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