git.sur5r.net Git - openldap/blob - servers/slapd/overlays/syncprov.c

   1 /* $OpenLDAP$ */
   2 /* syncprov.c - syncrepl provider */
   3 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   4  *
   5  * Copyright 2004-2005 The OpenLDAP Foundation.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted only as authorized by the OpenLDAP
  10  * Public License.
  11  *
  12  * A copy of this license is available in the file LICENSE in the
  13  * top-level directory of the distribution or, alternatively, at
  14  * <http://www.OpenLDAP.org/license.html>.
  15  */
  16 /* ACKNOWLEDGEMENTS:
  17  * This work was initially developed by Howard Chu for inclusion in
  18  * OpenLDAP Software.
  19  */
  20
  21 #include "portable.h"
  22
  23 #ifdef SLAPD_OVER_SYNCPROV
  24
  25 #include <ac/string.h>
  26 #include "lutil.h"
  27 #include "slap.h"
  28 #include "config.h"
  29 #include "ldap_rq.h"
  30
  31 /* A modify request on a particular entry */
  32 typedef struct modinst {
  33         struct modinst *mi_next;
  34         Operation *mi_op;
  35 } modinst;
  36
  37 typedef struct modtarget {
  38         struct modinst *mt_mods;
  39         struct modinst *mt_tail;
  40         Operation *mt_op;
  41         ldap_pvt_thread_mutex_t mt_mutex;
  42 } modtarget;
  43
  44 /* A queued result of a persistent search */
  45 typedef struct syncres {
  46         struct syncres *s_next;
  47         struct berval s_dn;
  48         struct berval s_ndn;
  49         struct berval s_uuid;
  50         struct berval s_csn;
  51         char s_mode;
  52         char s_isreference;
  53 } syncres;
  54
  55 /* Record of a persistent search */
  56 typedef struct syncops {
  57         struct syncops *s_next;
  58         struct berval   s_base;         /* ndn of search base */
  59         ID              s_eid;          /* entryID of search base */
  60         Operation       *s_op;          /* search op */
  61         int             s_rid;
  62         struct berval s_filterstr;
  63         int             s_flags;        /* search status */
  64 #define PS_IS_REFRESHING        0x01
  65 #define PS_IS_DETACHED          0x02
  66 #define PS_WROTE_BASE           0x04
  67 #define PS_FIND_BASE            0x08
  68
  69         int             s_inuse;        /* reference count */
  70         struct syncres *s_res;
  71         struct syncres *s_restail;
  72         struct re_s     *s_qtask;       /* task for playing psearch responses */
  73 #define RUNQ_INTERVAL   36000   /* a long time */
  74         ldap_pvt_thread_mutex_t s_mutex;
  75 } syncops;
  76
  77 /* A received sync control */
  78 typedef struct sync_control {
  79         struct sync_cookie sr_state;
  80         int sr_rhint;
  81 } sync_control;
  82
  83 #if 0 /* moved back to slap.h */
  84 #define o_sync  o_ctrlflag[slap_cids.sc_LDAPsync]
  85 #endif
  86 /* o_sync_mode uses data bits of o_sync */
  87 #define o_sync_mode     o_ctrlflag[slap_cids.sc_LDAPsync]
  88
  89 #define SLAP_SYNC_NONE                                  (LDAP_SYNC_NONE<<SLAP_CONTROL_SHIFT)
  90 #define SLAP_SYNC_REFRESH                               (LDAP_SYNC_REFRESH_ONLY<<SLAP_CONTROL_SHIFT)
  91 #define SLAP_SYNC_PERSIST                               (LDAP_SYNC_RESERVED<<SLAP_CONTROL_SHIFT)
  92 #define SLAP_SYNC_REFRESH_AND_PERSIST   (LDAP_SYNC_REFRESH_AND_PERSIST<<SLAP_CONTROL_SHIFT)
  93
  94 /* Record of which searches matched at premodify step */
  95 typedef struct syncmatches {
  96         struct syncmatches *sm_next;
  97         syncops *sm_op;
  98 } syncmatches;
  99
 100 /* Session log data */
 101 typedef struct slog_entry {
 102         struct slog_entry *se_next;
 103         struct berval se_uuid;
 104         struct berval se_csn;
 105         ber_tag_t       se_tag;
 106 } slog_entry;
 107
 108 typedef struct sessionlog {
 109         struct berval   sl_mincsn;
 110         int             sl_num;
 111         int             sl_size;
 112         slog_entry *sl_head;
 113         slog_entry *sl_tail;
 114         ldap_pvt_thread_mutex_t sl_mutex;
 115 } sessionlog;
 116
 117 /* The main state for this overlay */
 118 typedef struct syncprov_info_t {
 119         syncops         *si_ops;
 120         struct berval   si_ctxcsn;      /* ldapsync context */
 121         int             si_chkops;      /* checkpointing info */
 122         int             si_chktime;
 123         int             si_numops;      /* number of ops since last checkpoint */
 124         int             si_nopres;      /* Skip present phase */
 125         int             si_usehint;     /* use reload hint */
 126         time_t  si_chklast;     /* time of last checkpoint */
 127         Avlnode *si_mods;       /* entries being modified */
 128         sessionlog      *si_logs;
 129         ldap_pvt_thread_mutex_t si_csn_mutex;
 130         ldap_pvt_thread_mutex_t si_ops_mutex;
 131         ldap_pvt_thread_mutex_t si_mods_mutex;
 132         char            si_ctxcsnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 133 } syncprov_info_t;
 134
 135 typedef struct opcookie {
 136         slap_overinst *son;
 137         syncmatches *smatches;
 138         struct berval sdn;      /* DN of entry, for deletes */
 139         struct berval sndn;
 140         struct berval suuid;    /* UUID of entry */
 141         struct berval sctxcsn;
 142         int sreference; /* Is the entry a reference? */
 143 } opcookie;
 144
 145 typedef struct fbase_cookie {
 146         struct berval *fdn;     /* DN of a modified entry, for scope testing */
 147         syncops *fss;   /* persistent search we're testing against */
 148         int fbase;      /* if TRUE we found the search base and it's still valid */
 149         int fscope;     /* if TRUE then fdn is within the psearch scope */
 150 } fbase_cookie;
 151
 152 static AttributeName csn_anlist[3];
 153 static AttributeName uuid_anlist[2];
 154
 155 /* Build a LDAPsync intermediate state control */
 156 static int
 157 syncprov_state_ctrl(
 158         Operation       *op,
 159         SlapReply       *rs,
 160         Entry           *e,
 161         int             entry_sync_state,
 162         LDAPControl     **ctrls,
 163         int             num_ctrls,
 164         int             send_cookie,
 165         struct berval   *cookie )
 166 {
 167         Attribute* a;
 168         int ret;
 169
 170         BerElementBuffer berbuf;
 171         BerElement *ber = (BerElement *)&berbuf;
 172
 173         struct berval   entryuuid_bv = BER_BVNULL;
 174
 175         ber_init2( ber, 0, LBER_USE_DER );
 176         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 177
 178         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 179
 180         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 181                 AttributeDescription *desc = a->a_desc;
 182                 if ( desc == slap_schema.si_ad_entryUUID ) {
 183                         entryuuid_bv = a->a_nvals[0];
 184                         break;
 185                 }
 186         }
 187
 188         /* FIXME: what if entryuuid is NULL or empty ? */
 189
 190         if ( send_cookie && cookie ) {
 191                 ber_printf( ber, "{eOON}",
 192                         entry_sync_state, &entryuuid_bv, cookie );
 193         } else {
 194                 ber_printf( ber, "{eON}",
 195                         entry_sync_state, &entryuuid_bv );
 196         }
 197
 198         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 199         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 200         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 201
 202         ber_free_buf( ber );
 203
 204         if ( ret < 0 ) {
 205                 Debug( LDAP_DEBUG_TRACE,
 206                         "slap_build_sync_ctrl: ber_flatten2 failed\n",
 207                         0, 0, 0 );
 208                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 209                 return ret;
 210         }
 211
 212         return LDAP_SUCCESS;
 213 }
 214
 215 /* Build a LDAPsync final state control */
 216 static int
 217 syncprov_done_ctrl(
 218         Operation       *op,
 219         SlapReply       *rs,
 220         LDAPControl     **ctrls,
 221         int                     num_ctrls,
 222         int                     send_cookie,
 223         struct berval *cookie,
 224         int                     refreshDeletes )
 225 {
 226         int ret;
 227         BerElementBuffer berbuf;
 228         BerElement *ber = (BerElement *)&berbuf;
 229
 230         ber_init2( ber, NULL, LBER_USE_DER );
 231         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 232
 233         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 234
 235         ber_printf( ber, "{" );
 236         if ( send_cookie && cookie ) {
 237                 ber_printf( ber, "O", cookie );
 238         }
 239         if ( refreshDeletes == LDAP_SYNC_REFRESH_DELETES ) {
 240                 ber_printf( ber, "b", refreshDeletes );
 241         }
 242         ber_printf( ber, "N}" );
 243
 244         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_DONE;
 245         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 246         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 247
 248         ber_free_buf( ber );
 249
 250         if ( ret < 0 ) {
 251                 Debug( LDAP_DEBUG_TRACE,
 252                         "syncprov_done_ctrl: ber_flatten2 failed\n",
 253                         0, 0, 0 );
 254                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 255                 return ret;
 256         }
 257
 258         return LDAP_SUCCESS;
 259 }
 260
 261 static int
 262 syncprov_sendinfo(
 263         Operation       *op,
 264         SlapReply       *rs,
 265         int                     type,
 266         struct berval *cookie,
 267         int                     refreshDone,
 268         BerVarray       syncUUIDs,
 269         int                     refreshDeletes )
 270 {
 271         BerElementBuffer berbuf;
 272         BerElement *ber = (BerElement *)&berbuf;
 273         struct berval rspdata;
 274
 275         int ret;
 276
 277         ber_init2( ber, NULL, LBER_USE_DER );
 278         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 279
 280         if ( type ) {
 281                 switch ( type ) {
 282                 case LDAP_TAG_SYNC_NEW_COOKIE:
 283                         ber_printf( ber, "tO", type, cookie );
 284                         break;
 285                 case LDAP_TAG_SYNC_REFRESH_DELETE:
 286                 case LDAP_TAG_SYNC_REFRESH_PRESENT:
 287                         ber_printf( ber, "t{", type );
 288                         if ( cookie ) {
 289                                 ber_printf( ber, "O", cookie );
 290                         }
 291                         if ( refreshDone == 0 ) {
 292                                 ber_printf( ber, "b", refreshDone );
 293                         }
 294                         ber_printf( ber, "N}" );
 295                         break;
 296                 case LDAP_TAG_SYNC_ID_SET:
 297                         ber_printf( ber, "t{", type );
 298                         if ( cookie ) {
 299                                 ber_printf( ber, "O", cookie );
 300                         }
 301                         if ( refreshDeletes == 1 ) {
 302                                 ber_printf( ber, "b", refreshDeletes );
 303                         }
 304                         ber_printf( ber, "[W]", syncUUIDs );
 305                         ber_printf( ber, "N}" );
 306                         break;
 307                 default:
 308                         Debug( LDAP_DEBUG_TRACE,
 309                                 "syncprov_sendinfo: invalid syncinfo type (%d)\n",
 310                                 type, 0, 0 );
 311                         return LDAP_OTHER;
 312                 }
 313         }
 314
 315         ret = ber_flatten2( ber, &rspdata, 0 );
 316
 317         if ( ret < 0 ) {
 318                 Debug( LDAP_DEBUG_TRACE,
 319                         "syncprov_sendinfo: ber_flatten2 failed\n",
 320                         0, 0, 0 );
 321                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 322                 return ret;
 323         }
 324
 325         rs->sr_rspoid = LDAP_SYNC_INFO;
 326         rs->sr_rspdata = &rspdata;
 327         send_ldap_intermediate( op, rs );
 328         rs->sr_rspdata = NULL;
 329         ber_free_buf( ber );
 330
 331         return LDAP_SUCCESS;
 332 }
 333
 334 /* Find a modtarget in an AVL tree */
 335 static int
 336 sp_avl_cmp( const void *c1, const void *c2 )
 337 {
 338         const modtarget *m1, *m2;
 339         int rc;
 340
 341         m1 = c1; m2 = c2;
 342         rc = m1->mt_op->o_req_ndn.bv_len - m2->mt_op->o_req_ndn.bv_len;
 343
 344         if ( rc ) return rc;
 345         return ber_bvcmp( &m1->mt_op->o_req_ndn, &m2->mt_op->o_req_ndn );
 346 }
 347
 348 /* syncprov_findbase:
 349  *   finds the true DN of the base of a search (with alias dereferencing) and
 350  * checks to make sure the base entry doesn't get replaced with a different
 351  * entry (e.g., swapping trees via ModDN, or retargeting an alias). If a
 352  * change is detected, any persistent search on this base must be terminated /
 353  * reloaded.
 354  *   On the first call, we just save the DN and entryID. On subsequent calls
 355  * we compare the DN and entryID with the saved values.
 356  */
 357 static int
 358 findbase_cb( Operation *op, SlapReply *rs )
 359 {
 360         slap_callback *sc = op->o_callback;
 361
 362         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 363                 fbase_cookie *fc = sc->sc_private;
 364
 365                 /* If no entryID, we're looking for the first time.
 366                  * Just store whatever we got.
 367                  */
 368                 if ( fc->fss->s_eid == NOID ) {
 369                         fc->fbase = 2;
 370                         fc->fss->s_eid = rs->sr_entry->e_id;
 371                         ber_dupbv( &fc->fss->s_base, &rs->sr_entry->e_nname );
 372
 373                 } else if ( rs->sr_entry->e_id == fc->fss->s_eid &&
 374                         dn_match( &rs->sr_entry->e_nname, &fc->fss->s_base )) {
 375
 376                 /* OK, the DN is the same and the entryID is the same. */
 377                         fc->fbase = 1;
 378                 }
 379         }
 380         if ( rs->sr_err != LDAP_SUCCESS ) {
 381                 Debug( LDAP_DEBUG_ANY, "findbase failed! %d\n", rs->sr_err,0,0 );
 382         }
 383         return LDAP_SUCCESS;
 384 }
 385
 386 static Filter generic_filter = { LDAP_FILTER_PRESENT, { 0 }, NULL };
 387 static struct berval generic_filterstr = BER_BVC("(objectclass=*)");
 388
 389 static int
 390 syncprov_findbase( Operation *op, fbase_cookie *fc )
 391 {
 392         opcookie *opc = op->o_callback->sc_private;
 393         slap_overinst *on = opc->son;
 394
 395         /* Use basic parameters from syncrepl search, but use
 396          * current op's threadctx / tmpmemctx
 397          */
 398         ldap_pvt_thread_mutex_lock( &fc->fss->s_mutex );
 399         if ( fc->fss->s_flags & PS_FIND_BASE ) {
 400                 slap_callback cb = {0};
 401                 Operation fop;
 402                 SlapReply frs = { REP_RESULT };
 403                 int rc;
 404
 405                 fc->fss->s_flags ^= PS_FIND_BASE;
 406                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 407
 408                 fop = *fc->fss->s_op;
 409
 410                 fop.o_hdr = op->o_hdr;
 411                 fop.o_bd = op->o_bd;
 412                 fop.o_time = op->o_time;
 413                 fop.o_tincr = op->o_tincr;
 414
 415                 cb.sc_response = findbase_cb;
 416                 cb.sc_private = fc;
 417
 418                 fop.o_sync_mode = 0;    /* turn off sync mode */
 419                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 420                 fop.o_callback = &cb;
 421                 fop.o_tag = LDAP_REQ_SEARCH;
 422                 fop.ors_scope = LDAP_SCOPE_BASE;
 423                 fop.ors_limit = NULL;
 424                 fop.ors_slimit = 1;
 425                 fop.ors_tlimit = SLAP_NO_LIMIT;
 426                 fop.ors_attrs = slap_anlist_no_attrs;
 427                 fop.ors_attrsonly = 1;
 428                 fop.ors_filter = &generic_filter;
 429                 fop.ors_filterstr = generic_filterstr;
 430
 431                 fop.o_bd->bd_info = on->on_info->oi_orig;
 432                 rc = fop.o_bd->be_search( &fop, &frs );
 433                 fop.o_bd->bd_info = (BackendInfo *)on;
 434         } else {
 435                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 436                 fc->fbase = 1;
 437         }
 438
 439         /* After the first call, see if the fdn resides in the scope */
 440         if ( fc->fbase == 1 ) {
 441                 switch ( fc->fss->s_op->ors_scope ) {
 442                 case LDAP_SCOPE_BASE:
 443                         fc->fscope = dn_match( fc->fdn, &fc->fss->s_base );
 444                         break;
 445                 case LDAP_SCOPE_ONELEVEL: {
 446                         struct berval pdn;
 447                         dnParent( fc->fdn, &pdn );
 448                         fc->fscope = dn_match( &pdn, &fc->fss->s_base );
 449                         break; }
 450                 case LDAP_SCOPE_SUBTREE:
 451                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base );
 452                         break;
 453 #ifdef LDAP_SCOPE_SUBORDINATE
 454                 case LDAP_SCOPE_SUBORDINATE:
 455                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base ) &&
 456                                 !dn_match( fc->fdn, &fc->fss->s_base );
 457                         break;
 458 #endif
 459                 }
 460         }
 461
 462         if ( fc->fbase )
 463                 return LDAP_SUCCESS;
 464
 465         /* If entryID has changed, then the base of this search has
 466          * changed. Invalidate the psearch.
 467          */
 468         return LDAP_NO_SUCH_OBJECT;
 469 }
 470
 471 /* syncprov_findcsn:
 472  *   This function has three different purposes, but they all use a search
 473  * that filters on entryCSN so they're combined here.
 474  * 1: at startup time, after a contextCSN has been read from the database,
 475  * we search for all entries with CSN >= contextCSN in case the contextCSN
 476  * was not checkpointed at the previous shutdown.
 477  *
 478  * 2: when the current contextCSN is known and we have a sync cookie, we search
 479  * for one entry with CSN = the cookie CSN. If not found, try <= cookie CSN.
 480  * If an entry is found, the cookie CSN is valid, otherwise it is stale.
 481  *
 482  * 3: during a refresh phase, we search for all entries with CSN <= the cookie
 483  * CSN, and generate Present records for them. We always collect this result
 484  * in SyncID sets, even if there's only one match.
 485  */
 486 typedef enum find_csn_t {
 487         FIND_MAXCSN     = 1,
 488         FIND_CSN        = 2,
 489         FIND_PRESENT    = 3
 490 } find_csn_t;
 491
 492 static int
 493 findmax_cb( Operation *op, SlapReply *rs )
 494 {
 495         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 496                 struct berval *maxcsn = op->o_callback->sc_private;
 497                 Attribute *a = attr_find( rs->sr_entry->e_attrs,
 498                         slap_schema.si_ad_entryCSN );
 499
 500                 if ( a && ber_bvcmp( &a->a_vals[0], maxcsn ) > 0 ) {
 501                         maxcsn->bv_len = a->a_vals[0].bv_len;
 502                         strcpy( maxcsn->bv_val, a->a_vals[0].bv_val );
 503                 }
 504         }
 505         return LDAP_SUCCESS;
 506 }
 507
 508 static int
 509 findcsn_cb( Operation *op, SlapReply *rs )
 510 {
 511         slap_callback *sc = op->o_callback;
 512
 513         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 514                 sc->sc_private = (void *)1;
 515         }
 516         return LDAP_SUCCESS;
 517 }
 518
 519 /* Build a list of entryUUIDs for sending in a SyncID set */
 520
 521 #define UUID_LEN        16
 522
 523 typedef struct fpres_cookie {
 524         int num;
 525         BerVarray uuids;
 526         char *last;
 527 } fpres_cookie;
 528
 529 static int
 530 findpres_cb( Operation *op, SlapReply *rs )
 531 {
 532         slap_callback *sc = op->o_callback;
 533         fpres_cookie *pc = sc->sc_private;
 534         Attribute *a;
 535         int ret = SLAP_CB_CONTINUE;
 536
 537         switch ( rs->sr_type ) {
 538         case REP_SEARCH:
 539                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryUUID );
 540                 if ( a ) {
 541                         pc->uuids[pc->num].bv_val = pc->last;
 542                         AC_MEMCPY( pc->uuids[pc->num].bv_val, a->a_nvals[0].bv_val,
 543                                 pc->uuids[pc->num].bv_len );
 544                         pc->num++;
 545                         pc->last = pc->uuids[pc->num].bv_val;
 546                         pc->uuids[pc->num].bv_val = NULL;
 547                 }
 548                 ret = LDAP_SUCCESS;
 549                 if ( pc->num != SLAP_SYNCUUID_SET_SIZE )
 550                         break;
 551                 /* FALLTHRU */
 552         case REP_RESULT:
 553                 ret = rs->sr_err;
 554                 if ( pc->num ) {
 555                         ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 556                                 0, pc->uuids, 0 );
 557                         pc->uuids[pc->num].bv_val = pc->last;
 558                         pc->num = 0;
 559                         pc->last = pc->uuids[0].bv_val;
 560                 }
 561                 break;
 562         default:
 563                 break;
 564         }
 565         return ret;
 566 }
 567
 568 static int
 569 syncprov_findcsn( Operation *op, find_csn_t mode )
 570 {
 571         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 572         syncprov_info_t         *si = on->on_bi.bi_private;
 573
 574         slap_callback cb = {0};
 575         Operation fop;
 576         SlapReply frs = { REP_RESULT };
 577         char buf[LDAP_LUTIL_CSNSTR_BUFSIZE + STRLENOF("(entryCSN<=)")];
 578         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 579         struct berval maxcsn;
 580         Filter cf, af;
 581 #ifdef LDAP_COMP_MATCH
 582         AttributeAssertion eq = { NULL, BER_BVNULL, NULL };
 583 #else
 584         AttributeAssertion eq = { NULL, BER_BVNULL };
 585 #endif
 586         fpres_cookie pcookie;
 587         sync_control *srs = NULL;
 588         struct slap_limits_set fc_limits;
 589         int i, rc = LDAP_SUCCESS, findcsn_retry = 1;
 590
 591         if ( mode != FIND_MAXCSN ) {
 592                 srs = op->o_controls[slap_cids.sc_LDAPsync];
 593
 594                 if ( srs->sr_state.ctxcsn.bv_len >= LDAP_LUTIL_CSNSTR_BUFSIZE ) {
 595                         return LDAP_OTHER;
 596                 }
 597         }
 598
 599         fop = *op;
 600         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync_mode */
 601         /* We want pure entries, not referrals */
 602         fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 603
 604         cf.f_ava = &eq;
 605         cf.f_av_desc = slap_schema.si_ad_entryCSN;
 606         cf.f_next = NULL;
 607
 608         fop.o_callback = &cb;
 609         fop.ors_limit = NULL;
 610         fop.ors_tlimit = SLAP_NO_LIMIT;
 611         fop.ors_filter = &cf;
 612         fop.ors_filterstr.bv_val = buf;
 613
 614 again:
 615         switch( mode ) {
 616         case FIND_MAXCSN:
 617                 cf.f_choice = LDAP_FILTER_GE;
 618                 cf.f_av_value = si->si_ctxcsn;
 619                 fop.ors_filterstr.bv_len = sprintf( buf, "(entryCSN>=%s)",
 620                         cf.f_av_value.bv_val );
 621                 fop.ors_attrsonly = 0;
 622                 fop.ors_attrs = csn_anlist;
 623                 fop.ors_slimit = SLAP_NO_LIMIT;
 624                 cb.sc_private = &maxcsn;
 625                 cb.sc_response = findmax_cb;
 626                 strcpy( cbuf, si->si_ctxcsn.bv_val );
 627                 maxcsn.bv_val = cbuf;
 628                 maxcsn.bv_len = si->si_ctxcsn.bv_len;
 629                 break;
 630         case FIND_CSN:
 631                 cf.f_av_value = srs->sr_state.ctxcsn;
 632                 /* Look for exact match the first time */
 633                 if ( findcsn_retry ) {
 634                         cf.f_choice = LDAP_FILTER_EQUALITY;
 635                         fop.ors_filterstr.bv_len = sprintf( buf, "(entryCSN=%s)",
 636                                 cf.f_av_value.bv_val );
 637                 /* On retry, look for <= */
 638                 } else {
 639                         cf.f_choice = LDAP_FILTER_LE;
 640                         fop.ors_limit = &fc_limits;
 641                         fc_limits.lms_s_unchecked = 1;
 642                         fop.ors_filterstr.bv_len = sprintf( buf, "(entryCSN<=%s)",
 643                                 cf.f_av_value.bv_val );
 644                 }
 645                 fop.ors_attrsonly = 1;
 646                 fop.ors_attrs = slap_anlist_no_attrs;
 647                 fop.ors_slimit = 1;
 648                 cb.sc_private = NULL;
 649                 cb.sc_response = findcsn_cb;
 650                 break;
 651         case FIND_PRESENT:
 652                 af.f_choice = LDAP_FILTER_AND;
 653                 af.f_next = NULL;
 654                 af.f_and = &cf;
 655                 cf.f_choice = LDAP_FILTER_LE;
 656                 cf.f_av_value = srs->sr_state.ctxcsn;
 657                 cf.f_next = op->ors_filter;
 658                 fop.ors_filter = &af;
 659                 filter2bv_x( &fop, fop.ors_filter, &fop.ors_filterstr );
 660                 fop.ors_attrsonly = 0;
 661                 fop.ors_attrs = uuid_anlist;
 662                 fop.ors_slimit = SLAP_NO_LIMIT;
 663                 cb.sc_private = &pcookie;
 664                 cb.sc_response = findpres_cb;
 665                 pcookie.num = 0;
 666
 667                 /* preallocate storage for a full set */
 668                 pcookie.uuids = op->o_tmpalloc( (SLAP_SYNCUUID_SET_SIZE+1) *
 669                         sizeof(struct berval) + SLAP_SYNCUUID_SET_SIZE * UUID_LEN,
 670                         op->o_tmpmemctx );
 671                 pcookie.last = (char *)(pcookie.uuids + SLAP_SYNCUUID_SET_SIZE+1);
 672                 pcookie.uuids[0].bv_val = pcookie.last;
 673                 pcookie.uuids[0].bv_len = UUID_LEN;
 674                 for (i=1; i<SLAP_SYNCUUID_SET_SIZE; i++) {
 675                         pcookie.uuids[i].bv_val = pcookie.uuids[i-1].bv_val + UUID_LEN;
 676                         pcookie.uuids[i].bv_len = UUID_LEN;
 677                 }
 678                 break;
 679         }
 680
 681         fop.o_bd->bd_info = on->on_info->oi_orig;
 682         fop.o_bd->be_search( &fop, &frs );
 683         fop.o_bd->bd_info = (BackendInfo *)on;
 684
 685         switch( mode ) {
 686         case FIND_MAXCSN:
 687                 strcpy( si->si_ctxcsnbuf, maxcsn.bv_val );
 688                 si->si_ctxcsn.bv_len = maxcsn.bv_len;
 689                 break;
 690         case FIND_CSN:
 691                 /* If matching CSN was not found, invalidate the context. */
 692                 if ( !cb.sc_private ) {
 693                         /* If we didn't find an exact match, then try for <= */
 694                         if ( findcsn_retry ) {
 695                                 findcsn_retry = 0;
 696                                 goto again;
 697                         }
 698                         rc = LDAP_NO_SUCH_OBJECT;
 699                 }
 700                 break;
 701         case FIND_PRESENT:
 702                 op->o_tmpfree( pcookie.uuids, op->o_tmpmemctx );
 703                 op->o_tmpfree( fop.ors_filterstr.bv_val, op->o_tmpmemctx );
 704                 break;
 705         }
 706
 707         return rc;
 708 }
 709
 710 static void
 711 syncprov_free_syncop( syncops *so )
 712 {
 713         syncres *sr, *srnext;
 714         GroupAssertion *ga, *gnext;
 715
 716         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 717         if ( --so->s_inuse > 0 ) {
 718                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 719                 return;
 720         }
 721         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 722         if ( so->s_flags & PS_IS_DETACHED ) {
 723                 filter_free( so->s_op->ors_filter );
 724                 for ( ga = so->s_op->o_groups; ga; ga=gnext ) {
 725                         gnext = ga->ga_next;
 726                         ch_free( ga );
 727                 }
 728                 ch_free( so->s_op );
 729         }
 730         ch_free( so->s_base.bv_val );
 731         for ( sr=so->s_res; sr; sr=srnext ) {
 732                 srnext = sr->s_next;
 733                 ch_free( sr );
 734         }
 735         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 736         ch_free( so );
 737 }
 738
 739 /* Send a persistent search response */
 740 static int
 741 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so,
 742         Entry **e, int mode )
 743 {
 744         slap_overinst *on = opc->son;
 745
 746         SlapReply rs = { REP_SEARCH };
 747         LDAPControl *ctrls[2];
 748         struct berval cookie;
 749         Entry e_uuid = {0};
 750         Attribute a_uuid = {0};
 751
 752         if ( so->s_op->o_abandon )
 753                 return SLAPD_ABANDON;
 754
 755         ctrls[1] = NULL;
 756         slap_compose_sync_cookie( op, &cookie, &opc->sctxcsn, so->s_rid );
 757
 758         e_uuid.e_attrs = &a_uuid;
 759         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 760         a_uuid.a_nvals = &opc->suuid;
 761         rs.sr_err = syncprov_state_ctrl( op, &rs, &e_uuid,
 762                 mode, ctrls, 0, 1, &cookie );
 763         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
 764
 765         rs.sr_ctrls = ctrls;
 766         op->o_bd->bd_info = (BackendInfo *)on->on_info;
 767         switch( mode ) {
 768         case LDAP_SYNC_ADD:
 769                 rs.sr_entry = *e;
 770                 if ( rs.sr_entry->e_private )
 771                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 772                 if ( opc->sreference ) {
 773                         rs.sr_ref = get_entry_referrals( op, rs.sr_entry );
 774                         send_search_reference( op, &rs );
 775                         ber_bvarray_free( rs.sr_ref );
 776                         if ( !rs.sr_entry )
 777                                 *e = NULL;
 778                         break;
 779                 }
 780                 /* fallthru */
 781         case LDAP_SYNC_MODIFY:
 782                 rs.sr_entry = *e;
 783                 if ( rs.sr_entry->e_private )
 784                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 785                 rs.sr_attrs = op->ors_attrs;
 786                 send_search_entry( op, &rs );
 787                 if ( !rs.sr_entry )
 788                         *e = NULL;
 789                 break;
 790         case LDAP_SYNC_DELETE:
 791                 e_uuid.e_attrs = NULL;
 792                 e_uuid.e_name = opc->sdn;
 793                 e_uuid.e_nname = opc->sndn;
 794                 rs.sr_entry = &e_uuid;
 795                 if ( opc->sreference ) {
 796                         struct berval bv = BER_BVNULL;
 797                         rs.sr_ref = &bv;
 798                         send_search_reference( op, &rs );
 799                 } else {
 800                         send_search_entry( op, &rs );
 801                 }
 802                 break;
 803         default:
 804                 assert(0);
 805         }
 806         /* In case someone else freed it already? */
 807         if ( rs.sr_ctrls ) {
 808                 op->o_tmpfree( rs.sr_ctrls[0], op->o_tmpmemctx );
 809                 rs.sr_ctrls = NULL;
 810         }
 811
 812         return rs.sr_err;
 813 }
 814
 815 /* Play back queued responses */
 816 static int
 817 syncprov_qplay( Operation *op, slap_overinst *on, syncops *so )
 818 {
 819         syncres *sr;
 820         Entry *e;
 821         opcookie opc;
 822         int rc;
 823
 824         opc.son = on;
 825         op->o_bd->bd_info = (BackendInfo *)on->on_info;
 826
 827         for (;;) {
 828                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 829                 sr = so->s_res;
 830                 if ( sr )
 831                         so->s_res = sr->s_next;
 832                 if ( !so->s_res )
 833                         so->s_restail = NULL;
 834                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 835
 836                 if ( !sr || so->s_op->o_abandon )
 837                         break;
 838
 839                 opc.sdn = sr->s_dn;
 840                 opc.sndn = sr->s_ndn;
 841                 opc.suuid = sr->s_uuid;
 842                 opc.sctxcsn = sr->s_csn;
 843                 opc.sreference = sr->s_isreference;
 844                 e = NULL;
 845
 846                 if ( sr->s_mode != LDAP_SYNC_DELETE ) {
 847                         rc = be_entry_get_rw( op, &opc.sndn, NULL, NULL, 0, &e );
 848                         if ( rc ) {
 849                                 ch_free( sr );
 850                                 continue;
 851                         }
 852                 }
 853                 rc = syncprov_sendresp( op, &opc, so, &e, sr->s_mode );
 854
 855                 if ( e ) {
 856                         be_entry_release_rw( op, e, 0 );
 857                 }
 858
 859                 ch_free( sr );
 860
 861                 if ( rc )
 862                         break;
 863         }
 864         op->o_bd->bd_info = (BackendInfo *)on;
 865         return rc;
 866 }
 867
 868 /* runqueue task for playing back queued responses */
 869 static void *
 870 syncprov_qtask( void *ctx, void *arg )
 871 {
 872         struct re_s *rtask = arg;
 873         syncops *so = rtask->arg;
 874         slap_overinst *on = so->s_op->o_private;
 875         OperationBuffer opbuf;
 876         Operation *op;
 877         BackendDB be;
 878
 879         op = (Operation *) &opbuf;
 880         *op = *so->s_op;
 881         op->o_hdr = (Opheader *)(op+1);
 882         op->o_controls = (void **)(op->o_hdr+1);
 883         memset( op->o_controls, 0, SLAP_MAX_CIDS * sizeof(void *));
 884
 885         *op->o_hdr = *so->s_op->o_hdr;
 886
 887         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx);
 888         op->o_tmpmfuncs = &slap_sl_mfuncs;
 889         op->o_threadctx = ctx;
 890
 891         /* syncprov_qplay expects a fake db */
 892         be = *so->s_op->o_bd;
 893         be.be_flags |= SLAP_DBFLAG_OVERLAY;
 894         op->o_bd = &be;
 895         op->o_private = NULL;
 896         op->o_callback = NULL;
 897
 898         syncprov_qplay( op, on, so );
 899
 900         /* decrement use count... */
 901         syncprov_free_syncop( so );
 902
 903         /* wait until we get explicitly scheduled again */
 904         ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
 905         ldap_pvt_runqueue_stoptask( &slapd_rq, so->s_qtask );
 906         ldap_pvt_runqueue_resched( &slapd_rq, so->s_qtask, 1 );
 907         ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
 908
 909         return NULL;
 910 }
 911
 912 /* Queue a persistent search response */
 913 static int
 914 syncprov_qresp( opcookie *opc, syncops *so, int mode )
 915 {
 916         syncres *sr;
 917
 918         sr = ch_malloc(sizeof(syncres) + opc->suuid.bv_len + 1 +
 919                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1 + opc->sctxcsn.bv_len + 1 );
 920         sr->s_next = NULL;
 921         sr->s_dn.bv_val = (char *)(sr + 1);
 922         sr->s_dn.bv_len = opc->sdn.bv_len;
 923         sr->s_mode = mode;
 924         sr->s_isreference = opc->sreference;
 925         sr->s_ndn.bv_val = lutil_strcopy( sr->s_dn.bv_val,
 926                  opc->sdn.bv_val ) + 1;
 927         sr->s_ndn.bv_len = opc->sndn.bv_len;
 928         sr->s_uuid.bv_val = lutil_strcopy( sr->s_ndn.bv_val,
 929                  opc->sndn.bv_val ) + 1;
 930         sr->s_uuid.bv_len = opc->suuid.bv_len;
 931         AC_MEMCPY( sr->s_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
 932         sr->s_csn.bv_val = sr->s_uuid.bv_val + sr->s_uuid.bv_len + 1;
 933         sr->s_csn.bv_len = opc->sctxcsn.bv_len;
 934         strcpy( sr->s_csn.bv_val, opc->sctxcsn.bv_val );
 935
 936         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 937         if ( !so->s_res ) {
 938                 so->s_res = sr;
 939         } else {
 940                 so->s_restail->s_next = sr;
 941         }
 942         so->s_restail = sr;
 943
 944         /* If the base of the psearch was modified, check it next time round */
 945         if ( so->s_flags & PS_WROTE_BASE ) {
 946                 so->s_flags ^= PS_WROTE_BASE;
 947                 so->s_flags |= PS_FIND_BASE;
 948         }
 949         if ( so->s_flags & PS_IS_DETACHED ) {
 950                 ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
 951                 if ( !so->s_qtask ) {
 952                         so->s_qtask = ldap_pvt_runqueue_insert( &slapd_rq, RUNQ_INTERVAL,
 953                                 syncprov_qtask, so, "syncprov_qtask",
 954                                 so->s_op->o_conn->c_peer_name.bv_val );
 955                         ++so->s_inuse;
 956                 } else {
 957                         if (!ldap_pvt_runqueue_isrunning( &slapd_rq, so->s_qtask ) &&
 958                                 !so->s_qtask->next_sched.tv_sec ) {
 959                                 so->s_qtask->interval.tv_sec = 0;
 960                                 ldap_pvt_runqueue_resched( &slapd_rq, so->s_qtask, 0 );
 961                                 so->s_qtask->interval.tv_sec = RUNQ_INTERVAL;
 962                                 ++so->s_inuse;
 963                         }
 964                 }
 965                 ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
 966         }
 967         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 968         return LDAP_SUCCESS;
 969 }
 970
 971 static int
 972 syncprov_drop_psearch( syncops *so, int lock )
 973 {
 974         if ( so->s_flags & PS_IS_DETACHED ) {
 975                 if ( lock )
 976                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
 977                 so->s_op->o_conn->c_n_ops_executing--;
 978                 so->s_op->o_conn->c_n_ops_completed++;
 979                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, slap_op,
 980                         o_next );
 981                 if ( lock )
 982                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
 983         }
 984         syncprov_free_syncop( so );
 985
 986         return 0;
 987 }
 988
 989 static int
 990 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
 991 {
 992         slap_callback *sc = op->o_callback;
 993         op->o_callback = sc->sc_next;
 994         syncprov_drop_psearch( op->o_callback->sc_private, 0 );
 995         op->o_tmpfree( sc, op->o_tmpmemctx );
 996         return 0;
 997 }
 998
 999 static int
1000 syncprov_op_abandon( Operation *op, SlapReply *rs )
1001 {
1002         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1003         syncprov_info_t         *si = on->on_bi.bi_private;
1004         syncops *so, *soprev;
1005
1006         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1007         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
1008                 soprev=so, so=so->s_next ) {
1009                 if ( so->s_op->o_connid == op->o_connid &&
1010                         so->s_op->o_msgid == op->orn_msgid ) {
1011                                 so->s_op->o_abandon = 1;
1012                                 soprev->s_next = so->s_next;
1013                                 break;
1014                 }
1015         }
1016         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1017         if ( so ) {
1018                 /* Is this really a Cancel exop? */
1019                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
1020                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
1021                         rs->sr_err = LDAP_CANCELLED;
1022                         send_ldap_result( so->s_op, rs );
1023                         if ( so->s_flags & PS_IS_DETACHED ) {
1024                                 slap_callback *cb;
1025                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
1026                                 cb->sc_cleanup = syncprov_ab_cleanup;
1027                                 cb->sc_next = op->o_callback;
1028                                 cb->sc_private = so;
1029                                 return SLAP_CB_CONTINUE;
1030                         }
1031                 }
1032                 syncprov_drop_psearch( so, 0 );
1033         }
1034         return SLAP_CB_CONTINUE;
1035 }
1036
1037 /* Find which persistent searches are affected by this operation */
1038 static void
1039 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
1040 {
1041         slap_overinst *on = opc->son;
1042         syncprov_info_t         *si = on->on_bi.bi_private;
1043
1044         fbase_cookie fc;
1045         syncops *ss, *sprev, *snext;
1046         Entry *e;
1047         Attribute *a;
1048         int rc;
1049         struct berval newdn;
1050         int freefdn = 0;
1051
1052         fc.fdn = &op->o_req_ndn;
1053         /* compute new DN */
1054         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1055                 struct berval pdn;
1056                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
1057                 else dnParent( fc.fdn, &pdn );
1058                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
1059                 fc.fdn = &newdn;
1060                 freefdn = 1;
1061         }
1062         if ( op->o_tag != LDAP_REQ_ADD ) {
1063                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
1064                 rc = be_entry_get_rw( op, fc.fdn, NULL, NULL, 0, &e );
1065                 /* If we're sending responses now, make a copy and unlock the DB */
1066                 if ( e && !saveit ) {
1067                         Entry *e2 = entry_dup( e );
1068                         be_entry_release_rw( op, e, 0 );
1069                         e = e2;
1070                 }
1071                 op->o_bd->bd_info = (BackendInfo *)on;
1072                 if ( rc ) return;
1073         } else {
1074                 e = op->ora_e;
1075         }
1076
1077         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1078                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1079                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1080                 opc->sreference = is_entry_referral( e );
1081                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1082                 if ( a )
1083                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1084         } else if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1085                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1086                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1087                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1088                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1089         }
1090
1091         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1092         for (ss = si->si_ops, sprev = (syncops *)&si->si_ops; ss;
1093                 sprev = ss, ss=snext)
1094         {
1095                 syncmatches *sm;
1096                 int found = 0;
1097
1098                 snext = ss->s_next;
1099                 /* validate base */
1100                 fc.fss = ss;
1101                 fc.fbase = 0;
1102                 fc.fscope = 0;
1103
1104                 /* If the base of the search is missing, signal a refresh */
1105                 rc = syncprov_findbase( op, &fc );
1106                 if ( rc != LDAP_SUCCESS ) {
1107                         SlapReply rs = {REP_RESULT};
1108                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1109                                 "search base has changed" );
1110                         sprev->s_next = snext;
1111                         syncprov_drop_psearch( ss, 1 );
1112                         ss = sprev;
1113                         continue;
1114                 }
1115
1116
1117                 /* If we're sending results now, look for this op in old matches */
1118                 if ( !saveit ) {
1119                         syncmatches *old;
1120
1121                         /* Did we modify the search base? */
1122                         if ( dn_match( &op->o_req_ndn, &ss->s_base )) {
1123                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1124                                 ss->s_flags |= PS_WROTE_BASE;
1125                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1126                         }
1127
1128                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1129                                 old=sm, sm=sm->sm_next ) {
1130                                 if ( sm->sm_op == ss ) {
1131                                         found = 1;
1132                                         old->sm_next = sm->sm_next;
1133                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1134                                         break;
1135                                 }
1136                         }
1137                 }
1138
1139                 /* check if current o_req_dn is in scope and matches filter */
1140                 if ( fc.fscope && test_filter( op, e, ss->s_op->ors_filter ) ==
1141                         LDAP_COMPARE_TRUE ) {
1142                         if ( saveit ) {
1143                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1144                                 sm->sm_next = opc->smatches;
1145                                 sm->sm_op = ss;
1146                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1147                                 ++ss->s_inuse;
1148                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1149                                 opc->smatches = sm;
1150                         } else {
1151                                 /* if found send UPDATE else send ADD */
1152                                 syncprov_qresp( opc, ss,
1153                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD );
1154                         }
1155                 } else if ( !saveit && found ) {
1156                         /* send DELETE */
1157                         syncprov_qresp( opc, ss, LDAP_SYNC_DELETE );
1158                 }
1159         }
1160         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1161
1162         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1163                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
1164                 be_entry_release_rw( op, e, 0 );
1165                 op->o_bd->bd_info = (BackendInfo *)on;
1166         }
1167         if ( freefdn ) {
1168                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1169         }
1170 }
1171
1172 static int
1173 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1174 {
1175         slap_callback *cb = op->o_callback;
1176         opcookie *opc = cb->sc_private;
1177         slap_overinst *on = opc->son;
1178         syncprov_info_t         *si = on->on_bi.bi_private;
1179         syncmatches *sm, *snext;
1180         modtarget *mt, mtdummy;
1181
1182         for (sm = opc->smatches; sm; sm=snext) {
1183                 snext = sm->sm_next;
1184                 syncprov_free_syncop( sm->sm_op );
1185                 op->o_tmpfree( sm, op->o_tmpmemctx );
1186         }
1187
1188         /* Remove op from lock table */
1189         mtdummy.mt_op = op;
1190         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1191         mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1192         if ( mt ) {
1193                 modinst *mi = mt->mt_mods;
1194
1195                 /* If there are more, promote the next one */
1196                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1197                 if ( mi->mi_next ) {
1198                         mt->mt_mods = mi->mi_next;
1199                         mt->mt_op = mt->mt_mods->mi_op;
1200                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1201                 } else {
1202                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1203                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1204                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1205                         ch_free( mt );
1206                 }
1207         }
1208         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1209         if ( !BER_BVISNULL( &opc->suuid ))
1210                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1211         if ( !BER_BVISNULL( &opc->sndn ))
1212                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1213         if ( !BER_BVISNULL( &opc->sdn ))
1214                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1215         op->o_callback = cb->sc_next;
1216         op->o_tmpfree(cb, op->o_tmpmemctx);
1217
1218         return 0;
1219 }
1220
1221 static void
1222 syncprov_checkpoint( Operation *op, SlapReply *rs, slap_overinst *on )
1223 {
1224         syncprov_info_t         *si = on->on_bi.bi_private;
1225         Modifications mod;
1226         Operation opm;
1227         SlapReply rsm = { 0 };
1228         struct berval bv[2];
1229         slap_callback cb = {0};
1230
1231         mod.sml_values = bv;
1232         bv[1].bv_val = NULL;
1233         bv[0] = si->si_ctxcsn;
1234         mod.sml_nvalues = NULL;
1235         mod.sml_desc = slap_schema.si_ad_contextCSN;
1236         mod.sml_op = LDAP_MOD_REPLACE;
1237         mod.sml_flags = 0;
1238         mod.sml_next = NULL;
1239
1240         cb.sc_response = slap_null_cb;
1241         opm = *op;
1242         opm.o_tag = LDAP_REQ_MODIFY;
1243         opm.o_callback = &cb;
1244         opm.orm_modlist = &mod;
1245         opm.o_req_dn = op->o_bd->be_suffix[0];
1246         opm.o_req_ndn = op->o_bd->be_nsuffix[0];
1247         opm.o_bd->bd_info = on->on_info->oi_orig;
1248         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1249         SLAP_DBFLAGS( opm.o_bd ) |= SLAP_DBFLAG_NOLASTMOD;
1250         opm.o_bd->be_modify( &opm, &rsm );
1251         SLAP_DBFLAGS( opm.o_bd ) ^= SLAP_DBFLAG_NOLASTMOD;
1252         if ( mod.sml_next != NULL ) {
1253                 slap_mods_free( mod.sml_next, 1 );
1254         }
1255 }
1256
1257 static void
1258 syncprov_add_slog( Operation *op, struct berval *csn )
1259 {
1260         opcookie *opc = op->o_callback->sc_private;
1261         slap_overinst *on = opc->son;
1262         syncprov_info_t         *si = on->on_bi.bi_private;
1263         sessionlog *sl;
1264         slog_entry *se;
1265
1266         sl = si->si_logs;
1267         {
1268                 /* Allocate a record. UUIDs are not NUL-terminated. */
1269                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1270                         csn->bv_len + 1 );
1271                 se->se_next = NULL;
1272                 se->se_tag = op->o_tag;
1273
1274                 se->se_uuid.bv_val = (char *)(se+1);
1275                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1276                 se->se_uuid.bv_len = opc->suuid.bv_len;
1277
1278                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1279                 AC_MEMCPY( se->se_csn.bv_val, csn->bv_val, csn->bv_len );
1280                 se->se_csn.bv_val[csn->bv_len] = '\0';
1281                 se->se_csn.bv_len = csn->bv_len;
1282
1283                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1284                 if ( sl->sl_head ) {
1285                         sl->sl_tail->se_next = se;
1286                 } else {
1287                         sl->sl_head = se;
1288                 }
1289                 sl->sl_tail = se;
1290                 sl->sl_num++;
1291                 while ( sl->sl_num > sl->sl_size ) {
1292                         se = sl->sl_head;
1293                         sl->sl_head = se->se_next;
1294                         strcpy( sl->sl_mincsn.bv_val, se->se_csn.bv_val );
1295                         sl->sl_mincsn.bv_len = se->se_csn.bv_len;
1296                         ch_free( se );
1297                         sl->sl_num--;
1298                         if ( !sl->sl_head ) {
1299                                 sl->sl_tail = NULL;
1300                         }
1301                 }
1302                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1303         }
1304 }
1305
1306 /* Just set a flag if we found the matching entry */
1307 static int
1308 playlog_cb( Operation *op, SlapReply *rs )
1309 {
1310         if ( rs->sr_type == REP_SEARCH ) {
1311                 op->o_callback->sc_private = (void *)1;
1312         }
1313         return rs->sr_err;
1314 }
1315
1316 /* enter with sl->sl_mutex locked, release before returning */
1317 static void
1318 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1319         struct berval *oldcsn, struct berval *ctxcsn )
1320 {
1321         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1322         slog_entry *se;
1323         int i, j, ndel, num, nmods, mmods;
1324         BerVarray uuids;
1325
1326         if ( !sl->sl_num ) {
1327                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1328                 return;
1329         }
1330
1331         num = sl->sl_num;
1332         i = 0;
1333         nmods = 0;
1334
1335         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1336                 num * UUID_LEN, op->o_tmpmemctx );
1337
1338         uuids[0].bv_val = (char *)(uuids + num + 1);
1339
1340         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1341          * and everything else at the end. Do this first so we can
1342          * unlock the list mutex.
1343          */
1344         for ( se=sl->sl_head; se; se=se->se_next ) {
1345                 if ( ber_bvcmp( &se->se_csn, oldcsn ) < 0 ) continue;
1346                 if ( ber_bvcmp( &se->se_csn, ctxcsn ) > 0 ) break;
1347                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1348                         j = i;
1349                         i++;
1350                 } else {
1351                         nmods++;
1352                         j = num - nmods;
1353                 }
1354                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1355                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1356                 uuids[j].bv_len = UUID_LEN;
1357         }
1358         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1359
1360         ndel = i;
1361
1362         /* Zero out unused slots */
1363         for ( i=ndel; i < num - nmods; i++ )
1364                 uuids[i].bv_len = 0;
1365
1366         /* Mods must be validated to see if they belong in this delete set.
1367          */
1368
1369         mmods = nmods;
1370         /* Strip any duplicates */
1371         for ( i=0; i<nmods; i++ ) {
1372                 for ( j=0; j<ndel; j++ ) {
1373                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1374                                 uuids[num - 1 - i].bv_len = 0;
1375                                 mmods --;
1376                                 break;
1377                         }
1378                 }
1379                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1380                 for ( j=0; j<i; j++ ) {
1381                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1382                                 uuids[num - 1 - i].bv_len = 0;
1383                                 mmods --;
1384                                 break;
1385                         }
1386                 }
1387         }
1388
1389         if ( mmods ) {
1390                 Operation fop;
1391                 SlapReply frs = { REP_RESULT };
1392                 int rc;
1393                 Filter mf, af;
1394 #ifdef LDAP_COMP_MATCH
1395                 AttributeAssertion eq = { NULL, BER_BVNULL, NULL };
1396 #else
1397                 AttributeAssertion eq;
1398 #endif
1399                 slap_callback cb = {0};
1400
1401                 fop = *op;
1402
1403                 fop.o_sync_mode = 0;
1404                 fop.o_callback = &cb;
1405                 fop.ors_limit = NULL;
1406                 fop.ors_tlimit = SLAP_NO_LIMIT;
1407                 fop.ors_attrs = slap_anlist_all_attributes;
1408                 fop.ors_attrsonly = 0;
1409                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1410
1411                 af.f_choice = LDAP_FILTER_AND;
1412                 af.f_next = NULL;
1413                 af.f_and = &mf;
1414                 mf.f_choice = LDAP_FILTER_EQUALITY;
1415                 mf.f_ava = &eq;
1416                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1417                 mf.f_next = fop.ors_filter;
1418
1419                 fop.ors_filter = &af;
1420
1421                 cb.sc_response = playlog_cb;
1422                 fop.o_bd->bd_info = on->on_info->oi_orig;
1423
1424                 for ( i=ndel; i<num; i++ ) {
1425                         if ( uuids[i].bv_len == 0 ) continue;
1426
1427                         mf.f_av_value = uuids[i];
1428                         cb.sc_private = NULL;
1429                         fop.ors_slimit = 1;
1430                         rc = fop.o_bd->be_search( &fop, &frs );
1431
1432                         /* If entry was not found, add to delete list */
1433                         if ( !cb.sc_private ) {
1434                                 uuids[ndel++] = uuids[i];
1435                         }
1436                 }
1437                 fop.o_bd->bd_info = (BackendInfo *)on;
1438         }
1439         if ( ndel ) {
1440                 uuids[ndel].bv_val = NULL;
1441                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL, 0, uuids, 1 );
1442         }
1443 }
1444
1445 static int
1446 syncprov_op_response( Operation *op, SlapReply *rs )
1447 {
1448         opcookie *opc = op->o_callback->sc_private;
1449         slap_overinst *on = opc->son;
1450         syncprov_info_t         *si = on->on_bi.bi_private;
1451         syncmatches *sm;
1452
1453         if ( rs->sr_err == LDAP_SUCCESS )
1454         {
1455                 struct berval maxcsn = BER_BVNULL, curcsn = BER_BVNULL;
1456                 char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1457
1458                 /* Update our context CSN */
1459                 cbuf[0] = '\0';
1460                 ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1461                 slap_get_commit_csn( op, &maxcsn, &curcsn );
1462                 if ( !BER_BVISNULL( &maxcsn ) ) {
1463                         strcpy( cbuf, maxcsn.bv_val );
1464                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn ) > 0 ) {
1465                                 strcpy( si->si_ctxcsnbuf, cbuf );
1466                                 si->si_ctxcsn.bv_len = maxcsn.bv_len;
1467                         }
1468                 }
1469
1470                 /* Don't do any processing for consumer contextCSN updates */
1471                 if ( SLAP_SYNC_SHADOW( op->o_bd ) &&
1472                         op->o_msgid == SLAP_SYNC_UPDATE_MSGID ) {
1473                         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1474                         return SLAP_CB_CONTINUE;
1475                 }
1476
1477                 si->si_numops++;
1478                 if ( si->si_chkops || si->si_chktime ) {
1479                         int do_check=0;
1480                         if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1481                                 do_check = 1;
1482                                 si->si_numops = 0;
1483                         }
1484                         if ( si->si_chktime &&
1485                                 (op->o_time - si->si_chklast >= si->si_chktime )) {
1486                                 do_check = 1;
1487                                 si->si_chklast = op->o_time;
1488                         }
1489                         if ( do_check ) {
1490                                 syncprov_checkpoint( op, rs, on );
1491                         }
1492                 }
1493                 ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1494
1495                 opc->sctxcsn.bv_len = maxcsn.bv_len;
1496                 opc->sctxcsn.bv_val = cbuf;
1497
1498                 /* Handle any persistent searches */
1499                 if ( si->si_ops ) {
1500                         switch(op->o_tag) {
1501                         case LDAP_REQ_ADD:
1502                         case LDAP_REQ_MODIFY:
1503                         case LDAP_REQ_MODRDN:
1504                         case LDAP_REQ_EXTENDED:
1505                                 syncprov_matchops( op, opc, 0 );
1506                                 break;
1507                         case LDAP_REQ_DELETE:
1508                                 /* for each match in opc->smatches:
1509                                  *   send DELETE msg
1510                                  */
1511                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1512                                         if ( sm->sm_op->s_op->o_abandon )
1513                                                 continue;
1514                                         syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_DELETE );
1515                                 }
1516                                 break;
1517                         }
1518                 }
1519
1520                 /* Add any log records */
1521                 if ( si->si_logs && op->o_tag != LDAP_REQ_ADD ) {
1522                         syncprov_add_slog( op, &curcsn );
1523                 }
1524
1525         }
1526         return SLAP_CB_CONTINUE;
1527 }
1528
1529 /* We don't use a subentry to store the context CSN any more.
1530  * We expose the current context CSN as an operational attribute
1531  * of the suffix entry.
1532  */
1533 static int
1534 syncprov_op_compare( Operation *op, SlapReply *rs )
1535 {
1536         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1537         syncprov_info_t         *si = on->on_bi.bi_private;
1538         int rc = SLAP_CB_CONTINUE;
1539
1540         if ( dn_match( &op->o_req_ndn, op->o_bd->be_nsuffix ) &&
1541                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1542         {
1543                 Entry e = {0};
1544                 Attribute a = {0};
1545                 struct berval bv[2];
1546
1547                 e.e_name = op->o_bd->be_suffix[0];
1548                 e.e_nname = op->o_bd->be_nsuffix[0];
1549
1550                 BER_BVZERO( &bv[1] );
1551                 bv[0] = si->si_ctxcsn;
1552
1553                 a.a_desc = slap_schema.si_ad_contextCSN;
1554                 a.a_vals = bv;
1555                 a.a_nvals = a.a_vals;
1556
1557                 ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1558
1559                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1560                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1561                 if ( ! rs->sr_err ) {
1562                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1563                         goto return_results;
1564                 }
1565
1566                 if ( get_assert( op ) &&
1567                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
1568                 {
1569                         rs->sr_err = LDAP_ASSERTION_FAILED;
1570                         goto return_results;
1571                 }
1572
1573
1574                 rs->sr_err = LDAP_COMPARE_FALSE;
1575
1576                 if ( value_find_ex( op->oq_compare.rs_ava->aa_desc,
1577                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
1578                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
1579                                 a.a_nvals, &op->oq_compare.rs_ava->aa_value, op->o_tmpmemctx ) == 0 )
1580                 {
1581                         rs->sr_err = LDAP_COMPARE_TRUE;
1582                 }
1583
1584 return_results:;
1585
1586                 ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1587
1588                 send_ldap_result( op, rs );
1589
1590                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
1591                         rs->sr_err = LDAP_SUCCESS;
1592                 }
1593                 rc = rs->sr_err;
1594         }
1595
1596         return rc;
1597 }
1598
1599 static int
1600 syncprov_op_mod( Operation *op, SlapReply *rs )
1601 {
1602         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1603         syncprov_info_t         *si = on->on_bi.bi_private;
1604
1605         slap_callback *cb = op->o_tmpcalloc(1, sizeof(slap_callback)+
1606                 sizeof(opcookie) +
1607                 (si->si_ops ? sizeof(modinst) : 0 ),
1608                 op->o_tmpmemctx);
1609         opcookie *opc = (opcookie *)(cb+1);
1610         opc->son = on;
1611         cb->sc_response = syncprov_op_response;
1612         cb->sc_cleanup = syncprov_op_cleanup;
1613         cb->sc_private = opc;
1614         cb->sc_next = op->o_callback;
1615         op->o_callback = cb;
1616
1617         /* If there are active persistent searches, lock this operation.
1618          * See seqmod.c for the locking logic on its own.
1619          */
1620         if ( si->si_ops ) {
1621                 modtarget *mt, mtdummy;
1622                 modinst *mi;
1623
1624                 mi = (modinst *)(opc+1);
1625                 mi->mi_op = op;
1626
1627                 /* See if we're already modifying this entry... */
1628                 mtdummy.mt_op = op;
1629                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1630                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1631                 if ( mt ) {
1632                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1633                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1634                         mt->mt_tail->mi_next = mi;
1635                         mt->mt_tail = mi;
1636                         /* wait for this op to get to head of list */
1637                         while ( mt->mt_mods != mi ) {
1638                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1639                                 ldap_pvt_thread_yield();
1640                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1641
1642                                 /* clean up if the caller is giving up */
1643                                 if ( op->o_abandon ) {
1644                                         modinst *m2;
1645                                         for ( m2 = mt->mt_mods; m2->mi_next != mi;
1646                                                 m2 = m2->mi_next );
1647                                         m2->mi_next = mi->mi_next;
1648                                         if ( mt->mt_tail == mi ) mt->mt_tail = m2;
1649                                         op->o_tmpfree( cb, op->o_tmpmemctx );
1650                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1651                                         return SLAPD_ABANDON;
1652                                 }
1653                         }
1654                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1655                 } else {
1656                         /* Record that we're modifying this entry now */
1657                         mt = ch_malloc( sizeof(modtarget) );
1658                         mt->mt_mods = mi;
1659                         mt->mt_tail = mi;
1660                         mt->mt_op = mi->mi_op;
1661                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
1662                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
1663                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1664                 }
1665         }
1666
1667         if (( si->si_ops || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
1668                 syncprov_matchops( op, opc, 1 );
1669
1670         return SLAP_CB_CONTINUE;
1671 }
1672
1673 static int
1674 syncprov_op_extended( Operation *op, SlapReply *rs )
1675 {
1676         if ( exop_is_write( op ))
1677                 return syncprov_op_mod( op, rs );
1678
1679         return SLAP_CB_CONTINUE;
1680 }
1681
1682 typedef struct searchstate {
1683         slap_overinst *ss_on;
1684         syncops *ss_so;
1685         int ss_present;
1686         struct berval ss_ctxcsn;
1687         char ss_csnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1688 } searchstate;
1689
1690 static int
1691 syncprov_search_cleanup( Operation *op, SlapReply *rs )
1692 {
1693         if ( rs->sr_ctrls ) {
1694                 op->o_tmpfree( rs->sr_ctrls[0], op->o_tmpmemctx );
1695                 op->o_tmpfree( rs->sr_ctrls, op->o_tmpmemctx );
1696                 rs->sr_ctrls = NULL;
1697         }
1698         return 0;
1699 }
1700
1701 static void
1702 syncprov_detach_op( Operation *op, syncops *so, slap_overinst *on )
1703 {
1704         Operation *op2;
1705         int i, alen = 0;
1706         size_t size;
1707         char *ptr;
1708         GroupAssertion *g1, *g2;
1709
1710         /* count the search attrs */
1711         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1712                 alen += op->ors_attrs[i].an_name.bv_len + 1;
1713         }
1714         /* Make a new copy of the operation */
1715         size = sizeof(Operation) + sizeof(Opheader) +
1716                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
1717                 op->o_req_dn.bv_len + 1 +
1718                 op->o_req_ndn.bv_len + 1 +
1719                 op->o_ndn.bv_len + 1 +
1720                 so->s_filterstr.bv_len + 1;
1721         op2 = (Operation *)ch_calloc( 1, size );
1722         op2->o_hdr = (Opheader *)(op2+1);
1723
1724         /* Copy the fields we care about explicitly, leave the rest alone */
1725         *op2->o_hdr = *op->o_hdr;
1726         op2->o_tag = op->o_tag;
1727         op2->o_time = op->o_time;
1728         op2->o_bd = on->on_info->oi_origdb;
1729         op2->o_request = op->o_request;
1730         op2->o_private = on;
1731
1732         if ( i ) {
1733                 op2->ors_attrs = (AttributeName *)(op2->o_hdr + 1);
1734                 ptr = (char *)(op2->ors_attrs+i+1);
1735                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1736                         op2->ors_attrs[i] = op->ors_attrs[i];
1737                         op2->ors_attrs[i].an_name.bv_val = ptr;
1738                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
1739                 }
1740                 BER_BVZERO( &op2->ors_attrs[i].an_name );
1741         } else {
1742                 ptr = (char *)(op2->o_hdr + 1);
1743         }
1744         op2->o_authz = op->o_authz;
1745         op2->o_ndn.bv_val = ptr;
1746         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
1747         op2->o_dn = op2->o_ndn;
1748         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
1749         op2->o_req_dn.bv_val = ptr;
1750         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
1751         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
1752         op2->o_req_ndn.bv_val = ptr;
1753         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
1754         op2->ors_filterstr.bv_val = ptr;
1755         strcpy( ptr, so->s_filterstr.bv_val );
1756         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
1757         op2->ors_filter = str2filter( ptr );
1758         so->s_op = op2;
1759
1760         /* Copy any cached group ACLs individually */
1761         op2->o_groups = NULL;
1762         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
1763                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
1764                 *g2 = *g1;
1765                 strcpy( g2->ga_ndn, g1->ga_ndn );
1766                 g2->ga_next = op2->o_groups;
1767                 op2->o_groups = g2;
1768         }
1769         /* Don't allow any further group caching */
1770         op2->o_do_not_cache = 1;
1771
1772         /* Add op2 to conn so abandon will find us */
1773         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
1774         op->o_conn->c_n_ops_executing++;
1775         op->o_conn->c_n_ops_completed--;
1776         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
1777         so->s_flags |= PS_IS_DETACHED;
1778         ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
1779 }
1780
1781 static int
1782 syncprov_search_response( Operation *op, SlapReply *rs )
1783 {
1784         searchstate *ss = op->o_callback->sc_private;
1785         slap_overinst *on = ss->ss_on;
1786         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
1787
1788         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
1789                 Attribute *a;
1790                 /* If we got a referral without a referral object, there's
1791                  * something missing that we cannot replicate. Just ignore it.
1792                  * The consumer will abort because we didn't send the expected
1793                  * control.
1794                  */
1795                 if ( !rs->sr_entry ) {
1796                         assert( rs->sr_entry != NULL );
1797                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
1798                         return SLAP_CB_CONTINUE;
1799                 }
1800                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryCSN );
1801                 if ( a ) {
1802                         /* Make sure entry is less than the snaphot'd contextCSN */
1803                         if ( ber_bvcmp( &a->a_nvals[0], &ss->ss_ctxcsn ) > 0 )
1804                                 return LDAP_SUCCESS;
1805
1806                         /* Don't send the ctx entry twice */
1807                         if ( !BER_BVISNULL( &srs->sr_state.ctxcsn ) &&
1808                                 bvmatch( &a->a_nvals[0], &srs->sr_state.ctxcsn ) )
1809                                 return LDAP_SUCCESS;
1810                 }
1811                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1812                         op->o_tmpmemctx );
1813                 rs->sr_ctrls[1] = NULL;
1814                 rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
1815                         LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
1816         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
1817                 struct berval cookie;
1818
1819                 slap_compose_sync_cookie( op, &cookie, &ss->ss_ctxcsn,
1820                         srs->sr_state.rid );
1821
1822                 /* Is this a regular refresh? */
1823                 if ( !ss->ss_so ) {
1824                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1825                                 op->o_tmpmemctx );
1826                         rs->sr_ctrls[1] = NULL;
1827                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
1828                                 0, 1, &cookie, ss->ss_present ?  LDAP_SYNC_REFRESH_PRESENTS :
1829                                         LDAP_SYNC_REFRESH_DELETES );
1830                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1831                 } else {
1832                 /* It's RefreshAndPersist, transition to Persist phase */
1833                         syncprov_sendinfo( op, rs, ( ss->ss_present && rs->sr_nentries ) ?
1834                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
1835                                 &cookie, 1, NULL, 0 );
1836                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1837
1838                         /* Detach this Op from frontend control */
1839                         ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
1840
1841                         /* Turn off the refreshing flag */
1842                         ss->ss_so->s_flags ^= PS_IS_REFRESHING;
1843
1844                         syncprov_detach_op( op, ss->ss_so, on );
1845                         ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
1846
1847                         return LDAP_SUCCESS;
1848                 }
1849         }
1850
1851         return SLAP_CB_CONTINUE;
1852 }
1853
1854 static int
1855 syncprov_op_search( Operation *op, SlapReply *rs )
1856 {
1857         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1858         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
1859         slap_callback   *cb;
1860         int gotstate = 0, nochange = 0, do_present;
1861         syncops *sop = NULL;
1862         searchstate *ss;
1863         sync_control *srs;
1864         struct berval ctxcsn;
1865         char csnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1866
1867         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
1868
1869         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
1870                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
1871                 return rs->sr_err;
1872         }
1873
1874         do_present = si->si_nopres ? 0 : 1;
1875
1876         srs = op->o_controls[slap_cids.sc_LDAPsync];
1877         op->o_managedsait = SLAP_CONTROL_NONCRITICAL;
1878
1879         /* If this is a persistent search, set it up right away */
1880         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
1881                 syncops so = {0};
1882                 fbase_cookie fc;
1883                 opcookie opc;
1884                 slap_callback sc;
1885
1886                 fc.fss = &so;
1887                 fc.fbase = 0;
1888                 so.s_eid = NOID;
1889                 so.s_op = op;
1890                 so.s_flags = PS_IS_REFRESHING | PS_FIND_BASE;
1891                 /* syncprov_findbase expects to be called as a callback... */
1892                 sc.sc_private = &opc;
1893                 opc.son = on;
1894                 cb = op->o_callback;
1895                 op->o_callback = &sc;
1896                 rs->sr_err = syncprov_findbase( op, &fc );
1897                 op->o_callback = cb;
1898
1899                 if ( rs->sr_err != LDAP_SUCCESS ) {
1900                         send_ldap_result( op, rs );
1901                         return rs->sr_err;
1902                 }
1903                 sop = ch_malloc( sizeof( syncops ));
1904                 *sop = so;
1905                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
1906                 sop->s_rid = srs->sr_state.rid;
1907                 sop->s_inuse = 1;
1908
1909                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1910                 sop->s_next = si->si_ops;
1911                 si->si_ops = sop;
1912                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1913         }
1914
1915         /* snapshot the ctxcsn */
1916         ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1917         strcpy( csnbuf, si->si_ctxcsnbuf );
1918         ctxcsn.bv_len = si->si_ctxcsn.bv_len;
1919         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1920         ctxcsn.bv_val = csnbuf;
1921
1922         /* If we have a cookie, handle the PRESENT lookups */
1923         if ( !BER_BVISNULL( &srs->sr_state.ctxcsn )) {
1924                 sessionlog *sl;
1925
1926                 /* The cookie was validated when it was parsed, just use it */
1927
1928                 /* If just Refreshing and nothing has changed, shortcut it */
1929                 if ( bvmatch( &srs->sr_state.ctxcsn, &ctxcsn )) {
1930                         nochange = 1;
1931                         if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
1932                                 LDAPControl     *ctrls[2];
1933
1934                                 ctrls[0] = NULL;
1935                                 ctrls[1] = NULL;
1936                                 syncprov_done_ctrl( op, rs, ctrls, 0, 0,
1937                                         NULL, LDAP_SYNC_REFRESH_DELETES );
1938                                 rs->sr_ctrls = ctrls;
1939                                 rs->sr_err = LDAP_SUCCESS;
1940                                 send_ldap_result( op, rs );
1941                                 rs->sr_ctrls = NULL;
1942                                 return rs->sr_err;
1943                         }
1944                         goto shortcut;
1945                 }
1946                 /* Do we have a sessionlog for this search? */
1947                 sl=si->si_logs;
1948                 if ( sl ) {
1949                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1950                         if ( ber_bvcmp( &srs->sr_state.ctxcsn, &sl->sl_mincsn ) >= 0 ) {
1951                                 do_present = 0;
1952                                 /* mutex is unlocked in playlog */
1953                                 syncprov_playlog( op, rs, sl, &srs->sr_state.ctxcsn, &ctxcsn );
1954                         } else {
1955                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1956                         }
1957                 }
1958                 /* Is the CSN still present in the database? */
1959                 if ( syncprov_findcsn( op, FIND_CSN ) != LDAP_SUCCESS ) {
1960                         /* No, so a reload is required */
1961                         /* the 2.2 consumer doesn't send this hint */
1962                         if ( si->si_usehint && srs->sr_rhint == 0 ) {
1963                                 send_ldap_error( op, rs, LDAP_SYNC_REFRESH_REQUIRED, "sync cookie is stale" );
1964                                 return rs->sr_err;
1965                         }
1966                 } else {
1967                         gotstate = 1;
1968                         /* If changed and doing Present lookup, send Present UUIDs */
1969                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT ) !=
1970                                 LDAP_SUCCESS ) {
1971                                 send_ldap_result( op, rs );
1972                                 return rs->sr_err;
1973                         }
1974                 }
1975         }
1976
1977 shortcut:
1978         /* Append CSN range to search filter, save original filter
1979          * for persistent search evaluation
1980          */
1981         if ( sop ) {
1982                 sop->s_filterstr= op->ors_filterstr;
1983         }
1984
1985         /* If something changed, find the changes */
1986         if ( gotstate && !nochange ) {
1987                 Filter *fand, *fava;
1988
1989                 fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
1990                 fand->f_choice = LDAP_FILTER_AND;
1991                 fand->f_next = NULL;
1992                 fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
1993                 fand->f_and = fava;
1994                 fava->f_choice = LDAP_FILTER_GE;
1995                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
1996                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
1997 #ifdef LDAP_COMP_MATCH
1998                 fava->f_ava->aa_cf = NULL;
1999 #endif
2000                 ber_dupbv_x( &fava->f_ava->aa_value, &srs->sr_state.ctxcsn, op->o_tmpmemctx );
2001                 fava->f_next = op->ors_filter;
2002                 op->ors_filter = fand;
2003                 filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
2004         }
2005
2006         /* Let our callback add needed info to returned entries */
2007         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
2008         ss = (searchstate *)(cb+1);
2009         ss->ss_on = on;
2010         ss->ss_so = sop;
2011         ss->ss_present = do_present;
2012         ss->ss_ctxcsn.bv_len = ctxcsn.bv_len;
2013         ss->ss_ctxcsn.bv_val = ss->ss_csnbuf;
2014         strcpy( ss->ss_ctxcsn.bv_val, ctxcsn.bv_val );
2015         cb->sc_response = syncprov_search_response;
2016         cb->sc_cleanup = syncprov_search_cleanup;
2017         cb->sc_private = ss;
2018         cb->sc_next = op->o_callback;
2019         op->o_callback = cb;
2020
2021 #if 0   /* I don't think we need to shortcircuit back-bdb any more */
2022         op->o_sync_mode &= SLAP_CONTROL_MASK;
2023 #endif
2024
2025         /* If this is a persistent search and no changes were reported during
2026          * the refresh phase, just invoke the response callback to transition
2027          * us into persist phase
2028          */
2029         if ( nochange ) {
2030                 rs->sr_err = LDAP_SUCCESS;
2031                 rs->sr_nentries = 0;
2032                 send_ldap_result( op, rs );
2033                 return rs->sr_err;
2034         }
2035         return SLAP_CB_CONTINUE;
2036 }
2037
2038 static int
2039 syncprov_operational(
2040         Operation *op,
2041         SlapReply *rs )
2042 {
2043         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2044         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2045
2046         if ( rs->sr_entry &&
2047                 dn_match( &rs->sr_entry->e_nname, op->o_bd->be_nsuffix )) {
2048
2049                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
2050                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
2051                         Attribute *a, **ap = NULL;
2052
2053                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
2054                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
2055                                         break;
2056                         }
2057
2058                         if ( !a ) {
2059                                 for ( ap = &rs->sr_operational_attrs; *ap; ap=&(*ap)->a_next );
2060
2061                                 a = ch_malloc( sizeof(Attribute));
2062                                 a->a_desc = slap_schema.si_ad_contextCSN;
2063                                 a->a_vals = ch_malloc( 2 * sizeof(struct berval));
2064                                 a->a_vals[1].bv_val = NULL;
2065                                 a->a_nvals = a->a_vals;
2066                                 a->a_next = NULL;
2067                                 a->a_flags = 0;
2068                                 *ap = a;
2069                         }
2070
2071                         ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
2072                         if ( !ap ) {
2073                                 strcpy( a->a_vals[0].bv_val, si->si_ctxcsnbuf );
2074                         } else {
2075                                 ber_dupbv( &a->a_vals[0], &si->si_ctxcsn );
2076                         }
2077                         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
2078                 }
2079         }
2080         return SLAP_CB_CONTINUE;
2081 }
2082
2083 enum {
2084         SP_CHKPT = 1,
2085         SP_SESSL,
2086         SP_NOPRES,
2087         SP_USEHINT
2088 };
2089
2090 static ConfigDriver sp_cf_gen;
2091
2092 static ConfigTable spcfg[] = {
2093         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2094                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2095                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2096                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2097         { "syncprov-sessionlog", "ops", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2098                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2099                         "DESC 'Session log size in ops' "
2100                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2101         { "syncprov-nopresent", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_NOPRES,
2102                 sp_cf_gen, "( OLcfgOvAt:1.3 NAME 'olcSpNoPresent' "
2103                         "DESC 'Omit Present phase processing' "
2104                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2105         { "syncprov-reloadhint", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_USEHINT,
2106                 sp_cf_gen, "( OLcfgOvAt:1.4 NAME 'olcSpReloadHint' "
2107                         "DESC 'Observe Reload Hint in Request control' "
2108                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2109         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2110 };
2111
2112 static ConfigOCs spocs[] = {
2113         { "( OLcfgOvOc:1.1 "
2114                 "NAME 'olcSyncProvConfig' "
2115                 "DESC 'SyncRepl Provider configuration' "
2116                 "SUP olcOverlayConfig "
2117                 "MAY ( olcSpCheckpoint $ olcSpSessionlog $ olcSpNoPresent ) )",
2118                         Cft_Overlay, spcfg },
2119         { NULL, 0, NULL }
2120 };
2121
2122 static int
2123 sp_cf_gen(ConfigArgs *c)
2124 {
2125         slap_overinst           *on = (slap_overinst *)c->bi;
2126         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2127         int rc = 0;
2128
2129         if ( c->op == SLAP_CONFIG_EMIT ) {
2130                 switch ( c->type ) {
2131                 case SP_CHKPT:
2132                         if ( si->si_chkops || si->si_chktime ) {
2133                                 struct berval bv;
2134                                 bv.bv_len = sprintf( c->msg, "%d %d",
2135                                         si->si_chkops, si->si_chktime );
2136                                 bv.bv_val = c->msg;
2137                                 value_add_one( &c->rvalue_vals, &bv );
2138                         } else {
2139                                 rc = 1;
2140                         }
2141                         break;
2142                 case SP_SESSL:
2143                         if ( si->si_logs ) {
2144                                 c->value_int = si->si_logs->sl_size;
2145                         } else {
2146                                 rc = 1;
2147                         }
2148                         break;
2149                 case SP_NOPRES:
2150                         if ( si->si_nopres ) {
2151                                 c->value_int = 1;
2152                         } else {
2153                                 rc = 1;
2154                         }
2155                         break;
2156                 case SP_USEHINT:
2157                         if ( si->si_usehint ) {
2158                                 c->value_int = 1;
2159                         } else {
2160                                 rc = 1;
2161                         }
2162                         break;
2163                 }
2164                 return rc;
2165         } else if ( c->op == LDAP_MOD_DELETE ) {
2166                 switch ( c->type ) {
2167                 case SP_CHKPT:
2168                         si->si_chkops = 0;
2169                         si->si_chktime = 0;
2170                         break;
2171                 case SP_SESSL:
2172                         if ( si->si_logs )
2173                                 si->si_logs->sl_size = 0;
2174                         else
2175                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2176                         break;
2177                 case SP_NOPRES:
2178                         if ( si->si_nopres )
2179                                 si->si_nopres = 0;
2180                         else
2181                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2182                         break;
2183                 case SP_USEHINT:
2184                         if ( si->si_usehint )
2185                                 si->si_usehint = 0;
2186                         else
2187                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2188                         break;
2189                 }
2190                 return rc;
2191         }
2192         switch ( c->type ) {
2193         case SP_CHKPT:
2194                 si->si_chkops = atoi( c->argv[1] );
2195                 si->si_chktime = atoi( c->argv[2] ) * 60;
2196                 break;
2197         case SP_SESSL: {
2198                 sessionlog *sl;
2199                 int size = c->value_int;
2200
2201                 if ( size < 0 ) {
2202                         sprintf( c->msg, "%s size %d is negative",
2203                                 c->argv[0], size );
2204                         Debug( LDAP_DEBUG_CONFIG, "%s: %s\n", c->log, c->msg, 0 );
2205                         return ARG_BAD_CONF;
2206                 }
2207                 sl = si->si_logs;
2208                 if ( !sl ) {
2209                         sl = ch_malloc( sizeof( sessionlog ) + LDAP_LUTIL_CSNSTR_BUFSIZE );
2210                         sl->sl_mincsn.bv_val = (char *)(sl+1);
2211                         sl->sl_mincsn.bv_len = 0;
2212                         sl->sl_num = 0;
2213                         sl->sl_head = sl->sl_tail = NULL;
2214                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
2215                         si->si_logs = sl;
2216                 }
2217                 sl->sl_size = size;
2218                 }
2219                 break;
2220         case SP_NOPRES:
2221                 si->si_nopres = c->value_int;
2222                 break;
2223         case SP_USEHINT:
2224                 si->si_usehint = c->value_int;
2225                 break;
2226         }
2227         return rc;
2228 }
2229
2230 /* ITS#3456 we cannot run this search on the main thread, must use a
2231  * child thread in order to insure we have a big enough stack.
2232  */
2233 static void *
2234 syncprov_db_otask(
2235         void *ptr
2236 )
2237 {
2238         syncprov_findcsn( ptr, FIND_MAXCSN );
2239         return NULL;
2240 }
2241
2242 /* Read any existing contextCSN from the underlying db.
2243  * Then search for any entries newer than that. If no value exists,
2244  * just generate it. Cache whatever result.
2245  */
2246 static int
2247 syncprov_db_open(
2248     BackendDB *be
2249 )
2250 {
2251         slap_overinst   *on = (slap_overinst *) be->bd_info;
2252         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2253
2254         Connection conn;
2255         OperationBuffer opbuf;
2256         char ctxcsnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
2257         Operation *op = (Operation *) &opbuf;
2258         Entry *e;
2259         Attribute *a;
2260         int rc;
2261         void *thrctx = NULL;
2262
2263         if ( slapMode & SLAP_TOOL_MODE ) {
2264                 return 0;
2265         }
2266
2267         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
2268         if ( rc ) {
2269                 return rc;
2270         }
2271
2272         thrctx = ldap_pvt_thread_pool_context();
2273         connection_fake_init( &conn, op, thrctx );
2274         op->o_bd = be;
2275         op->o_dn = be->be_rootdn;
2276         op->o_ndn = be->be_rootndn;
2277
2278         ctxcsnbuf[0] = '\0';
2279
2280         op->o_bd->bd_info = on->on_info->oi_orig;
2281         rc = be_entry_get_rw( op, be->be_nsuffix, NULL,
2282                 slap_schema.si_ad_contextCSN, 0, &e );
2283
2284         if ( e ) {
2285                 ldap_pvt_thread_t tid;
2286
2287                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
2288                 if ( a ) {
2289                         si->si_ctxcsn.bv_len = a->a_nvals[0].bv_len;
2290                         if ( si->si_ctxcsn.bv_len >= sizeof(si->si_ctxcsnbuf ))
2291                                 si->si_ctxcsn.bv_len = sizeof(si->si_ctxcsnbuf)-1;
2292                         strncpy( si->si_ctxcsnbuf, a->a_nvals[0].bv_val,
2293                                 si->si_ctxcsn.bv_len );
2294                         si->si_ctxcsnbuf[si->si_ctxcsn.bv_len] = '\0';
2295                         strcpy( ctxcsnbuf, si->si_ctxcsnbuf );
2296                 }
2297                 be_entry_release_rw( op, e, 0 );
2298                 op->o_bd->bd_info = (BackendInfo *)on;
2299                 op->o_req_dn = be->be_suffix[0];
2300                 op->o_req_ndn = be->be_nsuffix[0];
2301                 op->ors_scope = LDAP_SCOPE_SUBTREE;
2302                 ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
2303                 ldap_pvt_thread_join( tid, NULL );
2304         } else if ( SLAP_SYNC_SHADOW( op->o_bd )) {
2305                 /* If we're also a consumer, and we didn't find the context entry,
2306                  * then don't generate anything, wait for our provider to send it
2307                  * to us.
2308                  */
2309                 goto out;
2310         }
2311
2312         if ( BER_BVISEMPTY( &si->si_ctxcsn ) ) {
2313                 si->si_ctxcsn.bv_len = sizeof( si->si_ctxcsnbuf );
2314                 slap_get_csn( op, &si->si_ctxcsn, 0 );
2315         }
2316
2317         /* If our ctxcsn is different from what was read from the root
2318          * entry, make sure we do a checkpoint on close
2319          */
2320         if ( strcmp( si->si_ctxcsnbuf, ctxcsnbuf )) {
2321                 si->si_numops++;
2322         }
2323
2324 out:
2325         op->o_bd->bd_info = (BackendInfo *)on;
2326         ldap_pvt_thread_pool_context_reset( thrctx );
2327         return 0;
2328 }
2329
2330 /* Write the current contextCSN into the underlying db.
2331  */
2332 static int
2333 syncprov_db_close(
2334     BackendDB *be
2335 )
2336 {
2337     slap_overinst   *on = (slap_overinst *) be->bd_info;
2338     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2339
2340         if ( slapMode & SLAP_TOOL_MODE ) {
2341                 return 0;
2342         }
2343         if ( si->si_numops ) {
2344                 Connection conn;
2345                 OperationBuffer opbuf;
2346                 Operation *op = (Operation *) &opbuf;
2347                 SlapReply rs = {REP_RESULT};
2348                 void *thrctx;
2349
2350                 thrctx = ldap_pvt_thread_pool_context();
2351                 connection_fake_init( &conn, op, thrctx );
2352                 op->o_bd = be;
2353                 op->o_dn = be->be_rootdn;
2354                 op->o_ndn = be->be_rootndn;
2355                 syncprov_checkpoint( op, &rs, on );
2356                 ldap_pvt_thread_pool_context_reset( thrctx );
2357         }
2358
2359     return 0;
2360 }
2361
2362 static int
2363 syncprov_db_init(
2364         BackendDB *be
2365 )
2366 {
2367         slap_overinst   *on = (slap_overinst *)be->bd_info;
2368         syncprov_info_t *si;
2369
2370         si = ch_calloc(1, sizeof(syncprov_info_t));
2371         on->on_bi.bi_private = si;
2372         ldap_pvt_thread_mutex_init( &si->si_csn_mutex );
2373         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
2374         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
2375         si->si_ctxcsn.bv_val = si->si_ctxcsnbuf;
2376
2377         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
2378         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
2379         csn_anlist[1].an_desc = slap_schema.si_ad_entryUUID;
2380         csn_anlist[1].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2381
2382         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
2383         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2384
2385         return 0;
2386 }
2387
2388 static int
2389 syncprov_db_destroy(
2390         BackendDB *be
2391 )
2392 {
2393         slap_overinst   *on = (slap_overinst *)be->bd_info;
2394         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2395
2396         if ( si ) {
2397                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
2398                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
2399                 ldap_pvt_thread_mutex_destroy( &si->si_csn_mutex );
2400                 ch_free( si );
2401         }
2402
2403         return 0;
2404 }
2405
2406 static int syncprov_parseCtrl (
2407         Operation *op,
2408         SlapReply *rs,
2409         LDAPControl *ctrl )
2410 {
2411         ber_tag_t tag;
2412         BerElementBuffer berbuf;
2413         BerElement *ber = (BerElement *)&berbuf;
2414         ber_int_t mode;
2415         ber_len_t len;
2416         struct berval cookie = BER_BVNULL;
2417         sync_control *sr;
2418         int rhint = 0;
2419
2420         if ( op->o_sync != SLAP_CONTROL_NONE ) {
2421                 rs->sr_text = "Sync control specified multiple times";
2422                 return LDAP_PROTOCOL_ERROR;
2423         }
2424
2425         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
2426                 rs->sr_text = "Sync control specified with pagedResults control";
2427                 return LDAP_PROTOCOL_ERROR;
2428         }
2429
2430         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
2431                 rs->sr_text = "Sync control value is empty (or absent)";
2432                 return LDAP_PROTOCOL_ERROR;
2433         }
2434
2435         /* Parse the control value
2436          *      syncRequestValue ::= SEQUENCE {
2437          *              mode   ENUMERATED {
2438          *                      -- 0 unused
2439          *                      refreshOnly             (1),
2440          *                      -- 2 reserved
2441          *                      refreshAndPersist       (3)
2442          *              },
2443          *              cookie  syncCookie OPTIONAL
2444          *      }
2445          */
2446
2447         ber_init2( ber, &ctrl->ldctl_value, 0 );
2448
2449         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
2450                 rs->sr_text = "Sync control : mode decoding error";
2451                 return LDAP_PROTOCOL_ERROR;
2452         }
2453
2454         switch( mode ) {
2455         case LDAP_SYNC_REFRESH_ONLY:
2456                 mode = SLAP_SYNC_REFRESH;
2457                 break;
2458         case LDAP_SYNC_REFRESH_AND_PERSIST:
2459                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
2460                 break;
2461         default:
2462                 rs->sr_text = "Sync control : unknown update mode";
2463                 return LDAP_PROTOCOL_ERROR;
2464         }
2465
2466         tag = ber_peek_tag( ber, &len );
2467
2468         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
2469                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
2470                         rs->sr_text = "Sync control : cookie decoding error";
2471                         return LDAP_PROTOCOL_ERROR;
2472                 }
2473                 tag = ber_peek_tag( ber, &len );
2474         }
2475         if ( tag == LDAP_TAG_RELOAD_HINT ) {
2476                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
2477                         rs->sr_text = "Sync control : rhint decoding error";
2478                         return LDAP_PROTOCOL_ERROR;
2479                 }
2480         }
2481         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
2482                         rs->sr_text = "Sync control : decoding error";
2483                         return LDAP_PROTOCOL_ERROR;
2484         }
2485         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
2486         sr->sr_rhint = rhint;
2487         if (!BER_BVISNULL(&cookie)) {
2488                 ber_dupbv_x( &sr->sr_state.octet_str, &cookie, op->o_tmpmemctx );
2489                 slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx );
2490                 if ( sr->sr_state.rid == -1 ) {
2491                         rs->sr_text = "Sync control : cookie parsing error";
2492                         return LDAP_PROTOCOL_ERROR;
2493                 }
2494         }
2495
2496         op->o_controls[slap_cids.sc_LDAPsync] = sr;
2497
2498         op->o_sync = ctrl->ldctl_iscritical
2499                 ? SLAP_CONTROL_CRITICAL
2500                 : SLAP_CONTROL_NONCRITICAL;
2501
2502         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
2503
2504         return LDAP_SUCCESS;
2505 }
2506
2507 /* This overlay is set up for dynamic loading via moduleload. For static
2508  * configuration, you'll need to arrange for the slap_overinst to be
2509  * initialized and registered by some other function inside slapd.
2510  */
2511
2512 static slap_overinst            syncprov;
2513
2514 int
2515 syncprov_init()
2516 {
2517         int rc;
2518
2519         rc = register_supported_control( LDAP_CONTROL_SYNC,
2520                 SLAP_CTRL_HIDE|SLAP_CTRL_SEARCH, NULL,
2521                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
2522         if ( rc != LDAP_SUCCESS ) {
2523                 Debug( LDAP_DEBUG_ANY,
2524                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
2525                 return rc;
2526         }
2527
2528         syncprov.on_bi.bi_type = "syncprov";
2529         syncprov.on_bi.bi_db_init = syncprov_db_init;
2530         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
2531         syncprov.on_bi.bi_db_open = syncprov_db_open;
2532         syncprov.on_bi.bi_db_close = syncprov_db_close;
2533
2534         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
2535         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
2536
2537         syncprov.on_bi.bi_op_add = syncprov_op_mod;
2538         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
2539         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
2540         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
2541         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
2542         syncprov.on_bi.bi_op_search = syncprov_op_search;
2543         syncprov.on_bi.bi_extended = syncprov_op_extended;
2544         syncprov.on_bi.bi_operational = syncprov_operational;
2545
2546         syncprov.on_bi.bi_cf_ocs = spocs;
2547
2548         generic_filter.f_desc = slap_schema.si_ad_objectClass;
2549
2550         rc = config_register_schema( spcfg, spocs );
2551         if ( rc ) return rc;
2552
2553         return overlay_register( &syncprov );
2554 }
2555
2556 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
2557 int
2558 init_module( int argc, char *argv[] )
2559 {
2560         return syncprov_init();
2561 }
2562 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
2563
2564 #endif /* defined(SLAPD_OVER_SYNCPROV) */