|
|
@@ -0,0 +1,145 @@
|
|
|
+// Copyright (C) 2010 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 <stdint.h>
|
|
|
+#include <string.h>
|
|
|
+
|
|
|
+#include <string>
|
|
|
+
|
|
|
+#include <exceptions/exceptions.h>
|
|
|
+
|
|
|
+#include <util/buffer.h>
|
|
|
+#include <util/encode/hex.h>
|
|
|
+#include <dns/exceptions.h>
|
|
|
+#include <dns/messagerenderer.h>
|
|
|
+#include <dns/rdata.h>
|
|
|
+#include <dns/rdataclass.h>
|
|
|
+
|
|
|
+using namespace std;
|
|
|
+using namespace isc::util;
|
|
|
+
|
|
|
+// BEGIN_ISC_NAMESPACE
|
|
|
+// BEGIN_RDATA_NAMESPACE
|
|
|
+
|
|
|
+/// \brief Constructor from string.
|
|
|
+///
|
|
|
+/// \param dhcid_str A base-64 representation of the DHCID binary data.
|
|
|
+/// The data is considered to be opaque, but a sanity check is performed.
|
|
|
+///
|
|
|
+/// <b>Exceptions</b>
|
|
|
+///
|
|
|
+/// \c dhcid_str must be a valid BASE-64 string, otherwise an exception
|
|
|
+/// of class \c isc::BadValue will be thrown;
|
|
|
+/// the binary data should consist of at leat of 3 octets as per RFC4701:
|
|
|
+/// < 2 octets > Identifier type code
|
|
|
+/// < 1 octet > Digest type code
|
|
|
+/// < n octets > Digest (length depends on digest type)
|
|
|
+/// If the data is less than 3 octets (i.e. it cannot contain id type code and
|
|
|
+/// digest type code), an exception of class \c InvalidRdataLength is thrown.
|
|
|
+DHCID::DHCID(const string& dhcid_str) {
|
|
|
+ istringstream iss(dhcid_str);
|
|
|
+ stringbuf digestbuf;
|
|
|
+
|
|
|
+ iss >> &digestbuf;
|
|
|
+ isc::util::encode::decodeHex(digestbuf.str(), digest_);
|
|
|
+
|
|
|
+ // RFC4701 states DNS software should consider the RDATA section to
|
|
|
+ // be opaque, but there must be at least three bytes in the data:
|
|
|
+ // < 2 octets > Identifier type code
|
|
|
+ // < 1 octet > Digest type code
|
|
|
+ if (digest_.size() < 3) {
|
|
|
+ isc_throw(InvalidRdataLength, "DHCID length " << digest_.size() <<
|
|
|
+ " too short, need at least 3 bytes");
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+/// \brief Constructor from wire-format data.
|
|
|
+///
|
|
|
+/// \param buffer A buffer storing the wire format data.
|
|
|
+/// \param rdata_len The length of the RDATA in bytes
|
|
|
+///
|
|
|
+/// <b>Exceptions</b>
|
|
|
+/// \c InvalidRdataLength is thrown if \c rdata_len is than minimum of 3 octets
|
|
|
+DHCID::DHCID(InputBuffer& buffer, size_t rdata_len) {
|
|
|
+ if (rdata_len < 3) {
|
|
|
+ isc_throw(InvalidRdataLength, "DHCID length " << rdata_len <<
|
|
|
+ " too short, need at least 3 bytes");
|
|
|
+ }
|
|
|
+
|
|
|
+ digest_.resize(rdata_len);
|
|
|
+ buffer.readData(&digest_[0], rdata_len);
|
|
|
+}
|
|
|
+
|
|
|
+/// \brief The copy constructor.
|
|
|
+///
|
|
|
+/// This trivial copy constructor never throws an exception.
|
|
|
+DHCID::DHCID(const DHCID& other) : Rdata(), digest_(other.digest_)
|
|
|
+{}
|
|
|
+
|
|
|
+/// \brief Render the \c DHCID in the wire format.
|
|
|
+///
|
|
|
+/// \param buffer An output buffer to store the wire data.
|
|
|
+void
|
|
|
+DHCID::toWire(OutputBuffer& buffer) const {
|
|
|
+ buffer.writeData(&digest_[0], digest_.size());
|
|
|
+}
|
|
|
+
|
|
|
+/// \brief Render the \c DHCID in the wire format into a
|
|
|
+/// \c MessageRenderer object.
|
|
|
+///
|
|
|
+/// \param renderer DNS message rendering context that encapsulates the
|
|
|
+/// output buffer in which the \c DHCID is to be stored.
|
|
|
+void
|
|
|
+DHCID::toWire(AbstractMessageRenderer& renderer) const {
|
|
|
+ renderer.writeData(&digest_[0], digest_.size());
|
|
|
+}
|
|
|
+
|
|
|
+/// \brief Convert the \c DHCID to a string.
|
|
|
+///
|
|
|
+/// This method returns a \c std::string object representing the \c DHCID.
|
|
|
+///
|
|
|
+/// \return A string representation of \c DHCID.
|
|
|
+string
|
|
|
+DHCID::toText() const {
|
|
|
+ return (isc::util::encode::encodeHex(digest_));
|
|
|
+}
|
|
|
+
|
|
|
+/// \brief Compare two instances of \c DHCID RDATA.
|
|
|
+///
|
|
|
+/// See documentation in \c Rdata.
|
|
|
+int
|
|
|
+DHCID::compare(const Rdata& other) const {
|
|
|
+ const DHCID& other_dhcid = dynamic_cast<const DHCID&>(other);
|
|
|
+
|
|
|
+ size_t this_len = digest_.size();
|
|
|
+ size_t other_len = other_dhcid.digest_.size();
|
|
|
+ size_t cmplen = min(this_len, other_len);
|
|
|
+ int cmp = memcmp(&digest_[0], &other_dhcid.digest_[0], cmplen);
|
|
|
+ if (cmp != 0) {
|
|
|
+ return (cmp);
|
|
|
+ } else {
|
|
|
+ return ((this_len == other_len) ? 0 : (this_len < other_len) ? -1 : 1);
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+/// \brief Accessor method to get the DHCID digest
|
|
|
+///
|
|
|
+/// \return A reference to the binary DHCID data
|
|
|
+const std::vector<uint8_t>&
|
|
|
+DHCID::getDigest() const {
|
|
|
+ return (digest_);
|
|
|
+}
|
|
|
+
|
|
|
+// END_RDATA_NAMESPACE
|
|
|
+// END_ISC_NAMESPACE
|
Dima Volodin