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/*
* dhcpcd - DHCP client daemon
* Copyright (c) 2006-2013 Roy Marples <roy@marples.name>
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifdef LIBUDEV_NOINIT
# define LIBUDEV_I_KNOW_THE_API_IS_SUBJECT_TO_CHANGE
# warning This version of udev is too old does not support
# warning per device initialization checks.
# warning As such, dhcpcd will need to depend on the
# warning udev-settle service or similar if starting
# warning in master mode.
#endif
#include <libudev.h>
#include <string.h>
#include <syslog.h>
#include "../common.h"
#include "../dev.h"
static const char udev_name[]="udev";
static struct udev *udev;
static struct udev_monitor *monitor;
static const struct dev_dhcpcd *dhcpcd;
static int
udev_listening(void)
{
return monitor ? 1 : 0;
}
static int
udev_initialized(const char *ifname)
{
struct udev_device *device;
int r;
device = udev_device_new_from_subsystem_sysname(udev, "net", ifname);
if (device) {
#ifndef LIBUDEV_NOINIT
r = udev_device_get_is_initialized(device);
#else
r = 1;
#endif
udev_device_unref(device);
} else
r = 0;
return r;
}
static int
udev_handle_device(void)
{
struct udev_device *device;
const char *subsystem, *ifname, *action;
device = udev_monitor_receive_device(monitor);
if (device == NULL) {
syslog(LOG_ERR, "libudev: received NULL device");
return -1;
}
subsystem = udev_device_get_subsystem(device);
ifname = udev_device_get_sysname(device);
action = udev_device_get_action(device);
/* udev filter documentation says "usually" so double check */
if (strcmp(subsystem, "net") == 0) {
syslog(LOG_DEBUG, "%s: libudev: %s", ifname, action);
if (strcmp(action, "add") == 0 || strcmp(action, "move") == 0)
dhcpcd->handle_interface(1, ifname);
else if (strcmp(action, "remove") == 0)
dhcpcd->handle_interface(-1, ifname);
}
udev_device_unref(device);
return 1;
}
static void
udev_stop(void)
{
if (monitor) {
udev_monitor_unref(monitor);
monitor = NULL;
}
if (udev) {
udev_unref(udev);
udev = NULL;
}
}
static int
udev_start(void)
{
int fd;
if (udev) {
syslog(LOG_ERR, "udev: already started");
return -1;
}
syslog(LOG_DEBUG, "udev: starting");
udev = udev_new();
if (udev == NULL) {
syslog(LOG_ERR, "udev_new: %m");
return -1;
}
monitor = udev_monitor_new_from_netlink(udev, "udev");
if (monitor == NULL) {
syslog(LOG_ERR, "udev_monitor_new_from_netlink: %m");
goto bad;
}
#ifndef LIBUDEV_NOFILTER
if (udev_monitor_filter_add_match_subsystem_devtype(monitor,
"net", NULL) != 0)
{
syslog(LOG_ERR,
"udev_monitor_filter_add_match_subsystem_devtype: %m");
goto bad;
}
#endif
if (udev_monitor_enable_receiving(monitor) != 0) {
syslog(LOG_ERR, "udev_monitor_enable_receiving: %m");
goto bad;
}
fd = udev_monitor_get_fd(monitor);
if (fd == -1) {
syslog(LOG_ERR, "udev_monitor_get_fd: %m");
goto bad;
}
return fd;
bad:
udev_stop();
return -1;
}
int
dev_init(struct dev *dev, const struct dev_dhcpcd *dev_dhcpcd)
{
dev->name = udev_name;
dev->initialized = udev_initialized;
dev->listening = udev_listening;
dev->handle_device = udev_handle_device;
dev->stop = udev_stop;
dev->start = udev_start;
dhcpcd = dev_dhcpcd;
return 0;
}
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