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         void *s_pool_cookie;
  93         ldap_pvt_thread_mutex_t s_mutex;
  94 } syncops;
  95
  96 /* A received sync control */
  97 typedef struct sync_control {
  98         struct sync_cookie sr_state;
  99         int sr_rhint;
 100 } sync_control;
 101
 102 #if 0 /* moved back to slap.h */
 103 #define o_sync  o_ctrlflag[slap_cids.sc_LDAPsync]
 104 #endif
 105 /* o_sync_mode uses data bits of o_sync */
 106 #define o_sync_mode     o_ctrlflag[slap_cids.sc_LDAPsync]
 107
 108 #define SLAP_SYNC_NONE                                  (LDAP_SYNC_NONE<<SLAP_CONTROL_SHIFT)
 109 #define SLAP_SYNC_REFRESH                               (LDAP_SYNC_REFRESH_ONLY<<SLAP_CONTROL_SHIFT)
 110 #define SLAP_SYNC_PERSIST                               (LDAP_SYNC_RESERVED<<SLAP_CONTROL_SHIFT)
 111 #define SLAP_SYNC_REFRESH_AND_PERSIST   (LDAP_SYNC_REFRESH_AND_PERSIST<<SLAP_CONTROL_SHIFT)
 112
 113 /* Record of which searches matched at premodify step */
 114 typedef struct syncmatches {
 115         struct syncmatches *sm_next;
 116         syncops *sm_op;
 117 } syncmatches;
 118
 119 /* Session log data */
 120 typedef struct slog_entry {
 121         struct slog_entry *se_next;
 122         struct berval se_uuid;
 123         struct berval se_csn;
 124         int     se_sid;
 125         ber_tag_t       se_tag;
 126 } slog_entry;
 127
 128 typedef struct sessionlog {
 129         BerVarray       sl_mincsn;
 130         int             *sl_sids;
 131         int             sl_numcsns;
 132         int             sl_num;
 133         int             sl_size;
 134         int             sl_playing;
 135         slog_entry *sl_head;
 136         slog_entry *sl_tail;
 137         ldap_pvt_thread_mutex_t sl_mutex;
 138 } sessionlog;
 139
 140 /* The main state for this overlay */
 141 typedef struct syncprov_info_t {
 142         syncops         *si_ops;
 143         struct berval   si_contextdn;
 144         BerVarray       si_ctxcsn;      /* ldapsync context */
 145         int             *si_sids;
 146         int             si_numcsns;
 147         int             si_chkops;      /* checkpointing info */
 148         int             si_chktime;
 149         int             si_numops;      /* number of ops since last checkpoint */
 150         int             si_nopres;      /* Skip present phase */
 151         int             si_usehint;     /* use reload hint */
 152         int             si_active;      /* True if there are active mods */
 153         int             si_dirty;       /* True if the context is dirty, i.e changes
 154                                                  * have been made without updating the csn. */
 155         time_t  si_chklast;     /* time of last checkpoint */
 156         Avlnode *si_mods;       /* entries being modified */
 157         sessionlog      *si_logs;
 158         ldap_pvt_thread_rdwr_t  si_csn_rwlock;
 159         ldap_pvt_thread_mutex_t si_ops_mutex;
 160         ldap_pvt_thread_mutex_t si_mods_mutex;
 161         ldap_pvt_thread_mutex_t si_resp_mutex;
 162 } syncprov_info_t;
 163
 164 typedef struct opcookie {
 165         slap_overinst *son;
 166         syncmatches *smatches;
 167         modtarget *smt;
 168         Entry *se;
 169         struct berval sdn;      /* DN of entry, for deletes */
 170         struct berval sndn;
 171         struct berval suuid;    /* UUID of entry */
 172         struct berval sctxcsn;
 173         short osid;     /* sid of op csn */
 174         short rsid;     /* sid of relay */
 175         short sreference;       /* Is the entry a reference? */
 176         syncres ssres;
 177 } opcookie;
 178
 179 typedef struct fbase_cookie {
 180         struct berval *fdn;     /* DN of a modified entry, for scope testing */
 181         syncops *fss;   /* persistent search we're testing against */
 182         int fbase;      /* if TRUE we found the search base and it's still valid */
 183         int fscope;     /* if TRUE then fdn is within the psearch scope */
 184 } fbase_cookie;
 185
 186 static AttributeName csn_anlist[3];
 187 static AttributeName uuid_anlist[2];
 188
 189 /* Build a LDAPsync intermediate state control */
 190 static int
 191 syncprov_state_ctrl(
 192         Operation       *op,
 193         SlapReply       *rs,
 194         Entry           *e,
 195         int             entry_sync_state,
 196         LDAPControl     **ctrls,
 197         int             num_ctrls,
 198         int             send_cookie,
 199         struct berval   *cookie )
 200 {
 201         Attribute* a;
 202         int ret;
 203
 204         BerElementBuffer berbuf;
 205         BerElement *ber = (BerElement *)&berbuf;
 206         LDAPControl *cp;
 207         struct berval bv;
 208         struct berval   entryuuid_bv = BER_BVNULL;
 209
 210         ber_init2( ber, 0, LBER_USE_DER );
 211         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 212
 213         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 214                 AttributeDescription *desc = a->a_desc;
 215                 if ( desc == slap_schema.si_ad_entryUUID ) {
 216                         entryuuid_bv = a->a_nvals[0];
 217                         break;
 218                 }
 219         }
 220
 221         /* FIXME: what if entryuuid is NULL or empty ? */
 222
 223         if ( send_cookie && cookie ) {
 224                 ber_printf( ber, "{eOON}",
 225                         entry_sync_state, &entryuuid_bv, cookie );
 226         } else {
 227                 ber_printf( ber, "{eON}",
 228                         entry_sync_state, &entryuuid_bv );
 229         }
 230
 231         ret = ber_flatten2( ber, &bv, 0 );
 232         if ( ret == 0 ) {
 233                 cp = op->o_tmpalloc( sizeof( LDAPControl ) + bv.bv_len, op->o_tmpmemctx );
 234                 cp->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 235                 cp->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 236                 cp->ldctl_value.bv_val = (char *)&cp[1];
 237                 cp->ldctl_value.bv_len = bv.bv_len;
 238                 AC_MEMCPY( cp->ldctl_value.bv_val, bv.bv_val, bv.bv_len );
 239                 ctrls[num_ctrls] = cp;
 240         }
 241         ber_free_buf( ber );
 242
 243         if ( ret < 0 ) {
 244                 Debug( LDAP_DEBUG_TRACE,
 245                         "slap_build_sync_ctrl: ber_flatten2 failed (%d)\n",
 246                         ret, 0, 0 );
 247                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 248                 return LDAP_OTHER;
 249         }
 250
 251         return LDAP_SUCCESS;
 252 }
 253
 254 /* Build a LDAPsync final state control */
 255 static int
 256 syncprov_done_ctrl(
 257         Operation       *op,
 258         SlapReply       *rs,
 259         LDAPControl     **ctrls,
 260         int                     num_ctrls,
 261         int                     send_cookie,
 262         struct berval *cookie,
 263         int                     refreshDeletes )
 264 {
 265         int ret;
 266         BerElementBuffer berbuf;
 267         BerElement *ber = (BerElement *)&berbuf;
 268         LDAPControl *cp;
 269         struct berval bv;
 270
 271         ber_init2( ber, NULL, LBER_USE_DER );
 272         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 273
 274         ber_printf( ber, "{" );
 275         if ( send_cookie && cookie ) {
 276                 ber_printf( ber, "O", cookie );
 277         }
 278         if ( refreshDeletes == LDAP_SYNC_REFRESH_DELETES ) {
 279                 ber_printf( ber, "b", refreshDeletes );
 280         }
 281         ber_printf( ber, "N}" );
 282
 283         ret = ber_flatten2( ber, &bv, 0 );
 284         if ( ret == 0 ) {
 285                 cp = op->o_tmpalloc( sizeof( LDAPControl ) + bv.bv_len, op->o_tmpmemctx );
 286                 cp->ldctl_oid = LDAP_CONTROL_SYNC_DONE;
 287                 cp->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 288                 cp->ldctl_value.bv_val = (char *)&cp[1];
 289                 cp->ldctl_value.bv_len = bv.bv_len;
 290                 AC_MEMCPY( cp->ldctl_value.bv_val, bv.bv_val, bv.bv_len );
 291                 ctrls[num_ctrls] = cp;
 292         }
 293
 294         ber_free_buf( ber );
 295
 296         if ( ret < 0 ) {
 297                 Debug( LDAP_DEBUG_TRACE,
 298                         "syncprov_done_ctrl: ber_flatten2 failed (%d)\n",
 299                         ret, 0, 0 );
 300                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 301                 return LDAP_OTHER;
 302         }
 303
 304         return LDAP_SUCCESS;
 305 }
 306
 307 static int
 308 syncprov_sendinfo(
 309         Operation       *op,
 310         SlapReply       *rs,
 311         int                     type,
 312         struct berval *cookie,
 313         int                     refreshDone,
 314         BerVarray       syncUUIDs,
 315         int                     refreshDeletes )
 316 {
 317         BerElementBuffer berbuf;
 318         BerElement *ber = (BerElement *)&berbuf;
 319         struct berval rspdata;
 320
 321         int ret;
 322
 323         ber_init2( ber, NULL, LBER_USE_DER );
 324         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 325
 326         if ( type ) {
 327                 switch ( type ) {
 328                 case LDAP_TAG_SYNC_NEW_COOKIE:
 329                         ber_printf( ber, "tO", type, cookie );
 330                         break;
 331                 case LDAP_TAG_SYNC_REFRESH_DELETE:
 332                 case LDAP_TAG_SYNC_REFRESH_PRESENT:
 333                         ber_printf( ber, "t{", type );
 334                         if ( cookie ) {
 335                                 ber_printf( ber, "O", cookie );
 336                         }
 337                         if ( refreshDone == 0 ) {
 338                                 ber_printf( ber, "b", refreshDone );
 339                         }
 340                         ber_printf( ber, "N}" );
 341                         break;
 342                 case LDAP_TAG_SYNC_ID_SET:
 343                         ber_printf( ber, "t{", type );
 344                         if ( cookie ) {
 345                                 ber_printf( ber, "O", cookie );
 346                         }
 347                         if ( refreshDeletes == 1 ) {
 348                                 ber_printf( ber, "b", refreshDeletes );
 349                         }
 350                         ber_printf( ber, "[W]", syncUUIDs );
 351                         ber_printf( ber, "N}" );
 352                         break;
 353                 default:
 354                         Debug( LDAP_DEBUG_TRACE,
 355                                 "syncprov_sendinfo: invalid syncinfo type (%d)\n",
 356                                 type, 0, 0 );
 357                         return LDAP_OTHER;
 358                 }
 359         }
 360
 361         ret = ber_flatten2( ber, &rspdata, 0 );
 362
 363         if ( ret < 0 ) {
 364                 Debug( LDAP_DEBUG_TRACE,
 365                         "syncprov_sendinfo: ber_flatten2 failed (%d)\n",
 366                         ret, 0, 0 );
 367                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 368                 return LDAP_OTHER;
 369         }
 370
 371         rs->sr_rspoid = LDAP_SYNC_INFO;
 372         rs->sr_rspdata = &rspdata;
 373         send_ldap_intermediate( op, rs );
 374         rs->sr_rspdata = NULL;
 375         ber_free_buf( ber );
 376
 377         return LDAP_SUCCESS;
 378 }
 379
 380 /* Find a modtarget in an AVL tree */
 381 static int
 382 sp_avl_cmp( const void *c1, const void *c2 )
 383 {
 384         const modtarget *m1, *m2;
 385         int rc;
 386
 387         m1 = c1; m2 = c2;
 388         rc = m1->mt_dn.bv_len - m2->mt_dn.bv_len;
 389
 390         if ( rc ) return rc;
 391         return ber_bvcmp( &m1->mt_dn, &m2->mt_dn );
 392 }
 393
 394 /* syncprov_findbase:
 395  *   finds the true DN of the base of a search (with alias dereferencing) and
 396  * checks to make sure the base entry doesn't get replaced with a different
 397  * entry (e.g., swapping trees via ModDN, or retargeting an alias). If a
 398  * change is detected, any persistent search on this base must be terminated /
 399  * reloaded.
 400  *   On the first call, we just save the DN and entryID. On subsequent calls
 401  * we compare the DN and entryID with the saved values.
 402  */
 403 static int
 404 findbase_cb( Operation *op, SlapReply *rs )
 405 {
 406         slap_callback *sc = op->o_callback;
 407
 408         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 409                 fbase_cookie *fc = sc->sc_private;
 410
 411                 /* If no entryID, we're looking for the first time.
 412                  * Just store whatever we got.
 413                  */
 414                 if ( fc->fss->s_eid == NOID ) {
 415                         fc->fbase = 2;
 416                         fc->fss->s_eid = rs->sr_entry->e_id;
 417                         ber_dupbv( &fc->fss->s_base, &rs->sr_entry->e_nname );
 418
 419                 } else if ( rs->sr_entry->e_id == fc->fss->s_eid &&
 420                         dn_match( &rs->sr_entry->e_nname, &fc->fss->s_base )) {
 421
 422                 /* OK, the DN is the same and the entryID is the same. */
 423                         fc->fbase = 1;
 424                 }
 425         }
 426         if ( rs->sr_err != LDAP_SUCCESS ) {
 427                 Debug( LDAP_DEBUG_ANY, "findbase failed! %d\n", rs->sr_err,0,0 );
 428         }
 429         return LDAP_SUCCESS;
 430 }
 431
 432 static Filter generic_filter = { LDAP_FILTER_PRESENT, { 0 }, NULL };
 433 static struct berval generic_filterstr = BER_BVC("(objectclass=*)");
 434
 435 static int
 436 syncprov_findbase( Operation *op, fbase_cookie *fc )
 437 {
 438         /* Use basic parameters from syncrepl search, but use
 439          * current op's threadctx / tmpmemctx
 440          */
 441         ldap_pvt_thread_mutex_lock( &fc->fss->s_mutex );
 442         if ( fc->fss->s_flags & PS_FIND_BASE ) {
 443                 slap_callback cb = {0};
 444                 Operation fop;
 445                 SlapReply frs = { REP_RESULT };
 446                 int rc;
 447
 448                 fc->fss->s_flags ^= PS_FIND_BASE;
 449                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 450
 451                 fop = *fc->fss->s_op;
 452
 453                 fop.o_bd = fop.o_bd->bd_self;
 454                 fop.o_hdr = op->o_hdr;
 455                 fop.o_time = op->o_time;
 456                 fop.o_tincr = op->o_tincr;
 457                 fop.o_extra = op->o_extra;
 458
 459                 cb.sc_response = findbase_cb;
 460                 cb.sc_private = fc;
 461
 462                 fop.o_sync_mode = 0;    /* turn off sync mode */
 463                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 464                 fop.o_callback = &cb;
 465                 fop.o_tag = LDAP_REQ_SEARCH;
 466                 fop.ors_scope = LDAP_SCOPE_BASE;
 467                 fop.ors_limit = NULL;
 468                 fop.ors_slimit = 1;
 469                 fop.ors_tlimit = SLAP_NO_LIMIT;
 470                 fop.ors_attrs = slap_anlist_no_attrs;
 471                 fop.ors_attrsonly = 1;
 472                 fop.ors_filter = &generic_filter;
 473                 fop.ors_filterstr = generic_filterstr;
 474
 475                 rc = fop.o_bd->be_search( &fop, &frs );
 476         } else {
 477                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 478                 fc->fbase = 1;
 479         }
 480
 481         /* After the first call, see if the fdn resides in the scope */
 482         if ( fc->fbase == 1 ) {
 483                 switch ( fc->fss->s_op->ors_scope ) {
 484                 case LDAP_SCOPE_BASE:
 485                         fc->fscope = dn_match( fc->fdn, &fc->fss->s_base );
 486                         break;
 487                 case LDAP_SCOPE_ONELEVEL: {
 488                         struct berval pdn;
 489                         dnParent( fc->fdn, &pdn );
 490                         fc->fscope = dn_match( &pdn, &fc->fss->s_base );
 491                         break; }
 492                 case LDAP_SCOPE_SUBTREE:
 493                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base );
 494                         break;
 495                 case LDAP_SCOPE_SUBORDINATE:
 496                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base ) &&
 497                                 !dn_match( fc->fdn, &fc->fss->s_base );
 498                         break;
 499                 }
 500         }
 501
 502         if ( fc->fbase )
 503                 return LDAP_SUCCESS;
 504
 505         /* If entryID has changed, then the base of this search has
 506          * changed. Invalidate the psearch.
 507          */
 508         return LDAP_NO_SUCH_OBJECT;
 509 }
 510
 511 /* syncprov_findcsn:
 512  *   This function has three different purposes, but they all use a search
 513  * that filters on entryCSN so they're combined here.
 514  * 1: at startup time, after a contextCSN has been read from the database,
 515  * we search for all entries with CSN >= contextCSN in case the contextCSN
 516  * was not checkpointed at the previous shutdown.
 517  *
 518  * 2: when the current contextCSN is known and we have a sync cookie, we search
 519  * for one entry with CSN = the cookie CSN. If not found, try <= cookie CSN.
 520  * If an entry is found, the cookie CSN is valid, otherwise it is stale.
 521  *
 522  * 3: during a refresh phase, we search for all entries with CSN <= the cookie
 523  * CSN, and generate Present records for them. We always collect this result
 524  * in SyncID sets, even if there's only one match.
 525  */
 526 typedef enum find_csn_t {
 527         FIND_MAXCSN     = 1,
 528         FIND_CSN        = 2,
 529         FIND_PRESENT    = 3
 530 } find_csn_t;
 531
 532 static int
 533 findmax_cb( Operation *op, SlapReply *rs )
 534 {
 535         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 536                 struct berval *maxcsn = op->o_callback->sc_private;
 537                 Attribute *a = attr_find( rs->sr_entry->e_attrs,
 538                         slap_schema.si_ad_entryCSN );
 539
 540                 if ( a && ber_bvcmp( &a->a_vals[0], maxcsn ) > 0 &&
 541                         slap_parse_csn_sid( &a->a_vals[0] ) == slap_serverID ) {
 542                         maxcsn->bv_len = a->a_vals[0].bv_len;
 543                         strcpy( maxcsn->bv_val, a->a_vals[0].bv_val );
 544                 }
 545         }
 546         return LDAP_SUCCESS;
 547 }
 548
 549 static int
 550 findcsn_cb( Operation *op, SlapReply *rs )
 551 {
 552         slap_callback *sc = op->o_callback;
 553
 554         /* We just want to know that at least one exists, so it's OK if
 555          * we exceed the unchecked limit.
 556          */
 557         if ( rs->sr_err == LDAP_ADMINLIMIT_EXCEEDED ||
 558                 (rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS )) {
 559                 sc->sc_private = (void *)1;
 560         }
 561         return LDAP_SUCCESS;
 562 }
 563
 564 /* Build a list of entryUUIDs for sending in a SyncID set */
 565
 566 #define UUID_LEN        16
 567
 568 typedef struct fpres_cookie {
 569         int num;
 570         BerVarray uuids;
 571         char *last;
 572 } fpres_cookie;
 573
 574 static int
 575 findpres_cb( Operation *op, SlapReply *rs )
 576 {
 577         slap_callback *sc = op->o_callback;
 578         fpres_cookie *pc = sc->sc_private;
 579         Attribute *a;
 580         int ret = SLAP_CB_CONTINUE;
 581
 582         switch ( rs->sr_type ) {
 583         case REP_SEARCH:
 584                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryUUID );
 585                 if ( a ) {
 586                         pc->uuids[pc->num].bv_val = pc->last;
 587                         AC_MEMCPY( pc->uuids[pc->num].bv_val, a->a_nvals[0].bv_val,
 588                                 pc->uuids[pc->num].bv_len );
 589                         pc->num++;
 590                         pc->last = pc->uuids[pc->num].bv_val;
 591                         pc->uuids[pc->num].bv_val = NULL;
 592                 }
 593                 ret = LDAP_SUCCESS;
 594                 if ( pc->num != SLAP_SYNCUUID_SET_SIZE )
 595                         break;
 596                 /* FALLTHRU */
 597         case REP_RESULT:
 598                 ret = rs->sr_err;
 599                 if ( pc->num ) {
 600                         ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 601                                 0, pc->uuids, 0 );
 602                         pc->uuids[pc->num].bv_val = pc->last;
 603                         pc->num = 0;
 604                         pc->last = pc->uuids[0].bv_val;
 605                 }
 606                 break;
 607         default:
 608                 break;
 609         }
 610         return ret;
 611 }
 612
 613 static int
 614 syncprov_findcsn( Operation *op, find_csn_t mode, struct berval *csn )
 615 {
 616         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 617         syncprov_info_t         *si = on->on_bi.bi_private;
 618
 619         slap_callback cb = {0};
 620         Operation fop;
 621         SlapReply frs = { REP_RESULT };
 622         char buf[LDAP_PVT_CSNSTR_BUFSIZE + STRLENOF("(entryCSN<=)")];
 623         char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
 624         struct berval maxcsn;
 625         Filter cf;
 626         AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
 627         fpres_cookie pcookie;
 628         sync_control *srs = NULL;
 629         struct slap_limits_set fc_limits;
 630         int i, rc = LDAP_SUCCESS, findcsn_retry = 1;
 631         int maxid;
 632
 633         if ( mode != FIND_MAXCSN ) {
 634                 srs = op->o_controls[slap_cids.sc_LDAPsync];
 635         }
 636
 637         fop = *op;
 638         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync_mode */
 639         /* We want pure entries, not referrals */
 640         fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 641
 642         cf.f_ava = &eq;
 643         cf.f_av_desc = slap_schema.si_ad_entryCSN;
 644         BER_BVZERO( &cf.f_av_value );
 645         cf.f_next = NULL;
 646
 647         fop.o_callback = &cb;
 648         fop.ors_limit = NULL;
 649         fop.ors_tlimit = SLAP_NO_LIMIT;
 650         fop.ors_filter = &cf;
 651         fop.ors_filterstr.bv_val = buf;
 652
 653 again:
 654         switch( mode ) {
 655         case FIND_MAXCSN:
 656                 cf.f_choice = LDAP_FILTER_GE;
 657                 /* If there are multiple CSNs, use the one with our serverID */
 658                 for ( i=0; i<si->si_numcsns; i++) {
 659                         if ( slap_serverID == si->si_sids[i] ) {
 660                                 maxid = i;
 661                                 break;
 662                         }
 663                 }
 664                 if ( i == si->si_numcsns ) {
 665                         /* No match: this is multimaster, and none of the content in the DB
 666                          * originated locally. Treat like no CSN.
 667                          */
 668                         return LDAP_NO_SUCH_OBJECT;
 669                 }
 670                 cf.f_av_value = si->si_ctxcsn[maxid];
 671                 fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 672                         "(entryCSN>=%s)", cf.f_av_value.bv_val );
 673                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 674                         return LDAP_OTHER;
 675                 }
 676                 fop.ors_attrsonly = 0;
 677                 fop.ors_attrs = csn_anlist;
 678                 fop.ors_slimit = SLAP_NO_LIMIT;
 679                 cb.sc_private = &maxcsn;
 680                 cb.sc_response = findmax_cb;
 681                 strcpy( cbuf, cf.f_av_value.bv_val );
 682                 maxcsn.bv_val = cbuf;
 683                 maxcsn.bv_len = cf.f_av_value.bv_len;
 684                 break;
 685         case FIND_CSN:
 686                 if ( BER_BVISEMPTY( &cf.f_av_value )) {
 687                         cf.f_av_value = *csn;
 688                 }
 689                 fop.o_dn = op->o_bd->be_rootdn;
 690                 fop.o_ndn = op->o_bd->be_rootndn;
 691                 fop.o_req_dn = op->o_bd->be_suffix[0];
 692                 fop.o_req_ndn = op->o_bd->be_nsuffix[0];
 693                 /* Look for exact match the first time */
 694                 if ( findcsn_retry ) {
 695                         cf.f_choice = LDAP_FILTER_EQUALITY;
 696                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 697                                 "(entryCSN=%s)", cf.f_av_value.bv_val );
 698                 /* On retry, look for <= */
 699                 } else {
 700                         cf.f_choice = LDAP_FILTER_LE;
 701                         fop.ors_limit = &fc_limits;
 702                         memset( &fc_limits, 0, sizeof( fc_limits ));
 703                         fc_limits.lms_s_unchecked = 1;
 704                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 705                                 "(entryCSN<=%s)", cf.f_av_value.bv_val );
 706                 }
 707                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 708                         return LDAP_OTHER;
 709                 }
 710                 fop.ors_attrsonly = 1;
 711                 fop.ors_attrs = slap_anlist_no_attrs;
 712                 fop.ors_slimit = 1;
 713                 cb.sc_private = NULL;
 714                 cb.sc_response = findcsn_cb;
 715                 break;
 716         case FIND_PRESENT:
 717                 fop.ors_filter = op->ors_filter;
 718                 fop.ors_filterstr = op->ors_filterstr;
 719                 fop.ors_attrsonly = 0;
 720                 fop.ors_attrs = uuid_anlist;
 721                 fop.ors_slimit = SLAP_NO_LIMIT;
 722                 cb.sc_private = &pcookie;
 723                 cb.sc_response = findpres_cb;
 724                 pcookie.num = 0;
 725
 726                 /* preallocate storage for a full set */
 727                 pcookie.uuids = op->o_tmpalloc( (SLAP_SYNCUUID_SET_SIZE+1) *
 728                         sizeof(struct berval) + SLAP_SYNCUUID_SET_SIZE * UUID_LEN,
 729                         op->o_tmpmemctx );
 730                 pcookie.last = (char *)(pcookie.uuids + SLAP_SYNCUUID_SET_SIZE+1);
 731                 pcookie.uuids[0].bv_val = pcookie.last;
 732                 pcookie.uuids[0].bv_len = UUID_LEN;
 733                 for (i=1; i<SLAP_SYNCUUID_SET_SIZE; i++) {
 734                         pcookie.uuids[i].bv_val = pcookie.uuids[i-1].bv_val + UUID_LEN;
 735                         pcookie.uuids[i].bv_len = UUID_LEN;
 736                 }
 737                 break;
 738         }
 739
 740         fop.o_bd->bd_info = (BackendInfo *)on->on_info;
 741         fop.o_bd->be_search( &fop, &frs );
 742         fop.o_bd->bd_info = (BackendInfo *)on;
 743
 744         switch( mode ) {
 745         case FIND_MAXCSN:
 746                 if ( ber_bvcmp( &si->si_ctxcsn[maxid], &maxcsn )) {
 747 #ifdef CHECK_CSN
 748                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
 749                         assert( !syn->ssyn_validate( syn, &maxcsn ));
 750 #endif
 751                         ber_bvreplace( &si->si_ctxcsn[maxid], &maxcsn );
 752                         si->si_numops++;        /* ensure a checkpoint */
 753                 }
 754                 break;
 755         case FIND_CSN:
 756                 /* If matching CSN was not found, invalidate the context. */
 757                 if ( !cb.sc_private ) {
 758                         /* If we didn't find an exact match, then try for <= */
 759                         if ( findcsn_retry ) {
 760                                 findcsn_retry = 0;
 761                                 rs_reinit( &frs, REP_RESULT );
 762                                 goto again;
 763                         }
 764                         rc = LDAP_NO_SUCH_OBJECT;
 765                 }
 766                 break;
 767         case FIND_PRESENT:
 768                 op->o_tmpfree( pcookie.uuids, op->o_tmpmemctx );
 769                 break;
 770         }
 771
 772         return rc;
 773 }
 774
 775 static void free_resinfo( syncres *sr )
 776 {
 777         syncres **st;
 778         int freeit = 0;
 779         ldap_pvt_thread_mutex_lock( &sr->s_info->ri_mutex );
 780         for (st = &sr->s_info->ri_list; *st; st = &(*st)->s_rilist) {
 781                 if (*st == sr) {
 782                         *st = sr->s_rilist;
 783                         break;
 784                 }
 785         }
 786         if ( !sr->s_info->ri_list )
 787                 freeit = 1;
 788         ldap_pvt_thread_mutex_unlock( &sr->s_info->ri_mutex );
 789         if ( freeit ) {
 790                 ldap_pvt_thread_mutex_destroy( &sr->s_info->ri_mutex );
 791                 if ( sr->s_info->ri_e )
 792                         entry_free( sr->s_info->ri_e );
 793                 if ( !BER_BVISNULL( &sr->s_info->ri_cookie ))
 794                         ch_free( sr->s_info->ri_cookie.bv_val );
 795                 ch_free( sr->s_info );
 796         }
 797 }
 798
 799 #define FS_UNLINK       1
 800 #define FS_LOCK         2
 801
 802 static int
 803 syncprov_free_syncop( syncops *so, int flags )
 804 {
 805         syncres *sr, *srnext;
 806         GroupAssertion *ga, *gnext;
 807
 808         if ( flags & FS_LOCK )
 809                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 810         /* already being freed, or still in use */
 811         if ( !so->s_inuse || --so->s_inuse > 0 ) {
 812                 if ( flags & FS_LOCK )
 813                         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 814                 return 0;
 815         }
 816         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 817         if (( flags & FS_UNLINK ) && so->s_si ) {
 818                 syncops **sop;
 819                 ldap_pvt_thread_mutex_lock( &so->s_si->si_ops_mutex );
 820                 for ( sop = &so->s_si->si_ops; *sop; sop = &(*sop)->s_next ) {
 821                         if ( *sop == so ) {
 822                                 *sop = so->s_next;
 823                                 break;
 824                         }
 825                 }
 826                 ldap_pvt_thread_mutex_unlock( &so->s_si->si_ops_mutex );
 827         }
 828         if ( so->s_flags & PS_IS_DETACHED ) {
 829                 filter_free( so->s_op->ors_filter );
 830                 for ( ga = so->s_op->o_groups; ga; ga=gnext ) {
 831                         gnext = ga->ga_next;
 832                         ch_free( ga );
 833                 }
 834                 ch_free( so->s_op );
 835         }
 836         ch_free( so->s_base.bv_val );
 837         for ( sr=so->s_res; sr; sr=srnext ) {
 838                 srnext = sr->s_next;
 839                 free_resinfo( sr );
 840                 ch_free( sr );
 841         }
 842         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 843         ch_free( so );
 844         return 1;
 845 }
 846
 847 /* Send a persistent search response */
 848 static int
 849 syncprov_sendresp( Operation *op, resinfo *ri, syncops *so, int mode )
 850 {
 851         SlapReply rs = { REP_SEARCH };
 852         struct berval cookie, csns[2];
 853         Entry e_uuid = {0};
 854         Attribute a_uuid = {0};
 855
 856         if ( so->s_op->o_abandon )
 857                 return SLAPD_ABANDON;
 858
 859         rs.sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2, op->o_tmpmemctx );
 860         rs.sr_ctrls[1] = NULL;
 861         rs.sr_flags = REP_CTRLS_MUSTBEFREED;
 862         csns[0] = ri->ri_csn;
 863         BER_BVZERO( &csns[1] );
 864         slap_compose_sync_cookie( op, &cookie, csns, so->s_rid, slap_serverID ? slap_serverID : -1 );
 865
 866 #ifdef LDAP_DEBUG
 867         if ( so->s_sid > 0 ) {
 868                 Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: to=%03x, cookie=%s\n",
 869                         so->s_sid, cookie.bv_val, 0 );
 870         } else {
 871                 Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: cookie=%s\n",
 872                         cookie.bv_val, 0, 0 );
 873         }
 874 #endif
 875
 876         e_uuid.e_attrs = &a_uuid;
 877         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 878         a_uuid.a_nvals = &ri->ri_uuid;
 879         rs.sr_err = syncprov_state_ctrl( op, &rs, &e_uuid,
 880                 mode, rs.sr_ctrls, 0, 1, &cookie );
 881         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
 882
 883         rs.sr_entry = &e_uuid;
 884         if ( mode == LDAP_SYNC_ADD || mode == LDAP_SYNC_MODIFY ) {
 885                 e_uuid = *ri->ri_e;
 886                 e_uuid.e_private = NULL;
 887         }
 888
 889         switch( mode ) {
 890         case LDAP_SYNC_ADD:
 891                 if ( ri->ri_isref && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 892                         rs.sr_ref = get_entry_referrals( op, rs.sr_entry );
 893                         rs.sr_err = send_search_reference( op, &rs );
 894                         ber_bvarray_free( rs.sr_ref );
 895                         break;
 896                 }
 897                 /* fallthru */
 898         case LDAP_SYNC_MODIFY:
 899                 rs.sr_attrs = op->ors_attrs;
 900                 rs.sr_err = send_search_entry( op, &rs );
 901                 break;
 902         case LDAP_SYNC_DELETE:
 903                 e_uuid.e_attrs = NULL;
 904                 e_uuid.e_name = ri->ri_dn;
 905                 e_uuid.e_nname = ri->ri_ndn;
 906                 if ( ri->ri_isref && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 907                         struct berval bv = BER_BVNULL;
 908                         rs.sr_ref = &bv;
 909                         rs.sr_err = send_search_reference( op, &rs );
 910                 } else {
 911                         rs.sr_err = send_search_entry( op, &rs );
 912                 }
 913                 break;
 914         default:
 915                 assert(0);
 916         }
 917         return rs.sr_err;
 918 }
 919
 920 static void
 921 syncprov_qstart( syncops *so );
 922
 923 /* Play back queued responses */
 924 static int
 925 syncprov_qplay( Operation *op, syncops *so )
 926 {
 927         syncres *sr;
 928         int rc = 0;
 929
 930         do {
 931                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 932                 sr = so->s_res;
 933                 /* Exit loop with mutex held */
 934                 if ( !sr )
 935                         break;
 936                 so->s_res = sr->s_next;
 937                 if ( !so->s_res )
 938                         so->s_restail = NULL;
 939                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 940
 941                 if ( !so->s_op->o_abandon ) {
 942
 943                         if ( sr->s_mode == LDAP_SYNC_NEW_COOKIE ) {
 944                                 SlapReply rs = { REP_INTERMEDIATE };
 945
 946                                 rc = syncprov_sendinfo( op, &rs, LDAP_TAG_SYNC_NEW_COOKIE,
 947                                         &sr->s_info->ri_cookie, 0, NULL, 0 );
 948                         } else {
 949                                 rc = syncprov_sendresp( op, sr->s_info, so, sr->s_mode );
 950                         }
 951                 }
 952
 953                 free_resinfo( sr );
 954                 ch_free( sr );
 955
 956                 if ( so->s_op->o_abandon )
 957                         continue;
 958
 959                 /* Exit loop with mutex held */
 960                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 961                 break;
 962
 963         } while (1);
 964
 965         /* We now only send one change at a time, to prevent one
 966          * psearch from hogging all the CPU. Resubmit this task if
 967          * there are more responses queued and no errors occurred.
 968          */
 969
 970         if ( rc == 0 && so->s_res ) {
 971                 syncprov_qstart( so );
 972         }
 973
 974         return rc;
 975 }
 976
 977 /* task for playing back queued responses */
 978 static void *
 979 syncprov_qtask( void *ctx, void *arg )
 980 {
 981         syncops *so = arg;
 982         OperationBuffer opbuf;
 983         Operation *op;
 984         BackendDB be;
 985         int rc;
 986
 987         op = &opbuf.ob_op;
 988         *op = *so->s_op;
 989         op->o_hdr = &opbuf.ob_hdr;
 990         op->o_controls = opbuf.ob_controls;
 991         memset( op->o_controls, 0, sizeof(opbuf.ob_controls) );
 992         op->o_sync = SLAP_CONTROL_IGNORED;
 993
 994         *op->o_hdr = *so->s_op->o_hdr;
 995
 996         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx, 1);
 997         op->o_tmpmfuncs = &slap_sl_mfuncs;
 998         op->o_threadctx = ctx;
 999
1000         /* syncprov_qplay expects a fake db */
1001         be = *so->s_op->o_bd;
1002         be.be_flags |= SLAP_DBFLAG_OVERLAY;
1003         op->o_bd = &be;
1004         LDAP_SLIST_FIRST(&op->o_extra) = NULL;
1005         op->o_callback = NULL;
1006
1007         rc = syncprov_qplay( op, so );
1008
1009         /* if an error occurred, or no responses left, task is no longer queued */
1010         if ( !rc && !so->s_res )
1011                 rc = 1;
1012
1013         /* decrement use count... */
1014         if ( !syncprov_free_syncop( so, FS_UNLINK )) {
1015                 if ( rc )
1016                         /* if we didn't unlink, and task is no longer queued, clear flag */
1017                         so->s_flags ^= PS_TASK_QUEUED;
1018                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
1019         }
1020
1021         return NULL;
1022 }
1023
1024 /* Start the task to play back queued psearch responses */
1025 static void
1026 syncprov_qstart( syncops *so )
1027 {
1028         so->s_flags |= PS_TASK_QUEUED;
1029         so->s_inuse++;
1030         ldap_pvt_thread_pool_submit2( &connection_pool,
1031                 syncprov_qtask, so, &so->s_pool_cookie );
1032 }
1033
1034 /* Queue a persistent search response */
1035 static int
1036 syncprov_qresp( opcookie *opc, syncops *so, int mode )
1037 {
1038         syncres *sr;
1039         resinfo *ri;
1040         int srsize;
1041         struct berval csn = opc->sctxcsn;
1042
1043         sr = ch_malloc( sizeof( syncres ));
1044         sr->s_next = NULL;
1045         sr->s_mode = mode;
1046         if ( !opc->ssres.s_info ) {
1047
1048                 srsize = sizeof( resinfo );
1049                 if ( csn.bv_len )
1050                         srsize += csn.bv_len + 1;
1051
1052                 if ( opc->se ) {
1053                         Attribute *a;
1054                         ri = ch_malloc( srsize );
1055                         ri->ri_dn = opc->se->e_name;
1056                         ri->ri_ndn = opc->se->e_nname;
1057                         a = attr_find( opc->se->e_attrs, slap_schema.si_ad_entryUUID );
1058                         if ( a )
1059                                 ri->ri_uuid = a->a_nvals[0];
1060                         else
1061                                 ri->ri_uuid.bv_len = 0;
1062                         if ( csn.bv_len ) {
1063                                 ri->ri_csn.bv_val = (char *)(ri + 1);
1064                                 ri->ri_csn.bv_len = csn.bv_len;
1065                                 memcpy( ri->ri_csn.bv_val, csn.bv_val, csn.bv_len );
1066                                 ri->ri_csn.bv_val[csn.bv_len] = '\0';
1067                         } else {
1068                                 ri->ri_csn.bv_val = NULL;
1069                         }
1070                 } else {
1071                         srsize += opc->suuid.bv_len +
1072                                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1;
1073                         ri = ch_malloc( srsize );
1074                         ri->ri_dn.bv_val = (char *)(ri + 1);
1075                         ri->ri_dn.bv_len = opc->sdn.bv_len;
1076                         ri->ri_ndn.bv_val = lutil_strcopy( ri->ri_dn.bv_val,
1077                                 opc->sdn.bv_val ) + 1;
1078                         ri->ri_ndn.bv_len = opc->sndn.bv_len;
1079                         ri->ri_uuid.bv_val = lutil_strcopy( ri->ri_ndn.bv_val,
1080                                 opc->sndn.bv_val ) + 1;
1081                         ri->ri_uuid.bv_len = opc->suuid.bv_len;
1082                         AC_MEMCPY( ri->ri_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1083                         if ( csn.bv_len ) {
1084                                 ri->ri_csn.bv_val = ri->ri_uuid.bv_val + ri->ri_uuid.bv_len;
1085                                 memcpy( ri->ri_csn.bv_val, csn.bv_val, csn.bv_len );
1086                                 ri->ri_csn.bv_val[csn.bv_len] = '\0';
1087                         } else {
1088                                 ri->ri_csn.bv_val = NULL;
1089                         }
1090                 }
1091                 ri->ri_list = &opc->ssres;
1092                 ri->ri_e = opc->se;
1093                 ri->ri_csn.bv_len = csn.bv_len;
1094                 ri->ri_isref = opc->sreference;
1095                 BER_BVZERO( &ri->ri_cookie );
1096                 ldap_pvt_thread_mutex_init( &ri->ri_mutex );
1097                 opc->se = NULL;
1098                 opc->ssres.s_info = ri;
1099         }
1100         ri = opc->ssres.s_info;
1101         sr->s_info = ri;
1102         ldap_pvt_thread_mutex_lock( &ri->ri_mutex );
1103         sr->s_rilist = ri->ri_list;
1104         ri->ri_list = sr;
1105         if ( mode == LDAP_SYNC_NEW_COOKIE && BER_BVISNULL( &ri->ri_cookie )) {
1106                 syncprov_info_t *si = opc->son->on_bi.bi_private;
1107
1108                 slap_compose_sync_cookie( NULL, &ri->ri_cookie, si->si_ctxcsn,
1109                         so->s_rid, slap_serverID ? slap_serverID : -1);
1110         }
1111         ldap_pvt_thread_mutex_unlock( &ri->ri_mutex );
1112
1113         ldap_pvt_thread_mutex_lock( &so->s_mutex );
1114         if ( !so->s_res ) {
1115                 so->s_res = sr;
1116         } else {
1117                 so->s_restail->s_next = sr;
1118         }
1119         so->s_restail = sr;
1120
1121         /* If the base of the psearch was modified, check it next time round */
1122         if ( so->s_flags & PS_WROTE_BASE ) {
1123                 so->s_flags ^= PS_WROTE_BASE;
1124                 so->s_flags |= PS_FIND_BASE;
1125         }
1126         if (( so->s_flags & (PS_IS_DETACHED|PS_TASK_QUEUED)) == PS_IS_DETACHED ) {
1127                 syncprov_qstart( so );
1128         }
1129         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
1130         return LDAP_SUCCESS;
1131 }
1132
1133 static int
1134 syncprov_drop_psearch( syncops *so, int lock )
1135 {
1136         if ( so->s_flags & PS_IS_DETACHED ) {
1137                 if ( lock )
1138                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
1139                 so->s_op->o_conn->c_n_ops_executing--;
1140                 so->s_op->o_conn->c_n_ops_completed++;
1141                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, Operation,
1142                         o_next );
1143                 if ( lock )
1144                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
1145         }
1146         return syncprov_free_syncop( so, FS_LOCK );
1147 }
1148
1149 static int
1150 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
1151 {
1152         slap_callback *sc = op->o_callback;
1153         op->o_callback = sc->sc_next;
1154         syncprov_drop_psearch( sc->sc_private, 0 );
1155         op->o_tmpfree( sc, op->o_tmpmemctx );
1156         return 0;
1157 }
1158
1159 static int
1160 syncprov_op_abandon( Operation *op, SlapReply *rs )
1161 {
1162         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1163         syncprov_info_t         *si = on->on_bi.bi_private;
1164         syncops *so, **sop;
1165
1166         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1167         for ( sop=&si->si_ops; (so = *sop); sop = &(*sop)->s_next ) {
1168                 if ( so->s_op->o_connid == op->o_connid &&
1169                         so->s_op->o_msgid == op->orn_msgid ) {
1170                                 so->s_op->o_abandon = 1;
1171                                 *sop = so->s_next;
1172                                 break;
1173                 }
1174         }
1175         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1176         if ( so ) {
1177                 /* Is this really a Cancel exop? */
1178                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
1179                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
1180                         rs->sr_err = LDAP_CANCELLED;
1181                         send_ldap_result( so->s_op, rs );
1182                         if ( so->s_flags & PS_IS_DETACHED ) {
1183                                 slap_callback *cb;
1184                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
1185                                 cb->sc_cleanup = syncprov_ab_cleanup;
1186                                 cb->sc_next = op->o_callback;
1187                                 cb->sc_private = so;
1188                                 op->o_callback = cb;
1189                                 return SLAP_CB_CONTINUE;
1190                         }
1191                 }
1192                 syncprov_drop_psearch( so, 0 );
1193         }
1194         return SLAP_CB_CONTINUE;
1195 }
1196
1197 /* Find which persistent searches are affected by this operation */
1198 static void
1199 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
1200 {
1201         slap_overinst *on = opc->son;
1202         syncprov_info_t         *si = on->on_bi.bi_private;
1203
1204         fbase_cookie fc;
1205         syncops **pss;
1206         Entry *e = NULL;
1207         Attribute *a;
1208         int rc, gonext;
1209         struct berval newdn;
1210         int freefdn = 0;
1211         BackendDB *b0 = op->o_bd, db;
1212
1213         fc.fdn = &op->o_req_ndn;
1214         /* compute new DN */
1215         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1216                 struct berval pdn;
1217                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
1218                 else dnParent( fc.fdn, &pdn );
1219                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
1220                 fc.fdn = &newdn;
1221                 freefdn = 1;
1222         }
1223         if ( op->o_tag != LDAP_REQ_ADD ) {
1224                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1225                         db = *op->o_bd;
1226                         op->o_bd = &db;
1227                 }
1228                 rc = overlay_entry_get_ov( op, fc.fdn, NULL, NULL, 0, &e, on );
1229                 /* If we're sending responses now, make a copy and unlock the DB */
1230                 if ( e && !saveit ) {
1231                         if ( !opc->se )
1232                                 opc->se = entry_dup( e );
1233                         overlay_entry_release_ov( op, e, 0, on );
1234                         e = opc->se;
1235                 }
1236                 if ( rc ) {
1237                         op->o_bd = b0;
1238                         return;
1239                 }
1240         } else {
1241                 e = op->ora_e;
1242                 if ( !saveit ) {
1243                         if ( !opc->se )
1244                                 opc->se = entry_dup( e );
1245                         e = opc->se;
1246                 }
1247         }
1248
1249         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1250                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1251                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1252                 opc->sreference = is_entry_referral( e );
1253                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1254                 if ( a )
1255                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1256         } else if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1257                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1258                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1259                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1260                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1261         }
1262
1263         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1264         for (pss = &si->si_ops; *pss; pss = gonext ? &(*pss)->s_next : pss)
1265         {
1266                 Operation op2;
1267                 Opheader oh;
1268                 syncmatches *sm;
1269                 int found = 0;
1270                 syncops *snext, *ss = *pss;
1271
1272                 gonext = 1;
1273                 if ( ss->s_op->o_abandon )
1274                         continue;
1275
1276                 /* Don't send ops back to the originator */
1277                 if ( opc->osid > 0 && opc->osid == ss->s_sid ) {
1278                         Debug( LDAP_DEBUG_SYNC, "syncprov_matchops: skipping original sid %03x\n",
1279                                 opc->osid, 0, 0 );
1280                         continue;
1281                 }
1282
1283                 /* Don't send ops back to the messenger */
1284                 if ( opc->rsid > 0 && opc->rsid == ss->s_sid ) {
1285                         Debug( LDAP_DEBUG_SYNC, "syncprov_matchops: skipping relayed sid %03x\n",
1286                                 opc->rsid, 0, 0 );
1287                         continue;
1288                 }
1289
1290                 /* validate base */
1291                 fc.fss = ss;
1292                 fc.fbase = 0;
1293                 fc.fscope = 0;
1294
1295                 /* If the base of the search is missing, signal a refresh */
1296                 rc = syncprov_findbase( op, &fc );
1297                 if ( rc != LDAP_SUCCESS ) {
1298                         SlapReply rs = {REP_RESULT};
1299                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1300                                 "search base has changed" );
1301                         snext = ss->s_next;
1302                         if ( syncprov_drop_psearch( ss, 1 ) )
1303                                 *pss = snext;
1304                         gonext = 0;
1305                         continue;
1306                 }
1307
1308                 /* If we're sending results now, look for this op in old matches */
1309                 if ( !saveit ) {
1310                         syncmatches *old;
1311
1312                         /* Did we modify the search base? */
1313                         if ( dn_match( &op->o_req_ndn, &ss->s_base )) {
1314                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1315                                 ss->s_flags |= PS_WROTE_BASE;
1316                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1317                         }
1318
1319                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1320                                 old=sm, sm=sm->sm_next ) {
1321                                 if ( sm->sm_op == ss ) {
1322                                         found = 1;
1323                                         old->sm_next = sm->sm_next;
1324                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1325                                         break;
1326                                 }
1327                         }
1328                 }
1329
1330                 if ( fc.fscope ) {
1331                         ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1332                         op2 = *ss->s_op;
1333                         oh = *op->o_hdr;
1334                         oh.oh_conn = ss->s_op->o_conn;
1335                         oh.oh_connid = ss->s_op->o_connid;
1336                         op2.o_bd = op->o_bd->bd_self;
1337                         op2.o_hdr = &oh;
1338                         op2.o_extra = op->o_extra;
1339                         op2.o_callback = NULL;
1340                         if (ss->s_flags & PS_FIX_FILTER) {
1341                                 /* Skip the AND/GE clause that we stuck on in front. We
1342                                    would lose deletes/mods that happen during the refresh
1343                                    phase otherwise (ITS#6555) */
1344                                 op2.ors_filter = ss->s_op->ors_filter->f_and->f_next;
1345                         }
1346                         rc = test_filter( &op2, e, op2.ors_filter );
1347                         ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1348                 }
1349
1350                 Debug( LDAP_DEBUG_TRACE, "syncprov_matchops: sid %03x fscope %d rc %d\n",
1351                         ss->s_sid, fc.fscope, rc );
1352
1353                 /* check if current o_req_dn is in scope and matches filter */
1354                 if ( fc.fscope && rc == LDAP_COMPARE_TRUE ) {
1355                         if ( saveit ) {
1356                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1357                                 sm->sm_next = opc->smatches;
1358                                 sm->sm_op = ss;
1359                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1360                                 ++ss->s_inuse;
1361                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1362                                 opc->smatches = sm;
1363                         } else {
1364                                 /* if found send UPDATE else send ADD */
1365                                 syncprov_qresp( opc, ss,
1366                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD );
1367                         }
1368                 } else if ( !saveit && found ) {
1369                         /* send DELETE */
1370                         syncprov_qresp( opc, ss, LDAP_SYNC_DELETE );
1371                 } else if ( !saveit ) {
1372                         syncprov_qresp( opc, ss, LDAP_SYNC_NEW_COOKIE );
1373                 }
1374                 if ( !saveit && found ) {
1375                         /* Decrement s_inuse, was incremented when called
1376                          * with saveit == TRUE
1377                          */
1378                         snext = ss->s_next;
1379                         if ( syncprov_free_syncop( ss, FS_LOCK ) ) {
1380                                 *pss = snext;
1381                                 gonext = 0;
1382                         }
1383                 }
1384         }
1385         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1386
1387         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1388                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1389                         op->o_bd = &db;
1390                 }
1391                 if ( saveit )
1392                         overlay_entry_release_ov( op, e, 0, on );
1393                 op->o_bd = b0;
1394         }
1395         if ( !saveit ) {
1396                 if ( opc->ssres.s_info )
1397                         free_resinfo( &opc->ssres );
1398                 else if ( opc->se )
1399                         entry_free( opc->se );
1400         }
1401         if ( freefdn ) {
1402                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1403         }
1404         op->o_bd = b0;
1405 }
1406
1407 static int
1408 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1409 {
1410         slap_callback *cb = op->o_callback;
1411         opcookie *opc = cb->sc_private;
1412         slap_overinst *on = opc->son;
1413         syncprov_info_t         *si = on->on_bi.bi_private;
1414         syncmatches *sm, *snext;
1415         modtarget *mt;
1416
1417         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1418         if ( si->si_active )
1419                 si->si_active--;
1420         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1421
1422         for (sm = opc->smatches; sm; sm=snext) {
1423                 snext = sm->sm_next;
1424                 syncprov_free_syncop( sm->sm_op, FS_LOCK|FS_UNLINK );
1425                 op->o_tmpfree( sm, op->o_tmpmemctx );
1426         }
1427
1428         /* Remove op from lock table */
1429         mt = opc->smt;
1430         if ( mt ) {
1431                 modinst *mi = (modinst *)(opc+1), **m2;
1432                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1433                 for (m2 = &mt->mt_mods; ; m2 = &(*m2)->mi_next) {
1434                         if ( *m2 == mi ) {
1435                                 *m2 = mi->mi_next;
1436                                 if ( mt->mt_tail == mi )
1437                                         mt->mt_tail = ( m2 == &mt->mt_mods ) ? NULL : (modinst *)m2;
1438                                 break;
1439                         }
1440                 }
1441                 /* If there are more, promote the next one */
1442                 if ( mt->mt_mods ) {
1443                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1444                 } else {
1445                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1446                         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1447                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1448                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1449                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1450                         ch_free( mt->mt_dn.bv_val );
1451                         ch_free( mt );
1452                 }
1453         }
1454         if ( !BER_BVISNULL( &opc->suuid ))
1455                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1456         if ( !BER_BVISNULL( &opc->sndn ))
1457                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1458         if ( !BER_BVISNULL( &opc->sdn ))
1459                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1460         op->o_callback = cb->sc_next;
1461         op->o_tmpfree(cb, op->o_tmpmemctx);
1462
1463         return 0;
1464 }
1465
1466 static void
1467 syncprov_checkpoint( Operation *op, slap_overinst *on )
1468 {
1469         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
1470         Modifications mod;
1471         Operation opm;
1472         SlapReply rsm = {REP_RESULT};
1473         slap_callback cb = {0};
1474         BackendDB be;
1475         BackendInfo *bi;
1476
1477 #ifdef CHECK_CSN
1478         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1479
1480         int i;
1481         for ( i=0; i<si->si_numcsns; i++ ) {
1482                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1483         }
1484 #endif
1485         mod.sml_numvals = si->si_numcsns;
1486         mod.sml_values = si->si_ctxcsn;
1487         mod.sml_nvalues = NULL;
1488         mod.sml_desc = slap_schema.si_ad_contextCSN;
1489         mod.sml_op = LDAP_MOD_REPLACE;
1490         mod.sml_flags = SLAP_MOD_INTERNAL;
1491         mod.sml_next = NULL;
1492
1493         cb.sc_response = slap_null_cb;
1494         opm = *op;
1495         opm.o_tag = LDAP_REQ_MODIFY;
1496         opm.o_callback = &cb;
1497         opm.orm_modlist = &mod;
1498         opm.orm_no_opattrs = 1;
1499         if ( SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1500                 be = *on->on_info->oi_origdb;
1501                 opm.o_bd = &be;
1502         }
1503         opm.o_req_dn = si->si_contextdn;
1504         opm.o_req_ndn = si->si_contextdn;
1505         bi = opm.o_bd->bd_info;
1506         opm.o_bd->bd_info = on->on_info->oi_orig;
1507         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1508         opm.o_no_schema_check = 1;
1509         opm.o_dont_replicate = 1;
1510         opm.o_opid = -1;
1511         opm.o_bd->be_modify( &opm, &rsm );
1512
1513         if ( rsm.sr_err == LDAP_NO_SUCH_OBJECT &&
1514                 SLAP_SYNC_SUBENTRY( opm.o_bd )) {
1515                 const char      *text;
1516                 char txtbuf[SLAP_TEXT_BUFLEN];
1517                 size_t textlen = sizeof txtbuf;
1518                 Entry *e = slap_create_context_csn_entry( opm.o_bd, NULL );
1519                 rs_reinit( &rsm, REP_RESULT );
1520                 slap_mods2entry( &mod, &e, 0, 1, &text, txtbuf, textlen);
1521                 opm.ora_e = e;
1522                 opm.o_bd->be_add( &opm, &rsm );
1523                 if ( e == opm.ora_e )
1524                         be_entry_release_w( &opm, opm.ora_e );
1525         }
1526         opm.o_bd->bd_info = bi;
1527
1528         if ( mod.sml_next != NULL ) {
1529                 slap_mods_free( mod.sml_next, 1 );
1530         }
1531 #ifdef CHECK_CSN
1532         for ( i=0; i<si->si_numcsns; i++ ) {
1533                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1534         }
1535 #endif
1536 }
1537
1538 static void
1539 syncprov_add_slog( Operation *op )
1540 {
1541         opcookie *opc = op->o_callback->sc_private;
1542         slap_overinst *on = opc->son;
1543         syncprov_info_t         *si = on->on_bi.bi_private;
1544         sessionlog *sl;
1545         slog_entry *se;
1546
1547         sl = si->si_logs;
1548         {
1549                 if ( BER_BVISEMPTY( &op->o_csn ) ) {
1550                         /* During the syncrepl refresh phase we can receive operations
1551                          * without a csn.  We cannot reliably determine the consumers
1552                          * state with respect to such operations, so we ignore them and
1553                          * wipe out anything in the log if we see them.
1554                          */
1555                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1556                         /* can only do this if no one else is reading the log at the moment */
1557                         if (!sl->sl_playing) {
1558                         while ( se = sl->sl_head ) {
1559                                 sl->sl_head = se->se_next;
1560                                 ch_free( se );
1561                         }
1562                         sl->sl_tail = NULL;
1563                         sl->sl_num = 0;
1564                         }
1565                         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1566                         return;
1567                 }
1568
1569                 /* Allocate a record. UUIDs are not NUL-terminated. */
1570                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1571                         op->o_csn.bv_len + 1 );
1572                 se->se_next = NULL;
1573                 se->se_tag = op->o_tag;
1574
1575                 se->se_uuid.bv_val = (char *)(&se[1]);
1576                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1577                 se->se_uuid.bv_len = opc->suuid.bv_len;
1578
1579                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1580                 AC_MEMCPY( se->se_csn.bv_val, op->o_csn.bv_val, op->o_csn.bv_len );
1581                 se->se_csn.bv_val[op->o_csn.bv_len] = '\0';
1582                 se->se_csn.bv_len = op->o_csn.bv_len;
1583                 se->se_sid = slap_parse_csn_sid( &se->se_csn );
1584
1585                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1586                 if ( sl->sl_head ) {
1587                         /* Keep the list in csn order. */
1588                         if ( ber_bvcmp( &sl->sl_tail->se_csn, &se->se_csn ) <= 0 ) {
1589                                 sl->sl_tail->se_next = se;
1590                                 sl->sl_tail = se;
1591                         } else {
1592                                 slog_entry **sep;
1593
1594                                 for ( sep = &sl->sl_head; *sep; sep = &(*sep)->se_next ) {
1595                                         if ( ber_bvcmp( &se->se_csn, &(*sep)->se_csn ) < 0 ) {
1596                                                 se->se_next = *sep;
1597                                                 *sep = se;
1598                                                 break;
1599                                         }
1600                                 }
1601                         }
1602                 } else {
1603                         sl->sl_head = se;
1604                         sl->sl_tail = se;
1605                         if ( !sl->sl_mincsn ) {
1606                                 sl->sl_numcsns = 1;
1607                                 sl->sl_mincsn = ch_malloc( 2*sizeof( struct berval ));
1608                                 sl->sl_sids = ch_malloc( sizeof( int ));
1609                                 sl->sl_sids[0] = se->se_sid;
1610                                 ber_dupbv( sl->sl_mincsn, &se->se_csn );
1611                                 BER_BVZERO( &sl->sl_mincsn[1] );
1612                         }
1613                 }
1614                 sl->sl_num++;
1615                 if (!sl->sl_playing) {
1616                 while ( sl->sl_num > sl->sl_size ) {
1617                         int i;
1618                         se = sl->sl_head;
1619                         sl->sl_head = se->se_next;
1620                         for ( i=0; i<sl->sl_numcsns; i++ )
1621                                 if ( sl->sl_sids[i] >= se->se_sid )
1622                                         break;
1623                         if  ( i == sl->sl_numcsns || sl->sl_sids[i] != se->se_sid ) {
1624                                 slap_insert_csn_sids( (struct sync_cookie *)sl,
1625                                         i, se->se_sid, &se->se_csn );
1626                         } else {
1627                                 ber_bvreplace( &sl->sl_mincsn[i], &se->se_csn );
1628                         }
1629                         ch_free( se );
1630                         sl->sl_num--;
1631                 }
1632                 }
1633                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1634         }
1635 }
1636
1637 /* Just set a flag if we found the matching entry */
1638 static int
1639 playlog_cb( Operation *op, SlapReply *rs )
1640 {
1641         if ( rs->sr_type == REP_SEARCH ) {
1642                 op->o_callback->sc_private = (void *)1;
1643         }
1644         return rs->sr_err;
1645 }
1646
1647 /* enter with sl->sl_mutex locked, release before returning */
1648 static void
1649 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1650         sync_control *srs, BerVarray ctxcsn, int numcsns, int *sids )
1651 {
1652         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1653         slog_entry *se;
1654         int i, j, ndel, num, nmods, mmods;
1655         char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
1656         BerVarray uuids;
1657         struct berval delcsn[2];
1658
1659         if ( !sl->sl_num ) {
1660                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1661                 return;
1662         }
1663
1664         num = sl->sl_num;
1665         i = 0;
1666         nmods = 0;
1667         sl->sl_playing++;
1668         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1669
1670         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1671                 num * UUID_LEN, op->o_tmpmemctx );
1672         uuids[0].bv_val = (char *)(uuids + num + 1);
1673
1674         delcsn[0].bv_len = 0;
1675         delcsn[0].bv_val = cbuf;
1676         BER_BVZERO(&delcsn[1]);
1677
1678         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1679          * and everything else at the end. Do this first so we can
1680          * unlock the list mutex.
1681          */
1682         Debug( LDAP_DEBUG_SYNC, "srs csn %s\n",
1683                 srs->sr_state.ctxcsn[0].bv_val, 0, 0 );
1684         for ( se=sl->sl_head; se; se=se->se_next ) {
1685                 int k;
1686                 Debug( LDAP_DEBUG_SYNC, "log csn %s\n", se->se_csn.bv_val, 0, 0 );
1687                 ndel = 1;
1688                 for ( k=0; k<srs->sr_state.numcsns; k++ ) {
1689                         if ( se->se_sid == srs->sr_state.sids[k] ) {
1690                                 ndel = ber_bvcmp( &se->se_csn, &srs->sr_state.ctxcsn[k] );
1691                                 break;
1692                         }
1693                 }
1694                 if ( ndel <= 0 ) {
1695                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too old\n", ndel, 0, 0 );
1696                         continue;
1697                 }
1698                 ndel = 0;
1699                 for ( k=0; k<numcsns; k++ ) {
1700                         if ( se->se_sid == sids[k] ) {
1701                                 ndel = ber_bvcmp( &se->se_csn, &ctxcsn[k] );
1702                                 break;
1703                         }
1704                 }
1705                 if ( ndel > 0 ) {
1706                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too new\n", ndel, 0, 0 );
1707                         break;
1708                 }
1709                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1710                         j = i;
1711                         i++;
1712                         AC_MEMCPY( cbuf, se->se_csn.bv_val, se->se_csn.bv_len );
1713                         delcsn[0].bv_len = se->se_csn.bv_len;
1714                         delcsn[0].bv_val[delcsn[0].bv_len] = '\0';
1715                 } else {
1716                         if ( se->se_tag == LDAP_REQ_ADD )
1717                                 continue;
1718                         nmods++;
1719                         j = num - nmods;
1720                 }
1721                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1722                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1723                 uuids[j].bv_len = UUID_LEN;
1724         }
1725         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1726         sl->sl_playing--;
1727         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1728
1729         ndel = i;
1730
1731         /* Zero out unused slots */
1732         for ( i=ndel; i < num - nmods; i++ )
1733                 uuids[i].bv_len = 0;
1734
1735         /* Mods must be validated to see if they belong in this delete set.
1736          */
1737
1738         mmods = nmods;
1739         /* Strip any duplicates */
1740         for ( i=0; i<nmods; i++ ) {
1741                 for ( j=0; j<ndel; j++ ) {
1742                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1743                                 uuids[num - 1 - i].bv_len = 0;
1744                                 mmods --;
1745                                 break;
1746                         }
1747                 }
1748                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1749                 for ( j=0; j<i; j++ ) {
1750                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1751                                 uuids[num - 1 - i].bv_len = 0;
1752                                 mmods --;
1753                                 break;
1754                         }
1755                 }
1756         }
1757
1758         if ( mmods ) {
1759                 Operation fop;
1760                 int rc;
1761                 Filter mf, af;
1762                 AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
1763                 slap_callback cb = {0};
1764
1765                 fop = *op;
1766
1767                 fop.o_sync_mode = 0;
1768                 fop.o_callback = &cb;
1769                 fop.ors_limit = NULL;
1770                 fop.ors_tlimit = SLAP_NO_LIMIT;
1771                 fop.ors_attrs = slap_anlist_all_attributes;
1772                 fop.ors_attrsonly = 0;
1773                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1774
1775                 af.f_choice = LDAP_FILTER_AND;
1776                 af.f_next = NULL;
1777                 af.f_and = &mf;
1778                 mf.f_choice = LDAP_FILTER_EQUALITY;
1779                 mf.f_ava = &eq;
1780                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1781                 mf.f_next = fop.ors_filter;
1782
1783                 fop.ors_filter = &af;
1784
1785                 cb.sc_response = playlog_cb;
1786                 fop.o_bd->bd_info = (BackendInfo *)on->on_info;
1787
1788                 for ( i=ndel; i<num; i++ ) {
1789                   if ( uuids[i].bv_len != 0 ) {
1790                         SlapReply frs = { REP_RESULT };
1791
1792                         mf.f_av_value = uuids[i];
1793                         cb.sc_private = NULL;
1794                         fop.ors_slimit = 1;
1795                         rc = fop.o_bd->be_search( &fop, &frs );
1796
1797                         /* If entry was not found, add to delete list */
1798                         if ( !cb.sc_private ) {
1799                                 uuids[ndel++] = uuids[i];
1800                         }
1801                   }
1802                 }
1803                 fop.o_bd->bd_info = (BackendInfo *)on;
1804         }
1805         if ( ndel ) {
1806                 struct berval cookie;
1807
1808                 if ( delcsn[0].bv_len ) {
1809                         slap_compose_sync_cookie( op, &cookie, delcsn, srs->sr_state.rid,
1810                                 slap_serverID ? slap_serverID : -1 );
1811
1812                         Debug( LDAP_DEBUG_SYNC, "syncprov_playlog: cookie=%s\n", cookie.bv_val, 0, 0 );
1813                 }
1814
1815                 uuids[ndel].bv_val = NULL;
1816                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET,
1817                         delcsn[0].bv_len ? &cookie : NULL, 0, uuids, 1 );
1818                 if ( delcsn[0].bv_len ) {
1819                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1820                 }
1821         }
1822         op->o_tmpfree( uuids, op->o_tmpmemctx );
1823 }
1824
1825 static int
1826 syncprov_new_ctxcsn( opcookie *opc, syncprov_info_t *si, int csn_changed, int numvals, BerVarray vals )
1827 {
1828         unsigned i;
1829         int j, sid;
1830
1831         for ( i=0; i<numvals; i++ ) {
1832                 sid = slap_parse_csn_sid( &vals[i] );
1833                 for ( j=0; j<si->si_numcsns; j++ ) {
1834                         if ( sid < si->si_sids[j] )
1835                                 break;
1836                         if ( sid == si->si_sids[j] ) {
1837                                 if ( ber_bvcmp( &vals[i], &si->si_ctxcsn[j] ) > 0 ) {
1838                                         ber_bvreplace( &si->si_ctxcsn[j], &vals[i] );
1839                                         csn_changed = 1;
1840                                 }
1841                                 break;
1842                         }
1843                 }
1844
1845                 if ( j == si->si_numcsns || sid != si->si_sids[j] ) {
1846                         slap_insert_csn_sids( (struct sync_cookie *)&si->si_ctxcsn,
1847                                 j, sid, &vals[i] );
1848                         csn_changed = 1;
1849                 }
1850         }
1851         if ( csn_changed )
1852                 si->si_dirty = 0;
1853         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1854
1855         if ( csn_changed ) {
1856                 syncops *ss;
1857                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1858                 for ( ss = si->si_ops; ss; ss = ss->s_next ) {
1859                         if ( ss->s_op->o_abandon )
1860                                 continue;
1861                         /* Send the updated csn to all syncrepl consumers,
1862                          * including the server from which it originated.
1863                          * The syncrepl consumer and syncprov provider on
1864                          * the originating server may be configured to store
1865                          * their csn values in different entries.
1866                          */
1867                         syncprov_qresp( opc, ss, LDAP_SYNC_NEW_COOKIE );
1868                 }
1869                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1870         }
1871         return csn_changed;
1872 }
1873
1874 static int
1875 syncprov_op_response( Operation *op, SlapReply *rs )
1876 {
1877         opcookie *opc = op->o_callback->sc_private;
1878         slap_overinst *on = opc->son;
1879         syncprov_info_t         *si = on->on_bi.bi_private;
1880         syncmatches *sm;
1881
1882         if ( rs->sr_err == LDAP_SUCCESS )
1883         {
1884                 struct berval maxcsn;
1885                 char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
1886                 int do_check = 0, have_psearches, foundit, csn_changed = 0;
1887
1888                 ldap_pvt_thread_mutex_lock( &si->si_resp_mutex );
1889
1890                 /* Update our context CSN */
1891                 cbuf[0] = '\0';
1892                 maxcsn.bv_val = cbuf;
1893                 maxcsn.bv_len = sizeof(cbuf);
1894                 ldap_pvt_thread_rdwr_wlock( &si->si_csn_rwlock );
1895
1896                 slap_get_commit_csn( op, &maxcsn, &foundit );
1897                 if ( BER_BVISEMPTY( &maxcsn ) && SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1898                         /* syncrepl queues the CSN values in the db where
1899                          * it is configured , not where the changes are made.
1900                          * So look for a value in the glue db if we didn't
1901                          * find any in this db.
1902                          */
1903                         BackendDB *be = op->o_bd;
1904                         op->o_bd = select_backend( &be->be_nsuffix[0], 1);
1905                         maxcsn.bv_val = cbuf;
1906                         maxcsn.bv_len = sizeof(cbuf);
1907                         slap_get_commit_csn( op, &maxcsn, &foundit );
1908                         op->o_bd = be;
1909                 }
1910                 if ( !BER_BVISEMPTY( &maxcsn ) ) {
1911                         int i, sid;
1912 #ifdef CHECK_CSN
1913                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1914                         assert( !syn->ssyn_validate( syn, &maxcsn ));
1915 #endif
1916                         sid = slap_parse_csn_sid( &maxcsn );
1917                         for ( i=0; i<si->si_numcsns; i++ ) {
1918                                 if ( sid < si->si_sids[i] )
1919                                         break;
1920                                 if ( sid == si->si_sids[i] ) {
1921                                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn[i] ) > 0 ) {
1922                                                 ber_bvreplace( &si->si_ctxcsn[i], &maxcsn );
1923                                                 csn_changed = 1;
1924                                         }
1925                                         break;
1926                                 }
1927                         }
1928                         /* It's a new SID for us */
1929                         if ( i == si->si_numcsns || sid != si->si_sids[i] ) {
1930                                 slap_insert_csn_sids((struct sync_cookie *)&(si->si_ctxcsn),
1931                                         i, sid, &maxcsn );
1932                                 csn_changed = 1;
1933                         }
1934                 }
1935
1936                 /* Don't do any processing for consumer contextCSN updates */
1937                 if ( SLAPD_SYNC_IS_SYNCCONN( op->o_connid ) &&
1938                         op->o_tag == LDAP_REQ_MODIFY &&
1939                         op->orm_modlist &&
1940                         op->orm_modlist->sml_op == LDAP_MOD_REPLACE &&
1941                         op->orm_modlist->sml_desc == slap_schema.si_ad_contextCSN ) {
1942                         /* Catch contextCSN updates from syncrepl. We have to look at
1943                          * all the attribute values, as there may be more than one csn
1944                          * that changed, and only one can be passed in the csn queue.
1945                          */
1946                         csn_changed = syncprov_new_ctxcsn( opc, si, csn_changed,
1947                                 op->orm_modlist->sml_numvals, op->orm_modlist->sml_values );
1948                         if ( csn_changed )
1949                                 si->si_numops++;
1950                         goto leave;
1951                 }
1952                 if ( op->o_dont_replicate ) {
1953                         if ( csn_changed )
1954                                 si->si_numops++;
1955                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1956                         goto leave;
1957                 }
1958
1959                 /* If we're adding the context entry, parse all of its contextCSNs */
1960                 if ( op->o_tag == LDAP_REQ_ADD &&
1961                         dn_match( &op->o_req_ndn, &si->si_contextdn )) {
1962                         Attribute *a = attr_find( op->ora_e->e_attrs, slap_schema.si_ad_contextCSN );
1963                         if ( a ) {
1964                                 csn_changed = syncprov_new_ctxcsn( opc, si, csn_changed, a->a_numvals, a->a_vals );
1965                                 if ( csn_changed )
1966                                         si->si_numops++;
1967                                 goto added;
1968                         }
1969                 }
1970
1971                 if ( csn_changed )
1972                         si->si_numops++;
1973                 if ( si->si_chkops || si->si_chktime ) {
1974                         /* Never checkpoint adding the context entry,
1975                          * it will deadlock
1976                          */
1977                         if ( op->o_tag != LDAP_REQ_ADD ||
1978                                 !dn_match( &op->o_req_ndn, &si->si_contextdn )) {
1979                                 if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1980                                         do_check = 1;
1981                                         si->si_numops = 0;
1982                                 }
1983                                 if ( si->si_chktime &&
1984                                         (op->o_time - si->si_chklast >= si->si_chktime )) {
1985                                         if ( si->si_chklast ) {
1986                                                 do_check = 1;
1987                                                 si->si_chklast = op->o_time;
1988                                         } else {
1989                                                 si->si_chklast = 1;
1990                                         }
1991                                 }
1992                         }
1993                 }
1994                 si->si_dirty = !csn_changed;
1995                 ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1996
1997 added:
1998                 if ( do_check ) {
1999                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2000                         syncprov_checkpoint( op, on );
2001                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2002                 }
2003
2004                 /* only update consumer ctx if this is a newer csn */
2005                 if ( csn_changed ) {
2006                         opc->sctxcsn = maxcsn;
2007                 }
2008
2009                 /* Handle any persistent searches */
2010                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2011                 have_psearches = ( si->si_ops != NULL );
2012                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2013                 if ( have_psearches ) {
2014                         switch(op->o_tag) {
2015                         case LDAP_REQ_ADD:
2016                         case LDAP_REQ_MODIFY:
2017                         case LDAP_REQ_MODRDN:
2018                         case LDAP_REQ_EXTENDED:
2019                                 syncprov_matchops( op, opc, 0 );
2020                                 break;
2021                         case LDAP_REQ_DELETE:
2022                                 /* for each match in opc->smatches:
2023                                  *   send DELETE msg
2024                                  */
2025                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
2026                                         if ( sm->sm_op->s_op->o_abandon )
2027                                                 continue;
2028                                         syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_DELETE );
2029                                 }
2030                                 if ( opc->ssres.s_info )
2031                                         free_resinfo( &opc->ssres );
2032                                 break;
2033                         }
2034                 }
2035
2036                 /* Add any log records */
2037                 if ( si->si_logs ) {
2038                         syncprov_add_slog( op );
2039                 }
2040 leave:          ldap_pvt_thread_mutex_unlock( &si->si_resp_mutex );
2041         }
2042         return SLAP_CB_CONTINUE;
2043 }
2044
2045 /* We don't use a subentry to store the context CSN any more.
2046  * We expose the current context CSN as an operational attribute
2047  * of the suffix entry.
2048  */
2049 static int
2050 syncprov_op_compare( Operation *op, SlapReply *rs )
2051 {
2052         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2053         syncprov_info_t         *si = on->on_bi.bi_private;
2054         int rc = SLAP_CB_CONTINUE;
2055
2056         if ( dn_match( &op->o_req_ndn, &si->si_contextdn ) &&
2057                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
2058         {
2059                 Entry e = {0};
2060                 Attribute a = {0};
2061
2062                 e.e_name = si->si_contextdn;
2063                 e.e_nname = si->si_contextdn;
2064                 e.e_attrs = &a;
2065
2066                 a.a_desc = slap_schema.si_ad_contextCSN;
2067
2068                 ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2069
2070                 a.a_vals = si->si_ctxcsn;
2071                 a.a_nvals = a.a_vals;
2072                 a.a_numvals = si->si_numcsns;
2073
2074                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
2075                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
2076                 if ( ! rs->sr_err ) {
2077                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
2078                         goto return_results;
2079                 }
2080
2081                 if ( get_assert( op ) &&
2082                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
2083                 {
2084                         rs->sr_err = LDAP_ASSERTION_FAILED;
2085                         goto return_results;
2086                 }
2087
2088
2089                 rs->sr_err = LDAP_COMPARE_FALSE;
2090
2091                 if ( attr_valfind( &a,
2092                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
2093                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
2094                                 &op->oq_compare.rs_ava->aa_value, NULL, op->o_tmpmemctx ) == 0 )
2095                 {
2096                         rs->sr_err = LDAP_COMPARE_TRUE;
2097                 }
2098
2099 return_results:;
2100
2101                 ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2102
2103                 send_ldap_result( op, rs );
2104
2105                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
2106                         rs->sr_err = LDAP_SUCCESS;
2107                 }
2108                 rc = rs->sr_err;
2109         }
2110
2111         return rc;
2112 }
2113
2114 static int
2115 syncprov_op_mod( Operation *op, SlapReply *rs )
2116 {
2117         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2118         syncprov_info_t         *si = on->on_bi.bi_private;
2119         slap_callback *cb;
2120         opcookie *opc;
2121         int have_psearches, cbsize;
2122
2123         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2124         have_psearches = ( si->si_ops != NULL );
2125         si->si_active++;
2126         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2127
2128         cbsize = sizeof(slap_callback) + sizeof(opcookie) +
2129                 (have_psearches ? sizeof(modinst) : 0 );
2130
2131         cb = op->o_tmpcalloc(1, cbsize, op->o_tmpmemctx);
2132         opc = (opcookie *)(cb+1);
2133         opc->son = on;
2134         cb->sc_response = syncprov_op_response;
2135         cb->sc_cleanup = syncprov_op_cleanup;
2136         cb->sc_private = opc;
2137         cb->sc_next = op->o_callback;
2138         op->o_callback = cb;
2139
2140         opc->osid = -1;
2141         opc->rsid = -1;
2142         if ( op->o_csn.bv_val ) {
2143                 opc->osid = slap_parse_csn_sid( &op->o_csn );
2144         }
2145         if ( op->o_controls ) {
2146                 struct sync_cookie *scook =
2147                 op->o_controls[slap_cids.sc_LDAPsync];
2148                 if ( scook )
2149                         opc->rsid = scook->sid;
2150         }
2151
2152         if ( op->o_dont_replicate )
2153                 return SLAP_CB_CONTINUE;
2154
2155         /* If there are active persistent searches, lock this operation.
2156          * See seqmod.c for the locking logic on its own.
2157          */
2158         if ( have_psearches ) {
2159                 modtarget *mt, mtdummy;
2160                 modinst *mi;
2161
2162                 mi = (modinst *)(opc+1);
2163                 mi->mi_op = op;
2164
2165                 /* See if we're already modifying this entry... */
2166                 mtdummy.mt_dn = op->o_req_ndn;
2167 retry:
2168                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
2169                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
2170                 if ( mt ) {
2171                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
2172                         if ( mt->mt_mods == NULL ) {
2173                                 /* Cannot reuse this mt, as another thread is about
2174                                  * to release it in syncprov_op_cleanup. Wait for them
2175                                  * to finish; our own insert is required to succeed.
2176                                  */
2177                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2178                                 ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
2179                                 ldap_pvt_thread_yield();
2180                                 goto retry;
2181                         }
2182                 }
2183                 if ( mt ) {
2184                         mt->mt_tail->mi_next = mi;
2185                         mt->mt_tail = mi;
2186                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
2187                         /* wait for this op to get to head of list */
2188                         while ( mt->mt_mods != mi ) {
2189                                 modinst *m2;
2190                                 /* don't wait on other mods from the same thread */
2191                                 for ( m2 = mt->mt_mods; m2; m2 = m2->mi_next ) {
2192                                         if ( m2->mi_op->o_threadctx == op->o_threadctx ) {
2193                                                 break;
2194                                         }
2195                                 }
2196                                 if ( m2 )
2197                                         break;
2198
2199                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2200                                 /* FIXME: if dynamic config can delete overlays or
2201                                  * databases we'll have to check for cleanup here.
2202                                  * Currently it's not an issue because there are
2203                                  * no dynamic config deletes...
2204                                  */
2205                                 if ( slapd_shutdown )
2206                                         return SLAPD_ABANDON;
2207
2208                                 if ( !ldap_pvt_thread_pool_pausecheck( &connection_pool ))
2209                                         ldap_pvt_thread_yield();
2210                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
2211
2212                                 /* clean up if the caller is giving up */
2213                                 if ( op->o_abandon ) {
2214                                         modinst **m2;
2215                                         slap_callback **sc;
2216                                         for (m2 = &mt->mt_mods; ; m2 = &(*m2)->mi_next) {
2217                                                 if ( *m2 == mi ) {
2218                                                         *m2 = mi->mi_next;
2219                                                         if ( mt->mt_tail == mi )
2220                                                                 mt->mt_tail = ( m2 == &mt->mt_mods ) ? NULL : (modinst *)m2;
2221                                                         break;
2222                                                 }
2223                                         }
2224                                         for (sc = &op->o_callback; ; sc = &(*sc)->sc_next) {
2225                                                 if ( *sc == cb ) {
2226                                                         *sc = cb->sc_next;
2227                                                         break;
2228                                                 }
2229                                         }
2230                                         op->o_tmpfree( cb, op->o_tmpmemctx );
2231                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2232                                         return SLAPD_ABANDON;
2233                                 }
2234                         }
2235                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2236                 } else {
2237                         /* Record that we're modifying this entry now */
2238                         mt = ch_malloc( sizeof(modtarget) );
2239                         mt->mt_mods = mi;
2240                         mt->mt_tail = mi;
2241                         ber_dupbv( &mt->mt_dn, &mi->mi_op->o_req_ndn );
2242                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
2243                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
2244                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
2245                 }
2246                 opc->smt = mt;
2247         }
2248
2249         if (( have_psearches || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
2250                 syncprov_matchops( op, opc, 1 );
2251
2252         return SLAP_CB_CONTINUE;
2253 }
2254
2255 static int
2256 syncprov_op_extended( Operation *op, SlapReply *rs )
2257 {
2258         if ( exop_is_write( op ))
2259                 return syncprov_op_mod( op, rs );
2260
2261         return SLAP_CB_CONTINUE;
2262 }
2263
2264 typedef struct searchstate {
2265         slap_overinst *ss_on;
2266         syncops *ss_so;
2267         BerVarray ss_ctxcsn;
2268         int *ss_sids;
2269         int ss_numcsns;
2270 #define SS_PRESENT      0x01
2271 #define SS_CHANGED      0x02
2272         int ss_flags;
2273 } searchstate;
2274
2275 typedef struct SyncOperationBuffer {
2276         Operation               sob_op;
2277         Opheader                sob_hdr;
2278         OpExtra                 sob_oe;
2279         AttributeName   sob_extra;      /* not always present */
2280         /* Further data allocated here */
2281 } SyncOperationBuffer;
2282
2283 static void
2284 syncprov_detach_op( Operation *op, syncops *so, slap_overinst *on )
2285 {
2286         SyncOperationBuffer *sopbuf2;
2287         Operation *op2;
2288         int i, alen = 0;
2289         size_t size;
2290         char *ptr;
2291         GroupAssertion *g1, *g2;
2292
2293         /* count the search attrs */
2294         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2295                 alen += op->ors_attrs[i].an_name.bv_len + 1;
2296         }
2297         /* Make a new copy of the operation */
2298         size = offsetof( SyncOperationBuffer, sob_extra ) +
2299                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
2300                 op->o_req_dn.bv_len + 1 +
2301                 op->o_req_ndn.bv_len + 1 +
2302                 op->o_ndn.bv_len + 1 +
2303                 so->s_filterstr.bv_len + 1;
2304         sopbuf2 = ch_calloc( 1, size );
2305         op2 = &sopbuf2->sob_op;
2306         op2->o_hdr = &sopbuf2->sob_hdr;
2307         LDAP_SLIST_FIRST(&op2->o_extra) = &sopbuf2->sob_oe;
2308
2309         /* Copy the fields we care about explicitly, leave the rest alone */
2310         *op2->o_hdr = *op->o_hdr;
2311         op2->o_tag = op->o_tag;
2312         op2->o_time = op->o_time;
2313         op2->o_bd = on->on_info->oi_origdb;
2314         op2->o_request = op->o_request;
2315         op2->o_managedsait = op->o_managedsait;
2316         LDAP_SLIST_FIRST(&op2->o_extra)->oe_key = on;
2317         LDAP_SLIST_NEXT(LDAP_SLIST_FIRST(&op2->o_extra), oe_next) = NULL;
2318
2319         ptr = (char *) sopbuf2 + offsetof( SyncOperationBuffer, sob_extra );
2320         if ( i ) {
2321                 op2->ors_attrs = (AttributeName *) ptr;
2322                 ptr = (char *) &op2->ors_attrs[i+1];
2323                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2324                         op2->ors_attrs[i] = op->ors_attrs[i];
2325                         op2->ors_attrs[i].an_name.bv_val = ptr;
2326                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
2327                 }
2328                 BER_BVZERO( &op2->ors_attrs[i].an_name );
2329         }
2330
2331         op2->o_authz = op->o_authz;
2332         op2->o_ndn.bv_val = ptr;
2333         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
2334         op2->o_dn = op2->o_ndn;
2335         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
2336         op2->o_req_dn.bv_val = ptr;
2337         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
2338         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
2339         op2->o_req_ndn.bv_val = ptr;
2340         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
2341         op2->ors_filterstr.bv_val = ptr;
2342         strcpy( ptr, so->s_filterstr.bv_val );
2343         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
2344
2345         /* Skip the AND/GE clause that we stuck on in front */
2346         if ( so->s_flags & PS_FIX_FILTER ) {
2347                 op2->ors_filter = op->ors_filter->f_and->f_next;
2348                 so->s_flags ^= PS_FIX_FILTER;
2349         } else {
2350                 op2->ors_filter = op->ors_filter;
2351         }
2352         op2->ors_filter = filter_dup( op2->ors_filter, NULL );
2353         so->s_op = op2;
2354
2355         /* Copy any cached group ACLs individually */
2356         op2->o_groups = NULL;
2357         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
2358                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
2359                 *g2 = *g1;
2360                 strcpy( g2->ga_ndn, g1->ga_ndn );
2361                 g2->ga_next = op2->o_groups;
2362                 op2->o_groups = g2;
2363         }
2364         /* Don't allow any further group caching */
2365         op2->o_do_not_cache = 1;
2366
2367         /* Add op2 to conn so abandon will find us */
2368         op->o_conn->c_n_ops_executing++;
2369         op->o_conn->c_n_ops_completed--;
2370         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
2371         so->s_flags |= PS_IS_DETACHED;
2372
2373         /* Prevent anyone else from trying to send a result for this op */
2374         op->o_abandon = 1;
2375 }
2376
2377 static int
2378 syncprov_search_response( Operation *op, SlapReply *rs )
2379 {
2380         searchstate *ss = op->o_callback->sc_private;
2381         slap_overinst *on = ss->ss_on;
2382         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2383         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
2384
2385         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
2386                 Attribute *a;
2387                 /* If we got a referral without a referral object, there's
2388                  * something missing that we cannot replicate. Just ignore it.
2389                  * The consumer will abort because we didn't send the expected
2390                  * control.
2391                  */
2392                 if ( !rs->sr_entry ) {
2393                         assert( rs->sr_entry != NULL );
2394                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
2395                         return SLAP_CB_CONTINUE;
2396                 }
2397                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryCSN );
2398                 if ( a == NULL && rs->sr_operational_attrs != NULL ) {
2399                         a = attr_find( rs->sr_operational_attrs, slap_schema.si_ad_entryCSN );
2400                 }
2401                 if ( a ) {
2402                         int i, sid;
2403                         sid = slap_parse_csn_sid( &a->a_nvals[0] );
2404
2405                         /* If not a persistent search */
2406                         if ( !ss->ss_so ) {
2407                                 /* Make sure entry is less than the snapshot'd contextCSN */
2408                                 for ( i=0; i<ss->ss_numcsns; i++ ) {
2409                                         if ( sid == ss->ss_sids[i] && ber_bvcmp( &a->a_nvals[0],
2410                                                 &ss->ss_ctxcsn[i] ) > 0 ) {
2411                                                 Debug( LDAP_DEBUG_SYNC,
2412                                                         "Entry %s CSN %s greater than snapshot %s\n",
2413                                                         rs->sr_entry->e_name.bv_val,
2414                                                         a->a_nvals[0].bv_val,
2415                                                         ss->ss_ctxcsn[i].bv_val );
2416                                                 return LDAP_SUCCESS;
2417                                         }
2418                                 }
2419                         }
2420
2421                         /* Don't send old entries twice */
2422                         if ( srs->sr_state.ctxcsn ) {
2423                                 for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2424                                         if ( sid == srs->sr_state.sids[i] &&
2425                                                 ber_bvcmp( &a->a_nvals[0],
2426                                                         &srs->sr_state.ctxcsn[i] )<= 0 ) {
2427                                                 Debug( LDAP_DEBUG_SYNC,
2428                                                         "Entry %s CSN %s older or equal to ctx %s\n",
2429                                                         rs->sr_entry->e_name.bv_val,
2430                                                         a->a_nvals[0].bv_val,
2431                                                         srs->sr_state.ctxcsn[i].bv_val );
2432                                                 return LDAP_SUCCESS;
2433                                         }
2434                                 }
2435                         }
2436                 }
2437                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2438                         op->o_tmpmemctx );
2439                 rs->sr_ctrls[1] = NULL;
2440                 rs->sr_flags |= REP_CTRLS_MUSTBEFREED;
2441                 /* If we're in delta-sync mode, always send a cookie */
2442                 if ( si->si_nopres && si->si_usehint && a ) {
2443                         struct berval cookie;
2444                         slap_compose_sync_cookie( op, &cookie, a->a_nvals, srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2445                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2446                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 1, &cookie );
2447                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2448                 } else {
2449                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2450                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
2451                 }
2452         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
2453                 struct berval cookie = BER_BVNULL;
2454
2455                 if ( ( ss->ss_flags & SS_CHANGED ) &&
2456                         ss->ss_ctxcsn && !BER_BVISNULL( &ss->ss_ctxcsn[0] )) {
2457                         slap_compose_sync_cookie( op, &cookie, ss->ss_ctxcsn,
2458                                 srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2459
2460                         Debug( LDAP_DEBUG_SYNC, "syncprov_search_response: cookie=%s\n", cookie.bv_val, 0, 0 );
2461                 }
2462
2463                 /* Is this a regular refresh?
2464                  * Note: refresh never gets here if there were no changes
2465                  */
2466                 if ( !ss->ss_so ) {
2467                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2468                                 op->o_tmpmemctx );
2469                         rs->sr_ctrls[1] = NULL;
2470                         rs->sr_flags |= REP_CTRLS_MUSTBEFREED;
2471                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
2472                                 0, 1, &cookie, ( ss->ss_flags & SS_PRESENT ) ?  LDAP_SYNC_REFRESH_PRESENTS :
2473                                         LDAP_SYNC_REFRESH_DELETES );
2474                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2475                 } else {
2476                 /* It's RefreshAndPersist, transition to Persist phase */
2477                         syncprov_sendinfo( op, rs, ( ss->ss_flags & SS_PRESENT ) ?
2478                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
2479                                 ( ss->ss_flags & SS_CHANGED ) ? &cookie : NULL,
2480                                 1, NULL, 0 );
2481                         if ( !BER_BVISNULL( &cookie ))
2482                                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2483
2484                         /* Detach this Op from frontend control */
2485                         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
2486
2487                         /* But not if this connection was closed along the way */
2488                         if ( op->o_abandon ) {
2489                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2490                                 /* syncprov_ab_cleanup will free this syncop */
2491                                 return SLAPD_ABANDON;
2492
2493                         } else {
2494                                 ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
2495                                 /* Turn off the refreshing flag */
2496                                 ss->ss_so->s_flags ^= PS_IS_REFRESHING;
2497
2498                                 syncprov_detach_op( op, ss->ss_so, on );
2499
2500                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2501
2502                                 /* If there are queued responses, fire them off */
2503                                 if ( ss->ss_so->s_res )
2504                                         syncprov_qstart( ss->ss_so );
2505                                 ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
2506                         }
2507
2508                         return LDAP_SUCCESS;
2509                 }
2510         }
2511
2512         return SLAP_CB_CONTINUE;
2513 }
2514
2515 static int
2516 syncprov_op_search( Operation *op, SlapReply *rs )
2517 {
2518         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2519         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2520         slap_callback   *cb;
2521         int gotstate = 0, changed = 0, do_present = 0;
2522         syncops *sop = NULL;
2523         searchstate *ss;
2524         sync_control *srs;
2525         BerVarray ctxcsn;
2526         int i, *sids, numcsns;
2527         struct berval mincsn, maxcsn;
2528         int minsid, maxsid;
2529         int dirty = 0;
2530
2531         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
2532
2533         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
2534                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
2535                 return rs->sr_err;
2536         }
2537
2538         srs = op->o_controls[slap_cids.sc_LDAPsync];
2539
2540         /* If this is a persistent search, set it up right away */
2541         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
2542                 syncops so = {0};
2543                 fbase_cookie fc;
2544                 opcookie opc;
2545                 slap_callback sc = {0};
2546
2547                 fc.fss = &so;
2548                 fc.fbase = 0;
2549                 so.s_eid = NOID;
2550                 so.s_op = op;
2551                 so.s_flags = PS_IS_REFRESHING | PS_FIND_BASE;
2552                 /* syncprov_findbase expects to be called as a callback... */
2553                 sc.sc_private = &opc;
2554                 opc.son = on;
2555                 ldap_pvt_thread_mutex_init( &so.s_mutex );
2556                 cb = op->o_callback;
2557                 op->o_callback = &sc;
2558                 rs->sr_err = syncprov_findbase( op, &fc );
2559                 op->o_callback = cb;
2560                 ldap_pvt_thread_mutex_destroy( &so.s_mutex );
2561
2562                 if ( rs->sr_err != LDAP_SUCCESS ) {
2563                         send_ldap_result( op, rs );
2564                         return rs->sr_err;
2565                 }
2566                 sop = ch_malloc( sizeof( syncops ));
2567                 *sop = so;
2568                 sop->s_rid = srs->sr_state.rid;
2569                 sop->s_sid = srs->sr_state.sid;
2570                 /* set refcount=2 to prevent being freed out from under us
2571                  * by abandons that occur while we're running here
2572                  */
2573                 sop->s_inuse = 2;
2574
2575                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2576                 while ( si->si_active ) {
2577                         /* Wait for active mods to finish before proceeding, as they
2578                          * may already have inspected the si_ops list looking for
2579                          * consumers to replicate the change to.  Using the log
2580                          * doesn't help, as we may finish playing it before the
2581                          * active mods gets added to it.
2582                          */
2583                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2584                         if ( slapd_shutdown ) {
2585                                 ch_free( sop );
2586                                 return SLAPD_ABANDON;
2587                         }
2588                         if ( !ldap_pvt_thread_pool_pausecheck( &connection_pool ))
2589                                 ldap_pvt_thread_yield();
2590                         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2591                 }
2592                 if ( op->o_abandon ) {
2593                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2594                         ch_free( sop );
2595                         return SLAPD_ABANDON;
2596                 }
2597                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
2598                 sop->s_next = si->si_ops;
2599                 sop->s_si = si;
2600                 si->si_ops = sop;
2601                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2602         }
2603
2604         /* snapshot the ctxcsn
2605          * Note: this must not be done before the psearch setup. (ITS#8365)
2606          */
2607         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2608         numcsns = si->si_numcsns;
2609         if ( numcsns ) {
2610                 ber_bvarray_dup_x( &ctxcsn, si->si_ctxcsn, op->o_tmpmemctx );
2611                 sids = op->o_tmpalloc( numcsns * sizeof(int), op->o_tmpmemctx );
2612                 for ( i=0; i<numcsns; i++ )
2613                         sids[i] = si->si_sids[i];
2614         } else {
2615                 ctxcsn = NULL;
2616                 sids = NULL;
2617         }
2618         dirty = si->si_dirty;
2619         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2620
2621         /* If we have a cookie, handle the PRESENT lookups */
2622         if ( srs->sr_state.ctxcsn ) {
2623                 sessionlog *sl;
2624                 int i, j;
2625
2626                 /* If we don't have any CSN of our own yet, bail out.
2627                  */
2628                 if ( !numcsns ) {
2629                         rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
2630                         rs->sr_text = "consumer has state info but provider doesn't!";
2631                         goto bailout;
2632                 }
2633
2634                 if ( !si->si_nopres )
2635                         do_present = SS_PRESENT;
2636
2637                 /* If there are SIDs we don't recognize in the cookie, drop them */
2638                 for (i=0; i<srs->sr_state.numcsns; ) {
2639                         for (j=i; j<numcsns; j++) {
2640                                 if ( srs->sr_state.sids[i] <= sids[j] ) {
2641                                         break;
2642                                 }
2643                         }
2644                         /* not found */
2645                         if ( j == numcsns || srs->sr_state.sids[i] != sids[j] ) {
2646                                 char *tmp = srs->sr_state.ctxcsn[i].bv_val;
2647                                 srs->sr_state.numcsns--;
2648                                 for ( j=i; j<srs->sr_state.numcsns; j++ ) {
2649                                         srs->sr_state.ctxcsn[j] = srs->sr_state.ctxcsn[j+1];
2650                                         srs->sr_state.sids[j] = srs->sr_state.sids[j+1];
2651                                 }
2652                                 srs->sr_state.ctxcsn[j].bv_val = tmp;
2653                                 srs->sr_state.ctxcsn[j].bv_len = 0;
2654                                 continue;
2655                         }
2656                         i++;
2657                 }
2658
2659                 if (srs->sr_state.numcsns != numcsns) {
2660                         /* consumer doesn't have the right number of CSNs */
2661                         changed = SS_CHANGED;
2662                         if ( srs->sr_state.ctxcsn ) {
2663                                 ber_bvarray_free_x( srs->sr_state.ctxcsn, op->o_tmpmemctx );
2664                                 srs->sr_state.ctxcsn = NULL;
2665                         }
2666                         if ( srs->sr_state.sids ) {
2667                                 slap_sl_free( srs->sr_state.sids, op->o_tmpmemctx );
2668                                 srs->sr_state.sids = NULL;
2669                         }
2670                         srs->sr_state.numcsns = 0;
2671                         goto shortcut;
2672                 }
2673
2674                 /* Find the smallest CSN which differs from contextCSN */
2675                 mincsn.bv_len = 0;
2676                 maxcsn.bv_len = 0;
2677                 for ( i=0,j=0; i<srs->sr_state.numcsns; i++ ) {
2678                         int newer;
2679                         while ( srs->sr_state.sids[i] != sids[j] ) j++;
2680                         if ( BER_BVISEMPTY( &maxcsn ) || ber_bvcmp( &maxcsn,
2681                                 &srs->sr_state.ctxcsn[i] ) < 0 ) {
2682                                 maxcsn = srs->sr_state.ctxcsn[i];
2683                                 maxsid = sids[j];
2684                         }
2685                         newer = ber_bvcmp( &srs->sr_state.ctxcsn[i], &ctxcsn[j] );
2686                         /* If our state is newer, tell consumer about changes */
2687                         if ( newer < 0) {
2688                                 changed = SS_CHANGED;
2689                                 if ( BER_BVISEMPTY( &mincsn ) || ber_bvcmp( &mincsn,
2690                                         &srs->sr_state.ctxcsn[i] ) > 0 ) {
2691                                         mincsn = srs->sr_state.ctxcsn[i];
2692                                         minsid = sids[j];
2693                                 }
2694                         } else if ( newer > 0 && sids[j] == slap_serverID ) {
2695                         /* our state is older, complain to consumer */
2696                                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
2697                                 rs->sr_text = "consumer state is newer than provider!";
2698                                 Log4( LDAP_DEBUG_SYNC, ldap_syslog_level,
2699                                         "consumer %d state %s is newer than provider %d state %s\n",
2700                                         sids[i], srs->sr_state.ctxcsn[i].bv_val, sids[j], /* == slap_serverID */
2701                                         ctxcsn[j].bv_val);
2702 bailout:
2703                                 if ( sop ) {
2704                                         syncops **sp = &si->si_ops;
2705
2706                                         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2707                                         while ( *sp != sop )
2708                                                 sp = &(*sp)->s_next;
2709                                         *sp = sop->s_next;
2710                                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2711                                         ch_free( sop );
2712                                 }
2713                                 rs->sr_ctrls = NULL;
2714                                 send_ldap_result( op, rs );
2715                                 return rs->sr_err;
2716                         }
2717                 }
2718                 if ( BER_BVISEMPTY( &mincsn )) {
2719                         mincsn = maxcsn;
2720                         minsid = maxsid;
2721                 }
2722
2723                 /* If nothing has changed, shortcut it */
2724                 if ( !changed && !dirty ) {
2725                         do_present = 0;
2726 no_change:      if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
2727                                 LDAPControl     *ctrls[2];
2728
2729                                 ctrls[0] = NULL;
2730                                 ctrls[1] = NULL;
2731                                 syncprov_done_ctrl( op, rs, ctrls, 0, 0,
2732                                         NULL, LDAP_SYNC_REFRESH_DELETES );
2733                                 rs->sr_ctrls = ctrls;
2734                                 rs->sr_err = LDAP_SUCCESS;
2735                                 send_ldap_result( op, rs );
2736                                 rs->sr_ctrls = NULL;
2737                                 return rs->sr_err;
2738                         }
2739                         goto shortcut;
2740                 }
2741
2742                 /* Do we have a sessionlog for this search? */
2743                 sl=si->si_logs;
2744                 if ( sl ) {
2745                         int do_play = 0;
2746                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
2747                         /* Are there any log entries, and is the consumer state
2748                          * present in the session log?
2749                          */
2750                         if ( sl->sl_num > 0 ) {
2751                                 int i;
2752                                 for ( i=0; i<sl->sl_numcsns; i++ ) {
2753                                         /* SID not present == new enough */
2754                                         if ( minsid < sl->sl_sids[i] ) {
2755                                                 do_play = 1;
2756                                                 break;
2757                                         }
2758                                         /* SID present */
2759                                         if ( minsid == sl->sl_sids[i] ) {
2760                                                 /* new enough? */
2761                                                 if ( ber_bvcmp( &mincsn, &sl->sl_mincsn[i] ) >= 0 )
2762                                                         do_play = 1;
2763                                                 break;
2764                                         }
2765                                 }
2766                                 /* SID not present == new enough */
2767                                 if ( i == sl->sl_numcsns )
2768                                         do_play = 1;
2769                         }
2770                         if ( do_play ) {
2771                                 do_present = 0;
2772                                 /* mutex is unlocked in playlog */
2773                                 syncprov_playlog( op, rs, sl, srs, ctxcsn, numcsns, sids );
2774                         } else {
2775                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
2776                         }
2777                 }
2778                 /* Is the CSN still present in the database? */
2779                 if ( syncprov_findcsn( op, FIND_CSN, &mincsn ) != LDAP_SUCCESS ) {
2780                         /* No, so a reload is required */
2781                         /* the 2.2 consumer doesn't send this hint */
2782                         if ( si->si_usehint && srs->sr_rhint == 0 ) {
2783                                 if ( ctxcsn )
2784                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2785                                 if ( sids )
2786                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2787                                 rs->sr_err = LDAP_SYNC_REFRESH_REQUIRED;
2788                                 rs->sr_text = "sync cookie is stale";
2789                                 goto bailout;
2790                         }
2791                         if ( srs->sr_state.ctxcsn ) {
2792                                 ber_bvarray_free_x( srs->sr_state.ctxcsn, op->o_tmpmemctx );
2793                                 srs->sr_state.ctxcsn = NULL;
2794                         }
2795                         if ( srs->sr_state.sids ) {
2796                                 slap_sl_free( srs->sr_state.sids, op->o_tmpmemctx );
2797                                 srs->sr_state.sids = NULL;
2798                         }
2799                         srs->sr_state.numcsns = 0;
2800                 } else {
2801                         gotstate = 1;
2802                         /* If changed and doing Present lookup, send Present UUIDs */
2803                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT, 0 ) !=
2804                                 LDAP_SUCCESS ) {
2805                                 if ( ctxcsn )
2806                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2807                                 if ( sids )
2808                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2809                                 goto bailout;
2810                         }
2811                 }
2812         } else {
2813                 /* The consumer knows nothing, we know nothing. OK. */
2814                 if (!numcsns)
2815                         goto no_change;
2816                 /* No consumer state, assume something has changed */
2817                 changed = SS_CHANGED;
2818         }
2819
2820 shortcut:
2821         /* Append CSN range to search filter, save original filter
2822          * for persistent search evaluation
2823          */
2824         if ( sop ) {
2825                 ldap_pvt_thread_mutex_lock( &sop->s_mutex );
2826                 sop->s_filterstr = op->ors_filterstr;
2827                 /* correct the refcount that was set to 2 before */
2828                 sop->s_inuse--;
2829         }
2830
2831         /* If something changed, find the changes */
2832         if ( gotstate && ( changed || dirty ) ) {
2833                 Filter *fand, *fava;
2834
2835                 fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2836                 fand->f_choice = LDAP_FILTER_AND;
2837                 fand->f_next = NULL;
2838                 fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2839                 fand->f_and = fava;
2840                 fava->f_choice = LDAP_FILTER_GE;
2841                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
2842                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
2843 #ifdef LDAP_COMP_MATCH
2844                 fava->f_ava->aa_cf = NULL;
2845 #endif
2846                 ber_dupbv_x( &fava->f_ava->aa_value, &mincsn, op->o_tmpmemctx );
2847                 fava->f_next = op->ors_filter;
2848                 op->ors_filter = fand;
2849                 filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
2850                 if ( sop ) {
2851                         sop->s_flags |= PS_FIX_FILTER;
2852                 }
2853         }
2854         if ( sop ) {
2855                 ldap_pvt_thread_mutex_unlock( &sop->s_mutex );
2856         }
2857
2858         /* Let our callback add needed info to returned entries */
2859         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
2860         ss = (searchstate *)(cb+1);
2861         ss->ss_on = on;
2862         ss->ss_so = sop;
2863         ss->ss_flags = do_present | changed;
2864         ss->ss_ctxcsn = ctxcsn;
2865         ss->ss_numcsns = numcsns;
2866         ss->ss_sids = sids;
2867         cb->sc_response = syncprov_search_response;
2868         cb->sc_private = ss;
2869         cb->sc_next = op->o_callback;
2870         op->o_callback = cb;
2871
2872         /* If this is a persistent search and no changes were reported during
2873          * the refresh phase, just invoke the response callback to transition
2874          * us into persist phase
2875          */
2876         if ( !changed && !dirty ) {
2877                 rs->sr_err = LDAP_SUCCESS;
2878                 rs->sr_nentries = 0;
2879                 send_ldap_result( op, rs );
2880                 return rs->sr_err;
2881         }
2882         return SLAP_CB_CONTINUE;
2883 }
2884
2885 static int
2886 syncprov_operational(
2887         Operation *op,
2888         SlapReply *rs )
2889 {
2890         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2891         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2892
2893         /* This prevents generating unnecessarily; frontend will strip
2894          * any statically stored copy.
2895          */
2896         if ( op->o_sync != SLAP_CONTROL_NONE )
2897                 return SLAP_CB_CONTINUE;
2898
2899         if ( rs->sr_entry &&
2900                 dn_match( &rs->sr_entry->e_nname, &si->si_contextdn )) {
2901
2902                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
2903                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
2904                         Attribute *a, **ap = NULL;
2905
2906                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
2907                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
2908                                         break;
2909                         }
2910
2911                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2912                         if ( si->si_ctxcsn ) {
2913                                 if ( !a ) {
2914                                         for ( ap = &rs->sr_operational_attrs; *ap;
2915                                                 ap=&(*ap)->a_next );
2916
2917                                         a = attr_alloc( slap_schema.si_ad_contextCSN );
2918                                         *ap = a;
2919                                 }
2920
2921                                 if ( !ap ) {
2922                                         if ( rs_entry2modifiable( op, rs, on )) {
2923                                                 a = attr_find( rs->sr_entry->e_attrs,
2924                                                         slap_schema.si_ad_contextCSN );
2925                                         }
2926                                         if ( a->a_nvals != a->a_vals ) {
2927                                                 ber_bvarray_free( a->a_nvals );
2928                                         }
2929                                         a->a_nvals = NULL;
2930                                         ber_bvarray_free( a->a_vals );
2931                                         a->a_vals = NULL;
2932                                         a->a_numvals = 0;
2933                                 }
2934                                 attr_valadd( a, si->si_ctxcsn, si->si_ctxcsn, si->si_numcsns );
2935                         }
2936                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2937                 }
2938         }
2939         return SLAP_CB_CONTINUE;
2940 }
2941
2942 enum {
2943         SP_CHKPT = 1,
2944         SP_SESSL,
2945         SP_NOPRES,
2946         SP_USEHINT
2947 };
2948
2949 static ConfigDriver sp_cf_gen;
2950
2951 static ConfigTable spcfg[] = {
2952         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2953                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2954                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2955                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2956         { "syncprov-sessionlog", "ops", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2957                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2958                         "DESC 'Session log size in ops' "
2959                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2960         { "syncprov-nopresent", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_NOPRES,
2961                 sp_cf_gen, "( OLcfgOvAt:1.3 NAME 'olcSpNoPresent' "
2962                         "DESC 'Omit Present phase processing' "
2963                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2964         { "syncprov-reloadhint", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_USEHINT,
2965                 sp_cf_gen, "( OLcfgOvAt:1.4 NAME 'olcSpReloadHint' "
2966                         "DESC 'Observe Reload Hint in Request control' "
2967                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2968         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2969 };
2970
2971 static ConfigOCs spocs[] = {
2972         { "( OLcfgOvOc:1.1 "
2973                 "NAME 'olcSyncProvConfig' "
2974                 "DESC 'SyncRepl Provider configuration' "
2975                 "SUP olcOverlayConfig "
2976                 "MAY ( olcSpCheckpoint "
2977                         "$ olcSpSessionlog "
2978                         "$ olcSpNoPresent "
2979                         "$ olcSpReloadHint "
2980                 ") )",
2981                         Cft_Overlay, spcfg },
2982         { NULL, 0, NULL }
2983 };
2984
2985 static int
2986 sp_cf_gen(ConfigArgs *c)
2987 {
2988         slap_overinst           *on = (slap_overinst *)c->bi;
2989         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2990         int rc = 0;
2991
2992         if ( c->op == SLAP_CONFIG_EMIT ) {
2993                 switch ( c->type ) {
2994                 case SP_CHKPT:
2995                         if ( si->si_chkops || si->si_chktime ) {
2996                                 struct berval bv;
2997                                 /* we assume si_chktime is a multiple of 60
2998                                  * because the parsed value was originally
2999                                  * multiplied by 60 */
3000                                 bv.bv_len = snprintf( c->cr_msg, sizeof( c->cr_msg ),
3001                                         "%d %d", si->si_chkops, si->si_chktime/60 );
3002                                 if ( bv.bv_len >= sizeof( c->cr_msg ) ) {
3003                                         rc = 1;
3004                                 } else {
3005                                         bv.bv_val = c->cr_msg;
3006                                         value_add_one( &c->rvalue_vals, &bv );
3007                                 }
3008                         } else {
3009                                 rc = 1;
3010                         }
3011                         break;
3012                 case SP_SESSL:
3013                         if ( si->si_logs ) {
3014                                 c->value_int = si->si_logs->sl_size;
3015                         } else {
3016                                 rc = 1;
3017                         }
3018                         break;
3019                 case SP_NOPRES:
3020                         if ( si->si_nopres ) {
3021                                 c->value_int = 1;
3022                         } else {
3023                                 rc = 1;
3024                         }
3025                         break;
3026                 case SP_USEHINT:
3027                         if ( si->si_usehint ) {
3028                                 c->value_int = 1;
3029                         } else {
3030                                 rc = 1;
3031                         }
3032                         break;
3033                 }
3034                 return rc;
3035         } else if ( c->op == LDAP_MOD_DELETE ) {
3036                 switch ( c->type ) {
3037                 case SP_CHKPT:
3038                         si->si_chkops = 0;
3039                         si->si_chktime = 0;
3040                         break;
3041                 case SP_SESSL:
3042                         si->si_logs->sl_size = 0;
3043                         break;
3044                 case SP_NOPRES:
3045                         si->si_nopres = 0;
3046                         break;
3047                 case SP_USEHINT:
3048                         si->si_usehint = 0;
3049                         break;
3050                 }
3051                 return rc;
3052         }
3053         switch ( c->type ) {
3054         case SP_CHKPT:
3055                 if ( lutil_atoi( &si->si_chkops, c->argv[1] ) != 0 ) {
3056                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint ops # \"%s\"",
3057                                 c->argv[0], c->argv[1] );
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 ( si->si_chkops <= 0 ) {
3063                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint ops # \"%d\"",
3064                                 c->argv[0], si->si_chkops );
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 ( lutil_atoi( &si->si_chktime, c->argv[2] ) != 0 ) {
3070                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint time \"%s\"",
3071                                 c->argv[0], c->argv[1] );
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                 if ( si->si_chktime <= 0 ) {
3077                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint time \"%d\"",
3078                                 c->argv[0], si->si_chkops );
3079                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
3080                                 "%s: %s\n", c->log, c->cr_msg, 0 );
3081                         return ARG_BAD_CONF;
3082                 }
3083                 si->si_chktime *= 60;
3084                 break;
3085         case SP_SESSL: {
3086                 sessionlog *sl;
3087                 int size = c->value_int;
3088
3089                 if ( size < 0 ) {
3090                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s size %d is negative",
3091                                 c->argv[0], size );
3092                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
3093                                 "%s: %s\n", c->log, c->cr_msg, 0 );
3094                         return ARG_BAD_CONF;
3095                 }
3096                 sl = si->si_logs;
3097                 if ( !sl ) {
3098                         sl = ch_malloc( sizeof( sessionlog ));
3099                         sl->sl_mincsn = NULL;
3100                         sl->sl_sids = NULL;
3101                         sl->sl_num = 0;
3102                         sl->sl_numcsns = 0;
3103                         sl->sl_head = sl->sl_tail = NULL;
3104                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
3105                         si->si_logs = sl;
3106                 }
3107                 sl->sl_size = size;
3108                 }
3109                 break;
3110         case SP_NOPRES:
3111                 si->si_nopres = c->value_int;
3112                 break;
3113         case SP_USEHINT:
3114                 si->si_usehint = c->value_int;
3115                 break;
3116         }
3117         return rc;
3118 }
3119
3120 /* ITS#3456 we cannot run this search on the main thread, must use a
3121  * child thread in order to insure we have a big enough stack.
3122  */
3123 static void *
3124 syncprov_db_otask(
3125         void *ptr
3126 )
3127 {
3128         syncprov_findcsn( ptr, FIND_MAXCSN, 0 );
3129         return NULL;
3130 }
3131
3132
3133 /* Read any existing contextCSN from the underlying db.
3134  * Then search for any entries newer than that. If no value exists,
3135  * just generate it. Cache whatever result.
3136  */
3137 static int
3138 syncprov_db_open(
3139         BackendDB *be,
3140         ConfigReply *cr
3141 )
3142 {
3143         slap_overinst   *on = (slap_overinst *) be->bd_info;
3144         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3145
3146         Connection conn = { 0 };
3147         OperationBuffer opbuf;
3148         Operation *op;
3149         Entry *e = NULL;
3150         Attribute *a;
3151         int rc;
3152         void *thrctx = NULL;
3153
3154         if ( !SLAP_LASTMOD( be )) {
3155                 Debug( LDAP_DEBUG_ANY,
3156                         "syncprov_db_open: invalid config, lastmod must be enabled\n", 0, 0, 0 );
3157                 return -1;
3158         }
3159
3160         if ( slapMode & SLAP_TOOL_MODE ) {
3161                 return 0;
3162         }
3163
3164         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
3165         if ( rc ) {
3166                 return rc;
3167         }
3168
3169         thrctx = ldap_pvt_thread_pool_context();
3170         connection_fake_init2( &conn, &opbuf, thrctx, 0 );
3171         op = &opbuf.ob_op;
3172         op->o_bd = be;
3173         op->o_dn = be->be_rootdn;
3174         op->o_ndn = be->be_rootndn;
3175
3176         if ( SLAP_SYNC_SUBENTRY( be )) {
3177                 build_new_dn( &si->si_contextdn, be->be_nsuffix,
3178                         (struct berval *)&slap_ldapsync_cn_bv, NULL );
3179         } else {
3180                 si->si_contextdn = be->be_nsuffix[0];
3181         }
3182         rc = overlay_entry_get_ov( op, &si->si_contextdn, NULL,
3183                 slap_schema.si_ad_contextCSN, 0, &e, on );
3184
3185         if ( e ) {
3186                 ldap_pvt_thread_t tid;
3187
3188                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
3189                 if ( a ) {
3190                         ber_bvarray_dup_x( &si->si_ctxcsn, a->a_vals, NULL );
3191                         si->si_numcsns = a->a_numvals;
3192                         si->si_sids = slap_parse_csn_sids( si->si_ctxcsn, a->a_numvals, NULL );
3193                         slap_sort_csn_sids( si->si_ctxcsn, si->si_sids, si->si_numcsns, NULL );
3194                 }
3195                 overlay_entry_release_ov( op, e, 0, on );
3196                 if ( si->si_ctxcsn && !SLAP_DBCLEAN( be )) {
3197                         op->o_tag = LDAP_REQ_SEARCH;
3198                         op->o_req_dn = be->be_suffix[0];
3199                         op->o_req_ndn = be->be_nsuffix[0];
3200                         op->ors_scope = LDAP_SCOPE_SUBTREE;
3201                         ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
3202                         ldap_pvt_thread_join( tid, NULL );
3203                 }
3204         }
3205
3206         /* Didn't find a contextCSN, should we generate one? */
3207         if ( !si->si_ctxcsn ) {
3208                 char csnbuf[ LDAP_PVT_CSNSTR_BUFSIZE ];
3209                 struct berval csn;
3210
3211                 if ( slap_serverID || SLAP_SYNC_SHADOW( op->o_bd )) {
3212                 /* If we're also a consumer, then don't generate anything.
3213                  * Wait for our provider to send it to us, or for a local
3214                  * modify if we have multimaster.
3215                  */
3216                         goto out;
3217                 }
3218                 csn.bv_val = csnbuf;
3219                 csn.bv_len = sizeof( csnbuf );
3220                 slap_get_csn( op, &csn, 0 );
3221                 value_add_one( &si->si_ctxcsn, &csn );
3222                 si->si_numcsns = 1;
3223                 si->si_sids = ch_malloc( sizeof(int) );
3224                 si->si_sids[0] = slap_serverID;
3225
3226                 /* make sure we do a checkpoint on close */
3227                 si->si_numops++;
3228         }
3229
3230         /* Initialize the sessionlog mincsn */
3231         if ( si->si_logs && si->si_numcsns ) {
3232                 sessionlog *sl = si->si_logs;
3233                 int i;
3234                 ber_bvarray_dup_x( &sl->sl_mincsn, si->si_ctxcsn, NULL );
3235                 sl->sl_numcsns = si->si_numcsns;
3236                 sl->sl_sids = ch_malloc( si->si_numcsns * sizeof(int) );
3237                 for ( i=0; i < si->si_numcsns; i++ )
3238                         sl->sl_sids[i] = si->si_sids[i];
3239         }
3240
3241 out:
3242         op->o_bd->bd_info = (BackendInfo *)on;
3243         return 0;
3244 }
3245
3246 /* Write the current contextCSN into the underlying db.
3247  */
3248 static int
3249 syncprov_db_close(
3250         BackendDB *be,
3251         ConfigReply *cr
3252 )
3253 {
3254         slap_overinst   *on = (slap_overinst *) be->bd_info;
3255         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3256 #ifdef SLAP_CONFIG_DELETE
3257         syncops *so, *sonext;
3258 #endif /* SLAP_CONFIG_DELETE */
3259
3260         if ( slapMode & SLAP_TOOL_MODE ) {
3261                 return 0;
3262         }
3263         if ( si->si_numops ) {
3264                 Connection conn = {0};
3265                 OperationBuffer opbuf;
3266                 Operation *op;
3267                 void *thrctx;
3268
3269                 thrctx = ldap_pvt_thread_pool_context();
3270                 connection_fake_init2( &conn, &opbuf, thrctx, 0 );
3271                 op = &opbuf.ob_op;
3272                 op->o_bd = be;
3273                 op->o_dn = be->be_rootdn;
3274                 op->o_ndn = be->be_rootndn;
3275                 syncprov_checkpoint( op, on );
3276         }
3277
3278 #ifdef SLAP_CONFIG_DELETE
3279         if ( !slapd_shutdown ) {
3280                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
3281                 for ( so=si->si_ops, sonext=so;  so; so=sonext  ) {
3282                         SlapReply rs = {REP_RESULT};
3283                         rs.sr_err = LDAP_UNAVAILABLE;
3284                         send_ldap_result( so->s_op, &rs );
3285                         sonext=so->s_next;
3286                         if ( so->s_flags & PS_TASK_QUEUED )
3287                                 ldap_pvt_thread_pool_retract( so->s_pool_cookie );
3288                         if ( !syncprov_drop_psearch( so, 0 ))
3289                                 so->s_si = NULL;
3290                 }
3291                 si->si_ops=NULL;
3292                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
3293         }
3294         overlay_unregister_control( be, LDAP_CONTROL_SYNC );
3295 #endif /* SLAP_CONFIG_DELETE */
3296
3297         return 0;
3298 }
3299
3300 static int
3301 syncprov_db_init(
3302         BackendDB *be,
3303         ConfigReply *cr
3304 )
3305 {
3306         slap_overinst   *on = (slap_overinst *)be->bd_info;
3307         syncprov_info_t *si;
3308
3309         if ( SLAP_ISGLOBALOVERLAY( be ) ) {
3310                 Debug( LDAP_DEBUG_ANY,
3311                         "syncprov must be instantiated within a database.\n",
3312                         0, 0, 0 );
3313                 return 1;
3314         }
3315
3316         si = ch_calloc(1, sizeof(syncprov_info_t));
3317         on->on_bi.bi_private = si;
3318         ldap_pvt_thread_rdwr_init( &si->si_csn_rwlock );
3319         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
3320         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
3321         ldap_pvt_thread_mutex_init( &si->si_resp_mutex );
3322
3323         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
3324         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
3325         csn_anlist[1].an_desc = slap_schema.si_ad_entryUUID;
3326         csn_anlist[1].an_name = slap_schema.si_ad_entryUUID->ad_cname;
3327
3328         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
3329         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
3330
3331         return 0;
3332 }
3333
3334 static int
3335 syncprov_db_destroy(
3336         BackendDB *be,
3337         ConfigReply *cr
3338 )
3339 {
3340         slap_overinst   *on = (slap_overinst *)be->bd_info;
3341         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3342
3343         if ( si ) {
3344                 if ( si->si_logs ) {
3345                         sessionlog *sl = si->si_logs;
3346                         slog_entry *se = sl->sl_head;
3347
3348                         while ( se ) {
3349                                 slog_entry *se_next = se->se_next;
3350                                 ch_free( se );
3351                                 se = se_next;
3352                         }
3353                         if ( sl->sl_mincsn )
3354                                 ber_bvarray_free( sl->sl_mincsn );
3355                         if ( sl->sl_sids )
3356                                 ch_free( sl->sl_sids );
3357
3358                         ldap_pvt_thread_mutex_destroy(&si->si_logs->sl_mutex);
3359                         ch_free( si->si_logs );
3360                 }
3361                 if ( si->si_ctxcsn )
3362                         ber_bvarray_free( si->si_ctxcsn );
3363                 if ( si->si_sids )
3364                         ch_free( si->si_sids );
3365                 ldap_pvt_thread_mutex_destroy( &si->si_resp_mutex );
3366                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
3367                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
3368                 ldap_pvt_thread_rdwr_destroy( &si->si_csn_rwlock );
3369                 ch_free( si );
3370         }
3371
3372         return 0;
3373 }
3374
3375 static int syncprov_parseCtrl (
3376         Operation *op,
3377         SlapReply *rs,
3378         LDAPControl *ctrl )
3379 {
3380         ber_tag_t tag;
3381         BerElementBuffer berbuf;
3382         BerElement *ber = (BerElement *)&berbuf;
3383         ber_int_t mode;
3384         ber_len_t len;
3385         struct berval cookie = BER_BVNULL;
3386         sync_control *sr;
3387         int rhint = 0;
3388
3389         if ( op->o_sync != SLAP_CONTROL_NONE ) {
3390                 rs->sr_text = "Sync control specified multiple times";
3391                 return LDAP_PROTOCOL_ERROR;
3392         }
3393
3394         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
3395                 rs->sr_text = "Sync control specified with pagedResults control";
3396                 return LDAP_PROTOCOL_ERROR;
3397         }
3398
3399         if ( BER_BVISNULL( &ctrl->ldctl_value ) ) {
3400                 rs->sr_text = "Sync control value is absent";
3401                 return LDAP_PROTOCOL_ERROR;
3402         }
3403
3404         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
3405                 rs->sr_text = "Sync control value is empty";
3406                 return LDAP_PROTOCOL_ERROR;
3407         }
3408
3409         /* Parse the control value
3410          *      syncRequestValue ::= SEQUENCE {
3411          *              mode   ENUMERATED {
3412          *                      -- 0 unused
3413          *                      refreshOnly             (1),
3414          *                      -- 2 reserved
3415          *                      refreshAndPersist       (3)
3416          *              },
3417          *              cookie  syncCookie OPTIONAL
3418          *      }
3419          */
3420
3421         ber_init2( ber, &ctrl->ldctl_value, 0 );
3422
3423         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
3424                 rs->sr_text = "Sync control : mode decoding error";
3425                 return LDAP_PROTOCOL_ERROR;
3426         }
3427
3428         switch( mode ) {
3429         case LDAP_SYNC_REFRESH_ONLY:
3430                 mode = SLAP_SYNC_REFRESH;
3431                 break;
3432         case LDAP_SYNC_REFRESH_AND_PERSIST:
3433                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
3434                 break;
3435         default:
3436                 rs->sr_text = "Sync control : unknown update mode";
3437                 return LDAP_PROTOCOL_ERROR;
3438         }
3439
3440         tag = ber_peek_tag( ber, &len );
3441
3442         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
3443                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
3444                         rs->sr_text = "Sync control : cookie decoding error";
3445                         return LDAP_PROTOCOL_ERROR;
3446                 }
3447                 tag = ber_peek_tag( ber, &len );
3448         }
3449         if ( tag == LDAP_TAG_RELOAD_HINT ) {
3450                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
3451                         rs->sr_text = "Sync control : rhint decoding error";
3452                         return LDAP_PROTOCOL_ERROR;
3453                 }
3454         }
3455         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
3456                         rs->sr_text = "Sync control : decoding error";
3457                         return LDAP_PROTOCOL_ERROR;
3458         }
3459         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
3460         sr->sr_rhint = rhint;
3461         if (!BER_BVISNULL(&cookie)) {
3462                 ber_dupbv_x( &sr->sr_state.octet_str, &cookie, op->o_tmpmemctx );
3463                 /* If parse fails, pretend no cookie was sent */
3464                 if ( slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx ) ||
3465                         sr->sr_state.rid == -1 ) {
3466                         if ( sr->sr_state.ctxcsn ) {
3467                                 ber_bvarray_free_x( sr->sr_state.ctxcsn, op->o_tmpmemctx );
3468                                 sr->sr_state.ctxcsn = NULL;
3469                         }
3470                         sr->sr_state.numcsns = 0;
3471                 }
3472         }
3473
3474         op->o_controls[slap_cids.sc_LDAPsync] = sr;
3475
3476         op->o_sync = ctrl->ldctl_iscritical
3477                 ? SLAP_CONTROL_CRITICAL
3478                 : SLAP_CONTROL_NONCRITICAL;
3479
3480         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
3481
3482         return LDAP_SUCCESS;
3483 }
3484
3485 /* This overlay is set up for dynamic loading via moduleload. For static
3486  * configuration, you'll need to arrange for the slap_overinst to be
3487  * initialized and registered by some other function inside slapd.
3488  */
3489
3490 static slap_overinst            syncprov;
3491
3492 int
3493 syncprov_initialize()
3494 {
3495         int rc;
3496
3497         rc = register_supported_control( LDAP_CONTROL_SYNC,
3498                 SLAP_CTRL_SEARCH, NULL,
3499                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
3500         if ( rc != LDAP_SUCCESS ) {
3501                 Debug( LDAP_DEBUG_ANY,
3502                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
3503                 return rc;
3504         }
3505
3506         syncprov.on_bi.bi_type = "syncprov";
3507         syncprov.on_bi.bi_db_init = syncprov_db_init;
3508         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
3509         syncprov.on_bi.bi_db_open = syncprov_db_open;
3510         syncprov.on_bi.bi_db_close = syncprov_db_close;
3511
3512         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
3513         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
3514
3515         syncprov.on_bi.bi_op_add = syncprov_op_mod;
3516         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
3517         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
3518         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
3519         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
3520         syncprov.on_bi.bi_op_search = syncprov_op_search;
3521         syncprov.on_bi.bi_extended = syncprov_op_extended;
3522         syncprov.on_bi.bi_operational = syncprov_operational;
3523
3524         syncprov.on_bi.bi_cf_ocs = spocs;
3525
3526         generic_filter.f_desc = slap_schema.si_ad_objectClass;
3527
3528         rc = config_register_schema( spcfg, spocs );
3529         if ( rc ) return rc;
3530
3531         return overlay_register( &syncprov );
3532 }
3533
3534 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
3535 int
3536 init_module( int argc, char *argv[] )
3537 {
3538         return syncprov_initialize();
3539 }
3540 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
3541
3542 #endif /* defined(SLAPD_OVER_SYNCPROV) */