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 2004-2017 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         void *s_pool_cookie;
  93         ldap_pvt_thread_mutex_t s_mutex;
  94 } syncops;
  95
  96 /* A received sync control */
  97 typedef struct sync_control {
  98         struct sync_cookie sr_state;
  99         int sr_rhint;
 100 } sync_control;
 101
 102 #if 0 /* moved back to slap.h */
 103 #define o_sync  o_ctrlflag[slap_cids.sc_LDAPsync]
 104 #endif
 105 /* o_sync_mode uses data bits of o_sync */
 106 #define o_sync_mode     o_ctrlflag[slap_cids.sc_LDAPsync]
 107
 108 #define SLAP_SYNC_NONE                                  (LDAP_SYNC_NONE<<SLAP_CONTROL_SHIFT)
 109 #define SLAP_SYNC_REFRESH                               (LDAP_SYNC_REFRESH_ONLY<<SLAP_CONTROL_SHIFT)
 110 #define SLAP_SYNC_PERSIST                               (LDAP_SYNC_RESERVED<<SLAP_CONTROL_SHIFT)
 111 #define SLAP_SYNC_REFRESH_AND_PERSIST   (LDAP_SYNC_REFRESH_AND_PERSIST<<SLAP_CONTROL_SHIFT)
 112
 113 /* Record of which searches matched at premodify step */
 114 typedef struct syncmatches {
 115         struct syncmatches *sm_next;
 116         syncops *sm_op;
 117 } syncmatches;
 118
 119 /* Session log data */
 120 typedef struct slog_entry {
 121         struct slog_entry *se_next;
 122         struct berval se_uuid;
 123         struct berval se_csn;
 124         int     se_sid;
 125         ber_tag_t       se_tag;
 126 } slog_entry;
 127
 128 typedef struct sessionlog {
 129         BerVarray       sl_mincsn;
 130         int             *sl_sids;
 131         int             sl_numcsns;
 132         int             sl_num;
 133         int             sl_size;
 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 #define FS_UNLINK       1
 799 #define FS_LOCK         2
 800
 801 static int
 802 syncprov_free_syncop( syncops *so, int flags )
 803 {
 804         syncres *sr, *srnext;
 805         GroupAssertion *ga, *gnext;
 806
 807         if ( flags & FS_LOCK )
 808                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 809         /* already being freed, or still in use */
 810         if ( !so->s_inuse || --so->s_inuse > 0 ) {
 811                 if ( flags & FS_LOCK )
 812                         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 813                 return 0;
 814         }
 815         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 816         if (( flags & FS_UNLINK ) && so->s_si ) {
 817                 syncops **sop;
 818                 ldap_pvt_thread_mutex_lock( &so->s_si->si_ops_mutex );
 819                 for ( sop = &so->s_si->si_ops; *sop; sop = &(*sop)->s_next ) {
 820                         if ( *sop == so ) {
 821                                 *sop = so->s_next;
 822                                 break;
 823                         }
 824                 }
 825                 ldap_pvt_thread_mutex_unlock( &so->s_si->si_ops_mutex );
 826         }
 827         if ( so->s_flags & PS_IS_DETACHED ) {
 828                 filter_free( so->s_op->ors_filter );
 829                 for ( ga = so->s_op->o_groups; ga; ga=gnext ) {
 830                         gnext = ga->ga_next;
 831                         ch_free( ga );
 832                 }
 833                 ch_free( so->s_op );
 834         }
 835         ch_free( so->s_base.bv_val );
 836         for ( sr=so->s_res; sr; sr=srnext ) {
 837                 srnext = sr->s_next;
 838                 free_resinfo( sr );
 839                 ch_free( sr );
 840         }
 841         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 842         ch_free( so );
 843         return 1;
 844 }
 845
 846 /* Send a persistent search response */
 847 static int
 848 syncprov_sendresp( Operation *op, resinfo *ri, syncops *so, int mode )
 849 {
 850         SlapReply rs = { REP_SEARCH };
 851         struct berval cookie, csns[2];
 852         Entry e_uuid = {0};
 853         Attribute a_uuid = {0};
 854
 855         if ( so->s_op->o_abandon )
 856                 return SLAPD_ABANDON;
 857
 858         rs.sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2, op->o_tmpmemctx );
 859         rs.sr_ctrls[1] = NULL;
 860         rs.sr_flags = REP_CTRLS_MUSTBEFREED;
 861         csns[0] = ri->ri_csn;
 862         BER_BVZERO( &csns[1] );
 863         slap_compose_sync_cookie( op, &cookie, csns, so->s_rid, slap_serverID ? slap_serverID : -1 );
 864
 865 #ifdef LDAP_DEBUG
 866         if ( so->s_sid > 0 ) {
 867                 Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: to=%03x, cookie=%s\n",
 868                         so->s_sid, cookie.bv_val, 0 );
 869         } else {
 870                 Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: cookie=%s\n",
 871                         cookie.bv_val, 0, 0 );
 872         }
 873 #endif
 874
 875         e_uuid.e_attrs = &a_uuid;
 876         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 877         a_uuid.a_nvals = &ri->ri_uuid;
 878         rs.sr_err = syncprov_state_ctrl( op, &rs, &e_uuid,
 879                 mode, rs.sr_ctrls, 0, 1, &cookie );
 880         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
 881
 882         rs.sr_entry = &e_uuid;
 883         if ( mode == LDAP_SYNC_ADD || mode == LDAP_SYNC_MODIFY ) {
 884                 e_uuid = *ri->ri_e;
 885                 e_uuid.e_private = NULL;
 886         }
 887
 888         switch( mode ) {
 889         case LDAP_SYNC_ADD:
 890                 if ( ri->ri_isref && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 891                         rs.sr_ref = get_entry_referrals( op, rs.sr_entry );
 892                         rs.sr_err = send_search_reference( op, &rs );
 893                         ber_bvarray_free( rs.sr_ref );
 894                         break;
 895                 }
 896                 /* fallthru */
 897         case LDAP_SYNC_MODIFY:
 898                 rs.sr_attrs = op->ors_attrs;
 899                 rs.sr_err = send_search_entry( op, &rs );
 900                 break;
 901         case LDAP_SYNC_DELETE:
 902                 e_uuid.e_attrs = NULL;
 903                 e_uuid.e_name = ri->ri_dn;
 904                 e_uuid.e_nname = ri->ri_ndn;
 905                 if ( ri->ri_isref && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 906                         struct berval bv = BER_BVNULL;
 907                         rs.sr_ref = &bv;
 908                         rs.sr_err = send_search_reference( op, &rs );
 909                 } else {
 910                         rs.sr_err = send_search_entry( op, &rs );
 911                 }
 912                 break;
 913         default:
 914                 assert(0);
 915         }
 916         return rs.sr_err;
 917 }
 918
 919 static void
 920 syncprov_qstart( syncops *so );
 921
 922 /* Play back queued responses */
 923 static int
 924 syncprov_qplay( Operation *op, syncops *so )
 925 {
 926         syncres *sr;
 927         int rc = 0;
 928
 929         do {
 930                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 931                 sr = so->s_res;
 932                 /* Exit loop with mutex held */
 933                 if ( !sr )
 934                         break;
 935                 so->s_res = sr->s_next;
 936                 if ( !so->s_res )
 937                         so->s_restail = NULL;
 938                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 939
 940                 if ( !so->s_op->o_abandon ) {
 941
 942                         if ( sr->s_mode == LDAP_SYNC_NEW_COOKIE ) {
 943                                 SlapReply rs = { REP_INTERMEDIATE };
 944
 945                                 rc = syncprov_sendinfo( op, &rs, LDAP_TAG_SYNC_NEW_COOKIE,
 946                                         &sr->s_info->ri_cookie, 0, NULL, 0 );
 947                         } else {
 948                                 rc = syncprov_sendresp( op, sr->s_info, so, sr->s_mode );
 949                         }
 950                 }
 951
 952                 free_resinfo( sr );
 953                 ch_free( sr );
 954
 955                 if ( so->s_op->o_abandon )
 956                         continue;
 957
 958                 /* Exit loop with mutex held */
 959                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 960                 break;
 961
 962         } while (1);
 963
 964         /* We now only send one change at a time, to prevent one
 965          * psearch from hogging all the CPU. Resubmit this task if
 966          * there are more responses queued and no errors occurred.
 967          */
 968
 969         if ( rc == 0 && so->s_res ) {
 970                 syncprov_qstart( so );
 971         }
 972
 973         return rc;
 974 }
 975
 976 /* task for playing back queued responses */
 977 static void *
 978 syncprov_qtask( void *ctx, void *arg )
 979 {
 980         syncops *so = arg;
 981         OperationBuffer opbuf;
 982         Operation *op;
 983         BackendDB be;
 984         int rc;
 985
 986         op = &opbuf.ob_op;
 987         *op = *so->s_op;
 988         op->o_hdr = &opbuf.ob_hdr;
 989         op->o_controls = opbuf.ob_controls;
 990         memset( op->o_controls, 0, sizeof(opbuf.ob_controls) );
 991         op->o_sync = SLAP_CONTROL_IGNORED;
 992
 993         *op->o_hdr = *so->s_op->o_hdr;
 994
 995         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx, 1);
 996         op->o_tmpmfuncs = &slap_sl_mfuncs;
 997         op->o_threadctx = ctx;
 998
 999         /* syncprov_qplay expects a fake db */
1000         be = *so->s_op->o_bd;
1001         be.be_flags |= SLAP_DBFLAG_OVERLAY;
1002         op->o_bd = &be;
1003         LDAP_SLIST_FIRST(&op->o_extra) = NULL;
1004         op->o_callback = NULL;
1005
1006         rc = syncprov_qplay( op, so );
1007
1008         /* if an error occurred, or no responses left, task is no longer queued */
1009         if ( !rc && !so->s_res )
1010                 rc = 1;
1011
1012         /* decrement use count... */
1013         if ( !syncprov_free_syncop( so, FS_UNLINK )) {
1014                 if ( rc )
1015                         /* if we didn't unlink, and task is no longer queued, clear flag */
1016                         so->s_flags ^= PS_TASK_QUEUED;
1017                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
1018         }
1019
1020         return NULL;
1021 }
1022
1023 /* Start the task to play back queued psearch responses */
1024 static void
1025 syncprov_qstart( syncops *so )
1026 {
1027         so->s_flags |= PS_TASK_QUEUED;
1028         so->s_inuse++;
1029         ldap_pvt_thread_pool_submit2( &connection_pool,
1030                 syncprov_qtask, so, &so->s_pool_cookie );
1031 }
1032
1033 /* Queue a persistent search response */
1034 static int
1035 syncprov_qresp( opcookie *opc, syncops *so, int mode )
1036 {
1037         syncres *sr;
1038         resinfo *ri;
1039         int srsize;
1040         struct berval csn = opc->sctxcsn;
1041
1042         sr = ch_malloc( sizeof( syncres ));
1043         sr->s_next = NULL;
1044         sr->s_mode = mode;
1045         if ( !opc->ssres.s_info ) {
1046
1047                 srsize = sizeof( resinfo );
1048                 if ( csn.bv_len )
1049                         srsize += csn.bv_len + 1;
1050
1051                 if ( opc->se ) {
1052                         Attribute *a;
1053                         ri = ch_malloc( srsize );
1054                         ri->ri_dn = opc->se->e_name;
1055                         ri->ri_ndn = opc->se->e_nname;
1056                         a = attr_find( opc->se->e_attrs, slap_schema.si_ad_entryUUID );
1057                         if ( a )
1058                                 ri->ri_uuid = a->a_nvals[0];
1059                         else
1060                                 ri->ri_uuid.bv_len = 0;
1061                         if ( csn.bv_len ) {
1062                                 ri->ri_csn.bv_val = (char *)(ri + 1);
1063                                 ri->ri_csn.bv_len = csn.bv_len;
1064                                 memcpy( ri->ri_csn.bv_val, csn.bv_val, csn.bv_len );
1065                                 ri->ri_csn.bv_val[csn.bv_len] = '\0';
1066                         } else {
1067                                 ri->ri_csn.bv_val = NULL;
1068                         }
1069                 } else {
1070                         srsize += opc->suuid.bv_len +
1071                                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1;
1072                         ri = ch_malloc( srsize );
1073                         ri->ri_dn.bv_val = (char *)(ri + 1);
1074                         ri->ri_dn.bv_len = opc->sdn.bv_len;
1075                         ri->ri_ndn.bv_val = lutil_strcopy( ri->ri_dn.bv_val,
1076                                 opc->sdn.bv_val ) + 1;
1077                         ri->ri_ndn.bv_len = opc->sndn.bv_len;
1078                         ri->ri_uuid.bv_val = lutil_strcopy( ri->ri_ndn.bv_val,
1079                                 opc->sndn.bv_val ) + 1;
1080                         ri->ri_uuid.bv_len = opc->suuid.bv_len;
1081                         AC_MEMCPY( ri->ri_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1082                         if ( csn.bv_len ) {
1083                                 ri->ri_csn.bv_val = ri->ri_uuid.bv_val + ri->ri_uuid.bv_len;
1084                                 memcpy( ri->ri_csn.bv_val, csn.bv_val, csn.bv_len );
1085                                 ri->ri_csn.bv_val[csn.bv_len] = '\0';
1086                         } else {
1087                                 ri->ri_csn.bv_val = NULL;
1088                         }
1089                 }
1090                 ri->ri_list = &opc->ssres;
1091                 ri->ri_e = opc->se;
1092                 ri->ri_csn.bv_len = csn.bv_len;
1093                 ri->ri_isref = opc->sreference;
1094                 BER_BVZERO( &ri->ri_cookie );
1095                 ldap_pvt_thread_mutex_init( &ri->ri_mutex );
1096                 opc->se = NULL;
1097                 opc->ssres.s_info = ri;
1098         }
1099         ri = opc->ssres.s_info;
1100         sr->s_info = ri;
1101         ldap_pvt_thread_mutex_lock( &ri->ri_mutex );
1102         sr->s_rilist = ri->ri_list;
1103         ri->ri_list = sr;
1104         if ( mode == LDAP_SYNC_NEW_COOKIE && BER_BVISNULL( &ri->ri_cookie )) {
1105                 syncprov_info_t *si = opc->son->on_bi.bi_private;
1106
1107                 slap_compose_sync_cookie( NULL, &ri->ri_cookie, si->si_ctxcsn,
1108                         so->s_rid, slap_serverID ? slap_serverID : -1);
1109         }
1110         ldap_pvt_thread_mutex_unlock( &ri->ri_mutex );
1111
1112         ldap_pvt_thread_mutex_lock( &so->s_mutex );
1113         if ( !so->s_res ) {
1114                 so->s_res = sr;
1115         } else {
1116                 so->s_restail->s_next = sr;
1117         }
1118         so->s_restail = sr;
1119
1120         /* If the base of the psearch was modified, check it next time round */
1121         if ( so->s_flags & PS_WROTE_BASE ) {
1122                 so->s_flags ^= PS_WROTE_BASE;
1123                 so->s_flags |= PS_FIND_BASE;
1124         }
1125         if (( so->s_flags & (PS_IS_DETACHED|PS_TASK_QUEUED)) == PS_IS_DETACHED ) {
1126                 syncprov_qstart( so );
1127         }
1128         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
1129         return LDAP_SUCCESS;
1130 }
1131
1132 static int
1133 syncprov_drop_psearch( syncops *so, int lock )
1134 {
1135         if ( so->s_flags & PS_IS_DETACHED ) {
1136                 if ( lock )
1137                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
1138                 so->s_op->o_conn->c_n_ops_executing--;
1139                 so->s_op->o_conn->c_n_ops_completed++;
1140                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, Operation,
1141                         o_next );
1142                 if ( lock )
1143                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
1144         }
1145         return syncprov_free_syncop( so, FS_LOCK );
1146 }
1147
1148 static int
1149 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
1150 {
1151         slap_callback *sc = op->o_callback;
1152         op->o_callback = sc->sc_next;
1153         syncprov_drop_psearch( sc->sc_private, 0 );
1154         op->o_tmpfree( sc, op->o_tmpmemctx );
1155         return 0;
1156 }
1157
1158 static int
1159 syncprov_op_abandon( Operation *op, SlapReply *rs )
1160 {
1161         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1162         syncprov_info_t         *si = on->on_bi.bi_private;
1163         syncops *so, **sop;
1164
1165         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1166         for ( sop=&si->si_ops; (so = *sop); sop = &(*sop)->s_next ) {
1167                 if ( so->s_op->o_connid == op->o_connid &&
1168                         so->s_op->o_msgid == op->orn_msgid ) {
1169                                 so->s_op->o_abandon = 1;
1170                                 *sop = so->s_next;
1171                                 break;
1172                 }
1173         }
1174         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1175         if ( so ) {
1176                 /* Is this really a Cancel exop? */
1177                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
1178                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
1179                         rs->sr_err = LDAP_CANCELLED;
1180                         send_ldap_result( so->s_op, rs );
1181                         if ( so->s_flags & PS_IS_DETACHED ) {
1182                                 slap_callback *cb;
1183                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
1184                                 cb->sc_cleanup = syncprov_ab_cleanup;
1185                                 cb->sc_next = op->o_callback;
1186                                 cb->sc_private = so;
1187                                 op->o_callback = cb;
1188                                 return SLAP_CB_CONTINUE;
1189                         }
1190                 }
1191                 syncprov_drop_psearch( so, 0 );
1192         }
1193         return SLAP_CB_CONTINUE;
1194 }
1195
1196 /* Find which persistent searches are affected by this operation */
1197 static void
1198 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
1199 {
1200         slap_overinst *on = opc->son;
1201         syncprov_info_t         *si = on->on_bi.bi_private;
1202
1203         fbase_cookie fc;
1204         syncops **pss;
1205         Entry *e = NULL;
1206         Attribute *a;
1207         int rc, gonext;
1208         struct berval newdn;
1209         int freefdn = 0;
1210         BackendDB *b0 = op->o_bd, db;
1211
1212         fc.fdn = &op->o_req_ndn;
1213         /* compute new DN */
1214         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1215                 struct berval pdn;
1216                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
1217                 else dnParent( fc.fdn, &pdn );
1218                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
1219                 fc.fdn = &newdn;
1220                 freefdn = 1;
1221         }
1222         if ( op->o_tag != LDAP_REQ_ADD ) {
1223                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1224                         db = *op->o_bd;
1225                         op->o_bd = &db;
1226                 }
1227                 rc = overlay_entry_get_ov( op, fc.fdn, NULL, NULL, 0, &e, on );
1228                 /* If we're sending responses now, make a copy and unlock the DB */
1229                 if ( e && !saveit ) {
1230                         if ( !opc->se )
1231                                 opc->se = entry_dup( e );
1232                         overlay_entry_release_ov( op, e, 0, on );
1233                         e = opc->se;
1234                 }
1235                 if ( rc ) {
1236                         op->o_bd = b0;
1237                         return;
1238                 }
1239         } else {
1240                 e = op->ora_e;
1241                 if ( !saveit ) {
1242                         if ( !opc->se )
1243                                 opc->se = entry_dup( e );
1244                         e = opc->se;
1245                 }
1246         }
1247
1248         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1249                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1250                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1251                 opc->sreference = is_entry_referral( e );
1252                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1253                 if ( a )
1254                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1255         } else if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1256                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1257                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1258                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1259                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1260         }
1261
1262         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1263         for (pss = &si->si_ops; *pss; pss = gonext ? &(*pss)->s_next : pss)
1264         {
1265                 Operation op2;
1266                 Opheader oh;
1267                 syncmatches *sm;
1268                 int found = 0;
1269                 syncops *snext, *ss = *pss;
1270
1271                 gonext = 1;
1272                 if ( ss->s_op->o_abandon )
1273                         continue;
1274
1275                 /* Don't send ops back to the originator */
1276                 if ( opc->osid > 0 && opc->osid == ss->s_sid ) {
1277                         Debug( LDAP_DEBUG_SYNC, "syncprov_matchops: skipping original sid %03x\n",
1278                                 opc->osid, 0, 0 );
1279                         continue;
1280                 }
1281
1282                 /* Don't send ops back to the messenger */
1283                 if ( opc->rsid > 0 && opc->rsid == ss->s_sid ) {
1284                         Debug( LDAP_DEBUG_SYNC, "syncprov_matchops: skipping relayed sid %03x\n",
1285                                 opc->rsid, 0, 0 );
1286                         continue;
1287                 }
1288
1289                 /* validate base */
1290                 fc.fss = ss;
1291                 fc.fbase = 0;
1292                 fc.fscope = 0;
1293
1294                 /* If the base of the search is missing, signal a refresh */
1295                 rc = syncprov_findbase( op, &fc );
1296                 if ( rc != LDAP_SUCCESS ) {
1297                         SlapReply rs = {REP_RESULT};
1298                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1299                                 "search base has changed" );
1300                         snext = ss->s_next;
1301                         if ( syncprov_drop_psearch( ss, 1 ) )
1302                                 *pss = snext;
1303                         gonext = 0;
1304                         continue;
1305                 }
1306
1307                 /* If we're sending results now, look for this op in old matches */
1308                 if ( !saveit ) {
1309                         syncmatches *old;
1310
1311                         /* Did we modify the search base? */
1312                         if ( dn_match( &op->o_req_ndn, &ss->s_base )) {
1313                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1314                                 ss->s_flags |= PS_WROTE_BASE;
1315                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1316                         }
1317
1318                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1319                                 old=sm, sm=sm->sm_next ) {
1320                                 if ( sm->sm_op == ss ) {
1321                                         found = 1;
1322                                         old->sm_next = sm->sm_next;
1323                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1324                                         break;
1325                                 }
1326                         }
1327                 }
1328
1329                 if ( fc.fscope ) {
1330                         ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1331                         op2 = *ss->s_op;
1332                         oh = *op->o_hdr;
1333                         oh.oh_conn = ss->s_op->o_conn;
1334                         oh.oh_connid = ss->s_op->o_connid;
1335                         op2.o_bd = op->o_bd->bd_self;
1336                         op2.o_hdr = &oh;
1337                         op2.o_extra = op->o_extra;
1338                         op2.o_callback = NULL;
1339                         if (ss->s_flags & PS_FIX_FILTER) {
1340                                 /* Skip the AND/GE clause that we stuck on in front. We
1341                                    would lose deletes/mods that happen during the refresh
1342                                    phase otherwise (ITS#6555) */
1343                                 op2.ors_filter = ss->s_op->ors_filter->f_and->f_next;
1344                         }
1345                         rc = test_filter( &op2, e, op2.ors_filter );
1346                         ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1347                 }
1348
1349                 Debug( LDAP_DEBUG_TRACE, "syncprov_matchops: sid %03x fscope %d rc %d\n",
1350                         ss->s_sid, fc.fscope, rc );
1351
1352                 /* check if current o_req_dn is in scope and matches filter */
1353                 if ( fc.fscope && rc == LDAP_COMPARE_TRUE ) {
1354                         if ( saveit ) {
1355                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1356                                 sm->sm_next = opc->smatches;
1357                                 sm->sm_op = ss;
1358                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1359                                 ++ss->s_inuse;
1360                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1361                                 opc->smatches = sm;
1362                         } else {
1363                                 /* if found send UPDATE else send ADD */
1364                                 syncprov_qresp( opc, ss,
1365                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD );
1366                         }
1367                 } else if ( !saveit && found ) {
1368                         /* send DELETE */
1369                         syncprov_qresp( opc, ss, LDAP_SYNC_DELETE );
1370                 } else if ( !saveit ) {
1371                         syncprov_qresp( opc, ss, LDAP_SYNC_NEW_COOKIE );
1372                 }
1373                 if ( !saveit && found ) {
1374                         /* Decrement s_inuse, was incremented when called
1375                          * with saveit == TRUE
1376                          */
1377                         snext = ss->s_next;
1378                         if ( syncprov_free_syncop( ss, FS_LOCK ) ) {
1379                                 *pss = snext;
1380                                 gonext = 0;
1381                         }
1382                 }
1383         }
1384         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1385
1386         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1387                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1388                         op->o_bd = &db;
1389                 }
1390                 if ( saveit )
1391                         overlay_entry_release_ov( op, e, 0, on );
1392                 op->o_bd = b0;
1393         }
1394         if ( !saveit ) {
1395                 if ( opc->ssres.s_info )
1396                         free_resinfo( &opc->ssres );
1397                 else if ( opc->se )
1398                         entry_free( opc->se );
1399         }
1400         if ( freefdn ) {
1401                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1402         }
1403         op->o_bd = b0;
1404 }
1405
1406 static int
1407 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1408 {
1409         slap_callback *cb = op->o_callback;
1410         opcookie *opc = cb->sc_private;
1411         slap_overinst *on = opc->son;
1412         syncprov_info_t         *si = on->on_bi.bi_private;
1413         syncmatches *sm, *snext;
1414         modtarget *mt;
1415
1416         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1417         if ( si->si_active )
1418                 si->si_active--;
1419         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1420
1421         for (sm = opc->smatches; sm; sm=snext) {
1422                 snext = sm->sm_next;
1423                 syncprov_free_syncop( sm->sm_op, FS_LOCK|FS_UNLINK );
1424                 op->o_tmpfree( sm, op->o_tmpmemctx );
1425         }
1426
1427         /* Remove op from lock table */
1428         mt = opc->smt;
1429         if ( mt ) {
1430                 modinst *mi = (modinst *)(opc+1), **m2;
1431                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1432                 for (m2 = &mt->mt_mods; ; m2 = &(*m2)->mi_next) {
1433                         if ( *m2 == mi ) {
1434                                 *m2 = mi->mi_next;
1435                                 if ( mt->mt_tail == mi )
1436                                         mt->mt_tail = ( m2 == &mt->mt_mods ) ? NULL : (modinst *)m2;
1437                                 break;
1438                         }
1439                 }
1440                 /* If there are more, promote the next one */
1441                 if ( mt->mt_mods ) {
1442                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1443                 } else {
1444                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1445                         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1446                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1447                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1448                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1449                         ch_free( mt->mt_dn.bv_val );
1450                         ch_free( mt );
1451                 }
1452         }
1453         if ( !BER_BVISNULL( &opc->suuid ))
1454                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1455         if ( !BER_BVISNULL( &opc->sndn ))
1456                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1457         if ( !BER_BVISNULL( &opc->sdn ))
1458                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1459         op->o_callback = cb->sc_next;
1460         op->o_tmpfree(cb, op->o_tmpmemctx);
1461
1462         return 0;
1463 }
1464
1465 static void
1466 syncprov_checkpoint( Operation *op, slap_overinst *on )
1467 {
1468         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
1469         Modifications mod;
1470         Operation opm;
1471         SlapReply rsm = {REP_RESULT};
1472         slap_callback cb = {0};
1473         BackendDB be;
1474         BackendInfo *bi;
1475
1476 #ifdef CHECK_CSN
1477         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1478
1479         int i;
1480         for ( i=0; i<si->si_numcsns; i++ ) {
1481                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1482         }
1483 #endif
1484         mod.sml_numvals = si->si_numcsns;
1485         mod.sml_values = si->si_ctxcsn;
1486         mod.sml_nvalues = NULL;
1487         mod.sml_desc = slap_schema.si_ad_contextCSN;
1488         mod.sml_op = LDAP_MOD_REPLACE;
1489         mod.sml_flags = SLAP_MOD_INTERNAL;
1490         mod.sml_next = NULL;
1491
1492         cb.sc_response = slap_null_cb;
1493         opm = *op;
1494         opm.o_tag = LDAP_REQ_MODIFY;
1495         opm.o_callback = &cb;
1496         opm.orm_modlist = &mod;
1497         opm.orm_no_opattrs = 1;
1498         if ( SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1499                 be = *on->on_info->oi_origdb;
1500                 opm.o_bd = &be;
1501         }
1502         opm.o_req_dn = si->si_contextdn;
1503         opm.o_req_ndn = si->si_contextdn;
1504         bi = opm.o_bd->bd_info;
1505         opm.o_bd->bd_info = on->on_info->oi_orig;
1506         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1507         opm.o_no_schema_check = 1;
1508         opm.o_opid = -1;
1509         opm.o_bd->be_modify( &opm, &rsm );
1510
1511         if ( rsm.sr_err == LDAP_NO_SUCH_OBJECT &&
1512                 SLAP_SYNC_SUBENTRY( opm.o_bd )) {
1513                 const char      *text;
1514                 char txtbuf[SLAP_TEXT_BUFLEN];
1515                 size_t textlen = sizeof txtbuf;
1516                 Entry *e = slap_create_context_csn_entry( opm.o_bd, NULL );
1517                 rs_reinit( &rsm, REP_RESULT );
1518                 slap_mods2entry( &mod, &e, 0, 1, &text, txtbuf, textlen);
1519                 opm.ora_e = e;
1520                 opm.o_bd->be_add( &opm, &rsm );
1521                 if ( e == opm.ora_e )
1522                         be_entry_release_w( &opm, opm.ora_e );
1523         }
1524         opm.o_bd->bd_info = bi;
1525
1526         if ( mod.sml_next != NULL ) {
1527                 slap_mods_free( mod.sml_next, 1 );
1528         }
1529 #ifdef CHECK_CSN
1530         for ( i=0; i<si->si_numcsns; i++ ) {
1531                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1532         }
1533 #endif
1534 }
1535
1536 static void
1537 syncprov_add_slog( Operation *op )
1538 {
1539         opcookie *opc = op->o_callback->sc_private;
1540         slap_overinst *on = opc->son;
1541         syncprov_info_t         *si = on->on_bi.bi_private;
1542         sessionlog *sl;
1543         slog_entry *se;
1544
1545         sl = si->si_logs;
1546         {
1547                 if ( BER_BVISEMPTY( &op->o_csn ) ) {
1548                         /* During the syncrepl refresh phase we can receive operations
1549                          * without a csn.  We cannot reliably determine the consumers
1550                          * state with respect to such operations, so we ignore them and
1551                          * wipe out anything in the log if we see them.
1552                          */
1553                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1554                         while ( se = sl->sl_head ) {
1555                                 sl->sl_head = se->se_next;
1556                                 ch_free( se );
1557                         }
1558                         sl->sl_tail = NULL;
1559                         sl->sl_num = 0;
1560                         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1561                         return;
1562                 }
1563
1564                 /* Allocate a record. UUIDs are not NUL-terminated. */
1565                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1566                         op->o_csn.bv_len + 1 );
1567                 se->se_next = NULL;
1568                 se->se_tag = op->o_tag;
1569
1570                 se->se_uuid.bv_val = (char *)(&se[1]);
1571                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1572                 se->se_uuid.bv_len = opc->suuid.bv_len;
1573
1574                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1575                 AC_MEMCPY( se->se_csn.bv_val, op->o_csn.bv_val, op->o_csn.bv_len );
1576                 se->se_csn.bv_val[op->o_csn.bv_len] = '\0';
1577                 se->se_csn.bv_len = op->o_csn.bv_len;
1578                 se->se_sid = slap_parse_csn_sid( &se->se_csn );
1579
1580                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1581                 if ( sl->sl_head ) {
1582                         /* Keep the list in csn order. */
1583                         if ( ber_bvcmp( &sl->sl_tail->se_csn, &se->se_csn ) <= 0 ) {
1584                                 sl->sl_tail->se_next = se;
1585                                 sl->sl_tail = se;
1586                         } else {
1587                                 slog_entry **sep;
1588
1589                                 for ( sep = &sl->sl_head; *sep; sep = &(*sep)->se_next ) {
1590                                         if ( ber_bvcmp( &se->se_csn, &(*sep)->se_csn ) < 0 ) {
1591                                                 se->se_next = *sep;
1592                                                 *sep = se;
1593                                                 break;
1594                                         }
1595                                 }
1596                         }
1597                 } else {
1598                         sl->sl_head = se;
1599                         sl->sl_tail = se;
1600                         if ( !sl->sl_mincsn ) {
1601                                 sl->sl_numcsns = 1;
1602                                 sl->sl_mincsn = ch_malloc( 2*sizeof( struct berval ));
1603                                 sl->sl_sids = ch_malloc( sizeof( int ));
1604                                 sl->sl_sids[0] = se->se_sid;
1605                                 ber_dupbv( sl->sl_mincsn, &se->se_csn );
1606                                 BER_BVZERO( &sl->sl_mincsn[1] );
1607                         }
1608                 }
1609                 sl->sl_num++;
1610                 while ( sl->sl_num > sl->sl_size ) {
1611                         int i;
1612                         se = sl->sl_head;
1613                         sl->sl_head = se->se_next;
1614                         for ( i=0; i<sl->sl_numcsns; i++ )
1615                                 if ( sl->sl_sids[i] >= se->se_sid )
1616                                         break;
1617                         if  ( i == sl->sl_numcsns || sl->sl_sids[i] != se->se_sid ) {
1618                                 slap_insert_csn_sids( (struct sync_cookie *)sl,
1619                                         i, se->se_sid, &se->se_csn );
1620                         } else {
1621                                 ber_bvreplace( &sl->sl_mincsn[i], &se->se_csn );
1622                         }
1623                         ch_free( se );
1624                         sl->sl_num--;
1625                 }
1626                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1627         }
1628 }
1629
1630 /* Just set a flag if we found the matching entry */
1631 static int
1632 playlog_cb( Operation *op, SlapReply *rs )
1633 {
1634         if ( rs->sr_type == REP_SEARCH ) {
1635                 op->o_callback->sc_private = (void *)1;
1636         }
1637         return rs->sr_err;
1638 }
1639
1640 /* enter with sl->sl_mutex locked, release before returning */
1641 static void
1642 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1643         sync_control *srs, BerVarray ctxcsn, int numcsns, int *sids )
1644 {
1645         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1646         slog_entry *se;
1647         int i, j, ndel, num, nmods, mmods;
1648         char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
1649         BerVarray uuids;
1650         struct berval delcsn[2];
1651
1652         if ( !sl->sl_num ) {
1653                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1654                 return;
1655         }
1656
1657         num = sl->sl_num;
1658         i = 0;
1659         nmods = 0;
1660
1661         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1662                 num * UUID_LEN, op->o_tmpmemctx );
1663         uuids[0].bv_val = (char *)(uuids + num + 1);
1664
1665         delcsn[0].bv_len = 0;
1666         delcsn[0].bv_val = cbuf;
1667         BER_BVZERO(&delcsn[1]);
1668
1669         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1670          * and everything else at the end. Do this first so we can
1671          * unlock the list mutex.
1672          */
1673         Debug( LDAP_DEBUG_SYNC, "srs csn %s\n",
1674                 srs->sr_state.ctxcsn[0].bv_val, 0, 0 );
1675         for ( se=sl->sl_head; se; se=se->se_next ) {
1676                 int k;
1677                 Debug( LDAP_DEBUG_SYNC, "log csn %s\n", se->se_csn.bv_val, 0, 0 );
1678                 ndel = 1;
1679                 for ( k=0; k<srs->sr_state.numcsns; k++ ) {
1680                         if ( se->se_sid == srs->sr_state.sids[k] ) {
1681                                 ndel = ber_bvcmp( &se->se_csn, &srs->sr_state.ctxcsn[k] );
1682                                 break;
1683                         }
1684                 }
1685                 if ( ndel <= 0 ) {
1686                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too old\n", ndel, 0, 0 );
1687                         continue;
1688                 }
1689                 ndel = 0;
1690                 for ( k=0; k<numcsns; k++ ) {
1691                         if ( se->se_sid == sids[k] ) {
1692                                 ndel = ber_bvcmp( &se->se_csn, &ctxcsn[k] );
1693                                 break;
1694                         }
1695                 }
1696                 if ( ndel > 0 ) {
1697                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too new\n", ndel, 0, 0 );
1698                         break;
1699                 }
1700                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1701                         j = i;
1702                         i++;
1703                         AC_MEMCPY( cbuf, se->se_csn.bv_val, se->se_csn.bv_len );
1704                         delcsn[0].bv_len = se->se_csn.bv_len;
1705                         delcsn[0].bv_val[delcsn[0].bv_len] = '\0';
1706                 } else {
1707                         if ( se->se_tag == LDAP_REQ_ADD )
1708                                 continue;
1709                         nmods++;
1710                         j = num - nmods;
1711                 }
1712                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1713                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1714                 uuids[j].bv_len = UUID_LEN;
1715         }
1716         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1717
1718         ndel = i;
1719
1720         /* Zero out unused slots */
1721         for ( i=ndel; i < num - nmods; i++ )
1722                 uuids[i].bv_len = 0;
1723
1724         /* Mods must be validated to see if they belong in this delete set.
1725          */
1726
1727         mmods = nmods;
1728         /* Strip any duplicates */
1729         for ( i=0; i<nmods; i++ ) {
1730                 for ( j=0; j<ndel; j++ ) {
1731                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1732                                 uuids[num - 1 - i].bv_len = 0;
1733                                 mmods --;
1734                                 break;
1735                         }
1736                 }
1737                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1738                 for ( j=0; j<i; j++ ) {
1739                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1740                                 uuids[num - 1 - i].bv_len = 0;
1741                                 mmods --;
1742                                 break;
1743                         }
1744                 }
1745         }
1746
1747         if ( mmods ) {
1748                 Operation fop;
1749                 int rc;
1750                 Filter mf, af;
1751                 AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
1752                 slap_callback cb = {0};
1753
1754                 fop = *op;
1755
1756                 fop.o_sync_mode = 0;
1757                 fop.o_callback = &cb;
1758                 fop.ors_limit = NULL;
1759                 fop.ors_tlimit = SLAP_NO_LIMIT;
1760                 fop.ors_attrs = slap_anlist_all_attributes;
1761                 fop.ors_attrsonly = 0;
1762                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1763
1764                 af.f_choice = LDAP_FILTER_AND;
1765                 af.f_next = NULL;
1766                 af.f_and = &mf;
1767                 mf.f_choice = LDAP_FILTER_EQUALITY;
1768                 mf.f_ava = &eq;
1769                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1770                 mf.f_next = fop.ors_filter;
1771
1772                 fop.ors_filter = &af;
1773
1774                 cb.sc_response = playlog_cb;
1775                 fop.o_bd->bd_info = (BackendInfo *)on->on_info;
1776
1777                 for ( i=ndel; i<num; i++ ) {
1778                   if ( uuids[i].bv_len != 0 ) {
1779                         SlapReply frs = { REP_RESULT };
1780
1781                         mf.f_av_value = uuids[i];
1782                         cb.sc_private = NULL;
1783                         fop.ors_slimit = 1;
1784                         rc = fop.o_bd->be_search( &fop, &frs );
1785
1786                         /* If entry was not found, add to delete list */
1787                         if ( !cb.sc_private ) {
1788                                 uuids[ndel++] = uuids[i];
1789                         }
1790                   }
1791                 }
1792                 fop.o_bd->bd_info = (BackendInfo *)on;
1793         }
1794         if ( ndel ) {
1795                 struct berval cookie;
1796
1797                 if ( delcsn[0].bv_len ) {
1798                         slap_compose_sync_cookie( op, &cookie, delcsn, srs->sr_state.rid,
1799                                 slap_serverID ? slap_serverID : -1 );
1800
1801                         Debug( LDAP_DEBUG_SYNC, "syncprov_playlog: cookie=%s\n", cookie.bv_val, 0, 0 );
1802                 }
1803
1804                 uuids[ndel].bv_val = NULL;
1805                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET,
1806                         delcsn[0].bv_len ? &cookie : NULL, 0, uuids, 1 );
1807                 if ( delcsn[0].bv_len ) {
1808                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1809                 }
1810         }
1811         op->o_tmpfree( uuids, op->o_tmpmemctx );
1812 }
1813
1814 static int
1815 syncprov_new_ctxcsn( opcookie *opc, syncprov_info_t *si, int csn_changed, int numvals, BerVarray vals )
1816 {
1817         unsigned i;
1818         int j, sid;
1819
1820         for ( i=0; i<numvals; i++ ) {
1821                 sid = slap_parse_csn_sid( &vals[i] );
1822                 for ( j=0; j<si->si_numcsns; j++ ) {
1823                         if ( sid < si->si_sids[j] )
1824                                 break;
1825                         if ( sid == si->si_sids[j] ) {
1826                                 if ( ber_bvcmp( &vals[i], &si->si_ctxcsn[j] ) > 0 ) {
1827                                         ber_bvreplace( &si->si_ctxcsn[j], &vals[i] );
1828                                         csn_changed = 1;
1829                                 }
1830                                 break;
1831                         }
1832                 }
1833
1834                 if ( j == si->si_numcsns || sid != si->si_sids[j] ) {
1835                         slap_insert_csn_sids( (struct sync_cookie *)&si->si_ctxcsn,
1836                                 j, sid, &vals[i] );
1837                         csn_changed = 1;
1838                 }
1839         }
1840         if ( csn_changed )
1841                 si->si_dirty = 0;
1842         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1843
1844         if ( csn_changed ) {
1845                 syncops *ss;
1846                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1847                 for ( ss = si->si_ops; ss; ss = ss->s_next ) {
1848                         if ( ss->s_op->o_abandon )
1849                                 continue;
1850                         /* Send the updated csn to all syncrepl consumers,
1851                          * including the server from which it originated.
1852                          * The syncrepl consumer and syncprov provider on
1853                          * the originating server may be configured to store
1854                          * their csn values in different entries.
1855                          */
1856                         syncprov_qresp( opc, ss, LDAP_SYNC_NEW_COOKIE );
1857                 }
1858                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1859         }
1860         return csn_changed;
1861 }
1862
1863 static int
1864 syncprov_op_response( Operation *op, SlapReply *rs )
1865 {
1866         opcookie *opc = op->o_callback->sc_private;
1867         slap_overinst *on = opc->son;
1868         syncprov_info_t         *si = on->on_bi.bi_private;
1869         syncmatches *sm;
1870
1871         if ( rs->sr_err == LDAP_SUCCESS )
1872         {
1873                 struct berval maxcsn;
1874                 char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
1875                 int do_check = 0, have_psearches, foundit, csn_changed = 0;
1876
1877                 ldap_pvt_thread_mutex_lock( &si->si_resp_mutex );
1878
1879                 /* Update our context CSN */
1880                 cbuf[0] = '\0';
1881                 maxcsn.bv_val = cbuf;
1882                 maxcsn.bv_len = sizeof(cbuf);
1883                 ldap_pvt_thread_rdwr_wlock( &si->si_csn_rwlock );
1884
1885                 slap_get_commit_csn( op, &maxcsn, &foundit );
1886                 if ( BER_BVISEMPTY( &maxcsn ) && SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1887                         /* syncrepl queues the CSN values in the db where
1888                          * it is configured , not where the changes are made.
1889                          * So look for a value in the glue db if we didn't
1890                          * find any in this db.
1891                          */
1892                         BackendDB *be = op->o_bd;
1893                         op->o_bd = select_backend( &be->be_nsuffix[0], 1);
1894                         maxcsn.bv_val = cbuf;
1895                         maxcsn.bv_len = sizeof(cbuf);
1896                         slap_get_commit_csn( op, &maxcsn, &foundit );
1897                         op->o_bd = be;
1898                 }
1899                 if ( !BER_BVISEMPTY( &maxcsn ) ) {
1900                         int i, sid;
1901 #ifdef CHECK_CSN
1902                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1903                         assert( !syn->ssyn_validate( syn, &maxcsn ));
1904 #endif
1905                         sid = slap_parse_csn_sid( &maxcsn );
1906                         for ( i=0; i<si->si_numcsns; i++ ) {
1907                                 if ( sid < si->si_sids[i] )
1908                                         break;
1909                                 if ( sid == si->si_sids[i] ) {
1910                                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn[i] ) > 0 ) {
1911                                                 ber_bvreplace( &si->si_ctxcsn[i], &maxcsn );
1912                                                 csn_changed = 1;
1913                                         }
1914                                         break;
1915                                 }
1916                         }
1917                         /* It's a new SID for us */
1918                         if ( i == si->si_numcsns || sid != si->si_sids[i] ) {
1919                                 slap_insert_csn_sids((struct sync_cookie *)&(si->si_ctxcsn),
1920                                         i, sid, &maxcsn );
1921                                 csn_changed = 1;
1922                         }
1923                 }
1924
1925                 /* Don't do any processing for consumer contextCSN updates */
1926                 if ( op->o_dont_replicate ) {
1927                         if ( op->o_tag == LDAP_REQ_MODIFY &&
1928                                 op->orm_modlist->sml_op == LDAP_MOD_REPLACE &&
1929                                 op->orm_modlist->sml_desc == slap_schema.si_ad_contextCSN ) {
1930                         /* Catch contextCSN updates from syncrepl. We have to look at
1931                          * all the attribute values, as there may be more than one csn
1932                          * that changed, and only one can be passed in the csn queue.
1933                          */
1934                                 csn_changed = syncprov_new_ctxcsn( opc, si, csn_changed,
1935                                         op->orm_modlist->sml_numvals, op->orm_modlist->sml_values );
1936                         } else {
1937                                 ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1938                         }
1939                         if ( csn_changed )
1940                                 si->si_numops++;
1941                         goto leave;
1942                 }
1943
1944                 /* If we're adding the context entry, parse all of its contextCSNs */
1945                 if ( op->o_tag == LDAP_REQ_ADD &&
1946                         dn_match( &op->o_req_ndn, &si->si_contextdn )) {
1947                         Attribute *a = attr_find( op->ora_e->e_attrs, slap_schema.si_ad_contextCSN );
1948                         if ( a ) {
1949                                 csn_changed = syncprov_new_ctxcsn( opc, si, csn_changed, a->a_numvals, a->a_vals );
1950                                 if ( csn_changed )
1951                                         si->si_numops++;
1952                                 goto added;
1953                         }
1954                 }
1955
1956                 if ( csn_changed )
1957                         si->si_numops++;
1958                 if ( si->si_chkops || si->si_chktime ) {
1959                         /* Never checkpoint adding the context entry,
1960                          * it will deadlock
1961                          */
1962                         if ( op->o_tag != LDAP_REQ_ADD ||
1963                                 !dn_match( &op->o_req_ndn, &si->si_contextdn )) {
1964                                 if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1965                                         do_check = 1;
1966                                         si->si_numops = 0;
1967                                 }
1968                                 if ( si->si_chktime &&
1969                                         (op->o_time - si->si_chklast >= si->si_chktime )) {
1970                                         if ( si->si_chklast ) {
1971                                                 do_check = 1;
1972                                                 si->si_chklast = op->o_time;
1973                                         } else {
1974                                                 si->si_chklast = 1;
1975                                         }
1976                                 }
1977                         }
1978                 }
1979                 si->si_dirty = !csn_changed;
1980                 ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1981
1982 added:
1983                 if ( do_check ) {
1984                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1985                         syncprov_checkpoint( op, on );
1986                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1987                 }
1988
1989                 /* only update consumer ctx if this is a newer csn */
1990                 if ( csn_changed ) {
1991                         opc->sctxcsn = maxcsn;
1992                 }
1993
1994                 /* Handle any persistent searches */
1995                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1996                 have_psearches = ( si->si_ops != NULL );
1997                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1998                 if ( have_psearches ) {
1999                         switch(op->o_tag) {
2000                         case LDAP_REQ_ADD:
2001                         case LDAP_REQ_MODIFY:
2002                         case LDAP_REQ_MODRDN:
2003                         case LDAP_REQ_EXTENDED:
2004                                 syncprov_matchops( op, opc, 0 );
2005                                 break;
2006                         case LDAP_REQ_DELETE:
2007                                 /* for each match in opc->smatches:
2008                                  *   send DELETE msg
2009                                  */
2010                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
2011                                         if ( sm->sm_op->s_op->o_abandon )
2012                                                 continue;
2013                                         syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_DELETE );
2014                                 }
2015                                 if ( opc->ssres.s_info )
2016                                         free_resinfo( &opc->ssres );
2017                                 break;
2018                         }
2019                 }
2020
2021                 /* Add any log records */
2022                 if ( si->si_logs ) {
2023                         syncprov_add_slog( op );
2024                 }
2025 leave:          ldap_pvt_thread_mutex_unlock( &si->si_resp_mutex );
2026         }
2027         return SLAP_CB_CONTINUE;
2028 }
2029
2030 /* We don't use a subentry to store the context CSN any more.
2031  * We expose the current context CSN as an operational attribute
2032  * of the suffix entry.
2033  */
2034 static int
2035 syncprov_op_compare( Operation *op, SlapReply *rs )
2036 {
2037         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2038         syncprov_info_t         *si = on->on_bi.bi_private;
2039         int rc = SLAP_CB_CONTINUE;
2040
2041         if ( dn_match( &op->o_req_ndn, &si->si_contextdn ) &&
2042                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
2043         {
2044                 Entry e = {0};
2045                 Attribute a = {0};
2046
2047                 e.e_name = si->si_contextdn;
2048                 e.e_nname = si->si_contextdn;
2049                 e.e_attrs = &a;
2050
2051                 a.a_desc = slap_schema.si_ad_contextCSN;
2052
2053                 ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2054
2055                 a.a_vals = si->si_ctxcsn;
2056                 a.a_nvals = a.a_vals;
2057                 a.a_numvals = si->si_numcsns;
2058
2059                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
2060                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
2061                 if ( ! rs->sr_err ) {
2062                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
2063                         goto return_results;
2064                 }
2065
2066                 if ( get_assert( op ) &&
2067                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
2068                 {
2069                         rs->sr_err = LDAP_ASSERTION_FAILED;
2070                         goto return_results;
2071                 }
2072
2073
2074                 rs->sr_err = LDAP_COMPARE_FALSE;
2075
2076                 if ( attr_valfind( &a,
2077                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
2078                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
2079                                 &op->oq_compare.rs_ava->aa_value, NULL, op->o_tmpmemctx ) == 0 )
2080                 {
2081                         rs->sr_err = LDAP_COMPARE_TRUE;
2082                 }
2083
2084 return_results:;
2085
2086                 ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2087
2088                 send_ldap_result( op, rs );
2089
2090                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
2091                         rs->sr_err = LDAP_SUCCESS;
2092                 }
2093                 rc = rs->sr_err;
2094         }
2095
2096         return rc;
2097 }
2098
2099 static int
2100 syncprov_op_mod( Operation *op, SlapReply *rs )
2101 {
2102         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2103         syncprov_info_t         *si = on->on_bi.bi_private;
2104         slap_callback *cb;
2105         opcookie *opc;
2106         int have_psearches, cbsize;
2107
2108         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2109         have_psearches = ( si->si_ops != NULL );
2110         si->si_active++;
2111         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2112
2113         cbsize = sizeof(slap_callback) + sizeof(opcookie) +
2114                 (have_psearches ? sizeof(modinst) : 0 );
2115
2116         cb = op->o_tmpcalloc(1, cbsize, op->o_tmpmemctx);
2117         opc = (opcookie *)(cb+1);
2118         opc->son = on;
2119         cb->sc_response = syncprov_op_response;
2120         cb->sc_cleanup = syncprov_op_cleanup;
2121         cb->sc_private = opc;
2122         cb->sc_next = op->o_callback;
2123         op->o_callback = cb;
2124
2125         opc->osid = -1;
2126         opc->rsid = -1;
2127         if ( op->o_csn.bv_val ) {
2128                 opc->osid = slap_parse_csn_sid( &op->o_csn );
2129         }
2130         if ( op->o_controls ) {
2131                 struct sync_cookie *scook =
2132                 op->o_controls[slap_cids.sc_LDAPsync];
2133                 if ( scook )
2134                         opc->rsid = scook->sid;
2135         }
2136
2137         if ( op->o_dont_replicate )
2138                 return SLAP_CB_CONTINUE;
2139
2140         /* If there are active persistent searches, lock this operation.
2141          * See seqmod.c for the locking logic on its own.
2142          */
2143         if ( have_psearches ) {
2144                 modtarget *mt, mtdummy;
2145                 modinst *mi;
2146
2147                 mi = (modinst *)(opc+1);
2148                 mi->mi_op = op;
2149
2150                 /* See if we're already modifying this entry... */
2151                 mtdummy.mt_dn = op->o_req_ndn;
2152 retry:
2153                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
2154                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
2155                 if ( mt ) {
2156                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
2157                         if ( mt->mt_mods == NULL ) {
2158                                 /* Cannot reuse this mt, as another thread is about
2159                                  * to release it in syncprov_op_cleanup. Wait for them
2160                                  * to finish; our own insert is required to succeed.
2161                                  */
2162                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2163                                 ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
2164                                 ldap_pvt_thread_yield();
2165                                 goto retry;
2166                         }
2167                 }
2168                 if ( mt ) {
2169                         mt->mt_tail->mi_next = mi;
2170                         mt->mt_tail = mi;
2171                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
2172                         /* wait for this op to get to head of list */
2173                         while ( mt->mt_mods != mi ) {
2174                                 modinst *m2;
2175                                 /* don't wait on other mods from the same thread */
2176                                 for ( m2 = mt->mt_mods; m2; m2 = m2->mi_next ) {
2177                                         if ( m2->mi_op->o_threadctx == op->o_threadctx ) {
2178                                                 break;
2179                                         }
2180                                 }
2181                                 if ( m2 )
2182                                         break;
2183
2184                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2185                                 /* FIXME: if dynamic config can delete overlays or
2186                                  * databases we'll have to check for cleanup here.
2187                                  * Currently it's not an issue because there are
2188                                  * no dynamic config deletes...
2189                                  */
2190                                 if ( slapd_shutdown )
2191                                         return SLAPD_ABANDON;
2192
2193                                 if ( !ldap_pvt_thread_pool_pausecheck( &connection_pool ))
2194                                         ldap_pvt_thread_yield();
2195                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
2196
2197                                 /* clean up if the caller is giving up */
2198                                 if ( op->o_abandon ) {
2199                                         modinst **m2;
2200                                         slap_callback **sc;
2201                                         for (m2 = &mt->mt_mods; ; m2 = &(*m2)->mi_next) {
2202                                                 if ( *m2 == mi ) {
2203                                                         *m2 = mi->mi_next;
2204                                                         if ( mt->mt_tail == mi )
2205                                                                 mt->mt_tail = ( m2 == &mt->mt_mods ) ? NULL : (modinst *)m2;
2206                                                         break;
2207                                                 }
2208                                         }
2209                                         for (sc = &op->o_callback; ; sc = &(*sc)->sc_next) {
2210                                                 if ( *sc == cb ) {
2211                                                         *sc = cb->sc_next;
2212                                                         break;
2213                                                 }
2214                                         }
2215                                         op->o_tmpfree( cb, op->o_tmpmemctx );
2216                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2217                                         return SLAPD_ABANDON;
2218                                 }
2219                         }
2220                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2221                 } else {
2222                         /* Record that we're modifying this entry now */
2223                         mt = ch_malloc( sizeof(modtarget) );
2224                         mt->mt_mods = mi;
2225                         mt->mt_tail = mi;
2226                         ber_dupbv( &mt->mt_dn, &mi->mi_op->o_req_ndn );
2227                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
2228                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
2229                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
2230                 }
2231                 opc->smt = mt;
2232         }
2233
2234         if (( have_psearches || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
2235                 syncprov_matchops( op, opc, 1 );
2236
2237         return SLAP_CB_CONTINUE;
2238 }
2239
2240 static int
2241 syncprov_op_extended( Operation *op, SlapReply *rs )
2242 {
2243         if ( exop_is_write( op ))
2244                 return syncprov_op_mod( op, rs );
2245
2246         return SLAP_CB_CONTINUE;
2247 }
2248
2249 typedef struct searchstate {
2250         slap_overinst *ss_on;
2251         syncops *ss_so;
2252         BerVarray ss_ctxcsn;
2253         int *ss_sids;
2254         int ss_numcsns;
2255 #define SS_PRESENT      0x01
2256 #define SS_CHANGED      0x02
2257         int ss_flags;
2258 } searchstate;
2259
2260 typedef struct SyncOperationBuffer {
2261         Operation               sob_op;
2262         Opheader                sob_hdr;
2263         OpExtra                 sob_oe;
2264         AttributeName   sob_extra;      /* not always present */
2265         /* Further data allocated here */
2266 } SyncOperationBuffer;
2267
2268 static void
2269 syncprov_detach_op( Operation *op, syncops *so, slap_overinst *on )
2270 {
2271         SyncOperationBuffer *sopbuf2;
2272         Operation *op2;
2273         int i, alen = 0;
2274         size_t size;
2275         char *ptr;
2276         GroupAssertion *g1, *g2;
2277
2278         /* count the search attrs */
2279         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2280                 alen += op->ors_attrs[i].an_name.bv_len + 1;
2281         }
2282         /* Make a new copy of the operation */
2283         size = offsetof( SyncOperationBuffer, sob_extra ) +
2284                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
2285                 op->o_req_dn.bv_len + 1 +
2286                 op->o_req_ndn.bv_len + 1 +
2287                 op->o_ndn.bv_len + 1 +
2288                 so->s_filterstr.bv_len + 1;
2289         sopbuf2 = ch_calloc( 1, size );
2290         op2 = &sopbuf2->sob_op;
2291         op2->o_hdr = &sopbuf2->sob_hdr;
2292         LDAP_SLIST_FIRST(&op2->o_extra) = &sopbuf2->sob_oe;
2293
2294         /* Copy the fields we care about explicitly, leave the rest alone */
2295         *op2->o_hdr = *op->o_hdr;
2296         op2->o_tag = op->o_tag;
2297         op2->o_time = op->o_time;
2298         op2->o_bd = on->on_info->oi_origdb;
2299         op2->o_request = op->o_request;
2300         op2->o_managedsait = op->o_managedsait;
2301         LDAP_SLIST_FIRST(&op2->o_extra)->oe_key = on;
2302         LDAP_SLIST_NEXT(LDAP_SLIST_FIRST(&op2->o_extra), oe_next) = NULL;
2303
2304         ptr = (char *) sopbuf2 + offsetof( SyncOperationBuffer, sob_extra );
2305         if ( i ) {
2306                 op2->ors_attrs = (AttributeName *) ptr;
2307                 ptr = (char *) &op2->ors_attrs[i+1];
2308                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2309                         op2->ors_attrs[i] = op->ors_attrs[i];
2310                         op2->ors_attrs[i].an_name.bv_val = ptr;
2311                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
2312                 }
2313                 BER_BVZERO( &op2->ors_attrs[i].an_name );
2314         }
2315
2316         op2->o_authz = op->o_authz;
2317         op2->o_ndn.bv_val = ptr;
2318         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
2319         op2->o_dn = op2->o_ndn;
2320         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
2321         op2->o_req_dn.bv_val = ptr;
2322         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
2323         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
2324         op2->o_req_ndn.bv_val = ptr;
2325         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
2326         op2->ors_filterstr.bv_val = ptr;
2327         strcpy( ptr, so->s_filterstr.bv_val );
2328         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
2329
2330         /* Skip the AND/GE clause that we stuck on in front */
2331         if ( so->s_flags & PS_FIX_FILTER ) {
2332                 op2->ors_filter = op->ors_filter->f_and->f_next;
2333                 so->s_flags ^= PS_FIX_FILTER;
2334         } else {
2335                 op2->ors_filter = op->ors_filter;
2336         }
2337         op2->ors_filter = filter_dup( op2->ors_filter, NULL );
2338         so->s_op = op2;
2339
2340         /* Copy any cached group ACLs individually */
2341         op2->o_groups = NULL;
2342         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
2343                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
2344                 *g2 = *g1;
2345                 strcpy( g2->ga_ndn, g1->ga_ndn );
2346                 g2->ga_next = op2->o_groups;
2347                 op2->o_groups = g2;
2348         }
2349         /* Don't allow any further group caching */
2350         op2->o_do_not_cache = 1;
2351
2352         /* Add op2 to conn so abandon will find us */
2353         op->o_conn->c_n_ops_executing++;
2354         op->o_conn->c_n_ops_completed--;
2355         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
2356         so->s_flags |= PS_IS_DETACHED;
2357
2358         /* Prevent anyone else from trying to send a result for this op */
2359         op->o_abandon = 1;
2360 }
2361
2362 static int
2363 syncprov_search_response( Operation *op, SlapReply *rs )
2364 {
2365         searchstate *ss = op->o_callback->sc_private;
2366         slap_overinst *on = ss->ss_on;
2367         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2368         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
2369
2370         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
2371                 Attribute *a;
2372                 /* If we got a referral without a referral object, there's
2373                  * something missing that we cannot replicate. Just ignore it.
2374                  * The consumer will abort because we didn't send the expected
2375                  * control.
2376                  */
2377                 if ( !rs->sr_entry ) {
2378                         assert( rs->sr_entry != NULL );
2379                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
2380                         return SLAP_CB_CONTINUE;
2381                 }
2382                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryCSN );
2383                 if ( a == NULL && rs->sr_operational_attrs != NULL ) {
2384                         a = attr_find( rs->sr_operational_attrs, slap_schema.si_ad_entryCSN );
2385                 }
2386                 if ( a ) {
2387                         int i, sid;
2388                         sid = slap_parse_csn_sid( &a->a_nvals[0] );
2389
2390                         /* Don't send changed entries back to the originator */
2391                         if ( sid == srs->sr_state.sid && srs->sr_state.numcsns ) {
2392                                 Debug( LDAP_DEBUG_SYNC,
2393                                         "Entry %s changed by peer, ignored\n",
2394                                         rs->sr_entry->e_name.bv_val, 0, 0 );
2395                                 return LDAP_SUCCESS;
2396                         }
2397
2398                         /* If not a persistent search */
2399                         if ( !ss->ss_so ) {
2400                                 /* Make sure entry is less than the snapshot'd contextCSN */
2401                                 for ( i=0; i<ss->ss_numcsns; i++ ) {
2402                                         if ( sid == ss->ss_sids[i] && ber_bvcmp( &a->a_nvals[0],
2403                                                 &ss->ss_ctxcsn[i] ) > 0 ) {
2404                                                 Debug( LDAP_DEBUG_SYNC,
2405                                                         "Entry %s CSN %s greater than snapshot %s\n",
2406                                                         rs->sr_entry->e_name.bv_val,
2407                                                         a->a_nvals[0].bv_val,
2408                                                         ss->ss_ctxcsn[i].bv_val );
2409                                                 return LDAP_SUCCESS;
2410                                         }
2411                                 }
2412                         }
2413
2414                         /* Don't send old entries twice */
2415                         if ( srs->sr_state.ctxcsn ) {
2416                                 for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2417                                         if ( sid == srs->sr_state.sids[i] &&
2418                                                 ber_bvcmp( &a->a_nvals[0],
2419                                                         &srs->sr_state.ctxcsn[i] )<= 0 ) {
2420                                                 Debug( LDAP_DEBUG_SYNC,
2421                                                         "Entry %s CSN %s older or equal to ctx %s\n",
2422                                                         rs->sr_entry->e_name.bv_val,
2423                                                         a->a_nvals[0].bv_val,
2424                                                         srs->sr_state.ctxcsn[i].bv_val );
2425                                                 return LDAP_SUCCESS;
2426                                         }
2427                                 }
2428                         }
2429                 }
2430                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2431                         op->o_tmpmemctx );
2432                 rs->sr_ctrls[1] = NULL;
2433                 rs->sr_flags |= REP_CTRLS_MUSTBEFREED;
2434                 /* If we're in delta-sync mode, always send a cookie */
2435                 if ( si->si_nopres && si->si_usehint && a ) {
2436                         struct berval cookie;
2437                         slap_compose_sync_cookie( op, &cookie, a->a_nvals, srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2438                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2439                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 1, &cookie );
2440                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2441                 } else {
2442                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2443                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
2444                 }
2445         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
2446                 struct berval cookie = BER_BVNULL;
2447
2448                 if ( ( ss->ss_flags & SS_CHANGED ) &&
2449                         ss->ss_ctxcsn && !BER_BVISNULL( &ss->ss_ctxcsn[0] )) {
2450                         slap_compose_sync_cookie( op, &cookie, ss->ss_ctxcsn,
2451                                 srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2452
2453                         Debug( LDAP_DEBUG_SYNC, "syncprov_search_response: cookie=%s\n", cookie.bv_val, 0, 0 );
2454                 }
2455
2456                 /* Is this a regular refresh?
2457                  * Note: refresh never gets here if there were no changes
2458                  */
2459                 if ( !ss->ss_so ) {
2460                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2461                                 op->o_tmpmemctx );
2462                         rs->sr_ctrls[1] = NULL;
2463                         rs->sr_flags |= REP_CTRLS_MUSTBEFREED;
2464                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
2465                                 0, 1, &cookie, ( ss->ss_flags & SS_PRESENT ) ?  LDAP_SYNC_REFRESH_PRESENTS :
2466                                         LDAP_SYNC_REFRESH_DELETES );
2467                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2468                 } else {
2469                 /* It's RefreshAndPersist, transition to Persist phase */
2470                         syncprov_sendinfo( op, rs, ( ss->ss_flags & SS_PRESENT ) ?
2471                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
2472                                 ( ss->ss_flags & SS_CHANGED ) ? &cookie : NULL,
2473                                 1, NULL, 0 );
2474                         if ( !BER_BVISNULL( &cookie ))
2475                                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2476
2477                         /* Detach this Op from frontend control */
2478                         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
2479
2480                         /* But not if this connection was closed along the way */
2481                         if ( op->o_abandon ) {
2482                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2483                                 /* syncprov_ab_cleanup will free this syncop */
2484                                 return SLAPD_ABANDON;
2485
2486                         } else {
2487                                 ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
2488                                 /* Turn off the refreshing flag */
2489                                 ss->ss_so->s_flags ^= PS_IS_REFRESHING;
2490
2491                                 syncprov_detach_op( op, ss->ss_so, on );
2492
2493                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2494
2495                                 /* If there are queued responses, fire them off */
2496                                 if ( ss->ss_so->s_res )
2497                                         syncprov_qstart( ss->ss_so );
2498                                 ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
2499                         }
2500
2501                         return LDAP_SUCCESS;
2502                 }
2503         }
2504
2505         return SLAP_CB_CONTINUE;
2506 }
2507
2508 static int
2509 syncprov_op_search( Operation *op, SlapReply *rs )
2510 {
2511         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2512         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2513         slap_callback   *cb;
2514         int gotstate = 0, changed = 0, do_present = 0;
2515         syncops *sop = NULL;
2516         searchstate *ss;
2517         sync_control *srs;
2518         BerVarray ctxcsn;
2519         int i, *sids, numcsns;
2520         struct berval mincsn, maxcsn;
2521         int minsid, maxsid;
2522         int dirty = 0;
2523
2524         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
2525
2526         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
2527                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
2528                 return rs->sr_err;
2529         }
2530
2531         srs = op->o_controls[slap_cids.sc_LDAPsync];
2532
2533         /* If this is a persistent search, set it up right away */
2534         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
2535                 syncops so = {0};
2536                 fbase_cookie fc;
2537                 opcookie opc;
2538                 slap_callback sc = {0};
2539
2540                 fc.fss = &so;
2541                 fc.fbase = 0;
2542                 so.s_eid = NOID;
2543                 so.s_op = op;
2544                 so.s_flags = PS_IS_REFRESHING | PS_FIND_BASE;
2545                 /* syncprov_findbase expects to be called as a callback... */
2546                 sc.sc_private = &opc;
2547                 opc.son = on;
2548                 ldap_pvt_thread_mutex_init( &so.s_mutex );
2549                 cb = op->o_callback;
2550                 op->o_callback = &sc;
2551                 rs->sr_err = syncprov_findbase( op, &fc );
2552                 op->o_callback = cb;
2553                 ldap_pvt_thread_mutex_destroy( &so.s_mutex );
2554
2555                 if ( rs->sr_err != LDAP_SUCCESS ) {
2556                         send_ldap_result( op, rs );
2557                         return rs->sr_err;
2558                 }
2559                 sop = ch_malloc( sizeof( syncops ));
2560                 *sop = so;
2561                 sop->s_rid = srs->sr_state.rid;
2562                 sop->s_sid = srs->sr_state.sid;
2563                 /* set refcount=2 to prevent being freed out from under us
2564                  * by abandons that occur while we're running here
2565                  */
2566                 sop->s_inuse = 2;
2567
2568                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2569                 while ( si->si_active ) {
2570                         /* Wait for active mods to finish before proceeding, as they
2571                          * may already have inspected the si_ops list looking for
2572                          * consumers to replicate the change to.  Using the log
2573                          * doesn't help, as we may finish playing it before the
2574                          * active mods gets added to it.
2575                          */
2576                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2577                         if ( slapd_shutdown ) {
2578                                 ch_free( sop );
2579                                 return SLAPD_ABANDON;
2580                         }
2581                         if ( !ldap_pvt_thread_pool_pausecheck( &connection_pool ))
2582                                 ldap_pvt_thread_yield();
2583                         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2584                 }
2585                 if ( op->o_abandon ) {
2586                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2587                         ch_free( sop );
2588                         return SLAPD_ABANDON;
2589                 }
2590                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
2591                 sop->s_next = si->si_ops;
2592                 sop->s_si = si;
2593                 si->si_ops = sop;
2594                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2595         }
2596
2597         /* snapshot the ctxcsn
2598          * Note: this must not be done before the psearch setup. (ITS#8365)
2599          */
2600         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2601         numcsns = si->si_numcsns;
2602         if ( numcsns ) {
2603                 ber_bvarray_dup_x( &ctxcsn, si->si_ctxcsn, op->o_tmpmemctx );
2604                 sids = op->o_tmpalloc( numcsns * sizeof(int), op->o_tmpmemctx );
2605                 for ( i=0; i<numcsns; i++ )
2606                         sids[i] = si->si_sids[i];
2607         } else {
2608                 ctxcsn = NULL;
2609                 sids = NULL;
2610         }
2611         dirty = si->si_dirty;
2612         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2613
2614         /* If we have a cookie, handle the PRESENT lookups */
2615         if ( srs->sr_state.ctxcsn ) {
2616                 sessionlog *sl;
2617                 int i, j;
2618
2619                 /* If we don't have any CSN of our own yet, bail out.
2620                  */
2621                 if ( !numcsns ) {
2622                         rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
2623                         rs->sr_text = "consumer has state info but provider doesn't!";
2624                         goto bailout;
2625                 }
2626
2627                 if ( !si->si_nopres )
2628                         do_present = SS_PRESENT;
2629
2630                 /* If there are SIDs we don't recognize in the cookie, drop them */
2631                 for (i=0; i<srs->sr_state.numcsns; ) {
2632                         for (j=i; j<numcsns; j++) {
2633                                 if ( srs->sr_state.sids[i] <= sids[j] ) {
2634                                         break;
2635                                 }
2636                         }
2637                         /* not found */
2638                         if ( j == numcsns || srs->sr_state.sids[i] != sids[j] ) {
2639                                 char *tmp = srs->sr_state.ctxcsn[i].bv_val;
2640                                 srs->sr_state.numcsns--;
2641                                 for ( j=i; j<srs->sr_state.numcsns; j++ ) {
2642                                         srs->sr_state.ctxcsn[j] = srs->sr_state.ctxcsn[j+1];
2643                                         srs->sr_state.sids[j] = srs->sr_state.sids[j+1];
2644                                 }
2645                                 srs->sr_state.ctxcsn[j].bv_val = tmp;
2646                                 srs->sr_state.ctxcsn[j].bv_len = 0;
2647                                 continue;
2648                         }
2649                         i++;
2650                 }
2651
2652                 if (srs->sr_state.numcsns != numcsns) {
2653                         /* consumer doesn't have the right number of CSNs */
2654                         changed = SS_CHANGED;
2655                         if ( srs->sr_state.ctxcsn ) {
2656                                 ber_bvarray_free_x( srs->sr_state.ctxcsn, op->o_tmpmemctx );
2657                                 srs->sr_state.ctxcsn = NULL;
2658                         }
2659                         if ( srs->sr_state.sids ) {
2660                                 slap_sl_free( srs->sr_state.sids, op->o_tmpmemctx );
2661                                 srs->sr_state.sids = NULL;
2662                         }
2663                         srs->sr_state.numcsns = 0;
2664                         goto shortcut;
2665                 }
2666
2667                 /* Find the smallest CSN which differs from contextCSN */
2668                 mincsn.bv_len = 0;
2669                 maxcsn.bv_len = 0;
2670                 for ( i=0,j=0; i<srs->sr_state.numcsns; i++ ) {
2671                         int newer;
2672                         while ( srs->sr_state.sids[i] != sids[j] ) j++;
2673                         if ( BER_BVISEMPTY( &maxcsn ) || ber_bvcmp( &maxcsn,
2674                                 &srs->sr_state.ctxcsn[i] ) < 0 ) {
2675                                 maxcsn = srs->sr_state.ctxcsn[i];
2676                                 maxsid = sids[j];
2677                         }
2678                         newer = ber_bvcmp( &srs->sr_state.ctxcsn[i], &ctxcsn[j] );
2679                         /* If our state is newer, tell consumer about changes */
2680                         if ( newer < 0) {
2681                                 changed = SS_CHANGED;
2682                                 if ( BER_BVISEMPTY( &mincsn ) || ber_bvcmp( &mincsn,
2683                                         &srs->sr_state.ctxcsn[i] ) > 0 ) {
2684                                         mincsn = srs->sr_state.ctxcsn[i];
2685                                         minsid = sids[j];
2686                                 }
2687                         } else if ( newer > 0 && sids[j] == slap_serverID ) {
2688                         /* our state is older, complain to consumer */
2689                                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
2690                                 rs->sr_text = "consumer state is newer than provider!";
2691                                 Log4( LDAP_DEBUG_SYNC, ldap_syslog_level,
2692                                         "consumer %d state %s is newer than provider %d state %s\n",
2693                                         sids[i], srs->sr_state.ctxcsn[i].bv_val, sids[j], /* == slap_serverID */
2694                                         ctxcsn[j].bv_val);
2695 bailout:
2696                                 if ( sop ) {
2697                                         syncops **sp = &si->si_ops;
2698
2699                                         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2700                                         while ( *sp != sop )
2701                                                 sp = &(*sp)->s_next;
2702                                         *sp = sop->s_next;
2703                                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2704                                         ch_free( sop );
2705                                 }
2706                                 rs->sr_ctrls = NULL;
2707                                 send_ldap_result( op, rs );
2708                                 return rs->sr_err;
2709                         }
2710                 }
2711                 if ( BER_BVISEMPTY( &mincsn )) {
2712                         mincsn = maxcsn;
2713                         minsid = maxsid;
2714                 }
2715
2716                 /* If nothing has changed, shortcut it */
2717                 if ( !changed && !dirty ) {
2718                         do_present = 0;
2719 no_change:      if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
2720                                 LDAPControl     *ctrls[2];
2721
2722                                 ctrls[0] = NULL;
2723                                 ctrls[1] = NULL;
2724                                 syncprov_done_ctrl( op, rs, ctrls, 0, 0,
2725                                         NULL, LDAP_SYNC_REFRESH_DELETES );
2726                                 rs->sr_ctrls = ctrls;
2727                                 rs->sr_err = LDAP_SUCCESS;
2728                                 send_ldap_result( op, rs );
2729                                 rs->sr_ctrls = NULL;
2730                                 return rs->sr_err;
2731                         }
2732                         goto shortcut;
2733                 }
2734
2735                 /* Do we have a sessionlog for this search? */
2736                 sl=si->si_logs;
2737                 if ( sl ) {
2738                         int do_play = 0;
2739                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
2740                         /* Are there any log entries, and is the consumer state
2741                          * present in the session log?
2742                          */
2743                         if ( sl->sl_num > 0 ) {
2744                                 int i;
2745                                 for ( i=0; i<sl->sl_numcsns; i++ ) {
2746                                         /* SID not present == new enough */
2747                                         if ( minsid < sl->sl_sids[i] ) {
2748                                                 do_play = 1;
2749                                                 break;
2750                                         }
2751                                         /* SID present */
2752                                         if ( minsid == sl->sl_sids[i] ) {
2753                                                 /* new enough? */
2754                                                 if ( ber_bvcmp( &mincsn, &sl->sl_mincsn[i] ) >= 0 )
2755                                                         do_play = 1;
2756                                                 break;
2757                                         }
2758                                 }
2759                                 /* SID not present == new enough */
2760                                 if ( i == sl->sl_numcsns )
2761                                         do_play = 1;
2762                         }
2763                         if ( do_play ) {
2764                                 do_present = 0;
2765                                 /* mutex is unlocked in playlog */
2766                                 syncprov_playlog( op, rs, sl, srs, ctxcsn, numcsns, sids );
2767                         } else {
2768                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
2769                         }
2770                 }
2771                 /* Is the CSN still present in the database? */
2772                 if ( syncprov_findcsn( op, FIND_CSN, &mincsn ) != LDAP_SUCCESS ) {
2773                         /* No, so a reload is required */
2774                         /* the 2.2 consumer doesn't send this hint */
2775                         if ( si->si_usehint && srs->sr_rhint == 0 ) {
2776                                 if ( ctxcsn )
2777                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2778                                 if ( sids )
2779                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2780                                 rs->sr_err = LDAP_SYNC_REFRESH_REQUIRED;
2781                                 rs->sr_text = "sync cookie is stale";
2782                                 goto bailout;
2783                         }
2784                         if ( srs->sr_state.ctxcsn ) {
2785                                 ber_bvarray_free_x( srs->sr_state.ctxcsn, op->o_tmpmemctx );
2786                                 srs->sr_state.ctxcsn = NULL;
2787                         }
2788                         if ( srs->sr_state.sids ) {
2789                                 slap_sl_free( srs->sr_state.sids, op->o_tmpmemctx );
2790                                 srs->sr_state.sids = NULL;
2791                         }
2792                         srs->sr_state.numcsns = 0;
2793                 } else {
2794                         gotstate = 1;
2795                         /* If changed and doing Present lookup, send Present UUIDs */
2796                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT, 0 ) !=
2797                                 LDAP_SUCCESS ) {
2798                                 if ( ctxcsn )
2799                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2800                                 if ( sids )
2801                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2802                                 goto bailout;
2803                         }
2804                 }
2805         } else {
2806                 /* The consumer knows nothing, we know nothing. OK. */
2807                 if (!numcsns)
2808                         goto no_change;
2809                 /* No consumer state, assume something has changed */
2810                 changed = SS_CHANGED;
2811         }
2812
2813 shortcut:
2814         /* Append CSN range to search filter, save original filter
2815          * for persistent search evaluation
2816          */
2817         if ( sop ) {
2818                 ldap_pvt_thread_mutex_lock( &sop->s_mutex );
2819                 sop->s_filterstr = op->ors_filterstr;
2820                 /* correct the refcount that was set to 2 before */
2821                 sop->s_inuse--;
2822         }
2823
2824         /* If something changed, find the changes */
2825         if ( gotstate && ( changed || dirty ) ) {
2826                 Filter *fand, *fava;
2827
2828                 fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2829                 fand->f_choice = LDAP_FILTER_AND;
2830                 fand->f_next = NULL;
2831                 fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2832                 fand->f_and = fava;
2833                 fava->f_choice = LDAP_FILTER_GE;
2834                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
2835                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
2836 #ifdef LDAP_COMP_MATCH
2837                 fava->f_ava->aa_cf = NULL;
2838 #endif
2839                 ber_dupbv_x( &fava->f_ava->aa_value, &mincsn, op->o_tmpmemctx );
2840                 fava->f_next = op->ors_filter;
2841                 op->ors_filter = fand;
2842                 filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
2843                 if ( sop ) {
2844                         sop->s_flags |= PS_FIX_FILTER;
2845                 }
2846         }
2847         if ( sop ) {
2848                 ldap_pvt_thread_mutex_unlock( &sop->s_mutex );
2849         }
2850
2851         /* Let our callback add needed info to returned entries */
2852         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
2853         ss = (searchstate *)(cb+1);
2854         ss->ss_on = on;
2855         ss->ss_so = sop;
2856         ss->ss_flags = do_present | changed;
2857         ss->ss_ctxcsn = ctxcsn;
2858         ss->ss_numcsns = numcsns;
2859         ss->ss_sids = sids;
2860         cb->sc_response = syncprov_search_response;
2861         cb->sc_private = ss;
2862         cb->sc_next = op->o_callback;
2863         op->o_callback = cb;
2864
2865         /* If this is a persistent search and no changes were reported during
2866          * the refresh phase, just invoke the response callback to transition
2867          * us into persist phase
2868          */
2869         if ( !changed && !dirty ) {
2870                 rs->sr_err = LDAP_SUCCESS;
2871                 rs->sr_nentries = 0;
2872                 send_ldap_result( op, rs );
2873                 return rs->sr_err;
2874         }
2875         return SLAP_CB_CONTINUE;
2876 }
2877
2878 static int
2879 syncprov_operational(
2880         Operation *op,
2881         SlapReply *rs )
2882 {
2883         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2884         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2885
2886         /* This prevents generating unnecessarily; frontend will strip
2887          * any statically stored copy.
2888          */
2889         if ( op->o_sync != SLAP_CONTROL_NONE )
2890                 return SLAP_CB_CONTINUE;
2891
2892         if ( rs->sr_entry &&
2893                 dn_match( &rs->sr_entry->e_nname, &si->si_contextdn )) {
2894
2895                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
2896                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
2897                         Attribute *a, **ap = NULL;
2898
2899                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
2900                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
2901                                         break;
2902                         }
2903
2904                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2905                         if ( si->si_ctxcsn ) {
2906                                 if ( !a ) {
2907                                         for ( ap = &rs->sr_operational_attrs; *ap;
2908                                                 ap=&(*ap)->a_next );
2909
2910                                         a = attr_alloc( slap_schema.si_ad_contextCSN );
2911                                         *ap = a;
2912                                 }
2913
2914                                 if ( !ap ) {
2915                                         if ( rs_entry2modifiable( op, rs, on )) {
2916                                                 a = attr_find( rs->sr_entry->e_attrs,
2917                                                         slap_schema.si_ad_contextCSN );
2918                                         }
2919                                         if ( a->a_nvals != a->a_vals ) {
2920                                                 ber_bvarray_free( a->a_nvals );
2921                                         }
2922                                         a->a_nvals = NULL;
2923                                         ber_bvarray_free( a->a_vals );
2924                                         a->a_vals = NULL;
2925                                         a->a_numvals = 0;
2926                                 }
2927                                 attr_valadd( a, si->si_ctxcsn, si->si_ctxcsn, si->si_numcsns );
2928                         }
2929                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2930                 }
2931         }
2932         return SLAP_CB_CONTINUE;
2933 }
2934
2935 enum {
2936         SP_CHKPT = 1,
2937         SP_SESSL,
2938         SP_NOPRES,
2939         SP_USEHINT
2940 };
2941
2942 static ConfigDriver sp_cf_gen;
2943
2944 static ConfigTable spcfg[] = {
2945         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2946                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2947                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2948                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2949         { "syncprov-sessionlog", "ops", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2950                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2951                         "DESC 'Session log size in ops' "
2952                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2953         { "syncprov-nopresent", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_NOPRES,
2954                 sp_cf_gen, "( OLcfgOvAt:1.3 NAME 'olcSpNoPresent' "
2955                         "DESC 'Omit Present phase processing' "
2956                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2957         { "syncprov-reloadhint", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_USEHINT,
2958                 sp_cf_gen, "( OLcfgOvAt:1.4 NAME 'olcSpReloadHint' "
2959                         "DESC 'Observe Reload Hint in Request control' "
2960                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2961         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2962 };
2963
2964 static ConfigOCs spocs[] = {
2965         { "( OLcfgOvOc:1.1 "
2966                 "NAME 'olcSyncProvConfig' "
2967                 "DESC 'SyncRepl Provider configuration' "
2968                 "SUP olcOverlayConfig "
2969                 "MAY ( olcSpCheckpoint "
2970                         "$ olcSpSessionlog "
2971                         "$ olcSpNoPresent "
2972                         "$ olcSpReloadHint "
2973                 ") )",
2974                         Cft_Overlay, spcfg },
2975         { NULL, 0, NULL }
2976 };
2977
2978 static int
2979 sp_cf_gen(ConfigArgs *c)
2980 {
2981         slap_overinst           *on = (slap_overinst *)c->bi;
2982         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2983         int rc = 0;
2984
2985         if ( c->op == SLAP_CONFIG_EMIT ) {
2986                 switch ( c->type ) {
2987                 case SP_CHKPT:
2988                         if ( si->si_chkops || si->si_chktime ) {
2989                                 struct berval bv;
2990                                 /* we assume si_chktime is a multiple of 60
2991                                  * because the parsed value was originally
2992                                  * multiplied by 60 */
2993                                 bv.bv_len = snprintf( c->cr_msg, sizeof( c->cr_msg ),
2994                                         "%d %d", si->si_chkops, si->si_chktime/60 );
2995                                 if ( bv.bv_len >= sizeof( c->cr_msg ) ) {
2996                                         rc = 1;
2997                                 } else {
2998                                         bv.bv_val = c->cr_msg;
2999                                         value_add_one( &c->rvalue_vals, &bv );
3000                                 }
3001                         } else {
3002                                 rc = 1;
3003                         }
3004                         break;
3005                 case SP_SESSL:
3006                         if ( si->si_logs ) {
3007                                 c->value_int = si->si_logs->sl_size;
3008                         } else {
3009                                 rc = 1;
3010                         }
3011                         break;
3012                 case SP_NOPRES:
3013                         if ( si->si_nopres ) {
3014                                 c->value_int = 1;
3015                         } else {
3016                                 rc = 1;
3017                         }
3018                         break;
3019                 case SP_USEHINT:
3020                         if ( si->si_usehint ) {
3021                                 c->value_int = 1;
3022                         } else {
3023                                 rc = 1;
3024                         }
3025                         break;
3026                 }
3027                 return rc;
3028         } else if ( c->op == LDAP_MOD_DELETE ) {
3029                 switch ( c->type ) {
3030                 case SP_CHKPT:
3031                         si->si_chkops = 0;
3032                         si->si_chktime = 0;
3033                         break;
3034                 case SP_SESSL:
3035                         if ( si->si_logs )
3036                                 si->si_logs->sl_size = 0;
3037                         else
3038                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
3039                         break;
3040                 case SP_NOPRES:
3041                         if ( si->si_nopres )
3042                                 si->si_nopres = 0;
3043                         else
3044                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
3045                         break;
3046                 case SP_USEHINT:
3047                         if ( si->si_usehint )
3048                                 si->si_usehint = 0;
3049                         else
3050                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
3051                         break;
3052                 }
3053                 return rc;
3054         }
3055         switch ( c->type ) {
3056         case SP_CHKPT:
3057                 if ( lutil_atoi( &si->si_chkops, c->argv[1] ) != 0 ) {
3058                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint ops # \"%s\"",
3059                                 c->argv[0], c->argv[1] );
3060                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
3061                                 "%s: %s\n", c->log, c->cr_msg, 0 );
3062                         return ARG_BAD_CONF;
3063                 }
3064                 if ( si->si_chkops <= 0 ) {
3065                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint ops # \"%d\"",
3066                                 c->argv[0], si->si_chkops );
3067                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
3068                                 "%s: %s\n", c->log, c->cr_msg, 0 );
3069                         return ARG_BAD_CONF;
3070                 }
3071                 if ( lutil_atoi( &si->si_chktime, c->argv[2] ) != 0 ) {
3072                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint time \"%s\"",
3073                                 c->argv[0], c->argv[1] );
3074                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
3075                                 "%s: %s\n", c->log, c->cr_msg, 0 );
3076                         return ARG_BAD_CONF;
3077                 }
3078                 if ( si->si_chktime <= 0 ) {
3079                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint time \"%d\"",
3080                                 c->argv[0], si->si_chkops );
3081                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
3082                                 "%s: %s\n", c->log, c->cr_msg, 0 );
3083                         return ARG_BAD_CONF;
3084                 }
3085                 si->si_chktime *= 60;
3086                 break;
3087         case SP_SESSL: {
3088                 sessionlog *sl;
3089                 int size = c->value_int;
3090
3091                 if ( size < 0 ) {
3092                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s size %d is negative",
3093                                 c->argv[0], size );
3094                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
3095                                 "%s: %s\n", c->log, c->cr_msg, 0 );
3096                         return ARG_BAD_CONF;
3097                 }
3098                 sl = si->si_logs;
3099                 if ( !sl ) {
3100                         sl = ch_malloc( sizeof( sessionlog ));
3101                         sl->sl_mincsn = NULL;
3102                         sl->sl_sids = NULL;
3103                         sl->sl_num = 0;
3104                         sl->sl_numcsns = 0;
3105                         sl->sl_head = sl->sl_tail = NULL;
3106                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
3107                         si->si_logs = sl;
3108                 }
3109                 sl->sl_size = size;
3110                 }
3111                 break;
3112         case SP_NOPRES:
3113                 si->si_nopres = c->value_int;
3114                 break;
3115         case SP_USEHINT:
3116                 si->si_usehint = c->value_int;
3117                 break;
3118         }
3119         return rc;
3120 }
3121
3122 /* ITS#3456 we cannot run this search on the main thread, must use a
3123  * child thread in order to insure we have a big enough stack.
3124  */
3125 static void *
3126 syncprov_db_otask(
3127         void *ptr
3128 )
3129 {
3130         syncprov_findcsn( ptr, FIND_MAXCSN, 0 );
3131         return NULL;
3132 }
3133
3134
3135 /* Read any existing contextCSN from the underlying db.
3136  * Then search for any entries newer than that. If no value exists,
3137  * just generate it. Cache whatever result.
3138  */
3139 static int
3140 syncprov_db_open(
3141         BackendDB *be,
3142         ConfigReply *cr
3143 )
3144 {
3145         slap_overinst   *on = (slap_overinst *) be->bd_info;
3146         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3147
3148         Connection conn = { 0 };
3149         OperationBuffer opbuf;
3150         Operation *op;
3151         Entry *e = NULL;
3152         Attribute *a;
3153         int rc;
3154         void *thrctx = NULL;
3155
3156         if ( !SLAP_LASTMOD( be )) {
3157                 Debug( LDAP_DEBUG_ANY,
3158                         "syncprov_db_open: invalid config, lastmod must be enabled\n", 0, 0, 0 );
3159                 return -1;
3160         }
3161
3162         if ( slapMode & SLAP_TOOL_MODE ) {
3163                 return 0;
3164         }
3165
3166         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
3167         if ( rc ) {
3168                 return rc;
3169         }
3170
3171         thrctx = ldap_pvt_thread_pool_context();
3172         connection_fake_init2( &conn, &opbuf, thrctx, 0 );
3173         op = &opbuf.ob_op;
3174         op->o_bd = be;
3175         op->o_dn = be->be_rootdn;
3176         op->o_ndn = be->be_rootndn;
3177
3178         if ( SLAP_SYNC_SUBENTRY( be )) {
3179                 build_new_dn( &si->si_contextdn, be->be_nsuffix,
3180                         (struct berval *)&slap_ldapsync_cn_bv, NULL );
3181         } else {
3182                 si->si_contextdn = be->be_nsuffix[0];
3183         }
3184         rc = overlay_entry_get_ov( op, &si->si_contextdn, NULL,
3185                 slap_schema.si_ad_contextCSN, 0, &e, on );
3186
3187         if ( e ) {
3188                 ldap_pvt_thread_t tid;
3189
3190                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
3191                 if ( a ) {
3192                         ber_bvarray_dup_x( &si->si_ctxcsn, a->a_vals, NULL );
3193                         si->si_numcsns = a->a_numvals;
3194                         si->si_sids = slap_parse_csn_sids( si->si_ctxcsn, a->a_numvals, NULL );
3195                         slap_sort_csn_sids( si->si_ctxcsn, si->si_sids, si->si_numcsns, NULL );
3196                 }
3197                 overlay_entry_release_ov( op, e, 0, on );
3198                 if ( si->si_ctxcsn && !SLAP_DBCLEAN( be )) {
3199                         op->o_tag = LDAP_REQ_SEARCH;
3200                         op->o_req_dn = be->be_suffix[0];
3201                         op->o_req_ndn = be->be_nsuffix[0];
3202                         op->ors_scope = LDAP_SCOPE_SUBTREE;
3203                         ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
3204                         ldap_pvt_thread_join( tid, NULL );
3205                 }
3206         }
3207
3208         /* Didn't find a contextCSN, should we generate one? */
3209         if ( !si->si_ctxcsn ) {
3210                 char csnbuf[ LDAP_PVT_CSNSTR_BUFSIZE ];
3211                 struct berval csn;
3212
3213                 if ( slap_serverID || SLAP_SYNC_SHADOW( op->o_bd )) {
3214                 /* If we're also a consumer, then don't generate anything.
3215                  * Wait for our provider to send it to us, or for a local
3216                  * modify if we have multimaster.
3217                  */
3218                         goto out;
3219                 }
3220                 csn.bv_val = csnbuf;
3221                 csn.bv_len = sizeof( csnbuf );
3222                 slap_get_csn( op, &csn, 0 );
3223                 value_add_one( &si->si_ctxcsn, &csn );
3224                 si->si_numcsns = 1;
3225                 si->si_sids = ch_malloc( sizeof(int) );
3226                 si->si_sids[0] = slap_serverID;
3227
3228                 /* make sure we do a checkpoint on close */
3229                 si->si_numops++;
3230         }
3231
3232         /* Initialize the sessionlog mincsn */
3233         if ( si->si_logs && si->si_numcsns ) {
3234                 sessionlog *sl = si->si_logs;
3235                 int i;
3236                 ber_bvarray_dup_x( &sl->sl_mincsn, si->si_ctxcsn, NULL );
3237                 sl->sl_numcsns = si->si_numcsns;
3238                 sl->sl_sids = ch_malloc( si->si_numcsns * sizeof(int) );
3239                 for ( i=0; i < si->si_numcsns; i++ )
3240                         sl->sl_sids[i] = si->si_sids[i];
3241         }
3242
3243 out:
3244         op->o_bd->bd_info = (BackendInfo *)on;
3245         return 0;
3246 }
3247
3248 /* Write the current contextCSN into the underlying db.
3249  */
3250 static int
3251 syncprov_db_close(
3252         BackendDB *be,
3253         ConfigReply *cr
3254 )
3255 {
3256         slap_overinst   *on = (slap_overinst *) be->bd_info;
3257         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3258 #ifdef SLAP_CONFIG_DELETE
3259         syncops *so, *sonext;
3260 #endif /* SLAP_CONFIG_DELETE */
3261
3262         if ( slapMode & SLAP_TOOL_MODE ) {
3263                 return 0;
3264         }
3265         if ( si->si_numops ) {
3266                 Connection conn = {0};
3267                 OperationBuffer opbuf;
3268                 Operation *op;
3269                 void *thrctx;
3270
3271                 thrctx = ldap_pvt_thread_pool_context();
3272                 connection_fake_init2( &conn, &opbuf, thrctx, 0 );
3273                 op = &opbuf.ob_op;
3274                 op->o_bd = be;
3275                 op->o_dn = be->be_rootdn;
3276                 op->o_ndn = be->be_rootndn;
3277                 syncprov_checkpoint( op, on );
3278         }
3279
3280 #ifdef SLAP_CONFIG_DELETE
3281         if ( !slapd_shutdown ) {
3282                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
3283                 for ( so=si->si_ops, sonext=so;  so; so=sonext  ) {
3284                         SlapReply rs = {REP_RESULT};
3285                         rs.sr_err = LDAP_UNAVAILABLE;
3286                         send_ldap_result( so->s_op, &rs );
3287                         sonext=so->s_next;
3288                         if ( so->s_flags & PS_TASK_QUEUED )
3289                                 ldap_pvt_thread_pool_retract( so->s_pool_cookie );
3290                         if ( !syncprov_drop_psearch( so, 0 ))
3291                                 so->s_si = NULL;
3292                 }
3293                 si->si_ops=NULL;
3294                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
3295         }
3296         overlay_unregister_control( be, LDAP_CONTROL_SYNC );
3297 #endif /* SLAP_CONFIG_DELETE */
3298
3299         return 0;
3300 }
3301
3302 static int
3303 syncprov_db_init(
3304         BackendDB *be,
3305         ConfigReply *cr
3306 )
3307 {
3308         slap_overinst   *on = (slap_overinst *)be->bd_info;
3309         syncprov_info_t *si;
3310
3311         if ( SLAP_ISGLOBALOVERLAY( be ) ) {
3312                 Debug( LDAP_DEBUG_ANY,
3313                         "syncprov must be instantiated within a database.\n",
3314                         0, 0, 0 );
3315                 return 1;
3316         }
3317
3318         si = ch_calloc(1, sizeof(syncprov_info_t));
3319         on->on_bi.bi_private = si;
3320         ldap_pvt_thread_rdwr_init( &si->si_csn_rwlock );
3321         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
3322         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
3323         ldap_pvt_thread_mutex_init( &si->si_resp_mutex );
3324
3325         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
3326         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
3327         csn_anlist[1].an_desc = slap_schema.si_ad_entryUUID;
3328         csn_anlist[1].an_name = slap_schema.si_ad_entryUUID->ad_cname;
3329
3330         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
3331         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
3332
3333         return 0;
3334 }
3335
3336 static int
3337 syncprov_db_destroy(
3338         BackendDB *be,
3339         ConfigReply *cr
3340 )
3341 {
3342         slap_overinst   *on = (slap_overinst *)be->bd_info;
3343         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3344
3345         if ( si ) {
3346                 if ( si->si_logs ) {
3347                         sessionlog *sl = si->si_logs;
3348                         slog_entry *se = sl->sl_head;
3349
3350                         while ( se ) {
3351                                 slog_entry *se_next = se->se_next;
3352                                 ch_free( se );
3353                                 se = se_next;
3354                         }
3355                         if ( sl->sl_mincsn )
3356                                 ber_bvarray_free( sl->sl_mincsn );
3357                         if ( sl->sl_sids )
3358                                 ch_free( sl->sl_sids );
3359
3360                         ldap_pvt_thread_mutex_destroy(&si->si_logs->sl_mutex);
3361                         ch_free( si->si_logs );
3362                 }
3363                 if ( si->si_ctxcsn )
3364                         ber_bvarray_free( si->si_ctxcsn );
3365                 if ( si->si_sids )
3366                         ch_free( si->si_sids );
3367                 ldap_pvt_thread_mutex_destroy( &si->si_resp_mutex );
3368                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
3369                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
3370                 ldap_pvt_thread_rdwr_destroy( &si->si_csn_rwlock );
3371                 ch_free( si );
3372         }
3373
3374         return 0;
3375 }
3376
3377 static int syncprov_parseCtrl (
3378         Operation *op,
3379         SlapReply *rs,
3380         LDAPControl *ctrl )
3381 {
3382         ber_tag_t tag;
3383         BerElementBuffer berbuf;
3384         BerElement *ber = (BerElement *)&berbuf;
3385         ber_int_t mode;
3386         ber_len_t len;
3387         struct berval cookie = BER_BVNULL;
3388         sync_control *sr;
3389         int rhint = 0;
3390
3391         if ( op->o_sync != SLAP_CONTROL_NONE ) {
3392                 rs->sr_text = "Sync control specified multiple times";
3393                 return LDAP_PROTOCOL_ERROR;
3394         }
3395
3396         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
3397                 rs->sr_text = "Sync control specified with pagedResults control";
3398                 return LDAP_PROTOCOL_ERROR;
3399         }
3400
3401         if ( BER_BVISNULL( &ctrl->ldctl_value ) ) {
3402                 rs->sr_text = "Sync control value is absent";
3403                 return LDAP_PROTOCOL_ERROR;
3404         }
3405
3406         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
3407                 rs->sr_text = "Sync control value is empty";
3408                 return LDAP_PROTOCOL_ERROR;
3409         }
3410
3411         /* Parse the control value
3412          *      syncRequestValue ::= SEQUENCE {
3413          *              mode   ENUMERATED {
3414          *                      -- 0 unused
3415          *                      refreshOnly             (1),
3416          *                      -- 2 reserved
3417          *                      refreshAndPersist       (3)
3418          *              },
3419          *              cookie  syncCookie OPTIONAL
3420          *      }
3421          */
3422
3423         ber_init2( ber, &ctrl->ldctl_value, 0 );
3424
3425         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
3426                 rs->sr_text = "Sync control : mode decoding error";
3427                 return LDAP_PROTOCOL_ERROR;
3428         }
3429
3430         switch( mode ) {
3431         case LDAP_SYNC_REFRESH_ONLY:
3432                 mode = SLAP_SYNC_REFRESH;
3433                 break;
3434         case LDAP_SYNC_REFRESH_AND_PERSIST:
3435                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
3436                 break;
3437         default:
3438                 rs->sr_text = "Sync control : unknown update mode";
3439                 return LDAP_PROTOCOL_ERROR;
3440         }
3441
3442         tag = ber_peek_tag( ber, &len );
3443
3444         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
3445                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
3446                         rs->sr_text = "Sync control : cookie decoding error";
3447                         return LDAP_PROTOCOL_ERROR;
3448                 }
3449                 tag = ber_peek_tag( ber, &len );
3450         }
3451         if ( tag == LDAP_TAG_RELOAD_HINT ) {
3452                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
3453                         rs->sr_text = "Sync control : rhint decoding error";
3454                         return LDAP_PROTOCOL_ERROR;
3455                 }
3456         }
3457         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
3458                         rs->sr_text = "Sync control : decoding error";
3459                         return LDAP_PROTOCOL_ERROR;
3460         }
3461         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
3462         sr->sr_rhint = rhint;
3463         if (!BER_BVISNULL(&cookie)) {
3464                 ber_dupbv_x( &sr->sr_state.octet_str, &cookie, op->o_tmpmemctx );
3465                 /* If parse fails, pretend no cookie was sent */
3466                 if ( slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx ) ||
3467                         sr->sr_state.rid == -1 ) {
3468                         if ( sr->sr_state.ctxcsn ) {
3469                                 ber_bvarray_free_x( sr->sr_state.ctxcsn, op->o_tmpmemctx );
3470                                 sr->sr_state.ctxcsn = NULL;
3471                         }
3472                         sr->sr_state.numcsns = 0;
3473                 }
3474         }
3475
3476         op->o_controls[slap_cids.sc_LDAPsync] = sr;
3477
3478         op->o_sync = ctrl->ldctl_iscritical
3479                 ? SLAP_CONTROL_CRITICAL
3480                 : SLAP_CONTROL_NONCRITICAL;
3481
3482         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
3483
3484         return LDAP_SUCCESS;
3485 }
3486
3487 /* This overlay is set up for dynamic loading via moduleload. For static
3488  * configuration, you'll need to arrange for the slap_overinst to be
3489  * initialized and registered by some other function inside slapd.
3490  */
3491
3492 static slap_overinst            syncprov;
3493
3494 int
3495 syncprov_initialize()
3496 {
3497         int rc;
3498
3499         rc = register_supported_control( LDAP_CONTROL_SYNC,
3500                 SLAP_CTRL_SEARCH, NULL,
3501                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
3502         if ( rc != LDAP_SUCCESS ) {
3503                 Debug( LDAP_DEBUG_ANY,
3504                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
3505                 return rc;
3506         }
3507
3508         syncprov.on_bi.bi_type = "syncprov";
3509         syncprov.on_bi.bi_db_init = syncprov_db_init;
3510         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
3511         syncprov.on_bi.bi_db_open = syncprov_db_open;
3512         syncprov.on_bi.bi_db_close = syncprov_db_close;
3513
3514         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
3515         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
3516
3517         syncprov.on_bi.bi_op_add = syncprov_op_mod;
3518         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
3519         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
3520         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
3521         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
3522         syncprov.on_bi.bi_op_search = syncprov_op_search;
3523         syncprov.on_bi.bi_extended = syncprov_op_extended;
3524         syncprov.on_bi.bi_operational = syncprov_operational;
3525
3526         syncprov.on_bi.bi_cf_ocs = spocs;
3527
3528         generic_filter.f_desc = slap_schema.si_ad_objectClass;
3529
3530         rc = config_register_schema( spcfg, spocs );
3531         if ( rc ) return rc;
3532
3533         return overlay_register( &syncprov );
3534 }
3535
3536 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
3537 int
3538 init_module( int argc, char *argv[] )
3539 {
3540         return syncprov_initialize();
3541 }
3542 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
3543
3544 #endif /* defined(SLAPD_OVER_SYNCPROV) */