citadel/modules/xmpp/xmpp_queue.c

   1 /*
   2  * XMPP event queue
   3  *
   4  * Copyright (c) 2007-2017 by Art Cancro
   5  *
   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 version 3.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #include "sysdep.h"
  16 #include <stdlib.h>
  17 #include <unistd.h>
  18 #include <stdio.h>
  19 #include <fcntl.h>
  20 #include <signal.h>
  21 #include <pwd.h>
  22 #include <errno.h>
  23 #include <sys/types.h>
  24
  25 #if TIME_WITH_SYS_TIME
  26 # include <sys/time.h>
  27 # include <time.h>
  28 #else
  29 # if HAVE_SYS_TIME_H
  30 #  include <sys/time.h>
  31 # else
  32 #  include <time.h>
  33 # endif
  34 #endif
  35
  36 #include <sys/wait.h>
  37 #include <string.h>
  38 #include <limits.h>
  39 #include <ctype.h>
  40 #include <expat.h>
  41 #include <libcitadel.h>
  42 #include "citadel.h"
  43 #include "server.h"
  44 #include "citserver.h"
  45 #include "support.h"
  46 #include "config.h"
  47 #include "internet_addressing.h"
  48 #include "md5.h"
  49 #include "ctdl_module.h"
  50 #include "serv_xmpp.h"
  51
  52 int queue_event_seq = 0;
  53
  54 void xmpp_queue_event(int event_type, char *email_addr) {
  55
  56         struct xmpp_event *xptr = NULL;
  57         struct xmpp_event *new_event = NULL;
  58         struct xmpp_event *last = NULL;
  59         int purged_something = 0;
  60         struct CitContext *cptr;
  61
  62         syslog(LOG_DEBUG, "xmpp: xmpp_queue_event(%d, %s)", event_type, email_addr);
  63
  64         /* Purge events more than a minute old */
  65         begin_critical_section(S_XMPP_QUEUE);
  66         do {
  67                 purged_something = 0;
  68                 if (xmpp_queue != NULL) {
  69                         if ((time(NULL) - xmpp_queue->event_time) > 60) {
  70                                 xptr = xmpp_queue->next;
  71                                 free(xmpp_queue);
  72                                 xmpp_queue = xptr;
  73                                 purged_something = 1;
  74                         }
  75                 }
  76         } while(purged_something);
  77         end_critical_section(S_XMPP_QUEUE);
  78
  79         /* Create a new event */
  80         new_event = (struct xmpp_event *) malloc(sizeof(struct xmpp_event));
  81         new_event->next = NULL;
  82         new_event->event_time = time(NULL);
  83         new_event->event_seq = ++queue_event_seq;
  84         new_event->event_type = event_type;
  85         new_event->session_which_generated_this_event = CC->cs_pid;
  86         safestrncpy(new_event->event_jid, email_addr, sizeof new_event->event_jid);
  87
  88         /* Add it to the list */
  89         begin_critical_section(S_XMPP_QUEUE);
  90         if (xmpp_queue == NULL) {
  91                 xmpp_queue = new_event;
  92         }
  93         else {
  94                 for (xptr = xmpp_queue; xptr != NULL; xptr = xptr->next) {
  95                         if (xptr->next == NULL) {
  96                                 last = xptr;
  97                         }
  98                 }
  99                 last->next = new_event;
 100         }
 101         end_critical_section(S_XMPP_QUEUE);
 102
 103         /* Tell the sessions that something is happening */
 104         begin_critical_section(S_SESSION_TABLE);
 105         for (cptr = ContextList; cptr != NULL; cptr = cptr->next) {
 106                 if ((cptr->logged_in) && (cptr->h_async_function == xmpp_async_loop)) {
 107                         set_async_waiting(cptr);
 108                 }
 109         }
 110         end_critical_section(S_SESSION_TABLE);
 111 }
 112
 113
 114 /*
 115  * Are we interested in anything from the queue?  (Called in async loop)
 116  */
 117 void xmpp_process_events(void) {
 118         struct xmpp_event *xptr = NULL;
 119         int highest_event = 0;
 120
 121         for (xptr=xmpp_queue; xptr!=NULL; xptr=xptr->next) {
 122                 if (xptr->event_seq > XMPP->last_event_processed) {
 123
 124                         switch(xptr->event_type) {
 125
 126                                 case XMPP_EVT_LOGIN:
 127                                 case XMPP_EVT_LOGOUT:
 128                                         if (xptr->session_which_generated_this_event != CC->cs_pid) {
 129                                                 xmpp_presence_notify(xptr->event_jid, xptr->event_type);
 130                                         }
 131                                         break;
 132                         }
 133
 134                         if (xptr->event_seq > highest_event) {
 135                                 highest_event = xptr->event_seq;
 136                         }
 137                 }
 138         }
 139
 140         XMPP->last_event_processed = highest_event;
 141 }
 142
 143
 144 void xmpp_cleanup_events(void)
 145 {
 146         struct xmpp_event *ptr, *ptr2;
 147         begin_critical_section(S_XMPP_QUEUE);
 148         ptr = xmpp_queue;
 149         xmpp_queue = NULL;
 150         while (ptr != NULL) {
 151                 ptr2 = ptr->next;
 152                 free(ptr);
 153                 ptr = ptr2;
 154         }
 155         end_critical_section(S_XMPP_QUEUE);
 156
 157 }