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Diffstat (limited to 'src/grp-initprogs/systemd-rfkill/rfkill.c')
-rw-r--r--src/grp-initprogs/systemd-rfkill/rfkill.c427
1 files changed, 427 insertions, 0 deletions
diff --git a/src/grp-initprogs/systemd-rfkill/rfkill.c b/src/grp-initprogs/systemd-rfkill/rfkill.c
new file mode 100644
index 0000000000..6a463d0f92
--- /dev/null
+++ b/src/grp-initprogs/systemd-rfkill/rfkill.c
@@ -0,0 +1,427 @@
+/***
+ This file is part of systemd.
+
+ Copyright 2013 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <poll.h>
+
+#include <linux/rfkill.h>
+
+#include <libudev.h>
+#include <systemd/sd-daemon.h>
+
+#include "systemd-basic/alloc-util.h"
+#include "systemd-basic/escape.h"
+#include "systemd-basic/fd-util.h"
+#include "systemd-basic/fileio.h"
+#include "systemd-basic/io-util.h"
+#include "systemd-basic/mkdir.h"
+#include "systemd-basic/parse-util.h"
+#include "systemd-basic/proc-cmdline.h"
+#include "systemd-basic/string-table.h"
+#include "systemd-basic/string-util.h"
+#include "systemd-basic/util.h"
+#include "systemd-shared/udev-util.h"
+
+#define EXIT_USEC (5 * USEC_PER_SEC)
+
+static const char* const rfkill_type_table[NUM_RFKILL_TYPES] = {
+ [RFKILL_TYPE_ALL] = "all",
+ [RFKILL_TYPE_WLAN] = "wlan",
+ [RFKILL_TYPE_BLUETOOTH] = "bluetooth",
+ [RFKILL_TYPE_UWB] = "uwb",
+ [RFKILL_TYPE_WIMAX] = "wimax",
+ [RFKILL_TYPE_WWAN] = "wwan",
+ [RFKILL_TYPE_GPS] = "gps",
+ [RFKILL_TYPE_FM] = "fm",
+ [RFKILL_TYPE_NFC] = "nfc",
+};
+
+DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(rfkill_type, int);
+
+static int find_device(
+ struct udev *udev,
+ const struct rfkill_event *event,
+ struct udev_device **ret) {
+
+ _cleanup_free_ char *sysname = NULL;
+ struct udev_device *device;
+ const char *name;
+
+ assert(udev);
+ assert(event);
+ assert(ret);
+
+ if (asprintf(&sysname, "rfkill%i", event->idx) < 0)
+ return log_oom();
+
+ device = udev_device_new_from_subsystem_sysname(udev, "rfkill", sysname);
+ if (!device)
+ return log_full_errno(errno == ENOENT ? LOG_DEBUG : LOG_ERR, errno, "Failed to open device: %m");
+
+ name = udev_device_get_sysattr_value(device, "name");
+ if (!name) {
+ log_debug("Device has no name, ignoring.");
+ udev_device_unref(device);
+ return -ENOENT;
+ }
+
+ log_debug("Operating on rfkill device '%s'.", name);
+
+ *ret = device;
+ return 0;
+}
+
+static int wait_for_initialized(
+ struct udev *udev,
+ struct udev_device *device,
+ struct udev_device **ret) {
+
+ _cleanup_udev_monitor_unref_ struct udev_monitor *monitor = NULL;
+ struct udev_device *d;
+ const char *sysname;
+ int watch_fd, r;
+
+ assert(udev);
+ assert(device);
+ assert(ret);
+
+ if (udev_device_get_is_initialized(device) != 0) {
+ *ret = udev_device_ref(device);
+ return 0;
+ }
+
+ assert_se(sysname = udev_device_get_sysname(device));
+
+ /* Wait until the device is initialized, so that we can get
+ * access to the ID_PATH property */
+
+ monitor = udev_monitor_new_from_netlink(udev, "udev");
+ if (!monitor)
+ return log_error_errno(errno, "Failed to acquire monitor: %m");
+
+ r = udev_monitor_filter_add_match_subsystem_devtype(monitor, "rfkill", NULL);
+ if (r < 0)
+ return log_error_errno(r, "Failed to add rfkill udev match to monitor: %m");
+
+ r = udev_monitor_enable_receiving(monitor);
+ if (r < 0)
+ return log_error_errno(r, "Failed to enable udev receiving: %m");
+
+ watch_fd = udev_monitor_get_fd(monitor);
+ if (watch_fd < 0)
+ return log_error_errno(watch_fd, "Failed to get watch fd: %m");
+
+ /* Check again, maybe things changed */
+ d = udev_device_new_from_subsystem_sysname(udev, "rfkill", sysname);
+ if (!d)
+ return log_full_errno(errno == ENOENT ? LOG_DEBUG : LOG_ERR, errno, "Failed to open device: %m");
+
+ if (udev_device_get_is_initialized(d) != 0) {
+ *ret = d;
+ return 0;
+ }
+
+ for (;;) {
+ _cleanup_udev_device_unref_ struct udev_device *t = NULL;
+
+ r = fd_wait_for_event(watch_fd, POLLIN, USEC_INFINITY);
+ if (r == -EINTR)
+ continue;
+ if (r < 0)
+ return log_error_errno(r, "Failed to watch udev monitor: %m");
+
+ t = udev_monitor_receive_device(monitor);
+ if (!t)
+ continue;
+
+ if (streq_ptr(udev_device_get_sysname(device), sysname)) {
+ *ret = udev_device_ref(t);
+ return 0;
+ }
+ }
+}
+
+static int determine_state_file(
+ struct udev *udev,
+ const struct rfkill_event *event,
+ struct udev_device *d,
+ char **ret) {
+
+ _cleanup_udev_device_unref_ struct udev_device *device = NULL;
+ const char *path_id, *type;
+ char *state_file;
+ int r;
+
+ assert(event);
+ assert(d);
+ assert(ret);
+
+ r = wait_for_initialized(udev, d, &device);
+ if (r < 0)
+ return r;
+
+ assert_se(type = rfkill_type_to_string(event->type));
+
+ path_id = udev_device_get_property_value(device, "ID_PATH");
+ if (path_id) {
+ _cleanup_free_ char *escaped_path_id = NULL;
+
+ escaped_path_id = cescape(path_id);
+ if (!escaped_path_id)
+ return log_oom();
+
+ state_file = strjoin("/var/lib/systemd/rfkill/", escaped_path_id, ":", type, NULL);
+ } else
+ state_file = strjoin("/var/lib/systemd/rfkill/", type, NULL);
+
+ if (!state_file)
+ return log_oom();
+
+ *ret = state_file;
+ return 0;
+}
+
+static int load_state(
+ int rfkill_fd,
+ struct udev *udev,
+ const struct rfkill_event *event) {
+
+ _cleanup_udev_device_unref_ struct udev_device *device = NULL;
+ _cleanup_free_ char *state_file = NULL, *value = NULL;
+ struct rfkill_event we;
+ ssize_t l;
+ int b, r;
+
+ assert(rfkill_fd >= 0);
+ assert(udev);
+ assert(event);
+
+ if (shall_restore_state() == 0)
+ return 0;
+
+ r = find_device(udev, event, &device);
+ if (r < 0)
+ return r;
+
+ r = determine_state_file(udev, event, device, &state_file);
+ if (r < 0)
+ return r;
+
+ r = read_one_line_file(state_file, &value);
+ if (r == -ENOENT) {
+ /* No state file? Then save the current state */
+
+ r = write_string_file(state_file, one_zero(event->soft), WRITE_STRING_FILE_CREATE|WRITE_STRING_FILE_ATOMIC);
+ if (r < 0)
+ return log_error_errno(r, "Failed to write state file %s: %m", state_file);
+
+ log_debug("Saved state '%s' to %s.", one_zero(event->soft), state_file);
+ return 0;
+ }
+ if (r < 0)
+ return log_error_errno(r, "Failed to read state file %s: %m", state_file);
+
+ b = parse_boolean(value);
+ if (b < 0)
+ return log_error_errno(b, "Failed to parse state file %s: %m", state_file);
+
+ we = (struct rfkill_event) {
+ .op = RFKILL_OP_CHANGE,
+ .idx = event->idx,
+ .soft = b,
+ };
+
+ l = write(rfkill_fd, &we, sizeof(we));
+ if (l < 0)
+ return log_error_errno(errno, "Failed to restore rfkill state for %i: %m", event->idx);
+ if (l != sizeof(we)) {
+ log_error("Couldn't write rfkill event structure, too short.");
+ return -EIO;
+ }
+
+ log_debug("Loaded state '%s' from %s.", one_zero(b), state_file);
+ return 0;
+}
+
+static int save_state(
+ int rfkill_fd,
+ struct udev *udev,
+ const struct rfkill_event *event) {
+
+ _cleanup_udev_device_unref_ struct udev_device *device = NULL;
+ _cleanup_free_ char *state_file = NULL;
+ int r;
+
+ assert(rfkill_fd >= 0);
+ assert(udev);
+ assert(event);
+
+ r = find_device(udev, event, &device);
+ if (r < 0)
+ return r;
+
+ r = determine_state_file(udev, event, device, &state_file);
+ if (r < 0)
+ return r;
+
+ r = write_string_file(state_file, one_zero(event->soft), WRITE_STRING_FILE_CREATE|WRITE_STRING_FILE_ATOMIC);
+ if (r < 0)
+ return log_error_errno(r, "Failed to write state file %s: %m", state_file);
+
+ log_debug("Saved state '%s' to %s.", one_zero(event->soft), state_file);
+ return 0;
+}
+
+int main(int argc, char *argv[]) {
+ _cleanup_udev_unref_ struct udev *udev = NULL;
+ _cleanup_close_ int rfkill_fd = -1;
+ bool ready = false;
+ int r, n;
+
+ if (argc > 1) {
+ log_error("This program requires no arguments.");
+ return EXIT_FAILURE;
+ }
+
+ log_set_target(LOG_TARGET_AUTO);
+ log_parse_environment();
+ log_open();
+
+ umask(0022);
+
+ udev = udev_new();
+ if (!udev) {
+ r = log_oom();
+ goto finish;
+ }
+
+ r = mkdir_p("/var/lib/systemd/rfkill", 0755);
+ if (r < 0) {
+ log_error_errno(r, "Failed to create rfkill directory: %m");
+ goto finish;
+ }
+
+ n = sd_listen_fds(false);
+ if (n < 0) {
+ r = log_error_errno(n, "Failed to determine whether we got any file descriptors passed: %m");
+ goto finish;
+ }
+ if (n > 1) {
+ log_error("Got too many file descriptors.");
+ r = -EINVAL;
+ goto finish;
+ }
+
+ if (n == 0) {
+ rfkill_fd = open("/dev/rfkill", O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK);
+ if (rfkill_fd < 0) {
+ if (errno == ENOENT) {
+ log_debug_errno(errno, "Missing rfkill subsystem, or no device present, exiting.");
+ r = 0;
+ goto finish;
+ }
+
+ r = log_error_errno(errno, "Failed to open /dev/rfkill: %m");
+ goto finish;
+ }
+ } else {
+ rfkill_fd = SD_LISTEN_FDS_START;
+
+ r = fd_nonblock(rfkill_fd, 1);
+ if (r < 0) {
+ log_error_errno(r, "Failed to make /dev/rfkill socket non-blocking: %m");
+ goto finish;
+ }
+ }
+
+ for (;;) {
+ struct rfkill_event event;
+ const char *type;
+ ssize_t l;
+
+ l = read(rfkill_fd, &event, sizeof(event));
+ if (l < 0) {
+ if (errno == EAGAIN) {
+
+ if (!ready) {
+ /* Notify manager that we are
+ * now finished with
+ * processing whatever was
+ * queued */
+ (void) sd_notify(false, "READY=1");
+ ready = true;
+ }
+
+ /* Hang around for a bit, maybe there's more coming */
+
+ r = fd_wait_for_event(rfkill_fd, POLLIN, EXIT_USEC);
+ if (r == -EINTR)
+ continue;
+ if (r < 0) {
+ log_error_errno(r, "Failed to poll() on device: %m");
+ goto finish;
+ }
+ if (r > 0)
+ continue;
+
+ log_debug("All events read and idle, exiting.");
+ break;
+ }
+
+ log_error_errno(errno, "Failed to read from /dev/rfkill: %m");
+ }
+
+ if (l != RFKILL_EVENT_SIZE_V1) {
+ log_error("Read event structure of invalid size.");
+ r = -EIO;
+ goto finish;
+ }
+
+ type = rfkill_type_to_string(event.type);
+ if (!type) {
+ log_debug("An rfkill device of unknown type %i discovered, ignoring.", event.type);
+ continue;
+ }
+
+ switch (event.op) {
+
+ case RFKILL_OP_ADD:
+ log_debug("A new rfkill device has been added with index %i and type %s.", event.idx, type);
+ (void) load_state(rfkill_fd, udev, &event);
+ break;
+
+ case RFKILL_OP_DEL:
+ log_debug("An rfkill device has been removed with index %i and type %s", event.idx, type);
+ break;
+
+ case RFKILL_OP_CHANGE:
+ log_debug("An rfkill device has changed state with index %i and type %s", event.idx, type);
+ (void) save_state(rfkill_fd, udev, &event);
+ break;
+
+ default:
+ log_debug("Unknown event %i from /dev/rfkill for index %i and type %s, ignoring.", event.op, event.idx, type);
+ break;
+ }
+ }
+
+ r = 0;
+
+finish:
+ return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-01 12:24:46 +0000