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