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 1.67  1997-09-17 12:10:40  adam
   8  * YAZ version 1.4.
   9  *
  10  * Revision 1.66  1997/09/05 15:26:44  adam
  11  * Added ODR encode in search and scen bend request structures.
  12  * Fixed a few enums that caused trouble with C++.
  13  *
  14  * Revision 1.65  1997/09/01 08:53:01  adam
  15  * New windows NT/95 port using MSV5.0. The test server 'ztest' was
  16  * moved a separate directory. MSV5.0 project server.dsp created.
  17  * As an option, the server can now operate as an NT service.
  18  *
  19  * Revision 1.64  1997/04/30 08:52:11  quinn
  20  * Null
  21  *
  22  * Revision 1.63  1996/10/11  11:57:26  quinn
  23  * Smallish
  24  *
  25  * Revision 1.62  1996/07/06  19:58:35  quinn
  26  * System headerfiles gathered in yconfig
  27  *
  28  * Revision 1.61  1996/06/10  08:56:16  quinn
  29  * Work on Summary.
  30  *
  31  * Revision 1.60  1996/05/30  11:03:10  quinn
  32  * Fixed NextresultSetPosition bug fixed.
  33  *
  34  * Revision 1.59  1996/05/14  09:26:46  quinn
  35  * Added attribute set to scan backend
  36  *
  37  * Revision 1.58  1996/02/20  12:53:04  quinn
  38  * Chanes to SCAN
  39  *
  40  * Revision 1.57  1996/01/02  08:57:47  quinn
  41  * Changed enums in the ASN.1 .h files to #defines. Changed oident.class to oclass
  42  *
  43  * Revision 1.56  1995/12/14  11:09:57  quinn
  44  * Work on Explain
  45  *
  46  * Revision 1.55  1995/11/08  17:41:37  quinn
  47  * Smallish.
  48  *
  49  * Revision 1.54  1995/11/08  15:11:29  quinn
  50  * Log of close transmit.
  51  *
  52  * Revision 1.53  1995/11/01  13:54:58  quinn
  53  * Minor adjustments
  54  *
  55  * Revision 1.52  1995/11/01  12:19:13  quinn
  56  * Second attempt to fix same bug.
  57  *
  58  * Revision 1.50  1995/10/25  16:58:32  quinn
  59  * Simple.
  60  *
  61  * Revision 1.49  1995/10/16  13:51:53  quinn
  62  * Changes to provide Especs to the backend.
  63  *
  64  * Revision 1.48  1995/10/06  08:51:20  quinn
  65  * Added Write-buffer.
  66  *
  67  * Revision 1.47  1995/08/29  14:24:16  quinn
  68  * Added second half of close-handshake
  69  *
  70  * Revision 1.46  1995/08/29  11:17:58  quinn
  71  * Added code to receive close
  72  *
  73  * Revision 1.45  1995/08/21  09:11:00  quinn
  74  * Smallish fixes to suppport new formats.
  75  *
  76  * Revision 1.44  1995/08/17  12:45:25  quinn
  77  * Fixed minor problems with GRS-1. Added support in c&s.
  78  *
  79  * Revision 1.43  1995/08/15  12:00:31  quinn
  80  * Updated External
  81  *
  82  * Revision 1.42  1995/08/15  11:16:50  quinn
  83  *
  84  * Revision 1.41  1995/08/02  10:23:06  quinn
  85  * Smallish
  86  *
  87  * Revision 1.40  1995/07/31  14:34:26  quinn
  88  * Fixed bug in process_searchResponse (numberOfRecordsReturned).
  89  *
  90  * Revision 1.39  1995/06/27  13:21:00  quinn
  91  * SUTRS support
  92  *
  93  * Revision 1.38  1995/06/19  12:39:11  quinn
  94  * Fixed bug in timeout code. Added BER dumper.
  95  *
  96  * Revision 1.37  1995/06/16  13:16:14  quinn
  97  * Fixed Defaultdiagformat.
  98  *
  99  * Revision 1.36  1995/06/16  10:31:36  quinn
 100  * Added session timeout.
 101  *
 102  * Revision 1.35  1995/06/15  07:45:14  quinn
 103  * Moving to v3.
 104  *
 105  * Revision 1.34  1995/06/14  15:26:46  quinn
 106  * *** empty log message ***
 107  *
 108  * Revision 1.33  1995/06/06  14:57:05  quinn
 109  * Better diagnostics.
 110  *
 111  * Revision 1.32  1995/06/06  08:41:44  quinn
 112  * Better diagnostics.
 113  *
 114  * Revision 1.31  1995/06/06  08:15:37  quinn
 115  * Cosmetic.
 116  *
 117  * Revision 1.30  1995/06/05  10:53:32  quinn
 118  * Added a better SCAN.
 119  *
 120  * Revision 1.29  1995/06/01  11:25:03  quinn
 121  * Smallish.
 122  *
 123  * Revision 1.28  1995/06/01  11:21:01  quinn
 124  * Attempting to fix a bug in pack-records. replaced break with continue
 125  * for large records, according to standard.
 126  *
 127  * Revision 1.27  1995/05/29  08:12:06  quinn
 128  * Moved oid to util
 129  *
 130  * Revision 1.26  1995/05/18  13:02:12  quinn
 131  * Smallish.
 132  *
 133  * Revision 1.25  1995/05/17  08:42:26  quinn
 134  * Transfer auth info to backend. Allow backend to reject init gracefully.
 135  *
 136  * Revision 1.24  1995/05/16  08:51:04  quinn
 137  * License, documentation, and memory fixes
 138  *
 139  * Revision 1.23  1995/05/15  13:25:10  quinn
 140  * Fixed memory bug.
 141  *
 142  * Revision 1.22  1995/05/15  11:56:39  quinn
 143  * Asynchronous facilities. Restructuring of seshigh code.
 144  *
 145  * Revision 1.21  1995/05/02  08:53:19  quinn
 146  * Trying in vain to fix comm with ISODE
 147  *
 148  * Revision 1.20  1995/04/20  15:13:00  quinn
 149  * Cosmetic
 150  *
 151  * Revision 1.19  1995/04/18  08:15:34  quinn
 152  * Added dynamic memory allocation on encoding (whew). Code is now somewhat
 153  * neater. We'll make the same change for decoding one day.
 154  *
 155  * Revision 1.18  1995/04/17  11:28:25  quinn
 156  * Smallish
 157  *
 158  * Revision 1.17  1995/04/10  10:23:36  quinn
 159  * Some work to add scan and other things.
 160  *
 161  * Revision 1.16  1995/03/31  09:18:55  quinn
 162  * Added logging.
 163  *
 164  * Revision 1.15  1995/03/30  14:03:23  quinn
 165  * Added RFC1006 as separate library
 166  *
 167  * Revision 1.14  1995/03/30  12:18:17  quinn
 168  * Fixed bug.
 169  *
 170  * Revision 1.13  1995/03/30  09:09:24  quinn
 171  * Added state-handle and some support for asynchronous activities.
 172  *
 173  * Revision 1.12  1995/03/29  15:40:16  quinn
 174  * Ongoing work. Statserv is now dynamic by default
 175  *
 176  * Revision 1.11  1995/03/28  09:16:21  quinn
 177  * Added record packing to the search request
 178  *
 179  * Revision 1.10  1995/03/27  08:34:24  quinn
 180  * Added dynamic server functionality.
 181  * Released bindings to session.c (is now redundant)
 182  *
 183  * Revision 1.9  1995/03/22  15:01:26  quinn
 184  * Adjusting record packing.
 185  *
 186  * Revision 1.8  1995/03/22  10:13:21  quinn
 187  * Working on record packer
 188  *
 189  * Revision 1.7  1995/03/21  15:53:31  quinn
 190  * Little changes.
 191  *
 192  * Revision 1.6  1995/03/21  12:30:09  quinn
 193  * Beginning to add support for record packing.
 194  *
 195  * Revision 1.5  1995/03/17  10:44:13  quinn
 196  * Added catch of null-string in makediagrec
 197  *
 198  * Revision 1.4  1995/03/17  10:18:08  quinn
 199  * Added memory management.
 200  *
 201  * Revision 1.3  1995/03/16  17:42:39  quinn
 202  * Little changes
 203  *
 204  * Revision 1.2  1995/03/16  13:29:01  quinn
 205  * Partitioned server.
 206  *
 207  * Revision 1.1  1995/03/15  16:02:10  quinn
 208  * Modded session.c to seshigh.c
 209  *
 210  */
 211
 212 /*
 213  * Frontend server logic.
 214  *
 215  * This code receives incoming APDUs, and handles client requests by means
 216  * of the backend API.
 217  *
 218  * Some of the code is getting quite involved, compared to simpler servers -
 219  * primarily because it is asynchronous both in the communication with
 220  * the user and the backend. We think the complexity will pay off in
 221  * the form of greater flexibility when more asynchronous facilities
 222  * are implemented.
 223  *
 224  * Memory management has become somewhat involved. In the simple case, where
 225  * only one PDU is pending at a time, it will simply reuse the same memory,
 226  * once it has found its working size. When we enable multiple concurrent
 227  * operations, perhaps even with multiple parallel calls to the backend, it
 228  * will maintain a pool of buffers for encoding and decoding, trying to
 229  * minimize memory allocation/deallocation during normal operation.
 230  *
 231  * TODOs include (and will be done in order of public interest):
 232  *
 233  * Support for EXPLAIN - provide simple meta-database system.
 234  * Support for access control.
 235  * Support for resource control.
 236  * Support for extended services - primarily Item Order.
 237  * Rest of Z39.50-1994
 238  *
 239  */
 240
 241 #include <yconfig.h>
 242 #include <stdlib.h>
 243 #include <stdio.h>
 244 #ifdef WINDOWS
 245 #include <process.h>
 246 #else
 247 #include <unistd.h>
 248 #endif
 249 #include <assert.h>
 250
 251 #include <xmalloc.h>
 252 #include <comstack.h>
 253 #include "eventl.h"
 254 #include "session.h"
 255 #include <proto.h>
 256 #include <oid.h>
 257 #include <log.h>
 258 #include <statserv.h>
 259
 260 #include <backend.h>
 261
 262 static int process_request(association *assoc);
 263 void backend_response(IOCHAN i, int event);
 264 static int process_response(association *assoc, request *req, Z_APDU *res);
 265 static Z_APDU *process_initRequest(association *assoc, request *reqb);
 266 static Z_APDU *process_searchRequest(association *assoc, request *reqb,
 267     int *fd);
 268 static Z_APDU *response_searchRequest(association *assoc, request *reqb,
 269     bend_searchresult *bsrt, int *fd);
 270 static Z_APDU *process_presentRequest(association *assoc, request *reqb,
 271     int *fd);
 272 static Z_APDU *process_scanRequest(association *assoc, request *reqb, int *fd);
 273 static void process_close(association *assoc, request *reqb);
 274
 275 static FILE *apduf = 0; /* for use in static mode */
 276 static statserv_options_block *control_block = 0;
 277
 278 /*
 279  * Create and initialize a new association-handle.
 280  *  channel  : iochannel for the current line.
 281  *  link     : communications channel.
 282  * Returns: 0 or a new association handle.
 283  */
 284 association *create_association(IOCHAN channel, COMSTACK link)
 285 {
 286     association *new;
 287
 288     if (!control_block)
 289         control_block = statserv_getcontrol();
 290     if (!(new = xmalloc(sizeof(*new))))
 291         return 0;
 292     new->client_chan = channel;
 293     new->client_link = link;
 294     if (!(new->decode = odr_createmem(ODR_DECODE)) ||
 295         !(new->encode = odr_createmem(ODR_ENCODE)))
 296         return 0;
 297     if (*control_block->apdufile)
 298     {
 299         char filename[256];
 300         FILE *f;
 301
 302         strcpy(filename, control_block->apdufile);
 303         if (!(new->print = odr_createmem(ODR_PRINT)))
 304             return 0;
 305         if (*control_block->apdufile != '-')
 306         {
 307             strcpy(filename, control_block->apdufile);
 308             if (!control_block->dynamic)
 309             {
 310                 if (!apduf)
 311                 {
 312                     if (!(apduf = fopen(filename, "w")))
 313                     {
 314                         logf(LOG_WARN|LOG_ERRNO, "%s", filename);
 315                         return 0;
 316                     }
 317                     setvbuf(apduf, 0, _IONBF, 0);
 318                 }
 319                 f = apduf;
 320             }
 321             else
 322             {
 323                 sprintf(filename + strlen(filename), ".%d", getpid());
 324                 if (!(f = fopen(filename, "w")))
 325                 {
 326                     logf(LOG_WARN|LOG_ERRNO, "%s", filename);
 327                     return 0;
 328                 }
 329                 setvbuf(f, 0, _IONBF, 0);
 330             }
 331             odr_setprint(new->print, f);
 332         }
 333     }
 334     else
 335         new->print = 0;
 336     new->input_buffer = 0;
 337     new->input_buffer_len = 0;
 338     new->backend = 0;
 339     new->state = ASSOC_NEW;
 340     request_initq(&new->incoming);
 341     request_initq(&new->outgoing);
 342     new->proto = cs_getproto(link);
 343     return new;
 344 }
 345
 346 /*
 347  * Free association and release resources.
 348  */
 349 void destroy_association(association *h)
 350 {
 351     odr_destroy(h->decode);
 352     odr_destroy(h->encode);
 353     if (h->print)
 354         odr_destroy(h->print);
 355     if (h->input_buffer)
 356     xfree(h->input_buffer);
 357     if (h->backend)
 358         bend_close(h->backend);
 359     while (request_deq(&h->incoming));
 360     while (request_deq(&h->outgoing));
 361     request_delq(&h->incoming);
 362     request_delq(&h->outgoing);
 363     xfree(h);
 364 }
 365
 366 static void do_close(association *a, int reason, char *message)
 367 {
 368     Z_APDU apdu;
 369     Z_Close *cls = zget_Close(a->encode);
 370     request *req = request_get(&a->outgoing);
 371
 372     /* Purge request queue */
 373     while (request_deq(&a->incoming));
 374     while (request_deq(&a->outgoing));
 375     if (a->version >= 3)
 376     {
 377         logf(LOG_LOG, "Sending Close PDU, reason=%d, message=%s",
 378             reason, message ? message : "none");
 379         apdu.which = Z_APDU_close;
 380         apdu.u.close = cls;
 381         *cls->closeReason = reason;
 382         cls->diagnosticInformation = message;
 383         process_response(a, req, &apdu);
 384         iochan_settimeout(a->client_chan, 60);
 385     }
 386     else
 387     {
 388         logf(LOG_DEBUG, "v2 client. No Close PDU");
 389         iochan_setevent(a->client_chan, EVENT_TIMEOUT); /* force imm close */
 390     }
 391     a->state = ASSOC_DEAD;
 392 }
 393
 394 /*
 395  * This is where PDUs from the client are read and the further
 396  * processing is initiated. Flow of control moves down through the
 397  * various process_* functions below, until the encoded result comes back up
 398  * to the output handler in here.
 399  *
 400  *  h     : the I/O channel that has an outstanding event.
 401  *  event : the current outstanding event.
 402  */
 403 void ir_session(IOCHAN h, int event)
 404 {
 405     int res;
 406     association *assoc = iochan_getdata(h);
 407     COMSTACK conn = assoc->client_link;
 408     request *req;
 409
 410     assert(h && conn && assoc);
 411     if (event == EVENT_TIMEOUT)
 412     {
 413         if (assoc->state != ASSOC_UP)
 414         {
 415             logf(LOG_LOG, "Final timeout - closing connection.");
 416             cs_close(conn);
 417             destroy_association(assoc);
 418             iochan_destroy(h);
 419         }
 420         else
 421         {
 422             logf(LOG_LOG, "Session idle too long. Sending close.");
 423             do_close(assoc, Z_Close_lackOfActivity, 0);
 424         }
 425         return;
 426     }
 427     if (event & EVENT_INPUT || event & EVENT_WORK) /* input */
 428     {
 429         if (event & EVENT_INPUT)
 430         {
 431             logf(LOG_DEBUG, "ir_session (input)");
 432             assert(assoc && conn);
 433             /* We aren't speaking to this fellow */
 434             if (assoc->state == ASSOC_DEAD)
 435             {
 436                 logf(LOG_LOG, "Closed connection after reject");
 437                 cs_close(conn);
 438                 destroy_association(assoc);
 439                 iochan_destroy(h);
 440                 return;
 441             }
 442             if ((res = cs_get(conn, &assoc->input_buffer,
 443                 &assoc->input_buffer_len)) <= 0)
 444             {
 445                 logf(LOG_LOG, "Connection closed by client");
 446                 cs_close(conn);
 447                 destroy_association(assoc);
 448                 iochan_destroy(h);
 449                 return;
 450             }
 451             else if (res == 1) /* incomplete read - wait for more  */
 452                 return;
 453             if (cs_more(conn)) /* more stuff - call us again later, please */
 454                 iochan_setevent(h, EVENT_INPUT);
 455
 456             /* we got a complete PDU. Let's decode it */
 457             logf(LOG_DEBUG, "Got PDU, %d bytes", res);
 458             req = request_get(&assoc->incoming); /* get a new request structure */
 459             odr_reset(assoc->decode);
 460             odr_setbuf(assoc->decode, assoc->input_buffer, res, 0);
 461             if (!z_APDU(assoc->decode, &req->request, 0))
 462             {
 463                 logf(LOG_LOG, "ODR error on incoming PDU: %s [near byte %d] ",
 464                     odr_errmsg(odr_geterror(assoc->decode)),
 465                     odr_offset(assoc->decode));
 466                 logf(LOG_LOG, "PDU dump:");
 467                 odr_dumpBER(log_file(), assoc->input_buffer, res);
 468                 do_close(assoc, Z_Close_protocolError, "Malformed package");
 469                 return;
 470             }
 471             req->request_mem = odr_extract_mem(assoc->decode);
 472             if (assoc->print && !z_APDU(assoc->print, &req->request, 0))
 473             {
 474                 logf(LOG_WARN, "ODR print error: %s",
 475                     odr_errmsg(odr_geterror(assoc->print)));
 476                 odr_reset(assoc->print);
 477             }
 478             request_enq(&assoc->incoming, req);
 479         }
 480
 481         /* can we do something yet? */
 482         req = request_head(&assoc->incoming);
 483         if (req->state == REQUEST_IDLE)
 484             if (process_request(assoc) < 0)
 485                 do_close(assoc, Z_Close_systemProblem, "Unknown error");
 486     }
 487     if (event & EVENT_OUTPUT)
 488     {
 489         request *req = request_head(&assoc->outgoing);
 490
 491         logf(LOG_DEBUG, "ir_session (output)");
 492         req->state = REQUEST_PENDING;
 493         switch (res = cs_put(conn, req->response, req->len_response))
 494         {
 495             case -1:
 496                 logf(LOG_LOG, "Connection closed by client");
 497                 cs_close(conn);
 498                 destroy_association(assoc);
 499                 iochan_destroy(h);
 500                 break;
 501             case 0: /* all sent - release the request structure */
 502                 logf(LOG_DEBUG, "Wrote PDU, %d bytes", req->len_response);
 503                 nmem_destroy(req->request_mem);
 504                 request_deq(&assoc->outgoing);
 505                 request_release(req);
 506                 if (!request_head(&assoc->outgoing))
 507                     iochan_clearflag(h, EVENT_OUTPUT);
 508                 break;
 509             /* value of 1 -- partial send -- is simply ignored */
 510         }
 511     }
 512     if (event & EVENT_EXCEPT)
 513     {
 514         logf(LOG_DEBUG, "ir_session (exception)");
 515         cs_close(conn);
 516         destroy_association(assoc);
 517         iochan_destroy(h);
 518     }
 519 }
 520
 521 /*
 522  * Initiate request processing.
 523  */
 524 static int process_request(association *assoc)
 525 {
 526     request *req = request_head(&assoc->incoming);
 527     int fd = -1;
 528     Z_APDU *res;
 529
 530     logf(LOG_DEBUG, "process_request");
 531     assert(req && req->state == REQUEST_IDLE);
 532     switch (req->request->which)
 533     {
 534         case Z_APDU_initRequest:
 535             res = process_initRequest(assoc, req); break;
 536         case Z_APDU_searchRequest:
 537             res = process_searchRequest(assoc, req, &fd); break;
 538         case Z_APDU_presentRequest:
 539             res = process_presentRequest(assoc, req, &fd); break;
 540         case Z_APDU_scanRequest:
 541             res = process_scanRequest(assoc, req, &fd); break;
 542         case Z_APDU_close:
 543             process_close(assoc, req); return 0;
 544         default:
 545             logf(LOG_WARN, "Bad APDU received");
 546             return -1;
 547     }
 548     if (res)
 549     {
 550         logf(LOG_DEBUG, "  result immediately available");
 551         return process_response(assoc, req, res);
 552     }
 553     else if (fd < 0)
 554     {
 555         logf(LOG_WARN, "   bad result");
 556         return -1;
 557     }
 558     else /* no result yet - one will be provided later */
 559     {
 560         IOCHAN chan;
 561
 562         /* Set up an I/O handler for the fd supplied by the backend */
 563
 564         logf(LOG_DEBUG, "   establishing handler for result");
 565         req->state = REQUEST_PENDING;
 566         if (!(chan = iochan_create(fd, backend_response, EVENT_INPUT)))
 567             abort();
 568         iochan_setdata(chan, assoc);
 569         return 0;
 570     }
 571 }
 572
 573 /*
 574  * Handle message from the backend.
 575  */
 576 void backend_response(IOCHAN i, int event)
 577 {
 578     association *assoc = iochan_getdata(i);
 579     request *req = request_head(&assoc->incoming);
 580     Z_APDU *res;
 581     int fd;
 582
 583     logf(LOG_DEBUG, "backend_response");
 584     assert(assoc && req && req->state != REQUEST_IDLE);
 585     /* determine what it is we're waiting for */
 586     switch (req->request->which)
 587     {
 588         case Z_APDU_searchRequest:
 589             res = response_searchRequest(assoc, req, 0, &fd); break;
 590 #if 0
 591         case Z_APDU_presentRequest:
 592             res = response_presentRequest(assoc, req, 0, &fd); break;
 593         case Z_APDU_scanRequest:
 594             res = response_scanRequest(assoc, req, 0, &fd); break;
 595 #endif
 596         default:
 597             logf(LOG_WARN, "Serious programmer's lapse or bug");
 598             abort();
 599     }
 600     if ((res && process_response(assoc, req, res) < 0) || fd < 0)
 601     {
 602         logf(LOG_LOG, "Fatal error when talking to backend");
 603         do_close(assoc, Z_Close_systemProblem, 0);
 604         iochan_destroy(i);
 605         return;
 606     }
 607     else if (!res) /* no result yet - try again later */
 608     {
 609         logf(LOG_DEBUG, "   no result yet");
 610         iochan_setfd(i, fd); /* in case fd has changed */
 611     }
 612 }
 613
 614 /*
 615  * Encode response, and transfer the request structure to the outgoing queue.
 616  */
 617 static int process_response(association *assoc, request *req, Z_APDU *res)
 618 {
 619     odr_setbuf(assoc->encode, req->response, req->size_response, 1);
 620     if (!z_APDU(assoc->encode, &res, 0))
 621     {
 622         logf(LOG_WARN, "ODR error when encoding response: %s",
 623             odr_errmsg(odr_geterror(assoc->decode)));
 624         odr_reset(assoc->encode);
 625         return -1;
 626     }
 627     req->response = odr_getbuf(assoc->encode, &req->len_response,
 628         &req->size_response);
 629     odr_setbuf(assoc->encode, 0, 0, 0); /* don'txfree if we abort later */
 630     odr_reset(assoc->encode);
 631     if (assoc->print && !z_APDU(assoc->print, &res, 0))
 632     {
 633         logf(LOG_WARN, "ODR print error: %s",
 634             odr_errmsg(odr_geterror(assoc->print)));
 635         odr_reset(assoc->print);
 636     }
 637     /* change this when we make the backend reentrant */
 638     if (req == request_head(&assoc->incoming))
 639     {
 640         req->state = REQUEST_IDLE;
 641         request_deq(&assoc->incoming);
 642     }
 643     request_enq(&assoc->outgoing, req);
 644     /* turn the work over to the ir_session handler */
 645     iochan_setflag(assoc->client_chan, EVENT_OUTPUT);
 646     /* Is there more work to be done? give that to the input handler too */
 647     if (request_head(&assoc->incoming))
 648         iochan_setevent(assoc->client_chan, EVENT_WORK);
 649     return 0;
 650 }
 651
 652 /*
 653  * Handle init request.
 654  * At the moment, we don't check the options
 655  * anywhere else in the code - we just try not to do anything that would
 656  * break a naive client. We'll toss 'em into the association block when
 657  * we need them there.
 658  */
 659 static Z_APDU *process_initRequest(association *assoc, request *reqb)
 660 {
 661     Z_InitRequest *req = reqb->request->u.initRequest;
 662     Z_APDU *apdu = zget_APDU(assoc->encode, Z_APDU_initResponse);
 663     Z_InitResponse *resp = apdu->u.initResponse;
 664     bend_initrequest binitreq;
 665     bend_initresult *binitres;
 666     char options[100];
 667
 668     logf(LOG_LOG, "Got initRequest");
 669     if (req->implementationId)
 670         logf(LOG_LOG, "Id:        %s", req->implementationId);
 671     if (req->implementationName)
 672         logf(LOG_LOG, "Name:      %s", req->implementationName);
 673     if (req->implementationVersion)
 674         logf(LOG_LOG, "Version:   %s", req->implementationVersion);
 675
 676     binitreq.stream = assoc->encode;
 677     binitreq.configname = "default-config";
 678     binitreq.auth = req->idAuthentication;
 679     if (!(binitres = bend_init(&binitreq)))
 680     {
 681         logf(LOG_WARN, "Bad response from backend.");
 682         return 0;
 683     }
 684
 685     assoc->backend = binitres->handle;
 686     resp->referenceId = req->referenceId;
 687     *options = '\0';
 688     /* let's tell the client what we can do */
 689     if (ODR_MASK_GET(req->options, Z_Options_search))
 690     {
 691         ODR_MASK_SET(resp->options, Z_Options_search);
 692         strcat(options, "srch");
 693     }
 694     if (ODR_MASK_GET(req->options, Z_Options_present))
 695     {
 696         ODR_MASK_SET(resp->options, Z_Options_present);
 697         strcat(options, " prst");
 698     }
 699 #if 0
 700     if (ODR_MASK_GET(req->options, Z_Options_delSet))
 701     {
 702         ODR_MASK_SET(&options, Z_Options_delSet);
 703         strcat(options, " del");
 704     }
 705 #endif
 706     if (ODR_MASK_GET(req->options, Z_Options_namedResultSets))
 707     {
 708         ODR_MASK_SET(resp->options, Z_Options_namedResultSets);
 709         strcat(options, " namedresults");
 710     }
 711     if (ODR_MASK_GET(req->options, Z_Options_scan))
 712     {
 713         ODR_MASK_SET(resp->options, Z_Options_scan);
 714         strcat(options, " scan");
 715     }
 716     if (ODR_MASK_GET(req->options, Z_Options_concurrentOperations))
 717     {
 718         ODR_MASK_SET(resp->options, Z_Options_concurrentOperations);
 719         strcat(options, " concurop");
 720     }
 721
 722     if (ODR_MASK_GET(req->protocolVersion, Z_ProtocolVersion_1))
 723     {
 724         ODR_MASK_SET(resp->protocolVersion, Z_ProtocolVersion_1);
 725         assoc->version = 2; /* 1 & 2 are equivalent */
 726     }
 727     if (ODR_MASK_GET(req->protocolVersion, Z_ProtocolVersion_2))
 728     {
 729         ODR_MASK_SET(resp->protocolVersion, Z_ProtocolVersion_2);
 730         assoc->version = 2;
 731     }
 732     if (ODR_MASK_GET(req->protocolVersion, Z_ProtocolVersion_3))
 733     {
 734         ODR_MASK_SET(resp->protocolVersion, Z_ProtocolVersion_3);
 735         assoc->version = 3;
 736     }
 737     logf(LOG_LOG, "Negotiated to v%d: %s", assoc->version, options);
 738     assoc->maximumRecordSize = *req->maximumRecordSize;
 739     if (assoc->maximumRecordSize > control_block->maxrecordsize)
 740         assoc->maximumRecordSize = control_block->maxrecordsize;
 741     assoc->preferredMessageSize = *req->preferredMessageSize;
 742     if (assoc->preferredMessageSize > assoc->maximumRecordSize)
 743         assoc->preferredMessageSize = assoc->maximumRecordSize;
 744     resp->preferredMessageSize = &assoc->preferredMessageSize;
 745     resp->maximumRecordSize = &assoc->maximumRecordSize;
 746     resp->implementationName = "Index Data/YAZ Generic Frontend Server";
 747     if (binitres->errcode)
 748     {
 749         logf(LOG_LOG, "Connection rejected by backend.");
 750         *resp->result = 0;
 751         assoc->state = ASSOC_DEAD;
 752     }
 753     else
 754         assoc->state = ASSOC_UP;
 755     return apdu;
 756 }
 757
 758 /*
 759  * These functions should be merged.
 760  */
 761
 762 /*
 763  * nonsurrogate diagnostic record.
 764  */
 765 static Z_Records *diagrec(association *assoc, int error, char *addinfo)
 766 {
 767     Z_Records *rec = odr_malloc (assoc->encode, sizeof(*rec));
 768     oident bib1;
 769     int *err = odr_malloc (assoc->encode, sizeof(*err));
 770     Z_DiagRec *drec = odr_malloc (assoc->encode, sizeof(*drec));
 771     Z_DefaultDiagFormat *dr = odr_malloc (assoc->encode, sizeof(*dr));
 772
 773     bib1.proto = assoc->proto;
 774     bib1.oclass = CLASS_DIAGSET;
 775     bib1.value = VAL_BIB1;
 776
 777     logf(LOG_DEBUG, "Diagnostic: %d -- %s", error, addinfo ? addinfo :
 778         "NULL");
 779     *err = error;
 780     rec->which = Z_Records_NSD;
 781 #ifdef Z_95
 782     rec->u.nonSurrogateDiagnostic = drec;
 783     drec->which = Z_DiagRec_defaultFormat;
 784     drec->u.defaultFormat = dr;
 785 #else
 786     rec->u.nonSurrogateDiagnostic = dr;
 787 #endif
 788     dr->diagnosticSetId = oid_getoidbyent(&bib1);
 789     dr->condition = err;
 790     dr->which = Z_DiagForm_v2AddInfo;
 791     dr->addinfo = addinfo ? addinfo : "";
 792     return rec;
 793 }
 794
 795 /*
 796  * surrogate diagnostic.
 797  */
 798 static Z_NamePlusRecord *surrogatediagrec(association *assoc, char *dbname,
 799                                             int error, char *addinfo)
 800 {
 801     Z_NamePlusRecord *rec = odr_malloc (assoc->encode, sizeof(*rec));
 802     int *err = odr_malloc (assoc->encode, sizeof(*err));
 803     oident bib1;
 804     Z_DiagRec *drec = odr_malloc (assoc->encode, sizeof(*drec));
 805     Z_DefaultDiagFormat *dr = odr_malloc (assoc->encode, sizeof(*dr));
 806
 807     bib1.proto = assoc->proto;
 808     bib1.oclass = CLASS_DIAGSET;
 809     bib1.value = VAL_BIB1;
 810
 811     logf(LOG_DEBUG, "SurrogateDiagnotic: %d -- %s", error, addinfo);
 812     *err = error;
 813     rec->databaseName = dbname;
 814     rec->which = Z_NamePlusRecord_surrogateDiagnostic;
 815     rec->u.surrogateDiagnostic = drec;
 816     drec->which = Z_DiagRec_defaultFormat;
 817     drec->u.defaultFormat = dr;
 818     dr->diagnosticSetId = oid_getoidbyent(&bib1);
 819     dr->condition = err;
 820     dr->which = Z_DiagForm_v2AddInfo;
 821     dr->addinfo = addinfo ? addinfo : "";
 822     return rec;
 823 }
 824
 825 /*
 826  * multiple nonsurrogate diagnostics.
 827  */
 828 static Z_DiagRecs *diagrecs(association *assoc, int error, char *addinfo)
 829 {
 830     Z_DiagRecs *recs = odr_malloc (assoc->encode, sizeof(*recs));
 831     int *err = odr_malloc (assoc->encode, sizeof(*err));
 832     oident bib1;
 833     Z_DiagRec **recp = odr_malloc (assoc->encode, sizeof(*recp));
 834     Z_DiagRec *drec = odr_malloc (assoc->encode, sizeof(*drec));
 835     Z_DefaultDiagFormat *rec = odr_malloc (assoc->encode, sizeof(*rec));
 836
 837     logf(LOG_DEBUG, "DiagRecs: %d -- %s", error, addinfo);
 838     bib1.proto = assoc->proto;
 839     bib1.oclass = CLASS_DIAGSET;
 840     bib1.value = VAL_BIB1;
 841
 842     *err = error;
 843     recs->num_diagRecs = 1;
 844     recs->diagRecs = recp;
 845     recp[0] = drec;
 846     drec->which = Z_DiagRec_defaultFormat;
 847     drec->u.defaultFormat = rec;
 848
 849     rec->diagnosticSetId = oid_getoidbyent(&bib1);
 850     rec->condition = err;
 851     rec->which = Z_DiagForm_v2AddInfo;
 852     rec->addinfo = addinfo ? addinfo : "";
 853     return recs;
 854 }
 855
 856 static Z_Records *pack_records(association *a, char *setname, int start,
 857                                 int *num, Z_RecordComposition *comp,
 858                                 int *next, int *pres, oid_value format)
 859 {
 860     int recno, total_length = 0, toget = *num, dumped_records = 0;
 861     Z_Records *records = odr_malloc (a->encode, sizeof(*records));
 862     Z_NamePlusRecordList *reclist = odr_malloc (a->encode, sizeof(*reclist));
 863     Z_NamePlusRecord **list = odr_malloc (a->encode, sizeof(*list) * toget);
 864     oident recform;
 865
 866     records->which = Z_Records_DBOSD;
 867     records->u.databaseOrSurDiagnostics = reclist;
 868     reclist->num_records = 0;
 869     reclist->records = list;
 870     *pres = Z_PRES_SUCCESS;
 871     *num = 0;
 872     *next = 0;
 873
 874     logf(LOG_DEBUG, "Request to pack %d+%d", start, toget);
 875     logf(LOG_DEBUG, "pms=%d, mrs=%d", a->preferredMessageSize,
 876         a->maximumRecordSize);
 877     for (recno = start; reclist->num_records < toget; recno++)
 878     {
 879         bend_fetchrequest freq;
 880         bend_fetchresult *fres;
 881         Z_NamePlusRecord *thisrec;
 882         Z_DatabaseRecord *thisext;
 883         int this_length;
 884
 885         /*
 886          * we get the number of bytes allocated on the stream before any
 887          * allocation done by the backend - this should give us a reasonable
 888          * idea of the total size of the data so far.
 889          */
 890         total_length = odr_total(a->encode) - dumped_records;
 891         freq.setname = setname;
 892         freq.number = recno;
 893         freq.comp = comp;
 894         freq.format = format;
 895         freq.stream = a->encode;
 896         if (!(fres = bend_fetch(a->backend, &freq, 0)))
 897         {
 898             *pres = Z_PRES_FAILURE;
 899             return diagrec(a, 2, "Backend interface problem");
 900         }
 901         /* backend should be able to signal whether error is system-wide
 902            or only pertaining to current record */
 903         if (fres->errcode)
 904         {
 905             *pres = Z_PRES_FAILURE;
 906             return diagrec(a, fres->errcode, fres->errstring);
 907         }
 908         if (fres->len >= 0)
 909             this_length = fres->len;
 910         else
 911             this_length = odr_total(a->encode) - total_length;
 912         logf(LOG_DEBUG, "  fetched record, len=%d, total=%d",
 913             this_length, total_length);
 914         if (this_length + total_length > a->preferredMessageSize)
 915         {
 916             /* record is small enough, really */
 917             if (this_length <= a->preferredMessageSize)
 918             {
 919                 logf(LOG_DEBUG, "  Dropped last normal-sized record");
 920                 *pres = Z_PRES_PARTIAL_2;
 921                 break;
 922             }
 923             /* record can only be fetched by itself */
 924             if (this_length < a->maximumRecordSize)
 925             {
 926                 logf(LOG_DEBUG, "  Record > prefmsgsz");
 927                 if (toget > 1)
 928                 {
 929                     logf(LOG_DEBUG, "  Dropped it");
 930                     reclist->records[reclist->num_records] =
 931                          surrogatediagrec(a, fres->basename, 16, 0);
 932                     reclist->num_records++;
 933                     *next = fres->last_in_set ? 0 : recno + 1;
 934                     dumped_records += this_length;
 935                     continue;
 936                 }
 937             }
 938             else /* too big entirely */
 939             {
 940                 logf(LOG_DEBUG, "Record > maxrcdsz");
 941                 reclist->records[reclist->num_records] =
 942                     surrogatediagrec(a, fres->basename, 17, 0);
 943                 reclist->num_records++;
 944                 *next = fres->last_in_set ? 0 : recno + 1;
 945                 dumped_records += this_length;
 946                 continue;
 947             }
 948         }
 949         if (!(thisrec = odr_malloc(a->encode, sizeof(*thisrec))))
 950             return 0;
 951         if (!(thisrec->databaseName = odr_malloc(a->encode,
 952             strlen(fres->basename) + 1)))
 953             return 0;
 954         strcpy(thisrec->databaseName, fres->basename);
 955         thisrec->which = Z_NamePlusRecord_databaseRecord;
 956         if (!(thisrec->u.databaseRecord = thisext = odr_malloc(a->encode,
 957             sizeof(Z_DatabaseRecord))))
 958             return 0;
 959         recform.proto = a->proto;
 960         recform.oclass = CLASS_RECSYN;
 961         recform.value = fres->format;
 962         thisext->direct_reference = odr_oiddup(a->encode,
 963             oid_getoidbyent(&recform));
 964         thisext->indirect_reference = 0;
 965         thisext->descriptor = 0;
 966         if (fres->len < 0) /* Structured data */
 967         {
 968             switch (fres->format)
 969             {
 970                 case VAL_SUTRS: thisext->which = Z_External_sutrs; break;
 971                 case VAL_GRS1: thisext->which = Z_External_grs1; break;
 972                 case VAL_EXPLAIN: thisext->which = Z_External_explainRecord;
 973                     break;
 974                 case VAL_SUMMARY: thisext->which = Z_External_summary; break;
 975                 case VAL_OPAC: thisext->which = Z_External_OPAC; break;
 976
 977                 default:
 978                     logf(LOG_FATAL, "Unknown structured format from backend.");
 979                     return 0;
 980             }
 981
 982             /*
 983              * We cheat on the pointers here. Obviously, the record field
 984              * of the backend-fetch structure should have been a union for
 985              * correctness, but we're stuck with this for backwards
 986              * compatibility.
 987              */
 988             thisext->u.grs1 = (Z_GenericRecord*) fres->record;
 989         }
 990         else if (fres->format == VAL_SUTRS) /* SUTRS is a single-ASN.1-type */
 991         {
 992             Odr_oct *sutrs = odr_malloc(a->encode, sizeof(*sutrs));
 993
 994             thisext->which = Z_External_sutrs;
 995             thisext->u.sutrs = sutrs;
 996             sutrs->buf = odr_malloc(a->encode, fres->len);
 997             sutrs->len = sutrs->size = fres->len;
 998             memcpy(sutrs->buf, fres->record, fres->len);
 999         }
1000         else /* octet-aligned record. */
1001         {
1002             thisext->which = Z_External_octet;
1003             if (!(thisext->u.octet_aligned = odr_malloc(a->encode,
1004                 sizeof(Odr_oct))))
1005                 return 0;
1006             if (!(thisext->u.octet_aligned->buf = odr_malloc(a->encode,
1007                 fres->len)))
1008                 return 0;
1009             memcpy(thisext->u.octet_aligned->buf, fres->record, fres->len);
1010             thisext->u.octet_aligned->len = thisext->u.octet_aligned->size =
1011                 fres->len;
1012         }
1013         reclist->records[reclist->num_records] = thisrec;
1014         reclist->num_records++;
1015         *next = fres->last_in_set ? 0 : recno + 1;
1016     }
1017     *num = reclist->num_records;
1018     return records;
1019 }
1020
1021 static Z_APDU *process_searchRequest(association *assoc, request *reqb,
1022     int *fd)
1023 {
1024     Z_SearchRequest *req = reqb->request->u.searchRequest;
1025     bend_searchrequest bsrq;
1026     bend_searchresult *bsrt;
1027
1028     logf(LOG_LOG, "Got SearchRequest.");
1029
1030     bsrq.setname = req->resultSetName;
1031     bsrq.replace_set = *req->replaceIndicator;
1032     bsrq.num_bases = req->num_databaseNames;
1033     bsrq.basenames = req->databaseNames;
1034     bsrq.query = req->query;
1035     bsrq.stream = assoc->encode;
1036
1037     if (!(bsrt = bend_search(assoc->backend, &bsrq, fd)))
1038         return 0;
1039     return response_searchRequest(assoc, reqb, bsrt, fd);
1040 }
1041
1042 bend_searchresult *bend_searchresponse(void *handle) {return 0;}
1043
1044 /*
1045  * Prepare a searchresponse based on the backend results. We probably want
1046  * to look at making the fetching of records nonblocking as well, but
1047  * so far, we'll keep things simple.
1048  * If bsrt is null, that means we're called in response to a communications
1049  * event, and we'll have to get the response for ourselves.
1050  */
1051 static Z_APDU *response_searchRequest(association *assoc, request *reqb,
1052     bend_searchresult *bsrt, int *fd)
1053 {
1054     Z_SearchRequest *req = reqb->request->u.searchRequest;
1055     Z_APDU *apdu = odr_malloc (assoc->encode, sizeof(*apdu));
1056     Z_SearchResponse *resp = odr_malloc (assoc->encode, sizeof(*resp));
1057     int *nulint = odr_malloc (assoc->encode, sizeof(*nulint));
1058     bool_t *sr = odr_malloc (assoc->encode, sizeof(*sr));
1059     int *next = odr_malloc (assoc->encode, sizeof(*next));
1060     int *none = odr_malloc (assoc->encode, sizeof(*none));
1061
1062     *nulint = 0;
1063     *sr = 1;
1064     *next = 0;
1065     *none = Z_RES_NONE;
1066
1067     apdu->which = Z_APDU_searchResponse;
1068     apdu->u.searchResponse = resp;
1069     resp->referenceId = req->referenceId;
1070     resp->additionalSearchInfo = 0;
1071     resp->otherInfo = 0;
1072     *fd = -1;
1073     if (!bsrt && !(bsrt = bend_searchresponse(assoc->backend)))
1074     {
1075         logf(LOG_FATAL, "Bad result from backend");
1076         return 0;
1077     }
1078     else if (bsrt->errcode)
1079     {
1080         resp->records = diagrec(assoc, bsrt->errcode, bsrt->errstring);
1081         resp->resultCount = nulint;
1082         resp->numberOfRecordsReturned = nulint;
1083         resp->nextResultSetPosition = nulint;
1084         resp->searchStatus = nulint;
1085         resp->resultSetStatus = none;
1086         resp->presentStatus = 0;
1087     }
1088     else
1089     {
1090         int *toget = odr_malloc (assoc->encode, sizeof(*toget));
1091         int *presst = odr_malloc (assoc->encode, sizeof(*presst));
1092         Z_RecordComposition comp, *compp = 0;
1093
1094         *toget = 0;
1095         *presst = 0;
1096         resp->records = 0;
1097         resp->resultCount = &bsrt->hits;
1098
1099         comp.which = Z_RecordComp_simple;
1100         /* how many records does the user agent want, then? */
1101         if (bsrt->hits <= *req->smallSetUpperBound)
1102         {
1103             *toget = bsrt->hits;
1104             if ((comp.u.simple = req->smallSetElementSetNames))
1105                 compp = &comp;
1106         }
1107         else if (bsrt->hits < *req->largeSetLowerBound)
1108         {
1109             *toget = *req->mediumSetPresentNumber;
1110             if (*toget > bsrt->hits)
1111                 *toget = bsrt->hits;
1112             if ((comp.u.simple = req->mediumSetElementSetNames))
1113                 compp = &comp;
1114         }
1115         else
1116             *toget = 0;
1117
1118         if (*toget && !resp->records)
1119         {
1120             oident *prefformat;
1121             oid_value form;
1122
1123             if (!(prefformat = oid_getentbyoid(req->preferredRecordSyntax)) ||
1124                 prefformat->oclass != CLASS_RECSYN)
1125                 form = VAL_NONE;
1126             else
1127                 form = prefformat->value;
1128             resp->records = pack_records(assoc, req->resultSetName, 1,
1129                 toget, compp, next, presst, form);
1130             if (!resp->records)
1131                 return 0;
1132             resp->numberOfRecordsReturned = toget;
1133             resp->nextResultSetPosition = next;
1134             resp->searchStatus = sr;
1135             resp->resultSetStatus = 0;
1136             resp->presentStatus = presst;
1137         }
1138         else
1139         {
1140             if (*resp->resultCount)
1141                 *next = 1;
1142             resp->numberOfRecordsReturned = nulint;
1143             resp->nextResultSetPosition = next;
1144             resp->searchStatus = sr;
1145             resp->resultSetStatus = 0;
1146             resp->presentStatus = 0;
1147         }
1148     }
1149     return apdu;
1150 }
1151
1152 /*
1153  * Maybe we got a little over-friendly when we designed bend_fetch to
1154  * get only one record at a time. Some backends can optimise multiple-record
1155  * fetches, and at any rate, there is some overhead involved in
1156  * all that selecting and hopping around. Problem is, of course, that the
1157  * frontend can't know ahead of time how many records it'll need to
1158  * fill the negotiated PDU size. Annoying. Segmentation or not, Z/SR
1159  * is downright lousy as a bulk data transfer protocol.
1160  *
1161  * To start with, we'll do the fetching of records from the backend
1162  * in one operation: To save some trips in and out of the event-handler,
1163  * and to simplify the interface to pack_records. At any rate, asynch
1164  * operation is more fun in operations that have an unpredictable execution
1165  * speed - which is normally more true for search than for present.
1166  */
1167 static Z_APDU *process_presentRequest(association *assoc, request *reqb,
1168     int *fd)
1169 {
1170     Z_PresentRequest *req = reqb->request->u.presentRequest;
1171     Z_APDU *apdu = odr_malloc (assoc->encode, sizeof(*apdu));
1172     Z_PresentResponse *resp = odr_malloc (assoc->encode, sizeof(*resp));
1173     int *presst = odr_malloc (assoc->encode, sizeof(*presst));
1174     int *next = odr_malloc (assoc->encode, sizeof(*next));
1175     int *num = odr_malloc (assoc->encode, sizeof(*num));
1176     oident *prefformat;
1177     oid_value form;
1178
1179     logf(LOG_LOG, "Got PresentRequest.");
1180     *presst = 0;
1181     *next = 0;
1182     *num = 0;
1183
1184     apdu->which = Z_APDU_presentResponse;
1185     apdu->u.presentResponse = resp;
1186     resp->referenceId = req->referenceId;
1187     resp->otherInfo = 0;
1188
1189     if (!(prefformat = oid_getentbyoid(req->preferredRecordSyntax)) ||
1190         prefformat->oclass != CLASS_RECSYN)
1191         form = VAL_NONE;
1192     else
1193         form = prefformat->value;
1194     *num = *req->numberOfRecordsRequested;
1195     resp->records = pack_records(assoc, req->resultSetId,
1196         *req->resultSetStartPoint, num, req->recordComposition, next,
1197         presst, form);
1198     if (!resp->records)
1199         return 0;
1200     resp->numberOfRecordsReturned = num;
1201     resp->presentStatus = presst;
1202     resp->nextResultSetPosition = next;
1203
1204     return apdu;
1205 }
1206
1207 /*
1208  * Scan was implemented rather in a hurry, and with support for only the basic
1209  * elements of the service in the backend API. Suggestions are welcome.
1210  */
1211 static Z_APDU *process_scanRequest(association *assoc, request *reqb, int *fd)
1212 {
1213     Z_ScanRequest *req = reqb->request->u.scanRequest;
1214     Z_APDU *apdu = odr_malloc (assoc->encode, sizeof(*apdu));
1215     Z_ScanResponse *res = odr_malloc (assoc->encode, sizeof(*res));
1216     int *scanStatus = odr_malloc (assoc->encode, sizeof(*scanStatus));
1217     int *numberOfEntriesReturned =
1218          odr_malloc (assoc->encode, sizeof(*numberOfEntriesReturned));
1219     Z_ListEntries *ents = odr_malloc (assoc->encode, sizeof(*ents));
1220     oident *attent;
1221     bend_scanrequest srq;
1222     bend_scanresult *srs;
1223     oident *attset;
1224
1225     logf(LOG_LOG, "Got scanrequest");
1226     *scanStatus = Z_Scan_failure;
1227     *numberOfEntriesReturned = 0;
1228
1229     apdu->which = Z_APDU_scanResponse;
1230     apdu->u.scanResponse = res;
1231     res->referenceId = req->referenceId;
1232     res->stepSize = 0;
1233     res->scanStatus = scanStatus;
1234     res->numberOfEntriesReturned = numberOfEntriesReturned;
1235     res->positionOfTerm = 0;
1236     res->entries = ents;
1237     ents->which = Z_ListEntries_nonSurrogateDiagnostics;
1238     res->attributeSet = 0;
1239     res->otherInfo = 0;
1240
1241     if (req->attributeSet && (!(attent = oid_getentbyoid(req->attributeSet)) ||
1242         attent->oclass != CLASS_ATTSET || attent->value != VAL_BIB1))
1243         ents->u.nonSurrogateDiagnostics = diagrecs(assoc, 121, 0);
1244     else if (req->stepSize && *req->stepSize > 0)
1245         ents->u.nonSurrogateDiagnostics = diagrecs(assoc, 205, 0);
1246     else
1247     {
1248         if (req->termListAndStartPoint->term->which == Z_Term_general)
1249             logf(LOG_DEBUG, " term: '%.*s'",
1250                 req->termListAndStartPoint->term->u.general->len,
1251                 req->termListAndStartPoint->term->u.general->buf);
1252         srq.num_bases = req->num_databaseNames;
1253         srq.basenames = req->databaseNames;
1254         srq.num_entries = *req->numberOfTermsRequested;
1255         srq.term = req->termListAndStartPoint;
1256         srq.stream = assoc->encode;
1257         if (!(attset = oid_getentbyoid(req->attributeSet)) ||
1258             attset->oclass != CLASS_RECSYN)
1259             srq.attributeset = VAL_NONE;
1260         else
1261             srq.attributeset = attset->value;
1262         srq.term_position = req->preferredPositionInResponse ?
1263             *req->preferredPositionInResponse : 1;
1264         if (!(srs = bend_scan(assoc->backend, &srq, 0)))
1265             ents->u.nonSurrogateDiagnostics = diagrecs(assoc, 2, 0);
1266         else if (srs->errcode)
1267             ents->u.nonSurrogateDiagnostics = diagrecs(assoc,
1268                 srs->errcode, srs->errstring);
1269         else
1270         {
1271             int i;
1272             Z_Entries *list = odr_malloc (assoc->encode, sizeof(*list));
1273             Z_Entry **tab = odr_malloc (assoc->encode,
1274                                         sizeof(*tab) * srs->num_entries);
1275
1276             if (srs->status == BEND_SCAN_PARTIAL)
1277                 *scanStatus = Z_Scan_partial_5;
1278             else
1279                 *scanStatus = Z_Scan_success;
1280             ents->which = Z_ListEntries_entries;
1281             ents->u.entries = list;
1282             list->entries = tab;
1283             for (i = 0; i < srs->num_entries; i++)
1284             {
1285                 Z_Entry *e;
1286                 Z_TermInfo *t;
1287                 Odr_oct *o;
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 }