citadel/modules/xmpp/xmpp_presence.c

   1 /*
   2  * $Id$
   3  *
   4  * Handle XMPP presence exchanges
   5  *
   6  * Copyright (c) 2007-2010 by Art Cancro
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 3 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  *
  22  */
  23
  24 #include "sysdep.h"
  25 #include <stdlib.h>
  26 #include <unistd.h>
  27 #include <stdio.h>
  28 #include <fcntl.h>
  29 #include <signal.h>
  30 #include <pwd.h>
  31 #include <errno.h>
  32 #include <sys/types.h>
  33
  34 #if TIME_WITH_SYS_TIME
  35 # include <sys/time.h>
  36 # include <time.h>
  37 #else
  38 # if HAVE_SYS_TIME_H
  39 #  include <sys/time.h>
  40 # else
  41 #  include <time.h>
  42 # endif
  43 #endif
  44
  45 #include <sys/wait.h>
  46 #include <string.h>
  47 #include <limits.h>
  48 #include <ctype.h>
  49 #include <expat.h>
  50 #include <libcitadel.h>
  51 #include "citadel.h"
  52 #include "server.h"
  53 #include "citserver.h"
  54 #include "support.h"
  55 #include "config.h"
  56 #include "internet_addressing.h"
  57 #include "md5.h"
  58 #include "ctdl_module.h"
  59 #include "serv_xmpp.h"
  60
  61
  62 /*
  63  * Initial dump of the entire wholist
  64  */
  65 void xmpp_wholist_presence_dump(void)
  66 {
  67         struct CitContext *cptr = NULL;
  68         int nContexts, i;
  69
  70         int aide = (CC->user.axlevel >= 6);
  71
  72         cptr = CtdlGetContextArray(&nContexts);
  73         if (!cptr) {
  74                 return;
  75         }
  76
  77         for (i=0; i<nContexts; i++) {
  78                 if (cptr[i].logged_in) {
  79                         if (
  80                                 (((cptr[i].cs_flags&CS_STEALTH)==0) || (aide))  /* aides see everyone */
  81                                 && (cptr[i].user.usernum != CC->user.usernum)   /* don't show myself */
  82                                 && (cptr[i].can_receive_im)                     /* IM-capable session */
  83                         ) {
  84                                 cprintf("<presence type=\"available\" from=\"%s\"></presence>",
  85                                         cptr[i].cs_inet_email);
  86                         }
  87                 }
  88         }
  89         free(cptr);
  90 }
  91
  92
  93 /*
  94  * Function to remove a buddy subscription and delete from the roster
  95  * (used in several places)
  96  */
  97 void xmpp_destroy_buddy(char *presence_jid) {
  98         static int unsolicited_id = 1;
  99
 100         /* Transmit non-presence information */
 101         cprintf("<presence type=\"unavailable\" from=\"%s\"></presence>", presence_jid);
 102         cprintf("<presence type=\"unsubscribed\" from=\"%s\"></presence>", presence_jid);
 103
 104         /* Do an unsolicited roster update that deletes the contact. */
 105         cprintf("<iq id=\"unbuddy_%x\" type=\"result\">", ++unsolicited_id);
 106         cprintf("<query xmlns=\"jabber:iq:roster\">");
 107         cprintf("<item jid=\"%s\" subscription=\"remove\">", presence_jid);
 108         cprintf("<group>%s</group>", config.c_humannode);
 109         cprintf("</item>");
 110         cprintf("</query>"
 111                 "</iq>"
 112         );
 113 }
 114
 115
 116 /*
 117  * When a user logs in or out of the local Citadel system, notify all XMPP sessions about it.
 118  */
 119 void xmpp_presence_notify(char *presence_jid, int event_type) {
 120         struct CitContext *cptr;
 121         static int unsolicited_id;
 122         int visible_sessions = 0;
 123         int nContexts, i;
 124         int aide = (CC->user.axlevel >= 6);
 125
 126         if (IsEmptyStr(presence_jid)) return;
 127         if (CC->kill_me) return;
 128
 129         cptr = CtdlGetContextArray(&nContexts);
 130         if (!cptr) {
 131                 return;
 132         }
 133
 134         /* Count the visible sessions for this user */
 135         for (i=0; i<nContexts; i++) {
 136                 if (cptr[i].logged_in) {
 137                         if (
 138                                 (!strcasecmp(cptr[i].cs_inet_email, presence_jid))
 139                                 && (((cptr[i].cs_flags&CS_STEALTH)==0) || (aide))
 140                                 && (cptr[i].can_receive_im)
 141                         ) {
 142                                 ++visible_sessions;
 143                         }
 144                 }
 145         }
 146
 147         CtdlLogPrintf(CTDL_DEBUG, "%d sessions for <%s> are now visible to session %d\n",
 148                 visible_sessions, presence_jid, CC->cs_pid);
 149
 150         if ( (event_type == XMPP_EVT_LOGIN) && (visible_sessions == 1) ) {
 151
 152                 CtdlLogPrintf(CTDL_DEBUG, "Telling session %d that <%s> logged in\n", CC->cs_pid, presence_jid);
 153
 154                 /* Do an unsolicited roster update that adds a new contact. */
 155                 for (i=0; i<nContexts; i++) {
 156                         if (cptr[i].logged_in) {
 157                                 if (!strcasecmp(cptr[i].cs_inet_email, presence_jid)) {
 158                                         cprintf("<iq id=\"unsolicited_%x\" type=\"result\">",
 159                                                 ++unsolicited_id);
 160                                         cprintf("<query xmlns=\"jabber:iq:roster\">");
 161                                         xmpp_roster_item(&cptr[i]);
 162                                         cprintf("</query>"
 163                                                 "</iq>");
 164                                 }
 165                         }
 166                 }
 167
 168                 /* Transmit presence information */
 169                 cprintf("<presence type=\"available\" from=\"%s\"></presence>", presence_jid);
 170         }
 171
 172         if (visible_sessions == 0) {
 173                 CtdlLogPrintf(CTDL_DEBUG, "Telling session %d that <%s> logged out\n", CC->cs_pid, presence_jid);
 174
 175                 xmpp_destroy_buddy(presence_jid);
 176         }
 177         free(cptr);
 178 }
 179
 180
 181
 182 /*
 183  * Upon logout we make an attempt to delete the whole roster, in order to
 184  * try to keep "ghost" buddies from remaining in the client-side roster.
 185  */
 186 void xmpp_massacre_roster(void)
 187 {
 188         struct CitContext *cptr;
 189         int nContexts, i;
 190         int aide = (CC->user.axlevel >= 6);
 191
 192         cptr = CtdlGetContextArray(&nContexts);
 193         if (cptr) {
 194                 for (i=0; i<nContexts; i++) {
 195                         if (cptr[i].logged_in) {
 196                                 if (
 197                                         (((cptr[i].cs_flags&CS_STEALTH)==0) || (aide))
 198                                         && (cptr[i].user.usernum != CC->user.usernum)
 199                                 ) {
 200                                         xmpp_destroy_buddy(cptr[i].cs_inet_email);
 201                                 }
 202                         }
 203                 }
 204                 free (cptr);
 205         }
 206 }
 207
 208
 209