4 * XMPP (Jabber) service for the Citadel system
5 * Copyright (c) 2007 by Art Cancro
6 * This code is released under the terms of the GNU General Public License.
18 #include <sys/types.h>
20 #if TIME_WITH_SYS_TIME
21 # include <sys/time.h>
25 # include <sys/time.h>
35 #include <libcitadel.h>
39 #include "citserver.h"
47 #include "internet_addressing.h"
49 #include "ctdl_module.h"
50 #include "serv_xmpp.h"
52 struct xmpp_event *xmpp_queue = NULL;
54 /* We have just received a <stream> tag from the client, so send them ours */
56 void xmpp_stream_start(void *data, const char *supplied_el, const char **attr)
58 CtdlLogPrintf(CTDL_DEBUG, "New XMPP stream.\n");
61 if (!strcasecmp(attr[0], "to")) {
62 safestrncpy(XMPP->server_name, attr[1], sizeof XMPP->server_name);
67 cprintf("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
69 cprintf("<stream:stream ");
70 cprintf("from=\"%s\" ", XMPP->server_name);
71 cprintf("id=\"%08x\" ", CC->cs_pid);
72 cprintf("version=\"1.0\" ");
73 cprintf("xmlns:stream=\"http://etherx.jabber.org/streams\" ");
74 cprintf("xmlns=\"jabber:client\">");
76 /* The features of this stream are... */
77 cprintf("<stream:features>");
79 #ifdef HAVE_OPENSSL_XXXX_COMMENTED_OUT
80 /* TLS encryption (but only if it isn't already active) */
81 if (!CC->redirect_ssl) {
82 cprintf("<starttls xmlns='urn:ietf:params:xml:ns:xmpp-tls'></starttls>");
87 /* If we're not logged in yet, offer SASL as our feature set */
88 xmpp_output_auth_mechs();
90 /* Also offer non-SASL authentication */
91 cprintf("<auth xmlns=\"http://jabber.org/features/iq-auth\"/>");
94 /* Offer binding and sessions as part of our feature set */
95 cprintf("<bind xmlns=\"urn:ietf:params:xml:ns:xmpp-bind\"/>");
96 cprintf("<session xmlns=\"urn:ietf:params:xml:ns:xmpp-session\"/>");
98 cprintf("</stream:features>");
100 CC->is_async = 1; /* XMPP sessions are inherently async-capable */
104 void xmpp_xml_start(void *data, const char *supplied_el, const char **attr) {
109 /* Axe the namespace, we don't care about it */
110 safestrncpy(el, supplied_el, sizeof el);
111 while (sep = strchr(el, ':'), sep) {
115 CtdlLogPrintf(CTDL_DEBUG, "XMPP ELEMENT START: <%s>\n", el);
117 for (i=0; attr[i] != NULL; i+=2) {
118 CtdlLogPrintf(CTDL_DEBUG, " Attribute '%s' = '%s'\n", attr[i], attr[i+1]);
121 if (!strcasecmp(el, "stream")) {
122 xmpp_stream_start(data, supplied_el, attr);
125 else if (!strcasecmp(el, "query")) {
126 XMPP->iq_query_xmlns[0] = 0;
127 safestrncpy(XMPP->iq_query_xmlns, supplied_el, sizeof XMPP->iq_query_xmlns);
130 else if (!strcasecmp(el, "bind")) {
131 XMPP->bind_requested = 1;
134 else if (!strcasecmp(el, "iq")) {
135 for (i=0; attr[i] != NULL; i+=2) {
136 if (!strcasecmp(attr[i], "type")) {
137 safestrncpy(XMPP->iq_type, attr[i+1], sizeof XMPP->iq_type);
139 else if (!strcasecmp(attr[i], "id")) {
140 safestrncpy(XMPP->iq_id, attr[i+1], sizeof XMPP->iq_id);
142 else if (!strcasecmp(attr[i], "from")) {
143 safestrncpy(XMPP->iq_from, attr[i+1], sizeof XMPP->iq_from);
145 else if (!strcasecmp(attr[i], "to")) {
146 safestrncpy(XMPP->iq_to, attr[i+1], sizeof XMPP->iq_to);
151 else if (!strcasecmp(el, "auth")) {
152 XMPP->sasl_auth_mech[0] = 0;
153 for (i=0; attr[i] != NULL; i+=2) {
154 if (!strcasecmp(attr[i], "mechanism")) {
155 safestrncpy(XMPP->sasl_auth_mech, attr[i+1], sizeof XMPP->sasl_auth_mech);
160 else if (!strcasecmp(el, "message")) {
161 for (i=0; attr[i] != NULL; i+=2) {
162 if (!strcasecmp(attr[i], "to")) {
163 safestrncpy(XMPP->message_to, attr[i+1], sizeof XMPP->message_to);
168 else if (!strcasecmp(el, "html")) {
169 ++XMPP->html_tag_level;
175 void xmpp_xml_end(void *data, const char *supplied_el) {
179 /* Axe the namespace, we don't care about it */
180 safestrncpy(el, supplied_el, sizeof el);
181 while (sep = strchr(el, ':'), sep) {
185 CtdlLogPrintf(CTDL_DEBUG, "XMPP ELEMENT END : <%s>\n", el);
186 if (XMPP->chardata_len > 0) {
187 CtdlLogPrintf(CTDL_DEBUG, " chardata: %s\n", XMPP->chardata);
190 if (!strcasecmp(el, "resource")) {
191 if (XMPP->chardata_len > 0) {
192 safestrncpy(XMPP->iq_client_resource, XMPP->chardata,
193 sizeof XMPP->iq_client_resource);
194 striplt(XMPP->iq_client_resource);
198 if (!strcasecmp(el, "username")) { /* NON SASL ONLY */
199 if (XMPP->chardata_len > 0) {
200 safestrncpy(XMPP->iq_client_username, XMPP->chardata,
201 sizeof XMPP->iq_client_username);
202 striplt(XMPP->iq_client_username);
206 if (!strcasecmp(el, "password")) { /* NON SASL ONLY */
207 if (XMPP->chardata_len > 0) {
208 safestrncpy(XMPP->iq_client_password, XMPP->chardata,
209 sizeof XMPP->iq_client_password);
210 striplt(XMPP->iq_client_password);
214 else if (!strcasecmp(el, "iq")) {
217 * iq type="get" (handle queries)
219 if (!strcasecmp(XMPP->iq_type, "get")) {
222 * Query on a namespace
224 if (!IsEmptyStr(XMPP->iq_query_xmlns)) {
225 xmpp_query_namespace(XMPP->iq_id, XMPP->iq_from,
226 XMPP->iq_to, XMPP->iq_query_xmlns);
230 * Unknown queries ... return the XML equivalent of a blank stare
233 cprintf("<iq type=\"result\" id=\"%s\">", XMPP->iq_id);
239 * Non SASL authentication
242 (!strcasecmp(XMPP->iq_type, "set"))
243 && (!strcasecmp(XMPP->iq_query_xmlns, "jabber:iq:auth:query"))
246 jabber_non_sasl_authenticate(
248 XMPP->iq_client_username,
249 XMPP->iq_client_password,
250 XMPP->iq_client_resource
255 * If this <iq> stanza was a "bind" attempt, process it ...
258 (XMPP->bind_requested)
259 && (!IsEmptyStr(XMPP->iq_id))
260 && (!IsEmptyStr(XMPP->iq_client_resource))
264 /* Generate the "full JID" of the client resource */
266 snprintf(XMPP->client_jid, sizeof XMPP->client_jid,
269 XMPP->iq_client_resource
272 /* Tell the client what its JID is */
274 cprintf("<iq type=\"result\" id=\"%s\">", XMPP->iq_id);
275 cprintf("<bind xmlns=\"urn:ietf:params:xml:ns:xmpp-bind\">");
276 cprintf("<jid>%s</jid>", XMPP->client_jid);
281 else if (XMPP->iq_session) {
282 cprintf("<iq type=\"result\" id=\"%s\">", XMPP->iq_id);
287 cprintf("<iq type=\"error\" id=\"%s\">", XMPP->iq_id);
288 cprintf("<error></error>");
292 /* Now clear these fields out so they don't get used by a future stanza */
294 XMPP->iq_from[0] = 0;
296 XMPP->iq_type[0] = 0;
297 XMPP->iq_client_resource[0] = 0;
298 XMPP->iq_session = 0;
299 XMPP->iq_query_xmlns[0] = 0;
300 XMPP->bind_requested = 0;
303 else if (!strcasecmp(el, "auth")) {
305 /* Try to authenticate (this function is responsible for the output stanza) */
306 xmpp_sasl_auth(XMPP->sasl_auth_mech, (XMPP->chardata != NULL ? XMPP->chardata : "") );
308 /* Now clear these fields out so they don't get used by a future stanza */
309 XMPP->sasl_auth_mech[0] = 0;
312 else if (!strcasecmp(el, "session")) {
313 XMPP->iq_session = 1;
316 else if (!strcasecmp(el, "presence")) {
318 /* Respond to a <presence> update by firing back with presence information
319 * on the entire wholist. Check this assumption, it's probably wrong.
321 jabber_wholist_presence_dump();
324 else if ( (!strcasecmp(el, "body")) && (XMPP->html_tag_level == 0) ) {
325 if (XMPP->message_body != NULL) {
326 free(XMPP->message_body);
327 XMPP->message_body = NULL;
329 if (XMPP->chardata_len > 0) {
330 XMPP->message_body = strdup(XMPP->chardata);
334 else if (!strcasecmp(el, "message")) {
335 jabber_send_message(XMPP->message_to, XMPP->message_body);
336 XMPP->html_tag_level = 0;
339 else if (!strcasecmp(el, "html")) {
340 --XMPP->html_tag_level;
343 else if (!strcasecmp(el, "starttls")) {
345 cprintf("<proceed xmlns='urn:ietf:params:xml:ns:xmpp-tls'/>");
346 CtdlModuleStartCryptoMsgs(NULL, NULL, NULL);
347 if (!CC->redirect_ssl) CC->kill_me = 1;
349 cprintf("<failure xmlns='urn:ietf:params:xml:ns:xmpp-tls'/>");
354 XMPP->chardata_len = 0;
355 if (XMPP->chardata_alloc > 0) {
356 XMPP->chardata[0] = 0;
361 void xmpp_xml_chardata(void *data, const XML_Char *s, int len)
363 struct citxmpp *X = XMPP;
365 if (X->chardata_alloc == 0) {
366 X->chardata_alloc = SIZ;
367 X->chardata = malloc(X->chardata_alloc);
369 if ((X->chardata_len + len + 1) > X->chardata_alloc) {
370 X->chardata_alloc = X->chardata_len + len + 1024;
371 X->chardata = realloc(X->chardata, X->chardata_alloc);
373 memcpy(&X->chardata[X->chardata_len], s, len);
374 X->chardata_len += len;
375 X->chardata[X->chardata_len] = 0;
380 * This cleanup function blows away the temporary memory and files used by the XMPP service.
382 void xmpp_cleanup_function(void) {
384 /* Don't do this stuff if this is not a XMPP session! */
385 if (CC->h_command_function != xmpp_command_loop) return;
387 CtdlLogPrintf(CTDL_DEBUG, "Performing XMPP cleanup hook\n");
388 if (XMPP->chardata != NULL) {
389 free(XMPP->chardata);
390 XMPP->chardata = NULL;
391 XMPP->chardata_len = 0;
392 XMPP->chardata_alloc = 0;
393 if (XMPP->message_body != NULL) {
394 free(XMPP->message_body);
397 XML_ParserFree(XMPP->xp);
404 * Here's where our XMPP session begins its happy day.
406 void xmpp_greeting(void) {
407 strcpy(CC->cs_clientname, "Jabber session");
408 CC->session_specific_data = malloc(sizeof(struct citxmpp));
409 memset(XMPP, 0, sizeof(struct citxmpp));
410 XMPP->last_event_processed = queue_event_seq;
412 /* XMPP does not use a greeting, but we still have to initialize some things. */
414 XMPP->xp = XML_ParserCreateNS("UTF-8", ':');
415 if (XMPP->xp == NULL) {
416 CtdlLogPrintf(CTDL_ALERT, "Cannot create XML parser!\n");
421 XML_SetElementHandler(XMPP->xp, xmpp_xml_start, xmpp_xml_end);
422 XML_SetCharacterDataHandler(XMPP->xp, xmpp_xml_chardata);
423 // XML_SetUserData(XMPP->xp, something...);
428 * Main command loop for XMPP sessions.
430 void xmpp_command_loop(void) {
435 memset(cmdbuf, 0, sizeof cmdbuf); /* Clear it, just in case */
436 retval = client_read(cmdbuf, 1);
438 CtdlLogPrintf(CTDL_ERR, "Client disconnected: ending session.\r\n");
443 /* FIXME ... this is woefully inefficient. */
445 XML_Parse(XMPP->xp, cmdbuf, 1, 0);
450 * Async loop for XMPP sessions (handles the transmission of unsolicited stanzas)
452 void xmpp_async_loop(void) {
453 xmpp_process_events();
454 jabber_output_incoming_messages();
459 * Login hook for XMPP sessions
461 void xmpp_login_hook(void) {
462 xmpp_queue_event(XMPP_EVT_LOGIN, CC->cs_inet_email);
467 * Logout hook for XMPP sessions
469 void xmpp_logout_hook(void) {
470 xmpp_queue_event(XMPP_EVT_LOGOUT, CC->cs_inet_email);
474 const char *CitadelServiceXMPP="XMPP";
476 CTDL_MODULE_INIT(jabber)
479 CtdlRegisterServiceHook(config.c_xmpp_c2s_port,
485 CtdlRegisterSessionHook(xmpp_cleanup_function, EVT_STOP);
486 CtdlRegisterSessionHook(xmpp_login_hook, EVT_LOGIN);
487 CtdlRegisterSessionHook(xmpp_logout_hook, EVT_LOGOUT);
488 CtdlRegisterSessionHook(xmpp_login_hook, EVT_UNSTEALTH);
489 CtdlRegisterSessionHook(xmpp_logout_hook, EVT_STEALTH);
492 /* return our Subversion id for the Log */