diff options
Diffstat (limited to 'dhcpcd/dev/udev.c')
| -rw-r--r-- | dhcpcd/dev/udev.c | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/dhcpcd/dev/udev.c b/dhcpcd/dev/udev.c new file mode 100644 index 00000000..0b02ffb8 --- /dev/null +++ b/dhcpcd/dev/udev.c @@ -0,0 +1,179 @@ +/* + * 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; +} |