src/yaz-proxy.cpp

   1 /*
   2  * Copyright (c) 1998-2004, Index Data.
   3  * See the file LICENSE for details.
   4  *
   5  * $Id: yaz-proxy.cpp,v 1.77 2004-01-06 21:17:42 adam Exp $
   6  */
   7
   8 #include <assert.h>
   9 #include <time.h>
  10
  11 #include <yaz/srw.h>
  12 #include <yaz/marcdisp.h>
  13 #include <yaz/yaz-iconv.h>
  14 #include <yaz/log.h>
  15 #include <yaz/diagbib1.h>
  16 #include <yaz++/proxy.h>
  17 #include <yaz/pquery.h>
  18
  19 #if HAVE_XSLT
  20 #include <libxslt/xsltutils.h>
  21 #include <libxslt/transform.h>
  22 #endif
  23
  24 static const char *apdu_name(Z_APDU *apdu)
  25 {
  26     switch (apdu->which)
  27     {
  28     case Z_APDU_initRequest:
  29         return "initRequest";
  30     case Z_APDU_initResponse:
  31         return "initResponse";
  32     case Z_APDU_searchRequest:
  33         return "searchRequest";
  34     case Z_APDU_searchResponse:
  35         return "searchResponse";
  36     case Z_APDU_presentRequest:
  37         return "presentRequest";
  38     case Z_APDU_presentResponse:
  39         return "presentResponse";
  40     case Z_APDU_deleteResultSetRequest:
  41         return "deleteResultSetRequest";
  42     case Z_APDU_deleteResultSetResponse:
  43         return "deleteResultSetResponse";
  44     case Z_APDU_scanRequest:
  45         return "scanRequest";
  46     case Z_APDU_scanResponse:
  47         return "scanResponse";
  48     case Z_APDU_sortRequest:
  49         return "sortRequest";
  50     case Z_APDU_sortResponse:
  51         return "sortResponse";
  52     case Z_APDU_extendedServicesRequest:
  53         return "extendedServicesRequest";
  54     case Z_APDU_extendedServicesResponse:
  55         return "extendedServicesResponse";
  56     case Z_APDU_close:
  57         return "close";
  58     }
  59     return "other";
  60 }
  61
  62 static const char *gdu_name(Z_GDU *gdu)
  63 {
  64     switch(gdu->which)
  65     {
  66     case Z_GDU_Z3950:
  67         return apdu_name(gdu->u.z3950);
  68     case Z_GDU_HTTP_Request:
  69         return "HTTP Request";
  70     case Z_GDU_HTTP_Response:
  71         return "HTTP Response";
  72     }
  73     return "Unknown request/response";
  74 }
  75
  76 Yaz_Proxy::Yaz_Proxy(IYaz_PDU_Observable *the_PDU_Observable,
  77                      Yaz_Proxy *parent) :
  78     Yaz_Z_Assoc(the_PDU_Observable), m_bw_stat(60), m_pdu_stat(60)
  79 {
  80     m_PDU_Observable = the_PDU_Observable;
  81     m_client = 0;
  82     m_parent = parent;
  83     m_clientPool = 0;
  84     m_seqno = 1;
  85     m_keepalive_limit_bw = 500000;
  86     m_keepalive_limit_pdu = 1000;
  87     m_proxyTarget = 0;
  88     m_default_target = 0;
  89     m_proxy_authentication = 0;
  90     m_max_clients = 150;
  91     m_log_mask = 0;
  92     m_seed = time(0);
  93     m_client_idletime = 600;
  94     m_target_idletime = 600;
  95     m_optimize = xstrdup ("1");
  96     strcpy(m_session_str, "0 ");
  97     m_session_no=0;
  98     m_bytes_sent = m_bytes_recv = 0;
  99     m_bw_hold_PDU = 0;
 100     m_bw_max = 0;
 101     m_pdu_max = 0;
 102     m_max_record_retrieve = 0;
 103     m_reconfig_flag = 0;
 104     m_config_fname = 0;
 105     m_request_no = 0;
 106     m_invalid_session = 0;
 107     m_config = 0;
 108     m_marcxml_flag = 0;
 109     m_stylesheet = 0;
 110     m_initRequest_apdu = 0;
 111     m_initRequest_mem = 0;
 112     m_apdu_invalid_session = 0;
 113     m_mem_invalid_session = 0;
 114     m_s2z_odr_init = 0;
 115     m_s2z_odr_search = 0;
 116     m_s2z_init_apdu = 0;
 117     m_s2z_search_apdu = 0;
 118     m_s2z_present_apdu = 0;
 119     m_http_keepalive = 0;
 120     m_http_version = 0;
 121     m_soap_ns = 0;
 122     m_s2z_packing = Z_SRW_recordPacking_string;
 123     m_time_tv.tv_sec = 0;
 124     m_time_tv.tv_usec = 0;
 125 }
 126
 127 Yaz_Proxy::~Yaz_Proxy()
 128 {
 129     yaz_log(LOG_LOG, "%sClosed %d/%d sent/recv bytes total", m_session_str,
 130             m_bytes_sent, m_bytes_recv);
 131     nmem_destroy(m_initRequest_mem);
 132     nmem_destroy(m_mem_invalid_session);
 133     xfree (m_proxyTarget);
 134     xfree (m_default_target);
 135     xfree (m_proxy_authentication);
 136     xfree (m_optimize);
 137     xfree (m_stylesheet);
 138     if (m_s2z_odr_init)
 139         odr_destroy(m_s2z_odr_init);
 140     if (m_s2z_odr_search)
 141         odr_destroy(m_s2z_odr_search);
 142     delete m_config;
 143 }
 144
 145 int Yaz_Proxy::set_config(const char *config)
 146 {
 147     delete m_config;
 148     m_config = new Yaz_ProxyConfig();
 149     xfree(m_config_fname);
 150     m_config_fname = xstrdup(config);
 151     int r = m_config->read_xml(config);
 152     if (!r)
 153         m_config->get_generic_info(&m_log_mask, &m_max_clients);
 154     return r;
 155 }
 156
 157 void Yaz_Proxy::set_default_target(const char *target)
 158 {
 159     xfree (m_default_target);
 160     m_default_target = 0;
 161     if (target)
 162         m_default_target = (char *) xstrdup (target);
 163 }
 164
 165 void Yaz_Proxy::set_proxy_authentication (const char *auth)
 166 {
 167     xfree (m_proxy_authentication);
 168     m_proxy_authentication = 0;
 169     if (auth)
 170         m_proxy_authentication = (char *) xstrdup (auth);
 171 }
 172
 173 Yaz_ProxyConfig *Yaz_Proxy::check_reconfigure()
 174 {
 175     if (m_parent)
 176         return m_parent->check_reconfigure();
 177
 178     Yaz_ProxyConfig *cfg = m_config;
 179     if (m_reconfig_flag)
 180     {
 181         yaz_log(LOG_LOG, "reconfigure");
 182         yaz_log_reopen();
 183         if (m_config_fname && cfg)
 184         {
 185             yaz_log(LOG_LOG, "reconfigure config %s", m_config_fname);
 186             int r = cfg->read_xml(m_config_fname);
 187             if (r)
 188                 yaz_log(LOG_WARN, "reconfigure failed");
 189             else
 190             {
 191                 m_log_mask = 0;
 192                 cfg->get_generic_info(&m_log_mask, &m_max_clients);
 193             }
 194         }
 195         else
 196             yaz_log(LOG_LOG, "reconfigure");
 197         m_reconfig_flag = 0;
 198     }
 199     return cfg;
 200 }
 201
 202 IYaz_PDU_Observer *Yaz_Proxy::sessionNotify(IYaz_PDU_Observable
 203                                             *the_PDU_Observable, int fd)
 204 {
 205     check_reconfigure();
 206     Yaz_Proxy *new_proxy = new Yaz_Proxy(the_PDU_Observable, this);
 207     new_proxy->m_config = 0;
 208     new_proxy->m_config_fname = 0;
 209     new_proxy->timeout(m_client_idletime);
 210     new_proxy->m_target_idletime = m_target_idletime;
 211     new_proxy->set_default_target(m_default_target);
 212     new_proxy->m_max_clients = m_max_clients;
 213     new_proxy->m_log_mask = m_log_mask;
 214     new_proxy->set_APDU_log(get_APDU_log());
 215     if (m_log_mask & PROXY_LOG_APDU_CLIENT)
 216         new_proxy->set_APDU_yazlog(1);
 217     else
 218         new_proxy->set_APDU_yazlog(0);
 219     new_proxy->set_proxy_authentication(m_proxy_authentication);
 220     sprintf(new_proxy->m_session_str, "%ld:%d ", (long) time(0), m_session_no);
 221     m_session_no++;
 222     yaz_log (LOG_LOG, "%sNew session %s", new_proxy->m_session_str,
 223              the_PDU_Observable->getpeername());
 224     return new_proxy;
 225 }
 226
 227 char *Yaz_Proxy::get_cookie(Z_OtherInformation **otherInfo)
 228 {
 229     int oid[OID_SIZE];
 230     Z_OtherInformationUnit *oi;
 231     struct oident ent;
 232     ent.proto = PROTO_Z3950;
 233     ent.oclass = CLASS_USERINFO;
 234     ent.value = (oid_value) VAL_COOKIE;
 235     assert (oid_ent_to_oid (&ent, oid));
 236
 237     if (oid_ent_to_oid (&ent, oid) &&
 238         (oi = update_otherInformation(otherInfo, 0, oid, 1, 1)) &&
 239         oi->which == Z_OtherInfo_characterInfo)
 240         return oi->information.characterInfo;
 241     return 0;
 242 }
 243
 244 char *Yaz_Proxy::get_proxy(Z_OtherInformation **otherInfo)
 245 {
 246     int oid[OID_SIZE];
 247     Z_OtherInformationUnit *oi;
 248     struct oident ent;
 249     ent.proto = PROTO_Z3950;
 250     ent.oclass = CLASS_USERINFO;
 251     ent.value = (oid_value) VAL_PROXY;
 252     if (oid_ent_to_oid (&ent, oid) &&
 253         (oi = update_otherInformation(otherInfo, 0, oid, 1, 1)) &&
 254         oi->which == Z_OtherInfo_characterInfo)
 255         return oi->information.characterInfo;
 256     return 0;
 257 }
 258
 259 const char *Yaz_Proxy::load_balance(const char **url)
 260 {
 261     int zurl_in_use[MAX_ZURL_PLEX];
 262     Yaz_ProxyClient *c;
 263     int i;
 264
 265     for (i = 0; i<MAX_ZURL_PLEX; i++)
 266         zurl_in_use[i] = 0;
 267     for (c = m_parent->m_clientPool; c; c = c->m_next)
 268     {
 269         for (i = 0; url[i]; i++)
 270             if (!strcmp(url[i], c->get_hostname()))
 271                 zurl_in_use[i]++;
 272     }
 273     int min = 100000;
 274     const char *ret = 0;
 275     for (i = 0; url[i]; i++)
 276     {
 277         yaz_log(LOG_DEBUG, "%szurl=%s use=%d",
 278                 m_session_str, url[i], zurl_in_use[i]);
 279         if (min > zurl_in_use[i])
 280         {
 281             ret = url[i];
 282             min = zurl_in_use[i];
 283         }
 284     }
 285     return ret;
 286 }
 287
 288 Yaz_ProxyClient *Yaz_Proxy::get_client(Z_APDU *apdu, const char *cookie,
 289                                        const char *proxy_host)
 290 {
 291     assert (m_parent);
 292     Yaz_Proxy *parent = m_parent;
 293     Z_OtherInformation **oi;
 294     Yaz_ProxyClient *c = m_client;
 295
 296     if (!m_proxyTarget)
 297     {
 298         const char *url[MAX_ZURL_PLEX];
 299         Yaz_ProxyConfig *cfg = check_reconfigure();
 300         if (proxy_host)
 301         {
 302 #if 1
 303 /* only to be enabled for debugging... */
 304             if (!strcmp(proxy_host, "stop"))
 305                 exit(0);
 306 #endif
 307             xfree(m_default_target);
 308             m_default_target = xstrdup(proxy_host);
 309             proxy_host = m_default_target;
 310         }
 311         int client_idletime = -1;
 312         const char *cql2rpn_fname = 0;
 313         url[0] = m_default_target;
 314         url[1] = 0;
 315         if (cfg)
 316         {
 317             int pre_init = 0;
 318             cfg->get_target_info(proxy_host, url, &m_bw_max,
 319                                  &m_pdu_max, &m_max_record_retrieve,
 320                                  &m_target_idletime, &client_idletime,
 321                                  &parent->m_max_clients,
 322                                  &m_keepalive_limit_bw,
 323                                  &m_keepalive_limit_pdu,
 324                                  &pre_init,
 325                                  &cql2rpn_fname);
 326         }
 327         if (client_idletime != -1)
 328         {
 329             m_client_idletime = client_idletime;
 330             timeout(m_client_idletime);
 331         }
 332         if (cql2rpn_fname)
 333             m_cql2rpn.set_pqf_file(cql2rpn_fname);
 334         if (!url[0])
 335         {
 336             yaz_log(LOG_LOG, "%sNo default target", m_session_str);
 337             return 0;
 338         }
 339         // we don't handle multiplexing for cookie session, so we just
 340         // pick the first one in this case (anonymous users will be able
 341         // to use any backend)
 342         if (cookie && *cookie)
 343             m_proxyTarget = (char*) xstrdup(url[0]);
 344         else
 345             m_proxyTarget = (char*) xstrdup(load_balance(url));
 346     }
 347     if (cookie && *cookie)
 348     {   // search in sessions with a cookie
 349         for (c = parent->m_clientPool; c; c = c->m_next)
 350         {
 351             assert (c->m_prev);
 352             assert (*c->m_prev == c);
 353             if (c->m_cookie && !strcmp(cookie,c->m_cookie) &&
 354                 !strcmp(m_proxyTarget, c->get_hostname()))
 355             {
 356                 // Found it in cache
 357                 // The following handles "cancel"
 358                 // If connection is busy (waiting for PDU) and
 359                 // we have an initRequest we can safely do re-open
 360                 if (c->m_waiting && apdu->which == Z_APDU_initRequest)
 361                 {
 362                     yaz_log (LOG_LOG, "%s REOPEN target=%s", m_session_str,
 363                              c->get_hostname());
 364                     c->close();
 365                     c->m_init_flag = 0;
 366
 367                     c->m_last_ok = 0;
 368                     c->m_cache.clear();
 369                     c->m_last_resultCount = 0;
 370                     c->m_sr_transform = 0;
 371                     c->m_waiting = 0;
 372                     c->m_resultSetStartPoint = 0;
 373                     c->m_target_idletime = m_target_idletime;
 374                     if (c->client(m_proxyTarget))
 375                     {
 376                         delete c;
 377                         return 0;
 378                     }
 379                     c->timeout(30);
 380                 }
 381                 c->m_seqno = parent->m_seqno;
 382                 if (c->m_server && c->m_server != this)
 383                     c->m_server->m_client = 0;
 384                 c->m_server = this;
 385                 (parent->m_seqno)++;
 386                 yaz_log (LOG_DEBUG, "get_client 1 %p %p", this, c);
 387                 return c;
 388             }
 389         }
 390     }
 391     else if (!c)
 392     {
 393         // don't have a client session yet. Search in session w/o cookie
 394         for (c = parent->m_clientPool; c; c = c->m_next)
 395         {
 396             assert (c->m_prev);
 397             assert (*c->m_prev == c);
 398             if (c->m_server == 0 && c->m_cookie == 0 &&
 399                 c->m_waiting == 0 &&
 400                 !strcmp(m_proxyTarget, c->get_hostname()))
 401             {
 402                 // found it in cache
 403                 yaz_log (LOG_LOG, "%sREUSE %s",
 404                          m_session_str, c->get_hostname());
 405
 406                 c->m_seqno = parent->m_seqno;
 407                 assert(c->m_server == 0);
 408                 c->m_server = this;
 409
 410                 if (parent->m_log_mask & PROXY_LOG_APDU_SERVER)
 411                     c->set_APDU_yazlog(1);
 412                 else
 413                     c->set_APDU_yazlog(0);
 414
 415                 (parent->m_seqno)++;
 416
 417                 parent->pre_init();
 418
 419                 return c;
 420             }
 421         }
 422     }
 423     if (!m_client)
 424     {
 425         if (apdu->which != Z_APDU_initRequest)
 426         {
 427             yaz_log (LOG_LOG, "no first INIT!");
 428             return 0;
 429         }
 430         Z_InitRequest *initRequest = apdu->u.initRequest;
 431
 432         if (!initRequest->idAuthentication)
 433         {
 434             if (m_proxy_authentication)
 435             {
 436                 initRequest->idAuthentication =
 437                     (Z_IdAuthentication *)
 438                     odr_malloc (odr_encode(),
 439                                 sizeof(*initRequest->idAuthentication));
 440                 initRequest->idAuthentication->which =
 441                     Z_IdAuthentication_open;
 442                 initRequest->idAuthentication->u.open =
 443                     odr_strdup (odr_encode(), m_proxy_authentication);
 444             }
 445         }
 446
 447         // go through list of clients - and find the lowest/oldest one.
 448         Yaz_ProxyClient *c_min = 0;
 449         int min_seq = -1;
 450         int no_of_clients = 0;
 451         if (parent->m_clientPool)
 452             yaz_log (LOG_DEBUG, "Existing sessions");
 453         for (c = parent->m_clientPool; c; c = c->m_next)
 454         {
 455             yaz_log (LOG_DEBUG, " Session %-3d wait=%d %s cookie=%s", c->m_seqno,
 456                                c->m_waiting, c->get_hostname(),
 457                                c->m_cookie ? c->m_cookie : "");
 458             no_of_clients++;
 459             if (min_seq < 0 || c->m_seqno < min_seq)
 460             {
 461                 min_seq = c->m_seqno;
 462                 c_min = c;
 463             }
 464         }
 465         if (no_of_clients >= parent->m_max_clients)
 466         {
 467             c = c_min;
 468             if (c->m_waiting || strcmp(m_proxyTarget, c->get_hostname()))
 469             {
 470                 yaz_log (LOG_LOG, "%sMAXCLIENTS Destroy %d",
 471                          m_session_str, c->m_seqno);
 472                 if (c->m_server && c->m_server != this)
 473                     delete c->m_server;
 474                 c->m_server = 0;
 475             }
 476             else
 477             {
 478                 yaz_log (LOG_LOG, "%sMAXCLIENTS Reuse %d %d %s",
 479                          m_session_str,
 480                          c->m_seqno, parent->m_seqno, c->get_hostname());
 481                 xfree (c->m_cookie);
 482                 c->m_cookie = 0;
 483                 if (cookie)
 484                     c->m_cookie = xstrdup(cookie);
 485                 c->m_seqno = parent->m_seqno;
 486                 if (c->m_server && c->m_server != this)
 487                 {
 488                     c->m_server->m_client = 0;
 489                     delete c->m_server;
 490                 }
 491                 (parent->m_seqno)++;
 492                 c->m_target_idletime = m_target_idletime;
 493                 c->timeout(m_target_idletime);
 494
 495                 if (parent->m_log_mask & PROXY_LOG_APDU_SERVER)
 496                     c->set_APDU_yazlog(1);
 497                 else
 498                     c->set_APDU_yazlog(0);
 499
 500                 return c;
 501             }
 502         }
 503         else
 504         {
 505             yaz_log (LOG_LOG, "%sNEW %d %s",
 506                      m_session_str, parent->m_seqno, m_proxyTarget);
 507             c = new Yaz_ProxyClient(m_PDU_Observable->clone(), parent);
 508             c->m_next = parent->m_clientPool;
 509             if (c->m_next)
 510                 c->m_next->m_prev = &c->m_next;
 511             parent->m_clientPool = c;
 512             c->m_prev = &parent->m_clientPool;
 513         }
 514
 515         xfree (c->m_cookie);
 516         c->m_cookie = 0;
 517         if (cookie)
 518             c->m_cookie = xstrdup(cookie);
 519
 520         c->m_seqno = parent->m_seqno;
 521         c->m_init_flag = 0;
 522         c->m_last_resultCount = 0;
 523         c->m_last_ok = 0;
 524         c->m_cache.clear();
 525         c->m_sr_transform = 0;
 526         c->m_waiting = 0;
 527         c->m_resultSetStartPoint = 0;
 528         (parent->m_seqno)++;
 529         if (c->client(m_proxyTarget))
 530         {
 531             delete c;
 532             return 0;
 533         }
 534         c->m_target_idletime = m_target_idletime;
 535         c->timeout(30);
 536
 537         if (parent->m_log_mask & PROXY_LOG_APDU_SERVER)
 538             c->set_APDU_yazlog(1);
 539         else
 540             c->set_APDU_yazlog(0);
 541     }
 542     yaz_log (LOG_DEBUG, "get_client 3 %p %p", this, c);
 543     return c;
 544 }
 545
 546 void Yaz_Proxy::display_diagrecs(Z_DiagRec **pp, int num)
 547 {
 548     int i;
 549     for (i = 0; i<num; i++)
 550     {
 551         oident *ent;
 552         Z_DefaultDiagFormat *r;
 553         Z_DiagRec *p = pp[i];
 554         if (p->which != Z_DiagRec_defaultFormat)
 555         {
 556             yaz_log(LOG_LOG, "%sError no diagnostics", m_session_str);
 557             return;
 558         }
 559         else
 560             r = p->u.defaultFormat;
 561         if (!(ent = oid_getentbyoid(r->diagnosticSetId)) ||
 562             ent->oclass != CLASS_DIAGSET || ent->value != VAL_BIB1)
 563             yaz_log(LOG_LOG, "%sError unknown diagnostic set", m_session_str);
 564         switch (r->which)
 565         {
 566         case Z_DefaultDiagFormat_v2Addinfo:
 567             yaz_log(LOG_LOG, "%sError %d %s:%s",
 568                     m_session_str,
 569                     *r->condition, diagbib1_str(*r->condition),
 570                     r->u.v2Addinfo);
 571             break;
 572         case Z_DefaultDiagFormat_v3Addinfo:
 573             yaz_log(LOG_LOG, "%sError %d %s:%s",
 574                     m_session_str,
 575                     *r->condition, diagbib1_str(*r->condition),
 576                     r->u.v3Addinfo);
 577             break;
 578         }
 579     }
 580 }
 581
 582 void Yaz_Proxy::convert_xsl(Z_NamePlusRecordList *p)
 583 {
 584     if (!m_stylesheet)
 585         return;
 586     xmlDocPtr xslt_doc = xmlParseFile(m_stylesheet);
 587     xsltStylesheetPtr xsp;
 588
 589     xsp = xsltParseStylesheetDoc(xslt_doc);
 590
 591     int i;
 592     for (i = 0; i < p->num_records; i++)
 593     {
 594         Z_NamePlusRecord *npr = p->records[i];
 595         if (npr->which == Z_NamePlusRecord_databaseRecord)
 596         {
 597             Z_External *r = npr->u.databaseRecord;
 598             if (r->which == Z_External_octet)
 599             {
 600                 xmlDocPtr res, doc = xmlParseMemory(
 601                     (char*) r->u.octet_aligned->buf,
 602                     r->u.octet_aligned->len);
 603
 604                 res = xsltApplyStylesheet(xsp, doc, 0);
 605
 606                 xmlChar *out_buf;
 607                 int out_len;
 608                 xmlDocDumpMemory (res, &out_buf, &out_len);
 609                 p->records[i]->u.databaseRecord =
 610                     z_ext_record(odr_encode(), VAL_TEXT_XML,
 611                                  (char*) out_buf, out_len);
 612                 xmlFreeDoc(doc);
 613                 xmlFreeDoc(res);
 614             }
 615         }
 616     }
 617     xsltFreeStylesheet(xsp);
 618 }
 619
 620 void Yaz_Proxy::convert_to_marcxml(Z_NamePlusRecordList *p)
 621 {
 622     int i;
 623
 624     yaz_marc_t mt = yaz_marc_create();
 625     yaz_marc_xml(mt, YAZ_MARC_MARCXML);
 626     for (i = 0; i < p->num_records; i++)
 627     {
 628         Z_NamePlusRecord *npr = p->records[i];
 629         if (npr->which == Z_NamePlusRecord_databaseRecord)
 630         {
 631             Z_External *r = npr->u.databaseRecord;
 632             if (r->which == Z_External_octet)
 633             {
 634                 int rlen;
 635                 char *result;
 636                 if (yaz_marc_decode_buf(mt, (char*) r->u.octet_aligned->buf,
 637                                         r->u.octet_aligned->len,
 638                                         &result, &rlen))
 639                 {
 640                     yaz_iconv_t cd = yaz_iconv_open("UTF-8", "MARC-8");
 641                     WRBUF wrbuf = wrbuf_alloc();
 642
 643                     char outbuf[120];
 644                     size_t inbytesleft = rlen;
 645                     const char *inp = result;
 646                     while (cd && inbytesleft)
 647                     {
 648                         size_t outbytesleft = sizeof(outbuf);
 649                         char *outp = outbuf;
 650                         size_t r;
 651
 652                         r = yaz_iconv (cd, (char**) &inp,
 653                                        &inbytesleft,
 654                                        &outp, &outbytesleft);
 655                         if (r == (size_t) (-1))
 656                         {
 657                             int e = yaz_iconv_error(cd);
 658                             if (e != YAZ_ICONV_E2BIG)
 659                             {
 660                                 yaz_log(LOG_WARN, "conversion failure");
 661                                 break;
 662                             }
 663                         }
 664                         wrbuf_write(wrbuf, outbuf, outp - outbuf);
 665                     }
 666                     if (cd)
 667                         yaz_iconv_close(cd);
 668
 669                     npr->u.databaseRecord = z_ext_record(odr_encode(),
 670                                                          VAL_TEXT_XML,
 671                                                          wrbuf_buf(wrbuf),
 672                                                          wrbuf_len(wrbuf));
 673                     wrbuf_free(wrbuf, 1);
 674                 }
 675             }
 676         }
 677     }
 678     yaz_marc_destroy(mt);
 679 }
 680
 681 void Yaz_Proxy::logtime()
 682 {
 683     if (m_time_tv.tv_sec)
 684     {
 685         struct timeval tv;
 686         gettimeofday(&tv, 0);
 687         long diff = (tv.tv_sec - m_time_tv.tv_sec)*1000000 +
 688             (tv.tv_usec - m_time_tv.tv_usec);
 689         if (diff >= 0)
 690             yaz_log(LOG_LOG, "%sElapsed %ld.%03ld", m_session_str,
 691                     diff/1000000, (diff/1000)%1000);
 692     }
 693     m_time_tv.tv_sec = 0;
 694     m_time_tv.tv_usec = 0;
 695 }
 696
 697 int Yaz_Proxy::send_http_response(int code)
 698 {
 699     ODR o = odr_encode();
 700     const char *ctype = "text/xml";
 701     Z_GDU *gdu = z_get_HTTP_Response(o, code);
 702     Z_HTTP_Response *hres = gdu->u.HTTP_Response;
 703     if (m_http_version)
 704         hres->version = odr_strdup(o, m_http_version);
 705     m_http_keepalive = 0;
 706     if (m_log_mask & PROXY_LOG_REQ_CLIENT)
 707     {
 708         yaz_log (LOG_LOG, "%sSending %s to client", m_session_str,
 709                  gdu_name(gdu));
 710     }
 711     int len;
 712     int r = send_GDU(gdu, &len);
 713     logtime();
 714     return r;
 715 }
 716
 717 int Yaz_Proxy::send_srw_response(Z_SRW_PDU *srw_pdu)
 718 {
 719     ODR o = odr_encode();
 720     const char *ctype = "text/xml";
 721     Z_GDU *gdu = z_get_HTTP_Response(o, 200);
 722     Z_HTTP_Response *hres = gdu->u.HTTP_Response;
 723     if (m_http_version)
 724         hres->version = odr_strdup(o, m_http_version);
 725     z_HTTP_header_add(o, &hres->headers, "Content-Type", ctype);
 726     if (m_http_keepalive)
 727         z_HTTP_header_add(o, &hres->headers, "Connection", "Keep-Alive");
 728
 729     static Z_SOAP_Handler soap_handlers[2] = {
 730 #if HAVE_XSLT
 731         {"http://www.loc.gov/zing/srw/", 0,
 732          (Z_SOAP_fun) yaz_srw_codec},
 733 #endif
 734         {0, 0, 0}
 735     };
 736
 737     Z_SOAP *soap_package = (Z_SOAP*) odr_malloc(o, sizeof(Z_SOAP));
 738     soap_package->which = Z_SOAP_generic;
 739     soap_package->u.generic =
 740         (Z_SOAP_Generic *) odr_malloc(o,  sizeof(*soap_package->u.generic));
 741     soap_package->u.generic->no = 0;
 742     soap_package->u.generic->ns = soap_handlers[0].ns;
 743     soap_package->u.generic->p = (void *) srw_pdu;
 744     soap_package->ns = m_soap_ns;
 745     int ret = z_soap_codec_enc(o, &soap_package,
 746                                &hres->content_buf, &hres->content_len,
 747                                soap_handlers, 0);
 748     if (m_log_mask & PROXY_LOG_REQ_CLIENT)
 749     {
 750         yaz_log (LOG_LOG, "%sSending %s to client", m_session_str,
 751                  gdu_name(gdu));
 752     }
 753     int len;
 754     int r = send_GDU(gdu, &len);
 755     logtime();
 756     return r;
 757 }
 758
 759 int Yaz_Proxy::send_to_srw_client_error(int srw_error)
 760 {
 761     ODR o = odr_encode();
 762     Z_SRW_PDU *srw_pdu = yaz_srw_get(o, Z_SRW_searchRetrieve_response);
 763     Z_SRW_searchRetrieveResponse *srw_res = srw_pdu->u.response;
 764
 765     srw_res->num_diagnostics = 1;
 766     srw_res->diagnostics = (Z_SRW_diagnostic *)
 767         odr_malloc(o, sizeof(*srw_res->diagnostics));
 768     srw_res->diagnostics[0].code =  odr_intdup(o, srw_error);
 769     srw_res->diagnostics[0].details = 0;
 770     return send_srw_response(srw_pdu);
 771 }
 772
 773 int Yaz_Proxy::z_to_srw_diag(ODR o, Z_SRW_searchRetrieveResponse *srw_res,
 774                              Z_DefaultDiagFormat *ddf)
 775 {
 776     int bib1_code = *ddf->condition;
 777     if (bib1_code == 109)
 778         return 404;
 779     srw_res->num_diagnostics = 1;
 780     srw_res->diagnostics = (Z_SRW_diagnostic *)
 781         odr_malloc(o, sizeof(*srw_res->diagnostics));
 782     srw_res->diagnostics[0].code =
 783         odr_intdup(o, yaz_diag_bib1_to_srw(*ddf->condition));
 784     srw_res->diagnostics[0].details = ddf->u.v2Addinfo;
 785     return 0;
 786 }
 787
 788 int Yaz_Proxy::send_to_srw_client_ok(int hits, Z_Records *records, int start)
 789 {
 790     ODR o = odr_encode();
 791     Z_SRW_PDU *srw_pdu = yaz_srw_get(o, Z_SRW_searchRetrieve_response);
 792     Z_SRW_searchRetrieveResponse *srw_res = srw_pdu->u.response;
 793
 794     srw_res->numberOfRecords = odr_intdup (o, hits);
 795     if (records && records->which == Z_Records_DBOSD)
 796     {
 797         srw_res->num_records =
 798             records->u.databaseOrSurDiagnostics->num_records;
 799         int i;
 800         srw_res->records = (Z_SRW_record *)
 801             odr_malloc(o, srw_res->num_records * sizeof(Z_SRW_record));
 802         for (i = 0; i < srw_res->num_records; i++)
 803         {
 804             Z_NamePlusRecord *npr = records->u.databaseOrSurDiagnostics->records[i];
 805             if (npr->which != Z_NamePlusRecord_databaseRecord)
 806             {
 807                 srw_res->records[i].recordSchema = "diagnostic";
 808                 srw_res->records[i].recordPacking = m_s2z_packing;
 809                 srw_res->records[i].recordData_buf = "67";
 810                 srw_res->records[i].recordData_len = 2;
 811                 srw_res->records[i].recordPosition = odr_intdup(o, i+start);
 812                 continue;
 813             }
 814             Z_External *r = npr->u.databaseRecord;
 815             oident *ent = oid_getentbyoid(r->direct_reference);
 816             if (r->which == Z_External_octet && ent->value == VAL_TEXT_XML)
 817             {
 818                 srw_res->records[i].recordSchema = "http://www.loc.gov/marcxml/";
 819                 srw_res->records[i].recordPacking = m_s2z_packing;
 820                 srw_res->records[i].recordData_buf = (char*)
 821                     r->u.octet_aligned->buf;
 822                 srw_res->records[i].recordData_len = r->u.octet_aligned->len;
 823                 srw_res->records[i].recordPosition = odr_intdup(o, i+start);
 824             }
 825             else
 826             {
 827                 srw_res->records[i].recordSchema = "diagnostic";
 828                 srw_res->records[i].recordPacking = m_s2z_packing;
 829                 srw_res->records[i].recordData_buf = "67";
 830                 srw_res->records[i].recordData_len = 2;
 831                 srw_res->records[i].recordPosition = odr_intdup(o, i+start);
 832             }
 833         }
 834     }
 835     if (records && records->which == Z_Records_NSD)
 836     {
 837         int http_code;
 838         http_code = z_to_srw_diag(odr_encode(), srw_res,
 839                                    records->u.nonSurrogateDiagnostic);
 840         if (http_code)
 841             return send_http_response(http_code);
 842     }
 843     return send_srw_response(srw_pdu);
 844
 845 }
 846
 847 int Yaz_Proxy::send_srw_explain()
 848 {
 849     Z_SRW_PDU *res = yaz_srw_get(odr_encode(), Z_SRW_explain_response);
 850     Z_SRW_explainResponse *er = res->u.explain_response;
 851
 852     Yaz_ProxyConfig *cfg = check_reconfigure();
 853     if (cfg)
 854     {
 855         int len;
 856         assert (m_proxyTarget);
 857         char *b = cfg->get_explain(odr_encode(), 0 /* target */,
 858                                    0 /* db */, &len);
 859         if (b)
 860         {
 861             er->record.recordData_buf = b;
 862             er->record.recordData_len = len;
 863             er->record.recordPacking = m_s2z_packing;
 864         }
 865     }
 866     return send_srw_response(res);
 867 }
 868
 869 int Yaz_Proxy::send_PDU_convert(Z_APDU *apdu, int *len)
 870 {
 871     if (m_http_version)
 872     {
 873         if (apdu->which == Z_APDU_initResponse)
 874         {
 875             Z_InitResponse *res = apdu->u.initResponse;
 876             if (*res->result == 0)
 877             {
 878                 send_to_srw_client_error(3);
 879             }
 880             else if (!m_s2z_search_apdu)
 881             {
 882                 send_srw_explain();
 883             }
 884             else
 885             {
 886                 handle_incoming_Z_PDU(m_s2z_search_apdu);
 887             }
 888         }
 889         else if (m_s2z_search_apdu && apdu->which == Z_APDU_searchResponse)
 890         {
 891             m_s2z_search_apdu = 0;
 892             Z_SearchResponse *res = apdu->u.searchResponse;
 893             m_s2z_hit_count = *res->resultCount;
 894             if (res->records && res->records->which == Z_Records_NSD)
 895             {
 896                 send_to_srw_client_ok(0, res->records, 1);
 897             }
 898             else if (m_s2z_present_apdu)
 899             {
 900                 handle_incoming_Z_PDU(m_s2z_present_apdu);
 901             }
 902             else
 903             {
 904                 send_to_srw_client_ok(m_s2z_hit_count, res->records, 1);
 905             }
 906         }
 907         else if (m_s2z_present_apdu && apdu->which == Z_APDU_presentResponse)
 908         {
 909             int start =
 910                 *m_s2z_present_apdu->u.presentRequest->resultSetStartPoint;
 911
 912             m_s2z_present_apdu = 0;
 913             Z_PresentResponse *res = apdu->u.presentResponse;
 914             send_to_srw_client_ok(m_s2z_hit_count, res->records, start);
 915         }
 916     }
 917     else
 918     {
 919         if (m_log_mask & PROXY_LOG_REQ_CLIENT)
 920             yaz_log (LOG_LOG, "%sSending %s to client", m_session_str,
 921                      apdu_name(apdu));
 922         int r = send_Z_PDU(apdu, len);
 923         logtime();
 924         return r;
 925     }
 926     return 0;
 927 }
 928
 929 int Yaz_Proxy::send_to_client(Z_APDU *apdu)
 930 {
 931     int len = 0;
 932     int kill_session = 0;
 933     if (apdu->which == Z_APDU_searchResponse)
 934     {
 935         Z_SearchResponse *sr = apdu->u.searchResponse;
 936         Z_Records *p = sr->records;
 937         if (p && p->which == Z_Records_NSD)
 938         {
 939             Z_DiagRec dr, *dr_p = &dr;
 940             dr.which = Z_DiagRec_defaultFormat;
 941             dr.u.defaultFormat = p->u.nonSurrogateDiagnostic;
 942
 943             *sr->searchStatus = 0;
 944             display_diagrecs(&dr_p, 1);
 945         }
 946         else
 947         {
 948             if (p && p->which == Z_Records_DBOSD)
 949             {
 950                 if (m_marcxml_flag)
 951                     convert_to_marcxml(p->u.databaseOrSurDiagnostics);
 952                 convert_xsl(p->u.databaseOrSurDiagnostics);
 953             }
 954             if (sr->resultCount)
 955             {
 956                 yaz_log(LOG_LOG, "%s%d hits", m_session_str,
 957                         *sr->resultCount);
 958                 if (*sr->resultCount < 0)
 959                 {
 960                     m_invalid_session = 1;
 961                     kill_session = 1;
 962
 963                     *sr->searchStatus = 0;
 964                     sr->records =
 965                         create_nonSurrogateDiagnostics(odr_encode(), 2, 0);
 966                     *sr->resultCount = 0;
 967                 }
 968             }
 969         }
 970     }
 971     else if (apdu->which == Z_APDU_presentResponse)
 972     {
 973         Z_PresentResponse *sr = apdu->u.presentResponse;
 974         Z_Records *p = sr->records;
 975         if (p && p->which == Z_Records_NSD)
 976         {
 977             Z_DiagRec dr, *dr_p = &dr;
 978             dr.which = Z_DiagRec_defaultFormat;
 979             dr.u.defaultFormat = p->u.nonSurrogateDiagnostic;
 980             if (*sr->presentStatus == Z_PresentStatus_success)
 981                 *sr->presentStatus = Z_PresentStatus_failure;
 982             display_diagrecs(&dr_p, 1);
 983         }
 984         if (p && p->which == Z_Records_DBOSD)
 985         {
 986             if (m_marcxml_flag)
 987                 convert_to_marcxml(p->u.databaseOrSurDiagnostics);
 988             convert_xsl(p->u.databaseOrSurDiagnostics);
 989         }
 990     }
 991     int r = send_PDU_convert(apdu, &len);
 992     if (r)
 993         return r;
 994     m_bytes_sent += len;
 995     m_bw_stat.add_bytes(len);
 996     if (kill_session)
 997     {
 998         delete m_client;
 999         m_client = 0;
1000         m_parent->pre_init();
1001     }
1002     if (m_http_version)
1003     {
1004         if (!m_http_keepalive)
1005         {
1006 #if 1
1007             timeout(1);
1008 #else
1009             shutdown();
1010             return -1;
1011 #endif
1012         }
1013     }
1014     return r;
1015 }
1016
1017 int Yaz_ProxyClient::send_to_target(Z_APDU *apdu)
1018 {
1019     int len = 0;
1020     int r = send_Z_PDU(apdu, &len);
1021     if (m_root->get_log_mask() & PROXY_LOG_REQ_SERVER)
1022         yaz_log (LOG_LOG, "%sSending %s to %s %d bytes",
1023                  get_session_str(),
1024                  apdu_name(apdu), get_hostname(), len);
1025     m_bytes_sent += len;
1026     return r;
1027 }
1028
1029 Z_APDU *Yaz_Proxy::result_set_optimize(Z_APDU *apdu)
1030 {
1031     if (apdu->which == Z_APDU_presentRequest)
1032     {
1033         Z_PresentRequest *pr = apdu->u.presentRequest;
1034         int toget = *pr->numberOfRecordsRequested;
1035         int start = *pr->resultSetStartPoint;
1036
1037         yaz_log(LOG_LOG, "%sPresent %s %d+%d", m_session_str,
1038                 pr->resultSetId, start, toget);
1039
1040         if (*m_parent->m_optimize == '0')
1041             return apdu;
1042
1043         if (!m_client->m_last_resultSetId)
1044         {
1045             Z_APDU *new_apdu = create_Z_PDU(Z_APDU_presentResponse);
1046             new_apdu->u.presentResponse->records =
1047                 create_nonSurrogateDiagnostics(odr_encode(), 30,
1048                                                pr->resultSetId);
1049             send_to_client(new_apdu);
1050             return 0;
1051         }
1052         if (!strcmp(m_client->m_last_resultSetId, pr->resultSetId))
1053         {
1054             if (start+toget-1 > m_client->m_last_resultCount)
1055             {
1056                 Z_APDU *new_apdu = create_Z_PDU(Z_APDU_presentResponse);
1057                 new_apdu->u.presentResponse->records =
1058                     create_nonSurrogateDiagnostics(odr_encode(), 13, 0);
1059                 send_to_client(new_apdu);
1060                 return 0;
1061             }
1062             Z_NamePlusRecordList *npr;
1063             if (m_client->m_cache.lookup (odr_encode(), &npr, start, toget,
1064                                           pr->preferredRecordSyntax,
1065                                           pr->recordComposition))
1066             {
1067                 yaz_log (LOG_LOG, "%sReturned cached records for present request",
1068                          m_session_str);
1069                 Z_APDU *new_apdu = create_Z_PDU(Z_APDU_presentResponse);
1070                 new_apdu->u.presentResponse->referenceId = pr->referenceId;
1071
1072                 new_apdu->u.presentResponse->numberOfRecordsReturned
1073                     = odr_intdup(odr_encode(), toget);
1074
1075                 new_apdu->u.presentResponse->records = (Z_Records*)
1076                     odr_malloc(odr_encode(), sizeof(Z_Records));
1077                 new_apdu->u.presentResponse->records->which = Z_Records_DBOSD;
1078                 new_apdu->u.presentResponse->records->u.databaseOrSurDiagnostics = npr;
1079                 new_apdu->u.presentResponse->nextResultSetPosition =
1080                     odr_intdup(odr_encode(), start+toget);
1081
1082                 send_to_client(new_apdu);
1083                 return 0;
1084             }
1085         }
1086     }
1087
1088     if (apdu->which != Z_APDU_searchRequest)
1089         return apdu;
1090     Z_SearchRequest *sr = apdu->u.searchRequest;
1091     Yaz_Z_Query *this_query = new Yaz_Z_Query;
1092     Yaz_Z_Databases this_databases;
1093
1094     this_databases.set(sr->num_databaseNames, (const char **)
1095                        sr->databaseNames);
1096
1097     this_query->set_Z_Query(sr->query);
1098
1099     char query_str[120];
1100     this_query->print(query_str, sizeof(query_str)-1);
1101     yaz_log(LOG_LOG, "%sSearch %s", m_session_str, query_str);
1102
1103     if (*m_parent->m_optimize != '0' &&
1104         m_client->m_last_ok && m_client->m_last_query &&
1105         m_client->m_last_query->match(this_query) &&
1106         !strcmp(m_client->m_last_resultSetId, sr->resultSetName) &&
1107         m_client->m_last_databases.match(this_databases))
1108     {
1109         delete this_query;
1110         if (m_client->m_last_resultCount > *sr->smallSetUpperBound &&
1111             m_client->m_last_resultCount < *sr->largeSetLowerBound)
1112         {
1113             Z_NamePlusRecordList *npr;
1114             int toget = *sr->mediumSetPresentNumber;
1115             Z_RecordComposition *comp = 0;
1116
1117             if (toget > m_client->m_last_resultCount)
1118                 toget = m_client->m_last_resultCount;
1119
1120             if (sr->mediumSetElementSetNames)
1121             {
1122                 comp = (Z_RecordComposition *)
1123                     odr_malloc(odr_encode(), sizeof(Z_RecordComposition));
1124                 comp->which = Z_RecordComp_simple;
1125                 comp->u.simple = sr->mediumSetElementSetNames;
1126             }
1127
1128             if (m_client->m_cache.lookup (odr_encode(), &npr, 1, toget,
1129                                           sr->preferredRecordSyntax, comp))
1130             {
1131                 yaz_log (LOG_LOG, "%sReturned cached records for medium set",
1132                          m_session_str);
1133                 Z_APDU *new_apdu = create_Z_PDU(Z_APDU_searchResponse);
1134                 new_apdu->u.searchResponse->referenceId = sr->referenceId;
1135                 new_apdu->u.searchResponse->resultCount =
1136                     &m_client->m_last_resultCount;
1137
1138                 new_apdu->u.searchResponse->numberOfRecordsReturned
1139                     = odr_intdup(odr_encode(), toget);
1140
1141                 new_apdu->u.searchResponse->presentStatus =
1142                     odr_intdup(odr_encode(), Z_PresentStatus_success);
1143                 new_apdu->u.searchResponse->records = (Z_Records*)
1144                     odr_malloc(odr_encode(), sizeof(Z_Records));
1145                 new_apdu->u.searchResponse->records->which = Z_Records_DBOSD;
1146                 new_apdu->u.searchResponse->records->u.databaseOrSurDiagnostics = npr;
1147                 new_apdu->u.searchResponse->nextResultSetPosition =
1148                     odr_intdup(odr_encode(), toget+1);
1149                 send_to_client(new_apdu);
1150                 return 0;
1151             }
1152             else
1153             {
1154                 // medium Set
1155                 // send present request (medium size)
1156                 yaz_log (LOG_LOG, "%sOptimizing search for medium set",
1157                          m_session_str);
1158
1159                 Z_APDU *new_apdu = create_Z_PDU(Z_APDU_presentRequest);
1160                 Z_PresentRequest *pr = new_apdu->u.presentRequest;
1161                 pr->referenceId = sr->referenceId;
1162                 pr->resultSetId = sr->resultSetName;
1163                 pr->preferredRecordSyntax = sr->preferredRecordSyntax;
1164                 *pr->numberOfRecordsRequested = toget;
1165                 pr->recordComposition = comp;
1166                 m_client->m_sr_transform = 1;
1167                 return new_apdu;
1168             }
1169         }
1170         else if (m_client->m_last_resultCount >= *sr->largeSetLowerBound ||
1171             m_client->m_last_resultCount <= 0)
1172         {
1173             // large set. Return pseudo-search response immediately
1174             yaz_log (LOG_LOG, "%sOptimizing search for large set",
1175                      m_session_str);
1176             Z_APDU *new_apdu = create_Z_PDU(Z_APDU_searchResponse);
1177             new_apdu->u.searchResponse->referenceId = sr->referenceId;
1178             new_apdu->u.searchResponse->resultCount =
1179                 &m_client->m_last_resultCount;
1180             send_to_client(new_apdu);
1181             return 0;
1182         }
1183         else
1184         {
1185             Z_NamePlusRecordList *npr;
1186             int toget = m_client->m_last_resultCount;
1187             Z_RecordComposition *comp = 0;
1188             // small set
1189             // send a present request (small set)
1190
1191             if (sr->smallSetElementSetNames)
1192             {
1193                 comp = (Z_RecordComposition *)
1194                     odr_malloc(odr_encode(), sizeof(Z_RecordComposition));
1195                 comp->which = Z_RecordComp_simple;
1196                 comp->u.simple = sr->smallSetElementSetNames;
1197             }
1198
1199             if (m_client->m_cache.lookup (odr_encode(), &npr, 1, toget,
1200                                           sr->preferredRecordSyntax, comp))
1201             {
1202                 yaz_log (LOG_LOG, "%sReturned cached records for small set",
1203                          m_session_str);
1204                 Z_APDU *new_apdu = create_Z_PDU(Z_APDU_searchResponse);
1205                 new_apdu->u.searchResponse->referenceId = sr->referenceId;
1206                 new_apdu->u.searchResponse->resultCount =
1207                     &m_client->m_last_resultCount;
1208
1209                 new_apdu->u.searchResponse->numberOfRecordsReturned
1210                     = odr_intdup(odr_encode(), toget);
1211
1212                 new_apdu->u.searchResponse->presentStatus =
1213                     odr_intdup(odr_encode(), Z_PresentStatus_success);
1214                 new_apdu->u.searchResponse->records = (Z_Records*)
1215                     odr_malloc(odr_encode(), sizeof(Z_Records));
1216                 new_apdu->u.searchResponse->records->which = Z_Records_DBOSD;
1217                 new_apdu->u.searchResponse->records->u.databaseOrSurDiagnostics = npr;
1218                 new_apdu->u.searchResponse->nextResultSetPosition =
1219                     odr_intdup(odr_encode(), toget+1);
1220                 send_to_client(new_apdu);
1221                 return 0;
1222             }
1223             else
1224             {
1225                 yaz_log (LOG_LOG, "%sOptimizing search for small set",
1226                          m_session_str);
1227                 Z_APDU *new_apdu = create_Z_PDU(Z_APDU_presentRequest);
1228                 Z_PresentRequest *pr = new_apdu->u.presentRequest;
1229                 pr->referenceId = sr->referenceId;
1230                 pr->resultSetId = sr->resultSetName;
1231                 pr->preferredRecordSyntax = sr->preferredRecordSyntax;
1232                 *pr->numberOfRecordsRequested = toget;
1233                 pr->recordComposition = comp;
1234                 m_client->m_sr_transform = 1;
1235                 return new_apdu;
1236             }
1237         }
1238     }
1239     else  // query doesn't match
1240     {
1241         delete m_client->m_last_query;
1242         m_client->m_last_query = this_query;
1243         m_client->m_last_ok = 0;
1244         m_client->m_cache.clear();
1245         m_client->m_resultSetStartPoint = 0;
1246
1247         xfree (m_client->m_last_resultSetId);
1248         m_client->m_last_resultSetId = xstrdup (sr->resultSetName);
1249
1250         m_client->m_last_databases.set(sr->num_databaseNames,
1251                                        (const char **) sr->databaseNames);
1252     }
1253     return apdu;
1254 }
1255
1256
1257 void Yaz_Proxy::inc_request_no()
1258 {
1259     char *cp = strchr(m_session_str, ' ');
1260     m_request_no++;
1261     if (cp)
1262         sprintf(cp+1, "%d ", m_request_no);
1263 }
1264
1265 void Yaz_Proxy::recv_GDU(Z_GDU *apdu, int len)
1266 {
1267     inc_request_no();
1268
1269     m_bytes_recv += len;
1270
1271     if (m_log_mask & PROXY_LOG_APDU_CLIENT)
1272         yaz_log (LOG_DEBUG, "%sReceiving %s from client %d bytes",
1273                  m_session_str, gdu_name(apdu), len);
1274
1275     if (m_bw_hold_PDU)     // double incoming PDU. shutdown now.
1276         shutdown();
1277
1278     m_bw_stat.add_bytes(len);
1279     m_pdu_stat.add_bytes(1);
1280
1281     gettimeofday(&m_time_tv, 0);
1282
1283     int bw_total = m_bw_stat.get_total();
1284     int pdu_total = m_pdu_stat.get_total();
1285
1286     int reduce = 0;
1287     if (m_bw_max)
1288     {
1289         if (bw_total > m_bw_max)
1290         {
1291             reduce = (bw_total/m_bw_max);
1292         }
1293     }
1294     if (m_pdu_max)
1295     {
1296         if (pdu_total > m_pdu_max)
1297         {
1298             int nreduce = (m_pdu_max >= 60) ? 1 : 60/m_pdu_max;
1299             reduce = (reduce > nreduce) ? reduce : nreduce;
1300         }
1301     }
1302     if (reduce)
1303     {
1304         yaz_log(LOG_LOG, "%sdelay=%d bw=%d pdu=%d limit-bw=%d limit-pdu=%d",
1305                 m_session_str, reduce, bw_total, pdu_total,
1306                 m_bw_max, m_pdu_max);
1307
1308         m_bw_hold_PDU = apdu;  // save PDU and signal "on hold"
1309         timeout(reduce);       // call us reduce seconds later
1310     }
1311     else if (apdu->which == Z_GDU_Z3950)
1312         handle_incoming_Z_PDU(apdu->u.z3950);
1313     else if (apdu->which == Z_GDU_HTTP_Request)
1314         handle_incoming_HTTP(apdu->u.HTTP_Request);
1315 }
1316
1317 void Yaz_Proxy::handle_max_record_retrieve(Z_APDU *apdu)
1318 {
1319     if (m_max_record_retrieve)
1320     {
1321         if (apdu->which == Z_APDU_presentRequest)
1322         {
1323             Z_PresentRequest *pr = apdu->u.presentRequest;
1324             if (pr->numberOfRecordsRequested &&
1325                 *pr->numberOfRecordsRequested > m_max_record_retrieve)
1326                 *pr->numberOfRecordsRequested = m_max_record_retrieve;
1327         }
1328     }
1329 }
1330
1331 Z_Records *Yaz_Proxy::create_nonSurrogateDiagnostics(ODR odr,
1332                                                      int error,
1333                                                      const char *addinfo)
1334 {
1335     Z_Records *rec = (Z_Records *)
1336         odr_malloc (odr, sizeof(*rec));
1337     int *err = (int *)
1338         odr_malloc (odr, sizeof(*err));
1339     Z_DiagRec *drec = (Z_DiagRec *)
1340         odr_malloc (odr, sizeof(*drec));
1341     Z_DefaultDiagFormat *dr = (Z_DefaultDiagFormat *)
1342         odr_malloc (odr, sizeof(*dr));
1343     *err = error;
1344     rec->which = Z_Records_NSD;
1345     rec->u.nonSurrogateDiagnostic = dr;
1346     dr->diagnosticSetId =
1347         yaz_oidval_to_z3950oid (odr, CLASS_DIAGSET, VAL_BIB1);
1348     dr->condition = err;
1349     dr->which = Z_DefaultDiagFormat_v2Addinfo;
1350     dr->u.v2Addinfo = odr_strdup (odr, addinfo ? addinfo : "");
1351     return rec;
1352 }
1353
1354 Z_APDU *Yaz_Proxy::handle_query_transformation(Z_APDU *apdu)
1355 {
1356     if (apdu->which == Z_APDU_searchRequest &&
1357         apdu->u.searchRequest->query &&
1358         apdu->u.searchRequest->query->which == Z_Query_type_104 &&
1359         apdu->u.searchRequest->query->u.type_104->which == Z_External_CQL)
1360     {
1361         Z_RPNQuery *rpnquery = 0;
1362         Z_SearchRequest *sr = apdu->u.searchRequest;
1363         char *addinfo = 0;
1364
1365         yaz_log(LOG_LOG, "%sCQL: %s", m_session_str,
1366                 sr->query->u.type_104->u.cql);
1367
1368         int r = m_cql2rpn.query_transform(sr->query->u.type_104->u.cql,
1369                                           &rpnquery, odr_encode(),
1370                                           &addinfo);
1371         if (r == -3)
1372             yaz_log(LOG_LOG, "%sNo CQL to RPN table", m_session_str);
1373         else if (r)
1374         {
1375             yaz_log(LOG_LOG, "%sCQL Conversion error %d", m_session_str, r);
1376             Z_APDU *new_apdu = create_Z_PDU(Z_APDU_searchResponse);
1377
1378             new_apdu->u.searchResponse->referenceId = sr->referenceId;
1379             new_apdu->u.searchResponse->records =
1380                 create_nonSurrogateDiagnostics(odr_encode(),
1381                                                yaz_diag_srw_to_bib1(r),
1382                                                addinfo);
1383             *new_apdu->u.searchResponse->searchStatus = 0;
1384
1385             send_to_client(new_apdu);
1386
1387             return 0;
1388         }
1389         else
1390         {
1391             sr->query->which = Z_Query_type_1;
1392             sr->query->u.type_1 = rpnquery;
1393         }
1394         return apdu;
1395     }
1396     return apdu;
1397 }
1398
1399 Z_APDU *Yaz_Proxy::handle_query_validation(Z_APDU *apdu)
1400 {
1401     if (apdu->which == Z_APDU_searchRequest)
1402     {
1403         Z_SearchRequest *sr = apdu->u.searchRequest;
1404         int err = 0;
1405         char *addinfo = 0;
1406
1407         Yaz_ProxyConfig *cfg = check_reconfigure();
1408         if (cfg)
1409             err = cfg->check_query(odr_encode(), m_default_target,
1410                                    sr->query, &addinfo);
1411         if (err)
1412         {
1413             Z_APDU *new_apdu = create_Z_PDU(Z_APDU_searchResponse);
1414
1415             new_apdu->u.searchResponse->referenceId = sr->referenceId;
1416             new_apdu->u.searchResponse->records =
1417                 create_nonSurrogateDiagnostics(odr_encode(), err, addinfo);
1418             *new_apdu->u.searchResponse->searchStatus = 0;
1419
1420             send_to_client(new_apdu);
1421
1422             return 0;
1423         }
1424     }
1425     return apdu;
1426 }
1427
1428 Z_APDU *Yaz_Proxy::handle_syntax_validation(Z_APDU *apdu)
1429 {
1430     m_marcxml_flag = 0;
1431     if (apdu->which == Z_APDU_searchRequest)
1432     {
1433         Z_SearchRequest *sr = apdu->u.searchRequest;
1434         int err = 0;
1435         char *addinfo = 0;
1436         Yaz_ProxyConfig *cfg = check_reconfigure();
1437
1438         Z_RecordComposition rc_temp, *rc = 0;
1439         if (sr->smallSetElementSetNames)
1440         {
1441             rc_temp.which = Z_RecordComp_simple;
1442             rc_temp.u.simple = sr->smallSetElementSetNames;
1443             rc = &rc_temp;
1444         }
1445
1446         if (cfg)
1447             err = cfg->check_syntax(odr_encode(),
1448                                     m_default_target,
1449                                     sr->preferredRecordSyntax, rc,
1450                                     &addinfo, &m_stylesheet);
1451         if (err == -1)
1452         {
1453             sr->preferredRecordSyntax =
1454                 yaz_oidval_to_z3950oid(odr_encode(), CLASS_RECSYN, VAL_USMARC);
1455             m_marcxml_flag = 1;
1456         }
1457         else if (err)
1458         {
1459             Z_APDU *new_apdu = create_Z_PDU(Z_APDU_searchResponse);
1460
1461             new_apdu->u.searchResponse->referenceId = sr->referenceId;
1462             new_apdu->u.searchResponse->records =
1463                 create_nonSurrogateDiagnostics(odr_encode(), err, addinfo);
1464             *new_apdu->u.searchResponse->searchStatus = 0;
1465
1466             send_to_client(new_apdu);
1467
1468             return 0;
1469         }
1470     }
1471     else if (apdu->which == Z_APDU_presentRequest)
1472     {
1473         Z_PresentRequest *pr = apdu->u.presentRequest;
1474         int err = 0;
1475         char *addinfo = 0;
1476         Yaz_ProxyConfig *cfg = check_reconfigure();
1477
1478         if (cfg)
1479             err = cfg->check_syntax(odr_encode(), m_default_target,
1480                                     pr->preferredRecordSyntax,
1481                                     pr->recordComposition,
1482                                     &addinfo, &m_stylesheet);
1483         if (err == -1)
1484         {
1485             pr->preferredRecordSyntax =
1486                 yaz_oidval_to_z3950oid(odr_decode(), CLASS_RECSYN, VAL_USMARC);
1487             m_marcxml_flag = 1;
1488         }
1489         else if (err)
1490         {
1491             Z_APDU *new_apdu = create_Z_PDU(Z_APDU_presentResponse);
1492
1493             new_apdu->u.presentResponse->referenceId = pr->referenceId;
1494             new_apdu->u.presentResponse->records =
1495                 create_nonSurrogateDiagnostics(odr_encode(), err, addinfo);
1496             *new_apdu->u.presentResponse->presentStatus =
1497                 Z_PresentStatus_failure;
1498
1499             send_to_client(new_apdu);
1500
1501             return 0;
1502         }
1503     }
1504     return apdu;
1505 }
1506
1507 Z_ElementSetNames *Yaz_Proxy::mk_esn_from_schema(ODR o, const char *schema)
1508 {
1509     if (!schema)
1510         return 0;
1511     Z_ElementSetNames *esn = (Z_ElementSetNames *)
1512         odr_malloc(o, sizeof(Z_ElementSetNames));
1513     esn->which = Z_ElementSetNames_generic;
1514     esn->u.generic = odr_strdup(o, schema);
1515     return esn;
1516 }
1517
1518 void Yaz_Proxy::handle_incoming_HTTP(Z_HTTP_Request *hreq)
1519 {
1520
1521     if (m_s2z_odr_init)
1522     {
1523         odr_destroy(m_s2z_odr_init);
1524         m_s2z_odr_init = 0;
1525     }
1526     if (m_s2z_odr_search)
1527     {
1528         odr_destroy(m_s2z_odr_search);
1529         m_s2z_odr_search = 0;
1530     }
1531
1532     m_http_keepalive = 0;
1533     m_http_version = 0;
1534     if (!strcmp(hreq->version, "1.0"))
1535     {
1536         const char *v = z_HTTP_header_lookup(hreq->headers, "Connection");
1537         if (v && !strcmp(v, "Keep-Alive"))
1538             m_http_keepalive = 1;
1539         else
1540             m_http_keepalive = 0;
1541         m_http_version = "1.0";
1542     }
1543     else
1544     {
1545         const char *v = z_HTTP_header_lookup(hreq->headers, "Connection");
1546         if (v && !strcmp(v, "close"))
1547             m_http_keepalive = 0;
1548         else
1549             m_http_keepalive = 1;
1550         m_http_version = "1.1";
1551     }
1552
1553     Z_SRW_PDU *srw_pdu = 0;
1554     Z_SOAP *soap_package = 0;
1555     char *charset = 0;
1556     if (yaz_srw_decode(hreq, &srw_pdu, &soap_package, odr_decode(),
1557                        &charset) == 0
1558         || yaz_sru_decode(hreq, &srw_pdu, &soap_package, odr_decode(),
1559                           &charset) == 0)
1560     {
1561         m_s2z_odr_init = odr_createmem(ODR_ENCODE);
1562         m_s2z_odr_search = odr_createmem(ODR_ENCODE);
1563         m_soap_ns = odr_strdup(m_s2z_odr_search, soap_package->ns);
1564         m_s2z_init_apdu = 0;
1565         m_s2z_search_apdu = 0;
1566         m_s2z_present_apdu = 0;
1567         if (srw_pdu->which == Z_SRW_searchRetrieve_request)
1568         {
1569             Z_SRW_searchRetrieveRequest *srw_req = srw_pdu->u.request;
1570
1571             // set packing for response records ..
1572             if (srw_req->recordPacking &&
1573                 !strcmp(srw_req->recordPacking, "xml"))
1574                 m_s2z_packing = Z_SRW_recordPacking_XML;
1575             else
1576                 m_s2z_packing = Z_SRW_recordPacking_string;
1577
1578             // prepare search PDU
1579             m_s2z_search_apdu = zget_APDU(m_s2z_odr_search,
1580                                           Z_APDU_searchRequest);
1581             Z_SearchRequest *z_searchRequest =
1582                 m_s2z_search_apdu->u.searchRequest;
1583
1584             z_searchRequest->num_databaseNames = 1;
1585             z_searchRequest->databaseNames = (char**)
1586                 odr_malloc(m_s2z_odr_search, sizeof(char *));
1587             z_searchRequest->databaseNames[0] = odr_strdup(m_s2z_odr_search,
1588                                                            srw_req->database);
1589
1590             // query transformation
1591             Z_Query *query = (Z_Query *)
1592                 odr_malloc(m_s2z_odr_search, sizeof(Z_Query));
1593             z_searchRequest->query = query;
1594
1595             if (srw_req->query_type == Z_SRW_query_type_cql)
1596             {
1597                 Z_External *ext = (Z_External *)
1598                     odr_malloc(m_s2z_odr_search, sizeof(*ext));
1599                 ext->direct_reference =
1600                     odr_getoidbystr(m_s2z_odr_search, "1.2.840.10003.16.2");
1601                 ext->indirect_reference = 0;
1602                 ext->descriptor = 0;
1603                 ext->which = Z_External_CQL;
1604                 ext->u.cql = srw_req->query.cql;
1605
1606                 query->which = Z_Query_type_104;
1607                 query->u.type_104 =  ext;
1608             }
1609             else if (srw_req->query_type == Z_SRW_query_type_pqf)
1610             {
1611                 Z_RPNQuery *RPNquery;
1612                 YAZ_PQF_Parser pqf_parser;
1613
1614                 pqf_parser = yaz_pqf_create ();
1615
1616                 RPNquery = yaz_pqf_parse (pqf_parser, m_s2z_odr_search,
1617                                           srw_req->query.pqf);
1618                 if (!RPNquery)
1619                 {
1620                     const char *pqf_msg;
1621                     size_t off;
1622                     int code = yaz_pqf_error (pqf_parser, &pqf_msg, &off);
1623                     yaz_log(LOG_LOG, "%*s^\n", off+4, "");
1624                     yaz_log(LOG_LOG, "Bad PQF: %s (code %d)\n", pqf_msg, code);
1625
1626                     send_to_srw_client_error(10);
1627                     return;
1628                 }
1629                 query->which = Z_Query_type_1;
1630                 query->u.type_1 =  RPNquery;
1631
1632                 yaz_pqf_destroy (pqf_parser);
1633             }
1634             else
1635             {
1636                 send_to_srw_client_error(11);
1637                 return;
1638             }
1639
1640             // present
1641             m_s2z_present_apdu = 0;
1642             int max = 0;
1643             if (srw_req->maximumRecords)
1644                 max = *srw_req->maximumRecords;
1645             int start = 1;
1646             if (srw_req->startRecord)
1647                 start = *srw_req->startRecord;
1648             if (max > 0)
1649             {
1650                 // Some backend, such as Voyager doesn't honor piggyback
1651                 // So we use present always (0 &&).
1652                 if (0 && start <= 1)  // Z39.50 piggyback
1653                 {
1654                     *z_searchRequest->smallSetUpperBound = max;
1655                     *z_searchRequest->mediumSetPresentNumber = max;
1656                     *z_searchRequest->largeSetLowerBound = 2000000000; // 2e9
1657
1658                     z_searchRequest->preferredRecordSyntax =
1659                         yaz_oidval_to_z3950oid(m_s2z_odr_search, CLASS_RECSYN,
1660                                                VAL_TEXT_XML);
1661                     if (srw_req->recordSchema)
1662                     {
1663                         z_searchRequest->smallSetElementSetNames =
1664                             z_searchRequest->mediumSetElementSetNames =
1665                             mk_esn_from_schema(m_s2z_odr_search,
1666                                                srw_req->recordSchema);
1667                     }
1668                 }
1669                 else   // Z39.50 present
1670                 {
1671                     m_s2z_present_apdu = zget_APDU(m_s2z_odr_search,
1672                                                    Z_APDU_presentRequest);
1673                     Z_PresentRequest *z_presentRequest =
1674                         m_s2z_present_apdu->u.presentRequest;
1675                     *z_presentRequest->resultSetStartPoint = start;
1676                     *z_presentRequest->numberOfRecordsRequested = max;
1677                     z_presentRequest->preferredRecordSyntax =
1678                         yaz_oidval_to_z3950oid(m_s2z_odr_search, CLASS_RECSYN,
1679                                                VAL_TEXT_XML);
1680                     z_presentRequest->recordComposition =
1681                         (Z_RecordComposition *)
1682                         odr_malloc(m_s2z_odr_search,
1683                                    sizeof(Z_RecordComposition));
1684                     if (srw_req->recordSchema)
1685                     {
1686                         z_presentRequest->recordComposition->which =
1687                             Z_RecordComp_simple;
1688                         z_presentRequest->recordComposition->u.simple =
1689                             mk_esn_from_schema(m_s2z_odr_search,
1690                                                srw_req->recordSchema);
1691                     }
1692                 }
1693             }
1694             if (!m_client)
1695             {
1696                 m_s2z_init_apdu = zget_APDU(m_s2z_odr_init,
1697                                             Z_APDU_initRequest);
1698
1699                 // prevent m_initRequest_apdu memory from being grabbed
1700                 // in Yaz_Proxy::handle_incoming_Z_PDU
1701                 m_initRequest_apdu = m_s2z_init_apdu;
1702                 handle_incoming_Z_PDU(m_s2z_init_apdu);
1703                 return;
1704             }
1705             else
1706             {
1707                 handle_incoming_Z_PDU(m_s2z_search_apdu);
1708                 return;
1709             }
1710         }
1711         else if (srw_pdu->which == Z_SRW_explain_request)
1712         {
1713             Z_SRW_explainRequest *srw_req = srw_pdu->u.explain_request;
1714
1715             if (srw_req->recordPacking &&
1716                 !strcmp(srw_req->recordPacking, "xml"))
1717                 m_s2z_packing = Z_SRW_recordPacking_XML;
1718             else
1719                 m_s2z_packing = Z_SRW_recordPacking_string;
1720
1721             if (!m_client)
1722             {
1723                 yaz_log(LOG_LOG, "handle_incoming: initRequest");
1724                 m_s2z_init_apdu = zget_APDU(m_s2z_odr_init,
1725                                             Z_APDU_initRequest);
1726
1727                 // prevent m_initRequest_apdu memory from being grabbed
1728                 // in Yaz_Proxy::handle_incoming_Z_PDU
1729                 m_initRequest_apdu = m_s2z_init_apdu;
1730                 handle_incoming_Z_PDU(m_s2z_init_apdu);
1731             }
1732             else
1733                 send_srw_explain();
1734             return;
1735         }
1736     }
1737     int len = 0;
1738     Z_GDU *p = z_get_HTTP_Response(odr_encode(), 400);
1739     send_GDU(p, &len);
1740     timeout(1);
1741 }
1742
1743 void Yaz_Proxy::handle_incoming_Z_PDU(Z_APDU *apdu)
1744 {
1745     if (!m_client && m_invalid_session)
1746     {
1747         m_apdu_invalid_session = apdu;
1748         m_mem_invalid_session = odr_extract_mem(odr_decode());
1749         apdu = m_initRequest_apdu;
1750     }
1751
1752     // Determine our client.
1753     Z_OtherInformation **oi;
1754     get_otherInfoAPDU(apdu, &oi);
1755     m_client = get_client(apdu, get_cookie(oi), get_proxy(oi));
1756     if (!m_client)
1757     {
1758         delete this;
1759         return;
1760     }
1761     m_client->m_server = this;
1762
1763     if (apdu->which == Z_APDU_initRequest)
1764     {
1765         if (apdu->u.initRequest->implementationId)
1766             yaz_log(LOG_LOG, "%simplementationId: %s",
1767                     m_session_str, apdu->u.initRequest->implementationId);
1768         if (apdu->u.initRequest->implementationName)
1769             yaz_log(LOG_LOG, "%simplementationName: %s",
1770                     m_session_str, apdu->u.initRequest->implementationName);
1771         if (apdu->u.initRequest->implementationVersion)
1772             yaz_log(LOG_LOG, "%simplementationVersion: %s",
1773                     m_session_str, apdu->u.initRequest->implementationVersion);
1774         if (m_initRequest_apdu == 0)
1775         {
1776             if (m_initRequest_mem)
1777                 nmem_destroy(m_initRequest_mem);
1778             m_initRequest_apdu = apdu;
1779             m_initRequest_mem = odr_extract_mem(odr_decode());
1780         }
1781         if (m_client->m_init_flag)
1782         {
1783             if (handle_init_response_for_invalid_session(apdu))
1784                 return;
1785             Z_APDU *apdu2 = m_client->m_initResponse;
1786             apdu2->u.initResponse->otherInfo = 0;
1787             if (m_client->m_cookie && *m_client->m_cookie)
1788                 set_otherInformationString(apdu2, VAL_COOKIE, 1,
1789                                            m_client->m_cookie);
1790             apdu2->u.initResponse->referenceId =
1791                 apdu->u.initRequest->referenceId;
1792             send_to_client(apdu2);
1793             return;
1794         }
1795         m_client->m_init_flag = 1;
1796     }
1797     handle_max_record_retrieve(apdu);
1798
1799     if (apdu)
1800         apdu = handle_syntax_validation(apdu);
1801
1802     if (apdu)
1803         apdu = handle_query_transformation(apdu);
1804
1805     if (apdu)
1806         apdu = handle_query_validation(apdu);
1807
1808     if (apdu)
1809         apdu = result_set_optimize(apdu);
1810     if (!apdu)
1811     {
1812         m_client->timeout(m_target_idletime);  // mark it active even
1813         // though we didn't use it
1814         return;
1815     }
1816
1817     // delete other info part from PDU before sending to target
1818     get_otherInfoAPDU(apdu, &oi);
1819     if (oi)
1820         *oi = 0;
1821
1822     if (apdu->which == Z_APDU_presentRequest &&
1823         m_client->m_resultSetStartPoint == 0)
1824     {
1825         Z_PresentRequest *pr = apdu->u.presentRequest;
1826         m_client->m_resultSetStartPoint = *pr->resultSetStartPoint;
1827         m_client->m_cache.copy_presentRequest(apdu->u.presentRequest);
1828     } else {
1829         m_client->m_resultSetStartPoint = 0;
1830     }
1831     if (m_client->send_to_target(apdu) < 0)
1832     {
1833         delete m_client;
1834         m_client = 0;
1835         delete this;
1836     }
1837     else
1838         m_client->m_waiting = 1;
1839 }
1840
1841 void Yaz_Proxy::connectNotify()
1842 {
1843 }
1844
1845 void Yaz_Proxy::shutdown()
1846 {
1847     m_invalid_session = 0;
1848     // only keep if keep_alive flag is set...
1849     if (m_client &&
1850         m_client->m_pdu_recv < m_keepalive_limit_pdu &&
1851         m_client->m_bytes_recv+m_client->m_bytes_sent < m_keepalive_limit_bw &&
1852         m_client->m_waiting == 0)
1853     {
1854         yaz_log(LOG_LOG, "%sShutdown (client to proxy) keepalive %s",
1855                  m_session_str,
1856                  m_client->get_hostname());
1857         yaz_log(LOG_LOG, "%sbw=%d pdu=%d limit-bw=%d limit-pdu=%d",
1858                 m_session_str, m_client->m_pdu_recv,
1859                 m_client->m_bytes_sent + m_client->m_bytes_recv,
1860                 m_keepalive_limit_bw, m_keepalive_limit_pdu);
1861         assert (m_client->m_waiting != 2);
1862         // Tell client (if any) that no server connection is there..
1863         m_client->m_server = 0;
1864         m_invalid_session = 0;
1865     }
1866     else if (m_client)
1867     {
1868         yaz_log (LOG_LOG, "%sShutdown (client to proxy) close %s",
1869                  m_session_str,
1870                  m_client->get_hostname());
1871         assert (m_client->m_waiting != 2);
1872         delete m_client;
1873     }
1874     else if (!m_parent)
1875     {
1876         yaz_log (LOG_LOG, "%sshutdown (client to proxy) bad state",
1877                  m_session_str);
1878         assert (m_parent);
1879     }
1880     else
1881     {
1882         yaz_log (LOG_LOG, "%sShutdown (client to proxy)",
1883                  m_session_str);
1884     }
1885     if (m_parent)
1886         m_parent->pre_init();
1887     delete this;
1888 }
1889
1890 const char *Yaz_ProxyClient::get_session_str()
1891 {
1892     if (!m_server)
1893         return "0 ";
1894     return m_server->get_session_str();
1895 }
1896
1897 void Yaz_ProxyClient::shutdown()
1898 {
1899     yaz_log (LOG_LOG, "%sShutdown (proxy to target) %s", get_session_str(),
1900              get_hostname());
1901     delete m_server;
1902     delete this;
1903 }
1904
1905 void Yaz_Proxy::failNotify()
1906 {
1907     inc_request_no();
1908     yaz_log (LOG_LOG, "%sConnection closed by client",
1909              get_session_str());
1910     shutdown();
1911 }
1912
1913 void Yaz_ProxyClient::failNotify()
1914 {
1915     if (m_server)
1916         m_server->inc_request_no();
1917     yaz_log (LOG_LOG, "%sConnection closed by target %s",
1918              get_session_str(), get_hostname());
1919     shutdown();
1920 }
1921
1922 void Yaz_ProxyClient::connectNotify()
1923 {
1924     const char *s = get_session_str();
1925     const char *h = get_hostname();
1926     yaz_log (LOG_LOG, "%sConnection accepted by %s timeout=%d", s, h,
1927              m_target_idletime);
1928     timeout(m_target_idletime);
1929     if (!m_server)
1930         pre_init_client();
1931 }
1932
1933 IYaz_PDU_Observer *Yaz_ProxyClient::sessionNotify(IYaz_PDU_Observable
1934                                                   *the_PDU_Observable, int fd)
1935 {
1936     return new Yaz_ProxyClient(the_PDU_Observable, 0);
1937 }
1938
1939 Yaz_ProxyClient::~Yaz_ProxyClient()
1940 {
1941     if (m_prev)
1942         *m_prev = m_next;
1943     if (m_next)
1944         m_next->m_prev = m_prev;
1945     m_waiting = 2;     // for debugging purposes only.
1946     odr_destroy(m_init_odr);
1947     delete m_last_query;
1948     xfree (m_last_resultSetId);
1949     xfree (m_cookie);
1950 }
1951
1952 void Yaz_ProxyClient::pre_init_client()
1953 {
1954     Z_APDU *apdu = create_Z_PDU(Z_APDU_initRequest);
1955     Z_InitRequest *req = apdu->u.initRequest;
1956
1957     ODR_MASK_SET(req->options, Z_Options_search);
1958     ODR_MASK_SET(req->options, Z_Options_present);
1959     ODR_MASK_SET(req->options, Z_Options_namedResultSets);
1960     ODR_MASK_SET(req->options, Z_Options_triggerResourceCtrl);
1961     ODR_MASK_SET(req->options, Z_Options_scan);
1962     ODR_MASK_SET(req->options, Z_Options_sort);
1963     ODR_MASK_SET(req->options, Z_Options_extendedServices);
1964     ODR_MASK_SET(req->options, Z_Options_delSet);
1965
1966     ODR_MASK_SET(req->protocolVersion, Z_ProtocolVersion_1);
1967     ODR_MASK_SET(req->protocolVersion, Z_ProtocolVersion_2);
1968     ODR_MASK_SET(req->protocolVersion, Z_ProtocolVersion_3);
1969
1970     if (send_to_target(apdu) < 0)
1971     {
1972         delete this;
1973     }
1974     else
1975     {
1976         m_waiting = 1;
1977         m_init_flag = 1;
1978     }
1979 }
1980
1981 void Yaz_Proxy::pre_init()
1982 {
1983     int i;
1984     const char *name = 0;
1985     const char *zurl_in_use[MAX_ZURL_PLEX];
1986     int limit_bw, limit_pdu, limit_req;
1987     int target_idletime, client_idletime;
1988     int max_clients;
1989     int keepalive_limit_bw, keepalive_limit_pdu;
1990     int pre_init;
1991     const char *cql2rpn = 0;
1992     const char *zeerex = 0;
1993
1994     Yaz_ProxyConfig *cfg = check_reconfigure();
1995
1996     zurl_in_use[0] = 0;
1997
1998     if (m_log_mask & PROXY_LOG_APDU_CLIENT)
1999         set_APDU_yazlog(1);
2000     else
2001         set_APDU_yazlog(0);
2002
2003     for (i = 0; cfg && cfg->get_target_no(i, &name, zurl_in_use,
2004                                           &limit_bw, &limit_pdu, &limit_req,
2005                                           &target_idletime, &client_idletime,
2006                                           &max_clients,
2007                                           &keepalive_limit_bw,
2008                                           &keepalive_limit_pdu,
2009                                           &pre_init,
2010                                           &cql2rpn) ; i++)
2011     {
2012         if (pre_init)
2013         {
2014             int j;
2015             for (j = 0; zurl_in_use[j]; j++)
2016             {
2017                 Yaz_ProxyClient *c;
2018                 int spare = 0;
2019                 int in_use = 0;
2020                 int other = 0;
2021                 for (c = m_clientPool; c; c = c->m_next)
2022                 {
2023                     if (!strcmp(zurl_in_use[j], c->get_hostname()))
2024                     {
2025                         if (c->m_cookie == 0)
2026                         {
2027                             if (c->m_server == 0)
2028                                 spare++;
2029                             else
2030                                 in_use++;
2031                         }
2032                         else
2033                             other++;
2034                     }
2035                 }
2036                 yaz_log(LOG_LOG, "%spre-init %s %s use=%d other=%d spare=%d "
2037                         "preinit=%d",m_session_str,
2038                         name, zurl_in_use[j], in_use, other, spare, pre_init);
2039                 if (spare < pre_init)
2040                 {
2041                     c = new Yaz_ProxyClient(m_PDU_Observable->clone(), this);
2042                     c->m_next = m_clientPool;
2043                     if (c->m_next)
2044                         c->m_next->m_prev = &c->m_next;
2045                     m_clientPool = c;
2046                     c->m_prev = &m_clientPool;
2047
2048                     if (m_log_mask & PROXY_LOG_APDU_SERVER)
2049                         c->set_APDU_yazlog(1);
2050                     else
2051                         c->set_APDU_yazlog(0);
2052
2053                     if (c->client(zurl_in_use[j]))
2054                     {
2055                         timeout(60);
2056                         delete c;
2057                         return;
2058                     }
2059                     c->timeout(30);
2060                     c->m_waiting = 1;
2061                     c->m_target_idletime = target_idletime;
2062                     c->m_seqno = m_seqno++;
2063                 }
2064             }
2065         }
2066     }
2067 }
2068
2069 void Yaz_Proxy::timeoutNotify()
2070 {
2071     if (m_parent)
2072     {
2073         if (m_bw_hold_PDU)
2074         {
2075             timeout(m_client_idletime);
2076             Z_GDU *apdu = m_bw_hold_PDU;
2077             m_bw_hold_PDU = 0;
2078
2079             if (apdu->which == Z_GDU_Z3950)
2080                 handle_incoming_Z_PDU(apdu->u.z3950);
2081             else if (apdu->which == Z_GDU_HTTP_Request)
2082                 handle_incoming_HTTP(apdu->u.HTTP_Request);
2083         }
2084         else
2085         {
2086             inc_request_no();
2087
2088             yaz_log (LOG_LOG, "%sTimeout (client to proxy)", m_session_str);
2089             shutdown();
2090         }
2091     }
2092     else
2093     {
2094         timeout(600);
2095         pre_init();
2096     }
2097 }
2098
2099 void Yaz_ProxyClient::timeoutNotify()
2100 {
2101     if (m_server)
2102         m_server->inc_request_no();
2103
2104     yaz_log (LOG_LOG, "%sTimeout (proxy to target) %s", get_session_str(),
2105              get_hostname());
2106     m_waiting = 1;
2107     m_root->pre_init();
2108     shutdown();
2109 }
2110
2111 Yaz_ProxyClient::Yaz_ProxyClient(IYaz_PDU_Observable *the_PDU_Observable,
2112                                  Yaz_Proxy *parent) :
2113     Yaz_Z_Assoc (the_PDU_Observable)
2114 {
2115     m_cookie = 0;
2116     m_next = 0;
2117     m_prev = 0;
2118     m_init_flag = 0;
2119     m_last_query = 0;
2120     m_last_resultSetId = 0;
2121     m_last_resultCount = 0;
2122     m_last_ok = 0;
2123     m_sr_transform = 0;
2124     m_waiting = 0;
2125     m_init_odr = odr_createmem (ODR_DECODE);
2126     m_initResponse = 0;
2127     m_resultSetStartPoint = 0;
2128     m_bytes_sent = m_bytes_recv = 0;
2129     m_pdu_recv = 0;
2130     m_server = 0;
2131     m_seqno = 0;
2132     m_target_idletime = 600;
2133     m_root = parent;
2134 }
2135
2136 const char *Yaz_Proxy::option(const char *name, const char *value)
2137 {
2138     if (!strcmp (name, "optimize")) {
2139         if (value) {
2140             xfree (m_optimize);
2141             m_optimize = xstrdup (value);
2142         }
2143         return m_optimize;
2144     }
2145     return 0;
2146 }
2147
2148 void Yaz_ProxyClient::recv_HTTP_response(Z_HTTP_Response *apdu, int len)
2149 {
2150
2151 }
2152
2153 void Yaz_ProxyClient::recv_GDU(Z_GDU *apdu, int len)
2154 {
2155     if (apdu->which == Z_GDU_Z3950)
2156         recv_Z_PDU(apdu->u.z3950, len);
2157     else if (apdu->which == Z_GDU_HTTP_Response)
2158         recv_HTTP_response(apdu->u.HTTP_Response, len);
2159     else
2160         shutdown();
2161 }
2162
2163 int Yaz_Proxy::handle_init_response_for_invalid_session(Z_APDU *apdu)
2164 {
2165     if (!m_invalid_session)
2166         return 0;
2167     m_invalid_session = 0;
2168     handle_incoming_Z_PDU(m_apdu_invalid_session);
2169     assert (m_mem_invalid_session);
2170     nmem_destroy(m_mem_invalid_session);
2171     m_mem_invalid_session = 0;
2172     return 1;
2173 }
2174
2175 void Yaz_ProxyClient::recv_Z_PDU(Z_APDU *apdu, int len)
2176 {
2177     m_bytes_recv += len;
2178     m_pdu_recv++;
2179     m_waiting = 0;
2180     if (m_root->get_log_mask() & PROXY_LOG_REQ_SERVER)
2181         yaz_log (LOG_LOG, "%sReceiving %s from %s %d bytes", get_session_str(),
2182                  apdu_name(apdu), get_hostname(), len);
2183     if (apdu->which == Z_APDU_initResponse)
2184     {
2185         if (!m_server)  // if this is a pre init session , check for more
2186             m_root->pre_init();
2187         NMEM nmem = odr_extract_mem (odr_decode());
2188         odr_reset (m_init_odr);
2189         nmem_transfer (m_init_odr->mem, nmem);
2190         m_initResponse = apdu;
2191
2192         Z_InitResponse *ir = apdu->u.initResponse;
2193         char *im0 = ir->implementationName;
2194
2195         char *im1 = (char*)
2196             odr_malloc(m_init_odr, 20 + (im0 ? strlen(im0) : 0));
2197         *im1 = '\0';
2198         if (im0)
2199         {
2200             strcat(im1, im0);
2201             strcat(im1, " ");
2202         }
2203         strcat(im1, "(YAZ Proxy)");
2204         ir->implementationName = im1;
2205
2206         nmem_destroy (nmem);
2207
2208         if (m_server && m_server->handle_init_response_for_invalid_session(apdu))
2209             return;
2210     }
2211     if (apdu->which == Z_APDU_searchResponse)
2212     {
2213         Z_SearchResponse *sr = apdu->u.searchResponse;
2214         m_last_resultCount = *sr->resultCount;
2215         int status = *sr->searchStatus;
2216         if (status && (!sr->records || sr->records->which == Z_Records_DBOSD))
2217         {
2218             m_last_ok = 1;
2219
2220             if (sr->records && sr->records->which == Z_Records_DBOSD)
2221             {
2222                 m_cache.add(odr_decode(),
2223                             sr->records->u.databaseOrSurDiagnostics, 1,
2224                             *sr->resultCount);
2225             }
2226         }
2227     }
2228     if (apdu->which == Z_APDU_presentResponse)
2229     {
2230         Z_PresentResponse *pr = apdu->u.presentResponse;
2231         if (m_sr_transform)
2232         {
2233             m_sr_transform = 0;
2234             Z_APDU *new_apdu = create_Z_PDU(Z_APDU_searchResponse);
2235             Z_SearchResponse *sr = new_apdu->u.searchResponse;
2236             sr->referenceId = pr->referenceId;
2237             *sr->resultCount = m_last_resultCount;
2238             sr->records = pr->records;
2239             sr->nextResultSetPosition = pr->nextResultSetPosition;
2240             sr->numberOfRecordsReturned = pr->numberOfRecordsReturned;
2241             apdu = new_apdu;
2242         }
2243         if (pr->records &&
2244             pr->records->which == Z_Records_DBOSD && m_resultSetStartPoint)
2245         {
2246             m_cache.add(odr_decode(),
2247                         pr->records->u.databaseOrSurDiagnostics,
2248                         m_resultSetStartPoint, -1);
2249             m_resultSetStartPoint = 0;
2250         }
2251     }
2252     if (m_cookie)
2253         set_otherInformationString (apdu, VAL_COOKIE, 1, m_cookie);
2254     if (m_server)
2255     {
2256         m_server->send_to_client(apdu);
2257     }
2258     if (apdu->which == Z_APDU_close)
2259     {
2260         shutdown();
2261     }
2262 }
2263
2264 int Yaz_Proxy::server(const char *addr)
2265 {
2266     int r = Yaz_Z_Assoc::server(addr);
2267     if (!r)
2268     {
2269         yaz_log(LOG_LOG, "%sStarted proxy " VERSION " on %s", m_session_str, addr);
2270         timeout(1);
2271     }
2272     return r;
2273 }
2274