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 static inline int XMPP_GetUtf8SequenceLength(const char *CharS, const char *CharE)
  85 {
  86         /* if this is is migrated to strbuf, remove this copy. */
  87         int n = 0;
  88         unsigned char test = (1<<7);
  89
  90         if ((*CharS & 0xC0) != 0xC0)
  91                 return 1;
  92
  93         while ((n < 8) &&
  94                ((test & ((unsigned char)*CharS)) != 0))
  95         {
  96                 test = test >> 1;
  97                 n ++;
  98         }
  99         if ((n > 6) || ((CharE - CharS) < n))
 100                 n = 0;
 101         return n;
 102 }
 103
 104
 105 /*
 106  * Given a source string and a target buffer, returns the string
 107  * properly escaped for insertion into an XML stream.  Returns a
 108  * pointer to the target buffer for convenience.
 109  *
 110  * BUG: this does not properly handle UTF-8
 111  */
 112 char *xmlesc(char *buf, char *str, int bufsiz)
 113 {
 114         char *ptr;
 115         char *eiptr;
 116         unsigned char ch;
 117         int inlen;
 118         int len = 0;
 119         int IsUtf8Sequence;
 120
 121         if (!buf) return(NULL);
 122         buf[0] = 0;
 123         len = 0;
 124         if (!str) {
 125                 return(buf);
 126         }
 127
 128         inlen = strlen(str);
 129         eiptr = str + inlen;
 130
 131         for (ptr=str; *ptr; ptr++) {
 132                 ch = *ptr;
 133                 if (ch == '<') {
 134                         strcpy(&buf[len], "&lt;");
 135                         len += 4;
 136                 }
 137                 else if (ch == '>') {
 138                         strcpy(&buf[len], "&gt;");
 139                         len += 4;
 140                 }
 141                 else if (ch == '&') {
 142                         strcpy(&buf[len], "&amp;");
 143                         len += 5;
 144                 }
 145                 else if ((ch >= 0x20) && (ch <= 0x7F)) {
 146                         buf[len++] = ch;
 147                         buf[len] = 0;
 148                 }
 149                 else if (ch < 0x20) {
 150                         /* we probably shouldn't be doing this */
 151                         buf[len++] = '_';
 152                         buf[len] = 0;
 153                 }
 154                 else {
 155                         char oct[32];
 156
 157                         IsUtf8Sequence =  XMPP_GetUtf8SequenceLength(&buf[len], eiptr);
 158                         if (IsUtf8Sequence)
 159                         {
 160                                 while (IsUtf8Sequence > 0){
 161                                         buf[len] = *ptr;
 162                                         len ++;
 163                                         if (--IsUtf8Sequence)
 164                                                 ptr++;
 165                                 }
 166                                 buf[len] = '\0';
 167                         }
 168                         else
 169                         {
 170                                 sprintf(oct, "&#%o;", ch);
 171                                 strcpy(&buf[len], oct);
 172                                 len += strlen(oct);
 173                         }
 174                 }
 175                 if ((len + 6) > bufsiz) {
 176                         return(buf);
 177                 }
 178         }
 179         return(buf);
 180 }
 181
 182
 183 /*
 184  * We have just received a <stream> tag from the client, so send them ours
 185  */
 186 void xmpp_stream_start(void *data, const char *supplied_el, const char **attr)
 187 {
 188         char xmlbuf[256];
 189
 190         while (*attr) {
 191                 if (!strcasecmp(attr[0], "to")) {
 192                         safestrncpy(XMPP->server_name, attr[1], sizeof XMPP->server_name);
 193                 }
 194                 attr += 2;
 195         }
 196
 197         cprintf("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
 198
 199         cprintf("<stream:stream ");
 200         cprintf("from=\"%s\" ", xmlesc(xmlbuf, XMPP->server_name, sizeof xmlbuf));
 201         cprintf("id=\"%08x\" ", CC->cs_pid);
 202         cprintf("version=\"1.0\" ");
 203         cprintf("xmlns:stream=\"http://etherx.jabber.org/streams\" ");
 204         cprintf("xmlns=\"jabber:client\">");
 205
 206         /* The features of this stream are... */
 207         cprintf("<stream:features>");
 208
 209         /*
 210          * TLS encryption (but only if it isn't already active)
 211          * /
 212 #ifdef HAVE_OPENSSL
 213         if (!CC->redirect_ssl) {
 214                 cprintf("<starttls xmlns='urn:ietf:params:xml:ns:xmpp-tls'></starttls>");
 215         }
 216 #endif
 217         */
 218         if (!CC->logged_in) {
 219                 /* If we're not logged in yet, offer SASL as our feature set */
 220                 xmpp_output_auth_mechs();
 221
 222                 /* Also offer non-SASL authentication */
 223                 cprintf("<auth xmlns=\"http://jabber.org/features/iq-auth\"/>");
 224         }
 225
 226         /* Offer binding and sessions as part of our feature set */
 227         cprintf("<bind xmlns=\"urn:ietf:params:xml:ns:xmpp-bind\"/>");
 228         cprintf("<session xmlns=\"urn:ietf:params:xml:ns:xmpp-session\"/>");
 229
 230         cprintf("</stream:features>");
 231
 232         CC->is_async = 1;               /* XMPP sessions are inherently async-capable */
 233 }
 234
 235
 236 void xmpp_xml_start(void *data, const char *supplied_el, const char **attr) {
 237         char el[256];
 238         char *sep = NULL;
 239         int i;
 240
 241         /* Axe the namespace, we don't care about it */
 242         safestrncpy(el, supplied_el, sizeof el);
 243         while (sep = strchr(el, ':'), sep) {
 244                 strcpy(el, ++sep);
 245         }
 246
 247         /*
 248         XMPP_syslog(LOG_DEBUG, "XMPP ELEMENT START: <%s>\n", el);
 249         for (i=0; attr[i] != NULL; i+=2) {
 250                 XMPP_syslog(LOG_DEBUG, "                    Attribute '%s' = '%s'\n", attr[i], attr[i+1]);
 251         }
 252         uncomment for more verbosity */
 253
 254         if (!strcasecmp(el, "stream")) {
 255                 xmpp_stream_start(data, supplied_el, attr);
 256         }
 257
 258         else if (!strcasecmp(el, "query")) {
 259                 XMPP->iq_query_xmlns[0] = 0;
 260                 safestrncpy(XMPP->iq_query_xmlns, supplied_el, sizeof XMPP->iq_query_xmlns);
 261         }
 262
 263         else if (!strcasecmp(el, "bind")) {
 264                 XMPP->bind_requested = 1;
 265         }
 266
 267         else if (!strcasecmp(el, "iq")) {
 268                 for (i=0; attr[i] != NULL; i+=2) {
 269                         if (!strcasecmp(attr[i], "type")) {
 270                                 safestrncpy(XMPP->iq_type, attr[i+1], sizeof XMPP->iq_type);
 271                         }
 272                         else if (!strcasecmp(attr[i], "id")) {
 273                                 safestrncpy(XMPP->iq_id, attr[i+1], sizeof XMPP->iq_id);
 274                         }
 275                         else if (!strcasecmp(attr[i], "from")) {
 276                                 safestrncpy(XMPP->iq_from, attr[i+1], sizeof XMPP->iq_from);
 277                         }
 278                         else if (!strcasecmp(attr[i], "to")) {
 279                                 safestrncpy(XMPP->iq_to, attr[i+1], sizeof XMPP->iq_to);
 280                         }
 281                 }
 282         }
 283
 284         else if (!strcasecmp(el, "auth")) {
 285                 XMPP->sasl_auth_mech[0] = 0;
 286                 for (i=0; attr[i] != NULL; i+=2) {
 287                         if (!strcasecmp(attr[i], "mechanism")) {
 288                                 safestrncpy(XMPP->sasl_auth_mech, attr[i+1], sizeof XMPP->sasl_auth_mech);
 289                         }
 290                 }
 291         }
 292
 293         else if (!strcasecmp(el, "message")) {
 294                 for (i=0; attr[i] != NULL; i+=2) {
 295                         if (!strcasecmp(attr[i], "to")) {
 296                                 safestrncpy(XMPP->message_to, attr[i+1], sizeof XMPP->message_to);
 297                         }
 298                 }
 299         }
 300
 301         else if (!strcasecmp(el, "html")) {
 302                 ++XMPP->html_tag_level;
 303         }
 304 }
 305
 306
 307
 308 void xmpp_xml_end(void *data, const char *supplied_el) {
 309         char el[256];
 310         char *sep = NULL;
 311         char xmlbuf[256];
 312
 313         /* Axe the namespace, we don't care about it */
 314         safestrncpy(el, supplied_el, sizeof el);
 315         while (sep = strchr(el, ':'), sep) {
 316                 strcpy(el, ++sep);
 317         }
 318
 319         /*
 320         XMPP_syslog(LOG_DEBUG, "XMPP ELEMENT END  : <%s>\n", el);
 321         if (XMPP->chardata_len > 0) {
 322                 XMPP_syslog(LOG_DEBUG, "          chardata: %s\n", XMPP->chardata);
 323         }
 324         uncomment for more verbosity */
 325
 326         if (!strcasecmp(el, "resource")) {
 327                 if (XMPP->chardata_len > 0) {
 328                         safestrncpy(XMPP->iq_client_resource, XMPP->chardata,
 329                                 sizeof XMPP->iq_client_resource);
 330                         striplt(XMPP->iq_client_resource);
 331                 }
 332         }
 333
 334         else if (!strcasecmp(el, "username")) {         /* NON SASL ONLY */
 335                 if (XMPP->chardata_len > 0) {
 336                         safestrncpy(XMPP->iq_client_username, XMPP->chardata,
 337                                 sizeof XMPP->iq_client_username);
 338                         striplt(XMPP->iq_client_username);
 339                 }
 340         }
 341
 342         else if (!strcasecmp(el, "password")) {         /* NON SASL ONLY */
 343                 if (XMPP->chardata_len > 0) {
 344                         safestrncpy(XMPP->iq_client_password, XMPP->chardata,
 345                                 sizeof XMPP->iq_client_password);
 346                         striplt(XMPP->iq_client_password);
 347                 }
 348         }
 349
 350         else if (!strcasecmp(el, "iq")) {
 351
 352                 /*
 353                  * iq type="get" (handle queries)
 354                  */
 355                 if (!strcasecmp(XMPP->iq_type, "get")) {
 356
 357                         /*
 358                          * Query on a namespace
 359                          */
 360                         if (!IsEmptyStr(XMPP->iq_query_xmlns)) {
 361                                 xmpp_query_namespace(XMPP->iq_id, XMPP->iq_from,
 362                                                 XMPP->iq_to, XMPP->iq_query_xmlns);
 363                         }
 364
 365                         /*
 366                          * ping ( http://xmpp.org/extensions/xep-0199.html )
 367                          */
 368                         else if (XMPP->ping_requested) {
 369                                 cprintf("<iq type=\"result\" ");
 370                                 if (!IsEmptyStr(XMPP->iq_from)) {
 371                                         cprintf("to=\"%s\" ", xmlesc(xmlbuf, XMPP->iq_from, sizeof xmlbuf));
 372                                 }
 373                                 if (!IsEmptyStr(XMPP->iq_to)) {
 374                                         cprintf("from=\"%s\" ", xmlesc(xmlbuf, XMPP->iq_to, sizeof xmlbuf));
 375                                 }
 376                                 cprintf("id=\"%s\"/>", xmlesc(xmlbuf, XMPP->iq_id, sizeof xmlbuf));
 377                         }
 378
 379                         /*
 380                          * Unknown query ... return the XML equivalent of a blank stare
 381                          */
 382                         else {
 383                                 XMPP_syslog(LOG_DEBUG,
 384                                             "Unknown query <%s> - returning <service-unavailable/>\n",
 385                                             el
 386                                 );
 387                                 cprintf("<iq type=\"error\" id=\"%s\">", xmlesc(xmlbuf, XMPP->iq_id, sizeof xmlbuf));
 388                                 cprintf("<error code=\"503\" type=\"cancel\">"
 389                                         "<service-unavailable xmlns=\"urn:ietf:params:xml:ns:xmpp-stanzas\"/>"
 390                                         "</error>"
 391                                 );
 392                                 cprintf("</iq>");
 393                         }
 394                 }
 395
 396                 /*
 397                  * Non SASL authentication
 398                  */
 399                 else if (
 400                         (!strcasecmp(XMPP->iq_type, "set"))
 401                         && (!strcasecmp(XMPP->iq_query_xmlns, "jabber:iq:auth:query"))
 402                         ) {
 403
 404                         xmpp_non_sasl_authenticate(
 405                                 XMPP->iq_id,
 406                                 XMPP->iq_client_username,
 407                                 XMPP->iq_client_password,
 408                                 XMPP->iq_client_resource
 409                         );
 410                 }
 411
 412                 /*
 413                  * If this <iq> stanza was a "bind" attempt, process it ...
 414                  */
 415                 else if (
 416                         (XMPP->bind_requested)
 417                         && (!IsEmptyStr(XMPP->iq_id))
 418                         && (!IsEmptyStr(XMPP->iq_client_resource))
 419                         && (CC->logged_in)
 420                         ) {
 421
 422                         /* Generate the "full JID" of the client resource */
 423
 424                         snprintf(XMPP->client_jid, sizeof XMPP->client_jid,
 425                                 "%s/%s",
 426                                 CC->cs_inet_email,
 427                                 XMPP->iq_client_resource
 428                         );
 429
 430                         /* Tell the client what its JID is */
 431
 432                         cprintf("<iq type=\"result\" id=\"%s\">", xmlesc(xmlbuf, XMPP->iq_id, sizeof xmlbuf));
 433                         cprintf("<bind xmlns=\"urn:ietf:params:xml:ns:xmpp-bind\">");
 434                         cprintf("<jid>%s</jid>", xmlesc(xmlbuf, XMPP->client_jid, sizeof xmlbuf));
 435                         cprintf("</bind>");
 436                         cprintf("</iq>");
 437                 }
 438
 439                 else if (XMPP->iq_session) {
 440                         cprintf("<iq type=\"result\" id=\"%s\">", xmlesc(xmlbuf, XMPP->iq_id, sizeof xmlbuf));
 441                         cprintf("</iq>");
 442                 }
 443
 444                 else {
 445                         cprintf("<iq type=\"error\" id=\"%s\">", xmlesc(xmlbuf, XMPP->iq_id, sizeof xmlbuf));
 446                         cprintf("<error>Don't know howto do '%s'!</error>", xmlesc(xmlbuf, XMPP->iq_type, sizeof xmlbuf));
 447                         cprintf("</iq>");
 448                 }
 449
 450                 /* Now clear these fields out so they don't get used by a future stanza */
 451                 XMPP->iq_id[0] = 0;
 452                 XMPP->iq_from[0] = 0;
 453                 XMPP->iq_to[0] = 0;
 454                 XMPP->iq_type[0] = 0;
 455                 XMPP->iq_client_resource[0] = 0;
 456                 XMPP->iq_session = 0;
 457                 XMPP->iq_query_xmlns[0] = 0;
 458                 XMPP->bind_requested = 0;
 459                 XMPP->ping_requested = 0;
 460         }
 461
 462         else if (!strcasecmp(el, "auth")) {
 463
 464                 /* Try to authenticate (this function is responsible for the output stanza) */
 465                 xmpp_sasl_auth(XMPP->sasl_auth_mech, (XMPP->chardata != NULL ? XMPP->chardata : "") );
 466
 467                 /* Now clear these fields out so they don't get used by a future stanza */
 468                 XMPP->sasl_auth_mech[0] = 0;
 469         }
 470
 471         else if (!strcasecmp(el, "session")) {
 472                 XMPP->iq_session = 1;
 473         }
 474
 475         else if (!strcasecmp(el, "presence")) {
 476
 477                 /* Respond to a <presence> update by firing back with presence information
 478                  * on the entire wholist.  Check this assumption, it's probably wrong.
 479                  */
 480                 xmpp_wholist_presence_dump();
 481         }
 482
 483         else if ( (!strcasecmp(el, "body")) && (XMPP->html_tag_level == 0) ) {
 484                 if (XMPP->message_body != NULL) {
 485                         free(XMPP->message_body);
 486                         XMPP->message_body = NULL;
 487                 }
 488                 if (XMPP->chardata_len > 0) {
 489                         XMPP->message_body = strdup(XMPP->chardata);
 490                 }
 491         }
 492
 493         else if (!strcasecmp(el, "message")) {
 494                 xmpp_send_message(XMPP->message_to, XMPP->message_body);
 495                 XMPP->html_tag_level = 0;
 496         }
 497
 498         else if (!strcasecmp(el, "html")) {
 499                 --XMPP->html_tag_level;
 500         }
 501
 502         else if (!strcasecmp(el, "starttls")) {
 503 #ifdef HAVE_OPENSSL
 504                 cprintf("<proceed xmlns='urn:ietf:params:xml:ns:xmpp-tls'/>");
 505                 CtdlModuleStartCryptoMsgs(NULL, NULL, NULL);
 506                 if (!CC->redirect_ssl) CC->kill_me = KILLME_NO_CRYPTO;
 507 #else
 508                 cprintf("<failure xmlns='urn:ietf:params:xml:ns:xmpp-tls'/>");
 509                 CC->kill_me = KILLME_NO_CRYPTO;
 510 #endif
 511         }
 512
 513         else if (!strcasecmp(el, "ping")) {
 514                 XMPP->ping_requested = 1;
 515         }
 516
 517         else if (!strcasecmp(el, "stream")) {
 518                 XMPPM_syslog(LOG_DEBUG, "XMPP client shut down their stream\n");
 519                 xmpp_massacre_roster();
 520                 cprintf("</stream>\n");
 521                 CC->kill_me = KILLME_CLIENT_LOGGED_OUT;
 522         }
 523
 524         else {
 525                 XMPP_syslog(LOG_DEBUG, "Ignoring unknown tag <%s>\n", el);
 526         }
 527
 528         XMPP->chardata_len = 0;
 529         if (XMPP->chardata_alloc > 0) {
 530                 XMPP->chardata[0] = 0;
 531         }
 532 }
 533
 534
 535 void xmpp_xml_chardata(void *data, const XML_Char *s, int len)
 536 {
 537         citxmpp *X = XMPP;
 538
 539         if (X->chardata_alloc == 0) {
 540                 X->chardata_alloc = SIZ;
 541                 X->chardata = malloc(X->chardata_alloc);
 542         }
 543         if ((X->chardata_len + len + 1) > X->chardata_alloc) {
 544                 X->chardata_alloc = X->chardata_len + len + 1024;
 545                 X->chardata = realloc(X->chardata, X->chardata_alloc);
 546         }
 547         memcpy(&X->chardata[X->chardata_len], s, len);
 548         X->chardata_len += len;
 549         X->chardata[X->chardata_len] = 0;
 550 }
 551
 552
 553 /*
 554  * This cleanup function blows away the temporary memory and files used by the XMPP service.
 555  */
 556 void xmpp_cleanup_function(void) {
 557
 558         /* Don't do this stuff if this is not a XMPP session! */
 559         if (CC->h_command_function != xmpp_command_loop) return;
 560
 561         if (XMPP->chardata != NULL) {
 562                 free(XMPP->chardata);
 563                 XMPP->chardata = NULL;
 564                 XMPP->chardata_len = 0;
 565                 XMPP->chardata_alloc = 0;
 566                 if (XMPP->message_body != NULL) {
 567                         free(XMPP->message_body);
 568                 }
 569         }
 570         XML_ParserFree(XMPP->xp);
 571         free(XMPP);
 572 }
 573
 574
 575
 576 /*
 577  * Here's where our XMPP session begins its happy day.
 578  */
 579 void xmpp_greeting(void) {
 580         client_set_inbound_buf(4);
 581         strcpy(CC->cs_clientname, "XMPP session");
 582         CC->session_specific_data = malloc(sizeof(citxmpp));
 583         memset(XMPP, 0, sizeof(citxmpp));
 584         XMPP->last_event_processed = queue_event_seq;
 585
 586         /* XMPP does not use a greeting, but we still have to initialize some things. */
 587
 588         XMPP->xp = XML_ParserCreateNS("UTF-8", ':');
 589         if (XMPP->xp == NULL) {
 590                 XMPPM_syslog(LOG_ALERT, "Cannot create XML parser!\n");
 591                 CC->kill_me = KILLME_XML_PARSER;
 592                 return;
 593         }
 594
 595         XML_SetElementHandler(XMPP->xp, xmpp_xml_start, xmpp_xml_end);
 596         XML_SetCharacterDataHandler(XMPP->xp, xmpp_xml_chardata);
 597         // XML_SetUserData(XMPP->xp, something...);
 598
 599         /* Prevent the "billion laughs" attack against expat by disabling
 600          * internal entity expansion.  With 2.x, forcibly stop the parser
 601          * if an entity is declared - this is safer and a more obvious
 602          * failure mode.  With older versions, simply prevent expansion
 603          * of such entities. */
 604 #ifdef HAVE_XML_STOPPARSER
 605         XML_SetEntityDeclHandler(XMPP->xp, xmpp_entity_declaration);
 606 #else
 607         XML_SetDefaultHandler(XMPP->xp, NULL);
 608 #endif
 609
 610         CC->can_receive_im = 1;         /* This protocol is capable of receiving instant messages */
 611 }
 612
 613
 614 /*
 615  * Main command loop for XMPP sessions.
 616  */
 617 void xmpp_command_loop(void) {
 618         int rc;
 619         StrBuf *stream_input = NewStrBuf();
 620
 621         time(&CC->lastcmd);
 622         rc = client_read_random_blob(stream_input, 30);
 623         if (rc > 0) {
 624                 XML_Parse(XMPP->xp, ChrPtr(stream_input), rc, 0);
 625         }
 626         else {
 627                 XMPPM_syslog(LOG_ERR, "client disconnected: ending session.\n");
 628                 CC->kill_me = KILLME_CLIENT_DISCONNECTED;
 629         }
 630         FreeStrBuf(&stream_input);
 631 }
 632
 633
 634 /*
 635  * Async loop for XMPP sessions (handles the transmission of unsolicited stanzas)
 636  */
 637 void xmpp_async_loop(void) {
 638         xmpp_process_events();
 639         xmpp_output_incoming_messages();
 640 }
 641
 642
 643 /*
 644  * Login hook for XMPP sessions
 645  */
 646 void xmpp_login_hook(void) {
 647         xmpp_queue_event(XMPP_EVT_LOGIN, CC->cs_inet_email);
 648 }
 649
 650
 651 /*
 652  * Logout hook for XMPP sessions
 653  */
 654 void xmpp_logout_hook(void) {
 655         xmpp_queue_event(XMPP_EVT_LOGOUT, CC->cs_inet_email);
 656 }
 657
 658
 659 void LogXMPPSrvDebugEnable(const int n)
 660 {
 661         XMPPSrvDebugEnable = n;
 662 }
 663 const char *CitadelServiceXMPP="XMPP";
 664 extern void xmpp_cleanup_events(void);
 665 CTDL_MODULE_INIT(xmpp)
 666 {
 667         if (!threading) {
 668                 CtdlRegisterServiceHook(config.c_xmpp_c2s_port,
 669                                         NULL,
 670                                         xmpp_greeting,
 671                                         xmpp_command_loop,
 672                                         xmpp_async_loop,
 673                                         CitadelServiceXMPP
 674                 );
 675                 CtdlRegisterDebugFlagHook(HKEY("serv_xmpp"), LogXMPPSrvDebugEnable, &XMPPSrvDebugEnable);
 676                 CtdlRegisterSessionHook(xmpp_cleanup_function, EVT_STOP, PRIO_STOP + 70);
 677                 CtdlRegisterSessionHook(xmpp_login_hook, EVT_LOGIN, PRIO_LOGIN + 90);
 678                 CtdlRegisterSessionHook(xmpp_logout_hook, EVT_LOGOUT, PRIO_LOGOUT + 90);
 679                 CtdlRegisterSessionHook(xmpp_login_hook, EVT_UNSTEALTH, PRIO_UNSTEALTH + 1);
 680                 CtdlRegisterSessionHook(xmpp_logout_hook, EVT_STEALTH, PRIO_STEALTH + 1);
 681                 CtdlRegisterCleanupHook(xmpp_cleanup_events);
 682
 683         }
 684
 685         /* return our module name for the log */
 686         return "xmpp";
 687 }