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 1.65  1997-09-01 08:53:01  adam
   8  * New windows NT/95 port using MSV5.0. The test server 'ztest' was
   9  * moved a separate directory. MSV5.0 project server.dsp created.
  10  * As an option, the server can now operate as an NT service.
  11  *
  12  * Revision 1.64  1997/04/30 08:52:11  quinn
  13  * Null
  14  *
  15  * Revision 1.63  1996/10/11  11:57:26  quinn
  16  * Smallish
  17  *
  18  * Revision 1.62  1996/07/06  19:58:35  quinn
  19  * System headerfiles gathered in yconfig
  20  *
  21  * Revision 1.61  1996/06/10  08:56:16  quinn
  22  * Work on Summary.
  23  *
  24  * Revision 1.60  1996/05/30  11:03:10  quinn
  25  * Fixed NextresultSetPosition bug fixed.
  26  *
  27  * Revision 1.59  1996/05/14  09:26:46  quinn
  28  * Added attribute set to scan backend
  29  *
  30  * Revision 1.58  1996/02/20  12:53:04  quinn
  31  * Chanes to SCAN
  32  *
  33  * Revision 1.57  1996/01/02  08:57:47  quinn
  34  * Changed enums in the ASN.1 .h files to #defines. Changed oident.class to oclass
  35  *
  36  * Revision 1.56  1995/12/14  11:09:57  quinn
  37  * Work on Explain
  38  *
  39  * Revision 1.55  1995/11/08  17:41:37  quinn
  40  * Smallish.
  41  *
  42  * Revision 1.54  1995/11/08  15:11:29  quinn
  43  * Log of close transmit.
  44  *
  45  * Revision 1.53  1995/11/01  13:54:58  quinn
  46  * Minor adjustments
  47  *
  48  * Revision 1.52  1995/11/01  12:19:13  quinn
  49  * Second attempt to fix same bug.
  50  *
  51  * Revision 1.50  1995/10/25  16:58:32  quinn
  52  * Simple.
  53  *
  54  * Revision 1.49  1995/10/16  13:51:53  quinn
  55  * Changes to provide Especs to the backend.
  56  *
  57  * Revision 1.48  1995/10/06  08:51:20  quinn
  58  * Added Write-buffer.
  59  *
  60  * Revision 1.47  1995/08/29  14:24:16  quinn
  61  * Added second half of close-handshake
  62  *
  63  * Revision 1.46  1995/08/29  11:17:58  quinn
  64  * Added code to receive close
  65  *
  66  * Revision 1.45  1995/08/21  09:11:00  quinn
  67  * Smallish fixes to suppport new formats.
  68  *
  69  * Revision 1.44  1995/08/17  12:45:25  quinn
  70  * Fixed minor problems with GRS-1. Added support in c&s.
  71  *
  72  * Revision 1.43  1995/08/15  12:00:31  quinn
  73  * Updated External
  74  *
  75  * Revision 1.42  1995/08/15  11:16:50  quinn
  76  *
  77  * Revision 1.41  1995/08/02  10:23:06  quinn
  78  * Smallish
  79  *
  80  * Revision 1.40  1995/07/31  14:34:26  quinn
  81  * Fixed bug in process_searchResponse (numberOfRecordsReturned).
  82  *
  83  * Revision 1.39  1995/06/27  13:21:00  quinn
  84  * SUTRS support
  85  *
  86  * Revision 1.38  1995/06/19  12:39:11  quinn
  87  * Fixed bug in timeout code. Added BER dumper.
  88  *
  89  * Revision 1.37  1995/06/16  13:16:14  quinn
  90  * Fixed Defaultdiagformat.
  91  *
  92  * Revision 1.36  1995/06/16  10:31:36  quinn
  93  * Added session timeout.
  94  *
  95  * Revision 1.35  1995/06/15  07:45:14  quinn
  96  * Moving to v3.
  97  *
  98  * Revision 1.34  1995/06/14  15:26:46  quinn
  99  * *** empty log message ***
 100  *
 101  * Revision 1.33  1995/06/06  14:57:05  quinn
 102  * Better diagnostics.
 103  *
 104  * Revision 1.32  1995/06/06  08:41:44  quinn
 105  * Better diagnostics.
 106  *
 107  * Revision 1.31  1995/06/06  08:15:37  quinn
 108  * Cosmetic.
 109  *
 110  * Revision 1.30  1995/06/05  10:53:32  quinn
 111  * Added a better SCAN.
 112  *
 113  * Revision 1.29  1995/06/01  11:25:03  quinn
 114  * Smallish.
 115  *
 116  * Revision 1.28  1995/06/01  11:21:01  quinn
 117  * Attempting to fix a bug in pack-records. replaced break with continue
 118  * for large records, according to standard.
 119  *
 120  * Revision 1.27  1995/05/29  08:12:06  quinn
 121  * Moved oid to util
 122  *
 123  * Revision 1.26  1995/05/18  13:02:12  quinn
 124  * Smallish.
 125  *
 126  * Revision 1.25  1995/05/17  08:42:26  quinn
 127  * Transfer auth info to backend. Allow backend to reject init gracefully.
 128  *
 129  * Revision 1.24  1995/05/16  08:51:04  quinn
 130  * License, documentation, and memory fixes
 131  *
 132  * Revision 1.23  1995/05/15  13:25:10  quinn
 133  * Fixed memory bug.
 134  *
 135  * Revision 1.22  1995/05/15  11:56:39  quinn
 136  * Asynchronous facilities. Restructuring of seshigh code.
 137  *
 138  * Revision 1.21  1995/05/02  08:53:19  quinn
 139  * Trying in vain to fix comm with ISODE
 140  *
 141  * Revision 1.20  1995/04/20  15:13:00  quinn
 142  * Cosmetic
 143  *
 144  * Revision 1.19  1995/04/18  08:15:34  quinn
 145  * Added dynamic memory allocation on encoding (whew). Code is now somewhat
 146  * neater. We'll make the same change for decoding one day.
 147  *
 148  * Revision 1.18  1995/04/17  11:28:25  quinn
 149  * Smallish
 150  *
 151  * Revision 1.17  1995/04/10  10:23:36  quinn
 152  * Some work to add scan and other things.
 153  *
 154  * Revision 1.16  1995/03/31  09:18:55  quinn
 155  * Added logging.
 156  *
 157  * Revision 1.15  1995/03/30  14:03:23  quinn
 158  * Added RFC1006 as separate library
 159  *
 160  * Revision 1.14  1995/03/30  12:18:17  quinn
 161  * Fixed bug.
 162  *
 163  * Revision 1.13  1995/03/30  09:09:24  quinn
 164  * Added state-handle and some support for asynchronous activities.
 165  *
 166  * Revision 1.12  1995/03/29  15:40:16  quinn
 167  * Ongoing work. Statserv is now dynamic by default
 168  *
 169  * Revision 1.11  1995/03/28  09:16:21  quinn
 170  * Added record packing to the search request
 171  *
 172  * Revision 1.10  1995/03/27  08:34:24  quinn
 173  * Added dynamic server functionality.
 174  * Released bindings to session.c (is now redundant)
 175  *
 176  * Revision 1.9  1995/03/22  15:01:26  quinn
 177  * Adjusting record packing.
 178  *
 179  * Revision 1.8  1995/03/22  10:13:21  quinn
 180  * Working on record packer
 181  *
 182  * Revision 1.7  1995/03/21  15:53:31  quinn
 183  * Little changes.
 184  *
 185  * Revision 1.6  1995/03/21  12:30:09  quinn
 186  * Beginning to add support for record packing.
 187  *
 188  * Revision 1.5  1995/03/17  10:44:13  quinn
 189  * Added catch of null-string in makediagrec
 190  *
 191  * Revision 1.4  1995/03/17  10:18:08  quinn
 192  * Added memory management.
 193  *
 194  * Revision 1.3  1995/03/16  17:42:39  quinn
 195  * Little changes
 196  *
 197  * Revision 1.2  1995/03/16  13:29:01  quinn
 198  * Partitioned server.
 199  *
 200  * Revision 1.1  1995/03/15  16:02:10  quinn
 201  * Modded session.c to seshigh.c
 202  *
 203  */
 204
 205 /*
 206  * Frontend server logic.
 207  *
 208  * This code receives incoming APDUs, and handles client requests by means
 209  * of the backend API.
 210  *
 211  * Some of the code is getting quite involved, compared to simpler servers -
 212  * primarily because it is asynchronous both in the communication with
 213  * the user and the backend. We think the complexity will pay off in
 214  * the form of greater flexibility when more asynchronous facilities
 215  * are implemented.
 216  *
 217  * Memory management has become somewhat involved. In the simple case, where
 218  * only one PDU is pending at a time, it will simply reuse the same memory,
 219  * once it has found its working size. When we enable multiple concurrent
 220  * operations, perhaps even with multiple parallel calls to the backend, it
 221  * will maintain a pool of buffers for encoding and decoding, trying to
 222  * minimize memory allocation/deallocation during normal operation.
 223  *
 224  * TODOs include (and will be done in order of public interest):
 225  *
 226  * Support for EXPLAIN - provide simple meta-database system.
 227  * Support for access control.
 228  * Support for resource control.
 229  * Support for extended services - primarily Item Order.
 230  * Rest of Z39.50-1994
 231  *
 232  */
 233
 234 #include <yconfig.h>
 235 #include <stdlib.h>
 236 #include <stdio.h>
 237 #ifdef WINDOWS
 238 #include <process.h>
 239 #else
 240 #include <unistd.h>
 241 #endif
 242 #include <assert.h>
 243
 244 #include <xmalloc.h>
 245 #include <comstack.h>
 246 #include "eventl.h"
 247 #include "session.h"
 248 #include <proto.h>
 249 #include <oid.h>
 250 #include <log.h>
 251 #include <statserv.h>
 252
 253 #include <backend.h>
 254
 255 static int process_request(association *assoc);
 256 void backend_response(IOCHAN i, int event);
 257 static int process_response(association *assoc, request *req, Z_APDU *res);
 258 static Z_APDU *process_initRequest(association *assoc, request *reqb);
 259 static Z_APDU *process_searchRequest(association *assoc, request *reqb,
 260     int *fd);
 261 static Z_APDU *response_searchRequest(association *assoc, request *reqb,
 262     bend_searchresult *bsrt, int *fd);
 263 static Z_APDU *process_presentRequest(association *assoc, request *reqb,
 264     int *fd);
 265 static Z_APDU *process_scanRequest(association *assoc, request *reqb, int *fd);
 266 static void process_close(association *assoc, request *reqb);
 267
 268 static FILE *apduf = 0; /* for use in static mode */
 269 static statserv_options_block *control_block = 0;
 270
 271 /*
 272  * Create and initialize a new association-handle.
 273  *  channel  : iochannel for the current line.
 274  *  link     : communications channel.
 275  * Returns: 0 or a new association handle.
 276  */
 277 association *create_association(IOCHAN channel, COMSTACK link)
 278 {
 279     association *new;
 280
 281     if (!control_block)
 282         control_block = statserv_getcontrol();
 283     if (!(new = xmalloc(sizeof(*new))))
 284         return 0;
 285     new->client_chan = channel;
 286     new->client_link = link;
 287     if (!(new->decode = odr_createmem(ODR_DECODE)) ||
 288         !(new->encode = odr_createmem(ODR_ENCODE)))
 289         return 0;
 290     if (*control_block->apdufile)
 291     {
 292         char filename[256];
 293         FILE *f;
 294
 295         strcpy(filename, control_block->apdufile);
 296         if (!(new->print = odr_createmem(ODR_PRINT)))
 297             return 0;
 298         if (*control_block->apdufile != '-')
 299         {
 300             strcpy(filename, control_block->apdufile);
 301             if (!control_block->dynamic)
 302             {
 303                 if (!apduf)
 304                 {
 305                     if (!(apduf = fopen(filename, "w")))
 306                     {
 307                         logf(LOG_WARN|LOG_ERRNO, "%s", filename);
 308                         return 0;
 309                     }
 310                     setvbuf(apduf, 0, _IONBF, 0);
 311                 }
 312                 f = apduf;
 313             }
 314             else
 315             {
 316                 sprintf(filename + strlen(filename), ".%d", getpid());
 317                 if (!(f = fopen(filename, "w")))
 318                 {
 319                     logf(LOG_WARN|LOG_ERRNO, "%s", filename);
 320                     return 0;
 321                 }
 322                 setvbuf(f, 0, _IONBF, 0);
 323             }
 324             odr_setprint(new->print, f);
 325         }
 326     }
 327     else
 328         new->print = 0;
 329     new->input_buffer = 0;
 330     new->input_buffer_len = 0;
 331     new->backend = 0;
 332     new->state = ASSOC_NEW;
 333     request_initq(&new->incoming);
 334     request_initq(&new->outgoing);
 335     new->proto = cs_getproto(link);
 336     return new;
 337 }
 338
 339 /*
 340  * Free association and release resources.
 341  */
 342 void destroy_association(association *h)
 343 {
 344     odr_destroy(h->decode);
 345     odr_destroy(h->encode);
 346     if (h->print)
 347         odr_destroy(h->print);
 348     if (h->input_buffer)
 349     xfree(h->input_buffer);
 350     if (h->backend)
 351         bend_close(h->backend);
 352     while (request_deq(&h->incoming));
 353     while (request_deq(&h->outgoing));
 354     request_delq(&h->incoming);
 355     request_delq(&h->outgoing);
 356     xfree(h);
 357 }
 358
 359 static void do_close(association *a, int reason, char *message)
 360 {
 361     Z_APDU apdu;
 362     Z_Close *cls = zget_Close(a->encode);
 363     request *req = request_get(&a->outgoing);
 364
 365     /* Purge request queue */
 366     while (request_deq(&a->incoming));
 367     while (request_deq(&a->outgoing));
 368     if (a->version >= 3)
 369     {
 370         logf(LOG_LOG, "Sending Close PDU, reason=%d, message=%s",
 371             reason, message ? message : "none");
 372         apdu.which = Z_APDU_close;
 373         apdu.u.close = cls;
 374         *cls->closeReason = reason;
 375         cls->diagnosticInformation = message;
 376         process_response(a, req, &apdu);
 377         iochan_settimeout(a->client_chan, 60);
 378     }
 379     else
 380     {
 381         logf(LOG_DEBUG, "v2 client. No Close PDU");
 382         iochan_setevent(a->client_chan, EVENT_TIMEOUT); /* force imm close */
 383     }
 384     a->state = ASSOC_DEAD;
 385 }
 386
 387 /*
 388  * This is where PDUs from the client are read and the further
 389  * processing is initiated. Flow of control moves down through the
 390  * various process_* functions below, until the encoded result comes back up
 391  * to the output handler in here.
 392  *
 393  *  h     : the I/O channel that has an outstanding event.
 394  *  event : the current outstanding event.
 395  */
 396 void ir_session(IOCHAN h, int event)
 397 {
 398     int res;
 399     association *assoc = iochan_getdata(h);
 400     COMSTACK conn = assoc->client_link;
 401     request *req;
 402
 403     assert(h && conn && assoc);
 404     if (event == EVENT_TIMEOUT)
 405     {
 406         if (assoc->state != ASSOC_UP)
 407         {
 408             logf(LOG_LOG, "Final timeout - closing connection.");
 409             cs_close(conn);
 410             destroy_association(assoc);
 411             iochan_destroy(h);
 412         }
 413         else
 414         {
 415             logf(LOG_LOG, "Session idle too long. Sending close.");
 416             do_close(assoc, Z_Close_lackOfActivity, 0);
 417         }
 418         return;
 419     }
 420     if (event & EVENT_INPUT || event & EVENT_WORK) /* input */
 421     {
 422         if (event & EVENT_INPUT)
 423         {
 424             logf(LOG_DEBUG, "ir_session (input)");
 425             assert(assoc && conn);
 426             /* We aren't speaking to this fellow */
 427             if (assoc->state == ASSOC_DEAD)
 428             {
 429                 logf(LOG_LOG, "Closed connection after reject");
 430                 cs_close(conn);
 431                 destroy_association(assoc);
 432                 iochan_destroy(h);
 433                 return;
 434             }
 435             if ((res = cs_get(conn, &assoc->input_buffer,
 436                 &assoc->input_buffer_len)) <= 0)
 437             {
 438                 logf(LOG_LOG, "Connection closed by client");
 439                 cs_close(conn);
 440                 destroy_association(assoc);
 441                 iochan_destroy(h);
 442                 return;
 443             }
 444             else if (res == 1) /* incomplete read - wait for more  */
 445                 return;
 446             if (cs_more(conn)) /* more stuff - call us again later, please */
 447                 iochan_setevent(h, EVENT_INPUT);
 448
 449             /* we got a complete PDU. Let's decode it */
 450             logf(LOG_DEBUG, "Got PDU, %d bytes", res);
 451             req = request_get(&assoc->incoming); /* get a new request structure */
 452             odr_reset(assoc->decode);
 453             odr_setbuf(assoc->decode, assoc->input_buffer, res, 0);
 454             if (!z_APDU(assoc->decode, &req->request, 0))
 455             {
 456                 logf(LOG_LOG, "ODR error on incoming PDU: %s [near byte %d] ",
 457                     odr_errmsg(odr_geterror(assoc->decode)),
 458                     odr_offset(assoc->decode));
 459                 logf(LOG_LOG, "PDU dump:");
 460                 odr_dumpBER(log_file(), assoc->input_buffer, res);
 461                 do_close(assoc, Z_Close_protocolError, "Malformed package");
 462                 return;
 463             }
 464             req->request_mem = odr_extract_mem(assoc->decode);
 465             if (assoc->print && !z_APDU(assoc->print, &req->request, 0))
 466             {
 467                 logf(LOG_WARN, "ODR print error: %s",
 468                     odr_errmsg(odr_geterror(assoc->print)));
 469                 odr_reset(assoc->print);
 470             }
 471             request_enq(&assoc->incoming, req);
 472         }
 473
 474         /* can we do something yet? */
 475         req = request_head(&assoc->incoming);
 476         if (req->state == REQUEST_IDLE)
 477             if (process_request(assoc) < 0)
 478                 do_close(assoc, Z_Close_systemProblem, "Unknown error");
 479     }
 480     if (event & EVENT_OUTPUT)
 481     {
 482         request *req = request_head(&assoc->outgoing);
 483
 484         logf(LOG_DEBUG, "ir_session (output)");
 485         req->state = REQUEST_PENDING;
 486         switch (res = cs_put(conn, req->response, req->len_response))
 487         {
 488             case -1:
 489                 logf(LOG_LOG, "Connection closed by client");
 490                 cs_close(conn);
 491                 destroy_association(assoc);
 492                 iochan_destroy(h);
 493                 break;
 494             case 0: /* all sent - release the request structure */
 495                 logf(LOG_DEBUG, "Wrote PDU, %d bytes", req->len_response);
 496                 nmem_destroy(req->request_mem);
 497                 request_deq(&assoc->outgoing);
 498                 request_release(req);
 499                 if (!request_head(&assoc->outgoing))
 500                     iochan_clearflag(h, EVENT_OUTPUT);
 501                 break;
 502             /* value of 1 -- partial send -- is simply ignored */
 503         }
 504     }
 505     if (event & EVENT_EXCEPT)
 506     {
 507         logf(LOG_DEBUG, "ir_session (exception)");
 508         cs_close(conn);
 509         destroy_association(assoc);
 510         iochan_destroy(h);
 511     }
 512 }
 513
 514 /*
 515  * Initiate request processing.
 516  */
 517 static int process_request(association *assoc)
 518 {
 519     request *req = request_head(&assoc->incoming);
 520     int fd = -1;
 521     Z_APDU *res;
 522
 523     logf(LOG_DEBUG, "process_request");
 524     assert(req && req->state == REQUEST_IDLE);
 525     switch (req->request->which)
 526     {
 527         case Z_APDU_initRequest:
 528             res = process_initRequest(assoc, req); break;
 529         case Z_APDU_searchRequest:
 530             res = process_searchRequest(assoc, req, &fd); break;
 531         case Z_APDU_presentRequest:
 532             res = process_presentRequest(assoc, req, &fd); break;
 533         case Z_APDU_scanRequest:
 534             res = process_scanRequest(assoc, req, &fd); break;
 535         case Z_APDU_close:
 536             process_close(assoc, req); return 0;
 537         default:
 538             logf(LOG_WARN, "Bad APDU received");
 539             return -1;
 540     }
 541     if (res)
 542     {
 543         logf(LOG_DEBUG, "  result immediately available");
 544         return process_response(assoc, req, res);
 545     }
 546     else if (fd < 0)
 547     {
 548         logf(LOG_WARN, "   bad result");
 549         return -1;
 550     }
 551     else /* no result yet - one will be provided later */
 552     {
 553         IOCHAN chan;
 554
 555         /* Set up an I/O handler for the fd supplied by the backend */
 556
 557         logf(LOG_DEBUG, "   establishing handler for result");
 558         req->state = REQUEST_PENDING;
 559         if (!(chan = iochan_create(fd, backend_response, EVENT_INPUT)))
 560             abort();
 561         iochan_setdata(chan, assoc);
 562         return 0;
 563     }
 564 }
 565
 566 /*
 567  * Handle message from the backend.
 568  */
 569 void backend_response(IOCHAN i, int event)
 570 {
 571     association *assoc = iochan_getdata(i);
 572     request *req = request_head(&assoc->incoming);
 573     Z_APDU *res;
 574     int fd;
 575
 576     logf(LOG_DEBUG, "backend_response");
 577     assert(assoc && req && req->state != REQUEST_IDLE);
 578     /* determine what it is we're waiting for */
 579     switch (req->request->which)
 580     {
 581         case Z_APDU_searchRequest:
 582             res = response_searchRequest(assoc, req, 0, &fd); break;
 583 #if 0
 584         case Z_APDU_presentRequest:
 585             res = response_presentRequest(assoc, req, 0, &fd); break;
 586         case Z_APDU_scanRequest:
 587             res = response_scanRequest(assoc, req, 0, &fd); break;
 588 #endif
 589         default:
 590             logf(LOG_WARN, "Serious programmer's lapse or bug");
 591             abort();
 592     }
 593     if ((res && process_response(assoc, req, res) < 0) || fd < 0)
 594     {
 595         logf(LOG_LOG, "Fatal error when talking to backend");
 596         do_close(assoc, Z_Close_systemProblem, 0);
 597         iochan_destroy(i);
 598         return;
 599     }
 600     else if (!res) /* no result yet - try again later */
 601     {
 602         logf(LOG_DEBUG, "   no result yet");
 603         iochan_setfd(i, fd); /* in case fd has changed */
 604     }
 605 }
 606
 607 /*
 608  * Encode response, and transfer the request structure to the outgoing queue.
 609  */
 610 static int process_response(association *assoc, request *req, Z_APDU *res)
 611 {
 612     odr_setbuf(assoc->encode, req->response, req->size_response, 1);
 613     if (!z_APDU(assoc->encode, &res, 0))
 614     {
 615         logf(LOG_WARN, "ODR error when encoding response: %s",
 616             odr_errmsg(odr_geterror(assoc->decode)));
 617         odr_reset(assoc->encode);
 618         return -1;
 619     }
 620     req->response = odr_getbuf(assoc->encode, &req->len_response,
 621         &req->size_response);
 622     odr_setbuf(assoc->encode, 0, 0, 0); /* don'txfree if we abort later */
 623     odr_reset(assoc->encode);
 624     if (assoc->print && !z_APDU(assoc->print, &res, 0))
 625     {
 626         logf(LOG_WARN, "ODR print error: %s",
 627             odr_errmsg(odr_geterror(assoc->print)));
 628         odr_reset(assoc->print);
 629     }
 630     /* change this when we make the backend reentrant */
 631     if (req == request_head(&assoc->incoming))
 632     {
 633         req->state = REQUEST_IDLE;
 634         request_deq(&assoc->incoming);
 635     }
 636     request_enq(&assoc->outgoing, req);
 637     /* turn the work over to the ir_session handler */
 638     iochan_setflag(assoc->client_chan, EVENT_OUTPUT);
 639     /* Is there more work to be done? give that to the input handler too */
 640     if (request_head(&assoc->incoming))
 641         iochan_setevent(assoc->client_chan, EVENT_WORK);
 642     return 0;
 643 }
 644
 645 /*
 646  * Handle init request.
 647  * At the moment, we don't check the options
 648  * anywhere else in the code - we just try not to do anything that would
 649  * break a naive client. We'll toss 'em into the association block when
 650  * we need them there.
 651  */
 652 static Z_APDU *process_initRequest(association *assoc, request *reqb)
 653 {
 654     Z_InitRequest *req = reqb->request->u.initRequest;
 655     Z_APDU *apdu = zget_APDU(assoc->encode, Z_APDU_initResponse);
 656     Z_InitResponse *resp = apdu->u.initResponse;
 657     bend_initrequest binitreq;
 658     bend_initresult *binitres;
 659     char options[100];
 660
 661     logf(LOG_LOG, "Got initRequest");
 662     if (req->implementationId)
 663         logf(LOG_LOG, "Id:        %s", req->implementationId);
 664     if (req->implementationName)
 665         logf(LOG_LOG, "Name:      %s", req->implementationName);
 666     if (req->implementationVersion)
 667         logf(LOG_LOG, "Version:   %s", req->implementationVersion);
 668
 669     binitreq.configname = "default-config";
 670     binitreq.auth = req->idAuthentication;
 671     if (!(binitres = bend_init(&binitreq)))
 672     {
 673         logf(LOG_WARN, "Bad response from backend.");
 674         return 0;
 675     }
 676
 677     assoc->backend = binitres->handle;
 678     resp->referenceId = req->referenceId;
 679     *options = '\0';
 680     /* let's tell the client what we can do */
 681     if (ODR_MASK_GET(req->options, Z_Options_search))
 682     {
 683         ODR_MASK_SET(resp->options, Z_Options_search);
 684         strcat(options, "srch");
 685     }
 686     if (ODR_MASK_GET(req->options, Z_Options_present))
 687     {
 688         ODR_MASK_SET(resp->options, Z_Options_present);
 689         strcat(options, " prst");
 690     }
 691 #if 0
 692     if (ODR_MASK_GET(req->options, Z_Options_delSet))
 693     {
 694         ODR_MASK_SET(&options, Z_Options_delSet);
 695         strcat(options, " del");
 696     }
 697 #endif
 698     if (ODR_MASK_GET(req->options, Z_Options_namedResultSets))
 699     {
 700         ODR_MASK_SET(resp->options, Z_Options_namedResultSets);
 701         strcat(options, " namedresults");
 702     }
 703     if (ODR_MASK_GET(req->options, Z_Options_scan))
 704     {
 705         ODR_MASK_SET(resp->options, Z_Options_scan);
 706         strcat(options, " scan");
 707     }
 708     if (ODR_MASK_GET(req->options, Z_Options_concurrentOperations))
 709     {
 710         ODR_MASK_SET(resp->options, Z_Options_concurrentOperations);
 711         strcat(options, " concurop");
 712     }
 713
 714     if (ODR_MASK_GET(req->protocolVersion, Z_ProtocolVersion_1))
 715     {
 716         ODR_MASK_SET(resp->protocolVersion, Z_ProtocolVersion_1);
 717         assoc->version = 2; /* 1 & 2 are equivalent */
 718     }
 719     if (ODR_MASK_GET(req->protocolVersion, Z_ProtocolVersion_2))
 720     {
 721         ODR_MASK_SET(resp->protocolVersion, Z_ProtocolVersion_2);
 722         assoc->version = 2;
 723     }
 724     if (ODR_MASK_GET(req->protocolVersion, Z_ProtocolVersion_3))
 725     {
 726         ODR_MASK_SET(resp->protocolVersion, Z_ProtocolVersion_3);
 727         assoc->version = 3;
 728     }
 729     logf(LOG_LOG, "Negotiated to v%d: %s", assoc->version, options);
 730     assoc->maximumRecordSize = *req->maximumRecordSize;
 731     if (assoc->maximumRecordSize > control_block->maxrecordsize)
 732         assoc->maximumRecordSize = control_block->maxrecordsize;
 733     assoc->preferredMessageSize = *req->preferredMessageSize;
 734     if (assoc->preferredMessageSize > assoc->maximumRecordSize)
 735         assoc->preferredMessageSize = assoc->maximumRecordSize;
 736     resp->preferredMessageSize = &assoc->preferredMessageSize;
 737     resp->maximumRecordSize = &assoc->maximumRecordSize;
 738     resp->implementationName = "Index Data/YAZ Generic Frontend Server";
 739     if (binitres->errcode)
 740     {
 741         logf(LOG_LOG, "Connection rejected by backend.");
 742         *resp->result = 0;
 743         assoc->state = ASSOC_DEAD;
 744     }
 745     else
 746         assoc->state = ASSOC_UP;
 747     return apdu;
 748 }
 749
 750 /*
 751  * These functions should be merged.
 752  */
 753
 754 /*
 755  * nonsurrogate diagnostic record.
 756  */
 757 static Z_Records *diagrec(association *assoc, int error, char *addinfo)
 758 {
 759     Z_Records *rec = odr_malloc (assoc->encode, sizeof(*rec));
 760     oident bib1;
 761     int *err = odr_malloc (assoc->encode, sizeof(*err));
 762     Z_DiagRec *drec = odr_malloc (assoc->encode, sizeof(*drec));
 763     Z_DefaultDiagFormat *dr = odr_malloc (assoc->encode, sizeof(*dr));
 764
 765     bib1.proto = assoc->proto;
 766     bib1.oclass = CLASS_DIAGSET;
 767     bib1.value = VAL_BIB1;
 768
 769     logf(LOG_DEBUG, "Diagnostic: %d -- %s", error, addinfo ? addinfo :
 770         "NULL");
 771     *err = error;
 772     rec->which = Z_Records_NSD;
 773 #ifdef Z_95
 774     rec->u.nonSurrogateDiagnostic = drec;
 775     drec->which = Z_DiagRec_defaultFormat;
 776     drec->u.defaultFormat = dr;
 777 #else
 778     rec->u.nonSurrogateDiagnostic = dr;
 779 #endif
 780     dr->diagnosticSetId = oid_getoidbyent(&bib1);
 781     dr->condition = err;
 782     dr->which = Z_DiagForm_v2AddInfo;
 783     dr->addinfo = addinfo ? addinfo : "";
 784     return rec;
 785 }
 786
 787 /*
 788  * surrogate diagnostic.
 789  */
 790 static Z_NamePlusRecord *surrogatediagrec(association *assoc, char *dbname,
 791                                             int error, char *addinfo)
 792 {
 793     Z_NamePlusRecord *rec = odr_malloc (assoc->encode, sizeof(*rec));
 794     int *err = odr_malloc (assoc->encode, sizeof(*err));
 795     oident bib1;
 796     Z_DiagRec *drec = odr_malloc (assoc->encode, sizeof(*drec));
 797     Z_DefaultDiagFormat *dr = odr_malloc (assoc->encode, sizeof(*dr));
 798
 799     bib1.proto = assoc->proto;
 800     bib1.oclass = CLASS_DIAGSET;
 801     bib1.value = VAL_BIB1;
 802
 803     logf(LOG_DEBUG, "SurrogateDiagnotic: %d -- %s", error, addinfo);
 804     *err = error;
 805     rec->databaseName = dbname;
 806     rec->which = Z_NamePlusRecord_surrogateDiagnostic;
 807     rec->u.surrogateDiagnostic = drec;
 808     drec->which = Z_DiagRec_defaultFormat;
 809     drec->u.defaultFormat = dr;
 810     dr->diagnosticSetId = oid_getoidbyent(&bib1);
 811     dr->condition = err;
 812     dr->which = Z_DiagForm_v2AddInfo;
 813     dr->addinfo = addinfo ? addinfo : "";
 814     return rec;
 815 }
 816
 817 /*
 818  * multiple nonsurrogate diagnostics.
 819  */
 820 static Z_DiagRecs *diagrecs(association *assoc, int error, char *addinfo)
 821 {
 822     Z_DiagRecs *recs = odr_malloc (assoc->encode, sizeof(*recs));
 823     int *err = odr_malloc (assoc->encode, sizeof(*err));
 824     oident bib1;
 825     Z_DiagRec **recp = odr_malloc (assoc->encode, sizeof(*recp));
 826     Z_DiagRec *drec = odr_malloc (assoc->encode, sizeof(*drec));
 827     Z_DefaultDiagFormat *rec = odr_malloc (assoc->encode, sizeof(*rec));
 828
 829     logf(LOG_DEBUG, "DiagRecs: %d -- %s", error, addinfo);
 830     bib1.proto = assoc->proto;
 831     bib1.oclass = CLASS_DIAGSET;
 832     bib1.value = VAL_BIB1;
 833
 834     *err = error;
 835     recs->num_diagRecs = 1;
 836     recs->diagRecs = recp;
 837     recp[0] = drec;
 838     drec->which = Z_DiagRec_defaultFormat;
 839     drec->u.defaultFormat = rec;
 840
 841     rec->diagnosticSetId = oid_getoidbyent(&bib1);
 842     rec->condition = err;
 843     rec->which = Z_DiagForm_v2AddInfo;
 844     rec->addinfo = addinfo ? addinfo : "";
 845     return recs;
 846 }
 847
 848 static Z_Records *pack_records(association *a, char *setname, int start,
 849                                 int *num, Z_RecordComposition *comp,
 850                                 int *next, int *pres, oid_value format)
 851 {
 852     int recno, total_length = 0, toget = *num, dumped_records = 0;
 853     Z_Records *records = odr_malloc (a->encode, sizeof(*records));
 854     Z_NamePlusRecordList *reclist = odr_malloc (a->encode, sizeof(*reclist));
 855     Z_NamePlusRecord **list = odr_malloc (a->encode, sizeof(*list) * toget);
 856     oident recform;
 857
 858     records->which = Z_Records_DBOSD;
 859     records->u.databaseOrSurDiagnostics = reclist;
 860     reclist->num_records = 0;
 861     reclist->records = list;
 862     *pres = Z_PRES_SUCCESS;
 863     *num = 0;
 864     *next = 0;
 865
 866     logf(LOG_DEBUG, "Request to pack %d+%d", start, toget);
 867     logf(LOG_DEBUG, "pms=%d, mrs=%d", a->preferredMessageSize,
 868         a->maximumRecordSize);
 869     for (recno = start; reclist->num_records < toget; recno++)
 870     {
 871         bend_fetchrequest freq;
 872         bend_fetchresult *fres;
 873         Z_NamePlusRecord *thisrec;
 874         Z_DatabaseRecord *thisext;
 875         int this_length;
 876
 877         /*
 878          * we get the number of bytes allocated on the stream before any
 879          * allocation done by the backend - this should give us a reasonable
 880          * idea of the total size of the data so far.
 881          */
 882         total_length = odr_total(a->encode) - dumped_records;
 883         freq.setname = setname;
 884         freq.number = recno;
 885         freq.comp = comp;
 886         freq.format = format;
 887         freq.stream = a->encode;
 888         if (!(fres = bend_fetch(a->backend, &freq, 0)))
 889         {
 890             *pres = Z_PRES_FAILURE;
 891             return diagrec(a, 2, "Backend interface problem");
 892         }
 893         /* backend should be able to signal whether error is system-wide
 894            or only pertaining to current record */
 895         if (fres->errcode)
 896         {
 897             *pres = Z_PRES_FAILURE;
 898             return diagrec(a, fres->errcode, fres->errstring);
 899         }
 900         if (fres->len >= 0)
 901             this_length = fres->len;
 902         else
 903             this_length = odr_total(a->encode) - total_length;
 904         logf(LOG_DEBUG, "  fetched record, len=%d, total=%d",
 905             this_length, total_length);
 906         if (this_length + total_length > a->preferredMessageSize)
 907         {
 908             /* record is small enough, really */
 909             if (this_length <= a->preferredMessageSize)
 910             {
 911                 logf(LOG_DEBUG, "  Dropped last normal-sized record");
 912                 *pres = Z_PRES_PARTIAL_2;
 913                 break;
 914             }
 915             /* record can only be fetched by itself */
 916             if (this_length < a->maximumRecordSize)
 917             {
 918                 logf(LOG_DEBUG, "  Record > prefmsgsz");
 919                 if (toget > 1)
 920                 {
 921                     logf(LOG_DEBUG, "  Dropped it");
 922                     reclist->records[reclist->num_records] =
 923                          surrogatediagrec(a, fres->basename, 16, 0);
 924                     reclist->num_records++;
 925                     *next = fres->last_in_set ? 0 : recno + 1;
 926                     dumped_records += this_length;
 927                     continue;
 928                 }
 929             }
 930             else /* too big entirely */
 931             {
 932                 logf(LOG_DEBUG, "Record > maxrcdsz");
 933                 reclist->records[reclist->num_records] =
 934                     surrogatediagrec(a, fres->basename, 17, 0);
 935                 reclist->num_records++;
 936                 *next = fres->last_in_set ? 0 : recno + 1;
 937                 dumped_records += this_length;
 938                 continue;
 939             }
 940         }
 941         if (!(thisrec = odr_malloc(a->encode, sizeof(*thisrec))))
 942             return 0;
 943         if (!(thisrec->databaseName = odr_malloc(a->encode,
 944             strlen(fres->basename) + 1)))
 945             return 0;
 946         strcpy(thisrec->databaseName, fres->basename);
 947         thisrec->which = Z_NamePlusRecord_databaseRecord;
 948         if (!(thisrec->u.databaseRecord = thisext = odr_malloc(a->encode,
 949             sizeof(Z_DatabaseRecord))))
 950             return 0;
 951         recform.proto = a->proto;
 952         recform.oclass = CLASS_RECSYN;
 953         recform.value = fres->format;
 954         thisext->direct_reference = odr_oiddup(a->encode,
 955             oid_getoidbyent(&recform));
 956         thisext->indirect_reference = 0;
 957         thisext->descriptor = 0;
 958         if (fres->len < 0) /* Structured data */
 959         {
 960             switch (fres->format)
 961             {
 962                 case VAL_SUTRS: thisext->which = Z_External_sutrs; break;
 963                 case VAL_GRS1: thisext->which = Z_External_grs1; break;
 964                 case VAL_EXPLAIN: thisext->which = Z_External_explainRecord;
 965                     break;
 966                 case VAL_SUMMARY: thisext->which = Z_External_summary; break;
 967                 case VAL_OPAC: thisext->which = Z_External_OPAC; break;
 968
 969                 default:
 970                     logf(LOG_FATAL, "Unknown structured format from backend.");
 971                     return 0;
 972             }
 973
 974             /*
 975              * We cheat on the pointers here. Obviously, the record field
 976              * of the backend-fetch structure should have been a union for
 977              * correctness, but we're stuck with this for backwards
 978              * compatibility.
 979              */
 980             thisext->u.grs1 = (Z_GenericRecord*) fres->record;
 981         }
 982         else if (fres->format == VAL_SUTRS) /* SUTRS is a single-ASN.1-type */
 983         {
 984             Odr_oct *sutrs = odr_malloc(a->encode, sizeof(*sutrs));
 985
 986             thisext->which = Z_External_sutrs;
 987             thisext->u.sutrs = sutrs;
 988             sutrs->buf = odr_malloc(a->encode, fres->len);
 989             sutrs->len = sutrs->size = fres->len;
 990             memcpy(sutrs->buf, fres->record, fres->len);
 991         }
 992         else /* octet-aligned record. */
 993         {
 994             thisext->which = Z_External_octet;
 995             if (!(thisext->u.octet_aligned = odr_malloc(a->encode,
 996                 sizeof(Odr_oct))))
 997                 return 0;
 998             if (!(thisext->u.octet_aligned->buf = odr_malloc(a->encode,
 999                 fres->len)))
1000                 return 0;
1001             memcpy(thisext->u.octet_aligned->buf, fres->record, fres->len);
1002             thisext->u.octet_aligned->len = thisext->u.octet_aligned->size =
1003                 fres->len;
1004         }
1005         reclist->records[reclist->num_records] = thisrec;
1006         reclist->num_records++;
1007         *next = fres->last_in_set ? 0 : recno + 1;
1008     }
1009     *num = reclist->num_records;
1010     return records;
1011 }
1012
1013 static Z_APDU *process_searchRequest(association *assoc, request *reqb,
1014     int *fd)
1015 {
1016     Z_SearchRequest *req = reqb->request->u.searchRequest;
1017     bend_searchrequest bsrq;
1018     bend_searchresult *bsrt;
1019
1020     logf(LOG_LOG, "Got SearchRequest.");
1021
1022     bsrq.setname = req->resultSetName;
1023     bsrq.replace_set = *req->replaceIndicator;
1024     bsrq.num_bases = req->num_databaseNames;
1025     bsrq.basenames = req->databaseNames;
1026     bsrq.query = req->query;
1027
1028     if (!(bsrt = bend_search(assoc->backend, &bsrq, fd)))
1029         return 0;
1030     return response_searchRequest(assoc, reqb, bsrt, fd);
1031 }
1032
1033 bend_searchresult *bend_searchresponse(void *handle) {return 0;}
1034
1035 /*
1036  * Prepare a searchresponse based on the backend results. We probably want
1037  * to look at making the fetching of records nonblocking as well, but
1038  * so far, we'll keep things simple.
1039  * If bsrt is null, that means we're called in response to a communications
1040  * event, and we'll have to get the response for ourselves.
1041  */
1042 static Z_APDU *response_searchRequest(association *assoc, request *reqb,
1043     bend_searchresult *bsrt, int *fd)
1044 {
1045     Z_SearchRequest *req = reqb->request->u.searchRequest;
1046     Z_APDU *apdu = odr_malloc (assoc->encode, sizeof(*apdu));
1047     Z_SearchResponse *resp = odr_malloc (assoc->encode, sizeof(*resp));
1048     int *nulint = odr_malloc (assoc->encode, sizeof(*nulint));
1049     bool_t *sr = odr_malloc (assoc->encode, sizeof(*sr));
1050     int *next = odr_malloc (assoc->encode, sizeof(*next));
1051     int *none = odr_malloc (assoc->encode, sizeof(*none));
1052
1053     *nulint = 0;
1054     *sr = 1;
1055     *next = 0;
1056     *none = Z_RES_NONE;
1057
1058     apdu->which = Z_APDU_searchResponse;
1059     apdu->u.searchResponse = resp;
1060     resp->referenceId = req->referenceId;
1061     resp->additionalSearchInfo = 0;
1062     resp->otherInfo = 0;
1063     *fd = -1;
1064     if (!bsrt && !(bsrt = bend_searchresponse(assoc->backend)))
1065     {
1066         logf(LOG_FATAL, "Bad result from backend");
1067         return 0;
1068     }
1069     else if (bsrt->errcode)
1070     {
1071         resp->records = diagrec(assoc, bsrt->errcode, bsrt->errstring);
1072         resp->resultCount = nulint;
1073         resp->numberOfRecordsReturned = nulint;
1074         resp->nextResultSetPosition = nulint;
1075         resp->searchStatus = nulint;
1076         resp->resultSetStatus = none;
1077         resp->presentStatus = 0;
1078     }
1079     else
1080     {
1081         int *toget = odr_malloc (assoc->encode, sizeof(*toget));
1082         int *presst = odr_malloc (assoc->encode, sizeof(*presst));
1083         Z_RecordComposition comp, *compp = 0;
1084
1085         *toget = 0;
1086         *presst = 0;
1087         resp->records = 0;
1088         resp->resultCount = &bsrt->hits;
1089
1090         comp.which = Z_RecordComp_simple;
1091         /* how many records does the user agent want, then? */
1092         if (bsrt->hits <= *req->smallSetUpperBound)
1093         {
1094             *toget = bsrt->hits;
1095             if ((comp.u.simple = req->smallSetElementSetNames))
1096                 compp = &comp;
1097         }
1098         else if (bsrt->hits < *req->largeSetLowerBound)
1099         {
1100             *toget = *req->mediumSetPresentNumber;
1101             if (*toget > bsrt->hits)
1102                 *toget = bsrt->hits;
1103             if ((comp.u.simple = req->mediumSetElementSetNames))
1104                 compp = &comp;
1105         }
1106         else
1107             *toget = 0;
1108
1109         if (*toget && !resp->records)
1110         {
1111             oident *prefformat;
1112             oid_value form;
1113
1114             if (!(prefformat = oid_getentbyoid(req->preferredRecordSyntax)) ||
1115                 prefformat->oclass != CLASS_RECSYN)
1116                 form = VAL_NONE;
1117             else
1118                 form = prefformat->value;
1119             resp->records = pack_records(assoc, req->resultSetName, 1,
1120                 toget, compp, next, presst, form);
1121             if (!resp->records)
1122                 return 0;
1123             resp->numberOfRecordsReturned = toget;
1124             resp->nextResultSetPosition = next;
1125             resp->searchStatus = sr;
1126             resp->resultSetStatus = 0;
1127             resp->presentStatus = presst;
1128         }
1129         else
1130         {
1131             if (*resp->resultCount)
1132                 *next = 1;
1133             resp->numberOfRecordsReturned = nulint;
1134             resp->nextResultSetPosition = next;
1135             resp->searchStatus = sr;
1136             resp->resultSetStatus = 0;
1137             resp->presentStatus = 0;
1138         }
1139     }
1140     return apdu;
1141 }
1142
1143 /*
1144  * Maybe we got a little over-friendly when we designed bend_fetch to
1145  * get only one record at a time. Some backends can optimise multiple-record
1146  * fetches, and at any rate, there is some overhead involved in
1147  * all that selecting and hopping around. Problem is, of course, that the
1148  * frontend can't know ahead of time how many records it'll need to
1149  * fill the negotiated PDU size. Annoying. Segmentation or not, Z/SR
1150  * is downright lousy as a bulk data transfer protocol.
1151  *
1152  * To start with, we'll do the fetching of records from the backend
1153  * in one operation: To save some trips in and out of the event-handler,
1154  * and to simplify the interface to pack_records. At any rate, asynch
1155  * operation is more fun in operations that have an unpredictable execution
1156  * speed - which is normally more true for search than for present.
1157  */
1158 static Z_APDU *process_presentRequest(association *assoc, request *reqb,
1159     int *fd)
1160 {
1161     Z_PresentRequest *req = reqb->request->u.presentRequest;
1162     Z_APDU *apdu = odr_malloc (assoc->encode, sizeof(*apdu));
1163     Z_PresentResponse *resp = odr_malloc (assoc->encode, sizeof(*resp));
1164     int *presst = odr_malloc (assoc->encode, sizeof(*presst));
1165     int *next = odr_malloc (assoc->encode, sizeof(*next));
1166     int *num = odr_malloc (assoc->encode, sizeof(*num));
1167     oident *prefformat;
1168     oid_value form;
1169
1170     logf(LOG_LOG, "Got PresentRequest.");
1171     *presst = 0;
1172     *next = 0;
1173     *num = 0;
1174
1175     apdu->which = Z_APDU_presentResponse;
1176     apdu->u.presentResponse = resp;
1177     resp->referenceId = req->referenceId;
1178     resp->otherInfo = 0;
1179
1180     if (!(prefformat = oid_getentbyoid(req->preferredRecordSyntax)) ||
1181         prefformat->oclass != CLASS_RECSYN)
1182         form = VAL_NONE;
1183     else
1184         form = prefformat->value;
1185     *num = *req->numberOfRecordsRequested;
1186     resp->records = pack_records(assoc, req->resultSetId,
1187         *req->resultSetStartPoint, num, req->recordComposition, next,
1188         presst, form);
1189     if (!resp->records)
1190         return 0;
1191     resp->numberOfRecordsReturned = num;
1192     resp->presentStatus = presst;
1193     resp->nextResultSetPosition = next;
1194
1195     return apdu;
1196 }
1197
1198 /*
1199  * Scan was implemented rather in a hurry, and with support for only the basic
1200  * elements of the service in the backend API. Suggestions are welcome.
1201  */
1202 static Z_APDU *process_scanRequest(association *assoc, request *reqb, int *fd)
1203 {
1204     Z_ScanRequest *req = reqb->request->u.scanRequest;
1205     Z_APDU *apdu = odr_malloc (assoc->encode, sizeof(*apdu));
1206     Z_ScanResponse *res = odr_malloc (assoc->encode, sizeof(*res));
1207     int *scanStatus = odr_malloc (assoc->encode, sizeof(*scanStatus));
1208     int *numberOfEntriesReturned =
1209          odr_malloc (assoc->encode, sizeof(*numberOfEntriesReturned));
1210     Z_ListEntries *ents = odr_malloc (assoc->encode, sizeof(*ents));
1211     oident *attent;
1212     bend_scanrequest srq;
1213     bend_scanresult *srs;
1214     oident *attset;
1215
1216     logf(LOG_LOG, "Got scanrequest");
1217     *scanStatus = Z_Scan_failure;
1218     *numberOfEntriesReturned = 0;
1219
1220     apdu->which = Z_APDU_scanResponse;
1221     apdu->u.scanResponse = res;
1222     res->referenceId = req->referenceId;
1223     res->stepSize = 0;
1224     res->scanStatus = scanStatus;
1225     res->numberOfEntriesReturned = numberOfEntriesReturned;
1226     res->positionOfTerm = 0;
1227     res->entries = ents;
1228     ents->which = Z_ListEntries_nonSurrogateDiagnostics;
1229     res->attributeSet = 0;
1230     res->otherInfo = 0;
1231
1232     if (req->attributeSet && (!(attent = oid_getentbyoid(req->attributeSet)) ||
1233         attent->oclass != CLASS_ATTSET || attent->value != VAL_BIB1))
1234         ents->u.nonSurrogateDiagnostics = diagrecs(assoc, 121, 0);
1235     else if (req->stepSize && *req->stepSize > 0)
1236         ents->u.nonSurrogateDiagnostics = diagrecs(assoc, 205, 0);
1237     else
1238     {
1239         if (req->termListAndStartPoint->term->which == Z_Term_general)
1240             logf(LOG_DEBUG, " term: '%.*s'",
1241                 req->termListAndStartPoint->term->u.general->len,
1242                 req->termListAndStartPoint->term->u.general->buf);
1243         srq.num_bases = req->num_databaseNames;
1244         srq.basenames = req->databaseNames;
1245         srq.num_entries = *req->numberOfTermsRequested;
1246         srq.term = req->termListAndStartPoint;
1247         if (!(attset = oid_getentbyoid(req->attributeSet)) ||
1248             attset->oclass != CLASS_RECSYN)
1249             srq.attributeset = VAL_NONE;
1250         else
1251             srq.attributeset = attset->value;
1252         srq.term_position = req->preferredPositionInResponse ?
1253             *req->preferredPositionInResponse : 1;
1254         if (!(srs = bend_scan(assoc->backend, &srq, 0)))
1255             ents->u.nonSurrogateDiagnostics = diagrecs(assoc, 2, 0);
1256         else if (srs->errcode)
1257             ents->u.nonSurrogateDiagnostics = diagrecs(assoc,
1258                 srs->errcode, srs->errstring);
1259         else
1260         {
1261             int i;
1262             Z_Entries *list = odr_malloc (assoc->encode, sizeof(*list));
1263             Z_Entry **tab = odr_malloc (assoc->encode,
1264                                         sizeof(*tab) * srs->num_entries);
1265
1266             if (srs->status == BEND_SCAN_PARTIAL)
1267                 *scanStatus = Z_Scan_partial_5;
1268             else
1269                 *scanStatus = Z_Scan_success;
1270             ents->which = Z_ListEntries_entries;
1271             ents->u.entries = list;
1272             list->entries = tab;
1273             for (i = 0; i < srs->num_entries; i++)
1274             {
1275                 Z_Entry *e;
1276                 Z_TermInfo *t;
1277                 Odr_oct *o;
1278
1279                 list->entries[i] = e = odr_malloc(assoc->encode, sizeof(*e));
1280                 e->which = Z_Entry_termInfo;
1281                 e->u.termInfo = t = odr_malloc(assoc->encode, sizeof(*t));
1282                 t->suggestedAttributes = 0;
1283                 t->displayTerm = 0;
1284                 t->alternativeTerm = 0;
1285                 t->byAttributes = 0;
1286                 t->otherTermInfo = 0;
1287                 t->globalOccurrences = &srs->entries[i].occurrences;
1288                 t->term = odr_malloc(assoc->encode, sizeof(*t->term));
1289                 t->term->which = Z_Term_general;
1290                 t->term->u.general = o = odr_malloc(assoc->encode,
1291                     sizeof(Odr_oct));
1292                 o->buf = odr_malloc(assoc->encode, o->len = o->size =
1293                     strlen(srs->entries[i].term));
1294                 memcpy(o->buf, srs->entries[i].term, o->len);
1295                 logf(LOG_DEBUG, "  term #%d: '%s' (%d)", i,
1296                     srs->entries[i].term, srs->entries[i].occurrences);
1297             }
1298             list->num_entries = i;
1299             res->numberOfEntriesReturned = &list->num_entries;
1300             res->positionOfTerm = &srs->term_position;
1301         }
1302     }
1303
1304     return apdu;
1305 }
1306
1307 static void process_close(association *assoc, request *reqb)
1308 {
1309     Z_Close *req = reqb->request->u.close;
1310     static char *reasons[] =
1311     {
1312         "finished",
1313         "shutdown",
1314         "systemProblem",
1315         "costLimit",
1316         "resources",
1317         "securityViolation",
1318         "protocolError",
1319         "lackOfActivity",
1320         "peerAbort",
1321         "unspecified"
1322     };
1323
1324     logf(LOG_LOG, "Got close, reason %s, message %s",
1325         reasons[*req->closeReason], req->diagnosticInformation ?
1326         req->diagnosticInformation : "NULL");
1327     if (assoc->version < 3) /* to make do_force respond with close */
1328         assoc->version = 3;
1329     do_close(assoc, Z_Close_finished, "Association terminated by client");
1330 }