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