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The current file "regex.h" define an abstraction for the regex. It provides the same struct name and the same "regexec" function for the 3 regex types supported: standard libc, basic pcre and jit pcre. The regex compilation function is not provided by this file. If the developper wants to use regex, he must write regex compilation code containing "#define *JIT*". This patch provides a unique regex compilation function according to the compilation options. In addition, the "regex.h" file checks the presence of the "#define PCRE_CONFIG_JIT" when "USE_PCRE_JIT" is enabled. If this flag is not present, the pcre lib doesn't support JIT and "#error" is emitted.
111 lines
3.4 KiB
C
111 lines
3.4 KiB
C
/*
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* include/common/regex.h
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* This file defines everything related to regular expressions.
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*
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* Copyright (C) 2000-2010 Willy Tarreau - w@1wt.eu
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation, version 2.1
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* exclusively.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef _COMMON_REGEX_H
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#define _COMMON_REGEX_H
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#include <stdlib.h>
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#include <common/config.h>
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#ifdef USE_PCRE
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#include <pcre.h>
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#include <pcreposix.h>
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#ifdef USE_PCRE_JIT
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#ifndef PCRE_CONFIG_JIT
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#error "The PCRE lib doesn't support JIT. Change your lib, or remove the option USE_PCRE_JIT."
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#endif
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struct jit_regex {
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pcre *reg;
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pcre_extra *extra;
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};
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typedef struct jit_regex regex;
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#else /* no PCRE_JIT */
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typedef regex_t regex;
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#endif
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#else /* no PCRE */
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#include <regex.h>
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typedef regex_t regex;
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#endif
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/* what to do when a header matches a regex */
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#define ACT_ALLOW 0 /* allow the request */
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#define ACT_REPLACE 1 /* replace the matching header */
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#define ACT_REMOVE 2 /* remove the matching header */
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#define ACT_DENY 3 /* deny the request */
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#define ACT_PASS 4 /* pass this header without allowing or denying the request */
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#define ACT_TARPIT 5 /* tarpit the connection matching this request */
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#define ACT_SETBE 6 /* switch the backend */
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struct hdr_exp {
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struct hdr_exp *next;
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const regex_t *preg; /* expression to look for */
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int action; /* ACT_ALLOW, ACT_REPLACE, ACT_REMOVE, ACT_DENY */
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const char *replace; /* expression to set instead */
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void *cond; /* a possible condition or NULL */
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};
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extern regmatch_t pmatch[MAX_MATCH];
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/* "str" is the string that contain the regex to compile.
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* "regex" is preallocated memory. After the execution of this function, this
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* struct contain the compiled regex.
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* "cs" is the case sensitive flag. If cs is true, case sensitive is enabled.
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* "cap" is capture flag. If cap if true the regex can capture into
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* parenthesis strings.
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* "err" is the standar error message pointer.
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*
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* The function return 1 is succes case, else return 0 and err is filled.
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*/
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int regex_comp(const char *str, regex *regex, int cs, int cap, char **err);
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int exp_replace(char *dst, char *src, const char *str, const regmatch_t *matches);
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const char *check_replace_string(const char *str);
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const char *chain_regex(struct hdr_exp **head, const regex_t *preg,
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int action, const char *replace, void *cond);
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static inline int regex_exec(const regex *preg, const char *subject, int length) {
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#ifdef USE_PCRE_JIT
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return pcre_exec(preg->reg, preg->extra, subject, length, 0, 0, NULL, 0);
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#else
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return regexec(preg, subject, 0, NULL, 0);
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#endif
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}
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static inline void regex_free(regex *preg) {
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#ifdef USE_PCRE_JIT
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pcre_free_study(preg->extra);
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pcre_free(preg->reg);
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#else
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regfree(preg);
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#endif
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}
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#endif /* _COMMON_REGEX_H */
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/*
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* Local variables:
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* c-indent-level: 8
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* c-basic-offset: 8
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* End:
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*/
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