| /* |
| * include/haproxy/pattern-t.h |
| * This file provides structures and types for ACLs. |
| * |
| * Copyright (C) 2000-2012 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 _HAPROXY_PATTERN_T_H |
| #define _HAPROXY_PATTERN_T_H |
| |
| #include <import/ebmbtree.h> |
| |
| #include <haproxy/api-t.h> |
| #include <haproxy/regex-t.h> |
| #include <haproxy/sample_data-t.h> |
| #include <haproxy/thread-t.h> |
| |
| |
| /* Pattern matching function result. |
| * |
| * We're using a 3-state matching system to match samples against patterns in |
| * ACLs : |
| * - PASS : at least one pattern already matches |
| * - MISS : some data is missing to decide if some rules may finally match. |
| * - FAIL : no mattern may ever match |
| * |
| * We assign values 0, 1 and 3 to FAIL, MISS and PASS respectively, so that we |
| * can make use of standard arithmetic for the truth tables below : |
| * |
| * x | !x x&y | F(0) | M(1) | P(3) x|y | F(0) | M(1) | P(3) |
| * ------+----- -----+------+------+----- -----+------+------+----- |
| * F(0) | P(3) F(0)| F(0) | F(0) | F(0) F(0)| F(0) | M(1) | P(3) |
| * M(1) | M(1) M(1)| F(0) | M(1) | M(1) M(1)| M(1) | M(1) | P(3) |
| * P(3) | F(0) P(3)| F(0) | M(1) | P(3) P(3)| P(3) | P(3) | P(3) |
| * |
| * neg(x) = (3 >> x) and(x,y) = (x & y) or(x,y) = (x | y) |
| * |
| * For efficiency, the ACL return flags are directly mapped from the pattern |
| * match flags. A pattern can't return "MISS" since it's always presented an |
| * existing sample. So that leaves us with only two possible values : |
| * MATCH = 0 |
| * NOMATCH = 3 |
| */ |
| enum pat_match_res { |
| PAT_NOMATCH = 0, /* sample didn't match any pattern */ |
| PAT_MATCH = 3, /* sample matched at least one pattern */ |
| }; |
| |
| /* possible flags for patterns matching or parsing */ |
| enum { |
| PAT_MF_IGNORE_CASE = 1 << 0, /* ignore case */ |
| PAT_MF_NO_DNS = 1 << 1, /* don't perform any DNS requests */ |
| }; |
| |
| /* possible flags for patterns storage */ |
| enum { |
| PAT_SF_TREE = 1 << 0, /* some patterns are arranged in a tree */ |
| PAT_SF_REGFREE = 1 << 1, /* run regex_free() on the pointer */ |
| }; |
| |
| /* ACL match methods */ |
| enum { |
| PAT_MATCH_FOUND, /* just ensure that fetch found the sample */ |
| PAT_MATCH_BOOL, /* match fetch's integer value as boolean */ |
| PAT_MATCH_INT, /* unsigned integer (int) */ |
| PAT_MATCH_IP, /* IPv4/IPv6 address (IP) */ |
| PAT_MATCH_BIN, /* hex string (bin) */ |
| PAT_MATCH_LEN, /* string length (str -> int) */ |
| PAT_MATCH_STR, /* exact string match (str) */ |
| PAT_MATCH_BEG, /* beginning of string (str) */ |
| PAT_MATCH_SUB, /* substring (str) */ |
| PAT_MATCH_DIR, /* directory-like sub-string (str) */ |
| PAT_MATCH_DOM, /* domain-like sub-string (str) */ |
| PAT_MATCH_END, /* end of string (str) */ |
| PAT_MATCH_REG, /* regex (str -> reg) */ |
| PAT_MATCH_REGM, /* regex (str -> reg) with match zones */ |
| /* keep this one last */ |
| PAT_MATCH_NUM |
| }; |
| |
| #define PAT_REF_MAP 0x1 /* Set if the reference is used by at least one map. */ |
| #define PAT_REF_ACL 0x2 /* Set if the reference is used by at least one acl. */ |
| #define PAT_REF_SMP 0x4 /* Flag used if the reference contains a sample. */ |
| |
| /* This struct contain a list of reference strings for dunamically |
| * updatable patterns. |
| */ |
| struct pat_ref { |
| struct list list; /* Used to chain refs. */ |
| char *reference; /* The reference name. */ |
| char *display; /* String displayed to identify the pattern origin. */ |
| struct list head; /* The head of the list of struct pat_ref_elt. */ |
| struct list pat; /* The head of the list of struct pattern_expr. */ |
| unsigned int flags; /* flags PAT_REF_*. */ |
| int unique_id; /* Each pattern reference have unique id. */ |
| unsigned long long revision; /* updated for each update */ |
| __decl_thread(HA_SPINLOCK_T lock); /* Lock used to protect pat ref elements */ |
| }; |
| |
| /* This is a part of struct pat_ref. Each entry contain one |
| * pattern and one associated value as original string. |
| */ |
| struct pat_ref_elt { |
| struct list list; /* Used to chain elements. */ |
| struct list back_refs; /* list of users tracking this pat ref */ |
| char *pattern; |
| char *sample; |
| int line; |
| }; |
| |
| /* This contain each tree indexed entry. This struct permit to associate |
| * "sample" with a tree entry. It is used with maps. |
| */ |
| struct pattern_tree { |
| struct sample_data *data; |
| struct pat_ref_elt *ref; |
| struct ebmb_node node; |
| }; |
| |
| /* This describes one ACL pattern, which might be a single value or a tree of |
| * values. All patterns for a single ACL expression are linked together. Some |
| * of them might have a type (eg: IP). Right now, the types are shared with |
| * the samples, though it is possible that in the future this will change to |
| * accommodate for other types (eg: meth, regex). Unsigned and constant types |
| * are preferred when there is a doubt. |
| */ |
| struct pattern { |
| int type; /* type of the ACL pattern (SMP_T_*) */ |
| union { |
| int i; /* integer value */ |
| struct { |
| signed long long min, max; |
| unsigned int min_set:1; |
| unsigned int max_set:1; |
| } range; /* integer range */ |
| struct { |
| struct in_addr addr; |
| struct in_addr mask; |
| } ipv4; /* IPv4 address */ |
| struct { |
| struct in6_addr addr; |
| unsigned char mask; /* number of bits */ |
| } ipv6; /* IPv6 address/mask */ |
| } val; /* direct value */ |
| union { |
| void *ptr; /* any data */ |
| char *str; /* any string */ |
| struct my_regex *reg; /* a compiled regex */ |
| } ptr; /* indirect values, allocated or NULL */ |
| int len; /* data length when required */ |
| int sflags; /* flags relative to the storage method. */ |
| struct sample_data *data; /* used to store a pointer to sample value associated |
| with the match. It is used with maps */ |
| struct pat_ref_elt *ref; |
| }; |
| |
| /* This struct is just used for chaining patterns */ |
| struct pattern_list { |
| struct list list; |
| struct pattern pat; |
| }; |
| |
| /* Description of a pattern expression. |
| * It contains pointers to the parse and match functions, and a list or tree of |
| * patterns to test against. The structure is organized so that the hot parts |
| * are grouped together in order to optimize caching. |
| */ |
| struct pattern_expr { |
| struct list list; /* Used for chaining pattern_expr in pat_ref. */ |
| struct pat_ref *ref; /* The pattern reference if exists. */ |
| struct pattern_head *pat_head; /* Point to the pattern_head that contain manipulation functions. |
| * Note that this link point on compatible head but not on the real |
| * head. You can use only the function, and you must not use the |
| * "head". Don't write "(struct pattern_expr *)any->pat_head->expr". |
| */ |
| struct list patterns; /* list of acl_patterns */ |
| struct eb_root pattern_tree; /* may be used for lookup in large datasets */ |
| struct eb_root pattern_tree_2; /* may be used for different types */ |
| int mflags; /* flags relative to the parsing or matching method. */ |
| __decl_thread(HA_RWLOCK_T lock); /* lock used to protect patterns */ |
| }; |
| |
| /* This is a list of expression. A struct pattern_expr can be used by |
| * more than one "struct pattern_head". this intermediate struct |
| * permit more than one list. |
| */ |
| struct pattern_expr_list { |
| struct list list; /* Used for chaining pattern_expr in pattern_head. */ |
| int do_free; |
| struct pattern_expr *expr; /* The used expr. */ |
| }; |
| |
| |
| /* This struct contains a list of pattern expr */ |
| struct sample; |
| struct pattern_head { |
| int (*parse)(const char *text, struct pattern *pattern, int flags, char **err); |
| int (*parse_smp)(const char *text, struct sample_data *data); |
| int (*index)(struct pattern_expr *, struct pattern *, char **); |
| void (*delete)(struct pattern_expr *, struct pat_ref_elt *); |
| void (*prune)(struct pattern_expr *); |
| struct pattern *(*match)(struct sample *, struct pattern_expr *, int); |
| int expect_type; /* type of the expected sample (SMP_T_*) */ |
| |
| struct list head; /* This is a list of struct pattern_expr_list. */ |
| }; |
| |
| #endif /* _HAPROXY_PATTERN_T_H */ |