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