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idle_idled.c
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idle_idled.c
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/*
* Copyright (c) 2000 Carnegie Mellon University. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The name "Carnegie Mellon University" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For permission or any other legal
* details, please contact
* Office of Technology Transfer
* Carnegie Mellon University
* 5000 Forbes Avenue
* Pittsburgh, PA 15213-3890
* (412) 268-4387, fax: (412) 268-7395
* tech-transfer@andrew.cmu.edu
*
* 4. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by Computing Services
* at Carnegie Mellon University (http://www.cmu.edu/computing/)."
*
* CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
* THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
* FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/* $Id: idle_idled.c,v 1.9 2002/01/18 22:58:47 rjs3 Exp $ */
#include <config.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <syslog.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <syslog.h>
#include <time.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <signal.h>
#include "idle.h"
#include "idled.h"
#include "imapconf.h"
const char *idle_method_desc = "idled";
/* function to report mailbox updates to the client */
static idle_updateproc_t *idle_update = NULL;
/* how often to poll the mailbox */
static time_t idle_period = -1;
/* UNIX socket variables */
static int notify_sock = -1;
static struct sockaddr_un idle_remote;
static int idle_remote_len = 0;
/* Forward declarations */
int idle_send_msg(int msg, struct mailbox *mailbox);
void idle_notify(struct mailbox *mailbox);
/*
* Create connection to idled for sending notifications
*/
int idle_enabled(void)
{
int s;
int fdflags;
struct stat sbuf;
const char *idle_sock;
/* if the socket is already open, return */
if (notify_sock != -1) {
return 1;
}
/* get polling period in case we can't connect to idled
* NOTE: if used, a period of zero disables IDLE
*/
if (idle_period == -1) {
idle_period = config_getint("imapidlepoll", 60);
if (idle_period < 0) idle_period = 0;
}
if ((s = socket(AF_UNIX, SOCK_DGRAM, 0)) == -1) {
return idle_period;
}
/* set the mailbox update notifier */
mailbox_set_updatenotifier(idle_notify);
idle_remote.sun_family = AF_UNIX;
idle_sock = config_getstring("idlesocket", NULL);
if (idle_sock) {
strcpy(idle_remote.sun_path, idle_sock);
}
else {
strcpy(idle_remote.sun_path, config_dir);
strcat(idle_remote.sun_path, FNAME_IDLE_SOCK);
}
idle_remote_len = sizeof(idle_remote.sun_family) +
strlen(idle_remote.sun_path) + 1;
/* check that the socket exists */
if (stat(idle_remote.sun_path, &sbuf) < 0) {
close(s);
return idle_period;
}
/* put us in non-blocking mode */
fdflags = fcntl(s, F_GETFD, 0);
if (fdflags != -1) fdflags = fcntl(s, F_SETFL, O_NONBLOCK | fdflags);
if (fdflags == -1) { close(s); return idle_period; }
notify_sock = s;
return 1;
}
static void idle_poll(int sig)
{
switch (sig) {
case SIGUSR1:
idle_update(IDLE_MAILBOX);
break;
case SIGUSR2:
idle_update(IDLE_ALERT);
break;
case SIGALRM:
idle_update(IDLE_MAILBOX|IDLE_ALERT);
alarm(idle_period);
break;
}
}
int idle_init(struct mailbox *mailbox, idle_updateproc_t *proc)
{
struct sigaction action;
idle_update = proc;
sigemptyset(&action.sa_mask);
action.sa_flags = 0;
#ifdef SA_RESTART
action.sa_flags |= SA_RESTART;
#endif
action.sa_handler = idle_poll;
/* Tell idled that we're idling */
if (idle_send_msg(IDLE_INIT, mailbox)) {
/* if we can talk to idled, setup the signal handlers */
if ((sigaction(SIGUSR1, &action, NULL) < 0) ||
(sigaction(SIGUSR2, &action, NULL) < 0)) {
syslog(LOG_ERR, "sigaction: %m");
return 0;
}
}
else { /* otherwise, we'll poll with SIGALRM */
if (sigaction(SIGALRM, &action, NULL) < 0) {
syslog(LOG_ERR, "sigaction: %m");
return 0;
}
alarm(idle_period);
}
return 1;
}
void idle_done(struct mailbox *mailbox)
{
/* Tell idled that we're done idling */
idle_send_msg(IDLE_DONE, mailbox);
/* Remove the signal handlers */
signal(SIGUSR1, SIG_IGN);
signal(SIGUSR2, SIG_IGN);
signal(SIGALRM, SIG_IGN);
}
/*
* Send a message to idled
*/
int idle_send_msg(int msg, struct mailbox *mailbox)
{
idle_data_t idledata;
/* fill the structure */
idledata.msg = msg;
idledata.pid = getpid();
strcpy(idledata.mboxname, mailbox ? mailbox->name : ".");
/* send */
if (sendto(notify_sock, (void *) &idledata,
IDLEDATA_BASE_SIZE+strlen(idledata.mboxname)+1, /* 1 for NULL */
0, (struct sockaddr *) &idle_remote, idle_remote_len) == -1) {
syslog(LOG_ERR, "error sending to idled: %x", msg);
return 0;
}
return 1;
}
/*
* Notify imapidled of a mailbox change
*/
void idle_notify(struct mailbox *mailbox)
{
/* We should try to determine if we need to send this
* (ie, is an imapd is IDLE on 'mailbox'?).
*/
idle_send_msg(IDLE_NOTIFY, mailbox);
}

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