Adding upstream version 3.4.23.upstream/3.4.23upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 192 insertions, 0 deletions

diff --git a/src/master/master_wakeup.c b/src/master/master_wakeup.c
new file mode 100644
index 0000000..cc50924
--- /dev/null
+++ b/src/master/master_wakeup.c
@@ -0,0 +1,192 @@
+/*++
+/* NAME
+/*	master_wakeup 3
+/* SUMMARY
+/*	Postfix master - start/stop service wakeup timers
+/* SYNOPSIS
+/*	#include "master.h"
+/*
+/*	void	master_wakeup_init(serv)
+/*	MASTER_SERV *serv;
+/*
+/*	void	master_wakeup_cleanup(serv)
+/*	MASTER_SERV *serv;
+/* DESCRIPTION
+/*	This module implements automatic service wakeup. In order to
+/*	wakeup a service, a wakeup trigger is sent to the corresponding
+/*	service port or FIFO, and a timer is started to repeat this sequence
+/*	after a configurable amount of time.
+/*
+/*	master_wakeup_init() wakes up the named service. No wakeup
+/*	is done or scheduled when a zero wakeup time is given, or when
+/*	the service has been throttled in the mean time.
+/*	It is OK to call master_wakeup_init() while a timer is already
+/*	running for the named service. The effect is to restart the
+/*	wakeup timer.
+/*
+/*	master_wakeup_cleanup() cancels the wakeup timer for the named
+/*	service. It is an error to disable a service while it still has
+/*	an active wakeup timer (doing so would cause a dangling reference
+/*	to a non-existent service).
+/*	It is OK to call master_wakeup_cleanup() even when no timer is
+/*	active for the named service.
+/* DIAGNOSTICS
+/* BUGS
+/* SEE ALSO
+/*	inet_trigger(3), internet-domain client
+/*	unix_trigger(3), unix-domain client
+/*	fifo_trigger(3), fifo client
+/*	upass_trigger(3), file descriptor passing client
+/* LICENSE
+/* .ad
+/* .fi
+/*	The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/*	Wietse Venema
+/*	IBM T.J. Watson Research
+/*	P.O. Box 704
+/*	Yorktown Heights, NY 10598, USA
+/*
+/*	Wietse Venema
+/*	Google, Inc.
+/*	111 8th Avenue
+/*	New York, NY 10011, USA
+/*--*/
+
+/* System library. */
+
+#include <sys_defs.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+
+/* Utility library. */
+
+#include <msg.h>
+#include <trigger.h>
+#include <events.h>
+#include <set_eugid.h>
+#include <set_ugid.h>
+
+/* Global library. */
+
+#include <mail_proto.h>			/* triggers */
+#include <mail_params.h>
+
+/* Application-specific. */
+
+#include "mail_server.h"
+#include "master.h"
+
+/* master_wakeup_timer_event - wakeup event handler */
+
+static void master_wakeup_timer_event(int unused_event, void *context)
+{
+    const char *myname = "master_wakeup_timer_event";
+    MASTER_SERV *serv = (MASTER_SERV *) context;
+    int     status;
+    static char wakeup = TRIGGER_REQ_WAKEUP;
+
+    /*
+     * Don't wakeup services whose automatic wakeup feature was turned off in
+     * the mean time.
+     */
+    if (serv->wakeup_time == 0)
+	return;
+
+    /*
+     * Don't wake up services that are throttled. Find out what transport to
+     * use. We can't block here so we choose a short timeout.
+     */
+#define BRIEFLY	1
+
+    if (MASTER_THROTTLED(serv) == 0) {
+	if (msg_verbose)
+	    msg_info("%s: service %s", myname, serv->name);
+
+	switch (serv->type) {
+	case MASTER_SERV_TYPE_INET:
+	    status = inet_trigger(serv->name, &wakeup, sizeof(wakeup), BRIEFLY);
+	    break;
+	case MASTER_SERV_TYPE_UNIX:
+	    status = LOCAL_TRIGGER(serv->name, &wakeup, sizeof(wakeup), BRIEFLY);
+	    break;
+	case MASTER_SERV_TYPE_UXDG:
+	    status = -1;
+	    errno = EOPNOTSUPP;
+	    break;
+#ifdef MASTER_SERV_TYPE_PASS
+	case MASTER_SERV_TYPE_PASS:
+	    status = pass_trigger(serv->name, &wakeup, sizeof(wakeup), BRIEFLY);
+	    break;
+#endif
+
+	    /*
+	     * If someone compromises the postfix account then this must not
+	     * overwrite files outside the chroot jail. Countermeasures:
+	     * 
+	     * - Limit the damage by accessing the FIFO as postfix not root.
+	     * 
+	     * - Have fifo_trigger() call safe_open() so we won't follow
+	     * arbitrary hard/symlinks to files in/outside the chroot jail.
+	     * 
+	     * - All non-chroot postfix-related files must be root owned (or
+	     * postfix check complains).
+	     * 
+	     * - The postfix user and group ID must not be shared with other
+	     * applications (says the INSTALL documentation).
+	     * 
+	     * Result of a discussion with Michael Tokarev, who received his
+	     * insights from Solar Designer, who tested Postfix with a kernel
+	     * module that is paranoid about open() calls.
+	     */
+	case MASTER_SERV_TYPE_FIFO:
+	    set_eugid(var_owner_uid, var_owner_gid);
+	    status = fifo_trigger(serv->name, &wakeup, sizeof(wakeup), BRIEFLY);
+	    set_ugid(getuid(), getgid());
+	    break;
+	default:
+	    msg_panic("%s: unknown service type: %d", myname, serv->type);
+	}
+	if (status < 0)
+	    msg_warn("%s: service %s(%s): %m",
+		     myname, serv->ext_name, serv->name);
+    }
+
+    /*
+     * Schedule another wakeup event.
+     */
+    event_request_timer(master_wakeup_timer_event, (void *) serv,
+			serv->wakeup_time);
+}
+
+/* master_wakeup_init - start automatic service wakeup */
+
+void    master_wakeup_init(MASTER_SERV *serv)
+{
+    const char *myname = "master_wakeup_init";
+
+    if (serv->wakeup_time == 0 || (serv->flags & MASTER_FLAG_CONDWAKE))
+	return;
+    if (msg_verbose)
+	msg_info("%s: service %s time %d",
+		 myname, serv->name, serv->wakeup_time);
+    master_wakeup_timer_event(0, (void *) serv);
+}
+
+/* master_wakeup_cleanup - cancel wakeup timer */
+
+void    master_wakeup_cleanup(MASTER_SERV *serv)
+{
+    const char *myname = "master_wakeup_cleanup";
+
+    /*
+     * Cleanup, even when the wakeup feature has been turned off. There might
+     * still be a pending timer. Don't depend on the code that reloads the
+     * config file to reset the wakeup timer when things change.
+     */
+    if (msg_verbose)
+	msg_info("%s: service %s", myname, serv->name);
+
+    event_cancel_timer(master_wakeup_timer_event, (void *) serv);
+}