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 #define FIND_MAXCSN     1
 487 #define FIND_CSN        2
 488 #define FIND_PRESENT    3
 489
 490 static int
 491 findmax_cb( Operation *op, SlapReply *rs )
 492 {
 493         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 494                 struct berval *maxcsn = op->o_callback->sc_private;
 495                 Attribute *a = attr_find( rs->sr_entry->e_attrs,
 496                         slap_schema.si_ad_entryCSN );
 497
 498                 if ( a && ber_bvcmp( &a->a_vals[0], maxcsn ) > 0 ) {
 499                         maxcsn->bv_len = a->a_vals[0].bv_len;
 500                         strcpy( maxcsn->bv_val, a->a_vals[0].bv_val );
 501                 }
 502         }
 503         return LDAP_SUCCESS;
 504 }
 505
 506 static int
 507 findcsn_cb( Operation *op, SlapReply *rs )
 508 {
 509         slap_callback *sc = op->o_callback;
 510
 511         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 512                 sc->sc_private = (void *)1;
 513         }
 514         return LDAP_SUCCESS;
 515 }
 516
 517 /* Build a list of entryUUIDs for sending in a SyncID set */
 518
 519 #define UUID_LEN        16
 520
 521 typedef struct fpres_cookie {
 522         int num;
 523         BerVarray uuids;
 524         char *last;
 525 } fpres_cookie;
 526
 527 static int
 528 findpres_cb( Operation *op, SlapReply *rs )
 529 {
 530         slap_callback *sc = op->o_callback;
 531         fpres_cookie *pc = sc->sc_private;
 532         Attribute *a;
 533         int ret = SLAP_CB_CONTINUE;
 534
 535         switch ( rs->sr_type ) {
 536         case REP_SEARCH:
 537                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryUUID );
 538                 if ( a ) {
 539                         pc->uuids[pc->num].bv_val = pc->last;
 540                         AC_MEMCPY( pc->uuids[pc->num].bv_val, a->a_nvals[0].bv_val,
 541                                 pc->uuids[pc->num].bv_len );
 542                         pc->num++;
 543                         pc->last = pc->uuids[pc->num].bv_val;
 544                         pc->uuids[pc->num].bv_val = NULL;
 545                 }
 546                 ret = LDAP_SUCCESS;
 547                 if ( pc->num != SLAP_SYNCUUID_SET_SIZE )
 548                         break;
 549                 /* FALLTHRU */
 550         case REP_RESULT:
 551                 ret = rs->sr_err;
 552                 if ( pc->num ) {
 553                         ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 554                                 0, pc->uuids, 0 );
 555                         pc->uuids[pc->num].bv_val = pc->last;
 556                         pc->num = 0;
 557                         pc->last = pc->uuids[0].bv_val;
 558                 }
 559                 break;
 560         default:
 561                 break;
 562         }
 563         return ret;
 564 }
 565
 566 static int
 567 syncprov_findcsn( Operation *op, int mode )
 568 {
 569         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 570         syncprov_info_t         *si = on->on_bi.bi_private;
 571
 572         slap_callback cb = {0};
 573         Operation fop;
 574         SlapReply frs = { REP_RESULT };
 575         char buf[LDAP_LUTIL_CSNSTR_BUFSIZE + STRLENOF("(entryCSN<=)")];
 576         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 577         struct berval maxcsn;
 578         Filter cf, af;
 579 #ifdef LDAP_COMP_MATCH
 580         AttributeAssertion eq = { NULL, BER_BVNULL, NULL };
 581 #else
 582         AttributeAssertion eq = { NULL, BER_BVNULL };
 583 #endif
 584         int i, rc = LDAP_SUCCESS;
 585         fpres_cookie pcookie;
 586         sync_control *srs = NULL;
 587         int findcsn_retry = 1;
 588
 589         if ( mode != FIND_MAXCSN ) {
 590                 srs = op->o_controls[slap_cids.sc_LDAPsync];
 591
 592                 if ( srs->sr_state.ctxcsn.bv_len >= LDAP_LUTIL_CSNSTR_BUFSIZE ) {
 593                         return LDAP_OTHER;
 594                 }
 595         }
 596
 597         fop = *op;
 598         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync_mode */
 599         /* We want pure entries, not referrals */
 600         fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 601
 602         cf.f_ava = &eq;
 603         cf.f_av_desc = slap_schema.si_ad_entryCSN;
 604         cf.f_next = NULL;
 605
 606         fop.o_callback = &cb;
 607         fop.ors_limit = NULL;
 608         fop.ors_tlimit = SLAP_NO_LIMIT;
 609         fop.ors_filter = &cf;
 610         fop.ors_filterstr.bv_val = buf;
 611
 612 again:
 613         switch( mode ) {
 614         case FIND_MAXCSN:
 615                 cf.f_choice = LDAP_FILTER_GE;
 616                 cf.f_av_value = si->si_ctxcsn;
 617                 fop.ors_filterstr.bv_len = sprintf( buf, "(entryCSN>=%s)",
 618                         cf.f_av_value.bv_val );
 619                 fop.ors_attrsonly = 0;
 620                 fop.ors_attrs = csn_anlist;
 621                 fop.ors_slimit = SLAP_NO_LIMIT;
 622                 cb.sc_private = &maxcsn;
 623                 cb.sc_response = findmax_cb;
 624                 strcpy( cbuf, si->si_ctxcsn.bv_val );
 625                 maxcsn.bv_val = cbuf;
 626                 maxcsn.bv_len = si->si_ctxcsn.bv_len;
 627                 break;
 628         case FIND_CSN:
 629                 cf.f_av_value = srs->sr_state.ctxcsn;
 630                 /* Look for exact match the first time */
 631                 if ( findcsn_retry ) {
 632                         cf.f_choice = LDAP_FILTER_EQUALITY;
 633                         fop.ors_filterstr.bv_len = sprintf( buf, "(entryCSN=%s)",
 634                                 cf.f_av_value.bv_val );
 635                 /* On retry, look for <= */
 636                 } else {
 637                         cf.f_choice = LDAP_FILTER_LE;
 638                         fop.ors_filterstr.bv_len = sprintf( buf, "(entryCSN<=%s)",
 639                                 cf.f_av_value.bv_val );
 640                 }
 641                 fop.ors_attrsonly = 1;
 642                 fop.ors_attrs = slap_anlist_no_attrs;
 643                 fop.ors_slimit = 1;
 644                 cb.sc_private = NULL;
 645                 cb.sc_response = findcsn_cb;
 646                 break;
 647         case FIND_PRESENT:
 648                 af.f_choice = LDAP_FILTER_AND;
 649                 af.f_next = NULL;
 650                 af.f_and = &cf;
 651                 cf.f_choice = LDAP_FILTER_LE;
 652                 cf.f_av_value = srs->sr_state.ctxcsn;
 653                 cf.f_next = op->ors_filter;
 654                 fop.ors_filter = &af;
 655                 filter2bv_x( &fop, fop.ors_filter, &fop.ors_filterstr );
 656                 fop.ors_attrsonly = 0;
 657                 fop.ors_attrs = uuid_anlist;
 658                 fop.ors_slimit = SLAP_NO_LIMIT;
 659                 cb.sc_private = &pcookie;
 660                 cb.sc_response = findpres_cb;
 661                 pcookie.num = 0;
 662
 663                 /* preallocate storage for a full set */
 664                 pcookie.uuids = op->o_tmpalloc( (SLAP_SYNCUUID_SET_SIZE+1) *
 665                         sizeof(struct berval) + SLAP_SYNCUUID_SET_SIZE * UUID_LEN,
 666                         op->o_tmpmemctx );
 667                 pcookie.last = (char *)(pcookie.uuids + SLAP_SYNCUUID_SET_SIZE+1);
 668                 pcookie.uuids[0].bv_val = pcookie.last;
 669                 pcookie.uuids[0].bv_len = UUID_LEN;
 670                 for (i=1; i<SLAP_SYNCUUID_SET_SIZE; i++) {
 671                         pcookie.uuids[i].bv_val = pcookie.uuids[i-1].bv_val + UUID_LEN;
 672                         pcookie.uuids[i].bv_len = UUID_LEN;
 673                 }
 674                 break;
 675         }
 676
 677         fop.o_bd->bd_info = on->on_info->oi_orig;
 678         fop.o_bd->be_search( &fop, &frs );
 679         fop.o_bd->bd_info = (BackendInfo *)on;
 680
 681         switch( mode ) {
 682         case FIND_MAXCSN:
 683                 strcpy( si->si_ctxcsnbuf, maxcsn.bv_val );
 684                 si->si_ctxcsn.bv_len = maxcsn.bv_len;
 685                 break;
 686         case FIND_CSN:
 687                 /* If matching CSN was not found, invalidate the context. */
 688                 if ( !cb.sc_private ) {
 689                         /* If we didn't find an exact match, then try for <= */
 690                         if ( findcsn_retry ) {
 691                                 findcsn_retry = 0;
 692                                 goto again;
 693                         }
 694                         rc = LDAP_NO_SUCH_OBJECT;
 695                 }
 696                 break;
 697         case FIND_PRESENT:
 698                 op->o_tmpfree( pcookie.uuids, op->o_tmpmemctx );
 699                 op->o_tmpfree( fop.ors_filterstr.bv_val, op->o_tmpmemctx );
 700                 break;
 701         }
 702
 703         return rc;
 704 }
 705
 706 static void
 707 syncprov_free_syncop( syncops *so )
 708 {
 709         syncres *sr, *srnext;
 710         GroupAssertion *ga, *gnext;
 711
 712         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 713         if ( --so->s_inuse > 0 ) {
 714                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 715                 return;
 716         }
 717         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 718         if ( so->s_flags & PS_IS_DETACHED ) {
 719                 filter_free( so->s_op->ors_filter );
 720                 for ( ga = so->s_op->o_groups; ga; ga=gnext ) {
 721                         gnext = ga->ga_next;
 722                         ch_free( ga );
 723                 }
 724                 ch_free( so->s_op );
 725         }
 726         ch_free( so->s_base.bv_val );
 727         for ( sr=so->s_res; sr; sr=srnext ) {
 728                 srnext = sr->s_next;
 729                 ch_free( sr );
 730         }
 731         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 732         ch_free( so );
 733 }
 734
 735 /* Send a persistent search response */
 736 static int
 737 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so, Entry **e, int mode)
 738 {
 739         slap_overinst *on = opc->son;
 740
 741         SlapReply rs = { REP_SEARCH };
 742         LDAPControl *ctrls[2];
 743         struct berval cookie;
 744         Entry e_uuid = {0};
 745         Attribute a_uuid = {0};
 746
 747         if ( so->s_op->o_abandon )
 748                 return SLAPD_ABANDON;
 749
 750         ctrls[1] = NULL;
 751         slap_compose_sync_cookie( op, &cookie, &opc->sctxcsn, so->s_rid );
 752
 753         e_uuid.e_attrs = &a_uuid;
 754         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 755         a_uuid.a_nvals = &opc->suuid;
 756         rs.sr_err = syncprov_state_ctrl( op, &rs, &e_uuid,
 757                 mode, ctrls, 0, 1, &cookie );
 758         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
 759
 760         rs.sr_ctrls = ctrls;
 761         op->o_bd->bd_info = (BackendInfo *)on->on_info;
 762         switch( mode ) {
 763         case LDAP_SYNC_ADD:
 764                 rs.sr_entry = *e;
 765                 if ( rs.sr_entry->e_private )
 766                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 767                 if ( opc->sreference ) {
 768                         rs.sr_ref = get_entry_referrals( op, rs.sr_entry );
 769                         send_search_reference( op, &rs );
 770                         ber_bvarray_free( rs.sr_ref );
 771                         if ( !rs.sr_entry )
 772                                 *e = NULL;
 773                         break;
 774                 }
 775                 /* fallthru */
 776         case LDAP_SYNC_MODIFY:
 777                 rs.sr_entry = *e;
 778                 if ( rs.sr_entry->e_private )
 779                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 780                 rs.sr_attrs = op->ors_attrs;
 781                 send_search_entry( op, &rs );
 782                 if ( !rs.sr_entry )
 783                         *e = NULL;
 784                 break;
 785         case LDAP_SYNC_DELETE:
 786                 e_uuid.e_attrs = NULL;
 787                 e_uuid.e_name = opc->sdn;
 788                 e_uuid.e_nname = opc->sndn;
 789                 rs.sr_entry = &e_uuid;
 790                 if ( opc->sreference ) {
 791                         struct berval bv = BER_BVNULL;
 792                         rs.sr_ref = &bv;
 793                         send_search_reference( op, &rs );
 794                 } else {
 795                         send_search_entry( op, &rs );
 796                 }
 797                 break;
 798         default:
 799                 assert(0);
 800         }
 801         /* In case someone else freed it already? */
 802         if ( rs.sr_ctrls ) {
 803                 op->o_tmpfree( rs.sr_ctrls[0], op->o_tmpmemctx );
 804                 rs.sr_ctrls = NULL;
 805         }
 806
 807         return rs.sr_err;
 808 }
 809
 810 /* Play back queued responses */
 811 static int
 812 syncprov_qplay( Operation *op, slap_overinst *on, syncops *so )
 813 {
 814         syncres *sr;
 815         Entry *e;
 816         opcookie opc;
 817         int rc;
 818
 819         opc.son = on;
 820         op->o_bd->bd_info = (BackendInfo *)on->on_info;
 821
 822         for (;;) {
 823                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 824                 sr = so->s_res;
 825                 if ( sr )
 826                         so->s_res = sr->s_next;
 827                 if ( !so->s_res )
 828                         so->s_restail = NULL;
 829                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 830
 831                 if ( !sr || so->s_op->o_abandon )
 832                         break;
 833
 834                 opc.sdn = sr->s_dn;
 835                 opc.sndn = sr->s_ndn;
 836                 opc.suuid = sr->s_uuid;
 837                 opc.sctxcsn = sr->s_csn;
 838                 opc.sreference = sr->s_isreference;
 839                 e = NULL;
 840
 841                 if ( sr->s_mode != LDAP_SYNC_DELETE ) {
 842                         rc = be_entry_get_rw( op, &opc.sndn, NULL, NULL, 0, &e );
 843                         if ( rc ) {
 844                                 ch_free( sr );
 845                                 continue;
 846                         }
 847                 }
 848                 rc = syncprov_sendresp( op, &opc, so, &e, sr->s_mode );
 849
 850                 if ( e ) {
 851                         be_entry_release_rw( op, e, 0 );
 852                 }
 853
 854                 ch_free( sr );
 855
 856                 if ( rc )
 857                         break;
 858         }
 859         op->o_bd->bd_info = (BackendInfo *)on;
 860         return rc;
 861 }
 862
 863 /* runqueue task for playing back queued responses */
 864 static void *
 865 syncprov_qtask( void *ctx, void *arg )
 866 {
 867         struct re_s *rtask = arg;
 868         syncops *so = rtask->arg;
 869         slap_overinst *on = so->s_op->o_private;
 870         OperationBuffer opbuf;
 871         Operation *op;
 872         BackendDB be;
 873
 874         op = (Operation *) &opbuf;
 875         *op = *so->s_op;
 876         op->o_hdr = (Opheader *)(op+1);
 877         op->o_controls = (void **)(op->o_hdr+1);
 878         memset( op->o_controls, 0, SLAP_MAX_CIDS * sizeof(void *));
 879
 880         *op->o_hdr = *so->s_op->o_hdr;
 881
 882         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx);
 883         op->o_tmpmfuncs = &slap_sl_mfuncs;
 884         op->o_threadctx = ctx;
 885
 886         /* syncprov_qplay expects a fake db */
 887         be = *so->s_op->o_bd;
 888         be.be_flags |= SLAP_DBFLAG_OVERLAY;
 889         op->o_bd = &be;
 890         op->o_private = NULL;
 891         op->o_callback = NULL;
 892
 893         syncprov_qplay( op, on, so );
 894
 895         /* decrement use count... */
 896         syncprov_free_syncop( so );
 897
 898         /* wait until we get explicitly scheduled again */
 899         ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
 900         ldap_pvt_runqueue_stoptask( &slapd_rq, so->s_qtask );
 901         ldap_pvt_runqueue_resched( &slapd_rq, so->s_qtask, 1 );
 902         ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
 903
 904         return NULL;
 905 }
 906
 907 /* Queue a persistent search response */
 908 static int
 909 syncprov_qresp( opcookie *opc, syncops *so, int mode )
 910 {
 911         syncres *sr;
 912
 913         sr = ch_malloc(sizeof(syncres) + opc->suuid.bv_len + 1 +
 914                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1 + opc->sctxcsn.bv_len + 1 );
 915         sr->s_next = NULL;
 916         sr->s_dn.bv_val = (char *)(sr + 1);
 917         sr->s_dn.bv_len = opc->sdn.bv_len;
 918         sr->s_mode = mode;
 919         sr->s_isreference = opc->sreference;
 920         sr->s_ndn.bv_val = lutil_strcopy( sr->s_dn.bv_val,
 921                  opc->sdn.bv_val ) + 1;
 922         sr->s_ndn.bv_len = opc->sndn.bv_len;
 923         sr->s_uuid.bv_val = lutil_strcopy( sr->s_ndn.bv_val,
 924                  opc->sndn.bv_val ) + 1;
 925         sr->s_uuid.bv_len = opc->suuid.bv_len;
 926         AC_MEMCPY( sr->s_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
 927         sr->s_csn.bv_val = sr->s_uuid.bv_val + sr->s_uuid.bv_len + 1;
 928         sr->s_csn.bv_len = opc->sctxcsn.bv_len;
 929         strcpy( sr->s_csn.bv_val, opc->sctxcsn.bv_val );
 930
 931         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 932         if ( !so->s_res ) {
 933                 so->s_res = sr;
 934         } else {
 935                 so->s_restail->s_next = sr;
 936         }
 937         so->s_restail = sr;
 938
 939         /* If the base of the psearch was modified, check it next time round */
 940         if ( so->s_flags & PS_WROTE_BASE ) {
 941                 so->s_flags ^= PS_WROTE_BASE;
 942                 so->s_flags |= PS_FIND_BASE;
 943         }
 944         if ( so->s_flags & PS_IS_DETACHED ) {
 945                 ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
 946                 if ( !so->s_qtask ) {
 947                         so->s_qtask = ldap_pvt_runqueue_insert( &slapd_rq, RUNQ_INTERVAL,
 948                                 syncprov_qtask, so, "syncprov_qtask",
 949                                 so->s_op->o_conn->c_peer_name.bv_val );
 950                         ++so->s_inuse;
 951                 } else {
 952                         if (!ldap_pvt_runqueue_isrunning( &slapd_rq, so->s_qtask ) &&
 953                                 !so->s_qtask->next_sched.tv_sec ) {
 954                                 so->s_qtask->interval.tv_sec = 0;
 955                                 ldap_pvt_runqueue_resched( &slapd_rq, so->s_qtask, 0 );
 956                                 so->s_qtask->interval.tv_sec = RUNQ_INTERVAL;
 957                                 ++so->s_inuse;
 958                         }
 959                 }
 960                 ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
 961         }
 962         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 963         return LDAP_SUCCESS;
 964 }
 965
 966 static int
 967 syncprov_drop_psearch( syncops *so, int lock )
 968 {
 969         if ( so->s_flags & PS_IS_DETACHED ) {
 970                 if ( lock )
 971                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
 972                 so->s_op->o_conn->c_n_ops_executing--;
 973                 so->s_op->o_conn->c_n_ops_completed++;
 974                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, slap_op,
 975                         o_next );
 976                 if ( lock )
 977                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
 978         }
 979         syncprov_free_syncop( so );
 980
 981         return 0;
 982 }
 983
 984 static int
 985 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
 986 {
 987         slap_callback *sc = op->o_callback;
 988         op->o_callback = sc->sc_next;
 989         syncprov_drop_psearch( op->o_callback->sc_private, 0 );
 990         op->o_tmpfree( sc, op->o_tmpmemctx );
 991         return 0;
 992 }
 993
 994 static int
 995 syncprov_op_abandon( Operation *op, SlapReply *rs )
 996 {
 997         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 998         syncprov_info_t         *si = on->on_bi.bi_private;
 999         syncops *so, *soprev;
1000
1001         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1002         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
1003                 soprev=so, so=so->s_next ) {
1004                 if ( so->s_op->o_connid == op->o_connid &&
1005                         so->s_op->o_msgid == op->orn_msgid ) {
1006                                 so->s_op->o_abandon = 1;
1007                                 soprev->s_next = so->s_next;
1008                                 break;
1009                 }
1010         }
1011         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1012         if ( so ) {
1013                 /* Is this really a Cancel exop? */
1014                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
1015                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
1016                         rs->sr_err = LDAP_CANCELLED;
1017                         send_ldap_result( so->s_op, rs );
1018                         if ( so->s_flags & PS_IS_DETACHED ) {
1019                                 slap_callback *cb;
1020                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
1021                                 cb->sc_cleanup = syncprov_ab_cleanup;
1022                                 cb->sc_next = op->o_callback;
1023                                 cb->sc_private = so;
1024                                 return SLAP_CB_CONTINUE;
1025                         }
1026                 }
1027                 syncprov_drop_psearch( so, 0 );
1028         }
1029         return SLAP_CB_CONTINUE;
1030 }
1031
1032 /* Find which persistent searches are affected by this operation */
1033 static void
1034 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
1035 {
1036         slap_overinst *on = opc->son;
1037         syncprov_info_t         *si = on->on_bi.bi_private;
1038
1039         fbase_cookie fc;
1040         syncops *ss, *sprev, *snext;
1041         Entry *e;
1042         Attribute *a;
1043         int rc;
1044         struct berval newdn;
1045         int freefdn = 0;
1046
1047         fc.fdn = &op->o_req_ndn;
1048         /* compute new DN */
1049         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1050                 struct berval pdn;
1051                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
1052                 else dnParent( fc.fdn, &pdn );
1053                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
1054                 fc.fdn = &newdn;
1055                 freefdn = 1;
1056         }
1057         if ( op->o_tag != LDAP_REQ_ADD ) {
1058                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
1059                 rc = be_entry_get_rw( op, fc.fdn, NULL, NULL, 0, &e );
1060                 /* If we're sending responses now, make a copy and unlock the DB */
1061                 if ( e && !saveit ) {
1062                         Entry *e2 = entry_dup( e );
1063                         be_entry_release_rw( op, e, 0 );
1064                         e = e2;
1065                 }
1066                 op->o_bd->bd_info = (BackendInfo *)on;
1067                 if ( rc ) return;
1068         } else {
1069                 e = op->ora_e;
1070         }
1071
1072         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1073                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1074                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1075                 opc->sreference = is_entry_referral( e );
1076                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1077                 if ( a )
1078                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1079         } else if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1080                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1081                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1082                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1083                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1084         }
1085
1086         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1087         for (ss = si->si_ops, sprev = (syncops *)&si->si_ops; ss;
1088                 sprev = ss, ss=snext)
1089         {
1090                 syncmatches *sm;
1091                 int found = 0;
1092
1093                 snext = ss->s_next;
1094                 /* validate base */
1095                 fc.fss = ss;
1096                 fc.fbase = 0;
1097                 fc.fscope = 0;
1098
1099                 /* If the base of the search is missing, signal a refresh */
1100                 rc = syncprov_findbase( op, &fc );
1101                 if ( rc != LDAP_SUCCESS ) {
1102                         SlapReply rs = {REP_RESULT};
1103                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1104                                 "search base has changed" );
1105                         sprev->s_next = snext;
1106                         syncprov_drop_psearch( ss, 1 );
1107                         ss = sprev;
1108                         continue;
1109                 }
1110
1111
1112                 /* If we're sending results now, look for this op in old matches */
1113                 if ( !saveit ) {
1114                         syncmatches *old;
1115
1116                         /* Did we modify the search base? */
1117                         if ( dn_match( &op->o_req_ndn, &ss->s_base )) {
1118                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1119                                 ss->s_flags |= PS_WROTE_BASE;
1120                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1121                         }
1122
1123                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1124                                 old=sm, sm=sm->sm_next ) {
1125                                 if ( sm->sm_op == ss ) {
1126                                         found = 1;
1127                                         old->sm_next = sm->sm_next;
1128                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1129                                         break;
1130                                 }
1131                         }
1132                 }
1133
1134                 /* check if current o_req_dn is in scope and matches filter */
1135                 if ( fc.fscope && test_filter( op, e, ss->s_op->ors_filter ) ==
1136                         LDAP_COMPARE_TRUE ) {
1137                         if ( saveit ) {
1138                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1139                                 sm->sm_next = opc->smatches;
1140                                 sm->sm_op = ss;
1141                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1142                                 ++ss->s_inuse;
1143                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1144                                 opc->smatches = sm;
1145                         } else {
1146                                 /* if found send UPDATE else send ADD */
1147                                 syncprov_qresp( opc, ss,
1148                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD );
1149                         }
1150                 } else if ( !saveit && found ) {
1151                         /* send DELETE */
1152                         syncprov_qresp( opc, ss, LDAP_SYNC_DELETE );
1153                 }
1154         }
1155         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1156
1157         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1158                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
1159                 be_entry_release_rw( op, e, 0 );
1160                 op->o_bd->bd_info = (BackendInfo *)on;
1161         }
1162         if ( freefdn ) {
1163                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1164         }
1165 }
1166
1167 static int
1168 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1169 {
1170         slap_callback *cb = op->o_callback;
1171         opcookie *opc = cb->sc_private;
1172         slap_overinst *on = opc->son;
1173         syncprov_info_t         *si = on->on_bi.bi_private;
1174         syncmatches *sm, *snext;
1175         modtarget *mt, mtdummy;
1176
1177         for (sm = opc->smatches; sm; sm=snext) {
1178                 snext = sm->sm_next;
1179                 syncprov_free_syncop( sm->sm_op );
1180                 op->o_tmpfree( sm, op->o_tmpmemctx );
1181         }
1182
1183         /* Remove op from lock table */
1184         mtdummy.mt_op = op;
1185         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1186         mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1187         if ( mt ) {
1188                 modinst *mi = mt->mt_mods;
1189
1190                 /* If there are more, promote the next one */
1191                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1192                 if ( mi->mi_next ) {
1193                         mt->mt_mods = mi->mi_next;
1194                         mt->mt_op = mt->mt_mods->mi_op;
1195                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1196                 } else {
1197                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1198                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1199                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1200                         ch_free( mt );
1201                 }
1202         }
1203         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1204         if ( !BER_BVISNULL( &opc->suuid ))
1205                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1206         if ( !BER_BVISNULL( &opc->sndn ))
1207                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1208         if ( !BER_BVISNULL( &opc->sdn ))
1209                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1210         op->o_callback = cb->sc_next;
1211         op->o_tmpfree(cb, op->o_tmpmemctx);
1212
1213         return 0;
1214 }
1215
1216 static void
1217 syncprov_checkpoint( Operation *op, SlapReply *rs, slap_overinst *on )
1218 {
1219         syncprov_info_t         *si = on->on_bi.bi_private;
1220         Modifications mod;
1221         Operation opm;
1222         struct berval bv[2];
1223         slap_callback cb = {0};
1224         int manage = get_manageDSAit(op);
1225
1226         mod.sml_values = bv;
1227         bv[1].bv_val = NULL;
1228         bv[0] = si->si_ctxcsn;
1229         mod.sml_nvalues = NULL;
1230         mod.sml_desc = slap_schema.si_ad_contextCSN;
1231         mod.sml_op = LDAP_MOD_REPLACE;
1232         mod.sml_flags = 0;
1233         mod.sml_next = NULL;
1234
1235         cb.sc_response = slap_null_cb;
1236         opm = *op;
1237         opm.o_tag = LDAP_REQ_MODIFY;
1238         opm.o_callback = &cb;
1239         opm.orm_modlist = &mod;
1240         opm.o_req_dn = op->o_bd->be_suffix[0];
1241         opm.o_req_ndn = op->o_bd->be_nsuffix[0];
1242         opm.o_bd->bd_info = on->on_info->oi_orig;
1243         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1244         opm.o_bd->be_modify( &opm, rs );
1245         opm.o_managedsait = manage;
1246 }
1247
1248 static void
1249 syncprov_add_slog( Operation *op, struct berval *csn )
1250 {
1251         opcookie *opc = op->o_callback->sc_private;
1252         slap_overinst *on = opc->son;
1253         syncprov_info_t         *si = on->on_bi.bi_private;
1254         sessionlog *sl;
1255         slog_entry *se;
1256
1257         sl = si->si_logs;
1258         {
1259                 /* Allocate a record. UUIDs are not NUL-terminated. */
1260                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1261                         csn->bv_len + 1 );
1262                 se->se_next = NULL;
1263                 se->se_tag = op->o_tag;
1264
1265                 se->se_uuid.bv_val = (char *)(se+1);
1266                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1267                 se->se_uuid.bv_len = opc->suuid.bv_len;
1268
1269                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1270                 AC_MEMCPY( se->se_csn.bv_val, csn->bv_val, csn->bv_len );
1271                 se->se_csn.bv_val[csn->bv_len] = '\0';
1272                 se->se_csn.bv_len = csn->bv_len;
1273
1274                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1275                 if ( sl->sl_head ) {
1276                         sl->sl_tail->se_next = se;
1277                 } else {
1278                         sl->sl_head = se;
1279                 }
1280                 sl->sl_tail = se;
1281                 sl->sl_num++;
1282                 while ( sl->sl_num > sl->sl_size ) {
1283                         se = sl->sl_head;
1284                         sl->sl_head = se->se_next;
1285                         strcpy( sl->sl_mincsn.bv_val, se->se_csn.bv_val );
1286                         sl->sl_mincsn.bv_len = se->se_csn.bv_len;
1287                         ch_free( se );
1288                         sl->sl_num--;
1289                         if ( !sl->sl_head ) {
1290                                 sl->sl_tail = NULL;
1291                         }
1292                 }
1293                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1294         }
1295 }
1296
1297 /* Just set a flag if we found the matching entry */
1298 static int
1299 playlog_cb( Operation *op, SlapReply *rs )
1300 {
1301         if ( rs->sr_type == REP_SEARCH ) {
1302                 op->o_callback->sc_private = (void *)1;
1303         }
1304         return rs->sr_err;
1305 }
1306
1307 /* enter with sl->sl_mutex locked, release before returning */
1308 static void
1309 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1310         struct berval *oldcsn, struct berval *ctxcsn )
1311 {
1312         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1313         slog_entry *se;
1314         int i, j, ndel, num, nmods, mmods;
1315         BerVarray uuids;
1316
1317         if ( !sl->sl_num ) {
1318                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1319                 return;
1320         }
1321
1322         num = sl->sl_num;
1323         i = 0;
1324         nmods = 0;
1325
1326         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1327                 num * UUID_LEN, op->o_tmpmemctx );
1328
1329         uuids[0].bv_val = (char *)(uuids + num + 1);
1330
1331         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1332          * and everything else at the end. Do this first so we can
1333          * unlock the list mutex.
1334          */
1335         for ( se=sl->sl_head; se; se=se->se_next ) {
1336                 if ( ber_bvcmp( &se->se_csn, oldcsn ) < 0 ) continue;
1337                 if ( ber_bvcmp( &se->se_csn, ctxcsn ) > 0 ) break;
1338                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1339                         j = i;
1340                         i++;
1341                 } else {
1342                         nmods++;
1343                         j = num - nmods;
1344                 }
1345                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1346                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1347                 uuids[j].bv_len = UUID_LEN;
1348         }
1349         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1350
1351         ndel = i;
1352
1353         /* Zero out unused slots */
1354         for ( i=ndel; i < num - nmods; i++ )
1355                 uuids[i].bv_len = 0;
1356
1357         /* Mods must be validated to see if they belong in this delete set.
1358          */
1359
1360         mmods = nmods;
1361         /* Strip any duplicates */
1362         for ( i=0; i<nmods; i++ ) {
1363                 for ( j=0; j<ndel; j++ ) {
1364                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1365                                 uuids[num - 1 - i].bv_len = 0;
1366                                 mmods --;
1367                                 break;
1368                         }
1369                 }
1370                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1371                 for ( j=0; j<i; j++ ) {
1372                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1373                                 uuids[num - 1 - i].bv_len = 0;
1374                                 mmods --;
1375                                 break;
1376                         }
1377                 }
1378         }
1379
1380         if ( mmods ) {
1381                 Operation fop;
1382                 SlapReply frs = { REP_RESULT };
1383                 int rc;
1384                 Filter mf, af;
1385 #ifdef LDAP_COMP_MATCH
1386                 AttributeAssertion eq = { NULL, BER_BVNULL, NULL };
1387 #else
1388                 AttributeAssertion eq;
1389 #endif
1390                 slap_callback cb = {0};
1391
1392                 fop = *op;
1393
1394                 fop.o_sync_mode = 0;
1395                 fop.o_callback = &cb;
1396                 fop.ors_limit = NULL;
1397                 fop.ors_tlimit = SLAP_NO_LIMIT;
1398                 fop.ors_attrs = slap_anlist_all_attributes;
1399                 fop.ors_attrsonly = 0;
1400                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1401
1402                 af.f_choice = LDAP_FILTER_AND;
1403                 af.f_next = NULL;
1404                 af.f_and = &mf;
1405                 mf.f_choice = LDAP_FILTER_EQUALITY;
1406                 mf.f_ava = &eq;
1407                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1408                 mf.f_next = fop.ors_filter;
1409
1410                 fop.ors_filter = &af;
1411
1412                 cb.sc_response = playlog_cb;
1413                 fop.o_bd->bd_info = on->on_info->oi_orig;
1414
1415                 for ( i=ndel; i<num; i++ ) {
1416                         if ( uuids[i].bv_len == 0 ) continue;
1417
1418                         mf.f_av_value = uuids[i];
1419                         cb.sc_private = NULL;
1420                         fop.ors_slimit = 1;
1421                         rc = fop.o_bd->be_search( &fop, &frs );
1422
1423                         /* If entry was not found, add to delete list */
1424                         if ( !cb.sc_private ) {
1425                                 uuids[ndel++] = uuids[i];
1426                         }
1427                 }
1428                 fop.o_bd->bd_info = (BackendInfo *)on;
1429         }
1430         if ( ndel ) {
1431                 uuids[ndel].bv_val = NULL;
1432                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL, 0, uuids, 1 );
1433         }
1434 }
1435
1436 static int
1437 syncprov_op_response( Operation *op, SlapReply *rs )
1438 {
1439         opcookie *opc = op->o_callback->sc_private;
1440         slap_overinst *on = opc->son;
1441         syncprov_info_t         *si = on->on_bi.bi_private;
1442         syncmatches *sm;
1443
1444         if ( rs->sr_err == LDAP_SUCCESS )
1445         {
1446                 struct berval maxcsn = BER_BVNULL, curcsn = BER_BVNULL;
1447                 char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1448
1449                 /* Update our context CSN */
1450                 cbuf[0] = '\0';
1451                 ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1452                 slap_get_commit_csn( op, &maxcsn, &curcsn );
1453                 if ( !BER_BVISNULL( &maxcsn ) ) {
1454                         strcpy( cbuf, maxcsn.bv_val );
1455                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn ) > 0 ) {
1456                                 strcpy( si->si_ctxcsnbuf, cbuf );
1457                                 si->si_ctxcsn.bv_len = maxcsn.bv_len;
1458                         }
1459                 }
1460
1461                 /* Don't do any processing for consumer contextCSN updates */
1462                 if ( SLAP_SYNC_SHADOW( op->o_bd ) &&
1463                         op->o_msgid == SLAP_SYNC_UPDATE_MSGID ) {
1464                         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1465                         return SLAP_CB_CONTINUE;
1466                 }
1467
1468                 si->si_numops++;
1469                 if ( si->si_chkops || si->si_chktime ) {
1470                         int do_check=0;
1471                         if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1472                                 do_check = 1;
1473                                 si->si_numops = 0;
1474                         }
1475                         if ( si->si_chktime &&
1476                                 (op->o_time - si->si_chklast >= si->si_chktime )) {
1477                                 do_check = 1;
1478                                 si->si_chklast = op->o_time;
1479                         }
1480                         if ( do_check ) {
1481                                 syncprov_checkpoint( op, rs, on );
1482                         }
1483                 }
1484                 ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1485
1486                 opc->sctxcsn.bv_len = maxcsn.bv_len;
1487                 opc->sctxcsn.bv_val = cbuf;
1488
1489                 /* Handle any persistent searches */
1490                 if ( si->si_ops ) {
1491                         switch(op->o_tag) {
1492                         case LDAP_REQ_ADD:
1493                         case LDAP_REQ_MODIFY:
1494                         case LDAP_REQ_MODRDN:
1495                         case LDAP_REQ_EXTENDED:
1496                                 syncprov_matchops( op, opc, 0 );
1497                                 break;
1498                         case LDAP_REQ_DELETE:
1499                                 /* for each match in opc->smatches:
1500                                  *   send DELETE msg
1501                                  */
1502                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1503                                         if ( sm->sm_op->s_op->o_abandon )
1504                                                 continue;
1505                                         syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_DELETE );
1506                                 }
1507                                 break;
1508                         }
1509                 }
1510
1511                 /* Add any log records */
1512                 if ( si->si_logs && op->o_tag != LDAP_REQ_ADD ) {
1513                         syncprov_add_slog( op, &curcsn );
1514                 }
1515
1516         }
1517         return SLAP_CB_CONTINUE;
1518 }
1519
1520 /* We don't use a subentry to store the context CSN any more.
1521  * We expose the current context CSN as an operational attribute
1522  * of the suffix entry.
1523  */
1524 static int
1525 syncprov_op_compare( Operation *op, SlapReply *rs )
1526 {
1527         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1528         syncprov_info_t         *si = on->on_bi.bi_private;
1529         int rc = SLAP_CB_CONTINUE;
1530
1531         if ( dn_match( &op->o_req_ndn, op->o_bd->be_nsuffix ) &&
1532                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1533         {
1534                 Entry e = {0};
1535                 Attribute a = {0};
1536                 struct berval bv[2];
1537
1538                 e.e_name = op->o_bd->be_suffix[0];
1539                 e.e_nname = op->o_bd->be_nsuffix[0];
1540
1541                 BER_BVZERO( &bv[1] );
1542                 bv[0] = si->si_ctxcsn;
1543
1544                 a.a_desc = slap_schema.si_ad_contextCSN;
1545                 a.a_vals = bv;
1546                 a.a_nvals = a.a_vals;
1547
1548                 ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1549
1550                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1551                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1552                 if ( ! rs->sr_err ) {
1553                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1554                         goto return_results;
1555                 }
1556
1557                 if ( get_assert( op ) &&
1558                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
1559                 {
1560                         rs->sr_err = LDAP_ASSERTION_FAILED;
1561                         goto return_results;
1562                 }
1563
1564
1565                 rs->sr_err = LDAP_COMPARE_FALSE;
1566
1567                 if ( value_find_ex( op->oq_compare.rs_ava->aa_desc,
1568                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
1569                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
1570                                 a.a_nvals, &op->oq_compare.rs_ava->aa_value, op->o_tmpmemctx ) == 0 )
1571                 {
1572                         rs->sr_err = LDAP_COMPARE_TRUE;
1573                 }
1574
1575 return_results:;
1576
1577                 ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1578
1579                 send_ldap_result( op, rs );
1580
1581                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
1582                         rs->sr_err = LDAP_SUCCESS;
1583                 }
1584                 rc = rs->sr_err;
1585         }
1586
1587         return rc;
1588 }
1589
1590 static int
1591 syncprov_op_mod( Operation *op, SlapReply *rs )
1592 {
1593         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1594         syncprov_info_t         *si = on->on_bi.bi_private;
1595
1596         slap_callback *cb = op->o_tmpcalloc(1, sizeof(slap_callback)+
1597                 sizeof(opcookie) +
1598                 (si->si_ops ? sizeof(modinst) : 0 ),
1599                 op->o_tmpmemctx);
1600         opcookie *opc = (opcookie *)(cb+1);
1601         opc->son = on;
1602         cb->sc_response = syncprov_op_response;
1603         cb->sc_cleanup = syncprov_op_cleanup;
1604         cb->sc_private = opc;
1605         cb->sc_next = op->o_callback;
1606         op->o_callback = cb;
1607
1608         /* If there are active persistent searches, lock this operation.
1609          * See seqmod.c for the locking logic on its own.
1610          */
1611         if ( si->si_ops ) {
1612                 modtarget *mt, mtdummy;
1613                 modinst *mi;
1614
1615                 mi = (modinst *)(opc+1);
1616                 mi->mi_op = op;
1617
1618                 /* See if we're already modifying this entry... */
1619                 mtdummy.mt_op = op;
1620                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1621                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1622                 if ( mt ) {
1623                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1624                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1625                         mt->mt_tail->mi_next = mi;
1626                         mt->mt_tail = mi;
1627                         /* wait for this op to get to head of list */
1628                         while ( mt->mt_mods != mi ) {
1629                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1630                                 ldap_pvt_thread_yield();
1631                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1632
1633                                 /* clean up if the caller is giving up */
1634                                 if ( op->o_abandon ) {
1635                                         modinst *m2;
1636                                         for ( m2 = mt->mt_mods; m2->mi_next != mi;
1637                                                 m2 = m2->mi_next );
1638                                         m2->mi_next = mi->mi_next;
1639                                         if ( mt->mt_tail == mi ) mt->mt_tail = m2;
1640                                         op->o_tmpfree( cb, op->o_tmpmemctx );
1641                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1642                                         return SLAPD_ABANDON;
1643                                 }
1644                         }
1645                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1646                 } else {
1647                         /* Record that we're modifying this entry now */
1648                         mt = ch_malloc( sizeof(modtarget) );
1649                         mt->mt_mods = mi;
1650                         mt->mt_tail = mi;
1651                         mt->mt_op = mi->mi_op;
1652                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
1653                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
1654                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1655                 }
1656         }
1657
1658         if (( si->si_ops || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
1659                 syncprov_matchops( op, opc, 1 );
1660
1661         return SLAP_CB_CONTINUE;
1662 }
1663
1664 static int
1665 syncprov_op_extended( Operation *op, SlapReply *rs )
1666 {
1667         if ( exop_is_write( op ))
1668                 return syncprov_op_mod( op, rs );
1669
1670         return SLAP_CB_CONTINUE;
1671 }
1672
1673 typedef struct searchstate {
1674         slap_overinst *ss_on;
1675         syncops *ss_so;
1676         int ss_present;
1677         struct berval ss_ctxcsn;
1678         char ss_csnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1679 } searchstate;
1680
1681 static int
1682 syncprov_search_cleanup( Operation *op, SlapReply *rs )
1683 {
1684         if ( rs->sr_ctrls ) {
1685                 op->o_tmpfree( rs->sr_ctrls[0], op->o_tmpmemctx );
1686                 op->o_tmpfree( rs->sr_ctrls, op->o_tmpmemctx );
1687                 rs->sr_ctrls = NULL;
1688         }
1689         return 0;
1690 }
1691
1692 static void
1693 syncprov_detach_op( Operation *op, syncops *so, slap_overinst *on )
1694 {
1695         Operation *op2;
1696         int i, alen = 0;
1697         size_t size;
1698         char *ptr;
1699         GroupAssertion *g1, *g2;
1700
1701         /* count the search attrs */
1702         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1703                 alen += op->ors_attrs[i].an_name.bv_len + 1;
1704         }
1705         /* Make a new copy of the operation */
1706         size = sizeof(Operation) + sizeof(Opheader) +
1707                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
1708                 op->o_req_dn.bv_len + 1 +
1709                 op->o_req_ndn.bv_len + 1 +
1710                 op->o_ndn.bv_len + 1 +
1711                 so->s_filterstr.bv_len + 1;
1712         op2 = (Operation *)ch_calloc( 1, size );
1713         op2->o_hdr = (Opheader *)(op2+1);
1714
1715         /* Copy the fields we care about explicitly, leave the rest alone */
1716         *op2->o_hdr = *op->o_hdr;
1717         op2->o_tag = op->o_tag;
1718         op2->o_time = op->o_time;
1719         op2->o_bd = on->on_info->oi_origdb;
1720         op2->o_request = op->o_request;
1721         op2->o_private = on;
1722
1723         if ( i ) {
1724                 op2->ors_attrs = (AttributeName *)(op2->o_hdr + 1);
1725                 ptr = (char *)(op2->ors_attrs+i+1);
1726                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1727                         op2->ors_attrs[i] = op->ors_attrs[i];
1728                         op2->ors_attrs[i].an_name.bv_val = ptr;
1729                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
1730                 }
1731                 BER_BVZERO( &op2->ors_attrs[i].an_name );
1732         } else {
1733                 ptr = (char *)(op2->o_hdr + 1);
1734         }
1735         op2->o_authz = op->o_authz;
1736         op2->o_ndn.bv_val = ptr;
1737         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
1738         op2->o_dn = op2->o_ndn;
1739         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
1740         op2->o_req_dn.bv_val = ptr;
1741         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
1742         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
1743         op2->o_req_ndn.bv_val = ptr;
1744         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
1745         op2->ors_filterstr.bv_val = ptr;
1746         strcpy( ptr, so->s_filterstr.bv_val );
1747         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
1748         op2->ors_filter = str2filter( ptr );
1749         so->s_op = op2;
1750
1751         /* Copy any cached group ACLs individually */
1752         op2->o_groups = NULL;
1753         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
1754                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
1755                 *g2 = *g1;
1756                 strcpy( g2->ga_ndn, g1->ga_ndn );
1757                 g2->ga_next = op2->o_groups;
1758                 op2->o_groups = g2;
1759         }
1760         /* Don't allow any further group caching */
1761         op2->o_do_not_cache = 1;
1762
1763         /* Add op2 to conn so abandon will find us */
1764         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
1765         op->o_conn->c_n_ops_executing++;
1766         op->o_conn->c_n_ops_completed--;
1767         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
1768         so->s_flags |= PS_IS_DETACHED;
1769         ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
1770 }
1771
1772 static int
1773 syncprov_search_response( Operation *op, SlapReply *rs )
1774 {
1775         searchstate *ss = op->o_callback->sc_private;
1776         slap_overinst *on = ss->ss_on;
1777         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
1778
1779         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
1780                 Attribute *a;
1781                 /* If we got a referral without a referral object, there's
1782                  * something missing that we cannot replicate. Just ignore it.
1783                  * The consumer will abort because we didn't send the expected
1784                  * control.
1785                  */
1786                 if ( !rs->sr_entry ) {
1787                         assert( rs->sr_entry != NULL );
1788                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
1789                         return SLAP_CB_CONTINUE;
1790                 }
1791                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryCSN );
1792                 if ( a ) {
1793                         /* Make sure entry is less than the snaphot'd contextCSN */
1794                         if ( ber_bvcmp( &a->a_nvals[0], &ss->ss_ctxcsn ) > 0 )
1795                                 return LDAP_SUCCESS;
1796
1797                         /* Don't send the ctx entry twice */
1798                         if ( !BER_BVISNULL( &srs->sr_state.ctxcsn ) &&
1799                                 bvmatch( &a->a_nvals[0], &srs->sr_state.ctxcsn ) )
1800                                 return LDAP_SUCCESS;
1801                 }
1802                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1803                         op->o_tmpmemctx );
1804                 rs->sr_ctrls[1] = NULL;
1805                 rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
1806                         LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
1807         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
1808                 struct berval cookie;
1809
1810                 slap_compose_sync_cookie( op, &cookie, &ss->ss_ctxcsn,
1811                         srs->sr_state.rid );
1812
1813                 /* Is this a regular refresh? */
1814                 if ( !ss->ss_so ) {
1815                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1816                                 op->o_tmpmemctx );
1817                         rs->sr_ctrls[1] = NULL;
1818                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
1819                                 0, 1, &cookie, ss->ss_present ?  LDAP_SYNC_REFRESH_PRESENTS :
1820                                         LDAP_SYNC_REFRESH_DELETES );
1821                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1822                 } else {
1823                 /* It's RefreshAndPersist, transition to Persist phase */
1824                         syncprov_sendinfo( op, rs, ( ss->ss_present && rs->sr_nentries ) ?
1825                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
1826                                 &cookie, 1, NULL, 0 );
1827                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1828
1829                         /* Detach this Op from frontend control */
1830                         ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
1831
1832                         /* Turn off the refreshing flag */
1833                         ss->ss_so->s_flags ^= PS_IS_REFRESHING;
1834
1835                         syncprov_detach_op( op, ss->ss_so, on );
1836                         ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
1837
1838                         return LDAP_SUCCESS;
1839                 }
1840         }
1841
1842         return SLAP_CB_CONTINUE;
1843 }
1844
1845 static int
1846 syncprov_op_search( Operation *op, SlapReply *rs )
1847 {
1848         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1849         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
1850         slap_callback   *cb;
1851         int gotstate = 0, nochange = 0, do_present;
1852         syncops *sop = NULL;
1853         searchstate *ss;
1854         sync_control *srs;
1855         struct berval ctxcsn;
1856         char csnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1857
1858         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
1859
1860         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
1861                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
1862                 return rs->sr_err;
1863         }
1864
1865         do_present = si->si_nopres ? 0 : 1;
1866
1867         srs = op->o_controls[slap_cids.sc_LDAPsync];
1868         op->o_managedsait = SLAP_CONTROL_NONCRITICAL;
1869
1870         /* If this is a persistent search, set it up right away */
1871         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
1872                 syncops so = {0};
1873                 fbase_cookie fc;
1874                 opcookie opc;
1875                 slap_callback sc;
1876
1877                 fc.fss = &so;
1878                 fc.fbase = 0;
1879                 so.s_eid = NOID;
1880                 so.s_op = op;
1881                 so.s_flags = PS_IS_REFRESHING | PS_FIND_BASE;
1882                 /* syncprov_findbase expects to be called as a callback... */
1883                 sc.sc_private = &opc;
1884                 opc.son = on;
1885                 cb = op->o_callback;
1886                 op->o_callback = &sc;
1887                 rs->sr_err = syncprov_findbase( op, &fc );
1888                 op->o_callback = cb;
1889
1890                 if ( rs->sr_err != LDAP_SUCCESS ) {
1891                         send_ldap_result( op, rs );
1892                         return rs->sr_err;
1893                 }
1894                 sop = ch_malloc( sizeof( syncops ));
1895                 *sop = so;
1896                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
1897                 sop->s_rid = srs->sr_state.rid;
1898                 sop->s_inuse = 1;
1899
1900                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1901                 sop->s_next = si->si_ops;
1902                 si->si_ops = sop;
1903                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1904         }
1905
1906         /* snapshot the ctxcsn */
1907         ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1908         strcpy( csnbuf, si->si_ctxcsnbuf );
1909         ctxcsn.bv_len = si->si_ctxcsn.bv_len;
1910         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1911         ctxcsn.bv_val = csnbuf;
1912
1913         /* If we have a cookie, handle the PRESENT lookups */
1914         if ( !BER_BVISNULL( &srs->sr_state.ctxcsn )) {
1915                 sessionlog *sl;
1916
1917                 /* The cookie was validated when it was parsed, just use it */
1918
1919                 /* If just Refreshing and nothing has changed, shortcut it */
1920                 if ( bvmatch( &srs->sr_state.ctxcsn, &ctxcsn )) {
1921                         nochange = 1;
1922                         if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
1923                                 LDAPControl     *ctrls[2];
1924
1925                                 ctrls[0] = NULL;
1926                                 ctrls[1] = NULL;
1927                                 syncprov_done_ctrl( op, rs, ctrls, 0, 0,
1928                                         NULL, LDAP_SYNC_REFRESH_DELETES );
1929                                 rs->sr_ctrls = ctrls;
1930                                 rs->sr_err = LDAP_SUCCESS;
1931                                 send_ldap_result( op, rs );
1932                                 rs->sr_ctrls = NULL;
1933                                 return rs->sr_err;
1934                         }
1935                         goto shortcut;
1936                 }
1937                 /* Do we have a sessionlog for this search? */
1938                 sl=si->si_logs;
1939                 if ( sl ) {
1940                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1941                         if ( ber_bvcmp( &srs->sr_state.ctxcsn, &sl->sl_mincsn ) >= 0 ) {
1942                                 do_present = 0;
1943                                 /* mutex is unlocked in playlog */
1944                                 syncprov_playlog( op, rs, sl, &srs->sr_state.ctxcsn, &ctxcsn );
1945                         } else {
1946                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1947                         }
1948                 }
1949                 /* Is the CSN still present in the database? */
1950                 if ( syncprov_findcsn( op, FIND_CSN ) != LDAP_SUCCESS ) {
1951                         /* No, so a reload is required */
1952                         /* the 2.2 consumer doesn't send this hint */
1953                         if ( si->si_usehint && srs->sr_rhint == 0 ) {
1954                                 send_ldap_error( op, rs, LDAP_SYNC_REFRESH_REQUIRED, "sync cookie is stale" );
1955                                 return rs->sr_err;
1956                         }
1957                 } else {
1958                         gotstate = 1;
1959                         /* If changed and doing Present lookup, send Present UUIDs */
1960                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT ) !=
1961                                 LDAP_SUCCESS ) {
1962                                 send_ldap_result( op, rs );
1963                                 return rs->sr_err;
1964                         }
1965                 }
1966         }
1967
1968 shortcut:
1969         /* Append CSN range to search filter, save original filter
1970          * for persistent search evaluation
1971          */
1972         if ( sop ) {
1973                 sop->s_filterstr= op->ors_filterstr;
1974         }
1975
1976         /* If something changed, find the changes */
1977         if ( gotstate && !nochange ) {
1978                 Filter *fand, *fava;
1979
1980                 fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
1981                 fand->f_choice = LDAP_FILTER_AND;
1982                 fand->f_next = NULL;
1983                 fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
1984                 fand->f_and = fava;
1985                 fava->f_choice = LDAP_FILTER_GE;
1986                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
1987                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
1988 #ifdef LDAP_COMP_MATCH
1989                 fava->f_ava->aa_cf = NULL;
1990 #endif
1991                 ber_dupbv_x( &fava->f_ava->aa_value, &srs->sr_state.ctxcsn, op->o_tmpmemctx );
1992                 fava->f_next = op->ors_filter;
1993                 op->ors_filter = fand;
1994                 filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
1995         }
1996
1997         /* Let our callback add needed info to returned entries */
1998         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
1999         ss = (searchstate *)(cb+1);
2000         ss->ss_on = on;
2001         ss->ss_so = sop;
2002         ss->ss_present = do_present;
2003         ss->ss_ctxcsn.bv_len = ctxcsn.bv_len;
2004         ss->ss_ctxcsn.bv_val = ss->ss_csnbuf;
2005         strcpy( ss->ss_ctxcsn.bv_val, ctxcsn.bv_val );
2006         cb->sc_response = syncprov_search_response;
2007         cb->sc_cleanup = syncprov_search_cleanup;
2008         cb->sc_private = ss;
2009         cb->sc_next = op->o_callback;
2010         op->o_callback = cb;
2011
2012 #if 0   /* I don't think we need to shortcircuit back-bdb any more */
2013         op->o_sync_mode &= SLAP_CONTROL_MASK;
2014 #endif
2015
2016         /* If this is a persistent search and no changes were reported during
2017          * the refresh phase, just invoke the response callback to transition
2018          * us into persist phase
2019          */
2020         if ( nochange ) {
2021                 rs->sr_err = LDAP_SUCCESS;
2022                 rs->sr_nentries = 0;
2023                 send_ldap_result( op, rs );
2024                 return rs->sr_err;
2025         }
2026         return SLAP_CB_CONTINUE;
2027 }
2028
2029 static int
2030 syncprov_operational(
2031         Operation *op,
2032         SlapReply *rs )
2033 {
2034         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2035         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2036
2037         if ( rs->sr_entry &&
2038                 dn_match( &rs->sr_entry->e_nname, op->o_bd->be_nsuffix )) {
2039
2040                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
2041                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
2042                         Attribute *a, **ap = NULL;
2043
2044                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
2045                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
2046                                         break;
2047                         }
2048
2049                         if ( !a ) {
2050                                 for ( ap = &rs->sr_operational_attrs; *ap; ap=&(*ap)->a_next );
2051
2052                                 a = ch_malloc( sizeof(Attribute));
2053                                 a->a_desc = slap_schema.si_ad_contextCSN;
2054                                 a->a_vals = ch_malloc( 2 * sizeof(struct berval));
2055                                 a->a_vals[1].bv_val = NULL;
2056                                 a->a_nvals = a->a_vals;
2057                                 a->a_next = NULL;
2058                                 a->a_flags = 0;
2059                                 *ap = a;
2060                         }
2061
2062                         ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
2063                         if ( !ap ) {
2064                                 strcpy( a->a_vals[0].bv_val, si->si_ctxcsnbuf );
2065                         } else {
2066                                 ber_dupbv( &a->a_vals[0], &si->si_ctxcsn );
2067                         }
2068                         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
2069                 }
2070         }
2071         return SLAP_CB_CONTINUE;
2072 }
2073
2074 enum {
2075         SP_CHKPT = 1,
2076         SP_SESSL,
2077         SP_NOPRES,
2078         SP_USEHINT
2079 };
2080
2081 static ConfigDriver sp_cf_gen;
2082
2083 static ConfigTable spcfg[] = {
2084         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2085                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2086                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2087                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2088         { "syncprov-sessionlog", "ops", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2089                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2090                         "DESC 'Session log size in ops' "
2091                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2092         { "syncprov-nopresent", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_NOPRES,
2093                 sp_cf_gen, "( OLcfgOvAt:1.3 NAME 'olcSpNoPresent' "
2094                         "DESC 'Omit Present phase processing' "
2095                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2096         { "syncprov-reloadhint", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_USEHINT,
2097                 sp_cf_gen, "( OLcfgOvAt:1.4 NAME 'olcSpReloadHint' "
2098                         "DESC 'Observe Reload Hint in Request control' "
2099                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2100         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2101 };
2102
2103 static ConfigOCs spocs[] = {
2104         { "( OLcfgOvOc:1.1 "
2105                 "NAME 'olcSyncProvConfig' "
2106                 "DESC 'SyncRepl Provider configuration' "
2107                 "SUP olcOverlayConfig "
2108                 "MAY ( olcSpCheckpoint $ olcSpSessionlog $ olcSpNoPresent ) )",
2109                         Cft_Overlay, spcfg },
2110         { NULL, 0, NULL }
2111 };
2112
2113 static int
2114 sp_cf_gen(ConfigArgs *c)
2115 {
2116         slap_overinst           *on = (slap_overinst *)c->bi;
2117         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2118         int rc = 0;
2119
2120         if ( c->op == SLAP_CONFIG_EMIT ) {
2121                 switch ( c->type ) {
2122                 case SP_CHKPT:
2123                         if ( si->si_chkops || si->si_chktime ) {
2124                                 struct berval bv;
2125                                 bv.bv_len = sprintf( c->msg, "%d %d",
2126                                         si->si_chkops, si->si_chktime );
2127                                 bv.bv_val = c->msg;
2128                                 value_add_one( &c->rvalue_vals, &bv );
2129                         } else {
2130                                 rc = 1;
2131                         }
2132                         break;
2133                 case SP_SESSL:
2134                         if ( si->si_logs ) {
2135                                 c->value_int = si->si_logs->sl_size;
2136                         } else {
2137                                 rc = 1;
2138                         }
2139                         break;
2140                 case SP_NOPRES:
2141                         if ( si->si_nopres ) {
2142                                 c->value_int = 1;
2143                         } else {
2144                                 rc = 1;
2145                         }
2146                         break;
2147                 case SP_USEHINT:
2148                         if ( si->si_usehint ) {
2149                                 c->value_int = 1;
2150                         } else {
2151                                 rc = 1;
2152                         }
2153                         break;
2154                 }
2155                 return rc;
2156         } else if ( c->op == LDAP_MOD_DELETE ) {
2157                 switch ( c->type ) {
2158                 case SP_CHKPT:
2159                         si->si_chkops = 0;
2160                         si->si_chktime = 0;
2161                         break;
2162                 case SP_SESSL:
2163                         if ( si->si_logs )
2164                                 si->si_logs->sl_size = 0;
2165                         else
2166                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2167                         break;
2168                 case SP_NOPRES:
2169                         if ( si->si_nopres )
2170                                 si->si_nopres = 0;
2171                         else
2172                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2173                         break;
2174                 case SP_USEHINT:
2175                         if ( si->si_usehint )
2176                                 si->si_usehint = 0;
2177                         else
2178                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2179                         break;
2180                 }
2181                 return rc;
2182         }
2183         switch ( c->type ) {
2184         case SP_CHKPT:
2185                 si->si_chkops = atoi( c->argv[1] );
2186                 si->si_chktime = atoi( c->argv[2] ) * 60;
2187                 break;
2188         case SP_SESSL: {
2189                 sessionlog *sl;
2190                 int size = c->value_int;
2191
2192                 if ( size < 0 ) {
2193                         sprintf( c->msg, "%s size %d is negative",
2194                                 c->argv[0], size );
2195                         Debug( LDAP_DEBUG_CONFIG, "%s: %s\n", c->log, c->msg, 0 );
2196                         return ARG_BAD_CONF;
2197                 }
2198                 sl = si->si_logs;
2199                 if ( !sl ) {
2200                         sl = ch_malloc( sizeof( sessionlog ) + LDAP_LUTIL_CSNSTR_BUFSIZE );
2201                         sl->sl_mincsn.bv_val = (char *)(sl+1);
2202                         sl->sl_mincsn.bv_len = 0;
2203                         sl->sl_num = 0;
2204                         sl->sl_head = sl->sl_tail = NULL;
2205                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
2206                         si->si_logs = sl;
2207                 }
2208                 sl->sl_size = size;
2209                 }
2210                 break;
2211         case SP_NOPRES:
2212                 si->si_nopres = c->value_int;
2213                 break;
2214         case SP_USEHINT:
2215                 si->si_usehint = c->value_int;
2216                 break;
2217         }
2218         return rc;
2219 }
2220
2221 /* ITS#3456 we cannot run this search on the main thread, must use a
2222  * child thread in order to insure we have a big enough stack.
2223  */
2224 static void *
2225 syncprov_db_otask(
2226         void *ptr
2227 )
2228 {
2229         syncprov_findcsn( ptr, FIND_MAXCSN );
2230         return NULL;
2231 }
2232
2233 /* Read any existing contextCSN from the underlying db.
2234  * Then search for any entries newer than that. If no value exists,
2235  * just generate it. Cache whatever result.
2236  */
2237 static int
2238 syncprov_db_open(
2239     BackendDB *be
2240 )
2241 {
2242         slap_overinst   *on = (slap_overinst *) be->bd_info;
2243         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2244
2245         Connection conn;
2246         OperationBuffer opbuf;
2247         char ctxcsnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
2248         Operation *op = (Operation *) &opbuf;
2249         Entry *e;
2250         Attribute *a;
2251         int rc;
2252         void *thrctx = NULL;
2253
2254         if ( slapMode & SLAP_TOOL_MODE ) {
2255                 return 0;
2256         }
2257
2258         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
2259         if ( rc ) {
2260                 return rc;
2261         }
2262
2263         thrctx = ldap_pvt_thread_pool_context();
2264         connection_fake_init( &conn, op, thrctx );
2265         op->o_bd = be;
2266         op->o_dn = be->be_rootdn;
2267         op->o_ndn = be->be_rootndn;
2268
2269         ctxcsnbuf[0] = '\0';
2270
2271         op->o_bd->bd_info = on->on_info->oi_orig;
2272         rc = be_entry_get_rw( op, be->be_nsuffix, NULL,
2273                 slap_schema.si_ad_contextCSN, 0, &e );
2274
2275         if ( e ) {
2276                 ldap_pvt_thread_t tid;
2277
2278                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
2279                 if ( a ) {
2280                         si->si_ctxcsn.bv_len = a->a_nvals[0].bv_len;
2281                         if ( si->si_ctxcsn.bv_len >= sizeof(si->si_ctxcsnbuf ))
2282                                 si->si_ctxcsn.bv_len = sizeof(si->si_ctxcsnbuf)-1;
2283                         strncpy( si->si_ctxcsnbuf, a->a_nvals[0].bv_val,
2284                                 si->si_ctxcsn.bv_len );
2285                         si->si_ctxcsnbuf[si->si_ctxcsn.bv_len] = '\0';
2286                         strcpy( ctxcsnbuf, si->si_ctxcsnbuf );
2287                 }
2288                 be_entry_release_rw( op, e, 0 );
2289                 op->o_bd->bd_info = (BackendInfo *)on;
2290                 op->o_req_dn = be->be_suffix[0];
2291                 op->o_req_ndn = be->be_nsuffix[0];
2292                 op->ors_scope = LDAP_SCOPE_SUBTREE;
2293                 ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
2294                 ldap_pvt_thread_join( tid, NULL );
2295         } else if ( SLAP_SYNC_SHADOW( op->o_bd )) {
2296                 /* If we're also a consumer, and we didn't find the context entry,
2297                  * then don't generate anything, wait for our provider to send it
2298                  * to us.
2299                  */
2300                 goto out;
2301         }
2302
2303         if ( BER_BVISEMPTY( &si->si_ctxcsn ) ) {
2304                 si->si_ctxcsn.bv_len = sizeof( si->si_ctxcsnbuf );
2305                 slap_get_csn( op, &si->si_ctxcsn, 0 );
2306         }
2307
2308         /* If our ctxcsn is different from what was read from the root
2309          * entry, make sure we do a checkpoint on close
2310          */
2311         if ( strcmp( si->si_ctxcsnbuf, ctxcsnbuf )) {
2312                 si->si_numops++;
2313         }
2314
2315 out:
2316         op->o_bd->bd_info = (BackendInfo *)on;
2317         ldap_pvt_thread_pool_context_reset( thrctx );
2318         return 0;
2319 }
2320
2321 /* Write the current contextCSN into the underlying db.
2322  */
2323 static int
2324 syncprov_db_close(
2325     BackendDB *be
2326 )
2327 {
2328     slap_overinst   *on = (slap_overinst *) be->bd_info;
2329     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2330
2331         if ( slapMode & SLAP_TOOL_MODE ) {
2332                 return 0;
2333         }
2334         if ( si->si_numops ) {
2335                 Connection conn;
2336                 OperationBuffer opbuf;
2337                 Operation *op = (Operation *) &opbuf;
2338                 SlapReply rs = {REP_RESULT};
2339                 void *thrctx;
2340
2341                 thrctx = ldap_pvt_thread_pool_context();
2342                 connection_fake_init( &conn, op, thrctx );
2343                 op->o_bd = be;
2344                 op->o_dn = be->be_rootdn;
2345                 op->o_ndn = be->be_rootndn;
2346                 syncprov_checkpoint( op, &rs, on );
2347                 ldap_pvt_thread_pool_context_reset( thrctx );
2348         }
2349
2350     return 0;
2351 }
2352
2353 static int
2354 syncprov_db_init(
2355         BackendDB *be
2356 )
2357 {
2358         slap_overinst   *on = (slap_overinst *)be->bd_info;
2359         syncprov_info_t *si;
2360
2361         si = ch_calloc(1, sizeof(syncprov_info_t));
2362         on->on_bi.bi_private = si;
2363         ldap_pvt_thread_mutex_init( &si->si_csn_mutex );
2364         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
2365         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
2366         si->si_ctxcsn.bv_val = si->si_ctxcsnbuf;
2367
2368         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
2369         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
2370         csn_anlist[1].an_desc = slap_schema.si_ad_entryUUID;
2371         csn_anlist[1].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2372
2373         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
2374         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2375
2376         return 0;
2377 }
2378
2379 static int
2380 syncprov_db_destroy(
2381         BackendDB *be
2382 )
2383 {
2384         slap_overinst   *on = (slap_overinst *)be->bd_info;
2385         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2386
2387         if ( si ) {
2388                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
2389                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
2390                 ldap_pvt_thread_mutex_destroy( &si->si_csn_mutex );
2391                 ch_free( si );
2392         }
2393
2394         return 0;
2395 }
2396
2397 static int syncprov_parseCtrl (
2398         Operation *op,
2399         SlapReply *rs,
2400         LDAPControl *ctrl )
2401 {
2402         ber_tag_t tag;
2403         BerElementBuffer berbuf;
2404         BerElement *ber = (BerElement *)&berbuf;
2405         ber_int_t mode;
2406         ber_len_t len;
2407         struct berval cookie = BER_BVNULL;
2408         sync_control *sr;
2409         int rhint = 0;
2410
2411         if ( op->o_sync != SLAP_CONTROL_NONE ) {
2412                 rs->sr_text = "Sync control specified multiple times";
2413                 return LDAP_PROTOCOL_ERROR;
2414         }
2415
2416         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
2417                 rs->sr_text = "Sync control specified with pagedResults control";
2418                 return LDAP_PROTOCOL_ERROR;
2419         }
2420
2421         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
2422                 rs->sr_text = "Sync control value is empty (or absent)";
2423                 return LDAP_PROTOCOL_ERROR;
2424         }
2425
2426         /* Parse the control value
2427          *      syncRequestValue ::= SEQUENCE {
2428          *              mode   ENUMERATED {
2429          *                      -- 0 unused
2430          *                      refreshOnly             (1),
2431          *                      -- 2 reserved
2432          *                      refreshAndPersist       (3)
2433          *              },
2434          *              cookie  syncCookie OPTIONAL
2435          *      }
2436          */
2437
2438         ber_init2( ber, &ctrl->ldctl_value, 0 );
2439
2440         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
2441                 rs->sr_text = "Sync control : mode decoding error";
2442                 return LDAP_PROTOCOL_ERROR;
2443         }
2444
2445         switch( mode ) {
2446         case LDAP_SYNC_REFRESH_ONLY:
2447                 mode = SLAP_SYNC_REFRESH;
2448                 break;
2449         case LDAP_SYNC_REFRESH_AND_PERSIST:
2450                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
2451                 break;
2452         default:
2453                 rs->sr_text = "Sync control : unknown update mode";
2454                 return LDAP_PROTOCOL_ERROR;
2455         }
2456
2457         tag = ber_peek_tag( ber, &len );
2458
2459         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
2460                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
2461                         rs->sr_text = "Sync control : cookie decoding error";
2462                         return LDAP_PROTOCOL_ERROR;
2463                 }
2464                 tag = ber_peek_tag( ber, &len );
2465         }
2466         if ( tag == LDAP_TAG_RELOAD_HINT ) {
2467                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
2468                         rs->sr_text = "Sync control : rhint decoding error";
2469                         return LDAP_PROTOCOL_ERROR;
2470                 }
2471         }
2472         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
2473                         rs->sr_text = "Sync control : decoding error";
2474                         return LDAP_PROTOCOL_ERROR;
2475         }
2476         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
2477         sr->sr_rhint = rhint;
2478         if (!BER_BVISNULL(&cookie)) {
2479                 ber_dupbv_x( &sr->sr_state.octet_str, &cookie, op->o_tmpmemctx );
2480                 slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx );
2481                 if ( sr->sr_state.rid == -1 ) {
2482                         rs->sr_text = "Sync control : cookie parsing error";
2483                         return LDAP_PROTOCOL_ERROR;
2484                 }
2485         }
2486
2487         op->o_controls[slap_cids.sc_LDAPsync] = sr;
2488
2489         op->o_sync = ctrl->ldctl_iscritical
2490                 ? SLAP_CONTROL_CRITICAL
2491                 : SLAP_CONTROL_NONCRITICAL;
2492
2493         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
2494
2495         return LDAP_SUCCESS;
2496 }
2497
2498 /* This overlay is set up for dynamic loading via moduleload. For static
2499  * configuration, you'll need to arrange for the slap_overinst to be
2500  * initialized and registered by some other function inside slapd.
2501  */
2502
2503 static slap_overinst            syncprov;
2504
2505 int
2506 syncprov_init()
2507 {
2508         int rc;
2509
2510         rc = register_supported_control( LDAP_CONTROL_SYNC,
2511                 SLAP_CTRL_HIDE|SLAP_CTRL_SEARCH, NULL,
2512                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
2513         if ( rc != LDAP_SUCCESS ) {
2514                 Debug( LDAP_DEBUG_ANY,
2515                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
2516                 return rc;
2517         }
2518
2519         syncprov.on_bi.bi_type = "syncprov";
2520         syncprov.on_bi.bi_db_init = syncprov_db_init;
2521         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
2522         syncprov.on_bi.bi_db_open = syncprov_db_open;
2523         syncprov.on_bi.bi_db_close = syncprov_db_close;
2524
2525         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
2526         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
2527
2528         syncprov.on_bi.bi_op_add = syncprov_op_mod;
2529         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
2530         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
2531         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
2532         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
2533         syncprov.on_bi.bi_op_search = syncprov_op_search;
2534         syncprov.on_bi.bi_extended = syncprov_op_extended;
2535         syncprov.on_bi.bi_operational = syncprov_operational;
2536
2537         syncprov.on_bi.bi_cf_ocs = spocs;
2538
2539         generic_filter.f_desc = slap_schema.si_ad_objectClass;
2540
2541         rc = config_register_schema( spcfg, spocs );
2542         if ( rc ) return rc;
2543
2544         return overlay_register( &syncprov );
2545 }
2546
2547 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
2548 int
2549 init_module( int argc, char *argv[] )
2550 {
2551         return syncprov_init();
2552 }
2553 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
2554
2555 #endif /* defined(SLAPD_OVER_SYNCPROV) */