1998-11-27 19:36:06 +00:00
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/*
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* BIRD -- Configuration Parser Top
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*
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2000-03-01 11:42:13 +00:00
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* (c) 1998--2000 Martin Mares <mj@ucw.cz>
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1998-11-27 19:36:06 +00:00
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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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2000-06-03 18:23:00 +00:00
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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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1998-11-27 19:36:06 +00:00
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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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1998-11-27 21:09:57 +00:00
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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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2000-03-31 23:30:21 +00:00
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#include "lib/string.h"
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1998-11-27 21:09:57 +00:00
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#include "nest/protocol.h"
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1998-11-29 22:03:58 +00:00
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#include "nest/iface.h"
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1998-12-06 17:38:42 +00:00
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#include "nest/route.h"
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Parse CLI commands. We use the same parser as for configuration files (because
we want to allow filter and similar complex constructs to be used in commands
and we should avoid code duplication), only with CLI_MARKER token prepended
before the whole input.
Defined macro CF_CLI(cmd, args, help) for defining CLI commands in .Y files.
The first argument specifies the command itself, the remaining two arguments
are copied to the help file (er, will be copied after the help file starts
to exist). This macro automatically creates a skeleton rule for the command,
you only need to append arguments as in:
CF_CLI(STEAL MONEY, <$>, [[Steal <$> US dollars or equivalent in any other currency]]): NUM {
cli_msg(0, "%d$ stolen", $3);
} ;
Also don't forget to reset lexer state between inputs.
1999-10-31 17:47:47 +00:00
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#include "nest/cli.h"
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1999-01-15 16:49:17 +00:00
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#include "filter/filter.h"
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1998-11-27 19:36:06 +00:00
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1999-12-02 14:03:25 +00:00
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/* FIXME: Turn on YYERROR_VERBOSE and work around lots of bison bugs? */
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1998-11-27 19:36:06 +00:00
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CF_DECLS
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%union {
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int i;
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1999-08-03 19:36:06 +00:00
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u32 i32;
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1998-11-27 19:36:06 +00:00
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ip_addr a;
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struct symbol *s;
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char *t;
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1999-05-17 20:14:52 +00:00
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struct rtable_config *r;
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1999-03-17 14:29:39 +00:00
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struct f_inst *x;
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struct filter *f;
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1999-04-12 19:58:18 +00:00
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struct f_tree *e;
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struct f_val v;
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2000-04-12 13:07:53 +00:00
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struct f_path_mask *h;
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1999-05-26 14:24:32 +00:00
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struct password_item *p;
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1999-12-01 15:10:21 +00:00
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struct rt_show_data *ra;
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1999-12-06 13:50:50 +00:00
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void *g;
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2000-03-01 11:42:13 +00:00
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bird_clock_t time;
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2000-05-13 11:17:49 +00:00
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struct prefix px;
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1998-11-27 19:36:06 +00:00
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}
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2000-03-01 11:30:16 +00:00
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%token END CLI_MARKER INVALID_TOKEN
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2000-06-01 08:43:29 +00:00
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%token GEQ LEQ NEQ AND OR
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1999-11-15 11:35:41 +00:00
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%token <i> NUM ENUM
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1999-08-03 19:36:06 +00:00
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%token <i32> RTRID
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1998-11-27 19:36:06 +00:00
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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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2000-03-01 11:42:13 +00:00
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%type <i> expr bool pxlen
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%type <time> datetime
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2000-05-15 11:48:23 +00:00
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%type <a> ipa
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2000-05-13 11:41:26 +00:00
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%type <px> prefix prefix_or_ipa
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1998-11-27 21:32:45 +00:00
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2000-05-16 14:24:33 +00:00
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%nonassoc PREFIX_DUMMY
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2000-06-01 08:43:29 +00:00
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%nonassoc '=' '<' '>' '~' '.' GEQ LEQ NEQ AND OR
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1998-11-27 21:32:45 +00:00
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%left '+' '-'
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%left '*' '/' '%'
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1999-04-07 12:11:08 +00:00
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%left '!'
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1998-11-27 21:32:45 +00:00
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1998-12-06 17:38:42 +00:00
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CF_KEYWORDS(DEFINE, ON, OFF, YES, NO)
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1998-11-27 21:32:45 +00:00
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1998-11-27 19:36:06 +00:00
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CF_GRAMMAR
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1998-11-27 21:32:45 +00:00
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/* Basic config file structure */
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Parse CLI commands. We use the same parser as for configuration files (because
we want to allow filter and similar complex constructs to be used in commands
and we should avoid code duplication), only with CLI_MARKER token prepended
before the whole input.
Defined macro CF_CLI(cmd, args, help) for defining CLI commands in .Y files.
The first argument specifies the command itself, the remaining two arguments
are copied to the help file (er, will be copied after the help file starts
to exist). This macro automatically creates a skeleton rule for the command,
you only need to append arguments as in:
CF_CLI(STEAL MONEY, <$>, [[Steal <$> US dollars or equivalent in any other currency]]): NUM {
cli_msg(0, "%d$ stolen", $3);
} ;
Also don't forget to reset lexer state between inputs.
1999-10-31 17:47:47 +00:00
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config: conf_entries END { return 0; }
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1999-11-17 12:00:21 +00:00
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| CLI_MARKER cli_cmd { return 0; }
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1998-11-27 19:36:06 +00:00
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;
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conf_entries:
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/* EMPTY */
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1999-03-29 19:04:14 +00:00
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| conf_entries conf
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1998-11-27 19:36:06 +00:00
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;
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1999-03-29 19:04:14 +00:00
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CF_ADDTO(conf, ';')
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1998-11-27 19:36:06 +00:00
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1999-01-15 14:41:51 +00:00
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/* Constant expressions */
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1998-11-27 21:32:45 +00:00
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1999-01-15 18:04:28 +00:00
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expr:
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1998-11-27 21:32:45 +00:00
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NUM
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2000-05-15 12:15:18 +00:00
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| '(' term ')' { $$ = f_eval_int($2); }
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1998-11-27 21:32:45 +00:00
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| SYM { if ($1->class != SYM_NUMBER) cf_error("Number expected"); else $$ = $1->aux; }
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;
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CF_ADDTO(conf, definition)
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definition:
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1999-03-29 19:04:14 +00:00
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DEFINE SYM '=' expr ';' {
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1999-05-17 20:14:52 +00:00
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cf_define_symbol($2, SYM_NUMBER, NULL);
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1998-11-27 21:32:45 +00:00
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$2->aux = $4;
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}
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2000-05-15 11:48:23 +00:00
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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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1998-11-27 21:32:45 +00:00
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;
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1998-12-06 17:38:42 +00:00
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/* Switches */
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bool:
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1999-01-15 18:04:28 +00:00
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expr {$$ = !!$1; }
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1998-12-06 17:38:42 +00:00
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| ON { $$ = 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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2000-05-15 11:48:23 +00:00
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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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$$ = *(ip_addr *)$1->def;
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}
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;
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1998-12-06 23:10:45 +00:00
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2000-05-13 11:17:49 +00:00
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prefix:
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2000-05-15 11:48:23 +00:00
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ipa pxlen {
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2000-05-13 11:17:49 +00:00
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if (!ip_is_prefix($1, $2)) cf_error("Invalid prefix");
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$$.addr = $1; $$.len = $2;
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}
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;
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2000-05-13 11:41:26 +00:00
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prefix_or_ipa:
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prefix
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2000-05-15 11:48:23 +00:00
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| ipa { $$.addr = $1; $$.len = BITS_PER_IP_ADDRESS; }
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2000-05-13 11:41:26 +00:00
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;
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1998-12-06 23:10:45 +00:00
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pxlen:
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2000-05-15 11:48:23 +00:00
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'/' expr {
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2000-05-04 20:02:19 +00:00
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if ($2 < 0 || $2 > BITS_PER_IP_ADDRESS) cf_error("Invalid prefix length %d", $2);
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1998-12-06 23:10:45 +00:00
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$$ = $2;
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}
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2000-05-15 11:48:23 +00:00
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| ':' ipa {
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1998-12-06 23:10:45 +00:00
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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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2000-03-04 21:27:57 +00:00
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datetime:
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2000-03-01 11:42:13 +00:00
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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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1999-05-26 14:24:32 +00:00
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;
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1998-11-27 19:36:06 +00:00
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CF_CODE
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CF_END
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