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