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