[lttng-tools.git] / src / common / event-rule / kernel-probe.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 <common/hashtable/hashtable.h>
#include <common/hashtable/utils.h>
#include <ctype.h>
#include <lttng/constant.h>
#include <lttng/event-rule/event-rule.h>
#include <lttng/event-rule/event-rule-internal.h>
#include <lttng/event-rule/kernel-probe-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_KERNEL_PROBE)

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

static void lttng_event_rule_kernel_probe_destroy(struct lttng_event_rule *rule)
{
	struct lttng_event_rule_kernel_probe *kprobe;

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

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

static bool lttng_event_rule_kernel_probe_validate(
		const struct lttng_event_rule *rule)
{
	bool valid = false;
	struct lttng_event_rule_kernel_probe *kprobe;

	if (!rule) {
		goto end;
	}

	kprobe = container_of(rule, struct lttng_event_rule_kernel_probe, 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_kernel_probe_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_kernel_probe *kprobe;
	struct lttng_event_rule_kernel_probe_comm kprobe_comm;
	struct lttng_event_rule_kernel_probe_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_kernel_probe, 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_kernel_probe_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_kernel_probe_is_equal(const struct lttng_event_rule *_a,
		const struct lttng_event_rule *_b)
{
	bool is_equal = false;
	struct lttng_event_rule_kernel_probe *a, *b;

	a = container_of(_a, struct lttng_event_rule_kernel_probe, parent);
	b = container_of(_b, struct lttng_event_rule_kernel_probe, 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_kernel_probe_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_kernel_probe_get_filter(
		const struct lttng_event_rule *rule)
{
	/* Not supported. */
	return NULL;
}

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

static enum lttng_event_rule_generate_exclusions_status
lttng_event_rule_kernel_probe_generate_exclusions(const struct lttng_event_rule *rule,
		struct lttng_event_exclusion **exclusions)
{
	/* Not supported. */
	*exclusions = NULL;
	return LTTNG_EVENT_RULE_GENERATE_EXCLUSIONS_STATUS_NONE;
}

static unsigned long
lttng_event_rule_kernel_probe_hash(
		const struct lttng_event_rule *rule)
{
	unsigned long hash;
	struct lttng_event_rule_kernel_probe *krule =
			container_of(rule, typeof(*krule), parent);

	hash = hash_key_ulong((void *) LTTNG_EVENT_RULE_TYPE_KERNEL_PROBE,
			lttng_ht_seed);
	hash ^= hash_key_str(krule->name, lttng_ht_seed);
	hash ^= lttng_kernel_probe_location_hash(krule->location);

	return hash;
}

static
int kernel_probe_set_location(
		struct lttng_event_rule_kernel_probe *kprobe,
		const struct lttng_kernel_probe_location *location)
{
	int ret;
	struct lttng_kernel_probe_location *location_copy = NULL;

	if (!kprobe || !location || kprobe->location) {
		ret = -1;
		goto end;
	}

	location_copy = lttng_kernel_probe_location_copy(location);
	if (!location_copy) {
		ret = -1;
		goto end;
	}

	kprobe->location = location_copy;
	location_copy = NULL;
	ret = 0;
end:
	lttng_kernel_probe_location_destroy(location_copy);
	return ret;
}

struct lttng_event_rule *lttng_event_rule_kernel_probe_create(
		const struct lttng_kernel_probe_location *location)
{
	struct lttng_event_rule *rule = NULL;
	struct lttng_event_rule_kernel_probe *krule;

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

	rule = &krule->parent;
	lttng_event_rule_init(&krule->parent, LTTNG_EVENT_RULE_TYPE_KERNEL_PROBE);
	krule->parent.validate = lttng_event_rule_kernel_probe_validate;
	krule->parent.serialize = lttng_event_rule_kernel_probe_serialize;
	krule->parent.equal = lttng_event_rule_kernel_probe_is_equal;
	krule->parent.destroy = lttng_event_rule_kernel_probe_destroy;
	krule->parent.generate_filter_bytecode =
			lttng_event_rule_kernel_probe_generate_filter_bytecode;
	krule->parent.get_filter = lttng_event_rule_kernel_probe_get_filter;
	krule->parent.get_filter_bytecode =
			lttng_event_rule_kernel_probe_get_filter_bytecode;
	krule->parent.generate_exclusions =
			lttng_event_rule_kernel_probe_generate_exclusions;
	krule->parent.hash = lttng_event_rule_kernel_probe_hash;

	if (kernel_probe_set_location(krule, location)) {
		lttng_event_rule_destroy(rule);
		rule = NULL;
	}

end:
	return rule;
}

LTTNG_HIDDEN
ssize_t lttng_event_rule_kernel_probe_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_kernel_probe_comm *kprobe_comm;
	const char *name;
	struct lttng_buffer_view current_buffer_view;
	struct lttng_event_rule *rule = NULL;
	struct lttng_kernel_probe_location *location = NULL;

	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;

	/* 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;
	}

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

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

	status = lttng_event_rule_kernel_probe_set_event_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_kernel_probe_location_destroy(location);
	lttng_event_rule_destroy(rule);
	return ret;
}

enum lttng_event_rule_status lttng_event_rule_kernel_probe_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_kernel_probe *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_kernel_probe, 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_kernel_probe_set_event_name(
		struct lttng_event_rule *rule, const char *name)
{
	char *name_copy = NULL;
	struct lttng_event_rule_kernel_probe *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_kernel_probe, 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_kernel_probe_get_event_name(
		const struct lttng_event_rule *rule, const char **name)
{
	struct lttng_event_rule_kernel_probe *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_kernel_probe, 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>
959e3c66 JR	15	#include <common/hashtable/hashtable.h>
959e3c66 JR	16	#include <common/hashtable/utils.h>
077192fd JR	17	#include <ctype.h>
077192fd JR	18	#include <lttng/constant.h>
602a6d40	19	#include <lttng/event-rule/event-rule.h>
077192fd	20	#include <lttng/event-rule/event-rule-internal.h>
a3c51653	21	#include <lttng/event-rule/kernel-probe-internal.h>
077192fd JR	22	#include <lttng/kernel-probe.h>
	23	#include <lttng/kernel-probe-internal.h>
	24	#include <stdio.h>
	25
	26	#define IS_KPROBE_EVENT_RULE(rule) \
f2791161	27	(lttng_event_rule_get_type(rule) == LTTNG_EVENT_RULE_TYPE_KERNEL_PROBE)
077192fd JR	28
	29	#if (LTTNG_SYMBOL_NAME_LEN == 256)
	30	#define LTTNG_SYMBOL_NAME_LEN_SCANF_IS_A_BROKEN_API "255"
	31	#endif
	32
f2791161	33	static void lttng_event_rule_kernel_probe_destroy(struct lttng_event_rule *rule)
077192fd	34	{
f2791161	35	struct lttng_event_rule_kernel_probe *kprobe;
077192fd	36
f2791161	37	kprobe = container_of(rule, struct lttng_event_rule_kernel_probe, parent);
077192fd JR	38
	39	lttng_kernel_probe_location_destroy(kprobe->location);
	40	free(kprobe->name);
	41	free(kprobe);
	42	}
	43
f2791161	44	static bool lttng_event_rule_kernel_probe_validate(
077192fd JR	45	const struct lttng_event_rule *rule)
	46	{
	47	bool valid = false;
f2791161	48	struct lttng_event_rule_kernel_probe *kprobe;
077192fd JR	49
	50	if (!rule) {
	51	goto end;
	52	}
	53
f2791161	54	kprobe = container_of(rule, struct lttng_event_rule_kernel_probe, parent);
077192fd JR	55
	56	/* Required field. */
	57	if (!kprobe->name) {
	58	ERR("Invalid name event rule: a name must be set.");
	59	goto end;
	60	}
	61
	62	/* Required field. */
	63	if(!kprobe->location) {
	64	ERR("Invalid name event rule: a location must be set.");
	65	goto end;
	66	}
	67
	68	valid = true;
	69	end:
	70	return valid;
	71	}
	72
f2791161	73	static int lttng_event_rule_kernel_probe_serialize(
077192fd JR	74	const struct lttng_event_rule *rule,
	75	struct lttng_payload *payload)
	76	{
	77	int ret;
	78	size_t name_len, header_offset, size_before_location;
f2791161 JR	79	struct lttng_event_rule_kernel_probe *kprobe;
	80	struct lttng_event_rule_kernel_probe_comm kprobe_comm;
	81	struct lttng_event_rule_kernel_probe_comm *header;
077192fd JR	82
	83	if (!rule \|\| !IS_KPROBE_EVENT_RULE(rule)) {
	84	ret = -1;
	85	goto end;
	86	}
	87
	88	header_offset = payload->buffer.size;
	89
	90	DBG("Serializing kprobe event rule.");
f2791161	91	kprobe = container_of(rule, struct lttng_event_rule_kernel_probe, parent);
077192fd JR	92
	93	name_len = strlen(kprobe->name) + 1;
	94	kprobe_comm.name_len = name_len;
	95
	96	ret = lttng_dynamic_buffer_append(
	97	&payload->buffer, &kprobe_comm, sizeof(kprobe_comm));
	98	if (ret) {
	99	goto end;
	100	}
	101
	102	ret = lttng_dynamic_buffer_append(&payload->buffer, kprobe->name, name_len);
	103	if (ret) {
	104	goto end;
	105	}
	106
	107	size_before_location = payload->buffer.size;
	108
	109	ret = lttng_kernel_probe_location_serialize(kprobe->location, payload);
	110	if (ret < 0) {
	111	goto end;
	112	}
	113
	114	/* Update the header regarding the probe size. */
f2791161	115	header = (struct lttng_event_rule_kernel_probe_comm*) (
077192fd JR	116	(char *) payload->buffer.data + header_offset);
	117	header->location_len = payload->buffer.size - size_before_location;
	118
	119	ret = 0;
	120
	121	end:
	122	return ret;
	123	}
	124
f2791161	125	static bool lttng_event_rule_kernel_probe_is_equal(const struct lttng_event_rule *_a,
077192fd JR	126	const struct lttng_event_rule *_b)
	127	{
	128	bool is_equal = false;
f2791161	129	struct lttng_event_rule_kernel_probe a, b;
077192fd	130
f2791161 JR	131	a = container_of(_a, struct lttng_event_rule_kernel_probe, parent);
f2791161 JR	132	b = container_of(_b, struct lttng_event_rule_kernel_probe, parent);
077192fd JR	133
	134	/* Quick checks */
	135	if (!!a->name != !!b->name) {
	136	goto end;
	137	}
	138
	139	/* Long check */
	140	assert(a->name);
	141	assert(b->name);
	142	if (strcmp(a->name, b->name)) {
	143	goto end;
	144	}
	145
	146	is_equal = lttng_kernel_probe_location_is_equal(
	147	a->location, b->location);
	148	end:
	149	return is_equal;
	150	}
	151
f2791161	152	static enum lttng_error_code lttng_event_rule_kernel_probe_generate_filter_bytecode(
58daac01 JR	153	struct lttng_event_rule *rule,
58daac01 JR	154	const struct lttng_credentials *creds)
077192fd JR	155	{
	156	/* Nothing to do. */
	157	return LTTNG_OK;
	158	}
	159
f2791161	160	static const char *lttng_event_rule_kernel_probe_get_filter(
077192fd JR	161	const struct lttng_event_rule *rule)
	162	{
	163	/* Not supported. */
	164	return NULL;
	165	}
	166
2b00d462	167	static const struct lttng_bytecode *
f2791161	168	lttng_event_rule_kernel_probe_get_filter_bytecode(const struct lttng_event_rule *rule)
077192fd JR	169	{
	170	/* Not supported. */
	171	return NULL;
	172	}
	173
993578ff	174	static enum lttng_event_rule_generate_exclusions_status
f2791161	175	lttng_event_rule_kernel_probe_generate_exclusions(const struct lttng_event_rule *rule,
993578ff	176	struct lttng_event_exclusion **exclusions)
077192fd JR	177	{
077192fd JR	178	/* Not supported. */
993578ff JR	179	*exclusions = NULL;
993578ff JR	180	return LTTNG_EVENT_RULE_GENERATE_EXCLUSIONS_STATUS_NONE;
077192fd JR	181	}
077192fd JR	182
959e3c66	183	static unsigned long
f2791161	184	lttng_event_rule_kernel_probe_hash(
959e3c66 JR	185	const struct lttng_event_rule *rule)
	186	{
	187	unsigned long hash;
f2791161	188	struct lttng_event_rule_kernel_probe *krule =
959e3c66 JR	189	container_of(rule, typeof(*krule), parent);
959e3c66 JR	190
f2791161	191	hash = hash_key_ulong((void *) LTTNG_EVENT_RULE_TYPE_KERNEL_PROBE,
959e3c66 JR	192	lttng_ht_seed);
	193	hash ^= hash_key_str(krule->name, lttng_ht_seed);
	194	hash ^= lttng_kernel_probe_location_hash(krule->location);
	195
	196	return hash;
	197	}
	198
602a6d40 JR	199	static
	200	int kernel_probe_set_location(
	201	struct lttng_event_rule_kernel_probe *kprobe,
	202	const struct lttng_kernel_probe_location *location)
	203	{
	204	int ret;
	205	struct lttng_kernel_probe_location *location_copy = NULL;
	206
	207	if (!kprobe \|\| !location \|\| kprobe->location) {
	208	ret = -1;
	209	goto end;
	210	}
	211
	212	location_copy = lttng_kernel_probe_location_copy(location);
	213	if (!location_copy) {
	214	ret = -1;
	215	goto end;
	216	}
	217
	218	kprobe->location = location_copy;
	219	location_copy = NULL;
	220	ret = 0;
	221	end:
	222	lttng_kernel_probe_location_destroy(location_copy);
	223	return ret;
	224	}
	225
	226	struct lttng_event_rule *lttng_event_rule_kernel_probe_create(
	227	const struct lttng_kernel_probe_location *location)
077192fd JR	228	{
077192fd JR	229	struct lttng_event_rule *rule = NULL;
f2791161	230	struct lttng_event_rule_kernel_probe *krule;
077192fd	231
f2791161	232	krule = zmalloc(sizeof(struct lttng_event_rule_kernel_probe));
077192fd JR	233	if (!krule) {
	234	goto end;
	235	}
	236
	237	rule = &krule->parent;
f2791161 JR	238	lttng_event_rule_init(&krule->parent, LTTNG_EVENT_RULE_TYPE_KERNEL_PROBE);
	239	krule->parent.validate = lttng_event_rule_kernel_probe_validate;
	240	krule->parent.serialize = lttng_event_rule_kernel_probe_serialize;
	241	krule->parent.equal = lttng_event_rule_kernel_probe_is_equal;
	242	krule->parent.destroy = lttng_event_rule_kernel_probe_destroy;
077192fd	243	krule->parent.generate_filter_bytecode =
f2791161 JR	244	lttng_event_rule_kernel_probe_generate_filter_bytecode;
f2791161 JR	245	krule->parent.get_filter = lttng_event_rule_kernel_probe_get_filter;
077192fd	246	krule->parent.get_filter_bytecode =
f2791161	247	lttng_event_rule_kernel_probe_get_filter_bytecode;
077192fd	248	krule->parent.generate_exclusions =
f2791161 JR	249	lttng_event_rule_kernel_probe_generate_exclusions;
f2791161 JR	250	krule->parent.hash = lttng_event_rule_kernel_probe_hash;
602a6d40 JR	251
	252	if (kernel_probe_set_location(krule, location)) {
	253	lttng_event_rule_destroy(rule);
	254	rule = NULL;
	255	}
	256
077192fd JR	257	end:
	258	return rule;
	259	}
	260
	261	LTTNG_HIDDEN
f2791161	262	ssize_t lttng_event_rule_kernel_probe_create_from_payload(
077192fd JR	263	struct lttng_payload_view *view,
	264	struct lttng_event_rule **_event_rule)
	265	{
	266	ssize_t ret, offset = 0;
	267	enum lttng_event_rule_status status;
f2791161	268	const struct lttng_event_rule_kernel_probe_comm *kprobe_comm;
077192fd JR	269	const char *name;
	270	struct lttng_buffer_view current_buffer_view;
	271	struct lttng_event_rule *rule = NULL;
602a6d40	272	struct lttng_kernel_probe_location *location = NULL;
077192fd JR	273
	274	if (!_event_rule) {
	275	ret = -1;
	276	goto end;
	277	}
	278
3e6e0df2 JG	279	current_buffer_view = lttng_buffer_view_from_view(
	280	&view->buffer, offset, sizeof(*kprobe_comm));
	281	if (!lttng_buffer_view_is_valid(&current_buffer_view)) {
077192fd JR	282	ERR("Failed to initialize from malformed event rule kprobe: buffer too short to contain header.");
	283	ret = -1;
	284	goto end;
	285	}
	286
077192fd	287	kprobe_comm = (typeof(kprobe_comm)) current_buffer_view.data;
077192fd	288
077192fd JR	289	/* Skip to payload */
	290	offset += current_buffer_view.size;
	291
	292	{
	293	/* Map the name. */
	294	struct lttng_payload_view current_payload_view =
	295	lttng_payload_view_from_view(view, offset,
	296	kprobe_comm->name_len);
	297
3e6e0df2	298	if (!lttng_payload_view_is_valid(&current_payload_view)) {
077192fd JR	299	ret = -1;
	300	goto end;
	301	}
	302
3e6e0df2	303	name = current_payload_view.buffer.data;
077192fd JR	304	if (!lttng_buffer_view_contains_string(
	305	&current_payload_view.buffer, name,
	306	kprobe_comm->name_len)) {
	307	ret = -1;
	308	goto end;
	309	}
	310	}
	311
	312	/* Skip after the name. */
	313	offset += kprobe_comm->name_len;
	314
	315	/* Map the kernel probe location. */
	316	{
	317	struct lttng_payload_view current_payload_view =
	318	lttng_payload_view_from_view(view, offset,
	319	kprobe_comm->location_len);
	320
3e6e0df2 JG	321	if (!lttng_payload_view_is_valid(&current_payload_view)) {
	322	ret = -1;
	323	goto end;
	324	}
	325
077192fd JR	326	ret = lttng_kernel_probe_location_create_from_payload(
	327	&current_payload_view, &location);
	328	if (ret < 0) {
	329	ret = -1;
	330	goto end;
	331	}
	332	}
	333
	334	if (ret != kprobe_comm->location_len) {
	335	ret = -1;
	336	goto end;
	337	}
	338
077192fd JR	339	/* Skip after the location */
	340	offset += kprobe_comm->location_len;
	341
602a6d40 JR	342	rule = lttng_event_rule_kernel_probe_create(location);
	343	if (!rule) {
	344	ERR("Failed to create event rule kprobe.");
	345	ret = -1;
	346	goto end;
	347	}
	348
d891bb52	349	status = lttng_event_rule_kernel_probe_set_event_name(rule, name);
077192fd JR	350	if (status != LTTNG_EVENT_RULE_STATUS_OK) {
	351	ERR("Failed to set event rule kprobe name.");
	352	ret = -1;
	353	goto end;
	354	}
	355
	356	*_event_rule = rule;
	357	rule = NULL;
	358	ret = offset;
	359	end:
602a6d40	360	lttng_kernel_probe_location_destroy(location);
077192fd JR	361	lttng_event_rule_destroy(rule);
	362	return ret;
	363	}
	364
f2791161	365	enum lttng_event_rule_status lttng_event_rule_kernel_probe_get_location(
077192fd JR	366	const struct lttng_event_rule *rule,
	367	const struct lttng_kernel_probe_location **location)
	368	{
	369	enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK;
f2791161	370	struct lttng_event_rule_kernel_probe *kprobe;
077192fd JR	371
	372	if (!rule \|\| !IS_KPROBE_EVENT_RULE(rule) \|\| !location) {
	373	status = LTTNG_EVENT_RULE_STATUS_INVALID;
	374	goto end;
	375	}
	376
f2791161	377	kprobe = container_of(rule, struct lttng_event_rule_kernel_probe, parent);
077192fd JR	378	*location = kprobe->location;
	379
	380	if (!*location) {
	381	status = LTTNG_EVENT_RULE_STATUS_UNSET;
	382	goto end;
	383	}
	384
	385	end:
	386	return status;
	387	}
	388
d891bb52	389	enum lttng_event_rule_status lttng_event_rule_kernel_probe_set_event_name(
077192fd JR	390	struct lttng_event_rule rule, const char name)
	391	{
	392	char *name_copy = NULL;
f2791161	393	struct lttng_event_rule_kernel_probe *kprobe;
077192fd JR	394	enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK;
	395
	396	if (!rule \|\| !IS_KPROBE_EVENT_RULE(rule) \|\| !name \|\|
	397	strlen(name) == 0) {
	398	status = LTTNG_EVENT_RULE_STATUS_INVALID;
	399	goto end;
	400	}
	401
f2791161	402	kprobe = container_of(rule, struct lttng_event_rule_kernel_probe, parent);
077192fd JR	403	name_copy = strdup(name);
	404	if (!name_copy) {
	405	status = LTTNG_EVENT_RULE_STATUS_ERROR;
	406	goto end;
	407	}
	408
	409	free(kprobe->name);
	410
	411	kprobe->name = name_copy;
	412	name_copy = NULL;
	413	end:
	414	return status;
	415	}
	416
d891bb52	417	enum lttng_event_rule_status lttng_event_rule_kernel_probe_get_event_name(
077192fd JR	418	const struct lttng_event_rule rule, const char *name)
077192fd JR	419	{
f2791161	420	struct lttng_event_rule_kernel_probe *kprobe;
077192fd JR	421	enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK;
	422
	423	if (!rule \|\| !IS_KPROBE_EVENT_RULE(rule) \|\| !name) {
	424	status = LTTNG_EVENT_RULE_STATUS_INVALID;
	425	goto end;
	426	}
	427
f2791161	428	kprobe = container_of(rule, struct lttng_event_rule_kernel_probe, parent);
077192fd JR	429	if (!kprobe->name) {
	430	status = LTTNG_EVENT_RULE_STATUS_UNSET;
	431	goto end;
	432	}
	433
	434	*name = kprobe->name;
	435	end:
	436	return status;
	437	}