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/*
** Zabbix
** Copyright (C) 2001-2020 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 "log.h"
#include "zbxalgo.h"
#include "../zbxalgo/vectorimpl.h"
#include "zbxvariant.h"
#include "zbxserialize.h"
#include "zbxserver.h"
/******************************************************************************
* *
* Function: zbx_eval_get_functionids *
* *
* Purpose: extract functionids from the parsed expression *
* *
* Parameters: ctx - [IN] the evaluation context *
* functionids - [OUT] the extracted functionids *
* *
******************************************************************************/
void zbx_eval_get_functionids(const zbx_eval_context_t *ctx, zbx_vector_uint64_t *functionids)
{
int i;
for (i = 0; i < ctx->stack.values_num; i++)
{
zbx_eval_token_t *token = &ctx->stack.values[i];
if (ZBX_EVAL_TOKEN_FUNCTIONID == token->type)
{
zbx_uint64_t functionid;
if (SUCCEED == is_uint64_n(ctx->expression + token->loc.l + 1, token->loc.r - token->loc.l - 1,
&functionid))
{
zbx_vector_uint64_append(functionids, functionid);
}
}
}
}
/******************************************************************************
* *
* Function: zbx_eval_expand_user_macros *
* *
* Purpose: expand user macros in parsed expression *
* *
* Parameters: ctx - [IN] the evaluation context *
* hostids - [IN] the linked hostids *
* hostids_num - [IN] the number of linked hostids *
* resolver_cb - [IN] the resolver callback *
* *
******************************************************************************/
void zbx_eval_expand_user_macros(const zbx_eval_context_t *ctx, zbx_uint64_t *hostids, int hostids_num,
zbx_macro_resolve_func_t resolver_cb)
{
int i;
for (i = 0; i < ctx->stack.values_num; i++)
{
zbx_eval_token_t *token = &ctx->stack.values[i];
char *value, *tmp;
const char *ptr;
switch (token->type)
{
case ZBX_EVAL_TOKEN_VAR_USERMACRO:
value = resolver_cb(ctx->expression + token->loc.l, token->loc.r - token->loc.l + 1,
hostids, hostids_num);
break;
case ZBX_EVAL_TOKEN_VAR_STR:
if (NULL == (ptr = strstr(ctx->expression + token->loc.l, "{$")) ||
ptr >= ctx->expression + token->loc.r)
{
continue;
}
tmp = zbx_strloc_unquote_dyn(ctx->expression, &token->loc);
value = resolver_cb(tmp, strlen(tmp), hostids, hostids_num);
zbx_free(tmp);
break;
default:
continue;
}
zbx_variant_set_str(&token->value, value);
}
}
/******************************************************************************
* *
* Function: zbx_eval_set_exception *
* *
* Purpose: set eval context to exception that will be returned when executed *
* *
* Parameters: ctx - [IN] the evaluation context *
* message - [IN] the exception message (the memory is owned by *
* context) *
* *
******************************************************************************/
void zbx_eval_set_exception(zbx_eval_context_t *ctx, char *message)
{
zbx_eval_token_t *token;
memset(ctx, 0, sizeof(zbx_eval_context_t));
zbx_vector_eval_token_create(&ctx->stack);
zbx_vector_eval_token_reserve(&ctx->stack, 2);
token = ctx->stack.values;
memset(token, 0, 2 * sizeof(zbx_eval_token_t));
token->type = ZBX_EVAL_TOKEN_VAR_STR;
zbx_variant_set_str(&token->value, message);
(++token)->type = ZBX_EVAL_TOKEN_EXCEPTION;
}
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