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

   1 /* $OpenLDAP$ */
   2 /* syncprov.c - syncrepl provider */
   3 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   4  *
   5  * Copyright 2004-2009 The OpenLDAP Foundation.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted only as authorized by the OpenLDAP
  10  * Public License.
  11  *
  12  * A copy of this license is available in the file LICENSE in the
  13  * top-level directory of the distribution or, alternatively, at
  14  * <http://www.OpenLDAP.org/license.html>.
  15  */
  16 /* ACKNOWLEDGEMENTS:
  17  * This work was initially developed by Howard Chu for inclusion in
  18  * OpenLDAP Software.
  19  */
  20
  21 #include "portable.h"
  22
  23 #ifdef SLAPD_OVER_SYNCPROV
  24
  25 #include <ac/string.h>
  26 #include "lutil.h"
  27 #include "slap.h"
  28 #include "config.h"
  29 #include "ldap_rq.h"
  30
  31 #ifdef LDAP_DEVEL
  32 #define CHECK_CSN       1
  33 #endif
  34
  35 /* A modify request on a particular entry */
  36 typedef struct modinst {
  37         struct modinst *mi_next;
  38         Operation *mi_op;
  39 } modinst;
  40
  41 typedef struct modtarget {
  42         struct modinst *mt_mods;
  43         struct modinst *mt_tail;
  44         Operation *mt_op;
  45         ldap_pvt_thread_mutex_t mt_mutex;
  46 } modtarget;
  47
  48 /* A queued result of a persistent search */
  49 typedef struct syncres {
  50         struct syncres *s_next;
  51         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         time_t  si_chklast;     /* time of last checkpoint */
 137         Avlnode *si_mods;       /* entries being modified */
 138         sessionlog      *si_logs;
 139         ldap_pvt_thread_rdwr_t  si_csn_rwlock;
 140         ldap_pvt_thread_mutex_t si_ops_mutex;
 141         ldap_pvt_thread_mutex_t si_mods_mutex;
 142         ldap_pvt_thread_mutex_t si_resp_mutex;
 143 } syncprov_info_t;
 144
 145 typedef struct opcookie {
 146         slap_overinst *son;
 147         syncmatches *smatches;
 148         modtarget *smt;
 149         Entry *se;
 150         struct berval sdn;      /* DN of entry, for deletes */
 151         struct berval sndn;
 152         struct berval suuid;    /* UUID of entry */
 153         struct berval sctxcsn;
 154         short osid;     /* sid of op csn */
 155         short rsid;     /* sid of relay */
 156         short sreference;       /* Is the entry a reference? */
 157 } opcookie;
 158
 159 typedef struct mutexint {
 160         ldap_pvt_thread_mutex_t mi_mutex;
 161         int mi_int;
 162 } mutexint;
 163
 164 typedef struct fbase_cookie {
 165         struct berval *fdn;     /* DN of a modified entry, for scope testing */
 166         syncops *fss;   /* persistent search we're testing against */
 167         int fbase;      /* if TRUE we found the search base and it's still valid */
 168         int fscope;     /* if TRUE then fdn is within the psearch scope */
 169 } fbase_cookie;
 170
 171 static AttributeName csn_anlist[3];
 172 static AttributeName uuid_anlist[2];
 173
 174 /* Build a LDAPsync intermediate state control */
 175 static int
 176 syncprov_state_ctrl(
 177         Operation       *op,
 178         SlapReply       *rs,
 179         Entry           *e,
 180         int             entry_sync_state,
 181         LDAPControl     **ctrls,
 182         int             num_ctrls,
 183         int             send_cookie,
 184         struct berval   *cookie )
 185 {
 186         Attribute* a;
 187         int ret;
 188
 189         BerElementBuffer berbuf;
 190         BerElement *ber = (BerElement *)&berbuf;
 191
 192         struct berval   entryuuid_bv = BER_BVNULL;
 193
 194         ber_init2( ber, 0, LBER_USE_DER );
 195         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 196
 197         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 198
 199         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 200                 AttributeDescription *desc = a->a_desc;
 201                 if ( desc == slap_schema.si_ad_entryUUID ) {
 202                         entryuuid_bv = a->a_nvals[0];
 203                         break;
 204                 }
 205         }
 206
 207         /* FIXME: what if entryuuid is NULL or empty ? */
 208
 209         if ( send_cookie && cookie ) {
 210                 ber_printf( ber, "{eOON}",
 211                         entry_sync_state, &entryuuid_bv, cookie );
 212         } else {
 213                 ber_printf( ber, "{eON}",
 214                         entry_sync_state, &entryuuid_bv );
 215         }
 216
 217         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 218         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 219         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 220
 221         ber_free_buf( ber );
 222
 223         if ( ret < 0 ) {
 224                 Debug( LDAP_DEBUG_TRACE,
 225                         "slap_build_sync_ctrl: ber_flatten2 failed\n",
 226                         0, 0, 0 );
 227                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 228                 return ret;
 229         }
 230
 231         return LDAP_SUCCESS;
 232 }
 233
 234 /* Build a LDAPsync final state control */
 235 static int
 236 syncprov_done_ctrl(
 237         Operation       *op,
 238         SlapReply       *rs,
 239         LDAPControl     **ctrls,
 240         int                     num_ctrls,
 241         int                     send_cookie,
 242         struct berval *cookie,
 243         int                     refreshDeletes )
 244 {
 245         int ret;
 246         BerElementBuffer berbuf;
 247         BerElement *ber = (BerElement *)&berbuf;
 248
 249         ber_init2( ber, NULL, LBER_USE_DER );
 250         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 251
 252         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 253
 254         ber_printf( ber, "{" );
 255         if ( send_cookie && cookie ) {
 256                 ber_printf( ber, "O", cookie );
 257         }
 258         if ( refreshDeletes == LDAP_SYNC_REFRESH_DELETES ) {
 259                 ber_printf( ber, "b", refreshDeletes );
 260         }
 261         ber_printf( ber, "N}" );
 262
 263         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_DONE;
 264         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 265         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 266
 267         ber_free_buf( ber );
 268
 269         if ( ret < 0 ) {
 270                 Debug( LDAP_DEBUG_TRACE,
 271                         "syncprov_done_ctrl: ber_flatten2 failed\n",
 272                         0, 0, 0 );
 273                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 274                 return ret;
 275         }
 276
 277         return LDAP_SUCCESS;
 278 }
 279
 280 static int
 281 syncprov_sendinfo(
 282         Operation       *op,
 283         SlapReply       *rs,
 284         int                     type,
 285         struct berval *cookie,
 286         int                     refreshDone,
 287         BerVarray       syncUUIDs,
 288         int                     refreshDeletes )
 289 {
 290         BerElementBuffer berbuf;
 291         BerElement *ber = (BerElement *)&berbuf;
 292         struct berval rspdata;
 293
 294         int ret;
 295
 296         ber_init2( ber, NULL, LBER_USE_DER );
 297         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 298
 299         if ( type ) {
 300                 switch ( type ) {
 301                 case LDAP_TAG_SYNC_NEW_COOKIE:
 302                         ber_printf( ber, "tO", type, cookie );
 303                         break;
 304                 case LDAP_TAG_SYNC_REFRESH_DELETE:
 305                 case LDAP_TAG_SYNC_REFRESH_PRESENT:
 306                         ber_printf( ber, "t{", type );
 307                         if ( cookie ) {
 308                                 ber_printf( ber, "O", cookie );
 309                         }
 310                         if ( refreshDone == 0 ) {
 311                                 ber_printf( ber, "b", refreshDone );
 312                         }
 313                         ber_printf( ber, "N}" );
 314                         break;
 315                 case LDAP_TAG_SYNC_ID_SET:
 316                         ber_printf( ber, "t{", type );
 317                         if ( cookie ) {
 318                                 ber_printf( ber, "O", cookie );
 319                         }
 320                         if ( refreshDeletes == 1 ) {
 321                                 ber_printf( ber, "b", refreshDeletes );
 322                         }
 323                         ber_printf( ber, "[W]", syncUUIDs );
 324                         ber_printf( ber, "N}" );
 325                         break;
 326                 default:
 327                         Debug( LDAP_DEBUG_TRACE,
 328                                 "syncprov_sendinfo: invalid syncinfo type (%d)\n",
 329                                 type, 0, 0 );
 330                         return LDAP_OTHER;
 331                 }
 332         }
 333
 334         ret = ber_flatten2( ber, &rspdata, 0 );
 335
 336         if ( ret < 0 ) {
 337                 Debug( LDAP_DEBUG_TRACE,
 338                         "syncprov_sendinfo: ber_flatten2 failed\n",
 339                         0, 0, 0 );
 340                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 341                 return ret;
 342         }
 343
 344         rs->sr_rspoid = LDAP_SYNC_INFO;
 345         rs->sr_rspdata = &rspdata;
 346         send_ldap_intermediate( op, rs );
 347         rs->sr_rspdata = NULL;
 348         ber_free_buf( ber );
 349
 350         return LDAP_SUCCESS;
 351 }
 352
 353 /* Find a modtarget in an AVL tree */
 354 static int
 355 sp_avl_cmp( const void *c1, const void *c2 )
 356 {
 357         const modtarget *m1, *m2;
 358         int rc;
 359
 360         m1 = c1; m2 = c2;
 361         rc = m1->mt_op->o_req_ndn.bv_len - m2->mt_op->o_req_ndn.bv_len;
 362
 363         if ( rc ) return rc;
 364         return ber_bvcmp( &m1->mt_op->o_req_ndn, &m2->mt_op->o_req_ndn );
 365 }
 366
 367 /* syncprov_findbase:
 368  *   finds the true DN of the base of a search (with alias dereferencing) and
 369  * checks to make sure the base entry doesn't get replaced with a different
 370  * entry (e.g., swapping trees via ModDN, or retargeting an alias). If a
 371  * change is detected, any persistent search on this base must be terminated /
 372  * reloaded.
 373  *   On the first call, we just save the DN and entryID. On subsequent calls
 374  * we compare the DN and entryID with the saved values.
 375  */
 376 static int
 377 findbase_cb( Operation *op, SlapReply *rs )
 378 {
 379         slap_callback *sc = op->o_callback;
 380
 381         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 382                 fbase_cookie *fc = sc->sc_private;
 383
 384                 /* If no entryID, we're looking for the first time.
 385                  * Just store whatever we got.
 386                  */
 387                 if ( fc->fss->s_eid == NOID ) {
 388                         fc->fbase = 2;
 389                         fc->fss->s_eid = rs->sr_entry->e_id;
 390                         ber_dupbv( &fc->fss->s_base, &rs->sr_entry->e_nname );
 391
 392                 } else if ( rs->sr_entry->e_id == fc->fss->s_eid &&
 393                         dn_match( &rs->sr_entry->e_nname, &fc->fss->s_base )) {
 394
 395                 /* OK, the DN is the same and the entryID is the same. */
 396                         fc->fbase = 1;
 397                 }
 398         }
 399         if ( rs->sr_err != LDAP_SUCCESS ) {
 400                 Debug( LDAP_DEBUG_ANY, "findbase failed! %d\n", rs->sr_err,0,0 );
 401         }
 402         return LDAP_SUCCESS;
 403 }
 404
 405 static Filter generic_filter = { LDAP_FILTER_PRESENT, { 0 }, NULL };
 406 static struct berval generic_filterstr = BER_BVC("(objectclass=*)");
 407
 408 static int
 409 syncprov_findbase( Operation *op, fbase_cookie *fc )
 410 {
 411         /* Use basic parameters from syncrepl search, but use
 412          * current op's threadctx / tmpmemctx
 413          */
 414         ldap_pvt_thread_mutex_lock( &fc->fss->s_mutex );
 415         if ( fc->fss->s_flags & PS_FIND_BASE ) {
 416                 slap_callback cb = {0};
 417                 Operation fop;
 418                 SlapReply frs = { REP_RESULT };
 419                 int rc;
 420
 421                 fc->fss->s_flags ^= PS_FIND_BASE;
 422                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 423
 424                 fop = *fc->fss->s_op;
 425
 426                 fop.o_bd = fop.o_bd->bd_self;
 427                 fop.o_hdr = op->o_hdr;
 428                 fop.o_time = op->o_time;
 429                 fop.o_tincr = op->o_tincr;
 430
 431                 cb.sc_response = findbase_cb;
 432                 cb.sc_private = fc;
 433
 434                 fop.o_sync_mode = 0;    /* turn off sync mode */
 435                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 436                 fop.o_callback = &cb;
 437                 fop.o_tag = LDAP_REQ_SEARCH;
 438                 fop.ors_scope = LDAP_SCOPE_BASE;
 439                 fop.ors_limit = NULL;
 440                 fop.ors_slimit = 1;
 441                 fop.ors_tlimit = SLAP_NO_LIMIT;
 442                 fop.ors_attrs = slap_anlist_no_attrs;
 443                 fop.ors_attrsonly = 1;
 444                 fop.ors_filter = &generic_filter;
 445                 fop.ors_filterstr = generic_filterstr;
 446
 447                 rc = fop.o_bd->be_search( &fop, &frs );
 448         } else {
 449                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 450                 fc->fbase = 1;
 451         }
 452
 453         /* After the first call, see if the fdn resides in the scope */
 454         if ( fc->fbase == 1 ) {
 455                 switch ( fc->fss->s_op->ors_scope ) {
 456                 case LDAP_SCOPE_BASE:
 457                         fc->fscope = dn_match( fc->fdn, &fc->fss->s_base );
 458                         break;
 459                 case LDAP_SCOPE_ONELEVEL: {
 460                         struct berval pdn;
 461                         dnParent( fc->fdn, &pdn );
 462                         fc->fscope = dn_match( &pdn, &fc->fss->s_base );
 463                         break; }
 464                 case LDAP_SCOPE_SUBTREE:
 465                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base );
 466                         break;
 467                 case LDAP_SCOPE_SUBORDINATE:
 468                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base ) &&
 469                                 !dn_match( fc->fdn, &fc->fss->s_base );
 470                         break;
 471                 }
 472         }
 473
 474         if ( fc->fbase )
 475                 return LDAP_SUCCESS;
 476
 477         /* If entryID has changed, then the base of this search has
 478          * changed. Invalidate the psearch.
 479          */
 480         return LDAP_NO_SUCH_OBJECT;
 481 }
 482
 483 /* syncprov_findcsn:
 484  *   This function has three different purposes, but they all use a search
 485  * that filters on entryCSN so they're combined here.
 486  * 1: at startup time, after a contextCSN has been read from the database,
 487  * we search for all entries with CSN >= contextCSN in case the contextCSN
 488  * was not checkpointed at the previous shutdown.
 489  *
 490  * 2: when the current contextCSN is known and we have a sync cookie, we search
 491  * for one entry with CSN = the cookie CSN. If not found, try <= cookie CSN.
 492  * If an entry is found, the cookie CSN is valid, otherwise it is stale.
 493  *
 494  * 3: during a refresh phase, we search for all entries with CSN <= the cookie
 495  * CSN, and generate Present records for them. We always collect this result
 496  * in SyncID sets, even if there's only one match.
 497  */
 498 typedef enum find_csn_t {
 499         FIND_MAXCSN     = 1,
 500         FIND_CSN        = 2,
 501         FIND_PRESENT    = 3
 502 } find_csn_t;
 503
 504 static int
 505 findmax_cb( Operation *op, SlapReply *rs )
 506 {
 507         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 508                 struct berval *maxcsn = op->o_callback->sc_private;
 509                 Attribute *a = attr_find( rs->sr_entry->e_attrs,
 510                         slap_schema.si_ad_entryCSN );
 511
 512                 if ( a && ber_bvcmp( &a->a_vals[0], maxcsn ) > 0 &&
 513                         slap_parse_csn_sid( &a->a_vals[0] ) == slap_serverID ) {
 514                         maxcsn->bv_len = a->a_vals[0].bv_len;
 515                         strcpy( maxcsn->bv_val, a->a_vals[0].bv_val );
 516                 }
 517         }
 518         return LDAP_SUCCESS;
 519 }
 520
 521 static int
 522 findcsn_cb( Operation *op, SlapReply *rs )
 523 {
 524         slap_callback *sc = op->o_callback;
 525
 526         /* We just want to know that at least one exists, so it's OK if
 527          * we exceed the unchecked limit.
 528          */
 529         if ( rs->sr_err == LDAP_ADMINLIMIT_EXCEEDED ||
 530                 (rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS )) {
 531                 sc->sc_private = (void *)1;
 532         }
 533         return LDAP_SUCCESS;
 534 }
 535
 536 /* Build a list of entryUUIDs for sending in a SyncID set */
 537
 538 #define UUID_LEN        16
 539
 540 typedef struct fpres_cookie {
 541         int num;
 542         BerVarray uuids;
 543         char *last;
 544 } fpres_cookie;
 545
 546 static int
 547 findpres_cb( Operation *op, SlapReply *rs )
 548 {
 549         slap_callback *sc = op->o_callback;
 550         fpres_cookie *pc = sc->sc_private;
 551         Attribute *a;
 552         int ret = SLAP_CB_CONTINUE;
 553
 554         switch ( rs->sr_type ) {
 555         case REP_SEARCH:
 556                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryUUID );
 557                 if ( a ) {
 558                         pc->uuids[pc->num].bv_val = pc->last;
 559                         AC_MEMCPY( pc->uuids[pc->num].bv_val, a->a_nvals[0].bv_val,
 560                                 pc->uuids[pc->num].bv_len );
 561                         pc->num++;
 562                         pc->last = pc->uuids[pc->num].bv_val;
 563                         pc->uuids[pc->num].bv_val = NULL;
 564                 }
 565                 ret = LDAP_SUCCESS;
 566                 if ( pc->num != SLAP_SYNCUUID_SET_SIZE )
 567                         break;
 568                 /* FALLTHRU */
 569         case REP_RESULT:
 570                 ret = rs->sr_err;
 571                 if ( pc->num ) {
 572                         ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 573                                 0, pc->uuids, 0 );
 574                         pc->uuids[pc->num].bv_val = pc->last;
 575                         pc->num = 0;
 576                         pc->last = pc->uuids[0].bv_val;
 577                 }
 578                 break;
 579         default:
 580                 break;
 581         }
 582         return ret;
 583 }
 584
 585 static int
 586 syncprov_findcsn( Operation *op, find_csn_t mode )
 587 {
 588         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 589         syncprov_info_t         *si = on->on_bi.bi_private;
 590
 591         slap_callback cb = {0};
 592         Operation fop;
 593         SlapReply frs = { REP_RESULT };
 594         char buf[LDAP_PVT_CSNSTR_BUFSIZE + STRLENOF("(entryCSN<=)")];
 595         char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
 596         struct berval maxcsn;
 597         Filter cf;
 598         AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
 599         fpres_cookie pcookie;
 600         sync_control *srs = NULL;
 601         struct slap_limits_set fc_limits;
 602         int i, rc = LDAP_SUCCESS, findcsn_retry = 1;
 603         int maxid;
 604
 605         if ( mode != FIND_MAXCSN ) {
 606                 srs = op->o_controls[slap_cids.sc_LDAPsync];
 607         }
 608
 609         fop = *op;
 610         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync_mode */
 611         /* We want pure entries, not referrals */
 612         fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 613
 614         cf.f_ava = &eq;
 615         cf.f_av_desc = slap_schema.si_ad_entryCSN;
 616         BER_BVZERO( &cf.f_av_value );
 617         cf.f_next = NULL;
 618
 619         fop.o_callback = &cb;
 620         fop.ors_limit = NULL;
 621         fop.ors_tlimit = SLAP_NO_LIMIT;
 622         fop.ors_filter = &cf;
 623         fop.ors_filterstr.bv_val = buf;
 624
 625 again:
 626         switch( mode ) {
 627         case FIND_MAXCSN:
 628                 cf.f_choice = LDAP_FILTER_GE;
 629                 /* If there are multiple CSNs, use the one with our serverID */
 630                 for ( i=0; i<si->si_numcsns; i++) {
 631                         if ( slap_serverID == si->si_sids[i] ) {
 632                                 maxid = i;
 633                                 break;
 634                         }
 635                 }
 636                 if ( i == si->si_numcsns ) {
 637                         /* No match: this is multimaster, and none of the content in the DB
 638                          * originated locally. Treat like no CSN.
 639                          */
 640                         return LDAP_NO_SUCH_OBJECT;
 641                 }
 642                 cf.f_av_value = si->si_ctxcsn[maxid];
 643                 fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 644                         "(entryCSN>=%s)", cf.f_av_value.bv_val );
 645                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 646                         return LDAP_OTHER;
 647                 }
 648                 fop.ors_attrsonly = 0;
 649                 fop.ors_attrs = csn_anlist;
 650                 fop.ors_slimit = SLAP_NO_LIMIT;
 651                 cb.sc_private = &maxcsn;
 652                 cb.sc_response = findmax_cb;
 653                 strcpy( cbuf, cf.f_av_value.bv_val );
 654                 maxcsn.bv_val = cbuf;
 655                 maxcsn.bv_len = cf.f_av_value.bv_len;
 656                 break;
 657         case FIND_CSN:
 658                 if ( BER_BVISEMPTY( &cf.f_av_value )) {
 659                         cf.f_av_value = srs->sr_state.ctxcsn[0];
 660                         /* If there are multiple CSNs, use the smallest */
 661                         for ( i=1; i<srs->sr_state.numcsns; i++ ) {
 662                                 if ( ber_bvcmp( &cf.f_av_value, &srs->sr_state.ctxcsn[i] )
 663                                         > 0 ) {
 664                                         cf.f_av_value = srs->sr_state.ctxcsn[i];
 665                                 }
 666                         }
 667                 }
 668                 /* Look for exact match the first time */
 669                 if ( findcsn_retry ) {
 670                         cf.f_choice = LDAP_FILTER_EQUALITY;
 671                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 672                                 "(entryCSN=%s)", cf.f_av_value.bv_val );
 673                 /* On retry, look for <= */
 674                 } else {
 675                         cf.f_choice = LDAP_FILTER_LE;
 676                         fop.ors_limit = &fc_limits;
 677                         memset( &fc_limits, 0, sizeof( fc_limits ));
 678                         fc_limits.lms_s_unchecked = 1;
 679                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 680                                 "(entryCSN<=%s)", cf.f_av_value.bv_val );
 681                 }
 682                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 683                         return LDAP_OTHER;
 684                 }
 685                 fop.ors_attrsonly = 1;
 686                 fop.ors_attrs = slap_anlist_no_attrs;
 687                 fop.ors_slimit = 1;
 688                 cb.sc_private = NULL;
 689                 cb.sc_response = findcsn_cb;
 690                 break;
 691         case FIND_PRESENT:
 692                 fop.ors_filter = op->ors_filter;
 693                 fop.ors_filterstr = op->ors_filterstr;
 694                 fop.ors_attrsonly = 0;
 695                 fop.ors_attrs = uuid_anlist;
 696                 fop.ors_slimit = SLAP_NO_LIMIT;
 697                 cb.sc_private = &pcookie;
 698                 cb.sc_response = findpres_cb;
 699                 pcookie.num = 0;
 700
 701                 /* preallocate storage for a full set */
 702                 pcookie.uuids = op->o_tmpalloc( (SLAP_SYNCUUID_SET_SIZE+1) *
 703                         sizeof(struct berval) + SLAP_SYNCUUID_SET_SIZE * UUID_LEN,
 704                         op->o_tmpmemctx );
 705                 pcookie.last = (char *)(pcookie.uuids + SLAP_SYNCUUID_SET_SIZE+1);
 706                 pcookie.uuids[0].bv_val = pcookie.last;
 707                 pcookie.uuids[0].bv_len = UUID_LEN;
 708                 for (i=1; i<SLAP_SYNCUUID_SET_SIZE; i++) {
 709                         pcookie.uuids[i].bv_val = pcookie.uuids[i-1].bv_val + UUID_LEN;
 710                         pcookie.uuids[i].bv_len = UUID_LEN;
 711                 }
 712                 break;
 713         }
 714
 715         fop.o_bd->bd_info = (BackendInfo *)on->on_info;
 716         fop.o_bd->be_search( &fop, &frs );
 717         fop.o_bd->bd_info = (BackendInfo *)on;
 718
 719         switch( mode ) {
 720         case FIND_MAXCSN:
 721                 if ( ber_bvcmp( &si->si_ctxcsn[maxid], &maxcsn )) {
 722 #ifdef CHECK_CSN
 723                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
 724                         assert( !syn->ssyn_validate( syn, &maxcsn ));
 725 #endif
 726                         ber_bvreplace( &si->si_ctxcsn[maxid], &maxcsn );
 727                         si->si_numops++;        /* ensure a checkpoint */
 728                 }
 729                 break;
 730         case FIND_CSN:
 731                 /* If matching CSN was not found, invalidate the context. */
 732                 if ( !cb.sc_private ) {
 733                         /* If we didn't find an exact match, then try for <= */
 734                         if ( findcsn_retry ) {
 735                                 findcsn_retry = 0;
 736                                 goto again;
 737                         }
 738                         rc = LDAP_NO_SUCH_OBJECT;
 739                 }
 740                 break;
 741         case FIND_PRESENT:
 742                 op->o_tmpfree( pcookie.uuids, op->o_tmpmemctx );
 743                 break;
 744         }
 745
 746         return rc;
 747 }
 748
 749 /* Should find a place to cache these */
 750 static mutexint *get_mutexint()
 751 {
 752         mutexint *mi = ch_malloc( sizeof( mutexint ));
 753         ldap_pvt_thread_mutex_init( &mi->mi_mutex );
 754         mi->mi_int = 1;
 755         return mi;
 756 }
 757
 758 static void inc_mutexint( mutexint *mi )
 759 {
 760         ldap_pvt_thread_mutex_lock( &mi->mi_mutex );
 761         mi->mi_int++;
 762         ldap_pvt_thread_mutex_unlock( &mi->mi_mutex );
 763 }
 764
 765 /* return resulting counter */
 766 static int dec_mutexint( mutexint *mi )
 767 {
 768         int i;
 769         ldap_pvt_thread_mutex_lock( &mi->mi_mutex );
 770         i = --mi->mi_int;
 771         ldap_pvt_thread_mutex_unlock( &mi->mi_mutex );
 772         if ( !i ) {
 773                 ldap_pvt_thread_mutex_destroy( &mi->mi_mutex );
 774                 ch_free( mi );
 775         }
 776         return i;
 777 }
 778
 779 static void
 780 syncprov_free_syncop( syncops *so )
 781 {
 782         syncres *sr, *srnext;
 783         GroupAssertion *ga, *gnext;
 784
 785         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 786         if ( --so->s_inuse > 0 ) {
 787                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 788                 return;
 789         }
 790         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 791         if ( so->s_flags & PS_IS_DETACHED ) {
 792                 filter_free( so->s_op->ors_filter );
 793                 for ( ga = so->s_op->o_groups; ga; ga=gnext ) {
 794                         gnext = ga->ga_next;
 795                         ch_free( ga );
 796                 }
 797                 ch_free( so->s_op );
 798         }
 799         ch_free( so->s_base.bv_val );
 800         for ( sr=so->s_res; sr; sr=srnext ) {
 801                 srnext = sr->s_next;
 802                 if ( sr->s_e ) {
 803                         if ( !dec_mutexint( sr->s_e->e_private )) {
 804                                 sr->s_e->e_private = NULL;
 805                                 entry_free( sr->s_e );
 806                         }
 807                 }
 808                 ch_free( sr );
 809         }
 810         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 811         ch_free( so );
 812 }
 813
 814 /* Send a persistent search response */
 815 static int
 816 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so, int mode )
 817 {
 818         slap_overinst *on = opc->son;
 819
 820         SlapReply rs = { REP_SEARCH };
 821         LDAPControl *ctrls[2];
 822         struct berval cookie = BER_BVNULL, csns[2];
 823         Entry e_uuid = {0};
 824         Attribute a_uuid = {0};
 825
 826         if ( so->s_op->o_abandon )
 827                 return SLAPD_ABANDON;
 828
 829         ctrls[1] = NULL;
 830         if ( !BER_BVISNULL( &opc->sctxcsn )) {
 831                 csns[0] = opc->sctxcsn;
 832                 BER_BVZERO( &csns[1] );
 833                 slap_compose_sync_cookie( op, &cookie, csns, so->s_rid, slap_serverID ? slap_serverID : -1 );
 834         }
 835
 836 #ifdef LDAP_DEBUG
 837         if ( so->s_sid > 0 ) {
 838                 Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: to=%03x, cookie=%s\n",
 839                         so->s_sid, cookie.bv_val ? cookie.bv_val : "", 0 );
 840         } else {
 841                 Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: cookie=%s\n",
 842                         cookie.bv_val ? cookie.bv_val : "", 0, 0 );
 843         }
 844 #endif
 845
 846         e_uuid.e_attrs = &a_uuid;
 847         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 848         a_uuid.a_nvals = &opc->suuid;
 849         rs.sr_err = syncprov_state_ctrl( op, &rs, &e_uuid,
 850                 mode, ctrls, 0, 1, &cookie );
 851         if ( !BER_BVISNULL( &cookie )) {
 852                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
 853         }
 854
 855         rs.sr_ctrls = ctrls;
 856         switch( mode ) {
 857         case LDAP_SYNC_ADD:
 858                 rs.sr_entry = opc->se;
 859                 if ( opc->sreference && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 860                         rs.sr_ref = get_entry_referrals( op, rs.sr_entry );
 861                         rs.sr_err = send_search_reference( op, &rs );
 862                         ber_bvarray_free( rs.sr_ref );
 863                         break;
 864                 }
 865                 /* fallthru */
 866         case LDAP_SYNC_MODIFY:
 867                 rs.sr_entry = opc->se;
 868                 rs.sr_attrs = op->ors_attrs;
 869                 rs.sr_err = send_search_entry( op, &rs );
 870                 break;
 871         case LDAP_SYNC_DELETE:
 872                 e_uuid.e_attrs = NULL;
 873                 e_uuid.e_name = opc->sdn;
 874                 e_uuid.e_nname = opc->sndn;
 875                 rs.sr_entry = &e_uuid;
 876                 if ( opc->sreference && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 877                         struct berval bv = BER_BVNULL;
 878                         rs.sr_ref = &bv;
 879                         rs.sr_err = send_search_reference( op, &rs );
 880                 } else {
 881                         rs.sr_err = send_search_entry( op, &rs );
 882                 }
 883                 break;
 884         default:
 885                 assert(0);
 886         }
 887         /* In case someone else freed it already? */
 888         if ( rs.sr_ctrls ) {
 889                 int i;
 890                 for ( i=0; rs.sr_ctrls[i]; i++ ) {
 891                         if ( rs.sr_ctrls[i] == ctrls[0] ) {
 892                                 op->o_tmpfree( ctrls[0]->ldctl_value.bv_val, op->o_tmpmemctx );
 893                                 ctrls[0]->ldctl_value.bv_val = NULL;
 894                                 break;
 895                         }
 896                 }
 897                 rs.sr_ctrls = NULL;
 898         }
 899
 900         return rs.sr_err;
 901 }
 902
 903 static void
 904 syncprov_qstart( syncops *so );
 905
 906 /* Play back queued responses */
 907 static int
 908 syncprov_qplay( Operation *op, syncops *so )
 909 {
 910         slap_overinst *on = LDAP_SLIST_FIRST(&so->s_op->o_extra)->oe_key;
 911         syncres *sr;
 912         Entry *e;
 913         opcookie opc;
 914         int rc = 0;
 915
 916         opc.son = on;
 917
 918         do {
 919                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 920                 sr = so->s_res;
 921                 if ( sr )
 922                         so->s_res = sr->s_next;
 923                 if ( !so->s_res )
 924                         so->s_restail = NULL;
 925                 /* Exit loop with mutex held */
 926                 if ( !sr || so->s_op->o_abandon )
 927                         break;
 928                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 929
 930                 if ( sr->s_mode == LDAP_SYNC_NEW_COOKIE ) {
 931                     SlapReply rs = { REP_INTERMEDIATE };
 932
 933                     rc = syncprov_sendinfo( op, &rs, LDAP_TAG_SYNC_NEW_COOKIE,
 934                                 &sr->s_csn, 0, NULL, 0 );
 935                 } else {
 936                         opc.sdn = sr->s_dn;
 937                         opc.sndn = sr->s_ndn;
 938                         opc.suuid = sr->s_uuid;
 939                         opc.sctxcsn = sr->s_csn;
 940                         opc.sreference = sr->s_isreference;
 941                         opc.se = sr->s_e;
 942
 943                         rc = syncprov_sendresp( op, &opc, so, sr->s_mode );
 944
 945                         if ( opc.se ) {
 946                                 if ( !dec_mutexint( opc.se->e_private )) {
 947                                         opc.se->e_private = NULL;
 948                                         entry_free ( opc.se );
 949                                 }
 950                         }
 951                 }
 952
 953                 ch_free( sr );
 954
 955                 /* Exit loop with mutex held */
 956                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 957
 958         } while (0);
 959
 960         /* We now only send one change at a time, to prevent one
 961          * psearch from hogging all the CPU. Resubmit this task if
 962          * there are more responses queued and no errors occurred.
 963          */
 964
 965         if ( rc == 0 && so->s_res ) {
 966                 syncprov_qstart( so );
 967         } else {
 968                 so->s_flags ^= PS_TASK_QUEUED;
 969         }
 970
 971         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 972         return rc;
 973 }
 974
 975 /* task for playing back queued responses */
 976 static void *
 977 syncprov_qtask( void *ctx, void *arg )
 978 {
 979         syncops *so = arg;
 980         OperationBuffer opbuf;
 981         Operation *op;
 982         BackendDB be;
 983         int rc;
 984
 985         op = &opbuf.ob_op;
 986         *op = *so->s_op;
 987         op->o_hdr = &opbuf.ob_hdr;
 988         op->o_controls = opbuf.ob_controls;
 989         memset( op->o_controls, 0, sizeof(opbuf.ob_controls) );
 990
 991         *op->o_hdr = *so->s_op->o_hdr;
 992
 993         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx, 1);
 994         op->o_tmpmfuncs = &slap_sl_mfuncs;
 995         op->o_threadctx = ctx;
 996
 997         /* syncprov_qplay expects a fake db */
 998         be = *so->s_op->o_bd;
 999         be.be_flags |= SLAP_DBFLAG_OVERLAY;
1000         op->o_bd = &be;
1001         LDAP_SLIST_FIRST(&op->o_extra) = NULL;
1002         op->o_callback = NULL;
1003
1004         rc = syncprov_qplay( op, so );
1005
1006         /* decrement use count... */
1007         syncprov_free_syncop( so );
1008
1009         return NULL;
1010 }
1011
1012 /* Start the task to play back queued psearch responses */
1013 static void
1014 syncprov_qstart( syncops *so )
1015 {
1016         so->s_flags |= PS_TASK_QUEUED;
1017         so->s_inuse++;
1018         ldap_pvt_thread_pool_submit( &connection_pool,
1019                 syncprov_qtask, so );
1020 }
1021
1022 /* Queue a persistent search response */
1023 static int
1024 syncprov_qresp( opcookie *opc, syncops *so, int mode )
1025 {
1026         syncres *sr;
1027         int srsize;
1028         struct berval cookie = opc->sctxcsn;
1029
1030         if ( mode == LDAP_SYNC_NEW_COOKIE ) {
1031                 syncprov_info_t *si = opc->son->on_bi.bi_private;
1032
1033                 slap_compose_sync_cookie( NULL, &cookie, si->si_ctxcsn,
1034                         so->s_rid, slap_serverID ? slap_serverID : -1);
1035         }
1036
1037         srsize = sizeof(syncres) + opc->suuid.bv_len + 1 +
1038                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1;
1039         if ( cookie.bv_len )
1040                 srsize += cookie.bv_len + 1;
1041         sr = ch_malloc( srsize );
1042         sr->s_next = NULL;
1043         sr->s_e = opc->se;
1044         /* bump refcount on this entry */
1045         if ( opc->se )
1046                 inc_mutexint( opc->se->e_private );
1047         sr->s_dn.bv_val = (char *)(sr + 1);
1048         sr->s_dn.bv_len = opc->sdn.bv_len;
1049         sr->s_mode = mode;
1050         sr->s_isreference = opc->sreference;
1051         sr->s_ndn.bv_val = lutil_strcopy( sr->s_dn.bv_val,
1052                  opc->sdn.bv_val ) + 1;
1053         sr->s_ndn.bv_len = opc->sndn.bv_len;
1054         sr->s_uuid.bv_val = lutil_strcopy( sr->s_ndn.bv_val,
1055                  opc->sndn.bv_val ) + 1;
1056         sr->s_uuid.bv_len = opc->suuid.bv_len;
1057         AC_MEMCPY( sr->s_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1058         if ( cookie.bv_len ) {
1059                 sr->s_csn.bv_val = sr->s_uuid.bv_val + sr->s_uuid.bv_len + 1;
1060                 strcpy( sr->s_csn.bv_val, cookie.bv_val );
1061         } else {
1062                 sr->s_csn.bv_val = NULL;
1063         }
1064         sr->s_csn.bv_len = cookie.bv_len;
1065
1066         if ( mode == LDAP_SYNC_NEW_COOKIE && cookie.bv_val ) {
1067                 ch_free( cookie.bv_val );
1068         }
1069
1070         ldap_pvt_thread_mutex_lock( &so->s_mutex );
1071         if ( !so->s_res ) {
1072                 so->s_res = sr;
1073         } else {
1074                 so->s_restail->s_next = sr;
1075         }
1076         so->s_restail = sr;
1077
1078         /* If the base of the psearch was modified, check it next time round */
1079         if ( so->s_flags & PS_WROTE_BASE ) {
1080                 so->s_flags ^= PS_WROTE_BASE;
1081                 so->s_flags |= PS_FIND_BASE;
1082         }
1083         if (( so->s_flags & (PS_IS_DETACHED|PS_TASK_QUEUED)) == PS_IS_DETACHED ) {
1084                 syncprov_qstart( so );
1085         }
1086         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
1087         return LDAP_SUCCESS;
1088 }
1089
1090 static int
1091 syncprov_drop_psearch( syncops *so, int lock )
1092 {
1093         if ( so->s_flags & PS_IS_DETACHED ) {
1094                 if ( lock )
1095                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
1096                 so->s_op->o_conn->c_n_ops_executing--;
1097                 so->s_op->o_conn->c_n_ops_completed++;
1098                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, Operation,
1099                         o_next );
1100                 if ( lock )
1101                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
1102         }
1103         syncprov_free_syncop( so );
1104
1105         return 0;
1106 }
1107
1108 static int
1109 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
1110 {
1111         slap_callback *sc = op->o_callback;
1112         op->o_callback = sc->sc_next;
1113         syncprov_drop_psearch( op->o_callback->sc_private, 0 );
1114         op->o_tmpfree( sc, op->o_tmpmemctx );
1115         return 0;
1116 }
1117
1118 static int
1119 syncprov_op_abandon( Operation *op, SlapReply *rs )
1120 {
1121         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1122         syncprov_info_t         *si = on->on_bi.bi_private;
1123         syncops *so, *soprev;
1124
1125         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1126         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
1127                 soprev=so, so=so->s_next ) {
1128                 if ( so->s_op->o_connid == op->o_connid &&
1129                         so->s_op->o_msgid == op->orn_msgid ) {
1130                                 so->s_op->o_abandon = 1;
1131                                 soprev->s_next = so->s_next;
1132                                 break;
1133                 }
1134         }
1135         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1136         if ( so ) {
1137                 /* Is this really a Cancel exop? */
1138                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
1139                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
1140                         rs->sr_err = LDAP_CANCELLED;
1141                         send_ldap_result( so->s_op, rs );
1142                         if ( so->s_flags & PS_IS_DETACHED ) {
1143                                 slap_callback *cb;
1144                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
1145                                 cb->sc_cleanup = syncprov_ab_cleanup;
1146                                 cb->sc_next = op->o_callback;
1147                                 cb->sc_private = so;
1148                                 return SLAP_CB_CONTINUE;
1149                         }
1150                 }
1151                 syncprov_drop_psearch( so, 0 );
1152         }
1153         return SLAP_CB_CONTINUE;
1154 }
1155
1156 /* Find which persistent searches are affected by this operation */
1157 static void
1158 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
1159 {
1160         slap_overinst *on = opc->son;
1161         syncprov_info_t         *si = on->on_bi.bi_private;
1162
1163         fbase_cookie fc;
1164         syncops *ss, *sprev, *snext;
1165         Entry *e = NULL;
1166         Attribute *a;
1167         int rc;
1168         struct berval newdn;
1169         int freefdn = 0;
1170         BackendDB *b0 = op->o_bd, db;
1171
1172         fc.fdn = &op->o_req_ndn;
1173         /* compute new DN */
1174         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1175                 struct berval pdn;
1176                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
1177                 else dnParent( fc.fdn, &pdn );
1178                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
1179                 fc.fdn = &newdn;
1180                 freefdn = 1;
1181         }
1182         if ( op->o_tag != LDAP_REQ_ADD ) {
1183                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1184                         db = *op->o_bd;
1185                         op->o_bd = &db;
1186                 }
1187                 rc = overlay_entry_get_ov( op, fc.fdn, NULL, NULL, 0, &e, on );
1188                 /* If we're sending responses now, make a copy and unlock the DB */
1189                 if ( e && !saveit ) {
1190                         if ( !opc->se ) {
1191                                 opc->se = entry_dup( e );
1192                                 opc->se->e_private = get_mutexint();
1193                         }
1194                         overlay_entry_release_ov( op, e, 0, on );
1195                         e = opc->se;
1196                 }
1197                 if ( rc ) {
1198                         op->o_bd = b0;
1199                         return;
1200                 }
1201         } else {
1202                 e = op->ora_e;
1203                 if ( !saveit ) {
1204                         if ( !opc->se ) {
1205                                 opc->se = entry_dup( e );
1206                                 opc->se->e_private = get_mutexint();
1207                         }
1208                         e = opc->se;
1209                 }
1210         }
1211
1212         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1213                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1214                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1215                 opc->sreference = is_entry_referral( e );
1216                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1217                 if ( a )
1218                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1219         } else if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1220                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1221                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1222                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1223                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1224         }
1225
1226         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1227         for (ss = si->si_ops, sprev = (syncops *)&si->si_ops; ss;
1228                 sprev = ss, ss=snext)
1229         {
1230                 Operation op2;
1231                 Opheader oh;
1232                 syncmatches *sm;
1233                 int found = 0;
1234
1235                 snext = ss->s_next;
1236                 if ( ss->s_op->o_abandon )
1237                         continue;
1238
1239                 /* Don't send ops back to the originator */
1240                 if ( opc->osid > 0 && opc->osid == ss->s_sid ) {
1241                         Debug( LDAP_DEBUG_SYNC, "syncprov_matchops: skipping original sid %03x\n",
1242                                 opc->osid, 0, 0 );
1243                         continue;
1244                 }
1245
1246                 /* Don't send ops back to the messenger */
1247                 if ( opc->rsid > 0 && opc->rsid == ss->s_sid ) {
1248                         Debug( LDAP_DEBUG_SYNC, "syncprov_matchops: skipping relayed sid %03x\n",
1249                                 opc->rsid, 0, 0 );
1250                         continue;
1251                 }
1252
1253                 /* validate base */
1254                 fc.fss = ss;
1255                 fc.fbase = 0;
1256                 fc.fscope = 0;
1257
1258                 /* If the base of the search is missing, signal a refresh */
1259                 rc = syncprov_findbase( op, &fc );
1260                 if ( rc != LDAP_SUCCESS ) {
1261                         SlapReply rs = {REP_RESULT};
1262                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1263                                 "search base has changed" );
1264                         sprev->s_next = snext;
1265                         syncprov_drop_psearch( ss, 1 );
1266                         ss = sprev;
1267                         continue;
1268                 }
1269
1270                 /* If we're sending results now, look for this op in old matches */
1271                 if ( !saveit ) {
1272                         syncmatches *old;
1273
1274                         /* Did we modify the search base? */
1275                         if ( dn_match( &op->o_req_ndn, &ss->s_base )) {
1276                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1277                                 ss->s_flags |= PS_WROTE_BASE;
1278                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1279                         }
1280
1281                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1282                                 old=sm, sm=sm->sm_next ) {
1283                                 if ( sm->sm_op == ss ) {
1284                                         found = 1;
1285                                         old->sm_next = sm->sm_next;
1286                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1287                                         break;
1288                                 }
1289                         }
1290                 }
1291
1292                 if ( fc.fscope ) {
1293                         op2 = *ss->s_op;
1294                         oh = *op->o_hdr;
1295                         oh.oh_conn = ss->s_op->o_conn;
1296                         oh.oh_connid = ss->s_op->o_connid;
1297                         op2.o_bd = op->o_bd->bd_self;
1298                         op2.o_hdr = &oh;
1299                         op2.o_extra = op->o_extra;
1300                         op2.o_callback = NULL;
1301                         rc = test_filter( &op2, e, ss->s_op->ors_filter );
1302                 }
1303
1304                 Debug( LDAP_DEBUG_TRACE, "syncprov_matchops: sid %03x fscope %d rc %d\n",
1305                         ss->s_sid, fc.fscope, rc );
1306
1307                 /* check if current o_req_dn is in scope and matches filter */
1308                 if ( fc.fscope && rc == LDAP_COMPARE_TRUE ) {
1309                         if ( saveit ) {
1310                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1311                                 sm->sm_next = opc->smatches;
1312                                 sm->sm_op = ss;
1313                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1314                                 ++ss->s_inuse;
1315                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1316                                 opc->smatches = sm;
1317                         } else {
1318                                 /* if found send UPDATE else send ADD */
1319                                 syncprov_qresp( opc, ss,
1320                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD );
1321                         }
1322                 } else if ( !saveit && found ) {
1323                         /* send DELETE */
1324                         syncprov_qresp( opc, ss, LDAP_SYNC_DELETE );
1325                 } else if ( !saveit ) {
1326                         syncprov_qresp( opc, ss, LDAP_SYNC_NEW_COOKIE );
1327                 }
1328                 if ( !saveit && found ) {
1329                         /* Decrement s_inuse, was incremented when called
1330                          * with saveit == TRUE
1331                          */
1332                         syncprov_free_syncop( ss );
1333                 }
1334         }
1335         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1336
1337         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1338                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1339                         op->o_bd = &db;
1340                 }
1341                 if ( saveit )
1342                         overlay_entry_release_ov( op, e, 0, on );
1343                 op->o_bd = b0;
1344         }
1345         if ( opc->se && !saveit ) {
1346                 if ( !dec_mutexint( opc->se->e_private )) {
1347                         opc->se->e_private = NULL;
1348                         entry_free( opc->se );
1349                         opc->se = NULL;
1350                 }
1351         }
1352         if ( freefdn ) {
1353                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1354         }
1355         op->o_bd = b0;
1356 }
1357
1358 static int
1359 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1360 {
1361         slap_callback *cb = op->o_callback;
1362         opcookie *opc = cb->sc_private;
1363         slap_overinst *on = opc->son;
1364         syncprov_info_t         *si = on->on_bi.bi_private;
1365         syncmatches *sm, *snext;
1366         modtarget *mt, mtdummy;
1367
1368         for (sm = opc->smatches; sm; sm=snext) {
1369                 snext = sm->sm_next;
1370                 syncprov_free_syncop( sm->sm_op );
1371                 op->o_tmpfree( sm, op->o_tmpmemctx );
1372         }
1373
1374         /* Remove op from lock table */
1375         mt = opc->smt;
1376         if ( mt ) {
1377                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1378                 mt->mt_mods = mt->mt_mods->mi_next;
1379                 /* If there are more, promote the next one */
1380                 if ( mt->mt_mods ) {
1381                         mt->mt_op = mt->mt_mods->mi_op;
1382                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1383                 } else {
1384                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1385                         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1386                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1387                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1388                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1389                         ch_free( mt );
1390                 }
1391         }
1392         if ( !BER_BVISNULL( &opc->suuid ))
1393                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1394         if ( !BER_BVISNULL( &opc->sndn ))
1395                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1396         if ( !BER_BVISNULL( &opc->sdn ))
1397                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1398         op->o_callback = cb->sc_next;
1399         op->o_tmpfree(cb, op->o_tmpmemctx);
1400
1401         return 0;
1402 }
1403
1404 static void
1405 syncprov_checkpoint( Operation *op, SlapReply *rs, slap_overinst *on )
1406 {
1407         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
1408         Modifications mod;
1409         Operation opm;
1410         SlapReply rsm = { 0 };
1411         slap_callback cb = {0};
1412         BackendDB be;
1413
1414 #ifdef CHECK_CSN
1415         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1416
1417         int i;
1418         for ( i=0; i<si->si_numcsns; i++ ) {
1419                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1420         }
1421 #endif
1422         mod.sml_numvals = si->si_numcsns;
1423         mod.sml_values = si->si_ctxcsn;
1424         mod.sml_nvalues = NULL;
1425         mod.sml_desc = slap_schema.si_ad_contextCSN;
1426         mod.sml_op = LDAP_MOD_REPLACE;
1427         mod.sml_flags = SLAP_MOD_INTERNAL;
1428         mod.sml_next = NULL;
1429
1430         cb.sc_response = slap_null_cb;
1431         opm = *op;
1432         opm.o_tag = LDAP_REQ_MODIFY;
1433         opm.o_callback = &cb;
1434         opm.orm_modlist = &mod;
1435         opm.orm_no_opattrs = 1;
1436         if ( SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1437                 be = *on->on_info->oi_origdb;
1438                 opm.o_bd = &be;
1439         }
1440         opm.o_req_dn = si->si_contextdn;
1441         opm.o_req_ndn = si->si_contextdn;
1442         opm.o_bd->bd_info = on->on_info->oi_orig;
1443         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1444         opm.o_no_schema_check = 1;
1445         opm.o_bd->be_modify( &opm, &rsm );
1446
1447         if ( rsm.sr_err == LDAP_NO_SUCH_OBJECT &&
1448                 SLAP_SYNC_SUBENTRY( opm.o_bd )) {
1449                 const char      *text;
1450                 char txtbuf[SLAP_TEXT_BUFLEN];
1451                 size_t textlen = sizeof txtbuf;
1452                 Entry *e = slap_create_context_csn_entry( opm.o_bd, NULL );
1453                 slap_mods2entry( &mod, &e, 0, 1, &text, txtbuf, textlen);
1454                 opm.ora_e = e;
1455                 opm.o_bd->be_add( &opm, &rsm );
1456                 if ( e == opm.ora_e )
1457                         be_entry_release_w( &opm, opm.ora_e );
1458         }
1459
1460         if ( mod.sml_next != NULL ) {
1461                 slap_mods_free( mod.sml_next, 1 );
1462         }
1463 #ifdef CHECK_CSN
1464         for ( i=0; i<si->si_numcsns; i++ ) {
1465                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1466         }
1467 #endif
1468 }
1469
1470 static void
1471 syncprov_add_slog( Operation *op )
1472 {
1473         opcookie *opc = op->o_callback->sc_private;
1474         slap_overinst *on = opc->son;
1475         syncprov_info_t         *si = on->on_bi.bi_private;
1476         sessionlog *sl;
1477         slog_entry *se;
1478
1479         sl = si->si_logs;
1480         {
1481                 /* Allocate a record. UUIDs are not NUL-terminated. */
1482                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1483                         op->o_csn.bv_len + 1 );
1484                 se->se_next = NULL;
1485                 se->se_tag = op->o_tag;
1486
1487                 se->se_uuid.bv_val = (char *)(&se[1]);
1488                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1489                 se->se_uuid.bv_len = opc->suuid.bv_len;
1490
1491                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1492                 AC_MEMCPY( se->se_csn.bv_val, op->o_csn.bv_val, op->o_csn.bv_len );
1493                 se->se_csn.bv_val[op->o_csn.bv_len] = '\0';
1494                 se->se_csn.bv_len = op->o_csn.bv_len;
1495                 se->se_sid = slap_parse_csn_sid( &se->se_csn );
1496
1497                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1498                 if ( sl->sl_head ) {
1499                         sl->sl_tail->se_next = se;
1500                 } else {
1501                         sl->sl_head = se;
1502                 }
1503                 sl->sl_tail = se;
1504                 sl->sl_num++;
1505                 while ( sl->sl_num > sl->sl_size ) {
1506                         se = sl->sl_head;
1507                         sl->sl_head = se->se_next;
1508                         strcpy( sl->sl_mincsn.bv_val, se->se_csn.bv_val );
1509                         sl->sl_mincsn.bv_len = se->se_csn.bv_len;
1510                         ch_free( se );
1511                         sl->sl_num--;
1512                 }
1513                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1514         }
1515 }
1516
1517 /* Just set a flag if we found the matching entry */
1518 static int
1519 playlog_cb( Operation *op, SlapReply *rs )
1520 {
1521         if ( rs->sr_type == REP_SEARCH ) {
1522                 op->o_callback->sc_private = (void *)1;
1523         }
1524         return rs->sr_err;
1525 }
1526
1527 /* enter with sl->sl_mutex locked, release before returning */
1528 static void
1529 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1530         sync_control *srs, BerVarray ctxcsn, int numcsns, int *sids )
1531 {
1532         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1533         slog_entry *se;
1534         int i, j, ndel, num, nmods, mmods;
1535         char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
1536         BerVarray uuids;
1537         struct berval delcsn[2];
1538
1539         if ( !sl->sl_num ) {
1540                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1541                 return;
1542         }
1543
1544         num = sl->sl_num;
1545         i = 0;
1546         nmods = 0;
1547
1548         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1549                 num * UUID_LEN, op->o_tmpmemctx );
1550         uuids[0].bv_val = (char *)(uuids + num + 1);
1551
1552         delcsn[0].bv_len = 0;
1553         delcsn[0].bv_val = cbuf;
1554         BER_BVZERO(&delcsn[1]);
1555
1556         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1557          * and everything else at the end. Do this first so we can
1558          * unlock the list mutex.
1559          */
1560         Debug( LDAP_DEBUG_SYNC, "srs csn %s\n",
1561                 srs->sr_state.ctxcsn[0].bv_val, 0, 0 );
1562         for ( se=sl->sl_head; se; se=se->se_next ) {
1563                 int k;
1564                 Debug( LDAP_DEBUG_SYNC, "log csn %s\n", se->se_csn.bv_val, 0, 0 );
1565                 ndel = 1;
1566                 for ( k=0; k<srs->sr_state.numcsns; k++ ) {
1567                         if ( se->se_sid == srs->sr_state.sids[k] ) {
1568                                 ndel = ber_bvcmp( &se->se_csn, &srs->sr_state.ctxcsn[k] );
1569                                 break;
1570                         }
1571                 }
1572                 if ( ndel <= 0 ) {
1573                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too old\n", ndel, 0, 0 );
1574                         continue;
1575                 }
1576                 ndel = 0;
1577                 for ( k=0; k<numcsns; k++ ) {
1578                         if ( se->se_sid == sids[k] ) {
1579                                 ndel = ber_bvcmp( &se->se_csn, &ctxcsn[k] );
1580                                 break;
1581                         }
1582                 }
1583                 if ( ndel > 0 ) {
1584                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too new\n", ndel, 0, 0 );
1585                         break;
1586                 }
1587                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1588                         j = i;
1589                         i++;
1590                         AC_MEMCPY( cbuf, se->se_csn.bv_val, se->se_csn.bv_len );
1591                         delcsn[0].bv_len = se->se_csn.bv_len;
1592                         delcsn[0].bv_val[delcsn[0].bv_len] = '\0';
1593                 } else {
1594                         nmods++;
1595                         j = num - nmods;
1596                 }
1597                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1598                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1599                 uuids[j].bv_len = UUID_LEN;
1600         }
1601         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1602
1603         ndel = i;
1604
1605         /* Zero out unused slots */
1606         for ( i=ndel; i < num - nmods; i++ )
1607                 uuids[i].bv_len = 0;
1608
1609         /* Mods must be validated to see if they belong in this delete set.
1610          */
1611
1612         mmods = nmods;
1613         /* Strip any duplicates */
1614         for ( i=0; i<nmods; i++ ) {
1615                 for ( j=0; j<ndel; j++ ) {
1616                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1617                                 uuids[num - 1 - i].bv_len = 0;
1618                                 mmods --;
1619                                 break;
1620                         }
1621                 }
1622                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1623                 for ( j=0; j<i; j++ ) {
1624                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1625                                 uuids[num - 1 - i].bv_len = 0;
1626                                 mmods --;
1627                                 break;
1628                         }
1629                 }
1630         }
1631
1632         if ( mmods ) {
1633                 Operation fop;
1634                 SlapReply frs = { REP_RESULT };
1635                 int rc;
1636                 Filter mf, af;
1637                 AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
1638                 slap_callback cb = {0};
1639
1640                 fop = *op;
1641
1642                 fop.o_sync_mode = 0;
1643                 fop.o_callback = &cb;
1644                 fop.ors_limit = NULL;
1645                 fop.ors_tlimit = SLAP_NO_LIMIT;
1646                 fop.ors_attrs = slap_anlist_all_attributes;
1647                 fop.ors_attrsonly = 0;
1648                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1649
1650                 af.f_choice = LDAP_FILTER_AND;
1651                 af.f_next = NULL;
1652                 af.f_and = &mf;
1653                 mf.f_choice = LDAP_FILTER_EQUALITY;
1654                 mf.f_ava = &eq;
1655                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1656                 mf.f_next = fop.ors_filter;
1657
1658                 fop.ors_filter = &af;
1659
1660                 cb.sc_response = playlog_cb;
1661                 fop.o_bd->bd_info = (BackendInfo *)on->on_info;
1662
1663                 for ( i=ndel; i<num; i++ ) {
1664                         if ( uuids[i].bv_len == 0 ) continue;
1665
1666                         mf.f_av_value = uuids[i];
1667                         cb.sc_private = NULL;
1668                         fop.ors_slimit = 1;
1669                         frs.sr_nentries = 0;
1670                         rc = fop.o_bd->be_search( &fop, &frs );
1671
1672                         /* If entry was not found, add to delete list */
1673                         if ( !cb.sc_private ) {
1674                                 uuids[ndel++] = uuids[i];
1675                         }
1676                 }
1677                 fop.o_bd->bd_info = (BackendInfo *)on;
1678         }
1679         if ( ndel ) {
1680                 struct berval cookie;
1681
1682                 if ( delcsn[0].bv_len ) {
1683                         slap_compose_sync_cookie( op, &cookie, delcsn, srs->sr_state.rid,
1684                                 slap_serverID ? slap_serverID : -1 );
1685
1686                         Debug( LDAP_DEBUG_SYNC, "syncprov_playlog: cookie=%s\n", cookie.bv_val, 0, 0 );
1687                 }
1688
1689                 uuids[ndel].bv_val = NULL;
1690                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET,
1691                         delcsn[0].bv_len ? &cookie : NULL, 0, uuids, 1 );
1692                 if ( delcsn[0].bv_len ) {
1693                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1694                 }
1695         }
1696         op->o_tmpfree( uuids, op->o_tmpmemctx );
1697 }
1698
1699 static int
1700 syncprov_op_response( Operation *op, SlapReply *rs )
1701 {
1702         opcookie *opc = op->o_callback->sc_private;
1703         slap_overinst *on = opc->son;
1704         syncprov_info_t         *si = on->on_bi.bi_private;
1705         syncmatches *sm;
1706
1707         if ( rs->sr_err == LDAP_SUCCESS )
1708         {
1709                 struct berval maxcsn;
1710                 char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
1711                 int do_check = 0, have_psearches, foundit, csn_changed = 0;
1712
1713                 ldap_pvt_thread_mutex_lock( &si->si_resp_mutex );
1714
1715                 /* Update our context CSN */
1716                 cbuf[0] = '\0';
1717                 maxcsn.bv_val = cbuf;
1718                 maxcsn.bv_len = sizeof(cbuf);
1719                 ldap_pvt_thread_rdwr_wlock( &si->si_csn_rwlock );
1720
1721                 slap_get_commit_csn( op, &maxcsn, &foundit );
1722                 if ( BER_BVISEMPTY( &maxcsn ) && SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1723                         /* syncrepl queues the CSN values in the db where
1724                          * it is configured , not where the changes are made.
1725                          * So look for a value in the glue db if we didn't
1726                          * find any in this db.
1727                          */
1728                         BackendDB *be = op->o_bd;
1729                         op->o_bd = select_backend( &be->be_nsuffix[0], 1);
1730                         maxcsn.bv_val = cbuf;
1731                         maxcsn.bv_len = sizeof(cbuf);
1732                         slap_get_commit_csn( op, &maxcsn, &foundit );
1733                         op->o_bd = be;
1734                 }
1735                 if ( !BER_BVISEMPTY( &maxcsn ) ) {
1736                         int i, sid;
1737 #ifdef CHECK_CSN
1738                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1739                         assert( !syn->ssyn_validate( syn, &maxcsn ));
1740 #endif
1741                         sid = slap_parse_csn_sid( &maxcsn );
1742                         for ( i=0; i<si->si_numcsns; i++ ) {
1743                                 if ( sid == si->si_sids[i] ) {
1744                                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn[i] ) > 0 ) {
1745                                                 ber_bvreplace( &si->si_ctxcsn[i], &maxcsn );
1746                                                 csn_changed = 1;
1747                                         }
1748                                         break;
1749                                 }
1750                         }
1751                         /* It's a new SID for us */
1752                         if ( i == si->si_numcsns ) {
1753                                 value_add_one( &si->si_ctxcsn, &maxcsn );
1754                                 csn_changed = 1;
1755                                 si->si_numcsns++;
1756                                 si->si_sids = ch_realloc( si->si_sids, si->si_numcsns *
1757                                         sizeof(int));
1758                                 si->si_sids[i] = sid;
1759                         }
1760                 }
1761
1762                 /* Don't do any processing for consumer contextCSN updates */
1763                 if ( op->o_dont_replicate ) {
1764                         if ( op->o_tag == LDAP_REQ_MODIFY &&
1765                                 op->orm_modlist->sml_op == LDAP_MOD_REPLACE &&
1766                                 op->orm_modlist->sml_desc == slap_schema.si_ad_contextCSN ) {
1767                         /* Catch contextCSN updates from syncrepl. We have to look at
1768                          * all the attribute values, as there may be more than one csn
1769                          * that changed, and only one can be passed in the csn queue.
1770                          */
1771                         Modifications *mod = op->orm_modlist;
1772                         int i, j, sid;
1773
1774                         for ( i=0; i<mod->sml_numvals; i++ ) {
1775                                 sid = slap_parse_csn_sid( &mod->sml_values[i] );
1776                                 for ( j=0; j<si->si_numcsns; j++ ) {
1777                                         if ( sid == si->si_sids[j] ) {
1778                                                 if ( ber_bvcmp( &mod->sml_values[i], &si->si_ctxcsn[j] ) > 0 ) {
1779                                                         ber_bvreplace( &si->si_ctxcsn[j], &mod->sml_values[i] );
1780                                                         csn_changed = 1;
1781                                                 }
1782                                                 break;
1783                                         }
1784                                 }
1785
1786                                 if ( j == si->si_numcsns ) {
1787                                         value_add_one( &si->si_ctxcsn, &mod->sml_values[i] );
1788                                         si->si_numcsns++;
1789                                         si->si_sids = ch_realloc( si->si_sids, si->si_numcsns *
1790                                                 sizeof(int));
1791                                         si->si_sids[j] = sid;
1792                                         csn_changed = 1;
1793                                 }
1794                         }
1795                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1796
1797                         if ( csn_changed ) {
1798                                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1799                                 have_psearches = ( si->si_ops != NULL );
1800                                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1801
1802                                 if ( have_psearches ) {
1803                                         for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1804                                                 if ( sm->sm_op->s_op->o_abandon )
1805                                                         continue;
1806                                                 syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_NEW_COOKIE );
1807                                         }
1808                                 }
1809                         }
1810                         } else {
1811                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1812                         }
1813                         goto leave;
1814                 }
1815
1816                 si->si_numops++;
1817                 if ( si->si_chkops || si->si_chktime ) {
1818                         /* Never checkpoint adding the context entry,
1819                          * it will deadlock
1820                          */
1821                         if ( op->o_tag != LDAP_REQ_ADD ||
1822                                 !dn_match( &op->o_req_ndn, &si->si_contextdn )) {
1823                                 if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1824                                         do_check = 1;
1825                                         si->si_numops = 0;
1826                                 }
1827                                 if ( si->si_chktime &&
1828                                         (op->o_time - si->si_chklast >= si->si_chktime )) {
1829                                         if ( si->si_chklast ) {
1830                                                 do_check = 1;
1831                                                 si->si_chklast = op->o_time;
1832                                         } else {
1833                                                 si->si_chklast = 1;
1834                                         }
1835                                 }
1836                         }
1837                 }
1838                 ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1839
1840                 if ( do_check ) {
1841                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1842                         syncprov_checkpoint( op, rs, on );
1843                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1844                 }
1845
1846                 /* only update consumer ctx if this is a newer csn */
1847                 if ( csn_changed ) {
1848                         opc->sctxcsn = maxcsn;
1849                 }
1850
1851                 /* Handle any persistent searches */
1852                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1853                 have_psearches = ( si->si_ops != NULL );
1854                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1855                 if ( have_psearches ) {
1856                         switch(op->o_tag) {
1857                         case LDAP_REQ_ADD:
1858                         case LDAP_REQ_MODIFY:
1859                         case LDAP_REQ_MODRDN:
1860                         case LDAP_REQ_EXTENDED:
1861                                 syncprov_matchops( op, opc, 0 );
1862                                 break;
1863                         case LDAP_REQ_DELETE:
1864                                 /* for each match in opc->smatches:
1865                                  *   send DELETE msg
1866                                  */
1867                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1868                                         if ( sm->sm_op->s_op->o_abandon )
1869                                                 continue;
1870                                         syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_DELETE );
1871                                 }
1872                                 break;
1873                         }
1874                 }
1875
1876                 /* Add any log records */
1877                 if ( si->si_logs && op->o_tag != LDAP_REQ_ADD ) {
1878                         syncprov_add_slog( op );
1879                 }
1880 leave:          ldap_pvt_thread_mutex_unlock( &si->si_resp_mutex );
1881         }
1882         return SLAP_CB_CONTINUE;
1883 }
1884
1885 /* We don't use a subentry to store the context CSN any more.
1886  * We expose the current context CSN as an operational attribute
1887  * of the suffix entry.
1888  */
1889 static int
1890 syncprov_op_compare( Operation *op, SlapReply *rs )
1891 {
1892         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1893         syncprov_info_t         *si = on->on_bi.bi_private;
1894         int rc = SLAP_CB_CONTINUE;
1895
1896         if ( dn_match( &op->o_req_ndn, &si->si_contextdn ) &&
1897                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1898         {
1899                 Entry e = {0};
1900                 Attribute a = {0};
1901
1902                 e.e_name = si->si_contextdn;
1903                 e.e_nname = si->si_contextdn;
1904                 e.e_attrs = &a;
1905
1906                 a.a_desc = slap_schema.si_ad_contextCSN;
1907
1908                 ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1909
1910                 a.a_vals = si->si_ctxcsn;
1911                 a.a_nvals = a.a_vals;
1912                 a.a_numvals = si->si_numcsns;
1913
1914                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1915                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1916                 if ( ! rs->sr_err ) {
1917                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1918                         goto return_results;
1919                 }
1920
1921                 if ( get_assert( op ) &&
1922                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
1923                 {
1924                         rs->sr_err = LDAP_ASSERTION_FAILED;
1925                         goto return_results;
1926                 }
1927
1928
1929                 rs->sr_err = LDAP_COMPARE_FALSE;
1930
1931                 if ( attr_valfind( &a,
1932                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
1933                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
1934                                 &op->oq_compare.rs_ava->aa_value, NULL, op->o_tmpmemctx ) == 0 )
1935                 {
1936                         rs->sr_err = LDAP_COMPARE_TRUE;
1937                 }
1938
1939 return_results:;
1940
1941                 ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1942
1943                 send_ldap_result( op, rs );
1944
1945                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
1946                         rs->sr_err = LDAP_SUCCESS;
1947                 }
1948                 rc = rs->sr_err;
1949         }
1950
1951         return rc;
1952 }
1953
1954 static int
1955 syncprov_op_mod( Operation *op, SlapReply *rs )
1956 {
1957         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1958         syncprov_info_t         *si = on->on_bi.bi_private;
1959         slap_callback *cb;
1960         opcookie *opc;
1961         int have_psearches, cbsize;
1962
1963         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1964         have_psearches = ( si->si_ops != NULL );
1965         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1966
1967         cbsize = sizeof(slap_callback) + sizeof(opcookie) +
1968                 (have_psearches ? sizeof(modinst) : 0 );
1969
1970         cb = op->o_tmpcalloc(1, cbsize, op->o_tmpmemctx);
1971         opc = (opcookie *)(cb+1);
1972         opc->son = on;
1973         cb->sc_response = syncprov_op_response;
1974         cb->sc_cleanup = syncprov_op_cleanup;
1975         cb->sc_private = opc;
1976         cb->sc_next = op->o_callback;
1977         op->o_callback = cb;
1978
1979         opc->osid = -1;
1980         opc->rsid = -1;
1981         if ( op->o_csn.bv_val ) {
1982                 opc->osid = slap_parse_csn_sid( &op->o_csn );
1983         }
1984         if ( op->o_controls ) {
1985                 struct sync_cookie *scook =
1986                 op->o_controls[slap_cids.sc_LDAPsync];
1987                 if ( scook )
1988                         opc->rsid = scook->sid;
1989         }
1990
1991         /* If there are active persistent searches, lock this operation.
1992          * See seqmod.c for the locking logic on its own.
1993          */
1994         if ( have_psearches ) {
1995                 modtarget *mt, mtdummy;
1996                 modinst *mi;
1997
1998                 mi = (modinst *)(opc+1);
1999                 mi->mi_op = op;
2000
2001                 /* See if we're already modifying this entry... */
2002                 mtdummy.mt_op = op;
2003                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
2004                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
2005                 if ( mt ) {
2006                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
2007                         if ( mt->mt_mods == NULL ) {
2008                                 /* Cannot reuse this mt, as another thread is about
2009                                  * to release it in syncprov_op_cleanup.
2010                                  */
2011                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2012                                 mt = NULL;
2013                         }
2014                 }
2015                 if ( mt ) {
2016                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
2017                         mt->mt_tail->mi_next = mi;
2018                         mt->mt_tail = mi;
2019                         /* wait for this op to get to head of list */
2020                         while ( mt->mt_mods != mi ) {
2021                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2022                                 /* FIXME: if dynamic config can delete overlays or
2023                                  * databases we'll have to check for cleanup here.
2024                                  * Currently it's not an issue because there are
2025                                  * no dynamic config deletes...
2026                                  */
2027                                 if ( slapd_shutdown )
2028                                         return SLAPD_ABANDON;
2029
2030                                 if ( !ldap_pvt_thread_pool_pausecheck( &connection_pool ))
2031                                         ldap_pvt_thread_yield();
2032                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
2033
2034                                 /* clean up if the caller is giving up */
2035                                 if ( op->o_abandon ) {
2036                                         modinst *m2;
2037                                         for ( m2 = mt->mt_mods; m2->mi_next != mi;
2038                                                 m2 = m2->mi_next );
2039                                         m2->mi_next = mi->mi_next;
2040                                         if ( mt->mt_tail == mi ) mt->mt_tail = m2;
2041                                         op->o_tmpfree( cb, op->o_tmpmemctx );
2042                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2043                                         return SLAPD_ABANDON;
2044                                 }
2045                         }
2046                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2047                 } else {
2048                         /* Record that we're modifying this entry now */
2049                         mt = ch_malloc( sizeof(modtarget) );
2050                         mt->mt_mods = mi;
2051                         mt->mt_tail = mi;
2052                         mt->mt_op = mi->mi_op;
2053                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
2054                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
2055                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
2056                 }
2057                 opc->smt = mt;
2058         }
2059
2060         if (( have_psearches || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
2061                 syncprov_matchops( op, opc, 1 );
2062
2063         return SLAP_CB_CONTINUE;
2064 }
2065
2066 static int
2067 syncprov_op_extended( Operation *op, SlapReply *rs )
2068 {
2069         if ( exop_is_write( op ))
2070                 return syncprov_op_mod( op, rs );
2071
2072         return SLAP_CB_CONTINUE;
2073 }
2074
2075 typedef struct searchstate {
2076         slap_overinst *ss_on;
2077         syncops *ss_so;
2078         BerVarray ss_ctxcsn;
2079         int *ss_sids;
2080         int ss_numcsns;
2081 #define SS_PRESENT      0x01
2082 #define SS_CHANGED      0x02
2083         int ss_flags;
2084 } searchstate;
2085
2086 static int
2087 syncprov_search_cleanup( Operation *op, SlapReply *rs )
2088 {
2089         if ( rs->sr_ctrls ) {
2090                 op->o_tmpfree( rs->sr_ctrls[0], op->o_tmpmemctx );
2091                 op->o_tmpfree( rs->sr_ctrls, op->o_tmpmemctx );
2092                 rs->sr_ctrls = NULL;
2093         }
2094         return 0;
2095 }
2096
2097 typedef struct SyncOperationBuffer {
2098         Operation               sob_op;
2099         Opheader                sob_hdr;
2100         OpExtra                 sob_oe;
2101         AttributeName   sob_extra;      /* not always present */
2102         /* Further data allocated here */
2103 } SyncOperationBuffer;
2104
2105 static void
2106 syncprov_detach_op( Operation *op, syncops *so, slap_overinst *on )
2107 {
2108         SyncOperationBuffer *sopbuf2;
2109         Operation *op2;
2110         int i, alen = 0;
2111         size_t size;
2112         char *ptr;
2113         GroupAssertion *g1, *g2;
2114
2115         /* count the search attrs */
2116         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2117                 alen += op->ors_attrs[i].an_name.bv_len + 1;
2118         }
2119         /* Make a new copy of the operation */
2120         size = offsetof( SyncOperationBuffer, sob_extra ) +
2121                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
2122                 op->o_req_dn.bv_len + 1 +
2123                 op->o_req_ndn.bv_len + 1 +
2124                 op->o_ndn.bv_len + 1 +
2125                 so->s_filterstr.bv_len + 1;
2126         sopbuf2 = ch_calloc( 1, size );
2127         op2 = &sopbuf2->sob_op;
2128         op2->o_hdr = &sopbuf2->sob_hdr;
2129         LDAP_SLIST_FIRST(&op2->o_extra) = &sopbuf2->sob_oe;
2130
2131         /* Copy the fields we care about explicitly, leave the rest alone */
2132         *op2->o_hdr = *op->o_hdr;
2133         op2->o_tag = op->o_tag;
2134         op2->o_time = op->o_time;
2135         op2->o_bd = on->on_info->oi_origdb;
2136         op2->o_request = op->o_request;
2137         op2->o_managedsait = op->o_managedsait;
2138         LDAP_SLIST_FIRST(&op2->o_extra)->oe_key = on;
2139         LDAP_SLIST_NEXT(LDAP_SLIST_FIRST(&op2->o_extra), oe_next) = NULL;
2140
2141         ptr = (char *) sopbuf2 + offsetof( SyncOperationBuffer, sob_extra );
2142         if ( i ) {
2143                 op2->ors_attrs = (AttributeName *) ptr;
2144                 ptr = (char *) &op2->ors_attrs[i+1];
2145                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2146                         op2->ors_attrs[i] = op->ors_attrs[i];
2147                         op2->ors_attrs[i].an_name.bv_val = ptr;
2148                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
2149                 }
2150                 BER_BVZERO( &op2->ors_attrs[i].an_name );
2151         }
2152
2153         op2->o_authz = op->o_authz;
2154         op2->o_ndn.bv_val = ptr;
2155         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
2156         op2->o_dn = op2->o_ndn;
2157         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
2158         op2->o_req_dn.bv_val = ptr;
2159         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
2160         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
2161         op2->o_req_ndn.bv_val = ptr;
2162         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
2163         op2->ors_filterstr.bv_val = ptr;
2164         strcpy( ptr, so->s_filterstr.bv_val );
2165         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
2166
2167         /* Skip the AND/GE clause that we stuck on in front */
2168         if ( so->s_flags & PS_FIX_FILTER ) {
2169                 op2->ors_filter = op->ors_filter->f_and->f_next;
2170                 so->s_flags ^= PS_FIX_FILTER;
2171         } else {
2172                 op2->ors_filter = op->ors_filter;
2173         }
2174         op2->ors_filter = filter_dup( op2->ors_filter, NULL );
2175         so->s_op = op2;
2176
2177         /* Copy any cached group ACLs individually */
2178         op2->o_groups = NULL;
2179         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
2180                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
2181                 *g2 = *g1;
2182                 strcpy( g2->ga_ndn, g1->ga_ndn );
2183                 g2->ga_next = op2->o_groups;
2184                 op2->o_groups = g2;
2185         }
2186         /* Don't allow any further group caching */
2187         op2->o_do_not_cache = 1;
2188
2189         /* Add op2 to conn so abandon will find us */
2190         op->o_conn->c_n_ops_executing++;
2191         op->o_conn->c_n_ops_completed--;
2192         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
2193         so->s_flags |= PS_IS_DETACHED;
2194
2195         /* Prevent anyone else from trying to send a result for this op */
2196         op->o_abandon = 1;
2197 }
2198
2199 static int
2200 syncprov_search_response( Operation *op, SlapReply *rs )
2201 {
2202         searchstate *ss = op->o_callback->sc_private;
2203         slap_overinst *on = ss->ss_on;
2204         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2205         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
2206
2207         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
2208                 Attribute *a;
2209                 /* If we got a referral without a referral object, there's
2210                  * something missing that we cannot replicate. Just ignore it.
2211                  * The consumer will abort because we didn't send the expected
2212                  * control.
2213                  */
2214                 if ( !rs->sr_entry ) {
2215                         assert( rs->sr_entry != NULL );
2216                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
2217                         return SLAP_CB_CONTINUE;
2218                 }
2219                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryCSN );
2220                 if ( a == NULL && rs->sr_operational_attrs != NULL ) {
2221                         a = attr_find( rs->sr_operational_attrs, slap_schema.si_ad_entryCSN );
2222                 }
2223                 if ( a ) {
2224                         int i, sid;
2225                         sid = slap_parse_csn_sid( &a->a_nvals[0] );
2226
2227                         /* Don't send changed entries back to the originator */
2228                         if ( sid == srs->sr_state.sid && srs->sr_state.numcsns ) {
2229                                 Debug( LDAP_DEBUG_SYNC,
2230                                         "Entry %s changed by peer, ignored\n",
2231                                         rs->sr_entry->e_name.bv_val, 0, 0 );
2232                                 return LDAP_SUCCESS;
2233                         }
2234
2235                         /* If not a persistent search */
2236                         if ( !ss->ss_so ) {
2237                                 /* Make sure entry is less than the snapshot'd contextCSN */
2238                                 for ( i=0; i<ss->ss_numcsns; i++ ) {
2239                                         if ( sid == ss->ss_sids[i] && ber_bvcmp( &a->a_nvals[0],
2240                                                 &ss->ss_ctxcsn[i] ) > 0 ) {
2241                                                 Debug( LDAP_DEBUG_SYNC,
2242                                                         "Entry %s CSN %s greater than snapshot %s\n",
2243                                                         rs->sr_entry->e_name.bv_val,
2244                                                         a->a_nvals[0].bv_val,
2245                                                         ss->ss_ctxcsn[i].bv_val );
2246                                                 return LDAP_SUCCESS;
2247                                         }
2248                                 }
2249                         }
2250
2251                         /* Don't send old entries twice */
2252                         if ( srs->sr_state.ctxcsn ) {
2253                                 for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2254                                         if ( sid == srs->sr_state.sids[i] &&
2255                                                 ber_bvcmp( &a->a_nvals[0],
2256                                                         &srs->sr_state.ctxcsn[i] )<= 0 ) {
2257                                                 Debug( LDAP_DEBUG_SYNC,
2258                                                         "Entry %s CSN %s older or equal to ctx %s\n",
2259                                                         rs->sr_entry->e_name.bv_val,
2260                                                         a->a_nvals[0].bv_val,
2261                                                         srs->sr_state.ctxcsn[i].bv_val );
2262                                                 return LDAP_SUCCESS;
2263                                         }
2264                                 }
2265                         }
2266                 }
2267                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2268                         op->o_tmpmemctx );
2269                 rs->sr_ctrls[1] = NULL;
2270                 /* If we're in delta-sync mode, always send a cookie */
2271                 if ( si->si_nopres && si->si_usehint && a ) {
2272                         struct berval cookie;
2273                         slap_compose_sync_cookie( op, &cookie, a->a_nvals, srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2274                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2275                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 1, &cookie );
2276                 } else {
2277                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2278                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
2279                 }
2280         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
2281                 struct berval cookie = BER_BVNULL;
2282
2283                 if ( ( ss->ss_flags & SS_CHANGED ) &&
2284                         ss->ss_ctxcsn && !BER_BVISNULL( &ss->ss_ctxcsn[0] )) {
2285                         slap_compose_sync_cookie( op, &cookie, ss->ss_ctxcsn,
2286                                 srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2287
2288                         Debug( LDAP_DEBUG_SYNC, "syncprov_search_response: cookie=%s\n", cookie.bv_val, 0, 0 );
2289                 }
2290
2291                 /* Is this a regular refresh?
2292                  * Note: refresh never gets here if there were no changes
2293                  */
2294                 if ( !ss->ss_so ) {
2295                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2296                                 op->o_tmpmemctx );
2297                         rs->sr_ctrls[1] = NULL;
2298                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
2299                                 0, 1, &cookie, ( ss->ss_flags & SS_PRESENT ) ?  LDAP_SYNC_REFRESH_PRESENTS :
2300                                         LDAP_SYNC_REFRESH_DELETES );
2301                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2302                 } else {
2303                 /* It's RefreshAndPersist, transition to Persist phase */
2304                         syncprov_sendinfo( op, rs, ( ss->ss_flags & SS_PRESENT ) ?
2305                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
2306                                 ( ss->ss_flags & SS_CHANGED ) ? &cookie : NULL,
2307                                 1, NULL, 0 );
2308                         if ( !BER_BVISNULL( &cookie ))
2309                                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2310
2311                         /* Detach this Op from frontend control */
2312                         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
2313
2314                         /* But not if this connection was closed along the way */
2315                         if ( op->o_abandon ) {
2316                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2317                                 /* syncprov_ab_cleanup will free this syncop */
2318                                 return SLAPD_ABANDON;
2319
2320                         } else {
2321                                 ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
2322                                 /* Turn off the refreshing flag */
2323                                 ss->ss_so->s_flags ^= PS_IS_REFRESHING;
2324
2325                                 syncprov_detach_op( op, ss->ss_so, on );
2326
2327                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2328
2329                                 /* If there are queued responses, fire them off */
2330                                 if ( ss->ss_so->s_res )
2331                                         syncprov_qstart( ss->ss_so );
2332                                 ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
2333                         }
2334
2335                         return LDAP_SUCCESS;
2336                 }
2337         }
2338
2339         return SLAP_CB_CONTINUE;
2340 }
2341
2342 static int
2343 syncprov_op_search( Operation *op, SlapReply *rs )
2344 {
2345         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2346         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2347         slap_callback   *cb;
2348         int gotstate = 0, changed = 0, do_present = 0;
2349         syncops *sop = NULL;
2350         searchstate *ss;
2351         sync_control *srs;
2352         BerVarray ctxcsn;
2353         int i, *sids, numcsns;
2354         struct berval mincsn;
2355
2356         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
2357
2358         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
2359                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
2360                 return rs->sr_err;
2361         }
2362
2363         srs = op->o_controls[slap_cids.sc_LDAPsync];
2364
2365         /* If this is a persistent search, set it up right away */
2366         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
2367                 syncops so = {0};
2368                 fbase_cookie fc;
2369                 opcookie opc;
2370                 slap_callback sc;
2371
2372                 fc.fss = &so;
2373                 fc.fbase = 0;
2374                 so.s_eid = NOID;
2375                 so.s_op = op;
2376                 so.s_flags = PS_IS_REFRESHING | PS_FIND_BASE;
2377                 /* syncprov_findbase expects to be called as a callback... */
2378                 sc.sc_private = &opc;
2379                 opc.son = on;
2380                 ldap_pvt_thread_mutex_init( &so.s_mutex );
2381                 cb = op->o_callback;
2382                 op->o_callback = &sc;
2383                 rs->sr_err = syncprov_findbase( op, &fc );
2384                 op->o_callback = cb;
2385                 ldap_pvt_thread_mutex_destroy( &so.s_mutex );
2386
2387                 if ( rs->sr_err != LDAP_SUCCESS ) {
2388                         send_ldap_result( op, rs );
2389                         return rs->sr_err;
2390                 }
2391                 sop = ch_malloc( sizeof( syncops ));
2392                 *sop = so;
2393                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
2394                 sop->s_rid = srs->sr_state.rid;
2395                 sop->s_sid = srs->sr_state.sid;
2396                 sop->s_inuse = 1;
2397
2398                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2399                 sop->s_next = si->si_ops;
2400                 si->si_ops = sop;
2401                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2402         }
2403
2404         /* snapshot the ctxcsn */
2405         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2406         numcsns = si->si_numcsns;
2407         if ( numcsns ) {
2408                 ber_bvarray_dup_x( &ctxcsn, si->si_ctxcsn, op->o_tmpmemctx );
2409                 sids = op->o_tmpalloc( numcsns * sizeof(int), op->o_tmpmemctx );
2410                 for ( i=0; i<numcsns; i++ )
2411                         sids[i] = si->si_sids[i];
2412         } else {
2413                 ctxcsn = NULL;
2414                 sids = NULL;
2415         }
2416         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2417
2418         /* If we have a cookie, handle the PRESENT lookups */
2419         if ( srs->sr_state.ctxcsn ) {
2420                 sessionlog *sl;
2421                 int i, j;
2422
2423                 /* If we don't have any CSN of our own yet, pretend nothing
2424                  * has changed.
2425                  */
2426                 if ( !numcsns )
2427                         goto no_change;
2428
2429                 if ( !si->si_nopres )
2430                         do_present = SS_PRESENT;
2431
2432                 /* If there are SIDs we don't recognize in the cookie, drop them */
2433                 for (i=0; i<srs->sr_state.numcsns; ) {
2434                         for (j=0; j<numcsns; j++) {
2435                                 if ( srs->sr_state.sids[i] == sids[j] ) {
2436                                         break;
2437                                 }
2438                         }
2439                         /* not found */
2440                         if ( j == numcsns ) {
2441                                 struct berval tmp = srs->sr_state.ctxcsn[i];
2442                                 j = srs->sr_state.numcsns - 1;
2443                                 srs->sr_state.ctxcsn[i] = srs->sr_state.ctxcsn[j];
2444                                 tmp.bv_len = 0;
2445                                 srs->sr_state.ctxcsn[j] = tmp;
2446                                 srs->sr_state.numcsns = j;
2447                                 srs->sr_state.sids[i] = srs->sr_state.sids[j];
2448                                 continue;
2449                         }
2450                         i++;
2451                 }
2452
2453                 /* Find the smallest CSN */
2454                 mincsn = srs->sr_state.ctxcsn[0];
2455                 for ( i=1; i<srs->sr_state.numcsns; i++ ) {
2456                         if ( ber_bvcmp( &mincsn, &srs->sr_state.ctxcsn[i] ) > 0 )
2457                                 mincsn = srs->sr_state.ctxcsn[i];
2458                 }
2459
2460                 /* If nothing has changed, shortcut it */
2461                 if ( srs->sr_state.numcsns == numcsns ) {
2462                         int i, j, newer;
2463                         for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2464                                 for ( j=0; j<numcsns; j++ ) {
2465                                         if ( srs->sr_state.sids[i] != sids[j] )
2466                                                 continue;
2467                                         newer = ber_bvcmp( &srs->sr_state.ctxcsn[i], &ctxcsn[j] );
2468                                         /* If our state is newer, tell consumer about changes */
2469                                         if ( newer < 0 )
2470                                                 changed = SS_CHANGED;
2471                                         else if ( newer > 0 ) {
2472                                         /* our state is older, tell consumer nothing */
2473                                                 if ( sop ) {
2474                                                         syncops **sp = &si->si_ops;
2475
2476                                                         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2477                                                         while ( *sp != sop )
2478                                                                 sp = &(*sp)->s_next;
2479                                                         *sp = sop->s_next;
2480                                                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2481                                                         ch_free( sop );
2482                                                 }
2483                                                 rs->sr_err = LDAP_SUCCESS;
2484                                                 rs->sr_ctrls = NULL;
2485                                                 send_ldap_result( op, rs );
2486                                                 return rs->sr_err;
2487                                         }
2488                                         break;
2489                                 }
2490                                 if ( changed )
2491                                         break;
2492                         }
2493                         if ( !changed ) {
2494                                 do_present = 0;
2495 no_change:              if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
2496                                         LDAPControl     *ctrls[2];
2497
2498                                         ctrls[0] = NULL;
2499                                         ctrls[1] = NULL;
2500                                         syncprov_done_ctrl( op, rs, ctrls, 0, 0,
2501                                                 NULL, LDAP_SYNC_REFRESH_DELETES );
2502                                         rs->sr_ctrls = ctrls;
2503                                         rs->sr_err = LDAP_SUCCESS;
2504                                         send_ldap_result( op, rs );
2505                                         rs->sr_ctrls = NULL;
2506                                         return rs->sr_err;
2507                                 }
2508                                 goto shortcut;
2509                         }
2510                 } else {
2511                         /* consumer doesn't have the right number of CSNs */
2512                         changed = SS_CHANGED;
2513                 }
2514                 /* Do we have a sessionlog for this search? */
2515                 sl=si->si_logs;
2516                 if ( sl ) {
2517                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
2518                         /* Are there any log entries, and is the consumer state
2519                          * present in the session log?
2520                          */
2521                         if ( sl->sl_num > 0 && ber_bvcmp( &mincsn, &sl->sl_mincsn ) >= 0 ) {
2522                                 do_present = 0;
2523                                 /* mutex is unlocked in playlog */
2524                                 syncprov_playlog( op, rs, sl, srs, ctxcsn, numcsns, sids );
2525                         } else {
2526                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
2527                         }
2528                 }
2529                 /* Is the CSN still present in the database? */
2530                 if ( syncprov_findcsn( op, FIND_CSN ) != LDAP_SUCCESS ) {
2531                         /* No, so a reload is required */
2532                         /* the 2.2 consumer doesn't send this hint */
2533                         if ( si->si_usehint && srs->sr_rhint == 0 ) {
2534                                 if ( ctxcsn )
2535                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2536                                 if ( sids )
2537                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2538                                 send_ldap_error( op, rs, LDAP_SYNC_REFRESH_REQUIRED, "sync cookie is stale" );
2539                                 return rs->sr_err;
2540                         }
2541                         if ( srs->sr_state.ctxcsn ) {
2542                                 ber_bvarray_free_x( srs->sr_state.ctxcsn, op->o_tmpmemctx );
2543                                 srs->sr_state.ctxcsn = NULL;
2544                         }
2545                         if ( srs->sr_state.sids ) {
2546                                 slap_sl_free( srs->sr_state.sids, op->o_tmpmemctx );
2547                                 srs->sr_state.sids = NULL;
2548                         }
2549                         srs->sr_state.numcsns = 0;
2550                 } else {
2551                         gotstate = 1;
2552                         /* If changed and doing Present lookup, send Present UUIDs */
2553                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT ) !=
2554                                 LDAP_SUCCESS ) {
2555                                 if ( ctxcsn )
2556                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2557                                 if ( sids )
2558                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2559                                 send_ldap_result( op, rs );
2560                                 return rs->sr_err;
2561                         }
2562                 }
2563         } else {
2564                 /* No consumer state, assume something has changed */
2565                 changed = SS_CHANGED;
2566         }
2567
2568 shortcut:
2569         /* Append CSN range to search filter, save original filter
2570          * for persistent search evaluation
2571          */
2572         if ( sop ) {
2573                 sop->s_filterstr= op->ors_filterstr;
2574         }
2575
2576         /* If something changed, find the changes */
2577         if ( gotstate && changed ) {
2578                 Filter *fand, *fava;
2579
2580                 fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2581                 fand->f_choice = LDAP_FILTER_AND;
2582                 fand->f_next = NULL;
2583                 fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2584                 fand->f_and = fava;
2585                 fava->f_choice = LDAP_FILTER_GE;
2586                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
2587                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
2588 #ifdef LDAP_COMP_MATCH
2589                 fava->f_ava->aa_cf = NULL;
2590 #endif
2591                 ber_dupbv_x( &fava->f_ava->aa_value, &mincsn, op->o_tmpmemctx );
2592                 fava->f_next = op->ors_filter;
2593                 op->ors_filter = fand;
2594                 filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
2595                 if ( sop )
2596                         sop->s_flags |= PS_FIX_FILTER;
2597         }
2598
2599         /* Let our callback add needed info to returned entries */
2600         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
2601         ss = (searchstate *)(cb+1);
2602         ss->ss_on = on;
2603         ss->ss_so = sop;
2604         ss->ss_flags = do_present | changed;
2605         ss->ss_ctxcsn = ctxcsn;
2606         ss->ss_numcsns = numcsns;
2607         ss->ss_sids = sids;
2608         cb->sc_response = syncprov_search_response;
2609         cb->sc_cleanup = syncprov_search_cleanup;
2610         cb->sc_private = ss;
2611         cb->sc_next = op->o_callback;
2612         op->o_callback = cb;
2613
2614         /* If this is a persistent search and no changes were reported during
2615          * the refresh phase, just invoke the response callback to transition
2616          * us into persist phase
2617          */
2618         if ( !changed ) {
2619                 rs->sr_err = LDAP_SUCCESS;
2620                 rs->sr_nentries = 0;
2621                 send_ldap_result( op, rs );
2622                 return rs->sr_err;
2623         }
2624         return SLAP_CB_CONTINUE;
2625 }
2626
2627 static int
2628 syncprov_operational(
2629         Operation *op,
2630         SlapReply *rs )
2631 {
2632         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2633         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2634
2635         /* This prevents generating unnecessarily; frontend will strip
2636          * any statically stored copy.
2637          */
2638         if ( op->o_sync != SLAP_CONTROL_NONE )
2639                 return SLAP_CB_CONTINUE;
2640
2641         if ( rs->sr_entry &&
2642                 dn_match( &rs->sr_entry->e_nname, &si->si_contextdn )) {
2643
2644                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
2645                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
2646                         Attribute *a, **ap = NULL;
2647
2648                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
2649                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
2650                                         break;
2651                         }
2652
2653                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2654                         if ( si->si_ctxcsn ) {
2655                                 if ( !a ) {
2656                                         for ( ap = &rs->sr_operational_attrs; *ap;
2657                                                 ap=&(*ap)->a_next );
2658
2659                                         a = attr_alloc( slap_schema.si_ad_contextCSN );
2660                                         *ap = a;
2661                                 }
2662
2663                                 if ( !ap ) {
2664                                         if ( !(rs->sr_flags & REP_ENTRY_MODIFIABLE) ) {
2665                                                 Entry *e = entry_dup( rs->sr_entry );
2666                                                 if ( rs->sr_flags & REP_ENTRY_MUSTRELEASE ) {
2667                                                         overlay_entry_release_ov( op, rs->sr_entry, 0, on );
2668                                                         rs->sr_flags ^= REP_ENTRY_MUSTRELEASE;
2669                                                 } else if ( rs->sr_flags & REP_ENTRY_MUSTBEFREED ) {
2670                                                         entry_free( rs->sr_entry );
2671                                                 }
2672                                                 rs->sr_entry = e;
2673                                                 rs->sr_flags |=
2674                                                         REP_ENTRY_MODIFIABLE|REP_ENTRY_MUSTBEFREED;
2675                                                 a = attr_find( rs->sr_entry->e_attrs,
2676                                                         slap_schema.si_ad_contextCSN );
2677                                         }
2678                                         if ( a->a_nvals != a->a_vals ) {
2679                                                 ber_bvarray_free( a->a_nvals );
2680                                         }
2681                                         a->a_nvals = NULL;
2682                                         ber_bvarray_free( a->a_vals );
2683                                         a->a_vals = NULL;
2684                                         a->a_numvals = 0;
2685                                 }
2686                                 attr_valadd( a, si->si_ctxcsn, si->si_ctxcsn, si->si_numcsns );
2687                         }
2688                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2689                 }
2690         }
2691         return SLAP_CB_CONTINUE;
2692 }
2693
2694 enum {
2695         SP_CHKPT = 1,
2696         SP_SESSL,
2697         SP_NOPRES,
2698         SP_USEHINT
2699 };
2700
2701 static ConfigDriver sp_cf_gen;
2702
2703 static ConfigTable spcfg[] = {
2704         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2705                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2706                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2707                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2708         { "syncprov-sessionlog", "ops", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2709                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2710                         "DESC 'Session log size in ops' "
2711                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2712         { "syncprov-nopresent", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_NOPRES,
2713                 sp_cf_gen, "( OLcfgOvAt:1.3 NAME 'olcSpNoPresent' "
2714                         "DESC 'Omit Present phase processing' "
2715                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2716         { "syncprov-reloadhint", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_USEHINT,
2717                 sp_cf_gen, "( OLcfgOvAt:1.4 NAME 'olcSpReloadHint' "
2718                         "DESC 'Observe Reload Hint in Request control' "
2719                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2720         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2721 };
2722
2723 static ConfigOCs spocs[] = {
2724         { "( OLcfgOvOc:1.1 "
2725                 "NAME 'olcSyncProvConfig' "
2726                 "DESC 'SyncRepl Provider configuration' "
2727                 "SUP olcOverlayConfig "
2728                 "MAY ( olcSpCheckpoint "
2729                         "$ olcSpSessionlog "
2730                         "$ olcSpNoPresent "
2731                         "$ olcSpReloadHint "
2732                 ") )",
2733                         Cft_Overlay, spcfg },
2734         { NULL, 0, NULL }
2735 };
2736
2737 static int
2738 sp_cf_gen(ConfigArgs *c)
2739 {
2740         slap_overinst           *on = (slap_overinst *)c->bi;
2741         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2742         int rc = 0;
2743
2744         if ( c->op == SLAP_CONFIG_EMIT ) {
2745                 switch ( c->type ) {
2746                 case SP_CHKPT:
2747                         if ( si->si_chkops || si->si_chktime ) {
2748                                 struct berval bv;
2749                                 /* we assume si_chktime is a multiple of 60
2750                                  * because the parsed value was originally
2751                                  * multiplied by 60 */
2752                                 bv.bv_len = snprintf( c->cr_msg, sizeof( c->cr_msg ),
2753                                         "%d %d", si->si_chkops, si->si_chktime/60 );
2754                                 if ( bv.bv_len >= sizeof( c->cr_msg ) ) {
2755                                         rc = 1;
2756                                 } else {
2757                                         bv.bv_val = c->cr_msg;
2758                                         value_add_one( &c->rvalue_vals, &bv );
2759                                 }
2760                         } else {
2761                                 rc = 1;
2762                         }
2763                         break;
2764                 case SP_SESSL:
2765                         if ( si->si_logs ) {
2766                                 c->value_int = si->si_logs->sl_size;
2767                         } else {
2768                                 rc = 1;
2769                         }
2770                         break;
2771                 case SP_NOPRES:
2772                         if ( si->si_nopres ) {
2773                                 c->value_int = 1;
2774                         } else {
2775                                 rc = 1;
2776                         }
2777                         break;
2778                 case SP_USEHINT:
2779                         if ( si->si_usehint ) {
2780                                 c->value_int = 1;
2781                         } else {
2782                                 rc = 1;
2783                         }
2784                         break;
2785                 }
2786                 return rc;
2787         } else if ( c->op == LDAP_MOD_DELETE ) {
2788                 switch ( c->type ) {
2789                 case SP_CHKPT:
2790                         si->si_chkops = 0;
2791                         si->si_chktime = 0;
2792                         break;
2793                 case SP_SESSL:
2794                         if ( si->si_logs )
2795                                 si->si_logs->sl_size = 0;
2796                         else
2797                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2798                         break;
2799                 case SP_NOPRES:
2800                         if ( si->si_nopres )
2801                                 si->si_nopres = 0;
2802                         else
2803                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2804                         break;
2805                 case SP_USEHINT:
2806                         if ( si->si_usehint )
2807                                 si->si_usehint = 0;
2808                         else
2809                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2810                         break;
2811                 }
2812                 return rc;
2813         }
2814         switch ( c->type ) {
2815         case SP_CHKPT:
2816                 if ( lutil_atoi( &si->si_chkops, c->argv[1] ) != 0 ) {
2817                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint ops # \"%s\"",
2818                                 c->argv[0], c->argv[1] );
2819                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2820                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2821                         return ARG_BAD_CONF;
2822                 }
2823                 if ( si->si_chkops <= 0 ) {
2824                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint ops # \"%d\"",
2825                                 c->argv[0], si->si_chkops );
2826                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2827                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2828                         return ARG_BAD_CONF;
2829                 }
2830                 if ( lutil_atoi( &si->si_chktime, c->argv[2] ) != 0 ) {
2831                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint time \"%s\"",
2832                                 c->argv[0], c->argv[1] );
2833                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2834                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2835                         return ARG_BAD_CONF;
2836                 }
2837                 if ( si->si_chktime <= 0 ) {
2838                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint time \"%d\"",
2839                                 c->argv[0], si->si_chkops );
2840                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2841                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2842                         return ARG_BAD_CONF;
2843                 }
2844                 si->si_chktime *= 60;
2845                 break;
2846         case SP_SESSL: {
2847                 sessionlog *sl;
2848                 int size = c->value_int;
2849
2850                 if ( size < 0 ) {
2851                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s size %d is negative",
2852                                 c->argv[0], size );
2853                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2854                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2855                         return ARG_BAD_CONF;
2856                 }
2857                 sl = si->si_logs;
2858                 if ( !sl ) {
2859                         sl = ch_malloc( sizeof( sessionlog ) + LDAP_PVT_CSNSTR_BUFSIZE );
2860                         sl->sl_mincsn.bv_val = (char *)(sl+1);
2861                         sl->sl_mincsn.bv_len = 0;
2862                         sl->sl_num = 0;
2863                         sl->sl_head = sl->sl_tail = NULL;
2864                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
2865                         si->si_logs = sl;
2866                 }
2867                 sl->sl_size = size;
2868                 }
2869                 break;
2870         case SP_NOPRES:
2871                 si->si_nopres = c->value_int;
2872                 break;
2873         case SP_USEHINT:
2874                 si->si_usehint = c->value_int;
2875                 break;
2876         }
2877         return rc;
2878 }
2879
2880 /* ITS#3456 we cannot run this search on the main thread, must use a
2881  * child thread in order to insure we have a big enough stack.
2882  */
2883 static void *
2884 syncprov_db_otask(
2885         void *ptr
2886 )
2887 {
2888         syncprov_findcsn( ptr, FIND_MAXCSN );
2889         return NULL;
2890 }
2891
2892 /* Read any existing contextCSN from the underlying db.
2893  * Then search for any entries newer than that. If no value exists,
2894  * just generate it. Cache whatever result.
2895  */
2896 static int
2897 syncprov_db_open(
2898         BackendDB *be,
2899         ConfigReply *cr
2900 )
2901 {
2902         slap_overinst   *on = (slap_overinst *) be->bd_info;
2903         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2904
2905         Connection conn = { 0 };
2906         OperationBuffer opbuf;
2907         Operation *op;
2908         Entry *e = NULL;
2909         Attribute *a;
2910         int rc;
2911         void *thrctx = NULL;
2912
2913         if ( !SLAP_LASTMOD( be )) {
2914                 Debug( LDAP_DEBUG_ANY,
2915                         "syncprov_db_open: invalid config, lastmod must be enabled\n", 0, 0, 0 );
2916                 return -1;
2917         }
2918
2919         if ( slapMode & SLAP_TOOL_MODE ) {
2920                 return 0;
2921         }
2922
2923         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
2924         if ( rc ) {
2925                 return rc;
2926         }
2927
2928         thrctx = ldap_pvt_thread_pool_context();
2929         connection_fake_init2( &conn, &opbuf, thrctx, 0 );
2930         op = &opbuf.ob_op;
2931         op->o_bd = be;
2932         op->o_dn = be->be_rootdn;
2933         op->o_ndn = be->be_rootndn;
2934
2935         if ( SLAP_SYNC_SUBENTRY( be )) {
2936                 build_new_dn( &si->si_contextdn, be->be_nsuffix,
2937                         (struct berval *)&slap_ldapsync_cn_bv, NULL );
2938         } else {
2939                 si->si_contextdn = be->be_nsuffix[0];
2940         }
2941         rc = overlay_entry_get_ov( op, &si->si_contextdn, NULL,
2942                 slap_schema.si_ad_contextCSN, 0, &e, on );
2943
2944         if ( e ) {
2945                 ldap_pvt_thread_t tid;
2946
2947                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
2948                 if ( a ) {
2949                         ber_bvarray_dup_x( &si->si_ctxcsn, a->a_vals, NULL );
2950                         si->si_numcsns = a->a_numvals;
2951                         si->si_sids = slap_parse_csn_sids( si->si_ctxcsn, a->a_numvals, NULL );
2952                 }
2953                 overlay_entry_release_ov( op, e, 0, on );
2954                 if ( si->si_ctxcsn && !SLAP_DBCLEAN( be )) {
2955                         op->o_req_dn = be->be_suffix[0];
2956                         op->o_req_ndn = be->be_nsuffix[0];
2957                         op->ors_scope = LDAP_SCOPE_SUBTREE;
2958                         ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
2959                         ldap_pvt_thread_join( tid, NULL );
2960                 }
2961         }
2962
2963         /* Didn't find a contextCSN, should we generate one? */
2964         if ( !si->si_ctxcsn ) {
2965                 char csnbuf[ LDAP_PVT_CSNSTR_BUFSIZE ];
2966                 struct berval csn;
2967
2968                 if ( SLAP_SYNC_SHADOW( op->o_bd )) {
2969                 /* If we're also a consumer, then don't generate anything.
2970                  * Wait for our provider to send it to us, or for a local
2971                  * modify if we have multimaster.
2972                  */
2973                         goto out;
2974                 }
2975                 csn.bv_val = csnbuf;
2976                 csn.bv_len = sizeof( csnbuf );
2977                 slap_get_csn( op, &csn, 0 );
2978                 value_add_one( &si->si_ctxcsn, &csn );
2979                 si->si_numcsns = 1;
2980                 si->si_sids = ch_malloc( sizeof(int) );
2981                 si->si_sids[0] = slap_serverID;
2982
2983                 /* make sure we do a checkpoint on close */
2984                 si->si_numops++;
2985         }
2986
2987 out:
2988         op->o_bd->bd_info = (BackendInfo *)on;
2989         return 0;
2990 }
2991
2992 /* Write the current contextCSN into the underlying db.
2993  */
2994 static int
2995 syncprov_db_close(
2996         BackendDB *be,
2997         ConfigReply *cr
2998 )
2999 {
3000     slap_overinst   *on = (slap_overinst *) be->bd_info;
3001     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3002
3003         if ( slapMode & SLAP_TOOL_MODE ) {
3004                 return 0;
3005         }
3006         if ( si->si_numops ) {
3007                 Connection conn = {0};
3008                 OperationBuffer opbuf;
3009                 Operation *op;
3010                 SlapReply rs = {REP_RESULT};
3011                 void *thrctx;
3012
3013                 thrctx = ldap_pvt_thread_pool_context();
3014                 connection_fake_init2( &conn, &opbuf, thrctx, 0 );
3015                 op = &opbuf.ob_op;
3016                 op->o_bd = be;
3017                 op->o_dn = be->be_rootdn;
3018                 op->o_ndn = be->be_rootndn;
3019                 syncprov_checkpoint( op, &rs, on );
3020         }
3021
3022     return 0;
3023 }
3024
3025 static int
3026 syncprov_db_init(
3027         BackendDB *be,
3028         ConfigReply *cr
3029 )
3030 {
3031         slap_overinst   *on = (slap_overinst *)be->bd_info;
3032         syncprov_info_t *si;
3033
3034         if ( SLAP_ISGLOBALOVERLAY( be ) ) {
3035                 Debug( LDAP_DEBUG_ANY,
3036                         "syncprov must be instantiated within a database.\n",
3037                         0, 0, 0 );
3038                 return 1;
3039         }
3040
3041         si = ch_calloc(1, sizeof(syncprov_info_t));
3042         on->on_bi.bi_private = si;
3043         ldap_pvt_thread_rdwr_init( &si->si_csn_rwlock );
3044         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
3045         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
3046         ldap_pvt_thread_mutex_init( &si->si_resp_mutex );
3047
3048         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
3049         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
3050         csn_anlist[1].an_desc = slap_schema.si_ad_entryUUID;
3051         csn_anlist[1].an_name = slap_schema.si_ad_entryUUID->ad_cname;
3052
3053         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
3054         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
3055
3056         return 0;
3057 }
3058
3059 static int
3060 syncprov_db_destroy(
3061         BackendDB *be,
3062         ConfigReply *cr
3063 )
3064 {
3065         slap_overinst   *on = (slap_overinst *)be->bd_info;
3066         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3067
3068         if ( si ) {
3069                 if ( si->si_logs ) {
3070                         slog_entry *se = si->si_logs->sl_head;
3071
3072                         while ( se ) {
3073                                 slog_entry *se_next = se->se_next;
3074                                 ch_free( se );
3075                                 se = se_next;
3076                         }
3077
3078                         ch_free( si->si_logs );
3079                 }
3080                 if ( si->si_ctxcsn )
3081                         ber_bvarray_free( si->si_ctxcsn );
3082                 if ( si->si_sids )
3083                         ch_free( si->si_sids );
3084                 ldap_pvt_thread_mutex_destroy( &si->si_resp_mutex );
3085                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
3086                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
3087                 ldap_pvt_thread_rdwr_destroy( &si->si_csn_rwlock );
3088                 ch_free( si );
3089         }
3090
3091         return 0;
3092 }
3093
3094 static int syncprov_parseCtrl (
3095         Operation *op,
3096         SlapReply *rs,
3097         LDAPControl *ctrl )
3098 {
3099         ber_tag_t tag;
3100         BerElementBuffer berbuf;
3101         BerElement *ber = (BerElement *)&berbuf;
3102         ber_int_t mode;
3103         ber_len_t len;
3104         struct berval cookie = BER_BVNULL;
3105         sync_control *sr;
3106         int rhint = 0;
3107
3108         if ( op->o_sync != SLAP_CONTROL_NONE ) {
3109                 rs->sr_text = "Sync control specified multiple times";
3110                 return LDAP_PROTOCOL_ERROR;
3111         }
3112
3113         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
3114                 rs->sr_text = "Sync control specified with pagedResults control";
3115                 return LDAP_PROTOCOL_ERROR;
3116         }
3117
3118         if ( BER_BVISNULL( &ctrl->ldctl_value ) ) {
3119                 rs->sr_text = "Sync control value is absent";
3120                 return LDAP_PROTOCOL_ERROR;
3121         }
3122
3123         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
3124                 rs->sr_text = "Sync control value is empty";
3125                 return LDAP_PROTOCOL_ERROR;
3126         }
3127
3128         /* Parse the control value
3129          *      syncRequestValue ::= SEQUENCE {
3130          *              mode   ENUMERATED {
3131          *                      -- 0 unused
3132          *                      refreshOnly             (1),
3133          *                      -- 2 reserved
3134          *                      refreshAndPersist       (3)
3135          *              },
3136          *              cookie  syncCookie OPTIONAL
3137          *      }
3138          */
3139
3140         ber_init2( ber, &ctrl->ldctl_value, 0 );
3141
3142         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
3143                 rs->sr_text = "Sync control : mode decoding error";
3144                 return LDAP_PROTOCOL_ERROR;
3145         }
3146
3147         switch( mode ) {
3148         case LDAP_SYNC_REFRESH_ONLY:
3149                 mode = SLAP_SYNC_REFRESH;
3150                 break;
3151         case LDAP_SYNC_REFRESH_AND_PERSIST:
3152                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
3153                 break;
3154         default:
3155                 rs->sr_text = "Sync control : unknown update mode";
3156                 return LDAP_PROTOCOL_ERROR;
3157         }
3158
3159         tag = ber_peek_tag( ber, &len );
3160
3161         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
3162                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
3163                         rs->sr_text = "Sync control : cookie decoding error";
3164                         return LDAP_PROTOCOL_ERROR;
3165                 }
3166                 tag = ber_peek_tag( ber, &len );
3167         }
3168         if ( tag == LDAP_TAG_RELOAD_HINT ) {
3169                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
3170                         rs->sr_text = "Sync control : rhint decoding error";
3171                         return LDAP_PROTOCOL_ERROR;
3172                 }
3173         }
3174         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
3175                         rs->sr_text = "Sync control : decoding error";
3176                         return LDAP_PROTOCOL_ERROR;
3177         }
3178         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
3179         sr->sr_rhint = rhint;
3180         if (!BER_BVISNULL(&cookie)) {
3181                 ber_dupbv_x( &sr->sr_state.octet_str, &cookie, op->o_tmpmemctx );
3182                 /* If parse fails, pretend no cookie was sent */
3183                 if ( slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx ) ||
3184                         sr->sr_state.rid == -1 ) {
3185                         if ( sr->sr_state.ctxcsn ) {
3186                                 ber_bvarray_free_x( sr->sr_state.ctxcsn, op->o_tmpmemctx );
3187                                 sr->sr_state.ctxcsn = NULL;
3188                         }
3189                         sr->sr_state.numcsns = 0;
3190                 }
3191         }
3192
3193         op->o_controls[slap_cids.sc_LDAPsync] = sr;
3194
3195         op->o_sync = ctrl->ldctl_iscritical
3196                 ? SLAP_CONTROL_CRITICAL
3197                 : SLAP_CONTROL_NONCRITICAL;
3198
3199         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
3200
3201         return LDAP_SUCCESS;
3202 }
3203
3204 /* This overlay is set up for dynamic loading via moduleload. For static
3205  * configuration, you'll need to arrange for the slap_overinst to be
3206  * initialized and registered by some other function inside slapd.
3207  */
3208
3209 static slap_overinst            syncprov;
3210
3211 int
3212 syncprov_initialize()
3213 {
3214         int rc;
3215
3216         rc = register_supported_control( LDAP_CONTROL_SYNC,
3217                 SLAP_CTRL_SEARCH, NULL,
3218                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
3219         if ( rc != LDAP_SUCCESS ) {
3220                 Debug( LDAP_DEBUG_ANY,
3221                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
3222                 return rc;
3223         }
3224
3225         syncprov.on_bi.bi_type = "syncprov";
3226         syncprov.on_bi.bi_db_init = syncprov_db_init;
3227         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
3228         syncprov.on_bi.bi_db_open = syncprov_db_open;
3229         syncprov.on_bi.bi_db_close = syncprov_db_close;
3230
3231         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
3232         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
3233
3234         syncprov.on_bi.bi_op_add = syncprov_op_mod;
3235         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
3236         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
3237         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
3238         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
3239         syncprov.on_bi.bi_op_search = syncprov_op_search;
3240         syncprov.on_bi.bi_extended = syncprov_op_extended;
3241         syncprov.on_bi.bi_operational = syncprov_operational;
3242
3243         syncprov.on_bi.bi_cf_ocs = spocs;
3244
3245         generic_filter.f_desc = slap_schema.si_ad_objectClass;
3246
3247         rc = config_register_schema( spcfg, spocs );
3248         if ( rc ) return rc;
3249
3250         return overlay_register( &syncprov );
3251 }
3252
3253 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
3254 int
3255 init_module( int argc, char *argv[] )
3256 {
3257         return syncprov_initialize();
3258 }
3259 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
3260
3261 #endif /* defined(SLAPD_OVER_SYNCPROV) */