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

   1 /* $OpenLDAP$ */
   2 /* syncprov.c - syncrepl provider */
   3 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   4  *
   5  * Copyright 2004-2010 The OpenLDAP Foundation.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted only as authorized by the OpenLDAP
  10  * Public License.
  11  *
  12  * A copy of this license is available in the file LICENSE in the
  13  * top-level directory of the distribution or, alternatively, at
  14  * <http://www.OpenLDAP.org/license.html>.
  15  */
  16 /* ACKNOWLEDGEMENTS:
  17  * This work was initially developed by Howard Chu for inclusion in
  18  * OpenLDAP Software.
  19  */
  20
  21 #include "portable.h"
  22
  23 #ifdef SLAPD_OVER_SYNCPROV
  24
  25 #include <ac/string.h>
  26 #include "lutil.h"
  27 #include "slap.h"
  28 #include "config.h"
  29 #include "ldap_rq.h"
  30
  31 #ifdef LDAP_DEVEL
  32 #define CHECK_CSN       1
  33 #endif
  34
  35 /* A modify request on a particular entry */
  36 typedef struct modinst {
  37         struct modinst *mi_next;
  38         Operation *mi_op;
  39 } modinst;
  40
  41 typedef struct modtarget {
  42         struct modinst *mt_mods;
  43         struct modinst *mt_tail;
  44         Operation *mt_op;
  45         ldap_pvt_thread_mutex_t mt_mutex;
  46 } modtarget;
  47
  48 /* A queued result of a persistent search */
  49 typedef struct syncres {
  50         struct syncres *s_next;
  51         Entry *s_e;
  52         struct berval s_dn;
  53         struct berval s_ndn;
  54         struct berval s_uuid;
  55         struct berval s_csn;
  56         char s_mode;
  57         char s_isreference;
  58 } syncres;
  59
  60 /* Record of a persistent search */
  61 typedef struct syncops {
  62         struct syncops *s_next;
  63         struct berval   s_base;         /* ndn of search base */
  64         ID              s_eid;          /* entryID of search base */
  65         Operation       *s_op;          /* search op */
  66         int             s_rid;
  67         int             s_sid;
  68         struct berval s_filterstr;
  69         int             s_flags;        /* search status */
  70 #define PS_IS_REFRESHING        0x01
  71 #define PS_IS_DETACHED          0x02
  72 #define PS_WROTE_BASE           0x04
  73 #define PS_FIND_BASE            0x08
  74 #define PS_FIX_FILTER           0x10
  75 #define PS_TASK_QUEUED          0x20
  76
  77         int             s_inuse;        /* reference count */
  78         struct syncres *s_res;
  79         struct syncres *s_restail;
  80         ldap_pvt_thread_mutex_t s_mutex;
  81 } syncops;
  82
  83 /* A received sync control */
  84 typedef struct sync_control {
  85         struct sync_cookie sr_state;
  86         int sr_rhint;
  87 } sync_control;
  88
  89 #if 0 /* moved back to slap.h */
  90 #define o_sync  o_ctrlflag[slap_cids.sc_LDAPsync]
  91 #endif
  92 /* o_sync_mode uses data bits of o_sync */
  93 #define o_sync_mode     o_ctrlflag[slap_cids.sc_LDAPsync]
  94
  95 #define SLAP_SYNC_NONE                                  (LDAP_SYNC_NONE<<SLAP_CONTROL_SHIFT)
  96 #define SLAP_SYNC_REFRESH                               (LDAP_SYNC_REFRESH_ONLY<<SLAP_CONTROL_SHIFT)
  97 #define SLAP_SYNC_PERSIST                               (LDAP_SYNC_RESERVED<<SLAP_CONTROL_SHIFT)
  98 #define SLAP_SYNC_REFRESH_AND_PERSIST   (LDAP_SYNC_REFRESH_AND_PERSIST<<SLAP_CONTROL_SHIFT)
  99
 100 /* Record of which searches matched at premodify step */
 101 typedef struct syncmatches {
 102         struct syncmatches *sm_next;
 103         syncops *sm_op;
 104 } syncmatches;
 105
 106 /* Session log data */
 107 typedef struct slog_entry {
 108         struct slog_entry *se_next;
 109         struct berval se_uuid;
 110         struct berval se_csn;
 111         int     se_sid;
 112         ber_tag_t       se_tag;
 113 } slog_entry;
 114
 115 typedef struct sessionlog {
 116         struct berval   sl_mincsn;
 117         int             sl_num;
 118         int             sl_size;
 119         slog_entry *sl_head;
 120         slog_entry *sl_tail;
 121         ldap_pvt_thread_mutex_t sl_mutex;
 122 } sessionlog;
 123
 124 /* The main state for this overlay */
 125 typedef struct syncprov_info_t {
 126         syncops         *si_ops;
 127         BerVarray       si_ctxcsn;      /* ldapsync context */
 128         struct berval   si_contextdn;
 129         int             *si_sids;
 130         int             si_numcsns;
 131         int             si_chkops;      /* checkpointing info */
 132         int             si_chktime;
 133         int             si_numops;      /* number of ops since last checkpoint */
 134         int             si_nopres;      /* Skip present phase */
 135         int             si_usehint;     /* use reload hint */
 136         int             si_active;      /* True if there are active mods */
 137         int             si_dirty;       /* True if the context is dirty, i.e changes
 138                                                  * have been made without updating the csn. */
 139         time_t  si_chklast;     /* time of last checkpoint */
 140         Avlnode *si_mods;       /* entries being modified */
 141         sessionlog      *si_logs;
 142         ldap_pvt_thread_rdwr_t  si_csn_rwlock;
 143         ldap_pvt_thread_mutex_t si_ops_mutex;
 144         ldap_pvt_thread_mutex_t si_mods_mutex;
 145         ldap_pvt_thread_mutex_t si_resp_mutex;
 146 } syncprov_info_t;
 147
 148 typedef struct opcookie {
 149         slap_overinst *son;
 150         syncmatches *smatches;
 151         modtarget *smt;
 152         Entry *se;
 153         struct berval sdn;      /* DN of entry, for deletes */
 154         struct berval sndn;
 155         struct berval suuid;    /* UUID of entry */
 156         struct berval sctxcsn;
 157         short osid;     /* sid of op csn */
 158         short rsid;     /* sid of relay */
 159         short sreference;       /* Is the entry a reference? */
 160 } opcookie;
 161
 162 typedef struct mutexint {
 163         ldap_pvt_thread_mutex_t mi_mutex;
 164         int mi_int;
 165 } mutexint;
 166
 167 typedef struct fbase_cookie {
 168         struct berval *fdn;     /* DN of a modified entry, for scope testing */
 169         syncops *fss;   /* persistent search we're testing against */
 170         int fbase;      /* if TRUE we found the search base and it's still valid */
 171         int fscope;     /* if TRUE then fdn is within the psearch scope */
 172 } fbase_cookie;
 173
 174 static AttributeName csn_anlist[3];
 175 static AttributeName uuid_anlist[2];
 176
 177 /* Build a LDAPsync intermediate state control */
 178 static int
 179 syncprov_state_ctrl(
 180         Operation       *op,
 181         SlapReply       *rs,
 182         Entry           *e,
 183         int             entry_sync_state,
 184         LDAPControl     **ctrls,
 185         int             num_ctrls,
 186         int             send_cookie,
 187         struct berval   *cookie )
 188 {
 189         Attribute* a;
 190         int ret;
 191
 192         BerElementBuffer berbuf;
 193         BerElement *ber = (BerElement *)&berbuf;
 194
 195         struct berval   entryuuid_bv = BER_BVNULL;
 196
 197         ber_init2( ber, 0, LBER_USE_DER );
 198         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 199
 200         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 201
 202         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 203                 AttributeDescription *desc = a->a_desc;
 204                 if ( desc == slap_schema.si_ad_entryUUID ) {
 205                         entryuuid_bv = a->a_nvals[0];
 206                         break;
 207                 }
 208         }
 209
 210         /* FIXME: what if entryuuid is NULL or empty ? */
 211
 212         if ( send_cookie && cookie ) {
 213                 ber_printf( ber, "{eOON}",
 214                         entry_sync_state, &entryuuid_bv, cookie );
 215         } else {
 216                 ber_printf( ber, "{eON}",
 217                         entry_sync_state, &entryuuid_bv );
 218         }
 219
 220         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 221         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 222         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 223
 224         ber_free_buf( ber );
 225
 226         if ( ret < 0 ) {
 227                 Debug( LDAP_DEBUG_TRACE,
 228                         "slap_build_sync_ctrl: ber_flatten2 failed\n",
 229                         0, 0, 0 );
 230                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 231                 return ret;
 232         }
 233
 234         return LDAP_SUCCESS;
 235 }
 236
 237 /* Build a LDAPsync final state control */
 238 static int
 239 syncprov_done_ctrl(
 240         Operation       *op,
 241         SlapReply       *rs,
 242         LDAPControl     **ctrls,
 243         int                     num_ctrls,
 244         int                     send_cookie,
 245         struct berval *cookie,
 246         int                     refreshDeletes )
 247 {
 248         int ret;
 249         BerElementBuffer berbuf;
 250         BerElement *ber = (BerElement *)&berbuf;
 251
 252         ber_init2( ber, NULL, LBER_USE_DER );
 253         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 254
 255         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 256
 257         ber_printf( ber, "{" );
 258         if ( send_cookie && cookie ) {
 259                 ber_printf( ber, "O", cookie );
 260         }
 261         if ( refreshDeletes == LDAP_SYNC_REFRESH_DELETES ) {
 262                 ber_printf( ber, "b", refreshDeletes );
 263         }
 264         ber_printf( ber, "N}" );
 265
 266         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_DONE;
 267         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 268         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 269
 270         ber_free_buf( ber );
 271
 272         if ( ret < 0 ) {
 273                 Debug( LDAP_DEBUG_TRACE,
 274                         "syncprov_done_ctrl: ber_flatten2 failed\n",
 275                         0, 0, 0 );
 276                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 277                 return ret;
 278         }
 279
 280         return LDAP_SUCCESS;
 281 }
 282
 283 static int
 284 syncprov_sendinfo(
 285         Operation       *op,
 286         SlapReply       *rs,
 287         int                     type,
 288         struct berval *cookie,
 289         int                     refreshDone,
 290         BerVarray       syncUUIDs,
 291         int                     refreshDeletes )
 292 {
 293         BerElementBuffer berbuf;
 294         BerElement *ber = (BerElement *)&berbuf;
 295         struct berval rspdata;
 296
 297         int ret;
 298
 299         ber_init2( ber, NULL, LBER_USE_DER );
 300         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 301
 302         if ( type ) {
 303                 switch ( type ) {
 304                 case LDAP_TAG_SYNC_NEW_COOKIE:
 305                         ber_printf( ber, "tO", type, cookie );
 306                         break;
 307                 case LDAP_TAG_SYNC_REFRESH_DELETE:
 308                 case LDAP_TAG_SYNC_REFRESH_PRESENT:
 309                         ber_printf( ber, "t{", type );
 310                         if ( cookie ) {
 311                                 ber_printf( ber, "O", cookie );
 312                         }
 313                         if ( refreshDone == 0 ) {
 314                                 ber_printf( ber, "b", refreshDone );
 315                         }
 316                         ber_printf( ber, "N}" );
 317                         break;
 318                 case LDAP_TAG_SYNC_ID_SET:
 319                         ber_printf( ber, "t{", type );
 320                         if ( cookie ) {
 321                                 ber_printf( ber, "O", cookie );
 322                         }
 323                         if ( refreshDeletes == 1 ) {
 324                                 ber_printf( ber, "b", refreshDeletes );
 325                         }
 326                         ber_printf( ber, "[W]", syncUUIDs );
 327                         ber_printf( ber, "N}" );
 328                         break;
 329                 default:
 330                         Debug( LDAP_DEBUG_TRACE,
 331                                 "syncprov_sendinfo: invalid syncinfo type (%d)\n",
 332                                 type, 0, 0 );
 333                         return LDAP_OTHER;
 334                 }
 335         }
 336
 337         ret = ber_flatten2( ber, &rspdata, 0 );
 338
 339         if ( ret < 0 ) {
 340                 Debug( LDAP_DEBUG_TRACE,
 341                         "syncprov_sendinfo: ber_flatten2 failed\n",
 342                         0, 0, 0 );
 343                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 344                 return ret;
 345         }
 346
 347         rs->sr_rspoid = LDAP_SYNC_INFO;
 348         rs->sr_rspdata = &rspdata;
 349         send_ldap_intermediate( op, rs );
 350         rs->sr_rspdata = NULL;
 351         ber_free_buf( ber );
 352
 353         return LDAP_SUCCESS;
 354 }
 355
 356 /* Find a modtarget in an AVL tree */
 357 static int
 358 sp_avl_cmp( const void *c1, const void *c2 )
 359 {
 360         const modtarget *m1, *m2;
 361         int rc;
 362
 363         m1 = c1; m2 = c2;
 364         rc = m1->mt_op->o_req_ndn.bv_len - m2->mt_op->o_req_ndn.bv_len;
 365
 366         if ( rc ) return rc;
 367         return ber_bvcmp( &m1->mt_op->o_req_ndn, &m2->mt_op->o_req_ndn );
 368 }
 369
 370 /* syncprov_findbase:
 371  *   finds the true DN of the base of a search (with alias dereferencing) and
 372  * checks to make sure the base entry doesn't get replaced with a different
 373  * entry (e.g., swapping trees via ModDN, or retargeting an alias). If a
 374  * change is detected, any persistent search on this base must be terminated /
 375  * reloaded.
 376  *   On the first call, we just save the DN and entryID. On subsequent calls
 377  * we compare the DN and entryID with the saved values.
 378  */
 379 static int
 380 findbase_cb( Operation *op, SlapReply *rs )
 381 {
 382         slap_callback *sc = op->o_callback;
 383
 384         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 385                 fbase_cookie *fc = sc->sc_private;
 386
 387                 /* If no entryID, we're looking for the first time.
 388                  * Just store whatever we got.
 389                  */
 390                 if ( fc->fss->s_eid == NOID ) {
 391                         fc->fbase = 2;
 392                         fc->fss->s_eid = rs->sr_entry->e_id;
 393                         ber_dupbv( &fc->fss->s_base, &rs->sr_entry->e_nname );
 394
 395                 } else if ( rs->sr_entry->e_id == fc->fss->s_eid &&
 396                         dn_match( &rs->sr_entry->e_nname, &fc->fss->s_base )) {
 397
 398                 /* OK, the DN is the same and the entryID is the same. */
 399                         fc->fbase = 1;
 400                 }
 401         }
 402         if ( rs->sr_err != LDAP_SUCCESS ) {
 403                 Debug( LDAP_DEBUG_ANY, "findbase failed! %d\n", rs->sr_err,0,0 );
 404         }
 405         return LDAP_SUCCESS;
 406 }
 407
 408 static Filter generic_filter = { LDAP_FILTER_PRESENT, { 0 }, NULL };
 409 static struct berval generic_filterstr = BER_BVC("(objectclass=*)");
 410
 411 static int
 412 syncprov_findbase( Operation *op, fbase_cookie *fc )
 413 {
 414         /* Use basic parameters from syncrepl search, but use
 415          * current op's threadctx / tmpmemctx
 416          */
 417         ldap_pvt_thread_mutex_lock( &fc->fss->s_mutex );
 418         if ( fc->fss->s_flags & PS_FIND_BASE ) {
 419                 slap_callback cb = {0};
 420                 Operation fop;
 421                 SlapReply frs = { REP_RESULT };
 422                 int rc;
 423
 424                 fc->fss->s_flags ^= PS_FIND_BASE;
 425                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 426
 427                 fop = *fc->fss->s_op;
 428
 429                 fop.o_bd = fop.o_bd->bd_self;
 430                 fop.o_hdr = op->o_hdr;
 431                 fop.o_time = op->o_time;
 432                 fop.o_tincr = op->o_tincr;
 433
 434                 cb.sc_response = findbase_cb;
 435                 cb.sc_private = fc;
 436
 437                 fop.o_sync_mode = 0;    /* turn off sync mode */
 438                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 439                 fop.o_callback = &cb;
 440                 fop.o_tag = LDAP_REQ_SEARCH;
 441                 fop.ors_scope = LDAP_SCOPE_BASE;
 442                 fop.ors_limit = NULL;
 443                 fop.ors_slimit = 1;
 444                 fop.ors_tlimit = SLAP_NO_LIMIT;
 445                 fop.ors_attrs = slap_anlist_no_attrs;
 446                 fop.ors_attrsonly = 1;
 447                 fop.ors_filter = &generic_filter;
 448                 fop.ors_filterstr = generic_filterstr;
 449
 450                 rc = fop.o_bd->be_search( &fop, &frs );
 451         } else {
 452                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 453                 fc->fbase = 1;
 454         }
 455
 456         /* After the first call, see if the fdn resides in the scope */
 457         if ( fc->fbase == 1 ) {
 458                 switch ( fc->fss->s_op->ors_scope ) {
 459                 case LDAP_SCOPE_BASE:
 460                         fc->fscope = dn_match( fc->fdn, &fc->fss->s_base );
 461                         break;
 462                 case LDAP_SCOPE_ONELEVEL: {
 463                         struct berval pdn;
 464                         dnParent( fc->fdn, &pdn );
 465                         fc->fscope = dn_match( &pdn, &fc->fss->s_base );
 466                         break; }
 467                 case LDAP_SCOPE_SUBTREE:
 468                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base );
 469                         break;
 470                 case LDAP_SCOPE_SUBORDINATE:
 471                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base ) &&
 472                                 !dn_match( fc->fdn, &fc->fss->s_base );
 473                         break;
 474                 }
 475         }
 476
 477         if ( fc->fbase )
 478                 return LDAP_SUCCESS;
 479
 480         /* If entryID has changed, then the base of this search has
 481          * changed. Invalidate the psearch.
 482          */
 483         return LDAP_NO_SUCH_OBJECT;
 484 }
 485
 486 /* syncprov_findcsn:
 487  *   This function has three different purposes, but they all use a search
 488  * that filters on entryCSN so they're combined here.
 489  * 1: at startup time, after a contextCSN has been read from the database,
 490  * we search for all entries with CSN >= contextCSN in case the contextCSN
 491  * was not checkpointed at the previous shutdown.
 492  *
 493  * 2: when the current contextCSN is known and we have a sync cookie, we search
 494  * for one entry with CSN = the cookie CSN. If not found, try <= cookie CSN.
 495  * If an entry is found, the cookie CSN is valid, otherwise it is stale.
 496  *
 497  * 3: during a refresh phase, we search for all entries with CSN <= the cookie
 498  * CSN, and generate Present records for them. We always collect this result
 499  * in SyncID sets, even if there's only one match.
 500  */
 501 typedef enum find_csn_t {
 502         FIND_MAXCSN     = 1,
 503         FIND_CSN        = 2,
 504         FIND_PRESENT    = 3
 505 } find_csn_t;
 506
 507 static int
 508 findmax_cb( Operation *op, SlapReply *rs )
 509 {
 510         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 511                 struct berval *maxcsn = op->o_callback->sc_private;
 512                 Attribute *a = attr_find( rs->sr_entry->e_attrs,
 513                         slap_schema.si_ad_entryCSN );
 514
 515                 if ( a && ber_bvcmp( &a->a_vals[0], maxcsn ) > 0 &&
 516                         slap_parse_csn_sid( &a->a_vals[0] ) == slap_serverID ) {
 517                         maxcsn->bv_len = a->a_vals[0].bv_len;
 518                         strcpy( maxcsn->bv_val, a->a_vals[0].bv_val );
 519                 }
 520         }
 521         return LDAP_SUCCESS;
 522 }
 523
 524 static int
 525 findcsn_cb( Operation *op, SlapReply *rs )
 526 {
 527         slap_callback *sc = op->o_callback;
 528
 529         /* We just want to know that at least one exists, so it's OK if
 530          * we exceed the unchecked limit.
 531          */
 532         if ( rs->sr_err == LDAP_ADMINLIMIT_EXCEEDED ||
 533                 (rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS )) {
 534                 sc->sc_private = (void *)1;
 535         }
 536         return LDAP_SUCCESS;
 537 }
 538
 539 /* Build a list of entryUUIDs for sending in a SyncID set */
 540
 541 #define UUID_LEN        16
 542
 543 typedef struct fpres_cookie {
 544         int num;
 545         BerVarray uuids;
 546         char *last;
 547 } fpres_cookie;
 548
 549 static int
 550 findpres_cb( Operation *op, SlapReply *rs )
 551 {
 552         slap_callback *sc = op->o_callback;
 553         fpres_cookie *pc = sc->sc_private;
 554         Attribute *a;
 555         int ret = SLAP_CB_CONTINUE;
 556
 557         switch ( rs->sr_type ) {
 558         case REP_SEARCH:
 559                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryUUID );
 560                 if ( a ) {
 561                         pc->uuids[pc->num].bv_val = pc->last;
 562                         AC_MEMCPY( pc->uuids[pc->num].bv_val, a->a_nvals[0].bv_val,
 563                                 pc->uuids[pc->num].bv_len );
 564                         pc->num++;
 565                         pc->last = pc->uuids[pc->num].bv_val;
 566                         pc->uuids[pc->num].bv_val = NULL;
 567                 }
 568                 ret = LDAP_SUCCESS;
 569                 if ( pc->num != SLAP_SYNCUUID_SET_SIZE )
 570                         break;
 571                 /* FALLTHRU */
 572         case REP_RESULT:
 573                 ret = rs->sr_err;
 574                 if ( pc->num ) {
 575                         ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 576                                 0, pc->uuids, 0 );
 577                         pc->uuids[pc->num].bv_val = pc->last;
 578                         pc->num = 0;
 579                         pc->last = pc->uuids[0].bv_val;
 580                 }
 581                 break;
 582         default:
 583                 break;
 584         }
 585         return ret;
 586 }
 587
 588 static int
 589 syncprov_findcsn( Operation *op, find_csn_t mode )
 590 {
 591         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 592         syncprov_info_t         *si = on->on_bi.bi_private;
 593
 594         slap_callback cb = {0};
 595         Operation fop;
 596         SlapReply frs = { REP_RESULT };
 597         char buf[LDAP_PVT_CSNSTR_BUFSIZE + STRLENOF("(entryCSN<=)")];
 598         char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
 599         struct berval maxcsn;
 600         Filter cf;
 601         AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
 602         fpres_cookie pcookie;
 603         sync_control *srs = NULL;
 604         struct slap_limits_set fc_limits;
 605         int i, rc = LDAP_SUCCESS, findcsn_retry = 1;
 606         int maxid;
 607
 608         if ( mode != FIND_MAXCSN ) {
 609                 srs = op->o_controls[slap_cids.sc_LDAPsync];
 610         }
 611
 612         fop = *op;
 613         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync_mode */
 614         /* We want pure entries, not referrals */
 615         fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 616
 617         cf.f_ava = &eq;
 618         cf.f_av_desc = slap_schema.si_ad_entryCSN;
 619         BER_BVZERO( &cf.f_av_value );
 620         cf.f_next = NULL;
 621
 622         fop.o_callback = &cb;
 623         fop.ors_limit = NULL;
 624         fop.ors_tlimit = SLAP_NO_LIMIT;
 625         fop.ors_filter = &cf;
 626         fop.ors_filterstr.bv_val = buf;
 627
 628 again:
 629         switch( mode ) {
 630         case FIND_MAXCSN:
 631                 cf.f_choice = LDAP_FILTER_GE;
 632                 /* If there are multiple CSNs, use the one with our serverID */
 633                 for ( i=0; i<si->si_numcsns; i++) {
 634                         if ( slap_serverID == si->si_sids[i] ) {
 635                                 maxid = i;
 636                                 break;
 637                         }
 638                 }
 639                 if ( i == si->si_numcsns ) {
 640                         /* No match: this is multimaster, and none of the content in the DB
 641                          * originated locally. Treat like no CSN.
 642                          */
 643                         return LDAP_NO_SUCH_OBJECT;
 644                 }
 645                 cf.f_av_value = si->si_ctxcsn[maxid];
 646                 fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 647                         "(entryCSN>=%s)", cf.f_av_value.bv_val );
 648                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 649                         return LDAP_OTHER;
 650                 }
 651                 fop.ors_attrsonly = 0;
 652                 fop.ors_attrs = csn_anlist;
 653                 fop.ors_slimit = SLAP_NO_LIMIT;
 654                 cb.sc_private = &maxcsn;
 655                 cb.sc_response = findmax_cb;
 656                 strcpy( cbuf, cf.f_av_value.bv_val );
 657                 maxcsn.bv_val = cbuf;
 658                 maxcsn.bv_len = cf.f_av_value.bv_len;
 659                 break;
 660         case FIND_CSN:
 661                 if ( BER_BVISEMPTY( &cf.f_av_value )) {
 662                         cf.f_av_value = srs->sr_state.ctxcsn[0];
 663                         /* If there are multiple CSNs, use the smallest */
 664                         for ( i=1; i<srs->sr_state.numcsns; i++ ) {
 665                                 if ( ber_bvcmp( &cf.f_av_value, &srs->sr_state.ctxcsn[i] )
 666                                         > 0 ) {
 667                                         cf.f_av_value = srs->sr_state.ctxcsn[i];
 668                                 }
 669                         }
 670                 }
 671                 /* Look for exact match the first time */
 672                 if ( findcsn_retry ) {
 673                         cf.f_choice = LDAP_FILTER_EQUALITY;
 674                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 675                                 "(entryCSN=%s)", cf.f_av_value.bv_val );
 676                 /* On retry, look for <= */
 677                 } else {
 678                         cf.f_choice = LDAP_FILTER_LE;
 679                         fop.ors_limit = &fc_limits;
 680                         memset( &fc_limits, 0, sizeof( fc_limits ));
 681                         fc_limits.lms_s_unchecked = 1;
 682                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 683                                 "(entryCSN<=%s)", cf.f_av_value.bv_val );
 684                 }
 685                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 686                         return LDAP_OTHER;
 687                 }
 688                 fop.ors_attrsonly = 1;
 689                 fop.ors_attrs = slap_anlist_no_attrs;
 690                 fop.ors_slimit = 1;
 691                 cb.sc_private = NULL;
 692                 cb.sc_response = findcsn_cb;
 693                 break;
 694         case FIND_PRESENT:
 695                 fop.ors_filter = op->ors_filter;
 696                 fop.ors_filterstr = op->ors_filterstr;
 697                 fop.ors_attrsonly = 0;
 698                 fop.ors_attrs = uuid_anlist;
 699                 fop.ors_slimit = SLAP_NO_LIMIT;
 700                 cb.sc_private = &pcookie;
 701                 cb.sc_response = findpres_cb;
 702                 pcookie.num = 0;
 703
 704                 /* preallocate storage for a full set */
 705                 pcookie.uuids = op->o_tmpalloc( (SLAP_SYNCUUID_SET_SIZE+1) *
 706                         sizeof(struct berval) + SLAP_SYNCUUID_SET_SIZE * UUID_LEN,
 707                         op->o_tmpmemctx );
 708                 pcookie.last = (char *)(pcookie.uuids + SLAP_SYNCUUID_SET_SIZE+1);
 709                 pcookie.uuids[0].bv_val = pcookie.last;
 710                 pcookie.uuids[0].bv_len = UUID_LEN;
 711                 for (i=1; i<SLAP_SYNCUUID_SET_SIZE; i++) {
 712                         pcookie.uuids[i].bv_val = pcookie.uuids[i-1].bv_val + UUID_LEN;
 713                         pcookie.uuids[i].bv_len = UUID_LEN;
 714                 }
 715                 break;
 716         }
 717
 718         fop.o_bd->bd_info = (BackendInfo *)on->on_info;
 719         fop.o_bd->be_search( &fop, &frs );
 720         fop.o_bd->bd_info = (BackendInfo *)on;
 721
 722         switch( mode ) {
 723         case FIND_MAXCSN:
 724                 if ( ber_bvcmp( &si->si_ctxcsn[maxid], &maxcsn )) {
 725 #ifdef CHECK_CSN
 726                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
 727                         assert( !syn->ssyn_validate( syn, &maxcsn ));
 728 #endif
 729                         ber_bvreplace( &si->si_ctxcsn[maxid], &maxcsn );
 730                         si->si_numops++;        /* ensure a checkpoint */
 731                 }
 732                 break;
 733         case FIND_CSN:
 734                 /* If matching CSN was not found, invalidate the context. */
 735                 if ( !cb.sc_private ) {
 736                         /* If we didn't find an exact match, then try for <= */
 737                         if ( findcsn_retry ) {
 738                                 findcsn_retry = 0;
 739                                 goto again;
 740                         }
 741                         rc = LDAP_NO_SUCH_OBJECT;
 742                 }
 743                 break;
 744         case FIND_PRESENT:
 745                 op->o_tmpfree( pcookie.uuids, op->o_tmpmemctx );
 746                 break;
 747         }
 748
 749         return rc;
 750 }
 751
 752 /* Should find a place to cache these */
 753 static mutexint *get_mutexint()
 754 {
 755         mutexint *mi = ch_malloc( sizeof( mutexint ));
 756         ldap_pvt_thread_mutex_init( &mi->mi_mutex );
 757         mi->mi_int = 1;
 758         return mi;
 759 }
 760
 761 static void inc_mutexint( mutexint *mi )
 762 {
 763         ldap_pvt_thread_mutex_lock( &mi->mi_mutex );
 764         mi->mi_int++;
 765         ldap_pvt_thread_mutex_unlock( &mi->mi_mutex );
 766 }
 767
 768 /* return resulting counter */
 769 static int dec_mutexint( mutexint *mi )
 770 {
 771         int i;
 772         ldap_pvt_thread_mutex_lock( &mi->mi_mutex );
 773         i = --mi->mi_int;
 774         ldap_pvt_thread_mutex_unlock( &mi->mi_mutex );
 775         if ( !i ) {
 776                 ldap_pvt_thread_mutex_destroy( &mi->mi_mutex );
 777                 ch_free( mi );
 778         }
 779         return i;
 780 }
 781
 782 static void
 783 syncprov_free_syncop( syncops *so )
 784 {
 785         syncres *sr, *srnext;
 786         GroupAssertion *ga, *gnext;
 787
 788         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 789         if ( --so->s_inuse > 0 ) {
 790                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 791                 return;
 792         }
 793         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 794         if ( so->s_flags & PS_IS_DETACHED ) {
 795                 filter_free( so->s_op->ors_filter );
 796                 for ( ga = so->s_op->o_groups; ga; ga=gnext ) {
 797                         gnext = ga->ga_next;
 798                         ch_free( ga );
 799                 }
 800                 ch_free( so->s_op );
 801         }
 802         ch_free( so->s_base.bv_val );
 803         for ( sr=so->s_res; sr; sr=srnext ) {
 804                 srnext = sr->s_next;
 805                 if ( sr->s_e ) {
 806                         if ( !dec_mutexint( sr->s_e->e_private )) {
 807                                 sr->s_e->e_private = NULL;
 808                                 entry_free( sr->s_e );
 809                         }
 810                 }
 811                 ch_free( sr );
 812         }
 813         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 814         ch_free( so );
 815 }
 816
 817 /* Send a persistent search response */
 818 static int
 819 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so, int mode )
 820 {
 821         slap_overinst *on = opc->son;
 822
 823         SlapReply rs = { REP_SEARCH };
 824         LDAPControl *ctrls[2];
 825         struct berval cookie = BER_BVNULL, csns[2];
 826         Entry e_uuid = {0};
 827         Attribute a_uuid = {0};
 828
 829         if ( so->s_op->o_abandon )
 830                 return SLAPD_ABANDON;
 831
 832         ctrls[1] = NULL;
 833         if ( !BER_BVISNULL( &opc->sctxcsn )) {
 834                 csns[0] = opc->sctxcsn;
 835                 BER_BVZERO( &csns[1] );
 836                 slap_compose_sync_cookie( op, &cookie, csns, so->s_rid, slap_serverID ? slap_serverID : -1 );
 837         }
 838
 839 #ifdef LDAP_DEBUG
 840         if ( so->s_sid > 0 ) {
 841                 Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: to=%03x, cookie=%s\n",
 842                         so->s_sid, cookie.bv_val ? cookie.bv_val : "", 0 );
 843         } else {
 844                 Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: cookie=%s\n",
 845                         cookie.bv_val ? cookie.bv_val : "", 0, 0 );
 846         }
 847 #endif
 848
 849         e_uuid.e_attrs = &a_uuid;
 850         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 851         a_uuid.a_nvals = &opc->suuid;
 852         rs.sr_err = syncprov_state_ctrl( op, &rs, &e_uuid,
 853                 mode, ctrls, 0, 1, &cookie );
 854         if ( !BER_BVISNULL( &cookie )) {
 855                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
 856         }
 857
 858         rs.sr_ctrls = ctrls;
 859         rs.sr_entry = &e_uuid;
 860         if ( mode == LDAP_SYNC_ADD || mode == LDAP_SYNC_MODIFY ) {
 861                 e_uuid = *opc->se;
 862                 e_uuid.e_private = NULL;
 863         }
 864
 865         switch( mode ) {
 866         case LDAP_SYNC_ADD:
 867                 if ( opc->sreference && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 868                         rs.sr_ref = get_entry_referrals( op, rs.sr_entry );
 869                         rs.sr_err = send_search_reference( op, &rs );
 870                         ber_bvarray_free( rs.sr_ref );
 871                         break;
 872                 }
 873                 /* fallthru */
 874         case LDAP_SYNC_MODIFY:
 875                 rs.sr_attrs = op->ors_attrs;
 876                 rs.sr_err = send_search_entry( op, &rs );
 877                 break;
 878         case LDAP_SYNC_DELETE:
 879                 e_uuid.e_attrs = NULL;
 880                 e_uuid.e_name = opc->sdn;
 881                 e_uuid.e_nname = opc->sndn;
 882                 if ( opc->sreference && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 883                         struct berval bv = BER_BVNULL;
 884                         rs.sr_ref = &bv;
 885                         rs.sr_err = send_search_reference( op, &rs );
 886                 } else {
 887                         rs.sr_err = send_search_entry( op, &rs );
 888                 }
 889                 break;
 890         default:
 891                 assert(0);
 892         }
 893         /* In case someone else freed it already? */
 894         if ( rs.sr_ctrls ) {
 895                 int i;
 896                 for ( i=0; rs.sr_ctrls[i]; i++ ) {
 897                         if ( rs.sr_ctrls[i] == ctrls[0] ) {
 898                                 op->o_tmpfree( ctrls[0]->ldctl_value.bv_val, op->o_tmpmemctx );
 899                                 ctrls[0]->ldctl_value.bv_val = NULL;
 900                                 break;
 901                         }
 902                 }
 903                 rs.sr_ctrls = NULL;
 904         }
 905
 906         return rs.sr_err;
 907 }
 908
 909 static void
 910 syncprov_qstart( syncops *so );
 911
 912 /* Play back queued responses */
 913 static int
 914 syncprov_qplay( Operation *op, syncops *so )
 915 {
 916         slap_overinst *on = LDAP_SLIST_FIRST(&so->s_op->o_extra)->oe_key;
 917         syncres *sr;
 918         Entry *e;
 919         opcookie opc;
 920         int rc = 0;
 921
 922         opc.son = on;
 923
 924         do {
 925                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 926                 sr = so->s_res;
 927                 if ( sr )
 928                         so->s_res = sr->s_next;
 929                 if ( !so->s_res )
 930                         so->s_restail = NULL;
 931                 /* Exit loop with mutex held */
 932                 if ( !sr || so->s_op->o_abandon )
 933                         break;
 934                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 935
 936                 if ( sr->s_mode == LDAP_SYNC_NEW_COOKIE ) {
 937                         SlapReply rs = { REP_INTERMEDIATE };
 938
 939                         rc = syncprov_sendinfo( op, &rs, LDAP_TAG_SYNC_NEW_COOKIE,
 940                                 &sr->s_csn, 0, NULL, 0 );
 941                 } else {
 942                         opc.sdn = sr->s_dn;
 943                         opc.sndn = sr->s_ndn;
 944                         opc.suuid = sr->s_uuid;
 945                         opc.sctxcsn = sr->s_csn;
 946                         opc.sreference = sr->s_isreference;
 947                         opc.se = sr->s_e;
 948
 949                         rc = syncprov_sendresp( op, &opc, so, sr->s_mode );
 950
 951                 }
 952                 if ( sr->s_e ) {
 953                         if ( !dec_mutexint( sr->s_e->e_private )) {
 954                                 sr->s_e->e_private = NULL;
 955                                 entry_free ( sr->s_e );
 956                         }
 957                 }
 958
 959                 ch_free( sr );
 960
 961                 /* Exit loop with mutex held */
 962                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 963
 964         } while (0);
 965
 966         /* We now only send one change at a time, to prevent one
 967          * psearch from hogging all the CPU. Resubmit this task if
 968          * there are more responses queued and no errors occurred.
 969          */
 970
 971         if ( rc == 0 && so->s_res ) {
 972                 syncprov_qstart( so );
 973         } else {
 974                 so->s_flags ^= PS_TASK_QUEUED;
 975         }
 976
 977         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 978         return rc;
 979 }
 980
 981 /* task for playing back queued responses */
 982 static void *
 983 syncprov_qtask( void *ctx, void *arg )
 984 {
 985         syncops *so = arg;
 986         OperationBuffer opbuf;
 987         Operation *op;
 988         BackendDB be;
 989         int rc;
 990
 991         op = &opbuf.ob_op;
 992         *op = *so->s_op;
 993         op->o_hdr = &opbuf.ob_hdr;
 994         op->o_controls = opbuf.ob_controls;
 995         memset( op->o_controls, 0, sizeof(opbuf.ob_controls) );
 996
 997         *op->o_hdr = *so->s_op->o_hdr;
 998
 999         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx, 1);
1000         op->o_tmpmfuncs = &slap_sl_mfuncs;
1001         op->o_threadctx = ctx;
1002
1003         /* syncprov_qplay expects a fake db */
1004         be = *so->s_op->o_bd;
1005         be.be_flags |= SLAP_DBFLAG_OVERLAY;
1006         op->o_bd = &be;
1007         LDAP_SLIST_FIRST(&op->o_extra) = NULL;
1008         op->o_callback = NULL;
1009
1010         rc = syncprov_qplay( op, so );
1011
1012         /* decrement use count... */
1013         syncprov_free_syncop( so );
1014
1015         return NULL;
1016 }
1017
1018 /* Start the task to play back queued psearch responses */
1019 static void
1020 syncprov_qstart( syncops *so )
1021 {
1022         so->s_flags |= PS_TASK_QUEUED;
1023         so->s_inuse++;
1024         ldap_pvt_thread_pool_submit( &connection_pool,
1025                 syncprov_qtask, so );
1026 }
1027
1028 /* Queue a persistent search response */
1029 static int
1030 syncprov_qresp( opcookie *opc, syncops *so, int mode )
1031 {
1032         syncres *sr;
1033         int srsize;
1034         struct berval cookie = opc->sctxcsn;
1035
1036         if ( mode == LDAP_SYNC_NEW_COOKIE ) {
1037                 syncprov_info_t *si = opc->son->on_bi.bi_private;
1038
1039                 slap_compose_sync_cookie( NULL, &cookie, si->si_ctxcsn,
1040                         so->s_rid, slap_serverID ? slap_serverID : -1);
1041         }
1042
1043         srsize = sizeof(syncres) + opc->suuid.bv_len + 1 +
1044                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1;
1045         if ( cookie.bv_len )
1046                 srsize += cookie.bv_len + 1;
1047         sr = ch_malloc( srsize );
1048         sr->s_next = NULL;
1049         sr->s_e = opc->se;
1050         /* bump refcount on this entry */
1051         if ( opc->se )
1052                 inc_mutexint( opc->se->e_private );
1053         sr->s_dn.bv_val = (char *)(sr + 1);
1054         sr->s_dn.bv_len = opc->sdn.bv_len;
1055         sr->s_mode = mode;
1056         sr->s_isreference = opc->sreference;
1057         sr->s_ndn.bv_val = lutil_strcopy( sr->s_dn.bv_val,
1058                  opc->sdn.bv_val ) + 1;
1059         sr->s_ndn.bv_len = opc->sndn.bv_len;
1060         sr->s_uuid.bv_val = lutil_strcopy( sr->s_ndn.bv_val,
1061                  opc->sndn.bv_val ) + 1;
1062         sr->s_uuid.bv_len = opc->suuid.bv_len;
1063         AC_MEMCPY( sr->s_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1064         if ( cookie.bv_len ) {
1065                 sr->s_csn.bv_val = sr->s_uuid.bv_val + sr->s_uuid.bv_len + 1;
1066                 strcpy( sr->s_csn.bv_val, cookie.bv_val );
1067         } else {
1068                 sr->s_csn.bv_val = NULL;
1069         }
1070         sr->s_csn.bv_len = cookie.bv_len;
1071
1072         if ( mode == LDAP_SYNC_NEW_COOKIE && cookie.bv_val ) {
1073                 ch_free( cookie.bv_val );
1074         }
1075
1076         ldap_pvt_thread_mutex_lock( &so->s_mutex );
1077         if ( !so->s_res ) {
1078                 so->s_res = sr;
1079         } else {
1080                 so->s_restail->s_next = sr;
1081         }
1082         so->s_restail = sr;
1083
1084         /* If the base of the psearch was modified, check it next time round */
1085         if ( so->s_flags & PS_WROTE_BASE ) {
1086                 so->s_flags ^= PS_WROTE_BASE;
1087                 so->s_flags |= PS_FIND_BASE;
1088         }
1089         if (( so->s_flags & (PS_IS_DETACHED|PS_TASK_QUEUED)) == PS_IS_DETACHED ) {
1090                 syncprov_qstart( so );
1091         }
1092         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
1093         return LDAP_SUCCESS;
1094 }
1095
1096 static int
1097 syncprov_drop_psearch( syncops *so, int lock )
1098 {
1099         if ( so->s_flags & PS_IS_DETACHED ) {
1100                 if ( lock )
1101                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
1102                 so->s_op->o_conn->c_n_ops_executing--;
1103                 so->s_op->o_conn->c_n_ops_completed++;
1104                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, Operation,
1105                         o_next );
1106                 if ( lock )
1107                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
1108         }
1109         syncprov_free_syncop( so );
1110
1111         return 0;
1112 }
1113
1114 static int
1115 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
1116 {
1117         slap_callback *sc = op->o_callback;
1118         op->o_callback = sc->sc_next;
1119         syncprov_drop_psearch( op->o_callback->sc_private, 0 );
1120         op->o_tmpfree( sc, op->o_tmpmemctx );
1121         return 0;
1122 }
1123
1124 static int
1125 syncprov_op_abandon( Operation *op, SlapReply *rs )
1126 {
1127         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1128         syncprov_info_t         *si = on->on_bi.bi_private;
1129         syncops *so, *soprev;
1130
1131         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1132         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
1133                 soprev=so, so=so->s_next ) {
1134                 if ( so->s_op->o_connid == op->o_connid &&
1135                         so->s_op->o_msgid == op->orn_msgid ) {
1136                                 so->s_op->o_abandon = 1;
1137                                 soprev->s_next = so->s_next;
1138                                 break;
1139                 }
1140         }
1141         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1142         if ( so ) {
1143                 /* Is this really a Cancel exop? */
1144                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
1145                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
1146                         rs->sr_err = LDAP_CANCELLED;
1147                         send_ldap_result( so->s_op, rs );
1148                         if ( so->s_flags & PS_IS_DETACHED ) {
1149                                 slap_callback *cb;
1150                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
1151                                 cb->sc_cleanup = syncprov_ab_cleanup;
1152                                 cb->sc_next = op->o_callback;
1153                                 cb->sc_private = so;
1154                                 return SLAP_CB_CONTINUE;
1155                         }
1156                 }
1157                 syncprov_drop_psearch( so, 0 );
1158         }
1159         return SLAP_CB_CONTINUE;
1160 }
1161
1162 /* Find which persistent searches are affected by this operation */
1163 static void
1164 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
1165 {
1166         slap_overinst *on = opc->son;
1167         syncprov_info_t         *si = on->on_bi.bi_private;
1168
1169         fbase_cookie fc;
1170         syncops *ss, *sprev, *snext;
1171         Entry *e = NULL;
1172         Attribute *a;
1173         int rc;
1174         struct berval newdn;
1175         int freefdn = 0;
1176         BackendDB *b0 = op->o_bd, db;
1177
1178         fc.fdn = &op->o_req_ndn;
1179         /* compute new DN */
1180         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1181                 struct berval pdn;
1182                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
1183                 else dnParent( fc.fdn, &pdn );
1184                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
1185                 fc.fdn = &newdn;
1186                 freefdn = 1;
1187         }
1188         if ( op->o_tag != LDAP_REQ_ADD ) {
1189                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1190                         db = *op->o_bd;
1191                         op->o_bd = &db;
1192                 }
1193                 rc = overlay_entry_get_ov( op, fc.fdn, NULL, NULL, 0, &e, on );
1194                 /* If we're sending responses now, make a copy and unlock the DB */
1195                 if ( e && !saveit ) {
1196                         if ( !opc->se ) {
1197                                 opc->se = entry_dup( e );
1198                                 opc->se->e_private = get_mutexint();
1199                         }
1200                         overlay_entry_release_ov( op, e, 0, on );
1201                         e = opc->se;
1202                 }
1203                 if ( rc ) {
1204                         op->o_bd = b0;
1205                         return;
1206                 }
1207         } else {
1208                 e = op->ora_e;
1209                 if ( !saveit ) {
1210                         if ( !opc->se ) {
1211                                 opc->se = entry_dup( e );
1212                                 opc->se->e_private = get_mutexint();
1213                         }
1214                         e = opc->se;
1215                 }
1216         }
1217
1218         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1219                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1220                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1221                 opc->sreference = is_entry_referral( e );
1222                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1223                 if ( a )
1224                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1225         } else if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1226                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1227                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1228                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1229                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1230         }
1231
1232         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1233         for (ss = si->si_ops, sprev = (syncops *)&si->si_ops; ss;
1234                 sprev = ss, ss=snext)
1235         {
1236                 Operation op2;
1237                 Opheader oh;
1238                 syncmatches *sm;
1239                 int found = 0;
1240
1241                 snext = ss->s_next;
1242                 if ( ss->s_op->o_abandon )
1243                         continue;
1244
1245                 /* Don't send ops back to the originator */
1246                 if ( opc->osid > 0 && opc->osid == ss->s_sid ) {
1247                         Debug( LDAP_DEBUG_SYNC, "syncprov_matchops: skipping original sid %03x\n",
1248                                 opc->osid, 0, 0 );
1249                         continue;
1250                 }
1251
1252                 /* Don't send ops back to the messenger */
1253                 if ( opc->rsid > 0 && opc->rsid == ss->s_sid ) {
1254                         Debug( LDAP_DEBUG_SYNC, "syncprov_matchops: skipping relayed sid %03x\n",
1255                                 opc->rsid, 0, 0 );
1256                         continue;
1257                 }
1258
1259                 /* validate base */
1260                 fc.fss = ss;
1261                 fc.fbase = 0;
1262                 fc.fscope = 0;
1263
1264                 /* If the base of the search is missing, signal a refresh */
1265                 rc = syncprov_findbase( op, &fc );
1266                 if ( rc != LDAP_SUCCESS ) {
1267                         SlapReply rs = {REP_RESULT};
1268                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1269                                 "search base has changed" );
1270                         sprev->s_next = snext;
1271                         syncprov_drop_psearch( ss, 1 );
1272                         ss = sprev;
1273                         continue;
1274                 }
1275
1276                 /* If we're sending results now, look for this op in old matches */
1277                 if ( !saveit ) {
1278                         syncmatches *old;
1279
1280                         /* Did we modify the search base? */
1281                         if ( dn_match( &op->o_req_ndn, &ss->s_base )) {
1282                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1283                                 ss->s_flags |= PS_WROTE_BASE;
1284                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1285                         }
1286
1287                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1288                                 old=sm, sm=sm->sm_next ) {
1289                                 if ( sm->sm_op == ss ) {
1290                                         found = 1;
1291                                         old->sm_next = sm->sm_next;
1292                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1293                                         break;
1294                                 }
1295                         }
1296                 }
1297
1298                 if ( fc.fscope ) {
1299                         ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1300                         op2 = *ss->s_op;
1301                         oh = *op->o_hdr;
1302                         oh.oh_conn = ss->s_op->o_conn;
1303                         oh.oh_connid = ss->s_op->o_connid;
1304                         op2.o_bd = op->o_bd->bd_self;
1305                         op2.o_hdr = &oh;
1306                         op2.o_extra = op->o_extra;
1307                         op2.o_callback = NULL;
1308                         if (ss->s_flags & PS_FIX_FILTER) {
1309                                 /* Skip the AND/GE clause that we stuck on in front. We
1310                                    would lose deletes/mods that happen during the refresh
1311                                    phase otherwise (ITS#6555) */
1312                                 op2.ors_filter = ss->s_op->ors_filter->f_and->f_next;
1313                         }
1314                         ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1315                         rc = test_filter( &op2, e, op2.ors_filter );
1316                 }
1317
1318                 Debug( LDAP_DEBUG_TRACE, "syncprov_matchops: sid %03x fscope %d rc %d\n",
1319                         ss->s_sid, fc.fscope, rc );
1320
1321                 /* check if current o_req_dn is in scope and matches filter */
1322                 if ( fc.fscope && rc == LDAP_COMPARE_TRUE ) {
1323                         if ( saveit ) {
1324                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1325                                 sm->sm_next = opc->smatches;
1326                                 sm->sm_op = ss;
1327                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1328                                 ++ss->s_inuse;
1329                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1330                                 opc->smatches = sm;
1331                         } else {
1332                                 /* if found send UPDATE else send ADD */
1333                                 syncprov_qresp( opc, ss,
1334                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD );
1335                         }
1336                 } else if ( !saveit && found ) {
1337                         /* send DELETE */
1338                         syncprov_qresp( opc, ss, LDAP_SYNC_DELETE );
1339                 } else if ( !saveit ) {
1340                         syncprov_qresp( opc, ss, LDAP_SYNC_NEW_COOKIE );
1341                 }
1342                 if ( !saveit && found ) {
1343                         /* Decrement s_inuse, was incremented when called
1344                          * with saveit == TRUE
1345                          */
1346                         syncprov_free_syncop( ss );
1347                 }
1348         }
1349         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1350
1351         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1352                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1353                         op->o_bd = &db;
1354                 }
1355                 if ( saveit )
1356                         overlay_entry_release_ov( op, e, 0, on );
1357                 op->o_bd = b0;
1358         }
1359         if ( opc->se && !saveit ) {
1360                 if ( !dec_mutexint( opc->se->e_private )) {
1361                         opc->se->e_private = NULL;
1362                         entry_free( opc->se );
1363                         opc->se = NULL;
1364                 }
1365         }
1366         if ( freefdn ) {
1367                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1368         }
1369         op->o_bd = b0;
1370 }
1371
1372 static int
1373 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1374 {
1375         slap_callback *cb = op->o_callback;
1376         opcookie *opc = cb->sc_private;
1377         slap_overinst *on = opc->son;
1378         syncprov_info_t         *si = on->on_bi.bi_private;
1379         syncmatches *sm, *snext;
1380         modtarget *mt, mtdummy;
1381
1382         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1383         if ( si->si_active )
1384                 si->si_active--;
1385         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1386
1387         for (sm = opc->smatches; sm; sm=snext) {
1388                 snext = sm->sm_next;
1389                 syncprov_free_syncop( sm->sm_op );
1390                 op->o_tmpfree( sm, op->o_tmpmemctx );
1391         }
1392
1393         /* Remove op from lock table */
1394         mt = opc->smt;
1395         if ( mt ) {
1396                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1397                 mt->mt_mods = mt->mt_mods->mi_next;
1398                 /* If there are more, promote the next one */
1399                 if ( mt->mt_mods ) {
1400                         mt->mt_op = mt->mt_mods->mi_op;
1401                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1402                 } else {
1403                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1404                         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1405                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1406                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1407                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1408                         ch_free( mt );
1409                 }
1410         }
1411         if ( !BER_BVISNULL( &opc->suuid ))
1412                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1413         if ( !BER_BVISNULL( &opc->sndn ))
1414                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1415         if ( !BER_BVISNULL( &opc->sdn ))
1416                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1417         op->o_callback = cb->sc_next;
1418         op->o_tmpfree(cb, op->o_tmpmemctx);
1419
1420         return 0;
1421 }
1422
1423 static void
1424 syncprov_checkpoint( Operation *op, SlapReply *rs, slap_overinst *on )
1425 {
1426         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
1427         Modifications mod;
1428         Operation opm;
1429         SlapReply rsm = { 0 };
1430         slap_callback cb = {0};
1431         BackendDB be;
1432         BackendInfo *bi;
1433
1434 #ifdef CHECK_CSN
1435         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1436
1437         int i;
1438         for ( i=0; i<si->si_numcsns; i++ ) {
1439                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1440         }
1441 #endif
1442         mod.sml_numvals = si->si_numcsns;
1443         mod.sml_values = si->si_ctxcsn;
1444         mod.sml_nvalues = NULL;
1445         mod.sml_desc = slap_schema.si_ad_contextCSN;
1446         mod.sml_op = LDAP_MOD_REPLACE;
1447         mod.sml_flags = SLAP_MOD_INTERNAL;
1448         mod.sml_next = NULL;
1449
1450         cb.sc_response = slap_null_cb;
1451         opm = *op;
1452         opm.o_tag = LDAP_REQ_MODIFY;
1453         opm.o_callback = &cb;
1454         opm.orm_modlist = &mod;
1455         opm.orm_no_opattrs = 1;
1456         if ( SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1457                 be = *on->on_info->oi_origdb;
1458                 opm.o_bd = &be;
1459         }
1460         opm.o_req_dn = si->si_contextdn;
1461         opm.o_req_ndn = si->si_contextdn;
1462         bi = opm.o_bd->bd_info;
1463         opm.o_bd->bd_info = on->on_info->oi_orig;
1464         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1465         opm.o_no_schema_check = 1;
1466         opm.o_bd->be_modify( &opm, &rsm );
1467
1468         if ( rsm.sr_err == LDAP_NO_SUCH_OBJECT &&
1469                 SLAP_SYNC_SUBENTRY( opm.o_bd )) {
1470                 const char      *text;
1471                 char txtbuf[SLAP_TEXT_BUFLEN];
1472                 size_t textlen = sizeof txtbuf;
1473                 Entry *e = slap_create_context_csn_entry( opm.o_bd, NULL );
1474                 slap_mods2entry( &mod, &e, 0, 1, &text, txtbuf, textlen);
1475                 opm.ora_e = e;
1476                 opm.o_bd->be_add( &opm, &rsm );
1477                 if ( e == opm.ora_e )
1478                         be_entry_release_w( &opm, opm.ora_e );
1479         }
1480         opm.o_bd->bd_info = bi;
1481
1482         if ( mod.sml_next != NULL ) {
1483                 slap_mods_free( mod.sml_next, 1 );
1484         }
1485 #ifdef CHECK_CSN
1486         for ( i=0; i<si->si_numcsns; i++ ) {
1487                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1488         }
1489 #endif
1490 }
1491
1492 static void
1493 syncprov_add_slog( Operation *op )
1494 {
1495         opcookie *opc = op->o_callback->sc_private;
1496         slap_overinst *on = opc->son;
1497         syncprov_info_t         *si = on->on_bi.bi_private;
1498         sessionlog *sl;
1499         slog_entry *se;
1500
1501         sl = si->si_logs;
1502         {
1503                 /* Allocate a record. UUIDs are not NUL-terminated. */
1504                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1505                         op->o_csn.bv_len + 1 );
1506                 se->se_next = NULL;
1507                 se->se_tag = op->o_tag;
1508
1509                 se->se_uuid.bv_val = (char *)(&se[1]);
1510                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1511                 se->se_uuid.bv_len = opc->suuid.bv_len;
1512
1513                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1514                 AC_MEMCPY( se->se_csn.bv_val, op->o_csn.bv_val, op->o_csn.bv_len );
1515                 se->se_csn.bv_val[op->o_csn.bv_len] = '\0';
1516                 se->se_csn.bv_len = op->o_csn.bv_len;
1517                 se->se_sid = slap_parse_csn_sid( &se->se_csn );
1518
1519                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1520                 if ( sl->sl_head ) {
1521                         sl->sl_tail->se_next = se;
1522                 } else {
1523                         sl->sl_head = se;
1524                 }
1525                 sl->sl_tail = se;
1526                 sl->sl_num++;
1527                 while ( sl->sl_num > sl->sl_size ) {
1528                         se = sl->sl_head;
1529                         sl->sl_head = se->se_next;
1530                         strcpy( sl->sl_mincsn.bv_val, se->se_csn.bv_val );
1531                         sl->sl_mincsn.bv_len = se->se_csn.bv_len;
1532                         ch_free( se );
1533                         sl->sl_num--;
1534                 }
1535                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1536         }
1537 }
1538
1539 /* Just set a flag if we found the matching entry */
1540 static int
1541 playlog_cb( Operation *op, SlapReply *rs )
1542 {
1543         if ( rs->sr_type == REP_SEARCH ) {
1544                 op->o_callback->sc_private = (void *)1;
1545         }
1546         return rs->sr_err;
1547 }
1548
1549 /* enter with sl->sl_mutex locked, release before returning */
1550 static void
1551 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1552         sync_control *srs, BerVarray ctxcsn, int numcsns, int *sids )
1553 {
1554         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1555         slog_entry *se;
1556         int i, j, ndel, num, nmods, mmods;
1557         char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
1558         BerVarray uuids;
1559         struct berval delcsn[2];
1560
1561         if ( !sl->sl_num ) {
1562                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1563                 return;
1564         }
1565
1566         num = sl->sl_num;
1567         i = 0;
1568         nmods = 0;
1569
1570         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1571                 num * UUID_LEN, op->o_tmpmemctx );
1572         uuids[0].bv_val = (char *)(uuids + num + 1);
1573
1574         delcsn[0].bv_len = 0;
1575         delcsn[0].bv_val = cbuf;
1576         BER_BVZERO(&delcsn[1]);
1577
1578         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1579          * and everything else at the end. Do this first so we can
1580          * unlock the list mutex.
1581          */
1582         Debug( LDAP_DEBUG_SYNC, "srs csn %s\n",
1583                 srs->sr_state.ctxcsn[0].bv_val, 0, 0 );
1584         for ( se=sl->sl_head; se; se=se->se_next ) {
1585                 int k;
1586                 Debug( LDAP_DEBUG_SYNC, "log csn %s\n", se->se_csn.bv_val, 0, 0 );
1587                 ndel = 1;
1588                 for ( k=0; k<srs->sr_state.numcsns; k++ ) {
1589                         if ( se->se_sid == srs->sr_state.sids[k] ) {
1590                                 ndel = ber_bvcmp( &se->se_csn, &srs->sr_state.ctxcsn[k] );
1591                                 break;
1592                         }
1593                 }
1594                 if ( ndel <= 0 ) {
1595                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too old\n", ndel, 0, 0 );
1596                         continue;
1597                 }
1598                 ndel = 0;
1599                 for ( k=0; k<numcsns; k++ ) {
1600                         if ( se->se_sid == sids[k] ) {
1601                                 ndel = ber_bvcmp( &se->se_csn, &ctxcsn[k] );
1602                                 break;
1603                         }
1604                 }
1605                 if ( ndel > 0 ) {
1606                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too new\n", ndel, 0, 0 );
1607                         break;
1608                 }
1609                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1610                         j = i;
1611                         i++;
1612                         AC_MEMCPY( cbuf, se->se_csn.bv_val, se->se_csn.bv_len );
1613                         delcsn[0].bv_len = se->se_csn.bv_len;
1614                         delcsn[0].bv_val[delcsn[0].bv_len] = '\0';
1615                 } else {
1616                         nmods++;
1617                         j = num - nmods;
1618                 }
1619                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1620                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1621                 uuids[j].bv_len = UUID_LEN;
1622         }
1623         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1624
1625         ndel = i;
1626
1627         /* Zero out unused slots */
1628         for ( i=ndel; i < num - nmods; i++ )
1629                 uuids[i].bv_len = 0;
1630
1631         /* Mods must be validated to see if they belong in this delete set.
1632          */
1633
1634         mmods = nmods;
1635         /* Strip any duplicates */
1636         for ( i=0; i<nmods; i++ ) {
1637                 for ( j=0; j<ndel; j++ ) {
1638                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1639                                 uuids[num - 1 - i].bv_len = 0;
1640                                 mmods --;
1641                                 break;
1642                         }
1643                 }
1644                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1645                 for ( j=0; j<i; j++ ) {
1646                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1647                                 uuids[num - 1 - i].bv_len = 0;
1648                                 mmods --;
1649                                 break;
1650                         }
1651                 }
1652         }
1653
1654         if ( mmods ) {
1655                 Operation fop;
1656                 SlapReply frs = { REP_RESULT };
1657                 int rc;
1658                 Filter mf, af;
1659                 AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
1660                 slap_callback cb = {0};
1661
1662                 fop = *op;
1663
1664                 fop.o_sync_mode = 0;
1665                 fop.o_callback = &cb;
1666                 fop.ors_limit = NULL;
1667                 fop.ors_tlimit = SLAP_NO_LIMIT;
1668                 fop.ors_attrs = slap_anlist_all_attributes;
1669                 fop.ors_attrsonly = 0;
1670                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1671
1672                 af.f_choice = LDAP_FILTER_AND;
1673                 af.f_next = NULL;
1674                 af.f_and = &mf;
1675                 mf.f_choice = LDAP_FILTER_EQUALITY;
1676                 mf.f_ava = &eq;
1677                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1678                 mf.f_next = fop.ors_filter;
1679
1680                 fop.ors_filter = &af;
1681
1682                 cb.sc_response = playlog_cb;
1683                 fop.o_bd->bd_info = (BackendInfo *)on->on_info;
1684
1685                 for ( i=ndel; i<num; i++ ) {
1686                         if ( uuids[i].bv_len == 0 ) continue;
1687
1688                         mf.f_av_value = uuids[i];
1689                         cb.sc_private = NULL;
1690                         fop.ors_slimit = 1;
1691                         frs.sr_nentries = 0;
1692                         rc = fop.o_bd->be_search( &fop, &frs );
1693
1694                         /* If entry was not found, add to delete list */
1695                         if ( !cb.sc_private ) {
1696                                 uuids[ndel++] = uuids[i];
1697                         }
1698                 }
1699                 fop.o_bd->bd_info = (BackendInfo *)on;
1700         }
1701         if ( ndel ) {
1702                 struct berval cookie;
1703
1704                 if ( delcsn[0].bv_len ) {
1705                         slap_compose_sync_cookie( op, &cookie, delcsn, srs->sr_state.rid,
1706                                 slap_serverID ? slap_serverID : -1 );
1707
1708                         Debug( LDAP_DEBUG_SYNC, "syncprov_playlog: cookie=%s\n", cookie.bv_val, 0, 0 );
1709                 }
1710
1711                 uuids[ndel].bv_val = NULL;
1712                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET,
1713                         delcsn[0].bv_len ? &cookie : NULL, 0, uuids, 1 );
1714                 if ( delcsn[0].bv_len ) {
1715                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1716                 }
1717         }
1718         op->o_tmpfree( uuids, op->o_tmpmemctx );
1719 }
1720
1721 static int
1722 syncprov_op_response( Operation *op, SlapReply *rs )
1723 {
1724         opcookie *opc = op->o_callback->sc_private;
1725         slap_overinst *on = opc->son;
1726         syncprov_info_t         *si = on->on_bi.bi_private;
1727         syncmatches *sm;
1728
1729         if ( rs->sr_err == LDAP_SUCCESS )
1730         {
1731                 struct berval maxcsn;
1732                 char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
1733                 int do_check = 0, have_psearches, foundit, csn_changed = 0;
1734
1735                 ldap_pvt_thread_mutex_lock( &si->si_resp_mutex );
1736
1737                 /* Update our context CSN */
1738                 cbuf[0] = '\0';
1739                 maxcsn.bv_val = cbuf;
1740                 maxcsn.bv_len = sizeof(cbuf);
1741                 ldap_pvt_thread_rdwr_wlock( &si->si_csn_rwlock );
1742
1743                 slap_get_commit_csn( op, &maxcsn, &foundit );
1744                 if ( BER_BVISEMPTY( &maxcsn ) && SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1745                         /* syncrepl queues the CSN values in the db where
1746                          * it is configured , not where the changes are made.
1747                          * So look for a value in the glue db if we didn't
1748                          * find any in this db.
1749                          */
1750                         BackendDB *be = op->o_bd;
1751                         op->o_bd = select_backend( &be->be_nsuffix[0], 1);
1752                         maxcsn.bv_val = cbuf;
1753                         maxcsn.bv_len = sizeof(cbuf);
1754                         slap_get_commit_csn( op, &maxcsn, &foundit );
1755                         op->o_bd = be;
1756                 }
1757                 if ( !BER_BVISEMPTY( &maxcsn ) ) {
1758                         int i, sid;
1759 #ifdef CHECK_CSN
1760                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1761                         assert( !syn->ssyn_validate( syn, &maxcsn ));
1762 #endif
1763                         sid = slap_parse_csn_sid( &maxcsn );
1764                         for ( i=0; i<si->si_numcsns; i++ ) {
1765                                 if ( sid == si->si_sids[i] ) {
1766                                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn[i] ) > 0 ) {
1767                                                 ber_bvreplace( &si->si_ctxcsn[i], &maxcsn );
1768                                                 csn_changed = 1;
1769                                         }
1770                                         break;
1771                                 }
1772                         }
1773                         /* It's a new SID for us */
1774                         if ( i == si->si_numcsns ) {
1775                                 value_add_one( &si->si_ctxcsn, &maxcsn );
1776                                 csn_changed = 1;
1777                                 si->si_numcsns++;
1778                                 si->si_sids = ch_realloc( si->si_sids, si->si_numcsns *
1779                                         sizeof(int));
1780                                 si->si_sids[i] = sid;
1781                         }
1782                 }
1783
1784                 /* Don't do any processing for consumer contextCSN updates */
1785                 if ( op->o_dont_replicate ) {
1786                         if ( op->o_tag == LDAP_REQ_MODIFY &&
1787                                 op->orm_modlist->sml_op == LDAP_MOD_REPLACE &&
1788                                 op->orm_modlist->sml_desc == slap_schema.si_ad_contextCSN ) {
1789                         /* Catch contextCSN updates from syncrepl. We have to look at
1790                          * all the attribute values, as there may be more than one csn
1791                          * that changed, and only one can be passed in the csn queue.
1792                          */
1793                         Modifications *mod = op->orm_modlist;
1794                         int i, j, sid;
1795
1796                         for ( i=0; i<mod->sml_numvals; i++ ) {
1797                                 sid = slap_parse_csn_sid( &mod->sml_values[i] );
1798                                 for ( j=0; j<si->si_numcsns; j++ ) {
1799                                         if ( sid == si->si_sids[j] ) {
1800                                                 if ( ber_bvcmp( &mod->sml_values[i], &si->si_ctxcsn[j] ) > 0 ) {
1801                                                         ber_bvreplace( &si->si_ctxcsn[j], &mod->sml_values[i] );
1802                                                         csn_changed = 1;
1803                                                 }
1804                                                 break;
1805                                         }
1806                                 }
1807
1808                                 if ( j == si->si_numcsns ) {
1809                                         value_add_one( &si->si_ctxcsn, &mod->sml_values[i] );
1810                                         si->si_numcsns++;
1811                                         si->si_sids = ch_realloc( si->si_sids, si->si_numcsns *
1812                                                 sizeof(int));
1813                                         si->si_sids[j] = sid;
1814                                         csn_changed = 1;
1815                                 }
1816                         }
1817                         if ( csn_changed )
1818                                 si->si_dirty = 0;
1819                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1820
1821                         if ( csn_changed ) {
1822                                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1823                                 have_psearches = ( si->si_ops != NULL );
1824                                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1825
1826                                 if ( have_psearches ) {
1827                                         for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1828                                                 if ( sm->sm_op->s_op->o_abandon )
1829                                                         continue;
1830                                                 syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_NEW_COOKIE );
1831                                         }
1832                                 }
1833                         }
1834                         } else {
1835                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1836                         }
1837                         goto leave;
1838                 }
1839
1840                 si->si_numops++;
1841                 if ( si->si_chkops || si->si_chktime ) {
1842                         /* Never checkpoint adding the context entry,
1843                          * it will deadlock
1844                          */
1845                         if ( op->o_tag != LDAP_REQ_ADD ||
1846                                 !dn_match( &op->o_req_ndn, &si->si_contextdn )) {
1847                                 if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1848                                         do_check = 1;
1849                                         si->si_numops = 0;
1850                                 }
1851                                 if ( si->si_chktime &&
1852                                         (op->o_time - si->si_chklast >= si->si_chktime )) {
1853                                         if ( si->si_chklast ) {
1854                                                 do_check = 1;
1855                                                 si->si_chklast = op->o_time;
1856                                         } else {
1857                                                 si->si_chklast = 1;
1858                                         }
1859                                 }
1860                         }
1861                 }
1862                 si->si_dirty = !csn_changed;
1863                 ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1864
1865                 if ( do_check ) {
1866                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1867                         syncprov_checkpoint( op, rs, on );
1868                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1869                 }
1870
1871                 /* only update consumer ctx if this is a newer csn */
1872                 if ( csn_changed ) {
1873                         opc->sctxcsn = maxcsn;
1874                 }
1875
1876                 /* Handle any persistent searches */
1877                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1878                 have_psearches = ( si->si_ops != NULL );
1879                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1880                 if ( have_psearches ) {
1881                         switch(op->o_tag) {
1882                         case LDAP_REQ_ADD:
1883                         case LDAP_REQ_MODIFY:
1884                         case LDAP_REQ_MODRDN:
1885                         case LDAP_REQ_EXTENDED:
1886                                 syncprov_matchops( op, opc, 0 );
1887                                 break;
1888                         case LDAP_REQ_DELETE:
1889                                 /* for each match in opc->smatches:
1890                                  *   send DELETE msg
1891                                  */
1892                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1893                                         if ( sm->sm_op->s_op->o_abandon )
1894                                                 continue;
1895                                         syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_DELETE );
1896                                 }
1897                                 break;
1898                         }
1899                 }
1900
1901                 /* Add any log records */
1902                 if ( si->si_logs && op->o_tag != LDAP_REQ_ADD ) {
1903                         syncprov_add_slog( op );
1904                 }
1905 leave:          ldap_pvt_thread_mutex_unlock( &si->si_resp_mutex );
1906         }
1907         return SLAP_CB_CONTINUE;
1908 }
1909
1910 /* We don't use a subentry to store the context CSN any more.
1911  * We expose the current context CSN as an operational attribute
1912  * of the suffix entry.
1913  */
1914 static int
1915 syncprov_op_compare( Operation *op, SlapReply *rs )
1916 {
1917         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1918         syncprov_info_t         *si = on->on_bi.bi_private;
1919         int rc = SLAP_CB_CONTINUE;
1920
1921         if ( dn_match( &op->o_req_ndn, &si->si_contextdn ) &&
1922                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1923         {
1924                 Entry e = {0};
1925                 Attribute a = {0};
1926
1927                 e.e_name = si->si_contextdn;
1928                 e.e_nname = si->si_contextdn;
1929                 e.e_attrs = &a;
1930
1931                 a.a_desc = slap_schema.si_ad_contextCSN;
1932
1933                 ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1934
1935                 a.a_vals = si->si_ctxcsn;
1936                 a.a_nvals = a.a_vals;
1937                 a.a_numvals = si->si_numcsns;
1938
1939                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1940                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1941                 if ( ! rs->sr_err ) {
1942                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1943                         goto return_results;
1944                 }
1945
1946                 if ( get_assert( op ) &&
1947                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
1948                 {
1949                         rs->sr_err = LDAP_ASSERTION_FAILED;
1950                         goto return_results;
1951                 }
1952
1953
1954                 rs->sr_err = LDAP_COMPARE_FALSE;
1955
1956                 if ( attr_valfind( &a,
1957                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
1958                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
1959                                 &op->oq_compare.rs_ava->aa_value, NULL, op->o_tmpmemctx ) == 0 )
1960                 {
1961                         rs->sr_err = LDAP_COMPARE_TRUE;
1962                 }
1963
1964 return_results:;
1965
1966                 ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1967
1968                 send_ldap_result( op, rs );
1969
1970                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
1971                         rs->sr_err = LDAP_SUCCESS;
1972                 }
1973                 rc = rs->sr_err;
1974         }
1975
1976         return rc;
1977 }
1978
1979 static int
1980 syncprov_op_mod( Operation *op, SlapReply *rs )
1981 {
1982         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1983         syncprov_info_t         *si = on->on_bi.bi_private;
1984         slap_callback *cb;
1985         opcookie *opc;
1986         int have_psearches, cbsize;
1987
1988         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1989         have_psearches = ( si->si_ops != NULL );
1990         si->si_active++;
1991         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1992
1993         cbsize = sizeof(slap_callback) + sizeof(opcookie) +
1994                 (have_psearches ? sizeof(modinst) : 0 );
1995
1996         cb = op->o_tmpcalloc(1, cbsize, op->o_tmpmemctx);
1997         opc = (opcookie *)(cb+1);
1998         opc->son = on;
1999         cb->sc_response = syncprov_op_response;
2000         cb->sc_cleanup = syncprov_op_cleanup;
2001         cb->sc_private = opc;
2002         cb->sc_next = op->o_callback;
2003         op->o_callback = cb;
2004
2005         opc->osid = -1;
2006         opc->rsid = -1;
2007         if ( op->o_csn.bv_val ) {
2008                 opc->osid = slap_parse_csn_sid( &op->o_csn );
2009         }
2010         if ( op->o_controls ) {
2011                 struct sync_cookie *scook =
2012                 op->o_controls[slap_cids.sc_LDAPsync];
2013                 if ( scook )
2014                         opc->rsid = scook->sid;
2015         }
2016
2017         /* If there are active persistent searches, lock this operation.
2018          * See seqmod.c for the locking logic on its own.
2019          */
2020         if ( have_psearches ) {
2021                 modtarget *mt, mtdummy;
2022                 modinst *mi;
2023
2024                 mi = (modinst *)(opc+1);
2025                 mi->mi_op = op;
2026
2027                 /* See if we're already modifying this entry... */
2028                 mtdummy.mt_op = op;
2029                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
2030                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
2031                 if ( mt ) {
2032                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
2033                         if ( mt->mt_mods == NULL ) {
2034                                 /* Cannot reuse this mt, as another thread is about
2035                                  * to release it in syncprov_op_cleanup.
2036                                  */
2037                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2038                                 mt = NULL;
2039                         }
2040                 }
2041                 if ( mt ) {
2042                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
2043                         mt->mt_tail->mi_next = mi;
2044                         mt->mt_tail = mi;
2045                         /* wait for this op to get to head of list */
2046                         while ( mt->mt_mods != mi ) {
2047                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2048                                 /* FIXME: if dynamic config can delete overlays or
2049                                  * databases we'll have to check for cleanup here.
2050                                  * Currently it's not an issue because there are
2051                                  * no dynamic config deletes...
2052                                  */
2053                                 if ( slapd_shutdown )
2054                                         return SLAPD_ABANDON;
2055
2056                                 if ( !ldap_pvt_thread_pool_pausecheck( &connection_pool ))
2057                                         ldap_pvt_thread_yield();
2058                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
2059
2060                                 /* clean up if the caller is giving up */
2061                                 if ( op->o_abandon ) {
2062                                         modinst *m2;
2063                                         for ( m2 = mt->mt_mods; m2->mi_next != mi;
2064                                                 m2 = m2->mi_next );
2065                                         m2->mi_next = mi->mi_next;
2066                                         if ( mt->mt_tail == mi ) mt->mt_tail = m2;
2067                                         op->o_tmpfree( cb, op->o_tmpmemctx );
2068                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2069                                         return SLAPD_ABANDON;
2070                                 }
2071                         }
2072                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2073                 } else {
2074                         /* Record that we're modifying this entry now */
2075                         mt = ch_malloc( sizeof(modtarget) );
2076                         mt->mt_mods = mi;
2077                         mt->mt_tail = mi;
2078                         mt->mt_op = mi->mi_op;
2079                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
2080                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
2081                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
2082                 }
2083                 opc->smt = mt;
2084         }
2085
2086         if (( have_psearches || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
2087                 syncprov_matchops( op, opc, 1 );
2088
2089         return SLAP_CB_CONTINUE;
2090 }
2091
2092 static int
2093 syncprov_op_extended( Operation *op, SlapReply *rs )
2094 {
2095         if ( exop_is_write( op ))
2096                 return syncprov_op_mod( op, rs );
2097
2098         return SLAP_CB_CONTINUE;
2099 }
2100
2101 typedef struct searchstate {
2102         slap_overinst *ss_on;
2103         syncops *ss_so;
2104         BerVarray ss_ctxcsn;
2105         int *ss_sids;
2106         int ss_numcsns;
2107 #define SS_PRESENT      0x01
2108 #define SS_CHANGED      0x02
2109         int ss_flags;
2110 } searchstate;
2111
2112 static int
2113 syncprov_search_cleanup( Operation *op, SlapReply *rs )
2114 {
2115         if ( rs->sr_ctrls ) {
2116                 op->o_tmpfree( rs->sr_ctrls[0], op->o_tmpmemctx );
2117                 op->o_tmpfree( rs->sr_ctrls, op->o_tmpmemctx );
2118                 rs->sr_ctrls = NULL;
2119         }
2120         return 0;
2121 }
2122
2123 typedef struct SyncOperationBuffer {
2124         Operation               sob_op;
2125         Opheader                sob_hdr;
2126         OpExtra                 sob_oe;
2127         AttributeName   sob_extra;      /* not always present */
2128         /* Further data allocated here */
2129 } SyncOperationBuffer;
2130
2131 static void
2132 syncprov_detach_op( Operation *op, syncops *so, slap_overinst *on )
2133 {
2134         SyncOperationBuffer *sopbuf2;
2135         Operation *op2;
2136         int i, alen = 0;
2137         size_t size;
2138         char *ptr;
2139         GroupAssertion *g1, *g2;
2140
2141         /* count the search attrs */
2142         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2143                 alen += op->ors_attrs[i].an_name.bv_len + 1;
2144         }
2145         /* Make a new copy of the operation */
2146         size = offsetof( SyncOperationBuffer, sob_extra ) +
2147                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
2148                 op->o_req_dn.bv_len + 1 +
2149                 op->o_req_ndn.bv_len + 1 +
2150                 op->o_ndn.bv_len + 1 +
2151                 so->s_filterstr.bv_len + 1;
2152         sopbuf2 = ch_calloc( 1, size );
2153         op2 = &sopbuf2->sob_op;
2154         op2->o_hdr = &sopbuf2->sob_hdr;
2155         LDAP_SLIST_FIRST(&op2->o_extra) = &sopbuf2->sob_oe;
2156
2157         /* Copy the fields we care about explicitly, leave the rest alone */
2158         *op2->o_hdr = *op->o_hdr;
2159         op2->o_tag = op->o_tag;
2160         op2->o_time = op->o_time;
2161         op2->o_bd = on->on_info->oi_origdb;
2162         op2->o_request = op->o_request;
2163         op2->o_managedsait = op->o_managedsait;
2164         LDAP_SLIST_FIRST(&op2->o_extra)->oe_key = on;
2165         LDAP_SLIST_NEXT(LDAP_SLIST_FIRST(&op2->o_extra), oe_next) = NULL;
2166
2167         ptr = (char *) sopbuf2 + offsetof( SyncOperationBuffer, sob_extra );
2168         if ( i ) {
2169                 op2->ors_attrs = (AttributeName *) ptr;
2170                 ptr = (char *) &op2->ors_attrs[i+1];
2171                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2172                         op2->ors_attrs[i] = op->ors_attrs[i];
2173                         op2->ors_attrs[i].an_name.bv_val = ptr;
2174                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
2175                 }
2176                 BER_BVZERO( &op2->ors_attrs[i].an_name );
2177         }
2178
2179         op2->o_authz = op->o_authz;
2180         op2->o_ndn.bv_val = ptr;
2181         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
2182         op2->o_dn = op2->o_ndn;
2183         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
2184         op2->o_req_dn.bv_val = ptr;
2185         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
2186         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
2187         op2->o_req_ndn.bv_val = ptr;
2188         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
2189         op2->ors_filterstr.bv_val = ptr;
2190         strcpy( ptr, so->s_filterstr.bv_val );
2191         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
2192
2193         /* Skip the AND/GE clause that we stuck on in front */
2194         if ( so->s_flags & PS_FIX_FILTER ) {
2195                 op2->ors_filter = op->ors_filter->f_and->f_next;
2196                 so->s_flags ^= PS_FIX_FILTER;
2197         } else {
2198                 op2->ors_filter = op->ors_filter;
2199         }
2200         op2->ors_filter = filter_dup( op2->ors_filter, NULL );
2201         so->s_op = op2;
2202
2203         /* Copy any cached group ACLs individually */
2204         op2->o_groups = NULL;
2205         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
2206                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
2207                 *g2 = *g1;
2208                 strcpy( g2->ga_ndn, g1->ga_ndn );
2209                 g2->ga_next = op2->o_groups;
2210                 op2->o_groups = g2;
2211         }
2212         /* Don't allow any further group caching */
2213         op2->o_do_not_cache = 1;
2214
2215         /* Add op2 to conn so abandon will find us */
2216         op->o_conn->c_n_ops_executing++;
2217         op->o_conn->c_n_ops_completed--;
2218         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
2219         so->s_flags |= PS_IS_DETACHED;
2220
2221         /* Prevent anyone else from trying to send a result for this op */
2222         op->o_abandon = 1;
2223 }
2224
2225 static int
2226 syncprov_search_response( Operation *op, SlapReply *rs )
2227 {
2228         searchstate *ss = op->o_callback->sc_private;
2229         slap_overinst *on = ss->ss_on;
2230         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2231         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
2232
2233         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
2234                 Attribute *a;
2235                 /* If we got a referral without a referral object, there's
2236                  * something missing that we cannot replicate. Just ignore it.
2237                  * The consumer will abort because we didn't send the expected
2238                  * control.
2239                  */
2240                 if ( !rs->sr_entry ) {
2241                         assert( rs->sr_entry != NULL );
2242                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
2243                         return SLAP_CB_CONTINUE;
2244                 }
2245                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryCSN );
2246                 if ( a == NULL && rs->sr_operational_attrs != NULL ) {
2247                         a = attr_find( rs->sr_operational_attrs, slap_schema.si_ad_entryCSN );
2248                 }
2249                 if ( a ) {
2250                         int i, sid;
2251                         sid = slap_parse_csn_sid( &a->a_nvals[0] );
2252
2253                         /* Don't send changed entries back to the originator */
2254                         if ( sid == srs->sr_state.sid && srs->sr_state.numcsns ) {
2255                                 Debug( LDAP_DEBUG_SYNC,
2256                                         "Entry %s changed by peer, ignored\n",
2257                                         rs->sr_entry->e_name.bv_val, 0, 0 );
2258                                 return LDAP_SUCCESS;
2259                         }
2260
2261                         /* If not a persistent search */
2262                         if ( !ss->ss_so ) {
2263                                 /* Make sure entry is less than the snapshot'd contextCSN */
2264                                 for ( i=0; i<ss->ss_numcsns; i++ ) {
2265                                         if ( sid == ss->ss_sids[i] && ber_bvcmp( &a->a_nvals[0],
2266                                                 &ss->ss_ctxcsn[i] ) > 0 ) {
2267                                                 Debug( LDAP_DEBUG_SYNC,
2268                                                         "Entry %s CSN %s greater than snapshot %s\n",
2269                                                         rs->sr_entry->e_name.bv_val,
2270                                                         a->a_nvals[0].bv_val,
2271                                                         ss->ss_ctxcsn[i].bv_val );
2272                                                 return LDAP_SUCCESS;
2273                                         }
2274                                 }
2275                         }
2276
2277                         /* Don't send old entries twice */
2278                         if ( srs->sr_state.ctxcsn ) {
2279                                 for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2280                                         if ( sid == srs->sr_state.sids[i] &&
2281                                                 ber_bvcmp( &a->a_nvals[0],
2282                                                         &srs->sr_state.ctxcsn[i] )<= 0 ) {
2283                                                 Debug( LDAP_DEBUG_SYNC,
2284                                                         "Entry %s CSN %s older or equal to ctx %s\n",
2285                                                         rs->sr_entry->e_name.bv_val,
2286                                                         a->a_nvals[0].bv_val,
2287                                                         srs->sr_state.ctxcsn[i].bv_val );
2288                                                 return LDAP_SUCCESS;
2289                                         }
2290                                 }
2291                         }
2292                 }
2293                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2294                         op->o_tmpmemctx );
2295                 rs->sr_ctrls[1] = NULL;
2296                 /* If we're in delta-sync mode, always send a cookie */
2297                 if ( si->si_nopres && si->si_usehint && a ) {
2298                         struct berval cookie;
2299                         slap_compose_sync_cookie( op, &cookie, a->a_nvals, srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2300                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2301                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 1, &cookie );
2302                 } else {
2303                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2304                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
2305                 }
2306         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
2307                 struct berval cookie = BER_BVNULL;
2308
2309                 if ( ( ss->ss_flags & SS_CHANGED ) &&
2310                         ss->ss_ctxcsn && !BER_BVISNULL( &ss->ss_ctxcsn[0] )) {
2311                         slap_compose_sync_cookie( op, &cookie, ss->ss_ctxcsn,
2312                                 srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2313
2314                         Debug( LDAP_DEBUG_SYNC, "syncprov_search_response: cookie=%s\n", cookie.bv_val, 0, 0 );
2315                 }
2316
2317                 /* Is this a regular refresh?
2318                  * Note: refresh never gets here if there were no changes
2319                  */
2320                 if ( !ss->ss_so ) {
2321                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2322                                 op->o_tmpmemctx );
2323                         rs->sr_ctrls[1] = NULL;
2324                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
2325                                 0, 1, &cookie, ( ss->ss_flags & SS_PRESENT ) ?  LDAP_SYNC_REFRESH_PRESENTS :
2326                                         LDAP_SYNC_REFRESH_DELETES );
2327                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2328                 } else {
2329                 /* It's RefreshAndPersist, transition to Persist phase */
2330                         syncprov_sendinfo( op, rs, ( ss->ss_flags & SS_PRESENT ) ?
2331                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
2332                                 ( ss->ss_flags & SS_CHANGED ) ? &cookie : NULL,
2333                                 1, NULL, 0 );
2334                         if ( !BER_BVISNULL( &cookie ))
2335                                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2336
2337                         /* Detach this Op from frontend control */
2338                         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
2339
2340                         /* But not if this connection was closed along the way */
2341                         if ( op->o_abandon ) {
2342                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2343                                 /* syncprov_ab_cleanup will free this syncop */
2344                                 return SLAPD_ABANDON;
2345
2346                         } else {
2347                                 ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
2348                                 /* Turn off the refreshing flag */
2349                                 ss->ss_so->s_flags ^= PS_IS_REFRESHING;
2350
2351                                 syncprov_detach_op( op, ss->ss_so, on );
2352
2353                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2354
2355                                 /* If there are queued responses, fire them off */
2356                                 if ( ss->ss_so->s_res )
2357                                         syncprov_qstart( ss->ss_so );
2358                                 ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
2359                         }
2360
2361                         return LDAP_SUCCESS;
2362                 }
2363         }
2364
2365         return SLAP_CB_CONTINUE;
2366 }
2367
2368 static int
2369 syncprov_op_search( Operation *op, SlapReply *rs )
2370 {
2371         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2372         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2373         slap_callback   *cb;
2374         int gotstate = 0, changed = 0, do_present = 0;
2375         syncops *sop = NULL;
2376         searchstate *ss;
2377         sync_control *srs;
2378         BerVarray ctxcsn;
2379         int i, *sids, numcsns;
2380         struct berval mincsn;
2381         int dirty = 0;
2382
2383         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
2384
2385         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
2386                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
2387                 return rs->sr_err;
2388         }
2389
2390         srs = op->o_controls[slap_cids.sc_LDAPsync];
2391
2392         /* If this is a persistent search, set it up right away */
2393         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
2394                 syncops so = {0};
2395                 fbase_cookie fc;
2396                 opcookie opc;
2397                 slap_callback sc;
2398
2399                 fc.fss = &so;
2400                 fc.fbase = 0;
2401                 so.s_eid = NOID;
2402                 so.s_op = op;
2403                 so.s_flags = PS_IS_REFRESHING | PS_FIND_BASE;
2404                 /* syncprov_findbase expects to be called as a callback... */
2405                 sc.sc_private = &opc;
2406                 opc.son = on;
2407                 ldap_pvt_thread_mutex_init( &so.s_mutex );
2408                 cb = op->o_callback;
2409                 op->o_callback = &sc;
2410                 rs->sr_err = syncprov_findbase( op, &fc );
2411                 op->o_callback = cb;
2412                 ldap_pvt_thread_mutex_destroy( &so.s_mutex );
2413
2414                 if ( rs->sr_err != LDAP_SUCCESS ) {
2415                         send_ldap_result( op, rs );
2416                         return rs->sr_err;
2417                 }
2418                 sop = ch_malloc( sizeof( syncops ));
2419                 *sop = so;
2420                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
2421                 sop->s_rid = srs->sr_state.rid;
2422                 sop->s_sid = srs->sr_state.sid;
2423                 sop->s_inuse = 1;
2424
2425                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2426                 while ( si->si_active ) {
2427                         /* Wait for active mods to finish before proceeding, as they
2428                          * may already have inspected the si_ops list looking for
2429                          * consumers to replicate the change to.  Using the log
2430                          * doesn't help, as we may finish playing it before the
2431                          * active mods gets added to it.
2432                          */
2433                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2434                         if ( slapd_shutdown )
2435                                 return SLAPD_ABANDON;
2436                         if ( !ldap_pvt_thread_pool_pausecheck( &connection_pool ))
2437                                 ldap_pvt_thread_yield();
2438                         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2439                 }
2440                 sop->s_next = si->si_ops;
2441                 si->si_ops = sop;
2442                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2443         }
2444
2445         /* snapshot the ctxcsn */
2446         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2447         numcsns = si->si_numcsns;
2448         if ( numcsns ) {
2449                 ber_bvarray_dup_x( &ctxcsn, si->si_ctxcsn, op->o_tmpmemctx );
2450                 sids = op->o_tmpalloc( numcsns * sizeof(int), op->o_tmpmemctx );
2451                 for ( i=0; i<numcsns; i++ )
2452                         sids[i] = si->si_sids[i];
2453         } else {
2454                 ctxcsn = NULL;
2455                 sids = NULL;
2456         }
2457         dirty = si->si_dirty;
2458         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2459
2460         /* If we have a cookie, handle the PRESENT lookups */
2461         if ( srs->sr_state.ctxcsn ) {
2462                 sessionlog *sl;
2463                 int i, j;
2464
2465                 /* If we don't have any CSN of our own yet, pretend nothing
2466                  * has changed.
2467                  */
2468                 if ( !numcsns )
2469                         goto no_change;
2470
2471                 if ( !si->si_nopres )
2472                         do_present = SS_PRESENT;
2473
2474                 /* If there are SIDs we don't recognize in the cookie, drop them */
2475                 for (i=0; i<srs->sr_state.numcsns; ) {
2476                         for (j=0; j<numcsns; j++) {
2477                                 if ( srs->sr_state.sids[i] == sids[j] ) {
2478                                         break;
2479                                 }
2480                         }
2481                         /* not found */
2482                         if ( j == numcsns ) {
2483                                 struct berval tmp = srs->sr_state.ctxcsn[i];
2484                                 j = srs->sr_state.numcsns - 1;
2485                                 srs->sr_state.ctxcsn[i] = srs->sr_state.ctxcsn[j];
2486                                 tmp.bv_len = 0;
2487                                 srs->sr_state.ctxcsn[j] = tmp;
2488                                 srs->sr_state.numcsns = j;
2489                                 srs->sr_state.sids[i] = srs->sr_state.sids[j];
2490                                 continue;
2491                         }
2492                         i++;
2493                 }
2494
2495                 /* Find the smallest CSN */
2496                 mincsn = srs->sr_state.ctxcsn[0];
2497                 for ( i=1; i<srs->sr_state.numcsns; i++ ) {
2498                         if ( ber_bvcmp( &mincsn, &srs->sr_state.ctxcsn[i] ) > 0 )
2499                                 mincsn = srs->sr_state.ctxcsn[i];
2500                 }
2501
2502                 /* If nothing has changed, shortcut it */
2503                 if ( srs->sr_state.numcsns == numcsns ) {
2504                         int i, j, newer;
2505                         for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2506                                 for ( j=0; j<numcsns; j++ ) {
2507                                         if ( srs->sr_state.sids[i] != sids[j] )
2508                                                 continue;
2509                                         newer = ber_bvcmp( &srs->sr_state.ctxcsn[i], &ctxcsn[j] );
2510                                         /* If our state is newer, tell consumer about changes */
2511                                         if ( newer < 0 )
2512                                                 changed = SS_CHANGED;
2513                                         else if ( newer > 0 ) {
2514                                         /* our state is older, complain to consumer */
2515                                                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
2516                                                 rs->sr_text = "consumer state is newer than provider!";
2517 bailout:
2518                                                 if ( sop ) {
2519                                                         syncops **sp = &si->si_ops;
2520
2521                                                         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2522                                                         while ( *sp != sop )
2523                                                                 sp = &(*sp)->s_next;
2524                                                         *sp = sop->s_next;
2525                                                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2526                                                         ch_free( sop );
2527                                                 }
2528                                                 rs->sr_ctrls = NULL;
2529                                                 send_ldap_result( op, rs );
2530                                                 return rs->sr_err;
2531                                         }
2532                                         break;
2533                                 }
2534                                 if ( changed )
2535                                         break;
2536                         }
2537                         if ( !changed && !dirty ) {
2538                                 do_present = 0;
2539 no_change:              if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
2540                                         LDAPControl     *ctrls[2];
2541
2542                                         ctrls[0] = NULL;
2543                                         ctrls[1] = NULL;
2544                                         syncprov_done_ctrl( op, rs, ctrls, 0, 0,
2545                                                 NULL, LDAP_SYNC_REFRESH_DELETES );
2546                                         rs->sr_ctrls = ctrls;
2547                                         rs->sr_err = LDAP_SUCCESS;
2548                                         send_ldap_result( op, rs );
2549                                         rs->sr_ctrls = NULL;
2550                                         return rs->sr_err;
2551                                 }
2552                                 goto shortcut;
2553                         }
2554                 } else {
2555                         /* consumer doesn't have the right number of CSNs */
2556                         changed = SS_CHANGED;
2557                 }
2558                 /* Do we have a sessionlog for this search? */
2559                 sl=si->si_logs;
2560                 if ( sl ) {
2561                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
2562                         /* Are there any log entries, and is the consumer state
2563                          * present in the session log?
2564                          */
2565                         if ( sl->sl_num > 0 && ber_bvcmp( &mincsn, &sl->sl_mincsn ) >= 0 ) {
2566                                 do_present = 0;
2567                                 /* mutex is unlocked in playlog */
2568                                 syncprov_playlog( op, rs, sl, srs, ctxcsn, numcsns, sids );
2569                         } else {
2570                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
2571                         }
2572                 }
2573                 /* Is the CSN still present in the database? */
2574                 if ( syncprov_findcsn( op, FIND_CSN ) != LDAP_SUCCESS ) {
2575                         /* No, so a reload is required */
2576                         /* the 2.2 consumer doesn't send this hint */
2577                         if ( si->si_usehint && srs->sr_rhint == 0 ) {
2578                                 if ( ctxcsn )
2579                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2580                                 if ( sids )
2581                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2582                                 rs->sr_err = LDAP_SYNC_REFRESH_REQUIRED;
2583                                 rs->sr_text = "sync cookie is stale";
2584                                 goto bailout;
2585                         }
2586                         if ( srs->sr_state.ctxcsn ) {
2587                                 ber_bvarray_free_x( srs->sr_state.ctxcsn, op->o_tmpmemctx );
2588                                 srs->sr_state.ctxcsn = NULL;
2589                         }
2590                         if ( srs->sr_state.sids ) {
2591                                 slap_sl_free( srs->sr_state.sids, op->o_tmpmemctx );
2592                                 srs->sr_state.sids = NULL;
2593                         }
2594                         srs->sr_state.numcsns = 0;
2595                 } else {
2596                         gotstate = 1;
2597                         /* If changed and doing Present lookup, send Present UUIDs */
2598                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT ) !=
2599                                 LDAP_SUCCESS ) {
2600                                 if ( ctxcsn )
2601                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2602                                 if ( sids )
2603                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2604                                 goto bailout;
2605                         }
2606                 }
2607         } else {
2608                 /* No consumer state, assume something has changed */
2609                 changed = SS_CHANGED;
2610         }
2611
2612 shortcut:
2613         /* Append CSN range to search filter, save original filter
2614          * for persistent search evaluation
2615          */
2616         if ( sop ) {
2617                 sop->s_filterstr= op->ors_filterstr;
2618         }
2619
2620         /* If something changed, find the changes */
2621         if ( gotstate && ( changed || dirty ) ) {
2622                 Filter *fand, *fava;
2623
2624                 fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2625                 fand->f_choice = LDAP_FILTER_AND;
2626                 fand->f_next = NULL;
2627                 fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2628                 fand->f_and = fava;
2629                 fava->f_choice = LDAP_FILTER_GE;
2630                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
2631                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
2632 #ifdef LDAP_COMP_MATCH
2633                 fava->f_ava->aa_cf = NULL;
2634 #endif
2635                 ber_dupbv_x( &fava->f_ava->aa_value, &mincsn, op->o_tmpmemctx );
2636                 fava->f_next = op->ors_filter;
2637                 if ( sop )
2638                         ldap_pvt_thread_mutex_lock( &sop->s_mutex );
2639                 op->ors_filter = fand;
2640                 filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
2641                 if ( sop ) {
2642                         sop->s_flags |= PS_FIX_FILTER;
2643                         ldap_pvt_thread_mutex_unlock( &sop->s_mutex );
2644                 }
2645         }
2646
2647         /* Let our callback add needed info to returned entries */
2648         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
2649         ss = (searchstate *)(cb+1);
2650         ss->ss_on = on;
2651         ss->ss_so = sop;
2652         ss->ss_flags = do_present | changed;
2653         ss->ss_ctxcsn = ctxcsn;
2654         ss->ss_numcsns = numcsns;
2655         ss->ss_sids = sids;
2656         cb->sc_response = syncprov_search_response;
2657         cb->sc_cleanup = syncprov_search_cleanup;
2658         cb->sc_private = ss;
2659         cb->sc_next = op->o_callback;
2660         op->o_callback = cb;
2661
2662         /* If this is a persistent search and no changes were reported during
2663          * the refresh phase, just invoke the response callback to transition
2664          * us into persist phase
2665          */
2666         if ( !changed && !dirty ) {
2667                 rs->sr_err = LDAP_SUCCESS;
2668                 rs->sr_nentries = 0;
2669                 send_ldap_result( op, rs );
2670                 return rs->sr_err;
2671         }
2672         return SLAP_CB_CONTINUE;
2673 }
2674
2675 static int
2676 syncprov_operational(
2677         Operation *op,
2678         SlapReply *rs )
2679 {
2680         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2681         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2682
2683         /* This prevents generating unnecessarily; frontend will strip
2684          * any statically stored copy.
2685          */
2686         if ( op->o_sync != SLAP_CONTROL_NONE )
2687                 return SLAP_CB_CONTINUE;
2688
2689         if ( rs->sr_entry &&
2690                 dn_match( &rs->sr_entry->e_nname, &si->si_contextdn )) {
2691
2692                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
2693                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
2694                         Attribute *a, **ap = NULL;
2695
2696                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
2697                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
2698                                         break;
2699                         }
2700
2701                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2702                         if ( si->si_ctxcsn ) {
2703                                 if ( !a ) {
2704                                         for ( ap = &rs->sr_operational_attrs; *ap;
2705                                                 ap=&(*ap)->a_next );
2706
2707                                         a = attr_alloc( slap_schema.si_ad_contextCSN );
2708                                         *ap = a;
2709                                 }
2710
2711                                 if ( !ap ) {
2712                                         if ( !(rs->sr_flags & REP_ENTRY_MODIFIABLE) ) {
2713                                                 Entry *e = entry_dup( rs->sr_entry );
2714                                                 if ( rs->sr_flags & REP_ENTRY_MUSTRELEASE ) {
2715                                                         overlay_entry_release_ov( op, rs->sr_entry, 0, on );
2716                                                         rs->sr_flags ^= REP_ENTRY_MUSTRELEASE;
2717                                                 } else if ( rs->sr_flags & REP_ENTRY_MUSTBEFREED ) {
2718                                                         entry_free( rs->sr_entry );
2719                                                 }
2720                                                 rs->sr_entry = e;
2721                                                 rs->sr_flags |=
2722                                                         REP_ENTRY_MODIFIABLE|REP_ENTRY_MUSTBEFREED;
2723                                                 a = attr_find( rs->sr_entry->e_attrs,
2724                                                         slap_schema.si_ad_contextCSN );
2725                                         }
2726                                         if ( a->a_nvals != a->a_vals ) {
2727                                                 ber_bvarray_free( a->a_nvals );
2728                                         }
2729                                         a->a_nvals = NULL;
2730                                         ber_bvarray_free( a->a_vals );
2731                                         a->a_vals = NULL;
2732                                         a->a_numvals = 0;
2733                                 }
2734                                 attr_valadd( a, si->si_ctxcsn, si->si_ctxcsn, si->si_numcsns );
2735                         }
2736                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2737                 }
2738         }
2739         return SLAP_CB_CONTINUE;
2740 }
2741
2742 enum {
2743         SP_CHKPT = 1,
2744         SP_SESSL,
2745         SP_NOPRES,
2746         SP_USEHINT
2747 };
2748
2749 static ConfigDriver sp_cf_gen;
2750
2751 static ConfigTable spcfg[] = {
2752         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2753                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2754                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2755                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2756         { "syncprov-sessionlog", "ops", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2757                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2758                         "DESC 'Session log size in ops' "
2759                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2760         { "syncprov-nopresent", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_NOPRES,
2761                 sp_cf_gen, "( OLcfgOvAt:1.3 NAME 'olcSpNoPresent' "
2762                         "DESC 'Omit Present phase processing' "
2763                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2764         { "syncprov-reloadhint", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_USEHINT,
2765                 sp_cf_gen, "( OLcfgOvAt:1.4 NAME 'olcSpReloadHint' "
2766                         "DESC 'Observe Reload Hint in Request control' "
2767                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2768         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2769 };
2770
2771 static ConfigOCs spocs[] = {
2772         { "( OLcfgOvOc:1.1 "
2773                 "NAME 'olcSyncProvConfig' "
2774                 "DESC 'SyncRepl Provider configuration' "
2775                 "SUP olcOverlayConfig "
2776                 "MAY ( olcSpCheckpoint "
2777                         "$ olcSpSessionlog "
2778                         "$ olcSpNoPresent "
2779                         "$ olcSpReloadHint "
2780                 ") )",
2781                         Cft_Overlay, spcfg },
2782         { NULL, 0, NULL }
2783 };
2784
2785 static int
2786 sp_cf_gen(ConfigArgs *c)
2787 {
2788         slap_overinst           *on = (slap_overinst *)c->bi;
2789         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2790         int rc = 0;
2791
2792         if ( c->op == SLAP_CONFIG_EMIT ) {
2793                 switch ( c->type ) {
2794                 case SP_CHKPT:
2795                         if ( si->si_chkops || si->si_chktime ) {
2796                                 struct berval bv;
2797                                 /* we assume si_chktime is a multiple of 60
2798                                  * because the parsed value was originally
2799                                  * multiplied by 60 */
2800                                 bv.bv_len = snprintf( c->cr_msg, sizeof( c->cr_msg ),
2801                                         "%d %d", si->si_chkops, si->si_chktime/60 );
2802                                 if ( bv.bv_len >= sizeof( c->cr_msg ) ) {
2803                                         rc = 1;
2804                                 } else {
2805                                         bv.bv_val = c->cr_msg;
2806                                         value_add_one( &c->rvalue_vals, &bv );
2807                                 }
2808                         } else {
2809                                 rc = 1;
2810                         }
2811                         break;
2812                 case SP_SESSL:
2813                         if ( si->si_logs ) {
2814                                 c->value_int = si->si_logs->sl_size;
2815                         } else {
2816                                 rc = 1;
2817                         }
2818                         break;
2819                 case SP_NOPRES:
2820                         if ( si->si_nopres ) {
2821                                 c->value_int = 1;
2822                         } else {
2823                                 rc = 1;
2824                         }
2825                         break;
2826                 case SP_USEHINT:
2827                         if ( si->si_usehint ) {
2828                                 c->value_int = 1;
2829                         } else {
2830                                 rc = 1;
2831                         }
2832                         break;
2833                 }
2834                 return rc;
2835         } else if ( c->op == LDAP_MOD_DELETE ) {
2836                 switch ( c->type ) {
2837                 case SP_CHKPT:
2838                         si->si_chkops = 0;
2839                         si->si_chktime = 0;
2840                         break;
2841                 case SP_SESSL:
2842                         if ( si->si_logs )
2843                                 si->si_logs->sl_size = 0;
2844                         else
2845                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2846                         break;
2847                 case SP_NOPRES:
2848                         if ( si->si_nopres )
2849                                 si->si_nopres = 0;
2850                         else
2851                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2852                         break;
2853                 case SP_USEHINT:
2854                         if ( si->si_usehint )
2855                                 si->si_usehint = 0;
2856                         else
2857                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2858                         break;
2859                 }
2860                 return rc;
2861         }
2862         switch ( c->type ) {
2863         case SP_CHKPT:
2864                 if ( lutil_atoi( &si->si_chkops, c->argv[1] ) != 0 ) {
2865                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint ops # \"%s\"",
2866                                 c->argv[0], c->argv[1] );
2867                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2868                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2869                         return ARG_BAD_CONF;
2870                 }
2871                 if ( si->si_chkops <= 0 ) {
2872                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint ops # \"%d\"",
2873                                 c->argv[0], si->si_chkops );
2874                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2875                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2876                         return ARG_BAD_CONF;
2877                 }
2878                 if ( lutil_atoi( &si->si_chktime, c->argv[2] ) != 0 ) {
2879                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint time \"%s\"",
2880                                 c->argv[0], c->argv[1] );
2881                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2882                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2883                         return ARG_BAD_CONF;
2884                 }
2885                 if ( si->si_chktime <= 0 ) {
2886                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint time \"%d\"",
2887                                 c->argv[0], si->si_chkops );
2888                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2889                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2890                         return ARG_BAD_CONF;
2891                 }
2892                 si->si_chktime *= 60;
2893                 break;
2894         case SP_SESSL: {
2895                 sessionlog *sl;
2896                 int size = c->value_int;
2897
2898                 if ( size < 0 ) {
2899                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s size %d is negative",
2900                                 c->argv[0], size );
2901                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2902                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2903                         return ARG_BAD_CONF;
2904                 }
2905                 sl = si->si_logs;
2906                 if ( !sl ) {
2907                         sl = ch_malloc( sizeof( sessionlog ) + LDAP_PVT_CSNSTR_BUFSIZE );
2908                         sl->sl_mincsn.bv_val = (char *)(sl+1);
2909                         sl->sl_mincsn.bv_len = 0;
2910                         sl->sl_num = 0;
2911                         sl->sl_head = sl->sl_tail = NULL;
2912                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
2913                         si->si_logs = sl;
2914                 }
2915                 sl->sl_size = size;
2916                 }
2917                 break;
2918         case SP_NOPRES:
2919                 si->si_nopres = c->value_int;
2920                 break;
2921         case SP_USEHINT:
2922                 si->si_usehint = c->value_int;
2923                 break;
2924         }
2925         return rc;
2926 }
2927
2928 /* ITS#3456 we cannot run this search on the main thread, must use a
2929  * child thread in order to insure we have a big enough stack.
2930  */
2931 static void *
2932 syncprov_db_otask(
2933         void *ptr
2934 )
2935 {
2936         syncprov_findcsn( ptr, FIND_MAXCSN );
2937         return NULL;
2938 }
2939
2940 /* Read any existing contextCSN from the underlying db.
2941  * Then search for any entries newer than that. If no value exists,
2942  * just generate it. Cache whatever result.
2943  */
2944 static int
2945 syncprov_db_open(
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         Connection conn = { 0 };
2954         OperationBuffer opbuf;
2955         Operation *op;
2956         Entry *e = NULL;
2957         Attribute *a;
2958         int rc;
2959         void *thrctx = NULL;
2960
2961         if ( !SLAP_LASTMOD( be )) {
2962                 Debug( LDAP_DEBUG_ANY,
2963                         "syncprov_db_open: invalid config, lastmod must be enabled\n", 0, 0, 0 );
2964                 return -1;
2965         }
2966
2967         if ( slapMode & SLAP_TOOL_MODE ) {
2968                 return 0;
2969         }
2970
2971         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
2972         if ( rc ) {
2973                 return rc;
2974         }
2975
2976         thrctx = ldap_pvt_thread_pool_context();
2977         connection_fake_init2( &conn, &opbuf, thrctx, 0 );
2978         op = &opbuf.ob_op;
2979         op->o_bd = be;
2980         op->o_dn = be->be_rootdn;
2981         op->o_ndn = be->be_rootndn;
2982
2983         if ( SLAP_SYNC_SUBENTRY( be )) {
2984                 build_new_dn( &si->si_contextdn, be->be_nsuffix,
2985                         (struct berval *)&slap_ldapsync_cn_bv, NULL );
2986         } else {
2987                 si->si_contextdn = be->be_nsuffix[0];
2988         }
2989         rc = overlay_entry_get_ov( op, &si->si_contextdn, NULL,
2990                 slap_schema.si_ad_contextCSN, 0, &e, on );
2991
2992         if ( e ) {
2993                 ldap_pvt_thread_t tid;
2994
2995                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
2996                 if ( a ) {
2997                         ber_bvarray_dup_x( &si->si_ctxcsn, a->a_vals, NULL );
2998                         si->si_numcsns = a->a_numvals;
2999                         si->si_sids = slap_parse_csn_sids( si->si_ctxcsn, a->a_numvals, NULL );
3000                 }
3001                 overlay_entry_release_ov( op, e, 0, on );
3002                 if ( si->si_ctxcsn && !SLAP_DBCLEAN( be )) {
3003                         op->o_req_dn = be->be_suffix[0];
3004                         op->o_req_ndn = be->be_nsuffix[0];
3005                         op->ors_scope = LDAP_SCOPE_SUBTREE;
3006                         ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
3007                         ldap_pvt_thread_join( tid, NULL );
3008                 }
3009         }
3010
3011         /* Didn't find a contextCSN, should we generate one? */
3012         if ( !si->si_ctxcsn ) {
3013                 char csnbuf[ LDAP_PVT_CSNSTR_BUFSIZE ];
3014                 struct berval csn;
3015
3016                 if ( SLAP_SYNC_SHADOW( op->o_bd )) {
3017                 /* If we're also a consumer, then don't generate anything.
3018                  * Wait for our provider to send it to us, or for a local
3019                  * modify if we have multimaster.
3020                  */
3021                         goto out;
3022                 }
3023                 csn.bv_val = csnbuf;
3024                 csn.bv_len = sizeof( csnbuf );
3025                 slap_get_csn( op, &csn, 0 );
3026                 value_add_one( &si->si_ctxcsn, &csn );
3027                 si->si_numcsns = 1;
3028                 si->si_sids = ch_malloc( sizeof(int) );
3029                 si->si_sids[0] = slap_serverID;
3030
3031                 /* make sure we do a checkpoint on close */
3032                 si->si_numops++;
3033         }
3034
3035 out:
3036         op->o_bd->bd_info = (BackendInfo *)on;
3037         return 0;
3038 }
3039
3040 /* Write the current contextCSN into the underlying db.
3041  */
3042 static int
3043 syncprov_db_close(
3044         BackendDB *be,
3045         ConfigReply *cr
3046 )
3047 {
3048     slap_overinst   *on = (slap_overinst *) be->bd_info;
3049     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3050
3051         if ( slapMode & SLAP_TOOL_MODE ) {
3052                 return 0;
3053         }
3054         if ( si->si_numops ) {
3055                 Connection conn = {0};
3056                 OperationBuffer opbuf;
3057                 Operation *op;
3058                 SlapReply rs = {REP_RESULT};
3059                 void *thrctx;
3060
3061                 thrctx = ldap_pvt_thread_pool_context();
3062                 connection_fake_init2( &conn, &opbuf, thrctx, 0 );
3063                 op = &opbuf.ob_op;
3064                 op->o_bd = be;
3065                 op->o_dn = be->be_rootdn;
3066                 op->o_ndn = be->be_rootndn;
3067                 syncprov_checkpoint( op, &rs, on );
3068         }
3069
3070     return 0;
3071 }
3072
3073 static int
3074 syncprov_db_init(
3075         BackendDB *be,
3076         ConfigReply *cr
3077 )
3078 {
3079         slap_overinst   *on = (slap_overinst *)be->bd_info;
3080         syncprov_info_t *si;
3081
3082         if ( SLAP_ISGLOBALOVERLAY( be ) ) {
3083                 Debug( LDAP_DEBUG_ANY,
3084                         "syncprov must be instantiated within a database.\n",
3085                         0, 0, 0 );
3086                 return 1;
3087         }
3088
3089         si = ch_calloc(1, sizeof(syncprov_info_t));
3090         on->on_bi.bi_private = si;
3091         ldap_pvt_thread_rdwr_init( &si->si_csn_rwlock );
3092         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
3093         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
3094         ldap_pvt_thread_mutex_init( &si->si_resp_mutex );
3095
3096         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
3097         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
3098         csn_anlist[1].an_desc = slap_schema.si_ad_entryUUID;
3099         csn_anlist[1].an_name = slap_schema.si_ad_entryUUID->ad_cname;
3100
3101         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
3102         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
3103
3104         return 0;
3105 }
3106
3107 static int
3108 syncprov_db_destroy(
3109         BackendDB *be,
3110         ConfigReply *cr
3111 )
3112 {
3113         slap_overinst   *on = (slap_overinst *)be->bd_info;
3114         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3115
3116         if ( si ) {
3117                 if ( si->si_logs ) {
3118                         slog_entry *se = si->si_logs->sl_head;
3119
3120                         while ( se ) {
3121                                 slog_entry *se_next = se->se_next;
3122                                 ch_free( se );
3123                                 se = se_next;
3124                         }
3125
3126                         ch_free( si->si_logs );
3127                 }
3128                 if ( si->si_ctxcsn )
3129                         ber_bvarray_free( si->si_ctxcsn );
3130                 if ( si->si_sids )
3131                         ch_free( si->si_sids );
3132                 ldap_pvt_thread_mutex_destroy( &si->si_resp_mutex );
3133                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
3134                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
3135                 ldap_pvt_thread_rdwr_destroy( &si->si_csn_rwlock );
3136                 ch_free( si );
3137         }
3138
3139         return 0;
3140 }
3141
3142 static int syncprov_parseCtrl (
3143         Operation *op,
3144         SlapReply *rs,
3145         LDAPControl *ctrl )
3146 {
3147         ber_tag_t tag;
3148         BerElementBuffer berbuf;
3149         BerElement *ber = (BerElement *)&berbuf;
3150         ber_int_t mode;
3151         ber_len_t len;
3152         struct berval cookie = BER_BVNULL;
3153         sync_control *sr;
3154         int rhint = 0;
3155
3156         if ( op->o_sync != SLAP_CONTROL_NONE ) {
3157                 rs->sr_text = "Sync control specified multiple times";
3158                 return LDAP_PROTOCOL_ERROR;
3159         }
3160
3161         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
3162                 rs->sr_text = "Sync control specified with pagedResults control";
3163                 return LDAP_PROTOCOL_ERROR;
3164         }
3165
3166         if ( BER_BVISNULL( &ctrl->ldctl_value ) ) {
3167                 rs->sr_text = "Sync control value is absent";
3168                 return LDAP_PROTOCOL_ERROR;
3169         }
3170
3171         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
3172                 rs->sr_text = "Sync control value is empty";
3173                 return LDAP_PROTOCOL_ERROR;
3174         }
3175
3176         /* Parse the control value
3177          *      syncRequestValue ::= SEQUENCE {
3178          *              mode   ENUMERATED {
3179          *                      -- 0 unused
3180          *                      refreshOnly             (1),
3181          *                      -- 2 reserved
3182          *                      refreshAndPersist       (3)
3183          *              },
3184          *              cookie  syncCookie OPTIONAL
3185          *      }
3186          */
3187
3188         ber_init2( ber, &ctrl->ldctl_value, 0 );
3189
3190         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
3191                 rs->sr_text = "Sync control : mode decoding error";
3192                 return LDAP_PROTOCOL_ERROR;
3193         }
3194
3195         switch( mode ) {
3196         case LDAP_SYNC_REFRESH_ONLY:
3197                 mode = SLAP_SYNC_REFRESH;
3198                 break;
3199         case LDAP_SYNC_REFRESH_AND_PERSIST:
3200                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
3201                 break;
3202         default:
3203                 rs->sr_text = "Sync control : unknown update mode";
3204                 return LDAP_PROTOCOL_ERROR;
3205         }
3206
3207         tag = ber_peek_tag( ber, &len );
3208
3209         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
3210                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
3211                         rs->sr_text = "Sync control : cookie decoding error";
3212                         return LDAP_PROTOCOL_ERROR;
3213                 }
3214                 tag = ber_peek_tag( ber, &len );
3215         }
3216         if ( tag == LDAP_TAG_RELOAD_HINT ) {
3217                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
3218                         rs->sr_text = "Sync control : rhint decoding error";
3219                         return LDAP_PROTOCOL_ERROR;
3220                 }
3221         }
3222         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
3223                         rs->sr_text = "Sync control : decoding error";
3224                         return LDAP_PROTOCOL_ERROR;
3225         }
3226         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
3227         sr->sr_rhint = rhint;
3228         if (!BER_BVISNULL(&cookie)) {
3229                 ber_dupbv_x( &sr->sr_state.octet_str, &cookie, op->o_tmpmemctx );
3230                 /* If parse fails, pretend no cookie was sent */
3231                 if ( slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx ) ||
3232                         sr->sr_state.rid == -1 ) {
3233                         if ( sr->sr_state.ctxcsn ) {
3234                                 ber_bvarray_free_x( sr->sr_state.ctxcsn, op->o_tmpmemctx );
3235                                 sr->sr_state.ctxcsn = NULL;
3236                         }
3237                         sr->sr_state.numcsns = 0;
3238                 }
3239         }
3240
3241         op->o_controls[slap_cids.sc_LDAPsync] = sr;
3242
3243         op->o_sync = ctrl->ldctl_iscritical
3244                 ? SLAP_CONTROL_CRITICAL
3245                 : SLAP_CONTROL_NONCRITICAL;
3246
3247         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
3248
3249         return LDAP_SUCCESS;
3250 }
3251
3252 /* This overlay is set up for dynamic loading via moduleload. For static
3253  * configuration, you'll need to arrange for the slap_overinst to be
3254  * initialized and registered by some other function inside slapd.
3255  */
3256
3257 static slap_overinst            syncprov;
3258
3259 int
3260 syncprov_initialize()
3261 {
3262         int rc;
3263
3264         rc = register_supported_control( LDAP_CONTROL_SYNC,
3265                 SLAP_CTRL_SEARCH, NULL,
3266                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
3267         if ( rc != LDAP_SUCCESS ) {
3268                 Debug( LDAP_DEBUG_ANY,
3269                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
3270                 return rc;
3271         }
3272
3273         syncprov.on_bi.bi_type = "syncprov";
3274         syncprov.on_bi.bi_db_init = syncprov_db_init;
3275         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
3276         syncprov.on_bi.bi_db_open = syncprov_db_open;
3277         syncprov.on_bi.bi_db_close = syncprov_db_close;
3278
3279         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
3280         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
3281
3282         syncprov.on_bi.bi_op_add = syncprov_op_mod;
3283         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
3284         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
3285         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
3286         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
3287         syncprov.on_bi.bi_op_search = syncprov_op_search;
3288         syncprov.on_bi.bi_extended = syncprov_op_extended;
3289         syncprov.on_bi.bi_operational = syncprov_operational;
3290
3291         syncprov.on_bi.bi_cf_ocs = spocs;
3292
3293         generic_filter.f_desc = slap_schema.si_ad_objectClass;
3294
3295         rc = config_register_schema( spcfg, spocs );
3296         if ( rc ) return rc;
3297
3298         return overlay_register( &syncprov );
3299 }
3300
3301 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
3302 int
3303 init_module( int argc, char *argv[] )
3304 {
3305         return syncprov_initialize();
3306 }
3307 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
3308
3309 #endif /* defined(SLAPD_OVER_SYNCPROV) */