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 // uncomment for more verbosity
  21 #define XMPP_DEBUG 1
  22
  23 #include "sysdep.h"
  24 #include <stdlib.h>
  25 #include <unistd.h>
  26 #include <stdio.h>
  27 #include <fcntl.h>
  28 #include <signal.h>
  29 #include <pwd.h>
  30 #include <errno.h>
  31 #include <sys/types.h>
  32
  33 #if TIME_WITH_SYS_TIME
  34 # include <sys/time.h>
  35 # include <time.h>
  36 #else
  37 # if HAVE_SYS_TIME_H
  38 #  include <sys/time.h>
  39 # else
  40 #  include <time.h>
  41 # endif
  42 #endif
  43
  44 #include <sys/wait.h>
  45 #include <string.h>
  46 #include <limits.h>
  47 #include <ctype.h>
  48 #include <libcitadel.h>
  49 #include <expat.h>
  50 #include "citadel.h"
  51 #include "server.h"
  52 #include "citserver.h"
  53 #include "support.h"
  54 #include "config.h"
  55 #include "user_ops.h"
  56 #include "database.h"
  57 #include "msgbase.h"
  58 #include "internet_addressing.h"
  59 #include "md5.h"
  60 #include "ctdl_module.h"
  61 #include "serv_xmpp.h"
  62
  63 /* XML_StopParser is present in expat 2.x */
  64 #if XML_MAJOR_VERSION > 1
  65 #define HAVE_XML_STOPPARSER
  66 #endif
  67
  68 struct xmpp_event *xmpp_queue = NULL;
  69
  70 int XMPPSrvDebugEnable = 0;
  71
  72
  73
  74 #ifdef HAVE_XML_STOPPARSER
  75 /* Stop the parser if an entity declaration is hit. */
  76 static void xmpp_entity_declaration(void *userData, const XML_Char *entityName,
  77                                 int is_parameter_entity, const XML_Char *value,
  78                                 int value_length, const XML_Char *base,
  79                                 const XML_Char *systemId, const XML_Char *publicId,
  80                                 const XML_Char *notationName
  81 ) {
  82         syslog(LOG_WARNING, "Illegal entity declaration encountered; stopping parser.");
  83         XML_StopParser(XMPP->xp, XML_FALSE);
  84 }
  85 #endif
  86
  87 static inline int XMPP_GetUtf8SequenceLength(const char *CharS, const char *CharE)
  88 {
  89         /* if this is is migrated to strbuf, remove this copy. */
  90         int n = 0;
  91         unsigned char test = (1<<7);
  92
  93         if ((*CharS & 0xC0) != 0xC0)
  94                 return 1;
  95
  96         while ((n < 8) &&
  97                ((test & ((unsigned char)*CharS)) != 0))
  98         {
  99                 test = test >> 1;
 100                 n ++;
 101         }
 102         if ((n > 6) || ((CharE - CharS) < n))
 103                 n = 0;
 104         return n;
 105 }
 106
 107
 108 /*
 109  * Given a source string and a target buffer, returns the string
 110  * properly escaped for insertion into an XML stream.  Returns a
 111  * pointer to the target buffer for convenience.
 112  *
 113  * BUG: this does not properly handle UTF-8
 114  */
 115 char *xmlesc(char *buf, char *str, int bufsiz)
 116 {
 117         char *ptr;
 118         char *eiptr;
 119         unsigned char ch;
 120         int inlen;
 121         int len = 0;
 122         int IsUtf8Sequence;
 123
 124         if (!buf) return(NULL);
 125         buf[0] = 0;
 126         len = 0;
 127         if (!str) {
 128                 return(buf);
 129         }
 130
 131         inlen = strlen(str);
 132         eiptr = str + inlen;
 133
 134         for (ptr=str; *ptr; ptr++) {
 135                 ch = *ptr;
 136                 if (ch == '<') {
 137                         strcpy(&buf[len], "&lt;");
 138                         len += 4;
 139                 }
 140                 else if (ch == '>') {
 141                         strcpy(&buf[len], "&gt;");
 142                         len += 4;
 143                 }
 144                 else if (ch == '&') {
 145                         strcpy(&buf[len], "&amp;");
 146                         len += 5;
 147                 }
 148                 else if ((ch >= 0x20) && (ch <= 0x7F)) {
 149                         buf[len++] = ch;
 150                         buf[len] = 0;
 151                 }
 152                 else if (ch < 0x20) {
 153                         /* we probably shouldn't be doing this */
 154                         buf[len++] = '_';
 155                         buf[len] = 0;
 156                 }
 157                 else {
 158                         char oct[32];
 159
 160                         IsUtf8Sequence =  XMPP_GetUtf8SequenceLength(&buf[len], eiptr);
 161                         if (IsUtf8Sequence)
 162                         {
 163                                 while (IsUtf8Sequence > 0){
 164                                         buf[len] = *ptr;
 165                                         len ++;
 166                                         if (--IsUtf8Sequence)
 167                                                 ptr++;
 168                                 }
 169                                 buf[len] = '\0';
 170                         }
 171                         else
 172                         {
 173                                 sprintf(oct, "&#%o;", ch);
 174                                 strcpy(&buf[len], oct);
 175                                 len += strlen(oct);
 176                         }
 177                 }
 178                 if ((len + 6) > bufsiz) {
 179                         return(buf);
 180                 }
 181         }
 182         return(buf);
 183 }
 184
 185
 186 /*
 187  * We have just received a <stream> tag from the client, so send them ours
 188  */
 189 void xmpp_stream_start(void *data, const char *supplied_el, const char **attr)
 190 {
 191         char xmlbuf[256];
 192
 193         while (*attr) {
 194                 if (!strcasecmp(attr[0], "to")) {
 195                         safestrncpy(XMPP->server_name, attr[1], sizeof XMPP->server_name);
 196                 }
 197                 attr += 2;
 198         }
 199
 200         cprintf("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
 201
 202         cprintf("<stream:stream ");
 203         cprintf("from=\"%s\" ", xmlesc(xmlbuf, XMPP->server_name, sizeof xmlbuf));
 204         cprintf("id=\"%08x\" ", CC->cs_pid);
 205         cprintf("version=\"1.0\" ");
 206         cprintf("xmlns:stream=\"http://etherx.jabber.org/streams\" ");
 207         cprintf("xmlns=\"jabber:client\">");
 208
 209         /* The features of this stream are... */
 210         cprintf("<stream:features>");
 211
 212         /*
 213          * TLS encryption (but only if it isn't already active)
 214          */
 215 #ifdef HAVE_OPENSSL
 216         if (!CC->redirect_ssl) {
 217                 cprintf("<starttls xmlns='urn:ietf:params:xml:ns:xmpp-tls'></starttls>");
 218         }
 219 #endif
 220
 221         if (!CC->logged_in) {
 222                 /* If we're not logged in yet, offer SASL as our feature set */
 223                 xmpp_output_auth_mechs();
 224
 225                 /* Also offer non-SASL authentication */
 226                 cprintf("<auth xmlns=\"http://jabber.org/features/iq-auth\"/>");
 227         }
 228
 229         /* Offer binding and sessions as part of our feature set */
 230         cprintf("<bind xmlns=\"urn:ietf:params:xml:ns:xmpp-bind\"/>");
 231         cprintf("<session xmlns=\"urn:ietf:params:xml:ns:xmpp-session\"/>");
 232
 233         cprintf("</stream:features>");
 234
 235         CC->is_async = 1;               /* XMPP sessions are inherently async-capable */
 236 }
 237
 238
 239 void xmpp_xml_start(void *data, const char *supplied_el, const char **attr) {
 240         char el[256];
 241         char *sep = NULL;
 242         int i;
 243
 244         /* Axe the namespace, we don't care about it */
 245         safestrncpy(el, supplied_el, sizeof el);
 246         while (sep = strchr(el, ':'), sep) {
 247                 strcpy(el, ++sep);
 248         }
 249
 250 #ifdef XMPP_DEBUG
 251         syslog(LOG_DEBUG, "XMPP ELEMENT START: <%s>\n", el);
 252         for (i=0; attr[i] != NULL; i+=2) {
 253                 syslog(LOG_DEBUG, "                    Attribute '%s' = '%s'\n", attr[i], attr[i+1]);
 254         }
 255 #endif /* XMPP_DEBUG */
 256
 257         if (!strcasecmp(el, "stream")) {
 258                 xmpp_stream_start(data, supplied_el, attr);
 259         }
 260
 261         else if (!strcasecmp(el, "query")) {
 262                 XMPP->iq_query_xmlns[0] = 0;
 263                 safestrncpy(XMPP->iq_query_xmlns, supplied_el, sizeof XMPP->iq_query_xmlns);
 264         }
 265
 266         else if (!strcasecmp(el, "bind")) {
 267                 XMPP->bind_requested = 1;
 268         }
 269
 270         else if (!strcasecmp(el, "iq")) {
 271                 for (i=0; attr[i] != NULL; i+=2) {
 272                         if (!strcasecmp(attr[i], "type")) {
 273                                 safestrncpy(XMPP->iq_type, attr[i+1], sizeof XMPP->iq_type);
 274                         }
 275                         else if (!strcasecmp(attr[i], "id")) {
 276                                 safestrncpy(XMPP->iq_id, attr[i+1], sizeof XMPP->iq_id);
 277                         }
 278                         else if (!strcasecmp(attr[i], "from")) {
 279                                 safestrncpy(XMPP->iq_from, attr[i+1], sizeof XMPP->iq_from);
 280                         }
 281                         else if (!strcasecmp(attr[i], "to")) {
 282                                 safestrncpy(XMPP->iq_to, attr[i+1], sizeof XMPP->iq_to);
 283                         }
 284                 }
 285         }
 286
 287         else if (!strcasecmp(el, "auth")) {
 288                 XMPP->sasl_auth_mech[0] = 0;
 289                 for (i=0; attr[i] != NULL; i+=2) {
 290                         if (!strcasecmp(attr[i], "mechanism")) {
 291                                 safestrncpy(XMPP->sasl_auth_mech, attr[i+1], sizeof XMPP->sasl_auth_mech);
 292                         }
 293                 }
 294         }
 295
 296         else if (!strcasecmp(el, "message")) {
 297                 for (i=0; attr[i] != NULL; i+=2) {
 298                         if (!strcasecmp(attr[i], "to")) {
 299                                 safestrncpy(XMPP->message_to, attr[i+1], sizeof XMPP->message_to);
 300                         }
 301                 }
 302         }
 303
 304         else if (!strcasecmp(el, "html")) {
 305                 ++XMPP->html_tag_level;
 306         }
 307 }
 308
 309
 310
 311 void xmpp_xml_end(void *data, const char *supplied_el) {
 312         char el[256];
 313         char *sep = NULL;
 314         char xmlbuf[256];
 315
 316         /* Axe the namespace, we don't care about it */
 317         safestrncpy(el, supplied_el, sizeof el);
 318         while (sep = strchr(el, ':'), sep) {
 319                 strcpy(el, ++sep);
 320         }
 321
 322 #ifdef XMPP_DEBUG
 323         syslog(LOG_DEBUG, "XMPP ELEMENT END  : <%s>\n", el);
 324         if (XMPP->chardata_len > 0) {
 325                 syslog(LOG_DEBUG, "          chardata: %s\n", XMPP->chardata);
 326         }
 327 #endif /* XMPP_DEBUG */
 328
 329         if (!strcasecmp(el, "resource")) {
 330                 if (XMPP->chardata_len > 0) {
 331                         safestrncpy(XMPP->iq_client_resource, XMPP->chardata,
 332                                 sizeof XMPP->iq_client_resource);
 333                         striplt(XMPP->iq_client_resource);
 334                 }
 335         }
 336
 337         else if (!strcasecmp(el, "username")) {         /* NON SASL ONLY */
 338                 if (XMPP->chardata_len > 0) {
 339                         safestrncpy(XMPP->iq_client_username, XMPP->chardata,
 340                                 sizeof XMPP->iq_client_username);
 341                         striplt(XMPP->iq_client_username);
 342                 }
 343         }
 344
 345         else if (!strcasecmp(el, "password")) {         /* NON SASL ONLY */
 346                 if (XMPP->chardata_len > 0) {
 347                         safestrncpy(XMPP->iq_client_password, XMPP->chardata,
 348                                 sizeof XMPP->iq_client_password);
 349                         striplt(XMPP->iq_client_password);
 350                 }
 351         }
 352
 353         else if (!strcasecmp(el, "iq")) {
 354
 355                 /*
 356                  * iq type="get" (handle queries)
 357                  */
 358                 if (!strcasecmp(XMPP->iq_type, "get")) {
 359
 360                         /*
 361                          * Query on a namespace
 362                          */
 363                         if (!IsEmptyStr(XMPP->iq_query_xmlns)) {
 364                                 xmpp_query_namespace(XMPP->iq_id, XMPP->iq_from,
 365                                                 XMPP->iq_to, XMPP->iq_query_xmlns);
 366                         }
 367
 368                         /*
 369                          * ping ( http://xmpp.org/extensions/xep-0199.html )
 370                          */
 371                         else if (XMPP->ping_requested) {
 372                                 cprintf("<iq type=\"result\" ");
 373                                 if (!IsEmptyStr(XMPP->iq_from)) {
 374                                         cprintf("to=\"%s\" ", xmlesc(xmlbuf, XMPP->iq_from, sizeof xmlbuf));
 375                                 }
 376                                 if (!IsEmptyStr(XMPP->iq_to)) {
 377                                         cprintf("from=\"%s\" ", xmlesc(xmlbuf, XMPP->iq_to, sizeof xmlbuf));
 378                                 }
 379                                 cprintf("id=\"%s\"/>", xmlesc(xmlbuf, XMPP->iq_id, sizeof xmlbuf));
 380                         }
 381
 382                         /*
 383                          * Unknown query ... return the XML equivalent of a blank stare
 384                          */
 385                         else {
 386                                 syslog(LOG_DEBUG,
 387                                             "Unknown query <%s> - returning <service-unavailable/>\n",
 388                                             el
 389                                 );
 390                                 cprintf("<iq type=\"error\" id=\"%s\">", xmlesc(xmlbuf, XMPP->iq_id, sizeof xmlbuf));
 391                                 cprintf("<error code=\"503\" type=\"cancel\">"
 392                                         "<service-unavailable xmlns=\"urn:ietf:params:xml:ns:xmpp-stanzas\"/>"
 393                                         "</error>"
 394                                 );
 395                                 cprintf("</iq>");
 396                         }
 397                 }
 398
 399                 /*
 400                  * Non SASL authentication
 401                  */
 402                 else if (
 403                         (!strcasecmp(XMPP->iq_type, "set"))
 404                         && (!strcasecmp(XMPP->iq_query_xmlns, "jabber:iq:auth:query"))
 405                         ) {
 406
 407                         xmpp_non_sasl_authenticate(
 408                                 XMPP->iq_id,
 409                                 XMPP->iq_client_username,
 410                                 XMPP->iq_client_password,
 411                                 XMPP->iq_client_resource
 412                         );
 413                 }
 414
 415                 /*
 416                  * If this <iq> stanza was a "bind" attempt, process it ...
 417                  */
 418                 else if (
 419                         (XMPP->bind_requested)
 420                         && (!IsEmptyStr(XMPP->iq_id))
 421                         && (!IsEmptyStr(XMPP->iq_client_resource))
 422                         && (CC->logged_in)
 423                         ) {
 424
 425                         /* Generate the "full JID" of the client resource */
 426
 427                         snprintf(XMPP->client_jid, sizeof XMPP->client_jid,
 428                                 "%s/%s",
 429                                 CC->cs_inet_email,
 430                                 XMPP->iq_client_resource
 431                         );
 432
 433                         /* Tell the client what its JID is */
 434
 435                         cprintf("<iq type=\"result\" id=\"%s\">", xmlesc(xmlbuf, XMPP->iq_id, sizeof xmlbuf));
 436                         cprintf("<bind xmlns=\"urn:ietf:params:xml:ns:xmpp-bind\">");
 437                         cprintf("<jid>%s</jid>", xmlesc(xmlbuf, XMPP->client_jid, sizeof xmlbuf));
 438                         cprintf("</bind>");
 439                         cprintf("</iq>");
 440                 }
 441
 442                 else if (XMPP->iq_session) {
 443                         cprintf("<iq type=\"result\" id=\"%s\">", xmlesc(xmlbuf, XMPP->iq_id, sizeof xmlbuf));
 444                         cprintf("</iq>");
 445                 }
 446
 447                 else {
 448                         cprintf("<iq type=\"error\" id=\"%s\">", xmlesc(xmlbuf, XMPP->iq_id, sizeof xmlbuf));
 449                         cprintf("<error>Don't know howto do '%s'!</error>", xmlesc(xmlbuf, XMPP->iq_type, sizeof xmlbuf));
 450                         cprintf("</iq>");
 451                 }
 452
 453                 /* Now clear these fields out so they don't get used by a future stanza */
 454                 XMPP->iq_id[0] = 0;
 455                 XMPP->iq_from[0] = 0;
 456                 XMPP->iq_to[0] = 0;
 457                 XMPP->iq_type[0] = 0;
 458                 XMPP->iq_client_resource[0] = 0;
 459                 XMPP->iq_session = 0;
 460                 XMPP->iq_query_xmlns[0] = 0;
 461                 XMPP->bind_requested = 0;
 462                 XMPP->ping_requested = 0;
 463         }
 464
 465         else if (!strcasecmp(el, "auth")) {
 466
 467                 /* Try to authenticate (this function is responsible for the output stanza) */
 468                 xmpp_sasl_auth(XMPP->sasl_auth_mech, (XMPP->chardata != NULL ? XMPP->chardata : "") );
 469
 470                 /* Now clear these fields out so they don't get used by a future stanza */
 471                 XMPP->sasl_auth_mech[0] = 0;
 472         }
 473
 474         else if (!strcasecmp(el, "session")) {
 475                 XMPP->iq_session = 1;
 476         }
 477
 478         else if (!strcasecmp(el, "presence")) {
 479
 480                 /* Respond to a <presence> update by firing back with presence information
 481                  * on the entire wholist.  Check this assumption, it's probably wrong.
 482                  */
 483                 xmpp_wholist_presence_dump();
 484         }
 485
 486         else if ( (!strcasecmp(el, "body")) && (XMPP->html_tag_level == 0) ) {
 487                 if (XMPP->message_body != NULL) {
 488                         free(XMPP->message_body);
 489                         XMPP->message_body = NULL;
 490                 }
 491                 if (XMPP->chardata_len > 0) {
 492                         XMPP->message_body = strdup(XMPP->chardata);
 493                 }
 494         }
 495
 496         else if (!strcasecmp(el, "message")) {
 497                 xmpp_send_message(XMPP->message_to, XMPP->message_body);
 498                 XMPP->html_tag_level = 0;
 499         }
 500
 501         else if (!strcasecmp(el, "html")) {
 502                 --XMPP->html_tag_level;
 503         }
 504
 505         else if (!strcasecmp(el, "starttls")) {
 506 #ifdef HAVE_OPENSSL
 507                 cprintf("<proceed xmlns='urn:ietf:params:xml:ns:xmpp-tls'/>");
 508                 CtdlModuleStartCryptoMsgs(NULL, NULL, NULL);
 509                 if (!CC->redirect_ssl) CC->kill_me = KILLME_NO_CRYPTO;
 510 #else
 511                 cprintf("<failure xmlns='urn:ietf:params:xml:ns:xmpp-tls'/>");
 512                 CC->kill_me = KILLME_NO_CRYPTO;
 513 #endif
 514         }
 515
 516         else if (!strcasecmp(el, "ping")) {
 517                 XMPP->ping_requested = 1;
 518         }
 519
 520         else if (!strcasecmp(el, "stream")) {
 521                 syslog(LOG_DEBUG, "XMPP client shut down their stream\n");
 522                 xmpp_massacre_roster();
 523                 cprintf("</stream>\n");
 524                 CC->kill_me = KILLME_CLIENT_LOGGED_OUT;
 525         }
 526
 527         else if (!strcasecmp(el, "query")) {
 528                 // no action required here, we picked up the xmlns= parameter during xmpp_xml_start()
 529         }
 530
 531         else {
 532                 syslog(LOG_DEBUG, "Ignoring unknown tag <%s>\n", el);
 533         }
 534
 535         XMPP->chardata_len = 0;
 536         if (XMPP->chardata_alloc > 0) {
 537                 XMPP->chardata[0] = 0;
 538         }
 539 }
 540
 541
 542 void xmpp_xml_chardata(void *data, const XML_Char *s, int len)
 543 {
 544         citxmpp *X = XMPP;
 545
 546         if (X->chardata_alloc == 0) {
 547                 X->chardata_alloc = SIZ;
 548                 X->chardata = malloc(X->chardata_alloc);
 549         }
 550         if ((X->chardata_len + len + 1) > X->chardata_alloc) {
 551                 X->chardata_alloc = X->chardata_len + len + 1024;
 552                 X->chardata = realloc(X->chardata, X->chardata_alloc);
 553         }
 554         memcpy(&X->chardata[X->chardata_len], s, len);
 555         X->chardata_len += len;
 556         X->chardata[X->chardata_len] = 0;
 557 }
 558
 559
 560 /*
 561  * This cleanup function blows away the temporary memory and files used by the XMPP service.
 562  */
 563 void xmpp_cleanup_function(void) {
 564
 565         /* Don't do this stuff if this is not a XMPP session! */
 566         if (CC->h_command_function != xmpp_command_loop) return;
 567
 568         if (XMPP->chardata != NULL) {
 569                 free(XMPP->chardata);
 570                 XMPP->chardata = NULL;
 571                 XMPP->chardata_len = 0;
 572                 XMPP->chardata_alloc = 0;
 573                 if (XMPP->message_body != NULL) {
 574                         free(XMPP->message_body);
 575                 }
 576         }
 577         XML_ParserFree(XMPP->xp);
 578         free(XMPP);
 579 }
 580
 581
 582
 583 /*
 584  * Here's where our XMPP session begins its happy day.
 585  */
 586 void xmpp_greeting(void) {
 587         client_set_inbound_buf(4);
 588         strcpy(CC->cs_clientname, "XMPP session");
 589         CC->session_specific_data = malloc(sizeof(citxmpp));
 590         memset(XMPP, 0, sizeof(citxmpp));
 591         XMPP->last_event_processed = queue_event_seq;
 592
 593         /* XMPP does not use a greeting, but we still have to initialize some things. */
 594
 595         XMPP->xp = XML_ParserCreateNS("UTF-8", ':');
 596         if (XMPP->xp == NULL) {
 597                 syslog(LOG_ALERT, "Cannot create XML parser!\n");
 598                 CC->kill_me = KILLME_XML_PARSER;
 599                 return;
 600         }
 601
 602         XML_SetElementHandler(XMPP->xp, xmpp_xml_start, xmpp_xml_end);
 603         XML_SetCharacterDataHandler(XMPP->xp, xmpp_xml_chardata);
 604         // XML_SetUserData(XMPP->xp, something...);
 605
 606         /* Prevent the "billion laughs" attack against expat by disabling
 607          * internal entity expansion.  With 2.x, forcibly stop the parser
 608          * if an entity is declared - this is safer and a more obvious
 609          * failure mode.  With older versions, simply prevent expansion
 610          * of such entities. */
 611 #ifdef HAVE_XML_STOPPARSER
 612         XML_SetEntityDeclHandler(XMPP->xp, xmpp_entity_declaration);
 613 #else
 614         XML_SetDefaultHandler(XMPP->xp, NULL);
 615 #endif
 616
 617         CC->can_receive_im = 1;         /* This protocol is capable of receiving instant messages */
 618 }
 619
 620
 621 /*
 622  * Main command loop for XMPP sessions.
 623  */
 624 void xmpp_command_loop(void) {
 625         int rc;
 626         StrBuf *stream_input = NewStrBuf();
 627
 628         time(&CC->lastcmd);
 629         rc = client_read_random_blob(stream_input, 30);
 630         if (rc > 0) {
 631                 syslog(LOG_DEBUG, "\033[32m%s\033[0m", ChrPtr(stream_input));
 632                 XML_Parse(XMPP->xp, ChrPtr(stream_input), rc, 0);
 633         }
 634         else {
 635                 syslog(LOG_ERR, "client disconnected: ending session.\n");
 636                 CC->kill_me = KILLME_CLIENT_DISCONNECTED;
 637         }
 638         FreeStrBuf(&stream_input);
 639 }
 640
 641
 642 /*
 643  * Async loop for XMPP sessions (handles the transmission of unsolicited stanzas)
 644  */
 645 void xmpp_async_loop(void) {
 646         xmpp_process_events();
 647         xmpp_output_incoming_messages();
 648 }
 649
 650
 651 /*
 652  * Login hook for XMPP sessions
 653  */
 654 void xmpp_login_hook(void) {
 655         xmpp_queue_event(XMPP_EVT_LOGIN, CC->cs_inet_email);
 656 }
 657
 658
 659 /*
 660  * Logout hook for XMPP sessions
 661  */
 662 void xmpp_logout_hook(void) {
 663         xmpp_queue_event(XMPP_EVT_LOGOUT, CC->cs_inet_email);
 664 }
 665
 666
 667 void LogXMPPSrvDebugEnable(const int n)
 668 {
 669         XMPPSrvDebugEnable = n;
 670 }
 671 const char *CitadelServiceXMPP="XMPP";
 672 extern void xmpp_cleanup_events(void);
 673 CTDL_MODULE_INIT(xmpp)
 674 {
 675         if (!threading) {
 676                 CtdlRegisterServiceHook(config.c_xmpp_c2s_port,
 677                                         NULL,
 678                                         xmpp_greeting,
 679                                         xmpp_command_loop,
 680                                         xmpp_async_loop,
 681                                         CitadelServiceXMPP
 682                 );
 683                 CtdlRegisterDebugFlagHook(HKEY("serv_xmpp"), LogXMPPSrvDebugEnable, &XMPPSrvDebugEnable);
 684                 CtdlRegisterSessionHook(xmpp_cleanup_function, EVT_STOP, PRIO_STOP + 70);
 685                 CtdlRegisterSessionHook(xmpp_login_hook, EVT_LOGIN, PRIO_LOGIN + 90);
 686                 CtdlRegisterSessionHook(xmpp_logout_hook, EVT_LOGOUT, PRIO_LOGOUT + 90);
 687                 CtdlRegisterSessionHook(xmpp_login_hook, EVT_UNSTEALTH, PRIO_UNSTEALTH + 1);
 688                 CtdlRegisterSessionHook(xmpp_logout_hook, EVT_STEALTH, PRIO_STEALTH + 1);
 689                 CtdlRegisterCleanupHook(xmpp_cleanup_events);
 690
 691         }
 692
 693         /* return our module name for the log */
 694         return "xmpp";
 695 }