server/seshigh.c

   1 /*
   2  * Copyright (c) 1995-2000, Index Data
   3  * See the file LICENSE for details.
   4  *
   5  * $Log: seshigh.c,v $
   6  * Revision 1.105  2000-07-06 10:38:47  adam
   7  * Enhanced option --enable-tcpd.
   8  *
   9  * Revision 1.104  2000/04/05 07:39:55  adam
  10  * Added shared library support (libtool).
  11  *
  12  * Revision 1.103  2000/03/20 19:06:25  adam
  13  * Added Segment request for fronend server. Work on admin for client.
  14  *
  15  * Revision 1.102  2000/03/15 12:59:49  adam
  16  * Added handle member to statserv_control.
  17  *
  18  * Revision 1.101  2000/01/12 14:36:07  adam
  19  * Added printing stream (ODR) for backend functions.
  20  *
  21  * Revision 1.100  1999/12/16 23:36:19  adam
  22  * Implemented ILL protocol. Minor updates ASN.1 compiler.
  23  *
  24  * Revision 1.99  1999/11/30 13:47:12  adam
  25  * Improved installation. Moved header files to include/yaz.
  26  *
  27  * Revision 1.98  1999/11/29 15:12:27  adam
  28  * Changed the way implementationName - and version is set.
  29  *
  30  * Revision 1.96  1999/11/04 14:58:44  adam
  31  * Added status elements for backend delete result set handler.
  32  * Updated delete result result set command for client.
  33  *
  34  * Revision 1.95  1999/10/11 10:01:24  adam
  35  * Implemented bend_sort_rr handler for frontend server.
  36  *
  37  * Revision 1.94  1999/08/27 09:40:32  adam
  38  * Renamed logf function to yaz_log. Removed VC++ project files.
  39  *
  40  * Revision 1.93  1999/07/06 12:17:15  adam
  41  * Added option -1 that runs server once (for profiling purposes).
  42  *
  43  * Revision 1.92  1999/06/17 10:54:45  adam
  44  * Added facility to specify implementation version - and name
  45  * for server.
  46  *
  47  * Revision 1.91  1999/06/01 14:29:12  adam
  48  * Work on Extended Services.
  49  *
  50  * Revision 1.90  1999/05/27 13:02:20  adam
  51  * Assigned OID for old DB Update (VAL_DBUPDATE0).
  52  *
  53  * Revision 1.89  1999/05/26 15:24:26  adam
  54  * Fixed minor bugs regarding DB Update (introduced by previous commit).
  55  *
  56  * Revision 1.88  1999/04/20 09:56:48  adam
  57  * Added 'name' paramter to encoder/decoder routines (typedef Odr_fun).
  58  * Modified all encoders/decoders to reflect this change.
  59  *
  60  * Revision 1.87  1999/03/31 11:18:25  adam
  61  * Implemented odr_strdup. Added Reference ID to backend server API.
  62  *
  63  * Revision 1.86  1999/02/02 13:57:38  adam
  64  * Uses preprocessor define WIN32 instead of WINDOWS to build code
  65  * for Microsoft WIN32.
  66  *
  67  * Revision 1.85  1998/11/17 09:52:59  adam
  68  * Fixed minor bug (introduced by previous commit).
  69  *
  70  * Revision 1.84  1998/11/16 16:02:32  adam
  71  * Added loggin utilies, log_rpn_query and log_scan_term. These used
  72  * to be part of Zebra.
  73  *
  74  * Revision 1.83  1998/11/03 10:09:36  adam
  75  * Fixed bug regarding YC.
  76  *
  77  * Revision 1.82  1998/10/20 14:00:30  quinn
  78  * Fixed Scan
  79  *
  80  * Revision 1.81  1998/10/13 16:12:24  adam
  81  * Added support for Surrogate Diagnostics for Scan Term entries.
  82  *
  83  * Revision 1.80  1998/09/02 12:41:53  adam
  84  * Added decode stream in bend search structures.
  85  *
  86  * Revision 1.79  1998/08/19 16:10:08  adam
  87  * Changed som member names of DeleteResultSetRequest/Response.
  88  *
  89  * Revision 1.78  1998/08/03 10:23:55  adam
  90  * Fixed bug regarding Options for Sort.
  91  *
  92  * Revision 1.77  1998/07/20 12:38:42  adam
  93  * Implemented delete result set service to server API.
  94  *
  95  * Revision 1.76  1998/05/27 16:57:07  adam
  96  * Support for surrogate diagnostic records added for bend_fetch.
  97  *
  98  * Revision 1.75  1998/05/18 10:13:07  adam
  99  * Fixed call to es_request handler - extra argument was passed.
 100  *
 101  * Revision 1.74  1998/03/31 15:13:20  adam
 102  * Development towards compiled ASN.1.
 103  *
 104  * Revision 1.73  1998/03/31 11:07:45  adam
 105  * Furhter work on UNIverse resource report.
 106  * Added Extended Services handling in frontend server.
 107  *
 108  * Revision 1.72  1998/02/11 11:53:35  adam
 109  * Changed code so that it compiles as C++.
 110  *
 111  * Revision 1.71  1998/02/10 11:03:57  adam
 112  * Added support for extended handlers in backend server interface.
 113  *
 114  * Revision 1.70  1998/01/29 13:15:35  adam
 115  * Implemented sort for the backend interface.
 116  *
 117  * Revision 1.69  1997/09/30 11:48:12  adam
 118  * Fixed bug introduced by previous commit.
 119  *
 120  * Revision 1.68  1997/09/29 13:18:59  adam
 121  * Added function, oid_ent_to_oid, to replace the function
 122  * oid_getoidbyent, which is not thread safe.
 123  *
 124  * Revision 1.67  1997/09/17 12:10:40  adam
 125  * YAZ version 1.4.
 126  *
 127  * Revision 1.66  1997/09/05 15:26:44  adam
 128  * Added ODR encode in search and scen bend request structures.
 129  * Fixed a few enums that caused trouble with C++.
 130  *
 131  * Revision 1.65  1997/09/01 08:53:01  adam
 132  * New windows NT/95 port using MSV5.0. The test server 'ztest' was
 133  * moved a separate directory. MSV5.0 project server.dsp created.
 134  * As an option, the server can now operate as an NT service.
 135  *
 136  * Revision 1.64  1997/04/30 08:52:11  quinn
 137  * Null
 138  *
 139  * Revision 1.63  1996/10/11  11:57:26  quinn
 140  * Smallish
 141  *
 142  * Revision 1.62  1996/07/06  19:58:35  quinn
 143  * System headerfiles gathered in yconfig
 144  *
 145  * Revision 1.61  1996/06/10  08:56:16  quinn
 146  * Work on Summary.
 147  *
 148  * Revision 1.60  1996/05/30  11:03:10  quinn
 149  * Fixed NextresultSetPosition bug fixed.
 150  *
 151  * Revision 1.59  1996/05/14  09:26:46  quinn
 152  * Added attribute set to scan backend
 153  *
 154  * Revision 1.58  1996/02/20  12:53:04  quinn
 155  * Chanes to SCAN
 156  *
 157  * Revision 1.57  1996/01/02  08:57:47  quinn
 158  * Changed enums in the ASN.1 .h files to #defines. Changed oident.class to oclass
 159  *
 160  * Revision 1.56  1995/12/14  11:09:57  quinn
 161  * Work on Explain
 162  *
 163  * Revision 1.55  1995/11/08  17:41:37  quinn
 164  * Smallish.
 165  *
 166  * Revision 1.54  1995/11/08  15:11:29  quinn
 167  * Log of close transmit.
 168  *
 169  * Revision 1.53  1995/11/01  13:54:58  quinn
 170  * Minor adjustments
 171  *
 172  * Revision 1.52  1995/11/01  12:19:13  quinn
 173  * Second attempt to fix same bug.
 174  *
 175  * Revision 1.50  1995/10/25  16:58:32  quinn
 176  * Simple.
 177  *
 178  * Revision 1.49  1995/10/16  13:51:53  quinn
 179  * Changes to provide Especs to the backend.
 180  *
 181  * Revision 1.48  1995/10/06  08:51:20  quinn
 182  * Added Write-buffer.
 183  *
 184  * Revision 1.47  1995/08/29  14:24:16  quinn
 185  * Added second half of close-handshake
 186  *
 187  * Revision 1.46  1995/08/29  11:17:58  quinn
 188  * Added code to receive close
 189  *
 190  * Revision 1.45  1995/08/21  09:11:00  quinn
 191  * Smallish fixes to suppport new formats.
 192  *
 193  * Revision 1.44  1995/08/17  12:45:25  quinn
 194  * Fixed minor problems with GRS-1. Added support in c&s.
 195  *
 196  * Revision 1.43  1995/08/15  12:00:31  quinn
 197  * Updated External
 198  *
 199  * Revision 1.42  1995/08/15  11:16:50  quinn
 200  *
 201  * Revision 1.41  1995/08/02  10:23:06  quinn
 202  * Smallish
 203  *
 204  * Revision 1.40  1995/07/31  14:34:26  quinn
 205  * Fixed bug in process_searchResponse (numberOfRecordsReturned).
 206  *
 207  * Revision 1.39  1995/06/27  13:21:00  quinn
 208  * SUTRS support
 209  *
 210  * Revision 1.38  1995/06/19  12:39:11  quinn
 211  * Fixed bug in timeout code. Added BER dumper.
 212  *
 213  * Revision 1.37  1995/06/16  13:16:14  quinn
 214  * Fixed Defaultdiagformat.
 215  *
 216  * Revision 1.36  1995/06/16  10:31:36  quinn
 217  * Added session timeout.
 218  *
 219  * Revision 1.35  1995/06/15  07:45:14  quinn
 220  * Moving to v3.
 221  *
 222  * Revision 1.34  1995/06/14  15:26:46  quinn
 223  * *** empty log message ***
 224  *
 225  * Revision 1.33  1995/06/06  14:57:05  quinn
 226  * Better diagnostics.
 227  *
 228  * Revision 1.32  1995/06/06  08:41:44  quinn
 229  * Better diagnostics.
 230  *
 231  * Revision 1.31  1995/06/06  08:15:37  quinn
 232  * Cosmetic.
 233  *
 234  * Revision 1.30  1995/06/05  10:53:32  quinn
 235  * Added a better SCAN.
 236  *
 237  * Revision 1.29  1995/06/01  11:25:03  quinn
 238  * Smallish.
 239  *
 240  * Revision 1.28  1995/06/01  11:21:01  quinn
 241  * Attempting to fix a bug in pack-records. replaced break with continue
 242  * for large records, according to standard.
 243  *
 244  * Revision 1.27  1995/05/29  08:12:06  quinn
 245  * Moved oid to util
 246  *
 247  * Revision 1.26  1995/05/18  13:02:12  quinn
 248  * Smallish.
 249  *
 250  * Revision 1.25  1995/05/17  08:42:26  quinn
 251  * Transfer auth info to backend. Allow backend to reject init gracefully.
 252  *
 253  * Revision 1.24  1995/05/16  08:51:04  quinn
 254  * License, documentation, and memory fixes
 255  *
 256  * Revision 1.23  1995/05/15  13:25:10  quinn
 257  * Fixed memory bug.
 258  *
 259  * Revision 1.22  1995/05/15  11:56:39  quinn
 260  * Asynchronous facilities. Restructuring of seshigh code.
 261  *
 262  * Revision 1.21  1995/05/02  08:53:19  quinn
 263  * Trying in vain to fix comm with ISODE
 264  *
 265  * Revision 1.20  1995/04/20  15:13:00  quinn
 266  * Cosmetic
 267  *
 268  * Revision 1.19  1995/04/18  08:15:34  quinn
 269  * Added dynamic memory allocation on encoding (whew). Code is now somewhat
 270  * neater. We'll make the same change for decoding one day.
 271  *
 272  * Revision 1.18  1995/04/17  11:28:25  quinn
 273  * Smallish
 274  *
 275  * Revision 1.17  1995/04/10  10:23:36  quinn
 276  * Some work to add scan and other things.
 277  *
 278  * Revision 1.16  1995/03/31  09:18:55  quinn
 279  * Added logging.
 280  *
 281  * Revision 1.15  1995/03/30  14:03:23  quinn
 282  * Added RFC1006 as separate library
 283  *
 284  * Revision 1.14  1995/03/30  12:18:17  quinn
 285  * Fixed bug.
 286  *
 287  * Revision 1.13  1995/03/30  09:09:24  quinn
 288  * Added state-handle and some support for asynchronous activities.
 289  *
 290  * Revision 1.12  1995/03/29  15:40:16  quinn
 291  * Ongoing work. Statserv is now dynamic by default
 292  *
 293  * Revision 1.11  1995/03/28  09:16:21  quinn
 294  * Added record packing to the search request
 295  *
 296  * Revision 1.10  1995/03/27  08:34:24  quinn
 297  * Added dynamic server functionality.
 298  * Released bindings to session.c (is now redundant)
 299  *
 300  * Revision 1.9  1995/03/22  15:01:26  quinn
 301  * Adjusting record packing.
 302  *
 303  * Revision 1.8  1995/03/22  10:13:21  quinn
 304  * Working on record packer
 305  *
 306  * Revision 1.7  1995/03/21  15:53:31  quinn
 307  * Little changes.
 308  *
 309  * Revision 1.6  1995/03/21  12:30:09  quinn
 310  * Beginning to add support for record packing.
 311  *
 312  * Revision 1.5  1995/03/17  10:44:13  quinn
 313  * Added catch of null-string in makediagrec
 314  *
 315  * Revision 1.4  1995/03/17  10:18:08  quinn
 316  * Added memory management.
 317  *
 318  * Revision 1.3  1995/03/16  17:42:39  quinn
 319  * Little changes
 320  *
 321  * Revision 1.2  1995/03/16  13:29:01  quinn
 322  * Partitioned server.
 323  *
 324  * Revision 1.1  1995/03/15  16:02:10  quinn
 325  * Modded session.c to seshigh.c
 326  *
 327  */
 328
 329 /*
 330  * Frontend server logic.
 331  *
 332  * This code receives incoming APDUs, and handles client requests by means
 333  * of the backend API.
 334  *
 335  * Some of the code is getting quite involved, compared to simpler servers -
 336  * primarily because it is asynchronous both in the communication with
 337  * the user and the backend. We think the complexity will pay off in
 338  * the form of greater flexibility when more asynchronous facilities
 339  * are implemented.
 340  *
 341  * Memory management has become somewhat involved. In the simple case, where
 342  * only one PDU is pending at a time, it will simply reuse the same memory,
 343  * once it has found its working size. When we enable multiple concurrent
 344  * operations, perhaps even with multiple parallel calls to the backend, it
 345  * will maintain a pool of buffers for encoding and decoding, trying to
 346  * minimize memory allocation/deallocation during normal operation.
 347  *
 348  * TODOs include (and will be done in order of public interest):
 349  *
 350  * Support for EXPLAIN - provide simple meta-database system.
 351  * Support for access control.
 352  * Support for resource control.
 353  * Support for extended services - primarily Item Order.
 354  * Rest of Z39.50-1994
 355  *
 356  */
 357
 358 #include <stdlib.h>
 359 #include <stdio.h>
 360 #ifdef WIN32
 361 #include <process.h>
 362 #else
 363 #include <unistd.h>
 364 #endif
 365 #include <assert.h>
 366
 367 #include <yaz/yconfig.h>
 368 #include <yaz/xmalloc.h>
 369 #include <yaz/comstack.h>
 370 #include "eventl.h"
 371 #include "session.h"
 372 #include <yaz/proto.h>
 373 #include <yaz/oid.h>
 374 #include <yaz/log.h>
 375 #include <yaz/logrpn.h>
 376 #include <yaz/statserv.h>
 377
 378 #include <yaz/backend.h>
 379
 380 static int process_request(association *assoc, request *req, char **msg);
 381 void backend_response(IOCHAN i, int event);
 382 static int process_response(association *assoc, request *req, Z_APDU *res);
 383 static Z_APDU *process_initRequest(association *assoc, request *reqb);
 384 static Z_APDU *process_searchRequest(association *assoc, request *reqb,
 385     int *fd);
 386 static Z_APDU *response_searchRequest(association *assoc, request *reqb,
 387     bend_search_rr *bsrr, int *fd);
 388 static Z_APDU *process_presentRequest(association *assoc, request *reqb,
 389     int *fd);
 390 static Z_APDU *process_scanRequest(association *assoc, request *reqb, int *fd);
 391 static Z_APDU *process_sortRequest(association *assoc, request *reqb, int *fd);
 392 static void process_close(association *assoc, request *reqb);
 393 void save_referenceId (request *reqb, Z_ReferenceId *refid);
 394 static Z_APDU *process_deleteRequest(association *assoc, request *reqb,
 395     int *fd);
 396 static Z_APDU *process_segmentRequest (association *assoc, request *reqb);
 397
 398 static FILE *apduf = 0; /* for use in static mode */
 399 static statserv_options_block *control_block = 0;
 400
 401 /* Chas: Added in from DALI */
 402 static Z_APDU *process_ESRequest(association *assoc, request *reqb, int *fd);
 403 /* Chas: End of addition from DALI */
 404
 405 /*
 406  * Create and initialize a new association-handle.
 407  *  channel  : iochannel for the current line.
 408  *  link     : communications channel.
 409  * Returns: 0 or a new association handle.
 410  */
 411 association *create_association(IOCHAN channel, COMSTACK link)
 412 {
 413     association *anew;
 414
 415     if (!control_block)
 416         control_block = statserv_getcontrol();
 417     if (!(anew = (association *)xmalloc(sizeof(*anew))))
 418         return 0;
 419     anew->init = 0;
 420     anew->client_chan = channel;
 421     anew->client_link = link;
 422     if (!(anew->decode = odr_createmem(ODR_DECODE)) ||
 423         !(anew->encode = odr_createmem(ODR_ENCODE)))
 424         return 0;
 425     if (*control_block->apdufile)
 426     {
 427         char filename[256];
 428         FILE *f;
 429
 430         strcpy(filename, control_block->apdufile);
 431         if (!(anew->print = odr_createmem(ODR_PRINT)))
 432             return 0;
 433         if (*control_block->apdufile != '-')
 434         {
 435             strcpy(filename, control_block->apdufile);
 436             if (!control_block->dynamic)
 437             {
 438                 if (!apduf)
 439                 {
 440                     if (!(apduf = fopen(filename, "w")))
 441                     {
 442                         yaz_log(LOG_WARN|LOG_ERRNO, "%s", filename);
 443                         return 0;
 444                     }
 445                     setvbuf(apduf, 0, _IONBF, 0);
 446                 }
 447                 f = apduf;
 448             }
 449             else
 450             {
 451                 sprintf(filename + strlen(filename), ".%d", getpid());
 452                 if (!(f = fopen(filename, "w")))
 453                 {
 454                     yaz_log(LOG_WARN|LOG_ERRNO, "%s", filename);
 455                     return 0;
 456                 }
 457                 setvbuf(f, 0, _IONBF, 0);
 458             }
 459             odr_setprint(anew->print, f);
 460         }
 461     }
 462     else
 463         anew->print = 0;
 464     anew->input_buffer = 0;
 465     anew->input_buffer_len = 0;
 466     anew->backend = 0;
 467     anew->state = ASSOC_NEW;
 468     request_initq(&anew->incoming);
 469     request_initq(&anew->outgoing);
 470     anew->proto = cs_getproto(link);
 471     return anew;
 472 }
 473
 474 /*
 475  * Free association and release resources.
 476  */
 477 void destroy_association(association *h)
 478 {
 479     statserv_options_block *cb = statserv_getcontrol();
 480
 481     xfree(h->init);
 482     odr_destroy(h->decode);
 483     odr_destroy(h->encode);
 484     if (h->print)
 485         odr_destroy(h->print);
 486     if (h->input_buffer)
 487     xfree(h->input_buffer);
 488     if (h->backend)
 489         (*cb->bend_close)(h->backend);
 490     while (request_deq(&h->incoming));
 491     while (request_deq(&h->outgoing));
 492     request_delq(&h->incoming);
 493     request_delq(&h->outgoing);
 494     xfree(h);
 495     if (control_block && control_block->one_shot)
 496         exit (0);
 497 }
 498
 499 static void do_close_req(association *a, int reason, char *message,
 500                          request *req)
 501 {
 502     Z_APDU apdu;
 503     Z_Close *cls = zget_Close(a->encode);
 504
 505     /* Purge request queue */
 506     while (request_deq(&a->incoming));
 507     while (request_deq(&a->outgoing));
 508     if (a->version >= 3)
 509     {
 510         yaz_log(LOG_LOG, "Sending Close PDU, reason=%d, message=%s",
 511             reason, message ? message : "none");
 512         apdu.which = Z_APDU_close;
 513         apdu.u.close = cls;
 514         *cls->closeReason = reason;
 515         cls->diagnosticInformation = message;
 516         process_response(a, req, &apdu);
 517         iochan_settimeout(a->client_chan, 60);
 518     }
 519     else
 520     {
 521         yaz_log(LOG_DEBUG, "v2 client. No Close PDU");
 522         iochan_setevent(a->client_chan, EVENT_TIMEOUT); /* force imm close */
 523     }
 524     a->state = ASSOC_DEAD;
 525 }
 526
 527 static void do_close(association *a, int reason, char *message)
 528 {
 529     do_close_req (a, reason, message, request_get(&a->outgoing));
 530 }
 531
 532 /*
 533  * This is where PDUs from the client are read and the further
 534  * processing is initiated. Flow of control moves down through the
 535  * various process_* functions below, until the encoded result comes back up
 536  * to the output handler in here.
 537  *
 538  *  h     : the I/O channel that has an outstanding event.
 539  *  event : the current outstanding event.
 540  */
 541 void ir_session(IOCHAN h, int event)
 542 {
 543     int res;
 544     association *assoc = (association *)iochan_getdata(h);
 545     COMSTACK conn = assoc->client_link;
 546     request *req;
 547
 548     assert(h && conn && assoc);
 549     if (event == EVENT_TIMEOUT)
 550     {
 551         if (assoc->state != ASSOC_UP)
 552         {
 553             yaz_log(LOG_LOG, "Final timeout - closing connection.");
 554             cs_close(conn);
 555             destroy_association(assoc);
 556             iochan_destroy(h);
 557         }
 558         else
 559         {
 560             yaz_log(LOG_LOG, "Session idle too long. Sending close.");
 561             do_close(assoc, Z_Close_lackOfActivity, 0);
 562         }
 563         return;
 564     }
 565     if (event & EVENT_INPUT || event & EVENT_WORK) /* input */
 566     {
 567         if (event & EVENT_INPUT)
 568         {
 569             yaz_log(LOG_DEBUG, "ir_session (input)");
 570             assert(assoc && conn);
 571             /* We aren't speaking to this fellow */
 572             if (assoc->state == ASSOC_DEAD)
 573             {
 574                 yaz_log(LOG_LOG, "Closed connection after reject");
 575                 cs_close(conn);
 576                 destroy_association(assoc);
 577                 iochan_destroy(h);
 578                 return;
 579             }
 580             if ((res = cs_get(conn, &assoc->input_buffer,
 581                 &assoc->input_buffer_len)) <= 0)
 582             {
 583                 yaz_log(LOG_LOG, "Connection closed by client");
 584                 cs_close(conn);
 585                 destroy_association(assoc);
 586                 iochan_destroy(h);
 587                 return;
 588             }
 589             else if (res == 1) /* incomplete read - wait for more  */
 590                 return;
 591             if (cs_more(conn)) /* more stuff - call us again later, please */
 592                 iochan_setevent(h, EVENT_INPUT);
 593
 594             /* we got a complete PDU. Let's decode it */
 595             yaz_log(LOG_DEBUG, "Got PDU, %d bytes", res);
 596             req = request_get(&assoc->incoming); /* get a new request structure */
 597             odr_reset(assoc->decode);
 598             odr_setbuf(assoc->decode, assoc->input_buffer, res, 0);
 599             if (!z_APDU(assoc->decode, &req->request, 0, 0))
 600             {
 601                 yaz_log(LOG_LOG, "ODR error on incoming PDU: %s [near byte %d] ",
 602                     odr_errmsg(odr_geterror(assoc->decode)),
 603                     odr_offset(assoc->decode));
 604                 yaz_log(LOG_LOG, "PDU dump:");
 605                 odr_dumpBER(log_file(), assoc->input_buffer, res);
 606                 do_close(assoc, Z_Close_protocolError, "Malformed package");
 607                 return;
 608             }
 609             req->request_mem = odr_extract_mem(assoc->decode);
 610             if (assoc->print && !z_APDU(assoc->print, &req->request, 0, 0))
 611             {
 612                 yaz_log(LOG_WARN, "ODR print error: %s",
 613                     odr_errmsg(odr_geterror(assoc->print)));
 614                 odr_reset(assoc->print);
 615             }
 616             request_enq(&assoc->incoming, req);
 617         }
 618
 619         /* can we do something yet? */
 620         req = request_head(&assoc->incoming);
 621         if (req->state == REQUEST_IDLE)
 622         {
 623             char *msg;
 624             request_deq(&assoc->incoming);
 625             if (process_request(assoc, req, &msg) < 0)
 626                 do_close_req(assoc, Z_Close_systemProblem, msg, req);
 627         }
 628     }
 629     if (event & EVENT_OUTPUT)
 630     {
 631         request *req = request_head(&assoc->outgoing);
 632
 633         yaz_log(LOG_DEBUG, "ir_session (output)");
 634         req->state = REQUEST_PENDING;
 635         switch (res = cs_put(conn, req->response, req->len_response))
 636         {
 637             case -1:
 638                 yaz_log(LOG_LOG, "Connection closed by client");
 639                 cs_close(conn);
 640                 destroy_association(assoc);
 641                 iochan_destroy(h);
 642                 break;
 643             case 0: /* all sent - release the request structure */
 644                 yaz_log(LOG_DEBUG, "Wrote PDU, %d bytes", req->len_response);
 645                 nmem_destroy(req->request_mem);
 646                 request_deq(&assoc->outgoing);
 647                 request_release(req);
 648                 if (!request_head(&assoc->outgoing))
 649                     iochan_clearflag(h, EVENT_OUTPUT);
 650                 break;
 651             /* value of 1 -- partial send -- is simply ignored */
 652         }
 653     }
 654     if (event & EVENT_EXCEPT)
 655     {
 656         yaz_log(LOG_DEBUG, "ir_session (exception)");
 657         cs_close(conn);
 658         destroy_association(assoc);
 659         iochan_destroy(h);
 660     }
 661 }
 662
 663 /*
 664  * Initiate request processing.
 665  */
 666 static int process_request(association *assoc, request *req, char **msg)
 667 {
 668     int fd = -1;
 669     Z_APDU *res;
 670     int retval;
 671
 672     *msg = "Unknown Error";
 673     assert(req && req->state == REQUEST_IDLE);
 674     if (req->request->which != Z_APDU_initRequest && !assoc->init)
 675     {
 676         *msg = "Missing InitRequest";
 677         return -1;
 678     }
 679     switch (req->request->which)
 680     {
 681     case Z_APDU_initRequest:
 682         res = process_initRequest(assoc, req); break;
 683     case Z_APDU_searchRequest:
 684         res = process_searchRequest(assoc, req, &fd); break;
 685     case Z_APDU_presentRequest:
 686         res = process_presentRequest(assoc, req, &fd); break;
 687     case Z_APDU_scanRequest:
 688         if (assoc->init->bend_scan)
 689             res = process_scanRequest(assoc, req, &fd);
 690         else
 691         {
 692             *msg = "Cannot handle Scan APDU";
 693             return -1;
 694         }
 695         break;
 696     case Z_APDU_extendedServicesRequest:
 697         if (assoc->init->bend_esrequest)
 698             res = process_ESRequest(assoc, req, &fd);
 699         else
 700         {
 701             *msg = "Cannot handle Extended Services APDU";
 702             return -1;
 703         }
 704         break;
 705     case Z_APDU_sortRequest:
 706         if (assoc->init->bend_sort)
 707             res = process_sortRequest(assoc, req, &fd);
 708         else
 709         {
 710             *msg = "Cannot handle Sort APDU";
 711             return -1;
 712         }
 713         break;
 714     case Z_APDU_close:
 715         process_close(assoc, req);
 716         return 0;
 717     case Z_APDU_deleteResultSetRequest:
 718         if (assoc->init->bend_delete)
 719             res = process_deleteRequest(assoc, req, &fd);
 720         else
 721         {
 722             *msg = "Cannot handle Delete APDU";
 723             return -1;
 724         }
 725         break;
 726     case Z_APDU_segmentRequest:
 727         if (assoc->init->bend_segment)
 728         {
 729             res = process_segmentRequest (assoc, req);
 730         }
 731         else
 732         {
 733             *msg = "Cannot handle Segment APDU";
 734             return -1;
 735         }
 736         break;
 737     default:
 738         *msg = "Bad APDU received";
 739         return -1;
 740     }
 741     if (res)
 742     {
 743         yaz_log(LOG_DEBUG, "  result immediately available");
 744         retval = process_response(assoc, req, res);
 745     }
 746     else if (fd < 0)
 747     {
 748         yaz_log(LOG_DEBUG, "  result unavailble");
 749         retval = 0;
 750     }
 751     else /* no result yet - one will be provided later */
 752     {
 753         IOCHAN chan;
 754
 755         /* Set up an I/O handler for the fd supplied by the backend */
 756
 757         yaz_log(LOG_DEBUG, "   establishing handler for result");
 758         req->state = REQUEST_PENDING;
 759         if (!(chan = iochan_create(fd, backend_response, EVENT_INPUT)))
 760             abort();
 761         iochan_setdata(chan, assoc);
 762         retval = 0;
 763     }
 764     return retval;
 765 }
 766
 767 /*
 768  * Handle message from the backend.
 769  */
 770 void backend_response(IOCHAN i, int event)
 771 {
 772     association *assoc = (association *)iochan_getdata(i);
 773     request *req = request_head(&assoc->incoming);
 774     Z_APDU *res;
 775     int fd;
 776
 777     yaz_log(LOG_DEBUG, "backend_response");
 778     assert(assoc && req && req->state != REQUEST_IDLE);
 779     /* determine what it is we're waiting for */
 780     switch (req->request->which)
 781     {
 782         case Z_APDU_searchRequest:
 783             res = response_searchRequest(assoc, req, 0, &fd); break;
 784 #if 0
 785         case Z_APDU_presentRequest:
 786             res = response_presentRequest(assoc, req, 0, &fd); break;
 787         case Z_APDU_scanRequest:
 788             res = response_scanRequest(assoc, req, 0, &fd); break;
 789 #endif
 790         default:
 791             yaz_log(LOG_WARN, "Serious programmer's lapse or bug");
 792             abort();
 793     }
 794     if ((res && process_response(assoc, req, res) < 0) || fd < 0)
 795     {
 796         yaz_log(LOG_LOG, "Fatal error when talking to backend");
 797         do_close(assoc, Z_Close_systemProblem, 0);
 798         iochan_destroy(i);
 799         return;
 800     }
 801     else if (!res) /* no result yet - try again later */
 802     {
 803         yaz_log(LOG_DEBUG, "   no result yet");
 804         iochan_setfd(i, fd); /* in case fd has changed */
 805     }
 806 }
 807
 808 /*
 809  * Encode response, and transfer the request structure to the outgoing queue.
 810  */
 811 static int process_response(association *assoc, request *req, Z_APDU *res)
 812 {
 813     odr_setbuf(assoc->encode, req->response, req->size_response, 1);
 814     if (!z_APDU(assoc->encode, &res, 0, 0))
 815     {
 816         yaz_log(LOG_WARN, "ODR error when encoding response: %s",
 817             odr_errmsg(odr_geterror(assoc->decode)));
 818         odr_reset(assoc->encode);
 819         return -1;
 820     }
 821     req->response = odr_getbuf(assoc->encode, &req->len_response,
 822         &req->size_response);
 823     odr_setbuf(assoc->encode, 0, 0, 0); /* don'txfree if we abort later */
 824     if (assoc->print && !z_APDU(assoc->print, &res, 0, 0))
 825     {
 826         yaz_log(LOG_WARN, "ODR print error: %s",
 827             odr_errmsg(odr_geterror(assoc->print)));
 828         odr_reset(assoc->print);
 829     }
 830     odr_reset(assoc->encode);
 831     req->state = REQUEST_IDLE;
 832     request_enq(&assoc->outgoing, req);
 833     /* turn the work over to the ir_session handler */
 834     iochan_setflag(assoc->client_chan, EVENT_OUTPUT);
 835     /* Is there more work to be done? give that to the input handler too */
 836 #if 1
 837     if (request_head(&assoc->incoming))
 838     {
 839         yaz_log (LOG_DEBUG, "more work to be done");
 840         iochan_setevent(assoc->client_chan, EVENT_WORK);
 841     }
 842 #endif
 843     return 0;
 844 }
 845
 846 /*
 847  * Handle init request.
 848  * At the moment, we don't check the options
 849  * anywhere else in the code - we just try not to do anything that would
 850  * break a naive client. We'll toss 'em into the association block when
 851  * we need them there.
 852  */
 853 static Z_APDU *process_initRequest(association *assoc, request *reqb)
 854 {
 855     statserv_options_block *cb = statserv_getcontrol();
 856     Z_InitRequest *req = reqb->request->u.initRequest;
 857     Z_APDU *apdu = zget_APDU(assoc->encode, Z_APDU_initResponse);
 858     Z_InitResponse *resp = apdu->u.initResponse;
 859     bend_initresult *binitres;
 860     char options[100];
 861
 862     xfree (assoc->init);
 863     assoc->init = xmalloc (sizeof(*assoc->init));
 864
 865     yaz_log(LOG_LOG, "Got initRequest");
 866     if (req->implementationId)
 867         yaz_log(LOG_LOG, "Id:        %s", req->implementationId);
 868     if (req->implementationName)
 869         yaz_log(LOG_LOG, "Name:      %s", req->implementationName);
 870     if (req->implementationVersion)
 871         yaz_log(LOG_LOG, "Version:   %s", req->implementationVersion);
 872
 873     assoc->init->stream = assoc->encode;
 874     assoc->init->print = assoc->print;
 875     assoc->init->auth = req->idAuthentication;
 876     assoc->init->referenceId = req->referenceId;
 877     assoc->init->implementation_version = 0;
 878     assoc->init->implementation_name = 0;
 879     assoc->init->bend_sort = NULL;
 880     assoc->init->bend_search = NULL;
 881     assoc->init->bend_present = NULL;
 882     assoc->init->bend_esrequest = NULL;
 883     assoc->init->bend_delete = NULL;
 884     assoc->init->bend_scan = NULL;
 885     assoc->init->bend_segment = NULL;
 886     assoc->init->bend_fetch = NULL;
 887     if (!(binitres = (*cb->bend_init)(assoc->init)))
 888     {
 889         yaz_log(LOG_WARN, "Bad response from backend.");
 890         return 0;
 891     }
 892
 893     assoc->backend = binitres->handle;
 894     if ((assoc->init->bend_sort))
 895         yaz_log (LOG_DEBUG, "Sort handler installed");
 896     if ((assoc->init->bend_search))
 897         yaz_log (LOG_DEBUG, "Search handler installed");
 898     if ((assoc->init->bend_present))
 899         yaz_log (LOG_DEBUG, "Present handler installed");
 900     if ((assoc->init->bend_esrequest))
 901         yaz_log (LOG_DEBUG, "ESRequest handler installed");
 902     if ((assoc->init->bend_delete))
 903         yaz_log (LOG_DEBUG, "Delete handler installed");
 904     if ((assoc->init->bend_scan))
 905         yaz_log (LOG_DEBUG, "Scan handler installed");
 906     if ((assoc->init->bend_segment))
 907         yaz_log (LOG_DEBUG, "Segment handler installed");
 908
 909     resp->referenceId = req->referenceId;
 910     *options = '\0';
 911     /* let's tell the client what we can do */
 912     if (ODR_MASK_GET(req->options, Z_Options_search))
 913     {
 914         ODR_MASK_SET(resp->options, Z_Options_search);
 915         strcat(options, "srch");
 916     }
 917     if (ODR_MASK_GET(req->options, Z_Options_present))
 918     {
 919         ODR_MASK_SET(resp->options, Z_Options_present);
 920         strcat(options, " prst");
 921     }
 922     if (ODR_MASK_GET(req->options, Z_Options_delSet) &&
 923         assoc->init->bend_delete)
 924     {
 925         ODR_MASK_SET(resp->options, Z_Options_delSet);
 926         strcat(options, " del");
 927     }
 928     if (ODR_MASK_GET(req->options, Z_Options_extendedServices) &&
 929         assoc->init->bend_esrequest)
 930     {
 931         ODR_MASK_SET(resp->options, Z_Options_extendedServices);
 932         strcat (options, " extendedServices");
 933     }
 934     if (ODR_MASK_GET(req->options, Z_Options_namedResultSets))
 935     {
 936         ODR_MASK_SET(resp->options, Z_Options_namedResultSets);
 937         strcat(options, " namedresults");
 938     }
 939     if (ODR_MASK_GET(req->options, Z_Options_scan) && assoc->init->bend_scan)
 940     {
 941         ODR_MASK_SET(resp->options, Z_Options_scan);
 942         strcat(options, " scan");
 943     }
 944     if (ODR_MASK_GET(req->options, Z_Options_concurrentOperations))
 945     {
 946         ODR_MASK_SET(resp->options, Z_Options_concurrentOperations);
 947         strcat(options, " concurop");
 948     }
 949     if (ODR_MASK_GET(req->options, Z_Options_sort) && assoc->init->bend_sort)
 950     {
 951         ODR_MASK_SET(resp->options, Z_Options_sort);
 952         strcat(options, " sort");
 953     }
 954     if (ODR_MASK_GET(req->protocolVersion, Z_ProtocolVersion_1))
 955     {
 956         ODR_MASK_SET(resp->protocolVersion, Z_ProtocolVersion_1);
 957         assoc->version = 2; /* 1 & 2 are equivalent */
 958     }
 959     if (ODR_MASK_GET(req->protocolVersion, Z_ProtocolVersion_2))
 960     {
 961         ODR_MASK_SET(resp->protocolVersion, Z_ProtocolVersion_2);
 962         assoc->version = 2;
 963     }
 964     if (ODR_MASK_GET(req->protocolVersion, Z_ProtocolVersion_3))
 965     {
 966         ODR_MASK_SET(resp->protocolVersion, Z_ProtocolVersion_3);
 967         assoc->version = 3;
 968     }
 969     yaz_log(LOG_LOG, "Negotiated to v%d: %s", assoc->version, options);
 970     assoc->maximumRecordSize = *req->maximumRecordSize;
 971     if (assoc->maximumRecordSize > control_block->maxrecordsize)
 972         assoc->maximumRecordSize = control_block->maxrecordsize;
 973     assoc->preferredMessageSize = *req->preferredMessageSize;
 974     if (assoc->preferredMessageSize > assoc->maximumRecordSize)
 975         assoc->preferredMessageSize = assoc->maximumRecordSize;
 976     resp->preferredMessageSize = &assoc->preferredMessageSize;
 977     resp->maximumRecordSize = &assoc->maximumRecordSize;
 978
 979     resp->implementationName = "GFS";
 980
 981     if (assoc->init->implementation_name)
 982     {
 983         char *nv = (char *)
 984             odr_malloc (assoc->encode,
 985                         strlen(assoc->init->implementation_name) + 10 +
 986                                strlen(resp->implementationName));
 987         sprintf (nv, "%s / %s",
 988                  resp->implementationName, assoc->init->implementation_name);
 989         resp->implementationName = nv;
 990     }
 991     if (assoc->init->implementation_version)
 992     {
 993         char *nv = (char *)
 994             odr_malloc (assoc->encode,
 995                         strlen(assoc->init->implementation_version) + 10 +
 996                                strlen(resp->implementationVersion));
 997         sprintf (nv, "YAZ %s / %s",
 998                  resp->implementationVersion,
 999                  assoc->init->implementation_version);
1000         resp->implementationVersion = nv;
1001     }
1002
1003     if (binitres->errcode)
1004     {
1005         yaz_log(LOG_LOG, "Connection rejected by backend.");
1006         *resp->result = 0;
1007         assoc->state = ASSOC_DEAD;
1008     }
1009     else
1010         assoc->state = ASSOC_UP;
1011     return apdu;
1012 }
1013
1014 /*
1015  * These functions should be merged.
1016  */
1017
1018 static void set_addinfo (Z_DefaultDiagFormat *dr, char *addinfo)
1019 {
1020 #if ASN_COMPILED
1021     dr->which = Z_DefaultDiagFormat_v2Addinfo;
1022     dr->u.v2Addinfo = addinfo ? addinfo : "";
1023 #else
1024     dr->which = Z_DiagForm_v2AddInfo;
1025     dr->addinfo = addinfo ? addinfo : "";
1026 #endif
1027 }
1028
1029 /*
1030  * nonsurrogate diagnostic record.
1031  */
1032 static Z_Records *diagrec(association *assoc, int error, char *addinfo)
1033 {
1034     int oid[OID_SIZE];
1035     Z_Records *rec = (Z_Records *)
1036         odr_malloc (assoc->encode, sizeof(*rec));
1037     oident bib1;
1038     int *err = (int *)
1039         odr_malloc (assoc->encode, sizeof(*err));
1040     Z_DiagRec *drec = (Z_DiagRec *)
1041         odr_malloc (assoc->encode, sizeof(*drec));
1042     Z_DefaultDiagFormat *dr = (Z_DefaultDiagFormat *)
1043         odr_malloc (assoc->encode, sizeof(*dr));
1044
1045     bib1.proto = assoc->proto;
1046     bib1.oclass = CLASS_DIAGSET;
1047     bib1.value = VAL_BIB1;
1048
1049     yaz_log(LOG_DEBUG, "Diagnostic: %d -- %s", error, addinfo ? addinfo :
1050         "NULL");
1051     *err = error;
1052     rec->which = Z_Records_NSD;
1053 #if ASN_COMPILED
1054     rec->u.nonSurrogateDiagnostic = dr;
1055 #else
1056     rec->u.nonSurrogateDiagnostic = drec;
1057     drec->which = Z_DiagRec_defaultFormat;
1058     drec->u.defaultFormat = dr;
1059 #endif
1060     dr->diagnosticSetId =
1061         odr_oiddup (assoc->encode, oid_ent_to_oid(&bib1, oid));
1062     dr->condition = err;
1063     set_addinfo (dr, addinfo);
1064     return rec;
1065 }
1066
1067 /*
1068  * surrogate diagnostic.
1069  */
1070 static Z_NamePlusRecord *surrogatediagrec(association *assoc, char *dbname,
1071                                           int error, char *addinfo)
1072 {
1073     int oid[OID_SIZE];
1074     Z_NamePlusRecord *rec = (Z_NamePlusRecord *)
1075         odr_malloc (assoc->encode, sizeof(*rec));
1076     int *err = (int *)odr_malloc (assoc->encode, sizeof(*err));
1077     oident bib1;
1078     Z_DiagRec *drec = (Z_DiagRec *)odr_malloc (assoc->encode, sizeof(*drec));
1079     Z_DefaultDiagFormat *dr = (Z_DefaultDiagFormat *)
1080         odr_malloc (assoc->encode, sizeof(*dr));
1081
1082     bib1.proto = assoc->proto;
1083     bib1.oclass = CLASS_DIAGSET;
1084     bib1.value = VAL_BIB1;
1085
1086     yaz_log(LOG_DEBUG, "SurrogateDiagnotic: %d -- %s", error, addinfo);
1087     *err = error;
1088     rec->databaseName = dbname;
1089     rec->which = Z_NamePlusRecord_surrogateDiagnostic;
1090     rec->u.surrogateDiagnostic = drec;
1091     drec->which = Z_DiagRec_defaultFormat;
1092     drec->u.defaultFormat = dr;
1093     dr->diagnosticSetId = odr_oiddup (assoc->encode,
1094                                       oid_ent_to_oid(&bib1, oid));
1095     dr->condition = err;
1096     set_addinfo (dr, addinfo);
1097
1098     return rec;
1099 }
1100
1101 /*
1102  * multiple nonsurrogate diagnostics.
1103  */
1104 static Z_DiagRecs *diagrecs(association *assoc, int error, char *addinfo)
1105 {
1106     int oid[OID_SIZE];
1107     Z_DiagRecs *recs = (Z_DiagRecs *)odr_malloc (assoc->encode, sizeof(*recs));
1108     int *err = (int *)odr_malloc (assoc->encode, sizeof(*err));
1109     oident bib1;
1110     Z_DiagRec **recp = (Z_DiagRec **)odr_malloc (assoc->encode, sizeof(*recp));
1111     Z_DiagRec *drec = (Z_DiagRec *)odr_malloc (assoc->encode, sizeof(*drec));
1112     Z_DefaultDiagFormat *rec = (Z_DefaultDiagFormat *)odr_malloc (assoc->encode, sizeof(*rec));
1113
1114     yaz_log(LOG_DEBUG, "DiagRecs: %d -- %s", error, addinfo ? addinfo : "");
1115     bib1.proto = assoc->proto;
1116     bib1.oclass = CLASS_DIAGSET;
1117     bib1.value = VAL_BIB1;
1118
1119     *err = error;
1120     recs->num_diagRecs = 1;
1121     recs->diagRecs = recp;
1122     recp[0] = drec;
1123     drec->which = Z_DiagRec_defaultFormat;
1124     drec->u.defaultFormat = rec;
1125
1126     rec->diagnosticSetId = odr_oiddup (assoc->encode,
1127                                       oid_ent_to_oid(&bib1, oid));
1128     rec->condition = err;
1129
1130 #ifdef ASN_COMPILED
1131     rec->which = Z_DefaultDiagFormat_v2Addinfo;
1132     rec->u.v2Addinfo = addinfo ? addinfo : "";
1133 #else
1134     rec->which = Z_DiagForm_v2AddInfo;
1135     rec->addinfo = addinfo ? addinfo : "";
1136 #endif
1137     return recs;
1138 }
1139
1140 static Z_Records *pack_records(association *a, char *setname, int start,
1141                                 int *num, Z_RecordComposition *comp,
1142                                 int *next, int *pres, oid_value format,
1143                                 Z_ReferenceId *referenceId)
1144 {
1145     int recno, total_length = 0, toget = *num, dumped_records = 0;
1146     Z_Records *records =
1147         (Z_Records *) odr_malloc (a->encode, sizeof(*records));
1148     Z_NamePlusRecordList *reclist =
1149         (Z_NamePlusRecordList *) odr_malloc (a->encode, sizeof(*reclist));
1150     Z_NamePlusRecord **list =
1151         (Z_NamePlusRecord **) odr_malloc (a->encode, sizeof(*list) * toget);
1152
1153     records->which = Z_Records_DBOSD;
1154     records->u.databaseOrSurDiagnostics = reclist;
1155     reclist->num_records = 0;
1156     reclist->records = list;
1157     *pres = Z_PRES_SUCCESS;
1158     *num = 0;
1159     *next = 0;
1160
1161     yaz_log(LOG_LOG, "Request to pack %d+%d", start, toget);
1162     yaz_log(LOG_DEBUG, "pms=%d, mrs=%d", a->preferredMessageSize,
1163         a->maximumRecordSize);
1164     for (recno = start; reclist->num_records < toget; recno++)
1165     {
1166         bend_fetch_rr freq;
1167         Z_NamePlusRecord *thisrec;
1168         int this_length = 0;
1169         /*
1170          * we get the number of bytes allocated on the stream before any
1171          * allocation done by the backend - this should give us a reasonable
1172          * idea of the total size of the data so far.
1173          */
1174         total_length = odr_total(a->encode) - dumped_records;
1175         freq.errcode = 0;
1176         freq.errstring = 0;
1177         freq.basename = 0;
1178         freq.len = 0;
1179         freq.record = 0;
1180         freq.last_in_set = 0;
1181         freq.setname = setname;
1182         freq.surrogate_flag = 0;
1183         freq.number = recno;
1184         freq.comp = comp;
1185         freq.request_format = format;
1186         freq.output_format = 0;
1187         freq.stream = a->encode;
1188         freq.print = a->print;
1189         freq.surrogate_flag = 0;
1190         freq.referenceId = referenceId;
1191         (*a->init->bend_fetch)(a->backend, &freq);
1192         /* backend should be able to signal whether error is system-wide
1193            or only pertaining to current record */
1194         if (freq.errcode)
1195         {
1196             if (!freq.surrogate_flag)
1197             {
1198                 *pres = Z_PRES_FAILURE;
1199                 return diagrec(a, freq.errcode, freq.errstring);
1200             }
1201             reclist->records[reclist->num_records] =
1202                 surrogatediagrec(a, freq.basename, freq.errcode,
1203                                  freq.errstring);
1204             reclist->num_records++;
1205             *next = freq.last_in_set ? 0 : recno + 1;
1206             continue;
1207         }
1208         if (freq.len >= 0)
1209             this_length = freq.len;
1210         else
1211             this_length = odr_total(a->encode) - total_length;
1212         yaz_log(LOG_DEBUG, "  fetched record, len=%d, total=%d",
1213             this_length, total_length);
1214         if (this_length + total_length > a->preferredMessageSize)
1215         {
1216             /* record is small enough, really */
1217             if (this_length <= a->preferredMessageSize)
1218             {
1219                 yaz_log(LOG_DEBUG, "  Dropped last normal-sized record");
1220                 *pres = Z_PRES_PARTIAL_2;
1221                 break;
1222             }
1223             /* record can only be fetched by itself */
1224             if (this_length < a->maximumRecordSize)
1225             {
1226                 yaz_log(LOG_DEBUG, "  Record > prefmsgsz");
1227                 if (toget > 1)
1228                 {
1229                     yaz_log(LOG_DEBUG, "  Dropped it");
1230                     reclist->records[reclist->num_records] =
1231                          surrogatediagrec(a, freq.basename, 16, 0);
1232                     reclist->num_records++;
1233                     *next = freq.last_in_set ? 0 : recno + 1;
1234                     dumped_records += this_length;
1235                     continue;
1236                 }
1237             }
1238             else /* too big entirely */
1239             {
1240                 yaz_log(LOG_DEBUG, "Record > maxrcdsz");
1241                 reclist->records[reclist->num_records] =
1242                     surrogatediagrec(a, freq.basename, 17, 0);
1243                 reclist->num_records++;
1244                 *next = freq.last_in_set ? 0 : recno + 1;
1245                 dumped_records += this_length;
1246                 continue;
1247             }
1248         }
1249
1250         if (!(thisrec = (Z_NamePlusRecord *)
1251               odr_malloc(a->encode, sizeof(*thisrec))))
1252             return 0;
1253         if (!(thisrec->databaseName = (char *)odr_malloc(a->encode,
1254             strlen(freq.basename) + 1)))
1255             return 0;
1256         strcpy(thisrec->databaseName, freq.basename);
1257         thisrec->which = Z_NamePlusRecord_databaseRecord;
1258         thisrec->u.databaseRecord = z_ext_record(a->encode, freq.output_format,
1259                                                  freq.record, freq.len);
1260         if (!thisrec->u.databaseRecord)
1261             return 0;
1262         reclist->records[reclist->num_records] = thisrec;
1263         reclist->num_records++;
1264         *next = freq.last_in_set ? 0 : recno + 1;
1265     }
1266     *num = reclist->num_records;
1267     return records;
1268 }
1269
1270 static Z_APDU *process_searchRequest(association *assoc, request *reqb,
1271     int *fd)
1272 {
1273     Z_SearchRequest *req = reqb->request->u.searchRequest;
1274     bend_search_rr *bsrr =
1275         (bend_search_rr *)nmem_malloc (reqb->request_mem, sizeof(*bsrr));
1276
1277     yaz_log(LOG_LOG, "Got SearchRequest.");
1278     bsrr->fd = fd;
1279     bsrr->request = reqb;
1280     bsrr->association = assoc;
1281     bsrr->referenceId = req->referenceId;
1282     save_referenceId (reqb, bsrr->referenceId);
1283
1284     yaz_log (LOG_LOG, "ResultSet '%s'", req->resultSetName);
1285     if (req->databaseNames)
1286     {
1287         int i;
1288         for (i = 0; i < req->num_databaseNames; i++)
1289             yaz_log (LOG_LOG, "Database '%s'", req->databaseNames[i]);
1290     }
1291     switch (req->query->which)
1292     {
1293     case Z_Query_type_1: case Z_Query_type_101:
1294         log_rpn_query (req->query->u.type_1);
1295     }
1296     if (assoc->init->bend_search)
1297     {
1298         bsrr->setname = req->resultSetName;
1299         bsrr->replace_set = *req->replaceIndicator;
1300         bsrr->num_bases = req->num_databaseNames;
1301         bsrr->basenames = req->databaseNames;
1302         bsrr->query = req->query;
1303         bsrr->stream = assoc->encode;
1304         bsrr->decode = assoc->decode;
1305         bsrr->print = assoc->print;
1306         bsrr->errcode = 0;
1307         bsrr->hits = 0;
1308         bsrr->errstring = NULL;
1309         (assoc->init->bend_search)(assoc->backend, bsrr);
1310         if (!bsrr->request)
1311             return 0;
1312     }
1313 #if 0
1314     else
1315     {
1316         bend_searchrequest bsrq;
1317         bend_searchresult *bsrt;
1318
1319         bsrq.setname = req->resultSetName;
1320         bsrq.replace_set = *req->replaceIndicator;
1321         bsrq.num_bases = req->num_databaseNames;
1322         bsrq.basenames = req->databaseNames;
1323         bsrq.query = req->query;
1324         bsrq.referenceId = req->referenceId;
1325         bsrq.stream = assoc->encode;
1326         bsrq.decode = assoc->decode;
1327         bsrq.print = assoc->print;
1328         if (!(bsrt = bend_search (assoc->backend, &bsrq, fd)))
1329             return 0;
1330         bsrr->hits = bsrt->hits;
1331         bsrr->errcode = bsrt->errcode;
1332         bsrr->errstring = bsrt->errstring;
1333     }
1334 #endif
1335     return response_searchRequest(assoc, reqb, bsrr, fd);
1336 }
1337
1338 int bend_searchresponse(void *handle, bend_search_rr *bsrr) {return 0;}
1339
1340 /*
1341  * Prepare a searchresponse based on the backend results. We probably want
1342  * to look at making the fetching of records nonblocking as well, but
1343  * so far, we'll keep things simple.
1344  * If bsrt is null, that means we're called in response to a communications
1345  * event, and we'll have to get the response for ourselves.
1346  */
1347 static Z_APDU *response_searchRequest(association *assoc, request *reqb,
1348     bend_search_rr *bsrt, int *fd)
1349 {
1350     Z_SearchRequest *req = reqb->request->u.searchRequest;
1351     Z_APDU *apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1352     Z_SearchResponse *resp = (Z_SearchResponse *)
1353         odr_malloc (assoc->encode, sizeof(*resp));
1354     int *nulint = (int *)odr_malloc (assoc->encode, sizeof(*nulint));
1355     bool_t *sr = (bool_t *)odr_malloc (assoc->encode, sizeof(*sr));
1356     int *next = (int *)odr_malloc (assoc->encode, sizeof(*next));
1357     int *none = (int *)odr_malloc (assoc->encode, sizeof(*none));
1358
1359     *nulint = 0;
1360     *sr = 1;
1361     *next = 0;
1362     *none = Z_RES_NONE;
1363
1364     apdu->which = Z_APDU_searchResponse;
1365     apdu->u.searchResponse = resp;
1366     resp->referenceId = req->referenceId;
1367     resp->additionalSearchInfo = 0;
1368     resp->otherInfo = 0;
1369     *fd = -1;
1370     if (!bsrt && !bend_searchresponse(assoc->backend, bsrt))
1371     {
1372         yaz_log(LOG_FATAL, "Bad result from backend");
1373         return 0;
1374     }
1375     else if (bsrt->errcode)
1376     {
1377         resp->records = diagrec(assoc, bsrt->errcode, bsrt->errstring);
1378         resp->resultCount = nulint;
1379         resp->numberOfRecordsReturned = nulint;
1380         resp->nextResultSetPosition = nulint;
1381         resp->searchStatus = nulint;
1382         resp->resultSetStatus = none;
1383         resp->presentStatus = 0;
1384     }
1385     else
1386     {
1387         int *toget = (int *)odr_malloc (assoc->encode, sizeof(*toget));
1388         int *presst = (int *)odr_malloc (assoc->encode, sizeof(*presst));
1389         Z_RecordComposition comp, *compp = 0;
1390
1391         *toget = 0;
1392         *presst = 0;
1393         resp->records = 0;
1394         resp->resultCount = &bsrt->hits;
1395
1396         comp.which = Z_RecordComp_simple;
1397         /* how many records does the user agent want, then? */
1398         if (bsrt->hits <= *req->smallSetUpperBound)
1399         {
1400             *toget = bsrt->hits;
1401             if ((comp.u.simple = req->smallSetElementSetNames))
1402                 compp = &comp;
1403         }
1404         else if (bsrt->hits < *req->largeSetLowerBound)
1405         {
1406             *toget = *req->mediumSetPresentNumber;
1407             if (*toget > bsrt->hits)
1408                 *toget = bsrt->hits;
1409             if ((comp.u.simple = req->mediumSetElementSetNames))
1410                 compp = &comp;
1411         }
1412         else
1413             *toget = 0;
1414
1415         if (*toget && !resp->records)
1416         {
1417             oident *prefformat;
1418             oid_value form;
1419
1420             if (!(prefformat = oid_getentbyoid(req->preferredRecordSyntax)) ||
1421                 prefformat->oclass != CLASS_RECSYN)
1422                 form = VAL_NONE;
1423             else
1424                 form = prefformat->value;
1425             resp->records = pack_records(assoc, req->resultSetName, 1,
1426                 toget, compp, next, presst, form, req->referenceId);
1427             if (!resp->records)
1428                 return 0;
1429             resp->numberOfRecordsReturned = toget;
1430             resp->nextResultSetPosition = next;
1431             resp->searchStatus = sr;
1432             resp->resultSetStatus = 0;
1433             resp->presentStatus = presst;
1434         }
1435         else
1436         {
1437             if (*resp->resultCount)
1438                 *next = 1;
1439             resp->numberOfRecordsReturned = nulint;
1440             resp->nextResultSetPosition = next;
1441             resp->searchStatus = sr;
1442             resp->resultSetStatus = 0;
1443             resp->presentStatus = 0;
1444         }
1445     }
1446     return apdu;
1447 }
1448
1449 /*
1450  * Maybe we got a little over-friendly when we designed bend_fetch to
1451  * get only one record at a time. Some backends can optimise multiple-record
1452  * fetches, and at any rate, there is some overhead involved in
1453  * all that selecting and hopping around. Problem is, of course, that the
1454  * frontend can't know ahead of time how many records it'll need to
1455  * fill the negotiated PDU size. Annoying. Segmentation or not, Z/SR
1456  * is downright lousy as a bulk data transfer protocol.
1457  *
1458  * To start with, we'll do the fetching of records from the backend
1459  * in one operation: To save some trips in and out of the event-handler,
1460  * and to simplify the interface to pack_records. At any rate, asynch
1461  * operation is more fun in operations that have an unpredictable execution
1462  * speed - which is normally more true for search than for present.
1463  */
1464 static Z_APDU *process_presentRequest(association *assoc, request *reqb,
1465     int *fd)
1466 {
1467     Z_PresentRequest *req = reqb->request->u.presentRequest;
1468     oident *prefformat;
1469     oid_value form;
1470     Z_APDU *apdu;
1471     Z_PresentResponse *resp;
1472     int *presst;
1473     int *next;
1474     int *num;
1475
1476     yaz_log(LOG_LOG, "Got PresentRequest.");
1477
1478     if (!(prefformat = oid_getentbyoid(req->preferredRecordSyntax)) ||
1479         prefformat->oclass != CLASS_RECSYN)
1480         form = VAL_NONE;
1481     else
1482         form = prefformat->value;
1483     if (assoc->init->bend_present)
1484     {
1485         bend_present_rr *bprr = (bend_present_rr *)
1486             nmem_malloc (reqb->request_mem, sizeof(*bprr));
1487         bprr->setname = req->resultSetId;
1488         bprr->start = *req->resultSetStartPoint;
1489         bprr->number = *req->numberOfRecordsRequested;
1490         bprr->format = form;
1491         bprr->comp = req->recordComposition;
1492         bprr->referenceId = req->referenceId;
1493         bprr->stream = assoc->encode;
1494         bprr->print = assoc->print;
1495         bprr->request = reqb;
1496         bprr->association = assoc;
1497         bprr->errcode = 0;
1498         bprr->errstring = NULL;
1499         (*assoc->init->bend_present)(assoc->backend, bprr);
1500
1501         if (!bprr->request)
1502             return 0;
1503     }
1504     apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1505     resp = (Z_PresentResponse *)odr_malloc (assoc->encode, sizeof(*resp));
1506     presst = (int *)odr_malloc (assoc->encode, sizeof(*presst));
1507     next = (int *)odr_malloc (assoc->encode, sizeof(*next));
1508     num = (int *)odr_malloc (assoc->encode, sizeof(*num));
1509     *presst = 0;
1510     *next = 0;
1511     *num = *req->numberOfRecordsRequested;
1512
1513     apdu->which = Z_APDU_presentResponse;
1514     apdu->u.presentResponse = resp;
1515     resp->referenceId = req->referenceId;
1516     resp->otherInfo = 0;
1517
1518     resp->records =
1519         pack_records(assoc, req->resultSetId, *req->resultSetStartPoint,
1520                      num, req->recordComposition, next, presst, form,
1521                      req->referenceId);
1522     if (!resp->records)
1523         return 0;
1524     resp->numberOfRecordsReturned = num;
1525     resp->presentStatus = presst;
1526     resp->nextResultSetPosition = next;
1527
1528     return apdu;
1529 }
1530
1531 #if 0
1532 static int bend_default_scan (void *handle, bend_scan_rr *rr)
1533 {
1534     bend_scanrequest srq;
1535     bend_scanresult *srs;
1536
1537     srq.num_bases = rr->num_bases;
1538     srq.basenames = rr->basenames;
1539     srq.attributeset = rr->attributeset;
1540     srq.referenceId = rr->referenceId;
1541     srq.term = rr->term;
1542     srq.term_position = rr->term_position;
1543     srq.num_entries = rr->num_entries;
1544     srq.stream = rr->stream;
1545     srq.print = rr->print;
1546
1547     srs = bend_scan(handle, &srq, 0);
1548
1549     rr->term_position = srs->term_position;
1550     rr->num_entries = srs->num_entries;
1551     rr->entries = srs->entries;
1552     rr->status = srs->status;
1553     rr->errcode = srs->errcode;
1554     rr->errstring = srs->errstring;
1555     return 0;
1556 }
1557 #endif
1558
1559 /*
1560  * Scan was implemented rather in a hurry, and with support for only the basic
1561  * elements of the service in the backend API. Suggestions are welcome.
1562  */
1563 static Z_APDU *process_scanRequest(association *assoc, request *reqb, int *fd)
1564 {
1565     Z_ScanRequest *req = reqb->request->u.scanRequest;
1566     Z_APDU *apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1567     Z_ScanResponse *res = (Z_ScanResponse *)
1568         odr_malloc (assoc->encode, sizeof(*res));
1569     int *scanStatus = (int *)
1570         odr_malloc (assoc->encode, sizeof(*scanStatus));
1571     int *numberOfEntriesReturned = (int *)
1572         odr_malloc (assoc->encode, sizeof(*numberOfEntriesReturned));
1573     Z_ListEntries *ents = (Z_ListEntries *)
1574         odr_malloc (assoc->encode, sizeof(*ents));
1575     Z_DiagRecs *diagrecs_p = NULL;
1576     oident *attent;
1577     oident *attset;
1578
1579     yaz_log(LOG_LOG, "Got ScanRequest");
1580     *scanStatus = Z_Scan_failure;
1581     *numberOfEntriesReturned = 0;
1582
1583     apdu->which = Z_APDU_scanResponse;
1584     apdu->u.scanResponse = res;
1585     res->referenceId = req->referenceId;
1586     res->stepSize = 0;
1587     res->scanStatus = scanStatus;
1588     res->numberOfEntriesReturned = numberOfEntriesReturned;
1589     res->positionOfTerm = 0;
1590     res->entries = ents;
1591     ents->num_entries = 0;
1592     ents->entries = NULL;
1593     ents->num_nonsurrogateDiagnostics = 0;
1594     ents->nonsurrogateDiagnostics = NULL;
1595     res->attributeSet = 0;
1596     res->otherInfo = 0;
1597
1598     if (req->attributeSet && (!(attent = oid_getentbyoid(req->attributeSet)) ||
1599                               attent->oclass != CLASS_ATTSET
1600                               || attent->value != VAL_BIB1))
1601         diagrecs_p = diagrecs(assoc, 121, 0);
1602     else if (req->stepSize && *req->stepSize > 0)
1603         diagrecs_p = diagrecs(assoc, 205, 0);
1604     else
1605     {
1606         bend_scan_rr *bsrr = (bend_scan_rr *)
1607             odr_malloc (assoc->encode, sizeof(*bsrr));
1608         if (req->databaseNames)
1609         {
1610             int i;
1611             for (i = 0; i < req->num_databaseNames; i++)
1612                 yaz_log (LOG_LOG, "Database '%s'", req->databaseNames[i]);
1613         }
1614         bsrr->num_bases = req->num_databaseNames;
1615         bsrr->basenames = req->databaseNames;
1616         bsrr->num_entries = *req->numberOfTermsRequested;
1617         bsrr->term = req->termListAndStartPoint;
1618         bsrr->referenceId = req->referenceId;
1619         bsrr->stream = assoc->encode;
1620         bsrr->print = assoc->print;
1621         if (!(attset = oid_getentbyoid(req->attributeSet)) ||
1622             attset->oclass != CLASS_RECSYN)
1623             bsrr->attributeset = VAL_NONE;
1624         else
1625             bsrr->attributeset = attset->value;
1626         log_scan_term (req->termListAndStartPoint, attset->value);
1627         bsrr->term_position = req->preferredPositionInResponse ?
1628             *req->preferredPositionInResponse : 1;
1629         ((int (*)(void *, bend_scan_rr *))
1630          (*assoc->init->bend_scan))(assoc->backend, bsrr);
1631         if (bsrr->errcode)
1632             diagrecs_p = diagrecs(assoc, bsrr->errcode, bsrr->errstring);
1633         else
1634         {
1635             int i;
1636             Z_Entry **tab = (Z_Entry **)
1637                 odr_malloc (assoc->encode, sizeof(*tab) * bsrr->num_entries);
1638
1639             if (bsrr->status == BEND_SCAN_PARTIAL)
1640                 *scanStatus = Z_Scan_partial_5;
1641             else
1642                 *scanStatus = Z_Scan_success;
1643             ents->entries = tab;
1644             ents->num_entries = bsrr->num_entries;
1645             res->numberOfEntriesReturned = &ents->num_entries;
1646             res->positionOfTerm = &bsrr->term_position;
1647             for (i = 0; i < bsrr->num_entries; i++)
1648             {
1649                 Z_Entry *e;
1650                 Z_TermInfo *t;
1651                 Odr_oct *o;
1652
1653                 tab[i] = e = (Z_Entry *)odr_malloc(assoc->encode, sizeof(*e));
1654                 if (bsrr->entries[i].occurrences >= 0)
1655                 {
1656                     e->which = Z_Entry_termInfo;
1657                     e->u.termInfo = t = (Z_TermInfo *)
1658                         odr_malloc(assoc->encode, sizeof(*t));
1659                     t->suggestedAttributes = 0;
1660                     t->displayTerm = 0;
1661                     t->alternativeTerm = 0;
1662                     t->byAttributes = 0;
1663                     t->otherTermInfo = 0;
1664                     t->globalOccurrences = &bsrr->entries[i].occurrences;
1665                     t->term = (Z_Term *)
1666                         odr_malloc(assoc->encode, sizeof(*t->term));
1667                     t->term->which = Z_Term_general;
1668                     t->term->u.general = o =
1669                         (Odr_oct *)odr_malloc(assoc->encode, sizeof(Odr_oct));
1670                     o->buf = (unsigned char *)
1671                         odr_malloc(assoc->encode, o->len = o->size =
1672                                    strlen(bsrr->entries[i].term));
1673                     memcpy(o->buf, bsrr->entries[i].term, o->len);
1674                     yaz_log(LOG_DEBUG, "  term #%d: '%s' (%d)", i,
1675                          bsrr->entries[i].term, bsrr->entries[i].occurrences);
1676                 }
1677                 else
1678                 {
1679                     Z_DiagRecs *drecs = diagrecs (assoc,
1680                                                   bsrr->entries[i].errcode,
1681                                                   bsrr->entries[i].errstring);
1682                     assert (drecs->num_diagRecs == 1);
1683                     e->which = Z_Entry_surrogateDiagnostic;
1684                     assert (drecs->diagRecs[0]);
1685                     e->u.surrogateDiagnostic = drecs->diagRecs[0];
1686                 }
1687             }
1688         }
1689     }
1690     if (diagrecs_p)
1691     {
1692         ents->num_nonsurrogateDiagnostics = diagrecs_p->num_diagRecs;
1693         ents->nonsurrogateDiagnostics = diagrecs_p->diagRecs;
1694     }
1695     return apdu;
1696 }
1697
1698 static Z_APDU *process_sortRequest(association *assoc, request *reqb,
1699     int *fd)
1700 {
1701     Z_SortRequest *req = reqb->request->u.sortRequest;
1702     Z_SortResponse *res = (Z_SortResponse *)
1703         odr_malloc (assoc->encode, sizeof(*res));
1704     bend_sort_rr *bsrr = (bend_sort_rr *)
1705         odr_malloc (assoc->encode, sizeof(*bsrr));
1706
1707     Z_APDU *apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1708
1709     yaz_log(LOG_LOG, "Got SortRequest.");
1710
1711 #ifdef ASN_COMPILED
1712     bsrr->num_input_setnames = req->num_inputResultSetNames;
1713     bsrr->input_setnames = req->inputResultSetNames;
1714 #else
1715     bsrr->num_input_setnames = req->inputResultSetNames->num_strings;
1716     bsrr->input_setnames = req->inputResultSetNames->strings;
1717 #endif
1718     bsrr->referenceId = req->referenceId;
1719     bsrr->output_setname = req->sortedResultSetName;
1720     bsrr->sort_sequence = req->sortSequence;
1721     bsrr->stream = assoc->encode;
1722     bsrr->print = assoc->print;
1723
1724     bsrr->sort_status = Z_SortStatus_failure;
1725     bsrr->errcode = 0;
1726     bsrr->errstring = 0;
1727
1728     (*assoc->init->bend_sort)(assoc->backend, bsrr);
1729
1730     res->referenceId = bsrr->referenceId;
1731     res->sortStatus = (int *)
1732         odr_malloc (assoc->encode, sizeof(*res->sortStatus));
1733     *res->sortStatus = bsrr->sort_status;
1734     res->resultSetStatus = 0;
1735     if (bsrr->errcode)
1736     {
1737         Z_DiagRecs *dr = diagrecs (assoc, bsrr->errcode, bsrr->errstring);
1738 #ifdef ASN_COMPILED
1739         res->diagnostics = dr->diagRecs;
1740         res->num_diagnostics = dr->num_diagRecs;
1741 #else
1742         res->diagnostics = dr;
1743 #endif
1744     }
1745     else
1746     {
1747 #ifdef ASN_COMPILED
1748         res->num_diagnostics = 0;
1749 #endif
1750         res->diagnostics = 0;
1751     }
1752     res->otherInfo = 0;
1753
1754     apdu->which = Z_APDU_sortResponse;
1755     apdu->u.sortResponse = res;
1756     return apdu;
1757 }
1758
1759 static Z_APDU *process_deleteRequest(association *assoc, request *reqb,
1760     int *fd)
1761 {
1762     Z_DeleteResultSetRequest *req = reqb->request->u.deleteResultSetRequest;
1763     Z_DeleteResultSetResponse *res = (Z_DeleteResultSetResponse *)
1764         odr_malloc (assoc->encode, sizeof(*res));
1765     bend_delete_rr *bdrr = (bend_delete_rr *)
1766         odr_malloc (assoc->encode, sizeof(*bdrr));
1767     Z_APDU *apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1768
1769     yaz_log(LOG_LOG, "Got DeleteRequest.");
1770
1771     bdrr->num_setnames = req->num_resultSetList;
1772     bdrr->setnames = req->resultSetList;
1773     bdrr->stream = assoc->encode;
1774     bdrr->print = assoc->print;
1775     bdrr->function = *req->deleteFunction;
1776     bdrr->referenceId = req->referenceId;
1777     bdrr->statuses = 0;
1778     if (bdrr->num_setnames > 0)
1779     {
1780         int i;
1781         bdrr->statuses = odr_malloc(assoc->encode, sizeof(*bdrr->statuses) *
1782                                     bdrr->num_setnames);
1783         for (i = 0; i < bdrr->num_setnames; i++)
1784             bdrr->statuses[i] = 0;
1785     }
1786     (*assoc->init->bend_delete)(assoc->backend, bdrr);
1787
1788     res->referenceId = req->referenceId;
1789
1790     res->deleteOperationStatus = (int *)
1791         odr_malloc (assoc->encode, sizeof(*res->deleteOperationStatus));
1792     *res->deleteOperationStatus = bdrr->delete_status;
1793
1794     res->deleteListStatuses = 0;
1795     if (bdrr->num_setnames > 0)
1796     {
1797         int i;
1798         res->deleteListStatuses = odr_malloc(assoc->encode,
1799                                              sizeof(*res->deleteListStatuses));
1800         res->deleteListStatuses->num = bdrr->num_setnames;
1801         res->deleteListStatuses->elements =
1802             odr_malloc (assoc->encode,
1803                         sizeof(*res->deleteListStatuses->elements) *
1804                         bdrr->num_setnames);
1805         for (i = 0; i<bdrr->num_setnames; i++)
1806         {
1807             res->deleteListStatuses->elements[i] =
1808                 odr_malloc (assoc->encode,
1809                             sizeof(**res->deleteListStatuses->elements));
1810             res->deleteListStatuses->elements[i]->status = bdrr->statuses+i;
1811             res->deleteListStatuses->elements[i]->id =
1812                 odr_strdup (assoc->encode, bdrr->setnames[i]);
1813
1814         }
1815     }
1816     res->numberNotDeleted = 0;
1817     res->bulkStatuses = 0;
1818     res->deleteMessage = 0;
1819     res->otherInfo = 0;
1820
1821     apdu->which = Z_APDU_deleteResultSetResponse;
1822     apdu->u.deleteResultSetResponse = res;
1823     return apdu;
1824 }
1825
1826 static void process_close(association *assoc, request *reqb)
1827 {
1828     Z_Close *req = reqb->request->u.close;
1829     static char *reasons[] =
1830     {
1831         "finished",
1832         "shutdown",
1833         "systemProblem",
1834         "costLimit",
1835         "resources",
1836         "securityViolation",
1837         "protocolError",
1838         "lackOfActivity",
1839         "peerAbort",
1840         "unspecified"
1841     };
1842
1843     yaz_log(LOG_LOG, "Got Close, reason %s, message %s",
1844         reasons[*req->closeReason], req->diagnosticInformation ?
1845         req->diagnosticInformation : "NULL");
1846     if (assoc->version < 3) /* to make do_force respond with close */
1847         assoc->version = 3;
1848     do_close_req(assoc, Z_Close_finished,
1849                  "Association terminated by client", reqb);
1850 }
1851
1852 void save_referenceId (request *reqb, Z_ReferenceId *refid)
1853 {
1854     if (refid)
1855     {
1856         reqb->len_refid = refid->len;
1857         reqb->refid = (char *)nmem_malloc (reqb->request_mem, refid->len);
1858         memcpy (reqb->refid, refid->buf, refid->len);
1859     }
1860     else
1861     {
1862         reqb->len_refid = 0;
1863         reqb->refid = NULL;
1864     }
1865 }
1866
1867 void bend_request_send (bend_association a, bend_request req, Z_APDU *res)
1868 {
1869     process_response (a, req, res);
1870 }
1871
1872 bend_request bend_request_mk (bend_association a)
1873 {
1874     request *nreq = request_get (&a->outgoing);
1875     nreq->request_mem = nmem_create ();
1876     return nreq;
1877 }
1878
1879 Z_ReferenceId *bend_request_getid (ODR odr, bend_request req)
1880 {
1881     Z_ReferenceId *id;
1882     if (!req->refid)
1883         return 0;
1884     id = (Odr_oct *)odr_malloc (odr, sizeof(*odr));
1885     id->buf = (unsigned char *)odr_malloc (odr, req->len_refid);
1886     id->len = id->size = req->len_refid;
1887     memcpy (id->buf, req->refid, req->len_refid);
1888     return id;
1889 }
1890
1891 void bend_request_destroy (bend_request *req)
1892 {
1893     nmem_destroy((*req)->request_mem);
1894     request_release(*req);
1895     *req = NULL;
1896 }
1897
1898 int bend_backend_respond (bend_association a, bend_request req)
1899 {
1900     char *msg;
1901     int r;
1902     r = process_request (a, req, &msg);
1903     if (r < 0)
1904         logf (LOG_WARN, "%s", msg);
1905     return r;
1906 }
1907
1908 void bend_request_setdata(bend_request r, void *p)
1909 {
1910     r->clientData = p;
1911 }
1912
1913 void *bend_request_getdata(bend_request r)
1914 {
1915     return r->clientData;
1916 }
1917
1918 static Z_APDU *process_segmentRequest (association *assoc, request *reqb)
1919 {
1920     bend_segment_rr request;
1921
1922     request.segment = reqb->request->u.segmentRequest;
1923     request.stream = assoc->encode;
1924     request.decode = assoc->decode;
1925     request.print = assoc->print;
1926     request.association = assoc;
1927
1928     (*assoc->init->bend_segment)(assoc->backend, &request);
1929
1930     return 0;
1931 }
1932
1933 static Z_APDU *process_ESRequest(association *assoc, request *reqb, int *fd)
1934 {
1935     bend_esrequest_rr esrequest;
1936
1937     Z_ExtendedServicesRequest *req = reqb->request->u.extendedServicesRequest;
1938     Z_APDU *apdu = zget_APDU(assoc->encode, Z_APDU_extendedServicesResponse);
1939
1940     Z_ExtendedServicesResponse *resp = apdu->u.extendedServicesResponse;
1941
1942     yaz_log(LOG_DEBUG,"inside Process esRequest");
1943
1944     esrequest.esr = reqb->request->u.extendedServicesRequest;
1945     esrequest.stream = assoc->encode;
1946     esrequest.decode = assoc->decode;
1947     esrequest.print = assoc->print;
1948     esrequest.errcode = 0;
1949     esrequest.errstring = NULL;
1950     esrequest.request = reqb;
1951     esrequest.association = assoc;
1952     esrequest.referenceId = req->referenceId;
1953
1954     (*assoc->init->bend_esrequest)(assoc->backend, &esrequest);
1955
1956     /* If the response is being delayed, return NULL */
1957     if (esrequest.request == NULL)
1958         return(NULL);
1959
1960     resp->referenceId = req->referenceId;
1961
1962     if (esrequest.errcode == -1)
1963     {
1964         /* Backend service indicates request will be processed */
1965         yaz_log(LOG_DEBUG,"Request could be processed...Accepted !");
1966         *resp->operationStatus = Z_ExtendedServicesResponse_accepted;
1967     }
1968     else if (esrequest.errcode == 0)
1969     {
1970         /* Backend service indicates request will be processed */
1971         yaz_log(LOG_DEBUG,"Request could be processed...Done !");
1972         *resp->operationStatus = Z_ExtendedServicesResponse_done;
1973     }
1974     else
1975     {
1976         Z_DiagRecs *diagRecs = diagrecs (assoc, esrequest.errcode,
1977                                          esrequest.errstring);
1978
1979         /* Backend indicates error, request will not be processed */
1980         yaz_log(LOG_DEBUG,"Request could not be processed...failure !");
1981         *resp->operationStatus = Z_ExtendedServicesResponse_failure;
1982         resp->num_diagnostics = diagRecs->num_diagRecs;
1983         resp->diagnostics = diagRecs->diagRecs;
1984     }
1985     /* Do something with the members of bend_extendedservice */
1986
1987     yaz_log(LOG_DEBUG,"Send the result apdu");
1988     return apdu;
1989 }