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/*
** Zabbix
** Copyright (C) 2001-2021 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 "zbxhttp.h"
/******************************************************************************
* *
* Function: zbx_http_url_encode *
* *
* Purpose: replaces unsafe characters with a '%' followed by two hexadecimal *
* digits (the only allowed exception is a space character that can *
* be replaced with a plus (+) sign or with %20).to url encode *
* *
* Parameters: source - [IN] the value to encode *
* result - [OUT] encoded string *
* *
******************************************************************************/
void zbx_http_url_encode(const char *source, char **result)
{
char *target, *buffer;
const char *hex = "0123456789ABCDEF";
buffer = (char *)zbx_malloc(NULL, strlen(source) * 3 + 1);
target = buffer;
while ('\0' != *source)
{
if (0 == isalnum(*source) && NULL == strchr("-._~", *source))
{
/* Percent-encoding */
*target++ = '%';
*target++ = hex[(unsigned char)*source >> 4];
*target++ = hex[(unsigned char)*source & 15];
}
else
*target++ = *source;
source++;
}
*target = '\0';
zbx_free(*result);
*result = buffer;
}
/******************************************************************************
* *
* Function: zbx_http_url_decode *
* *
* Purpose: replaces URL escape sequences ('+' or '%' followed by two *
* hexadecimal digits) with matching characters. *
* *
* Parameters: source - [IN] the value to decode *
* result - [OUT] decoded string *
* *
* Return value: SUCCEED - the source string was decoded successfully *
* FAIL - source string contains malformed percent-encoding *
* *
******************************************************************************/
int zbx_http_url_decode(const char *source, char **result)
{
const char *url = source;
char *target, *buffer = (char *)zbx_malloc(NULL, strlen(source) + 1);
target = buffer;
while ('\0' != *source)
{
if ('%' == *source)
{
/* Percent-decoding */
if (FAIL == is_hex_n_range(source + 1, 2, target, sizeof(char), 0, 0xff))
{
zabbix_log(LOG_LEVEL_WARNING, "cannot perform URL decode of '%s' part of string '%s'",
source, url);
zbx_free(buffer);
break;
}
else
source += 2;
}
else if ('+' == *source)
*target = ' ';
else
*target = *source;
target++;
source++;
}
if (NULL != buffer)
{
*target = '\0';
zbx_free(*result);
*result = buffer;
return SUCCEED;
}
return FAIL;
}
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