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)
61 lprintf(CTDL_DEBUG, "New stream detected.\n");
64 if (!strcasecmp(attr[0], "to")) {
65 safestrncpy(XMPP->server_name, attr[1], sizeof XMPP->server_name);
70 cprintf("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
72 cprintf("<stream:stream ");
73 cprintf("from=\"%s\" ", XMPP->server_name);
74 cprintf("id=\"%08x\" ", CC->cs_pid);
75 cprintf("version=\"1.0\" ");
76 cprintf("xmlns:stream=\"http://etherx.jabber.org/streams\" ");
77 cprintf("xmlns=\"jabber:client\">");
79 /* The features of this stream are... */
80 cprintf("<stream:features>");
83 /* If we're not logged in yet, offer SASL as our feature set */
84 xmpp_output_auth_mechs();
87 /* If we've logged in, now offer binding and sessions as our feature set */
88 cprintf("<bind xmlns=\"urn:ietf:params:xml:ns:xmpp-bind\"/>");
89 cprintf("<session xmlns=\"urn:ietf:params:xml:ns:xmpp-session\"/>");
92 cprintf("</stream:features>");
94 CC->is_async = 1; /* XMPP sessions are inherently async-capable */
98 void xmpp_xml_start(void *data, const char *supplied_el, const char **attr) {
103 /* Axe the namespace, we don't care about it */
104 safestrncpy(el, supplied_el, sizeof el);
105 while (sep = strchr(el, ':'), sep) {
109 lprintf(CTDL_DEBUG, "XMPP ELEMENT START: <%s>\n", el);
111 for (i=0; attr[i] != NULL; i+=2) {
112 lprintf(CTDL_DEBUG, " Attribute '%s' = '%s'\n", attr[i], attr[i+1]);
115 if (!strcasecmp(el, "stream")) {
116 xmpp_stream_start(data, supplied_el, attr);
119 else if (!strcasecmp(el, "query")) {
120 XMPP->iq_query_xmlns[0] = 0;
121 safestrncpy(XMPP->iq_query_xmlns, supplied_el, sizeof XMPP->iq_query_xmlns);
124 else if (!strcasecmp(el, "iq")) {
125 for (i=0; attr[i] != NULL; i+=2) {
126 if (!strcasecmp(attr[i], "type")) {
127 safestrncpy(XMPP->iq_type, attr[i+1], sizeof XMPP->iq_type);
129 else if (!strcasecmp(attr[i], "id")) {
130 safestrncpy(XMPP->iq_id, attr[i+1], sizeof XMPP->iq_id);
132 else if (!strcasecmp(attr[i], "from")) {
133 safestrncpy(XMPP->iq_from, attr[i+1], sizeof XMPP->iq_from);
135 else if (!strcasecmp(attr[i], "to")) {
136 safestrncpy(XMPP->iq_to, attr[i+1], sizeof XMPP->iq_to);
141 else if (!strcasecmp(el, "auth")) {
142 XMPP->sasl_auth_mech[0] = 0;
143 for (i=0; attr[i] != NULL; i+=2) {
144 if (!strcasecmp(attr[i], "mechanism")) {
145 safestrncpy(XMPP->sasl_auth_mech, attr[i+1], sizeof XMPP->sasl_auth_mech);
150 else if (!strcasecmp(el, "message")) {
151 for (i=0; attr[i] != NULL; i+=2) {
152 if (!strcasecmp(attr[i], "to")) {
153 safestrncpy(XMPP->message_to, attr[i+1], sizeof XMPP->message_to);
161 void xmpp_xml_end(void *data, const char *supplied_el) {
165 /* Axe the namespace, we don't care about it */
166 safestrncpy(el, supplied_el, sizeof el);
167 while (sep = strchr(el, ':'), sep) {
171 lprintf(CTDL_DEBUG, "XMPP ELEMENT END : <%s>\n", el);
172 if (XMPP->chardata_len > 0) {
173 lprintf(CTDL_DEBUG, " chardata: %s\n", XMPP->chardata);
176 if (!strcasecmp(el, "resource")) {
177 if (XMPP->chardata_len > 0) {
178 safestrncpy(XMPP->iq_client_resource, XMPP->chardata,
179 sizeof XMPP->iq_client_resource);
183 else if (!strcasecmp(el, "iq")) {
186 * iq type="get" (handle queries)
188 if (!strcasecmp(XMPP->iq_type, "get")) {
191 * Query on a namespace
193 if (!IsEmptyStr(XMPP->iq_query_xmlns)) {
194 xmpp_query_namespace(XMPP->iq_id, XMPP->iq_from,
195 XMPP->iq_to, XMPP->iq_query_xmlns);
199 * Unknown queries ... return the XML equivalent of a blank stare
202 cprintf("<iq type=\"result\" id=\"%s\">", XMPP->iq_id);
208 * If this <iq> stanza was a "bind" attempt, process it ...
210 else if ( (!IsEmptyStr(XMPP->iq_id)) && (!IsEmptyStr(XMPP->iq_client_resource)) ) {
212 /* Generate the "full JID" of the client resource */
214 snprintf(XMPP->client_jid, sizeof XMPP->client_jid,
217 XMPP->iq_client_resource
220 /* Tell the client what its JID is */
222 cprintf("<iq type=\"result\" id=\"%s\">", XMPP->iq_id);
223 cprintf("<bind xmlns=\"urn:ietf:params:xml:ns:xmpp-bind\">");
224 cprintf("<jid>%s</jid>", XMPP->client_jid);
229 else if (XMPP->iq_session) {
230 cprintf("<iq type=\"result\" id=\"%s\">", XMPP->iq_id);
235 cprintf("<iq type=\"error\" id=\"%s\">", XMPP->iq_id);
236 cprintf("<error></error>");
240 /* Now clear these fields out so they don't get used by a future stanza */
242 XMPP->iq_from[0] = 0;
244 XMPP->iq_type[0] = 0;
245 XMPP->iq_client_resource[0] = 0;
246 XMPP->iq_session = 0;
247 XMPP->iq_query_xmlns[0] = 0;
250 else if (!strcasecmp(el, "auth")) {
252 /* Try to authenticate (this function is responsible for the output stanza) */
253 xmpp_sasl_auth(XMPP->sasl_auth_mech, (XMPP->chardata != NULL ? XMPP->chardata : "") );
255 /* Now clear these fields out so they don't get used by a future stanza */
256 XMPP->sasl_auth_mech[0] = 0;
259 else if (!strcasecmp(el, "session")) {
260 XMPP->iq_session = 1;
263 else if (!strcasecmp(el, "presence")) {
265 /* Respond to a <presence> update by firing back with presence information
266 * on the entire wholist. Check this assumption, it's probably wrong.
268 jabber_wholist_presence_dump();
271 else if (!strcasecmp(el, "body")) {
272 if (XMPP->message_body != NULL) {
273 free(XMPP->message_body);
274 XMPP->message_body = NULL;
276 if (XMPP->chardata_len > 0) {
277 XMPP->message_body = strdup(XMPP->chardata);
281 else if (!strcasecmp(el, "message")) {
282 jabber_send_message(XMPP->message_to, XMPP->message_body);
285 XMPP->chardata_len = 0;
286 if (XMPP->chardata_alloc > 0) {
287 XMPP->chardata[0] = 0;
292 void xmpp_xml_chardata(void *data, const XML_Char *s, int len)
294 struct citxmpp *X = XMPP;
296 if (X->chardata_alloc == 0) {
297 X->chardata_alloc = SIZ;
298 X->chardata = malloc(X->chardata_alloc);
300 if ((X->chardata_len + len + 1) > X->chardata_alloc) {
301 X->chardata_alloc = X->chardata_len + len + 1024;
302 X->chardata = realloc(X->chardata, X->chardata_alloc);
304 memcpy(&X->chardata[X->chardata_len], s, len);
305 X->chardata_len += len;
306 X->chardata[X->chardata_len] = 0;
311 * This cleanup function blows away the temporary memory and files used by the XMPP service.
313 void xmpp_cleanup_function(void) {
315 /* Don't do this stuff if this is not a XMPP session! */
316 if (CC->h_command_function != xmpp_command_loop) return;
318 lprintf(CTDL_DEBUG, "Performing XMPP cleanup hook\n");
319 if (XMPP->chardata != NULL) {
320 free(XMPP->chardata);
321 XMPP->chardata = NULL;
322 XMPP->chardata_len = 0;
323 XMPP->chardata_alloc = 0;
324 if (XMPP->message_body != NULL) {
325 free(XMPP->message_body);
328 XML_ParserFree(XMPP->xp);
335 * Here's where our XMPP session begins its happy day.
337 void xmpp_greeting(void) {
338 strcpy(CC->cs_clientname, "Jabber session");
339 CC->session_specific_data = malloc(sizeof(struct citxmpp));
340 memset(XMPP, 0, sizeof(struct citxmpp));
341 XMPP->last_event_processed = queue_event_seq;
343 /* XMPP does not use a greeting, but we still have to initialize some things. */
345 XMPP->xp = XML_ParserCreateNS("UTF-8", ':');
346 if (XMPP->xp == NULL) {
347 lprintf(CTDL_ALERT, "Cannot create XML parser!\n");
352 XML_SetElementHandler(XMPP->xp, xmpp_xml_start, xmpp_xml_end);
353 XML_SetCharacterDataHandler(XMPP->xp, xmpp_xml_chardata);
354 // XML_SetUserData(XMPP->xp, something...);
359 * Main command loop for XMPP sessions.
361 void xmpp_command_loop(void) {
366 memset(cmdbuf, 0, sizeof cmdbuf); /* Clear it, just in case */
367 retval = client_read(cmdbuf, 1);
369 lprintf(CTDL_ERR, "Client disconnected: ending session.\r\n");
374 /* FIXME ... this is woefully inefficient. */
376 XML_Parse(XMPP->xp, cmdbuf, 1, 0);
381 * Async loop for XMPP sessions (handles the transmission of unsolicited stanzas)
383 void xmpp_async_loop(void) {
384 xmpp_process_events();
385 jabber_output_incoming_messages();
390 * Login hook for XMPP sessions
392 void xmpp_login_hook(void) {
393 xmpp_queue_event(XMPP_EVT_LOGIN, CC->cs_inet_email);
398 * Logout hook for XMPP sessions
400 void xmpp_logout_hook(void) {
401 xmpp_queue_event(XMPP_EVT_LOGOUT, CC->cs_inet_email);
405 const char *CitadelServiceXMPP="XMPP";
407 #endif /* HAVE_EXPAT */
409 CTDL_MODULE_INIT(jabber)
413 CtdlRegisterServiceHook(5222, /* FIXME change to config.c_xmpp_port */
419 CtdlRegisterSessionHook(xmpp_cleanup_function, EVT_STOP);
420 CtdlRegisterSessionHook(xmpp_login_hook, EVT_LOGIN);
421 CtdlRegisterSessionHook(xmpp_logout_hook, EVT_LOGOUT);
424 lprintf(CTDL_INFO, "This server is missing the Expat XML parser. Jabber service will be disabled.\n");
428 /* return our Subversion id for the Log */