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