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

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