306 lines
11 KiB
C
306 lines
11 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#include <errno.h>
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#include <unistd.h>
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#include "alloc-util.h"
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#include "device-util.h"
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#include "env-file.h"
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#include "log.h"
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#include "parse-util.h"
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#include "path-util.h"
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#include "signal-util.h"
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#include "string-table.h"
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#include "string-util.h"
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#include "udev-util.h"
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static const char* const resolve_name_timing_table[_RESOLVE_NAME_TIMING_MAX] = {
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[RESOLVE_NAME_NEVER] = "never",
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[RESOLVE_NAME_LATE] = "late",
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[RESOLVE_NAME_EARLY] = "early",
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};
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DEFINE_STRING_TABLE_LOOKUP(resolve_name_timing, ResolveNameTiming);
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int udev_parse_config_full(
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unsigned *ret_children_max,
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usec_t *ret_exec_delay_usec,
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usec_t *ret_event_timeout_usec,
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ResolveNameTiming *ret_resolve_name_timing,
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int *ret_timeout_signal) {
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_cleanup_free_ char *log_val = NULL, *children_max = NULL, *exec_delay = NULL, *event_timeout = NULL, *resolve_names = NULL, *timeout_signal = NULL;
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int r;
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r = parse_env_file(NULL, "/etc/udev/udev.conf",
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"udev_log", &log_val,
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"children_max", &children_max,
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"exec_delay", &exec_delay,
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"event_timeout", &event_timeout,
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"resolve_names", &resolve_names,
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"timeout_signal", &timeout_signal);
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if (r == -ENOENT)
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return 0;
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if (r < 0)
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return r;
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if (log_val) {
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const char *log;
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size_t n;
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/* unquote */
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n = strlen(log_val);
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if (n >= 2 &&
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((log_val[0] == '"' && log_val[n-1] == '"') ||
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(log_val[0] == '\'' && log_val[n-1] == '\''))) {
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log_val[n - 1] = '\0';
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log = log_val + 1;
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} else
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log = log_val;
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/* we set the udev log level here explicitly, this is supposed
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* to regulate the code in libudev/ and udev/. */
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r = log_set_max_level_from_string_realm(LOG_REALM_UDEV, log);
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if (r < 0)
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log_syntax(NULL, LOG_WARNING, "/etc/udev/udev.conf", 0, r,
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"failed to set udev log level '%s', ignoring: %m", log);
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}
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if (ret_children_max && children_max) {
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r = safe_atou(children_max, ret_children_max);
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if (r < 0)
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log_syntax(NULL, LOG_WARNING, "/etc/udev/udev.conf", 0, r,
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"failed to parse children_max=%s, ignoring: %m", children_max);
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}
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if (ret_exec_delay_usec && exec_delay) {
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r = parse_sec(exec_delay, ret_exec_delay_usec);
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if (r < 0)
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log_syntax(NULL, LOG_WARNING, "/etc/udev/udev.conf", 0, r,
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"failed to parse exec_delay=%s, ignoring: %m", exec_delay);
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}
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if (ret_event_timeout_usec && event_timeout) {
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r = parse_sec(event_timeout, ret_event_timeout_usec);
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if (r < 0)
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log_syntax(NULL, LOG_WARNING, "/etc/udev/udev.conf", 0, r,
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"failed to parse event_timeout=%s, ignoring: %m", event_timeout);
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}
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if (ret_resolve_name_timing && resolve_names) {
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ResolveNameTiming t;
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t = resolve_name_timing_from_string(resolve_names);
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if (t < 0)
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log_syntax(NULL, LOG_WARNING, "/etc/udev/udev.conf", 0, r,
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"failed to parse resolve_names=%s, ignoring.", resolve_names);
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else
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*ret_resolve_name_timing = t;
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}
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if (ret_timeout_signal && timeout_signal) {
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r = signal_from_string(timeout_signal);
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if (r < 0)
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log_syntax(NULL, LOG_WARNING, "/etc/udev/udev.conf", 0, r,
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"failed to parse timeout_signal=%s, ignoring: %m", timeout_signal);
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else
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*ret_timeout_signal = r;
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}
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return 0;
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}
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/* Note that if -ENOENT is returned, it will be logged at debug level rather than error,
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* because it's an expected, common occurrence that the caller will handle with a fallback */
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static int device_new_from_dev_path(const char *devlink, sd_device **ret_device) {
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struct stat st;
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int r;
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assert(devlink);
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if (stat(devlink, &st) < 0)
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return log_full_errno(errno == ENOENT ? LOG_DEBUG : LOG_ERR, errno,
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"Failed to stat() %s: %m", devlink);
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if (!S_ISBLK(st.st_mode))
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return log_error_errno(SYNTHETIC_ERRNO(ENOTBLK),
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"%s does not point to a block device: %m", devlink);
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r = sd_device_new_from_devnum(ret_device, 'b', st.st_rdev);
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if (r < 0)
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return log_error_errno(r, "Failed to initialize device from %s: %m", devlink);
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return 0;
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}
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struct DeviceMonitorData {
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const char *sysname;
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const char *devlink;
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sd_device *device;
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};
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static void device_monitor_data_free(struct DeviceMonitorData *d) {
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assert(d);
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sd_device_unref(d->device);
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}
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static int device_monitor_handler(sd_device_monitor *monitor, sd_device *device, void *userdata) {
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struct DeviceMonitorData *data = userdata;
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const char *sysname;
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assert(device);
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assert(data);
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assert(data->sysname || data->devlink);
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assert(!data->device);
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if (data->sysname && sd_device_get_sysname(device, &sysname) >= 0 && streq(sysname, data->sysname))
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goto found;
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if (data->devlink) {
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const char *devlink;
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FOREACH_DEVICE_DEVLINK(device, devlink)
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if (path_equal(devlink, data->devlink))
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goto found;
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if (sd_device_get_devname(device, &devlink) >= 0 && path_equal(devlink, data->devlink))
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goto found;
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}
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return 0;
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found:
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data->device = sd_device_ref(device);
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return sd_event_exit(sd_device_monitor_get_event(monitor), 0);
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}
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static int device_wait_for_initialization_internal(
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sd_device *_device,
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const char *devlink,
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const char *subsystem,
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usec_t timeout,
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sd_device **ret) {
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_cleanup_(sd_device_monitor_unrefp) sd_device_monitor *monitor = NULL;
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_cleanup_(sd_event_source_unrefp) sd_event_source *timeout_source = NULL;
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_cleanup_(sd_event_unrefp) sd_event *event = NULL;
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/* Ensure that if !_device && devlink, device gets unrefd on errors since it will be new */
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_cleanup_(sd_device_unrefp) sd_device *device = sd_device_ref(_device);
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_cleanup_(device_monitor_data_free) struct DeviceMonitorData data = {
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.devlink = devlink,
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};
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int r;
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assert(device || (subsystem && devlink));
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/* Devlink might already exist, if it does get the device to use the sysname filtering */
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if (!device && devlink) {
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r = device_new_from_dev_path(devlink, &device);
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if (r < 0 && r != -ENOENT)
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return r;
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}
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if (device) {
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if (sd_device_get_is_initialized(device) > 0) {
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if (ret)
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*ret = sd_device_ref(device);
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return 0;
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}
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/* We need either the sysname or the devlink for filtering */
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assert_se(sd_device_get_sysname(device, &data.sysname) >= 0 || devlink);
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}
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/* Wait until the device is initialized, so that we can get access to the ID_PATH property */
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r = sd_event_new(&event);
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if (r < 0)
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return log_error_errno(r, "Failed to get default event: %m");
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r = sd_device_monitor_new(&monitor);
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if (r < 0)
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return log_error_errno(r, "Failed to acquire monitor: %m");
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if (device && !subsystem) {
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r = sd_device_get_subsystem(device, &subsystem);
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if (r < 0 && r != -ENOENT)
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return log_device_error_errno(device, r, "Failed to get subsystem: %m");
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}
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if (subsystem) {
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r = sd_device_monitor_filter_add_match_subsystem_devtype(monitor, subsystem, NULL);
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if (r < 0)
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return log_error_errno(r, "Failed to add %s subsystem match to monitor: %m", subsystem);
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}
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r = sd_device_monitor_attach_event(monitor, event);
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if (r < 0)
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return log_error_errno(r, "Failed to attach event to device monitor: %m");
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r = sd_device_monitor_start(monitor, device_monitor_handler, &data);
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if (r < 0)
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return log_error_errno(r, "Failed to start device monitor: %m");
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if (timeout != USEC_INFINITY) {
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r = sd_event_add_time_relative(
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event, &timeout_source,
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CLOCK_MONOTONIC, timeout, 0,
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NULL, INT_TO_PTR(-ETIMEDOUT));
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if (r < 0)
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return log_error_errno(r, "Failed to add timeout event source: %m");
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}
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/* Check again, maybe things changed. Udev will re-read the db if the device wasn't initialized
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* yet. */
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if (!device && devlink) {
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r = device_new_from_dev_path(devlink, &device);
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if (r < 0 && r != -ENOENT)
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return r;
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}
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if (device && sd_device_get_is_initialized(device) > 0) {
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if (ret)
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*ret = sd_device_ref(device);
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return 0;
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}
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r = sd_event_loop(event);
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if (r < 0)
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return log_error_errno(r, "Failed to wait for device to be initialized: %m");
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if (ret)
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*ret = TAKE_PTR(data.device);
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return 0;
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}
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int device_wait_for_initialization(sd_device *device, const char *subsystem, usec_t timeout, sd_device **ret) {
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return device_wait_for_initialization_internal(device, NULL, subsystem, timeout, ret);
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}
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int device_wait_for_devlink(const char *devlink, const char *subsystem, usec_t timeout, sd_device **ret) {
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return device_wait_for_initialization_internal(NULL, devlink, subsystem, timeout, ret);
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}
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int device_is_renaming(sd_device *dev) {
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int r;
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assert(dev);
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r = sd_device_get_property_value(dev, "ID_RENAMING", NULL);
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if (r == -ENOENT)
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return false;
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if (r < 0)
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return r;
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return true;
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}
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bool device_for_action(sd_device *dev, DeviceAction action) {
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DeviceAction a;
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assert(dev);
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if (device_get_action(dev, &a) < 0)
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return false;
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return a == action;
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}
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