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 <<<<<<< HEAD
  83         syslog(LOG_WARNING, "Illegal entity declaration encountered; stopping parser.");
  84 =======
  85         XMPPM_syslog(LOG_WARNING, "Illegal entity declaration encountered; stopping parser.");
  86 >>>>>>> 1c0b8162b0a90f2e97028a531005c11b09441498
  87         XML_StopParser(XMPP->xp, XML_FALSE);
  88 }
  89 #endif
  90
  91 static inline int XMPP_GetUtf8SequenceLength(const char *CharS, const char *CharE)
  92 {
  93         /* if this is is migrated to strbuf, remove this copy. */
  94         int n = 0;
  95         unsigned char test = (1<<7);
  96
  97         if ((*CharS & 0xC0) != 0xC0)
  98                 return 1;
  99
 100         while ((n < 8) &&
 101                ((test & ((unsigned char)*CharS)) != 0))
 102         {
 103                 test = test >> 1;
 104                 n ++;
 105         }
 106         if ((n > 6) || ((CharE - CharS) < n))
 107                 n = 0;
 108         return n;
 109 }
 110
 111
 112 /*
 113  * Given a source string and a target buffer, returns the string
 114  * properly escaped for insertion into an XML stream.  Returns a
 115  * pointer to the target buffer for convenience.
 116  *
 117  * BUG: this does not properly handle UTF-8
 118  */
 119 char *xmlesc(char *buf, char *str, int bufsiz)
 120 {
 121         char *ptr;
 122         char *eiptr;
 123         unsigned char ch;
 124         int inlen;
 125         int len = 0;
 126         int IsUtf8Sequence;
 127
 128         if (!buf) return(NULL);
 129         buf[0] = 0;
 130         len = 0;
 131         if (!str) {
 132                 return(buf);
 133         }
 134
 135         inlen = strlen(str);
 136         eiptr = str + inlen;
 137
 138         for (ptr=str; *ptr; ptr++) {
 139                 ch = *ptr;
 140                 if (ch == '<') {
 141                         strcpy(&buf[len], "&lt;");
 142                         len += 4;
 143                 }
 144                 else if (ch == '>') {
 145                         strcpy(&buf[len], "&gt;");
 146                         len += 4;
 147                 }
 148                 else if (ch == '&') {
 149                         strcpy(&buf[len], "&amp;");
 150                         len += 5;
 151                 }
 152                 else if ((ch >= 0x20) && (ch <= 0x7F)) {
 153                         buf[len++] = ch;
 154                         buf[len] = 0;
 155                 }
 156                 else if (ch < 0x20) {
 157                         /* we probably shouldn't be doing this */
 158                         buf[len++] = '_';
 159                         buf[len] = 0;
 160                 }
 161                 else {
 162                         char oct[32];
 163
 164                         IsUtf8Sequence =  XMPP_GetUtf8SequenceLength(&buf[len], eiptr);
 165                         if (IsUtf8Sequence)
 166                         {
 167                                 while (IsUtf8Sequence > 0){
 168                                         buf[len] = *ptr;
 169                                         len ++;
 170                                         if (--IsUtf8Sequence)
 171                                                 ptr++;
 172                                 }
 173                                 buf[len] = '\0';
 174                         }
 175                         else
 176                         {
 177                                 sprintf(oct, "&#%o;", ch);
 178                                 strcpy(&buf[len], oct);
 179                                 len += strlen(oct);
 180                         }
 181                 }
 182                 if ((len + 6) > bufsiz) {
 183                         return(buf);
 184                 }
 185         }
 186         return(buf);
 187 }
 188
 189
 190 /*
 191  * We have just received a <stream> tag from the client, so send them ours
 192  */
 193 void xmpp_stream_start(void *data, const char *supplied_el, const char **attr)
 194 {
 195         char xmlbuf[256];
 196
 197         while (*attr) {
 198                 if (!strcasecmp(attr[0], "to")) {
 199                         safestrncpy(XMPP->server_name, attr[1], sizeof XMPP->server_name);
 200                 }
 201                 attr += 2;
 202         }
 203
 204         cprintf("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
 205
 206         cprintf("<stream:stream ");
 207         cprintf("from=\"%s\" ", xmlesc(xmlbuf, XMPP->server_name, sizeof xmlbuf));
 208         cprintf("id=\"%08x\" ", CC->cs_pid);
 209         cprintf("version=\"1.0\" ");
 210         cprintf("xmlns:stream=\"http://etherx.jabber.org/streams\" ");
 211         cprintf("xmlns=\"jabber:client\">");
 212
 213         /* The features of this stream are... */
 214         cprintf("<stream:features>");
 215
 216         /*
 217          * TLS encryption (but only if it isn't already active)
 218 <<<<<<< HEAD
 219          */
 220 =======
 221          * /
 222 >>>>>>> 1c0b8162b0a90f2e97028a531005c11b09441498
 223 #ifdef HAVE_OPENSSL
 224         if (!CC->redirect_ssl) {
 225                 cprintf("<starttls xmlns='urn:ietf:params:xml:ns:xmpp-tls'></starttls>");
 226         }
 227 #endif
 228 <<<<<<< HEAD
 229
 230 =======
 231         */
 232 >>>>>>> 1c0b8162b0a90f2e97028a531005c11b09441498
 233         if (!CC->logged_in) {
 234                 /* If we're not logged in yet, offer SASL as our feature set */
 235                 xmpp_output_auth_mechs();
 236
 237                 /* Also offer non-SASL authentication */
 238                 cprintf("<auth xmlns=\"http://jabber.org/features/iq-auth\"/>");
 239         }
 240
 241         /* Offer binding and sessions as part of our feature set */
 242         cprintf("<bind xmlns=\"urn:ietf:params:xml:ns:xmpp-bind\"/>");
 243         cprintf("<session xmlns=\"urn:ietf:params:xml:ns:xmpp-session\"/>");
 244 <<<<<<< HEAD
 245
 246         cprintf("</stream:features>");
 247 =======
 248 >>>>>>> 1c0b8162b0a90f2e97028a531005c11b09441498
 249
 250         cprintf("</stream:features>");
 251
 252 <<<<<<< HEAD
 253
 254 =======
 255         CC->is_async = 1;               /* XMPP sessions are inherently async-capable */
 256 }
 257
 258
 259 >>>>>>> 1c0b8162b0a90f2e97028a531005c11b09441498
 260 void xmpp_xml_start(void *data, const char *supplied_el, const char **attr) {
 261         char el[256];
 262         char *sep = NULL;
 263         int i;
 264
 265         /* Axe the namespace, we don't care about it */
 266         safestrncpy(el, supplied_el, sizeof el);
 267         while (sep = strchr(el, ':'), sep) {
 268                 strcpy(el, ++sep);
 269         }
 270
 271 <<<<<<< HEAD
 272 #ifdef XMPP_DEBUG
 273         syslog(LOG_DEBUG, "XMPP ELEMENT START: <%s>\n", el);
 274         for (i=0; attr[i] != NULL; i+=2) {
 275                 syslog(LOG_DEBUG, "                    Attribute '%s' = '%s'\n", attr[i], attr[i+1]);
 276         }
 277 #endif /* XMPP_DEBUG */
 278 =======
 279         /*
 280         XMPP_syslog(LOG_DEBUG, "XMPP ELEMENT START: <%s>\n", el);
 281         for (i=0; attr[i] != NULL; i+=2) {
 282                 XMPP_syslog(LOG_DEBUG, "                    Attribute '%s' = '%s'\n", attr[i], attr[i+1]);
 283         }
 284         uncomment for more verbosity */
 285 >>>>>>> 1c0b8162b0a90f2e97028a531005c11b09441498
 286
 287         if (!strcasecmp(el, "stream")) {
 288                 xmpp_stream_start(data, supplied_el, attr);
 289         }
 290
 291         else if (!strcasecmp(el, "query")) {
 292                 XMPP->iq_query_xmlns[0] = 0;
 293                 safestrncpy(XMPP->iq_query_xmlns, supplied_el, sizeof XMPP->iq_query_xmlns);
 294 <<<<<<< HEAD
 295         }
 296
 297         else if (!strcasecmp(el, "bind")) {
 298                 XMPP->bind_requested = 1;
 299         }
 300
 301         else if (!strcasecmp(el, "iq")) {
 302                 for (i=0; attr[i] != NULL; i+=2) {
 303                         if (!strcasecmp(attr[i], "type")) {
 304                                 safestrncpy(XMPP->iq_type, attr[i+1], sizeof XMPP->iq_type);
 305                         }
 306                         else if (!strcasecmp(attr[i], "id")) {
 307                                 safestrncpy(XMPP->iq_id, attr[i+1], sizeof XMPP->iq_id);
 308                         }
 309                         else if (!strcasecmp(attr[i], "from")) {
 310                                 safestrncpy(XMPP->iq_from, attr[i+1], sizeof XMPP->iq_from);
 311                         }
 312                         else if (!strcasecmp(attr[i], "to")) {
 313                                 safestrncpy(XMPP->iq_to, attr[i+1], sizeof XMPP->iq_to);
 314                         }
 315                 }
 316         }
 317
 318         else if (!strcasecmp(el, "auth")) {
 319                 XMPP->sasl_auth_mech[0] = 0;
 320                 for (i=0; attr[i] != NULL; i+=2) {
 321                         if (!strcasecmp(attr[i], "mechanism")) {
 322                                 safestrncpy(XMPP->sasl_auth_mech, attr[i+1], sizeof XMPP->sasl_auth_mech);
 323                         }
 324                 }
 325         }
 326
 327         else if (!strcasecmp(el, "message")) {
 328                 for (i=0; attr[i] != NULL; i+=2) {
 329                         if (!strcasecmp(attr[i], "to")) {
 330                                 safestrncpy(XMPP->message_to, attr[i+1], sizeof XMPP->message_to);
 331                         }
 332                 }
 333 =======
 334         }
 335
 336         else if (!strcasecmp(el, "bind")) {
 337                 XMPP->bind_requested = 1;
 338         }
 339
 340         else if (!strcasecmp(el, "iq")) {
 341                 for (i=0; attr[i] != NULL; i+=2) {
 342                         if (!strcasecmp(attr[i], "type")) {
 343                                 safestrncpy(XMPP->iq_type, attr[i+1], sizeof XMPP->iq_type);
 344                         }
 345                         else if (!strcasecmp(attr[i], "id")) {
 346                                 safestrncpy(XMPP->iq_id, attr[i+1], sizeof XMPP->iq_id);
 347                         }
 348                         else if (!strcasecmp(attr[i], "from")) {
 349                                 safestrncpy(XMPP->iq_from, attr[i+1], sizeof XMPP->iq_from);
 350                         }
 351                         else if (!strcasecmp(attr[i], "to")) {
 352                                 safestrncpy(XMPP->iq_to, attr[i+1], sizeof XMPP->iq_to);
 353                         }
 354                 }
 355         }
 356
 357         else if (!strcasecmp(el, "auth")) {
 358                 XMPP->sasl_auth_mech[0] = 0;
 359                 for (i=0; attr[i] != NULL; i+=2) {
 360                         if (!strcasecmp(attr[i], "mechanism")) {
 361                                 safestrncpy(XMPP->sasl_auth_mech, attr[i+1], sizeof XMPP->sasl_auth_mech);
 362                         }
 363                 }
 364         }
 365
 366         else if (!strcasecmp(el, "message")) {
 367                 for (i=0; attr[i] != NULL; i+=2) {
 368                         if (!strcasecmp(attr[i], "to")) {
 369                                 safestrncpy(XMPP->message_to, attr[i+1], sizeof XMPP->message_to);
 370                         }
 371                 }
 372         }
 373
 374         else if (!strcasecmp(el, "html")) {
 375                 ++XMPP->html_tag_level;
 376         }
 377 }
 378
 379
 380
 381 void xmpp_xml_end(void *data, const char *supplied_el) {
 382         char el[256];
 383         char *sep = NULL;
 384         char xmlbuf[256];
 385
 386         /* Axe the namespace, we don't care about it */
 387         safestrncpy(el, supplied_el, sizeof el);
 388         while (sep = strchr(el, ':'), sep) {
 389                 strcpy(el, ++sep);
 390         }
 391
 392         /*
 393         XMPP_syslog(LOG_DEBUG, "XMPP ELEMENT END  : <%s>\n", el);
 394         if (XMPP->chardata_len > 0) {
 395                 XMPP_syslog(LOG_DEBUG, "          chardata: %s\n", XMPP->chardata);
 396 >>>>>>> 1c0b8162b0a90f2e97028a531005c11b09441498
 397         }
 398
 399 <<<<<<< HEAD
 400         else if (!strcasecmp(el, "html")) {
 401                 ++XMPP->html_tag_level;
 402         }
 403 }
 404
 405
 406
 407 void xmpp_xml_end(void *data, const char *supplied_el) {
 408         char el[256];
 409         char *sep = NULL;
 410         char xmlbuf[256];
 411
 412         /* Axe the namespace, we don't care about it */
 413         safestrncpy(el, supplied_el, sizeof el);
 414         while (sep = strchr(el, ':'), sep) {
 415                 strcpy(el, ++sep);
 416         }
 417
 418 #ifdef XMPP_DEBUG
 419         syslog(LOG_DEBUG, "XMPP ELEMENT END  : <%s>\n", el);
 420         if (XMPP->chardata_len > 0) {
 421                 syslog(LOG_DEBUG, "          chardata: %s\n", XMPP->chardata);
 422         }
 423 #endif /* XMPP_DEBUG */
 424
 425         if (!strcasecmp(el, "resource")) {
 426                 if (XMPP->chardata_len > 0) {
 427                         safestrncpy(XMPP->iq_client_resource, XMPP->chardata,
 428                                 sizeof XMPP->iq_client_resource);
 429                         striplt(XMPP->iq_client_resource);
 430                 }
 431         }
 432
 433         else if (!strcasecmp(el, "username")) {         /* NON SASL ONLY */
 434                 if (XMPP->chardata_len > 0) {
 435                         safestrncpy(XMPP->iq_client_username, XMPP->chardata,
 436                                 sizeof XMPP->iq_client_username);
 437                         striplt(XMPP->iq_client_username);
 438                 }
 439         }
 440
 441         else if (!strcasecmp(el, "password")) {         /* NON SASL ONLY */
 442                 if (XMPP->chardata_len > 0) {
 443                         safestrncpy(XMPP->iq_client_password, XMPP->chardata,
 444                                 sizeof XMPP->iq_client_password);
 445                         striplt(XMPP->iq_client_password);
 446                 }
 447         }
 448
 449         else if (!strcasecmp(el, "iq")) {
 450
 451 =======
 452         if (!strcasecmp(el, "resource")) {
 453                 if (XMPP->chardata_len > 0) {
 454                         safestrncpy(XMPP->iq_client_resource, XMPP->chardata,
 455                                 sizeof XMPP->iq_client_resource);
 456                         striplt(XMPP->iq_client_resource);
 457                 }
 458         }
 459
 460         else if (!strcasecmp(el, "username")) {         /* NON SASL ONLY */
 461                 if (XMPP->chardata_len > 0) {
 462                         safestrncpy(XMPP->iq_client_username, XMPP->chardata,
 463                                 sizeof XMPP->iq_client_username);
 464                         striplt(XMPP->iq_client_username);
 465                 }
 466         }
 467
 468         else if (!strcasecmp(el, "password")) {         /* NON SASL ONLY */
 469                 if (XMPP->chardata_len > 0) {
 470                         safestrncpy(XMPP->iq_client_password, XMPP->chardata,
 471                                 sizeof XMPP->iq_client_password);
 472                         striplt(XMPP->iq_client_password);
 473                 }
 474         }
 475
 476         else if (!strcasecmp(el, "iq")) {
 477
 478 >>>>>>> 1c0b8162b0a90f2e97028a531005c11b09441498
 479                 /*
 480                  * iq type="get" (handle queries)
 481                  */
 482                 if (!strcasecmp(XMPP->iq_type, "get")) {
 483
 484                         /*
 485                          * Query on a namespace
 486                          */
 487                         if (!IsEmptyStr(XMPP->iq_query_xmlns)) {
 488                                 xmpp_query_namespace(XMPP->iq_id, XMPP->iq_from,
 489                                                 XMPP->iq_to, XMPP->iq_query_xmlns);
 490                         }
 491
 492                         /*
 493                          * ping ( http://xmpp.org/extensions/xep-0199.html )
 494                          */
 495                         else if (XMPP->ping_requested) {
 496                                 cprintf("<iq type=\"result\" ");
 497                                 if (!IsEmptyStr(XMPP->iq_from)) {
 498                                         cprintf("to=\"%s\" ", xmlesc(xmlbuf, XMPP->iq_from, sizeof xmlbuf));
 499                                 }
 500                                 if (!IsEmptyStr(XMPP->iq_to)) {
 501                                         cprintf("from=\"%s\" ", xmlesc(xmlbuf, XMPP->iq_to, sizeof xmlbuf));
 502                                 }
 503                                 cprintf("id=\"%s\"/>", xmlesc(xmlbuf, XMPP->iq_id, sizeof xmlbuf));
 504                         }
 505
 506                         /*
 507                          * Unknown query ... return the XML equivalent of a blank stare
 508                          */
 509                         else {
 510 <<<<<<< HEAD
 511                                 syslog(LOG_DEBUG,
 512 =======
 513                                 XMPP_syslog(LOG_DEBUG,
 514 >>>>>>> 1c0b8162b0a90f2e97028a531005c11b09441498
 515                                             "Unknown query <%s> - returning <service-unavailable/>\n",
 516                                             el
 517                                 );
 518                                 cprintf("<iq type=\"error\" id=\"%s\">", xmlesc(xmlbuf, XMPP->iq_id, sizeof xmlbuf));
 519                                 cprintf("<error code=\"503\" type=\"cancel\">"
 520                                         "<service-unavailable xmlns=\"urn:ietf:params:xml:ns:xmpp-stanzas\"/>"
 521                                         "</error>"
 522                                 );
 523                                 cprintf("</iq>");
 524                         }
 525                 }
 526
 527                 /*
 528                  * Non SASL authentication
 529                  */
 530                 else if (
 531                         (!strcasecmp(XMPP->iq_type, "set"))
 532                         && (!strcasecmp(XMPP->iq_query_xmlns, "jabber:iq:auth:query"))
 533                         ) {
 534
 535                         xmpp_non_sasl_authenticate(
 536                                 XMPP->iq_id,
 537                                 XMPP->iq_client_username,
 538                                 XMPP->iq_client_password,
 539                                 XMPP->iq_client_resource
 540                         );
 541                 }
 542
 543                 /*
 544                  * If this <iq> stanza was a "bind" attempt, process it ...
 545                  */
 546                 else if (
 547                         (XMPP->bind_requested)
 548                         && (!IsEmptyStr(XMPP->iq_id))
 549                         && (!IsEmptyStr(XMPP->iq_client_resource))
 550                         && (CC->logged_in)
 551                         ) {
 552
 553                         /* Generate the "full JID" of the client resource */
 554
 555                         snprintf(XMPP->client_jid, sizeof XMPP->client_jid,
 556                                 "%s/%s",
 557                                 CC->cs_inet_email,
 558                                 XMPP->iq_client_resource
 559                         );
 560
 561                         /* Tell the client what its JID is */
 562
 563                         cprintf("<iq type=\"result\" id=\"%s\">", xmlesc(xmlbuf, XMPP->iq_id, sizeof xmlbuf));
 564                         cprintf("<bind xmlns=\"urn:ietf:params:xml:ns:xmpp-bind\">");
 565                         cprintf("<jid>%s</jid>", xmlesc(xmlbuf, XMPP->client_jid, sizeof xmlbuf));
 566                         cprintf("</bind>");
 567                         cprintf("</iq>");
 568                 }
 569
 570                 else if (XMPP->iq_session) {
 571                         cprintf("<iq type=\"result\" id=\"%s\">", xmlesc(xmlbuf, XMPP->iq_id, sizeof xmlbuf));
 572                         cprintf("</iq>");
 573                 }
 574
 575                 else {
 576                         cprintf("<iq type=\"error\" id=\"%s\">", xmlesc(xmlbuf, XMPP->iq_id, sizeof xmlbuf));
 577                         cprintf("<error>Don't know howto do '%s'!</error>", xmlesc(xmlbuf, XMPP->iq_type, sizeof xmlbuf));
 578                         cprintf("</iq>");
 579                 }
 580
 581                 /* Now clear these fields out so they don't get used by a future stanza */
 582                 XMPP->iq_id[0] = 0;
 583                 XMPP->iq_from[0] = 0;
 584                 XMPP->iq_to[0] = 0;
 585                 XMPP->iq_type[0] = 0;
 586                 XMPP->iq_client_resource[0] = 0;
 587                 XMPP->iq_session = 0;
 588                 XMPP->iq_query_xmlns[0] = 0;
 589                 XMPP->bind_requested = 0;
 590                 XMPP->ping_requested = 0;
 591         }
 592
 593         else if (!strcasecmp(el, "auth")) {
 594
 595                 /* Try to authenticate (this function is responsible for the output stanza) */
 596                 xmpp_sasl_auth(XMPP->sasl_auth_mech, (XMPP->chardata != NULL ? XMPP->chardata : "") );
 597
 598                 /* Now clear these fields out so they don't get used by a future stanza */
 599                 XMPP->sasl_auth_mech[0] = 0;
 600         }
 601
 602         else if (!strcasecmp(el, "session")) {
 603                 XMPP->iq_session = 1;
 604         }
 605
 606         else if (!strcasecmp(el, "presence")) {
 607
 608                 /* Respond to a <presence> update by firing back with presence information
 609                  * on the entire wholist.  Check this assumption, it's probably wrong.
 610                  */
 611                 xmpp_wholist_presence_dump();
 612         }
 613
 614         else if ( (!strcasecmp(el, "body")) && (XMPP->html_tag_level == 0) ) {
 615                 if (XMPP->message_body != NULL) {
 616                         free(XMPP->message_body);
 617                         XMPP->message_body = NULL;
 618                 }
 619                 if (XMPP->chardata_len > 0) {
 620                         XMPP->message_body = strdup(XMPP->chardata);
 621                 }
 622         }
 623
 624         else if (!strcasecmp(el, "message")) {
 625                 xmpp_send_message(XMPP->message_to, XMPP->message_body);
 626                 XMPP->html_tag_level = 0;
 627         }
 628
 629         else if (!strcasecmp(el, "html")) {
 630                 --XMPP->html_tag_level;
 631         }
 632
 633         else if (!strcasecmp(el, "starttls")) {
 634 #ifdef HAVE_OPENSSL
 635                 cprintf("<proceed xmlns='urn:ietf:params:xml:ns:xmpp-tls'/>");
 636                 CtdlModuleStartCryptoMsgs(NULL, NULL, NULL);
 637                 if (!CC->redirect_ssl) CC->kill_me = KILLME_NO_CRYPTO;
 638 #else
 639                 cprintf("<failure xmlns='urn:ietf:params:xml:ns:xmpp-tls'/>");
 640                 CC->kill_me = KILLME_NO_CRYPTO;
 641 #endif
 642         }
 643
 644         else if (!strcasecmp(el, "ping")) {
 645                 XMPP->ping_requested = 1;
 646 <<<<<<< HEAD
 647         }
 648
 649         else if (!strcasecmp(el, "stream")) {
 650                 syslog(LOG_DEBUG, "XMPP client shut down their stream\n");
 651                 xmpp_massacre_roster();
 652                 cprintf("</stream>\n");
 653                 CC->kill_me = KILLME_CLIENT_LOGGED_OUT;
 654         }
 655
 656         else if (!strcasecmp(el, "query")) {
 657                 // no action required here, we picked up the xmlns= parameter during xmpp_xml_start()
 658         }
 659
 660         else {
 661                 syslog(LOG_DEBUG, "Ignoring unknown tag <%s>\n", el);
 662 =======
 663         }
 664
 665         else if (!strcasecmp(el, "stream")) {
 666                 XMPPM_syslog(LOG_DEBUG, "XMPP client shut down their stream\n");
 667                 xmpp_massacre_roster();
 668                 cprintf("</stream>\n");
 669                 CC->kill_me = KILLME_CLIENT_LOGGED_OUT;
 670         }
 671
 672         else {
 673                 XMPP_syslog(LOG_DEBUG, "Ignoring unknown tag <%s>\n", el);
 674 >>>>>>> 1c0b8162b0a90f2e97028a531005c11b09441498
 675         }
 676
 677         XMPP->chardata_len = 0;
 678         if (XMPP->chardata_alloc > 0) {
 679                 XMPP->chardata[0] = 0;
 680         }
 681 }
 682
 683
 684 void xmpp_xml_chardata(void *data, const XML_Char *s, int len)
 685 {
 686         citxmpp *X = XMPP;
 687
 688         if (X->chardata_alloc == 0) {
 689                 X->chardata_alloc = SIZ;
 690                 X->chardata = malloc(X->chardata_alloc);
 691         }
 692         if ((X->chardata_len + len + 1) > X->chardata_alloc) {
 693                 X->chardata_alloc = X->chardata_len + len + 1024;
 694                 X->chardata = realloc(X->chardata, X->chardata_alloc);
 695         }
 696         memcpy(&X->chardata[X->chardata_len], s, len);
 697         X->chardata_len += len;
 698         X->chardata[X->chardata_len] = 0;
 699 }
 700
 701
 702 /*
 703  * This cleanup function blows away the temporary memory and files used by the XMPP service.
 704  */
 705 void xmpp_cleanup_function(void) {
 706
 707         /* Don't do this stuff if this is not a XMPP session! */
 708         if (CC->h_command_function != xmpp_command_loop) return;
 709
 710         if (XMPP->chardata != NULL) {
 711                 free(XMPP->chardata);
 712                 XMPP->chardata = NULL;
 713                 XMPP->chardata_len = 0;
 714                 XMPP->chardata_alloc = 0;
 715                 if (XMPP->message_body != NULL) {
 716                         free(XMPP->message_body);
 717                 }
 718         }
 719         XML_ParserFree(XMPP->xp);
 720         free(XMPP);
 721 }
 722
 723
 724
 725 /*
 726  * Here's where our XMPP session begins its happy day.
 727  */
 728 void xmpp_greeting(void) {
 729         client_set_inbound_buf(4);
 730         strcpy(CC->cs_clientname, "XMPP session");
 731         CC->session_specific_data = malloc(sizeof(citxmpp));
 732         memset(XMPP, 0, sizeof(citxmpp));
 733         XMPP->last_event_processed = queue_event_seq;
 734
 735         /* XMPP does not use a greeting, but we still have to initialize some things. */
 736
 737         XMPP->xp = XML_ParserCreateNS("UTF-8", ':');
 738         if (XMPP->xp == NULL) {
 739                 syslog(LOG_ALERT, "Cannot create XML parser!\n");
 740                 CC->kill_me = KILLME_XML_PARSER;
 741                 return;
 742         }
 743
 744         XML_SetElementHandler(XMPP->xp, xmpp_xml_start, xmpp_xml_end);
 745         XML_SetCharacterDataHandler(XMPP->xp, xmpp_xml_chardata);
 746         // XML_SetUserData(XMPP->xp, something...);
 747
 748         /* Prevent the "billion laughs" attack against expat by disabling
 749          * internal entity expansion.  With 2.x, forcibly stop the parser
 750          * if an entity is declared - this is safer and a more obvious
 751          * failure mode.  With older versions, simply prevent expansion
 752          * of such entities. */
 753 #ifdef HAVE_XML_STOPPARSER
 754         XML_SetEntityDeclHandler(XMPP->xp, xmpp_entity_declaration);
 755 #else
 756         XML_SetDefaultHandler(XMPP->xp, NULL);
 757 #endif
 758
 759         CC->can_receive_im = 1;         /* This protocol is capable of receiving instant messages */
 760 }
 761
 762
 763 /*
 764  * Main command loop for XMPP sessions.
 765  */
 766 void xmpp_command_loop(void) {
 767         int rc;
 768         StrBuf *stream_input = NewStrBuf();
 769
 770         time(&CC->lastcmd);
 771         rc = client_read_random_blob(stream_input, 30);
 772         if (rc > 0) {
 773                 syslog(LOG_DEBUG, "\033[32m%s\033[0m", ChrPtr(stream_input));
 774                 XML_Parse(XMPP->xp, ChrPtr(stream_input), rc, 0);
 775         }
 776         else {
 777                 syslog(LOG_ERR, "client disconnected: ending session.\n");
 778                 CC->kill_me = KILLME_CLIENT_DISCONNECTED;
 779         }
 780         FreeStrBuf(&stream_input);
 781 }
 782
 783
 784 /*
 785  * Async loop for XMPP sessions (handles the transmission of unsolicited stanzas)
 786  */
 787 void xmpp_async_loop(void) {
 788         xmpp_process_events();
 789         xmpp_output_incoming_messages();
 790 }
 791
 792
 793 /*
 794  * Login hook for XMPP sessions
 795  */
 796 void xmpp_login_hook(void) {
 797         xmpp_queue_event(XMPP_EVT_LOGIN, CC->cs_inet_email);
 798 }
 799
 800
 801 /*
 802  * Logout hook for XMPP sessions
 803  */
 804 void xmpp_logout_hook(void) {
 805         xmpp_queue_event(XMPP_EVT_LOGOUT, CC->cs_inet_email);
 806 }
 807
 808
 809 void LogXMPPSrvDebugEnable(const int n)
 810 {
 811         XMPPSrvDebugEnable = n;
 812 }
 813 const char *CitadelServiceXMPP="XMPP";
 814 extern void xmpp_cleanup_events(void);
 815 CTDL_MODULE_INIT(xmpp)
 816 {
 817         if (!threading) {
 818                 CtdlRegisterServiceHook(config.c_xmpp_c2s_port,
 819                                         NULL,
 820                                         xmpp_greeting,
 821                                         xmpp_command_loop,
 822                                         xmpp_async_loop,
 823                                         CitadelServiceXMPP
 824                 );
 825                 CtdlRegisterDebugFlagHook(HKEY("serv_xmpp"), LogXMPPSrvDebugEnable, &XMPPSrvDebugEnable);
 826                 CtdlRegisterSessionHook(xmpp_cleanup_function, EVT_STOP, PRIO_STOP + 70);
 827                 CtdlRegisterSessionHook(xmpp_login_hook, EVT_LOGIN, PRIO_LOGIN + 90);
 828                 CtdlRegisterSessionHook(xmpp_logout_hook, EVT_LOGOUT, PRIO_LOGOUT + 90);
 829                 CtdlRegisterSessionHook(xmpp_login_hook, EVT_UNSTEALTH, PRIO_UNSTEALTH + 1);
 830                 CtdlRegisterSessionHook(xmpp_logout_hook, EVT_STEALTH, PRIO_STEALTH + 1);
 831                 CtdlRegisterCleanupHook(xmpp_cleanup_events);
 832
 833         }
 834
 835         /* return our module name for the log */
 836         return "xmpp";
 837 }