| /* |
| * dhcpcd - DHCP client daemon |
| * Copyright (c) 2006-2015 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 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 *ctx) |
| { |
| 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(ctx, 1, ifname); |
| else if (strcmp(action, "remove") == 0) |
| dhcpcd.handle_interface(ctx, -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; |
| } |