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

   1 /* $OpenLDAP$ */
   2 /* syncprov.c - syncrepl provider */
   3 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   4  *
   5  * Copyright 2004-2014 The OpenLDAP Foundation.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted only as authorized by the OpenLDAP
  10  * Public License.
  11  *
  12  * A copy of this license is available in the file LICENSE in the
  13  * top-level directory of the distribution or, alternatively, at
  14  * <http://www.OpenLDAP.org/license.html>.
  15  */
  16 /* ACKNOWLEDGEMENTS:
  17  * This work was initially developed by Howard Chu for inclusion in
  18  * OpenLDAP Software.
  19  */
  20
  21 #include "portable.h"
  22
  23 #ifdef SLAPD_OVER_SYNCPROV
  24
  25 #include <ac/string.h>
  26 #include "lutil.h"
  27 #include "slap.h"
  28 #include "config.h"
  29 #include "ldap_rq.h"
  30
  31 #ifdef LDAP_DEVEL
  32 #define CHECK_CSN       1
  33 #endif
  34
  35 /* A modify request on a particular entry */
  36 typedef struct modinst {
  37         struct modinst *mi_next;
  38         Operation *mi_op;
  39 } modinst;
  40
  41 typedef struct modtarget {
  42         struct modinst *mt_mods;
  43         struct modinst *mt_tail;
  44         struct berval mt_dn;
  45         ldap_pvt_thread_mutex_t mt_mutex;
  46 } modtarget;
  47
  48 /* All the info of a psearch result that's shared between
  49  * multiple queues
  50  */
  51 typedef struct resinfo {
  52         struct syncres *ri_list;
  53         Entry *ri_e;
  54         struct berval ri_dn;
  55         struct berval ri_ndn;
  56         struct berval ri_uuid;
  57         struct berval ri_csn;
  58         struct berval ri_cookie;
  59         char ri_isref;
  60         ldap_pvt_thread_mutex_t ri_mutex;
  61 } resinfo;
  62
  63 /* A queued result of a persistent search */
  64 typedef struct syncres {
  65         struct syncres *s_next; /* list of results on this psearch queue */
  66         struct syncres *s_rilist;       /* list of psearches using this result */
  67         resinfo *s_info;
  68         char s_mode;
  69 } syncres;
  70
  71 /* Record of a persistent search */
  72 typedef struct syncops {
  73         struct syncops *s_next;
  74         struct berval   s_base;         /* ndn of search base */
  75         ID              s_eid;          /* entryID of search base */
  76         Operation       *s_op;          /* search op */
  77         int             s_rid;
  78         int             s_sid;
  79         struct berval s_filterstr;
  80         int             s_flags;        /* search status */
  81 #define PS_IS_REFRESHING        0x01
  82 #define PS_IS_DETACHED          0x02
  83 #define PS_WROTE_BASE           0x04
  84 #define PS_FIND_BASE            0x08
  85 #define PS_FIX_FILTER           0x10
  86 #define PS_TASK_QUEUED          0x20
  87
  88         int             s_inuse;        /* reference count */
  89         struct syncres *s_res;
  90         struct syncres *s_restail;
  91         ldap_pvt_thread_mutex_t s_mutex;
  92 } syncops;
  93
  94 /* A received sync control */
  95 typedef struct sync_control {
  96         struct sync_cookie sr_state;
  97         int sr_rhint;
  98 } sync_control;
  99
 100 #if 0 /* moved back to slap.h */
 101 #define o_sync  o_ctrlflag[slap_cids.sc_LDAPsync]
 102 #endif
 103 /* o_sync_mode uses data bits of o_sync */
 104 #define o_sync_mode     o_ctrlflag[slap_cids.sc_LDAPsync]
 105
 106 #define SLAP_SYNC_NONE                                  (LDAP_SYNC_NONE<<SLAP_CONTROL_SHIFT)
 107 #define SLAP_SYNC_REFRESH                               (LDAP_SYNC_REFRESH_ONLY<<SLAP_CONTROL_SHIFT)
 108 #define SLAP_SYNC_PERSIST                               (LDAP_SYNC_RESERVED<<SLAP_CONTROL_SHIFT)
 109 #define SLAP_SYNC_REFRESH_AND_PERSIST   (LDAP_SYNC_REFRESH_AND_PERSIST<<SLAP_CONTROL_SHIFT)
 110
 111 /* Record of which searches matched at premodify step */
 112 typedef struct syncmatches {
 113         struct syncmatches *sm_next;
 114         syncops *sm_op;
 115 } syncmatches;
 116
 117 /* Session log data */
 118 typedef struct slog_entry {
 119         struct slog_entry *se_next;
 120         struct berval se_uuid;
 121         struct berval se_csn;
 122         int     se_sid;
 123         ber_tag_t       se_tag;
 124 } slog_entry;
 125
 126 typedef struct sessionlog {
 127         BerVarray       sl_mincsn;
 128         int             *sl_sids;
 129         int             sl_numcsns;
 130         int             sl_num;
 131         int             sl_size;
 132         slog_entry *sl_head;
 133         slog_entry *sl_tail;
 134         ldap_pvt_thread_mutex_t sl_mutex;
 135 } sessionlog;
 136
 137 /* The main state for this overlay */
 138 typedef struct syncprov_info_t {
 139         syncops         *si_ops;
 140         struct berval   si_contextdn;
 141         BerVarray       si_ctxcsn;      /* ldapsync context */
 142         int             *si_sids;
 143         int             si_numcsns;
 144         int             si_chkops;      /* checkpointing info */
 145         int             si_chktime;
 146         int             si_numops;      /* number of ops since last checkpoint */
 147         int             si_nopres;      /* Skip present phase */
 148         int             si_usehint;     /* use reload hint */
 149         int             si_active;      /* True if there are active mods */
 150         int             si_dirty;       /* True if the context is dirty, i.e changes
 151                                                  * have been made without updating the csn. */
 152         time_t  si_chklast;     /* time of last checkpoint */
 153         Avlnode *si_mods;       /* entries being modified */
 154         sessionlog      *si_logs;
 155         ldap_pvt_thread_rdwr_t  si_csn_rwlock;
 156         ldap_pvt_thread_mutex_t si_ops_mutex;
 157         ldap_pvt_thread_mutex_t si_mods_mutex;
 158         ldap_pvt_thread_mutex_t si_resp_mutex;
 159 } syncprov_info_t;
 160
 161 typedef struct opcookie {
 162         slap_overinst *son;
 163         syncmatches *smatches;
 164         modtarget *smt;
 165         Entry *se;
 166         struct berval sdn;      /* DN of entry, for deletes */
 167         struct berval sndn;
 168         struct berval suuid;    /* UUID of entry */
 169         struct berval sctxcsn;
 170         short osid;     /* sid of op csn */
 171         short rsid;     /* sid of relay */
 172         short sreference;       /* Is the entry a reference? */
 173         syncres ssres;
 174 } opcookie;
 175
 176 typedef struct fbase_cookie {
 177         struct berval *fdn;     /* DN of a modified entry, for scope testing */
 178         syncops *fss;   /* persistent search we're testing against */
 179         int fbase;      /* if TRUE we found the search base and it's still valid */
 180         int fscope;     /* if TRUE then fdn is within the psearch scope */
 181 } fbase_cookie;
 182
 183 static AttributeName csn_anlist[3];
 184 static AttributeName uuid_anlist[2];
 185
 186 /* Build a LDAPsync intermediate state control */
 187 static int
 188 syncprov_state_ctrl(
 189         Operation       *op,
 190         SlapReply       *rs,
 191         Entry           *e,
 192         int             entry_sync_state,
 193         LDAPControl     **ctrls,
 194         int             num_ctrls,
 195         int             send_cookie,
 196         struct berval   *cookie )
 197 {
 198         Attribute* a;
 199         int ret;
 200
 201         BerElementBuffer berbuf;
 202         BerElement *ber = (BerElement *)&berbuf;
 203         LDAPControl *cp;
 204         struct berval bv;
 205         struct berval   entryuuid_bv = BER_BVNULL;
 206
 207         ber_init2( ber, 0, LBER_USE_DER );
 208         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 209
 210         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 211                 AttributeDescription *desc = a->a_desc;
 212                 if ( desc == slap_schema.si_ad_entryUUID ) {
 213                         entryuuid_bv = a->a_nvals[0];
 214                         break;
 215                 }
 216         }
 217
 218         /* FIXME: what if entryuuid is NULL or empty ? */
 219
 220         if ( send_cookie && cookie ) {
 221                 ber_printf( ber, "{eOON}",
 222                         entry_sync_state, &entryuuid_bv, cookie );
 223         } else {
 224                 ber_printf( ber, "{eON}",
 225                         entry_sync_state, &entryuuid_bv );
 226         }
 227
 228         ret = ber_flatten2( ber, &bv, 0 );
 229         if ( ret == 0 ) {
 230                 cp = op->o_tmpalloc( sizeof( LDAPControl ) + bv.bv_len, op->o_tmpmemctx );
 231                 cp->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 232                 cp->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 233                 cp->ldctl_value.bv_val = (char *)&cp[1];
 234                 cp->ldctl_value.bv_len = bv.bv_len;
 235                 AC_MEMCPY( cp->ldctl_value.bv_val, bv.bv_val, bv.bv_len );
 236                 ctrls[num_ctrls] = cp;
 237         }
 238         ber_free_buf( ber );
 239
 240         if ( ret < 0 ) {
 241                 Debug( LDAP_DEBUG_TRACE,
 242                         "slap_build_sync_ctrl: ber_flatten2 failed (%d)\n",
 243                         ret, 0, 0 );
 244                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 245                 return LDAP_OTHER;
 246         }
 247
 248         return LDAP_SUCCESS;
 249 }
 250
 251 /* Build a LDAPsync final state control */
 252 static int
 253 syncprov_done_ctrl(
 254         Operation       *op,
 255         SlapReply       *rs,
 256         LDAPControl     **ctrls,
 257         int                     num_ctrls,
 258         int                     send_cookie,
 259         struct berval *cookie,
 260         int                     refreshDeletes )
 261 {
 262         int ret;
 263         BerElementBuffer berbuf;
 264         BerElement *ber = (BerElement *)&berbuf;
 265         LDAPControl *cp;
 266         struct berval bv;
 267
 268         ber_init2( ber, NULL, LBER_USE_DER );
 269         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 270
 271         ber_printf( ber, "{" );
 272         if ( send_cookie && cookie ) {
 273                 ber_printf( ber, "O", cookie );
 274         }
 275         if ( refreshDeletes == LDAP_SYNC_REFRESH_DELETES ) {
 276                 ber_printf( ber, "b", refreshDeletes );
 277         }
 278         ber_printf( ber, "N}" );
 279
 280         ret = ber_flatten2( ber, &bv, 0 );
 281         if ( ret == 0 ) {
 282                 cp = op->o_tmpalloc( sizeof( LDAPControl ) + bv.bv_len, op->o_tmpmemctx );
 283                 cp->ldctl_oid = LDAP_CONTROL_SYNC_DONE;
 284                 cp->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 285                 cp->ldctl_value.bv_val = (char *)&cp[1];
 286                 cp->ldctl_value.bv_len = bv.bv_len;
 287                 AC_MEMCPY( cp->ldctl_value.bv_val, bv.bv_val, bv.bv_len );
 288                 ctrls[num_ctrls] = cp;
 289         }
 290
 291         ber_free_buf( ber );
 292
 293         if ( ret < 0 ) {
 294                 Debug( LDAP_DEBUG_TRACE,
 295                         "syncprov_done_ctrl: ber_flatten2 failed (%d)\n",
 296                         ret, 0, 0 );
 297                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 298                 return LDAP_OTHER;
 299         }
 300
 301         return LDAP_SUCCESS;
 302 }
 303
 304 static int
 305 syncprov_sendinfo(
 306         Operation       *op,
 307         SlapReply       *rs,
 308         int                     type,
 309         struct berval *cookie,
 310         int                     refreshDone,
 311         BerVarray       syncUUIDs,
 312         int                     refreshDeletes )
 313 {
 314         BerElementBuffer berbuf;
 315         BerElement *ber = (BerElement *)&berbuf;
 316         struct berval rspdata;
 317
 318         int ret;
 319
 320         ber_init2( ber, NULL, LBER_USE_DER );
 321         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 322
 323         if ( type ) {
 324                 switch ( type ) {
 325                 case LDAP_TAG_SYNC_NEW_COOKIE:
 326                         ber_printf( ber, "tO", type, cookie );
 327                         break;
 328                 case LDAP_TAG_SYNC_REFRESH_DELETE:
 329                 case LDAP_TAG_SYNC_REFRESH_PRESENT:
 330                         ber_printf( ber, "t{", type );
 331                         if ( cookie ) {
 332                                 ber_printf( ber, "O", cookie );
 333                         }
 334                         if ( refreshDone == 0 ) {
 335                                 ber_printf( ber, "b", refreshDone );
 336                         }
 337                         ber_printf( ber, "N}" );
 338                         break;
 339                 case LDAP_TAG_SYNC_ID_SET:
 340                         ber_printf( ber, "t{", type );
 341                         if ( cookie ) {
 342                                 ber_printf( ber, "O", cookie );
 343                         }
 344                         if ( refreshDeletes == 1 ) {
 345                                 ber_printf( ber, "b", refreshDeletes );
 346                         }
 347                         ber_printf( ber, "[W]", syncUUIDs );
 348                         ber_printf( ber, "N}" );
 349                         break;
 350                 default:
 351                         Debug( LDAP_DEBUG_TRACE,
 352                                 "syncprov_sendinfo: invalid syncinfo type (%d)\n",
 353                                 type, 0, 0 );
 354                         return LDAP_OTHER;
 355                 }
 356         }
 357
 358         ret = ber_flatten2( ber, &rspdata, 0 );
 359
 360         if ( ret < 0 ) {
 361                 Debug( LDAP_DEBUG_TRACE,
 362                         "syncprov_sendinfo: ber_flatten2 failed (%d)\n",
 363                         ret, 0, 0 );
 364                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 365                 return LDAP_OTHER;
 366         }
 367
 368         rs->sr_rspoid = LDAP_SYNC_INFO;
 369         rs->sr_rspdata = &rspdata;
 370         send_ldap_intermediate( op, rs );
 371         rs->sr_rspdata = NULL;
 372         ber_free_buf( ber );
 373
 374         return LDAP_SUCCESS;
 375 }
 376
 377 /* Find a modtarget in an AVL tree */
 378 static int
 379 sp_avl_cmp( const void *c1, const void *c2 )
 380 {
 381         const modtarget *m1, *m2;
 382         int rc;
 383
 384         m1 = c1; m2 = c2;
 385         rc = m1->mt_dn.bv_len - m2->mt_dn.bv_len;
 386
 387         if ( rc ) return rc;
 388         return ber_bvcmp( &m1->mt_dn, &m2->mt_dn );
 389 }
 390
 391 /* syncprov_findbase:
 392  *   finds the true DN of the base of a search (with alias dereferencing) and
 393  * checks to make sure the base entry doesn't get replaced with a different
 394  * entry (e.g., swapping trees via ModDN, or retargeting an alias). If a
 395  * change is detected, any persistent search on this base must be terminated /
 396  * reloaded.
 397  *   On the first call, we just save the DN and entryID. On subsequent calls
 398  * we compare the DN and entryID with the saved values.
 399  */
 400 static int
 401 findbase_cb( Operation *op, SlapReply *rs )
 402 {
 403         slap_callback *sc = op->o_callback;
 404
 405         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 406                 fbase_cookie *fc = sc->sc_private;
 407
 408                 /* If no entryID, we're looking for the first time.
 409                  * Just store whatever we got.
 410                  */
 411                 if ( fc->fss->s_eid == NOID ) {
 412                         fc->fbase = 2;
 413                         fc->fss->s_eid = rs->sr_entry->e_id;
 414                         ber_dupbv( &fc->fss->s_base, &rs->sr_entry->e_nname );
 415
 416                 } else if ( rs->sr_entry->e_id == fc->fss->s_eid &&
 417                         dn_match( &rs->sr_entry->e_nname, &fc->fss->s_base )) {
 418
 419                 /* OK, the DN is the same and the entryID is the same. */
 420                         fc->fbase = 1;
 421                 }
 422         }
 423         if ( rs->sr_err != LDAP_SUCCESS ) {
 424                 Debug( LDAP_DEBUG_ANY, "findbase failed! %d\n", rs->sr_err,0,0 );
 425         }
 426         return LDAP_SUCCESS;
 427 }
 428
 429 static Filter generic_filter = { LDAP_FILTER_PRESENT, { 0 }, NULL };
 430 static struct berval generic_filterstr = BER_BVC("(objectclass=*)");
 431
 432 static int
 433 syncprov_findbase( Operation *op, fbase_cookie *fc )
 434 {
 435         /* Use basic parameters from syncrepl search, but use
 436          * current op's threadctx / tmpmemctx
 437          */
 438         ldap_pvt_thread_mutex_lock( &fc->fss->s_mutex );
 439         if ( fc->fss->s_flags & PS_FIND_BASE ) {
 440                 slap_callback cb = {0};
 441                 Operation fop;
 442                 SlapReply frs = { REP_RESULT };
 443                 int rc;
 444
 445                 fc->fss->s_flags ^= PS_FIND_BASE;
 446                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 447
 448                 fop = *fc->fss->s_op;
 449
 450                 fop.o_bd = fop.o_bd->bd_self;
 451                 fop.o_hdr = op->o_hdr;
 452                 fop.o_time = op->o_time;
 453                 fop.o_tincr = op->o_tincr;
 454                 fop.o_extra = op->o_extra;
 455
 456                 cb.sc_response = findbase_cb;
 457                 cb.sc_private = fc;
 458
 459                 fop.o_sync_mode = 0;    /* turn off sync mode */
 460                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 461                 fop.o_callback = &cb;
 462                 fop.o_tag = LDAP_REQ_SEARCH;
 463                 fop.ors_scope = LDAP_SCOPE_BASE;
 464                 fop.ors_limit = NULL;
 465                 fop.ors_slimit = 1;
 466                 fop.ors_tlimit = SLAP_NO_LIMIT;
 467                 fop.ors_attrs = slap_anlist_no_attrs;
 468                 fop.ors_attrsonly = 1;
 469                 fop.ors_filter = &generic_filter;
 470                 fop.ors_filterstr = generic_filterstr;
 471
 472                 rc = fop.o_bd->be_search( &fop, &frs );
 473         } else {
 474                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 475                 fc->fbase = 1;
 476         }
 477
 478         /* After the first call, see if the fdn resides in the scope */
 479         if ( fc->fbase == 1 ) {
 480                 switch ( fc->fss->s_op->ors_scope ) {
 481                 case LDAP_SCOPE_BASE:
 482                         fc->fscope = dn_match( fc->fdn, &fc->fss->s_base );
 483                         break;
 484                 case LDAP_SCOPE_ONELEVEL: {
 485                         struct berval pdn;
 486                         dnParent( fc->fdn, &pdn );
 487                         fc->fscope = dn_match( &pdn, &fc->fss->s_base );
 488                         break; }
 489                 case LDAP_SCOPE_SUBTREE:
 490                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base );
 491                         break;
 492                 case LDAP_SCOPE_SUBORDINATE:
 493                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base ) &&
 494                                 !dn_match( fc->fdn, &fc->fss->s_base );
 495                         break;
 496                 }
 497         }
 498
 499         if ( fc->fbase )
 500                 return LDAP_SUCCESS;
 501
 502         /* If entryID has changed, then the base of this search has
 503          * changed. Invalidate the psearch.
 504          */
 505         return LDAP_NO_SUCH_OBJECT;
 506 }
 507
 508 /* syncprov_findcsn:
 509  *   This function has three different purposes, but they all use a search
 510  * that filters on entryCSN so they're combined here.
 511  * 1: at startup time, after a contextCSN has been read from the database,
 512  * we search for all entries with CSN >= contextCSN in case the contextCSN
 513  * was not checkpointed at the previous shutdown.
 514  *
 515  * 2: when the current contextCSN is known and we have a sync cookie, we search
 516  * for one entry with CSN = the cookie CSN. If not found, try <= cookie CSN.
 517  * If an entry is found, the cookie CSN is valid, otherwise it is stale.
 518  *
 519  * 3: during a refresh phase, we search for all entries with CSN <= the cookie
 520  * CSN, and generate Present records for them. We always collect this result
 521  * in SyncID sets, even if there's only one match.
 522  */
 523 typedef enum find_csn_t {
 524         FIND_MAXCSN     = 1,
 525         FIND_CSN        = 2,
 526         FIND_PRESENT    = 3
 527 } find_csn_t;
 528
 529 static int
 530 findmax_cb( Operation *op, SlapReply *rs )
 531 {
 532         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 533                 struct berval *maxcsn = op->o_callback->sc_private;
 534                 Attribute *a = attr_find( rs->sr_entry->e_attrs,
 535                         slap_schema.si_ad_entryCSN );
 536
 537                 if ( a && ber_bvcmp( &a->a_vals[0], maxcsn ) > 0 &&
 538                         slap_parse_csn_sid( &a->a_vals[0] ) == slap_serverID ) {
 539                         maxcsn->bv_len = a->a_vals[0].bv_len;
 540                         strcpy( maxcsn->bv_val, a->a_vals[0].bv_val );
 541                 }
 542         }
 543         return LDAP_SUCCESS;
 544 }
 545
 546 static int
 547 findcsn_cb( Operation *op, SlapReply *rs )
 548 {
 549         slap_callback *sc = op->o_callback;
 550
 551         /* We just want to know that at least one exists, so it's OK if
 552          * we exceed the unchecked limit.
 553          */
 554         if ( rs->sr_err == LDAP_ADMINLIMIT_EXCEEDED ||
 555                 (rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS )) {
 556                 sc->sc_private = (void *)1;
 557         }
 558         return LDAP_SUCCESS;
 559 }
 560
 561 /* Build a list of entryUUIDs for sending in a SyncID set */
 562
 563 #define UUID_LEN        16
 564
 565 typedef struct fpres_cookie {
 566         int num;
 567         BerVarray uuids;
 568         char *last;
 569 } fpres_cookie;
 570
 571 static int
 572 findpres_cb( Operation *op, SlapReply *rs )
 573 {
 574         slap_callback *sc = op->o_callback;
 575         fpres_cookie *pc = sc->sc_private;
 576         Attribute *a;
 577         int ret = SLAP_CB_CONTINUE;
 578
 579         switch ( rs->sr_type ) {
 580         case REP_SEARCH:
 581                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryUUID );
 582                 if ( a ) {
 583                         pc->uuids[pc->num].bv_val = pc->last;
 584                         AC_MEMCPY( pc->uuids[pc->num].bv_val, a->a_nvals[0].bv_val,
 585                                 pc->uuids[pc->num].bv_len );
 586                         pc->num++;
 587                         pc->last = pc->uuids[pc->num].bv_val;
 588                         pc->uuids[pc->num].bv_val = NULL;
 589                 }
 590                 ret = LDAP_SUCCESS;
 591                 if ( pc->num != SLAP_SYNCUUID_SET_SIZE )
 592                         break;
 593                 /* FALLTHRU */
 594         case REP_RESULT:
 595                 ret = rs->sr_err;
 596                 if ( pc->num ) {
 597                         ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 598                                 0, pc->uuids, 0 );
 599                         pc->uuids[pc->num].bv_val = pc->last;
 600                         pc->num = 0;
 601                         pc->last = pc->uuids[0].bv_val;
 602                 }
 603                 break;
 604         default:
 605                 break;
 606         }
 607         return ret;
 608 }
 609
 610 static int
 611 syncprov_findcsn( Operation *op, find_csn_t mode, struct berval *csn )
 612 {
 613         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 614         syncprov_info_t         *si = on->on_bi.bi_private;
 615
 616         slap_callback cb = {0};
 617         Operation fop;
 618         SlapReply frs = { REP_RESULT };
 619         char buf[LDAP_PVT_CSNSTR_BUFSIZE + STRLENOF("(entryCSN<=)")];
 620         char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
 621         struct berval maxcsn;
 622         Filter cf;
 623         AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
 624         fpres_cookie pcookie;
 625         sync_control *srs = NULL;
 626         struct slap_limits_set fc_limits;
 627         int i, rc = LDAP_SUCCESS, findcsn_retry = 1;
 628         int maxid;
 629
 630         if ( mode != FIND_MAXCSN ) {
 631                 srs = op->o_controls[slap_cids.sc_LDAPsync];
 632         }
 633
 634         fop = *op;
 635         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync_mode */
 636         /* We want pure entries, not referrals */
 637         fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 638
 639         cf.f_ava = &eq;
 640         cf.f_av_desc = slap_schema.si_ad_entryCSN;
 641         BER_BVZERO( &cf.f_av_value );
 642         cf.f_next = NULL;
 643
 644         fop.o_callback = &cb;
 645         fop.ors_limit = NULL;
 646         fop.ors_tlimit = SLAP_NO_LIMIT;
 647         fop.ors_filter = &cf;
 648         fop.ors_filterstr.bv_val = buf;
 649
 650 again:
 651         switch( mode ) {
 652         case FIND_MAXCSN:
 653                 cf.f_choice = LDAP_FILTER_GE;
 654                 /* If there are multiple CSNs, use the one with our serverID */
 655                 for ( i=0; i<si->si_numcsns; i++) {
 656                         if ( slap_serverID == si->si_sids[i] ) {
 657                                 maxid = i;
 658                                 break;
 659                         }
 660                 }
 661                 if ( i == si->si_numcsns ) {
 662                         /* No match: this is multimaster, and none of the content in the DB
 663                          * originated locally. Treat like no CSN.
 664                          */
 665                         return LDAP_NO_SUCH_OBJECT;
 666                 }
 667                 cf.f_av_value = si->si_ctxcsn[maxid];
 668                 fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 669                         "(entryCSN>=%s)", cf.f_av_value.bv_val );
 670                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 671                         return LDAP_OTHER;
 672                 }
 673                 fop.ors_attrsonly = 0;
 674                 fop.ors_attrs = csn_anlist;
 675                 fop.ors_slimit = SLAP_NO_LIMIT;
 676                 cb.sc_private = &maxcsn;
 677                 cb.sc_response = findmax_cb;
 678                 strcpy( cbuf, cf.f_av_value.bv_val );
 679                 maxcsn.bv_val = cbuf;
 680                 maxcsn.bv_len = cf.f_av_value.bv_len;
 681                 break;
 682         case FIND_CSN:
 683                 if ( BER_BVISEMPTY( &cf.f_av_value )) {
 684                         cf.f_av_value = *csn;
 685                 }
 686                 fop.o_dn = op->o_bd->be_rootdn;
 687                 fop.o_ndn = op->o_bd->be_rootndn;
 688                 fop.o_req_dn = op->o_bd->be_suffix[0];
 689                 fop.o_req_ndn = op->o_bd->be_nsuffix[0];
 690                 /* Look for exact match the first time */
 691                 if ( findcsn_retry ) {
 692                         cf.f_choice = LDAP_FILTER_EQUALITY;
 693                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 694                                 "(entryCSN=%s)", cf.f_av_value.bv_val );
 695                 /* On retry, look for <= */
 696                 } else {
 697                         cf.f_choice = LDAP_FILTER_LE;
 698                         fop.ors_limit = &fc_limits;
 699                         memset( &fc_limits, 0, sizeof( fc_limits ));
 700                         fc_limits.lms_s_unchecked = 1;
 701                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 702                                 "(entryCSN<=%s)", cf.f_av_value.bv_val );
 703                 }
 704                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 705                         return LDAP_OTHER;
 706                 }
 707                 fop.ors_attrsonly = 1;
 708                 fop.ors_attrs = slap_anlist_no_attrs;
 709                 fop.ors_slimit = 1;
 710                 cb.sc_private = NULL;
 711                 cb.sc_response = findcsn_cb;
 712                 break;
 713         case FIND_PRESENT:
 714                 fop.ors_filter = op->ors_filter;
 715                 fop.ors_filterstr = op->ors_filterstr;
 716                 fop.ors_attrsonly = 0;
 717                 fop.ors_attrs = uuid_anlist;
 718                 fop.ors_slimit = SLAP_NO_LIMIT;
 719                 cb.sc_private = &pcookie;
 720                 cb.sc_response = findpres_cb;
 721                 pcookie.num = 0;
 722
 723                 /* preallocate storage for a full set */
 724                 pcookie.uuids = op->o_tmpalloc( (SLAP_SYNCUUID_SET_SIZE+1) *
 725                         sizeof(struct berval) + SLAP_SYNCUUID_SET_SIZE * UUID_LEN,
 726                         op->o_tmpmemctx );
 727                 pcookie.last = (char *)(pcookie.uuids + SLAP_SYNCUUID_SET_SIZE+1);
 728                 pcookie.uuids[0].bv_val = pcookie.last;
 729                 pcookie.uuids[0].bv_len = UUID_LEN;
 730                 for (i=1; i<SLAP_SYNCUUID_SET_SIZE; i++) {
 731                         pcookie.uuids[i].bv_val = pcookie.uuids[i-1].bv_val + UUID_LEN;
 732                         pcookie.uuids[i].bv_len = UUID_LEN;
 733                 }
 734                 break;
 735         }
 736
 737         fop.o_bd->bd_info = (BackendInfo *)on->on_info;
 738         fop.o_bd->be_search( &fop, &frs );
 739         fop.o_bd->bd_info = (BackendInfo *)on;
 740
 741         switch( mode ) {
 742         case FIND_MAXCSN:
 743                 if ( ber_bvcmp( &si->si_ctxcsn[maxid], &maxcsn )) {
 744 #ifdef CHECK_CSN
 745                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
 746                         assert( !syn->ssyn_validate( syn, &maxcsn ));
 747 #endif
 748                         ber_bvreplace( &si->si_ctxcsn[maxid], &maxcsn );
 749                         si->si_numops++;        /* ensure a checkpoint */
 750                 }
 751                 break;
 752         case FIND_CSN:
 753                 /* If matching CSN was not found, invalidate the context. */
 754                 if ( !cb.sc_private ) {
 755                         /* If we didn't find an exact match, then try for <= */
 756                         if ( findcsn_retry ) {
 757                                 findcsn_retry = 0;
 758                                 rs_reinit( &frs, REP_RESULT );
 759                                 goto again;
 760                         }
 761                         rc = LDAP_NO_SUCH_OBJECT;
 762                 }
 763                 break;
 764         case FIND_PRESENT:
 765                 op->o_tmpfree( pcookie.uuids, op->o_tmpmemctx );
 766                 break;
 767         }
 768
 769         return rc;
 770 }
 771
 772 static void free_resinfo( syncres *sr )
 773 {
 774         syncres **st;
 775         ldap_pvt_thread_mutex_lock( &sr->s_info->ri_mutex );
 776         for (st = &sr->s_info->ri_list; *st; st = &(*st)->s_rilist) {
 777                 if (*st == sr) {
 778                         *st = sr->s_rilist;
 779                         break;
 780                 }
 781         }
 782         ldap_pvt_thread_mutex_unlock( &sr->s_info->ri_mutex );
 783         if ( !sr->s_info->ri_list ) {
 784                 ldap_pvt_thread_mutex_destroy( &sr->s_info->ri_mutex );
 785                 if ( sr->s_info->ri_e )
 786                         entry_free( sr->s_info->ri_e );
 787                 if ( !BER_BVISNULL( &sr->s_info->ri_cookie ))
 788                         ch_free( sr->s_info->ri_cookie.bv_val );
 789                 ch_free( sr->s_info );
 790         }
 791 }
 792
 793 static int
 794 syncprov_free_syncop( syncops *so )
 795 {
 796         syncres *sr, *srnext;
 797         GroupAssertion *ga, *gnext;
 798
 799         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 800         /* already being freed, or still in use */
 801         if ( !so->s_inuse || --so->s_inuse > 0 ) {
 802                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 803                 return 0;
 804         }
 805         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 806         if ( so->s_flags & PS_IS_DETACHED ) {
 807                 filter_free( so->s_op->ors_filter );
 808                 for ( ga = so->s_op->o_groups; ga; ga=gnext ) {
 809                         gnext = ga->ga_next;
 810                         ch_free( ga );
 811                 }
 812                 ch_free( so->s_op );
 813         }
 814         ch_free( so->s_base.bv_val );
 815         for ( sr=so->s_res; sr; sr=srnext ) {
 816                 srnext = sr->s_next;
 817                 free_resinfo( sr );
 818                 ch_free( sr );
 819         }
 820         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 821         ch_free( so );
 822         return 1;
 823 }
 824
 825 /* Send a persistent search response */
 826 static int
 827 syncprov_sendresp( Operation *op, resinfo *ri, syncops *so, int mode )
 828 {
 829         SlapReply rs = { REP_SEARCH };
 830         struct berval cookie, csns[2];
 831         Entry e_uuid = {0};
 832         Attribute a_uuid = {0};
 833
 834         if ( so->s_op->o_abandon )
 835                 return SLAPD_ABANDON;
 836
 837         rs.sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2, op->o_tmpmemctx );
 838         rs.sr_ctrls[1] = NULL;
 839         rs.sr_flags = REP_CTRLS_MUSTBEFREED;
 840         csns[0] = ri->ri_csn;
 841         BER_BVZERO( &csns[1] );
 842         slap_compose_sync_cookie( op, &cookie, csns, so->s_rid, slap_serverID ? slap_serverID : -1 );
 843
 844 #ifdef LDAP_DEBUG
 845         if ( so->s_sid > 0 ) {
 846                 Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: to=%03x, cookie=%s\n",
 847                         so->s_sid, cookie.bv_val, 0 );
 848         } else {
 849                 Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: cookie=%s\n",
 850                         cookie.bv_val, 0, 0 );
 851         }
 852 #endif
 853
 854         e_uuid.e_attrs = &a_uuid;
 855         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 856         a_uuid.a_nvals = &ri->ri_uuid;
 857         rs.sr_err = syncprov_state_ctrl( op, &rs, &e_uuid,
 858                 mode, rs.sr_ctrls, 0, 1, &cookie );
 859         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
 860
 861         rs.sr_entry = &e_uuid;
 862         if ( mode == LDAP_SYNC_ADD || mode == LDAP_SYNC_MODIFY ) {
 863                 e_uuid = *ri->ri_e;
 864                 e_uuid.e_private = NULL;
 865         }
 866
 867         switch( mode ) {
 868         case LDAP_SYNC_ADD:
 869                 if ( ri->ri_isref && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 870                         rs.sr_ref = get_entry_referrals( op, rs.sr_entry );
 871                         rs.sr_err = send_search_reference( op, &rs );
 872                         ber_bvarray_free( rs.sr_ref );
 873                         break;
 874                 }
 875                 /* fallthru */
 876         case LDAP_SYNC_MODIFY:
 877                 rs.sr_attrs = op->ors_attrs;
 878                 rs.sr_err = send_search_entry( op, &rs );
 879                 break;
 880         case LDAP_SYNC_DELETE:
 881                 e_uuid.e_attrs = NULL;
 882                 e_uuid.e_name = ri->ri_dn;
 883                 e_uuid.e_nname = ri->ri_ndn;
 884                 if ( ri->ri_isref && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 885                         struct berval bv = BER_BVNULL;
 886                         rs.sr_ref = &bv;
 887                         rs.sr_err = send_search_reference( op, &rs );
 888                 } else {
 889                         rs.sr_err = send_search_entry( op, &rs );
 890                 }
 891                 break;
 892         default:
 893                 assert(0);
 894         }
 895         return rs.sr_err;
 896 }
 897
 898 static void
 899 syncprov_qstart( syncops *so );
 900
 901 /* Play back queued responses */
 902 static int
 903 syncprov_qplay( Operation *op, syncops *so )
 904 {
 905         slap_overinst *on = LDAP_SLIST_FIRST(&so->s_op->o_extra)->oe_key;
 906         syncres *sr;
 907         int rc = 0;
 908
 909         do {
 910                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 911                 sr = so->s_res;
 912                 /* Exit loop with mutex held */
 913                 if ( !sr )
 914                         break;
 915                 so->s_res = sr->s_next;
 916                 if ( !so->s_res )
 917                         so->s_restail = NULL;
 918                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 919
 920                 if ( !so->s_op->o_abandon ) {
 921
 922                         if ( sr->s_mode == LDAP_SYNC_NEW_COOKIE ) {
 923                                 SlapReply rs = { REP_INTERMEDIATE };
 924
 925                                 rc = syncprov_sendinfo( op, &rs, LDAP_TAG_SYNC_NEW_COOKIE,
 926                                         &sr->s_info->ri_cookie, 0, NULL, 0 );
 927                         } else {
 928                                 rc = syncprov_sendresp( op, sr->s_info, so, sr->s_mode );
 929                         }
 930                 }
 931
 932                 free_resinfo( sr );
 933                 ch_free( sr );
 934
 935                 if ( so->s_op->o_abandon )
 936                         continue;
 937
 938                 /* Exit loop with mutex held */
 939                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 940                 break;
 941
 942         } while (1);
 943
 944         /* We now only send one change at a time, to prevent one
 945          * psearch from hogging all the CPU. Resubmit this task if
 946          * there are more responses queued and no errors occurred.
 947          */
 948
 949         if ( rc == 0 && so->s_res ) {
 950                 syncprov_qstart( so );
 951         } else {
 952                 so->s_flags ^= PS_TASK_QUEUED;
 953         }
 954
 955         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 956         return rc;
 957 }
 958
 959 /* task for playing back queued responses */
 960 static void *
 961 syncprov_qtask( void *ctx, void *arg )
 962 {
 963         syncops *so = arg;
 964         OperationBuffer opbuf;
 965         Operation *op;
 966         BackendDB be;
 967         int rc;
 968
 969         op = &opbuf.ob_op;
 970         *op = *so->s_op;
 971         op->o_hdr = &opbuf.ob_hdr;
 972         op->o_controls = opbuf.ob_controls;
 973         memset( op->o_controls, 0, sizeof(opbuf.ob_controls) );
 974         op->o_sync = SLAP_CONTROL_IGNORED;
 975
 976         *op->o_hdr = *so->s_op->o_hdr;
 977
 978         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx, 1);
 979         op->o_tmpmfuncs = &slap_sl_mfuncs;
 980         op->o_threadctx = ctx;
 981
 982         /* syncprov_qplay expects a fake db */
 983         be = *so->s_op->o_bd;
 984         be.be_flags |= SLAP_DBFLAG_OVERLAY;
 985         op->o_bd = &be;
 986         LDAP_SLIST_FIRST(&op->o_extra) = NULL;
 987         op->o_callback = NULL;
 988
 989         rc = syncprov_qplay( op, so );
 990
 991         /* decrement use count... */
 992         syncprov_free_syncop( so );
 993
 994         return NULL;
 995 }
 996
 997 /* Start the task to play back queued psearch responses */
 998 static void
 999 syncprov_qstart( syncops *so )
1000 {
1001         so->s_flags |= PS_TASK_QUEUED;
1002         so->s_inuse++;
1003         ldap_pvt_thread_pool_submit( &connection_pool,
1004                 syncprov_qtask, so );
1005 }
1006
1007 /* Queue a persistent search response */
1008 static int
1009 syncprov_qresp( opcookie *opc, syncops *so, int mode )
1010 {
1011         syncres *sr;
1012         resinfo *ri;
1013         int srsize;
1014         struct berval csn = opc->sctxcsn;
1015
1016         sr = ch_malloc( sizeof( syncres ));
1017         sr->s_next = NULL;
1018         sr->s_mode = mode;
1019         if ( !opc->ssres.s_info ) {
1020
1021                 srsize = sizeof( resinfo );
1022                 if ( csn.bv_len )
1023                         srsize += csn.bv_len + 1;
1024
1025                 if ( opc->se ) {
1026                         Attribute *a;
1027                         ri = ch_malloc( srsize );
1028                         ri->ri_dn = opc->se->e_name;
1029                         ri->ri_ndn = opc->se->e_nname;
1030                         a = attr_find( opc->se->e_attrs, slap_schema.si_ad_entryUUID );
1031                         if ( a )
1032                                 ri->ri_uuid = a->a_nvals[0];
1033                         else
1034                                 ri->ri_uuid.bv_len = 0;
1035                         if ( csn.bv_len ) {
1036                                 ri->ri_csn.bv_val = (char *)(ri + 1);
1037                                 ri->ri_csn.bv_len = csn.bv_len;
1038                                 memcpy( ri->ri_csn.bv_val, csn.bv_val, csn.bv_len );
1039                                 ri->ri_csn.bv_val[csn.bv_len] = '\0';
1040                         } else {
1041                                 ri->ri_csn.bv_val = NULL;
1042                         }
1043                 } else {
1044                         srsize += opc->suuid.bv_len +
1045                                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1;
1046                         ri = ch_malloc( srsize );
1047                         ri->ri_dn.bv_val = (char *)(ri + 1);
1048                         ri->ri_dn.bv_len = opc->sdn.bv_len;
1049                         ri->ri_ndn.bv_val = lutil_strcopy( ri->ri_dn.bv_val,
1050                                 opc->sdn.bv_val ) + 1;
1051                         ri->ri_ndn.bv_len = opc->sndn.bv_len;
1052                         ri->ri_uuid.bv_val = lutil_strcopy( ri->ri_ndn.bv_val,
1053                                 opc->sndn.bv_val ) + 1;
1054                         ri->ri_uuid.bv_len = opc->suuid.bv_len;
1055                         AC_MEMCPY( ri->ri_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1056                         if ( csn.bv_len ) {
1057                                 ri->ri_csn.bv_val = ri->ri_uuid.bv_val + ri->ri_uuid.bv_len;
1058                                 memcpy( ri->ri_csn.bv_val, csn.bv_val, csn.bv_len );
1059                                 ri->ri_csn.bv_val[csn.bv_len] = '\0';
1060                         } else {
1061                                 ri->ri_csn.bv_val = NULL;
1062                         }
1063                 }
1064                 ri->ri_list = &opc->ssres;
1065                 ri->ri_e = opc->se;
1066                 ri->ri_csn.bv_len = csn.bv_len;
1067                 ri->ri_isref = opc->sreference;
1068                 BER_BVZERO( &ri->ri_cookie );
1069                 ldap_pvt_thread_mutex_init( &ri->ri_mutex );
1070                 opc->se = NULL;
1071                 opc->ssres.s_info = ri;
1072         }
1073         ri = opc->ssres.s_info;
1074         sr->s_info = ri;
1075         ldap_pvt_thread_mutex_lock( &ri->ri_mutex );
1076         sr->s_rilist = ri->ri_list;
1077         ri->ri_list = sr;
1078         if ( mode == LDAP_SYNC_NEW_COOKIE && BER_BVISNULL( &ri->ri_cookie )) {
1079                 syncprov_info_t *si = opc->son->on_bi.bi_private;
1080
1081                 slap_compose_sync_cookie( NULL, &ri->ri_cookie, si->si_ctxcsn,
1082                         so->s_rid, slap_serverID ? slap_serverID : -1);
1083         }
1084         ldap_pvt_thread_mutex_unlock( &ri->ri_mutex );
1085
1086         ldap_pvt_thread_mutex_lock( &so->s_mutex );
1087         if ( !so->s_res ) {
1088                 so->s_res = sr;
1089         } else {
1090                 so->s_restail->s_next = sr;
1091         }
1092         so->s_restail = sr;
1093
1094         /* If the base of the psearch was modified, check it next time round */
1095         if ( so->s_flags & PS_WROTE_BASE ) {
1096                 so->s_flags ^= PS_WROTE_BASE;
1097                 so->s_flags |= PS_FIND_BASE;
1098         }
1099         if (( so->s_flags & (PS_IS_DETACHED|PS_TASK_QUEUED)) == PS_IS_DETACHED ) {
1100                 syncprov_qstart( so );
1101         }
1102         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
1103         return LDAP_SUCCESS;
1104 }
1105
1106 static int
1107 syncprov_drop_psearch( syncops *so, int lock )
1108 {
1109         if ( so->s_flags & PS_IS_DETACHED ) {
1110                 if ( lock )
1111                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
1112                 so->s_op->o_conn->c_n_ops_executing--;
1113                 so->s_op->o_conn->c_n_ops_completed++;
1114                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, Operation,
1115                         o_next );
1116                 if ( lock )
1117                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
1118         }
1119         return syncprov_free_syncop( so );
1120 }
1121
1122 static int
1123 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
1124 {
1125         slap_callback *sc = op->o_callback;
1126         op->o_callback = sc->sc_next;
1127         syncprov_drop_psearch( sc->sc_private, 0 );
1128         op->o_tmpfree( sc, op->o_tmpmemctx );
1129         return 0;
1130 }
1131
1132 static int
1133 syncprov_op_abandon( Operation *op, SlapReply *rs )
1134 {
1135         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1136         syncprov_info_t         *si = on->on_bi.bi_private;
1137         syncops *so, *soprev;
1138
1139         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1140         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
1141                 soprev=so, so=so->s_next ) {
1142                 if ( so->s_op->o_connid == op->o_connid &&
1143                         so->s_op->o_msgid == op->orn_msgid ) {
1144                                 so->s_op->o_abandon = 1;
1145                                 soprev->s_next = so->s_next;
1146                                 break;
1147                 }
1148         }
1149         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1150         if ( so ) {
1151                 /* Is this really a Cancel exop? */
1152                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
1153                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
1154                         rs->sr_err = LDAP_CANCELLED;
1155                         send_ldap_result( so->s_op, rs );
1156                         if ( so->s_flags & PS_IS_DETACHED ) {
1157                                 slap_callback *cb;
1158                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
1159                                 cb->sc_cleanup = syncprov_ab_cleanup;
1160                                 cb->sc_next = op->o_callback;
1161                                 cb->sc_private = so;
1162                                 op->o_callback = cb;
1163                                 return SLAP_CB_CONTINUE;
1164                         }
1165                 }
1166                 syncprov_drop_psearch( so, 0 );
1167         }
1168         return SLAP_CB_CONTINUE;
1169 }
1170
1171 /* Find which persistent searches are affected by this operation */
1172 static void
1173 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
1174 {
1175         slap_overinst *on = opc->son;
1176         syncprov_info_t         *si = on->on_bi.bi_private;
1177
1178         fbase_cookie fc;
1179         syncops **pss;
1180         Entry *e = NULL;
1181         Attribute *a;
1182         int rc, gonext;
1183         struct berval newdn;
1184         int freefdn = 0;
1185         BackendDB *b0 = op->o_bd, db;
1186
1187         fc.fdn = &op->o_req_ndn;
1188         /* compute new DN */
1189         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1190                 struct berval pdn;
1191                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
1192                 else dnParent( fc.fdn, &pdn );
1193                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
1194                 fc.fdn = &newdn;
1195                 freefdn = 1;
1196         }
1197         if ( op->o_tag != LDAP_REQ_ADD ) {
1198                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1199                         db = *op->o_bd;
1200                         op->o_bd = &db;
1201                 }
1202                 rc = overlay_entry_get_ov( op, fc.fdn, NULL, NULL, 0, &e, on );
1203                 /* If we're sending responses now, make a copy and unlock the DB */
1204                 if ( e && !saveit ) {
1205                         if ( !opc->se )
1206                                 opc->se = entry_dup( e );
1207                         overlay_entry_release_ov( op, e, 0, on );
1208                         e = opc->se;
1209                 }
1210                 if ( rc ) {
1211                         op->o_bd = b0;
1212                         return;
1213                 }
1214         } else {
1215                 e = op->ora_e;
1216                 if ( !saveit ) {
1217                         if ( !opc->se )
1218                                 opc->se = entry_dup( e );
1219                         e = opc->se;
1220                 }
1221         }
1222
1223         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1224                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1225                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1226                 opc->sreference = is_entry_referral( e );
1227                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1228                 if ( a )
1229                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1230         } else if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1231                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1232                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1233                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1234                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1235         }
1236
1237         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1238         for (pss = &si->si_ops; *pss; pss = gonext ? &(*pss)->s_next : pss)
1239         {
1240                 Operation op2;
1241                 Opheader oh;
1242                 syncmatches *sm;
1243                 int found = 0;
1244                 syncops *snext, *ss = *pss;
1245
1246                 gonext = 1;
1247                 if ( ss->s_op->o_abandon )
1248                         continue;
1249
1250                 /* Don't send ops back to the originator */
1251                 if ( opc->osid > 0 && opc->osid == ss->s_sid ) {
1252                         Debug( LDAP_DEBUG_SYNC, "syncprov_matchops: skipping original sid %03x\n",
1253                                 opc->osid, 0, 0 );
1254                         continue;
1255                 }
1256
1257                 /* Don't send ops back to the messenger */
1258                 if ( opc->rsid > 0 && opc->rsid == ss->s_sid ) {
1259                         Debug( LDAP_DEBUG_SYNC, "syncprov_matchops: skipping relayed sid %03x\n",
1260                                 opc->rsid, 0, 0 );
1261                         continue;
1262                 }
1263
1264                 /* validate base */
1265                 fc.fss = ss;
1266                 fc.fbase = 0;
1267                 fc.fscope = 0;
1268
1269                 /* If the base of the search is missing, signal a refresh */
1270                 rc = syncprov_findbase( op, &fc );
1271                 if ( rc != LDAP_SUCCESS ) {
1272                         SlapReply rs = {REP_RESULT};
1273                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1274                                 "search base has changed" );
1275                         snext = ss->s_next;
1276                         if ( syncprov_drop_psearch( ss, 1 ) )
1277                                 *pss = snext;
1278                         gonext = 0;
1279                         continue;
1280                 }
1281
1282                 /* If we're sending results now, look for this op in old matches */
1283                 if ( !saveit ) {
1284                         syncmatches *old;
1285
1286                         /* Did we modify the search base? */
1287                         if ( dn_match( &op->o_req_ndn, &ss->s_base )) {
1288                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1289                                 ss->s_flags |= PS_WROTE_BASE;
1290                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1291                         }
1292
1293                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1294                                 old=sm, sm=sm->sm_next ) {
1295                                 if ( sm->sm_op == ss ) {
1296                                         found = 1;
1297                                         old->sm_next = sm->sm_next;
1298                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1299                                         break;
1300                                 }
1301                         }
1302                 }
1303
1304                 if ( fc.fscope ) {
1305                         ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1306                         op2 = *ss->s_op;
1307                         oh = *op->o_hdr;
1308                         oh.oh_conn = ss->s_op->o_conn;
1309                         oh.oh_connid = ss->s_op->o_connid;
1310                         op2.o_bd = op->o_bd->bd_self;
1311                         op2.o_hdr = &oh;
1312                         op2.o_extra = op->o_extra;
1313                         op2.o_callback = NULL;
1314                         if (ss->s_flags & PS_FIX_FILTER) {
1315                                 /* Skip the AND/GE clause that we stuck on in front. We
1316                                    would lose deletes/mods that happen during the refresh
1317                                    phase otherwise (ITS#6555) */
1318                                 op2.ors_filter = ss->s_op->ors_filter->f_and->f_next;
1319                         }
1320                         rc = test_filter( &op2, e, op2.ors_filter );
1321                         ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1322                 }
1323
1324                 Debug( LDAP_DEBUG_TRACE, "syncprov_matchops: sid %03x fscope %d rc %d\n",
1325                         ss->s_sid, fc.fscope, rc );
1326
1327                 /* check if current o_req_dn is in scope and matches filter */
1328                 if ( fc.fscope && rc == LDAP_COMPARE_TRUE ) {
1329                         if ( saveit ) {
1330                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1331                                 sm->sm_next = opc->smatches;
1332                                 sm->sm_op = ss;
1333                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1334                                 ++ss->s_inuse;
1335                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1336                                 opc->smatches = sm;
1337                         } else {
1338                                 /* if found send UPDATE else send ADD */
1339                                 syncprov_qresp( opc, ss,
1340                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD );
1341                         }
1342                 } else if ( !saveit && found ) {
1343                         /* send DELETE */
1344                         syncprov_qresp( opc, ss, LDAP_SYNC_DELETE );
1345                 } else if ( !saveit ) {
1346                         syncprov_qresp( opc, ss, LDAP_SYNC_NEW_COOKIE );
1347                 }
1348                 if ( !saveit && found ) {
1349                         /* Decrement s_inuse, was incremented when called
1350                          * with saveit == TRUE
1351                          */
1352                         snext = ss->s_next;
1353                         if ( syncprov_free_syncop( ss ) ) {
1354                                 *pss = snext;
1355                                 gonext = 0;
1356                         }
1357                 }
1358         }
1359         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1360
1361         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1362                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1363                         op->o_bd = &db;
1364                 }
1365                 if ( saveit )
1366                         overlay_entry_release_ov( op, e, 0, on );
1367                 op->o_bd = b0;
1368         }
1369         if ( !saveit ) {
1370                 if ( opc->ssres.s_info )
1371                         free_resinfo( &opc->ssres );
1372                 else if ( opc->se )
1373                         entry_free( opc->se );
1374         }
1375         if ( freefdn ) {
1376                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1377         }
1378         op->o_bd = b0;
1379 }
1380
1381 static int
1382 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1383 {
1384         slap_callback *cb = op->o_callback;
1385         opcookie *opc = cb->sc_private;
1386         slap_overinst *on = opc->son;
1387         syncprov_info_t         *si = on->on_bi.bi_private;
1388         syncmatches *sm, *snext;
1389         modtarget *mt;
1390
1391         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1392         if ( si->si_active )
1393                 si->si_active--;
1394         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1395
1396         for (sm = opc->smatches; sm; sm=snext) {
1397                 snext = sm->sm_next;
1398                 syncprov_free_syncop( sm->sm_op );
1399                 op->o_tmpfree( sm, op->o_tmpmemctx );
1400         }
1401
1402         /* Remove op from lock table */
1403         mt = opc->smt;
1404         if ( mt ) {
1405                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1406                 mt->mt_mods = mt->mt_mods->mi_next;
1407                 /* If there are more, promote the next one */
1408                 if ( mt->mt_mods ) {
1409                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1410                 } else {
1411                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1412                         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1413                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1414                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1415                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1416                         ch_free( mt->mt_dn.bv_val );
1417                         ch_free( mt );
1418                 }
1419         }
1420         if ( !BER_BVISNULL( &opc->suuid ))
1421                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1422         if ( !BER_BVISNULL( &opc->sndn ))
1423                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1424         if ( !BER_BVISNULL( &opc->sdn ))
1425                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1426         op->o_callback = cb->sc_next;
1427         op->o_tmpfree(cb, op->o_tmpmemctx);
1428
1429         return 0;
1430 }
1431
1432 static void
1433 syncprov_checkpoint( Operation *op, slap_overinst *on )
1434 {
1435         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
1436         Modifications mod;
1437         Operation opm;
1438         SlapReply rsm = {REP_RESULT};
1439         slap_callback cb = {0};
1440         BackendDB be;
1441         BackendInfo *bi;
1442
1443 #ifdef CHECK_CSN
1444         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1445
1446         int i;
1447         for ( i=0; i<si->si_numcsns; i++ ) {
1448                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1449         }
1450 #endif
1451         mod.sml_numvals = si->si_numcsns;
1452         mod.sml_values = si->si_ctxcsn;
1453         mod.sml_nvalues = NULL;
1454         mod.sml_desc = slap_schema.si_ad_contextCSN;
1455         mod.sml_op = LDAP_MOD_REPLACE;
1456         mod.sml_flags = SLAP_MOD_INTERNAL;
1457         mod.sml_next = NULL;
1458
1459         cb.sc_response = slap_null_cb;
1460         opm = *op;
1461         opm.o_tag = LDAP_REQ_MODIFY;
1462         opm.o_callback = &cb;
1463         opm.orm_modlist = &mod;
1464         opm.orm_no_opattrs = 1;
1465         if ( SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1466                 be = *on->on_info->oi_origdb;
1467                 opm.o_bd = &be;
1468         }
1469         opm.o_req_dn = si->si_contextdn;
1470         opm.o_req_ndn = si->si_contextdn;
1471         bi = opm.o_bd->bd_info;
1472         opm.o_bd->bd_info = on->on_info->oi_orig;
1473         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1474         opm.o_no_schema_check = 1;
1475         opm.o_bd->be_modify( &opm, &rsm );
1476
1477         if ( rsm.sr_err == LDAP_NO_SUCH_OBJECT &&
1478                 SLAP_SYNC_SUBENTRY( opm.o_bd )) {
1479                 const char      *text;
1480                 char txtbuf[SLAP_TEXT_BUFLEN];
1481                 size_t textlen = sizeof txtbuf;
1482                 Entry *e = slap_create_context_csn_entry( opm.o_bd, NULL );
1483                 rs_reinit( &rsm, REP_RESULT );
1484                 slap_mods2entry( &mod, &e, 0, 1, &text, txtbuf, textlen);
1485                 opm.ora_e = e;
1486                 opm.o_bd->be_add( &opm, &rsm );
1487                 if ( e == opm.ora_e )
1488                         be_entry_release_w( &opm, opm.ora_e );
1489         }
1490         opm.o_bd->bd_info = bi;
1491
1492         if ( mod.sml_next != NULL ) {
1493                 slap_mods_free( mod.sml_next, 1 );
1494         }
1495 #ifdef CHECK_CSN
1496         for ( i=0; i<si->si_numcsns; i++ ) {
1497                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1498         }
1499 #endif
1500 }
1501
1502 static void
1503 syncprov_add_slog( Operation *op )
1504 {
1505         opcookie *opc = op->o_callback->sc_private;
1506         slap_overinst *on = opc->son;
1507         syncprov_info_t         *si = on->on_bi.bi_private;
1508         sessionlog *sl;
1509         slog_entry *se;
1510
1511         sl = si->si_logs;
1512         {
1513                 if ( BER_BVISEMPTY( &op->o_csn ) ) {
1514                         /* During the syncrepl refresh phase we can receive operations
1515                          * without a csn.  We cannot reliably determine the consumers
1516                          * state with respect to such operations, so we ignore them and
1517                          * wipe out anything in the log if we see them.
1518                          */
1519                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1520                         while ( se = sl->sl_head ) {
1521                                 sl->sl_head = se->se_next;
1522                                 ch_free( se );
1523                         }
1524                         sl->sl_tail = NULL;
1525                         sl->sl_num = 0;
1526                         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1527                         return;
1528                 }
1529
1530                 /* Allocate a record. UUIDs are not NUL-terminated. */
1531                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1532                         op->o_csn.bv_len + 1 );
1533                 se->se_next = NULL;
1534                 se->se_tag = op->o_tag;
1535
1536                 se->se_uuid.bv_val = (char *)(&se[1]);
1537                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1538                 se->se_uuid.bv_len = opc->suuid.bv_len;
1539
1540                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1541                 AC_MEMCPY( se->se_csn.bv_val, op->o_csn.bv_val, op->o_csn.bv_len );
1542                 se->se_csn.bv_val[op->o_csn.bv_len] = '\0';
1543                 se->se_csn.bv_len = op->o_csn.bv_len;
1544                 se->se_sid = slap_parse_csn_sid( &se->se_csn );
1545
1546                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1547                 if ( sl->sl_head ) {
1548                         /* Keep the list in csn order. */
1549                         if ( ber_bvcmp( &sl->sl_tail->se_csn, &se->se_csn ) <= 0 ) {
1550                                 sl->sl_tail->se_next = se;
1551                                 sl->sl_tail = se;
1552                         } else {
1553                                 slog_entry **sep;
1554
1555                                 for ( sep = &sl->sl_head; *sep; sep = &(*sep)->se_next ) {
1556                                         if ( ber_bvcmp( &se->se_csn, &(*sep)->se_csn ) < 0 ) {
1557                                                 se->se_next = *sep;
1558                                                 *sep = se;
1559                                                 break;
1560                                         }
1561                                 }
1562                         }
1563                 } else {
1564                         sl->sl_head = se;
1565                         sl->sl_tail = se;
1566                         if ( !sl->sl_mincsn ) {
1567                                 sl->sl_numcsns = 1;
1568                                 sl->sl_mincsn = ch_malloc( 2*sizeof( struct berval ));
1569                                 sl->sl_sids = ch_malloc( sizeof( int ));
1570                                 sl->sl_sids[0] = se->se_sid;
1571                                 ber_dupbv( sl->sl_mincsn, &se->se_csn );
1572                                 BER_BVZERO( &sl->sl_mincsn[1] );
1573                         }
1574                 }
1575                 sl->sl_num++;
1576                 while ( sl->sl_num > sl->sl_size ) {
1577                         int i, j;
1578                         se = sl->sl_head;
1579                         sl->sl_head = se->se_next;
1580                         for ( i=0; i<sl->sl_numcsns; i++ )
1581                                 if ( sl->sl_sids[i] >= se->se_sid )
1582                                         break;
1583                         if  ( i == sl->sl_numcsns || sl->sl_sids[i] != se->se_sid ) {
1584                                 slap_insert_csn_sids( (struct sync_cookie *)sl,
1585                                         i, se->se_sid, &se->se_csn );
1586                         } else {
1587                                 ber_bvreplace( &sl->sl_mincsn[i], &se->se_csn );
1588                         }
1589                         ch_free( se );
1590                         sl->sl_num--;
1591                 }
1592                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1593         }
1594 }
1595
1596 /* Just set a flag if we found the matching entry */
1597 static int
1598 playlog_cb( Operation *op, SlapReply *rs )
1599 {
1600         if ( rs->sr_type == REP_SEARCH ) {
1601                 op->o_callback->sc_private = (void *)1;
1602         }
1603         return rs->sr_err;
1604 }
1605
1606 /* enter with sl->sl_mutex locked, release before returning */
1607 static void
1608 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1609         sync_control *srs, BerVarray ctxcsn, int numcsns, int *sids )
1610 {
1611         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1612         slog_entry *se;
1613         int i, j, ndel, num, nmods, mmods;
1614         char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
1615         BerVarray uuids;
1616         struct berval delcsn[2];
1617
1618         if ( !sl->sl_num ) {
1619                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1620                 return;
1621         }
1622
1623         num = sl->sl_num;
1624         i = 0;
1625         nmods = 0;
1626
1627         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1628                 num * UUID_LEN, op->o_tmpmemctx );
1629         uuids[0].bv_val = (char *)(uuids + num + 1);
1630
1631         delcsn[0].bv_len = 0;
1632         delcsn[0].bv_val = cbuf;
1633         BER_BVZERO(&delcsn[1]);
1634
1635         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1636          * and everything else at the end. Do this first so we can
1637          * unlock the list mutex.
1638          */
1639         Debug( LDAP_DEBUG_SYNC, "srs csn %s\n",
1640                 srs->sr_state.ctxcsn[0].bv_val, 0, 0 );
1641         for ( se=sl->sl_head; se; se=se->se_next ) {
1642                 int k;
1643                 Debug( LDAP_DEBUG_SYNC, "log csn %s\n", se->se_csn.bv_val, 0, 0 );
1644                 ndel = 1;
1645                 for ( k=0; k<srs->sr_state.numcsns; k++ ) {
1646                         if ( se->se_sid == srs->sr_state.sids[k] ) {
1647                                 ndel = ber_bvcmp( &se->se_csn, &srs->sr_state.ctxcsn[k] );
1648                                 break;
1649                         }
1650                 }
1651                 if ( ndel <= 0 ) {
1652                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too old\n", ndel, 0, 0 );
1653                         continue;
1654                 }
1655                 ndel = 0;
1656                 for ( k=0; k<numcsns; k++ ) {
1657                         if ( se->se_sid == sids[k] ) {
1658                                 ndel = ber_bvcmp( &se->se_csn, &ctxcsn[k] );
1659                                 break;
1660                         }
1661                 }
1662                 if ( ndel > 0 ) {
1663                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too new\n", ndel, 0, 0 );
1664                         break;
1665                 }
1666                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1667                         j = i;
1668                         i++;
1669                         AC_MEMCPY( cbuf, se->se_csn.bv_val, se->se_csn.bv_len );
1670                         delcsn[0].bv_len = se->se_csn.bv_len;
1671                         delcsn[0].bv_val[delcsn[0].bv_len] = '\0';
1672                 } else {
1673                         if ( se->se_tag == LDAP_REQ_ADD )
1674                                 continue;
1675                         nmods++;
1676                         j = num - nmods;
1677                 }
1678                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1679                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1680                 uuids[j].bv_len = UUID_LEN;
1681         }
1682         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1683
1684         ndel = i;
1685
1686         /* Zero out unused slots */
1687         for ( i=ndel; i < num - nmods; i++ )
1688                 uuids[i].bv_len = 0;
1689
1690         /* Mods must be validated to see if they belong in this delete set.
1691          */
1692
1693         mmods = nmods;
1694         /* Strip any duplicates */
1695         for ( i=0; i<nmods; i++ ) {
1696                 for ( j=0; j<ndel; j++ ) {
1697                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1698                                 uuids[num - 1 - i].bv_len = 0;
1699                                 mmods --;
1700                                 break;
1701                         }
1702                 }
1703                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1704                 for ( j=0; j<i; j++ ) {
1705                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1706                                 uuids[num - 1 - i].bv_len = 0;
1707                                 mmods --;
1708                                 break;
1709                         }
1710                 }
1711         }
1712
1713         if ( mmods ) {
1714                 Operation fop;
1715                 int rc;
1716                 Filter mf, af;
1717                 AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
1718                 slap_callback cb = {0};
1719
1720                 fop = *op;
1721
1722                 fop.o_sync_mode = 0;
1723                 fop.o_callback = &cb;
1724                 fop.ors_limit = NULL;
1725                 fop.ors_tlimit = SLAP_NO_LIMIT;
1726                 fop.ors_attrs = slap_anlist_all_attributes;
1727                 fop.ors_attrsonly = 0;
1728                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1729
1730                 af.f_choice = LDAP_FILTER_AND;
1731                 af.f_next = NULL;
1732                 af.f_and = &mf;
1733                 mf.f_choice = LDAP_FILTER_EQUALITY;
1734                 mf.f_ava = &eq;
1735                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1736                 mf.f_next = fop.ors_filter;
1737
1738                 fop.ors_filter = &af;
1739
1740                 cb.sc_response = playlog_cb;
1741                 fop.o_bd->bd_info = (BackendInfo *)on->on_info;
1742
1743                 for ( i=ndel; i<num; i++ ) {
1744                   if ( uuids[i].bv_len != 0 ) {
1745                         SlapReply frs = { REP_RESULT };
1746
1747                         mf.f_av_value = uuids[i];
1748                         cb.sc_private = NULL;
1749                         fop.ors_slimit = 1;
1750                         rc = fop.o_bd->be_search( &fop, &frs );
1751
1752                         /* If entry was not found, add to delete list */
1753                         if ( !cb.sc_private ) {
1754                                 uuids[ndel++] = uuids[i];
1755                         }
1756                   }
1757                 }
1758                 fop.o_bd->bd_info = (BackendInfo *)on;
1759         }
1760         if ( ndel ) {
1761                 struct berval cookie;
1762
1763                 if ( delcsn[0].bv_len ) {
1764                         slap_compose_sync_cookie( op, &cookie, delcsn, srs->sr_state.rid,
1765                                 slap_serverID ? slap_serverID : -1 );
1766
1767                         Debug( LDAP_DEBUG_SYNC, "syncprov_playlog: cookie=%s\n", cookie.bv_val, 0, 0 );
1768                 }
1769
1770                 uuids[ndel].bv_val = NULL;
1771                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET,
1772                         delcsn[0].bv_len ? &cookie : NULL, 0, uuids, 1 );
1773                 if ( delcsn[0].bv_len ) {
1774                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1775                 }
1776         }
1777         op->o_tmpfree( uuids, op->o_tmpmemctx );
1778 }
1779
1780 static int
1781 syncprov_op_response( Operation *op, SlapReply *rs )
1782 {
1783         opcookie *opc = op->o_callback->sc_private;
1784         slap_overinst *on = opc->son;
1785         syncprov_info_t         *si = on->on_bi.bi_private;
1786         syncmatches *sm;
1787
1788         if ( rs->sr_err == LDAP_SUCCESS )
1789         {
1790                 struct berval maxcsn;
1791                 char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
1792                 int do_check = 0, have_psearches, foundit, csn_changed = 0;
1793
1794                 ldap_pvt_thread_mutex_lock( &si->si_resp_mutex );
1795
1796                 /* Update our context CSN */
1797                 cbuf[0] = '\0';
1798                 maxcsn.bv_val = cbuf;
1799                 maxcsn.bv_len = sizeof(cbuf);
1800                 ldap_pvt_thread_rdwr_wlock( &si->si_csn_rwlock );
1801
1802                 slap_get_commit_csn( op, &maxcsn, &foundit );
1803                 if ( BER_BVISEMPTY( &maxcsn ) && SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1804                         /* syncrepl queues the CSN values in the db where
1805                          * it is configured , not where the changes are made.
1806                          * So look for a value in the glue db if we didn't
1807                          * find any in this db.
1808                          */
1809                         BackendDB *be = op->o_bd;
1810                         op->o_bd = select_backend( &be->be_nsuffix[0], 1);
1811                         maxcsn.bv_val = cbuf;
1812                         maxcsn.bv_len = sizeof(cbuf);
1813                         slap_get_commit_csn( op, &maxcsn, &foundit );
1814                         op->o_bd = be;
1815                 }
1816                 if ( !BER_BVISEMPTY( &maxcsn ) ) {
1817                         int i, sid;
1818 #ifdef CHECK_CSN
1819                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1820                         assert( !syn->ssyn_validate( syn, &maxcsn ));
1821 #endif
1822                         sid = slap_parse_csn_sid( &maxcsn );
1823                         for ( i=0; i<si->si_numcsns; i++ ) {
1824                                 if ( sid < si->si_sids[i] )
1825                                         break;
1826                                 if ( sid == si->si_sids[i] ) {
1827                                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn[i] ) > 0 ) {
1828                                                 ber_bvreplace( &si->si_ctxcsn[i], &maxcsn );
1829                                                 csn_changed = 1;
1830                                         }
1831                                         break;
1832                                 }
1833                         }
1834                         /* It's a new SID for us */
1835                         if ( i == si->si_numcsns || sid != si->si_sids[i] ) {
1836                                 slap_insert_csn_sids((struct sync_cookie *)&(si->si_ctxcsn),
1837                                         i, sid, &maxcsn );
1838                                 csn_changed = 1;
1839                         }
1840                 }
1841
1842                 /* Don't do any processing for consumer contextCSN updates */
1843                 if ( op->o_dont_replicate ) {
1844                         if ( op->o_tag == LDAP_REQ_MODIFY &&
1845                                 op->orm_modlist->sml_op == LDAP_MOD_REPLACE &&
1846                                 op->orm_modlist->sml_desc == slap_schema.si_ad_contextCSN ) {
1847                         /* Catch contextCSN updates from syncrepl. We have to look at
1848                          * all the attribute values, as there may be more than one csn
1849                          * that changed, and only one can be passed in the csn queue.
1850                          */
1851                         Modifications *mod = op->orm_modlist;
1852                         unsigned i;
1853                         int j, sid;
1854
1855                         for ( i=0; i<mod->sml_numvals; i++ ) {
1856                                 sid = slap_parse_csn_sid( &mod->sml_values[i] );
1857                                 for ( j=0; j<si->si_numcsns; j++ ) {
1858                                         if ( sid < si->si_sids[j] )
1859                                                 break;
1860                                         if ( sid == si->si_sids[j] ) {
1861                                                 if ( ber_bvcmp( &mod->sml_values[i], &si->si_ctxcsn[j] ) > 0 ) {
1862                                                         ber_bvreplace( &si->si_ctxcsn[j], &mod->sml_values[i] );
1863                                                         csn_changed = 1;
1864                                                 }
1865                                                 break;
1866                                         }
1867                                 }
1868
1869                                 if ( j == si->si_numcsns || sid != si->si_sids[j] ) {
1870                                         slap_insert_csn_sids( (struct sync_cookie *)&si->si_ctxcsn,
1871                                                 j, sid, &mod->sml_values[i] );
1872                                         csn_changed = 1;
1873                                 }
1874                         }
1875                         if ( csn_changed )
1876                                 si->si_dirty = 0;
1877                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1878
1879                         if ( csn_changed ) {
1880                                 syncops *ss;
1881                                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1882                                 for ( ss = si->si_ops; ss; ss = ss->s_next ) {
1883                                         if ( ss->s_op->o_abandon )
1884                                                 continue;
1885                                         /* Send the updated csn to all syncrepl consumers,
1886                                          * including the server from which it originated.
1887                                          * The syncrepl consumer and syncprov provider on
1888                                          * the originating server may be configured to store
1889                                          * their csn values in different entries.
1890                                          */
1891                                         syncprov_qresp( opc, ss, LDAP_SYNC_NEW_COOKIE );
1892                                 }
1893                                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1894                         }
1895                         } else {
1896                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1897                         }
1898                         goto leave;
1899                 }
1900
1901                 si->si_numops++;
1902                 if ( si->si_chkops || si->si_chktime ) {
1903                         /* Never checkpoint adding the context entry,
1904                          * it will deadlock
1905                          */
1906                         if ( op->o_tag != LDAP_REQ_ADD ||
1907                                 !dn_match( &op->o_req_ndn, &si->si_contextdn )) {
1908                                 if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1909                                         do_check = 1;
1910                                         si->si_numops = 0;
1911                                 }
1912                                 if ( si->si_chktime &&
1913                                         (op->o_time - si->si_chklast >= si->si_chktime )) {
1914                                         if ( si->si_chklast ) {
1915                                                 do_check = 1;
1916                                                 si->si_chklast = op->o_time;
1917                                         } else {
1918                                                 si->si_chklast = 1;
1919                                         }
1920                                 }
1921                         }
1922                 }
1923                 si->si_dirty = !csn_changed;
1924                 ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1925
1926                 if ( do_check ) {
1927                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1928                         syncprov_checkpoint( op, on );
1929                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1930                 }
1931
1932                 /* only update consumer ctx if this is a newer csn */
1933                 if ( csn_changed ) {
1934                         opc->sctxcsn = maxcsn;
1935                 }
1936
1937                 /* Handle any persistent searches */
1938                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1939                 have_psearches = ( si->si_ops != NULL );
1940                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1941                 if ( have_psearches ) {
1942                         switch(op->o_tag) {
1943                         case LDAP_REQ_ADD:
1944                         case LDAP_REQ_MODIFY:
1945                         case LDAP_REQ_MODRDN:
1946                         case LDAP_REQ_EXTENDED:
1947                                 syncprov_matchops( op, opc, 0 );
1948                                 break;
1949                         case LDAP_REQ_DELETE:
1950                                 /* for each match in opc->smatches:
1951                                  *   send DELETE msg
1952                                  */
1953                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1954                                         if ( sm->sm_op->s_op->o_abandon )
1955                                                 continue;
1956                                         syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_DELETE );
1957                                 }
1958                                 break;
1959                         }
1960                 }
1961
1962                 /* Add any log records */
1963                 if ( si->si_logs ) {
1964                         syncprov_add_slog( op );
1965                 }
1966 leave:          ldap_pvt_thread_mutex_unlock( &si->si_resp_mutex );
1967         }
1968         return SLAP_CB_CONTINUE;
1969 }
1970
1971 /* We don't use a subentry to store the context CSN any more.
1972  * We expose the current context CSN as an operational attribute
1973  * of the suffix entry.
1974  */
1975 static int
1976 syncprov_op_compare( Operation *op, SlapReply *rs )
1977 {
1978         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1979         syncprov_info_t         *si = on->on_bi.bi_private;
1980         int rc = SLAP_CB_CONTINUE;
1981
1982         if ( dn_match( &op->o_req_ndn, &si->si_contextdn ) &&
1983                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1984         {
1985                 Entry e = {0};
1986                 Attribute a = {0};
1987
1988                 e.e_name = si->si_contextdn;
1989                 e.e_nname = si->si_contextdn;
1990                 e.e_attrs = &a;
1991
1992                 a.a_desc = slap_schema.si_ad_contextCSN;
1993
1994                 ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1995
1996                 a.a_vals = si->si_ctxcsn;
1997                 a.a_nvals = a.a_vals;
1998                 a.a_numvals = si->si_numcsns;
1999
2000                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
2001                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
2002                 if ( ! rs->sr_err ) {
2003                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
2004                         goto return_results;
2005                 }
2006
2007                 if ( get_assert( op ) &&
2008                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
2009                 {
2010                         rs->sr_err = LDAP_ASSERTION_FAILED;
2011                         goto return_results;
2012                 }
2013
2014
2015                 rs->sr_err = LDAP_COMPARE_FALSE;
2016
2017                 if ( attr_valfind( &a,
2018                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
2019                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
2020                                 &op->oq_compare.rs_ava->aa_value, NULL, op->o_tmpmemctx ) == 0 )
2021                 {
2022                         rs->sr_err = LDAP_COMPARE_TRUE;
2023                 }
2024
2025 return_results:;
2026
2027                 ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2028
2029                 send_ldap_result( op, rs );
2030
2031                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
2032                         rs->sr_err = LDAP_SUCCESS;
2033                 }
2034                 rc = rs->sr_err;
2035         }
2036
2037         return rc;
2038 }
2039
2040 static int
2041 syncprov_op_mod( Operation *op, SlapReply *rs )
2042 {
2043         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2044         syncprov_info_t         *si = on->on_bi.bi_private;
2045         slap_callback *cb;
2046         opcookie *opc;
2047         int have_psearches, cbsize;
2048
2049         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2050         have_psearches = ( si->si_ops != NULL );
2051         si->si_active++;
2052         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2053
2054         cbsize = sizeof(slap_callback) + sizeof(opcookie) +
2055                 (have_psearches ? sizeof(modinst) : 0 );
2056
2057         cb = op->o_tmpcalloc(1, cbsize, op->o_tmpmemctx);
2058         opc = (opcookie *)(cb+1);
2059         opc->son = on;
2060         cb->sc_response = syncprov_op_response;
2061         cb->sc_cleanup = syncprov_op_cleanup;
2062         cb->sc_private = opc;
2063         cb->sc_next = op->o_callback;
2064         op->o_callback = cb;
2065
2066         opc->osid = -1;
2067         opc->rsid = -1;
2068         if ( op->o_csn.bv_val ) {
2069                 opc->osid = slap_parse_csn_sid( &op->o_csn );
2070         }
2071         if ( op->o_controls ) {
2072                 struct sync_cookie *scook =
2073                 op->o_controls[slap_cids.sc_LDAPsync];
2074                 if ( scook )
2075                         opc->rsid = scook->sid;
2076         }
2077
2078         if ( op->o_dont_replicate )
2079                 return SLAP_CB_CONTINUE;
2080
2081         /* If there are active persistent searches, lock this operation.
2082          * See seqmod.c for the locking logic on its own.
2083          */
2084         if ( have_psearches ) {
2085                 modtarget *mt, mtdummy;
2086                 modinst *mi;
2087
2088                 mi = (modinst *)(opc+1);
2089                 mi->mi_op = op;
2090
2091                 /* See if we're already modifying this entry... */
2092                 mtdummy.mt_dn = op->o_req_ndn;
2093                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
2094                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
2095                 if ( mt ) {
2096                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
2097                         if ( mt->mt_mods == NULL ) {
2098                                 /* Cannot reuse this mt, as another thread is about
2099                                  * to release it in syncprov_op_cleanup.
2100                                  */
2101                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2102                                 mt = NULL;
2103                         }
2104                 }
2105                 if ( mt ) {
2106                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
2107                         mt->mt_tail->mi_next = mi;
2108                         mt->mt_tail = mi;
2109                         /* wait for this op to get to head of list */
2110                         while ( mt->mt_mods != mi ) {
2111                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2112                                 /* FIXME: if dynamic config can delete overlays or
2113                                  * databases we'll have to check for cleanup here.
2114                                  * Currently it's not an issue because there are
2115                                  * no dynamic config deletes...
2116                                  */
2117                                 if ( slapd_shutdown )
2118                                         return SLAPD_ABANDON;
2119
2120                                 if ( !ldap_pvt_thread_pool_pausecheck( &connection_pool ))
2121                                         ldap_pvt_thread_yield();
2122                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
2123
2124                                 /* clean up if the caller is giving up */
2125                                 if ( op->o_abandon ) {
2126                                         modinst *m2;
2127                                         for ( m2 = mt->mt_mods; m2 && m2->mi_next != mi;
2128                                                 m2 = m2->mi_next );
2129                                         if ( m2 ) {
2130                                                 m2->mi_next = mi->mi_next;
2131                                                 if ( mt->mt_tail == mi ) mt->mt_tail = m2;
2132                                         }
2133                                         op->o_tmpfree( cb, op->o_tmpmemctx );
2134                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2135                                         return SLAPD_ABANDON;
2136                                 }
2137                         }
2138                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2139                 } else {
2140                         /* Record that we're modifying this entry now */
2141                         mt = ch_malloc( sizeof(modtarget) );
2142                         mt->mt_mods = mi;
2143                         mt->mt_tail = mi;
2144                         ber_dupbv( &mt->mt_dn, &mi->mi_op->o_req_ndn );
2145                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
2146                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
2147                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
2148                 }
2149                 opc->smt = mt;
2150         }
2151
2152         if (( have_psearches || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
2153                 syncprov_matchops( op, opc, 1 );
2154
2155         return SLAP_CB_CONTINUE;
2156 }
2157
2158 static int
2159 syncprov_op_extended( Operation *op, SlapReply *rs )
2160 {
2161         if ( exop_is_write( op ))
2162                 return syncprov_op_mod( op, rs );
2163
2164         return SLAP_CB_CONTINUE;
2165 }
2166
2167 typedef struct searchstate {
2168         slap_overinst *ss_on;
2169         syncops *ss_so;
2170         BerVarray ss_ctxcsn;
2171         int *ss_sids;
2172         int ss_numcsns;
2173 #define SS_PRESENT      0x01
2174 #define SS_CHANGED      0x02
2175         int ss_flags;
2176 } searchstate;
2177
2178 typedef struct SyncOperationBuffer {
2179         Operation               sob_op;
2180         Opheader                sob_hdr;
2181         OpExtra                 sob_oe;
2182         AttributeName   sob_extra;      /* not always present */
2183         /* Further data allocated here */
2184 } SyncOperationBuffer;
2185
2186 static void
2187 syncprov_detach_op( Operation *op, syncops *so, slap_overinst *on )
2188 {
2189         SyncOperationBuffer *sopbuf2;
2190         Operation *op2;
2191         int i, alen = 0;
2192         size_t size;
2193         char *ptr;
2194         GroupAssertion *g1, *g2;
2195
2196         /* count the search attrs */
2197         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2198                 alen += op->ors_attrs[i].an_name.bv_len + 1;
2199         }
2200         /* Make a new copy of the operation */
2201         size = offsetof( SyncOperationBuffer, sob_extra ) +
2202                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
2203                 op->o_req_dn.bv_len + 1 +
2204                 op->o_req_ndn.bv_len + 1 +
2205                 op->o_ndn.bv_len + 1 +
2206                 so->s_filterstr.bv_len + 1;
2207         sopbuf2 = ch_calloc( 1, size );
2208         op2 = &sopbuf2->sob_op;
2209         op2->o_hdr = &sopbuf2->sob_hdr;
2210         LDAP_SLIST_FIRST(&op2->o_extra) = &sopbuf2->sob_oe;
2211
2212         /* Copy the fields we care about explicitly, leave the rest alone */
2213         *op2->o_hdr = *op->o_hdr;
2214         op2->o_tag = op->o_tag;
2215         op2->o_time = op->o_time;
2216         op2->o_bd = on->on_info->oi_origdb;
2217         op2->o_request = op->o_request;
2218         op2->o_managedsait = op->o_managedsait;
2219         LDAP_SLIST_FIRST(&op2->o_extra)->oe_key = on;
2220         LDAP_SLIST_NEXT(LDAP_SLIST_FIRST(&op2->o_extra), oe_next) = NULL;
2221
2222         ptr = (char *) sopbuf2 + offsetof( SyncOperationBuffer, sob_extra );
2223         if ( i ) {
2224                 op2->ors_attrs = (AttributeName *) ptr;
2225                 ptr = (char *) &op2->ors_attrs[i+1];
2226                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2227                         op2->ors_attrs[i] = op->ors_attrs[i];
2228                         op2->ors_attrs[i].an_name.bv_val = ptr;
2229                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
2230                 }
2231                 BER_BVZERO( &op2->ors_attrs[i].an_name );
2232         }
2233
2234         op2->o_authz = op->o_authz;
2235         op2->o_ndn.bv_val = ptr;
2236         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
2237         op2->o_dn = op2->o_ndn;
2238         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
2239         op2->o_req_dn.bv_val = ptr;
2240         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
2241         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
2242         op2->o_req_ndn.bv_val = ptr;
2243         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
2244         op2->ors_filterstr.bv_val = ptr;
2245         strcpy( ptr, so->s_filterstr.bv_val );
2246         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
2247
2248         /* Skip the AND/GE clause that we stuck on in front */
2249         if ( so->s_flags & PS_FIX_FILTER ) {
2250                 op2->ors_filter = op->ors_filter->f_and->f_next;
2251                 so->s_flags ^= PS_FIX_FILTER;
2252         } else {
2253                 op2->ors_filter = op->ors_filter;
2254         }
2255         op2->ors_filter = filter_dup( op2->ors_filter, NULL );
2256         so->s_op = op2;
2257
2258         /* Copy any cached group ACLs individually */
2259         op2->o_groups = NULL;
2260         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
2261                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
2262                 *g2 = *g1;
2263                 strcpy( g2->ga_ndn, g1->ga_ndn );
2264                 g2->ga_next = op2->o_groups;
2265                 op2->o_groups = g2;
2266         }
2267         /* Don't allow any further group caching */
2268         op2->o_do_not_cache = 1;
2269
2270         /* Add op2 to conn so abandon will find us */
2271         op->o_conn->c_n_ops_executing++;
2272         op->o_conn->c_n_ops_completed--;
2273         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
2274         so->s_flags |= PS_IS_DETACHED;
2275
2276         /* Prevent anyone else from trying to send a result for this op */
2277         op->o_abandon = 1;
2278 }
2279
2280 static int
2281 syncprov_search_response( Operation *op, SlapReply *rs )
2282 {
2283         searchstate *ss = op->o_callback->sc_private;
2284         slap_overinst *on = ss->ss_on;
2285         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2286         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
2287
2288         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
2289                 Attribute *a;
2290                 /* If we got a referral without a referral object, there's
2291                  * something missing that we cannot replicate. Just ignore it.
2292                  * The consumer will abort because we didn't send the expected
2293                  * control.
2294                  */
2295                 if ( !rs->sr_entry ) {
2296                         assert( rs->sr_entry != NULL );
2297                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
2298                         return SLAP_CB_CONTINUE;
2299                 }
2300                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryCSN );
2301                 if ( a == NULL && rs->sr_operational_attrs != NULL ) {
2302                         a = attr_find( rs->sr_operational_attrs, slap_schema.si_ad_entryCSN );
2303                 }
2304                 if ( a ) {
2305                         int i, sid;
2306                         sid = slap_parse_csn_sid( &a->a_nvals[0] );
2307
2308                         /* Don't send changed entries back to the originator */
2309                         if ( sid == srs->sr_state.sid && srs->sr_state.numcsns ) {
2310                                 Debug( LDAP_DEBUG_SYNC,
2311                                         "Entry %s changed by peer, ignored\n",
2312                                         rs->sr_entry->e_name.bv_val, 0, 0 );
2313                                 return LDAP_SUCCESS;
2314                         }
2315
2316                         /* If not a persistent search */
2317                         if ( !ss->ss_so ) {
2318                                 /* Make sure entry is less than the snapshot'd contextCSN */
2319                                 for ( i=0; i<ss->ss_numcsns; i++ ) {
2320                                         if ( sid == ss->ss_sids[i] && ber_bvcmp( &a->a_nvals[0],
2321                                                 &ss->ss_ctxcsn[i] ) > 0 ) {
2322                                                 Debug( LDAP_DEBUG_SYNC,
2323                                                         "Entry %s CSN %s greater than snapshot %s\n",
2324                                                         rs->sr_entry->e_name.bv_val,
2325                                                         a->a_nvals[0].bv_val,
2326                                                         ss->ss_ctxcsn[i].bv_val );
2327                                                 return LDAP_SUCCESS;
2328                                         }
2329                                 }
2330                         }
2331
2332                         /* Don't send old entries twice */
2333                         if ( srs->sr_state.ctxcsn ) {
2334                                 for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2335                                         if ( sid == srs->sr_state.sids[i] &&
2336                                                 ber_bvcmp( &a->a_nvals[0],
2337                                                         &srs->sr_state.ctxcsn[i] )<= 0 ) {
2338                                                 Debug( LDAP_DEBUG_SYNC,
2339                                                         "Entry %s CSN %s older or equal to ctx %s\n",
2340                                                         rs->sr_entry->e_name.bv_val,
2341                                                         a->a_nvals[0].bv_val,
2342                                                         srs->sr_state.ctxcsn[i].bv_val );
2343                                                 return LDAP_SUCCESS;
2344                                         }
2345                                 }
2346                         }
2347                 }
2348                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2349                         op->o_tmpmemctx );
2350                 rs->sr_ctrls[1] = NULL;
2351                 rs->sr_flags |= REP_CTRLS_MUSTBEFREED;
2352                 /* If we're in delta-sync mode, always send a cookie */
2353                 if ( si->si_nopres && si->si_usehint && a ) {
2354                         struct berval cookie;
2355                         slap_compose_sync_cookie( op, &cookie, a->a_nvals, srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2356                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2357                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 1, &cookie );
2358                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2359                 } else {
2360                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2361                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
2362                 }
2363         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
2364                 struct berval cookie = BER_BVNULL;
2365
2366                 if ( ( ss->ss_flags & SS_CHANGED ) &&
2367                         ss->ss_ctxcsn && !BER_BVISNULL( &ss->ss_ctxcsn[0] )) {
2368                         slap_compose_sync_cookie( op, &cookie, ss->ss_ctxcsn,
2369                                 srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2370
2371                         Debug( LDAP_DEBUG_SYNC, "syncprov_search_response: cookie=%s\n", cookie.bv_val, 0, 0 );
2372                 }
2373
2374                 /* Is this a regular refresh?
2375                  * Note: refresh never gets here if there were no changes
2376                  */
2377                 if ( !ss->ss_so ) {
2378                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2379                                 op->o_tmpmemctx );
2380                         rs->sr_ctrls[1] = NULL;
2381                         rs->sr_flags |= REP_CTRLS_MUSTBEFREED;
2382                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
2383                                 0, 1, &cookie, ( ss->ss_flags & SS_PRESENT ) ?  LDAP_SYNC_REFRESH_PRESENTS :
2384                                         LDAP_SYNC_REFRESH_DELETES );
2385                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2386                 } else {
2387                 /* It's RefreshAndPersist, transition to Persist phase */
2388                         syncprov_sendinfo( op, rs, ( ss->ss_flags & SS_PRESENT ) ?
2389                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
2390                                 ( ss->ss_flags & SS_CHANGED ) ? &cookie : NULL,
2391                                 1, NULL, 0 );
2392                         if ( !BER_BVISNULL( &cookie ))
2393                                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2394
2395                         /* Detach this Op from frontend control */
2396                         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
2397
2398                         /* But not if this connection was closed along the way */
2399                         if ( op->o_abandon ) {
2400                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2401                                 /* syncprov_ab_cleanup will free this syncop */
2402                                 return SLAPD_ABANDON;
2403
2404                         } else {
2405                                 ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
2406                                 /* Turn off the refreshing flag */
2407                                 ss->ss_so->s_flags ^= PS_IS_REFRESHING;
2408
2409                                 syncprov_detach_op( op, ss->ss_so, on );
2410
2411                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2412
2413                                 /* If there are queued responses, fire them off */
2414                                 if ( ss->ss_so->s_res )
2415                                         syncprov_qstart( ss->ss_so );
2416                                 ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
2417                         }
2418
2419                         return LDAP_SUCCESS;
2420                 }
2421         }
2422
2423         return SLAP_CB_CONTINUE;
2424 }
2425
2426 static int
2427 syncprov_op_search( Operation *op, SlapReply *rs )
2428 {
2429         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2430         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2431         slap_callback   *cb;
2432         int gotstate = 0, changed = 0, do_present = 0;
2433         syncops *sop = NULL;
2434         searchstate *ss;
2435         sync_control *srs;
2436         BerVarray ctxcsn;
2437         int i, *sids, numcsns;
2438         struct berval mincsn, maxcsn;
2439         int minsid, maxsid;
2440         int dirty = 0;
2441
2442         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
2443
2444         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
2445                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
2446                 return rs->sr_err;
2447         }
2448
2449         srs = op->o_controls[slap_cids.sc_LDAPsync];
2450
2451         /* If this is a persistent search, set it up right away */
2452         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
2453                 syncops so = {0};
2454                 fbase_cookie fc;
2455                 opcookie opc;
2456                 slap_callback sc;
2457
2458                 fc.fss = &so;
2459                 fc.fbase = 0;
2460                 so.s_eid = NOID;
2461                 so.s_op = op;
2462                 so.s_flags = PS_IS_REFRESHING | PS_FIND_BASE;
2463                 /* syncprov_findbase expects to be called as a callback... */
2464                 sc.sc_private = &opc;
2465                 opc.son = on;
2466                 ldap_pvt_thread_mutex_init( &so.s_mutex );
2467                 cb = op->o_callback;
2468                 op->o_callback = &sc;
2469                 rs->sr_err = syncprov_findbase( op, &fc );
2470                 op->o_callback = cb;
2471                 ldap_pvt_thread_mutex_destroy( &so.s_mutex );
2472
2473                 if ( rs->sr_err != LDAP_SUCCESS ) {
2474                         send_ldap_result( op, rs );
2475                         return rs->sr_err;
2476                 }
2477                 sop = ch_malloc( sizeof( syncops ));
2478                 *sop = so;
2479                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
2480                 sop->s_rid = srs->sr_state.rid;
2481                 sop->s_sid = srs->sr_state.sid;
2482                 /* set refcount=2 to prevent being freed out from under us
2483                  * by abandons that occur while we're running here
2484                  */
2485                 sop->s_inuse = 2;
2486
2487                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2488                 while ( si->si_active ) {
2489                         /* Wait for active mods to finish before proceeding, as they
2490                          * may already have inspected the si_ops list looking for
2491                          * consumers to replicate the change to.  Using the log
2492                          * doesn't help, as we may finish playing it before the
2493                          * active mods gets added to it.
2494                          */
2495                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2496                         if ( slapd_shutdown ) {
2497                                 ch_free( sop );
2498                                 return SLAPD_ABANDON;
2499                         }
2500                         if ( !ldap_pvt_thread_pool_pausecheck( &connection_pool ))
2501                                 ldap_pvt_thread_yield();
2502                         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2503                 }
2504                 sop->s_next = si->si_ops;
2505                 si->si_ops = sop;
2506                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2507         }
2508
2509         /* snapshot the ctxcsn */
2510         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2511         numcsns = si->si_numcsns;
2512         if ( numcsns ) {
2513                 ber_bvarray_dup_x( &ctxcsn, si->si_ctxcsn, op->o_tmpmemctx );
2514                 sids = op->o_tmpalloc( numcsns * sizeof(int), op->o_tmpmemctx );
2515                 for ( i=0; i<numcsns; i++ )
2516                         sids[i] = si->si_sids[i];
2517         } else {
2518                 ctxcsn = NULL;
2519                 sids = NULL;
2520         }
2521         dirty = si->si_dirty;
2522         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2523
2524         /* If we have a cookie, handle the PRESENT lookups */
2525         if ( srs->sr_state.ctxcsn ) {
2526                 sessionlog *sl;
2527                 int i, j;
2528
2529                 /* If we don't have any CSN of our own yet, pretend nothing
2530                  * has changed.
2531                  */
2532                 if ( !numcsns )
2533                         goto no_change;
2534
2535                 if ( !si->si_nopres )
2536                         do_present = SS_PRESENT;
2537
2538                 /* If there are SIDs we don't recognize in the cookie, drop them */
2539                 for (i=0; i<srs->sr_state.numcsns; ) {
2540                         for (j=i; j<numcsns; j++) {
2541                                 if ( srs->sr_state.sids[i] <= sids[j] ) {
2542                                         break;
2543                                 }
2544                         }
2545                         /* not found */
2546                         if ( j == numcsns || srs->sr_state.sids[i] != sids[j] ) {
2547                                 char *tmp = srs->sr_state.ctxcsn[i].bv_val;
2548                                 srs->sr_state.numcsns--;
2549                                 for ( j=i; j<srs->sr_state.numcsns; j++ ) {
2550                                         srs->sr_state.ctxcsn[j] = srs->sr_state.ctxcsn[j+1];
2551                                         srs->sr_state.sids[j] = srs->sr_state.sids[j+1];
2552                                 }
2553                                 srs->sr_state.ctxcsn[j].bv_val = tmp;
2554                                 srs->sr_state.ctxcsn[j].bv_len = 0;
2555                                 continue;
2556                         }
2557                         i++;
2558                 }
2559
2560                 if (srs->sr_state.numcsns != numcsns) {
2561                         /* consumer doesn't have the right number of CSNs */
2562                         changed = SS_CHANGED;
2563                         if ( srs->sr_state.ctxcsn ) {
2564                                 ber_bvarray_free_x( srs->sr_state.ctxcsn, op->o_tmpmemctx );
2565                                 srs->sr_state.ctxcsn = NULL;
2566                         }
2567                         if ( srs->sr_state.sids ) {
2568                                 slap_sl_free( srs->sr_state.sids, op->o_tmpmemctx );
2569                                 srs->sr_state.sids = NULL;
2570                         }
2571                         srs->sr_state.numcsns = 0;
2572                         goto shortcut;
2573                 }
2574
2575                 /* Find the smallest CSN which differs from contextCSN */
2576                 mincsn.bv_len = 0;
2577                 maxcsn.bv_len = 0;
2578                 for ( i=0,j=0; i<srs->sr_state.numcsns; i++ ) {
2579                         int newer;
2580                         while ( srs->sr_state.sids[i] != sids[j] ) j++;
2581                         if ( BER_BVISEMPTY( &maxcsn ) || ber_bvcmp( &maxcsn,
2582                                 &srs->sr_state.ctxcsn[i] ) < 0 ) {
2583                                 maxcsn = srs->sr_state.ctxcsn[i];
2584                                 maxsid = sids[j];
2585                         }
2586                         newer = ber_bvcmp( &srs->sr_state.ctxcsn[i], &ctxcsn[j] );
2587                         /* If our state is newer, tell consumer about changes */
2588                         if ( newer < 0) {
2589                                 changed = SS_CHANGED;
2590                                 if ( BER_BVISEMPTY( &mincsn ) || ber_bvcmp( &mincsn,
2591                                         &srs->sr_state.ctxcsn[i] ) > 0 ) {
2592                                         mincsn = srs->sr_state.ctxcsn[i];
2593                                         minsid = sids[j];
2594                                 }
2595                         } else if ( newer > 0 && sids[j] == slap_serverID ) {
2596                         /* our state is older, complain to consumer */
2597                                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
2598                                 rs->sr_text = "consumer state is newer than provider!";
2599 bailout:
2600                                 if ( sop ) {
2601                                         syncops **sp = &si->si_ops;
2602
2603                                         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2604                                         while ( *sp != sop )
2605                                                 sp = &(*sp)->s_next;
2606                                         *sp = sop->s_next;
2607                                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2608                                         ch_free( sop );
2609                                 }
2610                                 rs->sr_ctrls = NULL;
2611                                 send_ldap_result( op, rs );
2612                                 return rs->sr_err;
2613                         }
2614                 }
2615                 if ( BER_BVISEMPTY( &mincsn )) {
2616                         mincsn = maxcsn;
2617                         minsid = maxsid;
2618                 }
2619
2620                 /* If nothing has changed, shortcut it */
2621                 if ( !changed && !dirty ) {
2622                         do_present = 0;
2623 no_change:              if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
2624                                 LDAPControl     *ctrls[2];
2625
2626                                 ctrls[0] = NULL;
2627                                 ctrls[1] = NULL;
2628                                 syncprov_done_ctrl( op, rs, ctrls, 0, 0,
2629                                         NULL, LDAP_SYNC_REFRESH_DELETES );
2630                                 rs->sr_ctrls = ctrls;
2631                                 rs->sr_err = LDAP_SUCCESS;
2632                                 send_ldap_result( op, rs );
2633                                 rs->sr_ctrls = NULL;
2634                                 return rs->sr_err;
2635                         }
2636                         goto shortcut;
2637                 }
2638
2639                 /* Do we have a sessionlog for this search? */
2640                 sl=si->si_logs;
2641                 if ( sl ) {
2642                         int do_play = 0;
2643                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
2644                         /* Are there any log entries, and is the consumer state
2645                          * present in the session log?
2646                          */
2647                         if ( sl->sl_num > 0 ) {
2648                                 int i;
2649                                 for ( i=0; i<sl->sl_numcsns; i++ ) {
2650                                         /* SID not present == new enough */
2651                                         if ( minsid < sl->sl_sids[i] ) {
2652                                                 do_play = 1;
2653                                                 break;
2654                                         }
2655                                         /* SID present */
2656                                         if ( minsid == sl->sl_sids[i] ) {
2657                                                 /* new enough? */
2658                                                 if ( ber_bvcmp( &mincsn, &sl->sl_mincsn[i] ) >= 0 )
2659                                                         do_play = 1;
2660                                                 break;
2661                                         }
2662                                 }
2663                                 /* SID not present == new enough */
2664                                 if ( i == sl->sl_numcsns )
2665                                         do_play = 1;
2666                         }
2667                         if ( do_play ) {
2668                                 do_present = 0;
2669                                 /* mutex is unlocked in playlog */
2670                                 syncprov_playlog( op, rs, sl, srs, ctxcsn, numcsns, sids );
2671                         } else {
2672                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
2673                         }
2674                 }
2675                 /* Is the CSN still present in the database? */
2676                 if ( syncprov_findcsn( op, FIND_CSN, &mincsn ) != LDAP_SUCCESS ) {
2677                         /* No, so a reload is required */
2678                         /* the 2.2 consumer doesn't send this hint */
2679                         if ( si->si_usehint && srs->sr_rhint == 0 ) {
2680                                 if ( ctxcsn )
2681                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2682                                 if ( sids )
2683                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2684                                 rs->sr_err = LDAP_SYNC_REFRESH_REQUIRED;
2685                                 rs->sr_text = "sync cookie is stale";
2686                                 goto bailout;
2687                         }
2688                         if ( srs->sr_state.ctxcsn ) {
2689                                 ber_bvarray_free_x( srs->sr_state.ctxcsn, op->o_tmpmemctx );
2690                                 srs->sr_state.ctxcsn = NULL;
2691                         }
2692                         if ( srs->sr_state.sids ) {
2693                                 slap_sl_free( srs->sr_state.sids, op->o_tmpmemctx );
2694                                 srs->sr_state.sids = NULL;
2695                         }
2696                         srs->sr_state.numcsns = 0;
2697                 } else {
2698                         gotstate = 1;
2699                         /* If changed and doing Present lookup, send Present UUIDs */
2700                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT, 0 ) !=
2701                                 LDAP_SUCCESS ) {
2702                                 if ( ctxcsn )
2703                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2704                                 if ( sids )
2705                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2706                                 goto bailout;
2707                         }
2708                 }
2709         } else {
2710                 /* No consumer state, assume something has changed */
2711                 changed = SS_CHANGED;
2712         }
2713
2714 shortcut:
2715         /* Append CSN range to search filter, save original filter
2716          * for persistent search evaluation
2717          */
2718         if ( sop ) {
2719                 ldap_pvt_thread_mutex_lock( &sop->s_mutex );
2720                 sop->s_filterstr = op->ors_filterstr;
2721                 /* correct the refcount that was set to 2 before */
2722                 sop->s_inuse--;
2723         }
2724
2725         /* If something changed, find the changes */
2726         if ( gotstate && ( changed || dirty ) ) {
2727                 Filter *fand, *fava;
2728
2729                 fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2730                 fand->f_choice = LDAP_FILTER_AND;
2731                 fand->f_next = NULL;
2732                 fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2733                 fand->f_and = fava;
2734                 fava->f_choice = LDAP_FILTER_GE;
2735                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
2736                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
2737 #ifdef LDAP_COMP_MATCH
2738                 fava->f_ava->aa_cf = NULL;
2739 #endif
2740                 ber_dupbv_x( &fava->f_ava->aa_value, &mincsn, op->o_tmpmemctx );
2741                 fava->f_next = op->ors_filter;
2742                 op->ors_filter = fand;
2743                 filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
2744                 if ( sop ) {
2745                         sop->s_flags |= PS_FIX_FILTER;
2746                 }
2747         }
2748         if ( sop ) {
2749                 ldap_pvt_thread_mutex_unlock( &sop->s_mutex );
2750         }
2751
2752         /* Let our callback add needed info to returned entries */
2753         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
2754         ss = (searchstate *)(cb+1);
2755         ss->ss_on = on;
2756         ss->ss_so = sop;
2757         ss->ss_flags = do_present | changed;
2758         ss->ss_ctxcsn = ctxcsn;
2759         ss->ss_numcsns = numcsns;
2760         ss->ss_sids = sids;
2761         cb->sc_response = syncprov_search_response;
2762         cb->sc_private = ss;
2763         cb->sc_next = op->o_callback;
2764         op->o_callback = cb;
2765
2766         /* If this is a persistent search and no changes were reported during
2767          * the refresh phase, just invoke the response callback to transition
2768          * us into persist phase
2769          */
2770         if ( !changed && !dirty ) {
2771                 rs->sr_err = LDAP_SUCCESS;
2772                 rs->sr_nentries = 0;
2773                 send_ldap_result( op, rs );
2774                 return rs->sr_err;
2775         }
2776         return SLAP_CB_CONTINUE;
2777 }
2778
2779 static int
2780 syncprov_operational(
2781         Operation *op,
2782         SlapReply *rs )
2783 {
2784         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2785         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2786
2787         /* This prevents generating unnecessarily; frontend will strip
2788          * any statically stored copy.
2789          */
2790         if ( op->o_sync != SLAP_CONTROL_NONE )
2791                 return SLAP_CB_CONTINUE;
2792
2793         if ( rs->sr_entry &&
2794                 dn_match( &rs->sr_entry->e_nname, &si->si_contextdn )) {
2795
2796                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
2797                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
2798                         Attribute *a, **ap = NULL;
2799
2800                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
2801                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
2802                                         break;
2803                         }
2804
2805                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2806                         if ( si->si_ctxcsn ) {
2807                                 if ( !a ) {
2808                                         for ( ap = &rs->sr_operational_attrs; *ap;
2809                                                 ap=&(*ap)->a_next );
2810
2811                                         a = attr_alloc( slap_schema.si_ad_contextCSN );
2812                                         *ap = a;
2813                                 }
2814
2815                                 if ( !ap ) {
2816                                         if ( rs_entry2modifiable( op, rs, on )) {
2817                                                 a = attr_find( rs->sr_entry->e_attrs,
2818                                                         slap_schema.si_ad_contextCSN );
2819                                         }
2820                                         if ( a->a_nvals != a->a_vals ) {
2821                                                 ber_bvarray_free( a->a_nvals );
2822                                         }
2823                                         a->a_nvals = NULL;
2824                                         ber_bvarray_free( a->a_vals );
2825                                         a->a_vals = NULL;
2826                                         a->a_numvals = 0;
2827                                 }
2828                                 attr_valadd( a, si->si_ctxcsn, si->si_ctxcsn, si->si_numcsns );
2829                         }
2830                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2831                 }
2832         }
2833         return SLAP_CB_CONTINUE;
2834 }
2835
2836 enum {
2837         SP_CHKPT = 1,
2838         SP_SESSL,
2839         SP_NOPRES,
2840         SP_USEHINT
2841 };
2842
2843 static ConfigDriver sp_cf_gen;
2844
2845 static ConfigTable spcfg[] = {
2846         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2847                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2848                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2849                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2850         { "syncprov-sessionlog", "ops", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2851                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2852                         "DESC 'Session log size in ops' "
2853                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2854         { "syncprov-nopresent", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_NOPRES,
2855                 sp_cf_gen, "( OLcfgOvAt:1.3 NAME 'olcSpNoPresent' "
2856                         "DESC 'Omit Present phase processing' "
2857                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2858         { "syncprov-reloadhint", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_USEHINT,
2859                 sp_cf_gen, "( OLcfgOvAt:1.4 NAME 'olcSpReloadHint' "
2860                         "DESC 'Observe Reload Hint in Request control' "
2861                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2862         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2863 };
2864
2865 static ConfigOCs spocs[] = {
2866         { "( OLcfgOvOc:1.1 "
2867                 "NAME 'olcSyncProvConfig' "
2868                 "DESC 'SyncRepl Provider configuration' "
2869                 "SUP olcOverlayConfig "
2870                 "MAY ( olcSpCheckpoint "
2871                         "$ olcSpSessionlog "
2872                         "$ olcSpNoPresent "
2873                         "$ olcSpReloadHint "
2874                 ") )",
2875                         Cft_Overlay, spcfg },
2876         { NULL, 0, NULL }
2877 };
2878
2879 static int
2880 sp_cf_gen(ConfigArgs *c)
2881 {
2882         slap_overinst           *on = (slap_overinst *)c->bi;
2883         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2884         int rc = 0;
2885
2886         if ( c->op == SLAP_CONFIG_EMIT ) {
2887                 switch ( c->type ) {
2888                 case SP_CHKPT:
2889                         if ( si->si_chkops || si->si_chktime ) {
2890                                 struct berval bv;
2891                                 /* we assume si_chktime is a multiple of 60
2892                                  * because the parsed value was originally
2893                                  * multiplied by 60 */
2894                                 bv.bv_len = snprintf( c->cr_msg, sizeof( c->cr_msg ),
2895                                         "%d %d", si->si_chkops, si->si_chktime/60 );
2896                                 if ( bv.bv_len >= sizeof( c->cr_msg ) ) {
2897                                         rc = 1;
2898                                 } else {
2899                                         bv.bv_val = c->cr_msg;
2900                                         value_add_one( &c->rvalue_vals, &bv );
2901                                 }
2902                         } else {
2903                                 rc = 1;
2904                         }
2905                         break;
2906                 case SP_SESSL:
2907                         if ( si->si_logs ) {
2908                                 c->value_int = si->si_logs->sl_size;
2909                         } else {
2910                                 rc = 1;
2911                         }
2912                         break;
2913                 case SP_NOPRES:
2914                         if ( si->si_nopres ) {
2915                                 c->value_int = 1;
2916                         } else {
2917                                 rc = 1;
2918                         }
2919                         break;
2920                 case SP_USEHINT:
2921                         if ( si->si_usehint ) {
2922                                 c->value_int = 1;
2923                         } else {
2924                                 rc = 1;
2925                         }
2926                         break;
2927                 }
2928                 return rc;
2929         } else if ( c->op == LDAP_MOD_DELETE ) {
2930                 switch ( c->type ) {
2931                 case SP_CHKPT:
2932                         si->si_chkops = 0;
2933                         si->si_chktime = 0;
2934                         break;
2935                 case SP_SESSL:
2936                         if ( si->si_logs )
2937                                 si->si_logs->sl_size = 0;
2938                         else
2939                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2940                         break;
2941                 case SP_NOPRES:
2942                         if ( si->si_nopres )
2943                                 si->si_nopres = 0;
2944                         else
2945                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2946                         break;
2947                 case SP_USEHINT:
2948                         if ( si->si_usehint )
2949                                 si->si_usehint = 0;
2950                         else
2951                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2952                         break;
2953                 }
2954                 return rc;
2955         }
2956         switch ( c->type ) {
2957         case SP_CHKPT:
2958                 if ( lutil_atoi( &si->si_chkops, c->argv[1] ) != 0 ) {
2959                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint ops # \"%s\"",
2960                                 c->argv[0], c->argv[1] );
2961                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2962                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2963                         return ARG_BAD_CONF;
2964                 }
2965                 if ( si->si_chkops <= 0 ) {
2966                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint ops # \"%d\"",
2967                                 c->argv[0], si->si_chkops );
2968                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2969                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2970                         return ARG_BAD_CONF;
2971                 }
2972                 if ( lutil_atoi( &si->si_chktime, c->argv[2] ) != 0 ) {
2973                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint time \"%s\"",
2974                                 c->argv[0], c->argv[1] );
2975                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2976                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2977                         return ARG_BAD_CONF;
2978                 }
2979                 if ( si->si_chktime <= 0 ) {
2980                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint time \"%d\"",
2981                                 c->argv[0], si->si_chkops );
2982                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2983                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2984                         return ARG_BAD_CONF;
2985                 }
2986                 si->si_chktime *= 60;
2987                 break;
2988         case SP_SESSL: {
2989                 sessionlog *sl;
2990                 int size = c->value_int;
2991
2992                 if ( size < 0 ) {
2993                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s size %d is negative",
2994                                 c->argv[0], size );
2995                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2996                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2997                         return ARG_BAD_CONF;
2998                 }
2999                 sl = si->si_logs;
3000                 if ( !sl ) {
3001                         sl = ch_malloc( sizeof( sessionlog ));
3002                         sl->sl_mincsn = NULL;
3003                         sl->sl_sids = NULL;
3004                         sl->sl_num = 0;
3005                         sl->sl_numcsns = 0;
3006                         sl->sl_head = sl->sl_tail = NULL;
3007                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
3008                         si->si_logs = sl;
3009                 }
3010                 sl->sl_size = size;
3011                 }
3012                 break;
3013         case SP_NOPRES:
3014                 si->si_nopres = c->value_int;
3015                 break;
3016         case SP_USEHINT:
3017                 si->si_usehint = c->value_int;
3018                 break;
3019         }
3020         return rc;
3021 }
3022
3023 /* ITS#3456 we cannot run this search on the main thread, must use a
3024  * child thread in order to insure we have a big enough stack.
3025  */
3026 static void *
3027 syncprov_db_otask(
3028         void *ptr
3029 )
3030 {
3031         syncprov_findcsn( ptr, FIND_MAXCSN, 0 );
3032         return NULL;
3033 }
3034
3035
3036 /* Read any existing contextCSN from the underlying db.
3037  * Then search for any entries newer than that. If no value exists,
3038  * just generate it. Cache whatever result.
3039  */
3040 static int
3041 syncprov_db_open(
3042         BackendDB *be,
3043         ConfigReply *cr
3044 )
3045 {
3046         slap_overinst   *on = (slap_overinst *) be->bd_info;
3047         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3048
3049         Connection conn = { 0 };
3050         OperationBuffer opbuf;
3051         Operation *op;
3052         Entry *e = NULL;
3053         Attribute *a;
3054         int rc;
3055         void *thrctx = NULL;
3056
3057         if ( !SLAP_LASTMOD( be )) {
3058                 Debug( LDAP_DEBUG_ANY,
3059                         "syncprov_db_open: invalid config, lastmod must be enabled\n", 0, 0, 0 );
3060                 return -1;
3061         }
3062
3063         if ( slapMode & SLAP_TOOL_MODE ) {
3064                 return 0;
3065         }
3066
3067         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
3068         if ( rc ) {
3069                 return rc;
3070         }
3071
3072         thrctx = ldap_pvt_thread_pool_context();
3073         connection_fake_init2( &conn, &opbuf, thrctx, 0 );
3074         op = &opbuf.ob_op;
3075         op->o_bd = be;
3076         op->o_dn = be->be_rootdn;
3077         op->o_ndn = be->be_rootndn;
3078
3079         if ( SLAP_SYNC_SUBENTRY( be )) {
3080                 build_new_dn( &si->si_contextdn, be->be_nsuffix,
3081                         (struct berval *)&slap_ldapsync_cn_bv, NULL );
3082         } else {
3083                 si->si_contextdn = be->be_nsuffix[0];
3084         }
3085         rc = overlay_entry_get_ov( op, &si->si_contextdn, NULL,
3086                 slap_schema.si_ad_contextCSN, 0, &e, on );
3087
3088         if ( e ) {
3089                 ldap_pvt_thread_t tid;
3090
3091                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
3092                 if ( a ) {
3093                         ber_bvarray_dup_x( &si->si_ctxcsn, a->a_vals, NULL );
3094                         si->si_numcsns = a->a_numvals;
3095                         si->si_sids = slap_parse_csn_sids( si->si_ctxcsn, a->a_numvals, NULL );
3096                         slap_sort_csn_sids( si->si_ctxcsn, si->si_sids, si->si_numcsns, NULL );
3097                 }
3098                 overlay_entry_release_ov( op, e, 0, on );
3099                 if ( si->si_ctxcsn && !SLAP_DBCLEAN( be )) {
3100                         op->o_tag = LDAP_REQ_SEARCH;
3101                         op->o_req_dn = be->be_suffix[0];
3102                         op->o_req_ndn = be->be_nsuffix[0];
3103                         op->ors_scope = LDAP_SCOPE_SUBTREE;
3104                         ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
3105                         ldap_pvt_thread_join( tid, NULL );
3106                 }
3107         }
3108
3109         /* Didn't find a contextCSN, should we generate one? */
3110         if ( !si->si_ctxcsn ) {
3111                 char csnbuf[ LDAP_PVT_CSNSTR_BUFSIZE ];
3112                 struct berval csn;
3113
3114                 if ( SLAP_SYNC_SHADOW( op->o_bd )) {
3115                 /* If we're also a consumer, then don't generate anything.
3116                  * Wait for our provider to send it to us, or for a local
3117                  * modify if we have multimaster.
3118                  */
3119                         goto out;
3120                 }
3121                 csn.bv_val = csnbuf;
3122                 csn.bv_len = sizeof( csnbuf );
3123                 slap_get_csn( op, &csn, 0 );
3124                 value_add_one( &si->si_ctxcsn, &csn );
3125                 si->si_numcsns = 1;
3126                 si->si_sids = ch_malloc( sizeof(int) );
3127                 si->si_sids[0] = slap_serverID;
3128
3129                 /* make sure we do a checkpoint on close */
3130                 si->si_numops++;
3131         }
3132
3133         /* Initialize the sessionlog mincsn */
3134         if ( si->si_logs && si->si_numcsns ) {
3135                 sessionlog *sl = si->si_logs;
3136                 int i;
3137                 ber_bvarray_dup_x( &sl->sl_mincsn, si->si_ctxcsn, NULL );
3138                 sl->sl_numcsns = si->si_numcsns;
3139                 sl->sl_sids = ch_malloc( si->si_numcsns * sizeof(int) );
3140                 for ( i=0; i < si->si_numcsns; i++ )
3141                         sl->sl_sids[i] = si->si_sids[i];
3142         }
3143
3144 out:
3145         op->o_bd->bd_info = (BackendInfo *)on;
3146         return 0;
3147 }
3148
3149 /* Write the current contextCSN into the underlying db.
3150  */
3151 static int
3152 syncprov_db_close(
3153         BackendDB *be,
3154         ConfigReply *cr
3155 )
3156 {
3157     slap_overinst   *on = (slap_overinst *) be->bd_info;
3158     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3159 #ifdef SLAP_CONFIG_DELETE
3160         syncops *so, *sonext;
3161 #endif /* SLAP_CONFIG_DELETE */
3162
3163         if ( slapMode & SLAP_TOOL_MODE ) {
3164                 return 0;
3165         }
3166         if ( si->si_numops ) {
3167                 Connection conn = {0};
3168                 OperationBuffer opbuf;
3169                 Operation *op;
3170                 void *thrctx;
3171
3172                 thrctx = ldap_pvt_thread_pool_context();
3173                 connection_fake_init2( &conn, &opbuf, thrctx, 0 );
3174                 op = &opbuf.ob_op;
3175                 op->o_bd = be;
3176                 op->o_dn = be->be_rootdn;
3177                 op->o_ndn = be->be_rootndn;
3178                 syncprov_checkpoint( op, on );
3179         }
3180
3181 #ifdef SLAP_CONFIG_DELETE
3182         if ( !slapd_shutdown ) {
3183                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
3184                 for ( so=si->si_ops, sonext=so;  so; so=sonext  ) {
3185                         SlapReply rs = {REP_RESULT};
3186                         rs.sr_err = LDAP_UNAVAILABLE;
3187                         send_ldap_result( so->s_op, &rs );
3188                         sonext=so->s_next;
3189                         syncprov_drop_psearch( so, 0);
3190                 }
3191                 si->si_ops=NULL;
3192                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
3193         }
3194         overlay_unregister_control( be, LDAP_CONTROL_SYNC );
3195 #endif /* SLAP_CONFIG_DELETE */
3196
3197     return 0;
3198 }
3199
3200 static int
3201 syncprov_db_init(
3202         BackendDB *be,
3203         ConfigReply *cr
3204 )
3205 {
3206         slap_overinst   *on = (slap_overinst *)be->bd_info;
3207         syncprov_info_t *si;
3208
3209         if ( SLAP_ISGLOBALOVERLAY( be ) ) {
3210                 Debug( LDAP_DEBUG_ANY,
3211                         "syncprov must be instantiated within a database.\n",
3212                         0, 0, 0 );
3213                 return 1;
3214         }
3215
3216         si = ch_calloc(1, sizeof(syncprov_info_t));
3217         on->on_bi.bi_private = si;
3218         ldap_pvt_thread_rdwr_init( &si->si_csn_rwlock );
3219         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
3220         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
3221         ldap_pvt_thread_mutex_init( &si->si_resp_mutex );
3222
3223         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
3224         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
3225         csn_anlist[1].an_desc = slap_schema.si_ad_entryUUID;
3226         csn_anlist[1].an_name = slap_schema.si_ad_entryUUID->ad_cname;
3227
3228         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
3229         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
3230
3231         return 0;
3232 }
3233
3234 static int
3235 syncprov_db_destroy(
3236         BackendDB *be,
3237         ConfigReply *cr
3238 )
3239 {
3240         slap_overinst   *on = (slap_overinst *)be->bd_info;
3241         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3242
3243         if ( si ) {
3244                 if ( si->si_logs ) {
3245                         sessionlog *sl = si->si_logs;
3246                         slog_entry *se = sl->sl_head;
3247
3248                         while ( se ) {
3249                                 slog_entry *se_next = se->se_next;
3250                                 ch_free( se );
3251                                 se = se_next;
3252                         }
3253                         if ( sl->sl_mincsn )
3254                                 ber_bvarray_free( sl->sl_mincsn );
3255                         if ( sl->sl_sids )
3256                                 ch_free( sl->sl_sids );
3257
3258                         ldap_pvt_thread_mutex_destroy(&si->si_logs->sl_mutex);
3259                         ch_free( si->si_logs );
3260                 }
3261                 if ( si->si_ctxcsn )
3262                         ber_bvarray_free( si->si_ctxcsn );
3263                 if ( si->si_sids )
3264                         ch_free( si->si_sids );
3265                 ldap_pvt_thread_mutex_destroy( &si->si_resp_mutex );
3266                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
3267                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
3268                 ldap_pvt_thread_rdwr_destroy( &si->si_csn_rwlock );
3269                 ch_free( si );
3270         }
3271
3272         return 0;
3273 }
3274
3275 static int syncprov_parseCtrl (
3276         Operation *op,
3277         SlapReply *rs,
3278         LDAPControl *ctrl )
3279 {
3280         ber_tag_t tag;
3281         BerElementBuffer berbuf;
3282         BerElement *ber = (BerElement *)&berbuf;
3283         ber_int_t mode;
3284         ber_len_t len;
3285         struct berval cookie = BER_BVNULL;
3286         sync_control *sr;
3287         int rhint = 0;
3288
3289         if ( op->o_sync != SLAP_CONTROL_NONE ) {
3290                 rs->sr_text = "Sync control specified multiple times";
3291                 return LDAP_PROTOCOL_ERROR;
3292         }
3293
3294         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
3295                 rs->sr_text = "Sync control specified with pagedResults control";
3296                 return LDAP_PROTOCOL_ERROR;
3297         }
3298
3299         if ( BER_BVISNULL( &ctrl->ldctl_value ) ) {
3300                 rs->sr_text = "Sync control value is absent";
3301                 return LDAP_PROTOCOL_ERROR;
3302         }
3303
3304         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
3305                 rs->sr_text = "Sync control value is empty";
3306                 return LDAP_PROTOCOL_ERROR;
3307         }
3308
3309         /* Parse the control value
3310          *      syncRequestValue ::= SEQUENCE {
3311          *              mode   ENUMERATED {
3312          *                      -- 0 unused
3313          *                      refreshOnly             (1),
3314          *                      -- 2 reserved
3315          *                      refreshAndPersist       (3)
3316          *              },
3317          *              cookie  syncCookie OPTIONAL
3318          *      }
3319          */
3320
3321         ber_init2( ber, &ctrl->ldctl_value, 0 );
3322
3323         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
3324                 rs->sr_text = "Sync control : mode decoding error";
3325                 return LDAP_PROTOCOL_ERROR;
3326         }
3327
3328         switch( mode ) {
3329         case LDAP_SYNC_REFRESH_ONLY:
3330                 mode = SLAP_SYNC_REFRESH;
3331                 break;
3332         case LDAP_SYNC_REFRESH_AND_PERSIST:
3333                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
3334                 break;
3335         default:
3336                 rs->sr_text = "Sync control : unknown update mode";
3337                 return LDAP_PROTOCOL_ERROR;
3338         }
3339
3340         tag = ber_peek_tag( ber, &len );
3341
3342         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
3343                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
3344                         rs->sr_text = "Sync control : cookie decoding error";
3345                         return LDAP_PROTOCOL_ERROR;
3346                 }
3347                 tag = ber_peek_tag( ber, &len );
3348         }
3349         if ( tag == LDAP_TAG_RELOAD_HINT ) {
3350                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
3351                         rs->sr_text = "Sync control : rhint decoding error";
3352                         return LDAP_PROTOCOL_ERROR;
3353                 }
3354         }
3355         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
3356                         rs->sr_text = "Sync control : decoding error";
3357                         return LDAP_PROTOCOL_ERROR;
3358         }
3359         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
3360         sr->sr_rhint = rhint;
3361         if (!BER_BVISNULL(&cookie)) {
3362                 ber_dupbv_x( &sr->sr_state.octet_str, &cookie, op->o_tmpmemctx );
3363                 /* If parse fails, pretend no cookie was sent */
3364                 if ( slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx ) ||
3365                         sr->sr_state.rid == -1 ) {
3366                         if ( sr->sr_state.ctxcsn ) {
3367                                 ber_bvarray_free_x( sr->sr_state.ctxcsn, op->o_tmpmemctx );
3368                                 sr->sr_state.ctxcsn = NULL;
3369                         }
3370                         sr->sr_state.numcsns = 0;
3371                 }
3372         }
3373
3374         op->o_controls[slap_cids.sc_LDAPsync] = sr;
3375
3376         op->o_sync = ctrl->ldctl_iscritical
3377                 ? SLAP_CONTROL_CRITICAL
3378                 : SLAP_CONTROL_NONCRITICAL;
3379
3380         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
3381
3382         return LDAP_SUCCESS;
3383 }
3384
3385 /* This overlay is set up for dynamic loading via moduleload. For static
3386  * configuration, you'll need to arrange for the slap_overinst to be
3387  * initialized and registered by some other function inside slapd.
3388  */
3389
3390 static slap_overinst            syncprov;
3391
3392 int
3393 syncprov_initialize()
3394 {
3395         int rc;
3396
3397         rc = register_supported_control( LDAP_CONTROL_SYNC,
3398                 SLAP_CTRL_SEARCH, NULL,
3399                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
3400         if ( rc != LDAP_SUCCESS ) {
3401                 Debug( LDAP_DEBUG_ANY,
3402                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
3403                 return rc;
3404         }
3405
3406         syncprov.on_bi.bi_type = "syncprov";
3407         syncprov.on_bi.bi_db_init = syncprov_db_init;
3408         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
3409         syncprov.on_bi.bi_db_open = syncprov_db_open;
3410         syncprov.on_bi.bi_db_close = syncprov_db_close;
3411
3412         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
3413         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
3414
3415         syncprov.on_bi.bi_op_add = syncprov_op_mod;
3416         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
3417         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
3418         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
3419         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
3420         syncprov.on_bi.bi_op_search = syncprov_op_search;
3421         syncprov.on_bi.bi_extended = syncprov_op_extended;
3422         syncprov.on_bi.bi_operational = syncprov_operational;
3423
3424         syncprov.on_bi.bi_cf_ocs = spocs;
3425
3426         generic_filter.f_desc = slap_schema.si_ad_objectClass;
3427
3428         rc = config_register_schema( spcfg, spocs );
3429         if ( rc ) return rc;
3430
3431         return overlay_register( &syncprov );
3432 }
3433
3434 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
3435 int
3436 init_module( int argc, char *argv[] )
3437 {
3438         return syncprov_initialize();
3439 }
3440 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
3441
3442 #endif /* defined(SLAPD_OVER_SYNCPROV) */