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 2004-2008 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         int             s_sid;
  63         struct berval s_filterstr;
  64         int             s_flags;        /* search status */
  65 #define PS_IS_REFRESHING        0x01
  66 #define PS_IS_DETACHED          0x02
  67 #define PS_WROTE_BASE           0x04
  68 #define PS_FIND_BASE            0x08
  69 #define PS_FIX_FILTER           0x10
  70
  71         int             s_inuse;        /* reference count */
  72         struct syncres *s_res;
  73         struct syncres *s_restail;
  74         struct re_s     *s_qtask;       /* task for playing psearch responses */
  75 #define RUNQ_INTERVAL   36000   /* a long time */
  76         ldap_pvt_thread_mutex_t s_mutex;
  77 } syncops;
  78
  79 /* A received sync control */
  80 typedef struct sync_control {
  81         struct sync_cookie sr_state;
  82         int sr_rhint;
  83 } sync_control;
  84
  85 #if 0 /* moved back to slap.h */
  86 #define o_sync  o_ctrlflag[slap_cids.sc_LDAPsync]
  87 #endif
  88 /* o_sync_mode uses data bits of o_sync */
  89 #define o_sync_mode     o_ctrlflag[slap_cids.sc_LDAPsync]
  90
  91 #define SLAP_SYNC_NONE                                  (LDAP_SYNC_NONE<<SLAP_CONTROL_SHIFT)
  92 #define SLAP_SYNC_REFRESH                               (LDAP_SYNC_REFRESH_ONLY<<SLAP_CONTROL_SHIFT)
  93 #define SLAP_SYNC_PERSIST                               (LDAP_SYNC_RESERVED<<SLAP_CONTROL_SHIFT)
  94 #define SLAP_SYNC_REFRESH_AND_PERSIST   (LDAP_SYNC_REFRESH_AND_PERSIST<<SLAP_CONTROL_SHIFT)
  95
  96 /* Record of which searches matched at premodify step */
  97 typedef struct syncmatches {
  98         struct syncmatches *sm_next;
  99         syncops *sm_op;
 100 } syncmatches;
 101
 102 /* Session log data */
 103 typedef struct slog_entry {
 104         struct slog_entry *se_next;
 105         struct berval se_uuid;
 106         struct berval se_csn;
 107         int     se_sid;
 108         ber_tag_t       se_tag;
 109 } slog_entry;
 110
 111 typedef struct sessionlog {
 112         struct berval   sl_mincsn;
 113         int             sl_num;
 114         int             sl_size;
 115         slog_entry *sl_head;
 116         slog_entry *sl_tail;
 117         ldap_pvt_thread_mutex_t sl_mutex;
 118 } sessionlog;
 119
 120 /* The main state for this overlay */
 121 typedef struct syncprov_info_t {
 122         syncops         *si_ops;
 123         BerVarray       si_ctxcsn;      /* ldapsync context */
 124         int             *si_sids;
 125         int             si_numcsns;
 126         int             si_chkops;      /* checkpointing info */
 127         int             si_chktime;
 128         int             si_numops;      /* number of ops since last checkpoint */
 129         int             si_nopres;      /* Skip present phase */
 130         int             si_usehint;     /* use reload hint */
 131         time_t  si_chklast;     /* time of last checkpoint */
 132         Avlnode *si_mods;       /* entries being modified */
 133         sessionlog      *si_logs;
 134         ldap_pvt_thread_rdwr_t  si_csn_rwlock;
 135         ldap_pvt_thread_mutex_t si_ops_mutex;
 136         ldap_pvt_thread_mutex_t si_mods_mutex;
 137 } syncprov_info_t;
 138
 139 typedef struct opcookie {
 140         slap_overinst *son;
 141         syncmatches *smatches;
 142         struct berval sdn;      /* DN of entry, for deletes */
 143         struct berval sndn;
 144         struct berval suuid;    /* UUID of entry */
 145         struct berval sctxcsn;
 146         int sreference; /* Is the entry a reference? */
 147 } opcookie;
 148
 149 typedef struct fbase_cookie {
 150         struct berval *fdn;     /* DN of a modified entry, for scope testing */
 151         syncops *fss;   /* persistent search we're testing against */
 152         int fbase;      /* if TRUE we found the search base and it's still valid */
 153         int fscope;     /* if TRUE then fdn is within the psearch scope */
 154 } fbase_cookie;
 155
 156 static AttributeName csn_anlist[3];
 157 static AttributeName uuid_anlist[2];
 158
 159 /* Build a LDAPsync intermediate state control */
 160 static int
 161 syncprov_state_ctrl(
 162         Operation       *op,
 163         SlapReply       *rs,
 164         Entry           *e,
 165         int             entry_sync_state,
 166         LDAPControl     **ctrls,
 167         int             num_ctrls,
 168         int             send_cookie,
 169         struct berval   *cookie )
 170 {
 171         Attribute* a;
 172         int ret;
 173
 174         BerElementBuffer berbuf;
 175         BerElement *ber = (BerElement *)&berbuf;
 176
 177         struct berval   entryuuid_bv = BER_BVNULL;
 178
 179         ber_init2( ber, 0, LBER_USE_DER );
 180         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 181
 182         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 183
 184         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 185                 AttributeDescription *desc = a->a_desc;
 186                 if ( desc == slap_schema.si_ad_entryUUID ) {
 187                         entryuuid_bv = a->a_nvals[0];
 188                         break;
 189                 }
 190         }
 191
 192         /* FIXME: what if entryuuid is NULL or empty ? */
 193
 194         if ( send_cookie && cookie ) {
 195                 ber_printf( ber, "{eOON}",
 196                         entry_sync_state, &entryuuid_bv, cookie );
 197         } else {
 198                 ber_printf( ber, "{eON}",
 199                         entry_sync_state, &entryuuid_bv );
 200         }
 201
 202         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 203         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 204         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 205
 206         ber_free_buf( ber );
 207
 208         if ( ret < 0 ) {
 209                 Debug( LDAP_DEBUG_TRACE,
 210                         "slap_build_sync_ctrl: ber_flatten2 failed\n",
 211                         0, 0, 0 );
 212                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 213                 return ret;
 214         }
 215
 216         return LDAP_SUCCESS;
 217 }
 218
 219 /* Build a LDAPsync final state control */
 220 static int
 221 syncprov_done_ctrl(
 222         Operation       *op,
 223         SlapReply       *rs,
 224         LDAPControl     **ctrls,
 225         int                     num_ctrls,
 226         int                     send_cookie,
 227         struct berval *cookie,
 228         int                     refreshDeletes )
 229 {
 230         int ret;
 231         BerElementBuffer berbuf;
 232         BerElement *ber = (BerElement *)&berbuf;
 233
 234         ber_init2( ber, NULL, LBER_USE_DER );
 235         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 236
 237         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 238
 239         ber_printf( ber, "{" );
 240         if ( send_cookie && cookie ) {
 241                 ber_printf( ber, "O", cookie );
 242         }
 243         if ( refreshDeletes == LDAP_SYNC_REFRESH_DELETES ) {
 244                 ber_printf( ber, "b", refreshDeletes );
 245         }
 246         ber_printf( ber, "N}" );
 247
 248         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_DONE;
 249         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 250         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 251
 252         ber_free_buf( ber );
 253
 254         if ( ret < 0 ) {
 255                 Debug( LDAP_DEBUG_TRACE,
 256                         "syncprov_done_ctrl: ber_flatten2 failed\n",
 257                         0, 0, 0 );
 258                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 259                 return ret;
 260         }
 261
 262         return LDAP_SUCCESS;
 263 }
 264
 265 static int
 266 syncprov_sendinfo(
 267         Operation       *op,
 268         SlapReply       *rs,
 269         int                     type,
 270         struct berval *cookie,
 271         int                     refreshDone,
 272         BerVarray       syncUUIDs,
 273         int                     refreshDeletes )
 274 {
 275         BerElementBuffer berbuf;
 276         BerElement *ber = (BerElement *)&berbuf;
 277         struct berval rspdata;
 278
 279         int ret;
 280
 281         ber_init2( ber, NULL, LBER_USE_DER );
 282         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 283
 284         if ( type ) {
 285                 switch ( type ) {
 286                 case LDAP_TAG_SYNC_NEW_COOKIE:
 287                         ber_printf( ber, "tO", type, cookie );
 288                         break;
 289                 case LDAP_TAG_SYNC_REFRESH_DELETE:
 290                 case LDAP_TAG_SYNC_REFRESH_PRESENT:
 291                         ber_printf( ber, "t{", type );
 292                         if ( cookie ) {
 293                                 ber_printf( ber, "O", cookie );
 294                         }
 295                         if ( refreshDone == 0 ) {
 296                                 ber_printf( ber, "b", refreshDone );
 297                         }
 298                         ber_printf( ber, "N}" );
 299                         break;
 300                 case LDAP_TAG_SYNC_ID_SET:
 301                         ber_printf( ber, "t{", type );
 302                         if ( cookie ) {
 303                                 ber_printf( ber, "O", cookie );
 304                         }
 305                         if ( refreshDeletes == 1 ) {
 306                                 ber_printf( ber, "b", refreshDeletes );
 307                         }
 308                         ber_printf( ber, "[W]", syncUUIDs );
 309                         ber_printf( ber, "N}" );
 310                         break;
 311                 default:
 312                         Debug( LDAP_DEBUG_TRACE,
 313                                 "syncprov_sendinfo: invalid syncinfo type (%d)\n",
 314                                 type, 0, 0 );
 315                         return LDAP_OTHER;
 316                 }
 317         }
 318
 319         ret = ber_flatten2( ber, &rspdata, 0 );
 320
 321         if ( ret < 0 ) {
 322                 Debug( LDAP_DEBUG_TRACE,
 323                         "syncprov_sendinfo: ber_flatten2 failed\n",
 324                         0, 0, 0 );
 325                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 326                 return ret;
 327         }
 328
 329         rs->sr_rspoid = LDAP_SYNC_INFO;
 330         rs->sr_rspdata = &rspdata;
 331         send_ldap_intermediate( op, rs );
 332         rs->sr_rspdata = NULL;
 333         ber_free_buf( ber );
 334
 335         return LDAP_SUCCESS;
 336 }
 337
 338 /* Find a modtarget in an AVL tree */
 339 static int
 340 sp_avl_cmp( const void *c1, const void *c2 )
 341 {
 342         const modtarget *m1, *m2;
 343         int rc;
 344
 345         m1 = c1; m2 = c2;
 346         rc = m1->mt_op->o_req_ndn.bv_len - m2->mt_op->o_req_ndn.bv_len;
 347
 348         if ( rc ) return rc;
 349         return ber_bvcmp( &m1->mt_op->o_req_ndn, &m2->mt_op->o_req_ndn );
 350 }
 351
 352 /* syncprov_findbase:
 353  *   finds the true DN of the base of a search (with alias dereferencing) and
 354  * checks to make sure the base entry doesn't get replaced with a different
 355  * entry (e.g., swapping trees via ModDN, or retargeting an alias). If a
 356  * change is detected, any persistent search on this base must be terminated /
 357  * reloaded.
 358  *   On the first call, we just save the DN and entryID. On subsequent calls
 359  * we compare the DN and entryID with the saved values.
 360  */
 361 static int
 362 findbase_cb( Operation *op, SlapReply *rs )
 363 {
 364         slap_callback *sc = op->o_callback;
 365
 366         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 367                 fbase_cookie *fc = sc->sc_private;
 368
 369                 /* If no entryID, we're looking for the first time.
 370                  * Just store whatever we got.
 371                  */
 372                 if ( fc->fss->s_eid == NOID ) {
 373                         fc->fbase = 2;
 374                         fc->fss->s_eid = rs->sr_entry->e_id;
 375                         ber_dupbv( &fc->fss->s_base, &rs->sr_entry->e_nname );
 376
 377                 } else if ( rs->sr_entry->e_id == fc->fss->s_eid &&
 378                         dn_match( &rs->sr_entry->e_nname, &fc->fss->s_base )) {
 379
 380                 /* OK, the DN is the same and the entryID is the same. */
 381                         fc->fbase = 1;
 382                 }
 383         }
 384         if ( rs->sr_err != LDAP_SUCCESS ) {
 385                 Debug( LDAP_DEBUG_ANY, "findbase failed! %d\n", rs->sr_err,0,0 );
 386         }
 387         return LDAP_SUCCESS;
 388 }
 389
 390 static Filter generic_filter = { LDAP_FILTER_PRESENT, { 0 }, NULL };
 391 static struct berval generic_filterstr = BER_BVC("(objectclass=*)");
 392
 393 static int
 394 syncprov_findbase( Operation *op, fbase_cookie *fc )
 395 {
 396         opcookie *opc = op->o_callback->sc_private;
 397         slap_overinst *on = opc->son;
 398
 399         /* Use basic parameters from syncrepl search, but use
 400          * current op's threadctx / tmpmemctx
 401          */
 402         ldap_pvt_thread_mutex_lock( &fc->fss->s_mutex );
 403         if ( fc->fss->s_flags & PS_FIND_BASE ) {
 404                 slap_callback cb = {0};
 405                 Operation fop;
 406                 SlapReply frs = { REP_RESULT };
 407                 BackendInfo *bi;
 408                 int rc;
 409
 410                 fc->fss->s_flags ^= PS_FIND_BASE;
 411                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 412
 413                 fop = *fc->fss->s_op;
 414
 415                 fop.o_hdr = op->o_hdr;
 416                 fop.o_bd = op->o_bd;
 417                 fop.o_time = op->o_time;
 418                 fop.o_tincr = op->o_tincr;
 419                 bi = op->o_bd->bd_info;
 420
 421                 cb.sc_response = findbase_cb;
 422                 cb.sc_private = fc;
 423
 424                 fop.o_sync_mode = 0;    /* turn off sync mode */
 425                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 426                 fop.o_callback = &cb;
 427                 fop.o_tag = LDAP_REQ_SEARCH;
 428                 fop.ors_scope = LDAP_SCOPE_BASE;
 429                 fop.ors_limit = NULL;
 430                 fop.ors_slimit = 1;
 431                 fop.ors_tlimit = SLAP_NO_LIMIT;
 432                 fop.ors_attrs = slap_anlist_no_attrs;
 433                 fop.ors_attrsonly = 1;
 434                 fop.ors_filter = &generic_filter;
 435                 fop.ors_filterstr = generic_filterstr;
 436
 437                 rc = overlay_op_walk( &fop, &frs, op_search, on->on_info, on );
 438                 op->o_bd->bd_info = bi;
 439         } else {
 440                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 441                 fc->fbase = 1;
 442         }
 443
 444         /* After the first call, see if the fdn resides in the scope */
 445         if ( fc->fbase == 1 ) {
 446                 switch ( fc->fss->s_op->ors_scope ) {
 447                 case LDAP_SCOPE_BASE:
 448                         fc->fscope = dn_match( fc->fdn, &fc->fss->s_base );
 449                         break;
 450                 case LDAP_SCOPE_ONELEVEL: {
 451                         struct berval pdn;
 452                         dnParent( fc->fdn, &pdn );
 453                         fc->fscope = dn_match( &pdn, &fc->fss->s_base );
 454                         break; }
 455                 case LDAP_SCOPE_SUBTREE:
 456                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base );
 457                         break;
 458                 case LDAP_SCOPE_SUBORDINATE:
 459                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base ) &&
 460                                 !dn_match( fc->fdn, &fc->fss->s_base );
 461                         break;
 462                 }
 463         }
 464
 465         if ( fc->fbase )
 466                 return LDAP_SUCCESS;
 467
 468         /* If entryID has changed, then the base of this search has
 469          * changed. Invalidate the psearch.
 470          */
 471         return LDAP_NO_SUCH_OBJECT;
 472 }
 473
 474 /* syncprov_findcsn:
 475  *   This function has three different purposes, but they all use a search
 476  * that filters on entryCSN so they're combined here.
 477  * 1: at startup time, after a contextCSN has been read from the database,
 478  * we search for all entries with CSN >= contextCSN in case the contextCSN
 479  * was not checkpointed at the previous shutdown.
 480  *
 481  * 2: when the current contextCSN is known and we have a sync cookie, we search
 482  * for one entry with CSN = the cookie CSN. If not found, try <= cookie CSN.
 483  * If an entry is found, the cookie CSN is valid, otherwise it is stale.
 484  *
 485  * 3: during a refresh phase, we search for all entries with CSN <= the cookie
 486  * CSN, and generate Present records for them. We always collect this result
 487  * in SyncID sets, even if there's only one match.
 488  */
 489 typedef enum find_csn_t {
 490         FIND_MAXCSN     = 1,
 491         FIND_CSN        = 2,
 492         FIND_PRESENT    = 3
 493 } find_csn_t;
 494
 495 static int
 496 findmax_cb( Operation *op, SlapReply *rs )
 497 {
 498         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 499                 struct berval *maxcsn = op->o_callback->sc_private;
 500                 Attribute *a = attr_find( rs->sr_entry->e_attrs,
 501                         slap_schema.si_ad_entryCSN );
 502
 503                 if ( a && ber_bvcmp( &a->a_vals[0], maxcsn ) > 0 ) {
 504                         maxcsn->bv_len = a->a_vals[0].bv_len;
 505                         strcpy( maxcsn->bv_val, a->a_vals[0].bv_val );
 506                 }
 507         }
 508         return LDAP_SUCCESS;
 509 }
 510
 511 static int
 512 findcsn_cb( Operation *op, SlapReply *rs )
 513 {
 514         slap_callback *sc = op->o_callback;
 515
 516         /* We just want to know that at least one exists, so it's OK if
 517          * we exceed the unchecked limit.
 518          */
 519         if ( rs->sr_err == LDAP_ADMINLIMIT_EXCEEDED ||
 520                 (rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS )) {
 521                 sc->sc_private = (void *)1;
 522         }
 523         return LDAP_SUCCESS;
 524 }
 525
 526 /* Build a list of entryUUIDs for sending in a SyncID set */
 527
 528 #define UUID_LEN        16
 529
 530 typedef struct fpres_cookie {
 531         int num;
 532         BerVarray uuids;
 533         char *last;
 534 } fpres_cookie;
 535
 536 static int
 537 findpres_cb( Operation *op, SlapReply *rs )
 538 {
 539         slap_callback *sc = op->o_callback;
 540         fpres_cookie *pc = sc->sc_private;
 541         Attribute *a;
 542         int ret = SLAP_CB_CONTINUE;
 543
 544         switch ( rs->sr_type ) {
 545         case REP_SEARCH:
 546                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryUUID );
 547                 if ( a ) {
 548                         pc->uuids[pc->num].bv_val = pc->last;
 549                         AC_MEMCPY( pc->uuids[pc->num].bv_val, a->a_nvals[0].bv_val,
 550                                 pc->uuids[pc->num].bv_len );
 551                         pc->num++;
 552                         pc->last = pc->uuids[pc->num].bv_val;
 553                         pc->uuids[pc->num].bv_val = NULL;
 554                 }
 555                 ret = LDAP_SUCCESS;
 556                 if ( pc->num != SLAP_SYNCUUID_SET_SIZE )
 557                         break;
 558                 /* FALLTHRU */
 559         case REP_RESULT:
 560                 ret = rs->sr_err;
 561                 if ( pc->num ) {
 562                         ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 563                                 0, pc->uuids, 0 );
 564                         pc->uuids[pc->num].bv_val = pc->last;
 565                         pc->num = 0;
 566                         pc->last = pc->uuids[0].bv_val;
 567                 }
 568                 break;
 569         default:
 570                 break;
 571         }
 572         return ret;
 573 }
 574
 575 static int
 576 syncprov_findcsn( Operation *op, find_csn_t mode )
 577 {
 578         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 579         syncprov_info_t         *si = on->on_bi.bi_private;
 580
 581         slap_callback cb = {0};
 582         Operation fop;
 583         SlapReply frs = { REP_RESULT };
 584         char buf[LDAP_LUTIL_CSNSTR_BUFSIZE + STRLENOF("(entryCSN<=)")];
 585         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 586         struct berval maxcsn;
 587         Filter cf;
 588         AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
 589         fpres_cookie pcookie;
 590         sync_control *srs = NULL;
 591         struct slap_limits_set fc_limits;
 592         int i, rc = LDAP_SUCCESS, findcsn_retry = 1;
 593         int maxid = 0;
 594
 595         if ( mode != FIND_MAXCSN ) {
 596                 srs = op->o_controls[slap_cids.sc_LDAPsync];
 597         }
 598
 599         fop = *op;
 600         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync_mode */
 601         /* We want pure entries, not referrals */
 602         fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 603
 604         cf.f_ava = &eq;
 605         cf.f_av_desc = slap_schema.si_ad_entryCSN;
 606         BER_BVZERO( &cf.f_av_value );
 607         cf.f_next = NULL;
 608
 609         fop.o_callback = &cb;
 610         fop.ors_limit = NULL;
 611         fop.ors_tlimit = SLAP_NO_LIMIT;
 612         fop.ors_filter = &cf;
 613         fop.ors_filterstr.bv_val = buf;
 614
 615 again:
 616         switch( mode ) {
 617         case FIND_MAXCSN:
 618                 cf.f_choice = LDAP_FILTER_GE;
 619                 cf.f_av_value = si->si_ctxcsn[0];
 620                 /* If there are multiple CSNs, use the largest */
 621                 for ( i=1; i<si->si_numcsns; i++) {
 622                         if ( ber_bvcmp( &cf.f_av_value, &si->si_ctxcsn[i] ) < 0 ) {
 623                                 cf.f_av_value = si->si_ctxcsn[i];
 624                                 maxid = i;
 625                         }
 626                 }
 627                 fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 628                         "(entryCSN>=%s)", cf.f_av_value.bv_val );
 629                 if ( fop.ors_filterstr.bv_len < 0 || fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 630                         return LDAP_OTHER;
 631                 }
 632                 fop.ors_attrsonly = 0;
 633                 fop.ors_attrs = csn_anlist;
 634                 fop.ors_slimit = SLAP_NO_LIMIT;
 635                 cb.sc_private = &maxcsn;
 636                 cb.sc_response = findmax_cb;
 637                 strcpy( cbuf, cf.f_av_value.bv_val );
 638                 maxcsn.bv_val = cbuf;
 639                 maxcsn.bv_len = cf.f_av_value.bv_len;
 640                 break;
 641         case FIND_CSN:
 642                 if ( BER_BVISEMPTY( &cf.f_av_value )) {
 643                         cf.f_av_value = srs->sr_state.ctxcsn[0];
 644                         /* If there are multiple CSNs, use the smallest */
 645                         for ( i=1; i<srs->sr_state.numcsns; i++ ) {
 646                                 if ( ber_bvcmp( &cf.f_av_value, &srs->sr_state.ctxcsn[i] )
 647                                         > 0 ) {
 648                                         cf.f_av_value = srs->sr_state.ctxcsn[i];
 649                                 }
 650                         }
 651                 }
 652                 /* Look for exact match the first time */
 653                 if ( findcsn_retry ) {
 654                         cf.f_choice = LDAP_FILTER_EQUALITY;
 655                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 656                                 "(entryCSN=%s)", cf.f_av_value.bv_val );
 657                 /* On retry, look for <= */
 658                 } else {
 659                         cf.f_choice = LDAP_FILTER_LE;
 660                         fop.ors_limit = &fc_limits;
 661                         memset( &fc_limits, 0, sizeof( fc_limits ));
 662                         fc_limits.lms_s_unchecked = 1;
 663                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 664                                 "(entryCSN<=%s)", cf.f_av_value.bv_val );
 665                 }
 666                 if ( fop.ors_filterstr.bv_len < 0 || fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 667                         return LDAP_OTHER;
 668                 }
 669                 fop.ors_attrsonly = 1;
 670                 fop.ors_attrs = slap_anlist_no_attrs;
 671                 fop.ors_slimit = 1;
 672                 cb.sc_private = NULL;
 673                 cb.sc_response = findcsn_cb;
 674                 break;
 675         case FIND_PRESENT:
 676                 fop.ors_filter = op->ors_filter;
 677                 fop.ors_filterstr = op->ors_filterstr;
 678                 fop.ors_attrsonly = 0;
 679                 fop.ors_attrs = uuid_anlist;
 680                 fop.ors_slimit = SLAP_NO_LIMIT;
 681                 cb.sc_private = &pcookie;
 682                 cb.sc_response = findpres_cb;
 683                 pcookie.num = 0;
 684
 685                 /* preallocate storage for a full set */
 686                 pcookie.uuids = op->o_tmpalloc( (SLAP_SYNCUUID_SET_SIZE+1) *
 687                         sizeof(struct berval) + SLAP_SYNCUUID_SET_SIZE * UUID_LEN,
 688                         op->o_tmpmemctx );
 689                 pcookie.last = (char *)(pcookie.uuids + SLAP_SYNCUUID_SET_SIZE+1);
 690                 pcookie.uuids[0].bv_val = pcookie.last;
 691                 pcookie.uuids[0].bv_len = UUID_LEN;
 692                 for (i=1; i<SLAP_SYNCUUID_SET_SIZE; i++) {
 693                         pcookie.uuids[i].bv_val = pcookie.uuids[i-1].bv_val + UUID_LEN;
 694                         pcookie.uuids[i].bv_len = UUID_LEN;
 695                 }
 696                 break;
 697         }
 698
 699         fop.o_bd->bd_info = on->on_info->oi_orig;
 700         fop.o_bd->be_search( &fop, &frs );
 701         fop.o_bd->bd_info = (BackendInfo *)on;
 702
 703         switch( mode ) {
 704         case FIND_MAXCSN:
 705                 if ( ber_bvcmp( &si->si_ctxcsn[maxid], &maxcsn )) {
 706                         ber_bvreplace( &si->si_ctxcsn[maxid], &maxcsn );
 707                         si->si_numops++;        /* ensure a checkpoint */
 708                 }
 709                 break;
 710         case FIND_CSN:
 711                 /* If matching CSN was not found, invalidate the context. */
 712                 if ( !cb.sc_private ) {
 713                         /* If we didn't find an exact match, then try for <= */
 714                         if ( findcsn_retry ) {
 715                                 findcsn_retry = 0;
 716                                 goto again;
 717                         }
 718                         rc = LDAP_NO_SUCH_OBJECT;
 719                 }
 720                 break;
 721         case FIND_PRESENT:
 722                 op->o_tmpfree( pcookie.uuids, op->o_tmpmemctx );
 723                 break;
 724         }
 725
 726         return rc;
 727 }
 728
 729 static void
 730 syncprov_free_syncop( syncops *so )
 731 {
 732         syncres *sr, *srnext;
 733         GroupAssertion *ga, *gnext;
 734
 735         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 736         if ( --so->s_inuse > 0 ) {
 737                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 738                 return;
 739         }
 740         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 741         if ( so->s_flags & PS_IS_DETACHED ) {
 742                 filter_free( so->s_op->ors_filter );
 743                 for ( ga = so->s_op->o_groups; ga; ga=gnext ) {
 744                         gnext = ga->ga_next;
 745                         ch_free( ga );
 746                 }
 747                 ch_free( so->s_op );
 748         }
 749         ch_free( so->s_base.bv_val );
 750         for ( sr=so->s_res; sr; sr=srnext ) {
 751                 srnext = sr->s_next;
 752                 ch_free( sr );
 753         }
 754         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 755         ch_free( so );
 756 }
 757
 758 /* Send a persistent search response */
 759 static int
 760 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so,
 761         Entry **e, int mode )
 762 {
 763         slap_overinst *on = opc->son;
 764
 765         SlapReply rs = { REP_SEARCH };
 766         LDAPControl *ctrls[2];
 767         struct berval cookie, csns[2];
 768         Entry e_uuid = {0};
 769         Attribute a_uuid = {0};
 770
 771         if ( so->s_op->o_abandon )
 772                 return SLAPD_ABANDON;
 773
 774         ctrls[1] = NULL;
 775         csns[0] = opc->sctxcsn;
 776         BER_BVZERO( &csns[1] );
 777         slap_compose_sync_cookie( op, &cookie, csns, so->s_rid, so->s_sid );
 778
 779         Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: cookie=%s\n", cookie.bv_val, 0, 0 );
 780
 781         e_uuid.e_attrs = &a_uuid;
 782         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 783         a_uuid.a_nvals = &opc->suuid;
 784         rs.sr_err = syncprov_state_ctrl( op, &rs, &e_uuid,
 785                 mode, ctrls, 0, 1, &cookie );
 786         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
 787
 788         rs.sr_ctrls = ctrls;
 789         op->o_bd->bd_info = (BackendInfo *)on->on_info;
 790         switch( mode ) {
 791         case LDAP_SYNC_ADD:
 792                 rs.sr_entry = *e;
 793                 if ( rs.sr_entry->e_private )
 794                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 795                 if ( opc->sreference ) {
 796                         rs.sr_ref = get_entry_referrals( op, rs.sr_entry );
 797                         rs.sr_err = send_search_reference( op, &rs );
 798                         ber_bvarray_free( rs.sr_ref );
 799                         if ( !rs.sr_entry )
 800                                 *e = NULL;
 801                         break;
 802                 }
 803                 /* fallthru */
 804         case LDAP_SYNC_MODIFY:
 805                 rs.sr_entry = *e;
 806                 if ( rs.sr_entry->e_private )
 807                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 808                 rs.sr_attrs = op->ors_attrs;
 809                 rs.sr_err = send_search_entry( op, &rs );
 810                 if ( !rs.sr_entry )
 811                         *e = NULL;
 812                 break;
 813         case LDAP_SYNC_DELETE:
 814                 e_uuid.e_attrs = NULL;
 815                 e_uuid.e_name = opc->sdn;
 816                 e_uuid.e_nname = opc->sndn;
 817                 rs.sr_entry = &e_uuid;
 818                 if ( opc->sreference ) {
 819                         struct berval bv = BER_BVNULL;
 820                         rs.sr_ref = &bv;
 821                         rs.sr_err = send_search_reference( op, &rs );
 822                 } else {
 823                         rs.sr_err = send_search_entry( op, &rs );
 824                 }
 825                 break;
 826         default:
 827                 assert(0);
 828         }
 829         /* In case someone else freed it already? */
 830         if ( rs.sr_ctrls ) {
 831                 op->o_tmpfree( rs.sr_ctrls[0], op->o_tmpmemctx );
 832                 rs.sr_ctrls = NULL;
 833         }
 834
 835         return rs.sr_err;
 836 }
 837
 838 /* Play back queued responses */
 839 static int
 840 syncprov_qplay( Operation *op, slap_overinst *on, syncops *so )
 841 {
 842         syncres *sr;
 843         Entry *e;
 844         opcookie opc;
 845         int rc = 0;
 846
 847         opc.son = on;
 848
 849         for (;;) {
 850                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 851                 sr = so->s_res;
 852                 if ( sr )
 853                         so->s_res = sr->s_next;
 854                 if ( !so->s_res )
 855                         so->s_restail = NULL;
 856                 /* Exit loop with mutex held */
 857                 if ( !sr || so->s_op->o_abandon )
 858                         break;
 859                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 860
 861                 opc.sdn = sr->s_dn;
 862                 opc.sndn = sr->s_ndn;
 863                 opc.suuid = sr->s_uuid;
 864                 opc.sctxcsn = sr->s_csn;
 865                 opc.sreference = sr->s_isreference;
 866                 e = NULL;
 867
 868                 if ( sr->s_mode != LDAP_SYNC_DELETE ) {
 869                         rc = overlay_entry_get_ov( op, &opc.sndn, NULL, NULL, 0, &e, on );
 870                         if ( rc ) {
 871                                 Debug( LDAP_DEBUG_SYNC, "syncprov_qplay: failed to get %s, "
 872                                         "error (%d), ignoring...\n", opc.sndn.bv_val, rc, 0 );
 873                                 ch_free( sr );
 874                                 rc = 0;
 875                                 continue;
 876                         }
 877                 }
 878                 rc = syncprov_sendresp( op, &opc, so, &e, sr->s_mode );
 879
 880                 if ( e ) {
 881                         overlay_entry_release_ov( op, e, 0, on );
 882                 }
 883
 884                 ch_free( sr );
 885
 886                 if ( rc ) {
 887                         /* Exit loop with mutex held */
 888                         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 889                         break;
 890                 }
 891         }
 892
 893         /* wait until we get explicitly scheduled again */
 894         ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
 895         ldap_pvt_runqueue_stoptask( &slapd_rq, rtask );
 896         if ( rc == 0 ) {
 897                 ldap_pvt_runqueue_resched( &slapd_rq, rtask, 1 );
 898         } else {
 899                 /* bail out on any error */
 900                 ldap_pvt_runqueue_remove( &slapd_rq, rtask );
 901         }
 902         ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
 903         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 904         return rc;
 905 }
 906
 907 /* runqueue task for playing back queued responses */
 908 static void *
 909 syncprov_qtask( void *ctx, void *arg )
 910 {
 911         struct re_s *rtask = arg;
 912         syncops *so = rtask->arg;
 913         slap_overinst *on = so->s_op->o_private;
 914         OperationBuffer opbuf;
 915         Operation *op;
 916         BackendDB be;
 917         int rc;
 918
 919         op = &opbuf.ob_op;
 920         *op = *so->s_op;
 921         op->o_hdr = &opbuf.ob_hdr;
 922         op->o_controls = opbuf.ob_controls;
 923         memset( op->o_controls, 0, sizeof(opbuf.ob_controls) );
 924
 925         *op->o_hdr = *so->s_op->o_hdr;
 926
 927         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx, 1);
 928         op->o_tmpmfuncs = &slap_sl_mfuncs;
 929         op->o_threadctx = ctx;
 930
 931         /* syncprov_qplay expects a fake db */
 932         be = *so->s_op->o_bd;
 933         be.be_flags |= SLAP_DBFLAG_OVERLAY;
 934         op->o_bd = &be;
 935         op->o_private = NULL;
 936         op->o_callback = NULL;
 937
 938         rc = syncprov_qplay( op, on, so );
 939
 940         /* decrement use count... */
 941         syncprov_free_syncop( so );
 942
 943 #if 0   /* FIXME: connection_close isn't exported from slapd.
 944                  * should it be?
 945                  */
 946         if ( rc ) {
 947                 ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
 948                 if ( connection_state_closing( op->o_conn )) {
 949                         connection_close( op->o_conn );
 950                 }
 951                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
 952         }
 953 #endif
 954         return NULL;
 955 }
 956
 957 /* Start the task to play back queued psearch responses */
 958 static void
 959 syncprov_qstart( syncops *so )
 960 {
 961         int wake=0;
 962         ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
 963         if ( !so->s_qtask ) {
 964                 so->s_qtask = ldap_pvt_runqueue_insert( &slapd_rq, RUNQ_INTERVAL,
 965                         syncprov_qtask, so, "syncprov_qtask",
 966                         so->s_op->o_conn->c_peer_name.bv_val );
 967                 ++so->s_inuse;
 968                 wake = 1;
 969         } else {
 970                 if (!ldap_pvt_runqueue_isrunning( &slapd_rq, so->s_qtask ) &&
 971                         !so->s_qtask->next_sched.tv_sec ) {
 972                         so->s_qtask->interval.tv_sec = 0;
 973                         ldap_pvt_runqueue_resched( &slapd_rq, so->s_qtask, 0 );
 974                         so->s_qtask->interval.tv_sec = RUNQ_INTERVAL;
 975                         ++so->s_inuse;
 976                         wake = 1;
 977                 }
 978         }
 979         ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
 980         if ( wake )
 981                 slap_wake_listener();
 982 }
 983
 984 /* Queue a persistent search response */
 985 static int
 986 syncprov_qresp( opcookie *opc, syncops *so, int mode )
 987 {
 988         syncres *sr;
 989         int sid, srsize;
 990
 991         /* Don't send changes back to their originator */
 992         sid = slap_parse_csn_sid( &opc->sctxcsn );
 993         if ( sid >= 0 && sid == so->s_sid )
 994                 return LDAP_SUCCESS;
 995
 996         srsize = sizeof(syncres) + opc->suuid.bv_len + 1 +
 997                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1;
 998         if ( opc->sctxcsn.bv_len )
 999                 srsize += opc->sctxcsn.bv_len + 1;
1000         sr = ch_malloc( srsize );
1001         sr->s_next = NULL;
1002         sr->s_dn.bv_val = (char *)(sr + 1);
1003         sr->s_dn.bv_len = opc->sdn.bv_len;
1004         sr->s_mode = mode;
1005         sr->s_isreference = opc->sreference;
1006         sr->s_ndn.bv_val = lutil_strcopy( sr->s_dn.bv_val,
1007                  opc->sdn.bv_val ) + 1;
1008         sr->s_ndn.bv_len = opc->sndn.bv_len;
1009         sr->s_uuid.bv_val = lutil_strcopy( sr->s_ndn.bv_val,
1010                  opc->sndn.bv_val ) + 1;
1011         sr->s_uuid.bv_len = opc->suuid.bv_len;
1012         AC_MEMCPY( sr->s_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1013         if ( opc->sctxcsn.bv_len ) {
1014                 sr->s_csn.bv_val = sr->s_uuid.bv_val + sr->s_uuid.bv_len + 1;
1015                 strcpy( sr->s_csn.bv_val, opc->sctxcsn.bv_val );
1016         } else {
1017                 sr->s_csn.bv_val = NULL;
1018         }
1019         sr->s_csn.bv_len = opc->sctxcsn.bv_len;
1020
1021         ldap_pvt_thread_mutex_lock( &so->s_mutex );
1022         if ( !so->s_res ) {
1023                 so->s_res = sr;
1024         } else {
1025                 so->s_restail->s_next = sr;
1026         }
1027         so->s_restail = sr;
1028
1029         /* If the base of the psearch was modified, check it next time round */
1030         if ( so->s_flags & PS_WROTE_BASE ) {
1031                 so->s_flags ^= PS_WROTE_BASE;
1032                 so->s_flags |= PS_FIND_BASE;
1033         }
1034         if ( so->s_flags & PS_IS_DETACHED ) {
1035                 syncprov_qstart( so );
1036         }
1037         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
1038         return LDAP_SUCCESS;
1039 }
1040
1041 static int
1042 syncprov_drop_psearch( syncops *so, int lock )
1043 {
1044         if ( so->s_flags & PS_IS_DETACHED ) {
1045                 if ( lock )
1046                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
1047                 so->s_op->o_conn->c_n_ops_executing--;
1048                 so->s_op->o_conn->c_n_ops_completed++;
1049                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, Operation,
1050                         o_next );
1051                 if ( lock )
1052                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
1053         }
1054         syncprov_free_syncop( so );
1055
1056         return 0;
1057 }
1058
1059 static int
1060 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
1061 {
1062         slap_callback *sc = op->o_callback;
1063         op->o_callback = sc->sc_next;
1064         syncprov_drop_psearch( op->o_callback->sc_private, 0 );
1065         op->o_tmpfree( sc, op->o_tmpmemctx );
1066         return 0;
1067 }
1068
1069 static int
1070 syncprov_op_abandon( Operation *op, SlapReply *rs )
1071 {
1072         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1073         syncprov_info_t         *si = on->on_bi.bi_private;
1074         syncops *so, *soprev;
1075
1076         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1077         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
1078                 soprev=so, so=so->s_next ) {
1079                 if ( so->s_op->o_connid == op->o_connid &&
1080                         so->s_op->o_msgid == op->orn_msgid ) {
1081                                 so->s_op->o_abandon = 1;
1082                                 soprev->s_next = so->s_next;
1083                                 break;
1084                 }
1085         }
1086         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1087         if ( so ) {
1088                 /* Is this really a Cancel exop? */
1089                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
1090                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
1091                         rs->sr_err = LDAP_CANCELLED;
1092                         send_ldap_result( so->s_op, rs );
1093                         if ( so->s_flags & PS_IS_DETACHED ) {
1094                                 slap_callback *cb;
1095                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
1096                                 cb->sc_cleanup = syncprov_ab_cleanup;
1097                                 cb->sc_next = op->o_callback;
1098                                 cb->sc_private = so;
1099                                 return SLAP_CB_CONTINUE;
1100                         }
1101                 }
1102                 syncprov_drop_psearch( so, 0 );
1103         }
1104         return SLAP_CB_CONTINUE;
1105 }
1106
1107 /* Find which persistent searches are affected by this operation */
1108 static void
1109 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
1110 {
1111         slap_overinst *on = opc->son;
1112         syncprov_info_t         *si = on->on_bi.bi_private;
1113
1114         fbase_cookie fc;
1115         syncops *ss, *sprev, *snext;
1116         Entry *e = NULL;
1117         Attribute *a;
1118         int rc;
1119         struct berval newdn;
1120         int freefdn = 0;
1121         BackendDB *b0 = op->o_bd, db;
1122
1123         fc.fdn = &op->o_req_ndn;
1124         /* compute new DN */
1125         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1126                 struct berval pdn;
1127                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
1128                 else dnParent( fc.fdn, &pdn );
1129                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
1130                 fc.fdn = &newdn;
1131                 freefdn = 1;
1132         }
1133         if ( op->o_tag != LDAP_REQ_ADD ) {
1134                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1135                         db = *op->o_bd;
1136                         op->o_bd = &db;
1137                 }
1138                 rc = overlay_entry_get_ov( op, fc.fdn, NULL, NULL, 0, &e, on );
1139                 /* If we're sending responses now, make a copy and unlock the DB */
1140                 if ( e && !saveit ) {
1141                         Entry *e2 = entry_dup( e );
1142                         overlay_entry_release_ov( op, e, 0, on );
1143                         e = e2;
1144                 }
1145                 if ( rc ) {
1146                         op->o_bd = b0;
1147                         return;
1148                 }
1149         } else {
1150                 e = op->ora_e;
1151         }
1152
1153         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1154                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1155                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1156                 opc->sreference = is_entry_referral( e );
1157                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1158                 if ( a )
1159                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1160         } else if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1161                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1162                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1163                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1164                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1165         }
1166
1167         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1168         for (ss = si->si_ops, sprev = (syncops *)&si->si_ops; ss;
1169                 sprev = ss, ss=snext)
1170         {
1171                 syncmatches *sm;
1172                 int found = 0;
1173
1174                 snext = ss->s_next;
1175                 /* validate base */
1176                 fc.fss = ss;
1177                 fc.fbase = 0;
1178                 fc.fscope = 0;
1179
1180                 /* If the base of the search is missing, signal a refresh */
1181                 rc = syncprov_findbase( op, &fc );
1182                 if ( rc != LDAP_SUCCESS ) {
1183                         SlapReply rs = {REP_RESULT};
1184                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1185                                 "search base has changed" );
1186                         sprev->s_next = snext;
1187                         syncprov_drop_psearch( ss, 1 );
1188                         ss = sprev;
1189                         continue;
1190                 }
1191
1192
1193                 /* If we're sending results now, look for this op in old matches */
1194                 if ( !saveit ) {
1195                         syncmatches *old;
1196
1197                         /* Did we modify the search base? */
1198                         if ( dn_match( &op->o_req_ndn, &ss->s_base )) {
1199                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1200                                 ss->s_flags |= PS_WROTE_BASE;
1201                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1202                         }
1203
1204                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1205                                 old=sm, sm=sm->sm_next ) {
1206                                 if ( sm->sm_op == ss ) {
1207                                         found = 1;
1208                                         old->sm_next = sm->sm_next;
1209                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1210                                         break;
1211                                 }
1212                         }
1213                 }
1214
1215                 /* check if current o_req_dn is in scope and matches filter */
1216                 if ( fc.fscope && test_filter( op, e, ss->s_op->ors_filter ) ==
1217                         LDAP_COMPARE_TRUE ) {
1218                         if ( saveit ) {
1219                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1220                                 sm->sm_next = opc->smatches;
1221                                 sm->sm_op = ss;
1222                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1223                                 ++ss->s_inuse;
1224                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1225                                 opc->smatches = sm;
1226                         } else {
1227                                 /* if found send UPDATE else send ADD */
1228                                 syncprov_qresp( opc, ss,
1229                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD );
1230                         }
1231                 } else if ( !saveit && found ) {
1232                         /* send DELETE */
1233                         syncprov_qresp( opc, ss, LDAP_SYNC_DELETE );
1234                 }
1235         }
1236         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1237
1238         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1239                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1240                         op->o_bd = &db;
1241                 }
1242                 overlay_entry_release_ov( op, e, 0, on );
1243                 op->o_bd = b0;
1244         }
1245         if ( freefdn ) {
1246                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1247         }
1248         op->o_bd = b0;
1249 }
1250
1251 static int
1252 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1253 {
1254         slap_callback *cb = op->o_callback;
1255         opcookie *opc = cb->sc_private;
1256         slap_overinst *on = opc->son;
1257         syncprov_info_t         *si = on->on_bi.bi_private;
1258         syncmatches *sm, *snext;
1259         modtarget *mt, mtdummy;
1260
1261         for (sm = opc->smatches; sm; sm=snext) {
1262                 snext = sm->sm_next;
1263                 syncprov_free_syncop( sm->sm_op );
1264                 op->o_tmpfree( sm, op->o_tmpmemctx );
1265         }
1266
1267         /* Remove op from lock table */
1268         mtdummy.mt_op = op;
1269         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1270         mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1271         if ( mt ) {
1272                 modinst *mi = mt->mt_mods;
1273
1274                 /* If there are more, promote the next one */
1275                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1276                 if ( mi->mi_next ) {
1277                         mt->mt_mods = mi->mi_next;
1278                         mt->mt_op = mt->mt_mods->mi_op;
1279                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1280                 } else {
1281                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1282                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1283                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1284                         ch_free( mt );
1285                 }
1286         }
1287         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1288         if ( !BER_BVISNULL( &opc->suuid ))
1289                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1290         if ( !BER_BVISNULL( &opc->sndn ))
1291                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1292         if ( !BER_BVISNULL( &opc->sdn ))
1293                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1294         op->o_callback = cb->sc_next;
1295         op->o_tmpfree(cb, op->o_tmpmemctx);
1296
1297         return 0;
1298 }
1299
1300 static void
1301 syncprov_checkpoint( Operation *op, SlapReply *rs, slap_overinst *on )
1302 {
1303         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
1304         Modifications mod;
1305         Operation opm;
1306         SlapReply rsm = { 0 };
1307         slap_callback cb = {0};
1308
1309         mod.sml_numvals = si->si_numcsns;
1310         mod.sml_values = si->si_ctxcsn;
1311         mod.sml_nvalues = NULL;
1312         mod.sml_desc = slap_schema.si_ad_contextCSN;
1313         mod.sml_op = LDAP_MOD_REPLACE;
1314         mod.sml_flags = 0;
1315         mod.sml_next = NULL;
1316
1317         cb.sc_response = slap_null_cb;
1318         opm = *op;
1319         opm.o_tag = LDAP_REQ_MODIFY;
1320         opm.o_callback = &cb;
1321         opm.orm_modlist = &mod;
1322         opm.orm_no_opattrs = 1;
1323         opm.o_req_dn = op->o_bd->be_suffix[0];
1324         opm.o_req_ndn = op->o_bd->be_nsuffix[0];
1325         opm.o_bd->bd_info = on->on_info->oi_orig;
1326         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1327         opm.o_no_schema_check = 1;
1328         opm.o_bd->be_modify( &opm, &rsm );
1329         if ( mod.sml_next != NULL ) {
1330                 slap_mods_free( mod.sml_next, 1 );
1331         }
1332         opm.orm_no_opattrs = 0;
1333 }
1334
1335 static void
1336 syncprov_add_slog( Operation *op )
1337 {
1338         opcookie *opc = op->o_callback->sc_private;
1339         slap_overinst *on = opc->son;
1340         syncprov_info_t         *si = on->on_bi.bi_private;
1341         sessionlog *sl;
1342         slog_entry *se;
1343
1344         sl = si->si_logs;
1345         {
1346                 /* Allocate a record. UUIDs are not NUL-terminated. */
1347                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1348                         op->o_csn.bv_len + 1 );
1349                 se->se_next = NULL;
1350                 se->se_tag = op->o_tag;
1351
1352                 se->se_uuid.bv_val = (char *)(&se[1]);
1353                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1354                 se->se_uuid.bv_len = opc->suuid.bv_len;
1355
1356                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1357                 AC_MEMCPY( se->se_csn.bv_val, op->o_csn.bv_val, op->o_csn.bv_len );
1358                 se->se_csn.bv_val[op->o_csn.bv_len] = '\0';
1359                 se->se_csn.bv_len = op->o_csn.bv_len;
1360                 se->se_sid = slap_parse_csn_sid( &se->se_csn );
1361
1362                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1363                 if ( sl->sl_head ) {
1364                         sl->sl_tail->se_next = se;
1365                 } else {
1366                         sl->sl_head = se;
1367                 }
1368                 sl->sl_tail = se;
1369                 sl->sl_num++;
1370                 while ( sl->sl_num > sl->sl_size ) {
1371                         se = sl->sl_head;
1372                         sl->sl_head = se->se_next;
1373                         strcpy( sl->sl_mincsn.bv_val, se->se_csn.bv_val );
1374                         sl->sl_mincsn.bv_len = se->se_csn.bv_len;
1375                         ch_free( se );
1376                         sl->sl_num--;
1377                 }
1378                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1379         }
1380 }
1381
1382 /* Just set a flag if we found the matching entry */
1383 static int
1384 playlog_cb( Operation *op, SlapReply *rs )
1385 {
1386         if ( rs->sr_type == REP_SEARCH ) {
1387                 op->o_callback->sc_private = (void *)1;
1388         }
1389         return rs->sr_err;
1390 }
1391
1392 /* enter with sl->sl_mutex locked, release before returning */
1393 static void
1394 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1395         sync_control *srs, BerVarray ctxcsn, int numcsns, int *sids )
1396 {
1397         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1398         slog_entry *se;
1399         int i, j, ndel, num, nmods, mmods;
1400         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1401         BerVarray uuids;
1402         struct berval delcsn[2];
1403
1404         if ( !sl->sl_num ) {
1405                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1406                 return;
1407         }
1408
1409         num = sl->sl_num;
1410         i = 0;
1411         nmods = 0;
1412
1413         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1414                 num * UUID_LEN, op->o_tmpmemctx );
1415         uuids[0].bv_val = (char *)(uuids + num + 1);
1416
1417         delcsn[0].bv_len = 0;
1418         delcsn[0].bv_val = cbuf;
1419         BER_BVZERO(&delcsn[1]);
1420
1421         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1422          * and everything else at the end. Do this first so we can
1423          * unlock the list mutex.
1424          */
1425         Debug( LDAP_DEBUG_SYNC, "srs csn %s\n",
1426                 srs->sr_state.ctxcsn[0].bv_val, 0, 0 );
1427         for ( se=sl->sl_head; se; se=se->se_next ) {
1428                 int k;
1429                 Debug( LDAP_DEBUG_SYNC, "log csn %s\n", se->se_csn.bv_val, 0, 0 );
1430                 ndel = 1;
1431                 for ( k=0; k<srs->sr_state.numcsns; k++ ) {
1432                         if ( se->se_sid == srs->sr_state.sids[k] ) {
1433                                 ndel = ber_bvcmp( &se->se_csn, &srs->sr_state.ctxcsn[k] );
1434                                 break;
1435                         }
1436                 }
1437                 if ( ndel <= 0 ) {
1438                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too old\n", ndel, 0, 0 );
1439                         continue;
1440                 }
1441                 ndel = 0;
1442                 for ( k=0; k<numcsns; k++ ) {
1443                         if ( se->se_sid == sids[k] ) {
1444                                 ndel = ber_bvcmp( &se->se_csn, &ctxcsn[k] );
1445                                 break;
1446                         }
1447                 }
1448                 if ( ndel > 0 ) {
1449                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too new\n", ndel, 0, 0 );
1450                         break;
1451                 }
1452                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1453                         j = i;
1454                         i++;
1455                         AC_MEMCPY( cbuf, se->se_csn.bv_val, se->se_csn.bv_len );
1456                         delcsn[0].bv_len = se->se_csn.bv_len;
1457                         delcsn[0].bv_val[delcsn[0].bv_len] = '\0';
1458                 } else {
1459                         nmods++;
1460                         j = num - nmods;
1461                 }
1462                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1463                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1464                 uuids[j].bv_len = UUID_LEN;
1465         }
1466         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1467
1468         ndel = i;
1469
1470         /* Zero out unused slots */
1471         for ( i=ndel; i < num - nmods; i++ )
1472                 uuids[i].bv_len = 0;
1473
1474         /* Mods must be validated to see if they belong in this delete set.
1475          */
1476
1477         mmods = nmods;
1478         /* Strip any duplicates */
1479         for ( i=0; i<nmods; i++ ) {
1480                 for ( j=0; j<ndel; j++ ) {
1481                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1482                                 uuids[num - 1 - i].bv_len = 0;
1483                                 mmods --;
1484                                 break;
1485                         }
1486                 }
1487                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1488                 for ( j=0; j<i; j++ ) {
1489                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1490                                 uuids[num - 1 - i].bv_len = 0;
1491                                 mmods --;
1492                                 break;
1493                         }
1494                 }
1495         }
1496
1497         if ( mmods ) {
1498                 Operation fop;
1499                 SlapReply frs = { REP_RESULT };
1500                 int rc;
1501                 Filter mf, af;
1502                 AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
1503                 slap_callback cb = {0};
1504
1505                 fop = *op;
1506
1507                 fop.o_sync_mode = 0;
1508                 fop.o_callback = &cb;
1509                 fop.ors_limit = NULL;
1510                 fop.ors_tlimit = SLAP_NO_LIMIT;
1511                 fop.ors_attrs = slap_anlist_all_attributes;
1512                 fop.ors_attrsonly = 0;
1513                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1514
1515                 af.f_choice = LDAP_FILTER_AND;
1516                 af.f_next = NULL;
1517                 af.f_and = &mf;
1518                 mf.f_choice = LDAP_FILTER_EQUALITY;
1519                 mf.f_ava = &eq;
1520                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1521                 mf.f_next = fop.ors_filter;
1522
1523                 fop.ors_filter = &af;
1524
1525                 cb.sc_response = playlog_cb;
1526                 fop.o_bd->bd_info = on->on_info->oi_orig;
1527
1528                 for ( i=ndel; i<num; i++ ) {
1529                         if ( uuids[i].bv_len == 0 ) continue;
1530
1531                         mf.f_av_value = uuids[i];
1532                         cb.sc_private = NULL;
1533                         fop.ors_slimit = 1;
1534                         frs.sr_nentries = 0;
1535                         rc = fop.o_bd->be_search( &fop, &frs );
1536
1537                         /* If entry was not found, add to delete list */
1538                         if ( !cb.sc_private ) {
1539                                 uuids[ndel++] = uuids[i];
1540                         }
1541                 }
1542                 fop.o_bd->bd_info = (BackendInfo *)on;
1543         }
1544         if ( ndel ) {
1545                 struct berval cookie;
1546
1547                 slap_compose_sync_cookie( op, &cookie, delcsn, srs->sr_state.rid,
1548                         srs->sr_state.sid );
1549
1550                 Debug( LDAP_DEBUG_SYNC, "syncprov_playlog: cookie=%s\n", cookie.bv_val, 0, 0 );
1551
1552                 uuids[ndel].bv_val = NULL;
1553                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, &cookie, 0, uuids, 1 );
1554                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1555         }
1556         op->o_tmpfree( uuids, op->o_tmpmemctx );
1557 }
1558
1559 static int
1560 syncprov_op_response( Operation *op, SlapReply *rs )
1561 {
1562         opcookie *opc = op->o_callback->sc_private;
1563         slap_overinst *on = opc->son;
1564         syncprov_info_t         *si = on->on_bi.bi_private;
1565         syncmatches *sm;
1566
1567         if ( rs->sr_err == LDAP_SUCCESS )
1568         {
1569                 struct berval maxcsn = BER_BVNULL;
1570                 char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1571                 int do_check = 0, have_psearches;
1572
1573                 /* Update our context CSN */
1574                 cbuf[0] = '\0';
1575                 ldap_pvt_thread_rdwr_wlock( &si->si_csn_rwlock );
1576                 slap_get_commit_csn( op, &maxcsn );
1577                 if ( !BER_BVISNULL( &maxcsn ) ) {
1578                         int i, sid;
1579                         strcpy( cbuf, maxcsn.bv_val );
1580                         sid = slap_parse_csn_sid( &maxcsn );
1581                         for ( i=0; i<si->si_numcsns; i++ ) {
1582                                 if ( sid == si->si_sids[i] ) {
1583                                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn[i] ) > 0 ) {
1584                                                 ber_bvreplace( &si->si_ctxcsn[i], &maxcsn );
1585                                         }
1586                                         break;
1587                                 }
1588                         }
1589                         /* It's a new SID for us */
1590                         if ( i == si->si_numcsns ) {
1591                                 value_add_one( &si->si_ctxcsn, &maxcsn );
1592                                 si->si_numcsns++;
1593                                 si->si_sids = ch_realloc( si->si_sids, si->si_numcsns *
1594                                         sizeof(int));
1595                                 si->si_sids[i] = sid;
1596                         }
1597                 }
1598
1599                 /* Don't do any processing for consumer contextCSN updates */
1600                 if ( SLAP_SYNC_SHADOW( op->o_bd ) &&
1601                         op->o_msgid == SLAP_SYNC_UPDATE_MSGID ) {
1602                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1603                         return SLAP_CB_CONTINUE;
1604                 }
1605
1606                 si->si_numops++;
1607                 if ( si->si_chkops || si->si_chktime ) {
1608                         if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1609                                 do_check = 1;
1610                                 si->si_numops = 0;
1611                         }
1612                         if ( si->si_chktime &&
1613                                 (op->o_time - si->si_chklast >= si->si_chktime )) {
1614                                 if ( si->si_chklast ) {
1615                                         do_check = 1;
1616                                         si->si_chklast = op->o_time;
1617                                 } else {
1618                                         si->si_chklast = 1;
1619                                 }
1620                         }
1621                 }
1622                 ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1623
1624                 if ( do_check ) {
1625                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1626                         syncprov_checkpoint( op, rs, on );
1627                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1628                 }
1629
1630                 opc->sctxcsn.bv_len = maxcsn.bv_len;
1631                 opc->sctxcsn.bv_val = cbuf;
1632
1633                 /* Handle any persistent searches */
1634                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1635                 have_psearches = ( si->si_ops != NULL );
1636                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1637                 if ( have_psearches ) {
1638                         switch(op->o_tag) {
1639                         case LDAP_REQ_ADD:
1640                         case LDAP_REQ_MODIFY:
1641                         case LDAP_REQ_MODRDN:
1642                         case LDAP_REQ_EXTENDED:
1643                                 syncprov_matchops( op, opc, 0 );
1644                                 break;
1645                         case LDAP_REQ_DELETE:
1646                                 /* for each match in opc->smatches:
1647                                  *   send DELETE msg
1648                                  */
1649                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1650                                         if ( sm->sm_op->s_op->o_abandon )
1651                                                 continue;
1652                                         syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_DELETE );
1653                                 }
1654                                 break;
1655                         }
1656                 }
1657
1658                 /* Add any log records */
1659                 if ( si->si_logs && op->o_tag != LDAP_REQ_ADD ) {
1660                         syncprov_add_slog( op );
1661                 }
1662
1663         }
1664         return SLAP_CB_CONTINUE;
1665 }
1666
1667 /* We don't use a subentry to store the context CSN any more.
1668  * We expose the current context CSN as an operational attribute
1669  * of the suffix entry.
1670  */
1671 static int
1672 syncprov_op_compare( Operation *op, SlapReply *rs )
1673 {
1674         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1675         syncprov_info_t         *si = on->on_bi.bi_private;
1676         int rc = SLAP_CB_CONTINUE;
1677
1678         if ( dn_match( &op->o_req_ndn, op->o_bd->be_nsuffix ) &&
1679                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1680         {
1681                 Entry e = {0};
1682                 Attribute a = {0};
1683
1684                 e.e_name = op->o_bd->be_suffix[0];
1685                 e.e_nname = op->o_bd->be_nsuffix[0];
1686                 e.e_attrs = &a;
1687
1688                 a.a_desc = slap_schema.si_ad_contextCSN;
1689
1690                 ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1691
1692                 a.a_vals = si->si_ctxcsn;
1693                 a.a_nvals = a.a_vals;
1694
1695                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1696                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1697                 if ( ! rs->sr_err ) {
1698                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1699                         goto return_results;
1700                 }
1701
1702                 if ( get_assert( op ) &&
1703                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
1704                 {
1705                         rs->sr_err = LDAP_ASSERTION_FAILED;
1706                         goto return_results;
1707                 }
1708
1709
1710                 rs->sr_err = LDAP_COMPARE_FALSE;
1711
1712                 if ( attr_valfind( &a,
1713                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
1714                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
1715                                 &op->oq_compare.rs_ava->aa_value, NULL, op->o_tmpmemctx ) == 0 )
1716                 {
1717                         rs->sr_err = LDAP_COMPARE_TRUE;
1718                 }
1719
1720 return_results:;
1721
1722                 ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1723
1724                 send_ldap_result( op, rs );
1725
1726                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
1727                         rs->sr_err = LDAP_SUCCESS;
1728                 }
1729                 rc = rs->sr_err;
1730         }
1731
1732         return rc;
1733 }
1734
1735 static int
1736 syncprov_op_mod( Operation *op, SlapReply *rs )
1737 {
1738         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1739         syncprov_info_t         *si = on->on_bi.bi_private;
1740         slap_callback *cb;
1741         opcookie *opc;
1742         int have_psearches, cbsize;
1743
1744         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1745         have_psearches = ( si->si_ops != NULL );
1746         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1747
1748         cbsize = sizeof(slap_callback) + sizeof(opcookie) +
1749                 (have_psearches ? sizeof(modinst) : 0 );
1750
1751         cb = op->o_tmpcalloc(1, cbsize, op->o_tmpmemctx);
1752         opc = (opcookie *)(cb+1);
1753         opc->son = on;
1754         cb->sc_response = syncprov_op_response;
1755         cb->sc_cleanup = syncprov_op_cleanup;
1756         cb->sc_private = opc;
1757         cb->sc_next = op->o_callback;
1758         op->o_callback = cb;
1759
1760         /* If there are active persistent searches, lock this operation.
1761          * See seqmod.c for the locking logic on its own.
1762          */
1763         if ( have_psearches ) {
1764                 modtarget *mt, mtdummy;
1765                 modinst *mi;
1766
1767                 mi = (modinst *)(opc+1);
1768                 mi->mi_op = op;
1769
1770                 /* See if we're already modifying this entry... */
1771                 mtdummy.mt_op = op;
1772                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1773                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1774                 if ( mt ) {
1775                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1776                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1777                         mt->mt_tail->mi_next = mi;
1778                         mt->mt_tail = mi;
1779                         /* wait for this op to get to head of list */
1780                         while ( mt->mt_mods != mi ) {
1781                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1782                                 ldap_pvt_thread_yield();
1783                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1784
1785                                 /* clean up if the caller is giving up */
1786                                 if ( op->o_abandon ) {
1787                                         modinst *m2;
1788                                         for ( m2 = mt->mt_mods; m2->mi_next != mi;
1789                                                 m2 = m2->mi_next );
1790                                         m2->mi_next = mi->mi_next;
1791                                         if ( mt->mt_tail == mi ) mt->mt_tail = m2;
1792                                         op->o_tmpfree( cb, op->o_tmpmemctx );
1793                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1794                                         return SLAPD_ABANDON;
1795                                 }
1796                         }
1797                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1798                 } else {
1799                         /* Record that we're modifying this entry now */
1800                         mt = ch_malloc( sizeof(modtarget) );
1801                         mt->mt_mods = mi;
1802                         mt->mt_tail = mi;
1803                         mt->mt_op = mi->mi_op;
1804                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
1805                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
1806                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1807                 }
1808         }
1809
1810         if (( have_psearches || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
1811                 syncprov_matchops( op, opc, 1 );
1812
1813         return SLAP_CB_CONTINUE;
1814 }
1815
1816 static int
1817 syncprov_op_extended( Operation *op, SlapReply *rs )
1818 {
1819         if ( exop_is_write( op ))
1820                 return syncprov_op_mod( op, rs );
1821
1822         return SLAP_CB_CONTINUE;
1823 }
1824
1825 typedef struct searchstate {
1826         slap_overinst *ss_on;
1827         syncops *ss_so;
1828         BerVarray ss_ctxcsn;
1829         int *ss_sids;
1830         int ss_numcsns;
1831 #define SS_PRESENT      0x01
1832 #define SS_CHANGED      0x02
1833         int ss_flags;
1834 } searchstate;
1835
1836 static int
1837 syncprov_search_cleanup( Operation *op, SlapReply *rs )
1838 {
1839         if ( rs->sr_ctrls ) {
1840                 op->o_tmpfree( rs->sr_ctrls[0], op->o_tmpmemctx );
1841                 op->o_tmpfree( rs->sr_ctrls, op->o_tmpmemctx );
1842                 rs->sr_ctrls = NULL;
1843         }
1844         return 0;
1845 }
1846
1847 typedef struct SyncOperationBuffer {
1848         Operation               sob_op;
1849         Opheader                sob_hdr;
1850         AttributeName   sob_extra;      /* not always present */
1851         /* Further data allocated here */
1852 } SyncOperationBuffer;
1853
1854 static void
1855 syncprov_detach_op( Operation *op, syncops *so, slap_overinst *on )
1856 {
1857         SyncOperationBuffer *sopbuf2;
1858         Operation *op2;
1859         int i, alen = 0;
1860         size_t size;
1861         char *ptr;
1862         GroupAssertion *g1, *g2;
1863
1864         /* count the search attrs */
1865         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1866                 alen += op->ors_attrs[i].an_name.bv_len + 1;
1867         }
1868         /* Make a new copy of the operation */
1869         size = offsetof( SyncOperationBuffer, sob_extra ) +
1870                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
1871                 op->o_req_dn.bv_len + 1 +
1872                 op->o_req_ndn.bv_len + 1 +
1873                 op->o_ndn.bv_len + 1 +
1874                 so->s_filterstr.bv_len + 1;
1875         sopbuf2 = ch_calloc( 1, size );
1876         op2 = &sopbuf2->sob_op;
1877         op2->o_hdr = &sopbuf2->sob_hdr;
1878
1879         /* Copy the fields we care about explicitly, leave the rest alone */
1880         *op2->o_hdr = *op->o_hdr;
1881         op2->o_tag = op->o_tag;
1882         op2->o_time = op->o_time;
1883         op2->o_bd = on->on_info->oi_origdb;
1884         op2->o_request = op->o_request;
1885         op2->o_private = on;
1886
1887         ptr = (char *) sopbuf2 + offsetof( SyncOperationBuffer, sob_extra );
1888         if ( i ) {
1889                 op2->ors_attrs = (AttributeName *) ptr;
1890                 ptr = (char *) &op2->ors_attrs[i+1];
1891                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1892                         op2->ors_attrs[i] = op->ors_attrs[i];
1893                         op2->ors_attrs[i].an_name.bv_val = ptr;
1894                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
1895                 }
1896                 BER_BVZERO( &op2->ors_attrs[i].an_name );
1897         }
1898
1899         op2->o_authz = op->o_authz;
1900         op2->o_ndn.bv_val = ptr;
1901         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
1902         op2->o_dn = op2->o_ndn;
1903         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
1904         op2->o_req_dn.bv_val = ptr;
1905         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
1906         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
1907         op2->o_req_ndn.bv_val = ptr;
1908         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
1909         op2->ors_filterstr.bv_val = ptr;
1910         strcpy( ptr, so->s_filterstr.bv_val );
1911         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
1912
1913         /* Skip the AND/GE clause that we stuck on in front */
1914         if ( so->s_flags & PS_FIX_FILTER ) {
1915                 op2->ors_filter = op->ors_filter->f_and->f_next;
1916                 so->s_flags ^= PS_FIX_FILTER;
1917         } else {
1918                 op2->ors_filter = op->ors_filter;
1919         }
1920         op2->ors_filter = filter_dup( op2->ors_filter, NULL );
1921         so->s_op = op2;
1922
1923         /* Copy any cached group ACLs individually */
1924         op2->o_groups = NULL;
1925         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
1926                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
1927                 *g2 = *g1;
1928                 strcpy( g2->ga_ndn, g1->ga_ndn );
1929                 g2->ga_next = op2->o_groups;
1930                 op2->o_groups = g2;
1931         }
1932         /* Don't allow any further group caching */
1933         op2->o_do_not_cache = 1;
1934
1935         /* Add op2 to conn so abandon will find us */
1936         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
1937         op->o_conn->c_n_ops_executing++;
1938         op->o_conn->c_n_ops_completed--;
1939         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
1940         so->s_flags |= PS_IS_DETACHED;
1941         ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
1942
1943         /* Prevent anyone else from trying to send a result for this op */
1944         op->o_abandon = 1;
1945 }
1946
1947 static int
1948 syncprov_search_response( Operation *op, SlapReply *rs )
1949 {
1950         searchstate *ss = op->o_callback->sc_private;
1951         slap_overinst *on = ss->ss_on;
1952         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
1953
1954         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
1955                 Attribute *a;
1956                 /* If we got a referral without a referral object, there's
1957                  * something missing that we cannot replicate. Just ignore it.
1958                  * The consumer will abort because we didn't send the expected
1959                  * control.
1960                  */
1961                 if ( !rs->sr_entry ) {
1962                         assert( rs->sr_entry != NULL );
1963                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
1964                         return SLAP_CB_CONTINUE;
1965                 }
1966                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryCSN );
1967                 if ( a == NULL && rs->sr_operational_attrs != NULL ) {
1968                         a = attr_find( rs->sr_operational_attrs, slap_schema.si_ad_entryCSN );
1969                 }
1970                 if ( a ) {
1971                         int i, sid;
1972                         sid = slap_parse_csn_sid( &a->a_nvals[0] );
1973
1974                         /* Don't send changed entries back to the originator */
1975                         if ( sid == srs->sr_state.sid && srs->sr_state.numcsns ) {
1976                                 Debug( LDAP_DEBUG_SYNC,
1977                                         "Entry %s changed by peer, ignored\n",
1978                                         rs->sr_entry->e_name.bv_val, 0, 0 );
1979                                 return LDAP_SUCCESS;
1980                         }
1981
1982                         /* If not a persistent search */
1983                         if ( !ss->ss_so ) {
1984                                 /* Make sure entry is less than the snapshot'd contextCSN */
1985                                 for ( i=0; i<ss->ss_numcsns; i++ ) {
1986                                         if ( sid == ss->ss_sids[i] && ber_bvcmp( &a->a_nvals[0],
1987                                                 &ss->ss_ctxcsn[i] ) > 0 ) {
1988                                                 Debug( LDAP_DEBUG_SYNC,
1989                                                         "Entry %s CSN %s greater than snapshot %s\n",
1990                                                         rs->sr_entry->e_name.bv_val,
1991                                                         a->a_nvals[0].bv_val,
1992                                                         ss->ss_ctxcsn[i].bv_val );
1993                                                 return LDAP_SUCCESS;
1994                                         }
1995                                 }
1996                         }
1997
1998                         /* Don't send old entries twice */
1999                         if ( srs->sr_state.ctxcsn ) {
2000                                 for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2001                                         if ( sid == srs->sr_state.sids[i] &&
2002                                                 ber_bvcmp( &a->a_nvals[0],
2003                                                         &srs->sr_state.ctxcsn[i] )<= 0 ) {
2004                                                 Debug( LDAP_DEBUG_SYNC,
2005                                                         "Entry %s CSN %s older or equal to ctx %s\n",
2006                                                         rs->sr_entry->e_name.bv_val,
2007                                                         a->a_nvals[0].bv_val,
2008                                                         srs->sr_state.ctxcsn[i].bv_val );
2009                                                 return LDAP_SUCCESS;
2010                                         }
2011                                 }
2012                         }
2013                 }
2014                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2015                         op->o_tmpmemctx );
2016                 rs->sr_ctrls[1] = NULL;
2017                 rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2018                         LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
2019         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
2020                 struct berval cookie;
2021
2022                 if ( ss->ss_flags & SS_CHANGED ) {
2023                         slap_compose_sync_cookie( op, &cookie, ss->ss_ctxcsn,
2024                                 srs->sr_state.rid, srs->sr_state.sid );
2025
2026                         Debug( LDAP_DEBUG_SYNC, "syncprov_search_response: cookie=%s\n", cookie.bv_val, 0, 0 );
2027                 }
2028
2029                 /* Is this a regular refresh?
2030                  * Note: refresh never gets here if there were no changes
2031                  */
2032                 if ( !ss->ss_so ) {
2033                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2034                                 op->o_tmpmemctx );
2035                         rs->sr_ctrls[1] = NULL;
2036                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
2037                                 0, 1, &cookie, ( ss->ss_flags & SS_PRESENT ) ?  LDAP_SYNC_REFRESH_PRESENTS :
2038                                         LDAP_SYNC_REFRESH_DELETES );
2039                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2040                 } else {
2041                 /* It's RefreshAndPersist, transition to Persist phase */
2042                         syncprov_sendinfo( op, rs, ( ss->ss_flags & SS_PRESENT ) ?
2043                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
2044                                 ( ss->ss_flags & SS_CHANGED ) ? &cookie : NULL,
2045                                 1, NULL, 0 );
2046                         if ( ss->ss_flags & SS_CHANGED )
2047                                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2048
2049                         /* Detach this Op from frontend control */
2050                         ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
2051
2052                         /* Turn off the refreshing flag */
2053                         ss->ss_so->s_flags ^= PS_IS_REFRESHING;
2054
2055                         syncprov_detach_op( op, ss->ss_so, on );
2056
2057                         /* If there are queued responses, fire them off */
2058                         if ( ss->ss_so->s_res )
2059                                 syncprov_qstart( ss->ss_so );
2060                         ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
2061
2062                         return LDAP_SUCCESS;
2063                 }
2064         }
2065
2066         return SLAP_CB_CONTINUE;
2067 }
2068
2069 static int
2070 syncprov_op_search( Operation *op, SlapReply *rs )
2071 {
2072         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2073         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2074         slap_callback   *cb;
2075         int gotstate = 0, changed = 0, do_present = 0;
2076         syncops *sop = NULL;
2077         searchstate *ss;
2078         sync_control *srs;
2079         BerVarray ctxcsn;
2080         int i, *sids, numcsns;
2081         struct berval mincsn;
2082
2083         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
2084
2085         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
2086                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
2087                 return rs->sr_err;
2088         }
2089
2090         srs = op->o_controls[slap_cids.sc_LDAPsync];
2091         op->o_managedsait = SLAP_CONTROL_NONCRITICAL;
2092
2093         /* If this is a persistent search, set it up right away */
2094         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
2095                 syncops so = {0};
2096                 fbase_cookie fc;
2097                 opcookie opc;
2098                 slap_callback sc;
2099
2100                 fc.fss = &so;
2101                 fc.fbase = 0;
2102                 so.s_eid = NOID;
2103                 so.s_op = op;
2104                 so.s_flags = PS_IS_REFRESHING | PS_FIND_BASE;
2105                 /* syncprov_findbase expects to be called as a callback... */
2106                 sc.sc_private = &opc;
2107                 opc.son = on;
2108                 ldap_pvt_thread_mutex_init( &so.s_mutex );
2109                 cb = op->o_callback;
2110                 op->o_callback = &sc;
2111                 rs->sr_err = syncprov_findbase( op, &fc );
2112                 op->o_callback = cb;
2113                 ldap_pvt_thread_mutex_destroy( &so.s_mutex );
2114
2115                 if ( rs->sr_err != LDAP_SUCCESS ) {
2116                         send_ldap_result( op, rs );
2117                         return rs->sr_err;
2118                 }
2119                 sop = ch_malloc( sizeof( syncops ));
2120                 *sop = so;
2121                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
2122                 sop->s_rid = srs->sr_state.rid;
2123                 sop->s_sid = srs->sr_state.sid;
2124                 sop->s_inuse = 1;
2125
2126                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2127                 sop->s_next = si->si_ops;
2128                 si->si_ops = sop;
2129                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2130         }
2131
2132         /* snapshot the ctxcsn */
2133         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2134         numcsns = si->si_numcsns;
2135         if ( numcsns ) {
2136                 ber_bvarray_dup_x( &ctxcsn, si->si_ctxcsn, op->o_tmpmemctx );
2137                 sids = op->o_tmpalloc( numcsns * sizeof(int), op->o_tmpmemctx );
2138                 for ( i=0; i<numcsns; i++ )
2139                         sids[i] = si->si_sids[i];
2140         } else {
2141                 ctxcsn = NULL;
2142                 sids = NULL;
2143         }
2144         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2145
2146         /* If we have a cookie, handle the PRESENT lookups */
2147         if ( srs->sr_state.ctxcsn ) {
2148                 sessionlog *sl;
2149                 int i, j;
2150
2151                 /* If we don't have any CSN of our own yet, pretend nothing
2152                  * has changed.
2153                  */
2154                 if ( !numcsns )
2155                         goto no_change;
2156
2157                 if ( !si->si_nopres )
2158                         do_present = SS_PRESENT;
2159
2160                 /* If there are SIDs we don't recognize in the cookie, drop them */
2161                 for (i=0; i<srs->sr_state.numcsns; ) {
2162                         for (j=0; j<numcsns; j++) {
2163                                 if ( srs->sr_state.sids[i] == sids[j] ) {
2164                                         break;
2165                                 }
2166                         }
2167                         /* not found */
2168                         if ( j == numcsns ) {
2169                                 struct berval tmp = srs->sr_state.ctxcsn[i];
2170                                 j = srs->sr_state.numcsns - 1;
2171                                 srs->sr_state.ctxcsn[i] = srs->sr_state.ctxcsn[j];
2172                                 tmp.bv_len = 0;
2173                                 srs->sr_state.ctxcsn[j] = tmp;
2174                                 srs->sr_state.numcsns = j;
2175                                 srs->sr_state.sids[i] = srs->sr_state.sids[j];
2176                                 continue;
2177                         }
2178                         i++;
2179                 }
2180
2181                 /* Find the smallest CSN */
2182                 mincsn = srs->sr_state.ctxcsn[0];
2183                 for ( i=1; i<srs->sr_state.numcsns; i++ ) {
2184                         if ( ber_bvcmp( &mincsn, &srs->sr_state.ctxcsn[i] ) > 0 )
2185                                 mincsn = srs->sr_state.ctxcsn[i];
2186                 }
2187
2188                 /* If nothing has changed, shortcut it */
2189                 if ( srs->sr_state.numcsns == numcsns ) {
2190                         int i, j;
2191                         for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2192                                 for ( j=0; j<numcsns; j++ ) {
2193                                         if ( srs->sr_state.sids[i] != sids[j] )
2194                                                 continue;
2195                                         if ( !bvmatch( &srs->sr_state.ctxcsn[i], &ctxcsn[j] ))
2196                                                 changed = SS_CHANGED;
2197                                         break;
2198                                 }
2199                                 if ( changed )
2200                                         break;
2201                         }
2202                         if ( !changed ) {
2203                                 do_present = 0;
2204 no_change:              if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
2205                                         LDAPControl     *ctrls[2];
2206
2207                                         ctrls[0] = NULL;
2208                                         ctrls[1] = NULL;
2209                                         syncprov_done_ctrl( op, rs, ctrls, 0, 0,
2210                                                 NULL, LDAP_SYNC_REFRESH_DELETES );
2211                                         rs->sr_ctrls = ctrls;
2212                                         rs->sr_err = LDAP_SUCCESS;
2213                                         send_ldap_result( op, rs );
2214                                         rs->sr_ctrls = NULL;
2215                                         return rs->sr_err;
2216                                 }
2217                                 goto shortcut;
2218                         }
2219                 }
2220                 /* Do we have a sessionlog for this search? */
2221                 sl=si->si_logs;
2222                 if ( sl ) {
2223                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
2224                         /* Are there any log entries, and is the consumer state
2225                          * present in the session log?
2226                          */
2227                         if ( sl->sl_num > 0 && ber_bvcmp( &mincsn, &sl->sl_mincsn ) >= 0 ) {
2228                                 do_present = 0;
2229                                 /* mutex is unlocked in playlog */
2230                                 syncprov_playlog( op, rs, sl, srs, ctxcsn, numcsns, sids );
2231                         } else {
2232                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
2233                         }
2234                 }
2235                 /* Is the CSN still present in the database? */
2236                 if ( syncprov_findcsn( op, FIND_CSN ) != LDAP_SUCCESS ) {
2237                         /* No, so a reload is required */
2238                         /* the 2.2 consumer doesn't send this hint */
2239                         if ( si->si_usehint && srs->sr_rhint == 0 ) {
2240                                 if ( ctxcsn )
2241                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2242                                 if ( sids )
2243                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2244                                 send_ldap_error( op, rs, LDAP_SYNC_REFRESH_REQUIRED, "sync cookie is stale" );
2245                                 return rs->sr_err;
2246                         }
2247                 } else {
2248                         gotstate = 1;
2249                         /* If changed and doing Present lookup, send Present UUIDs */
2250                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT ) !=
2251                                 LDAP_SUCCESS ) {
2252                                 if ( ctxcsn )
2253                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2254                                 if ( sids )
2255                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2256                                 send_ldap_result( op, rs );
2257                                 return rs->sr_err;
2258                         }
2259                 }
2260         } else {
2261                 /* No consumer state, assume something has changed */
2262                 changed = SS_CHANGED;
2263         }
2264
2265 shortcut:
2266         /* Append CSN range to search filter, save original filter
2267          * for persistent search evaluation
2268          */
2269         if ( sop ) {
2270                 sop->s_filterstr= op->ors_filterstr;
2271         }
2272
2273         /* If something changed, find the changes */
2274         if ( gotstate && changed ) {
2275                 Filter *fand, *fava;
2276
2277                 fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2278                 fand->f_choice = LDAP_FILTER_AND;
2279                 fand->f_next = NULL;
2280                 fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2281                 fand->f_and = fava;
2282                 fava->f_choice = LDAP_FILTER_GE;
2283                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
2284                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
2285 #ifdef LDAP_COMP_MATCH
2286                 fava->f_ava->aa_cf = NULL;
2287 #endif
2288                 ber_dupbv_x( &fava->f_ava->aa_value, &mincsn, op->o_tmpmemctx );
2289                 fava->f_next = op->ors_filter;
2290                 op->ors_filter = fand;
2291                 filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
2292                 if ( sop )
2293                         sop->s_flags |= PS_FIX_FILTER;
2294         }
2295
2296         /* Let our callback add needed info to returned entries */
2297         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
2298         ss = (searchstate *)(cb+1);
2299         ss->ss_on = on;
2300         ss->ss_so = sop;
2301         ss->ss_flags = do_present | changed;
2302         ss->ss_ctxcsn = ctxcsn;
2303         ss->ss_numcsns = numcsns;
2304         ss->ss_sids = sids;
2305         cb->sc_response = syncprov_search_response;
2306         cb->sc_cleanup = syncprov_search_cleanup;
2307         cb->sc_private = ss;
2308         cb->sc_next = op->o_callback;
2309         op->o_callback = cb;
2310
2311         /* If this is a persistent search and no changes were reported during
2312          * the refresh phase, just invoke the response callback to transition
2313          * us into persist phase
2314          */
2315         if ( !changed ) {
2316                 rs->sr_err = LDAP_SUCCESS;
2317                 rs->sr_nentries = 0;
2318                 send_ldap_result( op, rs );
2319                 return rs->sr_err;
2320         }
2321         return SLAP_CB_CONTINUE;
2322 }
2323
2324 static int
2325 syncprov_operational(
2326         Operation *op,
2327         SlapReply *rs )
2328 {
2329         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2330         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2331
2332         /* This prevents generating unnecessarily; frontend will strip
2333          * any statically stored copy.
2334          */
2335         if ( op->o_sync != SLAP_CONTROL_NONE )
2336                 return SLAP_CB_CONTINUE;
2337
2338         if ( rs->sr_entry &&
2339                 dn_match( &rs->sr_entry->e_nname, op->o_bd->be_nsuffix )) {
2340
2341                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
2342                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
2343                         Attribute *a, **ap = NULL;
2344
2345                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
2346                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
2347                                         break;
2348                         }
2349
2350                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2351                         if ( si->si_ctxcsn ) {
2352                                 if ( !a ) {
2353                                         for ( ap = &rs->sr_operational_attrs; *ap;
2354                                                 ap=&(*ap)->a_next );
2355
2356                                         a = attr_alloc( slap_schema.si_ad_contextCSN );
2357                                         *ap = a;
2358                                 }
2359
2360                                 if ( !ap ) {
2361                                         if ( !rs->sr_flags & REP_ENTRY_MODIFIABLE ) {
2362                                                 rs->sr_entry = entry_dup( rs->sr_entry );
2363                                                 rs->sr_flags |=
2364                                                         REP_ENTRY_MODIFIABLE|REP_ENTRY_MUSTBEFREED;
2365                                                 a = attr_find( rs->sr_entry->e_attrs,
2366                                                         slap_schema.si_ad_contextCSN );
2367                                         }
2368                                         if ( a->a_nvals != a->a_vals ) {
2369                                                 ber_bvarray_free( a->a_nvals );
2370                                         }
2371                                         a->a_nvals = NULL;
2372                                         ber_bvarray_free( a->a_vals );
2373                                         a->a_vals = NULL;
2374                                         a->a_numvals = 0;
2375                                 }
2376                                 attr_valadd( a, si->si_ctxcsn, si->si_ctxcsn, si->si_numcsns );
2377                         }
2378                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2379                 }
2380         }
2381         return SLAP_CB_CONTINUE;
2382 }
2383
2384 enum {
2385         SP_CHKPT = 1,
2386         SP_SESSL,
2387         SP_NOPRES,
2388         SP_USEHINT
2389 };
2390
2391 static ConfigDriver sp_cf_gen;
2392
2393 static ConfigTable spcfg[] = {
2394         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2395                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2396                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2397                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2398         { "syncprov-sessionlog", "ops", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2399                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2400                         "DESC 'Session log size in ops' "
2401                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2402         { "syncprov-nopresent", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_NOPRES,
2403                 sp_cf_gen, "( OLcfgOvAt:1.3 NAME 'olcSpNoPresent' "
2404                         "DESC 'Omit Present phase processing' "
2405                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2406         { "syncprov-reloadhint", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_USEHINT,
2407                 sp_cf_gen, "( OLcfgOvAt:1.4 NAME 'olcSpReloadHint' "
2408                         "DESC 'Observe Reload Hint in Request control' "
2409                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2410         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2411 };
2412
2413 static ConfigOCs spocs[] = {
2414         { "( OLcfgOvOc:1.1 "
2415                 "NAME 'olcSyncProvConfig' "
2416                 "DESC 'SyncRepl Provider configuration' "
2417                 "SUP olcOverlayConfig "
2418                 "MAY ( olcSpCheckpoint $ olcSpSessionlog $ olcSpNoPresent ) )",
2419                         Cft_Overlay, spcfg },
2420         { NULL, 0, NULL }
2421 };
2422
2423 static int
2424 sp_cf_gen(ConfigArgs *c)
2425 {
2426         slap_overinst           *on = (slap_overinst *)c->bi;
2427         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2428         int rc = 0;
2429
2430         if ( c->op == SLAP_CONFIG_EMIT ) {
2431                 switch ( c->type ) {
2432                 case SP_CHKPT:
2433                         if ( si->si_chkops || si->si_chktime ) {
2434                                 struct berval bv;
2435                                 bv.bv_len = snprintf( c->cr_msg, sizeof( c->cr_msg ),
2436                                         "%d %d", si->si_chkops, si->si_chktime );
2437                                 if ( bv.bv_len < 0 || bv.bv_len >= sizeof( c->cr_msg ) ) {
2438                                         rc = 1;
2439                                 } else {
2440                                         bv.bv_val = c->cr_msg;
2441                                         value_add_one( &c->rvalue_vals, &bv );
2442                                 }
2443                         } else {
2444                                 rc = 1;
2445                         }
2446                         break;
2447                 case SP_SESSL:
2448                         if ( si->si_logs ) {
2449                                 c->value_int = si->si_logs->sl_size;
2450                         } else {
2451                                 rc = 1;
2452                         }
2453                         break;
2454                 case SP_NOPRES:
2455                         if ( si->si_nopres ) {
2456                                 c->value_int = 1;
2457                         } else {
2458                                 rc = 1;
2459                         }
2460                         break;
2461                 case SP_USEHINT:
2462                         if ( si->si_usehint ) {
2463                                 c->value_int = 1;
2464                         } else {
2465                                 rc = 1;
2466                         }
2467                         break;
2468                 }
2469                 return rc;
2470         } else if ( c->op == LDAP_MOD_DELETE ) {
2471                 switch ( c->type ) {
2472                 case SP_CHKPT:
2473                         si->si_chkops = 0;
2474                         si->si_chktime = 0;
2475                         break;
2476                 case SP_SESSL:
2477                         if ( si->si_logs )
2478                                 si->si_logs->sl_size = 0;
2479                         else
2480                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2481                         break;
2482                 case SP_NOPRES:
2483                         if ( si->si_nopres )
2484                                 si->si_nopres = 0;
2485                         else
2486                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2487                         break;
2488                 case SP_USEHINT:
2489                         if ( si->si_usehint )
2490                                 si->si_usehint = 0;
2491                         else
2492                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2493                         break;
2494                 }
2495                 return rc;
2496         }
2497         switch ( c->type ) {
2498         case SP_CHKPT:
2499                 if ( lutil_atoi( &si->si_chkops, c->argv[1] ) != 0 ) {
2500                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint ops # \"%s\"",
2501                                 c->argv[0], c->argv[1] );
2502                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2503                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2504                         return ARG_BAD_CONF;
2505                 }
2506                 if ( si->si_chkops <= 0 ) {
2507                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint ops # \"%d\"",
2508                                 c->argv[0], si->si_chkops );
2509                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2510                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2511                         return ARG_BAD_CONF;
2512                 }
2513                 if ( lutil_atoi( &si->si_chktime, c->argv[2] ) != 0 ) {
2514                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint time \"%s\"",
2515                                 c->argv[0], c->argv[1] );
2516                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2517                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2518                         return ARG_BAD_CONF;
2519                 }
2520                 if ( si->si_chktime <= 0 ) {
2521                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint time \"%d\"",
2522                                 c->argv[0], si->si_chkops );
2523                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2524                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2525                         return ARG_BAD_CONF;
2526                 }
2527                 si->si_chktime *= 60;
2528                 break;
2529         case SP_SESSL: {
2530                 sessionlog *sl;
2531                 int size = c->value_int;
2532
2533                 if ( size < 0 ) {
2534                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s size %d is negative",
2535                                 c->argv[0], size );
2536                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2537                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2538                         return ARG_BAD_CONF;
2539                 }
2540                 sl = si->si_logs;
2541                 if ( !sl ) {
2542                         sl = ch_malloc( sizeof( sessionlog ) + LDAP_LUTIL_CSNSTR_BUFSIZE );
2543                         sl->sl_mincsn.bv_val = (char *)(sl+1);
2544                         sl->sl_mincsn.bv_len = 0;
2545                         sl->sl_num = 0;
2546                         sl->sl_head = sl->sl_tail = NULL;
2547                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
2548                         si->si_logs = sl;
2549                 }
2550                 sl->sl_size = size;
2551                 }
2552                 break;
2553         case SP_NOPRES:
2554                 si->si_nopres = c->value_int;
2555                 break;
2556         case SP_USEHINT:
2557                 si->si_usehint = c->value_int;
2558                 break;
2559         }
2560         return rc;
2561 }
2562
2563 /* ITS#3456 we cannot run this search on the main thread, must use a
2564  * child thread in order to insure we have a big enough stack.
2565  */
2566 static void *
2567 syncprov_db_otask(
2568         void *ptr
2569 )
2570 {
2571         syncprov_findcsn( ptr, FIND_MAXCSN );
2572         return NULL;
2573 }
2574
2575 /* Read any existing contextCSN from the underlying db.
2576  * Then search for any entries newer than that. If no value exists,
2577  * just generate it. Cache whatever result.
2578  */
2579 static int
2580 syncprov_db_open(
2581         BackendDB *be,
2582         ConfigReply *cr
2583 )
2584 {
2585         slap_overinst   *on = (slap_overinst *) be->bd_info;
2586         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2587
2588         Connection conn = { 0 };
2589         OperationBuffer opbuf;
2590         Operation *op;
2591         Entry *e = NULL;
2592         Attribute *a;
2593         int rc;
2594         void *thrctx = NULL;
2595
2596         if ( !SLAP_LASTMOD( be )) {
2597                 Debug( LDAP_DEBUG_ANY,
2598                         "syncprov_db_open: invalid config, lastmod must be enabled\n", 0, 0, 0 );
2599                 return -1;
2600         }
2601
2602         if ( slapMode & SLAP_TOOL_MODE ) {
2603                 return 0;
2604         }
2605
2606         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
2607         if ( rc ) {
2608                 return rc;
2609         }
2610
2611         thrctx = ldap_pvt_thread_pool_context();
2612         connection_fake_init( &conn, &opbuf, thrctx );
2613         op = &opbuf.ob_op;
2614         op->o_bd = be;
2615         op->o_dn = be->be_rootdn;
2616         op->o_ndn = be->be_rootndn;
2617
2618         rc = overlay_entry_get_ov( op, be->be_nsuffix, NULL,
2619                 slap_schema.si_ad_contextCSN, 0, &e, on );
2620
2621         if ( e ) {
2622                 ldap_pvt_thread_t tid;
2623
2624                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
2625                 if ( a ) {
2626                         ber_bvarray_dup_x( &si->si_ctxcsn, a->a_vals, NULL );
2627                         si->si_numcsns = a->a_numvals;
2628                         si->si_sids = slap_parse_csn_sids( si->si_ctxcsn, a->a_numvals, NULL );
2629                 }
2630                 overlay_entry_release_ov( op, e, 0, on );
2631                 if ( si->si_ctxcsn ) {
2632                         op->o_req_dn = be->be_suffix[0];
2633                         op->o_req_ndn = be->be_nsuffix[0];
2634                         op->ors_scope = LDAP_SCOPE_SUBTREE;
2635                         ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
2636                         ldap_pvt_thread_join( tid, NULL );
2637                 }
2638         }
2639
2640         /* Didn't find a contextCSN, should we generate one? */
2641         if ( !si->si_ctxcsn ) {
2642                 char csnbuf[ LDAP_LUTIL_CSNSTR_BUFSIZE ];
2643                 struct berval csn;
2644
2645                 if ( SLAP_SYNC_SHADOW( op->o_bd )) {
2646                 /* If we're also a consumer, then don't generate anything.
2647                  * Wait for our provider to send it to us, or for a local
2648                  * modify if we have multimaster.
2649                  */
2650                         goto out;
2651                 }
2652                 csn.bv_val = csnbuf;
2653                 csn.bv_len = sizeof( csnbuf );
2654                 slap_get_csn( op, &csn, 0 );
2655                 value_add_one( &si->si_ctxcsn, &csn );
2656                 si->si_numcsns = 1;
2657                 si->si_sids = ch_malloc( sizeof(int) );
2658                 si->si_sids[0] = slap_serverID;
2659
2660                 /* make sure we do a checkpoint on close */
2661                 si->si_numops++;
2662         }
2663
2664 out:
2665         op->o_bd->bd_info = (BackendInfo *)on;
2666         return 0;
2667 }
2668
2669 /* Write the current contextCSN into the underlying db.
2670  */
2671 static int
2672 syncprov_db_close(
2673         BackendDB *be,
2674         ConfigReply *cr
2675 )
2676 {
2677     slap_overinst   *on = (slap_overinst *) be->bd_info;
2678     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2679
2680         if ( slapMode & SLAP_TOOL_MODE ) {
2681                 return 0;
2682         }
2683         if ( si->si_numops ) {
2684                 Connection conn = {0};
2685                 OperationBuffer opbuf;
2686                 Operation *op;
2687                 SlapReply rs = {REP_RESULT};
2688                 void *thrctx;
2689
2690                 thrctx = ldap_pvt_thread_pool_context();
2691                 connection_fake_init( &conn, &opbuf, thrctx );
2692                 op = &opbuf.ob_op;
2693                 op->o_bd = be;
2694                 op->o_dn = be->be_rootdn;
2695                 op->o_ndn = be->be_rootndn;
2696                 syncprov_checkpoint( op, &rs, on );
2697         }
2698
2699     return 0;
2700 }
2701
2702 static int
2703 syncprov_db_init(
2704         BackendDB *be,
2705         ConfigReply *cr
2706 )
2707 {
2708         slap_overinst   *on = (slap_overinst *)be->bd_info;
2709         syncprov_info_t *si;
2710
2711         if ( SLAP_ISGLOBALOVERLAY( be ) ) {
2712                 Debug( LDAP_DEBUG_ANY,
2713                         "syncprov must be instantiated within a database.\n",
2714                         0, 0, 0 );
2715                 return 1;
2716         }
2717
2718         si = ch_calloc(1, sizeof(syncprov_info_t));
2719         on->on_bi.bi_private = si;
2720         ldap_pvt_thread_rdwr_init( &si->si_csn_rwlock );
2721         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
2722         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
2723
2724         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
2725         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
2726         csn_anlist[1].an_desc = slap_schema.si_ad_entryUUID;
2727         csn_anlist[1].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2728
2729         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
2730         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2731
2732         return 0;
2733 }
2734
2735 static int
2736 syncprov_db_destroy(
2737         BackendDB *be,
2738         ConfigReply *cr
2739 )
2740 {
2741         slap_overinst   *on = (slap_overinst *)be->bd_info;
2742         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2743
2744         if ( si ) {
2745                 if ( si->si_logs ) {
2746                         slog_entry *se = si->si_logs->sl_head;
2747
2748                         while ( se ) {
2749                                 slog_entry *se_next = se->se_next;
2750                                 ch_free( se );
2751                                 se = se_next;
2752                         }
2753
2754                         ch_free( si->si_logs );
2755                 }
2756                 if ( si->si_ctxcsn )
2757                         ber_bvarray_free( si->si_ctxcsn );
2758                 if ( si->si_sids )
2759                         ch_free( si->si_sids );
2760                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
2761                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
2762                 ldap_pvt_thread_rdwr_destroy( &si->si_csn_rwlock );
2763                 ch_free( si );
2764         }
2765
2766         return 0;
2767 }
2768
2769 static int syncprov_parseCtrl (
2770         Operation *op,
2771         SlapReply *rs,
2772         LDAPControl *ctrl )
2773 {
2774         ber_tag_t tag;
2775         BerElementBuffer berbuf;
2776         BerElement *ber = (BerElement *)&berbuf;
2777         ber_int_t mode;
2778         ber_len_t len;
2779         struct berval cookie = BER_BVNULL;
2780         sync_control *sr;
2781         int rhint = 0;
2782
2783         if ( op->o_sync != SLAP_CONTROL_NONE ) {
2784                 rs->sr_text = "Sync control specified multiple times";
2785                 return LDAP_PROTOCOL_ERROR;
2786         }
2787
2788         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
2789                 rs->sr_text = "Sync control specified with pagedResults control";
2790                 return LDAP_PROTOCOL_ERROR;
2791         }
2792
2793         if ( BER_BVISNULL( &ctrl->ldctl_value ) ) {
2794                 rs->sr_text = "Sync control value is absent";
2795                 return LDAP_PROTOCOL_ERROR;
2796         }
2797
2798         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
2799                 rs->sr_text = "Sync control value is empty";
2800                 return LDAP_PROTOCOL_ERROR;
2801         }
2802
2803         /* Parse the control value
2804          *      syncRequestValue ::= SEQUENCE {
2805          *              mode   ENUMERATED {
2806          *                      -- 0 unused
2807          *                      refreshOnly             (1),
2808          *                      -- 2 reserved
2809          *                      refreshAndPersist       (3)
2810          *              },
2811          *              cookie  syncCookie OPTIONAL
2812          *      }
2813          */
2814
2815         ber_init2( ber, &ctrl->ldctl_value, 0 );
2816
2817         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
2818                 rs->sr_text = "Sync control : mode decoding error";
2819                 return LDAP_PROTOCOL_ERROR;
2820         }
2821
2822         switch( mode ) {
2823         case LDAP_SYNC_REFRESH_ONLY:
2824                 mode = SLAP_SYNC_REFRESH;
2825                 break;
2826         case LDAP_SYNC_REFRESH_AND_PERSIST:
2827                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
2828                 break;
2829         default:
2830                 rs->sr_text = "Sync control : unknown update mode";
2831                 return LDAP_PROTOCOL_ERROR;
2832         }
2833
2834         tag = ber_peek_tag( ber, &len );
2835
2836         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
2837                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
2838                         rs->sr_text = "Sync control : cookie decoding error";
2839                         return LDAP_PROTOCOL_ERROR;
2840                 }
2841                 tag = ber_peek_tag( ber, &len );
2842         }
2843         if ( tag == LDAP_TAG_RELOAD_HINT ) {
2844                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
2845                         rs->sr_text = "Sync control : rhint decoding error";
2846                         return LDAP_PROTOCOL_ERROR;
2847                 }
2848         }
2849         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
2850                         rs->sr_text = "Sync control : decoding error";
2851                         return LDAP_PROTOCOL_ERROR;
2852         }
2853         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
2854         sr->sr_rhint = rhint;
2855         if (!BER_BVISNULL(&cookie)) {
2856                 ber_dupbv_x( &sr->sr_state.octet_str, &cookie, op->o_tmpmemctx );
2857                 /* If parse fails, pretend no cookie was sent */
2858                 if ( slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx ) ||
2859                         sr->sr_state.rid == -1 ) {
2860                         if ( sr->sr_state.ctxcsn ) {
2861                                 ber_bvarray_free_x( sr->sr_state.ctxcsn, op->o_tmpmemctx );
2862                                 sr->sr_state.ctxcsn = NULL;
2863                         }
2864                         sr->sr_state.numcsns = 0;
2865                 }
2866         }
2867
2868         op->o_controls[slap_cids.sc_LDAPsync] = sr;
2869
2870         op->o_sync = ctrl->ldctl_iscritical
2871                 ? SLAP_CONTROL_CRITICAL
2872                 : SLAP_CONTROL_NONCRITICAL;
2873
2874         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
2875
2876         return LDAP_SUCCESS;
2877 }
2878
2879 /* This overlay is set up for dynamic loading via moduleload. For static
2880  * configuration, you'll need to arrange for the slap_overinst to be
2881  * initialized and registered by some other function inside slapd.
2882  */
2883
2884 static slap_overinst            syncprov;
2885
2886 int
2887 syncprov_initialize()
2888 {
2889         int rc;
2890
2891         rc = register_supported_control( LDAP_CONTROL_SYNC,
2892                 SLAP_CTRL_SEARCH, NULL,
2893                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
2894         if ( rc != LDAP_SUCCESS ) {
2895                 Debug( LDAP_DEBUG_ANY,
2896                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
2897                 return rc;
2898         }
2899
2900         syncprov.on_bi.bi_type = "syncprov";
2901         syncprov.on_bi.bi_db_init = syncprov_db_init;
2902         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
2903         syncprov.on_bi.bi_db_open = syncprov_db_open;
2904         syncprov.on_bi.bi_db_close = syncprov_db_close;
2905
2906         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
2907         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
2908
2909         syncprov.on_bi.bi_op_add = syncprov_op_mod;
2910         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
2911         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
2912         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
2913         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
2914         syncprov.on_bi.bi_op_search = syncprov_op_search;
2915         syncprov.on_bi.bi_extended = syncprov_op_extended;
2916         syncprov.on_bi.bi_operational = syncprov_operational;
2917
2918         syncprov.on_bi.bi_cf_ocs = spocs;
2919
2920         generic_filter.f_desc = slap_schema.si_ad_objectClass;
2921
2922         rc = config_register_schema( spcfg, spocs );
2923         if ( rc ) return rc;
2924
2925         return overlay_register( &syncprov );
2926 }
2927
2928 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
2929 int
2930 init_module( int argc, char *argv[] )
2931 {
2932         return syncprov_initialize();
2933 }
2934 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
2935
2936 #endif /* defined(SLAPD_OVER_SYNCPROV) */