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 1.64  1997-04-30 08:52:11  quinn
   8  * Null
   9  *
  10  * Revision 1.63  1996/10/11  11:57:26  quinn
  11  * Smallish
  12  *
  13  * Revision 1.62  1996/07/06  19:58:35  quinn
  14  * System headerfiles gathered in yconfig
  15  *
  16  * Revision 1.61  1996/06/10  08:56:16  quinn
  17  * Work on Summary.
  18  *
  19  * Revision 1.60  1996/05/30  11:03:10  quinn
  20  * Fixed NextresultSetPosition bug fixed.
  21  *
  22  * Revision 1.59  1996/05/14  09:26:46  quinn
  23  * Added attribute set to scan backend
  24  *
  25  * Revision 1.58  1996/02/20  12:53:04  quinn
  26  * Chanes to SCAN
  27  *
  28  * Revision 1.57  1996/01/02  08:57:47  quinn
  29  * Changed enums in the ASN.1 .h files to #defines. Changed oident.class to oclass
  30  *
  31  * Revision 1.56  1995/12/14  11:09:57  quinn
  32  * Work on Explain
  33  *
  34  * Revision 1.55  1995/11/08  17:41:37  quinn
  35  * Smallish.
  36  *
  37  * Revision 1.54  1995/11/08  15:11:29  quinn
  38  * Log of close transmit.
  39  *
  40  * Revision 1.53  1995/11/01  13:54:58  quinn
  41  * Minor adjustments
  42  *
  43  * Revision 1.52  1995/11/01  12:19:13  quinn
  44  * Second attempt to fix same bug.
  45  *
  46  * Revision 1.50  1995/10/25  16:58:32  quinn
  47  * Simple.
  48  *
  49  * Revision 1.49  1995/10/16  13:51:53  quinn
  50  * Changes to provide Especs to the backend.
  51  *
  52  * Revision 1.48  1995/10/06  08:51:20  quinn
  53  * Added Write-buffer.
  54  *
  55  * Revision 1.47  1995/08/29  14:24:16  quinn
  56  * Added second half of close-handshake
  57  *
  58  * Revision 1.46  1995/08/29  11:17:58  quinn
  59  * Added code to receive close
  60  *
  61  * Revision 1.45  1995/08/21  09:11:00  quinn
  62  * Smallish fixes to suppport new formats.
  63  *
  64  * Revision 1.44  1995/08/17  12:45:25  quinn
  65  * Fixed minor problems with GRS-1. Added support in c&s.
  66  *
  67  * Revision 1.43  1995/08/15  12:00:31  quinn
  68  * Updated External
  69  *
  70  * Revision 1.42  1995/08/15  11:16:50  quinn
  71  *
  72  * Revision 1.41  1995/08/02  10:23:06  quinn
  73  * Smallish
  74  *
  75  * Revision 1.40  1995/07/31  14:34:26  quinn
  76  * Fixed bug in process_searchResponse (numberOfRecordsReturned).
  77  *
  78  * Revision 1.39  1995/06/27  13:21:00  quinn
  79  * SUTRS support
  80  *
  81  * Revision 1.38  1995/06/19  12:39:11  quinn
  82  * Fixed bug in timeout code. Added BER dumper.
  83  *
  84  * Revision 1.37  1995/06/16  13:16:14  quinn
  85  * Fixed Defaultdiagformat.
  86  *
  87  * Revision 1.36  1995/06/16  10:31:36  quinn
  88  * Added session timeout.
  89  *
  90  * Revision 1.35  1995/06/15  07:45:14  quinn
  91  * Moving to v3.
  92  *
  93  * Revision 1.34  1995/06/14  15:26:46  quinn
  94  * *** empty log message ***
  95  *
  96  * Revision 1.33  1995/06/06  14:57:05  quinn
  97  * Better diagnostics.
  98  *
  99  * Revision 1.32  1995/06/06  08:41:44  quinn
 100  * Better diagnostics.
 101  *
 102  * Revision 1.31  1995/06/06  08:15:37  quinn
 103  * Cosmetic.
 104  *
 105  * Revision 1.30  1995/06/05  10:53:32  quinn
 106  * Added a better SCAN.
 107  *
 108  * Revision 1.29  1995/06/01  11:25:03  quinn
 109  * Smallish.
 110  *
 111  * Revision 1.28  1995/06/01  11:21:01  quinn
 112  * Attempting to fix a bug in pack-records. replaced break with continue
 113  * for large records, according to standard.
 114  *
 115  * Revision 1.27  1995/05/29  08:12:06  quinn
 116  * Moved oid to util
 117  *
 118  * Revision 1.26  1995/05/18  13:02:12  quinn
 119  * Smallish.
 120  *
 121  * Revision 1.25  1995/05/17  08:42:26  quinn
 122  * Transfer auth info to backend. Allow backend to reject init gracefully.
 123  *
 124  * Revision 1.24  1995/05/16  08:51:04  quinn
 125  * License, documentation, and memory fixes
 126  *
 127  * Revision 1.23  1995/05/15  13:25:10  quinn
 128  * Fixed memory bug.
 129  *
 130  * Revision 1.22  1995/05/15  11:56:39  quinn
 131  * Asynchronous facilities. Restructuring of seshigh code.
 132  *
 133  * Revision 1.21  1995/05/02  08:53:19  quinn
 134  * Trying in vain to fix comm with ISODE
 135  *
 136  * Revision 1.20  1995/04/20  15:13:00  quinn
 137  * Cosmetic
 138  *
 139  * Revision 1.19  1995/04/18  08:15:34  quinn
 140  * Added dynamic memory allocation on encoding (whew). Code is now somewhat
 141  * neater. We'll make the same change for decoding one day.
 142  *
 143  * Revision 1.18  1995/04/17  11:28:25  quinn
 144  * Smallish
 145  *
 146  * Revision 1.17  1995/04/10  10:23:36  quinn
 147  * Some work to add scan and other things.
 148  *
 149  * Revision 1.16  1995/03/31  09:18:55  quinn
 150  * Added logging.
 151  *
 152  * Revision 1.15  1995/03/30  14:03:23  quinn
 153  * Added RFC1006 as separate library
 154  *
 155  * Revision 1.14  1995/03/30  12:18:17  quinn
 156  * Fixed bug.
 157  *
 158  * Revision 1.13  1995/03/30  09:09:24  quinn
 159  * Added state-handle and some support for asynchronous activities.
 160  *
 161  * Revision 1.12  1995/03/29  15:40:16  quinn
 162  * Ongoing work. Statserv is now dynamic by default
 163  *
 164  * Revision 1.11  1995/03/28  09:16:21  quinn
 165  * Added record packing to the search request
 166  *
 167  * Revision 1.10  1995/03/27  08:34:24  quinn
 168  * Added dynamic server functionality.
 169  * Released bindings to session.c (is now redundant)
 170  *
 171  * Revision 1.9  1995/03/22  15:01:26  quinn
 172  * Adjusting record packing.
 173  *
 174  * Revision 1.8  1995/03/22  10:13:21  quinn
 175  * Working on record packer
 176  *
 177  * Revision 1.7  1995/03/21  15:53:31  quinn
 178  * Little changes.
 179  *
 180  * Revision 1.6  1995/03/21  12:30:09  quinn
 181  * Beginning to add support for record packing.
 182  *
 183  * Revision 1.5  1995/03/17  10:44:13  quinn
 184  * Added catch of null-string in makediagrec
 185  *
 186  * Revision 1.4  1995/03/17  10:18:08  quinn
 187  * Added memory management.
 188  *
 189  * Revision 1.3  1995/03/16  17:42:39  quinn
 190  * Little changes
 191  *
 192  * Revision 1.2  1995/03/16  13:29:01  quinn
 193  * Partitioned server.
 194  *
 195  * Revision 1.1  1995/03/15  16:02:10  quinn
 196  * Modded session.c to seshigh.c
 197  *
 198  */
 199
 200 /*
 201  * Frontend server logic.
 202  *
 203  * This code receives incoming APDUs, and handles client requests by means
 204  * of the backend API.
 205  *
 206  * Some of the code is getting quite involved, compared to simpler servers -
 207  * primarily because it is asynchronous both in the communication with
 208  * the user and the backend. We think the complexity will pay off in
 209  * the form of greater flexibility when more asynchronous facilities
 210  * are implemented.
 211  *
 212  * Memory management has become somewhat involved. In the simple case, where
 213  * only one PDU is pending at a time, it will simply reuse the same memory,
 214  * once it has found its working size. When we enable multiple concurrent
 215  * operations, perhaps even with multiple parallel calls to the backend, it
 216  * will maintain a pool of buffers for encoding and decoding, trying to
 217  * minimize memory allocation/deallocation during normal operation.
 218  *
 219  * TODOs include (and will be done in order of public interest):
 220  *
 221  * Support for EXPLAIN - provide simple meta-database system.
 222  * Support for access control.
 223  * Support for resource control.
 224  * Support for extended services - primarily Item Order.
 225  * Rest of Z39.50-1994
 226  *
 227  */
 228
 229 #include <yconfig.h>
 230 #include <stdlib.h>
 231 #include <stdio.h>
 232 #include <unistd.h>
 233 #include <assert.h>
 234
 235 #include <xmalloc.h>
 236 #include <comstack.h>
 237 #include <eventl.h>
 238 #include <session.h>
 239 #include <proto.h>
 240 #include <oid.h>
 241 #include <log.h>
 242 #include <statserv.h>
 243
 244 #include <backend.h>
 245
 246 static int process_request(association *assoc);
 247 void backend_response(IOCHAN i, int event);
 248 static int process_response(association *assoc, request *req, Z_APDU *res);
 249 static Z_APDU *process_initRequest(association *assoc, request *reqb);
 250 static Z_APDU *process_searchRequest(association *assoc, request *reqb,
 251     int *fd);
 252 static Z_APDU *response_searchRequest(association *assoc, request *reqb,
 253     bend_searchresult *bsrt, int *fd);
 254 static Z_APDU *process_presentRequest(association *assoc, request *reqb,
 255     int *fd);
 256 static Z_APDU *process_scanRequest(association *assoc, request *reqb, int *fd);
 257 static void process_close(association *assoc, request *reqb);
 258
 259 static FILE *apduf = 0; /* for use in static mode */
 260 static statserv_options_block *control_block = 0;
 261
 262 /*
 263  * Create and initialize a new association-handle.
 264  *  channel  : iochannel for the current line.
 265  *  link     : communications channel.
 266  * Returns: 0 or a new association handle.
 267  */
 268 association *create_association(IOCHAN channel, COMSTACK link)
 269 {
 270     association *new;
 271
 272     if (!control_block)
 273         control_block = statserv_getcontrol();
 274     if (!(new = xmalloc(sizeof(*new))))
 275         return 0;
 276     new->client_chan = channel;
 277     new->client_link = link;
 278     if (!(new->decode = odr_createmem(ODR_DECODE)) ||
 279         !(new->encode = odr_createmem(ODR_ENCODE)))
 280         return 0;
 281     if (*control_block->apdufile)
 282     {
 283         char filename[256];
 284         FILE *f;
 285
 286         strcpy(filename, control_block->apdufile);
 287         if (!(new->print = odr_createmem(ODR_PRINT)))
 288             return 0;
 289         if (*control_block->apdufile != '-')
 290         {
 291             strcpy(filename, control_block->apdufile);
 292             if (!control_block->dynamic)
 293             {
 294                 if (!apduf)
 295                 {
 296                     if (!(apduf = fopen(filename, "w")))
 297                     {
 298                         logf(LOG_WARN|LOG_ERRNO, "%s", filename);
 299                         return 0;
 300                     }
 301                     setvbuf(apduf, 0, _IONBF, 0);
 302                 }
 303                 f = apduf;
 304             }
 305             else
 306             {
 307                 sprintf(filename + strlen(filename), ".%d", getpid());
 308                 if (!(f = fopen(filename, "w")))
 309                 {
 310                     logf(LOG_WARN|LOG_ERRNO, "%s", filename);
 311                     return 0;
 312                 }
 313                 setvbuf(f, 0, _IONBF, 0);
 314             }
 315             odr_setprint(new->print, f);
 316         }
 317     }
 318     else
 319         new->print = 0;
 320     new->input_buffer = 0;
 321     new->input_buffer_len = 0;
 322     new->backend = 0;
 323     new->state = ASSOC_NEW;
 324     request_initq(&new->incoming);
 325     request_initq(&new->outgoing);
 326     new->proto = cs_getproto(link);
 327     return new;
 328 }
 329
 330 /*
 331  * Free association and release resources.
 332  */
 333 void destroy_association(association *h)
 334 {
 335     odr_destroy(h->decode);
 336     odr_destroy(h->encode);
 337     if (h->print)
 338         odr_destroy(h->print);
 339     if (h->input_buffer)
 340     xfree(h->input_buffer);
 341     if (h->backend)
 342         bend_close(h->backend);
 343     while (request_deq(&h->incoming));
 344     while (request_deq(&h->outgoing));
 345    xfree(h);
 346 }
 347
 348 static void do_close(association *a, int reason, char *message)
 349 {
 350     Z_APDU apdu;
 351     Z_Close *cls = zget_Close(a->encode);
 352     request *req = request_get();
 353
 354     /* Purge request queue */
 355     while (request_deq(&a->incoming));
 356     while (request_deq(&a->outgoing));
 357     if (a->version >= 3)
 358     {
 359         logf(LOG_LOG, "Sending Close PDU, reason=%d, message=%s",
 360             reason, message ? message : "none");
 361         apdu.which = Z_APDU_close;
 362         apdu.u.close = cls;
 363         *cls->closeReason = reason;
 364         cls->diagnosticInformation = message;
 365         process_response(a, req, &apdu);
 366         iochan_settimeout(a->client_chan, 60);
 367     }
 368     else
 369     {
 370         logf(LOG_DEBUG, "v2 client. No Close PDU");
 371         iochan_setevent(a->client_chan, EVENT_TIMEOUT); /* force imm close */
 372     }
 373     a->state = ASSOC_DEAD;
 374 }
 375
 376 /*
 377  * This is where PDUs from the client are read and the further
 378  * processing is initiated. Flow of control moves down through the
 379  * various process_* functions below, until the encoded result comes back up
 380  * to the output handler in here.
 381  *
 382  *  h     : the I/O channel that has an outstanding event.
 383  *  event : the current outstanding event.
 384  */
 385 void ir_session(IOCHAN h, int event)
 386 {
 387     int res;
 388     association *assoc = iochan_getdata(h);
 389     COMSTACK conn = assoc->client_link;
 390     request *req;
 391
 392     assert(h && conn && assoc);
 393     if (event == EVENT_TIMEOUT)
 394     {
 395         if (assoc->state != ASSOC_UP)
 396         {
 397             logf(LOG_LOG, "Final timeout - closing connection.");
 398             cs_close(conn);
 399             destroy_association(assoc);
 400             iochan_destroy(h);
 401         }
 402         else
 403         {
 404             logf(LOG_LOG, "Session idle too long. Sending close.");
 405             do_close(assoc, Z_Close_lackOfActivity, 0);
 406         }
 407         return;
 408     }
 409     if (event & EVENT_INPUT || event & EVENT_WORK) /* input */
 410     {
 411         if (event & EVENT_INPUT)
 412         {
 413             logf(LOG_DEBUG, "ir_session (input)");
 414             assert(assoc && conn);
 415             /* We aren't speaking to this fellow */
 416             if (assoc->state == ASSOC_DEAD)
 417             {
 418                 logf(LOG_LOG, "Closed connection after reject");
 419                 cs_close(conn);
 420                 destroy_association(assoc);
 421                 iochan_destroy(h);
 422                 return;
 423             }
 424             if ((res = cs_get(conn, &assoc->input_buffer,
 425                 &assoc->input_buffer_len)) <= 0)
 426             {
 427                 logf(LOG_LOG, "Connection closed by client");
 428                 cs_close(conn);
 429                 destroy_association(assoc);
 430                 iochan_destroy(h);
 431                 return;
 432             }
 433             else if (res == 1) /* incomplete read - wait for more  */
 434                 return;
 435             if (cs_more(conn)) /* more stuff - call us again later, please */
 436                 iochan_setevent(h, EVENT_INPUT);
 437
 438             /* we got a complete PDU. Let's decode it */
 439             logf(LOG_DEBUG, "Got PDU, %d bytes", res);
 440             req = request_get(); /* get a new request structure */
 441             odr_reset(assoc->decode);
 442             odr_setbuf(assoc->decode, assoc->input_buffer, res, 0);
 443             if (!z_APDU(assoc->decode, &req->request, 0))
 444             {
 445                 logf(LOG_LOG, "ODR error on incoming PDU: %s [near byte %d] ",
 446                     odr_errlist[odr_geterror(assoc->decode)],
 447                     odr_offset(assoc->decode));
 448                 logf(LOG_LOG, "PDU dump:");
 449                 odr_dumpBER(log_file(), assoc->input_buffer, res);
 450                 do_close(assoc, Z_Close_protocolError, "Malformed package");
 451                 return;
 452             }
 453             req->request_mem = odr_extract_mem(assoc->decode);
 454             if (assoc->print && !z_APDU(assoc->print, &req->request, 0))
 455             {
 456                 logf(LOG_WARN, "ODR print error: %s",
 457                     odr_errlist[odr_geterror(assoc->print)]);
 458                 odr_reset(assoc->print);
 459             }
 460             request_enq(&assoc->incoming, req);
 461         }
 462
 463         /* can we do something yet? */
 464         req = request_head(&assoc->incoming);
 465         if (req->state == REQUEST_IDLE)
 466             if (process_request(assoc) < 0)
 467                 do_close(assoc, Z_Close_systemProblem, "Unknown error");
 468     }
 469     if (event & EVENT_OUTPUT)
 470     {
 471         request *req = request_head(&assoc->outgoing);
 472
 473         logf(LOG_DEBUG, "ir_session (output)");
 474         req->state = REQUEST_PENDING;
 475         switch (res = cs_put(conn, req->response, req->len_response))
 476         {
 477             case -1:
 478                 logf(LOG_LOG, "Connection closed by client");
 479                 cs_close(conn);
 480                 destroy_association(assoc);
 481                 iochan_destroy(h);
 482                 break;
 483             case 0: /* all sent - release the request structure */
 484                 logf(LOG_DEBUG, "Wrote PDU, %d bytes", req->len_response);
 485                 nmem_destroy(req->request_mem);
 486                 request_deq(&assoc->outgoing);
 487                 request_release(req);
 488                 if (!request_head(&assoc->outgoing))
 489                     iochan_clearflag(h, EVENT_OUTPUT);
 490                 break;
 491             /* value of 1 -- partial send -- is simply ignored */
 492         }
 493     }
 494     if (event & EVENT_EXCEPT)
 495     {
 496         logf(LOG_DEBUG, "ir_session (exception)");
 497         cs_close(conn);
 498         destroy_association(assoc);
 499         iochan_destroy(h);
 500     }
 501 }
 502
 503 /*
 504  * Initiate request processing.
 505  */
 506 static int process_request(association *assoc)
 507 {
 508     request *req = request_head(&assoc->incoming);
 509     int fd = -1;
 510     Z_APDU *res;
 511
 512     logf(LOG_DEBUG, "process_request");
 513     assert(req && req->state == REQUEST_IDLE);
 514     switch (req->request->which)
 515     {
 516         case Z_APDU_initRequest:
 517             res = process_initRequest(assoc, req); break;
 518         case Z_APDU_searchRequest:
 519             res = process_searchRequest(assoc, req, &fd); break;
 520         case Z_APDU_presentRequest:
 521             res = process_presentRequest(assoc, req, &fd); break;
 522         case Z_APDU_scanRequest:
 523             res = process_scanRequest(assoc, req, &fd); break;
 524         case Z_APDU_close:
 525             process_close(assoc, req); return 0;
 526         default:
 527             logf(LOG_WARN, "Bad APDU received");
 528             return -1;
 529     }
 530     if (res)
 531     {
 532         logf(LOG_DEBUG, "  result immediately available");
 533         return process_response(assoc, req, res);
 534     }
 535     else if (fd < 0)
 536     {
 537         logf(LOG_WARN, "   bad result");
 538         return -1;
 539     }
 540     else /* no result yet - one will be provided later */
 541     {
 542         IOCHAN chan;
 543
 544         /* Set up an I/O handler for the fd supplied by the backend */
 545
 546         logf(LOG_DEBUG, "   establishing handler for result");
 547         req->state = REQUEST_PENDING;
 548         if (!(chan = iochan_create(fd, backend_response, EVENT_INPUT)))
 549             abort();
 550         iochan_setdata(chan, assoc);
 551         return 0;
 552     }
 553 }
 554
 555 /*
 556  * Handle message from the backend.
 557  */
 558 void backend_response(IOCHAN i, int event)
 559 {
 560     association *assoc = iochan_getdata(i);
 561     request *req = request_head(&assoc->incoming);
 562     Z_APDU *res;
 563     int fd;
 564
 565     logf(LOG_DEBUG, "backend_response");
 566     assert(assoc && req && req->state != REQUEST_IDLE);
 567     /* determine what it is we're waiting for */
 568     switch (req->request->which)
 569     {
 570         case Z_APDU_searchRequest:
 571             res = response_searchRequest(assoc, req, 0, &fd); break;
 572 #if 0
 573         case Z_APDU_presentRequest:
 574             res = response_presentRequest(assoc, req, 0, &fd); break;
 575         case Z_APDU_scanRequest:
 576             res = response_scanRequest(assoc, req, 0, &fd); break;
 577 #endif
 578         default:
 579             logf(LOG_WARN, "Serious programmer's lapse or bug");
 580             abort();
 581     }
 582     if ((res && process_response(assoc, req, res) < 0) || fd < 0)
 583     {
 584         logf(LOG_LOG, "Fatal error when talking to backend");
 585         do_close(assoc, Z_Close_systemProblem, 0);
 586         iochan_destroy(i);
 587         return;
 588     }
 589     else if (!res) /* no result yet - try again later */
 590     {
 591         logf(LOG_DEBUG, "   no result yet");
 592         iochan_setfd(i, fd); /* in case fd has changed */
 593     }
 594 }
 595
 596 /*
 597  * Encode response, and transfer the request structure to the outgoing queue.
 598  */
 599 static int process_response(association *assoc, request *req, Z_APDU *res)
 600 {
 601     odr_setbuf(assoc->encode, req->response, req->size_response, 1);
 602     if (!z_APDU(assoc->encode, &res, 0))
 603     {
 604         logf(LOG_WARN, "ODR error when encoding response: %s",
 605             odr_errlist[odr_geterror(assoc->decode)]);
 606         odr_reset(assoc->encode);
 607         return -1;
 608     }
 609     req->response = odr_getbuf(assoc->encode, &req->len_response,
 610         &req->size_response);
 611     odr_setbuf(assoc->encode, 0, 0, 0); /* don'txfree if we abort later */
 612     odr_reset(assoc->encode);
 613     if (assoc->print && !z_APDU(assoc->print, &res, 0))
 614     {
 615         logf(LOG_WARN, "ODR print error: %s",
 616             odr_errlist[odr_geterror(assoc->print)]);
 617         odr_reset(assoc->print);
 618     }
 619     /* change this when we make the backend reentrant */
 620     if (req == request_head(&assoc->incoming))
 621     {
 622         req->state = REQUEST_IDLE;
 623         request_deq(&assoc->incoming);
 624     }
 625     request_enq(&assoc->outgoing, req);
 626     /* turn the work over to the ir_session handler */
 627     iochan_setflag(assoc->client_chan, EVENT_OUTPUT);
 628     /* Is there more work to be done? give that to the input handler too */
 629     if (request_head(&assoc->incoming))
 630         iochan_setevent(assoc->client_chan, EVENT_WORK);
 631     return 0;
 632 }
 633
 634 /*
 635  * Handle init request.
 636  * At the moment, we don't check the options
 637  * anywhere else in the code - we just try not to do anything that would
 638  * break a naive client. We'll toss 'em into the association block when
 639  * we need them there.
 640  */
 641 static Z_APDU *process_initRequest(association *assoc, request *reqb)
 642 {
 643     Z_InitRequest *req = reqb->request->u.initRequest;
 644     Z_APDU *apdu = zget_APDU(assoc->encode, Z_APDU_initResponse);
 645     Z_InitResponse *resp = apdu->u.initResponse;
 646     bend_initrequest binitreq;
 647     bend_initresult *binitres;
 648     char options[100];
 649
 650     logf(LOG_LOG, "Got initRequest");
 651     if (req->implementationId)
 652         logf(LOG_LOG, "Id:        %s", req->implementationId);
 653     if (req->implementationName)
 654         logf(LOG_LOG, "Name:      %s", req->implementationName);
 655     if (req->implementationVersion)
 656         logf(LOG_LOG, "Version:   %s", req->implementationVersion);
 657
 658     binitreq.configname = "default-config";
 659     binitreq.auth = req->idAuthentication;
 660     if (!(binitres = bend_init(&binitreq)))
 661     {
 662         logf(LOG_WARN, "Bad response from backend.");
 663         return 0;
 664     }
 665
 666     assoc->backend = binitres->handle;
 667     resp->referenceId = req->referenceId;
 668     *options = '\0';
 669     /* let's tell the client what we can do */
 670     if (ODR_MASK_GET(req->options, Z_Options_search))
 671     {
 672         ODR_MASK_SET(resp->options, Z_Options_search);
 673         strcat(options, "srch");
 674     }
 675     if (ODR_MASK_GET(req->options, Z_Options_present))
 676     {
 677         ODR_MASK_SET(resp->options, Z_Options_present);
 678         strcat(options, " prst");
 679     }
 680 #if 0
 681     if (ODR_MASK_GET(req->options, Z_Options_delSet))
 682     {
 683         ODR_MASK_SET(&options, Z_Options_delSet);
 684         strcat(options, " del");
 685     }
 686 #endif
 687     if (ODR_MASK_GET(req->options, Z_Options_namedResultSets))
 688     {
 689         ODR_MASK_SET(resp->options, Z_Options_namedResultSets);
 690         strcat(options, " namedresults");
 691     }
 692     if (ODR_MASK_GET(req->options, Z_Options_scan))
 693     {
 694         ODR_MASK_SET(resp->options, Z_Options_scan);
 695         strcat(options, " scan");
 696     }
 697     if (ODR_MASK_GET(req->options, Z_Options_concurrentOperations))
 698     {
 699         ODR_MASK_SET(resp->options, Z_Options_concurrentOperations);
 700         strcat(options, " concurop");
 701     }
 702
 703     if (ODR_MASK_GET(req->protocolVersion, Z_ProtocolVersion_1))
 704     {
 705         ODR_MASK_SET(resp->protocolVersion, Z_ProtocolVersion_1);
 706         assoc->version = 2; /* 1 & 2 are equivalent */
 707     }
 708     if (ODR_MASK_GET(req->protocolVersion, Z_ProtocolVersion_2))
 709     {
 710         ODR_MASK_SET(resp->protocolVersion, Z_ProtocolVersion_2);
 711         assoc->version = 2;
 712     }
 713     if (ODR_MASK_GET(req->protocolVersion, Z_ProtocolVersion_3))
 714     {
 715         ODR_MASK_SET(resp->protocolVersion, Z_ProtocolVersion_3);
 716         assoc->version = 3;
 717     }
 718     logf(LOG_LOG, "Negotiated to v%d: %s", assoc->version, options);
 719     assoc->maximumRecordSize = *req->maximumRecordSize;
 720     if (assoc->maximumRecordSize > control_block->maxrecordsize)
 721         assoc->maximumRecordSize = control_block->maxrecordsize;
 722     assoc->preferredMessageSize = *req->preferredMessageSize;
 723     if (assoc->preferredMessageSize > assoc->maximumRecordSize)
 724         assoc->preferredMessageSize = assoc->maximumRecordSize;
 725     resp->preferredMessageSize = &assoc->preferredMessageSize;
 726     resp->maximumRecordSize = &assoc->maximumRecordSize;
 727     resp->implementationName = "Index Data/YAZ Generic Frontend Server";
 728     if (binitres->errcode)
 729     {
 730         logf(LOG_LOG, "Connection rejected by backend.");
 731         *resp->result = 0;
 732         assoc->state = ASSOC_DEAD;
 733     }
 734     else
 735         assoc->state = ASSOC_UP;
 736     return apdu;
 737 }
 738
 739 /*
 740  * These functions should be merged.
 741  */
 742
 743 /*
 744  * nonsurrogate diagnostic record.
 745  */
 746 static Z_Records *diagrec(oid_proto proto, int error, char *addinfo)
 747 {
 748     static Z_Records rec;
 749     oident bib1;
 750     static int err;
 751 #ifdef Z_95
 752     static Z_DiagRec drec;
 753     static Z_DefaultDiagFormat dr;
 754 #else
 755     static Z_DiagRec dr;
 756 #endif
 757
 758     bib1.proto = proto;
 759     bib1.oclass = CLASS_DIAGSET;
 760     bib1.value = VAL_BIB1;
 761
 762     logf(LOG_DEBUG, "Diagnostic: %d -- %s", error, addinfo ? addinfo :
 763         "NULL");
 764     err = error;
 765     rec.which = Z_Records_NSD;
 766 #ifdef Z_95
 767     rec.u.nonSurrogateDiagnostic = &drec;
 768     drec.which = Z_DiagRec_defaultFormat;
 769     drec.u.defaultFormat = &dr;
 770 #else
 771     rec.u.nonSurrogateDiagnostic = &dr;
 772 #endif
 773     dr.diagnosticSetId = oid_getoidbyent(&bib1);
 774     dr.condition = &err;
 775     dr.which = Z_DiagForm_v2AddInfo;
 776     dr.addinfo = addinfo ? addinfo : "";
 777     return &rec;
 778 }
 779
 780 /*
 781  * surrogate diagnostic.
 782  */
 783 static Z_NamePlusRecord *surrogatediagrec(oid_proto proto, char *dbname,
 784                                             int error, char *addinfo)
 785 {
 786     static Z_NamePlusRecord rec;
 787     static int err;
 788     oident bib1;
 789 #ifdef Z_95
 790     static Z_DiagRec drec;
 791     static Z_DefaultDiagFormat dr;
 792 #else
 793     static Z_DiagRec dr;
 794 #endif
 795
 796     bib1.proto = proto;
 797     bib1.oclass = CLASS_DIAGSET;
 798     bib1.value = VAL_BIB1;
 799
 800     logf(LOG_DEBUG, "SurrogateDiagnotic: %d -- %s", error, addinfo);
 801     err = error;
 802     rec.databaseName = dbname;
 803     rec.which = Z_NamePlusRecord_surrogateDiagnostic;
 804 #ifdef Z_95
 805     rec.u.surrogateDiagnostic = &drec;
 806     drec.which = Z_DiagRec_defaultFormat;
 807     drec.u.defaultFormat = &dr;
 808 #else
 809     rec.u.surrogateDiagnostic = &dr;
 810 #endif
 811     dr.diagnosticSetId = oid_getoidbyent(&bib1);
 812     dr.condition = &err;
 813     dr.which = Z_DiagForm_v2AddInfo;
 814     dr.addinfo = addinfo ? addinfo : "";
 815     return &rec;
 816 }
 817
 818 /*
 819  * multiple nonsurrogate diagnostics.
 820  */
 821 static Z_DiagRecs *diagrecs(oid_proto proto, int error, char *addinfo)
 822 {
 823     static Z_DiagRecs recs;
 824     static int err;
 825     oident bib1;
 826 #ifdef Z_95
 827     static Z_DiagRec *recp[1], drec;
 828     static Z_DefaultDiagFormat rec;
 829 #else
 830     static Z_DiagRec *recp[1], rec;
 831 #endif
 832
 833     logf(LOG_DEBUG, "DiagRecs: %d -- %s", error, addinfo);
 834     bib1.proto = proto;
 835     bib1.oclass = CLASS_DIAGSET;
 836     bib1.value = VAL_BIB1;
 837
 838     err = error;
 839     recs.num_diagRecs = 1;
 840     recs.diagRecs = recp;
 841 #ifdef Z_95
 842     recp[0] = &drec;
 843     drec.which = Z_DiagRec_defaultFormat;
 844     drec.u.defaultFormat = &rec;
 845 #else
 846     recp[0] = &rec;
 847 #endif
 848     rec.diagnosticSetId = oid_getoidbyent(&bib1);
 849     rec.condition = &err;
 850     rec.which = Z_DiagForm_v2AddInfo;
 851     rec.addinfo = addinfo ? addinfo : "";
 852     return &recs;
 853 }
 854
 855 #define MAX_RECORDS 256
 856
 857 static Z_Records *pack_records(association *a, char *setname, int start,
 858                                 int *num, Z_RecordComposition *comp,
 859                                 int *next, int *pres, oid_value format)
 860 {
 861     int recno, total_length = 0, toget = *num, dumped_records = 0;
 862     static Z_Records records;
 863     static Z_NamePlusRecordList reclist;
 864     static Z_NamePlusRecord *list[MAX_RECORDS];
 865     oident recform;
 866
 867     records.which = Z_Records_DBOSD;
 868     records.u.databaseOrSurDiagnostics = &reclist;
 869     reclist.num_records = 0;
 870     reclist.records = list;
 871     *pres = Z_PRES_SUCCESS;
 872     *num = 0;
 873     *next = 0;
 874
 875     logf(LOG_DEBUG, "Request to pack %d+%d", start, toget);
 876     logf(LOG_DEBUG, "pms=%d, mrs=%d", a->preferredMessageSize,
 877         a->maximumRecordSize);
 878     for (recno = start; reclist.num_records < toget; recno++)
 879     {
 880         bend_fetchrequest freq;
 881         bend_fetchresult *fres;
 882         Z_NamePlusRecord *thisrec;
 883         Z_DatabaseRecord *thisext;
 884         int this_length;
 885
 886         /*
 887          * we get the number of bytes allocated on the stream before any
 888          * allocation done by the backend - this should give us a reasonable
 889          * idea of the total size of the data so far.
 890          */
 891         total_length = odr_total(a->encode) - dumped_records;
 892         if (reclist.num_records == MAX_RECORDS - 1)
 893         {
 894             *pres = Z_PRES_PARTIAL_2;
 895             break;
 896         }
 897         freq.setname = setname;
 898         freq.number = recno;
 899         freq.comp = comp;
 900         freq.format = format;
 901         freq.stream = a->encode;
 902         if (!(fres = bend_fetch(a->backend, &freq, 0)))
 903         {
 904             *pres = Z_PRES_FAILURE;
 905             return diagrec(a->proto, 2, "Backend interface problem");
 906         }
 907         /* backend should be able to signal whether error is system-wide
 908            or only pertaining to current record */
 909         if (fres->errcode)
 910         {
 911             *pres = Z_PRES_FAILURE;
 912             return diagrec(a->proto, fres->errcode, fres->errstring);
 913         }
 914         if (fres->len >= 0)
 915             this_length = fres->len;
 916         else
 917             this_length = odr_total(a->encode) - total_length;
 918         logf(LOG_DEBUG, "  fetched record, len=%d, total=%d",
 919             this_length, total_length);
 920         if (this_length + total_length > a->preferredMessageSize)
 921         {
 922             /* record is small enough, really */
 923             if (this_length <= a->preferredMessageSize)
 924             {
 925                 logf(LOG_DEBUG, "  Dropped last normal-sized record");
 926                 *pres = Z_PRES_PARTIAL_2;
 927                 break;
 928             }
 929             /* record can only be fetched by itself */
 930             if (this_length < a->maximumRecordSize)
 931             {
 932                 logf(LOG_DEBUG, "  Record > prefmsgsz");
 933                 if (toget > 1)
 934                 {
 935                     logf(LOG_DEBUG, "  Dropped it");
 936                     reclist.records[reclist.num_records] =
 937                          surrogatediagrec(a->proto, fres->basename, 16, 0);
 938                     reclist.num_records++;
 939                     *next = fres->last_in_set ? 0 : recno + 1;
 940                     dumped_records += this_length;
 941                     continue;
 942                 }
 943             }
 944             else /* too big entirely */
 945             {
 946                 logf(LOG_DEBUG, "Record > maxrcdsz");
 947                 reclist.records[reclist.num_records] =
 948                     surrogatediagrec(a->proto, fres->basename, 17, 0);
 949                 reclist.num_records++;
 950                 *next = fres->last_in_set ? 0 : recno + 1;
 951                 dumped_records += this_length;
 952                 continue;
 953             }
 954         }
 955         if (!(thisrec = odr_malloc(a->encode, sizeof(*thisrec))))
 956             return 0;
 957         if (!(thisrec->databaseName = odr_malloc(a->encode,
 958             strlen(fres->basename) + 1)))
 959             return 0;
 960         strcpy(thisrec->databaseName, fres->basename);
 961         thisrec->which = Z_NamePlusRecord_databaseRecord;
 962         if (!(thisrec->u.databaseRecord = thisext = odr_malloc(a->encode,
 963             sizeof(Z_DatabaseRecord))))
 964             return 0;
 965         recform.proto = a->proto;
 966         recform.oclass = CLASS_RECSYN;
 967         recform.value = fres->format;
 968         thisext->direct_reference = odr_oiddup(a->encode,
 969             oid_getoidbyent(&recform));
 970         thisext->indirect_reference = 0;
 971         thisext->descriptor = 0;
 972         if (fres->len < 0) /* Structured data */
 973         {
 974             switch (fres->format)
 975             {
 976                 case VAL_SUTRS: thisext->which = Z_External_sutrs; break;
 977                 case VAL_GRS1: thisext->which = Z_External_grs1; break;
 978                 case VAL_EXPLAIN: thisext->which = Z_External_explainRecord;
 979                     break;
 980                 case VAL_SUMMARY: thisext->which = Z_External_summary; break;
 981                 case VAL_OPAC: thisext->which = Z_External_OPAC; break;
 982
 983                 default:
 984                     logf(LOG_FATAL, "Unknown structured format from backend.");
 985                     return 0;
 986             }
 987
 988             /*
 989              * We cheat on the pointers here. Obviously, the record field
 990              * of the backend-fetch structure should have been a union for
 991              * correctness, but we're stuck with this for backwards
 992              * compatibility.
 993              */
 994             thisext->u.grs1 = (Z_GenericRecord*) fres->record;
 995         }
 996         else if (fres->format == VAL_SUTRS) /* SUTRS is a single-ASN.1-type */
 997         {
 998             Odr_oct *sutrs = odr_malloc(a->encode, sizeof(*sutrs));
 999
1000             thisext->which = Z_External_sutrs;
1001             thisext->u.sutrs = sutrs;
1002             sutrs->buf = odr_malloc(a->encode, fres->len);
1003             sutrs->len = sutrs->size = fres->len;
1004             memcpy(sutrs->buf, fres->record, fres->len);
1005         }
1006         else /* octet-aligned record. */
1007         {
1008             thisext->which = Z_External_octet;
1009             if (!(thisext->u.octet_aligned = odr_malloc(a->encode,
1010                 sizeof(Odr_oct))))
1011                 return 0;
1012             if (!(thisext->u.octet_aligned->buf = odr_malloc(a->encode,
1013                 fres->len)))
1014                 return 0;
1015             memcpy(thisext->u.octet_aligned->buf, fres->record, fres->len);
1016             thisext->u.octet_aligned->len = thisext->u.octet_aligned->size =
1017                 fres->len;
1018         }
1019         reclist.records[reclist.num_records] = thisrec;
1020         reclist.num_records++;
1021         *next = fres->last_in_set ? 0 : recno + 1;
1022     }
1023     *num = reclist.num_records;
1024     return &records;
1025 }
1026
1027 static Z_APDU *process_searchRequest(association *assoc, request *reqb,
1028     int *fd)
1029 {
1030     Z_SearchRequest *req = reqb->request->u.searchRequest;
1031     bend_searchrequest bsrq;
1032     bend_searchresult *bsrt;
1033
1034     logf(LOG_LOG, "Got SearchRequest.");
1035
1036     bsrq.setname = req->resultSetName;
1037     bsrq.replace_set = *req->replaceIndicator;
1038     bsrq.num_bases = req->num_databaseNames;
1039     bsrq.basenames = req->databaseNames;
1040     bsrq.query = req->query;
1041
1042     if (!(bsrt = bend_search(assoc->backend, &bsrq, fd)))
1043         return 0;
1044     return response_searchRequest(assoc, reqb, bsrt, fd);
1045 }
1046
1047 bend_searchresult *bend_searchresponse(void *handle) {return 0;}
1048
1049 /*
1050  * Prepare a searchresponse based on the backend results. We probably want
1051  * to look at making the fetching of records nonblocking as well, but
1052  * so far, we'll keep things simple.
1053  * If bsrt is null, that means we're called in response to a communications
1054  * event, and we'll have to get the response for ourselves.
1055  */
1056 static Z_APDU *response_searchRequest(association *assoc, request *reqb,
1057     bend_searchresult *bsrt, int *fd)
1058 {
1059     Z_SearchRequest *req = reqb->request->u.searchRequest;
1060     static Z_APDU apdu;
1061     static Z_SearchResponse resp;
1062     static int nulint = 0;
1063     static bool_t sr = 1;
1064     static int next = 0;
1065     static int none = Z_RES_NONE;
1066
1067     apdu.which = Z_APDU_searchResponse;
1068     apdu.u.searchResponse = &resp;
1069     resp.referenceId = req->referenceId;
1070 #ifdef Z_95
1071     resp.additionalSearchInfo = 0;
1072     resp.otherInfo = 0;
1073 #endif
1074     *fd = -1;
1075     if (!bsrt && !(bsrt = bend_searchresponse(assoc->backend)))
1076     {
1077         logf(LOG_FATAL, "Bad result from backend");
1078         return 0;
1079     }
1080     else if (bsrt->errcode)
1081     {
1082         resp.records = diagrec(assoc->proto, bsrt->errcode,
1083             bsrt->errstring);
1084         resp.resultCount = &nulint;
1085         resp.numberOfRecordsReturned = &nulint;
1086         resp.nextResultSetPosition = &nulint;
1087         resp.searchStatus = &nulint;
1088         resp.resultSetStatus = &none;
1089         resp.presentStatus = 0;
1090     }
1091     else
1092     {
1093         static int toget;
1094         Z_RecordComposition comp, *compp = 0;
1095         static int presst = 0;
1096
1097         resp.records = 0;
1098         resp.resultCount = &bsrt->hits;
1099
1100         comp.which = Z_RecordComp_simple;
1101         /* how many records does the user agent want, then? */
1102         if (bsrt->hits <= *req->smallSetUpperBound)
1103         {
1104             toget = bsrt->hits;
1105             if ((comp.u.simple = req->smallSetElementSetNames))
1106                 compp = &comp;
1107         }
1108         else if (bsrt->hits < *req->largeSetLowerBound)
1109         {
1110             toget = *req->mediumSetPresentNumber;
1111             if (toget > bsrt->hits)
1112                 toget = bsrt->hits;
1113             if ((comp.u.simple = req->mediumSetElementSetNames))
1114                 compp = &comp;
1115         }
1116         else
1117             toget = 0;
1118
1119         if (toget && !resp.records)
1120         {
1121             oident *prefformat;
1122             oid_value form;
1123
1124             if (!(prefformat = oid_getentbyoid(req->preferredRecordSyntax)) ||
1125                 prefformat->oclass != CLASS_RECSYN)
1126                 form = VAL_NONE;
1127             else
1128                 form = prefformat->value;
1129             resp.records = pack_records(assoc, req->resultSetName, 1,
1130                 &toget, compp, &next, &presst, form);
1131             if (!resp.records)
1132                 return 0;
1133             resp.numberOfRecordsReturned = &toget;
1134             resp.nextResultSetPosition = &next;
1135             resp.searchStatus = &sr;
1136             resp.resultSetStatus = 0;
1137             resp.presentStatus = &presst;
1138         }
1139         else
1140         {
1141             if (*resp.resultCount)
1142                 next = 1;
1143             resp.numberOfRecordsReturned = &nulint;
1144             resp.nextResultSetPosition = &next;
1145             resp.searchStatus = &sr;
1146             resp.resultSetStatus = 0;
1147             resp.presentStatus = 0;
1148         }
1149     }
1150     return &apdu;
1151 }
1152
1153 /*
1154  * Maybe we got a little over-friendly when we designed bend_fetch to
1155  * get only one record at a time. Some backends can optimise multiple-record
1156  * fetches, and at any rate, there is some overhead involved in
1157  * all that selecting and hopping around. Problem is, of course, that the
1158  * frontend can't know ahead of time how many records it'll need to
1159  * fill the negotiated PDU size. Annoying. Segmentation or not, Z/SR
1160  * is downright lousy as a bulk data transfer protocol.
1161  *
1162  * To start with, we'll do the fetching of records from the backend
1163  * in one operation: To save some trips in and out of the event-handler,
1164  * and to simplify the interface to pack_records. At any rate, asynch
1165  * operation is more fun in operations that have an unpredictable execution
1166  * speed - which is normally more true for search than for present.
1167  */
1168 static Z_APDU *process_presentRequest(association *assoc, request *reqb,
1169     int *fd)
1170 {
1171     Z_PresentRequest *req = reqb->request->u.presentRequest;
1172     static Z_APDU apdu;
1173     static Z_PresentResponse resp;
1174     static int presst, next, num;
1175     oident *prefformat;
1176     oid_value form;
1177
1178
1179     logf(LOG_LOG, "Got PresentRequest.");
1180     apdu.which = Z_APDU_presentResponse;
1181     apdu.u.presentResponse = &resp;
1182     resp.referenceId = req->referenceId;
1183 #ifdef Z_95
1184     resp.otherInfo = 0;
1185 #endif
1186
1187     if (!(prefformat = oid_getentbyoid(req->preferredRecordSyntax)) ||
1188         prefformat->oclass != CLASS_RECSYN)
1189         form = VAL_NONE;
1190     else
1191         form = prefformat->value;
1192     num = *req->numberOfRecordsRequested;
1193     resp.records = pack_records(assoc, req->resultSetId,
1194         *req->resultSetStartPoint, &num, req->recordComposition, &next,
1195         &presst, form);
1196     if (!resp.records)
1197         return 0;
1198     resp.numberOfRecordsReturned = &num;
1199     resp.presentStatus = &presst;
1200     resp.nextResultSetPosition = &next;
1201
1202     return &apdu;
1203 }
1204
1205 /*
1206  * Scan was implemented rather in a hurry, and with support for only the basic
1207  * elements of the service in the backend API. Suggestions are welcome.
1208  */
1209 static Z_APDU *process_scanRequest(association *assoc, request *reqb, int *fd)
1210 {
1211     Z_ScanRequest *req = reqb->request->u.scanRequest;
1212     static Z_APDU apdu;
1213     static Z_ScanResponse res;
1214     static int scanStatus = Z_Scan_failure;
1215     static int numberOfEntriesReturned = 0;
1216     oident *attent;
1217     static Z_ListEntries ents;
1218 #define SCAN_MAX_ENTRIES 200
1219     static Z_Entry *tab[SCAN_MAX_ENTRIES];
1220     bend_scanrequest srq;
1221     bend_scanresult *srs;
1222     oident *attset;
1223
1224     logf(LOG_LOG, "Got scanrequest");
1225     apdu.which = Z_APDU_scanResponse;
1226     apdu.u.scanResponse = &res;
1227     res.referenceId = req->referenceId;
1228     res.stepSize = 0;
1229     res.scanStatus = &scanStatus;
1230     res.numberOfEntriesReturned = &numberOfEntriesReturned;
1231     res.positionOfTerm = 0;
1232     res.entries = &ents;
1233     ents.which = Z_ListEntries_nonSurrogateDiagnostics;
1234     res.attributeSet = 0;
1235 #ifdef Z_95
1236     res.otherInfo = 0;
1237 #endif
1238
1239     if (req->attributeSet && (!(attent = oid_getentbyoid(req->attributeSet)) ||
1240         attent->oclass != CLASS_ATTSET || attent->value != VAL_BIB1))
1241         ents.u.nonSurrogateDiagnostics = diagrecs(assoc->proto, 121, 0);
1242     else if (req->stepSize && *req->stepSize > 0)
1243         ents.u.nonSurrogateDiagnostics = diagrecs(assoc->proto, 205, 0);
1244     else
1245     {
1246         if (req->termListAndStartPoint->term->which == Z_Term_general)
1247             logf(LOG_DEBUG, " term: '%.*s'",
1248                 req->termListAndStartPoint->term->u.general->len,
1249                 req->termListAndStartPoint->term->u.general->buf);
1250         srq.num_bases = req->num_databaseNames;
1251         srq.basenames = req->databaseNames;
1252         srq.num_entries = *req->numberOfTermsRequested;
1253         srq.term = req->termListAndStartPoint;
1254         if (!(attset = oid_getentbyoid(req->attributeSet)) ||
1255             attset->oclass != CLASS_RECSYN)
1256             srq.attributeset = VAL_NONE;
1257         else
1258             srq.attributeset = attset->value;
1259         srq.term_position = req->preferredPositionInResponse ?
1260             *req->preferredPositionInResponse : 1;
1261         if (!(srs = bend_scan(assoc->backend, &srq, 0)))
1262             ents.u.nonSurrogateDiagnostics = diagrecs(assoc->proto, 2, 0);
1263         else if (srs->errcode)
1264             ents.u.nonSurrogateDiagnostics = diagrecs(assoc->proto,
1265                 srs->errcode, srs->errstring);
1266         else
1267         {
1268             int i;
1269             static Z_Entries list;
1270
1271             if (srs->status == BEND_SCAN_PARTIAL)
1272                 scanStatus = Z_Scan_partial_5;
1273             else
1274                 scanStatus = Z_Scan_success;
1275             ents.which = Z_ListEntries_entries;
1276             ents.u.entries = &list;
1277             list.entries = tab;
1278             for (i = 0; i < srs->num_entries; i++)
1279             {
1280                 Z_Entry *e;
1281                 Z_TermInfo *t;
1282                 Odr_oct *o;
1283
1284                 if (i >= SCAN_MAX_ENTRIES)
1285                 {
1286                     scanStatus = Z_Scan_partial_4;
1287                     break;
1288                 }
1289                 list.entries[i] = e = odr_malloc(assoc->encode, sizeof(*e));
1290                 e->which = Z_Entry_termInfo;
1291                 e->u.termInfo = t = odr_malloc(assoc->encode, sizeof(*t));
1292                 t->suggestedAttributes = 0;
1293                 t->displayTerm = 0;
1294                 t->alternativeTerm = 0;
1295                 t->byAttributes = 0;
1296                 t->otherTermInfo = 0;
1297                 t->globalOccurrences = &srs->entries[i].occurrences;
1298                 t->term = odr_malloc(assoc->encode, sizeof(*t->term));
1299                 t->term->which = Z_Term_general;
1300                 t->term->u.general = o = odr_malloc(assoc->encode,
1301                     sizeof(Odr_oct));
1302                 o->buf = odr_malloc(assoc->encode, o->len = o->size =
1303                     strlen(srs->entries[i].term));
1304                 memcpy(o->buf, srs->entries[i].term, o->len);
1305                 logf(LOG_DEBUG, "  term #%d: '%s' (%d)", i,
1306                     srs->entries[i].term, srs->entries[i].occurrences);
1307             }
1308             list.num_entries = i;
1309             res.numberOfEntriesReturned = &list.num_entries;
1310             res.positionOfTerm = &srs->term_position;
1311         }
1312     }
1313
1314     return &apdu;
1315 }
1316
1317 static void process_close(association *assoc, request *reqb)
1318 {
1319     Z_Close *req = reqb->request->u.close;
1320     static char *reasons[] =
1321     {
1322         "finished",
1323         "shutdown",
1324         "systemProblem",
1325         "costLimit",
1326         "resources",
1327         "securityViolation",
1328         "protocolError",
1329         "lackOfActivity",
1330         "peerAbort",
1331         "unspecified"
1332     };
1333
1334     logf(LOG_LOG, "Got close, reason %s, message %s",
1335         reasons[*req->closeReason], req->diagnosticInformation ?
1336         req->diagnosticInformation : "NULL");
1337     if (assoc->version < 3) /* to make do_force respond with close */
1338         assoc->version = 3;
1339     do_close(assoc, Z_Close_finished, "Association terminated by client");
1340 }