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