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 2004-2009 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         struct berval s_dn;
  52         struct berval s_ndn;
  53         struct berval s_uuid;
  54         struct berval s_csn;
  55         char s_mode;
  56         char s_isreference;
  57 } syncres;
  58
  59 /* Record of a persistent search */
  60 typedef struct syncops {
  61         struct syncops *s_next;
  62         struct berval   s_base;         /* ndn of search base */
  63         ID              s_eid;          /* entryID of search base */
  64         Operation       *s_op;          /* search op */
  65         int             s_rid;
  66         int             s_sid;
  67         struct berval s_filterstr;
  68         int             s_flags;        /* search status */
  69 #define PS_IS_REFRESHING        0x01
  70 #define PS_IS_DETACHED          0x02
  71 #define PS_WROTE_BASE           0x04
  72 #define PS_FIND_BASE            0x08
  73 #define PS_FIX_FILTER           0x10
  74 #define PS_TASK_QUEUED          0x20
  75
  76         int             s_inuse;        /* reference count */
  77         struct syncres *s_res;
  78         struct syncres *s_restail;
  79         ldap_pvt_thread_mutex_t s_mutex;
  80 } syncops;
  81
  82 /* A received sync control */
  83 typedef struct sync_control {
  84         struct sync_cookie sr_state;
  85         int sr_rhint;
  86 } sync_control;
  87
  88 #if 0 /* moved back to slap.h */
  89 #define o_sync  o_ctrlflag[slap_cids.sc_LDAPsync]
  90 #endif
  91 /* o_sync_mode uses data bits of o_sync */
  92 #define o_sync_mode     o_ctrlflag[slap_cids.sc_LDAPsync]
  93
  94 #define SLAP_SYNC_NONE                                  (LDAP_SYNC_NONE<<SLAP_CONTROL_SHIFT)
  95 #define SLAP_SYNC_REFRESH                               (LDAP_SYNC_REFRESH_ONLY<<SLAP_CONTROL_SHIFT)
  96 #define SLAP_SYNC_PERSIST                               (LDAP_SYNC_RESERVED<<SLAP_CONTROL_SHIFT)
  97 #define SLAP_SYNC_REFRESH_AND_PERSIST   (LDAP_SYNC_REFRESH_AND_PERSIST<<SLAP_CONTROL_SHIFT)
  98
  99 /* Record of which searches matched at premodify step */
 100 typedef struct syncmatches {
 101         struct syncmatches *sm_next;
 102         syncops *sm_op;
 103 } syncmatches;
 104
 105 /* Session log data */
 106 typedef struct slog_entry {
 107         struct slog_entry *se_next;
 108         struct berval se_uuid;
 109         struct berval se_csn;
 110         int     se_sid;
 111         ber_tag_t       se_tag;
 112 } slog_entry;
 113
 114 typedef struct sessionlog {
 115         struct berval   sl_mincsn;
 116         int             sl_num;
 117         int             sl_size;
 118         slog_entry *sl_head;
 119         slog_entry *sl_tail;
 120         ldap_pvt_thread_mutex_t sl_mutex;
 121 } sessionlog;
 122
 123 /* The main state for this overlay */
 124 typedef struct syncprov_info_t {
 125         syncops         *si_ops;
 126         BerVarray       si_ctxcsn;      /* ldapsync context */
 127         struct berval   si_contextdn;
 128         int             *si_sids;
 129         int             si_numcsns;
 130         int             si_chkops;      /* checkpointing info */
 131         int             si_chktime;
 132         int             si_numops;      /* number of ops since last checkpoint */
 133         int             si_nopres;      /* Skip present phase */
 134         int             si_usehint;     /* use reload hint */
 135         time_t  si_chklast;     /* time of last checkpoint */
 136         Avlnode *si_mods;       /* entries being modified */
 137         sessionlog      *si_logs;
 138         ldap_pvt_thread_rdwr_t  si_csn_rwlock;
 139         ldap_pvt_thread_mutex_t si_ops_mutex;
 140         ldap_pvt_thread_mutex_t si_mods_mutex;
 141         ldap_pvt_thread_mutex_t si_resp_mutex;
 142 } syncprov_info_t;
 143
 144 typedef struct opcookie {
 145         slap_overinst *son;
 146         syncmatches *smatches;
 147         modtarget *smt;
 148         struct berval sdn;      /* DN of entry, for deletes */
 149         struct berval sndn;
 150         struct berval suuid;    /* UUID of entry */
 151         struct berval sctxcsn;
 152         short osid;     /* sid of op csn */
 153         short rsid;     /* sid of relay */
 154         short sreference;       /* Is the entry a reference? */
 155 } opcookie;
 156
 157 typedef struct fbase_cookie {
 158         struct berval *fdn;     /* DN of a modified entry, for scope testing */
 159         syncops *fss;   /* persistent search we're testing against */
 160         int fbase;      /* if TRUE we found the search base and it's still valid */
 161         int fscope;     /* if TRUE then fdn is within the psearch scope */
 162 } fbase_cookie;
 163
 164 static AttributeName csn_anlist[3];
 165 static AttributeName uuid_anlist[2];
 166
 167 /* Build a LDAPsync intermediate state control */
 168 static int
 169 syncprov_state_ctrl(
 170         Operation       *op,
 171         SlapReply       *rs,
 172         Entry           *e,
 173         int             entry_sync_state,
 174         LDAPControl     **ctrls,
 175         int             num_ctrls,
 176         int             send_cookie,
 177         struct berval   *cookie )
 178 {
 179         Attribute* a;
 180         int ret;
 181
 182         BerElementBuffer berbuf;
 183         BerElement *ber = (BerElement *)&berbuf;
 184
 185         struct berval   entryuuid_bv = BER_BVNULL;
 186
 187         ber_init2( ber, 0, LBER_USE_DER );
 188         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 189
 190         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 191
 192         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 193                 AttributeDescription *desc = a->a_desc;
 194                 if ( desc == slap_schema.si_ad_entryUUID ) {
 195                         entryuuid_bv = a->a_nvals[0];
 196                         break;
 197                 }
 198         }
 199
 200         /* FIXME: what if entryuuid is NULL or empty ? */
 201
 202         if ( send_cookie && cookie ) {
 203                 ber_printf( ber, "{eOON}",
 204                         entry_sync_state, &entryuuid_bv, cookie );
 205         } else {
 206                 ber_printf( ber, "{eON}",
 207                         entry_sync_state, &entryuuid_bv );
 208         }
 209
 210         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 211         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 212         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 213
 214         ber_free_buf( ber );
 215
 216         if ( ret < 0 ) {
 217                 Debug( LDAP_DEBUG_TRACE,
 218                         "slap_build_sync_ctrl: ber_flatten2 failed\n",
 219                         0, 0, 0 );
 220                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 221                 return ret;
 222         }
 223
 224         return LDAP_SUCCESS;
 225 }
 226
 227 /* Build a LDAPsync final state control */
 228 static int
 229 syncprov_done_ctrl(
 230         Operation       *op,
 231         SlapReply       *rs,
 232         LDAPControl     **ctrls,
 233         int                     num_ctrls,
 234         int                     send_cookie,
 235         struct berval *cookie,
 236         int                     refreshDeletes )
 237 {
 238         int ret;
 239         BerElementBuffer berbuf;
 240         BerElement *ber = (BerElement *)&berbuf;
 241
 242         ber_init2( ber, NULL, LBER_USE_DER );
 243         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 244
 245         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 246
 247         ber_printf( ber, "{" );
 248         if ( send_cookie && cookie ) {
 249                 ber_printf( ber, "O", cookie );
 250         }
 251         if ( refreshDeletes == LDAP_SYNC_REFRESH_DELETES ) {
 252                 ber_printf( ber, "b", refreshDeletes );
 253         }
 254         ber_printf( ber, "N}" );
 255
 256         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_DONE;
 257         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 258         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 259
 260         ber_free_buf( ber );
 261
 262         if ( ret < 0 ) {
 263                 Debug( LDAP_DEBUG_TRACE,
 264                         "syncprov_done_ctrl: ber_flatten2 failed\n",
 265                         0, 0, 0 );
 266                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 267                 return ret;
 268         }
 269
 270         return LDAP_SUCCESS;
 271 }
 272
 273 static int
 274 syncprov_sendinfo(
 275         Operation       *op,
 276         SlapReply       *rs,
 277         int                     type,
 278         struct berval *cookie,
 279         int                     refreshDone,
 280         BerVarray       syncUUIDs,
 281         int                     refreshDeletes )
 282 {
 283         BerElementBuffer berbuf;
 284         BerElement *ber = (BerElement *)&berbuf;
 285         struct berval rspdata;
 286
 287         int ret;
 288
 289         ber_init2( ber, NULL, LBER_USE_DER );
 290         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 291
 292         if ( type ) {
 293                 switch ( type ) {
 294                 case LDAP_TAG_SYNC_NEW_COOKIE:
 295                         ber_printf( ber, "tO", type, cookie );
 296                         break;
 297                 case LDAP_TAG_SYNC_REFRESH_DELETE:
 298                 case LDAP_TAG_SYNC_REFRESH_PRESENT:
 299                         ber_printf( ber, "t{", type );
 300                         if ( cookie ) {
 301                                 ber_printf( ber, "O", cookie );
 302                         }
 303                         if ( refreshDone == 0 ) {
 304                                 ber_printf( ber, "b", refreshDone );
 305                         }
 306                         ber_printf( ber, "N}" );
 307                         break;
 308                 case LDAP_TAG_SYNC_ID_SET:
 309                         ber_printf( ber, "t{", type );
 310                         if ( cookie ) {
 311                                 ber_printf( ber, "O", cookie );
 312                         }
 313                         if ( refreshDeletes == 1 ) {
 314                                 ber_printf( ber, "b", refreshDeletes );
 315                         }
 316                         ber_printf( ber, "[W]", syncUUIDs );
 317                         ber_printf( ber, "N}" );
 318                         break;
 319                 default:
 320                         Debug( LDAP_DEBUG_TRACE,
 321                                 "syncprov_sendinfo: invalid syncinfo type (%d)\n",
 322                                 type, 0, 0 );
 323                         return LDAP_OTHER;
 324                 }
 325         }
 326
 327         ret = ber_flatten2( ber, &rspdata, 0 );
 328
 329         if ( ret < 0 ) {
 330                 Debug( LDAP_DEBUG_TRACE,
 331                         "syncprov_sendinfo: ber_flatten2 failed\n",
 332                         0, 0, 0 );
 333                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 334                 return ret;
 335         }
 336
 337         rs->sr_rspoid = LDAP_SYNC_INFO;
 338         rs->sr_rspdata = &rspdata;
 339         send_ldap_intermediate( op, rs );
 340         rs->sr_rspdata = NULL;
 341         ber_free_buf( ber );
 342
 343         return LDAP_SUCCESS;
 344 }
 345
 346 /* Find a modtarget in an AVL tree */
 347 static int
 348 sp_avl_cmp( const void *c1, const void *c2 )
 349 {
 350         const modtarget *m1, *m2;
 351         int rc;
 352
 353         m1 = c1; m2 = c2;
 354         rc = m1->mt_op->o_req_ndn.bv_len - m2->mt_op->o_req_ndn.bv_len;
 355
 356         if ( rc ) return rc;
 357         return ber_bvcmp( &m1->mt_op->o_req_ndn, &m2->mt_op->o_req_ndn );
 358 }
 359
 360 /* syncprov_findbase:
 361  *   finds the true DN of the base of a search (with alias dereferencing) and
 362  * checks to make sure the base entry doesn't get replaced with a different
 363  * entry (e.g., swapping trees via ModDN, or retargeting an alias). If a
 364  * change is detected, any persistent search on this base must be terminated /
 365  * reloaded.
 366  *   On the first call, we just save the DN and entryID. On subsequent calls
 367  * we compare the DN and entryID with the saved values.
 368  */
 369 static int
 370 findbase_cb( Operation *op, SlapReply *rs )
 371 {
 372         slap_callback *sc = op->o_callback;
 373
 374         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 375                 fbase_cookie *fc = sc->sc_private;
 376
 377                 /* If no entryID, we're looking for the first time.
 378                  * Just store whatever we got.
 379                  */
 380                 if ( fc->fss->s_eid == NOID ) {
 381                         fc->fbase = 2;
 382                         fc->fss->s_eid = rs->sr_entry->e_id;
 383                         ber_dupbv( &fc->fss->s_base, &rs->sr_entry->e_nname );
 384
 385                 } else if ( rs->sr_entry->e_id == fc->fss->s_eid &&
 386                         dn_match( &rs->sr_entry->e_nname, &fc->fss->s_base )) {
 387
 388                 /* OK, the DN is the same and the entryID is the same. */
 389                         fc->fbase = 1;
 390                 }
 391         }
 392         if ( rs->sr_err != LDAP_SUCCESS ) {
 393                 Debug( LDAP_DEBUG_ANY, "findbase failed! %d\n", rs->sr_err,0,0 );
 394         }
 395         return LDAP_SUCCESS;
 396 }
 397
 398 static Filter generic_filter = { LDAP_FILTER_PRESENT, { 0 }, NULL };
 399 static struct berval generic_filterstr = BER_BVC("(objectclass=*)");
 400
 401 static int
 402 syncprov_findbase( Operation *op, fbase_cookie *fc )
 403 {
 404         /* Use basic parameters from syncrepl search, but use
 405          * current op's threadctx / tmpmemctx
 406          */
 407         ldap_pvt_thread_mutex_lock( &fc->fss->s_mutex );
 408         if ( fc->fss->s_flags & PS_FIND_BASE ) {
 409                 slap_callback cb = {0};
 410                 Operation fop;
 411                 SlapReply frs = { REP_RESULT };
 412                 int rc;
 413
 414                 fc->fss->s_flags ^= PS_FIND_BASE;
 415                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 416
 417                 fop = *fc->fss->s_op;
 418
 419                 fop.o_bd = fop.o_bd->bd_self;
 420                 fop.o_hdr = op->o_hdr;
 421                 fop.o_time = op->o_time;
 422                 fop.o_tincr = op->o_tincr;
 423
 424                 cb.sc_response = findbase_cb;
 425                 cb.sc_private = fc;
 426
 427                 fop.o_sync_mode = 0;    /* turn off sync mode */
 428                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 429                 fop.o_callback = &cb;
 430                 fop.o_tag = LDAP_REQ_SEARCH;
 431                 fop.ors_scope = LDAP_SCOPE_BASE;
 432                 fop.ors_limit = NULL;
 433                 fop.ors_slimit = 1;
 434                 fop.ors_tlimit = SLAP_NO_LIMIT;
 435                 fop.ors_attrs = slap_anlist_no_attrs;
 436                 fop.ors_attrsonly = 1;
 437                 fop.ors_filter = &generic_filter;
 438                 fop.ors_filterstr = generic_filterstr;
 439
 440                 rc = fop.o_bd->be_search( &fop, &frs );
 441         } else {
 442                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 443                 fc->fbase = 1;
 444         }
 445
 446         /* After the first call, see if the fdn resides in the scope */
 447         if ( fc->fbase == 1 ) {
 448                 switch ( fc->fss->s_op->ors_scope ) {
 449                 case LDAP_SCOPE_BASE:
 450                         fc->fscope = dn_match( fc->fdn, &fc->fss->s_base );
 451                         break;
 452                 case LDAP_SCOPE_ONELEVEL: {
 453                         struct berval pdn;
 454                         dnParent( fc->fdn, &pdn );
 455                         fc->fscope = dn_match( &pdn, &fc->fss->s_base );
 456                         break; }
 457                 case LDAP_SCOPE_SUBTREE:
 458                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base );
 459                         break;
 460                 case LDAP_SCOPE_SUBORDINATE:
 461                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base ) &&
 462                                 !dn_match( fc->fdn, &fc->fss->s_base );
 463                         break;
 464                 }
 465         }
 466
 467         if ( fc->fbase )
 468                 return LDAP_SUCCESS;
 469
 470         /* If entryID has changed, then the base of this search has
 471          * changed. Invalidate the psearch.
 472          */
 473         return LDAP_NO_SUCH_OBJECT;
 474 }
 475
 476 /* syncprov_findcsn:
 477  *   This function has three different purposes, but they all use a search
 478  * that filters on entryCSN so they're combined here.
 479  * 1: at startup time, after a contextCSN has been read from the database,
 480  * we search for all entries with CSN >= contextCSN in case the contextCSN
 481  * was not checkpointed at the previous shutdown.
 482  *
 483  * 2: when the current contextCSN is known and we have a sync cookie, we search
 484  * for one entry with CSN = the cookie CSN. If not found, try <= cookie CSN.
 485  * If an entry is found, the cookie CSN is valid, otherwise it is stale.
 486  *
 487  * 3: during a refresh phase, we search for all entries with CSN <= the cookie
 488  * CSN, and generate Present records for them. We always collect this result
 489  * in SyncID sets, even if there's only one match.
 490  */
 491 typedef enum find_csn_t {
 492         FIND_MAXCSN     = 1,
 493         FIND_CSN        = 2,
 494         FIND_PRESENT    = 3
 495 } find_csn_t;
 496
 497 static int
 498 findmax_cb( Operation *op, SlapReply *rs )
 499 {
 500         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 501                 struct berval *maxcsn = op->o_callback->sc_private;
 502                 Attribute *a = attr_find( rs->sr_entry->e_attrs,
 503                         slap_schema.si_ad_entryCSN );
 504
 505                 if ( a && ber_bvcmp( &a->a_vals[0], maxcsn ) > 0 &&
 506                         slap_parse_csn_sid( &a->a_vals[0] ) == slap_serverID ) {
 507                         maxcsn->bv_len = a->a_vals[0].bv_len;
 508                         strcpy( maxcsn->bv_val, a->a_vals[0].bv_val );
 509                 }
 510         }
 511         return LDAP_SUCCESS;
 512 }
 513
 514 static int
 515 findcsn_cb( Operation *op, SlapReply *rs )
 516 {
 517         slap_callback *sc = op->o_callback;
 518
 519         /* We just want to know that at least one exists, so it's OK if
 520          * we exceed the unchecked limit.
 521          */
 522         if ( rs->sr_err == LDAP_ADMINLIMIT_EXCEEDED ||
 523                 (rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS )) {
 524                 sc->sc_private = (void *)1;
 525         }
 526         return LDAP_SUCCESS;
 527 }
 528
 529 /* Build a list of entryUUIDs for sending in a SyncID set */
 530
 531 #define UUID_LEN        16
 532
 533 typedef struct fpres_cookie {
 534         int num;
 535         BerVarray uuids;
 536         char *last;
 537 } fpres_cookie;
 538
 539 static int
 540 findpres_cb( Operation *op, SlapReply *rs )
 541 {
 542         slap_callback *sc = op->o_callback;
 543         fpres_cookie *pc = sc->sc_private;
 544         Attribute *a;
 545         int ret = SLAP_CB_CONTINUE;
 546
 547         switch ( rs->sr_type ) {
 548         case REP_SEARCH:
 549                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryUUID );
 550                 if ( a ) {
 551                         pc->uuids[pc->num].bv_val = pc->last;
 552                         AC_MEMCPY( pc->uuids[pc->num].bv_val, a->a_nvals[0].bv_val,
 553                                 pc->uuids[pc->num].bv_len );
 554                         pc->num++;
 555                         pc->last = pc->uuids[pc->num].bv_val;
 556                         pc->uuids[pc->num].bv_val = NULL;
 557                 }
 558                 ret = LDAP_SUCCESS;
 559                 if ( pc->num != SLAP_SYNCUUID_SET_SIZE )
 560                         break;
 561                 /* FALLTHRU */
 562         case REP_RESULT:
 563                 ret = rs->sr_err;
 564                 if ( pc->num ) {
 565                         ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 566                                 0, pc->uuids, 0 );
 567                         pc->uuids[pc->num].bv_val = pc->last;
 568                         pc->num = 0;
 569                         pc->last = pc->uuids[0].bv_val;
 570                 }
 571                 break;
 572         default:
 573                 break;
 574         }
 575         return ret;
 576 }
 577
 578 static int
 579 syncprov_findcsn( Operation *op, find_csn_t mode )
 580 {
 581         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 582         syncprov_info_t         *si = on->on_bi.bi_private;
 583
 584         slap_callback cb = {0};
 585         Operation fop;
 586         SlapReply frs = { REP_RESULT };
 587         char buf[LDAP_PVT_CSNSTR_BUFSIZE + STRLENOF("(entryCSN<=)")];
 588         char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
 589         struct berval maxcsn;
 590         Filter cf;
 591         AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
 592         fpres_cookie pcookie;
 593         sync_control *srs = NULL;
 594         struct slap_limits_set fc_limits;
 595         int i, rc = LDAP_SUCCESS, findcsn_retry = 1;
 596         int maxid;
 597
 598         if ( mode != FIND_MAXCSN ) {
 599                 srs = op->o_controls[slap_cids.sc_LDAPsync];
 600         }
 601
 602         fop = *op;
 603         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync_mode */
 604         /* We want pure entries, not referrals */
 605         fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 606
 607         cf.f_ava = &eq;
 608         cf.f_av_desc = slap_schema.si_ad_entryCSN;
 609         BER_BVZERO( &cf.f_av_value );
 610         cf.f_next = NULL;
 611
 612         fop.o_callback = &cb;
 613         fop.ors_limit = NULL;
 614         fop.ors_tlimit = SLAP_NO_LIMIT;
 615         fop.ors_filter = &cf;
 616         fop.ors_filterstr.bv_val = buf;
 617
 618 again:
 619         switch( mode ) {
 620         case FIND_MAXCSN:
 621                 cf.f_choice = LDAP_FILTER_GE;
 622                 /* If there are multiple CSNs, use the one with our serverID */
 623                 for ( i=0; i<si->si_numcsns; i++) {
 624                         if ( slap_serverID == si->si_sids[i] ) {
 625                                 maxid = i;
 626                                 break;
 627                         }
 628                 }
 629                 if ( i == si->si_numcsns ) {
 630                         /* No match: this is multimaster, and none of the content in the DB
 631                          * originated locally. Treat like no CSN.
 632                          */
 633                         return LDAP_NO_SUCH_OBJECT;
 634                 }
 635                 cf.f_av_value = si->si_ctxcsn[maxid];
 636                 fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 637                         "(entryCSN>=%s)", cf.f_av_value.bv_val );
 638                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 639                         return LDAP_OTHER;
 640                 }
 641                 fop.ors_attrsonly = 0;
 642                 fop.ors_attrs = csn_anlist;
 643                 fop.ors_slimit = SLAP_NO_LIMIT;
 644                 cb.sc_private = &maxcsn;
 645                 cb.sc_response = findmax_cb;
 646                 strcpy( cbuf, cf.f_av_value.bv_val );
 647                 maxcsn.bv_val = cbuf;
 648                 maxcsn.bv_len = cf.f_av_value.bv_len;
 649                 break;
 650         case FIND_CSN:
 651                 if ( BER_BVISEMPTY( &cf.f_av_value )) {
 652                         cf.f_av_value = srs->sr_state.ctxcsn[0];
 653                         /* If there are multiple CSNs, use the smallest */
 654                         for ( i=1; i<srs->sr_state.numcsns; i++ ) {
 655                                 if ( ber_bvcmp( &cf.f_av_value, &srs->sr_state.ctxcsn[i] )
 656                                         > 0 ) {
 657                                         cf.f_av_value = srs->sr_state.ctxcsn[i];
 658                                 }
 659                         }
 660                 }
 661                 /* Look for exact match the first time */
 662                 if ( findcsn_retry ) {
 663                         cf.f_choice = LDAP_FILTER_EQUALITY;
 664                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 665                                 "(entryCSN=%s)", cf.f_av_value.bv_val );
 666                 /* On retry, look for <= */
 667                 } else {
 668                         cf.f_choice = LDAP_FILTER_LE;
 669                         fop.ors_limit = &fc_limits;
 670                         memset( &fc_limits, 0, sizeof( fc_limits ));
 671                         fc_limits.lms_s_unchecked = 1;
 672                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 673                                 "(entryCSN<=%s)", cf.f_av_value.bv_val );
 674                 }
 675                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 676                         return LDAP_OTHER;
 677                 }
 678                 fop.ors_attrsonly = 1;
 679                 fop.ors_attrs = slap_anlist_no_attrs;
 680                 fop.ors_slimit = 1;
 681                 cb.sc_private = NULL;
 682                 cb.sc_response = findcsn_cb;
 683                 break;
 684         case FIND_PRESENT:
 685                 fop.ors_filter = op->ors_filter;
 686                 fop.ors_filterstr = op->ors_filterstr;
 687                 fop.ors_attrsonly = 0;
 688                 fop.ors_attrs = uuid_anlist;
 689                 fop.ors_slimit = SLAP_NO_LIMIT;
 690                 cb.sc_private = &pcookie;
 691                 cb.sc_response = findpres_cb;
 692                 pcookie.num = 0;
 693
 694                 /* preallocate storage for a full set */
 695                 pcookie.uuids = op->o_tmpalloc( (SLAP_SYNCUUID_SET_SIZE+1) *
 696                         sizeof(struct berval) + SLAP_SYNCUUID_SET_SIZE * UUID_LEN,
 697                         op->o_tmpmemctx );
 698                 pcookie.last = (char *)(pcookie.uuids + SLAP_SYNCUUID_SET_SIZE+1);
 699                 pcookie.uuids[0].bv_val = pcookie.last;
 700                 pcookie.uuids[0].bv_len = UUID_LEN;
 701                 for (i=1; i<SLAP_SYNCUUID_SET_SIZE; i++) {
 702                         pcookie.uuids[i].bv_val = pcookie.uuids[i-1].bv_val + UUID_LEN;
 703                         pcookie.uuids[i].bv_len = UUID_LEN;
 704                 }
 705                 break;
 706         }
 707
 708         fop.o_bd->bd_info = (BackendInfo *)on->on_info;
 709         fop.o_bd->be_search( &fop, &frs );
 710         fop.o_bd->bd_info = (BackendInfo *)on;
 711
 712         switch( mode ) {
 713         case FIND_MAXCSN:
 714                 if ( ber_bvcmp( &si->si_ctxcsn[maxid], &maxcsn )) {
 715 #ifdef CHECK_CSN
 716                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
 717                         assert( !syn->ssyn_validate( syn, &maxcsn ));
 718 #endif
 719                         ber_bvreplace( &si->si_ctxcsn[maxid], &maxcsn );
 720                         si->si_numops++;        /* ensure a checkpoint */
 721                 }
 722                 break;
 723         case FIND_CSN:
 724                 /* If matching CSN was not found, invalidate the context. */
 725                 if ( !cb.sc_private ) {
 726                         /* If we didn't find an exact match, then try for <= */
 727                         if ( findcsn_retry ) {
 728                                 findcsn_retry = 0;
 729                                 goto again;
 730                         }
 731                         rc = LDAP_NO_SUCH_OBJECT;
 732                 }
 733                 break;
 734         case FIND_PRESENT:
 735                 op->o_tmpfree( pcookie.uuids, op->o_tmpmemctx );
 736                 break;
 737         }
 738
 739         return rc;
 740 }
 741
 742 static void
 743 syncprov_free_syncop( syncops *so )
 744 {
 745         syncres *sr, *srnext;
 746         GroupAssertion *ga, *gnext;
 747
 748         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 749         if ( --so->s_inuse > 0 ) {
 750                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 751                 return;
 752         }
 753         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 754         if ( so->s_flags & PS_IS_DETACHED ) {
 755                 filter_free( so->s_op->ors_filter );
 756                 for ( ga = so->s_op->o_groups; ga; ga=gnext ) {
 757                         gnext = ga->ga_next;
 758                         ch_free( ga );
 759                 }
 760                 ch_free( so->s_op );
 761         }
 762         ch_free( so->s_base.bv_val );
 763         for ( sr=so->s_res; sr; sr=srnext ) {
 764                 srnext = sr->s_next;
 765                 ch_free( sr );
 766         }
 767         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 768         ch_free( so );
 769 }
 770
 771 /* Send a persistent search response */
 772 static int
 773 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so,
 774         Entry **e, int mode )
 775 {
 776         slap_overinst *on = opc->son;
 777
 778         SlapReply rs = { REP_SEARCH };
 779         LDAPControl *ctrls[2];
 780         struct berval cookie = BER_BVNULL, csns[2];
 781         Entry e_uuid = {0};
 782         Attribute a_uuid = {0};
 783
 784         if ( so->s_op->o_abandon )
 785                 return SLAPD_ABANDON;
 786
 787         ctrls[1] = NULL;
 788         if ( !BER_BVISNULL( &opc->sctxcsn )) {
 789                 csns[0] = opc->sctxcsn;
 790                 BER_BVZERO( &csns[1] );
 791                 slap_compose_sync_cookie( op, &cookie, csns, so->s_rid, slap_serverID ? slap_serverID : -1 );
 792         }
 793
 794 #ifdef LDAP_DEBUG
 795         if ( !BER_BVISNULL( &cookie )) {
 796                 if ( so->s_sid > 0 ) {
 797                         Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: to=%03x, cookie=%s\n",
 798                                 so->s_sid, cookie.bv_val , 0 );
 799                 } else {
 800                         Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: cookie=%s\n",
 801                                 cookie.bv_val, 0, 0 );
 802                 }
 803         }
 804 #endif
 805
 806         e_uuid.e_attrs = &a_uuid;
 807         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 808         a_uuid.a_nvals = &opc->suuid;
 809         rs.sr_err = syncprov_state_ctrl( op, &rs, &e_uuid,
 810                 mode, ctrls, 0, 1, &cookie );
 811         if ( !BER_BVISNULL( &cookie )) {
 812                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
 813         }
 814
 815         rs.sr_ctrls = ctrls;
 816         op->o_bd->bd_info = (BackendInfo *)on->on_info;
 817         switch( mode ) {
 818         case LDAP_SYNC_ADD:
 819                 rs.sr_entry = *e;
 820                 if ( rs.sr_entry->e_private )
 821                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 822                 if ( opc->sreference && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 823                         rs.sr_ref = get_entry_referrals( op, rs.sr_entry );
 824                         rs.sr_err = send_search_reference( op, &rs );
 825                         ber_bvarray_free( rs.sr_ref );
 826                         if ( !rs.sr_entry )
 827                                 *e = NULL;
 828                         break;
 829                 }
 830                 /* fallthru */
 831         case LDAP_SYNC_MODIFY:
 832                 rs.sr_entry = *e;
 833                 if ( rs.sr_entry->e_private )
 834                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 835                 rs.sr_attrs = op->ors_attrs;
 836                 rs.sr_err = send_search_entry( op, &rs );
 837                 if ( !rs.sr_entry )
 838                         *e = NULL;
 839                 break;
 840         case LDAP_SYNC_DELETE:
 841                 e_uuid.e_attrs = NULL;
 842                 e_uuid.e_name = opc->sdn;
 843                 e_uuid.e_nname = opc->sndn;
 844                 rs.sr_entry = &e_uuid;
 845                 if ( opc->sreference && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 846                         struct berval bv = BER_BVNULL;
 847                         rs.sr_ref = &bv;
 848                         rs.sr_err = send_search_reference( op, &rs );
 849                 } else {
 850                         rs.sr_err = send_search_entry( op, &rs );
 851                 }
 852                 break;
 853         default:
 854                 assert(0);
 855         }
 856         /* In case someone else freed it already? */
 857         if ( rs.sr_ctrls ) {
 858                 op->o_tmpfree( rs.sr_ctrls[0], op->o_tmpmemctx );
 859                 rs.sr_ctrls = NULL;
 860         }
 861
 862         return rs.sr_err;
 863 }
 864
 865 static void
 866 syncprov_qstart( syncops *so );
 867
 868 /* Play back queued responses */
 869 static int
 870 syncprov_qplay( Operation *op, syncops *so )
 871 {
 872         slap_overinst *on = LDAP_SLIST_FIRST(&so->s_op->o_extra)->oe_key;
 873         syncres *sr;
 874         Entry *e;
 875         opcookie opc;
 876         int rc = 0;
 877
 878         opc.son = on;
 879
 880         do {
 881                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 882                 sr = so->s_res;
 883                 if ( sr )
 884                         so->s_res = sr->s_next;
 885                 if ( !so->s_res )
 886                         so->s_restail = NULL;
 887                 /* Exit loop with mutex held */
 888                 if ( !sr || so->s_op->o_abandon )
 889                         break;
 890                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 891
 892                 if ( sr->s_mode == LDAP_SYNC_NEW_COOKIE ) {
 893                     SlapReply rs = { REP_INTERMEDIATE };
 894
 895                     rc = syncprov_sendinfo( op, &rs, LDAP_TAG_SYNC_NEW_COOKIE,
 896                                 &sr->s_csn, 0, NULL, 0 );
 897                 } else {
 898                         opc.sdn = sr->s_dn;
 899                         opc.sndn = sr->s_ndn;
 900                         opc.suuid = sr->s_uuid;
 901                         opc.sctxcsn = sr->s_csn;
 902                         opc.sreference = sr->s_isreference;
 903                         e = NULL;
 904
 905                         if ( sr->s_mode != LDAP_SYNC_DELETE ) {
 906                                 rc = overlay_entry_get_ov( op, &opc.sndn, NULL, NULL, 0, &e, on );
 907                                 if ( rc ) {
 908                                         Debug( LDAP_DEBUG_SYNC, "syncprov_qplay: failed to get %s, "
 909                                                 "error (%d), ignoring...\n", opc.sndn.bv_val, rc, 0 );
 910                                         ch_free( sr );
 911                                         rc = 0;
 912                                         continue;
 913                                 }
 914                         }
 915                         rc = syncprov_sendresp( op, &opc, so, &e, sr->s_mode );
 916
 917                         if ( e ) {
 918                                 overlay_entry_release_ov( op, e, 0, on );
 919                         }
 920                 }
 921
 922                 ch_free( sr );
 923
 924                 /* Exit loop with mutex held */
 925                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 926
 927         } while (0);
 928
 929         /* We now only send one change at a time, to prevent one
 930          * psearch from hogging all the CPU. Resubmit this task if
 931          * there are more responses queued and no errors occurred.
 932          */
 933
 934         if ( rc == 0 && so->s_res ) {
 935                 syncprov_qstart( so );
 936         } else {
 937                 so->s_flags ^= PS_TASK_QUEUED;
 938         }
 939
 940         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 941         return rc;
 942 }
 943
 944 /* task for playing back queued responses */
 945 static void *
 946 syncprov_qtask( void *ctx, void *arg )
 947 {
 948         syncops *so = arg;
 949         OperationBuffer opbuf;
 950         Operation *op;
 951         BackendDB be;
 952         int rc;
 953
 954         op = &opbuf.ob_op;
 955         *op = *so->s_op;
 956         op->o_hdr = &opbuf.ob_hdr;
 957         op->o_controls = opbuf.ob_controls;
 958         memset( op->o_controls, 0, sizeof(opbuf.ob_controls) );
 959
 960         *op->o_hdr = *so->s_op->o_hdr;
 961
 962         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx, 1);
 963         op->o_tmpmfuncs = &slap_sl_mfuncs;
 964         op->o_threadctx = ctx;
 965
 966         /* syncprov_qplay expects a fake db */
 967         be = *so->s_op->o_bd;
 968         be.be_flags |= SLAP_DBFLAG_OVERLAY;
 969         op->o_bd = &be;
 970         LDAP_SLIST_FIRST(&op->o_extra) = NULL;
 971         op->o_callback = NULL;
 972
 973         rc = syncprov_qplay( op, so );
 974
 975         /* decrement use count... */
 976         syncprov_free_syncop( so );
 977
 978         return NULL;
 979 }
 980
 981 /* Start the task to play back queued psearch responses */
 982 static void
 983 syncprov_qstart( syncops *so )
 984 {
 985         so->s_flags |= PS_TASK_QUEUED;
 986         so->s_inuse++;
 987         ldap_pvt_thread_pool_submit( &connection_pool,
 988                 syncprov_qtask, so );
 989 }
 990
 991 /* Queue a persistent search response */
 992 static int
 993 syncprov_qresp( opcookie *opc, syncops *so, int mode )
 994 {
 995         syncres *sr;
 996         int srsize;
 997         struct berval cookie = opc->sctxcsn;
 998
 999         if ( mode == LDAP_SYNC_NEW_COOKIE ) {
1000                 syncprov_info_t *si = opc->son->on_bi.bi_private;
1001
1002                 slap_compose_sync_cookie( NULL, &cookie, si->si_ctxcsn,
1003                         so->s_rid, slap_serverID ? slap_serverID : -1);
1004         }
1005
1006         srsize = sizeof(syncres) + opc->suuid.bv_len + 1 +
1007                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1;
1008         if ( cookie.bv_len )
1009                 srsize += cookie.bv_len + 1;
1010         sr = ch_malloc( srsize );
1011         sr->s_next = NULL;
1012         sr->s_dn.bv_val = (char *)(sr + 1);
1013         sr->s_dn.bv_len = opc->sdn.bv_len;
1014         sr->s_mode = mode;
1015         sr->s_isreference = opc->sreference;
1016         sr->s_ndn.bv_val = lutil_strcopy( sr->s_dn.bv_val,
1017                  opc->sdn.bv_val ) + 1;
1018         sr->s_ndn.bv_len = opc->sndn.bv_len;
1019         sr->s_uuid.bv_val = lutil_strcopy( sr->s_ndn.bv_val,
1020                  opc->sndn.bv_val ) + 1;
1021         sr->s_uuid.bv_len = opc->suuid.bv_len;
1022         AC_MEMCPY( sr->s_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1023         if ( cookie.bv_len ) {
1024                 sr->s_csn.bv_val = sr->s_uuid.bv_val + sr->s_uuid.bv_len + 1;
1025                 strcpy( sr->s_csn.bv_val, cookie.bv_val );
1026         } else {
1027                 sr->s_csn.bv_val = NULL;
1028         }
1029         sr->s_csn.bv_len = cookie.bv_len;
1030
1031         if ( mode == LDAP_SYNC_NEW_COOKIE && cookie.bv_val ) {
1032                 ch_free( cookie.bv_val );
1033         }
1034
1035         ldap_pvt_thread_mutex_lock( &so->s_mutex );
1036         if ( !so->s_res ) {
1037                 so->s_res = sr;
1038         } else {
1039                 so->s_restail->s_next = sr;
1040         }
1041         so->s_restail = sr;
1042
1043         /* If the base of the psearch was modified, check it next time round */
1044         if ( so->s_flags & PS_WROTE_BASE ) {
1045                 so->s_flags ^= PS_WROTE_BASE;
1046                 so->s_flags |= PS_FIND_BASE;
1047         }
1048         if (( so->s_flags & (PS_IS_DETACHED|PS_TASK_QUEUED)) == PS_IS_DETACHED ) {
1049                 syncprov_qstart( so );
1050         }
1051         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
1052         return LDAP_SUCCESS;
1053 }
1054
1055 static int
1056 syncprov_drop_psearch( syncops *so, int lock )
1057 {
1058         if ( so->s_flags & PS_IS_DETACHED ) {
1059                 if ( lock )
1060                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
1061                 so->s_op->o_conn->c_n_ops_executing--;
1062                 so->s_op->o_conn->c_n_ops_completed++;
1063                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, Operation,
1064                         o_next );
1065                 if ( lock )
1066                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
1067         }
1068         syncprov_free_syncop( so );
1069
1070         return 0;
1071 }
1072
1073 static int
1074 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
1075 {
1076         slap_callback *sc = op->o_callback;
1077         op->o_callback = sc->sc_next;
1078         syncprov_drop_psearch( op->o_callback->sc_private, 0 );
1079         op->o_tmpfree( sc, op->o_tmpmemctx );
1080         return 0;
1081 }
1082
1083 static int
1084 syncprov_op_abandon( Operation *op, SlapReply *rs )
1085 {
1086         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1087         syncprov_info_t         *si = on->on_bi.bi_private;
1088         syncops *so, *soprev;
1089
1090         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1091         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
1092                 soprev=so, so=so->s_next ) {
1093                 if ( so->s_op->o_connid == op->o_connid &&
1094                         so->s_op->o_msgid == op->orn_msgid ) {
1095                                 so->s_op->o_abandon = 1;
1096                                 soprev->s_next = so->s_next;
1097                                 break;
1098                 }
1099         }
1100         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1101         if ( so ) {
1102                 /* Is this really a Cancel exop? */
1103                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
1104                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
1105                         rs->sr_err = LDAP_CANCELLED;
1106                         send_ldap_result( so->s_op, rs );
1107                         if ( so->s_flags & PS_IS_DETACHED ) {
1108                                 slap_callback *cb;
1109                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
1110                                 cb->sc_cleanup = syncprov_ab_cleanup;
1111                                 cb->sc_next = op->o_callback;
1112                                 cb->sc_private = so;
1113                                 return SLAP_CB_CONTINUE;
1114                         }
1115                 }
1116                 syncprov_drop_psearch( so, 0 );
1117         }
1118         return SLAP_CB_CONTINUE;
1119 }
1120
1121 /* Find which persistent searches are affected by this operation */
1122 static void
1123 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
1124 {
1125         slap_overinst *on = opc->son;
1126         syncprov_info_t         *si = on->on_bi.bi_private;
1127
1128         fbase_cookie fc;
1129         syncops *ss, *sprev, *snext;
1130         Entry *e = NULL;
1131         Attribute *a;
1132         int rc;
1133         struct berval newdn;
1134         int freefdn = 0;
1135         BackendDB *b0 = op->o_bd, db;
1136
1137         fc.fdn = &op->o_req_ndn;
1138         /* compute new DN */
1139         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1140                 struct berval pdn;
1141                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
1142                 else dnParent( fc.fdn, &pdn );
1143                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
1144                 fc.fdn = &newdn;
1145                 freefdn = 1;
1146         }
1147         if ( op->o_tag != LDAP_REQ_ADD ) {
1148                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1149                         db = *op->o_bd;
1150                         op->o_bd = &db;
1151                 }
1152                 rc = overlay_entry_get_ov( op, fc.fdn, NULL, NULL, 0, &e, on );
1153                 /* If we're sending responses now, make a copy and unlock the DB */
1154                 if ( e && !saveit ) {
1155                         Entry *e2 = entry_dup( e );
1156                         overlay_entry_release_ov( op, e, 0, on );
1157                         e = e2;
1158                 }
1159                 if ( rc ) {
1160                         op->o_bd = b0;
1161                         return;
1162                 }
1163         } else {
1164                 e = op->ora_e;
1165         }
1166
1167         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1168                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1169                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1170                 opc->sreference = is_entry_referral( e );
1171                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1172                 if ( a )
1173                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1174         } else if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1175                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1176                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1177                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1178                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1179         }
1180
1181         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1182         for (ss = si->si_ops, sprev = (syncops *)&si->si_ops; ss;
1183                 sprev = ss, ss=snext)
1184         {
1185                 Operation op2;
1186                 Opheader oh;
1187                 syncmatches *sm;
1188                 int found = 0;
1189
1190                 snext = ss->s_next;
1191                 if ( ss->s_op->o_abandon )
1192                         continue;
1193
1194                 /* First time thru, check for possible skips */
1195                 if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1196
1197                         /* Don't send ops back to the originator */
1198                         if ( opc->osid > 0 && opc->osid == ss->s_sid ) {
1199                                 Debug( LDAP_DEBUG_SYNC, "syncprov_matchops: skipping original sid %03x\n",
1200                                         opc->osid, 0, 0 );
1201                                 continue;
1202                         }
1203
1204                         /* Don't send ops back to the messenger */
1205                         if ( opc->rsid > 0 && opc->rsid == ss->s_sid ) {
1206                                 Debug( LDAP_DEBUG_SYNC, "syncprov_matchops: skipping relayed sid %03x\n",
1207                                         opc->rsid, 0, 0 );
1208                                 continue;
1209                         }
1210                 }
1211
1212                 /* validate base */
1213                 fc.fss = ss;
1214                 fc.fbase = 0;
1215                 fc.fscope = 0;
1216
1217                 /* If the base of the search is missing, signal a refresh */
1218                 rc = syncprov_findbase( op, &fc );
1219                 if ( rc != LDAP_SUCCESS ) {
1220                         SlapReply rs = {REP_RESULT};
1221                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1222                                 "search base has changed" );
1223                         sprev->s_next = snext;
1224                         syncprov_drop_psearch( ss, 1 );
1225                         ss = sprev;
1226                         continue;
1227                 }
1228
1229
1230                 /* If we're sending results now, look for this op in old matches */
1231                 if ( !saveit ) {
1232                         syncmatches *old;
1233
1234                         /* Did we modify the search base? */
1235                         if ( dn_match( &op->o_req_ndn, &ss->s_base )) {
1236                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1237                                 ss->s_flags |= PS_WROTE_BASE;
1238                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1239                         }
1240
1241                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1242                                 old=sm, sm=sm->sm_next ) {
1243                                 if ( sm->sm_op == ss ) {
1244                                         found = 1;
1245                                         old->sm_next = sm->sm_next;
1246                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1247                                         break;
1248                                 }
1249                         }
1250                 }
1251
1252                 if ( fc.fscope ) {
1253                         op2 = *ss->s_op;
1254                         oh = *op->o_hdr;
1255                         oh.oh_conn = ss->s_op->o_conn;
1256                         oh.oh_connid = ss->s_op->o_connid;
1257                         op2.o_bd = op->o_bd->bd_self;
1258                         op2.o_hdr = &oh;
1259                         op2.o_extra = op->o_extra;
1260                         op2.o_callback = NULL;
1261                         rc = test_filter( &op2, e, ss->s_op->ors_filter );
1262                 }
1263
1264                 Debug( LDAP_DEBUG_TRACE, "syncprov_matchops: sid %03x fscope %d rc %d\n",
1265                         ss->s_sid, fc.fscope, rc );
1266
1267                 /* check if current o_req_dn is in scope and matches filter */
1268                 if ( fc.fscope && rc == LDAP_COMPARE_TRUE ) {
1269                         if ( saveit ) {
1270                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1271                                 sm->sm_next = opc->smatches;
1272                                 sm->sm_op = ss;
1273                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1274                                 ++ss->s_inuse;
1275                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1276                                 opc->smatches = sm;
1277                         } else {
1278                                 /* if found send UPDATE else send ADD */
1279                                 syncprov_qresp( opc, ss,
1280                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD );
1281                         }
1282                 } else if ( !saveit && found ) {
1283                         /* send DELETE */
1284                         syncprov_qresp( opc, ss, LDAP_SYNC_DELETE );
1285                 } else if ( !saveit ) {
1286                         syncprov_qresp( opc, ss, LDAP_SYNC_NEW_COOKIE );
1287                 }
1288                 if ( !saveit && found ) {
1289                         /* Decrement s_inuse, was incremented when called
1290                          * with saveit == TRUE
1291                          */
1292                         syncprov_free_syncop( ss );
1293                 }
1294         }
1295         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1296
1297         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1298                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1299                         op->o_bd = &db;
1300                 }
1301                 overlay_entry_release_ov( op, e, 0, on );
1302                 op->o_bd = b0;
1303         }
1304         if ( freefdn ) {
1305                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1306         }
1307         op->o_bd = b0;
1308 }
1309
1310 static int
1311 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1312 {
1313         slap_callback *cb = op->o_callback;
1314         opcookie *opc = cb->sc_private;
1315         slap_overinst *on = opc->son;
1316         syncprov_info_t         *si = on->on_bi.bi_private;
1317         syncmatches *sm, *snext;
1318         modtarget *mt, mtdummy;
1319
1320         for (sm = opc->smatches; sm; sm=snext) {
1321                 snext = sm->sm_next;
1322                 syncprov_free_syncop( sm->sm_op );
1323                 op->o_tmpfree( sm, op->o_tmpmemctx );
1324         }
1325
1326         /* Remove op from lock table */
1327         mt = opc->smt;
1328         if ( mt ) {
1329                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1330                 mt->mt_mods = mt->mt_mods->mi_next;
1331                 /* If there are more, promote the next one */
1332                 if ( mt->mt_mods ) {
1333                         mt->mt_op = mt->mt_mods->mi_op;
1334                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1335                 } else {
1336                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1337                         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1338                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1339                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1340                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1341                         ch_free( mt );
1342                 }
1343         }
1344         if ( !BER_BVISNULL( &opc->suuid ))
1345                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1346         if ( !BER_BVISNULL( &opc->sndn ))
1347                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1348         if ( !BER_BVISNULL( &opc->sdn ))
1349                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1350         op->o_callback = cb->sc_next;
1351         op->o_tmpfree(cb, op->o_tmpmemctx);
1352
1353         return 0;
1354 }
1355
1356 static void
1357 syncprov_checkpoint( Operation *op, SlapReply *rs, slap_overinst *on )
1358 {
1359         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
1360         Modifications mod;
1361         Operation opm;
1362         SlapReply rsm = { 0 };
1363         slap_callback cb = {0};
1364         BackendDB be;
1365         struct berval ctxdn;
1366
1367 #ifdef CHECK_CSN
1368         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1369
1370         int i;
1371         for ( i=0; i<si->si_numcsns; i++ ) {
1372                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1373         }
1374 #endif
1375         mod.sml_numvals = si->si_numcsns;
1376         mod.sml_values = si->si_ctxcsn;
1377         mod.sml_nvalues = NULL;
1378         mod.sml_desc = slap_schema.si_ad_contextCSN;
1379         mod.sml_op = LDAP_MOD_REPLACE;
1380         mod.sml_flags = SLAP_MOD_INTERNAL;
1381         mod.sml_next = NULL;
1382
1383         cb.sc_response = slap_null_cb;
1384         opm = *op;
1385         opm.o_tag = LDAP_REQ_MODIFY;
1386         opm.o_callback = &cb;
1387         opm.orm_modlist = &mod;
1388         opm.orm_no_opattrs = 1;
1389         if ( SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1390                 be = *on->on_info->oi_origdb;
1391                 opm.o_bd = &be;
1392                 ctxdn = be.be_nsuffix[0];
1393         } else {
1394                 ctxdn = si->si_contextdn;
1395         }
1396         opm.o_req_dn = ctxdn;
1397         opm.o_req_ndn = ctxdn;
1398         opm.o_bd->bd_info = on->on_info->oi_orig;
1399         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1400         opm.o_no_schema_check = 1;
1401         opm.o_bd->be_modify( &opm, &rsm );
1402         if ( mod.sml_next != NULL ) {
1403                 slap_mods_free( mod.sml_next, 1 );
1404         }
1405 #ifdef CHECK_CSN
1406         for ( i=0; i<si->si_numcsns; i++ ) {
1407                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1408         }
1409 #endif
1410 }
1411
1412 static void
1413 syncprov_add_slog( Operation *op )
1414 {
1415         opcookie *opc = op->o_callback->sc_private;
1416         slap_overinst *on = opc->son;
1417         syncprov_info_t         *si = on->on_bi.bi_private;
1418         sessionlog *sl;
1419         slog_entry *se;
1420
1421         sl = si->si_logs;
1422         {
1423                 /* Allocate a record. UUIDs are not NUL-terminated. */
1424                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1425                         op->o_csn.bv_len + 1 );
1426                 se->se_next = NULL;
1427                 se->se_tag = op->o_tag;
1428
1429                 se->se_uuid.bv_val = (char *)(&se[1]);
1430                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1431                 se->se_uuid.bv_len = opc->suuid.bv_len;
1432
1433                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1434                 AC_MEMCPY( se->se_csn.bv_val, op->o_csn.bv_val, op->o_csn.bv_len );
1435                 se->se_csn.bv_val[op->o_csn.bv_len] = '\0';
1436                 se->se_csn.bv_len = op->o_csn.bv_len;
1437                 se->se_sid = slap_parse_csn_sid( &se->se_csn );
1438
1439                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1440                 if ( sl->sl_head ) {
1441                         sl->sl_tail->se_next = se;
1442                 } else {
1443                         sl->sl_head = se;
1444                 }
1445                 sl->sl_tail = se;
1446                 sl->sl_num++;
1447                 while ( sl->sl_num > sl->sl_size ) {
1448                         se = sl->sl_head;
1449                         sl->sl_head = se->se_next;
1450                         strcpy( sl->sl_mincsn.bv_val, se->se_csn.bv_val );
1451                         sl->sl_mincsn.bv_len = se->se_csn.bv_len;
1452                         ch_free( se );
1453                         sl->sl_num--;
1454                 }
1455                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1456         }
1457 }
1458
1459 /* Just set a flag if we found the matching entry */
1460 static int
1461 playlog_cb( Operation *op, SlapReply *rs )
1462 {
1463         if ( rs->sr_type == REP_SEARCH ) {
1464                 op->o_callback->sc_private = (void *)1;
1465         }
1466         return rs->sr_err;
1467 }
1468
1469 /* enter with sl->sl_mutex locked, release before returning */
1470 static void
1471 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1472         sync_control *srs, BerVarray ctxcsn, int numcsns, int *sids )
1473 {
1474         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1475         slog_entry *se;
1476         int i, j, ndel, num, nmods, mmods;
1477         char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
1478         BerVarray uuids;
1479         struct berval delcsn[2];
1480
1481         if ( !sl->sl_num ) {
1482                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1483                 return;
1484         }
1485
1486         num = sl->sl_num;
1487         i = 0;
1488         nmods = 0;
1489
1490         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1491                 num * UUID_LEN, op->o_tmpmemctx );
1492         uuids[0].bv_val = (char *)(uuids + num + 1);
1493
1494         delcsn[0].bv_len = 0;
1495         delcsn[0].bv_val = cbuf;
1496         BER_BVZERO(&delcsn[1]);
1497
1498         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1499          * and everything else at the end. Do this first so we can
1500          * unlock the list mutex.
1501          */
1502         Debug( LDAP_DEBUG_SYNC, "srs csn %s\n",
1503                 srs->sr_state.ctxcsn[0].bv_val, 0, 0 );
1504         for ( se=sl->sl_head; se; se=se->se_next ) {
1505                 int k;
1506                 Debug( LDAP_DEBUG_SYNC, "log csn %s\n", se->se_csn.bv_val, 0, 0 );
1507                 ndel = 1;
1508                 for ( k=0; k<srs->sr_state.numcsns; k++ ) {
1509                         if ( se->se_sid == srs->sr_state.sids[k] ) {
1510                                 ndel = ber_bvcmp( &se->se_csn, &srs->sr_state.ctxcsn[k] );
1511                                 break;
1512                         }
1513                 }
1514                 if ( ndel <= 0 ) {
1515                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too old\n", ndel, 0, 0 );
1516                         continue;
1517                 }
1518                 ndel = 0;
1519                 for ( k=0; k<numcsns; k++ ) {
1520                         if ( se->se_sid == sids[k] ) {
1521                                 ndel = ber_bvcmp( &se->se_csn, &ctxcsn[k] );
1522                                 break;
1523                         }
1524                 }
1525                 if ( ndel > 0 ) {
1526                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too new\n", ndel, 0, 0 );
1527                         break;
1528                 }
1529                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1530                         j = i;
1531                         i++;
1532                         AC_MEMCPY( cbuf, se->se_csn.bv_val, se->se_csn.bv_len );
1533                         delcsn[0].bv_len = se->se_csn.bv_len;
1534                         delcsn[0].bv_val[delcsn[0].bv_len] = '\0';
1535                 } else {
1536                         nmods++;
1537                         j = num - nmods;
1538                 }
1539                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1540                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1541                 uuids[j].bv_len = UUID_LEN;
1542         }
1543         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1544
1545         ndel = i;
1546
1547         /* Zero out unused slots */
1548         for ( i=ndel; i < num - nmods; i++ )
1549                 uuids[i].bv_len = 0;
1550
1551         /* Mods must be validated to see if they belong in this delete set.
1552          */
1553
1554         mmods = nmods;
1555         /* Strip any duplicates */
1556         for ( i=0; i<nmods; i++ ) {
1557                 for ( j=0; j<ndel; j++ ) {
1558                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1559                                 uuids[num - 1 - i].bv_len = 0;
1560                                 mmods --;
1561                                 break;
1562                         }
1563                 }
1564                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1565                 for ( j=0; j<i; j++ ) {
1566                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1567                                 uuids[num - 1 - i].bv_len = 0;
1568                                 mmods --;
1569                                 break;
1570                         }
1571                 }
1572         }
1573
1574         if ( mmods ) {
1575                 Operation fop;
1576                 SlapReply frs = { REP_RESULT };
1577                 int rc;
1578                 Filter mf, af;
1579                 AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
1580                 slap_callback cb = {0};
1581
1582                 fop = *op;
1583
1584                 fop.o_sync_mode = 0;
1585                 fop.o_callback = &cb;
1586                 fop.ors_limit = NULL;
1587                 fop.ors_tlimit = SLAP_NO_LIMIT;
1588                 fop.ors_attrs = slap_anlist_all_attributes;
1589                 fop.ors_attrsonly = 0;
1590                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1591
1592                 af.f_choice = LDAP_FILTER_AND;
1593                 af.f_next = NULL;
1594                 af.f_and = &mf;
1595                 mf.f_choice = LDAP_FILTER_EQUALITY;
1596                 mf.f_ava = &eq;
1597                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1598                 mf.f_next = fop.ors_filter;
1599
1600                 fop.ors_filter = &af;
1601
1602                 cb.sc_response = playlog_cb;
1603                 fop.o_bd->bd_info = (BackendInfo *)on->on_info;
1604
1605                 for ( i=ndel; i<num; i++ ) {
1606                         if ( uuids[i].bv_len == 0 ) continue;
1607
1608                         mf.f_av_value = uuids[i];
1609                         cb.sc_private = NULL;
1610                         fop.ors_slimit = 1;
1611                         frs.sr_nentries = 0;
1612                         rc = fop.o_bd->be_search( &fop, &frs );
1613
1614                         /* If entry was not found, add to delete list */
1615                         if ( !cb.sc_private ) {
1616                                 uuids[ndel++] = uuids[i];
1617                         }
1618                 }
1619                 fop.o_bd->bd_info = (BackendInfo *)on;
1620         }
1621         if ( ndel ) {
1622                 struct berval cookie;
1623
1624                 if ( delcsn[0].bv_len ) {
1625                         slap_compose_sync_cookie( op, &cookie, delcsn, srs->sr_state.rid,
1626                                 slap_serverID ? slap_serverID : -1 );
1627
1628                         Debug( LDAP_DEBUG_SYNC, "syncprov_playlog: cookie=%s\n", cookie.bv_val, 0, 0 );
1629                 }
1630
1631                 uuids[ndel].bv_val = NULL;
1632                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET,
1633                         delcsn[0].bv_len ? &cookie : NULL, 0, uuids, 1 );
1634                 if ( delcsn[0].bv_len ) {
1635                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1636                 }
1637         }
1638         op->o_tmpfree( uuids, op->o_tmpmemctx );
1639 }
1640
1641 static int
1642 syncprov_op_response( Operation *op, SlapReply *rs )
1643 {
1644         opcookie *opc = op->o_callback->sc_private;
1645         slap_overinst *on = opc->son;
1646         syncprov_info_t         *si = on->on_bi.bi_private;
1647         syncmatches *sm;
1648
1649         if ( rs->sr_err == LDAP_SUCCESS )
1650         {
1651                 struct berval maxcsn;
1652                 char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
1653                 int do_check = 0, have_psearches, foundit, csn_changed = 0;
1654
1655                 ldap_pvt_thread_mutex_lock( &si->si_resp_mutex );
1656
1657                 /* Update our context CSN */
1658                 cbuf[0] = '\0';
1659                 maxcsn.bv_val = cbuf;
1660                 maxcsn.bv_len = sizeof(cbuf);
1661                 ldap_pvt_thread_rdwr_wlock( &si->si_csn_rwlock );
1662
1663                 if ( op->o_dont_replicate && op->o_tag == LDAP_REQ_MODIFY &&
1664                                 op->orm_modlist->sml_op == LDAP_MOD_REPLACE &&
1665                                 op->orm_modlist->sml_desc == slap_schema.si_ad_contextCSN ) {
1666                         /* Catch contextCSN updates from syncrepl. We have to look at
1667                          * all the attribute values, as there may be more than one csn
1668                          * that changed, and only one can be passed in the csn queue.
1669                          */
1670                         Modifications *mod = op->orm_modlist;
1671                         int i, j, sid;
1672
1673                         for ( i=0; i<mod->sml_numvals; i++ ) {
1674                                 sid = slap_parse_csn_sid( &mod->sml_values[i] );
1675
1676                                 for ( j=0; j<si->si_numcsns; j++ ) {
1677                                         if ( sid == si->si_sids[j] ) {
1678                                                 if ( ber_bvcmp( &mod->sml_values[i], &si->si_ctxcsn[j] ) > 0 ) {
1679                                                         ber_bvreplace( &si->si_ctxcsn[j], &mod->sml_values[i] );
1680                                                         csn_changed = 1;
1681                                                 }
1682                                                 break;
1683                                         }
1684                                 }
1685
1686                                 if ( j == si->si_numcsns ) {
1687                                         value_add_one( &si->si_ctxcsn, &mod->sml_values[i] );
1688                                         si->si_numcsns++;
1689                                         si->si_sids = ch_realloc( si->si_sids, si->si_numcsns *
1690                                                 sizeof(int));
1691                                         si->si_sids[j] = sid;
1692                                         csn_changed = 1;
1693                                 }
1694                         }
1695                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1696
1697                         if ( csn_changed ) {
1698                                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1699                                 have_psearches = ( si->si_ops != NULL );
1700                                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1701
1702                                 if ( have_psearches ) {
1703                                         for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1704                                                 if ( sm->sm_op->s_op->o_abandon )
1705                                                         continue;
1706                                                 syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_NEW_COOKIE );
1707                                         }
1708                                 }
1709                         }
1710                         goto leave;
1711                 }
1712
1713                 slap_get_commit_csn( op, &maxcsn, &foundit );
1714                 if ( BER_BVISEMPTY( &maxcsn ) && SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1715                         /* syncrepl queues the CSN values in the db where
1716                          * it is configured , not where the changes are made.
1717                          * So look for a value in the glue db if we didn't
1718                          * find any in this db.
1719                          */
1720                         BackendDB *be = op->o_bd;
1721                         op->o_bd = select_backend( &be->be_nsuffix[0], 1);
1722                         maxcsn.bv_val = cbuf;
1723                         maxcsn.bv_len = sizeof(cbuf);
1724                         slap_get_commit_csn( op, &maxcsn, &foundit );
1725                         op->o_bd = be;
1726                 }
1727                 if ( !BER_BVISEMPTY( &maxcsn ) ) {
1728                         int i, sid;
1729 #ifdef CHECK_CSN
1730                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1731                         assert( !syn->ssyn_validate( syn, &maxcsn ));
1732 #endif
1733                         sid = slap_parse_csn_sid( &maxcsn );
1734                         for ( i=0; i<si->si_numcsns; i++ ) {
1735                                 if ( sid == si->si_sids[i] ) {
1736                                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn[i] ) > 0 ) {
1737                                                 ber_bvreplace( &si->si_ctxcsn[i], &maxcsn );
1738                                                 csn_changed = 1;
1739                                         }
1740                                         break;
1741                                 }
1742                         }
1743                         /* It's a new SID for us */
1744                         if ( i == si->si_numcsns ) {
1745                                 value_add_one( &si->si_ctxcsn, &maxcsn );
1746                                 csn_changed = 1;
1747                                 si->si_numcsns++;
1748                                 si->si_sids = ch_realloc( si->si_sids, si->si_numcsns *
1749                                         sizeof(int));
1750                                 si->si_sids[i] = sid;
1751                         }
1752 #if 0
1753                 } else if ( !foundit ) {
1754                         /* internal ops that aren't meant to be replicated */
1755                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1756                         return SLAP_CB_CONTINUE;
1757 #endif
1758                 }
1759
1760                 /* Don't do any processing for consumer contextCSN updates */
1761                 if ( op->o_dont_replicate ) {
1762                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1763                         goto leave;
1764                 }
1765
1766                 si->si_numops++;
1767                 if ( si->si_chkops || si->si_chktime ) {
1768                         /* Never checkpoint adding the context entry,
1769                          * it will deadlock
1770                          */
1771                         if ( op->o_tag != LDAP_REQ_ADD ||
1772                                 !dn_match( &op->o_req_ndn, &si->si_contextdn )) {
1773                                 if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1774                                         do_check = 1;
1775                                         si->si_numops = 0;
1776                                 }
1777                                 if ( si->si_chktime &&
1778                                         (op->o_time - si->si_chklast >= si->si_chktime )) {
1779                                         if ( si->si_chklast ) {
1780                                                 do_check = 1;
1781                                                 si->si_chklast = op->o_time;
1782                                         } else {
1783                                                 si->si_chklast = 1;
1784                                         }
1785                                 }
1786                         }
1787                 }
1788                 ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1789
1790                 if ( do_check ) {
1791                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1792                         syncprov_checkpoint( op, rs, on );
1793                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1794                 }
1795
1796                 /* only update consumer ctx if this is a newer csn */
1797                 if ( csn_changed ) {
1798                         opc->sctxcsn = maxcsn;
1799                 }
1800
1801                 /* Handle any persistent searches */
1802                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1803                 have_psearches = ( si->si_ops != NULL );
1804                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1805                 if ( have_psearches ) {
1806                         switch(op->o_tag) {
1807                         case LDAP_REQ_ADD:
1808                         case LDAP_REQ_MODIFY:
1809                         case LDAP_REQ_MODRDN:
1810                         case LDAP_REQ_EXTENDED:
1811                                 syncprov_matchops( op, opc, 0 );
1812                                 break;
1813                         case LDAP_REQ_DELETE:
1814                                 /* for each match in opc->smatches:
1815                                  *   send DELETE msg
1816                                  */
1817                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1818                                         if ( sm->sm_op->s_op->o_abandon )
1819                                                 continue;
1820                                         syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_DELETE );
1821                                 }
1822                                 break;
1823                         }
1824                 }
1825
1826                 /* Add any log records */
1827                 if ( si->si_logs && op->o_tag != LDAP_REQ_ADD ) {
1828                         syncprov_add_slog( op );
1829                 }
1830 leave:          ldap_pvt_thread_mutex_unlock( &si->si_resp_mutex );
1831         }
1832         return SLAP_CB_CONTINUE;
1833 }
1834
1835 /* We don't use a subentry to store the context CSN any more.
1836  * We expose the current context CSN as an operational attribute
1837  * of the suffix entry.
1838  */
1839 static int
1840 syncprov_op_compare( Operation *op, SlapReply *rs )
1841 {
1842         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1843         syncprov_info_t         *si = on->on_bi.bi_private;
1844         int rc = SLAP_CB_CONTINUE;
1845
1846         if ( dn_match( &op->o_req_ndn, &si->si_contextdn ) &&
1847                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1848         {
1849                 Entry e = {0};
1850                 Attribute a = {0};
1851
1852                 e.e_name = si->si_contextdn;
1853                 e.e_nname = si->si_contextdn;
1854                 e.e_attrs = &a;
1855
1856                 a.a_desc = slap_schema.si_ad_contextCSN;
1857
1858                 ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1859
1860                 a.a_vals = si->si_ctxcsn;
1861                 a.a_nvals = a.a_vals;
1862                 a.a_numvals = si->si_numcsns;
1863
1864                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1865                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1866                 if ( ! rs->sr_err ) {
1867                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1868                         goto return_results;
1869                 }
1870
1871                 if ( get_assert( op ) &&
1872                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
1873                 {
1874                         rs->sr_err = LDAP_ASSERTION_FAILED;
1875                         goto return_results;
1876                 }
1877
1878
1879                 rs->sr_err = LDAP_COMPARE_FALSE;
1880
1881                 if ( attr_valfind( &a,
1882                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
1883                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
1884                                 &op->oq_compare.rs_ava->aa_value, NULL, op->o_tmpmemctx ) == 0 )
1885                 {
1886                         rs->sr_err = LDAP_COMPARE_TRUE;
1887                 }
1888
1889 return_results:;
1890
1891                 ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1892
1893                 send_ldap_result( op, rs );
1894
1895                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
1896                         rs->sr_err = LDAP_SUCCESS;
1897                 }
1898                 rc = rs->sr_err;
1899         }
1900
1901         return rc;
1902 }
1903
1904 static int
1905 syncprov_op_mod( Operation *op, SlapReply *rs )
1906 {
1907         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1908         syncprov_info_t         *si = on->on_bi.bi_private;
1909         slap_callback *cb;
1910         opcookie *opc;
1911         int have_psearches, cbsize;
1912
1913         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1914         have_psearches = ( si->si_ops != NULL );
1915         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1916
1917         cbsize = sizeof(slap_callback) + sizeof(opcookie) +
1918                 (have_psearches ? sizeof(modinst) : 0 );
1919
1920         cb = op->o_tmpcalloc(1, cbsize, op->o_tmpmemctx);
1921         opc = (opcookie *)(cb+1);
1922         opc->son = on;
1923         cb->sc_response = syncprov_op_response;
1924         cb->sc_cleanup = syncprov_op_cleanup;
1925         cb->sc_private = opc;
1926         cb->sc_next = op->o_callback;
1927         op->o_callback = cb;
1928
1929         opc->osid = -1;
1930         opc->rsid = -1;
1931         if ( op->o_csn.bv_val ) {
1932                 opc->osid = slap_parse_csn_sid( &op->o_csn );
1933         }
1934         if ( op->o_controls ) {
1935                 struct sync_cookie *scook =
1936                 op->o_controls[slap_cids.sc_LDAPsync];
1937                 if ( scook )
1938                         opc->rsid = scook->sid;
1939         }
1940
1941         /* If there are active persistent searches, lock this operation.
1942          * See seqmod.c for the locking logic on its own.
1943          */
1944         if ( have_psearches ) {
1945                 modtarget *mt, mtdummy;
1946                 modinst *mi;
1947
1948                 mi = (modinst *)(opc+1);
1949                 mi->mi_op = op;
1950
1951                 /* See if we're already modifying this entry... */
1952                 mtdummy.mt_op = op;
1953                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1954                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1955                 if ( mt ) {
1956                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1957                         if ( mt->mt_mods == NULL ) {
1958                                 /* Cannot reuse this mt, as another thread is about
1959                                  * to release it in syncprov_op_cleanup.
1960                                  */
1961                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1962                                 mt = NULL;
1963                         }
1964                 }
1965                 if ( mt ) {
1966                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1967                         mt->mt_tail->mi_next = mi;
1968                         mt->mt_tail = mi;
1969                         /* wait for this op to get to head of list */
1970                         while ( mt->mt_mods != mi ) {
1971                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1972                                 /* FIXME: if dynamic config can delete overlays or
1973                                  * databases we'll have to check for cleanup here.
1974                                  * Currently it's not an issue because there are
1975                                  * no dynamic config deletes...
1976                                  */
1977                                 if ( slapd_shutdown )
1978                                         return SLAPD_ABANDON;
1979
1980                                 if ( !ldap_pvt_thread_pool_pausecheck( &connection_pool ))
1981                                         ldap_pvt_thread_yield();
1982                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1983
1984                                 /* clean up if the caller is giving up */
1985                                 if ( op->o_abandon ) {
1986                                         modinst *m2;
1987                                         for ( m2 = mt->mt_mods; m2->mi_next != mi;
1988                                                 m2 = m2->mi_next );
1989                                         m2->mi_next = mi->mi_next;
1990                                         if ( mt->mt_tail == mi ) mt->mt_tail = m2;
1991                                         op->o_tmpfree( cb, op->o_tmpmemctx );
1992                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1993                                         return SLAPD_ABANDON;
1994                                 }
1995                         }
1996                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1997                 } else {
1998                         /* Record that we're modifying this entry now */
1999                         mt = ch_malloc( sizeof(modtarget) );
2000                         mt->mt_mods = mi;
2001                         mt->mt_tail = mi;
2002                         mt->mt_op = mi->mi_op;
2003                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
2004                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
2005                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
2006                 }
2007                 opc->smt = mt;
2008         }
2009
2010         if (( have_psearches || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
2011                 syncprov_matchops( op, opc, 1 );
2012
2013         return SLAP_CB_CONTINUE;
2014 }
2015
2016 static int
2017 syncprov_op_extended( Operation *op, SlapReply *rs )
2018 {
2019         if ( exop_is_write( op ))
2020                 return syncprov_op_mod( op, rs );
2021
2022         return SLAP_CB_CONTINUE;
2023 }
2024
2025 typedef struct searchstate {
2026         slap_overinst *ss_on;
2027         syncops *ss_so;
2028         BerVarray ss_ctxcsn;
2029         int *ss_sids;
2030         int ss_numcsns;
2031 #define SS_PRESENT      0x01
2032 #define SS_CHANGED      0x02
2033         int ss_flags;
2034 } searchstate;
2035
2036 static int
2037 syncprov_search_cleanup( Operation *op, SlapReply *rs )
2038 {
2039         if ( rs->sr_ctrls ) {
2040                 op->o_tmpfree( rs->sr_ctrls[0], op->o_tmpmemctx );
2041                 op->o_tmpfree( rs->sr_ctrls, op->o_tmpmemctx );
2042                 rs->sr_ctrls = NULL;
2043         }
2044         return 0;
2045 }
2046
2047 typedef struct SyncOperationBuffer {
2048         Operation               sob_op;
2049         Opheader                sob_hdr;
2050         OpExtra                 sob_oe;
2051         AttributeName   sob_extra;      /* not always present */
2052         /* Further data allocated here */
2053 } SyncOperationBuffer;
2054
2055 static void
2056 syncprov_detach_op( Operation *op, syncops *so, slap_overinst *on )
2057 {
2058         SyncOperationBuffer *sopbuf2;
2059         Operation *op2;
2060         int i, alen = 0;
2061         size_t size;
2062         char *ptr;
2063         GroupAssertion *g1, *g2;
2064
2065         /* count the search attrs */
2066         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2067                 alen += op->ors_attrs[i].an_name.bv_len + 1;
2068         }
2069         /* Make a new copy of the operation */
2070         size = offsetof( SyncOperationBuffer, sob_extra ) +
2071                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
2072                 op->o_req_dn.bv_len + 1 +
2073                 op->o_req_ndn.bv_len + 1 +
2074                 op->o_ndn.bv_len + 1 +
2075                 so->s_filterstr.bv_len + 1;
2076         sopbuf2 = ch_calloc( 1, size );
2077         op2 = &sopbuf2->sob_op;
2078         op2->o_hdr = &sopbuf2->sob_hdr;
2079         LDAP_SLIST_FIRST(&op2->o_extra) = &sopbuf2->sob_oe;
2080
2081         /* Copy the fields we care about explicitly, leave the rest alone */
2082         *op2->o_hdr = *op->o_hdr;
2083         op2->o_tag = op->o_tag;
2084         op2->o_time = op->o_time;
2085         op2->o_bd = on->on_info->oi_origdb;
2086         op2->o_request = op->o_request;
2087         op2->o_managedsait = op->o_managedsait;
2088         LDAP_SLIST_FIRST(&op2->o_extra)->oe_key = on;
2089         LDAP_SLIST_NEXT(LDAP_SLIST_FIRST(&op2->o_extra), oe_next) = NULL;
2090
2091         ptr = (char *) sopbuf2 + offsetof( SyncOperationBuffer, sob_extra );
2092         if ( i ) {
2093                 op2->ors_attrs = (AttributeName *) ptr;
2094                 ptr = (char *) &op2->ors_attrs[i+1];
2095                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2096                         op2->ors_attrs[i] = op->ors_attrs[i];
2097                         op2->ors_attrs[i].an_name.bv_val = ptr;
2098                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
2099                 }
2100                 BER_BVZERO( &op2->ors_attrs[i].an_name );
2101         }
2102
2103         op2->o_authz = op->o_authz;
2104         op2->o_ndn.bv_val = ptr;
2105         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
2106         op2->o_dn = op2->o_ndn;
2107         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
2108         op2->o_req_dn.bv_val = ptr;
2109         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
2110         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
2111         op2->o_req_ndn.bv_val = ptr;
2112         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
2113         op2->ors_filterstr.bv_val = ptr;
2114         strcpy( ptr, so->s_filterstr.bv_val );
2115         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
2116
2117         /* Skip the AND/GE clause that we stuck on in front */
2118         if ( so->s_flags & PS_FIX_FILTER ) {
2119                 op2->ors_filter = op->ors_filter->f_and->f_next;
2120                 so->s_flags ^= PS_FIX_FILTER;
2121         } else {
2122                 op2->ors_filter = op->ors_filter;
2123         }
2124         op2->ors_filter = filter_dup( op2->ors_filter, NULL );
2125         so->s_op = op2;
2126
2127         /* Copy any cached group ACLs individually */
2128         op2->o_groups = NULL;
2129         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
2130                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
2131                 *g2 = *g1;
2132                 strcpy( g2->ga_ndn, g1->ga_ndn );
2133                 g2->ga_next = op2->o_groups;
2134                 op2->o_groups = g2;
2135         }
2136         /* Don't allow any further group caching */
2137         op2->o_do_not_cache = 1;
2138
2139         /* Add op2 to conn so abandon will find us */
2140         op->o_conn->c_n_ops_executing++;
2141         op->o_conn->c_n_ops_completed--;
2142         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
2143         so->s_flags |= PS_IS_DETACHED;
2144
2145         /* Prevent anyone else from trying to send a result for this op */
2146         op->o_abandon = 1;
2147 }
2148
2149 static int
2150 syncprov_search_response( Operation *op, SlapReply *rs )
2151 {
2152         searchstate *ss = op->o_callback->sc_private;
2153         slap_overinst *on = ss->ss_on;
2154         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2155         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
2156
2157         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
2158                 Attribute *a;
2159                 /* If we got a referral without a referral object, there's
2160                  * something missing that we cannot replicate. Just ignore it.
2161                  * The consumer will abort because we didn't send the expected
2162                  * control.
2163                  */
2164                 if ( !rs->sr_entry ) {
2165                         assert( rs->sr_entry != NULL );
2166                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
2167                         return SLAP_CB_CONTINUE;
2168                 }
2169                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryCSN );
2170                 if ( a == NULL && rs->sr_operational_attrs != NULL ) {
2171                         a = attr_find( rs->sr_operational_attrs, slap_schema.si_ad_entryCSN );
2172                 }
2173                 if ( a ) {
2174                         int i, sid;
2175                         sid = slap_parse_csn_sid( &a->a_nvals[0] );
2176
2177                         /* Don't send changed entries back to the originator */
2178                         if ( sid == srs->sr_state.sid && srs->sr_state.numcsns ) {
2179                                 Debug( LDAP_DEBUG_SYNC,
2180                                         "Entry %s changed by peer, ignored\n",
2181                                         rs->sr_entry->e_name.bv_val, 0, 0 );
2182                                 return LDAP_SUCCESS;
2183                         }
2184
2185                         /* If not a persistent search */
2186                         if ( !ss->ss_so ) {
2187                                 /* Make sure entry is less than the snapshot'd contextCSN */
2188                                 for ( i=0; i<ss->ss_numcsns; i++ ) {
2189                                         if ( sid == ss->ss_sids[i] && ber_bvcmp( &a->a_nvals[0],
2190                                                 &ss->ss_ctxcsn[i] ) > 0 ) {
2191                                                 Debug( LDAP_DEBUG_SYNC,
2192                                                         "Entry %s CSN %s greater than snapshot %s\n",
2193                                                         rs->sr_entry->e_name.bv_val,
2194                                                         a->a_nvals[0].bv_val,
2195                                                         ss->ss_ctxcsn[i].bv_val );
2196                                                 return LDAP_SUCCESS;
2197                                         }
2198                                 }
2199                         }
2200
2201                         /* Don't send old entries twice */
2202                         if ( srs->sr_state.ctxcsn ) {
2203                                 for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2204                                         if ( sid == srs->sr_state.sids[i] &&
2205                                                 ber_bvcmp( &a->a_nvals[0],
2206                                                         &srs->sr_state.ctxcsn[i] )<= 0 ) {
2207                                                 Debug( LDAP_DEBUG_SYNC,
2208                                                         "Entry %s CSN %s older or equal to ctx %s\n",
2209                                                         rs->sr_entry->e_name.bv_val,
2210                                                         a->a_nvals[0].bv_val,
2211                                                         srs->sr_state.ctxcsn[i].bv_val );
2212                                                 return LDAP_SUCCESS;
2213                                         }
2214                                 }
2215                         }
2216                 }
2217                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2218                         op->o_tmpmemctx );
2219                 rs->sr_ctrls[1] = NULL;
2220                 /* If we're in delta-sync mode, always send a cookie */
2221                 if ( si->si_nopres && si->si_usehint && a ) {
2222                         struct berval cookie;
2223                         slap_compose_sync_cookie( op, &cookie, a->a_nvals, srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2224                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2225                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 1, &cookie );
2226                 } else {
2227                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2228                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
2229                 }
2230         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
2231                 struct berval cookie = BER_BVNULL;
2232
2233                 if ( ( ss->ss_flags & SS_CHANGED ) &&
2234                         ss->ss_ctxcsn && !BER_BVISNULL( &ss->ss_ctxcsn[0] )) {
2235                         slap_compose_sync_cookie( op, &cookie, ss->ss_ctxcsn,
2236                                 srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2237
2238                         Debug( LDAP_DEBUG_SYNC, "syncprov_search_response: cookie=%s\n", cookie.bv_val, 0, 0 );
2239                 }
2240
2241                 /* Is this a regular refresh?
2242                  * Note: refresh never gets here if there were no changes
2243                  */
2244                 if ( !ss->ss_so ) {
2245                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2246                                 op->o_tmpmemctx );
2247                         rs->sr_ctrls[1] = NULL;
2248                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
2249                                 0, 1, &cookie, ( ss->ss_flags & SS_PRESENT ) ?  LDAP_SYNC_REFRESH_PRESENTS :
2250                                         LDAP_SYNC_REFRESH_DELETES );
2251                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2252                 } else {
2253                 /* It's RefreshAndPersist, transition to Persist phase */
2254                         syncprov_sendinfo( op, rs, ( ss->ss_flags & SS_PRESENT ) ?
2255                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
2256                                 ( ss->ss_flags & SS_CHANGED ) ? &cookie : NULL,
2257                                 1, NULL, 0 );
2258                         if ( !BER_BVISNULL( &cookie ))
2259                                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2260
2261                         /* Detach this Op from frontend control */
2262                         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
2263
2264                         /* But not if this connection was closed along the way */
2265                         if ( op->o_abandon ) {
2266                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2267                                 /* syncprov_ab_cleanup will free this syncop */
2268                                 return SLAPD_ABANDON;
2269
2270                         } else {
2271                                 ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
2272                                 /* Turn off the refreshing flag */
2273                                 ss->ss_so->s_flags ^= PS_IS_REFRESHING;
2274
2275                                 syncprov_detach_op( op, ss->ss_so, on );
2276
2277                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2278
2279                                 /* If there are queued responses, fire them off */
2280                                 if ( ss->ss_so->s_res )
2281                                         syncprov_qstart( ss->ss_so );
2282                                 ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
2283                         }
2284
2285                         return LDAP_SUCCESS;
2286                 }
2287         }
2288
2289         return SLAP_CB_CONTINUE;
2290 }
2291
2292 static int
2293 syncprov_op_search( Operation *op, SlapReply *rs )
2294 {
2295         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2296         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2297         slap_callback   *cb;
2298         int gotstate = 0, changed = 0, do_present = 0;
2299         syncops *sop = NULL;
2300         searchstate *ss;
2301         sync_control *srs;
2302         BerVarray ctxcsn;
2303         int i, *sids, numcsns;
2304         struct berval mincsn;
2305
2306         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
2307
2308         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
2309                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
2310                 return rs->sr_err;
2311         }
2312
2313         srs = op->o_controls[slap_cids.sc_LDAPsync];
2314
2315         /* If this is a persistent search, set it up right away */
2316         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
2317                 syncops so = {0};
2318                 fbase_cookie fc;
2319                 opcookie opc;
2320                 slap_callback sc;
2321
2322                 fc.fss = &so;
2323                 fc.fbase = 0;
2324                 so.s_eid = NOID;
2325                 so.s_op = op;
2326                 so.s_flags = PS_IS_REFRESHING | PS_FIND_BASE;
2327                 /* syncprov_findbase expects to be called as a callback... */
2328                 sc.sc_private = &opc;
2329                 opc.son = on;
2330                 ldap_pvt_thread_mutex_init( &so.s_mutex );
2331                 cb = op->o_callback;
2332                 op->o_callback = &sc;
2333                 rs->sr_err = syncprov_findbase( op, &fc );
2334                 op->o_callback = cb;
2335                 ldap_pvt_thread_mutex_destroy( &so.s_mutex );
2336
2337                 if ( rs->sr_err != LDAP_SUCCESS ) {
2338                         send_ldap_result( op, rs );
2339                         return rs->sr_err;
2340                 }
2341                 sop = ch_malloc( sizeof( syncops ));
2342                 *sop = so;
2343                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
2344                 sop->s_rid = srs->sr_state.rid;
2345                 sop->s_sid = srs->sr_state.sid;
2346                 sop->s_inuse = 1;
2347
2348                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2349                 sop->s_next = si->si_ops;
2350                 si->si_ops = sop;
2351                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2352         }
2353
2354         /* snapshot the ctxcsn */
2355         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2356         numcsns = si->si_numcsns;
2357         if ( numcsns ) {
2358                 ber_bvarray_dup_x( &ctxcsn, si->si_ctxcsn, op->o_tmpmemctx );
2359                 sids = op->o_tmpalloc( numcsns * sizeof(int), op->o_tmpmemctx );
2360                 for ( i=0; i<numcsns; i++ )
2361                         sids[i] = si->si_sids[i];
2362         } else {
2363                 ctxcsn = NULL;
2364                 sids = NULL;
2365         }
2366         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2367
2368         /* If we have a cookie, handle the PRESENT lookups */
2369         if ( srs->sr_state.ctxcsn ) {
2370                 sessionlog *sl;
2371                 int i, j;
2372
2373                 /* If we don't have any CSN of our own yet, pretend nothing
2374                  * has changed.
2375                  */
2376                 if ( !numcsns )
2377                         goto no_change;
2378
2379                 if ( !si->si_nopres )
2380                         do_present = SS_PRESENT;
2381
2382                 /* If there are SIDs we don't recognize in the cookie, drop them */
2383                 for (i=0; i<srs->sr_state.numcsns; ) {
2384                         for (j=0; j<numcsns; j++) {
2385                                 if ( srs->sr_state.sids[i] == sids[j] ) {
2386                                         break;
2387                                 }
2388                         }
2389                         /* not found */
2390                         if ( j == numcsns ) {
2391                                 struct berval tmp = srs->sr_state.ctxcsn[i];
2392                                 j = srs->sr_state.numcsns - 1;
2393                                 srs->sr_state.ctxcsn[i] = srs->sr_state.ctxcsn[j];
2394                                 tmp.bv_len = 0;
2395                                 srs->sr_state.ctxcsn[j] = tmp;
2396                                 srs->sr_state.numcsns = j;
2397                                 srs->sr_state.sids[i] = srs->sr_state.sids[j];
2398                                 continue;
2399                         }
2400                         i++;
2401                 }
2402
2403                 /* Find the smallest CSN */
2404                 mincsn = srs->sr_state.ctxcsn[0];
2405                 for ( i=1; i<srs->sr_state.numcsns; i++ ) {
2406                         if ( ber_bvcmp( &mincsn, &srs->sr_state.ctxcsn[i] ) > 0 )
2407                                 mincsn = srs->sr_state.ctxcsn[i];
2408                 }
2409
2410                 /* If nothing has changed, shortcut it */
2411                 if ( srs->sr_state.numcsns == numcsns ) {
2412                         int i, j, newer;
2413                         for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2414                                 for ( j=0; j<numcsns; j++ ) {
2415                                         if ( srs->sr_state.sids[i] != sids[j] )
2416                                                 continue;
2417                                         newer = ber_bvcmp( &srs->sr_state.ctxcsn[i], &ctxcsn[j] );
2418                                         /* If our state is newer, tell consumer about changes */
2419                                         if ( newer < 0 )
2420                                                 changed = SS_CHANGED;
2421                                         else if ( newer > 0 ) {
2422                                         /* our state is older, tell consumer nothing */
2423                                                 if ( sop ) {
2424                                                         syncops **sp = &si->si_ops;
2425
2426                                                         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2427                                                         while ( *sp != sop )
2428                                                                 sp = &(*sp)->s_next;
2429                                                         *sp = sop->s_next;
2430                                                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2431                                                         ch_free( sop );
2432                                                 }
2433                                                 rs->sr_err = LDAP_SUCCESS;
2434                                                 rs->sr_ctrls = NULL;
2435                                                 send_ldap_result( op, rs );
2436                                                 return rs->sr_err;
2437                                         }
2438                                         break;
2439                                 }
2440                                 if ( changed )
2441                                         break;
2442                         }
2443                         if ( !changed ) {
2444                                 do_present = 0;
2445 no_change:              if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
2446                                         LDAPControl     *ctrls[2];
2447
2448                                         ctrls[0] = NULL;
2449                                         ctrls[1] = NULL;
2450                                         syncprov_done_ctrl( op, rs, ctrls, 0, 0,
2451                                                 NULL, LDAP_SYNC_REFRESH_DELETES );
2452                                         rs->sr_ctrls = ctrls;
2453                                         rs->sr_err = LDAP_SUCCESS;
2454                                         send_ldap_result( op, rs );
2455                                         rs->sr_ctrls = NULL;
2456                                         return rs->sr_err;
2457                                 }
2458                                 goto shortcut;
2459                         }
2460                 } else {
2461                         /* consumer doesn't have the right number of CSNs */
2462                         changed = SS_CHANGED;
2463                 }
2464                 /* Do we have a sessionlog for this search? */
2465                 sl=si->si_logs;
2466                 if ( sl ) {
2467                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
2468                         /* Are there any log entries, and is the consumer state
2469                          * present in the session log?
2470                          */
2471                         if ( sl->sl_num > 0 && ber_bvcmp( &mincsn, &sl->sl_mincsn ) >= 0 ) {
2472                                 do_present = 0;
2473                                 /* mutex is unlocked in playlog */
2474                                 syncprov_playlog( op, rs, sl, srs, ctxcsn, numcsns, sids );
2475                         } else {
2476                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
2477                         }
2478                 }
2479                 /* Is the CSN still present in the database? */
2480                 if ( syncprov_findcsn( op, FIND_CSN ) != LDAP_SUCCESS ) {
2481                         /* No, so a reload is required */
2482                         /* the 2.2 consumer doesn't send this hint */
2483                         if ( si->si_usehint && srs->sr_rhint == 0 ) {
2484                                 if ( ctxcsn )
2485                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2486                                 if ( sids )
2487                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2488                                 send_ldap_error( op, rs, LDAP_SYNC_REFRESH_REQUIRED, "sync cookie is stale" );
2489                                 return rs->sr_err;
2490                         }
2491                         if ( srs->sr_state.ctxcsn ) {
2492                                 ber_bvarray_free_x( srs->sr_state.ctxcsn, op->o_tmpmemctx );
2493                                 srs->sr_state.ctxcsn = NULL;
2494                         }
2495                         if ( srs->sr_state.sids ) {
2496                                 slap_sl_free( srs->sr_state.sids, op->o_tmpmemctx );
2497                                 srs->sr_state.sids = NULL;
2498                         }
2499                         srs->sr_state.numcsns = 0;
2500                 } else {
2501                         gotstate = 1;
2502                         /* If changed and doing Present lookup, send Present UUIDs */
2503                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT ) !=
2504                                 LDAP_SUCCESS ) {
2505                                 if ( ctxcsn )
2506                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2507                                 if ( sids )
2508                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2509                                 send_ldap_result( op, rs );
2510                                 return rs->sr_err;
2511                         }
2512                 }
2513         } else {
2514                 /* No consumer state, assume something has changed */
2515                 changed = SS_CHANGED;
2516         }
2517
2518 shortcut:
2519         /* Append CSN range to search filter, save original filter
2520          * for persistent search evaluation
2521          */
2522         if ( sop ) {
2523                 sop->s_filterstr= op->ors_filterstr;
2524         }
2525
2526         /* If something changed, find the changes */
2527         if ( gotstate && changed ) {
2528                 Filter *fand, *fava;
2529
2530                 fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2531                 fand->f_choice = LDAP_FILTER_AND;
2532                 fand->f_next = NULL;
2533                 fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2534                 fand->f_and = fava;
2535                 fava->f_choice = LDAP_FILTER_GE;
2536                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
2537                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
2538 #ifdef LDAP_COMP_MATCH
2539                 fava->f_ava->aa_cf = NULL;
2540 #endif
2541                 ber_dupbv_x( &fava->f_ava->aa_value, &mincsn, op->o_tmpmemctx );
2542                 fava->f_next = op->ors_filter;
2543                 op->ors_filter = fand;
2544                 filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
2545                 if ( sop )
2546                         sop->s_flags |= PS_FIX_FILTER;
2547         }
2548
2549         /* Let our callback add needed info to returned entries */
2550         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
2551         ss = (searchstate *)(cb+1);
2552         ss->ss_on = on;
2553         ss->ss_so = sop;
2554         ss->ss_flags = do_present | changed;
2555         ss->ss_ctxcsn = ctxcsn;
2556         ss->ss_numcsns = numcsns;
2557         ss->ss_sids = sids;
2558         cb->sc_response = syncprov_search_response;
2559         cb->sc_cleanup = syncprov_search_cleanup;
2560         cb->sc_private = ss;
2561         cb->sc_next = op->o_callback;
2562         op->o_callback = cb;
2563
2564         /* If this is a persistent search and no changes were reported during
2565          * the refresh phase, just invoke the response callback to transition
2566          * us into persist phase
2567          */
2568         if ( !changed ) {
2569                 rs->sr_err = LDAP_SUCCESS;
2570                 rs->sr_nentries = 0;
2571                 send_ldap_result( op, rs );
2572                 return rs->sr_err;
2573         }
2574         return SLAP_CB_CONTINUE;
2575 }
2576
2577 static int
2578 syncprov_operational(
2579         Operation *op,
2580         SlapReply *rs )
2581 {
2582         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2583         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2584
2585         /* This prevents generating unnecessarily; frontend will strip
2586          * any statically stored copy.
2587          */
2588         if ( op->o_sync != SLAP_CONTROL_NONE )
2589                 return SLAP_CB_CONTINUE;
2590
2591         if ( rs->sr_entry &&
2592                 dn_match( &rs->sr_entry->e_nname, &si->si_contextdn )) {
2593
2594                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
2595                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
2596                         Attribute *a, **ap = NULL;
2597
2598                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
2599                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
2600                                         break;
2601                         }
2602
2603                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2604                         if ( si->si_ctxcsn ) {
2605                                 if ( !a ) {
2606                                         for ( ap = &rs->sr_operational_attrs; *ap;
2607                                                 ap=&(*ap)->a_next );
2608
2609                                         a = attr_alloc( slap_schema.si_ad_contextCSN );
2610                                         *ap = a;
2611                                 }
2612
2613                                 if ( !ap ) {
2614                                         if ( !(rs->sr_flags & REP_ENTRY_MODIFIABLE) ) {
2615                                                 Entry *e = entry_dup( rs->sr_entry );
2616                                                 if ( rs->sr_flags & REP_ENTRY_MUSTRELEASE ) {
2617                                                         overlay_entry_release_ov( op, rs->sr_entry, 0, on );
2618                                                         rs->sr_flags ^= REP_ENTRY_MUSTRELEASE;
2619                                                 } else if ( rs->sr_flags & REP_ENTRY_MUSTBEFREED ) {
2620                                                         entry_free( rs->sr_entry );
2621                                                 }
2622                                                 rs->sr_entry = e;
2623                                                 rs->sr_flags |=
2624                                                         REP_ENTRY_MODIFIABLE|REP_ENTRY_MUSTBEFREED;
2625                                                 a = attr_find( rs->sr_entry->e_attrs,
2626                                                         slap_schema.si_ad_contextCSN );
2627                                         }
2628                                         if ( a->a_nvals != a->a_vals ) {
2629                                                 ber_bvarray_free( a->a_nvals );
2630                                         }
2631                                         a->a_nvals = NULL;
2632                                         ber_bvarray_free( a->a_vals );
2633                                         a->a_vals = NULL;
2634                                         a->a_numvals = 0;
2635                                 }
2636                                 attr_valadd( a, si->si_ctxcsn, si->si_ctxcsn, si->si_numcsns );
2637                         }
2638                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2639                 }
2640         }
2641         return SLAP_CB_CONTINUE;
2642 }
2643
2644 enum {
2645         SP_CHKPT = 1,
2646         SP_SESSL,
2647         SP_NOPRES,
2648         SP_USEHINT
2649 };
2650
2651 static ConfigDriver sp_cf_gen;
2652
2653 static ConfigTable spcfg[] = {
2654         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2655                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2656                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2657                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2658         { "syncprov-sessionlog", "ops", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2659                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2660                         "DESC 'Session log size in ops' "
2661                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2662         { "syncprov-nopresent", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_NOPRES,
2663                 sp_cf_gen, "( OLcfgOvAt:1.3 NAME 'olcSpNoPresent' "
2664                         "DESC 'Omit Present phase processing' "
2665                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2666         { "syncprov-reloadhint", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_USEHINT,
2667                 sp_cf_gen, "( OLcfgOvAt:1.4 NAME 'olcSpReloadHint' "
2668                         "DESC 'Observe Reload Hint in Request control' "
2669                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2670         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2671 };
2672
2673 static ConfigOCs spocs[] = {
2674         { "( OLcfgOvOc:1.1 "
2675                 "NAME 'olcSyncProvConfig' "
2676                 "DESC 'SyncRepl Provider configuration' "
2677                 "SUP olcOverlayConfig "
2678                 "MAY ( olcSpCheckpoint "
2679                         "$ olcSpSessionlog "
2680                         "$ olcSpNoPresent "
2681                         "$ olcSpReloadHint "
2682                 ") )",
2683                         Cft_Overlay, spcfg },
2684         { NULL, 0, NULL }
2685 };
2686
2687 static int
2688 sp_cf_gen(ConfigArgs *c)
2689 {
2690         slap_overinst           *on = (slap_overinst *)c->bi;
2691         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2692         int rc = 0;
2693
2694         if ( c->op == SLAP_CONFIG_EMIT ) {
2695                 switch ( c->type ) {
2696                 case SP_CHKPT:
2697                         if ( si->si_chkops || si->si_chktime ) {
2698                                 struct berval bv;
2699                                 /* we assume si_chktime is a multiple of 60
2700                                  * because the parsed value was originally
2701                                  * multiplied by 60 */
2702                                 bv.bv_len = snprintf( c->cr_msg, sizeof( c->cr_msg ),
2703                                         "%d %d", si->si_chkops, si->si_chktime/60 );
2704                                 if ( bv.bv_len >= sizeof( c->cr_msg ) ) {
2705                                         rc = 1;
2706                                 } else {
2707                                         bv.bv_val = c->cr_msg;
2708                                         value_add_one( &c->rvalue_vals, &bv );
2709                                 }
2710                         } else {
2711                                 rc = 1;
2712                         }
2713                         break;
2714                 case SP_SESSL:
2715                         if ( si->si_logs ) {
2716                                 c->value_int = si->si_logs->sl_size;
2717                         } else {
2718                                 rc = 1;
2719                         }
2720                         break;
2721                 case SP_NOPRES:
2722                         if ( si->si_nopres ) {
2723                                 c->value_int = 1;
2724                         } else {
2725                                 rc = 1;
2726                         }
2727                         break;
2728                 case SP_USEHINT:
2729                         if ( si->si_usehint ) {
2730                                 c->value_int = 1;
2731                         } else {
2732                                 rc = 1;
2733                         }
2734                         break;
2735                 }
2736                 return rc;
2737         } else if ( c->op == LDAP_MOD_DELETE ) {
2738                 switch ( c->type ) {
2739                 case SP_CHKPT:
2740                         si->si_chkops = 0;
2741                         si->si_chktime = 0;
2742                         break;
2743                 case SP_SESSL:
2744                         if ( si->si_logs )
2745                                 si->si_logs->sl_size = 0;
2746                         else
2747                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2748                         break;
2749                 case SP_NOPRES:
2750                         if ( si->si_nopres )
2751                                 si->si_nopres = 0;
2752                         else
2753                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2754                         break;
2755                 case SP_USEHINT:
2756                         if ( si->si_usehint )
2757                                 si->si_usehint = 0;
2758                         else
2759                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2760                         break;
2761                 }
2762                 return rc;
2763         }
2764         switch ( c->type ) {
2765         case SP_CHKPT:
2766                 if ( lutil_atoi( &si->si_chkops, c->argv[1] ) != 0 ) {
2767                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint ops # \"%s\"",
2768                                 c->argv[0], c->argv[1] );
2769                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2770                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2771                         return ARG_BAD_CONF;
2772                 }
2773                 if ( si->si_chkops <= 0 ) {
2774                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint ops # \"%d\"",
2775                                 c->argv[0], si->si_chkops );
2776                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2777                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2778                         return ARG_BAD_CONF;
2779                 }
2780                 if ( lutil_atoi( &si->si_chktime, c->argv[2] ) != 0 ) {
2781                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint time \"%s\"",
2782                                 c->argv[0], c->argv[1] );
2783                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2784                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2785                         return ARG_BAD_CONF;
2786                 }
2787                 if ( si->si_chktime <= 0 ) {
2788                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint time \"%d\"",
2789                                 c->argv[0], si->si_chkops );
2790                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2791                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2792                         return ARG_BAD_CONF;
2793                 }
2794                 si->si_chktime *= 60;
2795                 break;
2796         case SP_SESSL: {
2797                 sessionlog *sl;
2798                 int size = c->value_int;
2799
2800                 if ( size < 0 ) {
2801                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s size %d is negative",
2802                                 c->argv[0], size );
2803                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2804                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2805                         return ARG_BAD_CONF;
2806                 }
2807                 sl = si->si_logs;
2808                 if ( !sl ) {
2809                         sl = ch_malloc( sizeof( sessionlog ) + LDAP_PVT_CSNSTR_BUFSIZE );
2810                         sl->sl_mincsn.bv_val = (char *)(sl+1);
2811                         sl->sl_mincsn.bv_len = 0;
2812                         sl->sl_num = 0;
2813                         sl->sl_head = sl->sl_tail = NULL;
2814                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
2815                         si->si_logs = sl;
2816                 }
2817                 sl->sl_size = size;
2818                 }
2819                 break;
2820         case SP_NOPRES:
2821                 si->si_nopres = c->value_int;
2822                 break;
2823         case SP_USEHINT:
2824                 si->si_usehint = c->value_int;
2825                 break;
2826         }
2827         return rc;
2828 }
2829
2830 /* ITS#3456 we cannot run this search on the main thread, must use a
2831  * child thread in order to insure we have a big enough stack.
2832  */
2833 static void *
2834 syncprov_db_otask(
2835         void *ptr
2836 )
2837 {
2838         syncprov_findcsn( ptr, FIND_MAXCSN );
2839         return NULL;
2840 }
2841
2842 /* Read any existing contextCSN from the underlying db.
2843  * Then search for any entries newer than that. If no value exists,
2844  * just generate it. Cache whatever result.
2845  */
2846 static int
2847 syncprov_db_open(
2848         BackendDB *be,
2849         ConfigReply *cr
2850 )
2851 {
2852         slap_overinst   *on = (slap_overinst *) be->bd_info;
2853         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2854
2855         Connection conn = { 0 };
2856         OperationBuffer opbuf;
2857         Operation *op;
2858         Entry *e = NULL;
2859         Attribute *a;
2860         int rc;
2861         void *thrctx = NULL;
2862
2863         if ( !SLAP_LASTMOD( be )) {
2864                 Debug( LDAP_DEBUG_ANY,
2865                         "syncprov_db_open: invalid config, lastmod must be enabled\n", 0, 0, 0 );
2866                 return -1;
2867         }
2868
2869         if ( slapMode & SLAP_TOOL_MODE ) {
2870                 return 0;
2871         }
2872
2873         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
2874         if ( rc ) {
2875                 return rc;
2876         }
2877
2878         thrctx = ldap_pvt_thread_pool_context();
2879         connection_fake_init( &conn, &opbuf, thrctx );
2880         op = &opbuf.ob_op;
2881         op->o_bd = be;
2882         op->o_dn = be->be_rootdn;
2883         op->o_ndn = be->be_rootndn;
2884
2885         if ( SLAP_SYNC_SUBENTRY( be )) {
2886                 build_new_dn( &si->si_contextdn, be->be_nsuffix,
2887                         (struct berval *)&slap_ldapsync_cn_bv, NULL );
2888         } else {
2889                 si->si_contextdn = be->be_nsuffix[0];
2890         }
2891         rc = overlay_entry_get_ov( op, &si->si_contextdn, NULL,
2892                 slap_schema.si_ad_contextCSN, 0, &e, on );
2893
2894         if ( e ) {
2895                 ldap_pvt_thread_t tid;
2896
2897                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
2898                 if ( a ) {
2899                         ber_bvarray_dup_x( &si->si_ctxcsn, a->a_vals, NULL );
2900                         si->si_numcsns = a->a_numvals;
2901                         si->si_sids = slap_parse_csn_sids( si->si_ctxcsn, a->a_numvals, NULL );
2902                 }
2903                 overlay_entry_release_ov( op, e, 0, on );
2904                 if ( si->si_ctxcsn && !SLAP_DBCLEAN( be )) {
2905                         op->o_req_dn = be->be_suffix[0];
2906                         op->o_req_ndn = be->be_nsuffix[0];
2907                         op->ors_scope = LDAP_SCOPE_SUBTREE;
2908                         ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
2909                         ldap_pvt_thread_join( tid, NULL );
2910                 }
2911         }
2912
2913         /* Didn't find a contextCSN, should we generate one? */
2914         if ( !si->si_ctxcsn ) {
2915                 char csnbuf[ LDAP_PVT_CSNSTR_BUFSIZE ];
2916                 struct berval csn;
2917
2918                 if ( SLAP_SYNC_SHADOW( op->o_bd )) {
2919                 /* If we're also a consumer, then don't generate anything.
2920                  * Wait for our provider to send it to us, or for a local
2921                  * modify if we have multimaster.
2922                  */
2923                         goto out;
2924                 }
2925                 csn.bv_val = csnbuf;
2926                 csn.bv_len = sizeof( csnbuf );
2927                 slap_get_csn( op, &csn, 0 );
2928                 value_add_one( &si->si_ctxcsn, &csn );
2929                 si->si_numcsns = 1;
2930                 si->si_sids = ch_malloc( sizeof(int) );
2931                 si->si_sids[0] = slap_serverID;
2932
2933                 /* make sure we do a checkpoint on close */
2934                 si->si_numops++;
2935         }
2936
2937 out:
2938         op->o_bd->bd_info = (BackendInfo *)on;
2939         return 0;
2940 }
2941
2942 /* Write the current contextCSN into the underlying db.
2943  */
2944 static int
2945 syncprov_db_close(
2946         BackendDB *be,
2947         ConfigReply *cr
2948 )
2949 {
2950     slap_overinst   *on = (slap_overinst *) be->bd_info;
2951     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2952
2953         if ( slapMode & SLAP_TOOL_MODE ) {
2954                 return 0;
2955         }
2956         if ( si->si_numops ) {
2957                 Connection conn = {0};
2958                 OperationBuffer opbuf;
2959                 Operation *op;
2960                 SlapReply rs = {REP_RESULT};
2961                 void *thrctx;
2962
2963                 thrctx = ldap_pvt_thread_pool_context();
2964                 connection_fake_init( &conn, &opbuf, thrctx );
2965                 op = &opbuf.ob_op;
2966                 op->o_bd = be;
2967                 op->o_dn = be->be_rootdn;
2968                 op->o_ndn = be->be_rootndn;
2969                 syncprov_checkpoint( op, &rs, on );
2970         }
2971
2972     return 0;
2973 }
2974
2975 static int
2976 syncprov_db_init(
2977         BackendDB *be,
2978         ConfigReply *cr
2979 )
2980 {
2981         slap_overinst   *on = (slap_overinst *)be->bd_info;
2982         syncprov_info_t *si;
2983
2984         if ( SLAP_ISGLOBALOVERLAY( be ) ) {
2985                 Debug( LDAP_DEBUG_ANY,
2986                         "syncprov must be instantiated within a database.\n",
2987                         0, 0, 0 );
2988                 return 1;
2989         }
2990
2991         si = ch_calloc(1, sizeof(syncprov_info_t));
2992         on->on_bi.bi_private = si;
2993         ldap_pvt_thread_rdwr_init( &si->si_csn_rwlock );
2994         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
2995         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
2996         ldap_pvt_thread_mutex_init( &si->si_resp_mutex );
2997
2998         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
2999         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
3000         csn_anlist[1].an_desc = slap_schema.si_ad_entryUUID;
3001         csn_anlist[1].an_name = slap_schema.si_ad_entryUUID->ad_cname;
3002
3003         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
3004         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
3005
3006         return 0;
3007 }
3008
3009 static int
3010 syncprov_db_destroy(
3011         BackendDB *be,
3012         ConfigReply *cr
3013 )
3014 {
3015         slap_overinst   *on = (slap_overinst *)be->bd_info;
3016         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3017
3018         if ( si ) {
3019                 if ( si->si_logs ) {
3020                         slog_entry *se = si->si_logs->sl_head;
3021
3022                         while ( se ) {
3023                                 slog_entry *se_next = se->se_next;
3024                                 ch_free( se );
3025                                 se = se_next;
3026                         }
3027
3028                         ch_free( si->si_logs );
3029                 }
3030                 if ( si->si_ctxcsn )
3031                         ber_bvarray_free( si->si_ctxcsn );
3032                 if ( si->si_sids )
3033                         ch_free( si->si_sids );
3034                 ldap_pvt_thread_mutex_destroy( &si->si_resp_mutex );
3035                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
3036                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
3037                 ldap_pvt_thread_rdwr_destroy( &si->si_csn_rwlock );
3038                 ch_free( si );
3039         }
3040
3041         return 0;
3042 }
3043
3044 static int syncprov_parseCtrl (
3045         Operation *op,
3046         SlapReply *rs,
3047         LDAPControl *ctrl )
3048 {
3049         ber_tag_t tag;
3050         BerElementBuffer berbuf;
3051         BerElement *ber = (BerElement *)&berbuf;
3052         ber_int_t mode;
3053         ber_len_t len;
3054         struct berval cookie = BER_BVNULL;
3055         sync_control *sr;
3056         int rhint = 0;
3057
3058         if ( op->o_sync != SLAP_CONTROL_NONE ) {
3059                 rs->sr_text = "Sync control specified multiple times";
3060                 return LDAP_PROTOCOL_ERROR;
3061         }
3062
3063         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
3064                 rs->sr_text = "Sync control specified with pagedResults control";
3065                 return LDAP_PROTOCOL_ERROR;
3066         }
3067
3068         if ( BER_BVISNULL( &ctrl->ldctl_value ) ) {
3069                 rs->sr_text = "Sync control value is absent";
3070                 return LDAP_PROTOCOL_ERROR;
3071         }
3072
3073         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
3074                 rs->sr_text = "Sync control value is empty";
3075                 return LDAP_PROTOCOL_ERROR;
3076         }
3077
3078         /* Parse the control value
3079          *      syncRequestValue ::= SEQUENCE {
3080          *              mode   ENUMERATED {
3081          *                      -- 0 unused
3082          *                      refreshOnly             (1),
3083          *                      -- 2 reserved
3084          *                      refreshAndPersist       (3)
3085          *              },
3086          *              cookie  syncCookie OPTIONAL
3087          *      }
3088          */
3089
3090         ber_init2( ber, &ctrl->ldctl_value, 0 );
3091
3092         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
3093                 rs->sr_text = "Sync control : mode decoding error";
3094                 return LDAP_PROTOCOL_ERROR;
3095         }
3096
3097         switch( mode ) {
3098         case LDAP_SYNC_REFRESH_ONLY:
3099                 mode = SLAP_SYNC_REFRESH;
3100                 break;
3101         case LDAP_SYNC_REFRESH_AND_PERSIST:
3102                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
3103                 break;
3104         default:
3105                 rs->sr_text = "Sync control : unknown update mode";
3106                 return LDAP_PROTOCOL_ERROR;
3107         }
3108
3109         tag = ber_peek_tag( ber, &len );
3110
3111         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
3112                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
3113                         rs->sr_text = "Sync control : cookie decoding error";
3114                         return LDAP_PROTOCOL_ERROR;
3115                 }
3116                 tag = ber_peek_tag( ber, &len );
3117         }
3118         if ( tag == LDAP_TAG_RELOAD_HINT ) {
3119                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
3120                         rs->sr_text = "Sync control : rhint decoding error";
3121                         return LDAP_PROTOCOL_ERROR;
3122                 }
3123         }
3124         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
3125                         rs->sr_text = "Sync control : decoding error";
3126                         return LDAP_PROTOCOL_ERROR;
3127         }
3128         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
3129         sr->sr_rhint = rhint;
3130         if (!BER_BVISNULL(&cookie)) {
3131                 ber_dupbv_x( &sr->sr_state.octet_str, &cookie, op->o_tmpmemctx );
3132                 /* If parse fails, pretend no cookie was sent */
3133                 if ( slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx ) ||
3134                         sr->sr_state.rid == -1 ) {
3135                         if ( sr->sr_state.ctxcsn ) {
3136                                 ber_bvarray_free_x( sr->sr_state.ctxcsn, op->o_tmpmemctx );
3137                                 sr->sr_state.ctxcsn = NULL;
3138                         }
3139                         sr->sr_state.numcsns = 0;
3140                 }
3141         }
3142
3143         op->o_controls[slap_cids.sc_LDAPsync] = sr;
3144
3145         op->o_sync = ctrl->ldctl_iscritical
3146                 ? SLAP_CONTROL_CRITICAL
3147                 : SLAP_CONTROL_NONCRITICAL;
3148
3149         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
3150
3151         return LDAP_SUCCESS;
3152 }
3153
3154 /* This overlay is set up for dynamic loading via moduleload. For static
3155  * configuration, you'll need to arrange for the slap_overinst to be
3156  * initialized and registered by some other function inside slapd.
3157  */
3158
3159 static slap_overinst            syncprov;
3160
3161 int
3162 syncprov_initialize()
3163 {
3164         int rc;
3165
3166         rc = register_supported_control( LDAP_CONTROL_SYNC,
3167                 SLAP_CTRL_SEARCH, NULL,
3168                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
3169         if ( rc != LDAP_SUCCESS ) {
3170                 Debug( LDAP_DEBUG_ANY,
3171                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
3172                 return rc;
3173         }
3174
3175         syncprov.on_bi.bi_type = "syncprov";
3176         syncprov.on_bi.bi_db_init = syncprov_db_init;
3177         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
3178         syncprov.on_bi.bi_db_open = syncprov_db_open;
3179         syncprov.on_bi.bi_db_close = syncprov_db_close;
3180
3181         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
3182         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
3183
3184         syncprov.on_bi.bi_op_add = syncprov_op_mod;
3185         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
3186         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
3187         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
3188         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
3189         syncprov.on_bi.bi_op_search = syncprov_op_search;
3190         syncprov.on_bi.bi_extended = syncprov_op_extended;
3191         syncprov.on_bi.bi_operational = syncprov_operational;
3192
3193         syncprov.on_bi.bi_cf_ocs = spocs;
3194
3195         generic_filter.f_desc = slap_schema.si_ad_objectClass;
3196
3197         rc = config_register_schema( spcfg, spocs );
3198         if ( rc ) return rc;
3199
3200         return overlay_register( &syncprov );
3201 }
3202
3203 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
3204 int
3205 init_module( int argc, char *argv[] )
3206 {
3207         return syncprov_initialize();
3208 }
3209 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
3210
3211 #endif /* defined(SLAPD_OVER_SYNCPROV) */