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