/*
** Zabbix
** Copyright (C) 2001-2016 Zabbix SIA
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 2 of the License, or
** (at your option) any later version.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
**/

#include "common.h"
#include "module.h"
#include "sysinfo.h"
#include "log.h"
#include "cfg.h"
#include "alias.h"

#ifdef WITH_AGENT_METRICS
#	include "agent/agent.h"
#endif

#ifdef WITH_COMMON_METRICS
#	include "common/common.h"
#endif

#ifdef WITH_SIMPLE_METRICS
#	include "simple/simple.h"
#endif

#ifdef WITH_SPECIFIC_METRICS
#	include "specsysinfo.h"
#endif

#ifdef WITH_HOSTNAME_METRIC
extern ZBX_METRIC      parameter_hostname;
#endif

static ZBX_METRIC	*commands = NULL;

/******************************************************************************
 *                                                                            *
 * Function: parse_command_dyn                                                *
 *                                                                            *
 * Purpose: parses item key and splits it into command and parameters         *
 *                                                                            *
 * Return value: ZBX_COMMAND_ERROR - error                                    *
 *               ZBX_COMMAND_WITHOUT_PARAMS - command without parameters      *
 *               ZBX_COMMAND_WITH_PARAMS - command with parameters            *
 *                                                                            *
 ******************************************************************************/
static int	parse_command_dyn(const char *command, char **cmd, char **param)
{
	const char	*pl, *pr;
	size_t		cmd_alloc = 0, param_alloc = 0,
			cmd_offset = 0, param_offset = 0;

	for (pl = command; SUCCEED == is_key_char(*pl); pl++)
		;

	if (pl == command)
		return ZBX_COMMAND_ERROR;

	zbx_strncpy_alloc(cmd, &cmd_alloc, &cmd_offset, command, pl - command);

	if ('\0' == *pl)	/* no parameters specified */
	{
		zbx_strncpy_alloc(param, &param_alloc, &param_offset, "", 0);
		return ZBX_COMMAND_WITHOUT_PARAMS;
	}

	if ('[' != *pl)		/* unsupported character */
		return ZBX_COMMAND_ERROR;

	for (pr = ++pl; '\0' != *pr; pr++)
		;

	if (']' != *--pr)
		return ZBX_COMMAND_ERROR;

	zbx_strncpy_alloc(param, &param_alloc, &param_offset, pl, pr - pl);

	return ZBX_COMMAND_WITH_PARAMS;
}

/******************************************************************************
 *                                                                            *
 * Function: add_metric                                                       *
 *                                                                            *
 * Purpose: registers a new item key into the system                          *
 *                                                                            *
 ******************************************************************************/
int	add_metric(ZBX_METRIC *metric, char *error, size_t max_error_len)
{
	int	i = 0;

	while (NULL != commands[i].key)
	{
		if (0 == strcmp(commands[i].key, metric->key))
		{
			zbx_snprintf(error, max_error_len, "key \"%s\" already exists", metric->key);
			return FAIL;	/* metric already exists */
		}
		i++;
	}

	commands[i].key = zbx_strdup(NULL, metric->key);
	commands[i].flags = metric->flags;
	commands[i].function = metric->function;
	commands[i].test_param = (NULL == metric->test_param ? NULL : zbx_strdup(NULL, metric->test_param));

	commands = zbx_realloc(commands, (i + 2) * sizeof(ZBX_METRIC));
	memset(&commands[i + 1], 0, sizeof(ZBX_METRIC));

	return SUCCEED;
}

int	add_user_parameter(const char *itemkey, char *command, char *error, size_t max_error_len)
{
	int		i;
	char		key[MAX_STRING_LEN], parameters[MAX_STRING_LEN];
	unsigned	flag = CF_USERPARAMETER;
	ZBX_METRIC	metric;

	if (ZBX_COMMAND_ERROR == (i = parse_command(itemkey, key, sizeof(key), parameters, sizeof(parameters))))
	{
		zbx_strlcpy(error, "syntax error", max_error_len);
		return FAIL;
	}
	else if (ZBX_COMMAND_WITH_PARAMS == i)
	{
		if (0 != strcmp(parameters, "*"))	/* must be '*' parameters */
		{
			zbx_strlcpy(error, "syntax error", max_error_len);
			return FAIL;
		}
		flag |= CF_HAVEPARAMS;
	}

	metric.key = key;
	metric.flags = flag;
	metric.function = &EXECUTE_USER_PARAMETER;
	metric.test_param = command;

	return add_metric(&metric, error, max_error_len);
}

void	init_metrics()
{
	int	i;
	char	error[MAX_STRING_LEN];

	commands = zbx_malloc(commands, sizeof(ZBX_METRIC));
	commands[0].key = NULL;

#ifdef WITH_AGENT_METRICS
	for (i = 0; NULL != parameters_agent[i].key; i++)
	{
		if (SUCCEED != add_metric(&parameters_agent[i], error, sizeof(error)))
		{
			zabbix_log(LOG_LEVEL_CRIT, "cannot add item key: %s", error);
			exit(EXIT_FAILURE);
		}
	}
#endif

#ifdef WITH_COMMON_METRICS
	for (i = 0; NULL != parameters_common[i].key; i++)
	{
		if (SUCCEED != add_metric(&parameters_common[i], error, sizeof(error)))
		{
			zabbix_log(LOG_LEVEL_CRIT, "cannot add item key: %s", error);
			exit(EXIT_FAILURE);
		}
	}
#endif

#ifdef WITH_SPECIFIC_METRICS
	for (i = 0; NULL != parameters_specific[i].key; i++)
	{
		if (SUCCEED != add_metric(&parameters_specific[i], error, sizeof(error)))
		{
			zabbix_log(LOG_LEVEL_CRIT, "cannot add item key: %s", error);
			exit(EXIT_FAILURE);
		}
	}
#endif

#ifdef WITH_SIMPLE_METRICS
	for (i = 0; NULL != parameters_simple[i].key; i++)
	{
		if (SUCCEED != add_metric(&parameters_simple[i], error, sizeof(error)))
		{
			zabbix_log(LOG_LEVEL_CRIT, "cannot add item key: %s", error);
			exit(EXIT_FAILURE);
		}
	}
#endif

#ifdef WITH_HOSTNAME_METRIC
	if (SUCCEED != add_metric(&parameter_hostname, error, sizeof(error)))
	{
		zabbix_log(LOG_LEVEL_CRIT, "cannot add item key: %s", error);
		exit(EXIT_FAILURE);
	}
#endif
}

void	free_metrics()
{
	if (NULL != commands)
	{
		int	i;

		for (i = 0; NULL != commands[i].key; i++)
		{
			zbx_free(commands[i].key);
			zbx_free(commands[i].test_param);
		}

		zbx_free(commands);
	}
}

static void	zbx_log_init(zbx_log_t *log)
{
	log->value = NULL;
	log->source = NULL;
	log->lastlogsize = 0;
	log->timestamp = 0;
	log->severity = 0;
	log->logeventid = 0;
	log->mtime = 0;
}

void	init_result(AGENT_RESULT *result)
{
	result->type = 0;

	result->ui64 = 0;
	result->dbl = 0;
	result->str = NULL;
	result->text = NULL;
	result->logs = NULL;
	result->msg = NULL;
}

static void	zbx_log_clean(zbx_log_t *log)
{
	zbx_free(log->source);
	zbx_free(log->value);
}

void	zbx_logs_free(zbx_log_t **logs)
{
	size_t	i;

	for (i = 0; NULL != logs[i]; i++)
	{
		zbx_log_clean(logs[i]);
		zbx_free(logs[i]);
	}
	zbx_free(logs);
}

void	free_result(AGENT_RESULT *result)
{
	UNSET_UI64_RESULT(result);
	UNSET_DBL_RESULT(result);
	UNSET_STR_RESULT(result);
	UNSET_TEXT_RESULT(result);
	UNSET_LOG_RESULT(result);
	UNSET_MSG_RESULT(result);
}

/******************************************************************************
 *                                                                            *
 * Function: init_request                                                     *
 *                                                                            *
 * Purpose: initialize the request structure                                  *
 *                                                                            *
 * Parameters: request - pointer to the structure                             *
 *                                                                            *
 ******************************************************************************/
void	init_request(AGENT_REQUEST *request)
{
	request->key = NULL;
	request->nparam = 0;
	request->params = NULL;
	request->lastlogsize = 0;
	request->mtime = 0;
}

/******************************************************************************
 *                                                                            *
 * Function: free_request_params                                              *
 *                                                                            *
 * Purpose: free memory used by the request parameters                        *
 *                                                                            *
 * Parameters: request - pointer to the request structure                     *
 *                                                                            *
 ******************************************************************************/
static void	free_request_params(AGENT_REQUEST *request)
{
	int	i;

	for (i = 0; i < request->nparam; i++)
		zbx_free(request->params[i]);
	zbx_free(request->params);

	request->nparam = 0;
}

/******************************************************************************
 *                                                                            *
 * Function: free_request                                                     *
 *                                                                            *
 * Purpose: free memory used by the request                                   *
 *                                                                            *
 * Parameters: request - pointer to the request structure                     *
 *                                                                            *
 ******************************************************************************/
void	free_request(AGENT_REQUEST *request)
{
	zbx_free(request->key);
	free_request_params(request);
}

/******************************************************************************
 *                                                                            *
 * Function: add_request_param                                                *
 *                                                                            *
 * Purpose: add a new parameter                                               *
 *                                                                            *
 * Parameters: request - pointer to the request structure                     *
 *                                                                            *
 ******************************************************************************/
static void	add_request_param(AGENT_REQUEST *request, char *pvalue)
{
	request->nparam++;
	request->params = zbx_realloc(request->params, request->nparam * sizeof(char *));
	request->params[request->nparam - 1] = pvalue;
}

/******************************************************************************
 *                                                                            *
 * Function: parse_item_key                                                   *
 *                                                                            *
 * Purpose: parse item command (key) and fill AGENT_REQUEST structure         *
 *                                                                            *
 * Parameters: itemkey - complete item key                                    *
 *                                                                            *
 * Return value: request - structure filled with data from item key           *
 *                                                                            *
 ******************************************************************************/
int	parse_item_key(const char *itemkey, AGENT_REQUEST *request)
{
	int	i, ret = FAIL;
	char	*key = NULL, *params = NULL;

	switch (parse_command_dyn(itemkey, &key, &params))
	{
		case ZBX_COMMAND_WITH_PARAMS:
			if (0 == (request->nparam = num_param(params)))
				goto out;	/* key is badly formatted */
			request->params = zbx_malloc(request->params, request->nparam * sizeof(char *));
			for (i = 0; i < request->nparam; i++)
				request->params[i] = get_param_dyn(params, i + 1);
			break;
		case ZBX_COMMAND_ERROR:
			goto out;	/* key is badly formatted */
	}

	request->key = zbx_strdup(NULL, key);

	ret = SUCCEED;
out:
	zbx_free(params);
	zbx_free(key);

	return ret;
}

/******************************************************************************
 *                                                                            *
 * Function: parse_command                                                    *
 *                                                                            *
 * Purpose: parses item key and splits it into command and parameters         *
 *                                                                            *
 * Return value: ZBX_COMMAND_ERROR - error                                    *
 *               ZBX_COMMAND_WITHOUT_PARAMS - command without parameters      *
 *               ZBX_COMMAND_WITH_PARAMS - command with parameters            *
 *                                                                            *
 ******************************************************************************/
int	parse_command(const char *key, char *cmd, size_t cmd_max_len, char *param, size_t param_max_len)
{
	const char	*pl, *pr;
	size_t		sz;

	for (pl = key; SUCCEED == is_key_char(*pl); pl++)
		;

	if (pl == key)
		return ZBX_COMMAND_ERROR;

	if (NULL != cmd)
	{
		if (cmd_max_len <= (sz = (size_t)(pl - key)))
			return ZBX_COMMAND_ERROR;

		memcpy(cmd, key, sz);
		cmd[sz] = '\0';
	}

	if ('\0' == *pl)	/* no parameters specified */
	{
		if (NULL != param)
			*param = '\0';
		return ZBX_COMMAND_WITHOUT_PARAMS;
	}

	if ('[' != *pl)		/* unsupported character */
		return ZBX_COMMAND_ERROR;

	for (pr = ++pl; '\0' != *pr; pr++)
		;

	if (']' != *--pr)
		return ZBX_COMMAND_ERROR;

	if (NULL != param)
	{
		if (param_max_len <= (sz = (size_t)(pr - pl)))
			return ZBX_COMMAND_ERROR;

		memcpy(param, pl, sz);
		param[sz] = '\0';
	}

	return ZBX_COMMAND_WITH_PARAMS;
}

void	test_parameter(const char *key)
{
#define	ZBX_COL_WIDTH	45

	AGENT_RESULT	result;
	int		n;

	init_result(&result);

	process(key, 0, &result);

	n = printf("%s", key);

	if (0 < n && ZBX_COL_WIDTH > n)
		printf("%-*s", ZBX_COL_WIDTH - n, " ");

	if (ISSET_UI64(&result))
		printf(" [u|" ZBX_FS_UI64 "]", result.ui64);

	if (ISSET_DBL(&result))
		printf(" [d|" ZBX_FS_DBL "]", result.dbl);

	if (ISSET_STR(&result))
		printf(" [s|%s]", result.str);

	if (ISSET_TEXT(&result))
		printf(" [t|%s]", result.text);

	if (ISSET_MSG(&result))
		printf(" [m|%s]", result.msg);

	free_result(&result);

	printf("\n");

	fflush(stdout);
}

void	test_parameters()
{
	int	i;
	char	*key = NULL;
	size_t	key_alloc = 0;

	for (i = 0; NULL != commands[i].key; i++)
	{
		if (0 != strcmp(commands[i].key, "__UserPerfCounter"))
		{
			size_t	key_offset = 0;

			zbx_strcpy_alloc(&key, &key_alloc, &key_offset, commands[i].key);

			if (0 == (commands[i].flags & CF_USERPARAMETER) && NULL != commands[i].test_param)
			{
				zbx_chrcpy_alloc(&key, &key_alloc, &key_offset, '[');
				zbx_strcpy_alloc(&key, &key_alloc, &key_offset, commands[i].test_param);
				zbx_chrcpy_alloc(&key, &key_alloc, &key_offset, ']');
			}

			test_parameter(key);
		}
	}

	zbx_free(key);

	test_aliases();
}

static int	zbx_check_user_parameter(const char *param, char *error, int max_error_len)
{
	const char	suppressed_chars[] = "\\'\"`*?[]{}~$!&;()<>|#@\n", *c;
	char		*buf = NULL;
	size_t		buf_alloc = 128, buf_offset = 0;

	if (0 != CONFIG_UNSAFE_USER_PARAMETERS)
		return SUCCEED;

	for (c = suppressed_chars; '\0' != *c; c++)
	{
		if (NULL == strchr(param, *c))
			continue;

		buf = zbx_malloc(buf, buf_alloc);

		for (c = suppressed_chars; '\0' != *c; c++)
		{
			if (c != suppressed_chars)
				zbx_strcpy_alloc(&buf, &buf_alloc, &buf_offset, ", ");

			if (0 != isprint(*c))
				zbx_chrcpy_alloc(&buf, &buf_alloc, &buf_offset, *c);
			else
				zbx_snprintf_alloc(&buf, &buf_alloc, &buf_offset, "0x%02x", *c);
		}

		zbx_snprintf(error, max_error_len, "special characters \"%s\" are not allowed in the parameters", buf);

		zbx_free(buf);

		return FAIL;
	}

	return SUCCEED;
}

static int	replace_param(const char *cmd, AGENT_REQUEST *request, char **out, char *error, int max_error_len)
{
	const char	*pl = cmd, *pr, *tmp;
	size_t		out_alloc = 0, out_offset = 0;
	int		num, ret = SUCCEED;

	while (NULL != (pr = strchr(pl, '$')))
	{
		zbx_strncpy_alloc(out, &out_alloc, &out_offset, pl, pr - pl);

		pr++;

		if ('0' == *pr)
		{
			zbx_strcpy_alloc(out, &out_alloc, &out_offset, cmd);
		}
		else if ('1' <= *pr && *pr <= '9')
		{
			num = (int)(*pr - '0');

			if (request->nparam >= num)
			{
				tmp = get_rparam(request, num - 1);

				if (SUCCEED != (ret = zbx_check_user_parameter(tmp, error, max_error_len)))
					break;

				zbx_strcpy_alloc(out, &out_alloc, &out_offset, tmp);
			}
		}
		else
		{
			if ('$' != *pr)
				zbx_chrcpy_alloc(out, &out_alloc, &out_offset, '$');
			zbx_chrcpy_alloc(out, &out_alloc, &out_offset, *pr);
		}

		pl = pr + 1;
	}

	if (SUCCEED == ret)
		zbx_strcpy_alloc(out, &out_alloc, &out_offset, pl);

	return ret;
}

int	process(const char *in_command, unsigned flags, AGENT_RESULT *result)
{
	int		ret = NOTSUPPORTED;
	ZBX_METRIC	*command = NULL;
	AGENT_REQUEST	request;

	init_result(result);
	init_request(&request);

	if (SUCCEED != parse_item_key(zbx_alias_get(in_command), &request))
		goto notsupported;

	/* system.run is not allowed by default except for getting hostname for daemons */
	if (1 != CONFIG_ENABLE_REMOTE_COMMANDS && 0 == (flags & PROCESS_LOCAL_COMMAND) &&
			0 == strcmp(request.key, "system.run"))
	{
		goto notsupported;
	}

	for (command = commands; NULL != command->key; command++)
	{
		if (0 == strcmp(command->key, request.key))
			break;
	}

	/* item key not found */
	if (NULL == command->key)
		goto notsupported;

	/* expected item from a module */
	if (0 != (flags & PROCESS_MODULE_COMMAND) && 0 == (command->flags & CF_MODULE))
		goto notsupported;

	/* command does not accept parameters but was called with parameters */
	if (0 == (command->flags & CF_HAVEPARAMS) && 0 != request.nparam)
		goto notsupported;

	if (0 != (command->flags & CF_USERPARAMETER))
	{
		if (0 != (command->flags & CF_HAVEPARAMS))
		{
			char	*parameters = NULL, error[MAX_STRING_LEN];

			if (FAIL == replace_param(command->test_param, &request, &parameters, error, sizeof(error)))
			{
				zabbix_log(LOG_LEVEL_WARNING, "item [%s] error: %s", in_command, error);
				goto notsupported;
			}

			free_request_params(&request);
			add_request_param(&request, parameters);
		}
		else
		{
			free_request_params(&request);
			add_request_param(&request, zbx_strdup(NULL, command->test_param));
		}
	}

	if (SYSINFO_RET_OK != command->function(&request, result))
	{
		/* "return NOTSUPPORTED;" would be more appropriate here for preserving original error */
		/* message in "result" but would break things relying on ZBX_NOTSUPPORTED message. */
		goto notsupported;
	}

	ret = SUCCEED;

notsupported:
	free_request(&request);

	if (NOTSUPPORTED == ret)
	{
		UNSET_MSG_RESULT(result);
		SET_MSG_RESULT(result, zbx_strdup(NULL, ZBX_NOTSUPPORTED));
	}

	return ret;
}

void	set_log_result_empty(AGENT_RESULT *result)
{
	result->logs = zbx_malloc(result->logs, sizeof(zbx_log_t *));

	result->logs[0] = NULL;
	result->type |= AR_LOG;
}

zbx_log_t	*add_log_result(AGENT_RESULT *result, const char *value)
{
	zbx_log_t	*log;
	size_t		i;

	log = zbx_malloc(NULL, sizeof(zbx_log_t));

	zbx_log_init(log);
	log->value = zbx_strdup(log->value, value);

	for (i = 0; NULL != result->logs && NULL != result->logs[i]; i++)
		;

	result->logs = zbx_realloc(result->logs, sizeof(zbx_log_t *) * (i + 2));

	result->logs[i++] = log;
	result->logs[i] = NULL;
	result->type |= AR_LOG;

	return log;
}

int	set_result_type(AGENT_RESULT *result, int value_type, int data_type, char *c)
{
	int		ret = FAIL;
	zbx_uint64_t	value_uint64;
	double		value_double;

	assert(result);

	switch (value_type)
	{
		case ITEM_VALUE_TYPE_UINT64:
			zbx_rtrim(c, " \"");
			zbx_ltrim(c, " \"+");
			del_zeroes(c);

			switch (data_type)
			{
				case ITEM_DATA_TYPE_BOOLEAN:
					if (SUCCEED == is_boolean(c, &value_uint64))
					{
						SET_UI64_RESULT(result, value_uint64);
						ret = SUCCEED;
					}
					break;
				case ITEM_DATA_TYPE_OCTAL:
					if (SUCCEED == is_uoct(c))
					{
						ZBX_OCT2UINT64(value_uint64, c);
						SET_UI64_RESULT(result, value_uint64);
						ret = SUCCEED;
					}
					break;
				case ITEM_DATA_TYPE_DECIMAL:
					if (SUCCEED == is_uint64(c, &value_uint64))
					{
						SET_UI64_RESULT(result, value_uint64);
						ret = SUCCEED;
					}
					break;
				case ITEM_DATA_TYPE_HEXADECIMAL:
					if (SUCCEED == is_uhex(c))
					{
						ZBX_HEX2UINT64(value_uint64, c);
						SET_UI64_RESULT(result, value_uint64);
						ret = SUCCEED;
					}
					else if (SUCCEED == is_hex_string(c))
					{
						zbx_remove_whitespace(c);
						ZBX_HEX2UINT64(value_uint64, c);
						SET_UI64_RESULT(result, value_uint64);
						ret = SUCCEED;
					}
					break;
				default:
					THIS_SHOULD_NEVER_HAPPEN;
					break;
			}
			break;
		case ITEM_VALUE_TYPE_FLOAT:
			zbx_rtrim(c, " \"");
			zbx_ltrim(c, " \"+");

			if (SUCCEED != is_double(c))
				break;
			value_double = atof(c);

			SET_DBL_RESULT(result, value_double);
			ret = SUCCEED;
			break;
		case ITEM_VALUE_TYPE_STR:
			zbx_replace_invalid_utf8(c);
			SET_STR_RESULT(result, zbx_strdup(NULL, c));
			ret = SUCCEED;
			break;
		case ITEM_VALUE_TYPE_TEXT:
			zbx_replace_invalid_utf8(c);
			SET_TEXT_RESULT(result, zbx_strdup(NULL, c));
			ret = SUCCEED;
			break;
		case ITEM_VALUE_TYPE_LOG:
			zbx_replace_invalid_utf8(c);
			add_log_result(result, c);
			ret = SUCCEED;
			break;
	}

	if (SUCCEED != ret)
	{
		char	*error = NULL;

		zbx_remove_chars(c, "\r\n");
		zbx_replace_invalid_utf8(c);

		if (ITEM_VALUE_TYPE_UINT64 == value_type)
			error = zbx_dsprintf(error,
					"Received value [%s] is not suitable for value type [%s] and data type [%s]",
					c, zbx_item_value_type_string(value_type), zbx_item_data_type_string(data_type));
		else
			error = zbx_dsprintf(error,
					"Received value [%s] is not suitable for value type [%s]",
					c, zbx_item_value_type_string(value_type));

		SET_MSG_RESULT(result, error);
	}

	return ret;
}

static zbx_uint64_t	*get_result_ui64_value(AGENT_RESULT *result)
{
	zbx_uint64_t	value;

	assert(result);

	if (ISSET_UI64(result))
	{
		/* nothing to do */
	}
	else if (ISSET_DBL(result))
	{
		SET_UI64_RESULT(result, result->dbl);
	}
	else if (ISSET_STR(result))
	{
		zbx_rtrim(result->str, " \"");
		zbx_ltrim(result->str, " \"+");
		del_zeroes(result->str);

		if (SUCCEED != is_uint64(result->str, &value))
			return NULL;

		SET_UI64_RESULT(result, value);
	}
	else if (ISSET_TEXT(result))
	{
		zbx_rtrim(result->text, " \"");
		zbx_ltrim(result->text, " \"+");
		del_zeroes(result->text);

		if (SUCCEED != is_uint64(result->text, &value))
			return NULL;

		SET_UI64_RESULT(result, value);
	}
	/* skip AR_MESSAGE - it is information field */

	if (ISSET_UI64(result))
		return &result->ui64;

	return NULL;
}

static double	*get_result_dbl_value(AGENT_RESULT *result)
{
	double	value;

	assert(result);

	if (ISSET_DBL(result))
	{
		/* nothing to do */
	}
	else if (ISSET_UI64(result))
	{
		SET_DBL_RESULT(result, result->ui64);
	}
	else if (ISSET_STR(result))
	{
		zbx_rtrim(result->str, " \"");
		zbx_ltrim(result->str, " \"+");

		if (SUCCEED != is_double(result->str))
			return NULL;
		value = atof(result->str);

		SET_DBL_RESULT(result, value);
	}
	else if (ISSET_TEXT(result))
	{
		zbx_rtrim(result->text, " \"");
		zbx_ltrim(result->text, " \"+");

		if (SUCCEED != is_double(result->text))
			return NULL;
		value = atof(result->text);

		SET_DBL_RESULT(result, value);
	}
	/* skip AR_MESSAGE - it is information field */

	if (ISSET_DBL(result))
		return &result->dbl;

	return NULL;
}

static char	**get_result_str_value(AGENT_RESULT *result)
{
	char	*p, tmp;

	assert(result);

	if (ISSET_STR(result))
	{
		/* nothing to do */
	}
	else if (ISSET_TEXT(result))
	{
		/* NOTE: copy only line */
		for (p = result->text; '\0' != *p && '\r' != *p && '\n' != *p; p++);
		tmp = *p; /* remember result->text character */
		*p = '\0'; /* replace to NUL */
		SET_STR_RESULT(result, zbx_strdup(NULL, result->text)); /* copy line */
		*p = tmp; /* restore result->text character */
	}
	else if (ISSET_UI64(result))
	{
		SET_STR_RESULT(result, zbx_dsprintf(NULL, ZBX_FS_UI64, result->ui64));
	}
	else if (ISSET_DBL(result))
	{
		SET_STR_RESULT(result, zbx_dsprintf(NULL, ZBX_FS_DBL, result->dbl));
	}
	/* skip AR_MESSAGE - it is information field */

	if (ISSET_STR(result))
		return &result->str;

	return NULL;
}

static char	**get_result_text_value(AGENT_RESULT *result)
{
	assert(result);

	if (ISSET_TEXT(result))
	{
		/* nothing to do */
	}
	else if (ISSET_STR(result))
	{
		SET_TEXT_RESULT(result, zbx_strdup(NULL, result->str));
	}
	else if (ISSET_UI64(result))
	{
		SET_TEXT_RESULT(result, zbx_dsprintf(NULL, ZBX_FS_UI64, result->ui64));
	}
	else if (ISSET_DBL(result))
	{
		SET_TEXT_RESULT(result, zbx_dsprintf(NULL, ZBX_FS_DBL, result->dbl));
	}
	/* skip AR_MESSAGE - it is information field */

	if (ISSET_TEXT(result))
		return &result->text;

	return NULL;
}

static zbx_log_t	**get_result_log_value(AGENT_RESULT *result)
{
	if (ISSET_LOG(result))
		return result->logs;

	if (ISSET_STR(result) || ISSET_TEXT(result) || ISSET_UI64(result) || ISSET_DBL(result))
	{
		zbx_log_t	*log;
		size_t		i;

		log = zbx_malloc(NULL, sizeof(zbx_log_t));

		zbx_log_init(log);
		if (ISSET_STR(result))
			log->value = zbx_strdup(log->value, result->str);
		else if (ISSET_TEXT(result))
			log->value = zbx_strdup(log->value, result->text);
		else if (ISSET_UI64(result))
			log->value = zbx_dsprintf(log->value, ZBX_FS_UI64, result->ui64);
		else if (ISSET_DBL(result))
			log->value = zbx_dsprintf(log->value, ZBX_FS_DBL, result->dbl);

		for (i = 0; NULL != result->logs && NULL != result->logs[i]; i++)
			;

		result->logs = zbx_realloc(result->logs, sizeof(zbx_log_t *) * (i + 2));

		result->logs[i++] = log;
		result->logs[i] = NULL;
		result->type |= AR_LOG;

		return result->logs;
	}

	return NULL;
}

/******************************************************************************
 *                                                                            *
 * Function: get_result_value_by_type                                         *
 *                                                                            *
 * Purpose: return value of result in special type                            *
 *          if value missing, convert existing value to requested type        *
 *                                                                            *
 * Return value:                                                              *
 *         NULL - if value is missing or can't be converted                   *
 *                                                                            *
 * Author: Eugene Grigorjev                                                   *
 *                                                                            *
 * Comments:  better use definitions                                          *
 *                GET_UI64_RESULT                                             *
 *                GET_DBL_RESULT                                              *
 *                GET_STR_RESULT                                              *
 *                GET_TEXT_RESULT                                             *
 *                GET_LOG_RESULT                                              *
 *                GET_MSG_RESULT                                              *
 *                                                                            *
 *    AR_MESSAGE - skipped in conversion                                      *
 *                                                                            *
 ******************************************************************************/
void	*get_result_value_by_type(AGENT_RESULT *result, int require_type)
{
	assert(result);

	switch (require_type)
	{
		case AR_UINT64:
			return (void *)get_result_ui64_value(result);
		case AR_DOUBLE:
			return (void *)get_result_dbl_value(result);
		case AR_STRING:
			return (void *)get_result_str_value(result);
		case AR_TEXT:
			return (void *)get_result_text_value(result);
		case AR_LOG:
			return (void *)get_result_log_value(result);
		case AR_MESSAGE:
			if (ISSET_MSG(result))
				return (void *)(&result->msg);
			break;
		default:
			break;
	}

	return NULL;
}

/******************************************************************************
 *                                                                            *
 * Function: unquote_key_param                                                *
 *                                                                            *
 * Purpose: unquotes special symbols in item key parameter                    *
 *                                                                            *
 * Parameters: param - [IN/OUT] item key parameter                            *
 *                                                                            *
 * Comments:                                                                  *
 *   "param"     => param                                                     *
 *   "\"param\"" => "param"                                                   *
 *                                                                            *
 ******************************************************************************/
void	unquote_key_param(char *param)
{
	char	*dst;

	if ('"' != *param)
		return;

	for (dst = param++; '\0' != *param; param++)
	{
		if ('\\' == *param && '"' == param[1])
			continue;

		*dst++ = *param;
	}
	*--dst = '\0';
}

/******************************************************************************
 *                                                                            *
 * Function: quote_key_param                                                  *
 *                                                                            *
 * Purpose: quotes special symbols in item key parameter                      *
 *                                                                            *
 * Parameters: param   - [IN/OUT] item key parameter                          *
 *             forced  - [IN] 1 - enclose parameter in " even if it does not  *
 *                                contain any special characters              *
 *                            0 - do nothing if the paramter does not contain *
 *                                any special characters                      *
 *                                                                            *
 * Return value: SUCEED - if parameter doesn't contain special characters and *
 *                        is not forced to be quoted or when parameter is     *
 *                        enclosed in quotes                                  *
 *               FAIL   - if parameter ends with backslash                    *
 *                                                                            *
 ******************************************************************************/
int	quote_key_param(char **param, int forced)
{
	size_t	sz_src, sz_dst;

	if (0 == forced)
	{
		if ('"' != **param && ' ' != **param && NULL == strchr(*param, ',') && NULL == strchr(*param, ']'))
			return SUCCEED;
	}

	sz_src = strlen(*param);

	if ('\\' == (*param)[sz_src - 1])
		return FAIL;

	sz_dst = zbx_get_escape_string_len(*param, "\"") + 3;

	*param = zbx_realloc(*param, sz_dst);

	(*param)[--sz_dst] = '\0';
	(*param)[--sz_dst] = '"';

	while (0 < sz_src)
	{
		(*param)[--sz_dst] = (*param)[--sz_src];
		if ('"' == (*param)[sz_src])
			(*param)[--sz_dst] = '\\';
	}
	(*param)[--sz_dst] = '"';

	return SUCCEED;
}

#ifdef HAVE_KSTAT_H
zbx_uint64_t	get_kstat_numeric_value(const kstat_named_t *kn)
{
	switch (kn->data_type)
	{
		case KSTAT_DATA_INT32:
			return kn->value.i32;
		case KSTAT_DATA_UINT32:
			return kn->value.ui32;
		case KSTAT_DATA_INT64:
			return kn->value.i64;
		case KSTAT_DATA_UINT64:
			return kn->value.ui64;
		default:
			THIS_SHOULD_NEVER_HAPPEN;
			return 0;
	}
}
#endif
