server/seshigh.c

   1 /*
   2  * Copyright (C) 1994, Index Data I/S
   3  * All rights reserved.
   4  * Sebastian Hammer, Adam Dickmeiss
   5  *
   6  * $Log: seshigh.c,v $
   7  * Revision 1.20  1995-04-20 15:13:00  quinn
   8  * Cosmetic
   9  *
  10  * Revision 1.19  1995/04/18  08:15:34  quinn
  11  * Added dynamic memory allocation on encoding (whew). Code is now somewhat
  12  * neater. We'll make the same change for decoding one day.
  13  *
  14  * Revision 1.18  1995/04/17  11:28:25  quinn
  15  * Smallish
  16  *
  17  * Revision 1.17  1995/04/10  10:23:36  quinn
  18  * Some work to add scan and other things.
  19  *
  20  * Revision 1.16  1995/03/31  09:18:55  quinn
  21  * Added logging.
  22  *
  23  * Revision 1.15  1995/03/30  14:03:23  quinn
  24  * Added RFC1006 as separate library
  25  *
  26  * Revision 1.14  1995/03/30  12:18:17  quinn
  27  * Fixed bug.
  28  *
  29  * Revision 1.13  1995/03/30  09:09:24  quinn
  30  * Added state-handle and some support for asynchronous activities.
  31  *
  32  * Revision 1.12  1995/03/29  15:40:16  quinn
  33  * Ongoing work. Statserv is now dynamic by default
  34  *
  35  * Revision 1.11  1995/03/28  09:16:21  quinn
  36  * Added record packing to the search request
  37  *
  38  * Revision 1.10  1995/03/27  08:34:24  quinn
  39  * Added dynamic server functionality.
  40  * Released bindings to session.c (is now redundant)
  41  *
  42  * Revision 1.9  1995/03/22  15:01:26  quinn
  43  * Adjusting record packing.
  44  *
  45  * Revision 1.8  1995/03/22  10:13:21  quinn
  46  * Working on record packer
  47  *
  48  * Revision 1.7  1995/03/21  15:53:31  quinn
  49  * Little changes.
  50  *
  51  * Revision 1.6  1995/03/21  12:30:09  quinn
  52  * Beginning to add support for record packing.
  53  *
  54  * Revision 1.5  1995/03/17  10:44:13  quinn
  55  * Added catch of null-string in makediagrec
  56  *
  57  * Revision 1.4  1995/03/17  10:18:08  quinn
  58  * Added memory management.
  59  *
  60  * Revision 1.3  1995/03/16  17:42:39  quinn
  61  * Little changes
  62  *
  63  * Revision 1.2  1995/03/16  13:29:01  quinn
  64  * Partitioned server.
  65  *
  66  * Revision 1.1  1995/03/15  16:02:10  quinn
  67  * Modded session.c to seshigh.c
  68  *
  69  */
  70
  71 #include <stdlib.h>
  72 #include <stdio.h>
  73 #include <unistd.h>
  74 #include <assert.h>
  75
  76 #include <comstack.h>
  77 #include <eventl.h>
  78 #include <session.h>
  79 #include <proto.h>
  80 #include <oid.h>
  81 #include <log.h>
  82
  83 #include <backend.h>
  84
  85 #define MAXRECORDSIZE 1024*1024*5 /* should be configurable, of course */
  86
  87 static int process_apdu(IOCHAN chan);
  88 static int process_initRequest(IOCHAN client, Z_InitRequest *req);
  89 static int process_searchRequest(IOCHAN client, Z_SearchRequest *req);
  90 static int process_presentRequest(IOCHAN client, Z_PresentRequest *req);
  91 static int process_scanRequest(IOCHAN client, Z_ScanRequest *req);
  92
  93 extern int dynamic;
  94 extern char *apdufile;
  95
  96 static FILE *apduf = 0; /* for use in static mode */
  97
  98 /*
  99  * Create a new association-handle.
 100  *  channel  : iochannel for the current line.
 101  *  link     : communications channel.
 102  * Returns: 0 or a new association handle.
 103  */
 104 association *create_association(IOCHAN channel, COMSTACK link)
 105 {
 106     association *new;
 107
 108     if (!(new = malloc(sizeof(*new))))
 109         return 0;
 110     new->client_chan = channel;
 111     new->client_link = link;
 112     if (!(new->decode = odr_createmem(ODR_DECODE)) ||
 113         !(new->encode = odr_createmem(ODR_ENCODE)))
 114         return 0;
 115     if (apdufile)
 116     {
 117         char filename[256];
 118         FILE *f;
 119
 120         if (!(new->print = odr_createmem(ODR_PRINT)))
 121             return 0;
 122         if (*apdufile)
 123         {
 124             strcpy(filename, apdufile);
 125             if (!dynamic)
 126             {
 127                 if (!apduf)
 128                 {
 129                     if (!(apduf = fopen(filename, "w")))
 130                     {
 131                         logf(LOG_WARN|LOG_ERRNO, "%s", filename);
 132                         return 0;
 133                     }
 134                     setvbuf(apduf, 0, _IONBF, 0);
 135                 }
 136                 f = apduf;
 137             }
 138             else
 139             {
 140                 sprintf(filename + strlen(filename), ".%d", getpid());
 141                 if (!(f = fopen(filename, "w")))
 142                 {
 143                     logf(LOG_WARN|LOG_ERRNO, "%s", filename);
 144                     return 0;
 145                 }
 146                 setvbuf(f, 0, _IONBF, 0);
 147             }
 148             odr_setprint(new->print, f);
 149         }
 150     }
 151     else
 152         new->print = 0;
 153     new->input_buffer = 0;
 154     new->input_buffer_len = 0;
 155     new->backend = 0;
 156     if (cs_getproto(link) == CS_Z3950)
 157         new->proto = PROTO_Z3950;
 158     else
 159         new->proto = PROTO_SR;
 160     return new;
 161 }
 162
 163 /*
 164  * Free association and release resources.
 165  */
 166 void destroy_association(association *h)
 167 {
 168     odr_destroy(h->decode);
 169     odr_destroy(h->encode);
 170     if (h->print)
 171         odr_destroy(h->print);
 172     if (h->input_buffer)
 173         free(h->input_buffer);
 174     if (h->backend)
 175         bend_close(h->backend);
 176     free(h);
 177 }
 178
 179 /*
 180  * process events on the association. Called when the event loop detects an
 181  * event.
 182  *  h : the I/O channel that has an outstanding event.
 183  *  event : the current outstanding event.
 184  */
 185 void ir_session(IOCHAN h, int event)
 186 {
 187     int res;
 188     association *assoc = iochan_getdata(h);
 189     COMSTACK conn = assoc->client_link;
 190
 191     if (event == EVENT_INPUT)
 192     {
 193         assert(assoc && conn);
 194         res = cs_get(conn, &assoc->input_buffer, &assoc->input_buffer_len);
 195         switch (res)
 196         {
 197             case 0: case -1: /* connection closed by peer */
 198                 logf(LOG_LOG, "Connection closed by client");
 199                 cs_close(conn);
 200                 destroy_association(assoc);
 201                 iochan_destroy(h);
 202                 return;
 203             case 1:  /* incomplete read */
 204                 return;
 205             default: /* data! */
 206                 assoc->input_apdu_len = res;
 207                 if (process_apdu(h) < 0)
 208                 {
 209                     cs_close(conn);
 210                     destroy_association(assoc);
 211                     iochan_destroy(h);
 212                 }
 213                 else if (cs_more(conn)) /* arrange to be called again */
 214                     iochan_setevent(h, EVENT_INPUT);
 215         }
 216     }
 217     else if (event == EVENT_OUTPUT)
 218     {
 219         switch (res = cs_put(conn, assoc->encode_buffer, assoc->encoded_len))
 220         {
 221             case -1:
 222                 logf(LOG_LOG, "Connection closed by client");
 223                 cs_close(conn);
 224                 destroy_association(assoc);
 225                 iochan_destroy(h);
 226             case 0: /* all sent */
 227                 iochan_setflags(h, EVENT_INPUT | EVENT_EXCEPT); /* reset */
 228                 break;
 229             case 1: /* partial send */
 230                 break; /* we'll get called again */
 231         }
 232     }
 233     else if (event == EVENT_EXCEPT)
 234     {
 235         logf(LOG_LOG, "Exception on line");
 236         cs_close(conn);
 237         destroy_association(assoc);
 238         iochan_destroy(h);
 239     }
 240 }
 241
 242 /*
 243  * Process the current outstanding APDU.
 244  */
 245 static int process_apdu(IOCHAN chan)
 246 {
 247     Z_APDU *apdu;
 248     int res;
 249     association *assoc = iochan_getdata(chan);
 250
 251     odr_setbuf(assoc->decode, assoc->input_buffer, assoc->input_apdu_len);
 252     if (!z_APDU(assoc->decode, &apdu, 0))
 253     {
 254         logf(LOG_WARN, "ODR error: %s",
 255             odr_errlist[odr_geterror(assoc->decode)]);
 256         return -1;
 257     }
 258     if (assoc->print && !z_APDU(assoc->print, &apdu, 0))
 259     {
 260         logf(LOG_WARN, "ODR print error: %s",
 261             odr_errlist[odr_geterror(assoc->print)]);
 262         return -1;
 263     }
 264     switch (apdu->which)
 265     {
 266         case Z_APDU_initRequest:
 267             res = process_initRequest(chan, apdu->u.initRequest); break;
 268         case Z_APDU_searchRequest:
 269             res = process_searchRequest(chan, apdu->u.searchRequest); break;
 270         case Z_APDU_presentRequest:
 271             res = process_presentRequest(chan, apdu->u.presentRequest); break;
 272         case Z_APDU_scanRequest:
 273             res = process_scanRequest(chan, apdu->u.scanRequest); break;
 274         default:
 275             logf(LOG_WARN, "Bad APDU");
 276             return -1;
 277     }
 278     odr_reset(assoc->decode); /* release incoming APDU */
 279     odr_reset(assoc->encode); /* release stuff alloced before encoding */
 280     return res;
 281 }
 282
 283 static int process_initRequest(IOCHAN client, Z_InitRequest *req)
 284 {
 285     Z_APDU apdu, *apdup;
 286     Z_InitResponse resp;
 287     bool_t result = 1;
 288     association *assoc = iochan_getdata(client);
 289     bend_initrequest binitreq;
 290     bend_initresult *binitres;
 291     Odr_bitmask options, protocolVersion;
 292
 293     logf(LOG_LOG, "Got initRequest");
 294     if (req->implementationId)
 295         logf(LOG_LOG, "Id:        %s", req->implementationId);
 296     if (req->implementationName)
 297         logf(LOG_LOG, "Name:      %s", req->implementationName);
 298     if (req->implementationVersion)
 299         logf(LOG_LOG, "Version:   %s", req->implementationVersion);
 300
 301     binitreq.configname = "default-config";
 302     if (!(binitres = bend_init(&binitreq)) || binitres->errcode)
 303     {
 304         logf(LOG_WARN, "Negative response from backend");
 305         return -1;
 306     }
 307
 308     assoc->backend = binitres->handle;
 309     apdup = &apdu;
 310     apdu.which = Z_APDU_initResponse;
 311     apdu.u.initResponse = &resp;
 312     resp.referenceId = req->referenceId;
 313     ODR_MASK_ZERO(&options);
 314     if (ODR_MASK_GET(req->options, Z_Options_search))
 315         ODR_MASK_SET(&options, Z_Options_search);
 316     if (ODR_MASK_GET(req->options, Z_Options_present))
 317         ODR_MASK_SET(&options, Z_Options_present);
 318 #if 0
 319     if (ODR_MASK_GET(req->options, Z_Options_delSet))
 320         ODR_MASK_SET(&options, Z_Options_delSet);
 321 #endif
 322     if (ODR_MASK_GET(req->options, Z_Options_namedResultSets))
 323         ODR_MASK_SET(&options, Z_Options_namedResultSets);
 324     if (ODR_MASK_GET(req->options, Z_Options_scan))
 325         ODR_MASK_SET(&options, Z_Options_scan);
 326     resp.options = &options;
 327     ODR_MASK_ZERO(&protocolVersion);
 328     if (ODR_MASK_GET(req->protocolVersion, Z_ProtocolVersion_1))
 329         ODR_MASK_SET(&protocolVersion, Z_ProtocolVersion_1);
 330     if (ODR_MASK_GET(req->protocolVersion, Z_ProtocolVersion_2))
 331         ODR_MASK_SET(&protocolVersion, Z_ProtocolVersion_2);
 332     resp.protocolVersion = &protocolVersion;
 333     assoc->maximumRecordSize = *req->maximumRecordSize;
 334     if (assoc->maximumRecordSize > MAXRECORDSIZE)
 335         assoc->maximumRecordSize = MAXRECORDSIZE;
 336     assoc->preferredMessageSize = *req->preferredMessageSize;
 337     if (assoc->preferredMessageSize > assoc->maximumRecordSize)
 338         assoc->preferredMessageSize = assoc->maximumRecordSize;
 339     resp.preferredMessageSize = &assoc->preferredMessageSize;
 340     resp.maximumRecordSize = &assoc->maximumRecordSize;
 341     resp.result = &result;
 342     resp.implementationId = "YAZ";
 343     resp.implementationName = "Index Data/YAZ Generic Frontend Server";
 344     resp.implementationVersion = "$Revision: 1.20 $";
 345     resp.userInformationField = 0;
 346     if (!z_APDU(assoc->encode, &apdup, 0))
 347     {
 348         logf(LOG_FATAL, "ODR error encoding initres: %s",
 349             odr_errlist[odr_geterror(assoc->encode)]);
 350         return -1;
 351     }
 352     assoc->encode_buffer = odr_getbuf(assoc->encode, &assoc->encoded_len);
 353     odr_reset(assoc->encode);
 354     iochan_setflags(client, EVENT_OUTPUT | EVENT_EXCEPT);
 355     return 0;
 356 }
 357
 358 static Z_Records *diagrec(oid_proto proto, int error, char *addinfo)
 359 {
 360     static Z_Records rec;
 361     oident bib1;
 362     static Z_DiagRec dr;
 363     static int err;
 364
 365     bib1.proto = proto;
 366     bib1.class = CLASS_DIAGSET;
 367     bib1.value = VAL_BIB1;
 368
 369     logf(LOG_DEBUG, "Diagnostic: %d -- %s", error, addinfo ? addinfo :
 370         "NULL");
 371     err = error;
 372     rec.which = Z_Records_NSD;
 373     rec.u.nonSurrogateDiagnostic = &dr;
 374     dr.diagnosticSetId = oid_getoidbyent(&bib1);
 375     dr.condition = &err;
 376     dr.addinfo = addinfo ? addinfo : "";
 377     return &rec;
 378 }
 379
 380 static Z_NamePlusRecord *surrogatediagrec(oid_proto proto, char *dbname,
 381                                             int error, char *addinfo)
 382 {
 383     static Z_NamePlusRecord rec;
 384     static Z_DiagRec dr;
 385     static int err;
 386     oident bib1;
 387
 388     bib1.proto = proto;
 389     bib1.class = CLASS_DIAGSET;
 390     bib1.value = VAL_BIB1;
 391
 392     logf(LOG_DEBUG, "SurrogateDiagnotic: %d -- %s", error, addinfo);
 393     err = error;
 394     rec.databaseName = dbname;
 395     rec.which = Z_NamePlusRecord_surrogateDiagnostic;
 396     rec.u.surrogateDiagnostic = &dr;
 397     dr.diagnosticSetId = oid_getoidbyent(&bib1);
 398     dr.condition = &err;
 399     dr.addinfo = addinfo ? addinfo : "";
 400     return &rec;
 401 }
 402
 403 static Z_DiagRecs *diagrecs(oid_proto proto, int error, char *addinfo)
 404 {
 405     static Z_DiagRecs recs;
 406     static Z_DiagRec *recp[1], rec;
 407     static int err;
 408     oident bib1;
 409
 410     logf(LOG_DEBUG, "DiagRecs: %d -- %s", error, addinfo);
 411     bib1.proto = proto;
 412     bib1.class = CLASS_DIAGSET;
 413     bib1.value = VAL_BIB1;
 414
 415     err = error;
 416     recs.num_diagRecs = 1;
 417     recs.diagRecs = recp;
 418     recp[0] = &rec;
 419     rec.diagnosticSetId = oid_getoidbyent(&bib1);
 420     rec.condition = &err;
 421     rec.addinfo = addinfo ? addinfo : "";
 422     return &recs;
 423 }
 424
 425 #define MAX_RECORDS 256
 426
 427 static Z_Records *pack_records(association *a, char *setname, int start,
 428                                 int *num, Z_ElementSetNames *esn,
 429                                 int *next, int *pres)
 430 {
 431     int recno, total_length = 0, toget = *num;
 432     static Z_Records records;
 433     static Z_NamePlusRecordList reclist;
 434     static Z_NamePlusRecord *list[MAX_RECORDS];
 435     oident recform;
 436     Odr_oid *oid;
 437
 438     records.which = Z_Records_DBOSD;
 439     records.u.databaseOrSurDiagnostics = &reclist;
 440     reclist.num_records = 0;
 441     reclist.records = list;
 442     *pres = Z_PRES_SUCCESS;
 443     *num = 0;
 444     *next = 0;
 445
 446     recform.proto = a->proto;
 447     recform.class = CLASS_RECSYN;
 448     recform.value = VAL_USMARC;
 449     if (!(oid = odr_oiddup(a->encode, oid_getoidbyent(&recform))))
 450         return 0;
 451
 452     logf(LOG_DEBUG, "Request to pack %d+%d", start, toget);
 453     logf(LOG_DEBUG, "pms=%d, mrs=%d", a->preferredMessageSize,
 454         a->maximumRecordSize);
 455     for (recno = start; reclist.num_records < toget; recno++)
 456     {
 457         bend_fetchrequest freq;
 458         bend_fetchresult *fres;
 459         Z_NamePlusRecord *thisrec;
 460         Z_DatabaseRecord *thisext;
 461
 462         if (reclist.num_records == MAX_RECORDS - 1)
 463         {
 464             *pres = Z_PRES_PARTIAL_2;
 465             break;
 466         }
 467         freq.setname = setname;
 468         freq.number = recno;
 469         if (!(fres = bend_fetch(a->backend, &freq, 0)))
 470         {
 471             *pres = Z_PRES_FAILURE;
 472             return diagrec(a->proto, 2, "Backend interface problem");
 473         }
 474         /* backend should be able to signal whether error is system-wide
 475            or only pertaining to current record */
 476         if (fres->errcode)
 477         {
 478             *pres = Z_PRES_FAILURE;
 479             return diagrec(a->proto, fres->errcode, fres->errstring);
 480         }
 481         logf(LOG_DEBUG, "  fetched record, len=%d, total=%d",
 482             fres->len, total_length);
 483         if (fres->len + total_length > a->preferredMessageSize)
 484         {
 485             /* record is small enough, really */
 486             if (fres->len <= a->preferredMessageSize)
 487             {
 488                 logf(LOG_DEBUG, "  Dropped last normal-sized record");
 489                 *pres = Z_PRES_PARTIAL_2;
 490                 break;
 491             }
 492             /* record can only be fetched by itself */
 493             if (fres->len < a->maximumRecordSize)
 494             {
 495                 logf(LOG_DEBUG, "  Record > prefmsgsz");
 496                 if (toget > 1)
 497                 {
 498                     logf(LOG_DEBUG, "  Dropped it");
 499                     reclist.records[reclist.num_records] =
 500                          surrogatediagrec(a->proto, fres->basename, 16, 0);
 501                     reclist.num_records++;
 502                     *pres = Z_PRES_PARTIAL_2;
 503                     break;
 504                 }
 505             }
 506             else /* too big entirely */
 507             {
 508                 logf(LOG_DEBUG, "Record > maxrcdsz");
 509                 reclist.records[reclist.num_records] =
 510                     surrogatediagrec(a->proto, fres->basename, 17, 0);
 511                 reclist.num_records++;
 512                 *pres = Z_PRES_PARTIAL_2;
 513                 break;
 514             }
 515         }
 516         if (!(thisrec = odr_malloc(a->encode, sizeof(*thisrec))))
 517             return 0;
 518         if (!(thisrec->databaseName = odr_malloc(a->encode,
 519             strlen(fres->basename) + 1)))
 520             return 0;
 521         strcpy(thisrec->databaseName, fres->basename);
 522         thisrec->which = Z_NamePlusRecord_databaseRecord;
 523         if (!(thisrec->u.databaseRecord = thisext =  odr_malloc(a->encode,
 524             sizeof(Z_DatabaseRecord))))
 525             return 0;
 526         thisext->direct_reference = oid; /* should be OID for current MARC */
 527         thisext->indirect_reference = 0;
 528         thisext->descriptor = 0;
 529         thisext->which = ODR_EXTERNAL_octet;
 530         if (!(thisext->u.octet_aligned = odr_malloc(a->encode,
 531             sizeof(Odr_oct))))
 532             return 0;
 533         if (!(thisext->u.octet_aligned->buf = odr_malloc(a->encode, fres->len)))
 534             return 0;
 535         memcpy(thisext->u.octet_aligned->buf, fres->record, fres->len);
 536         thisext->u.octet_aligned->len = thisext->u.octet_aligned->size =
 537             fres->len;
 538         reclist.records[reclist.num_records] = thisrec;
 539         reclist.num_records++;
 540         total_length += fres->len;
 541         (*num)++;
 542         *next = fres->last_in_set ? 0 : recno + 1;
 543     }
 544     return &records;
 545 }
 546
 547 static int process_searchRequest(IOCHAN client, Z_SearchRequest *req)
 548 {
 549     Z_APDU apdu, *apdup;
 550     Z_SearchResponse resp;
 551     association *assoc = iochan_getdata(client);
 552     int nulint = 0;
 553     bool_t sr = 1;
 554     bend_searchrequest bsrq;
 555     bend_searchresult *bsrt;
 556     oident *oent;
 557     int next = 0;
 558     static int none = Z_RES_NONE;
 559
 560     logf(LOG_LOG, "Got SearchRequest.");
 561     apdup = &apdu;
 562     apdu.which = Z_APDU_searchResponse;
 563     apdu.u.searchResponse = &resp;
 564     resp.referenceId = req->referenceId;
 565
 566     resp.records = 0;
 567     if (req->query->which == Z_Query_type_1)
 568     {
 569         Z_RPNQuery *q = req->query->u.type_1;
 570
 571         if (!(oent = oid_getentbyoid(q->attributeSetId)) ||
 572             oent->class != CLASS_ATTSET ||
 573             oent->value != VAL_BIB1)
 574         {
 575             resp.records = diagrec(assoc->proto, 121, 0);
 576             resp.resultCount = &nulint;
 577             resp.numberOfRecordsReturned = &nulint;
 578             resp.nextResultSetPosition = &nulint;
 579             resp.searchStatus = &none;
 580             resp.resultSetStatus = 0;
 581             resp.presentStatus = 0;
 582         }
 583     }
 584     if (!resp.records)
 585     {
 586         int toget;
 587         Z_ElementSetNames *setnames;
 588         int presst = 0;
 589
 590         bsrq.setname = req->resultSetName;
 591         bsrq.replace_set = *req->replaceIndicator;
 592         bsrq.num_bases = req->num_databaseNames;
 593         bsrq.basenames = req->databaseNames;
 594         bsrq.query = req->query;
 595
 596         if (!(bsrt = bend_search(assoc->backend, &bsrq, 0)))
 597             return -1;
 598         else if (bsrt->errcode)
 599         {
 600
 601             resp.records = diagrec(assoc->proto, bsrt->errcode,
 602                 bsrt->errstring);
 603             resp.resultCount = &nulint;
 604             resp.numberOfRecordsReturned = &nulint;
 605             resp.nextResultSetPosition = &nulint;
 606             resp.searchStatus = &nulint;
 607             resp.resultSetStatus = &none;
 608             resp.presentStatus = 0;
 609         }
 610         else
 611         {
 612             resp.records = 0;
 613
 614             resp.resultCount = &bsrt->hits;
 615
 616             /* how many records does the user agent want, then? */
 617             if (bsrt->hits <= *req->smallSetUpperBound)
 618             {
 619                 toget = bsrt->hits;
 620                 setnames = req->smallSetElementSetNames;
 621             }
 622             else if (bsrt->hits < *req->largeSetLowerBound)
 623             {
 624                 toget = *req->mediumSetPresentNumber;
 625                 if (toget > bsrt->hits)
 626                     toget = bsrt->hits;
 627                 setnames = req->mediumSetElementSetNames;
 628             }
 629             else
 630                 toget = 0;
 631
 632             if (toget && !resp.records)
 633             {
 634                 resp.records = pack_records(assoc, req->resultSetName, 1,
 635                     &toget, setnames, &next, &presst);
 636                 if (!resp.records)
 637                     return -1;
 638                 resp.numberOfRecordsReturned = &toget;
 639                 resp.nextResultSetPosition = &next;
 640                 resp.searchStatus = &sr;
 641                 resp.resultSetStatus = 0;
 642                 resp.presentStatus = &presst;
 643             }
 644             else
 645             {
 646                 resp.numberOfRecordsReturned = &nulint;
 647                 resp.nextResultSetPosition = &next;
 648                 resp.searchStatus = &sr;
 649                 resp.resultSetStatus = 0;
 650                 resp.presentStatus = 0;
 651             }
 652         }
 653     }
 654
 655     if (!z_APDU(assoc->encode, &apdup, 0))
 656     {
 657         logf(LOG_FATAL, "ODR error encoding searchres: %s",
 658             odr_errlist[odr_geterror(assoc->encode)]);
 659         return -1;
 660     }
 661     assoc->encode_buffer = odr_getbuf(assoc->encode, &assoc->encoded_len);
 662     odr_reset(assoc->encode);
 663     iochan_setflags(client, EVENT_OUTPUT | EVENT_EXCEPT);
 664     return 0;
 665 }
 666
 667 static int process_presentRequest(IOCHAN client, Z_PresentRequest *req)
 668 {
 669     Z_APDU apdu, *apdup;
 670     Z_PresentResponse resp;
 671     association *assoc = iochan_getdata(client);
 672     int presst, next, num;
 673
 674     logf(LOG_LOG, "Got PresentRequest.");
 675     apdup = &apdu;
 676     apdu.which = Z_APDU_presentResponse;
 677     apdu.u.presentResponse = &resp;
 678     resp.referenceId = req->referenceId;
 679
 680     num = *req->numberOfRecordsRequested;
 681     resp.records = pack_records(assoc, req->resultSetId,
 682         *req->resultSetStartPoint, &num, req->elementSetNames, &next, &presst);
 683     if (!resp.records)
 684         return -1;
 685     resp.numberOfRecordsReturned = &num;
 686     resp.presentStatus = &presst;
 687     resp.nextResultSetPosition = &next;
 688
 689     if (!z_APDU(assoc->encode, &apdup, 0))
 690     {
 691         logf(LOG_FATAL, "ODR error encoding initres: %s",
 692             odr_errlist[odr_geterror(assoc->encode)]);
 693         return -1;
 694     }
 695     assoc->encode_buffer = odr_getbuf(assoc->encode, &assoc->encoded_len);
 696     odr_reset(assoc->encode);
 697     iochan_setflags(client, EVENT_OUTPUT | EVENT_EXCEPT);
 698     return 0;
 699 }
 700
 701 static int process_scanRequest(IOCHAN client, Z_ScanRequest *req)
 702 {
 703     association *assoc = iochan_getdata(client);
 704     Z_APDU apdu, *apdup;
 705     Z_ScanResponse res;
 706     bend_scanrequest srq;
 707     bend_scanresult *srs;
 708     int scanStatus = Z_Scan_failure;
 709     int numberOfEntriesReturned = 0;
 710     oident *attent;
 711     Z_ListEntries ents;
 712 #define SCAN_MAX_ENTRIES 200
 713     Z_Entry *tab[SCAN_MAX_ENTRIES];
 714
 715     apdup = &apdu;
 716     apdu.which = Z_APDU_scanResponse;
 717     apdu.u.scanResponse = &res;
 718     res.referenceId = req->referenceId;
 719     res.stepSize = 0;
 720     res.scanStatus = &scanStatus;
 721     res.numberOfEntriesReturned = &numberOfEntriesReturned;
 722     res.positionOfTerm = 0;
 723     res.entries = &ents;
 724     ents.which = Z_ListEntries_nonSurrogateDiagnostics;
 725     res.attributeSet = 0;
 726
 727     if (req->attributeSet && (!(attent = oid_getentbyoid(req->attributeSet)) ||
 728         attent->class != CLASS_ATTSET || attent->value != VAL_BIB1))
 729         ents.u.nonSurrogateDiagnostics = diagrecs(assoc->proto, 121, 0);
 730     else if (req->stepSize && *req->stepSize > 0)
 731         ents.u.nonSurrogateDiagnostics = diagrecs(assoc->proto, 205, 0);
 732     else
 733     {
 734         srq.num_bases = req->num_databaseNames;
 735         srq.basenames = req->databaseNames;
 736         srq.num_entries = *req->numberOfTermsRequested;
 737         srq.term = req->termListAndStartPoint;
 738         srq.term_position = req->preferredPositionInResponse ?
 739             *req->preferredPositionInResponse : 1;
 740         if (!(srs = bend_scan(assoc->backend, &srq, 0)))
 741             ents.u.nonSurrogateDiagnostics = diagrecs(assoc->proto, 2, 0);
 742         else if (srs->errcode)
 743             ents.u.nonSurrogateDiagnostics = diagrecs(assoc->proto,
 744                 srs->errcode, srs->errstring);
 745         else
 746         {
 747             int i;
 748             static Z_Entries list;
 749
 750             if (srs->status == BEND_SCAN_PARTIAL)
 751                 scanStatus = Z_Scan_partial_5;
 752             else
 753                 scanStatus = Z_Scan_success;
 754             ents.which = Z_ListEntries_entries;
 755             ents.u.entries = &list;
 756             list.entries = tab;
 757             for (i = 0; i < srs->num_entries; i++)
 758             {
 759                 Z_Entry *e;
 760                 Z_TermInfo *t;
 761                 Odr_oct *o;
 762
 763                 if (i >= SCAN_MAX_ENTRIES)
 764                 {
 765                     scanStatus = Z_Scan_partial_4;
 766                     break;
 767                 }
 768                 list.entries[i] = e = odr_malloc(assoc->encode, sizeof(*e));
 769                 e->which = Z_Entry_termInfo;
 770                 e->u.termInfo = t = odr_malloc(assoc->encode, sizeof(*t));
 771                 t->suggestedAttributes = 0;
 772                 t->alternativeTerm = 0;
 773                 t->byAttributes = 0;
 774                 t->globalOccurrences = &srs->entries[i].occurrences;
 775                 t->term = odr_malloc(assoc->encode, sizeof(*t->term));
 776                 t->term->which = Z_Term_general;
 777                 t->term->u.general = o = odr_malloc(assoc->encode,
 778                     sizeof(Odr_oct));
 779                 o->buf = odr_malloc(assoc->encode, o->len = o->size =
 780                     strlen(srs->entries[i].term));
 781                 memcpy(o->buf, srs->entries[i].term, o->len);
 782             }
 783             list.num_entries = i;
 784             res.numberOfEntriesReturned = &list.num_entries;
 785             res.positionOfTerm = &srs->term_position;
 786         }
 787     }
 788     if (!z_APDU(assoc->encode, &apdup, 0))
 789     {
 790         logf(LOG_FATAL, "ODR error encoding initres: %s",
 791             odr_errlist[odr_geterror(assoc->encode)]);
 792         return -1;
 793     }
 794     assoc->encode_buffer = odr_getbuf(assoc->encode, &assoc->encoded_len);
 795     odr_reset(assoc->encode);
 796     iochan_setflags(client, EVENT_OUTPUT | EVENT_EXCEPT);
 797     return 0;
 798 }