src/yaz-proxy.cpp

   1 /*
   2  * Copyright (c) 1998-2003, Index Data.
   3  * See the file LICENSE for details.
   4  *
   5  * $Id: yaz-proxy.cpp,v 1.71 2003-12-16 14:17:01 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 static const char *apdu_name(Z_APDU *apdu)
  20 {
  21     switch (apdu->which)
  22     {
  23     case Z_APDU_initRequest:
  24         return "initRequest";
  25     case Z_APDU_initResponse:
  26         return "initResponse";
  27     case Z_APDU_searchRequest:
  28         return "searchRequest";
  29     case Z_APDU_searchResponse:
  30         return "searchResponse";
  31     case Z_APDU_presentRequest:
  32         return "presentRequest";
  33     case Z_APDU_presentResponse:
  34         return "presentResponse";
  35     case Z_APDU_deleteResultSetRequest:
  36         return "deleteResultSetRequest";
  37     case Z_APDU_deleteResultSetResponse:
  38         return "deleteResultSetResponse";
  39     case Z_APDU_scanRequest:
  40         return "scanRequest";
  41     case Z_APDU_scanResponse:
  42         return "scanResponse";
  43     case Z_APDU_sortRequest:
  44         return "sortRequest";
  45     case Z_APDU_sortResponse:
  46         return "sortResponse";
  47     case Z_APDU_extendedServicesRequest:
  48         return "extendedServicesRequest";
  49     case Z_APDU_extendedServicesResponse:
  50         return "extendedServicesResponse";
  51     case Z_APDU_close:
  52         return "close";
  53     }
  54     return "other";
  55 }
  56
  57 static const char *gdu_name(Z_GDU *gdu)
  58 {
  59     switch(gdu->which)
  60     {
  61     case Z_GDU_Z3950:
  62         return apdu_name(gdu->u.z3950);
  63     case Z_GDU_HTTP_Request:
  64         return "HTTP Request";
  65     case Z_GDU_HTTP_Response:
  66         return "HTTP Response";
  67     }
  68     return "Unknown request/response";
  69 }
  70
  71 Yaz_Proxy::Yaz_Proxy(IYaz_PDU_Observable *the_PDU_Observable,
  72                      Yaz_Proxy *parent) :
  73     Yaz_Z_Assoc(the_PDU_Observable), m_bw_stat(60), m_pdu_stat(60)
  74 {
  75     m_PDU_Observable = the_PDU_Observable;
  76     m_client = 0;
  77     m_parent = parent;
  78     m_clientPool = 0;
  79     m_seqno = 1;
  80     m_keepalive_limit_bw = 500000;
  81     m_keepalive_limit_pdu = 1000;
  82     m_proxyTarget = 0;
  83     m_default_target = 0;
  84     m_proxy_authentication = 0;
  85     m_max_clients = 150;
  86     m_log_mask = 0;
  87     m_seed = time(0);
  88     m_client_idletime = 600;
  89     m_target_idletime = 600;
  90     m_optimize = xstrdup ("1");
  91     strcpy(m_session_str, "0 ");
  92     m_session_no=0;
  93     m_bytes_sent = m_bytes_recv = 0;
  94     m_bw_hold_PDU = 0;
  95     m_bw_max = 0;
  96     m_pdu_max = 0;
  97     m_max_record_retrieve = 0;
  98     m_reconfig_flag = 0;
  99     m_config_fname = 0;
 100     m_request_no = 0;
 101     m_invalid_session = 0;
 102     m_config = 0;
 103     m_marcxml_flag = 0;
 104     m_initRequest_apdu = 0;
 105     m_initRequest_mem = 0;
 106     m_apdu_invalid_session = 0;
 107     m_mem_invalid_session = 0;
 108     m_s2z_odr = 0;
 109     m_s2z_init_apdu = 0;
 110     m_s2z_search_apdu = 0;
 111     m_s2z_present_apdu = 0;
 112     m_http_keepalive = 0;
 113     m_http_version = 0;
 114     m_soap_ns = 0;
 115     m_s2z_packing = Z_SRW_recordPacking_string;
 116 }
 117
 118 Yaz_Proxy::~Yaz_Proxy()
 119 {
 120     yaz_log(LOG_LOG, "%sClosed %d/%d sent/recv bytes total", m_session_str,
 121             m_bytes_sent, m_bytes_recv);
 122     nmem_destroy(m_initRequest_mem);
 123     nmem_destroy(m_mem_invalid_session);
 124     xfree (m_proxyTarget);
 125     xfree (m_default_target);
 126     xfree (m_proxy_authentication);
 127     xfree (m_optimize);
 128     if (m_s2z_odr)
 129         odr_destroy(m_s2z_odr);
 130     delete m_config;
 131 }
 132
 133 int Yaz_Proxy::set_config(const char *config)
 134 {
 135     delete m_config;
 136     m_config = new Yaz_ProxyConfig();
 137     xfree(m_config_fname);
 138     m_config_fname = xstrdup(config);
 139     int r = m_config->read_xml(config);
 140     if (!r)
 141         m_config->get_generic_info(&m_log_mask, &m_max_clients);
 142     return r;
 143 }
 144
 145 void Yaz_Proxy::set_default_target(const char *target)
 146 {
 147     xfree (m_default_target);
 148     m_default_target = 0;
 149     if (target)
 150         m_default_target = (char *) xstrdup (target);
 151 }
 152
 153 void Yaz_Proxy::set_proxy_authentication (const char *auth)
 154 {
 155     xfree (m_proxy_authentication);
 156     m_proxy_authentication = 0;
 157     if (auth)
 158         m_proxy_authentication = (char *) xstrdup (auth);
 159 }
 160
 161 Yaz_ProxyConfig *Yaz_Proxy::check_reconfigure()
 162 {
 163     if (m_parent)
 164         return m_parent->check_reconfigure();
 165
 166     Yaz_ProxyConfig *cfg = m_config;
 167     if (m_reconfig_flag)
 168     {
 169         yaz_log(LOG_LOG, "reconfigure");
 170         yaz_log_reopen();
 171         if (m_config_fname && cfg)
 172         {
 173             yaz_log(LOG_LOG, "reconfigure config %s", m_config_fname);
 174             int r = cfg->read_xml(m_config_fname);
 175             if (r)
 176                 yaz_log(LOG_WARN, "reconfigure failed");
 177             else
 178             {
 179                 m_log_mask = 0;
 180                 cfg->get_generic_info(&m_log_mask, &m_max_clients);
 181             }
 182         }
 183         else
 184             yaz_log(LOG_LOG, "reconfigure");
 185         m_reconfig_flag = 0;
 186     }
 187     return cfg;
 188 }
 189
 190 IYaz_PDU_Observer *Yaz_Proxy::sessionNotify(IYaz_PDU_Observable
 191                                             *the_PDU_Observable, int fd)
 192 {
 193     check_reconfigure();
 194     Yaz_Proxy *new_proxy = new Yaz_Proxy(the_PDU_Observable, this);
 195     new_proxy->m_config = 0;
 196     new_proxy->m_config_fname = 0;
 197     new_proxy->timeout(m_client_idletime);
 198     new_proxy->m_target_idletime = m_target_idletime;
 199     new_proxy->set_default_target(m_default_target);
 200     new_proxy->m_max_clients = m_max_clients;
 201     new_proxy->m_log_mask = m_log_mask;
 202     new_proxy->set_APDU_log(get_APDU_log());
 203     if (m_log_mask & PROXY_LOG_APDU_CLIENT)
 204         new_proxy->set_APDU_yazlog(1);
 205     else
 206         new_proxy->set_APDU_yazlog(0);
 207     new_proxy->set_proxy_authentication(m_proxy_authentication);
 208     sprintf(new_proxy->m_session_str, "%ld:%d ", (long) time(0), m_session_no);
 209     m_session_no++;
 210     yaz_log (LOG_LOG, "%sNew session %s", new_proxy->m_session_str,
 211              the_PDU_Observable->getpeername());
 212     return new_proxy;
 213 }
 214
 215 char *Yaz_Proxy::get_cookie(Z_OtherInformation **otherInfo)
 216 {
 217     int oid[OID_SIZE];
 218     Z_OtherInformationUnit *oi;
 219     struct oident ent;
 220     ent.proto = PROTO_Z3950;
 221     ent.oclass = CLASS_USERINFO;
 222     ent.value = (oid_value) VAL_COOKIE;
 223     assert (oid_ent_to_oid (&ent, oid));
 224
 225     if (oid_ent_to_oid (&ent, oid) &&
 226         (oi = update_otherInformation(otherInfo, 0, oid, 1, 1)) &&
 227         oi->which == Z_OtherInfo_characterInfo)
 228         return oi->information.characterInfo;
 229     return 0;
 230 }
 231
 232 char *Yaz_Proxy::get_proxy(Z_OtherInformation **otherInfo)
 233 {
 234     int oid[OID_SIZE];
 235     Z_OtherInformationUnit *oi;
 236     struct oident ent;
 237     ent.proto = PROTO_Z3950;
 238     ent.oclass = CLASS_USERINFO;
 239     ent.value = (oid_value) VAL_PROXY;
 240     if (oid_ent_to_oid (&ent, oid) &&
 241         (oi = update_otherInformation(otherInfo, 0, oid, 1, 1)) &&
 242         oi->which == Z_OtherInfo_characterInfo)
 243         return oi->information.characterInfo;
 244     return 0;
 245 }
 246
 247 const char *Yaz_Proxy::load_balance(const char **url)
 248 {
 249     int zurl_in_use[MAX_ZURL_PLEX];
 250     Yaz_ProxyClient *c;
 251     int i;
 252
 253     for (i = 0; i<MAX_ZURL_PLEX; i++)
 254         zurl_in_use[i] = 0;
 255     for (c = m_parent->m_clientPool; c; c = c->m_next)
 256     {
 257         for (i = 0; url[i]; i++)
 258             if (!strcmp(url[i], c->get_hostname()))
 259                 zurl_in_use[i]++;
 260     }
 261     int min = 100000;
 262     const char *ret = 0;
 263     for (i = 0; url[i]; i++)
 264     {
 265         yaz_log(LOG_DEBUG, "%szurl=%s use=%d",
 266                 m_session_str, url[i], zurl_in_use[i]);
 267         if (min > zurl_in_use[i])
 268         {
 269             ret = url[i];
 270             min = zurl_in_use[i];
 271         }
 272     }
 273     return ret;
 274 }
 275
 276 Yaz_ProxyClient *Yaz_Proxy::get_client(Z_APDU *apdu, const char *cookie,
 277                                        const char *proxy_host)
 278 {
 279     assert (m_parent);
 280     Yaz_Proxy *parent = m_parent;
 281     Z_OtherInformation **oi;
 282     Yaz_ProxyClient *c = m_client;
 283
 284     if (!m_proxyTarget)
 285     {
 286         const char *url[MAX_ZURL_PLEX];
 287         Yaz_ProxyConfig *cfg = check_reconfigure();
 288         if (proxy_host)
 289         {
 290 #if 1
 291 /* only to be enabled for debugging... */
 292             if (!strcmp(proxy_host, "stop"))
 293                 exit(0);
 294 #endif
 295             xfree(m_default_target);
 296             m_default_target = xstrdup(proxy_host);
 297             proxy_host = m_default_target;
 298         }
 299         int client_idletime = -1;
 300         const char *cql2rpn_fname = 0;
 301         url[0] = m_default_target;
 302         url[1] = 0;
 303         if (cfg)
 304         {
 305             int pre_init = 0;
 306             cfg->get_target_info(proxy_host, url, &m_bw_max,
 307                                  &m_pdu_max, &m_max_record_retrieve,
 308                                  &m_target_idletime, &client_idletime,
 309                                  &parent->m_max_clients,
 310                                  &m_keepalive_limit_bw,
 311                                  &m_keepalive_limit_pdu,
 312                                  &pre_init,
 313                                  &cql2rpn_fname);
 314         }
 315         if (client_idletime != -1)
 316         {
 317             m_client_idletime = client_idletime;
 318             timeout(m_client_idletime);
 319         }
 320         if (cql2rpn_fname)
 321         {
 322             yaz_log(LOG_LOG, "set_pqf_file %s", cql2rpn_fname);
 323             m_cql2rpn.set_pqf_file(cql2rpn_fname);
 324         }
 325         if (!url[0])
 326         {
 327             yaz_log(LOG_LOG, "%sNo default target", m_session_str);
 328             return 0;
 329         }
 330         // we don't handle multiplexing for cookie session, so we just
 331         // pick the first one in this case (anonymous users will be able
 332         // to use any backend)
 333         if (cookie && *cookie)
 334             m_proxyTarget = (char*) xstrdup(url[0]);
 335         else
 336             m_proxyTarget = (char*) xstrdup(load_balance(url));
 337     }
 338     if (cookie && *cookie)
 339     {   // search in sessions with a cookie
 340         for (c = parent->m_clientPool; c; c = c->m_next)
 341         {
 342             assert (c->m_prev);
 343             assert (*c->m_prev == c);
 344             if (c->m_cookie && !strcmp(cookie,c->m_cookie) &&
 345                 !strcmp(m_proxyTarget, c->get_hostname()))
 346             {
 347                 // Found it in cache
 348                 // The following handles "cancel"
 349                 // If connection is busy (waiting for PDU) and
 350                 // we have an initRequest we can safely do re-open
 351                 if (c->m_waiting && apdu->which == Z_APDU_initRequest)
 352                 {
 353                     yaz_log (LOG_LOG, "%s REOPEN target=%s", m_session_str,
 354                              c->get_hostname());
 355                     c->close();
 356                     c->m_init_flag = 0;
 357
 358                     c->m_last_ok = 0;
 359                     c->m_cache.clear();
 360                     c->m_last_resultCount = 0;
 361                     c->m_sr_transform = 0;
 362                     c->m_waiting = 0;
 363                     c->m_resultSetStartPoint = 0;
 364                     c->m_target_idletime = m_target_idletime;
 365                     if (c->client(m_proxyTarget))
 366                     {
 367                         delete c;
 368                         return 0;
 369                     }
 370                     c->timeout(30);
 371                 }
 372                 c->m_seqno = parent->m_seqno;
 373                 if (c->m_server && c->m_server != this)
 374                     c->m_server->m_client = 0;
 375                 c->m_server = this;
 376                 (parent->m_seqno)++;
 377                 yaz_log (LOG_DEBUG, "get_client 1 %p %p", this, c);
 378                 return c;
 379             }
 380         }
 381     }
 382     else if (!c)
 383     {
 384         // don't have a client session yet. Search in session w/o cookie
 385         for (c = parent->m_clientPool; c; c = c->m_next)
 386         {
 387             assert (c->m_prev);
 388             assert (*c->m_prev == c);
 389             if (c->m_server == 0 && c->m_cookie == 0 &&
 390                 c->m_waiting == 0 &&
 391                 !strcmp(m_proxyTarget, c->get_hostname()))
 392             {
 393                 // found it in cache
 394                 yaz_log (LOG_LOG, "%sREUSE %s",
 395                          m_session_str, c->get_hostname());
 396
 397                 c->m_seqno = parent->m_seqno;
 398                 assert(c->m_server == 0);
 399                 c->m_server = this;
 400
 401                 if (parent->m_log_mask & PROXY_LOG_APDU_SERVER)
 402                     c->set_APDU_yazlog(1);
 403                 else
 404                     c->set_APDU_yazlog(0);
 405
 406                 (parent->m_seqno)++;
 407
 408                 parent->pre_init();
 409
 410                 return c;
 411             }
 412         }
 413     }
 414     if (!m_client)
 415     {
 416         if (apdu->which != Z_APDU_initRequest)
 417         {
 418             yaz_log (LOG_LOG, "no first INIT!");
 419             return 0;
 420         }
 421         Z_InitRequest *initRequest = apdu->u.initRequest;
 422
 423         if (!initRequest->idAuthentication)
 424         {
 425             if (m_proxy_authentication)
 426             {
 427                 initRequest->idAuthentication =
 428                     (Z_IdAuthentication *)
 429                     odr_malloc (odr_encode(),
 430                                 sizeof(*initRequest->idAuthentication));
 431                 initRequest->idAuthentication->which =
 432                     Z_IdAuthentication_open;
 433                 initRequest->idAuthentication->u.open =
 434                     odr_strdup (odr_encode(), m_proxy_authentication);
 435             }
 436         }
 437
 438         // go through list of clients - and find the lowest/oldest one.
 439         Yaz_ProxyClient *c_min = 0;
 440         int min_seq = -1;
 441         int no_of_clients = 0;
 442         if (parent->m_clientPool)
 443             yaz_log (LOG_DEBUG, "Existing sessions");
 444         for (c = parent->m_clientPool; c; c = c->m_next)
 445         {
 446             yaz_log (LOG_DEBUG, " Session %-3d wait=%d %s cookie=%s", c->m_seqno,
 447                                c->m_waiting, c->get_hostname(),
 448                                c->m_cookie ? c->m_cookie : "");
 449             no_of_clients++;
 450             if (min_seq < 0 || c->m_seqno < min_seq)
 451             {
 452                 min_seq = c->m_seqno;
 453                 c_min = c;
 454             }
 455         }
 456         if (no_of_clients >= parent->m_max_clients)
 457         {
 458             c = c_min;
 459             if (c->m_waiting || strcmp(m_proxyTarget, c->get_hostname()))
 460             {
 461                 yaz_log (LOG_LOG, "%sMAXCLIENTS Destroy %d",
 462                          m_session_str, c->m_seqno);
 463                 if (c->m_server && c->m_server != this)
 464                     delete c->m_server;
 465                 c->m_server = 0;
 466             }
 467             else
 468             {
 469                 yaz_log (LOG_LOG, "%sMAXCLIENTS Reuse %d %d %s",
 470                          m_session_str,
 471                          c->m_seqno, parent->m_seqno, c->get_hostname());
 472                 xfree (c->m_cookie);
 473                 c->m_cookie = 0;
 474                 if (cookie)
 475                     c->m_cookie = xstrdup(cookie);
 476                 c->m_seqno = parent->m_seqno;
 477                 if (c->m_server && c->m_server != this)
 478                 {
 479                     c->m_server->m_client = 0;
 480                     delete c->m_server;
 481                 }
 482                 (parent->m_seqno)++;
 483                 c->m_target_idletime = m_target_idletime;
 484                 c->timeout(m_target_idletime);
 485
 486                 if (parent->m_log_mask & PROXY_LOG_APDU_SERVER)
 487                     c->set_APDU_yazlog(1);
 488                 else
 489                     c->set_APDU_yazlog(0);
 490
 491                 return c;
 492             }
 493         }
 494         else
 495         {
 496             yaz_log (LOG_LOG, "%sNEW %d %s",
 497                      m_session_str, parent->m_seqno, m_proxyTarget);
 498             c = new Yaz_ProxyClient(m_PDU_Observable->clone(), parent);
 499             c->m_next = parent->m_clientPool;
 500             if (c->m_next)
 501                 c->m_next->m_prev = &c->m_next;
 502             parent->m_clientPool = c;
 503             c->m_prev = &parent->m_clientPool;
 504         }
 505
 506         xfree (c->m_cookie);
 507         c->m_cookie = 0;
 508         if (cookie)
 509             c->m_cookie = xstrdup(cookie);
 510
 511         c->m_seqno = parent->m_seqno;
 512         c->m_init_flag = 0;
 513         c->m_last_resultCount = 0;
 514         c->m_last_ok = 0;
 515         c->m_cache.clear();
 516         c->m_sr_transform = 0;
 517         c->m_waiting = 0;
 518         c->m_resultSetStartPoint = 0;
 519         (parent->m_seqno)++;
 520         if (c->client(m_proxyTarget))
 521         {
 522             delete c;
 523             return 0;
 524         }
 525         c->m_target_idletime = m_target_idletime;
 526         c->timeout(30);
 527
 528         if (parent->m_log_mask & PROXY_LOG_APDU_SERVER)
 529             c->set_APDU_yazlog(1);
 530         else
 531             c->set_APDU_yazlog(0);
 532     }
 533     yaz_log (LOG_DEBUG, "get_client 3 %p %p", this, c);
 534     return c;
 535 }
 536
 537 void Yaz_Proxy::display_diagrecs(Z_DiagRec **pp, int num)
 538 {
 539     int i;
 540     for (i = 0; i<num; i++)
 541     {
 542         oident *ent;
 543         Z_DefaultDiagFormat *r;
 544         Z_DiagRec *p = pp[i];
 545         if (p->which != Z_DiagRec_defaultFormat)
 546         {
 547             yaz_log(LOG_LOG, "%sError no diagnostics", m_session_str);
 548             return;
 549         }
 550         else
 551             r = p->u.defaultFormat;
 552         if (!(ent = oid_getentbyoid(r->diagnosticSetId)) ||
 553             ent->oclass != CLASS_DIAGSET || ent->value != VAL_BIB1)
 554             yaz_log(LOG_LOG, "%sError unknown diagnostic set", m_session_str);
 555         switch (r->which)
 556         {
 557         case Z_DefaultDiagFormat_v2Addinfo:
 558             yaz_log(LOG_LOG, "%sError %d %s:%s",
 559                     m_session_str,
 560                     *r->condition, diagbib1_str(*r->condition),
 561                     r->u.v2Addinfo);
 562             break;
 563         case Z_DefaultDiagFormat_v3Addinfo:
 564             yaz_log(LOG_LOG, "%sError %d %s:%s",
 565                     m_session_str,
 566                     *r->condition, diagbib1_str(*r->condition),
 567                     r->u.v3Addinfo);
 568             break;
 569         }
 570     }
 571 }
 572
 573 void Yaz_Proxy::convert_to_marcxml(Z_NamePlusRecordList *p)
 574 {
 575     int i;
 576
 577     yaz_marc_t mt = yaz_marc_create();
 578     yaz_marc_xml(mt, YAZ_MARC_MARCXML);
 579     for (i = 0; i < p->num_records; i++)
 580     {
 581         Z_NamePlusRecord *npr = p->records[i];
 582         if (npr->which == Z_NamePlusRecord_databaseRecord)
 583         {
 584             Z_External *r = npr->u.databaseRecord;
 585             if (r->which == Z_External_octet)
 586             {
 587                 int rlen;
 588                 char *result;
 589                 if (yaz_marc_decode_buf(mt, (char*) r->u.octet_aligned->buf,
 590                                         r->u.octet_aligned->len,
 591                                         &result, &rlen))
 592                 {
 593                     yaz_iconv_t cd = yaz_iconv_open("UTF-8", "MARC-8");
 594                     WRBUF wrbuf = wrbuf_alloc();
 595
 596                     char outbuf[120];
 597                     size_t inbytesleft = rlen;
 598                     const char *inp = result;
 599                     while (cd && inbytesleft)
 600                     {
 601                         size_t outbytesleft = sizeof(outbuf);
 602                         char *outp = outbuf;
 603                         size_t r;
 604
 605                         r = yaz_iconv (cd, (char**) &inp,
 606                                        &inbytesleft,
 607                                        &outp, &outbytesleft);
 608                         if (r == (size_t) (-1))
 609                         {
 610                             int e = yaz_iconv_error(cd);
 611                             if (e != YAZ_ICONV_E2BIG)
 612                             {
 613                                 yaz_log(LOG_WARN, "conversion failure");
 614                                 break;
 615                             }
 616                         }
 617                         wrbuf_write(wrbuf, outbuf, outp - outbuf);
 618                     }
 619                     if (cd)
 620                         yaz_iconv_close(cd);
 621
 622                     npr->u.databaseRecord = z_ext_record(odr_encode(),
 623                                                          VAL_TEXT_XML,
 624                                                          wrbuf_buf(wrbuf),
 625                                                          wrbuf_len(wrbuf));
 626                     wrbuf_free(wrbuf, 1);
 627                 }
 628             }
 629         }
 630     }
 631     yaz_marc_destroy(mt);
 632 }
 633
 634 int Yaz_Proxy::send_http_response(int code)
 635 {
 636     ODR o = odr_encode();
 637     const char *ctype = "text/xml";
 638     Z_GDU *gdu = z_get_HTTP_Response(o, code);
 639     Z_HTTP_Response *hres = gdu->u.HTTP_Response;
 640     if (m_http_version)
 641         hres->version = odr_strdup(o, m_http_version);
 642     int len;
 643     int r = send_GDU(gdu, &len);
 644     delete this;
 645     return r;
 646 }
 647
 648 int Yaz_Proxy::send_srw_response(Z_SRW_PDU *srw_pdu)
 649 {
 650     ODR o = odr_encode();
 651     const char *ctype = "text/xml";
 652     Z_GDU *gdu = z_get_HTTP_Response(o, 200);
 653     Z_HTTP_Response *hres = gdu->u.HTTP_Response;
 654     if (m_http_version)
 655         hres->version = odr_strdup(o, m_http_version);
 656     z_HTTP_header_add(o, &hres->headers, "Content-Type", ctype);
 657     if (m_http_keepalive)
 658         z_HTTP_header_add(o, &hres->headers, "Connection", "Keep-Alive");
 659
 660     static Z_SOAP_Handler soap_handlers[2] = {
 661 #if HAVE_XML2
 662         {"http://www.loc.gov/zing/srw/v1.0/", 0,
 663          (Z_SOAP_fun) yaz_srw_codec},
 664 #endif
 665         {0, 0, 0}
 666     };
 667
 668     Z_SOAP *soap_package = (Z_SOAP*) odr_malloc(o, sizeof(Z_SOAP));
 669     soap_package->which = Z_SOAP_generic;
 670     soap_package->u.generic =
 671         (Z_SOAP_Generic *) odr_malloc(o,  sizeof(*soap_package->u.generic));
 672     soap_package->u.generic->no = 0;
 673     soap_package->u.generic->ns = soap_handlers[0].ns;
 674     soap_package->u.generic->p = (void *) srw_pdu;
 675     soap_package->ns = m_soap_ns;
 676     int ret = z_soap_codec_enc(o, &soap_package,
 677                                &hres->content_buf, &hres->content_len,
 678                                soap_handlers, 0);
 679     int len;
 680     int r = send_GDU(gdu, &len);
 681     if (!m_http_keepalive)
 682         delete this;
 683 }
 684
 685 int Yaz_Proxy::send_to_srw_client_error(int srw_error)
 686 {
 687     ODR o = odr_encode();
 688     Z_SRW_PDU *srw_pdu = yaz_srw_get(o, Z_SRW_searchRetrieve_response);
 689     Z_SRW_searchRetrieveResponse *srw_res = srw_pdu->u.response;
 690
 691     srw_res->num_diagnostics = 1;
 692     srw_res->diagnostics = (Z_SRW_diagnostic *)
 693         odr_malloc(o, sizeof(*srw_res->diagnostics));
 694     srw_res->diagnostics[0].code =  odr_intdup(o, srw_error);
 695     srw_res->diagnostics[0].details = 0;
 696     return send_srw_response(srw_pdu);
 697 }
 698
 699 int Yaz_Proxy::z_to_srw_diag(ODR o, Z_SRW_searchRetrieveResponse *srw_res,
 700                              Z_DefaultDiagFormat *ddf)
 701 {
 702     int bib1_code = *ddf->condition;
 703     if (bib1_code == 109)
 704         return 404;
 705     srw_res->num_diagnostics = 1;
 706     srw_res->diagnostics = (Z_SRW_diagnostic *)
 707         odr_malloc(o, sizeof(*srw_res->diagnostics));
 708     srw_res->diagnostics[0].code =
 709         odr_intdup(o, yaz_diag_bib1_to_srw(*ddf->condition));
 710     srw_res->diagnostics[0].details = ddf->u.v2Addinfo;
 711     return 0;
 712 }
 713
 714 int Yaz_Proxy::send_to_srw_client_ok(int hits, Z_Records *records)
 715 {
 716     ODR o = odr_encode();
 717     Z_SRW_PDU *srw_pdu = yaz_srw_get(o, Z_SRW_searchRetrieve_response);
 718     Z_SRW_searchRetrieveResponse *srw_res = srw_pdu->u.response;
 719
 720     srw_res->numberOfRecords = odr_intdup (o, hits);
 721     if (records && records->which == Z_Records_DBOSD)
 722     {
 723         srw_res->num_records =
 724             records->u.databaseOrSurDiagnostics->num_records;
 725         int i;
 726         srw_res->records = (Z_SRW_record *)
 727             odr_malloc(o, srw_res->num_records * sizeof(Z_SRW_record));
 728         for (i = 0; i < srw_res->num_records; i++)
 729         {
 730             Z_NamePlusRecord *npr = records->u.databaseOrSurDiagnostics->records[i];
 731             if (npr->which != Z_NamePlusRecord_databaseRecord)
 732             {
 733                 srw_res->records[i].recordSchema = "diagnostic";
 734                 srw_res->records[i].recordPacking = m_s2z_packing;
 735                 srw_res->records[i].recordData_buf = "67";
 736                 srw_res->records[i].recordData_len = 2;
 737                 srw_res->records[i].recordPosition = 0;
 738                 continue;
 739             }
 740             Z_External *r = npr->u.databaseRecord;
 741             oident *ent = oid_getentbyoid(r->direct_reference);
 742             if (r->which == Z_External_octet && ent->value == VAL_TEXT_XML)
 743             {
 744                 srw_res->records[i].recordSchema = "http://www.loc.gov/marcxml/";
 745                 srw_res->records[i].recordPacking = m_s2z_packing;
 746                 srw_res->records[i].recordData_buf = (char*)
 747                     r->u.octet_aligned->buf;
 748                 srw_res->records[i].recordData_len = r->u.octet_aligned->len;
 749                 srw_res->records[i].recordPosition = 0;
 750             }
 751             else
 752             {
 753                 srw_res->records[i].recordSchema = "diagnostic";
 754                 srw_res->records[i].recordPacking = m_s2z_packing;
 755                 srw_res->records[i].recordData_buf = "67";
 756                 srw_res->records[i].recordData_len = 2;
 757                 srw_res->records[i].recordPosition = 0;
 758             }
 759         }
 760     }
 761     if (records && records->which == Z_Records_NSD)
 762     {
 763         int http_code;
 764         http_code = z_to_srw_diag(odr_encode(), srw_res,
 765                                    records->u.nonSurrogateDiagnostic);
 766         if (http_code)
 767             return send_http_response(http_code);
 768     }
 769     return send_srw_response(srw_pdu);
 770
 771 }
 772 int Yaz_Proxy::send_PDU_convert(Z_APDU *apdu, int *len)
 773 {
 774     if (m_s2z_init_apdu && apdu->which == Z_APDU_initResponse)
 775     {
 776         m_s2z_init_apdu = 0;
 777         Z_InitResponse *res = apdu->u.initResponse;
 778         if (*res->result == 0)
 779         {
 780             send_to_srw_client_error(3);
 781         }
 782         else
 783         {
 784             handle_incoming_Z_PDU(m_s2z_search_apdu);
 785         }
 786     }
 787     else if (m_s2z_search_apdu && apdu->which == Z_APDU_searchResponse)
 788     {
 789         m_s2z_search_apdu = 0;
 790         Z_SearchResponse *res = apdu->u.searchResponse;
 791         m_s2z_hit_count = *res->resultCount;
 792         if (res->records && res->records->which == Z_Records_NSD)
 793         {
 794             send_to_srw_client_ok(0, res->records);
 795         }
 796         else if (m_s2z_present_apdu)
 797         {
 798             handle_incoming_Z_PDU(m_s2z_present_apdu);
 799         }
 800         else
 801         {
 802             send_to_srw_client_ok(m_s2z_hit_count, res->records);
 803         }
 804     }
 805     else if (m_s2z_present_apdu && apdu->which == Z_APDU_presentResponse)
 806     {
 807         m_s2z_present_apdu = 0;
 808         Z_PresentResponse *res = apdu->u.presentResponse;
 809         send_to_srw_client_ok(m_s2z_hit_count, res->records);
 810     }
 811     else
 812         return send_Z_PDU(apdu, len);
 813     return 0;
 814 }
 815
 816 int Yaz_Proxy::send_to_client(Z_APDU *apdu)
 817 {
 818     int len = 0;
 819     int kill_session = 0;
 820     if (apdu->which == Z_APDU_searchResponse)
 821     {
 822         Z_SearchResponse *sr = apdu->u.searchResponse;
 823         Z_Records *p = sr->records;
 824         if (p && p->which == Z_Records_NSD)
 825         {
 826             Z_DiagRec dr, *dr_p = &dr;
 827             dr.which = Z_DiagRec_defaultFormat;
 828             dr.u.defaultFormat = p->u.nonSurrogateDiagnostic;
 829
 830             *sr->searchStatus = 0;
 831             display_diagrecs(&dr_p, 1);
 832         }
 833         else
 834         {
 835             if (m_marcxml_flag && p && p->which == Z_Records_DBOSD)
 836                 convert_to_marcxml(p->u.databaseOrSurDiagnostics);
 837             if (sr->resultCount)
 838             {
 839                 yaz_log(LOG_LOG, "%s%d hits", m_session_str,
 840                         *sr->resultCount);
 841                 if (*sr->resultCount < 0)
 842                 {
 843                     m_invalid_session = 1;
 844                     kill_session = 1;
 845
 846                     *sr->searchStatus = 0;
 847                     sr->records =
 848                         create_nonSurrogateDiagnostics(odr_encode(), 2, 0);
 849                     *sr->resultCount = 0;
 850                 }
 851             }
 852         }
 853     }
 854     else if (apdu->which == Z_APDU_presentResponse)
 855     {
 856         Z_PresentResponse *sr = apdu->u.presentResponse;
 857         Z_Records *p = sr->records;
 858         if (p && p->which == Z_Records_NSD)
 859         {
 860             Z_DiagRec dr, *dr_p = &dr;
 861             dr.which = Z_DiagRec_defaultFormat;
 862             dr.u.defaultFormat = p->u.nonSurrogateDiagnostic;
 863             if (*sr->presentStatus == Z_PresentStatus_success)
 864                 *sr->presentStatus = Z_PresentStatus_failure;
 865             display_diagrecs(&dr_p, 1);
 866         }
 867         if (m_marcxml_flag && p && p->which == Z_Records_DBOSD)
 868             convert_to_marcxml(p->u.databaseOrSurDiagnostics);
 869     }
 870     int r = send_PDU_convert(apdu, &len);
 871     if (r)
 872         return r;
 873     if (m_log_mask & PROXY_LOG_APDU_CLIENT)
 874         yaz_log (LOG_DEBUG, "%sSending %s to client %d bytes", m_session_str,
 875                  apdu_name(apdu), len);
 876     m_bytes_sent += len;
 877     m_bw_stat.add_bytes(len);
 878     if (kill_session)
 879     {
 880         delete m_client;
 881         m_client = 0;
 882         m_parent->pre_init();
 883     }
 884     return r;
 885 }
 886
 887 int Yaz_ProxyClient::send_to_target(Z_APDU *apdu)
 888 {
 889     int len = 0;
 890     int r = send_Z_PDU(apdu, &len);
 891     if (m_root->get_log_mask() & PROXY_LOG_REQ_SERVER)
 892         yaz_log (LOG_LOG, "%sSending %s to %s %d bytes",
 893                  get_session_str(),
 894                  apdu_name(apdu), get_hostname(), len);
 895     m_bytes_sent += len;
 896     return r;
 897 }
 898
 899 Z_APDU *Yaz_Proxy::result_set_optimize(Z_APDU *apdu)
 900 {
 901     if (apdu->which == Z_APDU_presentRequest)
 902     {
 903         Z_PresentRequest *pr = apdu->u.presentRequest;
 904         int toget = *pr->numberOfRecordsRequested;
 905         int start = *pr->resultSetStartPoint;
 906
 907         yaz_log(LOG_LOG, "%sPresent %s %d+%d", m_session_str,
 908                 pr->resultSetId, start, toget);
 909
 910         if (*m_parent->m_optimize == '0')
 911             return apdu;
 912
 913         if (!m_client->m_last_resultSetId)
 914         {
 915             Z_APDU *new_apdu = create_Z_PDU(Z_APDU_presentResponse);
 916             new_apdu->u.presentResponse->records =
 917                 create_nonSurrogateDiagnostics(odr_encode(), 30,
 918                                                pr->resultSetId);
 919             send_to_client(new_apdu);
 920             return 0;
 921         }
 922         if (!strcmp(m_client->m_last_resultSetId, pr->resultSetId))
 923         {
 924             if (start+toget-1 > m_client->m_last_resultCount)
 925             {
 926                 Z_APDU *new_apdu = create_Z_PDU(Z_APDU_presentResponse);
 927                 new_apdu->u.presentResponse->records =
 928                     create_nonSurrogateDiagnostics(odr_encode(), 13, 0);
 929                 send_to_client(new_apdu);
 930                 return 0;
 931             }
 932             Z_NamePlusRecordList *npr;
 933             if (m_client->m_cache.lookup (odr_encode(), &npr, start, toget,
 934                                           pr->preferredRecordSyntax,
 935                                           pr->recordComposition))
 936             {
 937                 yaz_log (LOG_LOG, "%sReturned cached records for present request",
 938                          m_session_str);
 939                 Z_APDU *new_apdu = create_Z_PDU(Z_APDU_presentResponse);
 940                 new_apdu->u.presentResponse->referenceId = pr->referenceId;
 941
 942                 new_apdu->u.presentResponse->numberOfRecordsReturned
 943                     = odr_intdup(odr_encode(), toget);
 944
 945                 new_apdu->u.presentResponse->records = (Z_Records*)
 946                     odr_malloc(odr_encode(), sizeof(Z_Records));
 947                 new_apdu->u.presentResponse->records->which = Z_Records_DBOSD;
 948                 new_apdu->u.presentResponse->records->u.databaseOrSurDiagnostics = npr;
 949                 new_apdu->u.presentResponse->nextResultSetPosition =
 950                     odr_intdup(odr_encode(), start+toget);
 951
 952                 send_to_client(new_apdu);
 953                 return 0;
 954             }
 955         }
 956     }
 957
 958     if (apdu->which != Z_APDU_searchRequest)
 959         return apdu;
 960     Z_SearchRequest *sr = apdu->u.searchRequest;
 961     Yaz_Z_Query *this_query = new Yaz_Z_Query;
 962     Yaz_Z_Databases this_databases;
 963
 964     this_databases.set(sr->num_databaseNames, (const char **)
 965                        sr->databaseNames);
 966
 967     this_query->set_Z_Query(sr->query);
 968
 969     char query_str[120];
 970     this_query->print(query_str, sizeof(query_str)-1);
 971     yaz_log(LOG_LOG, "%sSearch %s", m_session_str, query_str);
 972
 973     if (*m_parent->m_optimize != '0' &&
 974         m_client->m_last_ok && m_client->m_last_query &&
 975         m_client->m_last_query->match(this_query) &&
 976         !strcmp(m_client->m_last_resultSetId, sr->resultSetName) &&
 977         m_client->m_last_databases.match(this_databases))
 978     {
 979         delete this_query;
 980         if (m_client->m_last_resultCount > *sr->smallSetUpperBound &&
 981             m_client->m_last_resultCount < *sr->largeSetLowerBound)
 982         {
 983             Z_NamePlusRecordList *npr;
 984             int toget = *sr->mediumSetPresentNumber;
 985             Z_RecordComposition *comp = 0;
 986
 987             if (toget > m_client->m_last_resultCount)
 988                 toget = m_client->m_last_resultCount;
 989
 990             if (sr->mediumSetElementSetNames)
 991             {
 992                 comp = (Z_RecordComposition *)
 993                     odr_malloc(odr_encode(), sizeof(Z_RecordComposition));
 994                 comp->which = Z_RecordComp_simple;
 995                 comp->u.simple = sr->mediumSetElementSetNames;
 996             }
 997
 998             if (m_client->m_cache.lookup (odr_encode(), &npr, 1, toget,
 999                                           sr->preferredRecordSyntax, comp))
1000             {
1001                 yaz_log (LOG_LOG, "%sReturned cached records for medium set",
1002                          m_session_str);
1003                 Z_APDU *new_apdu = create_Z_PDU(Z_APDU_searchResponse);
1004                 new_apdu->u.searchResponse->referenceId = sr->referenceId;
1005                 new_apdu->u.searchResponse->resultCount =
1006                     &m_client->m_last_resultCount;
1007
1008                 new_apdu->u.searchResponse->numberOfRecordsReturned
1009                     = odr_intdup(odr_encode(), toget);
1010
1011                 new_apdu->u.searchResponse->presentStatus =
1012                     odr_intdup(odr_encode(), Z_PresentStatus_success);
1013                 new_apdu->u.searchResponse->records = (Z_Records*)
1014                     odr_malloc(odr_encode(), sizeof(Z_Records));
1015                 new_apdu->u.searchResponse->records->which = Z_Records_DBOSD;
1016                 new_apdu->u.searchResponse->records->u.databaseOrSurDiagnostics = npr;
1017                 new_apdu->u.searchResponse->nextResultSetPosition =
1018                     odr_intdup(odr_encode(), toget+1);
1019                 send_to_client(new_apdu);
1020                 return 0;
1021             }
1022             else
1023             {
1024                 // medium Set
1025                 // send present request (medium size)
1026                 yaz_log (LOG_LOG, "%sOptimizing search for medium set",
1027                          m_session_str);
1028
1029                 Z_APDU *new_apdu = create_Z_PDU(Z_APDU_presentRequest);
1030                 Z_PresentRequest *pr = new_apdu->u.presentRequest;
1031                 pr->referenceId = sr->referenceId;
1032                 pr->resultSetId = sr->resultSetName;
1033                 pr->preferredRecordSyntax = sr->preferredRecordSyntax;
1034                 *pr->numberOfRecordsRequested = toget;
1035                 pr->recordComposition = comp;
1036                 m_client->m_sr_transform = 1;
1037                 return new_apdu;
1038             }
1039         }
1040         else if (m_client->m_last_resultCount >= *sr->largeSetLowerBound ||
1041             m_client->m_last_resultCount <= 0)
1042         {
1043             // large set. Return pseudo-search response immediately
1044             yaz_log (LOG_LOG, "%sOptimizing search for large set",
1045                      m_session_str);
1046             Z_APDU *new_apdu = create_Z_PDU(Z_APDU_searchResponse);
1047             new_apdu->u.searchResponse->referenceId = sr->referenceId;
1048             new_apdu->u.searchResponse->resultCount =
1049                 &m_client->m_last_resultCount;
1050             send_to_client(new_apdu);
1051             return 0;
1052         }
1053         else
1054         {
1055             Z_NamePlusRecordList *npr;
1056             int toget = m_client->m_last_resultCount;
1057             Z_RecordComposition *comp = 0;
1058             // small set
1059             // send a present request (small set)
1060
1061             if (sr->smallSetElementSetNames)
1062             {
1063                 comp = (Z_RecordComposition *)
1064                     odr_malloc(odr_encode(), sizeof(Z_RecordComposition));
1065                 comp->which = Z_RecordComp_simple;
1066                 comp->u.simple = sr->smallSetElementSetNames;
1067             }
1068
1069             if (m_client->m_cache.lookup (odr_encode(), &npr, 1, toget,
1070                                           sr->preferredRecordSyntax, comp))
1071             {
1072                 yaz_log (LOG_LOG, "%sReturned cached records for small set",
1073                          m_session_str);
1074                 Z_APDU *new_apdu = create_Z_PDU(Z_APDU_searchResponse);
1075                 new_apdu->u.searchResponse->referenceId = sr->referenceId;
1076                 new_apdu->u.searchResponse->resultCount =
1077                     &m_client->m_last_resultCount;
1078
1079                 new_apdu->u.searchResponse->numberOfRecordsReturned
1080                     = odr_intdup(odr_encode(), toget);
1081
1082                 new_apdu->u.searchResponse->presentStatus =
1083                     odr_intdup(odr_encode(), Z_PresentStatus_success);
1084                 new_apdu->u.searchResponse->records = (Z_Records*)
1085                     odr_malloc(odr_encode(), sizeof(Z_Records));
1086                 new_apdu->u.searchResponse->records->which = Z_Records_DBOSD;
1087                 new_apdu->u.searchResponse->records->u.databaseOrSurDiagnostics = npr;
1088                 new_apdu->u.searchResponse->nextResultSetPosition =
1089                     odr_intdup(odr_encode(), toget+1);
1090                 send_to_client(new_apdu);
1091                 return 0;
1092             }
1093             else
1094             {
1095                 yaz_log (LOG_LOG, "%sOptimizing search for small set",
1096                          m_session_str);
1097                 Z_APDU *new_apdu = create_Z_PDU(Z_APDU_presentRequest);
1098                 Z_PresentRequest *pr = new_apdu->u.presentRequest;
1099                 pr->referenceId = sr->referenceId;
1100                 pr->resultSetId = sr->resultSetName;
1101                 pr->preferredRecordSyntax = sr->preferredRecordSyntax;
1102                 *pr->numberOfRecordsRequested = toget;
1103                 pr->recordComposition = comp;
1104                 m_client->m_sr_transform = 1;
1105                 return new_apdu;
1106             }
1107         }
1108     }
1109     else  // query doesn't match
1110     {
1111         delete m_client->m_last_query;
1112         m_client->m_last_query = this_query;
1113         m_client->m_last_ok = 0;
1114         m_client->m_cache.clear();
1115         m_client->m_resultSetStartPoint = 0;
1116
1117         xfree (m_client->m_last_resultSetId);
1118         m_client->m_last_resultSetId = xstrdup (sr->resultSetName);
1119
1120         m_client->m_last_databases.set(sr->num_databaseNames,
1121                                        (const char **) sr->databaseNames);
1122     }
1123     return apdu;
1124 }
1125
1126
1127 void Yaz_Proxy::recv_GDU(Z_GDU *apdu, int len)
1128 {
1129     char *cp = strchr(m_session_str, ' ');
1130     m_request_no++;
1131     if (cp)
1132         sprintf(cp+1, "%d ", m_request_no);
1133
1134     m_bytes_recv += len;
1135
1136     if (m_log_mask & PROXY_LOG_APDU_CLIENT)
1137         yaz_log (LOG_DEBUG, "%sReceiving %s from client %d bytes",
1138                  m_session_str, gdu_name(apdu), len);
1139
1140     if (m_bw_hold_PDU)     // double incoming PDU. shutdown now.
1141         shutdown();
1142
1143     m_bw_stat.add_bytes(len);
1144     m_pdu_stat.add_bytes(1);
1145
1146     int bw_total = m_bw_stat.get_total();
1147     int pdu_total = m_pdu_stat.get_total();
1148
1149     yaz_log(LOG_LOG, "%sstat bw=%d pdu=%d limit-bw=%d limit-pdu=%d",
1150             m_session_str, bw_total, pdu_total, m_bw_max, m_pdu_max);
1151     int reduce = 0;
1152     if (m_bw_max)
1153     {
1154         if (bw_total > m_bw_max)
1155         {
1156             reduce = (bw_total/m_bw_max);
1157         }
1158     }
1159     if (m_pdu_max)
1160     {
1161         if (pdu_total > m_pdu_max)
1162         {
1163             int nreduce = (m_pdu_max >= 60) ? 1 : 60/m_pdu_max;
1164             reduce = (reduce > nreduce) ? reduce : nreduce;
1165         }
1166     }
1167     if (reduce)
1168     {
1169         yaz_log(LOG_LOG, "%sLimit delay=%d", m_session_str, reduce);
1170         m_bw_hold_PDU = apdu;  // save PDU and signal "on hold"
1171         timeout(reduce);       // call us reduce seconds later
1172     }
1173     else if (apdu->which == Z_GDU_Z3950)
1174         handle_incoming_Z_PDU(apdu->u.z3950);
1175     else if (apdu->which == Z_GDU_HTTP_Request)
1176         handle_incoming_HTTP(apdu->u.HTTP_Request);
1177 }
1178
1179 void Yaz_Proxy::handle_max_record_retrieve(Z_APDU *apdu)
1180 {
1181     if (m_max_record_retrieve)
1182     {
1183         if (apdu->which == Z_APDU_presentRequest)
1184         {
1185             Z_PresentRequest *pr = apdu->u.presentRequest;
1186             if (pr->numberOfRecordsRequested &&
1187                 *pr->numberOfRecordsRequested > m_max_record_retrieve)
1188                 *pr->numberOfRecordsRequested = m_max_record_retrieve;
1189         }
1190     }
1191 }
1192
1193 Z_Records *Yaz_Proxy::create_nonSurrogateDiagnostics(ODR odr,
1194                                                      int error,
1195                                                      const char *addinfo)
1196 {
1197     Z_Records *rec = (Z_Records *)
1198         odr_malloc (odr, sizeof(*rec));
1199     int *err = (int *)
1200         odr_malloc (odr, sizeof(*err));
1201     Z_DiagRec *drec = (Z_DiagRec *)
1202         odr_malloc (odr, sizeof(*drec));
1203     Z_DefaultDiagFormat *dr = (Z_DefaultDiagFormat *)
1204         odr_malloc (odr, sizeof(*dr));
1205     *err = error;
1206     rec->which = Z_Records_NSD;
1207     rec->u.nonSurrogateDiagnostic = dr;
1208     dr->diagnosticSetId =
1209         yaz_oidval_to_z3950oid (odr, CLASS_DIAGSET, VAL_BIB1);
1210     dr->condition = err;
1211     dr->which = Z_DefaultDiagFormat_v2Addinfo;
1212     dr->u.v2Addinfo = odr_strdup (odr, addinfo ? addinfo : "");
1213     return rec;
1214 }
1215
1216 Z_APDU *Yaz_Proxy::handle_query_transformation(Z_APDU *apdu)
1217 {
1218     if (apdu->which == Z_APDU_searchRequest &&
1219         apdu->u.searchRequest->query &&
1220         apdu->u.searchRequest->query->which == Z_Query_type_104 &&
1221         apdu->u.searchRequest->query->u.type_104->which == Z_External_CQL)
1222     {
1223         Z_RPNQuery *rpnquery = 0;
1224         Z_SearchRequest *sr = apdu->u.searchRequest;
1225
1226         yaz_log(LOG_LOG, "%sCQL: %s", m_session_str,
1227                 sr->query->u.type_104->u.cql);
1228
1229         int r = m_cql2rpn.query_transform(sr->query->u.type_104->u.cql,
1230                                           &rpnquery, odr_encode());
1231         if (r == -3)
1232             yaz_log(LOG_LOG, "%sNo CQL to RPN table", m_session_str);
1233         else if (r)
1234             yaz_log(LOG_LOG, "%sCQL Conversion error %d", m_session_str, r);
1235         else
1236         {
1237             sr->query->which = Z_Query_type_1;
1238             sr->query->u.type_1 = rpnquery;
1239         }
1240         return apdu;
1241     }
1242     return apdu;
1243 }
1244
1245 Z_APDU *Yaz_Proxy::handle_query_validation(Z_APDU *apdu)
1246 {
1247     if (apdu->which == Z_APDU_searchRequest)
1248     {
1249         Z_SearchRequest *sr = apdu->u.searchRequest;
1250         int err = 0;
1251         char *addinfo = 0;
1252
1253         Yaz_ProxyConfig *cfg = check_reconfigure();
1254         if (cfg)
1255             err = cfg->check_query(odr_encode(), m_default_target,
1256                                    sr->query, &addinfo);
1257         if (err)
1258         {
1259             Z_APDU *new_apdu = create_Z_PDU(Z_APDU_searchResponse);
1260
1261             new_apdu->u.searchResponse->referenceId = sr->referenceId;
1262             new_apdu->u.searchResponse->records =
1263                 create_nonSurrogateDiagnostics(odr_encode(), err, addinfo);
1264             *new_apdu->u.searchResponse->searchStatus = 0;
1265
1266             send_to_client(new_apdu);
1267
1268             return 0;
1269         }
1270     }
1271     return apdu;
1272 }
1273
1274 Z_APDU *Yaz_Proxy::handle_syntax_validation(Z_APDU *apdu)
1275 {
1276     m_marcxml_flag = 0;
1277     if (apdu->which == Z_APDU_searchRequest)
1278     {
1279         Z_SearchRequest *sr = apdu->u.searchRequest;
1280         int err = 0;
1281         char *addinfo = 0;
1282         Yaz_ProxyConfig *cfg = check_reconfigure();
1283
1284         if (cfg)
1285             err = cfg->check_syntax(odr_encode(),
1286                                     m_default_target,
1287                                     sr->preferredRecordSyntax,
1288                                     &addinfo);
1289         if (err == -1)
1290         {
1291             sr->preferredRecordSyntax =
1292                 yaz_oidval_to_z3950oid(odr_decode(), CLASS_RECSYN,
1293                                        VAL_USMARC);
1294             m_marcxml_flag = 1;
1295         }
1296         else if (err)
1297         {
1298             Z_APDU *new_apdu = create_Z_PDU(Z_APDU_searchResponse);
1299
1300             new_apdu->u.searchResponse->referenceId = sr->referenceId;
1301             new_apdu->u.searchResponse->records =
1302                 create_nonSurrogateDiagnostics(odr_encode(), err, addinfo);
1303             *new_apdu->u.searchResponse->searchStatus = 0;
1304
1305             send_to_client(new_apdu);
1306
1307             return 0;
1308         }
1309     }
1310     else if (apdu->which == Z_APDU_presentRequest)
1311     {
1312         Z_PresentRequest *pr = apdu->u.presentRequest;
1313         int err = 0;
1314         char *addinfo = 0;
1315         Yaz_ProxyConfig *cfg = check_reconfigure();
1316
1317         if (cfg)
1318             err = cfg->check_syntax(odr_encode(), m_default_target,
1319                                     pr->preferredRecordSyntax,
1320                                     &addinfo);
1321         if (err == -1)
1322         {
1323             pr->preferredRecordSyntax =
1324                 yaz_oidval_to_z3950oid(odr_decode(), CLASS_RECSYN,
1325                                        VAL_USMARC);
1326             m_marcxml_flag = 1;
1327         }
1328         else if (err)
1329         {
1330             Z_APDU *new_apdu = create_Z_PDU(Z_APDU_presentResponse);
1331
1332             new_apdu->u.presentResponse->referenceId = pr->referenceId;
1333             new_apdu->u.presentResponse->records =
1334                 create_nonSurrogateDiagnostics(odr_encode(), err, addinfo);
1335             *new_apdu->u.presentResponse->presentStatus =
1336                 Z_PresentStatus_failure;
1337
1338             send_to_client(new_apdu);
1339
1340             return 0;
1341         }
1342     }
1343     return apdu;
1344 }
1345
1346 static int hex_digit (int ch)
1347 {
1348     if (ch >= '0' && ch <= '9')
1349         return ch - '0';
1350     else if (ch >= 'a' && ch <= 'f')
1351         return ch - 'a'+10;
1352     else if (ch >= 'A' && ch <= 'F')
1353         return ch - 'A'+10;
1354     return 0;
1355 }
1356
1357 static char *uri_val(const char *path, const char *name, ODR o)
1358 {
1359     size_t nlen = strlen(name);
1360     if (*path != '?')
1361         return 0;
1362     path++;
1363     while (path && *path)
1364     {
1365         const char *p1 = strchr(path, '=');
1366         if (!p1)
1367             break;
1368         if ((size_t)(p1 - path) == nlen && !memcmp(path, name, nlen))
1369         {
1370             size_t i = 0;
1371             char *ret;
1372
1373             path = p1 + 1;
1374             p1 = strchr(path, '&');
1375             if (!p1)
1376                 p1 = strlen(path) + path;
1377             ret = (char*) odr_malloc(o, p1 - path + 1);
1378             while (*path && *path != '&')
1379             {
1380                 if (*path == '+')
1381                 {
1382                     ret[i++] = ' ';
1383                     path++;
1384                 }
1385                 else if (*path == '%' && path[1] && path[2])
1386                 {
1387                     ret[i++] = hex_digit (path[1])*16 + hex_digit (path[2]);
1388                     path = path + 3;
1389                 }
1390                 else
1391                     ret[i++] = *path++;
1392             }
1393             ret[i] = '\0';
1394             return ret;
1395         }
1396         path = strchr(p1, '&');
1397         if (path)
1398             path++;
1399     }
1400     return 0;
1401 }
1402
1403 void uri_val_int(const char *path, const char *name, ODR o, int **intp)
1404 {
1405     const char *v = uri_val(path, name, o);
1406     if (v)
1407         *intp = odr_intdup(o, atoi(v));
1408 }
1409
1410 int yaz_check_for_sru(Z_HTTP_Request *hreq, Z_SRW_PDU **srw_pdu,
1411                       char **soap_ns, ODR decode)
1412 {
1413     if (!strcmp(hreq->method, "GET"))
1414     {
1415         char *db = "Default";
1416         const char *p0 = hreq->path, *p1;
1417 #if HAVE_XML2
1418         int ret = -1;
1419         char *charset = 0;
1420         Z_SOAP *soap_package = 0;
1421         static Z_SOAP_Handler soap_handlers[2] = {
1422             {"http://www.loc.gov/zing/srw/v1.0/", 0,
1423              (Z_SOAP_fun) yaz_srw_codec},
1424             {0, 0, 0}
1425         };
1426 #endif
1427
1428         if (*p0 == '/')
1429             p0++;
1430         p1 = strchr(p0, '?');
1431         if (!p1)
1432             p1 = p0 + strlen(p0);
1433         if (p1 != p0)
1434         {
1435             db = (char*) odr_malloc(decode, p1 - p0 + 1);
1436             memcpy (db, p0, p1 - p0);
1437             db[p1 - p0] = '\0';
1438         }
1439 #if HAVE_XML2
1440         if (p1 && *p1 == '?' && p1[1])
1441         {
1442             Z_SRW_PDU *sr = yaz_srw_get(decode, Z_SRW_searchRetrieve_request);
1443             char *query = uri_val(p1, "query", decode);
1444             char *pQuery = uri_val(p1, "pQuery", decode);
1445             char *sortKeys = uri_val(p1, "sortKeys", decode);
1446
1447             *srw_pdu = sr;
1448             if (query)
1449             {
1450                 sr->u.request->query_type = Z_SRW_query_type_cql;
1451                 sr->u.request->query.cql = query;
1452             }
1453             if (pQuery)
1454             {
1455                 sr->u.request->query_type = Z_SRW_query_type_pqf;
1456                 sr->u.request->query.pqf = pQuery;
1457             }
1458             if (sortKeys)
1459             {
1460                 sr->u.request->sort_type = Z_SRW_sort_type_sort;
1461                 sr->u.request->sort.sortKeys = sortKeys;
1462             }
1463             sr->u.request->recordSchema = uri_val(p1, "recordSchema", decode);
1464             sr->u.request->recordPacking = uri_val(p1, "recordPacking", decode);
1465             if (!sr->u.request->recordPacking)
1466                 sr->u.request->recordPacking = "xml";
1467             uri_val_int(p1, "maximumRecords", decode,
1468                         &sr->u.request->maximumRecords);
1469             uri_val_int(p1, "startRecord", decode,
1470                         &sr->u.request->startRecord);
1471             if (sr->u.request->startRecord)
1472                 yaz_log(LOG_LOG, "startRecord=%d", *sr->u.request->startRecord);
1473             sr->u.request->database = db;
1474             *soap_ns = "SRU";
1475             return 0;
1476         }
1477 #endif
1478         return 1;
1479     }
1480     return 2;
1481 }
1482
1483 int yaz_check_for_srw(Z_HTTP_Request *hreq, Z_SRW_PDU **srw_pdu,
1484                       char **soap_ns, ODR decode)
1485 {
1486     if (!strcmp(hreq->method, "POST"))
1487     {
1488         const char *content_type = z_HTTP_header_lookup(hreq->headers,
1489                                                         "Content-Type");
1490         if (content_type && !yaz_strcmp_del("text/xml", content_type, "; "))
1491         {
1492             char *db = "Default";
1493             const char *p0 = hreq->path, *p1;
1494             Z_SOAP *soap_package = 0;
1495             int ret = -1;
1496             int http_code = 500;
1497             const char *charset_p = 0;
1498             char *charset = 0;
1499
1500             static Z_SOAP_Handler soap_handlers[2] = {
1501 #if HAVE_XML2
1502                 {"http://www.loc.gov/zing/srw/v1.0/", 0,
1503                  (Z_SOAP_fun) yaz_srw_codec},
1504 #endif
1505                 {0, 0, 0}
1506             };
1507
1508             if (*p0 == '/')
1509                 p0++;
1510             p1 = strchr(p0, '?');
1511             if (!p1)
1512                 p1 = p0 + strlen(p0);
1513             if (p1 != p0)
1514             {
1515                 db = (char*) odr_malloc(decode, p1 - p0 + 1);
1516                 memcpy (db, p0, p1 - p0);
1517                 db[p1 - p0] = '\0';
1518             }
1519
1520             if ((charset_p = strstr(content_type, "; charset=")))
1521             {
1522                 int i = 0;
1523                 charset_p += 10;
1524                 while (i < 20 && charset_p[i] &&
1525                        !strchr("; \n\r", charset_p[i]))
1526                     i++;
1527                 charset = (char*) odr_malloc(decode, i+1);
1528                 memcpy(charset, charset_p, i);
1529                 charset[i] = '\0';
1530                 yaz_log(LOG_LOG, "SOAP encoding %s", charset);
1531             }
1532             ret = z_soap_codec(decode, &soap_package,
1533                                &hreq->content_buf, &hreq->content_len,
1534                                soap_handlers);
1535             if (!ret && soap_package->which == Z_SOAP_generic &&
1536                 soap_package->u.generic->no == 0)
1537             {
1538                 *srw_pdu = (Z_SRW_PDU*) soap_package->u.generic->p;
1539
1540                 if ((*srw_pdu)->which == Z_SRW_searchRetrieve_request &&
1541                     (*srw_pdu)->u.request->database == 0)
1542                     (*srw_pdu)->u.request->database = db;
1543
1544                 *soap_ns = odr_strdup(decode, soap_package->ns);
1545                 return 0;
1546             }
1547             return 1;
1548         }
1549     }
1550     return 2;
1551 }
1552
1553 void Yaz_Proxy::handle_incoming_HTTP(Z_HTTP_Request *hreq)
1554 {
1555     Z_SRW_PDU *srw_pdu = 0;
1556     char *soap_ns = 0;
1557     if (m_s2z_odr)
1558     {
1559         odr_destroy(m_s2z_odr);
1560         m_s2z_odr = 0;
1561     }
1562
1563     m_http_keepalive = 0;
1564     m_http_version = 0;
1565     if (!strcmp(hreq->version, "1.0"))
1566     {
1567         const char *v = z_HTTP_header_lookup(hreq->headers, "Connection");
1568         if (v && !strcmp(v, "Keep-Alive"))
1569             m_http_keepalive = 1;
1570         else
1571             m_http_keepalive = 0;
1572         m_http_version = "1.0";
1573     }
1574     else
1575     {
1576         const char *v = z_HTTP_header_lookup(hreq->headers, "Connection");
1577         if (v && !strcmp(v, "close"))
1578             m_http_keepalive = 0;
1579         else
1580             m_http_keepalive = 1;
1581         m_http_version = "1.1";
1582     }
1583
1584     if (yaz_check_for_srw(hreq, &srw_pdu, &soap_ns, odr_decode()) == 0
1585         || yaz_check_for_sru(hreq, &srw_pdu, &soap_ns, odr_decode()) == 0)
1586     {
1587         m_s2z_odr = odr_createmem(ODR_ENCODE);
1588         m_soap_ns = odr_strdup(m_s2z_odr, soap_ns);
1589         m_s2z_init_apdu = 0;
1590         m_s2z_search_apdu = 0;
1591         m_s2z_present_apdu = 0;
1592         if (srw_pdu->which == Z_SRW_searchRetrieve_request)
1593         {
1594             Z_SRW_searchRetrieveRequest *srw_req = srw_pdu->u.request;
1595
1596             // set packing for response records ..
1597             if (srw_req->recordPacking &&
1598                 !strcmp(srw_req->recordPacking, "xml"))
1599                 m_s2z_packing = Z_SRW_recordPacking_XML;
1600             else
1601                 m_s2z_packing = Z_SRW_recordPacking_string;
1602
1603             // prepare search PDU
1604             m_s2z_search_apdu = zget_APDU(m_s2z_odr, Z_APDU_searchRequest);
1605             Z_SearchRequest *z_searchRequest =
1606                 m_s2z_search_apdu->u.searchRequest;
1607
1608             z_searchRequest->num_databaseNames = 1;
1609             z_searchRequest->databaseNames = (char**)
1610                 odr_malloc(m_s2z_odr, sizeof(char *));
1611             z_searchRequest->databaseNames[0] = odr_strdup(m_s2z_odr,
1612                                                            srw_req->database);
1613
1614             // query transformation
1615             Z_Query *query = (Z_Query *)
1616                 odr_malloc(odr_encode(), sizeof(Z_Query));
1617             z_searchRequest->query = query;
1618
1619             if (srw_req->query_type == Z_SRW_query_type_cql)
1620             {
1621                 Z_External *ext = (Z_External *)
1622                     odr_malloc(m_s2z_odr, sizeof(*ext));
1623                 ext->direct_reference =
1624                     odr_getoidbystr(m_s2z_odr, "1.2.840.10003.16.2");
1625                 ext->indirect_reference = 0;
1626                 ext->descriptor = 0;
1627                 ext->which = Z_External_CQL;
1628                 ext->u.cql = srw_req->query.cql;
1629
1630                 query->which = Z_Query_type_104;
1631                 query->u.type_104 =  ext;
1632             }
1633             else if (srw_req->query_type == Z_SRW_query_type_pqf)
1634             {
1635                 Z_RPNQuery *RPNquery;
1636                 YAZ_PQF_Parser pqf_parser;
1637
1638                 pqf_parser = yaz_pqf_create ();
1639
1640                 RPNquery = yaz_pqf_parse (pqf_parser, m_s2z_odr,
1641                                           srw_req->query.pqf);
1642                 if (!RPNquery)
1643                 {
1644                     const char *pqf_msg;
1645                     size_t off;
1646                     int code = yaz_pqf_error (pqf_parser, &pqf_msg, &off);
1647                     yaz_log(LOG_LOG, "%*s^\n", off+4, "");
1648                     yaz_log(LOG_LOG, "Bad PQF: %s (code %d)\n", pqf_msg, code);
1649
1650                     send_to_srw_client_error(10);
1651                     return;
1652                 }
1653                 query->which = Z_Query_type_1;
1654                 query->u.type_1 =  RPNquery;
1655
1656                 yaz_pqf_destroy (pqf_parser);
1657             }
1658             else
1659             {
1660                 send_to_srw_client_error(11);
1661                 return;
1662             }
1663
1664             // present
1665             m_s2z_present_apdu = 0;
1666             int max = 0;
1667             if (srw_req->maximumRecords)
1668                 max = *srw_req->maximumRecords;
1669             int start = 1;
1670             if (srw_req->startRecord)
1671                 start = *srw_req->startRecord;
1672             if (max > 0)
1673             {
1674                 if (start <= 1)  // Z39.50 piggyback
1675                 {
1676                     *z_searchRequest->smallSetUpperBound = max;
1677                     *z_searchRequest->mediumSetPresentNumber = max;
1678                     *z_searchRequest->largeSetLowerBound = 2000000000; // 2e9
1679                     z_searchRequest->preferredRecordSyntax =
1680                         yaz_oidval_to_z3950oid(m_s2z_odr, CLASS_RECSYN,
1681                                                VAL_TEXT_XML);
1682                 }
1683                 else   // Z39.50 present
1684                 {
1685                     m_s2z_present_apdu = zget_APDU(m_s2z_odr,
1686                                                    Z_APDU_presentRequest);
1687                     Z_PresentRequest *z_presentRequest =
1688                         m_s2z_present_apdu->u.presentRequest;
1689                     *z_presentRequest->resultSetStartPoint = start;
1690                     *z_presentRequest->numberOfRecordsRequested = max;
1691                     z_presentRequest->preferredRecordSyntax =
1692                         yaz_oidval_to_z3950oid(m_s2z_odr, CLASS_RECSYN,
1693                                                VAL_TEXT_XML);
1694                 }
1695             }
1696             if (!m_client)
1697             {
1698                 m_s2z_init_apdu = zget_APDU(m_s2z_odr, Z_APDU_initRequest);
1699                 handle_incoming_Z_PDU(m_s2z_init_apdu);
1700                 return;
1701             }
1702             else
1703             {
1704                 handle_incoming_Z_PDU(m_s2z_search_apdu);
1705                 return;
1706             }
1707         }
1708     }
1709     int len = 0;
1710     Z_GDU *p = z_get_HTTP_Response(odr_encode(), 400);
1711     send_GDU(p, &len);
1712     timeout(1);
1713 }
1714
1715 void Yaz_Proxy::handle_incoming_Z_PDU(Z_APDU *apdu)
1716 {
1717     if (!m_client && m_invalid_session)
1718     {
1719         m_apdu_invalid_session = apdu;
1720         m_mem_invalid_session = odr_extract_mem(odr_decode());
1721         apdu = m_initRequest_apdu;
1722     }
1723
1724     // Determine our client.
1725     Z_OtherInformation **oi;
1726     get_otherInfoAPDU(apdu, &oi);
1727     m_client = get_client(apdu, get_cookie(oi), get_proxy(oi));
1728     if (!m_client)
1729     {
1730         delete this;
1731         return;
1732     }
1733     m_client->m_server = this;
1734
1735     if (apdu->which == Z_APDU_initRequest)
1736     {
1737         if (apdu->u.initRequest->implementationId)
1738             yaz_log(LOG_LOG, "%simplementationId: %s",
1739                     m_session_str, apdu->u.initRequest->implementationId);
1740         if (apdu->u.initRequest->implementationName)
1741             yaz_log(LOG_LOG, "%simplementationName: %s",
1742                     m_session_str, apdu->u.initRequest->implementationName);
1743         if (apdu->u.initRequest->implementationVersion)
1744             yaz_log(LOG_LOG, "%simplementationVersion: %s",
1745                     m_session_str, apdu->u.initRequest->implementationVersion);
1746         if (m_initRequest_apdu == 0)
1747         {
1748             if (m_initRequest_mem)
1749                 nmem_destroy(m_initRequest_mem);
1750             m_initRequest_apdu = apdu;
1751             m_initRequest_mem = odr_extract_mem(odr_decode());
1752         }
1753         if (m_client->m_init_flag)
1754         {
1755             if (handle_init_response_for_invalid_session(apdu))
1756                 return;
1757             Z_APDU *apdu = m_client->m_initResponse;
1758             apdu->u.initResponse->otherInfo = 0;
1759             if (m_client->m_cookie && *m_client->m_cookie)
1760                 set_otherInformationString(apdu, VAL_COOKIE, 1,
1761                                            m_client->m_cookie);
1762             send_to_client(apdu);
1763             return;
1764         }
1765         m_client->m_init_flag = 1;
1766     }
1767     handle_max_record_retrieve(apdu);
1768
1769     if (apdu)
1770         apdu = handle_syntax_validation(apdu);
1771
1772     if (apdu)
1773         apdu = handle_query_transformation(apdu);
1774
1775     if (apdu)
1776         apdu = handle_query_validation(apdu);
1777
1778     if (apdu)
1779         apdu = result_set_optimize(apdu);
1780     if (!apdu)
1781     {
1782         m_client->timeout(m_target_idletime);  // mark it active even
1783         // though we didn't use it
1784         return;
1785     }
1786
1787     // delete other info part from PDU before sending to target
1788     get_otherInfoAPDU(apdu, &oi);
1789     if (oi)
1790         *oi = 0;
1791
1792     if (apdu->which == Z_APDU_presentRequest &&
1793         m_client->m_resultSetStartPoint == 0)
1794     {
1795         Z_PresentRequest *pr = apdu->u.presentRequest;
1796         m_client->m_resultSetStartPoint = *pr->resultSetStartPoint;
1797         m_client->m_cache.copy_presentRequest(apdu->u.presentRequest);
1798     } else {
1799         m_client->m_resultSetStartPoint = 0;
1800     }
1801     if (m_client->send_to_target(apdu) < 0)
1802     {
1803         delete m_client;
1804         m_client = 0;
1805         delete this;
1806     }
1807     else
1808         m_client->m_waiting = 1;
1809 }
1810
1811 void Yaz_Proxy::connectNotify()
1812 {
1813 }
1814
1815 void Yaz_Proxy::shutdown()
1816 {
1817     m_invalid_session = 0;
1818     // only keep if keep_alive flag is set...
1819     if (m_client &&
1820         m_client->m_pdu_recv < m_keepalive_limit_pdu &&
1821         m_client->m_bytes_recv+m_client->m_bytes_sent < m_keepalive_limit_bw &&
1822         m_client->m_waiting == 0)
1823     {
1824         yaz_log(LOG_LOG, "%sShutdown (client to proxy) keepalive %s",
1825                  m_session_str,
1826                  m_client->get_hostname());
1827         yaz_log(LOG_LOG, "%sbw=%d pdu=%d limit-bw=%d limit-pdu=%d",
1828                 m_session_str, m_client->m_pdu_recv,
1829                 m_client->m_bytes_sent + m_client->m_bytes_recv,
1830                 m_keepalive_limit_bw, m_keepalive_limit_pdu);
1831         assert (m_client->m_waiting != 2);
1832         // Tell client (if any) that no server connection is there..
1833         m_client->m_server = 0;
1834         m_invalid_session = 0;
1835     }
1836     else if (m_client)
1837     {
1838         yaz_log (LOG_LOG, "%sShutdown (client to proxy) close %s",
1839                  m_session_str,
1840                  m_client->get_hostname());
1841         assert (m_client->m_waiting != 2);
1842         delete m_client;
1843     }
1844     else if (!m_parent)
1845     {
1846         yaz_log (LOG_LOG, "%sshutdown (client to proxy) bad state",
1847                  m_session_str);
1848         assert (m_parent);
1849     }
1850     else
1851     {
1852         yaz_log (LOG_LOG, "%sShutdown (client to proxy)",
1853                  m_session_str);
1854     }
1855     if (m_parent)
1856         m_parent->pre_init();
1857     delete this;
1858 }
1859
1860 const char *Yaz_ProxyClient::get_session_str()
1861 {
1862     if (!m_server)
1863         return "0 ";
1864     return m_server->get_session_str();
1865 }
1866
1867 void Yaz_ProxyClient::shutdown()
1868 {
1869     yaz_log (LOG_LOG, "%sShutdown (proxy to target) %s", get_session_str(),
1870              get_hostname());
1871     delete m_server;
1872     delete this;
1873 }
1874
1875 void Yaz_Proxy::failNotify()
1876 {
1877     yaz_log (LOG_LOG, "%sConnection closed by client",
1878              get_session_str());
1879     shutdown();
1880 }
1881
1882 void Yaz_ProxyClient::failNotify()
1883 {
1884     yaz_log (LOG_LOG, "%sConnection closed by target %s",
1885              get_session_str(), get_hostname());
1886     shutdown();
1887 }
1888
1889 void Yaz_ProxyClient::connectNotify()
1890 {
1891     const char *s = get_session_str();
1892     const char *h = get_hostname();
1893     yaz_log (LOG_LOG, "%sConnection accepted by %s timeout=%d", s, h,
1894              m_target_idletime);
1895     timeout(m_target_idletime);
1896     if (!m_server)
1897         pre_init_client();
1898 }
1899
1900 IYaz_PDU_Observer *Yaz_ProxyClient::sessionNotify(IYaz_PDU_Observable
1901                                                   *the_PDU_Observable, int fd)
1902 {
1903     return new Yaz_ProxyClient(the_PDU_Observable, 0);
1904 }
1905
1906 Yaz_ProxyClient::~Yaz_ProxyClient()
1907 {
1908     if (m_prev)
1909         *m_prev = m_next;
1910     if (m_next)
1911         m_next->m_prev = m_prev;
1912     m_waiting = 2;     // for debugging purposes only.
1913     odr_destroy(m_init_odr);
1914     delete m_last_query;
1915     xfree (m_last_resultSetId);
1916     xfree (m_cookie);
1917 }
1918
1919 void Yaz_ProxyClient::pre_init_client()
1920 {
1921     Z_APDU *apdu = create_Z_PDU(Z_APDU_initRequest);
1922     Z_InitRequest *req = apdu->u.initRequest;
1923
1924     ODR_MASK_SET(req->options, Z_Options_search);
1925     ODR_MASK_SET(req->options, Z_Options_present);
1926     ODR_MASK_SET(req->options, Z_Options_namedResultSets);
1927     ODR_MASK_SET(req->options, Z_Options_triggerResourceCtrl);
1928     ODR_MASK_SET(req->options, Z_Options_scan);
1929     ODR_MASK_SET(req->options, Z_Options_sort);
1930     ODR_MASK_SET(req->options, Z_Options_extendedServices);
1931     ODR_MASK_SET(req->options, Z_Options_delSet);
1932
1933     ODR_MASK_SET(req->protocolVersion, Z_ProtocolVersion_1);
1934     ODR_MASK_SET(req->protocolVersion, Z_ProtocolVersion_2);
1935     ODR_MASK_SET(req->protocolVersion, Z_ProtocolVersion_3);
1936
1937     if (send_to_target(apdu) < 0)
1938     {
1939         delete this;
1940     }
1941     else
1942     {
1943         m_waiting = 1;
1944         m_init_flag = 1;
1945     }
1946 }
1947
1948 void Yaz_Proxy::pre_init()
1949 {
1950     int i;
1951     const char *name = 0;
1952     const char *zurl_in_use[MAX_ZURL_PLEX];
1953     int limit_bw, limit_pdu, limit_req;
1954     int target_idletime, client_idletime;
1955     int max_clients;
1956     int keepalive_limit_bw, keepalive_limit_pdu;
1957     int pre_init;
1958     const char *cql2rpn = 0;
1959
1960     Yaz_ProxyConfig *cfg = check_reconfigure();
1961
1962     zurl_in_use[0] = 0;
1963
1964     if (m_log_mask & PROXY_LOG_APDU_CLIENT)
1965         set_APDU_yazlog(1);
1966     else
1967         set_APDU_yazlog(0);
1968
1969     for (i = 0; cfg && cfg->get_target_no(i, &name, zurl_in_use,
1970                                           &limit_bw, &limit_pdu, &limit_req,
1971                                           &target_idletime, &client_idletime,
1972                                           &max_clients,
1973                                           &keepalive_limit_bw,
1974                                           &keepalive_limit_pdu,
1975                                           &pre_init,
1976                                           &cql2rpn) ; i++)
1977     {
1978         if (pre_init)
1979         {
1980             int j;
1981             for (j = 0; zurl_in_use[j]; j++)
1982             {
1983                 Yaz_ProxyClient *c;
1984                 int spare = 0;
1985                 int in_use = 0;
1986                 int other = 0;
1987                 for (c = m_clientPool; c; c = c->m_next)
1988                 {
1989                     if (!strcmp(zurl_in_use[j], c->get_hostname()))
1990                     {
1991                         if (c->m_cookie == 0)
1992                         {
1993                             if (c->m_server == 0)
1994                                 spare++;
1995                             else
1996                                 in_use++;
1997                         }
1998                         else
1999                             other++;
2000                     }
2001                 }
2002                 yaz_log(LOG_LOG, "%spre-init %s %s use=%d other=%d spare=%d "
2003                         "preinit=%d",m_session_str,
2004                         name, zurl_in_use[j], in_use, other, spare, pre_init);
2005                 if (spare < pre_init)
2006                 {
2007                     c = new Yaz_ProxyClient(m_PDU_Observable->clone(), this);
2008                     c->m_next = m_clientPool;
2009                     if (c->m_next)
2010                         c->m_next->m_prev = &c->m_next;
2011                     m_clientPool = c;
2012                     c->m_prev = &m_clientPool;
2013
2014                     if (m_log_mask & PROXY_LOG_APDU_SERVER)
2015                         c->set_APDU_yazlog(1);
2016                     else
2017                         c->set_APDU_yazlog(0);
2018
2019                     if (c->client(zurl_in_use[j]))
2020                     {
2021                         timeout(60);
2022                         delete c;
2023                         return;
2024                     }
2025                     c->timeout(30);
2026                     c->m_waiting = 1;
2027                     c->m_target_idletime = target_idletime;
2028                     c->m_seqno = m_seqno++;
2029                 }
2030             }
2031         }
2032     }
2033 }
2034
2035 void Yaz_Proxy::timeoutNotify()
2036 {
2037     if (m_parent)
2038     {
2039         if (m_bw_hold_PDU)
2040         {
2041             timeout(m_client_idletime);
2042             Z_GDU *apdu = m_bw_hold_PDU;
2043             m_bw_hold_PDU = 0;
2044
2045             if (apdu->which == Z_GDU_Z3950)
2046                 handle_incoming_Z_PDU(apdu->u.z3950);
2047             else if (apdu->which == Z_GDU_HTTP_Request)
2048                 handle_incoming_HTTP(apdu->u.HTTP_Request);
2049         }
2050         else
2051         {
2052             yaz_log (LOG_LOG, "%sTimeout (client to proxy)", m_session_str);
2053             shutdown();
2054         }
2055     }
2056     else
2057     {
2058         timeout(600);
2059         pre_init();
2060     }
2061 }
2062
2063 void Yaz_ProxyClient::timeoutNotify()
2064 {
2065     yaz_log (LOG_LOG, "%sTimeout (proxy to target) %s", get_session_str(),
2066              get_hostname());
2067     m_waiting = 1;
2068     m_root->pre_init();
2069     shutdown();
2070 }
2071
2072 Yaz_ProxyClient::Yaz_ProxyClient(IYaz_PDU_Observable *the_PDU_Observable,
2073                                  Yaz_Proxy *parent) :
2074     Yaz_Z_Assoc (the_PDU_Observable)
2075 {
2076     m_cookie = 0;
2077     m_next = 0;
2078     m_prev = 0;
2079     m_init_flag = 0;
2080     m_last_query = 0;
2081     m_last_resultSetId = 0;
2082     m_last_resultCount = 0;
2083     m_last_ok = 0;
2084     m_sr_transform = 0;
2085     m_waiting = 0;
2086     m_init_odr = odr_createmem (ODR_DECODE);
2087     m_initResponse = 0;
2088     m_resultSetStartPoint = 0;
2089     m_bytes_sent = m_bytes_recv = 0;
2090     m_pdu_recv = 0;
2091     m_server = 0;
2092     m_seqno = 0;
2093     m_target_idletime = 600;
2094     m_root = parent;
2095 }
2096
2097 const char *Yaz_Proxy::option(const char *name, const char *value)
2098 {
2099     if (!strcmp (name, "optimize")) {
2100         if (value) {
2101             xfree (m_optimize);
2102             m_optimize = xstrdup (value);
2103         }
2104         return m_optimize;
2105     }
2106     return 0;
2107 }
2108
2109 void Yaz_ProxyClient::recv_HTTP_response(Z_HTTP_Response *apdu, int len)
2110 {
2111
2112 }
2113
2114 void Yaz_ProxyClient::recv_GDU(Z_GDU *apdu, int len)
2115 {
2116     if (apdu->which == Z_GDU_Z3950)
2117         recv_Z_PDU(apdu->u.z3950, len);
2118     else if (apdu->which == Z_GDU_HTTP_Response)
2119         recv_HTTP_response(apdu->u.HTTP_Response, len);
2120     else
2121         shutdown();
2122 }
2123
2124 int Yaz_Proxy::handle_init_response_for_invalid_session(Z_APDU *apdu)
2125 {
2126     if (!m_invalid_session)
2127         return 0;
2128     m_invalid_session = 0;
2129     handle_incoming_Z_PDU(m_apdu_invalid_session);
2130     assert (m_mem_invalid_session);
2131     nmem_destroy(m_mem_invalid_session);
2132     m_mem_invalid_session = 0;
2133     return 1;
2134 }
2135
2136 void Yaz_ProxyClient::recv_Z_PDU(Z_APDU *apdu, int len)
2137 {
2138     m_bytes_recv += len;
2139     m_pdu_recv++;
2140     m_waiting = 0;
2141     if (m_root->get_log_mask() & PROXY_LOG_REQ_SERVER)
2142         yaz_log (LOG_LOG, "%sReceiving %s from %s %d bytes", get_session_str(),
2143                  apdu_name(apdu), get_hostname(), len);
2144     if (apdu->which == Z_APDU_initResponse)
2145     {
2146         if (!m_server)  // if this is a pre init session , check for more
2147             m_root->pre_init();
2148         NMEM nmem = odr_extract_mem (odr_decode());
2149         odr_reset (m_init_odr);
2150         nmem_transfer (m_init_odr->mem, nmem);
2151         m_initResponse = apdu;
2152
2153         Z_InitResponse *ir = apdu->u.initResponse;
2154         char *im0 = ir->implementationName;
2155
2156         char *im1 = (char*)
2157             odr_malloc(m_init_odr, 20 + (im0 ? strlen(im0) : 0));
2158         *im1 = '\0';
2159         if (im0)
2160         {
2161             strcat(im1, im0);
2162             strcat(im1, " ");
2163         }
2164         strcat(im1, "(YAZ Proxy)");
2165         ir->implementationName = im1;
2166
2167         nmem_destroy (nmem);
2168
2169         if (m_server && m_server->handle_init_response_for_invalid_session(apdu))
2170             return;
2171     }
2172     if (apdu->which == Z_APDU_searchResponse)
2173     {
2174         Z_SearchResponse *sr = apdu->u.searchResponse;
2175         m_last_resultCount = *sr->resultCount;
2176         int status = *sr->searchStatus;
2177         if (status && (!sr->records || sr->records->which == Z_Records_DBOSD))
2178         {
2179             m_last_ok = 1;
2180
2181             if (sr->records && sr->records->which == Z_Records_DBOSD)
2182             {
2183                 m_cache.add(odr_decode(),
2184                             sr->records->u.databaseOrSurDiagnostics, 1,
2185                             *sr->resultCount);
2186             }
2187         }
2188     }
2189     if (apdu->which == Z_APDU_presentResponse)
2190     {
2191         Z_PresentResponse *pr = apdu->u.presentResponse;
2192         if (m_sr_transform)
2193         {
2194             m_sr_transform = 0;
2195             Z_APDU *new_apdu = create_Z_PDU(Z_APDU_searchResponse);
2196             Z_SearchResponse *sr = new_apdu->u.searchResponse;
2197             sr->referenceId = pr->referenceId;
2198             *sr->resultCount = m_last_resultCount;
2199             sr->records = pr->records;
2200             sr->nextResultSetPosition = pr->nextResultSetPosition;
2201             sr->numberOfRecordsReturned = pr->numberOfRecordsReturned;
2202             apdu = new_apdu;
2203         }
2204         if (pr->records &&
2205             pr->records->which == Z_Records_DBOSD && m_resultSetStartPoint)
2206         {
2207             m_cache.add(odr_decode(),
2208                         pr->records->u.databaseOrSurDiagnostics,
2209                         m_resultSetStartPoint, -1);
2210             m_resultSetStartPoint = 0;
2211         }
2212     }
2213     if (m_cookie)
2214         set_otherInformationString (apdu, VAL_COOKIE, 1, m_cookie);
2215     if (m_server)
2216     {
2217         m_server->send_to_client(apdu);
2218     }
2219     if (apdu->which == Z_APDU_close)
2220     {
2221         shutdown();
2222     }
2223 }
2224
2225 int Yaz_Proxy::server(const char *addr)
2226 {
2227     int r = Yaz_Z_Assoc::server(addr);
2228     if (!r)
2229     {
2230         yaz_log(LOG_LOG, "%sStarted listener on %s", m_session_str, addr);
2231         timeout(1);
2232     }
2233     return r;
2234 }
2235