| /* |
| * include/types/pattern.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 _TYPES_PATTERN_H |
| #define _TYPES_PATTERN_H |
| |
| #include <common/compat.h> |
| #include <common/config.h> |
| #include <common/mini-clist.h> |
| #include <common/regex.h> |
| |
| #include <types/sample.h> |
| |
| #include <ebmbtree.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 arithmetics 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 expressions or patterns */ |
| enum { |
| PAT_F_IGNORE_CASE = 1 << 0, /* ignore case */ |
| PAT_F_FROM_FILE = 1 << 1, /* pattern comes from a file */ |
| PAT_F_TREE_OK = 1 << 2, /* the pattern parser is allowed to build a tree */ |
| PAT_F_TREE = 1 << 3, /* some patterns are arranged in a tree */ |
| }; |
| |
| /* 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) */ |
| /* keep this one last */ |
| PAT_MATCH_NUM |
| }; |
| |
| /* How to store a time range and the valid days in 29 bits */ |
| struct pat_time { |
| int dow:7; /* 1 bit per day of week: 0-6 */ |
| int h1:5, m1:6; /* 0..24:0..60. Use 0:0 for all day. */ |
| int h2:5, m2:6; /* 0..24:0..60. Use 24:0 for all day. */ |
| }; |
| |
| /* This contain each tree indexed entry. This struct permit to associate |
| * "sample" with a tree entry. It is used with maps. |
| */ |
| struct pat_idx_elt { |
| struct sample_storage *smp; |
| 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 { |
| struct list list; /* chaining */ |
| int type; /* type of the ACL pattern (SMP_T_*) */ |
| union { |
| int i; /* integer value */ |
| struct { |
| signed long long min, max; |
| int min_set :1; |
| 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 */ |
| struct pat_time time; /* valid hours and days */ |
| unsigned int group_mask; |
| struct eb_root *tree; /* tree storing all values if any */ |
| } val; /* direct value */ |
| union { |
| void *ptr; /* any data */ |
| char *str; /* any string */ |
| regex *reg; /* a compiled regex */ |
| } ptr; /* indirect values, allocated */ |
| void(*freeptrbuf)(void *ptr); /* a destructor able to free objects from the ptr */ |
| int len; /* data length when required */ |
| int flags; /* expr or pattern flags. */ |
| struct sample_storage *smp; /* used to store a pointer to sample value associated |
| with the match. It is used with maps */ |
| |
| }; |
| |
| /* 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 { |
| int (*parse)(const char **text, struct pattern *pattern, struct sample_storage *smp, int *opaque, char **err); |
| enum pat_match_res (*match)(struct sample *smp, struct pattern *pattern); |
| struct list patterns; /* list of acl_patterns */ |
| struct eb_root pattern_tree; /* may be used for lookup in large datasets */ |
| }; |
| |
| extern char *pat_match_names[PAT_MATCH_NUM]; |
| extern int (*pat_parse_fcts[PAT_MATCH_NUM])(const char **, struct pattern *, struct sample_storage *, int *, char **); |
| extern enum pat_match_res (*pat_match_fcts[PAT_MATCH_NUM])(struct sample *, struct pattern *); |
| |
| #endif /* _TYPES_PATTERN_H */ |