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