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 2004-2008 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, struct re_s *rtask )
 841 {
 842         syncops *so = rtask->arg;
 843         slap_overinst *on = so->s_op->o_private;
 844         syncres *sr;
 845         Entry *e;
 846         opcookie opc;
 847         int rc = 0;
 848
 849         opc.son = on;
 850
 851         for (;;) {
 852                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 853                 sr = so->s_res;
 854                 if ( sr )
 855                         so->s_res = sr->s_next;
 856                 if ( !so->s_res )
 857                         so->s_restail = NULL;
 858                 /* Exit loop with mutex held */
 859                 if ( !sr || so->s_op->o_abandon )
 860                         break;
 861                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 862
 863                 opc.sdn = sr->s_dn;
 864                 opc.sndn = sr->s_ndn;
 865                 opc.suuid = sr->s_uuid;
 866                 opc.sctxcsn = sr->s_csn;
 867                 opc.sreference = sr->s_isreference;
 868                 e = NULL;
 869
 870                 if ( sr->s_mode != LDAP_SYNC_DELETE ) {
 871                         rc = overlay_entry_get_ov( op, &opc.sndn, NULL, NULL, 0, &e, on );
 872                         if ( rc ) {
 873                                 Debug( LDAP_DEBUG_SYNC, "syncprov_qplay: failed to get %s, "
 874                                         "error (%d), ignoring...\n", opc.sndn.bv_val, rc, 0 );
 875                                 ch_free( sr );
 876                                 rc = 0;
 877                                 continue;
 878                         }
 879                 }
 880                 rc = syncprov_sendresp( op, &opc, so, &e, sr->s_mode );
 881
 882                 if ( e ) {
 883                         overlay_entry_release_ov( op, e, 0, on );
 884                 }
 885
 886                 ch_free( sr );
 887
 888                 if ( rc ) {
 889                         /* Exit loop with mutex held */
 890                         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 891                         break;
 892                 }
 893         }
 894
 895         /* wait until we get explicitly scheduled again */
 896         ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
 897         ldap_pvt_runqueue_stoptask( &slapd_rq, rtask );
 898         if ( rc == 0 ) {
 899                 ldap_pvt_runqueue_resched( &slapd_rq, rtask, 1 );
 900         } else {
 901                 /* bail out on any error */
 902                 ldap_pvt_runqueue_remove( &slapd_rq, rtask );
 903         }
 904         ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
 905         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 906         return rc;
 907 }
 908
 909 /* runqueue task for playing back queued responses */
 910 static void *
 911 syncprov_qtask( void *ctx, void *arg )
 912 {
 913         struct re_s *rtask = arg;
 914         syncops *so = rtask->arg;
 915         OperationBuffer opbuf;
 916         Operation *op;
 917         BackendDB be;
 918         int rc;
 919
 920         op = &opbuf.ob_op;
 921         *op = *so->s_op;
 922         op->o_hdr = &opbuf.ob_hdr;
 923         op->o_controls = opbuf.ob_controls;
 924         memset( op->o_controls, 0, sizeof(opbuf.ob_controls) );
 925
 926         *op->o_hdr = *so->s_op->o_hdr;
 927
 928         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx, 1);
 929         op->o_tmpmfuncs = &slap_sl_mfuncs;
 930         op->o_threadctx = ctx;
 931
 932         /* syncprov_qplay expects a fake db */
 933         be = *so->s_op->o_bd;
 934         be.be_flags |= SLAP_DBFLAG_OVERLAY;
 935         op->o_bd = &be;
 936         op->o_private = NULL;
 937         op->o_callback = NULL;
 938
 939         rc = syncprov_qplay( op, rtask );
 940
 941         /* decrement use count... */
 942         syncprov_free_syncop( so );
 943
 944 #if 0   /* FIXME: connection_close isn't exported from slapd.
 945                  * should it be?
 946                  */
 947         if ( rc ) {
 948                 ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
 949                 if ( connection_state_closing( op->o_conn )) {
 950                         connection_close( op->o_conn );
 951                 }
 952                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
 953         }
 954 #endif
 955         return NULL;
 956 }
 957
 958 /* Start the task to play back queued psearch responses */
 959 static void
 960 syncprov_qstart( syncops *so )
 961 {
 962         int wake=0;
 963         ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
 964         if ( !so->s_qtask ) {
 965                 so->s_qtask = ldap_pvt_runqueue_insert( &slapd_rq, RUNQ_INTERVAL,
 966                         syncprov_qtask, so, "syncprov_qtask",
 967                         so->s_op->o_conn->c_peer_name.bv_val );
 968                 ++so->s_inuse;
 969                 wake = 1;
 970         } else {
 971                 if (!ldap_pvt_runqueue_isrunning( &slapd_rq, so->s_qtask ) &&
 972                         !so->s_qtask->next_sched.tv_sec ) {
 973                         so->s_qtask->interval.tv_sec = 0;
 974                         ldap_pvt_runqueue_resched( &slapd_rq, so->s_qtask, 0 );
 975                         so->s_qtask->interval.tv_sec = RUNQ_INTERVAL;
 976                         ++so->s_inuse;
 977                         wake = 1;
 978                 }
 979         }
 980         ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
 981         if ( wake )
 982                 slap_wake_listener();
 983 }
 984
 985 /* Queue a persistent search response */
 986 static int
 987 syncprov_qresp( opcookie *opc, syncops *so, int mode )
 988 {
 989         syncres *sr;
 990         int sid, srsize;
 991
 992         /* Don't send changes back to their originator */
 993         sid = slap_parse_csn_sid( &opc->sctxcsn );
 994         if ( sid >= 0 && sid == so->s_sid )
 995                 return LDAP_SUCCESS;
 996
 997         srsize = sizeof(syncres) + opc->suuid.bv_len + 1 +
 998                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1;
 999         if ( opc->sctxcsn.bv_len )
1000                 srsize += opc->sctxcsn.bv_len + 1;
1001         sr = ch_malloc( srsize );
1002         sr->s_next = NULL;
1003         sr->s_dn.bv_val = (char *)(sr + 1);
1004         sr->s_dn.bv_len = opc->sdn.bv_len;
1005         sr->s_mode = mode;
1006         sr->s_isreference = opc->sreference;
1007         sr->s_ndn.bv_val = lutil_strcopy( sr->s_dn.bv_val,
1008                  opc->sdn.bv_val ) + 1;
1009         sr->s_ndn.bv_len = opc->sndn.bv_len;
1010         sr->s_uuid.bv_val = lutil_strcopy( sr->s_ndn.bv_val,
1011                  opc->sndn.bv_val ) + 1;
1012         sr->s_uuid.bv_len = opc->suuid.bv_len;
1013         AC_MEMCPY( sr->s_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1014         if ( opc->sctxcsn.bv_len ) {
1015                 sr->s_csn.bv_val = sr->s_uuid.bv_val + sr->s_uuid.bv_len + 1;
1016                 strcpy( sr->s_csn.bv_val, opc->sctxcsn.bv_val );
1017         } else {
1018                 sr->s_csn.bv_val = NULL;
1019         }
1020         sr->s_csn.bv_len = opc->sctxcsn.bv_len;
1021
1022         ldap_pvt_thread_mutex_lock( &so->s_mutex );
1023         if ( !so->s_res ) {
1024                 so->s_res = sr;
1025         } else {
1026                 so->s_restail->s_next = sr;
1027         }
1028         so->s_restail = sr;
1029
1030         /* If the base of the psearch was modified, check it next time round */
1031         if ( so->s_flags & PS_WROTE_BASE ) {
1032                 so->s_flags ^= PS_WROTE_BASE;
1033                 so->s_flags |= PS_FIND_BASE;
1034         }
1035         if ( so->s_flags & PS_IS_DETACHED ) {
1036                 syncprov_qstart( so );
1037         }
1038         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
1039         return LDAP_SUCCESS;
1040 }
1041
1042 static int
1043 syncprov_drop_psearch( syncops *so, int lock )
1044 {
1045         if ( so->s_flags & PS_IS_DETACHED ) {
1046                 if ( lock )
1047                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
1048                 so->s_op->o_conn->c_n_ops_executing--;
1049                 so->s_op->o_conn->c_n_ops_completed++;
1050                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, Operation,
1051                         o_next );
1052                 if ( lock )
1053                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
1054         }
1055         syncprov_free_syncop( so );
1056
1057         return 0;
1058 }
1059
1060 static int
1061 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
1062 {
1063         slap_callback *sc = op->o_callback;
1064         op->o_callback = sc->sc_next;
1065         syncprov_drop_psearch( op->o_callback->sc_private, 0 );
1066         op->o_tmpfree( sc, op->o_tmpmemctx );
1067         return 0;
1068 }
1069
1070 static int
1071 syncprov_op_abandon( Operation *op, SlapReply *rs )
1072 {
1073         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1074         syncprov_info_t         *si = on->on_bi.bi_private;
1075         syncops *so, *soprev;
1076
1077         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1078         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
1079                 soprev=so, so=so->s_next ) {
1080                 if ( so->s_op->o_connid == op->o_connid &&
1081                         so->s_op->o_msgid == op->orn_msgid ) {
1082                                 so->s_op->o_abandon = 1;
1083                                 soprev->s_next = so->s_next;
1084                                 break;
1085                 }
1086         }
1087         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1088         if ( so ) {
1089                 /* Is this really a Cancel exop? */
1090                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
1091                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
1092                         rs->sr_err = LDAP_CANCELLED;
1093                         send_ldap_result( so->s_op, rs );
1094                         if ( so->s_flags & PS_IS_DETACHED ) {
1095                                 slap_callback *cb;
1096                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
1097                                 cb->sc_cleanup = syncprov_ab_cleanup;
1098                                 cb->sc_next = op->o_callback;
1099                                 cb->sc_private = so;
1100                                 return SLAP_CB_CONTINUE;
1101                         }
1102                 }
1103                 syncprov_drop_psearch( so, 0 );
1104         }
1105         return SLAP_CB_CONTINUE;
1106 }
1107
1108 /* Find which persistent searches are affected by this operation */
1109 static void
1110 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
1111 {
1112         slap_overinst *on = opc->son;
1113         syncprov_info_t         *si = on->on_bi.bi_private;
1114
1115         fbase_cookie fc;
1116         syncops *ss, *sprev, *snext;
1117         Entry *e = NULL;
1118         Attribute *a;
1119         int rc;
1120         struct berval newdn;
1121         int freefdn = 0;
1122         BackendDB *b0 = op->o_bd, db;
1123
1124         fc.fdn = &op->o_req_ndn;
1125         /* compute new DN */
1126         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1127                 struct berval pdn;
1128                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
1129                 else dnParent( fc.fdn, &pdn );
1130                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
1131                 fc.fdn = &newdn;
1132                 freefdn = 1;
1133         }
1134         if ( op->o_tag != LDAP_REQ_ADD ) {
1135                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1136                         db = *op->o_bd;
1137                         op->o_bd = &db;
1138                 }
1139                 rc = overlay_entry_get_ov( op, fc.fdn, NULL, NULL, 0, &e, on );
1140                 /* If we're sending responses now, make a copy and unlock the DB */
1141                 if ( e && !saveit ) {
1142                         Entry *e2 = entry_dup( e );
1143                         overlay_entry_release_ov( op, e, 0, on );
1144                         e = e2;
1145                 }
1146                 if ( rc ) {
1147                         op->o_bd = b0;
1148                         return;
1149                 }
1150         } else {
1151                 e = op->ora_e;
1152         }
1153
1154         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1155                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1156                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1157                 opc->sreference = is_entry_referral( e );
1158                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1159                 if ( a )
1160                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1161         } else if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1162                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1163                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1164                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1165                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1166         }
1167
1168         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1169         for (ss = si->si_ops, sprev = (syncops *)&si->si_ops; ss;
1170                 sprev = ss, ss=snext)
1171         {
1172                 syncmatches *sm;
1173                 int found = 0;
1174
1175                 snext = ss->s_next;
1176                 /* validate base */
1177                 fc.fss = ss;
1178                 fc.fbase = 0;
1179                 fc.fscope = 0;
1180
1181                 /* If the base of the search is missing, signal a refresh */
1182                 rc = syncprov_findbase( op, &fc );
1183                 if ( rc != LDAP_SUCCESS ) {
1184                         SlapReply rs = {REP_RESULT};
1185                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1186                                 "search base has changed" );
1187                         sprev->s_next = snext;
1188                         syncprov_drop_psearch( ss, 1 );
1189                         ss = sprev;
1190                         continue;
1191                 }
1192
1193
1194                 /* If we're sending results now, look for this op in old matches */
1195                 if ( !saveit ) {
1196                         syncmatches *old;
1197
1198                         /* Did we modify the search base? */
1199                         if ( dn_match( &op->o_req_ndn, &ss->s_base )) {
1200                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1201                                 ss->s_flags |= PS_WROTE_BASE;
1202                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1203                         }
1204
1205                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1206                                 old=sm, sm=sm->sm_next ) {
1207                                 if ( sm->sm_op == ss ) {
1208                                         found = 1;
1209                                         old->sm_next = sm->sm_next;
1210                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1211                                         break;
1212                                 }
1213                         }
1214                 }
1215
1216                 /* check if current o_req_dn is in scope and matches filter */
1217                 if ( fc.fscope && test_filter( op, e, ss->s_op->ors_filter ) ==
1218                         LDAP_COMPARE_TRUE ) {
1219                         if ( saveit ) {
1220                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1221                                 sm->sm_next = opc->smatches;
1222                                 sm->sm_op = ss;
1223                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1224                                 ++ss->s_inuse;
1225                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1226                                 opc->smatches = sm;
1227                         } else {
1228                                 /* if found send UPDATE else send ADD */
1229                                 syncprov_qresp( opc, ss,
1230                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD );
1231                         }
1232                 } else if ( !saveit && found ) {
1233                         /* send DELETE */
1234                         syncprov_qresp( opc, ss, LDAP_SYNC_DELETE );
1235                 }
1236         }
1237         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1238
1239         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1240                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1241                         op->o_bd = &db;
1242                 }
1243                 overlay_entry_release_ov( op, e, 0, on );
1244                 op->o_bd = b0;
1245         }
1246         if ( freefdn ) {
1247                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1248         }
1249         op->o_bd = b0;
1250 }
1251
1252 static int
1253 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1254 {
1255         slap_callback *cb = op->o_callback;
1256         opcookie *opc = cb->sc_private;
1257         slap_overinst *on = opc->son;
1258         syncprov_info_t         *si = on->on_bi.bi_private;
1259         syncmatches *sm, *snext;
1260         modtarget *mt, mtdummy;
1261
1262         for (sm = opc->smatches; sm; sm=snext) {
1263                 snext = sm->sm_next;
1264                 syncprov_free_syncop( sm->sm_op );
1265                 op->o_tmpfree( sm, op->o_tmpmemctx );
1266         }
1267
1268         /* Remove op from lock table */
1269         mtdummy.mt_op = op;
1270         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1271         mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1272         if ( mt ) {
1273                 modinst *mi = mt->mt_mods;
1274
1275                 /* If there are more, promote the next one */
1276                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1277                 if ( mi->mi_next ) {
1278                         mt->mt_mods = mi->mi_next;
1279                         mt->mt_op = mt->mt_mods->mi_op;
1280                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1281                 } else {
1282                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1283                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1284                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1285                         ch_free( mt );
1286                 }
1287         }
1288         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1289         if ( !BER_BVISNULL( &opc->suuid ))
1290                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1291         if ( !BER_BVISNULL( &opc->sndn ))
1292                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1293         if ( !BER_BVISNULL( &opc->sdn ))
1294                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1295         op->o_callback = cb->sc_next;
1296         op->o_tmpfree(cb, op->o_tmpmemctx);
1297
1298         return 0;
1299 }
1300
1301 static void
1302 syncprov_checkpoint( Operation *op, SlapReply *rs, slap_overinst *on )
1303 {
1304         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
1305         Modifications mod;
1306         Operation opm;
1307         SlapReply rsm = { 0 };
1308         slap_callback cb = {0};
1309
1310         mod.sml_numvals = si->si_numcsns;
1311         mod.sml_values = si->si_ctxcsn;
1312         mod.sml_nvalues = NULL;
1313         mod.sml_desc = slap_schema.si_ad_contextCSN;
1314         mod.sml_op = LDAP_MOD_REPLACE;
1315         mod.sml_flags = 0;
1316         mod.sml_next = NULL;
1317
1318         cb.sc_response = slap_null_cb;
1319         opm = *op;
1320         opm.o_tag = LDAP_REQ_MODIFY;
1321         opm.o_callback = &cb;
1322         opm.orm_modlist = &mod;
1323         opm.orm_no_opattrs = 1;
1324         opm.o_req_dn = op->o_bd->be_suffix[0];
1325         opm.o_req_ndn = op->o_bd->be_nsuffix[0];
1326         opm.o_bd->bd_info = on->on_info->oi_orig;
1327         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1328         opm.o_no_schema_check = 1;
1329         opm.o_bd->be_modify( &opm, &rsm );
1330         if ( mod.sml_next != NULL ) {
1331                 slap_mods_free( mod.sml_next, 1 );
1332         }
1333         opm.orm_no_opattrs = 0;
1334 }
1335
1336 static void
1337 syncprov_add_slog( Operation *op )
1338 {
1339         opcookie *opc = op->o_callback->sc_private;
1340         slap_overinst *on = opc->son;
1341         syncprov_info_t         *si = on->on_bi.bi_private;
1342         sessionlog *sl;
1343         slog_entry *se;
1344
1345         sl = si->si_logs;
1346         {
1347                 /* Allocate a record. UUIDs are not NUL-terminated. */
1348                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1349                         op->o_csn.bv_len + 1 );
1350                 se->se_next = NULL;
1351                 se->se_tag = op->o_tag;
1352
1353                 se->se_uuid.bv_val = (char *)(&se[1]);
1354                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1355                 se->se_uuid.bv_len = opc->suuid.bv_len;
1356
1357                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1358                 AC_MEMCPY( se->se_csn.bv_val, op->o_csn.bv_val, op->o_csn.bv_len );
1359                 se->se_csn.bv_val[op->o_csn.bv_len] = '\0';
1360                 se->se_csn.bv_len = op->o_csn.bv_len;
1361                 se->se_sid = slap_parse_csn_sid( &se->se_csn );
1362
1363                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1364                 if ( sl->sl_head ) {
1365                         sl->sl_tail->se_next = se;
1366                 } else {
1367                         sl->sl_head = se;
1368                 }
1369                 sl->sl_tail = se;
1370                 sl->sl_num++;
1371                 while ( sl->sl_num > sl->sl_size ) {
1372                         se = sl->sl_head;
1373                         sl->sl_head = se->se_next;
1374                         strcpy( sl->sl_mincsn.bv_val, se->se_csn.bv_val );
1375                         sl->sl_mincsn.bv_len = se->se_csn.bv_len;
1376                         ch_free( se );
1377                         sl->sl_num--;
1378                 }
1379                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1380         }
1381 }
1382
1383 /* Just set a flag if we found the matching entry */
1384 static int
1385 playlog_cb( Operation *op, SlapReply *rs )
1386 {
1387         if ( rs->sr_type == REP_SEARCH ) {
1388                 op->o_callback->sc_private = (void *)1;
1389         }
1390         return rs->sr_err;
1391 }
1392
1393 /* enter with sl->sl_mutex locked, release before returning */
1394 static void
1395 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1396         sync_control *srs, BerVarray ctxcsn, int numcsns, int *sids )
1397 {
1398         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1399         slog_entry *se;
1400         int i, j, ndel, num, nmods, mmods;
1401         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1402         BerVarray uuids;
1403         struct berval delcsn[2];
1404
1405         if ( !sl->sl_num ) {
1406                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1407                 return;
1408         }
1409
1410         num = sl->sl_num;
1411         i = 0;
1412         nmods = 0;
1413
1414         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1415                 num * UUID_LEN, op->o_tmpmemctx );
1416         uuids[0].bv_val = (char *)(uuids + num + 1);
1417
1418         delcsn[0].bv_len = 0;
1419         delcsn[0].bv_val = cbuf;
1420         BER_BVZERO(&delcsn[1]);
1421
1422         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1423          * and everything else at the end. Do this first so we can
1424          * unlock the list mutex.
1425          */
1426         Debug( LDAP_DEBUG_SYNC, "srs csn %s\n",
1427                 srs->sr_state.ctxcsn[0].bv_val, 0, 0 );
1428         for ( se=sl->sl_head; se; se=se->se_next ) {
1429                 int k;
1430                 Debug( LDAP_DEBUG_SYNC, "log csn %s\n", se->se_csn.bv_val, 0, 0 );
1431                 ndel = 1;
1432                 for ( k=0; k<srs->sr_state.numcsns; k++ ) {
1433                         if ( se->se_sid == srs->sr_state.sids[k] ) {
1434                                 ndel = ber_bvcmp( &se->se_csn, &srs->sr_state.ctxcsn[k] );
1435                                 break;
1436                         }
1437                 }
1438                 if ( ndel <= 0 ) {
1439                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too old\n", ndel, 0, 0 );
1440                         continue;
1441                 }
1442                 ndel = 0;
1443                 for ( k=0; k<numcsns; k++ ) {
1444                         if ( se->se_sid == sids[k] ) {
1445                                 ndel = ber_bvcmp( &se->se_csn, &ctxcsn[k] );
1446                                 break;
1447                         }
1448                 }
1449                 if ( ndel > 0 ) {
1450                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too new\n", ndel, 0, 0 );
1451                         break;
1452                 }
1453                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1454                         j = i;
1455                         i++;
1456                         AC_MEMCPY( cbuf, se->se_csn.bv_val, se->se_csn.bv_len );
1457                         delcsn[0].bv_len = se->se_csn.bv_len;
1458                         delcsn[0].bv_val[delcsn[0].bv_len] = '\0';
1459                 } else {
1460                         nmods++;
1461                         j = num - nmods;
1462                 }
1463                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1464                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1465                 uuids[j].bv_len = UUID_LEN;
1466         }
1467         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1468
1469         ndel = i;
1470
1471         /* Zero out unused slots */
1472         for ( i=ndel; i < num - nmods; i++ )
1473                 uuids[i].bv_len = 0;
1474
1475         /* Mods must be validated to see if they belong in this delete set.
1476          */
1477
1478         mmods = nmods;
1479         /* Strip any duplicates */
1480         for ( i=0; i<nmods; i++ ) {
1481                 for ( j=0; j<ndel; j++ ) {
1482                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1483                                 uuids[num - 1 - i].bv_len = 0;
1484                                 mmods --;
1485                                 break;
1486                         }
1487                 }
1488                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1489                 for ( j=0; j<i; j++ ) {
1490                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1491                                 uuids[num - 1 - i].bv_len = 0;
1492                                 mmods --;
1493                                 break;
1494                         }
1495                 }
1496         }
1497
1498         if ( mmods ) {
1499                 Operation fop;
1500                 SlapReply frs = { REP_RESULT };
1501                 int rc;
1502                 Filter mf, af;
1503                 AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
1504                 slap_callback cb = {0};
1505
1506                 fop = *op;
1507
1508                 fop.o_sync_mode = 0;
1509                 fop.o_callback = &cb;
1510                 fop.ors_limit = NULL;
1511                 fop.ors_tlimit = SLAP_NO_LIMIT;
1512                 fop.ors_attrs = slap_anlist_all_attributes;
1513                 fop.ors_attrsonly = 0;
1514                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1515
1516                 af.f_choice = LDAP_FILTER_AND;
1517                 af.f_next = NULL;
1518                 af.f_and = &mf;
1519                 mf.f_choice = LDAP_FILTER_EQUALITY;
1520                 mf.f_ava = &eq;
1521                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1522                 mf.f_next = fop.ors_filter;
1523
1524                 fop.ors_filter = &af;
1525
1526                 cb.sc_response = playlog_cb;
1527                 fop.o_bd->bd_info = on->on_info->oi_orig;
1528
1529                 for ( i=ndel; i<num; i++ ) {
1530                         if ( uuids[i].bv_len == 0 ) continue;
1531
1532                         mf.f_av_value = uuids[i];
1533                         cb.sc_private = NULL;
1534                         fop.ors_slimit = 1;
1535                         frs.sr_nentries = 0;
1536                         rc = fop.o_bd->be_search( &fop, &frs );
1537
1538                         /* If entry was not found, add to delete list */
1539                         if ( !cb.sc_private ) {
1540                                 uuids[ndel++] = uuids[i];
1541                         }
1542                 }
1543                 fop.o_bd->bd_info = (BackendInfo *)on;
1544         }
1545         if ( ndel ) {
1546                 struct berval cookie;
1547
1548                 slap_compose_sync_cookie( op, &cookie, delcsn, srs->sr_state.rid,
1549                         srs->sr_state.sid );
1550
1551                 Debug( LDAP_DEBUG_SYNC, "syncprov_playlog: cookie=%s\n", cookie.bv_val, 0, 0 );
1552
1553                 uuids[ndel].bv_val = NULL;
1554                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, &cookie, 0, uuids, 1 );
1555                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1556         }
1557         op->o_tmpfree( uuids, op->o_tmpmemctx );
1558 }
1559
1560 static int
1561 syncprov_op_response( Operation *op, SlapReply *rs )
1562 {
1563         opcookie *opc = op->o_callback->sc_private;
1564         slap_overinst *on = opc->son;
1565         syncprov_info_t         *si = on->on_bi.bi_private;
1566         syncmatches *sm;
1567
1568         if ( rs->sr_err == LDAP_SUCCESS )
1569         {
1570                 struct berval maxcsn = BER_BVNULL;
1571                 char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1572                 int do_check = 0, have_psearches;
1573
1574                 /* Update our context CSN */
1575                 cbuf[0] = '\0';
1576                 ldap_pvt_thread_rdwr_wlock( &si->si_csn_rwlock );
1577                 slap_get_commit_csn( op, &maxcsn );
1578                 if ( !BER_BVISNULL( &maxcsn ) ) {
1579                         int i, sid;
1580                         strcpy( cbuf, maxcsn.bv_val );
1581                         sid = slap_parse_csn_sid( &maxcsn );
1582                         for ( i=0; i<si->si_numcsns; i++ ) {
1583                                 if ( sid == si->si_sids[i] ) {
1584                                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn[i] ) > 0 ) {
1585                                                 ber_bvreplace( &si->si_ctxcsn[i], &maxcsn );
1586                                         }
1587                                         break;
1588                                 }
1589                         }
1590                         /* It's a new SID for us */
1591                         if ( i == si->si_numcsns ) {
1592                                 value_add_one( &si->si_ctxcsn, &maxcsn );
1593                                 si->si_numcsns++;
1594                                 si->si_sids = ch_realloc( si->si_sids, si->si_numcsns *
1595                                         sizeof(int));
1596                                 si->si_sids[i] = sid;
1597                         }
1598                 }
1599
1600                 /* Don't do any processing for consumer contextCSN updates */
1601                 if ( SLAP_SYNC_SHADOW( op->o_bd ) &&
1602                         op->o_msgid == SLAP_SYNC_UPDATE_MSGID ) {
1603                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1604                         return SLAP_CB_CONTINUE;
1605                 }
1606
1607                 si->si_numops++;
1608                 if ( si->si_chkops || si->si_chktime ) {
1609                         if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1610                                 do_check = 1;
1611                                 si->si_numops = 0;
1612                         }
1613                         if ( si->si_chktime &&
1614                                 (op->o_time - si->si_chklast >= si->si_chktime )) {
1615                                 if ( si->si_chklast ) {
1616                                         do_check = 1;
1617                                         si->si_chklast = op->o_time;
1618                                 } else {
1619                                         si->si_chklast = 1;
1620                                 }
1621                         }
1622                 }
1623                 ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1624
1625                 if ( do_check ) {
1626                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1627                         syncprov_checkpoint( op, rs, on );
1628                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1629                 }
1630
1631                 opc->sctxcsn.bv_len = maxcsn.bv_len;
1632                 opc->sctxcsn.bv_val = cbuf;
1633
1634                 /* Handle any persistent searches */
1635                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1636                 have_psearches = ( si->si_ops != NULL );
1637                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1638                 if ( have_psearches ) {
1639                         switch(op->o_tag) {
1640                         case LDAP_REQ_ADD:
1641                         case LDAP_REQ_MODIFY:
1642                         case LDAP_REQ_MODRDN:
1643                         case LDAP_REQ_EXTENDED:
1644                                 syncprov_matchops( op, opc, 0 );
1645                                 break;
1646                         case LDAP_REQ_DELETE:
1647                                 /* for each match in opc->smatches:
1648                                  *   send DELETE msg
1649                                  */
1650                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1651                                         if ( sm->sm_op->s_op->o_abandon )
1652                                                 continue;
1653                                         syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_DELETE );
1654                                 }
1655                                 break;
1656                         }
1657                 }
1658
1659                 /* Add any log records */
1660                 if ( si->si_logs && op->o_tag != LDAP_REQ_ADD ) {
1661                         syncprov_add_slog( op );
1662                 }
1663
1664         }
1665         return SLAP_CB_CONTINUE;
1666 }
1667
1668 /* We don't use a subentry to store the context CSN any more.
1669  * We expose the current context CSN as an operational attribute
1670  * of the suffix entry.
1671  */
1672 static int
1673 syncprov_op_compare( Operation *op, SlapReply *rs )
1674 {
1675         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1676         syncprov_info_t         *si = on->on_bi.bi_private;
1677         int rc = SLAP_CB_CONTINUE;
1678
1679         if ( dn_match( &op->o_req_ndn, op->o_bd->be_nsuffix ) &&
1680                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1681         {
1682                 Entry e = {0};
1683                 Attribute a = {0};
1684
1685                 e.e_name = op->o_bd->be_suffix[0];
1686                 e.e_nname = op->o_bd->be_nsuffix[0];
1687                 e.e_attrs = &a;
1688
1689                 a.a_desc = slap_schema.si_ad_contextCSN;
1690
1691                 ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1692
1693                 a.a_vals = si->si_ctxcsn;
1694                 a.a_nvals = a.a_vals;
1695
1696                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1697                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1698                 if ( ! rs->sr_err ) {
1699                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1700                         goto return_results;
1701                 }
1702
1703                 if ( get_assert( op ) &&
1704                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
1705                 {
1706                         rs->sr_err = LDAP_ASSERTION_FAILED;
1707                         goto return_results;
1708                 }
1709
1710
1711                 rs->sr_err = LDAP_COMPARE_FALSE;
1712
1713                 if ( attr_valfind( &a,
1714                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
1715                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
1716                                 &op->oq_compare.rs_ava->aa_value, NULL, op->o_tmpmemctx ) == 0 )
1717                 {
1718                         rs->sr_err = LDAP_COMPARE_TRUE;
1719                 }
1720
1721 return_results:;
1722
1723                 ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1724
1725                 send_ldap_result( op, rs );
1726
1727                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
1728                         rs->sr_err = LDAP_SUCCESS;
1729                 }
1730                 rc = rs->sr_err;
1731         }
1732
1733         return rc;
1734 }
1735
1736 static int
1737 syncprov_op_mod( Operation *op, SlapReply *rs )
1738 {
1739         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1740         syncprov_info_t         *si = on->on_bi.bi_private;
1741         slap_callback *cb;
1742         opcookie *opc;
1743         int have_psearches, cbsize;
1744
1745         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1746         have_psearches = ( si->si_ops != NULL );
1747         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1748
1749         cbsize = sizeof(slap_callback) + sizeof(opcookie) +
1750                 (have_psearches ? sizeof(modinst) : 0 );
1751
1752         cb = op->o_tmpcalloc(1, cbsize, op->o_tmpmemctx);
1753         opc = (opcookie *)(cb+1);
1754         opc->son = on;
1755         cb->sc_response = syncprov_op_response;
1756         cb->sc_cleanup = syncprov_op_cleanup;
1757         cb->sc_private = opc;
1758         cb->sc_next = op->o_callback;
1759         op->o_callback = cb;
1760
1761         /* If there are active persistent searches, lock this operation.
1762          * See seqmod.c for the locking logic on its own.
1763          */
1764         if ( have_psearches ) {
1765                 modtarget *mt, mtdummy;
1766                 modinst *mi;
1767
1768                 mi = (modinst *)(opc+1);
1769                 mi->mi_op = op;
1770
1771                 /* See if we're already modifying this entry... */
1772                 mtdummy.mt_op = op;
1773                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1774                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1775                 if ( mt ) {
1776                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1777                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1778                         mt->mt_tail->mi_next = mi;
1779                         mt->mt_tail = mi;
1780                         /* wait for this op to get to head of list */
1781                         while ( mt->mt_mods != mi ) {
1782                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1783                                 ldap_pvt_thread_yield();
1784                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1785
1786                                 /* clean up if the caller is giving up */
1787                                 if ( op->o_abandon ) {
1788                                         modinst *m2;
1789                                         for ( m2 = mt->mt_mods; m2->mi_next != mi;
1790                                                 m2 = m2->mi_next );
1791                                         m2->mi_next = mi->mi_next;
1792                                         if ( mt->mt_tail == mi ) mt->mt_tail = m2;
1793                                         op->o_tmpfree( cb, op->o_tmpmemctx );
1794                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1795                                         return SLAPD_ABANDON;
1796                                 }
1797                         }
1798                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1799                 } else {
1800                         /* Record that we're modifying this entry now */
1801                         mt = ch_malloc( sizeof(modtarget) );
1802                         mt->mt_mods = mi;
1803                         mt->mt_tail = mi;
1804                         mt->mt_op = mi->mi_op;
1805                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
1806                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
1807                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1808                 }
1809         }
1810
1811         if (( have_psearches || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
1812                 syncprov_matchops( op, opc, 1 );
1813
1814         return SLAP_CB_CONTINUE;
1815 }
1816
1817 static int
1818 syncprov_op_extended( Operation *op, SlapReply *rs )
1819 {
1820         if ( exop_is_write( op ))
1821                 return syncprov_op_mod( op, rs );
1822
1823         return SLAP_CB_CONTINUE;
1824 }
1825
1826 typedef struct searchstate {
1827         slap_overinst *ss_on;
1828         syncops *ss_so;
1829         BerVarray ss_ctxcsn;
1830         int *ss_sids;
1831         int ss_numcsns;
1832 #define SS_PRESENT      0x01
1833 #define SS_CHANGED      0x02
1834         int ss_flags;
1835 } searchstate;
1836
1837 static int
1838 syncprov_search_cleanup( Operation *op, SlapReply *rs )
1839 {
1840         if ( rs->sr_ctrls ) {
1841                 op->o_tmpfree( rs->sr_ctrls[0], op->o_tmpmemctx );
1842                 op->o_tmpfree( rs->sr_ctrls, op->o_tmpmemctx );
1843                 rs->sr_ctrls = NULL;
1844         }
1845         return 0;
1846 }
1847
1848 typedef struct SyncOperationBuffer {
1849         Operation               sob_op;
1850         Opheader                sob_hdr;
1851         AttributeName   sob_extra;      /* not always present */
1852         /* Further data allocated here */
1853 } SyncOperationBuffer;
1854
1855 static void
1856 syncprov_detach_op( Operation *op, syncops *so, slap_overinst *on )
1857 {
1858         SyncOperationBuffer *sopbuf2;
1859         Operation *op2;
1860         int i, alen = 0;
1861         size_t size;
1862         char *ptr;
1863         GroupAssertion *g1, *g2;
1864
1865         /* count the search attrs */
1866         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1867                 alen += op->ors_attrs[i].an_name.bv_len + 1;
1868         }
1869         /* Make a new copy of the operation */
1870         size = offsetof( SyncOperationBuffer, sob_extra ) +
1871                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
1872                 op->o_req_dn.bv_len + 1 +
1873                 op->o_req_ndn.bv_len + 1 +
1874                 op->o_ndn.bv_len + 1 +
1875                 so->s_filterstr.bv_len + 1;
1876         sopbuf2 = ch_calloc( 1, size );
1877         op2 = &sopbuf2->sob_op;
1878         op2->o_hdr = &sopbuf2->sob_hdr;
1879
1880         /* Copy the fields we care about explicitly, leave the rest alone */
1881         *op2->o_hdr = *op->o_hdr;
1882         op2->o_tag = op->o_tag;
1883         op2->o_time = op->o_time;
1884         op2->o_bd = on->on_info->oi_origdb;
1885         op2->o_request = op->o_request;
1886         op2->o_private = on;
1887
1888         ptr = (char *) sopbuf2 + offsetof( SyncOperationBuffer, sob_extra );
1889         if ( i ) {
1890                 op2->ors_attrs = (AttributeName *) ptr;
1891                 ptr = (char *) &op2->ors_attrs[i+1];
1892                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1893                         op2->ors_attrs[i] = op->ors_attrs[i];
1894                         op2->ors_attrs[i].an_name.bv_val = ptr;
1895                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
1896                 }
1897                 BER_BVZERO( &op2->ors_attrs[i].an_name );
1898         }
1899
1900         op2->o_authz = op->o_authz;
1901         op2->o_ndn.bv_val = ptr;
1902         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
1903         op2->o_dn = op2->o_ndn;
1904         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
1905         op2->o_req_dn.bv_val = ptr;
1906         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
1907         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
1908         op2->o_req_ndn.bv_val = ptr;
1909         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
1910         op2->ors_filterstr.bv_val = ptr;
1911         strcpy( ptr, so->s_filterstr.bv_val );
1912         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
1913
1914         /* Skip the AND/GE clause that we stuck on in front */
1915         if ( so->s_flags & PS_FIX_FILTER ) {
1916                 op2->ors_filter = op->ors_filter->f_and->f_next;
1917                 so->s_flags ^= PS_FIX_FILTER;
1918         } else {
1919                 op2->ors_filter = op->ors_filter;
1920         }
1921         op2->ors_filter = filter_dup( op2->ors_filter, NULL );
1922         so->s_op = op2;
1923
1924         /* Copy any cached group ACLs individually */
1925         op2->o_groups = NULL;
1926         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
1927                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
1928                 *g2 = *g1;
1929                 strcpy( g2->ga_ndn, g1->ga_ndn );
1930                 g2->ga_next = op2->o_groups;
1931                 op2->o_groups = g2;
1932         }
1933         /* Don't allow any further group caching */
1934         op2->o_do_not_cache = 1;
1935
1936         /* Add op2 to conn so abandon will find us */
1937         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
1938         op->o_conn->c_n_ops_executing++;
1939         op->o_conn->c_n_ops_completed--;
1940         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
1941         so->s_flags |= PS_IS_DETACHED;
1942         ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
1943
1944         /* Prevent anyone else from trying to send a result for this op */
1945         op->o_abandon = 1;
1946 }
1947
1948 static int
1949 syncprov_search_response( Operation *op, SlapReply *rs )
1950 {
1951         searchstate *ss = op->o_callback->sc_private;
1952         slap_overinst *on = ss->ss_on;
1953         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
1954
1955         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
1956                 Attribute *a;
1957                 /* If we got a referral without a referral object, there's
1958                  * something missing that we cannot replicate. Just ignore it.
1959                  * The consumer will abort because we didn't send the expected
1960                  * control.
1961                  */
1962                 if ( !rs->sr_entry ) {
1963                         assert( rs->sr_entry != NULL );
1964                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
1965                         return SLAP_CB_CONTINUE;
1966                 }
1967                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryCSN );
1968                 if ( a == NULL && rs->sr_operational_attrs != NULL ) {
1969                         a = attr_find( rs->sr_operational_attrs, slap_schema.si_ad_entryCSN );
1970                 }
1971                 if ( a ) {
1972                         int i, sid;
1973                         sid = slap_parse_csn_sid( &a->a_nvals[0] );
1974
1975                         /* Don't send changed entries back to the originator */
1976                         if ( sid == srs->sr_state.sid && srs->sr_state.numcsns ) {
1977                                 Debug( LDAP_DEBUG_SYNC,
1978                                         "Entry %s changed by peer, ignored\n",
1979                                         rs->sr_entry->e_name.bv_val, 0, 0 );
1980                                 return LDAP_SUCCESS;
1981                         }
1982
1983                         /* If not a persistent search */
1984                         if ( !ss->ss_so ) {
1985                                 /* Make sure entry is less than the snapshot'd contextCSN */
1986                                 for ( i=0; i<ss->ss_numcsns; i++ ) {
1987                                         if ( sid == ss->ss_sids[i] && ber_bvcmp( &a->a_nvals[0],
1988                                                 &ss->ss_ctxcsn[i] ) > 0 ) {
1989                                                 Debug( LDAP_DEBUG_SYNC,
1990                                                         "Entry %s CSN %s greater than snapshot %s\n",
1991                                                         rs->sr_entry->e_name.bv_val,
1992                                                         a->a_nvals[0].bv_val,
1993                                                         ss->ss_ctxcsn[i].bv_val );
1994                                                 return LDAP_SUCCESS;
1995                                         }
1996                                 }
1997                         }
1998
1999                         /* Don't send old entries twice */
2000                         if ( srs->sr_state.ctxcsn ) {
2001                                 for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2002                                         if ( sid == srs->sr_state.sids[i] &&
2003                                                 ber_bvcmp( &a->a_nvals[0],
2004                                                         &srs->sr_state.ctxcsn[i] )<= 0 ) {
2005                                                 Debug( LDAP_DEBUG_SYNC,
2006                                                         "Entry %s CSN %s older or equal to ctx %s\n",
2007                                                         rs->sr_entry->e_name.bv_val,
2008                                                         a->a_nvals[0].bv_val,
2009                                                         srs->sr_state.ctxcsn[i].bv_val );
2010                                                 return LDAP_SUCCESS;
2011                                         }
2012                                 }
2013                         }
2014                 }
2015                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2016                         op->o_tmpmemctx );
2017                 rs->sr_ctrls[1] = NULL;
2018                 rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2019                         LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
2020         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
2021                 struct berval cookie;
2022
2023                 if ( ss->ss_flags & SS_CHANGED ) {
2024                         slap_compose_sync_cookie( op, &cookie, ss->ss_ctxcsn,
2025                                 srs->sr_state.rid, srs->sr_state.sid );
2026
2027                         Debug( LDAP_DEBUG_SYNC, "syncprov_search_response: cookie=%s\n", cookie.bv_val, 0, 0 );
2028                 }
2029
2030                 /* Is this a regular refresh?
2031                  * Note: refresh never gets here if there were no changes
2032                  */
2033                 if ( !ss->ss_so ) {
2034                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2035                                 op->o_tmpmemctx );
2036                         rs->sr_ctrls[1] = NULL;
2037                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
2038                                 0, 1, &cookie, ( ss->ss_flags & SS_PRESENT ) ?  LDAP_SYNC_REFRESH_PRESENTS :
2039                                         LDAP_SYNC_REFRESH_DELETES );
2040                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2041                 } else {
2042                 /* It's RefreshAndPersist, transition to Persist phase */
2043                         syncprov_sendinfo( op, rs, ( ss->ss_flags & SS_PRESENT ) ?
2044                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
2045                                 ( ss->ss_flags & SS_CHANGED ) ? &cookie : NULL,
2046                                 1, NULL, 0 );
2047                         if ( ss->ss_flags & SS_CHANGED )
2048                                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2049
2050                         /* Detach this Op from frontend control */
2051                         ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
2052
2053                         /* Turn off the refreshing flag */
2054                         ss->ss_so->s_flags ^= PS_IS_REFRESHING;
2055
2056                         syncprov_detach_op( op, ss->ss_so, on );
2057
2058                         /* If there are queued responses, fire them off */
2059                         if ( ss->ss_so->s_res )
2060                                 syncprov_qstart( ss->ss_so );
2061                         ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
2062
2063                         return LDAP_SUCCESS;
2064                 }
2065         }
2066
2067         return SLAP_CB_CONTINUE;
2068 }
2069
2070 static int
2071 syncprov_op_search( Operation *op, SlapReply *rs )
2072 {
2073         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2074         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2075         slap_callback   *cb;
2076         int gotstate = 0, changed = 0, do_present = 0;
2077         syncops *sop = NULL;
2078         searchstate *ss;
2079         sync_control *srs;
2080         BerVarray ctxcsn;
2081         int i, *sids, numcsns;
2082         struct berval mincsn;
2083
2084         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
2085
2086         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
2087                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
2088                 return rs->sr_err;
2089         }
2090
2091         srs = op->o_controls[slap_cids.sc_LDAPsync];
2092         op->o_managedsait = SLAP_CONTROL_NONCRITICAL;
2093
2094         /* If this is a persistent search, set it up right away */
2095         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
2096                 syncops so = {0};
2097                 fbase_cookie fc;
2098                 opcookie opc;
2099                 slap_callback sc;
2100
2101                 fc.fss = &so;
2102                 fc.fbase = 0;
2103                 so.s_eid = NOID;
2104                 so.s_op = op;
2105                 so.s_flags = PS_IS_REFRESHING | PS_FIND_BASE;
2106                 /* syncprov_findbase expects to be called as a callback... */
2107                 sc.sc_private = &opc;
2108                 opc.son = on;
2109                 ldap_pvt_thread_mutex_init( &so.s_mutex );
2110                 cb = op->o_callback;
2111                 op->o_callback = &sc;
2112                 rs->sr_err = syncprov_findbase( op, &fc );
2113                 op->o_callback = cb;
2114                 ldap_pvt_thread_mutex_destroy( &so.s_mutex );
2115
2116                 if ( rs->sr_err != LDAP_SUCCESS ) {
2117                         send_ldap_result( op, rs );
2118                         return rs->sr_err;
2119                 }
2120                 sop = ch_malloc( sizeof( syncops ));
2121                 *sop = so;
2122                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
2123                 sop->s_rid = srs->sr_state.rid;
2124                 sop->s_sid = srs->sr_state.sid;
2125                 sop->s_inuse = 1;
2126
2127                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2128                 sop->s_next = si->si_ops;
2129                 si->si_ops = sop;
2130                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2131         }
2132
2133         /* snapshot the ctxcsn */
2134         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2135         numcsns = si->si_numcsns;
2136         if ( numcsns ) {
2137                 ber_bvarray_dup_x( &ctxcsn, si->si_ctxcsn, op->o_tmpmemctx );
2138                 sids = op->o_tmpalloc( numcsns * sizeof(int), op->o_tmpmemctx );
2139                 for ( i=0; i<numcsns; i++ )
2140                         sids[i] = si->si_sids[i];
2141         } else {
2142                 ctxcsn = NULL;
2143                 sids = NULL;
2144         }
2145         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2146
2147         /* If we have a cookie, handle the PRESENT lookups */
2148         if ( srs->sr_state.ctxcsn ) {
2149                 sessionlog *sl;
2150                 int i, j;
2151
2152                 /* If we don't have any CSN of our own yet, pretend nothing
2153                  * has changed.
2154                  */
2155                 if ( !numcsns )
2156                         goto no_change;
2157
2158                 if ( !si->si_nopres )
2159                         do_present = SS_PRESENT;
2160
2161                 /* If there are SIDs we don't recognize in the cookie, drop them */
2162                 for (i=0; i<srs->sr_state.numcsns; ) {
2163                         for (j=0; j<numcsns; j++) {
2164                                 if ( srs->sr_state.sids[i] == sids[j] ) {
2165                                         break;
2166                                 }
2167                         }
2168                         /* not found */
2169                         if ( j == numcsns ) {
2170                                 struct berval tmp = srs->sr_state.ctxcsn[i];
2171                                 j = srs->sr_state.numcsns - 1;
2172                                 srs->sr_state.ctxcsn[i] = srs->sr_state.ctxcsn[j];
2173                                 tmp.bv_len = 0;
2174                                 srs->sr_state.ctxcsn[j] = tmp;
2175                                 srs->sr_state.numcsns = j;
2176                                 srs->sr_state.sids[i] = srs->sr_state.sids[j];
2177                                 continue;
2178                         }
2179                         i++;
2180                 }
2181
2182                 /* Find the smallest CSN */
2183                 mincsn = srs->sr_state.ctxcsn[0];
2184                 for ( i=1; i<srs->sr_state.numcsns; i++ ) {
2185                         if ( ber_bvcmp( &mincsn, &srs->sr_state.ctxcsn[i] ) > 0 )
2186                                 mincsn = srs->sr_state.ctxcsn[i];
2187                 }
2188
2189                 /* If nothing has changed, shortcut it */
2190                 if ( srs->sr_state.numcsns == numcsns ) {
2191                         int i, j;
2192                         for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2193                                 for ( j=0; j<numcsns; j++ ) {
2194                                         if ( srs->sr_state.sids[i] != sids[j] )
2195                                                 continue;
2196                                         if ( !bvmatch( &srs->sr_state.ctxcsn[i], &ctxcsn[j] ))
2197                                                 changed = SS_CHANGED;
2198                                         break;
2199                                 }
2200                                 if ( changed )
2201                                         break;
2202                         }
2203                         if ( !changed ) {
2204                                 do_present = 0;
2205 no_change:              if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
2206                                         LDAPControl     *ctrls[2];
2207
2208                                         ctrls[0] = NULL;
2209                                         ctrls[1] = NULL;
2210                                         syncprov_done_ctrl( op, rs, ctrls, 0, 0,
2211                                                 NULL, LDAP_SYNC_REFRESH_DELETES );
2212                                         rs->sr_ctrls = ctrls;
2213                                         rs->sr_err = LDAP_SUCCESS;
2214                                         send_ldap_result( op, rs );
2215                                         rs->sr_ctrls = NULL;
2216                                         return rs->sr_err;
2217                                 }
2218                                 goto shortcut;
2219                         }
2220                 }
2221                 /* Do we have a sessionlog for this search? */
2222                 sl=si->si_logs;
2223                 if ( sl ) {
2224                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
2225                         /* Are there any log entries, and is the consumer state
2226                          * present in the session log?
2227                          */
2228                         if ( sl->sl_num > 0 && ber_bvcmp( &mincsn, &sl->sl_mincsn ) >= 0 ) {
2229                                 do_present = 0;
2230                                 /* mutex is unlocked in playlog */
2231                                 syncprov_playlog( op, rs, sl, srs, ctxcsn, numcsns, sids );
2232                         } else {
2233                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
2234                         }
2235                 }
2236                 /* Is the CSN still present in the database? */
2237                 if ( syncprov_findcsn( op, FIND_CSN ) != LDAP_SUCCESS ) {
2238                         /* No, so a reload is required */
2239                         /* the 2.2 consumer doesn't send this hint */
2240                         if ( si->si_usehint && srs->sr_rhint == 0 ) {
2241                                 if ( ctxcsn )
2242                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2243                                 if ( sids )
2244                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2245                                 send_ldap_error( op, rs, LDAP_SYNC_REFRESH_REQUIRED, "sync cookie is stale" );
2246                                 return rs->sr_err;
2247                         }
2248                 } else {
2249                         gotstate = 1;
2250                         /* If changed and doing Present lookup, send Present UUIDs */
2251                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT ) !=
2252                                 LDAP_SUCCESS ) {
2253                                 if ( ctxcsn )
2254                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2255                                 if ( sids )
2256                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2257                                 send_ldap_result( op, rs );
2258                                 return rs->sr_err;
2259                         }
2260                 }
2261         } else {
2262                 /* No consumer state, assume something has changed */
2263                 changed = SS_CHANGED;
2264         }
2265
2266 shortcut:
2267         /* Append CSN range to search filter, save original filter
2268          * for persistent search evaluation
2269          */
2270         if ( sop ) {
2271                 sop->s_filterstr= op->ors_filterstr;
2272         }
2273
2274         /* If something changed, find the changes */
2275         if ( gotstate && changed ) {
2276                 Filter *fand, *fava;
2277
2278                 fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2279                 fand->f_choice = LDAP_FILTER_AND;
2280                 fand->f_next = NULL;
2281                 fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2282                 fand->f_and = fava;
2283                 fava->f_choice = LDAP_FILTER_GE;
2284                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
2285                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
2286 #ifdef LDAP_COMP_MATCH
2287                 fava->f_ava->aa_cf = NULL;
2288 #endif
2289                 ber_dupbv_x( &fava->f_ava->aa_value, &mincsn, op->o_tmpmemctx );
2290                 fava->f_next = op->ors_filter;
2291                 op->ors_filter = fand;
2292                 filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
2293                 if ( sop )
2294                         sop->s_flags |= PS_FIX_FILTER;
2295         }
2296
2297         /* Let our callback add needed info to returned entries */
2298         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
2299         ss = (searchstate *)(cb+1);
2300         ss->ss_on = on;
2301         ss->ss_so = sop;
2302         ss->ss_flags = do_present | changed;
2303         ss->ss_ctxcsn = ctxcsn;
2304         ss->ss_numcsns = numcsns;
2305         ss->ss_sids = sids;
2306         cb->sc_response = syncprov_search_response;
2307         cb->sc_cleanup = syncprov_search_cleanup;
2308         cb->sc_private = ss;
2309         cb->sc_next = op->o_callback;
2310         op->o_callback = cb;
2311
2312         /* If this is a persistent search and no changes were reported during
2313          * the refresh phase, just invoke the response callback to transition
2314          * us into persist phase
2315          */
2316         if ( !changed ) {
2317                 rs->sr_err = LDAP_SUCCESS;
2318                 rs->sr_nentries = 0;
2319                 send_ldap_result( op, rs );
2320                 return rs->sr_err;
2321         }
2322         return SLAP_CB_CONTINUE;
2323 }
2324
2325 static int
2326 syncprov_operational(
2327         Operation *op,
2328         SlapReply *rs )
2329 {
2330         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2331         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2332
2333         /* This prevents generating unnecessarily; frontend will strip
2334          * any statically stored copy.
2335          */
2336         if ( op->o_sync != SLAP_CONTROL_NONE )
2337                 return SLAP_CB_CONTINUE;
2338
2339         if ( rs->sr_entry &&
2340                 dn_match( &rs->sr_entry->e_nname, op->o_bd->be_nsuffix )) {
2341
2342                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
2343                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
2344                         Attribute *a, **ap = NULL;
2345
2346                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
2347                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
2348                                         break;
2349                         }
2350
2351                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2352                         if ( si->si_ctxcsn ) {
2353                                 if ( !a ) {
2354                                         for ( ap = &rs->sr_operational_attrs; *ap;
2355                                                 ap=&(*ap)->a_next );
2356
2357                                         a = attr_alloc( slap_schema.si_ad_contextCSN );
2358                                         *ap = a;
2359                                 }
2360
2361                                 if ( !ap ) {
2362                                         if ( !rs->sr_flags & REP_ENTRY_MODIFIABLE ) {
2363                                                 rs->sr_entry = entry_dup( rs->sr_entry );
2364                                                 rs->sr_flags |=
2365                                                         REP_ENTRY_MODIFIABLE|REP_ENTRY_MUSTBEFREED;
2366                                                 a = attr_find( rs->sr_entry->e_attrs,
2367                                                         slap_schema.si_ad_contextCSN );
2368                                         }
2369                                         if ( a->a_nvals != a->a_vals ) {
2370                                                 ber_bvarray_free( a->a_nvals );
2371                                         }
2372                                         a->a_nvals = NULL;
2373                                         ber_bvarray_free( a->a_vals );
2374                                         a->a_vals = NULL;
2375                                         a->a_numvals = 0;
2376                                 }
2377                                 attr_valadd( a, si->si_ctxcsn, si->si_ctxcsn, si->si_numcsns );
2378                         }
2379                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2380                 }
2381         }
2382         return SLAP_CB_CONTINUE;
2383 }
2384
2385 enum {
2386         SP_CHKPT = 1,
2387         SP_SESSL,
2388         SP_NOPRES,
2389         SP_USEHINT
2390 };
2391
2392 static ConfigDriver sp_cf_gen;
2393
2394 static ConfigTable spcfg[] = {
2395         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2396                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2397                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2398                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2399         { "syncprov-sessionlog", "ops", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2400                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2401                         "DESC 'Session log size in ops' "
2402                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2403         { "syncprov-nopresent", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_NOPRES,
2404                 sp_cf_gen, "( OLcfgOvAt:1.3 NAME 'olcSpNoPresent' "
2405                         "DESC 'Omit Present phase processing' "
2406                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2407         { "syncprov-reloadhint", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_USEHINT,
2408                 sp_cf_gen, "( OLcfgOvAt:1.4 NAME 'olcSpReloadHint' "
2409                         "DESC 'Observe Reload Hint in Request control' "
2410                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2411         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2412 };
2413
2414 static ConfigOCs spocs[] = {
2415         { "( OLcfgOvOc:1.1 "
2416                 "NAME 'olcSyncProvConfig' "
2417                 "DESC 'SyncRepl Provider configuration' "
2418                 "SUP olcOverlayConfig "
2419                 "MAY ( olcSpCheckpoint $ olcSpSessionlog $ olcSpNoPresent ) )",
2420                         Cft_Overlay, spcfg },
2421         { NULL, 0, NULL }
2422 };
2423
2424 static int
2425 sp_cf_gen(ConfigArgs *c)
2426 {
2427         slap_overinst           *on = (slap_overinst *)c->bi;
2428         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2429         int rc = 0;
2430
2431         if ( c->op == SLAP_CONFIG_EMIT ) {
2432                 switch ( c->type ) {
2433                 case SP_CHKPT:
2434                         if ( si->si_chkops || si->si_chktime ) {
2435                                 struct berval bv;
2436                                 bv.bv_len = snprintf( c->cr_msg, sizeof( c->cr_msg ),
2437                                         "%d %d", si->si_chkops, si->si_chktime );
2438                                 if ( bv.bv_len < 0 || bv.bv_len >= sizeof( c->cr_msg ) ) {
2439                                         rc = 1;
2440                                 } else {
2441                                         bv.bv_val = c->cr_msg;
2442                                         value_add_one( &c->rvalue_vals, &bv );
2443                                 }
2444                         } else {
2445                                 rc = 1;
2446                         }
2447                         break;
2448                 case SP_SESSL:
2449                         if ( si->si_logs ) {
2450                                 c->value_int = si->si_logs->sl_size;
2451                         } else {
2452                                 rc = 1;
2453                         }
2454                         break;
2455                 case SP_NOPRES:
2456                         if ( si->si_nopres ) {
2457                                 c->value_int = 1;
2458                         } else {
2459                                 rc = 1;
2460                         }
2461                         break;
2462                 case SP_USEHINT:
2463                         if ( si->si_usehint ) {
2464                                 c->value_int = 1;
2465                         } else {
2466                                 rc = 1;
2467                         }
2468                         break;
2469                 }
2470                 return rc;
2471         } else if ( c->op == LDAP_MOD_DELETE ) {
2472                 switch ( c->type ) {
2473                 case SP_CHKPT:
2474                         si->si_chkops = 0;
2475                         si->si_chktime = 0;
2476                         break;
2477                 case SP_SESSL:
2478                         if ( si->si_logs )
2479                                 si->si_logs->sl_size = 0;
2480                         else
2481                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2482                         break;
2483                 case SP_NOPRES:
2484                         if ( si->si_nopres )
2485                                 si->si_nopres = 0;
2486                         else
2487                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2488                         break;
2489                 case SP_USEHINT:
2490                         if ( si->si_usehint )
2491                                 si->si_usehint = 0;
2492                         else
2493                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2494                         break;
2495                 }
2496                 return rc;
2497         }
2498         switch ( c->type ) {
2499         case SP_CHKPT:
2500                 if ( lutil_atoi( &si->si_chkops, c->argv[1] ) != 0 ) {
2501                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint ops # \"%s\"",
2502                                 c->argv[0], c->argv[1] );
2503                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2504                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2505                         return ARG_BAD_CONF;
2506                 }
2507                 if ( si->si_chkops <= 0 ) {
2508                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint ops # \"%d\"",
2509                                 c->argv[0], si->si_chkops );
2510                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2511                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2512                         return ARG_BAD_CONF;
2513                 }
2514                 if ( lutil_atoi( &si->si_chktime, c->argv[2] ) != 0 ) {
2515                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint time \"%s\"",
2516                                 c->argv[0], c->argv[1] );
2517                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2518                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2519                         return ARG_BAD_CONF;
2520                 }
2521                 if ( si->si_chktime <= 0 ) {
2522                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint time \"%d\"",
2523                                 c->argv[0], si->si_chkops );
2524                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2525                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2526                         return ARG_BAD_CONF;
2527                 }
2528                 si->si_chktime *= 60;
2529                 break;
2530         case SP_SESSL: {
2531                 sessionlog *sl;
2532                 int size = c->value_int;
2533
2534                 if ( size < 0 ) {
2535                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s size %d is negative",
2536                                 c->argv[0], size );
2537                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2538                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2539                         return ARG_BAD_CONF;
2540                 }
2541                 sl = si->si_logs;
2542                 if ( !sl ) {
2543                         sl = ch_malloc( sizeof( sessionlog ) + LDAP_LUTIL_CSNSTR_BUFSIZE );
2544                         sl->sl_mincsn.bv_val = (char *)(sl+1);
2545                         sl->sl_mincsn.bv_len = 0;
2546                         sl->sl_num = 0;
2547                         sl->sl_head = sl->sl_tail = NULL;
2548                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
2549                         si->si_logs = sl;
2550                 }
2551                 sl->sl_size = size;
2552                 }
2553                 break;
2554         case SP_NOPRES:
2555                 si->si_nopres = c->value_int;
2556                 break;
2557         case SP_USEHINT:
2558                 si->si_usehint = c->value_int;
2559                 break;
2560         }
2561         return rc;
2562 }
2563
2564 /* ITS#3456 we cannot run this search on the main thread, must use a
2565  * child thread in order to insure we have a big enough stack.
2566  */
2567 static void *
2568 syncprov_db_otask(
2569         void *ptr
2570 )
2571 {
2572         syncprov_findcsn( ptr, FIND_MAXCSN );
2573         return NULL;
2574 }
2575
2576 /* Read any existing contextCSN from the underlying db.
2577  * Then search for any entries newer than that. If no value exists,
2578  * just generate it. Cache whatever result.
2579  */
2580 static int
2581 syncprov_db_open(
2582         BackendDB *be,
2583         ConfigReply *cr
2584 )
2585 {
2586         slap_overinst   *on = (slap_overinst *) be->bd_info;
2587         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2588
2589         Connection conn = { 0 };
2590         OperationBuffer opbuf;
2591         Operation *op;
2592         Entry *e = NULL;
2593         Attribute *a;
2594         int rc;
2595         void *thrctx = NULL;
2596
2597         if ( !SLAP_LASTMOD( be )) {
2598                 Debug( LDAP_DEBUG_ANY,
2599                         "syncprov_db_open: invalid config, lastmod must be enabled\n", 0, 0, 0 );
2600                 return -1;
2601         }
2602
2603         if ( slapMode & SLAP_TOOL_MODE ) {
2604                 return 0;
2605         }
2606
2607         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
2608         if ( rc ) {
2609                 return rc;
2610         }
2611
2612         thrctx = ldap_pvt_thread_pool_context();
2613         connection_fake_init( &conn, &opbuf, thrctx );
2614         op = &opbuf.ob_op;
2615         op->o_bd = be;
2616         op->o_dn = be->be_rootdn;
2617         op->o_ndn = be->be_rootndn;
2618
2619         rc = overlay_entry_get_ov( op, be->be_nsuffix, NULL,
2620                 slap_schema.si_ad_contextCSN, 0, &e, on );
2621
2622         if ( e ) {
2623                 ldap_pvt_thread_t tid;
2624
2625                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
2626                 if ( a ) {
2627                         ber_bvarray_dup_x( &si->si_ctxcsn, a->a_vals, NULL );
2628                         si->si_numcsns = a->a_numvals;
2629                         si->si_sids = slap_parse_csn_sids( si->si_ctxcsn, a->a_numvals, NULL );
2630                 }
2631                 overlay_entry_release_ov( op, e, 0, on );
2632                 if ( si->si_ctxcsn ) {
2633                         op->o_req_dn = be->be_suffix[0];
2634                         op->o_req_ndn = be->be_nsuffix[0];
2635                         op->ors_scope = LDAP_SCOPE_SUBTREE;
2636                         ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
2637                         ldap_pvt_thread_join( tid, NULL );
2638                 }
2639         }
2640
2641         /* Didn't find a contextCSN, should we generate one? */
2642         if ( !si->si_ctxcsn ) {
2643                 char csnbuf[ LDAP_LUTIL_CSNSTR_BUFSIZE ];
2644                 struct berval csn;
2645
2646                 if ( SLAP_SYNC_SHADOW( op->o_bd )) {
2647                 /* If we're also a consumer, then don't generate anything.
2648                  * Wait for our provider to send it to us, or for a local
2649                  * modify if we have multimaster.
2650                  */
2651                         goto out;
2652                 }
2653                 csn.bv_val = csnbuf;
2654                 csn.bv_len = sizeof( csnbuf );
2655                 slap_get_csn( op, &csn, 0 );
2656                 value_add_one( &si->si_ctxcsn, &csn );
2657                 si->si_numcsns = 1;
2658                 si->si_sids = ch_malloc( sizeof(int) );
2659                 si->si_sids[0] = slap_serverID;
2660
2661                 /* make sure we do a checkpoint on close */
2662                 si->si_numops++;
2663         }
2664
2665 out:
2666         op->o_bd->bd_info = (BackendInfo *)on;
2667         return 0;
2668 }
2669
2670 /* Write the current contextCSN into the underlying db.
2671  */
2672 static int
2673 syncprov_db_close(
2674         BackendDB *be,
2675         ConfigReply *cr
2676 )
2677 {
2678     slap_overinst   *on = (slap_overinst *) be->bd_info;
2679     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2680
2681         if ( slapMode & SLAP_TOOL_MODE ) {
2682                 return 0;
2683         }
2684         if ( si->si_numops ) {
2685                 Connection conn = {0};
2686                 OperationBuffer opbuf;
2687                 Operation *op;
2688                 SlapReply rs = {REP_RESULT};
2689                 void *thrctx;
2690
2691                 thrctx = ldap_pvt_thread_pool_context();
2692                 connection_fake_init( &conn, &opbuf, thrctx );
2693                 op = &opbuf.ob_op;
2694                 op->o_bd = be;
2695                 op->o_dn = be->be_rootdn;
2696                 op->o_ndn = be->be_rootndn;
2697                 syncprov_checkpoint( op, &rs, on );
2698         }
2699
2700     return 0;
2701 }
2702
2703 static int
2704 syncprov_db_init(
2705         BackendDB *be,
2706         ConfigReply *cr
2707 )
2708 {
2709         slap_overinst   *on = (slap_overinst *)be->bd_info;
2710         syncprov_info_t *si;
2711
2712         if ( SLAP_ISGLOBALOVERLAY( be ) ) {
2713                 Debug( LDAP_DEBUG_ANY,
2714                         "syncprov must be instantiated within a database.\n",
2715                         0, 0, 0 );
2716                 return 1;
2717         }
2718
2719         si = ch_calloc(1, sizeof(syncprov_info_t));
2720         on->on_bi.bi_private = si;
2721         ldap_pvt_thread_rdwr_init( &si->si_csn_rwlock );
2722         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
2723         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
2724
2725         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
2726         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
2727         csn_anlist[1].an_desc = slap_schema.si_ad_entryUUID;
2728         csn_anlist[1].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2729
2730         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
2731         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2732
2733         return 0;
2734 }
2735
2736 static int
2737 syncprov_db_destroy(
2738         BackendDB *be,
2739         ConfigReply *cr
2740 )
2741 {
2742         slap_overinst   *on = (slap_overinst *)be->bd_info;
2743         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2744
2745         if ( si ) {
2746                 if ( si->si_logs ) {
2747                         slog_entry *se = si->si_logs->sl_head;
2748
2749                         while ( se ) {
2750                                 slog_entry *se_next = se->se_next;
2751                                 ch_free( se );
2752                                 se = se_next;
2753                         }
2754
2755                         ch_free( si->si_logs );
2756                 }
2757                 if ( si->si_ctxcsn )
2758                         ber_bvarray_free( si->si_ctxcsn );
2759                 if ( si->si_sids )
2760                         ch_free( si->si_sids );
2761                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
2762                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
2763                 ldap_pvt_thread_rdwr_destroy( &si->si_csn_rwlock );
2764                 ch_free( si );
2765         }
2766
2767         return 0;
2768 }
2769
2770 static int syncprov_parseCtrl (
2771         Operation *op,
2772         SlapReply *rs,
2773         LDAPControl *ctrl )
2774 {
2775         ber_tag_t tag;
2776         BerElementBuffer berbuf;
2777         BerElement *ber = (BerElement *)&berbuf;
2778         ber_int_t mode;
2779         ber_len_t len;
2780         struct berval cookie = BER_BVNULL;
2781         sync_control *sr;
2782         int rhint = 0;
2783
2784         if ( op->o_sync != SLAP_CONTROL_NONE ) {
2785                 rs->sr_text = "Sync control specified multiple times";
2786                 return LDAP_PROTOCOL_ERROR;
2787         }
2788
2789         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
2790                 rs->sr_text = "Sync control specified with pagedResults control";
2791                 return LDAP_PROTOCOL_ERROR;
2792         }
2793
2794         if ( BER_BVISNULL( &ctrl->ldctl_value ) ) {
2795                 rs->sr_text = "Sync control value is absent";
2796                 return LDAP_PROTOCOL_ERROR;
2797         }
2798
2799         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
2800                 rs->sr_text = "Sync control value is empty";
2801                 return LDAP_PROTOCOL_ERROR;
2802         }
2803
2804         /* Parse the control value
2805          *      syncRequestValue ::= SEQUENCE {
2806          *              mode   ENUMERATED {
2807          *                      -- 0 unused
2808          *                      refreshOnly             (1),
2809          *                      -- 2 reserved
2810          *                      refreshAndPersist       (3)
2811          *              },
2812          *              cookie  syncCookie OPTIONAL
2813          *      }
2814          */
2815
2816         ber_init2( ber, &ctrl->ldctl_value, 0 );
2817
2818         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
2819                 rs->sr_text = "Sync control : mode decoding error";
2820                 return LDAP_PROTOCOL_ERROR;
2821         }
2822
2823         switch( mode ) {
2824         case LDAP_SYNC_REFRESH_ONLY:
2825                 mode = SLAP_SYNC_REFRESH;
2826                 break;
2827         case LDAP_SYNC_REFRESH_AND_PERSIST:
2828                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
2829                 break;
2830         default:
2831                 rs->sr_text = "Sync control : unknown update mode";
2832                 return LDAP_PROTOCOL_ERROR;
2833         }
2834
2835         tag = ber_peek_tag( ber, &len );
2836
2837         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
2838                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
2839                         rs->sr_text = "Sync control : cookie decoding error";
2840                         return LDAP_PROTOCOL_ERROR;
2841                 }
2842                 tag = ber_peek_tag( ber, &len );
2843         }
2844         if ( tag == LDAP_TAG_RELOAD_HINT ) {
2845                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
2846                         rs->sr_text = "Sync control : rhint decoding error";
2847                         return LDAP_PROTOCOL_ERROR;
2848                 }
2849         }
2850         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
2851                         rs->sr_text = "Sync control : decoding error";
2852                         return LDAP_PROTOCOL_ERROR;
2853         }
2854         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
2855         sr->sr_rhint = rhint;
2856         if (!BER_BVISNULL(&cookie)) {
2857                 ber_dupbv_x( &sr->sr_state.octet_str, &cookie, op->o_tmpmemctx );
2858                 /* If parse fails, pretend no cookie was sent */
2859                 if ( slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx ) ||
2860                         sr->sr_state.rid == -1 ) {
2861                         if ( sr->sr_state.ctxcsn ) {
2862                                 ber_bvarray_free_x( sr->sr_state.ctxcsn, op->o_tmpmemctx );
2863                                 sr->sr_state.ctxcsn = NULL;
2864                         }
2865                         sr->sr_state.numcsns = 0;
2866                 }
2867         }
2868
2869         op->o_controls[slap_cids.sc_LDAPsync] = sr;
2870
2871         op->o_sync = ctrl->ldctl_iscritical
2872                 ? SLAP_CONTROL_CRITICAL
2873                 : SLAP_CONTROL_NONCRITICAL;
2874
2875         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
2876
2877         return LDAP_SUCCESS;
2878 }
2879
2880 /* This overlay is set up for dynamic loading via moduleload. For static
2881  * configuration, you'll need to arrange for the slap_overinst to be
2882  * initialized and registered by some other function inside slapd.
2883  */
2884
2885 static slap_overinst            syncprov;
2886
2887 int
2888 syncprov_initialize()
2889 {
2890         int rc;
2891
2892         rc = register_supported_control( LDAP_CONTROL_SYNC,
2893                 SLAP_CTRL_SEARCH, NULL,
2894                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
2895         if ( rc != LDAP_SUCCESS ) {
2896                 Debug( LDAP_DEBUG_ANY,
2897                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
2898                 return rc;
2899         }
2900
2901         syncprov.on_bi.bi_type = "syncprov";
2902         syncprov.on_bi.bi_db_init = syncprov_db_init;
2903         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
2904         syncprov.on_bi.bi_db_open = syncprov_db_open;
2905         syncprov.on_bi.bi_db_close = syncprov_db_close;
2906
2907         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
2908         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
2909
2910         syncprov.on_bi.bi_op_add = syncprov_op_mod;
2911         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
2912         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
2913         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
2914         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
2915         syncprov.on_bi.bi_op_search = syncprov_op_search;
2916         syncprov.on_bi.bi_extended = syncprov_op_extended;
2917         syncprov.on_bi.bi_operational = syncprov_operational;
2918
2919         syncprov.on_bi.bi_cf_ocs = spocs;
2920
2921         generic_filter.f_desc = slap_schema.si_ad_objectClass;
2922
2923         rc = config_register_schema( spcfg, spocs );
2924         if ( rc ) return rc;
2925
2926         return overlay_register( &syncprov );
2927 }
2928
2929 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
2930 int
2931 init_module( int argc, char *argv[] )
2932 {
2933         return syncprov_initialize();
2934 }
2935 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
2936
2937 #endif /* defined(SLAPD_OVER_SYNCPROV) */