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

/*
 * 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.hpp>
#include <common/error.hpp>
#include <common/hashtable/hashtable.hpp>
#include <common/hashtable/utils.hpp>
#include <common/tracker.hpp>

#include <stdbool.h>
#include <type_traits>

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)(std::is_signed<as_type>::value ?              \
			(value_ptr)->u._signed : (value_ptr)->u._unsigned))

#define SET_INTEGRAL_COMM_VALUE(comm_value, from_value)                         \
	if (std::is_signed<decltype(from_value)>::value) {                      \
		(comm_value)->u._signed =                                  \
				(typeof((comm_value)->u._signed)) from_value;   \
	} else {                                                           \
		(comm_value)->u._unsigned =                                \
				(typeof((comm_value)->u._unsigned)) from_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;
}

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 = (process_attr_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;
			goto error;
		}
	}

	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 || value_view->size == 0)) {
		ret = LTTNG_ERR_INVALID_PROTOCOL;
		goto error;
	} else if (!is_value_type_name(value_type) && value_view &&
			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;
	free(name);
	return LTTNG_OK;
error:
	free(name);
	process_attr_value_destroy(value);
	return ret;
}

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);
}

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

	if (!values) {
		goto end;
	}

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

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);
}

const struct process_attr_value *lttng_process_attr_tracker_values_get_at_index(
		const struct lttng_process_attr_values *values,
		unsigned int index)
{
	return (process_attr_value *) 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;
}

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;
}

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 (!lttng_buffer_view_is_valid(&header_view)) {
		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 (!lttng_buffer_view_is_valid(&value_view)) {
			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);
			if (!lttng_buffer_view_is_valid(&value_name_view)) {
				goto error;
			}

			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;
}

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

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 = (process_attr_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;
}

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;
}

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();
	}
}

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
7532fa3b MD	13	#include <common/dynamic-array.hpp>
	14	#include <common/error.hpp>
	15	#include <common/hashtable/hashtable.hpp>
	16	#include <common/hashtable/utils.hpp>
	17	#include <common/tracker.hpp>
159b042f JG	18
159b042f JG	19	#include <stdbool.h>
7532fa3b	20	#include <type_traits>
159b042f JG	21
	22	struct process_attr_tracker_values_comm_header {
	23	uint32_t count;
	24	};
	25
	26	struct process_attr_tracker_value_comm {
	27	/* enum lttng_process_attr_value_type */
	28	int32_t type;
	29	union {
	30	struct process_attr_integral_value_comm integral;
	31	/* Includes the '\0' terminator. */
	32	uint32_t name_len;
	33	} value;
	34	};
	35
	36	#define GET_INTEGRAL_COMM_VALUE(value_ptr, as_type) \
7532fa3b MD	37	((as_type)(std::is_signed<as_type>::value ? \
7532fa3b MD	38	(value_ptr)->u._signed : (value_ptr)->u._unsigned))
159b042f	39
7532fa3b MD	40	#define SET_INTEGRAL_COMM_VALUE(comm_value, from_value) \
7532fa3b MD	41	if (std::is_signed<decltype(from_value)>::value) { \
159b042f	42	(comm_value)->u._signed = \
7532fa3b	43	(typeof((comm_value)->u._signed)) from_value; \
159b042f JG	44	} else { \
159b042f JG	45	(comm_value)->u._unsigned = \
7532fa3b	46	(typeof((comm_value)->u._unsigned)) from_value; \
2d97a006 JR	47	}
2d97a006 JR	48
159b042f JG	49	static inline bool is_virtual_process_attr(enum lttng_process_attr process_attr)
	50	{
	51	return process_attr == LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID \|\|
	52	process_attr == LTTNG_PROCESS_ATTR_VIRTUAL_USER_ID \|\|
	53	process_attr == LTTNG_PROCESS_ATTR_VIRTUAL_GROUP_ID;
2d97a006 JR	54	}
2d97a006 JR	55
159b042f JG	56	static inline bool is_value_type_name(
159b042f JG	57	enum lttng_process_attr_value_type value_type)
2d97a006	58	{
159b042f JG	59	return value_type == LTTNG_PROCESS_ATTR_VALUE_TYPE_USER_NAME \|\|
159b042f JG	60	value_type == LTTNG_PROCESS_ATTR_VALUE_TYPE_GROUP_NAME;
2d97a006 JR	61	}
2d97a006 JR	62
159b042f JG	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;
159b042f JG	72	enum lttng_error_code ret = LTTNG_OK;
a6bc4ca9	73	struct process_attr_value value = (process_attr_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;
74675e31	88	goto error;
159b042f JG	89	}
159b042f JG	90	}
2d97a006	91
159b042f JG	92	if (domain != LTTNG_DOMAIN_UST && domain != LTTNG_DOMAIN_KERNEL) {
	93	ERR("Only the user space and kernel space domains may be specified to configure process attribute trackers");
	94	ret = LTTNG_ERR_UNSUPPORTED_DOMAIN;
	95	goto error;
	96	}
2d97a006	97
159b042f JG	98	if (!is_virtual_process_attr(process_attr) &&
	99	domain != LTTNG_DOMAIN_KERNEL) {
	100	ERR("Non-virtual process attributes can only be used in the kernel domain");
	101	ret = LTTNG_ERR_UNSUPPORTED_DOMAIN;
	102	goto error;
	103	}
2d97a006	104
159b042f	105	/* Only expect a payload for name value types. */
b78dab17 JG	106	if (is_value_type_name(value_type) &&
b78dab17 JG	107	(!value_view \|\| value_view->size == 0)) {
159b042f JG	108	ret = LTTNG_ERR_INVALID_PROTOCOL;
159b042f JG	109	goto error;
1ad5cb59 JG	110	} else if (!is_value_type_name(value_type) && value_view &&
1ad5cb59 JG	111	value_view->size != 0) {
159b042f JG	112	ret = LTTNG_ERR_INVALID_PROTOCOL;
159b042f JG	113	goto error;
2d97a006 JR	114	}
2d97a006 JR	115
159b042f JG	116	value->type = value_type;
	117	switch (process_attr) {
	118	case LTTNG_PROCESS_ATTR_PROCESS_ID:
	119	case LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID:
	120	if (value_type != LTTNG_PROCESS_ATTR_VALUE_TYPE_PID) {
	121	ERR("Invalid value type used for process ID process attribute");
	122	ret = LTTNG_ERR_INVALID;
	123	goto error;
	124	}
	125	value->value.pid =
	126	GET_INTEGRAL_COMM_VALUE(integral_value, pid_t);
	127	break;
	128	case LTTNG_PROCESS_ATTR_USER_ID:
	129	case LTTNG_PROCESS_ATTR_VIRTUAL_USER_ID:
	130	switch (value_type) {
	131	case LTTNG_PROCESS_ATTR_VALUE_TYPE_UID:
	132	value->value.uid = GET_INTEGRAL_COMM_VALUE(
	133	integral_value, uid_t);
	134	break;
	135	case LTTNG_PROCESS_ATTR_VALUE_TYPE_USER_NAME:
	136	if (!name) {
	137	ret = LTTNG_ERR_INVALID;
	138	goto error;
	139	}
	140
	141	value->value.user_name = name;
	142	name = NULL;
	143	break;
	144	default:
	145	ERR("Invalid value type used for user ID process attribute");
	146	ret = LTTNG_ERR_INVALID;
	147	goto error;
	148	}
	149	break;
	150	case LTTNG_PROCESS_ATTR_GROUP_ID:
	151	case LTTNG_PROCESS_ATTR_VIRTUAL_GROUP_ID:
	152	switch (value_type) {
	153	case LTTNG_PROCESS_ATTR_VALUE_TYPE_GID:
	154	value->value.gid = GET_INTEGRAL_COMM_VALUE(
	155	integral_value, gid_t);
	156	break;
	157	case LTTNG_PROCESS_ATTR_VALUE_TYPE_GROUP_NAME:
	158	if (!name) {
	159	ret = LTTNG_ERR_INVALID;
	160	goto error;
	161	}
	162
	163	value->value.group_name = name;
	164	name = NULL;
	165	break;
	166	default:
	167	ERR("Invalid value type used for group ID process attribute");
	168	ret = LTTNG_ERR_INVALID;
	169	goto error;
	170	}
	171	break;
	172	default:
	173	ret = LTTNG_ERR_INVALID_PROTOCOL;
	174	goto error;
2d97a006 JR	175	}
2d97a006 JR	176
159b042f JG	177	*_value = value;
159b042f JG	178	value = NULL;
d4e37173	179	free(name);
159b042f JG	180	return LTTNG_OK;
	181	error:
	182	free(name);
	183	process_attr_value_destroy(value);
	184	return ret;
2d97a006 JR	185	}
2d97a006 JR	186
159b042f	187	const char *lttng_process_attr_to_string(enum lttng_process_attr process_attr)
2d97a006	188	{
159b042f JG	189	switch (process_attr) {
	190	case LTTNG_PROCESS_ATTR_PROCESS_ID:
	191	return "process ID";
	192	case LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID:
	193	return "virtual process ID";
	194	case LTTNG_PROCESS_ATTR_USER_ID:
	195	return "user ID";
	196	case LTTNG_PROCESS_ATTR_VIRTUAL_USER_ID:
	197	return "virtual user ID";
	198	case LTTNG_PROCESS_ATTR_GROUP_ID:
	199	return "group ID";
	200	case LTTNG_PROCESS_ATTR_VIRTUAL_GROUP_ID:
	201	return "virtual group ID";
	202	default:
	203	return "unknown process attribute";
2d97a006	204	}
2d97a006 JR	205	}
2d97a006 JR	206
159b042f	207	static void process_attr_tracker_value_destructor(void *ptr)
2d97a006	208	{
159b042f JG	209	struct process_attr_value *value = (typeof(value)) ptr;
	210
	211	process_attr_value_destroy(value);
2d97a006 JR	212	}
2d97a006 JR	213
159b042f	214	struct lttng_process_attr_values *lttng_process_attr_values_create(void)
2d97a006	215	{
a6bc4ca9	216	struct lttng_process_attr_values values = (lttng_process_attr_values ) zmalloc(sizeof(*values));
2d97a006	217
159b042f JG	218	if (!values) {
159b042f JG	219	goto end;
2d97a006 JR	220	}
2d97a006 JR	221
159b042f JG	222	lttng_dynamic_pointer_array_init(
	223	&values->array, process_attr_tracker_value_destructor);
	224	end:
	225	return values;
2d97a006 JR	226	}
2d97a006 JR	227
159b042f JG	228	unsigned int _lttng_process_attr_values_get_count(
159b042f JG	229	const struct lttng_process_attr_values *values)
2d97a006	230	{
159b042f JG	231	return (unsigned int) lttng_dynamic_pointer_array_get_count(
159b042f JG	232	&values->array);
2d97a006 JR	233	}
2d97a006 JR	234
159b042f JG	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	{
a6bc4ca9	239	return (process_attr_value *) lttng_dynamic_pointer_array_get_pointer(&values->array, index);
159b042f	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	int lttng_process_attr_values_serialize(
	294	const struct lttng_process_attr_values *values,
	295	struct lttng_dynamic_buffer *buffer)
a7a533cd JR	296	{
a7a533cd JR	297	int ret;
159b042f JG	298	unsigned int count, i;
159b042f JG	299	struct process_attr_tracker_values_comm_header header = {};
a7a533cd	300
159b042f JG	301	count = _lttng_process_attr_values_get_count(values);
159b042f JG	302	header.count = (uint32_t) count;
a7a533cd	303
159b042f	304	ret = lttng_dynamic_buffer_append(buffer, &header, sizeof(header));
a7a533cd	305	if (ret) {
159b042f	306	goto end;
2d97a006 JR	307	}
2d97a006 JR	308
159b042f JG	309	for (i = 0; i < count; i++) {
	310	const struct process_attr_value *value =
	311	lttng_process_attr_tracker_values_get_at_index(
	312	values, i);
2d97a006	313
159b042f JG	314	ret = process_attr_tracker_value_serialize(value, buffer);
	315	if (ret) {
	316	goto end;
	317	}
2d97a006	318	}
159b042f JG	319	end:
159b042f JG	320	return ret;
2d97a006	321	}
a7a533cd	322
159b042f JG	323	ssize_t lttng_process_attr_values_create_from_buffer(
	324	enum lttng_domain_type domain,
	325	enum lttng_process_attr process_attr,
	326	const struct lttng_buffer_view *buffer_view,
	327	struct lttng_process_attr_values **_values)
a7a533cd	328	{
159b042f JG	329	ssize_t offset;
	330	unsigned int i;
	331	struct lttng_process_attr_values *values;
	332	struct lttng_buffer_view header_view;
	333	const struct process_attr_tracker_values_comm_header *header;
a7a533cd	334
159b042f JG	335	values = lttng_process_attr_values_create();
159b042f JG	336	if (!values) {
a7a533cd JR	337	goto error;
	338	}
	339
159b042f JG	340	header_view = lttng_buffer_view_from_view(
159b042f JG	341	buffer_view, 0, sizeof(*header));
3e6e0df2	342	if (!lttng_buffer_view_is_valid(&header_view)) {
a7a533cd JR	343	goto error;
a7a533cd JR	344	}
3e6e0df2	345
159b042f JG	346	offset = header_view.size;
	347	header = (typeof(header)) header_view.data;
	348
	349	/*
	350	* Check that the number of values is not absurdly large with respect to
	351	* the received buffer's size.
	352	*/
	353	if (buffer_view->size <
	354	header->count * sizeof(struct process_attr_tracker_value_comm)) {
	355	goto error;
	356	}
	357	for (i = 0; i < (unsigned int) header->count; i++) {
	358	int ret;
	359	enum lttng_error_code ret_code;
	360	const struct process_attr_tracker_value_comm *value_comm;
	361	struct process_attr_value *value;
	362	enum lttng_process_attr_value_type type;
	363	struct lttng_buffer_view value_view;
	364	struct lttng_buffer_view value_name_view = {};
	365
	366	value_view = lttng_buffer_view_from_view(
	367	buffer_view, offset, sizeof(*value_comm));
3e6e0df2	368	if (!lttng_buffer_view_is_valid(&value_view)) {
159b042f JG	369	goto error;
159b042f JG	370	}
a7a533cd	371
159b042f JG	372	offset += value_view.size;
	373	value_comm = (typeof(value_comm)) value_view.data;
	374	type = (typeof(type)) value_comm->type;
a7a533cd	375
159b042f JG	376	if (is_value_type_name(type)) {
	377	value_name_view = lttng_buffer_view_from_view(
	378	buffer_view, offset,
	379	value_comm->value.name_len);
3e6e0df2 JG	380	if (!lttng_buffer_view_is_valid(&value_name_view)) {
	381	goto error;
	382	}
	383
159b042f JG	384	offset += value_name_view.size;
159b042f JG	385	}
3e6e0df2	386
159b042f JG	387	ret_code = process_attr_value_from_comm(domain, process_attr,
	388	type, &value_comm->value.integral,
	389	&value_name_view, &value);
	390	if (ret_code != LTTNG_OK) {
	391	goto error;
	392	}
a7a533cd	393
159b042f JG	394	ret = lttng_dynamic_pointer_array_add_pointer(
	395	&values->array, value);
	396	if (ret) {
	397	process_attr_value_destroy(value);
	398	goto error;
	399	}
a7a533cd JR	400	}
a7a533cd JR	401
159b042f JG	402	*_values = values;
	403	return offset;
	404	error:
	405	lttng_process_attr_values_destroy(values);
	406	return -1;
a7a533cd JR	407	}
a7a533cd JR	408
159b042f	409	void lttng_process_attr_values_destroy(struct lttng_process_attr_values *values)
a7a533cd	410	{
159b042f JG	411	if (!values) {
	412	return;
	413	}
	414	lttng_dynamic_pointer_array_reset(&values->array);
	415	free(values);
a7a533cd JR	416	}
a7a533cd JR	417
159b042f JG	418	struct process_attr_value *process_attr_value_copy(
159b042f JG	419	const struct process_attr_value *value)
a7a533cd	420	{
159b042f	421	struct process_attr_value *new_value = NULL;
e283e4a0	422
159b042f	423	if (!value) {
e283e4a0 JR	424	goto end;
	425	}
	426
a6bc4ca9	427	new_value = (process_attr_value ) zmalloc(sizeof(new_value));
159b042f JG	428	if (!new_value) {
	429	goto end;
	430	}
	431	if (is_value_type_name(value->type)) {
	432	const char *src =
	433	value->type == LTTNG_PROCESS_ATTR_VALUE_TYPE_USER_NAME ?
	434	value->value.user_name :
	435	value->value.group_name;
	436	char **dst = value->type == LTTNG_PROCESS_ATTR_VALUE_TYPE_USER_NAME ?
	437	&new_value->value.user_name :
	438	&new_value->value.group_name;
	439
	440	new_value->type = value->type;
	441	*dst = strdup(src);
	442	if (!*dst) {
	443	goto error;
	444	}
	445	} else {
	446	new_value = value;
	447	}
e283e4a0	448	end:
159b042f JG	449	return new_value;
	450	error:
	451	free(new_value);
	452	return NULL;
a7a533cd JR	453	}
a7a533cd JR	454
159b042f	455	unsigned long process_attr_value_hash(const struct process_attr_value *a)
a7a533cd	456	{
159b042f	457	unsigned long hash = hash_key_ulong((void *) a->type, lttng_ht_seed);
9df6c82a	458
159b042f JG	459	switch (a->type) {
	460	case LTTNG_PROCESS_ATTR_VALUE_TYPE_PID:
	461	hash ^= hash_key_ulong((void *) (unsigned long) a->value.pid,
	462	lttng_ht_seed);
	463	break;
	464	case LTTNG_PROCESS_ATTR_VALUE_TYPE_UID:
	465	hash ^= hash_key_ulong((void *) (unsigned long) a->value.uid,
	466	lttng_ht_seed);
	467	break;
	468	case LTTNG_PROCESS_ATTR_VALUE_TYPE_GID:
	469	hash ^= hash_key_ulong((void *) (unsigned long) a->value.gid,
	470	lttng_ht_seed);
	471	break;
	472	case LTTNG_PROCESS_ATTR_VALUE_TYPE_USER_NAME:
	473	hash ^= hash_key_str(a->value.user_name, lttng_ht_seed);
	474	break;
	475	case LTTNG_PROCESS_ATTR_VALUE_TYPE_GROUP_NAME:
	476	hash ^= hash_key_str(a->value.group_name, lttng_ht_seed);
	477	break;
	478	default:
	479	abort();
a7a533cd JR	480	}
a7a533cd JR	481
159b042f	482	return hash;
a7a533cd	483	}
f19f5c96	484
159b042f JG	485	bool process_attr_tracker_value_equal(const struct process_attr_value *a,
159b042f JG	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	void process_attr_value_destroy(struct process_attr_value *value)
	508	{
	509	if (!value) {
	510	return;
f19f5c96	511	}
159b042f JG	512	if (is_value_type_name(value->type)) {
	513	free(value->type == LTTNG_PROCESS_ATTR_VALUE_TYPE_USER_NAME ?
	514	value->value.user_name :
	515	value->value.group_name);
	516	}
	517	free(value);
f19f5c96	518	}