server/seshigh.c

   1 /*
   2  * Copyright (c) 1995-2002, Index Data
   3  * See the file LICENSE for details.
   4  *
   5  * $Id: seshigh.c,v 1.132 2002-09-25 12:37:07 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     switch (req->query->which)
1051     {
1052     case Z_Query_type_1: case Z_Query_type_101:
1053         log_rpn_query (req->query->u.type_1);
1054     }
1055     if (assoc->init->bend_search)
1056     {
1057         bsrr->setname = req->resultSetName;
1058         bsrr->replace_set = *req->replaceIndicator;
1059         bsrr->num_bases = req->num_databaseNames;
1060         bsrr->basenames = req->databaseNames;
1061         bsrr->query = req->query;
1062         bsrr->stream = assoc->encode;
1063         bsrr->decode = assoc->decode;
1064         bsrr->print = assoc->print;
1065         bsrr->errcode = 0;
1066         bsrr->hits = 0;
1067         bsrr->errstring = NULL;
1068         bsrr->search_info = NULL;
1069         (assoc->init->bend_search)(assoc->backend, bsrr);
1070         if (!bsrr->request)
1071             return 0;
1072     }
1073     return response_searchRequest(assoc, reqb, bsrr, fd);
1074 }
1075
1076 int bend_searchresponse(void *handle, bend_search_rr *bsrr) {return 0;}
1077
1078 /*
1079  * Prepare a searchresponse based on the backend results. We probably want
1080  * to look at making the fetching of records nonblocking as well, but
1081  * so far, we'll keep things simple.
1082  * If bsrt is null, that means we're called in response to a communications
1083  * event, and we'll have to get the response for ourselves.
1084  */
1085 static Z_APDU *response_searchRequest(association *assoc, request *reqb,
1086     bend_search_rr *bsrt, int *fd)
1087 {
1088     Z_SearchRequest *req = reqb->apdu_request->u.searchRequest;
1089     Z_APDU *apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1090     Z_SearchResponse *resp = (Z_SearchResponse *)
1091         odr_malloc (assoc->encode, sizeof(*resp));
1092     int *nulint = odr_intdup (assoc->encode, 0);
1093     bool_t *sr = odr_intdup(assoc->encode, 1);
1094     int *next = odr_intdup(assoc->encode, 0);
1095     int *none = odr_intdup(assoc->encode, Z_RES_NONE);
1096
1097     apdu->which = Z_APDU_searchResponse;
1098     apdu->u.searchResponse = resp;
1099     resp->referenceId = req->referenceId;
1100     resp->additionalSearchInfo = 0;
1101     resp->otherInfo = 0;
1102     *fd = -1;
1103     if (!bsrt && !bend_searchresponse(assoc->backend, bsrt))
1104     {
1105         yaz_log(LOG_FATAL, "Bad result from backend");
1106         return 0;
1107     }
1108     else if (bsrt->errcode)
1109     {
1110         resp->records = diagrec(assoc, bsrt->errcode, bsrt->errstring);
1111         resp->resultCount = nulint;
1112         resp->numberOfRecordsReturned = nulint;
1113         resp->nextResultSetPosition = nulint;
1114         resp->searchStatus = nulint;
1115         resp->resultSetStatus = none;
1116         resp->presentStatus = 0;
1117     }
1118     else
1119     {
1120         int *toget = odr_intdup(assoc->encode, 0);
1121         int *presst = odr_intdup(assoc->encode, 0);
1122         Z_RecordComposition comp, *compp = 0;
1123
1124         yaz_log (LOG_LOG, "resultCount: %d", bsrt->hits);
1125
1126         resp->records = 0;
1127         resp->resultCount = &bsrt->hits;
1128
1129         comp.which = Z_RecordComp_simple;
1130         /* how many records does the user agent want, then? */
1131         if (bsrt->hits <= *req->smallSetUpperBound)
1132         {
1133             *toget = bsrt->hits;
1134             if ((comp.u.simple = req->smallSetElementSetNames))
1135                 compp = &comp;
1136         }
1137         else if (bsrt->hits < *req->largeSetLowerBound)
1138         {
1139             *toget = *req->mediumSetPresentNumber;
1140             if (*toget > bsrt->hits)
1141                 *toget = bsrt->hits;
1142             if ((comp.u.simple = req->mediumSetElementSetNames))
1143                 compp = &comp;
1144         }
1145         else
1146             *toget = 0;
1147
1148         if (*toget && !resp->records)
1149         {
1150             oident *prefformat;
1151             oid_value form;
1152
1153             if (!(prefformat = oid_getentbyoid(req->preferredRecordSyntax)))
1154                 form = VAL_NONE;
1155             else
1156                 form = prefformat->value;
1157             resp->records = pack_records(assoc, req->resultSetName, 1,
1158                 toget, compp, next, presst, form, req->referenceId,
1159                                          req->preferredRecordSyntax);
1160             if (!resp->records)
1161                 return 0;
1162             resp->numberOfRecordsReturned = toget;
1163             resp->nextResultSetPosition = next;
1164             resp->searchStatus = sr;
1165             resp->resultSetStatus = 0;
1166             resp->presentStatus = presst;
1167         }
1168         else
1169         {
1170             if (*resp->resultCount)
1171                 *next = 1;
1172             resp->numberOfRecordsReturned = nulint;
1173             resp->nextResultSetPosition = next;
1174             resp->searchStatus = sr;
1175             resp->resultSetStatus = 0;
1176             resp->presentStatus = 0;
1177         }
1178     }
1179     resp->additionalSearchInfo = bsrt->search_info;
1180     return apdu;
1181 }
1182
1183 /*
1184  * Maybe we got a little over-friendly when we designed bend_fetch to
1185  * get only one record at a time. Some backends can optimise multiple-record
1186  * fetches, and at any rate, there is some overhead involved in
1187  * all that selecting and hopping around. Problem is, of course, that the
1188  * frontend can't know ahead of time how many records it'll need to
1189  * fill the negotiated PDU size. Annoying. Segmentation or not, Z/SR
1190  * is downright lousy as a bulk data transfer protocol.
1191  *
1192  * To start with, we'll do the fetching of records from the backend
1193  * in one operation: To save some trips in and out of the event-handler,
1194  * and to simplify the interface to pack_records. At any rate, asynch
1195  * operation is more fun in operations that have an unpredictable execution
1196  * speed - which is normally more true for search than for present.
1197  */
1198 static Z_APDU *process_presentRequest(association *assoc, request *reqb,
1199                                       int *fd)
1200 {
1201     Z_PresentRequest *req = reqb->apdu_request->u.presentRequest;
1202     oident *prefformat;
1203     oid_value form;
1204     Z_APDU *apdu;
1205     Z_PresentResponse *resp;
1206     int *next;
1207     int *num;
1208
1209     yaz_log(LOG_LOG, "Got PresentRequest.");
1210
1211     if (!(prefformat = oid_getentbyoid(req->preferredRecordSyntax)))
1212         form = VAL_NONE;
1213     else
1214         form = prefformat->value;
1215     resp = (Z_PresentResponse *)odr_malloc (assoc->encode, sizeof(*resp));
1216     resp->records = 0;
1217     resp->presentStatus = odr_intdup(assoc->encode, 0);
1218     if (assoc->init->bend_present)
1219     {
1220         bend_present_rr *bprr = (bend_present_rr *)
1221             nmem_malloc (reqb->request_mem, sizeof(*bprr));
1222         bprr->setname = req->resultSetId;
1223         bprr->start = *req->resultSetStartPoint;
1224         bprr->number = *req->numberOfRecordsRequested;
1225         bprr->format = form;
1226         bprr->comp = req->recordComposition;
1227         bprr->referenceId = req->referenceId;
1228         bprr->stream = assoc->encode;
1229         bprr->print = assoc->print;
1230         bprr->request = reqb;
1231         bprr->association = assoc;
1232         bprr->errcode = 0;
1233         bprr->errstring = NULL;
1234         (*assoc->init->bend_present)(assoc->backend, bprr);
1235
1236         if (!bprr->request)
1237             return 0;
1238         if (bprr->errcode)
1239         {
1240             resp->records = diagrec(assoc, bprr->errcode, bprr->errstring);
1241             *resp->presentStatus = Z_PRES_FAILURE;
1242         }
1243     }
1244     apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1245     next = odr_intdup(assoc->encode, 0);
1246     num = odr_intdup(assoc->encode, 0);
1247
1248     apdu->which = Z_APDU_presentResponse;
1249     apdu->u.presentResponse = resp;
1250     resp->referenceId = req->referenceId;
1251     resp->otherInfo = 0;
1252
1253     if (!resp->records)
1254     {
1255         *num = *req->numberOfRecordsRequested;
1256         resp->records =
1257             pack_records(assoc, req->resultSetId, *req->resultSetStartPoint,
1258                      num, req->recordComposition, next, resp->presentStatus,
1259                          form, req->referenceId, req->preferredRecordSyntax);
1260     }
1261     if (!resp->records)
1262         return 0;
1263     resp->numberOfRecordsReturned = num;
1264     resp->nextResultSetPosition = next;
1265
1266     return apdu;
1267 }
1268
1269 /*
1270  * Scan was implemented rather in a hurry, and with support for only the basic
1271  * elements of the service in the backend API. Suggestions are welcome.
1272  */
1273 static Z_APDU *process_scanRequest(association *assoc, request *reqb, int *fd)
1274 {
1275     Z_ScanRequest *req = reqb->apdu_request->u.scanRequest;
1276     Z_APDU *apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1277     Z_ScanResponse *res = (Z_ScanResponse *)
1278         odr_malloc (assoc->encode, sizeof(*res));
1279     int *scanStatus = odr_intdup(assoc->encode, Z_Scan_failure);
1280     int *numberOfEntriesReturned = odr_intdup(assoc->encode, 0);
1281     Z_ListEntries *ents = (Z_ListEntries *)
1282         odr_malloc (assoc->encode, sizeof(*ents));
1283     Z_DiagRecs *diagrecs_p = NULL;
1284     oident *attset;
1285     bend_scan_rr *bsrr = (bend_scan_rr *)
1286         odr_malloc (assoc->encode, sizeof(*bsrr));
1287
1288     yaz_log(LOG_LOG, "Got ScanRequest");
1289
1290     apdu->which = Z_APDU_scanResponse;
1291     apdu->u.scanResponse = res;
1292     res->referenceId = req->referenceId;
1293
1294     /* if step is absent, set it to 0 */
1295     res->stepSize = odr_intdup(assoc->encode, 0);
1296     if (req->stepSize)
1297         *res->stepSize = *req->stepSize;
1298
1299     res->scanStatus = scanStatus;
1300     res->numberOfEntriesReturned = numberOfEntriesReturned;
1301     res->positionOfTerm = 0;
1302     res->entries = ents;
1303     ents->num_entries = 0;
1304     ents->entries = NULL;
1305     ents->num_nonsurrogateDiagnostics = 0;
1306     ents->nonsurrogateDiagnostics = NULL;
1307     res->attributeSet = 0;
1308     res->otherInfo = 0;
1309
1310     if (req->databaseNames)
1311     {
1312         int i;
1313         for (i = 0; i < req->num_databaseNames; i++)
1314             yaz_log (LOG_LOG, "Database '%s'", req->databaseNames[i]);
1315     }
1316     bsrr->num_bases = req->num_databaseNames;
1317     bsrr->basenames = req->databaseNames;
1318     bsrr->num_entries = *req->numberOfTermsRequested;
1319     bsrr->term = req->termListAndStartPoint;
1320     bsrr->referenceId = req->referenceId;
1321     bsrr->stream = assoc->encode;
1322     bsrr->print = assoc->print;
1323     bsrr->step_size = res->stepSize;
1324     if (req->attributeSet &&
1325         (attset = oid_getentbyoid(req->attributeSet)) &&
1326         (attset->oclass == CLASS_ATTSET || attset->oclass == CLASS_GENERAL))
1327         bsrr->attributeset = attset->value;
1328     else
1329         bsrr->attributeset = VAL_NONE;
1330     log_scan_term (req->termListAndStartPoint, bsrr->attributeset);
1331     bsrr->term_position = req->preferredPositionInResponse ?
1332         *req->preferredPositionInResponse : 1;
1333     ((int (*)(void *, bend_scan_rr *))
1334      (*assoc->init->bend_scan))(assoc->backend, bsrr);
1335     if (bsrr->errcode)
1336         diagrecs_p = diagrecs(assoc, bsrr->errcode, bsrr->errstring);
1337     else
1338     {
1339         int i;
1340         Z_Entry **tab = (Z_Entry **)
1341             odr_malloc (assoc->encode, sizeof(*tab) * bsrr->num_entries);
1342
1343         if (bsrr->status == BEND_SCAN_PARTIAL)
1344             *scanStatus = Z_Scan_partial_5;
1345         else
1346             *scanStatus = Z_Scan_success;
1347         ents->entries = tab;
1348         ents->num_entries = bsrr->num_entries;
1349         res->numberOfEntriesReturned = &ents->num_entries;
1350         res->positionOfTerm = &bsrr->term_position;
1351         for (i = 0; i < bsrr->num_entries; i++)
1352         {
1353             Z_Entry *e;
1354             Z_TermInfo *t;
1355             Odr_oct *o;
1356
1357             tab[i] = e = (Z_Entry *)odr_malloc(assoc->encode, sizeof(*e));
1358             if (bsrr->entries[i].occurrences >= 0)
1359             {
1360                 e->which = Z_Entry_termInfo;
1361                 e->u.termInfo = t = (Z_TermInfo *)
1362                     odr_malloc(assoc->encode, sizeof(*t));
1363                 t->suggestedAttributes = 0;
1364                 t->displayTerm = 0;
1365                 t->alternativeTerm = 0;
1366                 t->byAttributes = 0;
1367                 t->otherTermInfo = 0;
1368                 t->globalOccurrences = &bsrr->entries[i].occurrences;
1369                 t->term = (Z_Term *)
1370                     odr_malloc(assoc->encode, sizeof(*t->term));
1371                 t->term->which = Z_Term_general;
1372                 t->term->u.general = o =
1373                     (Odr_oct *)odr_malloc(assoc->encode, sizeof(Odr_oct));
1374                 o->buf = (unsigned char *)
1375                     odr_malloc(assoc->encode, o->len = o->size =
1376                                strlen(bsrr->entries[i].term));
1377                 memcpy(o->buf, bsrr->entries[i].term, o->len);
1378                 yaz_log(LOG_DEBUG, "  term #%d: '%s' (%d)", i,
1379                          bsrr->entries[i].term, bsrr->entries[i].occurrences);
1380             }
1381             else
1382             {
1383                 Z_DiagRecs *drecs = diagrecs (assoc,
1384                                               bsrr->entries[i].errcode,
1385                                               bsrr->entries[i].errstring);
1386                 assert (drecs->num_diagRecs == 1);
1387                 e->which = Z_Entry_surrogateDiagnostic;
1388                 assert (drecs->diagRecs[0]);
1389                 e->u.surrogateDiagnostic = drecs->diagRecs[0];
1390             }
1391         }
1392     }
1393     if (diagrecs_p)
1394     {
1395         ents->num_nonsurrogateDiagnostics = diagrecs_p->num_diagRecs;
1396         ents->nonsurrogateDiagnostics = diagrecs_p->diagRecs;
1397     }
1398     return apdu;
1399 }
1400
1401 static Z_APDU *process_sortRequest(association *assoc, request *reqb,
1402     int *fd)
1403 {
1404     Z_SortRequest *req = reqb->apdu_request->u.sortRequest;
1405     Z_SortResponse *res = (Z_SortResponse *)
1406         odr_malloc (assoc->encode, sizeof(*res));
1407     bend_sort_rr *bsrr = (bend_sort_rr *)
1408         odr_malloc (assoc->encode, sizeof(*bsrr));
1409
1410     Z_APDU *apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1411
1412     yaz_log(LOG_LOG, "Got SortRequest.");
1413
1414     bsrr->num_input_setnames = req->num_inputResultSetNames;
1415     bsrr->input_setnames = req->inputResultSetNames;
1416     bsrr->referenceId = req->referenceId;
1417     bsrr->output_setname = req->sortedResultSetName;
1418     bsrr->sort_sequence = req->sortSequence;
1419     bsrr->stream = assoc->encode;
1420     bsrr->print = assoc->print;
1421
1422     bsrr->sort_status = Z_SortStatus_failure;
1423     bsrr->errcode = 0;
1424     bsrr->errstring = 0;
1425
1426     (*assoc->init->bend_sort)(assoc->backend, bsrr);
1427
1428     res->referenceId = bsrr->referenceId;
1429     res->sortStatus = odr_intdup(assoc->encode, bsrr->sort_status);
1430     res->resultSetStatus = 0;
1431     if (bsrr->errcode)
1432     {
1433         Z_DiagRecs *dr = diagrecs (assoc, bsrr->errcode, bsrr->errstring);
1434         res->diagnostics = dr->diagRecs;
1435         res->num_diagnostics = dr->num_diagRecs;
1436     }
1437     else
1438     {
1439         res->num_diagnostics = 0;
1440         res->diagnostics = 0;
1441     }
1442     res->otherInfo = 0;
1443
1444     apdu->which = Z_APDU_sortResponse;
1445     apdu->u.sortResponse = res;
1446     return apdu;
1447 }
1448
1449 static Z_APDU *process_deleteRequest(association *assoc, request *reqb,
1450     int *fd)
1451 {
1452     Z_DeleteResultSetRequest *req =
1453         reqb->apdu_request->u.deleteResultSetRequest;
1454     Z_DeleteResultSetResponse *res = (Z_DeleteResultSetResponse *)
1455         odr_malloc (assoc->encode, sizeof(*res));
1456     bend_delete_rr *bdrr = (bend_delete_rr *)
1457         odr_malloc (assoc->encode, sizeof(*bdrr));
1458     Z_APDU *apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1459
1460     yaz_log(LOG_LOG, "Got DeleteRequest.");
1461
1462     bdrr->num_setnames = req->num_resultSetList;
1463     bdrr->setnames = req->resultSetList;
1464     bdrr->stream = assoc->encode;
1465     bdrr->print = assoc->print;
1466     bdrr->function = *req->deleteFunction;
1467     bdrr->referenceId = req->referenceId;
1468     bdrr->statuses = 0;
1469     if (bdrr->num_setnames > 0)
1470     {
1471         int i;
1472         bdrr->statuses = (int*)
1473             odr_malloc(assoc->encode, sizeof(*bdrr->statuses) *
1474                        bdrr->num_setnames);
1475         for (i = 0; i < bdrr->num_setnames; i++)
1476             bdrr->statuses[i] = 0;
1477     }
1478     (*assoc->init->bend_delete)(assoc->backend, bdrr);
1479
1480     res->referenceId = req->referenceId;
1481
1482     res->deleteOperationStatus = odr_intdup(assoc->encode,bdrr->delete_status);
1483
1484     res->deleteListStatuses = 0;
1485     if (bdrr->num_setnames > 0)
1486     {
1487         int i;
1488         res->deleteListStatuses = (Z_ListStatuses *)
1489             odr_malloc(assoc->encode, sizeof(*res->deleteListStatuses));
1490         res->deleteListStatuses->num = bdrr->num_setnames;
1491         res->deleteListStatuses->elements =
1492             (Z_ListStatus **)
1493             odr_malloc (assoc->encode,
1494                         sizeof(*res->deleteListStatuses->elements) *
1495                         bdrr->num_setnames);
1496         for (i = 0; i<bdrr->num_setnames; i++)
1497         {
1498             res->deleteListStatuses->elements[i] =
1499                 (Z_ListStatus *)
1500                 odr_malloc (assoc->encode,
1501                             sizeof(**res->deleteListStatuses->elements));
1502             res->deleteListStatuses->elements[i]->status = bdrr->statuses+i;
1503             res->deleteListStatuses->elements[i]->id =
1504                 odr_strdup (assoc->encode, bdrr->setnames[i]);
1505
1506         }
1507     }
1508     res->numberNotDeleted = 0;
1509     res->bulkStatuses = 0;
1510     res->deleteMessage = 0;
1511     res->otherInfo = 0;
1512
1513     apdu->which = Z_APDU_deleteResultSetResponse;
1514     apdu->u.deleteResultSetResponse = res;
1515     return apdu;
1516 }
1517
1518 static void process_close(association *assoc, request *reqb)
1519 {
1520     Z_Close *req = reqb->apdu_request->u.close;
1521     static char *reasons[] =
1522     {
1523         "finished",
1524         "shutdown",
1525         "systemProblem",
1526         "costLimit",
1527         "resources",
1528         "securityViolation",
1529         "protocolError",
1530         "lackOfActivity",
1531         "peerAbort",
1532         "unspecified"
1533     };
1534
1535     yaz_log(LOG_LOG, "Got Close, reason %s, message %s",
1536         reasons[*req->closeReason], req->diagnosticInformation ?
1537         req->diagnosticInformation : "NULL");
1538     if (assoc->version < 3) /* to make do_force respond with close */
1539         assoc->version = 3;
1540     do_close_req(assoc, Z_Close_finished,
1541                  "Association terminated by client", reqb);
1542 }
1543
1544 void save_referenceId (request *reqb, Z_ReferenceId *refid)
1545 {
1546     if (refid)
1547     {
1548         reqb->len_refid = refid->len;
1549         reqb->refid = (char *)nmem_malloc (reqb->request_mem, refid->len);
1550         memcpy (reqb->refid, refid->buf, refid->len);
1551     }
1552     else
1553     {
1554         reqb->len_refid = 0;
1555         reqb->refid = NULL;
1556     }
1557 }
1558
1559 void bend_request_send (bend_association a, bend_request req, Z_APDU *res)
1560 {
1561     process_response (a, req, res);
1562 }
1563
1564 bend_request bend_request_mk (bend_association a)
1565 {
1566     request *nreq = request_get (&a->outgoing);
1567     nreq->request_mem = nmem_create ();
1568     return nreq;
1569 }
1570
1571 Z_ReferenceId *bend_request_getid (ODR odr, bend_request req)
1572 {
1573     Z_ReferenceId *id;
1574     if (!req->refid)
1575         return 0;
1576     id = (Odr_oct *)odr_malloc (odr, sizeof(*odr));
1577     id->buf = (unsigned char *)odr_malloc (odr, req->len_refid);
1578     id->len = id->size = req->len_refid;
1579     memcpy (id->buf, req->refid, req->len_refid);
1580     return id;
1581 }
1582
1583 void bend_request_destroy (bend_request *req)
1584 {
1585     nmem_destroy((*req)->request_mem);
1586     request_release(*req);
1587     *req = NULL;
1588 }
1589
1590 int bend_backend_respond (bend_association a, bend_request req)
1591 {
1592     char *msg;
1593     int r;
1594     r = process_request (a, req, &msg);
1595     if (r < 0)
1596         logf (LOG_WARN, "%s", msg);
1597     return r;
1598 }
1599
1600 void bend_request_setdata(bend_request r, void *p)
1601 {
1602     r->clientData = p;
1603 }
1604
1605 void *bend_request_getdata(bend_request r)
1606 {
1607     return r->clientData;
1608 }
1609
1610 static Z_APDU *process_segmentRequest (association *assoc, request *reqb)
1611 {
1612     bend_segment_rr req;
1613
1614     req.segment = reqb->apdu_request->u.segmentRequest;
1615     req.stream = assoc->encode;
1616     req.decode = assoc->decode;
1617     req.print = assoc->print;
1618     req.association = assoc;
1619
1620     (*assoc->init->bend_segment)(assoc->backend, &req);
1621
1622     return 0;
1623 }
1624
1625 static Z_APDU *process_ESRequest(association *assoc, request *reqb, int *fd)
1626 {
1627     bend_esrequest_rr esrequest;
1628
1629     Z_ExtendedServicesRequest *req = reqb->apdu_request->u.extendedServicesRequest;
1630     Z_APDU *apdu = zget_APDU(assoc->encode, Z_APDU_extendedServicesResponse);
1631
1632     Z_ExtendedServicesResponse *resp = apdu->u.extendedServicesResponse;
1633
1634     yaz_log(LOG_DEBUG,"inside Process esRequest");
1635
1636     esrequest.esr = reqb->apdu_request->u.extendedServicesRequest;
1637     esrequest.stream = assoc->encode;
1638     esrequest.decode = assoc->decode;
1639     esrequest.print = assoc->print;
1640     esrequest.errcode = 0;
1641     esrequest.errstring = NULL;
1642     esrequest.request = reqb;
1643     esrequest.association = assoc;
1644     esrequest.taskPackage = 0;
1645     esrequest.referenceId = req->referenceId;
1646
1647     (*assoc->init->bend_esrequest)(assoc->backend, &esrequest);
1648
1649     /* If the response is being delayed, return NULL */
1650     if (esrequest.request == NULL)
1651         return(NULL);
1652
1653     resp->referenceId = req->referenceId;
1654
1655     if (esrequest.errcode == -1)
1656     {
1657         /* Backend service indicates request will be processed */
1658         yaz_log(LOG_DEBUG,"Request could be processed...Accepted !");
1659         *resp->operationStatus = Z_ExtendedServicesResponse_accepted;
1660     }
1661     else if (esrequest.errcode == 0)
1662     {
1663         /* Backend service indicates request will be processed */
1664         yaz_log(LOG_DEBUG,"Request could be processed...Done !");
1665         *resp->operationStatus = Z_ExtendedServicesResponse_done;
1666     }
1667     else
1668     {
1669         Z_DiagRecs *diagRecs = diagrecs (assoc, esrequest.errcode,
1670                                          esrequest.errstring);
1671
1672         /* Backend indicates error, request will not be processed */
1673         yaz_log(LOG_DEBUG,"Request could not be processed...failure !");
1674         *resp->operationStatus = Z_ExtendedServicesResponse_failure;
1675         resp->num_diagnostics = diagRecs->num_diagRecs;
1676         resp->diagnostics = diagRecs->diagRecs;
1677     }
1678     /* Do something with the members of bend_extendedservice */
1679     if (esrequest.taskPackage)
1680         resp->taskPackage = z_ext_record (assoc->encode, VAL_EXTENDED,
1681                                          (const char *)  esrequest.taskPackage,
1682                                           -1);
1683     yaz_log(LOG_DEBUG,"Send the result apdu");
1684     return apdu;
1685 }