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

   1 /* $OpenLDAP$ */
   2 /* syncprov.c - syncrepl provider */
   3 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   4  *
   5  * Copyright 2004-2006 The OpenLDAP Foundation.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted only as authorized by the OpenLDAP
  10  * Public License.
  11  *
  12  * A copy of this license is available in the file LICENSE in the
  13  * top-level directory of the distribution or, alternatively, at
  14  * <http://www.OpenLDAP.org/license.html>.
  15  */
  16 /* ACKNOWLEDGEMENTS:
  17  * This work was initially developed by Howard Chu for inclusion in
  18  * OpenLDAP Software.
  19  */
  20
  21 #include "portable.h"
  22
  23 #ifdef SLAPD_OVER_SYNCPROV
  24
  25 #include <ac/string.h>
  26 #include "lutil.h"
  27 #include "slap.h"
  28 #include "config.h"
  29 #include "ldap_rq.h"
  30
  31 /* A modify request on a particular entry */
  32 typedef struct modinst {
  33         struct modinst *mi_next;
  34         Operation *mi_op;
  35 } modinst;
  36
  37 typedef struct modtarget {
  38         struct modinst *mt_mods;
  39         struct modinst *mt_tail;
  40         Operation *mt_op;
  41         ldap_pvt_thread_mutex_t mt_mutex;
  42 } modtarget;
  43
  44 /* A queued result of a persistent search */
  45 typedef struct syncres {
  46         struct syncres *s_next;
  47         struct berval s_dn;
  48         struct berval s_ndn;
  49         struct berval s_uuid;
  50         struct berval s_csn;
  51         char s_mode;
  52         char s_isreference;
  53 } syncres;
  54
  55 /* Record of a persistent search */
  56 typedef struct syncops {
  57         struct syncops *s_next;
  58         struct berval   s_base;         /* ndn of search base */
  59         ID              s_eid;          /* entryID of search base */
  60         Operation       *s_op;          /* search op */
  61         int             s_rid;
  62         struct berval s_filterstr;
  63         int             s_flags;        /* search status */
  64 #define PS_IS_REFRESHING        0x01
  65 #define PS_IS_DETACHED          0x02
  66 #define PS_WROTE_BASE           0x04
  67 #define PS_FIND_BASE            0x08
  68
  69         int             s_inuse;        /* reference count */
  70         struct syncres *s_res;
  71         struct syncres *s_restail;
  72         struct re_s     *s_qtask;       /* task for playing psearch responses */
  73 #define RUNQ_INTERVAL   36000   /* a long time */
  74         ldap_pvt_thread_mutex_t s_mutex;
  75 } syncops;
  76
  77 /* A received sync control */
  78 typedef struct sync_control {
  79         struct sync_cookie sr_state;
  80         int sr_rhint;
  81 } sync_control;
  82
  83 #if 0 /* moved back to slap.h */
  84 #define o_sync  o_ctrlflag[slap_cids.sc_LDAPsync]
  85 #endif
  86 /* o_sync_mode uses data bits of o_sync */
  87 #define o_sync_mode     o_ctrlflag[slap_cids.sc_LDAPsync]
  88
  89 #define SLAP_SYNC_NONE                                  (LDAP_SYNC_NONE<<SLAP_CONTROL_SHIFT)
  90 #define SLAP_SYNC_REFRESH                               (LDAP_SYNC_REFRESH_ONLY<<SLAP_CONTROL_SHIFT)
  91 #define SLAP_SYNC_PERSIST                               (LDAP_SYNC_RESERVED<<SLAP_CONTROL_SHIFT)
  92 #define SLAP_SYNC_REFRESH_AND_PERSIST   (LDAP_SYNC_REFRESH_AND_PERSIST<<SLAP_CONTROL_SHIFT)
  93
  94 /* Record of which searches matched at premodify step */
  95 typedef struct syncmatches {
  96         struct syncmatches *sm_next;
  97         syncops *sm_op;
  98 } syncmatches;
  99
 100 /* Session log data */
 101 typedef struct slog_entry {
 102         struct slog_entry *se_next;
 103         struct berval se_uuid;
 104         struct berval se_csn;
 105         ber_tag_t       se_tag;
 106 } slog_entry;
 107
 108 typedef struct sessionlog {
 109         struct berval   sl_mincsn;
 110         int             sl_num;
 111         int             sl_size;
 112         slog_entry *sl_head;
 113         slog_entry *sl_tail;
 114         ldap_pvt_thread_mutex_t sl_mutex;
 115 } sessionlog;
 116
 117 /* The main state for this overlay */
 118 typedef struct syncprov_info_t {
 119         syncops         *si_ops;
 120         struct berval   si_ctxcsn;      /* ldapsync context */
 121         int             si_chkops;      /* checkpointing info */
 122         int             si_chktime;
 123         int             si_numops;      /* number of ops since last checkpoint */
 124         int             si_nopres;      /* Skip present phase */
 125         int             si_usehint;     /* use reload hint */
 126         time_t  si_chklast;     /* time of last checkpoint */
 127         Avlnode *si_mods;       /* entries being modified */
 128         sessionlog      *si_logs;
 129         ldap_pvt_thread_mutex_t si_csn_mutex;
 130         ldap_pvt_thread_mutex_t si_ops_mutex;
 131         ldap_pvt_thread_mutex_t si_mods_mutex;
 132         char            si_ctxcsnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 133 } syncprov_info_t;
 134
 135 typedef struct opcookie {
 136         slap_overinst *son;
 137         syncmatches *smatches;
 138         struct berval sdn;      /* DN of entry, for deletes */
 139         struct berval sndn;
 140         struct berval suuid;    /* UUID of entry */
 141         struct berval sctxcsn;
 142         int sreference; /* Is the entry a reference? */
 143 } opcookie;
 144
 145 typedef struct fbase_cookie {
 146         struct berval *fdn;     /* DN of a modified entry, for scope testing */
 147         syncops *fss;   /* persistent search we're testing against */
 148         int fbase;      /* if TRUE we found the search base and it's still valid */
 149         int fscope;     /* if TRUE then fdn is within the psearch scope */
 150 } fbase_cookie;
 151
 152 static AttributeName csn_anlist[3];
 153 static AttributeName uuid_anlist[2];
 154
 155 /* Build a LDAPsync intermediate state control */
 156 static int
 157 syncprov_state_ctrl(
 158         Operation       *op,
 159         SlapReply       *rs,
 160         Entry           *e,
 161         int             entry_sync_state,
 162         LDAPControl     **ctrls,
 163         int             num_ctrls,
 164         int             send_cookie,
 165         struct berval   *cookie )
 166 {
 167         Attribute* a;
 168         int ret;
 169
 170         BerElementBuffer berbuf;
 171         BerElement *ber = (BerElement *)&berbuf;
 172
 173         struct berval   entryuuid_bv = BER_BVNULL;
 174
 175         ber_init2( ber, 0, LBER_USE_DER );
 176         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 177
 178         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 179
 180         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 181                 AttributeDescription *desc = a->a_desc;
 182                 if ( desc == slap_schema.si_ad_entryUUID ) {
 183                         entryuuid_bv = a->a_nvals[0];
 184                         break;
 185                 }
 186         }
 187
 188         /* FIXME: what if entryuuid is NULL or empty ? */
 189
 190         if ( send_cookie && cookie ) {
 191                 ber_printf( ber, "{eOON}",
 192                         entry_sync_state, &entryuuid_bv, cookie );
 193         } else {
 194                 ber_printf( ber, "{eON}",
 195                         entry_sync_state, &entryuuid_bv );
 196         }
 197
 198         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 199         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 200         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 201
 202         ber_free_buf( ber );
 203
 204         if ( ret < 0 ) {
 205                 Debug( LDAP_DEBUG_TRACE,
 206                         "slap_build_sync_ctrl: ber_flatten2 failed\n",
 207                         0, 0, 0 );
 208                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 209                 return ret;
 210         }
 211
 212         return LDAP_SUCCESS;
 213 }
 214
 215 /* Build a LDAPsync final state control */
 216 static int
 217 syncprov_done_ctrl(
 218         Operation       *op,
 219         SlapReply       *rs,
 220         LDAPControl     **ctrls,
 221         int                     num_ctrls,
 222         int                     send_cookie,
 223         struct berval *cookie,
 224         int                     refreshDeletes )
 225 {
 226         int ret;
 227         BerElementBuffer berbuf;
 228         BerElement *ber = (BerElement *)&berbuf;
 229
 230         ber_init2( ber, NULL, LBER_USE_DER );
 231         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 232
 233         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 234
 235         ber_printf( ber, "{" );
 236         if ( send_cookie && cookie ) {
 237                 ber_printf( ber, "O", cookie );
 238         }
 239         if ( refreshDeletes == LDAP_SYNC_REFRESH_DELETES ) {
 240                 ber_printf( ber, "b", refreshDeletes );
 241         }
 242         ber_printf( ber, "N}" );
 243
 244         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_DONE;
 245         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 246         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 247
 248         ber_free_buf( ber );
 249
 250         if ( ret < 0 ) {
 251                 Debug( LDAP_DEBUG_TRACE,
 252                         "syncprov_done_ctrl: ber_flatten2 failed\n",
 253                         0, 0, 0 );
 254                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 255                 return ret;
 256         }
 257
 258         return LDAP_SUCCESS;
 259 }
 260
 261 static int
 262 syncprov_sendinfo(
 263         Operation       *op,
 264         SlapReply       *rs,
 265         int                     type,
 266         struct berval *cookie,
 267         int                     refreshDone,
 268         BerVarray       syncUUIDs,
 269         int                     refreshDeletes )
 270 {
 271         BerElementBuffer berbuf;
 272         BerElement *ber = (BerElement *)&berbuf;
 273         struct berval rspdata;
 274
 275         int ret;
 276
 277         ber_init2( ber, NULL, LBER_USE_DER );
 278         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 279
 280         if ( type ) {
 281                 switch ( type ) {
 282                 case LDAP_TAG_SYNC_NEW_COOKIE:
 283                         ber_printf( ber, "tO", type, cookie );
 284                         break;
 285                 case LDAP_TAG_SYNC_REFRESH_DELETE:
 286                 case LDAP_TAG_SYNC_REFRESH_PRESENT:
 287                         ber_printf( ber, "t{", type );
 288                         if ( cookie ) {
 289                                 ber_printf( ber, "O", cookie );
 290                         }
 291                         if ( refreshDone == 0 ) {
 292                                 ber_printf( ber, "b", refreshDone );
 293                         }
 294                         ber_printf( ber, "N}" );
 295                         break;
 296                 case LDAP_TAG_SYNC_ID_SET:
 297                         ber_printf( ber, "t{", type );
 298                         if ( cookie ) {
 299                                 ber_printf( ber, "O", cookie );
 300                         }
 301                         if ( refreshDeletes == 1 ) {
 302                                 ber_printf( ber, "b", refreshDeletes );
 303                         }
 304                         ber_printf( ber, "[W]", syncUUIDs );
 305                         ber_printf( ber, "N}" );
 306                         break;
 307                 default:
 308                         Debug( LDAP_DEBUG_TRACE,
 309                                 "syncprov_sendinfo: invalid syncinfo type (%d)\n",
 310                                 type, 0, 0 );
 311                         return LDAP_OTHER;
 312                 }
 313         }
 314
 315         ret = ber_flatten2( ber, &rspdata, 0 );
 316
 317         if ( ret < 0 ) {
 318                 Debug( LDAP_DEBUG_TRACE,
 319                         "syncprov_sendinfo: ber_flatten2 failed\n",
 320                         0, 0, 0 );
 321                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 322                 return ret;
 323         }
 324
 325         rs->sr_rspoid = LDAP_SYNC_INFO;
 326         rs->sr_rspdata = &rspdata;
 327         send_ldap_intermediate( op, rs );
 328         rs->sr_rspdata = NULL;
 329         ber_free_buf( ber );
 330
 331         return LDAP_SUCCESS;
 332 }
 333
 334 /* Find a modtarget in an AVL tree */
 335 static int
 336 sp_avl_cmp( const void *c1, const void *c2 )
 337 {
 338         const modtarget *m1, *m2;
 339         int rc;
 340
 341         m1 = c1; m2 = c2;
 342         rc = m1->mt_op->o_req_ndn.bv_len - m2->mt_op->o_req_ndn.bv_len;
 343
 344         if ( rc ) return rc;
 345         return ber_bvcmp( &m1->mt_op->o_req_ndn, &m2->mt_op->o_req_ndn );
 346 }
 347
 348 /* syncprov_findbase:
 349  *   finds the true DN of the base of a search (with alias dereferencing) and
 350  * checks to make sure the base entry doesn't get replaced with a different
 351  * entry (e.g., swapping trees via ModDN, or retargeting an alias). If a
 352  * change is detected, any persistent search on this base must be terminated /
 353  * reloaded.
 354  *   On the first call, we just save the DN and entryID. On subsequent calls
 355  * we compare the DN and entryID with the saved values.
 356  */
 357 static int
 358 findbase_cb( Operation *op, SlapReply *rs )
 359 {
 360         slap_callback *sc = op->o_callback;
 361
 362         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 363                 fbase_cookie *fc = sc->sc_private;
 364
 365                 /* If no entryID, we're looking for the first time.
 366                  * Just store whatever we got.
 367                  */
 368                 if ( fc->fss->s_eid == NOID ) {
 369                         fc->fbase = 2;
 370                         fc->fss->s_eid = rs->sr_entry->e_id;
 371                         ber_dupbv( &fc->fss->s_base, &rs->sr_entry->e_nname );
 372
 373                 } else if ( rs->sr_entry->e_id == fc->fss->s_eid &&
 374                         dn_match( &rs->sr_entry->e_nname, &fc->fss->s_base )) {
 375
 376                 /* OK, the DN is the same and the entryID is the same. */
 377                         fc->fbase = 1;
 378                 }
 379         }
 380         if ( rs->sr_err != LDAP_SUCCESS ) {
 381                 Debug( LDAP_DEBUG_ANY, "findbase failed! %d\n", rs->sr_err,0,0 );
 382         }
 383         return LDAP_SUCCESS;
 384 }
 385
 386 static Filter generic_filter = { LDAP_FILTER_PRESENT, { 0 }, NULL };
 387 static struct berval generic_filterstr = BER_BVC("(objectclass=*)");
 388
 389 static int
 390 syncprov_findbase( Operation *op, fbase_cookie *fc )
 391 {
 392         opcookie *opc = op->o_callback->sc_private;
 393         slap_overinst *on = opc->son;
 394
 395         /* Use basic parameters from syncrepl search, but use
 396          * current op's threadctx / tmpmemctx
 397          */
 398         ldap_pvt_thread_mutex_lock( &fc->fss->s_mutex );
 399         if ( fc->fss->s_flags & PS_FIND_BASE ) {
 400                 slap_callback cb = {0};
 401                 Operation fop;
 402                 SlapReply frs = { REP_RESULT };
 403                 int rc;
 404
 405                 fc->fss->s_flags ^= PS_FIND_BASE;
 406                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 407
 408                 fop = *fc->fss->s_op;
 409
 410                 fop.o_hdr = op->o_hdr;
 411                 fop.o_bd = op->o_bd;
 412                 fop.o_time = op->o_time;
 413                 fop.o_tincr = op->o_tincr;
 414
 415                 cb.sc_response = findbase_cb;
 416                 cb.sc_private = fc;
 417
 418                 fop.o_sync_mode = 0;    /* turn off sync mode */
 419                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 420                 fop.o_callback = &cb;
 421                 fop.o_tag = LDAP_REQ_SEARCH;
 422                 fop.ors_scope = LDAP_SCOPE_BASE;
 423                 fop.ors_limit = NULL;
 424                 fop.ors_slimit = 1;
 425                 fop.ors_tlimit = SLAP_NO_LIMIT;
 426                 fop.ors_attrs = slap_anlist_no_attrs;
 427                 fop.ors_attrsonly = 1;
 428                 fop.ors_filter = &generic_filter;
 429                 fop.ors_filterstr = generic_filterstr;
 430
 431                 fop.o_bd->bd_info = on->on_info->oi_orig;
 432                 rc = fop.o_bd->be_search( &fop, &frs );
 433                 fop.o_bd->bd_info = (BackendInfo *)on;
 434         } else {
 435                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 436                 fc->fbase = 1;
 437         }
 438
 439         /* After the first call, see if the fdn resides in the scope */
 440         if ( fc->fbase == 1 ) {
 441                 switch ( fc->fss->s_op->ors_scope ) {
 442                 case LDAP_SCOPE_BASE:
 443                         fc->fscope = dn_match( fc->fdn, &fc->fss->s_base );
 444                         break;
 445                 case LDAP_SCOPE_ONELEVEL: {
 446                         struct berval pdn;
 447                         dnParent( fc->fdn, &pdn );
 448                         fc->fscope = dn_match( &pdn, &fc->fss->s_base );
 449                         break; }
 450                 case LDAP_SCOPE_SUBTREE:
 451                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base );
 452                         break;
 453                 case LDAP_SCOPE_SUBORDINATE:
 454                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base ) &&
 455                                 !dn_match( fc->fdn, &fc->fss->s_base );
 456                         break;
 457                 }
 458         }
 459
 460         if ( fc->fbase )
 461                 return LDAP_SUCCESS;
 462
 463         /* If entryID has changed, then the base of this search has
 464          * changed. Invalidate the psearch.
 465          */
 466         return LDAP_NO_SUCH_OBJECT;
 467 }
 468
 469 /* syncprov_findcsn:
 470  *   This function has three different purposes, but they all use a search
 471  * that filters on entryCSN so they're combined here.
 472  * 1: at startup time, after a contextCSN has been read from the database,
 473  * we search for all entries with CSN >= contextCSN in case the contextCSN
 474  * was not checkpointed at the previous shutdown.
 475  *
 476  * 2: when the current contextCSN is known and we have a sync cookie, we search
 477  * for one entry with CSN = the cookie CSN. If not found, try <= cookie CSN.
 478  * If an entry is found, the cookie CSN is valid, otherwise it is stale.
 479  *
 480  * 3: during a refresh phase, we search for all entries with CSN <= the cookie
 481  * CSN, and generate Present records for them. We always collect this result
 482  * in SyncID sets, even if there's only one match.
 483  */
 484 typedef enum find_csn_t {
 485         FIND_MAXCSN     = 1,
 486         FIND_CSN        = 2,
 487         FIND_PRESENT    = 3
 488 } find_csn_t;
 489
 490 static int
 491 findmax_cb( Operation *op, SlapReply *rs )
 492 {
 493         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 494                 struct berval *maxcsn = op->o_callback->sc_private;
 495                 Attribute *a = attr_find( rs->sr_entry->e_attrs,
 496                         slap_schema.si_ad_entryCSN );
 497
 498                 if ( a && ber_bvcmp( &a->a_vals[0], maxcsn ) > 0 ) {
 499                         maxcsn->bv_len = a->a_vals[0].bv_len;
 500                         strcpy( maxcsn->bv_val, a->a_vals[0].bv_val );
 501                 }
 502         }
 503         return LDAP_SUCCESS;
 504 }
 505
 506 static int
 507 findcsn_cb( Operation *op, SlapReply *rs )
 508 {
 509         slap_callback *sc = op->o_callback;
 510
 511         /* We just want to know that at least one exists, so it's OK if
 512          * we exceed the unchecked limit.
 513          */
 514         if ( rs->sr_err == LDAP_ADMINLIMIT_EXCEEDED ||
 515                 (rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS )) {
 516                 sc->sc_private = (void *)1;
 517         }
 518         return LDAP_SUCCESS;
 519 }
 520
 521 /* Build a list of entryUUIDs for sending in a SyncID set */
 522
 523 #define UUID_LEN        16
 524
 525 typedef struct fpres_cookie {
 526         int num;
 527         BerVarray uuids;
 528         char *last;
 529 } fpres_cookie;
 530
 531 static int
 532 findpres_cb( Operation *op, SlapReply *rs )
 533 {
 534         slap_callback *sc = op->o_callback;
 535         fpres_cookie *pc = sc->sc_private;
 536         Attribute *a;
 537         int ret = SLAP_CB_CONTINUE;
 538
 539         switch ( rs->sr_type ) {
 540         case REP_SEARCH:
 541                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryUUID );
 542                 if ( a ) {
 543                         pc->uuids[pc->num].bv_val = pc->last;
 544                         AC_MEMCPY( pc->uuids[pc->num].bv_val, a->a_nvals[0].bv_val,
 545                                 pc->uuids[pc->num].bv_len );
 546                         pc->num++;
 547                         pc->last = pc->uuids[pc->num].bv_val;
 548                         pc->uuids[pc->num].bv_val = NULL;
 549                 }
 550                 ret = LDAP_SUCCESS;
 551                 if ( pc->num != SLAP_SYNCUUID_SET_SIZE )
 552                         break;
 553                 /* FALLTHRU */
 554         case REP_RESULT:
 555                 ret = rs->sr_err;
 556                 if ( pc->num ) {
 557                         ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 558                                 0, pc->uuids, 0 );
 559                         pc->uuids[pc->num].bv_val = pc->last;
 560                         pc->num = 0;
 561                         pc->last = pc->uuids[0].bv_val;
 562                 }
 563                 break;
 564         default:
 565                 break;
 566         }
 567         return ret;
 568 }
 569
 570 static int
 571 syncprov_findcsn( Operation *op, find_csn_t mode )
 572 {
 573         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 574         syncprov_info_t         *si = on->on_bi.bi_private;
 575
 576         slap_callback cb = {0};
 577         Operation fop;
 578         SlapReply frs = { REP_RESULT };
 579         char buf[LDAP_LUTIL_CSNSTR_BUFSIZE + STRLENOF("(entryCSN<=)")];
 580         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 581         struct berval maxcsn;
 582         Filter cf, af;
 583 #ifdef LDAP_COMP_MATCH
 584         AttributeAssertion eq = { NULL, BER_BVNULL, NULL };
 585 #else
 586         AttributeAssertion eq = { NULL, BER_BVNULL };
 587 #endif
 588         fpres_cookie pcookie;
 589         sync_control *srs = NULL;
 590         struct slap_limits_set fc_limits;
 591         int i, rc = LDAP_SUCCESS, findcsn_retry = 1;
 592
 593         if ( mode != FIND_MAXCSN ) {
 594                 srs = op->o_controls[slap_cids.sc_LDAPsync];
 595
 596                 if ( srs->sr_state.ctxcsn.bv_len >= LDAP_LUTIL_CSNSTR_BUFSIZE ) {
 597                         return LDAP_OTHER;
 598                 }
 599         }
 600
 601         fop = *op;
 602         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync_mode */
 603         /* We want pure entries, not referrals */
 604         fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 605
 606         cf.f_ava = &eq;
 607         cf.f_av_desc = slap_schema.si_ad_entryCSN;
 608         cf.f_next = NULL;
 609
 610         fop.o_callback = &cb;
 611         fop.ors_limit = NULL;
 612         fop.ors_tlimit = SLAP_NO_LIMIT;
 613         fop.ors_filter = &cf;
 614         fop.ors_filterstr.bv_val = buf;
 615
 616 again:
 617         switch( mode ) {
 618         case FIND_MAXCSN:
 619                 cf.f_choice = LDAP_FILTER_GE;
 620                 cf.f_av_value = si->si_ctxcsn;
 621                 fop.ors_filterstr.bv_len = sprintf( buf, "(entryCSN>=%s)",
 622                         cf.f_av_value.bv_val );
 623                 fop.ors_attrsonly = 0;
 624                 fop.ors_attrs = csn_anlist;
 625                 fop.ors_slimit = SLAP_NO_LIMIT;
 626                 cb.sc_private = &maxcsn;
 627                 cb.sc_response = findmax_cb;
 628                 strcpy( cbuf, si->si_ctxcsn.bv_val );
 629                 maxcsn.bv_val = cbuf;
 630                 maxcsn.bv_len = si->si_ctxcsn.bv_len;
 631                 break;
 632         case FIND_CSN:
 633                 cf.f_av_value = srs->sr_state.ctxcsn;
 634                 /* Look for exact match the first time */
 635                 if ( findcsn_retry ) {
 636                         cf.f_choice = LDAP_FILTER_EQUALITY;
 637                         fop.ors_filterstr.bv_len = sprintf( buf, "(entryCSN=%s)",
 638                                 cf.f_av_value.bv_val );
 639                 /* On retry, look for <= */
 640                 } else {
 641                         cf.f_choice = LDAP_FILTER_LE;
 642                         fop.ors_limit = &fc_limits;
 643                         fc_limits.lms_s_unchecked = 1;
 644                         fop.ors_filterstr.bv_len = sprintf( buf, "(entryCSN<=%s)",
 645                                 cf.f_av_value.bv_val );
 646                 }
 647                 fop.ors_attrsonly = 1;
 648                 fop.ors_attrs = slap_anlist_no_attrs;
 649                 fop.ors_slimit = 1;
 650                 cb.sc_private = NULL;
 651                 cb.sc_response = findcsn_cb;
 652                 break;
 653         case FIND_PRESENT:
 654                 af.f_choice = LDAP_FILTER_AND;
 655                 af.f_next = NULL;
 656                 af.f_and = &cf;
 657                 cf.f_choice = LDAP_FILTER_LE;
 658                 cf.f_av_value = srs->sr_state.ctxcsn;
 659                 cf.f_next = op->ors_filter;
 660                 fop.ors_filter = &af;
 661                 filter2bv_x( &fop, fop.ors_filter, &fop.ors_filterstr );
 662                 fop.ors_attrsonly = 0;
 663                 fop.ors_attrs = uuid_anlist;
 664                 fop.ors_slimit = SLAP_NO_LIMIT;
 665                 cb.sc_private = &pcookie;
 666                 cb.sc_response = findpres_cb;
 667                 pcookie.num = 0;
 668
 669                 /* preallocate storage for a full set */
 670                 pcookie.uuids = op->o_tmpalloc( (SLAP_SYNCUUID_SET_SIZE+1) *
 671                         sizeof(struct berval) + SLAP_SYNCUUID_SET_SIZE * UUID_LEN,
 672                         op->o_tmpmemctx );
 673                 pcookie.last = (char *)(pcookie.uuids + SLAP_SYNCUUID_SET_SIZE+1);
 674                 pcookie.uuids[0].bv_val = pcookie.last;
 675                 pcookie.uuids[0].bv_len = UUID_LEN;
 676                 for (i=1; i<SLAP_SYNCUUID_SET_SIZE; i++) {
 677                         pcookie.uuids[i].bv_val = pcookie.uuids[i-1].bv_val + UUID_LEN;
 678                         pcookie.uuids[i].bv_len = UUID_LEN;
 679                 }
 680                 break;
 681         }
 682
 683         fop.o_bd->bd_info = on->on_info->oi_orig;
 684         fop.o_bd->be_search( &fop, &frs );
 685         fop.o_bd->bd_info = (BackendInfo *)on;
 686
 687         switch( mode ) {
 688         case FIND_MAXCSN:
 689                 strcpy( si->si_ctxcsnbuf, maxcsn.bv_val );
 690                 si->si_ctxcsn.bv_len = maxcsn.bv_len;
 691                 break;
 692         case FIND_CSN:
 693                 /* If matching CSN was not found, invalidate the context. */
 694                 if ( !cb.sc_private ) {
 695                         /* If we didn't find an exact match, then try for <= */
 696                         if ( findcsn_retry ) {
 697                                 findcsn_retry = 0;
 698                                 goto again;
 699                         }
 700                         rc = LDAP_NO_SUCH_OBJECT;
 701                 }
 702                 break;
 703         case FIND_PRESENT:
 704                 op->o_tmpfree( pcookie.uuids, op->o_tmpmemctx );
 705                 op->o_tmpfree( fop.ors_filterstr.bv_val, op->o_tmpmemctx );
 706                 break;
 707         }
 708
 709         return rc;
 710 }
 711
 712 static void
 713 syncprov_free_syncop( syncops *so )
 714 {
 715         syncres *sr, *srnext;
 716         GroupAssertion *ga, *gnext;
 717
 718         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 719         if ( --so->s_inuse > 0 ) {
 720                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 721                 return;
 722         }
 723         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 724         if ( so->s_flags & PS_IS_DETACHED ) {
 725                 filter_free( so->s_op->ors_filter );
 726                 for ( ga = so->s_op->o_groups; ga; ga=gnext ) {
 727                         gnext = ga->ga_next;
 728                         ch_free( ga );
 729                 }
 730                 ch_free( so->s_op );
 731         }
 732         ch_free( so->s_base.bv_val );
 733         for ( sr=so->s_res; sr; sr=srnext ) {
 734                 srnext = sr->s_next;
 735                 ch_free( sr );
 736         }
 737         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 738         ch_free( so );
 739 }
 740
 741 /* Send a persistent search response */
 742 static int
 743 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so,
 744         Entry **e, int mode )
 745 {
 746         slap_overinst *on = opc->son;
 747
 748         SlapReply rs = { REP_SEARCH };
 749         LDAPControl *ctrls[2];
 750         struct berval cookie;
 751         Entry e_uuid = {0};
 752         Attribute a_uuid = {0};
 753
 754         if ( so->s_op->o_abandon )
 755                 return SLAPD_ABANDON;
 756
 757         ctrls[1] = NULL;
 758         slap_compose_sync_cookie( op, &cookie, &opc->sctxcsn, so->s_rid );
 759
 760         e_uuid.e_attrs = &a_uuid;
 761         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 762         a_uuid.a_nvals = &opc->suuid;
 763         rs.sr_err = syncprov_state_ctrl( op, &rs, &e_uuid,
 764                 mode, ctrls, 0, 1, &cookie );
 765         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
 766
 767         rs.sr_ctrls = ctrls;
 768         op->o_bd->bd_info = (BackendInfo *)on->on_info;
 769         switch( mode ) {
 770         case LDAP_SYNC_ADD:
 771                 rs.sr_entry = *e;
 772                 if ( rs.sr_entry->e_private )
 773                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 774                 if ( opc->sreference ) {
 775                         rs.sr_ref = get_entry_referrals( op, rs.sr_entry );
 776                         send_search_reference( op, &rs );
 777                         ber_bvarray_free( rs.sr_ref );
 778                         if ( !rs.sr_entry )
 779                                 *e = NULL;
 780                         break;
 781                 }
 782                 /* fallthru */
 783         case LDAP_SYNC_MODIFY:
 784                 rs.sr_entry = *e;
 785                 if ( rs.sr_entry->e_private )
 786                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 787                 rs.sr_attrs = op->ors_attrs;
 788                 send_search_entry( op, &rs );
 789                 if ( !rs.sr_entry )
 790                         *e = NULL;
 791                 break;
 792         case LDAP_SYNC_DELETE:
 793                 e_uuid.e_attrs = NULL;
 794                 e_uuid.e_name = opc->sdn;
 795                 e_uuid.e_nname = opc->sndn;
 796                 rs.sr_entry = &e_uuid;
 797                 if ( opc->sreference ) {
 798                         struct berval bv = BER_BVNULL;
 799                         rs.sr_ref = &bv;
 800                         send_search_reference( op, &rs );
 801                 } else {
 802                         send_search_entry( op, &rs );
 803                 }
 804                 break;
 805         default:
 806                 assert(0);
 807         }
 808         /* In case someone else freed it already? */
 809         if ( rs.sr_ctrls ) {
 810                 op->o_tmpfree( rs.sr_ctrls[0], op->o_tmpmemctx );
 811                 rs.sr_ctrls = NULL;
 812         }
 813
 814         return rs.sr_err;
 815 }
 816
 817 /* Play back queued responses */
 818 static int
 819 syncprov_qplay( Operation *op, slap_overinst *on, syncops *so )
 820 {
 821         syncres *sr;
 822         Entry *e;
 823         opcookie opc;
 824         int rc = 0;
 825
 826         opc.son = on;
 827         op->o_bd->bd_info = (BackendInfo *)on->on_info;
 828
 829         for (;;) {
 830                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 831                 sr = so->s_res;
 832                 if ( sr )
 833                         so->s_res = sr->s_next;
 834                 if ( !so->s_res )
 835                         so->s_restail = NULL;
 836                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 837
 838                 if ( !sr || so->s_op->o_abandon )
 839                         break;
 840
 841                 opc.sdn = sr->s_dn;
 842                 opc.sndn = sr->s_ndn;
 843                 opc.suuid = sr->s_uuid;
 844                 opc.sctxcsn = sr->s_csn;
 845                 opc.sreference = sr->s_isreference;
 846                 e = NULL;
 847
 848                 if ( sr->s_mode != LDAP_SYNC_DELETE ) {
 849                         rc = be_entry_get_rw( op, &opc.sndn, NULL, NULL, 0, &e );
 850                         if ( rc ) {
 851                                 ch_free( sr );
 852                                 continue;
 853                         }
 854                 }
 855                 rc = syncprov_sendresp( op, &opc, so, &e, sr->s_mode );
 856
 857                 if ( e ) {
 858                         be_entry_release_rw( op, e, 0 );
 859                 }
 860
 861                 ch_free( sr );
 862
 863                 if ( rc )
 864                         break;
 865         }
 866         op->o_bd->bd_info = (BackendInfo *)on;
 867         return rc;
 868 }
 869
 870 /* runqueue task for playing back queued responses */
 871 static void *
 872 syncprov_qtask( void *ctx, void *arg )
 873 {
 874         struct re_s *rtask = arg;
 875         syncops *so = rtask->arg;
 876         slap_overinst *on = so->s_op->o_private;
 877         OperationBuffer opbuf;
 878         Operation *op;
 879         BackendDB be;
 880
 881         op = (Operation *) &opbuf;
 882         *op = *so->s_op;
 883         op->o_hdr = (Opheader *)(op+1);
 884         op->o_controls = (void **)(op->o_hdr+1);
 885         memset( op->o_controls, 0, SLAP_MAX_CIDS * sizeof(void *));
 886
 887         *op->o_hdr = *so->s_op->o_hdr;
 888
 889         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx);
 890         op->o_tmpmfuncs = &slap_sl_mfuncs;
 891         op->o_threadctx = ctx;
 892
 893         /* syncprov_qplay expects a fake db */
 894         be = *so->s_op->o_bd;
 895         be.be_flags |= SLAP_DBFLAG_OVERLAY;
 896         op->o_bd = &be;
 897         op->o_private = NULL;
 898         op->o_callback = NULL;
 899
 900         (void)syncprov_qplay( op, on, so );
 901
 902         /* decrement use count... */
 903         syncprov_free_syncop( so );
 904
 905         /* wait until we get explicitly scheduled again */
 906         ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
 907         ldap_pvt_runqueue_stoptask( &slapd_rq, so->s_qtask );
 908         ldap_pvt_runqueue_resched( &slapd_rq, so->s_qtask, 1 );
 909         ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
 910
 911         return NULL;
 912 }
 913
 914 /* Queue a persistent search response */
 915 static int
 916 syncprov_qresp( opcookie *opc, syncops *so, int mode )
 917 {
 918         syncres *sr;
 919
 920         sr = ch_malloc(sizeof(syncres) + opc->suuid.bv_len + 1 +
 921                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1 + opc->sctxcsn.bv_len + 1 );
 922         sr->s_next = NULL;
 923         sr->s_dn.bv_val = (char *)(sr + 1);
 924         sr->s_dn.bv_len = opc->sdn.bv_len;
 925         sr->s_mode = mode;
 926         sr->s_isreference = opc->sreference;
 927         sr->s_ndn.bv_val = lutil_strcopy( sr->s_dn.bv_val,
 928                  opc->sdn.bv_val ) + 1;
 929         sr->s_ndn.bv_len = opc->sndn.bv_len;
 930         sr->s_uuid.bv_val = lutil_strcopy( sr->s_ndn.bv_val,
 931                  opc->sndn.bv_val ) + 1;
 932         sr->s_uuid.bv_len = opc->suuid.bv_len;
 933         AC_MEMCPY( sr->s_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
 934         sr->s_csn.bv_val = sr->s_uuid.bv_val + sr->s_uuid.bv_len + 1;
 935         sr->s_csn.bv_len = opc->sctxcsn.bv_len;
 936         strcpy( sr->s_csn.bv_val, opc->sctxcsn.bv_val );
 937
 938         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 939         if ( !so->s_res ) {
 940                 so->s_res = sr;
 941         } else {
 942                 so->s_restail->s_next = sr;
 943         }
 944         so->s_restail = sr;
 945
 946         /* If the base of the psearch was modified, check it next time round */
 947         if ( so->s_flags & PS_WROTE_BASE ) {
 948                 so->s_flags ^= PS_WROTE_BASE;
 949                 so->s_flags |= PS_FIND_BASE;
 950         }
 951         if ( so->s_flags & PS_IS_DETACHED ) {
 952                 int wake=0;
 953                 ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
 954                 if ( !so->s_qtask ) {
 955                         so->s_qtask = ldap_pvt_runqueue_insert( &slapd_rq, RUNQ_INTERVAL,
 956                                 syncprov_qtask, so, "syncprov_qtask",
 957                                 so->s_op->o_conn->c_peer_name.bv_val );
 958                         ++so->s_inuse;
 959                         wake = 1;
 960                 } else {
 961                         if (!ldap_pvt_runqueue_isrunning( &slapd_rq, so->s_qtask ) &&
 962                                 !so->s_qtask->next_sched.tv_sec ) {
 963                                 so->s_qtask->interval.tv_sec = 0;
 964                                 ldap_pvt_runqueue_resched( &slapd_rq, so->s_qtask, 0 );
 965                                 so->s_qtask->interval.tv_sec = RUNQ_INTERVAL;
 966                                 ++so->s_inuse;
 967                                 wake = 1;
 968                         }
 969                 }
 970                 ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
 971                 if ( wake )
 972                         slap_wake_listener();
 973         }
 974         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 975         return LDAP_SUCCESS;
 976 }
 977
 978 static int
 979 syncprov_drop_psearch( syncops *so, int lock )
 980 {
 981         if ( so->s_flags & PS_IS_DETACHED ) {
 982                 if ( lock )
 983                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
 984                 so->s_op->o_conn->c_n_ops_executing--;
 985                 so->s_op->o_conn->c_n_ops_completed++;
 986                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, slap_op,
 987                         o_next );
 988                 if ( lock )
 989                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
 990         }
 991         syncprov_free_syncop( so );
 992
 993         return 0;
 994 }
 995
 996 static int
 997 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
 998 {
 999         slap_callback *sc = op->o_callback;
1000         op->o_callback = sc->sc_next;
1001         syncprov_drop_psearch( op->o_callback->sc_private, 0 );
1002         op->o_tmpfree( sc, op->o_tmpmemctx );
1003         return 0;
1004 }
1005
1006 static int
1007 syncprov_op_abandon( Operation *op, SlapReply *rs )
1008 {
1009         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1010         syncprov_info_t         *si = on->on_bi.bi_private;
1011         syncops *so, *soprev;
1012
1013         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1014         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
1015                 soprev=so, so=so->s_next ) {
1016                 if ( so->s_op->o_connid == op->o_connid &&
1017                         so->s_op->o_msgid == op->orn_msgid ) {
1018                                 so->s_op->o_abandon = 1;
1019                                 soprev->s_next = so->s_next;
1020                                 break;
1021                 }
1022         }
1023         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1024         if ( so ) {
1025                 /* Is this really a Cancel exop? */
1026                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
1027                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
1028                         rs->sr_err = LDAP_CANCELLED;
1029                         send_ldap_result( so->s_op, rs );
1030                         if ( so->s_flags & PS_IS_DETACHED ) {
1031                                 slap_callback *cb;
1032                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
1033                                 cb->sc_cleanup = syncprov_ab_cleanup;
1034                                 cb->sc_next = op->o_callback;
1035                                 cb->sc_private = so;
1036                                 return SLAP_CB_CONTINUE;
1037                         }
1038                 }
1039                 syncprov_drop_psearch( so, 0 );
1040         }
1041         return SLAP_CB_CONTINUE;
1042 }
1043
1044 /* Find which persistent searches are affected by this operation */
1045 static void
1046 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
1047 {
1048         slap_overinst *on = opc->son;
1049         syncprov_info_t         *si = on->on_bi.bi_private;
1050
1051         fbase_cookie fc;
1052         syncops *ss, *sprev, *snext;
1053         Entry *e;
1054         Attribute *a;
1055         int rc;
1056         struct berval newdn;
1057         int freefdn = 0;
1058         BackendDB *b0 = op->o_bd, db;
1059
1060         fc.fdn = &op->o_req_ndn;
1061         /* compute new DN */
1062         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1063                 struct berval pdn;
1064                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
1065                 else dnParent( fc.fdn, &pdn );
1066                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
1067                 fc.fdn = &newdn;
1068                 freefdn = 1;
1069         }
1070         if ( op->o_tag != LDAP_REQ_ADD ) {
1071                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1072                         db = *op->o_bd;
1073                         op->o_bd = &db;
1074                 }
1075                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
1076                 rc = be_entry_get_rw( op, fc.fdn, NULL, NULL, 0, &e );
1077                 /* If we're sending responses now, make a copy and unlock the DB */
1078                 if ( e && !saveit ) {
1079                         Entry *e2 = entry_dup( e );
1080                         be_entry_release_rw( op, e, 0 );
1081                         e = e2;
1082                 }
1083                 op->o_bd->bd_info = (BackendInfo *)on;
1084                 if ( rc ) {
1085                         op->o_bd = b0;
1086                         return;
1087                 }
1088         } else {
1089                 e = op->ora_e;
1090         }
1091
1092         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1093                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1094                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1095                 opc->sreference = is_entry_referral( e );
1096                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1097                 if ( a )
1098                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1099         } else if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1100                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1101                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1102                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1103                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1104         }
1105
1106         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1107         for (ss = si->si_ops, sprev = (syncops *)&si->si_ops; ss;
1108                 sprev = ss, ss=snext)
1109         {
1110                 syncmatches *sm;
1111                 int found = 0;
1112
1113                 snext = ss->s_next;
1114                 /* validate base */
1115                 fc.fss = ss;
1116                 fc.fbase = 0;
1117                 fc.fscope = 0;
1118
1119                 /* If the base of the search is missing, signal a refresh */
1120                 rc = syncprov_findbase( op, &fc );
1121                 if ( rc != LDAP_SUCCESS ) {
1122                         SlapReply rs = {REP_RESULT};
1123                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1124                                 "search base has changed" );
1125                         sprev->s_next = snext;
1126                         syncprov_drop_psearch( ss, 1 );
1127                         ss = sprev;
1128                         continue;
1129                 }
1130
1131
1132                 /* If we're sending results now, look for this op in old matches */
1133                 if ( !saveit ) {
1134                         syncmatches *old;
1135
1136                         /* Did we modify the search base? */
1137                         if ( dn_match( &op->o_req_ndn, &ss->s_base )) {
1138                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1139                                 ss->s_flags |= PS_WROTE_BASE;
1140                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1141                         }
1142
1143                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1144                                 old=sm, sm=sm->sm_next ) {
1145                                 if ( sm->sm_op == ss ) {
1146                                         found = 1;
1147                                         old->sm_next = sm->sm_next;
1148                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1149                                         break;
1150                                 }
1151                         }
1152                 }
1153
1154                 /* check if current o_req_dn is in scope and matches filter */
1155                 if ( fc.fscope && test_filter( op, e, ss->s_op->ors_filter ) ==
1156                         LDAP_COMPARE_TRUE ) {
1157                         if ( saveit ) {
1158                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1159                                 sm->sm_next = opc->smatches;
1160                                 sm->sm_op = ss;
1161                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1162                                 ++ss->s_inuse;
1163                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1164                                 opc->smatches = sm;
1165                         } else {
1166                                 /* if found send UPDATE else send ADD */
1167                                 syncprov_qresp( opc, ss,
1168                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD );
1169                         }
1170                 } else if ( !saveit && found ) {
1171                         /* send DELETE */
1172                         syncprov_qresp( opc, ss, LDAP_SYNC_DELETE );
1173                 }
1174         }
1175         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1176
1177         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1178                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
1179                 be_entry_release_rw( op, e, 0 );
1180                 op->o_bd->bd_info = (BackendInfo *)on;
1181         }
1182         if ( freefdn ) {
1183                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1184         }
1185         op->o_bd = b0;
1186 }
1187
1188 static int
1189 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1190 {
1191         slap_callback *cb = op->o_callback;
1192         opcookie *opc = cb->sc_private;
1193         slap_overinst *on = opc->son;
1194         syncprov_info_t         *si = on->on_bi.bi_private;
1195         syncmatches *sm, *snext;
1196         modtarget *mt, mtdummy;
1197
1198         for (sm = opc->smatches; sm; sm=snext) {
1199                 snext = sm->sm_next;
1200                 syncprov_free_syncop( sm->sm_op );
1201                 op->o_tmpfree( sm, op->o_tmpmemctx );
1202         }
1203
1204         /* Remove op from lock table */
1205         mtdummy.mt_op = op;
1206         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1207         mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1208         if ( mt ) {
1209                 modinst *mi = mt->mt_mods;
1210
1211                 /* If there are more, promote the next one */
1212                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1213                 if ( mi->mi_next ) {
1214                         mt->mt_mods = mi->mi_next;
1215                         mt->mt_op = mt->mt_mods->mi_op;
1216                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1217                 } else {
1218                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1219                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1220                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1221                         ch_free( mt );
1222                 }
1223         }
1224         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1225         if ( !BER_BVISNULL( &opc->suuid ))
1226                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1227         if ( !BER_BVISNULL( &opc->sndn ))
1228                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1229         if ( !BER_BVISNULL( &opc->sdn ))
1230                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1231         op->o_callback = cb->sc_next;
1232         op->o_tmpfree(cb, op->o_tmpmemctx);
1233
1234         return 0;
1235 }
1236
1237 static void
1238 syncprov_checkpoint( Operation *op, SlapReply *rs, slap_overinst *on )
1239 {
1240         syncprov_info_t         *si = on->on_bi.bi_private;
1241         Modifications mod;
1242         Operation opm;
1243         SlapReply rsm = { 0 };
1244         struct berval bv[2];
1245         slap_callback cb = {0};
1246
1247         /* If ctxcsn is empty, delete it */
1248         if ( BER_BVISEMPTY( &si->si_ctxcsn )) {
1249                 mod.sml_values = NULL;
1250         } else {
1251                 mod.sml_values = bv;
1252                 bv[1].bv_val = NULL;
1253                 bv[0] = si->si_ctxcsn;
1254         }
1255         mod.sml_nvalues = NULL;
1256         mod.sml_desc = slap_schema.si_ad_contextCSN;
1257         mod.sml_op = LDAP_MOD_REPLACE;
1258         mod.sml_flags = 0;
1259         mod.sml_next = NULL;
1260
1261         cb.sc_response = slap_null_cb;
1262         opm = *op;
1263         opm.o_tag = LDAP_REQ_MODIFY;
1264         opm.o_callback = &cb;
1265         opm.orm_modlist = &mod;
1266         opm.o_req_dn = op->o_bd->be_suffix[0];
1267         opm.o_req_ndn = op->o_bd->be_nsuffix[0];
1268         opm.o_bd->bd_info = on->on_info->oi_orig;
1269         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1270         SLAP_DBFLAGS( opm.o_bd ) |= SLAP_DBFLAG_NOLASTMOD;
1271         opm.o_bd->be_modify( &opm, &rsm );
1272         SLAP_DBFLAGS( opm.o_bd ) ^= SLAP_DBFLAG_NOLASTMOD;
1273         if ( mod.sml_next != NULL ) {
1274                 slap_mods_free( mod.sml_next, 1 );
1275         }
1276 }
1277
1278 static void
1279 syncprov_add_slog( Operation *op )
1280 {
1281         opcookie *opc = op->o_callback->sc_private;
1282         slap_overinst *on = opc->son;
1283         syncprov_info_t         *si = on->on_bi.bi_private;
1284         sessionlog *sl;
1285         slog_entry *se;
1286
1287         sl = si->si_logs;
1288         {
1289                 /* Allocate a record. UUIDs are not NUL-terminated. */
1290                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1291                         op->o_csn.bv_len + 1 );
1292                 se->se_next = NULL;
1293                 se->se_tag = op->o_tag;
1294
1295                 se->se_uuid.bv_val = (char *)(&se[1]);
1296                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1297                 se->se_uuid.bv_len = opc->suuid.bv_len;
1298
1299                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1300                 AC_MEMCPY( se->se_csn.bv_val, op->o_csn.bv_val, op->o_csn.bv_len );
1301                 se->se_csn.bv_val[op->o_csn.bv_len] = '\0';
1302                 se->se_csn.bv_len = op->o_csn.bv_len;
1303
1304                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1305                 if ( sl->sl_head ) {
1306                         sl->sl_tail->se_next = se;
1307                 } else {
1308                         sl->sl_head = se;
1309                 }
1310                 sl->sl_tail = se;
1311                 sl->sl_num++;
1312                 while ( sl->sl_num > sl->sl_size ) {
1313                         se = sl->sl_head;
1314                         sl->sl_head = se->se_next;
1315                         strcpy( sl->sl_mincsn.bv_val, se->se_csn.bv_val );
1316                         sl->sl_mincsn.bv_len = se->se_csn.bv_len;
1317                         ch_free( se );
1318                         sl->sl_num--;
1319                 }
1320                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1321         }
1322 }
1323
1324 /* Just set a flag if we found the matching entry */
1325 static int
1326 playlog_cb( Operation *op, SlapReply *rs )
1327 {
1328         if ( rs->sr_type == REP_SEARCH ) {
1329                 op->o_callback->sc_private = (void *)1;
1330         }
1331         return rs->sr_err;
1332 }
1333
1334 /* enter with sl->sl_mutex locked, release before returning */
1335 static void
1336 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1337         sync_control *srs, struct berval *ctxcsn )
1338 {
1339         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1340         slog_entry *se;
1341         int i, j, ndel, num, nmods, mmods;
1342         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1343         BerVarray uuids;
1344         struct berval delcsn;
1345
1346         if ( !sl->sl_num ) {
1347                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1348                 return;
1349         }
1350
1351         num = sl->sl_num;
1352         i = 0;
1353         nmods = 0;
1354
1355         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1356                 num * UUID_LEN, op->o_tmpmemctx );
1357         uuids[0].bv_val = (char *)(uuids + num + 1);
1358
1359         delcsn.bv_len = 0;
1360         delcsn.bv_val = cbuf;
1361
1362         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1363          * and everything else at the end. Do this first so we can
1364          * unlock the list mutex.
1365          */
1366         for ( se=sl->sl_head; se; se=se->se_next ) {
1367                 if ( ber_bvcmp( &se->se_csn, &srs->sr_state.ctxcsn ) <= 0 ) continue;
1368                 if ( ber_bvcmp( &se->se_csn, ctxcsn ) > 0 ) break;
1369                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1370                         j = i;
1371                         i++;
1372                         AC_MEMCPY( cbuf, se->se_csn.bv_val, se->se_csn.bv_len );
1373                         delcsn.bv_len = se->se_csn.bv_len;
1374                         delcsn.bv_val[delcsn.bv_len] = '\0';
1375                 } else {
1376                         nmods++;
1377                         j = num - nmods;
1378                 }
1379                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1380                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1381                 uuids[j].bv_len = UUID_LEN;
1382         }
1383         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1384
1385         ndel = i;
1386
1387         /* Zero out unused slots */
1388         for ( i=ndel; i < num - nmods; i++ )
1389                 uuids[i].bv_len = 0;
1390
1391         /* Mods must be validated to see if they belong in this delete set.
1392          */
1393
1394         mmods = nmods;
1395         /* Strip any duplicates */
1396         for ( i=0; i<nmods; i++ ) {
1397                 for ( j=0; j<ndel; j++ ) {
1398                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1399                                 uuids[num - 1 - i].bv_len = 0;
1400                                 mmods --;
1401                                 break;
1402                         }
1403                 }
1404                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1405                 for ( j=0; j<i; j++ ) {
1406                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1407                                 uuids[num - 1 - i].bv_len = 0;
1408                                 mmods --;
1409                                 break;
1410                         }
1411                 }
1412         }
1413
1414         if ( mmods ) {
1415                 Operation fop;
1416                 SlapReply frs = { REP_RESULT };
1417                 int rc;
1418                 Filter mf, af;
1419 #ifdef LDAP_COMP_MATCH
1420                 AttributeAssertion eq = { NULL, BER_BVNULL, NULL };
1421 #else
1422                 AttributeAssertion eq;
1423 #endif
1424                 slap_callback cb = {0};
1425
1426                 fop = *op;
1427
1428                 fop.o_sync_mode = 0;
1429                 fop.o_callback = &cb;
1430                 fop.ors_limit = NULL;
1431                 fop.ors_tlimit = SLAP_NO_LIMIT;
1432                 fop.ors_attrs = slap_anlist_all_attributes;
1433                 fop.ors_attrsonly = 0;
1434                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1435
1436                 af.f_choice = LDAP_FILTER_AND;
1437                 af.f_next = NULL;
1438                 af.f_and = &mf;
1439                 mf.f_choice = LDAP_FILTER_EQUALITY;
1440                 mf.f_ava = &eq;
1441                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1442                 mf.f_next = fop.ors_filter;
1443
1444                 fop.ors_filter = &af;
1445
1446                 cb.sc_response = playlog_cb;
1447                 fop.o_bd->bd_info = on->on_info->oi_orig;
1448
1449                 for ( i=ndel; i<num; i++ ) {
1450                         if ( uuids[i].bv_len == 0 ) continue;
1451
1452                         mf.f_av_value = uuids[i];
1453                         cb.sc_private = NULL;
1454                         fop.ors_slimit = 1;
1455                         frs.sr_nentries = 0;
1456                         rc = fop.o_bd->be_search( &fop, &frs );
1457
1458                         /* If entry was not found, add to delete list */
1459                         if ( !cb.sc_private ) {
1460                                 uuids[ndel++] = uuids[i];
1461                         }
1462                 }
1463                 fop.o_bd->bd_info = (BackendInfo *)on;
1464         }
1465         if ( ndel ) {
1466                 struct berval cookie;
1467
1468                 slap_compose_sync_cookie( op, &cookie, &delcsn, srs->sr_state.rid );
1469                 uuids[ndel].bv_val = NULL;
1470                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, &cookie, 0, uuids, 1 );
1471                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1472         }
1473         op->o_tmpfree( uuids, op->o_tmpmemctx );
1474 }
1475
1476 static int
1477 syncprov_op_response( Operation *op, SlapReply *rs )
1478 {
1479         opcookie *opc = op->o_callback->sc_private;
1480         slap_overinst *on = opc->son;
1481         syncprov_info_t         *si = on->on_bi.bi_private;
1482         syncmatches *sm;
1483
1484         if ( rs->sr_err == LDAP_SUCCESS )
1485         {
1486                 struct berval maxcsn = BER_BVNULL;
1487                 char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1488
1489                 /* Update our context CSN */
1490                 cbuf[0] = '\0';
1491                 ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1492                 slap_get_commit_csn( op, &maxcsn, NULL );
1493                 if ( !BER_BVISNULL( &maxcsn ) ) {
1494                         strcpy( cbuf, maxcsn.bv_val );
1495                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn ) > 0 ) {
1496                                 strcpy( si->si_ctxcsnbuf, cbuf );
1497                                 si->si_ctxcsn.bv_len = maxcsn.bv_len;
1498                         }
1499                 }
1500
1501                 /* Don't do any processing for consumer contextCSN updates */
1502                 if ( SLAP_SYNC_SHADOW( op->o_bd ) &&
1503                         op->o_msgid == SLAP_SYNC_UPDATE_MSGID ) {
1504                         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1505                         return SLAP_CB_CONTINUE;
1506                 }
1507
1508                 si->si_numops++;
1509                 if ( si->si_chkops || si->si_chktime ) {
1510                         int do_check=0;
1511                         if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1512                                 do_check = 1;
1513                                 si->si_numops = 0;
1514                         }
1515                         if ( si->si_chktime &&
1516                                 (op->o_time - si->si_chklast >= si->si_chktime )) {
1517                                 do_check = 1;
1518                                 si->si_chklast = op->o_time;
1519                         }
1520                         if ( do_check ) {
1521                                 syncprov_checkpoint( op, rs, on );
1522                         }
1523                 }
1524                 ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1525
1526                 opc->sctxcsn.bv_len = maxcsn.bv_len;
1527                 opc->sctxcsn.bv_val = cbuf;
1528
1529                 /* Handle any persistent searches */
1530                 if ( si->si_ops ) {
1531                         switch(op->o_tag) {
1532                         case LDAP_REQ_ADD:
1533                         case LDAP_REQ_MODIFY:
1534                         case LDAP_REQ_MODRDN:
1535                         case LDAP_REQ_EXTENDED:
1536                                 syncprov_matchops( op, opc, 0 );
1537                                 break;
1538                         case LDAP_REQ_DELETE:
1539                                 /* for each match in opc->smatches:
1540                                  *   send DELETE msg
1541                                  */
1542                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1543                                         if ( sm->sm_op->s_op->o_abandon )
1544                                                 continue;
1545                                         syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_DELETE );
1546                                 }
1547                                 break;
1548                         }
1549                 }
1550
1551                 /* Add any log records */
1552                 if ( si->si_logs && op->o_tag != LDAP_REQ_ADD ) {
1553                         syncprov_add_slog( op );
1554                 }
1555
1556         }
1557         return SLAP_CB_CONTINUE;
1558 }
1559
1560 /* We don't use a subentry to store the context CSN any more.
1561  * We expose the current context CSN as an operational attribute
1562  * of the suffix entry.
1563  */
1564 static int
1565 syncprov_op_compare( Operation *op, SlapReply *rs )
1566 {
1567         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1568         syncprov_info_t         *si = on->on_bi.bi_private;
1569         int rc = SLAP_CB_CONTINUE;
1570
1571         if ( dn_match( &op->o_req_ndn, op->o_bd->be_nsuffix ) &&
1572                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1573         {
1574                 Entry e = {0};
1575                 Attribute a = {0};
1576                 struct berval bv[2];
1577
1578                 e.e_name = op->o_bd->be_suffix[0];
1579                 e.e_nname = op->o_bd->be_nsuffix[0];
1580
1581                 BER_BVZERO( &bv[1] );
1582                 bv[0] = si->si_ctxcsn;
1583
1584                 a.a_desc = slap_schema.si_ad_contextCSN;
1585                 a.a_vals = bv;
1586                 a.a_nvals = a.a_vals;
1587
1588                 ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1589
1590                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1591                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1592                 if ( ! rs->sr_err ) {
1593                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1594                         goto return_results;
1595                 }
1596
1597                 if ( get_assert( op ) &&
1598                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
1599                 {
1600                         rs->sr_err = LDAP_ASSERTION_FAILED;
1601                         goto return_results;
1602                 }
1603
1604
1605                 rs->sr_err = LDAP_COMPARE_FALSE;
1606
1607                 if ( value_find_ex( op->oq_compare.rs_ava->aa_desc,
1608                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
1609                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
1610                                 a.a_nvals, &op->oq_compare.rs_ava->aa_value, op->o_tmpmemctx ) == 0 )
1611                 {
1612                         rs->sr_err = LDAP_COMPARE_TRUE;
1613                 }
1614
1615 return_results:;
1616
1617                 ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1618
1619                 send_ldap_result( op, rs );
1620
1621                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
1622                         rs->sr_err = LDAP_SUCCESS;
1623                 }
1624                 rc = rs->sr_err;
1625         }
1626
1627         return rc;
1628 }
1629
1630 static int
1631 syncprov_op_mod( Operation *op, SlapReply *rs )
1632 {
1633         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1634         syncprov_info_t         *si = on->on_bi.bi_private;
1635
1636         slap_callback *cb = op->o_tmpcalloc(1, sizeof(slap_callback)+
1637                 sizeof(opcookie) +
1638                 (si->si_ops ? sizeof(modinst) : 0 ),
1639                 op->o_tmpmemctx);
1640         opcookie *opc = (opcookie *)(cb+1);
1641         opc->son = on;
1642         cb->sc_response = syncprov_op_response;
1643         cb->sc_cleanup = syncprov_op_cleanup;
1644         cb->sc_private = opc;
1645         cb->sc_next = op->o_callback;
1646         op->o_callback = cb;
1647
1648         /* If there are active persistent searches, lock this operation.
1649          * See seqmod.c for the locking logic on its own.
1650          */
1651         if ( si->si_ops ) {
1652                 modtarget *mt, mtdummy;
1653                 modinst *mi;
1654
1655                 mi = (modinst *)(opc+1);
1656                 mi->mi_op = op;
1657
1658                 /* See if we're already modifying this entry... */
1659                 mtdummy.mt_op = op;
1660                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1661                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1662                 if ( mt ) {
1663                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1664                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1665                         mt->mt_tail->mi_next = mi;
1666                         mt->mt_tail = mi;
1667                         /* wait for this op to get to head of list */
1668                         while ( mt->mt_mods != mi ) {
1669                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1670                                 ldap_pvt_thread_yield();
1671                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1672
1673                                 /* clean up if the caller is giving up */
1674                                 if ( op->o_abandon ) {
1675                                         modinst *m2;
1676                                         for ( m2 = mt->mt_mods; m2->mi_next != mi;
1677                                                 m2 = m2->mi_next );
1678                                         m2->mi_next = mi->mi_next;
1679                                         if ( mt->mt_tail == mi ) mt->mt_tail = m2;
1680                                         op->o_tmpfree( cb, op->o_tmpmemctx );
1681                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1682                                         return SLAPD_ABANDON;
1683                                 }
1684                         }
1685                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1686                 } else {
1687                         /* Record that we're modifying this entry now */
1688                         mt = ch_malloc( sizeof(modtarget) );
1689                         mt->mt_mods = mi;
1690                         mt->mt_tail = mi;
1691                         mt->mt_op = mi->mi_op;
1692                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
1693                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
1694                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1695                 }
1696         }
1697
1698         if (( si->si_ops || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
1699                 syncprov_matchops( op, opc, 1 );
1700
1701         return SLAP_CB_CONTINUE;
1702 }
1703
1704 static int
1705 syncprov_op_extended( Operation *op, SlapReply *rs )
1706 {
1707         if ( exop_is_write( op ))
1708                 return syncprov_op_mod( op, rs );
1709
1710         return SLAP_CB_CONTINUE;
1711 }
1712
1713 typedef struct searchstate {
1714         slap_overinst *ss_on;
1715         syncops *ss_so;
1716         int ss_present;
1717         struct berval ss_ctxcsn;
1718         char ss_csnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1719 } searchstate;
1720
1721 static int
1722 syncprov_search_cleanup( Operation *op, SlapReply *rs )
1723 {
1724         if ( rs->sr_ctrls ) {
1725                 op->o_tmpfree( rs->sr_ctrls[0], op->o_tmpmemctx );
1726                 op->o_tmpfree( rs->sr_ctrls, op->o_tmpmemctx );
1727                 rs->sr_ctrls = NULL;
1728         }
1729         return 0;
1730 }
1731
1732 static void
1733 syncprov_detach_op( Operation *op, syncops *so, slap_overinst *on )
1734 {
1735         Operation *op2;
1736         int i, alen = 0;
1737         size_t size;
1738         char *ptr;
1739         GroupAssertion *g1, *g2;
1740
1741         /* count the search attrs */
1742         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1743                 alen += op->ors_attrs[i].an_name.bv_len + 1;
1744         }
1745         /* Make a new copy of the operation */
1746         size = sizeof(Operation) + sizeof(Opheader) +
1747                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
1748                 op->o_req_dn.bv_len + 1 +
1749                 op->o_req_ndn.bv_len + 1 +
1750                 op->o_ndn.bv_len + 1 +
1751                 so->s_filterstr.bv_len + 1;
1752         op2 = (Operation *)ch_calloc( 1, size );
1753         op2->o_hdr = (Opheader *)(op2+1);
1754
1755         /* Copy the fields we care about explicitly, leave the rest alone */
1756         *op2->o_hdr = *op->o_hdr;
1757         op2->o_tag = op->o_tag;
1758         op2->o_time = op->o_time;
1759         op2->o_bd = on->on_info->oi_origdb;
1760         op2->o_request = op->o_request;
1761         op2->o_private = on;
1762
1763         if ( i ) {
1764                 op2->ors_attrs = (AttributeName *)(op2->o_hdr + 1);
1765                 ptr = (char *)(op2->ors_attrs+i+1);
1766                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1767                         op2->ors_attrs[i] = op->ors_attrs[i];
1768                         op2->ors_attrs[i].an_name.bv_val = ptr;
1769                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
1770                 }
1771                 BER_BVZERO( &op2->ors_attrs[i].an_name );
1772         } else {
1773                 ptr = (char *)(op2->o_hdr + 1);
1774         }
1775         op2->o_authz = op->o_authz;
1776         op2->o_ndn.bv_val = ptr;
1777         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
1778         op2->o_dn = op2->o_ndn;
1779         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
1780         op2->o_req_dn.bv_val = ptr;
1781         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
1782         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
1783         op2->o_req_ndn.bv_val = ptr;
1784         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
1785         op2->ors_filterstr.bv_val = ptr;
1786         strcpy( ptr, so->s_filterstr.bv_val );
1787         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
1788         op2->ors_filter = filter_dup( op->ors_filter, NULL );
1789         so->s_op = op2;
1790
1791         /* Copy any cached group ACLs individually */
1792         op2->o_groups = NULL;
1793         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
1794                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
1795                 *g2 = *g1;
1796                 strcpy( g2->ga_ndn, g1->ga_ndn );
1797                 g2->ga_next = op2->o_groups;
1798                 op2->o_groups = g2;
1799         }
1800         /* Don't allow any further group caching */
1801         op2->o_do_not_cache = 1;
1802
1803         /* Add op2 to conn so abandon will find us */
1804         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
1805         op->o_conn->c_n_ops_executing++;
1806         op->o_conn->c_n_ops_completed--;
1807         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
1808         so->s_flags |= PS_IS_DETACHED;
1809         ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
1810
1811         /* Prevent anyone else from trying to send a result for this op */
1812         op->o_abandon = 1;
1813 }
1814
1815 static int
1816 syncprov_search_response( Operation *op, SlapReply *rs )
1817 {
1818         searchstate *ss = op->o_callback->sc_private;
1819         slap_overinst *on = ss->ss_on;
1820         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
1821
1822         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
1823                 Attribute *a;
1824                 /* If we got a referral without a referral object, there's
1825                  * something missing that we cannot replicate. Just ignore it.
1826                  * The consumer will abort because we didn't send the expected
1827                  * control.
1828                  */
1829                 if ( !rs->sr_entry ) {
1830                         assert( rs->sr_entry != NULL );
1831                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
1832                         return SLAP_CB_CONTINUE;
1833                 }
1834                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryCSN );
1835                 if ( a == NULL && rs->sr_operational_attrs != NULL ) {
1836                         a = attr_find( rs->sr_operational_attrs, slap_schema.si_ad_entryCSN );
1837                 }
1838                 if ( a ) {
1839                         /* Make sure entry is less than the snapshot'd contextCSN */
1840                         if ( ber_bvcmp( &a->a_nvals[0], &ss->ss_ctxcsn ) > 0 ) {
1841                                 Debug( LDAP_DEBUG_SYNC, "Entry %s CSN %s greater than snapshot %s\n",
1842                                         rs->sr_entry->e_name.bv_val,
1843                                         a->a_nvals[0].bv_val,
1844                                         ss->ss_ctxcsn.bv_val );
1845                                 return LDAP_SUCCESS;
1846                         }
1847
1848                         /* Don't send the ctx entry twice */
1849                         if ( !BER_BVISNULL( &srs->sr_state.ctxcsn ) &&
1850                                 bvmatch( &a->a_nvals[0], &srs->sr_state.ctxcsn ) ) {
1851                                 Debug( LDAP_DEBUG_SYNC, "Entry %s CSN %s matches ctx %s\n",
1852                                         rs->sr_entry->e_name.bv_val,
1853                                         a->a_nvals[0].bv_val,
1854                                         srs->sr_state.ctxcsn.bv_val );
1855                                 return LDAP_SUCCESS;
1856                         }
1857                 }
1858                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1859                         op->o_tmpmemctx );
1860                 rs->sr_ctrls[1] = NULL;
1861                 rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
1862                         LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
1863         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
1864                 struct berval cookie;
1865
1866                 slap_compose_sync_cookie( op, &cookie, &ss->ss_ctxcsn,
1867                         srs->sr_state.rid );
1868
1869                 /* Is this a regular refresh? */
1870                 if ( !ss->ss_so ) {
1871                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1872                                 op->o_tmpmemctx );
1873                         rs->sr_ctrls[1] = NULL;
1874                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
1875                                 0, 1, &cookie, ss->ss_present ?  LDAP_SYNC_REFRESH_PRESENTS :
1876                                         LDAP_SYNC_REFRESH_DELETES );
1877                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1878                 } else {
1879                 /* It's RefreshAndPersist, transition to Persist phase */
1880                         syncprov_sendinfo( op, rs, ( ss->ss_present && rs->sr_nentries ) ?
1881                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
1882                                 &cookie, 1, NULL, 0 );
1883                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1884
1885                         /* Detach this Op from frontend control */
1886                         ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
1887
1888                         /* Turn off the refreshing flag */
1889                         ss->ss_so->s_flags ^= PS_IS_REFRESHING;
1890
1891                         syncprov_detach_op( op, ss->ss_so, on );
1892                         ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
1893
1894                         return LDAP_SUCCESS;
1895                 }
1896         }
1897
1898         return SLAP_CB_CONTINUE;
1899 }
1900
1901 static int
1902 syncprov_op_search( Operation *op, SlapReply *rs )
1903 {
1904         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1905         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
1906         slap_callback   *cb;
1907         int gotstate = 0, nochange = 0, do_present;
1908         syncops *sop = NULL;
1909         searchstate *ss;
1910         sync_control *srs;
1911         struct berval ctxcsn;
1912         char csnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1913
1914         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
1915
1916         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
1917                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
1918                 return rs->sr_err;
1919         }
1920
1921         do_present = si->si_nopres ? 0 : 1;
1922
1923         srs = op->o_controls[slap_cids.sc_LDAPsync];
1924         op->o_managedsait = SLAP_CONTROL_NONCRITICAL;
1925
1926         /* If this is a persistent search, set it up right away */
1927         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
1928                 syncops so = {0};
1929                 fbase_cookie fc;
1930                 opcookie opc;
1931                 slap_callback sc;
1932
1933                 fc.fss = &so;
1934                 fc.fbase = 0;
1935                 so.s_eid = NOID;
1936                 so.s_op = op;
1937                 so.s_flags = PS_IS_REFRESHING | PS_FIND_BASE;
1938                 /* syncprov_findbase expects to be called as a callback... */
1939                 sc.sc_private = &opc;
1940                 opc.son = on;
1941                 ldap_pvt_thread_mutex_init( &so.s_mutex );
1942                 cb = op->o_callback;
1943                 op->o_callback = &sc;
1944                 rs->sr_err = syncprov_findbase( op, &fc );
1945                 op->o_callback = cb;
1946                 ldap_pvt_thread_mutex_destroy( &so.s_mutex );
1947
1948                 if ( rs->sr_err != LDAP_SUCCESS ) {
1949                         send_ldap_result( op, rs );
1950                         return rs->sr_err;
1951                 }
1952                 sop = ch_malloc( sizeof( syncops ));
1953                 *sop = so;
1954                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
1955                 sop->s_rid = srs->sr_state.rid;
1956                 sop->s_inuse = 1;
1957
1958                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1959                 sop->s_next = si->si_ops;
1960                 si->si_ops = sop;
1961                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1962         }
1963
1964         /* snapshot the ctxcsn */
1965         ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1966         strcpy( csnbuf, si->si_ctxcsnbuf );
1967         ctxcsn.bv_len = si->si_ctxcsn.bv_len;
1968         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1969         ctxcsn.bv_val = csnbuf;
1970
1971         /* If we have a cookie, handle the PRESENT lookups */
1972         if ( !BER_BVISNULL( &srs->sr_state.ctxcsn )) {
1973                 sessionlog *sl;
1974
1975                 /* The cookie was validated when it was parsed, just use it */
1976
1977                 /* If just Refreshing and nothing has changed, shortcut it */
1978                 if ( bvmatch( &srs->sr_state.ctxcsn, &ctxcsn )) {
1979                         nochange = 1;
1980                         if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
1981                                 LDAPControl     *ctrls[2];
1982
1983                                 ctrls[0] = NULL;
1984                                 ctrls[1] = NULL;
1985                                 syncprov_done_ctrl( op, rs, ctrls, 0, 0,
1986                                         NULL, LDAP_SYNC_REFRESH_DELETES );
1987                                 rs->sr_ctrls = ctrls;
1988                                 rs->sr_err = LDAP_SUCCESS;
1989                                 send_ldap_result( op, rs );
1990                                 rs->sr_ctrls = NULL;
1991                                 return rs->sr_err;
1992                         }
1993                         goto shortcut;
1994                 }
1995                 /* Do we have a sessionlog for this search? */
1996                 sl=si->si_logs;
1997                 if ( sl ) {
1998                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1999                         if ( ber_bvcmp( &srs->sr_state.ctxcsn, &sl->sl_mincsn ) >= 0 ) {
2000                                 do_present = 0;
2001                                 /* mutex is unlocked in playlog */
2002                                 syncprov_playlog( op, rs, sl, srs, &ctxcsn );
2003                         } else {
2004                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
2005                         }
2006                 }
2007                 /* Is the CSN still present in the database? */
2008                 if ( syncprov_findcsn( op, FIND_CSN ) != LDAP_SUCCESS ) {
2009                         /* No, so a reload is required */
2010                         /* the 2.2 consumer doesn't send this hint */
2011                         if ( si->si_usehint && srs->sr_rhint == 0 ) {
2012                                 send_ldap_error( op, rs, LDAP_SYNC_REFRESH_REQUIRED, "sync cookie is stale" );
2013                                 return rs->sr_err;
2014                         }
2015                 } else {
2016                         gotstate = 1;
2017                         /* If changed and doing Present lookup, send Present UUIDs */
2018                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT ) !=
2019                                 LDAP_SUCCESS ) {
2020                                 send_ldap_result( op, rs );
2021                                 return rs->sr_err;
2022                         }
2023                 }
2024         }
2025
2026 shortcut:
2027         /* Append CSN range to search filter, save original filter
2028          * for persistent search evaluation
2029          */
2030         if ( sop ) {
2031                 sop->s_filterstr= op->ors_filterstr;
2032         }
2033
2034         /* If something changed, find the changes */
2035         if ( gotstate && !nochange ) {
2036                 Filter *fand, *fava;
2037
2038                 fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2039                 fand->f_choice = LDAP_FILTER_AND;
2040                 fand->f_next = NULL;
2041                 fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2042                 fand->f_and = fava;
2043                 fava->f_choice = LDAP_FILTER_GE;
2044                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
2045                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
2046 #ifdef LDAP_COMP_MATCH
2047                 fava->f_ava->aa_cf = NULL;
2048 #endif
2049                 ber_dupbv_x( &fava->f_ava->aa_value, &srs->sr_state.ctxcsn, op->o_tmpmemctx );
2050                 fava->f_next = op->ors_filter;
2051                 op->ors_filter = fand;
2052                 filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
2053         }
2054
2055         /* Let our callback add needed info to returned entries */
2056         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
2057         ss = (searchstate *)(cb+1);
2058         ss->ss_on = on;
2059         ss->ss_so = sop;
2060         ss->ss_present = do_present;
2061         ss->ss_ctxcsn.bv_len = ctxcsn.bv_len;
2062         ss->ss_ctxcsn.bv_val = ss->ss_csnbuf;
2063         strcpy( ss->ss_ctxcsn.bv_val, ctxcsn.bv_val );
2064         cb->sc_response = syncprov_search_response;
2065         cb->sc_cleanup = syncprov_search_cleanup;
2066         cb->sc_private = ss;
2067         cb->sc_next = op->o_callback;
2068         op->o_callback = cb;
2069
2070 #if 0   /* I don't think we need to shortcircuit back-bdb any more */
2071         op->o_sync_mode &= SLAP_CONTROL_MASK;
2072 #endif
2073
2074         /* If this is a persistent search and no changes were reported during
2075          * the refresh phase, just invoke the response callback to transition
2076          * us into persist phase
2077          */
2078         if ( nochange ) {
2079                 rs->sr_err = LDAP_SUCCESS;
2080                 rs->sr_nentries = 0;
2081                 send_ldap_result( op, rs );
2082                 return rs->sr_err;
2083         }
2084         return SLAP_CB_CONTINUE;
2085 }
2086
2087 static int
2088 syncprov_operational(
2089         Operation *op,
2090         SlapReply *rs )
2091 {
2092         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2093         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2094
2095         if ( rs->sr_entry &&
2096                 dn_match( &rs->sr_entry->e_nname, op->o_bd->be_nsuffix )) {
2097
2098                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
2099                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
2100                         Attribute *a, **ap = NULL;
2101
2102                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
2103                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
2104                                         break;
2105                         }
2106
2107                         if ( !a ) {
2108                                 for ( ap = &rs->sr_operational_attrs; *ap; ap=&(*ap)->a_next );
2109
2110                                 a = ch_malloc( sizeof(Attribute));
2111                                 a->a_desc = slap_schema.si_ad_contextCSN;
2112                                 a->a_vals = ch_malloc( 2 * sizeof(struct berval));
2113                                 a->a_vals[1].bv_val = NULL;
2114                                 a->a_nvals = a->a_vals;
2115                                 a->a_next = NULL;
2116                                 a->a_flags = 0;
2117                                 *ap = a;
2118                         }
2119
2120                         ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
2121                         if ( !ap ) {
2122                                 strcpy( a->a_vals[0].bv_val, si->si_ctxcsnbuf );
2123                         } else {
2124                                 ber_dupbv( &a->a_vals[0], &si->si_ctxcsn );
2125                         }
2126                         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
2127                 }
2128         }
2129         return SLAP_CB_CONTINUE;
2130 }
2131
2132 enum {
2133         SP_CHKPT = 1,
2134         SP_SESSL,
2135         SP_NOPRES,
2136         SP_USEHINT
2137 };
2138
2139 static ConfigDriver sp_cf_gen;
2140
2141 static ConfigTable spcfg[] = {
2142         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2143                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2144                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2145                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2146         { "syncprov-sessionlog", "ops", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2147                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2148                         "DESC 'Session log size in ops' "
2149                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2150         { "syncprov-nopresent", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_NOPRES,
2151                 sp_cf_gen, "( OLcfgOvAt:1.3 NAME 'olcSpNoPresent' "
2152                         "DESC 'Omit Present phase processing' "
2153                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2154         { "syncprov-reloadhint", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_USEHINT,
2155                 sp_cf_gen, "( OLcfgOvAt:1.4 NAME 'olcSpReloadHint' "
2156                         "DESC 'Observe Reload Hint in Request control' "
2157                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2158         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2159 };
2160
2161 static ConfigOCs spocs[] = {
2162         { "( OLcfgOvOc:1.1 "
2163                 "NAME 'olcSyncProvConfig' "
2164                 "DESC 'SyncRepl Provider configuration' "
2165                 "SUP olcOverlayConfig "
2166                 "MAY ( olcSpCheckpoint $ olcSpSessionlog $ olcSpNoPresent ) )",
2167                         Cft_Overlay, spcfg },
2168         { NULL, 0, NULL }
2169 };
2170
2171 static int
2172 sp_cf_gen(ConfigArgs *c)
2173 {
2174         slap_overinst           *on = (slap_overinst *)c->bi;
2175         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2176         int rc = 0;
2177
2178         if ( c->op == SLAP_CONFIG_EMIT ) {
2179                 switch ( c->type ) {
2180                 case SP_CHKPT:
2181                         if ( si->si_chkops || si->si_chktime ) {
2182                                 struct berval bv;
2183                                 bv.bv_len = sprintf( c->msg, "%d %d",
2184                                         si->si_chkops, si->si_chktime );
2185                                 bv.bv_val = c->msg;
2186                                 value_add_one( &c->rvalue_vals, &bv );
2187                         } else {
2188                                 rc = 1;
2189                         }
2190                         break;
2191                 case SP_SESSL:
2192                         if ( si->si_logs ) {
2193                                 c->value_int = si->si_logs->sl_size;
2194                         } else {
2195                                 rc = 1;
2196                         }
2197                         break;
2198                 case SP_NOPRES:
2199                         if ( si->si_nopres ) {
2200                                 c->value_int = 1;
2201                         } else {
2202                                 rc = 1;
2203                         }
2204                         break;
2205                 case SP_USEHINT:
2206                         if ( si->si_usehint ) {
2207                                 c->value_int = 1;
2208                         } else {
2209                                 rc = 1;
2210                         }
2211                         break;
2212                 }
2213                 return rc;
2214         } else if ( c->op == LDAP_MOD_DELETE ) {
2215                 switch ( c->type ) {
2216                 case SP_CHKPT:
2217                         si->si_chkops = 0;
2218                         si->si_chktime = 0;
2219                         break;
2220                 case SP_SESSL:
2221                         if ( si->si_logs )
2222                                 si->si_logs->sl_size = 0;
2223                         else
2224                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2225                         break;
2226                 case SP_NOPRES:
2227                         if ( si->si_nopres )
2228                                 si->si_nopres = 0;
2229                         else
2230                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2231                         break;
2232                 case SP_USEHINT:
2233                         if ( si->si_usehint )
2234                                 si->si_usehint = 0;
2235                         else
2236                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2237                         break;
2238                 }
2239                 return rc;
2240         }
2241         switch ( c->type ) {
2242         case SP_CHKPT:
2243                 if ( lutil_atoi( &si->si_chkops, c->argv[1] ) != 0 ) {
2244                         sprintf( c->msg, "%s unable to parse checkpoint ops # \"%s\"",
2245                                 c->argv[0], c->argv[1] );
2246                         Debug( LDAP_DEBUG_CONFIG, "%s: %s\n", c->log, c->msg, 0 );
2247                         return ARG_BAD_CONF;
2248                 }
2249                 if ( si->si_chkops <= 0 ) {
2250                         sprintf( c->msg, "%s invalid checkpoint ops # \"%d\"",
2251                                 c->argv[0], si->si_chkops );
2252                         Debug( LDAP_DEBUG_CONFIG, "%s: %s\n", c->log, c->msg, 0 );
2253                         return ARG_BAD_CONF;
2254                 }
2255                 if ( lutil_atoi( &si->si_chktime, c->argv[2] ) != 0 ) {
2256                         sprintf( c->msg, "%s unable to parse checkpoint time \"%s\"",
2257                                 c->argv[0], c->argv[1] );
2258                         Debug( LDAP_DEBUG_CONFIG, "%s: %s\n", c->log, c->msg, 0 );
2259                         return ARG_BAD_CONF;
2260                 }
2261                 if ( si->si_chktime <= 0 ) {
2262                         sprintf( c->msg, "%s invalid checkpoint time \"%d\"",
2263                                 c->argv[0], si->si_chkops );
2264                         Debug( LDAP_DEBUG_CONFIG, "%s: %s\n", c->log, c->msg, 0 );
2265                         return ARG_BAD_CONF;
2266                 }
2267                 si->si_chktime *= 60;
2268                 break;
2269         case SP_SESSL: {
2270                 sessionlog *sl;
2271                 int size = c->value_int;
2272
2273                 if ( size < 0 ) {
2274                         sprintf( c->msg, "%s size %d is negative",
2275                                 c->argv[0], size );
2276                         Debug( LDAP_DEBUG_CONFIG, "%s: %s\n", c->log, c->msg, 0 );
2277                         return ARG_BAD_CONF;
2278                 }
2279                 sl = si->si_logs;
2280                 if ( !sl ) {
2281                         sl = ch_malloc( sizeof( sessionlog ) + LDAP_LUTIL_CSNSTR_BUFSIZE );
2282                         sl->sl_mincsn.bv_val = (char *)(sl+1);
2283                         sl->sl_mincsn.bv_len = 0;
2284                         sl->sl_num = 0;
2285                         sl->sl_head = sl->sl_tail = NULL;
2286                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
2287                         si->si_logs = sl;
2288                 }
2289                 sl->sl_size = size;
2290                 }
2291                 break;
2292         case SP_NOPRES:
2293                 si->si_nopres = c->value_int;
2294                 break;
2295         case SP_USEHINT:
2296                 si->si_usehint = c->value_int;
2297                 break;
2298         }
2299         return rc;
2300 }
2301
2302 /* ITS#3456 we cannot run this search on the main thread, must use a
2303  * child thread in order to insure we have a big enough stack.
2304  */
2305 static void *
2306 syncprov_db_otask(
2307         void *ptr
2308 )
2309 {
2310         syncprov_findcsn( ptr, FIND_MAXCSN );
2311         return NULL;
2312 }
2313
2314 /* Read any existing contextCSN from the underlying db.
2315  * Then search for any entries newer than that. If no value exists,
2316  * just generate it. Cache whatever result.
2317  */
2318 static int
2319 syncprov_db_open(
2320     BackendDB *be
2321 )
2322 {
2323         slap_overinst   *on = (slap_overinst *) be->bd_info;
2324         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2325
2326         Connection conn = { 0 };
2327         OperationBuffer opbuf = { 0 };
2328         char ctxcsnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
2329         Operation *op = (Operation *) &opbuf;
2330         Entry *e;
2331         Attribute *a;
2332         int rc;
2333         void *thrctx = NULL;
2334
2335         if ( !SLAP_LASTMOD( be )) {
2336                 Debug( LDAP_DEBUG_ANY,
2337                         "syncprov_db_open: invalid config, lastmod must be enabled\n", 0, 0, 0 );
2338                 return -1;
2339         }
2340
2341         if ( slapMode & SLAP_TOOL_MODE ) {
2342                 return 0;
2343         }
2344
2345         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
2346         if ( rc ) {
2347                 return rc;
2348         }
2349
2350         thrctx = ldap_pvt_thread_pool_context();
2351         connection_fake_init( &conn, op, thrctx );
2352         op->o_bd = be;
2353         op->o_dn = be->be_rootdn;
2354         op->o_ndn = be->be_rootndn;
2355
2356         ctxcsnbuf[0] = '\0';
2357
2358         op->o_bd->bd_info = on->on_info->oi_orig;
2359         rc = be_entry_get_rw( op, be->be_nsuffix, NULL,
2360                 slap_schema.si_ad_contextCSN, 0, &e );
2361
2362         if ( e ) {
2363                 ldap_pvt_thread_t tid;
2364
2365                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
2366                 if ( a ) {
2367                         si->si_ctxcsn.bv_len = a->a_nvals[0].bv_len;
2368                         if ( si->si_ctxcsn.bv_len >= sizeof(si->si_ctxcsnbuf ))
2369                                 si->si_ctxcsn.bv_len = sizeof(si->si_ctxcsnbuf)-1;
2370                         strncpy( si->si_ctxcsnbuf, a->a_nvals[0].bv_val,
2371                                 si->si_ctxcsn.bv_len );
2372                         si->si_ctxcsnbuf[si->si_ctxcsn.bv_len] = '\0';
2373                         strcpy( ctxcsnbuf, si->si_ctxcsnbuf );
2374                 }
2375                 be_entry_release_rw( op, e, 0 );
2376                 if ( !BER_BVISEMPTY( &si->si_ctxcsn ) ) {
2377                         op->o_bd->bd_info = (BackendInfo *)on;
2378                         op->o_req_dn = be->be_suffix[0];
2379                         op->o_req_ndn = be->be_nsuffix[0];
2380                         op->ors_scope = LDAP_SCOPE_SUBTREE;
2381                         ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
2382                         ldap_pvt_thread_join( tid, NULL );
2383                 }
2384         }
2385
2386         if ( BER_BVISEMPTY( &si->si_ctxcsn ) ) {
2387                 if ( SLAP_SYNC_SHADOW( op->o_bd )) {
2388                 /* If we're also a consumer, and we didn't get a contextCSN,
2389                  * then don't generate anything, wait for our provider to send it
2390                  * to us.
2391                  */
2392                         goto out;
2393                 }
2394                 si->si_ctxcsn.bv_len = sizeof( si->si_ctxcsnbuf );
2395                 slap_get_csn( op, &si->si_ctxcsn, 0 );
2396         }
2397
2398         /* If our ctxcsn is different from what was read from the root
2399          * entry, make sure we do a checkpoint on close
2400          */
2401         if ( strcmp( si->si_ctxcsnbuf, ctxcsnbuf )) {
2402                 si->si_numops++;
2403         }
2404
2405 out:
2406         op->o_bd->bd_info = (BackendInfo *)on;
2407         ldap_pvt_thread_pool_context_reset( thrctx );
2408         return 0;
2409 }
2410
2411 /* Write the current contextCSN into the underlying db.
2412  */
2413 static int
2414 syncprov_db_close(
2415     BackendDB *be
2416 )
2417 {
2418     slap_overinst   *on = (slap_overinst *) be->bd_info;
2419     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2420
2421         if ( slapMode & SLAP_TOOL_MODE ) {
2422                 return 0;
2423         }
2424         if ( si->si_numops ) {
2425                 Connection conn;
2426                 OperationBuffer opbuf;
2427                 Operation *op = (Operation *) &opbuf;
2428                 SlapReply rs = {REP_RESULT};
2429                 void *thrctx;
2430
2431                 thrctx = ldap_pvt_thread_pool_context();
2432                 connection_fake_init( &conn, op, thrctx );
2433                 op->o_bd = be;
2434                 op->o_dn = be->be_rootdn;
2435                 op->o_ndn = be->be_rootndn;
2436                 syncprov_checkpoint( op, &rs, on );
2437                 ldap_pvt_thread_pool_context_reset( thrctx );
2438         }
2439
2440     return 0;
2441 }
2442
2443 static int
2444 syncprov_db_init(
2445         BackendDB *be
2446 )
2447 {
2448         slap_overinst   *on = (slap_overinst *)be->bd_info;
2449         syncprov_info_t *si;
2450
2451         si = ch_calloc(1, sizeof(syncprov_info_t));
2452         on->on_bi.bi_private = si;
2453         ldap_pvt_thread_mutex_init( &si->si_csn_mutex );
2454         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
2455         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
2456         si->si_ctxcsn.bv_val = si->si_ctxcsnbuf;
2457
2458         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
2459         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
2460         csn_anlist[1].an_desc = slap_schema.si_ad_entryUUID;
2461         csn_anlist[1].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2462
2463         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
2464         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2465
2466         return 0;
2467 }
2468
2469 static int
2470 syncprov_db_destroy(
2471         BackendDB *be
2472 )
2473 {
2474         slap_overinst   *on = (slap_overinst *)be->bd_info;
2475         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2476
2477         if ( si ) {
2478                 if ( si->si_logs ) {
2479                         slog_entry *se = si->si_logs->sl_head;
2480
2481                         while ( se ) {
2482                                 slog_entry *se_next = se->se_next;
2483                                 ch_free( se );
2484                                 se = se_next;
2485                         }
2486
2487                         ch_free( si->si_logs );
2488                 }
2489                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
2490                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
2491                 ldap_pvt_thread_mutex_destroy( &si->si_csn_mutex );
2492                 ch_free( si );
2493         }
2494
2495         return 0;
2496 }
2497
2498 static int syncprov_parseCtrl (
2499         Operation *op,
2500         SlapReply *rs,
2501         LDAPControl *ctrl )
2502 {
2503         ber_tag_t tag;
2504         BerElementBuffer berbuf;
2505         BerElement *ber = (BerElement *)&berbuf;
2506         ber_int_t mode;
2507         ber_len_t len;
2508         struct berval cookie = BER_BVNULL;
2509         sync_control *sr;
2510         int rhint = 0;
2511
2512         if ( op->o_sync != SLAP_CONTROL_NONE ) {
2513                 rs->sr_text = "Sync control specified multiple times";
2514                 return LDAP_PROTOCOL_ERROR;
2515         }
2516
2517         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
2518                 rs->sr_text = "Sync control specified with pagedResults control";
2519                 return LDAP_PROTOCOL_ERROR;
2520         }
2521
2522         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
2523                 rs->sr_text = "Sync control value is empty (or absent)";
2524                 return LDAP_PROTOCOL_ERROR;
2525         }
2526
2527         /* Parse the control value
2528          *      syncRequestValue ::= SEQUENCE {
2529          *              mode   ENUMERATED {
2530          *                      -- 0 unused
2531          *                      refreshOnly             (1),
2532          *                      -- 2 reserved
2533          *                      refreshAndPersist       (3)
2534          *              },
2535          *              cookie  syncCookie OPTIONAL
2536          *      }
2537          */
2538
2539         ber_init2( ber, &ctrl->ldctl_value, 0 );
2540
2541         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
2542                 rs->sr_text = "Sync control : mode decoding error";
2543                 return LDAP_PROTOCOL_ERROR;
2544         }
2545
2546         switch( mode ) {
2547         case LDAP_SYNC_REFRESH_ONLY:
2548                 mode = SLAP_SYNC_REFRESH;
2549                 break;
2550         case LDAP_SYNC_REFRESH_AND_PERSIST:
2551                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
2552                 break;
2553         default:
2554                 rs->sr_text = "Sync control : unknown update mode";
2555                 return LDAP_PROTOCOL_ERROR;
2556         }
2557
2558         tag = ber_peek_tag( ber, &len );
2559
2560         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
2561                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
2562                         rs->sr_text = "Sync control : cookie decoding error";
2563                         return LDAP_PROTOCOL_ERROR;
2564                 }
2565                 tag = ber_peek_tag( ber, &len );
2566         }
2567         if ( tag == LDAP_TAG_RELOAD_HINT ) {
2568                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
2569                         rs->sr_text = "Sync control : rhint decoding error";
2570                         return LDAP_PROTOCOL_ERROR;
2571                 }
2572         }
2573         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
2574                         rs->sr_text = "Sync control : decoding error";
2575                         return LDAP_PROTOCOL_ERROR;
2576         }
2577         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
2578         sr->sr_rhint = rhint;
2579         if (!BER_BVISNULL(&cookie)) {
2580                 ber_dupbv_x( &sr->sr_state.octet_str, &cookie, op->o_tmpmemctx );
2581                 slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx );
2582                 if ( sr->sr_state.rid == -1 ) {
2583                         rs->sr_text = "Sync control : cookie parsing error";
2584                         return LDAP_PROTOCOL_ERROR;
2585                 }
2586         }
2587
2588         op->o_controls[slap_cids.sc_LDAPsync] = sr;
2589
2590         op->o_sync = ctrl->ldctl_iscritical
2591                 ? SLAP_CONTROL_CRITICAL
2592                 : SLAP_CONTROL_NONCRITICAL;
2593
2594         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
2595
2596         return LDAP_SUCCESS;
2597 }
2598
2599 /* This overlay is set up for dynamic loading via moduleload. For static
2600  * configuration, you'll need to arrange for the slap_overinst to be
2601  * initialized and registered by some other function inside slapd.
2602  */
2603
2604 static slap_overinst            syncprov;
2605
2606 int
2607 syncprov_initialize()
2608 {
2609         int rc;
2610
2611         rc = register_supported_control( LDAP_CONTROL_SYNC,
2612                 SLAP_CTRL_SEARCH, NULL,
2613                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
2614         if ( rc != LDAP_SUCCESS ) {
2615                 Debug( LDAP_DEBUG_ANY,
2616                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
2617                 return rc;
2618         }
2619
2620         syncprov.on_bi.bi_type = "syncprov";
2621         syncprov.on_bi.bi_db_init = syncprov_db_init;
2622         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
2623         syncprov.on_bi.bi_db_open = syncprov_db_open;
2624         syncprov.on_bi.bi_db_close = syncprov_db_close;
2625
2626         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
2627         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
2628
2629         syncprov.on_bi.bi_op_add = syncprov_op_mod;
2630         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
2631         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
2632         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
2633         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
2634         syncprov.on_bi.bi_op_search = syncprov_op_search;
2635         syncprov.on_bi.bi_extended = syncprov_op_extended;
2636         syncprov.on_bi.bi_operational = syncprov_operational;
2637
2638         syncprov.on_bi.bi_cf_ocs = spocs;
2639
2640         generic_filter.f_desc = slap_schema.si_ad_objectClass;
2641
2642         rc = config_register_schema( spcfg, spocs );
2643         if ( rc ) return rc;
2644
2645         return overlay_register( &syncprov );
2646 }
2647
2648 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
2649 int
2650 init_module( int argc, char *argv[] )
2651 {
2652         return syncprov_initialize();
2653 }
2654 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
2655
2656 #endif /* defined(SLAPD_OVER_SYNCPROV) */