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|
/*
* BIRD -- Configuration Parser Top
*
* (c) 1998 Martin Mares <mj@ucw.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
CF_HDR
#include "nest/bird.h"
#include "conf/conf.h"
#include "lib/resource.h"
#include "lib/socket.h"
#include "lib/timer.h"
#include "nest/protocol.h"
#include "nest/iface.h"
#include "nest/route.h"
#include "filter/filter.h"
CF_DECLS
%union {
int i;
ip_addr a;
struct symbol *s;
char *t;
struct f_instruction *x;
}
%token END
%token <i> NUM
%token <a> IPA
%token <s> SYM
%token <t> TEXT
%type <i> cexpr bool pxlen
%type <x> expr
%left '+' '-'
%left '*' '/' '%'
CF_KEYWORDS(DEFINE, ON, OFF, YES, NO)
CF_GRAMMAR
/* Basic config file structure */
config: conf_entries END {
return 0;
}
;
conf_entries:
/* EMPTY */
| conf_entries conf ';'
;
CF_ADDTO(conf, /* EMPTY */)
/* Constant expressions */
cexpr:
NUM
| cexpr '+' cexpr { $$ = $1 + $3; }
| cexpr '-' cexpr { $$ = $1 - $3; }
| cexpr '*' cexpr { $$ = $1 * $3; }
| cexpr '/' cexpr { if ($3) $$ = $1 / $3; else cf_error("Division by zero"); }
| cexpr '%' cexpr { if ($3) $$ = $1 % $3; else cf_error("Division by zero"); }
| '(' cexpr ')' { $$ = $2; }
| SYM { if ($1->class != SYM_NUMBER) cf_error("Number expected"); else $$ = $1->aux; }
;
CF_ADDTO(conf, definition)
definition:
DEFINE SYM '=' cexpr {
if ($2->class != SYM_VOID) cf_error("Symbol already defined");
$2->class = SYM_NUMBER;
$2->aux = $4;
}
;
/* Switches */
bool:
cexpr {$$ = !!$1; }
| ON { $$ = 1; }
| YES { $$ = 1; }
| OFF { $$ = 0; }
| NO { $$ = 0; }
| /* Silence means agreement */ { $$ = 1; }
;
/* Prefixes and netmasks */
pxlen:
'/' NUM {
if ($2 < 0 || $2 > 32) cf_error("Invalid prefix length %d", $2);
$$ = $2;
}
| ':' IPA {
$$ = ipa_mklen($2);
if ($$ < 0) cf_error("Invalid netmask %I", $2);
}
;
CF_CODE
CF_END
|
