[1138] DHCID implementation

src/lib/dns/Makefile.am

@@ -23,6 +23,8 @@ EXTRA_DIST += rdata/generic/cname_5.cc
 EXTRA_DIST += rdata/generic/cname_5.h
 EXTRA_DIST += rdata/generic/detail/nsec_bitmap.cc
 EXTRA_DIST += rdata/generic/detail/nsec_bitmap.h
+EXTRA_DIST += rdata/generic/dhcid_49.cc
+EXTRA_DIST += rdata/generic/dhcid_49.h
 EXTRA_DIST += rdata/generic/dname_39.cc
 EXTRA_DIST += rdata/generic/dname_39.h
 EXTRA_DIST += rdata/generic/dnskey_48.cc

src/lib/dns/rdata/in_1/dhcid_49.cc

@@ -0,0 +1,94 @@
+// 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 <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
+
+DHCID::DHCID(const string& dhcid_str) {
+    istringstream iss(dhcid_str);
+    stringbuf digestbuf;
+
+    iss >> &digestbuf;
+    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");
+    }
+}
+
+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);
+}
+
+DHCID::DHCID(const DHCID& other) : Rdata(), digest_(other.digest_)
+{}
+
+void
+DHCID::toWire(OutputBuffer& buffer) const {
+    buffer.writeData(&digest_[0], digest_.size());
+}
+
+void
+DHCID::toWire(AbstractMessageRenderer& renderer) const {
+    renderer.writeData(&digest_[0], digest_.size());
+}
+
+string
+DHCID::toText() const {
+    return (encodeHex(digest_));
+}
+
+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);
+    }
+}
+// END_RDATA_NAMESPACE
+// END_ISC_NAMESPACE

src/lib/dns/rdata/in_1/dhcid_49.h

@@ -0,0 +1,45 @@
+// 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.
+
+// BEGIN_HEADER_GUARD
+
+#include <string>
+#include <vector>
+
+#include <dns/rdata.h>
+
+// BEGIN_ISC_NAMESPACE
+
+// BEGIN_COMMON_DECLARATIONS
+// END_COMMON_DECLARATIONS
+
+// BEGIN_RDATA_NAMESPACE
+
+class DHCID : public Rdata {
+public:
+    // BEGIN_COMMON_MEMBERS
+    // END_COMMON_MEMBERS
+
+    //We can use the default destructor.
+    //virtual ~DHCID() {}
+private:
+    std::vector<uint8_t> digest_;	// opaque data at least 3 octets long
+};
+// END_RDATA_NAMESPACE
+// END_ISC_NAMESPACE
+// END_HEADER_GUARD
+
+// Local Variables: 
+// mode: c++
+// End: