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/*
* include/haproxy/cfgcond-t.h
* Types for the configuration condition preprocessor
*
* Copyright (C) 2000-2021 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_CFGCOND_T_H
#define _HAPROXY_CFGCOND_T_H
#include <haproxy/api-t.h>
/* nested if/elif/else/endif block states */
enum nested_cond_state {
NESTED_COND_IF_TAKE, // "if" with a true condition
NESTED_COND_IF_DROP, // "if" with a false condition
NESTED_COND_IF_SKIP, // "if" masked by an outer false condition
NESTED_COND_ELIF_TAKE, // "elif" with a true condition from a false one
NESTED_COND_ELIF_DROP, // "elif" with a false condition from a false one
NESTED_COND_ELIF_SKIP, // "elif" masked by an outer false condition or a previously taken if
NESTED_COND_ELSE_TAKE, // taken "else" after an if false condition
NESTED_COND_ELSE_DROP, // "else" masked by outer false condition or an if true condition
};
/* 100 levels of nested conditions should already be sufficient */
#define MAXNESTEDCONDS 100
/* supported conditional predicates for .if/.elif */
enum cond_predicate {
CFG_PRED_NONE, // none
CFG_PRED_DEFINED, // "defined"
CFG_PRED_FEATURE, // "feature"
CFG_PRED_STREQ, // "streq"
CFG_PRED_STRNEQ, // "strneq"
CFG_PRED_STRSTR, // "strstr"
CFG_PRED_VERSION_ATLEAST, // "version_atleast"
CFG_PRED_VERSION_BEFORE, // "version_before"
CFG_PRED_OSSL_VERSION_ATLEAST, // "openssl_version_atleast"
CFG_PRED_OSSL_VERSION_BEFORE, // "openssl_version_before"
CFG_PRED_SSLLIB_NAME_STARTSWITH, // "ssllib_name_startswith"
CFG_PRED_ENABLED, // "enabled"
};
/* types for condition terms */
enum cfg_cond_term_type {
CCTT_NONE = 0,
CCTT_FALSE,
CCTT_TRUE,
CCTT_PRED,
CCTT_PAREN, // '(' EXPR ')'
};
/* keyword for a condition predicate */
struct cond_pred_kw {
const char *word; // NULL marks the end of the list
enum cond_predicate prd; // one of the CFG_PRED_* above
uint64_t arg_mask; // mask of supported arguments (strings only)
};
/* condition term */
struct cfg_cond_term {
enum cfg_cond_term_type type; // CCTT_*
struct arg *args; // arguments for predicates
int neg; // 0: direct result; 1: negate
union {
const struct cond_pred_kw *pred; // predicate (function)
struct cfg_cond_expr *expr; // expression for CCTT_PAREN
};
};
/* condition sub-expression for an AND:
* expr_and = <term> '&&' <expr_and>
* | <term>
*/
struct cfg_cond_and {
struct cfg_cond_term *left;
struct cfg_cond_and *right; // may be NULL
};
/* condition expression:
* expr = <expr_and> '||' <expr>
* | <expr_and>
*/
struct cfg_cond_expr {
struct cfg_cond_and *left;
struct cfg_cond_expr *right; // may be NULL
};
#endif /* _HAPROXY_CFGCOND_T_H */
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