server/seshigh.c

   1 /*
   2  * Copyright (c) 1995-2002, Index Data
   3  * See the file LICENSE for details.
   4  *
   5  * $Id: seshigh.c,v 1.130 2002-06-18 21:30:39 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
  50 #include <yaz/backend.h>
  51
  52 static int process_request(association *assoc, request *req, char **msg);
  53 void backend_response(IOCHAN i, int event);
  54 static int process_response(association *assoc, request *req, Z_APDU *res);
  55 static Z_APDU *process_initRequest(association *assoc, request *reqb);
  56 static Z_APDU *process_searchRequest(association *assoc, request *reqb,
  57     int *fd);
  58 static Z_APDU *response_searchRequest(association *assoc, request *reqb,
  59     bend_search_rr *bsrr, int *fd);
  60 static Z_APDU *process_presentRequest(association *assoc, request *reqb,
  61     int *fd);
  62 static Z_APDU *process_scanRequest(association *assoc, request *reqb, int *fd);
  63 static Z_APDU *process_sortRequest(association *assoc, request *reqb, int *fd);
  64 static void process_close(association *assoc, request *reqb);
  65 void save_referenceId (request *reqb, Z_ReferenceId *refid);
  66 static Z_APDU *process_deleteRequest(association *assoc, request *reqb,
  67     int *fd);
  68 static Z_APDU *process_segmentRequest (association *assoc, request *reqb);
  69
  70 static FILE *apduf = 0; /* for use in static mode */
  71 static statserv_options_block *control_block = 0;
  72
  73 /* Chas: Added in from DALI */
  74 static Z_APDU *process_ESRequest(association *assoc, request *reqb, int *fd);
  75 /* Chas: End of addition from DALI */
  76
  77 /*
  78  * Create and initialize a new association-handle.
  79  *  channel  : iochannel for the current line.
  80  *  link     : communications channel.
  81  * Returns: 0 or a new association handle.
  82  */
  83 association *create_association(IOCHAN channel, COMSTACK link)
  84 {
  85     association *anew;
  86
  87     if (!control_block)
  88         control_block = statserv_getcontrol();
  89     if (!(anew = (association *)xmalloc(sizeof(*anew))))
  90         return 0;
  91     anew->init = 0;
  92     anew->client_chan = channel;
  93     anew->client_link = link;
  94     anew->cs_get_mask = 0;
  95     anew->cs_put_mask = 0;
  96     anew->cs_accept_mask = 0;
  97     if (!(anew->decode = odr_createmem(ODR_DECODE)) ||
  98         !(anew->encode = odr_createmem(ODR_ENCODE)))
  99         return 0;
 100     if (*control_block->apdufile)
 101     {
 102         char filename[256];
 103         FILE *f;
 104
 105         strcpy(filename, control_block->apdufile);
 106         if (!(anew->print = odr_createmem(ODR_PRINT)))
 107             return 0;
 108         if (*control_block->apdufile != '-')
 109         {
 110             strcpy(filename, control_block->apdufile);
 111             if (!control_block->dynamic)
 112             {
 113                 if (!apduf)
 114                 {
 115                     if (!(apduf = fopen(filename, "w")))
 116                     {
 117                         yaz_log(LOG_WARN|LOG_ERRNO, "%s", filename);
 118                         return 0;
 119                     }
 120                     setvbuf(apduf, 0, _IONBF, 0);
 121                 }
 122                 f = apduf;
 123             }
 124             else
 125             {
 126                 sprintf(filename + strlen(filename), ".%d", getpid());
 127                 if (!(f = fopen(filename, "w")))
 128                 {
 129                     yaz_log(LOG_WARN|LOG_ERRNO, "%s", filename);
 130                     return 0;
 131                 }
 132                 setvbuf(f, 0, _IONBF, 0);
 133             }
 134             odr_setprint(anew->print, f);
 135         }
 136     }
 137     else
 138         anew->print = 0;
 139     anew->input_buffer = 0;
 140     anew->input_buffer_len = 0;
 141     anew->backend = 0;
 142     anew->state = ASSOC_NEW;
 143     request_initq(&anew->incoming);
 144     request_initq(&anew->outgoing);
 145     anew->proto = cs_getproto(link);
 146     return anew;
 147 }
 148
 149 /*
 150  * Free association and release resources.
 151  */
 152 void destroy_association(association *h)
 153 {
 154     statserv_options_block *cb = statserv_getcontrol();
 155
 156     xfree(h->init);
 157     odr_destroy(h->decode);
 158     odr_destroy(h->encode);
 159     if (h->print)
 160         odr_destroy(h->print);
 161     if (h->input_buffer)
 162     xfree(h->input_buffer);
 163     if (h->backend)
 164         (*cb->bend_close)(h->backend);
 165     while (request_deq(&h->incoming));
 166     while (request_deq(&h->outgoing));
 167     request_delq(&h->incoming);
 168     request_delq(&h->outgoing);
 169     xfree(h);
 170     xmalloc_trav("session closed");
 171     if (control_block && control_block->one_shot)
 172         exit (0);
 173 }
 174
 175 static void do_close_req(association *a, int reason, char *message,
 176                          request *req)
 177 {
 178     Z_APDU apdu;
 179     Z_Close *cls = zget_Close(a->encode);
 180
 181     /* Purge request queue */
 182     while (request_deq(&a->incoming));
 183     while (request_deq(&a->outgoing));
 184     if (a->version >= 3)
 185     {
 186         yaz_log(LOG_LOG, "Sending Close PDU, reason=%d, message=%s",
 187             reason, message ? message : "none");
 188         apdu.which = Z_APDU_close;
 189         apdu.u.close = cls;
 190         *cls->closeReason = reason;
 191         cls->diagnosticInformation = message;
 192         process_response(a, req, &apdu);
 193         iochan_settimeout(a->client_chan, 60);
 194     }
 195     else
 196     {
 197         yaz_log(LOG_DEBUG, "v2 client. No Close PDU");
 198         iochan_setevent(a->client_chan, EVENT_TIMEOUT); /* force imm close */
 199     }
 200     a->state = ASSOC_DEAD;
 201 }
 202
 203 static void do_close(association *a, int reason, char *message)
 204 {
 205     do_close_req (a, reason, message, request_get(&a->outgoing));
 206 }
 207
 208 /*
 209  * This is where PDUs from the client are read and the further
 210  * processing is initiated. Flow of control moves down through the
 211  * various process_* functions below, until the encoded result comes back up
 212  * to the output handler in here.
 213  *
 214  *  h     : the I/O channel that has an outstanding event.
 215  *  event : the current outstanding event.
 216  */
 217 void ir_session(IOCHAN h, int event)
 218 {
 219     int res;
 220     association *assoc = (association *)iochan_getdata(h);
 221     COMSTACK conn = assoc->client_link;
 222     request *req;
 223
 224     assert(h && conn && assoc);
 225     if (event == EVENT_TIMEOUT)
 226     {
 227         if (assoc->state != ASSOC_UP)
 228         {
 229             yaz_log(LOG_LOG, "Final timeout - closing connection.");
 230             cs_close(conn);
 231             destroy_association(assoc);
 232             iochan_destroy(h);
 233         }
 234         else
 235         {
 236             yaz_log(LOG_LOG, "Session idle too long. Sending close.");
 237             do_close(assoc, Z_Close_lackOfActivity, 0);
 238         }
 239         return;
 240     }
 241     if (event & assoc->cs_accept_mask)
 242     {
 243         yaz_log (LOG_DEBUG, "ir_session (accept)");
 244         if (!cs_accept (conn))
 245         {
 246             yaz_log (LOG_LOG, "accept failed");
 247             destroy_association(assoc);
 248             iochan_destroy(h);
 249         }
 250         iochan_clearflag (h, EVENT_OUTPUT|EVENT_OUTPUT);
 251         if (conn->io_pending)
 252         {   /* cs_accept didn't complete */
 253             assoc->cs_accept_mask =
 254                 ((conn->io_pending & CS_WANT_WRITE) ? EVENT_OUTPUT : 0) |
 255                 ((conn->io_pending & CS_WANT_READ) ? EVENT_INPUT : 0);
 256
 257             iochan_setflag (h, assoc->cs_accept_mask);
 258         }
 259         else
 260         {   /* cs_accept completed. Prepare for reading (cs_get) */
 261             assoc->cs_accept_mask = 0;
 262             assoc->cs_get_mask = EVENT_INPUT;
 263             iochan_setflag (h, assoc->cs_get_mask);
 264         }
 265         return;
 266     }
 267     if ((event & assoc->cs_get_mask) || (event & EVENT_WORK)) /* input */
 268     {
 269         if ((assoc->cs_put_mask & EVENT_INPUT) == 0 && (event & assoc->cs_get_mask))
 270         {
 271             yaz_log(LOG_DEBUG, "ir_session (input)");
 272             /* We aren't speaking to this fellow */
 273             if (assoc->state == ASSOC_DEAD)
 274             {
 275                 yaz_log(LOG_LOG, "Closed connection after reject");
 276                 cs_close(conn);
 277                 destroy_association(assoc);
 278                 iochan_destroy(h);
 279                 return;
 280             }
 281             assoc->cs_get_mask = EVENT_INPUT;
 282             if ((res = cs_get(conn, &assoc->input_buffer,
 283                 &assoc->input_buffer_len)) <= 0)
 284             {
 285                 yaz_log(LOG_LOG, "Connection closed by client");
 286                 cs_close(conn);
 287                 destroy_association(assoc);
 288                 iochan_destroy(h);
 289                 return;
 290             }
 291             else if (res == 1) /* incomplete read - wait for more  */
 292             {
 293                 if (conn->io_pending & CS_WANT_WRITE)
 294                     assoc->cs_get_mask |= EVENT_OUTPUT;
 295                 iochan_setflag(h, assoc->cs_get_mask);
 296                 return;
 297             }
 298             if (cs_more(conn)) /* more stuff - call us again later, please */
 299                 iochan_setevent(h, EVENT_INPUT);
 300
 301             /* we got a complete PDU. Let's decode it */
 302             yaz_log(LOG_DEBUG, "Got PDU, %d bytes", res);
 303             req = request_get(&assoc->incoming); /* get a new request structure */
 304             odr_reset(assoc->decode);
 305             odr_setbuf(assoc->decode, assoc->input_buffer, res, 0);
 306             if (!z_APDU(assoc->decode, &req->apdu_request, 0, 0))
 307             {
 308                 yaz_log(LOG_LOG, "ODR error on incoming PDU: %s [near byte %d] ",
 309                         odr_errmsg(odr_geterror(assoc->decode)),
 310                         odr_offset(assoc->decode));
 311                 yaz_log(LOG_LOG, "PDU dump:");
 312                 odr_dumpBER(yaz_log_file(), assoc->input_buffer, res);
 313                 do_close(assoc, Z_Close_protocolError, "Malformed package");
 314                 return;
 315             }
 316             req->request_mem = odr_extract_mem(assoc->decode);
 317             if (assoc->print && !z_APDU(assoc->print, &req->apdu_request, 0, 0))
 318             {
 319                 yaz_log(LOG_WARN, "ODR print error: %s",
 320                     odr_errmsg(odr_geterror(assoc->print)));
 321                 odr_reset(assoc->print);
 322             }
 323             request_enq(&assoc->incoming, req);
 324         }
 325
 326         /* can we do something yet? */
 327         req = request_head(&assoc->incoming);
 328         if (req->state == REQUEST_IDLE)
 329         {
 330             char *msg;
 331             request_deq(&assoc->incoming);
 332             if (process_request(assoc, req, &msg) < 0)
 333                 do_close_req(assoc, Z_Close_systemProblem, msg, req);
 334         }
 335     }
 336     if (event & assoc->cs_put_mask)
 337     {
 338         request *req = request_head(&assoc->outgoing);
 339
 340         assoc->cs_put_mask = 0;
 341         yaz_log(LOG_DEBUG, "ir_session (output)");
 342         req->state = REQUEST_PENDING;
 343         switch (res = cs_put(conn, req->response, req->len_response))
 344         {
 345         case -1:
 346             yaz_log(LOG_LOG, "Connection closed by client");
 347             cs_close(conn);
 348             destroy_association(assoc);
 349             iochan_destroy(h);
 350             break;
 351         case 0: /* all sent - release the request structure */
 352             yaz_log(LOG_DEBUG, "Wrote PDU, %d bytes", req->len_response);
 353             nmem_destroy(req->request_mem);
 354             request_deq(&assoc->outgoing);
 355             request_release(req);
 356             if (!request_head(&assoc->outgoing))
 357             {   /* restore mask for cs_get operation ... */
 358                 iochan_clearflag(h, EVENT_OUTPUT|EVENT_INPUT);
 359                 iochan_setflag(h, assoc->cs_get_mask);
 360             }
 361             break;
 362         default:
 363             if (conn->io_pending & CS_WANT_WRITE)
 364                 assoc->cs_put_mask |= EVENT_OUTPUT;
 365             if (conn->io_pending & CS_WANT_READ)
 366                 assoc->cs_put_mask |= EVENT_INPUT;
 367             iochan_setflag(h, assoc->cs_put_mask);
 368         }
 369     }
 370     if (event & EVENT_EXCEPT)
 371     {
 372         yaz_log(LOG_LOG, "ir_session (exception)");
 373         cs_close(conn);
 374         destroy_association(assoc);
 375         iochan_destroy(h);
 376     }
 377 }
 378
 379 /*
 380  * Initiate request processing.
 381  */
 382 static int process_request(association *assoc, request *req, char **msg)
 383 {
 384     int fd = -1;
 385     Z_APDU *res;
 386     int retval;
 387
 388     *msg = "Unknown Error";
 389     assert(req && req->state == REQUEST_IDLE);
 390     if (req->apdu_request->which != Z_APDU_initRequest && !assoc->init)
 391     {
 392         *msg = "Missing InitRequest";
 393         return -1;
 394     }
 395     switch (req->apdu_request->which)
 396     {
 397     case Z_APDU_initRequest:
 398         res = process_initRequest(assoc, req); break;
 399     case Z_APDU_searchRequest:
 400         res = process_searchRequest(assoc, req, &fd); break;
 401     case Z_APDU_presentRequest:
 402         res = process_presentRequest(assoc, req, &fd); break;
 403     case Z_APDU_scanRequest:
 404         if (assoc->init->bend_scan)
 405             res = process_scanRequest(assoc, req, &fd);
 406         else
 407         {
 408             *msg = "Cannot handle Scan APDU";
 409             return -1;
 410         }
 411         break;
 412     case Z_APDU_extendedServicesRequest:
 413         if (assoc->init->bend_esrequest)
 414             res = process_ESRequest(assoc, req, &fd);
 415         else
 416         {
 417             *msg = "Cannot handle Extended Services APDU";
 418             return -1;
 419         }
 420         break;
 421     case Z_APDU_sortRequest:
 422         if (assoc->init->bend_sort)
 423             res = process_sortRequest(assoc, req, &fd);
 424         else
 425         {
 426             *msg = "Cannot handle Sort APDU";
 427             return -1;
 428         }
 429         break;
 430     case Z_APDU_close:
 431         process_close(assoc, req);
 432         return 0;
 433     case Z_APDU_deleteResultSetRequest:
 434         if (assoc->init->bend_delete)
 435             res = process_deleteRequest(assoc, req, &fd);
 436         else
 437         {
 438             *msg = "Cannot handle Delete APDU";
 439             return -1;
 440         }
 441         break;
 442     case Z_APDU_segmentRequest:
 443         if (assoc->init->bend_segment)
 444         {
 445             res = process_segmentRequest (assoc, req);
 446         }
 447         else
 448         {
 449             *msg = "Cannot handle Segment APDU";
 450             return -1;
 451         }
 452         break;
 453     default:
 454         *msg = "Bad APDU received";
 455         return -1;
 456     }
 457     if (res)
 458     {
 459         yaz_log(LOG_DEBUG, "  result immediately available");
 460         retval = process_response(assoc, req, res);
 461     }
 462     else if (fd < 0)
 463     {
 464         yaz_log(LOG_DEBUG, "  result unavailble");
 465         retval = 0;
 466     }
 467     else /* no result yet - one will be provided later */
 468     {
 469         IOCHAN chan;
 470
 471         /* Set up an I/O handler for the fd supplied by the backend */
 472
 473         yaz_log(LOG_DEBUG, "   establishing handler for result");
 474         req->state = REQUEST_PENDING;
 475         if (!(chan = iochan_create(fd, backend_response, EVENT_INPUT)))
 476             abort();
 477         iochan_setdata(chan, assoc);
 478         retval = 0;
 479     }
 480     return retval;
 481 }
 482
 483 /*
 484  * Handle message from the backend.
 485  */
 486 void backend_response(IOCHAN i, int event)
 487 {
 488     association *assoc = (association *)iochan_getdata(i);
 489     request *req = request_head(&assoc->incoming);
 490     Z_APDU *res;
 491     int fd;
 492
 493     yaz_log(LOG_DEBUG, "backend_response");
 494     assert(assoc && req && req->state != REQUEST_IDLE);
 495     /* determine what it is we're waiting for */
 496     switch (req->apdu_request->which)
 497     {
 498         case Z_APDU_searchRequest:
 499             res = response_searchRequest(assoc, req, 0, &fd); break;
 500 #if 0
 501         case Z_APDU_presentRequest:
 502             res = response_presentRequest(assoc, req, 0, &fd); break;
 503         case Z_APDU_scanRequest:
 504             res = response_scanRequest(assoc, req, 0, &fd); break;
 505 #endif
 506         default:
 507             yaz_log(LOG_WARN, "Serious programmer's lapse or bug");
 508             abort();
 509     }
 510     if ((res && process_response(assoc, req, res) < 0) || fd < 0)
 511     {
 512         yaz_log(LOG_LOG, "Fatal error when talking to backend");
 513         do_close(assoc, Z_Close_systemProblem, 0);
 514         iochan_destroy(i);
 515         return;
 516     }
 517     else if (!res) /* no result yet - try again later */
 518     {
 519         yaz_log(LOG_DEBUG, "   no result yet");
 520         iochan_setfd(i, fd); /* in case fd has changed */
 521     }
 522 }
 523
 524 /*
 525  * Encode response, and transfer the request structure to the outgoing queue.
 526  */
 527 static int process_response(association *assoc, request *req, Z_APDU *res)
 528 {
 529     odr_setbuf(assoc->encode, req->response, req->size_response, 1);
 530
 531     if (assoc->print && !z_APDU(assoc->print, &res, 0, 0))
 532     {
 533         yaz_log(LOG_WARN, "ODR print error: %s",
 534             odr_errmsg(odr_geterror(assoc->print)));
 535         odr_reset(assoc->print);
 536     }
 537     if (!z_APDU(assoc->encode, &res, 0, 0))
 538     {
 539         yaz_log(LOG_WARN, "ODR error when encoding response: %s",
 540             odr_errmsg(odr_geterror(assoc->decode)));
 541         return -1;
 542     }
 543     req->response = odr_getbuf(assoc->encode, &req->len_response,
 544         &req->size_response);
 545     odr_setbuf(assoc->encode, 0, 0, 0); /* don'txfree if we abort later */
 546     odr_reset(assoc->encode);
 547     req->state = REQUEST_IDLE;
 548     request_enq(&assoc->outgoing, req);
 549     /* turn the work over to the ir_session handler */
 550     iochan_setflag(assoc->client_chan, EVENT_OUTPUT);
 551     assoc->cs_put_mask = EVENT_OUTPUT;
 552     /* Is there more work to be done? give that to the input handler too */
 553 #if 1
 554     if (request_head(&assoc->incoming))
 555     {
 556         yaz_log (LOG_DEBUG, "more work to be done");
 557         iochan_setevent(assoc->client_chan, EVENT_WORK);
 558     }
 559 #endif
 560     return 0;
 561 }
 562
 563 /*
 564  * Handle init request.
 565  * At the moment, we don't check the options
 566  * anywhere else in the code - we just try not to do anything that would
 567  * break a naive client. We'll toss 'em into the association block when
 568  * we need them there.
 569  */
 570 static Z_APDU *process_initRequest(association *assoc, request *reqb)
 571 {
 572     statserv_options_block *cb = statserv_getcontrol();
 573     Z_InitRequest *req = reqb->apdu_request->u.initRequest;
 574     Z_APDU *apdu = zget_APDU(assoc->encode, Z_APDU_initResponse);
 575     Z_InitResponse *resp = apdu->u.initResponse;
 576     bend_initresult *binitres;
 577     char options[100];
 578
 579     xfree (assoc->init);
 580     assoc->init = (bend_initrequest *) xmalloc (sizeof(*assoc->init));
 581
 582     yaz_log(LOG_LOG, "Got initRequest");
 583     if (req->implementationId)
 584         yaz_log(LOG_LOG, "Id:        %s", req->implementationId);
 585     if (req->implementationName)
 586         yaz_log(LOG_LOG, "Name:      %s", req->implementationName);
 587     if (req->implementationVersion)
 588         yaz_log(LOG_LOG, "Version:   %s", req->implementationVersion);
 589
 590     assoc->init->stream = assoc->encode;
 591     assoc->init->print = assoc->print;
 592     assoc->init->auth = req->idAuthentication;
 593     assoc->init->referenceId = req->referenceId;
 594     assoc->init->implementation_version = 0;
 595     assoc->init->implementation_id = 0;
 596     assoc->init->implementation_name = 0;
 597     assoc->init->bend_sort = NULL;
 598     assoc->init->bend_search = NULL;
 599     assoc->init->bend_present = NULL;
 600     assoc->init->bend_esrequest = NULL;
 601     assoc->init->bend_delete = NULL;
 602     assoc->init->bend_scan = NULL;
 603     assoc->init->bend_segment = NULL;
 604     assoc->init->bend_fetch = NULL;
 605
 606     assoc->init->peer_name =
 607         odr_strdup (assoc->encode, cs_addrstr(assoc->client_link));
 608     if (!(binitres = (*cb->bend_init)(assoc->init)))
 609     {
 610         yaz_log(LOG_WARN, "Bad response from backend.");
 611         return 0;
 612     }
 613
 614     assoc->backend = binitres->handle;
 615     if ((assoc->init->bend_sort))
 616         yaz_log (LOG_DEBUG, "Sort handler installed");
 617     if ((assoc->init->bend_search))
 618         yaz_log (LOG_DEBUG, "Search handler installed");
 619     if ((assoc->init->bend_present))
 620         yaz_log (LOG_DEBUG, "Present handler installed");
 621     if ((assoc->init->bend_esrequest))
 622         yaz_log (LOG_DEBUG, "ESRequest handler installed");
 623     if ((assoc->init->bend_delete))
 624         yaz_log (LOG_DEBUG, "Delete handler installed");
 625     if ((assoc->init->bend_scan))
 626         yaz_log (LOG_DEBUG, "Scan handler installed");
 627     if ((assoc->init->bend_segment))
 628         yaz_log (LOG_DEBUG, "Segment handler installed");
 629
 630     resp->referenceId = req->referenceId;
 631     *options = '\0';
 632     /* let's tell the client what we can do */
 633     if (ODR_MASK_GET(req->options, Z_Options_search))
 634     {
 635         ODR_MASK_SET(resp->options, Z_Options_search);
 636         strcat(options, "srch");
 637     }
 638     if (ODR_MASK_GET(req->options, Z_Options_present))
 639     {
 640         ODR_MASK_SET(resp->options, Z_Options_present);
 641         strcat(options, " prst");
 642     }
 643     if (ODR_MASK_GET(req->options, Z_Options_delSet) &&
 644         assoc->init->bend_delete)
 645     {
 646         ODR_MASK_SET(resp->options, Z_Options_delSet);
 647         strcat(options, " del");
 648     }
 649     if (ODR_MASK_GET(req->options, Z_Options_extendedServices) &&
 650         assoc->init->bend_esrequest)
 651     {
 652         ODR_MASK_SET(resp->options, Z_Options_extendedServices);
 653         strcat (options, " extendedServices");
 654     }
 655     if (ODR_MASK_GET(req->options, Z_Options_namedResultSets))
 656     {
 657         ODR_MASK_SET(resp->options, Z_Options_namedResultSets);
 658         strcat(options, " namedresults");
 659     }
 660     if (ODR_MASK_GET(req->options, Z_Options_scan) && assoc->init->bend_scan)
 661     {
 662         ODR_MASK_SET(resp->options, Z_Options_scan);
 663         strcat(options, " scan");
 664     }
 665     if (ODR_MASK_GET(req->options, Z_Options_concurrentOperations))
 666     {
 667         ODR_MASK_SET(resp->options, Z_Options_concurrentOperations);
 668         strcat(options, " concurop");
 669     }
 670     if (ODR_MASK_GET(req->options, Z_Options_sort) && assoc->init->bend_sort)
 671     {
 672         ODR_MASK_SET(resp->options, Z_Options_sort);
 673         strcat(options, " sort");
 674     }
 675     if (ODR_MASK_GET(req->protocolVersion, Z_ProtocolVersion_1))
 676     {
 677         ODR_MASK_SET(resp->protocolVersion, Z_ProtocolVersion_1);
 678         assoc->version = 2; /* 1 & 2 are equivalent */
 679     }
 680     if (ODR_MASK_GET(req->protocolVersion, Z_ProtocolVersion_2))
 681     {
 682         ODR_MASK_SET(resp->protocolVersion, Z_ProtocolVersion_2);
 683         assoc->version = 2;
 684     }
 685     if (ODR_MASK_GET(req->protocolVersion, Z_ProtocolVersion_3))
 686     {
 687         ODR_MASK_SET(resp->protocolVersion, Z_ProtocolVersion_3);
 688         assoc->version = 3;
 689     }
 690     yaz_log(LOG_LOG, "Negotiated to v%d: %s", assoc->version, options);
 691     assoc->maximumRecordSize = *req->maximumRecordSize;
 692     if (assoc->maximumRecordSize > control_block->maxrecordsize)
 693         assoc->maximumRecordSize = control_block->maxrecordsize;
 694     assoc->preferredMessageSize = *req->preferredMessageSize;
 695     if (assoc->preferredMessageSize > assoc->maximumRecordSize)
 696         assoc->preferredMessageSize = assoc->maximumRecordSize;
 697
 698 #if 0
 699     assoc->maximumRecordSize = 3000000;
 700     assoc->preferredMessageSize = 3000000;
 701 #endif
 702
 703     resp->preferredMessageSize = &assoc->preferredMessageSize;
 704     resp->maximumRecordSize = &assoc->maximumRecordSize;
 705
 706     resp->implementationName = "GFS/YAZ";
 707
 708     if (assoc->init->implementation_id)
 709     {
 710         char *nv = (char *)
 711             odr_malloc (assoc->encode,
 712                         strlen(assoc->init->implementation_id) + 10 +
 713                                strlen(resp->implementationId));
 714         sprintf (nv, "%s / %s",
 715                  resp->implementationId, assoc->init->implementation_id);
 716         resp->implementationId = nv;
 717     }
 718     if (assoc->init->implementation_name)
 719     {
 720         char *nv = (char *)
 721             odr_malloc (assoc->encode,
 722                         strlen(assoc->init->implementation_name) + 10 +
 723                                strlen(resp->implementationName));
 724         sprintf (nv, "%s / %s",
 725                  resp->implementationName, assoc->init->implementation_name);
 726         resp->implementationName = nv;
 727     }
 728     if (assoc->init->implementation_version)
 729     {
 730         char *nv = (char *)
 731             odr_malloc (assoc->encode,
 732                         strlen(assoc->init->implementation_version) + 10 +
 733                                strlen(resp->implementationVersion));
 734         sprintf (nv, "YAZ %s / %s",
 735                  resp->implementationVersion,
 736                  assoc->init->implementation_version);
 737         resp->implementationVersion = nv;
 738     }
 739
 740     if (binitres->errcode)
 741     {
 742         yaz_log(LOG_LOG, "Connection rejected by backend.");
 743         *resp->result = 0;
 744         assoc->state = ASSOC_DEAD;
 745     }
 746     else
 747         assoc->state = ASSOC_UP;
 748     return apdu;
 749 }
 750
 751 /*
 752  * These functions should be merged.
 753  */
 754
 755 static void set_addinfo (Z_DefaultDiagFormat *dr, char *addinfo, ODR odr)
 756 {
 757     dr->which = Z_DefaultDiagFormat_v2Addinfo;
 758     dr->u.v2Addinfo = odr_strdup (odr, addinfo ? addinfo : "");
 759 }
 760
 761 /*
 762  * nonsurrogate diagnostic record.
 763  */
 764 static Z_Records *diagrec(association *assoc, int error, char *addinfo)
 765 {
 766     Z_Records *rec = (Z_Records *)
 767         odr_malloc (assoc->encode, sizeof(*rec));
 768     int *err = odr_intdup(assoc->encode, error);
 769     Z_DiagRec *drec = (Z_DiagRec *)
 770         odr_malloc (assoc->encode, sizeof(*drec));
 771     Z_DefaultDiagFormat *dr = (Z_DefaultDiagFormat *)
 772         odr_malloc (assoc->encode, sizeof(*dr));
 773
 774     yaz_log(LOG_LOG, "[%d] %s %s%s", error, diagbib1_str(error),
 775         addinfo ? " -- " : "", addinfo ? addinfo : "");
 776     rec->which = Z_Records_NSD;
 777     rec->u.nonSurrogateDiagnostic = dr;
 778     dr->diagnosticSetId =
 779         yaz_oidval_to_z3950oid (assoc->encode, CLASS_DIAGSET, VAL_BIB1);
 780     dr->condition = err;
 781     set_addinfo (dr, addinfo, assoc->encode);
 782     return rec;
 783 }
 784
 785 /*
 786  * surrogate diagnostic.
 787  */
 788 static Z_NamePlusRecord *surrogatediagrec(association *assoc, char *dbname,
 789                                           int error, char *addinfo)
 790 {
 791     Z_NamePlusRecord *rec = (Z_NamePlusRecord *)
 792         odr_malloc (assoc->encode, sizeof(*rec));
 793     int *err = odr_intdup(assoc->encode, error);
 794     Z_DiagRec *drec = (Z_DiagRec *)odr_malloc (assoc->encode, sizeof(*drec));
 795     Z_DefaultDiagFormat *dr = (Z_DefaultDiagFormat *)
 796         odr_malloc (assoc->encode, sizeof(*dr));
 797
 798     yaz_log(LOG_DEBUG, "SurrogateDiagnotic: %d -- %s", error, addinfo);
 799     rec->databaseName = dbname;
 800     rec->which = Z_NamePlusRecord_surrogateDiagnostic;
 801     rec->u.surrogateDiagnostic = drec;
 802     drec->which = Z_DiagRec_defaultFormat;
 803     drec->u.defaultFormat = dr;
 804     dr->diagnosticSetId =
 805         yaz_oidval_to_z3950oid (assoc->encode, CLASS_DIAGSET, VAL_BIB1);
 806     dr->condition = err;
 807     set_addinfo (dr, addinfo, assoc->encode);
 808
 809     return rec;
 810 }
 811
 812 /*
 813  * multiple nonsurrogate diagnostics.
 814  */
 815 static Z_DiagRecs *diagrecs(association *assoc, int error, char *addinfo)
 816 {
 817     Z_DiagRecs *recs = (Z_DiagRecs *)odr_malloc (assoc->encode, sizeof(*recs));
 818     int *err = odr_intdup(assoc->encode, error);
 819     Z_DiagRec **recp = (Z_DiagRec **)odr_malloc (assoc->encode, sizeof(*recp));
 820     Z_DiagRec *drec = (Z_DiagRec *)odr_malloc (assoc->encode, sizeof(*drec));
 821     Z_DefaultDiagFormat *rec = (Z_DefaultDiagFormat *)
 822         odr_malloc (assoc->encode, sizeof(*rec));
 823
 824     yaz_log(LOG_DEBUG, "DiagRecs: %d -- %s", error, addinfo ? addinfo : "");
 825
 826     recs->num_diagRecs = 1;
 827     recs->diagRecs = recp;
 828     recp[0] = drec;
 829     drec->which = Z_DiagRec_defaultFormat;
 830     drec->u.defaultFormat = rec;
 831
 832     rec->diagnosticSetId =
 833         yaz_oidval_to_z3950oid (assoc->encode, CLASS_DIAGSET, VAL_BIB1);
 834     rec->condition = err;
 835
 836     rec->which = Z_DefaultDiagFormat_v2Addinfo;
 837     rec->u.v2Addinfo = odr_strdup (assoc->encode, addinfo ? addinfo : "");
 838     return recs;
 839 }
 840
 841 static Z_Records *pack_records(association *a, char *setname, int start,
 842                                int *num, Z_RecordComposition *comp,
 843                                int *next, int *pres, oid_value format,
 844                                Z_ReferenceId *referenceId,
 845                                int *oid)
 846 {
 847     int recno, total_length = 0, toget = *num, dumped_records = 0;
 848     Z_Records *records =
 849         (Z_Records *) odr_malloc (a->encode, sizeof(*records));
 850     Z_NamePlusRecordList *reclist =
 851         (Z_NamePlusRecordList *) odr_malloc (a->encode, sizeof(*reclist));
 852     Z_NamePlusRecord **list =
 853         (Z_NamePlusRecord **) odr_malloc (a->encode, sizeof(*list) * toget);
 854
 855     records->which = Z_Records_DBOSD;
 856     records->u.databaseOrSurDiagnostics = reclist;
 857     reclist->num_records = 0;
 858     reclist->records = list;
 859     *pres = Z_PRES_SUCCESS;
 860     *num = 0;
 861     *next = 0;
 862
 863     yaz_log(LOG_LOG, "Request to pack %d+%d+%s", start, toget, setname);
 864     yaz_log(LOG_DEBUG, "pms=%d, mrs=%d", a->preferredMessageSize,
 865         a->maximumRecordSize);
 866     for (recno = start; reclist->num_records < toget; recno++)
 867     {
 868         bend_fetch_rr freq;
 869         Z_NamePlusRecord *thisrec;
 870         int this_length = 0;
 871         /*
 872          * we get the number of bytes allocated on the stream before any
 873          * allocation done by the backend - this should give us a reasonable
 874          * idea of the total size of the data so far.
 875          */
 876         total_length = odr_total(a->encode) - dumped_records;
 877         freq.errcode = 0;
 878         freq.errstring = 0;
 879         freq.basename = 0;
 880         freq.len = 0;
 881         freq.record = 0;
 882         freq.last_in_set = 0;
 883         freq.setname = setname;
 884         freq.surrogate_flag = 0;
 885         freq.number = recno;
 886         freq.comp = comp;
 887         freq.request_format = format;
 888         freq.request_format_raw = oid;
 889         freq.output_format = format;
 890         freq.output_format_raw = 0;
 891         freq.stream = a->encode;
 892         freq.print = a->print;
 893         freq.surrogate_flag = 0;
 894         freq.referenceId = referenceId;
 895         (*a->init->bend_fetch)(a->backend, &freq);
 896         /* backend should be able to signal whether error is system-wide
 897            or only pertaining to current record */
 898         if (freq.errcode)
 899         {
 900             if (!freq.surrogate_flag)
 901             {
 902                 char s[20];
 903                 *pres = Z_PRES_FAILURE;
 904                 /* for 'present request out of range',
 905                    set addinfo to record position if not set */
 906                 if (freq.errcode == 13 && freq.errstring == 0)
 907                 {
 908                     sprintf (s, "%d", recno);
 909                     freq.errstring = s;
 910                 }
 911                 return diagrec(a, freq.errcode, freq.errstring);
 912             }
 913             reclist->records[reclist->num_records] =
 914                 surrogatediagrec(a, freq.basename, freq.errcode,
 915                                  freq.errstring);
 916             reclist->num_records++;
 917             *next = freq.last_in_set ? 0 : recno + 1;
 918             continue;
 919         }
 920         if (freq.len >= 0)
 921             this_length = freq.len;
 922         else
 923             this_length = odr_total(a->encode) - total_length;
 924         yaz_log(LOG_DEBUG, "  fetched record, len=%d, total=%d",
 925             this_length, total_length);
 926         if (this_length + total_length > a->preferredMessageSize)
 927         {
 928             /* record is small enough, really */
 929             if (this_length <= a->preferredMessageSize)
 930             {
 931                 yaz_log(LOG_DEBUG, "  Dropped last normal-sized record");
 932                 *pres = Z_PRES_PARTIAL_2;
 933                 break;
 934             }
 935             /* record can only be fetched by itself */
 936             if (this_length < a->maximumRecordSize)
 937             {
 938                 yaz_log(LOG_DEBUG, "  Record > prefmsgsz");
 939                 if (toget > 1)
 940                 {
 941                     yaz_log(LOG_DEBUG, "  Dropped it");
 942                     reclist->records[reclist->num_records] =
 943                          surrogatediagrec(a, freq.basename, 16, 0);
 944                     reclist->num_records++;
 945                     *next = freq.last_in_set ? 0 : recno + 1;
 946                     dumped_records += this_length;
 947                     continue;
 948                 }
 949             }
 950             else /* too big entirely */
 951             {
 952                 yaz_log(LOG_LOG, "Record > maxrcdsz this=%d max=%d", this_length, a->maximumRecordSize);
 953                 reclist->records[reclist->num_records] =
 954                     surrogatediagrec(a, freq.basename, 17, 0);
 955                 reclist->num_records++;
 956                 *next = freq.last_in_set ? 0 : recno + 1;
 957                 dumped_records += this_length;
 958                 continue;
 959             }
 960         }
 961
 962         if (!(thisrec = (Z_NamePlusRecord *)
 963               odr_malloc(a->encode, sizeof(*thisrec))))
 964             return 0;
 965         if (!(thisrec->databaseName = (char *)odr_malloc(a->encode,
 966             strlen(freq.basename) + 1)))
 967             return 0;
 968         strcpy(thisrec->databaseName, freq.basename);
 969         thisrec->which = Z_NamePlusRecord_databaseRecord;
 970
 971         if (freq.output_format_raw)
 972         {
 973             struct oident *ident = oid_getentbyoid(freq.output_format_raw);
 974             freq.output_format = ident->value;
 975         }
 976         thisrec->u.databaseRecord = z_ext_record(a->encode, freq.output_format,
 977                                                  freq.record, freq.len);
 978         if (!thisrec->u.databaseRecord)
 979             return 0;
 980         reclist->records[reclist->num_records] = thisrec;
 981         reclist->num_records++;
 982         *next = freq.last_in_set ? 0 : recno + 1;
 983     }
 984     *num = reclist->num_records;
 985     return records;
 986 }
 987
 988 static Z_APDU *process_searchRequest(association *assoc, request *reqb,
 989     int *fd)
 990 {
 991     Z_SearchRequest *req = reqb->apdu_request->u.searchRequest;
 992     bend_search_rr *bsrr =
 993         (bend_search_rr *)nmem_malloc (reqb->request_mem, sizeof(*bsrr));
 994
 995     yaz_log(LOG_LOG, "Got SearchRequest.");
 996     bsrr->fd = fd;
 997     bsrr->request = reqb;
 998     bsrr->association = assoc;
 999     bsrr->referenceId = req->referenceId;
1000     save_referenceId (reqb, bsrr->referenceId);
1001
1002     yaz_log (LOG_LOG, "ResultSet '%s'", req->resultSetName);
1003     if (req->databaseNames)
1004     {
1005         int i;
1006         for (i = 0; i < req->num_databaseNames; i++)
1007             yaz_log (LOG_LOG, "Database '%s'", req->databaseNames[i]);
1008     }
1009     switch (req->query->which)
1010     {
1011     case Z_Query_type_1: case Z_Query_type_101:
1012         log_rpn_query (req->query->u.type_1);
1013     }
1014     if (assoc->init->bend_search)
1015     {
1016         bsrr->setname = req->resultSetName;
1017         bsrr->replace_set = *req->replaceIndicator;
1018         bsrr->num_bases = req->num_databaseNames;
1019         bsrr->basenames = req->databaseNames;
1020         bsrr->query = req->query;
1021         bsrr->stream = assoc->encode;
1022         bsrr->decode = assoc->decode;
1023         bsrr->print = assoc->print;
1024         bsrr->errcode = 0;
1025         bsrr->hits = 0;
1026         bsrr->errstring = NULL;
1027         bsrr->search_info = NULL;
1028         (assoc->init->bend_search)(assoc->backend, bsrr);
1029         if (!bsrr->request)
1030             return 0;
1031     }
1032     return response_searchRequest(assoc, reqb, bsrr, fd);
1033 }
1034
1035 int bend_searchresponse(void *handle, bend_search_rr *bsrr) {return 0;}
1036
1037 /*
1038  * Prepare a searchresponse based on the backend results. We probably want
1039  * to look at making the fetching of records nonblocking as well, but
1040  * so far, we'll keep things simple.
1041  * If bsrt is null, that means we're called in response to a communications
1042  * event, and we'll have to get the response for ourselves.
1043  */
1044 static Z_APDU *response_searchRequest(association *assoc, request *reqb,
1045     bend_search_rr *bsrt, int *fd)
1046 {
1047     Z_SearchRequest *req = reqb->apdu_request->u.searchRequest;
1048     Z_APDU *apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1049     Z_SearchResponse *resp = (Z_SearchResponse *)
1050         odr_malloc (assoc->encode, sizeof(*resp));
1051     int *nulint = odr_intdup (assoc->encode, 0);
1052     bool_t *sr = odr_intdup(assoc->encode, 1);
1053     int *next = odr_intdup(assoc->encode, 0);
1054     int *none = odr_intdup(assoc->encode, Z_RES_NONE);
1055
1056     apdu->which = Z_APDU_searchResponse;
1057     apdu->u.searchResponse = resp;
1058     resp->referenceId = req->referenceId;
1059     resp->additionalSearchInfo = 0;
1060     resp->otherInfo = 0;
1061     *fd = -1;
1062     if (!bsrt && !bend_searchresponse(assoc->backend, bsrt))
1063     {
1064         yaz_log(LOG_FATAL, "Bad result from backend");
1065         return 0;
1066     }
1067     else if (bsrt->errcode)
1068     {
1069         resp->records = diagrec(assoc, bsrt->errcode, bsrt->errstring);
1070         resp->resultCount = nulint;
1071         resp->numberOfRecordsReturned = nulint;
1072         resp->nextResultSetPosition = nulint;
1073         resp->searchStatus = nulint;
1074         resp->resultSetStatus = none;
1075         resp->presentStatus = 0;
1076     }
1077     else
1078     {
1079         int *toget = odr_intdup(assoc->encode, 0);
1080         int *presst = odr_intdup(assoc->encode, 0);
1081         Z_RecordComposition comp, *compp = 0;
1082
1083         yaz_log (LOG_LOG, "resultCount: %d", bsrt->hits);
1084
1085         resp->records = 0;
1086         resp->resultCount = &bsrt->hits;
1087
1088         comp.which = Z_RecordComp_simple;
1089         /* how many records does the user agent want, then? */
1090         if (bsrt->hits <= *req->smallSetUpperBound)
1091         {
1092             *toget = bsrt->hits;
1093             if ((comp.u.simple = req->smallSetElementSetNames))
1094                 compp = &comp;
1095         }
1096         else if (bsrt->hits < *req->largeSetLowerBound)
1097         {
1098             *toget = *req->mediumSetPresentNumber;
1099             if (*toget > bsrt->hits)
1100                 *toget = bsrt->hits;
1101             if ((comp.u.simple = req->mediumSetElementSetNames))
1102                 compp = &comp;
1103         }
1104         else
1105             *toget = 0;
1106
1107         if (*toget && !resp->records)
1108         {
1109             oident *prefformat;
1110             oid_value form;
1111
1112             if (!(prefformat = oid_getentbyoid(req->preferredRecordSyntax)))
1113                 form = VAL_NONE;
1114             else
1115                 form = prefformat->value;
1116             resp->records = pack_records(assoc, req->resultSetName, 1,
1117                 toget, compp, next, presst, form, req->referenceId,
1118                                          req->preferredRecordSyntax);
1119             if (!resp->records)
1120                 return 0;
1121             resp->numberOfRecordsReturned = toget;
1122             resp->nextResultSetPosition = next;
1123             resp->searchStatus = sr;
1124             resp->resultSetStatus = 0;
1125             resp->presentStatus = presst;
1126         }
1127         else
1128         {
1129             if (*resp->resultCount)
1130                 *next = 1;
1131             resp->numberOfRecordsReturned = nulint;
1132             resp->nextResultSetPosition = next;
1133             resp->searchStatus = sr;
1134             resp->resultSetStatus = 0;
1135             resp->presentStatus = 0;
1136         }
1137     }
1138     resp->additionalSearchInfo = bsrt->search_info;
1139     return apdu;
1140 }
1141
1142 /*
1143  * Maybe we got a little over-friendly when we designed bend_fetch to
1144  * get only one record at a time. Some backends can optimise multiple-record
1145  * fetches, and at any rate, there is some overhead involved in
1146  * all that selecting and hopping around. Problem is, of course, that the
1147  * frontend can't know ahead of time how many records it'll need to
1148  * fill the negotiated PDU size. Annoying. Segmentation or not, Z/SR
1149  * is downright lousy as a bulk data transfer protocol.
1150  *
1151  * To start with, we'll do the fetching of records from the backend
1152  * in one operation: To save some trips in and out of the event-handler,
1153  * and to simplify the interface to pack_records. At any rate, asynch
1154  * operation is more fun in operations that have an unpredictable execution
1155  * speed - which is normally more true for search than for present.
1156  */
1157 static Z_APDU *process_presentRequest(association *assoc, request *reqb,
1158                                       int *fd)
1159 {
1160     Z_PresentRequest *req = reqb->apdu_request->u.presentRequest;
1161     oident *prefformat;
1162     oid_value form;
1163     Z_APDU *apdu;
1164     Z_PresentResponse *resp;
1165     int *next;
1166     int *num;
1167
1168     yaz_log(LOG_LOG, "Got PresentRequest.");
1169
1170     if (!(prefformat = oid_getentbyoid(req->preferredRecordSyntax)))
1171         form = VAL_NONE;
1172     else
1173         form = prefformat->value;
1174     resp = (Z_PresentResponse *)odr_malloc (assoc->encode, sizeof(*resp));
1175     resp->records = 0;
1176     resp->presentStatus = odr_intdup(assoc->encode, 0);
1177     if (assoc->init->bend_present)
1178     {
1179         bend_present_rr *bprr = (bend_present_rr *)
1180             nmem_malloc (reqb->request_mem, sizeof(*bprr));
1181         bprr->setname = req->resultSetId;
1182         bprr->start = *req->resultSetStartPoint;
1183         bprr->number = *req->numberOfRecordsRequested;
1184         bprr->format = form;
1185         bprr->comp = req->recordComposition;
1186         bprr->referenceId = req->referenceId;
1187         bprr->stream = assoc->encode;
1188         bprr->print = assoc->print;
1189         bprr->request = reqb;
1190         bprr->association = assoc;
1191         bprr->errcode = 0;
1192         bprr->errstring = NULL;
1193         (*assoc->init->bend_present)(assoc->backend, bprr);
1194
1195         if (!bprr->request)
1196             return 0;
1197         if (bprr->errcode)
1198         {
1199             resp->records = diagrec(assoc, bprr->errcode, bprr->errstring);
1200             *resp->presentStatus = Z_PRES_FAILURE;
1201         }
1202     }
1203     apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1204     next = odr_intdup(assoc->encode, 0);
1205     num = odr_intdup(assoc->encode, 0);
1206
1207     apdu->which = Z_APDU_presentResponse;
1208     apdu->u.presentResponse = resp;
1209     resp->referenceId = req->referenceId;
1210     resp->otherInfo = 0;
1211
1212     if (!resp->records)
1213     {
1214         *num = *req->numberOfRecordsRequested;
1215         resp->records =
1216             pack_records(assoc, req->resultSetId, *req->resultSetStartPoint,
1217                      num, req->recordComposition, next, resp->presentStatus,
1218                          form, req->referenceId, req->preferredRecordSyntax);
1219     }
1220     if (!resp->records)
1221         return 0;
1222     resp->numberOfRecordsReturned = num;
1223     resp->nextResultSetPosition = next;
1224
1225     return apdu;
1226 }
1227
1228 /*
1229  * Scan was implemented rather in a hurry, and with support for only the basic
1230  * elements of the service in the backend API. Suggestions are welcome.
1231  */
1232 static Z_APDU *process_scanRequest(association *assoc, request *reqb, int *fd)
1233 {
1234     Z_ScanRequest *req = reqb->apdu_request->u.scanRequest;
1235     Z_APDU *apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1236     Z_ScanResponse *res = (Z_ScanResponse *)
1237         odr_malloc (assoc->encode, sizeof(*res));
1238     int *scanStatus = odr_intdup(assoc->encode, Z_Scan_failure);
1239     int *numberOfEntriesReturned = odr_intdup(assoc->encode, 0);
1240     Z_ListEntries *ents = (Z_ListEntries *)
1241         odr_malloc (assoc->encode, sizeof(*ents));
1242     Z_DiagRecs *diagrecs_p = NULL;
1243     oident *attset;
1244     bend_scan_rr *bsrr = (bend_scan_rr *)
1245         odr_malloc (assoc->encode, sizeof(*bsrr));
1246
1247     yaz_log(LOG_LOG, "Got ScanRequest");
1248
1249     apdu->which = Z_APDU_scanResponse;
1250     apdu->u.scanResponse = res;
1251     res->referenceId = req->referenceId;
1252
1253     /* if step is absent, set it to 0 */
1254     res->stepSize = odr_intdup(assoc->encode, 0);
1255     if (req->stepSize)
1256         *res->stepSize = *req->stepSize;
1257
1258     res->scanStatus = scanStatus;
1259     res->numberOfEntriesReturned = numberOfEntriesReturned;
1260     res->positionOfTerm = 0;
1261     res->entries = ents;
1262     ents->num_entries = 0;
1263     ents->entries = NULL;
1264     ents->num_nonsurrogateDiagnostics = 0;
1265     ents->nonsurrogateDiagnostics = NULL;
1266     res->attributeSet = 0;
1267     res->otherInfo = 0;
1268
1269     if (req->databaseNames)
1270     {
1271         int i;
1272         for (i = 0; i < req->num_databaseNames; i++)
1273             yaz_log (LOG_LOG, "Database '%s'", req->databaseNames[i]);
1274     }
1275     bsrr->num_bases = req->num_databaseNames;
1276     bsrr->basenames = req->databaseNames;
1277     bsrr->num_entries = *req->numberOfTermsRequested;
1278     bsrr->term = req->termListAndStartPoint;
1279     bsrr->referenceId = req->referenceId;
1280     bsrr->stream = assoc->encode;
1281     bsrr->print = assoc->print;
1282     bsrr->step_size = res->stepSize;
1283     if (req->attributeSet &&
1284         (attset = oid_getentbyoid(req->attributeSet)) &&
1285         (attset->oclass == CLASS_ATTSET || attset->oclass == CLASS_GENERAL))
1286         bsrr->attributeset = attset->value;
1287     else
1288         bsrr->attributeset = VAL_NONE;
1289     log_scan_term (req->termListAndStartPoint, bsrr->attributeset);
1290     bsrr->term_position = req->preferredPositionInResponse ?
1291         *req->preferredPositionInResponse : 1;
1292     ((int (*)(void *, bend_scan_rr *))
1293      (*assoc->init->bend_scan))(assoc->backend, bsrr);
1294     if (bsrr->errcode)
1295         diagrecs_p = diagrecs(assoc, bsrr->errcode, bsrr->errstring);
1296     else
1297     {
1298         int i;
1299         Z_Entry **tab = (Z_Entry **)
1300             odr_malloc (assoc->encode, sizeof(*tab) * bsrr->num_entries);
1301
1302         if (bsrr->status == BEND_SCAN_PARTIAL)
1303             *scanStatus = Z_Scan_partial_5;
1304         else
1305             *scanStatus = Z_Scan_success;
1306         ents->entries = tab;
1307         ents->num_entries = bsrr->num_entries;
1308         res->numberOfEntriesReturned = &ents->num_entries;
1309         res->positionOfTerm = &bsrr->term_position;
1310         for (i = 0; i < bsrr->num_entries; i++)
1311         {
1312             Z_Entry *e;
1313             Z_TermInfo *t;
1314             Odr_oct *o;
1315
1316             tab[i] = e = (Z_Entry *)odr_malloc(assoc->encode, sizeof(*e));
1317             if (bsrr->entries[i].occurrences >= 0)
1318             {
1319                 e->which = Z_Entry_termInfo;
1320                 e->u.termInfo = t = (Z_TermInfo *)
1321                     odr_malloc(assoc->encode, sizeof(*t));
1322                 t->suggestedAttributes = 0;
1323                 t->displayTerm = 0;
1324                 t->alternativeTerm = 0;
1325                 t->byAttributes = 0;
1326                 t->otherTermInfo = 0;
1327                 t->globalOccurrences = &bsrr->entries[i].occurrences;
1328                 t->term = (Z_Term *)
1329                     odr_malloc(assoc->encode, sizeof(*t->term));
1330                 t->term->which = Z_Term_general;
1331                 t->term->u.general = o =
1332                     (Odr_oct *)odr_malloc(assoc->encode, sizeof(Odr_oct));
1333                 o->buf = (unsigned char *)
1334                     odr_malloc(assoc->encode, o->len = o->size =
1335                                strlen(bsrr->entries[i].term));
1336                 memcpy(o->buf, bsrr->entries[i].term, o->len);
1337                 yaz_log(LOG_DEBUG, "  term #%d: '%s' (%d)", i,
1338                          bsrr->entries[i].term, bsrr->entries[i].occurrences);
1339             }
1340             else
1341             {
1342                 Z_DiagRecs *drecs = diagrecs (assoc,
1343                                               bsrr->entries[i].errcode,
1344                                               bsrr->entries[i].errstring);
1345                 assert (drecs->num_diagRecs == 1);
1346                 e->which = Z_Entry_surrogateDiagnostic;
1347                 assert (drecs->diagRecs[0]);
1348                 e->u.surrogateDiagnostic = drecs->diagRecs[0];
1349             }
1350         }
1351     }
1352     if (diagrecs_p)
1353     {
1354         ents->num_nonsurrogateDiagnostics = diagrecs_p->num_diagRecs;
1355         ents->nonsurrogateDiagnostics = diagrecs_p->diagRecs;
1356     }
1357     return apdu;
1358 }
1359
1360 static Z_APDU *process_sortRequest(association *assoc, request *reqb,
1361     int *fd)
1362 {
1363     Z_SortRequest *req = reqb->apdu_request->u.sortRequest;
1364     Z_SortResponse *res = (Z_SortResponse *)
1365         odr_malloc (assoc->encode, sizeof(*res));
1366     bend_sort_rr *bsrr = (bend_sort_rr *)
1367         odr_malloc (assoc->encode, sizeof(*bsrr));
1368
1369     Z_APDU *apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1370
1371     yaz_log(LOG_LOG, "Got SortRequest.");
1372
1373     bsrr->num_input_setnames = req->num_inputResultSetNames;
1374     bsrr->input_setnames = req->inputResultSetNames;
1375     bsrr->referenceId = req->referenceId;
1376     bsrr->output_setname = req->sortedResultSetName;
1377     bsrr->sort_sequence = req->sortSequence;
1378     bsrr->stream = assoc->encode;
1379     bsrr->print = assoc->print;
1380
1381     bsrr->sort_status = Z_SortStatus_failure;
1382     bsrr->errcode = 0;
1383     bsrr->errstring = 0;
1384
1385     (*assoc->init->bend_sort)(assoc->backend, bsrr);
1386
1387     res->referenceId = bsrr->referenceId;
1388     res->sortStatus = odr_intdup(assoc->encode, bsrr->sort_status);
1389     res->resultSetStatus = 0;
1390     if (bsrr->errcode)
1391     {
1392         Z_DiagRecs *dr = diagrecs (assoc, bsrr->errcode, bsrr->errstring);
1393         res->diagnostics = dr->diagRecs;
1394         res->num_diagnostics = dr->num_diagRecs;
1395     }
1396     else
1397     {
1398         res->num_diagnostics = 0;
1399         res->diagnostics = 0;
1400     }
1401     res->otherInfo = 0;
1402
1403     apdu->which = Z_APDU_sortResponse;
1404     apdu->u.sortResponse = res;
1405     return apdu;
1406 }
1407
1408 static Z_APDU *process_deleteRequest(association *assoc, request *reqb,
1409     int *fd)
1410 {
1411     Z_DeleteResultSetRequest *req =
1412         reqb->apdu_request->u.deleteResultSetRequest;
1413     Z_DeleteResultSetResponse *res = (Z_DeleteResultSetResponse *)
1414         odr_malloc (assoc->encode, sizeof(*res));
1415     bend_delete_rr *bdrr = (bend_delete_rr *)
1416         odr_malloc (assoc->encode, sizeof(*bdrr));
1417     Z_APDU *apdu = (Z_APDU *)odr_malloc (assoc->encode, sizeof(*apdu));
1418
1419     yaz_log(LOG_LOG, "Got DeleteRequest.");
1420
1421     bdrr->num_setnames = req->num_resultSetList;
1422     bdrr->setnames = req->resultSetList;
1423     bdrr->stream = assoc->encode;
1424     bdrr->print = assoc->print;
1425     bdrr->function = *req->deleteFunction;
1426     bdrr->referenceId = req->referenceId;
1427     bdrr->statuses = 0;
1428     if (bdrr->num_setnames > 0)
1429     {
1430         int i;
1431         bdrr->statuses = (int*)
1432             odr_malloc(assoc->encode, sizeof(*bdrr->statuses) *
1433                        bdrr->num_setnames);
1434         for (i = 0; i < bdrr->num_setnames; i++)
1435             bdrr->statuses[i] = 0;
1436     }
1437     (*assoc->init->bend_delete)(assoc->backend, bdrr);
1438
1439     res->referenceId = req->referenceId;
1440
1441     res->deleteOperationStatus = odr_intdup(assoc->encode,bdrr->delete_status);
1442
1443     res->deleteListStatuses = 0;
1444     if (bdrr->num_setnames > 0)
1445     {
1446         int i;
1447         res->deleteListStatuses = (Z_ListStatuses *)
1448             odr_malloc(assoc->encode, sizeof(*res->deleteListStatuses));
1449         res->deleteListStatuses->num = bdrr->num_setnames;
1450         res->deleteListStatuses->elements =
1451             (Z_ListStatus **)
1452             odr_malloc (assoc->encode,
1453                         sizeof(*res->deleteListStatuses->elements) *
1454                         bdrr->num_setnames);
1455         for (i = 0; i<bdrr->num_setnames; i++)
1456         {
1457             res->deleteListStatuses->elements[i] =
1458                 (Z_ListStatus *)
1459                 odr_malloc (assoc->encode,
1460                             sizeof(**res->deleteListStatuses->elements));
1461             res->deleteListStatuses->elements[i]->status = bdrr->statuses+i;
1462             res->deleteListStatuses->elements[i]->id =
1463                 odr_strdup (assoc->encode, bdrr->setnames[i]);
1464
1465         }
1466     }
1467     res->numberNotDeleted = 0;
1468     res->bulkStatuses = 0;
1469     res->deleteMessage = 0;
1470     res->otherInfo = 0;
1471
1472     apdu->which = Z_APDU_deleteResultSetResponse;
1473     apdu->u.deleteResultSetResponse = res;
1474     return apdu;
1475 }
1476
1477 static void process_close(association *assoc, request *reqb)
1478 {
1479     Z_Close *req = reqb->apdu_request->u.close;
1480     static char *reasons[] =
1481     {
1482         "finished",
1483         "shutdown",
1484         "systemProblem",
1485         "costLimit",
1486         "resources",
1487         "securityViolation",
1488         "protocolError",
1489         "lackOfActivity",
1490         "peerAbort",
1491         "unspecified"
1492     };
1493
1494     yaz_log(LOG_LOG, "Got Close, reason %s, message %s",
1495         reasons[*req->closeReason], req->diagnosticInformation ?
1496         req->diagnosticInformation : "NULL");
1497     if (assoc->version < 3) /* to make do_force respond with close */
1498         assoc->version = 3;
1499     do_close_req(assoc, Z_Close_finished,
1500                  "Association terminated by client", reqb);
1501 }
1502
1503 void save_referenceId (request *reqb, Z_ReferenceId *refid)
1504 {
1505     if (refid)
1506     {
1507         reqb->len_refid = refid->len;
1508         reqb->refid = (char *)nmem_malloc (reqb->request_mem, refid->len);
1509         memcpy (reqb->refid, refid->buf, refid->len);
1510     }
1511     else
1512     {
1513         reqb->len_refid = 0;
1514         reqb->refid = NULL;
1515     }
1516 }
1517
1518 void bend_request_send (bend_association a, bend_request req, Z_APDU *res)
1519 {
1520     process_response (a, req, res);
1521 }
1522
1523 bend_request bend_request_mk (bend_association a)
1524 {
1525     request *nreq = request_get (&a->outgoing);
1526     nreq->request_mem = nmem_create ();
1527     return nreq;
1528 }
1529
1530 Z_ReferenceId *bend_request_getid (ODR odr, bend_request req)
1531 {
1532     Z_ReferenceId *id;
1533     if (!req->refid)
1534         return 0;
1535     id = (Odr_oct *)odr_malloc (odr, sizeof(*odr));
1536     id->buf = (unsigned char *)odr_malloc (odr, req->len_refid);
1537     id->len = id->size = req->len_refid;
1538     memcpy (id->buf, req->refid, req->len_refid);
1539     return id;
1540 }
1541
1542 void bend_request_destroy (bend_request *req)
1543 {
1544     nmem_destroy((*req)->request_mem);
1545     request_release(*req);
1546     *req = NULL;
1547 }
1548
1549 int bend_backend_respond (bend_association a, bend_request req)
1550 {
1551     char *msg;
1552     int r;
1553     r = process_request (a, req, &msg);
1554     if (r < 0)
1555         logf (LOG_WARN, "%s", msg);
1556     return r;
1557 }
1558
1559 void bend_request_setdata(bend_request r, void *p)
1560 {
1561     r->clientData = p;
1562 }
1563
1564 void *bend_request_getdata(bend_request r)
1565 {
1566     return r->clientData;
1567 }
1568
1569 static Z_APDU *process_segmentRequest (association *assoc, request *reqb)
1570 {
1571     bend_segment_rr req;
1572
1573     req.segment = reqb->apdu_request->u.segmentRequest;
1574     req.stream = assoc->encode;
1575     req.decode = assoc->decode;
1576     req.print = assoc->print;
1577     req.association = assoc;
1578
1579     (*assoc->init->bend_segment)(assoc->backend, &req);
1580
1581     return 0;
1582 }
1583
1584 static Z_APDU *process_ESRequest(association *assoc, request *reqb, int *fd)
1585 {
1586     bend_esrequest_rr esrequest;
1587
1588     Z_ExtendedServicesRequest *req = reqb->apdu_request->u.extendedServicesRequest;
1589     Z_APDU *apdu = zget_APDU(assoc->encode, Z_APDU_extendedServicesResponse);
1590
1591     Z_ExtendedServicesResponse *resp = apdu->u.extendedServicesResponse;
1592
1593     yaz_log(LOG_DEBUG,"inside Process esRequest");
1594
1595     esrequest.esr = reqb->apdu_request->u.extendedServicesRequest;
1596     esrequest.stream = assoc->encode;
1597     esrequest.decode = assoc->decode;
1598     esrequest.print = assoc->print;
1599     esrequest.errcode = 0;
1600     esrequest.errstring = NULL;
1601     esrequest.request = reqb;
1602     esrequest.association = assoc;
1603     esrequest.taskPackage = 0;
1604     esrequest.referenceId = req->referenceId;
1605
1606     (*assoc->init->bend_esrequest)(assoc->backend, &esrequest);
1607
1608     /* If the response is being delayed, return NULL */
1609     if (esrequest.request == NULL)
1610         return(NULL);
1611
1612     resp->referenceId = req->referenceId;
1613
1614     if (esrequest.errcode == -1)
1615     {
1616         /* Backend service indicates request will be processed */
1617         yaz_log(LOG_DEBUG,"Request could be processed...Accepted !");
1618         *resp->operationStatus = Z_ExtendedServicesResponse_accepted;
1619     }
1620     else if (esrequest.errcode == 0)
1621     {
1622         /* Backend service indicates request will be processed */
1623         yaz_log(LOG_DEBUG,"Request could be processed...Done !");
1624         *resp->operationStatus = Z_ExtendedServicesResponse_done;
1625     }
1626     else
1627     {
1628         Z_DiagRecs *diagRecs = diagrecs (assoc, esrequest.errcode,
1629                                          esrequest.errstring);
1630
1631         /* Backend indicates error, request will not be processed */
1632         yaz_log(LOG_DEBUG,"Request could not be processed...failure !");
1633         *resp->operationStatus = Z_ExtendedServicesResponse_failure;
1634         resp->num_diagnostics = diagRecs->num_diagRecs;
1635         resp->diagnostics = diagRecs->diagRecs;
1636     }
1637     /* Do something with the members of bend_extendedservice */
1638     if (esrequest.taskPackage)
1639         resp->taskPackage = z_ext_record (assoc->encode, VAL_EXTENDED,
1640                                          (const char *)  esrequest.taskPackage,
1641                                           -1);
1642     yaz_log(LOG_DEBUG,"Send the result apdu");
1643     return apdu;
1644 }