citadel/modules/xmpp/serv_xmpp.c

   1 /*
   2  * XMPP (Jabber) service for the Citadel system
   3  * Copyright (c) 2007-2018 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 /* uncomment for more verbosity - it will log all received XML tags */
  61 #define XMPP_XML_DEBUG
  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
  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         syslog(LOG_WARNING, "xmpp: illegal entity declaration encountered; stopping parser.");
  80         XML_StopParser(XMPP->xp, XML_FALSE);
  81 }
  82 #endif
  83
  84
  85 /*
  86  * Given a source string and a target buffer, returns the string
  87  * properly escaped for insertion into an XML stream.  Returns a
  88  * pointer to the target buffer for convenience.
  89  */
  90 static inline int Ctdl_GetUtf8SequenceLength(const char *CharS, const char *CharE)
  91 {
  92         int n = 0;
  93         unsigned char test = (1<<7);
  94
  95         if ((*CharS & 0xC0) != 0xC0)
  96                 return 1;
  97
  98         while ((n < 8) &&
  99                ((test & ((unsigned char)*CharS)) != 0))
 100         {
 101                 test = test >> 1;
 102                 n ++;
 103         }
 104         if ((n > 6) || ((CharE - CharS) < n))
 105                 n = 0;
 106         return n;
 107 }
 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 #ifdef XMPP_XML_DEBUG
 243         syslog(LOG_DEBUG, "xmpp: ELEMENT START: <%s>", el);
 244         for (i=0; attr[i] != NULL; i+=2) {
 245                 syslog(LOG_DEBUG, "xmpp: Attribute '%s' = '%s'", attr[i], attr[i+1]);
 246         }
 247 #endif
 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 #ifdef XMPP_XML_DEBUG
 315         syslog(LOG_DEBUG, "xmpp: ELEMENT END  : <%s>", el);
 316         if (XMPP->chardata_len > 0) {
 317                 syslog(LOG_DEBUG, "xmpp: chardata: %s", XMPP->chardata);
 318         }
 319 #endif
 320
 321         if (!strcasecmp(el, "resource")) {
 322                 if (XMPP->chardata_len > 0) {
 323                         safestrncpy(XMPP->iq_client_resource, XMPP->chardata, sizeof XMPP->iq_client_resource);
 324                         striplt(XMPP->iq_client_resource);
 325                 }
 326         }
 327
 328         else if (!strcasecmp(el, "username")) {         /* NON SASL ONLY */
 329                 if (XMPP->chardata_len > 0) {
 330                         safestrncpy(XMPP->iq_client_username, XMPP->chardata, sizeof XMPP->iq_client_username);
 331                         striplt(XMPP->iq_client_username);
 332                 }
 333         }
 334
 335         else if (!strcasecmp(el, "password")) {         /* NON SASL ONLY */
 336                 if (XMPP->chardata_len > 0) {
 337                         safestrncpy(XMPP->iq_client_password, XMPP->chardata, sizeof XMPP->iq_client_password);
 338                         striplt(XMPP->iq_client_password);
 339                 }
 340         }
 341
 342         else if (!strcasecmp(el, "iq")) {
 343
 344                 /*
 345                  * iq type="get" (handle queries)
 346                  */
 347                 if (!strcasecmp(XMPP->iq_type, "get")) {
 348
 349                         /*
 350                          * Query on a namespace
 351                          */
 352                         if (!IsEmptyStr(XMPP->iq_query_xmlns)) {
 353                                 xmpp_query_namespace(XMPP->iq_id, XMPP->iq_from, XMPP->iq_to, XMPP->iq_query_xmlns);
 354                         }
 355
 356                         /*
 357                          * ping ( http://xmpp.org/extensions/xep-0199.html )
 358                          */
 359                         else if (XMPP->ping_requested) {
 360                                 cprintf("<iq type=\"result\" ");
 361                                 if (!IsEmptyStr(XMPP->iq_from)) {
 362                                         cprintf("to=\"%s\" ", xmlesc(xmlbuf, XMPP->iq_from, sizeof xmlbuf));
 363                                 }
 364                                 if (!IsEmptyStr(XMPP->iq_to)) {
 365                                         cprintf("from=\"%s\" ", xmlesc(xmlbuf, XMPP->iq_to, sizeof xmlbuf));
 366                                 }
 367                                 cprintf("id=\"%s\"/>", xmlesc(xmlbuf, XMPP->iq_id, sizeof xmlbuf));
 368                         }
 369
 370                         /*
 371                          * Unknown query ... return the XML equivalent of a blank stare
 372                          */
 373                         else {
 374                                 syslog(LOG_DEBUG, "xmpp: Unknown query <%s> - returning <service-unavailable/>", el);
 375                                 cprintf("<iq type=\"error\" id=\"%s\">", xmlesc(xmlbuf, XMPP->iq_id, sizeof xmlbuf));
 376                                 cprintf("<error code=\"503\" type=\"cancel\">"
 377                                         "<service-unavailable xmlns=\"urn:ietf:params:xml:ns:xmpp-stanzas\"/>"
 378                                         "</error>"
 379                                 );
 380                                 cprintf("</iq>");
 381                         }
 382                 }
 383
 384                 /*
 385                  * Non SASL authentication
 386                  */
 387                 else if (
 388                         (!strcasecmp(XMPP->iq_type, "set"))
 389                         && (!strcasecmp(XMPP->iq_query_xmlns, "jabber:iq:auth:query"))
 390                         ) {
 391
 392                         xmpp_non_sasl_authenticate(
 393                                 XMPP->iq_id,
 394                                 XMPP->iq_client_username,
 395                                 XMPP->iq_client_password
 396                         );
 397                 }
 398
 399                 /*
 400                  * If this <iq> stanza was a "bind" attempt, process it ...
 401                  */
 402                 else if (
 403                         (XMPP->bind_requested)
 404                         && (!IsEmptyStr(XMPP->iq_id))
 405                         && (CC->logged_in)
 406                 ) {
 407
 408                         /* If the client has not specified a client resource, generate one */
 409
 410                         if (IsEmptyStr(XMPP->iq_client_resource)) {
 411                                 snprintf(XMPP->iq_client_resource, sizeof XMPP->iq_client_resource, "%d", CC->cs_pid);
 412                         }
 413
 414                         /* Generate the "full JID" of the client resource */
 415                         snprintf(XMPP->client_jid, sizeof XMPP->client_jid, "%s/%s", CC->cs_inet_email, XMPP->iq_client_resource);
 416
 417                         /* Tell the client what its JID is */
 418
 419                         cprintf("<iq type=\"result\" id=\"%s\">", xmlesc(xmlbuf, XMPP->iq_id, sizeof xmlbuf));
 420                         cprintf("<bind xmlns=\"urn:ietf:params:xml:ns:xmpp-bind\">");
 421                         cprintf("<jid>%s</jid>", xmlesc(xmlbuf, XMPP->client_jid, sizeof xmlbuf));
 422                         cprintf("</bind>");
 423                         cprintf("</iq>");
 424                 }
 425
 426                 else if (XMPP->iq_session) {
 427                         cprintf("<iq type=\"result\" id=\"%s\">", xmlesc(xmlbuf, XMPP->iq_id, sizeof xmlbuf));
 428                         cprintf("</iq>");
 429                 }
 430
 431                 else {
 432                         cprintf("<iq type=\"error\" id=\"%s\">", xmlesc(xmlbuf, XMPP->iq_id, sizeof xmlbuf));
 433                         cprintf("<error>Don't know how to do '%s'!</error>", xmlesc(xmlbuf, XMPP->iq_type, sizeof xmlbuf));
 434                         cprintf("</iq>");
 435                         syslog(LOG_DEBUG, "XMPP: don't know how to do iq_type='%s' with iq_query_xmlns='%s'", XMPP->iq_type, XMPP->iq_query_xmlns);
 436                 }
 437
 438                 /* Now clear these fields out so they don't get used by a future stanza */
 439                 XMPP->iq_id[0] = 0;
 440                 XMPP->iq_from[0] = 0;
 441                 XMPP->iq_to[0] = 0;
 442                 XMPP->iq_type[0] = 0;
 443                 XMPP->iq_client_resource[0] = 0;
 444                 XMPP->iq_session = 0;
 445                 XMPP->iq_query_xmlns[0] = 0;
 446                 XMPP->bind_requested = 0;
 447                 XMPP->ping_requested = 0;
 448         }
 449
 450         else if (!strcasecmp(el, "auth")) {
 451
 452                 /* Try to authenticate (this function is responsible for the output stanza) */
 453                 xmpp_sasl_auth(XMPP->sasl_auth_mech, (XMPP->chardata != NULL ? XMPP->chardata : "") );
 454
 455                 /* Now clear these fields out so they don't get used by a future stanza */
 456                 XMPP->sasl_auth_mech[0] = 0;
 457         }
 458
 459         else if (!strcasecmp(el, "session")) {
 460                 XMPP->iq_session = 1;
 461         }
 462
 463         else if (!strcasecmp(el, "presence")) {
 464
 465                 /* Respond to a <presence> update by firing back with presence information
 466                  * on the entire wholist.  Check this assumption, it's probably wrong.
 467                  */
 468                 xmpp_wholist_presence_dump();
 469         }
 470
 471         else if ( (!strcasecmp(el, "body")) && (XMPP->html_tag_level == 0) ) {
 472                 if (XMPP->message_body != NULL) {
 473                         free(XMPP->message_body);
 474                         XMPP->message_body = NULL;
 475                 }
 476                 if (XMPP->chardata_len > 0) {
 477                         XMPP->message_body = strdup(XMPP->chardata);
 478                 }
 479         }
 480
 481         else if (!strcasecmp(el, "message")) {
 482                 xmpp_send_message(XMPP->message_to, XMPP->message_body);
 483                 XMPP->html_tag_level = 0;
 484         }
 485
 486         else if (!strcasecmp(el, "html")) {
 487                 --XMPP->html_tag_level;
 488         }
 489
 490         else if (!strcasecmp(el, "starttls")) {
 491 #ifdef HAVE_OPENSSL
 492                 cprintf("<proceed xmlns='urn:ietf:params:xml:ns:xmpp-tls'/>");
 493                 CtdlModuleStartCryptoMsgs(NULL, NULL, NULL);
 494                 if (!CC->redirect_ssl) CC->kill_me = KILLME_NO_CRYPTO;
 495 #else
 496                 cprintf("<failure xmlns='urn:ietf:params:xml:ns:xmpp-tls'/>");
 497                 CC->kill_me = KILLME_NO_CRYPTO;
 498 #endif
 499         }
 500
 501         else if (!strcasecmp(el, "ping")) {
 502                 XMPP->ping_requested = 1;
 503         }
 504
 505         else if (!strcasecmp(el, "stream")) {
 506                 syslog(LOG_DEBUG, "xmpp: client shut down their stream");
 507                 xmpp_massacre_roster();
 508                 cprintf("</stream>\n");
 509                 CC->kill_me = KILLME_CLIENT_LOGGED_OUT;
 510         }
 511
 512         else if (!strcasecmp(el, "query")) {
 513                 /* already processed , no further action needed here */
 514         }
 515
 516         else if (!strcasecmp(el, "bind")) {
 517                 /* already processed , no further action needed here */
 518         }
 519
 520         else {
 521                 syslog(LOG_DEBUG, "xmpp: ignoring unknown tag <%s>", el);
 522         }
 523
 524         XMPP->chardata_len = 0;
 525         if (XMPP->chardata_alloc > 0) {
 526                 XMPP->chardata[0] = 0;
 527         }
 528 }
 529
 530
 531 void xmpp_xml_chardata(void *data, const XML_Char *s, int len)
 532 {
 533         citxmpp *X = XMPP;
 534
 535         if (X->chardata_alloc == 0) {
 536                 X->chardata_alloc = SIZ;
 537                 X->chardata = malloc(X->chardata_alloc);
 538         }
 539         if ((X->chardata_len + len + 1) > X->chardata_alloc) {
 540                 X->chardata_alloc = X->chardata_len + len + 1024;
 541                 X->chardata = realloc(X->chardata, X->chardata_alloc);
 542         }
 543         memcpy(&X->chardata[X->chardata_len], s, len);
 544         X->chardata_len += len;
 545         X->chardata[X->chardata_len] = 0;
 546 }
 547
 548
 549 /*
 550  * This cleanup function blows away the temporary memory and files used by the XMPP service.
 551  */
 552 void xmpp_cleanup_function(void) {
 553
 554         /* Don't do this stuff if this is not a XMPP session! */
 555         if (CC->h_command_function != xmpp_command_loop) return;
 556
 557         if (XMPP->chardata != NULL) {
 558                 free(XMPP->chardata);
 559                 XMPP->chardata = NULL;
 560                 XMPP->chardata_len = 0;
 561                 XMPP->chardata_alloc = 0;
 562                 if (XMPP->message_body != NULL) {
 563                         free(XMPP->message_body);
 564                 }
 565         }
 566         XML_ParserFree(XMPP->xp);
 567         free(XMPP);
 568 }
 569
 570
 571 /*
 572  * Here's where our XMPP session begins its happy day.
 573  */
 574 void xmpp_greeting(void) {
 575         client_set_inbound_buf(4);
 576         strcpy(CC->cs_clientname, "XMPP session");
 577         CC->session_specific_data = malloc(sizeof(citxmpp));
 578         memset(XMPP, 0, sizeof(citxmpp));
 579         XMPP->last_event_processed = queue_event_seq;
 580
 581         /* XMPP does not use a greeting, but we still have to initialize some things. */
 582
 583         XMPP->xp = XML_ParserCreateNS("UTF-8", ':');
 584         if (XMPP->xp == NULL) {
 585                 syslog(LOG_ERR, "xmpp: cannot create XML parser");
 586                 CC->kill_me = KILLME_XML_PARSER;
 587                 return;
 588         }
 589
 590         XML_SetElementHandler(XMPP->xp, xmpp_xml_start, xmpp_xml_end);
 591         XML_SetCharacterDataHandler(XMPP->xp, xmpp_xml_chardata);
 592         // XML_SetUserData(XMPP->xp, something...);
 593
 594         /* Prevent the "billion laughs" attack against expat by disabling
 595          * internal entity expansion.  With 2.x, forcibly stop the parser
 596          * if an entity is declared - this is safer and a more obvious
 597          * failure mode.  With older versions, simply prevent expansion
 598          * of such entities. */
 599 #ifdef HAVE_XML_STOPPARSER
 600         XML_SetEntityDeclHandler(XMPP->xp, xmpp_entity_declaration);
 601 #else
 602         XML_SetDefaultHandler(XMPP->xp, NULL);
 603 #endif
 604
 605         CC->can_receive_im = 1;         /* This protocol is capable of receiving instant messages */
 606 }
 607
 608
 609 /*
 610  * Main command loop for XMPP sessions.
 611  */
 612 void xmpp_command_loop(void) {
 613         int rc;
 614         StrBuf *stream_input = NewStrBuf();
 615
 616         time(&CC->lastcmd);
 617         rc = client_read_random_blob(stream_input, 30);
 618         if (rc > 0) {
 619                 XML_Parse(XMPP->xp, ChrPtr(stream_input), rc, 0);
 620         }
 621         else {
 622                 syslog(LOG_ERR, "xmpp: client disconnected: ending session.");
 623                 CC->kill_me = KILLME_CLIENT_DISCONNECTED;
 624         }
 625         FreeStrBuf(&stream_input);
 626 }
 627
 628
 629 /*
 630  * Async loop for XMPP sessions (handles the transmission of unsolicited stanzas)
 631  */
 632 void xmpp_async_loop(void) {
 633         xmpp_process_events();
 634         xmpp_output_incoming_messages();
 635 }
 636
 637
 638 /*
 639  * Login hook for XMPP sessions
 640  */
 641 void xmpp_login_hook(void) {
 642         xmpp_queue_event(XMPP_EVT_LOGIN, CC->cs_inet_email);
 643 }
 644
 645
 646 /*
 647  * Logout hook for XMPP sessions
 648  */
 649 void xmpp_logout_hook(void) {
 650         xmpp_queue_event(XMPP_EVT_LOGOUT, CC->cs_inet_email);
 651 }
 652
 653
 654 const char *CitadelServiceXMPP="XMPP";
 655 extern void xmpp_cleanup_events(void);
 656 CTDL_MODULE_INIT(xmpp)
 657 {
 658         if (!threading) {
 659                 CtdlRegisterServiceHook(CtdlGetConfigInt("c_xmpp_c2s_port"),
 660                                         NULL,
 661                                         xmpp_greeting,
 662                                         xmpp_command_loop,
 663                                         xmpp_async_loop,
 664                                         CitadelServiceXMPP
 665                 );
 666                 CtdlRegisterSessionHook(xmpp_cleanup_function, EVT_STOP, PRIO_STOP + 70);
 667                 CtdlRegisterSessionHook(xmpp_login_hook, EVT_LOGIN, PRIO_LOGIN + 90);
 668                 CtdlRegisterSessionHook(xmpp_logout_hook, EVT_LOGOUT, PRIO_LOGOUT + 90);
 669                 CtdlRegisterSessionHook(xmpp_login_hook, EVT_UNSTEALTH, PRIO_UNSTEALTH + 1);
 670                 CtdlRegisterSessionHook(xmpp_logout_hook, EVT_STEALTH, PRIO_STEALTH + 1);
 671                 CtdlRegisterCleanupHook(xmpp_cleanup_events);
 672
 673         }
 674
 675         /* return our module name for the log */
 676         return "xmpp";
 677 }