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/*
** Zabbix
** Copyright (C) 2001-2014 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 "zbxregexp.h"
#if defined(_WINDOWS)
# include "gnuregex.h"
#endif
static char *zbx_regexp(const char *string, const char *pattern, int *len, int flags)
{
char *c = NULL;
static char *old_pattern = NULL;
static int old_flags;
static regex_t re;
regmatch_t match;
if (NULL != len)
*len = 0;
if (NULL == string)
goto out;
/* performance optimization: if possible then reuse the last compiled regexp */
if (NULL == old_pattern)
goto compile;
if (0 != strcmp(old_pattern, pattern) || old_flags != flags)
regfree(&re);
else
goto execute;
compile:
if (0 == regcomp(&re, pattern, flags))
{
old_pattern = zbx_strdup(old_pattern, pattern);
old_flags = flags;
}
else
{
zbx_free(old_pattern);
goto out;
}
execute:
if (0 == regexec(&re, string, (size_t)1, &match, 0)) /* matched */
{
c = (char *)string + match.rm_so;
if (NULL != len)
*len = match.rm_eo - match.rm_so;
}
out:
return c;
}
char *zbx_regexp_match(const char *string, const char *pattern, int *len)
{
return zbx_regexp(string, pattern, len, REG_EXTENDED | REG_NEWLINE);
}
char *zbx_iregexp_match(const char *string, const char *pattern, int *len)
{
return zbx_regexp(string, pattern, len, REG_EXTENDED | REG_ICASE | REG_NEWLINE);
}
/*********************************************************************************
* *
* Function: regexp_sub_replace *
* *
* Purpose: Constructs a string from the specified template and regexp match. *
* *
* Parameters: text - [IN] the input string. *
* output_template - [IN] the output string template. The output *
* string is constructed from template by *
* replacing \<n> sequences with the captured *
* regexp group. *
* If the output template is NULL or contains *
* empty string then a copy of the whole *
* input string is returned. *
* match - [IN] the captured group data *
* nmatch - [IN] the number of items in captured group data *
* *
* Return value: Allocated string containing output value *
* *
*********************************************************************************/
static char *regexp_sub_replace(const char *text, const char *output_template, regmatch_t *match, size_t nmatch)
{
char *ptr = NULL;
const char *pstart = output_template, *pgroup;
size_t size = 0, offset = 0, group_index;
if (NULL == output_template || '\0' == *output_template)
return zbx_strdup(NULL, text);
while (NULL != (pgroup = strchr(pstart, '\\')))
{
switch (*(++pgroup))
{
case '\\':
zbx_strncpy_alloc(&ptr, &size, &offset, pstart, pgroup - pstart);
pstart = pgroup + 1;
continue;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
zbx_strncpy_alloc(&ptr, &size, &offset, pstart, pgroup - pstart - 1);
group_index = *pgroup - '0';
if (group_index < nmatch && -1 != match[group_index].rm_so)
{
zbx_strncpy_alloc(&ptr, &size, &offset, text + match[group_index].rm_so,
match[group_index].rm_eo - match[group_index].rm_so);
}
pstart = pgroup + 1;
continue;
case '@':
/* artificial construct to replace the first captured group or fail */
/* if the regular expression pattern contains no groups */
if (-1 == match[1].rm_so)
{
zbx_free(ptr);
goto out;
}
zbx_strncpy_alloc(&ptr, &size, &offset, text + match[1].rm_so,
match[1].rm_eo - match[1].rm_so);
pstart = pgroup + 1;
continue;
default:
zbx_strncpy_alloc(&ptr, &size, &offset, pstart, pgroup - pstart);
pstart = pgroup;
}
}
if ('\0' != *pstart)
zbx_strcpy_alloc(&ptr, &size, &offset, pstart);
out:
return ptr;
}
/*********************************************************************************
* *
* Function: regexp_sub *
* *
* Purpose: Test if a string matches the specified regular expression. If yes *
* then create a return value by substituting '\<n>' sequences in *
* output template with the captured groups. *
* *
* Parameters: string - [IN] the string to parse *
* pattern - [IN] the regular expression *
* output_template - [IN] the output string template. The output *
* string is constructed from template by *
* replacing \<n> sequences with the captured *
* regexp group. *
* If output template is NULL or contains *
* empty string then the whole input string *
* is used as output value. *
* flags - [IN] the regcomp() function flags. *
* See regcomp() manual. *
* *
* Return value: Allocated string containing output value if the input *
* string matches the specified regular expression or NULL *
* otherwise. *
* *
*********************************************************************************/
static char *regexp_sub(const char *string, const char *pattern, const char *output_template, int flags)
{
static regex_t re;
regmatch_t match[10]; /* up to 10 capture groups in regexp */
char *ptr = NULL;
static char *old_pattern = NULL;
static int old_flags;
if (NULL == string)
return NULL;
if (NULL == output_template || '\0' == *output_template)
flags |= REG_NOSUB;
/* performance optimization: if possible then reuse the last compiled regexp */
if (NULL == old_pattern)
goto compile;
if (0 != strcmp(old_pattern, pattern) || old_flags != flags)
regfree(&re);
else
goto execute;
compile:
if (0 == regcomp(&re, pattern, flags))
{
old_pattern = zbx_strdup(old_pattern, pattern);
old_flags = flags;
}
else
{
zbx_free(old_pattern);
return NULL;
}
execute:
if (0 == regexec(&re, string, ARRSIZE(match), match, 0))
ptr = regexp_sub_replace(string, output_template, match, ARRSIZE(match));
return ptr;
}
/*********************************************************************************
* *
* Function: zbx_regexp_sub *
* *
* Purpose: Test if a string matches the specified regular expression. If yes *
* then create a return value by substituting '\<n>' sequences in *
* output template with the captured groups. *
* *
* Parameters: string - [IN] the string to parse *
* pattern - [IN] the regular expression *
* output_template - [IN] the output string template. The output *
* string is constructed from template by *
* replacing \<n> sequences with the captured *
* regexp group. *
* *
* Return value: Allocated string containing resulting value or NULL if *
* the input string does not match the specified regular *
* expression. *
* *
* Comments: This function performs case sensitive match *
* *
*********************************************************************************/
char *zbx_regexp_sub(const char *string, const char *pattern, const char *output_template)
{
return regexp_sub(string, pattern, output_template, REG_EXTENDED | REG_NEWLINE);
}
/*********************************************************************************
* *
* Function: zbx_mregexp_sub *
* *
* Purpose: This function is similar to zbx_regexp_sub() with exception that *
* multiline matches are accepted. *
* *
*********************************************************************************/
char *zbx_mregexp_sub(const char *string, const char *pattern, const char *output_template)
{
return regexp_sub(string, pattern, output_template, REG_EXTENDED);
}
/******************************************************************************
* *
* Function: zbx_regexp_clean_expressions *
* *
* Purpose: frees expression data retrieved by DCget_expressions function or *
* prepared with add_regexp_ex() function calls *
* *
* Parameters: expressions - [IN] a vector of expression data pointers *
* *
******************************************************************************/
void zbx_regexp_clean_expressions(zbx_vector_ptr_t *expressions)
{
int i;
for (i = 0; i < expressions->values_num; i++)
{
zbx_expression_t *regexp = expressions->values[i];
zbx_free(regexp->name);
zbx_free(regexp->expression);
zbx_free(regexp);
}
expressions->values_num = 0;
}
void add_regexp_ex(zbx_vector_ptr_t *regexps, const char *name, const char *expression, int expression_type,
char exp_delimiter, int case_sensitive)
{
zbx_expression_t *regexp;
regexp = zbx_malloc(NULL, sizeof(zbx_expression_t));
regexp->name = zbx_strdup(NULL, name);
regexp->expression = zbx_strdup(NULL, expression);
regexp->expression_type = expression_type;
regexp->exp_delimiter = exp_delimiter;
regexp->case_sensitive = case_sensitive;
zbx_vector_ptr_append(regexps, regexp);
}
/**********************************************************************************
* *
* Function: regexp_match_ex_regsub *
* *
* Purpose: Test if the string matches regular expression with the specified *
* case sensitivity option and allocates output variable to store the *
* result if necessary. *
* *
* Parameters: string - [IN] the string to check *
* pattern - [IN] the regular expression *
* case_sensitive - [IN] ZBX_IGNORE_CASE - case insensitive match. *
* ZBX_CASE_SENSITIVE - case sensitive match. *
* output_template - [IN] the output string template. The output *
* string is constructed from the template by *
* replacing \<n> sequences with the captured *
* regexp group. *
* If output_template is NULL the whole *
* matched string is returned. *
* output - [OUT] a reference to the variable where allocated *
* memory containing the resulting value *
* (substitution) is stored. *
* Specify NULL to skip output value creation. *
* *
* Return value: SUCCEED - the string matches the specified regular expression *
* FAIL - the string does not match the specified regular *
* expression *
* *
**********************************************************************************/
static int regexp_match_ex_regsub(const char *string, const char *pattern, int case_sensitive,
const char *output_template, char **output)
{
char *ptr = NULL;
int regexp_flags = REG_EXTENDED | REG_NEWLINE;
if (ZBX_IGNORE_CASE == case_sensitive)
regexp_flags |= REG_ICASE;
if (NULL == output)
ptr = zbx_regexp(string, pattern, NULL, regexp_flags);
else
*output = ptr = regexp_sub(string, pattern, output_template, regexp_flags);
return NULL != ptr ? SUCCEED : FAIL;
}
/**********************************************************************************
* *
* Function: regexp_match_ex_substring *
* *
* Purpose: Test if the string contains substring with the specified case *
* sensitivity option. *
* *
* Parameters: string - [IN] the string to check *
* pattern - [IN] the substring to search *
* case_sensitive - [IN] ZBX_IGNORE_CASE - case insensitive search *
* ZBX_CASE_SENSITIVE - case sensitive search *
* *
* Return value: SUCCEED - string contains the specified substring *
* FAIL - string does not contain the specified substring *
* *
**********************************************************************************/
static int regexp_match_ex_substring(const char *string, const char *pattern, int case_sensitive)
{
char *ptr = NULL;
switch (case_sensitive)
{
case ZBX_CASE_SENSITIVE:
ptr = strstr(string, pattern);
break;
case ZBX_IGNORE_CASE:
ptr = zbx_strcasestr(string, pattern);
break;
}
return NULL != ptr ? SUCCEED : FAIL;
}
/**********************************************************************************
* *
* Function: regexp_match_ex_substring_list *
* *
* Purpose: Test if the string contains a substring from list with the specified *
* delimiter and case sensitivity option. *
* *
* Parameters: string - [IN] the string to check *
* pattern - [IN] the substring list *
* case_sensitive - [IN] ZBX_IGNORE_CASE - case insensitive search *
* ZBX_CASE_SENSITIVE - case sensitive search *
* delimiter - [IN] the delimiter separating items in the *
* substring list *
* *
* Return value: SUCCEED - string contains a substring from the list *
* FAIL - string contains no substrings from the list *
* *
**********************************************************************************/
static int regexp_match_ex_substring_list(const char *string, char *pattern, int case_sensitive, char delimiter)
{
int ret = FAIL;
char *s, *c;
for (s = pattern; '\0' != *s && SUCCEED != ret;)
{
if (NULL != (c = strchr(s, delimiter)))
*c = '\0';
ret = regexp_match_ex_substring(string, s, case_sensitive);
if (NULL != c)
{
*c = delimiter;
s = ++c;
}
else
break;
}
return ret;
}
/**********************************************************************************
* *
* Function: regexp_sub_ex *
* *
* Purpose: Test if the string matches regular expression with the specified *
* case sensitivity option and allocates output variable to store the *
* result if necessary. *
* *
* Parameters: regexps - [IN] the global regular expression array *
* string - [IN] the string to check *
* pattern - [IN] the regular expression or global regular *
* expression name (@<global regexp name>). *
* case_sensitive - [IN] ZBX_IGNORE_CASE - case insensitive match *
* ZBX_CASE_SENSITIVE - case sensitive match *
* output_template - [IN] the output string template. For regular *
* expressions (type Result is TRUE) output *
* string is constructed from the template by *
* replacing '\<n>' sequences with the *
* captured regexp group. *
* If output_template is NULL then the whole *
* matched string is returned. *
* output - [OUT] a reference to the variable where allocated *
* memory containing the resulting value *
* (substitution) is stored. *
* Specify NULL to skip output value creation. *
* *
* Return value: SUCCEED - the string matches the specified regular expression *
* FAIL - the string does not match the specified regular *
* expression *
* *
* Comments: For regular expressions and global regular expressions with 'Result *
* is TRUE' type the output_template substitution result is stored into *
* output variable. For the other global regular expression types the *
* whole string is stored into output variable. *
* *
**********************************************************************************/
int regexp_sub_ex(zbx_vector_ptr_t *regexps, const char *string, const char *pattern,
int case_sensitive, const char *output_template, char **output)
{
int i, ret = FAIL;
if (NULL == pattern || '\0' == *pattern)
{
/* always match when no pattern is specified */
ret = SUCCEED;
goto out;
}
if ('@' != *pattern)
{
ret = regexp_match_ex_regsub(string, pattern, case_sensitive, output_template, output);
goto out;
}
pattern++;
for (i = 0; i < regexps->values_num; i++)
{
zbx_expression_t *regexp = regexps->values[i];
if (0 != strcmp(regexp->name, pattern))
continue;
ret = FAIL;
switch (regexp->expression_type)
{
case EXPRESSION_TYPE_TRUE:
ret = regexp_match_ex_regsub(string, regexp->expression, regexp->case_sensitive,
output_template, output);
break;
case EXPRESSION_TYPE_FALSE:
ret = regexp_match_ex_regsub(string, regexp->expression, regexp->case_sensitive,
NULL, NULL);
/* invert output value */
ret = (SUCCEED == ret) ? FAIL : SUCCEED;
break;
case EXPRESSION_TYPE_INCLUDED:
ret = regexp_match_ex_substring(string, regexp->expression, regexp->case_sensitive);
break;
case EXPRESSION_TYPE_NOT_INCLUDED:
ret = regexp_match_ex_substring(string, regexp->expression, regexp->case_sensitive);
/* invert output value */
ret = (SUCCEED == ret) ? FAIL : SUCCEED;
break;
case EXPRESSION_TYPE_ANY_INCLUDED:
ret = regexp_match_ex_substring_list(string, regexp->expression, regexp->case_sensitive,
regexp->exp_delimiter);
break;
}
if (FAIL == ret)
break;
}
out:
if (SUCCEED == ret && NULL != output && NULL == *output)
{
/* Handle output value allocation for global regular expression types */
/* that cannot perform output_template substitution (practically */
/* all global regular expression types except EXPRESSION_TYPE_TRUE). */
size_t offset = 0, size = 0;
zbx_strcpy_alloc(output, &size, &offset, string);
}
return ret;
}
int regexp_match_ex(zbx_vector_ptr_t *regexps, const char *string, const char *pattern, int case_sensitive)
{
return regexp_sub_ex(regexps, string, pattern, case_sensitive, NULL, NULL);
}
|