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 2004-2018 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         int             sl_playing;
 134         slog_entry *sl_head;
 135         slog_entry *sl_tail;
 136         ldap_pvt_thread_mutex_t sl_mutex;
 137 } sessionlog;
 138
 139 /* The main state for this overlay */
 140 typedef struct syncprov_info_t {
 141         syncops         *si_ops;
 142         struct berval   si_contextdn;
 143         BerVarray       si_ctxcsn;      /* ldapsync context */
 144         int             *si_sids;
 145         int             si_numcsns;
 146         int             si_chkops;      /* checkpointing info */
 147         int             si_chktime;
 148         int             si_numops;      /* number of ops since last checkpoint */
 149         int             si_nopres;      /* Skip present phase */
 150         int             si_usehint;     /* use reload hint */
 151         int             si_active;      /* True if there are active mods */
 152         int             si_dirty;       /* True if the context is dirty, i.e changes
 153                                                  * have been made without updating the csn. */
 154         time_t  si_chklast;     /* time of last checkpoint */
 155         Avlnode *si_mods;       /* entries being modified */
 156         sessionlog      *si_logs;
 157         ldap_pvt_thread_rdwr_t  si_csn_rwlock;
 158         ldap_pvt_thread_mutex_t si_ops_mutex;
 159         ldap_pvt_thread_mutex_t si_mods_mutex;
 160         ldap_pvt_thread_mutex_t si_resp_mutex;
 161 } syncprov_info_t;
 162
 163 typedef struct opcookie {
 164         slap_overinst *son;
 165         syncmatches *smatches;
 166         modtarget *smt;
 167         Entry *se;
 168         struct berval sdn;      /* DN of entry, for deletes */
 169         struct berval sndn;
 170         struct berval suuid;    /* UUID of entry */
 171         struct berval sctxcsn;
 172         short osid;     /* sid of op csn */
 173         short rsid;     /* sid of relay */
 174         short sreference;       /* Is the entry a reference? */
 175         syncres ssres;
 176 } opcookie;
 177
 178 typedef struct fbase_cookie {
 179         struct berval *fdn;     /* DN of a modified entry, for scope testing */
 180         syncops *fss;   /* persistent search we're testing against */
 181         int fbase;      /* if TRUE we found the search base and it's still valid */
 182         int fscope;     /* if TRUE then fdn is within the psearch scope */
 183 } fbase_cookie;
 184
 185 static AttributeName csn_anlist[3];
 186 static AttributeName uuid_anlist[2];
 187
 188 /* Build a LDAPsync intermediate state control */
 189 static int
 190 syncprov_state_ctrl(
 191         Operation       *op,
 192         SlapReply       *rs,
 193         Entry           *e,
 194         int             entry_sync_state,
 195         LDAPControl     **ctrls,
 196         int             num_ctrls,
 197         int             send_cookie,
 198         struct berval   *cookie )
 199 {
 200         Attribute* a;
 201         int ret;
 202
 203         BerElementBuffer berbuf;
 204         BerElement *ber = (BerElement *)&berbuf;
 205         LDAPControl *cp;
 206         struct berval bv;
 207         struct berval   entryuuid_bv = BER_BVNULL;
 208
 209         ber_init2( ber, 0, LBER_USE_DER );
 210         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 211
 212         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 213                 AttributeDescription *desc = a->a_desc;
 214                 if ( desc == slap_schema.si_ad_entryUUID ) {
 215                         entryuuid_bv = a->a_nvals[0];
 216                         break;
 217                 }
 218         }
 219
 220         /* FIXME: what if entryuuid is NULL or empty ? */
 221
 222         if ( send_cookie && cookie ) {
 223                 ber_printf( ber, "{eOON}",
 224                         entry_sync_state, &entryuuid_bv, cookie );
 225         } else {
 226                 ber_printf( ber, "{eON}",
 227                         entry_sync_state, &entryuuid_bv );
 228         }
 229
 230         ret = ber_flatten2( ber, &bv, 0 );
 231         if ( ret == 0 ) {
 232                 cp = op->o_tmpalloc( sizeof( LDAPControl ) + bv.bv_len, op->o_tmpmemctx );
 233                 cp->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 234                 cp->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 235                 cp->ldctl_value.bv_val = (char *)&cp[1];
 236                 cp->ldctl_value.bv_len = bv.bv_len;
 237                 AC_MEMCPY( cp->ldctl_value.bv_val, bv.bv_val, bv.bv_len );
 238                 ctrls[num_ctrls] = cp;
 239         }
 240         ber_free_buf( ber );
 241
 242         if ( ret < 0 ) {
 243                 Debug( LDAP_DEBUG_TRACE,
 244                         "slap_build_sync_ctrl: ber_flatten2 failed (%d)\n",
 245                         ret, 0, 0 );
 246                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 247                 return LDAP_OTHER;
 248         }
 249
 250         return LDAP_SUCCESS;
 251 }
 252
 253 /* Build a LDAPsync final state control */
 254 static int
 255 syncprov_done_ctrl(
 256         Operation       *op,
 257         SlapReply       *rs,
 258         LDAPControl     **ctrls,
 259         int                     num_ctrls,
 260         int                     send_cookie,
 261         struct berval *cookie,
 262         int                     refreshDeletes )
 263 {
 264         int ret;
 265         BerElementBuffer berbuf;
 266         BerElement *ber = (BerElement *)&berbuf;
 267         LDAPControl *cp;
 268         struct berval bv;
 269
 270         ber_init2( ber, NULL, LBER_USE_DER );
 271         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 272
 273         ber_printf( ber, "{" );
 274         if ( send_cookie && cookie ) {
 275                 ber_printf( ber, "O", cookie );
 276         }
 277         if ( refreshDeletes == LDAP_SYNC_REFRESH_DELETES ) {
 278                 ber_printf( ber, "b", refreshDeletes );
 279         }
 280         ber_printf( ber, "N}" );
 281
 282         ret = ber_flatten2( ber, &bv, 0 );
 283         if ( ret == 0 ) {
 284                 cp = op->o_tmpalloc( sizeof( LDAPControl ) + bv.bv_len, op->o_tmpmemctx );
 285                 cp->ldctl_oid = LDAP_CONTROL_SYNC_DONE;
 286                 cp->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 287                 cp->ldctl_value.bv_val = (char *)&cp[1];
 288                 cp->ldctl_value.bv_len = bv.bv_len;
 289                 AC_MEMCPY( cp->ldctl_value.bv_val, bv.bv_val, bv.bv_len );
 290                 ctrls[num_ctrls] = cp;
 291         }
 292
 293         ber_free_buf( ber );
 294
 295         if ( ret < 0 ) {
 296                 Debug( LDAP_DEBUG_TRACE,
 297                         "syncprov_done_ctrl: ber_flatten2 failed (%d)\n",
 298                         ret, 0, 0 );
 299                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 300                 return LDAP_OTHER;
 301         }
 302
 303         return LDAP_SUCCESS;
 304 }
 305
 306 static int
 307 syncprov_sendinfo(
 308         Operation       *op,
 309         SlapReply       *rs,
 310         int                     type,
 311         struct berval *cookie,
 312         int                     refreshDone,
 313         BerVarray       syncUUIDs,
 314         int                     refreshDeletes )
 315 {
 316         BerElementBuffer berbuf;
 317         BerElement *ber = (BerElement *)&berbuf;
 318         struct berval rspdata;
 319
 320         int ret;
 321
 322         ber_init2( ber, NULL, LBER_USE_DER );
 323         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 324
 325         if ( type ) {
 326                 switch ( type ) {
 327                 case LDAP_TAG_SYNC_NEW_COOKIE:
 328                         ber_printf( ber, "tO", type, cookie );
 329                         break;
 330                 case LDAP_TAG_SYNC_REFRESH_DELETE:
 331                 case LDAP_TAG_SYNC_REFRESH_PRESENT:
 332                         ber_printf( ber, "t{", type );
 333                         if ( cookie ) {
 334                                 ber_printf( ber, "O", cookie );
 335                         }
 336                         if ( refreshDone == 0 ) {
 337                                 ber_printf( ber, "b", refreshDone );
 338                         }
 339                         ber_printf( ber, "N}" );
 340                         break;
 341                 case LDAP_TAG_SYNC_ID_SET:
 342                         ber_printf( ber, "t{", type );
 343                         if ( cookie ) {
 344                                 ber_printf( ber, "O", cookie );
 345                         }
 346                         if ( refreshDeletes == 1 ) {
 347                                 ber_printf( ber, "b", refreshDeletes );
 348                         }
 349                         ber_printf( ber, "[W]", syncUUIDs );
 350                         ber_printf( ber, "N}" );
 351                         break;
 352                 default:
 353                         Debug( LDAP_DEBUG_TRACE,
 354                                 "syncprov_sendinfo: invalid syncinfo type (%d)\n",
 355                                 type, 0, 0 );
 356                         return LDAP_OTHER;
 357                 }
 358         }
 359
 360         ret = ber_flatten2( ber, &rspdata, 0 );
 361
 362         if ( ret < 0 ) {
 363                 Debug( LDAP_DEBUG_TRACE,
 364                         "syncprov_sendinfo: ber_flatten2 failed (%d)\n",
 365                         ret, 0, 0 );
 366                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 367                 return LDAP_OTHER;
 368         }
 369
 370         rs->sr_rspoid = LDAP_SYNC_INFO;
 371         rs->sr_rspdata = &rspdata;
 372         send_ldap_intermediate( op, rs );
 373         rs->sr_rspdata = NULL;
 374         ber_free_buf( ber );
 375
 376         return LDAP_SUCCESS;
 377 }
 378
 379 /* Find a modtarget in an AVL tree */
 380 static int
 381 sp_avl_cmp( const void *c1, const void *c2 )
 382 {
 383         const modtarget *m1, *m2;
 384         int rc;
 385
 386         m1 = c1; m2 = c2;
 387         rc = m1->mt_dn.bv_len - m2->mt_dn.bv_len;
 388
 389         if ( rc ) return rc;
 390         return ber_bvcmp( &m1->mt_dn, &m2->mt_dn );
 391 }
 392
 393 /* syncprov_findbase:
 394  *   finds the true DN of the base of a search (with alias dereferencing) and
 395  * checks to make sure the base entry doesn't get replaced with a different
 396  * entry (e.g., swapping trees via ModDN, or retargeting an alias). If a
 397  * change is detected, any persistent search on this base must be terminated /
 398  * reloaded.
 399  *   On the first call, we just save the DN and entryID. On subsequent calls
 400  * we compare the DN and entryID with the saved values.
 401  */
 402 static int
 403 findbase_cb( Operation *op, SlapReply *rs )
 404 {
 405         slap_callback *sc = op->o_callback;
 406
 407         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 408                 fbase_cookie *fc = sc->sc_private;
 409
 410                 /* If no entryID, we're looking for the first time.
 411                  * Just store whatever we got.
 412                  */
 413                 if ( fc->fss->s_eid == NOID ) {
 414                         fc->fbase = 2;
 415                         fc->fss->s_eid = rs->sr_entry->e_id;
 416                         ber_dupbv( &fc->fss->s_base, &rs->sr_entry->e_nname );
 417
 418                 } else if ( rs->sr_entry->e_id == fc->fss->s_eid &&
 419                         dn_match( &rs->sr_entry->e_nname, &fc->fss->s_base )) {
 420
 421                 /* OK, the DN is the same and the entryID is the same. */
 422                         fc->fbase = 1;
 423                 }
 424         }
 425         if ( rs->sr_err != LDAP_SUCCESS ) {
 426                 Debug( LDAP_DEBUG_ANY, "findbase failed! %d\n", rs->sr_err,0,0 );
 427         }
 428         return LDAP_SUCCESS;
 429 }
 430
 431 static Filter generic_filter = { LDAP_FILTER_PRESENT, { 0 }, NULL };
 432 static struct berval generic_filterstr = BER_BVC("(objectclass=*)");
 433
 434 static int
 435 syncprov_findbase( Operation *op, fbase_cookie *fc )
 436 {
 437         /* Use basic parameters from syncrepl search, but use
 438          * current op's threadctx / tmpmemctx
 439          */
 440         ldap_pvt_thread_mutex_lock( &fc->fss->s_mutex );
 441         if ( fc->fss->s_flags & PS_FIND_BASE ) {
 442                 slap_callback cb = {0};
 443                 Operation fop;
 444                 SlapReply frs = { REP_RESULT };
 445                 int rc;
 446
 447                 fc->fss->s_flags ^= PS_FIND_BASE;
 448                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 449
 450                 fop = *fc->fss->s_op;
 451
 452                 fop.o_bd = fop.o_bd->bd_self;
 453                 fop.o_hdr = op->o_hdr;
 454                 fop.o_time = op->o_time;
 455                 fop.o_tincr = op->o_tincr;
 456                 fop.o_extra = op->o_extra;
 457
 458                 cb.sc_response = findbase_cb;
 459                 cb.sc_private = fc;
 460
 461                 fop.o_sync_mode = 0;    /* turn off sync mode */
 462                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 463                 fop.o_callback = &cb;
 464                 fop.o_tag = LDAP_REQ_SEARCH;
 465                 fop.ors_scope = LDAP_SCOPE_BASE;
 466                 fop.ors_limit = NULL;
 467                 fop.ors_slimit = 1;
 468                 fop.ors_tlimit = SLAP_NO_LIMIT;
 469                 fop.ors_attrs = slap_anlist_no_attrs;
 470                 fop.ors_attrsonly = 1;
 471                 fop.ors_filter = &generic_filter;
 472                 fop.ors_filterstr = generic_filterstr;
 473
 474                 rc = fop.o_bd->be_search( &fop, &frs );
 475         } else {
 476                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 477                 fc->fbase = 1;
 478         }
 479
 480         /* After the first call, see if the fdn resides in the scope */
 481         if ( fc->fbase == 1 ) {
 482                 switch ( fc->fss->s_op->ors_scope ) {
 483                 case LDAP_SCOPE_BASE:
 484                         fc->fscope = dn_match( fc->fdn, &fc->fss->s_base );
 485                         break;
 486                 case LDAP_SCOPE_ONELEVEL: {
 487                         struct berval pdn;
 488                         dnParent( fc->fdn, &pdn );
 489                         fc->fscope = dn_match( &pdn, &fc->fss->s_base );
 490                         break; }
 491                 case LDAP_SCOPE_SUBTREE:
 492                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base );
 493                         break;
 494                 case LDAP_SCOPE_SUBORDINATE:
 495                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base ) &&
 496                                 !dn_match( fc->fdn, &fc->fss->s_base );
 497                         break;
 498                 }
 499         }
 500
 501         if ( fc->fbase )
 502                 return LDAP_SUCCESS;
 503
 504         /* If entryID has changed, then the base of this search has
 505          * changed. Invalidate the psearch.
 506          */
 507         return LDAP_NO_SUCH_OBJECT;
 508 }
 509
 510 /* syncprov_findcsn:
 511  *   This function has three different purposes, but they all use a search
 512  * that filters on entryCSN so they're combined here.
 513  * 1: at startup time, after a contextCSN has been read from the database,
 514  * we search for all entries with CSN >= contextCSN in case the contextCSN
 515  * was not checkpointed at the previous shutdown.
 516  *
 517  * 2: when the current contextCSN is known and we have a sync cookie, we search
 518  * for one entry with CSN = the cookie CSN. If not found, try <= cookie CSN.
 519  * If an entry is found, the cookie CSN is valid, otherwise it is stale.
 520  *
 521  * 3: during a refresh phase, we search for all entries with CSN <= the cookie
 522  * CSN, and generate Present records for them. We always collect this result
 523  * in SyncID sets, even if there's only one match.
 524  */
 525 typedef enum find_csn_t {
 526         FIND_MAXCSN     = 1,
 527         FIND_CSN        = 2,
 528         FIND_PRESENT    = 3
 529 } find_csn_t;
 530
 531 static int
 532 findmax_cb( Operation *op, SlapReply *rs )
 533 {
 534         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 535                 struct berval *maxcsn = op->o_callback->sc_private;
 536                 Attribute *a = attr_find( rs->sr_entry->e_attrs,
 537                         slap_schema.si_ad_entryCSN );
 538
 539                 if ( a && ber_bvcmp( &a->a_vals[0], maxcsn ) > 0 &&
 540                         slap_parse_csn_sid( &a->a_vals[0] ) == slap_serverID ) {
 541                         maxcsn->bv_len = a->a_vals[0].bv_len;
 542                         strcpy( maxcsn->bv_val, a->a_vals[0].bv_val );
 543                 }
 544         }
 545         return LDAP_SUCCESS;
 546 }
 547
 548 static int
 549 findcsn_cb( Operation *op, SlapReply *rs )
 550 {
 551         slap_callback *sc = op->o_callback;
 552
 553         /* We just want to know that at least one exists, so it's OK if
 554          * we exceed the unchecked limit.
 555          */
 556         if ( rs->sr_err == LDAP_ADMINLIMIT_EXCEEDED ||
 557                 (rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS )) {
 558                 sc->sc_private = (void *)1;
 559         }
 560         return LDAP_SUCCESS;
 561 }
 562
 563 /* Build a list of entryUUIDs for sending in a SyncID set */
 564
 565 #define UUID_LEN        16
 566
 567 typedef struct fpres_cookie {
 568         int num;
 569         BerVarray uuids;
 570         char *last;
 571 } fpres_cookie;
 572
 573 static int
 574 findpres_cb( Operation *op, SlapReply *rs )
 575 {
 576         slap_callback *sc = op->o_callback;
 577         fpres_cookie *pc = sc->sc_private;
 578         Attribute *a;
 579         int ret = SLAP_CB_CONTINUE;
 580
 581         switch ( rs->sr_type ) {
 582         case REP_SEARCH:
 583                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryUUID );
 584                 if ( a ) {
 585                         pc->uuids[pc->num].bv_val = pc->last;
 586                         AC_MEMCPY( pc->uuids[pc->num].bv_val, a->a_nvals[0].bv_val,
 587                                 pc->uuids[pc->num].bv_len );
 588                         pc->num++;
 589                         pc->last = pc->uuids[pc->num].bv_val;
 590                         pc->uuids[pc->num].bv_val = NULL;
 591                 }
 592                 ret = LDAP_SUCCESS;
 593                 if ( pc->num != SLAP_SYNCUUID_SET_SIZE )
 594                         break;
 595                 /* FALLTHRU */
 596         case REP_RESULT:
 597                 ret = rs->sr_err;
 598                 if ( pc->num ) {
 599                         ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 600                                 0, pc->uuids, 0 );
 601                         pc->uuids[pc->num].bv_val = pc->last;
 602                         pc->num = 0;
 603                         pc->last = pc->uuids[0].bv_val;
 604                 }
 605                 break;
 606         default:
 607                 break;
 608         }
 609         return ret;
 610 }
 611
 612 static int
 613 syncprov_findcsn( Operation *op, find_csn_t mode, struct berval *csn )
 614 {
 615         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 616         syncprov_info_t         *si = on->on_bi.bi_private;
 617
 618         slap_callback cb = {0};
 619         Operation fop;
 620         SlapReply frs = { REP_RESULT };
 621         char buf[LDAP_PVT_CSNSTR_BUFSIZE + STRLENOF("(entryCSN<=)")];
 622         char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
 623         struct berval maxcsn;
 624         Filter cf;
 625         AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
 626         fpres_cookie pcookie;
 627         sync_control *srs = NULL;
 628         struct slap_limits_set fc_limits;
 629         int i, rc = LDAP_SUCCESS, findcsn_retry = 1;
 630         int maxid;
 631
 632         if ( mode != FIND_MAXCSN ) {
 633                 srs = op->o_controls[slap_cids.sc_LDAPsync];
 634         }
 635
 636         fop = *op;
 637         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync_mode */
 638         /* We want pure entries, not referrals */
 639         fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 640
 641         cf.f_ava = &eq;
 642         cf.f_av_desc = slap_schema.si_ad_entryCSN;
 643         BER_BVZERO( &cf.f_av_value );
 644         cf.f_next = NULL;
 645
 646         fop.o_callback = &cb;
 647         fop.ors_limit = NULL;
 648         fop.ors_tlimit = SLAP_NO_LIMIT;
 649         fop.ors_filter = &cf;
 650         fop.ors_filterstr.bv_val = buf;
 651
 652 again:
 653         switch( mode ) {
 654         case FIND_MAXCSN:
 655                 cf.f_choice = LDAP_FILTER_GE;
 656                 /* If there are multiple CSNs, use the one with our serverID */
 657                 for ( i=0; i<si->si_numcsns; i++) {
 658                         if ( slap_serverID == si->si_sids[i] ) {
 659                                 maxid = i;
 660                                 break;
 661                         }
 662                 }
 663                 if ( i == si->si_numcsns ) {
 664                         /* No match: this is multimaster, and none of the content in the DB
 665                          * originated locally. Treat like no CSN.
 666                          */
 667                         return LDAP_NO_SUCH_OBJECT;
 668                 }
 669                 cf.f_av_value = si->si_ctxcsn[maxid];
 670                 fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 671                         "(entryCSN>=%s)", cf.f_av_value.bv_val );
 672                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 673                         return LDAP_OTHER;
 674                 }
 675                 fop.ors_attrsonly = 0;
 676                 fop.ors_attrs = csn_anlist;
 677                 fop.ors_slimit = SLAP_NO_LIMIT;
 678                 cb.sc_private = &maxcsn;
 679                 cb.sc_response = findmax_cb;
 680                 strcpy( cbuf, cf.f_av_value.bv_val );
 681                 maxcsn.bv_val = cbuf;
 682                 maxcsn.bv_len = cf.f_av_value.bv_len;
 683                 break;
 684         case FIND_CSN:
 685                 if ( BER_BVISEMPTY( &cf.f_av_value )) {
 686                         cf.f_av_value = *csn;
 687                 }
 688                 fop.o_dn = op->o_bd->be_rootdn;
 689                 fop.o_ndn = op->o_bd->be_rootndn;
 690                 fop.o_req_dn = op->o_bd->be_suffix[0];
 691                 fop.o_req_ndn = op->o_bd->be_nsuffix[0];
 692                 /* Look for exact match the first time */
 693                 if ( findcsn_retry ) {
 694                         cf.f_choice = LDAP_FILTER_EQUALITY;
 695                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 696                                 "(entryCSN=%s)", cf.f_av_value.bv_val );
 697                 /* On retry, look for <= */
 698                 } else {
 699                         cf.f_choice = LDAP_FILTER_LE;
 700                         fop.ors_limit = &fc_limits;
 701                         memset( &fc_limits, 0, sizeof( fc_limits ));
 702                         fc_limits.lms_s_unchecked = 1;
 703                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 704                                 "(entryCSN<=%s)", cf.f_av_value.bv_val );
 705                 }
 706                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 707                         return LDAP_OTHER;
 708                 }
 709                 fop.ors_attrsonly = 1;
 710                 fop.ors_attrs = slap_anlist_no_attrs;
 711                 fop.ors_slimit = 1;
 712                 cb.sc_private = NULL;
 713                 cb.sc_response = findcsn_cb;
 714                 break;
 715         case FIND_PRESENT:
 716                 fop.ors_filter = op->ors_filter;
 717                 fop.ors_filterstr = op->ors_filterstr;
 718                 fop.ors_attrsonly = 0;
 719                 fop.ors_attrs = uuid_anlist;
 720                 fop.ors_slimit = SLAP_NO_LIMIT;
 721                 cb.sc_private = &pcookie;
 722                 cb.sc_response = findpres_cb;
 723                 pcookie.num = 0;
 724
 725                 /* preallocate storage for a full set */
 726                 pcookie.uuids = op->o_tmpalloc( (SLAP_SYNCUUID_SET_SIZE+1) *
 727                         sizeof(struct berval) + SLAP_SYNCUUID_SET_SIZE * UUID_LEN,
 728                         op->o_tmpmemctx );
 729                 pcookie.last = (char *)(pcookie.uuids + SLAP_SYNCUUID_SET_SIZE+1);
 730                 pcookie.uuids[0].bv_val = pcookie.last;
 731                 pcookie.uuids[0].bv_len = UUID_LEN;
 732                 for (i=1; i<SLAP_SYNCUUID_SET_SIZE; i++) {
 733                         pcookie.uuids[i].bv_val = pcookie.uuids[i-1].bv_val + UUID_LEN;
 734                         pcookie.uuids[i].bv_len = UUID_LEN;
 735                 }
 736                 break;
 737         }
 738
 739         fop.o_bd->bd_info = (BackendInfo *)on->on_info;
 740         fop.o_bd->be_search( &fop, &frs );
 741         fop.o_bd->bd_info = (BackendInfo *)on;
 742
 743         switch( mode ) {
 744         case FIND_MAXCSN:
 745                 if ( ber_bvcmp( &si->si_ctxcsn[maxid], &maxcsn )) {
 746 #ifdef CHECK_CSN
 747                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
 748                         assert( !syn->ssyn_validate( syn, &maxcsn ));
 749 #endif
 750                         ber_bvreplace( &si->si_ctxcsn[maxid], &maxcsn );
 751                         si->si_numops++;        /* ensure a checkpoint */
 752                 }
 753                 break;
 754         case FIND_CSN:
 755                 /* If matching CSN was not found, invalidate the context. */
 756                 if ( !cb.sc_private ) {
 757                         /* If we didn't find an exact match, then try for <= */
 758                         if ( findcsn_retry ) {
 759                                 findcsn_retry = 0;
 760                                 rs_reinit( &frs, REP_RESULT );
 761                                 goto again;
 762                         }
 763                         rc = LDAP_NO_SUCH_OBJECT;
 764                 }
 765                 break;
 766         case FIND_PRESENT:
 767                 op->o_tmpfree( pcookie.uuids, op->o_tmpmemctx );
 768                 break;
 769         }
 770
 771         return rc;
 772 }
 773
 774 static void free_resinfo( syncres *sr )
 775 {
 776         syncres **st;
 777         int freeit = 0;
 778         ldap_pvt_thread_mutex_lock( &sr->s_info->ri_mutex );
 779         for (st = &sr->s_info->ri_list; *st; st = &(*st)->s_rilist) {
 780                 if (*st == sr) {
 781                         *st = sr->s_rilist;
 782                         break;
 783                 }
 784         }
 785         if ( !sr->s_info->ri_list )
 786                 freeit = 1;
 787         ldap_pvt_thread_mutex_unlock( &sr->s_info->ri_mutex );
 788         if ( freeit ) {
 789                 ldap_pvt_thread_mutex_destroy( &sr->s_info->ri_mutex );
 790                 if ( sr->s_info->ri_e )
 791                         entry_free( sr->s_info->ri_e );
 792                 if ( !BER_BVISNULL( &sr->s_info->ri_cookie ))
 793                         ch_free( sr->s_info->ri_cookie.bv_val );
 794                 ch_free( sr->s_info );
 795         }
 796 }
 797
 798 static int
 799 syncprov_free_syncop( syncops *so, int unlink )
 800 {
 801         syncres *sr, *srnext;
 802         GroupAssertion *ga, *gnext;
 803
 804         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 805         /* already being freed, or still in use */
 806         if ( !so->s_inuse || --so->s_inuse > 0 ) {
 807                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 808                 return 0;
 809         }
 810         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 811         if ( unlink ) {
 812                 syncops **sop;
 813                 ldap_pvt_thread_mutex_lock( &so->s_si->si_ops_mutex );
 814                 for ( sop = &so->s_si->si_ops; *sop; sop = &(*sop)->s_next ) {
 815                         if ( *sop == so ) {
 816                                 *sop = so->s_next;
 817                                 break;
 818                         }
 819                 }
 820                 ldap_pvt_thread_mutex_unlock( &so->s_si->si_ops_mutex );
 821         }
 822         if ( so->s_flags & PS_IS_DETACHED ) {
 823                 filter_free( so->s_op->ors_filter );
 824                 for ( ga = so->s_op->o_groups; ga; ga=gnext ) {
 825                         gnext = ga->ga_next;
 826                         ch_free( ga );
 827                 }
 828                 ch_free( so->s_op );
 829         }
 830         ch_free( so->s_base.bv_val );
 831         for ( sr=so->s_res; sr; sr=srnext ) {
 832                 srnext = sr->s_next;
 833                 free_resinfo( sr );
 834                 ch_free( sr );
 835         }
 836         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 837         ch_free( so );
 838         return 1;
 839 }
 840
 841 /* Send a persistent search response */
 842 static int
 843 syncprov_sendresp( Operation *op, resinfo *ri, syncops *so, int mode )
 844 {
 845         SlapReply rs = { REP_SEARCH };
 846         struct berval cookie, csns[2];
 847         Entry e_uuid = {0};
 848         Attribute a_uuid = {0};
 849
 850         if ( so->s_op->o_abandon )
 851                 return SLAPD_ABANDON;
 852
 853         rs.sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2, op->o_tmpmemctx );
 854         rs.sr_ctrls[1] = NULL;
 855         rs.sr_flags = REP_CTRLS_MUSTBEFREED;
 856         csns[0] = ri->ri_csn;
 857         BER_BVZERO( &csns[1] );
 858         slap_compose_sync_cookie( op, &cookie, csns, so->s_rid, slap_serverID ? slap_serverID : -1 );
 859
 860 #ifdef LDAP_DEBUG
 861         if ( so->s_sid > 0 ) {
 862                 Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: to=%03x, cookie=%s\n",
 863                         so->s_sid, cookie.bv_val, 0 );
 864         } else {
 865                 Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: cookie=%s\n",
 866                         cookie.bv_val, 0, 0 );
 867         }
 868 #endif
 869
 870         e_uuid.e_attrs = &a_uuid;
 871         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 872         a_uuid.a_nvals = &ri->ri_uuid;
 873         rs.sr_err = syncprov_state_ctrl( op, &rs, &e_uuid,
 874                 mode, rs.sr_ctrls, 0, 1, &cookie );
 875         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
 876
 877         rs.sr_entry = &e_uuid;
 878         if ( mode == LDAP_SYNC_ADD || mode == LDAP_SYNC_MODIFY ) {
 879                 e_uuid = *ri->ri_e;
 880                 e_uuid.e_private = NULL;
 881         }
 882
 883         switch( mode ) {
 884         case LDAP_SYNC_ADD:
 885                 if ( ri->ri_isref && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 886                         rs.sr_ref = get_entry_referrals( op, rs.sr_entry );
 887                         rs.sr_err = send_search_reference( op, &rs );
 888                         ber_bvarray_free( rs.sr_ref );
 889                         break;
 890                 }
 891                 /* fallthru */
 892         case LDAP_SYNC_MODIFY:
 893                 rs.sr_attrs = op->ors_attrs;
 894                 rs.sr_err = send_search_entry( op, &rs );
 895                 break;
 896         case LDAP_SYNC_DELETE:
 897                 e_uuid.e_attrs = NULL;
 898                 e_uuid.e_name = ri->ri_dn;
 899                 e_uuid.e_nname = ri->ri_ndn;
 900                 if ( ri->ri_isref && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 901                         struct berval bv = BER_BVNULL;
 902                         rs.sr_ref = &bv;
 903                         rs.sr_err = send_search_reference( op, &rs );
 904                 } else {
 905                         rs.sr_err = send_search_entry( op, &rs );
 906                 }
 907                 break;
 908         default:
 909                 assert(0);
 910         }
 911         return rs.sr_err;
 912 }
 913
 914 static void
 915 syncprov_qstart( syncops *so );
 916
 917 /* Play back queued responses */
 918 static int
 919 syncprov_qplay( Operation *op, syncops *so )
 920 {
 921         syncres *sr;
 922         int rc = 0;
 923
 924         do {
 925                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 926                 sr = so->s_res;
 927                 /* Exit loop with mutex held */
 928                 if ( !sr )
 929                         break;
 930                 so->s_res = sr->s_next;
 931                 if ( !so->s_res )
 932                         so->s_restail = NULL;
 933                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 934
 935                 if ( !so->s_op->o_abandon ) {
 936
 937                         if ( sr->s_mode == LDAP_SYNC_NEW_COOKIE ) {
 938                                 SlapReply rs = { REP_INTERMEDIATE };
 939
 940                                 rc = syncprov_sendinfo( op, &rs, LDAP_TAG_SYNC_NEW_COOKIE,
 941                                         &sr->s_info->ri_cookie, 0, NULL, 0 );
 942                         } else {
 943                                 rc = syncprov_sendresp( op, sr->s_info, so, sr->s_mode );
 944                         }
 945                 }
 946
 947                 free_resinfo( sr );
 948                 ch_free( sr );
 949
 950                 if ( so->s_op->o_abandon )
 951                         continue;
 952
 953                 /* Exit loop with mutex held */
 954                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 955                 break;
 956
 957         } while (1);
 958
 959         /* We now only send one change at a time, to prevent one
 960          * psearch from hogging all the CPU. Resubmit this task if
 961          * there are more responses queued and no errors occurred.
 962          */
 963
 964         if ( rc == 0 && so->s_res ) {
 965                 syncprov_qstart( so );
 966         } else {
 967                 so->s_flags ^= PS_TASK_QUEUED;
 968         }
 969
 970         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 971         return rc;
 972 }
 973
 974 /* task for playing back queued responses */
 975 static void *
 976 syncprov_qtask( void *ctx, void *arg )
 977 {
 978         syncops *so = arg;
 979         OperationBuffer opbuf;
 980         Operation *op;
 981         BackendDB be;
 982         int rc;
 983
 984         op = &opbuf.ob_op;
 985         *op = *so->s_op;
 986         op->o_hdr = &opbuf.ob_hdr;
 987         op->o_controls = opbuf.ob_controls;
 988         memset( op->o_controls, 0, sizeof(opbuf.ob_controls) );
 989         op->o_sync = SLAP_CONTROL_IGNORED;
 990
 991         *op->o_hdr = *so->s_op->o_hdr;
 992
 993         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx, 1);
 994         op->o_tmpmfuncs = &slap_sl_mfuncs;
 995         op->o_threadctx = ctx;
 996
 997         /* syncprov_qplay expects a fake db */
 998         be = *so->s_op->o_bd;
 999         be.be_flags |= SLAP_DBFLAG_OVERLAY;
1000         op->o_bd = &be;
1001         LDAP_SLIST_FIRST(&op->o_extra) = NULL;
1002         op->o_callback = NULL;
1003
1004         rc = syncprov_qplay( op, so );
1005
1006         /* decrement use count... */
1007         syncprov_free_syncop( so, 1 );
1008
1009         return NULL;
1010 }
1011
1012 /* Start the task to play back queued psearch responses */
1013 static void
1014 syncprov_qstart( syncops *so )
1015 {
1016         so->s_flags |= PS_TASK_QUEUED;
1017         so->s_inuse++;
1018         ldap_pvt_thread_pool_submit( &connection_pool,
1019                 syncprov_qtask, so );
1020 }
1021
1022 /* Queue a persistent search response */
1023 static int
1024 syncprov_qresp( opcookie *opc, syncops *so, int mode )
1025 {
1026         syncres *sr;
1027         resinfo *ri;
1028         int srsize;
1029         struct berval csn = opc->sctxcsn;
1030
1031         sr = ch_malloc( sizeof( syncres ));
1032         sr->s_next = NULL;
1033         sr->s_mode = mode;
1034         if ( !opc->ssres.s_info ) {
1035
1036                 srsize = sizeof( resinfo );
1037                 if ( csn.bv_len )
1038                         srsize += csn.bv_len + 1;
1039
1040                 if ( opc->se ) {
1041                         Attribute *a;
1042                         ri = ch_malloc( srsize );
1043                         ri->ri_dn = opc->se->e_name;
1044                         ri->ri_ndn = opc->se->e_nname;
1045                         a = attr_find( opc->se->e_attrs, slap_schema.si_ad_entryUUID );
1046                         if ( a )
1047                                 ri->ri_uuid = a->a_nvals[0];
1048                         else
1049                                 ri->ri_uuid.bv_len = 0;
1050                         if ( csn.bv_len ) {
1051                                 ri->ri_csn.bv_val = (char *)(ri + 1);
1052                                 ri->ri_csn.bv_len = csn.bv_len;
1053                                 memcpy( ri->ri_csn.bv_val, csn.bv_val, csn.bv_len );
1054                                 ri->ri_csn.bv_val[csn.bv_len] = '\0';
1055                         } else {
1056                                 ri->ri_csn.bv_val = NULL;
1057                         }
1058                 } else {
1059                         srsize += opc->suuid.bv_len +
1060                                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1;
1061                         ri = ch_malloc( srsize );
1062                         ri->ri_dn.bv_val = (char *)(ri + 1);
1063                         ri->ri_dn.bv_len = opc->sdn.bv_len;
1064                         ri->ri_ndn.bv_val = lutil_strcopy( ri->ri_dn.bv_val,
1065                                 opc->sdn.bv_val ) + 1;
1066                         ri->ri_ndn.bv_len = opc->sndn.bv_len;
1067                         ri->ri_uuid.bv_val = lutil_strcopy( ri->ri_ndn.bv_val,
1068                                 opc->sndn.bv_val ) + 1;
1069                         ri->ri_uuid.bv_len = opc->suuid.bv_len;
1070                         AC_MEMCPY( ri->ri_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1071                         if ( csn.bv_len ) {
1072                                 ri->ri_csn.bv_val = ri->ri_uuid.bv_val + ri->ri_uuid.bv_len;
1073                                 memcpy( ri->ri_csn.bv_val, csn.bv_val, csn.bv_len );
1074                                 ri->ri_csn.bv_val[csn.bv_len] = '\0';
1075                         } else {
1076                                 ri->ri_csn.bv_val = NULL;
1077                         }
1078                 }
1079                 ri->ri_list = &opc->ssres;
1080                 ri->ri_e = opc->se;
1081                 ri->ri_csn.bv_len = csn.bv_len;
1082                 ri->ri_isref = opc->sreference;
1083                 BER_BVZERO( &ri->ri_cookie );
1084                 ldap_pvt_thread_mutex_init( &ri->ri_mutex );
1085                 opc->se = NULL;
1086                 opc->ssres.s_info = ri;
1087         }
1088         ri = opc->ssres.s_info;
1089         sr->s_info = ri;
1090         ldap_pvt_thread_mutex_lock( &ri->ri_mutex );
1091         sr->s_rilist = ri->ri_list;
1092         ri->ri_list = sr;
1093         if ( mode == LDAP_SYNC_NEW_COOKIE && BER_BVISNULL( &ri->ri_cookie )) {
1094                 syncprov_info_t *si = opc->son->on_bi.bi_private;
1095
1096                 slap_compose_sync_cookie( NULL, &ri->ri_cookie, si->si_ctxcsn,
1097                         so->s_rid, slap_serverID ? slap_serverID : -1);
1098         }
1099         ldap_pvt_thread_mutex_unlock( &ri->ri_mutex );
1100
1101         ldap_pvt_thread_mutex_lock( &so->s_mutex );
1102         if ( !so->s_res ) {
1103                 so->s_res = sr;
1104         } else {
1105                 so->s_restail->s_next = sr;
1106         }
1107         so->s_restail = sr;
1108
1109         /* If the base of the psearch was modified, check it next time round */
1110         if ( so->s_flags & PS_WROTE_BASE ) {
1111                 so->s_flags ^= PS_WROTE_BASE;
1112                 so->s_flags |= PS_FIND_BASE;
1113         }
1114         if (( so->s_flags & (PS_IS_DETACHED|PS_TASK_QUEUED)) == PS_IS_DETACHED ) {
1115                 syncprov_qstart( so );
1116         }
1117         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
1118         return LDAP_SUCCESS;
1119 }
1120
1121 static int
1122 syncprov_drop_psearch( syncops *so, int lock )
1123 {
1124         if ( so->s_flags & PS_IS_DETACHED ) {
1125                 if ( lock )
1126                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
1127                 so->s_op->o_conn->c_n_ops_executing--;
1128                 so->s_op->o_conn->c_n_ops_completed++;
1129                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, Operation,
1130                         o_next );
1131                 if ( lock )
1132                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
1133         }
1134         return syncprov_free_syncop( so, 0 );
1135 }
1136
1137 static int
1138 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
1139 {
1140         slap_callback *sc = op->o_callback;
1141         op->o_callback = sc->sc_next;
1142         syncprov_drop_psearch( sc->sc_private, 0 );
1143         op->o_tmpfree( sc, op->o_tmpmemctx );
1144         return 0;
1145 }
1146
1147 static int
1148 syncprov_op_abandon( Operation *op, SlapReply *rs )
1149 {
1150         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1151         syncprov_info_t         *si = on->on_bi.bi_private;
1152         syncops *so, **sop;
1153
1154         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1155         for ( sop=&si->si_ops; (so = *sop); sop = &(*sop)->s_next ) {
1156                 if ( so->s_op->o_connid == op->o_connid &&
1157                         so->s_op->o_msgid == op->orn_msgid ) {
1158                                 so->s_op->o_abandon = 1;
1159                                 *sop = so->s_next;
1160                                 break;
1161                 }
1162         }
1163         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1164         if ( so ) {
1165                 /* Is this really a Cancel exop? */
1166                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
1167                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
1168                         rs->sr_err = LDAP_CANCELLED;
1169                         send_ldap_result( so->s_op, rs );
1170                         if ( so->s_flags & PS_IS_DETACHED ) {
1171                                 slap_callback *cb;
1172                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
1173                                 cb->sc_cleanup = syncprov_ab_cleanup;
1174                                 cb->sc_next = op->o_callback;
1175                                 cb->sc_private = so;
1176                                 op->o_callback = cb;
1177                                 return SLAP_CB_CONTINUE;
1178                         }
1179                 }
1180                 syncprov_drop_psearch( so, 0 );
1181         }
1182         return SLAP_CB_CONTINUE;
1183 }
1184
1185 /* Find which persistent searches are affected by this operation */
1186 static void
1187 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
1188 {
1189         slap_overinst *on = opc->son;
1190         syncprov_info_t         *si = on->on_bi.bi_private;
1191
1192         fbase_cookie fc;
1193         syncops **pss;
1194         Entry *e = NULL;
1195         Attribute *a;
1196         int rc, gonext;
1197         struct berval newdn;
1198         int freefdn = 0;
1199         BackendDB *b0 = op->o_bd, db;
1200
1201         fc.fdn = &op->o_req_ndn;
1202         /* compute new DN */
1203         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1204                 struct berval pdn;
1205                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
1206                 else dnParent( fc.fdn, &pdn );
1207                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
1208                 fc.fdn = &newdn;
1209                 freefdn = 1;
1210         }
1211         if ( op->o_tag != LDAP_REQ_ADD ) {
1212                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1213                         db = *op->o_bd;
1214                         op->o_bd = &db;
1215                 }
1216                 rc = overlay_entry_get_ov( op, fc.fdn, NULL, NULL, 0, &e, on );
1217                 /* If we're sending responses now, make a copy and unlock the DB */
1218                 if ( e && !saveit ) {
1219                         if ( !opc->se )
1220                                 opc->se = entry_dup( e );
1221                         overlay_entry_release_ov( op, e, 0, on );
1222                         e = opc->se;
1223                 }
1224                 if ( rc ) {
1225                         op->o_bd = b0;
1226                         return;
1227                 }
1228         } else {
1229                 e = op->ora_e;
1230                 if ( !saveit ) {
1231                         if ( !opc->se )
1232                                 opc->se = entry_dup( e );
1233                         e = opc->se;
1234                 }
1235         }
1236
1237         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1238                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1239                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1240                 opc->sreference = is_entry_referral( e );
1241                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1242                 if ( a )
1243                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1244         } else if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1245                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1246                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1247                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1248                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1249         }
1250
1251         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1252         for (pss = &si->si_ops; *pss; pss = gonext ? &(*pss)->s_next : pss)
1253         {
1254                 Operation op2;
1255                 Opheader oh;
1256                 syncmatches *sm;
1257                 int found = 0;
1258                 syncops *snext, *ss = *pss;
1259
1260                 gonext = 1;
1261                 if ( ss->s_op->o_abandon )
1262                         continue;
1263
1264                 /* Don't send ops back to the originator */
1265                 if ( opc->osid > 0 && opc->osid == ss->s_sid ) {
1266                         Debug( LDAP_DEBUG_SYNC, "syncprov_matchops: skipping original sid %03x\n",
1267                                 opc->osid, 0, 0 );
1268                         continue;
1269                 }
1270
1271                 /* Don't send ops back to the messenger */
1272                 if ( opc->rsid > 0 && opc->rsid == ss->s_sid ) {
1273                         Debug( LDAP_DEBUG_SYNC, "syncprov_matchops: skipping relayed sid %03x\n",
1274                                 opc->rsid, 0, 0 );
1275                         continue;
1276                 }
1277
1278                 /* validate base */
1279                 fc.fss = ss;
1280                 fc.fbase = 0;
1281                 fc.fscope = 0;
1282
1283                 /* If the base of the search is missing, signal a refresh */
1284                 rc = syncprov_findbase( op, &fc );
1285                 if ( rc != LDAP_SUCCESS ) {
1286                         SlapReply rs = {REP_RESULT};
1287                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1288                                 "search base has changed" );
1289                         snext = ss->s_next;
1290                         if ( syncprov_drop_psearch( ss, 1 ) )
1291                                 *pss = snext;
1292                         gonext = 0;
1293                         continue;
1294                 }
1295
1296                 /* If we're sending results now, look for this op in old matches */
1297                 if ( !saveit ) {
1298                         syncmatches *old;
1299
1300                         /* Did we modify the search base? */
1301                         if ( dn_match( &op->o_req_ndn, &ss->s_base )) {
1302                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1303                                 ss->s_flags |= PS_WROTE_BASE;
1304                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1305                         }
1306
1307                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1308                                 old=sm, sm=sm->sm_next ) {
1309                                 if ( sm->sm_op == ss ) {
1310                                         found = 1;
1311                                         old->sm_next = sm->sm_next;
1312                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1313                                         break;
1314                                 }
1315                         }
1316                 }
1317
1318                 if ( fc.fscope ) {
1319                         ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1320                         op2 = *ss->s_op;
1321                         oh = *op->o_hdr;
1322                         oh.oh_conn = ss->s_op->o_conn;
1323                         oh.oh_connid = ss->s_op->o_connid;
1324                         op2.o_bd = op->o_bd->bd_self;
1325                         op2.o_hdr = &oh;
1326                         op2.o_extra = op->o_extra;
1327                         op2.o_callback = NULL;
1328                         if (ss->s_flags & PS_FIX_FILTER) {
1329                                 /* Skip the AND/GE clause that we stuck on in front. We
1330                                    would lose deletes/mods that happen during the refresh
1331                                    phase otherwise (ITS#6555) */
1332                                 op2.ors_filter = ss->s_op->ors_filter->f_and->f_next;
1333                         }
1334                         rc = test_filter( &op2, e, op2.ors_filter );
1335                         ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1336                 }
1337
1338                 Debug( LDAP_DEBUG_TRACE, "syncprov_matchops: sid %03x fscope %d rc %d\n",
1339                         ss->s_sid, fc.fscope, rc );
1340
1341                 /* check if current o_req_dn is in scope and matches filter */
1342                 if ( fc.fscope && rc == LDAP_COMPARE_TRUE ) {
1343                         if ( saveit ) {
1344                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1345                                 sm->sm_next = opc->smatches;
1346                                 sm->sm_op = ss;
1347                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1348                                 ++ss->s_inuse;
1349                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1350                                 opc->smatches = sm;
1351                         } else {
1352                                 /* if found send UPDATE else send ADD */
1353                                 syncprov_qresp( opc, ss,
1354                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD );
1355                         }
1356                 } else if ( !saveit && found ) {
1357                         /* send DELETE */
1358                         syncprov_qresp( opc, ss, LDAP_SYNC_DELETE );
1359                 } else if ( !saveit ) {
1360                         syncprov_qresp( opc, ss, LDAP_SYNC_NEW_COOKIE );
1361                 }
1362                 if ( !saveit && found ) {
1363                         /* Decrement s_inuse, was incremented when called
1364                          * with saveit == TRUE
1365                          */
1366                         snext = ss->s_next;
1367                         if ( syncprov_free_syncop( ss, 0 ) ) {
1368                                 *pss = snext;
1369                                 gonext = 0;
1370                         }
1371                 }
1372         }
1373         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1374
1375         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1376                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1377                         op->o_bd = &db;
1378                 }
1379                 if ( saveit )
1380                         overlay_entry_release_ov( op, e, 0, on );
1381                 op->o_bd = b0;
1382         }
1383         if ( !saveit ) {
1384                 if ( opc->ssres.s_info )
1385                         free_resinfo( &opc->ssres );
1386                 else if ( opc->se )
1387                         entry_free( opc->se );
1388         }
1389         if ( freefdn ) {
1390                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1391         }
1392         op->o_bd = b0;
1393 }
1394
1395 static int
1396 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1397 {
1398         slap_callback *cb = op->o_callback;
1399         opcookie *opc = cb->sc_private;
1400         slap_overinst *on = opc->son;
1401         syncprov_info_t         *si = on->on_bi.bi_private;
1402         syncmatches *sm, *snext;
1403         modtarget *mt;
1404
1405         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1406         if ( si->si_active )
1407                 si->si_active--;
1408         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1409
1410         for (sm = opc->smatches; sm; sm=snext) {
1411                 snext = sm->sm_next;
1412                 syncprov_free_syncop( sm->sm_op, 1 );
1413                 op->o_tmpfree( sm, op->o_tmpmemctx );
1414         }
1415
1416         /* Remove op from lock table */
1417         mt = opc->smt;
1418         if ( mt ) {
1419                 modinst *mi = (modinst *)(opc+1), **m2;
1420                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1421                 for (m2 = &mt->mt_mods; ; m2 = &(*m2)->mi_next) {
1422                         if ( *m2 == mi ) {
1423                                 *m2 = mi->mi_next;
1424                                 if ( mt->mt_tail == mi )
1425                                         mt->mt_tail = ( m2 == &mt->mt_mods ) ? NULL : (modinst *)m2;
1426                                 break;
1427                         }
1428                 }
1429                 /* If there are more, promote the next one */
1430                 if ( mt->mt_mods ) {
1431                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1432                 } else {
1433                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1434                         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1435                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1436                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1437                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1438                         ch_free( mt->mt_dn.bv_val );
1439                         ch_free( mt );
1440                 }
1441         }
1442         if ( !BER_BVISNULL( &opc->suuid ))
1443                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1444         if ( !BER_BVISNULL( &opc->sndn ))
1445                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1446         if ( !BER_BVISNULL( &opc->sdn ))
1447                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1448         op->o_callback = cb->sc_next;
1449         op->o_tmpfree(cb, op->o_tmpmemctx);
1450
1451         return 0;
1452 }
1453
1454 static void
1455 syncprov_checkpoint( Operation *op, slap_overinst *on )
1456 {
1457         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
1458         Modifications mod;
1459         Operation opm;
1460         SlapReply rsm = {REP_RESULT};
1461         slap_callback cb = {0};
1462         BackendDB be;
1463         BackendInfo *bi;
1464
1465 #ifdef CHECK_CSN
1466         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1467
1468         int i;
1469         for ( i=0; i<si->si_numcsns; i++ ) {
1470                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1471         }
1472 #endif
1473         mod.sml_numvals = si->si_numcsns;
1474         mod.sml_values = si->si_ctxcsn;
1475         mod.sml_nvalues = NULL;
1476         mod.sml_desc = slap_schema.si_ad_contextCSN;
1477         mod.sml_op = LDAP_MOD_REPLACE;
1478         mod.sml_flags = SLAP_MOD_INTERNAL;
1479         mod.sml_next = NULL;
1480
1481         cb.sc_response = slap_null_cb;
1482         opm = *op;
1483         opm.o_tag = LDAP_REQ_MODIFY;
1484         opm.o_callback = &cb;
1485         opm.orm_modlist = &mod;
1486         opm.orm_no_opattrs = 1;
1487         if ( SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1488                 be = *on->on_info->oi_origdb;
1489                 opm.o_bd = &be;
1490         }
1491         opm.o_req_dn = si->si_contextdn;
1492         opm.o_req_ndn = si->si_contextdn;
1493         bi = opm.o_bd->bd_info;
1494         opm.o_bd->bd_info = on->on_info->oi_orig;
1495         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1496         opm.o_no_schema_check = 1;
1497         opm.o_dont_replicate = 1;
1498         opm.o_opid = -1;
1499         opm.o_bd->be_modify( &opm, &rsm );
1500
1501         if ( rsm.sr_err == LDAP_NO_SUCH_OBJECT &&
1502                 SLAP_SYNC_SUBENTRY( opm.o_bd )) {
1503                 const char      *text;
1504                 char txtbuf[SLAP_TEXT_BUFLEN];
1505                 size_t textlen = sizeof txtbuf;
1506                 Entry *e = slap_create_context_csn_entry( opm.o_bd, NULL );
1507                 rs_reinit( &rsm, REP_RESULT );
1508                 slap_mods2entry( &mod, &e, 0, 1, &text, txtbuf, textlen);
1509                 opm.ora_e = e;
1510                 opm.o_bd->be_add( &opm, &rsm );
1511                 if ( e == opm.ora_e )
1512                         be_entry_release_w( &opm, opm.ora_e );
1513         }
1514         opm.o_bd->bd_info = bi;
1515
1516         if ( mod.sml_next != NULL ) {
1517                 slap_mods_free( mod.sml_next, 1 );
1518         }
1519 #ifdef CHECK_CSN
1520         for ( i=0; i<si->si_numcsns; i++ ) {
1521                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1522         }
1523 #endif
1524 }
1525
1526 static void
1527 syncprov_add_slog( Operation *op )
1528 {
1529         opcookie *opc = op->o_callback->sc_private;
1530         slap_overinst *on = opc->son;
1531         syncprov_info_t         *si = on->on_bi.bi_private;
1532         sessionlog *sl;
1533         slog_entry *se;
1534
1535         sl = si->si_logs;
1536         {
1537                 if ( BER_BVISEMPTY( &op->o_csn ) ) {
1538                         /* During the syncrepl refresh phase we can receive operations
1539                          * without a csn.  We cannot reliably determine the consumers
1540                          * state with respect to such operations, so we ignore them and
1541                          * wipe out anything in the log if we see them.
1542                          */
1543                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1544                         /* can only do this if no one else is reading the log at the moment */
1545                         if (!sl->sl_playing) {
1546                         while ( se = sl->sl_head ) {
1547                                 sl->sl_head = se->se_next;
1548                                 ch_free( se );
1549                         }
1550                         sl->sl_tail = NULL;
1551                         sl->sl_num = 0;
1552                         }
1553                         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1554                         return;
1555                 }
1556
1557                 /* Allocate a record. UUIDs are not NUL-terminated. */
1558                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1559                         op->o_csn.bv_len + 1 );
1560                 se->se_next = NULL;
1561                 se->se_tag = op->o_tag;
1562
1563                 se->se_uuid.bv_val = (char *)(&se[1]);
1564                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1565                 se->se_uuid.bv_len = opc->suuid.bv_len;
1566
1567                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1568                 AC_MEMCPY( se->se_csn.bv_val, op->o_csn.bv_val, op->o_csn.bv_len );
1569                 se->se_csn.bv_val[op->o_csn.bv_len] = '\0';
1570                 se->se_csn.bv_len = op->o_csn.bv_len;
1571                 se->se_sid = slap_parse_csn_sid( &se->se_csn );
1572
1573                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1574                 if ( sl->sl_head ) {
1575                         /* Keep the list in csn order. */
1576                         if ( ber_bvcmp( &sl->sl_tail->se_csn, &se->se_csn ) <= 0 ) {
1577                                 sl->sl_tail->se_next = se;
1578                                 sl->sl_tail = se;
1579                         } else {
1580                                 slog_entry **sep;
1581
1582                                 for ( sep = &sl->sl_head; *sep; sep = &(*sep)->se_next ) {
1583                                         if ( ber_bvcmp( &se->se_csn, &(*sep)->se_csn ) < 0 ) {
1584                                                 se->se_next = *sep;
1585                                                 *sep = se;
1586                                                 break;
1587                                         }
1588                                 }
1589                         }
1590                 } else {
1591                         sl->sl_head = se;
1592                         sl->sl_tail = se;
1593                         if ( !sl->sl_mincsn ) {
1594                                 sl->sl_numcsns = 1;
1595                                 sl->sl_mincsn = ch_malloc( 2*sizeof( struct berval ));
1596                                 sl->sl_sids = ch_malloc( sizeof( int ));
1597                                 sl->sl_sids[0] = se->se_sid;
1598                                 ber_dupbv( sl->sl_mincsn, &se->se_csn );
1599                                 BER_BVZERO( &sl->sl_mincsn[1] );
1600                         }
1601                 }
1602                 sl->sl_num++;
1603                 if (!sl->sl_playing) {
1604                 while ( sl->sl_num > sl->sl_size ) {
1605                         int i;
1606                         se = sl->sl_head;
1607                         sl->sl_head = se->se_next;
1608                         for ( i=0; i<sl->sl_numcsns; i++ )
1609                                 if ( sl->sl_sids[i] >= se->se_sid )
1610                                         break;
1611                         if  ( i == sl->sl_numcsns || sl->sl_sids[i] != se->se_sid ) {
1612                                 slap_insert_csn_sids( (struct sync_cookie *)sl,
1613                                         i, se->se_sid, &se->se_csn );
1614                         } else {
1615                                 ber_bvreplace( &sl->sl_mincsn[i], &se->se_csn );
1616                         }
1617                         ch_free( se );
1618                         sl->sl_num--;
1619                 }
1620                 }
1621                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1622         }
1623 }
1624
1625 /* Just set a flag if we found the matching entry */
1626 static int
1627 playlog_cb( Operation *op, SlapReply *rs )
1628 {
1629         if ( rs->sr_type == REP_SEARCH ) {
1630                 op->o_callback->sc_private = (void *)1;
1631         }
1632         return rs->sr_err;
1633 }
1634
1635 /* enter with sl->sl_mutex locked, release before returning */
1636 static void
1637 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1638         sync_control *srs, BerVarray ctxcsn, int numcsns, int *sids )
1639 {
1640         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1641         slog_entry *se;
1642         int i, j, ndel, num, nmods, mmods;
1643         char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
1644         BerVarray uuids;
1645         struct berval delcsn[2];
1646
1647         if ( !sl->sl_num ) {
1648                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1649                 return;
1650         }
1651
1652         num = sl->sl_num;
1653         i = 0;
1654         nmods = 0;
1655         sl->sl_playing++;
1656         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1657
1658         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1659                 num * UUID_LEN, op->o_tmpmemctx );
1660         uuids[0].bv_val = (char *)(uuids + num + 1);
1661
1662         delcsn[0].bv_len = 0;
1663         delcsn[0].bv_val = cbuf;
1664         BER_BVZERO(&delcsn[1]);
1665
1666         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1667          * and everything else at the end. Do this first so we can
1668          * unlock the list mutex.
1669          */
1670         Debug( LDAP_DEBUG_SYNC, "srs csn %s\n",
1671                 srs->sr_state.ctxcsn[0].bv_val, 0, 0 );
1672         for ( se=sl->sl_head; se; se=se->se_next ) {
1673                 int k;
1674                 Debug( LDAP_DEBUG_SYNC, "log csn %s\n", se->se_csn.bv_val, 0, 0 );
1675                 ndel = 1;
1676                 for ( k=0; k<srs->sr_state.numcsns; k++ ) {
1677                         if ( se->se_sid == srs->sr_state.sids[k] ) {
1678                                 ndel = ber_bvcmp( &se->se_csn, &srs->sr_state.ctxcsn[k] );
1679                                 break;
1680                         }
1681                 }
1682                 if ( ndel <= 0 ) {
1683                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too old\n", ndel, 0, 0 );
1684                         continue;
1685                 }
1686                 ndel = 0;
1687                 for ( k=0; k<numcsns; k++ ) {
1688                         if ( se->se_sid == sids[k] ) {
1689                                 ndel = ber_bvcmp( &se->se_csn, &ctxcsn[k] );
1690                                 break;
1691                         }
1692                 }
1693                 if ( ndel > 0 ) {
1694                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too new\n", ndel, 0, 0 );
1695                         break;
1696                 }
1697                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1698                         j = i;
1699                         i++;
1700                         AC_MEMCPY( cbuf, se->se_csn.bv_val, se->se_csn.bv_len );
1701                         delcsn[0].bv_len = se->se_csn.bv_len;
1702                         delcsn[0].bv_val[delcsn[0].bv_len] = '\0';
1703                 } else {
1704                         if ( se->se_tag == LDAP_REQ_ADD )
1705                                 continue;
1706                         nmods++;
1707                         j = num - nmods;
1708                 }
1709                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1710                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1711                 uuids[j].bv_len = UUID_LEN;
1712         }
1713         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1714         sl->sl_playing--;
1715         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1716
1717         ndel = i;
1718
1719         /* Zero out unused slots */
1720         for ( i=ndel; i < num - nmods; i++ )
1721                 uuids[i].bv_len = 0;
1722
1723         /* Mods must be validated to see if they belong in this delete set.
1724          */
1725
1726         mmods = nmods;
1727         /* Strip any duplicates */
1728         for ( i=0; i<nmods; i++ ) {
1729                 for ( j=0; j<ndel; j++ ) {
1730                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1731                                 uuids[num - 1 - i].bv_len = 0;
1732                                 mmods --;
1733                                 break;
1734                         }
1735                 }
1736                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1737                 for ( j=0; j<i; j++ ) {
1738                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1739                                 uuids[num - 1 - i].bv_len = 0;
1740                                 mmods --;
1741                                 break;
1742                         }
1743                 }
1744         }
1745
1746         if ( mmods ) {
1747                 Operation fop;
1748                 int rc;
1749                 Filter mf, af;
1750                 AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
1751                 slap_callback cb = {0};
1752
1753                 fop = *op;
1754
1755                 fop.o_sync_mode = 0;
1756                 fop.o_callback = &cb;
1757                 fop.ors_limit = NULL;
1758                 fop.ors_tlimit = SLAP_NO_LIMIT;
1759                 fop.ors_attrs = slap_anlist_all_attributes;
1760                 fop.ors_attrsonly = 0;
1761                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1762
1763                 af.f_choice = LDAP_FILTER_AND;
1764                 af.f_next = NULL;
1765                 af.f_and = &mf;
1766                 mf.f_choice = LDAP_FILTER_EQUALITY;
1767                 mf.f_ava = &eq;
1768                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1769                 mf.f_next = fop.ors_filter;
1770
1771                 fop.ors_filter = &af;
1772
1773                 cb.sc_response = playlog_cb;
1774                 fop.o_bd->bd_info = (BackendInfo *)on->on_info;
1775
1776                 for ( i=ndel; i<num; i++ ) {
1777                   if ( uuids[i].bv_len != 0 ) {
1778                         SlapReply frs = { REP_RESULT };
1779
1780                         mf.f_av_value = uuids[i];
1781                         cb.sc_private = NULL;
1782                         fop.ors_slimit = 1;
1783                         rc = fop.o_bd->be_search( &fop, &frs );
1784
1785                         /* If entry was not found, add to delete list */
1786                         if ( !cb.sc_private ) {
1787                                 uuids[ndel++] = uuids[i];
1788                         }
1789                   }
1790                 }
1791                 fop.o_bd->bd_info = (BackendInfo *)on;
1792         }
1793         if ( ndel ) {
1794                 struct berval cookie;
1795
1796                 if ( delcsn[0].bv_len ) {
1797                         slap_compose_sync_cookie( op, &cookie, delcsn, srs->sr_state.rid,
1798                                 slap_serverID ? slap_serverID : -1 );
1799
1800                         Debug( LDAP_DEBUG_SYNC, "syncprov_playlog: cookie=%s\n", cookie.bv_val, 0, 0 );
1801                 }
1802
1803                 uuids[ndel].bv_val = NULL;
1804                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET,
1805                         delcsn[0].bv_len ? &cookie : NULL, 0, uuids, 1 );
1806                 if ( delcsn[0].bv_len ) {
1807                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1808                 }
1809         }
1810         op->o_tmpfree( uuids, op->o_tmpmemctx );
1811 }
1812
1813 static int
1814 syncprov_new_ctxcsn( opcookie *opc, syncprov_info_t *si, int csn_changed, int numvals, BerVarray vals )
1815 {
1816         unsigned i;
1817         int j, sid;
1818
1819         for ( i=0; i<numvals; i++ ) {
1820                 sid = slap_parse_csn_sid( &vals[i] );
1821                 for ( j=0; j<si->si_numcsns; j++ ) {
1822                         if ( sid < si->si_sids[j] )
1823                                 break;
1824                         if ( sid == si->si_sids[j] ) {
1825                                 if ( ber_bvcmp( &vals[i], &si->si_ctxcsn[j] ) > 0 ) {
1826                                         ber_bvreplace( &si->si_ctxcsn[j], &vals[i] );
1827                                         csn_changed = 1;
1828                                 }
1829                                 break;
1830                         }
1831                 }
1832
1833                 if ( j == si->si_numcsns || sid != si->si_sids[j] ) {
1834                         slap_insert_csn_sids( (struct sync_cookie *)&si->si_ctxcsn,
1835                                 j, sid, &vals[i] );
1836                         csn_changed = 1;
1837                 }
1838         }
1839         if ( csn_changed )
1840                 si->si_dirty = 0;
1841         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1842
1843         if ( csn_changed ) {
1844                 syncops *ss;
1845                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1846                 for ( ss = si->si_ops; ss; ss = ss->s_next ) {
1847                         if ( ss->s_op->o_abandon )
1848                                 continue;
1849                         /* Send the updated csn to all syncrepl consumers,
1850                          * including the server from which it originated.
1851                          * The syncrepl consumer and syncprov provider on
1852                          * the originating server may be configured to store
1853                          * their csn values in different entries.
1854                          */
1855                         syncprov_qresp( opc, ss, LDAP_SYNC_NEW_COOKIE );
1856                 }
1857                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1858         }
1859         return csn_changed;
1860 }
1861
1862 static int
1863 syncprov_op_response( Operation *op, SlapReply *rs )
1864 {
1865         opcookie *opc = op->o_callback->sc_private;
1866         slap_overinst *on = opc->son;
1867         syncprov_info_t         *si = on->on_bi.bi_private;
1868         syncmatches *sm;
1869
1870         if ( rs->sr_err == LDAP_SUCCESS )
1871         {
1872                 struct berval maxcsn;
1873                 char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
1874                 int do_check = 0, have_psearches, foundit, csn_changed = 0;
1875
1876                 ldap_pvt_thread_mutex_lock( &si->si_resp_mutex );
1877
1878                 /* Update our context CSN */
1879                 cbuf[0] = '\0';
1880                 maxcsn.bv_val = cbuf;
1881                 maxcsn.bv_len = sizeof(cbuf);
1882                 ldap_pvt_thread_rdwr_wlock( &si->si_csn_rwlock );
1883
1884                 slap_get_commit_csn( op, &maxcsn, &foundit );
1885                 if ( BER_BVISEMPTY( &maxcsn ) && SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1886                         /* syncrepl queues the CSN values in the db where
1887                          * it is configured , not where the changes are made.
1888                          * So look for a value in the glue db if we didn't
1889                          * find any in this db.
1890                          */
1891                         BackendDB *be = op->o_bd;
1892                         op->o_bd = select_backend( &be->be_nsuffix[0], 1);
1893                         maxcsn.bv_val = cbuf;
1894                         maxcsn.bv_len = sizeof(cbuf);
1895                         slap_get_commit_csn( op, &maxcsn, &foundit );
1896                         op->o_bd = be;
1897                 }
1898                 if ( !BER_BVISEMPTY( &maxcsn ) ) {
1899                         int i, sid;
1900 #ifdef CHECK_CSN
1901                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1902                         assert( !syn->ssyn_validate( syn, &maxcsn ));
1903 #endif
1904                         sid = slap_parse_csn_sid( &maxcsn );
1905                         for ( i=0; i<si->si_numcsns; i++ ) {
1906                                 if ( sid < si->si_sids[i] )
1907                                         break;
1908                                 if ( sid == si->si_sids[i] ) {
1909                                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn[i] ) > 0 ) {
1910                                                 ber_bvreplace( &si->si_ctxcsn[i], &maxcsn );
1911                                                 csn_changed = 1;
1912                                         }
1913                                         break;
1914                                 }
1915                         }
1916                         /* It's a new SID for us */
1917                         if ( i == si->si_numcsns || sid != si->si_sids[i] ) {
1918                                 slap_insert_csn_sids((struct sync_cookie *)&(si->si_ctxcsn),
1919                                         i, sid, &maxcsn );
1920                                 csn_changed = 1;
1921                         }
1922                 }
1923
1924                 /* Don't do any processing for consumer contextCSN updates */
1925                 if ( SLAPD_SYNC_IS_SYNCCONN( op->o_connid ) &&
1926                         op->o_tag == LDAP_REQ_MODIFY &&
1927                         op->orm_modlist &&
1928                         op->orm_modlist->sml_op == LDAP_MOD_REPLACE &&
1929                         op->orm_modlist->sml_desc == slap_schema.si_ad_contextCSN ) {
1930                         /* Catch contextCSN updates from syncrepl. We have to look at
1931                          * all the attribute values, as there may be more than one csn
1932                          * that changed, and only one can be passed in the csn queue.
1933                          */
1934                         csn_changed = syncprov_new_ctxcsn( opc, si, csn_changed,
1935                                 op->orm_modlist->sml_numvals, op->orm_modlist->sml_values );
1936                         if ( csn_changed )
1937                                 si->si_numops++;
1938                         goto leave;
1939                 }
1940                 if ( op->o_dont_replicate ) {
1941                         if ( csn_changed )
1942                                 si->si_numops++;
1943                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1944                         goto leave;
1945                 }
1946
1947                 /* If we're adding the context entry, parse all of its contextCSNs */
1948                 if ( op->o_tag == LDAP_REQ_ADD &&
1949                         dn_match( &op->o_req_ndn, &si->si_contextdn )) {
1950                         Attribute *a = attr_find( op->ora_e->e_attrs, slap_schema.si_ad_contextCSN );
1951                         if ( a ) {
1952                                 csn_changed = syncprov_new_ctxcsn( opc, si, csn_changed, a->a_numvals, a->a_vals );
1953                                 if ( csn_changed )
1954                                         si->si_numops++;
1955                                 goto added;
1956                         }
1957                 }
1958
1959                 if ( csn_changed )
1960                         si->si_numops++;
1961                 if ( si->si_chkops || si->si_chktime ) {
1962                         /* Never checkpoint adding the context entry,
1963                          * it will deadlock
1964                          */
1965                         if ( op->o_tag != LDAP_REQ_ADD ||
1966                                 !dn_match( &op->o_req_ndn, &si->si_contextdn )) {
1967                                 if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1968                                         do_check = 1;
1969                                         si->si_numops = 0;
1970                                 }
1971                                 if ( si->si_chktime &&
1972                                         (op->o_time - si->si_chklast >= si->si_chktime )) {
1973                                         if ( si->si_chklast ) {
1974                                                 do_check = 1;
1975                                                 si->si_chklast = op->o_time;
1976                                         } else {
1977                                                 si->si_chklast = 1;
1978                                         }
1979                                 }
1980                         }
1981                 }
1982                 si->si_dirty = !csn_changed;
1983                 ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1984
1985 added:
1986                 if ( do_check ) {
1987                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1988                         syncprov_checkpoint( op, on );
1989                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1990                 }
1991
1992                 /* only update consumer ctx if this is a newer csn */
1993                 if ( csn_changed ) {
1994                         opc->sctxcsn = maxcsn;
1995                 }
1996
1997                 /* Handle any persistent searches */
1998                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1999                 have_psearches = ( si->si_ops != NULL );
2000                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2001                 if ( have_psearches ) {
2002                         switch(op->o_tag) {
2003                         case LDAP_REQ_ADD:
2004                         case LDAP_REQ_MODIFY:
2005                         case LDAP_REQ_MODRDN:
2006                         case LDAP_REQ_EXTENDED:
2007                                 syncprov_matchops( op, opc, 0 );
2008                                 break;
2009                         case LDAP_REQ_DELETE:
2010                                 /* for each match in opc->smatches:
2011                                  *   send DELETE msg
2012                                  */
2013                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
2014                                         if ( sm->sm_op->s_op->o_abandon )
2015                                                 continue;
2016                                         syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_DELETE );
2017                                 }
2018                                 if ( opc->ssres.s_info )
2019                                         free_resinfo( &opc->ssres );
2020                                 break;
2021                         }
2022                 }
2023
2024                 /* Add any log records */
2025                 if ( si->si_logs ) {
2026                         syncprov_add_slog( op );
2027                 }
2028 leave:          ldap_pvt_thread_mutex_unlock( &si->si_resp_mutex );
2029         }
2030         return SLAP_CB_CONTINUE;
2031 }
2032
2033 /* We don't use a subentry to store the context CSN any more.
2034  * We expose the current context CSN as an operational attribute
2035  * of the suffix entry.
2036  */
2037 static int
2038 syncprov_op_compare( Operation *op, SlapReply *rs )
2039 {
2040         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2041         syncprov_info_t         *si = on->on_bi.bi_private;
2042         int rc = SLAP_CB_CONTINUE;
2043
2044         if ( dn_match( &op->o_req_ndn, &si->si_contextdn ) &&
2045                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
2046         {
2047                 Entry e = {0};
2048                 Attribute a = {0};
2049
2050                 e.e_name = si->si_contextdn;
2051                 e.e_nname = si->si_contextdn;
2052                 e.e_attrs = &a;
2053
2054                 a.a_desc = slap_schema.si_ad_contextCSN;
2055
2056                 ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2057
2058                 a.a_vals = si->si_ctxcsn;
2059                 a.a_nvals = a.a_vals;
2060                 a.a_numvals = si->si_numcsns;
2061
2062                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
2063                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
2064                 if ( ! rs->sr_err ) {
2065                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
2066                         goto return_results;
2067                 }
2068
2069                 if ( get_assert( op ) &&
2070                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
2071                 {
2072                         rs->sr_err = LDAP_ASSERTION_FAILED;
2073                         goto return_results;
2074                 }
2075
2076
2077                 rs->sr_err = LDAP_COMPARE_FALSE;
2078
2079                 if ( attr_valfind( &a,
2080                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
2081                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
2082                                 &op->oq_compare.rs_ava->aa_value, NULL, op->o_tmpmemctx ) == 0 )
2083                 {
2084                         rs->sr_err = LDAP_COMPARE_TRUE;
2085                 }
2086
2087 return_results:;
2088
2089                 ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2090
2091                 send_ldap_result( op, rs );
2092
2093                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
2094                         rs->sr_err = LDAP_SUCCESS;
2095                 }
2096                 rc = rs->sr_err;
2097         }
2098
2099         return rc;
2100 }
2101
2102 static int
2103 syncprov_op_mod( Operation *op, SlapReply *rs )
2104 {
2105         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2106         syncprov_info_t         *si = on->on_bi.bi_private;
2107         slap_callback *cb;
2108         opcookie *opc;
2109         int have_psearches, cbsize;
2110
2111         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2112         have_psearches = ( si->si_ops != NULL );
2113         si->si_active++;
2114         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2115
2116         cbsize = sizeof(slap_callback) + sizeof(opcookie) +
2117                 (have_psearches ? sizeof(modinst) : 0 );
2118
2119         cb = op->o_tmpcalloc(1, cbsize, op->o_tmpmemctx);
2120         opc = (opcookie *)(cb+1);
2121         opc->son = on;
2122         cb->sc_response = syncprov_op_response;
2123         cb->sc_cleanup = syncprov_op_cleanup;
2124         cb->sc_private = opc;
2125         cb->sc_next = op->o_callback;
2126         op->o_callback = cb;
2127
2128         opc->osid = -1;
2129         opc->rsid = -1;
2130         if ( op->o_csn.bv_val ) {
2131                 opc->osid = slap_parse_csn_sid( &op->o_csn );
2132         }
2133         if ( op->o_controls ) {
2134                 struct sync_cookie *scook =
2135                 op->o_controls[slap_cids.sc_LDAPsync];
2136                 if ( scook )
2137                         opc->rsid = scook->sid;
2138         }
2139
2140         if ( op->o_dont_replicate )
2141                 return SLAP_CB_CONTINUE;
2142
2143         /* If there are active persistent searches, lock this operation.
2144          * See seqmod.c for the locking logic on its own.
2145          */
2146         if ( have_psearches ) {
2147                 modtarget *mt, mtdummy;
2148                 modinst *mi;
2149
2150                 mi = (modinst *)(opc+1);
2151                 mi->mi_op = op;
2152
2153                 /* See if we're already modifying this entry... */
2154                 mtdummy.mt_dn = op->o_req_ndn;
2155 retry:
2156                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
2157                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
2158                 if ( mt ) {
2159                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
2160                         if ( mt->mt_mods == NULL ) {
2161                                 /* Cannot reuse this mt, as another thread is about
2162                                  * to release it in syncprov_op_cleanup. Wait for them
2163                                  * to finish; our own insert is required to succeed.
2164                                  */
2165                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2166                                 ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
2167                                 ldap_pvt_thread_yield();
2168                                 goto retry;
2169                         }
2170                 }
2171                 if ( mt ) {
2172                         mt->mt_tail->mi_next = mi;
2173                         mt->mt_tail = mi;
2174                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
2175                         /* wait for this op to get to head of list */
2176                         while ( mt->mt_mods != mi ) {
2177                                 modinst *m2;
2178                                 /* don't wait on other mods from the same thread */
2179                                 for ( m2 = mt->mt_mods; m2; m2 = m2->mi_next ) {
2180                                         if ( m2->mi_op->o_threadctx == op->o_threadctx ) {
2181                                                 break;
2182                                         }
2183                                 }
2184                                 if ( m2 )
2185                                         break;
2186
2187                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2188                                 /* FIXME: if dynamic config can delete overlays or
2189                                  * databases we'll have to check for cleanup here.
2190                                  * Currently it's not an issue because there are
2191                                  * no dynamic config deletes...
2192                                  */
2193                                 if ( slapd_shutdown )
2194                                         return SLAPD_ABANDON;
2195
2196                                 if ( !ldap_pvt_thread_pool_pausecheck( &connection_pool ))
2197                                         ldap_pvt_thread_yield();
2198                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
2199
2200                                 /* clean up if the caller is giving up */
2201                                 if ( op->o_abandon ) {
2202                                         modinst **m2;
2203                                         slap_callback **sc;
2204                                         for (m2 = &mt->mt_mods; ; m2 = &(*m2)->mi_next) {
2205                                                 if ( *m2 == mi ) {
2206                                                         *m2 = mi->mi_next;
2207                                                         if ( mt->mt_tail == mi )
2208                                                                 mt->mt_tail = ( m2 == &mt->mt_mods ) ? NULL : (modinst *)m2;
2209                                                         break;
2210                                                 }
2211                                         }
2212                                         for (sc = &op->o_callback; ; sc = &(*sc)->sc_next) {
2213                                                 if ( *sc == cb ) {
2214                                                         *sc = cb->sc_next;
2215                                                         break;
2216                                                 }
2217                                         }
2218                                         op->o_tmpfree( cb, op->o_tmpmemctx );
2219                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2220                                         return SLAPD_ABANDON;
2221                                 }
2222                         }
2223                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2224                 } else {
2225                         /* Record that we're modifying this entry now */
2226                         mt = ch_malloc( sizeof(modtarget) );
2227                         mt->mt_mods = mi;
2228                         mt->mt_tail = mi;
2229                         ber_dupbv( &mt->mt_dn, &mi->mi_op->o_req_ndn );
2230                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
2231                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
2232                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
2233                 }
2234                 opc->smt = mt;
2235         }
2236
2237         if (( have_psearches || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
2238                 syncprov_matchops( op, opc, 1 );
2239
2240         return SLAP_CB_CONTINUE;
2241 }
2242
2243 static int
2244 syncprov_op_extended( Operation *op, SlapReply *rs )
2245 {
2246         if ( exop_is_write( op ))
2247                 return syncprov_op_mod( op, rs );
2248
2249         return SLAP_CB_CONTINUE;
2250 }
2251
2252 typedef struct searchstate {
2253         slap_overinst *ss_on;
2254         syncops *ss_so;
2255         BerVarray ss_ctxcsn;
2256         int *ss_sids;
2257         int ss_numcsns;
2258 #define SS_PRESENT      0x01
2259 #define SS_CHANGED      0x02
2260         int ss_flags;
2261 } searchstate;
2262
2263 typedef struct SyncOperationBuffer {
2264         Operation               sob_op;
2265         Opheader                sob_hdr;
2266         OpExtra                 sob_oe;
2267         AttributeName   sob_extra;      /* not always present */
2268         /* Further data allocated here */
2269 } SyncOperationBuffer;
2270
2271 static void
2272 syncprov_detach_op( Operation *op, syncops *so, slap_overinst *on )
2273 {
2274         SyncOperationBuffer *sopbuf2;
2275         Operation *op2;
2276         int i, alen = 0;
2277         size_t size;
2278         char *ptr;
2279         GroupAssertion *g1, *g2;
2280
2281         /* count the search attrs */
2282         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2283                 alen += op->ors_attrs[i].an_name.bv_len + 1;
2284         }
2285         /* Make a new copy of the operation */
2286         size = offsetof( SyncOperationBuffer, sob_extra ) +
2287                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
2288                 op->o_req_dn.bv_len + 1 +
2289                 op->o_req_ndn.bv_len + 1 +
2290                 op->o_ndn.bv_len + 1 +
2291                 so->s_filterstr.bv_len + 1;
2292         sopbuf2 = ch_calloc( 1, size );
2293         op2 = &sopbuf2->sob_op;
2294         op2->o_hdr = &sopbuf2->sob_hdr;
2295         LDAP_SLIST_FIRST(&op2->o_extra) = &sopbuf2->sob_oe;
2296
2297         /* Copy the fields we care about explicitly, leave the rest alone */
2298         *op2->o_hdr = *op->o_hdr;
2299         op2->o_tag = op->o_tag;
2300         op2->o_time = op->o_time;
2301         op2->o_bd = on->on_info->oi_origdb;
2302         op2->o_request = op->o_request;
2303         op2->o_managedsait = op->o_managedsait;
2304         LDAP_SLIST_FIRST(&op2->o_extra)->oe_key = on;
2305         LDAP_SLIST_NEXT(LDAP_SLIST_FIRST(&op2->o_extra), oe_next) = NULL;
2306
2307         ptr = (char *) sopbuf2 + offsetof( SyncOperationBuffer, sob_extra );
2308         if ( i ) {
2309                 op2->ors_attrs = (AttributeName *) ptr;
2310                 ptr = (char *) &op2->ors_attrs[i+1];
2311                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2312                         op2->ors_attrs[i] = op->ors_attrs[i];
2313                         op2->ors_attrs[i].an_name.bv_val = ptr;
2314                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
2315                 }
2316                 BER_BVZERO( &op2->ors_attrs[i].an_name );
2317         }
2318
2319         op2->o_authz = op->o_authz;
2320         op2->o_ndn.bv_val = ptr;
2321         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
2322         op2->o_dn = op2->o_ndn;
2323         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
2324         op2->o_req_dn.bv_val = ptr;
2325         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
2326         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
2327         op2->o_req_ndn.bv_val = ptr;
2328         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
2329         op2->ors_filterstr.bv_val = ptr;
2330         strcpy( ptr, so->s_filterstr.bv_val );
2331         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
2332
2333         /* Skip the AND/GE clause that we stuck on in front */
2334         if ( so->s_flags & PS_FIX_FILTER ) {
2335                 op2->ors_filter = op->ors_filter->f_and->f_next;
2336                 so->s_flags ^= PS_FIX_FILTER;
2337         } else {
2338                 op2->ors_filter = op->ors_filter;
2339         }
2340         op2->ors_filter = filter_dup( op2->ors_filter, NULL );
2341         so->s_op = op2;
2342
2343         /* Copy any cached group ACLs individually */
2344         op2->o_groups = NULL;
2345         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
2346                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
2347                 *g2 = *g1;
2348                 strcpy( g2->ga_ndn, g1->ga_ndn );
2349                 g2->ga_next = op2->o_groups;
2350                 op2->o_groups = g2;
2351         }
2352         /* Don't allow any further group caching */
2353         op2->o_do_not_cache = 1;
2354
2355         /* Add op2 to conn so abandon will find us */
2356         op->o_conn->c_n_ops_executing++;
2357         op->o_conn->c_n_ops_completed--;
2358         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
2359         so->s_flags |= PS_IS_DETACHED;
2360
2361         /* Prevent anyone else from trying to send a result for this op */
2362         op->o_abandon = 1;
2363 }
2364
2365 static int
2366 syncprov_search_response( Operation *op, SlapReply *rs )
2367 {
2368         searchstate *ss = op->o_callback->sc_private;
2369         slap_overinst *on = ss->ss_on;
2370         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2371         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
2372
2373         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
2374                 Attribute *a;
2375                 /* If we got a referral without a referral object, there's
2376                  * something missing that we cannot replicate. Just ignore it.
2377                  * The consumer will abort because we didn't send the expected
2378                  * control.
2379                  */
2380                 if ( !rs->sr_entry ) {
2381                         assert( rs->sr_entry != NULL );
2382                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
2383                         return SLAP_CB_CONTINUE;
2384                 }
2385                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryCSN );
2386                 if ( a == NULL && rs->sr_operational_attrs != NULL ) {
2387                         a = attr_find( rs->sr_operational_attrs, slap_schema.si_ad_entryCSN );
2388                 }
2389                 if ( a ) {
2390                         int i, sid;
2391                         sid = slap_parse_csn_sid( &a->a_nvals[0] );
2392
2393                         /* If not a persistent search */
2394                         if ( !ss->ss_so ) {
2395                                 /* Make sure entry is less than the snapshot'd contextCSN */
2396                                 for ( i=0; i<ss->ss_numcsns; i++ ) {
2397                                         if ( sid == ss->ss_sids[i] && ber_bvcmp( &a->a_nvals[0],
2398                                                 &ss->ss_ctxcsn[i] ) > 0 ) {
2399                                                 Debug( LDAP_DEBUG_SYNC,
2400                                                         "Entry %s CSN %s greater than snapshot %s\n",
2401                                                         rs->sr_entry->e_name.bv_val,
2402                                                         a->a_nvals[0].bv_val,
2403                                                         ss->ss_ctxcsn[i].bv_val );
2404                                                 return LDAP_SUCCESS;
2405                                         }
2406                                 }
2407                         }
2408
2409                         /* Don't send old entries twice */
2410                         if ( srs->sr_state.ctxcsn ) {
2411                                 for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2412                                         if ( sid == srs->sr_state.sids[i] &&
2413                                                 ber_bvcmp( &a->a_nvals[0],
2414                                                         &srs->sr_state.ctxcsn[i] )<= 0 ) {
2415                                                 Debug( LDAP_DEBUG_SYNC,
2416                                                         "Entry %s CSN %s older or equal to ctx %s\n",
2417                                                         rs->sr_entry->e_name.bv_val,
2418                                                         a->a_nvals[0].bv_val,
2419                                                         srs->sr_state.ctxcsn[i].bv_val );
2420                                                 return LDAP_SUCCESS;
2421                                         }
2422                                 }
2423                         }
2424                 }
2425                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2426                         op->o_tmpmemctx );
2427                 rs->sr_ctrls[1] = NULL;
2428                 rs->sr_flags |= REP_CTRLS_MUSTBEFREED;
2429                 /* If we're in delta-sync mode, always send a cookie */
2430                 if ( si->si_nopres && si->si_usehint && a ) {
2431                         struct berval cookie;
2432                         slap_compose_sync_cookie( op, &cookie, a->a_nvals, srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2433                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2434                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 1, &cookie );
2435                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2436                 } else {
2437                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2438                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
2439                 }
2440         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
2441                 struct berval cookie = BER_BVNULL;
2442
2443                 if ( ( ss->ss_flags & SS_CHANGED ) &&
2444                         ss->ss_ctxcsn && !BER_BVISNULL( &ss->ss_ctxcsn[0] )) {
2445                         slap_compose_sync_cookie( op, &cookie, ss->ss_ctxcsn,
2446                                 srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2447
2448                         Debug( LDAP_DEBUG_SYNC, "syncprov_search_response: cookie=%s\n", cookie.bv_val, 0, 0 );
2449                 }
2450
2451                 /* Is this a regular refresh?
2452                  * Note: refresh never gets here if there were no changes
2453                  */
2454                 if ( !ss->ss_so ) {
2455                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2456                                 op->o_tmpmemctx );
2457                         rs->sr_ctrls[1] = NULL;
2458                         rs->sr_flags |= REP_CTRLS_MUSTBEFREED;
2459                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
2460                                 0, 1, &cookie, ( ss->ss_flags & SS_PRESENT ) ?  LDAP_SYNC_REFRESH_PRESENTS :
2461                                         LDAP_SYNC_REFRESH_DELETES );
2462                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2463                 } else {
2464                 /* It's RefreshAndPersist, transition to Persist phase */
2465                         syncprov_sendinfo( op, rs, ( ss->ss_flags & SS_PRESENT ) ?
2466                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
2467                                 ( ss->ss_flags & SS_CHANGED ) ? &cookie : NULL,
2468                                 1, NULL, 0 );
2469                         if ( !BER_BVISNULL( &cookie ))
2470                                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2471
2472                         /* Detach this Op from frontend control */
2473                         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
2474
2475                         /* But not if this connection was closed along the way */
2476                         if ( op->o_abandon ) {
2477                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2478                                 /* syncprov_ab_cleanup will free this syncop */
2479                                 return SLAPD_ABANDON;
2480
2481                         } else {
2482                                 ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
2483                                 /* Turn off the refreshing flag */
2484                                 ss->ss_so->s_flags ^= PS_IS_REFRESHING;
2485
2486                                 syncprov_detach_op( op, ss->ss_so, on );
2487
2488                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2489
2490                                 /* If there are queued responses, fire them off */
2491                                 if ( ss->ss_so->s_res )
2492                                         syncprov_qstart( ss->ss_so );
2493                                 ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
2494                         }
2495
2496                         return LDAP_SUCCESS;
2497                 }
2498         }
2499
2500         return SLAP_CB_CONTINUE;
2501 }
2502
2503 static int
2504 syncprov_op_search( Operation *op, SlapReply *rs )
2505 {
2506         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2507         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2508         slap_callback   *cb;
2509         int gotstate = 0, changed = 0, do_present = 0;
2510         syncops *sop = NULL;
2511         searchstate *ss;
2512         sync_control *srs;
2513         BerVarray ctxcsn;
2514         int i, *sids, numcsns;
2515         struct berval mincsn, maxcsn;
2516         int minsid, maxsid;
2517         int dirty = 0;
2518
2519         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
2520
2521         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
2522                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
2523                 return rs->sr_err;
2524         }
2525
2526         srs = op->o_controls[slap_cids.sc_LDAPsync];
2527
2528         /* If this is a persistent search, set it up right away */
2529         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
2530                 syncops so = {0};
2531                 fbase_cookie fc;
2532                 opcookie opc;
2533                 slap_callback sc = {0};
2534
2535                 fc.fss = &so;
2536                 fc.fbase = 0;
2537                 so.s_eid = NOID;
2538                 so.s_op = op;
2539                 so.s_flags = PS_IS_REFRESHING | PS_FIND_BASE;
2540                 /* syncprov_findbase expects to be called as a callback... */
2541                 sc.sc_private = &opc;
2542                 opc.son = on;
2543                 ldap_pvt_thread_mutex_init( &so.s_mutex );
2544                 cb = op->o_callback;
2545                 op->o_callback = &sc;
2546                 rs->sr_err = syncprov_findbase( op, &fc );
2547                 op->o_callback = cb;
2548                 ldap_pvt_thread_mutex_destroy( &so.s_mutex );
2549
2550                 if ( rs->sr_err != LDAP_SUCCESS ) {
2551                         send_ldap_result( op, rs );
2552                         return rs->sr_err;
2553                 }
2554                 sop = ch_malloc( sizeof( syncops ));
2555                 *sop = so;
2556                 sop->s_rid = srs->sr_state.rid;
2557                 sop->s_sid = srs->sr_state.sid;
2558                 /* set refcount=2 to prevent being freed out from under us
2559                  * by abandons that occur while we're running here
2560                  */
2561                 sop->s_inuse = 2;
2562
2563                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2564                 while ( si->si_active ) {
2565                         /* Wait for active mods to finish before proceeding, as they
2566                          * may already have inspected the si_ops list looking for
2567                          * consumers to replicate the change to.  Using the log
2568                          * doesn't help, as we may finish playing it before the
2569                          * active mods gets added to it.
2570                          */
2571                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2572                         if ( slapd_shutdown ) {
2573                                 ch_free( sop );
2574                                 return SLAPD_ABANDON;
2575                         }
2576                         if ( !ldap_pvt_thread_pool_pausecheck( &connection_pool ))
2577                                 ldap_pvt_thread_yield();
2578                         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2579                 }
2580                 if ( op->o_abandon ) {
2581                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2582                         ch_free( sop );
2583                         return SLAPD_ABANDON;
2584                 }
2585                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
2586                 sop->s_next = si->si_ops;
2587                 sop->s_si = si;
2588                 si->si_ops = sop;
2589                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2590         }
2591
2592         /* snapshot the ctxcsn
2593          * Note: this must not be done before the psearch setup. (ITS#8365)
2594          */
2595         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2596         numcsns = si->si_numcsns;
2597         if ( numcsns ) {
2598                 ber_bvarray_dup_x( &ctxcsn, si->si_ctxcsn, op->o_tmpmemctx );
2599                 sids = op->o_tmpalloc( numcsns * sizeof(int), op->o_tmpmemctx );
2600                 for ( i=0; i<numcsns; i++ )
2601                         sids[i] = si->si_sids[i];
2602         } else {
2603                 ctxcsn = NULL;
2604                 sids = NULL;
2605         }
2606         dirty = si->si_dirty;
2607         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2608
2609         /* If we have a cookie, handle the PRESENT lookups */
2610         if ( srs->sr_state.ctxcsn ) {
2611                 sessionlog *sl;
2612                 int i, j;
2613
2614                 /* If we don't have any CSN of our own yet, bail out.
2615                  */
2616                 if ( !numcsns ) {
2617                         rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
2618                         rs->sr_text = "consumer has state info but provider doesn't!";
2619                         goto bailout;
2620                 }
2621
2622                 if ( !si->si_nopres )
2623                         do_present = SS_PRESENT;
2624
2625                 /* If there are SIDs we don't recognize in the cookie, drop them */
2626                 for (i=0; i<srs->sr_state.numcsns; ) {
2627                         for (j=i; j<numcsns; j++) {
2628                                 if ( srs->sr_state.sids[i] <= sids[j] ) {
2629                                         break;
2630                                 }
2631                         }
2632                         /* not found */
2633                         if ( j == numcsns || srs->sr_state.sids[i] != sids[j] ) {
2634                                 char *tmp = srs->sr_state.ctxcsn[i].bv_val;
2635                                 srs->sr_state.numcsns--;
2636                                 for ( j=i; j<srs->sr_state.numcsns; j++ ) {
2637                                         srs->sr_state.ctxcsn[j] = srs->sr_state.ctxcsn[j+1];
2638                                         srs->sr_state.sids[j] = srs->sr_state.sids[j+1];
2639                                 }
2640                                 srs->sr_state.ctxcsn[j].bv_val = tmp;
2641                                 srs->sr_state.ctxcsn[j].bv_len = 0;
2642                                 continue;
2643                         }
2644                         i++;
2645                 }
2646
2647                 if (srs->sr_state.numcsns != numcsns) {
2648                         /* consumer doesn't have the right number of CSNs */
2649                         changed = SS_CHANGED;
2650                         if ( srs->sr_state.ctxcsn ) {
2651                                 ber_bvarray_free_x( srs->sr_state.ctxcsn, op->o_tmpmemctx );
2652                                 srs->sr_state.ctxcsn = NULL;
2653                         }
2654                         if ( srs->sr_state.sids ) {
2655                                 slap_sl_free( srs->sr_state.sids, op->o_tmpmemctx );
2656                                 srs->sr_state.sids = NULL;
2657                         }
2658                         srs->sr_state.numcsns = 0;
2659                         goto shortcut;
2660                 }
2661
2662                 /* Find the smallest CSN which differs from contextCSN */
2663                 mincsn.bv_len = 0;
2664                 maxcsn.bv_len = 0;
2665                 for ( i=0,j=0; i<srs->sr_state.numcsns; i++ ) {
2666                         int newer;
2667                         while ( srs->sr_state.sids[i] != sids[j] ) j++;
2668                         if ( BER_BVISEMPTY( &maxcsn ) || ber_bvcmp( &maxcsn,
2669                                 &srs->sr_state.ctxcsn[i] ) < 0 ) {
2670                                 maxcsn = srs->sr_state.ctxcsn[i];
2671                                 maxsid = sids[j];
2672                         }
2673                         newer = ber_bvcmp( &srs->sr_state.ctxcsn[i], &ctxcsn[j] );
2674                         /* If our state is newer, tell consumer about changes */
2675                         if ( newer < 0) {
2676                                 changed = SS_CHANGED;
2677                                 if ( BER_BVISEMPTY( &mincsn ) || ber_bvcmp( &mincsn,
2678                                         &srs->sr_state.ctxcsn[i] ) > 0 ) {
2679                                         mincsn = srs->sr_state.ctxcsn[i];
2680                                         minsid = sids[j];
2681                                 }
2682                         } else if ( newer > 0 && sids[j] == slap_serverID ) {
2683                         /* our state is older, complain to consumer */
2684                                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
2685                                 rs->sr_text = "consumer state is newer than provider!";
2686 bailout:
2687                                 if ( sop ) {
2688                                         syncops **sp = &si->si_ops;
2689
2690                                         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2691                                         while ( *sp != sop )
2692                                                 sp = &(*sp)->s_next;
2693                                         *sp = sop->s_next;
2694                                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2695                                         ch_free( sop );
2696                                 }
2697                                 rs->sr_ctrls = NULL;
2698                                 send_ldap_result( op, rs );
2699                                 return rs->sr_err;
2700                         }
2701                 }
2702                 if ( BER_BVISEMPTY( &mincsn )) {
2703                         mincsn = maxcsn;
2704                         minsid = maxsid;
2705                 }
2706
2707                 /* If nothing has changed, shortcut it */
2708                 if ( !changed && !dirty ) {
2709                         do_present = 0;
2710 no_change:      if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
2711                                 LDAPControl     *ctrls[2];
2712
2713                                 ctrls[0] = NULL;
2714                                 ctrls[1] = NULL;
2715                                 syncprov_done_ctrl( op, rs, ctrls, 0, 0,
2716                                         NULL, LDAP_SYNC_REFRESH_DELETES );
2717                                 rs->sr_ctrls = ctrls;
2718                                 rs->sr_err = LDAP_SUCCESS;
2719                                 send_ldap_result( op, rs );
2720                                 rs->sr_ctrls = NULL;
2721                                 return rs->sr_err;
2722                         }
2723                         goto shortcut;
2724                 }
2725
2726                 /* Do we have a sessionlog for this search? */
2727                 sl=si->si_logs;
2728                 if ( sl ) {
2729                         int do_play = 0;
2730                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
2731                         /* Are there any log entries, and is the consumer state
2732                          * present in the session log?
2733                          */
2734                         if ( sl->sl_num > 0 ) {
2735                                 int i;
2736                                 for ( i=0; i<sl->sl_numcsns; i++ ) {
2737                                         /* SID not present == new enough */
2738                                         if ( minsid < sl->sl_sids[i] ) {
2739                                                 do_play = 1;
2740                                                 break;
2741                                         }
2742                                         /* SID present */
2743                                         if ( minsid == sl->sl_sids[i] ) {
2744                                                 /* new enough? */
2745                                                 if ( ber_bvcmp( &mincsn, &sl->sl_mincsn[i] ) >= 0 )
2746                                                         do_play = 1;
2747                                                 break;
2748                                         }
2749                                 }
2750                                 /* SID not present == new enough */
2751                                 if ( i == sl->sl_numcsns )
2752                                         do_play = 1;
2753                         }
2754                         if ( do_play ) {
2755                                 do_present = 0;
2756                                 /* mutex is unlocked in playlog */
2757                                 syncprov_playlog( op, rs, sl, srs, ctxcsn, numcsns, sids );
2758                         } else {
2759                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
2760                         }
2761                 }
2762                 /* Is the CSN still present in the database? */
2763                 if ( syncprov_findcsn( op, FIND_CSN, &mincsn ) != LDAP_SUCCESS ) {
2764                         /* No, so a reload is required */
2765                         /* the 2.2 consumer doesn't send this hint */
2766                         if ( si->si_usehint && srs->sr_rhint == 0 ) {
2767                                 if ( ctxcsn )
2768                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2769                                 if ( sids )
2770                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2771                                 rs->sr_err = LDAP_SYNC_REFRESH_REQUIRED;
2772                                 rs->sr_text = "sync cookie is stale";
2773                                 goto bailout;
2774                         }
2775                         if ( srs->sr_state.ctxcsn ) {
2776                                 ber_bvarray_free_x( srs->sr_state.ctxcsn, op->o_tmpmemctx );
2777                                 srs->sr_state.ctxcsn = NULL;
2778                         }
2779                         if ( srs->sr_state.sids ) {
2780                                 slap_sl_free( srs->sr_state.sids, op->o_tmpmemctx );
2781                                 srs->sr_state.sids = NULL;
2782                         }
2783                         srs->sr_state.numcsns = 0;
2784                 } else {
2785                         gotstate = 1;
2786                         /* If changed and doing Present lookup, send Present UUIDs */
2787                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT, 0 ) !=
2788                                 LDAP_SUCCESS ) {
2789                                 if ( ctxcsn )
2790                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2791                                 if ( sids )
2792                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2793                                 goto bailout;
2794                         }
2795                 }
2796         } else {
2797                 /* The consumer knows nothing, we know nothing. OK. */
2798                 if (!numcsns)
2799                         goto no_change;
2800                 /* No consumer state, assume something has changed */
2801                 changed = SS_CHANGED;
2802         }
2803
2804 shortcut:
2805         /* Append CSN range to search filter, save original filter
2806          * for persistent search evaluation
2807          */
2808         if ( sop ) {
2809                 ldap_pvt_thread_mutex_lock( &sop->s_mutex );
2810                 sop->s_filterstr = op->ors_filterstr;
2811                 /* correct the refcount that was set to 2 before */
2812                 sop->s_inuse--;
2813         }
2814
2815         /* If something changed, find the changes */
2816         if ( gotstate && ( changed || dirty ) ) {
2817                 Filter *fand, *fava;
2818
2819                 fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2820                 fand->f_choice = LDAP_FILTER_AND;
2821                 fand->f_next = NULL;
2822                 fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2823                 fand->f_and = fava;
2824                 fava->f_choice = LDAP_FILTER_GE;
2825                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
2826                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
2827 #ifdef LDAP_COMP_MATCH
2828                 fava->f_ava->aa_cf = NULL;
2829 #endif
2830                 ber_dupbv_x( &fava->f_ava->aa_value, &mincsn, op->o_tmpmemctx );
2831                 fava->f_next = op->ors_filter;
2832                 op->ors_filter = fand;
2833                 filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
2834                 if ( sop ) {
2835                         sop->s_flags |= PS_FIX_FILTER;
2836                 }
2837         }
2838         if ( sop ) {
2839                 ldap_pvt_thread_mutex_unlock( &sop->s_mutex );
2840         }
2841
2842         /* Let our callback add needed info to returned entries */
2843         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
2844         ss = (searchstate *)(cb+1);
2845         ss->ss_on = on;
2846         ss->ss_so = sop;
2847         ss->ss_flags = do_present | changed;
2848         ss->ss_ctxcsn = ctxcsn;
2849         ss->ss_numcsns = numcsns;
2850         ss->ss_sids = sids;
2851         cb->sc_response = syncprov_search_response;
2852         cb->sc_private = ss;
2853         cb->sc_next = op->o_callback;
2854         op->o_callback = cb;
2855
2856         /* If this is a persistent search and no changes were reported during
2857          * the refresh phase, just invoke the response callback to transition
2858          * us into persist phase
2859          */
2860         if ( !changed && !dirty ) {
2861                 rs->sr_err = LDAP_SUCCESS;
2862                 rs->sr_nentries = 0;
2863                 send_ldap_result( op, rs );
2864                 return rs->sr_err;
2865         }
2866         return SLAP_CB_CONTINUE;
2867 }
2868
2869 static int
2870 syncprov_operational(
2871         Operation *op,
2872         SlapReply *rs )
2873 {
2874         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2875         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2876
2877         /* This prevents generating unnecessarily; frontend will strip
2878          * any statically stored copy.
2879          */
2880         if ( op->o_sync != SLAP_CONTROL_NONE )
2881                 return SLAP_CB_CONTINUE;
2882
2883         if ( rs->sr_entry &&
2884                 dn_match( &rs->sr_entry->e_nname, &si->si_contextdn )) {
2885
2886                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
2887                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
2888                         Attribute *a, **ap = NULL;
2889
2890                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
2891                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
2892                                         break;
2893                         }
2894
2895                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2896                         if ( si->si_ctxcsn ) {
2897                                 if ( !a ) {
2898                                         for ( ap = &rs->sr_operational_attrs; *ap;
2899                                                 ap=&(*ap)->a_next );
2900
2901                                         a = attr_alloc( slap_schema.si_ad_contextCSN );
2902                                         *ap = a;
2903                                 }
2904
2905                                 if ( !ap ) {
2906                                         if ( rs_entry2modifiable( op, rs, on )) {
2907                                                 a = attr_find( rs->sr_entry->e_attrs,
2908                                                         slap_schema.si_ad_contextCSN );
2909                                         }
2910                                         if ( a->a_nvals != a->a_vals ) {
2911                                                 ber_bvarray_free( a->a_nvals );
2912                                         }
2913                                         a->a_nvals = NULL;
2914                                         ber_bvarray_free( a->a_vals );
2915                                         a->a_vals = NULL;
2916                                         a->a_numvals = 0;
2917                                 }
2918                                 attr_valadd( a, si->si_ctxcsn, si->si_ctxcsn, si->si_numcsns );
2919                         }
2920                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2921                 }
2922         }
2923         return SLAP_CB_CONTINUE;
2924 }
2925
2926 enum {
2927         SP_CHKPT = 1,
2928         SP_SESSL,
2929         SP_NOPRES,
2930         SP_USEHINT
2931 };
2932
2933 static ConfigDriver sp_cf_gen;
2934
2935 static ConfigTable spcfg[] = {
2936         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2937                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2938                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2939                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2940         { "syncprov-sessionlog", "ops", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2941                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2942                         "DESC 'Session log size in ops' "
2943                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2944         { "syncprov-nopresent", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_NOPRES,
2945                 sp_cf_gen, "( OLcfgOvAt:1.3 NAME 'olcSpNoPresent' "
2946                         "DESC 'Omit Present phase processing' "
2947                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2948         { "syncprov-reloadhint", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_USEHINT,
2949                 sp_cf_gen, "( OLcfgOvAt:1.4 NAME 'olcSpReloadHint' "
2950                         "DESC 'Observe Reload Hint in Request control' "
2951                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2952         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2953 };
2954
2955 static ConfigOCs spocs[] = {
2956         { "( OLcfgOvOc:1.1 "
2957                 "NAME 'olcSyncProvConfig' "
2958                 "DESC 'SyncRepl Provider configuration' "
2959                 "SUP olcOverlayConfig "
2960                 "MAY ( olcSpCheckpoint "
2961                         "$ olcSpSessionlog "
2962                         "$ olcSpNoPresent "
2963                         "$ olcSpReloadHint "
2964                 ") )",
2965                         Cft_Overlay, spcfg },
2966         { NULL, 0, NULL }
2967 };
2968
2969 static int
2970 sp_cf_gen(ConfigArgs *c)
2971 {
2972         slap_overinst           *on = (slap_overinst *)c->bi;
2973         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2974         int rc = 0;
2975
2976         if ( c->op == SLAP_CONFIG_EMIT ) {
2977                 switch ( c->type ) {
2978                 case SP_CHKPT:
2979                         if ( si->si_chkops || si->si_chktime ) {
2980                                 struct berval bv;
2981                                 /* we assume si_chktime is a multiple of 60
2982                                  * because the parsed value was originally
2983                                  * multiplied by 60 */
2984                                 bv.bv_len = snprintf( c->cr_msg, sizeof( c->cr_msg ),
2985                                         "%d %d", si->si_chkops, si->si_chktime/60 );
2986                                 if ( bv.bv_len >= sizeof( c->cr_msg ) ) {
2987                                         rc = 1;
2988                                 } else {
2989                                         bv.bv_val = c->cr_msg;
2990                                         value_add_one( &c->rvalue_vals, &bv );
2991                                 }
2992                         } else {
2993                                 rc = 1;
2994                         }
2995                         break;
2996                 case SP_SESSL:
2997                         if ( si->si_logs ) {
2998                                 c->value_int = si->si_logs->sl_size;
2999                         } else {
3000                                 rc = 1;
3001                         }
3002                         break;
3003                 case SP_NOPRES:
3004                         if ( si->si_nopres ) {
3005                                 c->value_int = 1;
3006                         } else {
3007                                 rc = 1;
3008                         }
3009                         break;
3010                 case SP_USEHINT:
3011                         if ( si->si_usehint ) {
3012                                 c->value_int = 1;
3013                         } else {
3014                                 rc = 1;
3015                         }
3016                         break;
3017                 }
3018                 return rc;
3019         } else if ( c->op == LDAP_MOD_DELETE ) {
3020                 switch ( c->type ) {
3021                 case SP_CHKPT:
3022                         si->si_chkops = 0;
3023                         si->si_chktime = 0;
3024                         break;
3025                 case SP_SESSL:
3026                         if ( si->si_logs )
3027                                 si->si_logs->sl_size = 0;
3028                         else
3029                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
3030                         break;
3031                 case SP_NOPRES:
3032                         if ( si->si_nopres )
3033                                 si->si_nopres = 0;
3034                         else
3035                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
3036                         break;
3037                 case SP_USEHINT:
3038                         if ( si->si_usehint )
3039                                 si->si_usehint = 0;
3040                         else
3041                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
3042                         break;
3043                 }
3044                 return rc;
3045         }
3046         switch ( c->type ) {
3047         case SP_CHKPT:
3048                 if ( lutil_atoi( &si->si_chkops, c->argv[1] ) != 0 ) {
3049                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint ops # \"%s\"",
3050                                 c->argv[0], c->argv[1] );
3051                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
3052                                 "%s: %s\n", c->log, c->cr_msg, 0 );
3053                         return ARG_BAD_CONF;
3054                 }
3055                 if ( si->si_chkops <= 0 ) {
3056                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint ops # \"%d\"",
3057                                 c->argv[0], si->si_chkops );
3058                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
3059                                 "%s: %s\n", c->log, c->cr_msg, 0 );
3060                         return ARG_BAD_CONF;
3061                 }
3062                 if ( lutil_atoi( &si->si_chktime, c->argv[2] ) != 0 ) {
3063                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint time \"%s\"",
3064                                 c->argv[0], c->argv[1] );
3065                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
3066                                 "%s: %s\n", c->log, c->cr_msg, 0 );
3067                         return ARG_BAD_CONF;
3068                 }
3069                 if ( si->si_chktime <= 0 ) {
3070                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint time \"%d\"",
3071                                 c->argv[0], si->si_chkops );
3072                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
3073                                 "%s: %s\n", c->log, c->cr_msg, 0 );
3074                         return ARG_BAD_CONF;
3075                 }
3076                 si->si_chktime *= 60;
3077                 break;
3078         case SP_SESSL: {
3079                 sessionlog *sl;
3080                 int size = c->value_int;
3081
3082                 if ( size < 0 ) {
3083                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s size %d is negative",
3084                                 c->argv[0], size );
3085                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
3086                                 "%s: %s\n", c->log, c->cr_msg, 0 );
3087                         return ARG_BAD_CONF;
3088                 }
3089                 sl = si->si_logs;
3090                 if ( !sl ) {
3091                         sl = ch_malloc( sizeof( sessionlog ));
3092                         sl->sl_mincsn = NULL;
3093                         sl->sl_sids = NULL;
3094                         sl->sl_num = 0;
3095                         sl->sl_numcsns = 0;
3096                         sl->sl_head = sl->sl_tail = NULL;
3097                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
3098                         si->si_logs = sl;
3099                 }
3100                 sl->sl_size = size;
3101                 }
3102                 break;
3103         case SP_NOPRES:
3104                 si->si_nopres = c->value_int;
3105                 break;
3106         case SP_USEHINT:
3107                 si->si_usehint = c->value_int;
3108                 break;
3109         }
3110         return rc;
3111 }
3112
3113 /* ITS#3456 we cannot run this search on the main thread, must use a
3114  * child thread in order to insure we have a big enough stack.
3115  */
3116 static void *
3117 syncprov_db_otask(
3118         void *ptr
3119 )
3120 {
3121         syncprov_findcsn( ptr, FIND_MAXCSN, 0 );
3122         return NULL;
3123 }
3124
3125
3126 /* Read any existing contextCSN from the underlying db.
3127  * Then search for any entries newer than that. If no value exists,
3128  * just generate it. Cache whatever result.
3129  */
3130 static int
3131 syncprov_db_open(
3132         BackendDB *be,
3133         ConfigReply *cr
3134 )
3135 {
3136         slap_overinst   *on = (slap_overinst *) be->bd_info;
3137         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3138
3139         Connection conn = { 0 };
3140         OperationBuffer opbuf;
3141         Operation *op;
3142         Entry *e = NULL;
3143         Attribute *a;
3144         int rc;
3145         void *thrctx = NULL;
3146
3147         if ( !SLAP_LASTMOD( be )) {
3148                 Debug( LDAP_DEBUG_ANY,
3149                         "syncprov_db_open: invalid config, lastmod must be enabled\n", 0, 0, 0 );
3150                 return -1;
3151         }
3152
3153         if ( slapMode & SLAP_TOOL_MODE ) {
3154                 return 0;
3155         }
3156
3157         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
3158         if ( rc ) {
3159                 return rc;
3160         }
3161
3162         thrctx = ldap_pvt_thread_pool_context();
3163         connection_fake_init2( &conn, &opbuf, thrctx, 0 );
3164         op = &opbuf.ob_op;
3165         op->o_bd = be;
3166         op->o_dn = be->be_rootdn;
3167         op->o_ndn = be->be_rootndn;
3168
3169         if ( SLAP_SYNC_SUBENTRY( be )) {
3170                 build_new_dn( &si->si_contextdn, be->be_nsuffix,
3171                         (struct berval *)&slap_ldapsync_cn_bv, NULL );
3172         } else {
3173                 si->si_contextdn = be->be_nsuffix[0];
3174         }
3175         rc = overlay_entry_get_ov( op, &si->si_contextdn, NULL,
3176                 slap_schema.si_ad_contextCSN, 0, &e, on );
3177
3178         if ( e ) {
3179                 ldap_pvt_thread_t tid;
3180
3181                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
3182                 if ( a ) {
3183                         ber_bvarray_dup_x( &si->si_ctxcsn, a->a_vals, NULL );
3184                         si->si_numcsns = a->a_numvals;
3185                         si->si_sids = slap_parse_csn_sids( si->si_ctxcsn, a->a_numvals, NULL );
3186                         slap_sort_csn_sids( si->si_ctxcsn, si->si_sids, si->si_numcsns, NULL );
3187                 }
3188                 overlay_entry_release_ov( op, e, 0, on );
3189                 if ( si->si_ctxcsn && !SLAP_DBCLEAN( be )) {
3190                         op->o_tag = LDAP_REQ_SEARCH;
3191                         op->o_req_dn = be->be_suffix[0];
3192                         op->o_req_ndn = be->be_nsuffix[0];
3193                         op->ors_scope = LDAP_SCOPE_SUBTREE;
3194                         ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
3195                         ldap_pvt_thread_join( tid, NULL );
3196                 }
3197         }
3198
3199         /* Didn't find a contextCSN, should we generate one? */
3200         if ( !si->si_ctxcsn ) {
3201                 char csnbuf[ LDAP_PVT_CSNSTR_BUFSIZE ];
3202                 struct berval csn;
3203
3204                 if ( slap_serverID || SLAP_SYNC_SHADOW( op->o_bd )) {
3205                 /* If we're also a consumer, then don't generate anything.
3206                  * Wait for our provider to send it to us, or for a local
3207                  * modify if we have multimaster.
3208                  */
3209                         goto out;
3210                 }
3211                 csn.bv_val = csnbuf;
3212                 csn.bv_len = sizeof( csnbuf );
3213                 slap_get_csn( op, &csn, 0 );
3214                 value_add_one( &si->si_ctxcsn, &csn );
3215                 si->si_numcsns = 1;
3216                 si->si_sids = ch_malloc( sizeof(int) );
3217                 si->si_sids[0] = slap_serverID;
3218
3219                 /* make sure we do a checkpoint on close */
3220                 si->si_numops++;
3221         }
3222
3223         /* Initialize the sessionlog mincsn */
3224         if ( si->si_logs && si->si_numcsns ) {
3225                 sessionlog *sl = si->si_logs;
3226                 int i;
3227                 ber_bvarray_dup_x( &sl->sl_mincsn, si->si_ctxcsn, NULL );
3228                 sl->sl_numcsns = si->si_numcsns;
3229                 sl->sl_sids = ch_malloc( si->si_numcsns * sizeof(int) );
3230                 for ( i=0; i < si->si_numcsns; i++ )
3231                         sl->sl_sids[i] = si->si_sids[i];
3232         }
3233
3234 out:
3235         op->o_bd->bd_info = (BackendInfo *)on;
3236         return 0;
3237 }
3238
3239 /* Write the current contextCSN into the underlying db.
3240  */
3241 static int
3242 syncprov_db_close(
3243         BackendDB *be,
3244         ConfigReply *cr
3245 )
3246 {
3247     slap_overinst   *on = (slap_overinst *) be->bd_info;
3248     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3249 #ifdef SLAP_CONFIG_DELETE
3250         syncops *so, *sonext;
3251 #endif /* SLAP_CONFIG_DELETE */
3252
3253         if ( slapMode & SLAP_TOOL_MODE ) {
3254                 return 0;
3255         }
3256         if ( si->si_numops ) {
3257                 Connection conn = {0};
3258                 OperationBuffer opbuf;
3259                 Operation *op;
3260                 void *thrctx;
3261
3262                 thrctx = ldap_pvt_thread_pool_context();
3263                 connection_fake_init2( &conn, &opbuf, thrctx, 0 );
3264                 op = &opbuf.ob_op;
3265                 op->o_bd = be;
3266                 op->o_dn = be->be_rootdn;
3267                 op->o_ndn = be->be_rootndn;
3268                 syncprov_checkpoint( op, on );
3269         }
3270
3271 #ifdef SLAP_CONFIG_DELETE
3272         if ( !slapd_shutdown ) {
3273                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
3274                 for ( so=si->si_ops, sonext=so;  so; so=sonext  ) {
3275                         SlapReply rs = {REP_RESULT};
3276                         rs.sr_err = LDAP_UNAVAILABLE;
3277                         send_ldap_result( so->s_op, &rs );
3278                         sonext=so->s_next;
3279                         syncprov_drop_psearch( so, 0);
3280                 }
3281                 si->si_ops=NULL;
3282                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
3283         }
3284         overlay_unregister_control( be, LDAP_CONTROL_SYNC );
3285 #endif /* SLAP_CONFIG_DELETE */
3286
3287     return 0;
3288 }
3289
3290 static int
3291 syncprov_db_init(
3292         BackendDB *be,
3293         ConfigReply *cr
3294 )
3295 {
3296         slap_overinst   *on = (slap_overinst *)be->bd_info;
3297         syncprov_info_t *si;
3298
3299         if ( SLAP_ISGLOBALOVERLAY( be ) ) {
3300                 Debug( LDAP_DEBUG_ANY,
3301                         "syncprov must be instantiated within a database.\n",
3302                         0, 0, 0 );
3303                 return 1;
3304         }
3305
3306         si = ch_calloc(1, sizeof(syncprov_info_t));
3307         on->on_bi.bi_private = si;
3308         ldap_pvt_thread_rdwr_init( &si->si_csn_rwlock );
3309         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
3310         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
3311         ldap_pvt_thread_mutex_init( &si->si_resp_mutex );
3312
3313         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
3314         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
3315         csn_anlist[1].an_desc = slap_schema.si_ad_entryUUID;
3316         csn_anlist[1].an_name = slap_schema.si_ad_entryUUID->ad_cname;
3317
3318         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
3319         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
3320
3321         return 0;
3322 }
3323
3324 static int
3325 syncprov_db_destroy(
3326         BackendDB *be,
3327         ConfigReply *cr
3328 )
3329 {
3330         slap_overinst   *on = (slap_overinst *)be->bd_info;
3331         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3332
3333         if ( si ) {
3334                 if ( si->si_logs ) {
3335                         sessionlog *sl = si->si_logs;
3336                         slog_entry *se = sl->sl_head;
3337
3338                         while ( se ) {
3339                                 slog_entry *se_next = se->se_next;
3340                                 ch_free( se );
3341                                 se = se_next;
3342                         }
3343                         if ( sl->sl_mincsn )
3344                                 ber_bvarray_free( sl->sl_mincsn );
3345                         if ( sl->sl_sids )
3346                                 ch_free( sl->sl_sids );
3347
3348                         ldap_pvt_thread_mutex_destroy(&si->si_logs->sl_mutex);
3349                         ch_free( si->si_logs );
3350                 }
3351                 if ( si->si_ctxcsn )
3352                         ber_bvarray_free( si->si_ctxcsn );
3353                 if ( si->si_sids )
3354                         ch_free( si->si_sids );
3355                 ldap_pvt_thread_mutex_destroy( &si->si_resp_mutex );
3356                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
3357                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
3358                 ldap_pvt_thread_rdwr_destroy( &si->si_csn_rwlock );
3359                 ch_free( si );
3360         }
3361
3362         return 0;
3363 }
3364
3365 static int syncprov_parseCtrl (
3366         Operation *op,
3367         SlapReply *rs,
3368         LDAPControl *ctrl )
3369 {
3370         ber_tag_t tag;
3371         BerElementBuffer berbuf;
3372         BerElement *ber = (BerElement *)&berbuf;
3373         ber_int_t mode;
3374         ber_len_t len;
3375         struct berval cookie = BER_BVNULL;
3376         sync_control *sr;
3377         int rhint = 0;
3378
3379         if ( op->o_sync != SLAP_CONTROL_NONE ) {
3380                 rs->sr_text = "Sync control specified multiple times";
3381                 return LDAP_PROTOCOL_ERROR;
3382         }
3383
3384         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
3385                 rs->sr_text = "Sync control specified with pagedResults control";
3386                 return LDAP_PROTOCOL_ERROR;
3387         }
3388
3389         if ( BER_BVISNULL( &ctrl->ldctl_value ) ) {
3390                 rs->sr_text = "Sync control value is absent";
3391                 return LDAP_PROTOCOL_ERROR;
3392         }
3393
3394         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
3395                 rs->sr_text = "Sync control value is empty";
3396                 return LDAP_PROTOCOL_ERROR;
3397         }
3398
3399         /* Parse the control value
3400          *      syncRequestValue ::= SEQUENCE {
3401          *              mode   ENUMERATED {
3402          *                      -- 0 unused
3403          *                      refreshOnly             (1),
3404          *                      -- 2 reserved
3405          *                      refreshAndPersist       (3)
3406          *              },
3407          *              cookie  syncCookie OPTIONAL
3408          *      }
3409          */
3410
3411         ber_init2( ber, &ctrl->ldctl_value, 0 );
3412
3413         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
3414                 rs->sr_text = "Sync control : mode decoding error";
3415                 return LDAP_PROTOCOL_ERROR;
3416         }
3417
3418         switch( mode ) {
3419         case LDAP_SYNC_REFRESH_ONLY:
3420                 mode = SLAP_SYNC_REFRESH;
3421                 break;
3422         case LDAP_SYNC_REFRESH_AND_PERSIST:
3423                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
3424                 break;
3425         default:
3426                 rs->sr_text = "Sync control : unknown update mode";
3427                 return LDAP_PROTOCOL_ERROR;
3428         }
3429
3430         tag = ber_peek_tag( ber, &len );
3431
3432         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
3433                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
3434                         rs->sr_text = "Sync control : cookie decoding error";
3435                         return LDAP_PROTOCOL_ERROR;
3436                 }
3437                 tag = ber_peek_tag( ber, &len );
3438         }
3439         if ( tag == LDAP_TAG_RELOAD_HINT ) {
3440                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
3441                         rs->sr_text = "Sync control : rhint decoding error";
3442                         return LDAP_PROTOCOL_ERROR;
3443                 }
3444         }
3445         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
3446                         rs->sr_text = "Sync control : decoding error";
3447                         return LDAP_PROTOCOL_ERROR;
3448         }
3449         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
3450         sr->sr_rhint = rhint;
3451         if (!BER_BVISNULL(&cookie)) {
3452                 ber_dupbv_x( &sr->sr_state.octet_str, &cookie, op->o_tmpmemctx );
3453                 /* If parse fails, pretend no cookie was sent */
3454                 if ( slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx ) ||
3455                         sr->sr_state.rid == -1 ) {
3456                         if ( sr->sr_state.ctxcsn ) {
3457                                 ber_bvarray_free_x( sr->sr_state.ctxcsn, op->o_tmpmemctx );
3458                                 sr->sr_state.ctxcsn = NULL;
3459                         }
3460                         sr->sr_state.numcsns = 0;
3461                 }
3462         }
3463
3464         op->o_controls[slap_cids.sc_LDAPsync] = sr;
3465
3466         op->o_sync = ctrl->ldctl_iscritical
3467                 ? SLAP_CONTROL_CRITICAL
3468                 : SLAP_CONTROL_NONCRITICAL;
3469
3470         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
3471
3472         return LDAP_SUCCESS;
3473 }
3474
3475 /* This overlay is set up for dynamic loading via moduleload. For static
3476  * configuration, you'll need to arrange for the slap_overinst to be
3477  * initialized and registered by some other function inside slapd.
3478  */
3479
3480 static slap_overinst            syncprov;
3481
3482 int
3483 syncprov_initialize()
3484 {
3485         int rc;
3486
3487         rc = register_supported_control( LDAP_CONTROL_SYNC,
3488                 SLAP_CTRL_SEARCH, NULL,
3489                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
3490         if ( rc != LDAP_SUCCESS ) {
3491                 Debug( LDAP_DEBUG_ANY,
3492                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
3493                 return rc;
3494         }
3495
3496         syncprov.on_bi.bi_type = "syncprov";
3497         syncprov.on_bi.bi_db_init = syncprov_db_init;
3498         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
3499         syncprov.on_bi.bi_db_open = syncprov_db_open;
3500         syncprov.on_bi.bi_db_close = syncprov_db_close;
3501
3502         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
3503         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
3504
3505         syncprov.on_bi.bi_op_add = syncprov_op_mod;
3506         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
3507         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
3508         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
3509         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
3510         syncprov.on_bi.bi_op_search = syncprov_op_search;
3511         syncprov.on_bi.bi_extended = syncprov_op_extended;
3512         syncprov.on_bi.bi_operational = syncprov_operational;
3513
3514         syncprov.on_bi.bi_cf_ocs = spocs;
3515
3516         generic_filter.f_desc = slap_schema.si_ad_objectClass;
3517
3518         rc = config_register_schema( spcfg, spocs );
3519         if ( rc ) return rc;
3520
3521         return overlay_register( &syncprov );
3522 }
3523
3524 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
3525 int
3526 init_module( int argc, char *argv[] )
3527 {
3528         return syncprov_initialize();
3529 }
3530 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
3531
3532 #endif /* defined(SLAPD_OVER_SYNCPROV) */