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|
%{
/*
* Copyright (C) 2013-2014 Tobias Brunner
* Hochschule fuer Technik Rapperswil
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program 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 General Public License
* for more details.
*/
#define _GNU_SOURCE /* for asprintf() */
#include <stdio.h>
#include <utils/parser_helper.h>
#include <settings/settings_types.h>
#include <parser/conf_parser.h>
#include "parser.h"
#define YYDEBUG 1
/**
* Defined by the lexer
*/
int conf_parser_lex(YYSTYPE *lvalp, void *scanner);
int conf_parser_lex_init_extra(parser_helper_t *extra, void *scanner);
int conf_parser_lex_destroy(void *scanner);
int conf_parser_set_in(FILE *in, void *scanner);
void conf_parser_set_debug(int debug, void *scanner);
char *conf_parser_get_text(void *scanner);
int conf_parser_get_leng(void *scanner);
int conf_parser_get_lineno(void *scanner);
/* Custom functions in lexer */
bool conf_parser_open_next_file(parser_helper_t *ctx);
/**
* Forward declaration
*/
static void conf_parser_error(parser_helper_t *ctx, const char *s);
/**
* Make sure to call lexer with the proper context
*/
#undef yylex
static int yylex(YYSTYPE *lvalp, parser_helper_t *ctx)
{
return conf_parser_lex(lvalp, ctx->scanner);
}
%}
%debug
/* generate verbose error messages */
%error-verbose
/* generate a reentrant parser */
%define api.pure
/* prefix function/variable declarations */
%name-prefix "conf_parser_"
/* interact properly with the reentrant lexer */
%lex-param {parser_helper_t *ctx}
%parse-param {parser_helper_t *ctx}
/* types for terminal symbols... */
%union {
char *s;
conf_parser_section_t t;
}
%token <s> STRING
%token EQ SPACES NEWLINE CONFIG_SETUP CONN CA
/* ...and other symbols */
%type <t> section_type
%type <s> section_name value
/* make the equal sign left associative */
%left EQ
/* properly destroy STRING tokens, which are strdup()ed, on errors */
%destructor { free($$); } STRING section_name value
/* there are two shift/reduce conflicts because we allow empty lines (and lines
* with spaces) within settings and anywhere else (i.e. in the beginning) */
//%expect 2
%%
/**
* ipsec.conf grammar rules
*/
statements:
/* empty */
| statements NEWLINE
| statements statement
;
statement:
section
| SPACES setting
;
section:
section_type section_name
{
if ($1 != CONF_PARSER_CONFIG_SETUP && (!$2 || !strlen($2)))
{
PARSER_DBG1(ctx, "section name missing");
free($2);
YYERROR;
}
conf_parser_t *parser = (conf_parser_t*)ctx->context;
parser->add_section(parser, $1, $2);
}
;
section_type:
CONFIG_SETUP
{
$$ = CONF_PARSER_CONFIG_SETUP;
}
|
CONN
{
$$ = CONF_PARSER_CONN;
}
|
CA
{
$$ = CONF_PARSER_CA;
}
;
section_name:
/* empty */
{
$$ = NULL;
}
| STRING
{
$$ = $1;
}
;
setting:
/* empty */
|
STRING EQ value
{
if (!strlen($1))
{
PARSER_DBG1(ctx, "setting name can't be empty");
free($1);
free($3);
YYERROR;
}
conf_parser_t *parser = (conf_parser_t*)ctx->context;
parser->add_setting(parser, $1, $value);
}
|
STRING EQ
{
if (!strlen($1))
{
PARSER_DBG1(ctx, "setting name can't be empty");
free($1);
YYERROR;
}
conf_parser_t *parser = (conf_parser_t*)ctx->context;
parser->add_setting(parser, $1, NULL);
}
|
STRING
{
PARSER_DBG1(ctx, "missing value for setting '%s'", $1);
free($1);
YYERROR;
}
;
value:
STRING
| value STRING
{ /* just put a single space between them, use strings for more */
if (asprintf(&$$, "%s %s", $1, $2) < 0)
{
free($1);
free($2);
YYERROR;
}
free($1);
free($2);
}
;
%%
/**
* Referenced by the generated parser
*/
static void conf_parser_error(parser_helper_t *ctx, const char *s)
{
char *text = conf_parser_get_text(ctx->scanner);
int len = conf_parser_get_leng(ctx->scanner);
if (len && text[len-1] == '\n')
{ /* cut off newline at the end to avoid muti-line log messages */
len--;
}
PARSER_DBG1(ctx, "%s [%.*s]", s, (int)len, text);
}
/**
* Parse the given file
*/
bool conf_parser_parse_file(conf_parser_t *this, char *name)
{
parser_helper_t *helper;
bool success = FALSE;
helper = parser_helper_create(this);
helper->get_lineno = conf_parser_get_lineno;
if (conf_parser_lex_init_extra(helper, &helper->scanner) != 0)
{
helper->destroy(helper);
return FALSE;
}
helper->file_include(helper, name);
if (!conf_parser_open_next_file(helper))
{
DBG1(DBG_CFG, "failed to open config file '%s'", name);
}
else
{
if (getenv("DEBUG_CONF_PARSER"))
{
yydebug = 1;
conf_parser_set_debug(1, helper->scanner);
}
success = yyparse(helper) == 0;
if (!success)
{
DBG1(DBG_CFG, "invalid config file '%s'", name);
}
}
conf_parser_lex_destroy(helper->scanner);
helper->destroy(helper);
return success;
}
|
