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 #ifdef HAVE_XML_STOPPARSER
  71 /* Stop the parser if an entity declaration is hit. */
  72 static void xmpp_entity_declaration(void *userData, const XML_Char *entityName,
  73                                 int is_parameter_entity, const XML_Char *value,
  74                                 int value_length, const XML_Char *base,
  75                                 const XML_Char *systemId, const XML_Char *publicId,
  76                                 const XML_Char *notationName
  77 ) {
  78         syslog(LOG_WARNING, "xmpp: illegal entity declaration encountered; stopping parser.");
  79         XML_StopParser(XMPP->xp, XML_FALSE);
  80 }
  81 #endif
  82
  83
  84 /*
  85  * Given a source string and a target buffer, returns the string
  86  * properly escaped for insertion into an XML stream.  Returns a
  87  * pointer to the target buffer for convenience.
  88  */
  89 static inline int Ctdl_GetUtf8SequenceLength(const char *CharS, const char *CharE)
  90 {
  91         int n = 0;
  92         unsigned char test = (1<<7);
  93
  94         if ((*CharS & 0xC0) != 0xC0) {
  95                 return 1;
  96         }
  97
  98         while ((n < 8) && ((test & ((unsigned char)*CharS)) != 0))  {
  99                 test = test >> 1;
 100                 n ++;
 101         }
 102         if ((n > 6) || ((CharE - CharS) < n)) {
 103                 n = 0;
 104         }
 105         return n;
 106 }
 107
 108
 109 char *xmlesc(char *buf, char *str, int bufsiz)
 110 {
 111         int IsUtf8Sequence;
 112         char *ptr, *pche;
 113         unsigned char ch;
 114         int inlen;
 115         int len = 0;
 116
 117         if (!buf) return(NULL);
 118         buf[0] = 0;
 119         len = 0;
 120         if (!str) {
 121                 return(buf);
 122         }
 123         inlen = strlen(str);
 124         pche = str + inlen;
 125
 126         for (ptr=str; *ptr; ptr++) {
 127                 ch = *ptr;
 128                 if (ch == '<') {
 129                         strcpy(&buf[len], "&lt;");
 130                         len += 4;
 131                 }
 132                 else if (ch == '>') {
 133                         strcpy(&buf[len], "&gt;");
 134                         len += 4;
 135                 }
 136                 else if (ch == '&') {
 137                         strcpy(&buf[len], "&amp;");
 138                         len += 5;
 139                 }
 140                 else if ((ch >= 0x20) && (ch <= 0x7F)) {
 141                         buf[len++] = ch;
 142                         buf[len] = 0;
 143                 }
 144                 else if (ch < 0x20) {
 145                         /* we probably shouldn't be doing this */
 146                         buf[len++] = '_';
 147                         buf[len] = 0;
 148                 }
 149                 else {
 150                         IsUtf8Sequence =  Ctdl_GetUtf8SequenceLength(ptr, pche);
 151                         if (IsUtf8Sequence)
 152                         {
 153                                 while ((IsUtf8Sequence > 0) &&
 154                                        (ptr < pche))
 155                                 {
 156                                         buf[len] = *ptr;
 157                                         ptr ++;
 158                                         --IsUtf8Sequence;
 159                                 }
 160                         }
 161                         else
 162                         {
 163                                 char oct[10];
 164                                 sprintf(oct, "&#%o;", ch);
 165                                 strcpy(&buf[len], oct);
 166                                 len += strlen(oct);
 167                         }
 168                 }
 169                 if ((len + 6) > bufsiz) {
 170                         return(buf);
 171                 }
 172         }
 173         return(buf);
 174 }
 175
 176
 177 /*
 178  * We have just received a <stream> tag from the client, so send them ours
 179  */
 180 void xmpp_stream_start(void *data, const char *supplied_el, const char **attr)
 181 {
 182         char xmlbuf[256];
 183
 184         while (*attr) {
 185                 if (!strcasecmp(attr[0], "to")) {
 186                         safestrncpy(XMPP->server_name, attr[1], sizeof XMPP->server_name);
 187                 }
 188                 attr += 2;
 189         }
 190
 191         cprintf("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
 192
 193         cprintf("<stream:stream ");
 194         cprintf("from=\"%s\" ", xmlesc(xmlbuf, XMPP->server_name, sizeof xmlbuf));
 195         cprintf("id=\"%08x\" ", CC->cs_pid);
 196         cprintf("version=\"1.0\" ");
 197         cprintf("xmlns:stream=\"http://etherx.jabber.org/streams\" ");
 198         cprintf("xmlns=\"jabber:client\">");
 199
 200         /* The features of this stream are... */
 201         cprintf("<stream:features>");
 202
 203         /*
 204          * TLS encryption (but only if it isn't already active)
 205          */
 206 #ifdef HAVE_OPENSSL
 207         if (!CC->redirect_ssl) {
 208                 cprintf("<starttls xmlns='urn:ietf:params:xml:ns:xmpp-tls'></starttls>");
 209         }
 210 #endif
 211
 212         if (!CC->logged_in) {
 213                 /* If we're not logged in yet, offer SASL as our feature set */
 214                 xmpp_output_auth_mechs();
 215
 216                 /* Also offer non-SASL authentication */
 217                 cprintf("<auth xmlns=\"http://jabber.org/features/iq-auth\"/>");
 218         }
 219
 220         /* Offer binding and sessions as part of our feature set */
 221         cprintf("<bind xmlns=\"urn:ietf:params:xml:ns:xmpp-bind\"/>");
 222         cprintf("<session xmlns=\"urn:ietf:params:xml:ns:xmpp-session\"/>");
 223
 224         cprintf("</stream:features>");
 225
 226         CC->is_async = 1;               /* XMPP sessions are inherently async-capable */
 227 }
 228
 229
 230 void xmpp_xml_start(void *data, const char *supplied_el, const char **attr) {
 231         char el[256];
 232         char *sep = NULL;
 233         int i;
 234
 235         /* Axe the namespace, we don't care about it */
 236         safestrncpy(el, supplied_el, sizeof el);
 237         while (sep = strchr(el, ':'), sep) {
 238                 strcpy(el, ++sep);
 239         }
 240
 241 #ifdef XMPP_XML_DEBUG
 242         syslog(LOG_DEBUG, "xmpp: ELEMENT START: <%s>", el);
 243         for (i=0; attr[i] != NULL; i+=2) {
 244                 syslog(LOG_DEBUG, "xmpp: Attribute '%s' = '%s'", attr[i], attr[i+1]);
 245         }
 246 #endif
 247
 248         if (!strcasecmp(el, "stream")) {
 249                 xmpp_stream_start(data, supplied_el, attr);
 250         }
 251
 252         else if (!strcasecmp(el, "query")) {
 253                 XMPP->iq_query_xmlns[0] = 0;
 254                 safestrncpy(XMPP->iq_query_xmlns, supplied_el, sizeof XMPP->iq_query_xmlns);
 255         }
 256
 257         else if (!strcasecmp(el, "bind")) {
 258                 XMPP->bind_requested = 1;
 259         }
 260
 261         else if (!strcasecmp(el, "iq")) {
 262                 for (i=0; attr[i] != NULL; i+=2) {
 263                         if (!strcasecmp(attr[i], "type")) {
 264                                 safestrncpy(XMPP->iq_type, attr[i+1], sizeof XMPP->iq_type);
 265                         }
 266                         else if (!strcasecmp(attr[i], "id")) {
 267                                 safestrncpy(XMPP->iq_id, attr[i+1], sizeof XMPP->iq_id);
 268                         }
 269                         else if (!strcasecmp(attr[i], "from")) {
 270                                 safestrncpy(XMPP->iq_from, attr[i+1], sizeof XMPP->iq_from);
 271                         }
 272                         else if (!strcasecmp(attr[i], "to")) {
 273                                 safestrncpy(XMPP->iq_to, attr[i+1], sizeof XMPP->iq_to);
 274                         }
 275                 }
 276         }
 277
 278         else if (!strcasecmp(el, "auth")) {
 279                 XMPP->sasl_auth_mech[0] = 0;
 280                 for (i=0; attr[i] != NULL; i+=2) {
 281                         if (!strcasecmp(attr[i], "mechanism")) {
 282                                 safestrncpy(XMPP->sasl_auth_mech, attr[i+1], sizeof XMPP->sasl_auth_mech);
 283                         }
 284                 }
 285         }
 286
 287         else if (!strcasecmp(el, "message")) {
 288                 for (i=0; attr[i] != NULL; i+=2) {
 289                         if (!strcasecmp(attr[i], "to")) {
 290                                 safestrncpy(XMPP->message_to, attr[i+1], sizeof XMPP->message_to);
 291                         }
 292                 }
 293         }
 294
 295         else if (!strcasecmp(el, "html")) {
 296                 ++XMPP->html_tag_level;
 297         }
 298 }
 299
 300
 301 void xmpp_xml_end(void *data, const char *supplied_el) {
 302         char el[256];
 303         char *sep = NULL;
 304         char xmlbuf[256];
 305
 306         /* Axe the namespace, we don't care about it */
 307         safestrncpy(el, supplied_el, sizeof el);
 308         while (sep = strchr(el, ':'), sep) {
 309                 strcpy(el, ++sep);
 310         }
 311
 312 #ifdef XMPP_XML_DEBUG
 313         syslog(LOG_DEBUG, "xmpp: ELEMENT END  : <%s>", el);
 314         if (XMPP->chardata_len > 0) {
 315                 syslog(LOG_DEBUG, "xmpp: chardata: %s", XMPP->chardata);
 316         }
 317 #endif
 318
 319         if (!strcasecmp(el, "resource")) {
 320                 if (XMPP->chardata_len > 0) {
 321                         safestrncpy(XMPP->iq_client_resource, XMPP->chardata, sizeof XMPP->iq_client_resource);
 322                         striplt(XMPP->iq_client_resource);
 323                 }
 324         }
 325
 326         else if (!strcasecmp(el, "username")) {         /* NON SASL ONLY */
 327                 if (XMPP->chardata_len > 0) {
 328                         safestrncpy(XMPP->iq_client_username, XMPP->chardata, sizeof XMPP->iq_client_username);
 329                         striplt(XMPP->iq_client_username);
 330                 }
 331         }
 332
 333         else if (!strcasecmp(el, "password")) {         /* NON SASL ONLY */
 334                 if (XMPP->chardata_len > 0) {
 335                         safestrncpy(XMPP->iq_client_password, XMPP->chardata, sizeof XMPP->iq_client_password);
 336                         striplt(XMPP->iq_client_password);
 337                 }
 338         }
 339
 340         else if (!strcasecmp(el, "iq")) {
 341
 342                 /*
 343                  * iq type="get" (handle queries)
 344                  */
 345                 if (!strcasecmp(XMPP->iq_type, "get")) {
 346
 347                         /*
 348                          * Query on a namespace
 349                          */
 350                         if (!IsEmptyStr(XMPP->iq_query_xmlns)) {
 351                                 xmpp_query_namespace(XMPP->iq_id, XMPP->iq_from, XMPP->iq_to, XMPP->iq_query_xmlns);
 352                         }
 353
 354                         /*
 355                          * ping ( http://xmpp.org/extensions/xep-0199.html )
 356                          */
 357                         else if (XMPP->ping_requested) {
 358                                 cprintf("<iq type=\"result\" ");
 359                                 if (!IsEmptyStr(XMPP->iq_from)) {
 360                                         cprintf("to=\"%s\" ", xmlesc(xmlbuf, XMPP->iq_from, sizeof xmlbuf));
 361                                 }
 362                                 if (!IsEmptyStr(XMPP->iq_to)) {
 363                                         cprintf("from=\"%s\" ", xmlesc(xmlbuf, XMPP->iq_to, sizeof xmlbuf));
 364                                 }
 365                                 cprintf("id=\"%s\"/>", xmlesc(xmlbuf, XMPP->iq_id, sizeof xmlbuf));
 366                         }
 367
 368                         /*
 369                          * Unknown query ... return the XML equivalent of a blank stare
 370                          */
 371                         else {
 372                                 syslog(LOG_DEBUG, "xmpp: Unknown query <%s> - returning <service-unavailable/>", el);
 373                                 cprintf("<iq type=\"error\" id=\"%s\">", xmlesc(xmlbuf, XMPP->iq_id, sizeof xmlbuf));
 374                                 cprintf("<error code=\"503\" type=\"cancel\">"
 375                                         "<service-unavailable xmlns=\"urn:ietf:params:xml:ns:xmpp-stanzas\"/>"
 376                                         "</error>"
 377                                 );
 378                                 cprintf("</iq>");
 379                         }
 380                 }
 381
 382                 /*
 383                  * Non SASL authentication
 384                  */
 385                 else if (
 386                         (!strcasecmp(XMPP->iq_type, "set"))
 387                         && (!strcasecmp(XMPP->iq_query_xmlns, "jabber:iq:auth:query"))
 388                         ) {
 389
 390                         xmpp_non_sasl_authenticate(
 391                                 XMPP->iq_id,
 392                                 XMPP->iq_client_username,
 393                                 XMPP->iq_client_password
 394                         );
 395                 }
 396
 397                 /*
 398                  * If this <iq> stanza was a "bind" attempt, process it ...
 399                  */
 400                 else if (
 401                         (XMPP->bind_requested)
 402                         && (!IsEmptyStr(XMPP->iq_id))
 403                         && (CC->logged_in)
 404                 ) {
 405
 406                         /* If the client has not specified a client resource, generate one */
 407                         if (IsEmptyStr(XMPP->iq_client_resource)) {
 408                                 snprintf(XMPP->iq_client_resource, sizeof XMPP->iq_client_resource, "%d", CC->cs_pid);
 409                         }
 410
 411                         /* Generate the "full JID" of the client (user@host/resource) */
 412                         snprintf(XMPP->client_jid, sizeof XMPP->client_jid, "%s/%s", CC->cs_inet_email, XMPP->iq_client_resource);
 413
 414                         /* Tell the client what its JID is */
 415                         cprintf("<iq type=\"result\" id=\"%s\">", xmlesc(xmlbuf, XMPP->iq_id, sizeof xmlbuf));
 416                         cprintf("<bind xmlns=\"urn:ietf:params:xml:ns:xmpp-bind\">");
 417                         cprintf("<jid>%s</jid>", xmlesc(xmlbuf, XMPP->client_jid, sizeof xmlbuf));
 418                         cprintf("</bind>");
 419                         cprintf("</iq>");
 420                 }
 421
 422                 else if (XMPP->iq_session) {
 423                         cprintf("<iq type=\"result\" id=\"%s\">", xmlesc(xmlbuf, XMPP->iq_id, sizeof xmlbuf));
 424                         cprintf("</iq>");
 425                 }
 426
 427                 else {
 428                         cprintf("<iq type=\"error\" id=\"%s\">", xmlesc(xmlbuf, XMPP->iq_id, sizeof xmlbuf));
 429                         cprintf("<error>Don't know how to do '%s'!</error>", xmlesc(xmlbuf, XMPP->iq_type, sizeof xmlbuf));
 430                         cprintf("</iq>");
 431                         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);
 432                 }
 433
 434                 /* Now clear these fields out so they don't get used by a future stanza */
 435                 XMPP->iq_id[0] = 0;
 436                 XMPP->iq_from[0] = 0;
 437                 XMPP->iq_to[0] = 0;
 438                 XMPP->iq_type[0] = 0;
 439                 XMPP->iq_client_resource[0] = 0;
 440                 XMPP->iq_session = 0;
 441                 XMPP->iq_query_xmlns[0] = 0;
 442                 XMPP->bind_requested = 0;
 443                 XMPP->ping_requested = 0;
 444         }
 445
 446         else if (!strcasecmp(el, "auth")) {
 447
 448                 /* Try to authenticate (this function is responsible for the output stanza) */
 449                 xmpp_sasl_auth(XMPP->sasl_auth_mech, (XMPP->chardata != NULL ? XMPP->chardata : "") );
 450
 451                 /* Now clear these fields out so they don't get used by a future stanza */
 452                 XMPP->sasl_auth_mech[0] = 0;
 453         }
 454
 455         else if (!strcasecmp(el, "session")) {
 456                 XMPP->iq_session = 1;
 457         }
 458
 459         else if (!strcasecmp(el, "presence")) {
 460
 461                 /* Respond to a <presence> update by firing back with presence information
 462                  * on the entire wholist.  Check this assumption, it's probably wrong.
 463                  */
 464                 xmpp_wholist_presence_dump();
 465         }
 466
 467         else if ( (!strcasecmp(el, "body")) && (XMPP->html_tag_level == 0) ) {
 468                 if (XMPP->message_body != NULL) {
 469                         free(XMPP->message_body);
 470                         XMPP->message_body = NULL;
 471                 }
 472                 if (XMPP->chardata_len > 0) {
 473                         XMPP->message_body = strdup(XMPP->chardata);
 474                 }
 475         }
 476
 477         else if (!strcasecmp(el, "message")) {
 478                 xmpp_send_message(XMPP->message_to, XMPP->message_body);
 479                 XMPP->html_tag_level = 0;
 480         }
 481
 482         else if (!strcasecmp(el, "html")) {
 483                 --XMPP->html_tag_level;
 484         }
 485
 486         else if (!strcasecmp(el, "starttls")) {
 487 #ifdef HAVE_OPENSSL
 488                 cprintf("<proceed xmlns='urn:ietf:params:xml:ns:xmpp-tls'/>");
 489                 CtdlModuleStartCryptoMsgs(NULL, NULL, NULL);
 490                 if (!CC->redirect_ssl) CC->kill_me = KILLME_NO_CRYPTO;
 491 #else
 492                 cprintf("<failure xmlns='urn:ietf:params:xml:ns:xmpp-tls'/>");
 493                 CC->kill_me = KILLME_NO_CRYPTO;
 494 #endif
 495         }
 496
 497         else if (!strcasecmp(el, "ping")) {
 498                 XMPP->ping_requested = 1;
 499         }
 500
 501         else if (!strcasecmp(el, "stream")) {
 502                 syslog(LOG_DEBUG, "xmpp: client shut down their stream");
 503                 xmpp_massacre_roster();
 504                 cprintf("</stream>\n");
 505                 CC->kill_me = KILLME_CLIENT_LOGGED_OUT;
 506         }
 507
 508         else if (!strcasecmp(el, "query")) {
 509                 /* already processed , no further action needed here */
 510         }
 511
 512         else if (!strcasecmp(el, "bind")) {
 513                 /* already processed , no further action needed here */
 514         }
 515
 516         else {
 517                 syslog(LOG_DEBUG, "xmpp: ignoring unknown tag <%s>", el);
 518         }
 519
 520         XMPP->chardata_len = 0;
 521         if (XMPP->chardata_alloc > 0) {
 522                 XMPP->chardata[0] = 0;
 523         }
 524 }
 525
 526
 527 void xmpp_xml_chardata(void *data, const XML_Char *s, int len)
 528 {
 529         citxmpp *X = XMPP;
 530
 531         if (X->chardata_alloc == 0) {
 532                 X->chardata_alloc = SIZ;
 533                 X->chardata = malloc(X->chardata_alloc);
 534         }
 535         if ((X->chardata_len + len + 1) > X->chardata_alloc) {
 536                 X->chardata_alloc = X->chardata_len + len + 1024;
 537                 X->chardata = realloc(X->chardata, X->chardata_alloc);
 538         }
 539         memcpy(&X->chardata[X->chardata_len], s, len);
 540         X->chardata_len += len;
 541         X->chardata[X->chardata_len] = 0;
 542 }
 543
 544
 545 /*
 546  * This cleanup function blows away the temporary memory and files used by the XMPP service.
 547  */
 548 void xmpp_cleanup_function(void) {
 549
 550         /* Don't do this stuff if this is not a XMPP session! */
 551         if (CC->h_command_function != xmpp_command_loop) return;
 552
 553         if (XMPP->chardata != NULL) {
 554                 free(XMPP->chardata);
 555                 XMPP->chardata = NULL;
 556                 XMPP->chardata_len = 0;
 557                 XMPP->chardata_alloc = 0;
 558                 if (XMPP->message_body != NULL) {
 559                         free(XMPP->message_body);
 560                 }
 561         }
 562         XML_ParserFree(XMPP->xp);
 563         free(XMPP);
 564 }
 565
 566
 567 /*
 568  * Here's where our XMPP session begins its happy day.
 569  */
 570 void xmpp_greeting(void) {
 571         client_set_inbound_buf(4);
 572         strcpy(CC->cs_clientname, "XMPP session");
 573         CC->session_specific_data = malloc(sizeof(citxmpp));
 574         memset(XMPP, 0, sizeof(citxmpp));
 575         XMPP->last_event_processed = queue_event_seq;
 576
 577         /* XMPP does not use a greeting, but we still have to initialize some things. */
 578
 579         XMPP->xp = XML_ParserCreateNS("UTF-8", ':');
 580         if (XMPP->xp == NULL) {
 581                 syslog(LOG_ERR, "xmpp: cannot create XML parser");
 582                 CC->kill_me = KILLME_XML_PARSER;
 583                 return;
 584         }
 585
 586         XML_SetElementHandler(XMPP->xp, xmpp_xml_start, xmpp_xml_end);
 587         XML_SetCharacterDataHandler(XMPP->xp, xmpp_xml_chardata);
 588         // XML_SetUserData(XMPP->xp, something...);
 589
 590         /* Prevent the "billion laughs" attack against expat by disabling
 591          * internal entity expansion.  With 2.x, forcibly stop the parser
 592          * if an entity is declared - this is safer and a more obvious
 593          * failure mode.  With older versions, simply prevent expansion
 594          * of such entities. */
 595 #ifdef HAVE_XML_STOPPARSER
 596         XML_SetEntityDeclHandler(XMPP->xp, xmpp_entity_declaration);
 597 #else
 598         XML_SetDefaultHandler(XMPP->xp, NULL);
 599 #endif
 600
 601         CC->can_receive_im = 1;         /* This protocol is capable of receiving instant messages */
 602 }
 603
 604
 605 /*
 606  * Main command loop for XMPP sessions.
 607  */
 608 void xmpp_command_loop(void) {
 609         int rc;
 610         StrBuf *stream_input = NewStrBuf();
 611
 612         time(&CC->lastcmd);
 613         rc = client_read_random_blob(stream_input, 30);
 614         if (rc > 0) {
 615                 XML_Parse(XMPP->xp, ChrPtr(stream_input), rc, 0);
 616         }
 617         else {
 618                 syslog(LOG_ERR, "xmpp: client disconnected: ending session.");
 619                 CC->kill_me = KILLME_CLIENT_DISCONNECTED;
 620         }
 621         FreeStrBuf(&stream_input);
 622 }
 623
 624
 625 /*
 626  * Async loop for XMPP sessions (handles the transmission of unsolicited stanzas)
 627  */
 628 void xmpp_async_loop(void) {
 629         xmpp_process_events();
 630         xmpp_output_incoming_messages();
 631 }
 632
 633
 634 /*
 635  * Login hook for XMPP sessions
 636  */
 637 void xmpp_login_hook(void) {
 638         xmpp_queue_event(XMPP_EVT_LOGIN, CC->cs_inet_email);
 639 }
 640
 641
 642 /*
 643  * Logout hook for XMPP sessions
 644  */
 645 void xmpp_logout_hook(void) {
 646         xmpp_queue_event(XMPP_EVT_LOGOUT, CC->cs_inet_email);
 647 }
 648
 649
 650 const char *CitadelServiceXMPP="XMPP";
 651 extern void xmpp_cleanup_events(void);
 652 CTDL_MODULE_INIT(xmpp)
 653 {
 654         if (!threading) {
 655                 CtdlRegisterServiceHook(CtdlGetConfigInt("c_xmpp_c2s_port"),
 656                                         NULL,
 657                                         xmpp_greeting,
 658                                         xmpp_command_loop,
 659                                         xmpp_async_loop,
 660                                         CitadelServiceXMPP
 661                 );
 662                 CtdlRegisterSessionHook(xmpp_cleanup_function, EVT_STOP, PRIO_STOP + 70);
 663                 CtdlRegisterSessionHook(xmpp_login_hook, EVT_LOGIN, PRIO_LOGIN + 90);
 664                 CtdlRegisterSessionHook(xmpp_logout_hook, EVT_LOGOUT, PRIO_LOGOUT + 90);
 665                 CtdlRegisterSessionHook(xmpp_login_hook, EVT_UNSTEALTH, PRIO_UNSTEALTH + 1);
 666                 CtdlRegisterSessionHook(xmpp_logout_hook, EVT_STEALTH, PRIO_STEALTH + 1);
 667                 CtdlRegisterCleanupHook(xmpp_cleanup_events);
 668
 669         }
 670
 671         /* return our module name for the log */
 672         return "xmpp";
 673 }