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.

conf/cf-lex.l

@@ -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

conf/conf.c

@@ -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)
 {

conf/conf.h

@@ -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);

conf/confbase.Y

@@ -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:

conf/gen_keywords.m4

@@ -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([[,]])

conf/gen_parser.m4

@@ -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

nest/cli.c

@@ -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;
 }

nest/cli.h

@@ -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 */
 

nest/config.Y

@@ -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