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