parser.c 90.2 KB
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/*
 * Copyright (C) 2000, 2001  Internet Software Consortium.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM
 * DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
 * INTERNET SOFTWARE CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT,
 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
 * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
 * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
 * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

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/* $Id: parser.c,v 1.40 2001/03/03 01:08:02 gson Exp $ */
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#include <config.h>

#include <isc/buffer.h>
#include <isc/dir.h>
#include <isc/lex.h>
#include <isc/log.h>
#include <isc/mem.h>
#include <isc/net.h>
#include <isc/netaddr.h>
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#include <isc/print.h>
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#include <isc/string.h>
#include <isc/sockaddr.h>
#include <isc/util.h>
#include <isc/symtab.h>

#include <isccfg/cfg.h>
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#include <isccfg/log.h>
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/* Shorthand */
#define CAT ISCCFG_LOGCATEGORY_CONFIG
#define MOD ISCCFG_LOGMODULE_PARSER
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/*
 * Pass one of these flags to parser_error() to include the
 * token text in log message.
 */
#define LOG_NEAR    0x00000001	/* Say "near <token>" */
#define LOG_BEFORE  0x00000002	/* Say "before <token>" */
#define LOG_NOPREP  0x00000004	/* Say just "<token>" */

#define MAP_SYM 1 	/* Unique type for isc_symtab */

/* Clause may occur multiple times (e.g., "zone") */
#define CFG_CLAUSEFLAG_MULTI 		0x00000001
/* Clause is obsolete */
#define CFG_CLAUSEFLAG_OBSOLETE 	0x00000002
/* Clause is not implemented, and may never be */
#define CFG_CLAUSEFLAG_NOTIMP	 	0x00000004
/* Clause is not implemented yet */
#define CFG_CLAUSEFLAG_NYI 		0x00000008
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/* Default value has changed since earlier release */
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#define CFG_CLAUSEFLAG_NEWDEFAULT	0x00000010
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/*
 * Clause needs to be interpreted during parsing
 * by calling a callback function, like the
 * "directory" option.
 */
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#define CFG_CLAUSEFLAG_CALLBACK		0x00000020
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/*
 * Flags defining whether to accept certain types of network addresses.
 */
#define V4OK 		0x00000001
#define V4PREFIXOK 	0x00000002
#define V6OK 		0x00000004
#define WILDOK		0x00000008

/* Check a return value. */
#define CHECK(op) 						\
     	do { result = (op); 					\
		if (result != ISC_R_SUCCESS) goto cleanup; 	\
	} while (0)

/* Clean up a configuration object if non-NULL. */
#define CLEANUP_OBJ(obj) \
	do { if ((obj) != NULL) cfg_obj_destroy(pctx, &(obj)); } while (0)


typedef struct cfg_clausedef cfg_clausedef_t;
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typedef struct cfg_tuplefielddef cfg_tuplefielddef_t;
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typedef struct cfg_printer cfg_printer_t;
typedef ISC_LIST(cfg_listelt_t) cfg_list_t;
typedef struct cfg_map cfg_map_t;
typedef struct cfg_rep cfg_rep_t;

/*
 * Function types for configuration object methods
 */

typedef isc_result_t (*cfg_parsefunc_t)(cfg_parser_t *, cfg_type_t *type,
					cfg_obj_t **);
typedef void	     (*cfg_printfunc_t)(cfg_printer_t *, cfg_obj_t *);
typedef void	     (*cfg_freefunc_t)(cfg_parser_t *, cfg_obj_t *);

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/*
 * Structure definitions
 */

/* The parser object. */
struct cfg_parser {
	isc_mem_t *	mctx;
	isc_log_t *	lctx;
	isc_lex_t *	lexer;
	unsigned int    errors;
	unsigned int    warnings;
	isc_token_t     token;

	/* We are at the end of all input. */
	isc_boolean_t	seen_eof;

	/* The current token has been pushed back. */
	isc_boolean_t	ungotten;

	/*
	 * A list of all files ever opened by this
	 * parser (including ones that have already
	 * been closed), as a configuration list of
	 * configuration strings.  The "file" fields of
	 * all other configuration objects point into
	 * this list so that each does not need its
	 * own copy of the filename strings.
	 */
	cfg_obj_t *	files;

	/*
	 * Current line number.  We maintain our own
	 * copy of this so that it is available even
	 * when a file has just been closed.
	 */
	unsigned int	line;
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	cfg_parsecallback_t callback;
	void *callbackarg;
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};

/* The printer object. */
struct cfg_printer {
	void (*f)(void *closure, const char *text, int textlen);
	void *closure;
	int indent;
};

/* A clause definition. */

struct cfg_clausedef {
	const char      *name;
	cfg_type_t      *type;
	unsigned int	flags;
};

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/* A tuple field definition. */

struct cfg_tuplefielddef {
	const char      *name;
	cfg_type_t      *type;
	unsigned int	flags;
};

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/* A configuration object type definition. */
struct cfg_type {
	const char *name;	/* For debugging purposes only */
	cfg_parsefunc_t  parse;
	cfg_printfunc_t  print;
	cfg_rep_t *	 rep;	/* Data representation */
	void *		 of;	/* For meta-types */
};

/* A keyword-type definition, for things like "port <integer>". */
typedef struct {
	const char *name;
	cfg_type_t *type;
} keyword_type_t;

struct cfg_map {
	cfg_obj_t	 *id; /* Used for 'named maps' like keys, zones, &c */
	cfg_clausedef_t  **clausesets; /* The clauses that can occur in
					  this map; used for printing */
	isc_symtab_t     *symtab;
};

typedef struct cfg_zone cfg_zone_t;

struct cfg_zone {
	cfg_obj_t *name;
	cfg_obj_t *class;
	cfg_obj_t *options;
};

typedef struct cfg_netprefix cfg_netprefix_t;

struct cfg_netprefix {
	isc_netaddr_t address; /* IP4/IP6 */
	unsigned int prefixlen;
};

/*
 * A configuration data representation.
 */
struct cfg_rep {
	const char *	name;	/* For debugging only */
	cfg_freefunc_t 	free;	/* How to free this kind of data. */
};

/*
 * A configuration object.  This is the main building block
 * of the configuration parse tree.
 */

struct cfg_obj {
	cfg_type_t *	 type;
	union {
		isc_uint32_t  	uint32;
		isc_textregion_t string;
		isc_boolean_t 	boolean;
		cfg_map_t	map;
		cfg_list_t	list;
		cfg_zone_t	zone;
		cfg_obj_t **	tuple;
		isc_sockaddr_t	sockaddr;
		cfg_netprefix_t netprefix;
	}               value;
	char *		file;
	unsigned int    line;
};


/* A list element. */
struct cfg_listelt {
	cfg_obj_t               *obj;
	ISC_LINK(cfg_listelt_t)  link;
};

/*
 * Forward declarations of static functions.
 */

static isc_result_t
create_cfgobj(cfg_parser_t *pctx, cfg_type_t *type, cfg_obj_t **objp);

static isc_result_t
create_list(cfg_parser_t *pctx, cfg_type_t *type, cfg_obj_t **objp);

static isc_result_t
create_listelt(cfg_parser_t *pctx, cfg_listelt_t **eltp);

static void
free_list(cfg_parser_t *pctx, cfg_obj_t *obj);

static isc_result_t
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create_string(cfg_parser_t *pctx, const char *contents, cfg_type_t *type,
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	      cfg_obj_t **ret);

static void
free_string(cfg_parser_t *pctx, cfg_obj_t *obj);

static isc_result_t
create_map(cfg_parser_t *pctx, cfg_type_t *type, cfg_obj_t **objp);

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static isc_result_t
create_tuple(cfg_parser_t *pctx, cfg_type_t *type, cfg_obj_t **objp);

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static void
free_map(cfg_parser_t *pctx, cfg_obj_t *obj);

static isc_result_t
get_addr(cfg_parser_t *pctx, unsigned int flags, isc_netaddr_t *na);

static void
print(cfg_printer_t *pctx, const char *text, int len);

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static void
print_void(cfg_printer_t *pctx, cfg_obj_t *obj);

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static isc_result_t
parse_mapbody(cfg_parser_t *pctx, cfg_type_t *type, cfg_obj_t **ret);

static void
print_mapbody(cfg_printer_t *pctx, cfg_obj_t *obj);

static isc_result_t
parse_map(cfg_parser_t *pctx, cfg_type_t *type, cfg_obj_t **ret);

static void
print_map(cfg_printer_t *pctx, cfg_obj_t *obj);

static isc_result_t
parse_named_map(cfg_parser_t *pctx, cfg_type_t *type, cfg_obj_t **ret);

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static isc_result_t
parse_addressed_map(cfg_parser_t *pctx, cfg_type_t *type, cfg_obj_t **ret);

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static isc_result_t
parse_list(cfg_parser_t *pctx, cfg_type_t *type, cfg_obj_t **ret);

static void
print_list(cfg_printer_t *pctx, cfg_obj_t *obj);

static isc_result_t
parse_tuple(cfg_parser_t *pctx, cfg_type_t *type, cfg_obj_t **ret);

static void
print_tuple(cfg_printer_t *pctx, cfg_obj_t *obj);

static void
free_tuple(cfg_parser_t *pctx, cfg_obj_t *obj);

static isc_result_t
parse_spacelist(cfg_parser_t *pctx, cfg_type_t *type, cfg_obj_t **ret);

static void
print_spacelist(cfg_printer_t *pctx, cfg_obj_t *obj);

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static void
print_sockaddr(cfg_printer_t *pctx, cfg_obj_t *obj);

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static isc_result_t
parse_addrmatchelt(cfg_parser_t *pctx, cfg_type_t *type, cfg_obj_t **ret);

static isc_result_t
parse_bracketed_list(cfg_parser_t *pctx, cfg_type_t *type, cfg_obj_t **ret);

static void
print_bracketed_list(cfg_printer_t *pctx, cfg_obj_t *obj);

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static isc_result_t
parse_keyvalue(cfg_parser_t *pctx, cfg_type_t *type, cfg_obj_t **ret);

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static isc_result_t
parse_optional_keyvalue(cfg_parser_t *pctx, cfg_type_t *type, cfg_obj_t **ret);

static void
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print_keyvalue(cfg_printer_t *pctx, cfg_obj_t *obj);
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static isc_result_t
parse_symtab_elt(cfg_parser_t *pctx, const char *name,
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		 cfg_type_t *elttype, isc_symtab_t *symtab,
		 isc_boolean_t callback);
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static void
free_noop(cfg_parser_t *pctx, cfg_obj_t *obj);

static isc_result_t
cfg_gettoken(cfg_parser_t *pctx, int options);

static void
cfg_ungettoken(cfg_parser_t *pctx);

static isc_result_t
cfg_peektoken(cfg_parser_t *pctx, int options);

static isc_result_t
cfg_getstringtoken(cfg_parser_t *pctx);

static void
parser_error(cfg_parser_t *pctx, unsigned int flags,
				 const char *fmt, ...);
static void
parser_warning(cfg_parser_t *pctx, unsigned int flags,
	       const char *fmt, ...);
static void
parser_complain(cfg_parser_t *pctx, isc_boolean_t is_warning,
		unsigned int flags, const char *format, va_list args);

static void
print_uint32(cfg_printer_t *pctx, cfg_obj_t *obj);

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static void
print_ustring(cfg_printer_t *pctx, cfg_obj_t *obj);

static isc_result_t
parse_enum(cfg_parser_t *pctx, cfg_type_t *type, cfg_obj_t **ret);

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/*
 * Data representations.  These correspond to members of the
 * "value" union in struct cfg_obj (except "void", which does
 * not need a union member).
 */
cfg_rep_t cfg_rep_uint32 = { "uint32", free_noop };
cfg_rep_t cfg_rep_string = { "string", free_string };
cfg_rep_t cfg_rep_boolean = { "boolean", free_noop };
cfg_rep_t cfg_rep_map = { "map", free_map };
cfg_rep_t cfg_rep_list = { "list", free_list };
cfg_rep_t cfg_rep_tuple = { "tuple", free_tuple };
cfg_rep_t cfg_rep_sockaddr = { "sockaddr", free_noop };
cfg_rep_t cfg_rep_netprefix = { "netprefix", free_noop };
cfg_rep_t cfg_rep_void = { "void", free_noop };

/*
 * Forward declarations of configuration type definitions.
 */

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static cfg_type_t cfg_type_boolean;
static cfg_type_t cfg_type_uint32;
static cfg_type_t cfg_type_qstring;
static cfg_type_t cfg_type_astring;
static cfg_type_t cfg_type_ustring;
static cfg_type_t cfg_type_optional_port;
static cfg_type_t cfg_type_bracketed_aml;
static cfg_type_t cfg_type_acl;
static cfg_type_t cfg_type_portiplist;
static cfg_type_t cfg_type_bracketed_sockaddrlist;
static cfg_type_t cfg_type_sockaddr;
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static cfg_type_t cfg_type_netaddr;
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static cfg_type_t cfg_type_optional_keyref;
static cfg_type_t cfg_type_options;
static cfg_type_t cfg_type_view;
static cfg_type_t cfg_type_viewopts;
static cfg_type_t cfg_type_key;
static cfg_type_t cfg_type_server;
static cfg_type_t cfg_type_controls;
static cfg_type_t cfg_type_bracketed_sockaddrkeylist;
static cfg_type_t cfg_type_querysource4;
static cfg_type_t cfg_type_querysource6;
static cfg_type_t cfg_type_querysource;
static cfg_type_t cfg_type_sockaddr4wild;
static cfg_type_t cfg_type_sockaddr6wild;
static cfg_type_t cfg_type_sockaddr;
static cfg_type_t cfg_type_netprefix;
static cfg_type_t cfg_type_zone;
static cfg_type_t cfg_type_zoneopts;
static cfg_type_t cfg_type_logging;
static cfg_type_t cfg_type_optional_facility;
static cfg_type_t cfg_type_void;
static cfg_type_t cfg_type_optional_class;
static cfg_type_t cfg_type_destinationlist;
static cfg_type_t cfg_type_size;
static cfg_type_t cfg_type_negated;
static cfg_type_t cfg_type_addrmatchelt;
static cfg_type_t cfg_type_unsupported;
static cfg_type_t cfg_type_token;
static cfg_type_t cfg_type_server_key_kludge;
static cfg_type_t cfg_type_optional_facility;
static cfg_type_t cfg_type_logseverity;
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static cfg_type_t cfg_type_logfile;
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static cfg_type_t cfg_type_lwres;
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static cfg_type_t cfg_type_controls_sockaddr;
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static cfg_type_t cfg_type_notifytype;
static cfg_type_t cfg_type_dialuptype;
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/*
 * Configuration type definitions.
 */

/* tkey-dhkey */

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static cfg_tuplefielddef_t tkey_dhkey_fields[] = {
	{ "name", &cfg_type_qstring, 0 },
	{ "keyid", &cfg_type_uint32, 0 },
	{ NULL, NULL, 0 }
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};

static cfg_type_t cfg_type_tkey_dhkey = {
	"tkey-dhkey", parse_tuple, print_tuple, &cfg_rep_tuple,
	tkey_dhkey_fields
};

/* listen-on */

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static cfg_tuplefielddef_t listenon_fields[] = {
	{ "port", &cfg_type_optional_port, 0 },
	{ "acl", &cfg_type_bracketed_aml, 0 },
	{ NULL, NULL, 0 }
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};
static cfg_type_t cfg_type_listenon = {
	"listenon", parse_tuple, print_tuple, &cfg_rep_tuple, listenon_fields };

/* acl */

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static cfg_tuplefielddef_t acl_fields[] = {
	{ "name", &cfg_type_astring, 0 },
	{ "value", &cfg_type_bracketed_aml, 0 },
	{ NULL, NULL, 0 }
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};

static cfg_type_t cfg_type_acl = {
	"acl", parse_tuple, print_tuple, &cfg_rep_tuple, acl_fields };


/*
 * "sockaddrkeylist", a list of socket addresses with optional keys
 * and an optional default port, as used in the masters option.
 * E.g.,
 *   "port 1234 { 10.0.0.1 key foo; 1::2 port 69; }"
 */

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static cfg_tuplefielddef_t sockaddrkey_fields[] = {
	{ "sockaddr", &cfg_type_sockaddr, 0 },
	{ "key", &cfg_type_optional_keyref, 0 },
	{ NULL, NULL, 0 },
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};

static cfg_type_t cfg_type_sockaddrkey = {
	"sockaddrkey", parse_tuple, print_tuple, &cfg_rep_tuple,
	sockaddrkey_fields
};

static cfg_type_t cfg_type_bracketed_sockaddrkeylist = {
	"bracketed_sockaddrkeylist", parse_bracketed_list,
	print_bracketed_list, &cfg_rep_list, &cfg_type_sockaddrkey
};

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static cfg_tuplefielddef_t sockaddrkeylist_fields[] = {
	{ "port", &cfg_type_optional_port, 0 },
	{ "addresses", &cfg_type_bracketed_sockaddrkeylist, 0 },
	{ NULL, NULL, 0 }
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};
static cfg_type_t cfg_type_sockaddrkeylist = {
	"sockaddrkeylist", parse_tuple, print_tuple, &cfg_rep_tuple,
	sockaddrkeylist_fields
};

/*
 * A list of socket addresses with an optional default port,
 * as used in the also-notify option.  E.g.,
 * "port 1234 { 10.0.0.1; 1::2 port 69; }"
 */
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static cfg_tuplefielddef_t portiplist_fields[] = {
	{ "port", &cfg_type_optional_port, 0 },
	{ "addresses", &cfg_type_bracketed_sockaddrlist, 0 },
	{ NULL, NULL, 0 }
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};
static cfg_type_t cfg_type_portiplist = {
	"portiplist", parse_tuple, print_tuple, &cfg_rep_tuple,
	portiplist_fields
};

/*
 * A public key, as in the "pubkey" statement.
 */
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static cfg_tuplefielddef_t pubkey_fields[] = {
	{ "flags", &cfg_type_uint32, 0 },
	{ "protocol", &cfg_type_uint32, 0 },
	{ "algorithm", &cfg_type_uint32, 0 },
	{ "key", &cfg_type_qstring, 0 },
	{ NULL, NULL, 0 }
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};
static cfg_type_t cfg_type_pubkey = {
	"pubkey", parse_tuple, print_tuple, &cfg_rep_tuple, pubkey_fields };


/*
 * A list of RR types, used in grant statements.
 * Note that the old parser allows quotes around the RR type names.
 */
static cfg_type_t cfg_type_rrtypelist = {
	"rrtypelist", parse_spacelist, print_spacelist, &cfg_rep_list,
	&cfg_type_astring
};

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const char *mode_enums[] = { "grant", "deny", NULL };
static cfg_type_t cfg_type_mode = {
	"mode", parse_enum, print_ustring, &cfg_rep_string,
	&mode_enums
};

const char *matchtype_enums[] = {
	"name", "subdomain", "wildcard", "self", NULL };
static cfg_type_t cfg_type_matchtype = {
	"matchtype", parse_enum, print_ustring, &cfg_rep_string,
	&matchtype_enums
};

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/*
 * A grant statement, used in the update policy.
 */
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static cfg_tuplefielddef_t grant_fields[] = {
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	{ "mode", &cfg_type_mode, 0 },
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	{ "identity", &cfg_type_astring, 0 }, /* domain name */ 
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	{ "matchtype", &cfg_type_matchtype, 0 },
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	{ "name", &cfg_type_astring, 0 }, /* domain name */
	{ "types", &cfg_type_rrtypelist, 0 },
	{ NULL, NULL, 0 }
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};
static cfg_type_t cfg_type_grant = {
	"grant", parse_tuple, print_tuple, &cfg_rep_tuple, grant_fields };

static cfg_type_t cfg_type_updatepolicy = {
	"updatepolicy", parse_bracketed_list, print_bracketed_list,
	&cfg_rep_list, &cfg_type_grant
};

/*
 * A view statement.
 */
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static cfg_tuplefielddef_t view_fields[] = {
	{ "name", &cfg_type_astring, 0 },
	{ "class", &cfg_type_optional_class, 0 },
	{ "options", &cfg_type_viewopts, 0 },
	{ NULL, NULL, 0 }
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};
static cfg_type_t cfg_type_view = {
	"view", parse_tuple, print_tuple, &cfg_rep_tuple, view_fields };

/*
 * A zone statement.
 */
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static cfg_tuplefielddef_t zone_fields[] = {
	{ "name", &cfg_type_astring, 0 },
	{ "class", &cfg_type_optional_class, 0 },
	{ "options", &cfg_type_zoneopts, 0 },
	{ NULL, NULL, 0 }
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};
static cfg_type_t cfg_type_zone = {
	"zone", parse_tuple, print_tuple, &cfg_rep_tuple, zone_fields };

/*
 * A "category" clause in the "logging" statement.
 */
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static cfg_tuplefielddef_t category_fields[] = {
	{ "name", &cfg_type_astring, 0 },
	{ "destinations", &cfg_type_destinationlist,0 },
	{ NULL, NULL, 0 }
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};
static cfg_type_t cfg_type_category = {
	"category", parse_tuple, print_tuple, &cfg_rep_tuple, category_fields };


/*
 * A trusted key, as used in the "trusted-keys" statement.
 */
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static cfg_tuplefielddef_t trustedkey_fields[] = {
	{ "name", &cfg_type_astring, 0 },
	{ "flags", &cfg_type_uint32, 0 },
	{ "protocol", &cfg_type_uint32, 0 },
	{ "algorithm", &cfg_type_uint32, 0 },
	{ "key", &cfg_type_qstring, 0 },
	{ NULL, NULL, 0 }
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};
static cfg_type_t cfg_type_trustedkey = {
	"trustedkey", parse_tuple, print_tuple, &cfg_rep_tuple,
	trustedkey_fields
};


static keyword_type_t wild_class_kw = { "class", &cfg_type_ustring };

static cfg_type_t cfg_type_optional_wild_class = {
	"optional_wild_class", parse_optional_keyvalue,
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	print_keyvalue, &cfg_rep_string, &wild_class_kw
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};

static keyword_type_t wild_type_kw = { "type", &cfg_type_ustring };

static cfg_type_t cfg_type_optional_wild_type = {
	"optional_wild_type", parse_optional_keyvalue,
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	print_keyvalue, &cfg_rep_string, &wild_type_kw
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};

static keyword_type_t wild_name_kw = { "name", &cfg_type_qstring };

static cfg_type_t cfg_type_optional_wild_name = {
	"optional_wild_name", parse_optional_keyvalue,
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	print_keyvalue, &cfg_rep_string, &wild_name_kw
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};

/*
 * An rrset ordering element.
 */
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static cfg_tuplefielddef_t rrsetorderingelement_fields[] = {
	{ "class", &cfg_type_optional_wild_class, 0 },
	{ "type", &cfg_type_optional_wild_type, 0 },
	{ "name", &cfg_type_optional_wild_name, 0 },
	{ "order", &cfg_type_ustring, 0 }, /* must be literal "order" */ 
	{ "ordering", &cfg_type_ustring, 0 },
	{ NULL, NULL, 0 }
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};
static cfg_type_t cfg_type_rrsetorderingelement = {
	"rrsetorderingelement", parse_tuple, print_tuple, &cfg_rep_tuple,
	rrsetorderingelement_fields
};

/*
 * A global or view "check-names" option.  Note that the zone
 * "check-names" option has a different syntax.
 */
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static cfg_tuplefielddef_t checknames_fields[] = {
	{ "type", &cfg_type_ustring, 0 },
	{ "mode", &cfg_type_ustring, 0 },
	{ NULL, NULL, 0 }
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};
static cfg_type_t cfg_type_checknames = {
	"checknames", parse_tuple, print_tuple, &cfg_rep_tuple,
	checknames_fields
};

static cfg_type_t cfg_type_bracketed_sockaddrlist = {
	"bracketed_sockaddrlist", parse_bracketed_list, print_bracketed_list,
	&cfg_rep_list, &cfg_type_sockaddr
};

static cfg_type_t cfg_type_rrsetorder = {
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	"rrsetorder", parse_bracketed_list, print_bracketed_list,
	&cfg_rep_list, &cfg_type_rrsetorderingelement
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};

static keyword_type_t port_kw = { "port", &cfg_type_uint32 };

static cfg_type_t cfg_type_optional_port = {
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	"optional_port", parse_optional_keyvalue, print_keyvalue,
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	&cfg_rep_uint32, &port_kw
};

/* A list of keys, as in the "key" clause of the controls statement. */
static cfg_type_t cfg_type_keylist = {
	"keylist", parse_bracketed_list, print_bracketed_list, &cfg_rep_list,
	&cfg_type_astring
};

static cfg_type_t cfg_type_trustedkeys = {
	"trusted-keys", parse_bracketed_list, print_bracketed_list, &cfg_rep_list,
	&cfg_type_trustedkey
};

/*
 * An implicit list.  These are formed by clauses that occur multiple times.
 */
static cfg_type_t cfg_type_implicitlist = {
	"implicitlist", NULL, print_list, &cfg_rep_list, NULL };

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const char *forwardtype_enums[] = { "first", "only", NULL };
static cfg_type_t cfg_type_forwardtype = {
	"forwardtype", parse_enum, print_ustring, &cfg_rep_string,
	&forwardtype_enums
};

const char *zonetype_enums[] = {
	"master", "slave", "stub", "hint", "forward", NULL };
static cfg_type_t cfg_type_zonetype = {
	"zonetype", parse_enum, print_ustring, &cfg_rep_string,
	&zonetype_enums
};

const char *loglevel_enums[] = {
	"critical", "error", "warning", "notice", "info", "dynamic", NULL };
static cfg_type_t cfg_type_loglevel = {
	"loglevel", parse_enum, print_ustring, &cfg_rep_string,
	&loglevel_enums
};

const char *transferformat_enums[] = { "many-answers", "one-answer", NULL };
static cfg_type_t cfg_type_transferformat = {
	"transferformat", parse_enum, print_ustring, &cfg_rep_string,
	&transferformat_enums
};

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/*
 * Clauses that can be found within the top level of the named.conf
 * file only.
 */
static cfg_clausedef_t
namedconf_clauses[] = {
	{ "options", &cfg_type_options, 0 },
	{ "controls", &cfg_type_controls, CFG_CLAUSEFLAG_MULTI },
	{ "acl", &cfg_type_acl, CFG_CLAUSEFLAG_MULTI },
	{ "logging", &cfg_type_logging, 0 },
	{ "view", &cfg_type_view, CFG_CLAUSEFLAG_MULTI },
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	{ "lwres", &cfg_type_lwres, CFG_CLAUSEFLAG_MULTI },
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	{ NULL, NULL, 0 }
};

/*
 * Clauses that can occur at the top level or in the view
 * statement, but not in the options block.
 */
static cfg_clausedef_t
namedconf_or_view_clauses[] = {
	{ "key", &cfg_type_key, CFG_CLAUSEFLAG_MULTI },
	{ "zone", &cfg_type_zone, CFG_CLAUSEFLAG_MULTI },
	{ "server", &cfg_type_server, CFG_CLAUSEFLAG_MULTI },
	{ "trusted-keys", &cfg_type_trustedkeys, CFG_CLAUSEFLAG_MULTI },
	{ NULL, NULL, 0 }
};

/*
 * Clauses that can be found within the 'options' statement.
 */
static cfg_clausedef_t
options_clauses[] = {
	{ "blackhole", &cfg_type_bracketed_aml, 0 },
	{ "coresize", &cfg_type_size, 0 },
	{ "datasize", &cfg_type_size, 0 },
	{ "deallocate-on-exit", &cfg_type_boolean, CFG_CLAUSEFLAG_OBSOLETE },
	{ "directory", &cfg_type_qstring, 0 },
	{ "dump-file", &cfg_type_qstring, 0 },
	{ "fake-iquery", &cfg_type_boolean, CFG_CLAUSEFLAG_OBSOLETE },
	{ "files", &cfg_type_size, 0 },
	{ "has-old-clients", &cfg_type_boolean, CFG_CLAUSEFLAG_OBSOLETE },
	{ "heartbeat-interval", &cfg_type_uint32, 0 },
	{ "host-statistics", &cfg_type_boolean, 0 },
	{ "interface-interval", &cfg_type_uint32, 0 },
	{ "listen-on", &cfg_type_listenon, CFG_CLAUSEFLAG_MULTI },
	{ "listen-on-v6", &cfg_type_listenon, CFG_CLAUSEFLAG_MULTI },
	{ "memstatistics-file", &cfg_type_qstring, 0 },
	{ "multiple-cnames", &cfg_type_boolean, CFG_CLAUSEFLAG_OBSOLETE },
	{ "named-xfer", &cfg_type_qstring, CFG_CLAUSEFLAG_OBSOLETE },
	{ "pid-file", &cfg_type_qstring, 0 },
	{ "port", &cfg_type_uint32, 0 },
	{ "random-device", &cfg_type_qstring, 0 },
	{ "recursive-clients", &cfg_type_uint32, 0 },
	{ "rrset-order", &cfg_type_rrsetorder, 0 },
	{ "serial-queries", &cfg_type_uint32, CFG_CLAUSEFLAG_OBSOLETE },
	{ "stacksize", &cfg_type_size, 0 },
	{ "statistics-file", &cfg_type_qstring, 0 },
	{ "statistics-interval", &cfg_type_uint32, CFG_CLAUSEFLAG_NYI },
	{ "tcp-clients", &cfg_type_uint32, 0 },
	{ "tkey-dhkey", &cfg_type_tkey_dhkey, 0 },
	{ "tkey-gssapi-credential", &cfg_type_qstring, 0 },
	{ "tkey-domain", &cfg_type_qstring, 0 },
	{ "transfers-per-ns", &cfg_type_uint32, 0 },
	{ "transfers-in", &cfg_type_uint32, 0 },
	{ "transfers-out", &cfg_type_uint32, 0 },
	{ "treat-cr-as-space", &cfg_type_boolean, CFG_CLAUSEFLAG_OBSOLETE },
	{ "use-id-pool", &cfg_type_boolean, CFG_CLAUSEFLAG_OBSOLETE },
	{ "use-ixfr", &cfg_type_boolean, 0 },
	{ "version", &cfg_type_qstring, 0 },
	{ NULL, NULL, 0 }
};

/*
 * Clauses that can be found within the 'view' statement,
 * with defaults in the 'options' statement.
 */

static cfg_clausedef_t
view_clauses[] = {
	{ "allow-notify", &cfg_type_bracketed_aml, 0 },
	{ "allow-update-forwarding", &cfg_type_bracketed_aml, 0 },
	{ "allow-recursion", &cfg_type_bracketed_aml, 0 },
	{ "allow-v6-synthesis", &cfg_type_bracketed_aml, 0 },
	{ "sortlist", &cfg_type_bracketed_aml, 0 },
	{ "topology", &cfg_type_bracketed_aml, CFG_CLAUSEFLAG_NOTIMP },
	{ "auth-nxdomain", &cfg_type_boolean, CFG_CLAUSEFLAG_NEWDEFAULT },
	{ "recursion", &cfg_type_boolean, 0 },
	{ "provide-ixfr", &cfg_type_boolean, 0 },
	{ "request-ixfr", &cfg_type_boolean, 0 },
	{ "fetch-glue", &cfg_type_boolean, CFG_CLAUSEFLAG_OBSOLETE },
	{ "rfc2308-type1", &cfg_type_boolean, CFG_CLAUSEFLAG_NYI },
	{ "additional-from-auth", &cfg_type_boolean, 0 },
	{ "additional-from-cache", &cfg_type_boolean, 0 },
	/*
	 * Note that the query-source option syntax is different
	 * from the other -source options.
	 */
	{ "query-source", &cfg_type_querysource4, 0 },
	{ "query-source-v6", &cfg_type_querysource6, 0 },
	{ "notify-source", &cfg_type_sockaddr4wild, 0 },
	{ "notify-source-v6", &cfg_type_sockaddr6wild, 0 },
	{ "cleaning-interval", &cfg_type_uint32, 0 },
	{ "min-roots", &cfg_type_uint32, CFG_CLAUSEFLAG_NOTIMP },
	{ "lame-ttl", &cfg_type_uint32, 0 },
	{ "max-ncache-ttl", &cfg_type_uint32, 0 },
	{ "max-cache-ttl", &cfg_type_uint32, 0 },
	{ "transfer-format", &cfg_type_ustring, 0 },
	/*
	 * XXX "default" should not be accepted as a size in
	 * max-cache-size.
	 */
	{ "max-cache-size", &cfg_type_size, 0 },
	{ "check-names", &cfg_type_checknames,
	  CFG_CLAUSEFLAG_MULTI | CFG_CLAUSEFLAG_NOTIMP },
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	{ "cache-file", &cfg_type_qstring, 0 },
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	{ NULL, NULL, 0 }
};

/*
 * Clauses that can be found within the 'view' statement only.
 */
static cfg_clausedef_t
view_only_clauses[] = {
	{ "match-clients", &cfg_type_bracketed_aml, 0 },
	{ NULL, NULL, 0 }
};

/*
 * Clauses that can be found in a 'zone' statement,
 * with defaults in the 'view' or 'options' statement.
 */
static cfg_clausedef_t
zone_clauses[] = {
	{ "allow-query", &cfg_type_bracketed_aml, 0 },
	{ "allow-transfer", &cfg_type_bracketed_aml, 0 },
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	{ "notify", &cfg_type_notifytype, 0 },
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	{ "also-notify", &cfg_type_portiplist, 0 },
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	{ "dialup", &cfg_type_dialuptype, 0 },
	{ "forward", &cfg_type_forwardtype, 0 },
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	{ "forwarders", &cfg_type_portiplist, 0 },
	{ "maintain-ixfr-base", &cfg_type_boolean, 0 },
	{ "max-ixfr-log-size", &cfg_type_size, CFG_CLAUSEFLAG_OBSOLETE },
	{ "transfer-source", &cfg_type_sockaddr4wild, 0 },
	{ "transfer-source-v6", &cfg_type_sockaddr6wild, 0 },
	{ "max-transfer-time-in", &cfg_type_uint32, 0 },
	{ "max-transfer-time-out", &cfg_type_uint32, 0 },
	{ "max-transfer-idle-in", &cfg_type_uint32, 0 },
	{ "max-transfer-idle-out", &cfg_type_uint32, 0 },
	{ "max-retry-time", &cfg_type_uint32, 0 },
	{ "min-retry-time", &cfg_type_uint32, 0 },
	{ "max-refresh-time", &cfg_type_uint32, 0 },
	{ "min-refresh-time", &cfg_type_uint32, 0 },
	{ "sig-validity-interval", &cfg_type_uint32, 0 },
	{ "zone-statistics", &cfg_type_boolean, 0 },
	{ NULL, NULL, 0 }
};

/*
 * Clauses that can be found in a 'zone' statement
 * only.
 */
static cfg_clausedef_t
zone_only_clauses[] = {
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	{ "type", &cfg_type_zonetype, 0 },
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	{ "allow-update", &cfg_type_bracketed_aml, 0 },
	{ "allow-update-forwarding", &cfg_type_bracketed_aml, 0 },
	{ "file", &cfg_type_qstring, 0 },
	{ "ixfr-base", &cfg_type_qstring, CFG_CLAUSEFLAG_OBSOLETE },
	{ "ixfr-tmp-file", &cfg_type_qstring, CFG_CLAUSEFLAG_OBSOLETE },
	{ "masters", &cfg_type_sockaddrkeylist, 0 },
	{ "pubkey", &cfg_type_pubkey,
	  CFG_CLAUSEFLAG_MULTI | CFG_CLAUSEFLAG_OBSOLETE },
	{ "update-policy", &cfg_type_updatepolicy, 0 },
	{ "database", &cfg_type_astring, 0 },
	/*
	 * Note that the format of the check-names option is different between
	 * the zone options and the global/view options.  Ugh.
	 */
	{ "check-names", &cfg_type_ustring, CFG_CLAUSEFLAG_NOTIMP },
	{ NULL, NULL, 0 }
};

static cfg_clausedef_t *
namedconf_clausesets[] = {
	namedconf_clauses,
	namedconf_or_view_clauses,
	NULL
};

cfg_type_t cfg_type_namedconf = {
	"namedconf", parse_mapbody, print_mapbody, &cfg_rep_map,
	namedconf_clausesets
};

static cfg_clausedef_t *
options_clausesets[] = {
	options_clauses,
	view_clauses,
	zone_clauses,
	NULL
};
static cfg_type_t cfg_type_options = {
	"options", parse_map, print_map, &cfg_rep_map, options_clausesets };

static cfg_clausedef_t *
view_clausesets[] = {
	view_only_clauses,
	namedconf_or_view_clauses,
	view_clauses,
	zone_clauses,
	NULL
};
static cfg_type_t cfg_type_viewopts = {
	"view", parse_map, print_map, &cfg_rep_map, view_clausesets };

static cfg_clausedef_t *
zone_clausesets[] = {
	zone_only_clauses,
	zone_clauses,
	NULL
};
static cfg_type_t cfg_type_zoneopts = {
	"zoneopts", parse_map, print_map, &cfg_rep_map, zone_clausesets };

/*
 * Clauses that can be found within the 'key' statement.
 */
static cfg_clausedef_t
key_clauses[] = {
	{ "algorithm", &cfg_type_astring, 0 },
	{ "secret", &cfg_type_astring, 0 },
	{ NULL, NULL, 0 }
};

static cfg_clausedef_t *
key_clausesets[] = {
	key_clauses,
	NULL
};
static cfg_type_t cfg_type_key = {
	"key", parse_named_map, print_map, &cfg_rep_map, key_clausesets };


/*
 * Clauses that can be found in a 'server' statement.
 */
static cfg_clausedef_t
server_clauses[] = {
	{ "bogus", &cfg_type_boolean, 0 },
	{ "provide-ixfr", &cfg_type_boolean, 0 },
	{ "request-ixfr", &cfg_type_boolean, 0 },
	{ "transfers", &cfg_type_uint32, 0 },
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	{ "transfer-format", &cfg_type_transferformat, 0 },
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	{ "keys", &cfg_type_server_key_kludge, 0 },
	{ NULL, NULL, 0 }
};
static cfg_clausedef_t *
server_clausesets[] = {
	server_clauses,
	NULL
};
static cfg_type_t cfg_type_server = {
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	"server", parse_addressed_map, print_map, &cfg_rep_map,
	server_clausesets
};
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/*
 * Clauses that can be found in a 'channel' clause in the
 * 'logging' statement.
 *
 * These have some additional constraints that need to be
 * checked after parsing:
 *  - There must exactly one of file/syslog/null/stderr
 *
 */
static cfg_clausedef_t
channel_clauses[] = {
	/* Destinations.  We no longer require these to be first. */
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	{ "file", &cfg_type_logfile, 0 },
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	{ "syslog", &cfg_type_optional_facility, 0 },
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	{ "null", &cfg_type_void, 0 },
	{ "stderr", &cfg_type_void, 0 },
	/* Options.  We now accept these for the null channel, too. */
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	{ "severity", &cfg_type_logseverity, 0 },
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	{ "print-time", &cfg_type_boolean, 0 },
	{ "print-severity", &cfg_type_boolean, 0 },
	{ "print-category", &cfg_type_boolean, 0 },
	{ NULL, NULL, 0 }
};
static cfg_clausedef_t *
channel_clausesets[] = {
	channel_clauses,
	NULL
};
static cfg_type_t cfg_type_channel = {
	"channel", parse_named_map, print_map, &cfg_rep_map, channel_clausesets };

/* A list of log destination, used in the "category" clause. */
static cfg_type_t cfg_type_destinationlist = {
	"destinationlist", parse_bracketed_list, print_bracketed_list,
	&cfg_rep_list, &cfg_type_astring };

/*
 * Clauses that can be found in a 'logging' statement.
 */
static cfg_clausedef_t
logging_clauses[] = {
	{ "channel", &cfg_type_channel, CFG_CLAUSEFLAG_MULTI },
	{ "category", &cfg_type_category, CFG_CLAUSEFLAG_MULTI },
	{ NULL, NULL, 0 }
};
static cfg_clausedef_t *
logging_clausesets[] = {
	logging_clauses,
	NULL
};
static cfg_type_t cfg_type_logging = {
	"logging", parse_map, print_map, &cfg_rep_map, logging_clausesets };


/* Functions. */

static void
print_obj(cfg_printer_t *pctx, cfg_obj_t *obj) {
	obj->type->print(pctx, obj);
}

static void
print(cfg_printer_t *pctx, const char *text, int len) {
	pctx->f(pctx->closure, text, len);
}

static void
print_open(cfg_printer_t *pctx) {
	print(pctx, "{\n", 2);
	pctx->indent++;
}

static void
print_indent(cfg_printer_t *pctx) {
	int indent = pctx->indent;
	while (indent > 0) {
		print(pctx, "\t", 1);
		indent--;
	}
}

static void
print_close(cfg_printer_t *pctx) {
	pctx->indent--;
	print_indent(pctx);
	print(pctx, "}", 1);
}

static isc_result_t
parse(cfg_parser_t *pctx, cfg_type_t *type, cfg_obj_t **ret) {
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	isc_result_t result;
	INSIST(ret != NULL && *ret == NULL);
	result = type->parse(pctx, type, ret);
	if (result != ISC_R_SUCCESS)
		return (result);
	INSIST(*ret != NULL);
	return (ISC_R_SUCCESS);
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}

void
cfg_print(cfg_obj_t *obj,
	  void (*f)(void *closure, const char *text, int textlen),
	  void *closure)
{
	cfg_printer_t pctx;
	pctx.f = f;
	pctx.closure = closure;
	pctx.indent = 0;
	obj->type->print(&pctx, obj);
}

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/* Tuples. */
  
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static isc_result_t
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create_tuple(cfg_parser_t *pctx, cfg_type_t *type, cfg_obj_t **ret) {
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	isc_result_t result;
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	cfg_tuplefielddef_t *fields = type->of;
	cfg_tuplefielddef_t *f;
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	cfg_obj_t *obj = NULL;
	unsigned int nfields = 0;
	int i;
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	for (f = fields; f->name != NULL; f++)
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		nfields++;

	CHECK(create_cfgobj(pctx, type, &obj));
	obj->value.tuple = isc_mem_get(pctx->mctx,
				       nfields * sizeof(cfg_obj_t *));
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	if (obj->value.tuple == NULL) {
		result = ISC_R_NOMEMORY;
		goto cleanup;
	}
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	for (f = fields, i = 0; f->name != NULL; f++, i++)
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		obj->value.tuple[i] = NULL;
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	*ret = obj;
	return (ISC_R_SUCCESS);

 cleanup:
	CLEANUP_OBJ(obj);
	return (result);
}

static isc_result_t
parse_tuple(cfg_parser_t *pctx, cfg_type_t *type, cfg_obj_t **ret)
{
	isc_result_t result;
	cfg_tuplefielddef_t *fields = type->of;
	cfg_tuplefielddef_t *f;
	cfg_obj_t *obj = NULL;
	unsigned int i;
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	CHECK(create_tuple(pctx, type, &obj));
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	for (f = fields, i = 0; f->name != NULL; f++, i++)
		CHECK(parse(pctx, f->type, &obj->value.tuple[i]));
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	*ret = obj;
	return (ISC_R_SUCCESS);

 cleanup:
	CLEANUP_OBJ(obj);
	return (result);
}

static void
print_tuple(cfg_printer_t *pctx, cfg_obj_t *obj) {
	unsigned int i;
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	cfg_tuplefielddef_t *fields = obj->type->of;
	cfg_tuplefielddef_t *f;
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	isc_boolean_t need_space = ISC_FALSE;
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	for (f = fields, i = 0; f->name != NULL; f++, i++) {
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		cfg_obj_t *fieldobj = obj->value.tuple[i];
		if (need_space)
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			print(pctx, " ", 1);
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		print_obj(pctx, fieldobj);
		need_space = ISC_TF(fieldobj->type->print != print_void);
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	}
}

static void
free_tuple(cfg_parser_t *pctx, cfg_obj_t *obj) {
	unsigned int i;
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	cfg_tuplefielddef_t *fields = obj->type->of;
	cfg_tuplefielddef_t *f;
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	unsigned int nfields = 0;

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	if (obj->value.tuple == NULL)
		return;

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	for (f = fields, i = 0; f->name != NULL; f++, i++) {
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		CLEANUP_OBJ(obj->value.tuple[i]);
		nfields++;
	}
	isc_mem_put(pctx->mctx, obj->value.tuple,
		    nfields * sizeof(cfg_obj_t *));
}

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isc_boolean_t
cfg_obj_istuple(cfg_obj_t *obj) {
	REQUIRE(obj != NULL);
	return (ISC_TF(obj->type->rep == &cfg_rep_tuple));
}

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cfg_obj_t *
cfg_tuple_get(cfg_obj_t *tupleobj, const char* name) {
	unsigned int i;
	cfg_tuplefielddef_t *fields;
	cfg_tuplefielddef_t *f;
	
	REQUIRE(tupleobj != NULL && tupleobj->type->rep == &cfg_rep_tuple);

	fields = tupleobj->type->of;
	for (f = fields, i = 0; f->name != NULL; f++, i++) {
		if (strcmp(f->name, name) == 0)
			return (tupleobj->value.tuple[i]);
	}
	INSIST(0);
	return (NULL);
}

/*
 * Parse a required special character.
 */
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static isc_result_t
parse_special(cfg_parser_t *pctx, int special) {
        isc_result_t result;
	CHECK(cfg_gettoken(pctx, 0));
	if (pctx->token.type == isc_tokentype_special &&
	    pctx->token.value.as_char == special)
		return (ISC_R_SUCCESS);

	parser_error(pctx, LOG_NEAR, "'%c' expected", special);
	return (ISC_R_UNEXPECTEDTOKEN);
 cleanup:
	return (result);
}

/*
 * Parse a required semicolon.  If it is not there, log
 * an error and increment the error count but continue
 * parsing.  Since the next token is pushed back,
 * care must be taken to make sure it is eventually
 * consumed or an infinite loop may result.
 */
static isc_result_t
parse_semicolon(cfg_parser_t *pctx) {
        isc_result_t result;
	CHECK(cfg_gettoken(pctx, 0));
	if (pctx->token.type == isc_tokentype_special &&
	    pctx->token.value.as_char == ';')
		return (ISC_R_SUCCESS);

	parser_error(pctx, LOG_BEFORE, "missing ';'");
	cfg_ungettoken(pctx);
 cleanup:
	return (result);
}

/*
 * Parse EOF, logging and returning an error if not there.
 */
static isc_result_t
parse_eof(cfg_parser_t *pctx) {
        isc_result_t result;
	CHECK(cfg_gettoken(pctx, 0));

	if (pctx->token.type == isc_tokentype_eof)
		return (ISC_R_SUCCESS);

	parser_error(pctx, LOG_NEAR, "syntax error");
	return (ISC_R_UNEXPECTEDTOKEN);
 cleanup:
	return(result);
}

/* A list of files, used internally for pctx->files. */
static cfg_type_t cfg_type_filelist = {
	"filelist", NULL, print_list, &cfg_rep_list,
	&cfg_type_qstring
};

isc_result_t
cfg_parser_create(isc_mem_t *mctx, isc_log_t *lctx, cfg_parser_t **ret)
{
	isc_result_t result;
	cfg_parser_t *pctx;
	isc_lexspecials_t specials;

	REQUIRE(mctx != NULL);
	REQUIRE(ret != NULL && *ret == NULL);

	pctx = isc_mem_get(mctx, sizeof(*pctx));
	if (pctx == NULL)
		return (ISC_R_NOMEMORY);

	pctx->mctx = mctx;
	pctx->lctx = lctx;
	pctx->lexer = NULL;
	pctx->seen_eof = ISC_FALSE;
	pctx->ungotten = ISC_FALSE;
	pctx->errors = 0;
	pctx->files = 0;
	pctx->line = 0;
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	pctx->callback = NULL;
	pctx->callbackarg = NULL;
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	memset(specials, 0, sizeof(specials));
	specials['{'] = 1;
	specials['}'] = 1;
	specials[';'] = 1;
	specials['/'] = 1;
	specials['"'] = 1;
	specials['!'] = 1;

	CHECK(isc_lex_create(pctx->mctx, 1024, &pctx->lexer));

	isc_lex_setspecials(pctx->lexer, specials);
	isc_lex_setcomments(pctx->lexer, (ISC_LEXCOMMENT_C |
					 ISC_LEXCOMMENT_CPLUSPLUS |
					 ISC_LEXCOMMENT_SHELL));

	CHECK(create_list(pctx, &cfg_type_filelist, &pctx->files));

	*ret = pctx;
	return (ISC_R_SUCCESS);

 cleanup:
	if (pctx->lexer != NULL)
		isc_lex_destroy(&pctx->lexer);
	CLEANUP_OBJ(pctx->files);
	isc_mem_put(mctx, pctx, sizeof(*pctx));
	return (result);
}

static isc_result_t
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parser_openfile(cfg_parser_t *pctx, const char *filename) {
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	isc_result_t result;
	cfg_listelt_t *elt = NULL;
	cfg_obj_t *stringobj = NULL;

	result = isc_lex_openfile(pctx->lexer, filename);
	if (result != ISC_R_SUCCESS) {
		parser_error(pctx, 0, "open: %s: %s",
			     filename, isc_result_totext(result));
		goto cleanup;
	}

	CHECK(create_string(pctx, filename, &cfg_type_qstring, &stringobj));
	CHECK(create_listelt(pctx, &elt));
	elt->obj = stringobj;
	ISC_LIST_APPEND(pctx->files->value.list, elt, link);

	return (ISC_R_SUCCESS);
 cleanup:
	CLEANUP_OBJ(stringobj);
	return (result);
}

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void
cfg_parser_setcallback(cfg_parser_t *pctx,
		       cfg_parsecallback_t callback,
		       void *arg)
{
	pctx->callback = callback;
	pctx->callbackarg = arg;
}

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/*
 * Parse a configuration using a pctx where a lexer has already
 * been set up with a source.
 */
static isc_result_t
parse2(cfg_parser_t *pctx, cfg_type_t *type, cfg_obj_t **ret) {
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	isc_result_t result;
	cfg_obj_t *obj = NULL;

	result = parse(pctx, type, &obj);

	if (pctx->errors != 0) {
		/* Errors have been logged. */
		if (result == ISC_R_SUCCESS)
			result = ISC_R_FAILURE;
		goto cleanup;
	}

	if (result != ISC_R_SUCCESS) {
		/* Parsing failed but no errors have been logged. */
		parser_error(pctx, 0, "parsing failed");
		goto cleanup;
	}

	CHECK(parse_eof(pctx));

	*ret = obj;
	return (ISC_R_SUCCESS);

 cleanup:
	CLEANUP_OBJ(obj);
	return (result);
}

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isc_result_t
cfg_parse_file(cfg_parser_t *pctx, const char *filename,
	       cfg_type_t *type, cfg_obj_t **ret)
{
	isc_result_t result;

	REQUIRE(filename != NULL);

	CHECK(parser_openfile(pctx, filename));
	CHECK(parse2(pctx, type, ret));
 cleanup:
	return (result);
}


isc_result_t
cfg_parse_buffer(cfg_parser_t *pctx, isc_buffer_t *buffer,
	cfg_type_t *type, cfg_obj_t **ret)
{
	isc_result_t result;
	REQUIRE(buffer != NULL);
	CHECK(isc_lex_openbuffer(pctx->lexer, buffer));	
	CHECK(parse2(pctx, type, ret));
 cleanup:
	return (result);
}

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void
cfg_parser_destroy(cfg_parser_t **pctxp) {
	cfg_parser_t *pctx = *pctxp;
	isc_lex_destroy(&pctx->lexer);
	CLEANUP_OBJ(pctx->files);
	isc_mem_put(pctx->mctx, pctx, sizeof(*pctx));
	*pctxp = NULL;
}

/*
 * void
 */
static isc_result_t
parse_void(cfg_parser_t *pctx, cfg_type_t *type, cfg_obj_t **ret) {
	UNUSED(type);
	return (create_cfgobj(pctx, &cfg_type_void, ret));
}

static void
print_void(cfg_printer_t *pctx, cfg_obj_t *obj) {
	UNUSED(pctx);
	UNUSED(obj);
}
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isc_boolean_t
cfg_obj_isvoid(cfg_obj_t *obj) {
	REQUIRE(obj != NULL);
	return (ISC_TF(obj->type->rep == &cfg_rep_void));
}

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static cfg_type_t cfg_type_void = {
	"void", parse_void, print_void, &cfg_rep_void, NULL };


/*
 * uint32
 */
static isc_result_t
parse_uint32(cfg_parser_t *pctx, cfg_type_t *type, cfg_obj_t **ret) {
        isc_result_t result;
	cfg_obj_t *obj = NULL;
	UNUSED(type);

	result = cfg_gettoken(pctx,
			      ISC_LEXOPT_NUMBER | ISC_LEXOPT_CNUMBER);
	if (result != ISC_R_SUCCESS)
		return (result);

	if (pctx->token.type != isc_tokentype_number) {
		parser_error(pctx, LOG_NEAR,
			     "number expected");
		return (ISC_R_UNEXPECTEDTOKEN);
	}

	CHECK(create_cfgobj(pctx, &cfg_type_uint32, &obj));

	obj->value.uint32 = pctx->token.value.as_ulong;
	*ret = obj;
 cleanup:
	return (result);
}

static void
print_uint(cfg_printer_t *pctx, unsigned int u) {
	char buf[32];
	sprintf(buf, "%u", u);
	print(pctx, buf, strlen(buf));
}

static void
print_uint32(cfg_printer_t *pctx, cfg_obj_t *obj) {
	print_uint(pctx, obj->value.uint32);
}

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isc_boolean_t
cfg_obj_isuint32(cfg_obj_t *obj) {
	REQUIRE(obj != NULL);
	return (ISC_TF(obj->type->rep == &cfg_rep_uint32));
}

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isc_uint32_t
cfg_obj_asuint32(cfg_obj_t *obj) {
	REQUIRE(obj != NULL && obj->type->rep == &cfg_rep_uint32);
	return (obj->value.uint32);
}

static cfg_type_t cfg_type_uint32 = {
	"uint32", parse_uint32, print_uint32, &cfg_rep_uint32, NULL };


/*
 * optional_keyvalue
 */
static isc_result_t
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parse_maybe_optional_keyvalue(cfg_parser_t *pctx, cfg_type_t *type,
			      isc_boolean_t optional, cfg_obj_t **ret)
{
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        isc_result_t result;
	cfg_obj_t *obj = NULL;
	keyword_type_t *kw = type->of;

	CHECK(cfg_peektoken(pctx, 0));
	if (pctx->token.type == isc_tokentype_string &&
	    strcasecmp(pctx->token.value.as_pointer, kw->name) == 0) {
		CHECK(cfg_gettoken(pctx, 0));
		CHECK(kw->type->parse(pctx, kw->type, &obj));
		obj->type = type; /* XXX kludge */
	} else {
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		if (optional) {
			CHECK(parse_void(pctx, NULL, &obj));
		} else {
			parser_error(pctx, LOG_NEAR, "expected '%s'",
				     kw->name);
			result = ISC_R_UNEXPECTEDTOKEN;
			goto cleanup;
		}
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	}
	*ret = obj;
 cleanup:
	return (result);
}

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static isc_result_t
parse_keyvalue(cfg_parser_t *pctx, cfg_type_t *type, cfg_obj_t **ret) {
	return (parse_maybe_optional_keyvalue(pctx, type, ISC_FALSE, ret));
}

static isc_result_t
parse_optional_keyvalue(cfg_parser_t *pctx, cfg_type_t *type, cfg_obj_t **ret) {
	return (parse_maybe_optional_keyvalue(pctx, type, ISC_TRUE, ret));
}

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static void
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print_keyvalue(cfg_printer_t *pctx, cfg_obj_t *obj) {
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	keyword_type_t *kw = obj->type->of;
	print(pctx, kw->name, strlen(kw->name));
	print(pctx, " ", 1);
	kw->type->print(pctx, obj);
}

/*
 * qstring, ustring, astring
 */

/* Create a string object from a null-terminated C string. */
static isc_result_t
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create_string(cfg_parser_t *pctx, const char *contents, cfg_type_t *type,
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	      cfg_obj_t **ret)
{
	isc_result_t result;
	cfg_obj_t *obj = NULL;
	int len;

	CHECK(create_cfgobj(pctx, type, &obj));
	len = strlen(contents);
	obj->value.string.length = len;
	obj->value.string.base = isc_mem_get(pctx->mctx, len + 1);
	if (obj->value.string.base == 0) {
		CLEANUP_OBJ(obj);
		return (ISC_R_NOMEMORY);
	}
	memcpy(obj->value.string.base, contents, len);
	obj->value.string.base[len] = '\0';

	*ret = obj;
 cleanup:
	return (result);
}

static isc_result_t
parse_qstring(cfg_parser_t *pctx, cfg_type_t *type, cfg_obj_t **ret) {
        isc_result_t result;
	UNUSED(type);

	CHECK(cfg_gettoken(pctx, ISC_LEXOPT_QSTRING));
	if (pctx->token.type != isc_tokentype_qstring) {
		parser_error(pctx, LOG_NEAR, "expected quoted string");
		return (ISC_R_UNEXPECTEDTOKEN);
	}
	return (create_string(pctx,
			      pctx->token.value.as_pointer,
			      &cfg_type_qstring,
			      ret));
 cleanup:
	return (result);
}

static isc_result_t
parse_ustring(cfg_parser_t *pctx, cfg_type_t *type, cfg_obj_t **ret) {
        isc_result_t result;
	UNUSED(type);

	CHECK(cfg_gettoken(pctx, 0));
	if (pctx->token.type != isc_tokentype_string) {
		parser_error(pctx, LOG_NEAR, "expected unquoted string");
		return (ISC_R_UNEXPECTEDTOKEN);
	}
	return (create_string(pctx,
			      pctx->token.value.as_pointer,
			      &cfg_type_ustring,
			      ret));
 cleanup:
	return (result);
}

static isc_result_t
parse_astring(cfg_parser_t *pctx, cfg_type_t *type, cfg_obj_t **ret) {
        isc_result_t result;
	UNUSED(type);

	CHECK(cfg_getstringtoken(pctx));
	return (create_string(pctx,
			      pctx->token.value.as_pointer,
			      &cfg_type_qstring,
			      ret));
 cleanup:
	return (result);
}

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static isc_boolean_t
is_enum(const char *s, const char **enums) {
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	const char **p;
	for (p = enums; *p != NULL; p++) {
		if (strcasecmp(*p, s) == 0)
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			return (ISC_TRUE);
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	}
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	return (ISC_FALSE);
}

static isc_result_t
check_enum(cfg_parser_t *pctx, cfg_obj_t *obj, const char **enums) {
	const char *s = obj->value.string.base;
	if (is_enum(s, enums))
		return (ISC_R_SUCCESS);
	parser_error(pctx, LOG_NEAR, "'%s' unexpected", s);
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	return (ISC_R_UNEXPECTEDTOKEN);
}

static isc_result_t
parse_enum(cfg_parser_t *pctx, cfg_type_t *type, cfg_obj_t **ret) {
        isc_result_t result;
	cfg_obj_t *obj = NULL;
	CHECK(parse_ustring(pctx, NULL, &obj));
	CHECK(check_enum(pctx, obj, type->of));
	*ret = obj;
	return (ISC_R_SUCCESS);
 cleanup:
	CLEANUP_OBJ(obj);	
	return (result);
}

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static isc_result_t
parse_enum_or_other(cfg_parser_t *pctx, cfg_type_t *enumtype,
		    cfg_type_t *othertype, cfg_obj_t **ret)
{
        isc_result_t result;
	CHECK(cfg_peektoken(pctx, 0));
	if (pctx->token.type == isc_tokentype_string &&
	    is_enum(pctx->token.value.as_pointer, enumtype->of)) {
		CHECK(parse_enum(pctx, enumtype, ret));
	} else {
		CHECK(parse(pctx, othertype, ret));
	}
 cleanup:
	return (result);
}


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/*
 * Print a string object.
 */
static void
print_ustring(cfg_printer_t *pctx, cfg_obj_t *obj) {
	print(pctx, obj->value.string.base, obj->value.string.length);
}

static void
print_qstring(cfg_printer_t *pctx, cfg_obj_t *obj) {
	print(pctx, "\"", 1);
	print_ustring(pctx, obj);
	print(pctx, "\"", 1);
}

static void
free_string(cfg_parser_t *pctx, cfg_obj_t *obj) {
	isc_mem_put(pctx->mctx, obj->value.string.base,
		    obj->value.string.length + 1);
}

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isc_boolean_t
cfg_obj_isstring(cfg_obj_t *obj) {
	REQUIRE(obj != NULL);
	return (ISC_TF(obj->type->rep == &cfg_rep_string));
}

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char *
cfg_obj_asstring(cfg_obj_t *obj) {
	REQUIRE(obj != NULL && obj->type->rep == &cfg_rep_string);
	return (obj->value.string.base);
}

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isc_boolean_t
cfg_obj_isboolean(cfg_obj_t *obj) {
	REQUIRE(obj != NULL);
	return (ISC_TF(obj->type->rep == &cfg_rep_boolean));
}

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isc_boolean_t
cfg_obj_asboolean(cfg_obj_t *obj) {
	REQUIRE(obj != NULL && obj->type->rep == &cfg_rep_boolean);
	return (obj->value.boolean);
}

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/* Quoted string only */
static cfg_type_t cfg_type_qstring = {
	"qstring", parse_qstring, print_qstring, &cfg_rep_string, NULL };

/* Unquoted string only */
static cfg_type_t cfg_type_ustring = {
	"string", parse_ustring, print_ustring, &cfg_rep_string, NULL };

/* Any string (quoted or unquoted); printed with quotes */
static cfg_type_t cfg_type_astring = {
	"string", parse_astring, print_qstring, &cfg_rep_string, NULL };

/*
 * A size, used by resource limits, log files sizes, etc.
 * Returned as a string and parsed by the caller.
 */
static cfg_type_t cfg_type_size = {
	"size", parse_ustring, print_ustring, &cfg_rep_string, NULL };


/*
 * boolean
 */
static isc_result_t
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parse_boolean(cfg_parser_t *pctx, cfg_type_t *type, cfg_obj_t **ret)
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{
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        isc_result_t result;
	isc_boolean_t value;
	cfg_obj_t *obj = NULL;
	UNUSED(type);

	result = cfg_gettoken(pctx, 0);
	if (result != ISC_R_SUCCESS)
		return (result);

	if (pctx->token.type != isc_tokentype_string)
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		goto bad_boolean;
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	if ((strcasecmp(pctx->token.value.as_pointer, "true") == 0) ||
	    (strcasecmp(pctx->token.value.as_pointer, "yes") == 0) ||
	    (strcmp(pctx->token.value.as_pointer, "1") == 0)) {
		value = ISC_TRUE;
	} else if ((strcasecmp(pctx->token.value.as_pointer, "false") == 0) ||
		   (strcasecmp(pctx->token.value.as_pointer, "no") == 0) ||
		   (strcmp(pctx->token.value.as_pointer, "0") == 0)) {
		value = ISC_FALSE;
	} else {
		goto bad_boolean;
	}

	CHECK(create_cfgobj(pctx, &cfg_type_boolean, &obj));
	obj->value.boolean = value;
	*ret = obj;
	return (result);

 bad_boolean:
	parser_error(pctx, LOG_NEAR, "boolean expected");
	return (ISC_R_UNEXPECTEDTOKEN);

 cleanup:
	return (result);
}

static void
print_boolean(cfg_printer_t *pctx, cfg_obj_t *obj) {
	if (obj->value.boolean)
		print(pctx, "yes", 3);
	else
		print(pctx, "no", 2);
}

static cfg_type_t cfg_type_boolean = {
	"boolean", parse_boolean, print_boolean, &cfg_rep_boolean, NULL };

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const char *dialup_enums[] = {
	"notify", "notify-passive", "refresh", "passive", NULL };
static isc_result_t
parse_dialup_type(cfg_parser_t *pctx, cfg_type_t *type, cfg_obj_t **ret) {
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	return (parse_enum_or_other(pctx, type, &cfg_type_boolean, ret));
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}
static cfg_type_t cfg_type_dialuptype = {
	"dialuptype", parse_dialup_type, print_ustring, 
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	&cfg_rep_string, dialup_enums
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};

const char *notify_enums[] = { "explicit", NULL };
static isc_result_t
parse_notify_type(cfg_parser_t *pctx, cfg_type_t *type, cfg_obj_t **ret) {
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}
static cfg_type_t cfg_type_notifytype = {
	"notifytype", parse_notify_type, print_ustring, 
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	&cfg_rep_string, notify_enums,
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};
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static keyword_type_t key_kw = { "key", &cfg_type_astring };
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cfg_type_t cfg_type_keyref = {
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	"keyref", parse_keyvalue, print_keyvalue,
	&cfg_rep_string, &key_kw
};

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static cfg_type_t cfg_type_optional_keyref = {
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	"optional_keyref", parse_optional_keyvalue, print_keyvalue,
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	&cfg_rep_string, &key_kw
};
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/*
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 * Lists.
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 */

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static isc_result_t
create_list(cfg_parser_t *pctx, cfg_type_t *type, cfg_obj_t **obj) {
	isc_result_t result;
	CHECK(create_cfgobj(pctx, type, obj));
	ISC_LIST_INIT((*obj)->value.list);
 cleanup:
	return (result);
}

static isc_result_t
create_listelt(cfg_parser_t *pctx, cfg_listelt_t **eltp) {
	cfg_listelt_t *elt;
	elt = isc_mem_get(pctx->mctx, sizeof(*elt));
	if (elt == NULL)
		return (ISC_R_NOMEMORY);
	elt->obj = NULL;
	ISC_LINK_INIT(elt, link);
	*eltp = elt;
	return (ISC_R_SUCCESS);
}

static void
free_list(cfg_parser_t *pctx, cfg_obj_t *obj) {
	cfg_listelt_t *elt, *next;
	for (elt = ISC_LIST_HEAD(obj->value.list);
	     elt != NULL;
	     elt = next)
	{
		next = ISC_LIST_NEXT(elt, link);
		cfg_obj_destroy(pctx, &elt->obj);
		isc_mem_put(pctx->mctx, elt, sizeof(*elt));
	}
}

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static isc_result_t
parse_list_elt(cfg_parser_t *pctx, cfg_type_t *elttype, cfg_listelt_t **ret)
{
	isc_result_t result;
	cfg_listelt_t *elt = NULL;
	cfg_obj_t *value = NULL;

	CHECK(create_listelt(pctx, &elt));

	result = parse(pctx, elttype, &value);
	if (result != ISC_R_SUCCESS)
		goto cleanup;

	elt->obj = value;

	*ret = elt;
	return (ISC_R_SUCCESS);

 cleanup:
	isc_mem_put(pctx->mctx, elt, sizeof(*elt));
	return (result);
}

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/*
 * Parse a homogeneous list whose elements are of type 'elttype'
 * and where each element is terminated by a semicolon.
 */
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