[lttng-tools.git] / src / common / event-rule / kprobe.c

/*
 * Copyright (C) 2019 Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
 *
 * SPDX-License-Identifier: LGPL-2.1-only
 *
 */

#include <assert.h>
#include <common/credentials.h>
#include <common/error.h>
#include <common/macros.h>
#include <common/payload.h>
#include <common/payload-view.h>
#include <common/runas.h>
#include <ctype.h>
#include <lttng/constant.h>
#include <lttng/event-rule/event-rule-internal.h>
#include <lttng/event-rule/kprobe-internal.h>
#include <lttng/kernel-probe.h>
#include <lttng/kernel-probe-internal.h>
#include <stdio.h>

#define IS_KPROBE_EVENT_RULE(rule) \
	(lttng_event_rule_get_type(rule) == LTTNG_EVENT_RULE_TYPE_KPROBE)

#if (LTTNG_SYMBOL_NAME_LEN == 256)
#define LTTNG_SYMBOL_NAME_LEN_SCANF_IS_A_BROKEN_API "255"
#endif

static void lttng_event_rule_kprobe_destroy(struct lttng_event_rule *rule)
{
	struct lttng_event_rule_kprobe *kprobe;

	kprobe = container_of(rule, struct lttng_event_rule_kprobe, parent);

	lttng_kernel_probe_location_destroy(kprobe->location);
	free(kprobe->name);
	free(kprobe);
}

static bool lttng_event_rule_kprobe_validate(
		const struct lttng_event_rule *rule)
{
	bool valid = false;
	struct lttng_event_rule_kprobe *kprobe;

	if (!rule) {
		goto end;
	}

	kprobe = container_of(rule, struct lttng_event_rule_kprobe, parent);

	/* Required field. */
	if (!kprobe->name) {
		ERR("Invalid name event rule: a name must be set.");
		goto end;
	}

	/* Required field. */
	if(!kprobe->location) {
		ERR("Invalid name event rule: a location must be set.");
		goto end;
	}

	valid = true;
end:
	return valid;
}

static int lttng_event_rule_kprobe_serialize(
		const struct lttng_event_rule *rule,
		struct lttng_payload *payload)
{
	int ret;
	size_t name_len, header_offset, size_before_location;
	struct lttng_event_rule_kprobe *kprobe;
	struct lttng_event_rule_kprobe_comm kprobe_comm;
	struct lttng_event_rule_kprobe_comm *header;

	if (!rule || !IS_KPROBE_EVENT_RULE(rule)) {
		ret = -1;
		goto end;
	}

	header_offset = payload->buffer.size;

	DBG("Serializing kprobe event rule.");
	kprobe = container_of(rule, struct lttng_event_rule_kprobe, parent);

	name_len = strlen(kprobe->name) + 1;
	kprobe_comm.name_len = name_len;

	ret = lttng_dynamic_buffer_append(
			&payload->buffer, &kprobe_comm, sizeof(kprobe_comm));
	if (ret) {
		goto end;
	}

	ret = lttng_dynamic_buffer_append(&payload->buffer, kprobe->name, name_len);
	if (ret) {
		goto end;
	}

	size_before_location = payload->buffer.size;

	ret = lttng_kernel_probe_location_serialize(kprobe->location, payload);
	if (ret < 0) {
		goto end;
	}

	/* Update the header regarding the probe size. */
	header = (struct lttng_event_rule_kprobe_comm*) (
			(char *) payload->buffer.data + header_offset);
	header->location_len = payload->buffer.size - size_before_location;

	ret = 0;

end:
	return ret;
}

static bool lttng_event_rule_kprobe_is_equal(const struct lttng_event_rule *_a,
		const struct lttng_event_rule *_b)
{
	bool is_equal = false;
	struct lttng_event_rule_kprobe *a, *b;

	a = container_of(_a, struct lttng_event_rule_kprobe, parent);
	b = container_of(_b, struct lttng_event_rule_kprobe, parent);

	/* Quick checks */
	if (!!a->name != !!b->name) {
		goto end;
	}

	/* Long check */
	assert(a->name);
	assert(b->name);
	if (strcmp(a->name, b->name)) {
		goto end;
	}

	is_equal = lttng_kernel_probe_location_is_equal(
			a->location, b->location);
end:
	return is_equal;
}

static enum lttng_error_code lttng_event_rule_kprobe_generate_filter_bytecode(
		struct lttng_event_rule *rule,
		const struct lttng_credentials *creds)
{
	/* Nothing to do. */
	return LTTNG_OK;
}

static const char *lttng_event_rule_kprobe_get_filter(
		const struct lttng_event_rule *rule)
{
	/* Not supported. */
	return NULL;
}

static const struct lttng_filter_bytecode *
lttng_event_rule_kprobe_get_filter_bytecode(const struct lttng_event_rule *rule)
{
	/* Not supported. */
	return NULL;
}

static struct lttng_event_exclusion *
lttng_event_rule_kprobe_generate_exclusions(const struct lttng_event_rule *rule)
{
	/* Not supported. */
	return NULL;
}

struct lttng_event_rule *lttng_event_rule_kprobe_create()
{
	struct lttng_event_rule *rule = NULL;
	struct lttng_event_rule_kprobe *krule;

	krule = zmalloc(sizeof(struct lttng_event_rule_kprobe));
	if (!krule) {
		goto end;
	}

	rule = &krule->parent;
	lttng_event_rule_init(&krule->parent, LTTNG_EVENT_RULE_TYPE_KPROBE);
	krule->parent.validate = lttng_event_rule_kprobe_validate;
	krule->parent.serialize = lttng_event_rule_kprobe_serialize;
	krule->parent.equal = lttng_event_rule_kprobe_is_equal;
	krule->parent.destroy = lttng_event_rule_kprobe_destroy;
	krule->parent.generate_filter_bytecode =
			lttng_event_rule_kprobe_generate_filter_bytecode;
	krule->parent.get_filter = lttng_event_rule_kprobe_get_filter;
	krule->parent.get_filter_bytecode =
			lttng_event_rule_kprobe_get_filter_bytecode;
	krule->parent.generate_exclusions =
			lttng_event_rule_kprobe_generate_exclusions;
end:
	return rule;
}

LTTNG_HIDDEN
ssize_t lttng_event_rule_kprobe_create_from_payload(
		struct lttng_payload_view *view,
		struct lttng_event_rule **_event_rule)
{
	ssize_t ret, offset = 0;
	enum lttng_event_rule_status status;
	const struct lttng_event_rule_kprobe_comm *kprobe_comm;
	const char *name;
	struct lttng_buffer_view current_buffer_view;
	struct lttng_event_rule *rule = NULL;
	struct lttng_event_rule_kprobe *kprobe = NULL;
	struct lttng_kernel_probe_location *location;

	if (!_event_rule) {
		ret = -1;
		goto end;
	}

	current_buffer_view = lttng_buffer_view_from_view(
			&view->buffer, offset, sizeof(*kprobe_comm));
	if (!lttng_buffer_view_is_valid(&current_buffer_view)) {
		ERR("Failed to initialize from malformed event rule kprobe: buffer too short to contain header.");
		ret = -1;
		goto end;
	}

	kprobe_comm = (typeof(kprobe_comm)) current_buffer_view.data;

	rule = lttng_event_rule_kprobe_create();
	if (!rule) {
		ERR("Failed to create event rule kprobe.");
		ret = -1;
		goto end;
	}

	kprobe = container_of(rule, struct lttng_event_rule_kprobe, parent);

	/* Skip to payload */
	offset += current_buffer_view.size;

	{
		/* Map the name. */
		struct lttng_payload_view current_payload_view =
				lttng_payload_view_from_view(view, offset,
						kprobe_comm->name_len);

		if (!lttng_payload_view_is_valid(&current_payload_view)) {
			ret = -1;
			goto end;
		}

		name = current_payload_view.buffer.data;
		if (!lttng_buffer_view_contains_string(
				&current_payload_view.buffer, name,
				kprobe_comm->name_len)) {
			ret = -1;
			goto end;
		}
	}

	/* Skip after the name. */
	offset += kprobe_comm->name_len;

	/* Map the kernel probe location. */
	{
		struct lttng_payload_view current_payload_view =
				lttng_payload_view_from_view(view, offset,
						kprobe_comm->location_len);

		if (!lttng_payload_view_is_valid(&current_payload_view)) {
			ret = -1;
			goto end;
		}

		ret = lttng_kernel_probe_location_create_from_payload(
				&current_payload_view, &location);
		if (ret < 0) {
			ret = -1;
			goto end;
		}
	}

	if (ret != kprobe_comm->location_len) {
		ret = -1;
		goto end;
	}

	kprobe->location = location;

	/* Skip after the location */
	offset += kprobe_comm->location_len;

	status = lttng_event_rule_kprobe_set_name(rule, name);
	if (status != LTTNG_EVENT_RULE_STATUS_OK) {
		ERR("Failed to set event rule kprobe name.");
		ret = -1;
		goto end;
	}

	*_event_rule = rule;
	rule = NULL;
	ret = offset;
end:
	lttng_event_rule_destroy(rule);
	return ret;
}

enum lttng_event_rule_status lttng_event_rule_kprobe_set_location(
		struct lttng_event_rule *rule,
		const struct lttng_kernel_probe_location *location)
{
	struct lttng_kernel_probe_location *location_copy = NULL;
	struct lttng_event_rule_kprobe *kprobe;
	enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK;

	if (!rule || !IS_KPROBE_EVENT_RULE(rule) || !location) {
		status = LTTNG_EVENT_RULE_STATUS_INVALID;
		goto end;
	}

	kprobe = container_of(rule, struct lttng_event_rule_kprobe, parent);
	location_copy = lttng_kernel_probe_location_copy(location);
	if (!location_copy) {
		status = LTTNG_EVENT_RULE_STATUS_ERROR;
		goto end;
	}

	if (kprobe->location) {
		lttng_kernel_probe_location_destroy(kprobe->location);
	}

	kprobe->location = location_copy;
	location_copy = NULL;
end:
	lttng_kernel_probe_location_destroy(location_copy);
	return status;
}

enum lttng_event_rule_status lttng_event_rule_kprobe_get_location(
		const struct lttng_event_rule *rule,
		const struct lttng_kernel_probe_location **location)
{
	enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK;
	struct lttng_event_rule_kprobe *kprobe;

	if (!rule || !IS_KPROBE_EVENT_RULE(rule) || !location) {
		status = LTTNG_EVENT_RULE_STATUS_INVALID;
		goto end;
	}

	kprobe = container_of(rule, struct lttng_event_rule_kprobe, parent);
	*location = kprobe->location;

	if (!*location) {
		status = LTTNG_EVENT_RULE_STATUS_UNSET;
		goto end;
	}

end:
	return status;
}

enum lttng_event_rule_status lttng_event_rule_kprobe_set_name(
		struct lttng_event_rule *rule, const char *name)
{
	char *name_copy = NULL;
	struct lttng_event_rule_kprobe *kprobe;
	enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK;

	if (!rule || !IS_KPROBE_EVENT_RULE(rule) || !name ||
			strlen(name) == 0) {
		status = LTTNG_EVENT_RULE_STATUS_INVALID;
		goto end;
	}

	kprobe = container_of(rule, struct lttng_event_rule_kprobe, parent);
	name_copy = strdup(name);
	if (!name_copy) {
		status = LTTNG_EVENT_RULE_STATUS_ERROR;
		goto end;
	}

	free(kprobe->name);

	kprobe->name = name_copy;
	name_copy = NULL;
end:
	return status;
}

enum lttng_event_rule_status lttng_event_rule_kprobe_get_name(
		const struct lttng_event_rule *rule, const char **name)
{
	struct lttng_event_rule_kprobe *kprobe;
	enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK;

	if (!rule || !IS_KPROBE_EVENT_RULE(rule) || !name) {
		status = LTTNG_EVENT_RULE_STATUS_INVALID;
		goto end;
	}

	kprobe = container_of(rule, struct lttng_event_rule_kprobe, parent);
	if (!kprobe->name) {
		status = LTTNG_EVENT_RULE_STATUS_UNSET;
		goto end;
	}

	*name = kprobe->name;
end:
	return status;
}
Commit	Line	Data
077192fd JR	1	/*
	2	* Copyright (C) 2019 Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
	3	*
	4	* SPDX-License-Identifier: LGPL-2.1-only
	5	*
	6	*/
	7
	8	#include <assert.h>
58daac01	9	#include <common/credentials.h>
077192fd JR	10	#include <common/error.h>
	11	#include <common/macros.h>
	12	#include <common/payload.h>
	13	#include <common/payload-view.h>
	14	#include <common/runas.h>
	15	#include <ctype.h>
	16	#include <lttng/constant.h>
	17	#include <lttng/event-rule/event-rule-internal.h>
	18	#include <lttng/event-rule/kprobe-internal.h>
	19	#include <lttng/kernel-probe.h>
	20	#include <lttng/kernel-probe-internal.h>
	21	#include <stdio.h>
	22
	23	#define IS_KPROBE_EVENT_RULE(rule) \
	24	(lttng_event_rule_get_type(rule) == LTTNG_EVENT_RULE_TYPE_KPROBE)
	25
	26	#if (LTTNG_SYMBOL_NAME_LEN == 256)
	27	#define LTTNG_SYMBOL_NAME_LEN_SCANF_IS_A_BROKEN_API "255"
	28	#endif
	29
	30	static void lttng_event_rule_kprobe_destroy(struct lttng_event_rule *rule)
	31	{
	32	struct lttng_event_rule_kprobe *kprobe;
	33
	34	kprobe = container_of(rule, struct lttng_event_rule_kprobe, parent);
	35
	36	lttng_kernel_probe_location_destroy(kprobe->location);
	37	free(kprobe->name);
	38	free(kprobe);
	39	}
	40
	41	static bool lttng_event_rule_kprobe_validate(
	42	const struct lttng_event_rule *rule)
	43	{
	44	bool valid = false;
	45	struct lttng_event_rule_kprobe *kprobe;
	46
	47	if (!rule) {
	48	goto end;
	49	}
	50
	51	kprobe = container_of(rule, struct lttng_event_rule_kprobe, parent);
	52
	53	/* Required field. */
	54	if (!kprobe->name) {
	55	ERR("Invalid name event rule: a name must be set.");
	56	goto end;
	57	}
	58
	59	/* Required field. */
	60	if(!kprobe->location) {
	61	ERR("Invalid name event rule: a location must be set.");
	62	goto end;
	63	}
	64
	65	valid = true;
	66	end:
	67	return valid;
	68	}
	69
	70	static int lttng_event_rule_kprobe_serialize(
	71	const struct lttng_event_rule *rule,
	72	struct lttng_payload *payload)
	73	{
74	int ret;
75	size_t name_len, header_offset, size_before_location;
76	struct lttng_event_rule_kprobe *kprobe;
77	struct lttng_event_rule_kprobe_comm kprobe_comm;
78	struct lttng_event_rule_kprobe_comm *header;
79
80	if (!rule \|\| !IS_KPROBE_EVENT_RULE(rule)) {
81	ret = -1;
82	goto end;
83	}
84
85	header_offset = payload->buffer.size;
86
87	DBG("Serializing kprobe event rule.");
88	kprobe = container_of(rule, struct lttng_event_rule_kprobe, parent);
89
90	name_len = strlen(kprobe->name) + 1;
91	kprobe_comm.name_len = name_len;
92
93	ret = lttng_dynamic_buffer_append(
94	&payload->buffer, &kprobe_comm, sizeof(kprobe_comm));
95	if (ret) {
96	goto end;
97	}
98
99	ret = lttng_dynamic_buffer_append(&payload->buffer, kprobe->name, name_len);
100	if (ret) {
101	goto end;
102	}
103
104	size_before_location = payload->buffer.size;
105
106	ret = lttng_kernel_probe_location_serialize(kprobe->location, payload);
107	if (ret < 0) {
108	goto end;
109	}
110
111	/* Update the header regarding the probe size. */
112	header = (struct lttng_event_rule_kprobe_comm*) (
113	(char *) payload->buffer.data + header_offset);
114	header->location_len = payload->buffer.size - size_before_location;
115
116	ret = 0;
117
118	end:
119	return ret;
120	}
121
122	static bool lttng_event_rule_kprobe_is_equal(const struct lttng_event_rule *_a,
123	const struct lttng_event_rule *_b)
124	{
125	bool is_equal = false;
126	struct lttng_event_rule_kprobe a, b;
127
128	a = container_of(_a, struct lttng_event_rule_kprobe, parent);
129	b = container_of(_b, struct lttng_event_rule_kprobe, parent);
130
131	/* Quick checks */
132	if (!!a->name != !!b->name) {
133	goto end;
134	}
135
136	/* Long check */
137	assert(a->name);
138	assert(b->name);
139	if (strcmp(a->name, b->name)) {
140	goto end;
141	}
142
143	is_equal = lttng_kernel_probe_location_is_equal(
144	a->location, b->location);
145	end:
146	return is_equal;
147	}
148
149	static enum lttng_error_code lttng_event_rule_kprobe_generate_filter_bytecode(
58daac01 JR	150	struct lttng_event_rule *rule,
58daac01 JR	151	const struct lttng_credentials *creds)
077192fd JR	152	{
	153	/* Nothing to do. */
	154	return LTTNG_OK;
	155	}
	156
	157	static const char *lttng_event_rule_kprobe_get_filter(
	158	const struct lttng_event_rule *rule)
	159	{
	160	/* Not supported. */
	161	return NULL;
	162	}
	163
	164	static const struct lttng_filter_bytecode *
	165	lttng_event_rule_kprobe_get_filter_bytecode(const struct lttng_event_rule *rule)
	166	{
	167	/* Not supported. */
	168	return NULL;
	169	}
	170
	171	static struct lttng_event_exclusion *
	172	lttng_event_rule_kprobe_generate_exclusions(const struct lttng_event_rule *rule)
	173	{
	174	/* Not supported. */
	175	return NULL;
	176	}
	177
	178	struct lttng_event_rule *lttng_event_rule_kprobe_create()
	179	{
	180	struct lttng_event_rule *rule = NULL;
	181	struct lttng_event_rule_kprobe *krule;
	182
	183	krule = zmalloc(sizeof(struct lttng_event_rule_kprobe));
	184	if (!krule) {
	185	goto end;
	186	}
	187
	188	rule = &krule->parent;
	189	lttng_event_rule_init(&krule->parent, LTTNG_EVENT_RULE_TYPE_KPROBE);
	190	krule->parent.validate = lttng_event_rule_kprobe_validate;
	191	krule->parent.serialize = lttng_event_rule_kprobe_serialize;
	192	krule->parent.equal = lttng_event_rule_kprobe_is_equal;
	193	krule->parent.destroy = lttng_event_rule_kprobe_destroy;
	194	krule->parent.generate_filter_bytecode =
	195	lttng_event_rule_kprobe_generate_filter_bytecode;
	196	krule->parent.get_filter = lttng_event_rule_kprobe_get_filter;
	197	krule->parent.get_filter_bytecode =
	198	lttng_event_rule_kprobe_get_filter_bytecode;
	199	krule->parent.generate_exclusions =
	200	lttng_event_rule_kprobe_generate_exclusions;
	201	end:
	202	return rule;
	203	}
	204
	205	LTTNG_HIDDEN
	206	ssize_t lttng_event_rule_kprobe_create_from_payload(
	207	struct lttng_payload_view *view,
	208	struct lttng_event_rule **_event_rule)
	209	{
	210	ssize_t ret, offset = 0;
	211	enum lttng_event_rule_status status;
	212	const struct lttng_event_rule_kprobe_comm *kprobe_comm;
	213	const char *name;
	214	struct lttng_buffer_view current_buffer_view;
	215	struct lttng_event_rule *rule = NULL;
216	struct lttng_event_rule_kprobe *kprobe = NULL;
217	struct lttng_kernel_probe_location *location;
218
219	if (!_event_rule) {
220	ret = -1;
221	goto end;
222	}
223
3e6e0df2 JG	224	current_buffer_view = lttng_buffer_view_from_view(
	225	&view->buffer, offset, sizeof(*kprobe_comm));
	226	if (!lttng_buffer_view_is_valid(&current_buffer_view)) {
077192fd JR	227	ERR("Failed to initialize from malformed event rule kprobe: buffer too short to contain header.");
	228	ret = -1;
	229	goto end;
	230	}
	231
077192fd	232	kprobe_comm = (typeof(kprobe_comm)) current_buffer_view.data;
077192fd JR	233
	234	rule = lttng_event_rule_kprobe_create();
	235	if (!rule) {
	236	ERR("Failed to create event rule kprobe.");
	237	ret = -1;
	238	goto end;
	239	}
	240
	241	kprobe = container_of(rule, struct lttng_event_rule_kprobe, parent);
	242
	243	/* Skip to payload */
	244	offset += current_buffer_view.size;
	245
	246	{
	247	/* Map the name. */
	248	struct lttng_payload_view current_payload_view =
	249	lttng_payload_view_from_view(view, offset,
	250	kprobe_comm->name_len);
	251
3e6e0df2	252	if (!lttng_payload_view_is_valid(&current_payload_view)) {
077192fd JR	253	ret = -1;
	254	goto end;
	255	}
	256
3e6e0df2	257	name = current_payload_view.buffer.data;
077192fd JR	258	if (!lttng_buffer_view_contains_string(
	259	&current_payload_view.buffer, name,
	260	kprobe_comm->name_len)) {
	261	ret = -1;
	262	goto end;
	263	}
	264	}
	265
	266	/* Skip after the name. */
	267	offset += kprobe_comm->name_len;
	268
	269	/* Map the kernel probe location. */
	270	{
	271	struct lttng_payload_view current_payload_view =
	272	lttng_payload_view_from_view(view, offset,
	273	kprobe_comm->location_len);
	274
3e6e0df2 JG	275	if (!lttng_payload_view_is_valid(&current_payload_view)) {
	276	ret = -1;
	277	goto end;
	278	}
	279
077192fd JR	280	ret = lttng_kernel_probe_location_create_from_payload(
	281	&current_payload_view, &location);
	282	if (ret < 0) {
	283	ret = -1;
	284	goto end;
	285	}
	286	}
	287
	288	if (ret != kprobe_comm->location_len) {
	289	ret = -1;
	290	goto end;
	291	}
	292
	293	kprobe->location = location;
	294
	295	/* Skip after the location */
	296	offset += kprobe_comm->location_len;
	297
	298	status = lttng_event_rule_kprobe_set_name(rule, name);
	299	if (status != LTTNG_EVENT_RULE_STATUS_OK) {
	300	ERR("Failed to set event rule kprobe name.");
	301	ret = -1;
	302	goto end;
	303	}
	304
	305	*_event_rule = rule;
	306	rule = NULL;
	307	ret = offset;
	308	end:
	309	lttng_event_rule_destroy(rule);
	310	return ret;
	311	}
	312
	313	enum lttng_event_rule_status lttng_event_rule_kprobe_set_location(
	314	struct lttng_event_rule *rule,
	315	const struct lttng_kernel_probe_location *location)
	316	{
	317	struct lttng_kernel_probe_location *location_copy = NULL;
	318	struct lttng_event_rule_kprobe *kprobe;
	319	enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK;
	320
	321	if (!rule \|\| !IS_KPROBE_EVENT_RULE(rule) \|\| !location) {
	322	status = LTTNG_EVENT_RULE_STATUS_INVALID;
	323	goto end;
	324	}
	325
	326	kprobe = container_of(rule, struct lttng_event_rule_kprobe, parent);
	327	location_copy = lttng_kernel_probe_location_copy(location);
	328	if (!location_copy) {
	329	status = LTTNG_EVENT_RULE_STATUS_ERROR;
	330	goto end;
	331	}
	332
	333	if (kprobe->location) {
	334	lttng_kernel_probe_location_destroy(kprobe->location);
	335	}
	336
	337	kprobe->location = location_copy;
	338	location_copy = NULL;
	339	end:
	340	lttng_kernel_probe_location_destroy(location_copy);
	341	return status;
	342	}
	343
344	enum lttng_event_rule_status lttng_event_rule_kprobe_get_location(
345	const struct lttng_event_rule *rule,
346	const struct lttng_kernel_probe_location **location)
347	{
348	enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK;
349	struct lttng_event_rule_kprobe *kprobe;
350
351	if (!rule \|\| !IS_KPROBE_EVENT_RULE(rule) \|\| !location) {
352	status = LTTNG_EVENT_RULE_STATUS_INVALID;
353	goto end;
354	}
355
356	kprobe = container_of(rule, struct lttng_event_rule_kprobe, parent);
357	*location = kprobe->location;
358
359	if (!*location) {
360	status = LTTNG_EVENT_RULE_STATUS_UNSET;
361	goto end;
362	}
363
364	end:
365	return status;
366	}
367
368	enum lttng_event_rule_status lttng_event_rule_kprobe_set_name(
369	struct lttng_event_rule rule, const char name)
370	{
371	char *name_copy = NULL;
372	struct lttng_event_rule_kprobe *kprobe;
373	enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK;
374
375	if (!rule \|\| !IS_KPROBE_EVENT_RULE(rule) \|\| !name \|\|
376	strlen(name) == 0) {
377	status = LTTNG_EVENT_RULE_STATUS_INVALID;
378	goto end;
379	}
380
381	kprobe = container_of(rule, struct lttng_event_rule_kprobe, parent);
382	name_copy = strdup(name);
383	if (!name_copy) {
384	status = LTTNG_EVENT_RULE_STATUS_ERROR;
385	goto end;
386	}
387
388	free(kprobe->name);
389
390	kprobe->name = name_copy;
391	name_copy = NULL;
392	end:
393	return status;
394	}
395
396	enum lttng_event_rule_status lttng_event_rule_kprobe_get_name(
397	const struct lttng_event_rule rule, const char *name)
398	{
399	struct lttng_event_rule_kprobe *kprobe;
400	enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK;
401
402	if (!rule \|\| !IS_KPROBE_EVENT_RULE(rule) \|\| !name) {
403	status = LTTNG_EVENT_RULE_STATUS_INVALID;
404	goto end;
405	}
406
407	kprobe = container_of(rule, struct lttng_event_rule_kprobe, parent);
408	if (!kprobe->name) {
409	status = LTTNG_EVENT_RULE_STATUS_UNSET;
410	goto end;
411	}
412
413	*name = kprobe->name;
414	end:
415	return status;
416	}