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 2004-2005 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         time_t  si_chklast;     /* time of last checkpoint */
 126         Avlnode *si_mods;       /* entries being modified */
 127         sessionlog      *si_logs;
 128         ldap_pvt_thread_mutex_t si_csn_mutex;
 129         ldap_pvt_thread_mutex_t si_ops_mutex;
 130         ldap_pvt_thread_mutex_t si_mods_mutex;
 131         char            si_ctxcsnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 132 } syncprov_info_t;
 133
 134 typedef struct opcookie {
 135         slap_overinst *son;
 136         syncmatches *smatches;
 137         struct berval sdn;      /* DN of entry, for deletes */
 138         struct berval sndn;
 139         struct berval suuid;    /* UUID of entry */
 140         struct berval sctxcsn;
 141         int sreference; /* Is the entry a reference? */
 142 } opcookie;
 143
 144 typedef struct fbase_cookie {
 145         struct berval *fdn;     /* DN of a modified entry, for scope testing */
 146         syncops *fss;   /* persistent search we're testing against */
 147         int fbase;      /* if TRUE we found the search base and it's still valid */
 148         int fscope;     /* if TRUE then fdn is within the psearch scope */
 149 } fbase_cookie;
 150
 151 static AttributeName csn_anlist[3];
 152 static AttributeName uuid_anlist[2];
 153
 154 /* Build a LDAPsync intermediate state control */
 155 static int
 156 syncprov_state_ctrl(
 157         Operation       *op,
 158         SlapReply       *rs,
 159         Entry           *e,
 160         int             entry_sync_state,
 161         LDAPControl     **ctrls,
 162         int             num_ctrls,
 163         int             send_cookie,
 164         struct berval   *cookie )
 165 {
 166         Attribute* a;
 167         int ret;
 168
 169         BerElementBuffer berbuf;
 170         BerElement *ber = (BerElement *)&berbuf;
 171
 172         struct berval   entryuuid_bv = BER_BVNULL;
 173
 174         ber_init2( ber, 0, LBER_USE_DER );
 175         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 176
 177         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 178
 179         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 180                 AttributeDescription *desc = a->a_desc;
 181                 if ( desc == slap_schema.si_ad_entryUUID ) {
 182                         entryuuid_bv = a->a_nvals[0];
 183                         break;
 184                 }
 185         }
 186
 187         /* FIXME: what if entryuuid is NULL or empty ? */
 188
 189         if ( send_cookie && cookie ) {
 190                 ber_printf( ber, "{eOON}",
 191                         entry_sync_state, &entryuuid_bv, cookie );
 192         } else {
 193                 ber_printf( ber, "{eON}",
 194                         entry_sync_state, &entryuuid_bv );
 195         }
 196
 197         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 198         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 199         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 200
 201         ber_free_buf( ber );
 202
 203         if ( ret < 0 ) {
 204                 Debug( LDAP_DEBUG_TRACE,
 205                         "slap_build_sync_ctrl: ber_flatten2 failed\n",
 206                         0, 0, 0 );
 207                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 208                 return ret;
 209         }
 210
 211         return LDAP_SUCCESS;
 212 }
 213
 214 /* Build a LDAPsync final state control */
 215 static int
 216 syncprov_done_ctrl(
 217         Operation       *op,
 218         SlapReply       *rs,
 219         LDAPControl     **ctrls,
 220         int                     num_ctrls,
 221         int                     send_cookie,
 222         struct berval *cookie,
 223         int                     refreshDeletes )
 224 {
 225         int ret;
 226         BerElementBuffer berbuf;
 227         BerElement *ber = (BerElement *)&berbuf;
 228
 229         ber_init2( ber, NULL, LBER_USE_DER );
 230         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 231
 232         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 233
 234         ber_printf( ber, "{" );
 235         if ( send_cookie && cookie ) {
 236                 ber_printf( ber, "O", cookie );
 237         }
 238         if ( refreshDeletes == LDAP_SYNC_REFRESH_DELETES ) {
 239                 ber_printf( ber, "b", refreshDeletes );
 240         }
 241         ber_printf( ber, "N}" );
 242
 243         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_DONE;
 244         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 245         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 246
 247         ber_free_buf( ber );
 248
 249         if ( ret < 0 ) {
 250                 Debug( LDAP_DEBUG_TRACE,
 251                         "syncprov_done_ctrl: ber_flatten2 failed\n",
 252                         0, 0, 0 );
 253                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 254                 return ret;
 255         }
 256
 257         return LDAP_SUCCESS;
 258 }
 259
 260 static int
 261 syncprov_sendinfo(
 262         Operation       *op,
 263         SlapReply       *rs,
 264         int                     type,
 265         struct berval *cookie,
 266         int                     refreshDone,
 267         BerVarray       syncUUIDs,
 268         int                     refreshDeletes )
 269 {
 270         BerElementBuffer berbuf;
 271         BerElement *ber = (BerElement *)&berbuf;
 272         struct berval rspdata;
 273
 274         int ret;
 275
 276         ber_init2( ber, NULL, LBER_USE_DER );
 277         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 278
 279         if ( type ) {
 280                 switch ( type ) {
 281                 case LDAP_TAG_SYNC_NEW_COOKIE:
 282                         ber_printf( ber, "tO", type, cookie );
 283                         break;
 284                 case LDAP_TAG_SYNC_REFRESH_DELETE:
 285                 case LDAP_TAG_SYNC_REFRESH_PRESENT:
 286                         ber_printf( ber, "t{", type );
 287                         if ( cookie ) {
 288                                 ber_printf( ber, "O", cookie );
 289                         }
 290                         if ( refreshDone == 0 ) {
 291                                 ber_printf( ber, "b", refreshDone );
 292                         }
 293                         ber_printf( ber, "N}" );
 294                         break;
 295                 case LDAP_TAG_SYNC_ID_SET:
 296                         ber_printf( ber, "t{", type );
 297                         if ( cookie ) {
 298                                 ber_printf( ber, "O", cookie );
 299                         }
 300                         if ( refreshDeletes == 1 ) {
 301                                 ber_printf( ber, "b", refreshDeletes );
 302                         }
 303                         ber_printf( ber, "[W]", syncUUIDs );
 304                         ber_printf( ber, "N}" );
 305                         break;
 306                 default:
 307                         Debug( LDAP_DEBUG_TRACE,
 308                                 "syncprov_sendinfo: invalid syncinfo type (%d)\n",
 309                                 type, 0, 0 );
 310                         return LDAP_OTHER;
 311                 }
 312         }
 313
 314         ret = ber_flatten2( ber, &rspdata, 0 );
 315
 316         if ( ret < 0 ) {
 317                 Debug( LDAP_DEBUG_TRACE,
 318                         "syncprov_sendinfo: ber_flatten2 failed\n",
 319                         0, 0, 0 );
 320                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 321                 return ret;
 322         }
 323
 324         rs->sr_rspoid = LDAP_SYNC_INFO;
 325         rs->sr_rspdata = &rspdata;
 326         send_ldap_intermediate( op, rs );
 327         rs->sr_rspdata = NULL;
 328         ber_free_buf( ber );
 329
 330         return LDAP_SUCCESS;
 331 }
 332
 333 /* Find a modtarget in an AVL tree */
 334 static int
 335 sp_avl_cmp( const void *c1, const void *c2 )
 336 {
 337         const modtarget *m1, *m2;
 338         int rc;
 339
 340         m1 = c1; m2 = c2;
 341         rc = m1->mt_op->o_req_ndn.bv_len - m2->mt_op->o_req_ndn.bv_len;
 342
 343         if ( rc ) return rc;
 344         return ber_bvcmp( &m1->mt_op->o_req_ndn, &m2->mt_op->o_req_ndn );
 345 }
 346
 347 /* syncprov_findbase:
 348  *   finds the true DN of the base of a search (with alias dereferencing) and
 349  * checks to make sure the base entry doesn't get replaced with a different
 350  * entry (e.g., swapping trees via ModDN, or retargeting an alias). If a
 351  * change is detected, any persistent search on this base must be terminated /
 352  * reloaded.
 353  *   On the first call, we just save the DN and entryID. On subsequent calls
 354  * we compare the DN and entryID with the saved values.
 355  */
 356 static int
 357 findbase_cb( Operation *op, SlapReply *rs )
 358 {
 359         slap_callback *sc = op->o_callback;
 360
 361         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 362                 fbase_cookie *fc = sc->sc_private;
 363
 364                 /* If no entryID, we're looking for the first time.
 365                  * Just store whatever we got.
 366                  */
 367                 if ( fc->fss->s_eid == NOID ) {
 368                         fc->fbase = 2;
 369                         fc->fss->s_eid = rs->sr_entry->e_id;
 370                         ber_dupbv( &fc->fss->s_base, &rs->sr_entry->e_nname );
 371
 372                 } else if ( rs->sr_entry->e_id == fc->fss->s_eid &&
 373                         dn_match( &rs->sr_entry->e_nname, &fc->fss->s_base )) {
 374
 375                 /* OK, the DN is the same and the entryID is the same. */
 376                         fc->fbase = 1;
 377                 }
 378         }
 379         if ( rs->sr_err != LDAP_SUCCESS ) {
 380                 Debug( LDAP_DEBUG_ANY, "findbase failed! %d\n", rs->sr_err,0,0 );
 381         }
 382         return LDAP_SUCCESS;
 383 }
 384
 385 static int
 386 syncprov_findbase( Operation *op, fbase_cookie *fc )
 387 {
 388         opcookie *opc = op->o_callback->sc_private;
 389         slap_overinst *on = opc->son;
 390
 391         /* Use basic parameters from syncrepl search, but use
 392          * current op's threadctx / tmpmemctx
 393          */
 394         ldap_pvt_thread_mutex_lock( &fc->fss->s_mutex );
 395         if ( fc->fss->s_flags & PS_FIND_BASE ) {
 396                 slap_callback cb = {0};
 397                 Operation fop;
 398                 SlapReply frs = { REP_RESULT };
 399                 int rc;
 400
 401                 fc->fss->s_flags ^= PS_FIND_BASE;
 402                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 403
 404                 fop = *fc->fss->s_op;
 405
 406                 fop.o_hdr = op->o_hdr;
 407                 fop.o_bd = op->o_bd;
 408                 fop.o_time = op->o_time;
 409                 fop.o_tincr = op->o_tincr;
 410
 411                 cb.sc_response = findbase_cb;
 412                 cb.sc_private = fc;
 413
 414                 fop.o_sync_mode = 0;    /* turn off sync mode */
 415                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 416                 fop.o_callback = &cb;
 417                 fop.o_tag = LDAP_REQ_SEARCH;
 418                 fop.ors_scope = LDAP_SCOPE_BASE;
 419                 fop.ors_limit = NULL;
 420                 fop.ors_slimit = 1;
 421                 fop.ors_tlimit = SLAP_NO_LIMIT;
 422                 fop.ors_attrs = slap_anlist_no_attrs;
 423                 fop.ors_attrsonly = 1;
 424
 425                 fop.o_bd->bd_info = on->on_info->oi_orig;
 426                 rc = fop.o_bd->be_search( &fop, &frs );
 427                 fop.o_bd->bd_info = (BackendInfo *)on;
 428         } else {
 429                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 430                 fc->fbase = 1;
 431         }
 432
 433         /* After the first call, see if the fdn resides in the scope */
 434         if ( fc->fbase == 1 ) {
 435                 switch ( fc->fss->s_op->ors_scope ) {
 436                 case LDAP_SCOPE_BASE:
 437                         fc->fscope = dn_match( fc->fdn, &fc->fss->s_base );
 438                         break;
 439                 case LDAP_SCOPE_ONELEVEL: {
 440                         struct berval pdn;
 441                         dnParent( fc->fdn, &pdn );
 442                         fc->fscope = dn_match( &pdn, &fc->fss->s_base );
 443                         break; }
 444                 case LDAP_SCOPE_SUBTREE:
 445                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base );
 446                         break;
 447 #ifdef LDAP_SCOPE_SUBORDINATE
 448                 case LDAP_SCOPE_SUBORDINATE:
 449                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base ) &&
 450                                 !dn_match( fc->fdn, &fc->fss->s_base );
 451                         break;
 452 #endif
 453                 }
 454         }
 455
 456         if ( fc->fbase )
 457                 return LDAP_SUCCESS;
 458
 459         /* If entryID has changed, then the base of this search has
 460          * changed. Invalidate the psearch.
 461          */
 462         return LDAP_NO_SUCH_OBJECT;
 463 }
 464
 465 /* syncprov_findcsn:
 466  *   This function has three different purposes, but they all use a search
 467  * that filters on entryCSN so they're combined here.
 468  * 1: at startup time, after a contextCSN has been read from the database,
 469  * we search for all entries with CSN >= contextCSN in case the contextCSN
 470  * was not checkpointed at the previous shutdown.
 471  *
 472  * 2: when the current contextCSN is known and we have a sync cookie, we search
 473  * for one entry with CSN = the cookie CSN. If not found, try <= cookie CSN.
 474  * If an entry is found, the cookie CSN is valid, otherwise it is stale.
 475  *
 476  * 3: during a refresh phase, we search for all entries with CSN <= the cookie
 477  * CSN, and generate Present records for them. We always collect this result
 478  * in SyncID sets, even if there's only one match.
 479  */
 480 #define FIND_MAXCSN     1
 481 #define FIND_CSN        2
 482 #define FIND_PRESENT    3
 483
 484 static int
 485 findmax_cb( Operation *op, SlapReply *rs )
 486 {
 487         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 488                 struct berval *maxcsn = op->o_callback->sc_private;
 489                 Attribute *a = attr_find( rs->sr_entry->e_attrs,
 490                         slap_schema.si_ad_entryCSN );
 491
 492                 if ( a && ber_bvcmp( &a->a_vals[0], maxcsn ) > 0 ) {
 493                         maxcsn->bv_len = a->a_vals[0].bv_len;
 494                         strcpy( maxcsn->bv_val, a->a_vals[0].bv_val );
 495                 }
 496         }
 497         return LDAP_SUCCESS;
 498 }
 499
 500 static int
 501 findcsn_cb( Operation *op, SlapReply *rs )
 502 {
 503         slap_callback *sc = op->o_callback;
 504
 505         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 506                 sc->sc_private = (void *)1;
 507         }
 508         return LDAP_SUCCESS;
 509 }
 510
 511 /* Build a list of entryUUIDs for sending in a SyncID set */
 512
 513 #define UUID_LEN        16
 514
 515 typedef struct fpres_cookie {
 516         int num;
 517         BerVarray uuids;
 518         char *last;
 519 } fpres_cookie;
 520
 521 static int
 522 findpres_cb( Operation *op, SlapReply *rs )
 523 {
 524         slap_callback *sc = op->o_callback;
 525         fpres_cookie *pc = sc->sc_private;
 526         Attribute *a;
 527         int ret = SLAP_CB_CONTINUE;
 528
 529         switch ( rs->sr_type ) {
 530         case REP_SEARCH:
 531                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryUUID );
 532                 if ( a ) {
 533                         pc->uuids[pc->num].bv_val = pc->last;
 534                         AC_MEMCPY( pc->uuids[pc->num].bv_val, a->a_nvals[0].bv_val,
 535                                 pc->uuids[pc->num].bv_len );
 536                         pc->num++;
 537                         pc->last = pc->uuids[pc->num].bv_val;
 538                         pc->uuids[pc->num].bv_val = NULL;
 539                 }
 540                 ret = LDAP_SUCCESS;
 541                 if ( pc->num != SLAP_SYNCUUID_SET_SIZE )
 542                         break;
 543                 /* FALLTHRU */
 544         case REP_RESULT:
 545                 ret = rs->sr_err;
 546                 if ( pc->num ) {
 547                         ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 548                                 0, pc->uuids, 0 );
 549                         pc->uuids[pc->num].bv_val = pc->last;
 550                         pc->num = 0;
 551                         pc->last = pc->uuids[0].bv_val;
 552                 }
 553                 break;
 554         default:
 555                 break;
 556         }
 557         return ret;
 558 }
 559
 560 static int
 561 syncprov_findcsn( Operation *op, int mode )
 562 {
 563         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 564         syncprov_info_t         *si = on->on_bi.bi_private;
 565
 566         slap_callback cb = {0};
 567         Operation fop;
 568         SlapReply frs = { REP_RESULT };
 569         char buf[LDAP_LUTIL_CSNSTR_BUFSIZE + STRLENOF("(entryCSN<=)")];
 570         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 571         struct berval maxcsn;
 572         Filter cf, af;
 573 #ifdef LDAP_COMP_MATCH
 574         AttributeAssertion eq = { NULL, BER_BVNULL, NULL };
 575 #else
 576         AttributeAssertion eq = { NULL, BER_BVNULL };
 577 #endif
 578         int i, rc = LDAP_SUCCESS;
 579         fpres_cookie pcookie;
 580         sync_control *srs = NULL;
 581         int findcsn_retry = 1;
 582
 583         if ( mode != FIND_MAXCSN ) {
 584                 srs = op->o_controls[slap_cids.sc_LDAPsync];
 585
 586                 if ( srs->sr_state.ctxcsn.bv_len >= LDAP_LUTIL_CSNSTR_BUFSIZE ) {
 587                         return LDAP_OTHER;
 588                 }
 589         }
 590
 591         fop = *op;
 592         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync_mode */
 593         /* We want pure entries, not referrals */
 594         fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 595
 596         cf.f_ava = &eq;
 597         cf.f_av_desc = slap_schema.si_ad_entryCSN;
 598         cf.f_next = NULL;
 599
 600         fop.o_callback = &cb;
 601         fop.ors_limit = NULL;
 602         fop.ors_tlimit = SLAP_NO_LIMIT;
 603         fop.ors_filter = &cf;
 604         fop.ors_filterstr.bv_val = buf;
 605
 606 again:
 607         switch( mode ) {
 608         case FIND_MAXCSN:
 609                 cf.f_choice = LDAP_FILTER_GE;
 610                 cf.f_av_value = si->si_ctxcsn;
 611                 fop.ors_filterstr.bv_len = sprintf( buf, "(entryCSN>=%s)",
 612                         cf.f_av_value.bv_val );
 613                 fop.ors_attrsonly = 0;
 614                 fop.ors_attrs = csn_anlist;
 615                 fop.ors_slimit = SLAP_NO_LIMIT;
 616                 cb.sc_private = &maxcsn;
 617                 cb.sc_response = findmax_cb;
 618                 strcpy( cbuf, si->si_ctxcsn.bv_val );
 619                 maxcsn.bv_val = cbuf;
 620                 maxcsn.bv_len = si->si_ctxcsn.bv_len;
 621                 break;
 622         case FIND_CSN:
 623                 cf.f_av_value = srs->sr_state.ctxcsn;
 624                 /* Look for exact match the first time */
 625                 if ( findcsn_retry ) {
 626                         cf.f_choice = LDAP_FILTER_EQUALITY;
 627                         fop.ors_filterstr.bv_len = sprintf( buf, "(entryCSN=%s)",
 628                                 cf.f_av_value.bv_val );
 629                 /* On retry, look for <= */
 630                 } else {
 631                         cf.f_choice = LDAP_FILTER_LE;
 632                         fop.ors_filterstr.bv_len = sprintf( buf, "(entryCSN<=%s)",
 633                                 cf.f_av_value.bv_val );
 634                 }
 635                 fop.ors_attrsonly = 1;
 636                 fop.ors_attrs = slap_anlist_no_attrs;
 637                 fop.ors_slimit = 1;
 638                 cb.sc_private = NULL;
 639                 cb.sc_response = findcsn_cb;
 640                 break;
 641         case FIND_PRESENT:
 642                 af.f_choice = LDAP_FILTER_AND;
 643                 af.f_next = NULL;
 644                 af.f_and = &cf;
 645                 cf.f_choice = LDAP_FILTER_LE;
 646                 cf.f_av_value = srs->sr_state.ctxcsn;
 647                 cf.f_next = op->ors_filter;
 648                 fop.ors_filter = &af;
 649                 filter2bv_x( &fop, fop.ors_filter, &fop.ors_filterstr );
 650                 fop.ors_attrsonly = 0;
 651                 fop.ors_attrs = uuid_anlist;
 652                 fop.ors_slimit = SLAP_NO_LIMIT;
 653                 cb.sc_private = &pcookie;
 654                 cb.sc_response = findpres_cb;
 655                 pcookie.num = 0;
 656
 657                 /* preallocate storage for a full set */
 658                 pcookie.uuids = op->o_tmpalloc( (SLAP_SYNCUUID_SET_SIZE+1) *
 659                         sizeof(struct berval) + SLAP_SYNCUUID_SET_SIZE * UUID_LEN,
 660                         op->o_tmpmemctx );
 661                 pcookie.last = (char *)(pcookie.uuids + SLAP_SYNCUUID_SET_SIZE+1);
 662                 pcookie.uuids[0].bv_val = pcookie.last;
 663                 pcookie.uuids[0].bv_len = UUID_LEN;
 664                 for (i=1; i<SLAP_SYNCUUID_SET_SIZE; i++) {
 665                         pcookie.uuids[i].bv_val = pcookie.uuids[i-1].bv_val + UUID_LEN;
 666                         pcookie.uuids[i].bv_len = UUID_LEN;
 667                 }
 668                 break;
 669         }
 670
 671         fop.o_bd->bd_info = on->on_info->oi_orig;
 672         fop.o_bd->be_search( &fop, &frs );
 673         fop.o_bd->bd_info = (BackendInfo *)on;
 674
 675         switch( mode ) {
 676         case FIND_MAXCSN:
 677                 strcpy( si->si_ctxcsnbuf, maxcsn.bv_val );
 678                 si->si_ctxcsn.bv_len = maxcsn.bv_len;
 679                 break;
 680         case FIND_CSN:
 681                 /* If matching CSN was not found, invalidate the context. */
 682                 if ( !cb.sc_private ) {
 683                         /* If we didn't find an exact match, then try for <= */
 684                         if ( findcsn_retry ) {
 685                                 findcsn_retry = 0;
 686                                 goto again;
 687                         }
 688                         rc = LDAP_NO_SUCH_OBJECT;
 689                 }
 690                 break;
 691         case FIND_PRESENT:
 692                 op->o_tmpfree( pcookie.uuids, op->o_tmpmemctx );
 693                 op->o_tmpfree( fop.ors_filterstr.bv_val, op->o_tmpmemctx );
 694                 break;
 695         }
 696
 697         return rc;
 698 }
 699
 700 static void
 701 syncprov_free_syncop( syncops *so )
 702 {
 703         syncres *sr, *srnext;
 704         GroupAssertion *ga, *gnext;
 705
 706         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 707         if ( --so->s_inuse > 0 ) {
 708                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 709                 return;
 710         }
 711         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 712         if ( so->s_flags & PS_IS_DETACHED ) {
 713                 filter_free( so->s_op->ors_filter );
 714                 for ( ga = so->s_op->o_groups; ga; ga=gnext ) {
 715                         gnext = ga->ga_next;
 716                         ch_free( ga );
 717                 }
 718                 ch_free( so->s_op );
 719         }
 720         ch_free( so->s_base.bv_val );
 721         for ( sr=so->s_res; sr; sr=srnext ) {
 722                 srnext = sr->s_next;
 723                 ch_free( sr );
 724         }
 725         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 726         ch_free( so );
 727 }
 728
 729 /* Send a persistent search response */
 730 static int
 731 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so, Entry **e, int mode)
 732 {
 733         slap_overinst *on = opc->son;
 734
 735         SlapReply rs = { REP_SEARCH };
 736         LDAPControl *ctrls[2];
 737         struct berval cookie;
 738         Entry e_uuid = {0};
 739         Attribute a_uuid = {0};
 740
 741         if ( so->s_op->o_abandon )
 742                 return SLAPD_ABANDON;
 743
 744         ctrls[1] = NULL;
 745         slap_compose_sync_cookie( op, &cookie, &opc->sctxcsn, so->s_rid );
 746
 747         e_uuid.e_attrs = &a_uuid;
 748         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 749         a_uuid.a_nvals = &opc->suuid;
 750         rs.sr_err = syncprov_state_ctrl( op, &rs, &e_uuid,
 751                 mode, ctrls, 0, 1, &cookie );
 752
 753         rs.sr_ctrls = ctrls;
 754         op->o_bd->bd_info = (BackendInfo *)on->on_info;
 755         switch( mode ) {
 756         case LDAP_SYNC_ADD:
 757                 rs.sr_entry = *e;
 758                 if ( rs.sr_entry->e_private )
 759                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 760                 if ( opc->sreference ) {
 761                         rs.sr_ref = get_entry_referrals( op, rs.sr_entry );
 762                         send_search_reference( op, &rs );
 763                         ber_bvarray_free( rs.sr_ref );
 764                         if ( !rs.sr_entry )
 765                                 *e = NULL;
 766                         break;
 767                 }
 768                 /* fallthru */
 769         case LDAP_SYNC_MODIFY:
 770                 rs.sr_entry = *e;
 771                 if ( rs.sr_entry->e_private )
 772                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 773                 rs.sr_attrs = op->ors_attrs;
 774                 send_search_entry( op, &rs );
 775                 if ( !rs.sr_entry )
 776                         *e = NULL;
 777                 break;
 778         case LDAP_SYNC_DELETE:
 779                 e_uuid.e_attrs = NULL;
 780                 e_uuid.e_name = opc->sdn;
 781                 e_uuid.e_nname = opc->sndn;
 782                 rs.sr_entry = &e_uuid;
 783                 if ( opc->sreference ) {
 784                         struct berval bv = BER_BVNULL;
 785                         rs.sr_ref = &bv;
 786                         send_search_reference( op, &rs );
 787                 } else {
 788                         send_search_entry( op, &rs );
 789                 }
 790                 break;
 791         default:
 792                 assert(0);
 793         }
 794         /* In case someone else freed it already? */
 795         if ( rs.sr_ctrls ) {
 796                 op->o_tmpfree( rs.sr_ctrls[0], op->o_tmpmemctx );
 797                 rs.sr_ctrls = NULL;
 798         }
 799
 800         return rs.sr_err;
 801 }
 802
 803 /* Play back queued responses */
 804 static int
 805 syncprov_qplay( Operation *op, slap_overinst *on, syncops *so )
 806 {
 807         syncres *sr;
 808         Entry *e;
 809         opcookie opc;
 810         int rc;
 811
 812         opc.son = on;
 813         op->o_bd->bd_info = (BackendInfo *)on->on_info;
 814
 815         for (;;) {
 816                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 817                 sr = so->s_res;
 818                 if ( sr )
 819                         so->s_res = sr->s_next;
 820                 if ( !so->s_res )
 821                         so->s_restail = NULL;
 822                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 823
 824                 if ( !sr || so->s_op->o_abandon )
 825                         break;
 826
 827                 opc.sdn = sr->s_dn;
 828                 opc.sndn = sr->s_ndn;
 829                 opc.suuid = sr->s_uuid;
 830                 opc.sctxcsn = sr->s_csn;
 831                 opc.sreference = sr->s_isreference;
 832                 e = NULL;
 833
 834                 if ( sr->s_mode != LDAP_SYNC_DELETE ) {
 835                         rc = be_entry_get_rw( op, &opc.sndn, NULL, NULL, 0, &e );
 836                         if ( rc ) {
 837                                 ch_free( sr );
 838                                 continue;
 839                         }
 840                 }
 841                 rc = syncprov_sendresp( op, &opc, so, &e, sr->s_mode );
 842
 843                 if ( e ) {
 844                         be_entry_release_rw( op, e, 0 );
 845                 }
 846
 847                 ch_free( sr );
 848
 849                 if ( rc )
 850                         break;
 851         }
 852         op->o_bd->bd_info = (BackendInfo *)on;
 853         return rc;
 854 }
 855
 856 /* runqueue task for playing back queued responses */
 857 static void *
 858 syncprov_qtask( void *ctx, void *arg )
 859 {
 860         struct re_s *rtask = arg;
 861         syncops *so = rtask->arg;
 862         slap_overinst *on = so->s_op->o_private;
 863         char opbuf[OPERATION_BUFFER_SIZE];
 864         Operation *op;
 865         BackendDB be;
 866
 867         op = (Operation *)opbuf;
 868         *op = *so->s_op;
 869         op->o_hdr = (Opheader *)(op+1);
 870         op->o_controls = (void **)(op->o_hdr+1);
 871         memset( op->o_controls, 0, SLAP_MAX_CIDS * sizeof(void *));
 872
 873         *op->o_hdr = *so->s_op->o_hdr;
 874
 875         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx);
 876         op->o_tmpmfuncs = &slap_sl_mfuncs;
 877         op->o_threadctx = ctx;
 878
 879         /* syncprov_qplay expects a fake db */
 880         be = *so->s_op->o_bd;
 881         be.be_flags |= SLAP_DBFLAG_OVERLAY;
 882         op->o_bd = &be;
 883         op->o_private = NULL;
 884         op->o_callback = NULL;
 885
 886         syncprov_qplay( op, on, so );
 887
 888         /* decrement use count... */
 889         syncprov_free_syncop( so );
 890
 891         /* wait until we get explicitly scheduled again */
 892         ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
 893         ldap_pvt_runqueue_stoptask( &slapd_rq, so->s_qtask );
 894         ldap_pvt_runqueue_resched( &slapd_rq, so->s_qtask, 1 );
 895         ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
 896
 897         return NULL;
 898 }
 899
 900 /* Queue a persistent search response */
 901 static int
 902 syncprov_qresp( opcookie *opc, syncops *so, int mode )
 903 {
 904         syncres *sr;
 905
 906         sr = ch_malloc(sizeof(syncres) + opc->suuid.bv_len + 1 +
 907                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1 + opc->sctxcsn.bv_len + 1 );
 908         sr->s_next = NULL;
 909         sr->s_dn.bv_val = (char *)(sr + 1);
 910         sr->s_dn.bv_len = opc->sdn.bv_len;
 911         sr->s_mode = mode;
 912         sr->s_isreference = opc->sreference;
 913         sr->s_ndn.bv_val = lutil_strcopy( sr->s_dn.bv_val, opc->sdn.bv_val );
 914         sr->s_ndn.bv_len = opc->sndn.bv_len;
 915         *(sr->s_ndn.bv_val++) = '\0';
 916         sr->s_uuid.bv_val = lutil_strcopy( sr->s_ndn.bv_val, opc->sndn.bv_val );
 917         sr->s_uuid.bv_len = opc->suuid.bv_len;
 918         *(sr->s_uuid.bv_val++) = '\0';
 919         sr->s_csn.bv_val = lutil_strcopy( sr->s_uuid.bv_val, opc->suuid.bv_val );
 920         sr->s_csn.bv_len = opc->sctxcsn.bv_len;
 921         strcpy( sr->s_csn.bv_val, opc->sctxcsn.bv_val );
 922
 923         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 924         if ( !so->s_res ) {
 925                 so->s_res = sr;
 926         } else {
 927                 so->s_restail->s_next = sr;
 928         }
 929         so->s_restail = sr;
 930
 931         /* If the base of the psearch was modified, check it next time round */
 932         if ( so->s_flags & PS_WROTE_BASE ) {
 933                 so->s_flags ^= PS_WROTE_BASE;
 934                 so->s_flags |= PS_FIND_BASE;
 935         }
 936         if ( so->s_flags & PS_IS_DETACHED ) {
 937                 ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
 938                 if ( !so->s_qtask ) {
 939                         so->s_qtask = ldap_pvt_runqueue_insert( &slapd_rq, RUNQ_INTERVAL,
 940                                 syncprov_qtask, so, "syncprov_qtask",
 941                                 so->s_op->o_conn->c_peer_name.bv_val );
 942                         ++so->s_inuse;
 943                 } else {
 944                         if (!ldap_pvt_runqueue_isrunning( &slapd_rq, so->s_qtask ) &&
 945                                 !so->s_qtask->next_sched.tv_sec ) {
 946                                 so->s_qtask->interval.tv_sec = 0;
 947                                 ldap_pvt_runqueue_resched( &slapd_rq, so->s_qtask, 0 );
 948                                 so->s_qtask->interval.tv_sec = RUNQ_INTERVAL;
 949                                 ++so->s_inuse;
 950                         }
 951                 }
 952                 ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
 953         }
 954         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 955         return LDAP_SUCCESS;
 956 }
 957
 958 static int
 959 syncprov_drop_psearch( syncops *so, int lock )
 960 {
 961         if ( so->s_flags & PS_IS_DETACHED ) {
 962                 if ( lock )
 963                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
 964                 so->s_op->o_conn->c_n_ops_executing--;
 965                 so->s_op->o_conn->c_n_ops_completed++;
 966                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, slap_op,
 967                         o_next );
 968                 if ( lock )
 969                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
 970         }
 971         syncprov_free_syncop( so );
 972
 973         return 0;
 974 }
 975
 976 static int
 977 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
 978 {
 979         slap_callback *sc = op->o_callback;
 980         op->o_callback = sc->sc_next;
 981         syncprov_drop_psearch( op->o_callback->sc_private, 0 );
 982         op->o_tmpfree( sc, op->o_tmpmemctx );
 983         return 0;
 984 }
 985
 986 static int
 987 syncprov_op_abandon( Operation *op, SlapReply *rs )
 988 {
 989         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 990         syncprov_info_t         *si = on->on_bi.bi_private;
 991         syncops *so, *soprev;
 992
 993         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
 994         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
 995                 soprev=so, so=so->s_next ) {
 996                 if ( so->s_op->o_connid == op->o_connid &&
 997                         so->s_op->o_msgid == op->orn_msgid ) {
 998                                 so->s_op->o_abandon = 1;
 999                                 soprev->s_next = so->s_next;
1000                                 break;
1001                 }
1002         }
1003         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1004         if ( so ) {
1005                 /* Is this really a Cancel exop? */
1006                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
1007                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
1008                         rs->sr_err = LDAP_CANCELLED;
1009                         send_ldap_result( so->s_op, rs );
1010                         if ( so->s_flags & PS_IS_DETACHED ) {
1011                                 slap_callback *cb;
1012                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
1013                                 cb->sc_cleanup = syncprov_ab_cleanup;
1014                                 cb->sc_next = op->o_callback;
1015                                 cb->sc_private = so;
1016                                 return SLAP_CB_CONTINUE;
1017                         }
1018                 }
1019                 syncprov_drop_psearch( so, 0 );
1020         }
1021         return SLAP_CB_CONTINUE;
1022 }
1023
1024 /* Find which persistent searches are affected by this operation */
1025 static void
1026 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
1027 {
1028         slap_overinst *on = opc->son;
1029         syncprov_info_t         *si = on->on_bi.bi_private;
1030
1031         fbase_cookie fc;
1032         syncops *ss, *sprev, *snext;
1033         Entry *e;
1034         Attribute *a;
1035         int rc;
1036         struct berval newdn;
1037         int freefdn = 0;
1038
1039         fc.fdn = &op->o_req_ndn;
1040         /* compute new DN */
1041         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1042                 struct berval pdn;
1043                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
1044                 else dnParent( fc.fdn, &pdn );
1045                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
1046                 fc.fdn = &newdn;
1047                 freefdn = 1;
1048         }
1049         if ( op->o_tag != LDAP_REQ_ADD ) {
1050                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
1051                 rc = be_entry_get_rw( op, fc.fdn, NULL, NULL, 0, &e );
1052                 /* If we're sending responses now, make a copy and unlock the DB */
1053                 if ( e && !saveit ) {
1054                         Entry *e2 = entry_dup( e );
1055                         be_entry_release_rw( op, e, 0 );
1056                         e = e2;
1057                 }
1058                 op->o_bd->bd_info = (BackendInfo *)on;
1059                 if ( rc ) return;
1060         } else {
1061                 e = op->ora_e;
1062         }
1063
1064         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1065                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1066                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1067                 opc->sreference = is_entry_referral( e );
1068                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1069                 if ( a )
1070                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1071         } else if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1072                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1073                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1074                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1075                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1076         }
1077
1078         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1079         for (ss = si->si_ops, sprev = (syncops *)&si->si_ops; ss;
1080                 sprev = ss, ss=snext)
1081         {
1082                 syncmatches *sm;
1083                 int found = 0;
1084
1085                 snext = ss->s_next;
1086                 /* validate base */
1087                 fc.fss = ss;
1088                 fc.fbase = 0;
1089                 fc.fscope = 0;
1090
1091                 /* If the base of the search is missing, signal a refresh */
1092                 rc = syncprov_findbase( op, &fc );
1093                 if ( rc != LDAP_SUCCESS ) {
1094                         SlapReply rs = {REP_RESULT};
1095                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1096                                 "search base has changed" );
1097                         sprev->s_next = snext;
1098                         syncprov_drop_psearch( ss, 1 );
1099                         ss = sprev;
1100                         continue;
1101                 }
1102
1103
1104                 /* If we're sending results now, look for this op in old matches */
1105                 if ( !saveit ) {
1106                         syncmatches *old;
1107
1108                         /* Did we modify the search base? */
1109                         if ( dn_match( &op->o_req_ndn, &ss->s_base )) {
1110                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1111                                 ss->s_flags |= PS_WROTE_BASE;
1112                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1113                         }
1114
1115                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1116                                 old=sm, sm=sm->sm_next ) {
1117                                 if ( sm->sm_op == ss ) {
1118                                         found = 1;
1119                                         old->sm_next = sm->sm_next;
1120                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1121                                         break;
1122                                 }
1123                         }
1124                 }
1125
1126                 /* check if current o_req_dn is in scope and matches filter */
1127                 if ( fc.fscope && test_filter( op, e, ss->s_op->ors_filter ) ==
1128                         LDAP_COMPARE_TRUE ) {
1129                         if ( saveit ) {
1130                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1131                                 sm->sm_next = opc->smatches;
1132                                 sm->sm_op = ss;
1133                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1134                                 ++ss->s_inuse;
1135                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1136                                 opc->smatches = sm;
1137                         } else {
1138                                 /* if found send UPDATE else send ADD */
1139                                 syncprov_qresp( opc, ss,
1140                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD );
1141                         }
1142                 } else if ( !saveit && found ) {
1143                         /* send DELETE */
1144                         syncprov_qresp( opc, ss, LDAP_SYNC_DELETE );
1145                 }
1146         }
1147         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1148
1149         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1150                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
1151                 be_entry_release_rw( op, e, 0 );
1152                 op->o_bd->bd_info = (BackendInfo *)on;
1153         }
1154         if ( freefdn ) {
1155                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1156         }
1157 }
1158
1159 static int
1160 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1161 {
1162         slap_callback *cb = op->o_callback;
1163         opcookie *opc = cb->sc_private;
1164         slap_overinst *on = opc->son;
1165         syncprov_info_t         *si = on->on_bi.bi_private;
1166         syncmatches *sm, *snext;
1167         modtarget *mt, mtdummy;
1168
1169         for (sm = opc->smatches; sm; sm=snext) {
1170                 snext = sm->sm_next;
1171                 syncprov_free_syncop( sm->sm_op );
1172                 op->o_tmpfree( sm, op->o_tmpmemctx );
1173         }
1174
1175         /* Remove op from lock table */
1176         mtdummy.mt_op = op;
1177         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1178         mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1179         if ( mt ) {
1180                 modinst *mi = mt->mt_mods;
1181
1182                 /* If there are more, promote the next one */
1183                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1184                 if ( mi->mi_next ) {
1185                         mt->mt_mods = mi->mi_next;
1186                         mt->mt_op = mt->mt_mods->mi_op;
1187                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1188                 } else {
1189                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1190                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1191                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1192                         ch_free( mt );
1193                 }
1194         }
1195         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1196         if ( !BER_BVISNULL( &opc->suuid ))
1197                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1198         if ( !BER_BVISNULL( &opc->sndn ))
1199                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1200         if ( !BER_BVISNULL( &opc->sdn ))
1201                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1202         op->o_callback = cb->sc_next;
1203         op->o_tmpfree(cb, op->o_tmpmemctx);
1204
1205         return 0;
1206 }
1207
1208 static void
1209 syncprov_checkpoint( Operation *op, SlapReply *rs, slap_overinst *on )
1210 {
1211         syncprov_info_t         *si = on->on_bi.bi_private;
1212         Modifications mod;
1213         Operation opm;
1214         struct berval bv[2];
1215         slap_callback cb = {0};
1216         int manage = get_manageDSAit(op);
1217
1218         mod.sml_values = bv;
1219         bv[1].bv_val = NULL;
1220         bv[0] = si->si_ctxcsn;
1221         mod.sml_nvalues = NULL;
1222         mod.sml_desc = slap_schema.si_ad_contextCSN;
1223         mod.sml_op = LDAP_MOD_REPLACE;
1224         mod.sml_flags = 0;
1225         mod.sml_next = NULL;
1226
1227         cb.sc_response = slap_null_cb;
1228         opm = *op;
1229         opm.o_tag = LDAP_REQ_MODIFY;
1230         opm.o_callback = &cb;
1231         opm.orm_modlist = &mod;
1232         opm.o_req_dn = op->o_bd->be_suffix[0];
1233         opm.o_req_ndn = op->o_bd->be_nsuffix[0];
1234         opm.o_bd->bd_info = on->on_info->oi_orig;
1235         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1236         opm.o_bd->be_modify( &opm, rs );
1237         opm.o_managedsait = manage;
1238 }
1239
1240 static void
1241 syncprov_add_slog( Operation *op, struct berval *csn )
1242 {
1243         opcookie *opc = op->o_callback->sc_private;
1244         slap_overinst *on = opc->son;
1245         syncprov_info_t         *si = on->on_bi.bi_private;
1246         sessionlog *sl;
1247         slog_entry *se;
1248
1249         sl = si->si_logs;
1250         {
1251                 /* Allocate a record. UUIDs are not NUL-terminated. */
1252                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1253                         csn->bv_len + 1 );
1254                 se->se_next = NULL;
1255                 se->se_tag = op->o_tag;
1256
1257                 se->se_uuid.bv_val = (char *)(se+1);
1258                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1259                 se->se_uuid.bv_len = opc->suuid.bv_len;
1260
1261                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1262                 AC_MEMCPY( se->se_csn.bv_val, csn->bv_val, csn->bv_len );
1263                 se->se_csn.bv_val[csn->bv_len] = '\0';
1264                 se->se_csn.bv_len = csn->bv_len;
1265
1266                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1267                 if ( sl->sl_head ) {
1268                         sl->sl_tail->se_next = se;
1269                 } else {
1270                         sl->sl_head = se;
1271                 }
1272                 sl->sl_tail = se;
1273                 sl->sl_num++;
1274                 while ( sl->sl_num > sl->sl_size ) {
1275                         se = sl->sl_head;
1276                         sl->sl_head = se->se_next;
1277                         strcpy( sl->sl_mincsn.bv_val, se->se_csn.bv_val );
1278                         sl->sl_mincsn.bv_len = se->se_csn.bv_len;
1279                         ch_free( se );
1280                         sl->sl_num--;
1281                         if ( !sl->sl_head ) {
1282                                 sl->sl_tail = NULL;
1283                         }
1284                 }
1285                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1286         }
1287 }
1288
1289 /* Just set a flag if we found the matching entry */
1290 static int
1291 playlog_cb( Operation *op, SlapReply *rs )
1292 {
1293         if ( rs->sr_type == REP_SEARCH ) {
1294                 op->o_callback->sc_private = (void *)1;
1295         }
1296         return rs->sr_err;
1297 }
1298
1299 /* enter with sl->sl_mutex locked, release before returning */
1300 static void
1301 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1302         struct berval *oldcsn, struct berval *ctxcsn )
1303 {
1304         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1305         slog_entry *se;
1306         int i, j, ndel, num, nmods, mmods;
1307         BerVarray uuids;
1308
1309         if ( !sl->sl_num ) {
1310                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1311                 return;
1312         }
1313
1314         num = sl->sl_num;
1315         i = 0;
1316         nmods = 0;
1317
1318         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1319                 num * UUID_LEN, op->o_tmpmemctx );
1320
1321         uuids[0].bv_val = (char *)(uuids + num + 1);
1322
1323         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1324          * and everything else at the end. Do this first so we can
1325          * unlock the list mutex.
1326          */
1327         for ( se=sl->sl_head; se; se=se->se_next ) {
1328                 if ( ber_bvcmp( &se->se_csn, oldcsn ) < 0 ) continue;
1329                 if ( ber_bvcmp( &se->se_csn, ctxcsn ) > 0 ) break;
1330                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1331                         j = i;
1332                         i++;
1333                 } else {
1334                         nmods++;
1335                         j = num - nmods;
1336                 }
1337                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1338                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1339                 uuids[j].bv_len = UUID_LEN;
1340         }
1341         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1342
1343         ndel = i;
1344
1345         /* Zero out unused slots */
1346         for ( i=ndel; i < num - nmods; i++ )
1347                 uuids[i].bv_len = 0;
1348
1349         /* Mods must be validated to see if they belong in this delete set.
1350          */
1351
1352         mmods = nmods;
1353         /* Strip any duplicates */
1354         for ( i=0; i<nmods; i++ ) {
1355                 for ( j=0; j<ndel; j++ ) {
1356                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1357                                 uuids[num - 1 - i].bv_len = 0;
1358                                 mmods --;
1359                                 break;
1360                         }
1361                 }
1362                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1363                 for ( j=0; j<i; j++ ) {
1364                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1365                                 uuids[num - 1 - i].bv_len = 0;
1366                                 mmods --;
1367                                 break;
1368                         }
1369                 }
1370         }
1371
1372         if ( mmods ) {
1373                 Operation fop;
1374                 SlapReply frs = { REP_RESULT };
1375                 int rc;
1376                 Filter mf, af;
1377 #ifdef LDAP_COMP_MATCH
1378                 AttributeAssertion eq = { NULL, BER_BVNULL, NULL };
1379 #else
1380                 AttributeAssertion eq;
1381 #endif
1382                 slap_callback cb = {0};
1383
1384                 fop = *op;
1385
1386                 fop.o_sync_mode = 0;
1387                 fop.o_callback = &cb;
1388                 fop.ors_limit = NULL;
1389                 fop.ors_tlimit = SLAP_NO_LIMIT;
1390                 fop.ors_attrs = slap_anlist_all_attributes;
1391                 fop.ors_attrsonly = 0;
1392                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1393
1394                 af.f_choice = LDAP_FILTER_AND;
1395                 af.f_next = NULL;
1396                 af.f_and = &mf;
1397                 mf.f_choice = LDAP_FILTER_EQUALITY;
1398                 mf.f_ava = &eq;
1399                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1400                 mf.f_next = fop.ors_filter;
1401
1402                 fop.ors_filter = &af;
1403
1404                 cb.sc_response = playlog_cb;
1405                 fop.o_bd->bd_info = on->on_info->oi_orig;
1406
1407                 for ( i=ndel; i<num; i++ ) {
1408                         if ( uuids[i].bv_len == 0 ) continue;
1409
1410                         mf.f_av_value = uuids[i];
1411                         cb.sc_private = NULL;
1412                         fop.ors_slimit = 1;
1413                         rc = fop.o_bd->be_search( &fop, &frs );
1414
1415                         /* If entry was not found, add to delete list */
1416                         if ( !cb.sc_private ) {
1417                                 uuids[ndel++] = uuids[i];
1418                         }
1419                 }
1420                 fop.o_bd->bd_info = (BackendInfo *)on;
1421         }
1422         if ( ndel ) {
1423                 uuids[ndel].bv_val = NULL;
1424                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL, 0, uuids, 1 );
1425         }
1426 }
1427
1428 static int
1429 syncprov_op_response( Operation *op, SlapReply *rs )
1430 {
1431         opcookie *opc = op->o_callback->sc_private;
1432         slap_overinst *on = opc->son;
1433         syncprov_info_t         *si = on->on_bi.bi_private;
1434         syncmatches *sm;
1435
1436         if ( rs->sr_err == LDAP_SUCCESS )
1437         {
1438                 struct berval maxcsn = BER_BVNULL, curcsn = BER_BVNULL;
1439                 char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1440
1441                 /* Update our context CSN */
1442                 cbuf[0] = '\0';
1443                 ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1444                 slap_get_commit_csn( op, &maxcsn, &curcsn );
1445                 if ( !BER_BVISNULL( &maxcsn ) ) {
1446                         strcpy( cbuf, maxcsn.bv_val );
1447                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn ) > 0 ) {
1448                                 strcpy( si->si_ctxcsnbuf, cbuf );
1449                                 si->si_ctxcsn.bv_len = maxcsn.bv_len;
1450                         }
1451                 }
1452
1453                 /* Don't do any processing for consumer contextCSN updates */
1454                 if ( SLAP_SYNC_SHADOW( op->o_bd ) &&
1455                         op->o_msgid == SLAP_SYNC_UPDATE_MSGID ) {
1456                         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1457                         return SLAP_CB_CONTINUE;
1458                 }
1459
1460                 si->si_numops++;
1461                 if ( si->si_chkops || si->si_chktime ) {
1462                         int do_check=0;
1463                         if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1464                                 do_check = 1;
1465                                 si->si_numops = 0;
1466                         }
1467                         if ( si->si_chktime &&
1468                                 (op->o_time - si->si_chklast >= si->si_chktime )) {
1469                                 do_check = 1;
1470                                 si->si_chklast = op->o_time;
1471                         }
1472                         if ( do_check ) {
1473                                 syncprov_checkpoint( op, rs, on );
1474                         }
1475                 }
1476                 ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1477
1478                 opc->sctxcsn.bv_len = maxcsn.bv_len;
1479                 opc->sctxcsn.bv_val = cbuf;
1480
1481                 /* Handle any persistent searches */
1482                 if ( si->si_ops ) {
1483                         switch(op->o_tag) {
1484                         case LDAP_REQ_ADD:
1485                         case LDAP_REQ_MODIFY:
1486                         case LDAP_REQ_MODRDN:
1487                         case LDAP_REQ_EXTENDED:
1488                                 syncprov_matchops( op, opc, 0 );
1489                                 break;
1490                         case LDAP_REQ_DELETE:
1491                                 /* for each match in opc->smatches:
1492                                  *   send DELETE msg
1493                                  */
1494                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1495                                         if ( sm->sm_op->s_op->o_abandon )
1496                                                 continue;
1497                                         syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_DELETE );
1498                                 }
1499                                 break;
1500                         }
1501                 }
1502
1503                 /* Add any log records */
1504                 if ( si->si_logs && op->o_tag != LDAP_REQ_ADD ) {
1505                         syncprov_add_slog( op, &curcsn );
1506                 }
1507
1508         }
1509         return SLAP_CB_CONTINUE;
1510 }
1511
1512 /* We don't use a subentry to store the context CSN any more.
1513  * We expose the current context CSN as an operational attribute
1514  * of the suffix entry.
1515  */
1516 static int
1517 syncprov_op_compare( Operation *op, SlapReply *rs )
1518 {
1519         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1520         syncprov_info_t         *si = on->on_bi.bi_private;
1521         int rc = SLAP_CB_CONTINUE;
1522
1523         if ( dn_match( &op->o_req_ndn, op->o_bd->be_nsuffix ) &&
1524                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1525         {
1526                 Entry e = {0};
1527                 Attribute a = {0};
1528                 struct berval bv[2];
1529
1530                 e.e_name = op->o_bd->be_suffix[0];
1531                 e.e_nname = op->o_bd->be_nsuffix[0];
1532
1533                 BER_BVZERO( &bv[1] );
1534                 bv[0] = si->si_ctxcsn;
1535
1536                 a.a_desc = slap_schema.si_ad_contextCSN;
1537                 a.a_vals = bv;
1538                 a.a_nvals = a.a_vals;
1539
1540                 ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1541
1542                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1543                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1544                 if ( ! rs->sr_err ) {
1545                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1546                         goto return_results;
1547                 }
1548
1549                 if ( get_assert( op ) &&
1550                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
1551                 {
1552                         rs->sr_err = LDAP_ASSERTION_FAILED;
1553                         goto return_results;
1554                 }
1555
1556
1557                 rs->sr_err = LDAP_COMPARE_FALSE;
1558
1559                 if ( value_find_ex( op->oq_compare.rs_ava->aa_desc,
1560                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
1561                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
1562                                 a.a_nvals, &op->oq_compare.rs_ava->aa_value, op->o_tmpmemctx ) == 0 )
1563                 {
1564                         rs->sr_err = LDAP_COMPARE_TRUE;
1565                 }
1566
1567 return_results:;
1568
1569                 ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1570
1571                 send_ldap_result( op, rs );
1572
1573                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
1574                         rs->sr_err = LDAP_SUCCESS;
1575                 }
1576                 rc = rs->sr_err;
1577         }
1578
1579         return rc;
1580 }
1581
1582 static int
1583 syncprov_op_mod( Operation *op, SlapReply *rs )
1584 {
1585         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1586         syncprov_info_t         *si = on->on_bi.bi_private;
1587
1588         slap_callback *cb = op->o_tmpcalloc(1, sizeof(slap_callback)+
1589                 sizeof(opcookie) +
1590                 (si->si_ops ? sizeof(modinst) : 0 ),
1591                 op->o_tmpmemctx);
1592         opcookie *opc = (opcookie *)(cb+1);
1593         opc->son = on;
1594         cb->sc_response = syncprov_op_response;
1595         cb->sc_cleanup = syncprov_op_cleanup;
1596         cb->sc_private = opc;
1597         cb->sc_next = op->o_callback;
1598         op->o_callback = cb;
1599
1600         /* If there are active persistent searches, lock this operation.
1601          * See seqmod.c for the locking logic on its own.
1602          */
1603         if ( si->si_ops ) {
1604                 modtarget *mt, mtdummy;
1605                 modinst *mi;
1606
1607                 mi = (modinst *)(opc+1);
1608                 mi->mi_op = op;
1609
1610                 /* See if we're already modifying this entry... */
1611                 mtdummy.mt_op = op;
1612                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1613                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1614                 if ( mt ) {
1615                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1616                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1617                         mt->mt_tail->mi_next = mi;
1618                         mt->mt_tail = mi;
1619                         /* wait for this op to get to head of list */
1620                         while ( mt->mt_mods != mi ) {
1621                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1622                                 ldap_pvt_thread_yield();
1623                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1624
1625                                 /* clean up if the caller is giving up */
1626                                 if ( op->o_abandon ) {
1627                                         modinst *m2;
1628                                         for ( m2 = mt->mt_mods; m2->mi_next != mi;
1629                                                 m2 = m2->mi_next );
1630                                         m2->mi_next = mi->mi_next;
1631                                         if ( mt->mt_tail == mi ) mt->mt_tail = m2;
1632                                         op->o_tmpfree( cb, op->o_tmpmemctx );
1633                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1634                                         return SLAPD_ABANDON;
1635                                 }
1636                         }
1637                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1638                 } else {
1639                         /* Record that we're modifying this entry now */
1640                         mt = ch_malloc( sizeof(modtarget) );
1641                         mt->mt_mods = mi;
1642                         mt->mt_tail = mi;
1643                         mt->mt_op = mi->mi_op;
1644                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
1645                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
1646                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1647                 }
1648         }
1649
1650         if (( si->si_ops || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
1651                 syncprov_matchops( op, opc, 1 );
1652
1653         return SLAP_CB_CONTINUE;
1654 }
1655
1656 static int
1657 syncprov_op_extended( Operation *op, SlapReply *rs )
1658 {
1659         if ( exop_is_write( op ))
1660                 return syncprov_op_mod( op, rs );
1661
1662         return SLAP_CB_CONTINUE;
1663 }
1664
1665 typedef struct searchstate {
1666         slap_overinst *ss_on;
1667         syncops *ss_so;
1668         int ss_present;
1669         struct berval ss_ctxcsn;
1670         char ss_csnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1671 } searchstate;
1672
1673 static int
1674 syncprov_search_cleanup( Operation *op, SlapReply *rs )
1675 {
1676         if ( rs->sr_ctrls ) {
1677                 op->o_tmpfree( rs->sr_ctrls[0], op->o_tmpmemctx );
1678                 op->o_tmpfree( rs->sr_ctrls, op->o_tmpmemctx );
1679                 rs->sr_ctrls = NULL;
1680         }
1681         return 0;
1682 }
1683
1684 static void
1685 syncprov_detach_op( Operation *op, syncops *so, slap_overinst *on )
1686 {
1687         Operation *op2;
1688         int i, alen = 0;
1689         size_t size;
1690         char *ptr;
1691         GroupAssertion *g1, *g2;
1692
1693         /* count the search attrs */
1694         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1695                 alen += op->ors_attrs[i].an_name.bv_len + 1;
1696         }
1697         /* Make a new copy of the operation */
1698         size = sizeof(Operation) + sizeof(Opheader) +
1699                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
1700                 op->o_req_dn.bv_len + 1 +
1701                 op->o_req_ndn.bv_len + 1 +
1702                 op->o_ndn.bv_len + 1 +
1703                 so->s_filterstr.bv_len + 1;
1704         op2 = (Operation *)ch_calloc( 1, size );
1705         op2->o_hdr = (Opheader *)(op2+1);
1706
1707         /* Copy the fields we care about explicitly, leave the rest alone */
1708         *op2->o_hdr = *op->o_hdr;
1709         op2->o_tag = op->o_tag;
1710         op2->o_time = op->o_time;
1711         op2->o_bd = on->on_info->oi_origdb;
1712         op2->o_request = op->o_request;
1713         op2->o_private = on;
1714
1715         if ( i ) {
1716                 op2->ors_attrs = (AttributeName *)(op2->o_hdr + 1);
1717                 ptr = (char *)(op2->ors_attrs+i+1);
1718                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1719                         op2->ors_attrs[i] = op->ors_attrs[i];
1720                         op2->ors_attrs[i].an_name.bv_val = ptr;
1721                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
1722                 }
1723                 BER_BVZERO( &op2->ors_attrs[i].an_name );
1724         } else {
1725                 ptr = (char *)(op2->o_hdr + 1);
1726         }
1727         op2->o_authz = op->o_authz;
1728         op2->o_ndn.bv_val = ptr;
1729         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
1730         op2->o_dn = op2->o_ndn;
1731         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
1732         op2->o_req_dn.bv_val = ptr;
1733         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
1734         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
1735         op2->o_req_ndn.bv_val = ptr;
1736         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
1737         op2->ors_filterstr.bv_val = ptr;
1738         strcpy( ptr, so->s_filterstr.bv_val );
1739         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
1740         op2->ors_filter = str2filter( ptr );
1741         so->s_op = op2;
1742
1743         /* Copy any cached group ACLs individually */
1744         op2->o_groups = NULL;
1745         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
1746                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
1747                 *g2 = *g1;
1748                 strcpy( g2->ga_ndn, g1->ga_ndn );
1749                 g2->ga_next = op2->o_groups;
1750                 op2->o_groups = g2;
1751         }
1752         /* Don't allow any further group caching */
1753         op2->o_do_not_cache = 1;
1754
1755         /* Add op2 to conn so abandon will find us */
1756         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
1757         op->o_conn->c_n_ops_executing++;
1758         op->o_conn->c_n_ops_completed--;
1759         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
1760         so->s_flags |= PS_IS_DETACHED;
1761         ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
1762 }
1763
1764 static int
1765 syncprov_search_response( Operation *op, SlapReply *rs )
1766 {
1767         searchstate *ss = op->o_callback->sc_private;
1768         slap_overinst *on = ss->ss_on;
1769         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
1770
1771         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
1772                 Attribute *a;
1773                 /* If we got a referral without a referral object, there's
1774                  * something missing that we cannot replicate. Just ignore it.
1775                  * The consumer will abort because we didn't send the expected
1776                  * control.
1777                  */
1778                 if ( !rs->sr_entry ) {
1779                         assert( rs->sr_entry != NULL );
1780                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
1781                         return SLAP_CB_CONTINUE;
1782                 }
1783                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryCSN );
1784                 if ( a ) {
1785                         /* Make sure entry is less than the snaphot'd contextCSN */
1786                         if ( ber_bvcmp( &a->a_nvals[0], &ss->ss_ctxcsn ) > 0 )
1787                                 return LDAP_SUCCESS;
1788
1789                         /* Don't send the ctx entry twice */
1790                         if ( !BER_BVISNULL( &srs->sr_state.ctxcsn ) &&
1791                                 bvmatch( &a->a_nvals[0], &srs->sr_state.ctxcsn ) )
1792                                 return LDAP_SUCCESS;
1793                 }
1794                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1795                         op->o_tmpmemctx );
1796                 rs->sr_ctrls[1] = NULL;
1797                 rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
1798                         LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
1799         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
1800                 struct berval cookie;
1801
1802                 slap_compose_sync_cookie( op, &cookie, &ss->ss_ctxcsn,
1803                         srs->sr_state.rid );
1804
1805                 /* Is this a regular refresh? */
1806                 if ( !ss->ss_so ) {
1807                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1808                                 op->o_tmpmemctx );
1809                         rs->sr_ctrls[1] = NULL;
1810                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
1811                                 0, 1, &cookie, ss->ss_present ?  LDAP_SYNC_REFRESH_PRESENTS :
1812                                         LDAP_SYNC_REFRESH_DELETES );
1813                 } else {
1814                 /* It's RefreshAndPersist, transition to Persist phase */
1815                         syncprov_sendinfo( op, rs, ( ss->ss_present && rs->sr_nentries ) ?
1816                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
1817                                 &cookie, 1, NULL, 0 );
1818
1819                         /* Detach this Op from frontend control */
1820                         ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
1821
1822                         /* Turn off the refreshing flag */
1823                         ss->ss_so->s_flags ^= PS_IS_REFRESHING;
1824
1825                         syncprov_detach_op( op, ss->ss_so, on );
1826                         ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
1827
1828                         return LDAP_SUCCESS;
1829                 }
1830         }
1831
1832         return SLAP_CB_CONTINUE;
1833 }
1834
1835 static int
1836 syncprov_op_search( Operation *op, SlapReply *rs )
1837 {
1838         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1839         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
1840         slap_callback   *cb;
1841         int gotstate = 0, nochange = 0, do_present;
1842         syncops *sop = NULL;
1843         searchstate *ss;
1844         sync_control *srs;
1845         struct berval ctxcsn;
1846         char csnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1847
1848         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
1849
1850         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
1851                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
1852                 return rs->sr_err;
1853         }
1854
1855         do_present = si->si_nopres ? 0 : 1;
1856
1857         srs = op->o_controls[slap_cids.sc_LDAPsync];
1858         op->o_managedsait = SLAP_CONTROL_NONCRITICAL;
1859
1860         /* If this is a persistent search, set it up right away */
1861         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
1862                 syncops so = {0};
1863                 fbase_cookie fc;
1864                 opcookie opc;
1865                 slap_callback sc;
1866
1867                 fc.fss = &so;
1868                 fc.fbase = 0;
1869                 so.s_eid = NOID;
1870                 so.s_op = op;
1871                 so.s_flags = PS_IS_REFRESHING | PS_FIND_BASE;
1872                 /* syncprov_findbase expects to be called as a callback... */
1873                 sc.sc_private = &opc;
1874                 opc.son = on;
1875                 cb = op->o_callback;
1876                 op->o_callback = &sc;
1877                 rs->sr_err = syncprov_findbase( op, &fc );
1878                 op->o_callback = cb;
1879
1880                 if ( rs->sr_err != LDAP_SUCCESS ) {
1881                         send_ldap_result( op, rs );
1882                         return rs->sr_err;
1883                 }
1884                 sop = ch_malloc( sizeof( syncops ));
1885                 *sop = so;
1886                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
1887                 sop->s_rid = srs->sr_state.rid;
1888                 sop->s_inuse = 1;
1889
1890                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1891                 sop->s_next = si->si_ops;
1892                 si->si_ops = sop;
1893                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1894         }
1895
1896         /* snapshot the ctxcsn */
1897         ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1898         strcpy( csnbuf, si->si_ctxcsnbuf );
1899         ctxcsn.bv_len = si->si_ctxcsn.bv_len;
1900         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1901         ctxcsn.bv_val = csnbuf;
1902
1903         /* If we have a cookie, handle the PRESENT lookups */
1904         if ( !BER_BVISNULL( &srs->sr_state.ctxcsn )) {
1905                 sessionlog *sl;
1906
1907                 /* The cookie was validated when it was parsed, just use it */
1908
1909                 /* If just Refreshing and nothing has changed, shortcut it */
1910                 if ( bvmatch( &srs->sr_state.ctxcsn, &ctxcsn )) {
1911                         nochange = 1;
1912                         if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
1913                                 LDAPControl     *ctrls[2];
1914
1915                                 ctrls[0] = NULL;
1916                                 ctrls[1] = NULL;
1917                                 syncprov_done_ctrl( op, rs, ctrls, 0, 0,
1918                                         NULL, LDAP_SYNC_REFRESH_DELETES );
1919                                 rs->sr_ctrls = ctrls;
1920                                 rs->sr_err = LDAP_SUCCESS;
1921                                 send_ldap_result( op, rs );
1922                                 rs->sr_ctrls = NULL;
1923                                 return rs->sr_err;
1924                         }
1925                         goto shortcut;
1926                 }
1927                 /* Do we have a sessionlog for this search? */
1928                 sl=si->si_logs;
1929                 if ( sl ) {
1930                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1931                         if ( ber_bvcmp( &srs->sr_state.ctxcsn, &sl->sl_mincsn ) >= 0 ) {
1932                                 do_present = 0;
1933                                 /* mutex is unlocked in playlog */
1934                                 syncprov_playlog( op, rs, sl, &srs->sr_state.ctxcsn, &ctxcsn );
1935                         } else {
1936                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1937                         }
1938                 }
1939                 /* Is the CSN still present in the database? */
1940                 if ( syncprov_findcsn( op, FIND_CSN ) != LDAP_SUCCESS ) {
1941                         /* No, so a reload is required */
1942 #if 0           /* the consumer doesn't seem to send this hint */
1943                         if ( op->o_sync_rhint == 0 ) {
1944                                 send_ldap_error( op, rs, LDAP_SYNC_REFRESH_REQUIRED, "sync cookie is stale" );
1945                                 return rs->sr_err;
1946                         }
1947 #endif
1948                 } else {
1949                         gotstate = 1;
1950                         /* If changed and doing Present lookup, send Present UUIDs */
1951                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT ) !=
1952                                 LDAP_SUCCESS ) {
1953                                 send_ldap_result( op, rs );
1954                                 return rs->sr_err;
1955                         }
1956                 }
1957         }
1958
1959 shortcut:
1960         /* Append CSN range to search filter, save original filter
1961          * for persistent search evaluation
1962          */
1963         if ( sop ) {
1964                 sop->s_filterstr= op->ors_filterstr;
1965         }
1966
1967         /* If something changed, find the changes */
1968         if ( gotstate && !nochange ) {
1969                 Filter *fand, *fava;
1970
1971                 fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
1972                 fand->f_choice = LDAP_FILTER_AND;
1973                 fand->f_next = NULL;
1974                 fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
1975                 fand->f_and = fava;
1976                 fava->f_choice = LDAP_FILTER_GE;
1977                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
1978                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
1979 #ifdef LDAP_COMP_MATCH
1980                 fava->f_ava->aa_cf = NULL;
1981 #endif
1982                 ber_dupbv_x( &fava->f_ava->aa_value, &srs->sr_state.ctxcsn, op->o_tmpmemctx );
1983                 fava->f_next = op->ors_filter;
1984                 op->ors_filter = fand;
1985                 filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
1986         }
1987
1988         /* Let our callback add needed info to returned entries */
1989         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
1990         ss = (searchstate *)(cb+1);
1991         ss->ss_on = on;
1992         ss->ss_so = sop;
1993         ss->ss_present = do_present;
1994         ss->ss_ctxcsn.bv_len = ctxcsn.bv_len;
1995         ss->ss_ctxcsn.bv_val = ss->ss_csnbuf;
1996         strcpy( ss->ss_ctxcsn.bv_val, ctxcsn.bv_val );
1997         cb->sc_response = syncprov_search_response;
1998         cb->sc_cleanup = syncprov_search_cleanup;
1999         cb->sc_private = ss;
2000         cb->sc_next = op->o_callback;
2001         op->o_callback = cb;
2002
2003 #if 0   /* I don't think we need to shortcircuit back-bdb any more */
2004         op->o_sync_mode &= SLAP_CONTROL_MASK;
2005 #endif
2006
2007         /* If this is a persistent search and no changes were reported during
2008          * the refresh phase, just invoke the response callback to transition
2009          * us into persist phase
2010          */
2011         if ( nochange ) {
2012                 rs->sr_err = LDAP_SUCCESS;
2013                 rs->sr_nentries = 0;
2014                 send_ldap_result( op, rs );
2015                 return rs->sr_err;
2016         }
2017         return SLAP_CB_CONTINUE;
2018 }
2019
2020 static int
2021 syncprov_operational(
2022         Operation *op,
2023         SlapReply *rs )
2024 {
2025         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2026         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2027
2028         if ( rs->sr_entry &&
2029                 dn_match( &rs->sr_entry->e_nname, op->o_bd->be_nsuffix )) {
2030
2031                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
2032                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
2033                         Attribute *a, **ap = NULL;
2034
2035                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
2036                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
2037                                         break;
2038                         }
2039
2040                         if ( !a ) {
2041                                 for ( ap = &rs->sr_operational_attrs; *ap; ap=&(*ap)->a_next );
2042
2043                                 a = ch_malloc( sizeof(Attribute));
2044                                 a->a_desc = slap_schema.si_ad_contextCSN;
2045                                 a->a_vals = ch_malloc( 2 * sizeof(struct berval));
2046                                 a->a_vals[1].bv_val = NULL;
2047                                 a->a_nvals = a->a_vals;
2048                                 a->a_next = NULL;
2049                                 a->a_flags = 0;
2050                                 *ap = a;
2051                         }
2052
2053                         ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
2054                         if ( !ap ) {
2055                                 strcpy( a->a_vals[0].bv_val, si->si_ctxcsnbuf );
2056                         } else {
2057                                 ber_dupbv( &a->a_vals[0], &si->si_ctxcsn );
2058                         }
2059                         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
2060                 }
2061         }
2062         return SLAP_CB_CONTINUE;
2063 }
2064
2065 enum {
2066         SP_CHKPT = 1,
2067         SP_SESSL,
2068         SP_NOPRES
2069 };
2070
2071 static ConfigDriver sp_cf_gen;
2072
2073 static ConfigTable spcfg[] = {
2074         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2075                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2076                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2077                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2078         { "syncprov-sessionlog", "ops", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2079                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2080                         "DESC 'Session log size in ops' "
2081                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2082         { "syncprov-nopresent", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_NOPRES,
2083                 sp_cf_gen, "( OLcfgOvAt:1.3 NAME 'olcSpNoPresent' "
2084                         "DESC 'Omit Present phase processing' "
2085                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2086         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2087 };
2088
2089 static ConfigOCs spocs[] = {
2090         { "( OLcfgOvOc:1.1 "
2091                 "NAME 'olcSyncProvConfig' "
2092                 "DESC 'SyncRepl Provider configuration' "
2093                 "SUP olcOverlayConfig "
2094                 "MAY ( olcSpCheckpoint $ olcSpSessionlog $ olcSpNoPresent ) )",
2095                         Cft_Overlay, spcfg },
2096         { NULL, 0, NULL }
2097 };
2098
2099 static int
2100 sp_cf_gen(ConfigArgs *c)
2101 {
2102         slap_overinst           *on = (slap_overinst *)c->bi;
2103         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2104         int rc = 0;
2105
2106         if ( c->op == SLAP_CONFIG_EMIT ) {
2107                 switch ( c->type ) {
2108                 case SP_CHKPT:
2109                         if ( si->si_chkops || si->si_chktime ) {
2110                                 struct berval bv;
2111                                 bv.bv_len = sprintf( c->msg, "%d %d",
2112                                         si->si_chkops, si->si_chktime );
2113                                 bv.bv_val = c->msg;
2114                                 value_add_one( &c->rvalue_vals, &bv );
2115                         } else {
2116                                 rc = 1;
2117                         }
2118                         break;
2119                 case SP_SESSL:
2120                         if ( si->si_logs ) {
2121                                 c->value_int = si->si_logs->sl_size;
2122                         } else {
2123                                 rc = 1;
2124                         }
2125                         break;
2126                 case SP_NOPRES:
2127                         if ( si->si_nopres ) {
2128                                 c->value_int = 1;
2129                         } else {
2130                                 rc = 1;
2131                         }
2132                         break;
2133                 }
2134                 return rc;
2135         } else if ( c->op == LDAP_MOD_DELETE ) {
2136                 switch ( c->type ) {
2137                 case SP_CHKPT:
2138                         si->si_chkops = 0;
2139                         si->si_chktime = 0;
2140                         break;
2141                 case SP_SESSL:
2142                         if ( si->si_logs )
2143                                 si->si_logs->sl_size = 0;
2144                         else
2145                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2146                         break;
2147                 case SP_NOPRES:
2148                         if ( si->si_nopres )
2149                                 si->si_nopres = 0;
2150                         else
2151                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2152                         break;
2153                 }
2154                 return rc;
2155         }
2156         switch ( c->type ) {
2157         case SP_CHKPT:
2158                 si->si_chkops = atoi( c->argv[1] );
2159                 si->si_chktime = atoi( c->argv[2] ) * 60;
2160                 break;
2161         case SP_SESSL: {
2162                 sessionlog *sl;
2163                 int size = c->value_int;
2164
2165                 if ( size < 0 ) {
2166                         sprintf( c->msg, "%s size %d is negative",
2167                                 c->argv[0], size );
2168                         Debug( LDAP_DEBUG_CONFIG, "%s: %s\n", c->log, c->msg, 0 );
2169                         return ARG_BAD_CONF;
2170                 }
2171                 sl = si->si_logs;
2172                 if ( !sl ) {
2173                         sl = ch_malloc( sizeof( sessionlog ) + LDAP_LUTIL_CSNSTR_BUFSIZE );
2174                         sl->sl_mincsn.bv_val = (char *)(sl+1);
2175                         sl->sl_mincsn.bv_len = 0;
2176                         sl->sl_num = 0;
2177                         sl->sl_head = sl->sl_tail = NULL;
2178                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
2179                         si->si_logs = sl;
2180                 }
2181                 sl->sl_size = size;
2182                 }
2183                 break;
2184         case SP_NOPRES:
2185                 si->si_nopres = c->value_int;
2186                 break;
2187         }
2188         return rc;
2189 }
2190
2191 /* ITS#3456 we cannot run this search on the main thread, must use a
2192  * child thread in order to insure we have a big enough stack.
2193  */
2194 static void *
2195 syncprov_db_otask(
2196         void *ptr
2197 )
2198 {
2199         syncprov_findcsn( ptr, FIND_MAXCSN );
2200         return NULL;
2201 }
2202
2203 /* Read any existing contextCSN from the underlying db.
2204  * Then search for any entries newer than that. If no value exists,
2205  * just generate it. Cache whatever result.
2206  */
2207 static int
2208 syncprov_db_open(
2209     BackendDB *be
2210 )
2211 {
2212         slap_overinst   *on = (slap_overinst *) be->bd_info;
2213         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2214
2215         Connection conn;
2216         char opbuf[OPERATION_BUFFER_SIZE];
2217         char ctxcsnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
2218         Operation *op = (Operation *)opbuf;
2219         Entry *e;
2220         Attribute *a;
2221         int rc;
2222         void *thrctx = NULL;
2223
2224         if ( slapMode & SLAP_TOOL_MODE ) {
2225                 return 0;
2226         }
2227
2228         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
2229         if ( rc ) {
2230                 return rc;
2231         }
2232
2233         thrctx = ldap_pvt_thread_pool_context();
2234         connection_fake_init( &conn, op, thrctx );
2235         op->o_bd = be;
2236         op->o_dn = be->be_rootdn;
2237         op->o_ndn = be->be_rootndn;
2238
2239         ctxcsnbuf[0] = '\0';
2240
2241         op->o_bd->bd_info = on->on_info->oi_orig;
2242         rc = be_entry_get_rw( op, be->be_nsuffix, NULL,
2243                 slap_schema.si_ad_contextCSN, 0, &e );
2244
2245         if ( e ) {
2246                 ldap_pvt_thread_t tid;
2247
2248                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
2249                 if ( a ) {
2250                         si->si_ctxcsn.bv_len = a->a_nvals[0].bv_len;
2251                         if ( si->si_ctxcsn.bv_len >= sizeof(si->si_ctxcsnbuf ))
2252                                 si->si_ctxcsn.bv_len = sizeof(si->si_ctxcsnbuf)-1;
2253                         strncpy( si->si_ctxcsnbuf, a->a_nvals[0].bv_val,
2254                                 si->si_ctxcsn.bv_len );
2255                         si->si_ctxcsnbuf[si->si_ctxcsn.bv_len] = '\0';
2256                         strcpy( ctxcsnbuf, si->si_ctxcsnbuf );
2257                 }
2258                 be_entry_release_rw( op, e, 0 );
2259                 op->o_bd->bd_info = (BackendInfo *)on;
2260                 op->o_req_dn = be->be_suffix[0];
2261                 op->o_req_ndn = be->be_nsuffix[0];
2262                 op->ors_scope = LDAP_SCOPE_SUBTREE;
2263                 ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
2264                 ldap_pvt_thread_join( tid, NULL );
2265         } else if ( SLAP_SYNC_SHADOW( op->o_bd )) {
2266                 /* If we're also a consumer, and we didn't find the context entry,
2267                  * then don't generate anything, wait for our provider to send it
2268                  * to us.
2269                  */
2270                 goto out;
2271         }
2272
2273         if ( BER_BVISEMPTY( &si->si_ctxcsn ) ) {
2274                 slap_get_csn( op, si->si_ctxcsnbuf, sizeof(si->si_ctxcsnbuf),
2275                                 &si->si_ctxcsn, 0 );
2276         }
2277
2278         /* If our ctxcsn is different from what was read from the root
2279          * entry, make sure we do a checkpoint on close
2280          */
2281         if ( strcmp( si->si_ctxcsnbuf, ctxcsnbuf )) {
2282                 si->si_numops++;
2283         }
2284
2285 out:
2286         op->o_bd->bd_info = (BackendInfo *)on;
2287         ldap_pvt_thread_pool_context_reset( thrctx );
2288         return 0;
2289 }
2290
2291 /* Write the current contextCSN into the underlying db.
2292  */
2293 static int
2294 syncprov_db_close(
2295     BackendDB *be
2296 )
2297 {
2298     slap_overinst   *on = (slap_overinst *) be->bd_info;
2299     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2300
2301         if ( slapMode & SLAP_TOOL_MODE ) {
2302                 return 0;
2303         }
2304         if ( si->si_numops ) {
2305                 Connection conn;
2306                 char opbuf[OPERATION_BUFFER_SIZE];
2307                 Operation *op = (Operation *)opbuf;
2308                 SlapReply rs = {REP_RESULT};
2309                 void *thrctx;
2310
2311                 thrctx = ldap_pvt_thread_pool_context();
2312                 connection_fake_init( &conn, op, thrctx );
2313                 op->o_bd = be;
2314                 op->o_dn = be->be_rootdn;
2315                 op->o_ndn = be->be_rootndn;
2316                 syncprov_checkpoint( op, &rs, on );
2317                 ldap_pvt_thread_pool_context_reset( thrctx );
2318         }
2319
2320     return 0;
2321 }
2322
2323 static int
2324 syncprov_db_init(
2325         BackendDB *be
2326 )
2327 {
2328         slap_overinst   *on = (slap_overinst *)be->bd_info;
2329         syncprov_info_t *si;
2330
2331         si = ch_calloc(1, sizeof(syncprov_info_t));
2332         on->on_bi.bi_private = si;
2333         ldap_pvt_thread_mutex_init( &si->si_csn_mutex );
2334         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
2335         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
2336         si->si_ctxcsn.bv_val = si->si_ctxcsnbuf;
2337
2338         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
2339         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
2340         csn_anlist[1].an_desc = slap_schema.si_ad_entryUUID;
2341         csn_anlist[1].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2342
2343         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
2344         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2345
2346         return 0;
2347 }
2348
2349 static int
2350 syncprov_db_destroy(
2351         BackendDB *be
2352 )
2353 {
2354         slap_overinst   *on = (slap_overinst *)be->bd_info;
2355         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2356
2357         if ( si ) {
2358                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
2359                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
2360                 ldap_pvt_thread_mutex_destroy( &si->si_csn_mutex );
2361                 ch_free( si );
2362         }
2363
2364         return 0;
2365 }
2366
2367 static int syncprov_parseCtrl (
2368         Operation *op,
2369         SlapReply *rs,
2370         LDAPControl *ctrl )
2371 {
2372         ber_tag_t tag;
2373         BerElementBuffer berbuf;
2374         BerElement *ber = (BerElement *)&berbuf;
2375         ber_int_t mode;
2376         ber_len_t len;
2377         struct berval cookie = BER_BVNULL;
2378         sync_control *sr;
2379         int rhint = 0;
2380
2381         if ( op->o_sync != SLAP_CONTROL_NONE ) {
2382                 rs->sr_text = "Sync control specified multiple times";
2383                 return LDAP_PROTOCOL_ERROR;
2384         }
2385
2386         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
2387                 rs->sr_text = "Sync control specified with pagedResults control";
2388                 return LDAP_PROTOCOL_ERROR;
2389         }
2390
2391         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
2392                 rs->sr_text = "Sync control value is empty (or absent)";
2393                 return LDAP_PROTOCOL_ERROR;
2394         }
2395
2396         /* Parse the control value
2397          *      syncRequestValue ::= SEQUENCE {
2398          *              mode   ENUMERATED {
2399          *                      -- 0 unused
2400          *                      refreshOnly             (1),
2401          *                      -- 2 reserved
2402          *                      refreshAndPersist       (3)
2403          *              },
2404          *              cookie  syncCookie OPTIONAL
2405          *      }
2406          */
2407
2408         ber_init2( ber, &ctrl->ldctl_value, 0 );
2409
2410         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
2411                 rs->sr_text = "Sync control : mode decoding error";
2412                 return LDAP_PROTOCOL_ERROR;
2413         }
2414
2415         switch( mode ) {
2416         case LDAP_SYNC_REFRESH_ONLY:
2417                 mode = SLAP_SYNC_REFRESH;
2418                 break;
2419         case LDAP_SYNC_REFRESH_AND_PERSIST:
2420                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
2421                 break;
2422         default:
2423                 rs->sr_text = "Sync control : unknown update mode";
2424                 return LDAP_PROTOCOL_ERROR;
2425         }
2426
2427         tag = ber_peek_tag( ber, &len );
2428
2429         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
2430                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
2431                         rs->sr_text = "Sync control : cookie decoding error";
2432                         return LDAP_PROTOCOL_ERROR;
2433                 }
2434         }
2435         if ( tag == LDAP_TAG_RELOAD_HINT ) {
2436                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
2437                         rs->sr_text = "Sync control : rhint decoding error";
2438                         return LDAP_PROTOCOL_ERROR;
2439                 }
2440         }
2441         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
2442                         rs->sr_text = "Sync control : decoding error";
2443                         return LDAP_PROTOCOL_ERROR;
2444         }
2445         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
2446         sr->sr_rhint = rhint;
2447         if (!BER_BVISNULL(&cookie)) {
2448                 ber_dupbv_x( &sr->sr_state.octet_str, &cookie, op->o_tmpmemctx );
2449                 slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx );
2450                 if ( sr->sr_state.rid == -1 ) {
2451                         rs->sr_text = "Sync control : cookie parsing error";
2452                         return LDAP_PROTOCOL_ERROR;
2453                 }
2454         }
2455
2456         op->o_controls[slap_cids.sc_LDAPsync] = sr;
2457
2458         op->o_sync = ctrl->ldctl_iscritical
2459                 ? SLAP_CONTROL_CRITICAL
2460                 : SLAP_CONTROL_NONCRITICAL;
2461
2462         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
2463
2464         return LDAP_SUCCESS;
2465 }
2466
2467 /* This overlay is set up for dynamic loading via moduleload. For static
2468  * configuration, you'll need to arrange for the slap_overinst to be
2469  * initialized and registered by some other function inside slapd.
2470  */
2471
2472 static slap_overinst            syncprov;
2473
2474 int
2475 syncprov_init()
2476 {
2477         int rc;
2478
2479         rc = register_supported_control( LDAP_CONTROL_SYNC,
2480                 SLAP_CTRL_HIDE|SLAP_CTRL_SEARCH, NULL,
2481                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
2482         if ( rc != LDAP_SUCCESS ) {
2483                 Debug( LDAP_DEBUG_ANY,
2484                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
2485                 return rc;
2486         }
2487
2488         syncprov.on_bi.bi_type = "syncprov";
2489         syncprov.on_bi.bi_db_init = syncprov_db_init;
2490         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
2491         syncprov.on_bi.bi_db_open = syncprov_db_open;
2492         syncprov.on_bi.bi_db_close = syncprov_db_close;
2493
2494         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
2495         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
2496
2497         syncprov.on_bi.bi_op_add = syncprov_op_mod;
2498         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
2499         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
2500         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
2501         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
2502         syncprov.on_bi.bi_op_search = syncprov_op_search;
2503         syncprov.on_bi.bi_extended = syncprov_op_extended;
2504         syncprov.on_bi.bi_operational = syncprov_operational;
2505
2506         syncprov.on_bi.bi_cf_ocs = spocs;
2507
2508         rc = config_register_schema( spcfg, spocs );
2509         if ( rc ) return rc;
2510
2511         return overlay_register( &syncprov );
2512 }
2513
2514 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
2515 int
2516 init_module( int argc, char *argv[] )
2517 {
2518         return syncprov_init();
2519 }
2520 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
2521
2522 #endif /* defined(SLAPD_OVER_SYNCPROV) */