server/seshigh.c

   1 /*
   2  * Copyright (c) 1995-2003, Index Data
   3  * See the file LICENSE for details.
   4  *
   5  * $Id: seshigh.c,v 1.133 2003-01-06 08:20:28 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             odr_setprint(anew->print, yaz_log_file());
 113         }
 114         else if (*control_block->apdufile != '-')
 115         {
 116             strcpy(filename, control_block->apdufile);
 117             if (!control_block->dynamic)
 118             {
 119                 if (!apduf)
 120                 {
 121                     if (!(apduf = fopen(filename, "w")))
 122                     {
 123                         yaz_log(LOG_WARN|LOG_ERRNO, "%s", filename);
 124                         return 0;
 125                     }
 126                     setvbuf(apduf, 0, _IONBF, 0);
 127                 }
 128                 f = apduf;
 129             }
 130             else
 131             {
 132                 sprintf(filename + strlen(filename), ".%d", getpid());
 133                 if (!(f = fopen(filename, "w")))
 134                 {
 135                     yaz_log(LOG_WARN|LOG_ERRNO, "%s", filename);
 136                     return 0;
 137                 }
 138                 setvbuf(f, 0, _IONBF, 0);
 139             }
 140             odr_setprint(anew->print, f);
 141         }
 142     }
 143     else
 144         anew->print = 0;
 145     anew->input_buffer = 0;
 146     anew->input_buffer_len = 0;
 147     anew->backend = 0;
 148     anew->state = ASSOC_NEW;
 149     request_initq(&anew->incoming);
 150     request_initq(&anew->outgoing);
 151     anew->proto = cs_getproto(link);
 152     return anew;
 153 }
 154
 155 /*
 156  * Free association and release resources.
 157  */
 158 void destroy_association(association *h)
 159 {
 160     statserv_options_block *cb = statserv_getcontrol();
 161
 162     xfree(h->init);
 163     odr_destroy(h->decode);
 164     odr_destroy(h->encode);
 165     if (h->print)
 166         odr_destroy(h->print);
 167     if (h->input_buffer)
 168     xfree(h->input_buffer);
 169     if (h->backend)
 170         (*cb->bend_close)(h->backend);
 171     while (request_deq(&h->incoming));
 172     while (request_deq(&h->outgoing));
 173     request_delq(&h->incoming);
 174     request_delq(&h->outgoing);
 175     xfree(h);
 176     xmalloc_trav("session closed");
 177     if (control_block && control_block->one_shot)
 178         exit (0);
 179 }
 180
 181 static void do_close_req(association *a, int reason, char *message,
 182                          request *req)
 183 {
 184     Z_APDU apdu;
 185     Z_Close *cls = zget_Close(a->encode);
 186
 187     /* Purge request queue */
 188     while (request_deq(&a->incoming));
 189     while (request_deq(&a->outgoing));
 190     if (a->version >= 3)
 191     {
 192         yaz_log(LOG_LOG, "Sending Close PDU, reason=%d, message=%s",
 193             reason, message ? message : "none");
 194         apdu.which = Z_APDU_close;
 195         apdu.u.close = cls;
 196         *cls->closeReason = reason;
 197         cls->diagnosticInformation = message;
 198         process_response(a, req, &apdu);
 199         iochan_settimeout(a->client_chan, 60);
 200     }
 201     else
 202     {
 203         yaz_log(LOG_DEBUG, "v2 client. No Close PDU");
 204         iochan_setevent(a->client_chan, EVENT_TIMEOUT); /* force imm close */
 205     }
 206     a->state = ASSOC_DEAD;
 207 }
 208
 209 static void do_close(association *a, int reason, char *message)
 210 {
 211     do_close_req (a, reason, message, request_get(&a->outgoing));
 212 }
 213
 214 /*
 215  * This is where PDUs from the client are read and the further
 216  * processing is initiated. Flow of control moves down through the
 217  * various process_* functions below, until the encoded result comes back up
 218  * to the output handler in here.
 219  *
 220  *  h     : the I/O channel that has an outstanding event.
 221  *  event : the current outstanding event.
 222  */
 223 void ir_session(IOCHAN h, int event)
 224 {
 225     int res;
 226     association *assoc = (association *)iochan_getdata(h);
 227     COMSTACK conn = assoc->client_link;
 228     request *req;
 229
 230     assert(h && conn && assoc);
 231     if (event == EVENT_TIMEOUT)
 232     {
 233         if (assoc->state != ASSOC_UP)
 234         {
 235             yaz_log(LOG_LOG, "Final timeout - closing connection.");
 236             cs_close(conn);
 237             destroy_association(assoc);
 238             iochan_destroy(h);
 239         }
 240         else
 241         {
 242             yaz_log(LOG_LOG, "Session idle too long. Sending close.");
 243             do_close(assoc, Z_Close_lackOfActivity, 0);
 244         }
 245         return;
 246     }
 247     if (event & assoc->cs_accept_mask)
 248     {
 249         yaz_log (LOG_DEBUG, "ir_session (accept)");
 250         if (!cs_accept (conn))
 251         {
 252             yaz_log (LOG_LOG, "accept failed");
 253             destroy_association(assoc);
 254             iochan_destroy(h);
 255         }
 256         iochan_clearflag (h, EVENT_OUTPUT|EVENT_OUTPUT);
 257         if (conn->io_pending)
 258         {   /* cs_accept didn't complete */
 259             assoc->cs_accept_mask =
 260                 ((conn->io_pending & CS_WANT_WRITE) ? EVENT_OUTPUT : 0) |
 261                 ((conn->io_pending & CS_WANT_READ) ? EVENT_INPUT : 0);
 262
 263             iochan_setflag (h, assoc->cs_accept_mask);
 264         }
 265         else
 266         {   /* cs_accept completed. Prepare for reading (cs_get) */
 267             assoc->cs_accept_mask = 0;
 268             assoc->cs_get_mask = EVENT_INPUT;
 269             iochan_setflag (h, assoc->cs_get_mask);
 270         }
 271         return;
 272     }
 273     if ((event & assoc->cs_get_mask) || (event & EVENT_WORK)) /* input */
 274     {
 275         if ((assoc->cs_put_mask & EVENT_INPUT) == 0 && (event & assoc->cs_get_mask))
 276         {
 277             yaz_log(LOG_DEBUG, "ir_session (input)");
 278             /* We aren't speaking to this fellow */
 279             if (assoc->state == ASSOC_DEAD)
 280             {
 281                 yaz_log(LOG_LOG, "Closed connection after reject");
 282                 cs_close(conn);
 283                 destroy_association(assoc);
 284                 iochan_destroy(h);
 285                 return;
 286             }
 287             assoc->cs_get_mask = EVENT_INPUT;
 288             if ((res = cs_get(conn, &assoc->input_buffer,
 289                 &assoc->input_buffer_len)) <= 0)
 290             {
 291                 yaz_log(LOG_LOG, "Connection closed by client");
 292                 cs_close(conn);
 293                 destroy_association(assoc);
 294                 iochan_destroy(h);
 295                 return;
 296             }
 297             else if (res == 1) /* incomplete read - wait for more  */
 298             {
 299                 if (conn->io_pending & CS_WANT_WRITE)
 300                     assoc->cs_get_mask |= EVENT_OUTPUT;
 301                 iochan_setflag(h, assoc->cs_get_mask);
 302                 return;
 303             }
 304             if (cs_more(conn)) /* more stuff - call us again later, please */
 305                 iochan_setevent(h, EVENT_INPUT);
 306
 307             /* we got a complete PDU. Let's decode it */
 308             yaz_log(LOG_DEBUG, "Got PDU, %d bytes", res);
 309             req = request_get(&assoc->incoming); /* get a new request structure */
 310             odr_reset(assoc->decode);
 311             odr_setbuf(assoc->decode, assoc->input_buffer, res, 0);
 312             if (!z_APDU(assoc->decode, &req->apdu_request, 0, 0))
 313             {
 314                 yaz_log(LOG_LOG, "ODR error on incoming PDU: %s [near byte %d] ",
 315                         odr_errmsg(odr_geterror(assoc->decode)),
 316                         odr_offset(assoc->decode));
 317                 yaz_log(LOG_LOG, "PDU dump:");
 318                 odr_dumpBER(yaz_log_file(), assoc->input_buffer, res);
 319                 do_close(assoc, Z_Close_protocolError, "Malformed package");
 320                 return;
 321             }
 322             req->request_mem = odr_extract_mem(assoc->decode);
 323             if (assoc->print && !z_APDU(assoc->print, &req->apdu_request, 0, 0))
 324             {
 325                 yaz_log(LOG_WARN, "ODR print error: %s",
 326                     odr_errmsg(odr_geterror(assoc->print)));
 327                 odr_reset(assoc->print);
 328             }
 329             request_enq(&assoc->incoming, req);
 330         }
 331
 332         /* can we do something yet? */
 333         req = request_head(&assoc->incoming);
 334         if (req->state == REQUEST_IDLE)
 335         {
 336             char *msg;
 337             request_deq(&assoc->incoming);
 338             if (process_request(assoc, req, &msg) < 0)
 339                 do_close_req(assoc, Z_Close_systemProblem, msg, req);
 340         }
 341     }
 342     if (event & assoc->cs_put_mask)
 343     {
 344         request *req = request_head(&assoc->outgoing);
 345
 346         assoc->cs_put_mask = 0;
 347         yaz_log(LOG_DEBUG, "ir_session (output)");
 348         req->state = REQUEST_PENDING;
 349         switch (res = cs_put(conn, req->response, req->len_response))
 350         {
 351         case -1:
 352             yaz_log(LOG_LOG, "Connection closed by client");
 353             cs_close(conn);
 354             destroy_association(assoc);
 355             iochan_destroy(h);
 356             break;
 357         case 0: /* all sent - release the request structure */
 358             yaz_log(LOG_DEBUG, "Wrote PDU, %d bytes", req->len_response);
 359             nmem_destroy(req->request_mem);
 360             request_deq(&assoc->outgoing);
 361             request_release(req);
 362             if (!request_head(&assoc->outgoing))
 363             {   /* restore mask for cs_get operation ... */
 364                 iochan_clearflag(h, EVENT_OUTPUT|EVENT_INPUT);
 365                 iochan_setflag(h, assoc->cs_get_mask);
 366             }
 367             else
 368                 assoc->cs_put_mask = EVENT_OUTPUT;
 369             break;
 370         default:
 371             if (conn->io_pending & CS_WANT_WRITE)
 372                 assoc->cs_put_mask |= EVENT_OUTPUT;
 373             if (conn->io_pending & CS_WANT_READ)
 374                 assoc->cs_put_mask |= EVENT_INPUT;
 375             iochan_setflag(h, assoc->cs_put_mask);
 376         }
 377     }
 378     if (event & EVENT_EXCEPT)
 379     {
 380         yaz_log(LOG_LOG, "ir_session (exception)");
 381         cs_close(conn);
 382         destroy_association(assoc);
 383         iochan_destroy(h);
 384     }
 385 }
 386
 387 /*
 388  * Initiate request processing.
 389  */
 390 static int process_request(association *assoc, request *req, char **msg)
 391 {
 392     int fd = -1;
 393     Z_APDU *res;
 394     int retval;
 395
 396     *msg = "Unknown Error";
 397     assert(req && req->state == REQUEST_IDLE);
 398     if (req->apdu_request->which != Z_APDU_initRequest && !assoc->init)
 399     {
 400         *msg = "Missing InitRequest";
 401         return -1;
 402     }
 403     switch (req->apdu_request->which)
 404     {
 405     case Z_APDU_initRequest:
 406         res = process_initRequest(assoc, req); break;
 407     case Z_APDU_searchRequest:
 408         res = process_searchRequest(assoc, req, &fd); break;
 409     case Z_APDU_presentRequest:
 410         res = process_presentRequest(assoc, req, &fd); break;
 411     case Z_APDU_scanRequest:
 412         if (assoc->init->bend_scan)
 413             res = process_scanRequest(assoc, req, &fd);
 414         else
 415         {
 416             *msg = "Cannot handle Scan APDU";
 417             return -1;
 418         }
 419         break;
 420     case Z_APDU_extendedServicesRequest:
 421         if (assoc->init->bend_esrequest)
 422             res = process_ESRequest(assoc, req, &fd);
 423         else
 424         {
 425             *msg = "Cannot handle Extended Services APDU";
 426             return -1;
 427         }
 428         break;
 429     case Z_APDU_sortRequest:
 430         if (assoc->init->bend_sort)
 431             res = process_sortRequest(assoc, req, &fd);
 432         else
 433         {
 434             *msg = "Cannot handle Sort APDU";
 435             return -1;
 436         }
 437         break;
 438     case Z_APDU_close:
 439         process_close(assoc, req);
 440         return 0;
 441     case Z_APDU_deleteResultSetRequest:
 442         if (assoc->init->bend_delete)
 443             res = process_deleteRequest(assoc, req, &fd);
 444         else
 445         {
 446             *msg = "Cannot handle Delete APDU";
 447             return -1;
 448         }
 449         break;
 450     case Z_APDU_segmentRequest:
 451         if (assoc->init->bend_segment)
 452         {
 453             res = process_segmentRequest (assoc, req);
 454         }
 455         else
 456         {
 457             *msg = "Cannot handle Segment APDU";
 458             return -1;
 459         }
 460         break;
 461     default:
 462         *msg = "Bad APDU received";
 463         return -1;
 464     }
 465     if (res)
 466     {
 467         yaz_log(LOG_DEBUG, "  result immediately available");
 468         retval = process_response(assoc, req, res);
 469     }
 470     else if (fd < 0)
 471     {
 472         yaz_log(LOG_DEBUG, "  result unavailble");
 473         retval = 0;
 474     }
 475     else /* no result yet - one will be provided later */
 476     {
 477         IOCHAN chan;
 478
 479         /* Set up an I/O handler for the fd supplied by the backend */
 480
 481         yaz_log(LOG_DEBUG, "   establishing handler for result");
 482         req->state = REQUEST_PENDING;
 483         if (!(chan = iochan_create(fd, backend_response, EVENT_INPUT)))
 484             abort();
 485         iochan_setdata(chan, assoc);
 486         retval = 0;
 487     }
 488     return retval;
 489 }
 490
 491 /*
 492  * Handle message from the backend.
 493  */
 494 void backend_response(IOCHAN i, int event)
 495 {
 496     association *assoc = (association *)iochan_getdata(i);
 497     request *req = request_head(&assoc->incoming);
 498     Z_APDU *res;
 499     int fd;
 500
 501     yaz_log(LOG_DEBUG, "backend_response");
 502     assert(assoc && req && req->state != REQUEST_IDLE);
 503     /* determine what it is we're waiting for */
 504     switch (req->apdu_request->which)
 505     {
 506         case Z_APDU_searchRequest:
 507             res = response_searchRequest(assoc, req, 0, &fd); break;
 508 #if 0
 509         case Z_APDU_presentRequest:
 510             res = response_presentRequest(assoc, req, 0, &fd); break;
 511         case Z_APDU_scanRequest:
 512             res = response_scanRequest(assoc, req, 0, &fd); break;
 513 #endif
 514         default:
 515             yaz_log(LOG_WARN, "Serious programmer's lapse or bug");
 516             abort();
 517     }
 518     if ((res && process_response(assoc, req, res) < 0) || fd < 0)
 519     {
 520         yaz_log(LOG_LOG, "Fatal error when talking to backend");
 521         do_close(assoc, Z_Close_systemProblem, 0);
 522         iochan_destroy(i);
 523         return;
 524     }
 525     else if (!res) /* no result yet - try again later */
 526     {
 527         yaz_log(LOG_DEBUG, "   no result yet");
 528         iochan_setfd(i, fd); /* in case fd has changed */
 529     }
 530 }
 531
 532 /*
 533  * Encode response, and transfer the request structure to the outgoing queue.
 534  */
 535 static int process_response(association *assoc, request *req, Z_APDU *res)
 536 {
 537     odr_setbuf(assoc->encode, req->response, req->size_response, 1);
 538
 539     if (assoc->print && !z_APDU(assoc->print, &res, 0, 0))
 540     {
 541         yaz_log(LOG_WARN, "ODR print error: %s",
 542             odr_errmsg(odr_geterror(assoc->print)));
 543         odr_reset(assoc->print);
 544     }
 545     if (!z_APDU(assoc->encode, &res, 0, 0))
 546     {
 547         yaz_log(LOG_WARN, "ODR error when encoding response: %s",
 548             odr_errmsg(odr_geterror(assoc->decode)));
 549         return -1;
 550     }
 551     req->response = odr_getbuf(assoc->encode, &req->len_response,
 552         &req->size_response);
 553     odr_setbuf(assoc->encode, 0, 0, 0); /* don'txfree if we abort later */
 554     odr_reset(assoc->encode);
 555     req->state = REQUEST_IDLE;
 556     request_enq(&assoc->outgoing, req);
 557     /* turn the work over to the ir_session handler */
 558     iochan_setflag(assoc->client_chan, EVENT_OUTPUT);
 559     assoc->cs_put_mask = EVENT_OUTPUT;
 560     /* Is there more work to be done? give that to the input handler too */
 561 #if 1
 562     if (request_head(&assoc->incoming))
 563     {
 564         yaz_log (LOG_DEBUG, "more work to be done");
 565         iochan_setevent(assoc->client_chan, EVENT_WORK);
 566     }
 567 #endif
 568     return 0;
 569 }
 570
 571 /*
 572  * Handle init request.
 573  * At the moment, we don't check the options
 574  * anywhere else in the code - we just try not to do anything that would
 575  * break a naive client. We'll toss 'em into the association block when
 576  * we need them there.
 577  */
 578 static Z_APDU *process_initRequest(association *assoc, request *reqb)
 579 {
 580     statserv_options_block *cb = statserv_getcontrol();
 581     Z_InitRequest *req = reqb->apdu_request->u.initRequest;
 582     Z_APDU *apdu = zget_APDU(assoc->encode, Z_APDU_initResponse);
 583     Z_InitResponse *resp = apdu->u.initResponse;
 584     bend_initresult *binitres;
 585
 586     char options[140];
 587
 588     xfree (assoc->init);
 589     assoc->init = (bend_initrequest *) xmalloc (sizeof(*assoc->init));
 590
 591     yaz_log(LOG_LOG, "Got initRequest");
 592     if (req->implementationId)
 593         yaz_log(LOG_LOG, "Id:        %s", req->implementationId);
 594     if (req->implementationName)
 595         yaz_log(LOG_LOG, "Name:      %s", req->implementationName);
 596     if (req->implementationVersion)
 597         yaz_log(LOG_LOG, "Version:   %s", req->implementationVersion);
 598
 599     assoc->init->stream = assoc->encode;
 600     assoc->init->print = assoc->print;
 601     assoc->init->auth = req->idAuthentication;
 602     assoc->init->referenceId = req->referenceId;
 603     assoc->init->implementation_version = 0;
 604     assoc->init->implementation_id = 0;
 605     assoc->init->implementation_name = 0;
 606     assoc->init->bend_sort = NULL;
 607     assoc->init->bend_search = NULL;
 608     assoc->init->bend_present = NULL;
 609     assoc->init->bend_esrequest = NULL;
 610     assoc->init->bend_delete = NULL;
 611     assoc->init->bend_scan = NULL;
 612     assoc->init->bend_segment = NULL;
 613     assoc->init->bend_fetch = NULL;
 614     assoc->init->charneg_request = NULL;
 615     assoc->init->charneg_response = NULL;
 616     assoc->init->decode = assoc->decode;
 617
 618     if (ODR_MASK_GET(req->options, Z_Options_negotiationModel))
 619     {
 620         Z_CharSetandLanguageNegotiation *negotiation =
 621             yaz_get_charneg_record (req->otherInfo);
 622         if (negotiation->which == Z_CharSetandLanguageNegotiation_proposal)
 623             assoc->init->charneg_request = negotiation;
 624     }
 625
 626     assoc->init->peer_name =
 627         odr_strdup (assoc->encode, cs_addrstr(assoc->client_link));
 628     if (!(binitres = (*cb->bend_init)(assoc->init)))
 629     {
 630         yaz_log(LOG_WARN, "Bad response from backend.");
 631         return 0;
 632     }
 633
 634     assoc->backend = binitres->handle;
 635     if ((assoc->init->bend_sort))
 636         yaz_log (LOG_DEBUG, "Sort handler installed");
 637     if ((assoc->init->bend_search))
 638         yaz_log (LOG_DEBUG, "Search handler installed");
 639     if ((assoc->init->bend_present))
 640         yaz_log (LOG_DEBUG, "Present handler installed");
 641     if ((assoc->init->bend_esrequest))
 642         yaz_log (LOG_DEBUG, "ESRequest handler installed");
 643     if ((assoc->init->bend_delete))
 644         yaz_log (LOG_DEBUG, "Delete handler installed");
 645     if ((assoc->init->bend_scan))
 646         yaz_log (LOG_DEBUG, "Scan handler installed");
 647     if ((assoc->init->bend_segment))
 648         yaz_log (LOG_DEBUG, "Segment handler installed");
 649
 650     resp->referenceId = req->referenceId;
 651     *options = '\0';
 652     /* let's tell the client what we can do */
 653     if (ODR_MASK_GET(req->options, Z_Options_search))
 654     {
 655         ODR_MASK_SET(resp->options, Z_Options_search);
 656         strcat(options, "srch");
 657     }
 658     if (ODR_MASK_GET(req->options, Z_Options_present))
 659     {
 660         ODR_MASK_SET(resp->options, Z_Options_present);
 661         strcat(options, " prst");
 662     }
 663     if (ODR_MASK_GET(req->options, Z_Options_delSet) &&
 664         assoc->init->bend_delete)
 665     {
 666         ODR_MASK_SET(resp->options, Z_Options_delSet);
 667         strcat(options, " del");
 668     }
 669     if (ODR_MASK_GET(req->options, Z_Options_extendedServices) &&
 670         assoc->init->bend_esrequest)
 671     {
 672         ODR_MASK_SET(resp->options, Z_Options_extendedServices);
 673         strcat (options, " extendedServices");
 674     }
 675     if (ODR_MASK_GET(req->options, Z_Options_namedResultSets))
 676     {
 677         ODR_MASK_SET(resp->options, Z_Options_namedResultSets);
 678         strcat(options, " namedresults");
 679     }
 680     if (ODR_MASK_GET(req->options, Z_Options_scan) && assoc->init->bend_scan)
 681     {
 682         ODR_MASK_SET(resp->options, Z_Options_scan);
 683         strcat(options, " scan");
 684     }
 685     if (ODR_MASK_GET(req->options, Z_Options_concurrentOperations))
 686     {
 687         ODR_MASK_SET(resp->options, Z_Options_concurrentOperations);
 688         strcat(options, " concurrop");
 689     }
 690     if (ODR_MASK_GET(req->options, Z_Options_sort) && assoc->init->bend_sort)
 691     {
 692         ODR_MASK_SET(resp->options, Z_Options_sort);
 693         strcat(options, " sort");
 694     }
 695
 696     if (ODR_MASK_GET(req->options, Z_Options_negotiationModel)
 697         && assoc->init->charneg_response)
 698     {
 699         Z_OtherInformation **p;
 700         Z_OtherInformationUnit *p0;
 701
 702         yaz_oi_APDU(apdu, &p);
 703
 704         if ((p0=yaz_oi_update(p, assoc->encode, NULL, 0, 0))) {
 705             ODR_MASK_SET(resp->options, Z_Options_negotiationModel);
 706
 707             p0->which = Z_OtherInfo_externallyDefinedInfo;
 708             p0->information.externallyDefinedInfo =
 709                 assoc->init->charneg_response;
 710         }
 711         ODR_MASK_SET(resp->options, Z_Options_negotiationModel);
 712         strcat(options, " negotiation");
 713     }
 714
 715     if (ODR_MASK_GET(req->protocolVersion, Z_ProtocolVersion_1))
 716     {
 717         ODR_MASK_SET(resp->protocolVersion, Z_ProtocolVersion_1);
 718         assoc->version = 2; /* 1 & 2 are equivalent */
 719     }
 720     if (ODR_MASK_GET(req->protocolVersion, Z_ProtocolVersion_2))
 721     {
 722         ODR_MASK_SET(resp->protocolVersion, Z_ProtocolVersion_2);
 723         assoc->version = 2;
 724     }
 725     if (ODR_MASK_GET(req->protocolVersion, Z_ProtocolVersion_3))
 726     {
 727         ODR_MASK_SET(resp->protocolVersion, Z_ProtocolVersion_3);
 728         assoc->version = 3;
 729     }
 730
 731     yaz_log(LOG_LOG, "Negotiated to v%d: %s", assoc->version, options);
 732     assoc->maximumRecordSize = *req->maximumRecordSize;
 733     if (assoc->maximumRecordSize > control_block->maxrecordsize)
 734         assoc->maximumRecordSize = control_block->maxrecordsize;
 735     assoc->preferredMessageSize = *req->preferredMessageSize;
 736     if (assoc->preferredMessageSize > assoc->maximumRecordSize)
 737         assoc->preferredMessageSize = assoc->maximumRecordSize;
 738
 739 #if 0
 740     assoc->maximumRecordSize = 3000000;
 741     assoc->preferredMessageSize = 3000000;
 742 #endif
 743
 744     resp->preferredMessageSize = &assoc->preferredMessageSize;
 745     resp->maximumRecordSize = &assoc->maximumRecordSize;
 746
 747     resp->implementationName = "GFS/YAZ";
 748
 749     if (assoc->init->implementation_id)
 750     {
 751         char *nv = (char *)
 752             odr_malloc (assoc->encode,
 753                         strlen(assoc->init->implementation_id) + 10 +
 754                                strlen(resp->implementationId));
 755         sprintf (nv, "%s / %s",
 756                  resp->implementationId, assoc->init->implementation_id);
 757         resp->implementationId = nv;
 758     }
 759     if (assoc->init->implementation_name)
 760     {
 761         char *nv = (char *)
 762             odr_malloc (assoc->encode,
 763                         strlen(assoc->init->implementation_name) + 10 +
 764                                strlen(resp->implementationName));
 765         sprintf (nv, "%s / %s",
 766                  resp->implementationName, assoc->init->implementation_name);
 767         resp->implementationName = nv;
 768     }
 769     if (assoc->init->implementation_version)
 770     {
 771         char *nv = (char *)
 772             odr_malloc (assoc->encode,
 773                         strlen(assoc->init->implementation_version) + 10 +
 774                                strlen(resp->implementationVersion));
 775         sprintf (nv, "YAZ %s / %s",
 776                  resp->implementationVersion,
 777                  assoc->init->implementation_version);
 778         resp->implementationVersion = nv;
 779     }
 780
 781     if (binitres->errcode)
 782     {
 783         yaz_log(LOG_LOG, "Connection rejected by backend.");
 784         *resp->result = 0;
 785         assoc->state = ASSOC_DEAD;
 786     }
 787     else
 788         assoc->state = ASSOC_UP;
 789     return apdu;
 790 }
 791
 792 /*
 793  * These functions should be merged.
 794  */
 795
 796 static void set_addinfo (Z_DefaultDiagFormat *dr, char *addinfo, ODR odr)
 797 {
 798     dr->which = Z_DefaultDiagFormat_v2Addinfo;
 799     dr->u.v2Addinfo = odr_strdup (odr, addinfo ? addinfo : "");
 800 }
 801
 802 /*
 803  * nonsurrogate diagnostic record.
 804  */
 805 static Z_Records *diagrec(association *assoc, int error, char *addinfo)
 806 {
 807     Z_Records *rec = (Z_Records *)
 808         odr_malloc (assoc->encode, sizeof(*rec));
 809     int *err = odr_intdup(assoc->encode, error);
 810     Z_DiagRec *drec = (Z_DiagRec *)
 811         odr_malloc (assoc->encode, sizeof(*drec));
 812     Z_DefaultDiagFormat *dr = (Z_DefaultDiagFormat *)
 813         odr_malloc (assoc->encode, sizeof(*dr));
 814
 815     yaz_log(LOG_LOG, "[%d] %s %s%s", error, diagbib1_str(error),
 816         addinfo ? " -- " : "", addinfo ? addinfo : "");
 817     rec->which = Z_Records_NSD;
 818     rec->u.nonSurrogateDiagnostic = dr;
 819     dr->diagnosticSetId =
 820         yaz_oidval_to_z3950oid (assoc->encode, CLASS_DIAGSET, VAL_BIB1);
 821     dr->condition = err;
 822     set_addinfo (dr, addinfo, assoc->encode);
 823     return rec;
 824 }
 825
 826 /*
 827  * surrogate diagnostic.
 828  */
 829 static Z_NamePlusRecord *surrogatediagrec(association *assoc, char *dbname,
 830                                           int error, char *addinfo)
 831 {
 832     Z_NamePlusRecord *rec = (Z_NamePlusRecord *)
 833         odr_malloc (assoc->encode, sizeof(*rec));
 834     int *err = odr_intdup(assoc->encode, error);
 835     Z_DiagRec *drec = (Z_DiagRec *)odr_malloc (assoc->encode, sizeof(*drec));
 836     Z_DefaultDiagFormat *dr = (Z_DefaultDiagFormat *)
 837         odr_malloc (assoc->encode, sizeof(*dr));
 838
 839     yaz_log(LOG_DEBUG, "SurrogateDiagnotic: %d -- %s", error, addinfo);
 840     rec->databaseName = dbname;
 841     rec->which = Z_NamePlusRecord_surrogateDiagnostic;
 842     rec->u.surrogateDiagnostic = drec;
 843     drec->which = Z_DiagRec_defaultFormat;
 844     drec->u.defaultFormat = dr;
 845     dr->diagnosticSetId =
 846         yaz_oidval_to_z3950oid (assoc->encode, CLASS_DIAGSET, VAL_BIB1);
 847     dr->condition = err;
 848     set_addinfo (dr, addinfo, assoc->encode);
 849
 850     return rec;
 851 }
 852
 853 /*
 854  * multiple nonsurrogate diagnostics.
 855  */
 856 static Z_DiagRecs *diagrecs(association *assoc, int error, char *addinfo)
 857 {
 858     Z_DiagRecs *recs = (Z_DiagRecs *)odr_malloc (assoc->encode, sizeof(*recs));
 859     int *err = odr_intdup(assoc->encode, error);
 860     Z_DiagRec **recp = (Z_DiagRec **)odr_malloc (assoc->encode, sizeof(*recp));
 861     Z_DiagRec *drec = (Z_DiagRec *)odr_malloc (assoc->encode, sizeof(*drec));
 862     Z_DefaultDiagFormat *rec = (Z_DefaultDiagFormat *)
 863         odr_malloc (assoc->encode, sizeof(*rec));
 864
 865     yaz_log(LOG_DEBUG, "DiagRecs: %d -- %s", error, addinfo ? addinfo : "");
 866
 867     recs->num_diagRecs = 1;
 868     recs->diagRecs = recp;
 869     recp[0] = drec;
 870     drec->which = Z_DiagRec_defaultFormat;
 871     drec->u.defaultFormat = rec;
 872
 873     rec->diagnosticSetId =
 874         yaz_oidval_to_z3950oid (assoc->encode, CLASS_DIAGSET, VAL_BIB1);
 875     rec->condition = err;
 876
 877     rec->which = Z_DefaultDiagFormat_v2Addinfo;
 878     rec->u.v2Addinfo = odr_strdup (assoc->encode, addinfo ? addinfo : "");
 879     return recs;
 880 }
 881
 882 static Z_Records *pack_records(association *a, char *setname, int start,
 883                                int *num, Z_RecordComposition *comp,
 884                                int *next, int *pres, oid_value format,
 885                                Z_ReferenceId *referenceId,
 886                                int *oid)
 887 {
 888     int recno, total_length = 0, toget = *num, dumped_records = 0;
 889     Z_Records *records =
 890         (Z_Records *) odr_malloc (a->encode, sizeof(*records));
 891     Z_NamePlusRecordList *reclist =
 892         (Z_NamePlusRecordList *) odr_malloc (a->encode, sizeof(*reclist));
 893     Z_NamePlusRecord **list =
 894         (Z_NamePlusRecord **) odr_malloc (a->encode, sizeof(*list) * toget);
 895
 896     records->which = Z_Records_DBOSD;
 897     records->u.databaseOrSurDiagnostics = reclist;
 898     reclist->num_records = 0;
 899     reclist->records = list;
 900     *pres = Z_PRES_SUCCESS;
 901     *num = 0;
 902     *next = 0;
 903
 904     yaz_log(LOG_LOG, "Request to pack %d+%d+%s", start, toget, setname);
 905     yaz_log(LOG_DEBUG, "pms=%d, mrs=%d", a->preferredMessageSize,
 906         a->maximumRecordSize);
 907     for (recno = start; reclist->num_records < toget; recno++)
 908     {
 909         bend_fetch_rr freq;
 910         Z_NamePlusRecord *thisrec;
 911         int this_length = 0;
 912         /*
 913          * we get the number of bytes allocated on the stream before any
 914          * allocation done by the backend - this should give us a reasonable
 915          * idea of the total size of the data so far.
 916          */
 917         total_length = odr_total(a->encode) - dumped_records;
 918         freq.errcode = 0;
 919         freq.errstring = 0;
 920         freq.basename = 0;
 921         freq.len = 0;
 922         freq.record = 0;
 923         freq.last_in_set = 0;
 924         freq.setname = setname;
 925         freq.surrogate_flag = 0;
 926         freq.number = recno;
 927         freq.comp = comp;
 928         freq.request_format = format;
 929         freq.request_format_raw = oid;
 930         freq.output_format = format;
 931         freq.output_format_raw = 0;
 932         freq.stream = a->encode;
 933         freq.print = a->print;
 934         freq.surrogate_flag = 0;
 935         freq.referenceId = referenceId;
 936         (*a->init->bend_fetch)(a->backend, &freq);
 937         /* backend should be able to signal whether error is system-wide
 938            or only pertaining to current record */
 939         if (freq.errcode)
 940         {
 941             if (!freq.surrogate_flag)
 942             {
 943                 char s[20];
 944                 *pres = Z_PRES_FAILURE;
 945                 /* for 'present request out of range',
 946                    set addinfo to record position if not set */
 947                 if (freq.errcode == 13 && freq.errstring == 0)
 948                 {
 949                     sprintf (s, "%d", recno);
 950                     freq.errstring = s;
 951                 }
 952                 return diagrec(a, freq.errcode, freq.errstring);
 953             }
 954             reclist->records[reclist->num_records] =
 955                 surrogatediagrec(a, freq.basename, freq.errcode,
 956                                  freq.errstring);
 957             reclist->num_records++;
 958             *next = freq.last_in_set ? 0 : recno + 1;
 959             continue;
 960         }
 961         if (freq.len >= 0)
 962             this_length = freq.len;
 963         else
 964             this_length = odr_total(a->encode) - total_length;
 965         yaz_log(LOG_DEBUG, "  fetched record, len=%d, total=%d",
 966             this_length, total_length);
 967         if (this_length + total_length > a->preferredMessageSize)
 968         {
 969             /* record is small enough, really */
 970             if (this_length <= a->preferredMessageSize)
 971             {
 972                 yaz_log(LOG_DEBUG, "  Dropped last normal-sized record");
 973                 *pres = Z_PRES_PARTIAL_2;
 974                 break;
 975             }
 976             /* record can only be fetched by itself */
 977             if (this_length < a->maximumRecordSize)
 978             {
 979                 yaz_log(LOG_DEBUG, "  Record > prefmsgsz");
 980                 if (toget > 1)
 981                 {
 982                     yaz_log(LOG_DEBUG, "  Dropped it");
 983                     reclist->records[reclist->num_records] =
 984                          surrogatediagrec(a, freq.basename, 16, 0);
 985                     reclist->num_records++;
 986                     *next = freq.last_in_set ? 0 : recno + 1;
 987                     dumped_records += this_length;
 988                     continue;
 989                 }
 990             }
 991             else /* too big entirely */
 992             {
 993                 yaz_log(LOG_LOG, "Record > maxrcdsz this=%d max=%d", this_length, a->maximumRecordSize);
 994                 reclist->records[reclist->num_records] =
 995                     surrogatediagrec(a, freq.basename, 17, 0);
 996                 reclist->num_records++;
 997                 *next = freq.last_in_set ? 0 : recno + 1;
 998                 dumped_records += this_length;
 999                 continue;
1000             }
1001         }
1002
1003         if (!(thisrec = (Z_NamePlusRecord *)
1004               odr_malloc(a->encode, sizeof(*thisrec))))
1005             return 0;
1006         if (!(thisrec->databaseName = (char *)odr_malloc(a->encode,
1007             strlen(freq.basename) + 1)))
1008             return 0;
1009         strcpy(thisrec->databaseName, freq.basename);
1010         thisrec->which = Z_NamePlusRecord_databaseRecord;
1011
1012         if (freq.output_format_raw)
1013         {
1014             struct oident *ident = oid_getentbyoid(freq.output_format_raw);
1015             freq.output_format = ident->value;
1016         }
1017         thisrec->u.databaseRecord = z_ext_record(a->encode, freq.output_format,
1018                                                  freq.record, freq.len);
1019         if (!thisrec->u.databaseRecord)
1020             return 0;
1021         reclist->records[reclist->num_records] = thisrec;
1022         reclist->num_records++;
1023         *next = freq.last_in_set ? 0 : recno + 1;
1024     }
1025     *num = reclist->num_records;
1026     return records;
1027 }
1028
1029 static Z_APDU *process_searchRequest(association *assoc, request *reqb,
1030     int *fd)
1031 {
1032     Z_SearchRequest *req = reqb->apdu_request->u.searchRequest;
1033     bend_search_rr *bsrr =
1034         (bend_search_rr *)nmem_malloc (reqb->request_mem, sizeof(*bsrr));
1035
1036     yaz_log(LOG_LOG, "Got SearchRequest.");
1037     bsrr->fd = fd;
1038     bsrr->request = reqb;
1039     bsrr->association = assoc;
1040     bsrr->referenceId = req->referenceId;
1041     save_referenceId (reqb, bsrr->referenceId);
1042
1043     yaz_log (LOG_LOG, "ResultSet '%s'", req->resultSetName);
1044     if (req->databaseNames)
1045     {
1046         int i;
1047         for (i = 0; i < req->num_databaseNames; i++)
1048             yaz_log (LOG_LOG, "Database '%s'", req->databaseNames[i]);
1049     }
1050     yaz_log_zquery(req->query);
1051
1052     if (assoc->init->bend_search)
1053     {
1054         bsrr->setname = req->resultSetName;
1055         bsrr->replace_set = *req->replaceIndicator;
1056         bsrr->num_bases = req->num_databaseNames;
1057         bsrr->basenames = req->databaseNames;
1058         bsrr->query = req->query;
1059         bsrr->stream = assoc->encode;
1060         bsrr->decode = assoc->decode;
1061         bsrr->print = assoc->print;
1062         bsrr->errcode = 0;
1063         bsrr->hits = 0;
1064         bsrr->errstring = NULL;
1065         bsrr->search_info = NULL;
1066         (assoc->init->bend_search)(assoc->backend, bsrr);
1067         if (!bsrr->request)
1068             return 0;
1069     }
1070     return response_searchRequest(assoc, reqb, bsrr, fd);
1071 }
1072
1073 int bend_searchresponse(void *handle, bend_search_rr *bsrr) {return 0;}
1074
1075 /*
1076  * Prepare a searchresponse based on the backend results. We probably want
1077  * to look at making the fetching of records nonblocking as well, but
1078  * so far, we'll keep things simple.
1079  * If bsrt is null, that means we're called in response to a communications
1080  * event, and we'll have to get the response for ourselves.
1081  */
1082 static Z_APDU *response_searchRequest(association *assoc, request *reqb,
1083     bend_search_rr *bsrt, int *fd)
1084 {
1085     Z_SearchRequest *req = reqb->apdu_request->u.searchRequest;
1086     Z_APDU *apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1087     Z_SearchResponse *resp = (Z_SearchResponse *)
1088         odr_malloc (assoc->encode, sizeof(*resp));
1089     int *nulint = odr_intdup (assoc->encode, 0);
1090     bool_t *sr = odr_intdup(assoc->encode, 1);
1091     int *next = odr_intdup(assoc->encode, 0);
1092     int *none = odr_intdup(assoc->encode, Z_RES_NONE);
1093
1094     apdu->which = Z_APDU_searchResponse;
1095     apdu->u.searchResponse = resp;
1096     resp->referenceId = req->referenceId;
1097     resp->additionalSearchInfo = 0;
1098     resp->otherInfo = 0;
1099     *fd = -1;
1100     if (!bsrt && !bend_searchresponse(assoc->backend, bsrt))
1101     {
1102         yaz_log(LOG_FATAL, "Bad result from backend");
1103         return 0;
1104     }
1105     else if (bsrt->errcode)
1106     {
1107         resp->records = diagrec(assoc, bsrt->errcode, bsrt->errstring);
1108         resp->resultCount = nulint;
1109         resp->numberOfRecordsReturned = nulint;
1110         resp->nextResultSetPosition = nulint;
1111         resp->searchStatus = nulint;
1112         resp->resultSetStatus = none;
1113         resp->presentStatus = 0;
1114     }
1115     else
1116     {
1117         int *toget = odr_intdup(assoc->encode, 0);
1118         int *presst = odr_intdup(assoc->encode, 0);
1119         Z_RecordComposition comp, *compp = 0;
1120
1121         yaz_log (LOG_LOG, "resultCount: %d", bsrt->hits);
1122
1123         resp->records = 0;
1124         resp->resultCount = &bsrt->hits;
1125
1126         comp.which = Z_RecordComp_simple;
1127         /* how many records does the user agent want, then? */
1128         if (bsrt->hits <= *req->smallSetUpperBound)
1129         {
1130             *toget = bsrt->hits;
1131             if ((comp.u.simple = req->smallSetElementSetNames))
1132                 compp = &comp;
1133         }
1134         else if (bsrt->hits < *req->largeSetLowerBound)
1135         {
1136             *toget = *req->mediumSetPresentNumber;
1137             if (*toget > bsrt->hits)
1138                 *toget = bsrt->hits;
1139             if ((comp.u.simple = req->mediumSetElementSetNames))
1140                 compp = &comp;
1141         }
1142         else
1143             *toget = 0;
1144
1145         if (*toget && !resp->records)
1146         {
1147             oident *prefformat;
1148             oid_value form;
1149
1150             if (!(prefformat = oid_getentbyoid(req->preferredRecordSyntax)))
1151                 form = VAL_NONE;
1152             else
1153                 form = prefformat->value;
1154             resp->records = pack_records(assoc, req->resultSetName, 1,
1155                 toget, compp, next, presst, form, req->referenceId,
1156                                          req->preferredRecordSyntax);
1157             if (!resp->records)
1158                 return 0;
1159             resp->numberOfRecordsReturned = toget;
1160             resp->nextResultSetPosition = next;
1161             resp->searchStatus = sr;
1162             resp->resultSetStatus = 0;
1163             resp->presentStatus = presst;
1164         }
1165         else
1166         {
1167             if (*resp->resultCount)
1168                 *next = 1;
1169             resp->numberOfRecordsReturned = nulint;
1170             resp->nextResultSetPosition = next;
1171             resp->searchStatus = sr;
1172             resp->resultSetStatus = 0;
1173             resp->presentStatus = 0;
1174         }
1175     }
1176     resp->additionalSearchInfo = bsrt->search_info;
1177     return apdu;
1178 }
1179
1180 /*
1181  * Maybe we got a little over-friendly when we designed bend_fetch to
1182  * get only one record at a time. Some backends can optimise multiple-record
1183  * fetches, and at any rate, there is some overhead involved in
1184  * all that selecting and hopping around. Problem is, of course, that the
1185  * frontend can't know ahead of time how many records it'll need to
1186  * fill the negotiated PDU size. Annoying. Segmentation or not, Z/SR
1187  * is downright lousy as a bulk data transfer protocol.
1188  *
1189  * To start with, we'll do the fetching of records from the backend
1190  * in one operation: To save some trips in and out of the event-handler,
1191  * and to simplify the interface to pack_records. At any rate, asynch
1192  * operation is more fun in operations that have an unpredictable execution
1193  * speed - which is normally more true for search than for present.
1194  */
1195 static Z_APDU *process_presentRequest(association *assoc, request *reqb,
1196                                       int *fd)
1197 {
1198     Z_PresentRequest *req = reqb->apdu_request->u.presentRequest;
1199     oident *prefformat;
1200     oid_value form;
1201     Z_APDU *apdu;
1202     Z_PresentResponse *resp;
1203     int *next;
1204     int *num;
1205
1206     yaz_log(LOG_LOG, "Got PresentRequest.");
1207
1208     if (!(prefformat = oid_getentbyoid(req->preferredRecordSyntax)))
1209         form = VAL_NONE;
1210     else
1211         form = prefformat->value;
1212     resp = (Z_PresentResponse *)odr_malloc (assoc->encode, sizeof(*resp));
1213     resp->records = 0;
1214     resp->presentStatus = odr_intdup(assoc->encode, 0);
1215     if (assoc->init->bend_present)
1216     {
1217         bend_present_rr *bprr = (bend_present_rr *)
1218             nmem_malloc (reqb->request_mem, sizeof(*bprr));
1219         bprr->setname = req->resultSetId;
1220         bprr->start = *req->resultSetStartPoint;
1221         bprr->number = *req->numberOfRecordsRequested;
1222         bprr->format = form;
1223         bprr->comp = req->recordComposition;
1224         bprr->referenceId = req->referenceId;
1225         bprr->stream = assoc->encode;
1226         bprr->print = assoc->print;
1227         bprr->request = reqb;
1228         bprr->association = assoc;
1229         bprr->errcode = 0;
1230         bprr->errstring = NULL;
1231         (*assoc->init->bend_present)(assoc->backend, bprr);
1232
1233         if (!bprr->request)
1234             return 0;
1235         if (bprr->errcode)
1236         {
1237             resp->records = diagrec(assoc, bprr->errcode, bprr->errstring);
1238             *resp->presentStatus = Z_PRES_FAILURE;
1239         }
1240     }
1241     apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1242     next = odr_intdup(assoc->encode, 0);
1243     num = odr_intdup(assoc->encode, 0);
1244
1245     apdu->which = Z_APDU_presentResponse;
1246     apdu->u.presentResponse = resp;
1247     resp->referenceId = req->referenceId;
1248     resp->otherInfo = 0;
1249
1250     if (!resp->records)
1251     {
1252         *num = *req->numberOfRecordsRequested;
1253         resp->records =
1254             pack_records(assoc, req->resultSetId, *req->resultSetStartPoint,
1255                      num, req->recordComposition, next, resp->presentStatus,
1256                          form, req->referenceId, req->preferredRecordSyntax);
1257     }
1258     if (!resp->records)
1259         return 0;
1260     resp->numberOfRecordsReturned = num;
1261     resp->nextResultSetPosition = next;
1262
1263     return apdu;
1264 }
1265
1266 /*
1267  * Scan was implemented rather in a hurry, and with support for only the basic
1268  * elements of the service in the backend API. Suggestions are welcome.
1269  */
1270 static Z_APDU *process_scanRequest(association *assoc, request *reqb, int *fd)
1271 {
1272     Z_ScanRequest *req = reqb->apdu_request->u.scanRequest;
1273     Z_APDU *apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1274     Z_ScanResponse *res = (Z_ScanResponse *)
1275         odr_malloc (assoc->encode, sizeof(*res));
1276     int *scanStatus = odr_intdup(assoc->encode, Z_Scan_failure);
1277     int *numberOfEntriesReturned = odr_intdup(assoc->encode, 0);
1278     Z_ListEntries *ents = (Z_ListEntries *)
1279         odr_malloc (assoc->encode, sizeof(*ents));
1280     Z_DiagRecs *diagrecs_p = NULL;
1281     oident *attset;
1282     bend_scan_rr *bsrr = (bend_scan_rr *)
1283         odr_malloc (assoc->encode, sizeof(*bsrr));
1284
1285     yaz_log(LOG_LOG, "Got ScanRequest");
1286
1287     apdu->which = Z_APDU_scanResponse;
1288     apdu->u.scanResponse = res;
1289     res->referenceId = req->referenceId;
1290
1291     /* if step is absent, set it to 0 */
1292     res->stepSize = odr_intdup(assoc->encode, 0);
1293     if (req->stepSize)
1294         *res->stepSize = *req->stepSize;
1295
1296     res->scanStatus = scanStatus;
1297     res->numberOfEntriesReturned = numberOfEntriesReturned;
1298     res->positionOfTerm = 0;
1299     res->entries = ents;
1300     ents->num_entries = 0;
1301     ents->entries = NULL;
1302     ents->num_nonsurrogateDiagnostics = 0;
1303     ents->nonsurrogateDiagnostics = NULL;
1304     res->attributeSet = 0;
1305     res->otherInfo = 0;
1306
1307     if (req->databaseNames)
1308     {
1309         int i;
1310         for (i = 0; i < req->num_databaseNames; i++)
1311             yaz_log (LOG_LOG, "Database '%s'", req->databaseNames[i]);
1312     }
1313     bsrr->num_bases = req->num_databaseNames;
1314     bsrr->basenames = req->databaseNames;
1315     bsrr->num_entries = *req->numberOfTermsRequested;
1316     bsrr->term = req->termListAndStartPoint;
1317     bsrr->referenceId = req->referenceId;
1318     bsrr->stream = assoc->encode;
1319     bsrr->print = assoc->print;
1320     bsrr->step_size = res->stepSize;
1321     if (req->attributeSet &&
1322         (attset = oid_getentbyoid(req->attributeSet)) &&
1323         (attset->oclass == CLASS_ATTSET || attset->oclass == CLASS_GENERAL))
1324         bsrr->attributeset = attset->value;
1325     else
1326         bsrr->attributeset = VAL_NONE;
1327     log_scan_term (req->termListAndStartPoint, bsrr->attributeset);
1328     bsrr->term_position = req->preferredPositionInResponse ?
1329         *req->preferredPositionInResponse : 1;
1330     ((int (*)(void *, bend_scan_rr *))
1331      (*assoc->init->bend_scan))(assoc->backend, bsrr);
1332     if (bsrr->errcode)
1333         diagrecs_p = diagrecs(assoc, bsrr->errcode, bsrr->errstring);
1334     else
1335     {
1336         int i;
1337         Z_Entry **tab = (Z_Entry **)
1338             odr_malloc (assoc->encode, sizeof(*tab) * bsrr->num_entries);
1339
1340         if (bsrr->status == BEND_SCAN_PARTIAL)
1341             *scanStatus = Z_Scan_partial_5;
1342         else
1343             *scanStatus = Z_Scan_success;
1344         ents->entries = tab;
1345         ents->num_entries = bsrr->num_entries;
1346         res->numberOfEntriesReturned = &ents->num_entries;
1347         res->positionOfTerm = &bsrr->term_position;
1348         for (i = 0; i < bsrr->num_entries; i++)
1349         {
1350             Z_Entry *e;
1351             Z_TermInfo *t;
1352             Odr_oct *o;
1353
1354             tab[i] = e = (Z_Entry *)odr_malloc(assoc->encode, sizeof(*e));
1355             if (bsrr->entries[i].occurrences >= 0)
1356             {
1357                 e->which = Z_Entry_termInfo;
1358                 e->u.termInfo = t = (Z_TermInfo *)
1359                     odr_malloc(assoc->encode, sizeof(*t));
1360                 t->suggestedAttributes = 0;
1361                 t->displayTerm = 0;
1362                 t->alternativeTerm = 0;
1363                 t->byAttributes = 0;
1364                 t->otherTermInfo = 0;
1365                 t->globalOccurrences = &bsrr->entries[i].occurrences;
1366                 t->term = (Z_Term *)
1367                     odr_malloc(assoc->encode, sizeof(*t->term));
1368                 t->term->which = Z_Term_general;
1369                 t->term->u.general = o =
1370                     (Odr_oct *)odr_malloc(assoc->encode, sizeof(Odr_oct));
1371                 o->buf = (unsigned char *)
1372                     odr_malloc(assoc->encode, o->len = o->size =
1373                                strlen(bsrr->entries[i].term));
1374                 memcpy(o->buf, bsrr->entries[i].term, o->len);
1375                 yaz_log(LOG_DEBUG, "  term #%d: '%s' (%d)", i,
1376                          bsrr->entries[i].term, bsrr->entries[i].occurrences);
1377             }
1378             else
1379             {
1380                 Z_DiagRecs *drecs = diagrecs (assoc,
1381                                               bsrr->entries[i].errcode,
1382                                               bsrr->entries[i].errstring);
1383                 assert (drecs->num_diagRecs == 1);
1384                 e->which = Z_Entry_surrogateDiagnostic;
1385                 assert (drecs->diagRecs[0]);
1386                 e->u.surrogateDiagnostic = drecs->diagRecs[0];
1387             }
1388         }
1389     }
1390     if (diagrecs_p)
1391     {
1392         ents->num_nonsurrogateDiagnostics = diagrecs_p->num_diagRecs;
1393         ents->nonsurrogateDiagnostics = diagrecs_p->diagRecs;
1394     }
1395     return apdu;
1396 }
1397
1398 static Z_APDU *process_sortRequest(association *assoc, request *reqb,
1399     int *fd)
1400 {
1401     Z_SortRequest *req = reqb->apdu_request->u.sortRequest;
1402     Z_SortResponse *res = (Z_SortResponse *)
1403         odr_malloc (assoc->encode, sizeof(*res));
1404     bend_sort_rr *bsrr = (bend_sort_rr *)
1405         odr_malloc (assoc->encode, sizeof(*bsrr));
1406
1407     Z_APDU *apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1408
1409     yaz_log(LOG_LOG, "Got SortRequest.");
1410
1411     bsrr->num_input_setnames = req->num_inputResultSetNames;
1412     bsrr->input_setnames = req->inputResultSetNames;
1413     bsrr->referenceId = req->referenceId;
1414     bsrr->output_setname = req->sortedResultSetName;
1415     bsrr->sort_sequence = req->sortSequence;
1416     bsrr->stream = assoc->encode;
1417     bsrr->print = assoc->print;
1418
1419     bsrr->sort_status = Z_SortStatus_failure;
1420     bsrr->errcode = 0;
1421     bsrr->errstring = 0;
1422
1423     (*assoc->init->bend_sort)(assoc->backend, bsrr);
1424
1425     res->referenceId = bsrr->referenceId;
1426     res->sortStatus = odr_intdup(assoc->encode, bsrr->sort_status);
1427     res->resultSetStatus = 0;
1428     if (bsrr->errcode)
1429     {
1430         Z_DiagRecs *dr = diagrecs (assoc, bsrr->errcode, bsrr->errstring);
1431         res->diagnostics = dr->diagRecs;
1432         res->num_diagnostics = dr->num_diagRecs;
1433     }
1434     else
1435     {
1436         res->num_diagnostics = 0;
1437         res->diagnostics = 0;
1438     }
1439     res->otherInfo = 0;
1440
1441     apdu->which = Z_APDU_sortResponse;
1442     apdu->u.sortResponse = res;
1443     return apdu;
1444 }
1445
1446 static Z_APDU *process_deleteRequest(association *assoc, request *reqb,
1447     int *fd)
1448 {
1449     Z_DeleteResultSetRequest *req =
1450         reqb->apdu_request->u.deleteResultSetRequest;
1451     Z_DeleteResultSetResponse *res = (Z_DeleteResultSetResponse *)
1452         odr_malloc (assoc->encode, sizeof(*res));
1453     bend_delete_rr *bdrr = (bend_delete_rr *)
1454         odr_malloc (assoc->encode, sizeof(*bdrr));
1455     Z_APDU *apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1456
1457     yaz_log(LOG_LOG, "Got DeleteRequest.");
1458
1459     bdrr->num_setnames = req->num_resultSetList;
1460     bdrr->setnames = req->resultSetList;
1461     bdrr->stream = assoc->encode;
1462     bdrr->print = assoc->print;
1463     bdrr->function = *req->deleteFunction;
1464     bdrr->referenceId = req->referenceId;
1465     bdrr->statuses = 0;
1466     if (bdrr->num_setnames > 0)
1467     {
1468         int i;
1469         bdrr->statuses = (int*)
1470             odr_malloc(assoc->encode, sizeof(*bdrr->statuses) *
1471                        bdrr->num_setnames);
1472         for (i = 0; i < bdrr->num_setnames; i++)
1473             bdrr->statuses[i] = 0;
1474     }
1475     (*assoc->init->bend_delete)(assoc->backend, bdrr);
1476
1477     res->referenceId = req->referenceId;
1478
1479     res->deleteOperationStatus = odr_intdup(assoc->encode,bdrr->delete_status);
1480
1481     res->deleteListStatuses = 0;
1482     if (bdrr->num_setnames > 0)
1483     {
1484         int i;
1485         res->deleteListStatuses = (Z_ListStatuses *)
1486             odr_malloc(assoc->encode, sizeof(*res->deleteListStatuses));
1487         res->deleteListStatuses->num = bdrr->num_setnames;
1488         res->deleteListStatuses->elements =
1489             (Z_ListStatus **)
1490             odr_malloc (assoc->encode,
1491                         sizeof(*res->deleteListStatuses->elements) *
1492                         bdrr->num_setnames);
1493         for (i = 0; i<bdrr->num_setnames; i++)
1494         {
1495             res->deleteListStatuses->elements[i] =
1496                 (Z_ListStatus *)
1497                 odr_malloc (assoc->encode,
1498                             sizeof(**res->deleteListStatuses->elements));
1499             res->deleteListStatuses->elements[i]->status = bdrr->statuses+i;
1500             res->deleteListStatuses->elements[i]->id =
1501                 odr_strdup (assoc->encode, bdrr->setnames[i]);
1502
1503         }
1504     }
1505     res->numberNotDeleted = 0;
1506     res->bulkStatuses = 0;
1507     res->deleteMessage = 0;
1508     res->otherInfo = 0;
1509
1510     apdu->which = Z_APDU_deleteResultSetResponse;
1511     apdu->u.deleteResultSetResponse = res;
1512     return apdu;
1513 }
1514
1515 static void process_close(association *assoc, request *reqb)
1516 {
1517     Z_Close *req = reqb->apdu_request->u.close;
1518     static char *reasons[] =
1519     {
1520         "finished",
1521         "shutdown",
1522         "systemProblem",
1523         "costLimit",
1524         "resources",
1525         "securityViolation",
1526         "protocolError",
1527         "lackOfActivity",
1528         "peerAbort",
1529         "unspecified"
1530     };
1531
1532     yaz_log(LOG_LOG, "Got Close, reason %s, message %s",
1533         reasons[*req->closeReason], req->diagnosticInformation ?
1534         req->diagnosticInformation : "NULL");
1535     if (assoc->version < 3) /* to make do_force respond with close */
1536         assoc->version = 3;
1537     do_close_req(assoc, Z_Close_finished,
1538                  "Association terminated by client", reqb);
1539 }
1540
1541 void save_referenceId (request *reqb, Z_ReferenceId *refid)
1542 {
1543     if (refid)
1544     {
1545         reqb->len_refid = refid->len;
1546         reqb->refid = (char *)nmem_malloc (reqb->request_mem, refid->len);
1547         memcpy (reqb->refid, refid->buf, refid->len);
1548     }
1549     else
1550     {
1551         reqb->len_refid = 0;
1552         reqb->refid = NULL;
1553     }
1554 }
1555
1556 void bend_request_send (bend_association a, bend_request req, Z_APDU *res)
1557 {
1558     process_response (a, req, res);
1559 }
1560
1561 bend_request bend_request_mk (bend_association a)
1562 {
1563     request *nreq = request_get (&a->outgoing);
1564     nreq->request_mem = nmem_create ();
1565     return nreq;
1566 }
1567
1568 Z_ReferenceId *bend_request_getid (ODR odr, bend_request req)
1569 {
1570     Z_ReferenceId *id;
1571     if (!req->refid)
1572         return 0;
1573     id = (Odr_oct *)odr_malloc (odr, sizeof(*odr));
1574     id->buf = (unsigned char *)odr_malloc (odr, req->len_refid);
1575     id->len = id->size = req->len_refid;
1576     memcpy (id->buf, req->refid, req->len_refid);
1577     return id;
1578 }
1579
1580 void bend_request_destroy (bend_request *req)
1581 {
1582     nmem_destroy((*req)->request_mem);
1583     request_release(*req);
1584     *req = NULL;
1585 }
1586
1587 int bend_backend_respond (bend_association a, bend_request req)
1588 {
1589     char *msg;
1590     int r;
1591     r = process_request (a, req, &msg);
1592     if (r < 0)
1593         yaz_log (LOG_WARN, "%s", msg);
1594     return r;
1595 }
1596
1597 void bend_request_setdata(bend_request r, void *p)
1598 {
1599     r->clientData = p;
1600 }
1601
1602 void *bend_request_getdata(bend_request r)
1603 {
1604     return r->clientData;
1605 }
1606
1607 static Z_APDU *process_segmentRequest (association *assoc, request *reqb)
1608 {
1609     bend_segment_rr req;
1610
1611     req.segment = reqb->apdu_request->u.segmentRequest;
1612     req.stream = assoc->encode;
1613     req.decode = assoc->decode;
1614     req.print = assoc->print;
1615     req.association = assoc;
1616
1617     (*assoc->init->bend_segment)(assoc->backend, &req);
1618
1619     return 0;
1620 }
1621
1622 static Z_APDU *process_ESRequest(association *assoc, request *reqb, int *fd)
1623 {
1624     bend_esrequest_rr esrequest;
1625
1626     Z_ExtendedServicesRequest *req = reqb->apdu_request->u.extendedServicesRequest;
1627     Z_APDU *apdu = zget_APDU(assoc->encode, Z_APDU_extendedServicesResponse);
1628
1629     Z_ExtendedServicesResponse *resp = apdu->u.extendedServicesResponse;
1630
1631     yaz_log(LOG_DEBUG,"inside Process esRequest");
1632
1633     esrequest.esr = reqb->apdu_request->u.extendedServicesRequest;
1634     esrequest.stream = assoc->encode;
1635     esrequest.decode = assoc->decode;
1636     esrequest.print = assoc->print;
1637     esrequest.errcode = 0;
1638     esrequest.errstring = NULL;
1639     esrequest.request = reqb;
1640     esrequest.association = assoc;
1641     esrequest.taskPackage = 0;
1642     esrequest.referenceId = req->referenceId;
1643
1644     (*assoc->init->bend_esrequest)(assoc->backend, &esrequest);
1645
1646     /* If the response is being delayed, return NULL */
1647     if (esrequest.request == NULL)
1648         return(NULL);
1649
1650     resp->referenceId = req->referenceId;
1651
1652     if (esrequest.errcode == -1)
1653     {
1654         /* Backend service indicates request will be processed */
1655         yaz_log(LOG_DEBUG,"Request could be processed...Accepted !");
1656         *resp->operationStatus = Z_ExtendedServicesResponse_accepted;
1657     }
1658     else if (esrequest.errcode == 0)
1659     {
1660         /* Backend service indicates request will be processed */
1661         yaz_log(LOG_DEBUG,"Request could be processed...Done !");
1662         *resp->operationStatus = Z_ExtendedServicesResponse_done;
1663     }
1664     else
1665     {
1666         Z_DiagRecs *diagRecs = diagrecs (assoc, esrequest.errcode,
1667                                          esrequest.errstring);
1668
1669         /* Backend indicates error, request will not be processed */
1670         yaz_log(LOG_DEBUG,"Request could not be processed...failure !");
1671         *resp->operationStatus = Z_ExtendedServicesResponse_failure;
1672         resp->num_diagnostics = diagRecs->num_diagRecs;
1673         resp->diagnostics = diagRecs->diagRecs;
1674     }
1675     /* Do something with the members of bend_extendedservice */
1676     if (esrequest.taskPackage)
1677         resp->taskPackage = z_ext_record (assoc->encode, VAL_EXTENDED,
1678                                          (const char *)  esrequest.taskPackage,
1679                                           -1);
1680     yaz_log(LOG_DEBUG,"Send the result apdu");
1681     return apdu;
1682 }