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 1.91  1999-06-01 14:29:12  adam
   8  * Work on Extended Services.
   9  *
  10  * Revision 1.90  1999/05/27 13:02:20  adam
  11  * Assigned OID for old DB Update (VAL_DBUPDATE0).
  12  *
  13  * Revision 1.89  1999/05/26 15:24:26  adam
  14  * Fixed minor bugs regarding DB Update (introduced by previous commit).
  15  *
  16  * Revision 1.88  1999/04/20 09:56:48  adam
  17  * Added 'name' paramter to encoder/decoder routines (typedef Odr_fun).
  18  * Modified all encoders/decoders to reflect this change.
  19  *
  20  * Revision 1.87  1999/03/31 11:18:25  adam
  21  * Implemented odr_strdup. Added Reference ID to backend server API.
  22  *
  23  * Revision 1.86  1999/02/02 13:57:38  adam
  24  * Uses preprocessor define WIN32 instead of WINDOWS to build code
  25  * for Microsoft WIN32.
  26  *
  27  * Revision 1.85  1998/11/17 09:52:59  adam
  28  * Fixed minor bug (introduced by previous commit).
  29  *
  30  * Revision 1.84  1998/11/16 16:02:32  adam
  31  * Added loggin utilies, log_rpn_query and log_scan_term. These used
  32  * to be part of Zebra.
  33  *
  34  * Revision 1.83  1998/11/03 10:09:36  adam
  35  * Fixed bug regarding YC.
  36  *
  37  * Revision 1.82  1998/10/20 14:00:30  quinn
  38  * Fixed Scan
  39  *
  40  * Revision 1.81  1998/10/13 16:12:24  adam
  41  * Added support for Surrogate Diagnostics for Scan Term entries.
  42  *
  43  * Revision 1.80  1998/09/02 12:41:53  adam
  44  * Added decode stream in bend search structures.
  45  *
  46  * Revision 1.79  1998/08/19 16:10:08  adam
  47  * Changed som member names of DeleteResultSetRequest/Response.
  48  *
  49  * Revision 1.78  1998/08/03 10:23:55  adam
  50  * Fixed bug regarding Options for Sort.
  51  *
  52  * Revision 1.77  1998/07/20 12:38:42  adam
  53  * Implemented delete result set service to server API.
  54  *
  55  * Revision 1.76  1998/05/27 16:57:07  adam
  56  * Support for surrogate diagnostic records added for bend_fetch.
  57  *
  58  * Revision 1.75  1998/05/18 10:13:07  adam
  59  * Fixed call to es_request handler - extra argument was passed.
  60  *
  61  * Revision 1.74  1998/03/31 15:13:20  adam
  62  * Development towards compiled ASN.1.
  63  *
  64  * Revision 1.73  1998/03/31 11:07:45  adam
  65  * Furhter work on UNIverse resource report.
  66  * Added Extended Services handling in frontend server.
  67  *
  68  * Revision 1.72  1998/02/11 11:53:35  adam
  69  * Changed code so that it compiles as C++.
  70  *
  71  * Revision 1.71  1998/02/10 11:03:57  adam
  72  * Added support for extended handlers in backend server interface.
  73  *
  74  * Revision 1.70  1998/01/29 13:15:35  adam
  75  * Implemented sort for the backend interface.
  76  *
  77  * Revision 1.69  1997/09/30 11:48:12  adam
  78  * Fixed bug introduced by previous commit.
  79  *
  80  * Revision 1.68  1997/09/29 13:18:59  adam
  81  * Added function, oid_ent_to_oid, to replace the function
  82  * oid_getoidbyent, which is not thread safe.
  83  *
  84  * Revision 1.67  1997/09/17 12:10:40  adam
  85  * YAZ version 1.4.
  86  *
  87  * Revision 1.66  1997/09/05 15:26:44  adam
  88  * Added ODR encode in search and scen bend request structures.
  89  * Fixed a few enums that caused trouble with C++.
  90  *
  91  * Revision 1.65  1997/09/01 08:53:01  adam
  92  * New windows NT/95 port using MSV5.0. The test server 'ztest' was
  93  * moved a separate directory. MSV5.0 project server.dsp created.
  94  * As an option, the server can now operate as an NT service.
  95  *
  96  * Revision 1.64  1997/04/30 08:52:11  quinn
  97  * Null
  98  *
  99  * Revision 1.63  1996/10/11  11:57:26  quinn
 100  * Smallish
 101  *
 102  * Revision 1.62  1996/07/06  19:58:35  quinn
 103  * System headerfiles gathered in yconfig
 104  *
 105  * Revision 1.61  1996/06/10  08:56:16  quinn
 106  * Work on Summary.
 107  *
 108  * Revision 1.60  1996/05/30  11:03:10  quinn
 109  * Fixed NextresultSetPosition bug fixed.
 110  *
 111  * Revision 1.59  1996/05/14  09:26:46  quinn
 112  * Added attribute set to scan backend
 113  *
 114  * Revision 1.58  1996/02/20  12:53:04  quinn
 115  * Chanes to SCAN
 116  *
 117  * Revision 1.57  1996/01/02  08:57:47  quinn
 118  * Changed enums in the ASN.1 .h files to #defines. Changed oident.class to oclass
 119  *
 120  * Revision 1.56  1995/12/14  11:09:57  quinn
 121  * Work on Explain
 122  *
 123  * Revision 1.55  1995/11/08  17:41:37  quinn
 124  * Smallish.
 125  *
 126  * Revision 1.54  1995/11/08  15:11:29  quinn
 127  * Log of close transmit.
 128  *
 129  * Revision 1.53  1995/11/01  13:54:58  quinn
 130  * Minor adjustments
 131  *
 132  * Revision 1.52  1995/11/01  12:19:13  quinn
 133  * Second attempt to fix same bug.
 134  *
 135  * Revision 1.50  1995/10/25  16:58:32  quinn
 136  * Simple.
 137  *
 138  * Revision 1.49  1995/10/16  13:51:53  quinn
 139  * Changes to provide Especs to the backend.
 140  *
 141  * Revision 1.48  1995/10/06  08:51:20  quinn
 142  * Added Write-buffer.
 143  *
 144  * Revision 1.47  1995/08/29  14:24:16  quinn
 145  * Added second half of close-handshake
 146  *
 147  * Revision 1.46  1995/08/29  11:17:58  quinn
 148  * Added code to receive close
 149  *
 150  * Revision 1.45  1995/08/21  09:11:00  quinn
 151  * Smallish fixes to suppport new formats.
 152  *
 153  * Revision 1.44  1995/08/17  12:45:25  quinn
 154  * Fixed minor problems with GRS-1. Added support in c&s.
 155  *
 156  * Revision 1.43  1995/08/15  12:00:31  quinn
 157  * Updated External
 158  *
 159  * Revision 1.42  1995/08/15  11:16:50  quinn
 160  *
 161  * Revision 1.41  1995/08/02  10:23:06  quinn
 162  * Smallish
 163  *
 164  * Revision 1.40  1995/07/31  14:34:26  quinn
 165  * Fixed bug in process_searchResponse (numberOfRecordsReturned).
 166  *
 167  * Revision 1.39  1995/06/27  13:21:00  quinn
 168  * SUTRS support
 169  *
 170  * Revision 1.38  1995/06/19  12:39:11  quinn
 171  * Fixed bug in timeout code. Added BER dumper.
 172  *
 173  * Revision 1.37  1995/06/16  13:16:14  quinn
 174  * Fixed Defaultdiagformat.
 175  *
 176  * Revision 1.36  1995/06/16  10:31:36  quinn
 177  * Added session timeout.
 178  *
 179  * Revision 1.35  1995/06/15  07:45:14  quinn
 180  * Moving to v3.
 181  *
 182  * Revision 1.34  1995/06/14  15:26:46  quinn
 183  * *** empty log message ***
 184  *
 185  * Revision 1.33  1995/06/06  14:57:05  quinn
 186  * Better diagnostics.
 187  *
 188  * Revision 1.32  1995/06/06  08:41:44  quinn
 189  * Better diagnostics.
 190  *
 191  * Revision 1.31  1995/06/06  08:15:37  quinn
 192  * Cosmetic.
 193  *
 194  * Revision 1.30  1995/06/05  10:53:32  quinn
 195  * Added a better SCAN.
 196  *
 197  * Revision 1.29  1995/06/01  11:25:03  quinn
 198  * Smallish.
 199  *
 200  * Revision 1.28  1995/06/01  11:21:01  quinn
 201  * Attempting to fix a bug in pack-records. replaced break with continue
 202  * for large records, according to standard.
 203  *
 204  * Revision 1.27  1995/05/29  08:12:06  quinn
 205  * Moved oid to util
 206  *
 207  * Revision 1.26  1995/05/18  13:02:12  quinn
 208  * Smallish.
 209  *
 210  * Revision 1.25  1995/05/17  08:42:26  quinn
 211  * Transfer auth info to backend. Allow backend to reject init gracefully.
 212  *
 213  * Revision 1.24  1995/05/16  08:51:04  quinn
 214  * License, documentation, and memory fixes
 215  *
 216  * Revision 1.23  1995/05/15  13:25:10  quinn
 217  * Fixed memory bug.
 218  *
 219  * Revision 1.22  1995/05/15  11:56:39  quinn
 220  * Asynchronous facilities. Restructuring of seshigh code.
 221  *
 222  * Revision 1.21  1995/05/02  08:53:19  quinn
 223  * Trying in vain to fix comm with ISODE
 224  *
 225  * Revision 1.20  1995/04/20  15:13:00  quinn
 226  * Cosmetic
 227  *
 228  * Revision 1.19  1995/04/18  08:15:34  quinn
 229  * Added dynamic memory allocation on encoding (whew). Code is now somewhat
 230  * neater. We'll make the same change for decoding one day.
 231  *
 232  * Revision 1.18  1995/04/17  11:28:25  quinn
 233  * Smallish
 234  *
 235  * Revision 1.17  1995/04/10  10:23:36  quinn
 236  * Some work to add scan and other things.
 237  *
 238  * Revision 1.16  1995/03/31  09:18:55  quinn
 239  * Added logging.
 240  *
 241  * Revision 1.15  1995/03/30  14:03:23  quinn
 242  * Added RFC1006 as separate library
 243  *
 244  * Revision 1.14  1995/03/30  12:18:17  quinn
 245  * Fixed bug.
 246  *
 247  * Revision 1.13  1995/03/30  09:09:24  quinn
 248  * Added state-handle and some support for asynchronous activities.
 249  *
 250  * Revision 1.12  1995/03/29  15:40:16  quinn
 251  * Ongoing work. Statserv is now dynamic by default
 252  *
 253  * Revision 1.11  1995/03/28  09:16:21  quinn
 254  * Added record packing to the search request
 255  *
 256  * Revision 1.10  1995/03/27  08:34:24  quinn
 257  * Added dynamic server functionality.
 258  * Released bindings to session.c (is now redundant)
 259  *
 260  * Revision 1.9  1995/03/22  15:01:26  quinn
 261  * Adjusting record packing.
 262  *
 263  * Revision 1.8  1995/03/22  10:13:21  quinn
 264  * Working on record packer
 265  *
 266  * Revision 1.7  1995/03/21  15:53:31  quinn
 267  * Little changes.
 268  *
 269  * Revision 1.6  1995/03/21  12:30:09  quinn
 270  * Beginning to add support for record packing.
 271  *
 272  * Revision 1.5  1995/03/17  10:44:13  quinn
 273  * Added catch of null-string in makediagrec
 274  *
 275  * Revision 1.4  1995/03/17  10:18:08  quinn
 276  * Added memory management.
 277  *
 278  * Revision 1.3  1995/03/16  17:42:39  quinn
 279  * Little changes
 280  *
 281  * Revision 1.2  1995/03/16  13:29:01  quinn
 282  * Partitioned server.
 283  *
 284  * Revision 1.1  1995/03/15  16:02:10  quinn
 285  * Modded session.c to seshigh.c
 286  *
 287  */
 288
 289 /*
 290  * Frontend server logic.
 291  *
 292  * This code receives incoming APDUs, and handles client requests by means
 293  * of the backend API.
 294  *
 295  * Some of the code is getting quite involved, compared to simpler servers -
 296  * primarily because it is asynchronous both in the communication with
 297  * the user and the backend. We think the complexity will pay off in
 298  * the form of greater flexibility when more asynchronous facilities
 299  * are implemented.
 300  *
 301  * Memory management has become somewhat involved. In the simple case, where
 302  * only one PDU is pending at a time, it will simply reuse the same memory,
 303  * once it has found its working size. When we enable multiple concurrent
 304  * operations, perhaps even with multiple parallel calls to the backend, it
 305  * will maintain a pool of buffers for encoding and decoding, trying to
 306  * minimize memory allocation/deallocation during normal operation.
 307  *
 308  * TODOs include (and will be done in order of public interest):
 309  *
 310  * Support for EXPLAIN - provide simple meta-database system.
 311  * Support for access control.
 312  * Support for resource control.
 313  * Support for extended services - primarily Item Order.
 314  * Rest of Z39.50-1994
 315  *
 316  */
 317
 318 #include <yconfig.h>
 319 #include <stdlib.h>
 320 #include <stdio.h>
 321 #ifdef WIN32
 322 #include <process.h>
 323 #else
 324 #include <unistd.h>
 325 #endif
 326 #include <assert.h>
 327
 328 #include <xmalloc.h>
 329 #include <comstack.h>
 330 #include "eventl.h"
 331 #include "session.h"
 332 #include <proto.h>
 333 #include <oid.h>
 334 #include <log.h>
 335 #include <logrpn.h>
 336 #include <statserv.h>
 337
 338 #include <backend.h>
 339
 340 static int process_request(association *assoc, request *req);
 341 void backend_response(IOCHAN i, int event);
 342 static int process_response(association *assoc, request *req, Z_APDU *res);
 343 static Z_APDU *process_initRequest(association *assoc, request *reqb);
 344 static Z_APDU *process_searchRequest(association *assoc, request *reqb,
 345     int *fd);
 346 static Z_APDU *response_searchRequest(association *assoc, request *reqb,
 347     bend_search_rr *bsrr, int *fd);
 348 static Z_APDU *process_presentRequest(association *assoc, request *reqb,
 349     int *fd);
 350 static Z_APDU *process_scanRequest(association *assoc, request *reqb, int *fd);
 351 static Z_APDU *process_sortRequest(association *assoc, request *reqb, int *fd);
 352 static void process_close(association *assoc, request *reqb);
 353 void save_referenceId (request *reqb, Z_ReferenceId *refid);
 354 static Z_APDU *process_deleteRequest(association *assoc, request *reqb,
 355     int *fd);
 356
 357 static FILE *apduf = 0; /* for use in static mode */
 358 static statserv_options_block *control_block = 0;
 359
 360 /* Chas: Added in from DALI */
 361 static Z_APDU *process_ESRequest(association *assoc, request *reqb, int *fd);
 362 /* Chas: End of addition from DALI */
 363
 364 /*
 365  * Create and initialize a new association-handle.
 366  *  channel  : iochannel for the current line.
 367  *  link     : communications channel.
 368  * Returns: 0 or a new association handle.
 369  */
 370 association *create_association(IOCHAN channel, COMSTACK link)
 371 {
 372     association *anew;
 373
 374     if (!control_block)
 375         control_block = statserv_getcontrol();
 376     if (!(anew = (association *)xmalloc(sizeof(*anew))))
 377         return 0;
 378     anew->client_chan = channel;
 379     anew->client_link = link;
 380     if (!(anew->decode = odr_createmem(ODR_DECODE)) ||
 381         !(anew->encode = odr_createmem(ODR_ENCODE)))
 382         return 0;
 383     if (*control_block->apdufile)
 384     {
 385         char filename[256];
 386         FILE *f;
 387
 388         strcpy(filename, control_block->apdufile);
 389         if (!(anew->print = odr_createmem(ODR_PRINT)))
 390             return 0;
 391         if (*control_block->apdufile != '-')
 392         {
 393             strcpy(filename, control_block->apdufile);
 394             if (!control_block->dynamic)
 395             {
 396                 if (!apduf)
 397                 {
 398                     if (!(apduf = fopen(filename, "w")))
 399                     {
 400                         logf(LOG_WARN|LOG_ERRNO, "%s", filename);
 401                         return 0;
 402                     }
 403                     setvbuf(apduf, 0, _IONBF, 0);
 404                 }
 405                 f = apduf;
 406             }
 407             else
 408             {
 409                 sprintf(filename + strlen(filename), ".%d", getpid());
 410                 if (!(f = fopen(filename, "w")))
 411                 {
 412                     logf(LOG_WARN|LOG_ERRNO, "%s", filename);
 413                     return 0;
 414                 }
 415                 setvbuf(f, 0, _IONBF, 0);
 416             }
 417             odr_setprint(anew->print, f);
 418         }
 419     }
 420     else
 421         anew->print = 0;
 422     anew->input_buffer = 0;
 423     anew->input_buffer_len = 0;
 424     anew->backend = 0;
 425     anew->state = ASSOC_NEW;
 426     request_initq(&anew->incoming);
 427     request_initq(&anew->outgoing);
 428     anew->proto = cs_getproto(link);
 429     return anew;
 430 }
 431
 432 /*
 433  * Free association and release resources.
 434  */
 435 void destroy_association(association *h)
 436 {
 437     odr_destroy(h->decode);
 438     odr_destroy(h->encode);
 439     if (h->print)
 440         odr_destroy(h->print);
 441     if (h->input_buffer)
 442     xfree(h->input_buffer);
 443     if (h->backend)
 444         bend_close(h->backend);
 445     while (request_deq(&h->incoming));
 446     while (request_deq(&h->outgoing));
 447     request_delq(&h->incoming);
 448     request_delq(&h->outgoing);
 449     xfree(h);
 450 }
 451
 452 static void do_close_req(association *a, int reason, char *message,
 453                          request *req)
 454 {
 455     Z_APDU apdu;
 456     Z_Close *cls = zget_Close(a->encode);
 457
 458     /* Purge request queue */
 459     while (request_deq(&a->incoming));
 460     while (request_deq(&a->outgoing));
 461     if (a->version >= 3)
 462     {
 463         logf(LOG_LOG, "Sending Close PDU, reason=%d, message=%s",
 464             reason, message ? message : "none");
 465         apdu.which = Z_APDU_close;
 466         apdu.u.close = cls;
 467         *cls->closeReason = reason;
 468         cls->diagnosticInformation = message;
 469         process_response(a, req, &apdu);
 470         iochan_settimeout(a->client_chan, 60);
 471     }
 472     else
 473     {
 474         logf(LOG_DEBUG, "v2 client. No Close PDU");
 475         iochan_setevent(a->client_chan, EVENT_TIMEOUT); /* force imm close */
 476     }
 477     a->state = ASSOC_DEAD;
 478 }
 479
 480 static void do_close(association *a, int reason, char *message)
 481 {
 482     do_close_req (a, reason, message, request_get(&a->outgoing));
 483 }
 484
 485 /*
 486  * This is where PDUs from the client are read and the further
 487  * processing is initiated. Flow of control moves down through the
 488  * various process_* functions below, until the encoded result comes back up
 489  * to the output handler in here.
 490  *
 491  *  h     : the I/O channel that has an outstanding event.
 492  *  event : the current outstanding event.
 493  */
 494 void ir_session(IOCHAN h, int event)
 495 {
 496     int res;
 497     association *assoc = (association *)iochan_getdata(h);
 498     COMSTACK conn = assoc->client_link;
 499     request *req;
 500
 501     assert(h && conn && assoc);
 502     if (event == EVENT_TIMEOUT)
 503     {
 504         if (assoc->state != ASSOC_UP)
 505         {
 506             logf(LOG_LOG, "Final timeout - closing connection.");
 507             cs_close(conn);
 508             destroy_association(assoc);
 509             iochan_destroy(h);
 510         }
 511         else
 512         {
 513             logf(LOG_LOG, "Session idle too long. Sending close.");
 514             do_close(assoc, Z_Close_lackOfActivity, 0);
 515         }
 516         return;
 517     }
 518     if (event & EVENT_INPUT || event & EVENT_WORK) /* input */
 519     {
 520         if (event & EVENT_INPUT)
 521         {
 522             logf(LOG_DEBUG, "ir_session (input)");
 523             assert(assoc && conn);
 524             /* We aren't speaking to this fellow */
 525             if (assoc->state == ASSOC_DEAD)
 526             {
 527                 logf(LOG_LOG, "Closed connection after reject");
 528                 cs_close(conn);
 529                 destroy_association(assoc);
 530                 iochan_destroy(h);
 531                 return;
 532             }
 533             if ((res = cs_get(conn, &assoc->input_buffer,
 534                 &assoc->input_buffer_len)) <= 0)
 535             {
 536                 logf(LOG_LOG, "Connection closed by client");
 537                 cs_close(conn);
 538                 destroy_association(assoc);
 539                 iochan_destroy(h);
 540                 return;
 541             }
 542             else if (res == 1) /* incomplete read - wait for more  */
 543                 return;
 544             if (cs_more(conn)) /* more stuff - call us again later, please */
 545                 iochan_setevent(h, EVENT_INPUT);
 546
 547             /* we got a complete PDU. Let's decode it */
 548             logf(LOG_DEBUG, "Got PDU, %d bytes", res);
 549             req = request_get(&assoc->incoming); /* get a new request structure */
 550             odr_reset(assoc->decode);
 551             odr_setbuf(assoc->decode, assoc->input_buffer, res, 0);
 552             if (!z_APDU(assoc->decode, &req->request, 0, 0))
 553             {
 554                 logf(LOG_LOG, "ODR error on incoming PDU: %s [near byte %d] ",
 555                     odr_errmsg(odr_geterror(assoc->decode)),
 556                     odr_offset(assoc->decode));
 557                 logf(LOG_LOG, "PDU dump:");
 558                 odr_dumpBER(log_file(), assoc->input_buffer, res);
 559                 do_close(assoc, Z_Close_protocolError, "Malformed package");
 560                 return;
 561             }
 562             req->request_mem = odr_extract_mem(assoc->decode);
 563             if (assoc->print && !z_APDU(assoc->print, &req->request, 0, 0))
 564             {
 565                 logf(LOG_WARN, "ODR print error: %s",
 566                     odr_errmsg(odr_geterror(assoc->print)));
 567                 odr_reset(assoc->print);
 568             }
 569             request_enq(&assoc->incoming, req);
 570         }
 571
 572         /* can we do something yet? */
 573         req = request_head(&assoc->incoming);
 574         if (req->state == REQUEST_IDLE)
 575         {
 576             request_deq(&assoc->incoming);
 577             if (process_request(assoc, req) < 0)
 578                 do_close_req(assoc, Z_Close_systemProblem, "Unknown error",
 579                              req);
 580         }
 581     }
 582     if (event & EVENT_OUTPUT)
 583     {
 584         request *req = request_head(&assoc->outgoing);
 585
 586         logf(LOG_DEBUG, "ir_session (output)");
 587         req->state = REQUEST_PENDING;
 588         switch (res = cs_put(conn, req->response, req->len_response))
 589         {
 590             case -1:
 591                 logf(LOG_LOG, "Connection closed by client");
 592                 cs_close(conn);
 593                 destroy_association(assoc);
 594                 iochan_destroy(h);
 595                 break;
 596             case 0: /* all sent - release the request structure */
 597                 logf(LOG_DEBUG, "Wrote PDU, %d bytes", req->len_response);
 598                 nmem_destroy(req->request_mem);
 599                 request_deq(&assoc->outgoing);
 600                 request_release(req);
 601                 if (!request_head(&assoc->outgoing))
 602                     iochan_clearflag(h, EVENT_OUTPUT);
 603                 break;
 604             /* value of 1 -- partial send -- is simply ignored */
 605         }
 606     }
 607     if (event & EVENT_EXCEPT)
 608     {
 609         logf(LOG_DEBUG, "ir_session (exception)");
 610         cs_close(conn);
 611         destroy_association(assoc);
 612         iochan_destroy(h);
 613     }
 614 }
 615
 616 /*
 617  * Initiate request processing.
 618  */
 619 static int process_request(association *assoc, request *req)
 620 {
 621     int fd = -1;
 622     Z_APDU *res;
 623     int retval;
 624
 625     assert(req && req->state == REQUEST_IDLE);
 626     switch (req->request->which)
 627     {
 628         case Z_APDU_initRequest:
 629             res = process_initRequest(assoc, req); break;
 630         case Z_APDU_searchRequest:
 631             res = process_searchRequest(assoc, req, &fd); break;
 632         case Z_APDU_presentRequest:
 633             res = process_presentRequest(assoc, req, &fd); break;
 634         case Z_APDU_scanRequest:
 635             res = process_scanRequest(assoc, req, &fd); break;
 636         case Z_APDU_extendedServicesRequest:
 637             if (assoc->bend_esrequest)
 638                 res = process_ESRequest(assoc, req, &fd);
 639             else
 640             {
 641                 logf(LOG_WARN, "Cannot handle EXTENDED SERVICES APDU");
 642                 return -1;
 643             }
 644             break;
 645         case Z_APDU_sortRequest:
 646             if (assoc->bend_sort)
 647                 res = process_sortRequest(assoc, req, &fd);
 648             else
 649             {
 650                 logf(LOG_WARN, "Cannot handle SORT APDU");
 651                 return -1;
 652             }
 653             break;
 654         case Z_APDU_close:
 655             process_close(assoc, req); return 0;
 656         case Z_APDU_deleteResultSetRequest:
 657             if (assoc->bend_delete)
 658                 res = process_deleteRequest(assoc, req, &fd);
 659             else
 660             {
 661                 logf (LOG_WARN, "Cannot handle Delete APDU");
 662                 return -1;
 663             }
 664             break;
 665         default:
 666             logf(LOG_WARN, "Bad APDU received");
 667             return -1;
 668     }
 669     if (res)
 670     {
 671         logf(LOG_DEBUG, "  result immediately available");
 672         retval = process_response(assoc, req, res);
 673     }
 674     else if (fd < 0)
 675     {
 676         logf(LOG_DEBUG, "  result unavailble");
 677         retval = 0;
 678     }
 679     else /* no result yet - one will be provided later */
 680     {
 681         IOCHAN chan;
 682
 683         /* Set up an I/O handler for the fd supplied by the backend */
 684
 685         logf(LOG_DEBUG, "   establishing handler for result");
 686         req->state = REQUEST_PENDING;
 687         if (!(chan = iochan_create(fd, backend_response, EVENT_INPUT)))
 688             abort();
 689         iochan_setdata(chan, assoc);
 690         retval = 0;
 691     }
 692     return retval;
 693 }
 694
 695 /*
 696  * Handle message from the backend.
 697  */
 698 void backend_response(IOCHAN i, int event)
 699 {
 700     association *assoc = (association *)iochan_getdata(i);
 701     request *req = request_head(&assoc->incoming);
 702     Z_APDU *res;
 703     int fd;
 704
 705     logf(LOG_DEBUG, "backend_response");
 706     assert(assoc && req && req->state != REQUEST_IDLE);
 707     /* determine what it is we're waiting for */
 708     switch (req->request->which)
 709     {
 710         case Z_APDU_searchRequest:
 711             res = response_searchRequest(assoc, req, 0, &fd); break;
 712 #if 0
 713         case Z_APDU_presentRequest:
 714             res = response_presentRequest(assoc, req, 0, &fd); break;
 715         case Z_APDU_scanRequest:
 716             res = response_scanRequest(assoc, req, 0, &fd); break;
 717 #endif
 718         default:
 719             logf(LOG_WARN, "Serious programmer's lapse or bug");
 720             abort();
 721     }
 722     if ((res && process_response(assoc, req, res) < 0) || fd < 0)
 723     {
 724         logf(LOG_LOG, "Fatal error when talking to backend");
 725         do_close(assoc, Z_Close_systemProblem, 0);
 726         iochan_destroy(i);
 727         return;
 728     }
 729     else if (!res) /* no result yet - try again later */
 730     {
 731         logf(LOG_DEBUG, "   no result yet");
 732         iochan_setfd(i, fd); /* in case fd has changed */
 733     }
 734 }
 735
 736 /*
 737  * Encode response, and transfer the request structure to the outgoing queue.
 738  */
 739 static int process_response(association *assoc, request *req, Z_APDU *res)
 740 {
 741     odr_setbuf(assoc->encode, req->response, req->size_response, 1);
 742     if (!z_APDU(assoc->encode, &res, 0, 0))
 743     {
 744         logf(LOG_WARN, "ODR error when encoding response: %s",
 745             odr_errmsg(odr_geterror(assoc->decode)));
 746         odr_reset(assoc->encode);
 747         return -1;
 748     }
 749     req->response = odr_getbuf(assoc->encode, &req->len_response,
 750         &req->size_response);
 751     odr_setbuf(assoc->encode, 0, 0, 0); /* don'txfree if we abort later */
 752     if (assoc->print && !z_APDU(assoc->print, &res, 0, 0))
 753     {
 754         logf(LOG_WARN, "ODR print error: %s",
 755             odr_errmsg(odr_geterror(assoc->print)));
 756         odr_reset(assoc->print);
 757     }
 758     odr_reset(assoc->encode);
 759     req->state = REQUEST_IDLE;
 760     request_enq(&assoc->outgoing, req);
 761     /* turn the work over to the ir_session handler */
 762     iochan_setflag(assoc->client_chan, EVENT_OUTPUT);
 763     /* Is there more work to be done? give that to the input handler too */
 764 #if 1
 765     if (request_head(&assoc->incoming))
 766     {
 767         logf (LOG_DEBUG, "more work to be done");
 768         iochan_setevent(assoc->client_chan, EVENT_WORK);
 769     }
 770 #endif
 771     return 0;
 772 }
 773
 774 /*
 775  * Handle init request.
 776  * At the moment, we don't check the options
 777  * anywhere else in the code - we just try not to do anything that would
 778  * break a naive client. We'll toss 'em into the association block when
 779  * we need them there.
 780  */
 781 static Z_APDU *process_initRequest(association *assoc, request *reqb)
 782 {
 783     Z_InitRequest *req = reqb->request->u.initRequest;
 784     Z_APDU *apdu = zget_APDU(assoc->encode, Z_APDU_initResponse);
 785     Z_InitResponse *resp = apdu->u.initResponse;
 786     bend_initrequest binitreq;
 787     bend_initresult *binitres;
 788     char options[100];
 789
 790     logf(LOG_LOG, "Got initRequest");
 791     if (req->implementationId)
 792         logf(LOG_LOG, "Id:        %s", req->implementationId);
 793     if (req->implementationName)
 794         logf(LOG_LOG, "Name:      %s", req->implementationName);
 795     if (req->implementationVersion)
 796         logf(LOG_LOG, "Version:   %s", req->implementationVersion);
 797
 798     binitreq.stream = assoc->encode;
 799     binitreq.configname = "default-config";
 800     binitreq.auth = req->idAuthentication;
 801     binitreq.referenceId = req->referenceId;
 802     binitreq.bend_sort = NULL;
 803     binitreq.bend_search = NULL;
 804     binitreq.bend_present = NULL;
 805     binitreq.bend_esrequest = NULL;
 806     binitreq.bend_delete = NULL;
 807     if (!(binitres = bend_init(&binitreq)))
 808     {
 809         logf(LOG_WARN, "Bad response from backend.");
 810         return 0;
 811     }
 812
 813     assoc->backend = binitres->handle;
 814     if ((assoc->bend_sort = (int (*)())binitreq.bend_sort))
 815         logf (LOG_DEBUG, "Sort handler installed");
 816     if ((assoc->bend_search = (int (*)())binitreq.bend_search))
 817         logf (LOG_DEBUG, "Search handler installed");
 818     if ((assoc->bend_present = (int (*)())binitreq.bend_present))
 819         logf (LOG_DEBUG, "Present handler installed");
 820     if ((assoc->bend_esrequest = (int (*)())binitreq.bend_esrequest))
 821         logf (LOG_DEBUG, "ESRequest handler installed");
 822     if ((assoc->bend_delete = (int (*)())binitreq.bend_delete))
 823         logf (LOG_DEBUG, "Delete handler installed");
 824
 825     resp->referenceId = req->referenceId;
 826     *options = '\0';
 827     /* let's tell the client what we can do */
 828     if (ODR_MASK_GET(req->options, Z_Options_search))
 829     {
 830         ODR_MASK_SET(resp->options, Z_Options_search);
 831         strcat(options, "srch");
 832     }
 833     if (ODR_MASK_GET(req->options, Z_Options_present))
 834     {
 835         ODR_MASK_SET(resp->options, Z_Options_present);
 836         strcat(options, " prst");
 837     }
 838     if (ODR_MASK_GET(req->options, Z_Options_delSet) && binitreq.bend_delete)
 839     {
 840         ODR_MASK_SET(resp->options, Z_Options_delSet);
 841         strcat(options, " del");
 842     }
 843     if (ODR_MASK_GET(req->options, Z_Options_extendedServices) &&
 844         binitreq.bend_esrequest)
 845     {
 846         ODR_MASK_SET(resp->options, Z_Options_extendedServices);
 847         strcat (options, " extendedServices");
 848     }
 849     if (ODR_MASK_GET(req->options, Z_Options_namedResultSets))
 850     {
 851         ODR_MASK_SET(resp->options, Z_Options_namedResultSets);
 852         strcat(options, " namedresults");
 853     }
 854     if (ODR_MASK_GET(req->options, Z_Options_scan))
 855     {
 856         ODR_MASK_SET(resp->options, Z_Options_scan);
 857         strcat(options, " scan");
 858     }
 859     if (ODR_MASK_GET(req->options, Z_Options_concurrentOperations))
 860     {
 861         ODR_MASK_SET(resp->options, Z_Options_concurrentOperations);
 862         strcat(options, " concurop");
 863     }
 864     if (ODR_MASK_GET(req->options, Z_Options_sort) && binitreq.bend_sort)
 865     {
 866         ODR_MASK_SET(resp->options, Z_Options_sort);
 867         strcat(options, " sort");
 868     }
 869     if (ODR_MASK_GET(req->protocolVersion, Z_ProtocolVersion_1))
 870     {
 871         ODR_MASK_SET(resp->protocolVersion, Z_ProtocolVersion_1);
 872         assoc->version = 2; /* 1 & 2 are equivalent */
 873     }
 874     if (ODR_MASK_GET(req->protocolVersion, Z_ProtocolVersion_2))
 875     {
 876         ODR_MASK_SET(resp->protocolVersion, Z_ProtocolVersion_2);
 877         assoc->version = 2;
 878     }
 879     if (ODR_MASK_GET(req->protocolVersion, Z_ProtocolVersion_3))
 880     {
 881         ODR_MASK_SET(resp->protocolVersion, Z_ProtocolVersion_3);
 882         assoc->version = 3;
 883     }
 884     logf(LOG_LOG, "Negotiated to v%d: %s", assoc->version, options);
 885     assoc->maximumRecordSize = *req->maximumRecordSize;
 886     if (assoc->maximumRecordSize > control_block->maxrecordsize)
 887         assoc->maximumRecordSize = control_block->maxrecordsize;
 888     assoc->preferredMessageSize = *req->preferredMessageSize;
 889     if (assoc->preferredMessageSize > assoc->maximumRecordSize)
 890         assoc->preferredMessageSize = assoc->maximumRecordSize;
 891     resp->preferredMessageSize = &assoc->preferredMessageSize;
 892     resp->maximumRecordSize = &assoc->maximumRecordSize;
 893     resp->implementationName = "Index Data/YAZ Generic Frontend Server";
 894     if (binitres->errcode)
 895     {
 896         logf(LOG_LOG, "Connection rejected by backend.");
 897         *resp->result = 0;
 898         assoc->state = ASSOC_DEAD;
 899     }
 900     else
 901         assoc->state = ASSOC_UP;
 902     return apdu;
 903 }
 904
 905 /*
 906  * These functions should be merged.
 907  */
 908
 909 static void set_addinfo (Z_DefaultDiagFormat *dr, char *addinfo)
 910 {
 911 #if ASN_COMPILED
 912     dr->which = Z_DefaultDiagFormat_v2Addinfo;
 913     dr->u.v2Addinfo = addinfo ? addinfo : "";
 914 #else
 915     dr->which = Z_DiagForm_v2AddInfo;
 916     dr->addinfo = addinfo ? addinfo : "";
 917 #endif
 918 }
 919
 920 /*
 921  * nonsurrogate diagnostic record.
 922  */
 923 static Z_Records *diagrec(association *assoc, int error, char *addinfo)
 924 {
 925     int oid[OID_SIZE];
 926     Z_Records *rec = (Z_Records *)
 927         odr_malloc (assoc->encode, sizeof(*rec));
 928     oident bib1;
 929     int *err = (int *)
 930         odr_malloc (assoc->encode, sizeof(*err));
 931     Z_DiagRec *drec = (Z_DiagRec *)
 932         odr_malloc (assoc->encode, sizeof(*drec));
 933     Z_DefaultDiagFormat *dr = (Z_DefaultDiagFormat *)
 934         odr_malloc (assoc->encode, sizeof(*dr));
 935
 936     bib1.proto = assoc->proto;
 937     bib1.oclass = CLASS_DIAGSET;
 938     bib1.value = VAL_BIB1;
 939
 940     logf(LOG_DEBUG, "Diagnostic: %d -- %s", error, addinfo ? addinfo :
 941         "NULL");
 942     *err = error;
 943     rec->which = Z_Records_NSD;
 944 #if ASN_COMPILED
 945     rec->u.nonSurrogateDiagnostic = dr;
 946 #else
 947     rec->u.nonSurrogateDiagnostic = drec;
 948     drec->which = Z_DiagRec_defaultFormat;
 949     drec->u.defaultFormat = dr;
 950 #endif
 951     dr->diagnosticSetId =
 952         odr_oiddup (assoc->encode, oid_ent_to_oid(&bib1, oid));
 953     dr->condition = err;
 954     set_addinfo (dr, addinfo);
 955     return rec;
 956 }
 957
 958 /*
 959  * surrogate diagnostic.
 960  */
 961 static Z_NamePlusRecord *surrogatediagrec(association *assoc, char *dbname,
 962                                           int error, char *addinfo)
 963 {
 964     int oid[OID_SIZE];
 965     Z_NamePlusRecord *rec = (Z_NamePlusRecord *)
 966         odr_malloc (assoc->encode, sizeof(*rec));
 967     int *err = (int *)odr_malloc (assoc->encode, sizeof(*err));
 968     oident bib1;
 969     Z_DiagRec *drec = (Z_DiagRec *)odr_malloc (assoc->encode, sizeof(*drec));
 970     Z_DefaultDiagFormat *dr = (Z_DefaultDiagFormat *)
 971         odr_malloc (assoc->encode, sizeof(*dr));
 972
 973     bib1.proto = assoc->proto;
 974     bib1.oclass = CLASS_DIAGSET;
 975     bib1.value = VAL_BIB1;
 976
 977     logf(LOG_DEBUG, "SurrogateDiagnotic: %d -- %s", error, addinfo);
 978     *err = error;
 979     rec->databaseName = dbname;
 980     rec->which = Z_NamePlusRecord_surrogateDiagnostic;
 981     rec->u.surrogateDiagnostic = drec;
 982     drec->which = Z_DiagRec_defaultFormat;
 983     drec->u.defaultFormat = dr;
 984     dr->diagnosticSetId = odr_oiddup (assoc->encode,
 985                                       oid_ent_to_oid(&bib1, oid));
 986     dr->condition = err;
 987     set_addinfo (dr, addinfo);
 988
 989     return rec;
 990 }
 991
 992 /*
 993  * multiple nonsurrogate diagnostics.
 994  */
 995 static Z_DiagRecs *diagrecs(association *assoc, int error, char *addinfo)
 996 {
 997     int oid[OID_SIZE];
 998     Z_DiagRecs *recs = (Z_DiagRecs *)odr_malloc (assoc->encode, sizeof(*recs));
 999     int *err = (int *)odr_malloc (assoc->encode, sizeof(*err));
1000     oident bib1;
1001     Z_DiagRec **recp = (Z_DiagRec **)odr_malloc (assoc->encode, sizeof(*recp));
1002     Z_DiagRec *drec = (Z_DiagRec *)odr_malloc (assoc->encode, sizeof(*drec));
1003     Z_DefaultDiagFormat *rec = (Z_DefaultDiagFormat *)odr_malloc (assoc->encode, sizeof(*rec));
1004
1005     logf(LOG_DEBUG, "DiagRecs: %d -- %s", error, addinfo ? addinfo : "");
1006     bib1.proto = assoc->proto;
1007     bib1.oclass = CLASS_DIAGSET;
1008     bib1.value = VAL_BIB1;
1009
1010     *err = error;
1011     recs->num_diagRecs = 1;
1012     recs->diagRecs = recp;
1013     recp[0] = drec;
1014     drec->which = Z_DiagRec_defaultFormat;
1015     drec->u.defaultFormat = rec;
1016
1017     rec->diagnosticSetId = odr_oiddup (assoc->encode,
1018                                       oid_ent_to_oid(&bib1, oid));
1019     rec->condition = err;
1020
1021 #ifdef ASN_COMPILED
1022     rec->which = Z_DefaultDiagFormat_v2Addinfo;
1023     rec->u.v2Addinfo = addinfo ? addinfo : "";
1024 #else
1025     rec->which = Z_DiagForm_v2AddInfo;
1026     rec->addinfo = addinfo ? addinfo : "";
1027 #endif
1028     return recs;
1029 }
1030
1031 static Z_Records *pack_records(association *a, char *setname, int start,
1032                                 int *num, Z_RecordComposition *comp,
1033                                 int *next, int *pres, oid_value format,
1034                                 Z_ReferenceId *referenceId)
1035 {
1036     int recno, total_length = 0, toget = *num, dumped_records = 0;
1037     Z_Records *records =
1038         (Z_Records *) odr_malloc (a->encode, sizeof(*records));
1039     Z_NamePlusRecordList *reclist =
1040         (Z_NamePlusRecordList *) odr_malloc (a->encode, sizeof(*reclist));
1041     Z_NamePlusRecord **list =
1042         (Z_NamePlusRecord **) odr_malloc (a->encode, sizeof(*list) * toget);
1043
1044     records->which = Z_Records_DBOSD;
1045     records->u.databaseOrSurDiagnostics = reclist;
1046     reclist->num_records = 0;
1047     reclist->records = list;
1048     *pres = Z_PRES_SUCCESS;
1049     *num = 0;
1050     *next = 0;
1051
1052     logf(LOG_LOG, "Request to pack %d+%d", start, toget);
1053     logf(LOG_DEBUG, "pms=%d, mrs=%d", a->preferredMessageSize,
1054         a->maximumRecordSize);
1055     for (recno = start; reclist->num_records < toget; recno++)
1056     {
1057         bend_fetchrequest freq;
1058         bend_fetchresult *fres;
1059         Z_NamePlusRecord *thisrec;
1060         int this_length = 0;
1061         /*
1062          * we get the number of bytes allocated on the stream before any
1063          * allocation done by the backend - this should give us a reasonable
1064          * idea of the total size of the data so far.
1065          */
1066         total_length = odr_total(a->encode) - dumped_records;
1067         freq.setname = setname;
1068         freq.number = recno;
1069         freq.comp = comp;
1070         freq.format = format;
1071         freq.stream = a->encode;
1072         freq.surrogate_flag = 0;
1073         freq.referenceId = referenceId;
1074         if (!(fres = bend_fetch(a->backend, &freq, 0)))
1075         {
1076             *pres = Z_PRES_FAILURE;
1077             return diagrec(a, 2, "Backend interface problem");
1078         }
1079         /* backend should be able to signal whether error is system-wide
1080            or only pertaining to current record */
1081         if (fres->errcode)
1082         {
1083             if (!freq.surrogate_flag)
1084             {
1085                 *pres = Z_PRES_FAILURE;
1086                 return diagrec(a, fres->errcode, fres->errstring);
1087             }
1088             reclist->records[reclist->num_records] =
1089                 surrogatediagrec(a, fres->basename, fres->errcode,
1090                                  fres->errstring);
1091             reclist->num_records++;
1092             *next = fres->last_in_set ? 0 : recno + 1;
1093             continue;
1094         }
1095         if (fres->len >= 0)
1096             this_length = fres->len;
1097         else
1098             this_length = odr_total(a->encode) - total_length;
1099         logf(LOG_DEBUG, "  fetched record, len=%d, total=%d",
1100             this_length, total_length);
1101         if (this_length + total_length > a->preferredMessageSize)
1102         {
1103             /* record is small enough, really */
1104             if (this_length <= a->preferredMessageSize)
1105             {
1106                 logf(LOG_DEBUG, "  Dropped last normal-sized record");
1107                 *pres = Z_PRES_PARTIAL_2;
1108                 break;
1109             }
1110             /* record can only be fetched by itself */
1111             if (this_length < a->maximumRecordSize)
1112             {
1113                 logf(LOG_DEBUG, "  Record > prefmsgsz");
1114                 if (toget > 1)
1115                 {
1116                     logf(LOG_DEBUG, "  Dropped it");
1117                     reclist->records[reclist->num_records] =
1118                          surrogatediagrec(a, fres->basename, 16, 0);
1119                     reclist->num_records++;
1120                     *next = fres->last_in_set ? 0 : recno + 1;
1121                     dumped_records += this_length;
1122                     continue;
1123                 }
1124             }
1125             else /* too big entirely */
1126             {
1127                 logf(LOG_DEBUG, "Record > maxrcdsz");
1128                 reclist->records[reclist->num_records] =
1129                     surrogatediagrec(a, fres->basename, 17, 0);
1130                 reclist->num_records++;
1131                 *next = fres->last_in_set ? 0 : recno + 1;
1132                 dumped_records += this_length;
1133                 continue;
1134             }
1135         }
1136
1137         if (!(thisrec = (Z_NamePlusRecord *)
1138               odr_malloc(a->encode, sizeof(*thisrec))))
1139             return 0;
1140         if (!(thisrec->databaseName = (char *)odr_malloc(a->encode,
1141             strlen(fres->basename) + 1)))
1142             return 0;
1143         strcpy(thisrec->databaseName, fres->basename);
1144         thisrec->which = Z_NamePlusRecord_databaseRecord;
1145         thisrec->u.databaseRecord = z_ext_record(a->encode, fres->format,
1146                                                  fres->record, fres->len);
1147         if (!thisrec->u.databaseRecord)
1148             return 0;
1149         reclist->records[reclist->num_records] = thisrec;
1150         reclist->num_records++;
1151         *next = fres->last_in_set ? 0 : recno + 1;
1152     }
1153     *num = reclist->num_records;
1154     return records;
1155 }
1156
1157 static Z_APDU *process_searchRequest(association *assoc, request *reqb,
1158     int *fd)
1159 {
1160     Z_SearchRequest *req = reqb->request->u.searchRequest;
1161     bend_search_rr *bsrr =
1162         (bend_search_rr *)nmem_malloc (reqb->request_mem, sizeof(*bsrr));
1163
1164     logf(LOG_LOG, "Got SearchRequest.");
1165     bsrr->fd = fd;
1166     bsrr->request = reqb;
1167     bsrr->association = assoc;
1168     bsrr->referenceId = req->referenceId;
1169     save_referenceId (reqb, bsrr->referenceId);
1170
1171     logf (LOG_LOG, "ResultSet '%s'", req->resultSetName);
1172     if (req->databaseNames)
1173     {
1174         int i;
1175         for (i = 0; i < req->num_databaseNames; i++)
1176             logf (LOG_LOG, "Database '%s'", req->databaseNames[i]);
1177     }
1178     switch (req->query->which)
1179     {
1180     case Z_Query_type_1: case Z_Query_type_101:
1181         log_rpn_query (req->query->u.type_1);
1182     }
1183     if (assoc->bend_search)
1184     {
1185         bsrr->setname = req->resultSetName;
1186         bsrr->replace_set = *req->replaceIndicator;
1187         bsrr->num_bases = req->num_databaseNames;
1188         bsrr->basenames = req->databaseNames;
1189         bsrr->query = req->query;
1190         bsrr->stream = assoc->encode;
1191         bsrr->decode = assoc->decode;
1192         bsrr->errcode = 0;
1193         bsrr->hits = 0;
1194         bsrr->errstring = NULL;
1195         ((int (*)(void *, bend_search_rr *))(assoc->bend_search))
1196             (assoc->backend, bsrr);
1197         if (!bsrr->request)
1198             return 0;
1199     }
1200     else
1201     {
1202         bend_searchrequest bsrq;
1203         bend_searchresult *bsrt;
1204
1205         bsrq.setname = req->resultSetName;
1206         bsrq.replace_set = *req->replaceIndicator;
1207         bsrq.num_bases = req->num_databaseNames;
1208         bsrq.basenames = req->databaseNames;
1209         bsrq.query = req->query;
1210         bsrq.referenceId = req->referenceId;
1211         bsrq.stream = assoc->encode;
1212         bsrq.decode = assoc->decode;
1213         if (!(bsrt = bend_search (assoc->backend, &bsrq, fd)))
1214             return 0;
1215         bsrr->hits = bsrt->hits;
1216         bsrr->errcode = bsrt->errcode;
1217         bsrr->errstring = bsrt->errstring;
1218     }
1219     return response_searchRequest(assoc, reqb, bsrr, fd);
1220 }
1221
1222 int bend_searchresponse(void *handle, bend_search_rr *bsrr) {return 0;}
1223
1224 /*
1225  * Prepare a searchresponse based on the backend results. We probably want
1226  * to look at making the fetching of records nonblocking as well, but
1227  * so far, we'll keep things simple.
1228  * If bsrt is null, that means we're called in response to a communications
1229  * event, and we'll have to get the response for ourselves.
1230  */
1231 static Z_APDU *response_searchRequest(association *assoc, request *reqb,
1232     bend_search_rr *bsrt, int *fd)
1233 {
1234     Z_SearchRequest *req = reqb->request->u.searchRequest;
1235     Z_APDU *apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1236     Z_SearchResponse *resp = (Z_SearchResponse *)
1237         odr_malloc (assoc->encode, sizeof(*resp));
1238     int *nulint = (int *)odr_malloc (assoc->encode, sizeof(*nulint));
1239     bool_t *sr = (bool_t *)odr_malloc (assoc->encode, sizeof(*sr));
1240     int *next = (int *)odr_malloc (assoc->encode, sizeof(*next));
1241     int *none = (int *)odr_malloc (assoc->encode, sizeof(*none));
1242
1243     *nulint = 0;
1244     *sr = 1;
1245     *next = 0;
1246     *none = Z_RES_NONE;
1247
1248     apdu->which = Z_APDU_searchResponse;
1249     apdu->u.searchResponse = resp;
1250     resp->referenceId = req->referenceId;
1251     resp->additionalSearchInfo = 0;
1252     resp->otherInfo = 0;
1253     *fd = -1;
1254     if (!bsrt && !bend_searchresponse(assoc->backend, bsrt))
1255     {
1256         logf(LOG_FATAL, "Bad result from backend");
1257         return 0;
1258     }
1259     else if (bsrt->errcode)
1260     {
1261         resp->records = diagrec(assoc, bsrt->errcode, bsrt->errstring);
1262         resp->resultCount = nulint;
1263         resp->numberOfRecordsReturned = nulint;
1264         resp->nextResultSetPosition = nulint;
1265         resp->searchStatus = nulint;
1266         resp->resultSetStatus = none;
1267         resp->presentStatus = 0;
1268     }
1269     else
1270     {
1271         int *toget = (int *)odr_malloc (assoc->encode, sizeof(*toget));
1272         int *presst = (int *)odr_malloc (assoc->encode, sizeof(*presst));
1273         Z_RecordComposition comp, *compp = 0;
1274
1275         *toget = 0;
1276         *presst = 0;
1277         resp->records = 0;
1278         resp->resultCount = &bsrt->hits;
1279
1280         comp.which = Z_RecordComp_simple;
1281         /* how many records does the user agent want, then? */
1282         if (bsrt->hits <= *req->smallSetUpperBound)
1283         {
1284             *toget = bsrt->hits;
1285             if ((comp.u.simple = req->smallSetElementSetNames))
1286                 compp = &comp;
1287         }
1288         else if (bsrt->hits < *req->largeSetLowerBound)
1289         {
1290             *toget = *req->mediumSetPresentNumber;
1291             if (*toget > bsrt->hits)
1292                 *toget = bsrt->hits;
1293             if ((comp.u.simple = req->mediumSetElementSetNames))
1294                 compp = &comp;
1295         }
1296         else
1297             *toget = 0;
1298
1299         if (*toget && !resp->records)
1300         {
1301             oident *prefformat;
1302             oid_value form;
1303
1304             if (!(prefformat = oid_getentbyoid(req->preferredRecordSyntax)) ||
1305                 prefformat->oclass != CLASS_RECSYN)
1306                 form = VAL_NONE;
1307             else
1308                 form = prefformat->value;
1309             resp->records = pack_records(assoc, req->resultSetName, 1,
1310                 toget, compp, next, presst, form, req->referenceId);
1311             if (!resp->records)
1312                 return 0;
1313             resp->numberOfRecordsReturned = toget;
1314             resp->nextResultSetPosition = next;
1315             resp->searchStatus = sr;
1316             resp->resultSetStatus = 0;
1317             resp->presentStatus = presst;
1318         }
1319         else
1320         {
1321             if (*resp->resultCount)
1322                 *next = 1;
1323             resp->numberOfRecordsReturned = nulint;
1324             resp->nextResultSetPosition = next;
1325             resp->searchStatus = sr;
1326             resp->resultSetStatus = 0;
1327             resp->presentStatus = 0;
1328         }
1329     }
1330     return apdu;
1331 }
1332
1333 /*
1334  * Maybe we got a little over-friendly when we designed bend_fetch to
1335  * get only one record at a time. Some backends can optimise multiple-record
1336  * fetches, and at any rate, there is some overhead involved in
1337  * all that selecting and hopping around. Problem is, of course, that the
1338  * frontend can't know ahead of time how many records it'll need to
1339  * fill the negotiated PDU size. Annoying. Segmentation or not, Z/SR
1340  * is downright lousy as a bulk data transfer protocol.
1341  *
1342  * To start with, we'll do the fetching of records from the backend
1343  * in one operation: To save some trips in and out of the event-handler,
1344  * and to simplify the interface to pack_records. At any rate, asynch
1345  * operation is more fun in operations that have an unpredictable execution
1346  * speed - which is normally more true for search than for present.
1347  */
1348 static Z_APDU *process_presentRequest(association *assoc, request *reqb,
1349     int *fd)
1350 {
1351     Z_PresentRequest *req = reqb->request->u.presentRequest;
1352     oident *prefformat;
1353     oid_value form;
1354     Z_APDU *apdu;
1355     Z_PresentResponse *resp;
1356     int *presst;
1357     int *next;
1358     int *num;
1359
1360     logf(LOG_LOG, "Got PresentRequest.");
1361
1362     if (!(prefformat = oid_getentbyoid(req->preferredRecordSyntax)) ||
1363         prefformat->oclass != CLASS_RECSYN)
1364         form = VAL_NONE;
1365     else
1366         form = prefformat->value;
1367     if (assoc->bend_present)
1368     {
1369         bend_present_rr *bprr = (bend_present_rr *)
1370             nmem_malloc (reqb->request_mem, sizeof(*bprr));
1371         bprr->setname = req->resultSetId;
1372         bprr->start = *req->resultSetStartPoint;
1373         bprr->number = *req->numberOfRecordsRequested;
1374         bprr->format = form;
1375         bprr->comp = req->recordComposition;
1376         bprr->referenceId = req->referenceId;
1377         bprr->stream = assoc->encode;
1378         bprr->request = reqb;
1379         bprr->association = assoc;
1380         bprr->errcode = 0;
1381         bprr->errstring = NULL;
1382         ((int (*)(void *, bend_present_rr *))(*assoc->bend_present))(
1383             assoc->backend, bprr);
1384
1385         if (!bprr->request)
1386             return 0;
1387     }
1388     apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1389     resp = (Z_PresentResponse *)odr_malloc (assoc->encode, sizeof(*resp));
1390     presst = (int *)odr_malloc (assoc->encode, sizeof(*presst));
1391     next = (int *)odr_malloc (assoc->encode, sizeof(*next));
1392     num = (int *)odr_malloc (assoc->encode, sizeof(*num));
1393     *presst = 0;
1394     *next = 0;
1395     *num = *req->numberOfRecordsRequested;
1396
1397     apdu->which = Z_APDU_presentResponse;
1398     apdu->u.presentResponse = resp;
1399     resp->referenceId = req->referenceId;
1400     resp->otherInfo = 0;
1401
1402     resp->records =
1403         pack_records(assoc, req->resultSetId, *req->resultSetStartPoint,
1404                      num, req->recordComposition, next, presst, form,
1405                      req->referenceId);
1406     if (!resp->records)
1407         return 0;
1408     resp->numberOfRecordsReturned = num;
1409     resp->presentStatus = presst;
1410     resp->nextResultSetPosition = next;
1411
1412     return apdu;
1413 }
1414
1415 /*
1416  * Scan was implemented rather in a hurry, and with support for only the basic
1417  * elements of the service in the backend API. Suggestions are welcome.
1418  */
1419 static Z_APDU *process_scanRequest(association *assoc, request *reqb, int *fd)
1420 {
1421     Z_ScanRequest *req = reqb->request->u.scanRequest;
1422     Z_APDU *apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1423     Z_ScanResponse *res = (Z_ScanResponse *)
1424         odr_malloc (assoc->encode, sizeof(*res));
1425     int *scanStatus = (int *)
1426         odr_malloc (assoc->encode, sizeof(*scanStatus));
1427     int *numberOfEntriesReturned = (int *)
1428         odr_malloc (assoc->encode, sizeof(*numberOfEntriesReturned));
1429     Z_ListEntries *ents = (Z_ListEntries *)
1430         odr_malloc (assoc->encode, sizeof(*ents));
1431     Z_DiagRecs *diagrecs_p = NULL;
1432     oident *attent;
1433     bend_scanrequest srq;
1434     bend_scanresult *srs;
1435     oident *attset;
1436
1437     logf(LOG_LOG, "Got ScanRequest");
1438     *scanStatus = Z_Scan_failure;
1439     *numberOfEntriesReturned = 0;
1440
1441     apdu->which = Z_APDU_scanResponse;
1442     apdu->u.scanResponse = res;
1443     res->referenceId = req->referenceId;
1444     res->stepSize = 0;
1445     res->scanStatus = scanStatus;
1446     res->numberOfEntriesReturned = numberOfEntriesReturned;
1447     res->positionOfTerm = 0;
1448     res->entries = ents;
1449     ents->num_entries = 0;
1450     ents->entries = NULL;
1451     ents->num_nonsurrogateDiagnostics = 0;
1452     ents->nonsurrogateDiagnostics = NULL;
1453     res->attributeSet = 0;
1454     res->otherInfo = 0;
1455
1456     if (req->attributeSet && (!(attent = oid_getentbyoid(req->attributeSet)) ||
1457                               attent->oclass != CLASS_ATTSET
1458                               || attent->value != VAL_BIB1))
1459         diagrecs_p = diagrecs(assoc, 121, 0);
1460     else if (req->stepSize && *req->stepSize > 0)
1461         diagrecs_p = diagrecs(assoc, 205, 0);
1462     else
1463     {
1464         if (req->databaseNames)
1465         {
1466             int i;
1467             for (i = 0; i < req->num_databaseNames; i++)
1468                 logf (LOG_LOG, "Database '%s'", req->databaseNames[i]);
1469         }
1470         srq.num_bases = req->num_databaseNames;
1471         srq.basenames = req->databaseNames;
1472         srq.num_entries = *req->numberOfTermsRequested;
1473         srq.term = req->termListAndStartPoint;
1474         srq.referenceId = req->referenceId;
1475         srq.stream = assoc->encode;
1476         if (!(attset = oid_getentbyoid(req->attributeSet)) ||
1477             attset->oclass != CLASS_RECSYN)
1478             srq.attributeset = VAL_NONE;
1479         else
1480             srq.attributeset = attset->value;
1481         log_scan_term (req->termListAndStartPoint, attset->value);
1482         srq.term_position = req->preferredPositionInResponse ?
1483             *req->preferredPositionInResponse : 1;
1484         if (!(srs = bend_scan(assoc->backend, &srq, 0)))
1485             diagrecs_p = diagrecs(assoc, 2, 0);
1486         else if (srs->errcode)
1487             diagrecs_p = diagrecs(assoc, srs->errcode, srs->errstring);
1488         else
1489         {
1490             int i;
1491             Z_Entry **tab = (Z_Entry **)
1492                 odr_malloc (assoc->encode, sizeof(*tab) * srs->num_entries);
1493
1494             if (srs->status == BEND_SCAN_PARTIAL)
1495                 *scanStatus = Z_Scan_partial_5;
1496             else
1497                 *scanStatus = Z_Scan_success;
1498             ents->entries = tab;
1499             ents->num_entries = srs->num_entries;
1500             res->numberOfEntriesReturned = &ents->num_entries;
1501             res->positionOfTerm = &srs->term_position;
1502             for (i = 0; i < srs->num_entries; i++)
1503             {
1504                 Z_Entry *e;
1505                 Z_TermInfo *t;
1506                 Odr_oct *o;
1507
1508                 tab[i] = e = (Z_Entry *)odr_malloc(assoc->encode, sizeof(*e));
1509                 if (srs->entries[i].occurrences >= 0)
1510                 {
1511                     e->which = Z_Entry_termInfo;
1512                     e->u.termInfo = t = (Z_TermInfo *)
1513                         odr_malloc(assoc->encode, sizeof(*t));
1514                     t->suggestedAttributes = 0;
1515                     t->displayTerm = 0;
1516                     t->alternativeTerm = 0;
1517                     t->byAttributes = 0;
1518                     t->otherTermInfo = 0;
1519                     t->globalOccurrences = &srs->entries[i].occurrences;
1520                     t->term = (Z_Term *)
1521                         odr_malloc(assoc->encode, sizeof(*t->term));
1522                     t->term->which = Z_Term_general;
1523                     t->term->u.general = o =
1524                         (Odr_oct *)odr_malloc(assoc->encode, sizeof(Odr_oct));
1525                     o->buf = (unsigned char *)
1526                         odr_malloc(assoc->encode, o->len = o->size =
1527                                    strlen(srs->entries[i].term));
1528                     memcpy(o->buf, srs->entries[i].term, o->len);
1529                     logf(LOG_DEBUG, "  term #%d: '%s' (%d)", i,
1530                          srs->entries[i].term, srs->entries[i].occurrences);
1531                 }
1532                 else
1533                 {
1534                     Z_DiagRecs *drecs = diagrecs (assoc,
1535                                                   srs->entries[i].errcode,
1536                                                   srs->entries[i].errstring);
1537                     assert (drecs->num_diagRecs == 1);
1538                     e->which = Z_Entry_surrogateDiagnostic;
1539                     assert (drecs->diagRecs[0]);
1540                     e->u.surrogateDiagnostic = drecs->diagRecs[0];
1541                 }
1542             }
1543         }
1544     }
1545     if (diagrecs_p)
1546     {
1547         ents->num_nonsurrogateDiagnostics = diagrecs_p->num_diagRecs;
1548         ents->nonsurrogateDiagnostics = diagrecs_p->diagRecs;
1549     }
1550     return apdu;
1551 }
1552
1553 static Z_APDU *process_sortRequest(association *assoc, request *reqb,
1554     int *fd)
1555 {
1556     Z_SortRequest *req = reqb->request->u.sortRequest;
1557     Z_SortResponse *res = (Z_SortResponse *)
1558         odr_malloc (assoc->encode, sizeof(*res));
1559     bend_sort_rr *bsrr = (bend_sort_rr *)
1560         odr_malloc (assoc->encode, sizeof(*bsrr));
1561
1562     Z_APDU *apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1563
1564     logf(LOG_LOG, "Got SortRequest.");
1565
1566 #ifdef ASN_COMPILED
1567     bsrr->num_input_setnames = req->num_inputResultSetNames;
1568     bsrr->input_setnames = req->inputResultSetNames;
1569 #else
1570     bsrr->num_input_setnames = req->inputResultSetNames->num_strings;
1571     bsrr->input_setnames = req->inputResultSetNames->strings;
1572 #endif
1573     bsrr->referenceId = req->referenceId;
1574     bsrr->output_setname = req->sortedResultSetName;
1575     bsrr->sort_sequence = req->sortSequence;
1576     bsrr->stream = assoc->encode;
1577
1578     bsrr->sort_status = Z_SortStatus_failure;
1579     bsrr->errcode = 0;
1580     bsrr->errstring = 0;
1581
1582     ((int (*)(void *, bend_sort_rr *))(*assoc->bend_sort))(assoc->backend,
1583                                                            bsrr);
1584
1585     res->referenceId = bsrr->referenceId;
1586     res->sortStatus = (int *)
1587         odr_malloc (assoc->encode, sizeof(*res->sortStatus));
1588     *res->sortStatus = bsrr->sort_status;
1589     res->resultSetStatus = 0;
1590     if (bsrr->errcode)
1591     {
1592         Z_DiagRecs *dr = diagrecs (assoc, bsrr->errcode, bsrr->errstring);
1593 #ifdef ASN_COMPILED
1594         res->diagnostics = dr->diagRecs;
1595         res->num_diagnostics = dr->num_diagRecs;
1596 #else
1597         res->diagnostics = dr;
1598 #endif
1599     }
1600     else
1601     {
1602 #ifdef ASN_COMPILED
1603         res->num_diagnostics = 0;
1604 #endif
1605         res->diagnostics = 0;
1606     }
1607     res->otherInfo = 0;
1608
1609     apdu->which = Z_APDU_sortResponse;
1610     apdu->u.sortResponse = res;
1611     return apdu;
1612 }
1613
1614 static Z_APDU *process_deleteRequest(association *assoc, request *reqb,
1615     int *fd)
1616 {
1617     Z_DeleteResultSetRequest *req = reqb->request->u.deleteResultSetRequest;
1618     Z_DeleteResultSetResponse *res = (Z_DeleteResultSetResponse *)
1619         odr_malloc (assoc->encode, sizeof(*res));
1620     bend_delete_rr *bdrr = (bend_delete_rr *)
1621         odr_malloc (assoc->encode, sizeof(*bdrr));
1622     Z_APDU *apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1623
1624     logf(LOG_LOG, "Got DeleteRequest.");
1625
1626     bdrr->num_setnames = req->num_resultSetList;
1627     bdrr->setnames = req->resultSetList;
1628     bdrr->stream = assoc->encode;
1629     bdrr->function = *req->deleteFunction;
1630     bdrr->referenceId = req->referenceId;
1631
1632     ((int (*)(void *, bend_delete_rr *))
1633      (*assoc->bend_delete))(assoc->backend, bdrr);
1634
1635     res->referenceId = req->referenceId;
1636
1637     res->deleteOperationStatus = (int *)
1638         odr_malloc (assoc->encode, sizeof(*res->deleteOperationStatus));
1639     *res->deleteOperationStatus = bdrr->delete_status;
1640
1641     res->deleteListStatuses = 0;
1642     res->numberNotDeleted = 0;
1643     res->bulkStatuses = 0;
1644     res->deleteMessage = 0;
1645     res->otherInfo = 0;
1646
1647     apdu->which = Z_APDU_deleteResultSetResponse;
1648     apdu->u.deleteResultSetResponse = res;
1649     return apdu;
1650 }
1651
1652 static void process_close(association *assoc, request *reqb)
1653 {
1654     Z_Close *req = reqb->request->u.close;
1655     static char *reasons[] =
1656     {
1657         "finished",
1658         "shutdown",
1659         "systemProblem",
1660         "costLimit",
1661         "resources",
1662         "securityViolation",
1663         "protocolError",
1664         "lackOfActivity",
1665         "peerAbort",
1666         "unspecified"
1667     };
1668
1669     logf(LOG_LOG, "Got Close, reason %s, message %s",
1670         reasons[*req->closeReason], req->diagnosticInformation ?
1671         req->diagnosticInformation : "NULL");
1672     if (assoc->version < 3) /* to make do_force respond with close */
1673         assoc->version = 3;
1674     do_close_req(assoc, Z_Close_finished,
1675                  "Association terminated by client", reqb);
1676 }
1677
1678 void save_referenceId (request *reqb, Z_ReferenceId *refid)
1679 {
1680     if (refid)
1681     {
1682         reqb->len_refid = refid->len;
1683         reqb->refid = (char *)nmem_malloc (reqb->request_mem, refid->len);
1684         memcpy (reqb->refid, refid->buf, refid->len);
1685     }
1686     else
1687     {
1688         reqb->len_refid = 0;
1689         reqb->refid = NULL;
1690     }
1691 }
1692
1693 void bend_request_send (bend_association a, bend_request req, Z_APDU *res)
1694 {
1695     process_response (a, req, res);
1696 }
1697
1698 bend_request bend_request_mk (bend_association a)
1699 {
1700     request *nreq = request_get (&a->outgoing);
1701     nreq->request_mem = nmem_create ();
1702     return nreq;
1703 }
1704
1705 Z_ReferenceId *bend_request_getid (ODR odr, bend_request req)
1706 {
1707     Z_ReferenceId *id;
1708     if (!req->refid)
1709         return 0;
1710     id = (Odr_oct *)odr_malloc (odr, sizeof(*odr));
1711     id->buf = (unsigned char *)odr_malloc (odr, req->len_refid);
1712     id->len = id->size = req->len_refid;
1713     memcpy (id->buf, req->refid, req->len_refid);
1714     return id;
1715 }
1716
1717 void bend_request_destroy (bend_request *req)
1718 {
1719     nmem_destroy((*req)->request_mem);
1720     request_release(*req);
1721     *req = NULL;
1722 }
1723
1724 int bend_backend_respond (bend_association a, bend_request req)
1725 {
1726     return process_request (a, req);
1727 }
1728
1729 void bend_request_setdata(bend_request r, void *p)
1730 {
1731     r->clientData = p;
1732 }
1733
1734 void *bend_request_getdata(bend_request r)
1735 {
1736     return r->clientData;
1737 }
1738
1739 static Z_APDU *process_ESRequest(association *assoc, request *reqb, int *fd)
1740 {
1741     bend_esrequest_rr esrequest;
1742
1743     Z_ExtendedServicesRequest *req = reqb->request->u.extendedServicesRequest;
1744     Z_APDU *apdu = zget_APDU(assoc->encode, Z_APDU_extendedServicesResponse);
1745
1746     Z_ExtendedServicesResponse *resp = apdu->u.extendedServicesResponse;
1747
1748     logf(LOG_DEBUG,"inside Process esRequest");
1749
1750     esrequest.esr = reqb->request->u.extendedServicesRequest;
1751     esrequest.stream = assoc->encode;
1752     esrequest.errcode = 0;
1753     esrequest.errstring = NULL;
1754     esrequest.request = reqb;
1755     esrequest.association = assoc;
1756     esrequest.referenceId = req->referenceId;
1757
1758     ((int (*)(void *, bend_esrequest_rr *))(*assoc->bend_esrequest))
1759         (assoc->backend, &esrequest);
1760
1761     /* If the response is being delayed, return NULL */
1762     if (esrequest.request == NULL)
1763         return(NULL);
1764
1765     resp->referenceId = req->referenceId;
1766
1767     if (esrequest.errcode == -1)
1768     {
1769         /* Backend service indicates request will be processed */
1770         logf(LOG_DEBUG,"Request could be processed...Accepted !");
1771         *resp->operationStatus = Z_ExtendedServicesResponse_accepted;
1772     }
1773     else if (esrequest.errcode == 0)
1774     {
1775         /* Backend service indicates request will be processed */
1776         logf(LOG_DEBUG,"Request could be processed...Done !");
1777         *resp->operationStatus = Z_ExtendedServicesResponse_done;
1778     }
1779     else
1780     {
1781         Z_DiagRecs *diagRecs = diagrecs (assoc, esrequest.errcode,
1782                                          esrequest.errstring);
1783
1784         /* Backend indicates error, request will not be processed */
1785         logf(LOG_DEBUG,"Request could not be processed...failure !");
1786         *resp->operationStatus = Z_ExtendedServicesResponse_failure;
1787         resp->num_diagnostics = diagRecs->num_diagRecs;
1788         resp->diagnostics = diagRecs->diagRecs;
1789     }
1790     /* Do something with the members of bend_extendedservice */
1791
1792     logf(LOG_DEBUG,"Send the result apdu");
1793     return apdu;
1794 }