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 1.92  1999-06-17 10:54:45  adam
   8  * Added facility to specify implementation version - and name
   9  * for server.
  10  *
  11  * Revision 1.91  1999/06/01 14:29:12  adam
  12  * Work on Extended Services.
  13  *
  14  * Revision 1.90  1999/05/27 13:02:20  adam
  15  * Assigned OID for old DB Update (VAL_DBUPDATE0).
  16  *
  17  * Revision 1.89  1999/05/26 15:24:26  adam
  18  * Fixed minor bugs regarding DB Update (introduced by previous commit).
  19  *
  20  * Revision 1.88  1999/04/20 09:56:48  adam
  21  * Added 'name' paramter to encoder/decoder routines (typedef Odr_fun).
  22  * Modified all encoders/decoders to reflect this change.
  23  *
  24  * Revision 1.87  1999/03/31 11:18:25  adam
  25  * Implemented odr_strdup. Added Reference ID to backend server API.
  26  *
  27  * Revision 1.86  1999/02/02 13:57:38  adam
  28  * Uses preprocessor define WIN32 instead of WINDOWS to build code
  29  * for Microsoft WIN32.
  30  *
  31  * Revision 1.85  1998/11/17 09:52:59  adam
  32  * Fixed minor bug (introduced by previous commit).
  33  *
  34  * Revision 1.84  1998/11/16 16:02:32  adam
  35  * Added loggin utilies, log_rpn_query and log_scan_term. These used
  36  * to be part of Zebra.
  37  *
  38  * Revision 1.83  1998/11/03 10:09:36  adam
  39  * Fixed bug regarding YC.
  40  *
  41  * Revision 1.82  1998/10/20 14:00:30  quinn
  42  * Fixed Scan
  43  *
  44  * Revision 1.81  1998/10/13 16:12:24  adam
  45  * Added support for Surrogate Diagnostics for Scan Term entries.
  46  *
  47  * Revision 1.80  1998/09/02 12:41:53  adam
  48  * Added decode stream in bend search structures.
  49  *
  50  * Revision 1.79  1998/08/19 16:10:08  adam
  51  * Changed som member names of DeleteResultSetRequest/Response.
  52  *
  53  * Revision 1.78  1998/08/03 10:23:55  adam
  54  * Fixed bug regarding Options for Sort.
  55  *
  56  * Revision 1.77  1998/07/20 12:38:42  adam
  57  * Implemented delete result set service to server API.
  58  *
  59  * Revision 1.76  1998/05/27 16:57:07  adam
  60  * Support for surrogate diagnostic records added for bend_fetch.
  61  *
  62  * Revision 1.75  1998/05/18 10:13:07  adam
  63  * Fixed call to es_request handler - extra argument was passed.
  64  *
  65  * Revision 1.74  1998/03/31 15:13:20  adam
  66  * Development towards compiled ASN.1.
  67  *
  68  * Revision 1.73  1998/03/31 11:07:45  adam
  69  * Furhter work on UNIverse resource report.
  70  * Added Extended Services handling in frontend server.
  71  *
  72  * Revision 1.72  1998/02/11 11:53:35  adam
  73  * Changed code so that it compiles as C++.
  74  *
  75  * Revision 1.71  1998/02/10 11:03:57  adam
  76  * Added support for extended handlers in backend server interface.
  77  *
  78  * Revision 1.70  1998/01/29 13:15:35  adam
  79  * Implemented sort for the backend interface.
  80  *
  81  * Revision 1.69  1997/09/30 11:48:12  adam
  82  * Fixed bug introduced by previous commit.
  83  *
  84  * Revision 1.68  1997/09/29 13:18:59  adam
  85  * Added function, oid_ent_to_oid, to replace the function
  86  * oid_getoidbyent, which is not thread safe.
  87  *
  88  * Revision 1.67  1997/09/17 12:10:40  adam
  89  * YAZ version 1.4.
  90  *
  91  * Revision 1.66  1997/09/05 15:26:44  adam
  92  * Added ODR encode in search and scen bend request structures.
  93  * Fixed a few enums that caused trouble with C++.
  94  *
  95  * Revision 1.65  1997/09/01 08:53:01  adam
  96  * New windows NT/95 port using MSV5.0. The test server 'ztest' was
  97  * moved a separate directory. MSV5.0 project server.dsp created.
  98  * As an option, the server can now operate as an NT service.
  99  *
 100  * Revision 1.64  1997/04/30 08:52:11  quinn
 101  * Null
 102  *
 103  * Revision 1.63  1996/10/11  11:57:26  quinn
 104  * Smallish
 105  *
 106  * Revision 1.62  1996/07/06  19:58:35  quinn
 107  * System headerfiles gathered in yconfig
 108  *
 109  * Revision 1.61  1996/06/10  08:56:16  quinn
 110  * Work on Summary.
 111  *
 112  * Revision 1.60  1996/05/30  11:03:10  quinn
 113  * Fixed NextresultSetPosition bug fixed.
 114  *
 115  * Revision 1.59  1996/05/14  09:26:46  quinn
 116  * Added attribute set to scan backend
 117  *
 118  * Revision 1.58  1996/02/20  12:53:04  quinn
 119  * Chanes to SCAN
 120  *
 121  * Revision 1.57  1996/01/02  08:57:47  quinn
 122  * Changed enums in the ASN.1 .h files to #defines. Changed oident.class to oclass
 123  *
 124  * Revision 1.56  1995/12/14  11:09:57  quinn
 125  * Work on Explain
 126  *
 127  * Revision 1.55  1995/11/08  17:41:37  quinn
 128  * Smallish.
 129  *
 130  * Revision 1.54  1995/11/08  15:11:29  quinn
 131  * Log of close transmit.
 132  *
 133  * Revision 1.53  1995/11/01  13:54:58  quinn
 134  * Minor adjustments
 135  *
 136  * Revision 1.52  1995/11/01  12:19:13  quinn
 137  * Second attempt to fix same bug.
 138  *
 139  * Revision 1.50  1995/10/25  16:58:32  quinn
 140  * Simple.
 141  *
 142  * Revision 1.49  1995/10/16  13:51:53  quinn
 143  * Changes to provide Especs to the backend.
 144  *
 145  * Revision 1.48  1995/10/06  08:51:20  quinn
 146  * Added Write-buffer.
 147  *
 148  * Revision 1.47  1995/08/29  14:24:16  quinn
 149  * Added second half of close-handshake
 150  *
 151  * Revision 1.46  1995/08/29  11:17:58  quinn
 152  * Added code to receive close
 153  *
 154  * Revision 1.45  1995/08/21  09:11:00  quinn
 155  * Smallish fixes to suppport new formats.
 156  *
 157  * Revision 1.44  1995/08/17  12:45:25  quinn
 158  * Fixed minor problems with GRS-1. Added support in c&s.
 159  *
 160  * Revision 1.43  1995/08/15  12:00:31  quinn
 161  * Updated External
 162  *
 163  * Revision 1.42  1995/08/15  11:16:50  quinn
 164  *
 165  * Revision 1.41  1995/08/02  10:23:06  quinn
 166  * Smallish
 167  *
 168  * Revision 1.40  1995/07/31  14:34:26  quinn
 169  * Fixed bug in process_searchResponse (numberOfRecordsReturned).
 170  *
 171  * Revision 1.39  1995/06/27  13:21:00  quinn
 172  * SUTRS support
 173  *
 174  * Revision 1.38  1995/06/19  12:39:11  quinn
 175  * Fixed bug in timeout code. Added BER dumper.
 176  *
 177  * Revision 1.37  1995/06/16  13:16:14  quinn
 178  * Fixed Defaultdiagformat.
 179  *
 180  * Revision 1.36  1995/06/16  10:31:36  quinn
 181  * Added session timeout.
 182  *
 183  * Revision 1.35  1995/06/15  07:45:14  quinn
 184  * Moving to v3.
 185  *
 186  * Revision 1.34  1995/06/14  15:26:46  quinn
 187  * *** empty log message ***
 188  *
 189  * Revision 1.33  1995/06/06  14:57:05  quinn
 190  * Better diagnostics.
 191  *
 192  * Revision 1.32  1995/06/06  08:41:44  quinn
 193  * Better diagnostics.
 194  *
 195  * Revision 1.31  1995/06/06  08:15:37  quinn
 196  * Cosmetic.
 197  *
 198  * Revision 1.30  1995/06/05  10:53:32  quinn
 199  * Added a better SCAN.
 200  *
 201  * Revision 1.29  1995/06/01  11:25:03  quinn
 202  * Smallish.
 203  *
 204  * Revision 1.28  1995/06/01  11:21:01  quinn
 205  * Attempting to fix a bug in pack-records. replaced break with continue
 206  * for large records, according to standard.
 207  *
 208  * Revision 1.27  1995/05/29  08:12:06  quinn
 209  * Moved oid to util
 210  *
 211  * Revision 1.26  1995/05/18  13:02:12  quinn
 212  * Smallish.
 213  *
 214  * Revision 1.25  1995/05/17  08:42:26  quinn
 215  * Transfer auth info to backend. Allow backend to reject init gracefully.
 216  *
 217  * Revision 1.24  1995/05/16  08:51:04  quinn
 218  * License, documentation, and memory fixes
 219  *
 220  * Revision 1.23  1995/05/15  13:25:10  quinn
 221  * Fixed memory bug.
 222  *
 223  * Revision 1.22  1995/05/15  11:56:39  quinn
 224  * Asynchronous facilities. Restructuring of seshigh code.
 225  *
 226  * Revision 1.21  1995/05/02  08:53:19  quinn
 227  * Trying in vain to fix comm with ISODE
 228  *
 229  * Revision 1.20  1995/04/20  15:13:00  quinn
 230  * Cosmetic
 231  *
 232  * Revision 1.19  1995/04/18  08:15:34  quinn
 233  * Added dynamic memory allocation on encoding (whew). Code is now somewhat
 234  * neater. We'll make the same change for decoding one day.
 235  *
 236  * Revision 1.18  1995/04/17  11:28:25  quinn
 237  * Smallish
 238  *
 239  * Revision 1.17  1995/04/10  10:23:36  quinn
 240  * Some work to add scan and other things.
 241  *
 242  * Revision 1.16  1995/03/31  09:18:55  quinn
 243  * Added logging.
 244  *
 245  * Revision 1.15  1995/03/30  14:03:23  quinn
 246  * Added RFC1006 as separate library
 247  *
 248  * Revision 1.14  1995/03/30  12:18:17  quinn
 249  * Fixed bug.
 250  *
 251  * Revision 1.13  1995/03/30  09:09:24  quinn
 252  * Added state-handle and some support for asynchronous activities.
 253  *
 254  * Revision 1.12  1995/03/29  15:40:16  quinn
 255  * Ongoing work. Statserv is now dynamic by default
 256  *
 257  * Revision 1.11  1995/03/28  09:16:21  quinn
 258  * Added record packing to the search request
 259  *
 260  * Revision 1.10  1995/03/27  08:34:24  quinn
 261  * Added dynamic server functionality.
 262  * Released bindings to session.c (is now redundant)
 263  *
 264  * Revision 1.9  1995/03/22  15:01:26  quinn
 265  * Adjusting record packing.
 266  *
 267  * Revision 1.8  1995/03/22  10:13:21  quinn
 268  * Working on record packer
 269  *
 270  * Revision 1.7  1995/03/21  15:53:31  quinn
 271  * Little changes.
 272  *
 273  * Revision 1.6  1995/03/21  12:30:09  quinn
 274  * Beginning to add support for record packing.
 275  *
 276  * Revision 1.5  1995/03/17  10:44:13  quinn
 277  * Added catch of null-string in makediagrec
 278  *
 279  * Revision 1.4  1995/03/17  10:18:08  quinn
 280  * Added memory management.
 281  *
 282  * Revision 1.3  1995/03/16  17:42:39  quinn
 283  * Little changes
 284  *
 285  * Revision 1.2  1995/03/16  13:29:01  quinn
 286  * Partitioned server.
 287  *
 288  * Revision 1.1  1995/03/15  16:02:10  quinn
 289  * Modded session.c to seshigh.c
 290  *
 291  */
 292
 293 /*
 294  * Frontend server logic.
 295  *
 296  * This code receives incoming APDUs, and handles client requests by means
 297  * of the backend API.
 298  *
 299  * Some of the code is getting quite involved, compared to simpler servers -
 300  * primarily because it is asynchronous both in the communication with
 301  * the user and the backend. We think the complexity will pay off in
 302  * the form of greater flexibility when more asynchronous facilities
 303  * are implemented.
 304  *
 305  * Memory management has become somewhat involved. In the simple case, where
 306  * only one PDU is pending at a time, it will simply reuse the same memory,
 307  * once it has found its working size. When we enable multiple concurrent
 308  * operations, perhaps even with multiple parallel calls to the backend, it
 309  * will maintain a pool of buffers for encoding and decoding, trying to
 310  * minimize memory allocation/deallocation during normal operation.
 311  *
 312  * TODOs include (and will be done in order of public interest):
 313  *
 314  * Support for EXPLAIN - provide simple meta-database system.
 315  * Support for access control.
 316  * Support for resource control.
 317  * Support for extended services - primarily Item Order.
 318  * Rest of Z39.50-1994
 319  *
 320  */
 321
 322 #include <yconfig.h>
 323 #include <stdlib.h>
 324 #include <stdio.h>
 325 #ifdef WIN32
 326 #include <process.h>
 327 #else
 328 #include <unistd.h>
 329 #endif
 330 #include <assert.h>
 331
 332 #include <xmalloc.h>
 333 #include <comstack.h>
 334 #include "eventl.h"
 335 #include "session.h"
 336 #include <proto.h>
 337 #include <oid.h>
 338 #include <log.h>
 339 #include <logrpn.h>
 340 #include <statserv.h>
 341
 342 #include <backend.h>
 343
 344 static int process_request(association *assoc, request *req);
 345 void backend_response(IOCHAN i, int event);
 346 static int process_response(association *assoc, request *req, Z_APDU *res);
 347 static Z_APDU *process_initRequest(association *assoc, request *reqb);
 348 static Z_APDU *process_searchRequest(association *assoc, request *reqb,
 349     int *fd);
 350 static Z_APDU *response_searchRequest(association *assoc, request *reqb,
 351     bend_search_rr *bsrr, int *fd);
 352 static Z_APDU *process_presentRequest(association *assoc, request *reqb,
 353     int *fd);
 354 static Z_APDU *process_scanRequest(association *assoc, request *reqb, int *fd);
 355 static Z_APDU *process_sortRequest(association *assoc, request *reqb, int *fd);
 356 static void process_close(association *assoc, request *reqb);
 357 void save_referenceId (request *reqb, Z_ReferenceId *refid);
 358 static Z_APDU *process_deleteRequest(association *assoc, request *reqb,
 359     int *fd);
 360
 361 static FILE *apduf = 0; /* for use in static mode */
 362 static statserv_options_block *control_block = 0;
 363
 364 /* Chas: Added in from DALI */
 365 static Z_APDU *process_ESRequest(association *assoc, request *reqb, int *fd);
 366 /* Chas: End of addition from DALI */
 367
 368 /*
 369  * Create and initialize a new association-handle.
 370  *  channel  : iochannel for the current line.
 371  *  link     : communications channel.
 372  * Returns: 0 or a new association handle.
 373  */
 374 association *create_association(IOCHAN channel, COMSTACK link)
 375 {
 376     association *anew;
 377
 378     if (!control_block)
 379         control_block = statserv_getcontrol();
 380     if (!(anew = (association *)xmalloc(sizeof(*anew))))
 381         return 0;
 382     anew->client_chan = channel;
 383     anew->client_link = link;
 384     if (!(anew->decode = odr_createmem(ODR_DECODE)) ||
 385         !(anew->encode = odr_createmem(ODR_ENCODE)))
 386         return 0;
 387     if (*control_block->apdufile)
 388     {
 389         char filename[256];
 390         FILE *f;
 391
 392         strcpy(filename, control_block->apdufile);
 393         if (!(anew->print = odr_createmem(ODR_PRINT)))
 394             return 0;
 395         if (*control_block->apdufile != '-')
 396         {
 397             strcpy(filename, control_block->apdufile);
 398             if (!control_block->dynamic)
 399             {
 400                 if (!apduf)
 401                 {
 402                     if (!(apduf = fopen(filename, "w")))
 403                     {
 404                         logf(LOG_WARN|LOG_ERRNO, "%s", filename);
 405                         return 0;
 406                     }
 407                     setvbuf(apduf, 0, _IONBF, 0);
 408                 }
 409                 f = apduf;
 410             }
 411             else
 412             {
 413                 sprintf(filename + strlen(filename), ".%d", getpid());
 414                 if (!(f = fopen(filename, "w")))
 415                 {
 416                     logf(LOG_WARN|LOG_ERRNO, "%s", filename);
 417                     return 0;
 418                 }
 419                 setvbuf(f, 0, _IONBF, 0);
 420             }
 421             odr_setprint(anew->print, f);
 422         }
 423     }
 424     else
 425         anew->print = 0;
 426     anew->input_buffer = 0;
 427     anew->input_buffer_len = 0;
 428     anew->backend = 0;
 429     anew->state = ASSOC_NEW;
 430     request_initq(&anew->incoming);
 431     request_initq(&anew->outgoing);
 432     anew->proto = cs_getproto(link);
 433     return anew;
 434 }
 435
 436 /*
 437  * Free association and release resources.
 438  */
 439 void destroy_association(association *h)
 440 {
 441     odr_destroy(h->decode);
 442     odr_destroy(h->encode);
 443     if (h->print)
 444         odr_destroy(h->print);
 445     if (h->input_buffer)
 446     xfree(h->input_buffer);
 447     if (h->backend)
 448         bend_close(h->backend);
 449     while (request_deq(&h->incoming));
 450     while (request_deq(&h->outgoing));
 451     request_delq(&h->incoming);
 452     request_delq(&h->outgoing);
 453     xfree(h);
 454 }
 455
 456 static void do_close_req(association *a, int reason, char *message,
 457                          request *req)
 458 {
 459     Z_APDU apdu;
 460     Z_Close *cls = zget_Close(a->encode);
 461
 462     /* Purge request queue */
 463     while (request_deq(&a->incoming));
 464     while (request_deq(&a->outgoing));
 465     if (a->version >= 3)
 466     {
 467         logf(LOG_LOG, "Sending Close PDU, reason=%d, message=%s",
 468             reason, message ? message : "none");
 469         apdu.which = Z_APDU_close;
 470         apdu.u.close = cls;
 471         *cls->closeReason = reason;
 472         cls->diagnosticInformation = message;
 473         process_response(a, req, &apdu);
 474         iochan_settimeout(a->client_chan, 60);
 475     }
 476     else
 477     {
 478         logf(LOG_DEBUG, "v2 client. No Close PDU");
 479         iochan_setevent(a->client_chan, EVENT_TIMEOUT); /* force imm close */
 480     }
 481     a->state = ASSOC_DEAD;
 482 }
 483
 484 static void do_close(association *a, int reason, char *message)
 485 {
 486     do_close_req (a, reason, message, request_get(&a->outgoing));
 487 }
 488
 489 /*
 490  * This is where PDUs from the client are read and the further
 491  * processing is initiated. Flow of control moves down through the
 492  * various process_* functions below, until the encoded result comes back up
 493  * to the output handler in here.
 494  *
 495  *  h     : the I/O channel that has an outstanding event.
 496  *  event : the current outstanding event.
 497  */
 498 void ir_session(IOCHAN h, int event)
 499 {
 500     int res;
 501     association *assoc = (association *)iochan_getdata(h);
 502     COMSTACK conn = assoc->client_link;
 503     request *req;
 504
 505     assert(h && conn && assoc);
 506     if (event == EVENT_TIMEOUT)
 507     {
 508         if (assoc->state != ASSOC_UP)
 509         {
 510             logf(LOG_LOG, "Final timeout - closing connection.");
 511             cs_close(conn);
 512             destroy_association(assoc);
 513             iochan_destroy(h);
 514         }
 515         else
 516         {
 517             logf(LOG_LOG, "Session idle too long. Sending close.");
 518             do_close(assoc, Z_Close_lackOfActivity, 0);
 519         }
 520         return;
 521     }
 522     if (event & EVENT_INPUT || event & EVENT_WORK) /* input */
 523     {
 524         if (event & EVENT_INPUT)
 525         {
 526             logf(LOG_DEBUG, "ir_session (input)");
 527             assert(assoc && conn);
 528             /* We aren't speaking to this fellow */
 529             if (assoc->state == ASSOC_DEAD)
 530             {
 531                 logf(LOG_LOG, "Closed connection after reject");
 532                 cs_close(conn);
 533                 destroy_association(assoc);
 534                 iochan_destroy(h);
 535                 return;
 536             }
 537             if ((res = cs_get(conn, &assoc->input_buffer,
 538                 &assoc->input_buffer_len)) <= 0)
 539             {
 540                 logf(LOG_LOG, "Connection closed by client");
 541                 cs_close(conn);
 542                 destroy_association(assoc);
 543                 iochan_destroy(h);
 544                 return;
 545             }
 546             else if (res == 1) /* incomplete read - wait for more  */
 547                 return;
 548             if (cs_more(conn)) /* more stuff - call us again later, please */
 549                 iochan_setevent(h, EVENT_INPUT);
 550
 551             /* we got a complete PDU. Let's decode it */
 552             logf(LOG_DEBUG, "Got PDU, %d bytes", res);
 553             req = request_get(&assoc->incoming); /* get a new request structure */
 554             odr_reset(assoc->decode);
 555             odr_setbuf(assoc->decode, assoc->input_buffer, res, 0);
 556             if (!z_APDU(assoc->decode, &req->request, 0, 0))
 557             {
 558                 logf(LOG_LOG, "ODR error on incoming PDU: %s [near byte %d] ",
 559                     odr_errmsg(odr_geterror(assoc->decode)),
 560                     odr_offset(assoc->decode));
 561                 logf(LOG_LOG, "PDU dump:");
 562                 odr_dumpBER(log_file(), assoc->input_buffer, res);
 563                 do_close(assoc, Z_Close_protocolError, "Malformed package");
 564                 return;
 565             }
 566             req->request_mem = odr_extract_mem(assoc->decode);
 567             if (assoc->print && !z_APDU(assoc->print, &req->request, 0, 0))
 568             {
 569                 logf(LOG_WARN, "ODR print error: %s",
 570                     odr_errmsg(odr_geterror(assoc->print)));
 571                 odr_reset(assoc->print);
 572             }
 573             request_enq(&assoc->incoming, req);
 574         }
 575
 576         /* can we do something yet? */
 577         req = request_head(&assoc->incoming);
 578         if (req->state == REQUEST_IDLE)
 579         {
 580             request_deq(&assoc->incoming);
 581             if (process_request(assoc, req) < 0)
 582                 do_close_req(assoc, Z_Close_systemProblem, "Unknown error",
 583                              req);
 584         }
 585     }
 586     if (event & EVENT_OUTPUT)
 587     {
 588         request *req = request_head(&assoc->outgoing);
 589
 590         logf(LOG_DEBUG, "ir_session (output)");
 591         req->state = REQUEST_PENDING;
 592         switch (res = cs_put(conn, req->response, req->len_response))
 593         {
 594             case -1:
 595                 logf(LOG_LOG, "Connection closed by client");
 596                 cs_close(conn);
 597                 destroy_association(assoc);
 598                 iochan_destroy(h);
 599                 break;
 600             case 0: /* all sent - release the request structure */
 601                 logf(LOG_DEBUG, "Wrote PDU, %d bytes", req->len_response);
 602                 nmem_destroy(req->request_mem);
 603                 request_deq(&assoc->outgoing);
 604                 request_release(req);
 605                 if (!request_head(&assoc->outgoing))
 606                     iochan_clearflag(h, EVENT_OUTPUT);
 607                 break;
 608             /* value of 1 -- partial send -- is simply ignored */
 609         }
 610     }
 611     if (event & EVENT_EXCEPT)
 612     {
 613         logf(LOG_DEBUG, "ir_session (exception)");
 614         cs_close(conn);
 615         destroy_association(assoc);
 616         iochan_destroy(h);
 617     }
 618 }
 619
 620 /*
 621  * Initiate request processing.
 622  */
 623 static int process_request(association *assoc, request *req)
 624 {
 625     int fd = -1;
 626     Z_APDU *res;
 627     int retval;
 628
 629     assert(req && req->state == REQUEST_IDLE);
 630     switch (req->request->which)
 631     {
 632         case Z_APDU_initRequest:
 633             res = process_initRequest(assoc, req); break;
 634         case Z_APDU_searchRequest:
 635             res = process_searchRequest(assoc, req, &fd); break;
 636         case Z_APDU_presentRequest:
 637             res = process_presentRequest(assoc, req, &fd); break;
 638         case Z_APDU_scanRequest:
 639             res = process_scanRequest(assoc, req, &fd); break;
 640         case Z_APDU_extendedServicesRequest:
 641             if (assoc->bend_esrequest)
 642                 res = process_ESRequest(assoc, req, &fd);
 643             else
 644             {
 645                 logf(LOG_WARN, "Cannot handle EXTENDED SERVICES APDU");
 646                 return -1;
 647             }
 648             break;
 649         case Z_APDU_sortRequest:
 650             if (assoc->bend_sort)
 651                 res = process_sortRequest(assoc, req, &fd);
 652             else
 653             {
 654                 logf(LOG_WARN, "Cannot handle SORT APDU");
 655                 return -1;
 656             }
 657             break;
 658         case Z_APDU_close:
 659             process_close(assoc, req); return 0;
 660         case Z_APDU_deleteResultSetRequest:
 661             if (assoc->bend_delete)
 662                 res = process_deleteRequest(assoc, req, &fd);
 663             else
 664             {
 665                 logf (LOG_WARN, "Cannot handle Delete APDU");
 666                 return -1;
 667             }
 668             break;
 669         default:
 670             logf(LOG_WARN, "Bad APDU received");
 671             return -1;
 672     }
 673     if (res)
 674     {
 675         logf(LOG_DEBUG, "  result immediately available");
 676         retval = process_response(assoc, req, res);
 677     }
 678     else if (fd < 0)
 679     {
 680         logf(LOG_DEBUG, "  result unavailble");
 681         retval = 0;
 682     }
 683     else /* no result yet - one will be provided later */
 684     {
 685         IOCHAN chan;
 686
 687         /* Set up an I/O handler for the fd supplied by the backend */
 688
 689         logf(LOG_DEBUG, "   establishing handler for result");
 690         req->state = REQUEST_PENDING;
 691         if (!(chan = iochan_create(fd, backend_response, EVENT_INPUT)))
 692             abort();
 693         iochan_setdata(chan, assoc);
 694         retval = 0;
 695     }
 696     return retval;
 697 }
 698
 699 /*
 700  * Handle message from the backend.
 701  */
 702 void backend_response(IOCHAN i, int event)
 703 {
 704     association *assoc = (association *)iochan_getdata(i);
 705     request *req = request_head(&assoc->incoming);
 706     Z_APDU *res;
 707     int fd;
 708
 709     logf(LOG_DEBUG, "backend_response");
 710     assert(assoc && req && req->state != REQUEST_IDLE);
 711     /* determine what it is we're waiting for */
 712     switch (req->request->which)
 713     {
 714         case Z_APDU_searchRequest:
 715             res = response_searchRequest(assoc, req, 0, &fd); break;
 716 #if 0
 717         case Z_APDU_presentRequest:
 718             res = response_presentRequest(assoc, req, 0, &fd); break;
 719         case Z_APDU_scanRequest:
 720             res = response_scanRequest(assoc, req, 0, &fd); break;
 721 #endif
 722         default:
 723             logf(LOG_WARN, "Serious programmer's lapse or bug");
 724             abort();
 725     }
 726     if ((res && process_response(assoc, req, res) < 0) || fd < 0)
 727     {
 728         logf(LOG_LOG, "Fatal error when talking to backend");
 729         do_close(assoc, Z_Close_systemProblem, 0);
 730         iochan_destroy(i);
 731         return;
 732     }
 733     else if (!res) /* no result yet - try again later */
 734     {
 735         logf(LOG_DEBUG, "   no result yet");
 736         iochan_setfd(i, fd); /* in case fd has changed */
 737     }
 738 }
 739
 740 /*
 741  * Encode response, and transfer the request structure to the outgoing queue.
 742  */
 743 static int process_response(association *assoc, request *req, Z_APDU *res)
 744 {
 745     odr_setbuf(assoc->encode, req->response, req->size_response, 1);
 746     if (!z_APDU(assoc->encode, &res, 0, 0))
 747     {
 748         logf(LOG_WARN, "ODR error when encoding response: %s",
 749             odr_errmsg(odr_geterror(assoc->decode)));
 750         odr_reset(assoc->encode);
 751         return -1;
 752     }
 753     req->response = odr_getbuf(assoc->encode, &req->len_response,
 754         &req->size_response);
 755     odr_setbuf(assoc->encode, 0, 0, 0); /* don'txfree if we abort later */
 756     if (assoc->print && !z_APDU(assoc->print, &res, 0, 0))
 757     {
 758         logf(LOG_WARN, "ODR print error: %s",
 759             odr_errmsg(odr_geterror(assoc->print)));
 760         odr_reset(assoc->print);
 761     }
 762     odr_reset(assoc->encode);
 763     req->state = REQUEST_IDLE;
 764     request_enq(&assoc->outgoing, req);
 765     /* turn the work over to the ir_session handler */
 766     iochan_setflag(assoc->client_chan, EVENT_OUTPUT);
 767     /* Is there more work to be done? give that to the input handler too */
 768 #if 1
 769     if (request_head(&assoc->incoming))
 770     {
 771         logf (LOG_DEBUG, "more work to be done");
 772         iochan_setevent(assoc->client_chan, EVENT_WORK);
 773     }
 774 #endif
 775     return 0;
 776 }
 777
 778 /*
 779  * Handle init request.
 780  * At the moment, we don't check the options
 781  * anywhere else in the code - we just try not to do anything that would
 782  * break a naive client. We'll toss 'em into the association block when
 783  * we need them there.
 784  */
 785 static Z_APDU *process_initRequest(association *assoc, request *reqb)
 786 {
 787     Z_InitRequest *req = reqb->request->u.initRequest;
 788     Z_APDU *apdu = zget_APDU(assoc->encode, Z_APDU_initResponse);
 789     Z_InitResponse *resp = apdu->u.initResponse;
 790     bend_initrequest binitreq;
 791     bend_initresult *binitres;
 792     char options[100];
 793
 794     logf(LOG_LOG, "Got initRequest");
 795     if (req->implementationId)
 796         logf(LOG_LOG, "Id:        %s", req->implementationId);
 797     if (req->implementationName)
 798         logf(LOG_LOG, "Name:      %s", req->implementationName);
 799     if (req->implementationVersion)
 800         logf(LOG_LOG, "Version:   %s", req->implementationVersion);
 801
 802     binitreq.stream = assoc->encode;
 803     binitreq.configname = "default-config";
 804     binitreq.auth = req->idAuthentication;
 805     binitreq.referenceId = req->referenceId;
 806     binitreq.implementation_version = 0;
 807     binitreq.implementation_name = 0;
 808     binitreq.bend_sort = NULL;
 809     binitreq.bend_search = NULL;
 810     binitreq.bend_present = NULL;
 811     binitreq.bend_esrequest = NULL;
 812     binitreq.bend_delete = NULL;
 813     if (!(binitres = bend_init(&binitreq)))
 814     {
 815         logf(LOG_WARN, "Bad response from backend.");
 816         return 0;
 817     }
 818
 819     assoc->backend = binitres->handle;
 820     if ((assoc->bend_sort = (int (*)())binitreq.bend_sort))
 821         logf (LOG_DEBUG, "Sort handler installed");
 822     if ((assoc->bend_search = (int (*)())binitreq.bend_search))
 823         logf (LOG_DEBUG, "Search handler installed");
 824     if ((assoc->bend_present = (int (*)())binitreq.bend_present))
 825         logf (LOG_DEBUG, "Present handler installed");
 826     if ((assoc->bend_esrequest = (int (*)())binitreq.bend_esrequest))
 827         logf (LOG_DEBUG, "ESRequest handler installed");
 828     if ((assoc->bend_delete = (int (*)())binitreq.bend_delete))
 829         logf (LOG_DEBUG, "Delete handler installed");
 830
 831     resp->referenceId = req->referenceId;
 832     *options = '\0';
 833     /* let's tell the client what we can do */
 834     if (ODR_MASK_GET(req->options, Z_Options_search))
 835     {
 836         ODR_MASK_SET(resp->options, Z_Options_search);
 837         strcat(options, "srch");
 838     }
 839     if (ODR_MASK_GET(req->options, Z_Options_present))
 840     {
 841         ODR_MASK_SET(resp->options, Z_Options_present);
 842         strcat(options, " prst");
 843     }
 844     if (ODR_MASK_GET(req->options, Z_Options_delSet) && binitreq.bend_delete)
 845     {
 846         ODR_MASK_SET(resp->options, Z_Options_delSet);
 847         strcat(options, " del");
 848     }
 849     if (ODR_MASK_GET(req->options, Z_Options_extendedServices) &&
 850         binitreq.bend_esrequest)
 851     {
 852         ODR_MASK_SET(resp->options, Z_Options_extendedServices);
 853         strcat (options, " extendedServices");
 854     }
 855     if (ODR_MASK_GET(req->options, Z_Options_namedResultSets))
 856     {
 857         ODR_MASK_SET(resp->options, Z_Options_namedResultSets);
 858         strcat(options, " namedresults");
 859     }
 860     if (ODR_MASK_GET(req->options, Z_Options_scan))
 861     {
 862         ODR_MASK_SET(resp->options, Z_Options_scan);
 863         strcat(options, " scan");
 864     }
 865     if (ODR_MASK_GET(req->options, Z_Options_concurrentOperations))
 866     {
 867         ODR_MASK_SET(resp->options, Z_Options_concurrentOperations);
 868         strcat(options, " concurop");
 869     }
 870     if (ODR_MASK_GET(req->options, Z_Options_sort) && binitreq.bend_sort)
 871     {
 872         ODR_MASK_SET(resp->options, Z_Options_sort);
 873         strcat(options, " sort");
 874     }
 875     if (ODR_MASK_GET(req->protocolVersion, Z_ProtocolVersion_1))
 876     {
 877         ODR_MASK_SET(resp->protocolVersion, Z_ProtocolVersion_1);
 878         assoc->version = 2; /* 1 & 2 are equivalent */
 879     }
 880     if (ODR_MASK_GET(req->protocolVersion, Z_ProtocolVersion_2))
 881     {
 882         ODR_MASK_SET(resp->protocolVersion, Z_ProtocolVersion_2);
 883         assoc->version = 2;
 884     }
 885     if (ODR_MASK_GET(req->protocolVersion, Z_ProtocolVersion_3))
 886     {
 887         ODR_MASK_SET(resp->protocolVersion, Z_ProtocolVersion_3);
 888         assoc->version = 3;
 889     }
 890     logf(LOG_LOG, "Negotiated to v%d: %s", assoc->version, options);
 891     assoc->maximumRecordSize = *req->maximumRecordSize;
 892     if (assoc->maximumRecordSize > control_block->maxrecordsize)
 893         assoc->maximumRecordSize = control_block->maxrecordsize;
 894     assoc->preferredMessageSize = *req->preferredMessageSize;
 895     if (assoc->preferredMessageSize > assoc->maximumRecordSize)
 896         assoc->preferredMessageSize = assoc->maximumRecordSize;
 897     resp->preferredMessageSize = &assoc->preferredMessageSize;
 898     resp->maximumRecordSize = &assoc->maximumRecordSize;
 899
 900     resp->implementationName = "Index Data/YAZ Generic Frontend Server";
 901
 902     if (binitreq.implementation_name)
 903     {
 904         char *nv = (char *)
 905             odr_malloc (assoc->encode,
 906                         strlen(binitreq.implementation_name) + 3 +
 907                                strlen(resp->implementationName));
 908         sprintf (nv, "%s %s",
 909                  resp->implementationName, binitreq.implementation_name);
 910         resp->implementationName = nv;
 911     }
 912     if (binitreq.implementation_version)
 913     {
 914         char *nv = (char *)
 915             odr_malloc (assoc->encode,
 916                         strlen(binitreq.implementation_version) + 3 +
 917                                strlen(resp->implementationVersion));
 918         sprintf (nv, "%s %s",
 919                  resp->implementationVersion, binitreq.implementation_version);
 920         resp->implementationVersion = nv;
 921     }
 922
 923     if (binitres->errcode)
 924     {
 925         logf(LOG_LOG, "Connection rejected by backend.");
 926         *resp->result = 0;
 927         assoc->state = ASSOC_DEAD;
 928     }
 929     else
 930         assoc->state = ASSOC_UP;
 931     return apdu;
 932 }
 933
 934 /*
 935  * These functions should be merged.
 936  */
 937
 938 static void set_addinfo (Z_DefaultDiagFormat *dr, char *addinfo)
 939 {
 940 #if ASN_COMPILED
 941     dr->which = Z_DefaultDiagFormat_v2Addinfo;
 942     dr->u.v2Addinfo = addinfo ? addinfo : "";
 943 #else
 944     dr->which = Z_DiagForm_v2AddInfo;
 945     dr->addinfo = addinfo ? addinfo : "";
 946 #endif
 947 }
 948
 949 /*
 950  * nonsurrogate diagnostic record.
 951  */
 952 static Z_Records *diagrec(association *assoc, int error, char *addinfo)
 953 {
 954     int oid[OID_SIZE];
 955     Z_Records *rec = (Z_Records *)
 956         odr_malloc (assoc->encode, sizeof(*rec));
 957     oident bib1;
 958     int *err = (int *)
 959         odr_malloc (assoc->encode, sizeof(*err));
 960     Z_DiagRec *drec = (Z_DiagRec *)
 961         odr_malloc (assoc->encode, sizeof(*drec));
 962     Z_DefaultDiagFormat *dr = (Z_DefaultDiagFormat *)
 963         odr_malloc (assoc->encode, sizeof(*dr));
 964
 965     bib1.proto = assoc->proto;
 966     bib1.oclass = CLASS_DIAGSET;
 967     bib1.value = VAL_BIB1;
 968
 969     logf(LOG_DEBUG, "Diagnostic: %d -- %s", error, addinfo ? addinfo :
 970         "NULL");
 971     *err = error;
 972     rec->which = Z_Records_NSD;
 973 #if ASN_COMPILED
 974     rec->u.nonSurrogateDiagnostic = dr;
 975 #else
 976     rec->u.nonSurrogateDiagnostic = drec;
 977     drec->which = Z_DiagRec_defaultFormat;
 978     drec->u.defaultFormat = dr;
 979 #endif
 980     dr->diagnosticSetId =
 981         odr_oiddup (assoc->encode, oid_ent_to_oid(&bib1, oid));
 982     dr->condition = err;
 983     set_addinfo (dr, addinfo);
 984     return rec;
 985 }
 986
 987 /*
 988  * surrogate diagnostic.
 989  */
 990 static Z_NamePlusRecord *surrogatediagrec(association *assoc, char *dbname,
 991                                           int error, char *addinfo)
 992 {
 993     int oid[OID_SIZE];
 994     Z_NamePlusRecord *rec = (Z_NamePlusRecord *)
 995         odr_malloc (assoc->encode, sizeof(*rec));
 996     int *err = (int *)odr_malloc (assoc->encode, sizeof(*err));
 997     oident bib1;
 998     Z_DiagRec *drec = (Z_DiagRec *)odr_malloc (assoc->encode, sizeof(*drec));
 999     Z_DefaultDiagFormat *dr = (Z_DefaultDiagFormat *)
1000         odr_malloc (assoc->encode, sizeof(*dr));
1001
1002     bib1.proto = assoc->proto;
1003     bib1.oclass = CLASS_DIAGSET;
1004     bib1.value = VAL_BIB1;
1005
1006     logf(LOG_DEBUG, "SurrogateDiagnotic: %d -- %s", error, addinfo);
1007     *err = error;
1008     rec->databaseName = dbname;
1009     rec->which = Z_NamePlusRecord_surrogateDiagnostic;
1010     rec->u.surrogateDiagnostic = drec;
1011     drec->which = Z_DiagRec_defaultFormat;
1012     drec->u.defaultFormat = dr;
1013     dr->diagnosticSetId = odr_oiddup (assoc->encode,
1014                                       oid_ent_to_oid(&bib1, oid));
1015     dr->condition = err;
1016     set_addinfo (dr, addinfo);
1017
1018     return rec;
1019 }
1020
1021 /*
1022  * multiple nonsurrogate diagnostics.
1023  */
1024 static Z_DiagRecs *diagrecs(association *assoc, int error, char *addinfo)
1025 {
1026     int oid[OID_SIZE];
1027     Z_DiagRecs *recs = (Z_DiagRecs *)odr_malloc (assoc->encode, sizeof(*recs));
1028     int *err = (int *)odr_malloc (assoc->encode, sizeof(*err));
1029     oident bib1;
1030     Z_DiagRec **recp = (Z_DiagRec **)odr_malloc (assoc->encode, sizeof(*recp));
1031     Z_DiagRec *drec = (Z_DiagRec *)odr_malloc (assoc->encode, sizeof(*drec));
1032     Z_DefaultDiagFormat *rec = (Z_DefaultDiagFormat *)odr_malloc (assoc->encode, sizeof(*rec));
1033
1034     logf(LOG_DEBUG, "DiagRecs: %d -- %s", error, addinfo ? addinfo : "");
1035     bib1.proto = assoc->proto;
1036     bib1.oclass = CLASS_DIAGSET;
1037     bib1.value = VAL_BIB1;
1038
1039     *err = error;
1040     recs->num_diagRecs = 1;
1041     recs->diagRecs = recp;
1042     recp[0] = drec;
1043     drec->which = Z_DiagRec_defaultFormat;
1044     drec->u.defaultFormat = rec;
1045
1046     rec->diagnosticSetId = odr_oiddup (assoc->encode,
1047                                       oid_ent_to_oid(&bib1, oid));
1048     rec->condition = err;
1049
1050 #ifdef ASN_COMPILED
1051     rec->which = Z_DefaultDiagFormat_v2Addinfo;
1052     rec->u.v2Addinfo = addinfo ? addinfo : "";
1053 #else
1054     rec->which = Z_DiagForm_v2AddInfo;
1055     rec->addinfo = addinfo ? addinfo : "";
1056 #endif
1057     return recs;
1058 }
1059
1060 static Z_Records *pack_records(association *a, char *setname, int start,
1061                                 int *num, Z_RecordComposition *comp,
1062                                 int *next, int *pres, oid_value format,
1063                                 Z_ReferenceId *referenceId)
1064 {
1065     int recno, total_length = 0, toget = *num, dumped_records = 0;
1066     Z_Records *records =
1067         (Z_Records *) odr_malloc (a->encode, sizeof(*records));
1068     Z_NamePlusRecordList *reclist =
1069         (Z_NamePlusRecordList *) odr_malloc (a->encode, sizeof(*reclist));
1070     Z_NamePlusRecord **list =
1071         (Z_NamePlusRecord **) odr_malloc (a->encode, sizeof(*list) * toget);
1072
1073     records->which = Z_Records_DBOSD;
1074     records->u.databaseOrSurDiagnostics = reclist;
1075     reclist->num_records = 0;
1076     reclist->records = list;
1077     *pres = Z_PRES_SUCCESS;
1078     *num = 0;
1079     *next = 0;
1080
1081     logf(LOG_LOG, "Request to pack %d+%d", start, toget);
1082     logf(LOG_DEBUG, "pms=%d, mrs=%d", a->preferredMessageSize,
1083         a->maximumRecordSize);
1084     for (recno = start; reclist->num_records < toget; recno++)
1085     {
1086         bend_fetchrequest freq;
1087         bend_fetchresult *fres;
1088         Z_NamePlusRecord *thisrec;
1089         int this_length = 0;
1090         /*
1091          * we get the number of bytes allocated on the stream before any
1092          * allocation done by the backend - this should give us a reasonable
1093          * idea of the total size of the data so far.
1094          */
1095         total_length = odr_total(a->encode) - dumped_records;
1096         freq.setname = setname;
1097         freq.number = recno;
1098         freq.comp = comp;
1099         freq.format = format;
1100         freq.stream = a->encode;
1101         freq.surrogate_flag = 0;
1102         freq.referenceId = referenceId;
1103         if (!(fres = bend_fetch(a->backend, &freq, 0)))
1104         {
1105             *pres = Z_PRES_FAILURE;
1106             return diagrec(a, 2, "Backend interface problem");
1107         }
1108         /* backend should be able to signal whether error is system-wide
1109            or only pertaining to current record */
1110         if (fres->errcode)
1111         {
1112             if (!freq.surrogate_flag)
1113             {
1114                 *pres = Z_PRES_FAILURE;
1115                 return diagrec(a, fres->errcode, fres->errstring);
1116             }
1117             reclist->records[reclist->num_records] =
1118                 surrogatediagrec(a, fres->basename, fres->errcode,
1119                                  fres->errstring);
1120             reclist->num_records++;
1121             *next = fres->last_in_set ? 0 : recno + 1;
1122             continue;
1123         }
1124         if (fres->len >= 0)
1125             this_length = fres->len;
1126         else
1127             this_length = odr_total(a->encode) - total_length;
1128         logf(LOG_DEBUG, "  fetched record, len=%d, total=%d",
1129             this_length, total_length);
1130         if (this_length + total_length > a->preferredMessageSize)
1131         {
1132             /* record is small enough, really */
1133             if (this_length <= a->preferredMessageSize)
1134             {
1135                 logf(LOG_DEBUG, "  Dropped last normal-sized record");
1136                 *pres = Z_PRES_PARTIAL_2;
1137                 break;
1138             }
1139             /* record can only be fetched by itself */
1140             if (this_length < a->maximumRecordSize)
1141             {
1142                 logf(LOG_DEBUG, "  Record > prefmsgsz");
1143                 if (toget > 1)
1144                 {
1145                     logf(LOG_DEBUG, "  Dropped it");
1146                     reclist->records[reclist->num_records] =
1147                          surrogatediagrec(a, fres->basename, 16, 0);
1148                     reclist->num_records++;
1149                     *next = fres->last_in_set ? 0 : recno + 1;
1150                     dumped_records += this_length;
1151                     continue;
1152                 }
1153             }
1154             else /* too big entirely */
1155             {
1156                 logf(LOG_DEBUG, "Record > maxrcdsz");
1157                 reclist->records[reclist->num_records] =
1158                     surrogatediagrec(a, fres->basename, 17, 0);
1159                 reclist->num_records++;
1160                 *next = fres->last_in_set ? 0 : recno + 1;
1161                 dumped_records += this_length;
1162                 continue;
1163             }
1164         }
1165
1166         if (!(thisrec = (Z_NamePlusRecord *)
1167               odr_malloc(a->encode, sizeof(*thisrec))))
1168             return 0;
1169         if (!(thisrec->databaseName = (char *)odr_malloc(a->encode,
1170             strlen(fres->basename) + 1)))
1171             return 0;
1172         strcpy(thisrec->databaseName, fres->basename);
1173         thisrec->which = Z_NamePlusRecord_databaseRecord;
1174         thisrec->u.databaseRecord = z_ext_record(a->encode, fres->format,
1175                                                  fres->record, fres->len);
1176         if (!thisrec->u.databaseRecord)
1177             return 0;
1178         reclist->records[reclist->num_records] = thisrec;
1179         reclist->num_records++;
1180         *next = fres->last_in_set ? 0 : recno + 1;
1181     }
1182     *num = reclist->num_records;
1183     return records;
1184 }
1185
1186 static Z_APDU *process_searchRequest(association *assoc, request *reqb,
1187     int *fd)
1188 {
1189     Z_SearchRequest *req = reqb->request->u.searchRequest;
1190     bend_search_rr *bsrr =
1191         (bend_search_rr *)nmem_malloc (reqb->request_mem, sizeof(*bsrr));
1192
1193     logf(LOG_LOG, "Got SearchRequest.");
1194     bsrr->fd = fd;
1195     bsrr->request = reqb;
1196     bsrr->association = assoc;
1197     bsrr->referenceId = req->referenceId;
1198     save_referenceId (reqb, bsrr->referenceId);
1199
1200     logf (LOG_LOG, "ResultSet '%s'", req->resultSetName);
1201     if (req->databaseNames)
1202     {
1203         int i;
1204         for (i = 0; i < req->num_databaseNames; i++)
1205             logf (LOG_LOG, "Database '%s'", req->databaseNames[i]);
1206     }
1207     switch (req->query->which)
1208     {
1209     case Z_Query_type_1: case Z_Query_type_101:
1210         log_rpn_query (req->query->u.type_1);
1211     }
1212     if (assoc->bend_search)
1213     {
1214         bsrr->setname = req->resultSetName;
1215         bsrr->replace_set = *req->replaceIndicator;
1216         bsrr->num_bases = req->num_databaseNames;
1217         bsrr->basenames = req->databaseNames;
1218         bsrr->query = req->query;
1219         bsrr->stream = assoc->encode;
1220         bsrr->decode = assoc->decode;
1221         bsrr->errcode = 0;
1222         bsrr->hits = 0;
1223         bsrr->errstring = NULL;
1224         ((int (*)(void *, bend_search_rr *))(assoc->bend_search))
1225             (assoc->backend, bsrr);
1226         if (!bsrr->request)
1227             return 0;
1228     }
1229     else
1230     {
1231         bend_searchrequest bsrq;
1232         bend_searchresult *bsrt;
1233
1234         bsrq.setname = req->resultSetName;
1235         bsrq.replace_set = *req->replaceIndicator;
1236         bsrq.num_bases = req->num_databaseNames;
1237         bsrq.basenames = req->databaseNames;
1238         bsrq.query = req->query;
1239         bsrq.referenceId = req->referenceId;
1240         bsrq.stream = assoc->encode;
1241         bsrq.decode = assoc->decode;
1242         if (!(bsrt = bend_search (assoc->backend, &bsrq, fd)))
1243             return 0;
1244         bsrr->hits = bsrt->hits;
1245         bsrr->errcode = bsrt->errcode;
1246         bsrr->errstring = bsrt->errstring;
1247     }
1248     return response_searchRequest(assoc, reqb, bsrr, fd);
1249 }
1250
1251 int bend_searchresponse(void *handle, bend_search_rr *bsrr) {return 0;}
1252
1253 /*
1254  * Prepare a searchresponse based on the backend results. We probably want
1255  * to look at making the fetching of records nonblocking as well, but
1256  * so far, we'll keep things simple.
1257  * If bsrt is null, that means we're called in response to a communications
1258  * event, and we'll have to get the response for ourselves.
1259  */
1260 static Z_APDU *response_searchRequest(association *assoc, request *reqb,
1261     bend_search_rr *bsrt, int *fd)
1262 {
1263     Z_SearchRequest *req = reqb->request->u.searchRequest;
1264     Z_APDU *apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1265     Z_SearchResponse *resp = (Z_SearchResponse *)
1266         odr_malloc (assoc->encode, sizeof(*resp));
1267     int *nulint = (int *)odr_malloc (assoc->encode, sizeof(*nulint));
1268     bool_t *sr = (bool_t *)odr_malloc (assoc->encode, sizeof(*sr));
1269     int *next = (int *)odr_malloc (assoc->encode, sizeof(*next));
1270     int *none = (int *)odr_malloc (assoc->encode, sizeof(*none));
1271
1272     *nulint = 0;
1273     *sr = 1;
1274     *next = 0;
1275     *none = Z_RES_NONE;
1276
1277     apdu->which = Z_APDU_searchResponse;
1278     apdu->u.searchResponse = resp;
1279     resp->referenceId = req->referenceId;
1280     resp->additionalSearchInfo = 0;
1281     resp->otherInfo = 0;
1282     *fd = -1;
1283     if (!bsrt && !bend_searchresponse(assoc->backend, bsrt))
1284     {
1285         logf(LOG_FATAL, "Bad result from backend");
1286         return 0;
1287     }
1288     else if (bsrt->errcode)
1289     {
1290         resp->records = diagrec(assoc, bsrt->errcode, bsrt->errstring);
1291         resp->resultCount = nulint;
1292         resp->numberOfRecordsReturned = nulint;
1293         resp->nextResultSetPosition = nulint;
1294         resp->searchStatus = nulint;
1295         resp->resultSetStatus = none;
1296         resp->presentStatus = 0;
1297     }
1298     else
1299     {
1300         int *toget = (int *)odr_malloc (assoc->encode, sizeof(*toget));
1301         int *presst = (int *)odr_malloc (assoc->encode, sizeof(*presst));
1302         Z_RecordComposition comp, *compp = 0;
1303
1304         *toget = 0;
1305         *presst = 0;
1306         resp->records = 0;
1307         resp->resultCount = &bsrt->hits;
1308
1309         comp.which = Z_RecordComp_simple;
1310         /* how many records does the user agent want, then? */
1311         if (bsrt->hits <= *req->smallSetUpperBound)
1312         {
1313             *toget = bsrt->hits;
1314             if ((comp.u.simple = req->smallSetElementSetNames))
1315                 compp = &comp;
1316         }
1317         else if (bsrt->hits < *req->largeSetLowerBound)
1318         {
1319             *toget = *req->mediumSetPresentNumber;
1320             if (*toget > bsrt->hits)
1321                 *toget = bsrt->hits;
1322             if ((comp.u.simple = req->mediumSetElementSetNames))
1323                 compp = &comp;
1324         }
1325         else
1326             *toget = 0;
1327
1328         if (*toget && !resp->records)
1329         {
1330             oident *prefformat;
1331             oid_value form;
1332
1333             if (!(prefformat = oid_getentbyoid(req->preferredRecordSyntax)) ||
1334                 prefformat->oclass != CLASS_RECSYN)
1335                 form = VAL_NONE;
1336             else
1337                 form = prefformat->value;
1338             resp->records = pack_records(assoc, req->resultSetName, 1,
1339                 toget, compp, next, presst, form, req->referenceId);
1340             if (!resp->records)
1341                 return 0;
1342             resp->numberOfRecordsReturned = toget;
1343             resp->nextResultSetPosition = next;
1344             resp->searchStatus = sr;
1345             resp->resultSetStatus = 0;
1346             resp->presentStatus = presst;
1347         }
1348         else
1349         {
1350             if (*resp->resultCount)
1351                 *next = 1;
1352             resp->numberOfRecordsReturned = nulint;
1353             resp->nextResultSetPosition = next;
1354             resp->searchStatus = sr;
1355             resp->resultSetStatus = 0;
1356             resp->presentStatus = 0;
1357         }
1358     }
1359     return apdu;
1360 }
1361
1362 /*
1363  * Maybe we got a little over-friendly when we designed bend_fetch to
1364  * get only one record at a time. Some backends can optimise multiple-record
1365  * fetches, and at any rate, there is some overhead involved in
1366  * all that selecting and hopping around. Problem is, of course, that the
1367  * frontend can't know ahead of time how many records it'll need to
1368  * fill the negotiated PDU size. Annoying. Segmentation or not, Z/SR
1369  * is downright lousy as a bulk data transfer protocol.
1370  *
1371  * To start with, we'll do the fetching of records from the backend
1372  * in one operation: To save some trips in and out of the event-handler,
1373  * and to simplify the interface to pack_records. At any rate, asynch
1374  * operation is more fun in operations that have an unpredictable execution
1375  * speed - which is normally more true for search than for present.
1376  */
1377 static Z_APDU *process_presentRequest(association *assoc, request *reqb,
1378     int *fd)
1379 {
1380     Z_PresentRequest *req = reqb->request->u.presentRequest;
1381     oident *prefformat;
1382     oid_value form;
1383     Z_APDU *apdu;
1384     Z_PresentResponse *resp;
1385     int *presst;
1386     int *next;
1387     int *num;
1388
1389     logf(LOG_LOG, "Got PresentRequest.");
1390
1391     if (!(prefformat = oid_getentbyoid(req->preferredRecordSyntax)) ||
1392         prefformat->oclass != CLASS_RECSYN)
1393         form = VAL_NONE;
1394     else
1395         form = prefformat->value;
1396     if (assoc->bend_present)
1397     {
1398         bend_present_rr *bprr = (bend_present_rr *)
1399             nmem_malloc (reqb->request_mem, sizeof(*bprr));
1400         bprr->setname = req->resultSetId;
1401         bprr->start = *req->resultSetStartPoint;
1402         bprr->number = *req->numberOfRecordsRequested;
1403         bprr->format = form;
1404         bprr->comp = req->recordComposition;
1405         bprr->referenceId = req->referenceId;
1406         bprr->stream = assoc->encode;
1407         bprr->request = reqb;
1408         bprr->association = assoc;
1409         bprr->errcode = 0;
1410         bprr->errstring = NULL;
1411         ((int (*)(void *, bend_present_rr *))(*assoc->bend_present))(
1412             assoc->backend, bprr);
1413
1414         if (!bprr->request)
1415             return 0;
1416     }
1417     apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1418     resp = (Z_PresentResponse *)odr_malloc (assoc->encode, sizeof(*resp));
1419     presst = (int *)odr_malloc (assoc->encode, sizeof(*presst));
1420     next = (int *)odr_malloc (assoc->encode, sizeof(*next));
1421     num = (int *)odr_malloc (assoc->encode, sizeof(*num));
1422     *presst = 0;
1423     *next = 0;
1424     *num = *req->numberOfRecordsRequested;
1425
1426     apdu->which = Z_APDU_presentResponse;
1427     apdu->u.presentResponse = resp;
1428     resp->referenceId = req->referenceId;
1429     resp->otherInfo = 0;
1430
1431     resp->records =
1432         pack_records(assoc, req->resultSetId, *req->resultSetStartPoint,
1433                      num, req->recordComposition, next, presst, form,
1434                      req->referenceId);
1435     if (!resp->records)
1436         return 0;
1437     resp->numberOfRecordsReturned = num;
1438     resp->presentStatus = presst;
1439     resp->nextResultSetPosition = next;
1440
1441     return apdu;
1442 }
1443
1444 /*
1445  * Scan was implemented rather in a hurry, and with support for only the basic
1446  * elements of the service in the backend API. Suggestions are welcome.
1447  */
1448 static Z_APDU *process_scanRequest(association *assoc, request *reqb, int *fd)
1449 {
1450     Z_ScanRequest *req = reqb->request->u.scanRequest;
1451     Z_APDU *apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1452     Z_ScanResponse *res = (Z_ScanResponse *)
1453         odr_malloc (assoc->encode, sizeof(*res));
1454     int *scanStatus = (int *)
1455         odr_malloc (assoc->encode, sizeof(*scanStatus));
1456     int *numberOfEntriesReturned = (int *)
1457         odr_malloc (assoc->encode, sizeof(*numberOfEntriesReturned));
1458     Z_ListEntries *ents = (Z_ListEntries *)
1459         odr_malloc (assoc->encode, sizeof(*ents));
1460     Z_DiagRecs *diagrecs_p = NULL;
1461     oident *attent;
1462     bend_scanrequest srq;
1463     bend_scanresult *srs;
1464     oident *attset;
1465
1466     logf(LOG_LOG, "Got ScanRequest");
1467     *scanStatus = Z_Scan_failure;
1468     *numberOfEntriesReturned = 0;
1469
1470     apdu->which = Z_APDU_scanResponse;
1471     apdu->u.scanResponse = res;
1472     res->referenceId = req->referenceId;
1473     res->stepSize = 0;
1474     res->scanStatus = scanStatus;
1475     res->numberOfEntriesReturned = numberOfEntriesReturned;
1476     res->positionOfTerm = 0;
1477     res->entries = ents;
1478     ents->num_entries = 0;
1479     ents->entries = NULL;
1480     ents->num_nonsurrogateDiagnostics = 0;
1481     ents->nonsurrogateDiagnostics = NULL;
1482     res->attributeSet = 0;
1483     res->otherInfo = 0;
1484
1485     if (req->attributeSet && (!(attent = oid_getentbyoid(req->attributeSet)) ||
1486                               attent->oclass != CLASS_ATTSET
1487                               || attent->value != VAL_BIB1))
1488         diagrecs_p = diagrecs(assoc, 121, 0);
1489     else if (req->stepSize && *req->stepSize > 0)
1490         diagrecs_p = diagrecs(assoc, 205, 0);
1491     else
1492     {
1493         if (req->databaseNames)
1494         {
1495             int i;
1496             for (i = 0; i < req->num_databaseNames; i++)
1497                 logf (LOG_LOG, "Database '%s'", req->databaseNames[i]);
1498         }
1499         srq.num_bases = req->num_databaseNames;
1500         srq.basenames = req->databaseNames;
1501         srq.num_entries = *req->numberOfTermsRequested;
1502         srq.term = req->termListAndStartPoint;
1503         srq.referenceId = req->referenceId;
1504         srq.stream = assoc->encode;
1505         if (!(attset = oid_getentbyoid(req->attributeSet)) ||
1506             attset->oclass != CLASS_RECSYN)
1507             srq.attributeset = VAL_NONE;
1508         else
1509             srq.attributeset = attset->value;
1510         log_scan_term (req->termListAndStartPoint, attset->value);
1511         srq.term_position = req->preferredPositionInResponse ?
1512             *req->preferredPositionInResponse : 1;
1513         if (!(srs = bend_scan(assoc->backend, &srq, 0)))
1514             diagrecs_p = diagrecs(assoc, 2, 0);
1515         else if (srs->errcode)
1516             diagrecs_p = diagrecs(assoc, srs->errcode, srs->errstring);
1517         else
1518         {
1519             int i;
1520             Z_Entry **tab = (Z_Entry **)
1521                 odr_malloc (assoc->encode, sizeof(*tab) * srs->num_entries);
1522
1523             if (srs->status == BEND_SCAN_PARTIAL)
1524                 *scanStatus = Z_Scan_partial_5;
1525             else
1526                 *scanStatus = Z_Scan_success;
1527             ents->entries = tab;
1528             ents->num_entries = srs->num_entries;
1529             res->numberOfEntriesReturned = &ents->num_entries;
1530             res->positionOfTerm = &srs->term_position;
1531             for (i = 0; i < srs->num_entries; i++)
1532             {
1533                 Z_Entry *e;
1534                 Z_TermInfo *t;
1535                 Odr_oct *o;
1536
1537                 tab[i] = e = (Z_Entry *)odr_malloc(assoc->encode, sizeof(*e));
1538                 if (srs->entries[i].occurrences >= 0)
1539                 {
1540                     e->which = Z_Entry_termInfo;
1541                     e->u.termInfo = t = (Z_TermInfo *)
1542                         odr_malloc(assoc->encode, sizeof(*t));
1543                     t->suggestedAttributes = 0;
1544                     t->displayTerm = 0;
1545                     t->alternativeTerm = 0;
1546                     t->byAttributes = 0;
1547                     t->otherTermInfo = 0;
1548                     t->globalOccurrences = &srs->entries[i].occurrences;
1549                     t->term = (Z_Term *)
1550                         odr_malloc(assoc->encode, sizeof(*t->term));
1551                     t->term->which = Z_Term_general;
1552                     t->term->u.general = o =
1553                         (Odr_oct *)odr_malloc(assoc->encode, sizeof(Odr_oct));
1554                     o->buf = (unsigned char *)
1555                         odr_malloc(assoc->encode, o->len = o->size =
1556                                    strlen(srs->entries[i].term));
1557                     memcpy(o->buf, srs->entries[i].term, o->len);
1558                     logf(LOG_DEBUG, "  term #%d: '%s' (%d)", i,
1559                          srs->entries[i].term, srs->entries[i].occurrences);
1560                 }
1561                 else
1562                 {
1563                     Z_DiagRecs *drecs = diagrecs (assoc,
1564                                                   srs->entries[i].errcode,
1565                                                   srs->entries[i].errstring);
1566                     assert (drecs->num_diagRecs == 1);
1567                     e->which = Z_Entry_surrogateDiagnostic;
1568                     assert (drecs->diagRecs[0]);
1569                     e->u.surrogateDiagnostic = drecs->diagRecs[0];
1570                 }
1571             }
1572         }
1573     }
1574     if (diagrecs_p)
1575     {
1576         ents->num_nonsurrogateDiagnostics = diagrecs_p->num_diagRecs;
1577         ents->nonsurrogateDiagnostics = diagrecs_p->diagRecs;
1578     }
1579     return apdu;
1580 }
1581
1582 static Z_APDU *process_sortRequest(association *assoc, request *reqb,
1583     int *fd)
1584 {
1585     Z_SortRequest *req = reqb->request->u.sortRequest;
1586     Z_SortResponse *res = (Z_SortResponse *)
1587         odr_malloc (assoc->encode, sizeof(*res));
1588     bend_sort_rr *bsrr = (bend_sort_rr *)
1589         odr_malloc (assoc->encode, sizeof(*bsrr));
1590
1591     Z_APDU *apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1592
1593     logf(LOG_LOG, "Got SortRequest.");
1594
1595 #ifdef ASN_COMPILED
1596     bsrr->num_input_setnames = req->num_inputResultSetNames;
1597     bsrr->input_setnames = req->inputResultSetNames;
1598 #else
1599     bsrr->num_input_setnames = req->inputResultSetNames->num_strings;
1600     bsrr->input_setnames = req->inputResultSetNames->strings;
1601 #endif
1602     bsrr->referenceId = req->referenceId;
1603     bsrr->output_setname = req->sortedResultSetName;
1604     bsrr->sort_sequence = req->sortSequence;
1605     bsrr->stream = assoc->encode;
1606
1607     bsrr->sort_status = Z_SortStatus_failure;
1608     bsrr->errcode = 0;
1609     bsrr->errstring = 0;
1610
1611     ((int (*)(void *, bend_sort_rr *))(*assoc->bend_sort))(assoc->backend,
1612                                                            bsrr);
1613
1614     res->referenceId = bsrr->referenceId;
1615     res->sortStatus = (int *)
1616         odr_malloc (assoc->encode, sizeof(*res->sortStatus));
1617     *res->sortStatus = bsrr->sort_status;
1618     res->resultSetStatus = 0;
1619     if (bsrr->errcode)
1620     {
1621         Z_DiagRecs *dr = diagrecs (assoc, bsrr->errcode, bsrr->errstring);
1622 #ifdef ASN_COMPILED
1623         res->diagnostics = dr->diagRecs;
1624         res->num_diagnostics = dr->num_diagRecs;
1625 #else
1626         res->diagnostics = dr;
1627 #endif
1628     }
1629     else
1630     {
1631 #ifdef ASN_COMPILED
1632         res->num_diagnostics = 0;
1633 #endif
1634         res->diagnostics = 0;
1635     }
1636     res->otherInfo = 0;
1637
1638     apdu->which = Z_APDU_sortResponse;
1639     apdu->u.sortResponse = res;
1640     return apdu;
1641 }
1642
1643 static Z_APDU *process_deleteRequest(association *assoc, request *reqb,
1644     int *fd)
1645 {
1646     Z_DeleteResultSetRequest *req = reqb->request->u.deleteResultSetRequest;
1647     Z_DeleteResultSetResponse *res = (Z_DeleteResultSetResponse *)
1648         odr_malloc (assoc->encode, sizeof(*res));
1649     bend_delete_rr *bdrr = (bend_delete_rr *)
1650         odr_malloc (assoc->encode, sizeof(*bdrr));
1651     Z_APDU *apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1652
1653     logf(LOG_LOG, "Got DeleteRequest.");
1654
1655     bdrr->num_setnames = req->num_resultSetList;
1656     bdrr->setnames = req->resultSetList;
1657     bdrr->stream = assoc->encode;
1658     bdrr->function = *req->deleteFunction;
1659     bdrr->referenceId = req->referenceId;
1660
1661     ((int (*)(void *, bend_delete_rr *))
1662      (*assoc->bend_delete))(assoc->backend, bdrr);
1663
1664     res->referenceId = req->referenceId;
1665
1666     res->deleteOperationStatus = (int *)
1667         odr_malloc (assoc->encode, sizeof(*res->deleteOperationStatus));
1668     *res->deleteOperationStatus = bdrr->delete_status;
1669
1670     res->deleteListStatuses = 0;
1671     res->numberNotDeleted = 0;
1672     res->bulkStatuses = 0;
1673     res->deleteMessage = 0;
1674     res->otherInfo = 0;
1675
1676     apdu->which = Z_APDU_deleteResultSetResponse;
1677     apdu->u.deleteResultSetResponse = res;
1678     return apdu;
1679 }
1680
1681 static void process_close(association *assoc, request *reqb)
1682 {
1683     Z_Close *req = reqb->request->u.close;
1684     static char *reasons[] =
1685     {
1686         "finished",
1687         "shutdown",
1688         "systemProblem",
1689         "costLimit",
1690         "resources",
1691         "securityViolation",
1692         "protocolError",
1693         "lackOfActivity",
1694         "peerAbort",
1695         "unspecified"
1696     };
1697
1698     logf(LOG_LOG, "Got Close, reason %s, message %s",
1699         reasons[*req->closeReason], req->diagnosticInformation ?
1700         req->diagnosticInformation : "NULL");
1701     if (assoc->version < 3) /* to make do_force respond with close */
1702         assoc->version = 3;
1703     do_close_req(assoc, Z_Close_finished,
1704                  "Association terminated by client", reqb);
1705 }
1706
1707 void save_referenceId (request *reqb, Z_ReferenceId *refid)
1708 {
1709     if (refid)
1710     {
1711         reqb->len_refid = refid->len;
1712         reqb->refid = (char *)nmem_malloc (reqb->request_mem, refid->len);
1713         memcpy (reqb->refid, refid->buf, refid->len);
1714     }
1715     else
1716     {
1717         reqb->len_refid = 0;
1718         reqb->refid = NULL;
1719     }
1720 }
1721
1722 void bend_request_send (bend_association a, bend_request req, Z_APDU *res)
1723 {
1724     process_response (a, req, res);
1725 }
1726
1727 bend_request bend_request_mk (bend_association a)
1728 {
1729     request *nreq = request_get (&a->outgoing);
1730     nreq->request_mem = nmem_create ();
1731     return nreq;
1732 }
1733
1734 Z_ReferenceId *bend_request_getid (ODR odr, bend_request req)
1735 {
1736     Z_ReferenceId *id;
1737     if (!req->refid)
1738         return 0;
1739     id = (Odr_oct *)odr_malloc (odr, sizeof(*odr));
1740     id->buf = (unsigned char *)odr_malloc (odr, req->len_refid);
1741     id->len = id->size = req->len_refid;
1742     memcpy (id->buf, req->refid, req->len_refid);
1743     return id;
1744 }
1745
1746 void bend_request_destroy (bend_request *req)
1747 {
1748     nmem_destroy((*req)->request_mem);
1749     request_release(*req);
1750     *req = NULL;
1751 }
1752
1753 int bend_backend_respond (bend_association a, bend_request req)
1754 {
1755     return process_request (a, req);
1756 }
1757
1758 void bend_request_setdata(bend_request r, void *p)
1759 {
1760     r->clientData = p;
1761 }
1762
1763 void *bend_request_getdata(bend_request r)
1764 {
1765     return r->clientData;
1766 }
1767
1768 static Z_APDU *process_ESRequest(association *assoc, request *reqb, int *fd)
1769 {
1770     bend_esrequest_rr esrequest;
1771
1772     Z_ExtendedServicesRequest *req = reqb->request->u.extendedServicesRequest;
1773     Z_APDU *apdu = zget_APDU(assoc->encode, Z_APDU_extendedServicesResponse);
1774
1775     Z_ExtendedServicesResponse *resp = apdu->u.extendedServicesResponse;
1776
1777     logf(LOG_DEBUG,"inside Process esRequest");
1778
1779     esrequest.esr = reqb->request->u.extendedServicesRequest;
1780     esrequest.stream = assoc->encode;
1781     esrequest.errcode = 0;
1782     esrequest.errstring = NULL;
1783     esrequest.request = reqb;
1784     esrequest.association = assoc;
1785     esrequest.referenceId = req->referenceId;
1786
1787     ((int (*)(void *, bend_esrequest_rr *))(*assoc->bend_esrequest))
1788         (assoc->backend, &esrequest);
1789
1790     /* If the response is being delayed, return NULL */
1791     if (esrequest.request == NULL)
1792         return(NULL);
1793
1794     resp->referenceId = req->referenceId;
1795
1796     if (esrequest.errcode == -1)
1797     {
1798         /* Backend service indicates request will be processed */
1799         logf(LOG_DEBUG,"Request could be processed...Accepted !");
1800         *resp->operationStatus = Z_ExtendedServicesResponse_accepted;
1801     }
1802     else if (esrequest.errcode == 0)
1803     {
1804         /* Backend service indicates request will be processed */
1805         logf(LOG_DEBUG,"Request could be processed...Done !");
1806         *resp->operationStatus = Z_ExtendedServicesResponse_done;
1807     }
1808     else
1809     {
1810         Z_DiagRecs *diagRecs = diagrecs (assoc, esrequest.errcode,
1811                                          esrequest.errstring);
1812
1813         /* Backend indicates error, request will not be processed */
1814         logf(LOG_DEBUG,"Request could not be processed...failure !");
1815         *resp->operationStatus = Z_ExtendedServicesResponse_failure;
1816         resp->num_diagnostics = diagRecs->num_diagRecs;
1817         resp->diagnostics = diagRecs->diagRecs;
1818     }
1819     /* Do something with the members of bend_extendedservice */
1820
1821     logf(LOG_DEBUG,"Send the result apdu");
1822     return apdu;
1823 }