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 1.62  1996-07-06 19:58:35  quinn
   8  * System headerfiles gathered in yconfig
   9  *
  10  * Revision 1.61  1996/06/10  08:56:16  quinn
  11  * Work on Summary.
  12  *
  13  * Revision 1.60  1996/05/30  11:03:10  quinn
  14  * Fixed NextresultSetPosition bug fixed.
  15  *
  16  * Revision 1.59  1996/05/14  09:26:46  quinn
  17  * Added attribute set to scan backend
  18  *
  19  * Revision 1.58  1996/02/20  12:53:04  quinn
  20  * Chanes to SCAN
  21  *
  22  * Revision 1.57  1996/01/02  08:57:47  quinn
  23  * Changed enums in the ASN.1 .h files to #defines. Changed oident.class to oclass
  24  *
  25  * Revision 1.56  1995/12/14  11:09:57  quinn
  26  * Work on Explain
  27  *
  28  * Revision 1.55  1995/11/08  17:41:37  quinn
  29  * Smallish.
  30  *
  31  * Revision 1.54  1995/11/08  15:11:29  quinn
  32  * Log of close transmit.
  33  *
  34  * Revision 1.53  1995/11/01  13:54:58  quinn
  35  * Minor adjustments
  36  *
  37  * Revision 1.52  1995/11/01  12:19:13  quinn
  38  * Second attempt to fix same bug.
  39  *
  40  * Revision 1.50  1995/10/25  16:58:32  quinn
  41  * Simple.
  42  *
  43  * Revision 1.49  1995/10/16  13:51:53  quinn
  44  * Changes to provide Especs to the backend.
  45  *
  46  * Revision 1.48  1995/10/06  08:51:20  quinn
  47  * Added Write-buffer.
  48  *
  49  * Revision 1.47  1995/08/29  14:24:16  quinn
  50  * Added second half of close-handshake
  51  *
  52  * Revision 1.46  1995/08/29  11:17:58  quinn
  53  * Added code to receive close
  54  *
  55  * Revision 1.45  1995/08/21  09:11:00  quinn
  56  * Smallish fixes to suppport new formats.
  57  *
  58  * Revision 1.44  1995/08/17  12:45:25  quinn
  59  * Fixed minor problems with GRS-1. Added support in c&s.
  60  *
  61  * Revision 1.43  1995/08/15  12:00:31  quinn
  62  * Updated External
  63  *
  64  * Revision 1.42  1995/08/15  11:16:50  quinn
  65  *
  66  * Revision 1.41  1995/08/02  10:23:06  quinn
  67  * Smallish
  68  *
  69  * Revision 1.40  1995/07/31  14:34:26  quinn
  70  * Fixed bug in process_searchResponse (numberOfRecordsReturned).
  71  *
  72  * Revision 1.39  1995/06/27  13:21:00  quinn
  73  * SUTRS support
  74  *
  75  * Revision 1.38  1995/06/19  12:39:11  quinn
  76  * Fixed bug in timeout code. Added BER dumper.
  77  *
  78  * Revision 1.37  1995/06/16  13:16:14  quinn
  79  * Fixed Defaultdiagformat.
  80  *
  81  * Revision 1.36  1995/06/16  10:31:36  quinn
  82  * Added session timeout.
  83  *
  84  * Revision 1.35  1995/06/15  07:45:14  quinn
  85  * Moving to v3.
  86  *
  87  * Revision 1.34  1995/06/14  15:26:46  quinn
  88  * *** empty log message ***
  89  *
  90  * Revision 1.33  1995/06/06  14:57:05  quinn
  91  * Better diagnostics.
  92  *
  93  * Revision 1.32  1995/06/06  08:41:44  quinn
  94  * Better diagnostics.
  95  *
  96  * Revision 1.31  1995/06/06  08:15:37  quinn
  97  * Cosmetic.
  98  *
  99  * Revision 1.30  1995/06/05  10:53:32  quinn
 100  * Added a better SCAN.
 101  *
 102  * Revision 1.29  1995/06/01  11:25:03  quinn
 103  * Smallish.
 104  *
 105  * Revision 1.28  1995/06/01  11:21:01  quinn
 106  * Attempting to fix a bug in pack-records. replaced break with continue
 107  * for large records, according to standard.
 108  *
 109  * Revision 1.27  1995/05/29  08:12:06  quinn
 110  * Moved oid to util
 111  *
 112  * Revision 1.26  1995/05/18  13:02:12  quinn
 113  * Smallish.
 114  *
 115  * Revision 1.25  1995/05/17  08:42:26  quinn
 116  * Transfer auth info to backend. Allow backend to reject init gracefully.
 117  *
 118  * Revision 1.24  1995/05/16  08:51:04  quinn
 119  * License, documentation, and memory fixes
 120  *
 121  * Revision 1.23  1995/05/15  13:25:10  quinn
 122  * Fixed memory bug.
 123  *
 124  * Revision 1.22  1995/05/15  11:56:39  quinn
 125  * Asynchronous facilities. Restructuring of seshigh code.
 126  *
 127  * Revision 1.21  1995/05/02  08:53:19  quinn
 128  * Trying in vain to fix comm with ISODE
 129  *
 130  * Revision 1.20  1995/04/20  15:13:00  quinn
 131  * Cosmetic
 132  *
 133  * Revision 1.19  1995/04/18  08:15:34  quinn
 134  * Added dynamic memory allocation on encoding (whew). Code is now somewhat
 135  * neater. We'll make the same change for decoding one day.
 136  *
 137  * Revision 1.18  1995/04/17  11:28:25  quinn
 138  * Smallish
 139  *
 140  * Revision 1.17  1995/04/10  10:23:36  quinn
 141  * Some work to add scan and other things.
 142  *
 143  * Revision 1.16  1995/03/31  09:18:55  quinn
 144  * Added logging.
 145  *
 146  * Revision 1.15  1995/03/30  14:03:23  quinn
 147  * Added RFC1006 as separate library
 148  *
 149  * Revision 1.14  1995/03/30  12:18:17  quinn
 150  * Fixed bug.
 151  *
 152  * Revision 1.13  1995/03/30  09:09:24  quinn
 153  * Added state-handle and some support for asynchronous activities.
 154  *
 155  * Revision 1.12  1995/03/29  15:40:16  quinn
 156  * Ongoing work. Statserv is now dynamic by default
 157  *
 158  * Revision 1.11  1995/03/28  09:16:21  quinn
 159  * Added record packing to the search request
 160  *
 161  * Revision 1.10  1995/03/27  08:34:24  quinn
 162  * Added dynamic server functionality.
 163  * Released bindings to session.c (is now redundant)
 164  *
 165  * Revision 1.9  1995/03/22  15:01:26  quinn
 166  * Adjusting record packing.
 167  *
 168  * Revision 1.8  1995/03/22  10:13:21  quinn
 169  * Working on record packer
 170  *
 171  * Revision 1.7  1995/03/21  15:53:31  quinn
 172  * Little changes.
 173  *
 174  * Revision 1.6  1995/03/21  12:30:09  quinn
 175  * Beginning to add support for record packing.
 176  *
 177  * Revision 1.5  1995/03/17  10:44:13  quinn
 178  * Added catch of null-string in makediagrec
 179  *
 180  * Revision 1.4  1995/03/17  10:18:08  quinn
 181  * Added memory management.
 182  *
 183  * Revision 1.3  1995/03/16  17:42:39  quinn
 184  * Little changes
 185  *
 186  * Revision 1.2  1995/03/16  13:29:01  quinn
 187  * Partitioned server.
 188  *
 189  * Revision 1.1  1995/03/15  16:02:10  quinn
 190  * Modded session.c to seshigh.c
 191  *
 192  */
 193
 194 /*
 195  * Frontend server logic.
 196  *
 197  * This code receives incoming APDUs, and handles client requests by means
 198  * of the backend API.
 199  *
 200  * Some of the code is getting quite involved, compared to simpler servers -
 201  * primarily because it is asynchronous both in the communication with
 202  * the user and the backend. We think the complexity will pay off in
 203  * the form of greater flexibility when more asynchronous facilities
 204  * are implemented.
 205  *
 206  * Memory management has become somewhat involved. In the simple case, where
 207  * only one PDU is pending at a time, it will simply reuse the same memory,
 208  * once it has found its working size. When we enable multiple concurrent
 209  * operations, perhaps even with multiple parallel calls to the backend, it
 210  * will maintain a pool of buffers for encoding and decoding, trying to
 211  * minimize memory allocation/deallocation during normal operation.
 212  *
 213  * TODOs include (and will be done in order of public interest):
 214  *
 215  * Support for EXPLAIN - provide simple meta-database system.
 216  * Support for access control.
 217  * Support for resource control.
 218  * Support for extended services - primarily Item Order.
 219  * Rest of Z39.50-1994
 220  *
 221  */
 222
 223 #include <yconfig.h>
 224 #include <stdlib.h>
 225 #include <stdio.h>
 226 #include <unistd.h>
 227 #include <assert.h>
 228
 229 #include <xmalloc.h>
 230 #include <comstack.h>
 231 #include <eventl.h>
 232 #include <session.h>
 233 #include <proto.h>
 234 #include <oid.h>
 235 #include <log.h>
 236 #include <statserv.h>
 237
 238 #include <backend.h>
 239
 240 static int process_request(association *assoc);
 241 void backend_response(IOCHAN i, int event);
 242 static int process_response(association *assoc, request *req, Z_APDU *res);
 243 static Z_APDU *process_initRequest(association *assoc, request *reqb);
 244 static Z_APDU *process_searchRequest(association *assoc, request *reqb,
 245     int *fd);
 246 static Z_APDU *response_searchRequest(association *assoc, request *reqb,
 247     bend_searchresult *bsrt, int *fd);
 248 static Z_APDU *process_presentRequest(association *assoc, request *reqb,
 249     int *fd);
 250 static Z_APDU *process_scanRequest(association *assoc, request *reqb, int *fd);
 251 static void process_close(association *assoc, request *reqb);
 252
 253 static FILE *apduf = 0; /* for use in static mode */
 254 static statserv_options_block *control_block = 0;
 255
 256 /*
 257  * Create and initialize a new association-handle.
 258  *  channel  : iochannel for the current line.
 259  *  link     : communications channel.
 260  * Returns: 0 or a new association handle.
 261  */
 262 association *create_association(IOCHAN channel, COMSTACK link)
 263 {
 264     association *new;
 265
 266     if (!control_block)
 267         control_block = statserv_getcontrol();
 268     if (!(new = xmalloc(sizeof(*new))))
 269         return 0;
 270     new->client_chan = channel;
 271     new->client_link = link;
 272     if (!(new->decode = odr_createmem(ODR_DECODE)) ||
 273         !(new->encode = odr_createmem(ODR_ENCODE)))
 274         return 0;
 275     if (*control_block->apdufile)
 276     {
 277         char filename[256];
 278         FILE *f;
 279
 280         strcpy(filename, control_block->apdufile);
 281         if (!(new->print = odr_createmem(ODR_PRINT)))
 282             return 0;
 283         if (*control_block->apdufile != '-')
 284         {
 285             strcpy(filename, control_block->apdufile);
 286             if (!control_block->dynamic)
 287             {
 288                 if (!apduf)
 289                 {
 290                     if (!(apduf = fopen(filename, "w")))
 291                     {
 292                         logf(LOG_WARN|LOG_ERRNO, "%s", filename);
 293                         return 0;
 294                     }
 295                     setvbuf(apduf, 0, _IONBF, 0);
 296                 }
 297                 f = apduf;
 298             }
 299             else
 300             {
 301                 sprintf(filename + strlen(filename), ".%d", getpid());
 302                 if (!(f = fopen(filename, "w")))
 303                 {
 304                     logf(LOG_WARN|LOG_ERRNO, "%s", filename);
 305                     return 0;
 306                 }
 307                 setvbuf(f, 0, _IONBF, 0);
 308             }
 309             odr_setprint(new->print, f);
 310         }
 311     }
 312     else
 313         new->print = 0;
 314     new->input_buffer = 0;
 315     new->input_buffer_len = 0;
 316     new->backend = 0;
 317     new->state = ASSOC_NEW;
 318     request_initq(&new->incoming);
 319     request_initq(&new->outgoing);
 320     new->proto = cs_getproto(link);
 321     return new;
 322 }
 323
 324 /*
 325  * Free association and release resources.
 326  */
 327 void destroy_association(association *h)
 328 {
 329     odr_destroy(h->decode);
 330     odr_destroy(h->encode);
 331     if (h->print)
 332         odr_destroy(h->print);
 333     if (h->input_buffer)
 334     xfree(h->input_buffer);
 335     if (h->backend)
 336         bend_close(h->backend);
 337     while (request_deq(&h->incoming));
 338     while (request_deq(&h->outgoing));
 339    xfree(h);
 340 }
 341
 342 static void do_close(association *a, int reason, char *message)
 343 {
 344     Z_APDU apdu;
 345     Z_Close *cls = zget_Close(a->encode);
 346     request *req = request_get();
 347
 348     /* Purge request queue */
 349     while (request_deq(&a->incoming));
 350     while (request_deq(&a->outgoing));
 351     if (a->version >= 3)
 352     {
 353         logf(LOG_LOG, "Sending Close PDU, reason=%d, message=%s",
 354             reason, message ? message : "none");
 355         apdu.which = Z_APDU_close;
 356         apdu.u.close = cls;
 357         *cls->closeReason = reason;
 358         cls->diagnosticInformation = message;
 359         process_response(a, req, &apdu);
 360         iochan_settimeout(a->client_chan, 60);
 361     }
 362     else
 363     {
 364         logf(LOG_DEBUG, "v2 client. No Close PDU");
 365         iochan_setevent(a->client_chan, EVENT_TIMEOUT); /* force imm close */
 366     }
 367     a->state = ASSOC_DEAD;
 368 }
 369
 370 /*
 371  * This is where PDUs from the client are read and the further
 372  * processing is initiated. Flow of control moves down through the
 373  * various process_* functions below, until the encoded result comes back up
 374  * to the output handler in here.
 375  *
 376  *  h     : the I/O channel that has an outstanding event.
 377  *  event : the current outstanding event.
 378  */
 379 void ir_session(IOCHAN h, int event)
 380 {
 381     int res;
 382     association *assoc = iochan_getdata(h);
 383     COMSTACK conn = assoc->client_link;
 384     request *req;
 385
 386     assert(h && conn && assoc);
 387     if (event == EVENT_TIMEOUT)
 388     {
 389         if (assoc->state != ASSOC_UP)
 390         {
 391             logf(LOG_LOG, "Final timeout - closing connection.");
 392             cs_close(conn);
 393             destroy_association(assoc);
 394             iochan_destroy(h);
 395         }
 396         else
 397         {
 398             logf(LOG_LOG, "Session idle too long. Sending close.");
 399             do_close(assoc, Z_Close_lackOfActivity, 0);
 400         }
 401         return;
 402     }
 403     if (event & EVENT_INPUT || event & EVENT_WORK) /* input */
 404     {
 405         if (event & EVENT_INPUT)
 406         {
 407             logf(LOG_DEBUG, "ir_session (input)");
 408             assert(assoc && conn);
 409             /* We aren't speaking to this fellow */
 410             if (assoc->state == ASSOC_DEAD)
 411             {
 412                 logf(LOG_LOG, "Closed connection after reject");
 413                 cs_close(conn);
 414                 destroy_association(assoc);
 415                 iochan_destroy(h);
 416                 return;
 417             }
 418             if ((res = cs_get(conn, &assoc->input_buffer,
 419                 &assoc->input_buffer_len)) <= 0)
 420             {
 421                 logf(LOG_LOG, "Connection closed by client");
 422                 cs_close(conn);
 423                 destroy_association(assoc);
 424                 iochan_destroy(h);
 425                 return;
 426             }
 427             else if (res == 1) /* incomplete read - wait for more  */
 428                 return;
 429             if (cs_more(conn)) /* more stuff - call us again later, please */
 430                 iochan_setevent(h, EVENT_INPUT);
 431
 432             /* we got a complete PDU. Let's decode it */
 433             logf(LOG_DEBUG, "Got PDU, %d bytes", res);
 434             req = request_get(); /* get a new request structure */
 435             odr_reset(assoc->decode);
 436             odr_setbuf(assoc->decode, assoc->input_buffer, res, 0);
 437             if (!z_APDU(assoc->decode, &req->request, 0))
 438             {
 439                 logf(LOG_LOG, "ODR error on incoming PDU: %s [near byte %d] ",
 440                     odr_errlist[odr_geterror(assoc->decode)],
 441                     odr_offset(assoc->decode));
 442                 logf(LOG_LOG, "PDU dump:");
 443                 odr_dumpBER(log_file(), assoc->input_buffer, res);
 444                 do_close(assoc, Z_Close_protocolError, "Malformed package");
 445                 return;
 446             }
 447             req->request_mem = odr_extract_mem(assoc->decode);
 448             if (assoc->print && !z_APDU(assoc->print, &req->request, 0))
 449             {
 450                 logf(LOG_WARN, "ODR print error: %s",
 451                     odr_errlist[odr_geterror(assoc->print)]);
 452                 odr_reset(assoc->print);
 453             }
 454             request_enq(&assoc->incoming, req);
 455         }
 456
 457         /* can we do something yet? */
 458         req = request_head(&assoc->incoming);
 459         if (req->state == REQUEST_IDLE)
 460             if (process_request(assoc) < 0)
 461                 do_close(assoc, Z_Close_systemProblem, "Unknown error");
 462     }
 463     if (event & EVENT_OUTPUT)
 464     {
 465         request *req = request_head(&assoc->outgoing);
 466
 467         logf(LOG_DEBUG, "ir_session (output)");
 468         req->state = REQUEST_PENDING;
 469         switch (res = cs_put(conn, req->response, req->len_response))
 470         {
 471             case -1:
 472                 logf(LOG_LOG, "Connection closed by client");
 473                 cs_close(conn);
 474                 destroy_association(assoc);
 475                 iochan_destroy(h);
 476                 break;
 477             case 0: /* all sent - release the request structure */
 478                 logf(LOG_DEBUG, "Wrote PDU, %d bytes", req->len_response);
 479                 nmem_destroy(req->request_mem);
 480                 request_deq(&assoc->outgoing);
 481                 request_release(req);
 482                 if (!request_head(&assoc->outgoing))
 483                     iochan_clearflag(h, EVENT_OUTPUT);
 484                 break;
 485             /* value of 1 -- partial send -- is simply ignored */
 486         }
 487     }
 488     if (event & EVENT_EXCEPT)
 489     {
 490         logf(LOG_DEBUG, "ir_session (exception)");
 491         cs_close(conn);
 492         destroy_association(assoc);
 493         iochan_destroy(h);
 494     }
 495 }
 496
 497 /*
 498  * Initiate request processing.
 499  */
 500 static int process_request(association *assoc)
 501 {
 502     request *req = request_head(&assoc->incoming);
 503     int fd = -1;
 504     Z_APDU *res;
 505
 506     logf(LOG_DEBUG, "process_request");
 507     assert(req && req->state == REQUEST_IDLE);
 508     switch (req->request->which)
 509     {
 510         case Z_APDU_initRequest:
 511             res = process_initRequest(assoc, req); break;
 512         case Z_APDU_searchRequest:
 513             res = process_searchRequest(assoc, req, &fd); break;
 514         case Z_APDU_presentRequest:
 515             res = process_presentRequest(assoc, req, &fd); break;
 516         case Z_APDU_scanRequest:
 517             res = process_scanRequest(assoc, req, &fd); break;
 518         case Z_APDU_close:
 519             process_close(assoc, req); return 0;
 520         default:
 521             logf(LOG_WARN, "Bad APDU received");
 522             return -1;
 523     }
 524     if (res)
 525     {
 526         logf(LOG_DEBUG, "  result immediately available");
 527         return process_response(assoc, req, res);
 528     }
 529     else if (fd < 0)
 530     {
 531         logf(LOG_WARN, "   bad result");
 532         return -1;
 533     }
 534     else /* no result yet - one will be provided later */
 535     {
 536         IOCHAN chan;
 537
 538         /* Set up an I/O handler for the fd supplied by the backend */
 539
 540         logf(LOG_DEBUG, "   establishing handler for result");
 541         req->state = REQUEST_PENDING;
 542         if (!(chan = iochan_create(fd, backend_response, EVENT_INPUT)))
 543             abort();
 544         iochan_setdata(chan, assoc);
 545         return 0;
 546     }
 547 }
 548
 549 /*
 550  * Handle message from the backend.
 551  */
 552 void backend_response(IOCHAN i, int event)
 553 {
 554     association *assoc = iochan_getdata(i);
 555     request *req = request_head(&assoc->incoming);
 556     Z_APDU *res;
 557     int fd;
 558
 559     logf(LOG_DEBUG, "backend_response");
 560     assert(assoc && req && req->state != REQUEST_IDLE);
 561     /* determine what it is we're waiting for */
 562     switch (req->request->which)
 563     {
 564         case Z_APDU_searchRequest:
 565             res = response_searchRequest(assoc, req, 0, &fd); break;
 566 #if 0
 567         case Z_APDU_presentRequest:
 568             res = response_presentRequest(assoc, req, 0, &fd); break;
 569         case Z_APDU_scanRequest:
 570             res = response_scanRequest(assoc, req, 0, &fd); break;
 571 #endif
 572         default:
 573             logf(LOG_WARN, "Serious programmer's lapse or bug");
 574             abort();
 575     }
 576     if ((res && process_response(assoc, req, res) < 0) || fd < 0)
 577     {
 578         logf(LOG_LOG, "Fatal error when talking to backend");
 579         do_close(assoc, Z_Close_systemProblem, 0);
 580         iochan_destroy(i);
 581         return;
 582     }
 583     else if (!res) /* no result yet - try again later */
 584     {
 585         logf(LOG_DEBUG, "   no result yet");
 586         iochan_setfd(i, fd); /* in case fd has changed */
 587     }
 588 }
 589
 590 /*
 591  * Encode response, and transfer the request structure to the outgoing queue.
 592  */
 593 static int process_response(association *assoc, request *req, Z_APDU *res)
 594 {
 595     odr_setbuf(assoc->encode, req->response, req->size_response, 1);
 596     if (!z_APDU(assoc->encode, &res, 0))
 597     {
 598         logf(LOG_WARN, "ODR error when encoding response: %s",
 599             odr_errlist[odr_geterror(assoc->decode)]);
 600         odr_reset(assoc->encode);
 601         return -1;
 602     }
 603     req->response = odr_getbuf(assoc->encode, &req->len_response,
 604         &req->size_response);
 605     odr_setbuf(assoc->encode, 0, 0, 0); /* don'txfree if we abort later */
 606     odr_reset(assoc->encode);
 607     if (assoc->print && !z_APDU(assoc->print, &res, 0))
 608     {
 609         logf(LOG_WARN, "ODR print error: %s",
 610             odr_errlist[odr_geterror(assoc->print)]);
 611         odr_reset(assoc->print);
 612     }
 613     /* change this when we make the backend reentrant */
 614     if (req == request_head(&assoc->incoming))
 615     {
 616         req->state = REQUEST_IDLE;
 617         request_deq(&assoc->incoming);
 618     }
 619     request_enq(&assoc->outgoing, req);
 620     /* turn the work over to the ir_session handler */
 621     iochan_setflag(assoc->client_chan, EVENT_OUTPUT);
 622     /* Is there more work to be done? give that to the input handler too */
 623     if (request_head(&assoc->incoming))
 624         iochan_setevent(assoc->client_chan, EVENT_WORK);
 625     return 0;
 626 }
 627
 628 /*
 629  * Handle init request.
 630  * At the moment, we don't check the options
 631  * anywhere else in the code - we just try not to do anything that would
 632  * break a naive client. We'll toss 'em into the association block when
 633  * we need them there.
 634  */
 635 static Z_APDU *process_initRequest(association *assoc, request *reqb)
 636 {
 637     Z_InitRequest *req = reqb->request->u.initRequest;
 638     Z_APDU *apdu = zget_APDU(assoc->encode, Z_APDU_initResponse);
 639     Z_InitResponse *resp = apdu->u.initResponse;
 640     bend_initrequest binitreq;
 641     bend_initresult *binitres;
 642     char options[100];
 643
 644     logf(LOG_LOG, "Got initRequest");
 645     if (req->implementationId)
 646         logf(LOG_LOG, "Id:        %s", req->implementationId);
 647     if (req->implementationName)
 648         logf(LOG_LOG, "Name:      %s", req->implementationName);
 649     if (req->implementationVersion)
 650         logf(LOG_LOG, "Version:   %s", req->implementationVersion);
 651
 652     binitreq.configname = "default-config";
 653     binitreq.auth = req->idAuthentication;
 654     if (!(binitres = bend_init(&binitreq)))
 655     {
 656         logf(LOG_WARN, "Bad response from backend.");
 657         return 0;
 658     }
 659
 660     assoc->backend = binitres->handle;
 661     resp->referenceId = req->referenceId;
 662     *options = '\0';
 663     /* let's tell the client what we can do */
 664     if (ODR_MASK_GET(req->options, Z_Options_search))
 665     {
 666         ODR_MASK_SET(resp->options, Z_Options_search);
 667         strcat(options, "srch");
 668     }
 669     if (ODR_MASK_GET(req->options, Z_Options_present))
 670     {
 671         ODR_MASK_SET(resp->options, Z_Options_present);
 672         strcat(options, " prst");
 673     }
 674 #if 0
 675     if (ODR_MASK_GET(req->options, Z_Options_delSet))
 676     {
 677         ODR_MASK_SET(&options, Z_Options_delSet);
 678         strcat(options, " del");
 679     }
 680 #endif
 681     if (ODR_MASK_GET(req->options, Z_Options_namedResultSets))
 682     {
 683         ODR_MASK_SET(resp->options, Z_Options_namedResultSets);
 684         strcat(options, " namedresults");
 685     }
 686     if (ODR_MASK_GET(req->options, Z_Options_scan))
 687     {
 688         ODR_MASK_SET(resp->options, Z_Options_scan);
 689         strcat(options, " scan");
 690     }
 691     if (ODR_MASK_GET(req->options, Z_Options_concurrentOperations))
 692     {
 693         ODR_MASK_SET(resp->options, Z_Options_concurrentOperations);
 694         strcat(options, " concurop");
 695     }
 696
 697     if (ODR_MASK_GET(req->protocolVersion, Z_ProtocolVersion_1))
 698     {
 699         ODR_MASK_SET(resp->protocolVersion, Z_ProtocolVersion_1);
 700         assoc->version = 2; /* 1 & 2 are equivalent */
 701     }
 702     if (ODR_MASK_GET(req->protocolVersion, Z_ProtocolVersion_2))
 703     {
 704         ODR_MASK_SET(resp->protocolVersion, Z_ProtocolVersion_2);
 705         assoc->version = 2;
 706     }
 707     if (ODR_MASK_GET(req->protocolVersion, Z_ProtocolVersion_3))
 708     {
 709         ODR_MASK_SET(resp->protocolVersion, Z_ProtocolVersion_3);
 710         assoc->version = 3;
 711     }
 712     logf(LOG_LOG, "Negotiated to v%d: %s", assoc->version, options);
 713     assoc->maximumRecordSize = *req->maximumRecordSize;
 714     if (assoc->maximumRecordSize > control_block->maxrecordsize)
 715         assoc->maximumRecordSize = control_block->maxrecordsize;
 716     assoc->preferredMessageSize = *req->preferredMessageSize;
 717     if (assoc->preferredMessageSize > assoc->maximumRecordSize)
 718         assoc->preferredMessageSize = assoc->maximumRecordSize;
 719     resp->preferredMessageSize = &assoc->preferredMessageSize;
 720     resp->maximumRecordSize = &assoc->maximumRecordSize;
 721     resp->implementationName = "Index Data/YAZ Generic Frontend Server";
 722     if (binitres->errcode)
 723     {
 724         logf(LOG_LOG, "Connection rejected by backend.");
 725         *resp->result = 0;
 726         assoc->state = ASSOC_DEAD;
 727     }
 728     else
 729         assoc->state = ASSOC_UP;
 730     return apdu;
 731 }
 732
 733 /*
 734  * These functions should be merged.
 735  */
 736
 737 /*
 738  * nonsurrogate diagnostic record.
 739  */
 740 static Z_Records *diagrec(oid_proto proto, int error, char *addinfo)
 741 {
 742     static Z_Records rec;
 743     oident bib1;
 744     static int err;
 745 #ifdef Z_95
 746     static Z_DiagRec drec;
 747     static Z_DefaultDiagFormat dr;
 748 #else
 749     static Z_DiagRec dr;
 750 #endif
 751
 752     bib1.proto = proto;
 753     bib1.oclass = CLASS_DIAGSET;
 754     bib1.value = VAL_BIB1;
 755
 756     logf(LOG_DEBUG, "Diagnostic: %d -- %s", error, addinfo ? addinfo :
 757         "NULL");
 758     err = error;
 759     rec.which = Z_Records_NSD;
 760 #ifdef Z_95
 761     rec.u.nonSurrogateDiagnostic = &drec;
 762     drec.which = Z_DiagRec_defaultFormat;
 763     drec.u.defaultFormat = &dr;
 764 #else
 765     rec.u.nonSurrogateDiagnostic = &dr;
 766 #endif
 767     dr.diagnosticSetId = oid_getoidbyent(&bib1);
 768     dr.condition = &err;
 769     dr.which = Z_DiagForm_v2AddInfo;
 770     dr.addinfo = addinfo ? addinfo : "";
 771     return &rec;
 772 }
 773
 774 /*
 775  * surrogate diagnostic.
 776  */
 777 static Z_NamePlusRecord *surrogatediagrec(oid_proto proto, char *dbname,
 778                                             int error, char *addinfo)
 779 {
 780     static Z_NamePlusRecord rec;
 781     static int err;
 782     oident bib1;
 783 #ifdef Z_95
 784     static Z_DiagRec drec;
 785     static Z_DefaultDiagFormat dr;
 786 #else
 787     static Z_DiagRec dr;
 788 #endif
 789
 790     bib1.proto = proto;
 791     bib1.oclass = CLASS_DIAGSET;
 792     bib1.value = VAL_BIB1;
 793
 794     logf(LOG_DEBUG, "SurrogateDiagnotic: %d -- %s", error, addinfo);
 795     err = error;
 796     rec.databaseName = dbname;
 797     rec.which = Z_NamePlusRecord_surrogateDiagnostic;
 798 #ifdef Z_95
 799     rec.u.surrogateDiagnostic = &drec;
 800     drec.which = Z_DiagRec_defaultFormat;
 801     drec.u.defaultFormat = &dr;
 802 #else
 803     rec.u.surrogateDiagnostic = &dr;
 804 #endif
 805     dr.diagnosticSetId = oid_getoidbyent(&bib1);
 806     dr.condition = &err;
 807     dr.which = Z_DiagForm_v2AddInfo;
 808     dr.addinfo = addinfo ? addinfo : "";
 809     return &rec;
 810 }
 811
 812 /*
 813  * multiple nonsurrogate diagnostics.
 814  */
 815 static Z_DiagRecs *diagrecs(oid_proto proto, int error, char *addinfo)
 816 {
 817     static Z_DiagRecs recs;
 818     static int err;
 819     oident bib1;
 820 #ifdef Z_95
 821     static Z_DiagRec *recp[1], drec;
 822     static Z_DefaultDiagFormat rec;
 823 #else
 824     static Z_DiagRec *recp[1], rec;
 825 #endif
 826
 827     logf(LOG_DEBUG, "DiagRecs: %d -- %s", error, addinfo);
 828     bib1.proto = proto;
 829     bib1.oclass = CLASS_DIAGSET;
 830     bib1.value = VAL_BIB1;
 831
 832     err = error;
 833     recs.num_diagRecs = 1;
 834     recs.diagRecs = recp;
 835 #ifdef Z_95
 836     recp[0] = &drec;
 837     drec.which = Z_DiagRec_defaultFormat;
 838     drec.u.defaultFormat = &rec;
 839 #else
 840     recp[0] = &rec;
 841 #endif
 842     rec.diagnosticSetId = oid_getoidbyent(&bib1);
 843     rec.condition = &err;
 844     rec.which = Z_DiagForm_v2AddInfo;
 845     rec.addinfo = addinfo ? addinfo : "";
 846     return &recs;
 847 }
 848
 849 #define MAX_RECORDS 256
 850
 851 static Z_Records *pack_records(association *a, char *setname, int start,
 852                                 int *num, Z_RecordComposition *comp,
 853                                 int *next, int *pres, oid_value format)
 854 {
 855     int recno, total_length = 0, toget = *num;
 856     static Z_Records records;
 857     static Z_NamePlusRecordList reclist;
 858     static Z_NamePlusRecord *list[MAX_RECORDS];
 859     oident recform;
 860
 861     records.which = Z_Records_DBOSD;
 862     records.u.databaseOrSurDiagnostics = &reclist;
 863     reclist.num_records = 0;
 864     reclist.records = list;
 865     *pres = Z_PRES_SUCCESS;
 866     *num = 0;
 867     *next = 0;
 868
 869     logf(LOG_DEBUG, "Request to pack %d+%d", start, toget);
 870     logf(LOG_DEBUG, "pms=%d, mrs=%d", a->preferredMessageSize,
 871         a->maximumRecordSize);
 872     for (recno = start; reclist.num_records < toget; recno++)
 873     {
 874         bend_fetchrequest freq;
 875         bend_fetchresult *fres;
 876         Z_NamePlusRecord *thisrec;
 877         Z_DatabaseRecord *thisext;
 878         int this_length;
 879
 880         /*
 881          * we get the number of bytes allocated on the stream before any
 882          * allocation done by the backend - this should give us a reasonable
 883          * idea of the total size of the data so far.
 884          */
 885         total_length = odr_total(a->encode);
 886         if (reclist.num_records == MAX_RECORDS - 1)
 887         {
 888             *pres = Z_PRES_PARTIAL_2;
 889             break;
 890         }
 891         freq.setname = setname;
 892         freq.number = recno;
 893         freq.comp = comp;
 894         freq.format = format;
 895         freq.stream = a->encode;
 896         if (!(fres = bend_fetch(a->backend, &freq, 0)))
 897         {
 898             *pres = Z_PRES_FAILURE;
 899             return diagrec(a->proto, 2, "Backend interface problem");
 900         }
 901         /* backend should be able to signal whether error is system-wide
 902            or only pertaining to current record */
 903         if (fres->errcode)
 904         {
 905             *pres = Z_PRES_FAILURE;
 906             return diagrec(a->proto, fres->errcode, fres->errstring);
 907         }
 908         if (fres->len >= 0)
 909             this_length = fres->len;
 910         else
 911             this_length = odr_total(a->encode) - total_length;
 912         logf(LOG_DEBUG, "  fetched record, len=%d, total=%d",
 913             this_length, total_length);
 914         if (this_length + total_length > a->preferredMessageSize)
 915         {
 916             /* record is small enough, really */
 917             if (this_length <= a->preferredMessageSize)
 918             {
 919                 logf(LOG_DEBUG, "  Dropped last normal-sized record");
 920                 *pres = Z_PRES_PARTIAL_2;
 921                 break;
 922             }
 923             /* record can only be fetched by itself */
 924             if (this_length < a->maximumRecordSize)
 925             {
 926                 logf(LOG_DEBUG, "  Record > prefmsgsz");
 927                 if (toget > 1)
 928                 {
 929                     logf(LOG_DEBUG, "  Dropped it");
 930                     reclist.records[reclist.num_records] =
 931                          surrogatediagrec(a->proto, fres->basename, 16, 0);
 932                     reclist.num_records++;
 933                     *next = fres->last_in_set ? 0 : recno + 1;
 934                     continue;
 935                 }
 936             }
 937             else /* too big entirely */
 938             {
 939                 logf(LOG_DEBUG, "Record > maxrcdsz");
 940                 reclist.records[reclist.num_records] =
 941                     surrogatediagrec(a->proto, fres->basename, 17, 0);
 942                 reclist.num_records++;
 943                 *next = fres->last_in_set ? 0 : recno + 1;
 944                 continue;
 945             }
 946         }
 947         if (!(thisrec = odr_malloc(a->encode, sizeof(*thisrec))))
 948             return 0;
 949         if (!(thisrec->databaseName = odr_malloc(a->encode,
 950             strlen(fres->basename) + 1)))
 951             return 0;
 952         strcpy(thisrec->databaseName, fres->basename);
 953         thisrec->which = Z_NamePlusRecord_databaseRecord;
 954         if (!(thisrec->u.databaseRecord = thisext = odr_malloc(a->encode,
 955             sizeof(Z_DatabaseRecord))))
 956             return 0;
 957         recform.proto = a->proto;
 958         recform.oclass = CLASS_RECSYN;
 959         recform.value = fres->format;
 960         thisext->direct_reference = odr_oiddup(a->encode,
 961             oid_getoidbyent(&recform));
 962         thisext->indirect_reference = 0;
 963         thisext->descriptor = 0;
 964         if (fres->len < 0) /* Structured data */
 965         {
 966             switch (fres->format)
 967             {
 968                 case VAL_SUTRS: thisext->which = Z_External_sutrs; break;
 969                 case VAL_GRS1: thisext->which = Z_External_grs1; break;
 970                 case VAL_EXPLAIN: thisext->which = Z_External_explainRecord;
 971                     break;
 972                 case VAL_SUMMARY: thisext->which = Z_External_summary; break;
 973                 case VAL_OPAC: thisext->which = Z_External_OPAC; break;
 974
 975                 default:
 976                     logf(LOG_FATAL, "Unknown structured format from backend.");
 977                     return 0;
 978             }
 979
 980             /*
 981              * We cheat on the pointers here. Obviously, the record field
 982              * of the backend-fetch structure should have been a union for
 983              * correctness, but we're stuck with this for backwards
 984              * compatibility.
 985              */
 986             thisext->u.grs1 = (Z_GenericRecord*) fres->record;
 987         }
 988         else if (fres->format == VAL_SUTRS) /* SUTRS is a single-ASN.1-type */
 989         {
 990             Odr_oct *sutrs = odr_malloc(a->encode, sizeof(*sutrs));
 991
 992             thisext->which = Z_External_sutrs;
 993             thisext->u.sutrs = sutrs;
 994             sutrs->buf = odr_malloc(a->encode, fres->len);
 995             sutrs->len = sutrs->size = fres->len;
 996             memcpy(sutrs->buf, fres->record, fres->len);
 997         }
 998         else /* octet-aligned record. */
 999         {
1000             thisext->which = Z_External_octet;
1001             if (!(thisext->u.octet_aligned = odr_malloc(a->encode,
1002                 sizeof(Odr_oct))))
1003                 return 0;
1004             if (!(thisext->u.octet_aligned->buf = odr_malloc(a->encode,
1005                 fres->len)))
1006                 return 0;
1007             memcpy(thisext->u.octet_aligned->buf, fres->record, fres->len);
1008             thisext->u.octet_aligned->len = thisext->u.octet_aligned->size =
1009                 fres->len;
1010         }
1011         reclist.records[reclist.num_records] = thisrec;
1012         reclist.num_records++;
1013         *next = fres->last_in_set ? 0 : recno + 1;
1014     }
1015     *num = reclist.num_records;
1016     return &records;
1017 }
1018
1019 static Z_APDU *process_searchRequest(association *assoc, request *reqb,
1020     int *fd)
1021 {
1022     Z_SearchRequest *req = reqb->request->u.searchRequest;
1023     bend_searchrequest bsrq;
1024     bend_searchresult *bsrt;
1025
1026     logf(LOG_LOG, "Got SearchRequest.");
1027
1028     bsrq.setname = req->resultSetName;
1029     bsrq.replace_set = *req->replaceIndicator;
1030     bsrq.num_bases = req->num_databaseNames;
1031     bsrq.basenames = req->databaseNames;
1032     bsrq.query = req->query;
1033
1034     if (!(bsrt = bend_search(assoc->backend, &bsrq, fd)))
1035         return 0;
1036     return response_searchRequest(assoc, reqb, bsrt, fd);
1037 }
1038
1039 bend_searchresult *bend_searchresponse(void *handle) {return 0;}
1040
1041 /*
1042  * Prepare a searchresponse based on the backend results. We probably want
1043  * to look at making the fetching of records nonblocking as well, but
1044  * so far, we'll keep things simple.
1045  * If bsrt is null, that means we're called in response to a communications
1046  * event, and we'll have to get the response for ourselves.
1047  */
1048 static Z_APDU *response_searchRequest(association *assoc, request *reqb,
1049     bend_searchresult *bsrt, int *fd)
1050 {
1051     Z_SearchRequest *req = reqb->request->u.searchRequest;
1052     static Z_APDU apdu;
1053     static Z_SearchResponse resp;
1054     static int nulint = 0;
1055     static bool_t sr = 1;
1056     static int next = 0;
1057     static int none = Z_RES_NONE;
1058
1059     apdu.which = Z_APDU_searchResponse;
1060     apdu.u.searchResponse = &resp;
1061     resp.referenceId = req->referenceId;
1062 #ifdef Z_95
1063     resp.additionalSearchInfo = 0;
1064     resp.otherInfo = 0;
1065 #endif
1066     *fd = -1;
1067     if (!bsrt && !(bsrt = bend_searchresponse(assoc->backend)))
1068     {
1069         logf(LOG_FATAL, "Bad result from backend");
1070         return 0;
1071     }
1072     else if (bsrt->errcode)
1073     {
1074         resp.records = diagrec(assoc->proto, bsrt->errcode,
1075             bsrt->errstring);
1076         resp.resultCount = &nulint;
1077         resp.numberOfRecordsReturned = &nulint;
1078         resp.nextResultSetPosition = &nulint;
1079         resp.searchStatus = &nulint;
1080         resp.resultSetStatus = &none;
1081         resp.presentStatus = 0;
1082     }
1083     else
1084     {
1085         static int toget;
1086         Z_RecordComposition comp, *compp = 0;
1087         static int presst = 0;
1088
1089         resp.records = 0;
1090         resp.resultCount = &bsrt->hits;
1091
1092         comp.which = Z_RecordComp_simple;
1093         /* how many records does the user agent want, then? */
1094         if (bsrt->hits <= *req->smallSetUpperBound)
1095         {
1096             toget = bsrt->hits;
1097             if ((comp.u.simple = req->smallSetElementSetNames))
1098                 compp = &comp;
1099         }
1100         else if (bsrt->hits < *req->largeSetLowerBound)
1101         {
1102             toget = *req->mediumSetPresentNumber;
1103             if (toget > bsrt->hits)
1104                 toget = bsrt->hits;
1105             if ((comp.u.simple = req->mediumSetElementSetNames))
1106                 compp = &comp;
1107         }
1108         else
1109             toget = 0;
1110
1111         if (toget && !resp.records)
1112         {
1113             oident *prefformat;
1114             oid_value form;
1115
1116             if (!(prefformat = oid_getentbyoid(req->preferredRecordSyntax)) ||
1117                 prefformat->oclass != CLASS_RECSYN)
1118                 form = VAL_NONE;
1119             else
1120                 form = prefformat->value;
1121             resp.records = pack_records(assoc, req->resultSetName, 1,
1122                 &toget, compp, &next, &presst, form);
1123             if (!resp.records)
1124                 return 0;
1125             resp.numberOfRecordsReturned = &toget;
1126             resp.nextResultSetPosition = &next;
1127             resp.searchStatus = &sr;
1128             resp.resultSetStatus = 0;
1129             resp.presentStatus = &presst;
1130         }
1131         else
1132         {
1133             if (*resp.resultCount)
1134                 next = 1;
1135             resp.numberOfRecordsReturned = &nulint;
1136             resp.nextResultSetPosition = &next;
1137             resp.searchStatus = &sr;
1138             resp.resultSetStatus = 0;
1139             resp.presentStatus = 0;
1140         }
1141     }
1142     return &apdu;
1143 }
1144
1145 /*
1146  * Maybe we got a little over-friendly when we designed bend_fetch to
1147  * get only one record at a time. Some backends can optimise multiple-record
1148  * fetches, and at any rate, there is some overhead involved in
1149  * all that selecting and hopping around. Problem is, of course, that the
1150  * frontend can't know ahead of time how many records it'll need to
1151  * fill the negotiated PDU size. Annoying. Segmentation or not, Z/SR
1152  * is downright lousy as a bulk data transfer protocol.
1153  *
1154  * To start with, we'll do the fetching of records from the backend
1155  * in one operation: To save some trips in and out of the event-handler,
1156  * and to simplify the interface to pack_records. At any rate, asynch
1157  * operation is more fun in operations that have an unpredictable execution
1158  * speed - which is normally more true for search than for present.
1159  */
1160 static Z_APDU *process_presentRequest(association *assoc, request *reqb,
1161     int *fd)
1162 {
1163     Z_PresentRequest *req = reqb->request->u.presentRequest;
1164     static Z_APDU apdu;
1165     static Z_PresentResponse resp;
1166     static int presst, next, num;
1167     oident *prefformat;
1168     oid_value form;
1169
1170
1171     logf(LOG_LOG, "Got PresentRequest.");
1172     apdu.which = Z_APDU_presentResponse;
1173     apdu.u.presentResponse = &resp;
1174     resp.referenceId = req->referenceId;
1175 #ifdef Z_95
1176     resp.otherInfo = 0;
1177 #endif
1178
1179     if (!(prefformat = oid_getentbyoid(req->preferredRecordSyntax)) ||
1180         prefformat->oclass != CLASS_RECSYN)
1181         form = VAL_NONE;
1182     else
1183         form = prefformat->value;
1184     num = *req->numberOfRecordsRequested;
1185     resp.records = pack_records(assoc, req->resultSetId,
1186         *req->resultSetStartPoint, &num, req->recordComposition, &next,
1187         &presst, form);
1188     if (!resp.records)
1189         return 0;
1190     resp.numberOfRecordsReturned = &num;
1191     resp.presentStatus = &presst;
1192     resp.nextResultSetPosition = &next;
1193
1194     return &apdu;
1195 }
1196
1197 /*
1198  * Scan was implemented rather in a hurry, and with support for only the basic
1199  * elements of the service in the backend API. Suggestions are welcome.
1200  */
1201 static Z_APDU *process_scanRequest(association *assoc, request *reqb, int *fd)
1202 {
1203     Z_ScanRequest *req = reqb->request->u.scanRequest;
1204     static Z_APDU apdu;
1205     static Z_ScanResponse res;
1206     static int scanStatus = Z_Scan_failure;
1207     static int numberOfEntriesReturned = 0;
1208     oident *attent;
1209     static Z_ListEntries ents;
1210 #define SCAN_MAX_ENTRIES 200
1211     static Z_Entry *tab[SCAN_MAX_ENTRIES];
1212     bend_scanrequest srq;
1213     bend_scanresult *srs;
1214     oident *attset;
1215
1216     logf(LOG_LOG, "Got scanrequest");
1217     apdu.which = Z_APDU_scanResponse;
1218     apdu.u.scanResponse = &res;
1219     res.referenceId = req->referenceId;
1220     res.stepSize = 0;
1221     res.scanStatus = &scanStatus;
1222     res.numberOfEntriesReturned = &numberOfEntriesReturned;
1223     res.positionOfTerm = 0;
1224     res.entries = &ents;
1225     ents.which = Z_ListEntries_nonSurrogateDiagnostics;
1226     res.attributeSet = 0;
1227 #ifdef Z_95
1228     res.otherInfo = 0;
1229 #endif
1230
1231     if (req->attributeSet && (!(attent = oid_getentbyoid(req->attributeSet)) ||
1232         attent->oclass != CLASS_ATTSET || attent->value != VAL_BIB1))
1233         ents.u.nonSurrogateDiagnostics = diagrecs(assoc->proto, 121, 0);
1234     else if (req->stepSize && *req->stepSize > 0)
1235         ents.u.nonSurrogateDiagnostics = diagrecs(assoc->proto, 205, 0);
1236     else
1237     {
1238         if (req->termListAndStartPoint->term->which == Z_Term_general)
1239             logf(LOG_DEBUG, " term: '%.*s'",
1240                 req->termListAndStartPoint->term->u.general->len,
1241                 req->termListAndStartPoint->term->u.general->buf);
1242         srq.num_bases = req->num_databaseNames;
1243         srq.basenames = req->databaseNames;
1244         srq.num_entries = *req->numberOfTermsRequested;
1245         srq.term = req->termListAndStartPoint;
1246         if (!(attset = oid_getentbyoid(req->attributeSet)) ||
1247             attset->oclass != CLASS_RECSYN)
1248             srq.attributeset = VAL_NONE;
1249         else
1250             srq.attributeset = attset->value;
1251         srq.term_position = req->preferredPositionInResponse ?
1252             *req->preferredPositionInResponse : 1;
1253         if (!(srs = bend_scan(assoc->backend, &srq, 0)))
1254             ents.u.nonSurrogateDiagnostics = diagrecs(assoc->proto, 2, 0);
1255         else if (srs->errcode)
1256             ents.u.nonSurrogateDiagnostics = diagrecs(assoc->proto,
1257                 srs->errcode, srs->errstring);
1258         else
1259         {
1260             int i;
1261             static Z_Entries list;
1262
1263             if (srs->status == BEND_SCAN_PARTIAL)
1264                 scanStatus = Z_Scan_partial_5;
1265             else
1266                 scanStatus = Z_Scan_success;
1267             ents.which = Z_ListEntries_entries;
1268             ents.u.entries = &list;
1269             list.entries = tab;
1270             for (i = 0; i < srs->num_entries; i++)
1271             {
1272                 Z_Entry *e;
1273                 Z_TermInfo *t;
1274                 Odr_oct *o;
1275
1276                 if (i >= SCAN_MAX_ENTRIES)
1277                 {
1278                     scanStatus = Z_Scan_partial_4;
1279                     break;
1280                 }
1281                 list.entries[i] = e = odr_malloc(assoc->encode, sizeof(*e));
1282                 e->which = Z_Entry_termInfo;
1283                 e->u.termInfo = t = odr_malloc(assoc->encode, sizeof(*t));
1284                 t->suggestedAttributes = 0;
1285                 t->displayTerm = 0;
1286                 t->alternativeTerm = 0;
1287                 t->byAttributes = 0;
1288                 t->otherTermInfo = 0;
1289                 t->globalOccurrences = &srs->entries[i].occurrences;
1290                 t->term = odr_malloc(assoc->encode, sizeof(*t->term));
1291                 t->term->which = Z_Term_general;
1292                 t->term->u.general = o = odr_malloc(assoc->encode,
1293                     sizeof(Odr_oct));
1294                 o->buf = odr_malloc(assoc->encode, o->len = o->size =
1295                     strlen(srs->entries[i].term));
1296                 memcpy(o->buf, srs->entries[i].term, o->len);
1297                 logf(LOG_DEBUG, "  term #%d: '%s' (%d)", i,
1298                     srs->entries[i].term, srs->entries[i].occurrences);
1299             }
1300             list.num_entries = i;
1301             res.numberOfEntriesReturned = &list.num_entries;
1302             res.positionOfTerm = &srs->term_position;
1303         }
1304     }
1305
1306     return &apdu;
1307 }
1308
1309 static void process_close(association *assoc, request *reqb)
1310 {
1311     Z_Close *req = reqb->request->u.close;
1312     static char *reasons[] =
1313     {
1314         "finished",
1315         "shutdown",
1316         "systemProblem",
1317         "costLimit",
1318         "resources",
1319         "securityViolation",
1320         "protocolError",
1321         "lackOfActivity",
1322         "peerAbort",
1323         "unspecified"
1324     };
1325
1326     logf(LOG_LOG, "Got close, reason %s, message %s",
1327         reasons[*req->closeReason], req->diagnosticInformation ?
1328         req->diagnosticInformation : "NULL");
1329     if (assoc->version < 3) /* to make do_force respond with close */
1330         assoc->version = 3;
1331     do_close(assoc, Z_Close_finished, "Association terminated by client");
1332 }