server/seshigh.c

   1 /*
   2  * Copyright (c) 1995-1999, Index Data
   3  * See the file LICENSE for details.
   4  * Sebastian Hammer, Adam Dickmeiss
   5  *
   6  * $Log: seshigh.c,v $
   7  * Revision 1.86  1999-02-02 13:57:38  adam
   8  * Uses preprocessor define WIN32 instead of WINDOWS to build code
   9  * for Microsoft WIN32.
  10  *
  11  * Revision 1.85  1998/11/17 09:52:59  adam
  12  * Fixed minor bug (introduced by previous commit).
  13  *
  14  * Revision 1.84  1998/11/16 16:02:32  adam
  15  * Added loggin utilies, log_rpn_query and log_scan_term. These used
  16  * to be part of Zebra.
  17  *
  18  * Revision 1.83  1998/11/03 10:09:36  adam
  19  * Fixed bug regarding YC.
  20  *
  21  * Revision 1.82  1998/10/20 14:00:30  quinn
  22  * Fixed Scan
  23  *
  24  * Revision 1.81  1998/10/13 16:12:24  adam
  25  * Added support for Surrogate Diagnostics for Scan Term entries.
  26  *
  27  * Revision 1.80  1998/09/02 12:41:53  adam
  28  * Added decode stream in bend search structures.
  29  *
  30  * Revision 1.79  1998/08/19 16:10:08  adam
  31  * Changed som member names of DeleteResultSetRequest/Response.
  32  *
  33  * Revision 1.78  1998/08/03 10:23:55  adam
  34  * Fixed bug regarding Options for Sort.
  35  *
  36  * Revision 1.77  1998/07/20 12:38:42  adam
  37  * Implemented delete result set service to server API.
  38  *
  39  * Revision 1.76  1998/05/27 16:57:07  adam
  40  * Support for surrogate diagnostic records added for bend_fetch.
  41  *
  42  * Revision 1.75  1998/05/18 10:13:07  adam
  43  * Fixed call to es_request handler - extra argument was passed.
  44  *
  45  * Revision 1.74  1998/03/31 15:13:20  adam
  46  * Development towards compiled ASN.1.
  47  *
  48  * Revision 1.73  1998/03/31 11:07:45  adam
  49  * Furhter work on UNIverse resource report.
  50  * Added Extended Services handling in frontend server.
  51  *
  52  * Revision 1.72  1998/02/11 11:53:35  adam
  53  * Changed code so that it compiles as C++.
  54  *
  55  * Revision 1.71  1998/02/10 11:03:57  adam
  56  * Added support for extended handlers in backend server interface.
  57  *
  58  * Revision 1.70  1998/01/29 13:15:35  adam
  59  * Implemented sort for the backend interface.
  60  *
  61  * Revision 1.69  1997/09/30 11:48:12  adam
  62  * Fixed bug introduced by previous commit.
  63  *
  64  * Revision 1.68  1997/09/29 13:18:59  adam
  65  * Added function, oid_ent_to_oid, to replace the function
  66  * oid_getoidbyent, which is not thread safe.
  67  *
  68  * Revision 1.67  1997/09/17 12:10:40  adam
  69  * YAZ version 1.4.
  70  *
  71  * Revision 1.66  1997/09/05 15:26:44  adam
  72  * Added ODR encode in search and scen bend request structures.
  73  * Fixed a few enums that caused trouble with C++.
  74  *
  75  * Revision 1.65  1997/09/01 08:53:01  adam
  76  * New windows NT/95 port using MSV5.0. The test server 'ztest' was
  77  * moved a separate directory. MSV5.0 project server.dsp created.
  78  * As an option, the server can now operate as an NT service.
  79  *
  80  * Revision 1.64  1997/04/30 08:52:11  quinn
  81  * Null
  82  *
  83  * Revision 1.63  1996/10/11  11:57:26  quinn
  84  * Smallish
  85  *
  86  * Revision 1.62  1996/07/06  19:58:35  quinn
  87  * System headerfiles gathered in yconfig
  88  *
  89  * Revision 1.61  1996/06/10  08:56:16  quinn
  90  * Work on Summary.
  91  *
  92  * Revision 1.60  1996/05/30  11:03:10  quinn
  93  * Fixed NextresultSetPosition bug fixed.
  94  *
  95  * Revision 1.59  1996/05/14  09:26:46  quinn
  96  * Added attribute set to scan backend
  97  *
  98  * Revision 1.58  1996/02/20  12:53:04  quinn
  99  * Chanes to SCAN
 100  *
 101  * Revision 1.57  1996/01/02  08:57:47  quinn
 102  * Changed enums in the ASN.1 .h files to #defines. Changed oident.class to oclass
 103  *
 104  * Revision 1.56  1995/12/14  11:09:57  quinn
 105  * Work on Explain
 106  *
 107  * Revision 1.55  1995/11/08  17:41:37  quinn
 108  * Smallish.
 109  *
 110  * Revision 1.54  1995/11/08  15:11:29  quinn
 111  * Log of close transmit.
 112  *
 113  * Revision 1.53  1995/11/01  13:54:58  quinn
 114  * Minor adjustments
 115  *
 116  * Revision 1.52  1995/11/01  12:19:13  quinn
 117  * Second attempt to fix same bug.
 118  *
 119  * Revision 1.50  1995/10/25  16:58:32  quinn
 120  * Simple.
 121  *
 122  * Revision 1.49  1995/10/16  13:51:53  quinn
 123  * Changes to provide Especs to the backend.
 124  *
 125  * Revision 1.48  1995/10/06  08:51:20  quinn
 126  * Added Write-buffer.
 127  *
 128  * Revision 1.47  1995/08/29  14:24:16  quinn
 129  * Added second half of close-handshake
 130  *
 131  * Revision 1.46  1995/08/29  11:17:58  quinn
 132  * Added code to receive close
 133  *
 134  * Revision 1.45  1995/08/21  09:11:00  quinn
 135  * Smallish fixes to suppport new formats.
 136  *
 137  * Revision 1.44  1995/08/17  12:45:25  quinn
 138  * Fixed minor problems with GRS-1. Added support in c&s.
 139  *
 140  * Revision 1.43  1995/08/15  12:00:31  quinn
 141  * Updated External
 142  *
 143  * Revision 1.42  1995/08/15  11:16:50  quinn
 144  *
 145  * Revision 1.41  1995/08/02  10:23:06  quinn
 146  * Smallish
 147  *
 148  * Revision 1.40  1995/07/31  14:34:26  quinn
 149  * Fixed bug in process_searchResponse (numberOfRecordsReturned).
 150  *
 151  * Revision 1.39  1995/06/27  13:21:00  quinn
 152  * SUTRS support
 153  *
 154  * Revision 1.38  1995/06/19  12:39:11  quinn
 155  * Fixed bug in timeout code. Added BER dumper.
 156  *
 157  * Revision 1.37  1995/06/16  13:16:14  quinn
 158  * Fixed Defaultdiagformat.
 159  *
 160  * Revision 1.36  1995/06/16  10:31:36  quinn
 161  * Added session timeout.
 162  *
 163  * Revision 1.35  1995/06/15  07:45:14  quinn
 164  * Moving to v3.
 165  *
 166  * Revision 1.34  1995/06/14  15:26:46  quinn
 167  * *** empty log message ***
 168  *
 169  * Revision 1.33  1995/06/06  14:57:05  quinn
 170  * Better diagnostics.
 171  *
 172  * Revision 1.32  1995/06/06  08:41:44  quinn
 173  * Better diagnostics.
 174  *
 175  * Revision 1.31  1995/06/06  08:15:37  quinn
 176  * Cosmetic.
 177  *
 178  * Revision 1.30  1995/06/05  10:53:32  quinn
 179  * Added a better SCAN.
 180  *
 181  * Revision 1.29  1995/06/01  11:25:03  quinn
 182  * Smallish.
 183  *
 184  * Revision 1.28  1995/06/01  11:21:01  quinn
 185  * Attempting to fix a bug in pack-records. replaced break with continue
 186  * for large records, according to standard.
 187  *
 188  * Revision 1.27  1995/05/29  08:12:06  quinn
 189  * Moved oid to util
 190  *
 191  * Revision 1.26  1995/05/18  13:02:12  quinn
 192  * Smallish.
 193  *
 194  * Revision 1.25  1995/05/17  08:42:26  quinn
 195  * Transfer auth info to backend. Allow backend to reject init gracefully.
 196  *
 197  * Revision 1.24  1995/05/16  08:51:04  quinn
 198  * License, documentation, and memory fixes
 199  *
 200  * Revision 1.23  1995/05/15  13:25:10  quinn
 201  * Fixed memory bug.
 202  *
 203  * Revision 1.22  1995/05/15  11:56:39  quinn
 204  * Asynchronous facilities. Restructuring of seshigh code.
 205  *
 206  * Revision 1.21  1995/05/02  08:53:19  quinn
 207  * Trying in vain to fix comm with ISODE
 208  *
 209  * Revision 1.20  1995/04/20  15:13:00  quinn
 210  * Cosmetic
 211  *
 212  * Revision 1.19  1995/04/18  08:15:34  quinn
 213  * Added dynamic memory allocation on encoding (whew). Code is now somewhat
 214  * neater. We'll make the same change for decoding one day.
 215  *
 216  * Revision 1.18  1995/04/17  11:28:25  quinn
 217  * Smallish
 218  *
 219  * Revision 1.17  1995/04/10  10:23:36  quinn
 220  * Some work to add scan and other things.
 221  *
 222  * Revision 1.16  1995/03/31  09:18:55  quinn
 223  * Added logging.
 224  *
 225  * Revision 1.15  1995/03/30  14:03:23  quinn
 226  * Added RFC1006 as separate library
 227  *
 228  * Revision 1.14  1995/03/30  12:18:17  quinn
 229  * Fixed bug.
 230  *
 231  * Revision 1.13  1995/03/30  09:09:24  quinn
 232  * Added state-handle and some support for asynchronous activities.
 233  *
 234  * Revision 1.12  1995/03/29  15:40:16  quinn
 235  * Ongoing work. Statserv is now dynamic by default
 236  *
 237  * Revision 1.11  1995/03/28  09:16:21  quinn
 238  * Added record packing to the search request
 239  *
 240  * Revision 1.10  1995/03/27  08:34:24  quinn
 241  * Added dynamic server functionality.
 242  * Released bindings to session.c (is now redundant)
 243  *
 244  * Revision 1.9  1995/03/22  15:01:26  quinn
 245  * Adjusting record packing.
 246  *
 247  * Revision 1.8  1995/03/22  10:13:21  quinn
 248  * Working on record packer
 249  *
 250  * Revision 1.7  1995/03/21  15:53:31  quinn
 251  * Little changes.
 252  *
 253  * Revision 1.6  1995/03/21  12:30:09  quinn
 254  * Beginning to add support for record packing.
 255  *
 256  * Revision 1.5  1995/03/17  10:44:13  quinn
 257  * Added catch of null-string in makediagrec
 258  *
 259  * Revision 1.4  1995/03/17  10:18:08  quinn
 260  * Added memory management.
 261  *
 262  * Revision 1.3  1995/03/16  17:42:39  quinn
 263  * Little changes
 264  *
 265  * Revision 1.2  1995/03/16  13:29:01  quinn
 266  * Partitioned server.
 267  *
 268  * Revision 1.1  1995/03/15  16:02:10  quinn
 269  * Modded session.c to seshigh.c
 270  *
 271  */
 272
 273 /*
 274  * Frontend server logic.
 275  *
 276  * This code receives incoming APDUs, and handles client requests by means
 277  * of the backend API.
 278  *
 279  * Some of the code is getting quite involved, compared to simpler servers -
 280  * primarily because it is asynchronous both in the communication with
 281  * the user and the backend. We think the complexity will pay off in
 282  * the form of greater flexibility when more asynchronous facilities
 283  * are implemented.
 284  *
 285  * Memory management has become somewhat involved. In the simple case, where
 286  * only one PDU is pending at a time, it will simply reuse the same memory,
 287  * once it has found its working size. When we enable multiple concurrent
 288  * operations, perhaps even with multiple parallel calls to the backend, it
 289  * will maintain a pool of buffers for encoding and decoding, trying to
 290  * minimize memory allocation/deallocation during normal operation.
 291  *
 292  * TODOs include (and will be done in order of public interest):
 293  *
 294  * Support for EXPLAIN - provide simple meta-database system.
 295  * Support for access control.
 296  * Support for resource control.
 297  * Support for extended services - primarily Item Order.
 298  * Rest of Z39.50-1994
 299  *
 300  */
 301
 302 #include <yconfig.h>
 303 #include <stdlib.h>
 304 #include <stdio.h>
 305 #ifdef WIN32
 306 #include <process.h>
 307 #else
 308 #include <unistd.h>
 309 #endif
 310 #include <assert.h>
 311
 312 #include <xmalloc.h>
 313 #include <comstack.h>
 314 #include "eventl.h"
 315 #include "session.h"
 316 #include <proto.h>
 317 #include <oid.h>
 318 #include <log.h>
 319 #include <logrpn.h>
 320 #include <statserv.h>
 321
 322 #include <backend.h>
 323
 324 static int process_request(association *assoc, request *req);
 325 void backend_response(IOCHAN i, int event);
 326 static int process_response(association *assoc, request *req, Z_APDU *res);
 327 static Z_APDU *process_initRequest(association *assoc, request *reqb);
 328 static Z_APDU *process_searchRequest(association *assoc, request *reqb,
 329     int *fd);
 330 static Z_APDU *response_searchRequest(association *assoc, request *reqb,
 331     bend_search_rr *bsrr, int *fd);
 332 static Z_APDU *process_presentRequest(association *assoc, request *reqb,
 333     int *fd);
 334 static Z_APDU *process_scanRequest(association *assoc, request *reqb, int *fd);
 335 static Z_APDU *process_sortRequest(association *assoc, request *reqb, int *fd);
 336 static void process_close(association *assoc, request *reqb);
 337 void save_referenceId (request *reqb, Z_ReferenceId *refid);
 338 static Z_APDU *process_deleteRequest(association *assoc, request *reqb,
 339     int *fd);
 340
 341 static FILE *apduf = 0; /* for use in static mode */
 342 static statserv_options_block *control_block = 0;
 343
 344 /* Chas: Added in from DALI */
 345 static Z_APDU *process_ESRequest(association *assoc, request *reqb, int *fd);
 346 /* Chas: End of addition from DALI */
 347
 348 /*
 349  * Create and initialize a new association-handle.
 350  *  channel  : iochannel for the current line.
 351  *  link     : communications channel.
 352  * Returns: 0 or a new association handle.
 353  */
 354 association *create_association(IOCHAN channel, COMSTACK link)
 355 {
 356     association *anew;
 357
 358     if (!control_block)
 359         control_block = statserv_getcontrol();
 360     if (!(anew = (association *)xmalloc(sizeof(*anew))))
 361         return 0;
 362     anew->client_chan = channel;
 363     anew->client_link = link;
 364     if (!(anew->decode = odr_createmem(ODR_DECODE)) ||
 365         !(anew->encode = odr_createmem(ODR_ENCODE)))
 366         return 0;
 367     if (*control_block->apdufile)
 368     {
 369         char filename[256];
 370         FILE *f;
 371
 372         strcpy(filename, control_block->apdufile);
 373         if (!(anew->print = odr_createmem(ODR_PRINT)))
 374             return 0;
 375         if (*control_block->apdufile != '-')
 376         {
 377             strcpy(filename, control_block->apdufile);
 378             if (!control_block->dynamic)
 379             {
 380                 if (!apduf)
 381                 {
 382                     if (!(apduf = fopen(filename, "w")))
 383                     {
 384                         logf(LOG_WARN|LOG_ERRNO, "%s", filename);
 385                         return 0;
 386                     }
 387                     setvbuf(apduf, 0, _IONBF, 0);
 388                 }
 389                 f = apduf;
 390             }
 391             else
 392             {
 393                 sprintf(filename + strlen(filename), ".%d", getpid());
 394                 if (!(f = fopen(filename, "w")))
 395                 {
 396                     logf(LOG_WARN|LOG_ERRNO, "%s", filename);
 397                     return 0;
 398                 }
 399                 setvbuf(f, 0, _IONBF, 0);
 400             }
 401             odr_setprint(anew->print, f);
 402         }
 403     }
 404     else
 405         anew->print = 0;
 406     anew->input_buffer = 0;
 407     anew->input_buffer_len = 0;
 408     anew->backend = 0;
 409     anew->state = ASSOC_NEW;
 410     request_initq(&anew->incoming);
 411     request_initq(&anew->outgoing);
 412     anew->proto = cs_getproto(link);
 413     return anew;
 414 }
 415
 416 /*
 417  * Free association and release resources.
 418  */
 419 void destroy_association(association *h)
 420 {
 421     odr_destroy(h->decode);
 422     odr_destroy(h->encode);
 423     if (h->print)
 424         odr_destroy(h->print);
 425     if (h->input_buffer)
 426     xfree(h->input_buffer);
 427     if (h->backend)
 428         bend_close(h->backend);
 429     while (request_deq(&h->incoming));
 430     while (request_deq(&h->outgoing));
 431     request_delq(&h->incoming);
 432     request_delq(&h->outgoing);
 433     xfree(h);
 434 }
 435
 436 static void do_close_req(association *a, int reason, char *message,
 437                          request *req)
 438 {
 439     Z_APDU apdu;
 440     Z_Close *cls = zget_Close(a->encode);
 441
 442     /* Purge request queue */
 443     while (request_deq(&a->incoming));
 444     while (request_deq(&a->outgoing));
 445     if (a->version >= 3)
 446     {
 447         logf(LOG_LOG, "Sending Close PDU, reason=%d, message=%s",
 448             reason, message ? message : "none");
 449         apdu.which = Z_APDU_close;
 450         apdu.u.close = cls;
 451         *cls->closeReason = reason;
 452         cls->diagnosticInformation = message;
 453         process_response(a, req, &apdu);
 454         iochan_settimeout(a->client_chan, 60);
 455     }
 456     else
 457     {
 458         logf(LOG_DEBUG, "v2 client. No Close PDU");
 459         iochan_setevent(a->client_chan, EVENT_TIMEOUT); /* force imm close */
 460     }
 461     a->state = ASSOC_DEAD;
 462 }
 463
 464 static void do_close(association *a, int reason, char *message)
 465 {
 466     do_close_req (a, reason, message, request_get(&a->outgoing));
 467 }
 468
 469 /*
 470  * This is where PDUs from the client are read and the further
 471  * processing is initiated. Flow of control moves down through the
 472  * various process_* functions below, until the encoded result comes back up
 473  * to the output handler in here.
 474  *
 475  *  h     : the I/O channel that has an outstanding event.
 476  *  event : the current outstanding event.
 477  */
 478 void ir_session(IOCHAN h, int event)
 479 {
 480     int res;
 481     association *assoc = (association *)iochan_getdata(h);
 482     COMSTACK conn = assoc->client_link;
 483     request *req;
 484
 485     assert(h && conn && assoc);
 486     if (event == EVENT_TIMEOUT)
 487     {
 488         if (assoc->state != ASSOC_UP)
 489         {
 490             logf(LOG_LOG, "Final timeout - closing connection.");
 491             cs_close(conn);
 492             destroy_association(assoc);
 493             iochan_destroy(h);
 494         }
 495         else
 496         {
 497             logf(LOG_LOG, "Session idle too long. Sending close.");
 498             do_close(assoc, Z_Close_lackOfActivity, 0);
 499         }
 500         return;
 501     }
 502     if (event & EVENT_INPUT || event & EVENT_WORK) /* input */
 503     {
 504         if (event & EVENT_INPUT)
 505         {
 506             logf(LOG_DEBUG, "ir_session (input)");
 507             assert(assoc && conn);
 508             /* We aren't speaking to this fellow */
 509             if (assoc->state == ASSOC_DEAD)
 510             {
 511                 logf(LOG_LOG, "Closed connection after reject");
 512                 cs_close(conn);
 513                 destroy_association(assoc);
 514                 iochan_destroy(h);
 515                 return;
 516             }
 517             if ((res = cs_get(conn, &assoc->input_buffer,
 518                 &assoc->input_buffer_len)) <= 0)
 519             {
 520                 logf(LOG_LOG, "Connection closed by client");
 521                 cs_close(conn);
 522                 destroy_association(assoc);
 523                 iochan_destroy(h);
 524                 return;
 525             }
 526             else if (res == 1) /* incomplete read - wait for more  */
 527                 return;
 528             if (cs_more(conn)) /* more stuff - call us again later, please */
 529                 iochan_setevent(h, EVENT_INPUT);
 530
 531             /* we got a complete PDU. Let's decode it */
 532             logf(LOG_DEBUG, "Got PDU, %d bytes", res);
 533             req = request_get(&assoc->incoming); /* get a new request structure */
 534             odr_reset(assoc->decode);
 535             odr_setbuf(assoc->decode, assoc->input_buffer, res, 0);
 536             if (!z_APDU(assoc->decode, &req->request, 0))
 537             {
 538                 logf(LOG_LOG, "ODR error on incoming PDU: %s [near byte %d] ",
 539                     odr_errmsg(odr_geterror(assoc->decode)),
 540                     odr_offset(assoc->decode));
 541                 logf(LOG_LOG, "PDU dump:");
 542                 odr_dumpBER(log_file(), assoc->input_buffer, res);
 543                 do_close(assoc, Z_Close_protocolError, "Malformed package");
 544                 return;
 545             }
 546             req->request_mem = odr_extract_mem(assoc->decode);
 547             if (assoc->print && !z_APDU(assoc->print, &req->request, 0))
 548             {
 549                 logf(LOG_WARN, "ODR print error: %s",
 550                     odr_errmsg(odr_geterror(assoc->print)));
 551                 odr_reset(assoc->print);
 552             }
 553             request_enq(&assoc->incoming, req);
 554         }
 555
 556         /* can we do something yet? */
 557         req = request_head(&assoc->incoming);
 558         if (req->state == REQUEST_IDLE)
 559         {
 560             request_deq(&assoc->incoming);
 561             if (process_request(assoc, req) < 0)
 562                 do_close_req(assoc, Z_Close_systemProblem, "Unknown error",
 563                              req);
 564         }
 565     }
 566     if (event & EVENT_OUTPUT)
 567     {
 568         request *req = request_head(&assoc->outgoing);
 569
 570         logf(LOG_DEBUG, "ir_session (output)");
 571         req->state = REQUEST_PENDING;
 572         switch (res = cs_put(conn, req->response, req->len_response))
 573         {
 574             case -1:
 575                 logf(LOG_LOG, "Connection closed by client");
 576                 cs_close(conn);
 577                 destroy_association(assoc);
 578                 iochan_destroy(h);
 579                 break;
 580             case 0: /* all sent - release the request structure */
 581                 logf(LOG_DEBUG, "Wrote PDU, %d bytes", req->len_response);
 582                 nmem_destroy(req->request_mem);
 583                 request_deq(&assoc->outgoing);
 584                 request_release(req);
 585                 if (!request_head(&assoc->outgoing))
 586                     iochan_clearflag(h, EVENT_OUTPUT);
 587                 break;
 588             /* value of 1 -- partial send -- is simply ignored */
 589         }
 590     }
 591     if (event & EVENT_EXCEPT)
 592     {
 593         logf(LOG_DEBUG, "ir_session (exception)");
 594         cs_close(conn);
 595         destroy_association(assoc);
 596         iochan_destroy(h);
 597     }
 598 }
 599
 600 /*
 601  * Initiate request processing.
 602  */
 603 static int process_request(association *assoc, request *req)
 604 {
 605     int fd = -1;
 606     Z_APDU *res;
 607     int retval;
 608
 609     assert(req && req->state == REQUEST_IDLE);
 610     switch (req->request->which)
 611     {
 612         case Z_APDU_initRequest:
 613             res = process_initRequest(assoc, req); break;
 614         case Z_APDU_searchRequest:
 615             res = process_searchRequest(assoc, req, &fd); break;
 616         case Z_APDU_presentRequest:
 617             res = process_presentRequest(assoc, req, &fd); break;
 618         case Z_APDU_scanRequest:
 619             res = process_scanRequest(assoc, req, &fd); break;
 620         case Z_APDU_extendedServicesRequest:
 621             if (assoc->bend_esrequest)
 622                 res = process_ESRequest(assoc, req, &fd);
 623             else
 624             {
 625                 logf(LOG_WARN, "Cannot handle EXTENDED SERVICES APDU");
 626                 return -1;
 627             }
 628             break;
 629         case Z_APDU_sortRequest:
 630             if (assoc->bend_sort)
 631                 res = process_sortRequest(assoc, req, &fd);
 632             else
 633             {
 634                 logf(LOG_WARN, "Cannot handle SORT APDU");
 635                 return -1;
 636             }
 637             break;
 638         case Z_APDU_close:
 639             process_close(assoc, req); return 0;
 640         case Z_APDU_deleteResultSetRequest:
 641             if (assoc->bend_delete)
 642                 res = process_deleteRequest(assoc, req, &fd);
 643             else
 644             {
 645                 logf (LOG_WARN, "Cannot handle Delete APDU");
 646                 return -1;
 647             }
 648             break;
 649         default:
 650             logf(LOG_WARN, "Bad APDU received");
 651             return -1;
 652     }
 653     if (res)
 654     {
 655         logf(LOG_DEBUG, "  result immediately available");
 656         retval = process_response(assoc, req, res);
 657     }
 658     else if (fd < 0)
 659     {
 660         logf(LOG_DEBUG, "  result unavailble");
 661         retval = 0;
 662     }
 663     else /* no result yet - one will be provided later */
 664     {
 665         IOCHAN chan;
 666
 667         /* Set up an I/O handler for the fd supplied by the backend */
 668
 669         logf(LOG_DEBUG, "   establishing handler for result");
 670         req->state = REQUEST_PENDING;
 671         if (!(chan = iochan_create(fd, backend_response, EVENT_INPUT)))
 672             abort();
 673         iochan_setdata(chan, assoc);
 674         retval = 0;
 675     }
 676     return retval;
 677 }
 678
 679 /*
 680  * Handle message from the backend.
 681  */
 682 void backend_response(IOCHAN i, int event)
 683 {
 684     association *assoc = (association *)iochan_getdata(i);
 685     request *req = request_head(&assoc->incoming);
 686     Z_APDU *res;
 687     int fd;
 688
 689     logf(LOG_DEBUG, "backend_response");
 690     assert(assoc && req && req->state != REQUEST_IDLE);
 691     /* determine what it is we're waiting for */
 692     switch (req->request->which)
 693     {
 694         case Z_APDU_searchRequest:
 695             res = response_searchRequest(assoc, req, 0, &fd); break;
 696 #if 0
 697         case Z_APDU_presentRequest:
 698             res = response_presentRequest(assoc, req, 0, &fd); break;
 699         case Z_APDU_scanRequest:
 700             res = response_scanRequest(assoc, req, 0, &fd); break;
 701 #endif
 702         default:
 703             logf(LOG_WARN, "Serious programmer's lapse or bug");
 704             abort();
 705     }
 706     if ((res && process_response(assoc, req, res) < 0) || fd < 0)
 707     {
 708         logf(LOG_LOG, "Fatal error when talking to backend");
 709         do_close(assoc, Z_Close_systemProblem, 0);
 710         iochan_destroy(i);
 711         return;
 712     }
 713     else if (!res) /* no result yet - try again later */
 714     {
 715         logf(LOG_DEBUG, "   no result yet");
 716         iochan_setfd(i, fd); /* in case fd has changed */
 717     }
 718 }
 719
 720 /*
 721  * Encode response, and transfer the request structure to the outgoing queue.
 722  */
 723 static int process_response(association *assoc, request *req, Z_APDU *res)
 724 {
 725     odr_setbuf(assoc->encode, req->response, req->size_response, 1);
 726     if (!z_APDU(assoc->encode, &res, 0))
 727     {
 728         logf(LOG_WARN, "ODR error when encoding response: %s",
 729             odr_errmsg(odr_geterror(assoc->decode)));
 730         odr_reset(assoc->encode);
 731         return -1;
 732     }
 733     req->response = odr_getbuf(assoc->encode, &req->len_response,
 734         &req->size_response);
 735     odr_setbuf(assoc->encode, 0, 0, 0); /* don'txfree if we abort later */
 736     if (assoc->print && !z_APDU(assoc->print, &res, 0))
 737     {
 738         logf(LOG_WARN, "ODR print error: %s",
 739             odr_errmsg(odr_geterror(assoc->print)));
 740         odr_reset(assoc->print);
 741     }
 742     odr_reset(assoc->encode);
 743     req->state = REQUEST_IDLE;
 744     request_enq(&assoc->outgoing, req);
 745     /* turn the work over to the ir_session handler */
 746     iochan_setflag(assoc->client_chan, EVENT_OUTPUT);
 747     /* Is there more work to be done? give that to the input handler too */
 748 #if 1
 749     if (request_head(&assoc->incoming))
 750     {
 751         logf (LOG_DEBUG, "more work to be done");
 752         iochan_setevent(assoc->client_chan, EVENT_WORK);
 753     }
 754 #endif
 755     return 0;
 756 }
 757
 758 /*
 759  * Handle init request.
 760  * At the moment, we don't check the options
 761  * anywhere else in the code - we just try not to do anything that would
 762  * break a naive client. We'll toss 'em into the association block when
 763  * we need them there.
 764  */
 765 static Z_APDU *process_initRequest(association *assoc, request *reqb)
 766 {
 767     Z_InitRequest *req = reqb->request->u.initRequest;
 768     Z_APDU *apdu = zget_APDU(assoc->encode, Z_APDU_initResponse);
 769     Z_InitResponse *resp = apdu->u.initResponse;
 770     bend_initrequest binitreq;
 771     bend_initresult *binitres;
 772     char options[100];
 773
 774     logf(LOG_LOG, "Got initRequest");
 775     if (req->implementationId)
 776         logf(LOG_LOG, "Id:        %s", req->implementationId);
 777     if (req->implementationName)
 778         logf(LOG_LOG, "Name:      %s", req->implementationName);
 779     if (req->implementationVersion)
 780         logf(LOG_LOG, "Version:   %s", req->implementationVersion);
 781
 782     binitreq.stream = assoc->encode;
 783     binitreq.configname = "default-config";
 784     binitreq.auth = req->idAuthentication;
 785     binitreq.bend_sort = NULL;
 786     binitreq.bend_search = NULL;
 787     binitreq.bend_present = NULL;
 788     binitreq.bend_esrequest = NULL;
 789     binitreq.bend_delete = NULL;
 790     if (!(binitres = bend_init(&binitreq)))
 791     {
 792         logf(LOG_WARN, "Bad response from backend.");
 793         return 0;
 794     }
 795
 796     assoc->backend = binitres->handle;
 797     if ((assoc->bend_sort = (int (*)())binitreq.bend_sort))
 798         logf (LOG_DEBUG, "Sort handler installed");
 799     if ((assoc->bend_search = (int (*)())binitreq.bend_search))
 800         logf (LOG_DEBUG, "Search handler installed");
 801     if ((assoc->bend_present = (int (*)())binitreq.bend_present))
 802         logf (LOG_DEBUG, "Present handler installed");
 803     if ((assoc->bend_esrequest = (int (*)())binitreq.bend_esrequest))
 804         logf (LOG_DEBUG, "ESRequest handler installed");
 805     if ((assoc->bend_delete = (int (*)())binitreq.bend_delete))
 806         logf (LOG_DEBUG, "Delete handler installed");
 807
 808     resp->referenceId = req->referenceId;
 809     *options = '\0';
 810     /* let's tell the client what we can do */
 811     if (ODR_MASK_GET(req->options, Z_Options_search))
 812     {
 813         ODR_MASK_SET(resp->options, Z_Options_search);
 814         strcat(options, "srch");
 815     }
 816     if (ODR_MASK_GET(req->options, Z_Options_present))
 817     {
 818         ODR_MASK_SET(resp->options, Z_Options_present);
 819         strcat(options, " prst");
 820     }
 821     if (ODR_MASK_GET(req->options, Z_Options_delSet) && binitreq.bend_delete)
 822     {
 823         ODR_MASK_SET(resp->options, Z_Options_delSet);
 824         strcat(options, " del");
 825     }
 826     if (ODR_MASK_GET(req->options, Z_Options_extendedServices) &&
 827         binitreq.bend_esrequest)
 828     {
 829         ODR_MASK_SET(resp->options, Z_Options_extendedServices);
 830         strcat (options, " extendedServices");
 831     }
 832     if (ODR_MASK_GET(req->options, Z_Options_namedResultSets))
 833     {
 834         ODR_MASK_SET(resp->options, Z_Options_namedResultSets);
 835         strcat(options, " namedresults");
 836     }
 837     if (ODR_MASK_GET(req->options, Z_Options_scan))
 838     {
 839         ODR_MASK_SET(resp->options, Z_Options_scan);
 840         strcat(options, " scan");
 841     }
 842     if (ODR_MASK_GET(req->options, Z_Options_concurrentOperations))
 843     {
 844         ODR_MASK_SET(resp->options, Z_Options_concurrentOperations);
 845         strcat(options, " concurop");
 846     }
 847     if (ODR_MASK_GET(req->options, Z_Options_sort) && binitreq.bend_sort)
 848     {
 849         ODR_MASK_SET(resp->options, Z_Options_sort);
 850         strcat(options, " sort");
 851     }
 852     if (ODR_MASK_GET(req->protocolVersion, Z_ProtocolVersion_1))
 853     {
 854         ODR_MASK_SET(resp->protocolVersion, Z_ProtocolVersion_1);
 855         assoc->version = 2; /* 1 & 2 are equivalent */
 856     }
 857     if (ODR_MASK_GET(req->protocolVersion, Z_ProtocolVersion_2))
 858     {
 859         ODR_MASK_SET(resp->protocolVersion, Z_ProtocolVersion_2);
 860         assoc->version = 2;
 861     }
 862     if (ODR_MASK_GET(req->protocolVersion, Z_ProtocolVersion_3))
 863     {
 864         ODR_MASK_SET(resp->protocolVersion, Z_ProtocolVersion_3);
 865         assoc->version = 3;
 866     }
 867     logf(LOG_LOG, "Negotiated to v%d: %s", assoc->version, options);
 868     assoc->maximumRecordSize = *req->maximumRecordSize;
 869     if (assoc->maximumRecordSize > control_block->maxrecordsize)
 870         assoc->maximumRecordSize = control_block->maxrecordsize;
 871     assoc->preferredMessageSize = *req->preferredMessageSize;
 872     if (assoc->preferredMessageSize > assoc->maximumRecordSize)
 873         assoc->preferredMessageSize = assoc->maximumRecordSize;
 874     resp->preferredMessageSize = &assoc->preferredMessageSize;
 875     resp->maximumRecordSize = &assoc->maximumRecordSize;
 876     resp->implementationName = "Index Data/YAZ Generic Frontend Server";
 877     if (binitres->errcode)
 878     {
 879         logf(LOG_LOG, "Connection rejected by backend.");
 880         *resp->result = 0;
 881         assoc->state = ASSOC_DEAD;
 882     }
 883     else
 884         assoc->state = ASSOC_UP;
 885     return apdu;
 886 }
 887
 888 /*
 889  * These functions should be merged.
 890  */
 891
 892 static void set_addinfo (Z_DefaultDiagFormat *dr, char *addinfo)
 893 {
 894 #if ASN_COMPILED
 895     dr->which = Z_DefaultDiagFormat_v2Addinfo;
 896     dr->u.v2Addinfo = addinfo ? addinfo : "";
 897 #else
 898     dr->which = Z_DiagForm_v2AddInfo;
 899     dr->addinfo = addinfo ? addinfo : "";
 900 #endif
 901 }
 902
 903 /*
 904  * nonsurrogate diagnostic record.
 905  */
 906 static Z_Records *diagrec(association *assoc, int error, char *addinfo)
 907 {
 908     int oid[OID_SIZE];
 909     Z_Records *rec = (Z_Records *)
 910         odr_malloc (assoc->encode, sizeof(*rec));
 911     oident bib1;
 912     int *err = (int *)
 913         odr_malloc (assoc->encode, sizeof(*err));
 914     Z_DiagRec *drec = (Z_DiagRec *)
 915         odr_malloc (assoc->encode, sizeof(*drec));
 916     Z_DefaultDiagFormat *dr = (Z_DefaultDiagFormat *)
 917         odr_malloc (assoc->encode, sizeof(*dr));
 918
 919     bib1.proto = assoc->proto;
 920     bib1.oclass = CLASS_DIAGSET;
 921     bib1.value = VAL_BIB1;
 922
 923     logf(LOG_DEBUG, "Diagnostic: %d -- %s", error, addinfo ? addinfo :
 924         "NULL");
 925     *err = error;
 926     rec->which = Z_Records_NSD;
 927 #if ASN_COMPILED
 928     rec->u.nonSurrogateDiagnostic = dr;
 929 #else
 930 #ifdef Z_95
 931     rec->u.nonSurrogateDiagnostic = drec;
 932     drec->which = Z_DiagRec_defaultFormat;
 933     drec->u.defaultFormat = dr;
 934 #else
 935     rec->u.nonSurrogateDiagnostic = dr;
 936 #endif
 937 #endif
 938     dr->diagnosticSetId = odr_oiddup (assoc->encode,
 939                                       oid_ent_to_oid(&bib1, oid));
 940     dr->condition = err;
 941     set_addinfo (dr, addinfo);
 942     return rec;
 943 }
 944
 945 /*
 946  * surrogate diagnostic.
 947  */
 948 static Z_NamePlusRecord *surrogatediagrec(association *assoc, char *dbname,
 949                                           int error, char *addinfo)
 950 {
 951     int oid[OID_SIZE];
 952     Z_NamePlusRecord *rec = (Z_NamePlusRecord *)odr_malloc (assoc->encode, sizeof(*rec));
 953     int *err = (int *)odr_malloc (assoc->encode, sizeof(*err));
 954     oident bib1;
 955     Z_DiagRec *drec = (Z_DiagRec *)odr_malloc (assoc->encode, sizeof(*drec));
 956     Z_DefaultDiagFormat *dr = (Z_DefaultDiagFormat *)odr_malloc (assoc->encode, sizeof(*dr));
 957
 958     bib1.proto = assoc->proto;
 959     bib1.oclass = CLASS_DIAGSET;
 960     bib1.value = VAL_BIB1;
 961
 962     logf(LOG_DEBUG, "SurrogateDiagnotic: %d -- %s", error, addinfo);
 963     *err = error;
 964     rec->databaseName = dbname;
 965     rec->which = Z_NamePlusRecord_surrogateDiagnostic;
 966     rec->u.surrogateDiagnostic = drec;
 967     drec->which = Z_DiagRec_defaultFormat;
 968     drec->u.defaultFormat = dr;
 969     dr->diagnosticSetId = odr_oiddup (assoc->encode,
 970                                       oid_ent_to_oid(&bib1, oid));
 971     dr->condition = err;
 972     set_addinfo (dr, addinfo);
 973
 974     return rec;
 975 }
 976
 977 /*
 978  * multiple nonsurrogate diagnostics.
 979  */
 980 static Z_DiagRecs *diagrecs(association *assoc, int error, char *addinfo)
 981 {
 982     int oid[OID_SIZE];
 983     Z_DiagRecs *recs = (Z_DiagRecs *)odr_malloc (assoc->encode, sizeof(*recs));
 984     int *err = (int *)odr_malloc (assoc->encode, sizeof(*err));
 985     oident bib1;
 986     Z_DiagRec **recp = (Z_DiagRec **)odr_malloc (assoc->encode, sizeof(*recp));
 987     Z_DiagRec *drec = (Z_DiagRec *)odr_malloc (assoc->encode, sizeof(*drec));
 988     Z_DefaultDiagFormat *rec = (Z_DefaultDiagFormat *)odr_malloc (assoc->encode, sizeof(*rec));
 989
 990     logf(LOG_DEBUG, "DiagRecs: %d -- %s", error, addinfo ? addinfo : "");
 991     bib1.proto = assoc->proto;
 992     bib1.oclass = CLASS_DIAGSET;
 993     bib1.value = VAL_BIB1;
 994
 995     *err = error;
 996     recs->num_diagRecs = 1;
 997     recs->diagRecs = recp;
 998     recp[0] = drec;
 999     drec->which = Z_DiagRec_defaultFormat;
1000     drec->u.defaultFormat = rec;
1001
1002     rec->diagnosticSetId = odr_oiddup (assoc->encode,
1003                                       oid_ent_to_oid(&bib1, oid));
1004     rec->condition = err;
1005
1006 #ifdef ASN_COMPILED
1007     rec->which = Z_DefaultDiagFormat_v2Addinfo;
1008     rec->u.v2Addinfo = addinfo ? addinfo : "";
1009 #else
1010     rec->which = Z_DiagForm_v2AddInfo;
1011     rec->addinfo = addinfo ? addinfo : "";
1012 #endif
1013     return recs;
1014 }
1015
1016 static Z_Records *pack_records(association *a, char *setname, int start,
1017                                 int *num, Z_RecordComposition *comp,
1018                                 int *next, int *pres, oid_value format)
1019 {
1020     int oid[OID_SIZE];
1021     int recno, total_length = 0, toget = *num, dumped_records = 0;
1022     Z_Records *records =
1023         (Z_Records *) odr_malloc (a->encode, sizeof(*records));
1024     Z_NamePlusRecordList *reclist =
1025         (Z_NamePlusRecordList *) odr_malloc (a->encode, sizeof(*reclist));
1026     Z_NamePlusRecord **list =
1027         (Z_NamePlusRecord **) odr_malloc (a->encode, sizeof(*list) * toget);
1028     oident recform;
1029
1030     records->which = Z_Records_DBOSD;
1031     records->u.databaseOrSurDiagnostics = reclist;
1032     reclist->num_records = 0;
1033     reclist->records = list;
1034     *pres = Z_PRES_SUCCESS;
1035     *num = 0;
1036     *next = 0;
1037
1038     logf(LOG_LOG, "Request to pack %d+%d", start, toget);
1039     logf(LOG_DEBUG, "pms=%d, mrs=%d", a->preferredMessageSize,
1040         a->maximumRecordSize);
1041     for (recno = start; reclist->num_records < toget; recno++)
1042     {
1043         bend_fetchrequest freq;
1044         bend_fetchresult *fres;
1045         Z_NamePlusRecord *thisrec;
1046         Z_DatabaseRecord *thisext;
1047         int this_length = 0;
1048
1049         /*
1050          * we get the number of bytes allocated on the stream before any
1051          * allocation done by the backend - this should give us a reasonable
1052          * idea of the total size of the data so far.
1053          */
1054         total_length = odr_total(a->encode) - dumped_records;
1055         freq.setname = setname;
1056         freq.number = recno;
1057         freq.comp = comp;
1058         freq.format = format;
1059         freq.stream = a->encode;
1060         freq.surrogate_flag = 0;
1061         if (!(fres = bend_fetch(a->backend, &freq, 0)))
1062         {
1063             *pres = Z_PRES_FAILURE;
1064             return diagrec(a, 2, "Backend interface problem");
1065         }
1066         /* backend should be able to signal whether error is system-wide
1067            or only pertaining to current record */
1068         if (fres->errcode)
1069         {
1070             if (!freq.surrogate_flag)
1071             {
1072                 *pres = Z_PRES_FAILURE;
1073                 return diagrec(a, fres->errcode, fres->errstring);
1074             }
1075             reclist->records[reclist->num_records] =
1076                 surrogatediagrec(a, fres->basename, fres->errcode,
1077                                  fres->errstring);
1078             reclist->num_records++;
1079             *next = fres->last_in_set ? 0 : recno + 1;
1080             continue;
1081         }
1082         if (fres->len >= 0)
1083             this_length = fres->len;
1084         else
1085             this_length = odr_total(a->encode) - total_length;
1086         logf(LOG_DEBUG, "  fetched record, len=%d, total=%d",
1087             this_length, total_length);
1088         if (this_length + total_length > a->preferredMessageSize)
1089         {
1090             /* record is small enough, really */
1091             if (this_length <= a->preferredMessageSize)
1092             {
1093                 logf(LOG_DEBUG, "  Dropped last normal-sized record");
1094                 *pres = Z_PRES_PARTIAL_2;
1095                 break;
1096             }
1097             /* record can only be fetched by itself */
1098             if (this_length < a->maximumRecordSize)
1099             {
1100                 logf(LOG_DEBUG, "  Record > prefmsgsz");
1101                 if (toget > 1)
1102                 {
1103                     logf(LOG_DEBUG, "  Dropped it");
1104                     reclist->records[reclist->num_records] =
1105                          surrogatediagrec(a, fres->basename, 16, 0);
1106                     reclist->num_records++;
1107                     *next = fres->last_in_set ? 0 : recno + 1;
1108                     dumped_records += this_length;
1109                     continue;
1110                 }
1111             }
1112             else /* too big entirely */
1113             {
1114                 logf(LOG_DEBUG, "Record > maxrcdsz");
1115                 reclist->records[reclist->num_records] =
1116                     surrogatediagrec(a, fres->basename, 17, 0);
1117                 reclist->num_records++;
1118                 *next = fres->last_in_set ? 0 : recno + 1;
1119                 dumped_records += this_length;
1120                 continue;
1121             }
1122         }
1123
1124         if (!(thisrec = (Z_NamePlusRecord *)odr_malloc(a->encode, sizeof(*thisrec))))
1125             return 0;
1126         if (!(thisrec->databaseName = (char *)odr_malloc(a->encode,
1127             strlen(fres->basename) + 1)))
1128             return 0;
1129         strcpy(thisrec->databaseName, fres->basename);
1130         thisrec->which = Z_NamePlusRecord_databaseRecord;
1131         if (!(thisrec->u.databaseRecord = thisext = (Z_External *)odr_malloc(a->encode,
1132             sizeof(Z_DatabaseRecord))))
1133             return 0;
1134         recform.proto = a->proto;
1135         recform.oclass = CLASS_RECSYN;
1136         recform.value = fres->format;
1137         thisext->direct_reference = odr_oiddup(a->encode,
1138                                                oid_ent_to_oid(&recform, oid));
1139         thisext->indirect_reference = 0;
1140         thisext->descriptor = 0;
1141         if (fres->len < 0) /* Structured data */
1142         {
1143             switch (fres->format)
1144             {
1145                 case VAL_SUTRS: thisext->which = Z_External_sutrs; break;
1146                 case VAL_GRS1: thisext->which = Z_External_grs1; break;
1147                 case VAL_EXPLAIN: thisext->which = Z_External_explainRecord;
1148                     break;
1149                 case VAL_SUMMARY: thisext->which = Z_External_summary; break;
1150                 case VAL_OPAC: thisext->which = Z_External_OPAC; break;
1151
1152                 default:
1153                     logf(LOG_FATAL, "Unknown structured format from backend.");
1154                     return 0;
1155             }
1156
1157             /*
1158              * We cheat on the pointers here. Obviously, the record field
1159              * of the backend-fetch structure should have been a union for
1160              * correctness, but we're stuck with this for backwards
1161              * compatibility.
1162              */
1163             thisext->u.grs1 = (Z_GenericRecord*) fres->record;
1164         }
1165         else if (fres->format == VAL_SUTRS) /* SUTRS is a single-ASN.1-type */
1166         {
1167 #if 0
1168             Z_SUTRS *sutrs = (Z_SUTRS *)odr_malloc(a->encode, 1+fres->len);
1169
1170             memcpy(sutrs, fres->record, fres->len);
1171             sutrs[fres->len] = '\0';
1172 #else
1173             Odr_oct *sutrs = (Odr_oct *)odr_malloc(a->encode, sizeof(*sutrs));
1174
1175             thisext->which = Z_External_sutrs;
1176             thisext->u.sutrs = sutrs;
1177             sutrs->buf = (unsigned char *)odr_malloc(a->encode, fres->len);
1178             sutrs->len = sutrs->size = fres->len;
1179             memcpy(sutrs->buf, fres->record, fres->len);
1180 #endif
1181         }
1182         else /* octet-aligned record. */
1183         {
1184             thisext->which = Z_External_octet;
1185             if (!(thisext->u.octet_aligned = (Odr_oct *)odr_malloc(a->encode,
1186                 sizeof(Odr_oct))))
1187                 return 0;
1188             if (!(thisext->u.octet_aligned->buf = (unsigned char *)odr_malloc(a->encode,
1189                 fres->len)))
1190                 return 0;
1191             memcpy(thisext->u.octet_aligned->buf, fres->record, fres->len);
1192             thisext->u.octet_aligned->len = thisext->u.octet_aligned->size =
1193                 fres->len;
1194         }
1195         reclist->records[reclist->num_records] = thisrec;
1196         reclist->num_records++;
1197         *next = fres->last_in_set ? 0 : recno + 1;
1198     }
1199     *num = reclist->num_records;
1200     return records;
1201 }
1202
1203 static Z_APDU *process_searchRequest(association *assoc, request *reqb,
1204     int *fd)
1205 {
1206     Z_SearchRequest *req = reqb->request->u.searchRequest;
1207     bend_search_rr *bsrr =
1208         (bend_search_rr *)nmem_malloc (reqb->request_mem, sizeof(*bsrr));
1209
1210     logf(LOG_LOG, "Got SearchRequest.");
1211     save_referenceId (reqb, req->referenceId);
1212     /* store ref id in request */
1213     bsrr->fd = fd;
1214     bsrr->request = reqb;
1215     bsrr->association = assoc;
1216
1217     logf (LOG_LOG, "ResultSet '%s'", req->resultSetName);
1218     if (req->databaseNames)
1219     {
1220         int i;
1221         for (i = 0; i < req->num_databaseNames; i++)
1222             logf (LOG_LOG, "Database '%s'", req->databaseNames[i]);
1223     }
1224     switch (req->query->which)
1225     {
1226     case Z_Query_type_1: case Z_Query_type_101:
1227         log_rpn_query (req->query->u.type_1);
1228     }
1229     if (assoc->bend_search)
1230     {
1231         bsrr->setname = req->resultSetName;
1232         bsrr->replace_set = *req->replaceIndicator;
1233         bsrr->num_bases = req->num_databaseNames;
1234         bsrr->basenames = req->databaseNames;
1235         bsrr->query = req->query;
1236         bsrr->stream = assoc->encode;
1237         bsrr->decode = assoc->decode;
1238         bsrr->errcode = 0;
1239         bsrr->hits = 0;
1240         bsrr->errstring = NULL;
1241         ((int (*)(void *, bend_search_rr *))(assoc->bend_search))
1242             (assoc->backend, bsrr);
1243         if (!bsrr->request)
1244             return 0;
1245     }
1246     else
1247     {
1248         bend_searchrequest bsrq;
1249         bend_searchresult *bsrt;
1250
1251         bsrq.setname = req->resultSetName;
1252         bsrq.replace_set = *req->replaceIndicator;
1253         bsrq.num_bases = req->num_databaseNames;
1254         bsrq.basenames = req->databaseNames;
1255         bsrq.query = req->query;
1256         bsrq.stream = assoc->encode;
1257         bsrq.decode = assoc->decode;
1258         if (!(bsrt = bend_search(assoc->backend, &bsrq, fd)))
1259             return 0;
1260         bsrr->hits = bsrt->hits;
1261         bsrr->errcode = bsrt->errcode;
1262         bsrr->errstring = bsrt->errstring;
1263     }
1264     return response_searchRequest(assoc, reqb, bsrr, fd);
1265 }
1266
1267 int bend_searchresponse(void *handle, bend_search_rr *bsrr) {return 0;}
1268
1269 /*
1270  * Prepare a searchresponse based on the backend results. We probably want
1271  * to look at making the fetching of records nonblocking as well, but
1272  * so far, we'll keep things simple.
1273  * If bsrt is null, that means we're called in response to a communications
1274  * event, and we'll have to get the response for ourselves.
1275  */
1276 static Z_APDU *response_searchRequest(association *assoc, request *reqb,
1277     bend_search_rr *bsrt, int *fd)
1278 {
1279     Z_SearchRequest *req = reqb->request->u.searchRequest;
1280     Z_APDU *apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1281     Z_SearchResponse *resp = (Z_SearchResponse *)odr_malloc (assoc->encode, sizeof(*resp));
1282     int *nulint = (int *)odr_malloc (assoc->encode, sizeof(*nulint));
1283     bool_t *sr = (bool_t *)odr_malloc (assoc->encode, sizeof(*sr));
1284     int *next = (int *)odr_malloc (assoc->encode, sizeof(*next));
1285     int *none = (int *)odr_malloc (assoc->encode, sizeof(*none));
1286
1287     *nulint = 0;
1288     *sr = 1;
1289     *next = 0;
1290     *none = Z_RES_NONE;
1291
1292     apdu->which = Z_APDU_searchResponse;
1293     apdu->u.searchResponse = resp;
1294     resp->referenceId = req->referenceId;
1295     resp->additionalSearchInfo = 0;
1296     resp->otherInfo = 0;
1297     *fd = -1;
1298     if (!bsrt && !bend_searchresponse(assoc->backend, bsrt))
1299     {
1300         logf(LOG_FATAL, "Bad result from backend");
1301         return 0;
1302     }
1303     else if (bsrt->errcode)
1304     {
1305         resp->records = diagrec(assoc, bsrt->errcode, bsrt->errstring);
1306         resp->resultCount = nulint;
1307         resp->numberOfRecordsReturned = nulint;
1308         resp->nextResultSetPosition = nulint;
1309         resp->searchStatus = nulint;
1310         resp->resultSetStatus = none;
1311         resp->presentStatus = 0;
1312     }
1313     else
1314     {
1315         int *toget = (int *)odr_malloc (assoc->encode, sizeof(*toget));
1316         int *presst = (int *)odr_malloc (assoc->encode, sizeof(*presst));
1317         Z_RecordComposition comp, *compp = 0;
1318
1319         *toget = 0;
1320         *presst = 0;
1321         resp->records = 0;
1322         resp->resultCount = &bsrt->hits;
1323
1324         comp.which = Z_RecordComp_simple;
1325         /* how many records does the user agent want, then? */
1326         if (bsrt->hits <= *req->smallSetUpperBound)
1327         {
1328             *toget = bsrt->hits;
1329             if ((comp.u.simple = req->smallSetElementSetNames))
1330                 compp = &comp;
1331         }
1332         else if (bsrt->hits < *req->largeSetLowerBound)
1333         {
1334             *toget = *req->mediumSetPresentNumber;
1335             if (*toget > bsrt->hits)
1336                 *toget = bsrt->hits;
1337             if ((comp.u.simple = req->mediumSetElementSetNames))
1338                 compp = &comp;
1339         }
1340         else
1341             *toget = 0;
1342
1343         if (*toget && !resp->records)
1344         {
1345             oident *prefformat;
1346             oid_value form;
1347
1348             if (!(prefformat = oid_getentbyoid(req->preferredRecordSyntax)) ||
1349                 prefformat->oclass != CLASS_RECSYN)
1350                 form = VAL_NONE;
1351             else
1352                 form = prefformat->value;
1353             resp->records = pack_records(assoc, req->resultSetName, 1,
1354                 toget, compp, next, presst, form);
1355             if (!resp->records)
1356                 return 0;
1357             resp->numberOfRecordsReturned = toget;
1358             resp->nextResultSetPosition = next;
1359             resp->searchStatus = sr;
1360             resp->resultSetStatus = 0;
1361             resp->presentStatus = presst;
1362         }
1363         else
1364         {
1365             if (*resp->resultCount)
1366                 *next = 1;
1367             resp->numberOfRecordsReturned = nulint;
1368             resp->nextResultSetPosition = next;
1369             resp->searchStatus = sr;
1370             resp->resultSetStatus = 0;
1371             resp->presentStatus = 0;
1372         }
1373     }
1374     return apdu;
1375 }
1376
1377 /*
1378  * Maybe we got a little over-friendly when we designed bend_fetch to
1379  * get only one record at a time. Some backends can optimise multiple-record
1380  * fetches, and at any rate, there is some overhead involved in
1381  * all that selecting and hopping around. Problem is, of course, that the
1382  * frontend can't know ahead of time how many records it'll need to
1383  * fill the negotiated PDU size. Annoying. Segmentation or not, Z/SR
1384  * is downright lousy as a bulk data transfer protocol.
1385  *
1386  * To start with, we'll do the fetching of records from the backend
1387  * in one operation: To save some trips in and out of the event-handler,
1388  * and to simplify the interface to pack_records. At any rate, asynch
1389  * operation is more fun in operations that have an unpredictable execution
1390  * speed - which is normally more true for search than for present.
1391  */
1392 static Z_APDU *process_presentRequest(association *assoc, request *reqb,
1393     int *fd)
1394 {
1395     Z_PresentRequest *req = reqb->request->u.presentRequest;
1396     oident *prefformat;
1397     oid_value form;
1398     Z_APDU *apdu;
1399     Z_PresentResponse *resp;
1400     int *presst;
1401     int *next;
1402     int *num;
1403
1404     logf(LOG_LOG, "Got PresentRequest.");
1405
1406     if (!(prefformat = oid_getentbyoid(req->preferredRecordSyntax)) ||
1407         prefformat->oclass != CLASS_RECSYN)
1408         form = VAL_NONE;
1409     else
1410         form = prefformat->value;
1411     if (assoc->bend_present)
1412     {
1413         bend_present_rr *bprr = (bend_present_rr *)nmem_malloc (reqb->request_mem, sizeof(*bprr));
1414         bprr->setname = req->resultSetId;
1415         bprr->start = *req->resultSetStartPoint;
1416         bprr->number = *req->numberOfRecordsRequested;
1417         bprr->format = form;
1418         bprr->comp = req->recordComposition;
1419         bprr->stream = assoc->encode;
1420         bprr->request = reqb;
1421         bprr->association = assoc;
1422         bprr->errcode = 0;
1423         bprr->errstring = NULL;
1424         ((int (*)(void *, bend_present_rr *))(*assoc->bend_present))(assoc->backend, bprr);
1425
1426         if (!bprr->request)
1427             return 0;
1428     }
1429     apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1430     resp = (Z_PresentResponse *)odr_malloc (assoc->encode, sizeof(*resp));
1431     presst = (int *)odr_malloc (assoc->encode, sizeof(*presst));
1432     next = (int *)odr_malloc (assoc->encode, sizeof(*next));
1433     num = (int *)odr_malloc (assoc->encode, sizeof(*num));
1434     *presst = 0;
1435     *next = 0;
1436     *num = *req->numberOfRecordsRequested;
1437
1438     apdu->which = Z_APDU_presentResponse;
1439     apdu->u.presentResponse = resp;
1440     resp->referenceId = req->referenceId;
1441     resp->otherInfo = 0;
1442
1443     resp->records =
1444         pack_records(assoc, req->resultSetId, *req->resultSetStartPoint,
1445                      num, req->recordComposition, next, presst, form);
1446     if (!resp->records)
1447         return 0;
1448     resp->numberOfRecordsReturned = num;
1449     resp->presentStatus = presst;
1450     resp->nextResultSetPosition = next;
1451
1452     return apdu;
1453 }
1454
1455 /*
1456  * Scan was implemented rather in a hurry, and with support for only the basic
1457  * elements of the service in the backend API. Suggestions are welcome.
1458  */
1459 static Z_APDU *process_scanRequest(association *assoc, request *reqb, int *fd)
1460 {
1461     Z_ScanRequest *req = reqb->request->u.scanRequest;
1462     Z_APDU *apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1463     Z_ScanResponse *res = (Z_ScanResponse *)odr_malloc (assoc->encode, sizeof(*res));
1464     int *scanStatus = (int *)odr_malloc (assoc->encode, sizeof(*scanStatus));
1465     int *numberOfEntriesReturned =
1466          (int *)odr_malloc (assoc->encode, sizeof(*numberOfEntriesReturned));
1467     Z_ListEntries *ents = (Z_ListEntries *)odr_malloc (assoc->encode, sizeof(*ents));
1468     Z_DiagRecs *diagrecs_p = NULL;
1469     oident *attent;
1470     bend_scanrequest srq;
1471     bend_scanresult *srs;
1472     oident *attset;
1473
1474     logf(LOG_LOG, "Got ScanRequest");
1475     *scanStatus = Z_Scan_failure;
1476     *numberOfEntriesReturned = 0;
1477
1478     apdu->which = Z_APDU_scanResponse;
1479     apdu->u.scanResponse = res;
1480     res->referenceId = req->referenceId;
1481     res->stepSize = 0;
1482     res->scanStatus = scanStatus;
1483     res->numberOfEntriesReturned = numberOfEntriesReturned;
1484     res->positionOfTerm = 0;
1485     res->entries = ents;
1486     ents->num_entries = 0;
1487     ents->entries = NULL;
1488     ents->num_nonsurrogateDiagnostics = 0;
1489     ents->nonsurrogateDiagnostics = NULL;
1490     res->attributeSet = 0;
1491     res->otherInfo = 0;
1492
1493     if (req->attributeSet && (!(attent = oid_getentbyoid(req->attributeSet)) ||
1494                               attent->oclass != CLASS_ATTSET
1495                               || attent->value != VAL_BIB1))
1496         diagrecs_p = diagrecs(assoc, 121, 0);
1497     else if (req->stepSize && *req->stepSize > 0)
1498         diagrecs_p = diagrecs(assoc, 205, 0);
1499     else
1500     {
1501         if (req->databaseNames)
1502         {
1503             int i;
1504             for (i = 0; i < req->num_databaseNames; i++)
1505                 logf (LOG_LOG, "Database '%s'", req->databaseNames[i]);
1506         }
1507         srq.num_bases = req->num_databaseNames;
1508         srq.basenames = req->databaseNames;
1509         srq.num_entries = *req->numberOfTermsRequested;
1510         srq.term = req->termListAndStartPoint;
1511         srq.stream = assoc->encode;
1512         if (!(attset = oid_getentbyoid(req->attributeSet)) ||
1513             attset->oclass != CLASS_RECSYN)
1514             srq.attributeset = VAL_NONE;
1515         else
1516             srq.attributeset = attset->value;
1517         log_scan_term (req->termListAndStartPoint, attset->value);
1518         srq.term_position = req->preferredPositionInResponse ?
1519             *req->preferredPositionInResponse : 1;
1520         if (!(srs = bend_scan(assoc->backend, &srq, 0)))
1521             diagrecs_p = diagrecs(assoc, 2, 0);
1522         else if (srs->errcode)
1523             diagrecs_p = diagrecs(assoc, srs->errcode, srs->errstring);
1524         else
1525         {
1526             int i;
1527             Z_Entry **tab = (Z_Entry **)
1528                 odr_malloc (assoc->encode, sizeof(*tab) * srs->num_entries);
1529
1530             if (srs->status == BEND_SCAN_PARTIAL)
1531                 *scanStatus = Z_Scan_partial_5;
1532             else
1533                 *scanStatus = Z_Scan_success;
1534             ents->entries = tab;
1535             ents->num_entries = srs->num_entries;
1536             res->numberOfEntriesReturned = &ents->num_entries;
1537             res->positionOfTerm = &srs->term_position;
1538             for (i = 0; i < srs->num_entries; i++)
1539             {
1540                 Z_Entry *e;
1541                 Z_TermInfo *t;
1542                 Odr_oct *o;
1543
1544                 tab[i] = e = (Z_Entry *)odr_malloc(assoc->encode, sizeof(*e));
1545                 if (srs->entries[i].occurrences >= 0)
1546                 {
1547                     e->which = Z_Entry_termInfo;
1548                     e->u.termInfo = t = (Z_TermInfo *)
1549                         odr_malloc(assoc->encode, sizeof(*t));
1550                     t->suggestedAttributes = 0;
1551                     t->displayTerm = 0;
1552                     t->alternativeTerm = 0;
1553                     t->byAttributes = 0;
1554                     t->otherTermInfo = 0;
1555                     t->globalOccurrences = &srs->entries[i].occurrences;
1556                     t->term = (Z_Term *)
1557                         odr_malloc(assoc->encode, sizeof(*t->term));
1558                     t->term->which = Z_Term_general;
1559                     t->term->u.general = o =
1560                         (Odr_oct *)odr_malloc(assoc->encode, sizeof(Odr_oct));
1561                     o->buf = (unsigned char *)
1562                         odr_malloc(assoc->encode, o->len = o->size =
1563                                    strlen(srs->entries[i].term));
1564                     memcpy(o->buf, srs->entries[i].term, o->len);
1565                     logf(LOG_DEBUG, "  term #%d: '%s' (%d)", i,
1566                          srs->entries[i].term, srs->entries[i].occurrences);
1567                 }
1568                 else
1569                 {
1570                     Z_DiagRecs *drecs = diagrecs (assoc,
1571                                                   srs->entries[i].errcode,
1572                                                   srs->entries[i].errstring);
1573                     assert (drecs->num_diagRecs == 1);
1574                     e->which = Z_Entry_surrogateDiagnostic;
1575                     assert (drecs->diagRecs[0]);
1576                     e->u.surrogateDiagnostic = drecs->diagRecs[0];
1577                 }
1578             }
1579         }
1580     }
1581     if (diagrecs_p)
1582     {
1583         ents->num_nonsurrogateDiagnostics = diagrecs_p->num_diagRecs;
1584         ents->nonsurrogateDiagnostics = diagrecs_p->diagRecs;
1585     }
1586     return apdu;
1587 }
1588
1589 static Z_APDU *process_sortRequest(association *assoc, request *reqb,
1590     int *fd)
1591 {
1592     Z_SortRequest *req = reqb->request->u.sortRequest;
1593     Z_SortResponse *res = (Z_SortResponse *)odr_malloc (assoc->encode, sizeof(*res));
1594     bend_sort_rr *bsrr = (bend_sort_rr *)odr_malloc (assoc->encode, sizeof(*bsrr));
1595
1596     Z_APDU *apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1597
1598     logf(LOG_LOG, "Got SortRequest.");
1599
1600 #ifdef ASN_COMPILED
1601     bsrr->num_input_setnames = req->num_inputResultSetNames;
1602     bsrr->input_setnames = req->inputResultSetNames;
1603 #else
1604     bsrr->num_input_setnames = req->inputResultSetNames->num_strings;
1605     bsrr->input_setnames = req->inputResultSetNames->strings;
1606 #endif
1607     bsrr->output_setname = req->sortedResultSetName;
1608     bsrr->sort_sequence = req->sortSequence;
1609     bsrr->stream = assoc->encode;
1610
1611     bsrr->sort_status = Z_SortStatus_failure;
1612     bsrr->errcode = 0;
1613     bsrr->errstring = 0;
1614
1615     ((int (*)(void *, bend_sort_rr *))(*assoc->bend_sort))(assoc->backend, bsrr);
1616
1617     res->referenceId = req->referenceId;
1618     res->sortStatus = (int *)odr_malloc (assoc->encode, sizeof(*res->sortStatus));
1619     *res->sortStatus = bsrr->sort_status;
1620     res->resultSetStatus = 0;
1621     if (bsrr->errcode)
1622     {
1623         Z_DiagRecs *dr = diagrecs (assoc, bsrr->errcode, bsrr->errstring);
1624 #ifdef ASN_COMPILED
1625         res->diagnostics = dr->diagRecs;
1626         res->num_diagnostics = dr->num_diagRecs;
1627 #else
1628         res->diagnostics = dr;
1629 #endif
1630     }
1631     else
1632     {
1633 #ifdef ASN_COMPILED
1634         res->num_diagnostics = 0;
1635 #endif
1636         res->diagnostics = 0;
1637     }
1638     res->otherInfo = 0;
1639
1640     apdu->which = Z_APDU_sortResponse;
1641     apdu->u.sortResponse = res;
1642     return apdu;
1643 }
1644
1645 static Z_APDU *process_deleteRequest(association *assoc, request *reqb,
1646     int *fd)
1647 {
1648     Z_DeleteResultSetRequest *req = reqb->request->u.deleteResultSetRequest;
1649     Z_DeleteResultSetResponse *res = (Z_DeleteResultSetResponse *)
1650         odr_malloc (assoc->encode, sizeof(*res));
1651     bend_delete_rr *bdrr = (bend_delete_rr *)
1652         odr_malloc (assoc->encode, sizeof(*bdrr));
1653     Z_APDU *apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1654
1655     logf(LOG_LOG, "Got DeleteRequest.");
1656
1657     bdrr->num_setnames = req->num_resultSetList;
1658     bdrr->setnames = req->resultSetList;
1659     bdrr->stream = assoc->encode;
1660     bdrr->function = *req->deleteFunction;
1661
1662     ((int (*)(void *, bend_delete_rr *))
1663      (*assoc->bend_delete))(assoc->backend, bdrr);
1664
1665     res->referenceId = req->referenceId;
1666
1667     res->deleteOperationStatus = (int *)
1668         odr_malloc (assoc->encode, sizeof(*res->deleteOperationStatus));
1669     *res->deleteOperationStatus = bdrr->delete_status;
1670
1671     res->deleteListStatuses = 0;
1672     res->numberNotDeleted = 0;
1673     res->bulkStatuses = 0;
1674     res->deleteMessage = 0;
1675     res->otherInfo = 0;
1676
1677     apdu->which = Z_APDU_deleteResultSetResponse;
1678     apdu->u.deleteResultSetResponse = res;
1679     return apdu;
1680 }
1681
1682 static void process_close(association *assoc, request *reqb)
1683 {
1684     Z_Close *req = reqb->request->u.close;
1685     static char *reasons[] =
1686     {
1687         "finished",
1688         "shutdown",
1689         "systemProblem",
1690         "costLimit",
1691         "resources",
1692         "securityViolation",
1693         "protocolError",
1694         "lackOfActivity",
1695         "peerAbort",
1696         "unspecified"
1697     };
1698
1699     logf(LOG_LOG, "Got Close, reason %s, message %s",
1700         reasons[*req->closeReason], req->diagnosticInformation ?
1701         req->diagnosticInformation : "NULL");
1702     if (assoc->version < 3) /* to make do_force respond with close */
1703         assoc->version = 3;
1704     do_close_req(assoc, Z_Close_finished, "Association terminated by client",
1705                  reqb);
1706 }
1707
1708 void save_referenceId (request *reqb, Z_ReferenceId *refid)
1709 {
1710     if (refid)
1711     {
1712         reqb->len_refid = refid->len;
1713         reqb->refid = (char *)nmem_malloc (reqb->request_mem, refid->len);
1714         memcpy (reqb->refid, refid->buf, refid->len);
1715     }
1716     else
1717     {
1718         reqb->len_refid = 0;
1719         reqb->refid = NULL;
1720     }
1721 }
1722
1723 void bend_request_send (bend_association a, bend_request req, Z_APDU *res)
1724 {
1725     process_response (a, req, res);
1726 }
1727
1728 bend_request bend_request_mk (bend_association a)
1729 {
1730     request *nreq = request_get (&a->outgoing);
1731     nreq->request_mem = nmem_create ();
1732     return nreq;
1733 }
1734
1735 Z_ReferenceId *bend_request_getid (ODR odr, bend_request req)
1736 {
1737     Z_ReferenceId *id;
1738     if (!req->refid)
1739         return 0;
1740     id = (Odr_oct *)odr_malloc (odr, sizeof(*odr));
1741     id->buf = (unsigned char *)odr_malloc (odr, req->len_refid);
1742     id->len = id->size = req->len_refid;
1743     memcpy (id->buf, req->refid, req->len_refid);
1744     return id;
1745 }
1746
1747 void bend_request_destroy (bend_request *req)
1748 {
1749     nmem_destroy((*req)->request_mem);
1750     request_release(*req);
1751     *req = NULL;
1752 }
1753
1754 int bend_backend_respond (bend_association a, bend_request req)
1755 {
1756     return process_request (a, req);
1757 }
1758
1759 void bend_request_setdata(bend_request r, void *p)
1760 {
1761     r->clientData = p;
1762 }
1763
1764 void *bend_request_getdata(bend_request r)
1765 {
1766     return r->clientData;
1767 }
1768
1769 /* Chas: Added in from DALI */
1770 static Z_APDU *process_ESRequest(association *assoc, request *reqb, int *fd)
1771 {
1772     bend_esrequest_rr esrequest;
1773
1774     Z_ExtendedServicesRequest *req = reqb->request->u.extendedServicesRequest;
1775     Z_APDU *apdu = zget_APDU(assoc->encode, Z_APDU_extendedServicesResponse);
1776
1777     Z_ExtendedServicesResponse *resp = apdu->u.extendedServicesResponse;
1778
1779     logf(LOG_DEBUG,"inside Process esRequest");
1780
1781     esrequest.esr = reqb->request->u.extendedServicesRequest;
1782     esrequest.stream = assoc->encode;
1783     esrequest.errcode = 0;
1784     esrequest.errstring = NULL;
1785     esrequest.request = reqb;
1786     esrequest.association = assoc;
1787
1788     ((int (*)(void *, bend_esrequest_rr *))(*assoc->bend_esrequest))(assoc->backend,
1789                                                                    &esrequest);
1790
1791     /* If the response is being delayed, return NULL */
1792     if (esrequest.request == NULL)
1793         return(NULL);
1794
1795     resp->referenceId = req->referenceId;
1796
1797     if ( esrequest.errcode == 0 )
1798     {
1799         /* Backend service indicates request will be processed */
1800         logf(LOG_DEBUG,"Request will be processed...Good !");
1801         *resp->operationStatus = Z_ExtendedServicesResponse_done;
1802     }
1803     else
1804     {
1805         /* Backend indicates error, request will not be processed */
1806         logf(LOG_DEBUG,"Request will not be processed...BAD !");
1807         *resp->operationStatus = Z_ExtendedServicesResponse_failure;
1808     }
1809     /* Do something with the members of bend_extendedservice */
1810
1811     logf(LOG_DEBUG,"Send the result apdu");
1812
1813     return apdu;
1814 }
1815
1816 /* Chas: End of addition from DALI */