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15a53a4384
This function (and its sister regex_exec_match2()) abstract the regex execution but make it impossible to pass flags to the regex engine. Currently we don't use them but we'll need to support REG_NOTBOL soon (to indicate that we're not at the beginning of a line). So let's add support for this flag and update the API accordingly.
159 lines
4.9 KiB
C
159 lines
4.9 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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/* For pre-8.20 PCRE compatibility */
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#ifndef PCRE_STUDY_JIT_COMPILE
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#define PCRE_STUDY_JIT_COMPILE 0
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#endif
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#else /* no PCRE */
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#include <regex.h>
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#endif
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struct my_regex {
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#ifdef USE_PCRE
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pcre *reg;
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pcre_extra *extra;
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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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#endif
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#else /* no PCRE */
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regex_t regex;
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#endif
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};
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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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struct my_regex *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, struct my_regex *regex, int cs, int cap, char **err);
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int exp_replace(char *dst, unsigned int dst_size, 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, struct my_regex *preg,
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int action, const char *replace, void *cond);
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/* If the function doesn't match, it returns false, else it returns true.
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*/
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static inline int regex_exec(const struct my_regex *preg, char *subject) {
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#if defined(USE_PCRE) || defined(USE_PCRE_JIT)
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if (pcre_exec(preg->reg, preg->extra, subject, strlen(subject), 0, 0, NULL, 0) < 0)
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return 0;
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return 1;
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#else
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int match;
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match = regexec(&preg->regex, subject, 0, NULL, 0);
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if (match == REG_NOMATCH)
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return 0;
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return 1;
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#endif
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}
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/* Note that <subject> MUST be at least <length+1> characters long and must
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* be writable because the function will temporarily force a zero past the
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* last character.
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*
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* If the function doesn't match, it returns false, else it returns true.
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*/
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static inline int regex_exec2(const struct my_regex *preg, char *subject, int length) {
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#if defined(USE_PCRE) || defined(USE_PCRE_JIT)
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if (pcre_exec(preg->reg, preg->extra, subject, length, 0, 0, NULL, 0) < 0)
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return 0;
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return 1;
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#else
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int match;
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char old_char = subject[length];
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subject[length] = 0;
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match = regexec(&preg->regex, subject, 0, NULL, 0);
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subject[length] = old_char;
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if (match == REG_NOMATCH)
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return 0;
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return 1;
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#endif
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}
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int regex_exec_match(const struct my_regex *preg, const char *subject,
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size_t nmatch, regmatch_t pmatch[], int flags);
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int regex_exec_match2(const struct my_regex *preg, char *subject, int length,
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size_t nmatch, regmatch_t pmatch[], int flags);
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static inline void regex_free(struct my_regex *preg) {
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#if defined(USE_PCRE) || defined(USE_PCRE_JIT)
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pcre_free(preg->reg);
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/* PCRE < 8.20 requires pcre_free() while >= 8.20 requires pcre_study_free(),
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* which is easily detected using PCRE_CONFIG_JIT.
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*/
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#ifdef PCRE_CONFIG_JIT
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pcre_free_study(preg->extra);
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#else /* PCRE_CONFIG_JIT */
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pcre_free(preg->extra);
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#endif /* PCRE_CONFIG_JIT */
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#else
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regfree(&preg->regex);
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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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