2 * Handle XMPP presence exchanges
4 * Copyright (c) 2007-2010 by Art Cancro
6 * This program is open source software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 3 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
30 #include <sys/types.h>
33 #if TIME_WITH_SYS_TIME
34 # include <sys/time.h>
38 # include <sys/time.h>
49 #include <libcitadel.h>
52 #include "citserver.h"
55 #include "internet_addressing.h"
57 #include "ctdl_module.h"
58 #include "serv_xmpp.h"
63 * Indicate the presence of another user to the client
64 * (used in several places)
66 void xmpp_indicate_presence(char *presence_jid)
68 XPUT("<presence from=\"");
69 XPutProp(presence_jid, strlen(presence_jid));
71 XPutProp(XMPP->client_jid, strlen(XMPP->client_jid));
72 XPUT("\"></presence>");
78 * Convenience function to determine whether any given session is 'visible' to any other given session,
79 * and is capable of receiving instant messages from that session.
81 int xmpp_is_visible(struct CitContext *cptr, struct CitContext *to_whom) {
82 int aide = (to_whom->user.axlevel >= AxAideU);
84 if ( (cptr->logged_in)
85 && (((cptr->cs_flags&CS_STEALTH)==0) || (aide)) /* aides see everyone */
86 && (cptr->user.usernum != to_whom->user.usernum) /* don't show myself */
87 && (cptr->can_receive_im) /* IM-capable session */
98 * Initial dump of the entire wholist
99 * Respond to a <presence> update by firing back with presence information
100 * on the entire wholist. Check this assumption, it's probably wrong.
102 void xmpp_wholist_presence_dump(void *data, const char *supplied_el, const char **attr)
104 struct CitContext *cptr = NULL;
107 cptr = CtdlGetContextArray(&nContexts);
112 for (i=0; i<nContexts; i++) {
113 if (xmpp_is_visible(&cptr[i], CC)) {
114 xmpp_indicate_presence(cptr[i].cs_inet_email);
122 * Function to remove a buddy subscription and delete from the roster
123 * (used in several places)
125 void xmpp_destroy_buddy(char *presence_jid, int aggressively) {
126 static int unsolicited_id = 1;
127 struct CitContext *CCC = CC;
129 if (!presence_jid) return;
131 if (!XMPP->client_jid) return;
133 /* Transmit non-presence information */
134 XPUT("<presence type=\"unavailable\" from=\"");
135 XPutProp(presence_jid, strlen(presence_jid));
137 XPutProp(XMPP->client_jid, strlen(XMPP->client_jid));
138 XPUT("\"></presence>");
141 * Setting the "aggressively" flag also sends an "unsubscribed" presence update.
142 * We only ask for this when flushing the client side roster, because if we do it
143 * in the middle of a session when another user logs off, some clients (Jitsi) interpret
144 * it as a rejection of a subscription request.
147 XPUT("<presence type=\"unsubscribed\" from=\"");
148 XPutProp(presence_jid, strlen(presence_jid));
150 XPutProp(XMPP->client_jid, strlen(XMPP->client_jid));
151 XPUT("\"></presence>");
154 // FIXME ... we should implement xmpp_indicate_nonpresence so we can use it elsewhere
156 /* Do an unsolicited roster update that deletes the contact. */
157 XPUT("<iq type=\"result\" from=\"");
158 XPutProp(CCC->cs_inet_email, strlen(CCC->cs_inet_email));
160 XPutProp(XMPP->client_jid, strlen(XMPP->client_jid));
161 XPUT("\" id=\"unbuddy_");
162 XPrintf("%x", ++unsolicited_id);
165 XPUT("<query xmlns=\"jabber:iq:roster\">"
166 "<item subscription=\"remove\" jid=\"");
167 XPutProp(presence_jid, strlen(presence_jid));
170 XPutBody(CFG_KEY(c_humannode));
180 * When a user logs in or out of the local Citadel system, notify all XMPP sessions about it.
181 * THIS FUNCTION HAS A BUG IN IT THAT ENUMERATES THE SESSIONS WRONG.
183 void xmpp_presence_notify(char *presence_jid, int event_type) {
184 struct CitContext *cptr;
185 static int unsolicited_id;
186 int visible_sessions = 0;
188 int which_cptr_is_relevant = (-1);
190 if (IsEmptyStr(presence_jid)) return;
191 if (CC->kill_me) return;
193 cptr = CtdlGetContextArray(&nContexts);
198 /* Count the visible sessions for this user */
199 for (i=0; i<nContexts; i++) {
200 if ( (!strcasecmp(cptr[i].cs_inet_email, presence_jid))
201 && (xmpp_is_visible(&cptr[i], CC))
204 which_cptr_is_relevant = i;
208 XMPP_syslog(LOG_DEBUG, "%d sessions for <%s> are now visible to session %d\n",
209 visible_sessions, presence_jid, CC->cs_pid);
211 if ( (event_type == XMPP_EVT_LOGIN) && (visible_sessions == 1) ) {
213 XMPP_syslog(LOG_DEBUG, "Telling session %d that <%s> logged in\n",
214 CC->cs_pid, presence_jid);
216 /* Do an unsolicited roster update that adds a new contact. */
217 assert(which_cptr_is_relevant >= 0);
218 XPUT("<iq type=\"result\" id=\"unsolicited_");
219 XPrintf("%x", ++unsolicited_id);
221 "<query xmlns=\"jabber:iq:roster\">");
222 xmpp_roster_item(&cptr[which_cptr_is_relevant]);
223 XPUT("</query></iq>");
225 /* Transmit presence information */
226 xmpp_indicate_presence(presence_jid);
229 if (visible_sessions == 0) {
230 XMPP_syslog(LOG_DEBUG, "Telling session %d that <%s> logged out\n",
231 CC->cs_pid, presence_jid);
232 xmpp_destroy_buddy(presence_jid, 0); /* non aggressive presence update */
240 void xmpp_fetch_mortuary_backend(long msgnum, void *userdata) {
241 HashList *mortuary = (HashList *) userdata;
242 struct CtdlMessage *msg;
246 msg = CtdlFetchMessage(msgnum, 1);
251 /* now add anyone we find into the hashlist */
253 /* skip past the headers */
254 ptr = strstr(msg->cm_fields[eMesageText], "\n\n");
259 ptr = strstr(msg->cm_fields[eMesageText], "\n\r\n");
265 /* the remaining lines are addresses */
267 ptr = strtok_r(ptr, "\n", &lasts);
268 while (ptr != NULL) {
269 char *pch = strdup(ptr);
270 Put(mortuary, pch, strlen(pch), pch, NULL);
271 ptr = strtok_r(NULL, "\n", &lasts);
281 * Fetch the "mortuary" - a list of dead buddies which we keep around forever
282 * so we can remove them from any client's roster that still has them listed
284 HashList *xmpp_fetch_mortuary(void) {
285 HashList *mortuary = NewHash(1, NULL);
287 XMPPM_syslog(LOG_ALERT, "NewHash() failed!\n");
291 if (CtdlGetRoom(&CC->room, USERCONFIGROOM) != 0) {
292 /* no config room exists - no further processing is required. */
295 CtdlForEachMessage(MSGS_LAST, 1, NULL, XMPPMORTUARY, NULL,
296 xmpp_fetch_mortuary_backend, (void *)mortuary );
304 * Fetch the "mortuary" - a list of dead buddies which we keep around forever
305 * so we can remove them from any client's roster that still has them listed
307 void xmpp_store_mortuary(HashList *mortuary) {
314 themsg = NewStrBuf();
315 StrBufPrintf(themsg, "Content-type: " XMPPMORTUARY "\n"
316 "Content-transfer-encoding: 7bit\n"
320 HashPos = GetNewHashPos(mortuary, 0);
321 while (GetNextHashPos(mortuary, HashPos, &len, &Key, &Value) != 0)
323 StrBufAppendPrintf(themsg, "%s\n", (char *)Value);
325 DeleteHashPos(&HashPos);
328 StrBufAppendPrintf(themsg, "foo@bar.com\n");
329 StrBufAppendPrintf(themsg, "baz@quux.com\n");
330 StrBufAppendPrintf(themsg, "haha%c\n", 1);
331 StrBufAppendPrintf(themsg, "baaaz@quux.com\n");
332 StrBufAppendPrintf(themsg, "baaaz@quuuuuux.com\n");
335 /* Delete the old mortuary */
336 CtdlDeleteMessages(USERCONFIGROOM, NULL, 0, XMPPMORTUARY);
338 /* And save the new one to disk */
339 quickie_message("Citadel", NULL, NULL, USERCONFIGROOM, ChrPtr(themsg), 4, "XMPP Mortuary");
346 * Upon logout we make an attempt to delete the whole roster, in order to
347 * try to keep "ghost" buddies from remaining in the client-side roster.
349 * Since the client is probably not still alive, also remember the current
350 * roster for next time so we can delete dead buddies then.
352 void xmpp_massacre_roster(void)
354 struct CitContext *cptr;
356 HashList *mortuary = xmpp_fetch_mortuary();
358 cptr = CtdlGetContextArray(&nContexts);
360 for (i=0; i<nContexts; i++) {
361 if (xmpp_is_visible(&cptr[i], CC)) {
363 char *buddy = strdup(cptr[i].cs_inet_email);
364 Put(mortuary, buddy, strlen(buddy), buddy, NULL);
372 xmpp_store_mortuary(mortuary);
373 DeleteHash(&mortuary);
380 * Stupidly, XMPP does not specify a way to tell the client to flush its client-side roster
381 * and prepare to receive a new one. So instead we remember every buddy we've ever told the
382 * client about, and push delete operations out at the beginning of a session.
384 * We omit any users who happen to be online right now, but we still keep them in the mortuary,
385 * which needs to be maintained as a list of every buddy the user has ever seen. We don't know
386 * when they're connecting from the same client and when they're connecting from a different client,
387 * so we have no guarantee of what is in the client side roster at connect time.
389 void xmpp_delete_old_buddies_who_no_longer_exist_from_the_client_roster(void)
394 struct CitContext *cptr;
397 HashList *mortuary = xmpp_fetch_mortuary();
398 HashPos *HashPos = GetNewHashPos(mortuary, 0);
400 /* we need to omit anyone who is currently online */
401 cptr = CtdlGetContextArray(&nContexts);
403 /* go through the list of users in the mortuary... */
404 while (GetNextHashPos(mortuary, HashPos, &len, &Key, &Value) != 0)
408 if (cptr) for (i=0; i<nContexts; i++) {
409 if (xmpp_is_visible(&cptr[i], CC)) {
410 if (!strcasecmp(cptr[i].cs_inet_email, (char *)Value)) {
417 xmpp_destroy_buddy((char *)Value, 1); /* aggressive presence update */
421 DeleteHashPos(&HashPos);
422 DeleteHash(&mortuary);
427 CTDL_MODULE_INIT(xmpp_presence)
430 AddXMPPEndHandler(HKEY("presence"), xmpp_wholist_presence_dump, 0);
432 return "xmpp_presence";