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Parse CLI commands. We use the same parser as for configuration files (because

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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.
This commit is contained in:
Martin Mares 1999-10-31 17:47:47 +00:00
parent b9672a845f
commit bc2fb68098
9 changed files with 108 additions and 32 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

38
conf/cf-lex.l
View File

@ -34,14 +34,12 @@ static struct keyword {
static struct keyword *kw_hash[KW_HASH_SIZE];
static struct symbol **sym_hash;
static int allow_new_symbols;
int conf_lino;
static int cf_hash(byte *c);
static struct symbol *cf_find_sym(byte *c, unsigned int h0);
pool *cfg_pool;
linpool *cfg_mem;
int (*cf_read_hook)(byte *buf, unsigned int max);
@ -54,7 +52,7 @@ int (*cf_read_hook)(byte *buf, unsigned int max);
%option noyywrap
%x COMMENT CCOMM
%x COMMENT CCOMM CLI
ALPHA [a-zA-Z_]
DIGIT [0-9]
@ -121,6 +119,11 @@ WHITE [ \t]
return SYM;
}
<CLI>! {
BEGIN(INITIAL);
return CLI_MARKER;
}
[={}:;,()+*/%-<>~\[\]] {
return yytext[0];
}
@ -174,17 +177,18 @@ static struct symbol *
cf_find_sym(byte *c, unsigned int h0)
{
unsigned int h = h0 & (SYM_HASH_SIZE-1);
struct symbol *s = sym_hash[h];
struct symbol *s;
int l;
while (s)
{
if (!strcmp(s->name, c))
return s;
s = s->next;
}
if (!allow_new_symbols)
return NULL;
if (!sym_hash)
sym_hash = cfg_allocz(SYM_HASH_SIZE * sizeof(struct keyword *));
else
for(s = sym_hash[h]; s; s=s->next)
{
if (!strcmp(s->name, c))
return s;
s = s->next;
}
l = strlen(c);
if (l > SYM_MAX_LEN)
cf_error("Symbol too long");
@ -230,11 +234,15 @@ cf_define_symbol(struct symbol *sym, int type, void *def)
}
void
cf_lex_init(int flag)
cf_lex_init(int is_cli)
{
if (allow_new_symbols = flag)
sym_hash = cfg_allocz(SYM_HASH_SIZE * sizeof(struct keyword *));
sym_hash = NULL;
conf_lino = 1;
yyrestart(NULL);
if (is_cli)
BEGIN(CLI);
else
BEGIN(INITIAL);
}
void

17
conf/conf.c
View File

@ -39,15 +39,12 @@ config_alloc(byte *name)
int
config_parse(struct config *c)
{
struct proto_config *p;
debug("Parsing configuration file `%s'\n", c->file_name);
new_config = c;
cfg_pool = c->pool;
cfg_mem = c->mem;
if (setjmp(conf_jmpbuf))
return 0;
cf_lex_init(1);
cf_lex_init(0);
cf_lex_init_tables();
protos_preconfig(c);
rt_preconfig(c);
@ -61,6 +58,18 @@ config_parse(struct config *c)
return 1;
}
int
cli_parse(struct config *c)
{
new_config = c;
cfg_mem = c->mem;
if (setjmp(conf_jmpbuf))
return 0;
cf_lex_init(1);
cf_parse();
return 1;
}
void
config_free(struct config *c)
{

4
conf/conf.h
View File

@ -30,13 +30,13 @@ extern struct config *config, *new_config;
struct config *config_alloc(byte *name);
int config_parse(struct config *);
int cli_parse(struct config *);
void config_free(struct config *);
void config_commit(struct config *);
void cf_error(char *msg, ...) NORET;
/* Pools */
extern pool *cfg_pool;
extern linpool *cfg_mem;
#define cfg_alloc(size) lp_alloc(cfg_mem, size)
@ -71,7 +71,7 @@ extern int conf_lino;
void cf_lex_init_tables(void);
int cf_lex(void);
void cf_lex_init(int flag);
void cf_lex_init(int is_cli);
struct symbol *cf_find_symbol(byte *c);
struct symbol *cf_default_name(char *prefix, int *counter);
void cf_define_symbol(struct symbol *symbol, int type, void *def);

10
conf/confbase.Y
View File

@ -16,8 +16,11 @@ CF_HDR
#include "nest/protocol.h"
#include "nest/iface.h"
#include "nest/route.h"
#include "nest/cli.h"
#include "filter/filter.h"
#define cli_msg(x...) cli_printf(this_cli, x)
CF_DECLS
%union {
@ -34,7 +37,7 @@ CF_DECLS
struct password_item *p;
}
%token END
%token END CLI_MARKER
%token <i> NUM
%token <i32> RTRID
%token <a> IPA
@ -54,9 +57,8 @@ CF_GRAMMAR
/* Basic config file structure */
config: conf_entries END {
return 0;
}
config: conf_entries END { return 0; }
| CLI_MARKER cli_cmd END { return 0; }
;
conf_entries:

6
conf/gen_keywords.m4
View File

@ -2,7 +2,7 @@ m4_divert(-1)m4_dnl
#
# BIRD -- Generator of Configuration Keyword List
#
# (c) 1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
# (c) 1998--1999 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
#
# Can be freely distributed and used under the terms of the GNU GPL.
#
@ -18,6 +18,10 @@ m4_define(CF_keywd, `m4_ifdef([[CF_tok_$1]],,[[m4_define([[CF_tok_$1]],1)CF_hand
m4_define(CF_KEYWORDS, `m4_define([[CF_toks]],[[]])CF_iterate([[CF_keywd]], [[$@]])m4_ifelse(CF_toks,,,%token[[]]CF_toks
)DNL')
# CLI commands generate keywords as well
m4_define(CF_CLI, `CF_KEYWORDS(m4_translit($1, [[ ]], [[,]]))
')
# As we are processing C source, we must access all M4 primitives via
# m4_* and also set different quoting convention: `[[' and ']]'
m4_changequote([[,]])

8
conf/gen_parser.m4
View File

@ -2,7 +2,7 @@ m4_divert(-1)m4_dnl
#
# BIRD -- Generator of Configuration Grammar
#
# (c) 1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
# (c) 1998--1999 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
#
# Can be freely distributed and used under the terms of the GNU GPL.
#
@ -38,6 +38,12 @@ m4_define(CF_dyn_rules,)
m4_define(CF_ADDTO, `m4_define([[CF_rule_$1]],m4_ifdef([[CF_rule_$1]],CF_rule_$1 | ,[[m4_define([[CF_dyn_rules]],CF_dyn_rules[[CF_RULE($1)
]])]])$2)DNL')
# CLI commands
m4_define(CF_CLI, `m4_define([[CF_cmd]], cmd_[[]]m4_translit($1, [[ ]], _))DNL
m4_divert(2)CF_KEYWORDS(m4_translit($1, [[ ]], [[,]]))
m4_divert(3)CF_ADDTO(cli_cmd, CF_cmd)
CF_cmd: $1 ')
# After all configuration templates end, we finally generate the grammar file.
m4_m4wrap(`
m4_divert(0)DNL

50
nest/cli.c
View File

@ -7,8 +7,9 @@
*/
#include "nest/bird.h"
#include "lib/string.h"
#include "nest/cli.h"
#include "conf/conf.h"
#include "lib/string.h"
pool *cli_pool;
@ -88,6 +89,47 @@ cli_free_out(cli *c)
}
}
static byte *cli_rh_pos;
static unsigned int cli_rh_len;
static int cli_rh_trick_flag;
struct cli *this_cli;
static int
cli_cmd_read_hook(byte *buf, unsigned int max)
{
if (!cli_rh_trick_flag)
{
cli_rh_trick_flag = 1;
buf[0] = '!';
return 1;
}
if (max > cli_rh_len)
max = cli_rh_len;
memcpy(buf, cli_rh_pos, max);
cli_rh_pos += max;
cli_rh_len -= max;
return max;
}
static void
cli_command(struct cli *c)
{
struct config f;
int res;
f.pool = NULL;
f.mem = c->parser_pool;
cf_read_hook = cli_cmd_read_hook;
cli_rh_pos = c->rx_buf;
cli_rh_len = strlen(c->rx_buf);
cli_rh_trick_flag = 0;
this_cli = c;
res = cli_parse(&f);
lp_flush(c->parser_pool);
if (!res)
cli_printf(c, 9001, f.err_msg);
}
static int
cli_event(void *data)
{
@ -106,10 +148,7 @@ cli_event(void *data)
if (err < 0)
cli_printf(c, 9000, "Command too long");
else
{
cli_printf(c, -9001, "Parse error in:");
cli_printf(c, 9001, c->rx_buf);
}
cli_command(c);
}
if (cli_write(c))
{
@ -133,6 +172,7 @@ cli_new(void *priv)
c->tx_buf = c->tx_pos = c->tx_write = NULL;
c->cont = cli_hello;
c->last_reply = 0;
c->parser_pool = lp_new(c->pool, 4096);
ev_schedule(c->event);
return c;
}

2
nest/cli.h
View File

@ -31,9 +31,11 @@ typedef struct cli {
void (*cont)(struct cli *c);
void *rover; /* Private to continuation routine */
int last_reply;
struct linpool *parser_pool; /* Pool used during parsing */
} cli;
extern pool *cli_pool;
extern struct cli *this_cli; /* Used during parsing */
/* Functions to be called by command handlers */

5
nest/config.Y
View File

@ -182,6 +182,11 @@ password_list:
}
;
/* Core commands */
CF_CLI(TEST LEDS, <N>, [[Flashes each LED <N> times]]) NUM { cli_msg(0, "%d", $3); } ;
CF_CLI(TEST, 1, 2) { cli_msg(0, "OK"); }
CF_CODE
CF_END