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 2004-2018 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 #ifdef LDAP_DEVEL
  32 #define CHECK_CSN       1
  33 #endif
  34
  35 /* A modify request on a particular entry */
  36 typedef struct modinst {
  37         struct modinst *mi_next;
  38         Operation *mi_op;
  39 } modinst;
  40
  41 typedef struct modtarget {
  42         struct modinst *mt_mods;
  43         struct modinst *mt_tail;
  44         struct berval mt_dn;
  45         ldap_pvt_thread_mutex_t mt_mutex;
  46 } modtarget;
  47
  48 /* All the info of a psearch result that's shared between
  49  * multiple queues
  50  */
  51 typedef struct resinfo {
  52         struct syncres *ri_list;
  53         Entry *ri_e;
  54         struct berval ri_dn;
  55         struct berval ri_ndn;
  56         struct berval ri_uuid;
  57         struct berval ri_csn;
  58         struct berval ri_cookie;
  59         char ri_isref;
  60         ldap_pvt_thread_mutex_t ri_mutex;
  61 } resinfo;
  62
  63 /* A queued result of a persistent search */
  64 typedef struct syncres {
  65         struct syncres *s_next; /* list of results on this psearch queue */
  66         struct syncres *s_rilist;       /* list of psearches using this result */
  67         resinfo *s_info;
  68         char s_mode;
  69 } syncres;
  70
  71 /* Record of a persistent search */
  72 typedef struct syncops {
  73         struct syncops *s_next;
  74         struct syncprov_info_t *s_si;
  75         struct berval   s_base;         /* ndn of search base */
  76         ID              s_eid;          /* entryID of search base */
  77         Operation       *s_op;          /* search op */
  78         int             s_rid;
  79         int             s_sid;
  80         struct berval s_filterstr;
  81         int             s_flags;        /* search status */
  82 #define PS_IS_REFRESHING        0x01
  83 #define PS_IS_DETACHED          0x02
  84 #define PS_WROTE_BASE           0x04
  85 #define PS_FIND_BASE            0x08
  86 #define PS_FIX_FILTER           0x10
  87 #define PS_TASK_QUEUED          0x20
  88
  89         int             s_inuse;        /* reference count */
  90         struct syncres *s_res;
  91         struct syncres *s_restail;
  92         ldap_pvt_thread_mutex_t s_mutex;
  93 } syncops;
  94
  95 /* A received sync control */
  96 typedef struct sync_control {
  97         struct sync_cookie sr_state;
  98         int sr_rhint;
  99 } sync_control;
 100
 101 #if 0 /* moved back to slap.h */
 102 #define o_sync  o_ctrlflag[slap_cids.sc_LDAPsync]
 103 #endif
 104 /* o_sync_mode uses data bits of o_sync */
 105 #define o_sync_mode     o_ctrlflag[slap_cids.sc_LDAPsync]
 106
 107 #define SLAP_SYNC_NONE                                  (LDAP_SYNC_NONE<<SLAP_CONTROL_SHIFT)
 108 #define SLAP_SYNC_REFRESH                               (LDAP_SYNC_REFRESH_ONLY<<SLAP_CONTROL_SHIFT)
 109 #define SLAP_SYNC_PERSIST                               (LDAP_SYNC_RESERVED<<SLAP_CONTROL_SHIFT)
 110 #define SLAP_SYNC_REFRESH_AND_PERSIST   (LDAP_SYNC_REFRESH_AND_PERSIST<<SLAP_CONTROL_SHIFT)
 111
 112 /* Record of which searches matched at premodify step */
 113 typedef struct syncmatches {
 114         struct syncmatches *sm_next;
 115         syncops *sm_op;
 116 } syncmatches;
 117
 118 /* Session log data */
 119 typedef struct slog_entry {
 120         struct slog_entry *se_next;
 121         struct berval se_uuid;
 122         struct berval se_csn;
 123         int     se_sid;
 124         ber_tag_t       se_tag;
 125 } slog_entry;
 126
 127 typedef struct sessionlog {
 128         BerVarray       sl_mincsn;
 129         int             *sl_sids;
 130         int             sl_numcsns;
 131         int             sl_num;
 132         int             sl_size;
 133         int             sl_playing;
 134         slog_entry *sl_head;
 135         slog_entry *sl_tail;
 136         ldap_pvt_thread_mutex_t sl_mutex;
 137 } sessionlog;
 138
 139 /* The main state for this overlay */
 140 typedef struct syncprov_info_t {
 141         syncops         *si_ops;
 142         struct berval   si_contextdn;
 143         BerVarray       si_ctxcsn;      /* ldapsync context */
 144         int             *si_sids;
 145         int             si_numcsns;
 146         int             si_chkops;      /* checkpointing info */
 147         int             si_chktime;
 148         int             si_numops;      /* number of ops since last checkpoint */
 149         int             si_nopres;      /* Skip present phase */
 150         int             si_usehint;     /* use reload hint */
 151         int             si_active;      /* True if there are active mods */
 152         int             si_dirty;       /* True if the context is dirty, i.e changes
 153                                                  * have been made without updating the csn. */
 154         time_t  si_chklast;     /* time of last checkpoint */
 155         Avlnode *si_mods;       /* entries being modified */
 156         sessionlog      *si_logs;
 157         ldap_pvt_thread_rdwr_t  si_csn_rwlock;
 158         ldap_pvt_thread_mutex_t si_ops_mutex;
 159         ldap_pvt_thread_mutex_t si_mods_mutex;
 160         ldap_pvt_thread_mutex_t si_resp_mutex;
 161 } syncprov_info_t;
 162
 163 typedef struct opcookie {
 164         slap_overinst *son;
 165         syncmatches *smatches;
 166         modtarget *smt;
 167         Entry *se;
 168         struct berval sdn;      /* DN of entry, for deletes */
 169         struct berval sndn;
 170         struct berval suuid;    /* UUID of entry */
 171         struct berval sctxcsn;
 172         short osid;     /* sid of op csn */
 173         short rsid;     /* sid of relay */
 174         short sreference;       /* Is the entry a reference? */
 175         syncres ssres;
 176 } opcookie;
 177
 178 typedef struct fbase_cookie {
 179         struct berval *fdn;     /* DN of a modified entry, for scope testing */
 180         syncops *fss;   /* persistent search we're testing against */
 181         int fbase;      /* if TRUE we found the search base and it's still valid */
 182         int fscope;     /* if TRUE then fdn is within the psearch scope */
 183 } fbase_cookie;
 184
 185 static AttributeName csn_anlist[3];
 186 static AttributeName uuid_anlist[2];
 187
 188 /* Build a LDAPsync intermediate state control */
 189 static int
 190 syncprov_state_ctrl(
 191         Operation       *op,
 192         SlapReply       *rs,
 193         Entry           *e,
 194         int             entry_sync_state,
 195         LDAPControl     **ctrls,
 196         int             num_ctrls,
 197         int             send_cookie,
 198         struct berval   *cookie )
 199 {
 200         Attribute* a;
 201         int ret;
 202
 203         BerElementBuffer berbuf;
 204         BerElement *ber = (BerElement *)&berbuf;
 205         LDAPControl *cp;
 206         struct berval bv;
 207         struct berval   entryuuid_bv = BER_BVNULL;
 208
 209         ber_init2( ber, 0, LBER_USE_DER );
 210         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 211
 212         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 213                 AttributeDescription *desc = a->a_desc;
 214                 if ( desc == slap_schema.si_ad_entryUUID ) {
 215                         entryuuid_bv = a->a_nvals[0];
 216                         break;
 217                 }
 218         }
 219
 220         /* FIXME: what if entryuuid is NULL or empty ? */
 221
 222         if ( send_cookie && cookie ) {
 223                 ber_printf( ber, "{eOON}",
 224                         entry_sync_state, &entryuuid_bv, cookie );
 225         } else {
 226                 ber_printf( ber, "{eON}",
 227                         entry_sync_state, &entryuuid_bv );
 228         }
 229
 230         ret = ber_flatten2( ber, &bv, 0 );
 231         if ( ret == 0 ) {
 232                 cp = op->o_tmpalloc( sizeof( LDAPControl ) + bv.bv_len, op->o_tmpmemctx );
 233                 cp->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 234                 cp->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 235                 cp->ldctl_value.bv_val = (char *)&cp[1];
 236                 cp->ldctl_value.bv_len = bv.bv_len;
 237                 AC_MEMCPY( cp->ldctl_value.bv_val, bv.bv_val, bv.bv_len );
 238                 ctrls[num_ctrls] = cp;
 239         }
 240         ber_free_buf( ber );
 241
 242         if ( ret < 0 ) {
 243                 Debug( LDAP_DEBUG_TRACE,
 244                         "slap_build_sync_ctrl: ber_flatten2 failed (%d)\n",
 245                         ret, 0, 0 );
 246                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 247                 return LDAP_OTHER;
 248         }
 249
 250         return LDAP_SUCCESS;
 251 }
 252
 253 /* Build a LDAPsync final state control */
 254 static int
 255 syncprov_done_ctrl(
 256         Operation       *op,
 257         SlapReply       *rs,
 258         LDAPControl     **ctrls,
 259         int                     num_ctrls,
 260         int                     send_cookie,
 261         struct berval *cookie,
 262         int                     refreshDeletes )
 263 {
 264         int ret;
 265         BerElementBuffer berbuf;
 266         BerElement *ber = (BerElement *)&berbuf;
 267         LDAPControl *cp;
 268         struct berval bv;
 269
 270         ber_init2( ber, NULL, LBER_USE_DER );
 271         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 272
 273         ber_printf( ber, "{" );
 274         if ( send_cookie && cookie ) {
 275                 ber_printf( ber, "O", cookie );
 276         }
 277         if ( refreshDeletes == LDAP_SYNC_REFRESH_DELETES ) {
 278                 ber_printf( ber, "b", refreshDeletes );
 279         }
 280         ber_printf( ber, "N}" );
 281
 282         ret = ber_flatten2( ber, &bv, 0 );
 283         if ( ret == 0 ) {
 284                 cp = op->o_tmpalloc( sizeof( LDAPControl ) + bv.bv_len, op->o_tmpmemctx );
 285                 cp->ldctl_oid = LDAP_CONTROL_SYNC_DONE;
 286                 cp->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 287                 cp->ldctl_value.bv_val = (char *)&cp[1];
 288                 cp->ldctl_value.bv_len = bv.bv_len;
 289                 AC_MEMCPY( cp->ldctl_value.bv_val, bv.bv_val, bv.bv_len );
 290                 ctrls[num_ctrls] = cp;
 291         }
 292
 293         ber_free_buf( ber );
 294
 295         if ( ret < 0 ) {
 296                 Debug( LDAP_DEBUG_TRACE,
 297                         "syncprov_done_ctrl: ber_flatten2 failed (%d)\n",
 298                         ret, 0, 0 );
 299                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 300                 return LDAP_OTHER;
 301         }
 302
 303         return LDAP_SUCCESS;
 304 }
 305
 306 static int
 307 syncprov_sendinfo(
 308         Operation       *op,
 309         SlapReply       *rs,
 310         int                     type,
 311         struct berval *cookie,
 312         int                     refreshDone,
 313         BerVarray       syncUUIDs,
 314         int                     refreshDeletes )
 315 {
 316         BerElementBuffer berbuf;
 317         BerElement *ber = (BerElement *)&berbuf;
 318         struct berval rspdata;
 319
 320         int ret;
 321
 322         ber_init2( ber, NULL, LBER_USE_DER );
 323         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 324
 325         if ( type ) {
 326                 switch ( type ) {
 327                 case LDAP_TAG_SYNC_NEW_COOKIE:
 328                         ber_printf( ber, "tO", type, cookie );
 329                         break;
 330                 case LDAP_TAG_SYNC_REFRESH_DELETE:
 331                 case LDAP_TAG_SYNC_REFRESH_PRESENT:
 332                         ber_printf( ber, "t{", type );
 333                         if ( cookie ) {
 334                                 ber_printf( ber, "O", cookie );
 335                         }
 336                         if ( refreshDone == 0 ) {
 337                                 ber_printf( ber, "b", refreshDone );
 338                         }
 339                         ber_printf( ber, "N}" );
 340                         break;
 341                 case LDAP_TAG_SYNC_ID_SET:
 342                         ber_printf( ber, "t{", type );
 343                         if ( cookie ) {
 344                                 ber_printf( ber, "O", cookie );
 345                         }
 346                         if ( refreshDeletes == 1 ) {
 347                                 ber_printf( ber, "b", refreshDeletes );
 348                         }
 349                         ber_printf( ber, "[W]", syncUUIDs );
 350                         ber_printf( ber, "N}" );
 351                         break;
 352                 default:
 353                         Debug( LDAP_DEBUG_TRACE,
 354                                 "syncprov_sendinfo: invalid syncinfo type (%d)\n",
 355                                 type, 0, 0 );
 356                         return LDAP_OTHER;
 357                 }
 358         }
 359
 360         ret = ber_flatten2( ber, &rspdata, 0 );
 361
 362         if ( ret < 0 ) {
 363                 Debug( LDAP_DEBUG_TRACE,
 364                         "syncprov_sendinfo: ber_flatten2 failed (%d)\n",
 365                         ret, 0, 0 );
 366                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 367                 return LDAP_OTHER;
 368         }
 369
 370         rs->sr_rspoid = LDAP_SYNC_INFO;
 371         rs->sr_rspdata = &rspdata;
 372         send_ldap_intermediate( op, rs );
 373         rs->sr_rspdata = NULL;
 374         ber_free_buf( ber );
 375
 376         return LDAP_SUCCESS;
 377 }
 378
 379 /* Find a modtarget in an AVL tree */
 380 static int
 381 sp_avl_cmp( const void *c1, const void *c2 )
 382 {
 383         const modtarget *m1, *m2;
 384         int rc;
 385
 386         m1 = c1; m2 = c2;
 387         rc = m1->mt_dn.bv_len - m2->mt_dn.bv_len;
 388
 389         if ( rc ) return rc;
 390         return ber_bvcmp( &m1->mt_dn, &m2->mt_dn );
 391 }
 392
 393 /* syncprov_findbase:
 394  *   finds the true DN of the base of a search (with alias dereferencing) and
 395  * checks to make sure the base entry doesn't get replaced with a different
 396  * entry (e.g., swapping trees via ModDN, or retargeting an alias). If a
 397  * change is detected, any persistent search on this base must be terminated /
 398  * reloaded.
 399  *   On the first call, we just save the DN and entryID. On subsequent calls
 400  * we compare the DN and entryID with the saved values.
 401  */
 402 static int
 403 findbase_cb( Operation *op, SlapReply *rs )
 404 {
 405         slap_callback *sc = op->o_callback;
 406
 407         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 408                 fbase_cookie *fc = sc->sc_private;
 409
 410                 /* If no entryID, we're looking for the first time.
 411                  * Just store whatever we got.
 412                  */
 413                 if ( fc->fss->s_eid == NOID ) {
 414                         fc->fbase = 2;
 415                         fc->fss->s_eid = rs->sr_entry->e_id;
 416                         ber_dupbv( &fc->fss->s_base, &rs->sr_entry->e_nname );
 417
 418                 } else if ( rs->sr_entry->e_id == fc->fss->s_eid &&
 419                         dn_match( &rs->sr_entry->e_nname, &fc->fss->s_base )) {
 420
 421                 /* OK, the DN is the same and the entryID is the same. */
 422                         fc->fbase = 1;
 423                 }
 424         }
 425         if ( rs->sr_err != LDAP_SUCCESS ) {
 426                 Debug( LDAP_DEBUG_ANY, "findbase failed! %d\n", rs->sr_err,0,0 );
 427         }
 428         return LDAP_SUCCESS;
 429 }
 430
 431 static Filter generic_filter = { LDAP_FILTER_PRESENT, { 0 }, NULL };
 432 static struct berval generic_filterstr = BER_BVC("(objectclass=*)");
 433
 434 static int
 435 syncprov_findbase( Operation *op, fbase_cookie *fc )
 436 {
 437         /* Use basic parameters from syncrepl search, but use
 438          * current op's threadctx / tmpmemctx
 439          */
 440         ldap_pvt_thread_mutex_lock( &fc->fss->s_mutex );
 441         if ( fc->fss->s_flags & PS_FIND_BASE ) {
 442                 slap_callback cb = {0};
 443                 Operation fop;
 444                 SlapReply frs = { REP_RESULT };
 445                 int rc;
 446
 447                 fc->fss->s_flags ^= PS_FIND_BASE;
 448                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 449
 450                 fop = *fc->fss->s_op;
 451
 452                 fop.o_bd = fop.o_bd->bd_self;
 453                 fop.o_hdr = op->o_hdr;
 454                 fop.o_time = op->o_time;
 455                 fop.o_tincr = op->o_tincr;
 456                 fop.o_extra = op->o_extra;
 457
 458                 cb.sc_response = findbase_cb;
 459                 cb.sc_private = fc;
 460
 461                 fop.o_sync_mode = 0;    /* turn off sync mode */
 462                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 463                 fop.o_callback = &cb;
 464                 fop.o_tag = LDAP_REQ_SEARCH;
 465                 fop.ors_scope = LDAP_SCOPE_BASE;
 466                 fop.ors_limit = NULL;
 467                 fop.ors_slimit = 1;
 468                 fop.ors_tlimit = SLAP_NO_LIMIT;
 469                 fop.ors_attrs = slap_anlist_no_attrs;
 470                 fop.ors_attrsonly = 1;
 471                 fop.ors_filter = &generic_filter;
 472                 fop.ors_filterstr = generic_filterstr;
 473
 474                 rc = fop.o_bd->be_search( &fop, &frs );
 475         } else {
 476                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 477                 fc->fbase = 1;
 478         }
 479
 480         /* After the first call, see if the fdn resides in the scope */
 481         if ( fc->fbase == 1 ) {
 482                 switch ( fc->fss->s_op->ors_scope ) {
 483                 case LDAP_SCOPE_BASE:
 484                         fc->fscope = dn_match( fc->fdn, &fc->fss->s_base );
 485                         break;
 486                 case LDAP_SCOPE_ONELEVEL: {
 487                         struct berval pdn;
 488                         dnParent( fc->fdn, &pdn );
 489                         fc->fscope = dn_match( &pdn, &fc->fss->s_base );
 490                         break; }
 491                 case LDAP_SCOPE_SUBTREE:
 492                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base );
 493                         break;
 494                 case LDAP_SCOPE_SUBORDINATE:
 495                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base ) &&
 496                                 !dn_match( fc->fdn, &fc->fss->s_base );
 497                         break;
 498                 }
 499         }
 500
 501         if ( fc->fbase )
 502                 return LDAP_SUCCESS;
 503
 504         /* If entryID has changed, then the base of this search has
 505          * changed. Invalidate the psearch.
 506          */
 507         return LDAP_NO_SUCH_OBJECT;
 508 }
 509
 510 /* syncprov_findcsn:
 511  *   This function has three different purposes, but they all use a search
 512  * that filters on entryCSN so they're combined here.
 513  * 1: at startup time, after a contextCSN has been read from the database,
 514  * we search for all entries with CSN >= contextCSN in case the contextCSN
 515  * was not checkpointed at the previous shutdown.
 516  *
 517  * 2: when the current contextCSN is known and we have a sync cookie, we search
 518  * for one entry with CSN = the cookie CSN. If not found, try <= cookie CSN.
 519  * If an entry is found, the cookie CSN is valid, otherwise it is stale.
 520  *
 521  * 3: during a refresh phase, we search for all entries with CSN <= the cookie
 522  * CSN, and generate Present records for them. We always collect this result
 523  * in SyncID sets, even if there's only one match.
 524  */
 525 typedef enum find_csn_t {
 526         FIND_MAXCSN     = 1,
 527         FIND_CSN        = 2,
 528         FIND_PRESENT    = 3
 529 } find_csn_t;
 530
 531 static int
 532 findmax_cb( Operation *op, SlapReply *rs )
 533 {
 534         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 535                 struct berval *maxcsn = op->o_callback->sc_private;
 536                 Attribute *a = attr_find( rs->sr_entry->e_attrs,
 537                         slap_schema.si_ad_entryCSN );
 538
 539                 if ( a && ber_bvcmp( &a->a_vals[0], maxcsn ) > 0 &&
 540                         slap_parse_csn_sid( &a->a_vals[0] ) == slap_serverID ) {
 541                         maxcsn->bv_len = a->a_vals[0].bv_len;
 542                         strcpy( maxcsn->bv_val, a->a_vals[0].bv_val );
 543                 }
 544         }
 545         return LDAP_SUCCESS;
 546 }
 547
 548 static int
 549 findcsn_cb( Operation *op, SlapReply *rs )
 550 {
 551         slap_callback *sc = op->o_callback;
 552
 553         /* We just want to know that at least one exists, so it's OK if
 554          * we exceed the unchecked limit.
 555          */
 556         if ( rs->sr_err == LDAP_ADMINLIMIT_EXCEEDED ||
 557                 (rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS )) {
 558                 sc->sc_private = (void *)1;
 559         }
 560         return LDAP_SUCCESS;
 561 }
 562
 563 /* Build a list of entryUUIDs for sending in a SyncID set */
 564
 565 #define UUID_LEN        16
 566
 567 typedef struct fpres_cookie {
 568         int num;
 569         BerVarray uuids;
 570         char *last;
 571 } fpres_cookie;
 572
 573 static int
 574 findpres_cb( Operation *op, SlapReply *rs )
 575 {
 576         slap_callback *sc = op->o_callback;
 577         fpres_cookie *pc = sc->sc_private;
 578         Attribute *a;
 579         int ret = SLAP_CB_CONTINUE;
 580
 581         switch ( rs->sr_type ) {
 582         case REP_SEARCH:
 583                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryUUID );
 584                 if ( a ) {
 585                         pc->uuids[pc->num].bv_val = pc->last;
 586                         AC_MEMCPY( pc->uuids[pc->num].bv_val, a->a_nvals[0].bv_val,
 587                                 pc->uuids[pc->num].bv_len );
 588                         pc->num++;
 589                         pc->last = pc->uuids[pc->num].bv_val;
 590                         pc->uuids[pc->num].bv_val = NULL;
 591                 }
 592                 ret = LDAP_SUCCESS;
 593                 if ( pc->num != SLAP_SYNCUUID_SET_SIZE )
 594                         break;
 595                 /* FALLTHRU */
 596         case REP_RESULT:
 597                 ret = rs->sr_err;
 598                 if ( pc->num ) {
 599                         ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 600                                 0, pc->uuids, 0 );
 601                         pc->uuids[pc->num].bv_val = pc->last;
 602                         pc->num = 0;
 603                         pc->last = pc->uuids[0].bv_val;
 604                 }
 605                 break;
 606         default:
 607                 break;
 608         }
 609         return ret;
 610 }
 611
 612 static int
 613 syncprov_findcsn( Operation *op, find_csn_t mode, struct berval *csn )
 614 {
 615         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 616         syncprov_info_t         *si = on->on_bi.bi_private;
 617
 618         slap_callback cb = {0};
 619         Operation fop;
 620         SlapReply frs = { REP_RESULT };
 621         char buf[LDAP_PVT_CSNSTR_BUFSIZE + STRLENOF("(entryCSN<=)")];
 622         char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
 623         struct berval maxcsn;
 624         Filter cf;
 625         AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
 626         fpres_cookie pcookie;
 627         sync_control *srs = NULL;
 628         struct slap_limits_set fc_limits;
 629         int i, rc = LDAP_SUCCESS, findcsn_retry = 1;
 630         int maxid;
 631
 632         if ( mode != FIND_MAXCSN ) {
 633                 srs = op->o_controls[slap_cids.sc_LDAPsync];
 634         }
 635
 636         fop = *op;
 637         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync_mode */
 638         /* We want pure entries, not referrals */
 639         fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 640
 641         cf.f_ava = &eq;
 642         cf.f_av_desc = slap_schema.si_ad_entryCSN;
 643         BER_BVZERO( &cf.f_av_value );
 644         cf.f_next = NULL;
 645
 646         fop.o_callback = &cb;
 647         fop.ors_limit = NULL;
 648         fop.ors_tlimit = SLAP_NO_LIMIT;
 649         fop.ors_filter = &cf;
 650         fop.ors_filterstr.bv_val = buf;
 651
 652 again:
 653         switch( mode ) {
 654         case FIND_MAXCSN:
 655                 cf.f_choice = LDAP_FILTER_GE;
 656                 /* If there are multiple CSNs, use the one with our serverID */
 657                 for ( i=0; i<si->si_numcsns; i++) {
 658                         if ( slap_serverID == si->si_sids[i] ) {
 659                                 maxid = i;
 660                                 break;
 661                         }
 662                 }
 663                 if ( i == si->si_numcsns ) {
 664                         /* No match: this is multimaster, and none of the content in the DB
 665                          * originated locally. Treat like no CSN.
 666                          */
 667                         return LDAP_NO_SUCH_OBJECT;
 668                 }
 669                 cf.f_av_value = si->si_ctxcsn[maxid];
 670                 fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 671                         "(entryCSN>=%s)", cf.f_av_value.bv_val );
 672                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 673                         return LDAP_OTHER;
 674                 }
 675                 fop.ors_attrsonly = 0;
 676                 fop.ors_attrs = csn_anlist;
 677                 fop.ors_slimit = SLAP_NO_LIMIT;
 678                 cb.sc_private = &maxcsn;
 679                 cb.sc_response = findmax_cb;
 680                 strcpy( cbuf, cf.f_av_value.bv_val );
 681                 maxcsn.bv_val = cbuf;
 682                 maxcsn.bv_len = cf.f_av_value.bv_len;
 683                 break;
 684         case FIND_CSN:
 685                 if ( BER_BVISEMPTY( &cf.f_av_value )) {
 686                         cf.f_av_value = *csn;
 687                 }
 688                 fop.o_dn = op->o_bd->be_rootdn;
 689                 fop.o_ndn = op->o_bd->be_rootndn;
 690                 fop.o_req_dn = op->o_bd->be_suffix[0];
 691                 fop.o_req_ndn = op->o_bd->be_nsuffix[0];
 692                 /* Look for exact match the first time */
 693                 if ( findcsn_retry ) {
 694                         cf.f_choice = LDAP_FILTER_EQUALITY;
 695                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 696                                 "(entryCSN=%s)", cf.f_av_value.bv_val );
 697                 /* On retry, look for <= */
 698                 } else {
 699                         cf.f_choice = LDAP_FILTER_LE;
 700                         fop.ors_limit = &fc_limits;
 701                         memset( &fc_limits, 0, sizeof( fc_limits ));
 702                         fc_limits.lms_s_unchecked = 1;
 703                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 704                                 "(entryCSN<=%s)", cf.f_av_value.bv_val );
 705                 }
 706                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 707                         return LDAP_OTHER;
 708                 }
 709                 fop.ors_attrsonly = 1;
 710                 fop.ors_attrs = slap_anlist_no_attrs;
 711                 fop.ors_slimit = 1;
 712                 cb.sc_private = NULL;
 713                 cb.sc_response = findcsn_cb;
 714                 break;
 715         case FIND_PRESENT:
 716                 fop.ors_filter = op->ors_filter;
 717                 fop.ors_filterstr = op->ors_filterstr;
 718                 fop.ors_attrsonly = 0;
 719                 fop.ors_attrs = uuid_anlist;
 720                 fop.ors_slimit = SLAP_NO_LIMIT;
 721                 cb.sc_private = &pcookie;
 722                 cb.sc_response = findpres_cb;
 723                 pcookie.num = 0;
 724
 725                 /* preallocate storage for a full set */
 726                 pcookie.uuids = op->o_tmpalloc( (SLAP_SYNCUUID_SET_SIZE+1) *
 727                         sizeof(struct berval) + SLAP_SYNCUUID_SET_SIZE * UUID_LEN,
 728                         op->o_tmpmemctx );
 729                 pcookie.last = (char *)(pcookie.uuids + SLAP_SYNCUUID_SET_SIZE+1);
 730                 pcookie.uuids[0].bv_val = pcookie.last;
 731                 pcookie.uuids[0].bv_len = UUID_LEN;
 732                 for (i=1; i<SLAP_SYNCUUID_SET_SIZE; i++) {
 733                         pcookie.uuids[i].bv_val = pcookie.uuids[i-1].bv_val + UUID_LEN;
 734                         pcookie.uuids[i].bv_len = UUID_LEN;
 735                 }
 736                 break;
 737         }
 738
 739         fop.o_bd->bd_info = (BackendInfo *)on->on_info;
 740         fop.o_bd->be_search( &fop, &frs );
 741         fop.o_bd->bd_info = (BackendInfo *)on;
 742
 743         switch( mode ) {
 744         case FIND_MAXCSN:
 745                 if ( ber_bvcmp( &si->si_ctxcsn[maxid], &maxcsn )) {
 746 #ifdef CHECK_CSN
 747                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
 748                         assert( !syn->ssyn_validate( syn, &maxcsn ));
 749 #endif
 750                         ber_bvreplace( &si->si_ctxcsn[maxid], &maxcsn );
 751                         si->si_numops++;        /* ensure a checkpoint */
 752                 }
 753                 break;
 754         case FIND_CSN:
 755                 /* If matching CSN was not found, invalidate the context. */
 756                 if ( !cb.sc_private ) {
 757                         /* If we didn't find an exact match, then try for <= */
 758                         if ( findcsn_retry ) {
 759                                 findcsn_retry = 0;
 760                                 rs_reinit( &frs, REP_RESULT );
 761                                 goto again;
 762                         }
 763                         rc = LDAP_NO_SUCH_OBJECT;
 764                 }
 765                 break;
 766         case FIND_PRESENT:
 767                 op->o_tmpfree( pcookie.uuids, op->o_tmpmemctx );
 768                 break;
 769         }
 770
 771         return rc;
 772 }
 773
 774 static void free_resinfo( syncres *sr )
 775 {
 776         syncres **st;
 777         int freeit = 0;
 778         ldap_pvt_thread_mutex_lock( &sr->s_info->ri_mutex );
 779         for (st = &sr->s_info->ri_list; *st; st = &(*st)->s_rilist) {
 780                 if (*st == sr) {
 781                         *st = sr->s_rilist;
 782                         break;
 783                 }
 784         }
 785         if ( !sr->s_info->ri_list )
 786                 freeit = 1;
 787         ldap_pvt_thread_mutex_unlock( &sr->s_info->ri_mutex );
 788         if ( freeit ) {
 789                 ldap_pvt_thread_mutex_destroy( &sr->s_info->ri_mutex );
 790                 if ( sr->s_info->ri_e )
 791                         entry_free( sr->s_info->ri_e );
 792                 if ( !BER_BVISNULL( &sr->s_info->ri_cookie ))
 793                         ch_free( sr->s_info->ri_cookie.bv_val );
 794                 ch_free( sr->s_info );
 795         }
 796 }
 797
 798 static int
 799 syncprov_free_syncop( syncops *so, int unlink )
 800 {
 801         syncres *sr, *srnext;
 802         GroupAssertion *ga, *gnext;
 803
 804         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 805         /* already being freed, or still in use */
 806         if ( !so->s_inuse || --so->s_inuse > 0 ) {
 807                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 808                 return 0;
 809         }
 810         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 811         if ( unlink ) {
 812                 syncops **sop;
 813                 ldap_pvt_thread_mutex_lock( &so->s_si->si_ops_mutex );
 814                 for ( sop = &so->s_si->si_ops; *sop; sop = &(*sop)->s_next ) {
 815                         if ( *sop == so ) {
 816                                 *sop = so->s_next;
 817                                 break;
 818                         }
 819                 }
 820                 ldap_pvt_thread_mutex_unlock( &so->s_si->si_ops_mutex );
 821         }
 822         if ( so->s_flags & PS_IS_DETACHED ) {
 823                 filter_free( so->s_op->ors_filter );
 824                 for ( ga = so->s_op->o_groups; ga; ga=gnext ) {
 825                         gnext = ga->ga_next;
 826                         ch_free( ga );
 827                 }
 828                 ch_free( so->s_op );
 829         }
 830         ch_free( so->s_base.bv_val );
 831         for ( sr=so->s_res; sr; sr=srnext ) {
 832                 srnext = sr->s_next;
 833                 free_resinfo( sr );
 834                 ch_free( sr );
 835         }
 836         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 837         ch_free( so );
 838         return 1;
 839 }
 840
 841 /* Send a persistent search response */
 842 static int
 843 syncprov_sendresp( Operation *op, resinfo *ri, syncops *so, int mode )
 844 {
 845         SlapReply rs = { REP_SEARCH };
 846         struct berval cookie, csns[2];
 847         Entry e_uuid = {0};
 848         Attribute a_uuid = {0};
 849
 850         if ( so->s_op->o_abandon )
 851                 return SLAPD_ABANDON;
 852
 853         rs.sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2, op->o_tmpmemctx );
 854         rs.sr_ctrls[1] = NULL;
 855         rs.sr_flags = REP_CTRLS_MUSTBEFREED;
 856         csns[0] = ri->ri_csn;
 857         BER_BVZERO( &csns[1] );
 858         slap_compose_sync_cookie( op, &cookie, csns, so->s_rid, slap_serverID ? slap_serverID : -1 );
 859
 860 #ifdef LDAP_DEBUG
 861         if ( so->s_sid > 0 ) {
 862                 Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: to=%03x, cookie=%s\n",
 863                         so->s_sid, cookie.bv_val, 0 );
 864         } else {
 865                 Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: cookie=%s\n",
 866                         cookie.bv_val, 0, 0 );
 867         }
 868 #endif
 869
 870         e_uuid.e_attrs = &a_uuid;
 871         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 872         a_uuid.a_nvals = &ri->ri_uuid;
 873         rs.sr_err = syncprov_state_ctrl( op, &rs, &e_uuid,
 874                 mode, rs.sr_ctrls, 0, 1, &cookie );
 875         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
 876
 877         rs.sr_entry = &e_uuid;
 878         if ( mode == LDAP_SYNC_ADD || mode == LDAP_SYNC_MODIFY ) {
 879                 e_uuid = *ri->ri_e;
 880                 e_uuid.e_private = NULL;
 881         }
 882
 883         switch( mode ) {
 884         case LDAP_SYNC_ADD:
 885                 if ( ri->ri_isref && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 886                         rs.sr_ref = get_entry_referrals( op, rs.sr_entry );
 887                         rs.sr_err = send_search_reference( op, &rs );
 888                         ber_bvarray_free( rs.sr_ref );
 889                         break;
 890                 }
 891                 /* fallthru */
 892         case LDAP_SYNC_MODIFY:
 893                 rs.sr_attrs = op->ors_attrs;
 894                 rs.sr_err = send_search_entry( op, &rs );
 895                 break;
 896         case LDAP_SYNC_DELETE:
 897                 e_uuid.e_attrs = NULL;
 898                 e_uuid.e_name = ri->ri_dn;
 899                 e_uuid.e_nname = ri->ri_ndn;
 900                 if ( ri->ri_isref && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 901                         struct berval bv = BER_BVNULL;
 902                         rs.sr_ref = &bv;
 903                         rs.sr_err = send_search_reference( op, &rs );
 904                 } else {
 905                         rs.sr_err = send_search_entry( op, &rs );
 906                 }
 907                 break;
 908         default:
 909                 assert(0);
 910         }
 911         return rs.sr_err;
 912 }
 913
 914 static void
 915 syncprov_qstart( syncops *so );
 916
 917 /* Play back queued responses */
 918 static int
 919 syncprov_qplay( Operation *op, syncops *so )
 920 {
 921         syncres *sr;
 922         int rc = 0;
 923
 924         do {
 925                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 926                 sr = so->s_res;
 927                 /* Exit loop with mutex held */
 928                 if ( !sr )
 929                         break;
 930                 so->s_res = sr->s_next;
 931                 if ( !so->s_res )
 932                         so->s_restail = NULL;
 933                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 934
 935                 if ( !so->s_op->o_abandon ) {
 936
 937                         if ( sr->s_mode == LDAP_SYNC_NEW_COOKIE ) {
 938                                 SlapReply rs = { REP_INTERMEDIATE };
 939
 940                                 rc = syncprov_sendinfo( op, &rs, LDAP_TAG_SYNC_NEW_COOKIE,
 941                                         &sr->s_info->ri_cookie, 0, NULL, 0 );
 942                         } else {
 943                                 rc = syncprov_sendresp( op, sr->s_info, so, sr->s_mode );
 944                         }
 945                 }
 946
 947                 free_resinfo( sr );
 948                 ch_free( sr );
 949
 950                 if ( so->s_op->o_abandon )
 951                         continue;
 952
 953                 /* Exit loop with mutex held */
 954                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 955                 break;
 956
 957         } while (1);
 958
 959         /* We now only send one change at a time, to prevent one
 960          * psearch from hogging all the CPU. Resubmit this task if
 961          * there are more responses queued and no errors occurred.
 962          */
 963
 964         if ( rc == 0 && so->s_res ) {
 965                 syncprov_qstart( so );
 966         } else {
 967                 so->s_flags ^= PS_TASK_QUEUED;
 968         }
 969
 970         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 971         return rc;
 972 }
 973
 974 /* task for playing back queued responses */
 975 static void *
 976 syncprov_qtask( void *ctx, void *arg )
 977 {
 978         syncops *so = arg;
 979         OperationBuffer opbuf;
 980         Operation *op;
 981         BackendDB be;
 982         int rc;
 983
 984         op = &opbuf.ob_op;
 985         *op = *so->s_op;
 986         op->o_hdr = &opbuf.ob_hdr;
 987         op->o_controls = opbuf.ob_controls;
 988         memset( op->o_controls, 0, sizeof(opbuf.ob_controls) );
 989         op->o_sync = SLAP_CONTROL_IGNORED;
 990
 991         *op->o_hdr = *so->s_op->o_hdr;
 992
 993         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx, 1);
 994         op->o_tmpmfuncs = &slap_sl_mfuncs;
 995         op->o_threadctx = ctx;
 996
 997         /* syncprov_qplay expects a fake db */
 998         be = *so->s_op->o_bd;
 999         be.be_flags |= SLAP_DBFLAG_OVERLAY;
1000         op->o_bd = &be;
1001         LDAP_SLIST_FIRST(&op->o_extra) = NULL;
1002         op->o_callback = NULL;
1003
1004         rc = syncprov_qplay( op, so );
1005
1006         /* decrement use count... */
1007         syncprov_free_syncop( so, 1 );
1008
1009         return NULL;
1010 }
1011
1012 /* Start the task to play back queued psearch responses */
1013 static void
1014 syncprov_qstart( syncops *so )
1015 {
1016         so->s_flags |= PS_TASK_QUEUED;
1017         so->s_inuse++;
1018         ldap_pvt_thread_pool_submit( &connection_pool,
1019                 syncprov_qtask, so );
1020 }
1021
1022 /* Queue a persistent search response */
1023 static int
1024 syncprov_qresp( opcookie *opc, syncops *so, int mode )
1025 {
1026         syncres *sr;
1027         resinfo *ri;
1028         int srsize;
1029         struct berval csn = opc->sctxcsn;
1030
1031         sr = ch_malloc( sizeof( syncres ));
1032         sr->s_next = NULL;
1033         sr->s_mode = mode;
1034         if ( !opc->ssres.s_info ) {
1035
1036                 srsize = sizeof( resinfo );
1037                 if ( csn.bv_len )
1038                         srsize += csn.bv_len + 1;
1039
1040                 if ( opc->se ) {
1041                         Attribute *a;
1042                         ri = ch_malloc( srsize );
1043                         ri->ri_dn = opc->se->e_name;
1044                         ri->ri_ndn = opc->se->e_nname;
1045                         a = attr_find( opc->se->e_attrs, slap_schema.si_ad_entryUUID );
1046                         if ( a )
1047                                 ri->ri_uuid = a->a_nvals[0];
1048                         else
1049                                 ri->ri_uuid.bv_len = 0;
1050                         if ( csn.bv_len ) {
1051                                 ri->ri_csn.bv_val = (char *)(ri + 1);
1052                                 ri->ri_csn.bv_len = csn.bv_len;
1053                                 memcpy( ri->ri_csn.bv_val, csn.bv_val, csn.bv_len );
1054                                 ri->ri_csn.bv_val[csn.bv_len] = '\0';
1055                         } else {
1056                                 ri->ri_csn.bv_val = NULL;
1057                         }
1058                 } else {
1059                         srsize += opc->suuid.bv_len +
1060                                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1;
1061                         ri = ch_malloc( srsize );
1062                         ri->ri_dn.bv_val = (char *)(ri + 1);
1063                         ri->ri_dn.bv_len = opc->sdn.bv_len;
1064                         ri->ri_ndn.bv_val = lutil_strcopy( ri->ri_dn.bv_val,
1065                                 opc->sdn.bv_val ) + 1;
1066                         ri->ri_ndn.bv_len = opc->sndn.bv_len;
1067                         ri->ri_uuid.bv_val = lutil_strcopy( ri->ri_ndn.bv_val,
1068                                 opc->sndn.bv_val ) + 1;
1069                         ri->ri_uuid.bv_len = opc->suuid.bv_len;
1070                         AC_MEMCPY( ri->ri_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1071                         if ( csn.bv_len ) {
1072                                 ri->ri_csn.bv_val = ri->ri_uuid.bv_val + ri->ri_uuid.bv_len;
1073                                 memcpy( ri->ri_csn.bv_val, csn.bv_val, csn.bv_len );
1074                                 ri->ri_csn.bv_val[csn.bv_len] = '\0';
1075                         } else {
1076                                 ri->ri_csn.bv_val = NULL;
1077                         }
1078                 }
1079                 ri->ri_list = &opc->ssres;
1080                 ri->ri_e = opc->se;
1081                 ri->ri_csn.bv_len = csn.bv_len;
1082                 ri->ri_isref = opc->sreference;
1083                 BER_BVZERO( &ri->ri_cookie );
1084                 ldap_pvt_thread_mutex_init( &ri->ri_mutex );
1085                 opc->se = NULL;
1086                 opc->ssres.s_info = ri;
1087         }
1088         ri = opc->ssres.s_info;
1089         sr->s_info = ri;
1090         ldap_pvt_thread_mutex_lock( &ri->ri_mutex );
1091         sr->s_rilist = ri->ri_list;
1092         ri->ri_list = sr;
1093         if ( mode == LDAP_SYNC_NEW_COOKIE && BER_BVISNULL( &ri->ri_cookie )) {
1094                 syncprov_info_t *si = opc->son->on_bi.bi_private;
1095
1096                 slap_compose_sync_cookie( NULL, &ri->ri_cookie, si->si_ctxcsn,
1097                         so->s_rid, slap_serverID ? slap_serverID : -1);
1098         }
1099         ldap_pvt_thread_mutex_unlock( &ri->ri_mutex );
1100
1101         ldap_pvt_thread_mutex_lock( &so->s_mutex );
1102         if ( !so->s_res ) {
1103                 so->s_res = sr;
1104         } else {
1105                 so->s_restail->s_next = sr;
1106         }
1107         so->s_restail = sr;
1108
1109         /* If the base of the psearch was modified, check it next time round */
1110         if ( so->s_flags & PS_WROTE_BASE ) {
1111                 so->s_flags ^= PS_WROTE_BASE;
1112                 so->s_flags |= PS_FIND_BASE;
1113         }
1114         if (( so->s_flags & (PS_IS_DETACHED|PS_TASK_QUEUED)) == PS_IS_DETACHED ) {
1115                 syncprov_qstart( so );
1116         }
1117         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
1118         return LDAP_SUCCESS;
1119 }
1120
1121 static int
1122 syncprov_drop_psearch( syncops *so, int lock )
1123 {
1124         if ( so->s_flags & PS_IS_DETACHED ) {
1125                 if ( lock )
1126                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
1127                 so->s_op->o_conn->c_n_ops_executing--;
1128                 so->s_op->o_conn->c_n_ops_completed++;
1129                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, Operation,
1130                         o_next );
1131                 if ( lock )
1132                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
1133         }
1134         return syncprov_free_syncop( so, 0 );
1135 }
1136
1137 static int
1138 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
1139 {
1140         slap_callback *sc = op->o_callback;
1141         op->o_callback = sc->sc_next;
1142         syncprov_drop_psearch( sc->sc_private, 0 );
1143         op->o_tmpfree( sc, op->o_tmpmemctx );
1144         return 0;
1145 }
1146
1147 static int
1148 syncprov_op_abandon( Operation *op, SlapReply *rs )
1149 {
1150         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1151         syncprov_info_t         *si = on->on_bi.bi_private;
1152         syncops *so, **sop;
1153
1154         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1155         for ( sop=&si->si_ops; (so = *sop); sop = &(*sop)->s_next ) {
1156                 if ( so->s_op->o_connid == op->o_connid &&
1157                         so->s_op->o_msgid == op->orn_msgid ) {
1158                                 so->s_op->o_abandon = 1;
1159                                 *sop = so->s_next;
1160                                 break;
1161                 }
1162         }
1163         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1164         if ( so ) {
1165                 /* Is this really a Cancel exop? */
1166                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
1167                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
1168                         rs->sr_err = LDAP_CANCELLED;
1169                         send_ldap_result( so->s_op, rs );
1170                         if ( so->s_flags & PS_IS_DETACHED ) {
1171                                 slap_callback *cb;
1172                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
1173                                 cb->sc_cleanup = syncprov_ab_cleanup;
1174                                 cb->sc_next = op->o_callback;
1175                                 cb->sc_private = so;
1176                                 op->o_callback = cb;
1177                                 return SLAP_CB_CONTINUE;
1178                         }
1179                 }
1180                 syncprov_drop_psearch( so, 0 );
1181         }
1182         return SLAP_CB_CONTINUE;
1183 }
1184
1185 /* Find which persistent searches are affected by this operation */
1186 static void
1187 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
1188 {
1189         slap_overinst *on = opc->son;
1190         syncprov_info_t         *si = on->on_bi.bi_private;
1191
1192         fbase_cookie fc;
1193         syncops **pss;
1194         Entry *e = NULL;
1195         Attribute *a;
1196         int rc, gonext;
1197         struct berval newdn;
1198         int freefdn = 0;
1199         BackendDB *b0 = op->o_bd, db;
1200
1201         fc.fdn = &op->o_req_ndn;
1202         /* compute new DN */
1203         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1204                 struct berval pdn;
1205                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
1206                 else dnParent( fc.fdn, &pdn );
1207                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
1208                 fc.fdn = &newdn;
1209                 freefdn = 1;
1210         }
1211         if ( op->o_tag != LDAP_REQ_ADD ) {
1212                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1213                         db = *op->o_bd;
1214                         op->o_bd = &db;
1215                 }
1216                 rc = overlay_entry_get_ov( op, fc.fdn, NULL, NULL, 0, &e, on );
1217                 /* If we're sending responses now, make a copy and unlock the DB */
1218                 if ( e && !saveit ) {
1219                         if ( !opc->se )
1220                                 opc->se = entry_dup( e );
1221                         overlay_entry_release_ov( op, e, 0, on );
1222                         e = opc->se;
1223                 }
1224                 if ( rc ) {
1225                         op->o_bd = b0;
1226                         return;
1227                 }
1228         } else {
1229                 e = op->ora_e;
1230                 if ( !saveit ) {
1231                         if ( !opc->se )
1232                                 opc->se = entry_dup( e );
1233                         e = opc->se;
1234                 }
1235         }
1236
1237         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1238                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1239                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1240                 opc->sreference = is_entry_referral( e );
1241                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1242                 if ( a )
1243                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1244         } else if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1245                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1246                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1247                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1248                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1249         }
1250
1251         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1252         for (pss = &si->si_ops; *pss; pss = gonext ? &(*pss)->s_next : pss)
1253         {
1254                 Operation op2;
1255                 Opheader oh;
1256                 syncmatches *sm;
1257                 int found = 0;
1258                 syncops *snext, *ss = *pss;
1259
1260                 gonext = 1;
1261                 if ( ss->s_op->o_abandon )
1262                         continue;
1263
1264                 /* Don't send ops back to the originator */
1265                 if ( opc->osid > 0 && opc->osid == ss->s_sid ) {
1266                         Debug( LDAP_DEBUG_SYNC, "syncprov_matchops: skipping original sid %03x\n",
1267                                 opc->osid, 0, 0 );
1268                         continue;
1269                 }
1270
1271                 /* Don't send ops back to the messenger */
1272                 if ( opc->rsid > 0 && opc->rsid == ss->s_sid ) {
1273                         Debug( LDAP_DEBUG_SYNC, "syncprov_matchops: skipping relayed sid %03x\n",
1274                                 opc->rsid, 0, 0 );
1275                         continue;
1276                 }
1277
1278                 /* validate base */
1279                 fc.fss = ss;
1280                 fc.fbase = 0;
1281                 fc.fscope = 0;
1282
1283                 /* If the base of the search is missing, signal a refresh */
1284                 rc = syncprov_findbase( op, &fc );
1285                 if ( rc != LDAP_SUCCESS ) {
1286                         SlapReply rs = {REP_RESULT};
1287                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1288                                 "search base has changed" );
1289                         snext = ss->s_next;
1290                         if ( syncprov_drop_psearch( ss, 1 ) )
1291                                 *pss = snext;
1292                         gonext = 0;
1293                         continue;
1294                 }
1295
1296                 /* If we're sending results now, look for this op in old matches */
1297                 if ( !saveit ) {
1298                         syncmatches *old;
1299
1300                         /* Did we modify the search base? */
1301                         if ( dn_match( &op->o_req_ndn, &ss->s_base )) {
1302                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1303                                 ss->s_flags |= PS_WROTE_BASE;
1304                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1305                         }
1306
1307                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1308                                 old=sm, sm=sm->sm_next ) {
1309                                 if ( sm->sm_op == ss ) {
1310                                         found = 1;
1311                                         old->sm_next = sm->sm_next;
1312                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1313                                         break;
1314                                 }
1315                         }
1316                 }
1317
1318                 if ( fc.fscope ) {
1319                         ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1320                         op2 = *ss->s_op;
1321                         oh = *op->o_hdr;
1322                         oh.oh_conn = ss->s_op->o_conn;
1323                         oh.oh_connid = ss->s_op->o_connid;
1324                         op2.o_bd = op->o_bd->bd_self;
1325                         op2.o_hdr = &oh;
1326                         op2.o_extra = op->o_extra;
1327                         op2.o_callback = NULL;
1328                         if (ss->s_flags & PS_FIX_FILTER) {
1329                                 /* Skip the AND/GE clause that we stuck on in front. We
1330                                    would lose deletes/mods that happen during the refresh
1331                                    phase otherwise (ITS#6555) */
1332                                 op2.ors_filter = ss->s_op->ors_filter->f_and->f_next;
1333                         }
1334                         rc = test_filter( &op2, e, op2.ors_filter );
1335                         ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1336                 }
1337
1338                 Debug( LDAP_DEBUG_TRACE, "syncprov_matchops: sid %03x fscope %d rc %d\n",
1339                         ss->s_sid, fc.fscope, rc );
1340
1341                 /* check if current o_req_dn is in scope and matches filter */
1342                 if ( fc.fscope && rc == LDAP_COMPARE_TRUE ) {
1343                         if ( saveit ) {
1344                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1345                                 sm->sm_next = opc->smatches;
1346                                 sm->sm_op = ss;
1347                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1348                                 ++ss->s_inuse;
1349                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1350                                 opc->smatches = sm;
1351                         } else {
1352                                 /* if found send UPDATE else send ADD */
1353                                 syncprov_qresp( opc, ss,
1354                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD );
1355                         }
1356                 } else if ( !saveit && found ) {
1357                         /* send DELETE */
1358                         syncprov_qresp( opc, ss, LDAP_SYNC_DELETE );
1359                 } else if ( !saveit ) {
1360                         syncprov_qresp( opc, ss, LDAP_SYNC_NEW_COOKIE );
1361                 }
1362                 if ( !saveit && found ) {
1363                         /* Decrement s_inuse, was incremented when called
1364                          * with saveit == TRUE
1365                          */
1366                         snext = ss->s_next;
1367                         if ( syncprov_free_syncop( ss, 0 ) ) {
1368                                 *pss = snext;
1369                                 gonext = 0;
1370                         }
1371                 }
1372         }
1373         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1374
1375         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1376                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1377                         op->o_bd = &db;
1378                 }
1379                 if ( saveit )
1380                         overlay_entry_release_ov( op, e, 0, on );
1381                 op->o_bd = b0;
1382         }
1383         if ( !saveit ) {
1384                 if ( opc->ssres.s_info )
1385                         free_resinfo( &opc->ssres );
1386                 else if ( opc->se )
1387                         entry_free( opc->se );
1388         }
1389         if ( freefdn ) {
1390                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1391         }
1392         op->o_bd = b0;
1393 }
1394
1395 static int
1396 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1397 {
1398         slap_callback *cb = op->o_callback;
1399         opcookie *opc = cb->sc_private;
1400         slap_overinst *on = opc->son;
1401         syncprov_info_t         *si = on->on_bi.bi_private;
1402         syncmatches *sm, *snext;
1403         modtarget *mt;
1404
1405         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1406         if ( si->si_active )
1407                 si->si_active--;
1408         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1409
1410         for (sm = opc->smatches; sm; sm=snext) {
1411                 snext = sm->sm_next;
1412                 syncprov_free_syncop( sm->sm_op, 1 );
1413                 op->o_tmpfree( sm, op->o_tmpmemctx );
1414         }
1415
1416         /* Remove op from lock table */
1417         mt = opc->smt;
1418         if ( mt ) {
1419                 modinst *mi = (modinst *)(opc+1), **m2;
1420                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1421                 for (m2 = &mt->mt_mods; ; m2 = &(*m2)->mi_next) {
1422                         if ( *m2 == mi ) {
1423                                 *m2 = mi->mi_next;
1424                                 if ( mt->mt_tail == mi )
1425                                         mt->mt_tail = ( m2 == &mt->mt_mods ) ? NULL : (modinst *)m2;
1426                                 break;
1427                         }
1428                 }
1429                 /* If there are more, promote the next one */
1430                 if ( mt->mt_mods ) {
1431                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1432                 } else {
1433                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1434                         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1435                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1436                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1437                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1438                         ch_free( mt->mt_dn.bv_val );
1439                         ch_free( mt );
1440                 }
1441         }
1442         if ( !BER_BVISNULL( &opc->suuid ))
1443                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1444         if ( !BER_BVISNULL( &opc->sndn ))
1445                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1446         if ( !BER_BVISNULL( &opc->sdn ))
1447                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1448         op->o_callback = cb->sc_next;
1449         op->o_tmpfree(cb, op->o_tmpmemctx);
1450
1451         return 0;
1452 }
1453
1454 static void
1455 syncprov_checkpoint( Operation *op, slap_overinst *on )
1456 {
1457         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
1458         Modifications mod;
1459         Operation opm;
1460         SlapReply rsm = {REP_RESULT};
1461         slap_callback cb = {0};
1462         BackendDB be;
1463         BackendInfo *bi;
1464
1465 #ifdef CHECK_CSN
1466         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1467
1468         int i;
1469         for ( i=0; i<si->si_numcsns; i++ ) {
1470                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1471         }
1472 #endif
1473         mod.sml_numvals = si->si_numcsns;
1474         mod.sml_values = si->si_ctxcsn;
1475         mod.sml_nvalues = NULL;
1476         mod.sml_desc = slap_schema.si_ad_contextCSN;
1477         mod.sml_op = LDAP_MOD_REPLACE;
1478         mod.sml_flags = SLAP_MOD_INTERNAL;
1479         mod.sml_next = NULL;
1480
1481         cb.sc_response = slap_null_cb;
1482         opm = *op;
1483         opm.o_tag = LDAP_REQ_MODIFY;
1484         opm.o_callback = &cb;
1485         opm.orm_modlist = &mod;
1486         opm.orm_no_opattrs = 1;
1487         if ( SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1488                 be = *on->on_info->oi_origdb;
1489                 opm.o_bd = &be;
1490         }
1491         opm.o_req_dn = si->si_contextdn;
1492         opm.o_req_ndn = si->si_contextdn;
1493         bi = opm.o_bd->bd_info;
1494         opm.o_bd->bd_info = on->on_info->oi_orig;
1495         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1496         opm.o_no_schema_check = 1;
1497         opm.o_dont_replicate = 1;
1498         opm.o_opid = -1;
1499         opm.o_bd->be_modify( &opm, &rsm );
1500
1501         if ( rsm.sr_err == LDAP_NO_SUCH_OBJECT &&
1502                 SLAP_SYNC_SUBENTRY( opm.o_bd )) {
1503                 const char      *text;
1504                 char txtbuf[SLAP_TEXT_BUFLEN];
1505                 size_t textlen = sizeof txtbuf;
1506                 Entry *e = slap_create_context_csn_entry( opm.o_bd, NULL );
1507                 rs_reinit( &rsm, REP_RESULT );
1508                 slap_mods2entry( &mod, &e, 0, 1, &text, txtbuf, textlen);
1509                 opm.ora_e = e;
1510                 opm.o_bd->be_add( &opm, &rsm );
1511                 if ( e == opm.ora_e )
1512                         be_entry_release_w( &opm, opm.ora_e );
1513         }
1514         opm.o_bd->bd_info = bi;
1515
1516         if ( mod.sml_next != NULL ) {
1517                 slap_mods_free( mod.sml_next, 1 );
1518         }
1519 #ifdef CHECK_CSN
1520         for ( i=0; i<si->si_numcsns; i++ ) {
1521                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1522         }
1523 #endif
1524 }
1525
1526 static void
1527 syncprov_add_slog( Operation *op )
1528 {
1529         opcookie *opc = op->o_callback->sc_private;
1530         slap_overinst *on = opc->son;
1531         syncprov_info_t         *si = on->on_bi.bi_private;
1532         sessionlog *sl;
1533         slog_entry *se;
1534
1535         sl = si->si_logs;
1536         {
1537                 if ( BER_BVISEMPTY( &op->o_csn ) ) {
1538                         /* During the syncrepl refresh phase we can receive operations
1539                          * without a csn.  We cannot reliably determine the consumers
1540                          * state with respect to such operations, so we ignore them and
1541                          * wipe out anything in the log if we see them.
1542                          */
1543                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1544                         /* can only do this if no one else is reading the log at the moment */
1545                         if (!sl->sl_playing) {
1546                         while ( se = sl->sl_head ) {
1547                                 sl->sl_head = se->se_next;
1548                                 ch_free( se );
1549                         }
1550                         sl->sl_tail = NULL;
1551                         sl->sl_num = 0;
1552                         }
1553                         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1554                         return;
1555                 }
1556
1557                 /* Allocate a record. UUIDs are not NUL-terminated. */
1558                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1559                         op->o_csn.bv_len + 1 );
1560                 se->se_next = NULL;
1561                 se->se_tag = op->o_tag;
1562
1563                 se->se_uuid.bv_val = (char *)(&se[1]);
1564                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1565                 se->se_uuid.bv_len = opc->suuid.bv_len;
1566
1567                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1568                 AC_MEMCPY( se->se_csn.bv_val, op->o_csn.bv_val, op->o_csn.bv_len );
1569                 se->se_csn.bv_val[op->o_csn.bv_len] = '\0';
1570                 se->se_csn.bv_len = op->o_csn.bv_len;
1571                 se->se_sid = slap_parse_csn_sid( &se->se_csn );
1572
1573                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1574                 if ( sl->sl_head ) {
1575                         /* Keep the list in csn order. */
1576                         if ( ber_bvcmp( &sl->sl_tail->se_csn, &se->se_csn ) <= 0 ) {
1577                                 sl->sl_tail->se_next = se;
1578                                 sl->sl_tail = se;
1579                         } else {
1580                                 slog_entry **sep;
1581
1582                                 for ( sep = &sl->sl_head; *sep; sep = &(*sep)->se_next ) {
1583                                         if ( ber_bvcmp( &se->se_csn, &(*sep)->se_csn ) < 0 ) {
1584                                                 se->se_next = *sep;
1585                                                 *sep = se;
1586                                                 break;
1587                                         }
1588                                 }
1589                         }
1590                 } else {
1591                         sl->sl_head = se;
1592                         sl->sl_tail = se;
1593                         if ( !sl->sl_mincsn ) {
1594                                 sl->sl_numcsns = 1;
1595                                 sl->sl_mincsn = ch_malloc( 2*sizeof( struct berval ));
1596                                 sl->sl_sids = ch_malloc( sizeof( int ));
1597                                 sl->sl_sids[0] = se->se_sid;
1598                                 ber_dupbv( sl->sl_mincsn, &se->se_csn );
1599                                 BER_BVZERO( &sl->sl_mincsn[1] );
1600                         }
1601                 }
1602                 sl->sl_num++;
1603                 if (!sl->sl_playing) {
1604                 while ( sl->sl_num > sl->sl_size ) {
1605                         int i;
1606                         se = sl->sl_head;
1607                         sl->sl_head = se->se_next;
1608                         for ( i=0; i<sl->sl_numcsns; i++ )
1609                                 if ( sl->sl_sids[i] >= se->se_sid )
1610                                         break;
1611                         if  ( i == sl->sl_numcsns || sl->sl_sids[i] != se->se_sid ) {
1612                                 slap_insert_csn_sids( (struct sync_cookie *)sl,
1613                                         i, se->se_sid, &se->se_csn );
1614                         } else {
1615                                 ber_bvreplace( &sl->sl_mincsn[i], &se->se_csn );
1616                         }
1617                         ch_free( se );
1618                         sl->sl_num--;
1619                 }
1620                 }
1621                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1622         }
1623 }
1624
1625 /* Just set a flag if we found the matching entry */
1626 static int
1627 playlog_cb( Operation *op, SlapReply *rs )
1628 {
1629         if ( rs->sr_type == REP_SEARCH ) {
1630                 op->o_callback->sc_private = (void *)1;
1631         }
1632         return rs->sr_err;
1633 }
1634
1635 /* enter with sl->sl_mutex locked, release before returning */
1636 static void
1637 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1638         sync_control *srs, BerVarray ctxcsn, int numcsns, int *sids )
1639 {
1640         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1641         slog_entry *se;
1642         int i, j, ndel, num, nmods, mmods;
1643         char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
1644         BerVarray uuids;
1645         struct berval delcsn[2];
1646
1647         if ( !sl->sl_num ) {
1648                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1649                 return;
1650         }
1651
1652         num = sl->sl_num;
1653         i = 0;
1654         nmods = 0;
1655         sl->sl_playing++;
1656         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1657
1658         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1659                 num * UUID_LEN, op->o_tmpmemctx );
1660         uuids[0].bv_val = (char *)(uuids + num + 1);
1661
1662         delcsn[0].bv_len = 0;
1663         delcsn[0].bv_val = cbuf;
1664         BER_BVZERO(&delcsn[1]);
1665
1666         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1667          * and everything else at the end. Do this first so we can
1668          * unlock the list mutex.
1669          */
1670         Debug( LDAP_DEBUG_SYNC, "srs csn %s\n",
1671                 srs->sr_state.ctxcsn[0].bv_val, 0, 0 );
1672         for ( se=sl->sl_head; se; se=se->se_next ) {
1673                 int k;
1674                 Debug( LDAP_DEBUG_SYNC, "log csn %s\n", se->se_csn.bv_val, 0, 0 );
1675                 ndel = 1;
1676                 for ( k=0; k<srs->sr_state.numcsns; k++ ) {
1677                         if ( se->se_sid == srs->sr_state.sids[k] ) {
1678                                 ndel = ber_bvcmp( &se->se_csn, &srs->sr_state.ctxcsn[k] );
1679                                 break;
1680                         }
1681                 }
1682                 if ( ndel <= 0 ) {
1683                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too old\n", ndel, 0, 0 );
1684                         continue;
1685                 }
1686                 ndel = 0;
1687                 for ( k=0; k<numcsns; k++ ) {
1688                         if ( se->se_sid == sids[k] ) {
1689                                 ndel = ber_bvcmp( &se->se_csn, &ctxcsn[k] );
1690                                 break;
1691                         }
1692                 }
1693                 if ( ndel > 0 ) {
1694                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too new\n", ndel, 0, 0 );
1695                         break;
1696                 }
1697                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1698                         j = i;
1699                         i++;
1700                         AC_MEMCPY( cbuf, se->se_csn.bv_val, se->se_csn.bv_len );
1701                         delcsn[0].bv_len = se->se_csn.bv_len;
1702                         delcsn[0].bv_val[delcsn[0].bv_len] = '\0';
1703                 } else {
1704                         if ( se->se_tag == LDAP_REQ_ADD )
1705                                 continue;
1706                         nmods++;
1707                         j = num - nmods;
1708                 }
1709                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1710                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1711                 uuids[j].bv_len = UUID_LEN;
1712         }
1713         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1714         sl->sl_playing--;
1715         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1716
1717         ndel = i;
1718
1719         /* Zero out unused slots */
1720         for ( i=ndel; i < num - nmods; i++ )
1721                 uuids[i].bv_len = 0;
1722
1723         /* Mods must be validated to see if they belong in this delete set.
1724          */
1725
1726         mmods = nmods;
1727         /* Strip any duplicates */
1728         for ( i=0; i<nmods; i++ ) {
1729                 for ( j=0; j<ndel; j++ ) {
1730                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1731                                 uuids[num - 1 - i].bv_len = 0;
1732                                 mmods --;
1733                                 break;
1734                         }
1735                 }
1736                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1737                 for ( j=0; j<i; j++ ) {
1738                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1739                                 uuids[num - 1 - i].bv_len = 0;
1740                                 mmods --;
1741                                 break;
1742                         }
1743                 }
1744         }
1745
1746         if ( mmods ) {
1747                 Operation fop;
1748                 int rc;
1749                 Filter mf, af;
1750                 AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
1751                 slap_callback cb = {0};
1752
1753                 fop = *op;
1754
1755                 fop.o_sync_mode = 0;
1756                 fop.o_callback = &cb;
1757                 fop.ors_limit = NULL;
1758                 fop.ors_tlimit = SLAP_NO_LIMIT;
1759                 fop.ors_attrs = slap_anlist_all_attributes;
1760                 fop.ors_attrsonly = 0;
1761                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1762
1763                 af.f_choice = LDAP_FILTER_AND;
1764                 af.f_next = NULL;
1765                 af.f_and = &mf;
1766                 mf.f_choice = LDAP_FILTER_EQUALITY;
1767                 mf.f_ava = &eq;
1768                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1769                 mf.f_next = fop.ors_filter;
1770
1771                 fop.ors_filter = &af;
1772
1773                 cb.sc_response = playlog_cb;
1774                 fop.o_bd->bd_info = (BackendInfo *)on->on_info;
1775
1776                 for ( i=ndel; i<num; i++ ) {
1777                   if ( uuids[i].bv_len != 0 ) {
1778                         SlapReply frs = { REP_RESULT };
1779
1780                         mf.f_av_value = uuids[i];
1781                         cb.sc_private = NULL;
1782                         fop.ors_slimit = 1;
1783                         rc = fop.o_bd->be_search( &fop, &frs );
1784
1785                         /* If entry was not found, add to delete list */
1786                         if ( !cb.sc_private ) {
1787                                 uuids[ndel++] = uuids[i];
1788                         }
1789                   }
1790                 }
1791                 fop.o_bd->bd_info = (BackendInfo *)on;
1792         }
1793         if ( ndel ) {
1794                 struct berval cookie;
1795
1796                 if ( delcsn[0].bv_len ) {
1797                         slap_compose_sync_cookie( op, &cookie, delcsn, srs->sr_state.rid,
1798                                 slap_serverID ? slap_serverID : -1 );
1799
1800                         Debug( LDAP_DEBUG_SYNC, "syncprov_playlog: cookie=%s\n", cookie.bv_val, 0, 0 );
1801                 }
1802
1803                 uuids[ndel].bv_val = NULL;
1804                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET,
1805                         delcsn[0].bv_len ? &cookie : NULL, 0, uuids, 1 );
1806                 if ( delcsn[0].bv_len ) {
1807                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1808                 }
1809         }
1810         op->o_tmpfree( uuids, op->o_tmpmemctx );
1811 }
1812
1813 static int
1814 syncprov_new_ctxcsn( opcookie *opc, syncprov_info_t *si, int csn_changed, int numvals, BerVarray vals )
1815 {
1816         unsigned i;
1817         int j, sid;
1818
1819         for ( i=0; i<numvals; i++ ) {
1820                 sid = slap_parse_csn_sid( &vals[i] );
1821                 for ( j=0; j<si->si_numcsns; j++ ) {
1822                         if ( sid < si->si_sids[j] )
1823                                 break;
1824                         if ( sid == si->si_sids[j] ) {
1825                                 if ( ber_bvcmp( &vals[i], &si->si_ctxcsn[j] ) > 0 ) {
1826                                         ber_bvreplace( &si->si_ctxcsn[j], &vals[i] );
1827                                         csn_changed = 1;
1828                                 }
1829                                 break;
1830                         }
1831                 }
1832
1833                 if ( j == si->si_numcsns || sid != si->si_sids[j] ) {
1834                         slap_insert_csn_sids( (struct sync_cookie *)&si->si_ctxcsn,
1835                                 j, sid, &vals[i] );
1836                         csn_changed = 1;
1837                 }
1838         }
1839         if ( csn_changed )
1840                 si->si_dirty = 0;
1841         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1842
1843         if ( csn_changed ) {
1844                 syncops *ss;
1845                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1846                 for ( ss = si->si_ops; ss; ss = ss->s_next ) {
1847                         if ( ss->s_op->o_abandon )
1848                                 continue;
1849                         /* Send the updated csn to all syncrepl consumers,
1850                          * including the server from which it originated.
1851                          * The syncrepl consumer and syncprov provider on
1852                          * the originating server may be configured to store
1853                          * their csn values in different entries.
1854                          */
1855                         syncprov_qresp( opc, ss, LDAP_SYNC_NEW_COOKIE );
1856                 }
1857                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1858         }
1859         return csn_changed;
1860 }
1861
1862 static int
1863 syncprov_op_response( Operation *op, SlapReply *rs )
1864 {
1865         opcookie *opc = op->o_callback->sc_private;
1866         slap_overinst *on = opc->son;
1867         syncprov_info_t         *si = on->on_bi.bi_private;
1868         syncmatches *sm;
1869
1870         if ( rs->sr_err == LDAP_SUCCESS )
1871         {
1872                 struct berval maxcsn;
1873                 char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
1874                 int do_check = 0, have_psearches, foundit, csn_changed = 0;
1875
1876                 ldap_pvt_thread_mutex_lock( &si->si_resp_mutex );
1877
1878                 /* Update our context CSN */
1879                 cbuf[0] = '\0';
1880                 maxcsn.bv_val = cbuf;
1881                 maxcsn.bv_len = sizeof(cbuf);
1882                 ldap_pvt_thread_rdwr_wlock( &si->si_csn_rwlock );
1883
1884                 slap_get_commit_csn( op, &maxcsn, &foundit );
1885                 if ( BER_BVISEMPTY( &maxcsn ) && SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1886                         /* syncrepl queues the CSN values in the db where
1887                          * it is configured , not where the changes are made.
1888                          * So look for a value in the glue db if we didn't
1889                          * find any in this db.
1890                          */
1891                         BackendDB *be = op->o_bd;
1892                         op->o_bd = select_backend( &be->be_nsuffix[0], 1);
1893                         maxcsn.bv_val = cbuf;
1894                         maxcsn.bv_len = sizeof(cbuf);
1895                         slap_get_commit_csn( op, &maxcsn, &foundit );
1896                         op->o_bd = be;
1897                 }
1898                 if ( !BER_BVISEMPTY( &maxcsn ) ) {
1899                         int i, sid;
1900 #ifdef CHECK_CSN
1901                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1902                         assert( !syn->ssyn_validate( syn, &maxcsn ));
1903 #endif
1904                         sid = slap_parse_csn_sid( &maxcsn );
1905                         for ( i=0; i<si->si_numcsns; i++ ) {
1906                                 if ( sid < si->si_sids[i] )
1907                                         break;
1908                                 if ( sid == si->si_sids[i] ) {
1909                                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn[i] ) > 0 ) {
1910                                                 ber_bvreplace( &si->si_ctxcsn[i], &maxcsn );
1911                                                 csn_changed = 1;
1912                                         }
1913                                         break;
1914                                 }
1915                         }
1916                         /* It's a new SID for us */
1917                         if ( i == si->si_numcsns || sid != si->si_sids[i] ) {
1918                                 slap_insert_csn_sids((struct sync_cookie *)&(si->si_ctxcsn),
1919                                         i, sid, &maxcsn );
1920                                 csn_changed = 1;
1921                         }
1922                 }
1923
1924                 /* Don't do any processing for consumer contextCSN updates */
1925                 if ( SLAPD_SYNC_IS_SYNCCONN( op->o_connid ) &&
1926                         op->o_tag == LDAP_REQ_MODIFY &&
1927                         op->orm_modlist->sml_op == LDAP_MOD_REPLACE &&
1928                         op->orm_modlist->sml_desc == slap_schema.si_ad_contextCSN ) {
1929                         /* Catch contextCSN updates from syncrepl. We have to look at
1930                          * all the attribute values, as there may be more than one csn
1931                          * that changed, and only one can be passed in the csn queue.
1932                          */
1933                         csn_changed = syncprov_new_ctxcsn( opc, si, csn_changed,
1934                                 op->orm_modlist->sml_numvals, op->orm_modlist->sml_values );
1935                         if ( csn_changed )
1936                                 si->si_numops++;
1937                         goto leave;
1938                 }
1939                 if ( op->o_dont_replicate ) {
1940                         if ( csn_changed )
1941                                 si->si_numops++;
1942                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1943                         goto leave;
1944                 }
1945
1946                 /* If we're adding the context entry, parse all of its contextCSNs */
1947                 if ( op->o_tag == LDAP_REQ_ADD &&
1948                         dn_match( &op->o_req_ndn, &si->si_contextdn )) {
1949                         Attribute *a = attr_find( op->ora_e->e_attrs, slap_schema.si_ad_contextCSN );
1950                         if ( a ) {
1951                                 csn_changed = syncprov_new_ctxcsn( opc, si, csn_changed, a->a_numvals, a->a_vals );
1952                                 if ( csn_changed )
1953                                         si->si_numops++;
1954                                 goto added;
1955                         }
1956                 }
1957
1958                 if ( csn_changed )
1959                         si->si_numops++;
1960                 if ( si->si_chkops || si->si_chktime ) {
1961                         /* Never checkpoint adding the context entry,
1962                          * it will deadlock
1963                          */
1964                         if ( op->o_tag != LDAP_REQ_ADD ||
1965                                 !dn_match( &op->o_req_ndn, &si->si_contextdn )) {
1966                                 if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1967                                         do_check = 1;
1968                                         si->si_numops = 0;
1969                                 }
1970                                 if ( si->si_chktime &&
1971                                         (op->o_time - si->si_chklast >= si->si_chktime )) {
1972                                         if ( si->si_chklast ) {
1973                                                 do_check = 1;
1974                                                 si->si_chklast = op->o_time;
1975                                         } else {
1976                                                 si->si_chklast = 1;
1977                                         }
1978                                 }
1979                         }
1980                 }
1981                 si->si_dirty = !csn_changed;
1982                 ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1983
1984 added:
1985                 if ( do_check ) {
1986                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1987                         syncprov_checkpoint( op, on );
1988                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1989                 }
1990
1991                 /* only update consumer ctx if this is a newer csn */
1992                 if ( csn_changed ) {
1993                         opc->sctxcsn = maxcsn;
1994                 }
1995
1996                 /* Handle any persistent searches */
1997                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1998                 have_psearches = ( si->si_ops != NULL );
1999                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2000                 if ( have_psearches ) {
2001                         switch(op->o_tag) {
2002                         case LDAP_REQ_ADD:
2003                         case LDAP_REQ_MODIFY:
2004                         case LDAP_REQ_MODRDN:
2005                         case LDAP_REQ_EXTENDED:
2006                                 syncprov_matchops( op, opc, 0 );
2007                                 break;
2008                         case LDAP_REQ_DELETE:
2009                                 /* for each match in opc->smatches:
2010                                  *   send DELETE msg
2011                                  */
2012                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
2013                                         if ( sm->sm_op->s_op->o_abandon )
2014                                                 continue;
2015                                         syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_DELETE );
2016                                 }
2017                                 if ( opc->ssres.s_info )
2018                                         free_resinfo( &opc->ssres );
2019                                 break;
2020                         }
2021                 }
2022
2023                 /* Add any log records */
2024                 if ( si->si_logs ) {
2025                         syncprov_add_slog( op );
2026                 }
2027 leave:          ldap_pvt_thread_mutex_unlock( &si->si_resp_mutex );
2028         }
2029         return SLAP_CB_CONTINUE;
2030 }
2031
2032 /* We don't use a subentry to store the context CSN any more.
2033  * We expose the current context CSN as an operational attribute
2034  * of the suffix entry.
2035  */
2036 static int
2037 syncprov_op_compare( Operation *op, SlapReply *rs )
2038 {
2039         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2040         syncprov_info_t         *si = on->on_bi.bi_private;
2041         int rc = SLAP_CB_CONTINUE;
2042
2043         if ( dn_match( &op->o_req_ndn, &si->si_contextdn ) &&
2044                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
2045         {
2046                 Entry e = {0};
2047                 Attribute a = {0};
2048
2049                 e.e_name = si->si_contextdn;
2050                 e.e_nname = si->si_contextdn;
2051                 e.e_attrs = &a;
2052
2053                 a.a_desc = slap_schema.si_ad_contextCSN;
2054
2055                 ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2056
2057                 a.a_vals = si->si_ctxcsn;
2058                 a.a_nvals = a.a_vals;
2059                 a.a_numvals = si->si_numcsns;
2060
2061                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
2062                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
2063                 if ( ! rs->sr_err ) {
2064                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
2065                         goto return_results;
2066                 }
2067
2068                 if ( get_assert( op ) &&
2069                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
2070                 {
2071                         rs->sr_err = LDAP_ASSERTION_FAILED;
2072                         goto return_results;
2073                 }
2074
2075
2076                 rs->sr_err = LDAP_COMPARE_FALSE;
2077
2078                 if ( attr_valfind( &a,
2079                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
2080                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
2081                                 &op->oq_compare.rs_ava->aa_value, NULL, op->o_tmpmemctx ) == 0 )
2082                 {
2083                         rs->sr_err = LDAP_COMPARE_TRUE;
2084                 }
2085
2086 return_results:;
2087
2088                 ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2089
2090                 send_ldap_result( op, rs );
2091
2092                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
2093                         rs->sr_err = LDAP_SUCCESS;
2094                 }
2095                 rc = rs->sr_err;
2096         }
2097
2098         return rc;
2099 }
2100
2101 static int
2102 syncprov_op_mod( Operation *op, SlapReply *rs )
2103 {
2104         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2105         syncprov_info_t         *si = on->on_bi.bi_private;
2106         slap_callback *cb;
2107         opcookie *opc;
2108         int have_psearches, cbsize;
2109
2110         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2111         have_psearches = ( si->si_ops != NULL );
2112         si->si_active++;
2113         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2114
2115         cbsize = sizeof(slap_callback) + sizeof(opcookie) +
2116                 (have_psearches ? sizeof(modinst) : 0 );
2117
2118         cb = op->o_tmpcalloc(1, cbsize, op->o_tmpmemctx);
2119         opc = (opcookie *)(cb+1);
2120         opc->son = on;
2121         cb->sc_response = syncprov_op_response;
2122         cb->sc_cleanup = syncprov_op_cleanup;
2123         cb->sc_private = opc;
2124         cb->sc_next = op->o_callback;
2125         op->o_callback = cb;
2126
2127         opc->osid = -1;
2128         opc->rsid = -1;
2129         if ( op->o_csn.bv_val ) {
2130                 opc->osid = slap_parse_csn_sid( &op->o_csn );
2131         }
2132         if ( op->o_controls ) {
2133                 struct sync_cookie *scook =
2134                 op->o_controls[slap_cids.sc_LDAPsync];
2135                 if ( scook )
2136                         opc->rsid = scook->sid;
2137         }
2138
2139         if ( op->o_dont_replicate )
2140                 return SLAP_CB_CONTINUE;
2141
2142         /* If there are active persistent searches, lock this operation.
2143          * See seqmod.c for the locking logic on its own.
2144          */
2145         if ( have_psearches ) {
2146                 modtarget *mt, mtdummy;
2147                 modinst *mi;
2148
2149                 mi = (modinst *)(opc+1);
2150                 mi->mi_op = op;
2151
2152                 /* See if we're already modifying this entry... */
2153                 mtdummy.mt_dn = op->o_req_ndn;
2154 retry:
2155                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
2156                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
2157                 if ( mt ) {
2158                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
2159                         if ( mt->mt_mods == NULL ) {
2160                                 /* Cannot reuse this mt, as another thread is about
2161                                  * to release it in syncprov_op_cleanup. Wait for them
2162                                  * to finish; our own insert is required to succeed.
2163                                  */
2164                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2165                                 ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
2166                                 ldap_pvt_thread_yield();
2167                                 goto retry;
2168                         }
2169                 }
2170                 if ( mt ) {
2171                         mt->mt_tail->mi_next = mi;
2172                         mt->mt_tail = mi;
2173                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
2174                         /* wait for this op to get to head of list */
2175                         while ( mt->mt_mods != mi ) {
2176                                 modinst *m2;
2177                                 /* don't wait on other mods from the same thread */
2178                                 for ( m2 = mt->mt_mods; m2; m2 = m2->mi_next ) {
2179                                         if ( m2->mi_op->o_threadctx == op->o_threadctx ) {
2180                                                 break;
2181                                         }
2182                                 }
2183                                 if ( m2 )
2184                                         break;
2185
2186                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2187                                 /* FIXME: if dynamic config can delete overlays or
2188                                  * databases we'll have to check for cleanup here.
2189                                  * Currently it's not an issue because there are
2190                                  * no dynamic config deletes...
2191                                  */
2192                                 if ( slapd_shutdown )
2193                                         return SLAPD_ABANDON;
2194
2195                                 if ( !ldap_pvt_thread_pool_pausecheck( &connection_pool ))
2196                                         ldap_pvt_thread_yield();
2197                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
2198
2199                                 /* clean up if the caller is giving up */
2200                                 if ( op->o_abandon ) {
2201                                         modinst **m2;
2202                                         slap_callback **sc;
2203                                         for (m2 = &mt->mt_mods; ; m2 = &(*m2)->mi_next) {
2204                                                 if ( *m2 == mi ) {
2205                                                         *m2 = mi->mi_next;
2206                                                         if ( mt->mt_tail == mi )
2207                                                                 mt->mt_tail = ( m2 == &mt->mt_mods ) ? NULL : (modinst *)m2;
2208                                                         break;
2209                                                 }
2210                                         }
2211                                         for (sc = &op->o_callback; ; sc = &(*sc)->sc_next) {
2212                                                 if ( *sc == cb ) {
2213                                                         *sc = cb->sc_next;
2214                                                         break;
2215                                                 }
2216                                         }
2217                                         op->o_tmpfree( cb, op->o_tmpmemctx );
2218                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2219                                         return SLAPD_ABANDON;
2220                                 }
2221                         }
2222                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2223                 } else {
2224                         /* Record that we're modifying this entry now */
2225                         mt = ch_malloc( sizeof(modtarget) );
2226                         mt->mt_mods = mi;
2227                         mt->mt_tail = mi;
2228                         ber_dupbv( &mt->mt_dn, &mi->mi_op->o_req_ndn );
2229                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
2230                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
2231                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
2232                 }
2233                 opc->smt = mt;
2234         }
2235
2236         if (( have_psearches || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
2237                 syncprov_matchops( op, opc, 1 );
2238
2239         return SLAP_CB_CONTINUE;
2240 }
2241
2242 static int
2243 syncprov_op_extended( Operation *op, SlapReply *rs )
2244 {
2245         if ( exop_is_write( op ))
2246                 return syncprov_op_mod( op, rs );
2247
2248         return SLAP_CB_CONTINUE;
2249 }
2250
2251 typedef struct searchstate {
2252         slap_overinst *ss_on;
2253         syncops *ss_so;
2254         BerVarray ss_ctxcsn;
2255         int *ss_sids;
2256         int ss_numcsns;
2257 #define SS_PRESENT      0x01
2258 #define SS_CHANGED      0x02
2259         int ss_flags;
2260 } searchstate;
2261
2262 typedef struct SyncOperationBuffer {
2263         Operation               sob_op;
2264         Opheader                sob_hdr;
2265         OpExtra                 sob_oe;
2266         AttributeName   sob_extra;      /* not always present */
2267         /* Further data allocated here */
2268 } SyncOperationBuffer;
2269
2270 static void
2271 syncprov_detach_op( Operation *op, syncops *so, slap_overinst *on )
2272 {
2273         SyncOperationBuffer *sopbuf2;
2274         Operation *op2;
2275         int i, alen = 0;
2276         size_t size;
2277         char *ptr;
2278         GroupAssertion *g1, *g2;
2279
2280         /* count the search attrs */
2281         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2282                 alen += op->ors_attrs[i].an_name.bv_len + 1;
2283         }
2284         /* Make a new copy of the operation */
2285         size = offsetof( SyncOperationBuffer, sob_extra ) +
2286                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
2287                 op->o_req_dn.bv_len + 1 +
2288                 op->o_req_ndn.bv_len + 1 +
2289                 op->o_ndn.bv_len + 1 +
2290                 so->s_filterstr.bv_len + 1;
2291         sopbuf2 = ch_calloc( 1, size );
2292         op2 = &sopbuf2->sob_op;
2293         op2->o_hdr = &sopbuf2->sob_hdr;
2294         LDAP_SLIST_FIRST(&op2->o_extra) = &sopbuf2->sob_oe;
2295
2296         /* Copy the fields we care about explicitly, leave the rest alone */
2297         *op2->o_hdr = *op->o_hdr;
2298         op2->o_tag = op->o_tag;
2299         op2->o_time = op->o_time;
2300         op2->o_bd = on->on_info->oi_origdb;
2301         op2->o_request = op->o_request;
2302         op2->o_managedsait = op->o_managedsait;
2303         LDAP_SLIST_FIRST(&op2->o_extra)->oe_key = on;
2304         LDAP_SLIST_NEXT(LDAP_SLIST_FIRST(&op2->o_extra), oe_next) = NULL;
2305
2306         ptr = (char *) sopbuf2 + offsetof( SyncOperationBuffer, sob_extra );
2307         if ( i ) {
2308                 op2->ors_attrs = (AttributeName *) ptr;
2309                 ptr = (char *) &op2->ors_attrs[i+1];
2310                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2311                         op2->ors_attrs[i] = op->ors_attrs[i];
2312                         op2->ors_attrs[i].an_name.bv_val = ptr;
2313                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
2314                 }
2315                 BER_BVZERO( &op2->ors_attrs[i].an_name );
2316         }
2317
2318         op2->o_authz = op->o_authz;
2319         op2->o_ndn.bv_val = ptr;
2320         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
2321         op2->o_dn = op2->o_ndn;
2322         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
2323         op2->o_req_dn.bv_val = ptr;
2324         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
2325         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
2326         op2->o_req_ndn.bv_val = ptr;
2327         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
2328         op2->ors_filterstr.bv_val = ptr;
2329         strcpy( ptr, so->s_filterstr.bv_val );
2330         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
2331
2332         /* Skip the AND/GE clause that we stuck on in front */
2333         if ( so->s_flags & PS_FIX_FILTER ) {
2334                 op2->ors_filter = op->ors_filter->f_and->f_next;
2335                 so->s_flags ^= PS_FIX_FILTER;
2336         } else {
2337                 op2->ors_filter = op->ors_filter;
2338         }
2339         op2->ors_filter = filter_dup( op2->ors_filter, NULL );
2340         so->s_op = op2;
2341
2342         /* Copy any cached group ACLs individually */
2343         op2->o_groups = NULL;
2344         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
2345                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
2346                 *g2 = *g1;
2347                 strcpy( g2->ga_ndn, g1->ga_ndn );
2348                 g2->ga_next = op2->o_groups;
2349                 op2->o_groups = g2;
2350         }
2351         /* Don't allow any further group caching */
2352         op2->o_do_not_cache = 1;
2353
2354         /* Add op2 to conn so abandon will find us */
2355         op->o_conn->c_n_ops_executing++;
2356         op->o_conn->c_n_ops_completed--;
2357         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
2358         so->s_flags |= PS_IS_DETACHED;
2359
2360         /* Prevent anyone else from trying to send a result for this op */
2361         op->o_abandon = 1;
2362 }
2363
2364 static int
2365 syncprov_search_response( Operation *op, SlapReply *rs )
2366 {
2367         searchstate *ss = op->o_callback->sc_private;
2368         slap_overinst *on = ss->ss_on;
2369         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2370         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
2371
2372         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
2373                 Attribute *a;
2374                 /* If we got a referral without a referral object, there's
2375                  * something missing that we cannot replicate. Just ignore it.
2376                  * The consumer will abort because we didn't send the expected
2377                  * control.
2378                  */
2379                 if ( !rs->sr_entry ) {
2380                         assert( rs->sr_entry != NULL );
2381                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
2382                         return SLAP_CB_CONTINUE;
2383                 }
2384                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryCSN );
2385                 if ( a == NULL && rs->sr_operational_attrs != NULL ) {
2386                         a = attr_find( rs->sr_operational_attrs, slap_schema.si_ad_entryCSN );
2387                 }
2388                 if ( a ) {
2389                         int i, sid;
2390                         sid = slap_parse_csn_sid( &a->a_nvals[0] );
2391
2392                         /* If not a persistent search */
2393                         if ( !ss->ss_so ) {
2394                                 /* Make sure entry is less than the snapshot'd contextCSN */
2395                                 for ( i=0; i<ss->ss_numcsns; i++ ) {
2396                                         if ( sid == ss->ss_sids[i] && ber_bvcmp( &a->a_nvals[0],
2397                                                 &ss->ss_ctxcsn[i] ) > 0 ) {
2398                                                 Debug( LDAP_DEBUG_SYNC,
2399                                                         "Entry %s CSN %s greater than snapshot %s\n",
2400                                                         rs->sr_entry->e_name.bv_val,
2401                                                         a->a_nvals[0].bv_val,
2402                                                         ss->ss_ctxcsn[i].bv_val );
2403                                                 return LDAP_SUCCESS;
2404                                         }
2405                                 }
2406                         }
2407
2408                         /* Don't send old entries twice */
2409                         if ( srs->sr_state.ctxcsn ) {
2410                                 for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2411                                         if ( sid == srs->sr_state.sids[i] &&
2412                                                 ber_bvcmp( &a->a_nvals[0],
2413                                                         &srs->sr_state.ctxcsn[i] )<= 0 ) {
2414                                                 Debug( LDAP_DEBUG_SYNC,
2415                                                         "Entry %s CSN %s older or equal to ctx %s\n",
2416                                                         rs->sr_entry->e_name.bv_val,
2417                                                         a->a_nvals[0].bv_val,
2418                                                         srs->sr_state.ctxcsn[i].bv_val );
2419                                                 return LDAP_SUCCESS;
2420                                         }
2421                                 }
2422                         }
2423                 }
2424                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2425                         op->o_tmpmemctx );
2426                 rs->sr_ctrls[1] = NULL;
2427                 rs->sr_flags |= REP_CTRLS_MUSTBEFREED;
2428                 /* If we're in delta-sync mode, always send a cookie */
2429                 if ( si->si_nopres && si->si_usehint && a ) {
2430                         struct berval cookie;
2431                         slap_compose_sync_cookie( op, &cookie, a->a_nvals, srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2432                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2433                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 1, &cookie );
2434                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2435                 } else {
2436                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2437                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
2438                 }
2439         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
2440                 struct berval cookie = BER_BVNULL;
2441
2442                 if ( ( ss->ss_flags & SS_CHANGED ) &&
2443                         ss->ss_ctxcsn && !BER_BVISNULL( &ss->ss_ctxcsn[0] )) {
2444                         slap_compose_sync_cookie( op, &cookie, ss->ss_ctxcsn,
2445                                 srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2446
2447                         Debug( LDAP_DEBUG_SYNC, "syncprov_search_response: cookie=%s\n", cookie.bv_val, 0, 0 );
2448                 }
2449
2450                 /* Is this a regular refresh?
2451                  * Note: refresh never gets here if there were no changes
2452                  */
2453                 if ( !ss->ss_so ) {
2454                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2455                                 op->o_tmpmemctx );
2456                         rs->sr_ctrls[1] = NULL;
2457                         rs->sr_flags |= REP_CTRLS_MUSTBEFREED;
2458                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
2459                                 0, 1, &cookie, ( ss->ss_flags & SS_PRESENT ) ?  LDAP_SYNC_REFRESH_PRESENTS :
2460                                         LDAP_SYNC_REFRESH_DELETES );
2461                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2462                 } else {
2463                 /* It's RefreshAndPersist, transition to Persist phase */
2464                         syncprov_sendinfo( op, rs, ( ss->ss_flags & SS_PRESENT ) ?
2465                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
2466                                 ( ss->ss_flags & SS_CHANGED ) ? &cookie : NULL,
2467                                 1, NULL, 0 );
2468                         if ( !BER_BVISNULL( &cookie ))
2469                                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2470
2471                         /* Detach this Op from frontend control */
2472                         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
2473
2474                         /* But not if this connection was closed along the way */
2475                         if ( op->o_abandon ) {
2476                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2477                                 /* syncprov_ab_cleanup will free this syncop */
2478                                 return SLAPD_ABANDON;
2479
2480                         } else {
2481                                 ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
2482                                 /* Turn off the refreshing flag */
2483                                 ss->ss_so->s_flags ^= PS_IS_REFRESHING;
2484
2485                                 syncprov_detach_op( op, ss->ss_so, on );
2486
2487                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2488
2489                                 /* If there are queued responses, fire them off */
2490                                 if ( ss->ss_so->s_res )
2491                                         syncprov_qstart( ss->ss_so );
2492                                 ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
2493                         }
2494
2495                         return LDAP_SUCCESS;
2496                 }
2497         }
2498
2499         return SLAP_CB_CONTINUE;
2500 }
2501
2502 static int
2503 syncprov_op_search( Operation *op, SlapReply *rs )
2504 {
2505         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2506         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2507         slap_callback   *cb;
2508         int gotstate = 0, changed = 0, do_present = 0;
2509         syncops *sop = NULL;
2510         searchstate *ss;
2511         sync_control *srs;
2512         BerVarray ctxcsn;
2513         int i, *sids, numcsns;
2514         struct berval mincsn, maxcsn;
2515         int minsid, maxsid;
2516         int dirty = 0;
2517
2518         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
2519
2520         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
2521                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
2522                 return rs->sr_err;
2523         }
2524
2525         srs = op->o_controls[slap_cids.sc_LDAPsync];
2526
2527         /* If this is a persistent search, set it up right away */
2528         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
2529                 syncops so = {0};
2530                 fbase_cookie fc;
2531                 opcookie opc;
2532                 slap_callback sc = {0};
2533
2534                 fc.fss = &so;
2535                 fc.fbase = 0;
2536                 so.s_eid = NOID;
2537                 so.s_op = op;
2538                 so.s_flags = PS_IS_REFRESHING | PS_FIND_BASE;
2539                 /* syncprov_findbase expects to be called as a callback... */
2540                 sc.sc_private = &opc;
2541                 opc.son = on;
2542                 ldap_pvt_thread_mutex_init( &so.s_mutex );
2543                 cb = op->o_callback;
2544                 op->o_callback = &sc;
2545                 rs->sr_err = syncprov_findbase( op, &fc );
2546                 op->o_callback = cb;
2547                 ldap_pvt_thread_mutex_destroy( &so.s_mutex );
2548
2549                 if ( rs->sr_err != LDAP_SUCCESS ) {
2550                         send_ldap_result( op, rs );
2551                         return rs->sr_err;
2552                 }
2553                 sop = ch_malloc( sizeof( syncops ));
2554                 *sop = so;
2555                 sop->s_rid = srs->sr_state.rid;
2556                 sop->s_sid = srs->sr_state.sid;
2557                 /* set refcount=2 to prevent being freed out from under us
2558                  * by abandons that occur while we're running here
2559                  */
2560                 sop->s_inuse = 2;
2561
2562                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2563                 while ( si->si_active ) {
2564                         /* Wait for active mods to finish before proceeding, as they
2565                          * may already have inspected the si_ops list looking for
2566                          * consumers to replicate the change to.  Using the log
2567                          * doesn't help, as we may finish playing it before the
2568                          * active mods gets added to it.
2569                          */
2570                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2571                         if ( slapd_shutdown ) {
2572                                 ch_free( sop );
2573                                 return SLAPD_ABANDON;
2574                         }
2575                         if ( !ldap_pvt_thread_pool_pausecheck( &connection_pool ))
2576                                 ldap_pvt_thread_yield();
2577                         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2578                 }
2579                 if ( op->o_abandon ) {
2580                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2581                         ch_free( sop );
2582                         return SLAPD_ABANDON;
2583                 }
2584                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
2585                 sop->s_next = si->si_ops;
2586                 sop->s_si = si;
2587                 si->si_ops = sop;
2588                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2589         }
2590
2591         /* snapshot the ctxcsn
2592          * Note: this must not be done before the psearch setup. (ITS#8365)
2593          */
2594         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2595         numcsns = si->si_numcsns;
2596         if ( numcsns ) {
2597                 ber_bvarray_dup_x( &ctxcsn, si->si_ctxcsn, op->o_tmpmemctx );
2598                 sids = op->o_tmpalloc( numcsns * sizeof(int), op->o_tmpmemctx );
2599                 for ( i=0; i<numcsns; i++ )
2600                         sids[i] = si->si_sids[i];
2601         } else {
2602                 ctxcsn = NULL;
2603                 sids = NULL;
2604         }
2605         dirty = si->si_dirty;
2606         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2607
2608         /* If we have a cookie, handle the PRESENT lookups */
2609         if ( srs->sr_state.ctxcsn ) {
2610                 sessionlog *sl;
2611                 int i, j;
2612
2613                 /* If we don't have any CSN of our own yet, bail out.
2614                  */
2615                 if ( !numcsns ) {
2616                         rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
2617                         rs->sr_text = "consumer has state info but provider doesn't!";
2618                         goto bailout;
2619                 }
2620
2621                 if ( !si->si_nopres )
2622                         do_present = SS_PRESENT;
2623
2624                 /* If there are SIDs we don't recognize in the cookie, drop them */
2625                 for (i=0; i<srs->sr_state.numcsns; ) {
2626                         for (j=i; j<numcsns; j++) {
2627                                 if ( srs->sr_state.sids[i] <= sids[j] ) {
2628                                         break;
2629                                 }
2630                         }
2631                         /* not found */
2632                         if ( j == numcsns || srs->sr_state.sids[i] != sids[j] ) {
2633                                 char *tmp = srs->sr_state.ctxcsn[i].bv_val;
2634                                 srs->sr_state.numcsns--;
2635                                 for ( j=i; j<srs->sr_state.numcsns; j++ ) {
2636                                         srs->sr_state.ctxcsn[j] = srs->sr_state.ctxcsn[j+1];
2637                                         srs->sr_state.sids[j] = srs->sr_state.sids[j+1];
2638                                 }
2639                                 srs->sr_state.ctxcsn[j].bv_val = tmp;
2640                                 srs->sr_state.ctxcsn[j].bv_len = 0;
2641                                 continue;
2642                         }
2643                         i++;
2644                 }
2645
2646                 if (srs->sr_state.numcsns != numcsns) {
2647                         /* consumer doesn't have the right number of CSNs */
2648                         changed = SS_CHANGED;
2649                         if ( srs->sr_state.ctxcsn ) {
2650                                 ber_bvarray_free_x( srs->sr_state.ctxcsn, op->o_tmpmemctx );
2651                                 srs->sr_state.ctxcsn = NULL;
2652                         }
2653                         if ( srs->sr_state.sids ) {
2654                                 slap_sl_free( srs->sr_state.sids, op->o_tmpmemctx );
2655                                 srs->sr_state.sids = NULL;
2656                         }
2657                         srs->sr_state.numcsns = 0;
2658                         goto shortcut;
2659                 }
2660
2661                 /* Find the smallest CSN which differs from contextCSN */
2662                 mincsn.bv_len = 0;
2663                 maxcsn.bv_len = 0;
2664                 for ( i=0,j=0; i<srs->sr_state.numcsns; i++ ) {
2665                         int newer;
2666                         while ( srs->sr_state.sids[i] != sids[j] ) j++;
2667                         if ( BER_BVISEMPTY( &maxcsn ) || ber_bvcmp( &maxcsn,
2668                                 &srs->sr_state.ctxcsn[i] ) < 0 ) {
2669                                 maxcsn = srs->sr_state.ctxcsn[i];
2670                                 maxsid = sids[j];
2671                         }
2672                         newer = ber_bvcmp( &srs->sr_state.ctxcsn[i], &ctxcsn[j] );
2673                         /* If our state is newer, tell consumer about changes */
2674                         if ( newer < 0) {
2675                                 changed = SS_CHANGED;
2676                                 if ( BER_BVISEMPTY( &mincsn ) || ber_bvcmp( &mincsn,
2677                                         &srs->sr_state.ctxcsn[i] ) > 0 ) {
2678                                         mincsn = srs->sr_state.ctxcsn[i];
2679                                         minsid = sids[j];
2680                                 }
2681                         } else if ( newer > 0 && sids[j] == slap_serverID ) {
2682                         /* our state is older, complain to consumer */
2683                                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
2684                                 rs->sr_text = "consumer state is newer than provider!";
2685 bailout:
2686                                 if ( sop ) {
2687                                         syncops **sp = &si->si_ops;
2688
2689                                         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2690                                         while ( *sp != sop )
2691                                                 sp = &(*sp)->s_next;
2692                                         *sp = sop->s_next;
2693                                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2694                                         ch_free( sop );
2695                                 }
2696                                 rs->sr_ctrls = NULL;
2697                                 send_ldap_result( op, rs );
2698                                 return rs->sr_err;
2699                         }
2700                 }
2701                 if ( BER_BVISEMPTY( &mincsn )) {
2702                         mincsn = maxcsn;
2703                         minsid = maxsid;
2704                 }
2705
2706                 /* If nothing has changed, shortcut it */
2707                 if ( !changed && !dirty ) {
2708                         do_present = 0;
2709 no_change:      if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
2710                                 LDAPControl     *ctrls[2];
2711
2712                                 ctrls[0] = NULL;
2713                                 ctrls[1] = NULL;
2714                                 syncprov_done_ctrl( op, rs, ctrls, 0, 0,
2715                                         NULL, LDAP_SYNC_REFRESH_DELETES );
2716                                 rs->sr_ctrls = ctrls;
2717                                 rs->sr_err = LDAP_SUCCESS;
2718                                 send_ldap_result( op, rs );
2719                                 rs->sr_ctrls = NULL;
2720                                 return rs->sr_err;
2721                         }
2722                         goto shortcut;
2723                 }
2724
2725                 /* Do we have a sessionlog for this search? */
2726                 sl=si->si_logs;
2727                 if ( sl ) {
2728                         int do_play = 0;
2729                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
2730                         /* Are there any log entries, and is the consumer state
2731                          * present in the session log?
2732                          */
2733                         if ( sl->sl_num > 0 ) {
2734                                 int i;
2735                                 for ( i=0; i<sl->sl_numcsns; i++ ) {
2736                                         /* SID not present == new enough */
2737                                         if ( minsid < sl->sl_sids[i] ) {
2738                                                 do_play = 1;
2739                                                 break;
2740                                         }
2741                                         /* SID present */
2742                                         if ( minsid == sl->sl_sids[i] ) {
2743                                                 /* new enough? */
2744                                                 if ( ber_bvcmp( &mincsn, &sl->sl_mincsn[i] ) >= 0 )
2745                                                         do_play = 1;
2746                                                 break;
2747                                         }
2748                                 }
2749                                 /* SID not present == new enough */
2750                                 if ( i == sl->sl_numcsns )
2751                                         do_play = 1;
2752                         }
2753                         if ( do_play ) {
2754                                 do_present = 0;
2755                                 /* mutex is unlocked in playlog */
2756                                 syncprov_playlog( op, rs, sl, srs, ctxcsn, numcsns, sids );
2757                         } else {
2758                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
2759                         }
2760                 }
2761                 /* Is the CSN still present in the database? */
2762                 if ( syncprov_findcsn( op, FIND_CSN, &mincsn ) != LDAP_SUCCESS ) {
2763                         /* No, so a reload is required */
2764                         /* the 2.2 consumer doesn't send this hint */
2765                         if ( si->si_usehint && srs->sr_rhint == 0 ) {
2766                                 if ( ctxcsn )
2767                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2768                                 if ( sids )
2769                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2770                                 rs->sr_err = LDAP_SYNC_REFRESH_REQUIRED;
2771                                 rs->sr_text = "sync cookie is stale";
2772                                 goto bailout;
2773                         }
2774                         if ( srs->sr_state.ctxcsn ) {
2775                                 ber_bvarray_free_x( srs->sr_state.ctxcsn, op->o_tmpmemctx );
2776                                 srs->sr_state.ctxcsn = NULL;
2777                         }
2778                         if ( srs->sr_state.sids ) {
2779                                 slap_sl_free( srs->sr_state.sids, op->o_tmpmemctx );
2780                                 srs->sr_state.sids = NULL;
2781                         }
2782                         srs->sr_state.numcsns = 0;
2783                 } else {
2784                         gotstate = 1;
2785                         /* If changed and doing Present lookup, send Present UUIDs */
2786                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT, 0 ) !=
2787                                 LDAP_SUCCESS ) {
2788                                 if ( ctxcsn )
2789                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2790                                 if ( sids )
2791                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2792                                 goto bailout;
2793                         }
2794                 }
2795         } else {
2796                 /* The consumer knows nothing, we know nothing. OK. */
2797                 if (!numcsns)
2798                         goto no_change;
2799                 /* No consumer state, assume something has changed */
2800                 changed = SS_CHANGED;
2801         }
2802
2803 shortcut:
2804         /* Append CSN range to search filter, save original filter
2805          * for persistent search evaluation
2806          */
2807         if ( sop ) {
2808                 ldap_pvt_thread_mutex_lock( &sop->s_mutex );
2809                 sop->s_filterstr = op->ors_filterstr;
2810                 /* correct the refcount that was set to 2 before */
2811                 sop->s_inuse--;
2812         }
2813
2814         /* If something changed, find the changes */
2815         if ( gotstate && ( changed || dirty ) ) {
2816                 Filter *fand, *fava;
2817
2818                 fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2819                 fand->f_choice = LDAP_FILTER_AND;
2820                 fand->f_next = NULL;
2821                 fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2822                 fand->f_and = fava;
2823                 fava->f_choice = LDAP_FILTER_GE;
2824                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
2825                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
2826 #ifdef LDAP_COMP_MATCH
2827                 fava->f_ava->aa_cf = NULL;
2828 #endif
2829                 ber_dupbv_x( &fava->f_ava->aa_value, &mincsn, op->o_tmpmemctx );
2830                 fava->f_next = op->ors_filter;
2831                 op->ors_filter = fand;
2832                 filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
2833                 if ( sop ) {
2834                         sop->s_flags |= PS_FIX_FILTER;
2835                 }
2836         }
2837         if ( sop ) {
2838                 ldap_pvt_thread_mutex_unlock( &sop->s_mutex );
2839         }
2840
2841         /* Let our callback add needed info to returned entries */
2842         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
2843         ss = (searchstate *)(cb+1);
2844         ss->ss_on = on;
2845         ss->ss_so = sop;
2846         ss->ss_flags = do_present | changed;
2847         ss->ss_ctxcsn = ctxcsn;
2848         ss->ss_numcsns = numcsns;
2849         ss->ss_sids = sids;
2850         cb->sc_response = syncprov_search_response;
2851         cb->sc_private = ss;
2852         cb->sc_next = op->o_callback;
2853         op->o_callback = cb;
2854
2855         /* If this is a persistent search and no changes were reported during
2856          * the refresh phase, just invoke the response callback to transition
2857          * us into persist phase
2858          */
2859         if ( !changed && !dirty ) {
2860                 rs->sr_err = LDAP_SUCCESS;
2861                 rs->sr_nentries = 0;
2862                 send_ldap_result( op, rs );
2863                 return rs->sr_err;
2864         }
2865         return SLAP_CB_CONTINUE;
2866 }
2867
2868 static int
2869 syncprov_operational(
2870         Operation *op,
2871         SlapReply *rs )
2872 {
2873         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2874         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2875
2876         /* This prevents generating unnecessarily; frontend will strip
2877          * any statically stored copy.
2878          */
2879         if ( op->o_sync != SLAP_CONTROL_NONE )
2880                 return SLAP_CB_CONTINUE;
2881
2882         if ( rs->sr_entry &&
2883                 dn_match( &rs->sr_entry->e_nname, &si->si_contextdn )) {
2884
2885                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
2886                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
2887                         Attribute *a, **ap = NULL;
2888
2889                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
2890                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
2891                                         break;
2892                         }
2893
2894                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2895                         if ( si->si_ctxcsn ) {
2896                                 if ( !a ) {
2897                                         for ( ap = &rs->sr_operational_attrs; *ap;
2898                                                 ap=&(*ap)->a_next );
2899
2900                                         a = attr_alloc( slap_schema.si_ad_contextCSN );
2901                                         *ap = a;
2902                                 }
2903
2904                                 if ( !ap ) {
2905                                         if ( rs_entry2modifiable( op, rs, on )) {
2906                                                 a = attr_find( rs->sr_entry->e_attrs,
2907                                                         slap_schema.si_ad_contextCSN );
2908                                         }
2909                                         if ( a->a_nvals != a->a_vals ) {
2910                                                 ber_bvarray_free( a->a_nvals );
2911                                         }
2912                                         a->a_nvals = NULL;
2913                                         ber_bvarray_free( a->a_vals );
2914                                         a->a_vals = NULL;
2915                                         a->a_numvals = 0;
2916                                 }
2917                                 attr_valadd( a, si->si_ctxcsn, si->si_ctxcsn, si->si_numcsns );
2918                         }
2919                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2920                 }
2921         }
2922         return SLAP_CB_CONTINUE;
2923 }
2924
2925 enum {
2926         SP_CHKPT = 1,
2927         SP_SESSL,
2928         SP_NOPRES,
2929         SP_USEHINT
2930 };
2931
2932 static ConfigDriver sp_cf_gen;
2933
2934 static ConfigTable spcfg[] = {
2935         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2936                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2937                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2938                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2939         { "syncprov-sessionlog", "ops", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2940                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2941                         "DESC 'Session log size in ops' "
2942                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2943         { "syncprov-nopresent", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_NOPRES,
2944                 sp_cf_gen, "( OLcfgOvAt:1.3 NAME 'olcSpNoPresent' "
2945                         "DESC 'Omit Present phase processing' "
2946                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2947         { "syncprov-reloadhint", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_USEHINT,
2948                 sp_cf_gen, "( OLcfgOvAt:1.4 NAME 'olcSpReloadHint' "
2949                         "DESC 'Observe Reload Hint in Request control' "
2950                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2951         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2952 };
2953
2954 static ConfigOCs spocs[] = {
2955         { "( OLcfgOvOc:1.1 "
2956                 "NAME 'olcSyncProvConfig' "
2957                 "DESC 'SyncRepl Provider configuration' "
2958                 "SUP olcOverlayConfig "
2959                 "MAY ( olcSpCheckpoint "
2960                         "$ olcSpSessionlog "
2961                         "$ olcSpNoPresent "
2962                         "$ olcSpReloadHint "
2963                 ") )",
2964                         Cft_Overlay, spcfg },
2965         { NULL, 0, NULL }
2966 };
2967
2968 static int
2969 sp_cf_gen(ConfigArgs *c)
2970 {
2971         slap_overinst           *on = (slap_overinst *)c->bi;
2972         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2973         int rc = 0;
2974
2975         if ( c->op == SLAP_CONFIG_EMIT ) {
2976                 switch ( c->type ) {
2977                 case SP_CHKPT:
2978                         if ( si->si_chkops || si->si_chktime ) {
2979                                 struct berval bv;
2980                                 /* we assume si_chktime is a multiple of 60
2981                                  * because the parsed value was originally
2982                                  * multiplied by 60 */
2983                                 bv.bv_len = snprintf( c->cr_msg, sizeof( c->cr_msg ),
2984                                         "%d %d", si->si_chkops, si->si_chktime/60 );
2985                                 if ( bv.bv_len >= sizeof( c->cr_msg ) ) {
2986                                         rc = 1;
2987                                 } else {
2988                                         bv.bv_val = c->cr_msg;
2989                                         value_add_one( &c->rvalue_vals, &bv );
2990                                 }
2991                         } else {
2992                                 rc = 1;
2993                         }
2994                         break;
2995                 case SP_SESSL:
2996                         if ( si->si_logs ) {
2997                                 c->value_int = si->si_logs->sl_size;
2998                         } else {
2999                                 rc = 1;
3000                         }
3001                         break;
3002                 case SP_NOPRES:
3003                         if ( si->si_nopres ) {
3004                                 c->value_int = 1;
3005                         } else {
3006                                 rc = 1;
3007                         }
3008                         break;
3009                 case SP_USEHINT:
3010                         if ( si->si_usehint ) {
3011                                 c->value_int = 1;
3012                         } else {
3013                                 rc = 1;
3014                         }
3015                         break;
3016                 }
3017                 return rc;
3018         } else if ( c->op == LDAP_MOD_DELETE ) {
3019                 switch ( c->type ) {
3020                 case SP_CHKPT:
3021                         si->si_chkops = 0;
3022                         si->si_chktime = 0;
3023                         break;
3024                 case SP_SESSL:
3025                         if ( si->si_logs )
3026                                 si->si_logs->sl_size = 0;
3027                         else
3028                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
3029                         break;
3030                 case SP_NOPRES:
3031                         if ( si->si_nopres )
3032                                 si->si_nopres = 0;
3033                         else
3034                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
3035                         break;
3036                 case SP_USEHINT:
3037                         if ( si->si_usehint )
3038                                 si->si_usehint = 0;
3039                         else
3040                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
3041                         break;
3042                 }
3043                 return rc;
3044         }
3045         switch ( c->type ) {
3046         case SP_CHKPT:
3047                 if ( lutil_atoi( &si->si_chkops, c->argv[1] ) != 0 ) {
3048                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint ops # \"%s\"",
3049                                 c->argv[0], c->argv[1] );
3050                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
3051                                 "%s: %s\n", c->log, c->cr_msg, 0 );
3052                         return ARG_BAD_CONF;
3053                 }
3054                 if ( si->si_chkops <= 0 ) {
3055                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint ops # \"%d\"",
3056                                 c->argv[0], si->si_chkops );
3057                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
3058                                 "%s: %s\n", c->log, c->cr_msg, 0 );
3059                         return ARG_BAD_CONF;
3060                 }
3061                 if ( lutil_atoi( &si->si_chktime, c->argv[2] ) != 0 ) {
3062                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint time \"%s\"",
3063                                 c->argv[0], c->argv[1] );
3064                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
3065                                 "%s: %s\n", c->log, c->cr_msg, 0 );
3066                         return ARG_BAD_CONF;
3067                 }
3068                 if ( si->si_chktime <= 0 ) {
3069                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint time \"%d\"",
3070                                 c->argv[0], si->si_chkops );
3071                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
3072                                 "%s: %s\n", c->log, c->cr_msg, 0 );
3073                         return ARG_BAD_CONF;
3074                 }
3075                 si->si_chktime *= 60;
3076                 break;
3077         case SP_SESSL: {
3078                 sessionlog *sl;
3079                 int size = c->value_int;
3080
3081                 if ( size < 0 ) {
3082                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s size %d is negative",
3083                                 c->argv[0], size );
3084                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
3085                                 "%s: %s\n", c->log, c->cr_msg, 0 );
3086                         return ARG_BAD_CONF;
3087                 }
3088                 sl = si->si_logs;
3089                 if ( !sl ) {
3090                         sl = ch_malloc( sizeof( sessionlog ));
3091                         sl->sl_mincsn = NULL;
3092                         sl->sl_sids = NULL;
3093                         sl->sl_num = 0;
3094                         sl->sl_numcsns = 0;
3095                         sl->sl_head = sl->sl_tail = NULL;
3096                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
3097                         si->si_logs = sl;
3098                 }
3099                 sl->sl_size = size;
3100                 }
3101                 break;
3102         case SP_NOPRES:
3103                 si->si_nopres = c->value_int;
3104                 break;
3105         case SP_USEHINT:
3106                 si->si_usehint = c->value_int;
3107                 break;
3108         }
3109         return rc;
3110 }
3111
3112 /* ITS#3456 we cannot run this search on the main thread, must use a
3113  * child thread in order to insure we have a big enough stack.
3114  */
3115 static void *
3116 syncprov_db_otask(
3117         void *ptr
3118 )
3119 {
3120         syncprov_findcsn( ptr, FIND_MAXCSN, 0 );
3121         return NULL;
3122 }
3123
3124
3125 /* Read any existing contextCSN from the underlying db.
3126  * Then search for any entries newer than that. If no value exists,
3127  * just generate it. Cache whatever result.
3128  */
3129 static int
3130 syncprov_db_open(
3131         BackendDB *be,
3132         ConfigReply *cr
3133 )
3134 {
3135         slap_overinst   *on = (slap_overinst *) be->bd_info;
3136         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3137
3138         Connection conn = { 0 };
3139         OperationBuffer opbuf;
3140         Operation *op;
3141         Entry *e = NULL;
3142         Attribute *a;
3143         int rc;
3144         void *thrctx = NULL;
3145
3146         if ( !SLAP_LASTMOD( be )) {
3147                 Debug( LDAP_DEBUG_ANY,
3148                         "syncprov_db_open: invalid config, lastmod must be enabled\n", 0, 0, 0 );
3149                 return -1;
3150         }
3151
3152         if ( slapMode & SLAP_TOOL_MODE ) {
3153                 return 0;
3154         }
3155
3156         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
3157         if ( rc ) {
3158                 return rc;
3159         }
3160
3161         thrctx = ldap_pvt_thread_pool_context();
3162         connection_fake_init2( &conn, &opbuf, thrctx, 0 );
3163         op = &opbuf.ob_op;
3164         op->o_bd = be;
3165         op->o_dn = be->be_rootdn;
3166         op->o_ndn = be->be_rootndn;
3167
3168         if ( SLAP_SYNC_SUBENTRY( be )) {
3169                 build_new_dn( &si->si_contextdn, be->be_nsuffix,
3170                         (struct berval *)&slap_ldapsync_cn_bv, NULL );
3171         } else {
3172                 si->si_contextdn = be->be_nsuffix[0];
3173         }
3174         rc = overlay_entry_get_ov( op, &si->si_contextdn, NULL,
3175                 slap_schema.si_ad_contextCSN, 0, &e, on );
3176
3177         if ( e ) {
3178                 ldap_pvt_thread_t tid;
3179
3180                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
3181                 if ( a ) {
3182                         ber_bvarray_dup_x( &si->si_ctxcsn, a->a_vals, NULL );
3183                         si->si_numcsns = a->a_numvals;
3184                         si->si_sids = slap_parse_csn_sids( si->si_ctxcsn, a->a_numvals, NULL );
3185                         slap_sort_csn_sids( si->si_ctxcsn, si->si_sids, si->si_numcsns, NULL );
3186                 }
3187                 overlay_entry_release_ov( op, e, 0, on );
3188                 if ( si->si_ctxcsn && !SLAP_DBCLEAN( be )) {
3189                         op->o_tag = LDAP_REQ_SEARCH;
3190                         op->o_req_dn = be->be_suffix[0];
3191                         op->o_req_ndn = be->be_nsuffix[0];
3192                         op->ors_scope = LDAP_SCOPE_SUBTREE;
3193                         ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
3194                         ldap_pvt_thread_join( tid, NULL );
3195                 }
3196         }
3197
3198         /* Didn't find a contextCSN, should we generate one? */
3199         if ( !si->si_ctxcsn ) {
3200                 char csnbuf[ LDAP_PVT_CSNSTR_BUFSIZE ];
3201                 struct berval csn;
3202
3203                 if ( slap_serverID || SLAP_SYNC_SHADOW( op->o_bd )) {
3204                 /* If we're also a consumer, then don't generate anything.
3205                  * Wait for our provider to send it to us, or for a local
3206                  * modify if we have multimaster.
3207                  */
3208                         goto out;
3209                 }
3210                 csn.bv_val = csnbuf;
3211                 csn.bv_len = sizeof( csnbuf );
3212                 slap_get_csn( op, &csn, 0 );
3213                 value_add_one( &si->si_ctxcsn, &csn );
3214                 si->si_numcsns = 1;
3215                 si->si_sids = ch_malloc( sizeof(int) );
3216                 si->si_sids[0] = slap_serverID;
3217
3218                 /* make sure we do a checkpoint on close */
3219                 si->si_numops++;
3220         }
3221
3222         /* Initialize the sessionlog mincsn */
3223         if ( si->si_logs && si->si_numcsns ) {
3224                 sessionlog *sl = si->si_logs;
3225                 int i;
3226                 ber_bvarray_dup_x( &sl->sl_mincsn, si->si_ctxcsn, NULL );
3227                 sl->sl_numcsns = si->si_numcsns;
3228                 sl->sl_sids = ch_malloc( si->si_numcsns * sizeof(int) );
3229                 for ( i=0; i < si->si_numcsns; i++ )
3230                         sl->sl_sids[i] = si->si_sids[i];
3231         }
3232
3233 out:
3234         op->o_bd->bd_info = (BackendInfo *)on;
3235         return 0;
3236 }
3237
3238 /* Write the current contextCSN into the underlying db.
3239  */
3240 static int
3241 syncprov_db_close(
3242         BackendDB *be,
3243         ConfigReply *cr
3244 )
3245 {
3246     slap_overinst   *on = (slap_overinst *) be->bd_info;
3247     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3248 #ifdef SLAP_CONFIG_DELETE
3249         syncops *so, *sonext;
3250 #endif /* SLAP_CONFIG_DELETE */
3251
3252         if ( slapMode & SLAP_TOOL_MODE ) {
3253                 return 0;
3254         }
3255         if ( si->si_numops ) {
3256                 Connection conn = {0};
3257                 OperationBuffer opbuf;
3258                 Operation *op;
3259                 void *thrctx;
3260
3261                 thrctx = ldap_pvt_thread_pool_context();
3262                 connection_fake_init2( &conn, &opbuf, thrctx, 0 );
3263                 op = &opbuf.ob_op;
3264                 op->o_bd = be;
3265                 op->o_dn = be->be_rootdn;
3266                 op->o_ndn = be->be_rootndn;
3267                 syncprov_checkpoint( op, on );
3268         }
3269
3270 #ifdef SLAP_CONFIG_DELETE
3271         if ( !slapd_shutdown ) {
3272                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
3273                 for ( so=si->si_ops, sonext=so;  so; so=sonext  ) {
3274                         SlapReply rs = {REP_RESULT};
3275                         rs.sr_err = LDAP_UNAVAILABLE;
3276                         send_ldap_result( so->s_op, &rs );
3277                         sonext=so->s_next;
3278                         syncprov_drop_psearch( so, 0);
3279                 }
3280                 si->si_ops=NULL;
3281                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
3282         }
3283         overlay_unregister_control( be, LDAP_CONTROL_SYNC );
3284 #endif /* SLAP_CONFIG_DELETE */
3285
3286     return 0;
3287 }
3288
3289 static int
3290 syncprov_db_init(
3291         BackendDB *be,
3292         ConfigReply *cr
3293 )
3294 {
3295         slap_overinst   *on = (slap_overinst *)be->bd_info;
3296         syncprov_info_t *si;
3297
3298         if ( SLAP_ISGLOBALOVERLAY( be ) ) {
3299                 Debug( LDAP_DEBUG_ANY,
3300                         "syncprov must be instantiated within a database.\n",
3301                         0, 0, 0 );
3302                 return 1;
3303         }
3304
3305         si = ch_calloc(1, sizeof(syncprov_info_t));
3306         on->on_bi.bi_private = si;
3307         ldap_pvt_thread_rdwr_init( &si->si_csn_rwlock );
3308         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
3309         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
3310         ldap_pvt_thread_mutex_init( &si->si_resp_mutex );
3311
3312         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
3313         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
3314         csn_anlist[1].an_desc = slap_schema.si_ad_entryUUID;
3315         csn_anlist[1].an_name = slap_schema.si_ad_entryUUID->ad_cname;
3316
3317         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
3318         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
3319
3320         return 0;
3321 }
3322
3323 static int
3324 syncprov_db_destroy(
3325         BackendDB *be,
3326         ConfigReply *cr
3327 )
3328 {
3329         slap_overinst   *on = (slap_overinst *)be->bd_info;
3330         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3331
3332         if ( si ) {
3333                 if ( si->si_logs ) {
3334                         sessionlog *sl = si->si_logs;
3335                         slog_entry *se = sl->sl_head;
3336
3337                         while ( se ) {
3338                                 slog_entry *se_next = se->se_next;
3339                                 ch_free( se );
3340                                 se = se_next;
3341                         }
3342                         if ( sl->sl_mincsn )
3343                                 ber_bvarray_free( sl->sl_mincsn );
3344                         if ( sl->sl_sids )
3345                                 ch_free( sl->sl_sids );
3346
3347                         ldap_pvt_thread_mutex_destroy(&si->si_logs->sl_mutex);
3348                         ch_free( si->si_logs );
3349                 }
3350                 if ( si->si_ctxcsn )
3351                         ber_bvarray_free( si->si_ctxcsn );
3352                 if ( si->si_sids )
3353                         ch_free( si->si_sids );
3354                 ldap_pvt_thread_mutex_destroy( &si->si_resp_mutex );
3355                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
3356                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
3357                 ldap_pvt_thread_rdwr_destroy( &si->si_csn_rwlock );
3358                 ch_free( si );
3359         }
3360
3361         return 0;
3362 }
3363
3364 static int syncprov_parseCtrl (
3365         Operation *op,
3366         SlapReply *rs,
3367         LDAPControl *ctrl )
3368 {
3369         ber_tag_t tag;
3370         BerElementBuffer berbuf;
3371         BerElement *ber = (BerElement *)&berbuf;
3372         ber_int_t mode;
3373         ber_len_t len;
3374         struct berval cookie = BER_BVNULL;
3375         sync_control *sr;
3376         int rhint = 0;
3377
3378         if ( op->o_sync != SLAP_CONTROL_NONE ) {
3379                 rs->sr_text = "Sync control specified multiple times";
3380                 return LDAP_PROTOCOL_ERROR;
3381         }
3382
3383         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
3384                 rs->sr_text = "Sync control specified with pagedResults control";
3385                 return LDAP_PROTOCOL_ERROR;
3386         }
3387
3388         if ( BER_BVISNULL( &ctrl->ldctl_value ) ) {
3389                 rs->sr_text = "Sync control value is absent";
3390                 return LDAP_PROTOCOL_ERROR;
3391         }
3392
3393         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
3394                 rs->sr_text = "Sync control value is empty";
3395                 return LDAP_PROTOCOL_ERROR;
3396         }
3397
3398         /* Parse the control value
3399          *      syncRequestValue ::= SEQUENCE {
3400          *              mode   ENUMERATED {
3401          *                      -- 0 unused
3402          *                      refreshOnly             (1),
3403          *                      -- 2 reserved
3404          *                      refreshAndPersist       (3)
3405          *              },
3406          *              cookie  syncCookie OPTIONAL
3407          *      }
3408          */
3409
3410         ber_init2( ber, &ctrl->ldctl_value, 0 );
3411
3412         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
3413                 rs->sr_text = "Sync control : mode decoding error";
3414                 return LDAP_PROTOCOL_ERROR;
3415         }
3416
3417         switch( mode ) {
3418         case LDAP_SYNC_REFRESH_ONLY:
3419                 mode = SLAP_SYNC_REFRESH;
3420                 break;
3421         case LDAP_SYNC_REFRESH_AND_PERSIST:
3422                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
3423                 break;
3424         default:
3425                 rs->sr_text = "Sync control : unknown update mode";
3426                 return LDAP_PROTOCOL_ERROR;
3427         }
3428
3429         tag = ber_peek_tag( ber, &len );
3430
3431         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
3432                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
3433                         rs->sr_text = "Sync control : cookie decoding error";
3434                         return LDAP_PROTOCOL_ERROR;
3435                 }
3436                 tag = ber_peek_tag( ber, &len );
3437         }
3438         if ( tag == LDAP_TAG_RELOAD_HINT ) {
3439                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
3440                         rs->sr_text = "Sync control : rhint decoding error";
3441                         return LDAP_PROTOCOL_ERROR;
3442                 }
3443         }
3444         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
3445                         rs->sr_text = "Sync control : decoding error";
3446                         return LDAP_PROTOCOL_ERROR;
3447         }
3448         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
3449         sr->sr_rhint = rhint;
3450         if (!BER_BVISNULL(&cookie)) {
3451                 ber_dupbv_x( &sr->sr_state.octet_str, &cookie, op->o_tmpmemctx );
3452                 /* If parse fails, pretend no cookie was sent */
3453                 if ( slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx ) ||
3454                         sr->sr_state.rid == -1 ) {
3455                         if ( sr->sr_state.ctxcsn ) {
3456                                 ber_bvarray_free_x( sr->sr_state.ctxcsn, op->o_tmpmemctx );
3457                                 sr->sr_state.ctxcsn = NULL;
3458                         }
3459                         sr->sr_state.numcsns = 0;
3460                 }
3461         }
3462
3463         op->o_controls[slap_cids.sc_LDAPsync] = sr;
3464
3465         op->o_sync = ctrl->ldctl_iscritical
3466                 ? SLAP_CONTROL_CRITICAL
3467                 : SLAP_CONTROL_NONCRITICAL;
3468
3469         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
3470
3471         return LDAP_SUCCESS;
3472 }
3473
3474 /* This overlay is set up for dynamic loading via moduleload. For static
3475  * configuration, you'll need to arrange for the slap_overinst to be
3476  * initialized and registered by some other function inside slapd.
3477  */
3478
3479 static slap_overinst            syncprov;
3480
3481 int
3482 syncprov_initialize()
3483 {
3484         int rc;
3485
3486         rc = register_supported_control( LDAP_CONTROL_SYNC,
3487                 SLAP_CTRL_SEARCH, NULL,
3488                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
3489         if ( rc != LDAP_SUCCESS ) {
3490                 Debug( LDAP_DEBUG_ANY,
3491                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
3492                 return rc;
3493         }
3494
3495         syncprov.on_bi.bi_type = "syncprov";
3496         syncprov.on_bi.bi_db_init = syncprov_db_init;
3497         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
3498         syncprov.on_bi.bi_db_open = syncprov_db_open;
3499         syncprov.on_bi.bi_db_close = syncprov_db_close;
3500
3501         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
3502         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
3503
3504         syncprov.on_bi.bi_op_add = syncprov_op_mod;
3505         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
3506         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
3507         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
3508         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
3509         syncprov.on_bi.bi_op_search = syncprov_op_search;
3510         syncprov.on_bi.bi_extended = syncprov_op_extended;
3511         syncprov.on_bi.bi_operational = syncprov_operational;
3512
3513         syncprov.on_bi.bi_cf_ocs = spocs;
3514
3515         generic_filter.f_desc = slap_schema.si_ad_objectClass;
3516
3517         rc = config_register_schema( spcfg, spocs );
3518         if ( rc ) return rc;
3519
3520         return overlay_register( &syncprov );
3521 }
3522
3523 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
3524 int
3525 init_module( int argc, char *argv[] )
3526 {
3527         return syncprov_initialize();
3528 }
3529 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
3530
3531 #endif /* defined(SLAPD_OVER_SYNCPROV) */