/include/common/regex.h
C Header | 120 lines | 66 code | 13 blank | 41 comment | 0 complexity | a52cdfd723a618faec20cc4e9c6012fc MD5 | raw file
Possible License(s): LGPL-2.1, GPL-2.0
- /*
- * include/common/regex.h
- * This file defines everything related to regular expressions.
- *
- * Copyright (C) 2000-2010 Willy Tarreau - w@1wt.eu
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation, version 2.1
- * exclusively.
- *
- * This library 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
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
- #ifndef _COMMON_REGEX_H
- #define _COMMON_REGEX_H
- #include <stdlib.h>
- #include <common/config.h>
- #ifdef USE_PCRE
- #include <pcre.h>
- #include <pcreposix.h>
- #else /* no PCRE */
- #include <regex.h>
- #endif
- struct my_regex {
- #ifdef USE_PCRE
- #ifdef USE_PCRE_JIT
- #ifndef PCRE_CONFIG_JIT
- #error "The PCRE lib doesn't support JIT. Change your lib, or remove the option USE_PCRE_JIT."
- #endif
- pcre *reg;
- pcre_extra *extra;
- #else /* no PCRE_JIT */
- regex_t regex;
- #endif
- #else /* no PCRE */
- regex_t regex;
- #endif
- };
- /* what to do when a header matches a regex */
- #define ACT_ALLOW 0 /* allow the request */
- #define ACT_REPLACE 1 /* replace the matching header */
- #define ACT_REMOVE 2 /* remove the matching header */
- #define ACT_DENY 3 /* deny the request */
- #define ACT_PASS 4 /* pass this header without allowing or denying the request */
- #define ACT_TARPIT 5 /* tarpit the connection matching this request */
- #define ACT_SETBE 6 /* switch the backend */
- struct hdr_exp {
- struct hdr_exp *next;
- const regex_t *preg; /* expression to look for */
- int action; /* ACT_ALLOW, ACT_REPLACE, ACT_REMOVE, ACT_DENY */
- const char *replace; /* expression to set instead */
- void *cond; /* a possible condition or NULL */
- };
- extern regmatch_t pmatch[MAX_MATCH];
- /* "str" is the string that contain the regex to compile.
- * "regex" is preallocated memory. After the execution of this function, this
- * struct contain the compiled regex.
- * "cs" is the case sensitive flag. If cs is true, case sensitive is enabled.
- * "cap" is capture flag. If cap if true the regex can capture into
- * parenthesis strings.
- * "err" is the standar error message pointer.
- *
- * The function return 1 is succes case, else return 0 and err is filled.
- */
- int regex_comp(const char *str, struct my_regex *regex, int cs, int cap, char **err);
- int exp_replace(char *dst, unsigned int dst_size, char *src, const char *str, const regmatch_t *matches);
- const char *check_replace_string(const char *str);
- const char *chain_regex(struct hdr_exp **head, const regex_t *preg,
- int action, const char *replace, void *cond);
- /* Note that <subject> MUST be at least <length+1> characters long and must
- * be writable because the function will temporarily force a zero past the
- * last character.
- */
- static inline int regex_exec(const struct my_regex *preg, char *subject, int length) {
- #ifdef USE_PCRE_JIT
- return pcre_exec(preg->reg, preg->extra, subject, length, 0, 0, NULL, 0);
- #else
- int match;
- char old_char = subject[length];
- subject[length] = 0;
- match = regexec(&preg->regex, subject, 0, NULL, 0);
- subject[length] = old_char;
- return match;
- #endif
- }
- static inline void regex_free(struct my_regex *preg) {
- #ifdef USE_PCRE_JIT
- pcre_free_study(preg->extra);
- pcre_free(preg->reg);
- #else
- regfree(&preg->regex);
- #endif
- }
- #endif /* _COMMON_REGEX_H */
- /*
- * Local variables:
- * c-indent-level: 8
- * c-basic-offset: 8
- * End:
- */