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,
 738         Entry **e, int mode )
 739 {
 740         slap_overinst *on = opc->son;
 741
 742         SlapReply rs = { REP_SEARCH };
 743         LDAPControl *ctrls[2];
 744         struct berval cookie;
 745         Entry e_uuid = {0};
 746         Attribute a_uuid = {0};
 747
 748         if ( so->s_op->o_abandon )
 749                 return SLAPD_ABANDON;
 750
 751         ctrls[1] = NULL;
 752         slap_compose_sync_cookie( op, &cookie, &opc->sctxcsn, so->s_rid );
 753
 754         e_uuid.e_attrs = &a_uuid;
 755         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 756         a_uuid.a_nvals = &opc->suuid;
 757         rs.sr_err = syncprov_state_ctrl( op, &rs, &e_uuid,
 758                 mode, ctrls, 0, 1, &cookie );
 759         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
 760
 761         rs.sr_ctrls = ctrls;
 762         op->o_bd->bd_info = (BackendInfo *)on->on_info;
 763         switch( mode ) {
 764         case LDAP_SYNC_ADD:
 765                 rs.sr_entry = *e;
 766                 if ( rs.sr_entry->e_private )
 767                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 768                 if ( opc->sreference ) {
 769                         rs.sr_ref = get_entry_referrals( op, rs.sr_entry );
 770                         send_search_reference( op, &rs );
 771                         ber_bvarray_free( rs.sr_ref );
 772                         if ( !rs.sr_entry )
 773                                 *e = NULL;
 774                         break;
 775                 }
 776                 /* fallthru */
 777         case LDAP_SYNC_MODIFY:
 778                 rs.sr_entry = *e;
 779                 if ( rs.sr_entry->e_private )
 780                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 781                 rs.sr_attrs = op->ors_attrs;
 782                 send_search_entry( op, &rs );
 783                 if ( !rs.sr_entry )
 784                         *e = NULL;
 785                 break;
 786         case LDAP_SYNC_DELETE:
 787                 e_uuid.e_attrs = NULL;
 788                 e_uuid.e_name = opc->sdn;
 789                 e_uuid.e_nname = opc->sndn;
 790                 rs.sr_entry = &e_uuid;
 791                 if ( opc->sreference ) {
 792                         struct berval bv = BER_BVNULL;
 793                         rs.sr_ref = &bv;
 794                         send_search_reference( op, &rs );
 795                 } else {
 796                         send_search_entry( op, &rs );
 797                 }
 798                 break;
 799         default:
 800                 assert(0);
 801         }
 802         /* In case someone else freed it already? */
 803         if ( rs.sr_ctrls ) {
 804                 op->o_tmpfree( rs.sr_ctrls[0], op->o_tmpmemctx );
 805                 rs.sr_ctrls = NULL;
 806         }
 807
 808         return rs.sr_err;
 809 }
 810
 811 /* Play back queued responses */
 812 static int
 813 syncprov_qplay( Operation *op, slap_overinst *on, syncops *so )
 814 {
 815         syncres *sr;
 816         Entry *e;
 817         opcookie opc;
 818         int rc;
 819
 820         opc.son = on;
 821         op->o_bd->bd_info = (BackendInfo *)on->on_info;
 822
 823         for (;;) {
 824                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 825                 sr = so->s_res;
 826                 if ( sr )
 827                         so->s_res = sr->s_next;
 828                 if ( !so->s_res )
 829                         so->s_restail = NULL;
 830                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 831
 832                 if ( !sr || so->s_op->o_abandon )
 833                         break;
 834
 835                 opc.sdn = sr->s_dn;
 836                 opc.sndn = sr->s_ndn;
 837                 opc.suuid = sr->s_uuid;
 838                 opc.sctxcsn = sr->s_csn;
 839                 opc.sreference = sr->s_isreference;
 840                 e = NULL;
 841
 842                 if ( sr->s_mode != LDAP_SYNC_DELETE ) {
 843                         rc = be_entry_get_rw( op, &opc.sndn, NULL, NULL, 0, &e );
 844                         if ( rc ) {
 845                                 ch_free( sr );
 846                                 continue;
 847                         }
 848                 }
 849                 rc = syncprov_sendresp( op, &opc, so, &e, sr->s_mode );
 850
 851                 if ( e ) {
 852                         be_entry_release_rw( op, e, 0 );
 853                 }
 854
 855                 ch_free( sr );
 856
 857                 if ( rc )
 858                         break;
 859         }
 860         op->o_bd->bd_info = (BackendInfo *)on;
 861         return rc;
 862 }
 863
 864 /* runqueue task for playing back queued responses */
 865 static void *
 866 syncprov_qtask( void *ctx, void *arg )
 867 {
 868         struct re_s *rtask = arg;
 869         syncops *so = rtask->arg;
 870         slap_overinst *on = so->s_op->o_private;
 871         OperationBuffer opbuf;
 872         Operation *op;
 873         BackendDB be;
 874
 875         op = (Operation *) &opbuf;
 876         *op = *so->s_op;
 877         op->o_hdr = (Opheader *)(op+1);
 878         op->o_controls = (void **)(op->o_hdr+1);
 879         memset( op->o_controls, 0, SLAP_MAX_CIDS * sizeof(void *));
 880
 881         *op->o_hdr = *so->s_op->o_hdr;
 882
 883         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx);
 884         op->o_tmpmfuncs = &slap_sl_mfuncs;
 885         op->o_threadctx = ctx;
 886
 887         /* syncprov_qplay expects a fake db */
 888         be = *so->s_op->o_bd;
 889         be.be_flags |= SLAP_DBFLAG_OVERLAY;
 890         op->o_bd = &be;
 891         op->o_private = NULL;
 892         op->o_callback = NULL;
 893
 894         syncprov_qplay( op, on, so );
 895
 896         /* decrement use count... */
 897         syncprov_free_syncop( so );
 898
 899         /* wait until we get explicitly scheduled again */
 900         ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
 901         ldap_pvt_runqueue_stoptask( &slapd_rq, so->s_qtask );
 902         ldap_pvt_runqueue_resched( &slapd_rq, so->s_qtask, 1 );
 903         ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
 904
 905         return NULL;
 906 }
 907
 908 /* Queue a persistent search response */
 909 static int
 910 syncprov_qresp( opcookie *opc, syncops *so, int mode )
 911 {
 912         syncres *sr;
 913
 914         sr = ch_malloc(sizeof(syncres) + opc->suuid.bv_len + 1 +
 915                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1 + opc->sctxcsn.bv_len + 1 );
 916         sr->s_next = NULL;
 917         sr->s_dn.bv_val = (char *)(sr + 1);
 918         sr->s_dn.bv_len = opc->sdn.bv_len;
 919         sr->s_mode = mode;
 920         sr->s_isreference = opc->sreference;
 921         sr->s_ndn.bv_val = lutil_strcopy( sr->s_dn.bv_val,
 922                  opc->sdn.bv_val ) + 1;
 923         sr->s_ndn.bv_len = opc->sndn.bv_len;
 924         sr->s_uuid.bv_val = lutil_strcopy( sr->s_ndn.bv_val,
 925                  opc->sndn.bv_val ) + 1;
 926         sr->s_uuid.bv_len = opc->suuid.bv_len;
 927         AC_MEMCPY( sr->s_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
 928         sr->s_csn.bv_val = sr->s_uuid.bv_val + sr->s_uuid.bv_len + 1;
 929         sr->s_csn.bv_len = opc->sctxcsn.bv_len;
 930         strcpy( sr->s_csn.bv_val, opc->sctxcsn.bv_val );
 931
 932         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 933         if ( !so->s_res ) {
 934                 so->s_res = sr;
 935         } else {
 936                 so->s_restail->s_next = sr;
 937         }
 938         so->s_restail = sr;
 939
 940         /* If the base of the psearch was modified, check it next time round */
 941         if ( so->s_flags & PS_WROTE_BASE ) {
 942                 so->s_flags ^= PS_WROTE_BASE;
 943                 so->s_flags |= PS_FIND_BASE;
 944         }
 945         if ( so->s_flags & PS_IS_DETACHED ) {
 946                 ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
 947                 if ( !so->s_qtask ) {
 948                         so->s_qtask = ldap_pvt_runqueue_insert( &slapd_rq, RUNQ_INTERVAL,
 949                                 syncprov_qtask, so, "syncprov_qtask",
 950                                 so->s_op->o_conn->c_peer_name.bv_val );
 951                         ++so->s_inuse;
 952                 } else {
 953                         if (!ldap_pvt_runqueue_isrunning( &slapd_rq, so->s_qtask ) &&
 954                                 !so->s_qtask->next_sched.tv_sec ) {
 955                                 so->s_qtask->interval.tv_sec = 0;
 956                                 ldap_pvt_runqueue_resched( &slapd_rq, so->s_qtask, 0 );
 957                                 so->s_qtask->interval.tv_sec = RUNQ_INTERVAL;
 958                                 ++so->s_inuse;
 959                         }
 960                 }
 961                 ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
 962         }
 963         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 964         return LDAP_SUCCESS;
 965 }
 966
 967 static int
 968 syncprov_drop_psearch( syncops *so, int lock )
 969 {
 970         if ( so->s_flags & PS_IS_DETACHED ) {
 971                 if ( lock )
 972                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
 973                 so->s_op->o_conn->c_n_ops_executing--;
 974                 so->s_op->o_conn->c_n_ops_completed++;
 975                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, slap_op,
 976                         o_next );
 977                 if ( lock )
 978                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
 979         }
 980         syncprov_free_syncop( so );
 981
 982         return 0;
 983 }
 984
 985 static int
 986 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
 987 {
 988         slap_callback *sc = op->o_callback;
 989         op->o_callback = sc->sc_next;
 990         syncprov_drop_psearch( op->o_callback->sc_private, 0 );
 991         op->o_tmpfree( sc, op->o_tmpmemctx );
 992         return 0;
 993 }
 994
 995 static int
 996 syncprov_op_abandon( Operation *op, SlapReply *rs )
 997 {
 998         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 999         syncprov_info_t         *si = on->on_bi.bi_private;
1000         syncops *so, *soprev;
1001
1002         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1003         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
1004                 soprev=so, so=so->s_next ) {
1005                 if ( so->s_op->o_connid == op->o_connid &&
1006                         so->s_op->o_msgid == op->orn_msgid ) {
1007                                 so->s_op->o_abandon = 1;
1008                                 soprev->s_next = so->s_next;
1009                                 break;
1010                 }
1011         }
1012         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1013         if ( so ) {
1014                 /* Is this really a Cancel exop? */
1015                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
1016                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
1017                         rs->sr_err = LDAP_CANCELLED;
1018                         send_ldap_result( so->s_op, rs );
1019                         if ( so->s_flags & PS_IS_DETACHED ) {
1020                                 slap_callback *cb;
1021                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
1022                                 cb->sc_cleanup = syncprov_ab_cleanup;
1023                                 cb->sc_next = op->o_callback;
1024                                 cb->sc_private = so;
1025                                 return SLAP_CB_CONTINUE;
1026                         }
1027                 }
1028                 syncprov_drop_psearch( so, 0 );
1029         }
1030         return SLAP_CB_CONTINUE;
1031 }
1032
1033 /* Find which persistent searches are affected by this operation */
1034 static void
1035 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
1036 {
1037         slap_overinst *on = opc->son;
1038         syncprov_info_t         *si = on->on_bi.bi_private;
1039
1040         fbase_cookie fc;
1041         syncops *ss, *sprev, *snext;
1042         Entry *e;
1043         Attribute *a;
1044         int rc;
1045         struct berval newdn;
1046         int freefdn = 0;
1047
1048         fc.fdn = &op->o_req_ndn;
1049         /* compute new DN */
1050         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1051                 struct berval pdn;
1052                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
1053                 else dnParent( fc.fdn, &pdn );
1054                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
1055                 fc.fdn = &newdn;
1056                 freefdn = 1;
1057         }
1058         if ( op->o_tag != LDAP_REQ_ADD ) {
1059                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
1060                 rc = be_entry_get_rw( op, fc.fdn, NULL, NULL, 0, &e );
1061                 /* If we're sending responses now, make a copy and unlock the DB */
1062                 if ( e && !saveit ) {
1063                         Entry *e2 = entry_dup( e );
1064                         be_entry_release_rw( op, e, 0 );
1065                         e = e2;
1066                 }
1067                 op->o_bd->bd_info = (BackendInfo *)on;
1068                 if ( rc ) return;
1069         } else {
1070                 e = op->ora_e;
1071         }
1072
1073         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1074                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1075                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1076                 opc->sreference = is_entry_referral( e );
1077                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1078                 if ( a )
1079                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1080         } else if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1081                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1082                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1083                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1084                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1085         }
1086
1087         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1088         for (ss = si->si_ops, sprev = (syncops *)&si->si_ops; ss;
1089                 sprev = ss, ss=snext)
1090         {
1091                 syncmatches *sm;
1092                 int found = 0;
1093
1094                 snext = ss->s_next;
1095                 /* validate base */
1096                 fc.fss = ss;
1097                 fc.fbase = 0;
1098                 fc.fscope = 0;
1099
1100                 /* If the base of the search is missing, signal a refresh */
1101                 rc = syncprov_findbase( op, &fc );
1102                 if ( rc != LDAP_SUCCESS ) {
1103                         SlapReply rs = {REP_RESULT};
1104                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1105                                 "search base has changed" );
1106                         sprev->s_next = snext;
1107                         syncprov_drop_psearch( ss, 1 );
1108                         ss = sprev;
1109                         continue;
1110                 }
1111
1112
1113                 /* If we're sending results now, look for this op in old matches */
1114                 if ( !saveit ) {
1115                         syncmatches *old;
1116
1117                         /* Did we modify the search base? */
1118                         if ( dn_match( &op->o_req_ndn, &ss->s_base )) {
1119                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1120                                 ss->s_flags |= PS_WROTE_BASE;
1121                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1122                         }
1123
1124                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1125                                 old=sm, sm=sm->sm_next ) {
1126                                 if ( sm->sm_op == ss ) {
1127                                         found = 1;
1128                                         old->sm_next = sm->sm_next;
1129                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1130                                         break;
1131                                 }
1132                         }
1133                 }
1134
1135                 /* check if current o_req_dn is in scope and matches filter */
1136                 if ( fc.fscope && test_filter( op, e, ss->s_op->ors_filter ) ==
1137                         LDAP_COMPARE_TRUE ) {
1138                         if ( saveit ) {
1139                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1140                                 sm->sm_next = opc->smatches;
1141                                 sm->sm_op = ss;
1142                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1143                                 ++ss->s_inuse;
1144                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1145                                 opc->smatches = sm;
1146                         } else {
1147                                 /* if found send UPDATE else send ADD */
1148                                 syncprov_qresp( opc, ss,
1149                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD );
1150                         }
1151                 } else if ( !saveit && found ) {
1152                         /* send DELETE */
1153                         syncprov_qresp( opc, ss, LDAP_SYNC_DELETE );
1154                 }
1155         }
1156         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1157
1158         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1159                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
1160                 be_entry_release_rw( op, e, 0 );
1161                 op->o_bd->bd_info = (BackendInfo *)on;
1162         }
1163         if ( freefdn ) {
1164                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1165         }
1166 }
1167
1168 static int
1169 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1170 {
1171         slap_callback *cb = op->o_callback;
1172         opcookie *opc = cb->sc_private;
1173         slap_overinst *on = opc->son;
1174         syncprov_info_t         *si = on->on_bi.bi_private;
1175         syncmatches *sm, *snext;
1176         modtarget *mt, mtdummy;
1177
1178         for (sm = opc->smatches; sm; sm=snext) {
1179                 snext = sm->sm_next;
1180                 syncprov_free_syncop( sm->sm_op );
1181                 op->o_tmpfree( sm, op->o_tmpmemctx );
1182         }
1183
1184         /* Remove op from lock table */
1185         mtdummy.mt_op = op;
1186         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1187         mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1188         if ( mt ) {
1189                 modinst *mi = mt->mt_mods;
1190
1191                 /* If there are more, promote the next one */
1192                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1193                 if ( mi->mi_next ) {
1194                         mt->mt_mods = mi->mi_next;
1195                         mt->mt_op = mt->mt_mods->mi_op;
1196                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1197                 } else {
1198                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1199                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1200                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1201                         ch_free( mt );
1202                 }
1203         }
1204         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1205         if ( !BER_BVISNULL( &opc->suuid ))
1206                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1207         if ( !BER_BVISNULL( &opc->sndn ))
1208                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1209         if ( !BER_BVISNULL( &opc->sdn ))
1210                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1211         op->o_callback = cb->sc_next;
1212         op->o_tmpfree(cb, op->o_tmpmemctx);
1213
1214         return 0;
1215 }
1216
1217 static void
1218 syncprov_checkpoint( Operation *op, SlapReply *rs, slap_overinst *on )
1219 {
1220         syncprov_info_t         *si = on->on_bi.bi_private;
1221         Modifications mod;
1222         Operation opm;
1223         struct berval bv[2];
1224         slap_callback cb = {0};
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         if ( mod.sml_next != NULL ) {
1246                 slap_mods_free( mod.sml_next, 1 );
1247         }
1248 }
1249
1250 static void
1251 syncprov_add_slog( Operation *op, struct berval *csn )
1252 {
1253         opcookie *opc = op->o_callback->sc_private;
1254         slap_overinst *on = opc->son;
1255         syncprov_info_t         *si = on->on_bi.bi_private;
1256         sessionlog *sl;
1257         slog_entry *se;
1258
1259         sl = si->si_logs;
1260         {
1261                 /* Allocate a record. UUIDs are not NUL-terminated. */
1262                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1263                         csn->bv_len + 1 );
1264                 se->se_next = NULL;
1265                 se->se_tag = op->o_tag;
1266
1267                 se->se_uuid.bv_val = (char *)(se+1);
1268                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1269                 se->se_uuid.bv_len = opc->suuid.bv_len;
1270
1271                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1272                 AC_MEMCPY( se->se_csn.bv_val, csn->bv_val, csn->bv_len );
1273                 se->se_csn.bv_val[csn->bv_len] = '\0';
1274                 se->se_csn.bv_len = csn->bv_len;
1275
1276                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1277                 if ( sl->sl_head ) {
1278                         sl->sl_tail->se_next = se;
1279                 } else {
1280                         sl->sl_head = se;
1281                 }
1282                 sl->sl_tail = se;
1283                 sl->sl_num++;
1284                 while ( sl->sl_num > sl->sl_size ) {
1285                         se = sl->sl_head;
1286                         sl->sl_head = se->se_next;
1287                         strcpy( sl->sl_mincsn.bv_val, se->se_csn.bv_val );
1288                         sl->sl_mincsn.bv_len = se->se_csn.bv_len;
1289                         ch_free( se );
1290                         sl->sl_num--;
1291                         if ( !sl->sl_head ) {
1292                                 sl->sl_tail = NULL;
1293                         }
1294                 }
1295                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1296         }
1297 }
1298
1299 /* Just set a flag if we found the matching entry */
1300 static int
1301 playlog_cb( Operation *op, SlapReply *rs )
1302 {
1303         if ( rs->sr_type == REP_SEARCH ) {
1304                 op->o_callback->sc_private = (void *)1;
1305         }
1306         return rs->sr_err;
1307 }
1308
1309 /* enter with sl->sl_mutex locked, release before returning */
1310 static void
1311 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1312         struct berval *oldcsn, struct berval *ctxcsn )
1313 {
1314         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1315         slog_entry *se;
1316         int i, j, ndel, num, nmods, mmods;
1317         BerVarray uuids;
1318
1319         if ( !sl->sl_num ) {
1320                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1321                 return;
1322         }
1323
1324         num = sl->sl_num;
1325         i = 0;
1326         nmods = 0;
1327
1328         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1329                 num * UUID_LEN, op->o_tmpmemctx );
1330
1331         uuids[0].bv_val = (char *)(uuids + num + 1);
1332
1333         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1334          * and everything else at the end. Do this first so we can
1335          * unlock the list mutex.
1336          */
1337         for ( se=sl->sl_head; se; se=se->se_next ) {
1338                 if ( ber_bvcmp( &se->se_csn, oldcsn ) < 0 ) continue;
1339                 if ( ber_bvcmp( &se->se_csn, ctxcsn ) > 0 ) break;
1340                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1341                         j = i;
1342                         i++;
1343                 } else {
1344                         nmods++;
1345                         j = num - nmods;
1346                 }
1347                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1348                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1349                 uuids[j].bv_len = UUID_LEN;
1350         }
1351         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1352
1353         ndel = i;
1354
1355         /* Zero out unused slots */
1356         for ( i=ndel; i < num - nmods; i++ )
1357                 uuids[i].bv_len = 0;
1358
1359         /* Mods must be validated to see if they belong in this delete set.
1360          */
1361
1362         mmods = nmods;
1363         /* Strip any duplicates */
1364         for ( i=0; i<nmods; i++ ) {
1365                 for ( j=0; j<ndel; j++ ) {
1366                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1367                                 uuids[num - 1 - i].bv_len = 0;
1368                                 mmods --;
1369                                 break;
1370                         }
1371                 }
1372                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1373                 for ( j=0; j<i; j++ ) {
1374                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1375                                 uuids[num - 1 - i].bv_len = 0;
1376                                 mmods --;
1377                                 break;
1378                         }
1379                 }
1380         }
1381
1382         if ( mmods ) {
1383                 Operation fop;
1384                 SlapReply frs = { REP_RESULT };
1385                 int rc;
1386                 Filter mf, af;
1387 #ifdef LDAP_COMP_MATCH
1388                 AttributeAssertion eq = { NULL, BER_BVNULL, NULL };
1389 #else
1390                 AttributeAssertion eq;
1391 #endif
1392                 slap_callback cb = {0};
1393
1394                 fop = *op;
1395
1396                 fop.o_sync_mode = 0;
1397                 fop.o_callback = &cb;
1398                 fop.ors_limit = NULL;
1399                 fop.ors_tlimit = SLAP_NO_LIMIT;
1400                 fop.ors_attrs = slap_anlist_all_attributes;
1401                 fop.ors_attrsonly = 0;
1402                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1403
1404                 af.f_choice = LDAP_FILTER_AND;
1405                 af.f_next = NULL;
1406                 af.f_and = &mf;
1407                 mf.f_choice = LDAP_FILTER_EQUALITY;
1408                 mf.f_ava = &eq;
1409                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1410                 mf.f_next = fop.ors_filter;
1411
1412                 fop.ors_filter = &af;
1413
1414                 cb.sc_response = playlog_cb;
1415                 fop.o_bd->bd_info = on->on_info->oi_orig;
1416
1417                 for ( i=ndel; i<num; i++ ) {
1418                         if ( uuids[i].bv_len == 0 ) continue;
1419
1420                         mf.f_av_value = uuids[i];
1421                         cb.sc_private = NULL;
1422                         fop.ors_slimit = 1;
1423                         rc = fop.o_bd->be_search( &fop, &frs );
1424
1425                         /* If entry was not found, add to delete list */
1426                         if ( !cb.sc_private ) {
1427                                 uuids[ndel++] = uuids[i];
1428                         }
1429                 }
1430                 fop.o_bd->bd_info = (BackendInfo *)on;
1431         }
1432         if ( ndel ) {
1433                 uuids[ndel].bv_val = NULL;
1434                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL, 0, uuids, 1 );
1435         }
1436 }
1437
1438 static int
1439 syncprov_op_response( Operation *op, SlapReply *rs )
1440 {
1441         opcookie *opc = op->o_callback->sc_private;
1442         slap_overinst *on = opc->son;
1443         syncprov_info_t         *si = on->on_bi.bi_private;
1444         syncmatches *sm;
1445
1446         if ( rs->sr_err == LDAP_SUCCESS )
1447         {
1448                 struct berval maxcsn = BER_BVNULL, curcsn = BER_BVNULL;
1449                 char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1450
1451                 /* Update our context CSN */
1452                 cbuf[0] = '\0';
1453                 ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1454                 slap_get_commit_csn( op, &maxcsn, &curcsn );
1455                 if ( !BER_BVISNULL( &maxcsn ) ) {
1456                         strcpy( cbuf, maxcsn.bv_val );
1457                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn ) > 0 ) {
1458                                 strcpy( si->si_ctxcsnbuf, cbuf );
1459                                 si->si_ctxcsn.bv_len = maxcsn.bv_len;
1460                         }
1461                 }
1462
1463                 /* Don't do any processing for consumer contextCSN updates */
1464                 if ( SLAP_SYNC_SHADOW( op->o_bd ) &&
1465                         op->o_msgid == SLAP_SYNC_UPDATE_MSGID ) {
1466                         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1467                         return SLAP_CB_CONTINUE;
1468                 }
1469
1470                 si->si_numops++;
1471                 if ( si->si_chkops || si->si_chktime ) {
1472                         int do_check=0;
1473                         if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1474                                 do_check = 1;
1475                                 si->si_numops = 0;
1476                         }
1477                         if ( si->si_chktime &&
1478                                 (op->o_time - si->si_chklast >= si->si_chktime )) {
1479                                 do_check = 1;
1480                                 si->si_chklast = op->o_time;
1481                         }
1482                         if ( do_check ) {
1483                                 syncprov_checkpoint( op, rs, on );
1484                         }
1485                 }
1486                 ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1487
1488                 opc->sctxcsn.bv_len = maxcsn.bv_len;
1489                 opc->sctxcsn.bv_val = cbuf;
1490
1491                 /* Handle any persistent searches */
1492                 if ( si->si_ops ) {
1493                         switch(op->o_tag) {
1494                         case LDAP_REQ_ADD:
1495                         case LDAP_REQ_MODIFY:
1496                         case LDAP_REQ_MODRDN:
1497                         case LDAP_REQ_EXTENDED:
1498                                 syncprov_matchops( op, opc, 0 );
1499                                 break;
1500                         case LDAP_REQ_DELETE:
1501                                 /* for each match in opc->smatches:
1502                                  *   send DELETE msg
1503                                  */
1504                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1505                                         if ( sm->sm_op->s_op->o_abandon )
1506                                                 continue;
1507                                         syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_DELETE );
1508                                 }
1509                                 break;
1510                         }
1511                 }
1512
1513                 /* Add any log records */
1514                 if ( si->si_logs && op->o_tag != LDAP_REQ_ADD ) {
1515                         syncprov_add_slog( op, &curcsn );
1516                 }
1517
1518         }
1519         return SLAP_CB_CONTINUE;
1520 }
1521
1522 /* We don't use a subentry to store the context CSN any more.
1523  * We expose the current context CSN as an operational attribute
1524  * of the suffix entry.
1525  */
1526 static int
1527 syncprov_op_compare( Operation *op, SlapReply *rs )
1528 {
1529         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1530         syncprov_info_t         *si = on->on_bi.bi_private;
1531         int rc = SLAP_CB_CONTINUE;
1532
1533         if ( dn_match( &op->o_req_ndn, op->o_bd->be_nsuffix ) &&
1534                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1535         {
1536                 Entry e = {0};
1537                 Attribute a = {0};
1538                 struct berval bv[2];
1539
1540                 e.e_name = op->o_bd->be_suffix[0];
1541                 e.e_nname = op->o_bd->be_nsuffix[0];
1542
1543                 BER_BVZERO( &bv[1] );
1544                 bv[0] = si->si_ctxcsn;
1545
1546                 a.a_desc = slap_schema.si_ad_contextCSN;
1547                 a.a_vals = bv;
1548                 a.a_nvals = a.a_vals;
1549
1550                 ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1551
1552                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1553                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1554                 if ( ! rs->sr_err ) {
1555                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1556                         goto return_results;
1557                 }
1558
1559                 if ( get_assert( op ) &&
1560                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
1561                 {
1562                         rs->sr_err = LDAP_ASSERTION_FAILED;
1563                         goto return_results;
1564                 }
1565
1566
1567                 rs->sr_err = LDAP_COMPARE_FALSE;
1568
1569                 if ( value_find_ex( op->oq_compare.rs_ava->aa_desc,
1570                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
1571                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
1572                                 a.a_nvals, &op->oq_compare.rs_ava->aa_value, op->o_tmpmemctx ) == 0 )
1573                 {
1574                         rs->sr_err = LDAP_COMPARE_TRUE;
1575                 }
1576
1577 return_results:;
1578
1579                 ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1580
1581                 send_ldap_result( op, rs );
1582
1583                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
1584                         rs->sr_err = LDAP_SUCCESS;
1585                 }
1586                 rc = rs->sr_err;
1587         }
1588
1589         return rc;
1590 }
1591
1592 static int
1593 syncprov_op_mod( Operation *op, SlapReply *rs )
1594 {
1595         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1596         syncprov_info_t         *si = on->on_bi.bi_private;
1597
1598         slap_callback *cb = op->o_tmpcalloc(1, sizeof(slap_callback)+
1599                 sizeof(opcookie) +
1600                 (si->si_ops ? sizeof(modinst) : 0 ),
1601                 op->o_tmpmemctx);
1602         opcookie *opc = (opcookie *)(cb+1);
1603         opc->son = on;
1604         cb->sc_response = syncprov_op_response;
1605         cb->sc_cleanup = syncprov_op_cleanup;
1606         cb->sc_private = opc;
1607         cb->sc_next = op->o_callback;
1608         op->o_callback = cb;
1609
1610         /* If there are active persistent searches, lock this operation.
1611          * See seqmod.c for the locking logic on its own.
1612          */
1613         if ( si->si_ops ) {
1614                 modtarget *mt, mtdummy;
1615                 modinst *mi;
1616
1617                 mi = (modinst *)(opc+1);
1618                 mi->mi_op = op;
1619
1620                 /* See if we're already modifying this entry... */
1621                 mtdummy.mt_op = op;
1622                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1623                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1624                 if ( mt ) {
1625                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1626                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1627                         mt->mt_tail->mi_next = mi;
1628                         mt->mt_tail = mi;
1629                         /* wait for this op to get to head of list */
1630                         while ( mt->mt_mods != mi ) {
1631                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1632                                 ldap_pvt_thread_yield();
1633                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1634
1635                                 /* clean up if the caller is giving up */
1636                                 if ( op->o_abandon ) {
1637                                         modinst *m2;
1638                                         for ( m2 = mt->mt_mods; m2->mi_next != mi;
1639                                                 m2 = m2->mi_next );
1640                                         m2->mi_next = mi->mi_next;
1641                                         if ( mt->mt_tail == mi ) mt->mt_tail = m2;
1642                                         op->o_tmpfree( cb, op->o_tmpmemctx );
1643                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1644                                         return SLAPD_ABANDON;
1645                                 }
1646                         }
1647                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1648                 } else {
1649                         /* Record that we're modifying this entry now */
1650                         mt = ch_malloc( sizeof(modtarget) );
1651                         mt->mt_mods = mi;
1652                         mt->mt_tail = mi;
1653                         mt->mt_op = mi->mi_op;
1654                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
1655                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
1656                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1657                 }
1658         }
1659
1660         if (( si->si_ops || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
1661                 syncprov_matchops( op, opc, 1 );
1662
1663         return SLAP_CB_CONTINUE;
1664 }
1665
1666 static int
1667 syncprov_op_extended( Operation *op, SlapReply *rs )
1668 {
1669         if ( exop_is_write( op ))
1670                 return syncprov_op_mod( op, rs );
1671
1672         return SLAP_CB_CONTINUE;
1673 }
1674
1675 typedef struct searchstate {
1676         slap_overinst *ss_on;
1677         syncops *ss_so;
1678         int ss_present;
1679         struct berval ss_ctxcsn;
1680         char ss_csnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1681 } searchstate;
1682
1683 static int
1684 syncprov_search_cleanup( Operation *op, SlapReply *rs )
1685 {
1686         if ( rs->sr_ctrls ) {
1687                 op->o_tmpfree( rs->sr_ctrls[0], op->o_tmpmemctx );
1688                 op->o_tmpfree( rs->sr_ctrls, op->o_tmpmemctx );
1689                 rs->sr_ctrls = NULL;
1690         }
1691         return 0;
1692 }
1693
1694 static void
1695 syncprov_detach_op( Operation *op, syncops *so, slap_overinst *on )
1696 {
1697         Operation *op2;
1698         int i, alen = 0;
1699         size_t size;
1700         char *ptr;
1701         GroupAssertion *g1, *g2;
1702
1703         /* count the search attrs */
1704         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1705                 alen += op->ors_attrs[i].an_name.bv_len + 1;
1706         }
1707         /* Make a new copy of the operation */
1708         size = sizeof(Operation) + sizeof(Opheader) +
1709                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
1710                 op->o_req_dn.bv_len + 1 +
1711                 op->o_req_ndn.bv_len + 1 +
1712                 op->o_ndn.bv_len + 1 +
1713                 so->s_filterstr.bv_len + 1;
1714         op2 = (Operation *)ch_calloc( 1, size );
1715         op2->o_hdr = (Opheader *)(op2+1);
1716
1717         /* Copy the fields we care about explicitly, leave the rest alone */
1718         *op2->o_hdr = *op->o_hdr;
1719         op2->o_tag = op->o_tag;
1720         op2->o_time = op->o_time;
1721         op2->o_bd = on->on_info->oi_origdb;
1722         op2->o_request = op->o_request;
1723         op2->o_private = on;
1724
1725         if ( i ) {
1726                 op2->ors_attrs = (AttributeName *)(op2->o_hdr + 1);
1727                 ptr = (char *)(op2->ors_attrs+i+1);
1728                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1729                         op2->ors_attrs[i] = op->ors_attrs[i];
1730                         op2->ors_attrs[i].an_name.bv_val = ptr;
1731                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
1732                 }
1733                 BER_BVZERO( &op2->ors_attrs[i].an_name );
1734         } else {
1735                 ptr = (char *)(op2->o_hdr + 1);
1736         }
1737         op2->o_authz = op->o_authz;
1738         op2->o_ndn.bv_val = ptr;
1739         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
1740         op2->o_dn = op2->o_ndn;
1741         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
1742         op2->o_req_dn.bv_val = ptr;
1743         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
1744         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
1745         op2->o_req_ndn.bv_val = ptr;
1746         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
1747         op2->ors_filterstr.bv_val = ptr;
1748         strcpy( ptr, so->s_filterstr.bv_val );
1749         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
1750         op2->ors_filter = str2filter( ptr );
1751         so->s_op = op2;
1752
1753         /* Copy any cached group ACLs individually */
1754         op2->o_groups = NULL;
1755         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
1756                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
1757                 *g2 = *g1;
1758                 strcpy( g2->ga_ndn, g1->ga_ndn );
1759                 g2->ga_next = op2->o_groups;
1760                 op2->o_groups = g2;
1761         }
1762         /* Don't allow any further group caching */
1763         op2->o_do_not_cache = 1;
1764
1765         /* Add op2 to conn so abandon will find us */
1766         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
1767         op->o_conn->c_n_ops_executing++;
1768         op->o_conn->c_n_ops_completed--;
1769         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
1770         so->s_flags |= PS_IS_DETACHED;
1771         ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
1772 }
1773
1774 static int
1775 syncprov_search_response( Operation *op, SlapReply *rs )
1776 {
1777         searchstate *ss = op->o_callback->sc_private;
1778         slap_overinst *on = ss->ss_on;
1779         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
1780
1781         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
1782                 Attribute *a;
1783                 /* If we got a referral without a referral object, there's
1784                  * something missing that we cannot replicate. Just ignore it.
1785                  * The consumer will abort because we didn't send the expected
1786                  * control.
1787                  */
1788                 if ( !rs->sr_entry ) {
1789                         assert( rs->sr_entry != NULL );
1790                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
1791                         return SLAP_CB_CONTINUE;
1792                 }
1793                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryCSN );
1794                 if ( a ) {
1795                         /* Make sure entry is less than the snaphot'd contextCSN */
1796                         if ( ber_bvcmp( &a->a_nvals[0], &ss->ss_ctxcsn ) > 0 )
1797                                 return LDAP_SUCCESS;
1798
1799                         /* Don't send the ctx entry twice */
1800                         if ( !BER_BVISNULL( &srs->sr_state.ctxcsn ) &&
1801                                 bvmatch( &a->a_nvals[0], &srs->sr_state.ctxcsn ) )
1802                                 return LDAP_SUCCESS;
1803                 }
1804                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1805                         op->o_tmpmemctx );
1806                 rs->sr_ctrls[1] = NULL;
1807                 rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
1808                         LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
1809         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
1810                 struct berval cookie;
1811
1812                 slap_compose_sync_cookie( op, &cookie, &ss->ss_ctxcsn,
1813                         srs->sr_state.rid );
1814
1815                 /* Is this a regular refresh? */
1816                 if ( !ss->ss_so ) {
1817                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1818                                 op->o_tmpmemctx );
1819                         rs->sr_ctrls[1] = NULL;
1820                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
1821                                 0, 1, &cookie, ss->ss_present ?  LDAP_SYNC_REFRESH_PRESENTS :
1822                                         LDAP_SYNC_REFRESH_DELETES );
1823                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1824                 } else {
1825                 /* It's RefreshAndPersist, transition to Persist phase */
1826                         syncprov_sendinfo( op, rs, ( ss->ss_present && rs->sr_nentries ) ?
1827                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
1828                                 &cookie, 1, NULL, 0 );
1829                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1830
1831                         /* Detach this Op from frontend control */
1832                         ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
1833
1834                         /* Turn off the refreshing flag */
1835                         ss->ss_so->s_flags ^= PS_IS_REFRESHING;
1836
1837                         syncprov_detach_op( op, ss->ss_so, on );
1838                         ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
1839
1840                         return LDAP_SUCCESS;
1841                 }
1842         }
1843
1844         return SLAP_CB_CONTINUE;
1845 }
1846
1847 static int
1848 syncprov_op_search( Operation *op, SlapReply *rs )
1849 {
1850         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1851         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
1852         slap_callback   *cb;
1853         int gotstate = 0, nochange = 0, do_present;
1854         syncops *sop = NULL;
1855         searchstate *ss;
1856         sync_control *srs;
1857         struct berval ctxcsn;
1858         char csnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1859
1860         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
1861
1862         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
1863                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
1864                 return rs->sr_err;
1865         }
1866
1867         do_present = si->si_nopres ? 0 : 1;
1868
1869         srs = op->o_controls[slap_cids.sc_LDAPsync];
1870         op->o_managedsait = SLAP_CONTROL_NONCRITICAL;
1871
1872         /* If this is a persistent search, set it up right away */
1873         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
1874                 syncops so = {0};
1875                 fbase_cookie fc;
1876                 opcookie opc;
1877                 slap_callback sc;
1878
1879                 fc.fss = &so;
1880                 fc.fbase = 0;
1881                 so.s_eid = NOID;
1882                 so.s_op = op;
1883                 so.s_flags = PS_IS_REFRESHING | PS_FIND_BASE;
1884                 /* syncprov_findbase expects to be called as a callback... */
1885                 sc.sc_private = &opc;
1886                 opc.son = on;
1887                 cb = op->o_callback;
1888                 op->o_callback = &sc;
1889                 rs->sr_err = syncprov_findbase( op, &fc );
1890                 op->o_callback = cb;
1891
1892                 if ( rs->sr_err != LDAP_SUCCESS ) {
1893                         send_ldap_result( op, rs );
1894                         return rs->sr_err;
1895                 }
1896                 sop = ch_malloc( sizeof( syncops ));
1897                 *sop = so;
1898                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
1899                 sop->s_rid = srs->sr_state.rid;
1900                 sop->s_inuse = 1;
1901
1902                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1903                 sop->s_next = si->si_ops;
1904                 si->si_ops = sop;
1905                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1906         }
1907
1908         /* snapshot the ctxcsn */
1909         ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1910         strcpy( csnbuf, si->si_ctxcsnbuf );
1911         ctxcsn.bv_len = si->si_ctxcsn.bv_len;
1912         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1913         ctxcsn.bv_val = csnbuf;
1914
1915         /* If we have a cookie, handle the PRESENT lookups */
1916         if ( !BER_BVISNULL( &srs->sr_state.ctxcsn )) {
1917                 sessionlog *sl;
1918
1919                 /* The cookie was validated when it was parsed, just use it */
1920
1921                 /* If just Refreshing and nothing has changed, shortcut it */
1922                 if ( bvmatch( &srs->sr_state.ctxcsn, &ctxcsn )) {
1923                         nochange = 1;
1924                         if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
1925                                 LDAPControl     *ctrls[2];
1926
1927                                 ctrls[0] = NULL;
1928                                 ctrls[1] = NULL;
1929                                 syncprov_done_ctrl( op, rs, ctrls, 0, 0,
1930                                         NULL, LDAP_SYNC_REFRESH_DELETES );
1931                                 rs->sr_ctrls = ctrls;
1932                                 rs->sr_err = LDAP_SUCCESS;
1933                                 send_ldap_result( op, rs );
1934                                 rs->sr_ctrls = NULL;
1935                                 return rs->sr_err;
1936                         }
1937                         goto shortcut;
1938                 }
1939                 /* Do we have a sessionlog for this search? */
1940                 sl=si->si_logs;
1941                 if ( sl ) {
1942                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1943                         if ( ber_bvcmp( &srs->sr_state.ctxcsn, &sl->sl_mincsn ) >= 0 ) {
1944                                 do_present = 0;
1945                                 /* mutex is unlocked in playlog */
1946                                 syncprov_playlog( op, rs, sl, &srs->sr_state.ctxcsn, &ctxcsn );
1947                         } else {
1948                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1949                         }
1950                 }
1951                 /* Is the CSN still present in the database? */
1952                 if ( syncprov_findcsn( op, FIND_CSN ) != LDAP_SUCCESS ) {
1953                         /* No, so a reload is required */
1954                         /* the 2.2 consumer doesn't send this hint */
1955                         if ( si->si_usehint && srs->sr_rhint == 0 ) {
1956                                 send_ldap_error( op, rs, LDAP_SYNC_REFRESH_REQUIRED, "sync cookie is stale" );
1957                                 return rs->sr_err;
1958                         }
1959                 } else {
1960                         gotstate = 1;
1961                         /* If changed and doing Present lookup, send Present UUIDs */
1962                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT ) !=
1963                                 LDAP_SUCCESS ) {
1964                                 send_ldap_result( op, rs );
1965                                 return rs->sr_err;
1966                         }
1967                 }
1968         }
1969
1970 shortcut:
1971         /* Append CSN range to search filter, save original filter
1972          * for persistent search evaluation
1973          */
1974         if ( sop ) {
1975                 sop->s_filterstr= op->ors_filterstr;
1976         }
1977
1978         /* If something changed, find the changes */
1979         if ( gotstate && !nochange ) {
1980                 Filter *fand, *fava;
1981
1982                 fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
1983                 fand->f_choice = LDAP_FILTER_AND;
1984                 fand->f_next = NULL;
1985                 fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
1986                 fand->f_and = fava;
1987                 fava->f_choice = LDAP_FILTER_GE;
1988                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
1989                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
1990 #ifdef LDAP_COMP_MATCH
1991                 fava->f_ava->aa_cf = NULL;
1992 #endif
1993                 ber_dupbv_x( &fava->f_ava->aa_value, &srs->sr_state.ctxcsn, op->o_tmpmemctx );
1994                 fava->f_next = op->ors_filter;
1995                 op->ors_filter = fand;
1996                 filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
1997         }
1998
1999         /* Let our callback add needed info to returned entries */
2000         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
2001         ss = (searchstate *)(cb+1);
2002         ss->ss_on = on;
2003         ss->ss_so = sop;
2004         ss->ss_present = do_present;
2005         ss->ss_ctxcsn.bv_len = ctxcsn.bv_len;
2006         ss->ss_ctxcsn.bv_val = ss->ss_csnbuf;
2007         strcpy( ss->ss_ctxcsn.bv_val, ctxcsn.bv_val );
2008         cb->sc_response = syncprov_search_response;
2009         cb->sc_cleanup = syncprov_search_cleanup;
2010         cb->sc_private = ss;
2011         cb->sc_next = op->o_callback;
2012         op->o_callback = cb;
2013
2014 #if 0   /* I don't think we need to shortcircuit back-bdb any more */
2015         op->o_sync_mode &= SLAP_CONTROL_MASK;
2016 #endif
2017
2018         /* If this is a persistent search and no changes were reported during
2019          * the refresh phase, just invoke the response callback to transition
2020          * us into persist phase
2021          */
2022         if ( nochange ) {
2023                 rs->sr_err = LDAP_SUCCESS;
2024                 rs->sr_nentries = 0;
2025                 send_ldap_result( op, rs );
2026                 return rs->sr_err;
2027         }
2028         return SLAP_CB_CONTINUE;
2029 }
2030
2031 static int
2032 syncprov_operational(
2033         Operation *op,
2034         SlapReply *rs )
2035 {
2036         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2037         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2038
2039         if ( rs->sr_entry &&
2040                 dn_match( &rs->sr_entry->e_nname, op->o_bd->be_nsuffix )) {
2041
2042                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
2043                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
2044                         Attribute *a, **ap = NULL;
2045
2046                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
2047                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
2048                                         break;
2049                         }
2050
2051                         if ( !a ) {
2052                                 for ( ap = &rs->sr_operational_attrs; *ap; ap=&(*ap)->a_next );
2053
2054                                 a = ch_malloc( sizeof(Attribute));
2055                                 a->a_desc = slap_schema.si_ad_contextCSN;
2056                                 a->a_vals = ch_malloc( 2 * sizeof(struct berval));
2057                                 a->a_vals[1].bv_val = NULL;
2058                                 a->a_nvals = a->a_vals;
2059                                 a->a_next = NULL;
2060                                 a->a_flags = 0;
2061                                 *ap = a;
2062                         }
2063
2064                         ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
2065                         if ( !ap ) {
2066                                 strcpy( a->a_vals[0].bv_val, si->si_ctxcsnbuf );
2067                         } else {
2068                                 ber_dupbv( &a->a_vals[0], &si->si_ctxcsn );
2069                         }
2070                         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
2071                 }
2072         }
2073         return SLAP_CB_CONTINUE;
2074 }
2075
2076 enum {
2077         SP_CHKPT = 1,
2078         SP_SESSL,
2079         SP_NOPRES,
2080         SP_USEHINT
2081 };
2082
2083 static ConfigDriver sp_cf_gen;
2084
2085 static ConfigTable spcfg[] = {
2086         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2087                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2088                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2089                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2090         { "syncprov-sessionlog", "ops", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2091                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2092                         "DESC 'Session log size in ops' "
2093                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2094         { "syncprov-nopresent", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_NOPRES,
2095                 sp_cf_gen, "( OLcfgOvAt:1.3 NAME 'olcSpNoPresent' "
2096                         "DESC 'Omit Present phase processing' "
2097                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2098         { "syncprov-reloadhint", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_USEHINT,
2099                 sp_cf_gen, "( OLcfgOvAt:1.4 NAME 'olcSpReloadHint' "
2100                         "DESC 'Observe Reload Hint in Request control' "
2101                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2102         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2103 };
2104
2105 static ConfigOCs spocs[] = {
2106         { "( OLcfgOvOc:1.1 "
2107                 "NAME 'olcSyncProvConfig' "
2108                 "DESC 'SyncRepl Provider configuration' "
2109                 "SUP olcOverlayConfig "
2110                 "MAY ( olcSpCheckpoint $ olcSpSessionlog $ olcSpNoPresent ) )",
2111                         Cft_Overlay, spcfg },
2112         { NULL, 0, NULL }
2113 };
2114
2115 static int
2116 sp_cf_gen(ConfigArgs *c)
2117 {
2118         slap_overinst           *on = (slap_overinst *)c->bi;
2119         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2120         int rc = 0;
2121
2122         if ( c->op == SLAP_CONFIG_EMIT ) {
2123                 switch ( c->type ) {
2124                 case SP_CHKPT:
2125                         if ( si->si_chkops || si->si_chktime ) {
2126                                 struct berval bv;
2127                                 bv.bv_len = sprintf( c->msg, "%d %d",
2128                                         si->si_chkops, si->si_chktime );
2129                                 bv.bv_val = c->msg;
2130                                 value_add_one( &c->rvalue_vals, &bv );
2131                         } else {
2132                                 rc = 1;
2133                         }
2134                         break;
2135                 case SP_SESSL:
2136                         if ( si->si_logs ) {
2137                                 c->value_int = si->si_logs->sl_size;
2138                         } else {
2139                                 rc = 1;
2140                         }
2141                         break;
2142                 case SP_NOPRES:
2143                         if ( si->si_nopres ) {
2144                                 c->value_int = 1;
2145                         } else {
2146                                 rc = 1;
2147                         }
2148                         break;
2149                 case SP_USEHINT:
2150                         if ( si->si_usehint ) {
2151                                 c->value_int = 1;
2152                         } else {
2153                                 rc = 1;
2154                         }
2155                         break;
2156                 }
2157                 return rc;
2158         } else if ( c->op == LDAP_MOD_DELETE ) {
2159                 switch ( c->type ) {
2160                 case SP_CHKPT:
2161                         si->si_chkops = 0;
2162                         si->si_chktime = 0;
2163                         break;
2164                 case SP_SESSL:
2165                         if ( si->si_logs )
2166                                 si->si_logs->sl_size = 0;
2167                         else
2168                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2169                         break;
2170                 case SP_NOPRES:
2171                         if ( si->si_nopres )
2172                                 si->si_nopres = 0;
2173                         else
2174                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2175                         break;
2176                 case SP_USEHINT:
2177                         if ( si->si_usehint )
2178                                 si->si_usehint = 0;
2179                         else
2180                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2181                         break;
2182                 }
2183                 return rc;
2184         }
2185         switch ( c->type ) {
2186         case SP_CHKPT:
2187                 si->si_chkops = atoi( c->argv[1] );
2188                 si->si_chktime = atoi( c->argv[2] ) * 60;
2189                 break;
2190         case SP_SESSL: {
2191                 sessionlog *sl;
2192                 int size = c->value_int;
2193
2194                 if ( size < 0 ) {
2195                         sprintf( c->msg, "%s size %d is negative",
2196                                 c->argv[0], size );
2197                         Debug( LDAP_DEBUG_CONFIG, "%s: %s\n", c->log, c->msg, 0 );
2198                         return ARG_BAD_CONF;
2199                 }
2200                 sl = si->si_logs;
2201                 if ( !sl ) {
2202                         sl = ch_malloc( sizeof( sessionlog ) + LDAP_LUTIL_CSNSTR_BUFSIZE );
2203                         sl->sl_mincsn.bv_val = (char *)(sl+1);
2204                         sl->sl_mincsn.bv_len = 0;
2205                         sl->sl_num = 0;
2206                         sl->sl_head = sl->sl_tail = NULL;
2207                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
2208                         si->si_logs = sl;
2209                 }
2210                 sl->sl_size = size;
2211                 }
2212                 break;
2213         case SP_NOPRES:
2214                 si->si_nopres = c->value_int;
2215                 break;
2216         case SP_USEHINT:
2217                 si->si_usehint = c->value_int;
2218                 break;
2219         }
2220         return rc;
2221 }
2222
2223 /* ITS#3456 we cannot run this search on the main thread, must use a
2224  * child thread in order to insure we have a big enough stack.
2225  */
2226 static void *
2227 syncprov_db_otask(
2228         void *ptr
2229 )
2230 {
2231         syncprov_findcsn( ptr, FIND_MAXCSN );
2232         return NULL;
2233 }
2234
2235 /* Read any existing contextCSN from the underlying db.
2236  * Then search for any entries newer than that. If no value exists,
2237  * just generate it. Cache whatever result.
2238  */
2239 static int
2240 syncprov_db_open(
2241     BackendDB *be
2242 )
2243 {
2244         slap_overinst   *on = (slap_overinst *) be->bd_info;
2245         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2246
2247         Connection conn;
2248         OperationBuffer opbuf;
2249         char ctxcsnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
2250         Operation *op = (Operation *) &opbuf;
2251         Entry *e;
2252         Attribute *a;
2253         int rc;
2254         void *thrctx = NULL;
2255
2256         if ( slapMode & SLAP_TOOL_MODE ) {
2257                 return 0;
2258         }
2259
2260         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
2261         if ( rc ) {
2262                 return rc;
2263         }
2264
2265         thrctx = ldap_pvt_thread_pool_context();
2266         connection_fake_init( &conn, op, thrctx );
2267         op->o_bd = be;
2268         op->o_dn = be->be_rootdn;
2269         op->o_ndn = be->be_rootndn;
2270
2271         ctxcsnbuf[0] = '\0';
2272
2273         op->o_bd->bd_info = on->on_info->oi_orig;
2274         rc = be_entry_get_rw( op, be->be_nsuffix, NULL,
2275                 slap_schema.si_ad_contextCSN, 0, &e );
2276
2277         if ( e ) {
2278                 ldap_pvt_thread_t tid;
2279
2280                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
2281                 if ( a ) {
2282                         si->si_ctxcsn.bv_len = a->a_nvals[0].bv_len;
2283                         if ( si->si_ctxcsn.bv_len >= sizeof(si->si_ctxcsnbuf ))
2284                                 si->si_ctxcsn.bv_len = sizeof(si->si_ctxcsnbuf)-1;
2285                         strncpy( si->si_ctxcsnbuf, a->a_nvals[0].bv_val,
2286                                 si->si_ctxcsn.bv_len );
2287                         si->si_ctxcsnbuf[si->si_ctxcsn.bv_len] = '\0';
2288                         strcpy( ctxcsnbuf, si->si_ctxcsnbuf );
2289                 }
2290                 be_entry_release_rw( op, e, 0 );
2291                 op->o_bd->bd_info = (BackendInfo *)on;
2292                 op->o_req_dn = be->be_suffix[0];
2293                 op->o_req_ndn = be->be_nsuffix[0];
2294                 op->ors_scope = LDAP_SCOPE_SUBTREE;
2295                 ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
2296                 ldap_pvt_thread_join( tid, NULL );
2297         } else if ( SLAP_SYNC_SHADOW( op->o_bd )) {
2298                 /* If we're also a consumer, and we didn't find the context entry,
2299                  * then don't generate anything, wait for our provider to send it
2300                  * to us.
2301                  */
2302                 goto out;
2303         }
2304
2305         if ( BER_BVISEMPTY( &si->si_ctxcsn ) ) {
2306                 si->si_ctxcsn.bv_len = sizeof( si->si_ctxcsnbuf );
2307                 slap_get_csn( op, &si->si_ctxcsn, 0 );
2308         }
2309
2310         /* If our ctxcsn is different from what was read from the root
2311          * entry, make sure we do a checkpoint on close
2312          */
2313         if ( strcmp( si->si_ctxcsnbuf, ctxcsnbuf )) {
2314                 si->si_numops++;
2315         }
2316
2317 out:
2318         op->o_bd->bd_info = (BackendInfo *)on;
2319         ldap_pvt_thread_pool_context_reset( thrctx );
2320         return 0;
2321 }
2322
2323 /* Write the current contextCSN into the underlying db.
2324  */
2325 static int
2326 syncprov_db_close(
2327     BackendDB *be
2328 )
2329 {
2330     slap_overinst   *on = (slap_overinst *) be->bd_info;
2331     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2332
2333         if ( slapMode & SLAP_TOOL_MODE ) {
2334                 return 0;
2335         }
2336         if ( si->si_numops ) {
2337                 Connection conn;
2338                 OperationBuffer opbuf;
2339                 Operation *op = (Operation *) &opbuf;
2340                 SlapReply rs = {REP_RESULT};
2341                 void *thrctx;
2342
2343                 thrctx = ldap_pvt_thread_pool_context();
2344                 connection_fake_init( &conn, op, thrctx );
2345                 op->o_bd = be;
2346                 op->o_dn = be->be_rootdn;
2347                 op->o_ndn = be->be_rootndn;
2348                 syncprov_checkpoint( op, &rs, on );
2349                 ldap_pvt_thread_pool_context_reset( thrctx );
2350         }
2351
2352     return 0;
2353 }
2354
2355 static int
2356 syncprov_db_init(
2357         BackendDB *be
2358 )
2359 {
2360         slap_overinst   *on = (slap_overinst *)be->bd_info;
2361         syncprov_info_t *si;
2362
2363         si = ch_calloc(1, sizeof(syncprov_info_t));
2364         on->on_bi.bi_private = si;
2365         ldap_pvt_thread_mutex_init( &si->si_csn_mutex );
2366         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
2367         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
2368         si->si_ctxcsn.bv_val = si->si_ctxcsnbuf;
2369
2370         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
2371         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
2372         csn_anlist[1].an_desc = slap_schema.si_ad_entryUUID;
2373         csn_anlist[1].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2374
2375         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
2376         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2377
2378         return 0;
2379 }
2380
2381 static int
2382 syncprov_db_destroy(
2383         BackendDB *be
2384 )
2385 {
2386         slap_overinst   *on = (slap_overinst *)be->bd_info;
2387         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2388
2389         if ( si ) {
2390                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
2391                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
2392                 ldap_pvt_thread_mutex_destroy( &si->si_csn_mutex );
2393                 ch_free( si );
2394         }
2395
2396         return 0;
2397 }
2398
2399 static int syncprov_parseCtrl (
2400         Operation *op,
2401         SlapReply *rs,
2402         LDAPControl *ctrl )
2403 {
2404         ber_tag_t tag;
2405         BerElementBuffer berbuf;
2406         BerElement *ber = (BerElement *)&berbuf;
2407         ber_int_t mode;
2408         ber_len_t len;
2409         struct berval cookie = BER_BVNULL;
2410         sync_control *sr;
2411         int rhint = 0;
2412
2413         if ( op->o_sync != SLAP_CONTROL_NONE ) {
2414                 rs->sr_text = "Sync control specified multiple times";
2415                 return LDAP_PROTOCOL_ERROR;
2416         }
2417
2418         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
2419                 rs->sr_text = "Sync control specified with pagedResults control";
2420                 return LDAP_PROTOCOL_ERROR;
2421         }
2422
2423         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
2424                 rs->sr_text = "Sync control value is empty (or absent)";
2425                 return LDAP_PROTOCOL_ERROR;
2426         }
2427
2428         /* Parse the control value
2429          *      syncRequestValue ::= SEQUENCE {
2430          *              mode   ENUMERATED {
2431          *                      -- 0 unused
2432          *                      refreshOnly             (1),
2433          *                      -- 2 reserved
2434          *                      refreshAndPersist       (3)
2435          *              },
2436          *              cookie  syncCookie OPTIONAL
2437          *      }
2438          */
2439
2440         ber_init2( ber, &ctrl->ldctl_value, 0 );
2441
2442         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
2443                 rs->sr_text = "Sync control : mode decoding error";
2444                 return LDAP_PROTOCOL_ERROR;
2445         }
2446
2447         switch( mode ) {
2448         case LDAP_SYNC_REFRESH_ONLY:
2449                 mode = SLAP_SYNC_REFRESH;
2450                 break;
2451         case LDAP_SYNC_REFRESH_AND_PERSIST:
2452                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
2453                 break;
2454         default:
2455                 rs->sr_text = "Sync control : unknown update mode";
2456                 return LDAP_PROTOCOL_ERROR;
2457         }
2458
2459         tag = ber_peek_tag( ber, &len );
2460
2461         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
2462                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
2463                         rs->sr_text = "Sync control : cookie decoding error";
2464                         return LDAP_PROTOCOL_ERROR;
2465                 }
2466                 tag = ber_peek_tag( ber, &len );
2467         }
2468         if ( tag == LDAP_TAG_RELOAD_HINT ) {
2469                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
2470                         rs->sr_text = "Sync control : rhint decoding error";
2471                         return LDAP_PROTOCOL_ERROR;
2472                 }
2473         }
2474         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
2475                         rs->sr_text = "Sync control : decoding error";
2476                         return LDAP_PROTOCOL_ERROR;
2477         }
2478         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
2479         sr->sr_rhint = rhint;
2480         if (!BER_BVISNULL(&cookie)) {
2481                 ber_dupbv_x( &sr->sr_state.octet_str, &cookie, op->o_tmpmemctx );
2482                 slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx );
2483                 if ( sr->sr_state.rid == -1 ) {
2484                         rs->sr_text = "Sync control : cookie parsing error";
2485                         return LDAP_PROTOCOL_ERROR;
2486                 }
2487         }
2488
2489         op->o_controls[slap_cids.sc_LDAPsync] = sr;
2490
2491         op->o_sync = ctrl->ldctl_iscritical
2492                 ? SLAP_CONTROL_CRITICAL
2493                 : SLAP_CONTROL_NONCRITICAL;
2494
2495         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
2496
2497         return LDAP_SUCCESS;
2498 }
2499
2500 /* This overlay is set up for dynamic loading via moduleload. For static
2501  * configuration, you'll need to arrange for the slap_overinst to be
2502  * initialized and registered by some other function inside slapd.
2503  */
2504
2505 static slap_overinst            syncprov;
2506
2507 int
2508 syncprov_init()
2509 {
2510         int rc;
2511
2512         rc = register_supported_control( LDAP_CONTROL_SYNC,
2513                 SLAP_CTRL_HIDE|SLAP_CTRL_SEARCH, NULL,
2514                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
2515         if ( rc != LDAP_SUCCESS ) {
2516                 Debug( LDAP_DEBUG_ANY,
2517                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
2518                 return rc;
2519         }
2520
2521         syncprov.on_bi.bi_type = "syncprov";
2522         syncprov.on_bi.bi_db_init = syncprov_db_init;
2523         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
2524         syncprov.on_bi.bi_db_open = syncprov_db_open;
2525         syncprov.on_bi.bi_db_close = syncprov_db_close;
2526
2527         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
2528         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
2529
2530         syncprov.on_bi.bi_op_add = syncprov_op_mod;
2531         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
2532         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
2533         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
2534         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
2535         syncprov.on_bi.bi_op_search = syncprov_op_search;
2536         syncprov.on_bi.bi_extended = syncprov_op_extended;
2537         syncprov.on_bi.bi_operational = syncprov_operational;
2538
2539         syncprov.on_bi.bi_cf_ocs = spocs;
2540
2541         generic_filter.f_desc = slap_schema.si_ad_objectClass;
2542
2543         rc = config_register_schema( spcfg, spocs );
2544         if ( rc ) return rc;
2545
2546         return overlay_register( &syncprov );
2547 }
2548
2549 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
2550 int
2551 init_module( int argc, char *argv[] )
2552 {
2553         return syncprov_init();
2554 }
2555 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
2556
2557 #endif /* defined(SLAPD_OVER_SYNCPROV) */