/**
* Checks that the given range of the string is a valid bus name in
* the D-Bus protocol. This includes a length restriction, etc., see
* the specification.
*
* @todo this is inconsistent with most of DBusString in that
* it allows a start,len range that extends past the string end.
*
* @param str the string
* @param start first byte index to check
* @param len number of bytes to check
* @returns #TRUE if the byte range exists and is a valid name
*/
dbus_bool_t
_dbus_validate_bus_name (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 (*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 (_DBUS_UNLIKELY (last_dot == NULL))
return FALSE;
return TRUE;
}
static gboolean
validate_bus_name (const char *name)
{
int len;
const char *s;
const char *end;
const char *last_dot;
gboolean ret;
s = name;
len = strlen (name);
end = name + len;
last_dot = NULL;
ret = FALSE;
/* 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 (G_UNLIKELY ((s + 1) == end))
goto error;
if (G_UNLIKELY (!VALID_BUS_NAME_CHARACTER (*(s + 1))))
goto error;
++s; /* we just validated the next char, so skip two */
} else if (G_UNLIKELY (!VALID_BUS_NAME_CHARACTER (*s))) {
goto error;
}
++s;
}
return TRUE;
} else if (G_UNLIKELY (*s == '.')) /* disallow starting with a . */ {
goto error;
} else if (G_UNLIKELY (!VALID_INITIAL_BUS_NAME_CHARACTER (*s))) {
goto error;
} else {
++s;
}
while (s != end) {
if (*s == '.') {
if (G_UNLIKELY ((s + 1) == end))
goto error;
else if (G_UNLIKELY (!VALID_INITIAL_BUS_NAME_CHARACTER (*(s + 1))))
goto error;
last_dot = s;
++s; /* we just validated the next char, so skip two */
} else if (G_UNLIKELY (!VALID_BUS_NAME_CHARACTER (*s))) {
goto error;
}
++s;
}
if (G_UNLIKELY (last_dot == NULL))
goto error;
ret = TRUE;
error:
if (!ret)
HAL_INFO (("name '%s' did not validate", name));
return ret;
}
