[thirdparty/systemd.git] / src / shared / udev-util.c

/* SPDX-License-Identifier: LGPL-2.1+ */

#include <errno.h>

#include "alloc-util.h"
#include "env-file.h"
#include "log.h"
#include "parse-util.h"
#include "string-table.h"
#include "string-util.h"
#include "udev-util.h"

static const char* const resolve_name_timing_table[_RESOLVE_NAME_TIMING_MAX] = {
        [RESOLVE_NAME_NEVER] = "never",
        [RESOLVE_NAME_LATE] = "late",
        [RESOLVE_NAME_EARLY] = "early",
};

DEFINE_STRING_TABLE_LOOKUP(resolve_name_timing, ResolveNameTiming);

int udev_parse_config_full(
                unsigned *ret_children_max,
                usec_t *ret_exec_delay_usec,
                usec_t *ret_event_timeout_usec,
                ResolveNameTiming *ret_resolve_name_timing) {

        _cleanup_free_ char *log_val = NULL, *children_max = NULL, *exec_delay = NULL, *event_timeout = NULL, *resolve_names = NULL;
        int r;

        r = parse_env_file(NULL, "/etc/udev/udev.conf",
                           "udev_log", &log_val,
                           "children_max", &children_max,
                           "exec_delay", &exec_delay,
                           "event_timeout", &event_timeout,
                           "resolve_names", &resolve_names);
        if (r == -ENOENT)
                return 0;
        if (r < 0)
                return r;

        if (log_val) {
                const char *log;
                size_t n;

                /* unquote */
                n = strlen(log_val);
                if (n >= 2 &&
                    ((log_val[0] == '"' && log_val[n-1] == '"') ||
                     (log_val[0] == '\'' && log_val[n-1] == '\''))) {
                        log_val[n - 1] = '\0';
                        log = log_val + 1;
                } else
                        log = log_val;

                /* we set the udev log level here explicitly, this is supposed
                 * to regulate the code in libudev/ and udev/. */
                r = log_set_max_level_from_string_realm(LOG_REALM_UDEV, log);
                if (r < 0)
                        log_debug_errno(r, "/etc/udev/udev.conf: failed to set udev log level '%s', ignoring: %m", log);
        }

        if (ret_children_max && children_max) {
                r = safe_atou(children_max, ret_children_max);
                if (r < 0)
                        log_notice_errno(r, "/etc/udev/udev.conf: failed to set parse children_max=%s, ignoring: %m", children_max);
        }

        if (ret_exec_delay_usec && exec_delay) {
                r = parse_sec(exec_delay, ret_exec_delay_usec);
                if (r < 0)
                        log_notice_errno(r, "/etc/udev/udev.conf: failed to set parse exec_delay=%s, ignoring: %m", exec_delay);
        }

        if (ret_event_timeout_usec && event_timeout) {
                r = parse_sec(event_timeout, ret_event_timeout_usec);
                if (r < 0)
                        log_notice_errno(r, "/etc/udev/udev.conf: failed to set parse event_timeout=%s, ignoring: %m", event_timeout);
        }

        if (ret_resolve_name_timing && resolve_names) {
                ResolveNameTiming t;

                t = resolve_name_timing_from_string(resolve_names);
                if (t < 0)
                        log_notice("/etc/udev/udev.conf: failed to set parse resolve_names=%s, ignoring.", resolve_names);
                else
                        *ret_resolve_name_timing = t;
        }

        return 0;
}

struct DeviceMonitorData {
        const char *sysname;
        sd_device *device;
};

static int device_monitor_handler(sd_device_monitor *monitor, sd_device *device, void *userdata) {
        struct DeviceMonitorData *data = userdata;
        const char *sysname;

        assert(device);
        assert(data);
        assert(data->sysname);
        assert(!data->device);

        if (sd_device_get_sysname(device, &sysname) >= 0 && streq(sysname, data->sysname)) {
                data->device = sd_device_ref(device);
                return sd_event_exit(sd_device_monitor_get_event(monitor), 0);
        }

        return 0;
}

int device_wait_for_initialization(sd_device *device, const char *subsystem, sd_device **ret) {
        _cleanup_(sd_device_monitor_unrefp) sd_device_monitor *monitor = NULL;
        _cleanup_(sd_event_unrefp) sd_event *event = NULL;
        struct DeviceMonitorData data = {};
        int r;

        assert(device);
        assert(subsystem);

        if (sd_device_get_is_initialized(device) > 0) {
                if (ret)
                        *ret = sd_device_ref(device);
                return 0;
        }

        assert_se(sd_device_get_sysname(device, &data.sysname) >= 0);

        /* Wait until the device is initialized, so that we can get access to the ID_PATH property */

        r = sd_event_new(&event);
        if (r < 0)
                return log_error_errno(r, "Failed to get default event: %m");

        r = sd_device_monitor_new(&monitor);
        if (r < 0)
                return log_error_errno(r, "Failed to acquire monitor: %m");

        r = sd_device_monitor_filter_add_match_subsystem_devtype(monitor, subsystem, NULL);
        if (r < 0)
                return log_error_errno(r, "Failed to add %s subsystem match to monitor: %m", subsystem);

        r = sd_device_monitor_attach_event(monitor, event);
        if (r < 0)
                return log_error_errno(r, "Failed to attach event to device monitor: %m");

        r = sd_device_monitor_start(monitor, device_monitor_handler, &data);
        if (r < 0)
                return log_error_errno(r, "Failed to start device monitor: %m");

        /* Check again, maybe things changed. Udev will re-read the db if the device wasn't initialized
         * yet. */
        if (sd_device_get_is_initialized(device) > 0) {
                if (ret)
                        *ret = sd_device_ref(device);
                return 0;
        }

        r = sd_event_loop(event);
        if (r < 0)
                return log_error_errno(r, "Event loop failed: %m");

        if (ret)
                *ret = TAKE_PTR(data.device);
        return 0;
}

int device_is_renaming(sd_device *dev) {
        int r;

        assert(dev);

        r = sd_device_get_property_value(dev, "ID_RENAMING", NULL);
        if (r < 0 && r != -ENOENT)
                return r;

        return r >= 0;
}

bool device_for_action(sd_device *dev, DeviceAction action) {
        DeviceAction a;

        assert(dev);

        if (device_get_action(dev, &a) < 0)
                return false;

        return a == action;
}
Commit	Line	Data
53e1b683	1	/* SPDX-License-Identifier: LGPL-2.1+ */
b237a168	2
152d0efa	3	#include <errno.h>
b237a168	4
152d0efa	5	#include "alloc-util.h"
686d13b9	6	#include "env-file.h"
b237a168	7	#include "log.h"
4b3ca79e	8	#include "parse-util.h"
bc768f04	9	#include "string-table.h"
b237a168 ZJS	10	#include "string-util.h"
	11	#include "udev-util.h"
	12
bc768f04 ZJS	13	static const char* const resolve_name_timing_table[_RESOLVE_NAME_TIMING_MAX] = {
	14	[RESOLVE_NAME_NEVER] = "never",
	15	[RESOLVE_NAME_LATE] = "late",
	16	[RESOLVE_NAME_EARLY] = "early",
	17	};
	18
	19	DEFINE_STRING_TABLE_LOOKUP(resolve_name_timing, ResolveNameTiming);
	20
4b3ca79e ZJS	21	int udev_parse_config_full(
	22	unsigned *ret_children_max,
	23	usec_t *ret_exec_delay_usec,
a14e7af1 ZJS	24	usec_t *ret_event_timeout_usec,
a14e7af1 ZJS	25	ResolveNameTiming *ret_resolve_name_timing) {
4b3ca79e	26
a14e7af1	27	_cleanup_free_ char log_val = NULL, children_max = NULL, exec_delay = NULL, event_timeout = NULL, *resolve_names = NULL;
b237a168 ZJS	28	int r;
b237a168 ZJS	29
aa8fbc74	30	r = parse_env_file(NULL, "/etc/udev/udev.conf",
4b3ca79e ZJS	31	"udev_log", &log_val,
	32	"children_max", &children_max,
	33	"exec_delay", &exec_delay,
9b2934cb YW	34	"event_timeout", &event_timeout,
9b2934cb YW	35	"resolve_names", &resolve_names);
4b3ca79e	36	if (r == -ENOENT)
b237a168 ZJS	37	return 0;
	38	if (r < 0)
	39	return r;
	40
4b3ca79e ZJS	41	if (log_val) {
	42	const char *log;
	43	size_t n;
	44
	45	/* unquote */
	46	n = strlen(log_val);
	47	if (n >= 2 &&
	48	((log_val[0] == '"' && log_val[n-1] == '"') \|\|
	49	(log_val[0] == '\'' && log_val[n-1] == '\''))) {
	50	log_val[n - 1] = '\0';
	51	log = log_val + 1;
	52	} else
	53	log = log_val;
	54
	55	/* we set the udev log level here explicitly, this is supposed
	56	* to regulate the code in libudev/ and udev/. */
	57	r = log_set_max_level_from_string_realm(LOG_REALM_UDEV, log);
	58	if (r < 0)
	59	log_debug_errno(r, "/etc/udev/udev.conf: failed to set udev log level '%s', ignoring: %m", log);
	60	}
	61
	62	if (ret_children_max && children_max) {
	63	r = safe_atou(children_max, ret_children_max);
	64	if (r < 0)
	65	log_notice_errno(r, "/etc/udev/udev.conf: failed to set parse children_max=%s, ignoring: %m", children_max);
	66	}
	67
	68	if (ret_exec_delay_usec && exec_delay) {
	69	r = parse_sec(exec_delay, ret_exec_delay_usec);
	70	if (r < 0)
	71	log_notice_errno(r, "/etc/udev/udev.conf: failed to set parse exec_delay=%s, ignoring: %m", exec_delay);
	72	}
	73
	74	if (ret_event_timeout_usec && event_timeout) {
	75	r = parse_sec(event_timeout, ret_event_timeout_usec);
	76	if (r < 0)
	77	log_notice_errno(r, "/etc/udev/udev.conf: failed to set parse event_timeout=%s, ignoring: %m", event_timeout);
	78	}
b237a168	79
a14e7af1 ZJS	80	if (ret_resolve_name_timing && resolve_names) {
	81	ResolveNameTiming t;
	82
	83	t = resolve_name_timing_from_string(resolve_names);
	84	if (t < 0)
	85	log_notice("/etc/udev/udev.conf: failed to set parse resolve_names=%s, ignoring.", resolve_names);
	86	else
	87	*ret_resolve_name_timing = t;
	88	}
	89
b237a168 ZJS	90	return 0;
b237a168 ZJS	91	}
ed435031 ZJS	92
	93	struct DeviceMonitorData {
	94	const char *sysname;
	95	sd_device *device;
	96	};
	97
	98	static int device_monitor_handler(sd_device_monitor monitor, sd_device device, void *userdata) {
	99	struct DeviceMonitorData *data = userdata;
	100	const char *sysname;
	101
	102	assert(device);
	103	assert(data);
	104	assert(data->sysname);
	105	assert(!data->device);
	106
	107	if (sd_device_get_sysname(device, &sysname) >= 0 && streq(sysname, data->sysname)) {
	108	data->device = sd_device_ref(device);
	109	return sd_event_exit(sd_device_monitor_get_event(monitor), 0);
	110	}
	111
	112	return 0;
	113	}
	114
	115	int device_wait_for_initialization(sd_device device, const char subsystem, sd_device **ret) {
	116	_cleanup_(sd_device_monitor_unrefp) sd_device_monitor *monitor = NULL;
	117	_cleanup_(sd_event_unrefp) sd_event *event = NULL;
	118	struct DeviceMonitorData data = {};
	119	int r;
	120
	121	assert(device);
	122	assert(subsystem);
	123
	124	if (sd_device_get_is_initialized(device) > 0) {
	125	if (ret)
	126	*ret = sd_device_ref(device);
	127	return 0;
	128	}
	129
	130	assert_se(sd_device_get_sysname(device, &data.sysname) >= 0);
	131
	132	/* Wait until the device is initialized, so that we can get access to the ID_PATH property */
	133
fc40bfa7	134	r = sd_event_new(&event);
ed435031 ZJS	135	if (r < 0)
	136	return log_error_errno(r, "Failed to get default event: %m");
	137
	138	r = sd_device_monitor_new(&monitor);
	139	if (r < 0)
	140	return log_error_errno(r, "Failed to acquire monitor: %m");
	141
	142	r = sd_device_monitor_filter_add_match_subsystem_devtype(monitor, subsystem, NULL);
	143	if (r < 0)
	144	return log_error_errno(r, "Failed to add %s subsystem match to monitor: %m", subsystem);
	145
	146	r = sd_device_monitor_attach_event(monitor, event);
	147	if (r < 0)
	148	return log_error_errno(r, "Failed to attach event to device monitor: %m");
	149
	150	r = sd_device_monitor_start(monitor, device_monitor_handler, &data);
	151	if (r < 0)
	152	return log_error_errno(r, "Failed to start device monitor: %m");
	153
	154	/* Check again, maybe things changed. Udev will re-read the db if the device wasn't initialized
	155	* yet. */
	156	if (sd_device_get_is_initialized(device) > 0) {
	157	if (ret)
	158	*ret = sd_device_ref(device);
	159	return 0;
	160	}
	161
	162	r = sd_event_loop(event);
	163	if (r < 0)
	164	return log_error_errno(r, "Event loop failed: %m");
	165
	166	if (ret)
	167	*ret = TAKE_PTR(data.device);
	168	return 0;
	169	}
90ba130f YW	170
	171	int device_is_renaming(sd_device *dev) {
	172	int r;
	173
	174	assert(dev);
	175
	176	r = sd_device_get_property_value(dev, "ID_RENAMING", NULL);
	177	if (r < 0 && r != -ENOENT)
	178	return r;
	179
	180	return r >= 0;
	181	}
a707c65b YW	182
	183	bool device_for_action(sd_device *dev, DeviceAction action) {
	184	DeviceAction a;
	185
	186	assert(dev);
	187
	188	if (device_get_action(dev, &a) < 0)
	189	return false;
	190
	191	return a == action;
	192	}