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

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