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 1.84  1998-11-16 16:02:32  adam
   8  * Added loggin utilies, log_rpn_query and log_scan_term. These used
   9  * to be part of Zebra.
  10  *
  11  * Revision 1.83  1998/11/03 10:09:36  adam
  12  * Fixed bug regarding YC.
  13  *
  14  * Revision 1.82  1998/10/20 14:00:30  quinn
  15  * Fixed Scan
  16  *
  17  * Revision 1.81  1998/10/13 16:12:24  adam
  18  * Added support for Surrogate Diagnostics for Scan Term entries.
  19  *
  20  * Revision 1.80  1998/09/02 12:41:53  adam
  21  * Added decode stream in bend search structures.
  22  *
  23  * Revision 1.79  1998/08/19 16:10:08  adam
  24  * Changed som member names of DeleteResultSetRequest/Response.
  25  *
  26  * Revision 1.78  1998/08/03 10:23:55  adam
  27  * Fixed bug regarding Options for Sort.
  28  *
  29  * Revision 1.77  1998/07/20 12:38:42  adam
  30  * Implemented delete result set service to server API.
  31  *
  32  * Revision 1.76  1998/05/27 16:57:07  adam
  33  * Support for surrogate diagnostic records added for bend_fetch.
  34  *
  35  * Revision 1.75  1998/05/18 10:13:07  adam
  36  * Fixed call to es_request handler - extra argument was passed.
  37  *
  38  * Revision 1.74  1998/03/31 15:13:20  adam
  39  * Development towards compiled ASN.1.
  40  *
  41  * Revision 1.73  1998/03/31 11:07:45  adam
  42  * Furhter work on UNIverse resource report.
  43  * Added Extended Services handling in frontend server.
  44  *
  45  * Revision 1.72  1998/02/11 11:53:35  adam
  46  * Changed code so that it compiles as C++.
  47  *
  48  * Revision 1.71  1998/02/10 11:03:57  adam
  49  * Added support for extended handlers in backend server interface.
  50  *
  51  * Revision 1.70  1998/01/29 13:15:35  adam
  52  * Implemented sort for the backend interface.
  53  *
  54  * Revision 1.69  1997/09/30 11:48:12  adam
  55  * Fixed bug introduced by previous commit.
  56  *
  57  * Revision 1.68  1997/09/29 13:18:59  adam
  58  * Added function, oid_ent_to_oid, to replace the function
  59  * oid_getoidbyent, which is not thread safe.
  60  *
  61  * Revision 1.67  1997/09/17 12:10:40  adam
  62  * YAZ version 1.4.
  63  *
  64  * Revision 1.66  1997/09/05 15:26:44  adam
  65  * Added ODR encode in search and scen bend request structures.
  66  * Fixed a few enums that caused trouble with C++.
  67  *
  68  * Revision 1.65  1997/09/01 08:53:01  adam
  69  * New windows NT/95 port using MSV5.0. The test server 'ztest' was
  70  * moved a separate directory. MSV5.0 project server.dsp created.
  71  * As an option, the server can now operate as an NT service.
  72  *
  73  * Revision 1.64  1997/04/30 08:52:11  quinn
  74  * Null
  75  *
  76  * Revision 1.63  1996/10/11  11:57:26  quinn
  77  * Smallish
  78  *
  79  * Revision 1.62  1996/07/06  19:58:35  quinn
  80  * System headerfiles gathered in yconfig
  81  *
  82  * Revision 1.61  1996/06/10  08:56:16  quinn
  83  * Work on Summary.
  84  *
  85  * Revision 1.60  1996/05/30  11:03:10  quinn
  86  * Fixed NextresultSetPosition bug fixed.
  87  *
  88  * Revision 1.59  1996/05/14  09:26:46  quinn
  89  * Added attribute set to scan backend
  90  *
  91  * Revision 1.58  1996/02/20  12:53:04  quinn
  92  * Chanes to SCAN
  93  *
  94  * Revision 1.57  1996/01/02  08:57:47  quinn
  95  * Changed enums in the ASN.1 .h files to #defines. Changed oident.class to oclass
  96  *
  97  * Revision 1.56  1995/12/14  11:09:57  quinn
  98  * Work on Explain
  99  *
 100  * Revision 1.55  1995/11/08  17:41:37  quinn
 101  * Smallish.
 102  *
 103  * Revision 1.54  1995/11/08  15:11:29  quinn
 104  * Log of close transmit.
 105  *
 106  * Revision 1.53  1995/11/01  13:54:58  quinn
 107  * Minor adjustments
 108  *
 109  * Revision 1.52  1995/11/01  12:19:13  quinn
 110  * Second attempt to fix same bug.
 111  *
 112  * Revision 1.50  1995/10/25  16:58:32  quinn
 113  * Simple.
 114  *
 115  * Revision 1.49  1995/10/16  13:51:53  quinn
 116  * Changes to provide Especs to the backend.
 117  *
 118  * Revision 1.48  1995/10/06  08:51:20  quinn
 119  * Added Write-buffer.
 120  *
 121  * Revision 1.47  1995/08/29  14:24:16  quinn
 122  * Added second half of close-handshake
 123  *
 124  * Revision 1.46  1995/08/29  11:17:58  quinn
 125  * Added code to receive close
 126  *
 127  * Revision 1.45  1995/08/21  09:11:00  quinn
 128  * Smallish fixes to suppport new formats.
 129  *
 130  * Revision 1.44  1995/08/17  12:45:25  quinn
 131  * Fixed minor problems with GRS-1. Added support in c&s.
 132  *
 133  * Revision 1.43  1995/08/15  12:00:31  quinn
 134  * Updated External
 135  *
 136  * Revision 1.42  1995/08/15  11:16:50  quinn
 137  *
 138  * Revision 1.41  1995/08/02  10:23:06  quinn
 139  * Smallish
 140  *
 141  * Revision 1.40  1995/07/31  14:34:26  quinn
 142  * Fixed bug in process_searchResponse (numberOfRecordsReturned).
 143  *
 144  * Revision 1.39  1995/06/27  13:21:00  quinn
 145  * SUTRS support
 146  *
 147  * Revision 1.38  1995/06/19  12:39:11  quinn
 148  * Fixed bug in timeout code. Added BER dumper.
 149  *
 150  * Revision 1.37  1995/06/16  13:16:14  quinn
 151  * Fixed Defaultdiagformat.
 152  *
 153  * Revision 1.36  1995/06/16  10:31:36  quinn
 154  * Added session timeout.
 155  *
 156  * Revision 1.35  1995/06/15  07:45:14  quinn
 157  * Moving to v3.
 158  *
 159  * Revision 1.34  1995/06/14  15:26:46  quinn
 160  * *** empty log message ***
 161  *
 162  * Revision 1.33  1995/06/06  14:57:05  quinn
 163  * Better diagnostics.
 164  *
 165  * Revision 1.32  1995/06/06  08:41:44  quinn
 166  * Better diagnostics.
 167  *
 168  * Revision 1.31  1995/06/06  08:15:37  quinn
 169  * Cosmetic.
 170  *
 171  * Revision 1.30  1995/06/05  10:53:32  quinn
 172  * Added a better SCAN.
 173  *
 174  * Revision 1.29  1995/06/01  11:25:03  quinn
 175  * Smallish.
 176  *
 177  * Revision 1.28  1995/06/01  11:21:01  quinn
 178  * Attempting to fix a bug in pack-records. replaced break with continue
 179  * for large records, according to standard.
 180  *
 181  * Revision 1.27  1995/05/29  08:12:06  quinn
 182  * Moved oid to util
 183  *
 184  * Revision 1.26  1995/05/18  13:02:12  quinn
 185  * Smallish.
 186  *
 187  * Revision 1.25  1995/05/17  08:42:26  quinn
 188  * Transfer auth info to backend. Allow backend to reject init gracefully.
 189  *
 190  * Revision 1.24  1995/05/16  08:51:04  quinn
 191  * License, documentation, and memory fixes
 192  *
 193  * Revision 1.23  1995/05/15  13:25:10  quinn
 194  * Fixed memory bug.
 195  *
 196  * Revision 1.22  1995/05/15  11:56:39  quinn
 197  * Asynchronous facilities. Restructuring of seshigh code.
 198  *
 199  * Revision 1.21  1995/05/02  08:53:19  quinn
 200  * Trying in vain to fix comm with ISODE
 201  *
 202  * Revision 1.20  1995/04/20  15:13:00  quinn
 203  * Cosmetic
 204  *
 205  * Revision 1.19  1995/04/18  08:15:34  quinn
 206  * Added dynamic memory allocation on encoding (whew). Code is now somewhat
 207  * neater. We'll make the same change for decoding one day.
 208  *
 209  * Revision 1.18  1995/04/17  11:28:25  quinn
 210  * Smallish
 211  *
 212  * Revision 1.17  1995/04/10  10:23:36  quinn
 213  * Some work to add scan and other things.
 214  *
 215  * Revision 1.16  1995/03/31  09:18:55  quinn
 216  * Added logging.
 217  *
 218  * Revision 1.15  1995/03/30  14:03:23  quinn
 219  * Added RFC1006 as separate library
 220  *
 221  * Revision 1.14  1995/03/30  12:18:17  quinn
 222  * Fixed bug.
 223  *
 224  * Revision 1.13  1995/03/30  09:09:24  quinn
 225  * Added state-handle and some support for asynchronous activities.
 226  *
 227  * Revision 1.12  1995/03/29  15:40:16  quinn
 228  * Ongoing work. Statserv is now dynamic by default
 229  *
 230  * Revision 1.11  1995/03/28  09:16:21  quinn
 231  * Added record packing to the search request
 232  *
 233  * Revision 1.10  1995/03/27  08:34:24  quinn
 234  * Added dynamic server functionality.
 235  * Released bindings to session.c (is now redundant)
 236  *
 237  * Revision 1.9  1995/03/22  15:01:26  quinn
 238  * Adjusting record packing.
 239  *
 240  * Revision 1.8  1995/03/22  10:13:21  quinn
 241  * Working on record packer
 242  *
 243  * Revision 1.7  1995/03/21  15:53:31  quinn
 244  * Little changes.
 245  *
 246  * Revision 1.6  1995/03/21  12:30:09  quinn
 247  * Beginning to add support for record packing.
 248  *
 249  * Revision 1.5  1995/03/17  10:44:13  quinn
 250  * Added catch of null-string in makediagrec
 251  *
 252  * Revision 1.4  1995/03/17  10:18:08  quinn
 253  * Added memory management.
 254  *
 255  * Revision 1.3  1995/03/16  17:42:39  quinn
 256  * Little changes
 257  *
 258  * Revision 1.2  1995/03/16  13:29:01  quinn
 259  * Partitioned server.
 260  *
 261  * Revision 1.1  1995/03/15  16:02:10  quinn
 262  * Modded session.c to seshigh.c
 263  *
 264  */
 265
 266 /*
 267  * Frontend server logic.
 268  *
 269  * This code receives incoming APDUs, and handles client requests by means
 270  * of the backend API.
 271  *
 272  * Some of the code is getting quite involved, compared to simpler servers -
 273  * primarily because it is asynchronous both in the communication with
 274  * the user and the backend. We think the complexity will pay off in
 275  * the form of greater flexibility when more asynchronous facilities
 276  * are implemented.
 277  *
 278  * Memory management has become somewhat involved. In the simple case, where
 279  * only one PDU is pending at a time, it will simply reuse the same memory,
 280  * once it has found its working size. When we enable multiple concurrent
 281  * operations, perhaps even with multiple parallel calls to the backend, it
 282  * will maintain a pool of buffers for encoding and decoding, trying to
 283  * minimize memory allocation/deallocation during normal operation.
 284  *
 285  * TODOs include (and will be done in order of public interest):
 286  *
 287  * Support for EXPLAIN - provide simple meta-database system.
 288  * Support for access control.
 289  * Support for resource control.
 290  * Support for extended services - primarily Item Order.
 291  * Rest of Z39.50-1994
 292  *
 293  */
 294
 295 #include <yconfig.h>
 296 #include <stdlib.h>
 297 #include <stdio.h>
 298 #ifdef WINDOWS
 299 #include <process.h>
 300 #else
 301 #include <unistd.h>
 302 #endif
 303 #include <assert.h>
 304
 305 #include <xmalloc.h>
 306 #include <comstack.h>
 307 #include "eventl.h"
 308 #include "session.h"
 309 #include <proto.h>
 310 #include <oid.h>
 311 #include <log.h>
 312 #include <logrpn.h>
 313 #include <statserv.h>
 314
 315 #include <backend.h>
 316
 317 static int process_request(association *assoc, request *req);
 318 void backend_response(IOCHAN i, int event);
 319 static int process_response(association *assoc, request *req, Z_APDU *res);
 320 static Z_APDU *process_initRequest(association *assoc, request *reqb);
 321 static Z_APDU *process_searchRequest(association *assoc, request *reqb,
 322     int *fd);
 323 static Z_APDU *response_searchRequest(association *assoc, request *reqb,
 324     bend_search_rr *bsrr, int *fd);
 325 static Z_APDU *process_presentRequest(association *assoc, request *reqb,
 326     int *fd);
 327 static Z_APDU *process_scanRequest(association *assoc, request *reqb, int *fd);
 328 static Z_APDU *process_sortRequest(association *assoc, request *reqb, int *fd);
 329 static void process_close(association *assoc, request *reqb);
 330 void save_referenceId (request *reqb, Z_ReferenceId *refid);
 331 static Z_APDU *process_deleteRequest(association *assoc, request *reqb,
 332     int *fd);
 333
 334 static FILE *apduf = 0; /* for use in static mode */
 335 static statserv_options_block *control_block = 0;
 336
 337 /* Chas: Added in from DALI */
 338 static Z_APDU *process_ESRequest(association *assoc, request *reqb, int *fd);
 339 /* Chas: End of addition from DALI */
 340
 341 /*
 342  * Create and initialize a new association-handle.
 343  *  channel  : iochannel for the current line.
 344  *  link     : communications channel.
 345  * Returns: 0 or a new association handle.
 346  */
 347 association *create_association(IOCHAN channel, COMSTACK link)
 348 {
 349     association *anew;
 350
 351     if (!control_block)
 352         control_block = statserv_getcontrol();
 353     if (!(anew = (association *)xmalloc(sizeof(*anew))))
 354         return 0;
 355     anew->client_chan = channel;
 356     anew->client_link = link;
 357     if (!(anew->decode = odr_createmem(ODR_DECODE)) ||
 358         !(anew->encode = odr_createmem(ODR_ENCODE)))
 359         return 0;
 360     if (*control_block->apdufile)
 361     {
 362         char filename[256];
 363         FILE *f;
 364
 365         strcpy(filename, control_block->apdufile);
 366         if (!(anew->print = odr_createmem(ODR_PRINT)))
 367             return 0;
 368         if (*control_block->apdufile != '-')
 369         {
 370             strcpy(filename, control_block->apdufile);
 371             if (!control_block->dynamic)
 372             {
 373                 if (!apduf)
 374                 {
 375                     if (!(apduf = fopen(filename, "w")))
 376                     {
 377                         logf(LOG_WARN|LOG_ERRNO, "%s", filename);
 378                         return 0;
 379                     }
 380                     setvbuf(apduf, 0, _IONBF, 0);
 381                 }
 382                 f = apduf;
 383             }
 384             else
 385             {
 386                 sprintf(filename + strlen(filename), ".%d", getpid());
 387                 if (!(f = fopen(filename, "w")))
 388                 {
 389                     logf(LOG_WARN|LOG_ERRNO, "%s", filename);
 390                     return 0;
 391                 }
 392                 setvbuf(f, 0, _IONBF, 0);
 393             }
 394             odr_setprint(anew->print, f);
 395         }
 396     }
 397     else
 398         anew->print = 0;
 399     anew->input_buffer = 0;
 400     anew->input_buffer_len = 0;
 401     anew->backend = 0;
 402     anew->state = ASSOC_NEW;
 403     request_initq(&anew->incoming);
 404     request_initq(&anew->outgoing);
 405     anew->proto = cs_getproto(link);
 406     return anew;
 407 }
 408
 409 /*
 410  * Free association and release resources.
 411  */
 412 void destroy_association(association *h)
 413 {
 414     odr_destroy(h->decode);
 415     odr_destroy(h->encode);
 416     if (h->print)
 417         odr_destroy(h->print);
 418     if (h->input_buffer)
 419     xfree(h->input_buffer);
 420     if (h->backend)
 421         bend_close(h->backend);
 422     while (request_deq(&h->incoming));
 423     while (request_deq(&h->outgoing));
 424     request_delq(&h->incoming);
 425     request_delq(&h->outgoing);
 426     xfree(h);
 427 }
 428
 429 static void do_close_req(association *a, int reason, char *message,
 430                          request *req)
 431 {
 432     Z_APDU apdu;
 433     Z_Close *cls = zget_Close(a->encode);
 434
 435     /* Purge request queue */
 436     while (request_deq(&a->incoming));
 437     while (request_deq(&a->outgoing));
 438     if (a->version >= 3)
 439     {
 440         logf(LOG_LOG, "Sending Close PDU, reason=%d, message=%s",
 441             reason, message ? message : "none");
 442         apdu.which = Z_APDU_close;
 443         apdu.u.close = cls;
 444         *cls->closeReason = reason;
 445         cls->diagnosticInformation = message;
 446         process_response(a, req, &apdu);
 447         iochan_settimeout(a->client_chan, 60);
 448     }
 449     else
 450     {
 451         logf(LOG_DEBUG, "v2 client. No Close PDU");
 452         iochan_setevent(a->client_chan, EVENT_TIMEOUT); /* force imm close */
 453     }
 454     a->state = ASSOC_DEAD;
 455 }
 456
 457 static void do_close(association *a, int reason, char *message)
 458 {
 459     do_close_req (a, reason, message, request_get(&a->outgoing));
 460 }
 461
 462 /*
 463  * This is where PDUs from the client are read and the further
 464  * processing is initiated. Flow of control moves down through the
 465  * various process_* functions below, until the encoded result comes back up
 466  * to the output handler in here.
 467  *
 468  *  h     : the I/O channel that has an outstanding event.
 469  *  event : the current outstanding event.
 470  */
 471 void ir_session(IOCHAN h, int event)
 472 {
 473     int res;
 474     association *assoc = (association *)iochan_getdata(h);
 475     COMSTACK conn = assoc->client_link;
 476     request *req;
 477
 478     assert(h && conn && assoc);
 479     if (event == EVENT_TIMEOUT)
 480     {
 481         if (assoc->state != ASSOC_UP)
 482         {
 483             logf(LOG_LOG, "Final timeout - closing connection.");
 484             cs_close(conn);
 485             destroy_association(assoc);
 486             iochan_destroy(h);
 487         }
 488         else
 489         {
 490             logf(LOG_LOG, "Session idle too long. Sending close.");
 491             do_close(assoc, Z_Close_lackOfActivity, 0);
 492         }
 493         return;
 494     }
 495     if (event & EVENT_INPUT || event & EVENT_WORK) /* input */
 496     {
 497         if (event & EVENT_INPUT)
 498         {
 499             logf(LOG_DEBUG, "ir_session (input)");
 500             assert(assoc && conn);
 501             /* We aren't speaking to this fellow */
 502             if (assoc->state == ASSOC_DEAD)
 503             {
 504                 logf(LOG_LOG, "Closed connection after reject");
 505                 cs_close(conn);
 506                 destroy_association(assoc);
 507                 iochan_destroy(h);
 508                 return;
 509             }
 510             if ((res = cs_get(conn, &assoc->input_buffer,
 511                 &assoc->input_buffer_len)) <= 0)
 512             {
 513                 logf(LOG_LOG, "Connection closed by client");
 514                 cs_close(conn);
 515                 destroy_association(assoc);
 516                 iochan_destroy(h);
 517                 return;
 518             }
 519             else if (res == 1) /* incomplete read - wait for more  */
 520                 return;
 521             if (cs_more(conn)) /* more stuff - call us again later, please */
 522                 iochan_setevent(h, EVENT_INPUT);
 523
 524             /* we got a complete PDU. Let's decode it */
 525             logf(LOG_DEBUG, "Got PDU, %d bytes", res);
 526             req = request_get(&assoc->incoming); /* get a new request structure */
 527             odr_reset(assoc->decode);
 528             odr_setbuf(assoc->decode, assoc->input_buffer, res, 0);
 529             if (!z_APDU(assoc->decode, &req->request, 0))
 530             {
 531                 logf(LOG_LOG, "ODR error on incoming PDU: %s [near byte %d] ",
 532                     odr_errmsg(odr_geterror(assoc->decode)),
 533                     odr_offset(assoc->decode));
 534                 logf(LOG_LOG, "PDU dump:");
 535                 odr_dumpBER(log_file(), assoc->input_buffer, res);
 536                 do_close(assoc, Z_Close_protocolError, "Malformed package");
 537                 return;
 538             }
 539             req->request_mem = odr_extract_mem(assoc->decode);
 540             if (assoc->print && !z_APDU(assoc->print, &req->request, 0))
 541             {
 542                 logf(LOG_WARN, "ODR print error: %s",
 543                     odr_errmsg(odr_geterror(assoc->print)));
 544                 odr_reset(assoc->print);
 545             }
 546             request_enq(&assoc->incoming, req);
 547         }
 548
 549         /* can we do something yet? */
 550         req = request_head(&assoc->incoming);
 551         if (req->state == REQUEST_IDLE)
 552         {
 553             request_deq(&assoc->incoming);
 554             if (process_request(assoc, req) < 0)
 555                 do_close_req(assoc, Z_Close_systemProblem, "Unknown error",
 556                              req);
 557         }
 558     }
 559     if (event & EVENT_OUTPUT)
 560     {
 561         request *req = request_head(&assoc->outgoing);
 562
 563         logf(LOG_DEBUG, "ir_session (output)");
 564         req->state = REQUEST_PENDING;
 565         switch (res = cs_put(conn, req->response, req->len_response))
 566         {
 567             case -1:
 568                 logf(LOG_LOG, "Connection closed by client");
 569                 cs_close(conn);
 570                 destroy_association(assoc);
 571                 iochan_destroy(h);
 572                 break;
 573             case 0: /* all sent - release the request structure */
 574                 logf(LOG_DEBUG, "Wrote PDU, %d bytes", req->len_response);
 575                 nmem_destroy(req->request_mem);
 576                 request_deq(&assoc->outgoing);
 577                 request_release(req);
 578                 if (!request_head(&assoc->outgoing))
 579                     iochan_clearflag(h, EVENT_OUTPUT);
 580                 break;
 581             /* value of 1 -- partial send -- is simply ignored */
 582         }
 583     }
 584     if (event & EVENT_EXCEPT)
 585     {
 586         logf(LOG_DEBUG, "ir_session (exception)");
 587         cs_close(conn);
 588         destroy_association(assoc);
 589         iochan_destroy(h);
 590     }
 591 }
 592
 593 /*
 594  * Initiate request processing.
 595  */
 596 static int process_request(association *assoc, request *req)
 597 {
 598     int fd = -1;
 599     Z_APDU *res;
 600     int retval;
 601
 602     assert(req && req->state == REQUEST_IDLE);
 603     switch (req->request->which)
 604     {
 605         case Z_APDU_initRequest:
 606             res = process_initRequest(assoc, req); break;
 607         case Z_APDU_searchRequest:
 608             res = process_searchRequest(assoc, req, &fd); break;
 609         case Z_APDU_presentRequest:
 610             res = process_presentRequest(assoc, req, &fd); break;
 611         case Z_APDU_scanRequest:
 612             res = process_scanRequest(assoc, req, &fd); break;
 613         case Z_APDU_extendedServicesRequest:
 614             if (assoc->bend_esrequest)
 615                 res = process_ESRequest(assoc, req, &fd);
 616             else
 617             {
 618                 logf(LOG_WARN, "Cannot handle EXTENDED SERVICES APDU");
 619                 return -1;
 620             }
 621             break;
 622         case Z_APDU_sortRequest:
 623             if (assoc->bend_sort)
 624                 res = process_sortRequest(assoc, req, &fd);
 625             else
 626             {
 627                 logf(LOG_WARN, "Cannot handle SORT APDU");
 628                 return -1;
 629             }
 630             break;
 631         case Z_APDU_close:
 632             process_close(assoc, req); return 0;
 633         case Z_APDU_deleteResultSetRequest:
 634             if (assoc->bend_delete)
 635                 res = process_deleteRequest(assoc, req, &fd);
 636             else
 637             {
 638                 logf (LOG_WARN, "Cannot handle Delete APDU");
 639                 return -1;
 640             }
 641             break;
 642         default:
 643             logf(LOG_WARN, "Bad APDU received");
 644             return -1;
 645     }
 646     if (res)
 647     {
 648         logf(LOG_DEBUG, "  result immediately available");
 649         retval = process_response(assoc, req, res);
 650     }
 651     else if (fd < 0)
 652     {
 653         logf(LOG_DEBUG, "  result unavailble");
 654         retval = 0;
 655     }
 656     else /* no result yet - one will be provided later */
 657     {
 658         IOCHAN chan;
 659
 660         /* Set up an I/O handler for the fd supplied by the backend */
 661
 662         logf(LOG_DEBUG, "   establishing handler for result");
 663         req->state = REQUEST_PENDING;
 664         if (!(chan = iochan_create(fd, backend_response, EVENT_INPUT)))
 665             abort();
 666         iochan_setdata(chan, assoc);
 667         retval = 0;
 668     }
 669     return retval;
 670 }
 671
 672 /*
 673  * Handle message from the backend.
 674  */
 675 void backend_response(IOCHAN i, int event)
 676 {
 677     association *assoc = (association *)iochan_getdata(i);
 678     request *req = request_head(&assoc->incoming);
 679     Z_APDU *res;
 680     int fd;
 681
 682     logf(LOG_DEBUG, "backend_response");
 683     assert(assoc && req && req->state != REQUEST_IDLE);
 684     /* determine what it is we're waiting for */
 685     switch (req->request->which)
 686     {
 687         case Z_APDU_searchRequest:
 688             res = response_searchRequest(assoc, req, 0, &fd); break;
 689 #if 0
 690         case Z_APDU_presentRequest:
 691             res = response_presentRequest(assoc, req, 0, &fd); break;
 692         case Z_APDU_scanRequest:
 693             res = response_scanRequest(assoc, req, 0, &fd); break;
 694 #endif
 695         default:
 696             logf(LOG_WARN, "Serious programmer's lapse or bug");
 697             abort();
 698     }
 699     if ((res && process_response(assoc, req, res) < 0) || fd < 0)
 700     {
 701         logf(LOG_LOG, "Fatal error when talking to backend");
 702         do_close(assoc, Z_Close_systemProblem, 0);
 703         iochan_destroy(i);
 704         return;
 705     }
 706     else if (!res) /* no result yet - try again later */
 707     {
 708         logf(LOG_DEBUG, "   no result yet");
 709         iochan_setfd(i, fd); /* in case fd has changed */
 710     }
 711 }
 712
 713 /*
 714  * Encode response, and transfer the request structure to the outgoing queue.
 715  */
 716 static int process_response(association *assoc, request *req, Z_APDU *res)
 717 {
 718     odr_setbuf(assoc->encode, req->response, req->size_response, 1);
 719     if (!z_APDU(assoc->encode, &res, 0))
 720     {
 721         logf(LOG_WARN, "ODR error when encoding response: %s",
 722             odr_errmsg(odr_geterror(assoc->decode)));
 723         odr_reset(assoc->encode);
 724         return -1;
 725     }
 726     req->response = odr_getbuf(assoc->encode, &req->len_response,
 727         &req->size_response);
 728     odr_setbuf(assoc->encode, 0, 0, 0); /* don'txfree if we abort later */
 729     if (assoc->print && !z_APDU(assoc->print, &res, 0))
 730     {
 731         logf(LOG_WARN, "ODR print error: %s",
 732             odr_errmsg(odr_geterror(assoc->print)));
 733         odr_reset(assoc->print);
 734     }
 735     odr_reset(assoc->encode);
 736     req->state = REQUEST_IDLE;
 737     request_enq(&assoc->outgoing, req);
 738     /* turn the work over to the ir_session handler */
 739     iochan_setflag(assoc->client_chan, EVENT_OUTPUT);
 740     /* Is there more work to be done? give that to the input handler too */
 741 #if 1
 742     if (request_head(&assoc->incoming))
 743     {
 744         logf (LOG_DEBUG, "more work to be done");
 745         iochan_setevent(assoc->client_chan, EVENT_WORK);
 746     }
 747 #endif
 748     return 0;
 749 }
 750
 751 /*
 752  * Handle init request.
 753  * At the moment, we don't check the options
 754  * anywhere else in the code - we just try not to do anything that would
 755  * break a naive client. We'll toss 'em into the association block when
 756  * we need them there.
 757  */
 758 static Z_APDU *process_initRequest(association *assoc, request *reqb)
 759 {
 760     Z_InitRequest *req = reqb->request->u.initRequest;
 761     Z_APDU *apdu = zget_APDU(assoc->encode, Z_APDU_initResponse);
 762     Z_InitResponse *resp = apdu->u.initResponse;
 763     bend_initrequest binitreq;
 764     bend_initresult *binitres;
 765     char options[100];
 766
 767     logf(LOG_LOG, "Got initRequest");
 768     if (req->implementationId)
 769         logf(LOG_LOG, "Id:        %s", req->implementationId);
 770     if (req->implementationName)
 771         logf(LOG_LOG, "Name:      %s", req->implementationName);
 772     if (req->implementationVersion)
 773         logf(LOG_LOG, "Version:   %s", req->implementationVersion);
 774
 775     binitreq.stream = assoc->encode;
 776     binitreq.configname = "default-config";
 777     binitreq.auth = req->idAuthentication;
 778     binitreq.bend_sort = NULL;
 779     binitreq.bend_search = NULL;
 780     binitreq.bend_present = NULL;
 781     binitreq.bend_esrequest = NULL;
 782     binitreq.bend_delete = NULL;
 783     if (!(binitres = bend_init(&binitreq)))
 784     {
 785         logf(LOG_WARN, "Bad response from backend.");
 786         return 0;
 787     }
 788
 789     assoc->backend = binitres->handle;
 790     if ((assoc->bend_sort = (int (*)())binitreq.bend_sort))
 791         logf (LOG_DEBUG, "Sort handler installed");
 792     if ((assoc->bend_search = (int (*)())binitreq.bend_search))
 793         logf (LOG_DEBUG, "Search handler installed");
 794     if ((assoc->bend_present = (int (*)())binitreq.bend_present))
 795         logf (LOG_DEBUG, "Present handler installed");
 796     if ((assoc->bend_esrequest = (int (*)())binitreq.bend_esrequest))
 797         logf (LOG_DEBUG, "ESRequest handler installed");
 798     if ((assoc->bend_delete = (int (*)())binitreq.bend_delete))
 799         logf (LOG_DEBUG, "Delete handler installed");
 800
 801     resp->referenceId = req->referenceId;
 802     *options = '\0';
 803     /* let's tell the client what we can do */
 804     if (ODR_MASK_GET(req->options, Z_Options_search))
 805     {
 806         ODR_MASK_SET(resp->options, Z_Options_search);
 807         strcat(options, "srch");
 808     }
 809     if (ODR_MASK_GET(req->options, Z_Options_present))
 810     {
 811         ODR_MASK_SET(resp->options, Z_Options_present);
 812         strcat(options, " prst");
 813     }
 814     if (ODR_MASK_GET(req->options, Z_Options_delSet) && binitreq.bend_delete)
 815     {
 816         ODR_MASK_SET(resp->options, Z_Options_delSet);
 817         strcat(options, " del");
 818     }
 819     if (ODR_MASK_GET(req->options, Z_Options_extendedServices) &&
 820         binitreq.bend_esrequest)
 821     {
 822         ODR_MASK_SET(resp->options, Z_Options_extendedServices);
 823         strcat (options, " extendedServices");
 824     }
 825     if (ODR_MASK_GET(req->options, Z_Options_namedResultSets))
 826     {
 827         ODR_MASK_SET(resp->options, Z_Options_namedResultSets);
 828         strcat(options, " namedresults");
 829     }
 830     if (ODR_MASK_GET(req->options, Z_Options_scan))
 831     {
 832         ODR_MASK_SET(resp->options, Z_Options_scan);
 833         strcat(options, " scan");
 834     }
 835     if (ODR_MASK_GET(req->options, Z_Options_concurrentOperations))
 836     {
 837         ODR_MASK_SET(resp->options, Z_Options_concurrentOperations);
 838         strcat(options, " concurop");
 839     }
 840     if (ODR_MASK_GET(req->options, Z_Options_sort) && binitreq.bend_sort)
 841     {
 842         ODR_MASK_SET(resp->options, Z_Options_sort);
 843         strcat(options, " sort");
 844     }
 845     if (ODR_MASK_GET(req->protocolVersion, Z_ProtocolVersion_1))
 846     {
 847         ODR_MASK_SET(resp->protocolVersion, Z_ProtocolVersion_1);
 848         assoc->version = 2; /* 1 & 2 are equivalent */
 849     }
 850     if (ODR_MASK_GET(req->protocolVersion, Z_ProtocolVersion_2))
 851     {
 852         ODR_MASK_SET(resp->protocolVersion, Z_ProtocolVersion_2);
 853         assoc->version = 2;
 854     }
 855     if (ODR_MASK_GET(req->protocolVersion, Z_ProtocolVersion_3))
 856     {
 857         ODR_MASK_SET(resp->protocolVersion, Z_ProtocolVersion_3);
 858         assoc->version = 3;
 859     }
 860     logf(LOG_LOG, "Negotiated to v%d: %s", assoc->version, options);
 861     assoc->maximumRecordSize = *req->maximumRecordSize;
 862     if (assoc->maximumRecordSize > control_block->maxrecordsize)
 863         assoc->maximumRecordSize = control_block->maxrecordsize;
 864     assoc->preferredMessageSize = *req->preferredMessageSize;
 865     if (assoc->preferredMessageSize > assoc->maximumRecordSize)
 866         assoc->preferredMessageSize = assoc->maximumRecordSize;
 867     resp->preferredMessageSize = &assoc->preferredMessageSize;
 868     resp->maximumRecordSize = &assoc->maximumRecordSize;
 869     resp->implementationName = "Index Data/YAZ Generic Frontend Server";
 870     if (binitres->errcode)
 871     {
 872         logf(LOG_LOG, "Connection rejected by backend.");
 873         *resp->result = 0;
 874         assoc->state = ASSOC_DEAD;
 875     }
 876     else
 877         assoc->state = ASSOC_UP;
 878     return apdu;
 879 }
 880
 881 /*
 882  * These functions should be merged.
 883  */
 884
 885 static void set_addinfo (Z_DefaultDiagFormat *dr, char *addinfo)
 886 {
 887 #if ASN_COMPILED
 888     dr->which = Z_DefaultDiagFormat_v2Addinfo;
 889     dr->u.v2Addinfo = addinfo ? addinfo : "";
 890 #else
 891     dr->which = Z_DiagForm_v2AddInfo;
 892     dr->addinfo = addinfo ? addinfo : "";
 893 #endif
 894 }
 895
 896 /*
 897  * nonsurrogate diagnostic record.
 898  */
 899 static Z_Records *diagrec(association *assoc, int error, char *addinfo)
 900 {
 901     int oid[OID_SIZE];
 902     Z_Records *rec = (Z_Records *)
 903         odr_malloc (assoc->encode, sizeof(*rec));
 904     oident bib1;
 905     int *err = (int *)
 906         odr_malloc (assoc->encode, sizeof(*err));
 907     Z_DiagRec *drec = (Z_DiagRec *)
 908         odr_malloc (assoc->encode, sizeof(*drec));
 909     Z_DefaultDiagFormat *dr = (Z_DefaultDiagFormat *)
 910         odr_malloc (assoc->encode, sizeof(*dr));
 911
 912     bib1.proto = assoc->proto;
 913     bib1.oclass = CLASS_DIAGSET;
 914     bib1.value = VAL_BIB1;
 915
 916     logf(LOG_DEBUG, "Diagnostic: %d -- %s", error, addinfo ? addinfo :
 917         "NULL");
 918     *err = error;
 919     rec->which = Z_Records_NSD;
 920 #if ASN_COMPILED
 921     rec->u.nonSurrogateDiagnostic = dr;
 922 #else
 923 #ifdef Z_95
 924     rec->u.nonSurrogateDiagnostic = drec;
 925     drec->which = Z_DiagRec_defaultFormat;
 926     drec->u.defaultFormat = dr;
 927 #else
 928     rec->u.nonSurrogateDiagnostic = dr;
 929 #endif
 930 #endif
 931     dr->diagnosticSetId = odr_oiddup (assoc->encode,
 932                                       oid_ent_to_oid(&bib1, oid));
 933     dr->condition = err;
 934     set_addinfo (dr, addinfo);
 935     return rec;
 936 }
 937
 938 /*
 939  * surrogate diagnostic.
 940  */
 941 static Z_NamePlusRecord *surrogatediagrec(association *assoc, char *dbname,
 942                                           int error, char *addinfo)
 943 {
 944     int oid[OID_SIZE];
 945     Z_NamePlusRecord *rec = (Z_NamePlusRecord *)odr_malloc (assoc->encode, sizeof(*rec));
 946     int *err = (int *)odr_malloc (assoc->encode, sizeof(*err));
 947     oident bib1;
 948     Z_DiagRec *drec = (Z_DiagRec *)odr_malloc (assoc->encode, sizeof(*drec));
 949     Z_DefaultDiagFormat *dr = (Z_DefaultDiagFormat *)odr_malloc (assoc->encode, sizeof(*dr));
 950
 951     bib1.proto = assoc->proto;
 952     bib1.oclass = CLASS_DIAGSET;
 953     bib1.value = VAL_BIB1;
 954
 955     logf(LOG_DEBUG, "SurrogateDiagnotic: %d -- %s", error, addinfo);
 956     *err = error;
 957     rec->databaseName = dbname;
 958     rec->which = Z_NamePlusRecord_surrogateDiagnostic;
 959     rec->u.surrogateDiagnostic = drec;
 960     drec->which = Z_DiagRec_defaultFormat;
 961     drec->u.defaultFormat = dr;
 962     dr->diagnosticSetId = odr_oiddup (assoc->encode,
 963                                       oid_ent_to_oid(&bib1, oid));
 964     dr->condition = err;
 965     set_addinfo (dr, addinfo);
 966
 967     return rec;
 968 }
 969
 970 /*
 971  * multiple nonsurrogate diagnostics.
 972  */
 973 static Z_DiagRecs *diagrecs(association *assoc, int error, char *addinfo)
 974 {
 975     int oid[OID_SIZE];
 976     Z_DiagRecs *recs = (Z_DiagRecs *)odr_malloc (assoc->encode, sizeof(*recs));
 977     int *err = (int *)odr_malloc (assoc->encode, sizeof(*err));
 978     oident bib1;
 979     Z_DiagRec **recp = (Z_DiagRec **)odr_malloc (assoc->encode, sizeof(*recp));
 980     Z_DiagRec *drec = (Z_DiagRec *)odr_malloc (assoc->encode, sizeof(*drec));
 981     Z_DefaultDiagFormat *rec = (Z_DefaultDiagFormat *)odr_malloc (assoc->encode, sizeof(*rec));
 982
 983     logf(LOG_DEBUG, "DiagRecs: %d -- %s", error, addinfo ? addinfo : "");
 984     bib1.proto = assoc->proto;
 985     bib1.oclass = CLASS_DIAGSET;
 986     bib1.value = VAL_BIB1;
 987
 988     *err = error;
 989     recs->num_diagRecs = 1;
 990     recs->diagRecs = recp;
 991     recp[0] = drec;
 992     drec->which = Z_DiagRec_defaultFormat;
 993     drec->u.defaultFormat = rec;
 994
 995     rec->diagnosticSetId = odr_oiddup (assoc->encode,
 996                                       oid_ent_to_oid(&bib1, oid));
 997     rec->condition = err;
 998
 999 #ifdef ASN_COMPILED
1000     rec->which = Z_DefaultDiagFormat_v2Addinfo;
1001     rec->u.v2Addinfo = addinfo ? addinfo : "";
1002 #else
1003     rec->which = Z_DiagForm_v2AddInfo;
1004     rec->addinfo = addinfo ? addinfo : "";
1005 #endif
1006     return recs;
1007 }
1008
1009 static Z_Records *pack_records(association *a, char *setname, int start,
1010                                 int *num, Z_RecordComposition *comp,
1011                                 int *next, int *pres, oid_value format)
1012 {
1013     int oid[OID_SIZE];
1014     int recno, total_length = 0, toget = *num, dumped_records = 0;
1015     Z_Records *records =
1016         (Z_Records *) odr_malloc (a->encode, sizeof(*records));
1017     Z_NamePlusRecordList *reclist =
1018         (Z_NamePlusRecordList *) odr_malloc (a->encode, sizeof(*reclist));
1019     Z_NamePlusRecord **list =
1020         (Z_NamePlusRecord **) odr_malloc (a->encode, sizeof(*list) * toget);
1021     oident recform;
1022
1023     records->which = Z_Records_DBOSD;
1024     records->u.databaseOrSurDiagnostics = reclist;
1025     reclist->num_records = 0;
1026     reclist->records = list;
1027     *pres = Z_PRES_SUCCESS;
1028     *num = 0;
1029     *next = 0;
1030
1031     logf(LOG_LOG, "Request to pack %d+%d", start, toget);
1032     logf(LOG_DEBUG, "pms=%d, mrs=%d", a->preferredMessageSize,
1033         a->maximumRecordSize);
1034     for (recno = start; reclist->num_records < toget; recno++)
1035     {
1036         bend_fetchrequest freq;
1037         bend_fetchresult *fres;
1038         Z_NamePlusRecord *thisrec;
1039         Z_DatabaseRecord *thisext;
1040         int this_length = 0;
1041
1042         /*
1043          * we get the number of bytes allocated on the stream before any
1044          * allocation done by the backend - this should give us a reasonable
1045          * idea of the total size of the data so far.
1046          */
1047         total_length = odr_total(a->encode) - dumped_records;
1048         freq.setname = setname;
1049         freq.number = recno;
1050         freq.comp = comp;
1051         freq.format = format;
1052         freq.stream = a->encode;
1053         freq.surrogate_flag = 0;
1054         if (!(fres = bend_fetch(a->backend, &freq, 0)))
1055         {
1056             *pres = Z_PRES_FAILURE;
1057             return diagrec(a, 2, "Backend interface problem");
1058         }
1059         /* backend should be able to signal whether error is system-wide
1060            or only pertaining to current record */
1061         if (fres->errcode)
1062         {
1063             if (!freq.surrogate_flag)
1064             {
1065                 *pres = Z_PRES_FAILURE;
1066                 return diagrec(a, fres->errcode, fres->errstring);
1067             }
1068             reclist->records[reclist->num_records] =
1069                 surrogatediagrec(a, fres->basename, fres->errcode,
1070                                  fres->errstring);
1071             reclist->num_records++;
1072             *next = fres->last_in_set ? 0 : recno + 1;
1073             continue;
1074         }
1075         if (fres->len >= 0)
1076             this_length = fres->len;
1077         else
1078             this_length = odr_total(a->encode) - total_length;
1079         logf(LOG_DEBUG, "  fetched record, len=%d, total=%d",
1080             this_length, total_length);
1081         if (this_length + total_length > a->preferredMessageSize)
1082         {
1083             /* record is small enough, really */
1084             if (this_length <= a->preferredMessageSize)
1085             {
1086                 logf(LOG_DEBUG, "  Dropped last normal-sized record");
1087                 *pres = Z_PRES_PARTIAL_2;
1088                 break;
1089             }
1090             /* record can only be fetched by itself */
1091             if (this_length < a->maximumRecordSize)
1092             {
1093                 logf(LOG_DEBUG, "  Record > prefmsgsz");
1094                 if (toget > 1)
1095                 {
1096                     logf(LOG_DEBUG, "  Dropped it");
1097                     reclist->records[reclist->num_records] =
1098                          surrogatediagrec(a, fres->basename, 16, 0);
1099                     reclist->num_records++;
1100                     *next = fres->last_in_set ? 0 : recno + 1;
1101                     dumped_records += this_length;
1102                     continue;
1103                 }
1104             }
1105             else /* too big entirely */
1106             {
1107                 logf(LOG_DEBUG, "Record > maxrcdsz");
1108                 reclist->records[reclist->num_records] =
1109                     surrogatediagrec(a, fres->basename, 17, 0);
1110                 reclist->num_records++;
1111                 *next = fres->last_in_set ? 0 : recno + 1;
1112                 dumped_records += this_length;
1113                 continue;
1114             }
1115         }
1116
1117         if (!(thisrec = (Z_NamePlusRecord *)odr_malloc(a->encode, sizeof(*thisrec))))
1118             return 0;
1119         if (!(thisrec->databaseName = (char *)odr_malloc(a->encode,
1120             strlen(fres->basename) + 1)))
1121             return 0;
1122         strcpy(thisrec->databaseName, fres->basename);
1123         thisrec->which = Z_NamePlusRecord_databaseRecord;
1124         if (!(thisrec->u.databaseRecord = thisext = (Z_External *)odr_malloc(a->encode,
1125             sizeof(Z_DatabaseRecord))))
1126             return 0;
1127         recform.proto = a->proto;
1128         recform.oclass = CLASS_RECSYN;
1129         recform.value = fres->format;
1130         thisext->direct_reference = odr_oiddup(a->encode,
1131                                                oid_ent_to_oid(&recform, oid));
1132         thisext->indirect_reference = 0;
1133         thisext->descriptor = 0;
1134         if (fres->len < 0) /* Structured data */
1135         {
1136             switch (fres->format)
1137             {
1138                 case VAL_SUTRS: thisext->which = Z_External_sutrs; break;
1139                 case VAL_GRS1: thisext->which = Z_External_grs1; break;
1140                 case VAL_EXPLAIN: thisext->which = Z_External_explainRecord;
1141                     break;
1142                 case VAL_SUMMARY: thisext->which = Z_External_summary; break;
1143                 case VAL_OPAC: thisext->which = Z_External_OPAC; break;
1144
1145                 default:
1146                     logf(LOG_FATAL, "Unknown structured format from backend.");
1147                     return 0;
1148             }
1149
1150             /*
1151              * We cheat on the pointers here. Obviously, the record field
1152              * of the backend-fetch structure should have been a union for
1153              * correctness, but we're stuck with this for backwards
1154              * compatibility.
1155              */
1156             thisext->u.grs1 = (Z_GenericRecord*) fres->record;
1157         }
1158         else if (fres->format == VAL_SUTRS) /* SUTRS is a single-ASN.1-type */
1159         {
1160 #if 0
1161             Z_SUTRS *sutrs = (Z_SUTRS *)odr_malloc(a->encode, 1+fres->len);
1162
1163             memcpy(sutrs, fres->record, fres->len);
1164             sutrs[fres->len] = '\0';
1165 #else
1166             Odr_oct *sutrs = (Odr_oct *)odr_malloc(a->encode, sizeof(*sutrs));
1167
1168             thisext->which = Z_External_sutrs;
1169             thisext->u.sutrs = sutrs;
1170             sutrs->buf = (unsigned char *)odr_malloc(a->encode, fres->len);
1171             sutrs->len = sutrs->size = fres->len;
1172             memcpy(sutrs->buf, fres->record, fres->len);
1173 #endif
1174         }
1175         else /* octet-aligned record. */
1176         {
1177             thisext->which = Z_External_octet;
1178             if (!(thisext->u.octet_aligned = (Odr_oct *)odr_malloc(a->encode,
1179                 sizeof(Odr_oct))))
1180                 return 0;
1181             if (!(thisext->u.octet_aligned->buf = (unsigned char *)odr_malloc(a->encode,
1182                 fres->len)))
1183                 return 0;
1184             memcpy(thisext->u.octet_aligned->buf, fres->record, fres->len);
1185             thisext->u.octet_aligned->len = thisext->u.octet_aligned->size =
1186                 fres->len;
1187         }
1188         reclist->records[reclist->num_records] = thisrec;
1189         reclist->num_records++;
1190         *next = fres->last_in_set ? 0 : recno + 1;
1191     }
1192     *num = reclist->num_records;
1193     return records;
1194 }
1195
1196 static Z_APDU *process_searchRequest(association *assoc, request *reqb,
1197     int *fd)
1198 {
1199     Z_SearchRequest *req = reqb->request->u.searchRequest;
1200     bend_search_rr *bsrr =
1201         (bend_search_rr *)nmem_malloc (reqb->request_mem, sizeof(*bsrr));
1202
1203     logf(LOG_LOG, "Got SearchRequest.");
1204     save_referenceId (reqb, req->referenceId);
1205     /* store ref id in request */
1206     bsrr->fd = fd;
1207     bsrr->request = reqb;
1208     bsrr->association = assoc;
1209
1210     logf (LOG_LOG, "ResultSet '%s'", req->resultSetName);
1211     if (req->databaseNames)
1212     {
1213         int i;
1214         for (i = 0; i < req->num_databaseNames; i++)
1215             logf (LOG_LOG, "Database '%s'", req->databaseNames[i]);
1216     }
1217     switch (req->query->which)
1218     {
1219     case Z_Query_type_1: case Z_Query_type_101:
1220         log_rpn_query (req->query->u.type_1);
1221     }
1222     if (assoc->bend_search)
1223     {
1224         bsrr->setname = req->resultSetName;
1225         bsrr->replace_set = *req->replaceIndicator;
1226         bsrr->num_bases = req->num_databaseNames;
1227         bsrr->basenames = req->databaseNames;
1228         bsrr->query = req->query;
1229         bsrr->stream = assoc->encode;
1230         bsrr->decode = assoc->decode;
1231         bsrr->errcode = 0;
1232         bsrr->hits = 0;
1233         bsrr->errstring = NULL;
1234         ((int (*)(void *, bend_search_rr *))(assoc->bend_search))
1235             (assoc->backend, bsrr);
1236         if (!bsrr->request)
1237             return 0;
1238     }
1239     else
1240     {
1241         bend_searchrequest bsrq;
1242         bend_searchresult *bsrt;
1243
1244         bsrq.setname = req->resultSetName;
1245         bsrq.replace_set = *req->replaceIndicator;
1246         bsrq.num_bases = req->num_databaseNames;
1247         bsrq.basenames = req->databaseNames;
1248         bsrq.query = req->query;
1249         bsrq.stream = assoc->encode;
1250         bsrq.decode = assoc->decode;
1251         if (!(bsrt = bend_search(assoc->backend, &bsrq, fd)))
1252             return 0;
1253         bsrr->hits = bsrt->hits;
1254         bsrr->errcode = bsrt->errcode;
1255         bsrr->errstring = bsrt->errstring;
1256     }
1257     return response_searchRequest(assoc, reqb, bsrr, fd);
1258 }
1259
1260 int bend_searchresponse(void *handle, bend_search_rr *bsrr) {return 0;}
1261
1262 /*
1263  * Prepare a searchresponse based on the backend results. We probably want
1264  * to look at making the fetching of records nonblocking as well, but
1265  * so far, we'll keep things simple.
1266  * If bsrt is null, that means we're called in response to a communications
1267  * event, and we'll have to get the response for ourselves.
1268  */
1269 static Z_APDU *response_searchRequest(association *assoc, request *reqb,
1270     bend_search_rr *bsrt, int *fd)
1271 {
1272     Z_SearchRequest *req = reqb->request->u.searchRequest;
1273     Z_APDU *apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1274     Z_SearchResponse *resp = (Z_SearchResponse *)odr_malloc (assoc->encode, sizeof(*resp));
1275     int *nulint = (int *)odr_malloc (assoc->encode, sizeof(*nulint));
1276     bool_t *sr = (bool_t *)odr_malloc (assoc->encode, sizeof(*sr));
1277     int *next = (int *)odr_malloc (assoc->encode, sizeof(*next));
1278     int *none = (int *)odr_malloc (assoc->encode, sizeof(*none));
1279
1280     *nulint = 0;
1281     *sr = 1;
1282     *next = 0;
1283     *none = Z_RES_NONE;
1284
1285     apdu->which = Z_APDU_searchResponse;
1286     apdu->u.searchResponse = resp;
1287     resp->referenceId = req->referenceId;
1288     resp->additionalSearchInfo = 0;
1289     resp->otherInfo = 0;
1290     *fd = -1;
1291     if (!bsrt && !bend_searchresponse(assoc->backend, bsrt))
1292     {
1293         logf(LOG_FATAL, "Bad result from backend");
1294         return 0;
1295     }
1296     else if (bsrt->errcode)
1297     {
1298         resp->records = diagrec(assoc, bsrt->errcode, bsrt->errstring);
1299         resp->resultCount = nulint;
1300         resp->numberOfRecordsReturned = nulint;
1301         resp->nextResultSetPosition = nulint;
1302         resp->searchStatus = nulint;
1303         resp->resultSetStatus = none;
1304         resp->presentStatus = 0;
1305     }
1306     else
1307     {
1308         int *toget = (int *)odr_malloc (assoc->encode, sizeof(*toget));
1309         int *presst = (int *)odr_malloc (assoc->encode, sizeof(*presst));
1310         Z_RecordComposition comp, *compp = 0;
1311
1312         *toget = 0;
1313         *presst = 0;
1314         resp->records = 0;
1315         resp->resultCount = &bsrt->hits;
1316
1317         comp.which = Z_RecordComp_simple;
1318         /* how many records does the user agent want, then? */
1319         if (bsrt->hits <= *req->smallSetUpperBound)
1320         {
1321             *toget = bsrt->hits;
1322             if ((comp.u.simple = req->smallSetElementSetNames))
1323                 compp = &comp;
1324         }
1325         else if (bsrt->hits < *req->largeSetLowerBound)
1326         {
1327             *toget = *req->mediumSetPresentNumber;
1328             if (*toget > bsrt->hits)
1329                 *toget = bsrt->hits;
1330             if ((comp.u.simple = req->mediumSetElementSetNames))
1331                 compp = &comp;
1332         }
1333         else
1334             *toget = 0;
1335
1336         if (*toget && !resp->records)
1337         {
1338             oident *prefformat;
1339             oid_value form;
1340
1341             if (!(prefformat = oid_getentbyoid(req->preferredRecordSyntax)) ||
1342                 prefformat->oclass != CLASS_RECSYN)
1343                 form = VAL_NONE;
1344             else
1345                 form = prefformat->value;
1346             resp->records = pack_records(assoc, req->resultSetName, 1,
1347                 toget, compp, next, presst, form);
1348             if (!resp->records)
1349                 return 0;
1350             resp->numberOfRecordsReturned = toget;
1351             resp->nextResultSetPosition = next;
1352             resp->searchStatus = sr;
1353             resp->resultSetStatus = 0;
1354             resp->presentStatus = presst;
1355         }
1356         else
1357         {
1358             if (*resp->resultCount)
1359                 *next = 1;
1360             resp->numberOfRecordsReturned = nulint;
1361             resp->nextResultSetPosition = next;
1362             resp->searchStatus = sr;
1363             resp->resultSetStatus = 0;
1364             resp->presentStatus = 0;
1365         }
1366     }
1367     return apdu;
1368 }
1369
1370 /*
1371  * Maybe we got a little over-friendly when we designed bend_fetch to
1372  * get only one record at a time. Some backends can optimise multiple-record
1373  * fetches, and at any rate, there is some overhead involved in
1374  * all that selecting and hopping around. Problem is, of course, that the
1375  * frontend can't know ahead of time how many records it'll need to
1376  * fill the negotiated PDU size. Annoying. Segmentation or not, Z/SR
1377  * is downright lousy as a bulk data transfer protocol.
1378  *
1379  * To start with, we'll do the fetching of records from the backend
1380  * in one operation: To save some trips in and out of the event-handler,
1381  * and to simplify the interface to pack_records. At any rate, asynch
1382  * operation is more fun in operations that have an unpredictable execution
1383  * speed - which is normally more true for search than for present.
1384  */
1385 static Z_APDU *process_presentRequest(association *assoc, request *reqb,
1386     int *fd)
1387 {
1388     Z_PresentRequest *req = reqb->request->u.presentRequest;
1389     oident *prefformat;
1390     oid_value form;
1391     Z_APDU *apdu;
1392     Z_PresentResponse *resp;
1393     int *presst;
1394     int *next;
1395     int *num;
1396
1397     logf(LOG_LOG, "Got PresentRequest.");
1398
1399     if (!(prefformat = oid_getentbyoid(req->preferredRecordSyntax)) ||
1400         prefformat->oclass != CLASS_RECSYN)
1401         form = VAL_NONE;
1402     else
1403         form = prefformat->value;
1404     if (assoc->bend_present)
1405     {
1406         bend_present_rr *bprr = (bend_present_rr *)nmem_malloc (reqb->request_mem, sizeof(*bprr));
1407         bprr->setname = req->resultSetId;
1408         bprr->start = *req->resultSetStartPoint;
1409         bprr->number = *req->numberOfRecordsRequested;
1410         bprr->format = form;
1411         bprr->comp = req->recordComposition;
1412         bprr->stream = assoc->encode;
1413         bprr->request = reqb;
1414         bprr->association = assoc;
1415         bprr->errcode = 0;
1416         bprr->errstring = NULL;
1417         ((int (*)(void *, bend_present_rr *))(*assoc->bend_present))(assoc->backend, bprr);
1418
1419         if (!bprr->request)
1420             return 0;
1421     }
1422     apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1423     resp = (Z_PresentResponse *)odr_malloc (assoc->encode, sizeof(*resp));
1424     presst = (int *)odr_malloc (assoc->encode, sizeof(*presst));
1425     next = (int *)odr_malloc (assoc->encode, sizeof(*next));
1426     num = (int *)odr_malloc (assoc->encode, sizeof(*num));
1427     *presst = 0;
1428     *next = 0;
1429     *num = *req->numberOfRecordsRequested;
1430
1431     apdu->which = Z_APDU_presentResponse;
1432     apdu->u.presentResponse = resp;
1433     resp->referenceId = req->referenceId;
1434     resp->otherInfo = 0;
1435
1436     resp->records =
1437         pack_records(assoc, req->resultSetId, *req->resultSetStartPoint,
1438                      num, req->recordComposition, next, presst, form);
1439     if (!resp->records)
1440         return 0;
1441     resp->numberOfRecordsReturned = num;
1442     resp->presentStatus = presst;
1443     resp->nextResultSetPosition = next;
1444
1445     return apdu;
1446 }
1447
1448 /*
1449  * Scan was implemented rather in a hurry, and with support for only the basic
1450  * elements of the service in the backend API. Suggestions are welcome.
1451  */
1452 static Z_APDU *process_scanRequest(association *assoc, request *reqb, int *fd)
1453 {
1454     Z_ScanRequest *req = reqb->request->u.scanRequest;
1455     Z_APDU *apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1456     Z_ScanResponse *res = (Z_ScanResponse *)odr_malloc (assoc->encode, sizeof(*res));
1457     int *scanStatus = (int *)odr_malloc (assoc->encode, sizeof(*scanStatus));
1458     int *numberOfEntriesReturned =
1459          (int *)odr_malloc (assoc->encode, sizeof(*numberOfEntriesReturned));
1460     Z_ListEntries *ents = (Z_ListEntries *)odr_malloc (assoc->encode, sizeof(*ents));
1461     Z_DiagRecs *diagrecs_p = NULL;
1462     oident *attent;
1463     bend_scanrequest srq;
1464     bend_scanresult *srs;
1465     oident *attset;
1466
1467     logf(LOG_LOG, "Got ScanRequest");
1468     *scanStatus = Z_Scan_failure;
1469     *numberOfEntriesReturned = 0;
1470
1471     apdu->which = Z_APDU_scanResponse;
1472     apdu->u.scanResponse = res;
1473     res->referenceId = req->referenceId;
1474     res->stepSize = 0;
1475     res->scanStatus = scanStatus;
1476     res->numberOfEntriesReturned = numberOfEntriesReturned;
1477     res->positionOfTerm = 0;
1478     res->entries = ents;
1479     ents->num_entries = 0;
1480     ents->entries = NULL;
1481     ents->num_nonsurrogateDiagnostics = 0;
1482     ents->nonsurrogateDiagnostics = NULL;
1483     res->attributeSet = 0;
1484     res->otherInfo = 0;
1485
1486     if (req->attributeSet && (!(attent = oid_getentbyoid(req->attributeSet)) ||
1487                               attent->oclass != CLASS_ATTSET
1488                               || attent->value != VAL_BIB1))
1489         diagrecs_p = diagrecs(assoc, 121, 0);
1490     else if (req->stepSize && *req->stepSize > 0)
1491         diagrecs_p = diagrecs(assoc, 205, 0);
1492     else
1493     {
1494         if (req->databaseNames)
1495         {
1496             int i;
1497             for (i = 0; i < req->num_databaseNames; i++)
1498                 logf (LOG_LOG, "Database '%s'", req->databaseNames[i]);
1499         }
1500         log_scan_term (req->termListAndStartPoint, attset->value);
1501         srq.num_bases = req->num_databaseNames;
1502         srq.basenames = req->databaseNames;
1503         srq.num_entries = *req->numberOfTermsRequested;
1504         srq.term = req->termListAndStartPoint;
1505         srq.stream = assoc->encode;
1506         if (!(attset = oid_getentbyoid(req->attributeSet)) ||
1507             attset->oclass != CLASS_RECSYN)
1508             srq.attributeset = VAL_NONE;
1509         else
1510             srq.attributeset = attset->value;
1511         srq.term_position = req->preferredPositionInResponse ?
1512             *req->preferredPositionInResponse : 1;
1513         if (!(srs = bend_scan(assoc->backend, &srq, 0)))
1514             diagrecs_p = diagrecs(assoc, 2, 0);
1515         else if (srs->errcode)
1516             diagrecs_p = diagrecs(assoc, srs->errcode, srs->errstring);
1517         else
1518         {
1519             int i;
1520             Z_Entry **tab = (Z_Entry **)
1521                 odr_malloc (assoc->encode, sizeof(*tab) * srs->num_entries);
1522
1523             if (srs->status == BEND_SCAN_PARTIAL)
1524                 *scanStatus = Z_Scan_partial_5;
1525             else
1526                 *scanStatus = Z_Scan_success;
1527             ents->entries = tab;
1528             ents->num_entries = srs->num_entries;
1529             res->numberOfEntriesReturned = &ents->num_entries;
1530             res->positionOfTerm = &srs->term_position;
1531             for (i = 0; i < srs->num_entries; i++)
1532             {
1533                 Z_Entry *e;
1534                 Z_TermInfo *t;
1535                 Odr_oct *o;
1536
1537                 tab[i] = e = (Z_Entry *)odr_malloc(assoc->encode, sizeof(*e));
1538                 if (srs->entries[i].occurrences >= 0)
1539                 {
1540                     e->which = Z_Entry_termInfo;
1541                     e->u.termInfo = t = (Z_TermInfo *)
1542                         odr_malloc(assoc->encode, sizeof(*t));
1543                     t->suggestedAttributes = 0;
1544                     t->displayTerm = 0;
1545                     t->alternativeTerm = 0;
1546                     t->byAttributes = 0;
1547                     t->otherTermInfo = 0;
1548                     t->globalOccurrences = &srs->entries[i].occurrences;
1549                     t->term = (Z_Term *)
1550                         odr_malloc(assoc->encode, sizeof(*t->term));
1551                     t->term->which = Z_Term_general;
1552                     t->term->u.general = o =
1553                         (Odr_oct *)odr_malloc(assoc->encode, sizeof(Odr_oct));
1554                     o->buf = (unsigned char *)
1555                         odr_malloc(assoc->encode, o->len = o->size =
1556                                    strlen(srs->entries[i].term));
1557                     memcpy(o->buf, srs->entries[i].term, o->len);
1558                     logf(LOG_DEBUG, "  term #%d: '%s' (%d)", i,
1559                          srs->entries[i].term, srs->entries[i].occurrences);
1560                 }
1561                 else
1562                 {
1563                     Z_DiagRecs *drecs = diagrecs (assoc,
1564                                                   srs->entries[i].errcode,
1565                                                   srs->entries[i].errstring);
1566                     assert (drecs->num_diagRecs == 1);
1567                     e->which = Z_Entry_surrogateDiagnostic;
1568                     assert (drecs->diagRecs[0]);
1569                     e->u.surrogateDiagnostic = drecs->diagRecs[0];
1570                 }
1571             }
1572         }
1573     }
1574     if (diagrecs_p)
1575     {
1576         ents->num_nonsurrogateDiagnostics = diagrecs_p->num_diagRecs;
1577         ents->nonsurrogateDiagnostics = diagrecs_p->diagRecs;
1578     }
1579     return apdu;
1580 }
1581
1582 static Z_APDU *process_sortRequest(association *assoc, request *reqb,
1583     int *fd)
1584 {
1585     Z_SortRequest *req = reqb->request->u.sortRequest;
1586     Z_SortResponse *res = (Z_SortResponse *)odr_malloc (assoc->encode, sizeof(*res));
1587     bend_sort_rr *bsrr = (bend_sort_rr *)odr_malloc (assoc->encode, sizeof(*bsrr));
1588
1589     Z_APDU *apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1590
1591     logf(LOG_LOG, "Got SortRequest.");
1592
1593 #ifdef ASN_COMPILED
1594     bsrr->num_input_setnames = req->num_inputResultSetNames;
1595     bsrr->input_setnames = req->inputResultSetNames;
1596 #else
1597     bsrr->num_input_setnames = req->inputResultSetNames->num_strings;
1598     bsrr->input_setnames = req->inputResultSetNames->strings;
1599 #endif
1600     bsrr->output_setname = req->sortedResultSetName;
1601     bsrr->sort_sequence = req->sortSequence;
1602     bsrr->stream = assoc->encode;
1603
1604     bsrr->sort_status = Z_SortStatus_failure;
1605     bsrr->errcode = 0;
1606     bsrr->errstring = 0;
1607
1608     ((int (*)(void *, bend_sort_rr *))(*assoc->bend_sort))(assoc->backend, bsrr);
1609
1610     res->referenceId = req->referenceId;
1611     res->sortStatus = (int *)odr_malloc (assoc->encode, sizeof(*res->sortStatus));
1612     *res->sortStatus = bsrr->sort_status;
1613     res->resultSetStatus = 0;
1614     if (bsrr->errcode)
1615     {
1616         Z_DiagRecs *dr = diagrecs (assoc, bsrr->errcode, bsrr->errstring);
1617 #ifdef ASN_COMPILED
1618         res->diagnostics = dr->diagRecs;
1619         res->num_diagnostics = dr->num_diagRecs;
1620 #else
1621         res->diagnostics = dr;
1622 #endif
1623     }
1624     else
1625     {
1626 #ifdef ASN_COMPILED
1627         res->num_diagnostics = 0;
1628 #endif
1629         res->diagnostics = 0;
1630     }
1631     res->otherInfo = 0;
1632
1633     apdu->which = Z_APDU_sortResponse;
1634     apdu->u.sortResponse = res;
1635     return apdu;
1636 }
1637
1638 static Z_APDU *process_deleteRequest(association *assoc, request *reqb,
1639     int *fd)
1640 {
1641     Z_DeleteResultSetRequest *req = reqb->request->u.deleteResultSetRequest;
1642     Z_DeleteResultSetResponse *res = (Z_DeleteResultSetResponse *)
1643         odr_malloc (assoc->encode, sizeof(*res));
1644     bend_delete_rr *bdrr = (bend_delete_rr *)
1645         odr_malloc (assoc->encode, sizeof(*bdrr));
1646     Z_APDU *apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1647
1648     logf(LOG_LOG, "Got DeleteRequest.");
1649
1650     bdrr->num_setnames = req->num_resultSetList;
1651     bdrr->setnames = req->resultSetList;
1652     bdrr->stream = assoc->encode;
1653     bdrr->function = *req->deleteFunction;
1654
1655     ((int (*)(void *, bend_delete_rr *))
1656      (*assoc->bend_delete))(assoc->backend, bdrr);
1657
1658     res->referenceId = req->referenceId;
1659
1660     res->deleteOperationStatus = (int *)
1661         odr_malloc (assoc->encode, sizeof(*res->deleteOperationStatus));
1662     *res->deleteOperationStatus = bdrr->delete_status;
1663
1664     res->deleteListStatuses = 0;
1665     res->numberNotDeleted = 0;
1666     res->bulkStatuses = 0;
1667     res->deleteMessage = 0;
1668     res->otherInfo = 0;
1669
1670     apdu->which = Z_APDU_deleteResultSetResponse;
1671     apdu->u.deleteResultSetResponse = res;
1672     return apdu;
1673 }
1674
1675 static void process_close(association *assoc, request *reqb)
1676 {
1677     Z_Close *req = reqb->request->u.close;
1678     static char *reasons[] =
1679     {
1680         "finished",
1681         "shutdown",
1682         "systemProblem",
1683         "costLimit",
1684         "resources",
1685         "securityViolation",
1686         "protocolError",
1687         "lackOfActivity",
1688         "peerAbort",
1689         "unspecified"
1690     };
1691
1692     logf(LOG_LOG, "Got Close, reason %s, message %s",
1693         reasons[*req->closeReason], req->diagnosticInformation ?
1694         req->diagnosticInformation : "NULL");
1695     if (assoc->version < 3) /* to make do_force respond with close */
1696         assoc->version = 3;
1697     do_close_req(assoc, Z_Close_finished, "Association terminated by client",
1698                  reqb);
1699 }
1700
1701 void save_referenceId (request *reqb, Z_ReferenceId *refid)
1702 {
1703     if (refid)
1704     {
1705         reqb->len_refid = refid->len;
1706         reqb->refid = (char *)nmem_malloc (reqb->request_mem, refid->len);
1707         memcpy (reqb->refid, refid->buf, refid->len);
1708     }
1709     else
1710     {
1711         reqb->len_refid = 0;
1712         reqb->refid = NULL;
1713     }
1714 }
1715
1716 void bend_request_send (bend_association a, bend_request req, Z_APDU *res)
1717 {
1718     process_response (a, req, res);
1719 }
1720
1721 bend_request bend_request_mk (bend_association a)
1722 {
1723     request *nreq = request_get (&a->outgoing);
1724     nreq->request_mem = nmem_create ();
1725     return nreq;
1726 }
1727
1728 Z_ReferenceId *bend_request_getid (ODR odr, bend_request req)
1729 {
1730     Z_ReferenceId *id;
1731     if (!req->refid)
1732         return 0;
1733     id = (Odr_oct *)odr_malloc (odr, sizeof(*odr));
1734     id->buf = (unsigned char *)odr_malloc (odr, req->len_refid);
1735     id->len = id->size = req->len_refid;
1736     memcpy (id->buf, req->refid, req->len_refid);
1737     return id;
1738 }
1739
1740 void bend_request_destroy (bend_request *req)
1741 {
1742     nmem_destroy((*req)->request_mem);
1743     request_release(*req);
1744     *req = NULL;
1745 }
1746
1747 int bend_backend_respond (bend_association a, bend_request req)
1748 {
1749     return process_request (a, req);
1750 }
1751
1752 void bend_request_setdata(bend_request r, void *p)
1753 {
1754     r->clientData = p;
1755 }
1756
1757 void *bend_request_getdata(bend_request r)
1758 {
1759     return r->clientData;
1760 }
1761
1762 /* Chas: Added in from DALI */
1763 static Z_APDU *process_ESRequest(association *assoc, request *reqb, int *fd)
1764 {
1765     bend_esrequest_rr esrequest;
1766
1767     Z_ExtendedServicesRequest *req = reqb->request->u.extendedServicesRequest;
1768     Z_APDU *apdu = zget_APDU(assoc->encode, Z_APDU_extendedServicesResponse);
1769
1770     Z_ExtendedServicesResponse *resp = apdu->u.extendedServicesResponse;
1771
1772     logf(LOG_DEBUG,"inside Process esRequest");
1773
1774     esrequest.esr = reqb->request->u.extendedServicesRequest;
1775     esrequest.stream = assoc->encode;
1776     esrequest.errcode = 0;
1777     esrequest.errstring = NULL;
1778     esrequest.request = reqb;
1779     esrequest.association = assoc;
1780
1781     ((int (*)(void *, bend_esrequest_rr *))(*assoc->bend_esrequest))(assoc->backend,
1782                                                                    &esrequest);
1783
1784     /* If the response is being delayed, return NULL */
1785     if (esrequest.request == NULL)
1786         return(NULL);
1787
1788     resp->referenceId = req->referenceId;
1789
1790     if ( esrequest.errcode == 0 )
1791     {
1792         /* Backend service indicates request will be processed */
1793         logf(LOG_DEBUG,"Request will be processed...Good !");
1794         *resp->operationStatus = Z_ExtendedServicesResponse_done;
1795     }
1796     else
1797     {
1798         /* Backend indicates error, request will not be processed */
1799         logf(LOG_DEBUG,"Request will not be processed...BAD !");
1800         *resp->operationStatus = Z_ExtendedServicesResponse_failure;
1801     }
1802     /* Do something with the members of bend_extendedservice */
1803
1804     logf(LOG_DEBUG,"Send the result apdu");
1805
1806     return apdu;
1807 }
1808
1809 /* Chas: End of addition from DALI */