188 lines
4.1 KiB
Plaintext
188 lines
4.1 KiB
Plaintext
/*
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* BIRD -- Configuration Parser Top
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*
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* (c) 1998--2000 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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/**
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* DOC: Parser
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*
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* Both the configuration and CLI commands are analysed using a syntax
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* driven parser generated by the |bison| tool from a grammar which
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* is constructed from information gathered from grammar snippets by
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* the |gen_parser.m4| script.
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*
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* Grammar snippets are files (usually with extension |.Y|) contributed
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* by various BIRD modules to provide information about syntax of their
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* configuration and their CLI commands. Each snipped consists of several
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* section, each of them starting with a special keyword: |CF_HDR| for
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* a list of |#include| directives needed by the C code, |CF_DEFINES|
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* for a list of C declarations, |CF_DECLS| for |bison| declarations
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* including keyword definitions specified as |CF_KEYWORDS|, |CF_GRAMMAR|
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* for the grammar rules, |CF_CODE| for auxillary C code and finally
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* |CF_END| at the end of the snippet.
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*
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* To create references between the snippets, it's possible to define
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* multi-part rules by utilizing the |CF_ADDTO| macro which adds a new
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* alternative to a multi-part rule.
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*
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* CLI commands are defined using a |CF_CLI| macro. Its parameters are:
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* the list of keywords determining the command, the list of paramaters,
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* help text for the parameters and help text for the command.
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*
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* Values of |enum| filter types can be defined using |CF_ENUM| with
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* the following parameters: name of filter type, prefix common for all
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* literals of this type, names of all the possible values.
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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 "lib/string.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 "nest/cli.h"
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#include "filter/filter.h"
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/* FIXME: Turn on YYERROR_VERBOSE and work around lots of bison bugs? */
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CF_DECLS
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%union {
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int i;
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u32 i32;
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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 rtable_config *r;
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struct f_inst *x;
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struct filter *f;
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struct f_tree *e;
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struct f_val v;
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struct f_path_mask *h;
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struct password_item *p;
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struct rt_show_data *ra;
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void *g;
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bird_clock_t time;
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struct prefix px;
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}
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%token END CLI_MARKER INVALID_TOKEN
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%token GEQ LEQ NEQ AND OR
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%token <i> NUM ENUM
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%token <i32> RTRID
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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> expr bool pxlen
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%type <time> datetime
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%type <a> ipa
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%type <px> prefix prefix_or_ipa
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%nonassoc PREFIX_DUMMY
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%nonassoc '=' '<' '>' '~' '.' GEQ LEQ NEQ AND OR
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%left '+' '-'
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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 { return 0; }
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| CLI_MARKER cli_cmd { return 0; }
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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, ';')
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/* Constant expressions */
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expr:
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NUM
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| '(' term ')' { $$ = f_eval_int($2); }
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| SYM { if ($1->class != SYM_NUMBER) cf_error("Number expected"); else $$ = $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 '=' expr ';' {
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cf_define_symbol($2, SYM_NUMBER, NULL);
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$2->aux = $4;
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}
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| DEFINE SYM '=' IPA ';' {
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cf_define_symbol($2, SYM_IPA, cfg_alloc(sizeof(ip_addr)));
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*(ip_addr *)$2->def = $4;
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}
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;
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/* Switches */
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bool:
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expr {$$ = !!$1; }
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| ON { $$ = 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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/* Addresses, prefixes and netmasks */
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ipa:
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IPA
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| SYM {
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if ($1->class != SYM_IPA) cf_error("IP address expected");
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$$ = *(ip_addr *)$1->def;
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}
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;
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prefix:
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ipa pxlen {
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if (!ip_is_prefix($1, $2)) cf_error("Invalid prefix");
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$$.addr = $1; $$.len = $2;
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}
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;
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prefix_or_ipa:
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prefix
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| ipa { $$.addr = $1; $$.len = BITS_PER_IP_ADDRESS; }
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;
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pxlen:
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'/' expr {
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if ($2 < 0 || $2 > BITS_PER_IP_ADDRESS) cf_error("Invalid prefix length %d", $2);
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$$ = $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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datetime:
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TEXT {
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$$ = tm_parse_date($1);
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if (!$$)
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cf_error("Invalid date");
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}
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;
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CF_CODE
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CF_END
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