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