citadel/modules/xmpp/serv_xmpp.c

   1 /*
   2  * XMPP (Jabber) service for the Citadel system
   3  * Copyright (c) 2007-2011 by Art Cancro
   4  *
   5  * This program is open source software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 3 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18  */
  19
  20 #include "sysdep.h"
  21 #include <stdlib.h>
  22 #include <unistd.h>
  23 #include <stdio.h>
  24 #include <fcntl.h>
  25 #include <signal.h>
  26 #include <pwd.h>
  27 #include <errno.h>
  28 #include <sys/types.h>
  29
  30 #if TIME_WITH_SYS_TIME
  31 # include <sys/time.h>
  32 # include <time.h>
  33 #else
  34 # if HAVE_SYS_TIME_H
  35 #  include <sys/time.h>
  36 # else
  37 #  include <time.h>
  38 # endif
  39 #endif
  40
  41 #include <sys/wait.h>
  42 #include <string.h>
  43 #include <limits.h>
  44 #include <ctype.h>
  45 #include <libcitadel.h>
  46 #include <expat.h>
  47 #include "citadel.h"
  48 #include "server.h"
  49 #include "citserver.h"
  50 #include "support.h"
  51 #include "config.h"
  52 #include "user_ops.h"
  53 #include "database.h"
  54 #include "msgbase.h"
  55 #include "internet_addressing.h"
  56 #include "md5.h"
  57 #include "ctdl_module.h"
  58 #include "serv_xmpp.h"
  59
  60 /* XML_StopParser is present in expat 2.x */
  61 #if XML_MAJOR_VERSION > 1
  62 #define HAVE_XML_STOPPARSER
  63 #endif
  64
  65 struct xmpp_event *xmpp_queue = NULL;
  66
  67 int XMPPSrvDebugEnable = 0;
  68
  69
  70
  71 #ifdef HAVE_XML_STOPPARSER
  72 /* Stop the parser if an entity declaration is hit. */
  73 static void xmpp_entity_declaration(void *userData, const XML_Char *entityName,
  74                                 int is_parameter_entity, const XML_Char *value,
  75                                 int value_length, const XML_Char *base,
  76                                 const XML_Char *systemId, const XML_Char *publicId,
  77                                 const XML_Char *notationName
  78 ) {
  79         XMPPM_syslog(LOG_WARNING, "Illegal entity declaration encountered; stopping parser.");
  80         XML_StopParser(XMPP->xp, XML_FALSE);
  81 }
  82 #endif
  83
  84
  85
  86 /*
  87  * Given a source string and a target buffer, returns the string
  88  * properly escaped for insertion into an XML stream.  Returns a
  89  * pointer to the target buffer for convenience.
  90  *
  91  * BUG: this does not properly handle UTF-8
  92  */
  93 char *xmlesc(char *buf, char *str, int bufsiz)
  94 {
  95         char *ptr;
  96         unsigned char ch;
  97         int len = 0;
  98
  99         if (!buf) return(NULL);
 100         buf[0] = 0;
 101         len = 0;
 102         if (!str) {
 103                 return(buf);
 104         }
 105
 106         for (ptr=str; *ptr; ptr++) {
 107                 ch = *ptr;
 108                 if (ch == '<') {
 109                         strcpy(&buf[len], "&lt;");
 110                         len += 4;
 111                 }
 112                 else if (ch == '>') {
 113                         strcpy(&buf[len], "&gt;");
 114                         len += 4;
 115                 }
 116                 else if (ch == '&') {
 117                         strcpy(&buf[len], "&amp;");
 118                         len += 5;
 119                 }
 120                 else if ((ch >= 0x20) && (ch <= 0x7F)) {
 121                         buf[len++] = ch;
 122                         buf[len] = 0;
 123                 }
 124                 else if (ch < 0x20) {
 125                         /* we probably shouldn't be doing this */
 126                         buf[len++] = '_';
 127                         buf[len] = 0;
 128                 }
 129                 else {
 130                         char oct[10];
 131                         sprintf(oct, "&#%o;", ch);
 132                         strcpy(&buf[len], oct);
 133                         len += strlen(oct);
 134                 }
 135                 if ((len + 6) > bufsiz) {
 136                         return(buf);
 137                 }
 138         }
 139         return(buf);
 140 }
 141
 142
 143 /*
 144  * We have just received a <stream> tag from the client, so send them ours
 145  */
 146 void xmpp_stream_start(void *data, const char *supplied_el, const char **attr)
 147 {
 148         char xmlbuf[256];
 149
 150         while (*attr) {
 151                 if (!strcasecmp(attr[0], "to")) {
 152                         safestrncpy(XMPP->server_name, attr[1], sizeof XMPP->server_name);
 153                 }
 154                 attr += 2;
 155         }
 156
 157         cprintf("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
 158
 159         cprintf("<stream:stream ");
 160         cprintf("from=\"%s\" ", xmlesc(xmlbuf, XMPP->server_name, sizeof xmlbuf));
 161         cprintf("id=\"%08x\" ", CC->cs_pid);
 162         cprintf("version=\"1.0\" ");
 163         cprintf("xmlns:stream=\"http://etherx.jabber.org/streams\" ");
 164         cprintf("xmlns=\"jabber:client\">");
 165
 166         /* The features of this stream are... */
 167         cprintf("<stream:features>");
 168
 169         /*
 170          * TLS encryption (but only if it isn't already active)
 171          */
 172 #ifdef HAVE_OPENSSL
 173         if (!CC->redirect_ssl) {
 174                 cprintf("<starttls xmlns='urn:ietf:params:xml:ns:xmpp-tls'></starttls>");
 175         }
 176 #endif
 177
 178         if (!CC->logged_in) {
 179                 /* If we're not logged in yet, offer SASL as our feature set */
 180                 xmpp_output_auth_mechs();
 181
 182                 /* Also offer non-SASL authentication */
 183                 cprintf("<auth xmlns=\"http://jabber.org/features/iq-auth\"/>");
 184         }
 185
 186         /* Offer binding and sessions as part of our feature set */
 187         cprintf("<bind xmlns=\"urn:ietf:params:xml:ns:xmpp-bind\"/>");
 188         cprintf("<session xmlns=\"urn:ietf:params:xml:ns:xmpp-session\"/>");
 189
 190         cprintf("</stream:features>");
 191
 192         CC->is_async = 1;               /* XMPP sessions are inherently async-capable */
 193 }
 194
 195
 196 void xmpp_xml_start(void *data, const char *supplied_el, const char **attr) {
 197         char el[256];
 198         char *sep = NULL;
 199         int i;
 200
 201         /* Axe the namespace, we don't care about it */
 202         safestrncpy(el, supplied_el, sizeof el);
 203         while (sep = strchr(el, ':'), sep) {
 204                 strcpy(el, ++sep);
 205         }
 206
 207         /*
 208         XMPP_syslog(LOG_DEBUG, "XMPP ELEMENT START: <%s>\n", el);
 209         for (i=0; attr[i] != NULL; i+=2) {
 210                 XMPP_syslog(LOG_DEBUG, "                    Attribute '%s' = '%s'\n", attr[i], attr[i+1]);
 211         }
 212         uncomment for more verbosity */
 213
 214         if (!strcasecmp(el, "stream")) {
 215                 xmpp_stream_start(data, supplied_el, attr);
 216         }
 217
 218         else if (!strcasecmp(el, "query")) {
 219                 XMPP->iq_query_xmlns[0] = 0;
 220                 safestrncpy(XMPP->iq_query_xmlns, supplied_el, sizeof XMPP->iq_query_xmlns);
 221         }
 222
 223         else if (!strcasecmp(el, "bind")) {
 224                 XMPP->bind_requested = 1;
 225         }
 226
 227         else if (!strcasecmp(el, "iq")) {
 228                 for (i=0; attr[i] != NULL; i+=2) {
 229                         if (!strcasecmp(attr[i], "type")) {
 230                                 safestrncpy(XMPP->iq_type, attr[i+1], sizeof XMPP->iq_type);
 231                         }
 232                         else if (!strcasecmp(attr[i], "id")) {
 233                                 safestrncpy(XMPP->iq_id, attr[i+1], sizeof XMPP->iq_id);
 234                         }
 235                         else if (!strcasecmp(attr[i], "from")) {
 236                                 safestrncpy(XMPP->iq_from, attr[i+1], sizeof XMPP->iq_from);
 237                         }
 238                         else if (!strcasecmp(attr[i], "to")) {
 239                                 safestrncpy(XMPP->iq_to, attr[i+1], sizeof XMPP->iq_to);
 240                         }
 241                 }
 242         }
 243
 244         else if (!strcasecmp(el, "auth")) {
 245                 XMPP->sasl_auth_mech[0] = 0;
 246                 for (i=0; attr[i] != NULL; i+=2) {
 247                         if (!strcasecmp(attr[i], "mechanism")) {
 248                                 safestrncpy(XMPP->sasl_auth_mech, attr[i+1], sizeof XMPP->sasl_auth_mech);
 249                         }
 250                 }
 251         }
 252
 253         else if (!strcasecmp(el, "message")) {
 254                 for (i=0; attr[i] != NULL; i+=2) {
 255                         if (!strcasecmp(attr[i], "to")) {
 256                                 safestrncpy(XMPP->message_to, attr[i+1], sizeof XMPP->message_to);
 257                         }
 258                 }
 259         }
 260
 261         else if (!strcasecmp(el, "html")) {
 262                 ++XMPP->html_tag_level;
 263         }
 264 }
 265
 266
 267
 268 void xmpp_xml_end(void *data, const char *supplied_el) {
 269         char el[256];
 270         char *sep = NULL;
 271         char xmlbuf[256];
 272
 273         /* Axe the namespace, we don't care about it */
 274         safestrncpy(el, supplied_el, sizeof el);
 275         while (sep = strchr(el, ':'), sep) {
 276                 strcpy(el, ++sep);
 277         }
 278
 279         /*
 280         XMPP_syslog(LOG_DEBUG, "XMPP ELEMENT END  : <%s>\n", el);
 281         if (XMPP->chardata_len > 0) {
 282                 XMPP_syslog(LOG_DEBUG, "          chardata: %s\n", XMPP->chardata);
 283         }
 284         uncomment for more verbosity */
 285
 286         if (!strcasecmp(el, "resource")) {
 287                 if (XMPP->chardata_len > 0) {
 288                         safestrncpy(XMPP->iq_client_resource, XMPP->chardata,
 289                                 sizeof XMPP->iq_client_resource);
 290                         striplt(XMPP->iq_client_resource);
 291                 }
 292         }
 293
 294         else if (!strcasecmp(el, "username")) {         /* NON SASL ONLY */
 295                 if (XMPP->chardata_len > 0) {
 296                         safestrncpy(XMPP->iq_client_username, XMPP->chardata,
 297                                 sizeof XMPP->iq_client_username);
 298                         striplt(XMPP->iq_client_username);
 299                 }
 300         }
 301
 302         else if (!strcasecmp(el, "password")) {         /* NON SASL ONLY */
 303                 if (XMPP->chardata_len > 0) {
 304                         safestrncpy(XMPP->iq_client_password, XMPP->chardata,
 305                                 sizeof XMPP->iq_client_password);
 306                         striplt(XMPP->iq_client_password);
 307                 }
 308         }
 309
 310         else if (!strcasecmp(el, "iq")) {
 311
 312                 /*
 313                  * iq type="get" (handle queries)
 314                  */
 315                 if (!strcasecmp(XMPP->iq_type, "get")) {
 316
 317                         /*
 318                          * Query on a namespace
 319                          */
 320                         if (!IsEmptyStr(XMPP->iq_query_xmlns)) {
 321                                 xmpp_query_namespace(XMPP->iq_id, XMPP->iq_from,
 322                                                 XMPP->iq_to, XMPP->iq_query_xmlns);
 323                         }
 324
 325                         /*
 326                          * ping ( http://xmpp.org/extensions/xep-0199.html )
 327                          */
 328                         else if (XMPP->ping_requested) {
 329                                 cprintf("<iq type=\"result\" ");
 330                                 if (!IsEmptyStr(XMPP->iq_from)) {
 331                                         cprintf("to=\"%s\" ", xmlesc(xmlbuf, XMPP->iq_from, sizeof xmlbuf));
 332                                 }
 333                                 if (!IsEmptyStr(XMPP->iq_to)) {
 334                                         cprintf("from=\"%s\" ", xmlesc(xmlbuf, XMPP->iq_to, sizeof xmlbuf));
 335                                 }
 336                                 cprintf("id=\"%s\"/>", xmlesc(xmlbuf, XMPP->iq_id, sizeof xmlbuf));
 337                         }
 338
 339                         /*
 340                          * Unknown query ... return the XML equivalent of a blank stare
 341                          */
 342                         else {
 343                                 XMPP_syslog(LOG_DEBUG,
 344                                             "Unknown query <%s> - returning <service-unavailable/>\n",
 345                                             el
 346                                 );
 347                                 cprintf("<iq type=\"error\" id=\"%s\">", xmlesc(xmlbuf, XMPP->iq_id, sizeof xmlbuf));
 348                                 cprintf("<error code=\"503\" type=\"cancel\">"
 349                                         "<service-unavailable xmlns=\"urn:ietf:params:xml:ns:xmpp-stanzas\"/>"
 350                                         "</error>"
 351                                 );
 352                                 cprintf("</iq>");
 353                         }
 354                 }
 355
 356                 /*
 357                  * Non SASL authentication
 358                  */
 359                 else if (
 360                         (!strcasecmp(XMPP->iq_type, "set"))
 361                         && (!strcasecmp(XMPP->iq_query_xmlns, "jabber:iq:auth:query"))
 362                         ) {
 363
 364                         xmpp_non_sasl_authenticate(
 365                                 XMPP->iq_id,
 366                                 XMPP->iq_client_username,
 367                                 XMPP->iq_client_password,
 368                                 XMPP->iq_client_resource
 369                         );
 370                 }
 371
 372                 /*
 373                  * If this <iq> stanza was a "bind" attempt, process it ...
 374                  */
 375                 else if (
 376                         (XMPP->bind_requested)
 377                         && (!IsEmptyStr(XMPP->iq_id))
 378                         && (!IsEmptyStr(XMPP->iq_client_resource))
 379                         && (CC->logged_in)
 380                         ) {
 381
 382                         /* Generate the "full JID" of the client resource */
 383
 384                         snprintf(XMPP->client_jid, sizeof XMPP->client_jid,
 385                                 "%s/%s",
 386                                 CC->cs_inet_email,
 387                                 XMPP->iq_client_resource
 388                         );
 389
 390                         /* Tell the client what its JID is */
 391
 392                         cprintf("<iq type=\"result\" id=\"%s\">", xmlesc(xmlbuf, XMPP->iq_id, sizeof xmlbuf));
 393                         cprintf("<bind xmlns=\"urn:ietf:params:xml:ns:xmpp-bind\">");
 394                         cprintf("<jid>%s</jid>", xmlesc(xmlbuf, XMPP->client_jid, sizeof xmlbuf));
 395                         cprintf("</bind>");
 396                         cprintf("</iq>");
 397                 }
 398
 399                 else if (XMPP->iq_session) {
 400                         cprintf("<iq type=\"result\" id=\"%s\">", xmlesc(xmlbuf, XMPP->iq_id, sizeof xmlbuf));
 401                         cprintf("</iq>");
 402                 }
 403
 404                 else {
 405                         cprintf("<iq type=\"error\" id=\"%s\">", xmlesc(xmlbuf, XMPP->iq_id, sizeof xmlbuf));
 406                         cprintf("<error>Don't know howto do '%s'!</error>", xmlesc(xmlbuf, XMPP->iq_type, sizeof xmlbuf));
 407                         cprintf("</iq>");
 408                 }
 409
 410                 /* Now clear these fields out so they don't get used by a future stanza */
 411                 XMPP->iq_id[0] = 0;
 412                 XMPP->iq_from[0] = 0;
 413                 XMPP->iq_to[0] = 0;
 414                 XMPP->iq_type[0] = 0;
 415                 XMPP->iq_client_resource[0] = 0;
 416                 XMPP->iq_session = 0;
 417                 XMPP->iq_query_xmlns[0] = 0;
 418                 XMPP->bind_requested = 0;
 419                 XMPP->ping_requested = 0;
 420         }
 421
 422         else if (!strcasecmp(el, "auth")) {
 423
 424                 /* Try to authenticate (this function is responsible for the output stanza) */
 425                 xmpp_sasl_auth(XMPP->sasl_auth_mech, (XMPP->chardata != NULL ? XMPP->chardata : "") );
 426
 427                 /* Now clear these fields out so they don't get used by a future stanza */
 428                 XMPP->sasl_auth_mech[0] = 0;
 429         }
 430
 431         else if (!strcasecmp(el, "session")) {
 432                 XMPP->iq_session = 1;
 433         }
 434
 435         else if (!strcasecmp(el, "presence")) {
 436
 437                 /* Respond to a <presence> update by firing back with presence information
 438                  * on the entire wholist.  Check this assumption, it's probably wrong.
 439                  */
 440                 xmpp_wholist_presence_dump();
 441         }
 442
 443         else if ( (!strcasecmp(el, "body")) && (XMPP->html_tag_level == 0) ) {
 444                 if (XMPP->message_body != NULL) {
 445                         free(XMPP->message_body);
 446                         XMPP->message_body = NULL;
 447                 }
 448                 if (XMPP->chardata_len > 0) {
 449                         XMPP->message_body = strdup(XMPP->chardata);
 450                 }
 451         }
 452
 453         else if (!strcasecmp(el, "message")) {
 454                 xmpp_send_message(XMPP->message_to, XMPP->message_body);
 455                 XMPP->html_tag_level = 0;
 456         }
 457
 458         else if (!strcasecmp(el, "html")) {
 459                 --XMPP->html_tag_level;
 460         }
 461
 462         else if (!strcasecmp(el, "starttls")) {
 463 #ifdef HAVE_OPENSSL
 464                 cprintf("<proceed xmlns='urn:ietf:params:xml:ns:xmpp-tls'/>");
 465                 CtdlModuleStartCryptoMsgs(NULL, NULL, NULL);
 466                 if (!CC->redirect_ssl) CC->kill_me = KILLME_NO_CRYPTO;
 467 #else
 468                 cprintf("<failure xmlns='urn:ietf:params:xml:ns:xmpp-tls'/>");
 469                 CC->kill_me = KILLME_NO_CRYPTO;
 470 #endif
 471         }
 472
 473         else if (!strcasecmp(el, "ping")) {
 474                 XMPP->ping_requested = 1;
 475         }
 476
 477         else if (!strcasecmp(el, "stream")) {
 478                 XMPPM_syslog(LOG_DEBUG, "XMPP client shut down their stream\n");
 479                 xmpp_massacre_roster();
 480                 cprintf("</stream>\n");
 481                 CC->kill_me = KILLME_CLIENT_LOGGED_OUT;
 482         }
 483
 484         else if (!strcasecmp(el, "query")) {
 485                 /* already processed , no further action needed here */
 486         }
 487
 488         else if (!strcasecmp(el, "bind")) {
 489                 /* already processed , no further action needed here */
 490         }
 491
 492         else {
 493                 XMPP_syslog(LOG_DEBUG, "Ignoring unknown tag <%s>\n", el);
 494         }
 495
 496         XMPP->chardata_len = 0;
 497         if (XMPP->chardata_alloc > 0) {
 498                 XMPP->chardata[0] = 0;
 499         }
 500 }
 501
 502
 503 void xmpp_xml_chardata(void *data, const XML_Char *s, int len)
 504 {
 505         citxmpp *X = XMPP;
 506
 507         if (X->chardata_alloc == 0) {
 508                 X->chardata_alloc = SIZ;
 509                 X->chardata = malloc(X->chardata_alloc);
 510         }
 511         if ((X->chardata_len + len + 1) > X->chardata_alloc) {
 512                 X->chardata_alloc = X->chardata_len + len + 1024;
 513                 X->chardata = realloc(X->chardata, X->chardata_alloc);
 514         }
 515         memcpy(&X->chardata[X->chardata_len], s, len);
 516         X->chardata_len += len;
 517         X->chardata[X->chardata_len] = 0;
 518 }
 519
 520
 521 /*
 522  * This cleanup function blows away the temporary memory and files used by the XMPP service.
 523  */
 524 void xmpp_cleanup_function(void) {
 525
 526         /* Don't do this stuff if this is not a XMPP session! */
 527         if (CC->h_command_function != xmpp_command_loop) return;
 528
 529         if (XMPP->chardata != NULL) {
 530                 free(XMPP->chardata);
 531                 XMPP->chardata = NULL;
 532                 XMPP->chardata_len = 0;
 533                 XMPP->chardata_alloc = 0;
 534                 if (XMPP->message_body != NULL) {
 535                         free(XMPP->message_body);
 536                 }
 537         }
 538         XML_ParserFree(XMPP->xp);
 539         free(XMPP);
 540 }
 541
 542
 543
 544 /*
 545  * Here's where our XMPP session begins its happy day.
 546  */
 547 void xmpp_greeting(void) {
 548         client_set_inbound_buf(4);
 549         strcpy(CC->cs_clientname, "XMPP session");
 550         CC->session_specific_data = malloc(sizeof(citxmpp));
 551         memset(XMPP, 0, sizeof(citxmpp));
 552         XMPP->last_event_processed = queue_event_seq;
 553
 554         /* XMPP does not use a greeting, but we still have to initialize some things. */
 555
 556         XMPP->xp = XML_ParserCreateNS("UTF-8", ':');
 557         if (XMPP->xp == NULL) {
 558                 XMPPM_syslog(LOG_ALERT, "Cannot create XML parser!\n");
 559                 CC->kill_me = KILLME_XML_PARSER;
 560                 return;
 561         }
 562
 563         XML_SetElementHandler(XMPP->xp, xmpp_xml_start, xmpp_xml_end);
 564         XML_SetCharacterDataHandler(XMPP->xp, xmpp_xml_chardata);
 565         // XML_SetUserData(XMPP->xp, something...);
 566
 567         /* Prevent the "billion laughs" attack against expat by disabling
 568          * internal entity expansion.  With 2.x, forcibly stop the parser
 569          * if an entity is declared - this is safer and a more obvious
 570          * failure mode.  With older versions, simply prevent expansion
 571          * of such entities. */
 572 #ifdef HAVE_XML_STOPPARSER
 573         XML_SetEntityDeclHandler(XMPP->xp, xmpp_entity_declaration);
 574 #else
 575         XML_SetDefaultHandler(XMPP->xp, NULL);
 576 #endif
 577
 578         CC->can_receive_im = 1;         /* This protocol is capable of receiving instant messages */
 579 }
 580
 581
 582 /*
 583  * Main command loop for XMPP sessions.
 584  */
 585 void xmpp_command_loop(void) {
 586         int rc;
 587         StrBuf *stream_input = NewStrBuf();
 588
 589         time(&CC->lastcmd);
 590         rc = client_read_random_blob(stream_input, 30);
 591         if (rc > 0) {
 592                 XML_Parse(XMPP->xp, ChrPtr(stream_input), rc, 0);
 593         }
 594         else {
 595                 XMPPM_syslog(LOG_ERR, "client disconnected: ending session.\n");
 596                 CC->kill_me = KILLME_CLIENT_DISCONNECTED;
 597         }
 598         FreeStrBuf(&stream_input);
 599 }
 600
 601
 602 /*
 603  * Async loop for XMPP sessions (handles the transmission of unsolicited stanzas)
 604  */
 605 void xmpp_async_loop(void) {
 606         xmpp_process_events();
 607         xmpp_output_incoming_messages();
 608 }
 609
 610
 611 /*
 612  * Login hook for XMPP sessions
 613  */
 614 void xmpp_login_hook(void) {
 615         xmpp_queue_event(XMPP_EVT_LOGIN, CC->cs_inet_email);
 616 }
 617
 618
 619 /*
 620  * Logout hook for XMPP sessions
 621  */
 622 void xmpp_logout_hook(void) {
 623         xmpp_queue_event(XMPP_EVT_LOGOUT, CC->cs_inet_email);
 624 }
 625
 626
 627 void LogXMPPSrvDebugEnable(const int n)
 628 {
 629         XMPPSrvDebugEnable = n;
 630 }
 631 const char *CitadelServiceXMPP="XMPP";
 632 extern void xmpp_cleanup_events(void);
 633 CTDL_MODULE_INIT(xmpp)
 634 {
 635         if (!threading) {
 636                 CtdlRegisterServiceHook(config.c_xmpp_c2s_port,
 637                                         NULL,
 638                                         xmpp_greeting,
 639                                         xmpp_command_loop,
 640                                         xmpp_async_loop,
 641                                         CitadelServiceXMPP
 642                 );
 643                 CtdlRegisterDebugFlagHook(HKEY("serv_xmpp"), LogXMPPSrvDebugEnable, &XMPPSrvDebugEnable);
 644                 CtdlRegisterSessionHook(xmpp_cleanup_function, EVT_STOP, PRIO_STOP + 70);
 645                 CtdlRegisterSessionHook(xmpp_login_hook, EVT_LOGIN, PRIO_LOGIN + 90);
 646                 CtdlRegisterSessionHook(xmpp_logout_hook, EVT_LOGOUT, PRIO_LOGOUT + 90);
 647                 CtdlRegisterSessionHook(xmpp_login_hook, EVT_UNSTEALTH, PRIO_UNSTEALTH + 1);
 648                 CtdlRegisterSessionHook(xmpp_logout_hook, EVT_STEALTH, PRIO_STEALTH + 1);
 649                 CtdlRegisterCleanupHook(xmpp_cleanup_events);
 650
 651         }
 652
 653         /* return our module name for the log */
 654         return "xmpp";
 655 }