[lttng-tools.git] / src / common / tracker.c

/*
 * Copyright (C) 2019 Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
 * Copyright (C) 2020 Jérémie Galarneau <jeremie.galarneau@efficios.com>
 *
 * SPDX-License-Identifier: LGPL-2.1-only
 *
 */

#include <lttng/domain.h>
#include <lttng/lttng-error.h>
#include <lttng/tracker.h>

#include <common/dynamic-array.h>
#include <common/error.h>
#include <common/hashtable/hashtable.h>
#include <common/hashtable/utils.h>
#include <common/tracker.h>

#include <stdbool.h>

struct process_attr_tracker_values_comm_header {
	uint32_t count;
};

struct process_attr_tracker_value_comm {
	/* enum lttng_process_attr_value_type */
	int32_t type;
	union {
		struct process_attr_integral_value_comm integral;
		/* Includes the '\0' terminator. */
		uint32_t name_len;
	} value;
};

#define GET_INTEGRAL_COMM_VALUE(value_ptr, as_type)              \
	((as_type)(is_signed(as_type) ? (value_ptr)->u._signed : \
					(value_ptr)->u._unsigned))

#define SET_INTEGRAL_COMM_VALUE(comm_value, value)                         \
	if (is_signed(typeof(value))) {                                    \
		(comm_value)->u._signed =                                  \
				(typeof((comm_value)->u._signed)) value;   \
	} else {                                                           \
		(comm_value)->u._unsigned =                                \
				(typeof((comm_value)->u._unsigned)) value; \
	}

static inline bool is_virtual_process_attr(enum lttng_process_attr process_attr)
{
	return process_attr == LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID ||
	       process_attr == LTTNG_PROCESS_ATTR_VIRTUAL_USER_ID ||
	       process_attr == LTTNG_PROCESS_ATTR_VIRTUAL_GROUP_ID;
}

static inline bool is_value_type_name(
		enum lttng_process_attr_value_type value_type)
{
	return value_type == LTTNG_PROCESS_ATTR_VALUE_TYPE_USER_NAME ||
	       value_type == LTTNG_PROCESS_ATTR_VALUE_TYPE_GROUP_NAME;
}

LTTNG_HIDDEN
enum lttng_error_code process_attr_value_from_comm(
		enum lttng_domain_type domain,
		enum lttng_process_attr process_attr,
		enum lttng_process_attr_value_type value_type,
		const struct process_attr_integral_value_comm *integral_value,
		const struct lttng_buffer_view *value_view,
		struct process_attr_value **_value)
{
	char *name = NULL;
	enum lttng_error_code ret = LTTNG_OK;
	struct process_attr_value *value = zmalloc(sizeof(*value));

	if (!value) {
		ret = LTTNG_ERR_NOMEM;
		goto error;
	}

	if (value_view && value_view->size > 0) {
		if (value_view->data[value_view->size - 1] != '\0') {
			ret = LTTNG_ERR_INVALID;
			goto error;
		}
		name = strdup(value_view->data);
		if (!name) {
			ret = LTTNG_ERR_NOMEM;
		}
	}

	if (domain != LTTNG_DOMAIN_UST && domain != LTTNG_DOMAIN_KERNEL) {
		ERR("Only the user space and kernel space domains may be specified to configure process attribute trackers");
		ret = LTTNG_ERR_UNSUPPORTED_DOMAIN;
		goto error;
	}

	if (!is_virtual_process_attr(process_attr) &&
			domain != LTTNG_DOMAIN_KERNEL) {
		ERR("Non-virtual process attributes can only be used in the kernel domain");
		ret = LTTNG_ERR_UNSUPPORTED_DOMAIN;
		goto error;
	}

	/* Only expect a payload for name value types. */
	if (is_value_type_name(value_type) && value_view->size == 0) {
		ret = LTTNG_ERR_INVALID_PROTOCOL;
		goto error;
	} else if (!is_value_type_name(value_type) && value_view->size != 0) {
		ret = LTTNG_ERR_INVALID_PROTOCOL;
		goto error;
	}

	value->type = value_type;
	switch (process_attr) {
	case LTTNG_PROCESS_ATTR_PROCESS_ID:
	case LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID:
		if (value_type != LTTNG_PROCESS_ATTR_VALUE_TYPE_PID) {
			ERR("Invalid value type used for process ID process attribute");
			ret = LTTNG_ERR_INVALID;
			goto error;
		}
		value->value.pid =
				GET_INTEGRAL_COMM_VALUE(integral_value, pid_t);
		break;
	case LTTNG_PROCESS_ATTR_USER_ID:
	case LTTNG_PROCESS_ATTR_VIRTUAL_USER_ID:
		switch (value_type) {
		case LTTNG_PROCESS_ATTR_VALUE_TYPE_UID:
			value->value.uid = GET_INTEGRAL_COMM_VALUE(
					integral_value, uid_t);
			break;
		case LTTNG_PROCESS_ATTR_VALUE_TYPE_USER_NAME:
			if (!name) {
				ret = LTTNG_ERR_INVALID;
				goto error;
			}

			value->value.user_name = name;
			name = NULL;
			break;
		default:
			ERR("Invalid value type used for user ID process attribute");
			ret = LTTNG_ERR_INVALID;
			goto error;
		}
		break;
	case LTTNG_PROCESS_ATTR_GROUP_ID:
	case LTTNG_PROCESS_ATTR_VIRTUAL_GROUP_ID:
		switch (value_type) {
		case LTTNG_PROCESS_ATTR_VALUE_TYPE_GID:
			value->value.gid = GET_INTEGRAL_COMM_VALUE(
					integral_value, gid_t);
			break;
		case LTTNG_PROCESS_ATTR_VALUE_TYPE_GROUP_NAME:
			if (!name) {
				ret = LTTNG_ERR_INVALID;
				goto error;
			}

			value->value.group_name = name;
			name = NULL;
			break;
		default:
			ERR("Invalid value type used for group ID process attribute");
			ret = LTTNG_ERR_INVALID;
			goto error;
		}
		break;
	default:
		ret = LTTNG_ERR_INVALID_PROTOCOL;
		goto error;
	}

	*_value = value;
	value = NULL;
	return LTTNG_OK;
error:
	free(name);
	process_attr_value_destroy(value);
	return ret;
}

LTTNG_HIDDEN
const char *lttng_process_attr_to_string(enum lttng_process_attr process_attr)
{
	switch (process_attr) {
	case LTTNG_PROCESS_ATTR_PROCESS_ID:
		return "process ID";
	case LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID:
		return "virtual process ID";
	case LTTNG_PROCESS_ATTR_USER_ID:
		return "user ID";
	case LTTNG_PROCESS_ATTR_VIRTUAL_USER_ID:
		return "virtual user ID";
	case LTTNG_PROCESS_ATTR_GROUP_ID:
		return "group ID";
	case LTTNG_PROCESS_ATTR_VIRTUAL_GROUP_ID:
		return "virtual group ID";
	default:
		return "unknown process attribute";
	}
}

static void process_attr_tracker_value_destructor(void *ptr)
{
	struct process_attr_value *value = (typeof(value)) ptr;

	process_attr_value_destroy(value);
}

LTTNG_HIDDEN
struct lttng_process_attr_values *lttng_process_attr_values_create(void)
{
	struct lttng_process_attr_values *values = zmalloc(sizeof(*values));

	if (!values) {
		goto end;
	}

	lttng_dynamic_pointer_array_init(
			&values->array, process_attr_tracker_value_destructor);
end:
	return values;
}

LTTNG_HIDDEN
unsigned int _lttng_process_attr_values_get_count(
		const struct lttng_process_attr_values *values)
{
	return (unsigned int) lttng_dynamic_pointer_array_get_count(
			&values->array);
}

LTTNG_HIDDEN
const struct process_attr_value *lttng_process_attr_tracker_values_get_at_index(
		const struct lttng_process_attr_values *values,
		unsigned int index)
{
	return lttng_dynamic_pointer_array_get_pointer(&values->array, index);
}

static
int process_attr_tracker_value_serialize(const struct process_attr_value *value,
		struct lttng_dynamic_buffer *buffer)
{
	int ret;
	struct process_attr_tracker_value_comm value_comm = {
			.type = (int32_t) value->type,
	};
	const char *name = NULL;

	switch (value->type) {
	case LTTNG_PROCESS_ATTR_VALUE_TYPE_PID:
		SET_INTEGRAL_COMM_VALUE(
				&value_comm.value.integral, value->value.pid);
		break;
	case LTTNG_PROCESS_ATTR_VALUE_TYPE_UID:
		SET_INTEGRAL_COMM_VALUE(
				&value_comm.value.integral, value->value.uid);
		break;
	case LTTNG_PROCESS_ATTR_VALUE_TYPE_GID:
		SET_INTEGRAL_COMM_VALUE(
				&value_comm.value.integral, value->value.gid);
		break;
	case LTTNG_PROCESS_ATTR_VALUE_TYPE_USER_NAME:
		name = value->value.user_name;
		break;
	case LTTNG_PROCESS_ATTR_VALUE_TYPE_GROUP_NAME:
		name = value->value.group_name;
		break;
	default:
		abort();
	}

	if (name) {
		value_comm.value.name_len = strlen(name) + 1;
	}

	ret = lttng_dynamic_buffer_append(
			buffer, &value_comm, sizeof(value_comm));
	if (ret) {
		goto end;
	}

	if (name) {
		ret = lttng_dynamic_buffer_append(
				buffer, name, value_comm.value.name_len);
	}
end:
	return ret;
}

LTTNG_HIDDEN
int lttng_process_attr_values_serialize(
		const struct lttng_process_attr_values *values,
		struct lttng_dynamic_buffer *buffer)
{
	int ret;
	unsigned int count, i;
	struct process_attr_tracker_values_comm_header header = {};

	count = _lttng_process_attr_values_get_count(values);
	header.count = (uint32_t) count;

	ret = lttng_dynamic_buffer_append(buffer, &header, sizeof(header));
	if (ret) {
		goto end;
	}

	for (i = 0; i < count; i++) {
		const struct process_attr_value *value =
				lttng_process_attr_tracker_values_get_at_index(
						values, i);

		ret = process_attr_tracker_value_serialize(value, buffer);
		if (ret) {
			goto end;
		}
	}
end:
	return ret;
}

LTTNG_HIDDEN
ssize_t lttng_process_attr_values_create_from_buffer(
		enum lttng_domain_type domain,
		enum lttng_process_attr process_attr,
		const struct lttng_buffer_view *buffer_view,
		struct lttng_process_attr_values **_values)
{
	ssize_t offset;
	unsigned int i;
	struct lttng_process_attr_values *values;
	struct lttng_buffer_view header_view;
	const struct process_attr_tracker_values_comm_header *header;

	values = lttng_process_attr_values_create();
	if (!values) {
		goto error;
	}

	header_view = lttng_buffer_view_from_view(
			buffer_view, 0, sizeof(*header));
	if (!header_view.data) {
		goto error;
	}
	offset = header_view.size;
	header = (typeof(header)) header_view.data;

	/*
	 * Check that the number of values is not absurdly large with respect to
	 * the received buffer's size.
	 */
	if (buffer_view->size <
			header->count * sizeof(struct process_attr_tracker_value_comm)) {
		goto error;
	}
	for (i = 0; i < (unsigned int) header->count; i++) {
		int ret;
		enum lttng_error_code ret_code;
		const struct process_attr_tracker_value_comm *value_comm;
		struct process_attr_value *value;
		enum lttng_process_attr_value_type type;
		struct lttng_buffer_view value_view;
		struct lttng_buffer_view value_name_view = {};

		value_view = lttng_buffer_view_from_view(
				buffer_view, offset, sizeof(*value_comm));
		if (!value_view.data) {
			goto error;
		}

		offset += value_view.size;
		value_comm = (typeof(value_comm)) value_view.data;
		type = (typeof(type)) value_comm->type;

		if (is_value_type_name(type)) {
			value_name_view = lttng_buffer_view_from_view(
					buffer_view, offset,
					value_comm->value.name_len);
			offset += value_name_view.size;
		}
		ret_code = process_attr_value_from_comm(domain, process_attr,
				type, &value_comm->value.integral,
				&value_name_view, &value);
		if (ret_code != LTTNG_OK) {
			goto error;
		}

		ret = lttng_dynamic_pointer_array_add_pointer(
				&values->array, value);
		if (ret) {
			process_attr_value_destroy(value);
			goto error;
		}
	}

	*_values = values;
	return offset;
error:
	lttng_process_attr_values_destroy(values);
	return -1;
}

LTTNG_HIDDEN
void lttng_process_attr_values_destroy(struct lttng_process_attr_values *values)
{
	if (!values) {
		return;
	}
	lttng_dynamic_pointer_array_reset(&values->array);
	free(values);
}

LTTNG_HIDDEN
struct process_attr_value *process_attr_value_copy(
		const struct process_attr_value *value)
{
	struct process_attr_value *new_value = NULL;

	if (!value) {
		goto end;
	}

	new_value = zmalloc(sizeof(*new_value));
	if (!new_value) {
		goto end;
	}
	if (is_value_type_name(value->type)) {
		const char *src =
				value->type == LTTNG_PROCESS_ATTR_VALUE_TYPE_USER_NAME ?
						value->value.user_name :
						value->value.group_name;
		char **dst = value->type == LTTNG_PROCESS_ATTR_VALUE_TYPE_USER_NAME ?
					     &new_value->value.user_name :
					     &new_value->value.group_name;

		new_value->type = value->type;
		*dst = strdup(src);
		if (!*dst) {
			goto error;
		}
	} else {
		*new_value = *value;
	}
end:
	return new_value;
error:
	free(new_value);
	return NULL;
}

LTTNG_HIDDEN
unsigned long process_attr_value_hash(const struct process_attr_value *a)
{
	unsigned long hash = hash_key_ulong((void *) a->type, lttng_ht_seed);

	switch (a->type) {
	case LTTNG_PROCESS_ATTR_VALUE_TYPE_PID:
		hash ^= hash_key_ulong((void *) (unsigned long) a->value.pid,
				lttng_ht_seed);
		break;
	case LTTNG_PROCESS_ATTR_VALUE_TYPE_UID:
		hash ^= hash_key_ulong((void *) (unsigned long) a->value.uid,
				lttng_ht_seed);
		break;
	case LTTNG_PROCESS_ATTR_VALUE_TYPE_GID:
		hash ^= hash_key_ulong((void *) (unsigned long) a->value.gid,
				lttng_ht_seed);
		break;
	case LTTNG_PROCESS_ATTR_VALUE_TYPE_USER_NAME:
		hash ^= hash_key_str(a->value.user_name, lttng_ht_seed);
		break;
	case LTTNG_PROCESS_ATTR_VALUE_TYPE_GROUP_NAME:
		hash ^= hash_key_str(a->value.group_name, lttng_ht_seed);
		break;
	default:
		abort();
	}

	return hash;
}

LTTNG_HIDDEN
bool process_attr_tracker_value_equal(const struct process_attr_value *a,
		const struct process_attr_value *b)
{
	if (a->type != b->type) {
		return false;
	}
	switch (a->type) {
	case LTTNG_PROCESS_ATTR_VALUE_TYPE_PID:
		return a->value.pid == b->value.pid;
	case LTTNG_PROCESS_ATTR_VALUE_TYPE_UID:
		return a->value.uid == b->value.uid;
	case LTTNG_PROCESS_ATTR_VALUE_TYPE_GID:
		return a->value.gid == b->value.gid;
	case LTTNG_PROCESS_ATTR_VALUE_TYPE_USER_NAME:
		return !strcmp(a->value.user_name, b->value.user_name);
	case LTTNG_PROCESS_ATTR_VALUE_TYPE_GROUP_NAME:
		return !strcmp(a->value.group_name, b->value.group_name);
	default:
		abort();
	}
}

LTTNG_HIDDEN
void process_attr_value_destroy(struct process_attr_value *value)
{
	if (!value) {
		return;
	}
	if (is_value_type_name(value->type)) {
		free(value->type == LTTNG_PROCESS_ATTR_VALUE_TYPE_USER_NAME ?
						value->value.user_name :
						value->value.group_name);
	}
	free(value);
}
Commit	Line	Data
2d97a006	1	/*
4942c256	2	* Copyright (C) 2019 Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
159b042f	3	* Copyright (C) 2020 Jérémie Galarneau <jeremie.galarneau@efficios.com>
2d97a006	4	*
ab5be9fa	5	* SPDX-License-Identifier: LGPL-2.1-only
2d97a006	6	*
2d97a006 JR	7	*/
2d97a006 JR	8
159b042f JG	9	#include <lttng/domain.h>
	10	#include <lttng/lttng-error.h>
	11	#include <lttng/tracker.h>
2d97a006	12
159b042f JG	13	#include <common/dynamic-array.h>
	14	#include <common/error.h>
	15	#include <common/hashtable/hashtable.h>
	16	#include <common/hashtable/utils.h>
	17	#include <common/tracker.h>
	18
	19	#include <stdbool.h>
	20
	21	struct process_attr_tracker_values_comm_header {
	22	uint32_t count;
	23	};
	24
	25	struct process_attr_tracker_value_comm {
	26	/* enum lttng_process_attr_value_type */
	27	int32_t type;
	28	union {
	29	struct process_attr_integral_value_comm integral;
	30	/* Includes the '\0' terminator. */
	31	uint32_t name_len;
	32	} value;
	33	};
	34
	35	#define GET_INTEGRAL_COMM_VALUE(value_ptr, as_type) \
	36	((as_type)(is_signed(as_type) ? (value_ptr)->u._signed : \
	37	(value_ptr)->u._unsigned))
	38
	39	#define SET_INTEGRAL_COMM_VALUE(comm_value, value) \
	40	if (is_signed(typeof(value))) { \
	41	(comm_value)->u._signed = \
	42	(typeof((comm_value)->u._signed)) value; \
	43	} else { \
	44	(comm_value)->u._unsigned = \
	45	(typeof((comm_value)->u._unsigned)) value; \
2d97a006 JR	46	}
2d97a006 JR	47
159b042f JG	48	static inline bool is_virtual_process_attr(enum lttng_process_attr process_attr)
	49	{
	50	return process_attr == LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID \|\|
	51	process_attr == LTTNG_PROCESS_ATTR_VIRTUAL_USER_ID \|\|
	52	process_attr == LTTNG_PROCESS_ATTR_VIRTUAL_GROUP_ID;
2d97a006 JR	53	}
2d97a006 JR	54
159b042f JG	55	static inline bool is_value_type_name(
159b042f JG	56	enum lttng_process_attr_value_type value_type)
2d97a006	57	{
159b042f JG	58	return value_type == LTTNG_PROCESS_ATTR_VALUE_TYPE_USER_NAME \|\|
159b042f JG	59	value_type == LTTNG_PROCESS_ATTR_VALUE_TYPE_GROUP_NAME;
2d97a006 JR	60	}
2d97a006 JR	61
159b042f JG	62	LTTNG_HIDDEN
	63	enum lttng_error_code process_attr_value_from_comm(
	64	enum lttng_domain_type domain,
	65	enum lttng_process_attr process_attr,
	66	enum lttng_process_attr_value_type value_type,
	67	const struct process_attr_integral_value_comm *integral_value,
	68	const struct lttng_buffer_view *value_view,
	69	struct process_attr_value **_value)
2d97a006	70	{
159b042f JG	71	char *name = NULL;
	72	enum lttng_error_code ret = LTTNG_OK;
	73	struct process_attr_value value = zmalloc(sizeof(value));
2d97a006	74
159b042f JG	75	if (!value) {
159b042f JG	76	ret = LTTNG_ERR_NOMEM;
2d97a006 JR	77	goto error;
	78	}
	79
159b042f JG	80	if (value_view && value_view->size > 0) {
	81	if (value_view->data[value_view->size - 1] != '\0') {
	82	ret = LTTNG_ERR_INVALID;
	83	goto error;
	84	}
	85	name = strdup(value_view->data);
	86	if (!name) {
	87	ret = LTTNG_ERR_NOMEM;
	88	}
	89	}
2d97a006	90
159b042f JG	91	if (domain != LTTNG_DOMAIN_UST && domain != LTTNG_DOMAIN_KERNEL) {
	92	ERR("Only the user space and kernel space domains may be specified to configure process attribute trackers");
	93	ret = LTTNG_ERR_UNSUPPORTED_DOMAIN;
	94	goto error;
	95	}
2d97a006	96
159b042f JG	97	if (!is_virtual_process_attr(process_attr) &&
	98	domain != LTTNG_DOMAIN_KERNEL) {
	99	ERR("Non-virtual process attributes can only be used in the kernel domain");
	100	ret = LTTNG_ERR_UNSUPPORTED_DOMAIN;
	101	goto error;
	102	}
2d97a006	103
159b042f JG	104	/* Only expect a payload for name value types. */
	105	if (is_value_type_name(value_type) && value_view->size == 0) {
	106	ret = LTTNG_ERR_INVALID_PROTOCOL;
	107	goto error;
	108	} else if (!is_value_type_name(value_type) && value_view->size != 0) {
	109	ret = LTTNG_ERR_INVALID_PROTOCOL;
	110	goto error;
2d97a006 JR	111	}
2d97a006 JR	112
159b042f JG	113	value->type = value_type;
	114	switch (process_attr) {
	115	case LTTNG_PROCESS_ATTR_PROCESS_ID:
	116	case LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID:
	117	if (value_type != LTTNG_PROCESS_ATTR_VALUE_TYPE_PID) {
	118	ERR("Invalid value type used for process ID process attribute");
	119	ret = LTTNG_ERR_INVALID;
	120	goto error;
	121	}
	122	value->value.pid =
	123	GET_INTEGRAL_COMM_VALUE(integral_value, pid_t);
	124	break;
	125	case LTTNG_PROCESS_ATTR_USER_ID:
	126	case LTTNG_PROCESS_ATTR_VIRTUAL_USER_ID:
	127	switch (value_type) {
	128	case LTTNG_PROCESS_ATTR_VALUE_TYPE_UID:
	129	value->value.uid = GET_INTEGRAL_COMM_VALUE(
	130	integral_value, uid_t);
	131	break;
	132	case LTTNG_PROCESS_ATTR_VALUE_TYPE_USER_NAME:
	133	if (!name) {
	134	ret = LTTNG_ERR_INVALID;
	135	goto error;
	136	}
	137
	138	value->value.user_name = name;
	139	name = NULL;
	140	break;
	141	default:
	142	ERR("Invalid value type used for user ID process attribute");
	143	ret = LTTNG_ERR_INVALID;
	144	goto error;
	145	}
	146	break;
	147	case LTTNG_PROCESS_ATTR_GROUP_ID:
	148	case LTTNG_PROCESS_ATTR_VIRTUAL_GROUP_ID:
	149	switch (value_type) {
	150	case LTTNG_PROCESS_ATTR_VALUE_TYPE_GID:
	151	value->value.gid = GET_INTEGRAL_COMM_VALUE(
	152	integral_value, gid_t);
	153	break;
	154	case LTTNG_PROCESS_ATTR_VALUE_TYPE_GROUP_NAME:
	155	if (!name) {
	156	ret = LTTNG_ERR_INVALID;
	157	goto error;
	158	}
	159
	160	value->value.group_name = name;
	161	name = NULL;
	162	break;
	163	default:
	164	ERR("Invalid value type used for group ID process attribute");
	165	ret = LTTNG_ERR_INVALID;
	166	goto error;
	167	}
	168	break;
	169	default:
	170	ret = LTTNG_ERR_INVALID_PROTOCOL;
	171	goto error;
2d97a006 JR	172	}
2d97a006 JR	173
159b042f JG	174	*_value = value;
	175	value = NULL;
	176	return LTTNG_OK;
	177	error:
	178	free(name);
	179	process_attr_value_destroy(value);
	180	return ret;
2d97a006 JR	181	}
2d97a006 JR	182
159b042f JG	183	LTTNG_HIDDEN
159b042f JG	184	const char *lttng_process_attr_to_string(enum lttng_process_attr process_attr)
2d97a006	185	{
159b042f JG	186	switch (process_attr) {
	187	case LTTNG_PROCESS_ATTR_PROCESS_ID:
	188	return "process ID";
	189	case LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID:
	190	return "virtual process ID";
	191	case LTTNG_PROCESS_ATTR_USER_ID:
	192	return "user ID";
	193	case LTTNG_PROCESS_ATTR_VIRTUAL_USER_ID:
	194	return "virtual user ID";
	195	case LTTNG_PROCESS_ATTR_GROUP_ID:
	196	return "group ID";
	197	case LTTNG_PROCESS_ATTR_VIRTUAL_GROUP_ID:
	198	return "virtual group ID";
	199	default:
	200	return "unknown process attribute";
2d97a006	201	}
2d97a006 JR	202	}
2d97a006 JR	203
159b042f	204	static void process_attr_tracker_value_destructor(void *ptr)
2d97a006	205	{
159b042f JG	206	struct process_attr_value *value = (typeof(value)) ptr;
	207
	208	process_attr_value_destroy(value);
2d97a006 JR	209	}
2d97a006 JR	210
159b042f JG	211	LTTNG_HIDDEN
159b042f JG	212	struct lttng_process_attr_values *lttng_process_attr_values_create(void)
2d97a006	213	{
159b042f	214	struct lttng_process_attr_values values = zmalloc(sizeof(values));
2d97a006	215
159b042f JG	216	if (!values) {
159b042f JG	217	goto end;
2d97a006 JR	218	}
2d97a006 JR	219
159b042f JG	220	lttng_dynamic_pointer_array_init(
	221	&values->array, process_attr_tracker_value_destructor);
	222	end:
	223	return values;
2d97a006 JR	224	}
2d97a006 JR	225
159b042f JG	226	LTTNG_HIDDEN
	227	unsigned int _lttng_process_attr_values_get_count(
	228	const struct lttng_process_attr_values *values)
2d97a006	229	{
159b042f JG	230	return (unsigned int) lttng_dynamic_pointer_array_get_count(
159b042f JG	231	&values->array);
2d97a006 JR	232	}
2d97a006 JR	233
159b042f JG	234	LTTNG_HIDDEN
	235	const struct process_attr_value *lttng_process_attr_tracker_values_get_at_index(
	236	const struct lttng_process_attr_values *values,
	237	unsigned int index)
2d97a006	238	{
159b042f JG	239	return lttng_dynamic_pointer_array_get_pointer(&values->array, index);
159b042f JG	240	}
2d97a006	241
159b042f JG	242	static
	243	int process_attr_tracker_value_serialize(const struct process_attr_value *value,
	244	struct lttng_dynamic_buffer *buffer)
	245	{
	246	int ret;
	247	struct process_attr_tracker_value_comm value_comm = {
	248	.type = (int32_t) value->type,
	249	};
	250	const char *name = NULL;
	251
	252	switch (value->type) {
	253	case LTTNG_PROCESS_ATTR_VALUE_TYPE_PID:
	254	SET_INTEGRAL_COMM_VALUE(
	255	&value_comm.value.integral, value->value.pid);
2d97a006	256	break;
159b042f JG	257	case LTTNG_PROCESS_ATTR_VALUE_TYPE_UID:
	258	SET_INTEGRAL_COMM_VALUE(
	259	&value_comm.value.integral, value->value.uid);
2d97a006	260	break;
159b042f JG	261	case LTTNG_PROCESS_ATTR_VALUE_TYPE_GID:
	262	SET_INTEGRAL_COMM_VALUE(
	263	&value_comm.value.integral, value->value.gid);
2d97a006	264	break;
159b042f JG	265	case LTTNG_PROCESS_ATTR_VALUE_TYPE_USER_NAME:
159b042f JG	266	name = value->value.user_name;
2d97a006	267	break;
159b042f JG	268	case LTTNG_PROCESS_ATTR_VALUE_TYPE_GROUP_NAME:
	269	name = value->value.group_name;
	270	break;
	271	default:
	272	abort();
2d97a006 JR	273	}
2d97a006 JR	274
159b042f JG	275	if (name) {
159b042f JG	276	value_comm.value.name_len = strlen(name) + 1;
a7a533cd	277	}
159b042f JG	278
	279	ret = lttng_dynamic_buffer_append(
	280	buffer, &value_comm, sizeof(value_comm));
	281	if (ret) {
	282	goto end;
	283	}
	284
	285	if (name) {
	286	ret = lttng_dynamic_buffer_append(
	287	buffer, name, value_comm.value.name_len);
	288	}
	289	end:
a7a533cd JR	290	return ret;
	291	}
	292
159b042f JG	293	LTTNG_HIDDEN
	294	int lttng_process_attr_values_serialize(
	295	const struct lttng_process_attr_values *values,
	296	struct lttng_dynamic_buffer *buffer)
a7a533cd JR	297	{
a7a533cd JR	298	int ret;
159b042f JG	299	unsigned int count, i;
159b042f JG	300	struct process_attr_tracker_values_comm_header header = {};
a7a533cd	301
159b042f JG	302	count = _lttng_process_attr_values_get_count(values);
159b042f JG	303	header.count = (uint32_t) count;
a7a533cd	304
159b042f	305	ret = lttng_dynamic_buffer_append(buffer, &header, sizeof(header));
a7a533cd	306	if (ret) {
159b042f	307	goto end;
2d97a006 JR	308	}
2d97a006 JR	309
159b042f JG	310	for (i = 0; i < count; i++) {
	311	const struct process_attr_value *value =
	312	lttng_process_attr_tracker_values_get_at_index(
	313	values, i);
2d97a006	314
159b042f JG	315	ret = process_attr_tracker_value_serialize(value, buffer);
	316	if (ret) {
	317	goto end;
	318	}
2d97a006	319	}
159b042f JG	320	end:
159b042f JG	321	return ret;
2d97a006	322	}
a7a533cd	323
159b042f JG	324	LTTNG_HIDDEN
	325	ssize_t lttng_process_attr_values_create_from_buffer(
	326	enum lttng_domain_type domain,
	327	enum lttng_process_attr process_attr,
	328	const struct lttng_buffer_view *buffer_view,
	329	struct lttng_process_attr_values **_values)
a7a533cd	330	{
159b042f JG	331	ssize_t offset;
	332	unsigned int i;
	333	struct lttng_process_attr_values *values;
	334	struct lttng_buffer_view header_view;
	335	const struct process_attr_tracker_values_comm_header *header;
a7a533cd	336
159b042f JG	337	values = lttng_process_attr_values_create();
159b042f JG	338	if (!values) {
a7a533cd JR	339	goto error;
	340	}
	341
159b042f JG	342	header_view = lttng_buffer_view_from_view(
	343	buffer_view, 0, sizeof(*header));
	344	if (!header_view.data) {
a7a533cd JR	345	goto error;
a7a533cd JR	346	}
159b042f JG	347	offset = header_view.size;
	348	header = (typeof(header)) header_view.data;
	349
	350	/*
	351	* Check that the number of values is not absurdly large with respect to
	352	* the received buffer's size.
	353	*/
	354	if (buffer_view->size <
	355	header->count * sizeof(struct process_attr_tracker_value_comm)) {
	356	goto error;
	357	}
	358	for (i = 0; i < (unsigned int) header->count; i++) {
	359	int ret;
	360	enum lttng_error_code ret_code;
	361	const struct process_attr_tracker_value_comm *value_comm;
	362	struct process_attr_value *value;
	363	enum lttng_process_attr_value_type type;
	364	struct lttng_buffer_view value_view;
	365	struct lttng_buffer_view value_name_view = {};
	366
	367	value_view = lttng_buffer_view_from_view(
	368	buffer_view, offset, sizeof(*value_comm));
	369	if (!value_view.data) {
	370	goto error;
	371	}
a7a533cd	372
159b042f JG	373	offset += value_view.size;
	374	value_comm = (typeof(value_comm)) value_view.data;
	375	type = (typeof(type)) value_comm->type;
a7a533cd	376
159b042f JG	377	if (is_value_type_name(type)) {
	378	value_name_view = lttng_buffer_view_from_view(
	379	buffer_view, offset,
	380	value_comm->value.name_len);
	381	offset += value_name_view.size;
	382	}
	383	ret_code = process_attr_value_from_comm(domain, process_attr,
	384	type, &value_comm->value.integral,
	385	&value_name_view, &value);
	386	if (ret_code != LTTNG_OK) {
	387	goto error;
	388	}
a7a533cd	389
159b042f JG	390	ret = lttng_dynamic_pointer_array_add_pointer(
	391	&values->array, value);
	392	if (ret) {
	393	process_attr_value_destroy(value);
	394	goto error;
	395	}
a7a533cd JR	396	}
a7a533cd JR	397
159b042f JG	398	*_values = values;
	399	return offset;
	400	error:
	401	lttng_process_attr_values_destroy(values);
	402	return -1;
a7a533cd JR	403	}
a7a533cd JR	404
159b042f JG	405	LTTNG_HIDDEN
159b042f JG	406	void lttng_process_attr_values_destroy(struct lttng_process_attr_values *values)
a7a533cd	407	{
159b042f JG	408	if (!values) {
	409	return;
	410	}
	411	lttng_dynamic_pointer_array_reset(&values->array);
	412	free(values);
a7a533cd JR	413	}
a7a533cd JR	414
159b042f JG	415	LTTNG_HIDDEN
	416	struct process_attr_value *process_attr_value_copy(
	417	const struct process_attr_value *value)
a7a533cd	418	{
159b042f	419	struct process_attr_value *new_value = NULL;
e283e4a0	420
159b042f	421	if (!value) {
e283e4a0 JR	422	goto end;
	423	}
	424
159b042f JG	425	new_value = zmalloc(sizeof(*new_value));
	426	if (!new_value) {
	427	goto end;
	428	}
	429	if (is_value_type_name(value->type)) {
	430	const char *src =
	431	value->type == LTTNG_PROCESS_ATTR_VALUE_TYPE_USER_NAME ?
	432	value->value.user_name :
	433	value->value.group_name;
	434	char **dst = value->type == LTTNG_PROCESS_ATTR_VALUE_TYPE_USER_NAME ?
	435	&new_value->value.user_name :
	436	&new_value->value.group_name;
	437
	438	new_value->type = value->type;
	439	*dst = strdup(src);
	440	if (!*dst) {
	441	goto error;
	442	}
	443	} else {
	444	new_value = value;
	445	}
e283e4a0	446	end:
159b042f JG	447	return new_value;
	448	error:
	449	free(new_value);
	450	return NULL;
a7a533cd JR	451	}
a7a533cd JR	452
159b042f JG	453	LTTNG_HIDDEN
159b042f JG	454	unsigned long process_attr_value_hash(const struct process_attr_value *a)
a7a533cd	455	{
159b042f	456	unsigned long hash = hash_key_ulong((void *) a->type, lttng_ht_seed);
9df6c82a	457
159b042f JG	458	switch (a->type) {
	459	case LTTNG_PROCESS_ATTR_VALUE_TYPE_PID:
	460	hash ^= hash_key_ulong((void *) (unsigned long) a->value.pid,
	461	lttng_ht_seed);
	462	break;
	463	case LTTNG_PROCESS_ATTR_VALUE_TYPE_UID:
	464	hash ^= hash_key_ulong((void *) (unsigned long) a->value.uid,
	465	lttng_ht_seed);
	466	break;
	467	case LTTNG_PROCESS_ATTR_VALUE_TYPE_GID:
	468	hash ^= hash_key_ulong((void *) (unsigned long) a->value.gid,
	469	lttng_ht_seed);
	470	break;
	471	case LTTNG_PROCESS_ATTR_VALUE_TYPE_USER_NAME:
	472	hash ^= hash_key_str(a->value.user_name, lttng_ht_seed);
	473	break;
	474	case LTTNG_PROCESS_ATTR_VALUE_TYPE_GROUP_NAME:
	475	hash ^= hash_key_str(a->value.group_name, lttng_ht_seed);
	476	break;
	477	default:
	478	abort();
a7a533cd JR	479	}
a7a533cd JR	480
159b042f	481	return hash;
a7a533cd	482	}
f19f5c96	483
159b042f JG	484	LTTNG_HIDDEN
	485	bool process_attr_tracker_value_equal(const struct process_attr_value *a,
	486	const struct process_attr_value *b)
f19f5c96	487	{
159b042f JG	488	if (a->type != b->type) {
159b042f JG	489	return false;
f19f5c96	490	}
159b042f JG	491	switch (a->type) {
	492	case LTTNG_PROCESS_ATTR_VALUE_TYPE_PID:
	493	return a->value.pid == b->value.pid;
	494	case LTTNG_PROCESS_ATTR_VALUE_TYPE_UID:
	495	return a->value.uid == b->value.uid;
	496	case LTTNG_PROCESS_ATTR_VALUE_TYPE_GID:
	497	return a->value.gid == b->value.gid;
	498	case LTTNG_PROCESS_ATTR_VALUE_TYPE_USER_NAME:
	499	return !strcmp(a->value.user_name, b->value.user_name);
	500	case LTTNG_PROCESS_ATTR_VALUE_TYPE_GROUP_NAME:
	501	return !strcmp(a->value.group_name, b->value.group_name);
	502	default:
	503	abort();
	504	}
	505	}
f19f5c96	506
159b042f JG	507	LTTNG_HIDDEN
	508	void process_attr_value_destroy(struct process_attr_value *value)
	509	{
	510	if (!value) {
	511	return;
f19f5c96	512	}
159b042f JG	513	if (is_value_type_name(value->type)) {
	514	free(value->type == LTTNG_PROCESS_ATTR_VALUE_TYPE_USER_NAME ?
	515	value->value.user_name :
	516	value->value.group_name);
	517	}
	518	free(value);
f19f5c96	519	}