server/seshigh.c

   1 /*
   2  * Copyright (c) 1995-2002, Index Data
   3  * See the file LICENSE for details.
   4  *
   5  * $Id: seshigh.c,v 1.131 2002-07-25 12:52:54 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 #include <yaz/diagbib1.h>
  49 #include <yaz/charneg.h>
  50 #include <yaz/otherinfo.h>
  51
  52 #include <yaz/backend.h>
  53
  54 static int process_request(association *assoc, request *req, char **msg);
  55 void backend_response(IOCHAN i, int event);
  56 static int process_response(association *assoc, request *req, Z_APDU *res);
  57 static Z_APDU *process_initRequest(association *assoc, request *reqb);
  58 static Z_APDU *process_searchRequest(association *assoc, request *reqb,
  59     int *fd);
  60 static Z_APDU *response_searchRequest(association *assoc, request *reqb,
  61     bend_search_rr *bsrr, int *fd);
  62 static Z_APDU *process_presentRequest(association *assoc, request *reqb,
  63     int *fd);
  64 static Z_APDU *process_scanRequest(association *assoc, request *reqb, int *fd);
  65 static Z_APDU *process_sortRequest(association *assoc, request *reqb, int *fd);
  66 static void process_close(association *assoc, request *reqb);
  67 void save_referenceId (request *reqb, Z_ReferenceId *refid);
  68 static Z_APDU *process_deleteRequest(association *assoc, request *reqb,
  69     int *fd);
  70 static Z_APDU *process_segmentRequest (association *assoc, request *reqb);
  71
  72 static FILE *apduf = 0; /* for use in static mode */
  73 static statserv_options_block *control_block = 0;
  74
  75 /* Chas: Added in from DALI */
  76 static Z_APDU *process_ESRequest(association *assoc, request *reqb, int *fd);
  77 /* Chas: End of addition from DALI */
  78
  79 /*
  80  * Create and initialize a new association-handle.
  81  *  channel  : iochannel for the current line.
  82  *  link     : communications channel.
  83  * Returns: 0 or a new association handle.
  84  */
  85 association *create_association(IOCHAN channel, COMSTACK link)
  86 {
  87     association *anew;
  88
  89     if (!control_block)
  90         control_block = statserv_getcontrol();
  91     if (!(anew = (association *)xmalloc(sizeof(*anew))))
  92         return 0;
  93     anew->init = 0;
  94     anew->client_chan = channel;
  95     anew->client_link = link;
  96     anew->cs_get_mask = 0;
  97     anew->cs_put_mask = 0;
  98     anew->cs_accept_mask = 0;
  99     if (!(anew->decode = odr_createmem(ODR_DECODE)) ||
 100         !(anew->encode = odr_createmem(ODR_ENCODE)))
 101         return 0;
 102     if (*control_block->apdufile)
 103     {
 104         char filename[256];
 105         FILE *f;
 106
 107         strcpy(filename, control_block->apdufile);
 108         if (!(anew->print = odr_createmem(ODR_PRINT)))
 109             return 0;
 110         if (*control_block->apdufile != '-')
 111         {
 112             strcpy(filename, control_block->apdufile);
 113             if (!control_block->dynamic)
 114             {
 115                 if (!apduf)
 116                 {
 117                     if (!(apduf = fopen(filename, "w")))
 118                     {
 119                         yaz_log(LOG_WARN|LOG_ERRNO, "%s", filename);
 120                         return 0;
 121                     }
 122                     setvbuf(apduf, 0, _IONBF, 0);
 123                 }
 124                 f = apduf;
 125             }
 126             else
 127             {
 128                 sprintf(filename + strlen(filename), ".%d", getpid());
 129                 if (!(f = fopen(filename, "w")))
 130                 {
 131                     yaz_log(LOG_WARN|LOG_ERRNO, "%s", filename);
 132                     return 0;
 133                 }
 134                 setvbuf(f, 0, _IONBF, 0);
 135             }
 136             odr_setprint(anew->print, f);
 137         }
 138     }
 139     else
 140         anew->print = 0;
 141     anew->input_buffer = 0;
 142     anew->input_buffer_len = 0;
 143     anew->backend = 0;
 144     anew->state = ASSOC_NEW;
 145     request_initq(&anew->incoming);
 146     request_initq(&anew->outgoing);
 147     anew->proto = cs_getproto(link);
 148     return anew;
 149 }
 150
 151 /*
 152  * Free association and release resources.
 153  */
 154 void destroy_association(association *h)
 155 {
 156     statserv_options_block *cb = statserv_getcontrol();
 157
 158     xfree(h->init);
 159     odr_destroy(h->decode);
 160     odr_destroy(h->encode);
 161     if (h->print)
 162         odr_destroy(h->print);
 163     if (h->input_buffer)
 164     xfree(h->input_buffer);
 165     if (h->backend)
 166         (*cb->bend_close)(h->backend);
 167     while (request_deq(&h->incoming));
 168     while (request_deq(&h->outgoing));
 169     request_delq(&h->incoming);
 170     request_delq(&h->outgoing);
 171     xfree(h);
 172     xmalloc_trav("session closed");
 173     if (control_block && control_block->one_shot)
 174         exit (0);
 175 }
 176
 177 static void do_close_req(association *a, int reason, char *message,
 178                          request *req)
 179 {
 180     Z_APDU apdu;
 181     Z_Close *cls = zget_Close(a->encode);
 182
 183     /* Purge request queue */
 184     while (request_deq(&a->incoming));
 185     while (request_deq(&a->outgoing));
 186     if (a->version >= 3)
 187     {
 188         yaz_log(LOG_LOG, "Sending Close PDU, reason=%d, message=%s",
 189             reason, message ? message : "none");
 190         apdu.which = Z_APDU_close;
 191         apdu.u.close = cls;
 192         *cls->closeReason = reason;
 193         cls->diagnosticInformation = message;
 194         process_response(a, req, &apdu);
 195         iochan_settimeout(a->client_chan, 60);
 196     }
 197     else
 198     {
 199         yaz_log(LOG_DEBUG, "v2 client. No Close PDU");
 200         iochan_setevent(a->client_chan, EVENT_TIMEOUT); /* force imm close */
 201     }
 202     a->state = ASSOC_DEAD;
 203 }
 204
 205 static void do_close(association *a, int reason, char *message)
 206 {
 207     do_close_req (a, reason, message, request_get(&a->outgoing));
 208 }
 209
 210 /*
 211  * This is where PDUs from the client are read and the further
 212  * processing is initiated. Flow of control moves down through the
 213  * various process_* functions below, until the encoded result comes back up
 214  * to the output handler in here.
 215  *
 216  *  h     : the I/O channel that has an outstanding event.
 217  *  event : the current outstanding event.
 218  */
 219 void ir_session(IOCHAN h, int event)
 220 {
 221     int res;
 222     association *assoc = (association *)iochan_getdata(h);
 223     COMSTACK conn = assoc->client_link;
 224     request *req;
 225
 226     assert(h && conn && assoc);
 227     if (event == EVENT_TIMEOUT)
 228     {
 229         if (assoc->state != ASSOC_UP)
 230         {
 231             yaz_log(LOG_LOG, "Final timeout - closing connection.");
 232             cs_close(conn);
 233             destroy_association(assoc);
 234             iochan_destroy(h);
 235         }
 236         else
 237         {
 238             yaz_log(LOG_LOG, "Session idle too long. Sending close.");
 239             do_close(assoc, Z_Close_lackOfActivity, 0);
 240         }
 241         return;
 242     }
 243     if (event & assoc->cs_accept_mask)
 244     {
 245         yaz_log (LOG_DEBUG, "ir_session (accept)");
 246         if (!cs_accept (conn))
 247         {
 248             yaz_log (LOG_LOG, "accept failed");
 249             destroy_association(assoc);
 250             iochan_destroy(h);
 251         }
 252         iochan_clearflag (h, EVENT_OUTPUT|EVENT_OUTPUT);
 253         if (conn->io_pending)
 254         {   /* cs_accept didn't complete */
 255             assoc->cs_accept_mask =
 256                 ((conn->io_pending & CS_WANT_WRITE) ? EVENT_OUTPUT : 0) |
 257                 ((conn->io_pending & CS_WANT_READ) ? EVENT_INPUT : 0);
 258
 259             iochan_setflag (h, assoc->cs_accept_mask);
 260         }
 261         else
 262         {   /* cs_accept completed. Prepare for reading (cs_get) */
 263             assoc->cs_accept_mask = 0;
 264             assoc->cs_get_mask = EVENT_INPUT;
 265             iochan_setflag (h, assoc->cs_get_mask);
 266         }
 267         return;
 268     }
 269     if ((event & assoc->cs_get_mask) || (event & EVENT_WORK)) /* input */
 270     {
 271         if ((assoc->cs_put_mask & EVENT_INPUT) == 0 && (event & assoc->cs_get_mask))
 272         {
 273             yaz_log(LOG_DEBUG, "ir_session (input)");
 274             /* We aren't speaking to this fellow */
 275             if (assoc->state == ASSOC_DEAD)
 276             {
 277                 yaz_log(LOG_LOG, "Closed connection after reject");
 278                 cs_close(conn);
 279                 destroy_association(assoc);
 280                 iochan_destroy(h);
 281                 return;
 282             }
 283             assoc->cs_get_mask = EVENT_INPUT;
 284             if ((res = cs_get(conn, &assoc->input_buffer,
 285                 &assoc->input_buffer_len)) <= 0)
 286             {
 287                 yaz_log(LOG_LOG, "Connection closed by client");
 288                 cs_close(conn);
 289                 destroy_association(assoc);
 290                 iochan_destroy(h);
 291                 return;
 292             }
 293             else if (res == 1) /* incomplete read - wait for more  */
 294             {
 295                 if (conn->io_pending & CS_WANT_WRITE)
 296                     assoc->cs_get_mask |= EVENT_OUTPUT;
 297                 iochan_setflag(h, assoc->cs_get_mask);
 298                 return;
 299             }
 300             if (cs_more(conn)) /* more stuff - call us again later, please */
 301                 iochan_setevent(h, EVENT_INPUT);
 302
 303             /* we got a complete PDU. Let's decode it */
 304             yaz_log(LOG_DEBUG, "Got PDU, %d bytes", res);
 305             req = request_get(&assoc->incoming); /* get a new request structure */
 306             odr_reset(assoc->decode);
 307             odr_setbuf(assoc->decode, assoc->input_buffer, res, 0);
 308             if (!z_APDU(assoc->decode, &req->apdu_request, 0, 0))
 309             {
 310                 yaz_log(LOG_LOG, "ODR error on incoming PDU: %s [near byte %d] ",
 311                         odr_errmsg(odr_geterror(assoc->decode)),
 312                         odr_offset(assoc->decode));
 313                 yaz_log(LOG_LOG, "PDU dump:");
 314                 odr_dumpBER(yaz_log_file(), assoc->input_buffer, res);
 315                 do_close(assoc, Z_Close_protocolError, "Malformed package");
 316                 return;
 317             }
 318             req->request_mem = odr_extract_mem(assoc->decode);
 319             if (assoc->print && !z_APDU(assoc->print, &req->apdu_request, 0, 0))
 320             {
 321                 yaz_log(LOG_WARN, "ODR print error: %s",
 322                     odr_errmsg(odr_geterror(assoc->print)));
 323                 odr_reset(assoc->print);
 324             }
 325             request_enq(&assoc->incoming, req);
 326         }
 327
 328         /* can we do something yet? */
 329         req = request_head(&assoc->incoming);
 330         if (req->state == REQUEST_IDLE)
 331         {
 332             char *msg;
 333             request_deq(&assoc->incoming);
 334             if (process_request(assoc, req, &msg) < 0)
 335                 do_close_req(assoc, Z_Close_systemProblem, msg, req);
 336         }
 337     }
 338     if (event & assoc->cs_put_mask)
 339     {
 340         request *req = request_head(&assoc->outgoing);
 341
 342         assoc->cs_put_mask = 0;
 343         yaz_log(LOG_DEBUG, "ir_session (output)");
 344         req->state = REQUEST_PENDING;
 345         switch (res = cs_put(conn, req->response, req->len_response))
 346         {
 347         case -1:
 348             yaz_log(LOG_LOG, "Connection closed by client");
 349             cs_close(conn);
 350             destroy_association(assoc);
 351             iochan_destroy(h);
 352             break;
 353         case 0: /* all sent - release the request structure */
 354             yaz_log(LOG_DEBUG, "Wrote PDU, %d bytes", req->len_response);
 355             nmem_destroy(req->request_mem);
 356             request_deq(&assoc->outgoing);
 357             request_release(req);
 358             if (!request_head(&assoc->outgoing))
 359             {   /* restore mask for cs_get operation ... */
 360                 iochan_clearflag(h, EVENT_OUTPUT|EVENT_INPUT);
 361                 iochan_setflag(h, assoc->cs_get_mask);
 362             }
 363             else
 364                 assoc->cs_put_mask = EVENT_OUTPUT;
 365             break;
 366         default:
 367             if (conn->io_pending & CS_WANT_WRITE)
 368                 assoc->cs_put_mask |= EVENT_OUTPUT;
 369             if (conn->io_pending & CS_WANT_READ)
 370                 assoc->cs_put_mask |= EVENT_INPUT;
 371             iochan_setflag(h, assoc->cs_put_mask);
 372         }
 373     }
 374     if (event & EVENT_EXCEPT)
 375     {
 376         yaz_log(LOG_LOG, "ir_session (exception)");
 377         cs_close(conn);
 378         destroy_association(assoc);
 379         iochan_destroy(h);
 380     }
 381 }
 382
 383 /*
 384  * Initiate request processing.
 385  */
 386 static int process_request(association *assoc, request *req, char **msg)
 387 {
 388     int fd = -1;
 389     Z_APDU *res;
 390     int retval;
 391
 392     *msg = "Unknown Error";
 393     assert(req && req->state == REQUEST_IDLE);
 394     if (req->apdu_request->which != Z_APDU_initRequest && !assoc->init)
 395     {
 396         *msg = "Missing InitRequest";
 397         return -1;
 398     }
 399     switch (req->apdu_request->which)
 400     {
 401     case Z_APDU_initRequest:
 402         res = process_initRequest(assoc, req); break;
 403     case Z_APDU_searchRequest:
 404         res = process_searchRequest(assoc, req, &fd); break;
 405     case Z_APDU_presentRequest:
 406         res = process_presentRequest(assoc, req, &fd); break;
 407     case Z_APDU_scanRequest:
 408         if (assoc->init->bend_scan)
 409             res = process_scanRequest(assoc, req, &fd);
 410         else
 411         {
 412             *msg = "Cannot handle Scan APDU";
 413             return -1;
 414         }
 415         break;
 416     case Z_APDU_extendedServicesRequest:
 417         if (assoc->init->bend_esrequest)
 418             res = process_ESRequest(assoc, req, &fd);
 419         else
 420         {
 421             *msg = "Cannot handle Extended Services APDU";
 422             return -1;
 423         }
 424         break;
 425     case Z_APDU_sortRequest:
 426         if (assoc->init->bend_sort)
 427             res = process_sortRequest(assoc, req, &fd);
 428         else
 429         {
 430             *msg = "Cannot handle Sort APDU";
 431             return -1;
 432         }
 433         break;
 434     case Z_APDU_close:
 435         process_close(assoc, req);
 436         return 0;
 437     case Z_APDU_deleteResultSetRequest:
 438         if (assoc->init->bend_delete)
 439             res = process_deleteRequest(assoc, req, &fd);
 440         else
 441         {
 442             *msg = "Cannot handle Delete APDU";
 443             return -1;
 444         }
 445         break;
 446     case Z_APDU_segmentRequest:
 447         if (assoc->init->bend_segment)
 448         {
 449             res = process_segmentRequest (assoc, req);
 450         }
 451         else
 452         {
 453             *msg = "Cannot handle Segment APDU";
 454             return -1;
 455         }
 456         break;
 457     default:
 458         *msg = "Bad APDU received";
 459         return -1;
 460     }
 461     if (res)
 462     {
 463         yaz_log(LOG_DEBUG, "  result immediately available");
 464         retval = process_response(assoc, req, res);
 465     }
 466     else if (fd < 0)
 467     {
 468         yaz_log(LOG_DEBUG, "  result unavailble");
 469         retval = 0;
 470     }
 471     else /* no result yet - one will be provided later */
 472     {
 473         IOCHAN chan;
 474
 475         /* Set up an I/O handler for the fd supplied by the backend */
 476
 477         yaz_log(LOG_DEBUG, "   establishing handler for result");
 478         req->state = REQUEST_PENDING;
 479         if (!(chan = iochan_create(fd, backend_response, EVENT_INPUT)))
 480             abort();
 481         iochan_setdata(chan, assoc);
 482         retval = 0;
 483     }
 484     return retval;
 485 }
 486
 487 /*
 488  * Handle message from the backend.
 489  */
 490 void backend_response(IOCHAN i, int event)
 491 {
 492     association *assoc = (association *)iochan_getdata(i);
 493     request *req = request_head(&assoc->incoming);
 494     Z_APDU *res;
 495     int fd;
 496
 497     yaz_log(LOG_DEBUG, "backend_response");
 498     assert(assoc && req && req->state != REQUEST_IDLE);
 499     /* determine what it is we're waiting for */
 500     switch (req->apdu_request->which)
 501     {
 502         case Z_APDU_searchRequest:
 503             res = response_searchRequest(assoc, req, 0, &fd); break;
 504 #if 0
 505         case Z_APDU_presentRequest:
 506             res = response_presentRequest(assoc, req, 0, &fd); break;
 507         case Z_APDU_scanRequest:
 508             res = response_scanRequest(assoc, req, 0, &fd); break;
 509 #endif
 510         default:
 511             yaz_log(LOG_WARN, "Serious programmer's lapse or bug");
 512             abort();
 513     }
 514     if ((res && process_response(assoc, req, res) < 0) || fd < 0)
 515     {
 516         yaz_log(LOG_LOG, "Fatal error when talking to backend");
 517         do_close(assoc, Z_Close_systemProblem, 0);
 518         iochan_destroy(i);
 519         return;
 520     }
 521     else if (!res) /* no result yet - try again later */
 522     {
 523         yaz_log(LOG_DEBUG, "   no result yet");
 524         iochan_setfd(i, fd); /* in case fd has changed */
 525     }
 526 }
 527
 528 /*
 529  * Encode response, and transfer the request structure to the outgoing queue.
 530  */
 531 static int process_response(association *assoc, request *req, Z_APDU *res)
 532 {
 533     odr_setbuf(assoc->encode, req->response, req->size_response, 1);
 534
 535     if (assoc->print && !z_APDU(assoc->print, &res, 0, 0))
 536     {
 537         yaz_log(LOG_WARN, "ODR print error: %s",
 538             odr_errmsg(odr_geterror(assoc->print)));
 539         odr_reset(assoc->print);
 540     }
 541     if (!z_APDU(assoc->encode, &res, 0, 0))
 542     {
 543         yaz_log(LOG_WARN, "ODR error when encoding response: %s",
 544             odr_errmsg(odr_geterror(assoc->decode)));
 545         return -1;
 546     }
 547     req->response = odr_getbuf(assoc->encode, &req->len_response,
 548         &req->size_response);
 549     odr_setbuf(assoc->encode, 0, 0, 0); /* don'txfree if we abort later */
 550     odr_reset(assoc->encode);
 551     req->state = REQUEST_IDLE;
 552     request_enq(&assoc->outgoing, req);
 553     /* turn the work over to the ir_session handler */
 554     iochan_setflag(assoc->client_chan, EVENT_OUTPUT);
 555     assoc->cs_put_mask = EVENT_OUTPUT;
 556     /* Is there more work to be done? give that to the input handler too */
 557 #if 1
 558     if (request_head(&assoc->incoming))
 559     {
 560         yaz_log (LOG_DEBUG, "more work to be done");
 561         iochan_setevent(assoc->client_chan, EVENT_WORK);
 562     }
 563 #endif
 564     return 0;
 565 }
 566
 567 /*
 568  * Handle init request.
 569  * At the moment, we don't check the options
 570  * anywhere else in the code - we just try not to do anything that would
 571  * break a naive client. We'll toss 'em into the association block when
 572  * we need them there.
 573  */
 574 static Z_APDU *process_initRequest(association *assoc, request *reqb)
 575 {
 576     statserv_options_block *cb = statserv_getcontrol();
 577     Z_InitRequest *req = reqb->apdu_request->u.initRequest;
 578     Z_APDU *apdu = zget_APDU(assoc->encode, Z_APDU_initResponse);
 579     Z_InitResponse *resp = apdu->u.initResponse;
 580     bend_initresult *binitres;
 581
 582     char options[140];
 583
 584     xfree (assoc->init);
 585     assoc->init = (bend_initrequest *) xmalloc (sizeof(*assoc->init));
 586
 587     yaz_log(LOG_LOG, "Got initRequest");
 588     if (req->implementationId)
 589         yaz_log(LOG_LOG, "Id:        %s", req->implementationId);
 590     if (req->implementationName)
 591         yaz_log(LOG_LOG, "Name:      %s", req->implementationName);
 592     if (req->implementationVersion)
 593         yaz_log(LOG_LOG, "Version:   %s", req->implementationVersion);
 594
 595     assoc->init->stream = assoc->encode;
 596     assoc->init->print = assoc->print;
 597     assoc->init->auth = req->idAuthentication;
 598     assoc->init->referenceId = req->referenceId;
 599     assoc->init->implementation_version = 0;
 600     assoc->init->implementation_id = 0;
 601     assoc->init->implementation_name = 0;
 602     assoc->init->bend_sort = NULL;
 603     assoc->init->bend_search = NULL;
 604     assoc->init->bend_present = NULL;
 605     assoc->init->bend_esrequest = NULL;
 606     assoc->init->bend_delete = NULL;
 607     assoc->init->bend_scan = NULL;
 608     assoc->init->bend_segment = NULL;
 609     assoc->init->bend_fetch = NULL;
 610     assoc->init->charneg_request = NULL;
 611     assoc->init->charneg_response = NULL;
 612     assoc->init->decode = assoc->decode;
 613
 614     if (ODR_MASK_GET(req->options, Z_Options_negotiationModel))
 615     {
 616         Z_CharSetandLanguageNegotiation *negotiation =
 617             yaz_get_charneg_record (req->otherInfo);
 618         if (negotiation->which == Z_CharSetandLanguageNegotiation_proposal)
 619             assoc->init->charneg_request = negotiation;
 620     }
 621
 622     assoc->init->peer_name =
 623         odr_strdup (assoc->encode, cs_addrstr(assoc->client_link));
 624     if (!(binitres = (*cb->bend_init)(assoc->init)))
 625     {
 626         yaz_log(LOG_WARN, "Bad response from backend.");
 627         return 0;
 628     }
 629
 630     assoc->backend = binitres->handle;
 631     if ((assoc->init->bend_sort))
 632         yaz_log (LOG_DEBUG, "Sort handler installed");
 633     if ((assoc->init->bend_search))
 634         yaz_log (LOG_DEBUG, "Search handler installed");
 635     if ((assoc->init->bend_present))
 636         yaz_log (LOG_DEBUG, "Present handler installed");
 637     if ((assoc->init->bend_esrequest))
 638         yaz_log (LOG_DEBUG, "ESRequest handler installed");
 639     if ((assoc->init->bend_delete))
 640         yaz_log (LOG_DEBUG, "Delete handler installed");
 641     if ((assoc->init->bend_scan))
 642         yaz_log (LOG_DEBUG, "Scan handler installed");
 643     if ((assoc->init->bend_segment))
 644         yaz_log (LOG_DEBUG, "Segment handler installed");
 645
 646     resp->referenceId = req->referenceId;
 647     *options = '\0';
 648     /* let's tell the client what we can do */
 649     if (ODR_MASK_GET(req->options, Z_Options_search))
 650     {
 651         ODR_MASK_SET(resp->options, Z_Options_search);
 652         strcat(options, "srch");
 653     }
 654     if (ODR_MASK_GET(req->options, Z_Options_present))
 655     {
 656         ODR_MASK_SET(resp->options, Z_Options_present);
 657         strcat(options, " prst");
 658     }
 659     if (ODR_MASK_GET(req->options, Z_Options_delSet) &&
 660         assoc->init->bend_delete)
 661     {
 662         ODR_MASK_SET(resp->options, Z_Options_delSet);
 663         strcat(options, " del");
 664     }
 665     if (ODR_MASK_GET(req->options, Z_Options_extendedServices) &&
 666         assoc->init->bend_esrequest)
 667     {
 668         ODR_MASK_SET(resp->options, Z_Options_extendedServices);
 669         strcat (options, " extendedServices");
 670     }
 671     if (ODR_MASK_GET(req->options, Z_Options_namedResultSets))
 672     {
 673         ODR_MASK_SET(resp->options, Z_Options_namedResultSets);
 674         strcat(options, " namedresults");
 675     }
 676     if (ODR_MASK_GET(req->options, Z_Options_scan) && assoc->init->bend_scan)
 677     {
 678         ODR_MASK_SET(resp->options, Z_Options_scan);
 679         strcat(options, " scan");
 680     }
 681     if (ODR_MASK_GET(req->options, Z_Options_concurrentOperations))
 682     {
 683         ODR_MASK_SET(resp->options, Z_Options_concurrentOperations);
 684         strcat(options, " concurrop");
 685     }
 686     if (ODR_MASK_GET(req->options, Z_Options_sort) && assoc->init->bend_sort)
 687     {
 688         ODR_MASK_SET(resp->options, Z_Options_sort);
 689         strcat(options, " sort");
 690     }
 691
 692     if (ODR_MASK_GET(req->options, Z_Options_negotiationModel)
 693         && assoc->init->charneg_response)
 694     {
 695         Z_OtherInformation **p;
 696         Z_OtherInformationUnit *p0;
 697
 698         yaz_oi_APDU(apdu, &p);
 699
 700         if ((p0=yaz_oi_update(p, assoc->encode, NULL, 0, 0))) {
 701             ODR_MASK_SET(resp->options, Z_Options_negotiationModel);
 702
 703             p0->which = Z_OtherInfo_externallyDefinedInfo;
 704             p0->information.externallyDefinedInfo =
 705                 assoc->init->charneg_response;
 706         }
 707         ODR_MASK_SET(resp->options, Z_Options_negotiationModel);
 708         strcat(options, " negotiation");
 709     }
 710
 711     if (ODR_MASK_GET(req->protocolVersion, Z_ProtocolVersion_1))
 712     {
 713         ODR_MASK_SET(resp->protocolVersion, Z_ProtocolVersion_1);
 714         assoc->version = 2; /* 1 & 2 are equivalent */
 715     }
 716     if (ODR_MASK_GET(req->protocolVersion, Z_ProtocolVersion_2))
 717     {
 718         ODR_MASK_SET(resp->protocolVersion, Z_ProtocolVersion_2);
 719         assoc->version = 2;
 720     }
 721     if (ODR_MASK_GET(req->protocolVersion, Z_ProtocolVersion_3))
 722     {
 723         ODR_MASK_SET(resp->protocolVersion, Z_ProtocolVersion_3);
 724         assoc->version = 3;
 725     }
 726
 727     yaz_log(LOG_LOG, "Negotiated to v%d: %s", assoc->version, options);
 728     assoc->maximumRecordSize = *req->maximumRecordSize;
 729     if (assoc->maximumRecordSize > control_block->maxrecordsize)
 730         assoc->maximumRecordSize = control_block->maxrecordsize;
 731     assoc->preferredMessageSize = *req->preferredMessageSize;
 732     if (assoc->preferredMessageSize > assoc->maximumRecordSize)
 733         assoc->preferredMessageSize = assoc->maximumRecordSize;
 734
 735 #if 0
 736     assoc->maximumRecordSize = 3000000;
 737     assoc->preferredMessageSize = 3000000;
 738 #endif
 739
 740     resp->preferredMessageSize = &assoc->preferredMessageSize;
 741     resp->maximumRecordSize = &assoc->maximumRecordSize;
 742
 743     resp->implementationName = "GFS/YAZ";
 744
 745     if (assoc->init->implementation_id)
 746     {
 747         char *nv = (char *)
 748             odr_malloc (assoc->encode,
 749                         strlen(assoc->init->implementation_id) + 10 +
 750                                strlen(resp->implementationId));
 751         sprintf (nv, "%s / %s",
 752                  resp->implementationId, assoc->init->implementation_id);
 753         resp->implementationId = nv;
 754     }
 755     if (assoc->init->implementation_name)
 756     {
 757         char *nv = (char *)
 758             odr_malloc (assoc->encode,
 759                         strlen(assoc->init->implementation_name) + 10 +
 760                                strlen(resp->implementationName));
 761         sprintf (nv, "%s / %s",
 762                  resp->implementationName, assoc->init->implementation_name);
 763         resp->implementationName = nv;
 764     }
 765     if (assoc->init->implementation_version)
 766     {
 767         char *nv = (char *)
 768             odr_malloc (assoc->encode,
 769                         strlen(assoc->init->implementation_version) + 10 +
 770                                strlen(resp->implementationVersion));
 771         sprintf (nv, "YAZ %s / %s",
 772                  resp->implementationVersion,
 773                  assoc->init->implementation_version);
 774         resp->implementationVersion = nv;
 775     }
 776
 777     if (binitres->errcode)
 778     {
 779         yaz_log(LOG_LOG, "Connection rejected by backend.");
 780         *resp->result = 0;
 781         assoc->state = ASSOC_DEAD;
 782     }
 783     else
 784         assoc->state = ASSOC_UP;
 785     return apdu;
 786 }
 787
 788 /*
 789  * These functions should be merged.
 790  */
 791
 792 static void set_addinfo (Z_DefaultDiagFormat *dr, char *addinfo, ODR odr)
 793 {
 794     dr->which = Z_DefaultDiagFormat_v2Addinfo;
 795     dr->u.v2Addinfo = odr_strdup (odr, addinfo ? addinfo : "");
 796 }
 797
 798 /*
 799  * nonsurrogate diagnostic record.
 800  */
 801 static Z_Records *diagrec(association *assoc, int error, char *addinfo)
 802 {
 803     Z_Records *rec = (Z_Records *)
 804         odr_malloc (assoc->encode, sizeof(*rec));
 805     int *err = odr_intdup(assoc->encode, error);
 806     Z_DiagRec *drec = (Z_DiagRec *)
 807         odr_malloc (assoc->encode, sizeof(*drec));
 808     Z_DefaultDiagFormat *dr = (Z_DefaultDiagFormat *)
 809         odr_malloc (assoc->encode, sizeof(*dr));
 810
 811     yaz_log(LOG_LOG, "[%d] %s %s%s", error, diagbib1_str(error),
 812         addinfo ? " -- " : "", addinfo ? addinfo : "");
 813     rec->which = Z_Records_NSD;
 814     rec->u.nonSurrogateDiagnostic = dr;
 815     dr->diagnosticSetId =
 816         yaz_oidval_to_z3950oid (assoc->encode, CLASS_DIAGSET, VAL_BIB1);
 817     dr->condition = err;
 818     set_addinfo (dr, addinfo, assoc->encode);
 819     return rec;
 820 }
 821
 822 /*
 823  * surrogate diagnostic.
 824  */
 825 static Z_NamePlusRecord *surrogatediagrec(association *assoc, char *dbname,
 826                                           int error, char *addinfo)
 827 {
 828     Z_NamePlusRecord *rec = (Z_NamePlusRecord *)
 829         odr_malloc (assoc->encode, sizeof(*rec));
 830     int *err = odr_intdup(assoc->encode, error);
 831     Z_DiagRec *drec = (Z_DiagRec *)odr_malloc (assoc->encode, sizeof(*drec));
 832     Z_DefaultDiagFormat *dr = (Z_DefaultDiagFormat *)
 833         odr_malloc (assoc->encode, sizeof(*dr));
 834
 835     yaz_log(LOG_DEBUG, "SurrogateDiagnotic: %d -- %s", error, addinfo);
 836     rec->databaseName = dbname;
 837     rec->which = Z_NamePlusRecord_surrogateDiagnostic;
 838     rec->u.surrogateDiagnostic = drec;
 839     drec->which = Z_DiagRec_defaultFormat;
 840     drec->u.defaultFormat = dr;
 841     dr->diagnosticSetId =
 842         yaz_oidval_to_z3950oid (assoc->encode, CLASS_DIAGSET, VAL_BIB1);
 843     dr->condition = err;
 844     set_addinfo (dr, addinfo, assoc->encode);
 845
 846     return rec;
 847 }
 848
 849 /*
 850  * multiple nonsurrogate diagnostics.
 851  */
 852 static Z_DiagRecs *diagrecs(association *assoc, int error, char *addinfo)
 853 {
 854     Z_DiagRecs *recs = (Z_DiagRecs *)odr_malloc (assoc->encode, sizeof(*recs));
 855     int *err = odr_intdup(assoc->encode, error);
 856     Z_DiagRec **recp = (Z_DiagRec **)odr_malloc (assoc->encode, sizeof(*recp));
 857     Z_DiagRec *drec = (Z_DiagRec *)odr_malloc (assoc->encode, sizeof(*drec));
 858     Z_DefaultDiagFormat *rec = (Z_DefaultDiagFormat *)
 859         odr_malloc (assoc->encode, sizeof(*rec));
 860
 861     yaz_log(LOG_DEBUG, "DiagRecs: %d -- %s", error, addinfo ? addinfo : "");
 862
 863     recs->num_diagRecs = 1;
 864     recs->diagRecs = recp;
 865     recp[0] = drec;
 866     drec->which = Z_DiagRec_defaultFormat;
 867     drec->u.defaultFormat = rec;
 868
 869     rec->diagnosticSetId =
 870         yaz_oidval_to_z3950oid (assoc->encode, CLASS_DIAGSET, VAL_BIB1);
 871     rec->condition = err;
 872
 873     rec->which = Z_DefaultDiagFormat_v2Addinfo;
 874     rec->u.v2Addinfo = odr_strdup (assoc->encode, addinfo ? addinfo : "");
 875     return recs;
 876 }
 877
 878 static Z_Records *pack_records(association *a, char *setname, int start,
 879                                int *num, Z_RecordComposition *comp,
 880                                int *next, int *pres, oid_value format,
 881                                Z_ReferenceId *referenceId,
 882                                int *oid)
 883 {
 884     int recno, total_length = 0, toget = *num, dumped_records = 0;
 885     Z_Records *records =
 886         (Z_Records *) odr_malloc (a->encode, sizeof(*records));
 887     Z_NamePlusRecordList *reclist =
 888         (Z_NamePlusRecordList *) odr_malloc (a->encode, sizeof(*reclist));
 889     Z_NamePlusRecord **list =
 890         (Z_NamePlusRecord **) odr_malloc (a->encode, sizeof(*list) * toget);
 891
 892     records->which = Z_Records_DBOSD;
 893     records->u.databaseOrSurDiagnostics = reclist;
 894     reclist->num_records = 0;
 895     reclist->records = list;
 896     *pres = Z_PRES_SUCCESS;
 897     *num = 0;
 898     *next = 0;
 899
 900     yaz_log(LOG_LOG, "Request to pack %d+%d+%s", start, toget, setname);
 901     yaz_log(LOG_DEBUG, "pms=%d, mrs=%d", a->preferredMessageSize,
 902         a->maximumRecordSize);
 903     for (recno = start; reclist->num_records < toget; recno++)
 904     {
 905         bend_fetch_rr freq;
 906         Z_NamePlusRecord *thisrec;
 907         int this_length = 0;
 908         /*
 909          * we get the number of bytes allocated on the stream before any
 910          * allocation done by the backend - this should give us a reasonable
 911          * idea of the total size of the data so far.
 912          */
 913         total_length = odr_total(a->encode) - dumped_records;
 914         freq.errcode = 0;
 915         freq.errstring = 0;
 916         freq.basename = 0;
 917         freq.len = 0;
 918         freq.record = 0;
 919         freq.last_in_set = 0;
 920         freq.setname = setname;
 921         freq.surrogate_flag = 0;
 922         freq.number = recno;
 923         freq.comp = comp;
 924         freq.request_format = format;
 925         freq.request_format_raw = oid;
 926         freq.output_format = format;
 927         freq.output_format_raw = 0;
 928         freq.stream = a->encode;
 929         freq.print = a->print;
 930         freq.surrogate_flag = 0;
 931         freq.referenceId = referenceId;
 932         (*a->init->bend_fetch)(a->backend, &freq);
 933         /* backend should be able to signal whether error is system-wide
 934            or only pertaining to current record */
 935         if (freq.errcode)
 936         {
 937             if (!freq.surrogate_flag)
 938             {
 939                 char s[20];
 940                 *pres = Z_PRES_FAILURE;
 941                 /* for 'present request out of range',
 942                    set addinfo to record position if not set */
 943                 if (freq.errcode == 13 && freq.errstring == 0)
 944                 {
 945                     sprintf (s, "%d", recno);
 946                     freq.errstring = s;
 947                 }
 948                 return diagrec(a, freq.errcode, freq.errstring);
 949             }
 950             reclist->records[reclist->num_records] =
 951                 surrogatediagrec(a, freq.basename, freq.errcode,
 952                                  freq.errstring);
 953             reclist->num_records++;
 954             *next = freq.last_in_set ? 0 : recno + 1;
 955             continue;
 956         }
 957         if (freq.len >= 0)
 958             this_length = freq.len;
 959         else
 960             this_length = odr_total(a->encode) - total_length;
 961         yaz_log(LOG_DEBUG, "  fetched record, len=%d, total=%d",
 962             this_length, total_length);
 963         if (this_length + total_length > a->preferredMessageSize)
 964         {
 965             /* record is small enough, really */
 966             if (this_length <= a->preferredMessageSize)
 967             {
 968                 yaz_log(LOG_DEBUG, "  Dropped last normal-sized record");
 969                 *pres = Z_PRES_PARTIAL_2;
 970                 break;
 971             }
 972             /* record can only be fetched by itself */
 973             if (this_length < a->maximumRecordSize)
 974             {
 975                 yaz_log(LOG_DEBUG, "  Record > prefmsgsz");
 976                 if (toget > 1)
 977                 {
 978                     yaz_log(LOG_DEBUG, "  Dropped it");
 979                     reclist->records[reclist->num_records] =
 980                          surrogatediagrec(a, freq.basename, 16, 0);
 981                     reclist->num_records++;
 982                     *next = freq.last_in_set ? 0 : recno + 1;
 983                     dumped_records += this_length;
 984                     continue;
 985                 }
 986             }
 987             else /* too big entirely */
 988             {
 989                 yaz_log(LOG_LOG, "Record > maxrcdsz this=%d max=%d", this_length, a->maximumRecordSize);
 990                 reclist->records[reclist->num_records] =
 991                     surrogatediagrec(a, freq.basename, 17, 0);
 992                 reclist->num_records++;
 993                 *next = freq.last_in_set ? 0 : recno + 1;
 994                 dumped_records += this_length;
 995                 continue;
 996             }
 997         }
 998
 999         if (!(thisrec = (Z_NamePlusRecord *)
1000               odr_malloc(a->encode, sizeof(*thisrec))))
1001             return 0;
1002         if (!(thisrec->databaseName = (char *)odr_malloc(a->encode,
1003             strlen(freq.basename) + 1)))
1004             return 0;
1005         strcpy(thisrec->databaseName, freq.basename);
1006         thisrec->which = Z_NamePlusRecord_databaseRecord;
1007
1008         if (freq.output_format_raw)
1009         {
1010             struct oident *ident = oid_getentbyoid(freq.output_format_raw);
1011             freq.output_format = ident->value;
1012         }
1013         thisrec->u.databaseRecord = z_ext_record(a->encode, freq.output_format,
1014                                                  freq.record, freq.len);
1015         if (!thisrec->u.databaseRecord)
1016             return 0;
1017         reclist->records[reclist->num_records] = thisrec;
1018         reclist->num_records++;
1019         *next = freq.last_in_set ? 0 : recno + 1;
1020     }
1021     *num = reclist->num_records;
1022     return records;
1023 }
1024
1025 static Z_APDU *process_searchRequest(association *assoc, request *reqb,
1026     int *fd)
1027 {
1028     Z_SearchRequest *req = reqb->apdu_request->u.searchRequest;
1029     bend_search_rr *bsrr =
1030         (bend_search_rr *)nmem_malloc (reqb->request_mem, sizeof(*bsrr));
1031
1032     yaz_log(LOG_LOG, "Got SearchRequest.");
1033     bsrr->fd = fd;
1034     bsrr->request = reqb;
1035     bsrr->association = assoc;
1036     bsrr->referenceId = req->referenceId;
1037     save_referenceId (reqb, bsrr->referenceId);
1038
1039     yaz_log (LOG_LOG, "ResultSet '%s'", req->resultSetName);
1040     if (req->databaseNames)
1041     {
1042         int i;
1043         for (i = 0; i < req->num_databaseNames; i++)
1044             yaz_log (LOG_LOG, "Database '%s'", req->databaseNames[i]);
1045     }
1046     switch (req->query->which)
1047     {
1048     case Z_Query_type_1: case Z_Query_type_101:
1049         log_rpn_query (req->query->u.type_1);
1050     }
1051     if (assoc->init->bend_search)
1052     {
1053         bsrr->setname = req->resultSetName;
1054         bsrr->replace_set = *req->replaceIndicator;
1055         bsrr->num_bases = req->num_databaseNames;
1056         bsrr->basenames = req->databaseNames;
1057         bsrr->query = req->query;
1058         bsrr->stream = assoc->encode;
1059         bsrr->decode = assoc->decode;
1060         bsrr->print = assoc->print;
1061         bsrr->errcode = 0;
1062         bsrr->hits = 0;
1063         bsrr->errstring = NULL;
1064         bsrr->search_info = NULL;
1065         (assoc->init->bend_search)(assoc->backend, bsrr);
1066         if (!bsrr->request)
1067             return 0;
1068     }
1069     return response_searchRequest(assoc, reqb, bsrr, fd);
1070 }
1071
1072 int bend_searchresponse(void *handle, bend_search_rr *bsrr) {return 0;}
1073
1074 /*
1075  * Prepare a searchresponse based on the backend results. We probably want
1076  * to look at making the fetching of records nonblocking as well, but
1077  * so far, we'll keep things simple.
1078  * If bsrt is null, that means we're called in response to a communications
1079  * event, and we'll have to get the response for ourselves.
1080  */
1081 static Z_APDU *response_searchRequest(association *assoc, request *reqb,
1082     bend_search_rr *bsrt, int *fd)
1083 {
1084     Z_SearchRequest *req = reqb->apdu_request->u.searchRequest;
1085     Z_APDU *apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1086     Z_SearchResponse *resp = (Z_SearchResponse *)
1087         odr_malloc (assoc->encode, sizeof(*resp));
1088     int *nulint = odr_intdup (assoc->encode, 0);
1089     bool_t *sr = odr_intdup(assoc->encode, 1);
1090     int *next = odr_intdup(assoc->encode, 0);
1091     int *none = odr_intdup(assoc->encode, Z_RES_NONE);
1092
1093     apdu->which = Z_APDU_searchResponse;
1094     apdu->u.searchResponse = resp;
1095     resp->referenceId = req->referenceId;
1096     resp->additionalSearchInfo = 0;
1097     resp->otherInfo = 0;
1098     *fd = -1;
1099     if (!bsrt && !bend_searchresponse(assoc->backend, bsrt))
1100     {
1101         yaz_log(LOG_FATAL, "Bad result from backend");
1102         return 0;
1103     }
1104     else if (bsrt->errcode)
1105     {
1106         resp->records = diagrec(assoc, bsrt->errcode, bsrt->errstring);
1107         resp->resultCount = nulint;
1108         resp->numberOfRecordsReturned = nulint;
1109         resp->nextResultSetPosition = nulint;
1110         resp->searchStatus = nulint;
1111         resp->resultSetStatus = none;
1112         resp->presentStatus = 0;
1113     }
1114     else
1115     {
1116         int *toget = odr_intdup(assoc->encode, 0);
1117         int *presst = odr_intdup(assoc->encode, 0);
1118         Z_RecordComposition comp, *compp = 0;
1119
1120         yaz_log (LOG_LOG, "resultCount: %d", bsrt->hits);
1121
1122         resp->records = 0;
1123         resp->resultCount = &bsrt->hits;
1124
1125         comp.which = Z_RecordComp_simple;
1126         /* how many records does the user agent want, then? */
1127         if (bsrt->hits <= *req->smallSetUpperBound)
1128         {
1129             *toget = bsrt->hits;
1130             if ((comp.u.simple = req->smallSetElementSetNames))
1131                 compp = &comp;
1132         }
1133         else if (bsrt->hits < *req->largeSetLowerBound)
1134         {
1135             *toget = *req->mediumSetPresentNumber;
1136             if (*toget > bsrt->hits)
1137                 *toget = bsrt->hits;
1138             if ((comp.u.simple = req->mediumSetElementSetNames))
1139                 compp = &comp;
1140         }
1141         else
1142             *toget = 0;
1143
1144         if (*toget && !resp->records)
1145         {
1146             oident *prefformat;
1147             oid_value form;
1148
1149             if (!(prefformat = oid_getentbyoid(req->preferredRecordSyntax)))
1150                 form = VAL_NONE;
1151             else
1152                 form = prefformat->value;
1153             resp->records = pack_records(assoc, req->resultSetName, 1,
1154                 toget, compp, next, presst, form, req->referenceId,
1155                                          req->preferredRecordSyntax);
1156             if (!resp->records)
1157                 return 0;
1158             resp->numberOfRecordsReturned = toget;
1159             resp->nextResultSetPosition = next;
1160             resp->searchStatus = sr;
1161             resp->resultSetStatus = 0;
1162             resp->presentStatus = presst;
1163         }
1164         else
1165         {
1166             if (*resp->resultCount)
1167                 *next = 1;
1168             resp->numberOfRecordsReturned = nulint;
1169             resp->nextResultSetPosition = next;
1170             resp->searchStatus = sr;
1171             resp->resultSetStatus = 0;
1172             resp->presentStatus = 0;
1173         }
1174     }
1175     resp->additionalSearchInfo = bsrt->search_info;
1176     return apdu;
1177 }
1178
1179 /*
1180  * Maybe we got a little over-friendly when we designed bend_fetch to
1181  * get only one record at a time. Some backends can optimise multiple-record
1182  * fetches, and at any rate, there is some overhead involved in
1183  * all that selecting and hopping around. Problem is, of course, that the
1184  * frontend can't know ahead of time how many records it'll need to
1185  * fill the negotiated PDU size. Annoying. Segmentation or not, Z/SR
1186  * is downright lousy as a bulk data transfer protocol.
1187  *
1188  * To start with, we'll do the fetching of records from the backend
1189  * in one operation: To save some trips in and out of the event-handler,
1190  * and to simplify the interface to pack_records. At any rate, asynch
1191  * operation is more fun in operations that have an unpredictable execution
1192  * speed - which is normally more true for search than for present.
1193  */
1194 static Z_APDU *process_presentRequest(association *assoc, request *reqb,
1195                                       int *fd)
1196 {
1197     Z_PresentRequest *req = reqb->apdu_request->u.presentRequest;
1198     oident *prefformat;
1199     oid_value form;
1200     Z_APDU *apdu;
1201     Z_PresentResponse *resp;
1202     int *next;
1203     int *num;
1204
1205     yaz_log(LOG_LOG, "Got PresentRequest.");
1206
1207     if (!(prefformat = oid_getentbyoid(req->preferredRecordSyntax)))
1208         form = VAL_NONE;
1209     else
1210         form = prefformat->value;
1211     resp = (Z_PresentResponse *)odr_malloc (assoc->encode, sizeof(*resp));
1212     resp->records = 0;
1213     resp->presentStatus = odr_intdup(assoc->encode, 0);
1214     if (assoc->init->bend_present)
1215     {
1216         bend_present_rr *bprr = (bend_present_rr *)
1217             nmem_malloc (reqb->request_mem, sizeof(*bprr));
1218         bprr->setname = req->resultSetId;
1219         bprr->start = *req->resultSetStartPoint;
1220         bprr->number = *req->numberOfRecordsRequested;
1221         bprr->format = form;
1222         bprr->comp = req->recordComposition;
1223         bprr->referenceId = req->referenceId;
1224         bprr->stream = assoc->encode;
1225         bprr->print = assoc->print;
1226         bprr->request = reqb;
1227         bprr->association = assoc;
1228         bprr->errcode = 0;
1229         bprr->errstring = NULL;
1230         (*assoc->init->bend_present)(assoc->backend, bprr);
1231
1232         if (!bprr->request)
1233             return 0;
1234         if (bprr->errcode)
1235         {
1236             resp->records = diagrec(assoc, bprr->errcode, bprr->errstring);
1237             *resp->presentStatus = Z_PRES_FAILURE;
1238         }
1239     }
1240     apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1241     next = odr_intdup(assoc->encode, 0);
1242     num = odr_intdup(assoc->encode, 0);
1243
1244     apdu->which = Z_APDU_presentResponse;
1245     apdu->u.presentResponse = resp;
1246     resp->referenceId = req->referenceId;
1247     resp->otherInfo = 0;
1248
1249     if (!resp->records)
1250     {
1251         *num = *req->numberOfRecordsRequested;
1252         resp->records =
1253             pack_records(assoc, req->resultSetId, *req->resultSetStartPoint,
1254                      num, req->recordComposition, next, resp->presentStatus,
1255                          form, req->referenceId, req->preferredRecordSyntax);
1256     }
1257     if (!resp->records)
1258         return 0;
1259     resp->numberOfRecordsReturned = num;
1260     resp->nextResultSetPosition = next;
1261
1262     return apdu;
1263 }
1264
1265 /*
1266  * Scan was implemented rather in a hurry, and with support for only the basic
1267  * elements of the service in the backend API. Suggestions are welcome.
1268  */
1269 static Z_APDU *process_scanRequest(association *assoc, request *reqb, int *fd)
1270 {
1271     Z_ScanRequest *req = reqb->apdu_request->u.scanRequest;
1272     Z_APDU *apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1273     Z_ScanResponse *res = (Z_ScanResponse *)
1274         odr_malloc (assoc->encode, sizeof(*res));
1275     int *scanStatus = odr_intdup(assoc->encode, Z_Scan_failure);
1276     int *numberOfEntriesReturned = odr_intdup(assoc->encode, 0);
1277     Z_ListEntries *ents = (Z_ListEntries *)
1278         odr_malloc (assoc->encode, sizeof(*ents));
1279     Z_DiagRecs *diagrecs_p = NULL;
1280     oident *attset;
1281     bend_scan_rr *bsrr = (bend_scan_rr *)
1282         odr_malloc (assoc->encode, sizeof(*bsrr));
1283
1284     yaz_log(LOG_LOG, "Got ScanRequest");
1285
1286     apdu->which = Z_APDU_scanResponse;
1287     apdu->u.scanResponse = res;
1288     res->referenceId = req->referenceId;
1289
1290     /* if step is absent, set it to 0 */
1291     res->stepSize = odr_intdup(assoc->encode, 0);
1292     if (req->stepSize)
1293         *res->stepSize = *req->stepSize;
1294
1295     res->scanStatus = scanStatus;
1296     res->numberOfEntriesReturned = numberOfEntriesReturned;
1297     res->positionOfTerm = 0;
1298     res->entries = ents;
1299     ents->num_entries = 0;
1300     ents->entries = NULL;
1301     ents->num_nonsurrogateDiagnostics = 0;
1302     ents->nonsurrogateDiagnostics = NULL;
1303     res->attributeSet = 0;
1304     res->otherInfo = 0;
1305
1306     if (req->databaseNames)
1307     {
1308         int i;
1309         for (i = 0; i < req->num_databaseNames; i++)
1310             yaz_log (LOG_LOG, "Database '%s'", req->databaseNames[i]);
1311     }
1312     bsrr->num_bases = req->num_databaseNames;
1313     bsrr->basenames = req->databaseNames;
1314     bsrr->num_entries = *req->numberOfTermsRequested;
1315     bsrr->term = req->termListAndStartPoint;
1316     bsrr->referenceId = req->referenceId;
1317     bsrr->stream = assoc->encode;
1318     bsrr->print = assoc->print;
1319     bsrr->step_size = res->stepSize;
1320     if (req->attributeSet &&
1321         (attset = oid_getentbyoid(req->attributeSet)) &&
1322         (attset->oclass == CLASS_ATTSET || attset->oclass == CLASS_GENERAL))
1323         bsrr->attributeset = attset->value;
1324     else
1325         bsrr->attributeset = VAL_NONE;
1326     log_scan_term (req->termListAndStartPoint, bsrr->attributeset);
1327     bsrr->term_position = req->preferredPositionInResponse ?
1328         *req->preferredPositionInResponse : 1;
1329     ((int (*)(void *, bend_scan_rr *))
1330      (*assoc->init->bend_scan))(assoc->backend, bsrr);
1331     if (bsrr->errcode)
1332         diagrecs_p = diagrecs(assoc, bsrr->errcode, bsrr->errstring);
1333     else
1334     {
1335         int i;
1336         Z_Entry **tab = (Z_Entry **)
1337             odr_malloc (assoc->encode, sizeof(*tab) * bsrr->num_entries);
1338
1339         if (bsrr->status == BEND_SCAN_PARTIAL)
1340             *scanStatus = Z_Scan_partial_5;
1341         else
1342             *scanStatus = Z_Scan_success;
1343         ents->entries = tab;
1344         ents->num_entries = bsrr->num_entries;
1345         res->numberOfEntriesReturned = &ents->num_entries;
1346         res->positionOfTerm = &bsrr->term_position;
1347         for (i = 0; i < bsrr->num_entries; i++)
1348         {
1349             Z_Entry *e;
1350             Z_TermInfo *t;
1351             Odr_oct *o;
1352
1353             tab[i] = e = (Z_Entry *)odr_malloc(assoc->encode, sizeof(*e));
1354             if (bsrr->entries[i].occurrences >= 0)
1355             {
1356                 e->which = Z_Entry_termInfo;
1357                 e->u.termInfo = t = (Z_TermInfo *)
1358                     odr_malloc(assoc->encode, sizeof(*t));
1359                 t->suggestedAttributes = 0;
1360                 t->displayTerm = 0;
1361                 t->alternativeTerm = 0;
1362                 t->byAttributes = 0;
1363                 t->otherTermInfo = 0;
1364                 t->globalOccurrences = &bsrr->entries[i].occurrences;
1365                 t->term = (Z_Term *)
1366                     odr_malloc(assoc->encode, sizeof(*t->term));
1367                 t->term->which = Z_Term_general;
1368                 t->term->u.general = o =
1369                     (Odr_oct *)odr_malloc(assoc->encode, sizeof(Odr_oct));
1370                 o->buf = (unsigned char *)
1371                     odr_malloc(assoc->encode, o->len = o->size =
1372                                strlen(bsrr->entries[i].term));
1373                 memcpy(o->buf, bsrr->entries[i].term, o->len);
1374                 yaz_log(LOG_DEBUG, "  term #%d: '%s' (%d)", i,
1375                          bsrr->entries[i].term, bsrr->entries[i].occurrences);
1376             }
1377             else
1378             {
1379                 Z_DiagRecs *drecs = diagrecs (assoc,
1380                                               bsrr->entries[i].errcode,
1381                                               bsrr->entries[i].errstring);
1382                 assert (drecs->num_diagRecs == 1);
1383                 e->which = Z_Entry_surrogateDiagnostic;
1384                 assert (drecs->diagRecs[0]);
1385                 e->u.surrogateDiagnostic = drecs->diagRecs[0];
1386             }
1387         }
1388     }
1389     if (diagrecs_p)
1390     {
1391         ents->num_nonsurrogateDiagnostics = diagrecs_p->num_diagRecs;
1392         ents->nonsurrogateDiagnostics = diagrecs_p->diagRecs;
1393     }
1394     return apdu;
1395 }
1396
1397 static Z_APDU *process_sortRequest(association *assoc, request *reqb,
1398     int *fd)
1399 {
1400     Z_SortRequest *req = reqb->apdu_request->u.sortRequest;
1401     Z_SortResponse *res = (Z_SortResponse *)
1402         odr_malloc (assoc->encode, sizeof(*res));
1403     bend_sort_rr *bsrr = (bend_sort_rr *)
1404         odr_malloc (assoc->encode, sizeof(*bsrr));
1405
1406     Z_APDU *apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1407
1408     yaz_log(LOG_LOG, "Got SortRequest.");
1409
1410     bsrr->num_input_setnames = req->num_inputResultSetNames;
1411     bsrr->input_setnames = req->inputResultSetNames;
1412     bsrr->referenceId = req->referenceId;
1413     bsrr->output_setname = req->sortedResultSetName;
1414     bsrr->sort_sequence = req->sortSequence;
1415     bsrr->stream = assoc->encode;
1416     bsrr->print = assoc->print;
1417
1418     bsrr->sort_status = Z_SortStatus_failure;
1419     bsrr->errcode = 0;
1420     bsrr->errstring = 0;
1421
1422     (*assoc->init->bend_sort)(assoc->backend, bsrr);
1423
1424     res->referenceId = bsrr->referenceId;
1425     res->sortStatus = odr_intdup(assoc->encode, bsrr->sort_status);
1426     res->resultSetStatus = 0;
1427     if (bsrr->errcode)
1428     {
1429         Z_DiagRecs *dr = diagrecs (assoc, bsrr->errcode, bsrr->errstring);
1430         res->diagnostics = dr->diagRecs;
1431         res->num_diagnostics = dr->num_diagRecs;
1432     }
1433     else
1434     {
1435         res->num_diagnostics = 0;
1436         res->diagnostics = 0;
1437     }
1438     res->otherInfo = 0;
1439
1440     apdu->which = Z_APDU_sortResponse;
1441     apdu->u.sortResponse = res;
1442     return apdu;
1443 }
1444
1445 static Z_APDU *process_deleteRequest(association *assoc, request *reqb,
1446     int *fd)
1447 {
1448     Z_DeleteResultSetRequest *req =
1449         reqb->apdu_request->u.deleteResultSetRequest;
1450     Z_DeleteResultSetResponse *res = (Z_DeleteResultSetResponse *)
1451         odr_malloc (assoc->encode, sizeof(*res));
1452     bend_delete_rr *bdrr = (bend_delete_rr *)
1453         odr_malloc (assoc->encode, sizeof(*bdrr));
1454     Z_APDU *apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1455
1456     yaz_log(LOG_LOG, "Got DeleteRequest.");
1457
1458     bdrr->num_setnames = req->num_resultSetList;
1459     bdrr->setnames = req->resultSetList;
1460     bdrr->stream = assoc->encode;
1461     bdrr->print = assoc->print;
1462     bdrr->function = *req->deleteFunction;
1463     bdrr->referenceId = req->referenceId;
1464     bdrr->statuses = 0;
1465     if (bdrr->num_setnames > 0)
1466     {
1467         int i;
1468         bdrr->statuses = (int*)
1469             odr_malloc(assoc->encode, sizeof(*bdrr->statuses) *
1470                        bdrr->num_setnames);
1471         for (i = 0; i < bdrr->num_setnames; i++)
1472             bdrr->statuses[i] = 0;
1473     }
1474     (*assoc->init->bend_delete)(assoc->backend, bdrr);
1475
1476     res->referenceId = req->referenceId;
1477
1478     res->deleteOperationStatus = odr_intdup(assoc->encode,bdrr->delete_status);
1479
1480     res->deleteListStatuses = 0;
1481     if (bdrr->num_setnames > 0)
1482     {
1483         int i;
1484         res->deleteListStatuses = (Z_ListStatuses *)
1485             odr_malloc(assoc->encode, sizeof(*res->deleteListStatuses));
1486         res->deleteListStatuses->num = bdrr->num_setnames;
1487         res->deleteListStatuses->elements =
1488             (Z_ListStatus **)
1489             odr_malloc (assoc->encode,
1490                         sizeof(*res->deleteListStatuses->elements) *
1491                         bdrr->num_setnames);
1492         for (i = 0; i<bdrr->num_setnames; i++)
1493         {
1494             res->deleteListStatuses->elements[i] =
1495                 (Z_ListStatus *)
1496                 odr_malloc (assoc->encode,
1497                             sizeof(**res->deleteListStatuses->elements));
1498             res->deleteListStatuses->elements[i]->status = bdrr->statuses+i;
1499             res->deleteListStatuses->elements[i]->id =
1500                 odr_strdup (assoc->encode, bdrr->setnames[i]);
1501
1502         }
1503     }
1504     res->numberNotDeleted = 0;
1505     res->bulkStatuses = 0;
1506     res->deleteMessage = 0;
1507     res->otherInfo = 0;
1508
1509     apdu->which = Z_APDU_deleteResultSetResponse;
1510     apdu->u.deleteResultSetResponse = res;
1511     return apdu;
1512 }
1513
1514 static void process_close(association *assoc, request *reqb)
1515 {
1516     Z_Close *req = reqb->apdu_request->u.close;
1517     static char *reasons[] =
1518     {
1519         "finished",
1520         "shutdown",
1521         "systemProblem",
1522         "costLimit",
1523         "resources",
1524         "securityViolation",
1525         "protocolError",
1526         "lackOfActivity",
1527         "peerAbort",
1528         "unspecified"
1529     };
1530
1531     yaz_log(LOG_LOG, "Got Close, reason %s, message %s",
1532         reasons[*req->closeReason], req->diagnosticInformation ?
1533         req->diagnosticInformation : "NULL");
1534     if (assoc->version < 3) /* to make do_force respond with close */
1535         assoc->version = 3;
1536     do_close_req(assoc, Z_Close_finished,
1537                  "Association terminated by client", reqb);
1538 }
1539
1540 void save_referenceId (request *reqb, Z_ReferenceId *refid)
1541 {
1542     if (refid)
1543     {
1544         reqb->len_refid = refid->len;
1545         reqb->refid = (char *)nmem_malloc (reqb->request_mem, refid->len);
1546         memcpy (reqb->refid, refid->buf, refid->len);
1547     }
1548     else
1549     {
1550         reqb->len_refid = 0;
1551         reqb->refid = NULL;
1552     }
1553 }
1554
1555 void bend_request_send (bend_association a, bend_request req, Z_APDU *res)
1556 {
1557     process_response (a, req, res);
1558 }
1559
1560 bend_request bend_request_mk (bend_association a)
1561 {
1562     request *nreq = request_get (&a->outgoing);
1563     nreq->request_mem = nmem_create ();
1564     return nreq;
1565 }
1566
1567 Z_ReferenceId *bend_request_getid (ODR odr, bend_request req)
1568 {
1569     Z_ReferenceId *id;
1570     if (!req->refid)
1571         return 0;
1572     id = (Odr_oct *)odr_malloc (odr, sizeof(*odr));
1573     id->buf = (unsigned char *)odr_malloc (odr, req->len_refid);
1574     id->len = id->size = req->len_refid;
1575     memcpy (id->buf, req->refid, req->len_refid);
1576     return id;
1577 }
1578
1579 void bend_request_destroy (bend_request *req)
1580 {
1581     nmem_destroy((*req)->request_mem);
1582     request_release(*req);
1583     *req = NULL;
1584 }
1585
1586 int bend_backend_respond (bend_association a, bend_request req)
1587 {
1588     char *msg;
1589     int r;
1590     r = process_request (a, req, &msg);
1591     if (r < 0)
1592         logf (LOG_WARN, "%s", msg);
1593     return r;
1594 }
1595
1596 void bend_request_setdata(bend_request r, void *p)
1597 {
1598     r->clientData = p;
1599 }
1600
1601 void *bend_request_getdata(bend_request r)
1602 {
1603     return r->clientData;
1604 }
1605
1606 static Z_APDU *process_segmentRequest (association *assoc, request *reqb)
1607 {
1608     bend_segment_rr req;
1609
1610     req.segment = reqb->apdu_request->u.segmentRequest;
1611     req.stream = assoc->encode;
1612     req.decode = assoc->decode;
1613     req.print = assoc->print;
1614     req.association = assoc;
1615
1616     (*assoc->init->bend_segment)(assoc->backend, &req);
1617
1618     return 0;
1619 }
1620
1621 static Z_APDU *process_ESRequest(association *assoc, request *reqb, int *fd)
1622 {
1623     bend_esrequest_rr esrequest;
1624
1625     Z_ExtendedServicesRequest *req = reqb->apdu_request->u.extendedServicesRequest;
1626     Z_APDU *apdu = zget_APDU(assoc->encode, Z_APDU_extendedServicesResponse);
1627
1628     Z_ExtendedServicesResponse *resp = apdu->u.extendedServicesResponse;
1629
1630     yaz_log(LOG_DEBUG,"inside Process esRequest");
1631
1632     esrequest.esr = reqb->apdu_request->u.extendedServicesRequest;
1633     esrequest.stream = assoc->encode;
1634     esrequest.decode = assoc->decode;
1635     esrequest.print = assoc->print;
1636     esrequest.errcode = 0;
1637     esrequest.errstring = NULL;
1638     esrequest.request = reqb;
1639     esrequest.association = assoc;
1640     esrequest.taskPackage = 0;
1641     esrequest.referenceId = req->referenceId;
1642
1643     (*assoc->init->bend_esrequest)(assoc->backend, &esrequest);
1644
1645     /* If the response is being delayed, return NULL */
1646     if (esrequest.request == NULL)
1647         return(NULL);
1648
1649     resp->referenceId = req->referenceId;
1650
1651     if (esrequest.errcode == -1)
1652     {
1653         /* Backend service indicates request will be processed */
1654         yaz_log(LOG_DEBUG,"Request could be processed...Accepted !");
1655         *resp->operationStatus = Z_ExtendedServicesResponse_accepted;
1656     }
1657     else if (esrequest.errcode == 0)
1658     {
1659         /* Backend service indicates request will be processed */
1660         yaz_log(LOG_DEBUG,"Request could be processed...Done !");
1661         *resp->operationStatus = Z_ExtendedServicesResponse_done;
1662     }
1663     else
1664     {
1665         Z_DiagRecs *diagRecs = diagrecs (assoc, esrequest.errcode,
1666                                          esrequest.errstring);
1667
1668         /* Backend indicates error, request will not be processed */
1669         yaz_log(LOG_DEBUG,"Request could not be processed...failure !");
1670         *resp->operationStatus = Z_ExtendedServicesResponse_failure;
1671         resp->num_diagnostics = diagRecs->num_diagRecs;
1672         resp->diagnostics = diagRecs->diagRecs;
1673     }
1674     /* Do something with the members of bend_extendedservice */
1675     if (esrequest.taskPackage)
1676         resp->taskPackage = z_ext_record (assoc->encode, VAL_EXTENDED,
1677                                          (const char *)  esrequest.taskPackage,
1678                                           -1);
1679     yaz_log(LOG_DEBUG,"Send the result apdu");
1680     return apdu;
1681 }