server/seshigh.c

   1 /*
   2  * Copyright (c) 1995-1998, Index Data
   3  * See the file LICENSE for details.
   4  * Sebastian Hammer, Adam Dickmeiss
   5  *
   6  * $Log: seshigh.c,v $
   7  * Revision 1.72  1998-02-11 11:53:35  adam
   8  * Changed code so that it compiles as C++.
   9  *
  10  * Revision 1.71  1998/02/10 11:03:57  adam
  11  * Added support for extended handlers in backend server interface.
  12  *
  13  * Revision 1.70  1998/01/29 13:15:35  adam
  14  * Implemented sort for the backend interface.
  15  *
  16  * Revision 1.69  1997/09/30 11:48:12  adam
  17  * Fixed bug introduced by previous commit.
  18  *
  19  * Revision 1.68  1997/09/29 13:18:59  adam
  20  * Added function, oid_ent_to_oid, to replace the function
  21  * oid_getoidbyent, which is not thread safe.
  22  *
  23  * Revision 1.67  1997/09/17 12:10:40  adam
  24  * YAZ version 1.4.
  25  *
  26  * Revision 1.66  1997/09/05 15:26:44  adam
  27  * Added ODR encode in search and scen bend request structures.
  28  * Fixed a few enums that caused trouble with C++.
  29  *
  30  * Revision 1.65  1997/09/01 08:53:01  adam
  31  * New windows NT/95 port using MSV5.0. The test server 'ztest' was
  32  * moved a separate directory. MSV5.0 project server.dsp created.
  33  * As an option, the server can now operate as an NT service.
  34  *
  35  * Revision 1.64  1997/04/30 08:52:11  quinn
  36  * Null
  37  *
  38  * Revision 1.63  1996/10/11  11:57:26  quinn
  39  * Smallish
  40  *
  41  * Revision 1.62  1996/07/06  19:58:35  quinn
  42  * System headerfiles gathered in yconfig
  43  *
  44  * Revision 1.61  1996/06/10  08:56:16  quinn
  45  * Work on Summary.
  46  *
  47  * Revision 1.60  1996/05/30  11:03:10  quinn
  48  * Fixed NextresultSetPosition bug fixed.
  49  *
  50  * Revision 1.59  1996/05/14  09:26:46  quinn
  51  * Added attribute set to scan backend
  52  *
  53  * Revision 1.58  1996/02/20  12:53:04  quinn
  54  * Chanes to SCAN
  55  *
  56  * Revision 1.57  1996/01/02  08:57:47  quinn
  57  * Changed enums in the ASN.1 .h files to #defines. Changed oident.class to oclass
  58  *
  59  * Revision 1.56  1995/12/14  11:09:57  quinn
  60  * Work on Explain
  61  *
  62  * Revision 1.55  1995/11/08  17:41:37  quinn
  63  * Smallish.
  64  *
  65  * Revision 1.54  1995/11/08  15:11:29  quinn
  66  * Log of close transmit.
  67  *
  68  * Revision 1.53  1995/11/01  13:54:58  quinn
  69  * Minor adjustments
  70  *
  71  * Revision 1.52  1995/11/01  12:19:13  quinn
  72  * Second attempt to fix same bug.
  73  *
  74  * Revision 1.50  1995/10/25  16:58:32  quinn
  75  * Simple.
  76  *
  77  * Revision 1.49  1995/10/16  13:51:53  quinn
  78  * Changes to provide Especs to the backend.
  79  *
  80  * Revision 1.48  1995/10/06  08:51:20  quinn
  81  * Added Write-buffer.
  82  *
  83  * Revision 1.47  1995/08/29  14:24:16  quinn
  84  * Added second half of close-handshake
  85  *
  86  * Revision 1.46  1995/08/29  11:17:58  quinn
  87  * Added code to receive close
  88  *
  89  * Revision 1.45  1995/08/21  09:11:00  quinn
  90  * Smallish fixes to suppport new formats.
  91  *
  92  * Revision 1.44  1995/08/17  12:45:25  quinn
  93  * Fixed minor problems with GRS-1. Added support in c&s.
  94  *
  95  * Revision 1.43  1995/08/15  12:00:31  quinn
  96  * Updated External
  97  *
  98  * Revision 1.42  1995/08/15  11:16:50  quinn
  99  *
 100  * Revision 1.41  1995/08/02  10:23:06  quinn
 101  * Smallish
 102  *
 103  * Revision 1.40  1995/07/31  14:34:26  quinn
 104  * Fixed bug in process_searchResponse (numberOfRecordsReturned).
 105  *
 106  * Revision 1.39  1995/06/27  13:21:00  quinn
 107  * SUTRS support
 108  *
 109  * Revision 1.38  1995/06/19  12:39:11  quinn
 110  * Fixed bug in timeout code. Added BER dumper.
 111  *
 112  * Revision 1.37  1995/06/16  13:16:14  quinn
 113  * Fixed Defaultdiagformat.
 114  *
 115  * Revision 1.36  1995/06/16  10:31:36  quinn
 116  * Added session timeout.
 117  *
 118  * Revision 1.35  1995/06/15  07:45:14  quinn
 119  * Moving to v3.
 120  *
 121  * Revision 1.34  1995/06/14  15:26:46  quinn
 122  * *** empty log message ***
 123  *
 124  * Revision 1.33  1995/06/06  14:57:05  quinn
 125  * Better diagnostics.
 126  *
 127  * Revision 1.32  1995/06/06  08:41:44  quinn
 128  * Better diagnostics.
 129  *
 130  * Revision 1.31  1995/06/06  08:15:37  quinn
 131  * Cosmetic.
 132  *
 133  * Revision 1.30  1995/06/05  10:53:32  quinn
 134  * Added a better SCAN.
 135  *
 136  * Revision 1.29  1995/06/01  11:25:03  quinn
 137  * Smallish.
 138  *
 139  * Revision 1.28  1995/06/01  11:21:01  quinn
 140  * Attempting to fix a bug in pack-records. replaced break with continue
 141  * for large records, according to standard.
 142  *
 143  * Revision 1.27  1995/05/29  08:12:06  quinn
 144  * Moved oid to util
 145  *
 146  * Revision 1.26  1995/05/18  13:02:12  quinn
 147  * Smallish.
 148  *
 149  * Revision 1.25  1995/05/17  08:42:26  quinn
 150  * Transfer auth info to backend. Allow backend to reject init gracefully.
 151  *
 152  * Revision 1.24  1995/05/16  08:51:04  quinn
 153  * License, documentation, and memory fixes
 154  *
 155  * Revision 1.23  1995/05/15  13:25:10  quinn
 156  * Fixed memory bug.
 157  *
 158  * Revision 1.22  1995/05/15  11:56:39  quinn
 159  * Asynchronous facilities. Restructuring of seshigh code.
 160  *
 161  * Revision 1.21  1995/05/02  08:53:19  quinn
 162  * Trying in vain to fix comm with ISODE
 163  *
 164  * Revision 1.20  1995/04/20  15:13:00  quinn
 165  * Cosmetic
 166  *
 167  * Revision 1.19  1995/04/18  08:15:34  quinn
 168  * Added dynamic memory allocation on encoding (whew). Code is now somewhat
 169  * neater. We'll make the same change for decoding one day.
 170  *
 171  * Revision 1.18  1995/04/17  11:28:25  quinn
 172  * Smallish
 173  *
 174  * Revision 1.17  1995/04/10  10:23:36  quinn
 175  * Some work to add scan and other things.
 176  *
 177  * Revision 1.16  1995/03/31  09:18:55  quinn
 178  * Added logging.
 179  *
 180  * Revision 1.15  1995/03/30  14:03:23  quinn
 181  * Added RFC1006 as separate library
 182  *
 183  * Revision 1.14  1995/03/30  12:18:17  quinn
 184  * Fixed bug.
 185  *
 186  * Revision 1.13  1995/03/30  09:09:24  quinn
 187  * Added state-handle and some support for asynchronous activities.
 188  *
 189  * Revision 1.12  1995/03/29  15:40:16  quinn
 190  * Ongoing work. Statserv is now dynamic by default
 191  *
 192  * Revision 1.11  1995/03/28  09:16:21  quinn
 193  * Added record packing to the search request
 194  *
 195  * Revision 1.10  1995/03/27  08:34:24  quinn
 196  * Added dynamic server functionality.
 197  * Released bindings to session.c (is now redundant)
 198  *
 199  * Revision 1.9  1995/03/22  15:01:26  quinn
 200  * Adjusting record packing.
 201  *
 202  * Revision 1.8  1995/03/22  10:13:21  quinn
 203  * Working on record packer
 204  *
 205  * Revision 1.7  1995/03/21  15:53:31  quinn
 206  * Little changes.
 207  *
 208  * Revision 1.6  1995/03/21  12:30:09  quinn
 209  * Beginning to add support for record packing.
 210  *
 211  * Revision 1.5  1995/03/17  10:44:13  quinn
 212  * Added catch of null-string in makediagrec
 213  *
 214  * Revision 1.4  1995/03/17  10:18:08  quinn
 215  * Added memory management.
 216  *
 217  * Revision 1.3  1995/03/16  17:42:39  quinn
 218  * Little changes
 219  *
 220  * Revision 1.2  1995/03/16  13:29:01  quinn
 221  * Partitioned server.
 222  *
 223  * Revision 1.1  1995/03/15  16:02:10  quinn
 224  * Modded session.c to seshigh.c
 225  *
 226  */
 227
 228 /*
 229  * Frontend server logic.
 230  *
 231  * This code receives incoming APDUs, and handles client requests by means
 232  * of the backend API.
 233  *
 234  * Some of the code is getting quite involved, compared to simpler servers -
 235  * primarily because it is asynchronous both in the communication with
 236  * the user and the backend. We think the complexity will pay off in
 237  * the form of greater flexibility when more asynchronous facilities
 238  * are implemented.
 239  *
 240  * Memory management has become somewhat involved. In the simple case, where
 241  * only one PDU is pending at a time, it will simply reuse the same memory,
 242  * once it has found its working size. When we enable multiple concurrent
 243  * operations, perhaps even with multiple parallel calls to the backend, it
 244  * will maintain a pool of buffers for encoding and decoding, trying to
 245  * minimize memory allocation/deallocation during normal operation.
 246  *
 247  * TODOs include (and will be done in order of public interest):
 248  *
 249  * Support for EXPLAIN - provide simple meta-database system.
 250  * Support for access control.
 251  * Support for resource control.
 252  * Support for extended services - primarily Item Order.
 253  * Rest of Z39.50-1994
 254  *
 255  */
 256
 257 #include <yconfig.h>
 258 #include <stdlib.h>
 259 #include <stdio.h>
 260 #ifdef WINDOWS
 261 #include <process.h>
 262 #else
 263 #include <unistd.h>
 264 #endif
 265 #include <assert.h>
 266
 267 #include <xmalloc.h>
 268 #include <comstack.h>
 269 #include "eventl.h"
 270 #include "session.h"
 271 #include <proto.h>
 272 #include <oid.h>
 273 #include <log.h>
 274 #include <statserv.h>
 275
 276 #include <backend.h>
 277
 278 static int process_request(association *assoc, request *req);
 279 void backend_response(IOCHAN i, int event);
 280 static int process_response(association *assoc, request *req, Z_APDU *res);
 281 static Z_APDU *process_initRequest(association *assoc, request *reqb);
 282 static Z_APDU *process_searchRequest(association *assoc, request *reqb,
 283     int *fd);
 284 static Z_APDU *response_searchRequest(association *assoc, request *reqb,
 285     bend_search_rr *bsrr, int *fd);
 286 static Z_APDU *process_presentRequest(association *assoc, request *reqb,
 287     int *fd);
 288 static Z_APDU *process_scanRequest(association *assoc, request *reqb, int *fd);
 289 static Z_APDU *process_sortRequest(association *assoc, request *reqb, int *fd);
 290 static void process_close(association *assoc, request *reqb);
 291 void save_referenceId (request *reqb, Z_ReferenceId *refid);
 292
 293 static FILE *apduf = 0; /* for use in static mode */
 294 static statserv_options_block *control_block = 0;
 295
 296 /*
 297  * Create and initialize a new association-handle.
 298  *  channel  : iochannel for the current line.
 299  *  link     : communications channel.
 300  * Returns: 0 or a new association handle.
 301  */
 302 association *create_association(IOCHAN channel, COMSTACK link)
 303 {
 304     association *anew;
 305
 306     if (!control_block)
 307         control_block = statserv_getcontrol();
 308     if (!(anew = (association *)xmalloc(sizeof(*anew))))
 309         return 0;
 310     anew->client_chan = channel;
 311     anew->client_link = link;
 312     if (!(anew->decode = odr_createmem(ODR_DECODE)) ||
 313         !(anew->encode = odr_createmem(ODR_ENCODE)))
 314         return 0;
 315     if (*control_block->apdufile)
 316     {
 317         char filename[256];
 318         FILE *f;
 319
 320         strcpy(filename, control_block->apdufile);
 321         if (!(anew->print = odr_createmem(ODR_PRINT)))
 322             return 0;
 323         if (*control_block->apdufile != '-')
 324         {
 325             strcpy(filename, control_block->apdufile);
 326             if (!control_block->dynamic)
 327             {
 328                 if (!apduf)
 329                 {
 330                     if (!(apduf = fopen(filename, "w")))
 331                     {
 332                         logf(LOG_WARN|LOG_ERRNO, "%s", filename);
 333                         return 0;
 334                     }
 335                     setvbuf(apduf, 0, _IONBF, 0);
 336                 }
 337                 f = apduf;
 338             }
 339             else
 340             {
 341                 sprintf(filename + strlen(filename), ".%d", getpid());
 342                 if (!(f = fopen(filename, "w")))
 343                 {
 344                     logf(LOG_WARN|LOG_ERRNO, "%s", filename);
 345                     return 0;
 346                 }
 347                 setvbuf(f, 0, _IONBF, 0);
 348             }
 349             odr_setprint(anew->print, f);
 350         }
 351     }
 352     else
 353         anew->print = 0;
 354     anew->input_buffer = 0;
 355     anew->input_buffer_len = 0;
 356     anew->backend = 0;
 357     anew->state = ASSOC_NEW;
 358     request_initq(&anew->incoming);
 359     request_initq(&anew->outgoing);
 360     anew->proto = cs_getproto(link);
 361     return anew;
 362 }
 363
 364 /*
 365  * Free association and release resources.
 366  */
 367 void destroy_association(association *h)
 368 {
 369     odr_destroy(h->decode);
 370     odr_destroy(h->encode);
 371     if (h->print)
 372         odr_destroy(h->print);
 373     if (h->input_buffer)
 374     xfree(h->input_buffer);
 375     if (h->backend)
 376         bend_close(h->backend);
 377     while (request_deq(&h->incoming));
 378     while (request_deq(&h->outgoing));
 379     request_delq(&h->incoming);
 380     request_delq(&h->outgoing);
 381     xfree(h);
 382 }
 383
 384 static void do_close(association *a, int reason, char *message)
 385 {
 386     Z_APDU apdu;
 387     Z_Close *cls = zget_Close(a->encode);
 388     request *req = request_get(&a->outgoing);
 389
 390     /* Purge request queue */
 391     while (request_deq(&a->incoming));
 392     while (request_deq(&a->outgoing));
 393     if (a->version >= 3)
 394     {
 395         logf(LOG_LOG, "Sending Close PDU, reason=%d, message=%s",
 396             reason, message ? message : "none");
 397         apdu.which = Z_APDU_close;
 398         apdu.u.close = cls;
 399         *cls->closeReason = reason;
 400         cls->diagnosticInformation = message;
 401         process_response(a, req, &apdu);
 402         iochan_settimeout(a->client_chan, 60);
 403     }
 404     else
 405     {
 406         logf(LOG_DEBUG, "v2 client. No Close PDU");
 407         iochan_setevent(a->client_chan, EVENT_TIMEOUT); /* force imm close */
 408     }
 409     a->state = ASSOC_DEAD;
 410 }
 411
 412 /*
 413  * This is where PDUs from the client are read and the further
 414  * processing is initiated. Flow of control moves down through the
 415  * various process_* functions below, until the encoded result comes back up
 416  * to the output handler in here.
 417  *
 418  *  h     : the I/O channel that has an outstanding event.
 419  *  event : the current outstanding event.
 420  */
 421 void ir_session(IOCHAN h, int event)
 422 {
 423     int res;
 424     association *assoc = (association *)iochan_getdata(h);
 425     COMSTACK conn = assoc->client_link;
 426     request *req;
 427
 428     assert(h && conn && assoc);
 429     if (event == EVENT_TIMEOUT)
 430     {
 431         if (assoc->state != ASSOC_UP)
 432         {
 433             logf(LOG_LOG, "Final timeout - closing connection.");
 434             cs_close(conn);
 435             destroy_association(assoc);
 436             iochan_destroy(h);
 437         }
 438         else
 439         {
 440             logf(LOG_LOG, "Session idle too long. Sending close.");
 441             do_close(assoc, Z_Close_lackOfActivity, 0);
 442         }
 443         return;
 444     }
 445     if (event & EVENT_INPUT || event & EVENT_WORK) /* input */
 446     {
 447         if (event & EVENT_INPUT)
 448         {
 449             logf(LOG_DEBUG, "ir_session (input)");
 450             assert(assoc && conn);
 451             /* We aren't speaking to this fellow */
 452             if (assoc->state == ASSOC_DEAD)
 453             {
 454                 logf(LOG_LOG, "Closed connection after reject");
 455                 cs_close(conn);
 456                 destroy_association(assoc);
 457                 iochan_destroy(h);
 458                 return;
 459             }
 460             if ((res = cs_get(conn, &assoc->input_buffer,
 461                 &assoc->input_buffer_len)) <= 0)
 462             {
 463                 logf(LOG_LOG, "Connection closed by client");
 464                 cs_close(conn);
 465                 destroy_association(assoc);
 466                 iochan_destroy(h);
 467                 return;
 468             }
 469             else if (res == 1) /* incomplete read - wait for more  */
 470                 return;
 471             if (cs_more(conn)) /* more stuff - call us again later, please */
 472                 iochan_setevent(h, EVENT_INPUT);
 473
 474             /* we got a complete PDU. Let's decode it */
 475             logf(LOG_DEBUG, "Got PDU, %d bytes", res);
 476             req = request_get(&assoc->incoming); /* get a new request structure */
 477             odr_reset(assoc->decode);
 478             odr_setbuf(assoc->decode, assoc->input_buffer, res, 0);
 479             if (!z_APDU(assoc->decode, &req->request, 0))
 480             {
 481                 logf(LOG_LOG, "ODR error on incoming PDU: %s [near byte %d] ",
 482                     odr_errmsg(odr_geterror(assoc->decode)),
 483                     odr_offset(assoc->decode));
 484                 logf(LOG_LOG, "PDU dump:");
 485                 odr_dumpBER(log_file(), assoc->input_buffer, res);
 486                 do_close(assoc, Z_Close_protocolError, "Malformed package");
 487                 return;
 488             }
 489             req->request_mem = odr_extract_mem(assoc->decode);
 490             if (assoc->print && !z_APDU(assoc->print, &req->request, 0))
 491             {
 492                 logf(LOG_WARN, "ODR print error: %s",
 493                     odr_errmsg(odr_geterror(assoc->print)));
 494                 odr_reset(assoc->print);
 495             }
 496             request_enq(&assoc->incoming, req);
 497         }
 498
 499         /* can we do something yet? */
 500         req = request_head(&assoc->incoming);
 501         if (req->state == REQUEST_IDLE)
 502         {
 503             request_deq(&assoc->incoming);
 504             if (process_request(assoc, req) < 0)
 505                 do_close(assoc, Z_Close_systemProblem, "Unknown error");
 506         }
 507     }
 508     if (event & EVENT_OUTPUT)
 509     {
 510         request *req = request_head(&assoc->outgoing);
 511
 512         logf(LOG_DEBUG, "ir_session (output)");
 513         req->state = REQUEST_PENDING;
 514         switch (res = cs_put(conn, req->response, req->len_response))
 515         {
 516             case -1:
 517                 logf(LOG_LOG, "Connection closed by client");
 518                 cs_close(conn);
 519                 destroy_association(assoc);
 520                 iochan_destroy(h);
 521                 break;
 522             case 0: /* all sent - release the request structure */
 523                 logf(LOG_DEBUG, "Wrote PDU, %d bytes", req->len_response);
 524                 nmem_destroy(req->request_mem);
 525                 request_deq(&assoc->outgoing);
 526                 request_release(req);
 527                 if (!request_head(&assoc->outgoing))
 528                     iochan_clearflag(h, EVENT_OUTPUT);
 529                 break;
 530             /* value of 1 -- partial send -- is simply ignored */
 531         }
 532     }
 533     if (event & EVENT_EXCEPT)
 534     {
 535         logf(LOG_DEBUG, "ir_session (exception)");
 536         cs_close(conn);
 537         destroy_association(assoc);
 538         iochan_destroy(h);
 539     }
 540 }
 541
 542 /*
 543  * Initiate request processing.
 544  */
 545 static int process_request(association *assoc, request *req)
 546 {
 547     int fd = -1;
 548     Z_APDU *res;
 549     int retval;
 550
 551     assert(req && req->state == REQUEST_IDLE);
 552     switch (req->request->which)
 553     {
 554         case Z_APDU_initRequest:
 555             res = process_initRequest(assoc, req); break;
 556         case Z_APDU_searchRequest:
 557             res = process_searchRequest(assoc, req, &fd); break;
 558         case Z_APDU_presentRequest:
 559             res = process_presentRequest(assoc, req, &fd); break;
 560         case Z_APDU_scanRequest:
 561             res = process_scanRequest(assoc, req, &fd); break;
 562         case Z_APDU_sortRequest:
 563             if (assoc->bend_sort)
 564                 res = process_sortRequest(assoc, req, &fd);
 565             else
 566             {
 567                 logf(LOG_WARN, "Cannot handle SORT APDU");
 568                 return -1;
 569             }
 570             break;
 571         case Z_APDU_close:
 572             process_close(assoc, req); return 0;
 573         default:
 574             logf(LOG_WARN, "Bad APDU received");
 575             return -1;
 576     }
 577     if (res)
 578     {
 579         logf(LOG_DEBUG, "  result immediately available");
 580         retval = process_response(assoc, req, res);
 581     }
 582     else if (fd < 0)
 583     {
 584         logf(LOG_DEBUG, "  result unavailble");
 585         retval = 0;
 586     }
 587     else /* no result yet - one will be provided later */
 588     {
 589         IOCHAN chan;
 590
 591         /* Set up an I/O handler for the fd supplied by the backend */
 592
 593         logf(LOG_DEBUG, "   establishing handler for result");
 594         req->state = REQUEST_PENDING;
 595         if (!(chan = iochan_create(fd, backend_response, EVENT_INPUT)))
 596             abort();
 597         iochan_setdata(chan, assoc);
 598         retval = 0;
 599     }
 600     return retval;
 601 }
 602
 603 /*
 604  * Handle message from the backend.
 605  */
 606 void backend_response(IOCHAN i, int event)
 607 {
 608     association *assoc = (association *)iochan_getdata(i);
 609     request *req = request_head(&assoc->incoming);
 610     Z_APDU *res;
 611     int fd;
 612
 613     logf(LOG_DEBUG, "backend_response");
 614     assert(assoc && req && req->state != REQUEST_IDLE);
 615     /* determine what it is we're waiting for */
 616     switch (req->request->which)
 617     {
 618         case Z_APDU_searchRequest:
 619             res = response_searchRequest(assoc, req, 0, &fd); break;
 620 #if 0
 621         case Z_APDU_presentRequest:
 622             res = response_presentRequest(assoc, req, 0, &fd); break;
 623         case Z_APDU_scanRequest:
 624             res = response_scanRequest(assoc, req, 0, &fd); break;
 625 #endif
 626         default:
 627             logf(LOG_WARN, "Serious programmer's lapse or bug");
 628             abort();
 629     }
 630     if ((res && process_response(assoc, req, res) < 0) || fd < 0)
 631     {
 632         logf(LOG_LOG, "Fatal error when talking to backend");
 633         do_close(assoc, Z_Close_systemProblem, 0);
 634         iochan_destroy(i);
 635         return;
 636     }
 637     else if (!res) /* no result yet - try again later */
 638     {
 639         logf(LOG_DEBUG, "   no result yet");
 640         iochan_setfd(i, fd); /* in case fd has changed */
 641     }
 642 }
 643
 644 /*
 645  * Encode response, and transfer the request structure to the outgoing queue.
 646  */
 647 static int process_response(association *assoc, request *req, Z_APDU *res)
 648 {
 649     odr_setbuf(assoc->encode, req->response, req->size_response, 1);
 650     if (!z_APDU(assoc->encode, &res, 0))
 651     {
 652         logf(LOG_WARN, "ODR error when encoding response: %s",
 653             odr_errmsg(odr_geterror(assoc->decode)));
 654         odr_reset(assoc->encode);
 655         return -1;
 656     }
 657     req->response = odr_getbuf(assoc->encode, &req->len_response,
 658         &req->size_response);
 659     odr_setbuf(assoc->encode, 0, 0, 0); /* don'txfree if we abort later */
 660     odr_reset(assoc->encode);
 661     if (assoc->print && !z_APDU(assoc->print, &res, 0))
 662     {
 663         logf(LOG_WARN, "ODR print error: %s",
 664             odr_errmsg(odr_geterror(assoc->print)));
 665         odr_reset(assoc->print);
 666     }
 667     req->state = REQUEST_IDLE;
 668     request_enq(&assoc->outgoing, req);
 669     /* turn the work over to the ir_session handler */
 670     iochan_setflag(assoc->client_chan, EVENT_OUTPUT);
 671     /* Is there more work to be done? give that to the input handler too */
 672 #if 1
 673     if (request_head(&assoc->incoming))
 674     {
 675         logf (LOG_DEBUG, "more work to be done");
 676         iochan_setevent(assoc->client_chan, EVENT_WORK);
 677     }
 678 #endif
 679     return 0;
 680 }
 681
 682 /*
 683  * Handle init request.
 684  * At the moment, we don't check the options
 685  * anywhere else in the code - we just try not to do anything that would
 686  * break a naive client. We'll toss 'em into the association block when
 687  * we need them there.
 688  */
 689 static Z_APDU *process_initRequest(association *assoc, request *reqb)
 690 {
 691     Z_InitRequest *req = reqb->request->u.initRequest;
 692     Z_APDU *apdu = zget_APDU(assoc->encode, Z_APDU_initResponse);
 693     Z_InitResponse *resp = apdu->u.initResponse;
 694     bend_initrequest binitreq;
 695     bend_initresult *binitres;
 696     char options[100];
 697
 698     logf(LOG_LOG, "Got initRequest");
 699     if (req->implementationId)
 700         logf(LOG_LOG, "Id:        %s", req->implementationId);
 701     if (req->implementationName)
 702         logf(LOG_LOG, "Name:      %s", req->implementationName);
 703     if (req->implementationVersion)
 704         logf(LOG_LOG, "Version:   %s", req->implementationVersion);
 705
 706     binitreq.stream = assoc->encode;
 707     binitreq.configname = "default-config";
 708     binitreq.auth = req->idAuthentication;
 709     binitreq.bend_sort = NULL;
 710     binitreq.bend_search = NULL;
 711     binitreq.bend_present = NULL;
 712     if (!(binitres = bend_init(&binitreq)))
 713     {
 714         logf(LOG_WARN, "Bad response from backend.");
 715         return 0;
 716     }
 717
 718     assoc->backend = binitres->handle;
 719     if ((assoc->bend_sort = (int (*)())binitreq.bend_sort))
 720         logf (LOG_DEBUG, "Sort handler installed");
 721     if ((assoc->bend_search = (int (*)())binitreq.bend_search))
 722         logf (LOG_DEBUG, "Search handler installed");
 723     if ((assoc->bend_present = (int (*)())binitreq.bend_present))
 724         logf (LOG_DEBUG, "Present handler installed");
 725     resp->referenceId = req->referenceId;
 726     *options = '\0';
 727     /* let's tell the client what we can do */
 728     if (ODR_MASK_GET(req->options, Z_Options_search))
 729     {
 730         ODR_MASK_SET(resp->options, Z_Options_search);
 731         strcat(options, "srch");
 732     }
 733     if (ODR_MASK_GET(req->options, Z_Options_present))
 734     {
 735         ODR_MASK_SET(resp->options, Z_Options_present);
 736         strcat(options, " prst");
 737     }
 738 #if 0
 739     if (ODR_MASK_GET(req->options, Z_Options_delSet))
 740     {
 741         ODR_MASK_SET(&options, Z_Options_delSet);
 742         strcat(options, " del");
 743     }
 744 #endif
 745     if (ODR_MASK_GET(req->options, Z_Options_namedResultSets))
 746     {
 747         ODR_MASK_SET(resp->options, Z_Options_namedResultSets);
 748         strcat(options, " namedresults");
 749     }
 750     if (ODR_MASK_GET(req->options, Z_Options_scan))
 751     {
 752         ODR_MASK_SET(resp->options, Z_Options_scan);
 753         strcat(options, " scan");
 754     }
 755     if (ODR_MASK_GET(req->options, Z_Options_concurrentOperations))
 756     {
 757         ODR_MASK_SET(resp->options, Z_Options_concurrentOperations);
 758         strcat(options, " concurop");
 759     }
 760     if (ODR_MASK_GET(req->options, Z_Options_sort && binitreq.bend_sort))
 761     {
 762         ODR_MASK_SET(resp->options, Z_Options_sort);
 763         strcat(options, " sort");
 764     }
 765     if (ODR_MASK_GET(req->protocolVersion, Z_ProtocolVersion_1))
 766     {
 767         ODR_MASK_SET(resp->protocolVersion, Z_ProtocolVersion_1);
 768         assoc->version = 2; /* 1 & 2 are equivalent */
 769     }
 770     if (ODR_MASK_GET(req->protocolVersion, Z_ProtocolVersion_2))
 771     {
 772         ODR_MASK_SET(resp->protocolVersion, Z_ProtocolVersion_2);
 773         assoc->version = 2;
 774     }
 775     if (ODR_MASK_GET(req->protocolVersion, Z_ProtocolVersion_3))
 776     {
 777         ODR_MASK_SET(resp->protocolVersion, Z_ProtocolVersion_3);
 778         assoc->version = 3;
 779     }
 780     logf(LOG_LOG, "Negotiated to v%d: %s", assoc->version, options);
 781     assoc->maximumRecordSize = *req->maximumRecordSize;
 782     if (assoc->maximumRecordSize > control_block->maxrecordsize)
 783         assoc->maximumRecordSize = control_block->maxrecordsize;
 784     assoc->preferredMessageSize = *req->preferredMessageSize;
 785     if (assoc->preferredMessageSize > assoc->maximumRecordSize)
 786         assoc->preferredMessageSize = assoc->maximumRecordSize;
 787     resp->preferredMessageSize = &assoc->preferredMessageSize;
 788     resp->maximumRecordSize = &assoc->maximumRecordSize;
 789     resp->implementationName = "Index Data/YAZ Generic Frontend Server";
 790     if (binitres->errcode)
 791     {
 792         logf(LOG_LOG, "Connection rejected by backend.");
 793         *resp->result = 0;
 794         assoc->state = ASSOC_DEAD;
 795     }
 796     else
 797         assoc->state = ASSOC_UP;
 798     return apdu;
 799 }
 800
 801 /*
 802  * These functions should be merged.
 803  */
 804
 805 /*
 806  * nonsurrogate diagnostic record.
 807  */
 808 static Z_Records *diagrec(association *assoc, int error, char *addinfo)
 809 {
 810     int oid[OID_SIZE];
 811     Z_Records *rec = (Z_Records *)odr_malloc (assoc->encode, sizeof(*rec));
 812     oident bib1;
 813     int *err = (int *)odr_malloc (assoc->encode, sizeof(*err));
 814     Z_DiagRec *drec = (Z_DiagRec *)odr_malloc (assoc->encode, sizeof(*drec));
 815     Z_DefaultDiagFormat *dr = (Z_DefaultDiagFormat *)odr_malloc (assoc->encode, sizeof(*dr));
 816
 817     bib1.proto = assoc->proto;
 818     bib1.oclass = CLASS_DIAGSET;
 819     bib1.value = VAL_BIB1;
 820
 821     logf(LOG_DEBUG, "Diagnostic: %d -- %s", error, addinfo ? addinfo :
 822         "NULL");
 823     *err = error;
 824     rec->which = Z_Records_NSD;
 825 #ifdef Z_95
 826     rec->u.nonSurrogateDiagnostic = drec;
 827     drec->which = Z_DiagRec_defaultFormat;
 828     drec->u.defaultFormat = dr;
 829 #else
 830     rec->u.nonSurrogateDiagnostic = dr;
 831 #endif
 832     dr->diagnosticSetId = odr_oiddup (assoc->encode,
 833                                       oid_ent_to_oid(&bib1, oid));
 834     dr->condition = err;
 835     dr->which = Z_DiagForm_v2AddInfo;
 836     dr->addinfo = addinfo ? addinfo : "";
 837     return rec;
 838 }
 839
 840 /*
 841  * surrogate diagnostic.
 842  */
 843 static Z_NamePlusRecord *surrogatediagrec(association *assoc, char *dbname,
 844                                             int error, char *addinfo)
 845 {
 846     int oid[OID_SIZE];
 847     Z_NamePlusRecord *rec = (Z_NamePlusRecord *)odr_malloc (assoc->encode, sizeof(*rec));
 848     int *err = (int *)odr_malloc (assoc->encode, sizeof(*err));
 849     oident bib1;
 850     Z_DiagRec *drec = (Z_DiagRec *)odr_malloc (assoc->encode, sizeof(*drec));
 851     Z_DefaultDiagFormat *dr = (Z_DefaultDiagFormat *)odr_malloc (assoc->encode, sizeof(*dr));
 852
 853     bib1.proto = assoc->proto;
 854     bib1.oclass = CLASS_DIAGSET;
 855     bib1.value = VAL_BIB1;
 856
 857     logf(LOG_DEBUG, "SurrogateDiagnotic: %d -- %s", error, addinfo);
 858     *err = error;
 859     rec->databaseName = dbname;
 860     rec->which = Z_NamePlusRecord_surrogateDiagnostic;
 861     rec->u.surrogateDiagnostic = drec;
 862     drec->which = Z_DiagRec_defaultFormat;
 863     drec->u.defaultFormat = dr;
 864     dr->diagnosticSetId = odr_oiddup (assoc->encode,
 865                                       oid_ent_to_oid(&bib1, oid));
 866     dr->condition = err;
 867     dr->which = Z_DiagForm_v2AddInfo;
 868     dr->addinfo = addinfo ? addinfo : "";
 869     return rec;
 870 }
 871
 872 /*
 873  * multiple nonsurrogate diagnostics.
 874  */
 875 static Z_DiagRecs *diagrecs(association *assoc, int error, char *addinfo)
 876 {
 877     int oid[OID_SIZE];
 878     Z_DiagRecs *recs = (Z_DiagRecs *)odr_malloc (assoc->encode, sizeof(*recs));
 879     int *err = (int *)odr_malloc (assoc->encode, sizeof(*err));
 880     oident bib1;
 881     Z_DiagRec **recp = (Z_DiagRec **)odr_malloc (assoc->encode, sizeof(*recp));
 882     Z_DiagRec *drec = (Z_DiagRec *)odr_malloc (assoc->encode, sizeof(*drec));
 883     Z_DefaultDiagFormat *rec = (Z_DefaultDiagFormat *)odr_malloc (assoc->encode, sizeof(*rec));
 884
 885     logf(LOG_DEBUG, "DiagRecs: %d -- %s", error, addinfo);
 886     bib1.proto = assoc->proto;
 887     bib1.oclass = CLASS_DIAGSET;
 888     bib1.value = VAL_BIB1;
 889
 890     *err = error;
 891     recs->num_diagRecs = 1;
 892     recs->diagRecs = recp;
 893     recp[0] = drec;
 894     drec->which = Z_DiagRec_defaultFormat;
 895     drec->u.defaultFormat = rec;
 896
 897     rec->diagnosticSetId = odr_oiddup (assoc->encode,
 898                                       oid_ent_to_oid(&bib1, oid));
 899     rec->condition = err;
 900     rec->which = Z_DiagForm_v2AddInfo;
 901     rec->addinfo = addinfo ? addinfo : "";
 902     return recs;
 903 }
 904
 905 static Z_Records *pack_records(association *a, char *setname, int start,
 906                                 int *num, Z_RecordComposition *comp,
 907                                 int *next, int *pres, oid_value format)
 908 {
 909     int oid[OID_SIZE];
 910     int recno, total_length = 0, toget = *num, dumped_records = 0;
 911     Z_Records *records = (Z_Records *)odr_malloc (a->encode, sizeof(*records));
 912     Z_NamePlusRecordList *reclist = (Z_NamePlusRecordList *)odr_malloc (a->encode, sizeof(*reclist));
 913     Z_NamePlusRecord **list = (Z_NamePlusRecord **)odr_malloc (a->encode, sizeof(*list) * toget);
 914     oident recform;
 915
 916     records->which = Z_Records_DBOSD;
 917     records->u.databaseOrSurDiagnostics = reclist;
 918     reclist->num_records = 0;
 919     reclist->records = list;
 920     *pres = Z_PRES_SUCCESS;
 921     *num = 0;
 922     *next = 0;
 923
 924     logf(LOG_DEBUG, "Request to pack %d+%d", start, toget);
 925     logf(LOG_DEBUG, "pms=%d, mrs=%d", a->preferredMessageSize,
 926         a->maximumRecordSize);
 927     for (recno = start; reclist->num_records < toget; recno++)
 928     {
 929         bend_fetchrequest freq;
 930         bend_fetchresult *fres;
 931         Z_NamePlusRecord *thisrec;
 932         Z_DatabaseRecord *thisext;
 933         int this_length;
 934
 935         /*
 936          * we get the number of bytes allocated on the stream before any
 937          * allocation done by the backend - this should give us a reasonable
 938          * idea of the total size of the data so far.
 939          */
 940         total_length = odr_total(a->encode) - dumped_records;
 941         freq.setname = setname;
 942         freq.number = recno;
 943         freq.comp = comp;
 944         freq.format = format;
 945         freq.stream = a->encode;
 946         if (!(fres = bend_fetch(a->backend, &freq, 0)))
 947         {
 948             *pres = Z_PRES_FAILURE;
 949             return diagrec(a, 2, "Backend interface problem");
 950         }
 951         /* backend should be able to signal whether error is system-wide
 952            or only pertaining to current record */
 953         if (fres->errcode)
 954         {
 955             *pres = Z_PRES_FAILURE;
 956             return diagrec(a, fres->errcode, fres->errstring);
 957         }
 958         if (fres->len >= 0)
 959             this_length = fres->len;
 960         else
 961             this_length = odr_total(a->encode) - total_length;
 962         logf(LOG_DEBUG, "  fetched record, len=%d, total=%d",
 963             this_length, total_length);
 964         if (this_length + total_length > a->preferredMessageSize)
 965         {
 966             /* record is small enough, really */
 967             if (this_length <= a->preferredMessageSize)
 968             {
 969                 logf(LOG_DEBUG, "  Dropped last normal-sized record");
 970                 *pres = Z_PRES_PARTIAL_2;
 971                 break;
 972             }
 973             /* record can only be fetched by itself */
 974             if (this_length < a->maximumRecordSize)
 975             {
 976                 logf(LOG_DEBUG, "  Record > prefmsgsz");
 977                 if (toget > 1)
 978                 {
 979                     logf(LOG_DEBUG, "  Dropped it");
 980                     reclist->records[reclist->num_records] =
 981                          surrogatediagrec(a, fres->basename, 16, 0);
 982                     reclist->num_records++;
 983                     *next = fres->last_in_set ? 0 : recno + 1;
 984                     dumped_records += this_length;
 985                     continue;
 986                 }
 987             }
 988             else /* too big entirely */
 989             {
 990                 logf(LOG_DEBUG, "Record > maxrcdsz");
 991                 reclist->records[reclist->num_records] =
 992                     surrogatediagrec(a, fres->basename, 17, 0);
 993                 reclist->num_records++;
 994                 *next = fres->last_in_set ? 0 : recno + 1;
 995                 dumped_records += this_length;
 996                 continue;
 997             }
 998         }
 999         if (!(thisrec = (Z_NamePlusRecord *)odr_malloc(a->encode, sizeof(*thisrec))))
1000             return 0;
1001         if (!(thisrec->databaseName = (char *)odr_malloc(a->encode,
1002             strlen(fres->basename) + 1)))
1003             return 0;
1004         strcpy(thisrec->databaseName, fres->basename);
1005         thisrec->which = Z_NamePlusRecord_databaseRecord;
1006         if (!(thisrec->u.databaseRecord = thisext = (Z_External *)odr_malloc(a->encode,
1007             sizeof(Z_DatabaseRecord))))
1008             return 0;
1009         recform.proto = a->proto;
1010         recform.oclass = CLASS_RECSYN;
1011         recform.value = fres->format;
1012         thisext->direct_reference = odr_oiddup(a->encode,
1013                                                oid_ent_to_oid(&recform, oid));
1014         thisext->indirect_reference = 0;
1015         thisext->descriptor = 0;
1016         if (fres->len < 0) /* Structured data */
1017         {
1018             switch (fres->format)
1019             {
1020                 case VAL_SUTRS: thisext->which = Z_External_sutrs; break;
1021                 case VAL_GRS1: thisext->which = Z_External_grs1; break;
1022                 case VAL_EXPLAIN: thisext->which = Z_External_explainRecord;
1023                     break;
1024                 case VAL_SUMMARY: thisext->which = Z_External_summary; break;
1025                 case VAL_OPAC: thisext->which = Z_External_OPAC; break;
1026
1027                 default:
1028                     logf(LOG_FATAL, "Unknown structured format from backend.");
1029                     return 0;
1030             }
1031
1032             /*
1033              * We cheat on the pointers here. Obviously, the record field
1034              * of the backend-fetch structure should have been a union for
1035              * correctness, but we're stuck with this for backwards
1036              * compatibility.
1037              */
1038             thisext->u.grs1 = (Z_GenericRecord*) fres->record;
1039         }
1040         else if (fres->format == VAL_SUTRS) /* SUTRS is a single-ASN.1-type */
1041         {
1042             Odr_oct *sutrs = (Odr_oct *)odr_malloc(a->encode, sizeof(*sutrs));
1043
1044             thisext->which = Z_External_sutrs;
1045             thisext->u.sutrs = sutrs;
1046             sutrs->buf = (unsigned char *)odr_malloc(a->encode, fres->len);
1047             sutrs->len = sutrs->size = fres->len;
1048             memcpy(sutrs->buf, fres->record, fres->len);
1049         }
1050         else /* octet-aligned record. */
1051         {
1052             thisext->which = Z_External_octet;
1053             if (!(thisext->u.octet_aligned = (Odr_oct *)odr_malloc(a->encode,
1054                 sizeof(Odr_oct))))
1055                 return 0;
1056             if (!(thisext->u.octet_aligned->buf = (unsigned char *)odr_malloc(a->encode,
1057                 fres->len)))
1058                 return 0;
1059             memcpy(thisext->u.octet_aligned->buf, fres->record, fres->len);
1060             thisext->u.octet_aligned->len = thisext->u.octet_aligned->size =
1061                 fres->len;
1062         }
1063         reclist->records[reclist->num_records] = thisrec;
1064         reclist->num_records++;
1065         *next = fres->last_in_set ? 0 : recno + 1;
1066     }
1067     *num = reclist->num_records;
1068     return records;
1069 }
1070
1071 static Z_APDU *process_searchRequest(association *assoc, request *reqb,
1072     int *fd)
1073 {
1074     Z_SearchRequest *req = reqb->request->u.searchRequest;
1075     bend_search_rr *bsrr = (bend_search_rr *)nmem_malloc (reqb->request_mem, sizeof(*bsrr));
1076
1077     logf(LOG_LOG, "Got SearchRequest.");
1078     save_referenceId (reqb, req->referenceId);
1079     /* store ref id in request */
1080     bsrr->fd = fd;
1081     bsrr->request = reqb;
1082     bsrr->association = assoc;
1083     if (assoc->bend_search)
1084     {
1085         bsrr->setname = req->resultSetName;
1086         bsrr->replace_set = *req->replaceIndicator;
1087         bsrr->num_bases = req->num_databaseNames;
1088         bsrr->basenames = req->databaseNames;
1089         bsrr->query = req->query;
1090         bsrr->stream = assoc->encode;
1091         bsrr->errcode = 0;
1092         bsrr->hits = 0;
1093         bsrr->errstring = NULL;
1094         ((int (*)(void *, bend_search_rr *))(assoc->bend_search))(assoc->backend, bsrr);
1095         if (!bsrr->request)
1096             return 0;
1097     }
1098     else
1099     {
1100         bend_searchrequest bsrq;
1101         bend_searchresult *bsrt;
1102
1103         bsrq.setname = req->resultSetName;
1104         bsrq.replace_set = *req->replaceIndicator;
1105         bsrq.num_bases = req->num_databaseNames;
1106         bsrq.basenames = req->databaseNames;
1107         bsrq.query = req->query;
1108         bsrq.stream = assoc->encode;
1109         if (!(bsrt = bend_search(assoc->backend, &bsrq, fd)))
1110             return 0;
1111         bsrr->hits = bsrt->hits;
1112         bsrr->errcode = bsrt->errcode;
1113         bsrr->errstring = bsrt->errstring;
1114     }
1115     return response_searchRequest(assoc, reqb, bsrr, fd);
1116 }
1117
1118 int bend_searchresponse(void *handle, bend_search_rr *bsrr) {return 0;}
1119
1120 /*
1121  * Prepare a searchresponse based on the backend results. We probably want
1122  * to look at making the fetching of records nonblocking as well, but
1123  * so far, we'll keep things simple.
1124  * If bsrt is null, that means we're called in response to a communications
1125  * event, and we'll have to get the response for ourselves.
1126  */
1127 static Z_APDU *response_searchRequest(association *assoc, request *reqb,
1128     bend_search_rr *bsrt, int *fd)
1129 {
1130     Z_SearchRequest *req = reqb->request->u.searchRequest;
1131     Z_APDU *apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1132     Z_SearchResponse *resp = (Z_SearchResponse *)odr_malloc (assoc->encode, sizeof(*resp));
1133     int *nulint = (int *)odr_malloc (assoc->encode, sizeof(*nulint));
1134     bool_t *sr = (bool_t *)odr_malloc (assoc->encode, sizeof(*sr));
1135     int *next = (int *)odr_malloc (assoc->encode, sizeof(*next));
1136     int *none = (int *)odr_malloc (assoc->encode, sizeof(*none));
1137
1138     *nulint = 0;
1139     *sr = 1;
1140     *next = 0;
1141     *none = Z_RES_NONE;
1142
1143     apdu->which = Z_APDU_searchResponse;
1144     apdu->u.searchResponse = resp;
1145     resp->referenceId = req->referenceId;
1146     resp->additionalSearchInfo = 0;
1147     resp->otherInfo = 0;
1148     *fd = -1;
1149     if (!bsrt && !bend_searchresponse(assoc->backend, bsrt))
1150     {
1151         logf(LOG_FATAL, "Bad result from backend");
1152         return 0;
1153     }
1154     else if (bsrt->errcode)
1155     {
1156         resp->records = diagrec(assoc, bsrt->errcode, bsrt->errstring);
1157         resp->resultCount = nulint;
1158         resp->numberOfRecordsReturned = nulint;
1159         resp->nextResultSetPosition = nulint;
1160         resp->searchStatus = nulint;
1161         resp->resultSetStatus = none;
1162         resp->presentStatus = 0;
1163     }
1164     else
1165     {
1166         int *toget = (int *)odr_malloc (assoc->encode, sizeof(*toget));
1167         int *presst = (int *)odr_malloc (assoc->encode, sizeof(*presst));
1168         Z_RecordComposition comp, *compp = 0;
1169
1170         *toget = 0;
1171         *presst = 0;
1172         resp->records = 0;
1173         resp->resultCount = &bsrt->hits;
1174
1175         comp.which = Z_RecordComp_simple;
1176         /* how many records does the user agent want, then? */
1177         if (bsrt->hits <= *req->smallSetUpperBound)
1178         {
1179             *toget = bsrt->hits;
1180             if ((comp.u.simple = req->smallSetElementSetNames))
1181                 compp = &comp;
1182         }
1183         else if (bsrt->hits < *req->largeSetLowerBound)
1184         {
1185             *toget = *req->mediumSetPresentNumber;
1186             if (*toget > bsrt->hits)
1187                 *toget = bsrt->hits;
1188             if ((comp.u.simple = req->mediumSetElementSetNames))
1189                 compp = &comp;
1190         }
1191         else
1192             *toget = 0;
1193
1194         if (*toget && !resp->records)
1195         {
1196             oident *prefformat;
1197             oid_value form;
1198
1199             if (!(prefformat = oid_getentbyoid(req->preferredRecordSyntax)) ||
1200                 prefformat->oclass != CLASS_RECSYN)
1201                 form = VAL_NONE;
1202             else
1203                 form = prefformat->value;
1204             resp->records = pack_records(assoc, req->resultSetName, 1,
1205                 toget, compp, next, presst, form);
1206             if (!resp->records)
1207                 return 0;
1208             resp->numberOfRecordsReturned = toget;
1209             resp->nextResultSetPosition = next;
1210             resp->searchStatus = sr;
1211             resp->resultSetStatus = 0;
1212             resp->presentStatus = presst;
1213         }
1214         else
1215         {
1216             if (*resp->resultCount)
1217                 *next = 1;
1218             resp->numberOfRecordsReturned = nulint;
1219             resp->nextResultSetPosition = next;
1220             resp->searchStatus = sr;
1221             resp->resultSetStatus = 0;
1222             resp->presentStatus = 0;
1223         }
1224     }
1225     return apdu;
1226 }
1227
1228 /*
1229  * Maybe we got a little over-friendly when we designed bend_fetch to
1230  * get only one record at a time. Some backends can optimise multiple-record
1231  * fetches, and at any rate, there is some overhead involved in
1232  * all that selecting and hopping around. Problem is, of course, that the
1233  * frontend can't know ahead of time how many records it'll need to
1234  * fill the negotiated PDU size. Annoying. Segmentation or not, Z/SR
1235  * is downright lousy as a bulk data transfer protocol.
1236  *
1237  * To start with, we'll do the fetching of records from the backend
1238  * in one operation: To save some trips in and out of the event-handler,
1239  * and to simplify the interface to pack_records. At any rate, asynch
1240  * operation is more fun in operations that have an unpredictable execution
1241  * speed - which is normally more true for search than for present.
1242  */
1243 static Z_APDU *process_presentRequest(association *assoc, request *reqb,
1244     int *fd)
1245 {
1246     Z_PresentRequest *req = reqb->request->u.presentRequest;
1247     oident *prefformat;
1248     oid_value form;
1249     Z_APDU *apdu;
1250     Z_PresentResponse *resp;
1251     int *presst;
1252     int *next;
1253     int *num;
1254
1255     logf(LOG_LOG, "Got PresentRequest.");
1256
1257     if (!(prefformat = oid_getentbyoid(req->preferredRecordSyntax)) ||
1258         prefformat->oclass != CLASS_RECSYN)
1259         form = VAL_NONE;
1260     else
1261         form = prefformat->value;
1262     if (assoc->bend_present)
1263     {
1264         bend_present_rr *bprr = (bend_present_rr *)nmem_malloc (reqb->request_mem, sizeof(*bprr));
1265         bprr->setname = req->resultSetId;
1266         bprr->start = *req->resultSetStartPoint;
1267         bprr->number = *req->numberOfRecordsRequested;
1268         bprr->format = form;
1269         bprr->comp = req->recordComposition;
1270         bprr->stream = assoc->encode;
1271         bprr->request = reqb;
1272         bprr->association = assoc;
1273         bprr->errcode = 0;
1274         bprr->errstring = NULL;
1275         ((int (*)(void *, bend_present_rr *))(*assoc->bend_present))(assoc->backend, bprr);
1276
1277         if (!bprr->request)
1278             return 0;
1279     }
1280     apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1281     resp = (Z_PresentResponse *)odr_malloc (assoc->encode, sizeof(*resp));
1282     presst = (int *)odr_malloc (assoc->encode, sizeof(*presst));
1283     next = (int *)odr_malloc (assoc->encode, sizeof(*next));
1284     num = (int *)odr_malloc (assoc->encode, sizeof(*num));
1285     *presst = 0;
1286     *next = 0;
1287     *num = *req->numberOfRecordsRequested;
1288
1289     apdu->which = Z_APDU_presentResponse;
1290     apdu->u.presentResponse = resp;
1291     resp->referenceId = req->referenceId;
1292     resp->otherInfo = 0;
1293
1294     resp->records =
1295         pack_records(assoc, req->resultSetId, *req->resultSetStartPoint,
1296                      num, req->recordComposition, next, presst, form);
1297     if (!resp->records)
1298         return 0;
1299     resp->numberOfRecordsReturned = num;
1300     resp->presentStatus = presst;
1301     resp->nextResultSetPosition = next;
1302
1303     return apdu;
1304 }
1305
1306 /*
1307  * Scan was implemented rather in a hurry, and with support for only the basic
1308  * elements of the service in the backend API. Suggestions are welcome.
1309  */
1310 static Z_APDU *process_scanRequest(association *assoc, request *reqb, int *fd)
1311 {
1312     Z_ScanRequest *req = reqb->request->u.scanRequest;
1313     Z_APDU *apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1314     Z_ScanResponse *res = (Z_ScanResponse *)odr_malloc (assoc->encode, sizeof(*res));
1315     int *scanStatus = (int *)odr_malloc (assoc->encode, sizeof(*scanStatus));
1316     int *numberOfEntriesReturned =
1317          (int *)odr_malloc (assoc->encode, sizeof(*numberOfEntriesReturned));
1318     Z_ListEntries *ents = (Z_ListEntries *)odr_malloc (assoc->encode, sizeof(*ents));
1319     oident *attent;
1320     bend_scanrequest srq;
1321     bend_scanresult *srs;
1322     oident *attset;
1323
1324     logf(LOG_LOG, "Got ScanRequest");
1325     *scanStatus = Z_Scan_failure;
1326     *numberOfEntriesReturned = 0;
1327
1328     apdu->which = Z_APDU_scanResponse;
1329     apdu->u.scanResponse = res;
1330     res->referenceId = req->referenceId;
1331     res->stepSize = 0;
1332     res->scanStatus = scanStatus;
1333     res->numberOfEntriesReturned = numberOfEntriesReturned;
1334     res->positionOfTerm = 0;
1335     res->entries = ents;
1336     ents->which = Z_ListEntries_nonSurrogateDiagnostics;
1337     res->attributeSet = 0;
1338     res->otherInfo = 0;
1339
1340     if (req->attributeSet && (!(attent = oid_getentbyoid(req->attributeSet)) ||
1341         attent->oclass != CLASS_ATTSET || attent->value != VAL_BIB1))
1342         ents->u.nonSurrogateDiagnostics = diagrecs(assoc, 121, 0);
1343     else if (req->stepSize && *req->stepSize > 0)
1344         ents->u.nonSurrogateDiagnostics = diagrecs(assoc, 205, 0);
1345     else
1346     {
1347         if (req->termListAndStartPoint->term->which == Z_Term_general)
1348             logf(LOG_DEBUG, " term: '%.*s'",
1349                 req->termListAndStartPoint->term->u.general->len,
1350                 req->termListAndStartPoint->term->u.general->buf);
1351         srq.num_bases = req->num_databaseNames;
1352         srq.basenames = req->databaseNames;
1353         srq.num_entries = *req->numberOfTermsRequested;
1354         srq.term = req->termListAndStartPoint;
1355         srq.stream = assoc->encode;
1356         if (!(attset = oid_getentbyoid(req->attributeSet)) ||
1357             attset->oclass != CLASS_RECSYN)
1358             srq.attributeset = VAL_NONE;
1359         else
1360             srq.attributeset = attset->value;
1361         srq.term_position = req->preferredPositionInResponse ?
1362             *req->preferredPositionInResponse : 1;
1363         if (!(srs = bend_scan(assoc->backend, &srq, 0)))
1364             ents->u.nonSurrogateDiagnostics = diagrecs(assoc, 2, 0);
1365         else if (srs->errcode)
1366             ents->u.nonSurrogateDiagnostics = diagrecs(assoc,
1367                 srs->errcode, srs->errstring);
1368         else
1369         {
1370             int i;
1371             Z_Entries *list = (Z_Entries *)odr_malloc (assoc->encode, sizeof(*list));
1372             Z_Entry **tab = (Z_Entry **)odr_malloc (assoc->encode,
1373                                         sizeof(*tab) * srs->num_entries);
1374
1375             if (srs->status == BEND_SCAN_PARTIAL)
1376                 *scanStatus = Z_Scan_partial_5;
1377             else
1378                 *scanStatus = Z_Scan_success;
1379             ents->which = Z_ListEntries_entries;
1380             ents->u.entries = list;
1381             list->entries = tab;
1382             for (i = 0; i < srs->num_entries; i++)
1383             {
1384                 Z_Entry *e;
1385                 Z_TermInfo *t;
1386                 Odr_oct *o;
1387
1388                 list->entries[i] = e = (Z_Entry *)odr_malloc(assoc->encode, sizeof(*e));
1389                 e->which = Z_Entry_termInfo;
1390                 e->u.termInfo = t = (Z_TermInfo *)odr_malloc(assoc->encode, sizeof(*t));
1391                 t->suggestedAttributes = 0;
1392                 t->displayTerm = 0;
1393                 t->alternativeTerm = 0;
1394                 t->byAttributes = 0;
1395                 t->otherTermInfo = 0;
1396                 t->globalOccurrences = &srs->entries[i].occurrences;
1397                 t->term = (Z_Term *)odr_malloc(assoc->encode, sizeof(*t->term));
1398                 t->term->which = Z_Term_general;
1399                 t->term->u.general = o = (Odr_oct *)odr_malloc(assoc->encode,
1400                     sizeof(Odr_oct));
1401                 o->buf = (unsigned char *)odr_malloc(assoc->encode, o->len = o->size =
1402                     strlen(srs->entries[i].term));
1403                 memcpy(o->buf, srs->entries[i].term, o->len);
1404                 logf(LOG_DEBUG, "  term #%d: '%s' (%d)", i,
1405                     srs->entries[i].term, srs->entries[i].occurrences);
1406             }
1407             list->num_entries = i;
1408             res->numberOfEntriesReturned = &list->num_entries;
1409             res->positionOfTerm = &srs->term_position;
1410         }
1411     }
1412
1413     return apdu;
1414 }
1415
1416 static Z_APDU *process_sortRequest(association *assoc, request *reqb,
1417     int *fd)
1418 {
1419     Z_SortRequest *req = reqb->request->u.sortRequest;
1420     Z_SortResponse *res = (Z_SortResponse *)odr_malloc (assoc->encode, sizeof(*res));
1421     bend_sort_rr *bsrr = (bend_sort_rr *)odr_malloc (assoc->encode, sizeof(*bsrr));
1422
1423     Z_APDU *apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1424
1425     logf(LOG_LOG, "Got SortRequest.");
1426
1427     bsrr->num_input_setnames = req->inputResultSetNames->num_strings;
1428     bsrr->input_setnames = req->inputResultSetNames->strings;
1429     bsrr->output_setname = req->sortedResultSetName;
1430     bsrr->sort_sequence = req->sortSequence;
1431     bsrr->stream = assoc->encode;
1432
1433     bsrr->sort_status = Z_SortStatus_failure;
1434     bsrr->errcode = 0;
1435     bsrr->errstring = 0;
1436
1437     ((int (*)(void *, bend_sort_rr *))(*assoc->bend_sort))(assoc->backend, bsrr);
1438
1439     res->referenceId = req->referenceId;
1440     res->sortStatus = (int *)odr_malloc (assoc->encode, sizeof(*res->sortStatus));
1441     *res->sortStatus = bsrr->sort_status;
1442     res->resultSetStatus = 0;
1443     if (bsrr->errcode)
1444         res->diagnostics = diagrecs(assoc, bsrr->errcode, bsrr->errstring);
1445     else
1446         res->diagnostics = 0;
1447     res->otherInfo = 0;
1448
1449     apdu->which = Z_APDU_sortResponse;
1450     apdu->u.sortResponse = res;
1451     return apdu;
1452 }
1453
1454 static void process_close(association *assoc, request *reqb)
1455 {
1456     Z_Close *req = reqb->request->u.close;
1457     static char *reasons[] =
1458     {
1459         "finished",
1460         "shutdown",
1461         "systemProblem",
1462         "costLimit",
1463         "resources",
1464         "securityViolation",
1465         "protocolError",
1466         "lackOfActivity",
1467         "peerAbort",
1468         "unspecified"
1469     };
1470
1471     logf(LOG_LOG, "Got Close, reason %s, message %s",
1472         reasons[*req->closeReason], req->diagnosticInformation ?
1473         req->diagnosticInformation : "NULL");
1474     if (assoc->version < 3) /* to make do_force respond with close */
1475         assoc->version = 3;
1476     do_close(assoc, Z_Close_finished, "Association terminated by client");
1477 }
1478
1479 void save_referenceId (request *reqb, Z_ReferenceId *refid)
1480 {
1481     if (refid)
1482     {
1483         reqb->len_refid = refid->len;
1484         reqb->refid = (char *)nmem_malloc (reqb->request_mem, refid->len);
1485         memcpy (reqb->refid, refid->buf, refid->len);
1486     }
1487     else
1488     {
1489         reqb->len_refid = 0;
1490         reqb->refid = NULL;
1491     }
1492 }
1493
1494 void bend_request_send (bend_association a, bend_request req, Z_APDU *res)
1495 {
1496     process_response (a, req, res);
1497 }
1498
1499 bend_request bend_request_mk (bend_association a)
1500 {
1501     request *nreq = request_get (&a->outgoing);
1502     nreq->request_mem = nmem_create ();
1503     return nreq;
1504 }
1505
1506 Z_ReferenceId *bend_request_getid (ODR odr, bend_request req)
1507 {
1508     Z_ReferenceId *id;
1509     if (!req->refid)
1510         return 0;
1511     id = (Odr_oct *)odr_malloc (odr, sizeof(*odr));
1512     id->buf = (unsigned char *)odr_malloc (odr, req->len_refid);
1513     id->len = id->size = req->len_refid;
1514     memcpy (id->buf, req->refid, req->len_refid);
1515     return id;
1516 }
1517
1518 void bend_request_destroy (bend_request *req)
1519 {
1520     nmem_destroy((*req)->request_mem);
1521     request_release(*req);
1522     *req = NULL;
1523 }
1524
1525 int bend_backend_respond (bend_association a, bend_request req)
1526 {
1527     return process_request (a, req);
1528 }
1529
1530 void bend_request_setdata(bend_request r, void *p)
1531 {
1532     r->clientData = p;
1533 }
1534
1535 void *bend_request_getdata(bend_request r)
1536 {
1537     return r->clientData;
1538 }