server/seshigh.c

   1 /*
   2  * Copyright (c) 1995-1998, Index Data
   3  * See the file LICENSE for details.
   4  * Sebastian Hammer, Adam Dickmeiss
   5  *
   6  * $Log: seshigh.c,v $
   7  * Revision 1.79  1998-08-19 16:10:08  adam
   8  * Changed som member names of DeleteResultSetRequest/Response.
   9  *
  10  * Revision 1.78  1998/08/03 10:23:55  adam
  11  * Fixed bug regarding Options for Sort.
  12  *
  13  * Revision 1.77  1998/07/20 12:38:42  adam
  14  * Implemented delete result set service to server API.
  15  *
  16  * Revision 1.76  1998/05/27 16:57:07  adam
  17  * Support for surrogate diagnostic records added for bend_fetch.
  18  *
  19  * Revision 1.75  1998/05/18 10:13:07  adam
  20  * Fixed call to es_request handler - extra argument was passed.
  21  *
  22  * Revision 1.74  1998/03/31 15:13:20  adam
  23  * Development towards compiled ASN.1.
  24  *
  25  * Revision 1.73  1998/03/31 11:07:45  adam
  26  * Furhter work on UNIverse resource report.
  27  * Added Extended Services handling in frontend server.
  28  *
  29  * Revision 1.72  1998/02/11 11:53:35  adam
  30  * Changed code so that it compiles as C++.
  31  *
  32  * Revision 1.71  1998/02/10 11:03:57  adam
  33  * Added support for extended handlers in backend server interface.
  34  *
  35  * Revision 1.70  1998/01/29 13:15:35  adam
  36  * Implemented sort for the backend interface.
  37  *
  38  * Revision 1.69  1997/09/30 11:48:12  adam
  39  * Fixed bug introduced by previous commit.
  40  *
  41  * Revision 1.68  1997/09/29 13:18:59  adam
  42  * Added function, oid_ent_to_oid, to replace the function
  43  * oid_getoidbyent, which is not thread safe.
  44  *
  45  * Revision 1.67  1997/09/17 12:10:40  adam
  46  * YAZ version 1.4.
  47  *
  48  * Revision 1.66  1997/09/05 15:26:44  adam
  49  * Added ODR encode in search and scen bend request structures.
  50  * Fixed a few enums that caused trouble with C++.
  51  *
  52  * Revision 1.65  1997/09/01 08:53:01  adam
  53  * New windows NT/95 port using MSV5.0. The test server 'ztest' was
  54  * moved a separate directory. MSV5.0 project server.dsp created.
  55  * As an option, the server can now operate as an NT service.
  56  *
  57  * Revision 1.64  1997/04/30 08:52:11  quinn
  58  * Null
  59  *
  60  * Revision 1.63  1996/10/11  11:57:26  quinn
  61  * Smallish
  62  *
  63  * Revision 1.62  1996/07/06  19:58:35  quinn
  64  * System headerfiles gathered in yconfig
  65  *
  66  * Revision 1.61  1996/06/10  08:56:16  quinn
  67  * Work on Summary.
  68  *
  69  * Revision 1.60  1996/05/30  11:03:10  quinn
  70  * Fixed NextresultSetPosition bug fixed.
  71  *
  72  * Revision 1.59  1996/05/14  09:26:46  quinn
  73  * Added attribute set to scan backend
  74  *
  75  * Revision 1.58  1996/02/20  12:53:04  quinn
  76  * Chanes to SCAN
  77  *
  78  * Revision 1.57  1996/01/02  08:57:47  quinn
  79  * Changed enums in the ASN.1 .h files to #defines. Changed oident.class to oclass
  80  *
  81  * Revision 1.56  1995/12/14  11:09:57  quinn
  82  * Work on Explain
  83  *
  84  * Revision 1.55  1995/11/08  17:41:37  quinn
  85  * Smallish.
  86  *
  87  * Revision 1.54  1995/11/08  15:11:29  quinn
  88  * Log of close transmit.
  89  *
  90  * Revision 1.53  1995/11/01  13:54:58  quinn
  91  * Minor adjustments
  92  *
  93  * Revision 1.52  1995/11/01  12:19:13  quinn
  94  * Second attempt to fix same bug.
  95  *
  96  * Revision 1.50  1995/10/25  16:58:32  quinn
  97  * Simple.
  98  *
  99  * Revision 1.49  1995/10/16  13:51:53  quinn
 100  * Changes to provide Especs to the backend.
 101  *
 102  * Revision 1.48  1995/10/06  08:51:20  quinn
 103  * Added Write-buffer.
 104  *
 105  * Revision 1.47  1995/08/29  14:24:16  quinn
 106  * Added second half of close-handshake
 107  *
 108  * Revision 1.46  1995/08/29  11:17:58  quinn
 109  * Added code to receive close
 110  *
 111  * Revision 1.45  1995/08/21  09:11:00  quinn
 112  * Smallish fixes to suppport new formats.
 113  *
 114  * Revision 1.44  1995/08/17  12:45:25  quinn
 115  * Fixed minor problems with GRS-1. Added support in c&s.
 116  *
 117  * Revision 1.43  1995/08/15  12:00:31  quinn
 118  * Updated External
 119  *
 120  * Revision 1.42  1995/08/15  11:16:50  quinn
 121  *
 122  * Revision 1.41  1995/08/02  10:23:06  quinn
 123  * Smallish
 124  *
 125  * Revision 1.40  1995/07/31  14:34:26  quinn
 126  * Fixed bug in process_searchResponse (numberOfRecordsReturned).
 127  *
 128  * Revision 1.39  1995/06/27  13:21:00  quinn
 129  * SUTRS support
 130  *
 131  * Revision 1.38  1995/06/19  12:39:11  quinn
 132  * Fixed bug in timeout code. Added BER dumper.
 133  *
 134  * Revision 1.37  1995/06/16  13:16:14  quinn
 135  * Fixed Defaultdiagformat.
 136  *
 137  * Revision 1.36  1995/06/16  10:31:36  quinn
 138  * Added session timeout.
 139  *
 140  * Revision 1.35  1995/06/15  07:45:14  quinn
 141  * Moving to v3.
 142  *
 143  * Revision 1.34  1995/06/14  15:26:46  quinn
 144  * *** empty log message ***
 145  *
 146  * Revision 1.33  1995/06/06  14:57:05  quinn
 147  * Better diagnostics.
 148  *
 149  * Revision 1.32  1995/06/06  08:41:44  quinn
 150  * Better diagnostics.
 151  *
 152  * Revision 1.31  1995/06/06  08:15:37  quinn
 153  * Cosmetic.
 154  *
 155  * Revision 1.30  1995/06/05  10:53:32  quinn
 156  * Added a better SCAN.
 157  *
 158  * Revision 1.29  1995/06/01  11:25:03  quinn
 159  * Smallish.
 160  *
 161  * Revision 1.28  1995/06/01  11:21:01  quinn
 162  * Attempting to fix a bug in pack-records. replaced break with continue
 163  * for large records, according to standard.
 164  *
 165  * Revision 1.27  1995/05/29  08:12:06  quinn
 166  * Moved oid to util
 167  *
 168  * Revision 1.26  1995/05/18  13:02:12  quinn
 169  * Smallish.
 170  *
 171  * Revision 1.25  1995/05/17  08:42:26  quinn
 172  * Transfer auth info to backend. Allow backend to reject init gracefully.
 173  *
 174  * Revision 1.24  1995/05/16  08:51:04  quinn
 175  * License, documentation, and memory fixes
 176  *
 177  * Revision 1.23  1995/05/15  13:25:10  quinn
 178  * Fixed memory bug.
 179  *
 180  * Revision 1.22  1995/05/15  11:56:39  quinn
 181  * Asynchronous facilities. Restructuring of seshigh code.
 182  *
 183  * Revision 1.21  1995/05/02  08:53:19  quinn
 184  * Trying in vain to fix comm with ISODE
 185  *
 186  * Revision 1.20  1995/04/20  15:13:00  quinn
 187  * Cosmetic
 188  *
 189  * Revision 1.19  1995/04/18  08:15:34  quinn
 190  * Added dynamic memory allocation on encoding (whew). Code is now somewhat
 191  * neater. We'll make the same change for decoding one day.
 192  *
 193  * Revision 1.18  1995/04/17  11:28:25  quinn
 194  * Smallish
 195  *
 196  * Revision 1.17  1995/04/10  10:23:36  quinn
 197  * Some work to add scan and other things.
 198  *
 199  * Revision 1.16  1995/03/31  09:18:55  quinn
 200  * Added logging.
 201  *
 202  * Revision 1.15  1995/03/30  14:03:23  quinn
 203  * Added RFC1006 as separate library
 204  *
 205  * Revision 1.14  1995/03/30  12:18:17  quinn
 206  * Fixed bug.
 207  *
 208  * Revision 1.13  1995/03/30  09:09:24  quinn
 209  * Added state-handle and some support for asynchronous activities.
 210  *
 211  * Revision 1.12  1995/03/29  15:40:16  quinn
 212  * Ongoing work. Statserv is now dynamic by default
 213  *
 214  * Revision 1.11  1995/03/28  09:16:21  quinn
 215  * Added record packing to the search request
 216  *
 217  * Revision 1.10  1995/03/27  08:34:24  quinn
 218  * Added dynamic server functionality.
 219  * Released bindings to session.c (is now redundant)
 220  *
 221  * Revision 1.9  1995/03/22  15:01:26  quinn
 222  * Adjusting record packing.
 223  *
 224  * Revision 1.8  1995/03/22  10:13:21  quinn
 225  * Working on record packer
 226  *
 227  * Revision 1.7  1995/03/21  15:53:31  quinn
 228  * Little changes.
 229  *
 230  * Revision 1.6  1995/03/21  12:30:09  quinn
 231  * Beginning to add support for record packing.
 232  *
 233  * Revision 1.5  1995/03/17  10:44:13  quinn
 234  * Added catch of null-string in makediagrec
 235  *
 236  * Revision 1.4  1995/03/17  10:18:08  quinn
 237  * Added memory management.
 238  *
 239  * Revision 1.3  1995/03/16  17:42:39  quinn
 240  * Little changes
 241  *
 242  * Revision 1.2  1995/03/16  13:29:01  quinn
 243  * Partitioned server.
 244  *
 245  * Revision 1.1  1995/03/15  16:02:10  quinn
 246  * Modded session.c to seshigh.c
 247  *
 248  */
 249
 250 /*
 251  * Frontend server logic.
 252  *
 253  * This code receives incoming APDUs, and handles client requests by means
 254  * of the backend API.
 255  *
 256  * Some of the code is getting quite involved, compared to simpler servers -
 257  * primarily because it is asynchronous both in the communication with
 258  * the user and the backend. We think the complexity will pay off in
 259  * the form of greater flexibility when more asynchronous facilities
 260  * are implemented.
 261  *
 262  * Memory management has become somewhat involved. In the simple case, where
 263  * only one PDU is pending at a time, it will simply reuse the same memory,
 264  * once it has found its working size. When we enable multiple concurrent
 265  * operations, perhaps even with multiple parallel calls to the backend, it
 266  * will maintain a pool of buffers for encoding and decoding, trying to
 267  * minimize memory allocation/deallocation during normal operation.
 268  *
 269  * TODOs include (and will be done in order of public interest):
 270  *
 271  * Support for EXPLAIN - provide simple meta-database system.
 272  * Support for access control.
 273  * Support for resource control.
 274  * Support for extended services - primarily Item Order.
 275  * Rest of Z39.50-1994
 276  *
 277  */
 278
 279 #include <yconfig.h>
 280 #include <stdlib.h>
 281 #include <stdio.h>
 282 #ifdef WINDOWS
 283 #include <process.h>
 284 #else
 285 #include <unistd.h>
 286 #endif
 287 #include <assert.h>
 288
 289 #include <xmalloc.h>
 290 #include <comstack.h>
 291 #include "eventl.h"
 292 #include "session.h"
 293 #include <proto.h>
 294 #include <oid.h>
 295 #include <log.h>
 296 #include <statserv.h>
 297
 298 #include <backend.h>
 299
 300 static int process_request(association *assoc, request *req);
 301 void backend_response(IOCHAN i, int event);
 302 static int process_response(association *assoc, request *req, Z_APDU *res);
 303 static Z_APDU *process_initRequest(association *assoc, request *reqb);
 304 static Z_APDU *process_searchRequest(association *assoc, request *reqb,
 305     int *fd);
 306 static Z_APDU *response_searchRequest(association *assoc, request *reqb,
 307     bend_search_rr *bsrr, int *fd);
 308 static Z_APDU *process_presentRequest(association *assoc, request *reqb,
 309     int *fd);
 310 static Z_APDU *process_scanRequest(association *assoc, request *reqb, int *fd);
 311 static Z_APDU *process_sortRequest(association *assoc, request *reqb, int *fd);
 312 static void process_close(association *assoc, request *reqb);
 313 void save_referenceId (request *reqb, Z_ReferenceId *refid);
 314 static Z_APDU *process_deleteRequest(association *assoc, request *reqb,
 315     int *fd);
 316
 317 static FILE *apduf = 0; /* for use in static mode */
 318 static statserv_options_block *control_block = 0;
 319
 320 /* Chas: Added in from DALI */
 321 static Z_APDU *process_ESRequest(association *assoc, request *reqb, int *fd);
 322 /* Chas: End of addition from DALI */
 323
 324 /*
 325  * Create and initialize a new association-handle.
 326  *  channel  : iochannel for the current line.
 327  *  link     : communications channel.
 328  * Returns: 0 or a new association handle.
 329  */
 330 association *create_association(IOCHAN channel, COMSTACK link)
 331 {
 332     association *anew;
 333
 334     if (!control_block)
 335         control_block = statserv_getcontrol();
 336     if (!(anew = (association *)xmalloc(sizeof(*anew))))
 337         return 0;
 338     anew->client_chan = channel;
 339     anew->client_link = link;
 340     if (!(anew->decode = odr_createmem(ODR_DECODE)) ||
 341         !(anew->encode = odr_createmem(ODR_ENCODE)))
 342         return 0;
 343     if (*control_block->apdufile)
 344     {
 345         char filename[256];
 346         FILE *f;
 347
 348         strcpy(filename, control_block->apdufile);
 349         if (!(anew->print = odr_createmem(ODR_PRINT)))
 350             return 0;
 351         if (*control_block->apdufile != '-')
 352         {
 353             strcpy(filename, control_block->apdufile);
 354             if (!control_block->dynamic)
 355             {
 356                 if (!apduf)
 357                 {
 358                     if (!(apduf = fopen(filename, "w")))
 359                     {
 360                         logf(LOG_WARN|LOG_ERRNO, "%s", filename);
 361                         return 0;
 362                     }
 363                     setvbuf(apduf, 0, _IONBF, 0);
 364                 }
 365                 f = apduf;
 366             }
 367             else
 368             {
 369                 sprintf(filename + strlen(filename), ".%d", getpid());
 370                 if (!(f = fopen(filename, "w")))
 371                 {
 372                     logf(LOG_WARN|LOG_ERRNO, "%s", filename);
 373                     return 0;
 374                 }
 375                 setvbuf(f, 0, _IONBF, 0);
 376             }
 377             odr_setprint(anew->print, f);
 378         }
 379     }
 380     else
 381         anew->print = 0;
 382     anew->input_buffer = 0;
 383     anew->input_buffer_len = 0;
 384     anew->backend = 0;
 385     anew->state = ASSOC_NEW;
 386     request_initq(&anew->incoming);
 387     request_initq(&anew->outgoing);
 388     anew->proto = cs_getproto(link);
 389     return anew;
 390 }
 391
 392 /*
 393  * Free association and release resources.
 394  */
 395 void destroy_association(association *h)
 396 {
 397     odr_destroy(h->decode);
 398     odr_destroy(h->encode);
 399     if (h->print)
 400         odr_destroy(h->print);
 401     if (h->input_buffer)
 402     xfree(h->input_buffer);
 403     if (h->backend)
 404         bend_close(h->backend);
 405     while (request_deq(&h->incoming));
 406     while (request_deq(&h->outgoing));
 407     request_delq(&h->incoming);
 408     request_delq(&h->outgoing);
 409     xfree(h);
 410 }
 411
 412 static void do_close_req(association *a, int reason, char *message,
 413                          request *req)
 414 {
 415     Z_APDU apdu;
 416     Z_Close *cls = zget_Close(a->encode);
 417
 418     /* Purge request queue */
 419     while (request_deq(&a->incoming));
 420     while (request_deq(&a->outgoing));
 421     if (a->version >= 3)
 422     {
 423         logf(LOG_LOG, "Sending Close PDU, reason=%d, message=%s",
 424             reason, message ? message : "none");
 425         apdu.which = Z_APDU_close;
 426         apdu.u.close = cls;
 427         *cls->closeReason = reason;
 428         cls->diagnosticInformation = message;
 429         process_response(a, req, &apdu);
 430         iochan_settimeout(a->client_chan, 60);
 431     }
 432     else
 433     {
 434         logf(LOG_DEBUG, "v2 client. No Close PDU");
 435         iochan_setevent(a->client_chan, EVENT_TIMEOUT); /* force imm close */
 436     }
 437     a->state = ASSOC_DEAD;
 438 }
 439
 440 static void do_close(association *a, int reason, char *message)
 441 {
 442     do_close_req (a, reason, message, request_get(&a->outgoing));
 443 }
 444
 445 /*
 446  * This is where PDUs from the client are read and the further
 447  * processing is initiated. Flow of control moves down through the
 448  * various process_* functions below, until the encoded result comes back up
 449  * to the output handler in here.
 450  *
 451  *  h     : the I/O channel that has an outstanding event.
 452  *  event : the current outstanding event.
 453  */
 454 void ir_session(IOCHAN h, int event)
 455 {
 456     int res;
 457     association *assoc = (association *)iochan_getdata(h);
 458     COMSTACK conn = assoc->client_link;
 459     request *req;
 460
 461     assert(h && conn && assoc);
 462     if (event == EVENT_TIMEOUT)
 463     {
 464         if (assoc->state != ASSOC_UP)
 465         {
 466             logf(LOG_LOG, "Final timeout - closing connection.");
 467             cs_close(conn);
 468             destroy_association(assoc);
 469             iochan_destroy(h);
 470         }
 471         else
 472         {
 473             logf(LOG_LOG, "Session idle too long. Sending close.");
 474             do_close(assoc, Z_Close_lackOfActivity, 0);
 475         }
 476         return;
 477     }
 478     if (event & EVENT_INPUT || event & EVENT_WORK) /* input */
 479     {
 480         if (event & EVENT_INPUT)
 481         {
 482             logf(LOG_DEBUG, "ir_session (input)");
 483             assert(assoc && conn);
 484             /* We aren't speaking to this fellow */
 485             if (assoc->state == ASSOC_DEAD)
 486             {
 487                 logf(LOG_LOG, "Closed connection after reject");
 488                 cs_close(conn);
 489                 destroy_association(assoc);
 490                 iochan_destroy(h);
 491                 return;
 492             }
 493             if ((res = cs_get(conn, &assoc->input_buffer,
 494                 &assoc->input_buffer_len)) <= 0)
 495             {
 496                 logf(LOG_LOG, "Connection closed by client");
 497                 cs_close(conn);
 498                 destroy_association(assoc);
 499                 iochan_destroy(h);
 500                 return;
 501             }
 502             else if (res == 1) /* incomplete read - wait for more  */
 503                 return;
 504             if (cs_more(conn)) /* more stuff - call us again later, please */
 505                 iochan_setevent(h, EVENT_INPUT);
 506
 507             /* we got a complete PDU. Let's decode it */
 508             logf(LOG_DEBUG, "Got PDU, %d bytes", res);
 509             req = request_get(&assoc->incoming); /* get a new request structure */
 510             odr_reset(assoc->decode);
 511             odr_setbuf(assoc->decode, assoc->input_buffer, res, 0);
 512             if (!z_APDU(assoc->decode, &req->request, 0))
 513             {
 514                 logf(LOG_LOG, "ODR error on incoming PDU: %s [near byte %d] ",
 515                     odr_errmsg(odr_geterror(assoc->decode)),
 516                     odr_offset(assoc->decode));
 517                 logf(LOG_LOG, "PDU dump:");
 518                 odr_dumpBER(log_file(), assoc->input_buffer, res);
 519                 do_close(assoc, Z_Close_protocolError, "Malformed package");
 520                 return;
 521             }
 522             req->request_mem = odr_extract_mem(assoc->decode);
 523             if (assoc->print && !z_APDU(assoc->print, &req->request, 0))
 524             {
 525                 logf(LOG_WARN, "ODR print error: %s",
 526                     odr_errmsg(odr_geterror(assoc->print)));
 527                 odr_reset(assoc->print);
 528             }
 529             request_enq(&assoc->incoming, req);
 530         }
 531
 532         /* can we do something yet? */
 533         req = request_head(&assoc->incoming);
 534         if (req->state == REQUEST_IDLE)
 535         {
 536             request_deq(&assoc->incoming);
 537             if (process_request(assoc, req) < 0)
 538                 do_close_req(assoc, Z_Close_systemProblem, "Unknown error",
 539                              req);
 540         }
 541     }
 542     if (event & EVENT_OUTPUT)
 543     {
 544         request *req = request_head(&assoc->outgoing);
 545
 546         logf(LOG_DEBUG, "ir_session (output)");
 547         req->state = REQUEST_PENDING;
 548         switch (res = cs_put(conn, req->response, req->len_response))
 549         {
 550             case -1:
 551                 logf(LOG_LOG, "Connection closed by client");
 552                 cs_close(conn);
 553                 destroy_association(assoc);
 554                 iochan_destroy(h);
 555                 break;
 556             case 0: /* all sent - release the request structure */
 557                 logf(LOG_DEBUG, "Wrote PDU, %d bytes", req->len_response);
 558                 nmem_destroy(req->request_mem);
 559                 request_deq(&assoc->outgoing);
 560                 request_release(req);
 561                 if (!request_head(&assoc->outgoing))
 562                     iochan_clearflag(h, EVENT_OUTPUT);
 563                 break;
 564             /* value of 1 -- partial send -- is simply ignored */
 565         }
 566     }
 567     if (event & EVENT_EXCEPT)
 568     {
 569         logf(LOG_DEBUG, "ir_session (exception)");
 570         cs_close(conn);
 571         destroy_association(assoc);
 572         iochan_destroy(h);
 573     }
 574 }
 575
 576 /*
 577  * Initiate request processing.
 578  */
 579 static int process_request(association *assoc, request *req)
 580 {
 581     int fd = -1;
 582     Z_APDU *res;
 583     int retval;
 584
 585     assert(req && req->state == REQUEST_IDLE);
 586     switch (req->request->which)
 587     {
 588         case Z_APDU_initRequest:
 589             res = process_initRequest(assoc, req); break;
 590         case Z_APDU_searchRequest:
 591             res = process_searchRequest(assoc, req, &fd); break;
 592         case Z_APDU_presentRequest:
 593             res = process_presentRequest(assoc, req, &fd); break;
 594         case Z_APDU_scanRequest:
 595             res = process_scanRequest(assoc, req, &fd); break;
 596         case Z_APDU_extendedServicesRequest:
 597             if (assoc->bend_esrequest)
 598                 res = process_ESRequest(assoc, req, &fd);
 599             else
 600             {
 601                 logf(LOG_WARN, "Cannot handle EXTENDED SERVICES APDU");
 602                 return -1;
 603             }
 604             break;
 605         case Z_APDU_sortRequest:
 606             if (assoc->bend_sort)
 607                 res = process_sortRequest(assoc, req, &fd);
 608             else
 609             {
 610                 logf(LOG_WARN, "Cannot handle SORT APDU");
 611                 return -1;
 612             }
 613             break;
 614         case Z_APDU_close:
 615             process_close(assoc, req); return 0;
 616         case Z_APDU_deleteResultSetRequest:
 617             if (assoc->bend_delete)
 618                 res = process_deleteRequest(assoc, req, &fd);
 619             else
 620             {
 621                 logf (LOG_WARN, "Cannot handle Delete APDU");
 622                 return -1;
 623             }
 624             break;
 625         default:
 626             logf(LOG_WARN, "Bad APDU received");
 627             return -1;
 628     }
 629     if (res)
 630     {
 631         logf(LOG_DEBUG, "  result immediately available");
 632         retval = process_response(assoc, req, res);
 633     }
 634     else if (fd < 0)
 635     {
 636         logf(LOG_DEBUG, "  result unavailble");
 637         retval = 0;
 638     }
 639     else /* no result yet - one will be provided later */
 640     {
 641         IOCHAN chan;
 642
 643         /* Set up an I/O handler for the fd supplied by the backend */
 644
 645         logf(LOG_DEBUG, "   establishing handler for result");
 646         req->state = REQUEST_PENDING;
 647         if (!(chan = iochan_create(fd, backend_response, EVENT_INPUT)))
 648             abort();
 649         iochan_setdata(chan, assoc);
 650         retval = 0;
 651     }
 652     return retval;
 653 }
 654
 655 /*
 656  * Handle message from the backend.
 657  */
 658 void backend_response(IOCHAN i, int event)
 659 {
 660     association *assoc = (association *)iochan_getdata(i);
 661     request *req = request_head(&assoc->incoming);
 662     Z_APDU *res;
 663     int fd;
 664
 665     logf(LOG_DEBUG, "backend_response");
 666     assert(assoc && req && req->state != REQUEST_IDLE);
 667     /* determine what it is we're waiting for */
 668     switch (req->request->which)
 669     {
 670         case Z_APDU_searchRequest:
 671             res = response_searchRequest(assoc, req, 0, &fd); break;
 672 #if 0
 673         case Z_APDU_presentRequest:
 674             res = response_presentRequest(assoc, req, 0, &fd); break;
 675         case Z_APDU_scanRequest:
 676             res = response_scanRequest(assoc, req, 0, &fd); break;
 677 #endif
 678         default:
 679             logf(LOG_WARN, "Serious programmer's lapse or bug");
 680             abort();
 681     }
 682     if ((res && process_response(assoc, req, res) < 0) || fd < 0)
 683     {
 684         logf(LOG_LOG, "Fatal error when talking to backend");
 685         do_close(assoc, Z_Close_systemProblem, 0);
 686         iochan_destroy(i);
 687         return;
 688     }
 689     else if (!res) /* no result yet - try again later */
 690     {
 691         logf(LOG_DEBUG, "   no result yet");
 692         iochan_setfd(i, fd); /* in case fd has changed */
 693     }
 694 }
 695
 696 /*
 697  * Encode response, and transfer the request structure to the outgoing queue.
 698  */
 699 static int process_response(association *assoc, request *req, Z_APDU *res)
 700 {
 701     odr_setbuf(assoc->encode, req->response, req->size_response, 1);
 702     if (!z_APDU(assoc->encode, &res, 0))
 703     {
 704         logf(LOG_WARN, "ODR error when encoding response: %s",
 705             odr_errmsg(odr_geterror(assoc->decode)));
 706         odr_reset(assoc->encode);
 707         return -1;
 708     }
 709     req->response = odr_getbuf(assoc->encode, &req->len_response,
 710         &req->size_response);
 711     odr_setbuf(assoc->encode, 0, 0, 0); /* don'txfree if we abort later */
 712     if (assoc->print && !z_APDU(assoc->print, &res, 0))
 713     {
 714         logf(LOG_WARN, "ODR print error: %s",
 715             odr_errmsg(odr_geterror(assoc->print)));
 716         odr_reset(assoc->print);
 717     }
 718     odr_reset(assoc->encode);
 719     req->state = REQUEST_IDLE;
 720     request_enq(&assoc->outgoing, req);
 721     /* turn the work over to the ir_session handler */
 722     iochan_setflag(assoc->client_chan, EVENT_OUTPUT);
 723     /* Is there more work to be done? give that to the input handler too */
 724 #if 1
 725     if (request_head(&assoc->incoming))
 726     {
 727         logf (LOG_DEBUG, "more work to be done");
 728         iochan_setevent(assoc->client_chan, EVENT_WORK);
 729     }
 730 #endif
 731     return 0;
 732 }
 733
 734 /*
 735  * Handle init request.
 736  * At the moment, we don't check the options
 737  * anywhere else in the code - we just try not to do anything that would
 738  * break a naive client. We'll toss 'em into the association block when
 739  * we need them there.
 740  */
 741 static Z_APDU *process_initRequest(association *assoc, request *reqb)
 742 {
 743     Z_InitRequest *req = reqb->request->u.initRequest;
 744     Z_APDU *apdu = zget_APDU(assoc->encode, Z_APDU_initResponse);
 745     Z_InitResponse *resp = apdu->u.initResponse;
 746     bend_initrequest binitreq;
 747     bend_initresult *binitres;
 748     char options[100];
 749
 750     logf(LOG_LOG, "Got initRequest");
 751     if (req->implementationId)
 752         logf(LOG_LOG, "Id:        %s", req->implementationId);
 753     if (req->implementationName)
 754         logf(LOG_LOG, "Name:      %s", req->implementationName);
 755     if (req->implementationVersion)
 756         logf(LOG_LOG, "Version:   %s", req->implementationVersion);
 757
 758     binitreq.stream = assoc->encode;
 759     binitreq.configname = "default-config";
 760     binitreq.auth = req->idAuthentication;
 761     binitreq.bend_sort = NULL;
 762     binitreq.bend_search = NULL;
 763     binitreq.bend_present = NULL;
 764     binitreq.bend_esrequest = NULL;
 765     binitreq.bend_delete = NULL;
 766     if (!(binitres = bend_init(&binitreq)))
 767     {
 768         logf(LOG_WARN, "Bad response from backend.");
 769         return 0;
 770     }
 771
 772     assoc->backend = binitres->handle;
 773     if ((assoc->bend_sort = (int (*)())binitreq.bend_sort))
 774         logf (LOG_DEBUG, "Sort handler installed");
 775     if ((assoc->bend_search = (int (*)())binitreq.bend_search))
 776         logf (LOG_DEBUG, "Search handler installed");
 777     if ((assoc->bend_present = (int (*)())binitreq.bend_present))
 778         logf (LOG_DEBUG, "Present handler installed");
 779     if ((assoc->bend_esrequest = (int (*)())binitreq.bend_esrequest))
 780         logf (LOG_DEBUG, "ESRequest handler installed");
 781     if ((assoc->bend_delete = (int (*)())binitreq.bend_delete))
 782         logf (LOG_DEBUG, "Delete handler installed");
 783
 784     resp->referenceId = req->referenceId;
 785     *options = '\0';
 786     /* let's tell the client what we can do */
 787     if (ODR_MASK_GET(req->options, Z_Options_search))
 788     {
 789         ODR_MASK_SET(resp->options, Z_Options_search);
 790         strcat(options, "srch");
 791     }
 792     if (ODR_MASK_GET(req->options, Z_Options_present))
 793     {
 794         ODR_MASK_SET(resp->options, Z_Options_present);
 795         strcat(options, " prst");
 796     }
 797     if (ODR_MASK_GET(req->options, Z_Options_delSet) && binitreq.bend_delete)
 798     {
 799         ODR_MASK_SET(resp->options, Z_Options_delSet);
 800         strcat(options, " del");
 801     }
 802     if (ODR_MASK_GET(req->options, Z_Options_extendedServices) &&
 803         binitreq.bend_esrequest)
 804     {
 805         ODR_MASK_SET(resp->options, Z_Options_extendedServices);
 806         strcat (options, " extendedServices");
 807     }
 808     if (ODR_MASK_GET(req->options, Z_Options_namedResultSets))
 809     {
 810         ODR_MASK_SET(resp->options, Z_Options_namedResultSets);
 811         strcat(options, " namedresults");
 812     }
 813     if (ODR_MASK_GET(req->options, Z_Options_scan))
 814     {
 815         ODR_MASK_SET(resp->options, Z_Options_scan);
 816         strcat(options, " scan");
 817     }
 818     if (ODR_MASK_GET(req->options, Z_Options_concurrentOperations))
 819     {
 820         ODR_MASK_SET(resp->options, Z_Options_concurrentOperations);
 821         strcat(options, " concurop");
 822     }
 823     if (ODR_MASK_GET(req->options, Z_Options_sort) && binitreq.bend_sort)
 824     {
 825         ODR_MASK_SET(resp->options, Z_Options_sort);
 826         strcat(options, " sort");
 827     }
 828     if (ODR_MASK_GET(req->protocolVersion, Z_ProtocolVersion_1))
 829     {
 830         ODR_MASK_SET(resp->protocolVersion, Z_ProtocolVersion_1);
 831         assoc->version = 2; /* 1 & 2 are equivalent */
 832     }
 833     if (ODR_MASK_GET(req->protocolVersion, Z_ProtocolVersion_2))
 834     {
 835         ODR_MASK_SET(resp->protocolVersion, Z_ProtocolVersion_2);
 836         assoc->version = 2;
 837     }
 838     if (ODR_MASK_GET(req->protocolVersion, Z_ProtocolVersion_3))
 839     {
 840         ODR_MASK_SET(resp->protocolVersion, Z_ProtocolVersion_3);
 841         assoc->version = 3;
 842     }
 843     logf(LOG_LOG, "Negotiated to v%d: %s", assoc->version, options);
 844     assoc->maximumRecordSize = *req->maximumRecordSize;
 845     if (assoc->maximumRecordSize > control_block->maxrecordsize)
 846         assoc->maximumRecordSize = control_block->maxrecordsize;
 847     assoc->preferredMessageSize = *req->preferredMessageSize;
 848     if (assoc->preferredMessageSize > assoc->maximumRecordSize)
 849         assoc->preferredMessageSize = assoc->maximumRecordSize;
 850     resp->preferredMessageSize = &assoc->preferredMessageSize;
 851     resp->maximumRecordSize = &assoc->maximumRecordSize;
 852     resp->implementationName = "Index Data/YAZ Generic Frontend Server";
 853     if (binitres->errcode)
 854     {
 855         logf(LOG_LOG, "Connection rejected by backend.");
 856         *resp->result = 0;
 857         assoc->state = ASSOC_DEAD;
 858     }
 859     else
 860         assoc->state = ASSOC_UP;
 861     return apdu;
 862 }
 863
 864 /*
 865  * These functions should be merged.
 866  */
 867
 868 static void set_addinfo (Z_DefaultDiagFormat *dr, char *addinfo)
 869 {
 870 #if ASN_COMPILED
 871     dr->which = Z_DefaultDiagFormat_v2Addinfo;
 872     dr->u.v2Addinfo = addinfo ? addinfo : "";
 873 #else
 874     dr->which = Z_DiagForm_v2AddInfo;
 875     dr->addinfo = addinfo ? addinfo : "";
 876 #endif
 877 }
 878
 879 /*
 880  * nonsurrogate diagnostic record.
 881  */
 882 static Z_Records *diagrec(association *assoc, int error, char *addinfo)
 883 {
 884     int oid[OID_SIZE];
 885     Z_Records *rec = (Z_Records *)odr_malloc (assoc->encode, sizeof(*rec));
 886     oident bib1;
 887     int *err = (int *)odr_malloc (assoc->encode, sizeof(*err));
 888     Z_DiagRec *drec = (Z_DiagRec *)odr_malloc (assoc->encode, sizeof(*drec));
 889     Z_DefaultDiagFormat *dr = (Z_DefaultDiagFormat *)odr_malloc (assoc->encode, sizeof(*dr));
 890
 891     bib1.proto = assoc->proto;
 892     bib1.oclass = CLASS_DIAGSET;
 893     bib1.value = VAL_BIB1;
 894
 895     logf(LOG_DEBUG, "Diagnostic: %d -- %s", error, addinfo ? addinfo :
 896         "NULL");
 897     *err = error;
 898     rec->which = Z_Records_NSD;
 899 #if ASN_COMPILED
 900     rec->u.nonSurrogateDiagnostic = dr;
 901 #else
 902 #ifdef Z_95
 903     rec->u.nonSurrogateDiagnostic = drec;
 904     drec->which = Z_DiagRec_defaultFormat;
 905     drec->u.defaultFormat = dr;
 906 #else
 907     rec->u.nonSurrogateDiagnostic = dr;
 908 #endif
 909 #endif
 910     dr->diagnosticSetId = odr_oiddup (assoc->encode,
 911                                       oid_ent_to_oid(&bib1, oid));
 912     dr->condition = err;
 913     set_addinfo (dr, addinfo);
 914     return rec;
 915 }
 916
 917 /*
 918  * surrogate diagnostic.
 919  */
 920 static Z_NamePlusRecord *surrogatediagrec(association *assoc, char *dbname,
 921                                           int error, char *addinfo)
 922 {
 923     int oid[OID_SIZE];
 924     Z_NamePlusRecord *rec = (Z_NamePlusRecord *)odr_malloc (assoc->encode, sizeof(*rec));
 925     int *err = (int *)odr_malloc (assoc->encode, sizeof(*err));
 926     oident bib1;
 927     Z_DiagRec *drec = (Z_DiagRec *)odr_malloc (assoc->encode, sizeof(*drec));
 928     Z_DefaultDiagFormat *dr = (Z_DefaultDiagFormat *)odr_malloc (assoc->encode, sizeof(*dr));
 929
 930     bib1.proto = assoc->proto;
 931     bib1.oclass = CLASS_DIAGSET;
 932     bib1.value = VAL_BIB1;
 933
 934     logf(LOG_DEBUG, "SurrogateDiagnotic: %d -- %s", error, addinfo);
 935     *err = error;
 936     rec->databaseName = dbname;
 937     rec->which = Z_NamePlusRecord_surrogateDiagnostic;
 938     rec->u.surrogateDiagnostic = drec;
 939     drec->which = Z_DiagRec_defaultFormat;
 940     drec->u.defaultFormat = dr;
 941     dr->diagnosticSetId = odr_oiddup (assoc->encode,
 942                                       oid_ent_to_oid(&bib1, oid));
 943     dr->condition = err;
 944     set_addinfo (dr, addinfo);
 945
 946     return rec;
 947 }
 948
 949 /*
 950  * multiple nonsurrogate diagnostics.
 951  */
 952 static Z_DiagRecs *diagrecs(association *assoc, int error, char *addinfo)
 953 {
 954     int oid[OID_SIZE];
 955     Z_DiagRecs *recs = (Z_DiagRecs *)odr_malloc (assoc->encode, sizeof(*recs));
 956     int *err = (int *)odr_malloc (assoc->encode, sizeof(*err));
 957     oident bib1;
 958     Z_DiagRec **recp = (Z_DiagRec **)odr_malloc (assoc->encode, sizeof(*recp));
 959     Z_DiagRec *drec = (Z_DiagRec *)odr_malloc (assoc->encode, sizeof(*drec));
 960     Z_DefaultDiagFormat *rec = (Z_DefaultDiagFormat *)odr_malloc (assoc->encode, sizeof(*rec));
 961
 962     logf(LOG_DEBUG, "DiagRecs: %d -- %s", error, addinfo);
 963     bib1.proto = assoc->proto;
 964     bib1.oclass = CLASS_DIAGSET;
 965     bib1.value = VAL_BIB1;
 966
 967     *err = error;
 968     recs->num_diagRecs = 1;
 969     recs->diagRecs = recp;
 970     recp[0] = drec;
 971     drec->which = Z_DiagRec_defaultFormat;
 972     drec->u.defaultFormat = rec;
 973
 974     rec->diagnosticSetId = odr_oiddup (assoc->encode,
 975                                       oid_ent_to_oid(&bib1, oid));
 976     rec->condition = err;
 977
 978 #ifdef ASN_COMPILED
 979     rec->which = Z_DefaultDiagFormat_v2Addinfo;
 980     rec->u.v2Addinfo = addinfo ? addinfo : "";
 981 #else
 982     rec->which = Z_DiagForm_v2AddInfo;
 983     rec->addinfo = addinfo ? addinfo : "";
 984 #endif
 985     return recs;
 986 }
 987
 988 static Z_Records *pack_records(association *a, char *setname, int start,
 989                                 int *num, Z_RecordComposition *comp,
 990                                 int *next, int *pres, oid_value format)
 991 {
 992     int oid[OID_SIZE];
 993     int recno, total_length = 0, toget = *num, dumped_records = 0;
 994     Z_Records *records = (Z_Records *)odr_malloc (a->encode, sizeof(*records));
 995     Z_NamePlusRecordList *reclist = (Z_NamePlusRecordList *)odr_malloc (a->encode, sizeof(*reclist));
 996     Z_NamePlusRecord **list = (Z_NamePlusRecord **)odr_malloc (a->encode, sizeof(*list) * toget);
 997     oident recform;
 998
 999     records->which = Z_Records_DBOSD;
1000     records->u.databaseOrSurDiagnostics = reclist;
1001     reclist->num_records = 0;
1002     reclist->records = list;
1003     *pres = Z_PRES_SUCCESS;
1004     *num = 0;
1005     *next = 0;
1006
1007     logf(LOG_DEBUG, "Request to pack %d+%d", start, toget);
1008     logf(LOG_DEBUG, "pms=%d, mrs=%d", a->preferredMessageSize,
1009         a->maximumRecordSize);
1010     for (recno = start; reclist->num_records < toget; recno++)
1011     {
1012         bend_fetchrequest freq;
1013         bend_fetchresult *fres;
1014         Z_NamePlusRecord *thisrec;
1015         Z_DatabaseRecord *thisext;
1016         int this_length = 0;
1017
1018         /*
1019          * we get the number of bytes allocated on the stream before any
1020          * allocation done by the backend - this should give us a reasonable
1021          * idea of the total size of the data so far.
1022          */
1023         total_length = odr_total(a->encode) - dumped_records;
1024         freq.setname = setname;
1025         freq.number = recno;
1026         freq.comp = comp;
1027         freq.format = format;
1028         freq.stream = a->encode;
1029         freq.surrogate_flag = 0;
1030         if (!(fres = bend_fetch(a->backend, &freq, 0)))
1031         {
1032             *pres = Z_PRES_FAILURE;
1033             return diagrec(a, 2, "Backend interface problem");
1034         }
1035         /* backend should be able to signal whether error is system-wide
1036            or only pertaining to current record */
1037         if (fres->errcode)
1038         {
1039             if (!freq.surrogate_flag)
1040             {
1041                 *pres = Z_PRES_FAILURE;
1042                 return diagrec(a, fres->errcode, fres->errstring);
1043             }
1044             reclist->records[reclist->num_records] =
1045                 surrogatediagrec(a, fres->basename, fres->errcode,
1046                                  fres->errstring);
1047             reclist->num_records++;
1048             *next = fres->last_in_set ? 0 : recno + 1;
1049             continue;
1050         }
1051         if (fres->len >= 0)
1052             this_length = fres->len;
1053         else
1054             this_length = odr_total(a->encode) - total_length;
1055         logf(LOG_DEBUG, "  fetched record, len=%d, total=%d",
1056             this_length, total_length);
1057         if (this_length + total_length > a->preferredMessageSize)
1058         {
1059             /* record is small enough, really */
1060             if (this_length <= a->preferredMessageSize)
1061             {
1062                 logf(LOG_DEBUG, "  Dropped last normal-sized record");
1063                 *pres = Z_PRES_PARTIAL_2;
1064                 break;
1065             }
1066             /* record can only be fetched by itself */
1067             if (this_length < a->maximumRecordSize)
1068             {
1069                 logf(LOG_DEBUG, "  Record > prefmsgsz");
1070                 if (toget > 1)
1071                 {
1072                     logf(LOG_DEBUG, "  Dropped it");
1073                     reclist->records[reclist->num_records] =
1074                          surrogatediagrec(a, fres->basename, 16, 0);
1075                     reclist->num_records++;
1076                     *next = fres->last_in_set ? 0 : recno + 1;
1077                     dumped_records += this_length;
1078                     continue;
1079                 }
1080             }
1081             else /* too big entirely */
1082             {
1083                 logf(LOG_DEBUG, "Record > maxrcdsz");
1084                 reclist->records[reclist->num_records] =
1085                     surrogatediagrec(a, fres->basename, 17, 0);
1086                 reclist->num_records++;
1087                 *next = fres->last_in_set ? 0 : recno + 1;
1088                 dumped_records += this_length;
1089                 continue;
1090             }
1091         }
1092
1093         if (!(thisrec = (Z_NamePlusRecord *)odr_malloc(a->encode, sizeof(*thisrec))))
1094             return 0;
1095         if (!(thisrec->databaseName = (char *)odr_malloc(a->encode,
1096             strlen(fres->basename) + 1)))
1097             return 0;
1098         strcpy(thisrec->databaseName, fres->basename);
1099         thisrec->which = Z_NamePlusRecord_databaseRecord;
1100         if (!(thisrec->u.databaseRecord = thisext = (Z_External *)odr_malloc(a->encode,
1101             sizeof(Z_DatabaseRecord))))
1102             return 0;
1103         recform.proto = a->proto;
1104         recform.oclass = CLASS_RECSYN;
1105         recform.value = fres->format;
1106         thisext->direct_reference = odr_oiddup(a->encode,
1107                                                oid_ent_to_oid(&recform, oid));
1108         thisext->indirect_reference = 0;
1109         thisext->descriptor = 0;
1110         if (fres->len < 0) /* Structured data */
1111         {
1112             switch (fres->format)
1113             {
1114                 case VAL_SUTRS: thisext->which = Z_External_sutrs; break;
1115                 case VAL_GRS1: thisext->which = Z_External_grs1; break;
1116                 case VAL_EXPLAIN: thisext->which = Z_External_explainRecord;
1117                     break;
1118                 case VAL_SUMMARY: thisext->which = Z_External_summary; break;
1119                 case VAL_OPAC: thisext->which = Z_External_OPAC; break;
1120
1121                 default:
1122                     logf(LOG_FATAL, "Unknown structured format from backend.");
1123                     return 0;
1124             }
1125
1126             /*
1127              * We cheat on the pointers here. Obviously, the record field
1128              * of the backend-fetch structure should have been a union for
1129              * correctness, but we're stuck with this for backwards
1130              * compatibility.
1131              */
1132             thisext->u.grs1 = (Z_GenericRecord*) fres->record;
1133         }
1134         else if (fres->format == VAL_SUTRS) /* SUTRS is a single-ASN.1-type */
1135         {
1136 #if 0
1137             Z_SUTRS *sutrs = (Z_SUTRS *)odr_malloc(a->encode, 1+fres->len);
1138
1139             memcpy(sutrs, fres->record, fres->len);
1140             sutrs[fres->len] = '\0';
1141 #else
1142             Odr_oct *sutrs = (Odr_oct *)odr_malloc(a->encode, sizeof(*sutrs));
1143
1144             thisext->which = Z_External_sutrs;
1145             thisext->u.sutrs = sutrs;
1146             sutrs->buf = (unsigned char *)odr_malloc(a->encode, fres->len);
1147             sutrs->len = sutrs->size = fres->len;
1148             memcpy(sutrs->buf, fres->record, fres->len);
1149 #endif
1150         }
1151         else /* octet-aligned record. */
1152         {
1153             thisext->which = Z_External_octet;
1154             if (!(thisext->u.octet_aligned = (Odr_oct *)odr_malloc(a->encode,
1155                 sizeof(Odr_oct))))
1156                 return 0;
1157             if (!(thisext->u.octet_aligned->buf = (unsigned char *)odr_malloc(a->encode,
1158                 fres->len)))
1159                 return 0;
1160             memcpy(thisext->u.octet_aligned->buf, fres->record, fres->len);
1161             thisext->u.octet_aligned->len = thisext->u.octet_aligned->size =
1162                 fres->len;
1163         }
1164         reclist->records[reclist->num_records] = thisrec;
1165         reclist->num_records++;
1166         *next = fres->last_in_set ? 0 : recno + 1;
1167     }
1168     *num = reclist->num_records;
1169     return records;
1170 }
1171
1172 static Z_APDU *process_searchRequest(association *assoc, request *reqb,
1173     int *fd)
1174 {
1175     Z_SearchRequest *req = reqb->request->u.searchRequest;
1176     bend_search_rr *bsrr = (bend_search_rr *)nmem_malloc (reqb->request_mem, sizeof(*bsrr));
1177
1178     logf(LOG_LOG, "Got SearchRequest.");
1179     save_referenceId (reqb, req->referenceId);
1180     /* store ref id in request */
1181     bsrr->fd = fd;
1182     bsrr->request = reqb;
1183     bsrr->association = assoc;
1184     if (assoc->bend_search)
1185     {
1186         bsrr->setname = req->resultSetName;
1187         bsrr->replace_set = *req->replaceIndicator;
1188         bsrr->num_bases = req->num_databaseNames;
1189         bsrr->basenames = req->databaseNames;
1190         bsrr->query = req->query;
1191         bsrr->stream = assoc->encode;
1192         bsrr->errcode = 0;
1193         bsrr->hits = 0;
1194         bsrr->errstring = NULL;
1195         ((int (*)(void *, bend_search_rr *))(assoc->bend_search))(assoc->backend, bsrr);
1196         if (!bsrr->request)
1197             return 0;
1198     }
1199     else
1200     {
1201         bend_searchrequest bsrq;
1202         bend_searchresult *bsrt;
1203
1204         bsrq.setname = req->resultSetName;
1205         bsrq.replace_set = *req->replaceIndicator;
1206         bsrq.num_bases = req->num_databaseNames;
1207         bsrq.basenames = req->databaseNames;
1208         bsrq.query = req->query;
1209         bsrq.stream = assoc->encode;
1210         if (!(bsrt = bend_search(assoc->backend, &bsrq, fd)))
1211             return 0;
1212         bsrr->hits = bsrt->hits;
1213         bsrr->errcode = bsrt->errcode;
1214         bsrr->errstring = bsrt->errstring;
1215     }
1216     return response_searchRequest(assoc, reqb, bsrr, fd);
1217 }
1218
1219 int bend_searchresponse(void *handle, bend_search_rr *bsrr) {return 0;}
1220
1221 /*
1222  * Prepare a searchresponse based on the backend results. We probably want
1223  * to look at making the fetching of records nonblocking as well, but
1224  * so far, we'll keep things simple.
1225  * If bsrt is null, that means we're called in response to a communications
1226  * event, and we'll have to get the response for ourselves.
1227  */
1228 static Z_APDU *response_searchRequest(association *assoc, request *reqb,
1229     bend_search_rr *bsrt, int *fd)
1230 {
1231     Z_SearchRequest *req = reqb->request->u.searchRequest;
1232     Z_APDU *apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1233     Z_SearchResponse *resp = (Z_SearchResponse *)odr_malloc (assoc->encode, sizeof(*resp));
1234     int *nulint = (int *)odr_malloc (assoc->encode, sizeof(*nulint));
1235     bool_t *sr = (bool_t *)odr_malloc (assoc->encode, sizeof(*sr));
1236     int *next = (int *)odr_malloc (assoc->encode, sizeof(*next));
1237     int *none = (int *)odr_malloc (assoc->encode, sizeof(*none));
1238
1239     *nulint = 0;
1240     *sr = 1;
1241     *next = 0;
1242     *none = Z_RES_NONE;
1243
1244     apdu->which = Z_APDU_searchResponse;
1245     apdu->u.searchResponse = resp;
1246     resp->referenceId = req->referenceId;
1247     resp->additionalSearchInfo = 0;
1248     resp->otherInfo = 0;
1249     *fd = -1;
1250     if (!bsrt && !bend_searchresponse(assoc->backend, bsrt))
1251     {
1252         logf(LOG_FATAL, "Bad result from backend");
1253         return 0;
1254     }
1255     else if (bsrt->errcode)
1256     {
1257         resp->records = diagrec(assoc, bsrt->errcode, bsrt->errstring);
1258         resp->resultCount = nulint;
1259         resp->numberOfRecordsReturned = nulint;
1260         resp->nextResultSetPosition = nulint;
1261         resp->searchStatus = nulint;
1262         resp->resultSetStatus = none;
1263         resp->presentStatus = 0;
1264     }
1265     else
1266     {
1267         int *toget = (int *)odr_malloc (assoc->encode, sizeof(*toget));
1268         int *presst = (int *)odr_malloc (assoc->encode, sizeof(*presst));
1269         Z_RecordComposition comp, *compp = 0;
1270
1271         *toget = 0;
1272         *presst = 0;
1273         resp->records = 0;
1274         resp->resultCount = &bsrt->hits;
1275
1276         comp.which = Z_RecordComp_simple;
1277         /* how many records does the user agent want, then? */
1278         if (bsrt->hits <= *req->smallSetUpperBound)
1279         {
1280             *toget = bsrt->hits;
1281             if ((comp.u.simple = req->smallSetElementSetNames))
1282                 compp = &comp;
1283         }
1284         else if (bsrt->hits < *req->largeSetLowerBound)
1285         {
1286             *toget = *req->mediumSetPresentNumber;
1287             if (*toget > bsrt->hits)
1288                 *toget = bsrt->hits;
1289             if ((comp.u.simple = req->mediumSetElementSetNames))
1290                 compp = &comp;
1291         }
1292         else
1293             *toget = 0;
1294
1295         if (*toget && !resp->records)
1296         {
1297             oident *prefformat;
1298             oid_value form;
1299
1300             if (!(prefformat = oid_getentbyoid(req->preferredRecordSyntax)) ||
1301                 prefformat->oclass != CLASS_RECSYN)
1302                 form = VAL_NONE;
1303             else
1304                 form = prefformat->value;
1305             resp->records = pack_records(assoc, req->resultSetName, 1,
1306                 toget, compp, next, presst, form);
1307             if (!resp->records)
1308                 return 0;
1309             resp->numberOfRecordsReturned = toget;
1310             resp->nextResultSetPosition = next;
1311             resp->searchStatus = sr;
1312             resp->resultSetStatus = 0;
1313             resp->presentStatus = presst;
1314         }
1315         else
1316         {
1317             if (*resp->resultCount)
1318                 *next = 1;
1319             resp->numberOfRecordsReturned = nulint;
1320             resp->nextResultSetPosition = next;
1321             resp->searchStatus = sr;
1322             resp->resultSetStatus = 0;
1323             resp->presentStatus = 0;
1324         }
1325     }
1326     return apdu;
1327 }
1328
1329 /*
1330  * Maybe we got a little over-friendly when we designed bend_fetch to
1331  * get only one record at a time. Some backends can optimise multiple-record
1332  * fetches, and at any rate, there is some overhead involved in
1333  * all that selecting and hopping around. Problem is, of course, that the
1334  * frontend can't know ahead of time how many records it'll need to
1335  * fill the negotiated PDU size. Annoying. Segmentation or not, Z/SR
1336  * is downright lousy as a bulk data transfer protocol.
1337  *
1338  * To start with, we'll do the fetching of records from the backend
1339  * in one operation: To save some trips in and out of the event-handler,
1340  * and to simplify the interface to pack_records. At any rate, asynch
1341  * operation is more fun in operations that have an unpredictable execution
1342  * speed - which is normally more true for search than for present.
1343  */
1344 static Z_APDU *process_presentRequest(association *assoc, request *reqb,
1345     int *fd)
1346 {
1347     Z_PresentRequest *req = reqb->request->u.presentRequest;
1348     oident *prefformat;
1349     oid_value form;
1350     Z_APDU *apdu;
1351     Z_PresentResponse *resp;
1352     int *presst;
1353     int *next;
1354     int *num;
1355
1356     logf(LOG_LOG, "Got PresentRequest.");
1357
1358     if (!(prefformat = oid_getentbyoid(req->preferredRecordSyntax)) ||
1359         prefformat->oclass != CLASS_RECSYN)
1360         form = VAL_NONE;
1361     else
1362         form = prefformat->value;
1363     if (assoc->bend_present)
1364     {
1365         bend_present_rr *bprr = (bend_present_rr *)nmem_malloc (reqb->request_mem, sizeof(*bprr));
1366         bprr->setname = req->resultSetId;
1367         bprr->start = *req->resultSetStartPoint;
1368         bprr->number = *req->numberOfRecordsRequested;
1369         bprr->format = form;
1370         bprr->comp = req->recordComposition;
1371         bprr->stream = assoc->encode;
1372         bprr->request = reqb;
1373         bprr->association = assoc;
1374         bprr->errcode = 0;
1375         bprr->errstring = NULL;
1376         ((int (*)(void *, bend_present_rr *))(*assoc->bend_present))(assoc->backend, bprr);
1377
1378         if (!bprr->request)
1379             return 0;
1380     }
1381     apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1382     resp = (Z_PresentResponse *)odr_malloc (assoc->encode, sizeof(*resp));
1383     presst = (int *)odr_malloc (assoc->encode, sizeof(*presst));
1384     next = (int *)odr_malloc (assoc->encode, sizeof(*next));
1385     num = (int *)odr_malloc (assoc->encode, sizeof(*num));
1386     *presst = 0;
1387     *next = 0;
1388     *num = *req->numberOfRecordsRequested;
1389
1390     apdu->which = Z_APDU_presentResponse;
1391     apdu->u.presentResponse = resp;
1392     resp->referenceId = req->referenceId;
1393     resp->otherInfo = 0;
1394
1395     resp->records =
1396         pack_records(assoc, req->resultSetId, *req->resultSetStartPoint,
1397                      num, req->recordComposition, next, presst, form);
1398     if (!resp->records)
1399         return 0;
1400     resp->numberOfRecordsReturned = num;
1401     resp->presentStatus = presst;
1402     resp->nextResultSetPosition = next;
1403
1404     return apdu;
1405 }
1406
1407 /*
1408  * Scan was implemented rather in a hurry, and with support for only the basic
1409  * elements of the service in the backend API. Suggestions are welcome.
1410  */
1411 static Z_APDU *process_scanRequest(association *assoc, request *reqb, int *fd)
1412 {
1413     Z_ScanRequest *req = reqb->request->u.scanRequest;
1414     Z_APDU *apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1415     Z_ScanResponse *res = (Z_ScanResponse *)odr_malloc (assoc->encode, sizeof(*res));
1416     int *scanStatus = (int *)odr_malloc (assoc->encode, sizeof(*scanStatus));
1417     int *numberOfEntriesReturned =
1418          (int *)odr_malloc (assoc->encode, sizeof(*numberOfEntriesReturned));
1419     Z_ListEntries *ents = (Z_ListEntries *)odr_malloc (assoc->encode, sizeof(*ents));
1420     Z_DiagRecs *diagrecs_p = NULL;
1421     oident *attent;
1422     bend_scanrequest srq;
1423     bend_scanresult *srs;
1424     oident *attset;
1425
1426     logf(LOG_LOG, "Got ScanRequest");
1427     *scanStatus = Z_Scan_failure;
1428     *numberOfEntriesReturned = 0;
1429
1430     apdu->which = Z_APDU_scanResponse;
1431     apdu->u.scanResponse = res;
1432     res->referenceId = req->referenceId;
1433     res->stepSize = 0;
1434     res->scanStatus = scanStatus;
1435     res->numberOfEntriesReturned = numberOfEntriesReturned;
1436     res->positionOfTerm = 0;
1437     res->entries = ents;
1438 #if ASN_COMPILED
1439     ents->num_entries = 0;
1440     ents->entries = NULL;
1441     ents->num_nonsurrogateDiagnostics = 0;
1442     ents->nonsurrogateDiagnostics = NULL;
1443 #else
1444     ents->which = Z_ListEntries_entries;
1445 #endif
1446     res->attributeSet = 0;
1447     res->otherInfo = 0;
1448
1449     if (req->attributeSet && (!(attent = oid_getentbyoid(req->attributeSet)) ||
1450                               attent->oclass != CLASS_ATTSET
1451                               || attent->value != VAL_BIB1))
1452         diagrecs_p = diagrecs(assoc, 121, 0);
1453     else if (req->stepSize && *req->stepSize > 0)
1454         diagrecs_p = diagrecs(assoc, 205, 0);
1455     else
1456     {
1457         if (req->termListAndStartPoint->term->which == Z_Term_general)
1458             logf(LOG_DEBUG, " term: '%.*s'",
1459                  req->termListAndStartPoint->term->u.general->len,
1460                  req->termListAndStartPoint->term->u.general->buf);
1461         srq.num_bases = req->num_databaseNames;
1462         srq.basenames = req->databaseNames;
1463         srq.num_entries = *req->numberOfTermsRequested;
1464         srq.term = req->termListAndStartPoint;
1465         srq.stream = assoc->encode;
1466         if (!(attset = oid_getentbyoid(req->attributeSet)) ||
1467             attset->oclass != CLASS_RECSYN)
1468             srq.attributeset = VAL_NONE;
1469         else
1470             srq.attributeset = attset->value;
1471         srq.term_position = req->preferredPositionInResponse ?
1472             *req->preferredPositionInResponse : 1;
1473         if (!(srs = bend_scan(assoc->backend, &srq, 0)))
1474             diagrecs_p = diagrecs(assoc, 2, 0);
1475         else if (srs->errcode)
1476             diagrecs_p = diagrecs(assoc, srs->errcode, srs->errstring);
1477         else
1478         {
1479             int i;
1480 #ifdef ASN_COMPILED
1481 #else
1482             Z_Entries *list = (Z_Entries *)
1483                 odr_malloc (assoc->encode, sizeof(*list));
1484 #endif
1485             Z_Entry **tab = (Z_Entry **)
1486                 odr_malloc (assoc->encode, sizeof(*tab) * srs->num_entries);
1487
1488             if (srs->status == BEND_SCAN_PARTIAL)
1489                 *scanStatus = Z_Scan_partial_5;
1490             else
1491                 *scanStatus = Z_Scan_success;
1492 #ifdef ASN_COMPILED
1493             ents->entries = tab;
1494             ents->num_entries = srs->num_entries;
1495             res->numberOfEntriesReturned = &ents->num_entries;
1496 #else
1497             ents->u.entries = list;
1498             list->entries = tab;
1499             list->num_entries = srs->num_entries;
1500             res->numberOfEntriesReturned = &list->num_entries;
1501 #endif
1502             res->positionOfTerm = &srs->term_position;
1503             for (i = 0; i < srs->num_entries; i++)
1504             {
1505                 Z_Entry *e;
1506                 Z_TermInfo *t;
1507                 Odr_oct *o;
1508
1509                 tab[i] = e = (Z_Entry *)odr_malloc(assoc->encode, sizeof(*e));
1510                 e->which = Z_Entry_termInfo;
1511                 e->u.termInfo = t = (Z_TermInfo *)odr_malloc(assoc->encode, sizeof(*t));
1512                 t->suggestedAttributes = 0;
1513                 t->displayTerm = 0;
1514                 t->alternativeTerm = 0;
1515                 t->byAttributes = 0;
1516                 t->otherTermInfo = 0;
1517                 t->globalOccurrences = &srs->entries[i].occurrences;
1518                 t->term = (Z_Term *)odr_malloc(assoc->encode, sizeof(*t->term));
1519                 t->term->which = Z_Term_general;
1520                 t->term->u.general = o = (Odr_oct *)odr_malloc(assoc->encode,
1521                     sizeof(Odr_oct));
1522                 o->buf = (unsigned char *)odr_malloc(assoc->encode, o->len = o->size =
1523                     strlen(srs->entries[i].term));
1524                 memcpy(o->buf, srs->entries[i].term, o->len);
1525                 logf(LOG_DEBUG, "  term #%d: '%s' (%d)", i,
1526                     srs->entries[i].term, srs->entries[i].occurrences);
1527             }
1528         }
1529     }
1530     if (diagrecs_p)
1531     {
1532 #ifdef ASN_COMPILED
1533         ents->num_nonsurrogateDiagnostics = diagrecs_p->num_diagRecs;
1534         ents->nonsurrogateDiagnostics = diagrecs_p->diagRecs;
1535 #else
1536         ents->u.nonSurrogateDiagnostics = diagrecs_p;
1537         ents->which = Z_ListEntries_nonSurrogateDiagnostics;
1538 #endif
1539     }
1540     return apdu;
1541 }
1542
1543 static Z_APDU *process_sortRequest(association *assoc, request *reqb,
1544     int *fd)
1545 {
1546     Z_SortRequest *req = reqb->request->u.sortRequest;
1547     Z_SortResponse *res = (Z_SortResponse *)odr_malloc (assoc->encode, sizeof(*res));
1548     bend_sort_rr *bsrr = (bend_sort_rr *)odr_malloc (assoc->encode, sizeof(*bsrr));
1549
1550     Z_APDU *apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1551
1552     logf(LOG_LOG, "Got SortRequest.");
1553
1554 #ifdef ASN_COMPILED
1555     bsrr->num_input_setnames = req->num_inputResultSetNames;
1556     bsrr->input_setnames = req->inputResultSetNames;
1557 #else
1558     bsrr->num_input_setnames = req->inputResultSetNames->num_strings;
1559     bsrr->input_setnames = req->inputResultSetNames->strings;
1560 #endif
1561     bsrr->output_setname = req->sortedResultSetName;
1562     bsrr->sort_sequence = req->sortSequence;
1563     bsrr->stream = assoc->encode;
1564
1565     bsrr->sort_status = Z_SortStatus_failure;
1566     bsrr->errcode = 0;
1567     bsrr->errstring = 0;
1568
1569     ((int (*)(void *, bend_sort_rr *))(*assoc->bend_sort))(assoc->backend, bsrr);
1570
1571     res->referenceId = req->referenceId;
1572     res->sortStatus = (int *)odr_malloc (assoc->encode, sizeof(*res->sortStatus));
1573     *res->sortStatus = bsrr->sort_status;
1574     res->resultSetStatus = 0;
1575     if (bsrr->errcode)
1576     {
1577         Z_DiagRecs *dr = diagrecs (assoc, bsrr->errcode, bsrr->errstring);
1578 #ifdef ASN_COMPILED
1579         res->diagnostics = dr->diagRecs;
1580         res->num_diagnostics = dr->num_diagRecs;
1581 #else
1582         res->diagnostics = dr;
1583 #endif
1584     }
1585     else
1586     {
1587 #ifdef ASN_COMPILED
1588         res->num_diagnostics = 0;
1589 #endif
1590         res->diagnostics = 0;
1591     }
1592     res->otherInfo = 0;
1593
1594     apdu->which = Z_APDU_sortResponse;
1595     apdu->u.sortResponse = res;
1596     return apdu;
1597 }
1598
1599 static Z_APDU *process_deleteRequest(association *assoc, request *reqb,
1600     int *fd)
1601 {
1602     Z_DeleteResultSetRequest *req = reqb->request->u.deleteResultSetRequest;
1603     Z_DeleteResultSetResponse *res = (Z_DeleteResultSetResponse *)
1604         odr_malloc (assoc->encode, sizeof(*res));
1605     bend_delete_rr *bdrr = (bend_delete_rr *)
1606         odr_malloc (assoc->encode, sizeof(*bdrr));
1607     Z_APDU *apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1608
1609     logf(LOG_LOG, "Got DeleteRequest.");
1610
1611     bdrr->num_setnames = req->num_resultSetList;
1612     bdrr->setnames = req->resultSetList;
1613     bdrr->stream = assoc->encode;
1614     bdrr->function = *req->deleteFunction;
1615
1616     ((int (*)(void *, bend_delete_rr *))
1617      (*assoc->bend_delete))(assoc->backend, bdrr);
1618
1619     res->referenceId = req->referenceId;
1620
1621     res->deleteOperationStatus = (int *)
1622         odr_malloc (assoc->encode, sizeof(*res->deleteOperationStatus));
1623     *res->deleteOperationStatus = bdrr->delete_status;
1624
1625     res->deleteListStatuses = 0;
1626     res->numberNotDeleted = 0;
1627     res->bulkStatuses = 0;
1628     res->deleteMessage = 0;
1629     res->otherInfo = 0;
1630
1631     apdu->which = Z_APDU_deleteResultSetResponse;
1632     apdu->u.deleteResultSetResponse = res;
1633     return apdu;
1634 }
1635
1636 static void process_close(association *assoc, request *reqb)
1637 {
1638     Z_Close *req = reqb->request->u.close;
1639     static char *reasons[] =
1640     {
1641         "finished",
1642         "shutdown",
1643         "systemProblem",
1644         "costLimit",
1645         "resources",
1646         "securityViolation",
1647         "protocolError",
1648         "lackOfActivity",
1649         "peerAbort",
1650         "unspecified"
1651     };
1652
1653     logf(LOG_LOG, "Got Close, reason %s, message %s",
1654         reasons[*req->closeReason], req->diagnosticInformation ?
1655         req->diagnosticInformation : "NULL");
1656     if (assoc->version < 3) /* to make do_force respond with close */
1657         assoc->version = 3;
1658     do_close_req(assoc, Z_Close_finished, "Association terminated by client",
1659                  reqb);
1660 }
1661
1662 void save_referenceId (request *reqb, Z_ReferenceId *refid)
1663 {
1664     if (refid)
1665     {
1666         reqb->len_refid = refid->len;
1667         reqb->refid = (char *)nmem_malloc (reqb->request_mem, refid->len);
1668         memcpy (reqb->refid, refid->buf, refid->len);
1669     }
1670     else
1671     {
1672         reqb->len_refid = 0;
1673         reqb->refid = NULL;
1674     }
1675 }
1676
1677 void bend_request_send (bend_association a, bend_request req, Z_APDU *res)
1678 {
1679     process_response (a, req, res);
1680 }
1681
1682 bend_request bend_request_mk (bend_association a)
1683 {
1684     request *nreq = request_get (&a->outgoing);
1685     nreq->request_mem = nmem_create ();
1686     return nreq;
1687 }
1688
1689 Z_ReferenceId *bend_request_getid (ODR odr, bend_request req)
1690 {
1691     Z_ReferenceId *id;
1692     if (!req->refid)
1693         return 0;
1694     id = (Odr_oct *)odr_malloc (odr, sizeof(*odr));
1695     id->buf = (unsigned char *)odr_malloc (odr, req->len_refid);
1696     id->len = id->size = req->len_refid;
1697     memcpy (id->buf, req->refid, req->len_refid);
1698     return id;
1699 }
1700
1701 void bend_request_destroy (bend_request *req)
1702 {
1703     nmem_destroy((*req)->request_mem);
1704     request_release(*req);
1705     *req = NULL;
1706 }
1707
1708 int bend_backend_respond (bend_association a, bend_request req)
1709 {
1710     return process_request (a, req);
1711 }
1712
1713 void bend_request_setdata(bend_request r, void *p)
1714 {
1715     r->clientData = p;
1716 }
1717
1718 void *bend_request_getdata(bend_request r)
1719 {
1720     return r->clientData;
1721 }
1722
1723 /* Chas: Added in from DALI */
1724 static Z_APDU *process_ESRequest(association *assoc, request *reqb, int *fd)
1725 {
1726     bend_esrequest_rr esrequest;
1727
1728     Z_ExtendedServicesRequest *req = reqb->request->u.extendedServicesRequest;
1729     Z_APDU *apdu = zget_APDU(assoc->encode, Z_APDU_extendedServicesResponse);
1730
1731     Z_ExtendedServicesResponse *resp = apdu->u.extendedServicesResponse;
1732
1733     logf(LOG_DEBUG,"inside Process esRequest");
1734
1735     esrequest.esr = reqb->request->u.extendedServicesRequest;
1736     esrequest.stream = assoc->encode;
1737     esrequest.errcode = 0;
1738     esrequest.errstring = NULL;
1739     esrequest.request = reqb;
1740     esrequest.association = assoc;
1741
1742     ((int (*)(void *, bend_esrequest_rr *))(*assoc->bend_esrequest))(assoc->backend,
1743                                                                    &esrequest);
1744
1745     /* If the response is being delayed, return NULL */
1746     if (esrequest.request == NULL)
1747         return(NULL);
1748
1749     resp->referenceId = req->referenceId;
1750
1751     if ( esrequest.errcode == 0 )
1752     {
1753         /* Backend service indicates request will be processed */
1754         logf(LOG_DEBUG,"Request will be processed...Good !");
1755         *resp->operationStatus = Z_ExtendedServicesResponse_done;
1756     }
1757     else
1758     {
1759         /* Backend indicates error, request will not be processed */
1760         logf(LOG_DEBUG,"Request will not be processed...BAD !");
1761         *resp->operationStatus = Z_ExtendedServicesResponse_failure;
1762     }
1763     /* Do something with the members of bend_extendedservice */
1764
1765     logf(LOG_DEBUG,"Send the result apdu");
1766
1767     return apdu;
1768 }
1769
1770 /* Chas: End of addition from DALI */