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 2004-2014 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 #ifdef LDAP_DEVEL
  32 #define CHECK_CSN       1
  33 #endif
  34
  35 /* A modify request on a particular entry */
  36 typedef struct modinst {
  37         struct modinst *mi_next;
  38         Operation *mi_op;
  39 } modinst;
  40
  41 typedef struct modtarget {
  42         struct modinst *mt_mods;
  43         struct modinst *mt_tail;
  44         struct berval mt_dn;
  45         ldap_pvt_thread_mutex_t mt_mutex;
  46 } modtarget;
  47
  48 /* All the info of a psearch result that's shared between
  49  * multiple queues
  50  */
  51 typedef struct resinfo {
  52         struct syncres *ri_list;
  53         Entry *ri_e;
  54         struct berval ri_dn;
  55         struct berval ri_ndn;
  56         struct berval ri_uuid;
  57         struct berval ri_csn;
  58         struct berval ri_cookie;
  59         char ri_isref;
  60         ldap_pvt_thread_mutex_t ri_mutex;
  61 } resinfo;
  62
  63 /* A queued result of a persistent search */
  64 typedef struct syncres {
  65         struct syncres *s_next; /* list of results on this psearch queue */
  66         struct syncres *s_rilist;       /* list of psearches using this result */
  67         resinfo *s_info;
  68         char s_mode;
  69 } syncres;
  70
  71 /* Record of a persistent search */
  72 typedef struct syncops {
  73         struct syncops *s_next;
  74         struct syncprov_info_t *s_si;
  75         struct berval   s_base;         /* ndn of search base */
  76         ID              s_eid;          /* entryID of search base */
  77         Operation       *s_op;          /* search op */
  78         int             s_rid;
  79         int             s_sid;
  80         struct berval s_filterstr;
  81         int             s_flags;        /* search status */
  82 #define PS_IS_REFRESHING        0x01
  83 #define PS_IS_DETACHED          0x02
  84 #define PS_WROTE_BASE           0x04
  85 #define PS_FIND_BASE            0x08
  86 #define PS_FIX_FILTER           0x10
  87 #define PS_TASK_QUEUED          0x20
  88
  89         int             s_inuse;        /* reference count */
  90         struct syncres *s_res;
  91         struct syncres *s_restail;
  92         ldap_pvt_thread_mutex_t s_mutex;
  93 } syncops;
  94
  95 /* A received sync control */
  96 typedef struct sync_control {
  97         struct sync_cookie sr_state;
  98         int sr_rhint;
  99 } sync_control;
 100
 101 #if 0 /* moved back to slap.h */
 102 #define o_sync  o_ctrlflag[slap_cids.sc_LDAPsync]
 103 #endif
 104 /* o_sync_mode uses data bits of o_sync */
 105 #define o_sync_mode     o_ctrlflag[slap_cids.sc_LDAPsync]
 106
 107 #define SLAP_SYNC_NONE                                  (LDAP_SYNC_NONE<<SLAP_CONTROL_SHIFT)
 108 #define SLAP_SYNC_REFRESH                               (LDAP_SYNC_REFRESH_ONLY<<SLAP_CONTROL_SHIFT)
 109 #define SLAP_SYNC_PERSIST                               (LDAP_SYNC_RESERVED<<SLAP_CONTROL_SHIFT)
 110 #define SLAP_SYNC_REFRESH_AND_PERSIST   (LDAP_SYNC_REFRESH_AND_PERSIST<<SLAP_CONTROL_SHIFT)
 111
 112 /* Record of which searches matched at premodify step */
 113 typedef struct syncmatches {
 114         struct syncmatches *sm_next;
 115         syncops *sm_op;
 116 } syncmatches;
 117
 118 /* Session log data */
 119 typedef struct slog_entry {
 120         struct slog_entry *se_next;
 121         struct berval se_uuid;
 122         struct berval se_csn;
 123         int     se_sid;
 124         ber_tag_t       se_tag;
 125 } slog_entry;
 126
 127 typedef struct sessionlog {
 128         BerVarray       sl_mincsn;
 129         int             *sl_sids;
 130         int             sl_numcsns;
 131         int             sl_num;
 132         int             sl_size;
 133         slog_entry *sl_head;
 134         slog_entry *sl_tail;
 135         ldap_pvt_thread_mutex_t sl_mutex;
 136 } sessionlog;
 137
 138 /* The main state for this overlay */
 139 typedef struct syncprov_info_t {
 140         syncops         *si_ops;
 141         struct berval   si_contextdn;
 142         BerVarray       si_ctxcsn;      /* ldapsync context */
 143         int             *si_sids;
 144         int             si_numcsns;
 145         int             si_chkops;      /* checkpointing info */
 146         int             si_chktime;
 147         int             si_numops;      /* number of ops since last checkpoint */
 148         int             si_nopres;      /* Skip present phase */
 149         int             si_usehint;     /* use reload hint */
 150         int             si_active;      /* True if there are active mods */
 151         int             si_dirty;       /* True if the context is dirty, i.e changes
 152                                                  * have been made without updating the csn. */
 153         time_t  si_chklast;     /* time of last checkpoint */
 154         Avlnode *si_mods;       /* entries being modified */
 155         sessionlog      *si_logs;
 156         ldap_pvt_thread_rdwr_t  si_csn_rwlock;
 157         ldap_pvt_thread_mutex_t si_ops_mutex;
 158         ldap_pvt_thread_mutex_t si_mods_mutex;
 159         ldap_pvt_thread_mutex_t si_resp_mutex;
 160 } syncprov_info_t;
 161
 162 typedef struct opcookie {
 163         slap_overinst *son;
 164         syncmatches *smatches;
 165         modtarget *smt;
 166         Entry *se;
 167         struct berval sdn;      /* DN of entry, for deletes */
 168         struct berval sndn;
 169         struct berval suuid;    /* UUID of entry */
 170         struct berval sctxcsn;
 171         short osid;     /* sid of op csn */
 172         short rsid;     /* sid of relay */
 173         short sreference;       /* Is the entry a reference? */
 174         syncres ssres;
 175 } opcookie;
 176
 177 typedef struct fbase_cookie {
 178         struct berval *fdn;     /* DN of a modified entry, for scope testing */
 179         syncops *fss;   /* persistent search we're testing against */
 180         int fbase;      /* if TRUE we found the search base and it's still valid */
 181         int fscope;     /* if TRUE then fdn is within the psearch scope */
 182 } fbase_cookie;
 183
 184 static AttributeName csn_anlist[3];
 185 static AttributeName uuid_anlist[2];
 186
 187 /* Build a LDAPsync intermediate state control */
 188 static int
 189 syncprov_state_ctrl(
 190         Operation       *op,
 191         SlapReply       *rs,
 192         Entry           *e,
 193         int             entry_sync_state,
 194         LDAPControl     **ctrls,
 195         int             num_ctrls,
 196         int             send_cookie,
 197         struct berval   *cookie )
 198 {
 199         Attribute* a;
 200         int ret;
 201
 202         BerElementBuffer berbuf;
 203         BerElement *ber = (BerElement *)&berbuf;
 204         LDAPControl *cp;
 205         struct berval bv;
 206         struct berval   entryuuid_bv = BER_BVNULL;
 207
 208         ber_init2( ber, 0, LBER_USE_DER );
 209         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 210
 211         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 212                 AttributeDescription *desc = a->a_desc;
 213                 if ( desc == slap_schema.si_ad_entryUUID ) {
 214                         entryuuid_bv = a->a_nvals[0];
 215                         break;
 216                 }
 217         }
 218
 219         /* FIXME: what if entryuuid is NULL or empty ? */
 220
 221         if ( send_cookie && cookie ) {
 222                 ber_printf( ber, "{eOON}",
 223                         entry_sync_state, &entryuuid_bv, cookie );
 224         } else {
 225                 ber_printf( ber, "{eON}",
 226                         entry_sync_state, &entryuuid_bv );
 227         }
 228
 229         ret = ber_flatten2( ber, &bv, 0 );
 230         if ( ret == 0 ) {
 231                 cp = op->o_tmpalloc( sizeof( LDAPControl ) + bv.bv_len, op->o_tmpmemctx );
 232                 cp->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 233                 cp->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 234                 cp->ldctl_value.bv_val = (char *)&cp[1];
 235                 cp->ldctl_value.bv_len = bv.bv_len;
 236                 AC_MEMCPY( cp->ldctl_value.bv_val, bv.bv_val, bv.bv_len );
 237                 ctrls[num_ctrls] = cp;
 238         }
 239         ber_free_buf( ber );
 240
 241         if ( ret < 0 ) {
 242                 Debug( LDAP_DEBUG_TRACE,
 243                         "slap_build_sync_ctrl: ber_flatten2 failed (%d)\n",
 244                         ret, 0, 0 );
 245                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 246                 return LDAP_OTHER;
 247         }
 248
 249         return LDAP_SUCCESS;
 250 }
 251
 252 /* Build a LDAPsync final state control */
 253 static int
 254 syncprov_done_ctrl(
 255         Operation       *op,
 256         SlapReply       *rs,
 257         LDAPControl     **ctrls,
 258         int                     num_ctrls,
 259         int                     send_cookie,
 260         struct berval *cookie,
 261         int                     refreshDeletes )
 262 {
 263         int ret;
 264         BerElementBuffer berbuf;
 265         BerElement *ber = (BerElement *)&berbuf;
 266         LDAPControl *cp;
 267         struct berval bv;
 268
 269         ber_init2( ber, NULL, LBER_USE_DER );
 270         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 271
 272         ber_printf( ber, "{" );
 273         if ( send_cookie && cookie ) {
 274                 ber_printf( ber, "O", cookie );
 275         }
 276         if ( refreshDeletes == LDAP_SYNC_REFRESH_DELETES ) {
 277                 ber_printf( ber, "b", refreshDeletes );
 278         }
 279         ber_printf( ber, "N}" );
 280
 281         ret = ber_flatten2( ber, &bv, 0 );
 282         if ( ret == 0 ) {
 283                 cp = op->o_tmpalloc( sizeof( LDAPControl ) + bv.bv_len, op->o_tmpmemctx );
 284                 cp->ldctl_oid = LDAP_CONTROL_SYNC_DONE;
 285                 cp->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 286                 cp->ldctl_value.bv_val = (char *)&cp[1];
 287                 cp->ldctl_value.bv_len = bv.bv_len;
 288                 AC_MEMCPY( cp->ldctl_value.bv_val, bv.bv_val, bv.bv_len );
 289                 ctrls[num_ctrls] = cp;
 290         }
 291
 292         ber_free_buf( ber );
 293
 294         if ( ret < 0 ) {
 295                 Debug( LDAP_DEBUG_TRACE,
 296                         "syncprov_done_ctrl: ber_flatten2 failed (%d)\n",
 297                         ret, 0, 0 );
 298                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 299                 return LDAP_OTHER;
 300         }
 301
 302         return LDAP_SUCCESS;
 303 }
 304
 305 static int
 306 syncprov_sendinfo(
 307         Operation       *op,
 308         SlapReply       *rs,
 309         int                     type,
 310         struct berval *cookie,
 311         int                     refreshDone,
 312         BerVarray       syncUUIDs,
 313         int                     refreshDeletes )
 314 {
 315         BerElementBuffer berbuf;
 316         BerElement *ber = (BerElement *)&berbuf;
 317         struct berval rspdata;
 318
 319         int ret;
 320
 321         ber_init2( ber, NULL, LBER_USE_DER );
 322         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 323
 324         if ( type ) {
 325                 switch ( type ) {
 326                 case LDAP_TAG_SYNC_NEW_COOKIE:
 327                         ber_printf( ber, "tO", type, cookie );
 328                         break;
 329                 case LDAP_TAG_SYNC_REFRESH_DELETE:
 330                 case LDAP_TAG_SYNC_REFRESH_PRESENT:
 331                         ber_printf( ber, "t{", type );
 332                         if ( cookie ) {
 333                                 ber_printf( ber, "O", cookie );
 334                         }
 335                         if ( refreshDone == 0 ) {
 336                                 ber_printf( ber, "b", refreshDone );
 337                         }
 338                         ber_printf( ber, "N}" );
 339                         break;
 340                 case LDAP_TAG_SYNC_ID_SET:
 341                         ber_printf( ber, "t{", type );
 342                         if ( cookie ) {
 343                                 ber_printf( ber, "O", cookie );
 344                         }
 345                         if ( refreshDeletes == 1 ) {
 346                                 ber_printf( ber, "b", refreshDeletes );
 347                         }
 348                         ber_printf( ber, "[W]", syncUUIDs );
 349                         ber_printf( ber, "N}" );
 350                         break;
 351                 default:
 352                         Debug( LDAP_DEBUG_TRACE,
 353                                 "syncprov_sendinfo: invalid syncinfo type (%d)\n",
 354                                 type, 0, 0 );
 355                         return LDAP_OTHER;
 356                 }
 357         }
 358
 359         ret = ber_flatten2( ber, &rspdata, 0 );
 360
 361         if ( ret < 0 ) {
 362                 Debug( LDAP_DEBUG_TRACE,
 363                         "syncprov_sendinfo: ber_flatten2 failed (%d)\n",
 364                         ret, 0, 0 );
 365                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 366                 return LDAP_OTHER;
 367         }
 368
 369         rs->sr_rspoid = LDAP_SYNC_INFO;
 370         rs->sr_rspdata = &rspdata;
 371         send_ldap_intermediate( op, rs );
 372         rs->sr_rspdata = NULL;
 373         ber_free_buf( ber );
 374
 375         return LDAP_SUCCESS;
 376 }
 377
 378 /* Find a modtarget in an AVL tree */
 379 static int
 380 sp_avl_cmp( const void *c1, const void *c2 )
 381 {
 382         const modtarget *m1, *m2;
 383         int rc;
 384
 385         m1 = c1; m2 = c2;
 386         rc = m1->mt_dn.bv_len - m2->mt_dn.bv_len;
 387
 388         if ( rc ) return rc;
 389         return ber_bvcmp( &m1->mt_dn, &m2->mt_dn );
 390 }
 391
 392 /* syncprov_findbase:
 393  *   finds the true DN of the base of a search (with alias dereferencing) and
 394  * checks to make sure the base entry doesn't get replaced with a different
 395  * entry (e.g., swapping trees via ModDN, or retargeting an alias). If a
 396  * change is detected, any persistent search on this base must be terminated /
 397  * reloaded.
 398  *   On the first call, we just save the DN and entryID. On subsequent calls
 399  * we compare the DN and entryID with the saved values.
 400  */
 401 static int
 402 findbase_cb( Operation *op, SlapReply *rs )
 403 {
 404         slap_callback *sc = op->o_callback;
 405
 406         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 407                 fbase_cookie *fc = sc->sc_private;
 408
 409                 /* If no entryID, we're looking for the first time.
 410                  * Just store whatever we got.
 411                  */
 412                 if ( fc->fss->s_eid == NOID ) {
 413                         fc->fbase = 2;
 414                         fc->fss->s_eid = rs->sr_entry->e_id;
 415                         ber_dupbv( &fc->fss->s_base, &rs->sr_entry->e_nname );
 416
 417                 } else if ( rs->sr_entry->e_id == fc->fss->s_eid &&
 418                         dn_match( &rs->sr_entry->e_nname, &fc->fss->s_base )) {
 419
 420                 /* OK, the DN is the same and the entryID is the same. */
 421                         fc->fbase = 1;
 422                 }
 423         }
 424         if ( rs->sr_err != LDAP_SUCCESS ) {
 425                 Debug( LDAP_DEBUG_ANY, "findbase failed! %d\n", rs->sr_err,0,0 );
 426         }
 427         return LDAP_SUCCESS;
 428 }
 429
 430 static Filter generic_filter = { LDAP_FILTER_PRESENT, { 0 }, NULL };
 431 static struct berval generic_filterstr = BER_BVC("(objectclass=*)");
 432
 433 static int
 434 syncprov_findbase( Operation *op, fbase_cookie *fc )
 435 {
 436         /* Use basic parameters from syncrepl search, but use
 437          * current op's threadctx / tmpmemctx
 438          */
 439         ldap_pvt_thread_mutex_lock( &fc->fss->s_mutex );
 440         if ( fc->fss->s_flags & PS_FIND_BASE ) {
 441                 slap_callback cb = {0};
 442                 Operation fop;
 443                 SlapReply frs = { REP_RESULT };
 444                 int rc;
 445
 446                 fc->fss->s_flags ^= PS_FIND_BASE;
 447                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 448
 449                 fop = *fc->fss->s_op;
 450
 451                 fop.o_bd = fop.o_bd->bd_self;
 452                 fop.o_hdr = op->o_hdr;
 453                 fop.o_time = op->o_time;
 454                 fop.o_tincr = op->o_tincr;
 455                 fop.o_extra = op->o_extra;
 456
 457                 cb.sc_response = findbase_cb;
 458                 cb.sc_private = fc;
 459
 460                 fop.o_sync_mode = 0;    /* turn off sync mode */
 461                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 462                 fop.o_callback = &cb;
 463                 fop.o_tag = LDAP_REQ_SEARCH;
 464                 fop.ors_scope = LDAP_SCOPE_BASE;
 465                 fop.ors_limit = NULL;
 466                 fop.ors_slimit = 1;
 467                 fop.ors_tlimit = SLAP_NO_LIMIT;
 468                 fop.ors_attrs = slap_anlist_no_attrs;
 469                 fop.ors_attrsonly = 1;
 470                 fop.ors_filter = &generic_filter;
 471                 fop.ors_filterstr = generic_filterstr;
 472
 473                 rc = fop.o_bd->be_search( &fop, &frs );
 474         } else {
 475                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 476                 fc->fbase = 1;
 477         }
 478
 479         /* After the first call, see if the fdn resides in the scope */
 480         if ( fc->fbase == 1 ) {
 481                 switch ( fc->fss->s_op->ors_scope ) {
 482                 case LDAP_SCOPE_BASE:
 483                         fc->fscope = dn_match( fc->fdn, &fc->fss->s_base );
 484                         break;
 485                 case LDAP_SCOPE_ONELEVEL: {
 486                         struct berval pdn;
 487                         dnParent( fc->fdn, &pdn );
 488                         fc->fscope = dn_match( &pdn, &fc->fss->s_base );
 489                         break; }
 490                 case LDAP_SCOPE_SUBTREE:
 491                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base );
 492                         break;
 493                 case LDAP_SCOPE_SUBORDINATE:
 494                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base ) &&
 495                                 !dn_match( fc->fdn, &fc->fss->s_base );
 496                         break;
 497                 }
 498         }
 499
 500         if ( fc->fbase )
 501                 return LDAP_SUCCESS;
 502
 503         /* If entryID has changed, then the base of this search has
 504          * changed. Invalidate the psearch.
 505          */
 506         return LDAP_NO_SUCH_OBJECT;
 507 }
 508
 509 /* syncprov_findcsn:
 510  *   This function has three different purposes, but they all use a search
 511  * that filters on entryCSN so they're combined here.
 512  * 1: at startup time, after a contextCSN has been read from the database,
 513  * we search for all entries with CSN >= contextCSN in case the contextCSN
 514  * was not checkpointed at the previous shutdown.
 515  *
 516  * 2: when the current contextCSN is known and we have a sync cookie, we search
 517  * for one entry with CSN = the cookie CSN. If not found, try <= cookie CSN.
 518  * If an entry is found, the cookie CSN is valid, otherwise it is stale.
 519  *
 520  * 3: during a refresh phase, we search for all entries with CSN <= the cookie
 521  * CSN, and generate Present records for them. We always collect this result
 522  * in SyncID sets, even if there's only one match.
 523  */
 524 typedef enum find_csn_t {
 525         FIND_MAXCSN     = 1,
 526         FIND_CSN        = 2,
 527         FIND_PRESENT    = 3
 528 } find_csn_t;
 529
 530 static int
 531 findmax_cb( Operation *op, SlapReply *rs )
 532 {
 533         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 534                 struct berval *maxcsn = op->o_callback->sc_private;
 535                 Attribute *a = attr_find( rs->sr_entry->e_attrs,
 536                         slap_schema.si_ad_entryCSN );
 537
 538                 if ( a && ber_bvcmp( &a->a_vals[0], maxcsn ) > 0 &&
 539                         slap_parse_csn_sid( &a->a_vals[0] ) == slap_serverID ) {
 540                         maxcsn->bv_len = a->a_vals[0].bv_len;
 541                         strcpy( maxcsn->bv_val, a->a_vals[0].bv_val );
 542                 }
 543         }
 544         return LDAP_SUCCESS;
 545 }
 546
 547 static int
 548 findcsn_cb( Operation *op, SlapReply *rs )
 549 {
 550         slap_callback *sc = op->o_callback;
 551
 552         /* We just want to know that at least one exists, so it's OK if
 553          * we exceed the unchecked limit.
 554          */
 555         if ( rs->sr_err == LDAP_ADMINLIMIT_EXCEEDED ||
 556                 (rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS )) {
 557                 sc->sc_private = (void *)1;
 558         }
 559         return LDAP_SUCCESS;
 560 }
 561
 562 /* Build a list of entryUUIDs for sending in a SyncID set */
 563
 564 #define UUID_LEN        16
 565
 566 typedef struct fpres_cookie {
 567         int num;
 568         BerVarray uuids;
 569         char *last;
 570 } fpres_cookie;
 571
 572 static int
 573 findpres_cb( Operation *op, SlapReply *rs )
 574 {
 575         slap_callback *sc = op->o_callback;
 576         fpres_cookie *pc = sc->sc_private;
 577         Attribute *a;
 578         int ret = SLAP_CB_CONTINUE;
 579
 580         switch ( rs->sr_type ) {
 581         case REP_SEARCH:
 582                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryUUID );
 583                 if ( a ) {
 584                         pc->uuids[pc->num].bv_val = pc->last;
 585                         AC_MEMCPY( pc->uuids[pc->num].bv_val, a->a_nvals[0].bv_val,
 586                                 pc->uuids[pc->num].bv_len );
 587                         pc->num++;
 588                         pc->last = pc->uuids[pc->num].bv_val;
 589                         pc->uuids[pc->num].bv_val = NULL;
 590                 }
 591                 ret = LDAP_SUCCESS;
 592                 if ( pc->num != SLAP_SYNCUUID_SET_SIZE )
 593                         break;
 594                 /* FALLTHRU */
 595         case REP_RESULT:
 596                 ret = rs->sr_err;
 597                 if ( pc->num ) {
 598                         ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 599                                 0, pc->uuids, 0 );
 600                         pc->uuids[pc->num].bv_val = pc->last;
 601                         pc->num = 0;
 602                         pc->last = pc->uuids[0].bv_val;
 603                 }
 604                 break;
 605         default:
 606                 break;
 607         }
 608         return ret;
 609 }
 610
 611 static int
 612 syncprov_findcsn( Operation *op, find_csn_t mode, struct berval *csn )
 613 {
 614         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 615         syncprov_info_t         *si = on->on_bi.bi_private;
 616
 617         slap_callback cb = {0};
 618         Operation fop;
 619         SlapReply frs = { REP_RESULT };
 620         char buf[LDAP_PVT_CSNSTR_BUFSIZE + STRLENOF("(entryCSN<=)")];
 621         char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
 622         struct berval maxcsn;
 623         Filter cf;
 624         AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
 625         fpres_cookie pcookie;
 626         sync_control *srs = NULL;
 627         struct slap_limits_set fc_limits;
 628         int i, rc = LDAP_SUCCESS, findcsn_retry = 1;
 629         int maxid;
 630
 631         if ( mode != FIND_MAXCSN ) {
 632                 srs = op->o_controls[slap_cids.sc_LDAPsync];
 633         }
 634
 635         fop = *op;
 636         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync_mode */
 637         /* We want pure entries, not referrals */
 638         fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 639
 640         cf.f_ava = &eq;
 641         cf.f_av_desc = slap_schema.si_ad_entryCSN;
 642         BER_BVZERO( &cf.f_av_value );
 643         cf.f_next = NULL;
 644
 645         fop.o_callback = &cb;
 646         fop.ors_limit = NULL;
 647         fop.ors_tlimit = SLAP_NO_LIMIT;
 648         fop.ors_filter = &cf;
 649         fop.ors_filterstr.bv_val = buf;
 650
 651 again:
 652         switch( mode ) {
 653         case FIND_MAXCSN:
 654                 cf.f_choice = LDAP_FILTER_GE;
 655                 /* If there are multiple CSNs, use the one with our serverID */
 656                 for ( i=0; i<si->si_numcsns; i++) {
 657                         if ( slap_serverID == si->si_sids[i] ) {
 658                                 maxid = i;
 659                                 break;
 660                         }
 661                 }
 662                 if ( i == si->si_numcsns ) {
 663                         /* No match: this is multimaster, and none of the content in the DB
 664                          * originated locally. Treat like no CSN.
 665                          */
 666                         return LDAP_NO_SUCH_OBJECT;
 667                 }
 668                 cf.f_av_value = si->si_ctxcsn[maxid];
 669                 fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 670                         "(entryCSN>=%s)", cf.f_av_value.bv_val );
 671                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 672                         return LDAP_OTHER;
 673                 }
 674                 fop.ors_attrsonly = 0;
 675                 fop.ors_attrs = csn_anlist;
 676                 fop.ors_slimit = SLAP_NO_LIMIT;
 677                 cb.sc_private = &maxcsn;
 678                 cb.sc_response = findmax_cb;
 679                 strcpy( cbuf, cf.f_av_value.bv_val );
 680                 maxcsn.bv_val = cbuf;
 681                 maxcsn.bv_len = cf.f_av_value.bv_len;
 682                 break;
 683         case FIND_CSN:
 684                 if ( BER_BVISEMPTY( &cf.f_av_value )) {
 685                         cf.f_av_value = *csn;
 686                 }
 687                 fop.o_dn = op->o_bd->be_rootdn;
 688                 fop.o_ndn = op->o_bd->be_rootndn;
 689                 fop.o_req_dn = op->o_bd->be_suffix[0];
 690                 fop.o_req_ndn = op->o_bd->be_nsuffix[0];
 691                 /* Look for exact match the first time */
 692                 if ( findcsn_retry ) {
 693                         cf.f_choice = LDAP_FILTER_EQUALITY;
 694                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 695                                 "(entryCSN=%s)", cf.f_av_value.bv_val );
 696                 /* On retry, look for <= */
 697                 } else {
 698                         cf.f_choice = LDAP_FILTER_LE;
 699                         fop.ors_limit = &fc_limits;
 700                         memset( &fc_limits, 0, sizeof( fc_limits ));
 701                         fc_limits.lms_s_unchecked = 1;
 702                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 703                                 "(entryCSN<=%s)", cf.f_av_value.bv_val );
 704                 }
 705                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 706                         return LDAP_OTHER;
 707                 }
 708                 fop.ors_attrsonly = 1;
 709                 fop.ors_attrs = slap_anlist_no_attrs;
 710                 fop.ors_slimit = 1;
 711                 cb.sc_private = NULL;
 712                 cb.sc_response = findcsn_cb;
 713                 break;
 714         case FIND_PRESENT:
 715                 fop.ors_filter = op->ors_filter;
 716                 fop.ors_filterstr = op->ors_filterstr;
 717                 fop.ors_attrsonly = 0;
 718                 fop.ors_attrs = uuid_anlist;
 719                 fop.ors_slimit = SLAP_NO_LIMIT;
 720                 cb.sc_private = &pcookie;
 721                 cb.sc_response = findpres_cb;
 722                 pcookie.num = 0;
 723
 724                 /* preallocate storage for a full set */
 725                 pcookie.uuids = op->o_tmpalloc( (SLAP_SYNCUUID_SET_SIZE+1) *
 726                         sizeof(struct berval) + SLAP_SYNCUUID_SET_SIZE * UUID_LEN,
 727                         op->o_tmpmemctx );
 728                 pcookie.last = (char *)(pcookie.uuids + SLAP_SYNCUUID_SET_SIZE+1);
 729                 pcookie.uuids[0].bv_val = pcookie.last;
 730                 pcookie.uuids[0].bv_len = UUID_LEN;
 731                 for (i=1; i<SLAP_SYNCUUID_SET_SIZE; i++) {
 732                         pcookie.uuids[i].bv_val = pcookie.uuids[i-1].bv_val + UUID_LEN;
 733                         pcookie.uuids[i].bv_len = UUID_LEN;
 734                 }
 735                 break;
 736         }
 737
 738         fop.o_bd->bd_info = (BackendInfo *)on->on_info;
 739         fop.o_bd->be_search( &fop, &frs );
 740         fop.o_bd->bd_info = (BackendInfo *)on;
 741
 742         switch( mode ) {
 743         case FIND_MAXCSN:
 744                 if ( ber_bvcmp( &si->si_ctxcsn[maxid], &maxcsn )) {
 745 #ifdef CHECK_CSN
 746                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
 747                         assert( !syn->ssyn_validate( syn, &maxcsn ));
 748 #endif
 749                         ber_bvreplace( &si->si_ctxcsn[maxid], &maxcsn );
 750                         si->si_numops++;        /* ensure a checkpoint */
 751                 }
 752                 break;
 753         case FIND_CSN:
 754                 /* If matching CSN was not found, invalidate the context. */
 755                 if ( !cb.sc_private ) {
 756                         /* If we didn't find an exact match, then try for <= */
 757                         if ( findcsn_retry ) {
 758                                 findcsn_retry = 0;
 759                                 rs_reinit( &frs, REP_RESULT );
 760                                 goto again;
 761                         }
 762                         rc = LDAP_NO_SUCH_OBJECT;
 763                 }
 764                 break;
 765         case FIND_PRESENT:
 766                 op->o_tmpfree( pcookie.uuids, op->o_tmpmemctx );
 767                 break;
 768         }
 769
 770         return rc;
 771 }
 772
 773 static void free_resinfo( syncres *sr )
 774 {
 775         syncres **st;
 776         ldap_pvt_thread_mutex_lock( &sr->s_info->ri_mutex );
 777         for (st = &sr->s_info->ri_list; *st; st = &(*st)->s_rilist) {
 778                 if (*st == sr) {
 779                         *st = sr->s_rilist;
 780                         break;
 781                 }
 782         }
 783         ldap_pvt_thread_mutex_unlock( &sr->s_info->ri_mutex );
 784         if ( !sr->s_info->ri_list ) {
 785                 ldap_pvt_thread_mutex_destroy( &sr->s_info->ri_mutex );
 786                 if ( sr->s_info->ri_e )
 787                         entry_free( sr->s_info->ri_e );
 788                 if ( !BER_BVISNULL( &sr->s_info->ri_cookie ))
 789                         ch_free( sr->s_info->ri_cookie.bv_val );
 790                 ch_free( sr->s_info );
 791         }
 792 }
 793
 794 static int
 795 syncprov_free_syncop( syncops *so, int unlink )
 796 {
 797         syncres *sr, *srnext;
 798         GroupAssertion *ga, *gnext;
 799
 800         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 801         /* already being freed, or still in use */
 802         if ( !so->s_inuse || --so->s_inuse > 0 ) {
 803                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 804                 return 0;
 805         }
 806         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 807         if ( unlink ) {
 808                 syncops **sop;
 809                 ldap_pvt_thread_mutex_lock( &so->s_si->si_ops_mutex );
 810                 for ( sop = &so->s_si->si_ops; *sop; sop = &(*sop)->s_next ) {
 811                         if ( *sop == so ) {
 812                                 *sop = so->s_next;
 813                                 break;
 814                         }
 815                 }
 816                 ldap_pvt_thread_mutex_unlock( &so->s_si->si_ops_mutex );
 817         }
 818         if ( so->s_flags & PS_IS_DETACHED ) {
 819                 filter_free( so->s_op->ors_filter );
 820                 for ( ga = so->s_op->o_groups; ga; ga=gnext ) {
 821                         gnext = ga->ga_next;
 822                         ch_free( ga );
 823                 }
 824                 ch_free( so->s_op );
 825         }
 826         ch_free( so->s_base.bv_val );
 827         for ( sr=so->s_res; sr; sr=srnext ) {
 828                 srnext = sr->s_next;
 829                 free_resinfo( sr );
 830                 ch_free( sr );
 831         }
 832         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 833         ch_free( so );
 834         return 1;
 835 }
 836
 837 /* Send a persistent search response */
 838 static int
 839 syncprov_sendresp( Operation *op, resinfo *ri, syncops *so, int mode )
 840 {
 841         SlapReply rs = { REP_SEARCH };
 842         struct berval cookie, csns[2];
 843         Entry e_uuid = {0};
 844         Attribute a_uuid = {0};
 845
 846         if ( so->s_op->o_abandon )
 847                 return SLAPD_ABANDON;
 848
 849         rs.sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2, op->o_tmpmemctx );
 850         rs.sr_ctrls[1] = NULL;
 851         rs.sr_flags = REP_CTRLS_MUSTBEFREED;
 852         csns[0] = ri->ri_csn;
 853         BER_BVZERO( &csns[1] );
 854         slap_compose_sync_cookie( op, &cookie, csns, so->s_rid, slap_serverID ? slap_serverID : -1 );
 855
 856 #ifdef LDAP_DEBUG
 857         if ( so->s_sid > 0 ) {
 858                 Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: to=%03x, cookie=%s\n",
 859                         so->s_sid, cookie.bv_val, 0 );
 860         } else {
 861                 Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: cookie=%s\n",
 862                         cookie.bv_val, 0, 0 );
 863         }
 864 #endif
 865
 866         e_uuid.e_attrs = &a_uuid;
 867         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 868         a_uuid.a_nvals = &ri->ri_uuid;
 869         rs.sr_err = syncprov_state_ctrl( op, &rs, &e_uuid,
 870                 mode, rs.sr_ctrls, 0, 1, &cookie );
 871         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
 872
 873         rs.sr_entry = &e_uuid;
 874         if ( mode == LDAP_SYNC_ADD || mode == LDAP_SYNC_MODIFY ) {
 875                 e_uuid = *ri->ri_e;
 876                 e_uuid.e_private = NULL;
 877         }
 878
 879         switch( mode ) {
 880         case LDAP_SYNC_ADD:
 881                 if ( ri->ri_isref && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 882                         rs.sr_ref = get_entry_referrals( op, rs.sr_entry );
 883                         rs.sr_err = send_search_reference( op, &rs );
 884                         ber_bvarray_free( rs.sr_ref );
 885                         break;
 886                 }
 887                 /* fallthru */
 888         case LDAP_SYNC_MODIFY:
 889                 rs.sr_attrs = op->ors_attrs;
 890                 rs.sr_err = send_search_entry( op, &rs );
 891                 break;
 892         case LDAP_SYNC_DELETE:
 893                 e_uuid.e_attrs = NULL;
 894                 e_uuid.e_name = ri->ri_dn;
 895                 e_uuid.e_nname = ri->ri_ndn;
 896                 if ( ri->ri_isref && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 897                         struct berval bv = BER_BVNULL;
 898                         rs.sr_ref = &bv;
 899                         rs.sr_err = send_search_reference( op, &rs );
 900                 } else {
 901                         rs.sr_err = send_search_entry( op, &rs );
 902                 }
 903                 break;
 904         default:
 905                 assert(0);
 906         }
 907         return rs.sr_err;
 908 }
 909
 910 static void
 911 syncprov_qstart( syncops *so );
 912
 913 /* Play back queued responses */
 914 static int
 915 syncprov_qplay( Operation *op, syncops *so )
 916 {
 917         slap_overinst *on = LDAP_SLIST_FIRST(&so->s_op->o_extra)->oe_key;
 918         syncres *sr;
 919         int rc = 0;
 920
 921         do {
 922                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 923                 sr = so->s_res;
 924                 /* Exit loop with mutex held */
 925                 if ( !sr )
 926                         break;
 927                 so->s_res = sr->s_next;
 928                 if ( !so->s_res )
 929                         so->s_restail = NULL;
 930                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 931
 932                 if ( !so->s_op->o_abandon ) {
 933
 934                         if ( sr->s_mode == LDAP_SYNC_NEW_COOKIE ) {
 935                                 SlapReply rs = { REP_INTERMEDIATE };
 936
 937                                 rc = syncprov_sendinfo( op, &rs, LDAP_TAG_SYNC_NEW_COOKIE,
 938                                         &sr->s_info->ri_cookie, 0, NULL, 0 );
 939                         } else {
 940                                 rc = syncprov_sendresp( op, sr->s_info, so, sr->s_mode );
 941                         }
 942                 }
 943
 944                 free_resinfo( sr );
 945                 ch_free( sr );
 946
 947                 if ( so->s_op->o_abandon )
 948                         continue;
 949
 950                 /* Exit loop with mutex held */
 951                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 952                 break;
 953
 954         } while (1);
 955
 956         /* We now only send one change at a time, to prevent one
 957          * psearch from hogging all the CPU. Resubmit this task if
 958          * there are more responses queued and no errors occurred.
 959          */
 960
 961         if ( rc == 0 && so->s_res ) {
 962                 syncprov_qstart( so );
 963         } else {
 964                 so->s_flags ^= PS_TASK_QUEUED;
 965         }
 966
 967         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 968         return rc;
 969 }
 970
 971 /* task for playing back queued responses */
 972 static void *
 973 syncprov_qtask( void *ctx, void *arg )
 974 {
 975         syncops *so = arg;
 976         OperationBuffer opbuf;
 977         Operation *op;
 978         BackendDB be;
 979         int rc;
 980
 981         op = &opbuf.ob_op;
 982         *op = *so->s_op;
 983         op->o_hdr = &opbuf.ob_hdr;
 984         op->o_controls = opbuf.ob_controls;
 985         memset( op->o_controls, 0, sizeof(opbuf.ob_controls) );
 986         op->o_sync = SLAP_CONTROL_IGNORED;
 987
 988         *op->o_hdr = *so->s_op->o_hdr;
 989
 990         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx, 1);
 991         op->o_tmpmfuncs = &slap_sl_mfuncs;
 992         op->o_threadctx = ctx;
 993
 994         /* syncprov_qplay expects a fake db */
 995         be = *so->s_op->o_bd;
 996         be.be_flags |= SLAP_DBFLAG_OVERLAY;
 997         op->o_bd = &be;
 998         LDAP_SLIST_FIRST(&op->o_extra) = NULL;
 999         op->o_callback = NULL;
1000
1001         rc = syncprov_qplay( op, so );
1002
1003         /* decrement use count... */
1004         syncprov_free_syncop( so, 1 );
1005
1006         return NULL;
1007 }
1008
1009 /* Start the task to play back queued psearch responses */
1010 static void
1011 syncprov_qstart( syncops *so )
1012 {
1013         so->s_flags |= PS_TASK_QUEUED;
1014         so->s_inuse++;
1015         ldap_pvt_thread_pool_submit( &connection_pool,
1016                 syncprov_qtask, so );
1017 }
1018
1019 /* Queue a persistent search response */
1020 static int
1021 syncprov_qresp( opcookie *opc, syncops *so, int mode )
1022 {
1023         syncres *sr;
1024         resinfo *ri;
1025         int srsize;
1026         struct berval csn = opc->sctxcsn;
1027
1028         sr = ch_malloc( sizeof( syncres ));
1029         sr->s_next = NULL;
1030         sr->s_mode = mode;
1031         if ( !opc->ssres.s_info ) {
1032
1033                 srsize = sizeof( resinfo );
1034                 if ( csn.bv_len )
1035                         srsize += csn.bv_len + 1;
1036
1037                 if ( opc->se ) {
1038                         Attribute *a;
1039                         ri = ch_malloc( srsize );
1040                         ri->ri_dn = opc->se->e_name;
1041                         ri->ri_ndn = opc->se->e_nname;
1042                         a = attr_find( opc->se->e_attrs, slap_schema.si_ad_entryUUID );
1043                         if ( a )
1044                                 ri->ri_uuid = a->a_nvals[0];
1045                         else
1046                                 ri->ri_uuid.bv_len = 0;
1047                         if ( csn.bv_len ) {
1048                                 ri->ri_csn.bv_val = (char *)(ri + 1);
1049                                 ri->ri_csn.bv_len = csn.bv_len;
1050                                 memcpy( ri->ri_csn.bv_val, csn.bv_val, csn.bv_len );
1051                                 ri->ri_csn.bv_val[csn.bv_len] = '\0';
1052                         } else {
1053                                 ri->ri_csn.bv_val = NULL;
1054                         }
1055                 } else {
1056                         srsize += opc->suuid.bv_len +
1057                                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1;
1058                         ri = ch_malloc( srsize );
1059                         ri->ri_dn.bv_val = (char *)(ri + 1);
1060                         ri->ri_dn.bv_len = opc->sdn.bv_len;
1061                         ri->ri_ndn.bv_val = lutil_strcopy( ri->ri_dn.bv_val,
1062                                 opc->sdn.bv_val ) + 1;
1063                         ri->ri_ndn.bv_len = opc->sndn.bv_len;
1064                         ri->ri_uuid.bv_val = lutil_strcopy( ri->ri_ndn.bv_val,
1065                                 opc->sndn.bv_val ) + 1;
1066                         ri->ri_uuid.bv_len = opc->suuid.bv_len;
1067                         AC_MEMCPY( ri->ri_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1068                         if ( csn.bv_len ) {
1069                                 ri->ri_csn.bv_val = ri->ri_uuid.bv_val + ri->ri_uuid.bv_len;
1070                                 memcpy( ri->ri_csn.bv_val, csn.bv_val, csn.bv_len );
1071                                 ri->ri_csn.bv_val[csn.bv_len] = '\0';
1072                         } else {
1073                                 ri->ri_csn.bv_val = NULL;
1074                         }
1075                 }
1076                 ri->ri_list = &opc->ssres;
1077                 ri->ri_e = opc->se;
1078                 ri->ri_csn.bv_len = csn.bv_len;
1079                 ri->ri_isref = opc->sreference;
1080                 BER_BVZERO( &ri->ri_cookie );
1081                 ldap_pvt_thread_mutex_init( &ri->ri_mutex );
1082                 opc->se = NULL;
1083                 opc->ssres.s_info = ri;
1084         }
1085         ri = opc->ssres.s_info;
1086         sr->s_info = ri;
1087         ldap_pvt_thread_mutex_lock( &ri->ri_mutex );
1088         sr->s_rilist = ri->ri_list;
1089         ri->ri_list = sr;
1090         if ( mode == LDAP_SYNC_NEW_COOKIE && BER_BVISNULL( &ri->ri_cookie )) {
1091                 syncprov_info_t *si = opc->son->on_bi.bi_private;
1092
1093                 slap_compose_sync_cookie( NULL, &ri->ri_cookie, si->si_ctxcsn,
1094                         so->s_rid, slap_serverID ? slap_serverID : -1);
1095         }
1096         ldap_pvt_thread_mutex_unlock( &ri->ri_mutex );
1097
1098         ldap_pvt_thread_mutex_lock( &so->s_mutex );
1099         if ( !so->s_res ) {
1100                 so->s_res = sr;
1101         } else {
1102                 so->s_restail->s_next = sr;
1103         }
1104         so->s_restail = sr;
1105
1106         /* If the base of the psearch was modified, check it next time round */
1107         if ( so->s_flags & PS_WROTE_BASE ) {
1108                 so->s_flags ^= PS_WROTE_BASE;
1109                 so->s_flags |= PS_FIND_BASE;
1110         }
1111         if (( so->s_flags & (PS_IS_DETACHED|PS_TASK_QUEUED)) == PS_IS_DETACHED ) {
1112                 syncprov_qstart( so );
1113         }
1114         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
1115         return LDAP_SUCCESS;
1116 }
1117
1118 static int
1119 syncprov_drop_psearch( syncops *so, int lock )
1120 {
1121         if ( so->s_flags & PS_IS_DETACHED ) {
1122                 if ( lock )
1123                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
1124                 so->s_op->o_conn->c_n_ops_executing--;
1125                 so->s_op->o_conn->c_n_ops_completed++;
1126                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, Operation,
1127                         o_next );
1128                 if ( lock )
1129                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
1130         }
1131         return syncprov_free_syncop( so, 0 );
1132 }
1133
1134 static int
1135 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
1136 {
1137         slap_callback *sc = op->o_callback;
1138         op->o_callback = sc->sc_next;
1139         syncprov_drop_psearch( sc->sc_private, 0 );
1140         op->o_tmpfree( sc, op->o_tmpmemctx );
1141         return 0;
1142 }
1143
1144 static int
1145 syncprov_op_abandon( Operation *op, SlapReply *rs )
1146 {
1147         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1148         syncprov_info_t         *si = on->on_bi.bi_private;
1149         syncops *so, **sop;
1150
1151         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1152         for ( sop=&si->si_ops; (so = *sop); sop = &(*sop)->s_next ) {
1153                 if ( so->s_op->o_connid == op->o_connid &&
1154                         so->s_op->o_msgid == op->orn_msgid ) {
1155                                 so->s_op->o_abandon = 1;
1156                                 *sop = so->s_next;
1157                                 break;
1158                 }
1159         }
1160         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1161         if ( so ) {
1162                 /* Is this really a Cancel exop? */
1163                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
1164                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
1165                         rs->sr_err = LDAP_CANCELLED;
1166                         send_ldap_result( so->s_op, rs );
1167                         if ( so->s_flags & PS_IS_DETACHED ) {
1168                                 slap_callback *cb;
1169                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
1170                                 cb->sc_cleanup = syncprov_ab_cleanup;
1171                                 cb->sc_next = op->o_callback;
1172                                 cb->sc_private = so;
1173                                 op->o_callback = cb;
1174                                 return SLAP_CB_CONTINUE;
1175                         }
1176                 }
1177                 syncprov_drop_psearch( so, 0 );
1178         }
1179         return SLAP_CB_CONTINUE;
1180 }
1181
1182 /* Find which persistent searches are affected by this operation */
1183 static void
1184 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
1185 {
1186         slap_overinst *on = opc->son;
1187         syncprov_info_t         *si = on->on_bi.bi_private;
1188
1189         fbase_cookie fc;
1190         syncops **pss;
1191         Entry *e = NULL;
1192         Attribute *a;
1193         int rc, gonext;
1194         struct berval newdn;
1195         int freefdn = 0;
1196         BackendDB *b0 = op->o_bd, db;
1197
1198         fc.fdn = &op->o_req_ndn;
1199         /* compute new DN */
1200         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1201                 struct berval pdn;
1202                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
1203                 else dnParent( fc.fdn, &pdn );
1204                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
1205                 fc.fdn = &newdn;
1206                 freefdn = 1;
1207         }
1208         if ( op->o_tag != LDAP_REQ_ADD ) {
1209                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1210                         db = *op->o_bd;
1211                         op->o_bd = &db;
1212                 }
1213                 rc = overlay_entry_get_ov( op, fc.fdn, NULL, NULL, 0, &e, on );
1214                 /* If we're sending responses now, make a copy and unlock the DB */
1215                 if ( e && !saveit ) {
1216                         if ( !opc->se )
1217                                 opc->se = entry_dup( e );
1218                         overlay_entry_release_ov( op, e, 0, on );
1219                         e = opc->se;
1220                 }
1221                 if ( rc ) {
1222                         op->o_bd = b0;
1223                         return;
1224                 }
1225         } else {
1226                 e = op->ora_e;
1227                 if ( !saveit ) {
1228                         if ( !opc->se )
1229                                 opc->se = entry_dup( e );
1230                         e = opc->se;
1231                 }
1232         }
1233
1234         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1235                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1236                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1237                 opc->sreference = is_entry_referral( e );
1238                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1239                 if ( a )
1240                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1241         } else if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1242                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1243                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1244                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1245                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1246         }
1247
1248         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1249         for (pss = &si->si_ops; *pss; pss = gonext ? &(*pss)->s_next : pss)
1250         {
1251                 Operation op2;
1252                 Opheader oh;
1253                 syncmatches *sm;
1254                 int found = 0;
1255                 syncops *snext, *ss = *pss;
1256
1257                 gonext = 1;
1258                 if ( ss->s_op->o_abandon )
1259                         continue;
1260
1261                 /* Don't send ops back to the originator */
1262                 if ( opc->osid > 0 && opc->osid == ss->s_sid ) {
1263                         Debug( LDAP_DEBUG_SYNC, "syncprov_matchops: skipping original sid %03x\n",
1264                                 opc->osid, 0, 0 );
1265                         continue;
1266                 }
1267
1268                 /* Don't send ops back to the messenger */
1269                 if ( opc->rsid > 0 && opc->rsid == ss->s_sid ) {
1270                         Debug( LDAP_DEBUG_SYNC, "syncprov_matchops: skipping relayed sid %03x\n",
1271                                 opc->rsid, 0, 0 );
1272                         continue;
1273                 }
1274
1275                 /* validate base */
1276                 fc.fss = ss;
1277                 fc.fbase = 0;
1278                 fc.fscope = 0;
1279
1280                 /* If the base of the search is missing, signal a refresh */
1281                 rc = syncprov_findbase( op, &fc );
1282                 if ( rc != LDAP_SUCCESS ) {
1283                         SlapReply rs = {REP_RESULT};
1284                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1285                                 "search base has changed" );
1286                         snext = ss->s_next;
1287                         if ( syncprov_drop_psearch( ss, 1 ) )
1288                                 *pss = snext;
1289                         gonext = 0;
1290                         continue;
1291                 }
1292
1293                 /* If we're sending results now, look for this op in old matches */
1294                 if ( !saveit ) {
1295                         syncmatches *old;
1296
1297                         /* Did we modify the search base? */
1298                         if ( dn_match( &op->o_req_ndn, &ss->s_base )) {
1299                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1300                                 ss->s_flags |= PS_WROTE_BASE;
1301                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1302                         }
1303
1304                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1305                                 old=sm, sm=sm->sm_next ) {
1306                                 if ( sm->sm_op == ss ) {
1307                                         found = 1;
1308                                         old->sm_next = sm->sm_next;
1309                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1310                                         break;
1311                                 }
1312                         }
1313                 }
1314
1315                 if ( fc.fscope ) {
1316                         ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1317                         op2 = *ss->s_op;
1318                         oh = *op->o_hdr;
1319                         oh.oh_conn = ss->s_op->o_conn;
1320                         oh.oh_connid = ss->s_op->o_connid;
1321                         op2.o_bd = op->o_bd->bd_self;
1322                         op2.o_hdr = &oh;
1323                         op2.o_extra = op->o_extra;
1324                         op2.o_callback = NULL;
1325                         if (ss->s_flags & PS_FIX_FILTER) {
1326                                 /* Skip the AND/GE clause that we stuck on in front. We
1327                                    would lose deletes/mods that happen during the refresh
1328                                    phase otherwise (ITS#6555) */
1329                                 op2.ors_filter = ss->s_op->ors_filter->f_and->f_next;
1330                         }
1331                         rc = test_filter( &op2, e, op2.ors_filter );
1332                         ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1333                 }
1334
1335                 Debug( LDAP_DEBUG_TRACE, "syncprov_matchops: sid %03x fscope %d rc %d\n",
1336                         ss->s_sid, fc.fscope, rc );
1337
1338                 /* check if current o_req_dn is in scope and matches filter */
1339                 if ( fc.fscope && rc == LDAP_COMPARE_TRUE ) {
1340                         if ( saveit ) {
1341                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1342                                 sm->sm_next = opc->smatches;
1343                                 sm->sm_op = ss;
1344                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1345                                 ++ss->s_inuse;
1346                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1347                                 opc->smatches = sm;
1348                         } else {
1349                                 /* if found send UPDATE else send ADD */
1350                                 syncprov_qresp( opc, ss,
1351                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD );
1352                         }
1353                 } else if ( !saveit && found ) {
1354                         /* send DELETE */
1355                         syncprov_qresp( opc, ss, LDAP_SYNC_DELETE );
1356                 } else if ( !saveit ) {
1357                         syncprov_qresp( opc, ss, LDAP_SYNC_NEW_COOKIE );
1358                 }
1359                 if ( !saveit && found ) {
1360                         /* Decrement s_inuse, was incremented when called
1361                          * with saveit == TRUE
1362                          */
1363                         snext = ss->s_next;
1364                         if ( syncprov_free_syncop( ss, 0 ) ) {
1365                                 *pss = snext;
1366                                 gonext = 0;
1367                         }
1368                 }
1369         }
1370         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1371
1372         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1373                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1374                         op->o_bd = &db;
1375                 }
1376                 if ( saveit )
1377                         overlay_entry_release_ov( op, e, 0, on );
1378                 op->o_bd = b0;
1379         }
1380         if ( !saveit ) {
1381                 if ( opc->ssres.s_info )
1382                         free_resinfo( &opc->ssres );
1383                 else if ( opc->se )
1384                         entry_free( opc->se );
1385         }
1386         if ( freefdn ) {
1387                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1388         }
1389         op->o_bd = b0;
1390 }
1391
1392 static int
1393 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1394 {
1395         slap_callback *cb = op->o_callback;
1396         opcookie *opc = cb->sc_private;
1397         slap_overinst *on = opc->son;
1398         syncprov_info_t         *si = on->on_bi.bi_private;
1399         syncmatches *sm, *snext;
1400         modtarget *mt;
1401
1402         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1403         if ( si->si_active )
1404                 si->si_active--;
1405         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1406
1407         for (sm = opc->smatches; sm; sm=snext) {
1408                 snext = sm->sm_next;
1409                 syncprov_free_syncop( sm->sm_op, 1 );
1410                 op->o_tmpfree( sm, op->o_tmpmemctx );
1411         }
1412
1413         /* Remove op from lock table */
1414         mt = opc->smt;
1415         if ( mt ) {
1416                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1417                 mt->mt_mods = mt->mt_mods->mi_next;
1418                 /* If there are more, promote the next one */
1419                 if ( mt->mt_mods ) {
1420                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1421                 } else {
1422                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1423                         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1424                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1425                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1426                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1427                         ch_free( mt->mt_dn.bv_val );
1428                         ch_free( mt );
1429                 }
1430         }
1431         if ( !BER_BVISNULL( &opc->suuid ))
1432                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1433         if ( !BER_BVISNULL( &opc->sndn ))
1434                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1435         if ( !BER_BVISNULL( &opc->sdn ))
1436                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1437         op->o_callback = cb->sc_next;
1438         op->o_tmpfree(cb, op->o_tmpmemctx);
1439
1440         return 0;
1441 }
1442
1443 static void
1444 syncprov_checkpoint( Operation *op, slap_overinst *on )
1445 {
1446         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
1447         Modifications mod;
1448         Operation opm;
1449         SlapReply rsm = {REP_RESULT};
1450         slap_callback cb = {0};
1451         BackendDB be;
1452         BackendInfo *bi;
1453
1454 #ifdef CHECK_CSN
1455         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1456
1457         int i;
1458         for ( i=0; i<si->si_numcsns; i++ ) {
1459                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1460         }
1461 #endif
1462         mod.sml_numvals = si->si_numcsns;
1463         mod.sml_values = si->si_ctxcsn;
1464         mod.sml_nvalues = NULL;
1465         mod.sml_desc = slap_schema.si_ad_contextCSN;
1466         mod.sml_op = LDAP_MOD_REPLACE;
1467         mod.sml_flags = SLAP_MOD_INTERNAL;
1468         mod.sml_next = NULL;
1469
1470         cb.sc_response = slap_null_cb;
1471         opm = *op;
1472         opm.o_tag = LDAP_REQ_MODIFY;
1473         opm.o_callback = &cb;
1474         opm.orm_modlist = &mod;
1475         opm.orm_no_opattrs = 1;
1476         if ( SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1477                 be = *on->on_info->oi_origdb;
1478                 opm.o_bd = &be;
1479         }
1480         opm.o_req_dn = si->si_contextdn;
1481         opm.o_req_ndn = si->si_contextdn;
1482         bi = opm.o_bd->bd_info;
1483         opm.o_bd->bd_info = on->on_info->oi_orig;
1484         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1485         opm.o_no_schema_check = 1;
1486         opm.o_bd->be_modify( &opm, &rsm );
1487
1488         if ( rsm.sr_err == LDAP_NO_SUCH_OBJECT &&
1489                 SLAP_SYNC_SUBENTRY( opm.o_bd )) {
1490                 const char      *text;
1491                 char txtbuf[SLAP_TEXT_BUFLEN];
1492                 size_t textlen = sizeof txtbuf;
1493                 Entry *e = slap_create_context_csn_entry( opm.o_bd, NULL );
1494                 rs_reinit( &rsm, REP_RESULT );
1495                 slap_mods2entry( &mod, &e, 0, 1, &text, txtbuf, textlen);
1496                 opm.ora_e = e;
1497                 opm.o_bd->be_add( &opm, &rsm );
1498                 if ( e == opm.ora_e )
1499                         be_entry_release_w( &opm, opm.ora_e );
1500         }
1501         opm.o_bd->bd_info = bi;
1502
1503         if ( mod.sml_next != NULL ) {
1504                 slap_mods_free( mod.sml_next, 1 );
1505         }
1506 #ifdef CHECK_CSN
1507         for ( i=0; i<si->si_numcsns; i++ ) {
1508                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1509         }
1510 #endif
1511 }
1512
1513 static void
1514 syncprov_add_slog( Operation *op )
1515 {
1516         opcookie *opc = op->o_callback->sc_private;
1517         slap_overinst *on = opc->son;
1518         syncprov_info_t         *si = on->on_bi.bi_private;
1519         sessionlog *sl;
1520         slog_entry *se;
1521
1522         sl = si->si_logs;
1523         {
1524                 if ( BER_BVISEMPTY( &op->o_csn ) ) {
1525                         /* During the syncrepl refresh phase we can receive operations
1526                          * without a csn.  We cannot reliably determine the consumers
1527                          * state with respect to such operations, so we ignore them and
1528                          * wipe out anything in the log if we see them.
1529                          */
1530                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1531                         while ( se = sl->sl_head ) {
1532                                 sl->sl_head = se->se_next;
1533                                 ch_free( se );
1534                         }
1535                         sl->sl_tail = NULL;
1536                         sl->sl_num = 0;
1537                         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1538                         return;
1539                 }
1540
1541                 /* Allocate a record. UUIDs are not NUL-terminated. */
1542                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1543                         op->o_csn.bv_len + 1 );
1544                 se->se_next = NULL;
1545                 se->se_tag = op->o_tag;
1546
1547                 se->se_uuid.bv_val = (char *)(&se[1]);
1548                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1549                 se->se_uuid.bv_len = opc->suuid.bv_len;
1550
1551                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1552                 AC_MEMCPY( se->se_csn.bv_val, op->o_csn.bv_val, op->o_csn.bv_len );
1553                 se->se_csn.bv_val[op->o_csn.bv_len] = '\0';
1554                 se->se_csn.bv_len = op->o_csn.bv_len;
1555                 se->se_sid = slap_parse_csn_sid( &se->se_csn );
1556
1557                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1558                 if ( sl->sl_head ) {
1559                         /* Keep the list in csn order. */
1560                         if ( ber_bvcmp( &sl->sl_tail->se_csn, &se->se_csn ) <= 0 ) {
1561                                 sl->sl_tail->se_next = se;
1562                                 sl->sl_tail = se;
1563                         } else {
1564                                 slog_entry **sep;
1565
1566                                 for ( sep = &sl->sl_head; *sep; sep = &(*sep)->se_next ) {
1567                                         if ( ber_bvcmp( &se->se_csn, &(*sep)->se_csn ) < 0 ) {
1568                                                 se->se_next = *sep;
1569                                                 *sep = se;
1570                                                 break;
1571                                         }
1572                                 }
1573                         }
1574                 } else {
1575                         sl->sl_head = se;
1576                         sl->sl_tail = se;
1577                         if ( !sl->sl_mincsn ) {
1578                                 sl->sl_numcsns = 1;
1579                                 sl->sl_mincsn = ch_malloc( 2*sizeof( struct berval ));
1580                                 sl->sl_sids = ch_malloc( sizeof( int ));
1581                                 sl->sl_sids[0] = se->se_sid;
1582                                 ber_dupbv( sl->sl_mincsn, &se->se_csn );
1583                                 BER_BVZERO( &sl->sl_mincsn[1] );
1584                         }
1585                 }
1586                 sl->sl_num++;
1587                 while ( sl->sl_num > sl->sl_size ) {
1588                         int i, j;
1589                         se = sl->sl_head;
1590                         sl->sl_head = se->se_next;
1591                         for ( i=0; i<sl->sl_numcsns; i++ )
1592                                 if ( sl->sl_sids[i] >= se->se_sid )
1593                                         break;
1594                         if  ( i == sl->sl_numcsns || sl->sl_sids[i] != se->se_sid ) {
1595                                 slap_insert_csn_sids( (struct sync_cookie *)sl,
1596                                         i, se->se_sid, &se->se_csn );
1597                         } else {
1598                                 ber_bvreplace( &sl->sl_mincsn[i], &se->se_csn );
1599                         }
1600                         ch_free( se );
1601                         sl->sl_num--;
1602                 }
1603                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1604         }
1605 }
1606
1607 /* Just set a flag if we found the matching entry */
1608 static int
1609 playlog_cb( Operation *op, SlapReply *rs )
1610 {
1611         if ( rs->sr_type == REP_SEARCH ) {
1612                 op->o_callback->sc_private = (void *)1;
1613         }
1614         return rs->sr_err;
1615 }
1616
1617 /* enter with sl->sl_mutex locked, release before returning */
1618 static void
1619 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1620         sync_control *srs, BerVarray ctxcsn, int numcsns, int *sids )
1621 {
1622         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1623         slog_entry *se;
1624         int i, j, ndel, num, nmods, mmods;
1625         char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
1626         BerVarray uuids;
1627         struct berval delcsn[2];
1628
1629         if ( !sl->sl_num ) {
1630                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1631                 return;
1632         }
1633
1634         num = sl->sl_num;
1635         i = 0;
1636         nmods = 0;
1637
1638         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1639                 num * UUID_LEN, op->o_tmpmemctx );
1640         uuids[0].bv_val = (char *)(uuids + num + 1);
1641
1642         delcsn[0].bv_len = 0;
1643         delcsn[0].bv_val = cbuf;
1644         BER_BVZERO(&delcsn[1]);
1645
1646         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1647          * and everything else at the end. Do this first so we can
1648          * unlock the list mutex.
1649          */
1650         Debug( LDAP_DEBUG_SYNC, "srs csn %s\n",
1651                 srs->sr_state.ctxcsn[0].bv_val, 0, 0 );
1652         for ( se=sl->sl_head; se; se=se->se_next ) {
1653                 int k;
1654                 Debug( LDAP_DEBUG_SYNC, "log csn %s\n", se->se_csn.bv_val, 0, 0 );
1655                 ndel = 1;
1656                 for ( k=0; k<srs->sr_state.numcsns; k++ ) {
1657                         if ( se->se_sid == srs->sr_state.sids[k] ) {
1658                                 ndel = ber_bvcmp( &se->se_csn, &srs->sr_state.ctxcsn[k] );
1659                                 break;
1660                         }
1661                 }
1662                 if ( ndel <= 0 ) {
1663                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too old\n", ndel, 0, 0 );
1664                         continue;
1665                 }
1666                 ndel = 0;
1667                 for ( k=0; k<numcsns; k++ ) {
1668                         if ( se->se_sid == sids[k] ) {
1669                                 ndel = ber_bvcmp( &se->se_csn, &ctxcsn[k] );
1670                                 break;
1671                         }
1672                 }
1673                 if ( ndel > 0 ) {
1674                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too new\n", ndel, 0, 0 );
1675                         break;
1676                 }
1677                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1678                         j = i;
1679                         i++;
1680                         AC_MEMCPY( cbuf, se->se_csn.bv_val, se->se_csn.bv_len );
1681                         delcsn[0].bv_len = se->se_csn.bv_len;
1682                         delcsn[0].bv_val[delcsn[0].bv_len] = '\0';
1683                 } else {
1684                         if ( se->se_tag == LDAP_REQ_ADD )
1685                                 continue;
1686                         nmods++;
1687                         j = num - nmods;
1688                 }
1689                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1690                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1691                 uuids[j].bv_len = UUID_LEN;
1692         }
1693         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1694
1695         ndel = i;
1696
1697         /* Zero out unused slots */
1698         for ( i=ndel; i < num - nmods; i++ )
1699                 uuids[i].bv_len = 0;
1700
1701         /* Mods must be validated to see if they belong in this delete set.
1702          */
1703
1704         mmods = nmods;
1705         /* Strip any duplicates */
1706         for ( i=0; i<nmods; i++ ) {
1707                 for ( j=0; j<ndel; j++ ) {
1708                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1709                                 uuids[num - 1 - i].bv_len = 0;
1710                                 mmods --;
1711                                 break;
1712                         }
1713                 }
1714                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1715                 for ( j=0; j<i; j++ ) {
1716                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1717                                 uuids[num - 1 - i].bv_len = 0;
1718                                 mmods --;
1719                                 break;
1720                         }
1721                 }
1722         }
1723
1724         if ( mmods ) {
1725                 Operation fop;
1726                 int rc;
1727                 Filter mf, af;
1728                 AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
1729                 slap_callback cb = {0};
1730
1731                 fop = *op;
1732
1733                 fop.o_sync_mode = 0;
1734                 fop.o_callback = &cb;
1735                 fop.ors_limit = NULL;
1736                 fop.ors_tlimit = SLAP_NO_LIMIT;
1737                 fop.ors_attrs = slap_anlist_all_attributes;
1738                 fop.ors_attrsonly = 0;
1739                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1740
1741                 af.f_choice = LDAP_FILTER_AND;
1742                 af.f_next = NULL;
1743                 af.f_and = &mf;
1744                 mf.f_choice = LDAP_FILTER_EQUALITY;
1745                 mf.f_ava = &eq;
1746                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1747                 mf.f_next = fop.ors_filter;
1748
1749                 fop.ors_filter = &af;
1750
1751                 cb.sc_response = playlog_cb;
1752                 fop.o_bd->bd_info = (BackendInfo *)on->on_info;
1753
1754                 for ( i=ndel; i<num; i++ ) {
1755                   if ( uuids[i].bv_len != 0 ) {
1756                         SlapReply frs = { REP_RESULT };
1757
1758                         mf.f_av_value = uuids[i];
1759                         cb.sc_private = NULL;
1760                         fop.ors_slimit = 1;
1761                         rc = fop.o_bd->be_search( &fop, &frs );
1762
1763                         /* If entry was not found, add to delete list */
1764                         if ( !cb.sc_private ) {
1765                                 uuids[ndel++] = uuids[i];
1766                         }
1767                   }
1768                 }
1769                 fop.o_bd->bd_info = (BackendInfo *)on;
1770         }
1771         if ( ndel ) {
1772                 struct berval cookie;
1773
1774                 if ( delcsn[0].bv_len ) {
1775                         slap_compose_sync_cookie( op, &cookie, delcsn, srs->sr_state.rid,
1776                                 slap_serverID ? slap_serverID : -1 );
1777
1778                         Debug( LDAP_DEBUG_SYNC, "syncprov_playlog: cookie=%s\n", cookie.bv_val, 0, 0 );
1779                 }
1780
1781                 uuids[ndel].bv_val = NULL;
1782                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET,
1783                         delcsn[0].bv_len ? &cookie : NULL, 0, uuids, 1 );
1784                 if ( delcsn[0].bv_len ) {
1785                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1786                 }
1787         }
1788         op->o_tmpfree( uuids, op->o_tmpmemctx );
1789 }
1790
1791 static int
1792 syncprov_op_response( Operation *op, SlapReply *rs )
1793 {
1794         opcookie *opc = op->o_callback->sc_private;
1795         slap_overinst *on = opc->son;
1796         syncprov_info_t         *si = on->on_bi.bi_private;
1797         syncmatches *sm;
1798
1799         if ( rs->sr_err == LDAP_SUCCESS )
1800         {
1801                 struct berval maxcsn;
1802                 char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
1803                 int do_check = 0, have_psearches, foundit, csn_changed = 0;
1804
1805                 ldap_pvt_thread_mutex_lock( &si->si_resp_mutex );
1806
1807                 /* Update our context CSN */
1808                 cbuf[0] = '\0';
1809                 maxcsn.bv_val = cbuf;
1810                 maxcsn.bv_len = sizeof(cbuf);
1811                 ldap_pvt_thread_rdwr_wlock( &si->si_csn_rwlock );
1812
1813                 slap_get_commit_csn( op, &maxcsn, &foundit );
1814                 if ( BER_BVISEMPTY( &maxcsn ) && SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1815                         /* syncrepl queues the CSN values in the db where
1816                          * it is configured , not where the changes are made.
1817                          * So look for a value in the glue db if we didn't
1818                          * find any in this db.
1819                          */
1820                         BackendDB *be = op->o_bd;
1821                         op->o_bd = select_backend( &be->be_nsuffix[0], 1);
1822                         maxcsn.bv_val = cbuf;
1823                         maxcsn.bv_len = sizeof(cbuf);
1824                         slap_get_commit_csn( op, &maxcsn, &foundit );
1825                         op->o_bd = be;
1826                 }
1827                 if ( !BER_BVISEMPTY( &maxcsn ) ) {
1828                         int i, sid;
1829 #ifdef CHECK_CSN
1830                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1831                         assert( !syn->ssyn_validate( syn, &maxcsn ));
1832 #endif
1833                         sid = slap_parse_csn_sid( &maxcsn );
1834                         for ( i=0; i<si->si_numcsns; i++ ) {
1835                                 if ( sid < si->si_sids[i] )
1836                                         break;
1837                                 if ( sid == si->si_sids[i] ) {
1838                                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn[i] ) > 0 ) {
1839                                                 ber_bvreplace( &si->si_ctxcsn[i], &maxcsn );
1840                                                 csn_changed = 1;
1841                                         }
1842                                         break;
1843                                 }
1844                         }
1845                         /* It's a new SID for us */
1846                         if ( i == si->si_numcsns || sid != si->si_sids[i] ) {
1847                                 slap_insert_csn_sids((struct sync_cookie *)&(si->si_ctxcsn),
1848                                         i, sid, &maxcsn );
1849                                 csn_changed = 1;
1850                         }
1851                 }
1852
1853                 /* Don't do any processing for consumer contextCSN updates */
1854                 if ( op->o_dont_replicate ) {
1855                         if ( op->o_tag == LDAP_REQ_MODIFY &&
1856                                 op->orm_modlist->sml_op == LDAP_MOD_REPLACE &&
1857                                 op->orm_modlist->sml_desc == slap_schema.si_ad_contextCSN ) {
1858                         /* Catch contextCSN updates from syncrepl. We have to look at
1859                          * all the attribute values, as there may be more than one csn
1860                          * that changed, and only one can be passed in the csn queue.
1861                          */
1862                         Modifications *mod = op->orm_modlist;
1863                         unsigned i;
1864                         int j, sid;
1865
1866                         for ( i=0; i<mod->sml_numvals; i++ ) {
1867                                 sid = slap_parse_csn_sid( &mod->sml_values[i] );
1868                                 for ( j=0; j<si->si_numcsns; j++ ) {
1869                                         if ( sid < si->si_sids[j] )
1870                                                 break;
1871                                         if ( sid == si->si_sids[j] ) {
1872                                                 if ( ber_bvcmp( &mod->sml_values[i], &si->si_ctxcsn[j] ) > 0 ) {
1873                                                         ber_bvreplace( &si->si_ctxcsn[j], &mod->sml_values[i] );
1874                                                         csn_changed = 1;
1875                                                 }
1876                                                 break;
1877                                         }
1878                                 }
1879
1880                                 if ( j == si->si_numcsns || sid != si->si_sids[j] ) {
1881                                         slap_insert_csn_sids( (struct sync_cookie *)&si->si_ctxcsn,
1882                                                 j, sid, &mod->sml_values[i] );
1883                                         csn_changed = 1;
1884                                 }
1885                         }
1886                         if ( csn_changed )
1887                                 si->si_dirty = 0;
1888                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1889
1890                         if ( csn_changed ) {
1891                                 syncops *ss;
1892                                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1893                                 for ( ss = si->si_ops; ss; ss = ss->s_next ) {
1894                                         if ( ss->s_op->o_abandon )
1895                                                 continue;
1896                                         /* Send the updated csn to all syncrepl consumers,
1897                                          * including the server from which it originated.
1898                                          * The syncrepl consumer and syncprov provider on
1899                                          * the originating server may be configured to store
1900                                          * their csn values in different entries.
1901                                          */
1902                                         syncprov_qresp( opc, ss, LDAP_SYNC_NEW_COOKIE );
1903                                 }
1904                                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1905                         }
1906                         } else {
1907                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1908                         }
1909                         goto leave;
1910                 }
1911
1912                 si->si_numops++;
1913                 if ( si->si_chkops || si->si_chktime ) {
1914                         /* Never checkpoint adding the context entry,
1915                          * it will deadlock
1916                          */
1917                         if ( op->o_tag != LDAP_REQ_ADD ||
1918                                 !dn_match( &op->o_req_ndn, &si->si_contextdn )) {
1919                                 if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1920                                         do_check = 1;
1921                                         si->si_numops = 0;
1922                                 }
1923                                 if ( si->si_chktime &&
1924                                         (op->o_time - si->si_chklast >= si->si_chktime )) {
1925                                         if ( si->si_chklast ) {
1926                                                 do_check = 1;
1927                                                 si->si_chklast = op->o_time;
1928                                         } else {
1929                                                 si->si_chklast = 1;
1930                                         }
1931                                 }
1932                         }
1933                 }
1934                 si->si_dirty = !csn_changed;
1935                 ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1936
1937                 if ( do_check ) {
1938                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1939                         syncprov_checkpoint( op, on );
1940                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1941                 }
1942
1943                 /* only update consumer ctx if this is a newer csn */
1944                 if ( csn_changed ) {
1945                         opc->sctxcsn = maxcsn;
1946                 }
1947
1948                 /* Handle any persistent searches */
1949                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1950                 have_psearches = ( si->si_ops != NULL );
1951                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1952                 if ( have_psearches ) {
1953                         switch(op->o_tag) {
1954                         case LDAP_REQ_ADD:
1955                         case LDAP_REQ_MODIFY:
1956                         case LDAP_REQ_MODRDN:
1957                         case LDAP_REQ_EXTENDED:
1958                                 syncprov_matchops( op, opc, 0 );
1959                                 break;
1960                         case LDAP_REQ_DELETE:
1961                                 /* for each match in opc->smatches:
1962                                  *   send DELETE msg
1963                                  */
1964                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1965                                         if ( sm->sm_op->s_op->o_abandon )
1966                                                 continue;
1967                                         syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_DELETE );
1968                                 }
1969                                 break;
1970                         }
1971                 }
1972
1973                 /* Add any log records */
1974                 if ( si->si_logs ) {
1975                         syncprov_add_slog( op );
1976                 }
1977 leave:          ldap_pvt_thread_mutex_unlock( &si->si_resp_mutex );
1978         }
1979         return SLAP_CB_CONTINUE;
1980 }
1981
1982 /* We don't use a subentry to store the context CSN any more.
1983  * We expose the current context CSN as an operational attribute
1984  * of the suffix entry.
1985  */
1986 static int
1987 syncprov_op_compare( Operation *op, SlapReply *rs )
1988 {
1989         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1990         syncprov_info_t         *si = on->on_bi.bi_private;
1991         int rc = SLAP_CB_CONTINUE;
1992
1993         if ( dn_match( &op->o_req_ndn, &si->si_contextdn ) &&
1994                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1995         {
1996                 Entry e = {0};
1997                 Attribute a = {0};
1998
1999                 e.e_name = si->si_contextdn;
2000                 e.e_nname = si->si_contextdn;
2001                 e.e_attrs = &a;
2002
2003                 a.a_desc = slap_schema.si_ad_contextCSN;
2004
2005                 ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2006
2007                 a.a_vals = si->si_ctxcsn;
2008                 a.a_nvals = a.a_vals;
2009                 a.a_numvals = si->si_numcsns;
2010
2011                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
2012                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
2013                 if ( ! rs->sr_err ) {
2014                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
2015                         goto return_results;
2016                 }
2017
2018                 if ( get_assert( op ) &&
2019                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
2020                 {
2021                         rs->sr_err = LDAP_ASSERTION_FAILED;
2022                         goto return_results;
2023                 }
2024
2025
2026                 rs->sr_err = LDAP_COMPARE_FALSE;
2027
2028                 if ( attr_valfind( &a,
2029                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
2030                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
2031                                 &op->oq_compare.rs_ava->aa_value, NULL, op->o_tmpmemctx ) == 0 )
2032                 {
2033                         rs->sr_err = LDAP_COMPARE_TRUE;
2034                 }
2035
2036 return_results:;
2037
2038                 ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2039
2040                 send_ldap_result( op, rs );
2041
2042                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
2043                         rs->sr_err = LDAP_SUCCESS;
2044                 }
2045                 rc = rs->sr_err;
2046         }
2047
2048         return rc;
2049 }
2050
2051 static int
2052 syncprov_op_mod( Operation *op, SlapReply *rs )
2053 {
2054         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2055         syncprov_info_t         *si = on->on_bi.bi_private;
2056         slap_callback *cb;
2057         opcookie *opc;
2058         int have_psearches, cbsize;
2059
2060         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2061         have_psearches = ( si->si_ops != NULL );
2062         si->si_active++;
2063         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2064
2065         cbsize = sizeof(slap_callback) + sizeof(opcookie) +
2066                 (have_psearches ? sizeof(modinst) : 0 );
2067
2068         cb = op->o_tmpcalloc(1, cbsize, op->o_tmpmemctx);
2069         opc = (opcookie *)(cb+1);
2070         opc->son = on;
2071         cb->sc_response = syncprov_op_response;
2072         cb->sc_cleanup = syncprov_op_cleanup;
2073         cb->sc_private = opc;
2074         cb->sc_next = op->o_callback;
2075         op->o_callback = cb;
2076
2077         opc->osid = -1;
2078         opc->rsid = -1;
2079         if ( op->o_csn.bv_val ) {
2080                 opc->osid = slap_parse_csn_sid( &op->o_csn );
2081         }
2082         if ( op->o_controls ) {
2083                 struct sync_cookie *scook =
2084                 op->o_controls[slap_cids.sc_LDAPsync];
2085                 if ( scook )
2086                         opc->rsid = scook->sid;
2087         }
2088
2089         if ( op->o_dont_replicate )
2090                 return SLAP_CB_CONTINUE;
2091
2092         /* If there are active persistent searches, lock this operation.
2093          * See seqmod.c for the locking logic on its own.
2094          */
2095         if ( have_psearches ) {
2096                 modtarget *mt, mtdummy;
2097                 modinst *mi;
2098
2099                 mi = (modinst *)(opc+1);
2100                 mi->mi_op = op;
2101
2102                 /* See if we're already modifying this entry... */
2103                 mtdummy.mt_dn = op->o_req_ndn;
2104                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
2105                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
2106                 if ( mt ) {
2107                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
2108                         if ( mt->mt_mods == NULL ) {
2109                                 /* Cannot reuse this mt, as another thread is about
2110                                  * to release it in syncprov_op_cleanup.
2111                                  */
2112                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2113                                 mt = NULL;
2114                         }
2115                 }
2116                 if ( mt ) {
2117                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
2118                         mt->mt_tail->mi_next = mi;
2119                         mt->mt_tail = mi;
2120                         /* wait for this op to get to head of list */
2121                         while ( mt->mt_mods != mi ) {
2122                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2123                                 /* FIXME: if dynamic config can delete overlays or
2124                                  * databases we'll have to check for cleanup here.
2125                                  * Currently it's not an issue because there are
2126                                  * no dynamic config deletes...
2127                                  */
2128                                 if ( slapd_shutdown )
2129                                         return SLAPD_ABANDON;
2130
2131                                 if ( !ldap_pvt_thread_pool_pausecheck( &connection_pool ))
2132                                         ldap_pvt_thread_yield();
2133                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
2134
2135                                 /* clean up if the caller is giving up */
2136                                 if ( op->o_abandon ) {
2137                                         modinst *m2;
2138                                         for ( m2 = mt->mt_mods; m2 && m2->mi_next != mi;
2139                                                 m2 = m2->mi_next );
2140                                         if ( m2 ) {
2141                                                 m2->mi_next = mi->mi_next;
2142                                                 if ( mt->mt_tail == mi ) mt->mt_tail = m2;
2143                                         }
2144                                         op->o_tmpfree( cb, op->o_tmpmemctx );
2145                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2146                                         return SLAPD_ABANDON;
2147                                 }
2148                         }
2149                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2150                 } else {
2151                         /* Record that we're modifying this entry now */
2152                         mt = ch_malloc( sizeof(modtarget) );
2153                         mt->mt_mods = mi;
2154                         mt->mt_tail = mi;
2155                         ber_dupbv( &mt->mt_dn, &mi->mi_op->o_req_ndn );
2156                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
2157                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
2158                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
2159                 }
2160                 opc->smt = mt;
2161         }
2162
2163         if (( have_psearches || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
2164                 syncprov_matchops( op, opc, 1 );
2165
2166         return SLAP_CB_CONTINUE;
2167 }
2168
2169 static int
2170 syncprov_op_extended( Operation *op, SlapReply *rs )
2171 {
2172         if ( exop_is_write( op ))
2173                 return syncprov_op_mod( op, rs );
2174
2175         return SLAP_CB_CONTINUE;
2176 }
2177
2178 typedef struct searchstate {
2179         slap_overinst *ss_on;
2180         syncops *ss_so;
2181         BerVarray ss_ctxcsn;
2182         int *ss_sids;
2183         int ss_numcsns;
2184 #define SS_PRESENT      0x01
2185 #define SS_CHANGED      0x02
2186         int ss_flags;
2187 } searchstate;
2188
2189 typedef struct SyncOperationBuffer {
2190         Operation               sob_op;
2191         Opheader                sob_hdr;
2192         OpExtra                 sob_oe;
2193         AttributeName   sob_extra;      /* not always present */
2194         /* Further data allocated here */
2195 } SyncOperationBuffer;
2196
2197 static void
2198 syncprov_detach_op( Operation *op, syncops *so, slap_overinst *on )
2199 {
2200         SyncOperationBuffer *sopbuf2;
2201         Operation *op2;
2202         int i, alen = 0;
2203         size_t size;
2204         char *ptr;
2205         GroupAssertion *g1, *g2;
2206
2207         /* count the search attrs */
2208         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2209                 alen += op->ors_attrs[i].an_name.bv_len + 1;
2210         }
2211         /* Make a new copy of the operation */
2212         size = offsetof( SyncOperationBuffer, sob_extra ) +
2213                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
2214                 op->o_req_dn.bv_len + 1 +
2215                 op->o_req_ndn.bv_len + 1 +
2216                 op->o_ndn.bv_len + 1 +
2217                 so->s_filterstr.bv_len + 1;
2218         sopbuf2 = ch_calloc( 1, size );
2219         op2 = &sopbuf2->sob_op;
2220         op2->o_hdr = &sopbuf2->sob_hdr;
2221         LDAP_SLIST_FIRST(&op2->o_extra) = &sopbuf2->sob_oe;
2222
2223         /* Copy the fields we care about explicitly, leave the rest alone */
2224         *op2->o_hdr = *op->o_hdr;
2225         op2->o_tag = op->o_tag;
2226         op2->o_time = op->o_time;
2227         op2->o_bd = on->on_info->oi_origdb;
2228         op2->o_request = op->o_request;
2229         op2->o_managedsait = op->o_managedsait;
2230         LDAP_SLIST_FIRST(&op2->o_extra)->oe_key = on;
2231         LDAP_SLIST_NEXT(LDAP_SLIST_FIRST(&op2->o_extra), oe_next) = NULL;
2232
2233         ptr = (char *) sopbuf2 + offsetof( SyncOperationBuffer, sob_extra );
2234         if ( i ) {
2235                 op2->ors_attrs = (AttributeName *) ptr;
2236                 ptr = (char *) &op2->ors_attrs[i+1];
2237                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2238                         op2->ors_attrs[i] = op->ors_attrs[i];
2239                         op2->ors_attrs[i].an_name.bv_val = ptr;
2240                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
2241                 }
2242                 BER_BVZERO( &op2->ors_attrs[i].an_name );
2243         }
2244
2245         op2->o_authz = op->o_authz;
2246         op2->o_ndn.bv_val = ptr;
2247         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
2248         op2->o_dn = op2->o_ndn;
2249         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
2250         op2->o_req_dn.bv_val = ptr;
2251         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
2252         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
2253         op2->o_req_ndn.bv_val = ptr;
2254         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
2255         op2->ors_filterstr.bv_val = ptr;
2256         strcpy( ptr, so->s_filterstr.bv_val );
2257         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
2258
2259         /* Skip the AND/GE clause that we stuck on in front */
2260         if ( so->s_flags & PS_FIX_FILTER ) {
2261                 op2->ors_filter = op->ors_filter->f_and->f_next;
2262                 so->s_flags ^= PS_FIX_FILTER;
2263         } else {
2264                 op2->ors_filter = op->ors_filter;
2265         }
2266         op2->ors_filter = filter_dup( op2->ors_filter, NULL );
2267         so->s_op = op2;
2268
2269         /* Copy any cached group ACLs individually */
2270         op2->o_groups = NULL;
2271         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
2272                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
2273                 *g2 = *g1;
2274                 strcpy( g2->ga_ndn, g1->ga_ndn );
2275                 g2->ga_next = op2->o_groups;
2276                 op2->o_groups = g2;
2277         }
2278         /* Don't allow any further group caching */
2279         op2->o_do_not_cache = 1;
2280
2281         /* Add op2 to conn so abandon will find us */
2282         op->o_conn->c_n_ops_executing++;
2283         op->o_conn->c_n_ops_completed--;
2284         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
2285         so->s_flags |= PS_IS_DETACHED;
2286
2287         /* Prevent anyone else from trying to send a result for this op */
2288         op->o_abandon = 1;
2289 }
2290
2291 static int
2292 syncprov_search_response( Operation *op, SlapReply *rs )
2293 {
2294         searchstate *ss = op->o_callback->sc_private;
2295         slap_overinst *on = ss->ss_on;
2296         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2297         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
2298
2299         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
2300                 Attribute *a;
2301                 /* If we got a referral without a referral object, there's
2302                  * something missing that we cannot replicate. Just ignore it.
2303                  * The consumer will abort because we didn't send the expected
2304                  * control.
2305                  */
2306                 if ( !rs->sr_entry ) {
2307                         assert( rs->sr_entry != NULL );
2308                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
2309                         return SLAP_CB_CONTINUE;
2310                 }
2311                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryCSN );
2312                 if ( a == NULL && rs->sr_operational_attrs != NULL ) {
2313                         a = attr_find( rs->sr_operational_attrs, slap_schema.si_ad_entryCSN );
2314                 }
2315                 if ( a ) {
2316                         int i, sid;
2317                         sid = slap_parse_csn_sid( &a->a_nvals[0] );
2318
2319                         /* Don't send changed entries back to the originator */
2320                         if ( sid == srs->sr_state.sid && srs->sr_state.numcsns ) {
2321                                 Debug( LDAP_DEBUG_SYNC,
2322                                         "Entry %s changed by peer, ignored\n",
2323                                         rs->sr_entry->e_name.bv_val, 0, 0 );
2324                                 return LDAP_SUCCESS;
2325                         }
2326
2327                         /* If not a persistent search */
2328                         if ( !ss->ss_so ) {
2329                                 /* Make sure entry is less than the snapshot'd contextCSN */
2330                                 for ( i=0; i<ss->ss_numcsns; i++ ) {
2331                                         if ( sid == ss->ss_sids[i] && ber_bvcmp( &a->a_nvals[0],
2332                                                 &ss->ss_ctxcsn[i] ) > 0 ) {
2333                                                 Debug( LDAP_DEBUG_SYNC,
2334                                                         "Entry %s CSN %s greater than snapshot %s\n",
2335                                                         rs->sr_entry->e_name.bv_val,
2336                                                         a->a_nvals[0].bv_val,
2337                                                         ss->ss_ctxcsn[i].bv_val );
2338                                                 return LDAP_SUCCESS;
2339                                         }
2340                                 }
2341                         }
2342
2343                         /* Don't send old entries twice */
2344                         if ( srs->sr_state.ctxcsn ) {
2345                                 for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2346                                         if ( sid == srs->sr_state.sids[i] &&
2347                                                 ber_bvcmp( &a->a_nvals[0],
2348                                                         &srs->sr_state.ctxcsn[i] )<= 0 ) {
2349                                                 Debug( LDAP_DEBUG_SYNC,
2350                                                         "Entry %s CSN %s older or equal to ctx %s\n",
2351                                                         rs->sr_entry->e_name.bv_val,
2352                                                         a->a_nvals[0].bv_val,
2353                                                         srs->sr_state.ctxcsn[i].bv_val );
2354                                                 return LDAP_SUCCESS;
2355                                         }
2356                                 }
2357                         }
2358                 }
2359                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2360                         op->o_tmpmemctx );
2361                 rs->sr_ctrls[1] = NULL;
2362                 rs->sr_flags |= REP_CTRLS_MUSTBEFREED;
2363                 /* If we're in delta-sync mode, always send a cookie */
2364                 if ( si->si_nopres && si->si_usehint && a ) {
2365                         struct berval cookie;
2366                         slap_compose_sync_cookie( op, &cookie, a->a_nvals, srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2367                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2368                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 1, &cookie );
2369                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2370                 } else {
2371                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2372                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
2373                 }
2374         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
2375                 struct berval cookie = BER_BVNULL;
2376
2377                 if ( ( ss->ss_flags & SS_CHANGED ) &&
2378                         ss->ss_ctxcsn && !BER_BVISNULL( &ss->ss_ctxcsn[0] )) {
2379                         slap_compose_sync_cookie( op, &cookie, ss->ss_ctxcsn,
2380                                 srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2381
2382                         Debug( LDAP_DEBUG_SYNC, "syncprov_search_response: cookie=%s\n", cookie.bv_val, 0, 0 );
2383                 }
2384
2385                 /* Is this a regular refresh?
2386                  * Note: refresh never gets here if there were no changes
2387                  */
2388                 if ( !ss->ss_so ) {
2389                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2390                                 op->o_tmpmemctx );
2391                         rs->sr_ctrls[1] = NULL;
2392                         rs->sr_flags |= REP_CTRLS_MUSTBEFREED;
2393                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
2394                                 0, 1, &cookie, ( ss->ss_flags & SS_PRESENT ) ?  LDAP_SYNC_REFRESH_PRESENTS :
2395                                         LDAP_SYNC_REFRESH_DELETES );
2396                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2397                 } else {
2398                 /* It's RefreshAndPersist, transition to Persist phase */
2399                         syncprov_sendinfo( op, rs, ( ss->ss_flags & SS_PRESENT ) ?
2400                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
2401                                 ( ss->ss_flags & SS_CHANGED ) ? &cookie : NULL,
2402                                 1, NULL, 0 );
2403                         if ( !BER_BVISNULL( &cookie ))
2404                                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2405
2406                         /* Detach this Op from frontend control */
2407                         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
2408
2409                         /* But not if this connection was closed along the way */
2410                         if ( op->o_abandon ) {
2411                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2412                                 /* syncprov_ab_cleanup will free this syncop */
2413                                 return SLAPD_ABANDON;
2414
2415                         } else {
2416                                 ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
2417                                 /* Turn off the refreshing flag */
2418                                 ss->ss_so->s_flags ^= PS_IS_REFRESHING;
2419
2420                                 syncprov_detach_op( op, ss->ss_so, on );
2421
2422                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2423
2424                                 /* If there are queued responses, fire them off */
2425                                 if ( ss->ss_so->s_res )
2426                                         syncprov_qstart( ss->ss_so );
2427                                 ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
2428                         }
2429
2430                         return LDAP_SUCCESS;
2431                 }
2432         }
2433
2434         return SLAP_CB_CONTINUE;
2435 }
2436
2437 static int
2438 syncprov_op_search( Operation *op, SlapReply *rs )
2439 {
2440         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2441         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2442         slap_callback   *cb;
2443         int gotstate = 0, changed = 0, do_present = 0;
2444         syncops *sop = NULL;
2445         searchstate *ss;
2446         sync_control *srs;
2447         BerVarray ctxcsn;
2448         int i, *sids, numcsns;
2449         struct berval mincsn, maxcsn;
2450         int minsid, maxsid;
2451         int dirty = 0;
2452
2453         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
2454
2455         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
2456                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
2457                 return rs->sr_err;
2458         }
2459
2460         srs = op->o_controls[slap_cids.sc_LDAPsync];
2461
2462         /* If this is a persistent search, set it up right away */
2463         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
2464                 syncops so = {0};
2465                 fbase_cookie fc;
2466                 opcookie opc;
2467                 slap_callback sc;
2468
2469                 fc.fss = &so;
2470                 fc.fbase = 0;
2471                 so.s_eid = NOID;
2472                 so.s_op = op;
2473                 so.s_flags = PS_IS_REFRESHING | PS_FIND_BASE;
2474                 /* syncprov_findbase expects to be called as a callback... */
2475                 sc.sc_private = &opc;
2476                 opc.son = on;
2477                 ldap_pvt_thread_mutex_init( &so.s_mutex );
2478                 cb = op->o_callback;
2479                 op->o_callback = &sc;
2480                 rs->sr_err = syncprov_findbase( op, &fc );
2481                 op->o_callback = cb;
2482                 ldap_pvt_thread_mutex_destroy( &so.s_mutex );
2483
2484                 if ( rs->sr_err != LDAP_SUCCESS ) {
2485                         send_ldap_result( op, rs );
2486                         return rs->sr_err;
2487                 }
2488                 sop = ch_malloc( sizeof( syncops ));
2489                 *sop = so;
2490                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
2491                 sop->s_rid = srs->sr_state.rid;
2492                 sop->s_sid = srs->sr_state.sid;
2493                 /* set refcount=2 to prevent being freed out from under us
2494                  * by abandons that occur while we're running here
2495                  */
2496                 sop->s_inuse = 2;
2497
2498                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2499                 while ( si->si_active ) {
2500                         /* Wait for active mods to finish before proceeding, as they
2501                          * may already have inspected the si_ops list looking for
2502                          * consumers to replicate the change to.  Using the log
2503                          * doesn't help, as we may finish playing it before the
2504                          * active mods gets added to it.
2505                          */
2506                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2507                         if ( slapd_shutdown ) {
2508                                 ch_free( sop );
2509                                 return SLAPD_ABANDON;
2510                         }
2511                         if ( !ldap_pvt_thread_pool_pausecheck( &connection_pool ))
2512                                 ldap_pvt_thread_yield();
2513                         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2514                 }
2515                 sop->s_next = si->si_ops;
2516                 sop->s_si = si;
2517                 si->si_ops = sop;
2518                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2519         }
2520
2521         /* snapshot the ctxcsn */
2522         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2523         numcsns = si->si_numcsns;
2524         if ( numcsns ) {
2525                 ber_bvarray_dup_x( &ctxcsn, si->si_ctxcsn, op->o_tmpmemctx );
2526                 sids = op->o_tmpalloc( numcsns * sizeof(int), op->o_tmpmemctx );
2527                 for ( i=0; i<numcsns; i++ )
2528                         sids[i] = si->si_sids[i];
2529         } else {
2530                 ctxcsn = NULL;
2531                 sids = NULL;
2532         }
2533         dirty = si->si_dirty;
2534         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2535
2536         /* If we have a cookie, handle the PRESENT lookups */
2537         if ( srs->sr_state.ctxcsn ) {
2538                 sessionlog *sl;
2539                 int i, j;
2540
2541                 /* If we don't have any CSN of our own yet, pretend nothing
2542                  * has changed.
2543                  */
2544                 if ( !numcsns )
2545                         goto no_change;
2546
2547                 if ( !si->si_nopres )
2548                         do_present = SS_PRESENT;
2549
2550                 /* If there are SIDs we don't recognize in the cookie, drop them */
2551                 for (i=0; i<srs->sr_state.numcsns; ) {
2552                         for (j=i; j<numcsns; j++) {
2553                                 if ( srs->sr_state.sids[i] <= sids[j] ) {
2554                                         break;
2555                                 }
2556                         }
2557                         /* not found */
2558                         if ( j == numcsns || srs->sr_state.sids[i] != sids[j] ) {
2559                                 char *tmp = srs->sr_state.ctxcsn[i].bv_val;
2560                                 srs->sr_state.numcsns--;
2561                                 for ( j=i; j<srs->sr_state.numcsns; j++ ) {
2562                                         srs->sr_state.ctxcsn[j] = srs->sr_state.ctxcsn[j+1];
2563                                         srs->sr_state.sids[j] = srs->sr_state.sids[j+1];
2564                                 }
2565                                 srs->sr_state.ctxcsn[j].bv_val = tmp;
2566                                 srs->sr_state.ctxcsn[j].bv_len = 0;
2567                                 continue;
2568                         }
2569                         i++;
2570                 }
2571
2572                 if (srs->sr_state.numcsns != numcsns) {
2573                         /* consumer doesn't have the right number of CSNs */
2574                         changed = SS_CHANGED;
2575                         if ( srs->sr_state.ctxcsn ) {
2576                                 ber_bvarray_free_x( srs->sr_state.ctxcsn, op->o_tmpmemctx );
2577                                 srs->sr_state.ctxcsn = NULL;
2578                         }
2579                         if ( srs->sr_state.sids ) {
2580                                 slap_sl_free( srs->sr_state.sids, op->o_tmpmemctx );
2581                                 srs->sr_state.sids = NULL;
2582                         }
2583                         srs->sr_state.numcsns = 0;
2584                         goto shortcut;
2585                 }
2586
2587                 /* Find the smallest CSN which differs from contextCSN */
2588                 mincsn.bv_len = 0;
2589                 maxcsn.bv_len = 0;
2590                 for ( i=0,j=0; i<srs->sr_state.numcsns; i++ ) {
2591                         int newer;
2592                         while ( srs->sr_state.sids[i] != sids[j] ) j++;
2593                         if ( BER_BVISEMPTY( &maxcsn ) || ber_bvcmp( &maxcsn,
2594                                 &srs->sr_state.ctxcsn[i] ) < 0 ) {
2595                                 maxcsn = srs->sr_state.ctxcsn[i];
2596                                 maxsid = sids[j];
2597                         }
2598                         newer = ber_bvcmp( &srs->sr_state.ctxcsn[i], &ctxcsn[j] );
2599                         /* If our state is newer, tell consumer about changes */
2600                         if ( newer < 0) {
2601                                 changed = SS_CHANGED;
2602                                 if ( BER_BVISEMPTY( &mincsn ) || ber_bvcmp( &mincsn,
2603                                         &srs->sr_state.ctxcsn[i] ) > 0 ) {
2604                                         mincsn = srs->sr_state.ctxcsn[i];
2605                                         minsid = sids[j];
2606                                 }
2607                         } else if ( newer > 0 && sids[j] == slap_serverID ) {
2608                         /* our state is older, complain to consumer */
2609                                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
2610                                 rs->sr_text = "consumer state is newer than provider!";
2611 bailout:
2612                                 if ( sop ) {
2613                                         syncops **sp = &si->si_ops;
2614
2615                                         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2616                                         while ( *sp != sop )
2617                                                 sp = &(*sp)->s_next;
2618                                         *sp = sop->s_next;
2619                                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2620                                         ch_free( sop );
2621                                 }
2622                                 rs->sr_ctrls = NULL;
2623                                 send_ldap_result( op, rs );
2624                                 return rs->sr_err;
2625                         }
2626                 }
2627                 if ( BER_BVISEMPTY( &mincsn )) {
2628                         mincsn = maxcsn;
2629                         minsid = maxsid;
2630                 }
2631
2632                 /* If nothing has changed, shortcut it */
2633                 if ( !changed && !dirty ) {
2634                         do_present = 0;
2635 no_change:              if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
2636                                 LDAPControl     *ctrls[2];
2637
2638                                 ctrls[0] = NULL;
2639                                 ctrls[1] = NULL;
2640                                 syncprov_done_ctrl( op, rs, ctrls, 0, 0,
2641                                         NULL, LDAP_SYNC_REFRESH_DELETES );
2642                                 rs->sr_ctrls = ctrls;
2643                                 rs->sr_err = LDAP_SUCCESS;
2644                                 send_ldap_result( op, rs );
2645                                 rs->sr_ctrls = NULL;
2646                                 return rs->sr_err;
2647                         }
2648                         goto shortcut;
2649                 }
2650
2651                 /* Do we have a sessionlog for this search? */
2652                 sl=si->si_logs;
2653                 if ( sl ) {
2654                         int do_play = 0;
2655                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
2656                         /* Are there any log entries, and is the consumer state
2657                          * present in the session log?
2658                          */
2659                         if ( sl->sl_num > 0 ) {
2660                                 int i;
2661                                 for ( i=0; i<sl->sl_numcsns; i++ ) {
2662                                         /* SID not present == new enough */
2663                                         if ( minsid < sl->sl_sids[i] ) {
2664                                                 do_play = 1;
2665                                                 break;
2666                                         }
2667                                         /* SID present */
2668                                         if ( minsid == sl->sl_sids[i] ) {
2669                                                 /* new enough? */
2670                                                 if ( ber_bvcmp( &mincsn, &sl->sl_mincsn[i] ) >= 0 )
2671                                                         do_play = 1;
2672                                                 break;
2673                                         }
2674                                 }
2675                                 /* SID not present == new enough */
2676                                 if ( i == sl->sl_numcsns )
2677                                         do_play = 1;
2678                         }
2679                         if ( do_play ) {
2680                                 do_present = 0;
2681                                 /* mutex is unlocked in playlog */
2682                                 syncprov_playlog( op, rs, sl, srs, ctxcsn, numcsns, sids );
2683                         } else {
2684                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
2685                         }
2686                 }
2687                 /* Is the CSN still present in the database? */
2688                 if ( syncprov_findcsn( op, FIND_CSN, &mincsn ) != LDAP_SUCCESS ) {
2689                         /* No, so a reload is required */
2690                         /* the 2.2 consumer doesn't send this hint */
2691                         if ( si->si_usehint && srs->sr_rhint == 0 ) {
2692                                 if ( ctxcsn )
2693                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2694                                 if ( sids )
2695                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2696                                 rs->sr_err = LDAP_SYNC_REFRESH_REQUIRED;
2697                                 rs->sr_text = "sync cookie is stale";
2698                                 goto bailout;
2699                         }
2700                         if ( srs->sr_state.ctxcsn ) {
2701                                 ber_bvarray_free_x( srs->sr_state.ctxcsn, op->o_tmpmemctx );
2702                                 srs->sr_state.ctxcsn = NULL;
2703                         }
2704                         if ( srs->sr_state.sids ) {
2705                                 slap_sl_free( srs->sr_state.sids, op->o_tmpmemctx );
2706                                 srs->sr_state.sids = NULL;
2707                         }
2708                         srs->sr_state.numcsns = 0;
2709                 } else {
2710                         gotstate = 1;
2711                         /* If changed and doing Present lookup, send Present UUIDs */
2712                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT, 0 ) !=
2713                                 LDAP_SUCCESS ) {
2714                                 if ( ctxcsn )
2715                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2716                                 if ( sids )
2717                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2718                                 goto bailout;
2719                         }
2720                 }
2721         } else {
2722                 /* No consumer state, assume something has changed */
2723                 changed = SS_CHANGED;
2724         }
2725
2726 shortcut:
2727         /* Append CSN range to search filter, save original filter
2728          * for persistent search evaluation
2729          */
2730         if ( sop ) {
2731                 ldap_pvt_thread_mutex_lock( &sop->s_mutex );
2732                 sop->s_filterstr = op->ors_filterstr;
2733                 /* correct the refcount that was set to 2 before */
2734                 sop->s_inuse--;
2735         }
2736
2737         /* If something changed, find the changes */
2738         if ( gotstate && ( changed || dirty ) ) {
2739                 Filter *fand, *fava;
2740
2741                 fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2742                 fand->f_choice = LDAP_FILTER_AND;
2743                 fand->f_next = NULL;
2744                 fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2745                 fand->f_and = fava;
2746                 fava->f_choice = LDAP_FILTER_GE;
2747                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
2748                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
2749 #ifdef LDAP_COMP_MATCH
2750                 fava->f_ava->aa_cf = NULL;
2751 #endif
2752                 ber_dupbv_x( &fava->f_ava->aa_value, &mincsn, op->o_tmpmemctx );
2753                 fava->f_next = op->ors_filter;
2754                 op->ors_filter = fand;
2755                 filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
2756                 if ( sop ) {
2757                         sop->s_flags |= PS_FIX_FILTER;
2758                 }
2759         }
2760         if ( sop ) {
2761                 ldap_pvt_thread_mutex_unlock( &sop->s_mutex );
2762         }
2763
2764         /* Let our callback add needed info to returned entries */
2765         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
2766         ss = (searchstate *)(cb+1);
2767         ss->ss_on = on;
2768         ss->ss_so = sop;
2769         ss->ss_flags = do_present | changed;
2770         ss->ss_ctxcsn = ctxcsn;
2771         ss->ss_numcsns = numcsns;
2772         ss->ss_sids = sids;
2773         cb->sc_response = syncprov_search_response;
2774         cb->sc_private = ss;
2775         cb->sc_next = op->o_callback;
2776         op->o_callback = cb;
2777
2778         /* If this is a persistent search and no changes were reported during
2779          * the refresh phase, just invoke the response callback to transition
2780          * us into persist phase
2781          */
2782         if ( !changed && !dirty ) {
2783                 rs->sr_err = LDAP_SUCCESS;
2784                 rs->sr_nentries = 0;
2785                 send_ldap_result( op, rs );
2786                 return rs->sr_err;
2787         }
2788         return SLAP_CB_CONTINUE;
2789 }
2790
2791 static int
2792 syncprov_operational(
2793         Operation *op,
2794         SlapReply *rs )
2795 {
2796         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2797         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2798
2799         /* This prevents generating unnecessarily; frontend will strip
2800          * any statically stored copy.
2801          */
2802         if ( op->o_sync != SLAP_CONTROL_NONE )
2803                 return SLAP_CB_CONTINUE;
2804
2805         if ( rs->sr_entry &&
2806                 dn_match( &rs->sr_entry->e_nname, &si->si_contextdn )) {
2807
2808                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
2809                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
2810                         Attribute *a, **ap = NULL;
2811
2812                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
2813                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
2814                                         break;
2815                         }
2816
2817                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2818                         if ( si->si_ctxcsn ) {
2819                                 if ( !a ) {
2820                                         for ( ap = &rs->sr_operational_attrs; *ap;
2821                                                 ap=&(*ap)->a_next );
2822
2823                                         a = attr_alloc( slap_schema.si_ad_contextCSN );
2824                                         *ap = a;
2825                                 }
2826
2827                                 if ( !ap ) {
2828                                         if ( rs_entry2modifiable( op, rs, on )) {
2829                                                 a = attr_find( rs->sr_entry->e_attrs,
2830                                                         slap_schema.si_ad_contextCSN );
2831                                         }
2832                                         if ( a->a_nvals != a->a_vals ) {
2833                                                 ber_bvarray_free( a->a_nvals );
2834                                         }
2835                                         a->a_nvals = NULL;
2836                                         ber_bvarray_free( a->a_vals );
2837                                         a->a_vals = NULL;
2838                                         a->a_numvals = 0;
2839                                 }
2840                                 attr_valadd( a, si->si_ctxcsn, si->si_ctxcsn, si->si_numcsns );
2841                         }
2842                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2843                 }
2844         }
2845         return SLAP_CB_CONTINUE;
2846 }
2847
2848 enum {
2849         SP_CHKPT = 1,
2850         SP_SESSL,
2851         SP_NOPRES,
2852         SP_USEHINT
2853 };
2854
2855 static ConfigDriver sp_cf_gen;
2856
2857 static ConfigTable spcfg[] = {
2858         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2859                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2860                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2861                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2862         { "syncprov-sessionlog", "ops", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2863                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2864                         "DESC 'Session log size in ops' "
2865                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2866         { "syncprov-nopresent", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_NOPRES,
2867                 sp_cf_gen, "( OLcfgOvAt:1.3 NAME 'olcSpNoPresent' "
2868                         "DESC 'Omit Present phase processing' "
2869                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2870         { "syncprov-reloadhint", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_USEHINT,
2871                 sp_cf_gen, "( OLcfgOvAt:1.4 NAME 'olcSpReloadHint' "
2872                         "DESC 'Observe Reload Hint in Request control' "
2873                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2874         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2875 };
2876
2877 static ConfigOCs spocs[] = {
2878         { "( OLcfgOvOc:1.1 "
2879                 "NAME 'olcSyncProvConfig' "
2880                 "DESC 'SyncRepl Provider configuration' "
2881                 "SUP olcOverlayConfig "
2882                 "MAY ( olcSpCheckpoint "
2883                         "$ olcSpSessionlog "
2884                         "$ olcSpNoPresent "
2885                         "$ olcSpReloadHint "
2886                 ") )",
2887                         Cft_Overlay, spcfg },
2888         { NULL, 0, NULL }
2889 };
2890
2891 static int
2892 sp_cf_gen(ConfigArgs *c)
2893 {
2894         slap_overinst           *on = (slap_overinst *)c->bi;
2895         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2896         int rc = 0;
2897
2898         if ( c->op == SLAP_CONFIG_EMIT ) {
2899                 switch ( c->type ) {
2900                 case SP_CHKPT:
2901                         if ( si->si_chkops || si->si_chktime ) {
2902                                 struct berval bv;
2903                                 /* we assume si_chktime is a multiple of 60
2904                                  * because the parsed value was originally
2905                                  * multiplied by 60 */
2906                                 bv.bv_len = snprintf( c->cr_msg, sizeof( c->cr_msg ),
2907                                         "%d %d", si->si_chkops, si->si_chktime/60 );
2908                                 if ( bv.bv_len >= sizeof( c->cr_msg ) ) {
2909                                         rc = 1;
2910                                 } else {
2911                                         bv.bv_val = c->cr_msg;
2912                                         value_add_one( &c->rvalue_vals, &bv );
2913                                 }
2914                         } else {
2915                                 rc = 1;
2916                         }
2917                         break;
2918                 case SP_SESSL:
2919                         if ( si->si_logs ) {
2920                                 c->value_int = si->si_logs->sl_size;
2921                         } else {
2922                                 rc = 1;
2923                         }
2924                         break;
2925                 case SP_NOPRES:
2926                         if ( si->si_nopres ) {
2927                                 c->value_int = 1;
2928                         } else {
2929                                 rc = 1;
2930                         }
2931                         break;
2932                 case SP_USEHINT:
2933                         if ( si->si_usehint ) {
2934                                 c->value_int = 1;
2935                         } else {
2936                                 rc = 1;
2937                         }
2938                         break;
2939                 }
2940                 return rc;
2941         } else if ( c->op == LDAP_MOD_DELETE ) {
2942                 switch ( c->type ) {
2943                 case SP_CHKPT:
2944                         si->si_chkops = 0;
2945                         si->si_chktime = 0;
2946                         break;
2947                 case SP_SESSL:
2948                         if ( si->si_logs )
2949                                 si->si_logs->sl_size = 0;
2950                         else
2951                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2952                         break;
2953                 case SP_NOPRES:
2954                         if ( si->si_nopres )
2955                                 si->si_nopres = 0;
2956                         else
2957                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2958                         break;
2959                 case SP_USEHINT:
2960                         if ( si->si_usehint )
2961                                 si->si_usehint = 0;
2962                         else
2963                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2964                         break;
2965                 }
2966                 return rc;
2967         }
2968         switch ( c->type ) {
2969         case SP_CHKPT:
2970                 if ( lutil_atoi( &si->si_chkops, c->argv[1] ) != 0 ) {
2971                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint ops # \"%s\"",
2972                                 c->argv[0], c->argv[1] );
2973                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2974                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2975                         return ARG_BAD_CONF;
2976                 }
2977                 if ( si->si_chkops <= 0 ) {
2978                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint ops # \"%d\"",
2979                                 c->argv[0], si->si_chkops );
2980                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2981                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2982                         return ARG_BAD_CONF;
2983                 }
2984                 if ( lutil_atoi( &si->si_chktime, c->argv[2] ) != 0 ) {
2985                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint time \"%s\"",
2986                                 c->argv[0], c->argv[1] );
2987                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2988                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2989                         return ARG_BAD_CONF;
2990                 }
2991                 if ( si->si_chktime <= 0 ) {
2992                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint time \"%d\"",
2993                                 c->argv[0], si->si_chkops );
2994                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2995                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2996                         return ARG_BAD_CONF;
2997                 }
2998                 si->si_chktime *= 60;
2999                 break;
3000         case SP_SESSL: {
3001                 sessionlog *sl;
3002                 int size = c->value_int;
3003
3004                 if ( size < 0 ) {
3005                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s size %d is negative",
3006                                 c->argv[0], size );
3007                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
3008                                 "%s: %s\n", c->log, c->cr_msg, 0 );
3009                         return ARG_BAD_CONF;
3010                 }
3011                 sl = si->si_logs;
3012                 if ( !sl ) {
3013                         sl = ch_malloc( sizeof( sessionlog ));
3014                         sl->sl_mincsn = NULL;
3015                         sl->sl_sids = NULL;
3016                         sl->sl_num = 0;
3017                         sl->sl_numcsns = 0;
3018                         sl->sl_head = sl->sl_tail = NULL;
3019                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
3020                         si->si_logs = sl;
3021                 }
3022                 sl->sl_size = size;
3023                 }
3024                 break;
3025         case SP_NOPRES:
3026                 si->si_nopres = c->value_int;
3027                 break;
3028         case SP_USEHINT:
3029                 si->si_usehint = c->value_int;
3030                 break;
3031         }
3032         return rc;
3033 }
3034
3035 /* ITS#3456 we cannot run this search on the main thread, must use a
3036  * child thread in order to insure we have a big enough stack.
3037  */
3038 static void *
3039 syncprov_db_otask(
3040         void *ptr
3041 )
3042 {
3043         syncprov_findcsn( ptr, FIND_MAXCSN, 0 );
3044         return NULL;
3045 }
3046
3047
3048 /* Read any existing contextCSN from the underlying db.
3049  * Then search for any entries newer than that. If no value exists,
3050  * just generate it. Cache whatever result.
3051  */
3052 static int
3053 syncprov_db_open(
3054         BackendDB *be,
3055         ConfigReply *cr
3056 )
3057 {
3058         slap_overinst   *on = (slap_overinst *) be->bd_info;
3059         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3060
3061         Connection conn = { 0 };
3062         OperationBuffer opbuf;
3063         Operation *op;
3064         Entry *e = NULL;
3065         Attribute *a;
3066         int rc;
3067         void *thrctx = NULL;
3068
3069         if ( !SLAP_LASTMOD( be )) {
3070                 Debug( LDAP_DEBUG_ANY,
3071                         "syncprov_db_open: invalid config, lastmod must be enabled\n", 0, 0, 0 );
3072                 return -1;
3073         }
3074
3075         if ( slapMode & SLAP_TOOL_MODE ) {
3076                 return 0;
3077         }
3078
3079         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
3080         if ( rc ) {
3081                 return rc;
3082         }
3083
3084         thrctx = ldap_pvt_thread_pool_context();
3085         connection_fake_init2( &conn, &opbuf, thrctx, 0 );
3086         op = &opbuf.ob_op;
3087         op->o_bd = be;
3088         op->o_dn = be->be_rootdn;
3089         op->o_ndn = be->be_rootndn;
3090
3091         if ( SLAP_SYNC_SUBENTRY( be )) {
3092                 build_new_dn( &si->si_contextdn, be->be_nsuffix,
3093                         (struct berval *)&slap_ldapsync_cn_bv, NULL );
3094         } else {
3095                 si->si_contextdn = be->be_nsuffix[0];
3096         }
3097         rc = overlay_entry_get_ov( op, &si->si_contextdn, NULL,
3098                 slap_schema.si_ad_contextCSN, 0, &e, on );
3099
3100         if ( e ) {
3101                 ldap_pvt_thread_t tid;
3102
3103                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
3104                 if ( a ) {
3105                         ber_bvarray_dup_x( &si->si_ctxcsn, a->a_vals, NULL );
3106                         si->si_numcsns = a->a_numvals;
3107                         si->si_sids = slap_parse_csn_sids( si->si_ctxcsn, a->a_numvals, NULL );
3108                         slap_sort_csn_sids( si->si_ctxcsn, si->si_sids, si->si_numcsns, NULL );
3109                 }
3110                 overlay_entry_release_ov( op, e, 0, on );
3111                 if ( si->si_ctxcsn && !SLAP_DBCLEAN( be )) {
3112                         op->o_tag = LDAP_REQ_SEARCH;
3113                         op->o_req_dn = be->be_suffix[0];
3114                         op->o_req_ndn = be->be_nsuffix[0];
3115                         op->ors_scope = LDAP_SCOPE_SUBTREE;
3116                         ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
3117                         ldap_pvt_thread_join( tid, NULL );
3118                 }
3119         }
3120
3121         /* Didn't find a contextCSN, should we generate one? */
3122         if ( !si->si_ctxcsn ) {
3123                 char csnbuf[ LDAP_PVT_CSNSTR_BUFSIZE ];
3124                 struct berval csn;
3125
3126                 if ( SLAP_SYNC_SHADOW( op->o_bd )) {
3127                 /* If we're also a consumer, then don't generate anything.
3128                  * Wait for our provider to send it to us, or for a local
3129                  * modify if we have multimaster.
3130                  */
3131                         goto out;
3132                 }
3133                 csn.bv_val = csnbuf;
3134                 csn.bv_len = sizeof( csnbuf );
3135                 slap_get_csn( op, &csn, 0 );
3136                 value_add_one( &si->si_ctxcsn, &csn );
3137                 si->si_numcsns = 1;
3138                 si->si_sids = ch_malloc( sizeof(int) );
3139                 si->si_sids[0] = slap_serverID;
3140
3141                 /* make sure we do a checkpoint on close */
3142                 si->si_numops++;
3143         }
3144
3145         /* Initialize the sessionlog mincsn */
3146         if ( si->si_logs && si->si_numcsns ) {
3147                 sessionlog *sl = si->si_logs;
3148                 int i;
3149                 ber_bvarray_dup_x( &sl->sl_mincsn, si->si_ctxcsn, NULL );
3150                 sl->sl_numcsns = si->si_numcsns;
3151                 sl->sl_sids = ch_malloc( si->si_numcsns * sizeof(int) );
3152                 for ( i=0; i < si->si_numcsns; i++ )
3153                         sl->sl_sids[i] = si->si_sids[i];
3154         }
3155
3156 out:
3157         op->o_bd->bd_info = (BackendInfo *)on;
3158         return 0;
3159 }
3160
3161 /* Write the current contextCSN into the underlying db.
3162  */
3163 static int
3164 syncprov_db_close(
3165         BackendDB *be,
3166         ConfigReply *cr
3167 )
3168 {
3169     slap_overinst   *on = (slap_overinst *) be->bd_info;
3170     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3171 #ifdef SLAP_CONFIG_DELETE
3172         syncops *so, *sonext;
3173 #endif /* SLAP_CONFIG_DELETE */
3174
3175         if ( slapMode & SLAP_TOOL_MODE ) {
3176                 return 0;
3177         }
3178         if ( si->si_numops ) {
3179                 Connection conn = {0};
3180                 OperationBuffer opbuf;
3181                 Operation *op;
3182                 void *thrctx;
3183
3184                 thrctx = ldap_pvt_thread_pool_context();
3185                 connection_fake_init2( &conn, &opbuf, thrctx, 0 );
3186                 op = &opbuf.ob_op;
3187                 op->o_bd = be;
3188                 op->o_dn = be->be_rootdn;
3189                 op->o_ndn = be->be_rootndn;
3190                 syncprov_checkpoint( op, on );
3191         }
3192
3193 #ifdef SLAP_CONFIG_DELETE
3194         if ( !slapd_shutdown ) {
3195                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
3196                 for ( so=si->si_ops, sonext=so;  so; so=sonext  ) {
3197                         SlapReply rs = {REP_RESULT};
3198                         rs.sr_err = LDAP_UNAVAILABLE;
3199                         send_ldap_result( so->s_op, &rs );
3200                         sonext=so->s_next;
3201                         syncprov_drop_psearch( so, 0);
3202                 }
3203                 si->si_ops=NULL;
3204                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
3205         }
3206         overlay_unregister_control( be, LDAP_CONTROL_SYNC );
3207 #endif /* SLAP_CONFIG_DELETE */
3208
3209     return 0;
3210 }
3211
3212 static int
3213 syncprov_db_init(
3214         BackendDB *be,
3215         ConfigReply *cr
3216 )
3217 {
3218         slap_overinst   *on = (slap_overinst *)be->bd_info;
3219         syncprov_info_t *si;
3220
3221         if ( SLAP_ISGLOBALOVERLAY( be ) ) {
3222                 Debug( LDAP_DEBUG_ANY,
3223                         "syncprov must be instantiated within a database.\n",
3224                         0, 0, 0 );
3225                 return 1;
3226         }
3227
3228         si = ch_calloc(1, sizeof(syncprov_info_t));
3229         on->on_bi.bi_private = si;
3230         ldap_pvt_thread_rdwr_init( &si->si_csn_rwlock );
3231         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
3232         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
3233         ldap_pvt_thread_mutex_init( &si->si_resp_mutex );
3234
3235         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
3236         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
3237         csn_anlist[1].an_desc = slap_schema.si_ad_entryUUID;
3238         csn_anlist[1].an_name = slap_schema.si_ad_entryUUID->ad_cname;
3239
3240         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
3241         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
3242
3243         return 0;
3244 }
3245
3246 static int
3247 syncprov_db_destroy(
3248         BackendDB *be,
3249         ConfigReply *cr
3250 )
3251 {
3252         slap_overinst   *on = (slap_overinst *)be->bd_info;
3253         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3254
3255         if ( si ) {
3256                 if ( si->si_logs ) {
3257                         sessionlog *sl = si->si_logs;
3258                         slog_entry *se = sl->sl_head;
3259
3260                         while ( se ) {
3261                                 slog_entry *se_next = se->se_next;
3262                                 ch_free( se );
3263                                 se = se_next;
3264                         }
3265                         if ( sl->sl_mincsn )
3266                                 ber_bvarray_free( sl->sl_mincsn );
3267                         if ( sl->sl_sids )
3268                                 ch_free( sl->sl_sids );
3269
3270                         ldap_pvt_thread_mutex_destroy(&si->si_logs->sl_mutex);
3271                         ch_free( si->si_logs );
3272                 }
3273                 if ( si->si_ctxcsn )
3274                         ber_bvarray_free( si->si_ctxcsn );
3275                 if ( si->si_sids )
3276                         ch_free( si->si_sids );
3277                 ldap_pvt_thread_mutex_destroy( &si->si_resp_mutex );
3278                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
3279                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
3280                 ldap_pvt_thread_rdwr_destroy( &si->si_csn_rwlock );
3281                 ch_free( si );
3282         }
3283
3284         return 0;
3285 }
3286
3287 static int syncprov_parseCtrl (
3288         Operation *op,
3289         SlapReply *rs,
3290         LDAPControl *ctrl )
3291 {
3292         ber_tag_t tag;
3293         BerElementBuffer berbuf;
3294         BerElement *ber = (BerElement *)&berbuf;
3295         ber_int_t mode;
3296         ber_len_t len;
3297         struct berval cookie = BER_BVNULL;
3298         sync_control *sr;
3299         int rhint = 0;
3300
3301         if ( op->o_sync != SLAP_CONTROL_NONE ) {
3302                 rs->sr_text = "Sync control specified multiple times";
3303                 return LDAP_PROTOCOL_ERROR;
3304         }
3305
3306         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
3307                 rs->sr_text = "Sync control specified with pagedResults control";
3308                 return LDAP_PROTOCOL_ERROR;
3309         }
3310
3311         if ( BER_BVISNULL( &ctrl->ldctl_value ) ) {
3312                 rs->sr_text = "Sync control value is absent";
3313                 return LDAP_PROTOCOL_ERROR;
3314         }
3315
3316         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
3317                 rs->sr_text = "Sync control value is empty";
3318                 return LDAP_PROTOCOL_ERROR;
3319         }
3320
3321         /* Parse the control value
3322          *      syncRequestValue ::= SEQUENCE {
3323          *              mode   ENUMERATED {
3324          *                      -- 0 unused
3325          *                      refreshOnly             (1),
3326          *                      -- 2 reserved
3327          *                      refreshAndPersist       (3)
3328          *              },
3329          *              cookie  syncCookie OPTIONAL
3330          *      }
3331          */
3332
3333         ber_init2( ber, &ctrl->ldctl_value, 0 );
3334
3335         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
3336                 rs->sr_text = "Sync control : mode decoding error";
3337                 return LDAP_PROTOCOL_ERROR;
3338         }
3339
3340         switch( mode ) {
3341         case LDAP_SYNC_REFRESH_ONLY:
3342                 mode = SLAP_SYNC_REFRESH;
3343                 break;
3344         case LDAP_SYNC_REFRESH_AND_PERSIST:
3345                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
3346                 break;
3347         default:
3348                 rs->sr_text = "Sync control : unknown update mode";
3349                 return LDAP_PROTOCOL_ERROR;
3350         }
3351
3352         tag = ber_peek_tag( ber, &len );
3353
3354         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
3355                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
3356                         rs->sr_text = "Sync control : cookie decoding error";
3357                         return LDAP_PROTOCOL_ERROR;
3358                 }
3359                 tag = ber_peek_tag( ber, &len );
3360         }
3361         if ( tag == LDAP_TAG_RELOAD_HINT ) {
3362                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
3363                         rs->sr_text = "Sync control : rhint decoding error";
3364                         return LDAP_PROTOCOL_ERROR;
3365                 }
3366         }
3367         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
3368                         rs->sr_text = "Sync control : decoding error";
3369                         return LDAP_PROTOCOL_ERROR;
3370         }
3371         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
3372         sr->sr_rhint = rhint;
3373         if (!BER_BVISNULL(&cookie)) {
3374                 ber_dupbv_x( &sr->sr_state.octet_str, &cookie, op->o_tmpmemctx );
3375                 /* If parse fails, pretend no cookie was sent */
3376                 if ( slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx ) ||
3377                         sr->sr_state.rid == -1 ) {
3378                         if ( sr->sr_state.ctxcsn ) {
3379                                 ber_bvarray_free_x( sr->sr_state.ctxcsn, op->o_tmpmemctx );
3380                                 sr->sr_state.ctxcsn = NULL;
3381                         }
3382                         sr->sr_state.numcsns = 0;
3383                 }
3384         }
3385
3386         op->o_controls[slap_cids.sc_LDAPsync] = sr;
3387
3388         op->o_sync = ctrl->ldctl_iscritical
3389                 ? SLAP_CONTROL_CRITICAL
3390                 : SLAP_CONTROL_NONCRITICAL;
3391
3392         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
3393
3394         return LDAP_SUCCESS;
3395 }
3396
3397 /* This overlay is set up for dynamic loading via moduleload. For static
3398  * configuration, you'll need to arrange for the slap_overinst to be
3399  * initialized and registered by some other function inside slapd.
3400  */
3401
3402 static slap_overinst            syncprov;
3403
3404 int
3405 syncprov_initialize()
3406 {
3407         int rc;
3408
3409         rc = register_supported_control( LDAP_CONTROL_SYNC,
3410                 SLAP_CTRL_SEARCH, NULL,
3411                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
3412         if ( rc != LDAP_SUCCESS ) {
3413                 Debug( LDAP_DEBUG_ANY,
3414                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
3415                 return rc;
3416         }
3417
3418         syncprov.on_bi.bi_type = "syncprov";
3419         syncprov.on_bi.bi_db_init = syncprov_db_init;
3420         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
3421         syncprov.on_bi.bi_db_open = syncprov_db_open;
3422         syncprov.on_bi.bi_db_close = syncprov_db_close;
3423
3424         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
3425         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
3426
3427         syncprov.on_bi.bi_op_add = syncprov_op_mod;
3428         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
3429         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
3430         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
3431         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
3432         syncprov.on_bi.bi_op_search = syncprov_op_search;
3433         syncprov.on_bi.bi_extended = syncprov_op_extended;
3434         syncprov.on_bi.bi_operational = syncprov_operational;
3435
3436         syncprov.on_bi.bi_cf_ocs = spocs;
3437
3438         generic_filter.f_desc = slap_schema.si_ad_objectClass;
3439
3440         rc = config_register_schema( spcfg, spocs );
3441         if ( rc ) return rc;
3442
3443         return overlay_register( &syncprov );
3444 }
3445
3446 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
3447 int
3448 init_module( int argc, char *argv[] )
3449 {
3450         return syncprov_initialize();
3451 }
3452 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
3453
3454 #endif /* defined(SLAPD_OVER_SYNCPROV) */