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b1dd9bf308
Being able to map prefixes to values is already used for IPv4/IPv6 but was not yet used with strings. It can be very convenient to map directories to server farms but large lists may be slow. By using ebmb_insert_prefix() and ebmb_lookup_longest(), we can insert strings with their own length as a prefix, and lookup candidate strings and ensure that the longest matching one will be returned, which is the longest string matching the entry.
215 lines
9.1 KiB
C
215 lines
9.1 KiB
C
/*
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* include/proto/pattern.h
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* This file provides structures and types for pattern matching.
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*
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* Copyright (C) 2000-2013 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 _PROTO_PATTERN_H
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#define _PROTO_PATTERN_H
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#include <string.h>
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#include <common/config.h>
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#include <common/standard.h>
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#include <types/pattern.h>
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/* pattern management function arrays */
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extern char *pat_match_names[PAT_MATCH_NUM];
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extern int (*pat_parse_fcts[PAT_MATCH_NUM])(const char *, struct pattern *, int, char **);
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extern int (*pat_index_fcts[PAT_MATCH_NUM])(struct pattern_expr *, struct pattern *, char **);
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extern void (*pat_delete_fcts[PAT_MATCH_NUM])(struct pattern_expr *, struct pat_ref_elt *);
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extern void (*pat_prune_fcts[PAT_MATCH_NUM])(struct pattern_expr *);
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extern struct pattern *(*pat_match_fcts[PAT_MATCH_NUM])(struct sample *, struct pattern_expr *, int);
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extern int pat_match_types[PAT_MATCH_NUM];
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void pattern_finalize_config(void);
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/* return the PAT_MATCH_* index for match name "name", or < 0 if not found */
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static inline int pat_find_match_name(const char *name)
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{
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int i;
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for (i = 0; i < PAT_MATCH_NUM; i++)
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if (strcmp(name, pat_match_names[i]) == 0)
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return i;
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return -1;
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}
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/* This function executes a pattern match on a sample. It applies pattern <expr>
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* to sample <smp>. The function returns NULL if the sample dont match. It returns
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* non-null if the sample match. If <fill> is true and the sample match, the
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* function returns the matched pattern. In many cases, this pattern can be a
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* static buffer.
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*/
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struct pattern *pattern_exec_match(struct pattern_head *head, struct sample *smp, int fill);
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/*
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*
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* The following function gets "pattern", duplicate it and index it in "expr"
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*
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*/
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int pat_idx_list_val(struct pattern_expr *expr, struct pattern *pat, char **err);
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int pat_idx_list_ptr(struct pattern_expr *expr, struct pattern *pat, char **err);
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int pat_idx_list_str(struct pattern_expr *expr, struct pattern *pat, char **err);
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int pat_idx_list_reg(struct pattern_expr *expr, struct pattern *pat, char **err);
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int pat_idx_tree_ip(struct pattern_expr *expr, struct pattern *pat, char **err);
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int pat_idx_tree_str(struct pattern_expr *expr, struct pattern *pat, char **err);
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int pat_idx_tree_pfx(struct pattern_expr *expr, struct pattern *pat, char **err);
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/*
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*
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* The following functions search pattern <pattern> into the pattern
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* expression <expr>. If the pattern is found, delete it. This function
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* never fails.
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*
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*/
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void pat_del_list_val(struct pattern_expr *expr, struct pat_ref_elt *ref);
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void pat_del_tree_ip(struct pattern_expr *expr, struct pat_ref_elt *ref);
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void pat_del_list_ptr(struct pattern_expr *expr, struct pat_ref_elt *ref);
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void pat_del_tree_str(struct pattern_expr *expr, struct pat_ref_elt *ref);
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void pat_del_list_reg(struct pattern_expr *expr, struct pat_ref_elt *ref);
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/*
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*
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* The following functions clean all entries of a pattern expression and
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* reset the tree and list root.
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*
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*/
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void pat_prune_val(struct pattern_expr *expr);
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void pat_prune_ptr(struct pattern_expr *expr);
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void pat_prune_reg(struct pattern_expr *expr);
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/*
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*
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* The following functions are general purpose pattern matching functions.
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*
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*/
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/* ignore the current line */
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int pat_parse_nothing(const char *text, struct pattern *pattern, int mflags, char **err);
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/* Parse an integer. It is put both in min and max. */
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int pat_parse_int(const char *text, struct pattern *pattern, int mflags, char **err);
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/* Parse an version. It is put both in min and max. */
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int pat_parse_dotted_ver(const char *text, struct pattern *pattern, int mflags, char **err);
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/* Parse a range of integers delimited by either ':' or '-'. If only one
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* integer is read, it is set as both min and max.
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*/
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int pat_parse_range(const char *text, struct pattern *pattern, int mflags, char **err);
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/* Parse a string. It is allocated and duplicated. */
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int pat_parse_str(const char *text, struct pattern *pattern, int mflags, char **err);
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/* Parse a hexa binary definition. It is allocated and duplicated. */
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int pat_parse_bin(const char *text, struct pattern *pattern, int mflags, char **err);
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/* Parse a regex. It is allocated. */
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int pat_parse_reg(const char *text, struct pattern *pattern, int mflags, char **err);
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/* Parse an IP address and an optional mask in the form addr[/mask].
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* The addr may either be an IPv4 address or a hostname. The mask
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* may either be a dotted mask or a number of bits. Returns 1 if OK,
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* otherwise 0.
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*/
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int pat_parse_ip(const char *text, struct pattern *pattern, int mflags, char **err);
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/* NB: For two strings to be identical, it is required that their lengths match */
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struct pattern *pat_match_str(struct sample *smp, struct pattern_expr *expr, int fill);
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/* NB: For two binary buffers to be identical, it is required that their lengths match */
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struct pattern *pat_match_bin(struct sample *smp, struct pattern_expr *expr, int fill);
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/* Checks that the length of the pattern in <test> is included between min and max */
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struct pattern *pat_match_len(struct sample *smp, struct pattern_expr *expr, int fill);
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/* Checks that the integer in <test> is included between min and max */
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struct pattern *pat_match_int(struct sample *smp, struct pattern_expr *expr, int fill);
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/* always return false */
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struct pattern *pat_match_nothing(struct sample *smp, struct pattern_expr *expr, int fill);
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/* Checks that the pattern matches the end of the tested string. */
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struct pattern *pat_match_end(struct sample *smp, struct pattern_expr *expr, int fill);
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/* Checks that the pattern matches the beginning of the tested string. */
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struct pattern *pat_match_beg(struct sample *smp, struct pattern_expr *expr, int fill);
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/* Checks that the pattern is included inside the tested string. */
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struct pattern *pat_match_sub(struct sample *smp, struct pattern_expr *expr, int fill);
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/* Checks that the pattern is included inside the tested string, but enclosed
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* between slashes or at the beginning or end of the string. Slashes at the
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* beginning or end of the pattern are ignored.
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*/
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struct pattern *pat_match_dir(struct sample *smp, struct pattern_expr *expr, int fill);
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/* Checks that the pattern is included inside the tested string, but enclosed
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* between dots or at the beginning or end of the string. Dots at the beginning
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* or end of the pattern are ignored.
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*/
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struct pattern *pat_match_dom(struct sample *smp, struct pattern_expr *expr, int fill);
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/* Check that the IPv4 address in <test> matches the IP/mask in pattern */
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struct pattern *pat_match_ip(struct sample *smp, struct pattern_expr *expr, int fill);
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/* Executes a regex. It temporarily changes the data to add a trailing zero,
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* and restores the previous character when leaving.
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*/
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struct pattern *pat_match_reg(struct sample *smp, struct pattern_expr *expr, int fill);
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/*
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* pattern_ref manipulation.
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*/
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struct pat_ref *pat_ref_lookup(const char *reference);
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struct pat_ref *pat_ref_lookupid(int unique_id);
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struct pat_ref *pat_ref_new(const char *reference, const char *display, unsigned int flags);
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struct pat_ref *pat_ref_newid(int unique_id, const char *display, unsigned int flags);
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struct pat_ref_elt *pat_ref_find_elt(struct pat_ref *ref, const char *key);
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int pat_ref_append(struct pat_ref *ref, char *pattern, char *sample, int line);
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int pat_ref_add(struct pat_ref *ref, const char *pattern, const char *sample, char **err);
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int pat_ref_set(struct pat_ref *ref, const char *pattern, const char *sample, char **err);
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int pat_ref_set_by_id(struct pat_ref *ref, struct pat_ref_elt *refelt, const char *value, char **err);
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int pat_ref_delete(struct pat_ref *ref, const char *key);
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int pat_ref_delete_by_id(struct pat_ref *ref, struct pat_ref_elt *refelt);
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void pat_ref_prune(struct pat_ref *ref);
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int pat_ref_load(struct pat_ref *ref, struct pattern_expr *expr, int patflags, int soe, char **err);
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void pat_ref_reload(struct pat_ref *ref, struct pat_ref *replace);
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/*
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* pattern_head manipulation.
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*/
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void pattern_init_head(struct pattern_head *head);
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void pattern_prune(struct pattern_head *head);
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int pattern_read_from_file(struct pattern_head *head, unsigned int refflags, const char *filename, int patflags, int load_smp, char **err, const char *file, int line);
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/*
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* pattern_expr manipulation.
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*/
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void pattern_init_expr(struct pattern_expr *expr);
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struct pattern_expr *pattern_lookup_expr(struct pattern_head *head, struct pat_ref *ref);
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struct pattern_expr *pattern_new_expr(struct pattern_head *head, struct pat_ref *ref, char **err);
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struct sample_storage **pattern_find_smp(struct pattern_expr *expr, struct pat_ref_elt *elt);
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int pattern_delete(struct pattern_expr *expr, struct pat_ref_elt *ref);
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#endif
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