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