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>
38 #include "citserver.h"
46 #include "internet_addressing.h"
48 #include "ctdl_module.h"
52 #include "serv_xmpp.h"
54 struct xmpp_event *xmpp_queue = NULL;
56 /* We have just received a <stream> tag from the client, so send them ours */
58 void xmpp_stream_start(void *data, const char *supplied_el, const char **attr)
60 lprintf(CTDL_DEBUG, "New XMPP stream.\n");
63 if (!strcasecmp(attr[0], "to")) {
64 safestrncpy(XMPP->server_name, attr[1], sizeof XMPP->server_name);
69 cprintf("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
71 cprintf("<stream:stream ");
72 cprintf("from=\"%s\" ", XMPP->server_name);
73 cprintf("id=\"%08x\" ", CC->cs_pid);
74 cprintf("version=\"1.0\" ");
75 cprintf("xmlns:stream=\"http://etherx.jabber.org/streams\" ");
76 cprintf("xmlns=\"jabber:client\">");
78 /* The features of this stream are... */
79 cprintf("<stream:features>");
81 #ifdef HAVE_OPENSSL_XXXX_COMMENTED_OUT
82 /* TLS encryption (but only if it isn't already active) */
83 if (!CC->redirect_ssl) {
84 cprintf("<starttls xmlns='urn:ietf:params:xml:ns:xmpp-tls'></starttls>");
89 /* If we're not logged in yet, offer SASL as our feature set */
90 xmpp_output_auth_mechs();
92 /* Also offer non-SASL authentication */
93 cprintf("<auth xmlns=\"http://jabber.org/features/iq-auth\"/>");
96 /* Offer binding and sessions as part of our feature set */
97 cprintf("<bind xmlns=\"urn:ietf:params:xml:ns:xmpp-bind\"/>");
98 cprintf("<session xmlns=\"urn:ietf:params:xml:ns:xmpp-session\"/>");
100 cprintf("</stream:features>");
102 CC->is_async = 1; /* XMPP sessions are inherently async-capable */
106 void xmpp_xml_start(void *data, const char *supplied_el, const char **attr) {
111 /* Axe the namespace, we don't care about it */
112 safestrncpy(el, supplied_el, sizeof el);
113 while (sep = strchr(el, ':'), sep) {
117 lprintf(CTDL_DEBUG, "XMPP ELEMENT START: <%s>\n", el);
119 for (i=0; attr[i] != NULL; i+=2) {
120 lprintf(CTDL_DEBUG, " Attribute '%s' = '%s'\n", attr[i], attr[i+1]);
123 if (!strcasecmp(el, "stream")) {
124 xmpp_stream_start(data, supplied_el, attr);
127 else if (!strcasecmp(el, "query")) {
128 XMPP->iq_query_xmlns[0] = 0;
129 safestrncpy(XMPP->iq_query_xmlns, supplied_el, sizeof XMPP->iq_query_xmlns);
132 else if (!strcasecmp(el, "bind")) {
133 XMPP->bind_requested = 1;
136 else if (!strcasecmp(el, "iq")) {
137 for (i=0; attr[i] != NULL; i+=2) {
138 if (!strcasecmp(attr[i], "type")) {
139 safestrncpy(XMPP->iq_type, attr[i+1], sizeof XMPP->iq_type);
141 else if (!strcasecmp(attr[i], "id")) {
142 safestrncpy(XMPP->iq_id, attr[i+1], sizeof XMPP->iq_id);
144 else if (!strcasecmp(attr[i], "from")) {
145 safestrncpy(XMPP->iq_from, attr[i+1], sizeof XMPP->iq_from);
147 else if (!strcasecmp(attr[i], "to")) {
148 safestrncpy(XMPP->iq_to, attr[i+1], sizeof XMPP->iq_to);
153 else if (!strcasecmp(el, "auth")) {
154 XMPP->sasl_auth_mech[0] = 0;
155 for (i=0; attr[i] != NULL; i+=2) {
156 if (!strcasecmp(attr[i], "mechanism")) {
157 safestrncpy(XMPP->sasl_auth_mech, attr[i+1], sizeof XMPP->sasl_auth_mech);
162 else if (!strcasecmp(el, "message")) {
163 for (i=0; attr[i] != NULL; i+=2) {
164 if (!strcasecmp(attr[i], "to")) {
165 safestrncpy(XMPP->message_to, attr[i+1], sizeof XMPP->message_to);
170 else if (!strcasecmp(el, "html")) {
171 ++XMPP->html_tag_level;
177 void xmpp_xml_end(void *data, const char *supplied_el) {
181 /* Axe the namespace, we don't care about it */
182 safestrncpy(el, supplied_el, sizeof el);
183 while (sep = strchr(el, ':'), sep) {
187 lprintf(CTDL_DEBUG, "XMPP ELEMENT END : <%s>\n", el);
188 if (XMPP->chardata_len > 0) {
189 lprintf(CTDL_DEBUG, " chardata: %s\n", XMPP->chardata);
192 if (!strcasecmp(el, "resource")) {
193 if (XMPP->chardata_len > 0) {
194 safestrncpy(XMPP->iq_client_resource, XMPP->chardata,
195 sizeof XMPP->iq_client_resource);
196 striplt(XMPP->iq_client_resource);
200 if (!strcasecmp(el, "username")) { /* NON SASL ONLY */
201 if (XMPP->chardata_len > 0) {
202 safestrncpy(XMPP->iq_client_username, XMPP->chardata,
203 sizeof XMPP->iq_client_username);
204 striplt(XMPP->iq_client_username);
208 if (!strcasecmp(el, "password")) { /* NON SASL ONLY */
209 if (XMPP->chardata_len > 0) {
210 safestrncpy(XMPP->iq_client_password, XMPP->chardata,
211 sizeof XMPP->iq_client_password);
212 striplt(XMPP->iq_client_password);
216 else if (!strcasecmp(el, "iq")) {
219 * iq type="get" (handle queries)
221 if (!strcasecmp(XMPP->iq_type, "get")) {
224 * Query on a namespace
226 if (!IsEmptyStr(XMPP->iq_query_xmlns)) {
227 xmpp_query_namespace(XMPP->iq_id, XMPP->iq_from,
228 XMPP->iq_to, XMPP->iq_query_xmlns);
232 * Unknown queries ... return the XML equivalent of a blank stare
235 cprintf("<iq type=\"result\" id=\"%s\">", XMPP->iq_id);
241 * Non SASL authentication
244 (!strcasecmp(XMPP->iq_type, "set"))
245 && (!strcasecmp(XMPP->iq_query_xmlns, "jabber:iq:auth:query"))
248 jabber_non_sasl_authenticate(
250 XMPP->iq_client_username,
251 XMPP->iq_client_password,
252 XMPP->iq_client_resource
257 * If this <iq> stanza was a "bind" attempt, process it ...
260 (XMPP->bind_requested)
261 && (!IsEmptyStr(XMPP->iq_id))
262 && (!IsEmptyStr(XMPP->iq_client_resource))
266 /* Generate the "full JID" of the client resource */
268 snprintf(XMPP->client_jid, sizeof XMPP->client_jid,
271 XMPP->iq_client_resource
274 /* Tell the client what its JID is */
276 cprintf("<iq type=\"result\" id=\"%s\">", XMPP->iq_id);
277 cprintf("<bind xmlns=\"urn:ietf:params:xml:ns:xmpp-bind\">");
278 cprintf("<jid>%s</jid>", XMPP->client_jid);
283 else if (XMPP->iq_session) {
284 cprintf("<iq type=\"result\" id=\"%s\">", XMPP->iq_id);
289 cprintf("<iq type=\"error\" id=\"%s\">", XMPP->iq_id);
290 cprintf("<error></error>");
294 /* Now clear these fields out so they don't get used by a future stanza */
296 XMPP->iq_from[0] = 0;
298 XMPP->iq_type[0] = 0;
299 XMPP->iq_client_resource[0] = 0;
300 XMPP->iq_session = 0;
301 XMPP->iq_query_xmlns[0] = 0;
302 XMPP->bind_requested = 0;
305 else if (!strcasecmp(el, "auth")) {
307 /* Try to authenticate (this function is responsible for the output stanza) */
308 xmpp_sasl_auth(XMPP->sasl_auth_mech, (XMPP->chardata != NULL ? XMPP->chardata : "") );
310 /* Now clear these fields out so they don't get used by a future stanza */
311 XMPP->sasl_auth_mech[0] = 0;
314 else if (!strcasecmp(el, "session")) {
315 XMPP->iq_session = 1;
318 else if (!strcasecmp(el, "presence")) {
320 /* Respond to a <presence> update by firing back with presence information
321 * on the entire wholist. Check this assumption, it's probably wrong.
323 jabber_wholist_presence_dump();
326 else if ( (!strcasecmp(el, "body")) && (XMPP->html_tag_level == 0) ) {
327 if (XMPP->message_body != NULL) {
328 free(XMPP->message_body);
329 XMPP->message_body = NULL;
331 if (XMPP->chardata_len > 0) {
332 XMPP->message_body = strdup(XMPP->chardata);
336 else if (!strcasecmp(el, "message")) {
337 jabber_send_message(XMPP->message_to, XMPP->message_body);
338 XMPP->html_tag_level = 0;
341 else if (!strcasecmp(el, "html")) {
342 --XMPP->html_tag_level;
345 else if (!strcasecmp(el, "starttls")) {
347 cprintf("<proceed xmlns='urn:ietf:params:xml:ns:xmpp-tls'/>");
348 CtdlModuleStartCryptoMsgs(NULL, NULL, NULL);
349 if (!CC->redirect_ssl) CC->kill_me = 1;
351 cprintf("<failure xmlns='urn:ietf:params:xml:ns:xmpp-tls'/>");
356 XMPP->chardata_len = 0;
357 if (XMPP->chardata_alloc > 0) {
358 XMPP->chardata[0] = 0;
363 void xmpp_xml_chardata(void *data, const XML_Char *s, int len)
365 struct citxmpp *X = XMPP;
367 if (X->chardata_alloc == 0) {
368 X->chardata_alloc = SIZ;
369 X->chardata = malloc(X->chardata_alloc);
371 if ((X->chardata_len + len + 1) > X->chardata_alloc) {
372 X->chardata_alloc = X->chardata_len + len + 1024;
373 X->chardata = realloc(X->chardata, X->chardata_alloc);
375 memcpy(&X->chardata[X->chardata_len], s, len);
376 X->chardata_len += len;
377 X->chardata[X->chardata_len] = 0;
382 * This cleanup function blows away the temporary memory and files used by the XMPP service.
384 void xmpp_cleanup_function(void) {
386 /* Don't do this stuff if this is not a XMPP session! */
387 if (CC->h_command_function != xmpp_command_loop) return;
389 lprintf(CTDL_DEBUG, "Performing XMPP cleanup hook\n");
390 if (XMPP->chardata != NULL) {
391 free(XMPP->chardata);
392 XMPP->chardata = NULL;
393 XMPP->chardata_len = 0;
394 XMPP->chardata_alloc = 0;
395 if (XMPP->message_body != NULL) {
396 free(XMPP->message_body);
399 XML_ParserFree(XMPP->xp);
406 * Here's where our XMPP session begins its happy day.
408 void xmpp_greeting(void) {
409 strcpy(CC->cs_clientname, "Jabber session");
410 CC->session_specific_data = malloc(sizeof(struct citxmpp));
411 memset(XMPP, 0, sizeof(struct citxmpp));
412 XMPP->last_event_processed = queue_event_seq;
414 /* XMPP does not use a greeting, but we still have to initialize some things. */
416 XMPP->xp = XML_ParserCreateNS("UTF-8", ':');
417 if (XMPP->xp == NULL) {
418 lprintf(CTDL_ALERT, "Cannot create XML parser!\n");
423 XML_SetElementHandler(XMPP->xp, xmpp_xml_start, xmpp_xml_end);
424 XML_SetCharacterDataHandler(XMPP->xp, xmpp_xml_chardata);
425 // XML_SetUserData(XMPP->xp, something...);
430 * Main command loop for XMPP sessions.
432 void xmpp_command_loop(void) {
437 memset(cmdbuf, 0, sizeof cmdbuf); /* Clear it, just in case */
438 retval = client_read(cmdbuf, 1);
440 lprintf(CTDL_ERR, "Client disconnected: ending session.\r\n");
445 /* FIXME ... this is woefully inefficient. */
447 XML_Parse(XMPP->xp, cmdbuf, 1, 0);
452 * Async loop for XMPP sessions (handles the transmission of unsolicited stanzas)
454 void xmpp_async_loop(void) {
455 xmpp_process_events();
456 jabber_output_incoming_messages();
461 * Login hook for XMPP sessions
463 void xmpp_login_hook(void) {
464 xmpp_queue_event(XMPP_EVT_LOGIN, CC->cs_inet_email);
469 * Logout hook for XMPP sessions
471 void xmpp_logout_hook(void) {
472 xmpp_queue_event(XMPP_EVT_LOGOUT, CC->cs_inet_email);
476 const char *CitadelServiceXMPP="XMPP";
478 #endif /* HAVE_EXPAT */
480 CTDL_MODULE_INIT(jabber)
484 CtdlRegisterServiceHook(config.c_xmpp_c2s_port,
490 CtdlRegisterSessionHook(xmpp_cleanup_function, EVT_STOP);
491 CtdlRegisterSessionHook(xmpp_login_hook, EVT_LOGIN);
492 CtdlRegisterSessionHook(xmpp_logout_hook, EVT_LOGOUT);
493 CtdlRegisterSessionHook(xmpp_login_hook, EVT_UNSTEALTH);
494 CtdlRegisterSessionHook(xmpp_logout_hook, EVT_STEALTH);
496 lprintf(CTDL_INFO, "This server is missing the Expat XML parser. Jabber service will be disabled.\n");
500 /* return our Subversion id for the Log */