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