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-rw-r--r--src/rfkill/rfkill.c380
1 files changed, 380 insertions, 0 deletions
diff --git a/src/rfkill/rfkill.c b/src/rfkill/rfkill.c
new file mode 100644
index 0000000..8aec9b2
--- /dev/null
+++ b/src/rfkill/rfkill.c
@@ -0,0 +1,380 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <fcntl.h>
+#include <linux/rfkill.h>
+#include <poll.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "sd-daemon.h"
+#include "sd-device.h"
+
+#include "alloc-util.h"
+#include "device-util.h"
+#include "escape.h"
+#include "fd-util.h"
+#include "fileio.h"
+#include "io-util.h"
+#include "list.h"
+#include "main-func.h"
+#include "mkdir.h"
+#include "parse-util.h"
+#include "reboot-util.h"
+#include "string-table.h"
+#include "string-util.h"
+#include "udev-util.h"
+#include "util.h"
+
+/* Note that any write is delayed until exit and the rfkill state will not be
+ * stored for rfkill indices that disappear after a change. */
+#define EXIT_USEC (5 * USEC_PER_SEC)
+
+typedef struct write_queue_item {
+ LIST_FIELDS(struct write_queue_item, queue);
+ int rfkill_idx;
+ char *file;
+ int state;
+} write_queue_item;
+
+typedef struct Context {
+ LIST_HEAD(write_queue_item, write_queue);
+ int rfkill_fd;
+} Context;
+
+static struct write_queue_item* write_queue_item_free(struct write_queue_item *item) {
+ if (!item)
+ return NULL;
+
+ free(item->file);
+ return mfree(item);
+}
+
+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(
+ const struct rfkill_event *event,
+ sd_device **ret) {
+ _cleanup_(sd_device_unrefp) sd_device *device = NULL;
+ _cleanup_free_ char *sysname = NULL;
+ const char *name;
+ int r;
+
+ assert(event);
+ assert(ret);
+
+ if (asprintf(&sysname, "rfkill%u", event->idx) < 0)
+ return log_oom();
+
+ r = sd_device_new_from_subsystem_sysname(&device, "rfkill", sysname);
+ if (r < 0)
+ return log_full_errno(ERRNO_IS_DEVICE_ABSENT(r) ? LOG_DEBUG : LOG_ERR, r,
+ "Failed to open device '%s': %m", sysname);
+
+ r = sd_device_get_sysattr_value(device, "name", &name);
+ if (r < 0)
+ return log_device_debug_errno(device, r, "Device has no name, ignoring: %m");
+
+ log_device_debug(device, "Operating on rfkill device '%s'.", name);
+
+ *ret = TAKE_PTR(device);
+ return 0;
+}
+
+static int determine_state_file(
+ const struct rfkill_event *event,
+ char **ret) {
+
+ _cleanup_(sd_device_unrefp) sd_device *d = NULL, *device = NULL;
+ const char *path_id, *type;
+ char *state_file;
+ int r;
+
+ assert(event);
+ assert(ret);
+
+ r = find_device(event, &d);
+ if (r < 0)
+ return r;
+
+ r = device_wait_for_initialization(d, "rfkill", USEC_INFINITY, &device);
+ if (r < 0)
+ return r;
+
+ assert_se(type = rfkill_type_to_string(event->type));
+
+ if (sd_device_get_property_value(device, "ID_PATH", &path_id) >= 0) {
+ _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);
+ } else
+ state_file = strjoin("/var/lib/systemd/rfkill/", type);
+
+ if (!state_file)
+ return log_oom();
+
+ *ret = state_file;
+ return 0;
+}
+
+static int load_state(Context *c, const struct rfkill_event *event) {
+ _cleanup_free_ char *state_file = NULL, *value = NULL;
+ int b, r;
+
+ assert(c);
+ assert(c->rfkill_fd >= 0);
+ assert(event);
+
+ if (shall_restore_state() == 0)
+ return 0;
+
+ r = determine_state_file(event, &state_file);
+ if (r < 0)
+ return r;
+
+ r = read_one_line_file(state_file, &value);
+ if (IN_SET(r, -ENOENT, 0)) {
+ /* No state file or it's truncated? Then save the current state */
+
+ r = write_string_file(state_file, one_zero(event->soft), WRITE_STRING_FILE_CREATE|WRITE_STRING_FILE_ATOMIC|WRITE_STRING_FILE_MKDIR_0755);
+ 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);
+
+ struct rfkill_event we = {
+ .idx = event->idx,
+ .op = RFKILL_OP_CHANGE,
+ .soft = b,
+ };
+ assert_cc(offsetof(struct rfkill_event, op) < RFKILL_EVENT_SIZE_V1);
+ assert_cc(offsetof(struct rfkill_event, soft) < RFKILL_EVENT_SIZE_V1);
+
+ ssize_t l = write(c->rfkill_fd, &we, sizeof we);
+ if (l < 0)
+ return log_error_errno(errno, "Failed to restore rfkill state for %u: %m", event->idx);
+ if ((size_t)l < RFKILL_EVENT_SIZE_V1) /* l cannot be < 0 here. Cast to fix -Werror=sign-compare */
+ return log_error_errno(SYNTHETIC_ERRNO(EIO),
+ "Couldn't write rfkill event structure, too short (wrote %zd of %zu bytes).",
+ l, sizeof we);
+ log_debug("Writing struct rfkill_event successful (%zd of %zu bytes).", l, sizeof we);
+
+ log_debug("Loaded state '%s' from %s.", one_zero(b), state_file);
+ return 0;
+}
+
+static void save_state_queue_remove(Context *c, int idx, const char *state_file) {
+ assert(c);
+
+ LIST_FOREACH(queue, item, c->write_queue)
+ if ((state_file && streq(item->file, state_file)) || idx == item->rfkill_idx) {
+ log_debug("Canceled previous save state of '%s' to %s.", one_zero(item->state), item->file);
+ LIST_REMOVE(queue, c->write_queue, item);
+ write_queue_item_free(item);
+ }
+}
+
+static int save_state_queue(Context *c, const struct rfkill_event *event) {
+ _cleanup_free_ char *state_file = NULL;
+ struct write_queue_item *item;
+ int r;
+
+ assert(c);
+ assert(c->rfkill_fd >= 0);
+ assert(event);
+
+ r = determine_state_file(event, &state_file);
+ if (r < 0)
+ return r;
+
+ save_state_queue_remove(c, event->idx, state_file);
+
+ item = new0(struct write_queue_item, 1);
+ if (!item)
+ return -ENOMEM;
+
+ item->file = TAKE_PTR(state_file);
+ item->rfkill_idx = event->idx;
+ item->state = event->soft;
+
+ LIST_APPEND(queue, c->write_queue, item);
+
+ return 0;
+}
+
+static int save_state_cancel(Context *c, const struct rfkill_event *event) {
+ _cleanup_free_ char *state_file = NULL;
+ int r;
+
+ assert(c);
+ assert(c->rfkill_fd >= 0);
+ assert(event);
+
+ r = determine_state_file(event, &state_file);
+ save_state_queue_remove(c, event->idx, state_file);
+ if (r < 0)
+ return r;
+
+ return 0;
+}
+
+static int save_state_write_one(struct write_queue_item *item) {
+ int r;
+
+ r = write_string_file(item->file, one_zero(item->state), WRITE_STRING_FILE_CREATE|WRITE_STRING_FILE_ATOMIC|WRITE_STRING_FILE_MKDIR_0755);
+ if (r < 0)
+ return log_error_errno(r, "Failed to write state file %s: %m", item->file);
+
+ log_debug("Saved state '%s' to %s.", one_zero(item->state), item->file);
+ return 0;
+}
+
+static void context_save_and_clear(Context *c) {
+ struct write_queue_item *i;
+
+ assert(c);
+
+ while ((i = c->write_queue)) {
+ LIST_REMOVE(queue, c->write_queue, i);
+ (void) save_state_write_one(i);
+ write_queue_item_free(i);
+ }
+
+ safe_close(c->rfkill_fd);
+}
+
+static int run(int argc, char *argv[]) {
+ _cleanup_(context_save_and_clear) Context c = { .rfkill_fd = -1 };
+ bool ready = false;
+ int r, n;
+
+ if (argc > 1)
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "This program requires no arguments.");
+
+ log_setup();
+
+ umask(0022);
+
+ n = sd_listen_fds(false);
+ if (n < 0)
+ return log_error_errno(n, "Failed to determine whether we got any file descriptors passed: %m");
+ if (n > 1)
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Got too many file descriptors.");
+
+ if (n == 0) {
+ c.rfkill_fd = open("/dev/rfkill", O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK);
+ if (c.rfkill_fd < 0) {
+ if (errno == ENOENT) {
+ log_debug_errno(errno, "Missing rfkill subsystem, or no device present, exiting.");
+ return 0;
+ }
+
+ return log_error_errno(errno, "Failed to open /dev/rfkill: %m");
+ }
+ } else {
+ c.rfkill_fd = SD_LISTEN_FDS_START;
+
+ r = fd_nonblock(c.rfkill_fd, 1);
+ if (r < 0)
+ return log_error_errno(r, "Failed to make /dev/rfkill socket non-blocking: %m");
+ }
+
+ for (;;) {
+ struct rfkill_event event = {};
+
+ ssize_t l = read(c.rfkill_fd, &event, sizeof event);
+ if (l < 0) {
+ if (errno != EAGAIN)
+ return log_error_errno(errno, "Failed to read from /dev/rfkill: %m");
+
+ if (!ready) {
+ /* Notify manager that we are now finished with processing whatever was
+ * queued */
+ r = sd_notify(false, "READY=1");
+ if (r < 0)
+ log_warning_errno(r, "Failed to send readiness notification, ignoring: %m");
+
+ ready = true;
+ }
+
+ /* Hang around for a bit, maybe there's more coming */
+
+ r = fd_wait_for_event(c.rfkill_fd, POLLIN, EXIT_USEC);
+ if (r == -EINTR)
+ continue;
+ if (r < 0)
+ return log_error_errno(r, "Failed to poll() on device: %m");
+ if (r > 0)
+ continue;
+
+ log_debug("All events read and idle, exiting.");
+ break;
+ }
+
+ if ((size_t)l < RFKILL_EVENT_SIZE_V1) /* l cannot be < 0 here. Cast to fix -Werror=sign-compare */
+ return log_error_errno(SYNTHETIC_ERRNO(EIO), "Short read of struct rfkill_event: (%zd < %zu)",
+ l, (size_t) RFKILL_EVENT_SIZE_V1); /* Casting necessary to make compiling with different kernel versions happy */
+ log_debug("Reading struct rfkill_event: got %zd bytes.", l);
+
+ /* The event structure has more fields. We only care about the first few, so it's OK if we
+ * don't read the full structure. */
+ assert_cc(offsetof(struct rfkill_event, op) < RFKILL_EVENT_SIZE_V1);
+ assert_cc(offsetof(struct rfkill_event, type) < RFKILL_EVENT_SIZE_V1);
+
+ const char *type = rfkill_type_to_string(event.type);
+ if (!type) {
+ log_debug("An rfkill device of unknown type %u discovered, ignoring.", event.type);
+ continue;
+ }
+
+ switch (event.op) {
+
+ case RFKILL_OP_ADD:
+ log_debug("A new rfkill device has been added with index %u and type %s.", event.idx, type);
+ (void) load_state(&c, &event);
+ break;
+
+ case RFKILL_OP_DEL:
+ log_debug("An rfkill device has been removed with index %u and type %s", event.idx, type);
+ (void) save_state_cancel(&c, &event);
+ break;
+
+ case RFKILL_OP_CHANGE:
+ log_debug("An rfkill device has changed state with index %u and type %s", event.idx, type);
+ (void) save_state_queue(&c, &event);
+ break;
+
+ default:
+ log_debug("Unknown event %u from /dev/rfkill for index %u and type %s, ignoring.", event.op, event.idx, type);
+ break;
+ }
+ }
+
+ return 0;
+}
+
+DEFINE_MAIN_FUNCTION(run);
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-09 17:40:05 +0000