citadel/modules/xmpp/serv_xmpp.c

   1 /*
   2  * XMPP (Jabber) service for the Citadel system
   3  * Copyright (c) 2007-2017 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
  72
  73 #ifdef HAVE_XML_STOPPARSER
  74 /* Stop the parser if an entity declaration is hit. */
  75 static void xmpp_entity_declaration(void *userData, const XML_Char *entityName,
  76                                 int is_parameter_entity, const XML_Char *value,
  77                                 int value_length, const XML_Char *base,
  78                                 const XML_Char *systemId, const XML_Char *publicId,
  79                                 const XML_Char *notationName
  80 ) {
  81         syslog(LOG_WARNING, "xmpp: illegal entity declaration encountered; stopping parser.");
  82         XML_StopParser(XMPP->xp, XML_FALSE);
  83 }
  84 #endif
  85
  86
  87
  88 /*
  89  * Given a source string and a target buffer, returns the string
  90  * properly escaped for insertion into an XML stream.  Returns a
  91  * pointer to the target buffer for convenience.
  92  */
  93 static inline int Ctdl_GetUtf8SequenceLength(const char *CharS, const char *CharE)
  94 {
  95         int n = 0;
  96         unsigned char test = (1<<7);
  97
  98         if ((*CharS & 0xC0) != 0xC0)
  99                 return 1;
 100
 101         while ((n < 8) &&
 102                ((test & ((unsigned char)*CharS)) != 0))
 103         {
 104                 test = test >> 1;
 105                 n ++;
 106         }
 107         if ((n > 6) || ((CharE - CharS) < n))
 108                 n = 0;
 109         return n;
 110 }
 111
 112 char *xmlesc(char *buf, char *str, int bufsiz)
 113 {
 114         int IsUtf8Sequence;
 115         char *ptr, *pche;
 116         unsigned char ch;
 117         int inlen;
 118         int len = 0;
 119
 120         if (!buf) return(NULL);
 121         buf[0] = 0;
 122         len = 0;
 123         if (!str) {
 124                 return(buf);
 125         }
 126         inlen = strlen(str);
 127         pche = str + inlen;
 128
 129         for (ptr=str; *ptr; ptr++) {
 130                 ch = *ptr;
 131                 if (ch == '<') {
 132                         strcpy(&buf[len], "&lt;");
 133                         len += 4;
 134                 }
 135                 else if (ch == '>') {
 136                         strcpy(&buf[len], "&gt;");
 137                         len += 4;
 138                 }
 139                 else if (ch == '&') {
 140                         strcpy(&buf[len], "&amp;");
 141                         len += 5;
 142                 }
 143                 else if ((ch >= 0x20) && (ch <= 0x7F)) {
 144                         buf[len++] = ch;
 145                         buf[len] = 0;
 146                 }
 147                 else if (ch < 0x20) {
 148                         /* we probably shouldn't be doing this */
 149                         buf[len++] = '_';
 150                         buf[len] = 0;
 151                 }
 152                 else {
 153                         IsUtf8Sequence =  Ctdl_GetUtf8SequenceLength(ptr, pche);
 154                         if (IsUtf8Sequence)
 155                         {
 156                                 while ((IsUtf8Sequence > 0) &&
 157                                        (ptr < pche))
 158                                 {
 159                                         buf[len] = *ptr;
 160                                         ptr ++;
 161                                         --IsUtf8Sequence;
 162                                 }
 163                         }
 164                         else
 165                         {
 166                                 char oct[10];
 167                                 sprintf(oct, "&#%o;", ch);
 168                                 strcpy(&buf[len], oct);
 169                                 len += strlen(oct);
 170                         }
 171                 }
 172                 if ((len + 6) > bufsiz) {
 173                         return(buf);
 174                 }
 175         }
 176         return(buf);
 177 }
 178
 179
 180 /*
 181  * We have just received a <stream> tag from the client, so send them ours
 182  */
 183 void xmpp_stream_start(void *data, const char *supplied_el, const char **attr)
 184 {
 185         char xmlbuf[256];
 186
 187         while (*attr) {
 188                 if (!strcasecmp(attr[0], "to")) {
 189                         safestrncpy(XMPP->server_name, attr[1], sizeof XMPP->server_name);
 190                 }
 191                 attr += 2;
 192         }
 193
 194         cprintf("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
 195
 196         cprintf("<stream:stream ");
 197         cprintf("from=\"%s\" ", xmlesc(xmlbuf, XMPP->server_name, sizeof xmlbuf));
 198         cprintf("id=\"%08x\" ", CC->cs_pid);
 199         cprintf("version=\"1.0\" ");
 200         cprintf("xmlns:stream=\"http://etherx.jabber.org/streams\" ");
 201         cprintf("xmlns=\"jabber:client\">");
 202
 203         /* The features of this stream are... */
 204         cprintf("<stream:features>");
 205
 206         /*
 207          * TLS encryption (but only if it isn't already active)
 208          */
 209 #ifdef HAVE_OPENSSL
 210         if (!CC->redirect_ssl) {
 211                 cprintf("<starttls xmlns='urn:ietf:params:xml:ns:xmpp-tls'></starttls>");
 212         }
 213 #endif
 214
 215         if (!CC->logged_in) {
 216                 /* If we're not logged in yet, offer SASL as our feature set */
 217                 xmpp_output_auth_mechs();
 218
 219                 /* Also offer non-SASL authentication */
 220                 cprintf("<auth xmlns=\"http://jabber.org/features/iq-auth\"/>");
 221         }
 222
 223         /* Offer binding and sessions as part of our feature set */
 224         cprintf("<bind xmlns=\"urn:ietf:params:xml:ns:xmpp-bind\"/>");
 225         cprintf("<session xmlns=\"urn:ietf:params:xml:ns:xmpp-session\"/>");
 226
 227         cprintf("</stream:features>");
 228
 229         CC->is_async = 1;               /* XMPP sessions are inherently async-capable */
 230 }
 231
 232
 233 void xmpp_xml_start(void *data, const char *supplied_el, const char **attr) {
 234         char el[256];
 235         char *sep = NULL;
 236         int i;
 237
 238         /* Axe the namespace, we don't care about it */
 239         safestrncpy(el, supplied_el, sizeof el);
 240         while (sep = strchr(el, ':'), sep) {
 241                 strcpy(el, ++sep);
 242         }
 243
 244 #ifdef XMPP_XML_DEBUG
 245         syslog(LOG_DEBUG, "xmpp: ELEMENT START: <%s>", el);
 246         for (i=0; attr[i] != NULL; i+=2) {
 247                 syslog(LOG_DEBUG, "xmpp: Attribute '%s' = '%s'", attr[i], attr[i+1]);
 248         }
 249 #endif
 250
 251         if (!strcasecmp(el, "stream")) {
 252                 xmpp_stream_start(data, supplied_el, attr);
 253         }
 254
 255         else if (!strcasecmp(el, "query")) {
 256                 XMPP->iq_query_xmlns[0] = 0;
 257                 safestrncpy(XMPP->iq_query_xmlns, supplied_el, sizeof XMPP->iq_query_xmlns);
 258         }
 259
 260         else if (!strcasecmp(el, "bind")) {
 261                 XMPP->bind_requested = 1;
 262         }
 263
 264         else if (!strcasecmp(el, "iq")) {
 265                 for (i=0; attr[i] != NULL; i+=2) {
 266                         if (!strcasecmp(attr[i], "type")) {
 267                                 safestrncpy(XMPP->iq_type, attr[i+1], sizeof XMPP->iq_type);
 268                         }
 269                         else if (!strcasecmp(attr[i], "id")) {
 270                                 safestrncpy(XMPP->iq_id, attr[i+1], sizeof XMPP->iq_id);
 271                         }
 272                         else if (!strcasecmp(attr[i], "from")) {
 273                                 safestrncpy(XMPP->iq_from, attr[i+1], sizeof XMPP->iq_from);
 274                         }
 275                         else if (!strcasecmp(attr[i], "to")) {
 276                                 safestrncpy(XMPP->iq_to, attr[i+1], sizeof XMPP->iq_to);
 277                         }
 278                 }
 279         }
 280
 281         else if (!strcasecmp(el, "auth")) {
 282                 XMPP->sasl_auth_mech[0] = 0;
 283                 for (i=0; attr[i] != NULL; i+=2) {
 284                         if (!strcasecmp(attr[i], "mechanism")) {
 285                                 safestrncpy(XMPP->sasl_auth_mech, attr[i+1], sizeof XMPP->sasl_auth_mech);
 286                         }
 287                 }
 288         }
 289
 290         else if (!strcasecmp(el, "message")) {
 291                 for (i=0; attr[i] != NULL; i+=2) {
 292                         if (!strcasecmp(attr[i], "to")) {
 293                                 safestrncpy(XMPP->message_to, attr[i+1], sizeof XMPP->message_to);
 294                         }
 295                 }
 296         }
 297
 298         else if (!strcasecmp(el, "html")) {
 299                 ++XMPP->html_tag_level;
 300         }
 301 }
 302
 303
 304
 305 void xmpp_xml_end(void *data, const char *supplied_el) {
 306         char el[256];
 307         char *sep = NULL;
 308         char xmlbuf[256];
 309
 310         /* Axe the namespace, we don't care about it */
 311         safestrncpy(el, supplied_el, sizeof el);
 312         while (sep = strchr(el, ':'), sep) {
 313                 strcpy(el, ++sep);
 314         }
 315
 316 #ifdef XMPP_XML_DEBUG
 317         syslog(LOG_DEBUG, "xmpp: ELEMENT END  : <%s>", el);
 318         if (XMPP->chardata_len > 0) {
 319                 syslog(LOG_DEBUG, "xmpp: chardata: %s", XMPP->chardata);
 320         }
 321 #endif
 322
 323         if (!strcasecmp(el, "resource")) {
 324                 if (XMPP->chardata_len > 0) {
 325                         safestrncpy(XMPP->iq_client_resource, XMPP->chardata,
 326                                 sizeof XMPP->iq_client_resource);
 327                         striplt(XMPP->iq_client_resource);
 328                 }
 329         }
 330
 331         else if (!strcasecmp(el, "username")) {         /* NON SASL ONLY */
 332                 if (XMPP->chardata_len > 0) {
 333                         safestrncpy(XMPP->iq_client_username, XMPP->chardata,
 334                                 sizeof XMPP->iq_client_username);
 335                         striplt(XMPP->iq_client_username);
 336                 }
 337         }
 338
 339         else if (!strcasecmp(el, "password")) {         /* NON SASL ONLY */
 340                 if (XMPP->chardata_len > 0) {
 341                         safestrncpy(XMPP->iq_client_password, XMPP->chardata,
 342                                 sizeof XMPP->iq_client_password);
 343                         striplt(XMPP->iq_client_password);
 344                 }
 345         }
 346
 347         else if (!strcasecmp(el, "iq")) {
 348
 349                 /*
 350                  * iq type="get" (handle queries)
 351                  */
 352                 if (!strcasecmp(XMPP->iq_type, "get")) {
 353
 354                         /*
 355                          * Query on a namespace
 356                          */
 357                         if (!IsEmptyStr(XMPP->iq_query_xmlns)) {
 358                                 xmpp_query_namespace(XMPP->iq_id, XMPP->iq_from,
 359                                                 XMPP->iq_to, XMPP->iq_query_xmlns);
 360                         }
 361
 362                         /*
 363                          * ping ( http://xmpp.org/extensions/xep-0199.html )
 364                          */
 365                         else if (XMPP->ping_requested) {
 366                                 cprintf("<iq type=\"result\" ");
 367                                 if (!IsEmptyStr(XMPP->iq_from)) {
 368                                         cprintf("to=\"%s\" ", xmlesc(xmlbuf, XMPP->iq_from, sizeof xmlbuf));
 369                                 }
 370                                 if (!IsEmptyStr(XMPP->iq_to)) {
 371                                         cprintf("from=\"%s\" ", xmlesc(xmlbuf, XMPP->iq_to, sizeof xmlbuf));
 372                                 }
 373                                 cprintf("id=\"%s\"/>", xmlesc(xmlbuf, XMPP->iq_id, sizeof xmlbuf));
 374                         }
 375
 376                         /*
 377                          * Unknown query ... return the XML equivalent of a blank stare
 378                          */
 379                         else {
 380                                 syslog(LOG_DEBUG, "xmpp: Unknown query <%s> - returning <service-unavailable/>", el);
 381                                 cprintf("<iq type=\"error\" id=\"%s\">", xmlesc(xmlbuf, XMPP->iq_id, sizeof xmlbuf));
 382                                 cprintf("<error code=\"503\" type=\"cancel\">"
 383                                         "<service-unavailable xmlns=\"urn:ietf:params:xml:ns:xmpp-stanzas\"/>"
 384                                         "</error>"
 385                                 );
 386                                 cprintf("</iq>");
 387                         }
 388                 }
 389
 390                 /*
 391                  * Non SASL authentication
 392                  */
 393                 else if (
 394                         (!strcasecmp(XMPP->iq_type, "set"))
 395                         && (!strcasecmp(XMPP->iq_query_xmlns, "jabber:iq:auth:query"))
 396                         ) {
 397
 398                         xmpp_non_sasl_authenticate(
 399                                 XMPP->iq_id,
 400                                 XMPP->iq_client_username,
 401                                 XMPP->iq_client_password,
 402                                 XMPP->iq_client_resource
 403                         );
 404                 }
 405
 406                 /*
 407                  * If this <iq> stanza was a "bind" attempt, process it ...
 408                  */
 409                 else if (
 410                         (XMPP->bind_requested)
 411                         && (!IsEmptyStr(XMPP->iq_id))
 412                         && (!IsEmptyStr(XMPP->iq_client_resource))
 413                         && (CC->logged_in)
 414                         ) {
 415
 416                         /* Generate the "full JID" of the client resource */
 417
 418                         snprintf(XMPP->client_jid, sizeof XMPP->client_jid,
 419                                 "%s/%s",
 420                                 CC->cs_inet_email,
 421                                 XMPP->iq_client_resource
 422                         );
 423
 424                         /* Tell the client what its JID is */
 425
 426                         cprintf("<iq type=\"result\" id=\"%s\">", xmlesc(xmlbuf, XMPP->iq_id, sizeof xmlbuf));
 427                         cprintf("<bind xmlns=\"urn:ietf:params:xml:ns:xmpp-bind\">");
 428                         cprintf("<jid>%s</jid>", xmlesc(xmlbuf, XMPP->client_jid, sizeof xmlbuf));
 429                         cprintf("</bind>");
 430                         cprintf("</iq>");
 431                 }
 432
 433                 else if (XMPP->iq_session) {
 434                         cprintf("<iq type=\"result\" id=\"%s\">", xmlesc(xmlbuf, XMPP->iq_id, sizeof xmlbuf));
 435                         cprintf("</iq>");
 436                 }
 437
 438                 else {
 439                         cprintf("<iq type=\"error\" id=\"%s\">", xmlesc(xmlbuf, XMPP->iq_id, sizeof xmlbuf));
 440                         cprintf("<error>Don't know how to do '%s'!</error>", xmlesc(xmlbuf, XMPP->iq_type, sizeof xmlbuf));
 441                         cprintf("</iq>");
 442                         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);
 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                 syslog(LOG_DEBUG, "xmpp: client shut down their stream");
 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                 syslog(LOG_DEBUG, "xmpp: ignoring unknown tag <%s>", 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                 syslog(LOG_ERR, "xmpp: cannot create XML parser");
 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                 syslog(LOG_ERR, "xmpp: client disconnected: ending session.");
 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 const char *CitadelServiceXMPP="XMPP";
 663 extern void xmpp_cleanup_events(void);
 664 CTDL_MODULE_INIT(xmpp)
 665 {
 666         if (!threading) {
 667                 CtdlRegisterServiceHook(CtdlGetConfigInt("c_xmpp_c2s_port"),
 668                                         NULL,
 669                                         xmpp_greeting,
 670                                         xmpp_command_loop,
 671                                         xmpp_async_loop,
 672                                         CitadelServiceXMPP
 673                 );
 674                 CtdlRegisterSessionHook(xmpp_cleanup_function, EVT_STOP, PRIO_STOP + 70);
 675                 CtdlRegisterSessionHook(xmpp_login_hook, EVT_LOGIN, PRIO_LOGIN + 90);
 676                 CtdlRegisterSessionHook(xmpp_logout_hook, EVT_LOGOUT, PRIO_LOGOUT + 90);
 677                 CtdlRegisterSessionHook(xmpp_login_hook, EVT_UNSTEALTH, PRIO_UNSTEALTH + 1);
 678                 CtdlRegisterSessionHook(xmpp_logout_hook, EVT_STEALTH, PRIO_STEALTH + 1);
 679                 CtdlRegisterCleanupHook(xmpp_cleanup_events);
 680
 681         }
 682
 683         /* return our module name for the log */
 684         return "xmpp";
 685 }