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