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/*
* ProFTPD - FTP server daemon
* Copyright (c) 2001-2021 The ProFTPD Project team
*
* 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, Suite 500, Boston, MA 02110-1335, USA.
*
* As a special exemption, The ProFTPD Project team and other respective
* copyright holders give permission to link this program with OpenSSL, and
* distribute the resulting executable, without including the source code for
* OpenSSL in the source distribution.
*/
/* Regular expression management */
#ifndef PR_REGEXP_H
#define PR_REGEXP_H
/* We define our own wrapper struct, pr_regex_t, in order to abstract the
* differences between POSIX regexes and PCRE regexes from the calling
* code.
*/
#if defined(PR_USE_PCRE2)
# define PCRE2_CODE_UNIT_WIDTH 8
# include <pcre2.h>
# include <pcre2posix.h>
# define PR_USE_REGEX 1
#elif defined(PR_USE_PCRE)
# include <pcre.h>
# include <pcreposix.h>
/* Make sure that we are using PCRE-7.0 or later. */
# if defined(PCRE_MAJOR) && PCRE_MAJOR >= 7 && \
defined(PCRE_MINOR) && PCRE_MINOR >= 0
# define PR_USE_REGEX 1
# else
# error "pcre-7.0 or later required"
# endif /* PCRE-7.0 or later */
#else
# if defined(HAVE_REGEX_H)
# include <regex.h>
# ifdef HAVE_REGCOMP
# define PR_USE_REGEX 1
# endif /* HAVE_REGCOMP */
# endif /* HAVE_REGEX_H */
#endif /* !PR_USE_PCRE2 and !PR_USE_PCRE */
typedef struct regexp_rec pr_regex_t;
pr_regex_t *pr_regexp_alloc(module *m);
void pr_regexp_free(module *m, pr_regex_t *pre);
/* Callers wishing to explicitly use POSIX regular expressions, regardless
* of PCRE support, should use this function.
*/
int pr_regexp_compile_posix(pr_regex_t *pre, const char *pattern, int flags);
/* If PCRE support is enabled, the given pattern will be compiled as a
* PCRE regular expression, otherwise it will be compiled as a POSIX
* regular expression.
*/
int pr_regexp_compile(pr_regex_t *pre, const char *pattern, int flags);
size_t pr_regexp_error(int res, const pr_regex_t *pre, char *buf, size_t bufsz);
/* Returns the original pattern used to compile the regular expression, if
* present.
*/
const char *pr_regexp_get_pattern(const pr_regex_t *pre);
int pr_regexp_exec(pr_regex_t *pre, const char *str, size_t nmatches,
regmatch_t *matches, int flags, unsigned long match_limit,
unsigned long match_limit_recursion);
/* Used to set default limits on the matching, if no such limits are
* explicitly provided by the calling code. These limits can be set e.g.
* for the entire vhost/daemon.
*
* NOTE: The match limits are only properly honored when PCRE support is
* enabled.
*/
int pr_regexp_set_limits(unsigned long match_limit,
unsigned long match_limit_recursion);
/* Set the "engine" to use for regular expressions, e.g. "POSIX" or "PCRE".
* The engine value is handled case-insensitively. This is useful for treating
* all regular expressions as POSIX expressions, regardless of PCRE support,
* as when there are PCRE implementation issues.
*/
int pr_regexp_set_engine(const char *engine);
/* For internal use only */
void init_regexp(void);
#endif /* PR_REGEXP_H */
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