| /* 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%i", event->idx) < 0) |
| return log_oom(); |
| |
| r = sd_device_new_from_subsystem_sysname(&device, "rfkill", sysname); |
| if (r < 0) |
| return log_full_errno(IN_SET(r, -ENOENT, -ENXIO, -ENODEV) ? 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 %i: %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) { |
| struct write_queue_item *item, *tmp; |
| |
| assert(c); |
| |
| LIST_FOREACH_SAFE(queue, item, tmp, 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 */ |
| (void) sd_notify(false, "READY=1"); |
| 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 %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(&c, &event); |
| break; |
| |
| case RFKILL_OP_DEL: |
| log_debug("An rfkill device has been removed with index %i 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 %i and type %s", event.idx, type); |
| (void) save_state_queue(&c, &event); |
| break; |
| |
| default: |
| log_debug("Unknown event %i from /dev/rfkill for index %i and type %s, ignoring.", event.op, event.idx, type); |
| break; |
| } |
| } |
| |
| return 0; |
| } |
| |
| DEFINE_MAIN_FUNCTION(run); |
