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