server/seshigh.c

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