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 2004-2005 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         struct berval s_filterstr;
  63         int             s_flags;        /* search status */
  64 #define PS_IS_REFRESHING        0x01
  65 #define PS_IS_DETACHED          0x02
  66 #define PS_WROTE_BASE           0x04
  67 #define PS_FIND_BASE            0x08
  68
  69         int             s_inuse;        /* reference count */
  70         struct syncres *s_res;
  71         struct syncres *s_restail;
  72         struct re_s     *s_qtask;       /* task for playing psearch responses */
  73 #define RUNQ_INTERVAL   36000   /* a long time */
  74         ldap_pvt_thread_mutex_t s_mutex;
  75 } syncops;
  76
  77 /* A received sync control */
  78 typedef struct sync_control {
  79         struct sync_cookie sr_state;
  80         int sr_rhint;
  81 } sync_control;
  82
  83 #if 0 /* moved back to slap.h */
  84 #define o_sync  o_ctrlflag[slap_cids.sc_LDAPsync]
  85 #endif
  86 /* o_sync_mode uses data bits of o_sync */
  87 #define o_sync_mode     o_ctrlflag[slap_cids.sc_LDAPsync]
  88
  89 #define SLAP_SYNC_NONE                                  (LDAP_SYNC_NONE<<SLAP_CONTROL_SHIFT)
  90 #define SLAP_SYNC_REFRESH                               (LDAP_SYNC_REFRESH_ONLY<<SLAP_CONTROL_SHIFT)
  91 #define SLAP_SYNC_PERSIST                               (LDAP_SYNC_RESERVED<<SLAP_CONTROL_SHIFT)
  92 #define SLAP_SYNC_REFRESH_AND_PERSIST   (LDAP_SYNC_REFRESH_AND_PERSIST<<SLAP_CONTROL_SHIFT)
  93
  94 /* Record of which searches matched at premodify step */
  95 typedef struct syncmatches {
  96         struct syncmatches *sm_next;
  97         syncops *sm_op;
  98 } syncmatches;
  99
 100 /* Session log data */
 101 typedef struct slog_entry {
 102         struct slog_entry *se_next;
 103         struct berval se_uuid;
 104         struct berval se_csn;
 105         ber_tag_t       se_tag;
 106 } slog_entry;
 107
 108 typedef struct sessionlog {
 109         struct berval   sl_mincsn;
 110         int             sl_num;
 111         int             sl_size;
 112         slog_entry *sl_head;
 113         slog_entry *sl_tail;
 114         ldap_pvt_thread_mutex_t sl_mutex;
 115 } sessionlog;
 116
 117 /* The main state for this overlay */
 118 typedef struct syncprov_info_t {
 119         syncops         *si_ops;
 120         struct berval   si_ctxcsn;      /* ldapsync context */
 121         int             si_chkops;      /* checkpointing info */
 122         int             si_chktime;
 123         int             si_numops;      /* number of ops since last checkpoint */
 124         int             si_nopres;      /* Skip present phase */
 125         int             si_usehint;     /* use reload hint */
 126         time_t  si_chklast;     /* time of last checkpoint */
 127         Avlnode *si_mods;       /* entries being modified */
 128         sessionlog      *si_logs;
 129         ldap_pvt_thread_mutex_t si_csn_mutex;
 130         ldap_pvt_thread_mutex_t si_ops_mutex;
 131         ldap_pvt_thread_mutex_t si_mods_mutex;
 132         char            si_ctxcsnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 133 } syncprov_info_t;
 134
 135 typedef struct opcookie {
 136         slap_overinst *son;
 137         syncmatches *smatches;
 138         struct berval sdn;      /* DN of entry, for deletes */
 139         struct berval sndn;
 140         struct berval suuid;    /* UUID of entry */
 141         struct berval sctxcsn;
 142         int sreference; /* Is the entry a reference? */
 143 } opcookie;
 144
 145 typedef struct fbase_cookie {
 146         struct berval *fdn;     /* DN of a modified entry, for scope testing */
 147         syncops *fss;   /* persistent search we're testing against */
 148         int fbase;      /* if TRUE we found the search base and it's still valid */
 149         int fscope;     /* if TRUE then fdn is within the psearch scope */
 150 } fbase_cookie;
 151
 152 static AttributeName csn_anlist[3];
 153 static AttributeName uuid_anlist[2];
 154
 155 /* Build a LDAPsync intermediate state control */
 156 static int
 157 syncprov_state_ctrl(
 158         Operation       *op,
 159         SlapReply       *rs,
 160         Entry           *e,
 161         int             entry_sync_state,
 162         LDAPControl     **ctrls,
 163         int             num_ctrls,
 164         int             send_cookie,
 165         struct berval   *cookie )
 166 {
 167         Attribute* a;
 168         int ret;
 169
 170         BerElementBuffer berbuf;
 171         BerElement *ber = (BerElement *)&berbuf;
 172
 173         struct berval   entryuuid_bv = BER_BVNULL;
 174
 175         ber_init2( ber, 0, LBER_USE_DER );
 176         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 177
 178         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 179
 180         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 181                 AttributeDescription *desc = a->a_desc;
 182                 if ( desc == slap_schema.si_ad_entryUUID ) {
 183                         entryuuid_bv = a->a_nvals[0];
 184                         break;
 185                 }
 186         }
 187
 188         /* FIXME: what if entryuuid is NULL or empty ? */
 189
 190         if ( send_cookie && cookie ) {
 191                 ber_printf( ber, "{eOON}",
 192                         entry_sync_state, &entryuuid_bv, cookie );
 193         } else {
 194                 ber_printf( ber, "{eON}",
 195                         entry_sync_state, &entryuuid_bv );
 196         }
 197
 198         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 199         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 200         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 201
 202         ber_free_buf( ber );
 203
 204         if ( ret < 0 ) {
 205                 Debug( LDAP_DEBUG_TRACE,
 206                         "slap_build_sync_ctrl: ber_flatten2 failed\n",
 207                         0, 0, 0 );
 208                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 209                 return ret;
 210         }
 211
 212         return LDAP_SUCCESS;
 213 }
 214
 215 /* Build a LDAPsync final state control */
 216 static int
 217 syncprov_done_ctrl(
 218         Operation       *op,
 219         SlapReply       *rs,
 220         LDAPControl     **ctrls,
 221         int                     num_ctrls,
 222         int                     send_cookie,
 223         struct berval *cookie,
 224         int                     refreshDeletes )
 225 {
 226         int ret;
 227         BerElementBuffer berbuf;
 228         BerElement *ber = (BerElement *)&berbuf;
 229
 230         ber_init2( ber, NULL, LBER_USE_DER );
 231         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 232
 233         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 234
 235         ber_printf( ber, "{" );
 236         if ( send_cookie && cookie ) {
 237                 ber_printf( ber, "O", cookie );
 238         }
 239         if ( refreshDeletes == LDAP_SYNC_REFRESH_DELETES ) {
 240                 ber_printf( ber, "b", refreshDeletes );
 241         }
 242         ber_printf( ber, "N}" );
 243
 244         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_DONE;
 245         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 246         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 247
 248         ber_free_buf( ber );
 249
 250         if ( ret < 0 ) {
 251                 Debug( LDAP_DEBUG_TRACE,
 252                         "syncprov_done_ctrl: ber_flatten2 failed\n",
 253                         0, 0, 0 );
 254                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 255                 return ret;
 256         }
 257
 258         return LDAP_SUCCESS;
 259 }
 260
 261 static int
 262 syncprov_sendinfo(
 263         Operation       *op,
 264         SlapReply       *rs,
 265         int                     type,
 266         struct berval *cookie,
 267         int                     refreshDone,
 268         BerVarray       syncUUIDs,
 269         int                     refreshDeletes )
 270 {
 271         BerElementBuffer berbuf;
 272         BerElement *ber = (BerElement *)&berbuf;
 273         struct berval rspdata;
 274
 275         int ret;
 276
 277         ber_init2( ber, NULL, LBER_USE_DER );
 278         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 279
 280         if ( type ) {
 281                 switch ( type ) {
 282                 case LDAP_TAG_SYNC_NEW_COOKIE:
 283                         ber_printf( ber, "tO", type, cookie );
 284                         break;
 285                 case LDAP_TAG_SYNC_REFRESH_DELETE:
 286                 case LDAP_TAG_SYNC_REFRESH_PRESENT:
 287                         ber_printf( ber, "t{", type );
 288                         if ( cookie ) {
 289                                 ber_printf( ber, "O", cookie );
 290                         }
 291                         if ( refreshDone == 0 ) {
 292                                 ber_printf( ber, "b", refreshDone );
 293                         }
 294                         ber_printf( ber, "N}" );
 295                         break;
 296                 case LDAP_TAG_SYNC_ID_SET:
 297                         ber_printf( ber, "t{", type );
 298                         if ( cookie ) {
 299                                 ber_printf( ber, "O", cookie );
 300                         }
 301                         if ( refreshDeletes == 1 ) {
 302                                 ber_printf( ber, "b", refreshDeletes );
 303                         }
 304                         ber_printf( ber, "[W]", syncUUIDs );
 305                         ber_printf( ber, "N}" );
 306                         break;
 307                 default:
 308                         Debug( LDAP_DEBUG_TRACE,
 309                                 "syncprov_sendinfo: invalid syncinfo type (%d)\n",
 310                                 type, 0, 0 );
 311                         return LDAP_OTHER;
 312                 }
 313         }
 314
 315         ret = ber_flatten2( ber, &rspdata, 0 );
 316
 317         if ( ret < 0 ) {
 318                 Debug( LDAP_DEBUG_TRACE,
 319                         "syncprov_sendinfo: ber_flatten2 failed\n",
 320                         0, 0, 0 );
 321                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 322                 return ret;
 323         }
 324
 325         rs->sr_rspoid = LDAP_SYNC_INFO;
 326         rs->sr_rspdata = &rspdata;
 327         send_ldap_intermediate( op, rs );
 328         rs->sr_rspdata = NULL;
 329         ber_free_buf( ber );
 330
 331         return LDAP_SUCCESS;
 332 }
 333
 334 /* Find a modtarget in an AVL tree */
 335 static int
 336 sp_avl_cmp( const void *c1, const void *c2 )
 337 {
 338         const modtarget *m1, *m2;
 339         int rc;
 340
 341         m1 = c1; m2 = c2;
 342         rc = m1->mt_op->o_req_ndn.bv_len - m2->mt_op->o_req_ndn.bv_len;
 343
 344         if ( rc ) return rc;
 345         return ber_bvcmp( &m1->mt_op->o_req_ndn, &m2->mt_op->o_req_ndn );
 346 }
 347
 348 /* syncprov_findbase:
 349  *   finds the true DN of the base of a search (with alias dereferencing) and
 350  * checks to make sure the base entry doesn't get replaced with a different
 351  * entry (e.g., swapping trees via ModDN, or retargeting an alias). If a
 352  * change is detected, any persistent search on this base must be terminated /
 353  * reloaded.
 354  *   On the first call, we just save the DN and entryID. On subsequent calls
 355  * we compare the DN and entryID with the saved values.
 356  */
 357 static int
 358 findbase_cb( Operation *op, SlapReply *rs )
 359 {
 360         slap_callback *sc = op->o_callback;
 361
 362         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 363                 fbase_cookie *fc = sc->sc_private;
 364
 365                 /* If no entryID, we're looking for the first time.
 366                  * Just store whatever we got.
 367                  */
 368                 if ( fc->fss->s_eid == NOID ) {
 369                         fc->fbase = 2;
 370                         fc->fss->s_eid = rs->sr_entry->e_id;
 371                         ber_dupbv( &fc->fss->s_base, &rs->sr_entry->e_nname );
 372
 373                 } else if ( rs->sr_entry->e_id == fc->fss->s_eid &&
 374                         dn_match( &rs->sr_entry->e_nname, &fc->fss->s_base )) {
 375
 376                 /* OK, the DN is the same and the entryID is the same. */
 377                         fc->fbase = 1;
 378                 }
 379         }
 380         if ( rs->sr_err != LDAP_SUCCESS ) {
 381                 Debug( LDAP_DEBUG_ANY, "findbase failed! %d\n", rs->sr_err,0,0 );
 382         }
 383         return LDAP_SUCCESS;
 384 }
 385
 386 static Filter generic_filter = { LDAP_FILTER_PRESENT, { 0 }, NULL };
 387 static struct berval generic_filterstr = BER_BVC("(objectclass=*)");
 388
 389 static int
 390 syncprov_findbase( Operation *op, fbase_cookie *fc )
 391 {
 392         opcookie *opc = op->o_callback->sc_private;
 393         slap_overinst *on = opc->son;
 394
 395         /* Use basic parameters from syncrepl search, but use
 396          * current op's threadctx / tmpmemctx
 397          */
 398         ldap_pvt_thread_mutex_lock( &fc->fss->s_mutex );
 399         if ( fc->fss->s_flags & PS_FIND_BASE ) {
 400                 slap_callback cb = {0};
 401                 Operation fop;
 402                 SlapReply frs = { REP_RESULT };
 403                 int rc;
 404
 405                 fc->fss->s_flags ^= PS_FIND_BASE;
 406                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 407
 408                 fop = *fc->fss->s_op;
 409
 410                 fop.o_hdr = op->o_hdr;
 411                 fop.o_bd = op->o_bd;
 412                 fop.o_time = op->o_time;
 413                 fop.o_tincr = op->o_tincr;
 414
 415                 cb.sc_response = findbase_cb;
 416                 cb.sc_private = fc;
 417
 418                 fop.o_sync_mode = 0;    /* turn off sync mode */
 419                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 420                 fop.o_callback = &cb;
 421                 fop.o_tag = LDAP_REQ_SEARCH;
 422                 fop.ors_scope = LDAP_SCOPE_BASE;
 423                 fop.ors_limit = NULL;
 424                 fop.ors_slimit = 1;
 425                 fop.ors_tlimit = SLAP_NO_LIMIT;
 426                 fop.ors_attrs = slap_anlist_no_attrs;
 427                 fop.ors_attrsonly = 1;
 428                 fop.ors_filter = &generic_filter;
 429                 fop.ors_filterstr = generic_filterstr;
 430
 431                 fop.o_bd->bd_info = on->on_info->oi_orig;
 432                 rc = fop.o_bd->be_search( &fop, &frs );
 433                 fop.o_bd->bd_info = (BackendInfo *)on;
 434         } else {
 435                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 436                 fc->fbase = 1;
 437         }
 438
 439         /* After the first call, see if the fdn resides in the scope */
 440         if ( fc->fbase == 1 ) {
 441                 switch ( fc->fss->s_op->ors_scope ) {
 442                 case LDAP_SCOPE_BASE:
 443                         fc->fscope = dn_match( fc->fdn, &fc->fss->s_base );
 444                         break;
 445                 case LDAP_SCOPE_ONELEVEL: {
 446                         struct berval pdn;
 447                         dnParent( fc->fdn, &pdn );
 448                         fc->fscope = dn_match( &pdn, &fc->fss->s_base );
 449                         break; }
 450                 case LDAP_SCOPE_SUBTREE:
 451                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base );
 452                         break;
 453 #ifdef LDAP_SCOPE_SUBORDINATE
 454                 case LDAP_SCOPE_SUBORDINATE:
 455                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base ) &&
 456                                 !dn_match( fc->fdn, &fc->fss->s_base );
 457                         break;
 458 #endif
 459                 }
 460         }
 461
 462         if ( fc->fbase )
 463                 return LDAP_SUCCESS;
 464
 465         /* If entryID has changed, then the base of this search has
 466          * changed. Invalidate the psearch.
 467          */
 468         return LDAP_NO_SUCH_OBJECT;
 469 }
 470
 471 /* syncprov_findcsn:
 472  *   This function has three different purposes, but they all use a search
 473  * that filters on entryCSN so they're combined here.
 474  * 1: at startup time, after a contextCSN has been read from the database,
 475  * we search for all entries with CSN >= contextCSN in case the contextCSN
 476  * was not checkpointed at the previous shutdown.
 477  *
 478  * 2: when the current contextCSN is known and we have a sync cookie, we search
 479  * for one entry with CSN = the cookie CSN. If not found, try <= cookie CSN.
 480  * If an entry is found, the cookie CSN is valid, otherwise it is stale.
 481  *
 482  * 3: during a refresh phase, we search for all entries with CSN <= the cookie
 483  * CSN, and generate Present records for them. We always collect this result
 484  * in SyncID sets, even if there's only one match.
 485  */
 486 typedef enum find_csn_t {
 487         FIND_MAXCSN     = 1,
 488         FIND_CSN        = 2,
 489         FIND_PRESENT    = 3
 490 } find_csn_t;
 491
 492 static int
 493 findmax_cb( Operation *op, SlapReply *rs )
 494 {
 495         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 496                 struct berval *maxcsn = op->o_callback->sc_private;
 497                 Attribute *a = attr_find( rs->sr_entry->e_attrs,
 498                         slap_schema.si_ad_entryCSN );
 499
 500                 if ( a && ber_bvcmp( &a->a_vals[0], maxcsn ) > 0 ) {
 501                         maxcsn->bv_len = a->a_vals[0].bv_len;
 502                         strcpy( maxcsn->bv_val, a->a_vals[0].bv_val );
 503                 }
 504         }
 505         return LDAP_SUCCESS;
 506 }
 507
 508 static int
 509 findcsn_cb( Operation *op, SlapReply *rs )
 510 {
 511         slap_callback *sc = op->o_callback;
 512
 513         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 514                 sc->sc_private = (void *)1;
 515         }
 516         return LDAP_SUCCESS;
 517 }
 518
 519 /* Build a list of entryUUIDs for sending in a SyncID set */
 520
 521 #define UUID_LEN        16
 522
 523 typedef struct fpres_cookie {
 524         int num;
 525         BerVarray uuids;
 526         char *last;
 527 } fpres_cookie;
 528
 529 static int
 530 findpres_cb( Operation *op, SlapReply *rs )
 531 {
 532         slap_callback *sc = op->o_callback;
 533         fpres_cookie *pc = sc->sc_private;
 534         Attribute *a;
 535         int ret = SLAP_CB_CONTINUE;
 536
 537         switch ( rs->sr_type ) {
 538         case REP_SEARCH:
 539                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryUUID );
 540                 if ( a ) {
 541                         pc->uuids[pc->num].bv_val = pc->last;
 542                         AC_MEMCPY( pc->uuids[pc->num].bv_val, a->a_nvals[0].bv_val,
 543                                 pc->uuids[pc->num].bv_len );
 544                         pc->num++;
 545                         pc->last = pc->uuids[pc->num].bv_val;
 546                         pc->uuids[pc->num].bv_val = NULL;
 547                 }
 548                 ret = LDAP_SUCCESS;
 549                 if ( pc->num != SLAP_SYNCUUID_SET_SIZE )
 550                         break;
 551                 /* FALLTHRU */
 552         case REP_RESULT:
 553                 ret = rs->sr_err;
 554                 if ( pc->num ) {
 555                         ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 556                                 0, pc->uuids, 0 );
 557                         pc->uuids[pc->num].bv_val = pc->last;
 558                         pc->num = 0;
 559                         pc->last = pc->uuids[0].bv_val;
 560                 }
 561                 break;
 562         default:
 563                 break;
 564         }
 565         return ret;
 566 }
 567
 568 static int
 569 syncprov_findcsn( Operation *op, find_csn_t mode )
 570 {
 571         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 572         syncprov_info_t         *si = on->on_bi.bi_private;
 573
 574         slap_callback cb = {0};
 575         Operation fop;
 576         SlapReply frs = { REP_RESULT };
 577         char buf[LDAP_LUTIL_CSNSTR_BUFSIZE + STRLENOF("(entryCSN<=)")];
 578         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 579         struct berval maxcsn;
 580         Filter cf, af;
 581 #ifdef LDAP_COMP_MATCH
 582         AttributeAssertion eq = { NULL, BER_BVNULL, NULL };
 583 #else
 584         AttributeAssertion eq = { NULL, BER_BVNULL };
 585 #endif
 586         int i, rc = LDAP_SUCCESS;
 587         fpres_cookie pcookie;
 588         sync_control *srs = NULL;
 589         int findcsn_retry = 1;
 590
 591         if ( mode != FIND_MAXCSN ) {
 592                 srs = op->o_controls[slap_cids.sc_LDAPsync];
 593
 594                 if ( srs->sr_state.ctxcsn.bv_len >= LDAP_LUTIL_CSNSTR_BUFSIZE ) {
 595                         return LDAP_OTHER;
 596                 }
 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         cf.f_next = NULL;
 607
 608         fop.o_callback = &cb;
 609         fop.ors_limit = NULL;
 610         fop.ors_tlimit = SLAP_NO_LIMIT;
 611         fop.ors_filter = &cf;
 612         fop.ors_filterstr.bv_val = buf;
 613
 614 again:
 615         switch( mode ) {
 616         case FIND_MAXCSN:
 617                 cf.f_choice = LDAP_FILTER_GE;
 618                 cf.f_av_value = si->si_ctxcsn;
 619                 fop.ors_filterstr.bv_len = sprintf( buf, "(entryCSN>=%s)",
 620                         cf.f_av_value.bv_val );
 621                 fop.ors_attrsonly = 0;
 622                 fop.ors_attrs = csn_anlist;
 623                 fop.ors_slimit = SLAP_NO_LIMIT;
 624                 cb.sc_private = &maxcsn;
 625                 cb.sc_response = findmax_cb;
 626                 strcpy( cbuf, si->si_ctxcsn.bv_val );
 627                 maxcsn.bv_val = cbuf;
 628                 maxcsn.bv_len = si->si_ctxcsn.bv_len;
 629                 break;
 630         case FIND_CSN:
 631                 cf.f_av_value = srs->sr_state.ctxcsn;
 632                 /* Look for exact match the first time */
 633                 if ( findcsn_retry ) {
 634                         cf.f_choice = LDAP_FILTER_EQUALITY;
 635                         fop.ors_filterstr.bv_len = sprintf( buf, "(entryCSN=%s)",
 636                                 cf.f_av_value.bv_val );
 637                 /* On retry, look for <= */
 638                 } else {
 639                         cf.f_choice = LDAP_FILTER_LE;
 640                         fop.ors_filterstr.bv_len = sprintf( buf, "(entryCSN<=%s)",
 641                                 cf.f_av_value.bv_val );
 642                 }
 643                 fop.ors_attrsonly = 1;
 644                 fop.ors_attrs = slap_anlist_no_attrs;
 645                 fop.ors_slimit = 1;
 646                 cb.sc_private = NULL;
 647                 cb.sc_response = findcsn_cb;
 648                 break;
 649         case FIND_PRESENT:
 650                 af.f_choice = LDAP_FILTER_AND;
 651                 af.f_next = NULL;
 652                 af.f_and = &cf;
 653                 cf.f_choice = LDAP_FILTER_LE;
 654                 cf.f_av_value = srs->sr_state.ctxcsn;
 655                 cf.f_next = op->ors_filter;
 656                 fop.ors_filter = &af;
 657                 filter2bv_x( &fop, fop.ors_filter, &fop.ors_filterstr );
 658                 fop.ors_attrsonly = 0;
 659                 fop.ors_attrs = uuid_anlist;
 660                 fop.ors_slimit = SLAP_NO_LIMIT;
 661                 cb.sc_private = &pcookie;
 662                 cb.sc_response = findpres_cb;
 663                 pcookie.num = 0;
 664
 665                 /* preallocate storage for a full set */
 666                 pcookie.uuids = op->o_tmpalloc( (SLAP_SYNCUUID_SET_SIZE+1) *
 667                         sizeof(struct berval) + SLAP_SYNCUUID_SET_SIZE * UUID_LEN,
 668                         op->o_tmpmemctx );
 669                 pcookie.last = (char *)(pcookie.uuids + SLAP_SYNCUUID_SET_SIZE+1);
 670                 pcookie.uuids[0].bv_val = pcookie.last;
 671                 pcookie.uuids[0].bv_len = UUID_LEN;
 672                 for (i=1; i<SLAP_SYNCUUID_SET_SIZE; i++) {
 673                         pcookie.uuids[i].bv_val = pcookie.uuids[i-1].bv_val + UUID_LEN;
 674                         pcookie.uuids[i].bv_len = UUID_LEN;
 675                 }
 676                 break;
 677         }
 678
 679         fop.o_bd->bd_info = on->on_info->oi_orig;
 680         fop.o_bd->be_search( &fop, &frs );
 681         fop.o_bd->bd_info = (BackendInfo *)on;
 682
 683         switch( mode ) {
 684         case FIND_MAXCSN:
 685                 strcpy( si->si_ctxcsnbuf, maxcsn.bv_val );
 686                 si->si_ctxcsn.bv_len = maxcsn.bv_len;
 687                 break;
 688         case FIND_CSN:
 689                 /* If matching CSN was not found, invalidate the context. */
 690                 if ( !cb.sc_private ) {
 691                         /* If we didn't find an exact match, then try for <= */
 692                         if ( findcsn_retry ) {
 693                                 findcsn_retry = 0;
 694                                 goto again;
 695                         }
 696                         rc = LDAP_NO_SUCH_OBJECT;
 697                 }
 698                 break;
 699         case FIND_PRESENT:
 700                 op->o_tmpfree( pcookie.uuids, op->o_tmpmemctx );
 701                 op->o_tmpfree( fop.ors_filterstr.bv_val, op->o_tmpmemctx );
 702                 break;
 703         }
 704
 705         return rc;
 706 }
 707
 708 static void
 709 syncprov_free_syncop( syncops *so )
 710 {
 711         syncres *sr, *srnext;
 712         GroupAssertion *ga, *gnext;
 713
 714         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 715         if ( --so->s_inuse > 0 ) {
 716                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 717                 return;
 718         }
 719         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 720         if ( so->s_flags & PS_IS_DETACHED ) {
 721                 filter_free( so->s_op->ors_filter );
 722                 for ( ga = so->s_op->o_groups; ga; ga=gnext ) {
 723                         gnext = ga->ga_next;
 724                         ch_free( ga );
 725                 }
 726                 ch_free( so->s_op );
 727         }
 728         ch_free( so->s_base.bv_val );
 729         for ( sr=so->s_res; sr; sr=srnext ) {
 730                 srnext = sr->s_next;
 731                 ch_free( sr );
 732         }
 733         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 734         ch_free( so );
 735 }
 736
 737 /* Send a persistent search response */
 738 static int
 739 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so,
 740         Entry **e, int mode )
 741 {
 742         slap_overinst *on = opc->son;
 743
 744         SlapReply rs = { REP_SEARCH };
 745         LDAPControl *ctrls[2];
 746         struct berval cookie;
 747         Entry e_uuid = {0};
 748         Attribute a_uuid = {0};
 749
 750         if ( so->s_op->o_abandon )
 751                 return SLAPD_ABANDON;
 752
 753         ctrls[1] = NULL;
 754         slap_compose_sync_cookie( op, &cookie, &opc->sctxcsn, so->s_rid );
 755
 756         e_uuid.e_attrs = &a_uuid;
 757         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 758         a_uuid.a_nvals = &opc->suuid;
 759         rs.sr_err = syncprov_state_ctrl( op, &rs, &e_uuid,
 760                 mode, ctrls, 0, 1, &cookie );
 761         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
 762
 763         rs.sr_ctrls = ctrls;
 764         op->o_bd->bd_info = (BackendInfo *)on->on_info;
 765         switch( mode ) {
 766         case LDAP_SYNC_ADD:
 767                 rs.sr_entry = *e;
 768                 if ( rs.sr_entry->e_private )
 769                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 770                 if ( opc->sreference ) {
 771                         rs.sr_ref = get_entry_referrals( op, rs.sr_entry );
 772                         send_search_reference( op, &rs );
 773                         ber_bvarray_free( rs.sr_ref );
 774                         if ( !rs.sr_entry )
 775                                 *e = NULL;
 776                         break;
 777                 }
 778                 /* fallthru */
 779         case LDAP_SYNC_MODIFY:
 780                 rs.sr_entry = *e;
 781                 if ( rs.sr_entry->e_private )
 782                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 783                 rs.sr_attrs = op->ors_attrs;
 784                 send_search_entry( op, &rs );
 785                 if ( !rs.sr_entry )
 786                         *e = NULL;
 787                 break;
 788         case LDAP_SYNC_DELETE:
 789                 e_uuid.e_attrs = NULL;
 790                 e_uuid.e_name = opc->sdn;
 791                 e_uuid.e_nname = opc->sndn;
 792                 rs.sr_entry = &e_uuid;
 793                 if ( opc->sreference ) {
 794                         struct berval bv = BER_BVNULL;
 795                         rs.sr_ref = &bv;
 796                         send_search_reference( op, &rs );
 797                 } else {
 798                         send_search_entry( op, &rs );
 799                 }
 800                 break;
 801         default:
 802                 assert(0);
 803         }
 804         /* In case someone else freed it already? */
 805         if ( rs.sr_ctrls ) {
 806                 op->o_tmpfree( rs.sr_ctrls[0], op->o_tmpmemctx );
 807                 rs.sr_ctrls = NULL;
 808         }
 809
 810         return rs.sr_err;
 811 }
 812
 813 /* Play back queued responses */
 814 static int
 815 syncprov_qplay( Operation *op, slap_overinst *on, syncops *so )
 816 {
 817         syncres *sr;
 818         Entry *e;
 819         opcookie opc;
 820         int rc;
 821
 822         opc.son = on;
 823         op->o_bd->bd_info = (BackendInfo *)on->on_info;
 824
 825         for (;;) {
 826                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 827                 sr = so->s_res;
 828                 if ( sr )
 829                         so->s_res = sr->s_next;
 830                 if ( !so->s_res )
 831                         so->s_restail = NULL;
 832                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 833
 834                 if ( !sr || so->s_op->o_abandon )
 835                         break;
 836
 837                 opc.sdn = sr->s_dn;
 838                 opc.sndn = sr->s_ndn;
 839                 opc.suuid = sr->s_uuid;
 840                 opc.sctxcsn = sr->s_csn;
 841                 opc.sreference = sr->s_isreference;
 842                 e = NULL;
 843
 844                 if ( sr->s_mode != LDAP_SYNC_DELETE ) {
 845                         rc = be_entry_get_rw( op, &opc.sndn, NULL, NULL, 0, &e );
 846                         if ( rc ) {
 847                                 ch_free( sr );
 848                                 continue;
 849                         }
 850                 }
 851                 rc = syncprov_sendresp( op, &opc, so, &e, sr->s_mode );
 852
 853                 if ( e ) {
 854                         be_entry_release_rw( op, e, 0 );
 855                 }
 856
 857                 ch_free( sr );
 858
 859                 if ( rc )
 860                         break;
 861         }
 862         op->o_bd->bd_info = (BackendInfo *)on;
 863         return rc;
 864 }
 865
 866 /* runqueue task for playing back queued responses */
 867 static void *
 868 syncprov_qtask( void *ctx, void *arg )
 869 {
 870         struct re_s *rtask = arg;
 871         syncops *so = rtask->arg;
 872         slap_overinst *on = so->s_op->o_private;
 873         OperationBuffer opbuf;
 874         Operation *op;
 875         BackendDB be;
 876
 877         op = (Operation *) &opbuf;
 878         *op = *so->s_op;
 879         op->o_hdr = (Opheader *)(op+1);
 880         op->o_controls = (void **)(op->o_hdr+1);
 881         memset( op->o_controls, 0, SLAP_MAX_CIDS * sizeof(void *));
 882
 883         *op->o_hdr = *so->s_op->o_hdr;
 884
 885         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx);
 886         op->o_tmpmfuncs = &slap_sl_mfuncs;
 887         op->o_threadctx = ctx;
 888
 889         /* syncprov_qplay expects a fake db */
 890         be = *so->s_op->o_bd;
 891         be.be_flags |= SLAP_DBFLAG_OVERLAY;
 892         op->o_bd = &be;
 893         op->o_private = NULL;
 894         op->o_callback = NULL;
 895
 896         syncprov_qplay( op, on, so );
 897
 898         /* decrement use count... */
 899         syncprov_free_syncop( so );
 900
 901         /* wait until we get explicitly scheduled again */
 902         ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
 903         ldap_pvt_runqueue_stoptask( &slapd_rq, so->s_qtask );
 904         ldap_pvt_runqueue_resched( &slapd_rq, so->s_qtask, 1 );
 905         ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
 906
 907         return NULL;
 908 }
 909
 910 /* Queue a persistent search response */
 911 static int
 912 syncprov_qresp( opcookie *opc, syncops *so, int mode )
 913 {
 914         syncres *sr;
 915
 916         sr = ch_malloc(sizeof(syncres) + opc->suuid.bv_len + 1 +
 917                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1 + opc->sctxcsn.bv_len + 1 );
 918         sr->s_next = NULL;
 919         sr->s_dn.bv_val = (char *)(sr + 1);
 920         sr->s_dn.bv_len = opc->sdn.bv_len;
 921         sr->s_mode = mode;
 922         sr->s_isreference = opc->sreference;
 923         sr->s_ndn.bv_val = lutil_strcopy( sr->s_dn.bv_val,
 924                  opc->sdn.bv_val ) + 1;
 925         sr->s_ndn.bv_len = opc->sndn.bv_len;
 926         sr->s_uuid.bv_val = lutil_strcopy( sr->s_ndn.bv_val,
 927                  opc->sndn.bv_val ) + 1;
 928         sr->s_uuid.bv_len = opc->suuid.bv_len;
 929         AC_MEMCPY( sr->s_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
 930         sr->s_csn.bv_val = sr->s_uuid.bv_val + sr->s_uuid.bv_len + 1;
 931         sr->s_csn.bv_len = opc->sctxcsn.bv_len;
 932         strcpy( sr->s_csn.bv_val, opc->sctxcsn.bv_val );
 933
 934         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 935         if ( !so->s_res ) {
 936                 so->s_res = sr;
 937         } else {
 938                 so->s_restail->s_next = sr;
 939         }
 940         so->s_restail = sr;
 941
 942         /* If the base of the psearch was modified, check it next time round */
 943         if ( so->s_flags & PS_WROTE_BASE ) {
 944                 so->s_flags ^= PS_WROTE_BASE;
 945                 so->s_flags |= PS_FIND_BASE;
 946         }
 947         if ( so->s_flags & PS_IS_DETACHED ) {
 948                 ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
 949                 if ( !so->s_qtask ) {
 950                         so->s_qtask = ldap_pvt_runqueue_insert( &slapd_rq, RUNQ_INTERVAL,
 951                                 syncprov_qtask, so, "syncprov_qtask",
 952                                 so->s_op->o_conn->c_peer_name.bv_val );
 953                         ++so->s_inuse;
 954                 } else {
 955                         if (!ldap_pvt_runqueue_isrunning( &slapd_rq, so->s_qtask ) &&
 956                                 !so->s_qtask->next_sched.tv_sec ) {
 957                                 so->s_qtask->interval.tv_sec = 0;
 958                                 ldap_pvt_runqueue_resched( &slapd_rq, so->s_qtask, 0 );
 959                                 so->s_qtask->interval.tv_sec = RUNQ_INTERVAL;
 960                                 ++so->s_inuse;
 961                         }
 962                 }
 963                 ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
 964         }
 965         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 966         return LDAP_SUCCESS;
 967 }
 968
 969 static int
 970 syncprov_drop_psearch( syncops *so, int lock )
 971 {
 972         if ( so->s_flags & PS_IS_DETACHED ) {
 973                 if ( lock )
 974                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
 975                 so->s_op->o_conn->c_n_ops_executing--;
 976                 so->s_op->o_conn->c_n_ops_completed++;
 977                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, slap_op,
 978                         o_next );
 979                 if ( lock )
 980                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
 981         }
 982         syncprov_free_syncop( so );
 983
 984         return 0;
 985 }
 986
 987 static int
 988 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
 989 {
 990         slap_callback *sc = op->o_callback;
 991         op->o_callback = sc->sc_next;
 992         syncprov_drop_psearch( op->o_callback->sc_private, 0 );
 993         op->o_tmpfree( sc, op->o_tmpmemctx );
 994         return 0;
 995 }
 996
 997 static int
 998 syncprov_op_abandon( Operation *op, SlapReply *rs )
 999 {
1000         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1001         syncprov_info_t         *si = on->on_bi.bi_private;
1002         syncops *so, *soprev;
1003
1004         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1005         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
1006                 soprev=so, so=so->s_next ) {
1007                 if ( so->s_op->o_connid == op->o_connid &&
1008                         so->s_op->o_msgid == op->orn_msgid ) {
1009                                 so->s_op->o_abandon = 1;
1010                                 soprev->s_next = so->s_next;
1011                                 break;
1012                 }
1013         }
1014         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1015         if ( so ) {
1016                 /* Is this really a Cancel exop? */
1017                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
1018                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
1019                         rs->sr_err = LDAP_CANCELLED;
1020                         send_ldap_result( so->s_op, rs );
1021                         if ( so->s_flags & PS_IS_DETACHED ) {
1022                                 slap_callback *cb;
1023                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
1024                                 cb->sc_cleanup = syncprov_ab_cleanup;
1025                                 cb->sc_next = op->o_callback;
1026                                 cb->sc_private = so;
1027                                 return SLAP_CB_CONTINUE;
1028                         }
1029                 }
1030                 syncprov_drop_psearch( so, 0 );
1031         }
1032         return SLAP_CB_CONTINUE;
1033 }
1034
1035 /* Find which persistent searches are affected by this operation */
1036 static void
1037 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
1038 {
1039         slap_overinst *on = opc->son;
1040         syncprov_info_t         *si = on->on_bi.bi_private;
1041
1042         fbase_cookie fc;
1043         syncops *ss, *sprev, *snext;
1044         Entry *e;
1045         Attribute *a;
1046         int rc;
1047         struct berval newdn;
1048         int freefdn = 0;
1049
1050         fc.fdn = &op->o_req_ndn;
1051         /* compute new DN */
1052         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1053                 struct berval pdn;
1054                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
1055                 else dnParent( fc.fdn, &pdn );
1056                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
1057                 fc.fdn = &newdn;
1058                 freefdn = 1;
1059         }
1060         if ( op->o_tag != LDAP_REQ_ADD ) {
1061                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
1062                 rc = be_entry_get_rw( op, fc.fdn, NULL, NULL, 0, &e );
1063                 /* If we're sending responses now, make a copy and unlock the DB */
1064                 if ( e && !saveit ) {
1065                         Entry *e2 = entry_dup( e );
1066                         be_entry_release_rw( op, e, 0 );
1067                         e = e2;
1068                 }
1069                 op->o_bd->bd_info = (BackendInfo *)on;
1070                 if ( rc ) return;
1071         } else {
1072                 e = op->ora_e;
1073         }
1074
1075         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1076                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1077                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1078                 opc->sreference = is_entry_referral( e );
1079                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1080                 if ( a )
1081                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1082         } else if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1083                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1084                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1085                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1086                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1087         }
1088
1089         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1090         for (ss = si->si_ops, sprev = (syncops *)&si->si_ops; ss;
1091                 sprev = ss, ss=snext)
1092         {
1093                 syncmatches *sm;
1094                 int found = 0;
1095
1096                 snext = ss->s_next;
1097                 /* validate base */
1098                 fc.fss = ss;
1099                 fc.fbase = 0;
1100                 fc.fscope = 0;
1101
1102                 /* If the base of the search is missing, signal a refresh */
1103                 rc = syncprov_findbase( op, &fc );
1104                 if ( rc != LDAP_SUCCESS ) {
1105                         SlapReply rs = {REP_RESULT};
1106                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1107                                 "search base has changed" );
1108                         sprev->s_next = snext;
1109                         syncprov_drop_psearch( ss, 1 );
1110                         ss = sprev;
1111                         continue;
1112                 }
1113
1114
1115                 /* If we're sending results now, look for this op in old matches */
1116                 if ( !saveit ) {
1117                         syncmatches *old;
1118
1119                         /* Did we modify the search base? */
1120                         if ( dn_match( &op->o_req_ndn, &ss->s_base )) {
1121                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1122                                 ss->s_flags |= PS_WROTE_BASE;
1123                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1124                         }
1125
1126                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1127                                 old=sm, sm=sm->sm_next ) {
1128                                 if ( sm->sm_op == ss ) {
1129                                         found = 1;
1130                                         old->sm_next = sm->sm_next;
1131                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1132                                         break;
1133                                 }
1134                         }
1135                 }
1136
1137                 /* check if current o_req_dn is in scope and matches filter */
1138                 if ( fc.fscope && test_filter( op, e, ss->s_op->ors_filter ) ==
1139                         LDAP_COMPARE_TRUE ) {
1140                         if ( saveit ) {
1141                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1142                                 sm->sm_next = opc->smatches;
1143                                 sm->sm_op = ss;
1144                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1145                                 ++ss->s_inuse;
1146                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1147                                 opc->smatches = sm;
1148                         } else {
1149                                 /* if found send UPDATE else send ADD */
1150                                 syncprov_qresp( opc, ss,
1151                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD );
1152                         }
1153                 } else if ( !saveit && found ) {
1154                         /* send DELETE */
1155                         syncprov_qresp( opc, ss, LDAP_SYNC_DELETE );
1156                 }
1157         }
1158         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1159
1160         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1161                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
1162                 be_entry_release_rw( op, e, 0 );
1163                 op->o_bd->bd_info = (BackendInfo *)on;
1164         }
1165         if ( freefdn ) {
1166                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1167         }
1168 }
1169
1170 static int
1171 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1172 {
1173         slap_callback *cb = op->o_callback;
1174         opcookie *opc = cb->sc_private;
1175         slap_overinst *on = opc->son;
1176         syncprov_info_t         *si = on->on_bi.bi_private;
1177         syncmatches *sm, *snext;
1178         modtarget *mt, mtdummy;
1179
1180         for (sm = opc->smatches; sm; sm=snext) {
1181                 snext = sm->sm_next;
1182                 syncprov_free_syncop( sm->sm_op );
1183                 op->o_tmpfree( sm, op->o_tmpmemctx );
1184         }
1185
1186         /* Remove op from lock table */
1187         mtdummy.mt_op = op;
1188         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1189         mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1190         if ( mt ) {
1191                 modinst *mi = mt->mt_mods;
1192
1193                 /* If there are more, promote the next one */
1194                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1195                 if ( mi->mi_next ) {
1196                         mt->mt_mods = mi->mi_next;
1197                         mt->mt_op = mt->mt_mods->mi_op;
1198                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1199                 } else {
1200                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1201                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1202                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1203                         ch_free( mt );
1204                 }
1205         }
1206         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1207         if ( !BER_BVISNULL( &opc->suuid ))
1208                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1209         if ( !BER_BVISNULL( &opc->sndn ))
1210                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1211         if ( !BER_BVISNULL( &opc->sdn ))
1212                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1213         op->o_callback = cb->sc_next;
1214         op->o_tmpfree(cb, op->o_tmpmemctx);
1215
1216         return 0;
1217 }
1218
1219 static void
1220 syncprov_checkpoint( Operation *op, SlapReply *rs, slap_overinst *on )
1221 {
1222         syncprov_info_t         *si = on->on_bi.bi_private;
1223         Modifications mod;
1224         Operation opm;
1225         struct berval bv[2];
1226         slap_callback cb = {0};
1227
1228         mod.sml_values = bv;
1229         bv[1].bv_val = NULL;
1230         bv[0] = si->si_ctxcsn;
1231         mod.sml_nvalues = NULL;
1232         mod.sml_desc = slap_schema.si_ad_contextCSN;
1233         mod.sml_op = LDAP_MOD_REPLACE;
1234         mod.sml_flags = 0;
1235         mod.sml_next = NULL;
1236
1237         cb.sc_response = slap_null_cb;
1238         opm = *op;
1239         opm.o_tag = LDAP_REQ_MODIFY;
1240         opm.o_callback = &cb;
1241         opm.orm_modlist = &mod;
1242         opm.o_req_dn = op->o_bd->be_suffix[0];
1243         opm.o_req_ndn = op->o_bd->be_nsuffix[0];
1244         opm.o_bd->bd_info = on->on_info->oi_orig;
1245         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1246         opm.o_bd->be_modify( &opm, rs );
1247         if ( mod.sml_next != NULL ) {
1248                 slap_mods_free( mod.sml_next, 1 );
1249         }
1250 }
1251
1252 static void
1253 syncprov_add_slog( Operation *op, struct berval *csn )
1254 {
1255         opcookie *opc = op->o_callback->sc_private;
1256         slap_overinst *on = opc->son;
1257         syncprov_info_t         *si = on->on_bi.bi_private;
1258         sessionlog *sl;
1259         slog_entry *se;
1260
1261         sl = si->si_logs;
1262         {
1263                 /* Allocate a record. UUIDs are not NUL-terminated. */
1264                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1265                         csn->bv_len + 1 );
1266                 se->se_next = NULL;
1267                 se->se_tag = op->o_tag;
1268
1269                 se->se_uuid.bv_val = (char *)(se+1);
1270                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1271                 se->se_uuid.bv_len = opc->suuid.bv_len;
1272
1273                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1274                 AC_MEMCPY( se->se_csn.bv_val, csn->bv_val, csn->bv_len );
1275                 se->se_csn.bv_val[csn->bv_len] = '\0';
1276                 se->se_csn.bv_len = csn->bv_len;
1277
1278                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1279                 if ( sl->sl_head ) {
1280                         sl->sl_tail->se_next = se;
1281                 } else {
1282                         sl->sl_head = se;
1283                 }
1284                 sl->sl_tail = se;
1285                 sl->sl_num++;
1286                 while ( sl->sl_num > sl->sl_size ) {
1287                         se = sl->sl_head;
1288                         sl->sl_head = se->se_next;
1289                         strcpy( sl->sl_mincsn.bv_val, se->se_csn.bv_val );
1290                         sl->sl_mincsn.bv_len = se->se_csn.bv_len;
1291                         ch_free( se );
1292                         sl->sl_num--;
1293                         if ( !sl->sl_head ) {
1294                                 sl->sl_tail = NULL;
1295                         }
1296                 }
1297                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1298         }
1299 }
1300
1301 /* Just set a flag if we found the matching entry */
1302 static int
1303 playlog_cb( Operation *op, SlapReply *rs )
1304 {
1305         if ( rs->sr_type == REP_SEARCH ) {
1306                 op->o_callback->sc_private = (void *)1;
1307         }
1308         return rs->sr_err;
1309 }
1310
1311 /* enter with sl->sl_mutex locked, release before returning */
1312 static void
1313 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1314         struct berval *oldcsn, struct berval *ctxcsn )
1315 {
1316         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1317         slog_entry *se;
1318         int i, j, ndel, num, nmods, mmods;
1319         BerVarray uuids;
1320
1321         if ( !sl->sl_num ) {
1322                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1323                 return;
1324         }
1325
1326         num = sl->sl_num;
1327         i = 0;
1328         nmods = 0;
1329
1330         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1331                 num * UUID_LEN, op->o_tmpmemctx );
1332
1333         uuids[0].bv_val = (char *)(uuids + num + 1);
1334
1335         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1336          * and everything else at the end. Do this first so we can
1337          * unlock the list mutex.
1338          */
1339         for ( se=sl->sl_head; se; se=se->se_next ) {
1340                 if ( ber_bvcmp( &se->se_csn, oldcsn ) < 0 ) continue;
1341                 if ( ber_bvcmp( &se->se_csn, ctxcsn ) > 0 ) break;
1342                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1343                         j = i;
1344                         i++;
1345                 } else {
1346                         nmods++;
1347                         j = num - nmods;
1348                 }
1349                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1350                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1351                 uuids[j].bv_len = UUID_LEN;
1352         }
1353         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1354
1355         ndel = i;
1356
1357         /* Zero out unused slots */
1358         for ( i=ndel; i < num - nmods; i++ )
1359                 uuids[i].bv_len = 0;
1360
1361         /* Mods must be validated to see if they belong in this delete set.
1362          */
1363
1364         mmods = nmods;
1365         /* Strip any duplicates */
1366         for ( i=0; i<nmods; i++ ) {
1367                 for ( j=0; j<ndel; j++ ) {
1368                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1369                                 uuids[num - 1 - i].bv_len = 0;
1370                                 mmods --;
1371                                 break;
1372                         }
1373                 }
1374                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1375                 for ( j=0; j<i; j++ ) {
1376                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1377                                 uuids[num - 1 - i].bv_len = 0;
1378                                 mmods --;
1379                                 break;
1380                         }
1381                 }
1382         }
1383
1384         if ( mmods ) {
1385                 Operation fop;
1386                 SlapReply frs = { REP_RESULT };
1387                 int rc;
1388                 Filter mf, af;
1389 #ifdef LDAP_COMP_MATCH
1390                 AttributeAssertion eq = { NULL, BER_BVNULL, NULL };
1391 #else
1392                 AttributeAssertion eq;
1393 #endif
1394                 slap_callback cb = {0};
1395
1396                 fop = *op;
1397
1398                 fop.o_sync_mode = 0;
1399                 fop.o_callback = &cb;
1400                 fop.ors_limit = NULL;
1401                 fop.ors_tlimit = SLAP_NO_LIMIT;
1402                 fop.ors_attrs = slap_anlist_all_attributes;
1403                 fop.ors_attrsonly = 0;
1404                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1405
1406                 af.f_choice = LDAP_FILTER_AND;
1407                 af.f_next = NULL;
1408                 af.f_and = &mf;
1409                 mf.f_choice = LDAP_FILTER_EQUALITY;
1410                 mf.f_ava = &eq;
1411                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1412                 mf.f_next = fop.ors_filter;
1413
1414                 fop.ors_filter = &af;
1415
1416                 cb.sc_response = playlog_cb;
1417                 fop.o_bd->bd_info = on->on_info->oi_orig;
1418
1419                 for ( i=ndel; i<num; i++ ) {
1420                         if ( uuids[i].bv_len == 0 ) continue;
1421
1422                         mf.f_av_value = uuids[i];
1423                         cb.sc_private = NULL;
1424                         fop.ors_slimit = 1;
1425                         rc = fop.o_bd->be_search( &fop, &frs );
1426
1427                         /* If entry was not found, add to delete list */
1428                         if ( !cb.sc_private ) {
1429                                 uuids[ndel++] = uuids[i];
1430                         }
1431                 }
1432                 fop.o_bd->bd_info = (BackendInfo *)on;
1433         }
1434         if ( ndel ) {
1435                 uuids[ndel].bv_val = NULL;
1436                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL, 0, uuids, 1 );
1437         }
1438 }
1439
1440 static int
1441 syncprov_op_response( Operation *op, SlapReply *rs )
1442 {
1443         opcookie *opc = op->o_callback->sc_private;
1444         slap_overinst *on = opc->son;
1445         syncprov_info_t         *si = on->on_bi.bi_private;
1446         syncmatches *sm;
1447
1448         if ( rs->sr_err == LDAP_SUCCESS )
1449         {
1450                 struct berval maxcsn = BER_BVNULL, curcsn = BER_BVNULL;
1451                 char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1452
1453                 /* Update our context CSN */
1454                 cbuf[0] = '\0';
1455                 ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1456                 slap_get_commit_csn( op, &maxcsn, &curcsn );
1457                 if ( !BER_BVISNULL( &maxcsn ) ) {
1458                         strcpy( cbuf, maxcsn.bv_val );
1459                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn ) > 0 ) {
1460                                 strcpy( si->si_ctxcsnbuf, cbuf );
1461                                 si->si_ctxcsn.bv_len = maxcsn.bv_len;
1462                         }
1463                 }
1464
1465                 /* Don't do any processing for consumer contextCSN updates */
1466                 if ( SLAP_SYNC_SHADOW( op->o_bd ) &&
1467                         op->o_msgid == SLAP_SYNC_UPDATE_MSGID ) {
1468                         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1469                         return SLAP_CB_CONTINUE;
1470                 }
1471
1472                 si->si_numops++;
1473                 if ( si->si_chkops || si->si_chktime ) {
1474                         int do_check=0;
1475                         if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1476                                 do_check = 1;
1477                                 si->si_numops = 0;
1478                         }
1479                         if ( si->si_chktime &&
1480                                 (op->o_time - si->si_chklast >= si->si_chktime )) {
1481                                 do_check = 1;
1482                                 si->si_chklast = op->o_time;
1483                         }
1484                         if ( do_check ) {
1485                                 syncprov_checkpoint( op, rs, on );
1486                         }
1487                 }
1488                 ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1489
1490                 opc->sctxcsn.bv_len = maxcsn.bv_len;
1491                 opc->sctxcsn.bv_val = cbuf;
1492
1493                 /* Handle any persistent searches */
1494                 if ( si->si_ops ) {
1495                         switch(op->o_tag) {
1496                         case LDAP_REQ_ADD:
1497                         case LDAP_REQ_MODIFY:
1498                         case LDAP_REQ_MODRDN:
1499                         case LDAP_REQ_EXTENDED:
1500                                 syncprov_matchops( op, opc, 0 );
1501                                 break;
1502                         case LDAP_REQ_DELETE:
1503                                 /* for each match in opc->smatches:
1504                                  *   send DELETE msg
1505                                  */
1506                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1507                                         if ( sm->sm_op->s_op->o_abandon )
1508                                                 continue;
1509                                         syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_DELETE );
1510                                 }
1511                                 break;
1512                         }
1513                 }
1514
1515                 /* Add any log records */
1516                 if ( si->si_logs && op->o_tag != LDAP_REQ_ADD ) {
1517                         syncprov_add_slog( op, &curcsn );
1518                 }
1519
1520         }
1521         return SLAP_CB_CONTINUE;
1522 }
1523
1524 /* We don't use a subentry to store the context CSN any more.
1525  * We expose the current context CSN as an operational attribute
1526  * of the suffix entry.
1527  */
1528 static int
1529 syncprov_op_compare( Operation *op, SlapReply *rs )
1530 {
1531         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1532         syncprov_info_t         *si = on->on_bi.bi_private;
1533         int rc = SLAP_CB_CONTINUE;
1534
1535         if ( dn_match( &op->o_req_ndn, op->o_bd->be_nsuffix ) &&
1536                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1537         {
1538                 Entry e = {0};
1539                 Attribute a = {0};
1540                 struct berval bv[2];
1541
1542                 e.e_name = op->o_bd->be_suffix[0];
1543                 e.e_nname = op->o_bd->be_nsuffix[0];
1544
1545                 BER_BVZERO( &bv[1] );
1546                 bv[0] = si->si_ctxcsn;
1547
1548                 a.a_desc = slap_schema.si_ad_contextCSN;
1549                 a.a_vals = bv;
1550                 a.a_nvals = a.a_vals;
1551
1552                 ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1553
1554                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1555                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1556                 if ( ! rs->sr_err ) {
1557                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1558                         goto return_results;
1559                 }
1560
1561                 if ( get_assert( op ) &&
1562                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
1563                 {
1564                         rs->sr_err = LDAP_ASSERTION_FAILED;
1565                         goto return_results;
1566                 }
1567
1568
1569                 rs->sr_err = LDAP_COMPARE_FALSE;
1570
1571                 if ( value_find_ex( op->oq_compare.rs_ava->aa_desc,
1572                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
1573                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
1574                                 a.a_nvals, &op->oq_compare.rs_ava->aa_value, op->o_tmpmemctx ) == 0 )
1575                 {
1576                         rs->sr_err = LDAP_COMPARE_TRUE;
1577                 }
1578
1579 return_results:;
1580
1581                 ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1582
1583                 send_ldap_result( op, rs );
1584
1585                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
1586                         rs->sr_err = LDAP_SUCCESS;
1587                 }
1588                 rc = rs->sr_err;
1589         }
1590
1591         return rc;
1592 }
1593
1594 static int
1595 syncprov_op_mod( Operation *op, SlapReply *rs )
1596 {
1597         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1598         syncprov_info_t         *si = on->on_bi.bi_private;
1599
1600         slap_callback *cb = op->o_tmpcalloc(1, sizeof(slap_callback)+
1601                 sizeof(opcookie) +
1602                 (si->si_ops ? sizeof(modinst) : 0 ),
1603                 op->o_tmpmemctx);
1604         opcookie *opc = (opcookie *)(cb+1);
1605         opc->son = on;
1606         cb->sc_response = syncprov_op_response;
1607         cb->sc_cleanup = syncprov_op_cleanup;
1608         cb->sc_private = opc;
1609         cb->sc_next = op->o_callback;
1610         op->o_callback = cb;
1611
1612         /* If there are active persistent searches, lock this operation.
1613          * See seqmod.c for the locking logic on its own.
1614          */
1615         if ( si->si_ops ) {
1616                 modtarget *mt, mtdummy;
1617                 modinst *mi;
1618
1619                 mi = (modinst *)(opc+1);
1620                 mi->mi_op = op;
1621
1622                 /* See if we're already modifying this entry... */
1623                 mtdummy.mt_op = op;
1624                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1625                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1626                 if ( mt ) {
1627                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1628                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1629                         mt->mt_tail->mi_next = mi;
1630                         mt->mt_tail = mi;
1631                         /* wait for this op to get to head of list */
1632                         while ( mt->mt_mods != mi ) {
1633                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1634                                 ldap_pvt_thread_yield();
1635                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1636
1637                                 /* clean up if the caller is giving up */
1638                                 if ( op->o_abandon ) {
1639                                         modinst *m2;
1640                                         for ( m2 = mt->mt_mods; m2->mi_next != mi;
1641                                                 m2 = m2->mi_next );
1642                                         m2->mi_next = mi->mi_next;
1643                                         if ( mt->mt_tail == mi ) mt->mt_tail = m2;
1644                                         op->o_tmpfree( cb, op->o_tmpmemctx );
1645                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1646                                         return SLAPD_ABANDON;
1647                                 }
1648                         }
1649                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1650                 } else {
1651                         /* Record that we're modifying this entry now */
1652                         mt = ch_malloc( sizeof(modtarget) );
1653                         mt->mt_mods = mi;
1654                         mt->mt_tail = mi;
1655                         mt->mt_op = mi->mi_op;
1656                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
1657                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
1658                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1659                 }
1660         }
1661
1662         if (( si->si_ops || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
1663                 syncprov_matchops( op, opc, 1 );
1664
1665         return SLAP_CB_CONTINUE;
1666 }
1667
1668 static int
1669 syncprov_op_extended( Operation *op, SlapReply *rs )
1670 {
1671         if ( exop_is_write( op ))
1672                 return syncprov_op_mod( op, rs );
1673
1674         return SLAP_CB_CONTINUE;
1675 }
1676
1677 typedef struct searchstate {
1678         slap_overinst *ss_on;
1679         syncops *ss_so;
1680         int ss_present;
1681         struct berval ss_ctxcsn;
1682         char ss_csnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1683 } searchstate;
1684
1685 static int
1686 syncprov_search_cleanup( Operation *op, SlapReply *rs )
1687 {
1688         if ( rs->sr_ctrls ) {
1689                 op->o_tmpfree( rs->sr_ctrls[0], op->o_tmpmemctx );
1690                 op->o_tmpfree( rs->sr_ctrls, op->o_tmpmemctx );
1691                 rs->sr_ctrls = NULL;
1692         }
1693         return 0;
1694 }
1695
1696 static void
1697 syncprov_detach_op( Operation *op, syncops *so, slap_overinst *on )
1698 {
1699         Operation *op2;
1700         int i, alen = 0;
1701         size_t size;
1702         char *ptr;
1703         GroupAssertion *g1, *g2;
1704
1705         /* count the search attrs */
1706         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1707                 alen += op->ors_attrs[i].an_name.bv_len + 1;
1708         }
1709         /* Make a new copy of the operation */
1710         size = sizeof(Operation) + sizeof(Opheader) +
1711                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
1712                 op->o_req_dn.bv_len + 1 +
1713                 op->o_req_ndn.bv_len + 1 +
1714                 op->o_ndn.bv_len + 1 +
1715                 so->s_filterstr.bv_len + 1;
1716         op2 = (Operation *)ch_calloc( 1, size );
1717         op2->o_hdr = (Opheader *)(op2+1);
1718
1719         /* Copy the fields we care about explicitly, leave the rest alone */
1720         *op2->o_hdr = *op->o_hdr;
1721         op2->o_tag = op->o_tag;
1722         op2->o_time = op->o_time;
1723         op2->o_bd = on->on_info->oi_origdb;
1724         op2->o_request = op->o_request;
1725         op2->o_private = on;
1726
1727         if ( i ) {
1728                 op2->ors_attrs = (AttributeName *)(op2->o_hdr + 1);
1729                 ptr = (char *)(op2->ors_attrs+i+1);
1730                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1731                         op2->ors_attrs[i] = op->ors_attrs[i];
1732                         op2->ors_attrs[i].an_name.bv_val = ptr;
1733                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
1734                 }
1735                 BER_BVZERO( &op2->ors_attrs[i].an_name );
1736         } else {
1737                 ptr = (char *)(op2->o_hdr + 1);
1738         }
1739         op2->o_authz = op->o_authz;
1740         op2->o_ndn.bv_val = ptr;
1741         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
1742         op2->o_dn = op2->o_ndn;
1743         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
1744         op2->o_req_dn.bv_val = ptr;
1745         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
1746         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
1747         op2->o_req_ndn.bv_val = ptr;
1748         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
1749         op2->ors_filterstr.bv_val = ptr;
1750         strcpy( ptr, so->s_filterstr.bv_val );
1751         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
1752         op2->ors_filter = str2filter( ptr );
1753         so->s_op = op2;
1754
1755         /* Copy any cached group ACLs individually */
1756         op2->o_groups = NULL;
1757         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
1758                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
1759                 *g2 = *g1;
1760                 strcpy( g2->ga_ndn, g1->ga_ndn );
1761                 g2->ga_next = op2->o_groups;
1762                 op2->o_groups = g2;
1763         }
1764         /* Don't allow any further group caching */
1765         op2->o_do_not_cache = 1;
1766
1767         /* Add op2 to conn so abandon will find us */
1768         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
1769         op->o_conn->c_n_ops_executing++;
1770         op->o_conn->c_n_ops_completed--;
1771         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
1772         so->s_flags |= PS_IS_DETACHED;
1773         ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
1774 }
1775
1776 static int
1777 syncprov_search_response( Operation *op, SlapReply *rs )
1778 {
1779         searchstate *ss = op->o_callback->sc_private;
1780         slap_overinst *on = ss->ss_on;
1781         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
1782
1783         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
1784                 Attribute *a;
1785                 /* If we got a referral without a referral object, there's
1786                  * something missing that we cannot replicate. Just ignore it.
1787                  * The consumer will abort because we didn't send the expected
1788                  * control.
1789                  */
1790                 if ( !rs->sr_entry ) {
1791                         assert( rs->sr_entry != NULL );
1792                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
1793                         return SLAP_CB_CONTINUE;
1794                 }
1795                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryCSN );
1796                 if ( a ) {
1797                         /* Make sure entry is less than the snaphot'd contextCSN */
1798                         if ( ber_bvcmp( &a->a_nvals[0], &ss->ss_ctxcsn ) > 0 )
1799                                 return LDAP_SUCCESS;
1800
1801                         /* Don't send the ctx entry twice */
1802                         if ( !BER_BVISNULL( &srs->sr_state.ctxcsn ) &&
1803                                 bvmatch( &a->a_nvals[0], &srs->sr_state.ctxcsn ) )
1804                                 return LDAP_SUCCESS;
1805                 }
1806                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1807                         op->o_tmpmemctx );
1808                 rs->sr_ctrls[1] = NULL;
1809                 rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
1810                         LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
1811         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
1812                 struct berval cookie;
1813
1814                 slap_compose_sync_cookie( op, &cookie, &ss->ss_ctxcsn,
1815                         srs->sr_state.rid );
1816
1817                 /* Is this a regular refresh? */
1818                 if ( !ss->ss_so ) {
1819                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1820                                 op->o_tmpmemctx );
1821                         rs->sr_ctrls[1] = NULL;
1822                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
1823                                 0, 1, &cookie, ss->ss_present ?  LDAP_SYNC_REFRESH_PRESENTS :
1824                                         LDAP_SYNC_REFRESH_DELETES );
1825                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1826                 } else {
1827                 /* It's RefreshAndPersist, transition to Persist phase */
1828                         syncprov_sendinfo( op, rs, ( ss->ss_present && rs->sr_nentries ) ?
1829                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
1830                                 &cookie, 1, NULL, 0 );
1831                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1832
1833                         /* Detach this Op from frontend control */
1834                         ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
1835
1836                         /* Turn off the refreshing flag */
1837                         ss->ss_so->s_flags ^= PS_IS_REFRESHING;
1838
1839                         syncprov_detach_op( op, ss->ss_so, on );
1840                         ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
1841
1842                         return LDAP_SUCCESS;
1843                 }
1844         }
1845
1846         return SLAP_CB_CONTINUE;
1847 }
1848
1849 static int
1850 syncprov_op_search( Operation *op, SlapReply *rs )
1851 {
1852         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1853         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
1854         slap_callback   *cb;
1855         int gotstate = 0, nochange = 0, do_present;
1856         syncops *sop = NULL;
1857         searchstate *ss;
1858         sync_control *srs;
1859         struct berval ctxcsn;
1860         char csnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1861
1862         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
1863
1864         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
1865                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
1866                 return rs->sr_err;
1867         }
1868
1869         do_present = si->si_nopres ? 0 : 1;
1870
1871         srs = op->o_controls[slap_cids.sc_LDAPsync];
1872         op->o_managedsait = SLAP_CONTROL_NONCRITICAL;
1873
1874         /* If this is a persistent search, set it up right away */
1875         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
1876                 syncops so = {0};
1877                 fbase_cookie fc;
1878                 opcookie opc;
1879                 slap_callback sc;
1880
1881                 fc.fss = &so;
1882                 fc.fbase = 0;
1883                 so.s_eid = NOID;
1884                 so.s_op = op;
1885                 so.s_flags = PS_IS_REFRESHING | PS_FIND_BASE;
1886                 /* syncprov_findbase expects to be called as a callback... */
1887                 sc.sc_private = &opc;
1888                 opc.son = on;
1889                 cb = op->o_callback;
1890                 op->o_callback = &sc;
1891                 rs->sr_err = syncprov_findbase( op, &fc );
1892                 op->o_callback = cb;
1893
1894                 if ( rs->sr_err != LDAP_SUCCESS ) {
1895                         send_ldap_result( op, rs );
1896                         return rs->sr_err;
1897                 }
1898                 sop = ch_malloc( sizeof( syncops ));
1899                 *sop = so;
1900                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
1901                 sop->s_rid = srs->sr_state.rid;
1902                 sop->s_inuse = 1;
1903
1904                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1905                 sop->s_next = si->si_ops;
1906                 si->si_ops = sop;
1907                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1908         }
1909
1910         /* snapshot the ctxcsn */
1911         ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1912         strcpy( csnbuf, si->si_ctxcsnbuf );
1913         ctxcsn.bv_len = si->si_ctxcsn.bv_len;
1914         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1915         ctxcsn.bv_val = csnbuf;
1916
1917         /* If we have a cookie, handle the PRESENT lookups */
1918         if ( !BER_BVISNULL( &srs->sr_state.ctxcsn )) {
1919                 sessionlog *sl;
1920
1921                 /* The cookie was validated when it was parsed, just use it */
1922
1923                 /* If just Refreshing and nothing has changed, shortcut it */
1924                 if ( bvmatch( &srs->sr_state.ctxcsn, &ctxcsn )) {
1925                         nochange = 1;
1926                         if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
1927                                 LDAPControl     *ctrls[2];
1928
1929                                 ctrls[0] = NULL;
1930                                 ctrls[1] = NULL;
1931                                 syncprov_done_ctrl( op, rs, ctrls, 0, 0,
1932                                         NULL, LDAP_SYNC_REFRESH_DELETES );
1933                                 rs->sr_ctrls = ctrls;
1934                                 rs->sr_err = LDAP_SUCCESS;
1935                                 send_ldap_result( op, rs );
1936                                 rs->sr_ctrls = NULL;
1937                                 return rs->sr_err;
1938                         }
1939                         goto shortcut;
1940                 }
1941                 /* Do we have a sessionlog for this search? */
1942                 sl=si->si_logs;
1943                 if ( sl ) {
1944                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1945                         if ( ber_bvcmp( &srs->sr_state.ctxcsn, &sl->sl_mincsn ) >= 0 ) {
1946                                 do_present = 0;
1947                                 /* mutex is unlocked in playlog */
1948                                 syncprov_playlog( op, rs, sl, &srs->sr_state.ctxcsn, &ctxcsn );
1949                         } else {
1950                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1951                         }
1952                 }
1953                 /* Is the CSN still present in the database? */
1954                 if ( syncprov_findcsn( op, FIND_CSN ) != LDAP_SUCCESS ) {
1955                         /* No, so a reload is required */
1956                         /* the 2.2 consumer doesn't send this hint */
1957                         if ( si->si_usehint && srs->sr_rhint == 0 ) {
1958                                 send_ldap_error( op, rs, LDAP_SYNC_REFRESH_REQUIRED, "sync cookie is stale" );
1959                                 return rs->sr_err;
1960                         }
1961                 } else {
1962                         gotstate = 1;
1963                         /* If changed and doing Present lookup, send Present UUIDs */
1964                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT ) !=
1965                                 LDAP_SUCCESS ) {
1966                                 send_ldap_result( op, rs );
1967                                 return rs->sr_err;
1968                         }
1969                 }
1970         }
1971
1972 shortcut:
1973         /* Append CSN range to search filter, save original filter
1974          * for persistent search evaluation
1975          */
1976         if ( sop ) {
1977                 sop->s_filterstr= op->ors_filterstr;
1978         }
1979
1980         /* If something changed, find the changes */
1981         if ( gotstate && !nochange ) {
1982                 Filter *fand, *fava;
1983
1984                 fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
1985                 fand->f_choice = LDAP_FILTER_AND;
1986                 fand->f_next = NULL;
1987                 fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
1988                 fand->f_and = fava;
1989                 fava->f_choice = LDAP_FILTER_GE;
1990                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
1991                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
1992 #ifdef LDAP_COMP_MATCH
1993                 fava->f_ava->aa_cf = NULL;
1994 #endif
1995                 ber_dupbv_x( &fava->f_ava->aa_value, &srs->sr_state.ctxcsn, op->o_tmpmemctx );
1996                 fava->f_next = op->ors_filter;
1997                 op->ors_filter = fand;
1998                 filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
1999         }
2000
2001         /* Let our callback add needed info to returned entries */
2002         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
2003         ss = (searchstate *)(cb+1);
2004         ss->ss_on = on;
2005         ss->ss_so = sop;
2006         ss->ss_present = do_present;
2007         ss->ss_ctxcsn.bv_len = ctxcsn.bv_len;
2008         ss->ss_ctxcsn.bv_val = ss->ss_csnbuf;
2009         strcpy( ss->ss_ctxcsn.bv_val, ctxcsn.bv_val );
2010         cb->sc_response = syncprov_search_response;
2011         cb->sc_cleanup = syncprov_search_cleanup;
2012         cb->sc_private = ss;
2013         cb->sc_next = op->o_callback;
2014         op->o_callback = cb;
2015
2016 #if 0   /* I don't think we need to shortcircuit back-bdb any more */
2017         op->o_sync_mode &= SLAP_CONTROL_MASK;
2018 #endif
2019
2020         /* If this is a persistent search and no changes were reported during
2021          * the refresh phase, just invoke the response callback to transition
2022          * us into persist phase
2023          */
2024         if ( nochange ) {
2025                 rs->sr_err = LDAP_SUCCESS;
2026                 rs->sr_nentries = 0;
2027                 send_ldap_result( op, rs );
2028                 return rs->sr_err;
2029         }
2030         return SLAP_CB_CONTINUE;
2031 }
2032
2033 static int
2034 syncprov_operational(
2035         Operation *op,
2036         SlapReply *rs )
2037 {
2038         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2039         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2040
2041         if ( rs->sr_entry &&
2042                 dn_match( &rs->sr_entry->e_nname, op->o_bd->be_nsuffix )) {
2043
2044                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
2045                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
2046                         Attribute *a, **ap = NULL;
2047
2048                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
2049                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
2050                                         break;
2051                         }
2052
2053                         if ( !a ) {
2054                                 for ( ap = &rs->sr_operational_attrs; *ap; ap=&(*ap)->a_next );
2055
2056                                 a = ch_malloc( sizeof(Attribute));
2057                                 a->a_desc = slap_schema.si_ad_contextCSN;
2058                                 a->a_vals = ch_malloc( 2 * sizeof(struct berval));
2059                                 a->a_vals[1].bv_val = NULL;
2060                                 a->a_nvals = a->a_vals;
2061                                 a->a_next = NULL;
2062                                 a->a_flags = 0;
2063                                 *ap = a;
2064                         }
2065
2066                         ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
2067                         if ( !ap ) {
2068                                 strcpy( a->a_vals[0].bv_val, si->si_ctxcsnbuf );
2069                         } else {
2070                                 ber_dupbv( &a->a_vals[0], &si->si_ctxcsn );
2071                         }
2072                         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
2073                 }
2074         }
2075         return SLAP_CB_CONTINUE;
2076 }
2077
2078 enum {
2079         SP_CHKPT = 1,
2080         SP_SESSL,
2081         SP_NOPRES,
2082         SP_USEHINT
2083 };
2084
2085 static ConfigDriver sp_cf_gen;
2086
2087 static ConfigTable spcfg[] = {
2088         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2089                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2090                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2091                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2092         { "syncprov-sessionlog", "ops", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2093                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2094                         "DESC 'Session log size in ops' "
2095                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2096         { "syncprov-nopresent", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_NOPRES,
2097                 sp_cf_gen, "( OLcfgOvAt:1.3 NAME 'olcSpNoPresent' "
2098                         "DESC 'Omit Present phase processing' "
2099                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2100         { "syncprov-reloadhint", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_USEHINT,
2101                 sp_cf_gen, "( OLcfgOvAt:1.4 NAME 'olcSpReloadHint' "
2102                         "DESC 'Observe Reload Hint in Request control' "
2103                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2104         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2105 };
2106
2107 static ConfigOCs spocs[] = {
2108         { "( OLcfgOvOc:1.1 "
2109                 "NAME 'olcSyncProvConfig' "
2110                 "DESC 'SyncRepl Provider configuration' "
2111                 "SUP olcOverlayConfig "
2112                 "MAY ( olcSpCheckpoint $ olcSpSessionlog $ olcSpNoPresent ) )",
2113                         Cft_Overlay, spcfg },
2114         { NULL, 0, NULL }
2115 };
2116
2117 static int
2118 sp_cf_gen(ConfigArgs *c)
2119 {
2120         slap_overinst           *on = (slap_overinst *)c->bi;
2121         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2122         int rc = 0;
2123
2124         if ( c->op == SLAP_CONFIG_EMIT ) {
2125                 switch ( c->type ) {
2126                 case SP_CHKPT:
2127                         if ( si->si_chkops || si->si_chktime ) {
2128                                 struct berval bv;
2129                                 bv.bv_len = sprintf( c->msg, "%d %d",
2130                                         si->si_chkops, si->si_chktime );
2131                                 bv.bv_val = c->msg;
2132                                 value_add_one( &c->rvalue_vals, &bv );
2133                         } else {
2134                                 rc = 1;
2135                         }
2136                         break;
2137                 case SP_SESSL:
2138                         if ( si->si_logs ) {
2139                                 c->value_int = si->si_logs->sl_size;
2140                         } else {
2141                                 rc = 1;
2142                         }
2143                         break;
2144                 case SP_NOPRES:
2145                         if ( si->si_nopres ) {
2146                                 c->value_int = 1;
2147                         } else {
2148                                 rc = 1;
2149                         }
2150                         break;
2151                 case SP_USEHINT:
2152                         if ( si->si_usehint ) {
2153                                 c->value_int = 1;
2154                         } else {
2155                                 rc = 1;
2156                         }
2157                         break;
2158                 }
2159                 return rc;
2160         } else if ( c->op == LDAP_MOD_DELETE ) {
2161                 switch ( c->type ) {
2162                 case SP_CHKPT:
2163                         si->si_chkops = 0;
2164                         si->si_chktime = 0;
2165                         break;
2166                 case SP_SESSL:
2167                         if ( si->si_logs )
2168                                 si->si_logs->sl_size = 0;
2169                         else
2170                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2171                         break;
2172                 case SP_NOPRES:
2173                         if ( si->si_nopres )
2174                                 si->si_nopres = 0;
2175                         else
2176                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2177                         break;
2178                 case SP_USEHINT:
2179                         if ( si->si_usehint )
2180                                 si->si_usehint = 0;
2181                         else
2182                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2183                         break;
2184                 }
2185                 return rc;
2186         }
2187         switch ( c->type ) {
2188         case SP_CHKPT:
2189                 si->si_chkops = atoi( c->argv[1] );
2190                 si->si_chktime = atoi( c->argv[2] ) * 60;
2191                 break;
2192         case SP_SESSL: {
2193                 sessionlog *sl;
2194                 int size = c->value_int;
2195
2196                 if ( size < 0 ) {
2197                         sprintf( c->msg, "%s size %d is negative",
2198                                 c->argv[0], size );
2199                         Debug( LDAP_DEBUG_CONFIG, "%s: %s\n", c->log, c->msg, 0 );
2200                         return ARG_BAD_CONF;
2201                 }
2202                 sl = si->si_logs;
2203                 if ( !sl ) {
2204                         sl = ch_malloc( sizeof( sessionlog ) + LDAP_LUTIL_CSNSTR_BUFSIZE );
2205                         sl->sl_mincsn.bv_val = (char *)(sl+1);
2206                         sl->sl_mincsn.bv_len = 0;
2207                         sl->sl_num = 0;
2208                         sl->sl_head = sl->sl_tail = NULL;
2209                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
2210                         si->si_logs = sl;
2211                 }
2212                 sl->sl_size = size;
2213                 }
2214                 break;
2215         case SP_NOPRES:
2216                 si->si_nopres = c->value_int;
2217                 break;
2218         case SP_USEHINT:
2219                 si->si_usehint = c->value_int;
2220                 break;
2221         }
2222         return rc;
2223 }
2224
2225 /* ITS#3456 we cannot run this search on the main thread, must use a
2226  * child thread in order to insure we have a big enough stack.
2227  */
2228 static void *
2229 syncprov_db_otask(
2230         void *ptr
2231 )
2232 {
2233         syncprov_findcsn( ptr, FIND_MAXCSN );
2234         return NULL;
2235 }
2236
2237 /* Read any existing contextCSN from the underlying db.
2238  * Then search for any entries newer than that. If no value exists,
2239  * just generate it. Cache whatever result.
2240  */
2241 static int
2242 syncprov_db_open(
2243     BackendDB *be
2244 )
2245 {
2246         slap_overinst   *on = (slap_overinst *) be->bd_info;
2247         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2248
2249         Connection conn;
2250         OperationBuffer opbuf;
2251         char ctxcsnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
2252         Operation *op = (Operation *) &opbuf;
2253         Entry *e;
2254         Attribute *a;
2255         int rc;
2256         void *thrctx = NULL;
2257
2258         if ( slapMode & SLAP_TOOL_MODE ) {
2259                 return 0;
2260         }
2261
2262         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
2263         if ( rc ) {
2264                 return rc;
2265         }
2266
2267         thrctx = ldap_pvt_thread_pool_context();
2268         connection_fake_init( &conn, op, thrctx );
2269         op->o_bd = be;
2270         op->o_dn = be->be_rootdn;
2271         op->o_ndn = be->be_rootndn;
2272
2273         ctxcsnbuf[0] = '\0';
2274
2275         op->o_bd->bd_info = on->on_info->oi_orig;
2276         rc = be_entry_get_rw( op, be->be_nsuffix, NULL,
2277                 slap_schema.si_ad_contextCSN, 0, &e );
2278
2279         if ( e ) {
2280                 ldap_pvt_thread_t tid;
2281
2282                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
2283                 if ( a ) {
2284                         si->si_ctxcsn.bv_len = a->a_nvals[0].bv_len;
2285                         if ( si->si_ctxcsn.bv_len >= sizeof(si->si_ctxcsnbuf ))
2286                                 si->si_ctxcsn.bv_len = sizeof(si->si_ctxcsnbuf)-1;
2287                         strncpy( si->si_ctxcsnbuf, a->a_nvals[0].bv_val,
2288                                 si->si_ctxcsn.bv_len );
2289                         si->si_ctxcsnbuf[si->si_ctxcsn.bv_len] = '\0';
2290                         strcpy( ctxcsnbuf, si->si_ctxcsnbuf );
2291                 }
2292                 be_entry_release_rw( op, e, 0 );
2293                 op->o_bd->bd_info = (BackendInfo *)on;
2294                 op->o_req_dn = be->be_suffix[0];
2295                 op->o_req_ndn = be->be_nsuffix[0];
2296                 op->ors_scope = LDAP_SCOPE_SUBTREE;
2297                 ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
2298                 ldap_pvt_thread_join( tid, NULL );
2299         } else if ( SLAP_SYNC_SHADOW( op->o_bd )) {
2300                 /* If we're also a consumer, and we didn't find the context entry,
2301                  * then don't generate anything, wait for our provider to send it
2302                  * to us.
2303                  */
2304                 goto out;
2305         }
2306
2307         if ( BER_BVISEMPTY( &si->si_ctxcsn ) ) {
2308                 si->si_ctxcsn.bv_len = sizeof( si->si_ctxcsnbuf );
2309                 slap_get_csn( op, &si->si_ctxcsn, 0 );
2310         }
2311
2312         /* If our ctxcsn is different from what was read from the root
2313          * entry, make sure we do a checkpoint on close
2314          */
2315         if ( strcmp( si->si_ctxcsnbuf, ctxcsnbuf )) {
2316                 si->si_numops++;
2317         }
2318
2319 out:
2320         op->o_bd->bd_info = (BackendInfo *)on;
2321         ldap_pvt_thread_pool_context_reset( thrctx );
2322         return 0;
2323 }
2324
2325 /* Write the current contextCSN into the underlying db.
2326  */
2327 static int
2328 syncprov_db_close(
2329     BackendDB *be
2330 )
2331 {
2332     slap_overinst   *on = (slap_overinst *) be->bd_info;
2333     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2334
2335         if ( slapMode & SLAP_TOOL_MODE ) {
2336                 return 0;
2337         }
2338         if ( si->si_numops ) {
2339                 Connection conn;
2340                 OperationBuffer opbuf;
2341                 Operation *op = (Operation *) &opbuf;
2342                 SlapReply rs = {REP_RESULT};
2343                 void *thrctx;
2344
2345                 thrctx = ldap_pvt_thread_pool_context();
2346                 connection_fake_init( &conn, op, thrctx );
2347                 op->o_bd = be;
2348                 op->o_dn = be->be_rootdn;
2349                 op->o_ndn = be->be_rootndn;
2350                 syncprov_checkpoint( op, &rs, on );
2351                 ldap_pvt_thread_pool_context_reset( thrctx );
2352         }
2353
2354     return 0;
2355 }
2356
2357 static int
2358 syncprov_db_init(
2359         BackendDB *be
2360 )
2361 {
2362         slap_overinst   *on = (slap_overinst *)be->bd_info;
2363         syncprov_info_t *si;
2364
2365         si = ch_calloc(1, sizeof(syncprov_info_t));
2366         on->on_bi.bi_private = si;
2367         ldap_pvt_thread_mutex_init( &si->si_csn_mutex );
2368         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
2369         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
2370         si->si_ctxcsn.bv_val = si->si_ctxcsnbuf;
2371
2372         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
2373         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
2374         csn_anlist[1].an_desc = slap_schema.si_ad_entryUUID;
2375         csn_anlist[1].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2376
2377         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
2378         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2379
2380         return 0;
2381 }
2382
2383 static int
2384 syncprov_db_destroy(
2385         BackendDB *be
2386 )
2387 {
2388         slap_overinst   *on = (slap_overinst *)be->bd_info;
2389         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2390
2391         if ( si ) {
2392                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
2393                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
2394                 ldap_pvt_thread_mutex_destroy( &si->si_csn_mutex );
2395                 ch_free( si );
2396         }
2397
2398         return 0;
2399 }
2400
2401 static int syncprov_parseCtrl (
2402         Operation *op,
2403         SlapReply *rs,
2404         LDAPControl *ctrl )
2405 {
2406         ber_tag_t tag;
2407         BerElementBuffer berbuf;
2408         BerElement *ber = (BerElement *)&berbuf;
2409         ber_int_t mode;
2410         ber_len_t len;
2411         struct berval cookie = BER_BVNULL;
2412         sync_control *sr;
2413         int rhint = 0;
2414
2415         if ( op->o_sync != SLAP_CONTROL_NONE ) {
2416                 rs->sr_text = "Sync control specified multiple times";
2417                 return LDAP_PROTOCOL_ERROR;
2418         }
2419
2420         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
2421                 rs->sr_text = "Sync control specified with pagedResults control";
2422                 return LDAP_PROTOCOL_ERROR;
2423         }
2424
2425         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
2426                 rs->sr_text = "Sync control value is empty (or absent)";
2427                 return LDAP_PROTOCOL_ERROR;
2428         }
2429
2430         /* Parse the control value
2431          *      syncRequestValue ::= SEQUENCE {
2432          *              mode   ENUMERATED {
2433          *                      -- 0 unused
2434          *                      refreshOnly             (1),
2435          *                      -- 2 reserved
2436          *                      refreshAndPersist       (3)
2437          *              },
2438          *              cookie  syncCookie OPTIONAL
2439          *      }
2440          */
2441
2442         ber_init2( ber, &ctrl->ldctl_value, 0 );
2443
2444         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
2445                 rs->sr_text = "Sync control : mode decoding error";
2446                 return LDAP_PROTOCOL_ERROR;
2447         }
2448
2449         switch( mode ) {
2450         case LDAP_SYNC_REFRESH_ONLY:
2451                 mode = SLAP_SYNC_REFRESH;
2452                 break;
2453         case LDAP_SYNC_REFRESH_AND_PERSIST:
2454                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
2455                 break;
2456         default:
2457                 rs->sr_text = "Sync control : unknown update mode";
2458                 return LDAP_PROTOCOL_ERROR;
2459         }
2460
2461         tag = ber_peek_tag( ber, &len );
2462
2463         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
2464                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
2465                         rs->sr_text = "Sync control : cookie decoding error";
2466                         return LDAP_PROTOCOL_ERROR;
2467                 }
2468                 tag = ber_peek_tag( ber, &len );
2469         }
2470         if ( tag == LDAP_TAG_RELOAD_HINT ) {
2471                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
2472                         rs->sr_text = "Sync control : rhint decoding error";
2473                         return LDAP_PROTOCOL_ERROR;
2474                 }
2475         }
2476         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
2477                         rs->sr_text = "Sync control : decoding error";
2478                         return LDAP_PROTOCOL_ERROR;
2479         }
2480         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
2481         sr->sr_rhint = rhint;
2482         if (!BER_BVISNULL(&cookie)) {
2483                 ber_dupbv_x( &sr->sr_state.octet_str, &cookie, op->o_tmpmemctx );
2484                 slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx );
2485                 if ( sr->sr_state.rid == -1 ) {
2486                         rs->sr_text = "Sync control : cookie parsing error";
2487                         return LDAP_PROTOCOL_ERROR;
2488                 }
2489         }
2490
2491         op->o_controls[slap_cids.sc_LDAPsync] = sr;
2492
2493         op->o_sync = ctrl->ldctl_iscritical
2494                 ? SLAP_CONTROL_CRITICAL
2495                 : SLAP_CONTROL_NONCRITICAL;
2496
2497         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
2498
2499         return LDAP_SUCCESS;
2500 }
2501
2502 /* This overlay is set up for dynamic loading via moduleload. For static
2503  * configuration, you'll need to arrange for the slap_overinst to be
2504  * initialized and registered by some other function inside slapd.
2505  */
2506
2507 static slap_overinst            syncprov;
2508
2509 int
2510 syncprov_init()
2511 {
2512         int rc;
2513
2514         rc = register_supported_control( LDAP_CONTROL_SYNC,
2515                 SLAP_CTRL_HIDE|SLAP_CTRL_SEARCH, NULL,
2516                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
2517         if ( rc != LDAP_SUCCESS ) {
2518                 Debug( LDAP_DEBUG_ANY,
2519                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
2520                 return rc;
2521         }
2522
2523         syncprov.on_bi.bi_type = "syncprov";
2524         syncprov.on_bi.bi_db_init = syncprov_db_init;
2525         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
2526         syncprov.on_bi.bi_db_open = syncprov_db_open;
2527         syncprov.on_bi.bi_db_close = syncprov_db_close;
2528
2529         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
2530         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
2531
2532         syncprov.on_bi.bi_op_add = syncprov_op_mod;
2533         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
2534         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
2535         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
2536         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
2537         syncprov.on_bi.bi_op_search = syncprov_op_search;
2538         syncprov.on_bi.bi_extended = syncprov_op_extended;
2539         syncprov.on_bi.bi_operational = syncprov_operational;
2540
2541         syncprov.on_bi.bi_cf_ocs = spocs;
2542
2543         generic_filter.f_desc = slap_schema.si_ad_objectClass;
2544
2545         rc = config_register_schema( spcfg, spocs );
2546         if ( rc ) return rc;
2547
2548         return overlay_register( &syncprov );
2549 }
2550
2551 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
2552 int
2553 init_module( int argc, char *argv[] )
2554 {
2555         return syncprov_init();
2556 }
2557 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
2558
2559 #endif /* defined(SLAPD_OVER_SYNCPROV) */