_printf( ber, "O", cookie );
 288                         }
 289                         if ( refreshDone == 0 ) {
 290                                 ber_printf( ber, "b", refreshDone );
 291                         }
 292                         ber_printf( ber, "N}" );
 293                         break;
 294                 case LDAP_TAG_SYNC_ID_SET:
 295                         ber_printf( ber, "t{", type );
 296                         if ( cookie ) {
 297                                 ber_printf( ber, "O", cookie );
 298                         }
 299                         if ( refreshDeletes == 1 ) {
 300                                 ber_printf( ber, "b", refreshDeletes );
 301                         }
 302                         ber_printf( ber, "[W]", syncUUIDs );
 303                         ber_printf( ber, "N}" );
 304                         break;
 305                 default:
 306                         Debug( LDAP_DEBUG_TRACE,
 307                                 "syncprov_sendinfo: invalid syncinfo type (%d)\n",
 308                                 type, 0, 0 );
 309                         return LDAP_OTHER;
 310                 }
 311         }
 312
 313         ret = ber_flatten2( ber, &rspdata, 0 );
 314
 315         if ( ret < 0 ) {
 316                 Debug( LDAP_DEBUG_TRACE,
 317                         "syncprov_sendinfo: ber_flatten2 failed\n",
 318                         0, 0, 0 );
 319                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 320                 return ret;
 321         }
 322
 323         rs->sr_rspoid = LDAP_SYNC_INFO;
 324         rs->sr_rspdata = &rspdata;
 325         send_ldap_intermediate( op, rs );
 326         rs->sr_rspdata = NULL;
 327         ber_free_buf( ber );
 328
 329         return LDAP_SUCCESS;
 330 }
 331
 332 /* Find a modtarget in an AVL tree */
 333 static int
 334 sp_avl_cmp( const void *c1, const void *c2 )
 335 {
 336         const modtarget *m1, *m2;
 337         int rc;
 338
 339         m1 = c1; m2 = c2;
 340         rc = m1->mt_op->o_req_ndn.bv_len - m2->mt_op->o_req_ndn.bv_len;
 341
 342         if ( rc ) return rc;
 343         return ber_bvcmp( &m1->mt_op->o_req_ndn, &m2->mt_op->o_req_ndn );
 344 }
 345
 346 /* syncprov_findbase:
 347  *   finds the true DN of the base of a search (with alias dereferencing) and
 348  * checks to make sure the base entry doesn't get replaced with a different
 349  * entry (e.g., swapping trees via ModDN, or retargeting an alias). If a
 350  * change is detected, any persistent search on this base must be terminated /
 351  * reloaded.
 352  *   On the first call, we just save the DN and entryID. On subsequent calls
 353  * we compare the DN and entryID with the saved values.
 354  */
 355 static int
 356 findbase_cb( Operation *op, SlapReply *rs )
 357 {
 358         slap_callback *sc = op->o_callback;
 359
 360         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 361                 fbase_cookie *fc = sc->sc_private;
 362
 363                 /* If no entryID, we're looking for the first time.
 364                  * Just store whatever we got.
 365                  */
 366                 if ( fc->fss->s_eid == NOID ) {
 367                         fc->fbase = 2;
 368                         fc->fss->s_eid = rs->sr_entry->e_id;
 369                         ber_dupbv( &fc->fss->s_base, &rs->sr_entry->e_nname );
 370
 371                 } else if ( rs->sr_entry->e_id == fc->fss->s_eid &&
 372                         dn_match( &rs->sr_entry->e_nname, &fc->fss->s_base )) {
 373
 374                 /* OK, the DN is the same and the entryID is the same. */
 375                         fc->fbase = 1;
 376                 }
 377         }
 378         if ( rs->sr_err != LDAP_SUCCESS ) {
 379                 Debug( LDAP_DEBUG_ANY, "findbase failed! %d\n", rs->sr_err,0,0 );
 380         }
 381         return LDAP_SUCCESS;
 382 }
 383
 384 static int
 385 syncprov_findbase( Operation *op, fbase_cookie *fc )
 386 {
 387         opcookie *opc = op->o_callback->sc_private;
 388         slap_overinst *on = opc->son;
 389
 390         /* Use basic parameters from syncrepl search, but use
 391          * current op's threadctx / tmpmemctx
 392          */
 393         ldap_pvt_thread_mutex_lock( &fc->fss->s_mutex );
 394         if ( fc->fss->s_flags & PS_FIND_BASE ) {
 395                 slap_callback cb = {0};
 396                 Operation fop;
 397                 SlapReply frs = { REP_RESULT };
 398                 int rc;
 399
 400                 fc->fss->s_flags ^= PS_FIND_BASE;
 401                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 402
 403                 fop = *fc->fss->s_op;
 404
 405                 fop.o_hdr = op->o_hdr;
 406                 fop.o_bd = op->o_bd;
 407                 fop.o_time = op->o_time;
 408                 fop.o_tincr = op->o_tincr;
 409
 410                 cb.sc_response = findbase_cb;
 411                 cb.sc_private = fc;
 412
 413                 fop.o_sync_mode = 0;    /* turn off sync mode */
 414                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 415                 fop.o_callback = &cb;
 416                 fop.o_tag = LDAP_REQ_SEARCH;
 417                 fop.ors_scope = LDAP_SCOPE_BASE;
 418                 fop.ors_limit = NULL;
 419                 fop.ors_slimit = 1;
 420                 fop.ors_tlimit = SLAP_NO_LIMIT;
 421                 fop.ors_attrs = slap_anlist_no_attrs;
 422                 fop.ors_attrsonly = 1;
 423
 424                 fop.o_bd->bd_info = on->on_info->oi_orig;
 425                 rc = fop.o_bd->be_search( &fop, &frs );
 426                 fop.o_bd->bd_info = (BackendInfo *)on;
 427         } else {
 428                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 429                 fc->fbase = 1;
 430         }
 431
 432         /* After the first call, see if the fdn resides in the scope */
 433         if ( fc->fbase == 1 ) {
 434                 switch ( fc->fss->s_op->ors_scope ) {
 435                 case LDAP_SCOPE_BASE:
 436                         fc->fscope = dn_match( fc->fdn, &fc->fss->s_base );
 437                         break;
 438                 case LDAP_SCOPE_ONELEVEL: {
 439                         struct berval pdn;
 440                         dnParent( fc->fdn, &pdn );
 441                         fc->fscope = dn_match( &pdn, &fc->fss->s_base );
 442                         break; }
 443                 case LDAP_SCOPE_SUBTREE:
 444                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base );
 445                         break;
 446 #ifdef LDAP_SCOPE_SUBORDINATE
 447                 case LDAP_SCOPE_SUBORDINATE:
 448                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base ) &&
 449                                 !dn_match( fc->fdn, &fc->fss->s_base );
 450                         break;
 451 #endif
 452                 }
 453         }
 454
 455         if ( fc->fbase )
 456                 return LDAP_SUCCESS;
 457
 458         /* If entryID has changed, then the base of this search has
 459          * changed. Invalidate the psearch.
 460          */
 461         return LDAP_NO_SUCH_OBJECT;
 462 }
 463
 464 /* syncprov_findcsn:
 465  *   This function has three different purposes, but they all use a search
 466  * that filters on entryCSN so they're combined here.
 467  * 1: at startup time, after a contextCSN has been read from the database,
 468  * we search for all entries with CSN >= contextCSN in case the contextCSN
 469  * was not checkpointed at the previous shutdown.
 470  *
 471  * 2: when the current contextCSN is known and we have a sync cookie, we search
 472  * for one entry with CSN = the cookie CSN. If not found, try <= cookie CSN.
 473  * If an entry is found, the cookie CSN is valid, otherwise it is stale.
 474  *
 475  * 3: during a refresh phase, we search for all entries with CSN <= the cookie
 476  * CSN, and generate Present records for them. We always collect this result
 477  * in SyncID sets, even if there's only one match.
 478  */
 479 #define FIND_MAXCSN     1
 480 #define FIND_CSN        2
 481 #define FIND_PRESENT    3
 482
 483 static int
 484 findmax_cb( Operation *op, SlapReply *rs )
 485 {
 486         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 487                 struct berval *maxcsn = op->o_callback->sc_private;
 488                 Attribute *a = attr_find( rs->sr_entry->e_attrs,
 489                         slap_schema.si_ad_entryCSN );
 490
 491                 if ( a && ber_bvcmp( &a->a_vals[0], maxcsn ) > 0 ) {
 492                         maxcsn->bv_len = a->a_vals[0].bv_len;
 493                         strcpy( maxcsn->bv_val, a->a_vals[0].bv_val );
 494                 }
 495         }
 496         return LDAP_SUCCESS;
 497 }
 498
 499 static int
 500 findcsn_cb( Operation *op, SlapReply *rs )
 501 {
 502         slap_callback *sc = op->o_callback;
 503
 504         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 505                 sc->sc_private = (void *)1;
 506         }
 507         return LDAP_SUCCESS;
 508 }
 509
 510 /* Build a list of entryUUIDs for sending in a SyncID set */
 511
 512 #define UUID_LEN        16
 513
 514 typedef struct fpres_cookie {
 515         int num;
 516         BerVarray uuids;
 517         char *last;
 518 } fpres_cookie;
 519
 520 static int
 521 findpres_cb( Operation *op, SlapReply *rs )
 522 {
 523         slap_callback *sc = op->o_callback;
 524         fpres_cookie *pc = sc->sc_private;
 525         Attribute *a;
 526         int ret = SLAP_CB_CONTINUE;
 527
 528         switch ( rs->sr_type ) {
 529         case REP_SEARCH:
 530                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryUUID );
 531                 if ( a ) {
 532                         pc->uuids[pc->num].bv_val = pc->last;
 533                         AC_MEMCPY( pc->uuids[pc->num].bv_val, a->a_nvals[0].bv_val,
 534                                 pc->uuids[pc->num].bv_len );
 535                         pc->num++;
 536                         pc->last = pc->uuids[pc->num].bv_val;
 537                         pc->uuids[pc->num].bv_val = NULL;
 538                 }
 539                 ret = LDAP_SUCCESS;
 540                 if ( pc->num != SLAP_SYNCUUID_SET_SIZE )
 541                         break;
 542                 /* FALLTHRU */
 543         case REP_RESULT:
 544                 ret = rs->sr_err;
 545                 if ( pc->num ) {
 546                         ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 547                                 0, pc->uuids, 0 );
 548                         pc->uuids[pc->num].bv_val = pc->last;
 549                         pc->num = 0;
 550                         pc->last = pc->uuids[0].bv_val;
 551                 }
 552                 break;
 553         default:
 554                 break;
 555         }
 556         return ret;
 557 }
 558
 559 static int
 560 syncprov_findcsn( Operation *op, int mode )
 561 {
 562         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 563         syncprov_info_t         *si = on->on_bi.bi_private;
 564
 565         slap_callback cb = {0};
 566         Operation fop;
 567         SlapReply frs = { REP_RESULT };
 568         char buf[LDAP_LUTIL_CSNSTR_BUFSIZE + STRLENOF("(entryCSN<=)")];
 569         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 570         struct berval maxcsn;
 571         Filter cf, af;
 572 #ifdef LDAP_COMP_MATCH
 573         AttributeAssertion eq = { NULL, BER_BVNULL, NULL };
 574 #else
 575         AttributeAssertion eq = { NULL, BER_BVNULL };
 576 #endif
 577         int i, rc = LDAP_SUCCESS;
 578         fpres_cookie pcookie;
 579         sync_control *srs = NULL;
 580         int findcsn_retry = 1;
 581
 582         if ( mode != FIND_MAXCSN ) {
 583                 srs = op->o_controls[slap_cids.sc_LDAPsync];
 584
 585                 if ( srs->sr_state.ctxcsn.bv_len >= LDAP_LUTIL_CSNSTR_BUFSIZE ) {
 586                         return LDAP_OTHER;
 587                 }
 588         }
 589
 590         fop = *op;
 591         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync_mode */
 592         /* We want pure entries, not referrals */
 593         fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 594
 595         cf.f_ava = &eq;
 596         cf.f_av_desc = slap_schema.si_ad_entryCSN;
 597         cf.f_next = NULL;
 598
 599         fop.o_callback = &cb;
 600         fop.ors_limit = NULL;
 601         fop.ors_tlimit = SLAP_NO_LIMIT;
 602         fop.ors_filter = &cf;
 603         fop.ors_filterstr.bv_val = buf;
 604
 605 again:
 606         switch( mode ) {
 607         case FIND_MAXCSN:
 608                 cf.f_choice = LDAP_FILTER_GE;
 609                 cf.f_av_value = si->si_ctxcsn;
 610                 fop.ors_filterstr.bv_len = sprintf( buf, "(entryCSN>=%s)",
 611                         cf.f_av_value.bv_val );
 612                 fop.ors_attrsonly = 0;
 613                 fop.ors_attrs = csn_anlist;
 614                 fop.ors_slimit = SLAP_NO_LIMIT;
 615                 cb.sc_private = &maxcsn;
 616                 cb.sc_response = findmax_cb;
 617                 strcpy( cbuf, si->si_ctxcsn.bv_val );
 618                 maxcsn.bv_val = cbuf;
 619                 maxcsn.bv_len = si->si_ctxcsn.bv_len;
 620                 break;
 621         case FIND_CSN:
 622                 cf.f_av_value = srs->sr_state.ctxcsn;
 623                 /* Look for exact match the first time */
 624                 if ( findcsn_retry ) {
 625                         cf.f_choice = LDAP_FILTER_EQUALITY;
 626                         fop.ors_filterstr.bv_len = sprintf( buf, "(entryCSN=%s)",
 627                                 cf.f_av_value.bv_val );
 628                 /* On retry, look for <= */
 629                 } else {
 630                         cf.f_choice = LDAP_FILTER_LE;
 631                         fop.ors_filterstr.bv_len = sprintf( buf, "(entryCSN<=%s)",
 632                                 cf.f_av_value.bv_val );
 633                 }
 634                 fop.ors_attrsonly = 1;
 635                 fop.ors_attrs = slap_anlist_no_attrs;
 636                 fop.ors_slimit = 1;
 637                 cb.sc_private = NULL;
 638                 cb.sc_response = findcsn_cb;
 639                 break;
 640         case FIND_PRESENT:
 641                 af.f_choice = LDAP_FILTER_AND;
 642                 af.f_next = NULL;
 643                 af.f_and = &cf;
 644                 cf.f_choice = LDAP_FILTER_LE;
 645                 cf.f_av_value = srs->sr_state.ctxcsn;
 646                 cf.f_next = op->ors_filter;
 647                 fop.ors_filter = &af;
 648                 filter2bv_x( &fop, fop.ors_filter, &fop.ors_filterstr );
 649                 fop.ors_attrsonly = 0;
 650                 fop.ors_attrs = uuid_anlist;
 651                 fop.ors_slimit = SLAP_NO_LIMIT;
 652                 cb.sc_private = &pcookie;
 653                 cb.sc_response = findpres_cb;
 654                 pcookie.num = 0;
 655
 656                 /* preallocate storage for a full set */
 657                 pcookie.uuids = op->o_tmpalloc( (SLAP_SYNCUUID_SET_SIZE+1) *
 658                         sizeof(struct berval) + SLAP_SYNCUUID_SET_SIZE * UUID_LEN,
 659                         op->o_tmpmemctx );
 660                 pcookie.last = (char *)(pcookie.uuids + SLAP_SYNCUUID_SET_SIZE+1);
 661                 pcookie.uuids[0].bv_val = pcookie.last;
 662                 pcookie.uuids[0].bv_len = UUID_LEN;
 663                 for (i=1; i<SLAP_SYNCUUID_SET_SIZE; i++) {
 664                         pcookie.uuids[i].bv_val = pcookie.uuids[i-1].bv_val + UUID_LEN;
 665                         pcookie.uuids[i].bv_len = UUID_LEN;
 666                 }
 667                 break;
 668         }
 669
 670         fop.o_bd->bd_info = on->on_info->oi_orig;
 671         fop.o_bd->be_search( &fop, &frs );
 672         fop.o_bd->bd_info = (BackendInfo *)on;
 673
 674         switch( mode ) {
 675         case FIND_MAXCSN:
 676                 strcpy( si->si_ctxcsnbuf, maxcsn.bv_val );
 677                 si->si_ctxcsn.bv_len = maxcsn.bv_len;
 678                 break;
 679         case FIND_CSN:
 680                 /* If matching CSN was not found, invalidate the context. */
 681                 if ( !cb.sc_private ) {
 682                         /* If we didn't find an exact match, then try for <= */
 683                         if ( findcsn_retry ) {
 684                                 findcsn_retry = 0;
 685                                 goto again;
 686                         }
 687                         rc = LDAP_NO_SUCH_OBJECT;
 688                 }
 689                 break;
 690         case FIND_PRESENT:
 691                 op->o_tmpfree( pcookie.uuids, op->o_tmpmemctx );
 692                 op->o_tmpfree( fop.ors_filterstr.bv_val, op->o_tmpmemctx );
 693                 break;
 694         }
 695
 696         return rc;
 697 }
 698
 699 /* Send a persistent search response */
 700 static int
 701 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so, Entry **e, int mode)
 702 {
 703         slap_overinst *on = opc->son;
 704
 705         SlapReply rs = { REP_SEARCH };
 706         LDAPControl *ctrls[2];
 707         struct berval cookie;
 708         Entry e_uuid = {0};
 709         Attribute a_uuid = {0};
 710
 711         if ( so->s_op->o_abandon )
 712                 return SLAPD_ABANDON;
 713
 714         ctrls[1] = NULL;
 715         slap_compose_sync_cookie( op, &cookie, &opc->sctxcsn, so->s_rid );
 716
 717         e_uuid.e_attrs = &a_uuid;
 718         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 719         a_uuid.a_nvals = &opc->suuid;
 720         rs.sr_err = syncprov_state_ctrl( op, &rs, &e_uuid,
 721                 mode, ctrls, 0, 1, &cookie );
 722
 723         rs.sr_ctrls = ctrls;
 724         op->o_bd->bd_info = (BackendInfo *)on->on_info;
 725         switch( mode ) {
 726         case LDAP_SYNC_ADD:
 727                 rs.sr_entry = *e;
 728                 if ( rs.sr_entry->e_private )
 729                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 730                 if ( opc->sreference ) {
 731                         rs.sr_ref = get_entry_referrals( op, rs.sr_entry );
 732                         send_search_reference( op, &rs );
 733                         ber_bvarray_free( rs.sr_ref );
 734                         if ( !rs.sr_entry )
 735                                 *e = NULL;
 736                         break;
 737                 }
 738                 /* fallthru */
 739         case LDAP_SYNC_MODIFY:
 740                 rs.sr_entry = *e;
 741                 if ( rs.sr_entry->e_private )
 742                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 743                 rs.sr_attrs = op->ors_attrs;
 744                 send_search_entry( op, &rs );
 745                 if ( !rs.sr_entry )
 746                         *e = NULL;
 747                 break;
 748         case LDAP_SYNC_DELETE:
 749                 e_uuid.e_attrs = NULL;
 750                 e_uuid.e_name = opc->sdn;
 751                 e_uuid.e_nname = opc->sndn;
 752                 rs.sr_entry = &e_uuid;
 753                 if ( opc->sreference ) {
 754                         struct berval bv = BER_BVNULL;
 755                         rs.sr_ref = &bv;
 756                         send_search_reference( op, &rs );
 757                 } else {
 758                         send_search_entry( op, &rs );
 759                 }
 760                 break;
 761         default:
 762                 assert(0);
 763         }
 764         op->o_tmpfree( rs.sr_ctrls[0], op->o_tmpmemctx );
 765         rs.sr_ctrls = NULL;
 766
 767         return rs.sr_err;
 768 }
 769
 770 /* Play back queued responses */
 771 static int
 772 syncprov_qplay( Operation *op, slap_overinst *on, syncops *so )
 773 {
 774         syncres *sr;
 775         Entry *e;
 776         opcookie opc;
 777         int rc;
 778
 779         opc.son = on;
 780         op->o_bd->bd_info = (BackendInfo *)on->on_info;
 781
 782         for (;;) {
 783                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 784                 sr = so->s_res;
 785                 if ( sr )
 786                         so->s_res = sr->s_next;
 787                 if ( !so->s_res )
 788                         so->s_restail = NULL;
 789                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 790
 791                 if ( !sr )
 792                         break;
 793
 794                 if ( !so->s_op->o_abandon ) {
 795                         opc.sdn = sr->s_dn;
 796                         opc.sndn = sr->s_ndn;
 797                         opc.suuid = sr->s_uuid;
 798                         opc.sctxcsn = sr->s_csn;
 799                         opc.sreference = sr->s_isreference;
 800                         e = NULL;
 801
 802                         if ( sr->s_mode != LDAP_SYNC_DELETE ) {
 803                                 rc = be_entry_get_rw( op, &opc.sndn, NULL, NULL, 0, &e );
 804                                 if ( rc ) {
 805                                         ch_free( sr );
 806                                         continue;
 807                                 }
 808                         }
 809                         rc = syncprov_sendresp( op, &opc, so, &e, sr->s_mode );
 810
 811                         if ( e ) {
 812                                 be_entry_release_rw( op, e, 0 );
 813                         }
 814                         if ( rc )
 815                                 break;
 816                 }
 817
 818                 ch_free( sr );
 819         }
 820         op->o_bd->bd_info = (BackendInfo *)on;
 821         return rc;
 822 }
 823
 824 /* runqueue task for playing back queued responses */
 825 static void *
 826 syncprov_qtask( void *ctx, void *arg )
 827 {
 828         struct re_s *rtask = arg;
 829         syncops *so = rtask->arg;
 830         slap_overinst *on = so->s_op->o_private;
 831         char opbuf[OPERATION_BUFFER_SIZE];
 832         Operation *op;
 833         BackendDB be;
 834
 835         op = (Operation *)opbuf;
 836         memset( op, 0, sizeof(opbuf));
 837         op->o_hdr = (Opheader *)(op+1);
 838         op->o_controls = (void **)(op->o_hdr+1);
 839
 840         *op->o_hdr = *so->s_op->o_hdr;
 841
 842         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx);
 843         op->o_tmpmfuncs = &slap_sl_mfuncs;
 844         op->o_threadctx = ctx;
 845
 846         /* syncprov_qplay expects a fake db */
 847         be = *so->s_op->o_bd;
 848         be.be_flags |= SLAP_DBFLAG_OVERLAY;
 849         op->o_bd = &be;
 850         op->o_private = NULL;
 851         op->o_callback = NULL;
 852
 853         syncprov_qplay( op, on, so );
 854
 855         /* wait until we get explicitly scheduled again */
 856         ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
 857         ldap_pvt_runqueue_stoptask( &slapd_rq, so->s_qtask );
 858         ldap_pvt_runqueue_resched( &slapd_rq, so->s_qtask, 1 );
 859         ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
 860
 861         return NULL;
 862 }
 863
 864 /* Queue a persistent search response */
 865 static int
 866 syncprov_qresp( opcookie *opc, syncops *so, int mode )
 867 {
 868         syncres *sr;
 869
 870         sr = ch_malloc(sizeof(syncres) + opc->suuid.bv_len + 1 +
 871                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1 + opc->sctxcsn.bv_len + 1 );
 872         sr->s_next = NULL;
 873         sr->s_dn.bv_val = (char *)(sr + 1);
 874         sr->s_dn.bv_len = opc->sdn.bv_len;
 875         sr->s_mode = mode;
 876         sr->s_isreference = opc->sreference;
 877         sr->s_ndn.bv_val = lutil_strcopy( sr->s_dn.bv_val, opc->sdn.bv_val );
 878         sr->s_ndn.bv_len = opc->sndn.bv_len;
 879         *(sr->s_ndn.bv_val++) = '\0';
 880         sr->s_uuid.bv_val = lutil_strcopy( sr->s_ndn.bv_val, opc->sndn.bv_val );
 881         sr->s_uuid.bv_len = opc->suuid.bv_len;
 882         *(sr->s_uuid.bv_val++) = '\0';
 883         sr->s_csn.bv_val = lutil_strcopy( sr->s_uuid.bv_val, opc->suuid.bv_val );
 884         sr->s_csn.bv_len = opc->sctxcsn.bv_len;
 885         strcpy( sr->s_csn.bv_val, opc->sctxcsn.bv_val );
 886
 887         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 888         if ( !so->s_res ) {
 889                 so->s_res = sr;
 890         } else {
 891                 so->s_restail->s_next = sr;
 892         }
 893         so->s_restail = sr;
 894
 895         /* If the base of the psearch was modified, check it next time round */
 896         if ( so->s_flags & PS_WROTE_BASE ) {
 897                 so->s_flags ^= PS_WROTE_BASE;
 898                 so->s_flags |= PS_FIND_BASE;
 899         }
 900         if ( so->s_flags & PS_IS_DETACHED ) {
 901                 ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
 902                 if ( !so->s_qtask ) {
 903                         so->s_qtask = ldap_pvt_runqueue_insert( &slapd_rq, 1,
 904                                 syncprov_qtask, so, "syncprov_qtask",
 905                                 so->s_op->o_conn->c_peer_name.bv_val );
 906                 } else {
 907                         if (!ldap_pvt_runqueue_isrunning( &slapd_rq, so->s_qtask )) {
 908                                 so->s_qtask->interval.tv_sec = 0;
 909                                 ldap_pvt_runqueue_resched( &slapd_rq, so->s_qtask, 0 );
 910                                 so->s_qtask->interval.tv_sec = 1;
 911                         }
 912                 }
 913                 ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
 914         }
 915         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 916         return LDAP_SUCCESS;
 917 }
 918
 919 static void
 920 syncprov_free_syncop( syncops *so )
 921 {
 922         syncres *sr, *srnext;
 923         GroupAssertion *ga, *gnext;
 924
 925         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 926         so->s_inuse--;
 927         if ( so->s_inuse > 0 ) {
 928                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 929                 return;
 930         }
 931         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 932         if ( so->s_flags & PS_IS_DETACHED ) {
 933                 filter_free( so->s_op->ors_filter );
 934                 for ( ga = so->s_op->o_groups; ga; ga=gnext ) {
 935                         gnext = ga->ga_next;
 936                         ch_free( ga );
 937                 }
 938                 ch_free( so->s_op );
 939         }
 940         ch_free( so->s_base.bv_val );
 941         for ( sr=so->s_res; sr; sr=srnext ) {
 942                 srnext = sr->s_next;
 943                 ch_free( sr );
 944         }
 945         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 946         ch_free( so );
 947 }
 948
 949 static int
 950 syncprov_drop_psearch( syncops *so, int lock )
 951 {
 952         if ( so->s_flags & PS_IS_DETACHED ) {
 953                 if ( lock )
 954                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
 955                 so->s_op->o_conn->c_n_ops_executing--;
 956                 so->s_op->o_conn->c_n_ops_completed++;
 957                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, slap_op,
 958                         o_next );
 959                 if ( lock )
 960                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
 961         }
 962         syncprov_free_syncop( so );
 963
 964         return 0;
 965 }
 966
 967 static int
 968 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
 969 {
 970         slap_callback *sc = op->o_callback;
 971         op->o_callback = sc->sc_next;
 972         syncprov_drop_psearch( op->o_callback->sc_private, 0 );
 973         op->o_tmpfree( sc, op->o_tmpmemctx );
 974         return 0;
 975 }
 976
 977 static int
 978 syncprov_op_abandon( Operation *op, SlapReply *rs )
 979 {
 980         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 981         syncprov_info_t         *si = on->on_bi.bi_private;
 982         syncops *so, *soprev;
 983
 984         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
 985         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
 986                 soprev=so, so=so->s_next ) {
 987                 if ( so->s_op->o_connid == op->o_connid &&
 988                         so->s_op->o_msgid == op->orn_msgid ) {
 989                                 so->s_op->o_abandon = 1;
 990                                 soprev->s_next = so->s_next;
 991                                 break;
 992                 }
 993         }
 994         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
 995         if ( so ) {
 996                 /* Is this really a Cancel exop? */
 997                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
 998                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
 999                         rs->sr_err = LDAP_CANCELLED;
1000                         send_ldap_result( so->s_op, rs );
1001                         if ( so->s_flags & PS_IS_DETACHED ) {
1002                                 slap_callback *cb;
1003                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
1004                                 cb->sc_cleanup = syncprov_ab_cleanup;
1005                                 cb->sc_next = op->o_callback;
1006                                 cb->sc_private = so;
1007                                 return SLAP_CB_CONTINUE;
1008                         }
1009                 }
1010                 syncprov_drop_psearch( so, 0 );
1011         }
1012         return SLAP_CB_CONTINUE;
1013 }
1014
1015 /* Find which persistent searches are affected by this operation */
1016 static void
1017 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
1018 {
1019         slap_overinst *on = opc->son;
1020         syncprov_info_t         *si = on->on_bi.bi_private;
1021
1022         fbase_cookie fc;
1023         syncops *ss, *sprev, *snext;
1024         Entry *e;
1025         Attribute *a;
1026         int rc;
1027         struct berval newdn;
1028         int freefdn = 0;
1029
1030         fc.fdn = &op->o_req_ndn;
1031         /* compute new DN */
1032         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1033                 struct berval pdn;
1034                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
1035                 else dnParent( fc.fdn, &pdn );
1036                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
1037                 fc.fdn = &newdn;
1038                 freefdn = 1;
1039         }
1040         if ( op->o_tag != LDAP_REQ_ADD ) {
1041                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
1042                 rc = be_entry_get_rw( op, fc.fdn, NULL, NULL, 0, &e );
1043                 /* If we're sending responses now, make a copy and unlock the DB */
1044                 if ( e && !saveit ) {
1045                         Entry *e2 = entry_dup( e );
1046                         be_entry_release_rw( op, e, 0 );
1047                         e = e2;
1048                 }
1049                 op->o_bd->bd_info = (BackendInfo *)on;
1050                 if ( rc ) return;
1051         } else {
1052                 e = op->ora_e;
1053         }
1054
1055         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1056                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1057                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1058                 opc->sreference = is_entry_referral( e );
1059                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1060                 if ( a )
1061                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1062         } else if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1063                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1064                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1065                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1066                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1067         }
1068
1069         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1070         for (ss = si->si_ops, sprev = (syncops *)&si->si_ops; ss;
1071                 sprev = ss, ss=snext)
1072         {
1073                 syncmatches *sm;
1074                 int found = 0;
1075
1076                 snext = ss->s_next;
1077                 /* validate base */
1078                 fc.fss = ss;
1079                 fc.fbase = 0;
1080                 fc.fscope = 0;
1081
1082                 /* If the base of the search is missing, signal a refresh */
1083                 rc = syncprov_findbase( op, &fc );
1084                 if ( rc != LDAP_SUCCESS ) {
1085                         SlapReply rs = {REP_RESULT};
1086                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1087                                 "search base has changed" );
1088                         sprev->s_next = snext;
1089                         syncprov_drop_psearch( ss, 1 );
1090                         ss = sprev;
1091                         continue;
1092                 }
1093
1094
1095                 /* If we're sending results now, look for this op in old matches */
1096                 if ( !saveit ) {
1097                         syncmatches *old;
1098
1099                         /* Did we modify the search base? */
1100                         if ( dn_match( &op->o_req_ndn, &ss->s_base )) {
1101                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1102                                 ss->s_flags |= PS_WROTE_BASE;
1103                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1104                         }
1105
1106                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1107                                 old=sm, sm=sm->sm_next ) {
1108                                 if ( sm->sm_op == ss ) {
1109                                         found = 1;
1110                                         old->sm_next = sm->sm_next;
1111                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1112                                         break;
1113                                 }
1114                         }
1115                 }
1116
1117                 /* check if current o_req_dn is in scope and matches filter */
1118                 if ( fc.fscope && test_filter( op, e, ss->s_op->ors_filter ) ==
1119                         LDAP_COMPARE_TRUE ) {
1120                         if ( saveit ) {
1121                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1122                                 sm->sm_next = opc->smatches;
1123                                 sm->sm_op = ss;
1124                                 ss->s_inuse++;
1125                                 opc->smatches = sm;
1126                         } else {
1127                                 /* if found send UPDATE else send ADD */
1128                                 ss->s_inuse++;
1129                                 syncprov_qresp( opc, ss,
1130                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD );
1131                                 ss->s_inuse--;
1132                         }
1133                 } else if ( !saveit && found ) {
1134                         /* send DELETE */
1135                         syncprov_qresp( opc, ss, LDAP_SYNC_DELETE );
1136                 }
1137         }
1138         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1139
1140         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1141                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
1142                 be_entry_release_rw( op, e, 0 );
1143                 op->o_bd->bd_info = (BackendInfo *)on;
1144         }
1145         if ( freefdn ) {
1146                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1147         }
1148 }
1149
1150 static int
1151 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1152 {
1153         slap_callback *cb = op->o_callback;
1154         opcookie *opc = cb->sc_private;
1155         slap_overinst *on = opc->son;
1156         syncprov_info_t         *si = on->on_bi.bi_private;
1157         syncmatches *sm, *snext;
1158         modtarget *mt, mtdummy;
1159
1160         for (sm = opc->smatches; sm; sm=snext) {
1161                 snext = sm->sm_next;
1162                 syncprov_free_syncop( sm->sm_op );
1163                 op->o_tmpfree( sm, op->o_tmpmemctx );
1164         }
1165
1166         /* Remove op from lock table */
1167         mtdummy.mt_op = op;
1168         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1169         mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1170         if ( mt ) {
1171                 modinst *mi = mt->mt_mods;
1172
1173                 /* If there are more, promote the next one */
1174                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1175                 if ( mi->mi_next ) {
1176                         mt->mt_mods = mi->mi_next;
1177                         mt->mt_op = mt->mt_mods->mi_op;
1178                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1179                 } else {
1180                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1181                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1182                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1183                         ch_free( mt );
1184                 }
1185         }
1186         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1187         if ( !BER_BVISNULL( &opc->suuid ))
1188                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1189         if ( !BER_BVISNULL( &opc->sndn ))
1190                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1191         if ( !BER_BVISNULL( &opc->sdn ))
1192                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1193         op->o_callback = cb->sc_next;
1194         op->o_tmpfree(cb, op->o_tmpmemctx);
1195
1196         return 0;
1197 }
1198
1199 static void
1200 syncprov_checkpoint( Operation *op, SlapReply *rs, slap_overinst *on )
1201 {
1202         syncprov_info_t         *si = on->on_bi.bi_private;
1203         Modifications mod;
1204         Operation opm;
1205         struct berval bv[2];
1206         slap_callback cb = {0};
1207         int manage = get_manageDSAit(op);
1208
1209         mod.sml_values = bv;
1210         bv[1].bv_val = NULL;
1211         bv[0] = si->si_ctxcsn;
1212         mod.sml_nvalues = NULL;
1213         mod.sml_desc = slap_schema.si_ad_contextCSN;
1214         mod.sml_op = LDAP_MOD_REPLACE;
1215         mod.sml_flags = 0;
1216         mod.sml_next = NULL;
1217
1218         cb.sc_response = slap_null_cb;
1219         opm = *op;
1220         opm.o_tag = LDAP_REQ_MODIFY;
1221         opm.o_callback = &cb;
1222         opm.orm_modlist = &mod;
1223         opm.o_req_dn = op->o_bd->be_suffix[0];
1224         opm.o_req_ndn = op->o_bd->be_nsuffix[0];
1225         opm.o_bd->bd_info = on->on_info->oi_orig;
1226         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1227         opm.o_bd->be_modify( &opm, rs );
1228         opm.o_managedsait = manage;
1229 }
1230
1231 static void
1232 syncprov_add_slog( Operation *op, struct berval *csn )
1233 {
1234         opcookie *opc = op->o_callback->sc_private;
1235         slap_overinst *on = opc->son;
1236         syncprov_info_t         *si = on->on_bi.bi_private;
1237         sessionlog *sl;
1238         slog_entry *se;
1239
1240         sl = si->si_logs;
1241         {
1242                 /* Allocate a record. UUIDs are not NUL-terminated. */
1243                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1244                         csn->bv_len + 1 );
1245                 se->se_next = NULL;
1246                 se->se_tag = op->o_tag;
1247
1248                 se->se_uuid.bv_val = (char *)(se+1);
1249                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1250                 se->se_uuid.bv_len = opc->suuid.bv_len;
1251
1252                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1253                 AC_MEMCPY( se->se_csn.bv_val, csn->bv_val, csn->bv_len );
1254                 se->se_csn.bv_val[csn->bv_len] = '\0';
1255                 se->se_csn.bv_len = csn->bv_len;
1256
1257                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1258                 if ( sl->sl_head ) {
1259                         sl->sl_tail->se_next = se;
1260                 } else {
1261                         sl->sl_head = se;
1262                 }
1263                 sl->sl_tail = se;
1264                 sl->sl_num++;
1265                 while ( sl->sl_num > sl->sl_size ) {
1266                         se = sl->sl_head;
1267                         sl->sl_head = se->se_next;
1268                         strcpy( sl->sl_mincsn.bv_val, se->se_csn.bv_val );
1269                         sl->sl_mincsn.bv_len = se->se_csn.bv_len;
1270                         ch_free( se );
1271                         sl->sl_num--;
1272                         if ( !sl->sl_head ) {
1273                                 sl->sl_tail = NULL;
1274                         }
1275                 }
1276                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1277         }
1278 }
1279
1280 /* Just set a flag if we found the matching entry */
1281 static int
1282 playlog_cb( Operation *op, SlapReply *rs )
1283 {
1284         if ( rs->sr_type == REP_SEARCH ) {
1285                 op->o_callback->sc_private = (void *)1;
1286         }
1287         return rs->sr_err;
1288 }
1289
1290 /* enter with sl->sl_mutex locked, release before returning */
1291 static void
1292 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1293         struct berval *oldcsn, struct berval *ctxcsn )
1294 {
1295         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1296         slog_entry *se;
1297         int i, j, ndel, num, nmods, mmods;
1298         BerVarray uuids;
1299
1300         if ( !sl->sl_num ) {
1301                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1302                 return;
1303         }
1304
1305         num = sl->sl_num;
1306         i = 0;
1307         nmods = 0;
1308
1309         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1310                 num * UUID_LEN, op->o_tmpmemctx );
1311
1312         uuids[0].bv_val = (char *)(uuids + num + 1);
1313
1314         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1315          * and everything else at the end. Do this first so we can
1316          * unlock the list mutex.
1317          */
1318         for ( se=sl->sl_head; se; se=se->se_next ) {
1319                 if ( ber_bvcmp( &se->se_csn, oldcsn ) < 0 ) continue;
1320                 if ( ber_bvcmp( &se->se_csn, ctxcsn ) > 0 ) break;
1321                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1322                         j = i;
1323                         i++;
1324                 } else {
1325                         nmods++;
1326                         j = num - nmods;
1327                 }
1328                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1329                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1330                 uuids[j].bv_len = UUID_LEN;
1331         }
1332         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1333
1334         ndel = i;
1335
1336         /* Zero out unused slots */
1337         for ( i=ndel; i < num - nmods; i++ )
1338                 uuids[i].bv_len = 0;
1339
1340         /* Mods must be validated to see if they belong in this delete set.
1341          */
1342
1343         mmods = nmods;
1344         /* Strip any duplicates */
1345         for ( i=0; i<nmods; i++ ) {
1346                 for ( j=0; j<ndel; j++ ) {
1347                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1348                                 uuids[num - 1 - i].bv_len = 0;
1349                                 mmods --;
1350                                 break;
1351                         }
1352                 }
1353                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1354                 for ( j=0; j<i; j++ ) {
1355                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1356                                 uuids[num - 1 - i].bv_len = 0;
1357                                 mmods --;
1358                                 break;
1359                         }
1360                 }
1361         }
1362
1363         if ( mmods ) {
1364                 Operation fop;
1365                 SlapReply frs = { REP_RESULT };
1366                 int rc;
1367                 Filter mf, af;
1368 #ifdef LDAP_COMP_MATCH
1369                 AttributeAssertion eq = { NULL, BER_BVNULL, NULL };
1370 #else
1371                 AttributeAssertion eq;
1372 #endif
1373                 slap_callback cb = {0};
1374
1375                 fop = *op;
1376
1377                 fop.o_sync_mode = 0;
1378                 fop.o_callback = &cb;
1379                 fop.ors_limit = NULL;
1380                 fop.ors_tlimit = SLAP_NO_LIMIT;
1381                 fop.ors_attrs = slap_anlist_all_attributes;
1382                 fop.ors_attrsonly = 0;
1383                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1384
1385                 af.f_choice = LDAP_FILTER_AND;
1386                 af.f_next = NULL;
1387                 af.f_and = &mf;
1388                 mf.f_choice = LDAP_FILTER_EQUALITY;
1389                 mf.f_ava = &eq;
1390                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1391                 mf.f_next = fop.ors_filter;
1392
1393                 fop.ors_filter = &af;
1394
1395                 cb.sc_response = playlog_cb;
1396                 fop.o_bd->bd_info = on->on_info->oi_orig;
1397
1398                 for ( i=ndel; i<num; i++ ) {
1399                         if ( uuids[i].bv_len == 0 ) continue;
1400
1401                         mf.f_av_value = uuids[i];
1402                         cb.sc_private = NULL;
1403                         fop.ors_slimit = 1;
1404                         rc = fop.o_bd->be_search( &fop, &frs );
1405
1406                         /* If entry was not found, add to delete list */
1407                         if ( !cb.sc_private ) {
1408                                 uuids[ndel++] = uuids[i];
1409                         }
1410                 }
1411                 fop.o_bd->bd_info = (BackendInfo *)on;
1412         }
1413         if ( ndel ) {
1414                 uuids[ndel].bv_val = NULL;
1415                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL, 0, uuids, 1 );
1416         }
1417 }
1418
1419 static int
1420 syncprov_op_response( Operation *op, SlapReply *rs )
1421 {
1422         opcookie *opc = op->o_callback->sc_private;
1423         slap_overinst *on = opc->son;
1424         syncprov_info_t         *si = on->on_bi.bi_private;
1425         syncmatches *sm;
1426
1427         if ( rs->sr_err == LDAP_SUCCESS )
1428         {
1429                 struct berval maxcsn = BER_BVNULL, curcsn = BER_BVNULL;
1430                 char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1431
1432                 /* Update our context CSN */
1433                 cbuf[0] = '\0';
1434                 ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1435                 slap_get_commit_csn( op, &maxcsn, &curcsn );
1436                 if ( !BER_BVISNULL( &maxcsn ) ) {
1437                         strcpy( cbuf, maxcsn.bv_val );
1438                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn ) > 0 ) {
1439                                 strcpy( si->si_ctxcsnbuf, cbuf );
1440                                 si->si_ctxcsn.bv_len = maxcsn.bv_len;
1441                         }
1442                 }
1443
1444                 /* Don't do any processing for consumer contextCSN updates */
1445                 if ( SLAP_SYNC_SHADOW( op->o_bd ) &&
1446                         op->o_msgid == SLAP_SYNC_UPDATE_MSGID ) {
1447                         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1448                         return SLAP_CB_CONTINUE;
1449                 }
1450
1451                 si->si_numops++;
1452                 if ( si->si_chkops || si->si_chktime ) {
1453                         int do_check=0;
1454                         if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1455                                 do_check = 1;
1456                                 si->si_numops = 0;
1457                         }
1458                         if ( si->si_chktime &&
1459                                 (op->o_time - si->si_chklast >= si->si_chktime )) {
1460                                 do_check = 1;
1461                                 si->si_chklast = op->o_time;
1462                         }
1463                         if ( do_check ) {
1464                                 syncprov_checkpoint( op, rs, on );
1465                         }
1466                 }
1467                 ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1468
1469                 opc->sctxcsn.bv_len = maxcsn.bv_len;
1470                 opc->sctxcsn.bv_val = cbuf;
1471
1472                 /* Handle any persistent searches */
1473                 if ( si->si_ops ) {
1474                         switch(op->o_tag) {
1475                         case LDAP_REQ_ADD:
1476                         case LDAP_REQ_MODIFY:
1477                         case LDAP_REQ_MODRDN:
1478                         case LDAP_REQ_EXTENDED:
1479                                 syncprov_matchops( op, opc, 0 );
1480                                 break;
1481                         case LDAP_REQ_DELETE:
1482                                 /* for each match in opc->smatches:
1483                                  *   send DELETE msg
1484                                  */
1485                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1486                                         if ( sm->sm_op->s_op->o_abandon )
1487                                                 continue;
1488                                         syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_DELETE );
1489                                 }
1490                                 break;
1491                         }
1492                 }
1493
1494                 /* Add any log records */
1495                 if ( si->si_logs && op->o_tag != LDAP_REQ_ADD ) {
1496                         syncprov_add_slog( op, &curcsn );
1497                 }
1498
1499         }
1500         return SLAP_CB_CONTINUE;
1501 }
1502
1503 /* We don't use a subentry to store the context CSN any more.
1504  * We expose the current context CSN as an operational attribute
1505  * of the suffix entry.
1506  */
1507 static int
1508 syncprov_op_compare( Operation *op, SlapReply *rs )
1509 {
1510         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1511         syncprov_info_t         *si = on->on_bi.bi_private;
1512         int rc = SLAP_CB_CONTINUE;
1513
1514         if ( dn_match( &op->o_req_ndn, op->o_bd->be_nsuffix ) &&
1515                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1516         {
1517                 Entry e = {0};
1518                 Attribute a = {0};
1519                 struct berval bv[2];
1520
1521                 e.e_name = op->o_bd->be_suffix[0];
1522                 e.e_nname = op->o_bd->be_nsuffix[0];
1523
1524                 BER_BVZERO( &bv[1] );
1525                 bv[0] = si->si_ctxcsn;
1526
1527                 a.a_desc = slap_schema.si_ad_contextCSN;
1528                 a.a_vals = bv;
1529                 a.a_nvals = a.a_vals;
1530
1531                 ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1532
1533                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1534                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1535                 if ( ! rs->sr_err ) {
1536                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1537                         goto return_results;
1538                 }
1539
1540                 if ( get_assert( op ) &&
1541                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
1542                 {
1543                         rs->sr_err = LDAP_ASSERTION_FAILED;
1544                         goto return_results;
1545                 }
1546
1547
1548                 rs->sr_err = LDAP_COMPARE_FALSE;
1549
1550                 if ( value_find_ex( op->oq_compare.rs_ava->aa_desc,
1551                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
1552                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
1553                                 a.a_nvals, &op->oq_compare.rs_ava->aa_value, op->o_tmpmemctx ) == 0 )
1554                 {
1555                         rs->sr_err = LDAP_COMPARE_TRUE;
1556                 }
1557
1558 return_results:;
1559
1560                 ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1561
1562                 send_ldap_result( op, rs );
1563
1564                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
1565                         rs->sr_err = LDAP_SUCCESS;
1566                 }
1567                 rc = rs->sr_err;
1568         }
1569
1570         return rc;
1571 }
1572
1573 static int
1574 syncprov_op_mod( Operation *op, SlapReply *rs )
1575 {
1576         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1577         syncprov_info_t         *si = on->on_bi.bi_private;
1578
1579         slap_callback *cb = op->o_tmpcalloc(1, sizeof(slap_callback)+
1580                 sizeof(opcookie) +
1581                 (si->si_ops ? sizeof(modinst) : 0 ),
1582                 op->o_tmpmemctx);
1583         opcookie *opc = (opcookie *)(cb+1);
1584         opc->son = on;
1585         cb->sc_response = syncprov_op_response;
1586         cb->sc_cleanup = syncprov_op_cleanup;
1587         cb->sc_private = opc;
1588         cb->sc_next = op->o_callback;
1589         op->o_callback = cb;
1590
1591         /* If there are active persistent searches, lock this operation.
1592          * See seqmod.c for the locking logic on its own.
1593          */
1594         if ( si->si_ops ) {
1595                 modtarget *mt, mtdummy;
1596                 modinst *mi;
1597
1598                 mi = (modinst *)(opc+1);
1599                 mi->mi_op = op;
1600
1601                 /* See if we're already modifying this entry... */
1602                 mtdummy.mt_op = op;
1603                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1604                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1605                 if ( mt ) {
1606                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1607                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1608                         mt->mt_tail->mi_next = mi;
1609                         mt->mt_tail = mi;
1610                         /* wait for this op to get to head of list */
1611                         while ( mt->mt_mods != mi ) {
1612                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1613                                 ldap_pvt_thread_yield();
1614                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1615
1616                                 /* clean up if the caller is giving up */
1617                                 if ( op->o_abandon ) {
1618                                         modinst *m2;
1619                                         for ( m2 = mt->mt_mods; m2->mi_next != mi;
1620                                                 m2 = m2->mi_next );
1621                                         m2->mi_next = mi->mi_next;
1622                                         if ( mt->mt_tail == mi ) mt->mt_tail = m2;
1623                                         op->o_tmpfree( cb, op->o_tmpmemctx );
1624                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1625                                         return SLAPD_ABANDON;
1626                                 }
1627                         }
1628                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1629                 } else {
1630                         /* Record that we're modifying this entry now */
1631                         mt = ch_malloc( sizeof(modtarget) );
1632                         mt->mt_mods = mi;
1633                         mt->mt_tail = mi;
1634                         mt->mt_op = mi->mi_op;
1635                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
1636                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
1637                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1638                 }
1639         }
1640
1641         if (( si->si_ops || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
1642                 syncprov_matchops( op, opc, 1 );
1643
1644         return SLAP_CB_CONTINUE;
1645 }
1646
1647 static int
1648 syncprov_op_extended( Operation *op, SlapReply *rs )
1649 {
1650         if ( exop_is_write( op ))
1651                 return syncprov_op_mod( op, rs );
1652
1653         return SLAP_CB_CONTINUE;
1654 }
1655
1656 typedef struct searchstate {
1657         slap_overinst *ss_on;
1658         syncops *ss_so;
1659         int ss_present;
1660         struct berval ss_ctxcsn;
1661         char ss_csnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1662 } searchstate;
1663
1664 static int
1665 syncprov_search_cleanup( Operation *op, SlapReply *rs )
1666 {
1667         if ( rs->sr_ctrls ) {
1668                 op->o_tmpfree( rs->sr_ctrls[0], op->o_tmpmemctx );
1669                 op->o_tmpfree( rs->sr_ctrls, op->o_tmpmemctx );
1670                 rs->sr_ctrls = NULL;
1671         }
1672         return 0;
1673 }
1674
1675 static void
1676 syncprov_detach_op( Operation *op, syncops *so, slap_overinst *on )
1677 {
1678         Operation *op2;
1679         int i, alen = 0;
1680         size_t size;
1681         char *ptr;
1682         GroupAssertion *g1, *g2;
1683
1684         /* count the search attrs */
1685         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1686                 alen += op->ors_attrs[i].an_name.bv_len + 1;
1687         }
1688         /* Make a new copy of the operation */
1689         size = sizeof(Operation) + sizeof(Opheader) +
1690                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
1691                 op->o_req_dn.bv_len + 1 +
1692                 op->o_req_ndn.bv_len + 1 +
1693                 op->o_ndn.bv_len + 1 +
1694                 so->s_filterstr.bv_len + 1;
1695         op2 = (Operation *)ch_calloc( 1, size );
1696         op2->o_hdr = (Opheader *)(op2+1);
1697
1698         /* Copy the fields we care about explicitly, leave the rest alone */
1699         *op2->o_hdr = *op->o_hdr;
1700         op2->o_tag = op->o_tag;
1701         op2->o_time = op->o_time;
1702         op2->o_bd = on->on_info->oi_origdb;
1703         op2->o_request = op->o_request;
1704         op2->o_private = on;
1705
1706         if ( i ) {
1707                 op2->ors_attrs = (AttributeName *)(op2->o_hdr + 1);
1708                 ptr = (char *)(op2->ors_attrs+i+1);
1709                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1710                         op2->ors_attrs[i] = op->ors_attrs[i];
1711                         op2->ors_attrs[i].an_name.bv_val = ptr;
1712                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
1713                 }
1714                 BER_BVZERO( &op2->ors_attrs[i].an_name );
1715         } else {
1716                 ptr = (char *)(op2->o_hdr + 1);
1717         }
1718         op2->o_authz = op->o_authz;
1719         op2->o_ndn.bv_val = ptr;
1720         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
1721         op2->o_dn = op2->o_ndn;
1722         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
1723         op2->o_req_dn.bv_val = ptr;
1724         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
1725         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
1726         op2->o_req_ndn.bv_val = ptr;
1727         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
1728         op2->ors_filterstr.bv_val = ptr;
1729         strcpy( ptr, so->s_filterstr.bv_val );
1730         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
1731         op2->ors_filter = str2filter( ptr );
1732         so->s_op = op2;
1733
1734         /* Copy any cached group ACLs individually */
1735         op2->o_groups = NULL;
1736         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
1737                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
1738                 *g2 = *g1;
1739                 strcpy( g2->ga_ndn, g1->ga_ndn );
1740                 g2->ga_next = op2->o_groups;
1741                 op2->o_groups = g2;
1742         }
1743         /* Don't allow any further group caching */
1744         op2->o_do_not_cache = 1;
1745
1746         /* Add op2 to conn so abandon will find us */
1747         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
1748         op->o_conn->c_n_ops_executing++;
1749         op->o_conn->c_n_ops_completed--;
1750         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
1751         so->s_flags |= PS_IS_DETACHED;
1752         ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
1753 }
1754
1755 static int
1756 syncprov_search_response( Operation *op, SlapReply *rs )
1757 {
1758         searchstate *ss = op->o_callback->sc_private;
1759         slap_overinst *on = ss->ss_on;
1760         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
1761
1762         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
1763                 Attribute *a;
1764                 /* If we got a referral without a referral object, there's
1765                  * something missing that we cannot replicate. Just ignore it.
1766                  * The consumer will abort because we didn't send the expected
1767                  * control.
1768                  */
1769                 if ( !rs->sr_entry ) {
1770                         assert( rs->sr_entry != NULL );
1771                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
1772                         return SLAP_CB_CONTINUE;
1773                 }
1774                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryCSN );
1775                 if ( a ) {
1776                         /* Make sure entry is less than the snaphot'd contextCSN */
1777                         if ( ber_bvcmp( &a->a_nvals[0], &ss->ss_ctxcsn ) > 0 )
1778                                 return LDAP_SUCCESS;
1779
1780                         /* Don't send the ctx entry twice */
1781                         if ( !BER_BVISNULL( &srs->sr_state.ctxcsn ) &&
1782                                 bvmatch( &a->a_nvals[0], &srs->sr_state.ctxcsn ) )
1783                                 return LDAP_SUCCESS;
1784                 }
1785                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1786                         op->o_tmpmemctx );
1787                 rs->sr_ctrls[1] = NULL;
1788                 rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
1789                         LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
1790         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
1791                 struct berval cookie;
1792
1793                 slap_compose_sync_cookie( op, &cookie, &ss->ss_ctxcsn,
1794                         srs->sr_state.rid );
1795
1796                 /* Is this a regular refresh? */
1797                 if ( !ss->ss_so ) {
1798                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1799                                 op->o_tmpmemctx );
1800                         rs->sr_ctrls[1] = NULL;
1801                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
1802                                 0, 1, &cookie, ss->ss_present ?  LDAP_SYNC_REFRESH_PRESENTS :
1803                                         LDAP_SYNC_REFRESH_DELETES );
1804                 } else {
1805                 /* It's RefreshAndPersist, transition to Persist phase */
1806                         syncprov_sendinfo( op, rs, ( ss->ss_present && rs->sr_nentries ) ?
1807                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
1808                                 &cookie, 1, NULL, 0 );
1809                         /* Flush any queued persist messages */
1810                         if ( ss->ss_so->s_res ) {
1811                                 syncprov_qplay( op, on, ss->ss_so );
1812                         }
1813
1814                         /* Detach this Op from frontend control */
1815                         ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
1816
1817                         /* Turn off the refreshing flag */
1818                         ss->ss_so->s_flags ^= PS_IS_REFRESHING;
1819
1820                         syncprov_detach_op( op, ss->ss_so, on );
1821                         ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
1822
1823                         return LDAP_SUCCESS;
1824                 }
1825         }
1826
1827         return SLAP_CB_CONTINUE;
1828 }
1829
1830 static int
1831 syncprov_op_search( Operation *op, SlapReply *rs )
1832 {
1833         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1834         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
1835         slap_callback   *cb;
1836         int gotstate = 0, nochange = 0, do_present;
1837         syncops *sop = NULL;
1838         searchstate *ss;
1839         sync_control *srs;
1840         struct berval ctxcsn;
1841         char csnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1842
1843         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
1844
1845         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
1846                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
1847                 return rs->sr_err;
1848         }
1849
1850         do_present = si->si_nopres ? 0 : 1;
1851
1852         srs = op->o_controls[slap_cids.sc_LDAPsync];
1853         op->o_managedsait = SLAP_CONTROL_NONCRITICAL;
1854
1855         /* If this is a persistent search, set it up right away */
1856         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
1857                 syncops so = {0};
1858                 fbase_cookie fc;
1859                 opcookie opc;
1860                 slap_callback sc;
1861
1862                 fc.fss = &so;
1863                 fc.fbase = 0;
1864                 so.s_eid = NOID;
1865                 so.s_op = op;
1866                 so.s_flags = PS_IS_REFRESHING | PS_FIND_BASE;
1867                 /* syncprov_findbase expects to be called as a callback... */
1868                 sc.sc_private = &opc;
1869                 opc.son = on;
1870                 cb = op->o_callback;
1871                 op->o_callback = &sc;
1872                 rs->sr_err = syncprov_findbase( op, &fc );
1873                 op->o_callback = cb;
1874
1875                 if ( rs->sr_err != LDAP_SUCCESS ) {
1876                         send_ldap_result( op, rs );
1877                         return rs->sr_err;
1878                 }
1879                 sop = ch_malloc( sizeof( syncops ));
1880                 *sop = so;
1881                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
1882                 sop->s_rid = srs->sr_state.rid;
1883                 sop->s_inuse = 1;
1884
1885                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1886                 sop->s_next = si->si_ops;
1887                 si->si_ops = sop;
1888                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1889         }
1890
1891         /* snapshot the ctxcsn */
1892         ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1893         strcpy( csnbuf, si->si_ctxcsnbuf );
1894         ctxcsn.bv_len = si->si_ctxcsn.bv_len;
1895         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1896         ctxcsn.bv_val = csnbuf;
1897
1898         /* If we have a cookie, handle the PRESENT lookups */
1899         if ( !BER_BVISNULL( &srs->sr_state.ctxcsn )) {
1900                 sessionlog *sl;
1901
1902                 /* The cookie was validated when it was parsed, just use it */
1903
1904                 /* If just Refreshing and nothing has changed, shortcut it */
1905                 if ( bvmatch( &srs->sr_state.ctxcsn, &ctxcsn )) {
1906                         nochange = 1;
1907                         if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
1908                                 LDAPControl     *ctrls[2];
1909
1910                                 ctrls[0] = NULL;
1911                                 ctrls[1] = NULL;
1912                                 syncprov_done_ctrl( op, rs, ctrls, 0, 0,
1913                                         NULL, LDAP_SYNC_REFRESH_DELETES );
1914                                 rs->sr_ctrls = ctrls;
1915                                 rs->sr_err = LDAP_SUCCESS;
1916                                 send_ldap_result( op, rs );
1917                                 rs->sr_ctrls = NULL;
1918                                 return rs->sr_err;
1919                         }
1920                         goto shortcut;
1921                 }
1922                 /* Do we have a sessionlog for this search? */
1923                 sl=si->si_logs;
1924                 if ( sl ) {
1925                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1926                         if ( ber_bvcmp( &srs->sr_state.ctxcsn, &sl->sl_mincsn ) >= 0 ) {
1927                                 do_present = 0;
1928                                 /* mutex is unlocked in playlog */
1929                                 syncprov_playlog( op, rs, sl, &srs->sr_state.ctxcsn, &ctxcsn );
1930                         } else {
1931                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1932                         }
1933                 }
1934                 /* Is the CSN still present in the database? */
1935                 if ( syncprov_findcsn( op, FIND_CSN ) != LDAP_SUCCESS ) {
1936                         /* No, so a reload is required */
1937 #if 0           /* the consumer doesn't seem to send this hint */
1938                         if ( op->o_sync_rhint == 0 ) {
1939                                 send_ldap_error( op, rs, LDAP_SYNC_REFRESH_REQUIRED, "sync cookie is stale" );
1940                                 return rs->sr_err;
1941                         }
1942 #endif
1943                 } else {
1944                         gotstate = 1;
1945                         /* If changed and doing Present lookup, send Present UUIDs */
1946                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT ) !=
1947                                 LDAP_SUCCESS ) {
1948                                 send_ldap_result( op, rs );
1949                                 return rs->sr_err;
1950                         }
1951                 }
1952         }
1953
1954 shortcut:
1955         /* Append CSN range to search filter, save original filter
1956          * for persistent search evaluation
1957          */
1958         if ( sop ) {
1959                 sop->s_filterstr= op->ors_filterstr;
1960         }
1961
1962         /* If something changed, find the changes */
1963         if ( gotstate && !nochange ) {
1964                 Filter *fand, *fava;
1965
1966                 fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
1967                 fand->f_choice = LDAP_FILTER_AND;
1968                 fand->f_next = NULL;
1969                 fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
1970                 fand->f_and = fava;
1971                 fava->f_choice = LDAP_FILTER_GE;
1972                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
1973                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
1974 #ifdef LDAP_COMP_MATCH
1975                 fava->f_ava->aa_cf = NULL;
1976 #endif
1977                 ber_dupbv_x( &fava->f_ava->aa_value, &srs->sr_state.ctxcsn, op->o_tmpmemctx );
1978                 fava->f_next = op->ors_filter;
1979                 op->ors_filter = fand;
1980                 filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
1981         }
1982
1983         /* Let our callback add needed info to returned entries */
1984         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
1985         ss = (searchstate *)(cb+1);
1986         ss->ss_on = on;
1987         ss->ss_so = sop;
1988         ss->ss_present = do_present;
1989         ss->ss_ctxcsn.bv_len = ctxcsn.bv_len;
1990         ss->ss_ctxcsn.bv_val = ss->ss_csnbuf;
1991         strcpy( ss->ss_ctxcsn.bv_val, ctxcsn.bv_val );
1992         cb->sc_response = syncprov_search_response;
1993         cb->sc_cleanup = syncprov_search_cleanup;
1994         cb->sc_private = ss;
1995         cb->sc_next = op->o_callback;
1996         op->o_callback = cb;
1997
1998 #if 0   /* I don't think we need to shortcircuit back-bdb any more */
1999         op->o_sync_mode &= SLAP_CONTROL_MASK;
2000 #endif
2001
2002         /* If this is a persistent search and no changes were reported during
2003          * the refresh phase, just invoke the response callback to transition
2004          * us into persist phase
2005          */
2006         if ( nochange ) {
2007                 rs->sr_err = LDAP_SUCCESS;
2008                 rs->sr_nentries = 0;
2009                 send_ldap_result( op, rs );
2010                 return rs->sr_err;
2011         }
2012         return SLAP_CB_CONTINUE;
2013 }
2014
2015 static int
2016 syncprov_operational(
2017         Operation *op,
2018         SlapReply *rs )
2019 {
2020         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2021         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2022
2023         if ( rs->sr_entry &&
2024                 dn_match( &rs->sr_entry->e_nname, op->o_bd->be_nsuffix )) {
2025
2026                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
2027                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
2028                         Attribute *a, **ap = NULL;
2029
2030                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
2031                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
2032                                         break;
2033                         }
2034
2035                         if ( !a ) {
2036                                 for ( ap = &rs->sr_operational_attrs; *ap; ap=&(*ap)->a_next );
2037
2038                                 a = ch_malloc( sizeof(Attribute));
2039                                 a->a_desc = slap_schema.si_ad_contextCSN;
2040                                 a->a_vals = ch_malloc( 2 * sizeof(struct berval));
2041                                 a->a_vals[1].bv_val = NULL;
2042                                 a->a_nvals = a->a_vals;
2043                                 a->a_next = NULL;
2044                                 a->a_flags = 0;
2045                                 *ap = a;
2046                         }
2047
2048                         ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
2049                         if ( !ap ) {
2050                                 strcpy( a->a_vals[0].bv_val, si->si_ctxcsnbuf );
2051                         } else {
2052                                 ber_dupbv( &a->a_vals[0], &si->si_ctxcsn );
2053                         }
2054                         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
2055                 }
2056         }
2057         return SLAP_CB_CONTINUE;
2058 }
2059
2060 enum {
2061         SP_CHKPT = 1,
2062         SP_SESSL,
2063         SP_NOPRES
2064 };
2065
2066 static ConfigDriver sp_cf_gen;
2067
2068 static ConfigTable spcfg[] = {
2069         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2070                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2071                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2072                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2073         { "syncprov-sessionlog", "ops", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2074                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2075                         "DESC 'Session log size in ops' "
2076                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2077         { "syncprov-nopresent", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_NOPRES,
2078                 sp_cf_gen, "( OLcfgOvAt:1.3 NAME 'olcSpNoPresent' "
2079                         "DESC 'Omit Present phase processing' "
2080                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2081         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2082 };
2083
2084 static ConfigOCs spocs[] = {
2085         { "( OLcfgOvOc:1.1 "
2086                 "NAME 'olcSyncProvConfig' "
2087                 "DESC 'SyncRepl Provider configuration' "
2088                 "SUP olcOverlayConfig "
2089                 "MAY ( olcSpCheckpoint $ olcSpSessionlog $ olcSpNoPresent ) )",
2090                         Cft_Overlay, spcfg },
2091         { NULL, 0, NULL }
2092 };
2093
2094 static int
2095 sp_cf_gen(ConfigArgs *c)
2096 {
2097         slap_overinst           *on = (slap_overinst *)c->bi;
2098         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2099         int rc = 0;
2100
2101         if ( c->op == SLAP_CONFIG_EMIT ) {
2102                 switch ( c->type ) {
2103                 case SP_CHKPT:
2104                         if ( si->si_chkops || si->si_chktime ) {
2105                                 struct berval bv;
2106                                 bv.bv_len = sprintf( c->msg, "%d %d",
2107                                         si->si_chkops, si->si_chktime );
2108                                 bv.bv_val = c->msg;
2109                                 value_add_one( &c->rvalue_vals, &bv );
2110                         } else {
2111                                 rc = 1;
2112                         }
2113                         break;
2114                 case SP_SESSL:
2115                         if ( si->si_logs ) {
2116                                 c->value_int = si->si_logs->sl_size;
2117                         } else {
2118                                 rc = 1;
2119                         }
2120                         break;
2121                 case SP_NOPRES:
2122                         if ( si->si_nopres ) {
2123                                 c->value_int = 1;
2124                         } else {
2125                                 rc = 1;
2126                         }
2127                         break;
2128                 }
2129                 return rc;
2130         } else if ( c->op == LDAP_MOD_DELETE ) {
2131                 switch ( c->type ) {
2132                 case SP_CHKPT:
2133                         si->si_chkops = 0;
2134                         si->si_chktime = 0;
2135                         break;
2136                 case SP_SESSL:
2137                         if ( si->si_logs )
2138                                 si->si_logs->sl_size = 0;
2139                         else
2140                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2141                         break;
2142                 case SP_NOPRES:
2143                         if ( si->si_nopres )
2144                                 si->si_nopres = 0;
2145                         else
2146                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2147                         break;
2148                 }
2149                 return rc;
2150         }
2151         switch ( c->type ) {
2152         case SP_CHKPT:
2153                 si->si_chkops = atoi( c->argv[1] );
2154                 si->si_chktime = atoi( c->argv[2] ) * 60;
2155                 break;
2156         case SP_SESSL: {
2157                 sessionlog *sl;
2158                 int size = c->value_int;
2159
2160                 if ( size < 0 ) {
2161                         sprintf( c->msg, "%s size %d is negative",
2162                                 c->argv[0], size );
2163                         Debug( LDAP_DEBUG_CONFIG, "%s: %s\n", c->log, c->msg, 0 );
2164                         return ARG_BAD_CONF;
2165                 }
2166                 sl = si->si_logs;
2167                 if ( !sl ) {
2168                         sl = ch_malloc( sizeof( sessionlog ) + LDAP_LUTIL_CSNSTR_BUFSIZE );
2169                         sl->sl_mincsn.bv_val = (char *)(sl+1);
2170                         sl->sl_mincsn.bv_len = 0;
2171                         sl->sl_num = 0;
2172                         sl->sl_head = sl->sl_tail = NULL;
2173                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
2174                         si->si_logs = sl;
2175                 }
2176                 sl->sl_size = size;
2177                 }
2178                 break;
2179         case SP_NOPRES:
2180                 si->si_nopres = c->value_int;
2181                 break;
2182         }
2183         return rc;
2184 }
2185
2186 /* ITS#3456 we cannot run this search on the main thread, must use a
2187  * child thread in order to insure we have a big enough stack.
2188  */
2189 static void *
2190 syncprov_db_otask(
2191         void *ptr
2192 )
2193 {
2194         syncprov_findcsn( ptr, FIND_MAXCSN );
2195         return NULL;
2196 }
2197
2198 /* Read any existing contextCSN from the underlying db.
2199  * Then search for any entries newer than that. If no value exists,
2200  * just generate it. Cache whatever result.
2201  */
2202 static int
2203 syncprov_db_open(
2204     BackendDB *be
2205 )
2206 {
2207         slap_overinst   *on = (slap_overinst *) be->bd_info;
2208         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2209
2210         Connection conn;
2211         char opbuf[OPERATION_BUFFER_SIZE];
2212         char ctxcsnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
2213         Operation *op = (Operation *)opbuf;
2214         Entry *e;
2215         Attribute *a;
2216         int rc;
2217         void *thrctx = NULL;
2218
2219         if ( slapMode & SLAP_TOOL_MODE ) {
2220                 return 0;
2221         }
2222
2223         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
2224         if ( rc ) {
2225                 return rc;
2226         }
2227
2228         thrctx = ldap_pvt_thread_pool_context();
2229         connection_fake_init( &conn, op, thrctx );
2230         op->o_bd = be;
2231         op->o_dn = be->be_rootdn;
2232         op->o_ndn = be->be_rootndn;
2233
2234         ctxcsnbuf[0] = '\0';
2235
2236         op->o_bd->bd_info = on->on_info->oi_orig;
2237         rc = be_entry_get_rw( op, be->be_nsuffix, NULL,
2238                 slap_schema.si_ad_contextCSN, 0, &e );
2239
2240         if ( e ) {
2241                 ldap_pvt_thread_t tid;
2242
2243                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
2244                 if ( a ) {
2245                         si->si_ctxcsn.bv_len = a->a_nvals[0].bv_len;
2246                         if ( si->si_ctxcsn.bv_len >= sizeof(si->si_ctxcsnbuf ))
2247                                 si->si_ctxcsn.bv_len = sizeof(si->si_ctxcsnbuf)-1;
2248                         strncpy( si->si_ctxcsnbuf, a->a_nvals[0].bv_val,
2249                                 si->si_ctxcsn.bv_len );
2250                         si->si_ctxcsnbuf[si->si_ctxcsn.bv_len] = '\0';
2251                         strcpy( ctxcsnbuf, si->si_ctxcsnbuf );
2252                 }
2253                 be_entry_release_rw( op, e, 0 );
2254                 op->o_bd->bd_info = (BackendInfo *)on;
2255                 op->o_req_dn = be->be_suffix[0];
2256                 op->o_req_ndn = be->be_nsuffix[0];
2257                 op->ors_scope = LDAP_SCOPE_SUBTREE;
2258                 ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
2259                 ldap_pvt_thread_join( tid, NULL );
2260         } else if ( SLAP_SYNC_SHADOW( op->o_bd )) {
2261                 /* If we're also a consumer, and we didn't find the context entry,
2262                  * then don't generate anything, wait for our provider to send it
2263                  * to us.
2264                  */
2265                 goto out;
2266         }
2267
2268         if ( BER_BVISEMPTY( &si->si_ctxcsn ) ) {
2269                 slap_get_csn( op, si->si_ctxcsnbuf, sizeof(si->si_ctxcsnbuf),
2270                                 &si->si_ctxcsn, 0 );
2271         }
2272
2273         /* If our ctxcsn is different from what was read from the root
2274          * entry, make sure we do a checkpoint on close
2275          */
2276         if ( strcmp( si->si_ctxcsnbuf, ctxcsnbuf )) {
2277                 si->si_numops++;
2278         }
2279
2280 out:
2281         op->o_bd->bd_info = (BackendInfo *)on;
2282         ldap_pvt_thread_pool_context_reset( thrctx );
2283         return 0;
2284 }
2285
2286 /* Write the current contextCSN into the underlying db.
2287  */
2288 static int
2289 syncprov_db_close(
2290     BackendDB *be
2291 )
2292 {
2293     slap_overinst   *on = (slap_overinst *) be->bd_info;
2294     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2295
2296         if ( slapMode & SLAP_TOOL_MODE ) {
2297                 return 0;
2298         }
2299         if ( si->si_numops ) {
2300                 Connection conn;
2301                 char opbuf[OPERATION_BUFFER_SIZE];
2302                 Operation *op = (Operation *)opbuf;
2303                 SlapReply rs = {REP_RESULT};
2304                 void *thrctx;
2305
2306                 thrctx = ldap_pvt_thread_pool_context();
2307                 connection_fake_init( &conn, op, thrctx );
2308                 op->o_bd = be;
2309                 op->o_dn = be->be_rootdn;
2310                 op->o_ndn = be->be_rootndn;
2311                 syncprov_checkpoint( op, &rs, on );
2312                 ldap_pvt_thread_pool_context_reset( thrctx );
2313         }
2314
2315     return 0;
2316 }
2317
2318 static int
2319 syncprov_db_init(
2320         BackendDB *be
2321 )
2322 {
2323         slap_overinst   *on = (slap_overinst *)be->bd_info;
2324         syncprov_info_t *si;
2325
2326         si = ch_calloc(1, sizeof(syncprov_info_t));
2327         on->on_bi.bi_private = si;
2328         ldap_pvt_thread_mutex_init( &si->si_csn_mutex );
2329         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
2330         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
2331         si->si_ctxcsn.bv_val = si->si_ctxcsnbuf;
2332
2333         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
2334         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
2335         csn_anlist[1].an_desc = slap_schema.si_ad_entryUUID;
2336         csn_anlist[1].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2337
2338         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
2339         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2340
2341         return 0;
2342 }
2343
2344 static int
2345 syncprov_db_destroy(
2346         BackendDB *be
2347 )
2348 {
2349         slap_overinst   *on = (slap_overinst *)be->bd_info;
2350         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2351
2352         if ( si ) {
2353                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
2354                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
2355                 ldap_pvt_thread_mutex_destroy( &si->si_csn_mutex );
2356                 ch_free( si );
2357         }
2358
2359         return 0;
2360 }
2361
2362 static int syncprov_parseCtrl (
2363         Operation *op,
2364         SlapReply *rs,
2365         LDAPControl *ctrl )
2366 {
2367         ber_tag_t tag;
2368         BerElementBuffer berbuf;
2369         BerElement *ber = (BerElement *)&berbuf;
2370         ber_int_t mode;
2371         ber_len_t len;
2372         struct berval cookie = BER_BVNULL;
2373         sync_control *sr;
2374         int rhint = 0;
2375
2376         if ( op->o_sync != SLAP_CONTROL_NONE ) {
2377                 rs->sr_text = "Sync control specified multiple times";
2378                 return LDAP_PROTOCOL_ERROR;
2379         }
2380
2381         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
2382                 rs->sr_text = "Sync control specified with pagedResults control";
2383                 return LDAP_PROTOCOL_ERROR;
2384         }
2385
2386         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
2387                 rs->sr_text = "Sync control value is empty (or absent)";
2388                 return LDAP_PROTOCOL_ERROR;
2389         }
2390
2391         /* Parse the control value
2392          *      syncRequestValue ::= SEQUENCE {
2393          *              mode   ENUMERATED {
2394          *                      -- 0 unused
2395          *                      refreshOnly             (1),
2396          *                      -- 2 reserved
2397          *                      refreshAndPersist       (3)
2398          *              },
2399          *              cookie  syncCookie OPTIONAL
2400          *      }
2401          */
2402
2403         ber_init2( ber, &ctrl->ldctl_value, 0 );
2404
2405         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
2406                 rs->sr_text = "Sync control : mode decoding error";
2407                 return LDAP_PROTOCOL_ERROR;
2408         }
2409
2410         switch( mode ) {
2411         case LDAP_SYNC_REFRESH_ONLY:
2412                 mode = SLAP_SYNC_REFRESH;
2413                 break;
2414         case LDAP_SYNC_REFRESH_AND_PERSIST:
2415                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
2416                 break;
2417         default:
2418                 rs->sr_text = "Sync control : unknown update mode";
2419                 return LDAP_PROTOCOL_ERROR;
2420         }
2421
2422         tag = ber_peek_tag( ber, &len );
2423
2424         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
2425                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
2426                         rs->sr_text = "Sync control : cookie decoding error";
2427                         return LDAP_PROTOCOL_ERROR;
2428                 }
2429         }
2430         if ( tag == LDAP_TAG_RELOAD_HINT ) {
2431                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
2432                         rs->sr_text = "Sync control : rhint decoding error";
2433                         return LDAP_PROTOCOL_ERROR;
2434                 }
2435         }
2436         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
2437                         rs->sr_text = "Sync control : decoding error";
2438                         return LDAP_PROTOCOL_ERROR;
2439         }
2440         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
2441         sr->sr_rhint = rhint;
2442         if (!BER_BVISNULL(&cookie)) {
2443                 ber_dupbv_x( &sr->sr_state.octet_str, &cookie, op->o_tmpmemctx );
2444                 slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx );
2445                 if ( sr->sr_state.rid == -1 ) {
2446                         rs->sr_text = "Sync control : cookie parsing error";
2447                         return LDAP_PROTOCOL_ERROR;
2448                 }
2449         }
2450
2451         op->o_controls[slap_cids.sc_LDAPsync] = sr;
2452
2453         op->o_sync = ctrl->ldctl_iscritical
2454                 ? SLAP_CONTROL_CRITICAL
2455                 : SLAP_CONTROL_NONCRITICAL;
2456
2457         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
2458
2459         return LDAP_SUCCESS;
2460 }
2461
2462 /* This overlay is set up for dynamic loading via moduleload. For static
2463  * configuration, you'll need to arrange for the slap_overinst to be
2464  * initialized and registered by some other function inside slapd.
2465  */
2466
2467 static slap_overinst            syncprov;
2468
2469 int
2470 syncprov_init()
2471 {
2472         int rc;
2473
2474         rc = register_supported_control( LDAP_CONTROL_SYNC,
2475                 SLAP_CTRL_HIDE|SLAP_CTRL_SEARCH, NULL,
2476                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
2477         if ( rc != LDAP_SUCCESS ) {
2478                 Debug( LDAP_DEBUG_ANY,
2479                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
2480                 return rc;
2481         }
2482
2483         syncprov.on_bi.bi_type = "syncprov";
2484         syncprov.on_bi.bi_db_init = syncprov_db_init;
2485         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
2486         syncprov.on_bi.bi_db_open = syncprov_db_open;
2487         syncprov.on_bi.bi_db_close = syncprov_db_close;
2488
2489         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
2490         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
2491
2492         syncprov.on_bi.bi_op_add = syncprov_op_mod;
2493         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
2494         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
2495         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
2496         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
2497         syncprov.on_bi.bi_op_search = syncprov_op_search;
2498         syncprov.on_bi.bi_extended = syncprov_op_extended;
2499         syncprov.on_bi.bi_operational = syncprov_operational;
2500
2501         syncprov.on_bi.bi_cf_ocs = spocs;
2502
2503         rc = config_register_schema( spcfg, spocs );
2504         if ( rc ) return rc;
2505
2506         return overlay_register( &syncprov );
2507 }
2508
2509 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
2510 int
2511 init_module( int argc, char *argv[] )
2512 {
2513         return syncprov_init();
2514 }
2515 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
2516
2517 #endif /* defined(SLAPD_OVER_SYNCPROV) */