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