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 2004-2007 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 /* A modify request on a particular entry */
  32 typedef struct modinst {
  33         struct modinst *mi_next;
  34         Operation *mi_op;
  35 } modinst;
  36
  37 typedef struct modtarget {
  38         struct modinst *mt_mods;
  39         struct modinst *mt_tail;
  40         Operation *mt_op;
  41         ldap_pvt_thread_mutex_t mt_mutex;
  42 } modtarget;
  43
  44 /* A queued result of a persistent search */
  45 typedef struct syncres {
  46         struct syncres *s_next;
  47         struct berval s_dn;
  48         struct berval s_ndn;
  49         struct berval s_uuid;
  50         struct berval s_csn;
  51         char s_mode;
  52         char s_isreference;
  53 } syncres;
  54
  55 /* Record of a persistent search */
  56 typedef struct syncops {
  57         struct syncops *s_next;
  58         struct berval   s_base;         /* ndn of search base */
  59         ID              s_eid;          /* entryID of search base */
  60         Operation       *s_op;          /* search op */
  61         int             s_rid;
  62         int             s_sid;
  63         struct berval s_filterstr;
  64         int             s_flags;        /* search status */
  65 #define PS_IS_REFRESHING        0x01
  66 #define PS_IS_DETACHED          0x02
  67 #define PS_WROTE_BASE           0x04
  68 #define PS_FIND_BASE            0x08
  69 #define PS_FIX_FILTER           0x10
  70
  71         int             s_inuse;        /* reference count */
  72         struct syncres *s_res;
  73         struct syncres *s_restail;
  74         struct re_s     *s_qtask;       /* task for playing psearch responses */
  75 #define RUNQ_INTERVAL   36000   /* a long time */
  76         ldap_pvt_thread_mutex_t s_mutex;
  77 } syncops;
  78
  79 /* A received sync control */
  80 typedef struct sync_control {
  81         struct sync_cookie sr_state;
  82         int sr_rhint;
  83 } sync_control;
  84
  85 #if 0 /* moved back to slap.h */
  86 #define o_sync  o_ctrlflag[slap_cids.sc_LDAPsync]
  87 #endif
  88 /* o_sync_mode uses data bits of o_sync */
  89 #define o_sync_mode     o_ctrlflag[slap_cids.sc_LDAPsync]
  90
  91 #define SLAP_SYNC_NONE                                  (LDAP_SYNC_NONE<<SLAP_CONTROL_SHIFT)
  92 #define SLAP_SYNC_REFRESH                               (LDAP_SYNC_REFRESH_ONLY<<SLAP_CONTROL_SHIFT)
  93 #define SLAP_SYNC_PERSIST                               (LDAP_SYNC_RESERVED<<SLAP_CONTROL_SHIFT)
  94 #define SLAP_SYNC_REFRESH_AND_PERSIST   (LDAP_SYNC_REFRESH_AND_PERSIST<<SLAP_CONTROL_SHIFT)
  95
  96 /* Record of which searches matched at premodify step */
  97 typedef struct syncmatches {
  98         struct syncmatches *sm_next;
  99         syncops *sm_op;
 100 } syncmatches;
 101
 102 /* Session log data */
 103 typedef struct slog_entry {
 104         struct slog_entry *se_next;
 105         struct berval se_uuid;
 106         struct berval se_csn;
 107         int     se_sid;
 108         ber_tag_t       se_tag;
 109 } slog_entry;
 110
 111 typedef struct sessionlog {
 112         struct berval   sl_mincsn;
 113         int             sl_num;
 114         int             sl_size;
 115         slog_entry *sl_head;
 116         slog_entry *sl_tail;
 117         ldap_pvt_thread_mutex_t sl_mutex;
 118 } sessionlog;
 119
 120 /* The main state for this overlay */
 121 typedef struct syncprov_info_t {
 122         syncops         *si_ops;
 123         BerVarray       si_ctxcsn;      /* ldapsync context */
 124         int             *si_sids;
 125         int             si_numcsns;
 126         int             si_chkops;      /* checkpointing info */
 127         int             si_chktime;
 128         int             si_numops;      /* number of ops since last checkpoint */
 129         int             si_nopres;      /* Skip present phase */
 130         int             si_usehint;     /* use reload hint */
 131         time_t  si_chklast;     /* time of last checkpoint */
 132         Avlnode *si_mods;       /* entries being modified */
 133         sessionlog      *si_logs;
 134         ldap_pvt_thread_rdwr_t  si_csn_rwlock;
 135         ldap_pvt_thread_mutex_t si_ops_mutex;
 136         ldap_pvt_thread_mutex_t si_mods_mutex;
 137 } syncprov_info_t;
 138
 139 typedef struct opcookie {
 140         slap_overinst *son;
 141         syncmatches *smatches;
 142         struct berval sdn;      /* DN of entry, for deletes */
 143         struct berval sndn;
 144         struct berval suuid;    /* UUID of entry */
 145         struct berval sctxcsn;
 146         int sreference; /* Is the entry a reference? */
 147 } opcookie;
 148
 149 typedef struct fbase_cookie {
 150         struct berval *fdn;     /* DN of a modified entry, for scope testing */
 151         syncops *fss;   /* persistent search we're testing against */
 152         int fbase;      /* if TRUE we found the search base and it's still valid */
 153         int fscope;     /* if TRUE then fdn is within the psearch scope */
 154 } fbase_cookie;
 155
 156 static AttributeName csn_anlist[3];
 157 static AttributeName uuid_anlist[2];
 158
 159 /* Build a LDAPsync intermediate state control */
 160 static int
 161 syncprov_state_ctrl(
 162         Operation       *op,
 163         SlapReply       *rs,
 164         Entry           *e,
 165         int             entry_sync_state,
 166         LDAPControl     **ctrls,
 167         int             num_ctrls,
 168         int             send_cookie,
 169         struct berval   *cookie )
 170 {
 171         Attribute* a;
 172         int ret;
 173
 174         BerElementBuffer berbuf;
 175         BerElement *ber = (BerElement *)&berbuf;
 176
 177         struct berval   entryuuid_bv = BER_BVNULL;
 178
 179         ber_init2( ber, 0, LBER_USE_DER );
 180         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 181
 182         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 183
 184         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 185                 AttributeDescription *desc = a->a_desc;
 186                 if ( desc == slap_schema.si_ad_entryUUID ) {
 187                         entryuuid_bv = a->a_nvals[0];
 188                         break;
 189                 }
 190         }
 191
 192         /* FIXME: what if entryuuid is NULL or empty ? */
 193
 194         if ( send_cookie && cookie ) {
 195                 ber_printf( ber, "{eOON}",
 196                         entry_sync_state, &entryuuid_bv, cookie );
 197         } else {
 198                 ber_printf( ber, "{eON}",
 199                         entry_sync_state, &entryuuid_bv );
 200         }
 201
 202         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 203         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 204         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 205
 206         ber_free_buf( ber );
 207
 208         if ( ret < 0 ) {
 209                 Debug( LDAP_DEBUG_TRACE,
 210                         "slap_build_sync_ctrl: ber_flatten2 failed\n",
 211                         0, 0, 0 );
 212                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 213                 return ret;
 214         }
 215
 216         return LDAP_SUCCESS;
 217 }
 218
 219 /* Build a LDAPsync final state control */
 220 static int
 221 syncprov_done_ctrl(
 222         Operation       *op,
 223         SlapReply       *rs,
 224         LDAPControl     **ctrls,
 225         int                     num_ctrls,
 226         int                     send_cookie,
 227         struct berval *cookie,
 228         int                     refreshDeletes )
 229 {
 230         int ret;
 231         BerElementBuffer berbuf;
 232         BerElement *ber = (BerElement *)&berbuf;
 233
 234         ber_init2( ber, NULL, LBER_USE_DER );
 235         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 236
 237         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 238
 239         ber_printf( ber, "{" );
 240         if ( send_cookie && cookie ) {
 241                 ber_printf( ber, "O", cookie );
 242         }
 243         if ( refreshDeletes == LDAP_SYNC_REFRESH_DELETES ) {
 244                 ber_printf( ber, "b", refreshDeletes );
 245         }
 246         ber_printf( ber, "N}" );
 247
 248         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_DONE;
 249         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 250         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 251
 252         ber_free_buf( ber );
 253
 254         if ( ret < 0 ) {
 255                 Debug( LDAP_DEBUG_TRACE,
 256                         "syncprov_done_ctrl: ber_flatten2 failed\n",
 257                         0, 0, 0 );
 258                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 259                 return ret;
 260         }
 261
 262         return LDAP_SUCCESS;
 263 }
 264
 265 static int
 266 syncprov_sendinfo(
 267         Operation       *op,
 268         SlapReply       *rs,
 269         int                     type,
 270         struct berval *cookie,
 271         int                     refreshDone,
 272         BerVarray       syncUUIDs,
 273         int                     refreshDeletes )
 274 {
 275         BerElementBuffer berbuf;
 276         BerElement *ber = (BerElement *)&berbuf;
 277         struct berval rspdata;
 278
 279         int ret;
 280
 281         ber_init2( ber, NULL, LBER_USE_DER );
 282         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 283
 284         if ( type ) {
 285                 switch ( type ) {
 286                 case LDAP_TAG_SYNC_NEW_COOKIE:
 287                         ber_printf( ber, "tO", type, cookie );
 288                         break;
 289                 case LDAP_TAG_SYNC_REFRESH_DELETE:
 290                 case LDAP_TAG_SYNC_REFRESH_PRESENT:
 291                         ber_printf( ber, "t{", type );
 292                         if ( cookie ) {
 293                                 ber_printf( ber, "O", cookie );
 294                         }
 295                         if ( refreshDone == 0 ) {
 296                                 ber_printf( ber, "b", refreshDone );
 297                         }
 298                         ber_printf( ber, "N}" );
 299                         break;
 300                 case LDAP_TAG_SYNC_ID_SET:
 301                         ber_printf( ber, "t{", type );
 302                         if ( cookie ) {
 303                                 ber_printf( ber, "O", cookie );
 304                         }
 305                         if ( refreshDeletes == 1 ) {
 306                                 ber_printf( ber, "b", refreshDeletes );
 307                         }
 308                         ber_printf( ber, "[W]", syncUUIDs );
 309                         ber_printf( ber, "N}" );
 310                         break;
 311                 default:
 312                         Debug( LDAP_DEBUG_TRACE,
 313                                 "syncprov_sendinfo: invalid syncinfo type (%d)\n",
 314                                 type, 0, 0 );
 315                         return LDAP_OTHER;
 316                 }
 317         }
 318
 319         ret = ber_flatten2( ber, &rspdata, 0 );
 320
 321         if ( ret < 0 ) {
 322                 Debug( LDAP_DEBUG_TRACE,
 323                         "syncprov_sendinfo: ber_flatten2 failed\n",
 324                         0, 0, 0 );
 325                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 326                 return ret;
 327         }
 328
 329         rs->sr_rspoid = LDAP_SYNC_INFO;
 330         rs->sr_rspdata = &rspdata;
 331         send_ldap_intermediate( op, rs );
 332         rs->sr_rspdata = NULL;
 333         ber_free_buf( ber );
 334
 335         return LDAP_SUCCESS;
 336 }
 337
 338 /* Find a modtarget in an AVL tree */
 339 static int
 340 sp_avl_cmp( const void *c1, const void *c2 )
 341 {
 342         const modtarget *m1, *m2;
 343         int rc;
 344
 345         m1 = c1; m2 = c2;
 346         rc = m1->mt_op->o_req_ndn.bv_len - m2->mt_op->o_req_ndn.bv_len;
 347
 348         if ( rc ) return rc;
 349         return ber_bvcmp( &m1->mt_op->o_req_ndn, &m2->mt_op->o_req_ndn );
 350 }
 351
 352 /* syncprov_findbase:
 353  *   finds the true DN of the base of a search (with alias dereferencing) and
 354  * checks to make sure the base entry doesn't get replaced with a different
 355  * entry (e.g., swapping trees via ModDN, or retargeting an alias). If a
 356  * change is detected, any persistent search on this base must be terminated /
 357  * reloaded.
 358  *   On the first call, we just save the DN and entryID. On subsequent calls
 359  * we compare the DN and entryID with the saved values.
 360  */
 361 static int
 362 findbase_cb( Operation *op, SlapReply *rs )
 363 {
 364         slap_callback *sc = op->o_callback;
 365
 366         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 367                 fbase_cookie *fc = sc->sc_private;
 368
 369                 /* If no entryID, we're looking for the first time.
 370                  * Just store whatever we got.
 371                  */
 372                 if ( fc->fss->s_eid == NOID ) {
 373                         fc->fbase = 2;
 374                         fc->fss->s_eid = rs->sr_entry->e_id;
 375                         ber_dupbv( &fc->fss->s_base, &rs->sr_entry->e_nname );
 376
 377                 } else if ( rs->sr_entry->e_id == fc->fss->s_eid &&
 378                         dn_match( &rs->sr_entry->e_nname, &fc->fss->s_base )) {
 379
 380                 /* OK, the DN is the same and the entryID is the same. */
 381                         fc->fbase = 1;
 382                 }
 383         }
 384         if ( rs->sr_err != LDAP_SUCCESS ) {
 385                 Debug( LDAP_DEBUG_ANY, "findbase failed! %d\n", rs->sr_err,0,0 );
 386         }
 387         return LDAP_SUCCESS;
 388 }
 389
 390 static Filter generic_filter = { LDAP_FILTER_PRESENT, { 0 }, NULL };
 391 static struct berval generic_filterstr = BER_BVC("(objectclass=*)");
 392
 393 static int
 394 syncprov_findbase( Operation *op, fbase_cookie *fc )
 395 {
 396         opcookie *opc = op->o_callback->sc_private;
 397         slap_overinst *on = opc->son;
 398
 399         /* Use basic parameters from syncrepl search, but use
 400          * current op's threadctx / tmpmemctx
 401          */
 402         ldap_pvt_thread_mutex_lock( &fc->fss->s_mutex );
 403         if ( fc->fss->s_flags & PS_FIND_BASE ) {
 404                 slap_callback cb = {0};
 405                 Operation fop;
 406                 SlapReply frs = { REP_RESULT };
 407                 BackendInfo *bi;
 408                 int rc;
 409
 410                 fc->fss->s_flags ^= PS_FIND_BASE;
 411                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 412
 413                 fop = *fc->fss->s_op;
 414
 415                 fop.o_hdr = op->o_hdr;
 416                 fop.o_bd = op->o_bd;
 417                 fop.o_time = op->o_time;
 418                 fop.o_tincr = op->o_tincr;
 419                 bi = op->o_bd->bd_info;
 420
 421                 cb.sc_response = findbase_cb;
 422                 cb.sc_private = fc;
 423
 424                 fop.o_sync_mode = 0;    /* turn off sync mode */
 425                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 426                 fop.o_callback = &cb;
 427                 fop.o_tag = LDAP_REQ_SEARCH;
 428                 fop.ors_scope = LDAP_SCOPE_BASE;
 429                 fop.ors_limit = NULL;
 430                 fop.ors_slimit = 1;
 431                 fop.ors_tlimit = SLAP_NO_LIMIT;
 432                 fop.ors_attrs = slap_anlist_no_attrs;
 433                 fop.ors_attrsonly = 1;
 434                 fop.ors_filter = &generic_filter;
 435                 fop.ors_filterstr = generic_filterstr;
 436
 437                 rc = overlay_op_walk( &fop, &frs, op_search, on->on_info, on );
 438                 op->o_bd->bd_info = bi;
 439         } else {
 440                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 441                 fc->fbase = 1;
 442         }
 443
 444         /* After the first call, see if the fdn resides in the scope */
 445         if ( fc->fbase == 1 ) {
 446                 switch ( fc->fss->s_op->ors_scope ) {
 447                 case LDAP_SCOPE_BASE:
 448                         fc->fscope = dn_match( fc->fdn, &fc->fss->s_base );
 449                         break;
 450                 case LDAP_SCOPE_ONELEVEL: {
 451                         struct berval pdn;
 452                         dnParent( fc->fdn, &pdn );
 453                         fc->fscope = dn_match( &pdn, &fc->fss->s_base );
 454                         break; }
 455                 case LDAP_SCOPE_SUBTREE:
 456                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base );
 457                         break;
 458                 case LDAP_SCOPE_SUBORDINATE:
 459                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base ) &&
 460                                 !dn_match( fc->fdn, &fc->fss->s_base );
 461                         break;
 462                 }
 463         }
 464
 465         if ( fc->fbase )
 466                 return LDAP_SUCCESS;
 467
 468         /* If entryID has changed, then the base of this search has
 469          * changed. Invalidate the psearch.
 470          */
 471         return LDAP_NO_SUCH_OBJECT;
 472 }
 473
 474 /* syncprov_findcsn:
 475  *   This function has three different purposes, but they all use a search
 476  * that filters on entryCSN so they're combined here.
 477  * 1: at startup time, after a contextCSN has been read from the database,
 478  * we search for all entries with CSN >= contextCSN in case the contextCSN
 479  * was not checkpointed at the previous shutdown.
 480  *
 481  * 2: when the current contextCSN is known and we have a sync cookie, we search
 482  * for one entry with CSN = the cookie CSN. If not found, try <= cookie CSN.
 483  * If an entry is found, the cookie CSN is valid, otherwise it is stale.
 484  *
 485  * 3: during a refresh phase, we search for all entries with CSN <= the cookie
 486  * CSN, and generate Present records for them. We always collect this result
 487  * in SyncID sets, even if there's only one match.
 488  */
 489 typedef enum find_csn_t {
 490         FIND_MAXCSN     = 1,
 491         FIND_CSN        = 2,
 492         FIND_PRESENT    = 3
 493 } find_csn_t;
 494
 495 static int
 496 findmax_cb( Operation *op, SlapReply *rs )
 497 {
 498         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 499                 struct berval *maxcsn = op->o_callback->sc_private;
 500                 Attribute *a = attr_find( rs->sr_entry->e_attrs,
 501                         slap_schema.si_ad_entryCSN );
 502
 503                 if ( a && ber_bvcmp( &a->a_vals[0], maxcsn ) > 0 ) {
 504                         maxcsn->bv_len = a->a_vals[0].bv_len;
 505                         strcpy( maxcsn->bv_val, a->a_vals[0].bv_val );
 506                 }
 507         }
 508         return LDAP_SUCCESS;
 509 }
 510
 511 static int
 512 findcsn_cb( Operation *op, SlapReply *rs )
 513 {
 514         slap_callback *sc = op->o_callback;
 515
 516         /* We just want to know that at least one exists, so it's OK if
 517          * we exceed the unchecked limit.
 518          */
 519         if ( rs->sr_err == LDAP_ADMINLIMIT_EXCEEDED ||
 520                 (rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS )) {
 521                 sc->sc_private = (void *)1;
 522         }
 523         return LDAP_SUCCESS;
 524 }
 525
 526 /* Build a list of entryUUIDs for sending in a SyncID set */
 527
 528 #define UUID_LEN        16
 529
 530 typedef struct fpres_cookie {
 531         int num;
 532         BerVarray uuids;
 533         char *last;
 534 } fpres_cookie;
 535
 536 static int
 537 findpres_cb( Operation *op, SlapReply *rs )
 538 {
 539         slap_callback *sc = op->o_callback;
 540         fpres_cookie *pc = sc->sc_private;
 541         Attribute *a;
 542         int ret = SLAP_CB_CONTINUE;
 543
 544         switch ( rs->sr_type ) {
 545         case REP_SEARCH:
 546                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryUUID );
 547                 if ( a ) {
 548                         pc->uuids[pc->num].bv_val = pc->last;
 549                         AC_MEMCPY( pc->uuids[pc->num].bv_val, a->a_nvals[0].bv_val,
 550                                 pc->uuids[pc->num].bv_len );
 551                         pc->num++;
 552                         pc->last = pc->uuids[pc->num].bv_val;
 553                         pc->uuids[pc->num].bv_val = NULL;
 554                 }
 555                 ret = LDAP_SUCCESS;
 556                 if ( pc->num != SLAP_SYNCUUID_SET_SIZE )
 557                         break;
 558                 /* FALLTHRU */
 559         case REP_RESULT:
 560                 ret = rs->sr_err;
 561                 if ( pc->num ) {
 562                         ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 563                                 0, pc->uuids, 0 );
 564                         pc->uuids[pc->num].bv_val = pc->last;
 565                         pc->num = 0;
 566                         pc->last = pc->uuids[0].bv_val;
 567                 }
 568                 break;
 569         default:
 570                 break;
 571         }
 572         return ret;
 573 }
 574
 575 static int
 576 syncprov_findcsn( Operation *op, find_csn_t mode )
 577 {
 578         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 579         syncprov_info_t         *si = on->on_bi.bi_private;
 580
 581         slap_callback cb = {0};
 582         Operation fop;
 583         SlapReply frs = { REP_RESULT };
 584         char buf[LDAP_LUTIL_CSNSTR_BUFSIZE + STRLENOF("(entryCSN<=)")];
 585         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 586         struct berval maxcsn;
 587         Filter cf;
 588         AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
 589         fpres_cookie pcookie;
 590         sync_control *srs = NULL;
 591         struct slap_limits_set fc_limits;
 592         int i, rc = LDAP_SUCCESS, findcsn_retry = 1;
 593         int maxid = 0;
 594
 595         if ( mode != FIND_MAXCSN ) {
 596                 srs = op->o_controls[slap_cids.sc_LDAPsync];
 597         }
 598
 599         fop = *op;
 600         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync_mode */
 601         /* We want pure entries, not referrals */
 602         fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 603
 604         cf.f_ava = &eq;
 605         cf.f_av_desc = slap_schema.si_ad_entryCSN;
 606         BER_BVZERO( &cf.f_av_value );
 607         cf.f_next = NULL;
 608
 609         fop.o_callback = &cb;
 610         fop.ors_limit = NULL;
 611         fop.ors_tlimit = SLAP_NO_LIMIT;
 612         fop.ors_filter = &cf;
 613         fop.ors_filterstr.bv_val = buf;
 614
 615 again:
 616         switch( mode ) {
 617         case FIND_MAXCSN:
 618                 cf.f_choice = LDAP_FILTER_GE;
 619                 cf.f_av_value = si->si_ctxcsn[0];
 620                 /* If there are multiple CSNs, use the largest */
 621                 for ( i=1; i<si->si_numcsns; i++) {
 622                         if ( ber_bvcmp( &cf.f_av_value, &si->si_ctxcsn[i] ) < 0 ) {
 623                                 cf.f_av_value = si->si_ctxcsn[i];
 624                                 maxid = i;
 625                         }
 626                 }
 627                 fop.ors_filterstr.bv_len = sprintf( buf, "(entryCSN>=%s)",
 628                         cf.f_av_value.bv_val );
 629                 fop.ors_attrsonly = 0;
 630                 fop.ors_attrs = csn_anlist;
 631                 fop.ors_slimit = SLAP_NO_LIMIT;
 632                 cb.sc_private = &maxcsn;
 633                 cb.sc_response = findmax_cb;
 634                 strcpy( cbuf, cf.f_av_value.bv_val );
 635                 maxcsn.bv_val = cbuf;
 636                 maxcsn.bv_len = cf.f_av_value.bv_len;
 637                 break;
 638         case FIND_CSN:
 639                 if ( BER_BVISEMPTY( &cf.f_av_value )) {
 640                         cf.f_av_value = srs->sr_state.ctxcsn[0];
 641                         /* If there are multiple CSNs, use the smallest */
 642                         for ( i=1; i<srs->sr_state.numcsns; i++ ) {
 643                                 if ( ber_bvcmp( &cf.f_av_value, &srs->sr_state.ctxcsn[i] )
 644                                         > 0 ) {
 645                                         cf.f_av_value = srs->sr_state.ctxcsn[i];
 646                                 }
 647                         }
 648                 }
 649                 /* Look for exact match the first time */
 650                 if ( findcsn_retry ) {
 651                         cf.f_choice = LDAP_FILTER_EQUALITY;
 652                         fop.ors_filterstr.bv_len = sprintf( buf, "(entryCSN=%s)",
 653                                 cf.f_av_value.bv_val );
 654                 /* On retry, look for <= */
 655                 } else {
 656                         cf.f_choice = LDAP_FILTER_LE;
 657                         fop.ors_limit = &fc_limits;
 658                         memset( &fc_limits, 0, sizeof( fc_limits ));
 659                         fc_limits.lms_s_unchecked = 1;
 660                         fop.ors_filterstr.bv_len = sprintf( buf, "(entryCSN<=%s)",
 661                                 cf.f_av_value.bv_val );
 662                 }
 663                 fop.ors_attrsonly = 1;
 664                 fop.ors_attrs = slap_anlist_no_attrs;
 665                 fop.ors_slimit = 1;
 666                 cb.sc_private = NULL;
 667                 cb.sc_response = findcsn_cb;
 668                 break;
 669         case FIND_PRESENT:
 670                 fop.ors_filter = op->ors_filter;
 671                 fop.ors_filterstr = op->ors_filterstr;
 672                 fop.ors_attrsonly = 0;
 673                 fop.ors_attrs = uuid_anlist;
 674                 fop.ors_slimit = SLAP_NO_LIMIT;
 675                 cb.sc_private = &pcookie;
 676                 cb.sc_response = findpres_cb;
 677                 pcookie.num = 0;
 678
 679                 /* preallocate storage for a full set */
 680                 pcookie.uuids = op->o_tmpalloc( (SLAP_SYNCUUID_SET_SIZE+1) *
 681                         sizeof(struct berval) + SLAP_SYNCUUID_SET_SIZE * UUID_LEN,
 682                         op->o_tmpmemctx );
 683                 pcookie.last = (char *)(pcookie.uuids + SLAP_SYNCUUID_SET_SIZE+1);
 684                 pcookie.uuids[0].bv_val = pcookie.last;
 685                 pcookie.uuids[0].bv_len = UUID_LEN;
 686                 for (i=1; i<SLAP_SYNCUUID_SET_SIZE; i++) {
 687                         pcookie.uuids[i].bv_val = pcookie.uuids[i-1].bv_val + UUID_LEN;
 688                         pcookie.uuids[i].bv_len = UUID_LEN;
 689                 }
 690                 break;
 691         }
 692
 693         fop.o_bd->bd_info = on->on_info->oi_orig;
 694         fop.o_bd->be_search( &fop, &frs );
 695         fop.o_bd->bd_info = (BackendInfo *)on;
 696
 697         switch( mode ) {
 698         case FIND_MAXCSN:
 699                 if ( ber_bvcmp( &si->si_ctxcsn[maxid], &maxcsn )) {
 700                         ber_bvreplace( &si->si_ctxcsn[maxid], &maxcsn );
 701                         si->si_numops++;        /* ensure a checkpoint */
 702                 }
 703                 break;
 704         case FIND_CSN:
 705                 /* If matching CSN was not found, invalidate the context. */
 706                 if ( !cb.sc_private ) {
 707                         /* If we didn't find an exact match, then try for <= */
 708                         if ( findcsn_retry ) {
 709                                 findcsn_retry = 0;
 710                                 goto again;
 711                         }
 712                         rc = LDAP_NO_SUCH_OBJECT;
 713                 }
 714                 break;
 715         case FIND_PRESENT:
 716                 op->o_tmpfree( pcookie.uuids, op->o_tmpmemctx );
 717                 break;
 718         }
 719
 720         return rc;
 721 }
 722
 723 static void
 724 syncprov_free_syncop( syncops *so )
 725 {
 726         syncres *sr, *srnext;
 727         GroupAssertion *ga, *gnext;
 728
 729         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 730         if ( --so->s_inuse > 0 ) {
 731                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 732                 return;
 733         }
 734         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 735         if ( so->s_flags & PS_IS_DETACHED ) {
 736                 filter_free( so->s_op->ors_filter );
 737                 for ( ga = so->s_op->o_groups; ga; ga=gnext ) {
 738                         gnext = ga->ga_next;
 739                         ch_free( ga );
 740                 }
 741                 ch_free( so->s_op );
 742         }
 743         ch_free( so->s_base.bv_val );
 744         for ( sr=so->s_res; sr; sr=srnext ) {
 745                 srnext = sr->s_next;
 746                 ch_free( sr );
 747         }
 748         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 749         ch_free( so );
 750 }
 751
 752 /* Send a persistent search response */
 753 static int
 754 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so,
 755         Entry **e, int mode )
 756 {
 757         slap_overinst *on = opc->son;
 758
 759         SlapReply rs = { REP_SEARCH };
 760         LDAPControl *ctrls[2];
 761         struct berval cookie, csns[2];
 762         Entry e_uuid = {0};
 763         Attribute a_uuid = {0};
 764
 765         if ( so->s_op->o_abandon )
 766                 return SLAPD_ABANDON;
 767
 768         ctrls[1] = NULL;
 769         csns[0] = opc->sctxcsn;
 770         BER_BVZERO( &csns[1] );
 771         slap_compose_sync_cookie( op, &cookie, csns, so->s_rid, so->s_sid );
 772
 773         Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: cookie=%s\n", cookie.bv_val, 0, 0 );
 774
 775         e_uuid.e_attrs = &a_uuid;
 776         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 777         a_uuid.a_nvals = &opc->suuid;
 778         rs.sr_err = syncprov_state_ctrl( op, &rs, &e_uuid,
 779                 mode, ctrls, 0, 1, &cookie );
 780         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
 781
 782         rs.sr_ctrls = ctrls;
 783         op->o_bd->bd_info = (BackendInfo *)on->on_info;
 784         switch( mode ) {
 785         case LDAP_SYNC_ADD:
 786                 rs.sr_entry = *e;
 787                 if ( rs.sr_entry->e_private )
 788                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 789                 if ( opc->sreference ) {
 790                         rs.sr_ref = get_entry_referrals( op, rs.sr_entry );
 791                         rs.sr_err = send_search_reference( op, &rs );
 792                         ber_bvarray_free( rs.sr_ref );
 793                         if ( !rs.sr_entry )
 794                                 *e = NULL;
 795                         break;
 796                 }
 797                 /* fallthru */
 798         case LDAP_SYNC_MODIFY:
 799                 rs.sr_entry = *e;
 800                 if ( rs.sr_entry->e_private )
 801                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 802                 rs.sr_attrs = op->ors_attrs;
 803                 rs.sr_err = send_search_entry( op, &rs );
 804                 if ( !rs.sr_entry )
 805                         *e = NULL;
 806                 break;
 807         case LDAP_SYNC_DELETE:
 808                 e_uuid.e_attrs = NULL;
 809                 e_uuid.e_name = opc->sdn;
 810                 e_uuid.e_nname = opc->sndn;
 811                 rs.sr_entry = &e_uuid;
 812                 if ( opc->sreference ) {
 813                         struct berval bv = BER_BVNULL;
 814                         rs.sr_ref = &bv;
 815                         rs.sr_err = send_search_reference( op, &rs );
 816                 } else {
 817                         rs.sr_err = send_search_entry( op, &rs );
 818                 }
 819                 break;
 820         default:
 821                 assert(0);
 822         }
 823         /* In case someone else freed it already? */
 824         if ( rs.sr_ctrls ) {
 825                 op->o_tmpfree( rs.sr_ctrls[0], op->o_tmpmemctx );
 826                 rs.sr_ctrls = NULL;
 827         }
 828
 829         return rs.sr_err;
 830 }
 831
 832 /* Play back queued responses */
 833 static int
 834 syncprov_qplay( Operation *op, slap_overinst *on, syncops *so )
 835 {
 836         syncres *sr;
 837         Entry *e;
 838         opcookie opc;
 839         int rc = 0;
 840
 841         opc.son = on;
 842
 843         for (;;) {
 844                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 845                 sr = so->s_res;
 846                 if ( sr )
 847                         so->s_res = sr->s_next;
 848                 if ( !so->s_res )
 849                         so->s_restail = NULL;
 850                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 851
 852                 if ( !sr || so->s_op->o_abandon )
 853                         break;
 854
 855                 opc.sdn = sr->s_dn;
 856                 opc.sndn = sr->s_ndn;
 857                 opc.suuid = sr->s_uuid;
 858                 opc.sctxcsn = sr->s_csn;
 859                 opc.sreference = sr->s_isreference;
 860                 e = NULL;
 861
 862                 if ( sr->s_mode != LDAP_SYNC_DELETE ) {
 863                         rc = overlay_entry_get_ov( op, &opc.sndn, NULL, NULL, 0, &e, on );
 864                         if ( rc ) {
 865                                 Debug( LDAP_DEBUG_SYNC, "syncprov_qplay: failed to get %s, "
 866                                         "error (%d), ignoring...\n", opc.sndn.bv_val, rc, 0 );
 867                                 ch_free( sr );
 868                                 rc = 0;
 869                                 continue;
 870                         }
 871                 }
 872                 rc = syncprov_sendresp( op, &opc, so, &e, sr->s_mode );
 873
 874                 if ( e ) {
 875                         overlay_entry_release_ov( op, e, 0, on );
 876                 }
 877
 878                 ch_free( sr );
 879
 880                 if ( rc )
 881                         break;
 882         }
 883         return rc;
 884 }
 885
 886 /* runqueue task for playing back queued responses */
 887 static void *
 888 syncprov_qtask( void *ctx, void *arg )
 889 {
 890         struct re_s *rtask = arg;
 891         syncops *so = rtask->arg;
 892         slap_overinst *on = so->s_op->o_private;
 893         OperationBuffer opbuf;
 894         Operation *op;
 895         BackendDB be;
 896         int rc;
 897
 898         op = &opbuf.ob_op;
 899         *op = *so->s_op;
 900         op->o_hdr = &opbuf.ob_hdr;
 901         op->o_controls = opbuf.ob_controls;
 902         memset( op->o_controls, 0, sizeof(opbuf.ob_controls) );
 903
 904         *op->o_hdr = *so->s_op->o_hdr;
 905
 906         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx, 1);
 907         op->o_tmpmfuncs = &slap_sl_mfuncs;
 908         op->o_threadctx = ctx;
 909
 910         /* syncprov_qplay expects a fake db */
 911         be = *so->s_op->o_bd;
 912         be.be_flags |= SLAP_DBFLAG_OVERLAY;
 913         op->o_bd = &be;
 914         op->o_private = NULL;
 915         op->o_callback = NULL;
 916
 917         rc = syncprov_qplay( op, on, so );
 918
 919         /* decrement use count... */
 920         syncprov_free_syncop( so );
 921
 922         /* wait until we get explicitly scheduled again */
 923         ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
 924         ldap_pvt_runqueue_stoptask( &slapd_rq, rtask );
 925         if ( rc == 0 ) {
 926                 ldap_pvt_runqueue_resched( &slapd_rq, rtask, 1 );
 927         } else {
 928                 /* bail out on any error */
 929                 ldap_pvt_runqueue_remove( &slapd_rq, rtask );
 930         }
 931         ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
 932
 933 #if 0   /* FIXME: connection_close isn't exported from slapd.
 934                  * should it be?
 935                  */
 936         if ( rc ) {
 937                 ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
 938                 if ( connection_state_closing( op->o_conn )) {
 939                         connection_close( op->o_conn );
 940                 }
 941                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
 942         }
 943 #endif
 944         return NULL;
 945 }
 946
 947 /* Start the task to play back queued psearch responses */
 948 static void
 949 syncprov_qstart( syncops *so )
 950 {
 951         int wake=0;
 952         ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
 953         if ( !so->s_qtask ) {
 954                 so->s_qtask = ldap_pvt_runqueue_insert( &slapd_rq, RUNQ_INTERVAL,
 955                         syncprov_qtask, so, "syncprov_qtask",
 956                         so->s_op->o_conn->c_peer_name.bv_val );
 957                 ++so->s_inuse;
 958                 wake = 1;
 959         } else {
 960                 if (!ldap_pvt_runqueue_isrunning( &slapd_rq, so->s_qtask ) &&
 961                         !so->s_qtask->next_sched.tv_sec ) {
 962                         so->s_qtask->interval.tv_sec = 0;
 963                         ldap_pvt_runqueue_resched( &slapd_rq, so->s_qtask, 0 );
 964                         so->s_qtask->interval.tv_sec = RUNQ_INTERVAL;
 965                         ++so->s_inuse;
 966                         wake = 1;
 967                 }
 968         }
 969         ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
 970         if ( wake )
 971                 slap_wake_listener();
 972 }
 973
 974 /* Queue a persistent search response */
 975 static int
 976 syncprov_qresp( opcookie *opc, syncops *so, int mode )
 977 {
 978         syncres *sr;
 979         int sid, srsize;
 980
 981         /* Don't send changes back to their originator */
 982         sid = slap_parse_csn_sid( &opc->sctxcsn );
 983         if ( sid >= 0 && sid == so->s_sid )
 984                 return LDAP_SUCCESS;
 985
 986         srsize = sizeof(syncres) + opc->suuid.bv_len + 1 +
 987                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1;
 988         if ( opc->sctxcsn.bv_len )
 989                 srsize += opc->sctxcsn.bv_len + 1;
 990         sr = ch_malloc( srsize );
 991         sr->s_next = NULL;
 992         sr->s_dn.bv_val = (char *)(sr + 1);
 993         sr->s_dn.bv_len = opc->sdn.bv_len;
 994         sr->s_mode = mode;
 995         sr->s_isreference = opc->sreference;
 996         sr->s_ndn.bv_val = lutil_strcopy( sr->s_dn.bv_val,
 997                  opc->sdn.bv_val ) + 1;
 998         sr->s_ndn.bv_len = opc->sndn.bv_len;
 999         sr->s_uuid.bv_val = lutil_strcopy( sr->s_ndn.bv_val,
1000                  opc->sndn.bv_val ) + 1;
1001         sr->s_uuid.bv_len = opc->suuid.bv_len;
1002         AC_MEMCPY( sr->s_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1003         if ( opc->sctxcsn.bv_len ) {
1004                 sr->s_csn.bv_val = sr->s_uuid.bv_val + sr->s_uuid.bv_len + 1;
1005                 strcpy( sr->s_csn.bv_val, opc->sctxcsn.bv_val );
1006         } else {
1007                 sr->s_csn.bv_val = NULL;
1008         }
1009         sr->s_csn.bv_len = opc->sctxcsn.bv_len;
1010
1011         ldap_pvt_thread_mutex_lock( &so->s_mutex );
1012         if ( !so->s_res ) {
1013                 so->s_res = sr;
1014         } else {
1015                 so->s_restail->s_next = sr;
1016         }
1017         so->s_restail = sr;
1018
1019         /* If the base of the psearch was modified, check it next time round */
1020         if ( so->s_flags & PS_WROTE_BASE ) {
1021                 so->s_flags ^= PS_WROTE_BASE;
1022                 so->s_flags |= PS_FIND_BASE;
1023         }
1024         if ( so->s_flags & PS_IS_DETACHED ) {
1025                 syncprov_qstart( so );
1026         }
1027         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
1028         return LDAP_SUCCESS;
1029 }
1030
1031 static int
1032 syncprov_drop_psearch( syncops *so, int lock )
1033 {
1034         if ( so->s_flags & PS_IS_DETACHED ) {
1035                 if ( lock )
1036                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
1037                 so->s_op->o_conn->c_n_ops_executing--;
1038                 so->s_op->o_conn->c_n_ops_completed++;
1039                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, Operation,
1040                         o_next );
1041                 if ( lock )
1042                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
1043         }
1044         syncprov_free_syncop( so );
1045
1046         return 0;
1047 }
1048
1049 static int
1050 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
1051 {
1052         slap_callback *sc = op->o_callback;
1053         op->o_callback = sc->sc_next;
1054         syncprov_drop_psearch( op->o_callback->sc_private, 0 );
1055         op->o_tmpfree( sc, op->o_tmpmemctx );
1056         return 0;
1057 }
1058
1059 static int
1060 syncprov_op_abandon( Operation *op, SlapReply *rs )
1061 {
1062         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1063         syncprov_info_t         *si = on->on_bi.bi_private;
1064         syncops *so, *soprev;
1065
1066         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1067         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
1068                 soprev=so, so=so->s_next ) {
1069                 if ( so->s_op->o_connid == op->o_connid &&
1070                         so->s_op->o_msgid == op->orn_msgid ) {
1071                                 so->s_op->o_abandon = 1;
1072                                 soprev->s_next = so->s_next;
1073                                 break;
1074                 }
1075         }
1076         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1077         if ( so ) {
1078                 /* Is this really a Cancel exop? */
1079                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
1080                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
1081                         rs->sr_err = LDAP_CANCELLED;
1082                         send_ldap_result( so->s_op, rs );
1083                         if ( so->s_flags & PS_IS_DETACHED ) {
1084                                 slap_callback *cb;
1085                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
1086                                 cb->sc_cleanup = syncprov_ab_cleanup;
1087                                 cb->sc_next = op->o_callback;
1088                                 cb->sc_private = so;
1089                                 return SLAP_CB_CONTINUE;
1090                         }
1091                 }
1092                 syncprov_drop_psearch( so, 0 );
1093         }
1094         return SLAP_CB_CONTINUE;
1095 }
1096
1097 /* Find which persistent searches are affected by this operation */
1098 static void
1099 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
1100 {
1101         slap_overinst *on = opc->son;
1102         syncprov_info_t         *si = on->on_bi.bi_private;
1103
1104         fbase_cookie fc;
1105         syncops *ss, *sprev, *snext;
1106         Entry *e = NULL;
1107         Attribute *a;
1108         int rc;
1109         struct berval newdn;
1110         int freefdn = 0;
1111         BackendDB *b0 = op->o_bd, db;
1112
1113         fc.fdn = &op->o_req_ndn;
1114         /* compute new DN */
1115         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1116                 struct berval pdn;
1117                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
1118                 else dnParent( fc.fdn, &pdn );
1119                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
1120                 fc.fdn = &newdn;
1121                 freefdn = 1;
1122         }
1123         if ( op->o_tag != LDAP_REQ_ADD ) {
1124                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1125                         db = *op->o_bd;
1126                         op->o_bd = &db;
1127                 }
1128                 rc = overlay_entry_get_ov( op, fc.fdn, NULL, NULL, 0, &e, on );
1129                 /* If we're sending responses now, make a copy and unlock the DB */
1130                 if ( e && !saveit ) {
1131                         Entry *e2 = entry_dup( e );
1132                         overlay_entry_release_ov( op, e, 0, on );
1133                         e = e2;
1134                 }
1135                 if ( rc ) {
1136                         op->o_bd = b0;
1137                         return;
1138                 }
1139         } else {
1140                 e = op->ora_e;
1141         }
1142
1143         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1144                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1145                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1146                 opc->sreference = is_entry_referral( e );
1147                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1148                 if ( a )
1149                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1150         } else if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1151                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1152                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1153                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1154                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1155         }
1156
1157         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1158         for (ss = si->si_ops, sprev = (syncops *)&si->si_ops; ss;
1159                 sprev = ss, ss=snext)
1160         {
1161                 syncmatches *sm;
1162                 int found = 0;
1163
1164                 snext = ss->s_next;
1165                 /* validate base */
1166                 fc.fss = ss;
1167                 fc.fbase = 0;
1168                 fc.fscope = 0;
1169
1170                 /* If the base of the search is missing, signal a refresh */
1171                 rc = syncprov_findbase( op, &fc );
1172                 if ( rc != LDAP_SUCCESS ) {
1173                         SlapReply rs = {REP_RESULT};
1174                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1175                                 "search base has changed" );
1176                         sprev->s_next = snext;
1177                         syncprov_drop_psearch( ss, 1 );
1178                         ss = sprev;
1179                         continue;
1180                 }
1181
1182
1183                 /* If we're sending results now, look for this op in old matches */
1184                 if ( !saveit ) {
1185                         syncmatches *old;
1186
1187                         /* Did we modify the search base? */
1188                         if ( dn_match( &op->o_req_ndn, &ss->s_base )) {
1189                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1190                                 ss->s_flags |= PS_WROTE_BASE;
1191                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1192                         }
1193
1194                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1195                                 old=sm, sm=sm->sm_next ) {
1196                                 if ( sm->sm_op == ss ) {
1197                                         found = 1;
1198                                         old->sm_next = sm->sm_next;
1199                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1200                                         break;
1201                                 }
1202                         }
1203                 }
1204
1205                 /* check if current o_req_dn is in scope and matches filter */
1206                 if ( fc.fscope && test_filter( op, e, ss->s_op->ors_filter ) ==
1207                         LDAP_COMPARE_TRUE ) {
1208                         if ( saveit ) {
1209                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1210                                 sm->sm_next = opc->smatches;
1211                                 sm->sm_op = ss;
1212                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1213                                 ++ss->s_inuse;
1214                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1215                                 opc->smatches = sm;
1216                         } else {
1217                                 /* if found send UPDATE else send ADD */
1218                                 syncprov_qresp( opc, ss,
1219                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD );
1220                         }
1221                 } else if ( !saveit && found ) {
1222                         /* send DELETE */
1223                         syncprov_qresp( opc, ss, LDAP_SYNC_DELETE );
1224                 }
1225         }
1226         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1227
1228         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1229                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1230                         op->o_bd = &db;
1231                 }
1232                 overlay_entry_release_ov( op, e, 0, on );
1233                 op->o_bd = b0;
1234         }
1235         if ( freefdn ) {
1236                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1237         }
1238         op->o_bd = b0;
1239 }
1240
1241 static int
1242 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1243 {
1244         slap_callback *cb = op->o_callback;
1245         opcookie *opc = cb->sc_private;
1246         slap_overinst *on = opc->son;
1247         syncprov_info_t         *si = on->on_bi.bi_private;
1248         syncmatches *sm, *snext;
1249         modtarget *mt, mtdummy;
1250
1251         for (sm = opc->smatches; sm; sm=snext) {
1252                 snext = sm->sm_next;
1253                 syncprov_free_syncop( sm->sm_op );
1254                 op->o_tmpfree( sm, op->o_tmpmemctx );
1255         }
1256
1257         /* Remove op from lock table */
1258         mtdummy.mt_op = op;
1259         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1260         mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1261         if ( mt ) {
1262                 modinst *mi = mt->mt_mods;
1263
1264                 /* If there are more, promote the next one */
1265                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1266                 if ( mi->mi_next ) {
1267                         mt->mt_mods = mi->mi_next;
1268                         mt->mt_op = mt->mt_mods->mi_op;
1269                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1270                 } else {
1271                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1272                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1273                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1274                         ch_free( mt );
1275                 }
1276         }
1277         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1278         if ( !BER_BVISNULL( &opc->suuid ))
1279                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1280         if ( !BER_BVISNULL( &opc->sndn ))
1281                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1282         if ( !BER_BVISNULL( &opc->sdn ))
1283                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1284         op->o_callback = cb->sc_next;
1285         op->o_tmpfree(cb, op->o_tmpmemctx);
1286
1287         return 0;
1288 }
1289
1290 static void
1291 syncprov_checkpoint( Operation *op, SlapReply *rs, slap_overinst *on )
1292 {
1293         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
1294         Modifications mod;
1295         Operation opm;
1296         SlapReply rsm = { 0 };
1297         slap_callback cb = {0};
1298
1299         mod.sml_numvals = si->si_numcsns;
1300         mod.sml_values = si->si_ctxcsn;
1301         mod.sml_nvalues = NULL;
1302         mod.sml_desc = slap_schema.si_ad_contextCSN;
1303         mod.sml_op = LDAP_MOD_REPLACE;
1304         mod.sml_flags = 0;
1305         mod.sml_next = NULL;
1306
1307         cb.sc_response = slap_null_cb;
1308         opm = *op;
1309         opm.o_tag = LDAP_REQ_MODIFY;
1310         opm.o_callback = &cb;
1311         opm.orm_modlist = &mod;
1312         opm.orm_no_opattrs = 1;
1313         opm.o_req_dn = op->o_bd->be_suffix[0];
1314         opm.o_req_ndn = op->o_bd->be_nsuffix[0];
1315         opm.o_bd->bd_info = on->on_info->oi_orig;
1316         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1317         opm.o_no_schema_check = 1;
1318         opm.o_bd->be_modify( &opm, &rsm );
1319         if ( mod.sml_next != NULL ) {
1320                 slap_mods_free( mod.sml_next, 1 );
1321         }
1322         opm.orm_no_opattrs = 0;
1323 }
1324
1325 static void
1326 syncprov_add_slog( Operation *op )
1327 {
1328         opcookie *opc = op->o_callback->sc_private;
1329         slap_overinst *on = opc->son;
1330         syncprov_info_t         *si = on->on_bi.bi_private;
1331         sessionlog *sl;
1332         slog_entry *se;
1333
1334         sl = si->si_logs;
1335         {
1336                 /* Allocate a record. UUIDs are not NUL-terminated. */
1337                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1338                         op->o_csn.bv_len + 1 );
1339                 se->se_next = NULL;
1340                 se->se_tag = op->o_tag;
1341
1342                 se->se_uuid.bv_val = (char *)(&se[1]);
1343                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1344                 se->se_uuid.bv_len = opc->suuid.bv_len;
1345
1346                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1347                 AC_MEMCPY( se->se_csn.bv_val, op->o_csn.bv_val, op->o_csn.bv_len );
1348                 se->se_csn.bv_val[op->o_csn.bv_len] = '\0';
1349                 se->se_csn.bv_len = op->o_csn.bv_len;
1350                 se->se_sid = slap_parse_csn_sid( &se->se_csn );
1351
1352                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1353                 if ( sl->sl_head ) {
1354                         sl->sl_tail->se_next = se;
1355                 } else {
1356                         sl->sl_head = se;
1357                 }
1358                 sl->sl_tail = se;
1359                 sl->sl_num++;
1360                 while ( sl->sl_num > sl->sl_size ) {
1361                         se = sl->sl_head;
1362                         sl->sl_head = se->se_next;
1363                         strcpy( sl->sl_mincsn.bv_val, se->se_csn.bv_val );
1364                         sl->sl_mincsn.bv_len = se->se_csn.bv_len;
1365                         ch_free( se );
1366                         sl->sl_num--;
1367                 }
1368                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1369         }
1370 }
1371
1372 /* Just set a flag if we found the matching entry */
1373 static int
1374 playlog_cb( Operation *op, SlapReply *rs )
1375 {
1376         if ( rs->sr_type == REP_SEARCH ) {
1377                 op->o_callback->sc_private = (void *)1;
1378         }
1379         return rs->sr_err;
1380 }
1381
1382 /* enter with sl->sl_mutex locked, release before returning */
1383 static void
1384 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1385         sync_control *srs, BerVarray ctxcsn, int numcsns, int *sids )
1386 {
1387         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1388         slog_entry *se;
1389         int i, j, ndel, num, nmods, mmods;
1390         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1391         BerVarray uuids;
1392         struct berval delcsn[2];
1393
1394         if ( !sl->sl_num ) {
1395                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1396                 return;
1397         }
1398
1399         num = sl->sl_num;
1400         i = 0;
1401         nmods = 0;
1402
1403         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1404                 num * UUID_LEN, op->o_tmpmemctx );
1405         uuids[0].bv_val = (char *)(uuids + num + 1);
1406
1407         delcsn[0].bv_len = 0;
1408         delcsn[0].bv_val = cbuf;
1409         BER_BVZERO(&delcsn[1]);
1410
1411         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1412          * and everything else at the end. Do this first so we can
1413          * unlock the list mutex.
1414          */
1415         Debug( LDAP_DEBUG_SYNC, "srs csn %s\n",
1416                 srs->sr_state.ctxcsn[0].bv_val, 0, 0 );
1417         for ( se=sl->sl_head; se; se=se->se_next ) {
1418                 int k;
1419                 Debug( LDAP_DEBUG_SYNC, "log csn %s\n", se->se_csn.bv_val, 0, 0 );
1420                 ndel = 1;
1421                 for ( k=0; k<srs->sr_state.numcsns; k++ ) {
1422                         if ( se->se_sid == srs->sr_state.sids[k] ) {
1423                                 ndel = ber_bvcmp( &se->se_csn, &srs->sr_state.ctxcsn[k] );
1424                                 break;
1425                         }
1426                 }
1427                 if ( ndel <= 0 ) {
1428                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too old\n", ndel, 0, 0 );
1429                         continue;
1430                 }
1431                 ndel = 0;
1432                 for ( k=0; k<numcsns; k++ ) {
1433                         if ( se->se_sid == sids[k] ) {
1434                                 ndel = ber_bvcmp( &se->se_csn, &ctxcsn[k] );
1435                                 break;
1436                         }
1437                 }
1438                 if ( ndel > 0 ) {
1439                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too new\n", ndel, 0, 0 );
1440                         break;
1441                 }
1442                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1443                         j = i;
1444                         i++;
1445                         AC_MEMCPY( cbuf, se->se_csn.bv_val, se->se_csn.bv_len );
1446                         delcsn[0].bv_len = se->se_csn.bv_len;
1447                         delcsn[0].bv_val[delcsn[0].bv_len] = '\0';
1448                 } else {
1449                         nmods++;
1450                         j = num - nmods;
1451                 }
1452                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1453                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1454                 uuids[j].bv_len = UUID_LEN;
1455         }
1456         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1457
1458         ndel = i;
1459
1460         /* Zero out unused slots */
1461         for ( i=ndel; i < num - nmods; i++ )
1462                 uuids[i].bv_len = 0;
1463
1464         /* Mods must be validated to see if they belong in this delete set.
1465          */
1466
1467         mmods = nmods;
1468         /* Strip any duplicates */
1469         for ( i=0; i<nmods; i++ ) {
1470                 for ( j=0; j<ndel; j++ ) {
1471                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1472                                 uuids[num - 1 - i].bv_len = 0;
1473                                 mmods --;
1474                                 break;
1475                         }
1476                 }
1477                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1478                 for ( j=0; j<i; j++ ) {
1479                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1480                                 uuids[num - 1 - i].bv_len = 0;
1481                                 mmods --;
1482                                 break;
1483                         }
1484                 }
1485         }
1486
1487         if ( mmods ) {
1488                 Operation fop;
1489                 SlapReply frs = { REP_RESULT };
1490                 int rc;
1491                 Filter mf, af;
1492                 AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
1493                 slap_callback cb = {0};
1494
1495                 fop = *op;
1496
1497                 fop.o_sync_mode = 0;
1498                 fop.o_callback = &cb;
1499                 fop.ors_limit = NULL;
1500                 fop.ors_tlimit = SLAP_NO_LIMIT;
1501                 fop.ors_attrs = slap_anlist_all_attributes;
1502                 fop.ors_attrsonly = 0;
1503                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1504
1505                 af.f_choice = LDAP_FILTER_AND;
1506                 af.f_next = NULL;
1507                 af.f_and = &mf;
1508                 mf.f_choice = LDAP_FILTER_EQUALITY;
1509                 mf.f_ava = &eq;
1510                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1511                 mf.f_next = fop.ors_filter;
1512
1513                 fop.ors_filter = &af;
1514
1515                 cb.sc_response = playlog_cb;
1516                 fop.o_bd->bd_info = on->on_info->oi_orig;
1517
1518                 for ( i=ndel; i<num; i++ ) {
1519                         if ( uuids[i].bv_len == 0 ) continue;
1520
1521                         mf.f_av_value = uuids[i];
1522                         cb.sc_private = NULL;
1523                         fop.ors_slimit = 1;
1524                         frs.sr_nentries = 0;
1525                         rc = fop.o_bd->be_search( &fop, &frs );
1526
1527                         /* If entry was not found, add to delete list */
1528                         if ( !cb.sc_private ) {
1529                                 uuids[ndel++] = uuids[i];
1530                         }
1531                 }
1532                 fop.o_bd->bd_info = (BackendInfo *)on;
1533         }
1534         if ( ndel ) {
1535                 struct berval cookie;
1536
1537                 slap_compose_sync_cookie( op, &cookie, delcsn, srs->sr_state.rid,
1538                         srs->sr_state.sid );
1539
1540                 Debug( LDAP_DEBUG_SYNC, "syncprov_playlog: cookie=%s\n", cookie.bv_val, 0, 0 );
1541
1542                 uuids[ndel].bv_val = NULL;
1543                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, &cookie, 0, uuids, 1 );
1544                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1545         }
1546         op->o_tmpfree( uuids, op->o_tmpmemctx );
1547 }
1548
1549 static int
1550 syncprov_op_response( Operation *op, SlapReply *rs )
1551 {
1552         opcookie *opc = op->o_callback->sc_private;
1553         slap_overinst *on = opc->son;
1554         syncprov_info_t         *si = on->on_bi.bi_private;
1555         syncmatches *sm;
1556
1557         if ( rs->sr_err == LDAP_SUCCESS )
1558         {
1559                 struct berval maxcsn = BER_BVNULL;
1560                 char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1561                 int do_check = 0, have_psearches;
1562
1563                 /* Update our context CSN */
1564                 cbuf[0] = '\0';
1565                 ldap_pvt_thread_rdwr_wlock( &si->si_csn_rwlock );
1566                 slap_get_commit_csn( op, &maxcsn );
1567                 if ( !BER_BVISNULL( &maxcsn ) ) {
1568                         int i, sid;
1569                         strcpy( cbuf, maxcsn.bv_val );
1570                         sid = slap_parse_csn_sid( &maxcsn );
1571                         for ( i=0; i<si->si_numcsns; i++ ) {
1572                                 if ( sid == si->si_sids[i] ) {
1573                                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn[i] ) > 0 ) {
1574                                                 ber_bvreplace( &si->si_ctxcsn[i], &maxcsn );
1575                                         }
1576                                         break;
1577                                 }
1578                         }
1579                         /* It's a new SID for us */
1580                         if ( i == si->si_numcsns ) {
1581                                 value_add_one( &si->si_ctxcsn, &maxcsn );
1582                                 si->si_numcsns++;
1583                                 si->si_sids = ch_realloc( si->si_sids, si->si_numcsns *
1584                                         sizeof(int));
1585                                 si->si_sids[i] = sid;
1586                         }
1587                 }
1588
1589                 /* Don't do any processing for consumer contextCSN updates */
1590                 if ( SLAP_SYNC_SHADOW( op->o_bd ) &&
1591                         op->o_msgid == SLAP_SYNC_UPDATE_MSGID ) {
1592                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1593                         return SLAP_CB_CONTINUE;
1594                 }
1595
1596                 si->si_numops++;
1597                 if ( si->si_chkops || si->si_chktime ) {
1598                         if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1599                                 do_check = 1;
1600                                 si->si_numops = 0;
1601                         }
1602                         if ( si->si_chktime &&
1603                                 (op->o_time - si->si_chklast >= si->si_chktime )) {
1604                                 do_check = 1;
1605                                 si->si_chklast = op->o_time;
1606                         }
1607                 }
1608                 ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1609
1610                 if ( do_check ) {
1611                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1612                         syncprov_checkpoint( op, rs, on );
1613                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1614                 }
1615
1616                 opc->sctxcsn.bv_len = maxcsn.bv_len;
1617                 opc->sctxcsn.bv_val = cbuf;
1618
1619                 /* Handle any persistent searches */
1620                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1621                 have_psearches = ( si->si_ops != NULL );
1622                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1623                 if ( have_psearches ) {
1624                         switch(op->o_tag) {
1625                         case LDAP_REQ_ADD:
1626                         case LDAP_REQ_MODIFY:
1627                         case LDAP_REQ_MODRDN:
1628                         case LDAP_REQ_EXTENDED:
1629                                 syncprov_matchops( op, opc, 0 );
1630                                 break;
1631                         case LDAP_REQ_DELETE:
1632                                 /* for each match in opc->smatches:
1633                                  *   send DELETE msg
1634                                  */
1635                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1636                                         if ( sm->sm_op->s_op->o_abandon )
1637                                                 continue;
1638                                         syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_DELETE );
1639                                 }
1640                                 break;
1641                         }
1642                 }
1643
1644                 /* Add any log records */
1645                 if ( si->si_logs && op->o_tag != LDAP_REQ_ADD ) {
1646                         syncprov_add_slog( op );
1647                 }
1648
1649         }
1650         return SLAP_CB_CONTINUE;
1651 }
1652
1653 /* We don't use a subentry to store the context CSN any more.
1654  * We expose the current context CSN as an operational attribute
1655  * of the suffix entry.
1656  */
1657 static int
1658 syncprov_op_compare( Operation *op, SlapReply *rs )
1659 {
1660         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1661         syncprov_info_t         *si = on->on_bi.bi_private;
1662         int rc = SLAP_CB_CONTINUE;
1663
1664         if ( dn_match( &op->o_req_ndn, op->o_bd->be_nsuffix ) &&
1665                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1666         {
1667                 Entry e = {0};
1668                 Attribute a = {0};
1669
1670                 e.e_name = op->o_bd->be_suffix[0];
1671                 e.e_nname = op->o_bd->be_nsuffix[0];
1672                 e.e_attrs = &a;
1673
1674                 a.a_desc = slap_schema.si_ad_contextCSN;
1675
1676                 ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1677
1678                 a.a_vals = si->si_ctxcsn;
1679                 a.a_nvals = a.a_vals;
1680
1681                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1682                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1683                 if ( ! rs->sr_err ) {
1684                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1685                         goto return_results;
1686                 }
1687
1688                 if ( get_assert( op ) &&
1689                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
1690                 {
1691                         rs->sr_err = LDAP_ASSERTION_FAILED;
1692                         goto return_results;
1693                 }
1694
1695
1696                 rs->sr_err = LDAP_COMPARE_FALSE;
1697
1698                 if ( attr_valfind( &a,
1699                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
1700                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
1701                                 &op->oq_compare.rs_ava->aa_value, NULL, op->o_tmpmemctx ) == 0 )
1702                 {
1703                         rs->sr_err = LDAP_COMPARE_TRUE;
1704                 }
1705
1706 return_results:;
1707
1708                 ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1709
1710                 send_ldap_result( op, rs );
1711
1712                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
1713                         rs->sr_err = LDAP_SUCCESS;
1714                 }
1715                 rc = rs->sr_err;
1716         }
1717
1718         return rc;
1719 }
1720
1721 static int
1722 syncprov_op_mod( Operation *op, SlapReply *rs )
1723 {
1724         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1725         syncprov_info_t         *si = on->on_bi.bi_private;
1726         slap_callback *cb;
1727         opcookie *opc;
1728         int have_psearches, cbsize;
1729
1730         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1731         have_psearches = ( si->si_ops != NULL );
1732         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1733
1734         cbsize = sizeof(slap_callback) + sizeof(opcookie) +
1735                 (have_psearches ? sizeof(modinst) : 0 );
1736
1737         cb = op->o_tmpcalloc(1, cbsize, op->o_tmpmemctx);
1738         opc = (opcookie *)(cb+1);
1739         opc->son = on;
1740         cb->sc_response = syncprov_op_response;
1741         cb->sc_cleanup = syncprov_op_cleanup;
1742         cb->sc_private = opc;
1743         cb->sc_next = op->o_callback;
1744         op->o_callback = cb;
1745
1746         /* If there are active persistent searches, lock this operation.
1747          * See seqmod.c for the locking logic on its own.
1748          */
1749         if ( have_psearches ) {
1750                 modtarget *mt, mtdummy;
1751                 modinst *mi;
1752
1753                 mi = (modinst *)(opc+1);
1754                 mi->mi_op = op;
1755
1756                 /* See if we're already modifying this entry... */
1757                 mtdummy.mt_op = op;
1758                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1759                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1760                 if ( mt ) {
1761                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1762                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1763                         mt->mt_tail->mi_next = mi;
1764                         mt->mt_tail = mi;
1765                         /* wait for this op to get to head of list */
1766                         while ( mt->mt_mods != mi ) {
1767                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1768                                 ldap_pvt_thread_yield();
1769                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1770
1771                                 /* clean up if the caller is giving up */
1772                                 if ( op->o_abandon ) {
1773                                         modinst *m2;
1774                                         for ( m2 = mt->mt_mods; m2->mi_next != mi;
1775                                                 m2 = m2->mi_next );
1776                                         m2->mi_next = mi->mi_next;
1777                                         if ( mt->mt_tail == mi ) mt->mt_tail = m2;
1778                                         op->o_tmpfree( cb, op->o_tmpmemctx );
1779                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1780                                         return SLAPD_ABANDON;
1781                                 }
1782                         }
1783                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1784                 } else {
1785                         /* Record that we're modifying this entry now */
1786                         mt = ch_malloc( sizeof(modtarget) );
1787                         mt->mt_mods = mi;
1788                         mt->mt_tail = mi;
1789                         mt->mt_op = mi->mi_op;
1790                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
1791                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
1792                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1793                 }
1794         }
1795
1796         if (( have_psearches || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
1797                 syncprov_matchops( op, opc, 1 );
1798
1799         return SLAP_CB_CONTINUE;
1800 }
1801
1802 static int
1803 syncprov_op_extended( Operation *op, SlapReply *rs )
1804 {
1805         if ( exop_is_write( op ))
1806                 return syncprov_op_mod( op, rs );
1807
1808         return SLAP_CB_CONTINUE;
1809 }
1810
1811 typedef struct searchstate {
1812         slap_overinst *ss_on;
1813         syncops *ss_so;
1814         BerVarray ss_ctxcsn;
1815         int *ss_sids;
1816         int ss_numcsns;
1817         int ss_present;
1818 } searchstate;
1819
1820 static int
1821 syncprov_search_cleanup( Operation *op, SlapReply *rs )
1822 {
1823         if ( rs->sr_ctrls ) {
1824                 op->o_tmpfree( rs->sr_ctrls[0], op->o_tmpmemctx );
1825                 op->o_tmpfree( rs->sr_ctrls, op->o_tmpmemctx );
1826                 rs->sr_ctrls = NULL;
1827         }
1828         return 0;
1829 }
1830
1831 typedef struct SyncOperationBuffer {
1832         Operation               sob_op;
1833         Opheader                sob_hdr;
1834         AttributeName   sob_extra;      /* not always present */
1835         /* Further data allocated here */
1836 } SyncOperationBuffer;
1837
1838 static void
1839 syncprov_detach_op( Operation *op, syncops *so, slap_overinst *on )
1840 {
1841         SyncOperationBuffer *sopbuf2;
1842         Operation *op2;
1843         int i, alen = 0;
1844         size_t size;
1845         char *ptr;
1846         GroupAssertion *g1, *g2;
1847
1848         /* count the search attrs */
1849         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1850                 alen += op->ors_attrs[i].an_name.bv_len + 1;
1851         }
1852         /* Make a new copy of the operation */
1853         size = offsetof( SyncOperationBuffer, sob_extra ) +
1854                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
1855                 op->o_req_dn.bv_len + 1 +
1856                 op->o_req_ndn.bv_len + 1 +
1857                 op->o_ndn.bv_len + 1 +
1858                 so->s_filterstr.bv_len + 1;
1859         sopbuf2 = ch_calloc( 1, size );
1860         op2 = &sopbuf2->sob_op;
1861         op2->o_hdr = &sopbuf2->sob_hdr;
1862
1863         /* Copy the fields we care about explicitly, leave the rest alone */
1864         *op2->o_hdr = *op->o_hdr;
1865         op2->o_tag = op->o_tag;
1866         op2->o_time = op->o_time;
1867         op2->o_bd = on->on_info->oi_origdb;
1868         op2->o_request = op->o_request;
1869         op2->o_private = on;
1870
1871         ptr = (char *) sopbuf2 + offsetof( SyncOperationBuffer, sob_extra );
1872         if ( i ) {
1873                 op2->ors_attrs = (AttributeName *) ptr;
1874                 ptr = (char *) &op2->ors_attrs[i+1];
1875                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1876                         op2->ors_attrs[i] = op->ors_attrs[i];
1877                         op2->ors_attrs[i].an_name.bv_val = ptr;
1878                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
1879                 }
1880                 BER_BVZERO( &op2->ors_attrs[i].an_name );
1881         }
1882
1883         op2->o_authz = op->o_authz;
1884         op2->o_ndn.bv_val = ptr;
1885         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
1886         op2->o_dn = op2->o_ndn;
1887         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
1888         op2->o_req_dn.bv_val = ptr;
1889         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
1890         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
1891         op2->o_req_ndn.bv_val = ptr;
1892         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
1893         op2->ors_filterstr.bv_val = ptr;
1894         strcpy( ptr, so->s_filterstr.bv_val );
1895         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
1896
1897         /* Skip the AND/GE clause that we stuck on in front */
1898         if ( so->s_flags & PS_FIX_FILTER ) {
1899                 op2->ors_filter = op->ors_filter->f_and->f_next;
1900                 so->s_flags ^= PS_FIX_FILTER;
1901         } else {
1902                 op2->ors_filter = op->ors_filter;
1903         }
1904         op2->ors_filter = filter_dup( op2->ors_filter, NULL );
1905         so->s_op = op2;
1906
1907         /* Copy any cached group ACLs individually */
1908         op2->o_groups = NULL;
1909         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
1910                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
1911                 *g2 = *g1;
1912                 strcpy( g2->ga_ndn, g1->ga_ndn );
1913                 g2->ga_next = op2->o_groups;
1914                 op2->o_groups = g2;
1915         }
1916         /* Don't allow any further group caching */
1917         op2->o_do_not_cache = 1;
1918
1919         /* Add op2 to conn so abandon will find us */
1920         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
1921         op->o_conn->c_n_ops_executing++;
1922         op->o_conn->c_n_ops_completed--;
1923         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
1924         so->s_flags |= PS_IS_DETACHED;
1925         ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
1926
1927         /* Prevent anyone else from trying to send a result for this op */
1928         op->o_abandon = 1;
1929 }
1930
1931 static int
1932 syncprov_search_response( Operation *op, SlapReply *rs )
1933 {
1934         searchstate *ss = op->o_callback->sc_private;
1935         slap_overinst *on = ss->ss_on;
1936         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
1937
1938         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
1939                 Attribute *a;
1940                 /* If we got a referral without a referral object, there's
1941                  * something missing that we cannot replicate. Just ignore it.
1942                  * The consumer will abort because we didn't send the expected
1943                  * control.
1944                  */
1945                 if ( !rs->sr_entry ) {
1946                         assert( rs->sr_entry != NULL );
1947                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
1948                         return SLAP_CB_CONTINUE;
1949                 }
1950                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryCSN );
1951                 if ( a == NULL && rs->sr_operational_attrs != NULL ) {
1952                         a = attr_find( rs->sr_operational_attrs, slap_schema.si_ad_entryCSN );
1953                 }
1954                 if ( a ) {
1955                         int i, sid;
1956                         sid = slap_parse_csn_sid( &a->a_nvals[0] );
1957
1958                         /* Don't send changed entries back to the originator */
1959                         if ( sid == srs->sr_state.sid && srs->sr_state.numcsns ) {
1960                                 Debug( LDAP_DEBUG_SYNC,
1961                                         "Entry %s changed by peer, ignored\n",
1962                                         rs->sr_entry->e_name.bv_val, 0, 0 );
1963                                 return LDAP_SUCCESS;
1964                         }
1965
1966                         /* If not a persistent search */
1967                         if ( !ss->ss_so ) {
1968                                 /* Make sure entry is less than the snapshot'd contextCSN */
1969                                 for ( i=0; i<ss->ss_numcsns; i++ ) {
1970                                         if ( sid == ss->ss_sids[i] && ber_bvcmp( &a->a_nvals[0],
1971                                                 &ss->ss_ctxcsn[i] ) > 0 ) {
1972                                                 Debug( LDAP_DEBUG_SYNC,
1973                                                         "Entry %s CSN %s greater than snapshot %s\n",
1974                                                         rs->sr_entry->e_name.bv_val,
1975                                                         a->a_nvals[0].bv_val,
1976                                                         ss->ss_ctxcsn[i].bv_val );
1977                                                 return LDAP_SUCCESS;
1978                                         }
1979                                 }
1980                         }
1981
1982                         /* Don't send old entries twice */
1983                         if ( srs->sr_state.ctxcsn ) {
1984                                 for ( i=0; i<srs->sr_state.numcsns; i++ ) {
1985                                         if ( sid == srs->sr_state.sids[i] &&
1986                                                 ber_bvcmp( &a->a_nvals[0],
1987                                                         &srs->sr_state.ctxcsn[i] )<= 0 ) {
1988                                                 Debug( LDAP_DEBUG_SYNC,
1989                                                         "Entry %s CSN %s older or equal to ctx %s\n",
1990                                                         rs->sr_entry->e_name.bv_val,
1991                                                         a->a_nvals[0].bv_val,
1992                                                         srs->sr_state.ctxcsn[i].bv_val );
1993                                                 return LDAP_SUCCESS;
1994                                         }
1995                                 }
1996                         }
1997                 }
1998                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1999                         op->o_tmpmemctx );
2000                 rs->sr_ctrls[1] = NULL;
2001                 rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2002                         LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
2003         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
2004                 struct berval cookie;
2005
2006                 slap_compose_sync_cookie( op, &cookie, ss->ss_ctxcsn,
2007                         srs->sr_state.rid, srs->sr_state.sid );
2008
2009                 Debug( LDAP_DEBUG_SYNC, "syncprov_search_response: cookie=%s\n", cookie.bv_val, 0, 0 );
2010
2011                 /* Is this a regular refresh? */
2012                 if ( !ss->ss_so ) {
2013                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2014                                 op->o_tmpmemctx );
2015                         rs->sr_ctrls[1] = NULL;
2016                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
2017                                 0, 1, &cookie, ss->ss_present ?  LDAP_SYNC_REFRESH_PRESENTS :
2018                                         LDAP_SYNC_REFRESH_DELETES );
2019                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2020                 } else {
2021                 /* It's RefreshAndPersist, transition to Persist phase */
2022                         syncprov_sendinfo( op, rs, ss->ss_present ?
2023                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
2024                                 &cookie, 1, NULL, 0 );
2025                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2026
2027                         /* Detach this Op from frontend control */
2028                         ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
2029
2030                         /* Turn off the refreshing flag */
2031                         ss->ss_so->s_flags ^= PS_IS_REFRESHING;
2032
2033                         syncprov_detach_op( op, ss->ss_so, on );
2034
2035                         /* If there are queued responses, fire them off */
2036                         if ( ss->ss_so->s_res )
2037                                 syncprov_qstart( ss->ss_so );
2038                         ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
2039
2040                         return LDAP_SUCCESS;
2041                 }
2042         }
2043
2044         return SLAP_CB_CONTINUE;
2045 }
2046
2047 static int
2048 syncprov_op_search( Operation *op, SlapReply *rs )
2049 {
2050         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2051         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2052         slap_callback   *cb;
2053         int gotstate = 0, nochange = 0, do_present;
2054         syncops *sop = NULL;
2055         searchstate *ss;
2056         sync_control *srs;
2057         BerVarray ctxcsn;
2058         int i, *sids, numcsns;
2059         struct berval mincsn;
2060
2061         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
2062
2063         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
2064                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
2065                 return rs->sr_err;
2066         }
2067
2068         do_present = si->si_nopres ? 0 : 1;
2069
2070         srs = op->o_controls[slap_cids.sc_LDAPsync];
2071         op->o_managedsait = SLAP_CONTROL_NONCRITICAL;
2072
2073         /* If this is a persistent search, set it up right away */
2074         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
2075                 syncops so = {0};
2076                 fbase_cookie fc;
2077                 opcookie opc;
2078                 slap_callback sc;
2079
2080                 fc.fss = &so;
2081                 fc.fbase = 0;
2082                 so.s_eid = NOID;
2083                 so.s_op = op;
2084                 so.s_flags = PS_IS_REFRESHING | PS_FIND_BASE;
2085                 /* syncprov_findbase expects to be called as a callback... */
2086                 sc.sc_private = &opc;
2087                 opc.son = on;
2088                 ldap_pvt_thread_mutex_init( &so.s_mutex );
2089                 cb = op->o_callback;
2090                 op->o_callback = &sc;
2091                 rs->sr_err = syncprov_findbase( op, &fc );
2092                 op->o_callback = cb;
2093                 ldap_pvt_thread_mutex_destroy( &so.s_mutex );
2094
2095                 if ( rs->sr_err != LDAP_SUCCESS ) {
2096                         send_ldap_result( op, rs );
2097                         return rs->sr_err;
2098                 }
2099                 sop = ch_malloc( sizeof( syncops ));
2100                 *sop = so;
2101                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
2102                 sop->s_rid = srs->sr_state.rid;
2103                 sop->s_sid = srs->sr_state.sid;
2104                 sop->s_inuse = 1;
2105
2106                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2107                 sop->s_next = si->si_ops;
2108                 si->si_ops = sop;
2109                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2110         }
2111
2112         /* snapshot the ctxcsn */
2113         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2114         numcsns = si->si_numcsns;
2115         if ( numcsns ) {
2116                 ber_bvarray_dup_x( &ctxcsn, si->si_ctxcsn, op->o_tmpmemctx );
2117                 sids = op->o_tmpalloc( numcsns * sizeof(int), op->o_tmpmemctx );
2118                 for ( i=0; i<numcsns; i++ )
2119                         sids[i] = si->si_sids[i];
2120         } else {
2121                 ctxcsn = NULL;
2122                 sids = NULL;
2123         }
2124         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2125
2126         /* If we have a cookie, handle the PRESENT lookups */
2127         if ( srs->sr_state.ctxcsn ) {
2128                 sessionlog *sl;
2129                 int i, j;
2130
2131                 /* If we don't have any CSN of our own yet, pretend nothing
2132                  * has changed.
2133                  */
2134                 if ( !numcsns )
2135                         goto no_change;
2136
2137                 /* If there are SIDs we don't recognize in the cookie, drop them */
2138                 for (i=0; i<srs->sr_state.numcsns; ) {
2139                         for (j=0; j<numcsns; j++) {
2140                                 if ( srs->sr_state.sids[i] == sids[j] ) {
2141                                         break;
2142                                 }
2143                         }
2144                         /* not found */
2145                         if ( j == numcsns ) {
2146                                 struct berval tmp = srs->sr_state.ctxcsn[i];
2147                                 j = srs->sr_state.numcsns - 1;
2148                                 srs->sr_state.ctxcsn[i] = srs->sr_state.ctxcsn[j];
2149                                 tmp.bv_len = 0;
2150                                 srs->sr_state.ctxcsn[j] = tmp;
2151                                 srs->sr_state.numcsns = j;
2152                                 srs->sr_state.sids[i] = srs->sr_state.sids[j];
2153                                 continue;
2154                         }
2155                         i++;
2156                 }
2157
2158                 /* Find the smallest CSN */
2159                 mincsn = srs->sr_state.ctxcsn[0];
2160                 for ( i=1; i<srs->sr_state.numcsns; i++ ) {
2161                         if ( ber_bvcmp( &mincsn, &srs->sr_state.ctxcsn[i] ) > 0 )
2162                                 mincsn = srs->sr_state.ctxcsn[i];
2163                 }
2164
2165                 /* If nothing has changed, shortcut it */
2166                 if ( srs->sr_state.numcsns == numcsns ) {
2167                         int i, j, changed = 0;
2168                         for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2169                                 for ( j=0; j<numcsns; j++ ) {
2170                                         if ( srs->sr_state.sids[i] != sids[j] )
2171                                                 continue;
2172                                         if ( !bvmatch( &srs->sr_state.ctxcsn[i], &ctxcsn[j] ))
2173                                                 changed = 1;
2174                                         break;
2175                                 }
2176                                 if ( changed )
2177                                         break;
2178                         }
2179                         if ( !changed ) {
2180 no_change:              nochange = 1;
2181                                 if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
2182                                         LDAPControl     *ctrls[2];
2183
2184                                         ctrls[0] = NULL;
2185                                         ctrls[1] = NULL;
2186                                         syncprov_done_ctrl( op, rs, ctrls, 0, 0,
2187                                                 NULL, LDAP_SYNC_REFRESH_DELETES );
2188                                         rs->sr_ctrls = ctrls;
2189                                         rs->sr_err = LDAP_SUCCESS;
2190                                         send_ldap_result( op, rs );
2191                                         rs->sr_ctrls = NULL;
2192                                         return rs->sr_err;
2193                                 }
2194                                 goto shortcut;
2195                         }
2196                 }
2197                 /* Do we have a sessionlog for this search? */
2198                 sl=si->si_logs;
2199                 if ( sl ) {
2200                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
2201                         /* Are there any log entries, and is the consumer state
2202                          * present in the session log?
2203                          */
2204                         if ( sl->sl_num > 0 && ber_bvcmp( &mincsn, &sl->sl_mincsn ) >= 0 ) {
2205                                 do_present = 0;
2206                                 /* mutex is unlocked in playlog */
2207                                 syncprov_playlog( op, rs, sl, srs, ctxcsn, numcsns, sids );
2208                         } else {
2209                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
2210                         }
2211                 }
2212                 /* Is the CSN still present in the database? */
2213                 if ( syncprov_findcsn( op, FIND_CSN ) != LDAP_SUCCESS ) {
2214                         /* No, so a reload is required */
2215                         /* the 2.2 consumer doesn't send this hint */
2216                         if ( si->si_usehint && srs->sr_rhint == 0 ) {
2217                                 if ( ctxcsn )
2218                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2219                                 if ( sids )
2220                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2221                                 send_ldap_error( op, rs, LDAP_SYNC_REFRESH_REQUIRED, "sync cookie is stale" );
2222                                 return rs->sr_err;
2223                         }
2224                 } else {
2225                         gotstate = 1;
2226                         /* If changed and doing Present lookup, send Present UUIDs */
2227                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT ) !=
2228                                 LDAP_SUCCESS ) {
2229                                 if ( ctxcsn )
2230                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2231                                 if ( sids )
2232                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2233                                 send_ldap_result( op, rs );
2234                                 return rs->sr_err;
2235                         }
2236                 }
2237         }
2238
2239 shortcut:
2240         /* Append CSN range to search filter, save original filter
2241          * for persistent search evaluation
2242          */
2243         if ( sop ) {
2244                 sop->s_filterstr= op->ors_filterstr;
2245         }
2246
2247         /* If something changed, find the changes */
2248         if ( gotstate && !nochange ) {
2249                 Filter *fand, *fava;
2250
2251                 fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2252                 fand->f_choice = LDAP_FILTER_AND;
2253                 fand->f_next = NULL;
2254                 fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2255                 fand->f_and = fava;
2256                 fava->f_choice = LDAP_FILTER_GE;
2257                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
2258                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
2259 #ifdef LDAP_COMP_MATCH
2260                 fava->f_ava->aa_cf = NULL;
2261 #endif
2262                 ber_dupbv_x( &fava->f_ava->aa_value, &mincsn, op->o_tmpmemctx );
2263                 fava->f_next = op->ors_filter;
2264                 op->ors_filter = fand;
2265                 filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
2266                 if ( sop )
2267                         sop->s_flags |= PS_FIX_FILTER;
2268         }
2269
2270         /* Let our callback add needed info to returned entries */
2271         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
2272         ss = (searchstate *)(cb+1);
2273         ss->ss_on = on;
2274         ss->ss_so = sop;
2275         ss->ss_present = do_present;
2276         ss->ss_ctxcsn = ctxcsn;
2277         ss->ss_numcsns = numcsns;
2278         ss->ss_sids = sids;
2279         cb->sc_response = syncprov_search_response;
2280         cb->sc_cleanup = syncprov_search_cleanup;
2281         cb->sc_private = ss;
2282         cb->sc_next = op->o_callback;
2283         op->o_callback = cb;
2284
2285         /* If this is a persistent search and no changes were reported during
2286          * the refresh phase, just invoke the response callback to transition
2287          * us into persist phase
2288          */
2289         if ( nochange ) {
2290                 rs->sr_err = LDAP_SUCCESS;
2291                 rs->sr_nentries = 0;
2292                 send_ldap_result( op, rs );
2293                 return rs->sr_err;
2294         }
2295         return SLAP_CB_CONTINUE;
2296 }
2297
2298 static int
2299 syncprov_operational(
2300         Operation *op,
2301         SlapReply *rs )
2302 {
2303         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2304         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2305
2306         if ( rs->sr_entry &&
2307                 dn_match( &rs->sr_entry->e_nname, op->o_bd->be_nsuffix )) {
2308
2309                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
2310                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
2311                         Attribute *a, **ap = NULL;
2312
2313                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
2314                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
2315                                         break;
2316                         }
2317
2318                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2319                         if ( si->si_ctxcsn ) {
2320                                 if ( !a ) {
2321                                         for ( ap = &rs->sr_operational_attrs; *ap;
2322                                                 ap=&(*ap)->a_next );
2323
2324                                         a = attr_alloc( slap_schema.si_ad_contextCSN );
2325                                         *ap = a;
2326                                 }
2327
2328                                 if ( !ap ) {
2329                                         if ( !rs->sr_flags & REP_ENTRY_MODIFIABLE ) {
2330                                                 rs->sr_entry = entry_dup( rs->sr_entry );
2331                                                 rs->sr_flags |=
2332                                                         REP_ENTRY_MODIFIABLE|REP_ENTRY_MUSTBEFREED;
2333                                                 a = attr_find( rs->sr_entry->e_attrs,
2334                                                         slap_schema.si_ad_contextCSN );
2335                                         }
2336                                         if ( a->a_nvals != a->a_vals ) {
2337                                                 ber_bvarray_free( a->a_nvals );
2338                                         }
2339                                         a->a_nvals = NULL;
2340                                         ber_bvarray_free( a->a_vals );
2341                                         a->a_vals = NULL;
2342                                         a->a_numvals = 0;
2343                                 }
2344                                 attr_valadd( a, si->si_ctxcsn, si->si_ctxcsn, si->si_numcsns );
2345                         }
2346                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2347                 }
2348         }
2349         return SLAP_CB_CONTINUE;
2350 }
2351
2352 enum {
2353         SP_CHKPT = 1,
2354         SP_SESSL,
2355         SP_NOPRES,
2356         SP_USEHINT
2357 };
2358
2359 static ConfigDriver sp_cf_gen;
2360
2361 static ConfigTable spcfg[] = {
2362         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2363                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2364                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2365                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2366         { "syncprov-sessionlog", "ops", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2367                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2368                         "DESC 'Session log size in ops' "
2369                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2370         { "syncprov-nopresent", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_NOPRES,
2371                 sp_cf_gen, "( OLcfgOvAt:1.3 NAME 'olcSpNoPresent' "
2372                         "DESC 'Omit Present phase processing' "
2373                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2374         { "syncprov-reloadhint", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_USEHINT,
2375                 sp_cf_gen, "( OLcfgOvAt:1.4 NAME 'olcSpReloadHint' "
2376                         "DESC 'Observe Reload Hint in Request control' "
2377                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2378         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2379 };
2380
2381 static ConfigOCs spocs[] = {
2382         { "( OLcfgOvOc:1.1 "
2383                 "NAME 'olcSyncProvConfig' "
2384                 "DESC 'SyncRepl Provider configuration' "
2385                 "SUP olcOverlayConfig "
2386                 "MAY ( olcSpCheckpoint $ olcSpSessionlog $ olcSpNoPresent ) )",
2387                         Cft_Overlay, spcfg },
2388         { NULL, 0, NULL }
2389 };
2390
2391 static int
2392 sp_cf_gen(ConfigArgs *c)
2393 {
2394         slap_overinst           *on = (slap_overinst *)c->bi;
2395         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2396         int rc = 0;
2397
2398         if ( c->op == SLAP_CONFIG_EMIT ) {
2399                 switch ( c->type ) {
2400                 case SP_CHKPT:
2401                         if ( si->si_chkops || si->si_chktime ) {
2402                                 struct berval bv;
2403                                 bv.bv_len = sprintf( c->cr_msg, "%d %d",
2404                                         si->si_chkops, si->si_chktime );
2405                                 bv.bv_val = c->cr_msg;
2406                                 value_add_one( &c->rvalue_vals, &bv );
2407                         } else {
2408                                 rc = 1;
2409                         }
2410                         break;
2411                 case SP_SESSL:
2412                         if ( si->si_logs ) {
2413                                 c->value_int = si->si_logs->sl_size;
2414                         } else {
2415                                 rc = 1;
2416                         }
2417                         break;
2418                 case SP_NOPRES:
2419                         if ( si->si_nopres ) {
2420                                 c->value_int = 1;
2421                         } else {
2422                                 rc = 1;
2423                         }
2424                         break;
2425                 case SP_USEHINT:
2426                         if ( si->si_usehint ) {
2427                                 c->value_int = 1;
2428                         } else {
2429                                 rc = 1;
2430                         }
2431                         break;
2432                 }
2433                 return rc;
2434         } else if ( c->op == LDAP_MOD_DELETE ) {
2435                 switch ( c->type ) {
2436                 case SP_CHKPT:
2437                         si->si_chkops = 0;
2438                         si->si_chktime = 0;
2439                         break;
2440                 case SP_SESSL:
2441                         if ( si->si_logs )
2442                                 si->si_logs->sl_size = 0;
2443                         else
2444                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2445                         break;
2446                 case SP_NOPRES:
2447                         if ( si->si_nopres )
2448                                 si->si_nopres = 0;
2449                         else
2450                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2451                         break;
2452                 case SP_USEHINT:
2453                         if ( si->si_usehint )
2454                                 si->si_usehint = 0;
2455                         else
2456                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2457                         break;
2458                 }
2459                 return rc;
2460         }
2461         switch ( c->type ) {
2462         case SP_CHKPT:
2463                 if ( lutil_atoi( &si->si_chkops, c->argv[1] ) != 0 ) {
2464                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint ops # \"%s\"",
2465                                 c->argv[0], c->argv[1] );
2466                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2467                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2468                         return ARG_BAD_CONF;
2469                 }
2470                 if ( si->si_chkops <= 0 ) {
2471                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint ops # \"%d\"",
2472                                 c->argv[0], si->si_chkops );
2473                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2474                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2475                         return ARG_BAD_CONF;
2476                 }
2477                 if ( lutil_atoi( &si->si_chktime, c->argv[2] ) != 0 ) {
2478                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint time \"%s\"",
2479                                 c->argv[0], c->argv[1] );
2480                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2481                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2482                         return ARG_BAD_CONF;
2483                 }
2484                 if ( si->si_chktime <= 0 ) {
2485                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint time \"%d\"",
2486                                 c->argv[0], si->si_chkops );
2487                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2488                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2489                         return ARG_BAD_CONF;
2490                 }
2491                 si->si_chktime *= 60;
2492                 break;
2493         case SP_SESSL: {
2494                 sessionlog *sl;
2495                 int size = c->value_int;
2496
2497                 if ( size < 0 ) {
2498                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s size %d is negative",
2499                                 c->argv[0], size );
2500                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2501                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2502                         return ARG_BAD_CONF;
2503                 }
2504                 sl = si->si_logs;
2505                 if ( !sl ) {
2506                         sl = ch_malloc( sizeof( sessionlog ) + LDAP_LUTIL_CSNSTR_BUFSIZE );
2507                         sl->sl_mincsn.bv_val = (char *)(sl+1);
2508                         sl->sl_mincsn.bv_len = 0;
2509                         sl->sl_num = 0;
2510                         sl->sl_head = sl->sl_tail = NULL;
2511                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
2512                         si->si_logs = sl;
2513                 }
2514                 sl->sl_size = size;
2515                 }
2516                 break;
2517         case SP_NOPRES:
2518                 si->si_nopres = c->value_int;
2519                 break;
2520         case SP_USEHINT:
2521                 si->si_usehint = c->value_int;
2522                 break;
2523         }
2524         return rc;
2525 }
2526
2527 /* ITS#3456 we cannot run this search on the main thread, must use a
2528  * child thread in order to insure we have a big enough stack.
2529  */
2530 static void *
2531 syncprov_db_otask(
2532         void *ptr
2533 )
2534 {
2535         syncprov_findcsn( ptr, FIND_MAXCSN );
2536         return NULL;
2537 }
2538
2539 /* Read any existing contextCSN from the underlying db.
2540  * Then search for any entries newer than that. If no value exists,
2541  * just generate it. Cache whatever result.
2542  */
2543 static int
2544 syncprov_db_open(
2545         BackendDB *be,
2546         ConfigReply *cr
2547 )
2548 {
2549         slap_overinst   *on = (slap_overinst *) be->bd_info;
2550         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2551
2552         Connection conn = { 0 };
2553         OperationBuffer opbuf;
2554         Operation *op;
2555         Entry *e = NULL;
2556         Attribute *a;
2557         int rc;
2558         void *thrctx = NULL;
2559
2560         if ( !SLAP_LASTMOD( be )) {
2561                 Debug( LDAP_DEBUG_ANY,
2562                         "syncprov_db_open: invalid config, lastmod must be enabled\n", 0, 0, 0 );
2563                 return -1;
2564         }
2565
2566         if ( slapMode & SLAP_TOOL_MODE ) {
2567                 return 0;
2568         }
2569
2570         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
2571         if ( rc ) {
2572                 return rc;
2573         }
2574
2575         thrctx = ldap_pvt_thread_pool_context();
2576         connection_fake_init( &conn, &opbuf, thrctx );
2577         op = &opbuf.ob_op;
2578         op->o_bd = be;
2579         op->o_dn = be->be_rootdn;
2580         op->o_ndn = be->be_rootndn;
2581
2582         rc = overlay_entry_get_ov( op, be->be_nsuffix, NULL,
2583                 slap_schema.si_ad_contextCSN, 0, &e, on );
2584
2585         if ( e ) {
2586                 ldap_pvt_thread_t tid;
2587
2588                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
2589                 if ( a ) {
2590                         ber_bvarray_dup_x( &si->si_ctxcsn, a->a_vals, NULL );
2591                         si->si_numcsns = a->a_numvals;
2592                         si->si_sids = slap_parse_csn_sids( si->si_ctxcsn, a->a_numvals, NULL );
2593                 }
2594                 overlay_entry_release_ov( op, e, 0, on );
2595                 if ( si->si_ctxcsn ) {
2596                         op->o_req_dn = be->be_suffix[0];
2597                         op->o_req_ndn = be->be_nsuffix[0];
2598                         op->ors_scope = LDAP_SCOPE_SUBTREE;
2599                         ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
2600                         ldap_pvt_thread_join( tid, NULL );
2601                 }
2602         }
2603
2604         /* Didn't find a contextCSN, should we generate one? */
2605         if ( !si->si_ctxcsn ) {
2606                 char csnbuf[ LDAP_LUTIL_CSNSTR_BUFSIZE ];
2607                 struct berval csn;
2608
2609                 if ( SLAP_SYNC_SHADOW( op->o_bd )) {
2610                 /* If we're also a consumer, then don't generate anything.
2611                  * Wait for our provider to send it to us, or for a local
2612                  * modify if we have multimaster.
2613                  */
2614                         goto out;
2615                 }
2616                 csn.bv_val = csnbuf;
2617                 csn.bv_len = sizeof( csnbuf );
2618                 slap_get_csn( op, &csn, 0 );
2619                 value_add_one( &si->si_ctxcsn, &csn );
2620                 si->si_numcsns = 1;
2621                 si->si_sids = ch_malloc( sizeof(int) );
2622                 si->si_sids[0] = slap_serverID;
2623
2624                 /* make sure we do a checkpoint on close */
2625                 si->si_numops++;
2626         }
2627
2628 out:
2629         op->o_bd->bd_info = (BackendInfo *)on;
2630         return 0;
2631 }
2632
2633 /* Write the current contextCSN into the underlying db.
2634  */
2635 static int
2636 syncprov_db_close(
2637         BackendDB *be,
2638         ConfigReply *cr
2639 )
2640 {
2641     slap_overinst   *on = (slap_overinst *) be->bd_info;
2642     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2643
2644         if ( slapMode & SLAP_TOOL_MODE ) {
2645                 return 0;
2646         }
2647         if ( si->si_numops ) {
2648                 Connection conn = {0};
2649                 OperationBuffer opbuf;
2650                 Operation *op;
2651                 SlapReply rs = {REP_RESULT};
2652                 void *thrctx;
2653
2654                 thrctx = ldap_pvt_thread_pool_context();
2655                 connection_fake_init( &conn, &opbuf, thrctx );
2656                 op = &opbuf.ob_op;
2657                 op->o_bd = be;
2658                 op->o_dn = be->be_rootdn;
2659                 op->o_ndn = be->be_rootndn;
2660                 syncprov_checkpoint( op, &rs, on );
2661         }
2662
2663     return 0;
2664 }
2665
2666 static int
2667 syncprov_db_init(
2668         BackendDB *be,
2669         ConfigReply *cr
2670 )
2671 {
2672         slap_overinst   *on = (slap_overinst *)be->bd_info;
2673         syncprov_info_t *si;
2674
2675         if ( SLAP_ISGLOBALOVERLAY( be ) ) {
2676                 Debug( LDAP_DEBUG_ANY,
2677                         "syncprov must be instantiated within a database.\n",
2678                         0, 0, 0 );
2679                 return 1;
2680         }
2681
2682         si = ch_calloc(1, sizeof(syncprov_info_t));
2683         on->on_bi.bi_private = si;
2684         ldap_pvt_thread_rdwr_init( &si->si_csn_rwlock );
2685         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
2686         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
2687
2688         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
2689         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
2690         csn_anlist[1].an_desc = slap_schema.si_ad_entryUUID;
2691         csn_anlist[1].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2692
2693         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
2694         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2695
2696         return 0;
2697 }
2698
2699 static int
2700 syncprov_db_destroy(
2701         BackendDB *be,
2702         ConfigReply *cr
2703 )
2704 {
2705         slap_overinst   *on = (slap_overinst *)be->bd_info;
2706         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2707
2708         if ( si ) {
2709                 if ( si->si_logs ) {
2710                         slog_entry *se = si->si_logs->sl_head;
2711
2712                         while ( se ) {
2713                                 slog_entry *se_next = se->se_next;
2714                                 ch_free( se );
2715                                 se = se_next;
2716                         }
2717
2718                         ch_free( si->si_logs );
2719                 }
2720                 if ( si->si_ctxcsn )
2721                         ber_bvarray_free( si->si_ctxcsn );
2722                 if ( si->si_sids )
2723                         ch_free( si->si_sids );
2724                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
2725                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
2726                 ldap_pvt_thread_rdwr_destroy( &si->si_csn_rwlock );
2727                 ch_free( si );
2728         }
2729
2730         return 0;
2731 }
2732
2733 static int syncprov_parseCtrl (
2734         Operation *op,
2735         SlapReply *rs,
2736         LDAPControl *ctrl )
2737 {
2738         ber_tag_t tag;
2739         BerElementBuffer berbuf;
2740         BerElement *ber = (BerElement *)&berbuf;
2741         ber_int_t mode;
2742         ber_len_t len;
2743         struct berval cookie = BER_BVNULL;
2744         sync_control *sr;
2745         int rhint = 0;
2746
2747         if ( op->o_sync != SLAP_CONTROL_NONE ) {
2748                 rs->sr_text = "Sync control specified multiple times";
2749                 return LDAP_PROTOCOL_ERROR;
2750         }
2751
2752         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
2753                 rs->sr_text = "Sync control specified with pagedResults control";
2754                 return LDAP_PROTOCOL_ERROR;
2755         }
2756
2757         if ( BER_BVISNULL( &ctrl->ldctl_value ) ) {
2758                 rs->sr_text = "Sync control value is absent";
2759                 return LDAP_PROTOCOL_ERROR;
2760         }
2761
2762         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
2763                 rs->sr_text = "Sync control value is empty";
2764                 return LDAP_PROTOCOL_ERROR;
2765         }
2766
2767         /* Parse the control value
2768          *      syncRequestValue ::= SEQUENCE {
2769          *              mode   ENUMERATED {
2770          *                      -- 0 unused
2771          *                      refreshOnly             (1),
2772          *                      -- 2 reserved
2773          *                      refreshAndPersist       (3)
2774          *              },
2775          *              cookie  syncCookie OPTIONAL
2776          *      }
2777          */
2778
2779         ber_init2( ber, &ctrl->ldctl_value, 0 );
2780
2781         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
2782                 rs->sr_text = "Sync control : mode decoding error";
2783                 return LDAP_PROTOCOL_ERROR;
2784         }
2785
2786         switch( mode ) {
2787         case LDAP_SYNC_REFRESH_ONLY:
2788                 mode = SLAP_SYNC_REFRESH;
2789                 break;
2790         case LDAP_SYNC_REFRESH_AND_PERSIST:
2791                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
2792                 break;
2793         default:
2794                 rs->sr_text = "Sync control : unknown update mode";
2795                 return LDAP_PROTOCOL_ERROR;
2796         }
2797
2798         tag = ber_peek_tag( ber, &len );
2799
2800         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
2801                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
2802                         rs->sr_text = "Sync control : cookie decoding error";
2803                         return LDAP_PROTOCOL_ERROR;
2804                 }
2805                 tag = ber_peek_tag( ber, &len );
2806         }
2807         if ( tag == LDAP_TAG_RELOAD_HINT ) {
2808                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
2809                         rs->sr_text = "Sync control : rhint decoding error";
2810                         return LDAP_PROTOCOL_ERROR;
2811                 }
2812         }
2813         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
2814                         rs->sr_text = "Sync control : decoding error";
2815                         return LDAP_PROTOCOL_ERROR;
2816         }
2817         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
2818         sr->sr_rhint = rhint;
2819         if (!BER_BVISNULL(&cookie)) {
2820                 ber_dupbv_x( &sr->sr_state.octet_str, &cookie, op->o_tmpmemctx );
2821                 if ( slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx ) ||
2822                         sr->sr_state.rid == -1 ) {
2823                         rs->sr_text = "Sync control : cookie parsing error";
2824                         return LDAP_PROTOCOL_ERROR;
2825                 }
2826         }
2827
2828         op->o_controls[slap_cids.sc_LDAPsync] = sr;
2829
2830         op->o_sync = ctrl->ldctl_iscritical
2831                 ? SLAP_CONTROL_CRITICAL
2832                 : SLAP_CONTROL_NONCRITICAL;
2833
2834         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
2835
2836         return LDAP_SUCCESS;
2837 }
2838
2839 /* This overlay is set up for dynamic loading via moduleload. For static
2840  * configuration, you'll need to arrange for the slap_overinst to be
2841  * initialized and registered by some other function inside slapd.
2842  */
2843
2844 static slap_overinst            syncprov;
2845
2846 int
2847 syncprov_initialize()
2848 {
2849         int rc;
2850
2851         rc = register_supported_control( LDAP_CONTROL_SYNC,
2852                 SLAP_CTRL_SEARCH, NULL,
2853                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
2854         if ( rc != LDAP_SUCCESS ) {
2855                 Debug( LDAP_DEBUG_ANY,
2856                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
2857                 return rc;
2858         }
2859
2860         syncprov.on_bi.bi_type = "syncprov";
2861         syncprov.on_bi.bi_db_init = syncprov_db_init;
2862         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
2863         syncprov.on_bi.bi_db_open = syncprov_db_open;
2864         syncprov.on_bi.bi_db_close = syncprov_db_close;
2865
2866         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
2867         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
2868
2869         syncprov.on_bi.bi_op_add = syncprov_op_mod;
2870         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
2871         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
2872         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
2873         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
2874         syncprov.on_bi.bi_op_search = syncprov_op_search;
2875         syncprov.on_bi.bi_extended = syncprov_op_extended;
2876         syncprov.on_bi.bi_operational = syncprov_operational;
2877
2878         syncprov.on_bi.bi_cf_ocs = spocs;
2879
2880         generic_filter.f_desc = slap_schema.si_ad_objectClass;
2881
2882         rc = config_register_schema( spcfg, spocs );
2883         if ( rc ) return rc;
2884
2885         return overlay_register( &syncprov );
2886 }
2887
2888 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
2889 int
2890 init_module( int argc, char *argv[] )
2891 {
2892         return syncprov_initialize();
2893 }
2894 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
2895
2896 #endif /* defined(SLAPD_OVER_SYNCPROV) */