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 2004-2006 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 /* A modify request on a particular entry */
  32 typedef struct modinst {
  33         struct modinst *mi_next;
  34         Operation *mi_op;
  35 } modinst;
  36
  37 typedef struct modtarget {
  38         struct modinst *mt_mods;
  39         struct modinst *mt_tail;
  40         Operation *mt_op;
  41         ldap_pvt_thread_mutex_t mt_mutex;
  42 } modtarget;
  43
  44 /* A queued result of a persistent search */
  45 typedef struct syncres {
  46         struct syncres *s_next;
  47         struct berval s_dn;
  48         struct berval s_ndn;
  49         struct berval s_uuid;
  50         struct berval s_csn;
  51         char s_mode;
  52         char s_isreference;
  53 } syncres;
  54
  55 /* Record of a persistent search */
  56 typedef struct syncops {
  57         struct syncops *s_next;
  58         struct berval   s_base;         /* ndn of search base */
  59         ID              s_eid;          /* entryID of search base */
  60         Operation       *s_op;          /* search op */
  61         int             s_rid;
  62         struct berval s_filterstr;
  63         int             s_flags;        /* search status */
  64 #define PS_IS_REFRESHING        0x01
  65 #define PS_IS_DETACHED          0x02
  66 #define PS_WROTE_BASE           0x04
  67 #define PS_FIND_BASE            0x08
  68
  69         int             s_inuse;        /* reference count */
  70         struct syncres *s_res;
  71         struct syncres *s_restail;
  72         struct re_s     *s_qtask;       /* task for playing psearch responses */
  73 #define RUNQ_INTERVAL   36000   /* a long time */
  74         ldap_pvt_thread_mutex_t s_mutex;
  75 } syncops;
  76
  77 /* A received sync control */
  78 typedef struct sync_control {
  79         struct sync_cookie sr_state;
  80         int sr_rhint;
  81 } sync_control;
  82
  83 #if 0 /* moved back to slap.h */
  84 #define o_sync  o_ctrlflag[slap_cids.sc_LDAPsync]
  85 #endif
  86 /* o_sync_mode uses data bits of o_sync */
  87 #define o_sync_mode     o_ctrlflag[slap_cids.sc_LDAPsync]
  88
  89 #define SLAP_SYNC_NONE                                  (LDAP_SYNC_NONE<<SLAP_CONTROL_SHIFT)
  90 #define SLAP_SYNC_REFRESH                               (LDAP_SYNC_REFRESH_ONLY<<SLAP_CONTROL_SHIFT)
  91 #define SLAP_SYNC_PERSIST                               (LDAP_SYNC_RESERVED<<SLAP_CONTROL_SHIFT)
  92 #define SLAP_SYNC_REFRESH_AND_PERSIST   (LDAP_SYNC_REFRESH_AND_PERSIST<<SLAP_CONTROL_SHIFT)
  93
  94 /* Record of which searches matched at premodify step */
  95 typedef struct syncmatches {
  96         struct syncmatches *sm_next;
  97         syncops *sm_op;
  98 } syncmatches;
  99
 100 /* Session log data */
 101 typedef struct slog_entry {
 102         struct slog_entry *se_next;
 103         struct berval se_uuid;
 104         struct berval se_csn;
 105         ber_tag_t       se_tag;
 106 } slog_entry;
 107
 108 typedef struct sessionlog {
 109         struct berval   sl_mincsn;
 110         int             sl_num;
 111         int             sl_size;
 112         slog_entry *sl_head;
 113         slog_entry *sl_tail;
 114         ldap_pvt_thread_mutex_t sl_mutex;
 115 } sessionlog;
 116
 117 /* The main state for this overlay */
 118 typedef struct syncprov_info_t {
 119         syncops         *si_ops;
 120         struct berval   si_ctxcsn;      /* ldapsync context */
 121         int             si_chkops;      /* checkpointing info */
 122         int             si_chktime;
 123         int             si_numops;      /* number of ops since last checkpoint */
 124         int             si_nopres;      /* Skip present phase */
 125         int             si_usehint;     /* use reload hint */
 126         time_t  si_chklast;     /* time of last checkpoint */
 127         Avlnode *si_mods;       /* entries being modified */
 128         sessionlog      *si_logs;
 129         ldap_pvt_thread_mutex_t si_csn_mutex;
 130         ldap_pvt_thread_mutex_t si_ops_mutex;
 131         ldap_pvt_thread_mutex_t si_mods_mutex;
 132         char            si_ctxcsnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 133 } syncprov_info_t;
 134
 135 typedef struct opcookie {
 136         slap_overinst *son;
 137         syncmatches *smatches;
 138         struct berval sdn;      /* DN of entry, for deletes */
 139         struct berval sndn;
 140         struct berval suuid;    /* UUID of entry */
 141         struct berval sctxcsn;
 142         int sreference; /* Is the entry a reference? */
 143 } opcookie;
 144
 145 typedef struct fbase_cookie {
 146         struct berval *fdn;     /* DN of a modified entry, for scope testing */
 147         syncops *fss;   /* persistent search we're testing against */
 148         int fbase;      /* if TRUE we found the search base and it's still valid */
 149         int fscope;     /* if TRUE then fdn is within the psearch scope */
 150 } fbase_cookie;
 151
 152 static AttributeName csn_anlist[3];
 153 static AttributeName uuid_anlist[2];
 154
 155 /* Build a LDAPsync intermediate state control */
 156 static int
 157 syncprov_state_ctrl(
 158         Operation       *op,
 159         SlapReply       *rs,
 160         Entry           *e,
 161         int             entry_sync_state,
 162         LDAPControl     **ctrls,
 163         int             num_ctrls,
 164         int             send_cookie,
 165         struct berval   *cookie )
 166 {
 167         Attribute* a;
 168         int ret;
 169
 170         BerElementBuffer berbuf;
 171         BerElement *ber = (BerElement *)&berbuf;
 172
 173         struct berval   entryuuid_bv = BER_BVNULL;
 174
 175         ber_init2( ber, 0, LBER_USE_DER );
 176         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 177
 178         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 179
 180         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 181                 AttributeDescription *desc = a->a_desc;
 182                 if ( desc == slap_schema.si_ad_entryUUID ) {
 183                         entryuuid_bv = a->a_nvals[0];
 184                         break;
 185                 }
 186         }
 187
 188         /* FIXME: what if entryuuid is NULL or empty ? */
 189
 190         if ( send_cookie && cookie ) {
 191                 ber_printf( ber, "{eOON}",
 192                         entry_sync_state, &entryuuid_bv, cookie );
 193         } else {
 194                 ber_printf( ber, "{eON}",
 195                         entry_sync_state, &entryuuid_bv );
 196         }
 197
 198         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 199         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 200         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 201
 202         ber_free_buf( ber );
 203
 204         if ( ret < 0 ) {
 205                 Debug( LDAP_DEBUG_TRACE,
 206                         "slap_build_sync_ctrl: ber_flatten2 failed\n",
 207                         0, 0, 0 );
 208                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 209                 return ret;
 210         }
 211
 212         return LDAP_SUCCESS;
 213 }
 214
 215 /* Build a LDAPsync final state control */
 216 static int
 217 syncprov_done_ctrl(
 218         Operation       *op,
 219         SlapReply       *rs,
 220         LDAPControl     **ctrls,
 221         int                     num_ctrls,
 222         int                     send_cookie,
 223         struct berval *cookie,
 224         int                     refreshDeletes )
 225 {
 226         int ret;
 227         BerElementBuffer berbuf;
 228         BerElement *ber = (BerElement *)&berbuf;
 229
 230         ber_init2( ber, NULL, LBER_USE_DER );
 231         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 232
 233         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 234
 235         ber_printf( ber, "{" );
 236         if ( send_cookie && cookie ) {
 237                 ber_printf( ber, "O", cookie );
 238         }
 239         if ( refreshDeletes == LDAP_SYNC_REFRESH_DELETES ) {
 240                 ber_printf( ber, "b", refreshDeletes );
 241         }
 242         ber_printf( ber, "N}" );
 243
 244         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_DONE;
 245         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 246         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 247
 248         ber_free_buf( ber );
 249
 250         if ( ret < 0 ) {
 251                 Debug( LDAP_DEBUG_TRACE,
 252                         "syncprov_done_ctrl: ber_flatten2 failed\n",
 253                         0, 0, 0 );
 254                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 255                 return ret;
 256         }
 257
 258         return LDAP_SUCCESS;
 259 }
 260
 261 static int
 262 syncprov_sendinfo(
 263         Operation       *op,
 264         SlapReply       *rs,
 265         int                     type,
 266         struct berval *cookie,
 267         int                     refreshDone,
 268         BerVarray       syncUUIDs,
 269         int                     refreshDeletes )
 270 {
 271         BerElementBuffer berbuf;
 272         BerElement *ber = (BerElement *)&berbuf;
 273         struct berval rspdata;
 274
 275         int ret;
 276
 277         ber_init2( ber, NULL, LBER_USE_DER );
 278         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 279
 280         if ( type ) {
 281                 switch ( type ) {
 282                 case LDAP_TAG_SYNC_NEW_COOKIE:
 283                         ber_printf( ber, "tO", type, cookie );
 284                         break;
 285                 case LDAP_TAG_SYNC_REFRESH_DELETE:
 286                 case LDAP_TAG_SYNC_REFRESH_PRESENT:
 287                         ber_printf( ber, "t{", type );
 288                         if ( cookie ) {
 289                                 ber_printf( ber, "O", cookie );
 290                         }
 291                         if ( refreshDone == 0 ) {
 292                                 ber_printf( ber, "b", refreshDone );
 293                         }
 294                         ber_printf( ber, "N}" );
 295                         break;
 296                 case LDAP_TAG_SYNC_ID_SET:
 297                         ber_printf( ber, "t{", type );
 298                         if ( cookie ) {
 299                                 ber_printf( ber, "O", cookie );
 300                         }
 301                         if ( refreshDeletes == 1 ) {
 302                                 ber_printf( ber, "b", refreshDeletes );
 303                         }
 304                         ber_printf( ber, "[W]", syncUUIDs );
 305                         ber_printf( ber, "N}" );
 306                         break;
 307                 default:
 308                         Debug( LDAP_DEBUG_TRACE,
 309                                 "syncprov_sendinfo: invalid syncinfo type (%d)\n",
 310                                 type, 0, 0 );
 311                         return LDAP_OTHER;
 312                 }
 313         }
 314
 315         ret = ber_flatten2( ber, &rspdata, 0 );
 316
 317         if ( ret < 0 ) {
 318                 Debug( LDAP_DEBUG_TRACE,
 319                         "syncprov_sendinfo: ber_flatten2 failed\n",
 320                         0, 0, 0 );
 321                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 322                 return ret;
 323         }
 324
 325         rs->sr_rspoid = LDAP_SYNC_INFO;
 326         rs->sr_rspdata = &rspdata;
 327         send_ldap_intermediate( op, rs );
 328         rs->sr_rspdata = NULL;
 329         ber_free_buf( ber );
 330
 331         return LDAP_SUCCESS;
 332 }
 333
 334 /* Find a modtarget in an AVL tree */
 335 static int
 336 sp_avl_cmp( const void *c1, const void *c2 )
 337 {
 338         const modtarget *m1, *m2;
 339         int rc;
 340
 341         m1 = c1; m2 = c2;
 342         rc = m1->mt_op->o_req_ndn.bv_len - m2->mt_op->o_req_ndn.bv_len;
 343
 344         if ( rc ) return rc;
 345         return ber_bvcmp( &m1->mt_op->o_req_ndn, &m2->mt_op->o_req_ndn );
 346 }
 347
 348 /* syncprov_findbase:
 349  *   finds the true DN of the base of a search (with alias dereferencing) and
 350  * checks to make sure the base entry doesn't get replaced with a different
 351  * entry (e.g., swapping trees via ModDN, or retargeting an alias). If a
 352  * change is detected, any persistent search on this base must be terminated /
 353  * reloaded.
 354  *   On the first call, we just save the DN and entryID. On subsequent calls
 355  * we compare the DN and entryID with the saved values.
 356  */
 357 static int
 358 findbase_cb( Operation *op, SlapReply *rs )
 359 {
 360         slap_callback *sc = op->o_callback;
 361
 362         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 363                 fbase_cookie *fc = sc->sc_private;
 364
 365                 /* If no entryID, we're looking for the first time.
 366                  * Just store whatever we got.
 367                  */
 368                 if ( fc->fss->s_eid == NOID ) {
 369                         fc->fbase = 2;
 370                         fc->fss->s_eid = rs->sr_entry->e_id;
 371                         ber_dupbv( &fc->fss->s_base, &rs->sr_entry->e_nname );
 372
 373                 } else if ( rs->sr_entry->e_id == fc->fss->s_eid &&
 374                         dn_match( &rs->sr_entry->e_nname, &fc->fss->s_base )) {
 375
 376                 /* OK, the DN is the same and the entryID is the same. */
 377                         fc->fbase = 1;
 378                 }
 379         }
 380         if ( rs->sr_err != LDAP_SUCCESS ) {
 381                 Debug( LDAP_DEBUG_ANY, "findbase failed! %d\n", rs->sr_err,0,0 );
 382         }
 383         return LDAP_SUCCESS;
 384 }
 385
 386 static Filter generic_filter = { LDAP_FILTER_PRESENT, { 0 }, NULL };
 387 static struct berval generic_filterstr = BER_BVC("(objectclass=*)");
 388
 389 static int
 390 syncprov_findbase( Operation *op, fbase_cookie *fc )
 391 {
 392         opcookie *opc = op->o_callback->sc_private;
 393         slap_overinst *on = opc->son;
 394
 395         /* Use basic parameters from syncrepl search, but use
 396          * current op's threadctx / tmpmemctx
 397          */
 398         ldap_pvt_thread_mutex_lock( &fc->fss->s_mutex );
 399         if ( fc->fss->s_flags & PS_FIND_BASE ) {
 400                 slap_callback cb = {0};
 401                 Operation fop;
 402                 SlapReply frs = { REP_RESULT };
 403                 int rc;
 404
 405                 fc->fss->s_flags ^= PS_FIND_BASE;
 406                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 407
 408                 fop = *fc->fss->s_op;
 409
 410                 fop.o_hdr = op->o_hdr;
 411                 fop.o_bd = op->o_bd;
 412                 fop.o_time = op->o_time;
 413                 fop.o_tincr = op->o_tincr;
 414
 415                 cb.sc_response = findbase_cb;
 416                 cb.sc_private = fc;
 417
 418                 fop.o_sync_mode = 0;    /* turn off sync mode */
 419                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 420                 fop.o_callback = &cb;
 421                 fop.o_tag = LDAP_REQ_SEARCH;
 422                 fop.ors_scope = LDAP_SCOPE_BASE;
 423                 fop.ors_limit = NULL;
 424                 fop.ors_slimit = 1;
 425                 fop.ors_tlimit = SLAP_NO_LIMIT;
 426                 fop.ors_attrs = slap_anlist_no_attrs;
 427                 fop.ors_attrsonly = 1;
 428                 fop.ors_filter = &generic_filter;
 429                 fop.ors_filterstr = generic_filterstr;
 430
 431                 fop.o_bd->bd_info = on->on_info->oi_orig;
 432                 rc = fop.o_bd->be_search( &fop, &frs );
 433                 fop.o_bd->bd_info = (BackendInfo *)on;
 434         } else {
 435                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 436                 fc->fbase = 1;
 437         }
 438
 439         /* After the first call, see if the fdn resides in the scope */
 440         if ( fc->fbase == 1 ) {
 441                 switch ( fc->fss->s_op->ors_scope ) {
 442                 case LDAP_SCOPE_BASE:
 443                         fc->fscope = dn_match( fc->fdn, &fc->fss->s_base );
 444                         break;
 445                 case LDAP_SCOPE_ONELEVEL: {
 446                         struct berval pdn;
 447                         dnParent( fc->fdn, &pdn );
 448                         fc->fscope = dn_match( &pdn, &fc->fss->s_base );
 449                         break; }
 450                 case LDAP_SCOPE_SUBTREE:
 451                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base );
 452                         break;
 453                 case LDAP_SCOPE_SUBORDINATE:
 454                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base ) &&
 455                                 !dn_match( fc->fdn, &fc->fss->s_base );
 456                         break;
 457                 }
 458         }
 459
 460         if ( fc->fbase )
 461                 return LDAP_SUCCESS;
 462
 463         /* If entryID has changed, then the base of this search has
 464          * changed. Invalidate the psearch.
 465          */
 466         return LDAP_NO_SUCH_OBJECT;
 467 }
 468
 469 /* syncprov_findcsn:
 470  *   This function has three different purposes, but they all use a search
 471  * that filters on entryCSN so they're combined here.
 472  * 1: at startup time, after a contextCSN has been read from the database,
 473  * we search for all entries with CSN >= contextCSN in case the contextCSN
 474  * was not checkpointed at the previous shutdown.
 475  *
 476  * 2: when the current contextCSN is known and we have a sync cookie, we search
 477  * for one entry with CSN = the cookie CSN. If not found, try <= cookie CSN.
 478  * If an entry is found, the cookie CSN is valid, otherwise it is stale.
 479  *
 480  * 3: during a refresh phase, we search for all entries with CSN <= the cookie
 481  * CSN, and generate Present records for them. We always collect this result
 482  * in SyncID sets, even if there's only one match.
 483  */
 484 typedef enum find_csn_t {
 485         FIND_MAXCSN     = 1,
 486         FIND_CSN        = 2,
 487         FIND_PRESENT    = 3
 488 } find_csn_t;
 489
 490 static int
 491 findmax_cb( Operation *op, SlapReply *rs )
 492 {
 493         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 494                 struct berval *maxcsn = op->o_callback->sc_private;
 495                 Attribute *a = attr_find( rs->sr_entry->e_attrs,
 496                         slap_schema.si_ad_entryCSN );
 497
 498                 if ( a && ber_bvcmp( &a->a_vals[0], maxcsn ) > 0 ) {
 499                         maxcsn->bv_len = a->a_vals[0].bv_len;
 500                         strcpy( maxcsn->bv_val, a->a_vals[0].bv_val );
 501                 }
 502         }
 503         return LDAP_SUCCESS;
 504 }
 505
 506 static int
 507 findcsn_cb( Operation *op, SlapReply *rs )
 508 {
 509         slap_callback *sc = op->o_callback;
 510
 511         /* We just want to know that at least one exists, so it's OK if
 512          * we exceed the unchecked limit.
 513          */
 514         if ( rs->sr_err == LDAP_ADMINLIMIT_EXCEEDED ||
 515                 (rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS )) {
 516                 sc->sc_private = (void *)1;
 517         }
 518         return LDAP_SUCCESS;
 519 }
 520
 521 /* Build a list of entryUUIDs for sending in a SyncID set */
 522
 523 #define UUID_LEN        16
 524
 525 typedef struct fpres_cookie {
 526         int num;
 527         BerVarray uuids;
 528         char *last;
 529 } fpres_cookie;
 530
 531 static int
 532 findpres_cb( Operation *op, SlapReply *rs )
 533 {
 534         slap_callback *sc = op->o_callback;
 535         fpres_cookie *pc = sc->sc_private;
 536         Attribute *a;
 537         int ret = SLAP_CB_CONTINUE;
 538
 539         switch ( rs->sr_type ) {
 540         case REP_SEARCH:
 541                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryUUID );
 542                 if ( a ) {
 543                         pc->uuids[pc->num].bv_val = pc->last;
 544                         AC_MEMCPY( pc->uuids[pc->num].bv_val, a->a_nvals[0].bv_val,
 545                                 pc->uuids[pc->num].bv_len );
 546                         pc->num++;
 547                         pc->last = pc->uuids[pc->num].bv_val;
 548                         pc->uuids[pc->num].bv_val = NULL;
 549                 }
 550                 ret = LDAP_SUCCESS;
 551                 if ( pc->num != SLAP_SYNCUUID_SET_SIZE )
 552                         break;
 553                 /* FALLTHRU */
 554         case REP_RESULT:
 555                 ret = rs->sr_err;
 556                 if ( pc->num ) {
 557                         ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 558                                 0, pc->uuids, 0 );
 559                         pc->uuids[pc->num].bv_val = pc->last;
 560                         pc->num = 0;
 561                         pc->last = pc->uuids[0].bv_val;
 562                 }
 563                 break;
 564         default:
 565                 break;
 566         }
 567         return ret;
 568 }
 569
 570 static int
 571 syncprov_findcsn( Operation *op, find_csn_t mode )
 572 {
 573         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 574         syncprov_info_t         *si = on->on_bi.bi_private;
 575
 576         slap_callback cb = {0};
 577         Operation fop;
 578         SlapReply frs = { REP_RESULT };
 579         char buf[LDAP_LUTIL_CSNSTR_BUFSIZE + STRLENOF("(entryCSN<=)")];
 580         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 581         struct berval maxcsn;
 582         Filter cf, af;
 583 #ifdef LDAP_COMP_MATCH
 584         AttributeAssertion eq = { NULL, BER_BVNULL, NULL };
 585 #else
 586         AttributeAssertion eq = { NULL, BER_BVNULL };
 587 #endif
 588         fpres_cookie pcookie;
 589         sync_control *srs = NULL;
 590         struct slap_limits_set fc_limits;
 591         int i, rc = LDAP_SUCCESS, findcsn_retry = 1;
 592
 593         if ( mode != FIND_MAXCSN ) {
 594                 srs = op->o_controls[slap_cids.sc_LDAPsync];
 595
 596                 if ( srs->sr_state.ctxcsn.bv_len >= LDAP_LUTIL_CSNSTR_BUFSIZE ) {
 597                         return LDAP_OTHER;
 598                 }
 599         }
 600
 601         fop = *op;
 602         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync_mode */
 603         /* We want pure entries, not referrals */
 604         fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 605
 606         cf.f_ava = &eq;
 607         cf.f_av_desc = slap_schema.si_ad_entryCSN;
 608         cf.f_next = NULL;
 609
 610         fop.o_callback = &cb;
 611         fop.ors_limit = NULL;
 612         fop.ors_tlimit = SLAP_NO_LIMIT;
 613         fop.ors_filter = &cf;
 614         fop.ors_filterstr.bv_val = buf;
 615
 616 again:
 617         switch( mode ) {
 618         case FIND_MAXCSN:
 619                 cf.f_choice = LDAP_FILTER_GE;
 620                 cf.f_av_value = si->si_ctxcsn;
 621                 fop.ors_filterstr.bv_len = sprintf( buf, "(entryCSN>=%s)",
 622                         cf.f_av_value.bv_val );
 623                 fop.ors_attrsonly = 0;
 624                 fop.ors_attrs = csn_anlist;
 625                 fop.ors_slimit = SLAP_NO_LIMIT;
 626                 cb.sc_private = &maxcsn;
 627                 cb.sc_response = findmax_cb;
 628                 strcpy( cbuf, si->si_ctxcsn.bv_val );
 629                 maxcsn.bv_val = cbuf;
 630                 maxcsn.bv_len = si->si_ctxcsn.bv_len;
 631                 break;
 632         case FIND_CSN:
 633                 cf.f_av_value = srs->sr_state.ctxcsn;
 634                 /* Look for exact match the first time */
 635                 if ( findcsn_retry ) {
 636                         cf.f_choice = LDAP_FILTER_EQUALITY;
 637                         fop.ors_filterstr.bv_len = sprintf( buf, "(entryCSN=%s)",
 638                                 cf.f_av_value.bv_val );
 639                 /* On retry, look for <= */
 640                 } else {
 641                         cf.f_choice = LDAP_FILTER_LE;
 642                         fop.ors_limit = &fc_limits;
 643                         fc_limits.lms_s_unchecked = 1;
 644                         fop.ors_filterstr.bv_len = sprintf( buf, "(entryCSN<=%s)",
 645                                 cf.f_av_value.bv_val );
 646                 }
 647                 fop.ors_attrsonly = 1;
 648                 fop.ors_attrs = slap_anlist_no_attrs;
 649                 fop.ors_slimit = 1;
 650                 cb.sc_private = NULL;
 651                 cb.sc_response = findcsn_cb;
 652                 break;
 653         case FIND_PRESENT:
 654                 af.f_choice = LDAP_FILTER_AND;
 655                 af.f_next = NULL;
 656                 af.f_and = &cf;
 657                 cf.f_choice = LDAP_FILTER_LE;
 658                 cf.f_av_value = srs->sr_state.ctxcsn;
 659                 cf.f_next = op->ors_filter;
 660                 fop.ors_filter = &af;
 661                 filter2bv_x( &fop, fop.ors_filter, &fop.ors_filterstr );
 662                 fop.ors_attrsonly = 0;
 663                 fop.ors_attrs = uuid_anlist;
 664                 fop.ors_slimit = SLAP_NO_LIMIT;
 665                 cb.sc_private = &pcookie;
 666                 cb.sc_response = findpres_cb;
 667                 pcookie.num = 0;
 668
 669                 /* preallocate storage for a full set */
 670                 pcookie.uuids = op->o_tmpalloc( (SLAP_SYNCUUID_SET_SIZE+1) *
 671                         sizeof(struct berval) + SLAP_SYNCUUID_SET_SIZE * UUID_LEN,
 672                         op->o_tmpmemctx );
 673                 pcookie.last = (char *)(pcookie.uuids + SLAP_SYNCUUID_SET_SIZE+1);
 674                 pcookie.uuids[0].bv_val = pcookie.last;
 675                 pcookie.uuids[0].bv_len = UUID_LEN;
 676                 for (i=1; i<SLAP_SYNCUUID_SET_SIZE; i++) {
 677                         pcookie.uuids[i].bv_val = pcookie.uuids[i-1].bv_val + UUID_LEN;
 678                         pcookie.uuids[i].bv_len = UUID_LEN;
 679                 }
 680                 break;
 681         }
 682
 683         fop.o_bd->bd_info = on->on_info->oi_orig;
 684         fop.o_bd->be_search( &fop, &frs );
 685         fop.o_bd->bd_info = (BackendInfo *)on;
 686
 687         switch( mode ) {
 688         case FIND_MAXCSN:
 689                 strcpy( si->si_ctxcsnbuf, maxcsn.bv_val );
 690                 si->si_ctxcsn.bv_len = maxcsn.bv_len;
 691                 break;
 692         case FIND_CSN:
 693                 /* If matching CSN was not found, invalidate the context. */
 694                 if ( !cb.sc_private ) {
 695                         /* If we didn't find an exact match, then try for <= */
 696                         if ( findcsn_retry ) {
 697                                 findcsn_retry = 0;
 698                                 goto again;
 699                         }
 700                         rc = LDAP_NO_SUCH_OBJECT;
 701                 }
 702                 break;
 703         case FIND_PRESENT:
 704                 op->o_tmpfree( pcookie.uuids, op->o_tmpmemctx );
 705                 op->o_tmpfree( fop.ors_filterstr.bv_val, op->o_tmpmemctx );
 706                 break;
 707         }
 708
 709         return rc;
 710 }
 711
 712 static void
 713 syncprov_free_syncop( syncops *so )
 714 {
 715         syncres *sr, *srnext;
 716         GroupAssertion *ga, *gnext;
 717
 718         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 719         if ( --so->s_inuse > 0 ) {
 720                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 721                 return;
 722         }
 723         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 724         if ( so->s_flags & PS_IS_DETACHED ) {
 725                 filter_free( so->s_op->ors_filter );
 726                 for ( ga = so->s_op->o_groups; ga; ga=gnext ) {
 727                         gnext = ga->ga_next;
 728                         ch_free( ga );
 729                 }
 730                 ch_free( so->s_op );
 731         }
 732         ch_free( so->s_base.bv_val );
 733         for ( sr=so->s_res; sr; sr=srnext ) {
 734                 srnext = sr->s_next;
 735                 ch_free( sr );
 736         }
 737         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 738         ch_free( so );
 739 }
 740
 741 /* Send a persistent search response */
 742 static int
 743 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so,
 744         Entry **e, int mode )
 745 {
 746         slap_overinst *on = opc->son;
 747
 748         SlapReply rs = { REP_SEARCH };
 749         LDAPControl *ctrls[2];
 750         struct berval cookie;
 751         Entry e_uuid = {0};
 752         Attribute a_uuid = {0};
 753
 754         if ( so->s_op->o_abandon )
 755                 return SLAPD_ABANDON;
 756
 757         ctrls[1] = NULL;
 758         slap_compose_sync_cookie( op, &cookie, &opc->sctxcsn, so->s_rid );
 759
 760         e_uuid.e_attrs = &a_uuid;
 761         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 762         a_uuid.a_nvals = &opc->suuid;
 763         rs.sr_err = syncprov_state_ctrl( op, &rs, &e_uuid,
 764                 mode, ctrls, 0, 1, &cookie );
 765         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
 766
 767         rs.sr_ctrls = ctrls;
 768         op->o_bd->bd_info = (BackendInfo *)on->on_info;
 769         switch( mode ) {
 770         case LDAP_SYNC_ADD:
 771                 rs.sr_entry = *e;
 772                 if ( rs.sr_entry->e_private )
 773                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 774                 if ( opc->sreference ) {
 775                         rs.sr_ref = get_entry_referrals( op, rs.sr_entry );
 776                         send_search_reference( op, &rs );
 777                         ber_bvarray_free( rs.sr_ref );
 778                         if ( !rs.sr_entry )
 779                                 *e = NULL;
 780                         break;
 781                 }
 782                 /* fallthru */
 783         case LDAP_SYNC_MODIFY:
 784                 rs.sr_entry = *e;
 785                 if ( rs.sr_entry->e_private )
 786                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 787                 rs.sr_attrs = op->ors_attrs;
 788                 send_search_entry( op, &rs );
 789                 if ( !rs.sr_entry )
 790                         *e = NULL;
 791                 break;
 792         case LDAP_SYNC_DELETE:
 793                 e_uuid.e_attrs = NULL;
 794                 e_uuid.e_name = opc->sdn;
 795                 e_uuid.e_nname = opc->sndn;
 796                 rs.sr_entry = &e_uuid;
 797                 if ( opc->sreference ) {
 798                         struct berval bv = BER_BVNULL;
 799                         rs.sr_ref = &bv;
 800                         send_search_reference( op, &rs );
 801                 } else {
 802                         send_search_entry( op, &rs );
 803                 }
 804                 break;
 805         default:
 806                 assert(0);
 807         }
 808         /* In case someone else freed it already? */
 809         if ( rs.sr_ctrls ) {
 810                 op->o_tmpfree( rs.sr_ctrls[0], op->o_tmpmemctx );
 811                 rs.sr_ctrls = NULL;
 812         }
 813
 814         return rs.sr_err;
 815 }
 816
 817 /* Play back queued responses */
 818 static int
 819 syncprov_qplay( Operation *op, slap_overinst *on, syncops *so )
 820 {
 821         syncres *sr;
 822         Entry *e;
 823         opcookie opc;
 824         int rc = 0;
 825
 826         opc.son = on;
 827         op->o_bd->bd_info = (BackendInfo *)on->on_info;
 828
 829         for (;;) {
 830                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 831                 sr = so->s_res;
 832                 if ( sr )
 833                         so->s_res = sr->s_next;
 834                 if ( !so->s_res )
 835                         so->s_restail = NULL;
 836                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 837
 838                 if ( !sr || so->s_op->o_abandon )
 839                         break;
 840
 841                 opc.sdn = sr->s_dn;
 842                 opc.sndn = sr->s_ndn;
 843                 opc.suuid = sr->s_uuid;
 844                 opc.sctxcsn = sr->s_csn;
 845                 opc.sreference = sr->s_isreference;
 846                 e = NULL;
 847
 848                 if ( sr->s_mode != LDAP_SYNC_DELETE ) {
 849                         rc = be_entry_get_rw( op, &opc.sndn, NULL, NULL, 0, &e );
 850                         if ( rc ) {
 851                                 ch_free( sr );
 852                                 continue;
 853                         }
 854                 }
 855                 rc = syncprov_sendresp( op, &opc, so, &e, sr->s_mode );
 856
 857                 if ( e ) {
 858                         be_entry_release_rw( op, e, 0 );
 859                 }
 860
 861                 ch_free( sr );
 862
 863                 if ( rc )
 864                         break;
 865         }
 866         op->o_bd->bd_info = (BackendInfo *)on;
 867         return rc;
 868 }
 869
 870 /* runqueue task for playing back queued responses */
 871 static void *
 872 syncprov_qtask( void *ctx, void *arg )
 873 {
 874         struct re_s *rtask = arg;
 875         syncops *so = rtask->arg;
 876         slap_overinst *on = so->s_op->o_private;
 877         OperationBuffer opbuf;
 878         Operation *op;
 879         BackendDB be;
 880
 881         op = (Operation *) &opbuf;
 882         *op = *so->s_op;
 883         op->o_hdr = (Opheader *)(op+1);
 884         op->o_controls = (void **)(op->o_hdr+1);
 885         memset( op->o_controls, 0, SLAP_MAX_CIDS * sizeof(void *));
 886
 887         *op->o_hdr = *so->s_op->o_hdr;
 888
 889         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx);
 890         op->o_tmpmfuncs = &slap_sl_mfuncs;
 891         op->o_threadctx = ctx;
 892
 893         /* syncprov_qplay expects a fake db */
 894         be = *so->s_op->o_bd;
 895         be.be_flags |= SLAP_DBFLAG_OVERLAY;
 896         op->o_bd = &be;
 897         op->o_private = NULL;
 898         op->o_callback = NULL;
 899
 900         (void)syncprov_qplay( op, on, so );
 901
 902         /* decrement use count... */
 903         syncprov_free_syncop( so );
 904
 905         /* wait until we get explicitly scheduled again */
 906         ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
 907         ldap_pvt_runqueue_stoptask( &slapd_rq, so->s_qtask );
 908         ldap_pvt_runqueue_resched( &slapd_rq, so->s_qtask, 1 );
 909         ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
 910
 911         return NULL;
 912 }
 913
 914 /* Start the task to play back queued psearch responses */
 915 static void
 916 syncprov_qstart( syncops *so )
 917 {
 918         int wake=0;
 919         ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
 920         if ( !so->s_qtask ) {
 921                 so->s_qtask = ldap_pvt_runqueue_insert( &slapd_rq, RUNQ_INTERVAL,
 922                         syncprov_qtask, so, "syncprov_qtask",
 923                         so->s_op->o_conn->c_peer_name.bv_val );
 924                 ++so->s_inuse;
 925                 wake = 1;
 926         } else {
 927                 if (!ldap_pvt_runqueue_isrunning( &slapd_rq, so->s_qtask ) &&
 928                         !so->s_qtask->next_sched.tv_sec ) {
 929                         so->s_qtask->interval.tv_sec = 0;
 930                         ldap_pvt_runqueue_resched( &slapd_rq, so->s_qtask, 0 );
 931                         so->s_qtask->interval.tv_sec = RUNQ_INTERVAL;
 932                         ++so->s_inuse;
 933                         wake = 1;
 934                 }
 935         }
 936         ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
 937         if ( wake )
 938                 slap_wake_listener();
 939 }
 940
 941 /* Queue a persistent search response */
 942 static int
 943 syncprov_qresp( opcookie *opc, syncops *so, int mode )
 944 {
 945         syncres *sr;
 946
 947         sr = ch_malloc(sizeof(syncres) + opc->suuid.bv_len + 1 +
 948                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1 + opc->sctxcsn.bv_len + 1 );
 949         sr->s_next = NULL;
 950         sr->s_dn.bv_val = (char *)(sr + 1);
 951         sr->s_dn.bv_len = opc->sdn.bv_len;
 952         sr->s_mode = mode;
 953         sr->s_isreference = opc->sreference;
 954         sr->s_ndn.bv_val = lutil_strcopy( sr->s_dn.bv_val,
 955                  opc->sdn.bv_val ) + 1;
 956         sr->s_ndn.bv_len = opc->sndn.bv_len;
 957         sr->s_uuid.bv_val = lutil_strcopy( sr->s_ndn.bv_val,
 958                  opc->sndn.bv_val ) + 1;
 959         sr->s_uuid.bv_len = opc->suuid.bv_len;
 960         AC_MEMCPY( sr->s_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
 961         sr->s_csn.bv_val = sr->s_uuid.bv_val + sr->s_uuid.bv_len + 1;
 962         sr->s_csn.bv_len = opc->sctxcsn.bv_len;
 963         strcpy( sr->s_csn.bv_val, opc->sctxcsn.bv_val );
 964
 965         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 966         if ( !so->s_res ) {
 967                 so->s_res = sr;
 968         } else {
 969                 so->s_restail->s_next = sr;
 970         }
 971         so->s_restail = sr;
 972
 973         /* If the base of the psearch was modified, check it next time round */
 974         if ( so->s_flags & PS_WROTE_BASE ) {
 975                 so->s_flags ^= PS_WROTE_BASE;
 976                 so->s_flags |= PS_FIND_BASE;
 977         }
 978         if ( so->s_flags & PS_IS_DETACHED ) {
 979                 syncprov_qstart( so );
 980         }
 981         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 982         return LDAP_SUCCESS;
 983 }
 984
 985 static int
 986 syncprov_drop_psearch( syncops *so, int lock )
 987 {
 988         if ( so->s_flags & PS_IS_DETACHED ) {
 989                 if ( lock )
 990                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
 991                 so->s_op->o_conn->c_n_ops_executing--;
 992                 so->s_op->o_conn->c_n_ops_completed++;
 993                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, slap_op,
 994                         o_next );
 995                 if ( lock )
 996                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
 997         }
 998         syncprov_free_syncop( so );
 999
1000         return 0;
1001 }
1002
1003 static int
1004 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
1005 {
1006         slap_callback *sc = op->o_callback;
1007         op->o_callback = sc->sc_next;
1008         syncprov_drop_psearch( op->o_callback->sc_private, 0 );
1009         op->o_tmpfree( sc, op->o_tmpmemctx );
1010         return 0;
1011 }
1012
1013 static int
1014 syncprov_op_abandon( Operation *op, SlapReply *rs )
1015 {
1016         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1017         syncprov_info_t         *si = on->on_bi.bi_private;
1018         syncops *so, *soprev;
1019
1020         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1021         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
1022                 soprev=so, so=so->s_next ) {
1023                 if ( so->s_op->o_connid == op->o_connid &&
1024                         so->s_op->o_msgid == op->orn_msgid ) {
1025                                 so->s_op->o_abandon = 1;
1026                                 soprev->s_next = so->s_next;
1027                                 break;
1028                 }
1029         }
1030         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1031         if ( so ) {
1032                 /* Is this really a Cancel exop? */
1033                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
1034                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
1035                         rs->sr_err = LDAP_CANCELLED;
1036                         send_ldap_result( so->s_op, rs );
1037                         if ( so->s_flags & PS_IS_DETACHED ) {
1038                                 slap_callback *cb;
1039                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
1040                                 cb->sc_cleanup = syncprov_ab_cleanup;
1041                                 cb->sc_next = op->o_callback;
1042                                 cb->sc_private = so;
1043                                 return SLAP_CB_CONTINUE;
1044                         }
1045                 }
1046                 syncprov_drop_psearch( so, 0 );
1047         }
1048         return SLAP_CB_CONTINUE;
1049 }
1050
1051 /* Find which persistent searches are affected by this operation */
1052 static void
1053 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
1054 {
1055         slap_overinst *on = opc->son;
1056         syncprov_info_t         *si = on->on_bi.bi_private;
1057
1058         fbase_cookie fc;
1059         syncops *ss, *sprev, *snext;
1060         Entry *e;
1061         Attribute *a;
1062         int rc;
1063         struct berval newdn;
1064         int freefdn = 0;
1065         BackendDB *b0 = op->o_bd, db;
1066
1067         fc.fdn = &op->o_req_ndn;
1068         /* compute new DN */
1069         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1070                 struct berval pdn;
1071                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
1072                 else dnParent( fc.fdn, &pdn );
1073                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
1074                 fc.fdn = &newdn;
1075                 freefdn = 1;
1076         }
1077         if ( op->o_tag != LDAP_REQ_ADD ) {
1078                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1079                         db = *op->o_bd;
1080                         op->o_bd = &db;
1081                 }
1082                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
1083                 rc = be_entry_get_rw( op, fc.fdn, NULL, NULL, 0, &e );
1084                 /* If we're sending responses now, make a copy and unlock the DB */
1085                 if ( e && !saveit ) {
1086                         Entry *e2 = entry_dup( e );
1087                         be_entry_release_rw( op, e, 0 );
1088                         e = e2;
1089                 }
1090                 op->o_bd->bd_info = (BackendInfo *)on;
1091                 if ( rc ) {
1092                         op->o_bd = b0;
1093                         return;
1094                 }
1095         } else {
1096                 e = op->ora_e;
1097         }
1098
1099         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1100                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1101                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1102                 opc->sreference = is_entry_referral( e );
1103                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1104                 if ( a )
1105                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1106         } else if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1107                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1108                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1109                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1110                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1111         }
1112
1113         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1114         for (ss = si->si_ops, sprev = (syncops *)&si->si_ops; ss;
1115                 sprev = ss, ss=snext)
1116         {
1117                 syncmatches *sm;
1118                 int found = 0;
1119
1120                 snext = ss->s_next;
1121                 /* validate base */
1122                 fc.fss = ss;
1123                 fc.fbase = 0;
1124                 fc.fscope = 0;
1125
1126                 /* If the base of the search is missing, signal a refresh */
1127                 rc = syncprov_findbase( op, &fc );
1128                 if ( rc != LDAP_SUCCESS ) {
1129                         SlapReply rs = {REP_RESULT};
1130                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1131                                 "search base has changed" );
1132                         sprev->s_next = snext;
1133                         syncprov_drop_psearch( ss, 1 );
1134                         ss = sprev;
1135                         continue;
1136                 }
1137
1138
1139                 /* If we're sending results now, look for this op in old matches */
1140                 if ( !saveit ) {
1141                         syncmatches *old;
1142
1143                         /* Did we modify the search base? */
1144                         if ( dn_match( &op->o_req_ndn, &ss->s_base )) {
1145                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1146                                 ss->s_flags |= PS_WROTE_BASE;
1147                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1148                         }
1149
1150                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1151                                 old=sm, sm=sm->sm_next ) {
1152                                 if ( sm->sm_op == ss ) {
1153                                         found = 1;
1154                                         old->sm_next = sm->sm_next;
1155                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1156                                         break;
1157                                 }
1158                         }
1159                 }
1160
1161                 /* check if current o_req_dn is in scope and matches filter */
1162                 if ( fc.fscope && test_filter( op, e, ss->s_op->ors_filter ) ==
1163                         LDAP_COMPARE_TRUE ) {
1164                         if ( saveit ) {
1165                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1166                                 sm->sm_next = opc->smatches;
1167                                 sm->sm_op = ss;
1168                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1169                                 ++ss->s_inuse;
1170                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1171                                 opc->smatches = sm;
1172                         } else {
1173                                 /* if found send UPDATE else send ADD */
1174                                 syncprov_qresp( opc, ss,
1175                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD );
1176                         }
1177                 } else if ( !saveit && found ) {
1178                         /* send DELETE */
1179                         syncprov_qresp( opc, ss, LDAP_SYNC_DELETE );
1180                 }
1181         }
1182         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1183
1184         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1185                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
1186                 be_entry_release_rw( op, e, 0 );
1187                 op->o_bd->bd_info = (BackendInfo *)on;
1188         }
1189         if ( freefdn ) {
1190                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1191         }
1192         op->o_bd = b0;
1193 }
1194
1195 static int
1196 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1197 {
1198         slap_callback *cb = op->o_callback;
1199         opcookie *opc = cb->sc_private;
1200         slap_overinst *on = opc->son;
1201         syncprov_info_t         *si = on->on_bi.bi_private;
1202         syncmatches *sm, *snext;
1203         modtarget *mt, mtdummy;
1204
1205         for (sm = opc->smatches; sm; sm=snext) {
1206                 snext = sm->sm_next;
1207                 syncprov_free_syncop( sm->sm_op );
1208                 op->o_tmpfree( sm, op->o_tmpmemctx );
1209         }
1210
1211         /* Remove op from lock table */
1212         mtdummy.mt_op = op;
1213         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1214         mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1215         if ( mt ) {
1216                 modinst *mi = mt->mt_mods;
1217
1218                 /* If there are more, promote the next one */
1219                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1220                 if ( mi->mi_next ) {
1221                         mt->mt_mods = mi->mi_next;
1222                         mt->mt_op = mt->mt_mods->mi_op;
1223                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1224                 } else {
1225                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1226                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1227                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1228                         ch_free( mt );
1229                 }
1230         }
1231         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1232         if ( !BER_BVISNULL( &opc->suuid ))
1233                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1234         if ( !BER_BVISNULL( &opc->sndn ))
1235                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1236         if ( !BER_BVISNULL( &opc->sdn ))
1237                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1238         op->o_callback = cb->sc_next;
1239         op->o_tmpfree(cb, op->o_tmpmemctx);
1240
1241         return 0;
1242 }
1243
1244 static void
1245 syncprov_checkpoint( Operation *op, SlapReply *rs, slap_overinst *on )
1246 {
1247         syncprov_info_t         *si = on->on_bi.bi_private;
1248         Modifications mod;
1249         Operation opm;
1250         SlapReply rsm = { 0 };
1251         struct berval bv[2];
1252         slap_callback cb = {0};
1253
1254         /* If ctxcsn is empty, delete it */
1255         if ( BER_BVISEMPTY( &si->si_ctxcsn )) {
1256                 mod.sml_values = NULL;
1257         } else {
1258                 mod.sml_values = bv;
1259                 bv[1].bv_val = NULL;
1260                 bv[0] = si->si_ctxcsn;
1261         }
1262         mod.sml_nvalues = NULL;
1263         mod.sml_desc = slap_schema.si_ad_contextCSN;
1264         mod.sml_op = LDAP_MOD_REPLACE;
1265         mod.sml_flags = 0;
1266         mod.sml_next = NULL;
1267
1268         cb.sc_response = slap_null_cb;
1269         opm = *op;
1270         opm.o_tag = LDAP_REQ_MODIFY;
1271         opm.o_callback = &cb;
1272         opm.orm_modlist = &mod;
1273         opm.o_req_dn = op->o_bd->be_suffix[0];
1274         opm.o_req_ndn = op->o_bd->be_nsuffix[0];
1275         opm.o_bd->bd_info = on->on_info->oi_orig;
1276         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1277         SLAP_DBFLAGS( opm.o_bd ) |= SLAP_DBFLAG_NOLASTMOD;
1278         opm.o_bd->be_modify( &opm, &rsm );
1279         SLAP_DBFLAGS( opm.o_bd ) ^= SLAP_DBFLAG_NOLASTMOD;
1280         if ( mod.sml_next != NULL ) {
1281                 slap_mods_free( mod.sml_next, 1 );
1282         }
1283 }
1284
1285 static void
1286 syncprov_add_slog( Operation *op )
1287 {
1288         opcookie *opc = op->o_callback->sc_private;
1289         slap_overinst *on = opc->son;
1290         syncprov_info_t         *si = on->on_bi.bi_private;
1291         sessionlog *sl;
1292         slog_entry *se;
1293
1294         sl = si->si_logs;
1295         {
1296                 /* Allocate a record. UUIDs are not NUL-terminated. */
1297                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1298                         op->o_csn.bv_len + 1 );
1299                 se->se_next = NULL;
1300                 se->se_tag = op->o_tag;
1301
1302                 se->se_uuid.bv_val = (char *)(&se[1]);
1303                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1304                 se->se_uuid.bv_len = opc->suuid.bv_len;
1305
1306                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1307                 AC_MEMCPY( se->se_csn.bv_val, op->o_csn.bv_val, op->o_csn.bv_len );
1308                 se->se_csn.bv_val[op->o_csn.bv_len] = '\0';
1309                 se->se_csn.bv_len = op->o_csn.bv_len;
1310
1311                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1312                 if ( sl->sl_head ) {
1313                         sl->sl_tail->se_next = se;
1314                 } else {
1315                         sl->sl_head = se;
1316                 }
1317                 sl->sl_tail = se;
1318                 sl->sl_num++;
1319                 while ( sl->sl_num > sl->sl_size ) {
1320                         se = sl->sl_head;
1321                         sl->sl_head = se->se_next;
1322                         strcpy( sl->sl_mincsn.bv_val, se->se_csn.bv_val );
1323                         sl->sl_mincsn.bv_len = se->se_csn.bv_len;
1324                         ch_free( se );
1325                         sl->sl_num--;
1326                 }
1327                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1328         }
1329 }
1330
1331 /* Just set a flag if we found the matching entry */
1332 static int
1333 playlog_cb( Operation *op, SlapReply *rs )
1334 {
1335         if ( rs->sr_type == REP_SEARCH ) {
1336                 op->o_callback->sc_private = (void *)1;
1337         }
1338         return rs->sr_err;
1339 }
1340
1341 /* enter with sl->sl_mutex locked, release before returning */
1342 static void
1343 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1344         sync_control *srs, struct berval *ctxcsn )
1345 {
1346         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1347         slog_entry *se;
1348         int i, j, ndel, num, nmods, mmods;
1349         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1350         BerVarray uuids;
1351         struct berval delcsn;
1352
1353         if ( !sl->sl_num ) {
1354                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1355                 return;
1356         }
1357
1358         num = sl->sl_num;
1359         i = 0;
1360         nmods = 0;
1361
1362         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1363                 num * UUID_LEN, op->o_tmpmemctx );
1364         uuids[0].bv_val = (char *)(uuids + num + 1);
1365
1366         delcsn.bv_len = 0;
1367         delcsn.bv_val = cbuf;
1368
1369         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1370          * and everything else at the end. Do this first so we can
1371          * unlock the list mutex.
1372          */
1373         for ( se=sl->sl_head; se; se=se->se_next ) {
1374                 if ( ber_bvcmp( &se->se_csn, &srs->sr_state.ctxcsn ) <= 0 ) continue;
1375                 if ( ber_bvcmp( &se->se_csn, ctxcsn ) > 0 ) break;
1376                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1377                         j = i;
1378                         i++;
1379                         AC_MEMCPY( cbuf, se->se_csn.bv_val, se->se_csn.bv_len );
1380                         delcsn.bv_len = se->se_csn.bv_len;
1381                         delcsn.bv_val[delcsn.bv_len] = '\0';
1382                 } else {
1383                         nmods++;
1384                         j = num - nmods;
1385                 }
1386                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1387                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1388                 uuids[j].bv_len = UUID_LEN;
1389         }
1390         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1391
1392         ndel = i;
1393
1394         /* Zero out unused slots */
1395         for ( i=ndel; i < num - nmods; i++ )
1396                 uuids[i].bv_len = 0;
1397
1398         /* Mods must be validated to see if they belong in this delete set.
1399          */
1400
1401         mmods = nmods;
1402         /* Strip any duplicates */
1403         for ( i=0; i<nmods; i++ ) {
1404                 for ( j=0; j<ndel; j++ ) {
1405                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1406                                 uuids[num - 1 - i].bv_len = 0;
1407                                 mmods --;
1408                                 break;
1409                         }
1410                 }
1411                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1412                 for ( j=0; j<i; j++ ) {
1413                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1414                                 uuids[num - 1 - i].bv_len = 0;
1415                                 mmods --;
1416                                 break;
1417                         }
1418                 }
1419         }
1420
1421         if ( mmods ) {
1422                 Operation fop;
1423                 SlapReply frs = { REP_RESULT };
1424                 int rc;
1425                 Filter mf, af;
1426 #ifdef LDAP_COMP_MATCH
1427                 AttributeAssertion eq = { NULL, BER_BVNULL, NULL };
1428 #else
1429                 AttributeAssertion eq;
1430 #endif
1431                 slap_callback cb = {0};
1432
1433                 fop = *op;
1434
1435                 fop.o_sync_mode = 0;
1436                 fop.o_callback = &cb;
1437                 fop.ors_limit = NULL;
1438                 fop.ors_tlimit = SLAP_NO_LIMIT;
1439                 fop.ors_attrs = slap_anlist_all_attributes;
1440                 fop.ors_attrsonly = 0;
1441                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1442
1443                 af.f_choice = LDAP_FILTER_AND;
1444                 af.f_next = NULL;
1445                 af.f_and = &mf;
1446                 mf.f_choice = LDAP_FILTER_EQUALITY;
1447                 mf.f_ava = &eq;
1448                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1449                 mf.f_next = fop.ors_filter;
1450
1451                 fop.ors_filter = &af;
1452
1453                 cb.sc_response = playlog_cb;
1454                 fop.o_bd->bd_info = on->on_info->oi_orig;
1455
1456                 for ( i=ndel; i<num; i++ ) {
1457                         if ( uuids[i].bv_len == 0 ) continue;
1458
1459                         mf.f_av_value = uuids[i];
1460                         cb.sc_private = NULL;
1461                         fop.ors_slimit = 1;
1462                         frs.sr_nentries = 0;
1463                         rc = fop.o_bd->be_search( &fop, &frs );
1464
1465                         /* If entry was not found, add to delete list */
1466                         if ( !cb.sc_private ) {
1467                                 uuids[ndel++] = uuids[i];
1468                         }
1469                 }
1470                 fop.o_bd->bd_info = (BackendInfo *)on;
1471         }
1472         if ( ndel ) {
1473                 struct berval cookie;
1474
1475                 slap_compose_sync_cookie( op, &cookie, &delcsn, srs->sr_state.rid );
1476                 uuids[ndel].bv_val = NULL;
1477                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, &cookie, 0, uuids, 1 );
1478                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1479         }
1480         op->o_tmpfree( uuids, op->o_tmpmemctx );
1481 }
1482
1483 static int
1484 syncprov_op_response( Operation *op, SlapReply *rs )
1485 {
1486         opcookie *opc = op->o_callback->sc_private;
1487         slap_overinst *on = opc->son;
1488         syncprov_info_t         *si = on->on_bi.bi_private;
1489         syncmatches *sm;
1490
1491         if ( rs->sr_err == LDAP_SUCCESS )
1492         {
1493                 struct berval maxcsn = BER_BVNULL;
1494                 char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1495
1496                 /* Update our context CSN */
1497                 cbuf[0] = '\0';
1498                 ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1499                 slap_get_commit_csn( op, &maxcsn );
1500                 if ( !BER_BVISNULL( &maxcsn ) ) {
1501                         strcpy( cbuf, maxcsn.bv_val );
1502                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn ) > 0 ) {
1503                                 strcpy( si->si_ctxcsnbuf, cbuf );
1504                                 si->si_ctxcsn.bv_len = maxcsn.bv_len;
1505                         }
1506                 }
1507
1508                 /* Don't do any processing for consumer contextCSN updates */
1509                 if ( SLAP_SYNC_SHADOW( op->o_bd ) &&
1510                         op->o_msgid == SLAP_SYNC_UPDATE_MSGID ) {
1511                         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1512                         return SLAP_CB_CONTINUE;
1513                 }
1514
1515                 si->si_numops++;
1516                 if ( si->si_chkops || si->si_chktime ) {
1517                         int do_check=0;
1518                         if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1519                                 do_check = 1;
1520                                 si->si_numops = 0;
1521                         }
1522                         if ( si->si_chktime &&
1523                                 (op->o_time - si->si_chklast >= si->si_chktime )) {
1524                                 do_check = 1;
1525                                 si->si_chklast = op->o_time;
1526                         }
1527                         if ( do_check ) {
1528                                 syncprov_checkpoint( op, rs, on );
1529                         }
1530                 }
1531                 ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1532
1533                 opc->sctxcsn.bv_len = maxcsn.bv_len;
1534                 opc->sctxcsn.bv_val = cbuf;
1535
1536                 /* Handle any persistent searches */
1537                 if ( si->si_ops ) {
1538                         switch(op->o_tag) {
1539                         case LDAP_REQ_ADD:
1540                         case LDAP_REQ_MODIFY:
1541                         case LDAP_REQ_MODRDN:
1542                         case LDAP_REQ_EXTENDED:
1543                                 syncprov_matchops( op, opc, 0 );
1544                                 break;
1545                         case LDAP_REQ_DELETE:
1546                                 /* for each match in opc->smatches:
1547                                  *   send DELETE msg
1548                                  */
1549                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1550                                         if ( sm->sm_op->s_op->o_abandon )
1551                                                 continue;
1552                                         syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_DELETE );
1553                                 }
1554                                 break;
1555                         }
1556                 }
1557
1558                 /* Add any log records */
1559                 if ( si->si_logs && op->o_tag != LDAP_REQ_ADD ) {
1560                         syncprov_add_slog( op );
1561                 }
1562
1563         }
1564         return SLAP_CB_CONTINUE;
1565 }
1566
1567 /* We don't use a subentry to store the context CSN any more.
1568  * We expose the current context CSN as an operational attribute
1569  * of the suffix entry.
1570  */
1571 static int
1572 syncprov_op_compare( Operation *op, SlapReply *rs )
1573 {
1574         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1575         syncprov_info_t         *si = on->on_bi.bi_private;
1576         int rc = SLAP_CB_CONTINUE;
1577
1578         if ( dn_match( &op->o_req_ndn, op->o_bd->be_nsuffix ) &&
1579                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1580         {
1581                 Entry e = {0};
1582                 Attribute a = {0};
1583                 struct berval bv[2];
1584
1585                 e.e_name = op->o_bd->be_suffix[0];
1586                 e.e_nname = op->o_bd->be_nsuffix[0];
1587
1588                 BER_BVZERO( &bv[1] );
1589                 bv[0] = si->si_ctxcsn;
1590
1591                 a.a_desc = slap_schema.si_ad_contextCSN;
1592                 a.a_vals = bv;
1593                 a.a_nvals = a.a_vals;
1594
1595                 ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1596
1597                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1598                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1599                 if ( ! rs->sr_err ) {
1600                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1601                         goto return_results;
1602                 }
1603
1604                 if ( get_assert( op ) &&
1605                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
1606                 {
1607                         rs->sr_err = LDAP_ASSERTION_FAILED;
1608                         goto return_results;
1609                 }
1610
1611
1612                 rs->sr_err = LDAP_COMPARE_FALSE;
1613
1614                 if ( value_find_ex( op->oq_compare.rs_ava->aa_desc,
1615                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
1616                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
1617                                 a.a_nvals, &op->oq_compare.rs_ava->aa_value, op->o_tmpmemctx ) == 0 )
1618                 {
1619                         rs->sr_err = LDAP_COMPARE_TRUE;
1620                 }
1621
1622 return_results:;
1623
1624                 ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1625
1626                 send_ldap_result( op, rs );
1627
1628                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
1629                         rs->sr_err = LDAP_SUCCESS;
1630                 }
1631                 rc = rs->sr_err;
1632         }
1633
1634         return rc;
1635 }
1636
1637 static int
1638 syncprov_op_mod( Operation *op, SlapReply *rs )
1639 {
1640         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1641         syncprov_info_t         *si = on->on_bi.bi_private;
1642
1643         slap_callback *cb = op->o_tmpcalloc(1, sizeof(slap_callback)+
1644                 sizeof(opcookie) +
1645                 (si->si_ops ? sizeof(modinst) : 0 ),
1646                 op->o_tmpmemctx);
1647         opcookie *opc = (opcookie *)(cb+1);
1648         opc->son = on;
1649         cb->sc_response = syncprov_op_response;
1650         cb->sc_cleanup = syncprov_op_cleanup;
1651         cb->sc_private = opc;
1652         cb->sc_next = op->o_callback;
1653         op->o_callback = cb;
1654
1655         /* If there are active persistent searches, lock this operation.
1656          * See seqmod.c for the locking logic on its own.
1657          */
1658         if ( si->si_ops ) {
1659                 modtarget *mt, mtdummy;
1660                 modinst *mi;
1661
1662                 mi = (modinst *)(opc+1);
1663                 mi->mi_op = op;
1664
1665                 /* See if we're already modifying this entry... */
1666                 mtdummy.mt_op = op;
1667                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1668                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1669                 if ( mt ) {
1670                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1671                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1672                         mt->mt_tail->mi_next = mi;
1673                         mt->mt_tail = mi;
1674                         /* wait for this op to get to head of list */
1675                         while ( mt->mt_mods != mi ) {
1676                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1677                                 ldap_pvt_thread_yield();
1678                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1679
1680                                 /* clean up if the caller is giving up */
1681                                 if ( op->o_abandon ) {
1682                                         modinst *m2;
1683                                         for ( m2 = mt->mt_mods; m2->mi_next != mi;
1684                                                 m2 = m2->mi_next );
1685                                         m2->mi_next = mi->mi_next;
1686                                         if ( mt->mt_tail == mi ) mt->mt_tail = m2;
1687                                         op->o_tmpfree( cb, op->o_tmpmemctx );
1688                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1689                                         return SLAPD_ABANDON;
1690                                 }
1691                         }
1692                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1693                 } else {
1694                         /* Record that we're modifying this entry now */
1695                         mt = ch_malloc( sizeof(modtarget) );
1696                         mt->mt_mods = mi;
1697                         mt->mt_tail = mi;
1698                         mt->mt_op = mi->mi_op;
1699                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
1700                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
1701                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1702                 }
1703         }
1704
1705         if (( si->si_ops || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
1706                 syncprov_matchops( op, opc, 1 );
1707
1708         return SLAP_CB_CONTINUE;
1709 }
1710
1711 static int
1712 syncprov_op_extended( Operation *op, SlapReply *rs )
1713 {
1714         if ( exop_is_write( op ))
1715                 return syncprov_op_mod( op, rs );
1716
1717         return SLAP_CB_CONTINUE;
1718 }
1719
1720 typedef struct searchstate {
1721         slap_overinst *ss_on;
1722         syncops *ss_so;
1723         int ss_present;
1724         struct berval ss_ctxcsn;
1725         char ss_csnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1726 } searchstate;
1727
1728 static int
1729 syncprov_search_cleanup( Operation *op, SlapReply *rs )
1730 {
1731         if ( rs->sr_ctrls ) {
1732                 op->o_tmpfree( rs->sr_ctrls[0], op->o_tmpmemctx );
1733                 op->o_tmpfree( rs->sr_ctrls, op->o_tmpmemctx );
1734                 rs->sr_ctrls = NULL;
1735         }
1736         return 0;
1737 }
1738
1739 static void
1740 syncprov_detach_op( Operation *op, syncops *so, slap_overinst *on )
1741 {
1742         Operation *op2;
1743         int i, alen = 0;
1744         size_t size;
1745         char *ptr;
1746         GroupAssertion *g1, *g2;
1747
1748         /* count the search attrs */
1749         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1750                 alen += op->ors_attrs[i].an_name.bv_len + 1;
1751         }
1752         /* Make a new copy of the operation */
1753         size = sizeof(Operation) + sizeof(Opheader) +
1754                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
1755                 op->o_req_dn.bv_len + 1 +
1756                 op->o_req_ndn.bv_len + 1 +
1757                 op->o_ndn.bv_len + 1 +
1758                 so->s_filterstr.bv_len + 1;
1759         op2 = (Operation *)ch_calloc( 1, size );
1760         op2->o_hdr = (Opheader *)(op2+1);
1761
1762         /* Copy the fields we care about explicitly, leave the rest alone */
1763         *op2->o_hdr = *op->o_hdr;
1764         op2->o_tag = op->o_tag;
1765         op2->o_time = op->o_time;
1766         op2->o_bd = on->on_info->oi_origdb;
1767         op2->o_request = op->o_request;
1768         op2->o_private = on;
1769
1770         if ( i ) {
1771                 op2->ors_attrs = (AttributeName *)(op2->o_hdr + 1);
1772                 ptr = (char *)(op2->ors_attrs+i+1);
1773                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1774                         op2->ors_attrs[i] = op->ors_attrs[i];
1775                         op2->ors_attrs[i].an_name.bv_val = ptr;
1776                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
1777                 }
1778                 BER_BVZERO( &op2->ors_attrs[i].an_name );
1779         } else {
1780                 ptr = (char *)(op2->o_hdr + 1);
1781         }
1782         op2->o_authz = op->o_authz;
1783         op2->o_ndn.bv_val = ptr;
1784         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
1785         op2->o_dn = op2->o_ndn;
1786         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
1787         op2->o_req_dn.bv_val = ptr;
1788         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
1789         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
1790         op2->o_req_ndn.bv_val = ptr;
1791         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
1792         op2->ors_filterstr.bv_val = ptr;
1793         strcpy( ptr, so->s_filterstr.bv_val );
1794         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
1795         op2->ors_filter = filter_dup( op->ors_filter, NULL );
1796         so->s_op = op2;
1797
1798         /* Copy any cached group ACLs individually */
1799         op2->o_groups = NULL;
1800         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
1801                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
1802                 *g2 = *g1;
1803                 strcpy( g2->ga_ndn, g1->ga_ndn );
1804                 g2->ga_next = op2->o_groups;
1805                 op2->o_groups = g2;
1806         }
1807         /* Don't allow any further group caching */
1808         op2->o_do_not_cache = 1;
1809
1810         /* Add op2 to conn so abandon will find us */
1811         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
1812         op->o_conn->c_n_ops_executing++;
1813         op->o_conn->c_n_ops_completed--;
1814         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
1815         so->s_flags |= PS_IS_DETACHED;
1816         ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
1817
1818         /* Prevent anyone else from trying to send a result for this op */
1819         op->o_abandon = 1;
1820 }
1821
1822 static int
1823 syncprov_search_response( Operation *op, SlapReply *rs )
1824 {
1825         searchstate *ss = op->o_callback->sc_private;
1826         slap_overinst *on = ss->ss_on;
1827         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
1828
1829         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
1830                 Attribute *a;
1831                 /* If we got a referral without a referral object, there's
1832                  * something missing that we cannot replicate. Just ignore it.
1833                  * The consumer will abort because we didn't send the expected
1834                  * control.
1835                  */
1836                 if ( !rs->sr_entry ) {
1837                         assert( rs->sr_entry != NULL );
1838                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
1839                         return SLAP_CB_CONTINUE;
1840                 }
1841                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryCSN );
1842                 if ( a == NULL && rs->sr_operational_attrs != NULL ) {
1843                         a = attr_find( rs->sr_operational_attrs, slap_schema.si_ad_entryCSN );
1844                 }
1845                 if ( a ) {
1846                         /* Make sure entry is less than the snapshot'd contextCSN */
1847                         if ( ber_bvcmp( &a->a_nvals[0], &ss->ss_ctxcsn ) > 0 ) {
1848                                 Debug( LDAP_DEBUG_SYNC, "Entry %s CSN %s greater than snapshot %s\n",
1849                                         rs->sr_entry->e_name.bv_val,
1850                                         a->a_nvals[0].bv_val,
1851                                         ss->ss_ctxcsn.bv_val );
1852                                 return LDAP_SUCCESS;
1853                         }
1854
1855                         /* Don't send the ctx entry twice */
1856                         if ( !BER_BVISNULL( &srs->sr_state.ctxcsn ) &&
1857                                 bvmatch( &a->a_nvals[0], &srs->sr_state.ctxcsn ) ) {
1858                                 Debug( LDAP_DEBUG_SYNC, "Entry %s CSN %s matches ctx %s\n",
1859                                         rs->sr_entry->e_name.bv_val,
1860                                         a->a_nvals[0].bv_val,
1861                                         srs->sr_state.ctxcsn.bv_val );
1862                                 return LDAP_SUCCESS;
1863                         }
1864                 }
1865                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1866                         op->o_tmpmemctx );
1867                 rs->sr_ctrls[1] = NULL;
1868                 rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
1869                         LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
1870         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
1871                 struct berval cookie;
1872
1873                 slap_compose_sync_cookie( op, &cookie, &ss->ss_ctxcsn,
1874                         srs->sr_state.rid );
1875
1876                 /* Is this a regular refresh? */
1877                 if ( !ss->ss_so ) {
1878                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1879                                 op->o_tmpmemctx );
1880                         rs->sr_ctrls[1] = NULL;
1881                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
1882                                 0, 1, &cookie, ss->ss_present ?  LDAP_SYNC_REFRESH_PRESENTS :
1883                                         LDAP_SYNC_REFRESH_DELETES );
1884                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1885                 } else {
1886                 /* It's RefreshAndPersist, transition to Persist phase */
1887                         syncprov_sendinfo( op, rs, ss->ss_present ?
1888                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
1889                                 &cookie, 1, NULL, 0 );
1890                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1891
1892                         /* Detach this Op from frontend control */
1893                         ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
1894
1895                         /* Turn off the refreshing flag */
1896                         ss->ss_so->s_flags ^= PS_IS_REFRESHING;
1897
1898                         syncprov_detach_op( op, ss->ss_so, on );
1899
1900                         /* If there are queued responses, fire them off */
1901                         if ( ss->ss_so->s_res )
1902                                 syncprov_qstart( ss->ss_so );
1903                         ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
1904
1905                         return LDAP_SUCCESS;
1906                 }
1907         }
1908
1909         return SLAP_CB_CONTINUE;
1910 }
1911
1912 static int
1913 syncprov_op_search( Operation *op, SlapReply *rs )
1914 {
1915         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1916         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
1917         slap_callback   *cb;
1918         int gotstate = 0, nochange = 0, do_present;
1919         syncops *sop = NULL;
1920         searchstate *ss;
1921         sync_control *srs;
1922         struct berval ctxcsn;
1923         char csnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1924
1925         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
1926
1927         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
1928                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
1929                 return rs->sr_err;
1930         }
1931
1932         do_present = si->si_nopres ? 0 : 1;
1933
1934         srs = op->o_controls[slap_cids.sc_LDAPsync];
1935         op->o_managedsait = SLAP_CONTROL_NONCRITICAL;
1936
1937         /* If this is a persistent search, set it up right away */
1938         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
1939                 syncops so = {0};
1940                 fbase_cookie fc;
1941                 opcookie opc;
1942                 slap_callback sc;
1943
1944                 fc.fss = &so;
1945                 fc.fbase = 0;
1946                 so.s_eid = NOID;
1947                 so.s_op = op;
1948                 so.s_flags = PS_IS_REFRESHING | PS_FIND_BASE;
1949                 /* syncprov_findbase expects to be called as a callback... */
1950                 sc.sc_private = &opc;
1951                 opc.son = on;
1952                 ldap_pvt_thread_mutex_init( &so.s_mutex );
1953                 cb = op->o_callback;
1954                 op->o_callback = &sc;
1955                 rs->sr_err = syncprov_findbase( op, &fc );
1956                 op->o_callback = cb;
1957                 ldap_pvt_thread_mutex_destroy( &so.s_mutex );
1958
1959                 if ( rs->sr_err != LDAP_SUCCESS ) {
1960                         send_ldap_result( op, rs );
1961                         return rs->sr_err;
1962                 }
1963                 sop = ch_malloc( sizeof( syncops ));
1964                 *sop = so;
1965                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
1966                 sop->s_rid = srs->sr_state.rid;
1967                 sop->s_inuse = 1;
1968
1969                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1970                 sop->s_next = si->si_ops;
1971                 si->si_ops = sop;
1972                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1973         }
1974
1975         /* snapshot the ctxcsn */
1976         ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1977         strcpy( csnbuf, si->si_ctxcsnbuf );
1978         ctxcsn.bv_len = si->si_ctxcsn.bv_len;
1979         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1980         ctxcsn.bv_val = csnbuf;
1981
1982         /* If we have a cookie, handle the PRESENT lookups */
1983         if ( !BER_BVISNULL( &srs->sr_state.ctxcsn )) {
1984                 sessionlog *sl;
1985
1986                 /* The cookie was validated when it was parsed, just use it */
1987
1988                 /* If just Refreshing and nothing has changed, shortcut it */
1989                 if ( bvmatch( &srs->sr_state.ctxcsn, &ctxcsn )) {
1990                         nochange = 1;
1991                         if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
1992                                 LDAPControl     *ctrls[2];
1993
1994                                 ctrls[0] = NULL;
1995                                 ctrls[1] = NULL;
1996                                 syncprov_done_ctrl( op, rs, ctrls, 0, 0,
1997                                         NULL, LDAP_SYNC_REFRESH_DELETES );
1998                                 rs->sr_ctrls = ctrls;
1999                                 rs->sr_err = LDAP_SUCCESS;
2000                                 send_ldap_result( op, rs );
2001                                 rs->sr_ctrls = NULL;
2002                                 return rs->sr_err;
2003                         }
2004                         goto shortcut;
2005                 }
2006                 /* Do we have a sessionlog for this search? */
2007                 sl=si->si_logs;
2008                 if ( sl ) {
2009                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
2010                         /* Are there any log entries, and is the consumer state
2011                          * present in the session log?
2012                          */
2013                         if ( sl->sl_num > 0 && ber_bvcmp( &srs->sr_state.ctxcsn, &sl->sl_mincsn ) >= 0 ) {
2014                                 do_present = 0;
2015                                 /* mutex is unlocked in playlog */
2016                                 syncprov_playlog( op, rs, sl, srs, &ctxcsn );
2017                         } else {
2018                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
2019                         }
2020                 }
2021                 /* Is the CSN still present in the database? */
2022                 if ( syncprov_findcsn( op, FIND_CSN ) != LDAP_SUCCESS ) {
2023                         /* No, so a reload is required */
2024                         /* the 2.2 consumer doesn't send this hint */
2025                         if ( si->si_usehint && srs->sr_rhint == 0 ) {
2026                                 send_ldap_error( op, rs, LDAP_SYNC_REFRESH_REQUIRED, "sync cookie is stale" );
2027                                 return rs->sr_err;
2028                         }
2029                 } else {
2030                         gotstate = 1;
2031                         /* If changed and doing Present lookup, send Present UUIDs */
2032                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT ) !=
2033                                 LDAP_SUCCESS ) {
2034                                 send_ldap_result( op, rs );
2035                                 return rs->sr_err;
2036                         }
2037                 }
2038         }
2039
2040 shortcut:
2041         /* Append CSN range to search filter, save original filter
2042          * for persistent search evaluation
2043          */
2044         if ( sop ) {
2045                 sop->s_filterstr= op->ors_filterstr;
2046         }
2047
2048         /* If something changed, find the changes */
2049         if ( gotstate && !nochange ) {
2050                 Filter *fand, *fava;
2051
2052                 fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2053                 fand->f_choice = LDAP_FILTER_AND;
2054                 fand->f_next = NULL;
2055                 fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2056                 fand->f_and = fava;
2057                 fava->f_choice = LDAP_FILTER_GE;
2058                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
2059                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
2060 #ifdef LDAP_COMP_MATCH
2061                 fava->f_ava->aa_cf = NULL;
2062 #endif
2063                 ber_dupbv_x( &fava->f_ava->aa_value, &srs->sr_state.ctxcsn, op->o_tmpmemctx );
2064                 fava->f_next = op->ors_filter;
2065                 op->ors_filter = fand;
2066                 filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
2067         }
2068
2069         /* Let our callback add needed info to returned entries */
2070         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
2071         ss = (searchstate *)(cb+1);
2072         ss->ss_on = on;
2073         ss->ss_so = sop;
2074         ss->ss_present = do_present;
2075         ss->ss_ctxcsn.bv_len = ctxcsn.bv_len;
2076         ss->ss_ctxcsn.bv_val = ss->ss_csnbuf;
2077         strcpy( ss->ss_ctxcsn.bv_val, ctxcsn.bv_val );
2078         cb->sc_response = syncprov_search_response;
2079         cb->sc_cleanup = syncprov_search_cleanup;
2080         cb->sc_private = ss;
2081         cb->sc_next = op->o_callback;
2082         op->o_callback = cb;
2083
2084 #if 0   /* I don't think we need to shortcircuit back-bdb any more */
2085         op->o_sync_mode &= SLAP_CONTROL_MASK;
2086 #endif
2087
2088         /* If this is a persistent search and no changes were reported during
2089          * the refresh phase, just invoke the response callback to transition
2090          * us into persist phase
2091          */
2092         if ( nochange ) {
2093                 rs->sr_err = LDAP_SUCCESS;
2094                 rs->sr_nentries = 0;
2095                 send_ldap_result( op, rs );
2096                 return rs->sr_err;
2097         }
2098         return SLAP_CB_CONTINUE;
2099 }
2100
2101 static int
2102 syncprov_operational(
2103         Operation *op,
2104         SlapReply *rs )
2105 {
2106         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2107         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2108
2109         if ( rs->sr_entry &&
2110                 dn_match( &rs->sr_entry->e_nname, op->o_bd->be_nsuffix )) {
2111
2112                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
2113                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
2114                         Attribute *a, **ap = NULL;
2115
2116                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
2117                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
2118                                         break;
2119                         }
2120
2121                         if ( !a ) {
2122                                 for ( ap = &rs->sr_operational_attrs; *ap; ap=&(*ap)->a_next );
2123
2124                                 a = ch_malloc( sizeof(Attribute));
2125                                 a->a_desc = slap_schema.si_ad_contextCSN;
2126                                 a->a_vals = ch_malloc( 2 * sizeof(struct berval));
2127                                 a->a_vals[1].bv_val = NULL;
2128                                 a->a_nvals = a->a_vals;
2129                                 a->a_next = NULL;
2130                                 a->a_flags = 0;
2131                                 *ap = a;
2132                         }
2133
2134                         ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
2135                         if ( !ap ) {
2136                                 strcpy( a->a_vals[0].bv_val, si->si_ctxcsnbuf );
2137                         } else {
2138                                 ber_dupbv( &a->a_vals[0], &si->si_ctxcsn );
2139                         }
2140                         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
2141                 }
2142         }
2143         return SLAP_CB_CONTINUE;
2144 }
2145
2146 enum {
2147         SP_CHKPT = 1,
2148         SP_SESSL,
2149         SP_NOPRES,
2150         SP_USEHINT
2151 };
2152
2153 static ConfigDriver sp_cf_gen;
2154
2155 static ConfigTable spcfg[] = {
2156         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2157                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2158                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2159                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2160         { "syncprov-sessionlog", "ops", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2161                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2162                         "DESC 'Session log size in ops' "
2163                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2164         { "syncprov-nopresent", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_NOPRES,
2165                 sp_cf_gen, "( OLcfgOvAt:1.3 NAME 'olcSpNoPresent' "
2166                         "DESC 'Omit Present phase processing' "
2167                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2168         { "syncprov-reloadhint", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_USEHINT,
2169                 sp_cf_gen, "( OLcfgOvAt:1.4 NAME 'olcSpReloadHint' "
2170                         "DESC 'Observe Reload Hint in Request control' "
2171                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2172         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2173 };
2174
2175 static ConfigOCs spocs[] = {
2176         { "( OLcfgOvOc:1.1 "
2177                 "NAME 'olcSyncProvConfig' "
2178                 "DESC 'SyncRepl Provider configuration' "
2179                 "SUP olcOverlayConfig "
2180                 "MAY ( olcSpCheckpoint $ olcSpSessionlog $ olcSpNoPresent ) )",
2181                         Cft_Overlay, spcfg },
2182         { NULL, 0, NULL }
2183 };
2184
2185 static int
2186 sp_cf_gen(ConfigArgs *c)
2187 {
2188         slap_overinst           *on = (slap_overinst *)c->bi;
2189         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2190         int rc = 0;
2191
2192         if ( c->op == SLAP_CONFIG_EMIT ) {
2193                 switch ( c->type ) {
2194                 case SP_CHKPT:
2195                         if ( si->si_chkops || si->si_chktime ) {
2196                                 struct berval bv;
2197                                 bv.bv_len = sprintf( c->msg, "%d %d",
2198                                         si->si_chkops, si->si_chktime );
2199                                 bv.bv_val = c->msg;
2200                                 value_add_one( &c->rvalue_vals, &bv );
2201                         } else {
2202                                 rc = 1;
2203                         }
2204                         break;
2205                 case SP_SESSL:
2206                         if ( si->si_logs ) {
2207                                 c->value_int = si->si_logs->sl_size;
2208                         } else {
2209                                 rc = 1;
2210                         }
2211                         break;
2212                 case SP_NOPRES:
2213                         if ( si->si_nopres ) {
2214                                 c->value_int = 1;
2215                         } else {
2216                                 rc = 1;
2217                         }
2218                         break;
2219                 case SP_USEHINT:
2220                         if ( si->si_usehint ) {
2221                                 c->value_int = 1;
2222                         } else {
2223                                 rc = 1;
2224                         }
2225                         break;
2226                 }
2227                 return rc;
2228         } else if ( c->op == LDAP_MOD_DELETE ) {
2229                 switch ( c->type ) {
2230                 case SP_CHKPT:
2231                         si->si_chkops = 0;
2232                         si->si_chktime = 0;
2233                         break;
2234                 case SP_SESSL:
2235                         if ( si->si_logs )
2236                                 si->si_logs->sl_size = 0;
2237                         else
2238                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2239                         break;
2240                 case SP_NOPRES:
2241                         if ( si->si_nopres )
2242                                 si->si_nopres = 0;
2243                         else
2244                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2245                         break;
2246                 case SP_USEHINT:
2247                         if ( si->si_usehint )
2248                                 si->si_usehint = 0;
2249                         else
2250                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2251                         break;
2252                 }
2253                 return rc;
2254         }
2255         switch ( c->type ) {
2256         case SP_CHKPT:
2257                 if ( lutil_atoi( &si->si_chkops, c->argv[1] ) != 0 ) {
2258                         sprintf( c->msg, "%s unable to parse checkpoint ops # \"%s\"",
2259                                 c->argv[0], c->argv[1] );
2260                         Debug( LDAP_DEBUG_CONFIG, "%s: %s\n", c->log, c->msg, 0 );
2261                         return ARG_BAD_CONF;
2262                 }
2263                 if ( si->si_chkops <= 0 ) {
2264                         sprintf( c->msg, "%s invalid checkpoint ops # \"%d\"",
2265                                 c->argv[0], si->si_chkops );
2266                         Debug( LDAP_DEBUG_CONFIG, "%s: %s\n", c->log, c->msg, 0 );
2267                         return ARG_BAD_CONF;
2268                 }
2269                 if ( lutil_atoi( &si->si_chktime, c->argv[2] ) != 0 ) {
2270                         sprintf( c->msg, "%s unable to parse checkpoint time \"%s\"",
2271                                 c->argv[0], c->argv[1] );
2272                         Debug( LDAP_DEBUG_CONFIG, "%s: %s\n", c->log, c->msg, 0 );
2273                         return ARG_BAD_CONF;
2274                 }
2275                 if ( si->si_chktime <= 0 ) {
2276                         sprintf( c->msg, "%s invalid checkpoint time \"%d\"",
2277                                 c->argv[0], si->si_chkops );
2278                         Debug( LDAP_DEBUG_CONFIG, "%s: %s\n", c->log, c->msg, 0 );
2279                         return ARG_BAD_CONF;
2280                 }
2281                 si->si_chktime *= 60;
2282                 break;
2283         case SP_SESSL: {
2284                 sessionlog *sl;
2285                 int size = c->value_int;
2286
2287                 if ( size < 0 ) {
2288                         sprintf( c->msg, "%s size %d is negative",
2289                                 c->argv[0], size );
2290                         Debug( LDAP_DEBUG_CONFIG, "%s: %s\n", c->log, c->msg, 0 );
2291                         return ARG_BAD_CONF;
2292                 }
2293                 sl = si->si_logs;
2294                 if ( !sl ) {
2295                         sl = ch_malloc( sizeof( sessionlog ) + LDAP_LUTIL_CSNSTR_BUFSIZE );
2296                         sl->sl_mincsn.bv_val = (char *)(sl+1);
2297                         sl->sl_mincsn.bv_len = 0;
2298                         sl->sl_num = 0;
2299                         sl->sl_head = sl->sl_tail = NULL;
2300                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
2301                         si->si_logs = sl;
2302                 }
2303                 sl->sl_size = size;
2304                 }
2305                 break;
2306         case SP_NOPRES:
2307                 si->si_nopres = c->value_int;
2308                 break;
2309         case SP_USEHINT:
2310                 si->si_usehint = c->value_int;
2311                 break;
2312         }
2313         return rc;
2314 }
2315
2316 /* ITS#3456 we cannot run this search on the main thread, must use a
2317  * child thread in order to insure we have a big enough stack.
2318  */
2319 static void *
2320 syncprov_db_otask(
2321         void *ptr
2322 )
2323 {
2324         syncprov_findcsn( ptr, FIND_MAXCSN );
2325         return NULL;
2326 }
2327
2328 /* Read any existing contextCSN from the underlying db.
2329  * Then search for any entries newer than that. If no value exists,
2330  * just generate it. Cache whatever result.
2331  */
2332 static int
2333 syncprov_db_open(
2334     BackendDB *be
2335 )
2336 {
2337         slap_overinst   *on = (slap_overinst *) be->bd_info;
2338         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2339
2340         Connection conn = { 0 };
2341         OperationBuffer opbuf = { 0 };
2342         char ctxcsnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
2343         Operation *op = (Operation *) &opbuf;
2344         Entry *e;
2345         Attribute *a;
2346         int rc;
2347         void *thrctx = NULL;
2348
2349         if ( !SLAP_LASTMOD( be )) {
2350                 Debug( LDAP_DEBUG_ANY,
2351                         "syncprov_db_open: invalid config, lastmod must be enabled\n", 0, 0, 0 );
2352                 return -1;
2353         }
2354
2355         if ( slapMode & SLAP_TOOL_MODE ) {
2356                 return 0;
2357         }
2358
2359         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
2360         if ( rc ) {
2361                 return rc;
2362         }
2363
2364         thrctx = ldap_pvt_thread_pool_context();
2365         connection_fake_init( &conn, op, thrctx );
2366         op->o_bd = be;
2367         op->o_dn = be->be_rootdn;
2368         op->o_ndn = be->be_rootndn;
2369
2370         ctxcsnbuf[0] = '\0';
2371
2372         op->o_bd->bd_info = on->on_info->oi_orig;
2373         rc = be_entry_get_rw( op, be->be_nsuffix, NULL,
2374                 slap_schema.si_ad_contextCSN, 0, &e );
2375
2376         if ( e ) {
2377                 ldap_pvt_thread_t tid;
2378
2379                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
2380                 if ( a ) {
2381                         si->si_ctxcsn.bv_len = a->a_nvals[0].bv_len;
2382                         if ( si->si_ctxcsn.bv_len >= sizeof(si->si_ctxcsnbuf ))
2383                                 si->si_ctxcsn.bv_len = sizeof(si->si_ctxcsnbuf)-1;
2384                         strncpy( si->si_ctxcsnbuf, a->a_nvals[0].bv_val,
2385                                 si->si_ctxcsn.bv_len );
2386                         si->si_ctxcsnbuf[si->si_ctxcsn.bv_len] = '\0';
2387                         strcpy( ctxcsnbuf, si->si_ctxcsnbuf );
2388                 }
2389                 be_entry_release_rw( op, e, 0 );
2390                 if ( !BER_BVISEMPTY( &si->si_ctxcsn ) ) {
2391                         op->o_bd->bd_info = (BackendInfo *)on;
2392                         op->o_req_dn = be->be_suffix[0];
2393                         op->o_req_ndn = be->be_nsuffix[0];
2394                         op->ors_scope = LDAP_SCOPE_SUBTREE;
2395                         ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
2396                         ldap_pvt_thread_join( tid, NULL );
2397                 }
2398         }
2399
2400         if ( BER_BVISEMPTY( &si->si_ctxcsn ) ) {
2401                 if ( SLAP_SYNC_SHADOW( op->o_bd )) {
2402                 /* If we're also a consumer, and we didn't get a contextCSN,
2403                  * then don't generate anything, wait for our provider to send it
2404                  * to us.
2405                  */
2406                         goto out;
2407                 }
2408                 si->si_ctxcsn.bv_len = sizeof( si->si_ctxcsnbuf );
2409                 slap_get_csn( op, &si->si_ctxcsn, 0 );
2410         }
2411
2412         /* If our ctxcsn is different from what was read from the root
2413          * entry, make sure we do a checkpoint on close
2414          */
2415         if ( strcmp( si->si_ctxcsnbuf, ctxcsnbuf )) {
2416                 si->si_numops++;
2417         }
2418
2419 out:
2420         op->o_bd->bd_info = (BackendInfo *)on;
2421         ldap_pvt_thread_pool_context_reset( thrctx );
2422         return 0;
2423 }
2424
2425 /* Write the current contextCSN into the underlying db.
2426  */
2427 static int
2428 syncprov_db_close(
2429     BackendDB *be
2430 )
2431 {
2432     slap_overinst   *on = (slap_overinst *) be->bd_info;
2433     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2434
2435         if ( slapMode & SLAP_TOOL_MODE ) {
2436                 return 0;
2437         }
2438         if ( si->si_numops ) {
2439                 Connection conn;
2440                 OperationBuffer opbuf;
2441                 Operation *op = (Operation *) &opbuf;
2442                 SlapReply rs = {REP_RESULT};
2443                 void *thrctx;
2444
2445                 thrctx = ldap_pvt_thread_pool_context();
2446                 connection_fake_init( &conn, op, thrctx );
2447                 op->o_bd = be;
2448                 op->o_dn = be->be_rootdn;
2449                 op->o_ndn = be->be_rootndn;
2450                 syncprov_checkpoint( op, &rs, on );
2451                 ldap_pvt_thread_pool_context_reset( thrctx );
2452         }
2453
2454     return 0;
2455 }
2456
2457 static int
2458 syncprov_db_init(
2459         BackendDB *be
2460 )
2461 {
2462         slap_overinst   *on = (slap_overinst *)be->bd_info;
2463         syncprov_info_t *si;
2464
2465         si = ch_calloc(1, sizeof(syncprov_info_t));
2466         on->on_bi.bi_private = si;
2467         ldap_pvt_thread_mutex_init( &si->si_csn_mutex );
2468         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
2469         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
2470         si->si_ctxcsn.bv_val = si->si_ctxcsnbuf;
2471
2472         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
2473         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
2474         csn_anlist[1].an_desc = slap_schema.si_ad_entryUUID;
2475         csn_anlist[1].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2476
2477         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
2478         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2479
2480         return 0;
2481 }
2482
2483 static int
2484 syncprov_db_destroy(
2485         BackendDB *be
2486 )
2487 {
2488         slap_overinst   *on = (slap_overinst *)be->bd_info;
2489         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2490
2491         if ( si ) {
2492                 if ( si->si_logs ) {
2493                         slog_entry *se = si->si_logs->sl_head;
2494
2495                         while ( se ) {
2496                                 slog_entry *se_next = se->se_next;
2497                                 ch_free( se );
2498                                 se = se_next;
2499                         }
2500
2501                         ch_free( si->si_logs );
2502                 }
2503                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
2504                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
2505                 ldap_pvt_thread_mutex_destroy( &si->si_csn_mutex );
2506                 ch_free( si );
2507         }
2508
2509         return 0;
2510 }
2511
2512 static int syncprov_parseCtrl (
2513         Operation *op,
2514         SlapReply *rs,
2515         LDAPControl *ctrl )
2516 {
2517         ber_tag_t tag;
2518         BerElementBuffer berbuf;
2519         BerElement *ber = (BerElement *)&berbuf;
2520         ber_int_t mode;
2521         ber_len_t len;
2522         struct berval cookie = BER_BVNULL;
2523         sync_control *sr;
2524         int rhint = 0;
2525
2526         if ( op->o_sync != SLAP_CONTROL_NONE ) {
2527                 rs->sr_text = "Sync control specified multiple times";
2528                 return LDAP_PROTOCOL_ERROR;
2529         }
2530
2531         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
2532                 rs->sr_text = "Sync control specified with pagedResults control";
2533                 return LDAP_PROTOCOL_ERROR;
2534         }
2535
2536         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
2537                 rs->sr_text = "Sync control value is empty (or absent)";
2538                 return LDAP_PROTOCOL_ERROR;
2539         }
2540
2541         /* Parse the control value
2542          *      syncRequestValue ::= SEQUENCE {
2543          *              mode   ENUMERATED {
2544          *                      -- 0 unused
2545          *                      refreshOnly             (1),
2546          *                      -- 2 reserved
2547          *                      refreshAndPersist       (3)
2548          *              },
2549          *              cookie  syncCookie OPTIONAL
2550          *      }
2551          */
2552
2553         ber_init2( ber, &ctrl->ldctl_value, 0 );
2554
2555         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
2556                 rs->sr_text = "Sync control : mode decoding error";
2557                 return LDAP_PROTOCOL_ERROR;
2558         }
2559
2560         switch( mode ) {
2561         case LDAP_SYNC_REFRESH_ONLY:
2562                 mode = SLAP_SYNC_REFRESH;
2563                 break;
2564         case LDAP_SYNC_REFRESH_AND_PERSIST:
2565                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
2566                 break;
2567         default:
2568                 rs->sr_text = "Sync control : unknown update mode";
2569                 return LDAP_PROTOCOL_ERROR;
2570         }
2571
2572         tag = ber_peek_tag( ber, &len );
2573
2574         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
2575                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
2576                         rs->sr_text = "Sync control : cookie decoding error";
2577                         return LDAP_PROTOCOL_ERROR;
2578                 }
2579                 tag = ber_peek_tag( ber, &len );
2580         }
2581         if ( tag == LDAP_TAG_RELOAD_HINT ) {
2582                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
2583                         rs->sr_text = "Sync control : rhint decoding error";
2584                         return LDAP_PROTOCOL_ERROR;
2585                 }
2586         }
2587         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
2588                         rs->sr_text = "Sync control : decoding error";
2589                         return LDAP_PROTOCOL_ERROR;
2590         }
2591         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
2592         sr->sr_rhint = rhint;
2593         if (!BER_BVISNULL(&cookie)) {
2594                 ber_dupbv_x( &sr->sr_state.octet_str, &cookie, op->o_tmpmemctx );
2595                 slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx );
2596                 if ( sr->sr_state.rid == -1 ) {
2597                         rs->sr_text = "Sync control : cookie parsing error";
2598                         return LDAP_PROTOCOL_ERROR;
2599                 }
2600         }
2601
2602         op->o_controls[slap_cids.sc_LDAPsync] = sr;
2603
2604         op->o_sync = ctrl->ldctl_iscritical
2605                 ? SLAP_CONTROL_CRITICAL
2606                 : SLAP_CONTROL_NONCRITICAL;
2607
2608         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
2609
2610         return LDAP_SUCCESS;
2611 }
2612
2613 /* This overlay is set up for dynamic loading via moduleload. For static
2614  * configuration, you'll need to arrange for the slap_overinst to be
2615  * initialized and registered by some other function inside slapd.
2616  */
2617
2618 static slap_overinst            syncprov;
2619
2620 int
2621 syncprov_initialize()
2622 {
2623         int rc;
2624
2625         rc = register_supported_control( LDAP_CONTROL_SYNC,
2626                 SLAP_CTRL_SEARCH, NULL,
2627                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
2628         if ( rc != LDAP_SUCCESS ) {
2629                 Debug( LDAP_DEBUG_ANY,
2630                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
2631                 return rc;
2632         }
2633
2634         syncprov.on_bi.bi_type = "syncprov";
2635         syncprov.on_bi.bi_db_init = syncprov_db_init;
2636         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
2637         syncprov.on_bi.bi_db_open = syncprov_db_open;
2638         syncprov.on_bi.bi_db_close = syncprov_db_close;
2639
2640         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
2641         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
2642
2643         syncprov.on_bi.bi_op_add = syncprov_op_mod;
2644         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
2645         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
2646         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
2647         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
2648         syncprov.on_bi.bi_op_search = syncprov_op_search;
2649         syncprov.on_bi.bi_extended = syncprov_op_extended;
2650         syncprov.on_bi.bi_operational = syncprov_operational;
2651
2652         syncprov.on_bi.bi_cf_ocs = spocs;
2653
2654         generic_filter.f_desc = slap_schema.si_ad_objectClass;
2655
2656         rc = config_register_schema( spcfg, spocs );
2657         if ( rc ) return rc;
2658
2659         return overlay_register( &syncprov );
2660 }
2661
2662 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
2663 int
2664 init_module( int argc, char *argv[] )
2665 {
2666         return syncprov_initialize();
2667 }
2668 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
2669
2670 #endif /* defined(SLAPD_OVER_SYNCPROV) */