server/seshigh.c

   1 /*
   2  * Copyright (c) 1995-1999, Index Data
   3  * See the file LICENSE for details.
   4  * Sebastian Hammer, Adam Dickmeiss
   5  *
   6  * $Log: seshigh.c,v $
   7  * Revision 1.88  1999-04-20 09:56:48  adam
   8  * Added 'name' paramter to encoder/decoder routines (typedef Odr_fun).
   9  * Modified all encoders/decoders to reflect this change.
  10  *
  11  * Revision 1.87  1999/03/31 11:18:25  adam
  12  * Implemented odr_strdup. Added Reference ID to backend server API.
  13  *
  14  * Revision 1.86  1999/02/02 13:57:38  adam
  15  * Uses preprocessor define WIN32 instead of WINDOWS to build code
  16  * for Microsoft WIN32.
  17  *
  18  * Revision 1.85  1998/11/17 09:52:59  adam
  19  * Fixed minor bug (introduced by previous commit).
  20  *
  21  * Revision 1.84  1998/11/16 16:02:32  adam
  22  * Added loggin utilies, log_rpn_query and log_scan_term. These used
  23  * to be part of Zebra.
  24  *
  25  * Revision 1.83  1998/11/03 10:09:36  adam
  26  * Fixed bug regarding YC.
  27  *
  28  * Revision 1.82  1998/10/20 14:00:30  quinn
  29  * Fixed Scan
  30  *
  31  * Revision 1.81  1998/10/13 16:12:24  adam
  32  * Added support for Surrogate Diagnostics for Scan Term entries.
  33  *
  34  * Revision 1.80  1998/09/02 12:41:53  adam
  35  * Added decode stream in bend search structures.
  36  *
  37  * Revision 1.79  1998/08/19 16:10:08  adam
  38  * Changed som member names of DeleteResultSetRequest/Response.
  39  *
  40  * Revision 1.78  1998/08/03 10:23:55  adam
  41  * Fixed bug regarding Options for Sort.
  42  *
  43  * Revision 1.77  1998/07/20 12:38:42  adam
  44  * Implemented delete result set service to server API.
  45  *
  46  * Revision 1.76  1998/05/27 16:57:07  adam
  47  * Support for surrogate diagnostic records added for bend_fetch.
  48  *
  49  * Revision 1.75  1998/05/18 10:13:07  adam
  50  * Fixed call to es_request handler - extra argument was passed.
  51  *
  52  * Revision 1.74  1998/03/31 15:13:20  adam
  53  * Development towards compiled ASN.1.
  54  *
  55  * Revision 1.73  1998/03/31 11:07:45  adam
  56  * Furhter work on UNIverse resource report.
  57  * Added Extended Services handling in frontend server.
  58  *
  59  * Revision 1.72  1998/02/11 11:53:35  adam
  60  * Changed code so that it compiles as C++.
  61  *
  62  * Revision 1.71  1998/02/10 11:03:57  adam
  63  * Added support for extended handlers in backend server interface.
  64  *
  65  * Revision 1.70  1998/01/29 13:15:35  adam
  66  * Implemented sort for the backend interface.
  67  *
  68  * Revision 1.69  1997/09/30 11:48:12  adam
  69  * Fixed bug introduced by previous commit.
  70  *
  71  * Revision 1.68  1997/09/29 13:18:59  adam
  72  * Added function, oid_ent_to_oid, to replace the function
  73  * oid_getoidbyent, which is not thread safe.
  74  *
  75  * Revision 1.67  1997/09/17 12:10:40  adam
  76  * YAZ version 1.4.
  77  *
  78  * Revision 1.66  1997/09/05 15:26:44  adam
  79  * Added ODR encode in search and scen bend request structures.
  80  * Fixed a few enums that caused trouble with C++.
  81  *
  82  * Revision 1.65  1997/09/01 08:53:01  adam
  83  * New windows NT/95 port using MSV5.0. The test server 'ztest' was
  84  * moved a separate directory. MSV5.0 project server.dsp created.
  85  * As an option, the server can now operate as an NT service.
  86  *
  87  * Revision 1.64  1997/04/30 08:52:11  quinn
  88  * Null
  89  *
  90  * Revision 1.63  1996/10/11  11:57:26  quinn
  91  * Smallish
  92  *
  93  * Revision 1.62  1996/07/06  19:58:35  quinn
  94  * System headerfiles gathered in yconfig
  95  *
  96  * Revision 1.61  1996/06/10  08:56:16  quinn
  97  * Work on Summary.
  98  *
  99  * Revision 1.60  1996/05/30  11:03:10  quinn
 100  * Fixed NextresultSetPosition bug fixed.
 101  *
 102  * Revision 1.59  1996/05/14  09:26:46  quinn
 103  * Added attribute set to scan backend
 104  *
 105  * Revision 1.58  1996/02/20  12:53:04  quinn
 106  * Chanes to SCAN
 107  *
 108  * Revision 1.57  1996/01/02  08:57:47  quinn
 109  * Changed enums in the ASN.1 .h files to #defines. Changed oident.class to oclass
 110  *
 111  * Revision 1.56  1995/12/14  11:09:57  quinn
 112  * Work on Explain
 113  *
 114  * Revision 1.55  1995/11/08  17:41:37  quinn
 115  * Smallish.
 116  *
 117  * Revision 1.54  1995/11/08  15:11:29  quinn
 118  * Log of close transmit.
 119  *
 120  * Revision 1.53  1995/11/01  13:54:58  quinn
 121  * Minor adjustments
 122  *
 123  * Revision 1.52  1995/11/01  12:19:13  quinn
 124  * Second attempt to fix same bug.
 125  *
 126  * Revision 1.50  1995/10/25  16:58:32  quinn
 127  * Simple.
 128  *
 129  * Revision 1.49  1995/10/16  13:51:53  quinn
 130  * Changes to provide Especs to the backend.
 131  *
 132  * Revision 1.48  1995/10/06  08:51:20  quinn
 133  * Added Write-buffer.
 134  *
 135  * Revision 1.47  1995/08/29  14:24:16  quinn
 136  * Added second half of close-handshake
 137  *
 138  * Revision 1.46  1995/08/29  11:17:58  quinn
 139  * Added code to receive close
 140  *
 141  * Revision 1.45  1995/08/21  09:11:00  quinn
 142  * Smallish fixes to suppport new formats.
 143  *
 144  * Revision 1.44  1995/08/17  12:45:25  quinn
 145  * Fixed minor problems with GRS-1. Added support in c&s.
 146  *
 147  * Revision 1.43  1995/08/15  12:00:31  quinn
 148  * Updated External
 149  *
 150  * Revision 1.42  1995/08/15  11:16:50  quinn
 151  *
 152  * Revision 1.41  1995/08/02  10:23:06  quinn
 153  * Smallish
 154  *
 155  * Revision 1.40  1995/07/31  14:34:26  quinn
 156  * Fixed bug in process_searchResponse (numberOfRecordsReturned).
 157  *
 158  * Revision 1.39  1995/06/27  13:21:00  quinn
 159  * SUTRS support
 160  *
 161  * Revision 1.38  1995/06/19  12:39:11  quinn
 162  * Fixed bug in timeout code. Added BER dumper.
 163  *
 164  * Revision 1.37  1995/06/16  13:16:14  quinn
 165  * Fixed Defaultdiagformat.
 166  *
 167  * Revision 1.36  1995/06/16  10:31:36  quinn
 168  * Added session timeout.
 169  *
 170  * Revision 1.35  1995/06/15  07:45:14  quinn
 171  * Moving to v3.
 172  *
 173  * Revision 1.34  1995/06/14  15:26:46  quinn
 174  * *** empty log message ***
 175  *
 176  * Revision 1.33  1995/06/06  14:57:05  quinn
 177  * Better diagnostics.
 178  *
 179  * Revision 1.32  1995/06/06  08:41:44  quinn
 180  * Better diagnostics.
 181  *
 182  * Revision 1.31  1995/06/06  08:15:37  quinn
 183  * Cosmetic.
 184  *
 185  * Revision 1.30  1995/06/05  10:53:32  quinn
 186  * Added a better SCAN.
 187  *
 188  * Revision 1.29  1995/06/01  11:25:03  quinn
 189  * Smallish.
 190  *
 191  * Revision 1.28  1995/06/01  11:21:01  quinn
 192  * Attempting to fix a bug in pack-records. replaced break with continue
 193  * for large records, according to standard.
 194  *
 195  * Revision 1.27  1995/05/29  08:12:06  quinn
 196  * Moved oid to util
 197  *
 198  * Revision 1.26  1995/05/18  13:02:12  quinn
 199  * Smallish.
 200  *
 201  * Revision 1.25  1995/05/17  08:42:26  quinn
 202  * Transfer auth info to backend. Allow backend to reject init gracefully.
 203  *
 204  * Revision 1.24  1995/05/16  08:51:04  quinn
 205  * License, documentation, and memory fixes
 206  *
 207  * Revision 1.23  1995/05/15  13:25:10  quinn
 208  * Fixed memory bug.
 209  *
 210  * Revision 1.22  1995/05/15  11:56:39  quinn
 211  * Asynchronous facilities. Restructuring of seshigh code.
 212  *
 213  * Revision 1.21  1995/05/02  08:53:19  quinn
 214  * Trying in vain to fix comm with ISODE
 215  *
 216  * Revision 1.20  1995/04/20  15:13:00  quinn
 217  * Cosmetic
 218  *
 219  * Revision 1.19  1995/04/18  08:15:34  quinn
 220  * Added dynamic memory allocation on encoding (whew). Code is now somewhat
 221  * neater. We'll make the same change for decoding one day.
 222  *
 223  * Revision 1.18  1995/04/17  11:28:25  quinn
 224  * Smallish
 225  *
 226  * Revision 1.17  1995/04/10  10:23:36  quinn
 227  * Some work to add scan and other things.
 228  *
 229  * Revision 1.16  1995/03/31  09:18:55  quinn
 230  * Added logging.
 231  *
 232  * Revision 1.15  1995/03/30  14:03:23  quinn
 233  * Added RFC1006 as separate library
 234  *
 235  * Revision 1.14  1995/03/30  12:18:17  quinn
 236  * Fixed bug.
 237  *
 238  * Revision 1.13  1995/03/30  09:09:24  quinn
 239  * Added state-handle and some support for asynchronous activities.
 240  *
 241  * Revision 1.12  1995/03/29  15:40:16  quinn
 242  * Ongoing work. Statserv is now dynamic by default
 243  *
 244  * Revision 1.11  1995/03/28  09:16:21  quinn
 245  * Added record packing to the search request
 246  *
 247  * Revision 1.10  1995/03/27  08:34:24  quinn
 248  * Added dynamic server functionality.
 249  * Released bindings to session.c (is now redundant)
 250  *
 251  * Revision 1.9  1995/03/22  15:01:26  quinn
 252  * Adjusting record packing.
 253  *
 254  * Revision 1.8  1995/03/22  10:13:21  quinn
 255  * Working on record packer
 256  *
 257  * Revision 1.7  1995/03/21  15:53:31  quinn
 258  * Little changes.
 259  *
 260  * Revision 1.6  1995/03/21  12:30:09  quinn
 261  * Beginning to add support for record packing.
 262  *
 263  * Revision 1.5  1995/03/17  10:44:13  quinn
 264  * Added catch of null-string in makediagrec
 265  *
 266  * Revision 1.4  1995/03/17  10:18:08  quinn
 267  * Added memory management.
 268  *
 269  * Revision 1.3  1995/03/16  17:42:39  quinn
 270  * Little changes
 271  *
 272  * Revision 1.2  1995/03/16  13:29:01  quinn
 273  * Partitioned server.
 274  *
 275  * Revision 1.1  1995/03/15  16:02:10  quinn
 276  * Modded session.c to seshigh.c
 277  *
 278  */
 279
 280 /*
 281  * Frontend server logic.
 282  *
 283  * This code receives incoming APDUs, and handles client requests by means
 284  * of the backend API.
 285  *
 286  * Some of the code is getting quite involved, compared to simpler servers -
 287  * primarily because it is asynchronous both in the communication with
 288  * the user and the backend. We think the complexity will pay off in
 289  * the form of greater flexibility when more asynchronous facilities
 290  * are implemented.
 291  *
 292  * Memory management has become somewhat involved. In the simple case, where
 293  * only one PDU is pending at a time, it will simply reuse the same memory,
 294  * once it has found its working size. When we enable multiple concurrent
 295  * operations, perhaps even with multiple parallel calls to the backend, it
 296  * will maintain a pool of buffers for encoding and decoding, trying to
 297  * minimize memory allocation/deallocation during normal operation.
 298  *
 299  * TODOs include (and will be done in order of public interest):
 300  *
 301  * Support for EXPLAIN - provide simple meta-database system.
 302  * Support for access control.
 303  * Support for resource control.
 304  * Support for extended services - primarily Item Order.
 305  * Rest of Z39.50-1994
 306  *
 307  */
 308
 309 #include <yconfig.h>
 310 #include <stdlib.h>
 311 #include <stdio.h>
 312 #ifdef WIN32
 313 #include <process.h>
 314 #else
 315 #include <unistd.h>
 316 #endif
 317 #include <assert.h>
 318
 319 #include <xmalloc.h>
 320 #include <comstack.h>
 321 #include "eventl.h"
 322 #include "session.h"
 323 #include <proto.h>
 324 #include <oid.h>
 325 #include <log.h>
 326 #include <logrpn.h>
 327 #include <statserv.h>
 328
 329 #include <backend.h>
 330
 331 static int process_request(association *assoc, request *req);
 332 void backend_response(IOCHAN i, int event);
 333 static int process_response(association *assoc, request *req, Z_APDU *res);
 334 static Z_APDU *process_initRequest(association *assoc, request *reqb);
 335 static Z_APDU *process_searchRequest(association *assoc, request *reqb,
 336     int *fd);
 337 static Z_APDU *response_searchRequest(association *assoc, request *reqb,
 338     bend_search_rr *bsrr, int *fd);
 339 static Z_APDU *process_presentRequest(association *assoc, request *reqb,
 340     int *fd);
 341 static Z_APDU *process_scanRequest(association *assoc, request *reqb, int *fd);
 342 static Z_APDU *process_sortRequest(association *assoc, request *reqb, int *fd);
 343 static void process_close(association *assoc, request *reqb);
 344 void save_referenceId (request *reqb, Z_ReferenceId *refid);
 345 static Z_APDU *process_deleteRequest(association *assoc, request *reqb,
 346     int *fd);
 347
 348 static FILE *apduf = 0; /* for use in static mode */
 349 static statserv_options_block *control_block = 0;
 350
 351 /* Chas: Added in from DALI */
 352 static Z_APDU *process_ESRequest(association *assoc, request *reqb, int *fd);
 353 /* Chas: End of addition from DALI */
 354
 355 /*
 356  * Create and initialize a new association-handle.
 357  *  channel  : iochannel for the current line.
 358  *  link     : communications channel.
 359  * Returns: 0 or a new association handle.
 360  */
 361 association *create_association(IOCHAN channel, COMSTACK link)
 362 {
 363     association *anew;
 364
 365     if (!control_block)
 366         control_block = statserv_getcontrol();
 367     if (!(anew = (association *)xmalloc(sizeof(*anew))))
 368         return 0;
 369     anew->client_chan = channel;
 370     anew->client_link = link;
 371     if (!(anew->decode = odr_createmem(ODR_DECODE)) ||
 372         !(anew->encode = odr_createmem(ODR_ENCODE)))
 373         return 0;
 374     if (*control_block->apdufile)
 375     {
 376         char filename[256];
 377         FILE *f;
 378
 379         strcpy(filename, control_block->apdufile);
 380         if (!(anew->print = odr_createmem(ODR_PRINT)))
 381             return 0;
 382         if (*control_block->apdufile != '-')
 383         {
 384             strcpy(filename, control_block->apdufile);
 385             if (!control_block->dynamic)
 386             {
 387                 if (!apduf)
 388                 {
 389                     if (!(apduf = fopen(filename, "w")))
 390                     {
 391                         logf(LOG_WARN|LOG_ERRNO, "%s", filename);
 392                         return 0;
 393                     }
 394                     setvbuf(apduf, 0, _IONBF, 0);
 395                 }
 396                 f = apduf;
 397             }
 398             else
 399             {
 400                 sprintf(filename + strlen(filename), ".%d", getpid());
 401                 if (!(f = fopen(filename, "w")))
 402                 {
 403                     logf(LOG_WARN|LOG_ERRNO, "%s", filename);
 404                     return 0;
 405                 }
 406                 setvbuf(f, 0, _IONBF, 0);
 407             }
 408             odr_setprint(anew->print, f);
 409         }
 410     }
 411     else
 412         anew->print = 0;
 413     anew->input_buffer = 0;
 414     anew->input_buffer_len = 0;
 415     anew->backend = 0;
 416     anew->state = ASSOC_NEW;
 417     request_initq(&anew->incoming);
 418     request_initq(&anew->outgoing);
 419     anew->proto = cs_getproto(link);
 420     return anew;
 421 }
 422
 423 /*
 424  * Free association and release resources.
 425  */
 426 void destroy_association(association *h)
 427 {
 428     odr_destroy(h->decode);
 429     odr_destroy(h->encode);
 430     if (h->print)
 431         odr_destroy(h->print);
 432     if (h->input_buffer)
 433     xfree(h->input_buffer);
 434     if (h->backend)
 435         bend_close(h->backend);
 436     while (request_deq(&h->incoming));
 437     while (request_deq(&h->outgoing));
 438     request_delq(&h->incoming);
 439     request_delq(&h->outgoing);
 440     xfree(h);
 441 }
 442
 443 static void do_close_req(association *a, int reason, char *message,
 444                          request *req)
 445 {
 446     Z_APDU apdu;
 447     Z_Close *cls = zget_Close(a->encode);
 448
 449     /* Purge request queue */
 450     while (request_deq(&a->incoming));
 451     while (request_deq(&a->outgoing));
 452     if (a->version >= 3)
 453     {
 454         logf(LOG_LOG, "Sending Close PDU, reason=%d, message=%s",
 455             reason, message ? message : "none");
 456         apdu.which = Z_APDU_close;
 457         apdu.u.close = cls;
 458         *cls->closeReason = reason;
 459         cls->diagnosticInformation = message;
 460         process_response(a, req, &apdu);
 461         iochan_settimeout(a->client_chan, 60);
 462     }
 463     else
 464     {
 465         logf(LOG_DEBUG, "v2 client. No Close PDU");
 466         iochan_setevent(a->client_chan, EVENT_TIMEOUT); /* force imm close */
 467     }
 468     a->state = ASSOC_DEAD;
 469 }
 470
 471 static void do_close(association *a, int reason, char *message)
 472 {
 473     do_close_req (a, reason, message, request_get(&a->outgoing));
 474 }
 475
 476 /*
 477  * This is where PDUs from the client are read and the further
 478  * processing is initiated. Flow of control moves down through the
 479  * various process_* functions below, until the encoded result comes back up
 480  * to the output handler in here.
 481  *
 482  *  h     : the I/O channel that has an outstanding event.
 483  *  event : the current outstanding event.
 484  */
 485 void ir_session(IOCHAN h, int event)
 486 {
 487     int res;
 488     association *assoc = (association *)iochan_getdata(h);
 489     COMSTACK conn = assoc->client_link;
 490     request *req;
 491
 492     assert(h && conn && assoc);
 493     if (event == EVENT_TIMEOUT)
 494     {
 495         if (assoc->state != ASSOC_UP)
 496         {
 497             logf(LOG_LOG, "Final timeout - closing connection.");
 498             cs_close(conn);
 499             destroy_association(assoc);
 500             iochan_destroy(h);
 501         }
 502         else
 503         {
 504             logf(LOG_LOG, "Session idle too long. Sending close.");
 505             do_close(assoc, Z_Close_lackOfActivity, 0);
 506         }
 507         return;
 508     }
 509     if (event & EVENT_INPUT || event & EVENT_WORK) /* input */
 510     {
 511         if (event & EVENT_INPUT)
 512         {
 513             logf(LOG_DEBUG, "ir_session (input)");
 514             assert(assoc && conn);
 515             /* We aren't speaking to this fellow */
 516             if (assoc->state == ASSOC_DEAD)
 517             {
 518                 logf(LOG_LOG, "Closed connection after reject");
 519                 cs_close(conn);
 520                 destroy_association(assoc);
 521                 iochan_destroy(h);
 522                 return;
 523             }
 524             if ((res = cs_get(conn, &assoc->input_buffer,
 525                 &assoc->input_buffer_len)) <= 0)
 526             {
 527                 logf(LOG_LOG, "Connection closed by client");
 528                 cs_close(conn);
 529                 destroy_association(assoc);
 530                 iochan_destroy(h);
 531                 return;
 532             }
 533             else if (res == 1) /* incomplete read - wait for more  */
 534                 return;
 535             if (cs_more(conn)) /* more stuff - call us again later, please */
 536                 iochan_setevent(h, EVENT_INPUT);
 537
 538             /* we got a complete PDU. Let's decode it */
 539             logf(LOG_DEBUG, "Got PDU, %d bytes", res);
 540             req = request_get(&assoc->incoming); /* get a new request structure */
 541             odr_reset(assoc->decode);
 542             odr_setbuf(assoc->decode, assoc->input_buffer, res, 0);
 543             if (!z_APDU(assoc->decode, &req->request, 0, 0))
 544             {
 545                 logf(LOG_LOG, "ODR error on incoming PDU: %s [near byte %d] ",
 546                     odr_errmsg(odr_geterror(assoc->decode)),
 547                     odr_offset(assoc->decode));
 548                 logf(LOG_LOG, "PDU dump:");
 549                 odr_dumpBER(log_file(), assoc->input_buffer, res);
 550                 do_close(assoc, Z_Close_protocolError, "Malformed package");
 551                 return;
 552             }
 553             req->request_mem = odr_extract_mem(assoc->decode);
 554             if (assoc->print && !z_APDU(assoc->print, &req->request, 0, 0))
 555             {
 556                 logf(LOG_WARN, "ODR print error: %s",
 557                     odr_errmsg(odr_geterror(assoc->print)));
 558                 odr_reset(assoc->print);
 559             }
 560             request_enq(&assoc->incoming, req);
 561         }
 562
 563         /* can we do something yet? */
 564         req = request_head(&assoc->incoming);
 565         if (req->state == REQUEST_IDLE)
 566         {
 567             request_deq(&assoc->incoming);
 568             if (process_request(assoc, req) < 0)
 569                 do_close_req(assoc, Z_Close_systemProblem, "Unknown error",
 570                              req);
 571         }
 572     }
 573     if (event & EVENT_OUTPUT)
 574     {
 575         request *req = request_head(&assoc->outgoing);
 576
 577         logf(LOG_DEBUG, "ir_session (output)");
 578         req->state = REQUEST_PENDING;
 579         switch (res = cs_put(conn, req->response, req->len_response))
 580         {
 581             case -1:
 582                 logf(LOG_LOG, "Connection closed by client");
 583                 cs_close(conn);
 584                 destroy_association(assoc);
 585                 iochan_destroy(h);
 586                 break;
 587             case 0: /* all sent - release the request structure */
 588                 logf(LOG_DEBUG, "Wrote PDU, %d bytes", req->len_response);
 589                 nmem_destroy(req->request_mem);
 590                 request_deq(&assoc->outgoing);
 591                 request_release(req);
 592                 if (!request_head(&assoc->outgoing))
 593                     iochan_clearflag(h, EVENT_OUTPUT);
 594                 break;
 595             /* value of 1 -- partial send -- is simply ignored */
 596         }
 597     }
 598     if (event & EVENT_EXCEPT)
 599     {
 600         logf(LOG_DEBUG, "ir_session (exception)");
 601         cs_close(conn);
 602         destroy_association(assoc);
 603         iochan_destroy(h);
 604     }
 605 }
 606
 607 /*
 608  * Initiate request processing.
 609  */
 610 static int process_request(association *assoc, request *req)
 611 {
 612     int fd = -1;
 613     Z_APDU *res;
 614     int retval;
 615
 616     assert(req && req->state == REQUEST_IDLE);
 617     switch (req->request->which)
 618     {
 619         case Z_APDU_initRequest:
 620             res = process_initRequest(assoc, req); break;
 621         case Z_APDU_searchRequest:
 622             res = process_searchRequest(assoc, req, &fd); break;
 623         case Z_APDU_presentRequest:
 624             res = process_presentRequest(assoc, req, &fd); break;
 625         case Z_APDU_scanRequest:
 626             res = process_scanRequest(assoc, req, &fd); break;
 627         case Z_APDU_extendedServicesRequest:
 628             if (assoc->bend_esrequest)
 629                 res = process_ESRequest(assoc, req, &fd);
 630             else
 631             {
 632                 logf(LOG_WARN, "Cannot handle EXTENDED SERVICES APDU");
 633                 return -1;
 634             }
 635             break;
 636         case Z_APDU_sortRequest:
 637             if (assoc->bend_sort)
 638                 res = process_sortRequest(assoc, req, &fd);
 639             else
 640             {
 641                 logf(LOG_WARN, "Cannot handle SORT APDU");
 642                 return -1;
 643             }
 644             break;
 645         case Z_APDU_close:
 646             process_close(assoc, req); return 0;
 647         case Z_APDU_deleteResultSetRequest:
 648             if (assoc->bend_delete)
 649                 res = process_deleteRequest(assoc, req, &fd);
 650             else
 651             {
 652                 logf (LOG_WARN, "Cannot handle Delete APDU");
 653                 return -1;
 654             }
 655             break;
 656         default:
 657             logf(LOG_WARN, "Bad APDU received");
 658             return -1;
 659     }
 660     if (res)
 661     {
 662         logf(LOG_DEBUG, "  result immediately available");
 663         retval = process_response(assoc, req, res);
 664     }
 665     else if (fd < 0)
 666     {
 667         logf(LOG_DEBUG, "  result unavailble");
 668         retval = 0;
 669     }
 670     else /* no result yet - one will be provided later */
 671     {
 672         IOCHAN chan;
 673
 674         /* Set up an I/O handler for the fd supplied by the backend */
 675
 676         logf(LOG_DEBUG, "   establishing handler for result");
 677         req->state = REQUEST_PENDING;
 678         if (!(chan = iochan_create(fd, backend_response, EVENT_INPUT)))
 679             abort();
 680         iochan_setdata(chan, assoc);
 681         retval = 0;
 682     }
 683     return retval;
 684 }
 685
 686 /*
 687  * Handle message from the backend.
 688  */
 689 void backend_response(IOCHAN i, int event)
 690 {
 691     association *assoc = (association *)iochan_getdata(i);
 692     request *req = request_head(&assoc->incoming);
 693     Z_APDU *res;
 694     int fd;
 695
 696     logf(LOG_DEBUG, "backend_response");
 697     assert(assoc && req && req->state != REQUEST_IDLE);
 698     /* determine what it is we're waiting for */
 699     switch (req->request->which)
 700     {
 701         case Z_APDU_searchRequest:
 702             res = response_searchRequest(assoc, req, 0, &fd); break;
 703 #if 0
 704         case Z_APDU_presentRequest:
 705             res = response_presentRequest(assoc, req, 0, &fd); break;
 706         case Z_APDU_scanRequest:
 707             res = response_scanRequest(assoc, req, 0, &fd); break;
 708 #endif
 709         default:
 710             logf(LOG_WARN, "Serious programmer's lapse or bug");
 711             abort();
 712     }
 713     if ((res && process_response(assoc, req, res) < 0) || fd < 0)
 714     {
 715         logf(LOG_LOG, "Fatal error when talking to backend");
 716         do_close(assoc, Z_Close_systemProblem, 0);
 717         iochan_destroy(i);
 718         return;
 719     }
 720     else if (!res) /* no result yet - try again later */
 721     {
 722         logf(LOG_DEBUG, "   no result yet");
 723         iochan_setfd(i, fd); /* in case fd has changed */
 724     }
 725 }
 726
 727 /*
 728  * Encode response, and transfer the request structure to the outgoing queue.
 729  */
 730 static int process_response(association *assoc, request *req, Z_APDU *res)
 731 {
 732     odr_setbuf(assoc->encode, req->response, req->size_response, 1);
 733     if (!z_APDU(assoc->encode, &res, 0, 0))
 734     {
 735         logf(LOG_WARN, "ODR error when encoding response: %s",
 736             odr_errmsg(odr_geterror(assoc->decode)));
 737         odr_reset(assoc->encode);
 738         return -1;
 739     }
 740     req->response = odr_getbuf(assoc->encode, &req->len_response,
 741         &req->size_response);
 742     odr_setbuf(assoc->encode, 0, 0, 0); /* don'txfree if we abort later */
 743     if (assoc->print && !z_APDU(assoc->print, &res, 0, 0))
 744     {
 745         logf(LOG_WARN, "ODR print error: %s",
 746             odr_errmsg(odr_geterror(assoc->print)));
 747         odr_reset(assoc->print);
 748     }
 749     odr_reset(assoc->encode);
 750     req->state = REQUEST_IDLE;
 751     request_enq(&assoc->outgoing, req);
 752     /* turn the work over to the ir_session handler */
 753     iochan_setflag(assoc->client_chan, EVENT_OUTPUT);
 754     /* Is there more work to be done? give that to the input handler too */
 755 #if 1
 756     if (request_head(&assoc->incoming))
 757     {
 758         logf (LOG_DEBUG, "more work to be done");
 759         iochan_setevent(assoc->client_chan, EVENT_WORK);
 760     }
 761 #endif
 762     return 0;
 763 }
 764
 765 /*
 766  * Handle init request.
 767  * At the moment, we don't check the options
 768  * anywhere else in the code - we just try not to do anything that would
 769  * break a naive client. We'll toss 'em into the association block when
 770  * we need them there.
 771  */
 772 static Z_APDU *process_initRequest(association *assoc, request *reqb)
 773 {
 774     Z_InitRequest *req = reqb->request->u.initRequest;
 775     Z_APDU *apdu = zget_APDU(assoc->encode, Z_APDU_initResponse);
 776     Z_InitResponse *resp = apdu->u.initResponse;
 777     bend_initrequest binitreq;
 778     bend_initresult *binitres;
 779     char options[100];
 780
 781     logf(LOG_LOG, "Got initRequest");
 782     if (req->implementationId)
 783         logf(LOG_LOG, "Id:        %s", req->implementationId);
 784     if (req->implementationName)
 785         logf(LOG_LOG, "Name:      %s", req->implementationName);
 786     if (req->implementationVersion)
 787         logf(LOG_LOG, "Version:   %s", req->implementationVersion);
 788
 789     binitreq.stream = assoc->encode;
 790     binitreq.configname = "default-config";
 791     binitreq.auth = req->idAuthentication;
 792     binitreq.referenceId = req->referenceId;
 793     binitreq.bend_sort = NULL;
 794     binitreq.bend_search = NULL;
 795     binitreq.bend_present = NULL;
 796     binitreq.bend_esrequest = NULL;
 797     binitreq.bend_delete = NULL;
 798     if (!(binitres = bend_init(&binitreq)))
 799     {
 800         logf(LOG_WARN, "Bad response from backend.");
 801         return 0;
 802     }
 803
 804     assoc->backend = binitres->handle;
 805     if ((assoc->bend_sort = (int (*)())binitreq.bend_sort))
 806         logf (LOG_DEBUG, "Sort handler installed");
 807     if ((assoc->bend_search = (int (*)())binitreq.bend_search))
 808         logf (LOG_DEBUG, "Search handler installed");
 809     if ((assoc->bend_present = (int (*)())binitreq.bend_present))
 810         logf (LOG_DEBUG, "Present handler installed");
 811     if ((assoc->bend_esrequest = (int (*)())binitreq.bend_esrequest))
 812         logf (LOG_DEBUG, "ESRequest handler installed");
 813     if ((assoc->bend_delete = (int (*)())binitreq.bend_delete))
 814         logf (LOG_DEBUG, "Delete handler installed");
 815
 816     resp->referenceId = req->referenceId;
 817     *options = '\0';
 818     /* let's tell the client what we can do */
 819     if (ODR_MASK_GET(req->options, Z_Options_search))
 820     {
 821         ODR_MASK_SET(resp->options, Z_Options_search);
 822         strcat(options, "srch");
 823     }
 824     if (ODR_MASK_GET(req->options, Z_Options_present))
 825     {
 826         ODR_MASK_SET(resp->options, Z_Options_present);
 827         strcat(options, " prst");
 828     }
 829     if (ODR_MASK_GET(req->options, Z_Options_delSet) && binitreq.bend_delete)
 830     {
 831         ODR_MASK_SET(resp->options, Z_Options_delSet);
 832         strcat(options, " del");
 833     }
 834     if (ODR_MASK_GET(req->options, Z_Options_extendedServices) &&
 835         binitreq.bend_esrequest)
 836     {
 837         ODR_MASK_SET(resp->options, Z_Options_extendedServices);
 838         strcat (options, " extendedServices");
 839     }
 840     if (ODR_MASK_GET(req->options, Z_Options_namedResultSets))
 841     {
 842         ODR_MASK_SET(resp->options, Z_Options_namedResultSets);
 843         strcat(options, " namedresults");
 844     }
 845     if (ODR_MASK_GET(req->options, Z_Options_scan))
 846     {
 847         ODR_MASK_SET(resp->options, Z_Options_scan);
 848         strcat(options, " scan");
 849     }
 850     if (ODR_MASK_GET(req->options, Z_Options_concurrentOperations))
 851     {
 852         ODR_MASK_SET(resp->options, Z_Options_concurrentOperations);
 853         strcat(options, " concurop");
 854     }
 855     if (ODR_MASK_GET(req->options, Z_Options_sort) && binitreq.bend_sort)
 856     {
 857         ODR_MASK_SET(resp->options, Z_Options_sort);
 858         strcat(options, " sort");
 859     }
 860     if (ODR_MASK_GET(req->protocolVersion, Z_ProtocolVersion_1))
 861     {
 862         ODR_MASK_SET(resp->protocolVersion, Z_ProtocolVersion_1);
 863         assoc->version = 2; /* 1 & 2 are equivalent */
 864     }
 865     if (ODR_MASK_GET(req->protocolVersion, Z_ProtocolVersion_2))
 866     {
 867         ODR_MASK_SET(resp->protocolVersion, Z_ProtocolVersion_2);
 868         assoc->version = 2;
 869     }
 870     if (ODR_MASK_GET(req->protocolVersion, Z_ProtocolVersion_3))
 871     {
 872         ODR_MASK_SET(resp->protocolVersion, Z_ProtocolVersion_3);
 873         assoc->version = 3;
 874     }
 875     logf(LOG_LOG, "Negotiated to v%d: %s", assoc->version, options);
 876     assoc->maximumRecordSize = *req->maximumRecordSize;
 877     if (assoc->maximumRecordSize > control_block->maxrecordsize)
 878         assoc->maximumRecordSize = control_block->maxrecordsize;
 879     assoc->preferredMessageSize = *req->preferredMessageSize;
 880     if (assoc->preferredMessageSize > assoc->maximumRecordSize)
 881         assoc->preferredMessageSize = assoc->maximumRecordSize;
 882     resp->preferredMessageSize = &assoc->preferredMessageSize;
 883     resp->maximumRecordSize = &assoc->maximumRecordSize;
 884     resp->implementationName = "Index Data/YAZ Generic Frontend Server";
 885     if (binitres->errcode)
 886     {
 887         logf(LOG_LOG, "Connection rejected by backend.");
 888         *resp->result = 0;
 889         assoc->state = ASSOC_DEAD;
 890     }
 891     else
 892         assoc->state = ASSOC_UP;
 893     return apdu;
 894 }
 895
 896 /*
 897  * These functions should be merged.
 898  */
 899
 900 static void set_addinfo (Z_DefaultDiagFormat *dr, char *addinfo)
 901 {
 902 #if ASN_COMPILED
 903     dr->which = Z_DefaultDiagFormat_v2Addinfo;
 904     dr->u.v2Addinfo = addinfo ? addinfo : "";
 905 #else
 906     dr->which = Z_DiagForm_v2AddInfo;
 907     dr->addinfo = addinfo ? addinfo : "";
 908 #endif
 909 }
 910
 911 /*
 912  * nonsurrogate diagnostic record.
 913  */
 914 static Z_Records *diagrec(association *assoc, int error, char *addinfo)
 915 {
 916     int oid[OID_SIZE];
 917     Z_Records *rec = (Z_Records *)
 918         odr_malloc (assoc->encode, sizeof(*rec));
 919     oident bib1;
 920     int *err = (int *)
 921         odr_malloc (assoc->encode, sizeof(*err));
 922     Z_DiagRec *drec = (Z_DiagRec *)
 923         odr_malloc (assoc->encode, sizeof(*drec));
 924     Z_DefaultDiagFormat *dr = (Z_DefaultDiagFormat *)
 925         odr_malloc (assoc->encode, sizeof(*dr));
 926
 927     bib1.proto = assoc->proto;
 928     bib1.oclass = CLASS_DIAGSET;
 929     bib1.value = VAL_BIB1;
 930
 931     logf(LOG_DEBUG, "Diagnostic: %d -- %s", error, addinfo ? addinfo :
 932         "NULL");
 933     *err = error;
 934     rec->which = Z_Records_NSD;
 935 #if ASN_COMPILED
 936     rec->u.nonSurrogateDiagnostic = dr;
 937 #else
 938     rec->u.nonSurrogateDiagnostic = drec;
 939     drec->which = Z_DiagRec_defaultFormat;
 940     drec->u.defaultFormat = dr;
 941 #endif
 942     dr->diagnosticSetId =
 943         odr_oiddup (assoc->encode, oid_ent_to_oid(&bib1, oid));
 944     dr->condition = err;
 945     set_addinfo (dr, addinfo);
 946     return rec;
 947 }
 948
 949 /*
 950  * surrogate diagnostic.
 951  */
 952 static Z_NamePlusRecord *surrogatediagrec(association *assoc, char *dbname,
 953                                           int error, char *addinfo)
 954 {
 955     int oid[OID_SIZE];
 956     Z_NamePlusRecord *rec = (Z_NamePlusRecord *)
 957         odr_malloc (assoc->encode, sizeof(*rec));
 958     int *err = (int *)odr_malloc (assoc->encode, sizeof(*err));
 959     oident bib1;
 960     Z_DiagRec *drec = (Z_DiagRec *)odr_malloc (assoc->encode, sizeof(*drec));
 961     Z_DefaultDiagFormat *dr = (Z_DefaultDiagFormat *)
 962         odr_malloc (assoc->encode, sizeof(*dr));
 963
 964     bib1.proto = assoc->proto;
 965     bib1.oclass = CLASS_DIAGSET;
 966     bib1.value = VAL_BIB1;
 967
 968     logf(LOG_DEBUG, "SurrogateDiagnotic: %d -- %s", error, addinfo);
 969     *err = error;
 970     rec->databaseName = dbname;
 971     rec->which = Z_NamePlusRecord_surrogateDiagnostic;
 972     rec->u.surrogateDiagnostic = drec;
 973     drec->which = Z_DiagRec_defaultFormat;
 974     drec->u.defaultFormat = dr;
 975     dr->diagnosticSetId = odr_oiddup (assoc->encode,
 976                                       oid_ent_to_oid(&bib1, oid));
 977     dr->condition = err;
 978     set_addinfo (dr, addinfo);
 979
 980     return rec;
 981 }
 982
 983 /*
 984  * multiple nonsurrogate diagnostics.
 985  */
 986 static Z_DiagRecs *diagrecs(association *assoc, int error, char *addinfo)
 987 {
 988     int oid[OID_SIZE];
 989     Z_DiagRecs *recs = (Z_DiagRecs *)odr_malloc (assoc->encode, sizeof(*recs));
 990     int *err = (int *)odr_malloc (assoc->encode, sizeof(*err));
 991     oident bib1;
 992     Z_DiagRec **recp = (Z_DiagRec **)odr_malloc (assoc->encode, sizeof(*recp));
 993     Z_DiagRec *drec = (Z_DiagRec *)odr_malloc (assoc->encode, sizeof(*drec));
 994     Z_DefaultDiagFormat *rec = (Z_DefaultDiagFormat *)odr_malloc (assoc->encode, sizeof(*rec));
 995
 996     logf(LOG_DEBUG, "DiagRecs: %d -- %s", error, addinfo ? addinfo : "");
 997     bib1.proto = assoc->proto;
 998     bib1.oclass = CLASS_DIAGSET;
 999     bib1.value = VAL_BIB1;
1000
1001     *err = error;
1002     recs->num_diagRecs = 1;
1003     recs->diagRecs = recp;
1004     recp[0] = drec;
1005     drec->which = Z_DiagRec_defaultFormat;
1006     drec->u.defaultFormat = rec;
1007
1008     rec->diagnosticSetId = odr_oiddup (assoc->encode,
1009                                       oid_ent_to_oid(&bib1, oid));
1010     rec->condition = err;
1011
1012 #ifdef ASN_COMPILED
1013     rec->which = Z_DefaultDiagFormat_v2Addinfo;
1014     rec->u.v2Addinfo = addinfo ? addinfo : "";
1015 #else
1016     rec->which = Z_DiagForm_v2AddInfo;
1017     rec->addinfo = addinfo ? addinfo : "";
1018 #endif
1019     return recs;
1020 }
1021
1022 static Z_Records *pack_records(association *a, char *setname, int start,
1023                                 int *num, Z_RecordComposition *comp,
1024                                 int *next, int *pres, oid_value format,
1025                                 Z_ReferenceId *referenceId)
1026 {
1027     int oid[OID_SIZE];
1028     int recno, total_length = 0, toget = *num, dumped_records = 0;
1029     Z_Records *records =
1030         (Z_Records *) odr_malloc (a->encode, sizeof(*records));
1031     Z_NamePlusRecordList *reclist =
1032         (Z_NamePlusRecordList *) odr_malloc (a->encode, sizeof(*reclist));
1033     Z_NamePlusRecord **list =
1034         (Z_NamePlusRecord **) odr_malloc (a->encode, sizeof(*list) * toget);
1035     oident recform;
1036
1037     records->which = Z_Records_DBOSD;
1038     records->u.databaseOrSurDiagnostics = reclist;
1039     reclist->num_records = 0;
1040     reclist->records = list;
1041     *pres = Z_PRES_SUCCESS;
1042     *num = 0;
1043     *next = 0;
1044
1045     logf(LOG_LOG, "Request to pack %d+%d", start, toget);
1046     logf(LOG_DEBUG, "pms=%d, mrs=%d", a->preferredMessageSize,
1047         a->maximumRecordSize);
1048     for (recno = start; reclist->num_records < toget; recno++)
1049     {
1050         bend_fetchrequest freq;
1051         bend_fetchresult *fres;
1052         Z_NamePlusRecord *thisrec;
1053         Z_DatabaseRecord *thisext;
1054         int this_length = 0;
1055
1056         /*
1057          * we get the number of bytes allocated on the stream before any
1058          * allocation done by the backend - this should give us a reasonable
1059          * idea of the total size of the data so far.
1060          */
1061         total_length = odr_total(a->encode) - dumped_records;
1062         freq.setname = setname;
1063         freq.number = recno;
1064         freq.comp = comp;
1065         freq.format = format;
1066         freq.stream = a->encode;
1067         freq.surrogate_flag = 0;
1068         freq.referenceId = referenceId;
1069         if (!(fres = bend_fetch(a->backend, &freq, 0)))
1070         {
1071             *pres = Z_PRES_FAILURE;
1072             return diagrec(a, 2, "Backend interface problem");
1073         }
1074         /* backend should be able to signal whether error is system-wide
1075            or only pertaining to current record */
1076         if (fres->errcode)
1077         {
1078             if (!freq.surrogate_flag)
1079             {
1080                 *pres = Z_PRES_FAILURE;
1081                 return diagrec(a, fres->errcode, fres->errstring);
1082             }
1083             reclist->records[reclist->num_records] =
1084                 surrogatediagrec(a, fres->basename, fres->errcode,
1085                                  fres->errstring);
1086             reclist->num_records++;
1087             *next = fres->last_in_set ? 0 : recno + 1;
1088             continue;
1089         }
1090         if (fres->len >= 0)
1091             this_length = fres->len;
1092         else
1093             this_length = odr_total(a->encode) - total_length;
1094         logf(LOG_DEBUG, "  fetched record, len=%d, total=%d",
1095             this_length, total_length);
1096         if (this_length + total_length > a->preferredMessageSize)
1097         {
1098             /* record is small enough, really */
1099             if (this_length <= a->preferredMessageSize)
1100             {
1101                 logf(LOG_DEBUG, "  Dropped last normal-sized record");
1102                 *pres = Z_PRES_PARTIAL_2;
1103                 break;
1104             }
1105             /* record can only be fetched by itself */
1106             if (this_length < a->maximumRecordSize)
1107             {
1108                 logf(LOG_DEBUG, "  Record > prefmsgsz");
1109                 if (toget > 1)
1110                 {
1111                     logf(LOG_DEBUG, "  Dropped it");
1112                     reclist->records[reclist->num_records] =
1113                          surrogatediagrec(a, fres->basename, 16, 0);
1114                     reclist->num_records++;
1115                     *next = fres->last_in_set ? 0 : recno + 1;
1116                     dumped_records += this_length;
1117                     continue;
1118                 }
1119             }
1120             else /* too big entirely */
1121             {
1122                 logf(LOG_DEBUG, "Record > maxrcdsz");
1123                 reclist->records[reclist->num_records] =
1124                     surrogatediagrec(a, fres->basename, 17, 0);
1125                 reclist->num_records++;
1126                 *next = fres->last_in_set ? 0 : recno + 1;
1127                 dumped_records += this_length;
1128                 continue;
1129             }
1130         }
1131
1132         if (!(thisrec = (Z_NamePlusRecord *)
1133               odr_malloc(a->encode, sizeof(*thisrec))))
1134             return 0;
1135         if (!(thisrec->databaseName = (char *)odr_malloc(a->encode,
1136             strlen(fres->basename) + 1)))
1137             return 0;
1138         strcpy(thisrec->databaseName, fres->basename);
1139         thisrec->which = Z_NamePlusRecord_databaseRecord;
1140         if (!(thisrec->u.databaseRecord = thisext = (Z_External *)
1141               odr_malloc(a->encode, sizeof(Z_DatabaseRecord))))
1142             return 0;
1143         recform.proto = a->proto;
1144         recform.oclass = CLASS_RECSYN;
1145         recform.value = fres->format;
1146         thisext->direct_reference =
1147             odr_oiddup(a->encode, oid_ent_to_oid(&recform, oid));
1148         thisext->indirect_reference = 0;
1149         thisext->descriptor = 0;
1150         if (fres->len < 0) /* Structured data */
1151         {
1152             switch (fres->format)
1153             {
1154                 case VAL_SUTRS: thisext->which = Z_External_sutrs; break;
1155                 case VAL_GRS1: thisext->which = Z_External_grs1; break;
1156                 case VAL_EXPLAIN: thisext->which = Z_External_explainRecord;
1157                     break;
1158                 case VAL_SUMMARY: thisext->which = Z_External_summary; break;
1159                 case VAL_OPAC: thisext->which = Z_External_OPAC; break;
1160
1161                 default:
1162                     logf(LOG_FATAL, "Unknown structured format from backend.");
1163                     return 0;
1164             }
1165
1166             /*
1167              * We cheat on the pointers here. Obviously, the record field
1168              * of the backend-fetch structure should have been a union for
1169              * correctness, but we're stuck with this for backwards
1170              * compatibility.
1171              */
1172             thisext->u.grs1 = (Z_GenericRecord*) fres->record;
1173         }
1174         else if (fres->format == VAL_SUTRS) /* SUTRS is a single-ASN.1-type */
1175         {
1176 #if 0
1177             Z_SUTRS *sutrs = (Z_SUTRS *)odr_malloc(a->encode, 1+fres->len);
1178
1179             memcpy(sutrs, fres->record, fres->len);
1180             sutrs[fres->len] = '\0';
1181 #else
1182             Odr_oct *sutrs = (Odr_oct *)odr_malloc(a->encode, sizeof(*sutrs));
1183
1184             thisext->which = Z_External_sutrs;
1185             thisext->u.sutrs = sutrs;
1186             sutrs->buf = (unsigned char *)odr_malloc(a->encode, fres->len);
1187             sutrs->len = sutrs->size = fres->len;
1188             memcpy(sutrs->buf, fres->record, fres->len);
1189 #endif
1190         }
1191         else /* octet-aligned record. */
1192         {
1193             thisext->which = Z_External_octet;
1194             if (!(thisext->u.octet_aligned = (Odr_oct *)odr_malloc(a->encode,
1195                 sizeof(Odr_oct))))
1196                 return 0;
1197             if (!(thisext->u.octet_aligned->buf = (unsigned char *)
1198                   odr_malloc(a->encode, fres->len)))
1199                 return 0;
1200             memcpy(thisext->u.octet_aligned->buf, fres->record, fres->len);
1201             thisext->u.octet_aligned->len = thisext->u.octet_aligned->size =
1202                 fres->len;
1203         }
1204         reclist->records[reclist->num_records] = thisrec;
1205         reclist->num_records++;
1206         *next = fres->last_in_set ? 0 : recno + 1;
1207     }
1208     *num = reclist->num_records;
1209     return records;
1210 }
1211
1212 static Z_APDU *process_searchRequest(association *assoc, request *reqb,
1213     int *fd)
1214 {
1215     Z_SearchRequest *req = reqb->request->u.searchRequest;
1216     bend_search_rr *bsrr =
1217         (bend_search_rr *)nmem_malloc (reqb->request_mem, sizeof(*bsrr));
1218
1219     logf(LOG_LOG, "Got SearchRequest.");
1220     bsrr->fd = fd;
1221     bsrr->request = reqb;
1222     bsrr->association = assoc;
1223     bsrr->referenceId = req->referenceId;
1224     save_referenceId (reqb, bsrr->referenceId);
1225
1226     logf (LOG_LOG, "ResultSet '%s'", req->resultSetName);
1227     if (req->databaseNames)
1228     {
1229         int i;
1230         for (i = 0; i < req->num_databaseNames; i++)
1231             logf (LOG_LOG, "Database '%s'", req->databaseNames[i]);
1232     }
1233     switch (req->query->which)
1234     {
1235     case Z_Query_type_1: case Z_Query_type_101:
1236         log_rpn_query (req->query->u.type_1);
1237     }
1238     if (assoc->bend_search)
1239     {
1240         bsrr->setname = req->resultSetName;
1241         bsrr->replace_set = *req->replaceIndicator;
1242         bsrr->num_bases = req->num_databaseNames;
1243         bsrr->basenames = req->databaseNames;
1244         bsrr->query = req->query;
1245         bsrr->stream = assoc->encode;
1246         bsrr->decode = assoc->decode;
1247         bsrr->errcode = 0;
1248         bsrr->hits = 0;
1249         bsrr->errstring = NULL;
1250         ((int (*)(void *, bend_search_rr *))(assoc->bend_search))
1251             (assoc->backend, bsrr);
1252         if (!bsrr->request)
1253             return 0;
1254     }
1255     else
1256     {
1257         bend_searchrequest bsrq;
1258         bend_searchresult *bsrt;
1259
1260         bsrq.setname = req->resultSetName;
1261         bsrq.replace_set = *req->replaceIndicator;
1262         bsrq.num_bases = req->num_databaseNames;
1263         bsrq.basenames = req->databaseNames;
1264         bsrq.query = req->query;
1265         bsrq.referenceId = req->referenceId;
1266         bsrq.stream = assoc->encode;
1267         bsrq.decode = assoc->decode;
1268         if (!(bsrt = bend_search (assoc->backend, &bsrq, fd)))
1269             return 0;
1270         bsrr->hits = bsrt->hits;
1271         bsrr->errcode = bsrt->errcode;
1272         bsrr->errstring = bsrt->errstring;
1273     }
1274     return response_searchRequest(assoc, reqb, bsrr, fd);
1275 }
1276
1277 int bend_searchresponse(void *handle, bend_search_rr *bsrr) {return 0;}
1278
1279 /*
1280  * Prepare a searchresponse based on the backend results. We probably want
1281  * to look at making the fetching of records nonblocking as well, but
1282  * so far, we'll keep things simple.
1283  * If bsrt is null, that means we're called in response to a communications
1284  * event, and we'll have to get the response for ourselves.
1285  */
1286 static Z_APDU *response_searchRequest(association *assoc, request *reqb,
1287     bend_search_rr *bsrt, int *fd)
1288 {
1289     Z_SearchRequest *req = reqb->request->u.searchRequest;
1290     Z_APDU *apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1291     Z_SearchResponse *resp = (Z_SearchResponse *)
1292         odr_malloc (assoc->encode, sizeof(*resp));
1293     int *nulint = (int *)odr_malloc (assoc->encode, sizeof(*nulint));
1294     bool_t *sr = (bool_t *)odr_malloc (assoc->encode, sizeof(*sr));
1295     int *next = (int *)odr_malloc (assoc->encode, sizeof(*next));
1296     int *none = (int *)odr_malloc (assoc->encode, sizeof(*none));
1297
1298     *nulint = 0;
1299     *sr = 1;
1300     *next = 0;
1301     *none = Z_RES_NONE;
1302
1303     apdu->which = Z_APDU_searchResponse;
1304     apdu->u.searchResponse = resp;
1305     resp->referenceId = req->referenceId;
1306     resp->additionalSearchInfo = 0;
1307     resp->otherInfo = 0;
1308     *fd = -1;
1309     if (!bsrt && !bend_searchresponse(assoc->backend, bsrt))
1310     {
1311         logf(LOG_FATAL, "Bad result from backend");
1312         return 0;
1313     }
1314     else if (bsrt->errcode)
1315     {
1316         resp->records = diagrec(assoc, bsrt->errcode, bsrt->errstring);
1317         resp->resultCount = nulint;
1318         resp->numberOfRecordsReturned = nulint;
1319         resp->nextResultSetPosition = nulint;
1320         resp->searchStatus = nulint;
1321         resp->resultSetStatus = none;
1322         resp->presentStatus = 0;
1323     }
1324     else
1325     {
1326         int *toget = (int *)odr_malloc (assoc->encode, sizeof(*toget));
1327         int *presst = (int *)odr_malloc (assoc->encode, sizeof(*presst));
1328         Z_RecordComposition comp, *compp = 0;
1329
1330         *toget = 0;
1331         *presst = 0;
1332         resp->records = 0;
1333         resp->resultCount = &bsrt->hits;
1334
1335         comp.which = Z_RecordComp_simple;
1336         /* how many records does the user agent want, then? */
1337         if (bsrt->hits <= *req->smallSetUpperBound)
1338         {
1339             *toget = bsrt->hits;
1340             if ((comp.u.simple = req->smallSetElementSetNames))
1341                 compp = &comp;
1342         }
1343         else if (bsrt->hits < *req->largeSetLowerBound)
1344         {
1345             *toget = *req->mediumSetPresentNumber;
1346             if (*toget > bsrt->hits)
1347                 *toget = bsrt->hits;
1348             if ((comp.u.simple = req->mediumSetElementSetNames))
1349                 compp = &comp;
1350         }
1351         else
1352             *toget = 0;
1353
1354         if (*toget && !resp->records)
1355         {
1356             oident *prefformat;
1357             oid_value form;
1358
1359             if (!(prefformat = oid_getentbyoid(req->preferredRecordSyntax)) ||
1360                 prefformat->oclass != CLASS_RECSYN)
1361                 form = VAL_NONE;
1362             else
1363                 form = prefformat->value;
1364             resp->records = pack_records(assoc, req->resultSetName, 1,
1365                 toget, compp, next, presst, form, req->referenceId);
1366             if (!resp->records)
1367                 return 0;
1368             resp->numberOfRecordsReturned = toget;
1369             resp->nextResultSetPosition = next;
1370             resp->searchStatus = sr;
1371             resp->resultSetStatus = 0;
1372             resp->presentStatus = presst;
1373         }
1374         else
1375         {
1376             if (*resp->resultCount)
1377                 *next = 1;
1378             resp->numberOfRecordsReturned = nulint;
1379             resp->nextResultSetPosition = next;
1380             resp->searchStatus = sr;
1381             resp->resultSetStatus = 0;
1382             resp->presentStatus = 0;
1383         }
1384     }
1385     return apdu;
1386 }
1387
1388 /*
1389  * Maybe we got a little over-friendly when we designed bend_fetch to
1390  * get only one record at a time. Some backends can optimise multiple-record
1391  * fetches, and at any rate, there is some overhead involved in
1392  * all that selecting and hopping around. Problem is, of course, that the
1393  * frontend can't know ahead of time how many records it'll need to
1394  * fill the negotiated PDU size. Annoying. Segmentation or not, Z/SR
1395  * is downright lousy as a bulk data transfer protocol.
1396  *
1397  * To start with, we'll do the fetching of records from the backend
1398  * in one operation: To save some trips in and out of the event-handler,
1399  * and to simplify the interface to pack_records. At any rate, asynch
1400  * operation is more fun in operations that have an unpredictable execution
1401  * speed - which is normally more true for search than for present.
1402  */
1403 static Z_APDU *process_presentRequest(association *assoc, request *reqb,
1404     int *fd)
1405 {
1406     Z_PresentRequest *req = reqb->request->u.presentRequest;
1407     oident *prefformat;
1408     oid_value form;
1409     Z_APDU *apdu;
1410     Z_PresentResponse *resp;
1411     int *presst;
1412     int *next;
1413     int *num;
1414
1415     logf(LOG_LOG, "Got PresentRequest.");
1416
1417     if (!(prefformat = oid_getentbyoid(req->preferredRecordSyntax)) ||
1418         prefformat->oclass != CLASS_RECSYN)
1419         form = VAL_NONE;
1420     else
1421         form = prefformat->value;
1422     if (assoc->bend_present)
1423     {
1424         bend_present_rr *bprr = (bend_present_rr *)
1425             nmem_malloc (reqb->request_mem, sizeof(*bprr));
1426         bprr->setname = req->resultSetId;
1427         bprr->start = *req->resultSetStartPoint;
1428         bprr->number = *req->numberOfRecordsRequested;
1429         bprr->format = form;
1430         bprr->comp = req->recordComposition;
1431         bprr->referenceId = req->referenceId;
1432         bprr->stream = assoc->encode;
1433         bprr->request = reqb;
1434         bprr->association = assoc;
1435         bprr->errcode = 0;
1436         bprr->errstring = NULL;
1437         ((int (*)(void *, bend_present_rr *))(*assoc->bend_present))(
1438             assoc->backend, bprr);
1439
1440         if (!bprr->request)
1441             return 0;
1442     }
1443     apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1444     resp = (Z_PresentResponse *)odr_malloc (assoc->encode, sizeof(*resp));
1445     presst = (int *)odr_malloc (assoc->encode, sizeof(*presst));
1446     next = (int *)odr_malloc (assoc->encode, sizeof(*next));
1447     num = (int *)odr_malloc (assoc->encode, sizeof(*num));
1448     *presst = 0;
1449     *next = 0;
1450     *num = *req->numberOfRecordsRequested;
1451
1452     apdu->which = Z_APDU_presentResponse;
1453     apdu->u.presentResponse = resp;
1454     resp->referenceId = req->referenceId;
1455     resp->otherInfo = 0;
1456
1457     resp->records =
1458         pack_records(assoc, req->resultSetId, *req->resultSetStartPoint,
1459                      num, req->recordComposition, next, presst, form,
1460                      req->referenceId);
1461     if (!resp->records)
1462         return 0;
1463     resp->numberOfRecordsReturned = num;
1464     resp->presentStatus = presst;
1465     resp->nextResultSetPosition = next;
1466
1467     return apdu;
1468 }
1469
1470 /*
1471  * Scan was implemented rather in a hurry, and with support for only the basic
1472  * elements of the service in the backend API. Suggestions are welcome.
1473  */
1474 static Z_APDU *process_scanRequest(association *assoc, request *reqb, int *fd)
1475 {
1476     Z_ScanRequest *req = reqb->request->u.scanRequest;
1477     Z_APDU *apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1478     Z_ScanResponse *res = (Z_ScanResponse *)
1479         odr_malloc (assoc->encode, sizeof(*res));
1480     int *scanStatus = (int *)
1481         odr_malloc (assoc->encode, sizeof(*scanStatus));
1482     int *numberOfEntriesReturned = (int *)
1483         odr_malloc (assoc->encode, sizeof(*numberOfEntriesReturned));
1484     Z_ListEntries *ents = (Z_ListEntries *)
1485         odr_malloc (assoc->encode, sizeof(*ents));
1486     Z_DiagRecs *diagrecs_p = NULL;
1487     oident *attent;
1488     bend_scanrequest srq;
1489     bend_scanresult *srs;
1490     oident *attset;
1491
1492     logf(LOG_LOG, "Got ScanRequest");
1493     *scanStatus = Z_Scan_failure;
1494     *numberOfEntriesReturned = 0;
1495
1496     apdu->which = Z_APDU_scanResponse;
1497     apdu->u.scanResponse = res;
1498     res->referenceId = req->referenceId;
1499     res->stepSize = 0;
1500     res->scanStatus = scanStatus;
1501     res->numberOfEntriesReturned = numberOfEntriesReturned;
1502     res->positionOfTerm = 0;
1503     res->entries = ents;
1504     ents->num_entries = 0;
1505     ents->entries = NULL;
1506     ents->num_nonsurrogateDiagnostics = 0;
1507     ents->nonsurrogateDiagnostics = NULL;
1508     res->attributeSet = 0;
1509     res->otherInfo = 0;
1510
1511     if (req->attributeSet && (!(attent = oid_getentbyoid(req->attributeSet)) ||
1512                               attent->oclass != CLASS_ATTSET
1513                               || attent->value != VAL_BIB1))
1514         diagrecs_p = diagrecs(assoc, 121, 0);
1515     else if (req->stepSize && *req->stepSize > 0)
1516         diagrecs_p = diagrecs(assoc, 205, 0);
1517     else
1518     {
1519         if (req->databaseNames)
1520         {
1521             int i;
1522             for (i = 0; i < req->num_databaseNames; i++)
1523                 logf (LOG_LOG, "Database '%s'", req->databaseNames[i]);
1524         }
1525         srq.num_bases = req->num_databaseNames;
1526         srq.basenames = req->databaseNames;
1527         srq.num_entries = *req->numberOfTermsRequested;
1528         srq.term = req->termListAndStartPoint;
1529         srq.referenceId = req->referenceId;
1530         srq.stream = assoc->encode;
1531         if (!(attset = oid_getentbyoid(req->attributeSet)) ||
1532             attset->oclass != CLASS_RECSYN)
1533             srq.attributeset = VAL_NONE;
1534         else
1535             srq.attributeset = attset->value;
1536         log_scan_term (req->termListAndStartPoint, attset->value);
1537         srq.term_position = req->preferredPositionInResponse ?
1538             *req->preferredPositionInResponse : 1;
1539         if (!(srs = bend_scan(assoc->backend, &srq, 0)))
1540             diagrecs_p = diagrecs(assoc, 2, 0);
1541         else if (srs->errcode)
1542             diagrecs_p = diagrecs(assoc, srs->errcode, srs->errstring);
1543         else
1544         {
1545             int i;
1546             Z_Entry **tab = (Z_Entry **)
1547                 odr_malloc (assoc->encode, sizeof(*tab) * srs->num_entries);
1548
1549             if (srs->status == BEND_SCAN_PARTIAL)
1550                 *scanStatus = Z_Scan_partial_5;
1551             else
1552                 *scanStatus = Z_Scan_success;
1553             ents->entries = tab;
1554             ents->num_entries = srs->num_entries;
1555             res->numberOfEntriesReturned = &ents->num_entries;
1556             res->positionOfTerm = &srs->term_position;
1557             for (i = 0; i < srs->num_entries; i++)
1558             {
1559                 Z_Entry *e;
1560                 Z_TermInfo *t;
1561                 Odr_oct *o;
1562
1563                 tab[i] = e = (Z_Entry *)odr_malloc(assoc->encode, sizeof(*e));
1564                 if (srs->entries[i].occurrences >= 0)
1565                 {
1566                     e->which = Z_Entry_termInfo;
1567                     e->u.termInfo = t = (Z_TermInfo *)
1568                         odr_malloc(assoc->encode, sizeof(*t));
1569                     t->suggestedAttributes = 0;
1570                     t->displayTerm = 0;
1571                     t->alternativeTerm = 0;
1572                     t->byAttributes = 0;
1573                     t->otherTermInfo = 0;
1574                     t->globalOccurrences = &srs->entries[i].occurrences;
1575                     t->term = (Z_Term *)
1576                         odr_malloc(assoc->encode, sizeof(*t->term));
1577                     t->term->which = Z_Term_general;
1578                     t->term->u.general = o =
1579                         (Odr_oct *)odr_malloc(assoc->encode, sizeof(Odr_oct));
1580                     o->buf = (unsigned char *)
1581                         odr_malloc(assoc->encode, o->len = o->size =
1582                                    strlen(srs->entries[i].term));
1583                     memcpy(o->buf, srs->entries[i].term, o->len);
1584                     logf(LOG_DEBUG, "  term #%d: '%s' (%d)", i,
1585                          srs->entries[i].term, srs->entries[i].occurrences);
1586                 }
1587                 else
1588                 {
1589                     Z_DiagRecs *drecs = diagrecs (assoc,
1590                                                   srs->entries[i].errcode,
1591                                                   srs->entries[i].errstring);
1592                     assert (drecs->num_diagRecs == 1);
1593                     e->which = Z_Entry_surrogateDiagnostic;
1594                     assert (drecs->diagRecs[0]);
1595                     e->u.surrogateDiagnostic = drecs->diagRecs[0];
1596                 }
1597             }
1598         }
1599     }
1600     if (diagrecs_p)
1601     {
1602         ents->num_nonsurrogateDiagnostics = diagrecs_p->num_diagRecs;
1603         ents->nonsurrogateDiagnostics = diagrecs_p->diagRecs;
1604     }
1605     return apdu;
1606 }
1607
1608 static Z_APDU *process_sortRequest(association *assoc, request *reqb,
1609     int *fd)
1610 {
1611     Z_SortRequest *req = reqb->request->u.sortRequest;
1612     Z_SortResponse *res = (Z_SortResponse *)
1613         odr_malloc (assoc->encode, sizeof(*res));
1614     bend_sort_rr *bsrr = (bend_sort_rr *)
1615         odr_malloc (assoc->encode, sizeof(*bsrr));
1616
1617     Z_APDU *apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1618
1619     logf(LOG_LOG, "Got SortRequest.");
1620
1621 #ifdef ASN_COMPILED
1622     bsrr->num_input_setnames = req->num_inputResultSetNames;
1623     bsrr->input_setnames = req->inputResultSetNames;
1624 #else
1625     bsrr->num_input_setnames = req->inputResultSetNames->num_strings;
1626     bsrr->input_setnames = req->inputResultSetNames->strings;
1627 #endif
1628     bsrr->referenceId = req->referenceId;
1629     bsrr->output_setname = req->sortedResultSetName;
1630     bsrr->sort_sequence = req->sortSequence;
1631     bsrr->stream = assoc->encode;
1632
1633     bsrr->sort_status = Z_SortStatus_failure;
1634     bsrr->errcode = 0;
1635     bsrr->errstring = 0;
1636
1637     ((int (*)(void *, bend_sort_rr *))(*assoc->bend_sort))(assoc->backend,
1638                                                            bsrr);
1639
1640     res->referenceId = bsrr->referenceId;
1641     res->sortStatus = (int *)
1642         odr_malloc (assoc->encode, sizeof(*res->sortStatus));
1643     *res->sortStatus = bsrr->sort_status;
1644     res->resultSetStatus = 0;
1645     if (bsrr->errcode)
1646     {
1647         Z_DiagRecs *dr = diagrecs (assoc, bsrr->errcode, bsrr->errstring);
1648 #ifdef ASN_COMPILED
1649         res->diagnostics = dr->diagRecs;
1650         res->num_diagnostics = dr->num_diagRecs;
1651 #else
1652         res->diagnostics = dr;
1653 #endif
1654     }
1655     else
1656     {
1657 #ifdef ASN_COMPILED
1658         res->num_diagnostics = 0;
1659 #endif
1660         res->diagnostics = 0;
1661     }
1662     res->otherInfo = 0;
1663
1664     apdu->which = Z_APDU_sortResponse;
1665     apdu->u.sortResponse = res;
1666     return apdu;
1667 }
1668
1669 static Z_APDU *process_deleteRequest(association *assoc, request *reqb,
1670     int *fd)
1671 {
1672     Z_DeleteResultSetRequest *req = reqb->request->u.deleteResultSetRequest;
1673     Z_DeleteResultSetResponse *res = (Z_DeleteResultSetResponse *)
1674         odr_malloc (assoc->encode, sizeof(*res));
1675     bend_delete_rr *bdrr = (bend_delete_rr *)
1676         odr_malloc (assoc->encode, sizeof(*bdrr));
1677     Z_APDU *apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1678
1679     logf(LOG_LOG, "Got DeleteRequest.");
1680
1681     bdrr->num_setnames = req->num_resultSetList;
1682     bdrr->setnames = req->resultSetList;
1683     bdrr->stream = assoc->encode;
1684     bdrr->function = *req->deleteFunction;
1685     bdrr->referenceId = req->referenceId;
1686
1687     ((int (*)(void *, bend_delete_rr *))
1688      (*assoc->bend_delete))(assoc->backend, bdrr);
1689
1690     res->referenceId = req->referenceId;
1691
1692     res->deleteOperationStatus = (int *)
1693         odr_malloc (assoc->encode, sizeof(*res->deleteOperationStatus));
1694     *res->deleteOperationStatus = bdrr->delete_status;
1695
1696     res->deleteListStatuses = 0;
1697     res->numberNotDeleted = 0;
1698     res->bulkStatuses = 0;
1699     res->deleteMessage = 0;
1700     res->otherInfo = 0;
1701
1702     apdu->which = Z_APDU_deleteResultSetResponse;
1703     apdu->u.deleteResultSetResponse = res;
1704     return apdu;
1705 }
1706
1707 static void process_close(association *assoc, request *reqb)
1708 {
1709     Z_Close *req = reqb->request->u.close;
1710     static char *reasons[] =
1711     {
1712         "finished",
1713         "shutdown",
1714         "systemProblem",
1715         "costLimit",
1716         "resources",
1717         "securityViolation",
1718         "protocolError",
1719         "lackOfActivity",
1720         "peerAbort",
1721         "unspecified"
1722     };
1723
1724     logf(LOG_LOG, "Got Close, reason %s, message %s",
1725         reasons[*req->closeReason], req->diagnosticInformation ?
1726         req->diagnosticInformation : "NULL");
1727     if (assoc->version < 3) /* to make do_force respond with close */
1728         assoc->version = 3;
1729     do_close_req(assoc, Z_Close_finished,
1730                  "Association terminated by client", reqb);
1731 }
1732
1733 void save_referenceId (request *reqb, Z_ReferenceId *refid)
1734 {
1735     if (refid)
1736     {
1737         reqb->len_refid = refid->len;
1738         reqb->refid = (char *)nmem_malloc (reqb->request_mem, refid->len);
1739         memcpy (reqb->refid, refid->buf, refid->len);
1740     }
1741     else
1742     {
1743         reqb->len_refid = 0;
1744         reqb->refid = NULL;
1745     }
1746 }
1747
1748 void bend_request_send (bend_association a, bend_request req, Z_APDU *res)
1749 {
1750     process_response (a, req, res);
1751 }
1752
1753 bend_request bend_request_mk (bend_association a)
1754 {
1755     request *nreq = request_get (&a->outgoing);
1756     nreq->request_mem = nmem_create ();
1757     return nreq;
1758 }
1759
1760 Z_ReferenceId *bend_request_getid (ODR odr, bend_request req)
1761 {
1762     Z_ReferenceId *id;
1763     if (!req->refid)
1764         return 0;
1765     id = (Odr_oct *)odr_malloc (odr, sizeof(*odr));
1766     id->buf = (unsigned char *)odr_malloc (odr, req->len_refid);
1767     id->len = id->size = req->len_refid;
1768     memcpy (id->buf, req->refid, req->len_refid);
1769     return id;
1770 }
1771
1772 void bend_request_destroy (bend_request *req)
1773 {
1774     nmem_destroy((*req)->request_mem);
1775     request_release(*req);
1776     *req = NULL;
1777 }
1778
1779 int bend_backend_respond (bend_association a, bend_request req)
1780 {
1781     return process_request (a, req);
1782 }
1783
1784 void bend_request_setdata(bend_request r, void *p)
1785 {
1786     r->clientData = p;
1787 }
1788
1789 void *bend_request_getdata(bend_request r)
1790 {
1791     return r->clientData;
1792 }
1793
1794 static Z_APDU *process_ESRequest(association *assoc, request *reqb, int *fd)
1795 {
1796     bend_esrequest_rr esrequest;
1797
1798     Z_ExtendedServicesRequest *req = reqb->request->u.extendedServicesRequest;
1799     Z_APDU *apdu = zget_APDU(assoc->encode, Z_APDU_extendedServicesResponse);
1800
1801     Z_ExtendedServicesResponse *resp = apdu->u.extendedServicesResponse;
1802
1803     logf(LOG_DEBUG,"inside Process esRequest");
1804
1805     esrequest.esr = reqb->request->u.extendedServicesRequest;
1806     esrequest.stream = assoc->encode;
1807     esrequest.errcode = 0;
1808     esrequest.errstring = NULL;
1809     esrequest.request = reqb;
1810     esrequest.association = assoc;
1811     esrequest.referenceId = req->referenceId;
1812
1813     ((int (*)(void *, bend_esrequest_rr *))(*assoc->bend_esrequest))
1814         (assoc->backend, &esrequest);
1815
1816     /* If the response is being delayed, return NULL */
1817     if (esrequest.request == NULL)
1818         return(NULL);
1819
1820     resp->referenceId = req->referenceId;
1821
1822     if ( esrequest.errcode == 0 )
1823     {
1824         /* Backend service indicates request will be processed */
1825         logf(LOG_DEBUG,"Request will be processed...Good !");
1826         *resp->operationStatus = Z_ExtendedServicesResponse_done;
1827     }
1828     else
1829     {
1830         /* Backend indicates error, request will not be processed */
1831         logf(LOG_DEBUG,"Request will not be processed...BAD !");
1832         *resp->operationStatus = Z_ExtendedServicesResponse_failure;
1833     }
1834     /* Do something with the members of bend_extendedservice */
1835
1836     logf(LOG_DEBUG,"Send the result apdu");
1837
1838     return apdu;
1839 }