dbus-marshal-validate.c
/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
/* dbus-marshal-validate.c Validation routines for marshaled data
*
* Copyright (C) 2005 Red Hat, Inc.
*
* Licensed under the Academic Free License version 2.1
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#include <config.h>
#include "dbus-internals.h"
#include "dbus-marshal-validate.h"
#include "dbus-marshal-recursive.h"
#include "dbus-marshal-basic.h"
#include "dbus-signature.h"
#include "dbus-string.h"
DBusValidity
_dbus_validate_signature_with_reason (const DBusString *type_str,
int type_pos,
int len)
{
const unsigned char *p;
const unsigned char *end;
int last;
int struct_depth;
int array_depth;
int dict_entry_depth;
DBusValidity result;
int element_count;
DBusList *element_count_stack;
result = DBUS_VALID;
element_count_stack = NULL;
if (!_dbus_list_append (&element_count_stack, _DBUS_INT_TO_POINTER (0)))
{
result = DBUS_VALIDITY_UNKNOWN_OOM_ERROR;
goto out;
}
_dbus_assert (type_str != NULL);
_dbus_assert (type_pos < _DBUS_INT32_MAX - len);
_dbus_assert (len >= 0);
_dbus_assert (type_pos >= 0);
if (len > DBUS_MAXIMUM_SIGNATURE_LENGTH)
{
result = DBUS_INVALID_SIGNATURE_TOO_LONG;
goto out;
}
p = _dbus_string_get_const_data_len (type_str, type_pos, 0);
end = _dbus_string_get_const_data_len (type_str, type_pos + len, 0);
struct_depth = 0;
array_depth = 0;
dict_entry_depth = 0;
last = DBUS_TYPE_INVALID;
while (p != end)
{
switch (*p)
{
case DBUS_TYPE_BYTE:
case DBUS_TYPE_BOOLEAN:
case DBUS_TYPE_INT16:
case DBUS_TYPE_UINT16:
case DBUS_TYPE_INT32:
case DBUS_TYPE_UINT32:
case DBUS_TYPE_UNIX_FD:
case DBUS_TYPE_INT64:
case DBUS_TYPE_UINT64:
case DBUS_TYPE_DOUBLE:
case DBUS_TYPE_STRING:
case DBUS_TYPE_OBJECT_PATH:
case DBUS_TYPE_SIGNATURE:
case DBUS_TYPE_VARIANT:
break;
case DBUS_TYPE_ARRAY:
array_depth += 1;
if (array_depth > DBUS_MAXIMUM_TYPE_RECURSION_DEPTH)
{
result = DBUS_INVALID_EXCEEDED_MAXIMUM_ARRAY_RECURSION;
goto out;
}
break;
case DBUS_STRUCT_BEGIN_CHAR:
struct_depth += 1;
if (struct_depth > DBUS_MAXIMUM_TYPE_RECURSION_DEPTH)
{
result = DBUS_INVALID_EXCEEDED_MAXIMUM_STRUCT_RECURSION;
goto out;
}
if (!_dbus_list_append (&element_count_stack,
_DBUS_INT_TO_POINTER (0)))
{
result = DBUS_VALIDITY_UNKNOWN_OOM_ERROR;
goto out;
}
break;
case DBUS_STRUCT_END_CHAR:
if (struct_depth == 0)
{
result = DBUS_INVALID_STRUCT_ENDED_BUT_NOT_STARTED;
goto out;
}
if (last == DBUS_STRUCT_BEGIN_CHAR)
{
result = DBUS_INVALID_STRUCT_HAS_NO_FIELDS;
goto out;
}
_dbus_list_pop_last (&element_count_stack);
struct_depth -= 1;
break;
case DBUS_DICT_ENTRY_BEGIN_CHAR:
if (last != DBUS_TYPE_ARRAY)
{
result = DBUS_INVALID_DICT_ENTRY_NOT_INSIDE_ARRAY;
goto out;
}
dict_entry_depth += 1;
if (dict_entry_depth > DBUS_MAXIMUM_TYPE_RECURSION_DEPTH)
{
result = DBUS_INVALID_EXCEEDED_MAXIMUM_DICT_ENTRY_RECURSION;
goto out;
}
if (!_dbus_list_append (&element_count_stack,
_DBUS_INT_TO_POINTER (0)))
{
result = DBUS_VALIDITY_UNKNOWN_OOM_ERROR;
goto out;
}
break;
case DBUS_DICT_ENTRY_END_CHAR:
if (dict_entry_depth == 0)
{
result = DBUS_INVALID_DICT_ENTRY_ENDED_BUT_NOT_STARTED;
goto out;
}
dict_entry_depth -= 1;
element_count =
_DBUS_POINTER_TO_INT (_dbus_list_pop_last (&element_count_stack));
if (element_count != 2)
{
if (element_count == 0)
result = DBUS_INVALID_DICT_ENTRY_HAS_NO_FIELDS;
else if (element_count == 1)
result = DBUS_INVALID_DICT_ENTRY_HAS_ONLY_ONE_FIELD;
else
result = DBUS_INVALID_DICT_ENTRY_HAS_TOO_MANY_FIELDS;
goto out;
}
break;
case DBUS_TYPE_STRUCT: /* doesn't appear in signatures */
case DBUS_TYPE_DICT_ENTRY: /* ditto */
default:
result = DBUS_INVALID_UNKNOWN_TYPECODE;
goto out;
}
if (*p != DBUS_TYPE_ARRAY &&
*p != DBUS_DICT_ENTRY_BEGIN_CHAR &&
*p != DBUS_STRUCT_BEGIN_CHAR)
{
element_count =
_DBUS_POINTER_TO_INT (_dbus_list_pop_last (&element_count_stack));
++element_count;
if (!_dbus_list_append (&element_count_stack,
_DBUS_INT_TO_POINTER (element_count)))
{
result = DBUS_VALIDITY_UNKNOWN_OOM_ERROR;
goto out;
}
}
if (array_depth > 0)
{
if (*p == DBUS_TYPE_ARRAY && p != end)
{
const char *p1;
p1 = p + 1;
if (*p1 == DBUS_STRUCT_END_CHAR ||
*p1 == DBUS_DICT_ENTRY_END_CHAR)
{
result = DBUS_INVALID_MISSING_ARRAY_ELEMENT_TYPE;
goto out;
}
}
else
{
array_depth = 0;
}
}
if (last == DBUS_DICT_ENTRY_BEGIN_CHAR)
{
if (!(dbus_type_is_valid (*p) && dbus_type_is_basic (*p)))
{
result = DBUS_INVALID_DICT_KEY_MUST_BE_BASIC_TYPE;
goto out;
}
}
last = *p;
++p;
}
if (array_depth > 0)
{
result = DBUS_INVALID_MISSING_ARRAY_ELEMENT_TYPE;
goto out;
}
if (struct_depth > 0)
{
result = DBUS_INVALID_STRUCT_STARTED_BUT_NOT_ENDED;
goto out;
}
if (dict_entry_depth > 0)
{
result = DBUS_INVALID_DICT_ENTRY_STARTED_BUT_NOT_ENDED;
goto out;
}
_dbus_assert (last != DBUS_TYPE_ARRAY);
_dbus_assert (last != DBUS_STRUCT_BEGIN_CHAR);
_dbus_assert (last != DBUS_DICT_ENTRY_BEGIN_CHAR);
result = DBUS_VALID;
out:
_dbus_list_clear (&element_count_stack);
return result;
}
/* note: this function is also used to validate the header's values,
* since the header is a valid body with a particular signature.
*/
static DBusValidity
validate_body_helper (DBusTypeReader *reader,
int byte_order,
dbus_bool_t walk_reader_to_end,
int total_depth,
const unsigned char *p,
const unsigned char *end,
const unsigned char **new_p)
{
int current_type;
/* The spec allows arrays and structs to each nest 32, for total
* nesting of 2*32. We want to impose the same limit on "dynamic"
* value nesting (not visible in the signature) which is introduced
* by DBUS_TYPE_VARIANT.
*/
if (total_depth > (DBUS_MAXIMUM_TYPE_RECURSION_DEPTH * 2))
{
return DBUS_INVALID_NESTED_TOO_DEEPLY;
}
while ((current_type = _dbus_type_reader_get_current_type (reader)) != DBUS_TYPE_INVALID)
{
const unsigned char *a;
int alignment;
#if 0
_dbus_verbose (" validating value of type %s type reader %p type_pos %d p %p end %p %d remain\n",
_dbus_type_to_string (current_type), reader, reader->type_pos, p, end,
(int) (end - p));
#endif
/* Guarantee that p has one byte to look at */
if (p == end)
return DBUS_INVALID_NOT_ENOUGH_DATA;
switch (current_type)
{
case DBUS_TYPE_BYTE:
++p;
break;
case DBUS_TYPE_BOOLEAN:
case DBUS_TYPE_INT16:
case DBUS_TYPE_UINT16:
case DBUS_TYPE_INT32:
case DBUS_TYPE_UINT32:
case DBUS_TYPE_UNIX_FD:
case DBUS_TYPE_INT64:
case DBUS_TYPE_UINT64:
case DBUS_TYPE_DOUBLE:
alignment = _dbus_type_get_alignment (current_type);
a = _DBUS_ALIGN_ADDRESS (p, alignment);
if (a >= end)
return DBUS_INVALID_NOT_ENOUGH_DATA;
while (p != a)
{
if (*p != '\0')
return DBUS_INVALID_ALIGNMENT_PADDING_NOT_NUL;
++p;
}
if (current_type == DBUS_TYPE_BOOLEAN)
{
dbus_uint32_t v = _dbus_unpack_uint32 (byte_order,
p);
if (!(v == 0 || v == 1))
return DBUS_INVALID_BOOLEAN_NOT_ZERO_OR_ONE;
}
p += alignment;
break;
case DBUS_TYPE_ARRAY:
case DBUS_TYPE_STRING:
case DBUS_TYPE_OBJECT_PATH:
{
dbus_uint32_t claimed_len;
a = _DBUS_ALIGN_ADDRESS (p, 4);
if (a + 4 > end)
return DBUS_INVALID_NOT_ENOUGH_DATA;
while (p != a)
{
if (*p != '\0')
return DBUS_INVALID_ALIGNMENT_PADDING_NOT_NUL;
++p;
}
claimed_len = _dbus_unpack_uint32 (byte_order, p);
p += 4;
/* p may now be == end */
_dbus_assert (p <= end);
if (current_type == DBUS_TYPE_ARRAY)
{
int array_elem_type = _dbus_type_reader_get_element_type (reader);
if (!dbus_type_is_valid (array_elem_type))
{
return DBUS_INVALID_UNKNOWN_TYPECODE;
}
alignment = _dbus_type_get_alignment (array_elem_type);
a = _DBUS_ALIGN_ADDRESS (p, alignment);
/* a may now be == end */
if (a > end)
return DBUS_INVALID_NOT_ENOUGH_DATA;
while (p != a)
{
if (*p != '\0')
return DBUS_INVALID_ALIGNMENT_PADDING_NOT_NUL;
++p;
}
}
if (claimed_len > (unsigned long) (end - p))
return DBUS_INVALID_LENGTH_OUT_OF_BOUNDS;
if (current_type == DBUS_TYPE_OBJECT_PATH)
{
DBusString str;
_dbus_string_init_const_len (&str, p, claimed_len);
if (!_dbus_validate_path (&str, 0,
_dbus_string_get_length (&str)))
return DBUS_INVALID_BAD_PATH;
p += claimed_len;
}
else if (current_type == DBUS_TYPE_STRING)
{
DBusString str;
_dbus_string_init_const_len (&str, p, claimed_len);
if (!_dbus_string_validate_utf8 (&str, 0,
_dbus_string_get_length (&str)))
return DBUS_INVALID_BAD_UTF8_IN_STRING;
p += claimed_len;
}
else if (current_type == DBUS_TYPE_ARRAY && claimed_len > 0)
{
DBusTypeReader sub;
DBusValidity validity;
const unsigned char *array_end;
int array_elem_type;
if (claimed_len > DBUS_MAXIMUM_ARRAY_LENGTH)
return DBUS_INVALID_ARRAY_LENGTH_EXCEEDS_MAXIMUM;
/* Remember that the reader is types only, so we can't
* use it to iterate over elements. It stays the same
* for all elements.
*/
_dbus_type_reader_recurse (reader, &sub);
array_end = p + claimed_len;
array_elem_type = _dbus_type_reader_get_element_type (reader);
/* avoid recursive call to validate_body_helper if this is an array
* of fixed-size elements
*/
if (dbus_type_is_fixed (array_elem_type))
{
/* bools need to be handled differently, because they can
* have an invalid value
*/
if (array_elem_type == DBUS_TYPE_BOOLEAN)
{
dbus_uint32_t v;
alignment = _dbus_type_get_alignment (array_elem_type);
while (p < array_end)
{
v = _dbus_unpack_uint32 (byte_order, p);
if (!(v == 0 || v == 1))
return DBUS_INVALID_BOOLEAN_NOT_ZERO_OR_ONE;
p += alignment;
}
}
else
{
p = array_end;
}
}
else
{
while (p < array_end)
{
validity = validate_body_helper (&sub, byte_order, FALSE,
total_depth + 1,
p, end, &p);
if (validity != DBUS_VALID)
return validity;
}
}
if (p != array_end)
return DBUS_INVALID_ARRAY_LENGTH_INCORRECT;
}
/* check nul termination */
if (current_type != DBUS_TYPE_ARRAY)
{
if (p == end)
return DBUS_INVALID_NOT_ENOUGH_DATA;
if (*p != '\0')
return DBUS_INVALID_STRING_MISSING_NUL;
++p;
}
}
break;
case DBUS_TYPE_SIGNATURE:
{
dbus_uint32_t claimed_len;
DBusString str;
DBusValidity validity;
claimed_len = *p;
++p;
/* 1 is for nul termination */
if (claimed_len + 1 > (unsigned long) (end - p))
return DBUS_INVALID_SIGNATURE_LENGTH_OUT_OF_BOUNDS;
_dbus_string_init_const_len (&str, p, claimed_len);
validity =
_dbus_validate_signature_with_reason (&str, 0,
_dbus_string_get_length (&str));
if (validity != DBUS_VALID)
return validity;
p += claimed_len;
_dbus_assert (p < end);
if (*p != DBUS_TYPE_INVALID)
return DBUS_INVALID_SIGNATURE_MISSING_NUL;
++p;
_dbus_verbose ("p = %p end = %p claimed_len %u\n", p, end, claimed_len);
}
break;
case DBUS_TYPE_VARIANT:
{
/* 1 byte sig len, sig typecodes, align to
* contained-type-boundary, values.
*/
/* In addition to normal signature validation, we need to be sure
* the signature contains only a single (possibly container) type.
*/
dbus_uint32_t claimed_len;
DBusString sig;
DBusTypeReader sub;
DBusValidity validity;
int contained_alignment;
int contained_type;
DBusValidity reason;
claimed_len = *p;
++p;
/* + 1 for nul */
if (claimed_len + 1 > (unsigned long) (end - p))
return DBUS_INVALID_VARIANT_SIGNATURE_LENGTH_OUT_OF_BOUNDS;
_dbus_string_init_const_len (&sig, p, claimed_len);
reason = _dbus_validate_signature_with_reason (&sig, 0,
_dbus_string_get_length (&sig));
if (!(reason == DBUS_VALID))
{
if (reason == DBUS_VALIDITY_UNKNOWN_OOM_ERROR)
return reason;
else
return DBUS_INVALID_VARIANT_SIGNATURE_BAD;
}
p += claimed_len;
if (*p != DBUS_TYPE_INVALID)
return DBUS_INVALID_VARIANT_SIGNATURE_MISSING_NUL;
++p;
contained_type = _dbus_first_type_in_signature (&sig, 0);
if (contained_type == DBUS_TYPE_INVALID)
return DBUS_INVALID_VARIANT_SIGNATURE_EMPTY;
contained_alignment = _dbus_type_get_alignment (contained_type);
a = _DBUS_ALIGN_ADDRESS (p, contained_alignment);
if (a > end)
return DBUS_INVALID_NOT_ENOUGH_DATA;
while (p != a)
{
if (*p != '\0')
return DBUS_INVALID_ALIGNMENT_PADDING_NOT_NUL;
++p;
}
_dbus_type_reader_init_types_only (&sub, &sig, 0);
_dbus_assert (_dbus_type_reader_get_current_type (&sub) != DBUS_TYPE_INVALID);
validity = validate_body_helper (&sub, byte_order, FALSE,
total_depth + 1,
p, end, &p);
if (validity != DBUS_VALID)
return validity;
if (_dbus_type_reader_next (&sub))
return DBUS_INVALID_VARIANT_SIGNATURE_SPECIFIES_MULTIPLE_VALUES;
_dbus_assert (_dbus_type_reader_get_current_type (&sub) == DBUS_TYPE_INVALID);
}
break;
case DBUS_TYPE_DICT_ENTRY:
case DBUS_TYPE_STRUCT:
{
DBusTypeReader sub;
DBusValidity validity;
a = _DBUS_ALIGN_ADDRESS (p, 8);
if (a > end)
return DBUS_INVALID_NOT_ENOUGH_DATA;
while (p != a)
{
if (*p != '\0')
return DBUS_INVALID_ALIGNMENT_PADDING_NOT_NUL;
++p;
}
_dbus_type_reader_recurse (reader, &sub);
validity = validate_body_helper (&sub, byte_order, TRUE,
total_depth + 1,
p, end, &p);
if (validity != DBUS_VALID)
return validity;
}
break;
default:
_dbus_assert_not_reached ("invalid typecode in supposedly-validated signature");
break;
}
#if 0
_dbus_verbose (" validated value of type %s type reader %p type_pos %d p %p end %p %d remain\n",
_dbus_type_to_string (current_type), reader, reader->type_pos, p, end,
(int) (end - p));
#endif
if (p > end)
{
_dbus_verbose ("not enough data!!! p = %p end = %p end-p = %d\n",
p, end, (int) (end - p));
return DBUS_INVALID_NOT_ENOUGH_DATA;
}
if (walk_reader_to_end)
_dbus_type_reader_next (reader);
else
break;
}
if (new_p)
*new_p = p;
return DBUS_VALID;
}
DBusValidity
_dbus_validate_body_with_reason (const DBusString *expected_signature,
int expected_signature_start,
int byte_order,
int *bytes_remaining,
const DBusString *value_str,
int value_pos,
int len)
{
DBusTypeReader reader;
const unsigned char *p;
const unsigned char *end;
DBusValidity validity;
_dbus_assert (len >= 0);
_dbus_assert (value_pos >= 0);
_dbus_assert (value_pos <= _dbus_string_get_length (value_str) - len);
_dbus_verbose ("validating body from pos %d len %d sig '%s'\n",
value_pos, len, _dbus_string_get_const_data_len (expected_signature,
expected_signature_start,
0));
_dbus_type_reader_init_types_only (&reader,
expected_signature, expected_signature_start);
p = _dbus_string_get_const_data_len (value_str, value_pos, len);
end = p + len;
validity = validate_body_helper (&reader, byte_order, TRUE, 0, p, end, &p);
if (validity != DBUS_VALID)
return validity;
if (bytes_remaining)
{
*bytes_remaining = end - p;
return DBUS_VALID;
}
else if (p < end)
return DBUS_INVALID_TOO_MUCH_DATA;
else
{
_dbus_assert (p == end);
return DBUS_VALID;
}
}
#define VALID_INITIAL_NAME_CHARACTER(c) \
( ((c) >= 'A' && (c) <= 'Z') || \
((c) >= 'a' && (c) <= 'z') || \
((c) == '_') )
#define VALID_NAME_CHARACTER(c) \
( ((c) >= '0' && (c) <= '9') || \
((c) >= 'A' && (c) <= 'Z') || \
((c) >= 'a' && (c) <= 'z') || \
((c) == '_') )
dbus_bool_t
_dbus_validate_path (const DBusString *str,
int start,
int len)
{
const unsigned char *s;
const unsigned char *end;
const unsigned char *last_slash;
_dbus_assert (start >= 0);
_dbus_assert (len >= 0);
_dbus_assert (start <= _dbus_string_get_length (str));
if (len > _dbus_string_get_length (str) - start)
return FALSE;
if (len == 0)
return FALSE;
s = _dbus_string_get_const_data (str) + start;
end = s + len;
if (*s != '/')
return FALSE;
last_slash = s;
++s;
while (s != end)
{
if (*s == '/')
{
if ((s - last_slash) < 2)
return FALSE; /* no empty path components allowed */
last_slash = s;
}
else
{
if (_DBUS_UNLIKELY (!VALID_NAME_CHARACTER (*s)))
return FALSE;
}
++s;
}
if ((end - last_slash) < 2 &&
len > 1)
return FALSE; /* trailing slash not allowed unless the string is "/" */
return TRUE;
}
const char *
_dbus_validity_to_error_message (DBusValidity validity)
{
switch (validity)
{
case DBUS_VALIDITY_UNKNOWN_OOM_ERROR: return "Out of memory";
case DBUS_INVALID_FOR_UNKNOWN_REASON: return "Unknown reason";
case DBUS_VALID_BUT_INCOMPLETE: return "Valid but incomplete";
case DBUS_VALIDITY_UNKNOWN: return "Validity unknown";
case DBUS_VALID: return "Valid";
case DBUS_INVALID_UNKNOWN_TYPECODE: return "Unknown typecode";
case DBUS_INVALID_MISSING_ARRAY_ELEMENT_TYPE: return "Missing array element type";
case DBUS_INVALID_SIGNATURE_TOO_LONG: return "Signature is too long";
case DBUS_INVALID_EXCEEDED_MAXIMUM_ARRAY_RECURSION: return "Exceeded maximum array recursion";
case DBUS_INVALID_EXCEEDED_MAXIMUM_STRUCT_RECURSION: return "Exceeded maximum struct recursion";
case DBUS_INVALID_STRUCT_ENDED_BUT_NOT_STARTED: return "Struct ended but not started";
case DBUS_INVALID_STRUCT_STARTED_BUT_NOT_ENDED: return "Struct started but not ended";
case DBUS_INVALID_STRUCT_HAS_NO_FIELDS: return "Struct has no fields";
case DBUS_INVALID_ALIGNMENT_PADDING_NOT_NUL: return "Alignment padding not null";
case DBUS_INVALID_BOOLEAN_NOT_ZERO_OR_ONE: return "Boolean is not zero or one";
case DBUS_INVALID_NOT_ENOUGH_DATA: return "Not enough data";
case DBUS_INVALID_TOO_MUCH_DATA: return "Too much data";
case DBUS_INVALID_BAD_BYTE_ORDER: return "Bad byte order";
case DBUS_INVALID_BAD_PROTOCOL_VERSION: return "Bad protocol version";
case DBUS_INVALID_BAD_MESSAGE_TYPE: return "Bad message type";
case DBUS_INVALID_BAD_SERIAL: return "Bad serial";
case DBUS_INVALID_INSANE_FIELDS_ARRAY_LENGTH: return "Insane fields array length";
case DBUS_INVALID_INSANE_BODY_LENGTH: return "Insane body length";
case DBUS_INVALID_MESSAGE_TOO_LONG: return "Message too long";
case DBUS_INVALID_HEADER_FIELD_CODE: return "Header field code";
case DBUS_INVALID_HEADER_FIELD_HAS_WRONG_TYPE: return "Header field has wrong type";
case DBUS_INVALID_USES_LOCAL_INTERFACE: return "Uses local interface";
case DBUS_INVALID_USES_LOCAL_PATH: return "Uses local path";
case DBUS_INVALID_HEADER_FIELD_APPEARS_TWICE: return "Header field appears twice";
case DBUS_INVALID_BAD_DESTINATION: return "Bad destination";
case DBUS_INVALID_BAD_INTERFACE: return "Bad interface";
case DBUS_INVALID_BAD_MEMBER: return "Bad member";
case DBUS_INVALID_BAD_ERROR_NAME: return "Bad error name";
case DBUS_INVALID_BAD_SENDER: return "Bad sender";
case DBUS_INVALID_MISSING_PATH: return "Missing path";
case DBUS_INVALID_MISSING_INTERFACE: return "Missing interface";
case DBUS_INVALID_MISSING_MEMBER: return "Missing member";
case DBUS_INVALID_MISSING_ERROR_NAME: return "Missing error name";
case DBUS_INVALID_MISSING_REPLY_SERIAL: return "Missing reply serial";
case DBUS_INVALID_LENGTH_OUT_OF_BOUNDS: return "Length out of bounds";
case DBUS_INVALID_ARRAY_LENGTH_EXCEEDS_MAXIMUM: return "Array length exceeds maximum";
case DBUS_INVALID_BAD_PATH: return "Bad path";
case DBUS_INVALID_SIGNATURE_LENGTH_OUT_OF_BOUNDS: return "Signature length out of bounds";
case DBUS_INVALID_BAD_UTF8_IN_STRING: return "Bad utf8 in string";
case DBUS_INVALID_ARRAY_LENGTH_INCORRECT: return "Array length incorrect";
case DBUS_INVALID_VARIANT_SIGNATURE_LENGTH_OUT_OF_BOUNDS: return "Variant signature length out of bounds";
case DBUS_INVALID_VARIANT_SIGNATURE_BAD: return "Variant signature bad";
case DBUS_INVALID_VARIANT_SIGNATURE_EMPTY: return "Variant signature empty";
case DBUS_INVALID_VARIANT_SIGNATURE_SPECIFIES_MULTIPLE_VALUES: return "Variant signature specifies multiple values";
case DBUS_INVALID_VARIANT_SIGNATURE_MISSING_NUL: return "Variant signature missing nul";
case DBUS_INVALID_STRING_MISSING_NUL: return "String missing nul";
case DBUS_INVALID_SIGNATURE_MISSING_NUL: return "Signature missing nul";
case DBUS_INVALID_EXCEEDED_MAXIMUM_DICT_ENTRY_RECURSION: return "Exceeded maximum dict entry recursion";
case DBUS_INVALID_DICT_ENTRY_ENDED_BUT_NOT_STARTED: return "Dict entry ended but not started";
case DBUS_INVALID_DICT_ENTRY_STARTED_BUT_NOT_ENDED: return "Dict entry started but not ended";
case DBUS_INVALID_DICT_ENTRY_HAS_NO_FIELDS: return "Dict entry has no fields";
case DBUS_INVALID_DICT_ENTRY_HAS_ONLY_ONE_FIELD: return "Dict entry has only one field";
case DBUS_INVALID_DICT_ENTRY_HAS_TOO_MANY_FIELDS: return "Dict entry has too many fields";
case DBUS_INVALID_DICT_ENTRY_NOT_INSIDE_ARRAY: return "Dict entry not inside array";
case DBUS_INVALID_DICT_KEY_MUST_BE_BASIC_TYPE: return "Dict key must be basic type";
case DBUS_INVALID_NESTED_TOO_DEEPLY: return "Variants cannot be used to create a hugely recursive tree of values";
default:
return "Invalid";
}
}
dbus_bool_t
_dbus_validate_interface (const DBusString *str,
int start,
int len)
{
const unsigned char *s;
const unsigned char *end;
const unsigned char *iface;
const unsigned char *last_dot;
_dbus_assert (start >= 0);
_dbus_assert (len >= 0);
_dbus_assert (start <= _dbus_string_get_length (str));
if (len > _dbus_string_get_length (str) - start)
return FALSE;
if (len > DBUS_MAXIMUM_NAME_LENGTH)
return FALSE;
if (len == 0)
return FALSE;
last_dot = NULL;
iface = _dbus_string_get_const_data (str) + start;
end = iface + len;
s = iface;
/* check special cases of first char so it doesn't have to be done
* in the loop. Note we know len > 0
*/
if (_DBUS_UNLIKELY (*s == '.')) /* disallow starting with a . */
return FALSE;
else if (_DBUS_UNLIKELY (!VALID_INITIAL_NAME_CHARACTER (*s)))
return FALSE;
else
++s;
while (s != end)
{
if (*s == '.')
{
if (_DBUS_UNLIKELY ((s + 1) == end))
return FALSE;
else if (_DBUS_UNLIKELY (!VALID_INITIAL_NAME_CHARACTER (*(s + 1))))
return FALSE;
last_dot = s;
++s; /* we just validated the next char, so skip two */
}
else if (_DBUS_UNLIKELY (!VALID_NAME_CHARACTER (*s)))
{
return FALSE;
}
++s;
}
if (_DBUS_UNLIKELY (last_dot == NULL))
return FALSE;
return TRUE;
}
dbus_bool_t
_dbus_validate_member (const DBusString *str,
int start,
int len)
{
const unsigned char *s;
const unsigned char *end;
const unsigned char *member;
_dbus_assert (start >= 0);
_dbus_assert (len >= 0);
_dbus_assert (start <= _dbus_string_get_length (str));
if (len > _dbus_string_get_length (str) - start)
return FALSE;
if (len > DBUS_MAXIMUM_NAME_LENGTH)
return FALSE;
if (len == 0)
return FALSE;
member = _dbus_string_get_const_data (str) + start;
end = member + len;
s = member;
/* check special cases of first char so it doesn't have to be done
* in the loop. Note we know len > 0
*/
if (_DBUS_UNLIKELY (!VALID_INITIAL_NAME_CHARACTER (*s)))
return FALSE;
else
++s;
while (s != end)
{
if (_DBUS_UNLIKELY (!VALID_NAME_CHARACTER (*s)))
{
return FALSE;
}
++s;
}
return TRUE;
}
dbus_bool_t
_dbus_validate_error_name (const DBusString *str,
int start,
int len)
{
/* Same restrictions as interface name at the moment */
return _dbus_validate_interface (str, start, len);
}
#define VALID_INITIAL_BUS_NAME_CHARACTER(c) \
( ((c) >= 'A' && (c) <= 'Z') || \
((c) >= 'a' && (c) <= 'z') || \
((c) == '_') || ((c) == '-'))
#define VALID_BUS_NAME_CHARACTER(c) \
( ((c) >= '0' && (c) <= '9') || \
((c) >= 'A' && (c) <= 'Z') || \
((c) >= 'a' && (c) <= 'z') || \
((c) == '_') || ((c) == '-'))
static dbus_bool_t
_dbus_validate_bus_name_full (const DBusString *str,
int start,
int len,
dbus_bool_t is_namespace)
{
const unsigned char *s;
const unsigned char *end;
const unsigned char *iface;
const unsigned char *last_dot;
_dbus_assert (start >= 0);
_dbus_assert (len >= 0);
_dbus_assert (start <= _dbus_string_get_length (str));
if (len > _dbus_string_get_length (str) - start)
return FALSE;
if (len > DBUS_MAXIMUM_NAME_LENGTH)
return FALSE;
if (len == 0)
return FALSE;
last_dot = NULL;
iface = _dbus_string_get_const_data (str) + start;
end = iface + len;
s = iface;
/* check special cases of first char so it doesn't have to be done
* in the loop. Note we know len > 0
*/
if (*s == ':')
{
/* unique name */
++s;
while (s != end)
{
if (*s == '.')
{
if (_DBUS_UNLIKELY ((s + 1) == end))
return FALSE;
if (_DBUS_UNLIKELY (!VALID_BUS_NAME_CHARACTER (*(s + 1))))
return FALSE;
++s; /* we just validated the next char, so skip two */
}
else if (_DBUS_UNLIKELY (!VALID_BUS_NAME_CHARACTER (*s)))
{
return FALSE;
}
++s;
}
return TRUE;
}
else if (_DBUS_UNLIKELY (*s == '.')) /* disallow starting with a . */
return FALSE;
else if (_DBUS_UNLIKELY (!VALID_INITIAL_BUS_NAME_CHARACTER (*s)))
return FALSE;
else
++s;
while (s != end)
{
if (*s == '.')
{
if (_DBUS_UNLIKELY ((s + 1) == end))
return FALSE;
else if (_DBUS_UNLIKELY (!VALID_INITIAL_BUS_NAME_CHARACTER (*(s + 1))))
return FALSE;
last_dot = s;
++s; /* we just validated the next char, so skip two */
}
else if (_DBUS_UNLIKELY (!VALID_BUS_NAME_CHARACTER (*s)))
{
return FALSE;
}
++s;
}
if (!is_namespace && _DBUS_UNLIKELY (last_dot == NULL))
return FALSE;
return TRUE;
}
dbus_bool_t
_dbus_validate_bus_name (const DBusString *str,
int start,
int len)
{
return _dbus_validate_bus_name_full (str, start, len, FALSE);
}
dbus_bool_t
_dbus_validate_bus_namespace (const DBusString *str,
int start,
int len)
{
return _dbus_validate_bus_name_full (str, start, len, TRUE);
}
dbus_bool_t
_dbus_validate_signature (const DBusString *str,
int start,
int len)
{
_dbus_assert (start >= 0);
_dbus_assert (start <= _dbus_string_get_length (str));
_dbus_assert (len >= 0);
if (len > _dbus_string_get_length (str) - start)
return FALSE;
return _dbus_validate_signature_with_reason (str, start, len) == DBUS_VALID;
}
DEFINE_DBUS_NAME_CHECK(path)
DEFINE_DBUS_NAME_CHECK(interface)
DEFINE_DBUS_NAME_CHECK(member)
DEFINE_DBUS_NAME_CHECK(error_name)
DEFINE_DBUS_NAME_CHECK(bus_name)
DEFINE_DBUS_NAME_CHECK(signature)
DEFINE_DBUS_NAME_CHECK(utf8)
/* tests in dbus-marshal-validate-util.c */