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