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