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