server/seshigh.c

   1 /*
   2  * Copyright (c) 1995-2002, Index Data
   3  * See the file LICENSE for details.
   4  *
   5  * $Id: seshigh.c,v 1.125 2002-01-23 21:13:30 adam Exp $
   6  */
   7
   8 /*
   9  * Frontend server logic.
  10  *
  11  * This code receives incoming APDUs, and handles client requests by means
  12  * of the backend API.
  13  *
  14  * Some of the code is getting quite involved, compared to simpler servers -
  15  * primarily because it is asynchronous both in the communication with
  16  * the user and the backend. We think the complexity will pay off in
  17  * the form of greater flexibility when more asynchronous facilities
  18  * are implemented.
  19  *
  20  * Memory management has become somewhat involved. In the simple case, where
  21  * only one PDU is pending at a time, it will simply reuse the same memory,
  22  * once it has found its working size. When we enable multiple concurrent
  23  * operations, perhaps even with multiple parallel calls to the backend, it
  24  * will maintain a pool of buffers for encoding and decoding, trying to
  25  * minimize memory allocation/deallocation during normal operation.
  26  *
  27  */
  28
  29 #include <stdlib.h>
  30 #include <stdio.h>
  31 #ifdef WIN32
  32 #include <process.h>
  33 #else
  34 #include <unistd.h>
  35 #endif
  36 #include <assert.h>
  37
  38 #include <yaz/yconfig.h>
  39 #include <yaz/xmalloc.h>
  40 #include <yaz/comstack.h>
  41 #include "eventl.h"
  42 #include "session.h"
  43 #include <yaz/proto.h>
  44 #include <yaz/oid.h>
  45 #include <yaz/log.h>
  46 #include <yaz/logrpn.h>
  47 #include <yaz/statserv.h>
  48
  49 #include <yaz/backend.h>
  50
  51 static int process_request(association *assoc, request *req, char **msg);
  52 void backend_response(IOCHAN i, int event);
  53 static int process_response(association *assoc, request *req, Z_APDU *res);
  54 static Z_APDU *process_initRequest(association *assoc, request *reqb);
  55 static Z_APDU *process_searchRequest(association *assoc, request *reqb,
  56     int *fd);
  57 static Z_APDU *response_searchRequest(association *assoc, request *reqb,
  58     bend_search_rr *bsrr, int *fd);
  59 static Z_APDU *process_presentRequest(association *assoc, request *reqb,
  60     int *fd);
  61 static Z_APDU *process_scanRequest(association *assoc, request *reqb, int *fd);
  62 static Z_APDU *process_sortRequest(association *assoc, request *reqb, int *fd);
  63 static void process_close(association *assoc, request *reqb);
  64 void save_referenceId (request *reqb, Z_ReferenceId *refid);
  65 static Z_APDU *process_deleteRequest(association *assoc, request *reqb,
  66     int *fd);
  67 static Z_APDU *process_segmentRequest (association *assoc, request *reqb);
  68
  69 static FILE *apduf = 0; /* for use in static mode */
  70 static statserv_options_block *control_block = 0;
  71
  72 /* Chas: Added in from DALI */
  73 static Z_APDU *process_ESRequest(association *assoc, request *reqb, int *fd);
  74 /* Chas: End of addition from DALI */
  75
  76 /*
  77  * Create and initialize a new association-handle.
  78  *  channel  : iochannel for the current line.
  79  *  link     : communications channel.
  80  * Returns: 0 or a new association handle.
  81  */
  82 association *create_association(IOCHAN channel, COMSTACK link)
  83 {
  84     association *anew;
  85
  86     if (!control_block)
  87         control_block = statserv_getcontrol();
  88     if (!(anew = (association *)xmalloc(sizeof(*anew))))
  89         return 0;
  90     anew->init = 0;
  91     anew->client_chan = channel;
  92     anew->client_link = link;
  93     anew->cs_get_mask = 0;
  94     anew->cs_put_mask = 0;
  95     anew->cs_accept_mask = 0;
  96     if (!(anew->decode = odr_createmem(ODR_DECODE)) ||
  97         !(anew->encode = odr_createmem(ODR_ENCODE)))
  98         return 0;
  99     if (*control_block->apdufile)
 100     {
 101         char filename[256];
 102         FILE *f;
 103
 104         strcpy(filename, control_block->apdufile);
 105         if (!(anew->print = odr_createmem(ODR_PRINT)))
 106             return 0;
 107         if (*control_block->apdufile != '-')
 108         {
 109             strcpy(filename, control_block->apdufile);
 110             if (!control_block->dynamic)
 111             {
 112                 if (!apduf)
 113                 {
 114                     if (!(apduf = fopen(filename, "w")))
 115                     {
 116                         yaz_log(LOG_WARN|LOG_ERRNO, "%s", filename);
 117                         return 0;
 118                     }
 119                     setvbuf(apduf, 0, _IONBF, 0);
 120                 }
 121                 f = apduf;
 122             }
 123             else
 124             {
 125                 sprintf(filename + strlen(filename), ".%d", getpid());
 126                 if (!(f = fopen(filename, "w")))
 127                 {
 128                     yaz_log(LOG_WARN|LOG_ERRNO, "%s", filename);
 129                     return 0;
 130                 }
 131                 setvbuf(f, 0, _IONBF, 0);
 132             }
 133             odr_setprint(anew->print, f);
 134         }
 135     }
 136     else
 137         anew->print = 0;
 138     anew->input_buffer = 0;
 139     anew->input_buffer_len = 0;
 140     anew->backend = 0;
 141     anew->state = ASSOC_NEW;
 142     request_initq(&anew->incoming);
 143     request_initq(&anew->outgoing);
 144     anew->proto = cs_getproto(link);
 145     return anew;
 146 }
 147
 148 /*
 149  * Free association and release resources.
 150  */
 151 void destroy_association(association *h)
 152 {
 153     statserv_options_block *cb = statserv_getcontrol();
 154
 155     xfree(h->init);
 156     odr_destroy(h->decode);
 157     odr_destroy(h->encode);
 158     if (h->print)
 159         odr_destroy(h->print);
 160     if (h->input_buffer)
 161     xfree(h->input_buffer);
 162     if (h->backend)
 163         (*cb->bend_close)(h->backend);
 164     while (request_deq(&h->incoming));
 165     while (request_deq(&h->outgoing));
 166     request_delq(&h->incoming);
 167     request_delq(&h->outgoing);
 168     xfree(h);
 169     if (control_block && control_block->one_shot)
 170         exit (0);
 171 }
 172
 173 static void do_close_req(association *a, int reason, char *message,
 174                          request *req)
 175 {
 176     Z_APDU apdu;
 177     Z_Close *cls = zget_Close(a->encode);
 178
 179     /* Purge request queue */
 180     while (request_deq(&a->incoming));
 181     while (request_deq(&a->outgoing));
 182     if (a->version >= 3)
 183     {
 184         yaz_log(LOG_LOG, "Sending Close PDU, reason=%d, message=%s",
 185             reason, message ? message : "none");
 186         apdu.which = Z_APDU_close;
 187         apdu.u.close = cls;
 188         *cls->closeReason = reason;
 189         cls->diagnosticInformation = message;
 190         process_response(a, req, &apdu);
 191         iochan_settimeout(a->client_chan, 60);
 192     }
 193     else
 194     {
 195         yaz_log(LOG_DEBUG, "v2 client. No Close PDU");
 196         iochan_setevent(a->client_chan, EVENT_TIMEOUT); /* force imm close */
 197     }
 198     a->state = ASSOC_DEAD;
 199 }
 200
 201 static void do_close(association *a, int reason, char *message)
 202 {
 203     do_close_req (a, reason, message, request_get(&a->outgoing));
 204 }
 205
 206 /*
 207  * This is where PDUs from the client are read and the further
 208  * processing is initiated. Flow of control moves down through the
 209  * various process_* functions below, until the encoded result comes back up
 210  * to the output handler in here.
 211  *
 212  *  h     : the I/O channel that has an outstanding event.
 213  *  event : the current outstanding event.
 214  */
 215 void ir_session(IOCHAN h, int event)
 216 {
 217     int res;
 218     association *assoc = (association *)iochan_getdata(h);
 219     COMSTACK conn = assoc->client_link;
 220     request *req;
 221
 222     assert(h && conn && assoc);
 223     if (event == EVENT_TIMEOUT)
 224     {
 225         if (assoc->state != ASSOC_UP)
 226         {
 227             yaz_log(LOG_LOG, "Final timeout - closing connection.");
 228             cs_close(conn);
 229             destroy_association(assoc);
 230             iochan_destroy(h);
 231         }
 232         else
 233         {
 234             yaz_log(LOG_LOG, "Session idle too long. Sending close.");
 235             do_close(assoc, Z_Close_lackOfActivity, 0);
 236         }
 237         return;
 238     }
 239     if (event & assoc->cs_accept_mask)
 240     {
 241         yaz_log (LOG_DEBUG, "ir_session (accept)");
 242         if (!cs_accept (conn))
 243         {
 244             yaz_log (LOG_LOG, "accept failed");
 245             destroy_association(assoc);
 246             iochan_destroy(h);
 247         }
 248         iochan_clearflag (h, EVENT_OUTPUT|EVENT_OUTPUT);
 249         if (conn->io_pending)
 250         {   /* cs_accept didn't complete */
 251             assoc->cs_accept_mask =
 252                 ((conn->io_pending & CS_WANT_WRITE) ? EVENT_OUTPUT : 0) |
 253                 ((conn->io_pending & CS_WANT_READ) ? EVENT_INPUT : 0);
 254
 255             iochan_setflag (h, assoc->cs_accept_mask);
 256         }
 257         else
 258         {   /* cs_accept completed. Prepare for reading (cs_get) */
 259             assoc->cs_accept_mask = 0;
 260             assoc->cs_get_mask = EVENT_INPUT;
 261             iochan_setflag (h, assoc->cs_get_mask);
 262         }
 263         return;
 264     }
 265     if ((event & assoc->cs_get_mask) || (event & EVENT_WORK)) /* input */
 266     {
 267         if ((assoc->cs_put_mask & EVENT_INPUT) == 0 && (event & assoc->cs_get_mask))
 268         {
 269             yaz_log(LOG_DEBUG, "ir_session (input)");
 270             /* We aren't speaking to this fellow */
 271             if (assoc->state == ASSOC_DEAD)
 272             {
 273                 yaz_log(LOG_LOG, "Closed connection after reject");
 274                 cs_close(conn);
 275                 destroy_association(assoc);
 276                 iochan_destroy(h);
 277                 return;
 278             }
 279             assoc->cs_get_mask = EVENT_INPUT;
 280             if ((res = cs_get(conn, &assoc->input_buffer,
 281                 &assoc->input_buffer_len)) <= 0)
 282             {
 283                 yaz_log(LOG_LOG, "Connection closed by client");
 284                 cs_close(conn);
 285                 destroy_association(assoc);
 286                 iochan_destroy(h);
 287                 return;
 288             }
 289             else if (res == 1) /* incomplete read - wait for more  */
 290             {
 291                 if (conn->io_pending & CS_WANT_WRITE)
 292                     assoc->cs_get_mask |= EVENT_OUTPUT;
 293                 iochan_setflag(h, assoc->cs_get_mask);
 294                 return;
 295             }
 296             if (cs_more(conn)) /* more stuff - call us again later, please */
 297                 iochan_setevent(h, EVENT_INPUT);
 298
 299             /* we got a complete PDU. Let's decode it */
 300             yaz_log(LOG_DEBUG, "Got PDU, %d bytes", res);
 301             req = request_get(&assoc->incoming); /* get a new request structure */
 302             odr_reset(assoc->decode);
 303             odr_setbuf(assoc->decode, assoc->input_buffer, res, 0);
 304             if (!z_APDU(assoc->decode, &req->apdu_request, 0, 0))
 305             {
 306                 yaz_log(LOG_LOG, "ODR error on incoming PDU: %s [near byte %d] ",
 307                         odr_errmsg(odr_geterror(assoc->decode)),
 308                         odr_offset(assoc->decode));
 309                 yaz_log(LOG_LOG, "PDU dump:");
 310                 odr_dumpBER(yaz_log_file(), assoc->input_buffer, res);
 311                 do_close(assoc, Z_Close_protocolError, "Malformed package");
 312                 return;
 313             }
 314             req->request_mem = odr_extract_mem(assoc->decode);
 315             if (assoc->print && !z_APDU(assoc->print, &req->apdu_request, 0, 0))
 316             {
 317                 yaz_log(LOG_WARN, "ODR print error: %s",
 318                     odr_errmsg(odr_geterror(assoc->print)));
 319                 odr_reset(assoc->print);
 320             }
 321             request_enq(&assoc->incoming, req);
 322         }
 323
 324         /* can we do something yet? */
 325         req = request_head(&assoc->incoming);
 326         if (req->state == REQUEST_IDLE)
 327         {
 328             char *msg;
 329             request_deq(&assoc->incoming);
 330             if (process_request(assoc, req, &msg) < 0)
 331                 do_close_req(assoc, Z_Close_systemProblem, msg, req);
 332         }
 333     }
 334     if (event & assoc->cs_put_mask)
 335     {
 336         request *req = request_head(&assoc->outgoing);
 337
 338         assoc->cs_put_mask = 0;
 339         yaz_log(LOG_DEBUG, "ir_session (output)");
 340         req->state = REQUEST_PENDING;
 341         switch (res = cs_put(conn, req->response, req->len_response))
 342         {
 343         case -1:
 344             yaz_log(LOG_LOG, "Connection closed by client");
 345             cs_close(conn);
 346             destroy_association(assoc);
 347             iochan_destroy(h);
 348             break;
 349         case 0: /* all sent - release the request structure */
 350             yaz_log(LOG_DEBUG, "Wrote PDU, %d bytes", req->len_response);
 351             nmem_destroy(req->request_mem);
 352             request_deq(&assoc->outgoing);
 353             request_release(req);
 354             if (!request_head(&assoc->outgoing))
 355             {   /* restore mask for cs_get operation ... */
 356                 iochan_clearflag(h, EVENT_OUTPUT|EVENT_INPUT);
 357                 iochan_setflag(h, assoc->cs_get_mask);
 358             }
 359             break;
 360         default:
 361             if (conn->io_pending & CS_WANT_WRITE)
 362                 assoc->cs_put_mask |= EVENT_OUTPUT;
 363             if (conn->io_pending & CS_WANT_READ)
 364                 assoc->cs_put_mask |= EVENT_INPUT;
 365             iochan_setflag(h, assoc->cs_put_mask);
 366         }
 367     }
 368     if (event & EVENT_EXCEPT)
 369     {
 370         yaz_log(LOG_LOG, "ir_session (exception)");
 371         cs_close(conn);
 372         destroy_association(assoc);
 373         iochan_destroy(h);
 374     }
 375 }
 376
 377 /*
 378  * Initiate request processing.
 379  */
 380 static int process_request(association *assoc, request *req, char **msg)
 381 {
 382     int fd = -1;
 383     Z_APDU *res;
 384     int retval;
 385
 386     *msg = "Unknown Error";
 387     assert(req && req->state == REQUEST_IDLE);
 388     if (req->apdu_request->which != Z_APDU_initRequest && !assoc->init)
 389     {
 390         *msg = "Missing InitRequest";
 391         return -1;
 392     }
 393     switch (req->apdu_request->which)
 394     {
 395     case Z_APDU_initRequest:
 396         res = process_initRequest(assoc, req); break;
 397     case Z_APDU_searchRequest:
 398         res = process_searchRequest(assoc, req, &fd); break;
 399     case Z_APDU_presentRequest:
 400         res = process_presentRequest(assoc, req, &fd); break;
 401     case Z_APDU_scanRequest:
 402         if (assoc->init->bend_scan)
 403             res = process_scanRequest(assoc, req, &fd);
 404         else
 405         {
 406             *msg = "Cannot handle Scan APDU";
 407             return -1;
 408         }
 409         break;
 410     case Z_APDU_extendedServicesRequest:
 411         if (assoc->init->bend_esrequest)
 412             res = process_ESRequest(assoc, req, &fd);
 413         else
 414         {
 415             *msg = "Cannot handle Extended Services APDU";
 416             return -1;
 417         }
 418         break;
 419     case Z_APDU_sortRequest:
 420         if (assoc->init->bend_sort)
 421             res = process_sortRequest(assoc, req, &fd);
 422         else
 423         {
 424             *msg = "Cannot handle Sort APDU";
 425             return -1;
 426         }
 427         break;
 428     case Z_APDU_close:
 429         process_close(assoc, req);
 430         return 0;
 431     case Z_APDU_deleteResultSetRequest:
 432         if (assoc->init->bend_delete)
 433             res = process_deleteRequest(assoc, req, &fd);
 434         else
 435         {
 436             *msg = "Cannot handle Delete APDU";
 437             return -1;
 438         }
 439         break;
 440     case Z_APDU_segmentRequest:
 441         if (assoc->init->bend_segment)
 442         {
 443             res = process_segmentRequest (assoc, req);
 444         }
 445         else
 446         {
 447             *msg = "Cannot handle Segment APDU";
 448             return -1;
 449         }
 450         break;
 451     default:
 452         *msg = "Bad APDU received";
 453         return -1;
 454     }
 455     if (res)
 456     {
 457         yaz_log(LOG_DEBUG, "  result immediately available");
 458         retval = process_response(assoc, req, res);
 459     }
 460     else if (fd < 0)
 461     {
 462         yaz_log(LOG_DEBUG, "  result unavailble");
 463         retval = 0;
 464     }
 465     else /* no result yet - one will be provided later */
 466     {
 467         IOCHAN chan;
 468
 469         /* Set up an I/O handler for the fd supplied by the backend */
 470
 471         yaz_log(LOG_DEBUG, "   establishing handler for result");
 472         req->state = REQUEST_PENDING;
 473         if (!(chan = iochan_create(fd, backend_response, EVENT_INPUT)))
 474             abort();
 475         iochan_setdata(chan, assoc);
 476         retval = 0;
 477     }
 478     return retval;
 479 }
 480
 481 /*
 482  * Handle message from the backend.
 483  */
 484 void backend_response(IOCHAN i, int event)
 485 {
 486     association *assoc = (association *)iochan_getdata(i);
 487     request *req = request_head(&assoc->incoming);
 488     Z_APDU *res;
 489     int fd;
 490
 491     yaz_log(LOG_DEBUG, "backend_response");
 492     assert(assoc && req && req->state != REQUEST_IDLE);
 493     /* determine what it is we're waiting for */
 494     switch (req->apdu_request->which)
 495     {
 496         case Z_APDU_searchRequest:
 497             res = response_searchRequest(assoc, req, 0, &fd); break;
 498 #if 0
 499         case Z_APDU_presentRequest:
 500             res = response_presentRequest(assoc, req, 0, &fd); break;
 501         case Z_APDU_scanRequest:
 502             res = response_scanRequest(assoc, req, 0, &fd); break;
 503 #endif
 504         default:
 505             yaz_log(LOG_WARN, "Serious programmer's lapse or bug");
 506             abort();
 507     }
 508     if ((res && process_response(assoc, req, res) < 0) || fd < 0)
 509     {
 510         yaz_log(LOG_LOG, "Fatal error when talking to backend");
 511         do_close(assoc, Z_Close_systemProblem, 0);
 512         iochan_destroy(i);
 513         return;
 514     }
 515     else if (!res) /* no result yet - try again later */
 516     {
 517         yaz_log(LOG_DEBUG, "   no result yet");
 518         iochan_setfd(i, fd); /* in case fd has changed */
 519     }
 520 }
 521
 522 /*
 523  * Encode response, and transfer the request structure to the outgoing queue.
 524  */
 525 static int process_response(association *assoc, request *req, Z_APDU *res)
 526 {
 527     odr_setbuf(assoc->encode, req->response, req->size_response, 1);
 528
 529     if (assoc->print && !z_APDU(assoc->print, &res, 0, 0))
 530     {
 531         yaz_log(LOG_WARN, "ODR print error: %s",
 532             odr_errmsg(odr_geterror(assoc->print)));
 533         odr_reset(assoc->print);
 534     }
 535     if (!z_APDU(assoc->encode, &res, 0, 0))
 536     {
 537         yaz_log(LOG_WARN, "ODR error when encoding response: %s",
 538             odr_errmsg(odr_geterror(assoc->decode)));
 539         return -1;
 540     }
 541     req->response = odr_getbuf(assoc->encode, &req->len_response,
 542         &req->size_response);
 543     odr_setbuf(assoc->encode, 0, 0, 0); /* don'txfree if we abort later */
 544     odr_reset(assoc->encode);
 545     req->state = REQUEST_IDLE;
 546     request_enq(&assoc->outgoing, req);
 547     /* turn the work over to the ir_session handler */
 548     iochan_setflag(assoc->client_chan, EVENT_OUTPUT);
 549     assoc->cs_put_mask = EVENT_OUTPUT;
 550     /* Is there more work to be done? give that to the input handler too */
 551 #if 1
 552     if (request_head(&assoc->incoming))
 553     {
 554         yaz_log (LOG_DEBUG, "more work to be done");
 555         iochan_setevent(assoc->client_chan, EVENT_WORK);
 556     }
 557 #endif
 558     return 0;
 559 }
 560
 561 /*
 562  * Handle init request.
 563  * At the moment, we don't check the options
 564  * anywhere else in the code - we just try not to do anything that would
 565  * break a naive client. We'll toss 'em into the association block when
 566  * we need them there.
 567  */
 568 static Z_APDU *process_initRequest(association *assoc, request *reqb)
 569 {
 570     statserv_options_block *cb = statserv_getcontrol();
 571     Z_InitRequest *req = reqb->apdu_request->u.initRequest;
 572     Z_APDU *apdu = zget_APDU(assoc->encode, Z_APDU_initResponse);
 573     Z_InitResponse *resp = apdu->u.initResponse;
 574     bend_initresult *binitres;
 575     char options[100];
 576
 577     xfree (assoc->init);
 578     assoc->init = (bend_initrequest *) xmalloc (sizeof(*assoc->init));
 579
 580     yaz_log(LOG_LOG, "Got initRequest");
 581     if (req->implementationId)
 582         yaz_log(LOG_LOG, "Id:        %s", req->implementationId);
 583     if (req->implementationName)
 584         yaz_log(LOG_LOG, "Name:      %s", req->implementationName);
 585     if (req->implementationVersion)
 586         yaz_log(LOG_LOG, "Version:   %s", req->implementationVersion);
 587
 588     assoc->init->stream = assoc->encode;
 589     assoc->init->print = assoc->print;
 590     assoc->init->auth = req->idAuthentication;
 591     assoc->init->referenceId = req->referenceId;
 592     assoc->init->implementation_version = 0;
 593     assoc->init->implementation_name = 0;
 594     assoc->init->bend_sort = NULL;
 595     assoc->init->bend_search = NULL;
 596     assoc->init->bend_present = NULL;
 597     assoc->init->bend_esrequest = NULL;
 598     assoc->init->bend_delete = NULL;
 599     assoc->init->bend_scan = NULL;
 600     assoc->init->bend_segment = NULL;
 601     assoc->init->bend_fetch = NULL;
 602
 603     assoc->init->peer_name =
 604         odr_strdup (assoc->encode, cs_addrstr(assoc->client_link));
 605     if (!(binitres = (*cb->bend_init)(assoc->init)))
 606     {
 607         yaz_log(LOG_WARN, "Bad response from backend.");
 608         return 0;
 609     }
 610
 611     assoc->backend = binitres->handle;
 612     if ((assoc->init->bend_sort))
 613         yaz_log (LOG_DEBUG, "Sort handler installed");
 614     if ((assoc->init->bend_search))
 615         yaz_log (LOG_DEBUG, "Search handler installed");
 616     if ((assoc->init->bend_present))
 617         yaz_log (LOG_DEBUG, "Present handler installed");
 618     if ((assoc->init->bend_esrequest))
 619         yaz_log (LOG_DEBUG, "ESRequest handler installed");
 620     if ((assoc->init->bend_delete))
 621         yaz_log (LOG_DEBUG, "Delete handler installed");
 622     if ((assoc->init->bend_scan))
 623         yaz_log (LOG_DEBUG, "Scan handler installed");
 624     if ((assoc->init->bend_segment))
 625         yaz_log (LOG_DEBUG, "Segment handler installed");
 626
 627     resp->referenceId = req->referenceId;
 628     *options = '\0';
 629     /* let's tell the client what we can do */
 630     if (ODR_MASK_GET(req->options, Z_Options_search))
 631     {
 632         ODR_MASK_SET(resp->options, Z_Options_search);
 633         strcat(options, "srch");
 634     }
 635     if (ODR_MASK_GET(req->options, Z_Options_present))
 636     {
 637         ODR_MASK_SET(resp->options, Z_Options_present);
 638         strcat(options, " prst");
 639     }
 640     if (ODR_MASK_GET(req->options, Z_Options_delSet) &&
 641         assoc->init->bend_delete)
 642     {
 643         ODR_MASK_SET(resp->options, Z_Options_delSet);
 644         strcat(options, " del");
 645     }
 646     if (ODR_MASK_GET(req->options, Z_Options_extendedServices) &&
 647         assoc->init->bend_esrequest)
 648     {
 649         ODR_MASK_SET(resp->options, Z_Options_extendedServices);
 650         strcat (options, " extendedServices");
 651     }
 652     if (ODR_MASK_GET(req->options, Z_Options_namedResultSets))
 653     {
 654         ODR_MASK_SET(resp->options, Z_Options_namedResultSets);
 655         strcat(options, " namedresults");
 656     }
 657     if (ODR_MASK_GET(req->options, Z_Options_scan) && assoc->init->bend_scan)
 658     {
 659         ODR_MASK_SET(resp->options, Z_Options_scan);
 660         strcat(options, " scan");
 661     }
 662     if (ODR_MASK_GET(req->options, Z_Options_concurrentOperations))
 663     {
 664         ODR_MASK_SET(resp->options, Z_Options_concurrentOperations);
 665         strcat(options, " concurop");
 666     }
 667     if (ODR_MASK_GET(req->options, Z_Options_sort) && assoc->init->bend_sort)
 668     {
 669         ODR_MASK_SET(resp->options, Z_Options_sort);
 670         strcat(options, " sort");
 671     }
 672     if (ODR_MASK_GET(req->protocolVersion, Z_ProtocolVersion_1))
 673     {
 674         ODR_MASK_SET(resp->protocolVersion, Z_ProtocolVersion_1);
 675         assoc->version = 2; /* 1 & 2 are equivalent */
 676     }
 677     if (ODR_MASK_GET(req->protocolVersion, Z_ProtocolVersion_2))
 678     {
 679         ODR_MASK_SET(resp->protocolVersion, Z_ProtocolVersion_2);
 680         assoc->version = 2;
 681     }
 682     if (ODR_MASK_GET(req->protocolVersion, Z_ProtocolVersion_3))
 683     {
 684         ODR_MASK_SET(resp->protocolVersion, Z_ProtocolVersion_3);
 685         assoc->version = 3;
 686     }
 687     yaz_log(LOG_LOG, "Negotiated to v%d: %s", assoc->version, options);
 688     assoc->maximumRecordSize = *req->maximumRecordSize;
 689     if (assoc->maximumRecordSize > control_block->maxrecordsize)
 690         assoc->maximumRecordSize = control_block->maxrecordsize;
 691     assoc->preferredMessageSize = *req->preferredMessageSize;
 692     if (assoc->preferredMessageSize > assoc->maximumRecordSize)
 693         assoc->preferredMessageSize = assoc->maximumRecordSize;
 694
 695 #if 0
 696     assoc->maximumRecordSize = 3000000;
 697     assoc->preferredMessageSize = 3000000;
 698 #endif
 699
 700     resp->preferredMessageSize = &assoc->preferredMessageSize;
 701     resp->maximumRecordSize = &assoc->maximumRecordSize;
 702
 703     resp->implementationName = "GFS/YAZ";
 704
 705     if (assoc->init->implementation_name)
 706     {
 707         char *nv = (char *)
 708             odr_malloc (assoc->encode,
 709                         strlen(assoc->init->implementation_name) + 10 +
 710                                strlen(resp->implementationName));
 711         sprintf (nv, "%s / %s",
 712                  resp->implementationName, assoc->init->implementation_name);
 713         resp->implementationName = nv;
 714     }
 715     if (assoc->init->implementation_version)
 716     {
 717         char *nv = (char *)
 718             odr_malloc (assoc->encode,
 719                         strlen(assoc->init->implementation_version) + 10 +
 720                                strlen(resp->implementationVersion));
 721         sprintf (nv, "YAZ %s / %s",
 722                  resp->implementationVersion,
 723                  assoc->init->implementation_version);
 724         resp->implementationVersion = nv;
 725     }
 726
 727     if (binitres->errcode)
 728     {
 729         yaz_log(LOG_LOG, "Connection rejected by backend.");
 730         *resp->result = 0;
 731         assoc->state = ASSOC_DEAD;
 732     }
 733     else
 734         assoc->state = ASSOC_UP;
 735     return apdu;
 736 }
 737
 738 /*
 739  * These functions should be merged.
 740  */
 741
 742 static void set_addinfo (Z_DefaultDiagFormat *dr, char *addinfo, ODR odr)
 743 {
 744     dr->which = Z_DefaultDiagFormat_v2Addinfo;
 745     dr->u.v2Addinfo = odr_strdup (odr, addinfo ? addinfo : "");
 746 }
 747
 748 /*
 749  * nonsurrogate diagnostic record.
 750  */
 751 static Z_Records *diagrec(association *assoc, int error, char *addinfo)
 752 {
 753     Z_Records *rec = (Z_Records *)
 754         odr_malloc (assoc->encode, sizeof(*rec));
 755     int *err = odr_intdup(assoc->encode, error);
 756     Z_DiagRec *drec = (Z_DiagRec *)
 757         odr_malloc (assoc->encode, sizeof(*drec));
 758     Z_DefaultDiagFormat *dr = (Z_DefaultDiagFormat *)
 759         odr_malloc (assoc->encode, sizeof(*dr));
 760
 761     yaz_log(LOG_LOG, "[%d] %s %s%s", error, diagbib1_str(error),
 762         addinfo ? " -- " : "", addinfo ? addinfo : "", error);
 763     rec->which = Z_Records_NSD;
 764     rec->u.nonSurrogateDiagnostic = dr;
 765     dr->diagnosticSetId =
 766         yaz_oidval_to_z3950oid (assoc->encode, CLASS_DIAGSET, VAL_BIB1);
 767     dr->condition = err;
 768     set_addinfo (dr, addinfo, assoc->encode);
 769     return rec;
 770 }
 771
 772 /*
 773  * surrogate diagnostic.
 774  */
 775 static Z_NamePlusRecord *surrogatediagrec(association *assoc, char *dbname,
 776                                           int error, char *addinfo)
 777 {
 778     Z_NamePlusRecord *rec = (Z_NamePlusRecord *)
 779         odr_malloc (assoc->encode, sizeof(*rec));
 780     int *err = odr_intdup(assoc->encode, error);
 781     Z_DiagRec *drec = (Z_DiagRec *)odr_malloc (assoc->encode, sizeof(*drec));
 782     Z_DefaultDiagFormat *dr = (Z_DefaultDiagFormat *)
 783         odr_malloc (assoc->encode, sizeof(*dr));
 784
 785     yaz_log(LOG_DEBUG, "SurrogateDiagnotic: %d -- %s", error, addinfo);
 786     rec->databaseName = dbname;
 787     rec->which = Z_NamePlusRecord_surrogateDiagnostic;
 788     rec->u.surrogateDiagnostic = drec;
 789     drec->which = Z_DiagRec_defaultFormat;
 790     drec->u.defaultFormat = dr;
 791     dr->diagnosticSetId =
 792         yaz_oidval_to_z3950oid (assoc->encode, CLASS_DIAGSET, VAL_BIB1);
 793     dr->condition = err;
 794     set_addinfo (dr, addinfo, assoc->encode);
 795
 796     return rec;
 797 }
 798
 799 /*
 800  * multiple nonsurrogate diagnostics.
 801  */
 802 static Z_DiagRecs *diagrecs(association *assoc, int error, char *addinfo)
 803 {
 804     Z_DiagRecs *recs = (Z_DiagRecs *)odr_malloc (assoc->encode, sizeof(*recs));
 805     int *err = odr_intdup(assoc->encode, error);
 806     Z_DiagRec **recp = (Z_DiagRec **)odr_malloc (assoc->encode, sizeof(*recp));
 807     Z_DiagRec *drec = (Z_DiagRec *)odr_malloc (assoc->encode, sizeof(*drec));
 808     Z_DefaultDiagFormat *rec = (Z_DefaultDiagFormat *)
 809         odr_malloc (assoc->encode, sizeof(*rec));
 810
 811     yaz_log(LOG_DEBUG, "DiagRecs: %d -- %s", error, addinfo ? addinfo : "");
 812
 813     recs->num_diagRecs = 1;
 814     recs->diagRecs = recp;
 815     recp[0] = drec;
 816     drec->which = Z_DiagRec_defaultFormat;
 817     drec->u.defaultFormat = rec;
 818
 819     rec->diagnosticSetId =
 820         yaz_oidval_to_z3950oid (assoc->encode, CLASS_DIAGSET, VAL_BIB1);
 821     rec->condition = err;
 822
 823     rec->which = Z_DefaultDiagFormat_v2Addinfo;
 824     rec->u.v2Addinfo = odr_strdup (assoc->encode, addinfo ? addinfo : "");
 825     return recs;
 826 }
 827
 828 static Z_Records *pack_records(association *a, char *setname, int start,
 829                                int *num, Z_RecordComposition *comp,
 830                                int *next, int *pres, oid_value format,
 831                                Z_ReferenceId *referenceId,
 832                                int *oid)
 833 {
 834     int recno, total_length = 0, toget = *num, dumped_records = 0;
 835     Z_Records *records =
 836         (Z_Records *) odr_malloc (a->encode, sizeof(*records));
 837     Z_NamePlusRecordList *reclist =
 838         (Z_NamePlusRecordList *) odr_malloc (a->encode, sizeof(*reclist));
 839     Z_NamePlusRecord **list =
 840         (Z_NamePlusRecord **) odr_malloc (a->encode, sizeof(*list) * toget);
 841
 842     records->which = Z_Records_DBOSD;
 843     records->u.databaseOrSurDiagnostics = reclist;
 844     reclist->num_records = 0;
 845     reclist->records = list;
 846     *pres = Z_PRES_SUCCESS;
 847     *num = 0;
 848     *next = 0;
 849
 850     yaz_log(LOG_LOG, "Request to pack %d+%d+%s", start, toget, setname);
 851     yaz_log(LOG_DEBUG, "pms=%d, mrs=%d", a->preferredMessageSize,
 852         a->maximumRecordSize);
 853     for (recno = start; reclist->num_records < toget; recno++)
 854     {
 855         bend_fetch_rr freq;
 856         Z_NamePlusRecord *thisrec;
 857         int this_length = 0;
 858         /*
 859          * we get the number of bytes allocated on the stream before any
 860          * allocation done by the backend - this should give us a reasonable
 861          * idea of the total size of the data so far.
 862          */
 863         total_length = odr_total(a->encode) - dumped_records;
 864         freq.errcode = 0;
 865         freq.errstring = 0;
 866         freq.basename = 0;
 867         freq.len = 0;
 868         freq.record = 0;
 869         freq.last_in_set = 0;
 870         freq.setname = setname;
 871         freq.surrogate_flag = 0;
 872         freq.number = recno;
 873         freq.comp = comp;
 874         freq.request_format = format;
 875         freq.request_format_raw = oid;
 876         freq.output_format = format;
 877         freq.output_format_raw = 0;
 878         freq.stream = a->encode;
 879         freq.print = a->print;
 880         freq.surrogate_flag = 0;
 881         freq.referenceId = referenceId;
 882         (*a->init->bend_fetch)(a->backend, &freq);
 883         /* backend should be able to signal whether error is system-wide
 884            or only pertaining to current record */
 885         if (freq.errcode)
 886         {
 887             if (!freq.surrogate_flag)
 888             {
 889                 char s[20];
 890                 *pres = Z_PRES_FAILURE;
 891                 /* for 'present request out of range',
 892                    set addinfo to record position if not set */
 893                 if (freq.errcode == 13 && freq.errstring == 0)
 894                 {
 895                     sprintf (s, "%d", recno);
 896                     freq.errstring = s;
 897                 }
 898                 return diagrec(a, freq.errcode, freq.errstring);
 899             }
 900             reclist->records[reclist->num_records] =
 901                 surrogatediagrec(a, freq.basename, freq.errcode,
 902                                  freq.errstring);
 903             reclist->num_records++;
 904             *next = freq.last_in_set ? 0 : recno + 1;
 905             continue;
 906         }
 907         if (freq.len >= 0)
 908             this_length = freq.len;
 909         else
 910             this_length = odr_total(a->encode) - total_length;
 911         yaz_log(LOG_DEBUG, "  fetched record, len=%d, total=%d",
 912             this_length, total_length);
 913         if (this_length + total_length > a->preferredMessageSize)
 914         {
 915             /* record is small enough, really */
 916             if (this_length <= a->preferredMessageSize)
 917             {
 918                 yaz_log(LOG_DEBUG, "  Dropped last normal-sized record");
 919                 *pres = Z_PRES_PARTIAL_2;
 920                 break;
 921             }
 922             /* record can only be fetched by itself */
 923             if (this_length < a->maximumRecordSize)
 924             {
 925                 yaz_log(LOG_DEBUG, "  Record > prefmsgsz");
 926                 if (toget > 1)
 927                 {
 928                     yaz_log(LOG_DEBUG, "  Dropped it");
 929                     reclist->records[reclist->num_records] =
 930                          surrogatediagrec(a, freq.basename, 16, 0);
 931                     reclist->num_records++;
 932                     *next = freq.last_in_set ? 0 : recno + 1;
 933                     dumped_records += this_length;
 934                     continue;
 935                 }
 936             }
 937             else /* too big entirely */
 938             {
 939                 yaz_log(LOG_DEBUG, "Record > maxrcdsz");
 940                 reclist->records[reclist->num_records] =
 941                     surrogatediagrec(a, freq.basename, 17, 0);
 942                 reclist->num_records++;
 943                 *next = freq.last_in_set ? 0 : recno + 1;
 944                 dumped_records += this_length;
 945                 continue;
 946             }
 947         }
 948
 949         if (!(thisrec = (Z_NamePlusRecord *)
 950               odr_malloc(a->encode, sizeof(*thisrec))))
 951             return 0;
 952         if (!(thisrec->databaseName = (char *)odr_malloc(a->encode,
 953             strlen(freq.basename) + 1)))
 954             return 0;
 955         strcpy(thisrec->databaseName, freq.basename);
 956         thisrec->which = Z_NamePlusRecord_databaseRecord;
 957
 958         if (freq.output_format_raw)
 959         {
 960             struct oident *ident = oid_getentbyoid(freq.output_format_raw);
 961             freq.output_format = ident->value;
 962         }
 963         thisrec->u.databaseRecord = z_ext_record(a->encode, freq.output_format,
 964                                                  freq.record, freq.len);
 965         if (!thisrec->u.databaseRecord)
 966             return 0;
 967         reclist->records[reclist->num_records] = thisrec;
 968         reclist->num_records++;
 969         *next = freq.last_in_set ? 0 : recno + 1;
 970     }
 971     *num = reclist->num_records;
 972     return records;
 973 }
 974
 975 static Z_APDU *process_searchRequest(association *assoc, request *reqb,
 976     int *fd)
 977 {
 978     Z_SearchRequest *req = reqb->apdu_request->u.searchRequest;
 979     bend_search_rr *bsrr =
 980         (bend_search_rr *)nmem_malloc (reqb->request_mem, sizeof(*bsrr));
 981
 982     yaz_log(LOG_LOG, "Got SearchRequest.");
 983     bsrr->fd = fd;
 984     bsrr->request = reqb;
 985     bsrr->association = assoc;
 986     bsrr->referenceId = req->referenceId;
 987     save_referenceId (reqb, bsrr->referenceId);
 988
 989     yaz_log (LOG_LOG, "ResultSet '%s'", req->resultSetName);
 990     if (req->databaseNames)
 991     {
 992         int i;
 993         for (i = 0; i < req->num_databaseNames; i++)
 994             yaz_log (LOG_LOG, "Database '%s'", req->databaseNames[i]);
 995     }
 996     switch (req->query->which)
 997     {
 998     case Z_Query_type_1: case Z_Query_type_101:
 999         log_rpn_query (req->query->u.type_1);
1000     }
1001     if (assoc->init->bend_search)
1002     {
1003         bsrr->setname = req->resultSetName;
1004         bsrr->replace_set = *req->replaceIndicator;
1005         bsrr->num_bases = req->num_databaseNames;
1006         bsrr->basenames = req->databaseNames;
1007         bsrr->query = req->query;
1008         bsrr->stream = assoc->encode;
1009         bsrr->decode = assoc->decode;
1010         bsrr->print = assoc->print;
1011         bsrr->errcode = 0;
1012         bsrr->hits = 0;
1013         bsrr->errstring = NULL;
1014         (assoc->init->bend_search)(assoc->backend, bsrr);
1015         if (!bsrr->request)
1016             return 0;
1017     }
1018     return response_searchRequest(assoc, reqb, bsrr, fd);
1019 }
1020
1021 int bend_searchresponse(void *handle, bend_search_rr *bsrr) {return 0;}
1022
1023 /*
1024  * Prepare a searchresponse based on the backend results. We probably want
1025  * to look at making the fetching of records nonblocking as well, but
1026  * so far, we'll keep things simple.
1027  * If bsrt is null, that means we're called in response to a communications
1028  * event, and we'll have to get the response for ourselves.
1029  */
1030 static Z_APDU *response_searchRequest(association *assoc, request *reqb,
1031     bend_search_rr *bsrt, int *fd)
1032 {
1033     Z_SearchRequest *req = reqb->apdu_request->u.searchRequest;
1034     Z_APDU *apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1035     Z_SearchResponse *resp = (Z_SearchResponse *)
1036         odr_malloc (assoc->encode, sizeof(*resp));
1037     int *nulint = odr_intdup (assoc->encode, 0);
1038     bool_t *sr = odr_intdup(assoc->encode, 1);
1039     int *next = odr_intdup(assoc->encode, 0);
1040     int *none = odr_intdup(assoc->encode, Z_RES_NONE);
1041
1042     apdu->which = Z_APDU_searchResponse;
1043     apdu->u.searchResponse = resp;
1044     resp->referenceId = req->referenceId;
1045     resp->additionalSearchInfo = 0;
1046     resp->otherInfo = 0;
1047     *fd = -1;
1048     if (!bsrt && !bend_searchresponse(assoc->backend, bsrt))
1049     {
1050         yaz_log(LOG_FATAL, "Bad result from backend");
1051         return 0;
1052     }
1053     else if (bsrt->errcode)
1054     {
1055         resp->records = diagrec(assoc, bsrt->errcode, bsrt->errstring);
1056         resp->resultCount = nulint;
1057         resp->numberOfRecordsReturned = nulint;
1058         resp->nextResultSetPosition = nulint;
1059         resp->searchStatus = nulint;
1060         resp->resultSetStatus = none;
1061         resp->presentStatus = 0;
1062     }
1063     else
1064     {
1065         int *toget = odr_intdup(assoc->encode, 0);
1066         int *presst = odr_intdup(assoc->encode, 0);
1067         Z_RecordComposition comp, *compp = 0;
1068
1069         yaz_log (LOG_LOG, "resultCount: %d", bsrt->hits);
1070
1071         resp->records = 0;
1072         resp->resultCount = &bsrt->hits;
1073
1074         comp.which = Z_RecordComp_simple;
1075         /* how many records does the user agent want, then? */
1076         if (bsrt->hits <= *req->smallSetUpperBound)
1077         {
1078             *toget = bsrt->hits;
1079             if ((comp.u.simple = req->smallSetElementSetNames))
1080                 compp = &comp;
1081         }
1082         else if (bsrt->hits < *req->largeSetLowerBound)
1083         {
1084             *toget = *req->mediumSetPresentNumber;
1085             if (*toget > bsrt->hits)
1086                 *toget = bsrt->hits;
1087             if ((comp.u.simple = req->mediumSetElementSetNames))
1088                 compp = &comp;
1089         }
1090         else
1091             *toget = 0;
1092
1093         if (*toget && !resp->records)
1094         {
1095             oident *prefformat;
1096             oid_value form;
1097
1098             if (!(prefformat = oid_getentbyoid(req->preferredRecordSyntax)))
1099                 form = VAL_NONE;
1100             else
1101                 form = prefformat->value;
1102             resp->records = pack_records(assoc, req->resultSetName, 1,
1103                 toget, compp, next, presst, form, req->referenceId,
1104                                          req->preferredRecordSyntax);
1105             if (!resp->records)
1106                 return 0;
1107             resp->numberOfRecordsReturned = toget;
1108             resp->nextResultSetPosition = next;
1109             resp->searchStatus = sr;
1110             resp->resultSetStatus = 0;
1111             resp->presentStatus = presst;
1112         }
1113         else
1114         {
1115             if (*resp->resultCount)
1116                 *next = 1;
1117             resp->numberOfRecordsReturned = nulint;
1118             resp->nextResultSetPosition = next;
1119             resp->searchStatus = sr;
1120             resp->resultSetStatus = 0;
1121             resp->presentStatus = 0;
1122         }
1123     }
1124     return apdu;
1125 }
1126
1127 /*
1128  * Maybe we got a little over-friendly when we designed bend_fetch to
1129  * get only one record at a time. Some backends can optimise multiple-record
1130  * fetches, and at any rate, there is some overhead involved in
1131  * all that selecting and hopping around. Problem is, of course, that the
1132  * frontend can't know ahead of time how many records it'll need to
1133  * fill the negotiated PDU size. Annoying. Segmentation or not, Z/SR
1134  * is downright lousy as a bulk data transfer protocol.
1135  *
1136  * To start with, we'll do the fetching of records from the backend
1137  * in one operation: To save some trips in and out of the event-handler,
1138  * and to simplify the interface to pack_records. At any rate, asynch
1139  * operation is more fun in operations that have an unpredictable execution
1140  * speed - which is normally more true for search than for present.
1141  */
1142 static Z_APDU *process_presentRequest(association *assoc, request *reqb,
1143                                       int *fd)
1144 {
1145     Z_PresentRequest *req = reqb->apdu_request->u.presentRequest;
1146     oident *prefformat;
1147     oid_value form;
1148     Z_APDU *apdu;
1149     Z_PresentResponse *resp;
1150     int *next;
1151     int *num;
1152
1153     yaz_log(LOG_LOG, "Got PresentRequest.");
1154
1155     if (!(prefformat = oid_getentbyoid(req->preferredRecordSyntax)))
1156         form = VAL_NONE;
1157     else
1158         form = prefformat->value;
1159     resp = (Z_PresentResponse *)odr_malloc (assoc->encode, sizeof(*resp));
1160     resp->records = 0;
1161     resp->presentStatus = odr_intdup(assoc->encode, 0);
1162     if (assoc->init->bend_present)
1163     {
1164         bend_present_rr *bprr = (bend_present_rr *)
1165             nmem_malloc (reqb->request_mem, sizeof(*bprr));
1166         bprr->setname = req->resultSetId;
1167         bprr->start = *req->resultSetStartPoint;
1168         bprr->number = *req->numberOfRecordsRequested;
1169         bprr->format = form;
1170         bprr->comp = req->recordComposition;
1171         bprr->referenceId = req->referenceId;
1172         bprr->stream = assoc->encode;
1173         bprr->print = assoc->print;
1174         bprr->request = reqb;
1175         bprr->association = assoc;
1176         bprr->errcode = 0;
1177         bprr->errstring = NULL;
1178         (*assoc->init->bend_present)(assoc->backend, bprr);
1179
1180         if (!bprr->request)
1181             return 0;
1182         if (bprr->errcode)
1183         {
1184             resp->records = diagrec(assoc, bprr->errcode, bprr->errstring);
1185             *resp->presentStatus = Z_PRES_FAILURE;
1186         }
1187     }
1188     apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1189     next = odr_intdup(assoc->encode, 0);
1190     num = odr_intdup(assoc->encode, 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 (!resp->records)
1198     {
1199         *num = *req->numberOfRecordsRequested;
1200         resp->records =
1201             pack_records(assoc, req->resultSetId, *req->resultSetStartPoint,
1202                      num, req->recordComposition, next, resp->presentStatus,
1203                          form, req->referenceId, req->preferredRecordSyntax);
1204     }
1205     if (!resp->records)
1206         return 0;
1207     resp->numberOfRecordsReturned = num;
1208     resp->nextResultSetPosition = next;
1209
1210     return apdu;
1211 }
1212
1213 /*
1214  * Scan was implemented rather in a hurry, and with support for only the basic
1215  * elements of the service in the backend API. Suggestions are welcome.
1216  */
1217 static Z_APDU *process_scanRequest(association *assoc, request *reqb, int *fd)
1218 {
1219     Z_ScanRequest *req = reqb->apdu_request->u.scanRequest;
1220     Z_APDU *apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1221     Z_ScanResponse *res = (Z_ScanResponse *)
1222         odr_malloc (assoc->encode, sizeof(*res));
1223     int *scanStatus = odr_intdup(assoc->encode, Z_Scan_failure);
1224     int *numberOfEntriesReturned = odr_intdup(assoc->encode, 0);
1225     Z_ListEntries *ents = (Z_ListEntries *)
1226         odr_malloc (assoc->encode, sizeof(*ents));
1227     Z_DiagRecs *diagrecs_p = NULL;
1228     oident *attent;
1229     oident *attset;
1230     bend_scan_rr *bsrr = (bend_scan_rr *)
1231         odr_malloc (assoc->encode, sizeof(*bsrr));
1232
1233     yaz_log(LOG_LOG, "Got ScanRequest");
1234
1235     apdu->which = Z_APDU_scanResponse;
1236     apdu->u.scanResponse = res;
1237     res->referenceId = req->referenceId;
1238
1239     /* if step is absent, set it to 0 */
1240     res->stepSize = odr_intdup(assoc->encode, 0);
1241     if (req->stepSize)
1242         *res->stepSize = *req->stepSize;
1243
1244     res->scanStatus = scanStatus;
1245     res->numberOfEntriesReturned = numberOfEntriesReturned;
1246     res->positionOfTerm = 0;
1247     res->entries = ents;
1248     ents->num_entries = 0;
1249     ents->entries = NULL;
1250     ents->num_nonsurrogateDiagnostics = 0;
1251     ents->nonsurrogateDiagnostics = NULL;
1252     res->attributeSet = 0;
1253     res->otherInfo = 0;
1254
1255     if (req->databaseNames)
1256     {
1257         int i;
1258         for (i = 0; i < req->num_databaseNames; i++)
1259             yaz_log (LOG_LOG, "Database '%s'", req->databaseNames[i]);
1260     }
1261     bsrr->num_bases = req->num_databaseNames;
1262     bsrr->basenames = req->databaseNames;
1263     bsrr->num_entries = *req->numberOfTermsRequested;
1264     bsrr->term = req->termListAndStartPoint;
1265     bsrr->referenceId = req->referenceId;
1266     bsrr->stream = assoc->encode;
1267     bsrr->print = assoc->print;
1268     bsrr->step_size = res->stepSize;
1269     if (req->attributeSet &&
1270         (attset = oid_getentbyoid(req->attributeSet)) &&
1271         (attset->oclass == CLASS_ATTSET || attset->oclass == CLASS_GENERAL))
1272         bsrr->attributeset = attset->value;
1273     else
1274         bsrr->attributeset = VAL_NONE;
1275     log_scan_term (req->termListAndStartPoint, bsrr->attributeset);
1276     bsrr->term_position = req->preferredPositionInResponse ?
1277         *req->preferredPositionInResponse : 1;
1278     ((int (*)(void *, bend_scan_rr *))
1279      (*assoc->init->bend_scan))(assoc->backend, bsrr);
1280     if (bsrr->errcode)
1281         diagrecs_p = diagrecs(assoc, bsrr->errcode, bsrr->errstring);
1282     else
1283     {
1284         int i;
1285         Z_Entry **tab = (Z_Entry **)
1286             odr_malloc (assoc->encode, sizeof(*tab) * bsrr->num_entries);
1287
1288         if (bsrr->status == BEND_SCAN_PARTIAL)
1289             *scanStatus = Z_Scan_partial_5;
1290         else
1291             *scanStatus = Z_Scan_success;
1292         ents->entries = tab;
1293         ents->num_entries = bsrr->num_entries;
1294         res->numberOfEntriesReturned = &ents->num_entries;
1295         res->positionOfTerm = &bsrr->term_position;
1296         for (i = 0; i < bsrr->num_entries; i++)
1297         {
1298             Z_Entry *e;
1299             Z_TermInfo *t;
1300             Odr_oct *o;
1301
1302             tab[i] = e = (Z_Entry *)odr_malloc(assoc->encode, sizeof(*e));
1303             if (bsrr->entries[i].occurrences >= 0)
1304             {
1305                 e->which = Z_Entry_termInfo;
1306                 e->u.termInfo = t = (Z_TermInfo *)
1307                     odr_malloc(assoc->encode, sizeof(*t));
1308                 t->suggestedAttributes = 0;
1309                 t->displayTerm = 0;
1310                 t->alternativeTerm = 0;
1311                 t->byAttributes = 0;
1312                 t->otherTermInfo = 0;
1313                 t->globalOccurrences = &bsrr->entries[i].occurrences;
1314                 t->term = (Z_Term *)
1315                     odr_malloc(assoc->encode, sizeof(*t->term));
1316                 t->term->which = Z_Term_general;
1317                 t->term->u.general = o =
1318                     (Odr_oct *)odr_malloc(assoc->encode, sizeof(Odr_oct));
1319                 o->buf = (unsigned char *)
1320                     odr_malloc(assoc->encode, o->len = o->size =
1321                                strlen(bsrr->entries[i].term));
1322                 memcpy(o->buf, bsrr->entries[i].term, o->len);
1323                 yaz_log(LOG_DEBUG, "  term #%d: '%s' (%d)", i,
1324                          bsrr->entries[i].term, bsrr->entries[i].occurrences);
1325             }
1326             else
1327             {
1328                 Z_DiagRecs *drecs = diagrecs (assoc,
1329                                               bsrr->entries[i].errcode,
1330                                               bsrr->entries[i].errstring);
1331                 assert (drecs->num_diagRecs == 1);
1332                 e->which = Z_Entry_surrogateDiagnostic;
1333                 assert (drecs->diagRecs[0]);
1334                 e->u.surrogateDiagnostic = drecs->diagRecs[0];
1335             }
1336         }
1337     }
1338     if (diagrecs_p)
1339     {
1340         ents->num_nonsurrogateDiagnostics = diagrecs_p->num_diagRecs;
1341         ents->nonsurrogateDiagnostics = diagrecs_p->diagRecs;
1342     }
1343     return apdu;
1344 }
1345
1346 static Z_APDU *process_sortRequest(association *assoc, request *reqb,
1347     int *fd)
1348 {
1349     Z_SortRequest *req = reqb->apdu_request->u.sortRequest;
1350     Z_SortResponse *res = (Z_SortResponse *)
1351         odr_malloc (assoc->encode, sizeof(*res));
1352     bend_sort_rr *bsrr = (bend_sort_rr *)
1353         odr_malloc (assoc->encode, sizeof(*bsrr));
1354
1355     Z_APDU *apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1356
1357     yaz_log(LOG_LOG, "Got SortRequest.");
1358
1359     bsrr->num_input_setnames = req->num_inputResultSetNames;
1360     bsrr->input_setnames = req->inputResultSetNames;
1361     bsrr->referenceId = req->referenceId;
1362     bsrr->output_setname = req->sortedResultSetName;
1363     bsrr->sort_sequence = req->sortSequence;
1364     bsrr->stream = assoc->encode;
1365     bsrr->print = assoc->print;
1366
1367     bsrr->sort_status = Z_SortStatus_failure;
1368     bsrr->errcode = 0;
1369     bsrr->errstring = 0;
1370
1371     (*assoc->init->bend_sort)(assoc->backend, bsrr);
1372
1373     res->referenceId = bsrr->referenceId;
1374     res->sortStatus = odr_intdup(assoc->encode, bsrr->sort_status);
1375     res->resultSetStatus = 0;
1376     if (bsrr->errcode)
1377     {
1378         Z_DiagRecs *dr = diagrecs (assoc, bsrr->errcode, bsrr->errstring);
1379         res->diagnostics = dr->diagRecs;
1380         res->num_diagnostics = dr->num_diagRecs;
1381     }
1382     else
1383     {
1384         res->num_diagnostics = 0;
1385         res->diagnostics = 0;
1386     }
1387     res->otherInfo = 0;
1388
1389     apdu->which = Z_APDU_sortResponse;
1390     apdu->u.sortResponse = res;
1391     return apdu;
1392 }
1393
1394 static Z_APDU *process_deleteRequest(association *assoc, request *reqb,
1395     int *fd)
1396 {
1397     Z_DeleteResultSetRequest *req =
1398         reqb->apdu_request->u.deleteResultSetRequest;
1399     Z_DeleteResultSetResponse *res = (Z_DeleteResultSetResponse *)
1400         odr_malloc (assoc->encode, sizeof(*res));
1401     bend_delete_rr *bdrr = (bend_delete_rr *)
1402         odr_malloc (assoc->encode, sizeof(*bdrr));
1403     Z_APDU *apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1404
1405     yaz_log(LOG_LOG, "Got DeleteRequest.");
1406
1407     bdrr->num_setnames = req->num_resultSetList;
1408     bdrr->setnames = req->resultSetList;
1409     bdrr->stream = assoc->encode;
1410     bdrr->print = assoc->print;
1411     bdrr->function = *req->deleteFunction;
1412     bdrr->referenceId = req->referenceId;
1413     bdrr->statuses = 0;
1414     if (bdrr->num_setnames > 0)
1415     {
1416         int i;
1417         bdrr->statuses = (int*)
1418             odr_malloc(assoc->encode, sizeof(*bdrr->statuses) *
1419                        bdrr->num_setnames);
1420         for (i = 0; i < bdrr->num_setnames; i++)
1421             bdrr->statuses[i] = 0;
1422     }
1423     (*assoc->init->bend_delete)(assoc->backend, bdrr);
1424
1425     res->referenceId = req->referenceId;
1426
1427     res->deleteOperationStatus = odr_intdup(assoc->encode,bdrr->delete_status);
1428
1429     res->deleteListStatuses = 0;
1430     if (bdrr->num_setnames > 0)
1431     {
1432         int i;
1433         res->deleteListStatuses = (Z_ListStatuses *)
1434             odr_malloc(assoc->encode, sizeof(*res->deleteListStatuses));
1435         res->deleteListStatuses->num = bdrr->num_setnames;
1436         res->deleteListStatuses->elements =
1437             (Z_ListStatus **)
1438             odr_malloc (assoc->encode,
1439                         sizeof(*res->deleteListStatuses->elements) *
1440                         bdrr->num_setnames);
1441         for (i = 0; i<bdrr->num_setnames; i++)
1442         {
1443             res->deleteListStatuses->elements[i] =
1444                 (Z_ListStatus *)
1445                 odr_malloc (assoc->encode,
1446                             sizeof(**res->deleteListStatuses->elements));
1447             res->deleteListStatuses->elements[i]->status = bdrr->statuses+i;
1448             res->deleteListStatuses->elements[i]->id =
1449                 odr_strdup (assoc->encode, bdrr->setnames[i]);
1450
1451         }
1452     }
1453     res->numberNotDeleted = 0;
1454     res->bulkStatuses = 0;
1455     res->deleteMessage = 0;
1456     res->otherInfo = 0;
1457
1458     apdu->which = Z_APDU_deleteResultSetResponse;
1459     apdu->u.deleteResultSetResponse = res;
1460     return apdu;
1461 }
1462
1463 static void process_close(association *assoc, request *reqb)
1464 {
1465     Z_Close *req = reqb->apdu_request->u.close;
1466     static char *reasons[] =
1467     {
1468         "finished",
1469         "shutdown",
1470         "systemProblem",
1471         "costLimit",
1472         "resources",
1473         "securityViolation",
1474         "protocolError",
1475         "lackOfActivity",
1476         "peerAbort",
1477         "unspecified"
1478     };
1479
1480     yaz_log(LOG_LOG, "Got Close, reason %s, message %s",
1481         reasons[*req->closeReason], req->diagnosticInformation ?
1482         req->diagnosticInformation : "NULL");
1483     if (assoc->version < 3) /* to make do_force respond with close */
1484         assoc->version = 3;
1485     do_close_req(assoc, Z_Close_finished,
1486                  "Association terminated by client", reqb);
1487 }
1488
1489 void save_referenceId (request *reqb, Z_ReferenceId *refid)
1490 {
1491     if (refid)
1492     {
1493         reqb->len_refid = refid->len;
1494         reqb->refid = (char *)nmem_malloc (reqb->request_mem, refid->len);
1495         memcpy (reqb->refid, refid->buf, refid->len);
1496     }
1497     else
1498     {
1499         reqb->len_refid = 0;
1500         reqb->refid = NULL;
1501     }
1502 }
1503
1504 void bend_request_send (bend_association a, bend_request req, Z_APDU *res)
1505 {
1506     process_response (a, req, res);
1507 }
1508
1509 bend_request bend_request_mk (bend_association a)
1510 {
1511     request *nreq = request_get (&a->outgoing);
1512     nreq->request_mem = nmem_create ();
1513     return nreq;
1514 }
1515
1516 Z_ReferenceId *bend_request_getid (ODR odr, bend_request req)
1517 {
1518     Z_ReferenceId *id;
1519     if (!req->refid)
1520         return 0;
1521     id = (Odr_oct *)odr_malloc (odr, sizeof(*odr));
1522     id->buf = (unsigned char *)odr_malloc (odr, req->len_refid);
1523     id->len = id->size = req->len_refid;
1524     memcpy (id->buf, req->refid, req->len_refid);
1525     return id;
1526 }
1527
1528 void bend_request_destroy (bend_request *req)
1529 {
1530     nmem_destroy((*req)->request_mem);
1531     request_release(*req);
1532     *req = NULL;
1533 }
1534
1535 int bend_backend_respond (bend_association a, bend_request req)
1536 {
1537     char *msg;
1538     int r;
1539     r = process_request (a, req, &msg);
1540     if (r < 0)
1541         logf (LOG_WARN, "%s", msg);
1542     return r;
1543 }
1544
1545 void bend_request_setdata(bend_request r, void *p)
1546 {
1547     r->clientData = p;
1548 }
1549
1550 void *bend_request_getdata(bend_request r)
1551 {
1552     return r->clientData;
1553 }
1554
1555 static Z_APDU *process_segmentRequest (association *assoc, request *reqb)
1556 {
1557     bend_segment_rr request;
1558
1559     request.segment = reqb->apdu_request->u.segmentRequest;
1560     request.stream = assoc->encode;
1561     request.decode = assoc->decode;
1562     request.print = assoc->print;
1563     request.association = assoc;
1564
1565     (*assoc->init->bend_segment)(assoc->backend, &request);
1566
1567     return 0;
1568 }
1569
1570 static Z_APDU *process_ESRequest(association *assoc, request *reqb, int *fd)
1571 {
1572     bend_esrequest_rr esrequest;
1573
1574     Z_ExtendedServicesRequest *req = reqb->apdu_request->u.extendedServicesRequest;
1575     Z_APDU *apdu = zget_APDU(assoc->encode, Z_APDU_extendedServicesResponse);
1576
1577     Z_ExtendedServicesResponse *resp = apdu->u.extendedServicesResponse;
1578
1579     yaz_log(LOG_DEBUG,"inside Process esRequest");
1580
1581     esrequest.esr = reqb->apdu_request->u.extendedServicesRequest;
1582     esrequest.stream = assoc->encode;
1583     esrequest.decode = assoc->decode;
1584     esrequest.print = assoc->print;
1585     esrequest.errcode = 0;
1586     esrequest.errstring = NULL;
1587     esrequest.request = reqb;
1588     esrequest.association = assoc;
1589     esrequest.taskPackage = 0;
1590     esrequest.referenceId = req->referenceId;
1591
1592     (*assoc->init->bend_esrequest)(assoc->backend, &esrequest);
1593
1594     /* If the response is being delayed, return NULL */
1595     if (esrequest.request == NULL)
1596         return(NULL);
1597
1598     resp->referenceId = req->referenceId;
1599
1600     if (esrequest.errcode == -1)
1601     {
1602         /* Backend service indicates request will be processed */
1603         yaz_log(LOG_DEBUG,"Request could be processed...Accepted !");
1604         *resp->operationStatus = Z_ExtendedServicesResponse_accepted;
1605     }
1606     else if (esrequest.errcode == 0)
1607     {
1608         /* Backend service indicates request will be processed */
1609         yaz_log(LOG_DEBUG,"Request could be processed...Done !");
1610         *resp->operationStatus = Z_ExtendedServicesResponse_done;
1611     }
1612     else
1613     {
1614         Z_DiagRecs *diagRecs = diagrecs (assoc, esrequest.errcode,
1615                                          esrequest.errstring);
1616
1617         /* Backend indicates error, request will not be processed */
1618         yaz_log(LOG_DEBUG,"Request could not be processed...failure !");
1619         *resp->operationStatus = Z_ExtendedServicesResponse_failure;
1620         resp->num_diagnostics = diagRecs->num_diagRecs;
1621         resp->diagnostics = diagRecs->diagRecs;
1622     }
1623     /* Do something with the members of bend_extendedservice */
1624     if (esrequest.taskPackage)
1625         resp->taskPackage = z_ext_record (assoc->encode, VAL_EXTENDED,
1626                                          (const char *)  esrequest.taskPackage,
1627                                           -1);
1628     yaz_log(LOG_DEBUG,"Send the result apdu");
1629     return apdu;
1630 }