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 /* Queue a persistent search response */
 915 static int
 916 syncprov_qresp( opcookie *opc, syncops *so, int mode )
 917 {
 918         syncres *sr;
 919
 920         sr = ch_malloc(sizeof(syncres) + opc->suuid.bv_len + 1 +
 921                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1 + opc->sctxcsn.bv_len + 1 );
 922         sr->s_next = NULL;
 923         sr->s_dn.bv_val = (char *)(sr + 1);
 924         sr->s_dn.bv_len = opc->sdn.bv_len;
 925         sr->s_mode = mode;
 926         sr->s_isreference = opc->sreference;
 927         sr->s_ndn.bv_val = lutil_strcopy( sr->s_dn.bv_val,
 928                  opc->sdn.bv_val ) + 1;
 929         sr->s_ndn.bv_len = opc->sndn.bv_len;
 930         sr->s_uuid.bv_val = lutil_strcopy( sr->s_ndn.bv_val,
 931                  opc->sndn.bv_val ) + 1;
 932         sr->s_uuid.bv_len = opc->suuid.bv_len;
 933         AC_MEMCPY( sr->s_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
 934         sr->s_csn.bv_val = sr->s_uuid.bv_val + sr->s_uuid.bv_len + 1;
 935         sr->s_csn.bv_len = opc->sctxcsn.bv_len;
 936         strcpy( sr->s_csn.bv_val, opc->sctxcsn.bv_val );
 937
 938         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 939         if ( !so->s_res ) {
 940                 so->s_res = sr;
 941         } else {
 942                 so->s_restail->s_next = sr;
 943         }
 944         so->s_restail = sr;
 945
 946         /* If the base of the psearch was modified, check it next time round */
 947         if ( so->s_flags & PS_WROTE_BASE ) {
 948                 so->s_flags ^= PS_WROTE_BASE;
 949                 so->s_flags |= PS_FIND_BASE;
 950         }
 951         if ( so->s_flags & PS_IS_DETACHED ) {
 952                 int wake=0;
 953                 ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
 954                 if ( !so->s_qtask ) {
 955                         so->s_qtask = ldap_pvt_runqueue_insert( &slapd_rq, RUNQ_INTERVAL,
 956                                 syncprov_qtask, so, "syncprov_qtask",
 957                                 so->s_op->o_conn->c_peer_name.bv_val );
 958                         ++so->s_inuse;
 959                         wake = 1;
 960                 } else {
 961                         if (!ldap_pvt_runqueue_isrunning( &slapd_rq, so->s_qtask ) &&
 962                                 !so->s_qtask->next_sched.tv_sec ) {
 963                                 so->s_qtask->interval.tv_sec = 0;
 964                                 ldap_pvt_runqueue_resched( &slapd_rq, so->s_qtask, 0 );
 965                                 so->s_qtask->interval.tv_sec = RUNQ_INTERVAL;
 966                                 ++so->s_inuse;
 967                                 wake = 1;
 968                         }
 969                 }
 970                 ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
 971                 if ( wake )
 972                         slap_wake_listener();
 973         }
 974         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 975         return LDAP_SUCCESS;
 976 }
 977
 978 static int
 979 syncprov_drop_psearch( syncops *so, int lock )
 980 {
 981         if ( so->s_flags & PS_IS_DETACHED ) {
 982                 if ( lock )
 983                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
 984                 so->s_op->o_conn->c_n_ops_executing--;
 985                 so->s_op->o_conn->c_n_ops_completed++;
 986                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, slap_op,
 987                         o_next );
 988                 if ( lock )
 989                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
 990         }
 991         syncprov_free_syncop( so );
 992
 993         return 0;
 994 }
 995
 996 static int
 997 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
 998 {
 999         slap_callback *sc = op->o_callback;
1000         op->o_callback = sc->sc_next;
1001         syncprov_drop_psearch( op->o_callback->sc_private, 0 );
1002         op->o_tmpfree( sc, op->o_tmpmemctx );
1003         return 0;
1004 }
1005
1006 static int
1007 syncprov_op_abandon( Operation *op, SlapReply *rs )
1008 {
1009         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1010         syncprov_info_t         *si = on->on_bi.bi_private;
1011         syncops *so, *soprev;
1012
1013         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1014         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
1015                 soprev=so, so=so->s_next ) {
1016                 if ( so->s_op->o_connid == op->o_connid &&
1017                         so->s_op->o_msgid == op->orn_msgid ) {
1018                                 so->s_op->o_abandon = 1;
1019                                 soprev->s_next = so->s_next;
1020                                 break;
1021                 }
1022         }
1023         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1024         if ( so ) {
1025                 /* Is this really a Cancel exop? */
1026                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
1027                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
1028                         rs->sr_err = LDAP_CANCELLED;
1029                         send_ldap_result( so->s_op, rs );
1030                         if ( so->s_flags & PS_IS_DETACHED ) {
1031                                 slap_callback *cb;
1032                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
1033                                 cb->sc_cleanup = syncprov_ab_cleanup;
1034                                 cb->sc_next = op->o_callback;
1035                                 cb->sc_private = so;
1036                                 return SLAP_CB_CONTINUE;
1037                         }
1038                 }
1039                 syncprov_drop_psearch( so, 0 );
1040         }
1041         return SLAP_CB_CONTINUE;
1042 }
1043
1044 /* Find which persistent searches are affected by this operation */
1045 static void
1046 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
1047 {
1048         slap_overinst *on = opc->son;
1049         syncprov_info_t         *si = on->on_bi.bi_private;
1050
1051         fbase_cookie fc;
1052         syncops *ss, *sprev, *snext;
1053         Entry *e;
1054         Attribute *a;
1055         int rc;
1056         struct berval newdn;
1057         int freefdn = 0;
1058
1059         fc.fdn = &op->o_req_ndn;
1060         /* compute new DN */
1061         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1062                 struct berval pdn;
1063                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
1064                 else dnParent( fc.fdn, &pdn );
1065                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
1066                 fc.fdn = &newdn;
1067                 freefdn = 1;
1068         }
1069         if ( op->o_tag != LDAP_REQ_ADD ) {
1070                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
1071                 rc = be_entry_get_rw( op, fc.fdn, NULL, NULL, 0, &e );
1072                 /* If we're sending responses now, make a copy and unlock the DB */
1073                 if ( e && !saveit ) {
1074                         Entry *e2 = entry_dup( e );
1075                         be_entry_release_rw( op, e, 0 );
1076                         e = e2;
1077                 }
1078                 op->o_bd->bd_info = (BackendInfo *)on;
1079                 if ( rc ) return;
1080         } else {
1081                 e = op->ora_e;
1082         }
1083
1084         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1085                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1086                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1087                 opc->sreference = is_entry_referral( e );
1088                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1089                 if ( a )
1090                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1091         } else if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1092                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1093                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1094                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1095                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1096         }
1097
1098         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1099         for (ss = si->si_ops, sprev = (syncops *)&si->si_ops; ss;
1100                 sprev = ss, ss=snext)
1101         {
1102                 syncmatches *sm;
1103                 int found = 0;
1104
1105                 snext = ss->s_next;
1106                 /* validate base */
1107                 fc.fss = ss;
1108                 fc.fbase = 0;
1109                 fc.fscope = 0;
1110
1111                 /* If the base of the search is missing, signal a refresh */
1112                 rc = syncprov_findbase( op, &fc );
1113                 if ( rc != LDAP_SUCCESS ) {
1114                         SlapReply rs = {REP_RESULT};
1115                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1116                                 "search base has changed" );
1117                         sprev->s_next = snext;
1118                         syncprov_drop_psearch( ss, 1 );
1119                         ss = sprev;
1120                         continue;
1121                 }
1122
1123
1124                 /* If we're sending results now, look for this op in old matches */
1125                 if ( !saveit ) {
1126                         syncmatches *old;
1127
1128                         /* Did we modify the search base? */
1129                         if ( dn_match( &op->o_req_ndn, &ss->s_base )) {
1130                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1131                                 ss->s_flags |= PS_WROTE_BASE;
1132                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1133                         }
1134
1135                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1136                                 old=sm, sm=sm->sm_next ) {
1137                                 if ( sm->sm_op == ss ) {
1138                                         found = 1;
1139                                         old->sm_next = sm->sm_next;
1140                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1141                                         break;
1142                                 }
1143                         }
1144                 }
1145
1146                 /* check if current o_req_dn is in scope and matches filter */
1147                 if ( fc.fscope && test_filter( op, e, ss->s_op->ors_filter ) ==
1148                         LDAP_COMPARE_TRUE ) {
1149                         if ( saveit ) {
1150                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1151                                 sm->sm_next = opc->smatches;
1152                                 sm->sm_op = ss;
1153                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1154                                 ++ss->s_inuse;
1155                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1156                                 opc->smatches = sm;
1157                         } else {
1158                                 /* if found send UPDATE else send ADD */
1159                                 syncprov_qresp( opc, ss,
1160                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD );
1161                         }
1162                 } else if ( !saveit && found ) {
1163                         /* send DELETE */
1164                         syncprov_qresp( opc, ss, LDAP_SYNC_DELETE );
1165                 }
1166         }
1167         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1168
1169         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1170                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
1171                 be_entry_release_rw( op, e, 0 );
1172                 op->o_bd->bd_info = (BackendInfo *)on;
1173         }
1174         if ( freefdn ) {
1175                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1176         }
1177 }
1178
1179 static int
1180 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1181 {
1182         slap_callback *cb = op->o_callback;
1183         opcookie *opc = cb->sc_private;
1184         slap_overinst *on = opc->son;
1185         syncprov_info_t         *si = on->on_bi.bi_private;
1186         syncmatches *sm, *snext;
1187         modtarget *mt, mtdummy;
1188
1189         for (sm = opc->smatches; sm; sm=snext) {
1190                 snext = sm->sm_next;
1191                 syncprov_free_syncop( sm->sm_op );
1192                 op->o_tmpfree( sm, op->o_tmpmemctx );
1193         }
1194
1195         /* Remove op from lock table */
1196         mtdummy.mt_op = op;
1197         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1198         mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1199         if ( mt ) {
1200                 modinst *mi = mt->mt_mods;
1201
1202                 /* If there are more, promote the next one */
1203                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1204                 if ( mi->mi_next ) {
1205                         mt->mt_mods = mi->mi_next;
1206                         mt->mt_op = mt->mt_mods->mi_op;
1207                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1208                 } else {
1209                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1210                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1211                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1212                         ch_free( mt );
1213                 }
1214         }
1215         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1216         if ( !BER_BVISNULL( &opc->suuid ))
1217                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1218         if ( !BER_BVISNULL( &opc->sndn ))
1219                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1220         if ( !BER_BVISNULL( &opc->sdn ))
1221                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1222         op->o_callback = cb->sc_next;
1223         op->o_tmpfree(cb, op->o_tmpmemctx);
1224
1225         return 0;
1226 }
1227
1228 static void
1229 syncprov_checkpoint( Operation *op, SlapReply *rs, slap_overinst *on )
1230 {
1231         syncprov_info_t         *si = on->on_bi.bi_private;
1232         Modifications mod;
1233         Operation opm;
1234         SlapReply rsm = { 0 };
1235         struct berval bv[2];
1236         slap_callback cb = {0};
1237
1238         mod.sml_values = bv;
1239         bv[1].bv_val = NULL;
1240         bv[0] = si->si_ctxcsn;
1241         mod.sml_nvalues = NULL;
1242         mod.sml_desc = slap_schema.si_ad_contextCSN;
1243         mod.sml_op = LDAP_MOD_REPLACE;
1244         mod.sml_flags = 0;
1245         mod.sml_next = NULL;
1246
1247         cb.sc_response = slap_null_cb;
1248         opm = *op;
1249         opm.o_tag = LDAP_REQ_MODIFY;
1250         opm.o_callback = &cb;
1251         opm.orm_modlist = &mod;
1252         opm.o_req_dn = op->o_bd->be_suffix[0];
1253         opm.o_req_ndn = op->o_bd->be_nsuffix[0];
1254         opm.o_bd->bd_info = on->on_info->oi_orig;
1255         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1256         SLAP_DBFLAGS( opm.o_bd ) |= SLAP_DBFLAG_NOLASTMOD;
1257         opm.o_bd->be_modify( &opm, &rsm );
1258         SLAP_DBFLAGS( opm.o_bd ) ^= SLAP_DBFLAG_NOLASTMOD;
1259         if ( mod.sml_next != NULL ) {
1260                 slap_mods_free( mod.sml_next, 1 );
1261         }
1262 }
1263
1264 static void
1265 syncprov_add_slog( Operation *op, struct berval *csn )
1266 {
1267         opcookie *opc = op->o_callback->sc_private;
1268         slap_overinst *on = opc->son;
1269         syncprov_info_t         *si = on->on_bi.bi_private;
1270         sessionlog *sl;
1271         slog_entry *se;
1272
1273         sl = si->si_logs;
1274         {
1275                 /* Allocate a record. UUIDs are not NUL-terminated. */
1276                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1277                         csn->bv_len + 1 );
1278                 se->se_next = NULL;
1279                 se->se_tag = op->o_tag;
1280
1281                 se->se_uuid.bv_val = (char *)(&se[1]);
1282                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1283                 se->se_uuid.bv_len = opc->suuid.bv_len;
1284
1285                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1286                 AC_MEMCPY( se->se_csn.bv_val, csn->bv_val, csn->bv_len );
1287                 se->se_csn.bv_val[csn->bv_len] = '\0';
1288                 se->se_csn.bv_len = csn->bv_len;
1289
1290                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1291                 if ( sl->sl_head ) {
1292                         sl->sl_tail->se_next = se;
1293                 } else {
1294                         sl->sl_head = se;
1295                 }
1296                 sl->sl_tail = se;
1297                 sl->sl_num++;
1298                 while ( sl->sl_num > sl->sl_size ) {
1299                         se = sl->sl_head;
1300                         sl->sl_head = se->se_next;
1301                         strcpy( sl->sl_mincsn.bv_val, se->se_csn.bv_val );
1302                         sl->sl_mincsn.bv_len = se->se_csn.bv_len;
1303                         ch_free( se );
1304                         sl->sl_num--;
1305                 }
1306                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1307         }
1308 }
1309
1310 /* Just set a flag if we found the matching entry */
1311 static int
1312 playlog_cb( Operation *op, SlapReply *rs )
1313 {
1314         if ( rs->sr_type == REP_SEARCH ) {
1315                 op->o_callback->sc_private = (void *)1;
1316         }
1317         return rs->sr_err;
1318 }
1319
1320 /* enter with sl->sl_mutex locked, release before returning */
1321 static void
1322 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1323         struct berval *oldcsn, struct berval *ctxcsn )
1324 {
1325         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1326         slog_entry *se;
1327         int i, j, ndel, num, nmods, mmods;
1328         BerVarray uuids;
1329
1330         if ( !sl->sl_num ) {
1331                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1332                 return;
1333         }
1334
1335         num = sl->sl_num;
1336         i = 0;
1337         nmods = 0;
1338
1339         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1340                 num * UUID_LEN, op->o_tmpmemctx );
1341
1342         uuids[0].bv_val = (char *)(uuids + num + 1);
1343
1344         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1345          * and everything else at the end. Do this first so we can
1346          * unlock the list mutex.
1347          */
1348         for ( se=sl->sl_head; se; se=se->se_next ) {
1349                 if ( ber_bvcmp( &se->se_csn, oldcsn ) < 0 ) continue;
1350                 if ( ber_bvcmp( &se->se_csn, ctxcsn ) > 0 ) break;
1351                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1352                         j = i;
1353                         i++;
1354                 } else {
1355                         nmods++;
1356                         j = num - nmods;
1357                 }
1358                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1359                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1360                 uuids[j].bv_len = UUID_LEN;
1361         }
1362         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1363
1364         ndel = i;
1365
1366         /* Zero out unused slots */
1367         for ( i=ndel; i < num - nmods; i++ )
1368                 uuids[i].bv_len = 0;
1369
1370         /* Mods must be validated to see if they belong in this delete set.
1371          */
1372
1373         mmods = nmods;
1374         /* Strip any duplicates */
1375         for ( i=0; i<nmods; i++ ) {
1376                 for ( j=0; j<ndel; j++ ) {
1377                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1378                                 uuids[num - 1 - i].bv_len = 0;
1379                                 mmods --;
1380                                 break;
1381                         }
1382                 }
1383                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1384                 for ( j=0; j<i; j++ ) {
1385                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1386                                 uuids[num - 1 - i].bv_len = 0;
1387                                 mmods --;
1388                                 break;
1389                         }
1390                 }
1391         }
1392
1393         if ( mmods ) {
1394                 Operation fop;
1395                 SlapReply frs = { REP_RESULT };
1396                 int rc;
1397                 Filter mf, af;
1398 #ifdef LDAP_COMP_MATCH
1399                 AttributeAssertion eq = { NULL, BER_BVNULL, NULL };
1400 #else
1401                 AttributeAssertion eq;
1402 #endif
1403                 slap_callback cb = {0};
1404
1405                 fop = *op;
1406
1407                 fop.o_sync_mode = 0;
1408                 fop.o_callback = &cb;
1409                 fop.ors_limit = NULL;
1410                 fop.ors_tlimit = SLAP_NO_LIMIT;
1411                 fop.ors_attrs = slap_anlist_all_attributes;
1412                 fop.ors_attrsonly = 0;
1413                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1414
1415                 af.f_choice = LDAP_FILTER_AND;
1416                 af.f_next = NULL;
1417                 af.f_and = &mf;
1418                 mf.f_choice = LDAP_FILTER_EQUALITY;
1419                 mf.f_ava = &eq;
1420                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1421                 mf.f_next = fop.ors_filter;
1422
1423                 fop.ors_filter = &af;
1424
1425                 cb.sc_response = playlog_cb;
1426                 fop.o_bd->bd_info = on->on_info->oi_orig;
1427
1428                 for ( i=ndel; i<num; i++ ) {
1429                         if ( uuids[i].bv_len == 0 ) continue;
1430
1431                         mf.f_av_value = uuids[i];
1432                         cb.sc_private = NULL;
1433                         fop.ors_slimit = 1;
1434                         frs.sr_nentries = 0;
1435                         rc = fop.o_bd->be_search( &fop, &frs );
1436
1437                         /* If entry was not found, add to delete list */
1438                         if ( !cb.sc_private ) {
1439                                 uuids[ndel++] = uuids[i];
1440                         }
1441                 }
1442                 fop.o_bd->bd_info = (BackendInfo *)on;
1443         }
1444         if ( ndel ) {
1445                 uuids[ndel].bv_val = NULL;
1446                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL, 0, uuids, 1 );
1447         }
1448 }
1449
1450 static int
1451 syncprov_op_response( Operation *op, SlapReply *rs )
1452 {
1453         opcookie *opc = op->o_callback->sc_private;
1454         slap_overinst *on = opc->son;
1455         syncprov_info_t         *si = on->on_bi.bi_private;
1456         syncmatches *sm;
1457
1458         if ( rs->sr_err == LDAP_SUCCESS )
1459         {
1460                 struct berval maxcsn = BER_BVNULL, curcsn = BER_BVNULL;
1461                 char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1462
1463                 /* Update our context CSN */
1464                 cbuf[0] = '\0';
1465                 ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1466                 slap_get_commit_csn( op, &maxcsn, &curcsn );
1467                 if ( !BER_BVISNULL( &maxcsn ) ) {
1468                         strcpy( cbuf, maxcsn.bv_val );
1469                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn ) > 0 ) {
1470                                 strcpy( si->si_ctxcsnbuf, cbuf );
1471                                 si->si_ctxcsn.bv_len = maxcsn.bv_len;
1472                         }
1473                 }
1474
1475                 /* Don't do any processing for consumer contextCSN updates */
1476                 if ( SLAP_SYNC_SHADOW( op->o_bd ) &&
1477                         op->o_msgid == SLAP_SYNC_UPDATE_MSGID ) {
1478                         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1479                         return SLAP_CB_CONTINUE;
1480                 }
1481
1482                 si->si_numops++;
1483                 if ( si->si_chkops || si->si_chktime ) {
1484                         int do_check=0;
1485                         if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1486                                 do_check = 1;
1487                                 si->si_numops = 0;
1488                         }
1489                         if ( si->si_chktime &&
1490                                 (op->o_time - si->si_chklast >= si->si_chktime )) {
1491                                 do_check = 1;
1492                                 si->si_chklast = op->o_time;
1493                         }
1494                         if ( do_check ) {
1495                                 syncprov_checkpoint( op, rs, on );
1496                         }
1497                 }
1498                 ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1499
1500                 opc->sctxcsn.bv_len = maxcsn.bv_len;
1501                 opc->sctxcsn.bv_val = cbuf;
1502
1503                 /* Handle any persistent searches */
1504                 if ( si->si_ops ) {
1505                         switch(op->o_tag) {
1506                         case LDAP_REQ_ADD:
1507                         case LDAP_REQ_MODIFY:
1508                         case LDAP_REQ_MODRDN:
1509                         case LDAP_REQ_EXTENDED:
1510                                 syncprov_matchops( op, opc, 0 );
1511                                 break;
1512                         case LDAP_REQ_DELETE:
1513                                 /* for each match in opc->smatches:
1514                                  *   send DELETE msg
1515                                  */
1516                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1517                                         if ( sm->sm_op->s_op->o_abandon )
1518                                                 continue;
1519                                         syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_DELETE );
1520                                 }
1521                                 break;
1522                         }
1523                 }
1524
1525                 /* Add any log records */
1526                 if ( si->si_logs && op->o_tag != LDAP_REQ_ADD ) {
1527                         syncprov_add_slog( op, &curcsn );
1528                 }
1529
1530         }
1531         return SLAP_CB_CONTINUE;
1532 }
1533
1534 /* We don't use a subentry to store the context CSN any more.
1535  * We expose the current context CSN as an operational attribute
1536  * of the suffix entry.
1537  */
1538 static int
1539 syncprov_op_compare( Operation *op, SlapReply *rs )
1540 {
1541         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1542         syncprov_info_t         *si = on->on_bi.bi_private;
1543         int rc = SLAP_CB_CONTINUE;
1544
1545         if ( dn_match( &op->o_req_ndn, op->o_bd->be_nsuffix ) &&
1546                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1547         {
1548                 Entry e = {0};
1549                 Attribute a = {0};
1550                 struct berval bv[2];
1551
1552                 e.e_name = op->o_bd->be_suffix[0];
1553                 e.e_nname = op->o_bd->be_nsuffix[0];
1554
1555                 BER_BVZERO( &bv[1] );
1556                 bv[0] = si->si_ctxcsn;
1557
1558                 a.a_desc = slap_schema.si_ad_contextCSN;
1559                 a.a_vals = bv;
1560                 a.a_nvals = a.a_vals;
1561
1562                 ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1563
1564                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1565                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1566                 if ( ! rs->sr_err ) {
1567                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1568                         goto return_results;
1569                 }
1570
1571                 if ( get_assert( op ) &&
1572                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
1573                 {
1574                         rs->sr_err = LDAP_ASSERTION_FAILED;
1575                         goto return_results;
1576                 }
1577
1578
1579                 rs->sr_err = LDAP_COMPARE_FALSE;
1580
1581                 if ( value_find_ex( op->oq_compare.rs_ava->aa_desc,
1582                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
1583                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
1584                                 a.a_nvals, &op->oq_compare.rs_ava->aa_value, op->o_tmpmemctx ) == 0 )
1585                 {
1586                         rs->sr_err = LDAP_COMPARE_TRUE;
1587                 }
1588
1589 return_results:;
1590
1591                 ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1592
1593                 send_ldap_result( op, rs );
1594
1595                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
1596                         rs->sr_err = LDAP_SUCCESS;
1597                 }
1598                 rc = rs->sr_err;
1599         }
1600
1601         return rc;
1602 }
1603
1604 static int
1605 syncprov_op_mod( Operation *op, SlapReply *rs )
1606 {
1607         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1608         syncprov_info_t         *si = on->on_bi.bi_private;
1609
1610         slap_callback *cb = op->o_tmpcalloc(1, sizeof(slap_callback)+
1611                 sizeof(opcookie) +
1612                 (si->si_ops ? sizeof(modinst) : 0 ),
1613                 op->o_tmpmemctx);
1614         opcookie *opc = (opcookie *)(cb+1);
1615         opc->son = on;
1616         cb->sc_response = syncprov_op_response;
1617         cb->sc_cleanup = syncprov_op_cleanup;
1618         cb->sc_private = opc;
1619         cb->sc_next = op->o_callback;
1620         op->o_callback = cb;
1621
1622         /* If there are active persistent searches, lock this operation.
1623          * See seqmod.c for the locking logic on its own.
1624          */
1625         if ( si->si_ops ) {
1626                 modtarget *mt, mtdummy;
1627                 modinst *mi;
1628
1629                 mi = (modinst *)(opc+1);
1630                 mi->mi_op = op;
1631
1632                 /* See if we're already modifying this entry... */
1633                 mtdummy.mt_op = op;
1634                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1635                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1636                 if ( mt ) {
1637                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1638                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1639                         mt->mt_tail->mi_next = mi;
1640                         mt->mt_tail = mi;
1641                         /* wait for this op to get to head of list */
1642                         while ( mt->mt_mods != mi ) {
1643                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1644                                 ldap_pvt_thread_yield();
1645                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1646
1647                                 /* clean up if the caller is giving up */
1648                                 if ( op->o_abandon ) {
1649                                         modinst *m2;
1650                                         for ( m2 = mt->mt_mods; m2->mi_next != mi;
1651                                                 m2 = m2->mi_next );
1652                                         m2->mi_next = mi->mi_next;
1653                                         if ( mt->mt_tail == mi ) mt->mt_tail = m2;
1654                                         op->o_tmpfree( cb, op->o_tmpmemctx );
1655                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1656                                         return SLAPD_ABANDON;
1657                                 }
1658                         }
1659                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1660                 } else {
1661                         /* Record that we're modifying this entry now */
1662                         mt = ch_malloc( sizeof(modtarget) );
1663                         mt->mt_mods = mi;
1664                         mt->mt_tail = mi;
1665                         mt->mt_op = mi->mi_op;
1666                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
1667                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
1668                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1669                 }
1670         }
1671
1672         if (( si->si_ops || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
1673                 syncprov_matchops( op, opc, 1 );
1674
1675         return SLAP_CB_CONTINUE;
1676 }
1677
1678 static int
1679 syncprov_op_extended( Operation *op, SlapReply *rs )
1680 {
1681         if ( exop_is_write( op ))
1682                 return syncprov_op_mod( op, rs );
1683
1684         return SLAP_CB_CONTINUE;
1685 }
1686
1687 typedef struct searchstate {
1688         slap_overinst *ss_on;
1689         syncops *ss_so;
1690         int ss_present;
1691         struct berval ss_ctxcsn;
1692         char ss_csnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1693 } searchstate;
1694
1695 static int
1696 syncprov_search_cleanup( Operation *op, SlapReply *rs )
1697 {
1698         if ( rs->sr_ctrls ) {
1699                 op->o_tmpfree( rs->sr_ctrls[0], op->o_tmpmemctx );
1700                 op->o_tmpfree( rs->sr_ctrls, op->o_tmpmemctx );
1701                 rs->sr_ctrls = NULL;
1702         }
1703         return 0;
1704 }
1705
1706 static void
1707 syncprov_detach_op( Operation *op, syncops *so, slap_overinst *on )
1708 {
1709         Operation *op2;
1710         int i, alen = 0;
1711         size_t size;
1712         char *ptr;
1713         GroupAssertion *g1, *g2;
1714
1715         /* count the search attrs */
1716         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1717                 alen += op->ors_attrs[i].an_name.bv_len + 1;
1718         }
1719         /* Make a new copy of the operation */
1720         size = sizeof(Operation) + sizeof(Opheader) +
1721                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
1722                 op->o_req_dn.bv_len + 1 +
1723                 op->o_req_ndn.bv_len + 1 +
1724                 op->o_ndn.bv_len + 1 +
1725                 so->s_filterstr.bv_len + 1;
1726         op2 = (Operation *)ch_calloc( 1, size );
1727         op2->o_hdr = (Opheader *)(op2+1);
1728
1729         /* Copy the fields we care about explicitly, leave the rest alone */
1730         *op2->o_hdr = *op->o_hdr;
1731         op2->o_tag = op->o_tag;
1732         op2->o_time = op->o_time;
1733         op2->o_bd = on->on_info->oi_origdb;
1734         op2->o_request = op->o_request;
1735         op2->o_private = on;
1736
1737         if ( i ) {
1738                 op2->ors_attrs = (AttributeName *)(op2->o_hdr + 1);
1739                 ptr = (char *)(op2->ors_attrs+i+1);
1740                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1741                         op2->ors_attrs[i] = op->ors_attrs[i];
1742                         op2->ors_attrs[i].an_name.bv_val = ptr;
1743                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
1744                 }
1745                 BER_BVZERO( &op2->ors_attrs[i].an_name );
1746         } else {
1747                 ptr = (char *)(op2->o_hdr + 1);
1748         }
1749         op2->o_authz = op->o_authz;
1750         op2->o_ndn.bv_val = ptr;
1751         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
1752         op2->o_dn = op2->o_ndn;
1753         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
1754         op2->o_req_dn.bv_val = ptr;
1755         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
1756         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
1757         op2->o_req_ndn.bv_val = ptr;
1758         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
1759         op2->ors_filterstr.bv_val = ptr;
1760         strcpy( ptr, so->s_filterstr.bv_val );
1761         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
1762         op2->ors_filter = filter_dup( op->ors_filter, NULL );
1763         so->s_op = op2;
1764
1765         /* Copy any cached group ACLs individually */
1766         op2->o_groups = NULL;
1767         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
1768                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
1769                 *g2 = *g1;
1770                 strcpy( g2->ga_ndn, g1->ga_ndn );
1771                 g2->ga_next = op2->o_groups;
1772                 op2->o_groups = g2;
1773         }
1774         /* Don't allow any further group caching */
1775         op2->o_do_not_cache = 1;
1776
1777         /* Add op2 to conn so abandon will find us */
1778         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
1779         op->o_conn->c_n_ops_executing++;
1780         op->o_conn->c_n_ops_completed--;
1781         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
1782         so->s_flags |= PS_IS_DETACHED;
1783         ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
1784
1785         /* Prevent anyone else from trying to send a result for this op */
1786         op->o_abandon = 1;
1787 }
1788
1789 static int
1790 syncprov_search_response( Operation *op, SlapReply *rs )
1791 {
1792         searchstate *ss = op->o_callback->sc_private;
1793         slap_overinst *on = ss->ss_on;
1794         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
1795
1796         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
1797                 Attribute *a;
1798                 /* If we got a referral without a referral object, there's
1799                  * something missing that we cannot replicate. Just ignore it.
1800                  * The consumer will abort because we didn't send the expected
1801                  * control.
1802                  */
1803                 if ( !rs->sr_entry ) {
1804                         assert( rs->sr_entry != NULL );
1805                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
1806                         return SLAP_CB_CONTINUE;
1807                 }
1808                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryCSN );
1809                 if ( a == NULL && rs->sr_operational_attrs != NULL ) {
1810                         a = attr_find( rs->sr_operational_attrs, slap_schema.si_ad_entryCSN );
1811                 }
1812                 if ( a ) {
1813                         /* Make sure entry is less than the snapshot'd contextCSN */
1814                         if ( ber_bvcmp( &a->a_nvals[0], &ss->ss_ctxcsn ) > 0 )
1815                                 return LDAP_SUCCESS;
1816
1817                         /* Don't send the ctx entry twice */
1818                         if ( !BER_BVISNULL( &srs->sr_state.ctxcsn ) &&
1819                                 bvmatch( &a->a_nvals[0], &srs->sr_state.ctxcsn ) )
1820                                 return LDAP_SUCCESS;
1821                 }
1822                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1823                         op->o_tmpmemctx );
1824                 rs->sr_ctrls[1] = NULL;
1825                 rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
1826                         LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
1827         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
1828                 struct berval cookie;
1829
1830                 slap_compose_sync_cookie( op, &cookie, &ss->ss_ctxcsn,
1831                         srs->sr_state.rid );
1832
1833                 /* Is this a regular refresh? */
1834                 if ( !ss->ss_so ) {
1835                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1836                                 op->o_tmpmemctx );
1837                         rs->sr_ctrls[1] = NULL;
1838                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
1839                                 0, 1, &cookie, ss->ss_present ?  LDAP_SYNC_REFRESH_PRESENTS :
1840                                         LDAP_SYNC_REFRESH_DELETES );
1841                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1842                 } else {
1843                 /* It's RefreshAndPersist, transition to Persist phase */
1844                         syncprov_sendinfo( op, rs, ( ss->ss_present && rs->sr_nentries ) ?
1845                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
1846                                 &cookie, 1, NULL, 0 );
1847                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1848
1849                         /* Detach this Op from frontend control */
1850                         ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
1851
1852                         /* Turn off the refreshing flag */
1853                         ss->ss_so->s_flags ^= PS_IS_REFRESHING;
1854
1855                         syncprov_detach_op( op, ss->ss_so, on );
1856                         ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
1857
1858                         return LDAP_SUCCESS;
1859                 }
1860         }
1861
1862         return SLAP_CB_CONTINUE;
1863 }
1864
1865 static int
1866 syncprov_op_search( Operation *op, SlapReply *rs )
1867 {
1868         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1869         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
1870         slap_callback   *cb;
1871         int gotstate = 0, nochange = 0, do_present;
1872         syncops *sop = NULL;
1873         searchstate *ss;
1874         sync_control *srs;
1875         struct berval ctxcsn;
1876         char csnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1877
1878         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
1879
1880         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
1881                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
1882                 return rs->sr_err;
1883         }
1884
1885         do_present = si->si_nopres ? 0 : 1;
1886
1887         srs = op->o_controls[slap_cids.sc_LDAPsync];
1888         op->o_managedsait = SLAP_CONTROL_NONCRITICAL;
1889
1890         /* If this is a persistent search, set it up right away */
1891         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
1892                 syncops so = {0};
1893                 fbase_cookie fc;
1894                 opcookie opc;
1895                 slap_callback sc;
1896
1897                 fc.fss = &so;
1898                 fc.fbase = 0;
1899                 so.s_eid = NOID;
1900                 so.s_op = op;
1901                 so.s_flags = PS_IS_REFRESHING | PS_FIND_BASE;
1902                 /* syncprov_findbase expects to be called as a callback... */
1903                 sc.sc_private = &opc;
1904                 opc.son = on;
1905                 ldap_pvt_thread_mutex_init( &so.s_mutex );
1906                 cb = op->o_callback;
1907                 op->o_callback = &sc;
1908                 rs->sr_err = syncprov_findbase( op, &fc );
1909                 op->o_callback = cb;
1910                 ldap_pvt_thread_mutex_destroy( &so.s_mutex );
1911
1912                 if ( rs->sr_err != LDAP_SUCCESS ) {
1913                         send_ldap_result( op, rs );
1914                         return rs->sr_err;
1915                 }
1916                 sop = ch_malloc( sizeof( syncops ));
1917                 *sop = so;
1918                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
1919                 sop->s_rid = srs->sr_state.rid;
1920                 sop->s_inuse = 1;
1921
1922                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1923                 sop->s_next = si->si_ops;
1924                 si->si_ops = sop;
1925                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1926         }
1927
1928         /* snapshot the ctxcsn */
1929         ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1930         strcpy( csnbuf, si->si_ctxcsnbuf );
1931         ctxcsn.bv_len = si->si_ctxcsn.bv_len;
1932         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1933         ctxcsn.bv_val = csnbuf;
1934
1935         /* If we have a cookie, handle the PRESENT lookups */
1936         if ( !BER_BVISNULL( &srs->sr_state.ctxcsn )) {
1937                 sessionlog *sl;
1938
1939                 /* The cookie was validated when it was parsed, just use it */
1940
1941                 /* If just Refreshing and nothing has changed, shortcut it */
1942                 if ( bvmatch( &srs->sr_state.ctxcsn, &ctxcsn )) {
1943                         nochange = 1;
1944                         if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
1945                                 LDAPControl     *ctrls[2];
1946
1947                                 ctrls[0] = NULL;
1948                                 ctrls[1] = NULL;
1949                                 syncprov_done_ctrl( op, rs, ctrls, 0, 0,
1950                                         NULL, LDAP_SYNC_REFRESH_DELETES );
1951                                 rs->sr_ctrls = ctrls;
1952                                 rs->sr_err = LDAP_SUCCESS;
1953                                 send_ldap_result( op, rs );
1954                                 rs->sr_ctrls = NULL;
1955                                 return rs->sr_err;
1956                         }
1957                         goto shortcut;
1958                 }
1959                 /* Do we have a sessionlog for this search? */
1960                 sl=si->si_logs;
1961                 if ( sl ) {
1962                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1963                         if ( ber_bvcmp( &srs->sr_state.ctxcsn, &sl->sl_mincsn ) >= 0 ) {
1964                                 do_present = 0;
1965                                 /* mutex is unlocked in playlog */
1966                                 syncprov_playlog( op, rs, sl, &srs->sr_state.ctxcsn, &ctxcsn );
1967                         } else {
1968                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1969                         }
1970                 }
1971                 /* Is the CSN still present in the database? */
1972                 if ( syncprov_findcsn( op, FIND_CSN ) != LDAP_SUCCESS ) {
1973                         /* No, so a reload is required */
1974                         /* the 2.2 consumer doesn't send this hint */
1975                         if ( si->si_usehint && srs->sr_rhint == 0 ) {
1976                                 send_ldap_error( op, rs, LDAP_SYNC_REFRESH_REQUIRED, "sync cookie is stale" );
1977                                 return rs->sr_err;
1978                         }
1979                 } else {
1980                         gotstate = 1;
1981                         /* If changed and doing Present lookup, send Present UUIDs */
1982                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT ) !=
1983                                 LDAP_SUCCESS ) {
1984                                 send_ldap_result( op, rs );
1985                                 return rs->sr_err;
1986                         }
1987                 }
1988         }
1989
1990 shortcut:
1991         /* Append CSN range to search filter, save original filter
1992          * for persistent search evaluation
1993          */
1994         if ( sop ) {
1995                 sop->s_filterstr= op->ors_filterstr;
1996         }
1997
1998         /* If something changed, find the changes */
1999         if ( gotstate && !nochange ) {
2000                 Filter *fand, *fava;
2001
2002                 fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2003                 fand->f_choice = LDAP_FILTER_AND;
2004                 fand->f_next = NULL;
2005                 fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2006                 fand->f_and = fava;
2007                 fava->f_choice = LDAP_FILTER_GE;
2008                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
2009                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
2010 #ifdef LDAP_COMP_MATCH
2011                 fava->f_ava->aa_cf = NULL;
2012 #endif
2013                 ber_dupbv_x( &fava->f_ava->aa_value, &srs->sr_state.ctxcsn, op->o_tmpmemctx );
2014                 fava->f_next = op->ors_filter;
2015                 op->ors_filter = fand;
2016                 filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
2017         }
2018
2019         /* Let our callback add needed info to returned entries */
2020         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
2021         ss = (searchstate *)(cb+1);
2022         ss->ss_on = on;
2023         ss->ss_so = sop;
2024         ss->ss_present = do_present;
2025         ss->ss_ctxcsn.bv_len = ctxcsn.bv_len;
2026         ss->ss_ctxcsn.bv_val = ss->ss_csnbuf;
2027         strcpy( ss->ss_ctxcsn.bv_val, ctxcsn.bv_val );
2028         cb->sc_response = syncprov_search_response;
2029         cb->sc_cleanup = syncprov_search_cleanup;
2030         cb->sc_private = ss;
2031         cb->sc_next = op->o_callback;
2032         op->o_callback = cb;
2033
2034 #if 0   /* I don't think we need to shortcircuit back-bdb any more */
2035         op->o_sync_mode &= SLAP_CONTROL_MASK;
2036 #endif
2037
2038         /* If this is a persistent search and no changes were reported during
2039          * the refresh phase, just invoke the response callback to transition
2040          * us into persist phase
2041          */
2042         if ( nochange ) {
2043                 rs->sr_err = LDAP_SUCCESS;
2044                 rs->sr_nentries = 0;
2045                 send_ldap_result( op, rs );
2046                 return rs->sr_err;
2047         }
2048         return SLAP_CB_CONTINUE;
2049 }
2050
2051 static int
2052 syncprov_operational(
2053         Operation *op,
2054         SlapReply *rs )
2055 {
2056         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2057         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2058
2059         if ( rs->sr_entry &&
2060                 dn_match( &rs->sr_entry->e_nname, op->o_bd->be_nsuffix )) {
2061
2062                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
2063                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
2064                         Attribute *a, **ap = NULL;
2065
2066                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
2067                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
2068                                         break;
2069                         }
2070
2071                         if ( !a ) {
2072                                 for ( ap = &rs->sr_operational_attrs; *ap; ap=&(*ap)->a_next );
2073
2074                                 a = ch_malloc( sizeof(Attribute));
2075                                 a->a_desc = slap_schema.si_ad_contextCSN;
2076                                 a->a_vals = ch_malloc( 2 * sizeof(struct berval));
2077                                 a->a_vals[1].bv_val = NULL;
2078                                 a->a_nvals = a->a_vals;
2079                                 a->a_next = NULL;
2080                                 a->a_flags = 0;
2081                                 *ap = a;
2082                         }
2083
2084                         ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
2085                         if ( !ap ) {
2086                                 strcpy( a->a_vals[0].bv_val, si->si_ctxcsnbuf );
2087                         } else {
2088                                 ber_dupbv( &a->a_vals[0], &si->si_ctxcsn );
2089                         }
2090                         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
2091                 }
2092         }
2093         return SLAP_CB_CONTINUE;
2094 }
2095
2096 enum {
2097         SP_CHKPT = 1,
2098         SP_SESSL,
2099         SP_NOPRES,
2100         SP_USEHINT
2101 };
2102
2103 static ConfigDriver sp_cf_gen;
2104
2105 static ConfigTable spcfg[] = {
2106         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2107                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2108                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2109                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2110         { "syncprov-sessionlog", "ops", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2111                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2112                         "DESC 'Session log size in ops' "
2113                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2114         { "syncprov-nopresent", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_NOPRES,
2115                 sp_cf_gen, "( OLcfgOvAt:1.3 NAME 'olcSpNoPresent' "
2116                         "DESC 'Omit Present phase processing' "
2117                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2118         { "syncprov-reloadhint", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_USEHINT,
2119                 sp_cf_gen, "( OLcfgOvAt:1.4 NAME 'olcSpReloadHint' "
2120                         "DESC 'Observe Reload Hint in Request control' "
2121                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2122         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2123 };
2124
2125 static ConfigOCs spocs[] = {
2126         { "( OLcfgOvOc:1.1 "
2127                 "NAME 'olcSyncProvConfig' "
2128                 "DESC 'SyncRepl Provider configuration' "
2129                 "SUP olcOverlayConfig "
2130                 "MAY ( olcSpCheckpoint $ olcSpSessionlog $ olcSpNoPresent ) )",
2131                         Cft_Overlay, spcfg },
2132         { NULL, 0, NULL }
2133 };
2134
2135 static int
2136 sp_cf_gen(ConfigArgs *c)
2137 {
2138         slap_overinst           *on = (slap_overinst *)c->bi;
2139         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2140         int rc = 0;
2141
2142         if ( c->op == SLAP_CONFIG_EMIT ) {
2143                 switch ( c->type ) {
2144                 case SP_CHKPT:
2145                         if ( si->si_chkops || si->si_chktime ) {
2146                                 struct berval bv;
2147                                 bv.bv_len = sprintf( c->msg, "%d %d",
2148                                         si->si_chkops, si->si_chktime );
2149                                 bv.bv_val = c->msg;
2150                                 value_add_one( &c->rvalue_vals, &bv );
2151                         } else {
2152                                 rc = 1;
2153                         }
2154                         break;
2155                 case SP_SESSL:
2156                         if ( si->si_logs ) {
2157                                 c->value_int = si->si_logs->sl_size;
2158                         } else {
2159                                 rc = 1;
2160                         }
2161                         break;
2162                 case SP_NOPRES:
2163                         if ( si->si_nopres ) {
2164                                 c->value_int = 1;
2165                         } else {
2166                                 rc = 1;
2167                         }
2168                         break;
2169                 case SP_USEHINT:
2170                         if ( si->si_usehint ) {
2171                                 c->value_int = 1;
2172                         } else {
2173                                 rc = 1;
2174                         }
2175                         break;
2176                 }
2177                 return rc;
2178         } else if ( c->op == LDAP_MOD_DELETE ) {
2179                 switch ( c->type ) {
2180                 case SP_CHKPT:
2181                         si->si_chkops = 0;
2182                         si->si_chktime = 0;
2183                         break;
2184                 case SP_SESSL:
2185                         if ( si->si_logs )
2186                                 si->si_logs->sl_size = 0;
2187                         else
2188                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2189                         break;
2190                 case SP_NOPRES:
2191                         if ( si->si_nopres )
2192                                 si->si_nopres = 0;
2193                         else
2194                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2195                         break;
2196                 case SP_USEHINT:
2197                         if ( si->si_usehint )
2198                                 si->si_usehint = 0;
2199                         else
2200                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2201                         break;
2202                 }
2203                 return rc;
2204         }
2205         switch ( c->type ) {
2206         case SP_CHKPT:
2207                 if ( lutil_atoi( &si->si_chkops, c->argv[1] ) != 0 ) {
2208                         sprintf( c->msg, "%s unable to parse checkpoint ops # \"%s\"",
2209                                 c->argv[0], c->argv[1] );
2210                         Debug( LDAP_DEBUG_CONFIG, "%s: %s\n", c->log, c->msg, 0 );
2211                         return ARG_BAD_CONF;
2212                 }
2213                 if ( si->si_chkops <= 0 ) {
2214                         sprintf( c->msg, "%s invalid checkpoint ops # \"%d\"",
2215                                 c->argv[0], si->si_chkops );
2216                         Debug( LDAP_DEBUG_CONFIG, "%s: %s\n", c->log, c->msg, 0 );
2217                         return ARG_BAD_CONF;
2218                 }
2219                 if ( lutil_atoi( &si->si_chktime, c->argv[2] ) != 0 ) {
2220                         sprintf( c->msg, "%s unable to parse checkpoint time \"%s\"",
2221                                 c->argv[0], c->argv[1] );
2222                         Debug( LDAP_DEBUG_CONFIG, "%s: %s\n", c->log, c->msg, 0 );
2223                         return ARG_BAD_CONF;
2224                 }
2225                 if ( si->si_chktime <= 0 ) {
2226                         sprintf( c->msg, "%s invalid checkpoint time \"%d\"",
2227                                 c->argv[0], si->si_chkops );
2228                         Debug( LDAP_DEBUG_CONFIG, "%s: %s\n", c->log, c->msg, 0 );
2229                         return ARG_BAD_CONF;
2230                 }
2231                 si->si_chktime *= 60;
2232                 break;
2233         case SP_SESSL: {
2234                 sessionlog *sl;
2235                 int size = c->value_int;
2236
2237                 if ( size < 0 ) {
2238                         sprintf( c->msg, "%s size %d is negative",
2239                                 c->argv[0], size );
2240                         Debug( LDAP_DEBUG_CONFIG, "%s: %s\n", c->log, c->msg, 0 );
2241                         return ARG_BAD_CONF;
2242                 }
2243                 sl = si->si_logs;
2244                 if ( !sl ) {
2245                         sl = ch_malloc( sizeof( sessionlog ) + LDAP_LUTIL_CSNSTR_BUFSIZE );
2246                         sl->sl_mincsn.bv_val = (char *)(sl+1);
2247                         sl->sl_mincsn.bv_len = 0;
2248                         sl->sl_num = 0;
2249                         sl->sl_head = sl->sl_tail = NULL;
2250                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
2251                         si->si_logs = sl;
2252                 }
2253                 sl->sl_size = size;
2254                 }
2255                 break;
2256         case SP_NOPRES:
2257                 si->si_nopres = c->value_int;
2258                 break;
2259         case SP_USEHINT:
2260                 si->si_usehint = c->value_int;
2261                 break;
2262         }
2263         return rc;
2264 }
2265
2266 /* ITS#3456 we cannot run this search on the main thread, must use a
2267  * child thread in order to insure we have a big enough stack.
2268  */
2269 static void *
2270 syncprov_db_otask(
2271         void *ptr
2272 )
2273 {
2274         syncprov_findcsn( ptr, FIND_MAXCSN );
2275         return NULL;
2276 }
2277
2278 /* Read any existing contextCSN from the underlying db.
2279  * Then search for any entries newer than that. If no value exists,
2280  * just generate it. Cache whatever result.
2281  */
2282 static int
2283 syncprov_db_open(
2284     BackendDB *be
2285 )
2286 {
2287         slap_overinst   *on = (slap_overinst *) be->bd_info;
2288         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2289
2290         Connection conn = { 0 };
2291         OperationBuffer opbuf = { 0 };
2292         char ctxcsnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
2293         Operation *op = (Operation *) &opbuf;
2294         Entry *e;
2295         Attribute *a;
2296         int rc;
2297         void *thrctx = NULL;
2298
2299         if ( slapMode & SLAP_TOOL_MODE ) {
2300                 return 0;
2301         }
2302
2303         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
2304         if ( rc ) {
2305                 return rc;
2306         }
2307
2308         thrctx = ldap_pvt_thread_pool_context();
2309         connection_fake_init( &conn, op, thrctx );
2310         op->o_bd = be;
2311         op->o_dn = be->be_rootdn;
2312         op->o_ndn = be->be_rootndn;
2313
2314         ctxcsnbuf[0] = '\0';
2315
2316         op->o_bd->bd_info = on->on_info->oi_orig;
2317         rc = be_entry_get_rw( op, be->be_nsuffix, NULL,
2318                 slap_schema.si_ad_contextCSN, 0, &e );
2319
2320         if ( e ) {
2321                 ldap_pvt_thread_t tid;
2322
2323                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
2324                 if ( a ) {
2325                         si->si_ctxcsn.bv_len = a->a_nvals[0].bv_len;
2326                         if ( si->si_ctxcsn.bv_len >= sizeof(si->si_ctxcsnbuf ))
2327                                 si->si_ctxcsn.bv_len = sizeof(si->si_ctxcsnbuf)-1;
2328                         strncpy( si->si_ctxcsnbuf, a->a_nvals[0].bv_val,
2329                                 si->si_ctxcsn.bv_len );
2330                         si->si_ctxcsnbuf[si->si_ctxcsn.bv_len] = '\0';
2331                         strcpy( ctxcsnbuf, si->si_ctxcsnbuf );
2332                 }
2333                 be_entry_release_rw( op, e, 0 );
2334                 if ( !BER_BVISEMPTY( &si->si_ctxcsn ) ) {
2335                         op->o_bd->bd_info = (BackendInfo *)on;
2336                         op->o_req_dn = be->be_suffix[0];
2337                         op->o_req_ndn = be->be_nsuffix[0];
2338                         op->ors_scope = LDAP_SCOPE_SUBTREE;
2339                         ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
2340                         ldap_pvt_thread_join( tid, NULL );
2341                 }
2342         } else if ( SLAP_SYNC_SHADOW( op->o_bd )) {
2343                 /* If we're also a consumer, and we didn't find the context entry,
2344                  * then don't generate anything, wait for our provider to send it
2345                  * to us.
2346                  */
2347                 goto out;
2348         }
2349
2350         if ( BER_BVISEMPTY( &si->si_ctxcsn ) ) {
2351                 si->si_ctxcsn.bv_len = sizeof( si->si_ctxcsnbuf );
2352                 slap_get_csn( op, &si->si_ctxcsn, 0 );
2353         }
2354
2355         /* If our ctxcsn is different from what was read from the root
2356          * entry, make sure we do a checkpoint on close
2357          */
2358         if ( strcmp( si->si_ctxcsnbuf, ctxcsnbuf )) {
2359                 si->si_numops++;
2360         }
2361
2362 out:
2363         op->o_bd->bd_info = (BackendInfo *)on;
2364         ldap_pvt_thread_pool_context_reset( thrctx );
2365         return 0;
2366 }
2367
2368 /* Write the current contextCSN into the underlying db.
2369  */
2370 static int
2371 syncprov_db_close(
2372     BackendDB *be
2373 )
2374 {
2375     slap_overinst   *on = (slap_overinst *) be->bd_info;
2376     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2377
2378         if ( slapMode & SLAP_TOOL_MODE ) {
2379                 return 0;
2380         }
2381         if ( si->si_numops ) {
2382                 Connection conn;
2383                 OperationBuffer opbuf;
2384                 Operation *op = (Operation *) &opbuf;
2385                 SlapReply rs = {REP_RESULT};
2386                 void *thrctx;
2387
2388                 thrctx = ldap_pvt_thread_pool_context();
2389                 connection_fake_init( &conn, op, thrctx );
2390                 op->o_bd = be;
2391                 op->o_dn = be->be_rootdn;
2392                 op->o_ndn = be->be_rootndn;
2393                 syncprov_checkpoint( op, &rs, on );
2394                 ldap_pvt_thread_pool_context_reset( thrctx );
2395         }
2396
2397     return 0;
2398 }
2399
2400 static int
2401 syncprov_db_init(
2402         BackendDB *be
2403 )
2404 {
2405         slap_overinst   *on = (slap_overinst *)be->bd_info;
2406         syncprov_info_t *si;
2407
2408         si = ch_calloc(1, sizeof(syncprov_info_t));
2409         on->on_bi.bi_private = si;
2410         ldap_pvt_thread_mutex_init( &si->si_csn_mutex );
2411         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
2412         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
2413         si->si_ctxcsn.bv_val = si->si_ctxcsnbuf;
2414
2415         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
2416         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
2417         csn_anlist[1].an_desc = slap_schema.si_ad_entryUUID;
2418         csn_anlist[1].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2419
2420         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
2421         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2422
2423         return 0;
2424 }
2425
2426 static int
2427 syncprov_db_destroy(
2428         BackendDB *be
2429 )
2430 {
2431         slap_overinst   *on = (slap_overinst *)be->bd_info;
2432         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2433
2434         if ( si ) {
2435                 if ( si->si_logs ) {
2436                         slog_entry *se = si->si_logs->sl_head;
2437
2438                         while ( se ) {
2439                                 slog_entry *se_next = se->se_next;
2440                                 ch_free( se );
2441                                 se = se_next;
2442                         }
2443
2444                         ch_free( si->si_logs );
2445                 }
2446                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
2447                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
2448                 ldap_pvt_thread_mutex_destroy( &si->si_csn_mutex );
2449                 ch_free( si );
2450         }
2451
2452         return 0;
2453 }
2454
2455 static int syncprov_parseCtrl (
2456         Operation *op,
2457         SlapReply *rs,
2458         LDAPControl *ctrl )
2459 {
2460         ber_tag_t tag;
2461         BerElementBuffer berbuf;
2462         BerElement *ber = (BerElement *)&berbuf;
2463         ber_int_t mode;
2464         ber_len_t len;
2465         struct berval cookie = BER_BVNULL;
2466         sync_control *sr;
2467         int rhint = 0;
2468
2469         if ( op->o_sync != SLAP_CONTROL_NONE ) {
2470                 rs->sr_text = "Sync control specified multiple times";
2471                 return LDAP_PROTOCOL_ERROR;
2472         }
2473
2474         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
2475                 rs->sr_text = "Sync control specified with pagedResults control";
2476                 return LDAP_PROTOCOL_ERROR;
2477         }
2478
2479         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
2480                 rs->sr_text = "Sync control value is empty (or absent)";
2481                 return LDAP_PROTOCOL_ERROR;
2482         }
2483
2484         /* Parse the control value
2485          *      syncRequestValue ::= SEQUENCE {
2486          *              mode   ENUMERATED {
2487          *                      -- 0 unused
2488          *                      refreshOnly             (1),
2489          *                      -- 2 reserved
2490          *                      refreshAndPersist       (3)
2491          *              },
2492          *              cookie  syncCookie OPTIONAL
2493          *      }
2494          */
2495
2496         ber_init2( ber, &ctrl->ldctl_value, 0 );
2497
2498         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
2499                 rs->sr_text = "Sync control : mode decoding error";
2500                 return LDAP_PROTOCOL_ERROR;
2501         }
2502
2503         switch( mode ) {
2504         case LDAP_SYNC_REFRESH_ONLY:
2505                 mode = SLAP_SYNC_REFRESH;
2506                 break;
2507         case LDAP_SYNC_REFRESH_AND_PERSIST:
2508                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
2509                 break;
2510         default:
2511                 rs->sr_text = "Sync control : unknown update mode";
2512                 return LDAP_PROTOCOL_ERROR;
2513         }
2514
2515         tag = ber_peek_tag( ber, &len );
2516
2517         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
2518                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
2519                         rs->sr_text = "Sync control : cookie decoding error";
2520                         return LDAP_PROTOCOL_ERROR;
2521                 }
2522                 tag = ber_peek_tag( ber, &len );
2523         }
2524         if ( tag == LDAP_TAG_RELOAD_HINT ) {
2525                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
2526                         rs->sr_text = "Sync control : rhint decoding error";
2527                         return LDAP_PROTOCOL_ERROR;
2528                 }
2529         }
2530         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
2531                         rs->sr_text = "Sync control : decoding error";
2532                         return LDAP_PROTOCOL_ERROR;
2533         }
2534         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
2535         sr->sr_rhint = rhint;
2536         if (!BER_BVISNULL(&cookie)) {
2537                 ber_dupbv_x( &sr->sr_state.octet_str, &cookie, op->o_tmpmemctx );
2538                 slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx );
2539                 if ( sr->sr_state.rid == -1 ) {
2540                         rs->sr_text = "Sync control : cookie parsing error";
2541                         return LDAP_PROTOCOL_ERROR;
2542                 }
2543         }
2544
2545         op->o_controls[slap_cids.sc_LDAPsync] = sr;
2546
2547         op->o_sync = ctrl->ldctl_iscritical
2548                 ? SLAP_CONTROL_CRITICAL
2549                 : SLAP_CONTROL_NONCRITICAL;
2550
2551         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
2552
2553         return LDAP_SUCCESS;
2554 }
2555
2556 /* This overlay is set up for dynamic loading via moduleload. For static
2557  * configuration, you'll need to arrange for the slap_overinst to be
2558  * initialized and registered by some other function inside slapd.
2559  */
2560
2561 static slap_overinst            syncprov;
2562
2563 int
2564 syncprov_initialize()
2565 {
2566         int rc;
2567
2568         rc = register_supported_control( LDAP_CONTROL_SYNC,
2569                 SLAP_CTRL_SEARCH, NULL,
2570                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
2571         if ( rc != LDAP_SUCCESS ) {
2572                 Debug( LDAP_DEBUG_ANY,
2573                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
2574                 return rc;
2575         }
2576
2577         syncprov.on_bi.bi_type = "syncprov";
2578         syncprov.on_bi.bi_db_init = syncprov_db_init;
2579         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
2580         syncprov.on_bi.bi_db_open = syncprov_db_open;
2581         syncprov.on_bi.bi_db_close = syncprov_db_close;
2582
2583         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
2584         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
2585
2586         syncprov.on_bi.bi_op_add = syncprov_op_mod;
2587         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
2588         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
2589         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
2590         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
2591         syncprov.on_bi.bi_op_search = syncprov_op_search;
2592         syncprov.on_bi.bi_extended = syncprov_op_extended;
2593         syncprov.on_bi.bi_operational = syncprov_operational;
2594
2595         syncprov.on_bi.bi_cf_ocs = spocs;
2596
2597         generic_filter.f_desc = slap_schema.si_ad_objectClass;
2598
2599         rc = config_register_schema( spcfg, spocs );
2600         if ( rc ) return rc;
2601
2602         return overlay_register( &syncprov );
2603 }
2604
2605 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
2606 int
2607 init_module( int argc, char *argv[] )
2608 {
2609         return syncprov_initialize();
2610 }
2611 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
2612
2613 #endif /* defined(SLAPD_OVER_SYNCPROV) */