citadel/modules/xmpp/serv_xmpp.c

   1 /*
   2  * XMPP (Jabber) service for the Citadel system
   3  * Copyright (c) 2007-2015 by Art Cancro and citadel.org
   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 static inline int Ctdl_GetUtf8SequenceLength(const char *CharS, const char *CharE)
  92 {
  93         int n = 0;
  94         unsigned char test = (1<<7);
  95
  96         if ((*CharS & 0xC0) != 0xC0)
  97                 return 1;
  98
  99         while ((n < 8) &&
 100                ((test & ((unsigned char)*CharS)) != 0))
 101         {
 102                 test = test >> 1;
 103                 n ++;
 104         }
 105         if ((n > 6) || ((CharE - CharS) < n))
 106                 n = 0;
 107         return n;
 108 }
 109
 110 char *xmlesc(char *buf, char *str, int bufsiz)
 111 {
 112         int IsUtf8Sequence;
 113         char *ptr, *pche;
 114         unsigned char ch;
 115         int inlen;
 116         int len = 0;
 117
 118         if (!buf) return(NULL);
 119         buf[0] = 0;
 120         len = 0;
 121         if (!str) {
 122                 return(buf);
 123         }
 124         inlen = strlen(str);
 125         pche = str + inlen;
 126
 127         for (ptr=str; *ptr; ptr++) {
 128                 ch = *ptr;
 129                 if (ch == '<') {
 130                         strcpy(&buf[len], "&lt;");
 131                         len += 4;
 132                 }
 133                 else if (ch == '>') {
 134                         strcpy(&buf[len], "&gt;");
 135                         len += 4;
 136                 }
 137                 else if (ch == '&') {
 138                         strcpy(&buf[len], "&amp;");
 139                         len += 5;
 140                 }
 141                 else if ((ch >= 0x20) && (ch <= 0x7F)) {
 142                         buf[len++] = ch;
 143                         buf[len] = 0;
 144                 }
 145                 else if (ch < 0x20) {
 146                         /* we probably shouldn't be doing this */
 147                         buf[len++] = '_';
 148                         buf[len] = 0;
 149                 }
 150                 else {
 151                         IsUtf8Sequence =  Ctdl_GetUtf8SequenceLength(ptr, pche);
 152                         if (IsUtf8Sequence)
 153                         {
 154                                 while ((IsUtf8Sequence > 0) &&
 155                                        (ptr < pche))
 156                                 {
 157                                         buf[len] = *ptr;
 158                                         ptr ++;
 159                                         --IsUtf8Sequence;
 160                                 }
 161                         }
 162                         else
 163                         {
 164                                 char oct[10];
 165                                 sprintf(oct, "&#%o;", ch);
 166                                 strcpy(&buf[len], oct);
 167                                 len += strlen(oct);
 168                         }
 169                 }
 170                 if ((len + 6) > bufsiz) {
 171                         return(buf);
 172                 }
 173         }
 174         return(buf);
 175 }
 176
 177
 178 /*
 179  * We have just received a <stream> tag from the client, so send them ours
 180  */
 181 void xmpp_stream_start(void *data, const char *supplied_el, const char **attr)
 182 {
 183         char xmlbuf[256];
 184
 185         while (*attr) {
 186                 if (!strcasecmp(attr[0], "to")) {
 187                         safestrncpy(XMPP->server_name, attr[1], sizeof XMPP->server_name);
 188                 }
 189                 attr += 2;
 190         }
 191
 192         cprintf("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
 193
 194         cprintf("<stream:stream ");
 195         cprintf("from=\"%s\" ", xmlesc(xmlbuf, XMPP->server_name, sizeof xmlbuf));
 196         cprintf("id=\"%08x\" ", CC->cs_pid);
 197         cprintf("version=\"1.0\" ");
 198         cprintf("xmlns:stream=\"http://etherx.jabber.org/streams\" ");
 199         cprintf("xmlns=\"jabber:client\">");
 200
 201         /* The features of this stream are... */
 202         cprintf("<stream:features>");
 203
 204         /*
 205          * TLS encryption (but only if it isn't already active)
 206          */
 207 #ifdef HAVE_OPENSSL
 208         if (!CC->redirect_ssl) {
 209                 cprintf("<starttls xmlns='urn:ietf:params:xml:ns:xmpp-tls'></starttls>");
 210         }
 211 #endif
 212
 213         if (!CC->logged_in) {
 214                 /* If we're not logged in yet, offer SASL as our feature set */
 215                 xmpp_output_auth_mechs();
 216
 217                 /* Also offer non-SASL authentication */
 218                 cprintf("<auth xmlns=\"http://jabber.org/features/iq-auth\"/>");
 219         }
 220
 221         /* Offer binding and sessions as part of our feature set */
 222         cprintf("<bind xmlns=\"urn:ietf:params:xml:ns:xmpp-bind\"/>");
 223         cprintf("<session xmlns=\"urn:ietf:params:xml:ns:xmpp-session\"/>");
 224
 225         cprintf("</stream:features>");
 226
 227         CC->is_async = 1;               /* XMPP sessions are inherently async-capable */
 228 }
 229
 230
 231 void xmpp_xml_start(void *data, const char *supplied_el, const char **attr) {
 232         char el[256];
 233         char *sep = NULL;
 234         int i;
 235
 236         /* Axe the namespace, we don't care about it */
 237         safestrncpy(el, supplied_el, sizeof el);
 238         while (sep = strchr(el, ':'), sep) {
 239                 strcpy(el, ++sep);
 240         }
 241
 242         /*
 243         XMPP_syslog(LOG_DEBUG, "XMPP ELEMENT START: <%s>\n", el);
 244         for (i=0; attr[i] != NULL; i+=2) {
 245                 XMPP_syslog(LOG_DEBUG, "                    Attribute '%s' = '%s'\n", attr[i], attr[i+1]);
 246         }
 247         uncomment for more verbosity */
 248
 249         if (!strcasecmp(el, "stream")) {
 250                 xmpp_stream_start(data, supplied_el, attr);
 251         }
 252
 253         else if (!strcasecmp(el, "query")) {
 254                 XMPP->iq_query_xmlns[0] = 0;
 255                 safestrncpy(XMPP->iq_query_xmlns, supplied_el, sizeof XMPP->iq_query_xmlns);
 256         }
 257
 258         else if (!strcasecmp(el, "bind")) {
 259                 XMPP->bind_requested = 1;
 260         }
 261
 262         else if (!strcasecmp(el, "iq")) {
 263                 for (i=0; attr[i] != NULL; i+=2) {
 264                         if (!strcasecmp(attr[i], "type")) {
 265                                 safestrncpy(XMPP->iq_type, attr[i+1], sizeof XMPP->iq_type);
 266                         }
 267                         else if (!strcasecmp(attr[i], "id")) {
 268                                 safestrncpy(XMPP->iq_id, attr[i+1], sizeof XMPP->iq_id);
 269                         }
 270                         else if (!strcasecmp(attr[i], "from")) {
 271                                 safestrncpy(XMPP->iq_from, attr[i+1], sizeof XMPP->iq_from);
 272                         }
 273                         else if (!strcasecmp(attr[i], "to")) {
 274                                 safestrncpy(XMPP->iq_to, attr[i+1], sizeof XMPP->iq_to);
 275                         }
 276                 }
 277         }
 278
 279         else if (!strcasecmp(el, "auth")) {
 280                 XMPP->sasl_auth_mech[0] = 0;
 281                 for (i=0; attr[i] != NULL; i+=2) {
 282                         if (!strcasecmp(attr[i], "mechanism")) {
 283                                 safestrncpy(XMPP->sasl_auth_mech, attr[i+1], sizeof XMPP->sasl_auth_mech);
 284                         }
 285                 }
 286         }
 287
 288         else if (!strcasecmp(el, "message")) {
 289                 for (i=0; attr[i] != NULL; i+=2) {
 290                         if (!strcasecmp(attr[i], "to")) {
 291                                 safestrncpy(XMPP->message_to, attr[i+1], sizeof XMPP->message_to);
 292                         }
 293                 }
 294         }
 295
 296         else if (!strcasecmp(el, "html")) {
 297                 ++XMPP->html_tag_level;
 298         }
 299 }
 300
 301
 302
 303 void xmpp_xml_end(void *data, const char *supplied_el) {
 304         char el[256];
 305         char *sep = NULL;
 306         char xmlbuf[256];
 307
 308         /* Axe the namespace, we don't care about it */
 309         safestrncpy(el, supplied_el, sizeof el);
 310         while (sep = strchr(el, ':'), sep) {
 311                 strcpy(el, ++sep);
 312         }
 313
 314         /*
 315         XMPP_syslog(LOG_DEBUG, "XMPP ELEMENT END  : <%s>\n", el);
 316         if (XMPP->chardata_len > 0) {
 317                 XMPP_syslog(LOG_DEBUG, "          chardata: %s\n", XMPP->chardata);
 318         }
 319         uncomment for more verbosity */
 320
 321         if (!strcasecmp(el, "resource")) {
 322                 if (XMPP->chardata_len > 0) {
 323                         safestrncpy(XMPP->iq_client_resource, XMPP->chardata,
 324                                 sizeof XMPP->iq_client_resource);
 325                         striplt(XMPP->iq_client_resource);
 326                 }
 327         }
 328
 329         else if (!strcasecmp(el, "username")) {         /* NON SASL ONLY */
 330                 if (XMPP->chardata_len > 0) {
 331                         safestrncpy(XMPP->iq_client_username, XMPP->chardata,
 332                                 sizeof XMPP->iq_client_username);
 333                         striplt(XMPP->iq_client_username);
 334                 }
 335         }
 336
 337         else if (!strcasecmp(el, "password")) {         /* NON SASL ONLY */
 338                 if (XMPP->chardata_len > 0) {
 339                         safestrncpy(XMPP->iq_client_password, XMPP->chardata,
 340                                 sizeof XMPP->iq_client_password);
 341                         striplt(XMPP->iq_client_password);
 342                 }
 343         }
 344
 345         else if (!strcasecmp(el, "iq")) {
 346
 347                 /*
 348                  * iq type="get" (handle queries)
 349                  */
 350                 if (!strcasecmp(XMPP->iq_type, "get")) {
 351
 352                         /*
 353                          * Query on a namespace
 354                          */
 355                         if (!IsEmptyStr(XMPP->iq_query_xmlns)) {
 356                                 xmpp_query_namespace(XMPP->iq_id, XMPP->iq_from,
 357                                                 XMPP->iq_to, XMPP->iq_query_xmlns);
 358                         }
 359
 360                         /*
 361                          * ping ( http://xmpp.org/extensions/xep-0199.html )
 362                          */
 363                         else if (XMPP->ping_requested) {
 364                                 cprintf("<iq type=\"result\" ");
 365                                 if (!IsEmptyStr(XMPP->iq_from)) {
 366                                         cprintf("to=\"%s\" ", xmlesc(xmlbuf, XMPP->iq_from, sizeof xmlbuf));
 367                                 }
 368                                 if (!IsEmptyStr(XMPP->iq_to)) {
 369                                         cprintf("from=\"%s\" ", xmlesc(xmlbuf, XMPP->iq_to, sizeof xmlbuf));
 370                                 }
 371                                 cprintf("id=\"%s\"/>", xmlesc(xmlbuf, XMPP->iq_id, sizeof xmlbuf));
 372                         }
 373
 374                         /*
 375                          * Unknown query ... return the XML equivalent of a blank stare
 376                          */
 377                         else {
 378                                 XMPP_syslog(LOG_DEBUG,
 379                                             "Unknown query <%s> - returning <service-unavailable/>\n",
 380                                             el
 381                                 );
 382                                 cprintf("<iq type=\"error\" id=\"%s\">", xmlesc(xmlbuf, XMPP->iq_id, sizeof xmlbuf));
 383                                 cprintf("<error code=\"503\" type=\"cancel\">"
 384                                         "<service-unavailable xmlns=\"urn:ietf:params:xml:ns:xmpp-stanzas\"/>"
 385                                         "</error>"
 386                                 );
 387                                 cprintf("</iq>");
 388                         }
 389                 }
 390
 391                 /*
 392                  * Non SASL authentication
 393                  */
 394                 else if (
 395                         (!strcasecmp(XMPP->iq_type, "set"))
 396                         && (!strcasecmp(XMPP->iq_query_xmlns, "jabber:iq:auth:query"))
 397                         ) {
 398
 399                         xmpp_non_sasl_authenticate(
 400                                 XMPP->iq_id,
 401                                 XMPP->iq_client_username,
 402                                 XMPP->iq_client_password,
 403                                 XMPP->iq_client_resource
 404                         );
 405                 }
 406
 407                 /*
 408                  * If this <iq> stanza was a "bind" attempt, process it ...
 409                  */
 410                 else if (
 411                         (XMPP->bind_requested)
 412                         && (!IsEmptyStr(XMPP->iq_id))
 413                         && (!IsEmptyStr(XMPP->iq_client_resource))
 414                         && (CC->logged_in)
 415                         ) {
 416
 417                         /* Generate the "full JID" of the client resource */
 418
 419                         snprintf(XMPP->client_jid, sizeof XMPP->client_jid,
 420                                 "%s/%s",
 421                                 CC->cs_inet_email,
 422                                 XMPP->iq_client_resource
 423                         );
 424
 425                         /* Tell the client what its JID is */
 426
 427                         cprintf("<iq type=\"result\" id=\"%s\">", xmlesc(xmlbuf, XMPP->iq_id, sizeof xmlbuf));
 428                         cprintf("<bind xmlns=\"urn:ietf:params:xml:ns:xmpp-bind\">");
 429                         cprintf("<jid>%s</jid>", xmlesc(xmlbuf, XMPP->client_jid, sizeof xmlbuf));
 430                         cprintf("</bind>");
 431                         cprintf("</iq>");
 432                 }
 433
 434                 else if (XMPP->iq_session) {
 435                         cprintf("<iq type=\"result\" id=\"%s\">", xmlesc(xmlbuf, XMPP->iq_id, sizeof xmlbuf));
 436                         cprintf("</iq>");
 437                 }
 438
 439                 else {
 440                         cprintf("<iq type=\"error\" id=\"%s\">", xmlesc(xmlbuf, XMPP->iq_id, sizeof xmlbuf));
 441                         cprintf("<error>Don't know howto do '%s'!</error>", xmlesc(xmlbuf, XMPP->iq_type, sizeof xmlbuf));
 442                         cprintf("</iq>");
 443                 }
 444
 445                 /* Now clear these fields out so they don't get used by a future stanza */
 446                 XMPP->iq_id[0] = 0;
 447                 XMPP->iq_from[0] = 0;
 448                 XMPP->iq_to[0] = 0;
 449                 XMPP->iq_type[0] = 0;
 450                 XMPP->iq_client_resource[0] = 0;
 451                 XMPP->iq_session = 0;
 452                 XMPP->iq_query_xmlns[0] = 0;
 453                 XMPP->bind_requested = 0;
 454                 XMPP->ping_requested = 0;
 455         }
 456
 457         else if (!strcasecmp(el, "auth")) {
 458
 459                 /* Try to authenticate (this function is responsible for the output stanza) */
 460                 xmpp_sasl_auth(XMPP->sasl_auth_mech, (XMPP->chardata != NULL ? XMPP->chardata : "") );
 461
 462                 /* Now clear these fields out so they don't get used by a future stanza */
 463                 XMPP->sasl_auth_mech[0] = 0;
 464         }
 465
 466         else if (!strcasecmp(el, "session")) {
 467                 XMPP->iq_session = 1;
 468         }
 469
 470         else if (!strcasecmp(el, "presence")) {
 471
 472                 /* Respond to a <presence> update by firing back with presence information
 473                  * on the entire wholist.  Check this assumption, it's probably wrong.
 474                  */
 475                 xmpp_wholist_presence_dump();
 476         }
 477
 478         else if ( (!strcasecmp(el, "body")) && (XMPP->html_tag_level == 0) ) {
 479                 if (XMPP->message_body != NULL) {
 480                         free(XMPP->message_body);
 481                         XMPP->message_body = NULL;
 482                 }
 483                 if (XMPP->chardata_len > 0) {
 484                         XMPP->message_body = strdup(XMPP->chardata);
 485                 }
 486         }
 487
 488         else if (!strcasecmp(el, "message")) {
 489                 xmpp_send_message(XMPP->message_to, XMPP->message_body);
 490                 XMPP->html_tag_level = 0;
 491         }
 492
 493         else if (!strcasecmp(el, "html")) {
 494                 --XMPP->html_tag_level;
 495         }
 496
 497         else if (!strcasecmp(el, "starttls")) {
 498 #ifdef HAVE_OPENSSL
 499                 cprintf("<proceed xmlns='urn:ietf:params:xml:ns:xmpp-tls'/>");
 500                 CtdlModuleStartCryptoMsgs(NULL, NULL, NULL);
 501                 if (!CC->redirect_ssl) CC->kill_me = KILLME_NO_CRYPTO;
 502 #else
 503                 cprintf("<failure xmlns='urn:ietf:params:xml:ns:xmpp-tls'/>");
 504                 CC->kill_me = KILLME_NO_CRYPTO;
 505 #endif
 506         }
 507
 508         else if (!strcasecmp(el, "ping")) {
 509                 XMPP->ping_requested = 1;
 510         }
 511
 512         else if (!strcasecmp(el, "stream")) {
 513                 XMPPM_syslog(LOG_DEBUG, "XMPP client shut down their stream\n");
 514                 xmpp_massacre_roster();
 515                 cprintf("</stream>\n");
 516                 CC->kill_me = KILLME_CLIENT_LOGGED_OUT;
 517         }
 518
 519         else if (!strcasecmp(el, "query")) {
 520                 /* already processed , no further action needed here */
 521         }
 522
 523         else if (!strcasecmp(el, "bind")) {
 524                 /* already processed , no further action needed here */
 525         }
 526
 527         else {
 528                 XMPP_syslog(LOG_DEBUG, "Ignoring unknown tag <%s>\n", el);
 529         }
 530
 531         XMPP->chardata_len = 0;
 532         if (XMPP->chardata_alloc > 0) {
 533                 XMPP->chardata[0] = 0;
 534         }
 535 }
 536
 537
 538 void xmpp_xml_chardata(void *data, const XML_Char *s, int len)
 539 {
 540         citxmpp *X = XMPP;
 541
 542         if (X->chardata_alloc == 0) {
 543                 X->chardata_alloc = SIZ;
 544                 X->chardata = malloc(X->chardata_alloc);
 545         }
 546         if ((X->chardata_len + len + 1) > X->chardata_alloc) {
 547                 X->chardata_alloc = X->chardata_len + len + 1024;
 548                 X->chardata = realloc(X->chardata, X->chardata_alloc);
 549         }
 550         memcpy(&X->chardata[X->chardata_len], s, len);
 551         X->chardata_len += len;
 552         X->chardata[X->chardata_len] = 0;
 553 }
 554
 555
 556 /*
 557  * This cleanup function blows away the temporary memory and files used by the XMPP service.
 558  */
 559 void xmpp_cleanup_function(void) {
 560
 561         /* Don't do this stuff if this is not a XMPP session! */
 562         if (CC->h_command_function != xmpp_command_loop) return;
 563
 564         if (XMPP->chardata != NULL) {
 565                 free(XMPP->chardata);
 566                 XMPP->chardata = NULL;
 567                 XMPP->chardata_len = 0;
 568                 XMPP->chardata_alloc = 0;
 569                 if (XMPP->message_body != NULL) {
 570                         free(XMPP->message_body);
 571                 }
 572         }
 573         XML_ParserFree(XMPP->xp);
 574         free(XMPP);
 575 }
 576
 577
 578
 579 /*
 580  * Here's where our XMPP session begins its happy day.
 581  */
 582 void xmpp_greeting(void) {
 583         client_set_inbound_buf(4);
 584         strcpy(CC->cs_clientname, "XMPP session");
 585         CC->session_specific_data = malloc(sizeof(citxmpp));
 586         memset(XMPP, 0, sizeof(citxmpp));
 587         XMPP->last_event_processed = queue_event_seq;
 588
 589         /* XMPP does not use a greeting, but we still have to initialize some things. */
 590
 591         XMPP->xp = XML_ParserCreateNS("UTF-8", ':');
 592         if (XMPP->xp == NULL) {
 593                 XMPPM_syslog(LOG_ALERT, "Cannot create XML parser!\n");
 594                 CC->kill_me = KILLME_XML_PARSER;
 595                 return;
 596         }
 597
 598         XML_SetElementHandler(XMPP->xp, xmpp_xml_start, xmpp_xml_end);
 599         XML_SetCharacterDataHandler(XMPP->xp, xmpp_xml_chardata);
 600         // XML_SetUserData(XMPP->xp, something...);
 601
 602         /* Prevent the "billion laughs" attack against expat by disabling
 603          * internal entity expansion.  With 2.x, forcibly stop the parser
 604          * if an entity is declared - this is safer and a more obvious
 605          * failure mode.  With older versions, simply prevent expansion
 606          * of such entities. */
 607 #ifdef HAVE_XML_STOPPARSER
 608         XML_SetEntityDeclHandler(XMPP->xp, xmpp_entity_declaration);
 609 #else
 610         XML_SetDefaultHandler(XMPP->xp, NULL);
 611 #endif
 612
 613         CC->can_receive_im = 1;         /* This protocol is capable of receiving instant messages */
 614 }
 615
 616
 617 /*
 618  * Main command loop for XMPP sessions.
 619  */
 620 void xmpp_command_loop(void) {
 621         int rc;
 622         StrBuf *stream_input = NewStrBuf();
 623
 624         time(&CC->lastcmd);
 625         rc = client_read_random_blob(stream_input, 30);
 626         if (rc > 0) {
 627                 XML_Parse(XMPP->xp, ChrPtr(stream_input), rc, 0);
 628         }
 629         else {
 630                 XMPPM_syslog(LOG_ERR, "client disconnected: ending session.\n");
 631                 CC->kill_me = KILLME_CLIENT_DISCONNECTED;
 632         }
 633         FreeStrBuf(&stream_input);
 634 }
 635
 636
 637 /*
 638  * Async loop for XMPP sessions (handles the transmission of unsolicited stanzas)
 639  */
 640 void xmpp_async_loop(void) {
 641         xmpp_process_events();
 642         xmpp_output_incoming_messages();
 643 }
 644
 645
 646 /*
 647  * Login hook for XMPP sessions
 648  */
 649 void xmpp_login_hook(void) {
 650         xmpp_queue_event(XMPP_EVT_LOGIN, CC->cs_inet_email);
 651 }
 652
 653
 654 /*
 655  * Logout hook for XMPP sessions
 656  */
 657 void xmpp_logout_hook(void) {
 658         xmpp_queue_event(XMPP_EVT_LOGOUT, CC->cs_inet_email);
 659 }
 660
 661
 662 void LogXMPPSrvDebugEnable(const int n)
 663 {
 664         XMPPSrvDebugEnable = n;
 665 }
 666 const char *CitadelServiceXMPP="XMPP";
 667 extern void xmpp_cleanup_events(void);
 668 CTDL_MODULE_INIT(xmpp)
 669 {
 670         if (!threading) {
 671                 CtdlRegisterServiceHook(CtdlGetConfigInt("c_xmpp_c2s_port"),
 672                                         NULL,
 673                                         xmpp_greeting,
 674                                         xmpp_command_loop,
 675                                         xmpp_async_loop,
 676                                         CitadelServiceXMPP
 677                 );
 678                 CtdlRegisterDebugFlagHook(HKEY("serv_xmpp"), LogXMPPSrvDebugEnable, &XMPPSrvDebugEnable);
 679                 CtdlRegisterSessionHook(xmpp_cleanup_function, EVT_STOP, PRIO_STOP + 70);
 680                 CtdlRegisterSessionHook(xmpp_login_hook, EVT_LOGIN, PRIO_LOGIN + 90);
 681                 CtdlRegisterSessionHook(xmpp_logout_hook, EVT_LOGOUT, PRIO_LOGOUT + 90);
 682                 CtdlRegisterSessionHook(xmpp_login_hook, EVT_UNSTEALTH, PRIO_UNSTEALTH + 1);
 683                 CtdlRegisterSessionHook(xmpp_logout_hook, EVT_STEALTH, PRIO_STEALTH + 1);
 684                 CtdlRegisterCleanupHook(xmpp_cleanup_events);
 685
 686         }
 687
 688         /* return our module name for the log */
 689         return "xmpp";
 690 }