server/seshigh.c

   1 /*
   2  * Copyright (c) 1995, Index Data
   3  * See the file LICENSE for details.
   4  * Sebastian Hammer, Adam Dickmeiss
   5  *
   6  * $Log: seshigh.c,v $
   7  * Revision 1.61  1996-06-10 08:56:16  quinn
   8  * Work on Summary.
   9  *
  10  * Revision 1.60  1996/05/30  11:03:10  quinn
  11  * Fixed NextresultSetPosition bug fixed.
  12  *
  13  * Revision 1.59  1996/05/14  09:26:46  quinn
  14  * Added attribute set to scan backend
  15  *
  16  * Revision 1.58  1996/02/20  12:53:04  quinn
  17  * Chanes to SCAN
  18  *
  19  * Revision 1.57  1996/01/02  08:57:47  quinn
  20  * Changed enums in the ASN.1 .h files to #defines. Changed oident.class to oclass
  21  *
  22  * Revision 1.56  1995/12/14  11:09:57  quinn
  23  * Work on Explain
  24  *
  25  * Revision 1.55  1995/11/08  17:41:37  quinn
  26  * Smallish.
  27  *
  28  * Revision 1.54  1995/11/08  15:11:29  quinn
  29  * Log of close transmit.
  30  *
  31  * Revision 1.53  1995/11/01  13:54:58  quinn
  32  * Minor adjustments
  33  *
  34  * Revision 1.52  1995/11/01  12:19:13  quinn
  35  * Second attempt to fix same bug.
  36  *
  37  * Revision 1.50  1995/10/25  16:58:32  quinn
  38  * Simple.
  39  *
  40  * Revision 1.49  1995/10/16  13:51:53  quinn
  41  * Changes to provide Especs to the backend.
  42  *
  43  * Revision 1.48  1995/10/06  08:51:20  quinn
  44  * Added Write-buffer.
  45  *
  46  * Revision 1.47  1995/08/29  14:24:16  quinn
  47  * Added second half of close-handshake
  48  *
  49  * Revision 1.46  1995/08/29  11:17:58  quinn
  50  * Added code to receive close
  51  *
  52  * Revision 1.45  1995/08/21  09:11:00  quinn
  53  * Smallish fixes to suppport new formats.
  54  *
  55  * Revision 1.44  1995/08/17  12:45:25  quinn
  56  * Fixed minor problems with GRS-1. Added support in c&s.
  57  *
  58  * Revision 1.43  1995/08/15  12:00:31  quinn
  59  * Updated External
  60  *
  61  * Revision 1.42  1995/08/15  11:16:50  quinn
  62  *
  63  * Revision 1.41  1995/08/02  10:23:06  quinn
  64  * Smallish
  65  *
  66  * Revision 1.40  1995/07/31  14:34:26  quinn
  67  * Fixed bug in process_searchResponse (numberOfRecordsReturned).
  68  *
  69  * Revision 1.39  1995/06/27  13:21:00  quinn
  70  * SUTRS support
  71  *
  72  * Revision 1.38  1995/06/19  12:39:11  quinn
  73  * Fixed bug in timeout code. Added BER dumper.
  74  *
  75  * Revision 1.37  1995/06/16  13:16:14  quinn
  76  * Fixed Defaultdiagformat.
  77  *
  78  * Revision 1.36  1995/06/16  10:31:36  quinn
  79  * Added session timeout.
  80  *
  81  * Revision 1.35  1995/06/15  07:45:14  quinn
  82  * Moving to v3.
  83  *
  84  * Revision 1.34  1995/06/14  15:26:46  quinn
  85  * *** empty log message ***
  86  *
  87  * Revision 1.33  1995/06/06  14:57:05  quinn
  88  * Better diagnostics.
  89  *
  90  * Revision 1.32  1995/06/06  08:41:44  quinn
  91  * Better diagnostics.
  92  *
  93  * Revision 1.31  1995/06/06  08:15:37  quinn
  94  * Cosmetic.
  95  *
  96  * Revision 1.30  1995/06/05  10:53:32  quinn
  97  * Added a better SCAN.
  98  *
  99  * Revision 1.29  1995/06/01  11:25:03  quinn
 100  * Smallish.
 101  *
 102  * Revision 1.28  1995/06/01  11:21:01  quinn
 103  * Attempting to fix a bug in pack-records. replaced break with continue
 104  * for large records, according to standard.
 105  *
 106  * Revision 1.27  1995/05/29  08:12:06  quinn
 107  * Moved oid to util
 108  *
 109  * Revision 1.26  1995/05/18  13:02:12  quinn
 110  * Smallish.
 111  *
 112  * Revision 1.25  1995/05/17  08:42:26  quinn
 113  * Transfer auth info to backend. Allow backend to reject init gracefully.
 114  *
 115  * Revision 1.24  1995/05/16  08:51:04  quinn
 116  * License, documentation, and memory fixes
 117  *
 118  * Revision 1.23  1995/05/15  13:25:10  quinn
 119  * Fixed memory bug.
 120  *
 121  * Revision 1.22  1995/05/15  11:56:39  quinn
 122  * Asynchronous facilities. Restructuring of seshigh code.
 123  *
 124  * Revision 1.21  1995/05/02  08:53:19  quinn
 125  * Trying in vain to fix comm with ISODE
 126  *
 127  * Revision 1.20  1995/04/20  15:13:00  quinn
 128  * Cosmetic
 129  *
 130  * Revision 1.19  1995/04/18  08:15:34  quinn
 131  * Added dynamic memory allocation on encoding (whew). Code is now somewhat
 132  * neater. We'll make the same change for decoding one day.
 133  *
 134  * Revision 1.18  1995/04/17  11:28:25  quinn
 135  * Smallish
 136  *
 137  * Revision 1.17  1995/04/10  10:23:36  quinn
 138  * Some work to add scan and other things.
 139  *
 140  * Revision 1.16  1995/03/31  09:18:55  quinn
 141  * Added logging.
 142  *
 143  * Revision 1.15  1995/03/30  14:03:23  quinn
 144  * Added RFC1006 as separate library
 145  *
 146  * Revision 1.14  1995/03/30  12:18:17  quinn
 147  * Fixed bug.
 148  *
 149  * Revision 1.13  1995/03/30  09:09:24  quinn
 150  * Added state-handle and some support for asynchronous activities.
 151  *
 152  * Revision 1.12  1995/03/29  15:40:16  quinn
 153  * Ongoing work. Statserv is now dynamic by default
 154  *
 155  * Revision 1.11  1995/03/28  09:16:21  quinn
 156  * Added record packing to the search request
 157  *
 158  * Revision 1.10  1995/03/27  08:34:24  quinn
 159  * Added dynamic server functionality.
 160  * Released bindings to session.c (is now redundant)
 161  *
 162  * Revision 1.9  1995/03/22  15:01:26  quinn
 163  * Adjusting record packing.
 164  *
 165  * Revision 1.8  1995/03/22  10:13:21  quinn
 166  * Working on record packer
 167  *
 168  * Revision 1.7  1995/03/21  15:53:31  quinn
 169  * Little changes.
 170  *
 171  * Revision 1.6  1995/03/21  12:30:09  quinn
 172  * Beginning to add support for record packing.
 173  *
 174  * Revision 1.5  1995/03/17  10:44:13  quinn
 175  * Added catch of null-string in makediagrec
 176  *
 177  * Revision 1.4  1995/03/17  10:18:08  quinn
 178  * Added memory management.
 179  *
 180  * Revision 1.3  1995/03/16  17:42:39  quinn
 181  * Little changes
 182  *
 183  * Revision 1.2  1995/03/16  13:29:01  quinn
 184  * Partitioned server.
 185  *
 186  * Revision 1.1  1995/03/15  16:02:10  quinn
 187  * Modded session.c to seshigh.c
 188  *
 189  */
 190
 191 /*
 192  * Frontend server logic.
 193  *
 194  * This code receives incoming APDUs, and handles client requests by means
 195  * of the backend API.
 196  *
 197  * Some of the code is getting quite involved, compared to simpler servers -
 198  * primarily because it is asynchronous both in the communication with
 199  * the user and the backend. We think the complexity will pay off in
 200  * the form of greater flexibility when more asynchronous facilities
 201  * are implemented.
 202  *
 203  * Memory management has become somewhat involved. In the simple case, where
 204  * only one PDU is pending at a time, it will simply reuse the same memory,
 205  * once it has found its working size. When we enable multiple concurrent
 206  * operations, perhaps even with multiple parallel calls to the backend, it
 207  * will maintain a pool of buffers for encoding and decoding, trying to
 208  * minimize memory allocation/deallocation during normal operation.
 209  *
 210  * TODOs include (and will be done in order of public interest):
 211  *
 212  * Support for EXPLAIN - provide simple meta-database system.
 213  * Support for access control.
 214  * Support for resource control.
 215  * Support for extended services - primarily Item Order.
 216  * Rest of Z39.50-1994
 217  *
 218  */
 219
 220 #include <stdlib.h>
 221 #include <stdio.h>
 222 #include <unistd.h>
 223 #include <assert.h>
 224 #include <sys/time.h>
 225
 226 #include <xmalloc.h>
 227 #include <comstack.h>
 228 #include <eventl.h>
 229 #include <session.h>
 230 #include <proto.h>
 231 #include <oid.h>
 232 #include <log.h>
 233 #include <statserv.h>
 234
 235 #include <backend.h>
 236
 237 static int process_request(association *assoc);
 238 void backend_response(IOCHAN i, int event);
 239 static int process_response(association *assoc, request *req, Z_APDU *res);
 240 static Z_APDU *process_initRequest(association *assoc, request *reqb);
 241 static Z_APDU *process_searchRequest(association *assoc, request *reqb,
 242     int *fd);
 243 static Z_APDU *response_searchRequest(association *assoc, request *reqb,
 244     bend_searchresult *bsrt, int *fd);
 245 static Z_APDU *process_presentRequest(association *assoc, request *reqb,
 246     int *fd);
 247 static Z_APDU *process_scanRequest(association *assoc, request *reqb, int *fd);
 248 static void process_close(association *assoc, request *reqb);
 249
 250 static FILE *apduf = 0; /* for use in static mode */
 251 static statserv_options_block *control_block = 0;
 252
 253 /*
 254  * Create and initialize a new association-handle.
 255  *  channel  : iochannel for the current line.
 256  *  link     : communications channel.
 257  * Returns: 0 or a new association handle.
 258  */
 259 association *create_association(IOCHAN channel, COMSTACK link)
 260 {
 261     association *new;
 262
 263     if (!control_block)
 264         control_block = statserv_getcontrol();
 265     if (!(new = xmalloc(sizeof(*new))))
 266         return 0;
 267     new->client_chan = channel;
 268     new->client_link = link;
 269     if (!(new->decode = odr_createmem(ODR_DECODE)) ||
 270         !(new->encode = odr_createmem(ODR_ENCODE)))
 271         return 0;
 272     if (*control_block->apdufile)
 273     {
 274         char filename[256];
 275         FILE *f;
 276
 277         strcpy(filename, control_block->apdufile);
 278         if (!(new->print = odr_createmem(ODR_PRINT)))
 279             return 0;
 280         if (*control_block->apdufile != '-')
 281         {
 282             strcpy(filename, control_block->apdufile);
 283             if (!control_block->dynamic)
 284             {
 285                 if (!apduf)
 286                 {
 287                     if (!(apduf = fopen(filename, "w")))
 288                     {
 289                         logf(LOG_WARN|LOG_ERRNO, "%s", filename);
 290                         return 0;
 291                     }
 292                     setvbuf(apduf, 0, _IONBF, 0);
 293                 }
 294                 f = apduf;
 295             }
 296             else
 297             {
 298                 sprintf(filename + strlen(filename), ".%d", getpid());
 299                 if (!(f = fopen(filename, "w")))
 300                 {
 301                     logf(LOG_WARN|LOG_ERRNO, "%s", filename);
 302                     return 0;
 303                 }
 304                 setvbuf(f, 0, _IONBF, 0);
 305             }
 306             odr_setprint(new->print, f);
 307         }
 308     }
 309     else
 310         new->print = 0;
 311     new->input_buffer = 0;
 312     new->input_buffer_len = 0;
 313     new->backend = 0;
 314     new->state = ASSOC_NEW;
 315     request_initq(&new->incoming);
 316     request_initq(&new->outgoing);
 317     new->proto = cs_getproto(link);
 318     return new;
 319 }
 320
 321 /*
 322  * Free association and release resources.
 323  */
 324 void destroy_association(association *h)
 325 {
 326     odr_destroy(h->decode);
 327     odr_destroy(h->encode);
 328     if (h->print)
 329         odr_destroy(h->print);
 330     if (h->input_buffer)
 331     xfree(h->input_buffer);
 332     if (h->backend)
 333         bend_close(h->backend);
 334     while (request_deq(&h->incoming));
 335     while (request_deq(&h->outgoing));
 336    xfree(h);
 337 }
 338
 339 static void do_close(association *a, int reason, char *message)
 340 {
 341     Z_APDU apdu;
 342     Z_Close *cls = zget_Close(a->encode);
 343     request *req = request_get();
 344
 345     /* Purge request queue */
 346     while (request_deq(&a->incoming));
 347     while (request_deq(&a->outgoing));
 348     if (a->version >= 3)
 349     {
 350         logf(LOG_LOG, "Sending Close PDU, reason=%d, message=%s",
 351             reason, message ? message : "none");
 352         apdu.which = Z_APDU_close;
 353         apdu.u.close = cls;
 354         *cls->closeReason = reason;
 355         cls->diagnosticInformation = message;
 356         process_response(a, req, &apdu);
 357         iochan_settimeout(a->client_chan, 60);
 358     }
 359     else
 360     {
 361         logf(LOG_DEBUG, "v2 client. No Close PDU");
 362         iochan_setevent(a->client_chan, EVENT_TIMEOUT); /* force imm close */
 363     }
 364     a->state = ASSOC_DEAD;
 365 }
 366
 367 /*
 368  * This is where PDUs from the client are read and the further
 369  * processing is initiated. Flow of control moves down through the
 370  * various process_* functions below, until the encoded result comes back up
 371  * to the output handler in here.
 372  *
 373  *  h     : the I/O channel that has an outstanding event.
 374  *  event : the current outstanding event.
 375  */
 376 void ir_session(IOCHAN h, int event)
 377 {
 378     int res;
 379     association *assoc = iochan_getdata(h);
 380     COMSTACK conn = assoc->client_link;
 381     request *req;
 382
 383     assert(h && conn && assoc);
 384     if (event == EVENT_TIMEOUT)
 385     {
 386         if (assoc->state != ASSOC_UP)
 387         {
 388             logf(LOG_LOG, "Final timeout - closing connection.");
 389             cs_close(conn);
 390             destroy_association(assoc);
 391             iochan_destroy(h);
 392         }
 393         else
 394         {
 395             logf(LOG_LOG, "Session idle too long. Sending close.");
 396             do_close(assoc, Z_Close_lackOfActivity, 0);
 397         }
 398         return;
 399     }
 400     if (event & EVENT_INPUT || event & EVENT_WORK) /* input */
 401     {
 402         if (event & EVENT_INPUT)
 403         {
 404             logf(LOG_DEBUG, "ir_session (input)");
 405             assert(assoc && conn);
 406             /* We aren't speaking to this fellow */
 407             if (assoc->state == ASSOC_DEAD)
 408             {
 409                 logf(LOG_LOG, "Closed connection after reject");
 410                 cs_close(conn);
 411                 destroy_association(assoc);
 412                 iochan_destroy(h);
 413                 return;
 414             }
 415             if ((res = cs_get(conn, &assoc->input_buffer,
 416                 &assoc->input_buffer_len)) <= 0)
 417             {
 418                 logf(LOG_LOG, "Connection closed by client");
 419                 cs_close(conn);
 420                 destroy_association(assoc);
 421                 iochan_destroy(h);
 422                 return;
 423             }
 424             else if (res == 1) /* incomplete read - wait for more  */
 425                 return;
 426             if (cs_more(conn)) /* more stuff - call us again later, please */
 427                 iochan_setevent(h, EVENT_INPUT);
 428
 429             /* we got a complete PDU. Let's decode it */
 430             logf(LOG_DEBUG, "Got PDU, %d bytes", res);
 431             req = request_get(); /* get a new request structure */
 432             odr_reset(assoc->decode);
 433             odr_setbuf(assoc->decode, assoc->input_buffer, res, 0);
 434             if (!z_APDU(assoc->decode, &req->request, 0))
 435             {
 436                 logf(LOG_LOG, "ODR error on incoming PDU: %s [near byte %d] ",
 437                     odr_errlist[odr_geterror(assoc->decode)],
 438                     odr_offset(assoc->decode));
 439                 logf(LOG_LOG, "PDU dump:");
 440                 odr_dumpBER(log_file(), assoc->input_buffer, res);
 441                 do_close(assoc, Z_Close_protocolError, "Malformed package");
 442                 return;
 443             }
 444             req->request_mem = odr_extract_mem(assoc->decode);
 445             if (assoc->print && !z_APDU(assoc->print, &req->request, 0))
 446             {
 447                 logf(LOG_WARN, "ODR print error: %s",
 448                     odr_errlist[odr_geterror(assoc->print)]);
 449                 odr_reset(assoc->print);
 450             }
 451             request_enq(&assoc->incoming, req);
 452         }
 453
 454         /* can we do something yet? */
 455         req = request_head(&assoc->incoming);
 456         if (req->state == REQUEST_IDLE)
 457             if (process_request(assoc) < 0)
 458                 do_close(assoc, Z_Close_systemProblem, "Unknown error");
 459     }
 460     if (event & EVENT_OUTPUT)
 461     {
 462         request *req = request_head(&assoc->outgoing);
 463
 464         logf(LOG_DEBUG, "ir_session (output)");
 465         req->state = REQUEST_PENDING;
 466         switch (res = cs_put(conn, req->response, req->len_response))
 467         {
 468             case -1:
 469                 logf(LOG_LOG, "Connection closed by client");
 470                 cs_close(conn);
 471                 destroy_association(assoc);
 472                 iochan_destroy(h);
 473                 break;
 474             case 0: /* all sent - release the request structure */
 475                 logf(LOG_DEBUG, "Wrote PDU, %d bytes", req->len_response);
 476                 nmem_destroy(req->request_mem);
 477                 request_deq(&assoc->outgoing);
 478                 request_release(req);
 479                 if (!request_head(&assoc->outgoing))
 480                     iochan_clearflag(h, EVENT_OUTPUT);
 481                 break;
 482             /* value of 1 -- partial send -- is simply ignored */
 483         }
 484     }
 485     if (event & EVENT_EXCEPT)
 486     {
 487         logf(LOG_DEBUG, "ir_session (exception)");
 488         cs_close(conn);
 489         destroy_association(assoc);
 490         iochan_destroy(h);
 491     }
 492 }
 493
 494 /*
 495  * Initiate request processing.
 496  */
 497 static int process_request(association *assoc)
 498 {
 499     request *req = request_head(&assoc->incoming);
 500     int fd = -1;
 501     Z_APDU *res;
 502
 503     logf(LOG_DEBUG, "process_request");
 504     assert(req && req->state == REQUEST_IDLE);
 505     switch (req->request->which)
 506     {
 507         case Z_APDU_initRequest:
 508             res = process_initRequest(assoc, req); break;
 509         case Z_APDU_searchRequest:
 510             res = process_searchRequest(assoc, req, &fd); break;
 511         case Z_APDU_presentRequest:
 512             res = process_presentRequest(assoc, req, &fd); break;
 513         case Z_APDU_scanRequest:
 514             res = process_scanRequest(assoc, req, &fd); break;
 515         case Z_APDU_close:
 516             process_close(assoc, req); return 0;
 517         default:
 518             logf(LOG_WARN, "Bad APDU received");
 519             return -1;
 520     }
 521     if (res)
 522     {
 523         logf(LOG_DEBUG, "  result immediately available");
 524         return process_response(assoc, req, res);
 525     }
 526     else if (fd < 0)
 527     {
 528         logf(LOG_WARN, "   bad result");
 529         return -1;
 530     }
 531     else /* no result yet - one will be provided later */
 532     {
 533         IOCHAN chan;
 534
 535         /* Set up an I/O handler for the fd supplied by the backend */
 536
 537         logf(LOG_DEBUG, "   establishing handler for result");
 538         req->state = REQUEST_PENDING;
 539         if (!(chan = iochan_create(fd, backend_response, EVENT_INPUT)))
 540             abort();
 541         iochan_setdata(chan, assoc);
 542         return 0;
 543     }
 544 }
 545
 546 /*
 547  * Handle message from the backend.
 548  */
 549 void backend_response(IOCHAN i, int event)
 550 {
 551     association *assoc = iochan_getdata(i);
 552     request *req = request_head(&assoc->incoming);
 553     Z_APDU *res;
 554     int fd;
 555
 556     logf(LOG_DEBUG, "backend_response");
 557     assert(assoc && req && req->state != REQUEST_IDLE);
 558     /* determine what it is we're waiting for */
 559     switch (req->request->which)
 560     {
 561         case Z_APDU_searchRequest:
 562             res = response_searchRequest(assoc, req, 0, &fd); break;
 563 #if 0
 564         case Z_APDU_presentRequest:
 565             res = response_presentRequest(assoc, req, 0, &fd); break;
 566         case Z_APDU_scanRequest:
 567             res = response_scanRequest(assoc, req, 0, &fd); break;
 568 #endif
 569         default:
 570             logf(LOG_WARN, "Serious programmer's lapse or bug");
 571             abort();
 572     }
 573     if ((res && process_response(assoc, req, res) < 0) || fd < 0)
 574     {
 575         logf(LOG_LOG, "Fatal error when talking to backend");
 576         do_close(assoc, Z_Close_systemProblem, 0);
 577         iochan_destroy(i);
 578         return;
 579     }
 580     else if (!res) /* no result yet - try again later */
 581     {
 582         logf(LOG_DEBUG, "   no result yet");
 583         iochan_setfd(i, fd); /* in case fd has changed */
 584     }
 585 }
 586
 587 /*
 588  * Encode response, and transfer the request structure to the outgoing queue.
 589  */
 590 static int process_response(association *assoc, request *req, Z_APDU *res)
 591 {
 592     odr_setbuf(assoc->encode, req->response, req->size_response, 1);
 593     if (!z_APDU(assoc->encode, &res, 0))
 594     {
 595         logf(LOG_WARN, "ODR error when encoding response: %s",
 596             odr_errlist[odr_geterror(assoc->decode)]);
 597         odr_reset(assoc->encode);
 598         return -1;
 599     }
 600     req->response = odr_getbuf(assoc->encode, &req->len_response,
 601         &req->size_response);
 602     odr_setbuf(assoc->encode, 0, 0, 0); /* don'txfree if we abort later */
 603     odr_reset(assoc->encode);
 604     if (assoc->print && !z_APDU(assoc->print, &res, 0))
 605     {
 606         logf(LOG_WARN, "ODR print error: %s",
 607             odr_errlist[odr_geterror(assoc->print)]);
 608         odr_reset(assoc->print);
 609     }
 610     /* change this when we make the backend reentrant */
 611     if (req == request_head(&assoc->incoming))
 612     {
 613         req->state = REQUEST_IDLE;
 614         request_deq(&assoc->incoming);
 615     }
 616     request_enq(&assoc->outgoing, req);
 617     /* turn the work over to the ir_session handler */
 618     iochan_setflag(assoc->client_chan, EVENT_OUTPUT);
 619     /* Is there more work to be done? give that to the input handler too */
 620     if (request_head(&assoc->incoming))
 621         iochan_setevent(assoc->client_chan, EVENT_WORK);
 622     return 0;
 623 }
 624
 625 /*
 626  * Handle init request.
 627  * At the moment, we don't check the options
 628  * anywhere else in the code - we just try not to do anything that would
 629  * break a naive client. We'll toss 'em into the association block when
 630  * we need them there.
 631  */
 632 static Z_APDU *process_initRequest(association *assoc, request *reqb)
 633 {
 634     Z_InitRequest *req = reqb->request->u.initRequest;
 635     Z_APDU *apdu = zget_APDU(assoc->encode, Z_APDU_initResponse);
 636     Z_InitResponse *resp = apdu->u.initResponse;
 637     bend_initrequest binitreq;
 638     bend_initresult *binitres;
 639     char options[100];
 640
 641     logf(LOG_LOG, "Got initRequest");
 642     if (req->implementationId)
 643         logf(LOG_LOG, "Id:        %s", req->implementationId);
 644     if (req->implementationName)
 645         logf(LOG_LOG, "Name:      %s", req->implementationName);
 646     if (req->implementationVersion)
 647         logf(LOG_LOG, "Version:   %s", req->implementationVersion);
 648
 649     binitreq.configname = "default-config";
 650     binitreq.auth = req->idAuthentication;
 651     if (!(binitres = bend_init(&binitreq)))
 652     {
 653         logf(LOG_WARN, "Bad response from backend.");
 654         return 0;
 655     }
 656
 657     assoc->backend = binitres->handle;
 658     resp->referenceId = req->referenceId;
 659     *options = '\0';
 660     /* let's tell the client what we can do */
 661     if (ODR_MASK_GET(req->options, Z_Options_search))
 662     {
 663         ODR_MASK_SET(resp->options, Z_Options_search);
 664         strcat(options, "srch");
 665     }
 666     if (ODR_MASK_GET(req->options, Z_Options_present))
 667     {
 668         ODR_MASK_SET(resp->options, Z_Options_present);
 669         strcat(options, " prst");
 670     }
 671 #if 0
 672     if (ODR_MASK_GET(req->options, Z_Options_delSet))
 673     {
 674         ODR_MASK_SET(&options, Z_Options_delSet);
 675         strcat(options, " del");
 676     }
 677 #endif
 678     if (ODR_MASK_GET(req->options, Z_Options_namedResultSets))
 679     {
 680         ODR_MASK_SET(resp->options, Z_Options_namedResultSets);
 681         strcat(options, " namedresults");
 682     }
 683     if (ODR_MASK_GET(req->options, Z_Options_scan))
 684     {
 685         ODR_MASK_SET(resp->options, Z_Options_scan);
 686         strcat(options, " scan");
 687     }
 688     if (ODR_MASK_GET(req->options, Z_Options_concurrentOperations))
 689     {
 690         ODR_MASK_SET(resp->options, Z_Options_concurrentOperations);
 691         strcat(options, " concurop");
 692     }
 693
 694     if (ODR_MASK_GET(req->protocolVersion, Z_ProtocolVersion_1))
 695     {
 696         ODR_MASK_SET(resp->protocolVersion, Z_ProtocolVersion_1);
 697         assoc->version = 2; /* 1 & 2 are equivalent */
 698     }
 699     if (ODR_MASK_GET(req->protocolVersion, Z_ProtocolVersion_2))
 700     {
 701         ODR_MASK_SET(resp->protocolVersion, Z_ProtocolVersion_2);
 702         assoc->version = 2;
 703     }
 704     if (ODR_MASK_GET(req->protocolVersion, Z_ProtocolVersion_3))
 705     {
 706         ODR_MASK_SET(resp->protocolVersion, Z_ProtocolVersion_3);
 707         assoc->version = 3;
 708     }
 709     logf(LOG_LOG, "Negotiated to v%d: %s", assoc->version, options);
 710     assoc->maximumRecordSize = *req->maximumRecordSize;
 711     if (assoc->maximumRecordSize > control_block->maxrecordsize)
 712         assoc->maximumRecordSize = control_block->maxrecordsize;
 713     assoc->preferredMessageSize = *req->preferredMessageSize;
 714     if (assoc->preferredMessageSize > assoc->maximumRecordSize)
 715         assoc->preferredMessageSize = assoc->maximumRecordSize;
 716     resp->preferredMessageSize = &assoc->preferredMessageSize;
 717     resp->maximumRecordSize = &assoc->maximumRecordSize;
 718     resp->implementationName = "Index Data/YAZ Generic Frontend Server";
 719     if (binitres->errcode)
 720     {
 721         logf(LOG_LOG, "Connection rejected by backend.");
 722         *resp->result = 0;
 723         assoc->state = ASSOC_DEAD;
 724     }
 725     else
 726         assoc->state = ASSOC_UP;
 727     return apdu;
 728 }
 729
 730 /*
 731  * These functions should be merged.
 732  */
 733
 734 /*
 735  * nonsurrogate diagnostic record.
 736  */
 737 static Z_Records *diagrec(oid_proto proto, int error, char *addinfo)
 738 {
 739     static Z_Records rec;
 740     oident bib1;
 741     static int err;
 742 #ifdef Z_95
 743     static Z_DiagRec drec;
 744     static Z_DefaultDiagFormat dr;
 745 #else
 746     static Z_DiagRec dr;
 747 #endif
 748
 749     bib1.proto = proto;
 750     bib1.oclass = CLASS_DIAGSET;
 751     bib1.value = VAL_BIB1;
 752
 753     logf(LOG_DEBUG, "Diagnostic: %d -- %s", error, addinfo ? addinfo :
 754         "NULL");
 755     err = error;
 756     rec.which = Z_Records_NSD;
 757 #ifdef Z_95
 758     rec.u.nonSurrogateDiagnostic = &drec;
 759     drec.which = Z_DiagRec_defaultFormat;
 760     drec.u.defaultFormat = &dr;
 761 #else
 762     rec.u.nonSurrogateDiagnostic = &dr;
 763 #endif
 764     dr.diagnosticSetId = oid_getoidbyent(&bib1);
 765     dr.condition = &err;
 766     dr.which = Z_DiagForm_v2AddInfo;
 767     dr.addinfo = addinfo ? addinfo : "";
 768     return &rec;
 769 }
 770
 771 /*
 772  * surrogate diagnostic.
 773  */
 774 static Z_NamePlusRecord *surrogatediagrec(oid_proto proto, char *dbname,
 775                                             int error, char *addinfo)
 776 {
 777     static Z_NamePlusRecord rec;
 778     static int err;
 779     oident bib1;
 780 #ifdef Z_95
 781     static Z_DiagRec drec;
 782     static Z_DefaultDiagFormat dr;
 783 #else
 784     static Z_DiagRec dr;
 785 #endif
 786
 787     bib1.proto = proto;
 788     bib1.oclass = CLASS_DIAGSET;
 789     bib1.value = VAL_BIB1;
 790
 791     logf(LOG_DEBUG, "SurrogateDiagnotic: %d -- %s", error, addinfo);
 792     err = error;
 793     rec.databaseName = dbname;
 794     rec.which = Z_NamePlusRecord_surrogateDiagnostic;
 795 #ifdef Z_95
 796     rec.u.surrogateDiagnostic = &drec;
 797     drec.which = Z_DiagRec_defaultFormat;
 798     drec.u.defaultFormat = &dr;
 799 #else
 800     rec.u.surrogateDiagnostic = &dr;
 801 #endif
 802     dr.diagnosticSetId = oid_getoidbyent(&bib1);
 803     dr.condition = &err;
 804     dr.which = Z_DiagForm_v2AddInfo;
 805     dr.addinfo = addinfo ? addinfo : "";
 806     return &rec;
 807 }
 808
 809 /*
 810  * multiple nonsurrogate diagnostics.
 811  */
 812 static Z_DiagRecs *diagrecs(oid_proto proto, int error, char *addinfo)
 813 {
 814     static Z_DiagRecs recs;
 815     static int err;
 816     oident bib1;
 817 #ifdef Z_95
 818     static Z_DiagRec *recp[1], drec;
 819     static Z_DefaultDiagFormat rec;
 820 #else
 821     static Z_DiagRec *recp[1], rec;
 822 #endif
 823
 824     logf(LOG_DEBUG, "DiagRecs: %d -- %s", error, addinfo);
 825     bib1.proto = proto;
 826     bib1.oclass = CLASS_DIAGSET;
 827     bib1.value = VAL_BIB1;
 828
 829     err = error;
 830     recs.num_diagRecs = 1;
 831     recs.diagRecs = recp;
 832 #ifdef Z_95
 833     recp[0] = &drec;
 834     drec.which = Z_DiagRec_defaultFormat;
 835     drec.u.defaultFormat = &rec;
 836 #else
 837     recp[0] = &rec;
 838 #endif
 839     rec.diagnosticSetId = oid_getoidbyent(&bib1);
 840     rec.condition = &err;
 841     rec.which = Z_DiagForm_v2AddInfo;
 842     rec.addinfo = addinfo ? addinfo : "";
 843     return &recs;
 844 }
 845
 846 #define MAX_RECORDS 256
 847
 848 static Z_Records *pack_records(association *a, char *setname, int start,
 849                                 int *num, Z_RecordComposition *comp,
 850                                 int *next, int *pres, oid_value format)
 851 {
 852     int recno, total_length = 0, toget = *num;
 853     static Z_Records records;
 854     static Z_NamePlusRecordList reclist;
 855     static Z_NamePlusRecord *list[MAX_RECORDS];
 856     oident recform;
 857
 858     records.which = Z_Records_DBOSD;
 859     records.u.databaseOrSurDiagnostics = &reclist;
 860     reclist.num_records = 0;
 861     reclist.records = list;
 862     *pres = Z_PRES_SUCCESS;
 863     *num = 0;
 864     *next = 0;
 865
 866     logf(LOG_DEBUG, "Request to pack %d+%d", start, toget);
 867     logf(LOG_DEBUG, "pms=%d, mrs=%d", a->preferredMessageSize,
 868         a->maximumRecordSize);
 869     for (recno = start; reclist.num_records < toget; recno++)
 870     {
 871         bend_fetchrequest freq;
 872         bend_fetchresult *fres;
 873         Z_NamePlusRecord *thisrec;
 874         Z_DatabaseRecord *thisext;
 875         int this_length;
 876
 877         /*
 878          * we get the number of bytes allocated on the stream before any
 879          * allocation done by the backend - this should give us a reasonable
 880          * idea of the total size of the data so far.
 881          */
 882         total_length = odr_total(a->encode);
 883         if (reclist.num_records == MAX_RECORDS - 1)
 884         {
 885             *pres = Z_PRES_PARTIAL_2;
 886             break;
 887         }
 888         freq.setname = setname;
 889         freq.number = recno;
 890         freq.comp = comp;
 891         freq.format = format;
 892         freq.stream = a->encode;
 893         if (!(fres = bend_fetch(a->backend, &freq, 0)))
 894         {
 895             *pres = Z_PRES_FAILURE;
 896             return diagrec(a->proto, 2, "Backend interface problem");
 897         }
 898         /* backend should be able to signal whether error is system-wide
 899            or only pertaining to current record */
 900         if (fres->errcode)
 901         {
 902             *pres = Z_PRES_FAILURE;
 903             return diagrec(a->proto, fres->errcode, fres->errstring);
 904         }
 905         if (fres->len >= 0)
 906             this_length = fres->len;
 907         else
 908             this_length = odr_total(a->encode) - total_length;
 909         logf(LOG_DEBUG, "  fetched record, len=%d, total=%d",
 910             this_length, total_length);
 911         if (this_length + total_length > a->preferredMessageSize)
 912         {
 913             /* record is small enough, really */
 914             if (this_length <= a->preferredMessageSize)
 915             {
 916                 logf(LOG_DEBUG, "  Dropped last normal-sized record");
 917                 *pres = Z_PRES_PARTIAL_2;
 918                 break;
 919             }
 920             /* record can only be fetched by itself */
 921             if (this_length < a->maximumRecordSize)
 922             {
 923                 logf(LOG_DEBUG, "  Record > prefmsgsz");
 924                 if (toget > 1)
 925                 {
 926                     logf(LOG_DEBUG, "  Dropped it");
 927                     reclist.records[reclist.num_records] =
 928                          surrogatediagrec(a->proto, fres->basename, 16, 0);
 929                     reclist.num_records++;
 930                     *next = fres->last_in_set ? 0 : recno + 1;
 931                     continue;
 932                 }
 933             }
 934             else /* too big entirely */
 935             {
 936                 logf(LOG_DEBUG, "Record > maxrcdsz");
 937                 reclist.records[reclist.num_records] =
 938                     surrogatediagrec(a->proto, fres->basename, 17, 0);
 939                 reclist.num_records++;
 940                 *next = fres->last_in_set ? 0 : recno + 1;
 941                 continue;
 942             }
 943         }
 944         if (!(thisrec = odr_malloc(a->encode, sizeof(*thisrec))))
 945             return 0;
 946         if (!(thisrec->databaseName = odr_malloc(a->encode,
 947             strlen(fres->basename) + 1)))
 948             return 0;
 949         strcpy(thisrec->databaseName, fres->basename);
 950         thisrec->which = Z_NamePlusRecord_databaseRecord;
 951         if (!(thisrec->u.databaseRecord = thisext = odr_malloc(a->encode,
 952             sizeof(Z_DatabaseRecord))))
 953             return 0;
 954         recform.proto = a->proto;
 955         recform.oclass = CLASS_RECSYN;
 956         recform.value = fres->format;
 957         thisext->direct_reference = odr_oiddup(a->encode,
 958             oid_getoidbyent(&recform));
 959         thisext->indirect_reference = 0;
 960         thisext->descriptor = 0;
 961         if (fres->len < 0) /* Structured data */
 962         {
 963             switch (fres->format)
 964             {
 965                 case VAL_SUTRS: thisext->which = Z_External_sutrs; break;
 966                 case VAL_GRS1: thisext->which = Z_External_grs1; break;
 967                 case VAL_EXPLAIN: thisext->which = Z_External_explainRecord;
 968                     break;
 969                 case VAL_SUMMARY: thisext->which = Z_External_summary; break;
 970                 case VAL_OPAC: thisext->which = Z_External_OPAC; break;
 971
 972                 default:
 973                     logf(LOG_FATAL, "Unknown structured format from backend.");
 974                     return 0;
 975             }
 976
 977             /*
 978              * We cheat on the pointers here. Obviously, the record field
 979              * of the backend-fetch structure should have been a union for
 980              * correctness, but we're stuck with this for backwards
 981              * compatibility.
 982              */
 983             thisext->u.grs1 = (Z_GenericRecord*) fres->record;
 984         }
 985         else if (fres->format == VAL_SUTRS) /* SUTRS is a single-ASN.1-type */
 986         {
 987             Odr_oct *sutrs = odr_malloc(a->encode, sizeof(*sutrs));
 988
 989             thisext->which = Z_External_sutrs;
 990             thisext->u.sutrs = sutrs;
 991             sutrs->buf = odr_malloc(a->encode, fres->len);
 992             sutrs->len = sutrs->size = fres->len;
 993             memcpy(sutrs->buf, fres->record, fres->len);
 994         }
 995         else /* octet-aligned record. */
 996         {
 997             thisext->which = Z_External_octet;
 998             if (!(thisext->u.octet_aligned = odr_malloc(a->encode,
 999                 sizeof(Odr_oct))))
1000                 return 0;
1001             if (!(thisext->u.octet_aligned->buf = odr_malloc(a->encode,
1002                 fres->len)))
1003                 return 0;
1004             memcpy(thisext->u.octet_aligned->buf, fres->record, fres->len);
1005             thisext->u.octet_aligned->len = thisext->u.octet_aligned->size =
1006                 fres->len;
1007         }
1008         reclist.records[reclist.num_records] = thisrec;
1009         reclist.num_records++;
1010         *next = fres->last_in_set ? 0 : recno + 1;
1011     }
1012     *num = reclist.num_records;
1013     return &records;
1014 }
1015
1016 static Z_APDU *process_searchRequest(association *assoc, request *reqb,
1017     int *fd)
1018 {
1019     Z_SearchRequest *req = reqb->request->u.searchRequest;
1020     bend_searchrequest bsrq;
1021     bend_searchresult *bsrt;
1022
1023     logf(LOG_LOG, "Got SearchRequest.");
1024
1025     bsrq.setname = req->resultSetName;
1026     bsrq.replace_set = *req->replaceIndicator;
1027     bsrq.num_bases = req->num_databaseNames;
1028     bsrq.basenames = req->databaseNames;
1029     bsrq.query = req->query;
1030
1031     if (!(bsrt = bend_search(assoc->backend, &bsrq, fd)))
1032         return 0;
1033     return response_searchRequest(assoc, reqb, bsrt, fd);
1034 }
1035
1036 bend_searchresult *bend_searchresponse(void *handle) {return 0;}
1037
1038 /*
1039  * Prepare a searchresponse based on the backend results. We probably want
1040  * to look at making the fetching of records nonblocking as well, but
1041  * so far, we'll keep things simple.
1042  * If bsrt is null, that means we're called in response to a communications
1043  * event, and we'll have to get the response for ourselves.
1044  */
1045 static Z_APDU *response_searchRequest(association *assoc, request *reqb,
1046     bend_searchresult *bsrt, int *fd)
1047 {
1048     Z_SearchRequest *req = reqb->request->u.searchRequest;
1049     static Z_APDU apdu;
1050     static Z_SearchResponse resp;
1051     static int nulint = 0;
1052     static bool_t sr = 1;
1053     static int next = 0;
1054     static int none = Z_RES_NONE;
1055
1056     apdu.which = Z_APDU_searchResponse;
1057     apdu.u.searchResponse = &resp;
1058     resp.referenceId = req->referenceId;
1059 #ifdef Z_95
1060     resp.additionalSearchInfo = 0;
1061     resp.otherInfo = 0;
1062 #endif
1063     *fd = -1;
1064     if (!bsrt && !(bsrt = bend_searchresponse(assoc->backend)))
1065     {
1066         logf(LOG_FATAL, "Bad result from backend");
1067         return 0;
1068     }
1069     else if (bsrt->errcode)
1070     {
1071         resp.records = diagrec(assoc->proto, bsrt->errcode,
1072             bsrt->errstring);
1073         resp.resultCount = &nulint;
1074         resp.numberOfRecordsReturned = &nulint;
1075         resp.nextResultSetPosition = &nulint;
1076         resp.searchStatus = &nulint;
1077         resp.resultSetStatus = &none;
1078         resp.presentStatus = 0;
1079     }
1080     else
1081     {
1082         static int toget;
1083         Z_RecordComposition comp, *compp = 0;
1084         static int presst = 0;
1085
1086         resp.records = 0;
1087         resp.resultCount = &bsrt->hits;
1088
1089         comp.which = Z_RecordComp_simple;
1090         /* how many records does the user agent want, then? */
1091         if (bsrt->hits <= *req->smallSetUpperBound)
1092         {
1093             toget = bsrt->hits;
1094             if ((comp.u.simple = req->smallSetElementSetNames))
1095                 compp = &comp;
1096         }
1097         else if (bsrt->hits < *req->largeSetLowerBound)
1098         {
1099             toget = *req->mediumSetPresentNumber;
1100             if (toget > bsrt->hits)
1101                 toget = bsrt->hits;
1102             if ((comp.u.simple = req->mediumSetElementSetNames))
1103                 compp = &comp;
1104         }
1105         else
1106             toget = 0;
1107
1108         if (toget && !resp.records)
1109         {
1110             oident *prefformat;
1111             oid_value form;
1112
1113             if (!(prefformat = oid_getentbyoid(req->preferredRecordSyntax)) ||
1114                 prefformat->oclass != CLASS_RECSYN)
1115                 form = VAL_NONE;
1116             else
1117                 form = prefformat->value;
1118             resp.records = pack_records(assoc, req->resultSetName, 1,
1119                 &toget, compp, &next, &presst, form);
1120             if (!resp.records)
1121                 return 0;
1122             resp.numberOfRecordsReturned = &toget;
1123             resp.nextResultSetPosition = &next;
1124             resp.searchStatus = &sr;
1125             resp.resultSetStatus = 0;
1126             resp.presentStatus = &presst;
1127         }
1128         else
1129         {
1130             if (*resp.resultCount)
1131                 next = 1;
1132             resp.numberOfRecordsReturned = &nulint;
1133             resp.nextResultSetPosition = &next;
1134             resp.searchStatus = &sr;
1135             resp.resultSetStatus = 0;
1136             resp.presentStatus = 0;
1137         }
1138     }
1139     return &apdu;
1140 }
1141
1142 /*
1143  * Maybe we got a little over-friendly when we designed bend_fetch to
1144  * get only one record at a time. Some backends can optimise multiple-record
1145  * fetches, and at any rate, there is some overhead involved in
1146  * all that selecting and hopping around. Problem is, of course, that the
1147  * frontend can't know ahead of time how many records it'll need to
1148  * fill the negotiated PDU size. Annoying. Segmentation or not, Z/SR
1149  * is downright lousy as a bulk data transfer protocol.
1150  *
1151  * To start with, we'll do the fetching of records from the backend
1152  * in one operation: To save some trips in and out of the event-handler,
1153  * and to simplify the interface to pack_records. At any rate, asynch
1154  * operation is more fun in operations that have an unpredictable execution
1155  * speed - which is normally more true for search than for present.
1156  */
1157 static Z_APDU *process_presentRequest(association *assoc, request *reqb,
1158     int *fd)
1159 {
1160     Z_PresentRequest *req = reqb->request->u.presentRequest;
1161     static Z_APDU apdu;
1162     static Z_PresentResponse resp;
1163     static int presst, next, num;
1164     oident *prefformat;
1165     oid_value form;
1166
1167
1168     logf(LOG_LOG, "Got PresentRequest.");
1169     apdu.which = Z_APDU_presentResponse;
1170     apdu.u.presentResponse = &resp;
1171     resp.referenceId = req->referenceId;
1172 #ifdef Z_95
1173     resp.otherInfo = 0;
1174 #endif
1175
1176     if (!(prefformat = oid_getentbyoid(req->preferredRecordSyntax)) ||
1177         prefformat->oclass != CLASS_RECSYN)
1178         form = VAL_NONE;
1179     else
1180         form = prefformat->value;
1181     num = *req->numberOfRecordsRequested;
1182     resp.records = pack_records(assoc, req->resultSetId,
1183         *req->resultSetStartPoint, &num, req->recordComposition, &next,
1184         &presst, form);
1185     if (!resp.records)
1186         return 0;
1187     resp.numberOfRecordsReturned = &num;
1188     resp.presentStatus = &presst;
1189     resp.nextResultSetPosition = &next;
1190
1191     return &apdu;
1192 }
1193
1194 /*
1195  * Scan was implemented rather in a hurry, and with support for only the basic
1196  * elements of the service in the backend API. Suggestions are welcome.
1197  */
1198 static Z_APDU *process_scanRequest(association *assoc, request *reqb, int *fd)
1199 {
1200     Z_ScanRequest *req = reqb->request->u.scanRequest;
1201     static Z_APDU apdu;
1202     static Z_ScanResponse res;
1203     static int scanStatus = Z_Scan_failure;
1204     static int numberOfEntriesReturned = 0;
1205     oident *attent;
1206     static Z_ListEntries ents;
1207 #define SCAN_MAX_ENTRIES 200
1208     static Z_Entry *tab[SCAN_MAX_ENTRIES];
1209     bend_scanrequest srq;
1210     bend_scanresult *srs;
1211     oident *attset;
1212
1213     logf(LOG_LOG, "Got scanrequest");
1214     apdu.which = Z_APDU_scanResponse;
1215     apdu.u.scanResponse = &res;
1216     res.referenceId = req->referenceId;
1217     res.stepSize = 0;
1218     res.scanStatus = &scanStatus;
1219     res.numberOfEntriesReturned = &numberOfEntriesReturned;
1220     res.positionOfTerm = 0;
1221     res.entries = &ents;
1222     ents.which = Z_ListEntries_nonSurrogateDiagnostics;
1223     res.attributeSet = 0;
1224 #ifdef Z_95
1225     res.otherInfo = 0;
1226 #endif
1227
1228     if (req->attributeSet && (!(attent = oid_getentbyoid(req->attributeSet)) ||
1229         attent->oclass != CLASS_ATTSET || attent->value != VAL_BIB1))
1230         ents.u.nonSurrogateDiagnostics = diagrecs(assoc->proto, 121, 0);
1231     else if (req->stepSize && *req->stepSize > 0)
1232         ents.u.nonSurrogateDiagnostics = diagrecs(assoc->proto, 205, 0);
1233     else
1234     {
1235         if (req->termListAndStartPoint->term->which == Z_Term_general)
1236             logf(LOG_DEBUG, " term: '%.*s'",
1237                 req->termListAndStartPoint->term->u.general->len,
1238                 req->termListAndStartPoint->term->u.general->buf);
1239         srq.num_bases = req->num_databaseNames;
1240         srq.basenames = req->databaseNames;
1241         srq.num_entries = *req->numberOfTermsRequested;
1242         srq.term = req->termListAndStartPoint;
1243         if (!(attset = oid_getentbyoid(req->attributeSet)) ||
1244             attset->oclass != CLASS_RECSYN)
1245             srq.attributeset = VAL_NONE;
1246         else
1247             srq.attributeset = attset->value;
1248         srq.term_position = req->preferredPositionInResponse ?
1249             *req->preferredPositionInResponse : 1;
1250         if (!(srs = bend_scan(assoc->backend, &srq, 0)))
1251             ents.u.nonSurrogateDiagnostics = diagrecs(assoc->proto, 2, 0);
1252         else if (srs->errcode)
1253             ents.u.nonSurrogateDiagnostics = diagrecs(assoc->proto,
1254                 srs->errcode, srs->errstring);
1255         else
1256         {
1257             int i;
1258             static Z_Entries list;
1259
1260             if (srs->status == BEND_SCAN_PARTIAL)
1261                 scanStatus = Z_Scan_partial_5;
1262             else
1263                 scanStatus = Z_Scan_success;
1264             ents.which = Z_ListEntries_entries;
1265             ents.u.entries = &list;
1266             list.entries = tab;
1267             for (i = 0; i < srs->num_entries; i++)
1268             {
1269                 Z_Entry *e;
1270                 Z_TermInfo *t;
1271                 Odr_oct *o;
1272
1273                 if (i >= SCAN_MAX_ENTRIES)
1274                 {
1275                     scanStatus = Z_Scan_partial_4;
1276                     break;
1277                 }
1278                 list.entries[i] = e = odr_malloc(assoc->encode, sizeof(*e));
1279                 e->which = Z_Entry_termInfo;
1280                 e->u.termInfo = t = odr_malloc(assoc->encode, sizeof(*t));
1281                 t->suggestedAttributes = 0;
1282                 t->displayTerm = 0;
1283                 t->alternativeTerm = 0;
1284                 t->byAttributes = 0;
1285                 t->otherTermInfo = 0;
1286                 t->globalOccurrences = &srs->entries[i].occurrences;
1287                 t->term = odr_malloc(assoc->encode, sizeof(*t->term));
1288                 t->term->which = Z_Term_general;
1289                 t->term->u.general = o = odr_malloc(assoc->encode,
1290                     sizeof(Odr_oct));
1291                 o->buf = odr_malloc(assoc->encode, o->len = o->size =
1292                     strlen(srs->entries[i].term));
1293                 memcpy(o->buf, srs->entries[i].term, o->len);
1294                 logf(LOG_DEBUG, "  term #%d: '%s' (%d)", i,
1295                     srs->entries[i].term, srs->entries[i].occurrences);
1296             }
1297             list.num_entries = i;
1298             res.numberOfEntriesReturned = &list.num_entries;
1299             res.positionOfTerm = &srs->term_position;
1300         }
1301     }
1302
1303     return &apdu;
1304 }
1305
1306 static void process_close(association *assoc, request *reqb)
1307 {
1308     Z_Close *req = reqb->request->u.close;
1309     static char *reasons[] =
1310     {
1311         "finished",
1312         "shutdown",
1313         "systemProblem",
1314         "costLimit",
1315         "resources",
1316         "securityViolation",
1317         "protocolError",
1318         "lackOfActivity",
1319         "peerAbort",
1320         "unspecified"
1321     };
1322
1323     logf(LOG_LOG, "Got close, reason %s, message %s",
1324         reasons[*req->closeReason], req->diagnosticInformation ?
1325         req->diagnosticInformation : "NULL");
1326     if (assoc->version < 3) /* to make do_force respond with close */
1327         assoc->version = 3;
1328     do_close(assoc, Z_Close_finished, "Association terminated by client");
1329 }