102 lines
3.4 KiB
C
102 lines
3.4 KiB
C
/*
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* Support for PCRE regex variant
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*
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* Copyright (C) 2013-2022 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
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* Copyright (C) 2007-2013 Sourcefire, Inc.
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*
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* Authors: Kevin Lin
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*/
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#ifndef _REGEX_PCRE_H_
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#define _REGEX_PCRE_H_
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#if HAVE_CONFIG_H
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#include "clamav-config.h"
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#endif
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#if HAVE_PCRE
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#if USING_PCRE2
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#define PCRE2_CODE_UNIT_WIDTH 8
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#include <pcre2.h>
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#else
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#include <pcre.h>
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#endif
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#include "clamav-types.h"
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#include "mpool.h"
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/* used for setting overrides */
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#define CLI_PCREMATCH_NOOFFSETOVERRIDE -1
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/* must be multiple of 3 */
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#define OVECCOUNT 300
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#if USING_PCRE2
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struct cli_pcre_data {
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pcre2_code *re; /* compiled pcre regex */
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pcre2_match_context *mctx; /* match context */
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int options; /* pcre options */
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char *expression; /* copied regular expression */
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uint32_t search_offset; /* start offset to search at for pcre_exec */
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};
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struct cli_pcre_results {
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cl_error_t err;
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uint32_t match[2]; /* populated by cli_pcre_match to be start (0) and end (1) offset of match */
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pcre2_match_data *match_data;
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};
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#else
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struct cli_pcre_data {
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pcre *re; /* compiled pcre regex */
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pcre_extra *ex; /* pcre extra data - limits */
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int options; /* pcre options */
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char *expression; /* copied regular expression */
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uint32_t search_offset; /* start offset to search at for pcre_exec */
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};
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struct cli_pcre_results {
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cl_error_t err;
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uint32_t match[2]; /* populated by cli_pcre_match to be start (0) and end (1) offset of match */
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int ovector[OVECCOUNT];
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};
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#endif
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cl_error_t cli_pcre_init_internal(void);
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cl_error_t cli_pcre_addoptions(struct cli_pcre_data *pd, const char **opt, int errout);
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cl_error_t cli_pcre_compile(struct cli_pcre_data *pd, long long unsigned match_limit, long long unsigned match_limit_recursion, unsigned int options, int opt_override);
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/**
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* @brief perform a pcre match on a string
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*
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* @param pd
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* @param buffer
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* @param buflen
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* @param override_offset
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* @param options
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* @param results
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* @return int greater than zero if a match. 0 if no match. A PCRE2_ERROR_* error code if something went wrong.
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*/
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int cli_pcre_match(struct cli_pcre_data *pd, const unsigned char *buffer, size_t buflen, size_t override_offset, int options, struct cli_pcre_results *results);
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void cli_pcre_report(const struct cli_pcre_data *pd, const unsigned char *buffer, size_t buflen, int rc, struct cli_pcre_results *results);
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cl_error_t cli_pcre_results_reset(struct cli_pcre_results *results, const struct cli_pcre_data *pd);
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void cli_pcre_results_free(struct cli_pcre_results *results);
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void cli_pcre_free_single(struct cli_pcre_data *pd);
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#endif /* HAVE_PCRE */
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#endif /*_REGEX_PCRE_H_*/
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