parser.c

bind-3.2.

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


isc_result_t
cfg_parse_buffer(cfg_parser_t *pctx, isc_buffer_t *buffer,
	const 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);
}

void
cfg_parser_destroy(cfg_parser_t **pctxp) {
	cfg_parser_t *pctx = *pctxp;
	isc_lex_destroy(&pctx->lexer);
	/*
	 * Cleaning up open_files does not
	 * close the files; that was already done
	 * by closing the lexer.
	 */
	CLEANUP_OBJ(pctx->open_files);
	CLEANUP_OBJ(pctx->closed_files);
	isc_mem_put(pctx->mctx, pctx, sizeof(*pctx));
	*pctxp = NULL;
}

/*
 * void
 */
static isc_result_t
parse_void(cfg_parser_t *pctx, const 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);
}

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

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, const cfg_type_t *type, cfg_obj_t **ret) {
        isc_result_t result;
	cfg_obj_t *obj = NULL;
	UNUSED(type);

	CHECK(cfg_gettoken(pctx, ISC_LEXOPT_NUMBER | ISC_LEXOPT_CNUMBER));
	if (pctx->token.type != isc_tokentype_number) {
		parser_error(pctx, LOG_NEAR, "expected number");
		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_cstr(cfg_printer_t *pctx, const char *s) {
	print(pctx, s, strlen(s));
}

static void
print_uint(cfg_printer_t *pctx, unsigned int u) {
	char buf[32];
	snprintf(buf, sizeof(buf), "%u", u);
	print_cstr(pctx, buf);
}

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

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

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 = {
	"integer", parse_uint32, print_uint32, &cfg_rep_uint32, NULL };


/*
 * uint64
 */
isc_boolean_t
cfg_obj_isuint64(cfg_obj_t *obj) {
	REQUIRE(obj != NULL);
	return (ISC_TF(obj->type->rep == &cfg_rep_uint64));
}

isc_uint64_t
cfg_obj_asuint64(cfg_obj_t *obj) {
	REQUIRE(obj != NULL && obj->type->rep == &cfg_rep_uint64);
	return (obj->value.uint64);
}

static isc_result_t
parse_unitstring(char *str, isc_resourcevalue_t *valuep) {
	char *endp;
	unsigned int len;
	isc_uint64_t value;
	isc_uint64_t unit;

	value = isc_string_touint64(str, &endp, 10);
	if (*endp == 0) {
		*valuep = value;
		return (ISC_R_SUCCESS);
	}

	len = strlen(str);
	if (len < 2 || endp[1] != '\0')
		return (ISC_R_FAILURE);

	switch (str[len - 1]) {
	case 'k':
	case 'K':
		unit = 1024;
		break;
	case 'm':
	case 'M':
		unit = 1024 * 1024;
		break;
	case 'g':
	case 'G':
		unit = 1024 * 1024 * 1024;
		break;
	default:
		return (ISC_R_FAILURE);
	}
	if (value > ISC_UINT64_MAX / unit)
		return (ISC_R_FAILURE);
	*valuep = value * unit;
	return (ISC_R_SUCCESS);
}

static void
print_uint64(cfg_printer_t *pctx, cfg_obj_t *obj) {
	char buf[32];
	sprintf(buf, "%" ISC_PRINT_QUADFORMAT "u", obj->value.uint64);
	print_cstr(pctx, buf);
}

static cfg_type_t cfg_type_uint64 = {
	"64_bit_integer", NULL, print_uint64, &cfg_rep_uint64, NULL };

static isc_result_t
parse_sizeval(cfg_parser_t *pctx, const cfg_type_t *type, cfg_obj_t **ret) {
	isc_result_t result;
	cfg_obj_t *obj = NULL;
	isc_uint64_t val;

	UNUSED(type);

	CHECK(cfg_gettoken(pctx, 0));
	if (pctx->token.type != isc_tokentype_string) {
		result = ISC_R_UNEXPECTEDTOKEN;
		goto cleanup;
	}
	CHECK(parse_unitstring(pctx->token.value.as_pointer, &val));

	CHECK(create_cfgobj(pctx, &cfg_type_uint64, &obj));
	obj->value.uint64 = val;
	*ret = obj;
	return (ISC_R_SUCCESS);

 cleanup:
	parser_error(pctx, LOG_NEAR, "expected integer and optional unit");
	return (result);
}

/*
 * A size value (number + optional unit).
 */
static cfg_type_t cfg_type_sizeval = {
	"sizeval", parse_sizeval, print_uint64, &cfg_rep_uint64, NULL };

/*
 * A size, "unlimited", or "default".
 */

static isc_result_t
parse_size(cfg_parser_t *pctx, const cfg_type_t *type, cfg_obj_t **ret) {
	return (parse_enum_or_other(pctx, type, &cfg_type_sizeval, ret));
}

static const char *size_enums[] = { "unlimited", "default", NULL };
static cfg_type_t cfg_type_size = {
	"size", parse_size, print_ustring, &cfg_rep_string, size_enums
};

/*
 * A size or "unlimited", but not "default".
 */
static const char *sizenodefault_enums[] = { "unlimited", NULL };
static cfg_type_t cfg_type_sizenodefault = {
	"size_no_default", parse_size, print_ustring, &cfg_rep_string,
	sizenodefault_enums
};

/*
 * optional_keyvalue
 */
static isc_result_t
parse_maybe_optional_keyvalue(cfg_parser_t *pctx, const cfg_type_t *type,
			      isc_boolean_t optional, cfg_obj_t **ret)
{
        isc_result_t result;
	cfg_obj_t *obj = NULL;
	const 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 {
		if (optional) {
			CHECK(parse_void(pctx, NULL, &obj));
		} else {
			parser_error(pctx, LOG_NEAR, "expected '%s'",
				     kw->name);
			result = ISC_R_UNEXPECTEDTOKEN;
			goto cleanup;
		}
	}
	*ret = obj;
 cleanup:
	return (result);
}

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

static void
print_keyvalue(cfg_printer_t *pctx, cfg_obj_t *obj) {
	const keyword_type_t *kw = obj->type->of;
	print_cstr(pctx, 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
create_string(cfg_parser_t *pctx, const char *contents, const cfg_type_t *type,
	      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) {
		isc_mem_put(pctx->mctx, obj, sizeof(*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, const cfg_type_t *type, cfg_obj_t **ret) {
        isc_result_t result;
	UNUSED(type);

	CHECK(cfg_gettoken(pctx, 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, const 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, const 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);
}

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

static isc_result_t
check_enum(cfg_parser_t *pctx, cfg_obj_t *obj, const char *const *enums) {
	const char *s = obj->value.string.base;
	if (is_enum(s, enums))
		return (ISC_R_SUCCESS);
	parser_error(pctx, 0, "'%s' unexpected", s);
	return (ISC_R_UNEXPECTEDTOKEN);
}

static isc_result_t
parse_enum(cfg_parser_t *pctx, const 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);
}

static isc_result_t
parse_enum_or_other(cfg_parser_t *pctx, const cfg_type_t *enumtype,
		    const 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);
}


/*
 * 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);
}

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

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

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

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

/* Quoted string only */
static cfg_type_t cfg_type_qstring = {
	"quoted_string", 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 };


/*
 * boolean
 */
static isc_result_t
parse_boolean(cfg_parser_t *pctx, const cfg_type_t *type, cfg_obj_t **ret)
{
        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)
		goto bad_boolean;

	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;
	}