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 1.69  1997-09-30 11:48:12  adam
   8  * Fixed bug introduced by previous commit.
   9  *
  10  * Revision 1.68  1997/09/29 13:18:59  adam
  11  * Added function, oid_ent_to_oid, to replace the function
  12  * oid_getoidbyent, which is not thread safe.
  13  *
  14  * Revision 1.67  1997/09/17 12:10:40  adam
  15  * YAZ version 1.4.
  16  *
  17  * Revision 1.66  1997/09/05 15:26:44  adam
  18  * Added ODR encode in search and scen bend request structures.
  19  * Fixed a few enums that caused trouble with C++.
  20  *
  21  * Revision 1.65  1997/09/01 08:53:01  adam
  22  * New windows NT/95 port using MSV5.0. The test server 'ztest' was
  23  * moved a separate directory. MSV5.0 project server.dsp created.
  24  * As an option, the server can now operate as an NT service.
  25  *
  26  * Revision 1.64  1997/04/30 08:52:11  quinn
  27  * Null
  28  *
  29  * Revision 1.63  1996/10/11  11:57:26  quinn
  30  * Smallish
  31  *
  32  * Revision 1.62  1996/07/06  19:58:35  quinn
  33  * System headerfiles gathered in yconfig
  34  *
  35  * Revision 1.61  1996/06/10  08:56:16  quinn
  36  * Work on Summary.
  37  *
  38  * Revision 1.60  1996/05/30  11:03:10  quinn
  39  * Fixed NextresultSetPosition bug fixed.
  40  *
  41  * Revision 1.59  1996/05/14  09:26:46  quinn
  42  * Added attribute set to scan backend
  43  *
  44  * Revision 1.58  1996/02/20  12:53:04  quinn
  45  * Chanes to SCAN
  46  *
  47  * Revision 1.57  1996/01/02  08:57:47  quinn
  48  * Changed enums in the ASN.1 .h files to #defines. Changed oident.class to oclass
  49  *
  50  * Revision 1.56  1995/12/14  11:09:57  quinn
  51  * Work on Explain
  52  *
  53  * Revision 1.55  1995/11/08  17:41:37  quinn
  54  * Smallish.
  55  *
  56  * Revision 1.54  1995/11/08  15:11:29  quinn
  57  * Log of close transmit.
  58  *
  59  * Revision 1.53  1995/11/01  13:54:58  quinn
  60  * Minor adjustments
  61  *
  62  * Revision 1.52  1995/11/01  12:19:13  quinn
  63  * Second attempt to fix same bug.
  64  *
  65  * Revision 1.50  1995/10/25  16:58:32  quinn
  66  * Simple.
  67  *
  68  * Revision 1.49  1995/10/16  13:51:53  quinn
  69  * Changes to provide Especs to the backend.
  70  *
  71  * Revision 1.48  1995/10/06  08:51:20  quinn
  72  * Added Write-buffer.
  73  *
  74  * Revision 1.47  1995/08/29  14:24:16  quinn
  75  * Added second half of close-handshake
  76  *
  77  * Revision 1.46  1995/08/29  11:17:58  quinn
  78  * Added code to receive close
  79  *
  80  * Revision 1.45  1995/08/21  09:11:00  quinn
  81  * Smallish fixes to suppport new formats.
  82  *
  83  * Revision 1.44  1995/08/17  12:45:25  quinn
  84  * Fixed minor problems with GRS-1. Added support in c&s.
  85  *
  86  * Revision 1.43  1995/08/15  12:00:31  quinn
  87  * Updated External
  88  *
  89  * Revision 1.42  1995/08/15  11:16:50  quinn
  90  *
  91  * Revision 1.41  1995/08/02  10:23:06  quinn
  92  * Smallish
  93  *
  94  * Revision 1.40  1995/07/31  14:34:26  quinn
  95  * Fixed bug in process_searchResponse (numberOfRecordsReturned).
  96  *
  97  * Revision 1.39  1995/06/27  13:21:00  quinn
  98  * SUTRS support
  99  *
 100  * Revision 1.38  1995/06/19  12:39:11  quinn
 101  * Fixed bug in timeout code. Added BER dumper.
 102  *
 103  * Revision 1.37  1995/06/16  13:16:14  quinn
 104  * Fixed Defaultdiagformat.
 105  *
 106  * Revision 1.36  1995/06/16  10:31:36  quinn
 107  * Added session timeout.
 108  *
 109  * Revision 1.35  1995/06/15  07:45:14  quinn
 110  * Moving to v3.
 111  *
 112  * Revision 1.34  1995/06/14  15:26:46  quinn
 113  * *** empty log message ***
 114  *
 115  * Revision 1.33  1995/06/06  14:57:05  quinn
 116  * Better diagnostics.
 117  *
 118  * Revision 1.32  1995/06/06  08:41:44  quinn
 119  * Better diagnostics.
 120  *
 121  * Revision 1.31  1995/06/06  08:15:37  quinn
 122  * Cosmetic.
 123  *
 124  * Revision 1.30  1995/06/05  10:53:32  quinn
 125  * Added a better SCAN.
 126  *
 127  * Revision 1.29  1995/06/01  11:25:03  quinn
 128  * Smallish.
 129  *
 130  * Revision 1.28  1995/06/01  11:21:01  quinn
 131  * Attempting to fix a bug in pack-records. replaced break with continue
 132  * for large records, according to standard.
 133  *
 134  * Revision 1.27  1995/05/29  08:12:06  quinn
 135  * Moved oid to util
 136  *
 137  * Revision 1.26  1995/05/18  13:02:12  quinn
 138  * Smallish.
 139  *
 140  * Revision 1.25  1995/05/17  08:42:26  quinn
 141  * Transfer auth info to backend. Allow backend to reject init gracefully.
 142  *
 143  * Revision 1.24  1995/05/16  08:51:04  quinn
 144  * License, documentation, and memory fixes
 145  *
 146  * Revision 1.23  1995/05/15  13:25:10  quinn
 147  * Fixed memory bug.
 148  *
 149  * Revision 1.22  1995/05/15  11:56:39  quinn
 150  * Asynchronous facilities. Restructuring of seshigh code.
 151  *
 152  * Revision 1.21  1995/05/02  08:53:19  quinn
 153  * Trying in vain to fix comm with ISODE
 154  *
 155  * Revision 1.20  1995/04/20  15:13:00  quinn
 156  * Cosmetic
 157  *
 158  * Revision 1.19  1995/04/18  08:15:34  quinn
 159  * Added dynamic memory allocation on encoding (whew). Code is now somewhat
 160  * neater. We'll make the same change for decoding one day.
 161  *
 162  * Revision 1.18  1995/04/17  11:28:25  quinn
 163  * Smallish
 164  *
 165  * Revision 1.17  1995/04/10  10:23:36  quinn
 166  * Some work to add scan and other things.
 167  *
 168  * Revision 1.16  1995/03/31  09:18:55  quinn
 169  * Added logging.
 170  *
 171  * Revision 1.15  1995/03/30  14:03:23  quinn
 172  * Added RFC1006 as separate library
 173  *
 174  * Revision 1.14  1995/03/30  12:18:17  quinn
 175  * Fixed bug.
 176  *
 177  * Revision 1.13  1995/03/30  09:09:24  quinn
 178  * Added state-handle and some support for asynchronous activities.
 179  *
 180  * Revision 1.12  1995/03/29  15:40:16  quinn
 181  * Ongoing work. Statserv is now dynamic by default
 182  *
 183  * Revision 1.11  1995/03/28  09:16:21  quinn
 184  * Added record packing to the search request
 185  *
 186  * Revision 1.10  1995/03/27  08:34:24  quinn
 187  * Added dynamic server functionality.
 188  * Released bindings to session.c (is now redundant)
 189  *
 190  * Revision 1.9  1995/03/22  15:01:26  quinn
 191  * Adjusting record packing.
 192  *
 193  * Revision 1.8  1995/03/22  10:13:21  quinn
 194  * Working on record packer
 195  *
 196  * Revision 1.7  1995/03/21  15:53:31  quinn
 197  * Little changes.
 198  *
 199  * Revision 1.6  1995/03/21  12:30:09  quinn
 200  * Beginning to add support for record packing.
 201  *
 202  * Revision 1.5  1995/03/17  10:44:13  quinn
 203  * Added catch of null-string in makediagrec
 204  *
 205  * Revision 1.4  1995/03/17  10:18:08  quinn
 206  * Added memory management.
 207  *
 208  * Revision 1.3  1995/03/16  17:42:39  quinn
 209  * Little changes
 210  *
 211  * Revision 1.2  1995/03/16  13:29:01  quinn
 212  * Partitioned server.
 213  *
 214  * Revision 1.1  1995/03/15  16:02:10  quinn
 215  * Modded session.c to seshigh.c
 216  *
 217  */
 218
 219 /*
 220  * Frontend server logic.
 221  *
 222  * This code receives incoming APDUs, and handles client requests by means
 223  * of the backend API.
 224  *
 225  * Some of the code is getting quite involved, compared to simpler servers -
 226  * primarily because it is asynchronous both in the communication with
 227  * the user and the backend. We think the complexity will pay off in
 228  * the form of greater flexibility when more asynchronous facilities
 229  * are implemented.
 230  *
 231  * Memory management has become somewhat involved. In the simple case, where
 232  * only one PDU is pending at a time, it will simply reuse the same memory,
 233  * once it has found its working size. When we enable multiple concurrent
 234  * operations, perhaps even with multiple parallel calls to the backend, it
 235  * will maintain a pool of buffers for encoding and decoding, trying to
 236  * minimize memory allocation/deallocation during normal operation.
 237  *
 238  * TODOs include (and will be done in order of public interest):
 239  *
 240  * Support for EXPLAIN - provide simple meta-database system.
 241  * Support for access control.
 242  * Support for resource control.
 243  * Support for extended services - primarily Item Order.
 244  * Rest of Z39.50-1994
 245  *
 246  */
 247
 248 #include <yconfig.h>
 249 #include <stdlib.h>
 250 #include <stdio.h>
 251 #ifdef WINDOWS
 252 #include <process.h>
 253 #else
 254 #include <unistd.h>
 255 #endif
 256 #include <assert.h>
 257
 258 #include <xmalloc.h>
 259 #include <comstack.h>
 260 #include "eventl.h"
 261 #include "session.h"
 262 #include <proto.h>
 263 #include <oid.h>
 264 #include <log.h>
 265 #include <statserv.h>
 266
 267 #include <backend.h>
 268
 269 static int process_request(association *assoc);
 270 void backend_response(IOCHAN i, int event);
 271 static int process_response(association *assoc, request *req, Z_APDU *res);
 272 static Z_APDU *process_initRequest(association *assoc, request *reqb);
 273 static Z_APDU *process_searchRequest(association *assoc, request *reqb,
 274     int *fd);
 275 static Z_APDU *response_searchRequest(association *assoc, request *reqb,
 276     bend_searchresult *bsrt, int *fd);
 277 static Z_APDU *process_presentRequest(association *assoc, request *reqb,
 278     int *fd);
 279 static Z_APDU *process_scanRequest(association *assoc, request *reqb, int *fd);
 280 static void process_close(association *assoc, request *reqb);
 281
 282 static FILE *apduf = 0; /* for use in static mode */
 283 static statserv_options_block *control_block = 0;
 284
 285 /*
 286  * Create and initialize a new association-handle.
 287  *  channel  : iochannel for the current line.
 288  *  link     : communications channel.
 289  * Returns: 0 or a new association handle.
 290  */
 291 association *create_association(IOCHAN channel, COMSTACK link)
 292 {
 293     association *new;
 294
 295     if (!control_block)
 296         control_block = statserv_getcontrol();
 297     if (!(new = xmalloc(sizeof(*new))))
 298         return 0;
 299     new->client_chan = channel;
 300     new->client_link = link;
 301     if (!(new->decode = odr_createmem(ODR_DECODE)) ||
 302         !(new->encode = odr_createmem(ODR_ENCODE)))
 303         return 0;
 304     if (*control_block->apdufile)
 305     {
 306         char filename[256];
 307         FILE *f;
 308
 309         strcpy(filename, control_block->apdufile);
 310         if (!(new->print = odr_createmem(ODR_PRINT)))
 311             return 0;
 312         if (*control_block->apdufile != '-')
 313         {
 314             strcpy(filename, control_block->apdufile);
 315             if (!control_block->dynamic)
 316             {
 317                 if (!apduf)
 318                 {
 319                     if (!(apduf = fopen(filename, "w")))
 320                     {
 321                         logf(LOG_WARN|LOG_ERRNO, "%s", filename);
 322                         return 0;
 323                     }
 324                     setvbuf(apduf, 0, _IONBF, 0);
 325                 }
 326                 f = apduf;
 327             }
 328             else
 329             {
 330                 sprintf(filename + strlen(filename), ".%d", getpid());
 331                 if (!(f = fopen(filename, "w")))
 332                 {
 333                     logf(LOG_WARN|LOG_ERRNO, "%s", filename);
 334                     return 0;
 335                 }
 336                 setvbuf(f, 0, _IONBF, 0);
 337             }
 338             odr_setprint(new->print, f);
 339         }
 340     }
 341     else
 342         new->print = 0;
 343     new->input_buffer = 0;
 344     new->input_buffer_len = 0;
 345     new->backend = 0;
 346     new->state = ASSOC_NEW;
 347     request_initq(&new->incoming);
 348     request_initq(&new->outgoing);
 349     new->proto = cs_getproto(link);
 350     return new;
 351 }
 352
 353 /*
 354  * Free association and release resources.
 355  */
 356 void destroy_association(association *h)
 357 {
 358     odr_destroy(h->decode);
 359     odr_destroy(h->encode);
 360     if (h->print)
 361         odr_destroy(h->print);
 362     if (h->input_buffer)
 363     xfree(h->input_buffer);
 364     if (h->backend)
 365         bend_close(h->backend);
 366     while (request_deq(&h->incoming));
 367     while (request_deq(&h->outgoing));
 368     request_delq(&h->incoming);
 369     request_delq(&h->outgoing);
 370     xfree(h);
 371 }
 372
 373 static void do_close(association *a, int reason, char *message)
 374 {
 375     Z_APDU apdu;
 376     Z_Close *cls = zget_Close(a->encode);
 377     request *req = request_get(&a->outgoing);
 378
 379     /* Purge request queue */
 380     while (request_deq(&a->incoming));
 381     while (request_deq(&a->outgoing));
 382     if (a->version >= 3)
 383     {
 384         logf(LOG_LOG, "Sending Close PDU, reason=%d, message=%s",
 385             reason, message ? message : "none");
 386         apdu.which = Z_APDU_close;
 387         apdu.u.close = cls;
 388         *cls->closeReason = reason;
 389         cls->diagnosticInformation = message;
 390         process_response(a, req, &apdu);
 391         iochan_settimeout(a->client_chan, 60);
 392     }
 393     else
 394     {
 395         logf(LOG_DEBUG, "v2 client. No Close PDU");
 396         iochan_setevent(a->client_chan, EVENT_TIMEOUT); /* force imm close */
 397     }
 398     a->state = ASSOC_DEAD;
 399 }
 400
 401 /*
 402  * This is where PDUs from the client are read and the further
 403  * processing is initiated. Flow of control moves down through the
 404  * various process_* functions below, until the encoded result comes back up
 405  * to the output handler in here.
 406  *
 407  *  h     : the I/O channel that has an outstanding event.
 408  *  event : the current outstanding event.
 409  */
 410 void ir_session(IOCHAN h, int event)
 411 {
 412     int res;
 413     association *assoc = iochan_getdata(h);
 414     COMSTACK conn = assoc->client_link;
 415     request *req;
 416
 417     assert(h && conn && assoc);
 418     if (event == EVENT_TIMEOUT)
 419     {
 420         if (assoc->state != ASSOC_UP)
 421         {
 422             logf(LOG_LOG, "Final timeout - closing connection.");
 423             cs_close(conn);
 424             destroy_association(assoc);
 425             iochan_destroy(h);
 426         }
 427         else
 428         {
 429             logf(LOG_LOG, "Session idle too long. Sending close.");
 430             do_close(assoc, Z_Close_lackOfActivity, 0);
 431         }
 432         return;
 433     }
 434     if (event & EVENT_INPUT || event & EVENT_WORK) /* input */
 435     {
 436         if (event & EVENT_INPUT)
 437         {
 438             logf(LOG_DEBUG, "ir_session (input)");
 439             assert(assoc && conn);
 440             /* We aren't speaking to this fellow */
 441             if (assoc->state == ASSOC_DEAD)
 442             {
 443                 logf(LOG_LOG, "Closed connection after reject");
 444                 cs_close(conn);
 445                 destroy_association(assoc);
 446                 iochan_destroy(h);
 447                 return;
 448             }
 449             if ((res = cs_get(conn, &assoc->input_buffer,
 450                 &assoc->input_buffer_len)) <= 0)
 451             {
 452                 logf(LOG_LOG, "Connection closed by client");
 453                 cs_close(conn);
 454                 destroy_association(assoc);
 455                 iochan_destroy(h);
 456                 return;
 457             }
 458             else if (res == 1) /* incomplete read - wait for more  */
 459                 return;
 460             if (cs_more(conn)) /* more stuff - call us again later, please */
 461                 iochan_setevent(h, EVENT_INPUT);
 462
 463             /* we got a complete PDU. Let's decode it */
 464             logf(LOG_DEBUG, "Got PDU, %d bytes", res);
 465             req = request_get(&assoc->incoming); /* get a new request structure */
 466             odr_reset(assoc->decode);
 467             odr_setbuf(assoc->decode, assoc->input_buffer, res, 0);
 468             if (!z_APDU(assoc->decode, &req->request, 0))
 469             {
 470                 logf(LOG_LOG, "ODR error on incoming PDU: %s [near byte %d] ",
 471                     odr_errmsg(odr_geterror(assoc->decode)),
 472                     odr_offset(assoc->decode));
 473                 logf(LOG_LOG, "PDU dump:");
 474                 odr_dumpBER(log_file(), assoc->input_buffer, res);
 475                 do_close(assoc, Z_Close_protocolError, "Malformed package");
 476                 return;
 477             }
 478             req->request_mem = odr_extract_mem(assoc->decode);
 479             if (assoc->print && !z_APDU(assoc->print, &req->request, 0))
 480             {
 481                 logf(LOG_WARN, "ODR print error: %s",
 482                     odr_errmsg(odr_geterror(assoc->print)));
 483                 odr_reset(assoc->print);
 484             }
 485             request_enq(&assoc->incoming, req);
 486         }
 487
 488         /* can we do something yet? */
 489         req = request_head(&assoc->incoming);
 490         if (req->state == REQUEST_IDLE)
 491             if (process_request(assoc) < 0)
 492                 do_close(assoc, Z_Close_systemProblem, "Unknown error");
 493     }
 494     if (event & EVENT_OUTPUT)
 495     {
 496         request *req = request_head(&assoc->outgoing);
 497
 498         logf(LOG_DEBUG, "ir_session (output)");
 499         req->state = REQUEST_PENDING;
 500         switch (res = cs_put(conn, req->response, req->len_response))
 501         {
 502             case -1:
 503                 logf(LOG_LOG, "Connection closed by client");
 504                 cs_close(conn);
 505                 destroy_association(assoc);
 506                 iochan_destroy(h);
 507                 break;
 508             case 0: /* all sent - release the request structure */
 509                 logf(LOG_DEBUG, "Wrote PDU, %d bytes", req->len_response);
 510                 nmem_destroy(req->request_mem);
 511                 request_deq(&assoc->outgoing);
 512                 request_release(req);
 513                 if (!request_head(&assoc->outgoing))
 514                     iochan_clearflag(h, EVENT_OUTPUT);
 515                 break;
 516             /* value of 1 -- partial send -- is simply ignored */
 517         }
 518     }
 519     if (event & EVENT_EXCEPT)
 520     {
 521         logf(LOG_DEBUG, "ir_session (exception)");
 522         cs_close(conn);
 523         destroy_association(assoc);
 524         iochan_destroy(h);
 525     }
 526 }
 527
 528 /*
 529  * Initiate request processing.
 530  */
 531 static int process_request(association *assoc)
 532 {
 533     request *req = request_head(&assoc->incoming);
 534     int fd = -1;
 535     Z_APDU *res;
 536
 537     logf(LOG_DEBUG, "process_request");
 538     assert(req && req->state == REQUEST_IDLE);
 539     switch (req->request->which)
 540     {
 541         case Z_APDU_initRequest:
 542             res = process_initRequest(assoc, req); break;
 543         case Z_APDU_searchRequest:
 544             res = process_searchRequest(assoc, req, &fd); break;
 545         case Z_APDU_presentRequest:
 546             res = process_presentRequest(assoc, req, &fd); break;
 547         case Z_APDU_scanRequest:
 548             res = process_scanRequest(assoc, req, &fd); break;
 549         case Z_APDU_close:
 550             process_close(assoc, req); return 0;
 551         default:
 552             logf(LOG_WARN, "Bad APDU received");
 553             return -1;
 554     }
 555     if (res)
 556     {
 557         logf(LOG_DEBUG, "  result immediately available");
 558         return process_response(assoc, req, res);
 559     }
 560     else if (fd < 0)
 561     {
 562         logf(LOG_WARN, "   bad result");
 563         return -1;
 564     }
 565     else /* no result yet - one will be provided later */
 566     {
 567         IOCHAN chan;
 568
 569         /* Set up an I/O handler for the fd supplied by the backend */
 570
 571         logf(LOG_DEBUG, "   establishing handler for result");
 572         req->state = REQUEST_PENDING;
 573         if (!(chan = iochan_create(fd, backend_response, EVENT_INPUT)))
 574             abort();
 575         iochan_setdata(chan, assoc);
 576         return 0;
 577     }
 578 }
 579
 580 /*
 581  * Handle message from the backend.
 582  */
 583 void backend_response(IOCHAN i, int event)
 584 {
 585     association *assoc = iochan_getdata(i);
 586     request *req = request_head(&assoc->incoming);
 587     Z_APDU *res;
 588     int fd;
 589
 590     logf(LOG_DEBUG, "backend_response");
 591     assert(assoc && req && req->state != REQUEST_IDLE);
 592     /* determine what it is we're waiting for */
 593     switch (req->request->which)
 594     {
 595         case Z_APDU_searchRequest:
 596             res = response_searchRequest(assoc, req, 0, &fd); break;
 597 #if 0
 598         case Z_APDU_presentRequest:
 599             res = response_presentRequest(assoc, req, 0, &fd); break;
 600         case Z_APDU_scanRequest:
 601             res = response_scanRequest(assoc, req, 0, &fd); break;
 602 #endif
 603         default:
 604             logf(LOG_WARN, "Serious programmer's lapse or bug");
 605             abort();
 606     }
 607     if ((res && process_response(assoc, req, res) < 0) || fd < 0)
 608     {
 609         logf(LOG_LOG, "Fatal error when talking to backend");
 610         do_close(assoc, Z_Close_systemProblem, 0);
 611         iochan_destroy(i);
 612         return;
 613     }
 614     else if (!res) /* no result yet - try again later */
 615     {
 616         logf(LOG_DEBUG, "   no result yet");
 617         iochan_setfd(i, fd); /* in case fd has changed */
 618     }
 619 }
 620
 621 /*
 622  * Encode response, and transfer the request structure to the outgoing queue.
 623  */
 624 static int process_response(association *assoc, request *req, Z_APDU *res)
 625 {
 626     odr_setbuf(assoc->encode, req->response, req->size_response, 1);
 627     if (!z_APDU(assoc->encode, &res, 0))
 628     {
 629         logf(LOG_WARN, "ODR error when encoding response: %s",
 630             odr_errmsg(odr_geterror(assoc->decode)));
 631         odr_reset(assoc->encode);
 632         return -1;
 633     }
 634     req->response = odr_getbuf(assoc->encode, &req->len_response,
 635         &req->size_response);
 636     odr_setbuf(assoc->encode, 0, 0, 0); /* don'txfree if we abort later */
 637     odr_reset(assoc->encode);
 638     if (assoc->print && !z_APDU(assoc->print, &res, 0))
 639     {
 640         logf(LOG_WARN, "ODR print error: %s",
 641             odr_errmsg(odr_geterror(assoc->print)));
 642         odr_reset(assoc->print);
 643     }
 644     /* change this when we make the backend reentrant */
 645     if (req == request_head(&assoc->incoming))
 646     {
 647         req->state = REQUEST_IDLE;
 648         request_deq(&assoc->incoming);
 649     }
 650     request_enq(&assoc->outgoing, req);
 651     /* turn the work over to the ir_session handler */
 652     iochan_setflag(assoc->client_chan, EVENT_OUTPUT);
 653     /* Is there more work to be done? give that to the input handler too */
 654     if (request_head(&assoc->incoming))
 655         iochan_setevent(assoc->client_chan, EVENT_WORK);
 656     return 0;
 657 }
 658
 659 /*
 660  * Handle init request.
 661  * At the moment, we don't check the options
 662  * anywhere else in the code - we just try not to do anything that would
 663  * break a naive client. We'll toss 'em into the association block when
 664  * we need them there.
 665  */
 666 static Z_APDU *process_initRequest(association *assoc, request *reqb)
 667 {
 668     Z_InitRequest *req = reqb->request->u.initRequest;
 669     Z_APDU *apdu = zget_APDU(assoc->encode, Z_APDU_initResponse);
 670     Z_InitResponse *resp = apdu->u.initResponse;
 671     bend_initrequest binitreq;
 672     bend_initresult *binitres;
 673     char options[100];
 674
 675     logf(LOG_LOG, "Got initRequest");
 676     if (req->implementationId)
 677         logf(LOG_LOG, "Id:        %s", req->implementationId);
 678     if (req->implementationName)
 679         logf(LOG_LOG, "Name:      %s", req->implementationName);
 680     if (req->implementationVersion)
 681         logf(LOG_LOG, "Version:   %s", req->implementationVersion);
 682
 683     binitreq.stream = assoc->encode;
 684     binitreq.configname = "default-config";
 685     binitreq.auth = req->idAuthentication;
 686     if (!(binitres = bend_init(&binitreq)))
 687     {
 688         logf(LOG_WARN, "Bad response from backend.");
 689         return 0;
 690     }
 691
 692     assoc->backend = binitres->handle;
 693     resp->referenceId = req->referenceId;
 694     *options = '\0';
 695     /* let's tell the client what we can do */
 696     if (ODR_MASK_GET(req->options, Z_Options_search))
 697     {
 698         ODR_MASK_SET(resp->options, Z_Options_search);
 699         strcat(options, "srch");
 700     }
 701     if (ODR_MASK_GET(req->options, Z_Options_present))
 702     {
 703         ODR_MASK_SET(resp->options, Z_Options_present);
 704         strcat(options, " prst");
 705     }
 706 #if 0
 707     if (ODR_MASK_GET(req->options, Z_Options_delSet))
 708     {
 709         ODR_MASK_SET(&options, Z_Options_delSet);
 710         strcat(options, " del");
 711     }
 712 #endif
 713     if (ODR_MASK_GET(req->options, Z_Options_namedResultSets))
 714     {
 715         ODR_MASK_SET(resp->options, Z_Options_namedResultSets);
 716         strcat(options, " namedresults");
 717     }
 718     if (ODR_MASK_GET(req->options, Z_Options_scan))
 719     {
 720         ODR_MASK_SET(resp->options, Z_Options_scan);
 721         strcat(options, " scan");
 722     }
 723     if (ODR_MASK_GET(req->options, Z_Options_concurrentOperations))
 724     {
 725         ODR_MASK_SET(resp->options, Z_Options_concurrentOperations);
 726         strcat(options, " concurop");
 727     }
 728
 729     if (ODR_MASK_GET(req->protocolVersion, Z_ProtocolVersion_1))
 730     {
 731         ODR_MASK_SET(resp->protocolVersion, Z_ProtocolVersion_1);
 732         assoc->version = 2; /* 1 & 2 are equivalent */
 733     }
 734     if (ODR_MASK_GET(req->protocolVersion, Z_ProtocolVersion_2))
 735     {
 736         ODR_MASK_SET(resp->protocolVersion, Z_ProtocolVersion_2);
 737         assoc->version = 2;
 738     }
 739     if (ODR_MASK_GET(req->protocolVersion, Z_ProtocolVersion_3))
 740     {
 741         ODR_MASK_SET(resp->protocolVersion, Z_ProtocolVersion_3);
 742         assoc->version = 3;
 743     }
 744     logf(LOG_LOG, "Negotiated to v%d: %s", assoc->version, options);
 745     assoc->maximumRecordSize = *req->maximumRecordSize;
 746     if (assoc->maximumRecordSize > control_block->maxrecordsize)
 747         assoc->maximumRecordSize = control_block->maxrecordsize;
 748     assoc->preferredMessageSize = *req->preferredMessageSize;
 749     if (assoc->preferredMessageSize > assoc->maximumRecordSize)
 750         assoc->preferredMessageSize = assoc->maximumRecordSize;
 751     resp->preferredMessageSize = &assoc->preferredMessageSize;
 752     resp->maximumRecordSize = &assoc->maximumRecordSize;
 753     resp->implementationName = "Index Data/YAZ Generic Frontend Server";
 754     if (binitres->errcode)
 755     {
 756         logf(LOG_LOG, "Connection rejected by backend.");
 757         *resp->result = 0;
 758         assoc->state = ASSOC_DEAD;
 759     }
 760     else
 761         assoc->state = ASSOC_UP;
 762     return apdu;
 763 }
 764
 765 /*
 766  * These functions should be merged.
 767  */
 768
 769 /*
 770  * nonsurrogate diagnostic record.
 771  */
 772 static Z_Records *diagrec(association *assoc, int error, char *addinfo)
 773 {
 774     int oid[OID_SIZE];
 775     Z_Records *rec = odr_malloc (assoc->encode, sizeof(*rec));
 776     oident bib1;
 777     int *err = odr_malloc (assoc->encode, sizeof(*err));
 778     Z_DiagRec *drec = odr_malloc (assoc->encode, sizeof(*drec));
 779     Z_DefaultDiagFormat *dr = odr_malloc (assoc->encode, sizeof(*dr));
 780
 781     bib1.proto = assoc->proto;
 782     bib1.oclass = CLASS_DIAGSET;
 783     bib1.value = VAL_BIB1;
 784
 785     logf(LOG_DEBUG, "Diagnostic: %d -- %s", error, addinfo ? addinfo :
 786         "NULL");
 787     *err = error;
 788     rec->which = Z_Records_NSD;
 789 #ifdef Z_95
 790     rec->u.nonSurrogateDiagnostic = drec;
 791     drec->which = Z_DiagRec_defaultFormat;
 792     drec->u.defaultFormat = dr;
 793 #else
 794     rec->u.nonSurrogateDiagnostic = dr;
 795 #endif
 796     dr->diagnosticSetId = odr_oiddup (assoc->encode,
 797                                       oid_ent_to_oid(&bib1, oid));
 798     dr->condition = err;
 799     dr->which = Z_DiagForm_v2AddInfo;
 800     dr->addinfo = addinfo ? addinfo : "";
 801     return rec;
 802 }
 803
 804 /*
 805  * surrogate diagnostic.
 806  */
 807 static Z_NamePlusRecord *surrogatediagrec(association *assoc, char *dbname,
 808                                             int error, char *addinfo)
 809 {
 810     int oid[OID_SIZE];
 811     Z_NamePlusRecord *rec = odr_malloc (assoc->encode, sizeof(*rec));
 812     int *err = odr_malloc (assoc->encode, sizeof(*err));
 813     oident bib1;
 814     Z_DiagRec *drec = odr_malloc (assoc->encode, sizeof(*drec));
 815     Z_DefaultDiagFormat *dr = odr_malloc (assoc->encode, sizeof(*dr));
 816
 817     bib1.proto = assoc->proto;
 818     bib1.oclass = CLASS_DIAGSET;
 819     bib1.value = VAL_BIB1;
 820
 821     logf(LOG_DEBUG, "SurrogateDiagnotic: %d -- %s", error, addinfo);
 822     *err = error;
 823     rec->databaseName = dbname;
 824     rec->which = Z_NamePlusRecord_surrogateDiagnostic;
 825     rec->u.surrogateDiagnostic = drec;
 826     drec->which = Z_DiagRec_defaultFormat;
 827     drec->u.defaultFormat = dr;
 828     dr->diagnosticSetId = odr_oiddup (assoc->encode,
 829                                       oid_ent_to_oid(&bib1, oid));
 830     dr->condition = err;
 831     dr->which = Z_DiagForm_v2AddInfo;
 832     dr->addinfo = addinfo ? addinfo : "";
 833     return rec;
 834 }
 835
 836 /*
 837  * multiple nonsurrogate diagnostics.
 838  */
 839 static Z_DiagRecs *diagrecs(association *assoc, int error, char *addinfo)
 840 {
 841     int oid[OID_SIZE];
 842     Z_DiagRecs *recs = odr_malloc (assoc->encode, sizeof(*recs));
 843     int *err = odr_malloc (assoc->encode, sizeof(*err));
 844     oident bib1;
 845     Z_DiagRec **recp = odr_malloc (assoc->encode, sizeof(*recp));
 846     Z_DiagRec *drec = odr_malloc (assoc->encode, sizeof(*drec));
 847     Z_DefaultDiagFormat *rec = odr_malloc (assoc->encode, sizeof(*rec));
 848
 849     logf(LOG_DEBUG, "DiagRecs: %d -- %s", error, addinfo);
 850     bib1.proto = assoc->proto;
 851     bib1.oclass = CLASS_DIAGSET;
 852     bib1.value = VAL_BIB1;
 853
 854     *err = error;
 855     recs->num_diagRecs = 1;
 856     recs->diagRecs = recp;
 857     recp[0] = drec;
 858     drec->which = Z_DiagRec_defaultFormat;
 859     drec->u.defaultFormat = rec;
 860
 861     rec->diagnosticSetId = odr_oiddup (assoc->encode,
 862                                       oid_ent_to_oid(&bib1, oid));
 863     rec->condition = err;
 864     rec->which = Z_DiagForm_v2AddInfo;
 865     rec->addinfo = addinfo ? addinfo : "";
 866     return recs;
 867 }
 868
 869 static Z_Records *pack_records(association *a, char *setname, int start,
 870                                 int *num, Z_RecordComposition *comp,
 871                                 int *next, int *pres, oid_value format)
 872 {
 873     int oid[OID_SIZE];
 874     int recno, total_length = 0, toget = *num, dumped_records = 0;
 875     Z_Records *records = odr_malloc (a->encode, sizeof(*records));
 876     Z_NamePlusRecordList *reclist = odr_malloc (a->encode, sizeof(*reclist));
 877     Z_NamePlusRecord **list = odr_malloc (a->encode, sizeof(*list) * toget);
 878     oident recform;
 879
 880     records->which = Z_Records_DBOSD;
 881     records->u.databaseOrSurDiagnostics = reclist;
 882     reclist->num_records = 0;
 883     reclist->records = list;
 884     *pres = Z_PRES_SUCCESS;
 885     *num = 0;
 886     *next = 0;
 887
 888     logf(LOG_DEBUG, "Request to pack %d+%d", start, toget);
 889     logf(LOG_DEBUG, "pms=%d, mrs=%d", a->preferredMessageSize,
 890         a->maximumRecordSize);
 891     for (recno = start; reclist->num_records < toget; recno++)
 892     {
 893         bend_fetchrequest freq;
 894         bend_fetchresult *fres;
 895         Z_NamePlusRecord *thisrec;
 896         Z_DatabaseRecord *thisext;
 897         int this_length;
 898
 899         /*
 900          * we get the number of bytes allocated on the stream before any
 901          * allocation done by the backend - this should give us a reasonable
 902          * idea of the total size of the data so far.
 903          */
 904         total_length = odr_total(a->encode) - dumped_records;
 905         freq.setname = setname;
 906         freq.number = recno;
 907         freq.comp = comp;
 908         freq.format = format;
 909         freq.stream = a->encode;
 910         if (!(fres = bend_fetch(a->backend, &freq, 0)))
 911         {
 912             *pres = Z_PRES_FAILURE;
 913             return diagrec(a, 2, "Backend interface problem");
 914         }
 915         /* backend should be able to signal whether error is system-wide
 916            or only pertaining to current record */
 917         if (fres->errcode)
 918         {
 919             *pres = Z_PRES_FAILURE;
 920             return diagrec(a, fres->errcode, fres->errstring);
 921         }
 922         if (fres->len >= 0)
 923             this_length = fres->len;
 924         else
 925             this_length = odr_total(a->encode) - total_length;
 926         logf(LOG_DEBUG, "  fetched record, len=%d, total=%d",
 927             this_length, total_length);
 928         if (this_length + total_length > a->preferredMessageSize)
 929         {
 930             /* record is small enough, really */
 931             if (this_length <= a->preferredMessageSize)
 932             {
 933                 logf(LOG_DEBUG, "  Dropped last normal-sized record");
 934                 *pres = Z_PRES_PARTIAL_2;
 935                 break;
 936             }
 937             /* record can only be fetched by itself */
 938             if (this_length < a->maximumRecordSize)
 939             {
 940                 logf(LOG_DEBUG, "  Record > prefmsgsz");
 941                 if (toget > 1)
 942                 {
 943                     logf(LOG_DEBUG, "  Dropped it");
 944                     reclist->records[reclist->num_records] =
 945                          surrogatediagrec(a, fres->basename, 16, 0);
 946                     reclist->num_records++;
 947                     *next = fres->last_in_set ? 0 : recno + 1;
 948                     dumped_records += this_length;
 949                     continue;
 950                 }
 951             }
 952             else /* too big entirely */
 953             {
 954                 logf(LOG_DEBUG, "Record > maxrcdsz");
 955                 reclist->records[reclist->num_records] =
 956                     surrogatediagrec(a, fres->basename, 17, 0);
 957                 reclist->num_records++;
 958                 *next = fres->last_in_set ? 0 : recno + 1;
 959                 dumped_records += this_length;
 960                 continue;
 961             }
 962         }
 963         if (!(thisrec = odr_malloc(a->encode, sizeof(*thisrec))))
 964             return 0;
 965         if (!(thisrec->databaseName = odr_malloc(a->encode,
 966             strlen(fres->basename) + 1)))
 967             return 0;
 968         strcpy(thisrec->databaseName, fres->basename);
 969         thisrec->which = Z_NamePlusRecord_databaseRecord;
 970         if (!(thisrec->u.databaseRecord = thisext = odr_malloc(a->encode,
 971             sizeof(Z_DatabaseRecord))))
 972             return 0;
 973         recform.proto = a->proto;
 974         recform.oclass = CLASS_RECSYN;
 975         recform.value = fres->format;
 976         thisext->direct_reference = odr_oiddup(a->encode,
 977                                                oid_ent_to_oid(&recform, oid));
 978         thisext->indirect_reference = 0;
 979         thisext->descriptor = 0;
 980         if (fres->len < 0) /* Structured data */
 981         {
 982             switch (fres->format)
 983             {
 984                 case VAL_SUTRS: thisext->which = Z_External_sutrs; break;
 985                 case VAL_GRS1: thisext->which = Z_External_grs1; break;
 986                 case VAL_EXPLAIN: thisext->which = Z_External_explainRecord;
 987                     break;
 988                 case VAL_SUMMARY: thisext->which = Z_External_summary; break;
 989                 case VAL_OPAC: thisext->which = Z_External_OPAC; break;
 990
 991                 default:
 992                     logf(LOG_FATAL, "Unknown structured format from backend.");
 993                     return 0;
 994             }
 995
 996             /*
 997              * We cheat on the pointers here. Obviously, the record field
 998              * of the backend-fetch structure should have been a union for
 999              * correctness, but we're stuck with this for backwards
1000              * compatibility.
1001              */
1002             thisext->u.grs1 = (Z_GenericRecord*) fres->record;
1003         }
1004         else if (fres->format == VAL_SUTRS) /* SUTRS is a single-ASN.1-type */
1005         {
1006             Odr_oct *sutrs = odr_malloc(a->encode, sizeof(*sutrs));
1007
1008             thisext->which = Z_External_sutrs;
1009             thisext->u.sutrs = sutrs;
1010             sutrs->buf = odr_malloc(a->encode, fres->len);
1011             sutrs->len = sutrs->size = fres->len;
1012             memcpy(sutrs->buf, fres->record, fres->len);
1013         }
1014         else /* octet-aligned record. */
1015         {
1016             thisext->which = Z_External_octet;
1017             if (!(thisext->u.octet_aligned = odr_malloc(a->encode,
1018                 sizeof(Odr_oct))))
1019                 return 0;
1020             if (!(thisext->u.octet_aligned->buf = odr_malloc(a->encode,
1021                 fres->len)))
1022                 return 0;
1023             memcpy(thisext->u.octet_aligned->buf, fres->record, fres->len);
1024             thisext->u.octet_aligned->len = thisext->u.octet_aligned->size =
1025                 fres->len;
1026         }
1027         reclist->records[reclist->num_records] = thisrec;
1028         reclist->num_records++;
1029         *next = fres->last_in_set ? 0 : recno + 1;
1030     }
1031     *num = reclist->num_records;
1032     return records;
1033 }
1034
1035 static Z_APDU *process_searchRequest(association *assoc, request *reqb,
1036     int *fd)
1037 {
1038     Z_SearchRequest *req = reqb->request->u.searchRequest;
1039     bend_searchrequest bsrq;
1040     bend_searchresult *bsrt;
1041
1042     logf(LOG_LOG, "Got SearchRequest.");
1043
1044     bsrq.setname = req->resultSetName;
1045     bsrq.replace_set = *req->replaceIndicator;
1046     bsrq.num_bases = req->num_databaseNames;
1047     bsrq.basenames = req->databaseNames;
1048     bsrq.query = req->query;
1049     bsrq.stream = assoc->encode;
1050
1051     if (!(bsrt = bend_search(assoc->backend, &bsrq, fd)))
1052         return 0;
1053     return response_searchRequest(assoc, reqb, bsrt, fd);
1054 }
1055
1056 bend_searchresult *bend_searchresponse(void *handle) {return 0;}
1057
1058 /*
1059  * Prepare a searchresponse based on the backend results. We probably want
1060  * to look at making the fetching of records nonblocking as well, but
1061  * so far, we'll keep things simple.
1062  * If bsrt is null, that means we're called in response to a communications
1063  * event, and we'll have to get the response for ourselves.
1064  */
1065 static Z_APDU *response_searchRequest(association *assoc, request *reqb,
1066     bend_searchresult *bsrt, int *fd)
1067 {
1068     Z_SearchRequest *req = reqb->request->u.searchRequest;
1069     Z_APDU *apdu = odr_malloc (assoc->encode, sizeof(*apdu));
1070     Z_SearchResponse *resp = odr_malloc (assoc->encode, sizeof(*resp));
1071     int *nulint = odr_malloc (assoc->encode, sizeof(*nulint));
1072     bool_t *sr = odr_malloc (assoc->encode, sizeof(*sr));
1073     int *next = odr_malloc (assoc->encode, sizeof(*next));
1074     int *none = odr_malloc (assoc->encode, sizeof(*none));
1075
1076     *nulint = 0;
1077     *sr = 1;
1078     *next = 0;
1079     *none = Z_RES_NONE;
1080
1081     apdu->which = Z_APDU_searchResponse;
1082     apdu->u.searchResponse = resp;
1083     resp->referenceId = req->referenceId;
1084     resp->additionalSearchInfo = 0;
1085     resp->otherInfo = 0;
1086     *fd = -1;
1087     if (!bsrt && !(bsrt = bend_searchresponse(assoc->backend)))
1088     {
1089         logf(LOG_FATAL, "Bad result from backend");
1090         return 0;
1091     }
1092     else if (bsrt->errcode)
1093     {
1094         resp->records = diagrec(assoc, bsrt->errcode, bsrt->errstring);
1095         resp->resultCount = nulint;
1096         resp->numberOfRecordsReturned = nulint;
1097         resp->nextResultSetPosition = nulint;
1098         resp->searchStatus = nulint;
1099         resp->resultSetStatus = none;
1100         resp->presentStatus = 0;
1101     }
1102     else
1103     {
1104         int *toget = odr_malloc (assoc->encode, sizeof(*toget));
1105         int *presst = odr_malloc (assoc->encode, sizeof(*presst));
1106         Z_RecordComposition comp, *compp = 0;
1107
1108         *toget = 0;
1109         *presst = 0;
1110         resp->records = 0;
1111         resp->resultCount = &bsrt->hits;
1112
1113         comp.which = Z_RecordComp_simple;
1114         /* how many records does the user agent want, then? */
1115         if (bsrt->hits <= *req->smallSetUpperBound)
1116         {
1117             *toget = bsrt->hits;
1118             if ((comp.u.simple = req->smallSetElementSetNames))
1119                 compp = &comp;
1120         }
1121         else if (bsrt->hits < *req->largeSetLowerBound)
1122         {
1123             *toget = *req->mediumSetPresentNumber;
1124             if (*toget > bsrt->hits)
1125                 *toget = bsrt->hits;
1126             if ((comp.u.simple = req->mediumSetElementSetNames))
1127                 compp = &comp;
1128         }
1129         else
1130             *toget = 0;
1131
1132         if (*toget && !resp->records)
1133         {
1134             oident *prefformat;
1135             oid_value form;
1136
1137             if (!(prefformat = oid_getentbyoid(req->preferredRecordSyntax)) ||
1138                 prefformat->oclass != CLASS_RECSYN)
1139                 form = VAL_NONE;
1140             else
1141                 form = prefformat->value;
1142             resp->records = pack_records(assoc, req->resultSetName, 1,
1143                 toget, compp, next, presst, form);
1144             if (!resp->records)
1145                 return 0;
1146             resp->numberOfRecordsReturned = toget;
1147             resp->nextResultSetPosition = next;
1148             resp->searchStatus = sr;
1149             resp->resultSetStatus = 0;
1150             resp->presentStatus = presst;
1151         }
1152         else
1153         {
1154             if (*resp->resultCount)
1155                 *next = 1;
1156             resp->numberOfRecordsReturned = nulint;
1157             resp->nextResultSetPosition = next;
1158             resp->searchStatus = sr;
1159             resp->resultSetStatus = 0;
1160             resp->presentStatus = 0;
1161         }
1162     }
1163     return apdu;
1164 }
1165
1166 /*
1167  * Maybe we got a little over-friendly when we designed bend_fetch to
1168  * get only one record at a time. Some backends can optimise multiple-record
1169  * fetches, and at any rate, there is some overhead involved in
1170  * all that selecting and hopping around. Problem is, of course, that the
1171  * frontend can't know ahead of time how many records it'll need to
1172  * fill the negotiated PDU size. Annoying. Segmentation or not, Z/SR
1173  * is downright lousy as a bulk data transfer protocol.
1174  *
1175  * To start with, we'll do the fetching of records from the backend
1176  * in one operation: To save some trips in and out of the event-handler,
1177  * and to simplify the interface to pack_records. At any rate, asynch
1178  * operation is more fun in operations that have an unpredictable execution
1179  * speed - which is normally more true for search than for present.
1180  */
1181 static Z_APDU *process_presentRequest(association *assoc, request *reqb,
1182     int *fd)
1183 {
1184     Z_PresentRequest *req = reqb->request->u.presentRequest;
1185     Z_APDU *apdu = odr_malloc (assoc->encode, sizeof(*apdu));
1186     Z_PresentResponse *resp = odr_malloc (assoc->encode, sizeof(*resp));
1187     int *presst = odr_malloc (assoc->encode, sizeof(*presst));
1188     int *next = odr_malloc (assoc->encode, sizeof(*next));
1189     int *num = odr_malloc (assoc->encode, sizeof(*num));
1190     oident *prefformat;
1191     oid_value form;
1192
1193     logf(LOG_LOG, "Got PresentRequest.");
1194     *presst = 0;
1195     *next = 0;
1196     *num = 0;
1197
1198     apdu->which = Z_APDU_presentResponse;
1199     apdu->u.presentResponse = resp;
1200     resp->referenceId = req->referenceId;
1201     resp->otherInfo = 0;
1202
1203     if (!(prefformat = oid_getentbyoid(req->preferredRecordSyntax)) ||
1204         prefformat->oclass != CLASS_RECSYN)
1205         form = VAL_NONE;
1206     else
1207         form = prefformat->value;
1208     *num = *req->numberOfRecordsRequested;
1209     resp->records = pack_records(assoc, req->resultSetId,
1210         *req->resultSetStartPoint, num, req->recordComposition, next,
1211         presst, form);
1212     if (!resp->records)
1213         return 0;
1214     resp->numberOfRecordsReturned = num;
1215     resp->presentStatus = presst;
1216     resp->nextResultSetPosition = next;
1217
1218     return apdu;
1219 }
1220
1221 /*
1222  * Scan was implemented rather in a hurry, and with support for only the basic
1223  * elements of the service in the backend API. Suggestions are welcome.
1224  */
1225 static Z_APDU *process_scanRequest(association *assoc, request *reqb, int *fd)
1226 {
1227     Z_ScanRequest *req = reqb->request->u.scanRequest;
1228     Z_APDU *apdu = odr_malloc (assoc->encode, sizeof(*apdu));
1229     Z_ScanResponse *res = odr_malloc (assoc->encode, sizeof(*res));
1230     int *scanStatus = odr_malloc (assoc->encode, sizeof(*scanStatus));
1231     int *numberOfEntriesReturned =
1232          odr_malloc (assoc->encode, sizeof(*numberOfEntriesReturned));
1233     Z_ListEntries *ents = odr_malloc (assoc->encode, sizeof(*ents));
1234     oident *attent;
1235     bend_scanrequest srq;
1236     bend_scanresult *srs;
1237     oident *attset;
1238
1239     logf(LOG_LOG, "Got scanrequest");
1240     *scanStatus = Z_Scan_failure;
1241     *numberOfEntriesReturned = 0;
1242
1243     apdu->which = Z_APDU_scanResponse;
1244     apdu->u.scanResponse = res;
1245     res->referenceId = req->referenceId;
1246     res->stepSize = 0;
1247     res->scanStatus = scanStatus;
1248     res->numberOfEntriesReturned = numberOfEntriesReturned;
1249     res->positionOfTerm = 0;
1250     res->entries = ents;
1251     ents->which = Z_ListEntries_nonSurrogateDiagnostics;
1252     res->attributeSet = 0;
1253     res->otherInfo = 0;
1254
1255     if (req->attributeSet && (!(attent = oid_getentbyoid(req->attributeSet)) ||
1256         attent->oclass != CLASS_ATTSET || attent->value != VAL_BIB1))
1257         ents->u.nonSurrogateDiagnostics = diagrecs(assoc, 121, 0);
1258     else if (req->stepSize && *req->stepSize > 0)
1259         ents->u.nonSurrogateDiagnostics = diagrecs(assoc, 205, 0);
1260     else
1261     {
1262         if (req->termListAndStartPoint->term->which == Z_Term_general)
1263             logf(LOG_DEBUG, " term: '%.*s'",
1264                 req->termListAndStartPoint->term->u.general->len,
1265                 req->termListAndStartPoint->term->u.general->buf);
1266         srq.num_bases = req->num_databaseNames;
1267         srq.basenames = req->databaseNames;
1268         srq.num_entries = *req->numberOfTermsRequested;
1269         srq.term = req->termListAndStartPoint;
1270         srq.stream = assoc->encode;
1271         if (!(attset = oid_getentbyoid(req->attributeSet)) ||
1272             attset->oclass != CLASS_RECSYN)
1273             srq.attributeset = VAL_NONE;
1274         else
1275             srq.attributeset = attset->value;
1276         srq.term_position = req->preferredPositionInResponse ?
1277             *req->preferredPositionInResponse : 1;
1278         if (!(srs = bend_scan(assoc->backend, &srq, 0)))
1279             ents->u.nonSurrogateDiagnostics = diagrecs(assoc, 2, 0);
1280         else if (srs->errcode)
1281             ents->u.nonSurrogateDiagnostics = diagrecs(assoc,
1282                 srs->errcode, srs->errstring);
1283         else
1284         {
1285             int i;
1286             Z_Entries *list = odr_malloc (assoc->encode, sizeof(*list));
1287             Z_Entry **tab = odr_malloc (assoc->encode,
1288                                         sizeof(*tab) * srs->num_entries);
1289
1290             if (srs->status == BEND_SCAN_PARTIAL)
1291                 *scanStatus = Z_Scan_partial_5;
1292             else
1293                 *scanStatus = Z_Scan_success;
1294             ents->which = Z_ListEntries_entries;
1295             ents->u.entries = list;
1296             list->entries = tab;
1297             for (i = 0; i < srs->num_entries; i++)
1298             {
1299                 Z_Entry *e;
1300                 Z_TermInfo *t;
1301                 Odr_oct *o;
1302
1303                 list->entries[i] = e = odr_malloc(assoc->encode, sizeof(*e));
1304                 e->which = Z_Entry_termInfo;
1305                 e->u.termInfo = t = odr_malloc(assoc->encode, sizeof(*t));
1306                 t->suggestedAttributes = 0;
1307                 t->displayTerm = 0;
1308                 t->alternativeTerm = 0;
1309                 t->byAttributes = 0;
1310                 t->otherTermInfo = 0;
1311                 t->globalOccurrences = &srs->entries[i].occurrences;
1312                 t->term = odr_malloc(assoc->encode, sizeof(*t->term));
1313                 t->term->which = Z_Term_general;
1314                 t->term->u.general = o = odr_malloc(assoc->encode,
1315                     sizeof(Odr_oct));
1316                 o->buf = odr_malloc(assoc->encode, o->len = o->size =
1317                     strlen(srs->entries[i].term));
1318                 memcpy(o->buf, srs->entries[i].term, o->len);
1319                 logf(LOG_DEBUG, "  term #%d: '%s' (%d)", i,
1320                     srs->entries[i].term, srs->entries[i].occurrences);
1321             }
1322             list->num_entries = i;
1323             res->numberOfEntriesReturned = &list->num_entries;
1324             res->positionOfTerm = &srs->term_position;
1325         }
1326     }
1327
1328     return apdu;
1329 }
1330
1331 static void process_close(association *assoc, request *reqb)
1332 {
1333     Z_Close *req = reqb->request->u.close;
1334     static char *reasons[] =
1335     {
1336         "finished",
1337         "shutdown",
1338         "systemProblem",
1339         "costLimit",
1340         "resources",
1341         "securityViolation",
1342         "protocolError",
1343         "lackOfActivity",
1344         "peerAbort",
1345         "unspecified"
1346     };
1347
1348     logf(LOG_LOG, "Got close, reason %s, message %s",
1349         reasons[*req->closeReason], req->diagnosticInformation ?
1350         req->diagnosticInformation : "NULL");
1351     if (assoc->version < 3) /* to make do_force respond with close */
1352         assoc->version = 3;
1353     do_close(assoc, Z_Close_finished, "Association terminated by client");
1354 }