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idle.c
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idle.c
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/*
* Copyright (c) 1994-2008 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 legal
* details, please contact
* Carnegie Mellon University
* Center for Technology Transfer and Enterprise Creation
* 4615 Forbes Avenue
* Suite 302
* Pittsburgh, PA 15213
* (412) 268-7393, fax: (412) 268-7395
* innovation@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.
*/
#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>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <signal.h>
#include <string.h>
#include <errno.h>
#include "assert.h"
#include "idle.h"
#include "idlemsg.h"
#include "global.h"
#include "util.h"
HIDDEN const char *idle_method_desc = "no";
/* link to idled */
static struct sockaddr_un idle_remote;
/* true if we've successfully told the idled
* that we want to be notified of changes */
static int idle_started;
/* Send the message 'which' about the mailbox 'mboxname' to the idled.
* Returns 0 on success or an IMAP error code on failure */
static int idle_send_msg(int which, const char *mboxname)
{
idle_message_t msg;
/* maybe the idled came along, so we always send anyway, because
* polled idle is too awful to contemplate */
/* fill the structure */
msg.which = which;
xstrncpy(msg.mboxname, mboxname ? mboxname : ".", sizeof(msg.mboxname));
/* send */
return idle_send(&idle_remote, &msg);
}
/*
* Notify idled of a mailbox change
*/
static void idle_notify(const char *mboxname)
{
int r;
/* We should try to determine if we need to send this
* (ie, is an imapd is IDLE on 'mailbox'?).
*/
r = idle_send_msg(IDLE_MSG_NOTIFY, mboxname);
if (r && (r != ENOENT)) {
/* ENOENT can happen as result of a race between delivering
* messages and restarting idled. It indicates that the
* idled's socket was unlinked, which means that idled went
* through it's graceful shutdown path, so don't syslog. */
syslog(LOG_ERR, "IDLE: error sending message "
"NOTIFY to idled for mailbox %s: %s.",
mboxname, error_message(r));
}
}
/*
* Create connection to idled for sending notifications
*/
EXPORTED void idle_init(void)
{
struct sockaddr_un local;
int fdflags;
int s;
int r;
if (!idle_enabled()) return;
r = idle_make_client_address(&local);
assert(r);
r = idle_make_server_address(&idle_remote);
assert(r);
idle_method_desc = "poll";
/* set the mailbox update notifier */
mailbox_set_updatenotifier(idle_notify);
if (!idle_init_sock(&local))
return;
s = idle_get_sock();
/* 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) {
idle_done_sock();
return;
}
idle_method_desc = "idled";
}
EXPORTED int idle_enabled(void)
{
int idle_period = config_getduration(IMAPOPT_IMAPIDLEPOLL, 's');
/* only enabled if a positive period */
return (idle_period > 0);
}
EXPORTED void idle_start(const char *mboxname)
{
int r;
if (!idle_enabled()) return;
/* Tell idled that we're idling. It doesn't
* matter if it fails, we'll still poll */
r = idle_send_msg(IDLE_MSG_INIT, mboxname);
if (r) {
int idle_timeout = config_getduration(IMAPOPT_IMAPIDLEPOLL, 's');
syslog(LOG_ERR, "IDLE: error sending message "
"INIT to idled for mailbox %s: %s. "
"Falling back to polling every %d seconds.",
mboxname, error_message(r), idle_timeout);
return;
}
idle_started = 1;
}
EXPORTED int idle_wait(int otherfd)
{
fd_set rfds;
int maxfd = -1;
int s = -1;
struct timeval timeout;
int r;
int flags = 0;
int idle_timeout = config_getduration(IMAPOPT_IMAPIDLEPOLL, 's');
if (!idle_enabled()) return 0;
/* If idled was not contacted, we still listen on the socket,
* because we might get ALERTs, but we won't get mailbox
* notifications. The poll timeout controls how quickly
* we will notice new mail arriving. */
FD_ZERO(&rfds);
s = idle_get_sock();
if (s >= 0) {
FD_SET(s, &rfds);
maxfd = MAX(maxfd, s);
}
if (otherfd >= 0) {
FD_SET(otherfd, &rfds);
maxfd = MAX(maxfd, otherfd);
}
/* Note: it's technically valid for there to be no fds to listen
* to, in the case where @otherfd is passed as -1 and we failed
* to talk to idled. It shouldn't happen though as we're always
* called with a valid otherfd. */
/* maximum possible timeout before we double-check anyway */
timeout.tv_sec = idle_timeout;
timeout.tv_usec = 0;
do {
r = signals_select(maxfd+1, &rfds, NULL, NULL, &timeout);
if (r < 0) {
if (errno == EAGAIN || errno == EINTR) continue;
syslog(LOG_ERR, "IDLE: select failed: %m");
return 0;
}
if (r == 0) {
/* timeout */
flags |= IDLE_MAILBOX|IDLE_ALERT;
}
if (r > 0 && s >= 0 && FD_ISSET(s, &rfds)) {
struct sockaddr_un from;
idle_message_t msg;
if (idle_recv(&from, &msg)) {
switch (msg.which) {
case IDLE_MSG_NOTIFY:
flags |= IDLE_MAILBOX;
break;
case IDLE_MSG_ALERT:
flags |= IDLE_ALERT;
break;
}
}
}
if (r > 0 && otherfd >= 0 && FD_ISSET(otherfd, &rfds))
flags |= IDLE_INPUT;
} while (!flags);
return flags;
}
EXPORTED void idle_stop(const char *mboxname)
{
int r;
if (!idle_started) return;
/* Tell idled that we're done idling */
r = idle_send_msg(IDLE_MSG_DONE, mboxname);
if (r && (r != ENOENT)) {
/* See comment in idle_notify() about ENOENT */
syslog(LOG_ERR, "IDLE: error sending message "
"DONE to idled for mailbox %s: %s.",
mboxname, error_message(r));
}
idle_started = 0;
}
EXPORTED void idle_done(void)
{
/* close the local socket */
idle_done_sock();
}

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