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ISC Open Source Projects
Kea
Commits
f957fa65
Commit
f957fa65
authored
Nov 26, 2012
by
Marcin Siodelski
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[2312] Added utility class to write data of various types to a buffer.
parent
08d0d10d
Changes
3
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3 changed files
with
156 additions
and
1 deletion
+156
-1
src/lib/dhcp/Makefile.am
src/lib/dhcp/Makefile.am
+1
-1
src/lib/dhcp/option_data_types.cc
src/lib/dhcp/option_data_types.cc
+85
-0
src/lib/dhcp/option_data_types.h
src/lib/dhcp/option_data_types.h
+70
-0
No files found.
src/lib/dhcp/Makefile.am
View file @
f957fa65
...
...
@@ -21,7 +21,7 @@ libb10_dhcp___la_SOURCES += iface_mgr_linux.cc
libb10_dhcp___la_SOURCES
+=
iface_mgr_sun.cc
libb10_dhcp___la_SOURCES
+=
libdhcp++.cc libdhcp++.h
libb10_dhcp___la_SOURCES
+=
option.cc option.h
libb10_dhcp___la_SOURCES
+=
option_data_types.h
libb10_dhcp___la_SOURCES
+=
option_data_types.
cc option_data_types.
h
libb10_dhcp___la_SOURCES
+=
option_definition.cc option_definition.h
libb10_dhcp___la_SOURCES
+=
option_custom.cc option_custom.h
libb10_dhcp___la_SOURCES
+=
option6_ia.cc option6_ia.h
...
...
src/lib/dhcp/option_data_types.cc
0 → 100644
View file @
f957fa65
// Copyright (C) 2012 Internet Systems Consortium, Inc. ("ISC")
//
// Permission to use, copy, modify, and/or 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 ISC DISCLAIMS ALL WARRANTIES WITH
// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
// AND FITNESS. IN NO EVENT SHALL ISC 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.
#include <dhcp/option_data_types.h>
#include <util/encode/hex.h>
namespace
isc
{
namespace
dhcp
{
void
OptionDataTypeUtil
::
writeBinary
(
const
std
::
string
&
hex_str
,
std
::
vector
<
uint8_t
>&
buf
)
{
// Binary value means that the value is encoded as a string
// of hexadecimal deigits. We need to decode this string
// to the binary format here.
OptionBuffer
binary
;
try
{
util
::
encode
::
decodeHex
(
hex_str
,
binary
);
}
catch
(
const
Exception
&
ex
)
{
isc_throw
(
BadDataTypeCast
,
"unable to cast "
<<
hex_str
<<
" to binary data type: "
<<
ex
.
what
());
}
// Decode was successful so append decoded binary value
// to the buffer.
buf
.
insert
(
buf
.
end
(),
binary
.
begin
(),
binary
.
end
());
}
void
OptionDataTypeUtil
::
writeBool
(
const
bool
value
,
std
::
vector
<
uint8_t
>&
buf
)
{
if
(
value
)
{
buf
.
push_back
(
static_cast
<
uint8_t
>
(
1
));
}
else
{
buf
.
push_back
(
static_cast
<
uint8_t
>
(
0
));
}
}
void
OptionDataTypeUtil
::
writeAddress
(
const
asiolink
::
IOAddress
&
address
,
std
::
vector
<
uint8_t
>&
buf
)
{
if
(
address
.
getAddress
().
is_v4
())
{
asio
::
ip
::
address_v4
::
bytes_type
addr_bytes
=
address
.
getAddress
().
to_v4
().
to_bytes
();
// Increase the buffer size by the size of IPv4 address.
buf
.
resize
(
buf
.
size
()
+
addr_bytes
.
size
());
std
::
copy_backward
(
addr_bytes
.
begin
(),
addr_bytes
.
end
(),
buf
.
end
());
}
else
if
(
address
.
getAddress
().
is_v6
())
{
asio
::
ip
::
address_v6
::
bytes_type
addr_bytes
=
address
.
getAddress
().
to_v6
().
to_bytes
();
// Incresase the buffer size by the size of IPv6 address.
buf
.
resize
(
buf
.
size
()
+
addr_bytes
.
size
());
std
::
copy_backward
(
addr_bytes
.
begin
(),
addr_bytes
.
end
(),
buf
.
end
());
}
else
{
isc_throw
(
BadDataTypeCast
,
"the address "
<<
address
.
toText
()
<<
" is neither valid IPv4 not IPv6 address."
);
}
}
void
OptionDataTypeUtil
::
writeString
(
const
std
::
string
&
value
,
std
::
vector
<
uint8_t
>&
buf
)
{
if
(
value
.
size
()
>
0
)
{
// Increase the size of the storage by the size of the string.
buf
.
resize
(
buf
.
size
()
+
value
.
size
());
// Assuming that the string is already UTF8 encoded.
std
::
copy_backward
(
value
.
c_str
(),
value
.
c_str
()
+
value
.
size
(),
buf
.
end
());
}
}
}
// end of isc::dhcp namespace
}
// end of isc namespace
src/lib/dhcp/option_data_types.h
View file @
f957fa65
...
...
@@ -16,7 +16,9 @@
#define OPTION_DATA_TYPES_H
#include <asiolink/io_address.h>
#include <dhcp/option.h>
#include <exceptions/exceptions.h>
#include <util/io_utilities.h>
#include <stdint.h>
...
...
@@ -172,6 +174,74 @@ struct OptionDataTypeTraits<std::string> {
static
const
OptionDataType
type
=
OPT_STRING_TYPE
;
};
/// @brief Utility class to write/read data to/from a buffer.
class
OptionDataTypeUtil
{
public:
/// @brief Write IPv4 or IPv6 address into a buffer.
///
/// @param address IPv4 or IPv6 address.
/// @param [out] buf output buffer.
static
void
writeAddress
(
const
asiolink
::
IOAddress
&
address
,
std
::
vector
<
uint8_t
>&
buf
);
/// @brief Write hex-encoded binary values into a buffer.
///
/// @param hex_str string representing a binary value encoded
/// with hexadecimal digits (without 0x prefix).
/// @param [out] output buffer.
static
void
writeBinary
(
const
std
::
string
&
hex_str
,
std
::
vector
<
uint8_t
>&
buf
);
/// @brief Write boolean value into a buffer.
///
/// The bool value is encoded in a buffer in such a way that
/// "1" means "true" and "0" means "false".
///
/// @param boolean value to be written.
/// @param [out] buf output buffer.
static
void
writeBool
(
const
bool
value
,
std
::
vector
<
uint8_t
>&
buf
);
/// @brief Write integer or unsiged integer value into a buffer.
///
/// @param value an integer value to be written into a buffer.
/// @param [out] buf output buffer.
/// @tparam data type of the value.
template
<
typename
T
>
static
void
writeInt
(
const
T
value
,
std
::
vector
<
uint8_t
>&
buf
)
{
if
(
!
OptionDataTypeTraits
<
T
>::
is_integer
)
{
isc_throw
(
InvalidDataType
,
"provided data type is not the supported."
);
}
switch
(
OptionDataTypeTraits
<
T
>::
len
)
{
case
1
:
buf
.
push_back
(
static_cast
<
uint8_t
>
(
value
));
break
;
case
2
:
buf
.
resize
(
buf
.
size
()
+
2
);
isc
::
util
::
writeUint16
(
static_cast
<
uint16_t
>
(
value
),
&
buf
[
buf
.
size
()
-
2
]);
break
;
case
4
:
buf
.
resize
(
buf
.
size
()
+
4
);
isc
::
util
::
writeUint32
(
static_cast
<
uint32_t
>
(
value
),
&
buf
[
buf
.
size
()
-
4
]);
break
;
default:
// The cases above cover whole range of possible data lengths because
// we check at the beginning of this function that given data type is
// a supported integer type which can be only 1,2 or 4 bytes long.
;
}
}
/// @brief Write utf8-encoded string into a buffer.
///
/// @param value string value to be written into a buffer.
/// @param [out] buf output buffer.
static
void
writeString
(
const
std
::
string
&
value
,
std
::
vector
<
uint8_t
>&
buf
);
};
}
// isc::dhcp namespace
}
// isc namespace
...
...
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