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/*
* Copyright (C) 2015 Red Hat, Inc.
*
* This file is part of LVM2.
*
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU Lesser General Public License v.2.1.
*/
#include "lib/misc/lib.h"
#include "lib/commands/toolcontext.h"
#include "lib/notify/lvmnotify.h"
#define LVM_DBUS_DESTINATION "com.redhat.lvmdbus1"
#define LVM_DBUS_PATH "/com/redhat/lvmdbus1/Manager"
#define LVM_DBUS_INTERFACE "com.redhat.lvmdbus1.Manager"
#define LVM_DBUS_LOCK_FILE "/var/lock/lvm/lvmdbusd"
#define LVM_DBUS_LOCK_FILE_ENV_KEY "LVM_DBUSD_LOCKFILE"
#define SD_BUS_SYSTEMD_NO_SUCH_UNIT_ERROR "org.freedesktop.systemd1.NoSuchUnit"
#define SD_BUS_DBUS_SERVICE_UNKNOWN_ERROR "org.freedesktop.DBus.Error.ServiceUnknown"
#ifdef NOTIFYDBUS_SUPPORT
#include <systemd/sd-bus.h>
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
int lvmnotify_is_supported(void)
{
return 1;
}
static int lvmdbusd_running(void)
{
int fd = 0;
int rc = 0;
int errno_cpy = 0;
int running = 0;
const char *lockfile = NULL;
/*
* lvm dbusd uses a lock file with a lock on it, thus to determine if the daemon is running
* requires that you attempt to lock the file as well. Thus the existence of the file does
* not mean it's running, but the absence of the file does indicate it's not running.
*
* See lvmdbusd for more details.
*/
lockfile = getenv(LVM_DBUS_LOCK_FILE_ENV_KEY);
if (!lockfile) {
lockfile = LVM_DBUS_LOCK_FILE;
}
errno = 0;
fd = open(lockfile, O_RDWR);
if (-1 == fd) {
errno_cpy = errno;
if (errno_cpy == ENOENT) {
return 0;
} else {
/* Safest option is to return running when we encounter unexpected errors */
log_debug_dbus("Unexpected errno: %d on lockfile open, returning running", errno_cpy);
return 1;
}
}
/* Need to ensure we close lock FD now */
errno = 0;
rc = lockf(fd, F_TLOCK|F_TEST, 0);
if (-1 != rc) {
/* Not locked, thus not running */
running = 0;
} else {
errno_cpy = errno;
if (errno_cpy == EACCES || errno_cpy == EAGAIN) {
/* Locked, so daemon is running */
running = 1;
} else {
log_debug_dbus("Unexpected errno: %d on lockf, returning running", errno_cpy);
running = 1 ;
}
}
close(fd);
return running;
}
void lvmnotify_send(struct cmd_context *cmd)
{
static const char _dbus_notification_failed_msg[] = "D-Bus notification failed";
sd_bus *bus = NULL;
sd_bus_message *m = NULL;
sd_bus_error error = SD_BUS_ERROR_NULL;
const char *cmd_name;
int ret;
int result = 0;
if (!cmd->vg_notify && !cmd->lv_notify && !cmd->pv_notify)
return;
cmd->vg_notify = 0;
cmd->lv_notify = 0;
cmd->pv_notify = 0;
/* If lvmdbusd isn't running, don't notify as you will start it as it will auto activate */
if (!lvmdbusd_running()) {
log_debug_dbus("dbus damon not running, not notifying");
return;
}
cmd_name = get_cmd_name();
ret = sd_bus_open_system(&bus);
if (ret < 0) {
log_debug_dbus("Failed to connect to dbus: %d", ret);
return;
}
log_debug_dbus("Nofify dbus at %s.", LVM_DBUS_DESTINATION);
ret = sd_bus_call_method(bus,
LVM_DBUS_DESTINATION,
LVM_DBUS_PATH,
LVM_DBUS_INTERFACE,
"ExternalEvent",
&error,
&m,
"s",
cmd_name);
if (ret < 0) {
if (sd_bus_error_has_name(&error, SD_BUS_SYSTEMD_NO_SUCH_UNIT_ERROR) ||
sd_bus_error_has_name(&error, SD_BUS_DBUS_SERVICE_UNKNOWN_ERROR))
log_debug_dbus("%s: %s", _dbus_notification_failed_msg, error.message);
else
log_warn("WARNING: %s: %s", _dbus_notification_failed_msg, error.message);
goto out;
}
ret = sd_bus_message_read(m, "i", &result);
if (ret < 0)
log_debug_dbus("Failed to parse dbus response message: %d", ret);
if (result)
log_debug_dbus("Bad return value from dbus service: %d", result);
out:
sd_bus_error_free(&error);
sd_bus_message_unref(m);
sd_bus_flush_close_unref(bus);
}
void set_vg_notify(struct cmd_context *cmd)
{
cmd->vg_notify = 1;
}
void set_lv_notify(struct cmd_context *cmd)
{
cmd->lv_notify = 1;
}
void set_pv_notify(struct cmd_context *cmd)
{
cmd->pv_notify = 1;
}
#else
int lvmnotify_is_supported(void)
{
return 0;
}
void lvmnotify_send(struct cmd_context *cmd)
{
}
void set_vg_notify(struct cmd_context *cmd)
{
}
void set_lv_notify(struct cmd_context *cmd)
{
}
void set_pv_notify(struct cmd_context *cmd)
{
}
#endif
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