1 files changed, 132 insertions, 0 deletions
diff --git a/src/lib/dhcp/option6_auth.cc b/src/lib/dhcp/option6_auth.cc
new file mode 100644
index 0000000..b859886
--- /dev/null
+++ b/src/lib/dhcp/option6_auth.cc
@@ -0,0 +1,132 @@
+// Copyright (C) 2018-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <dhcp/dhcp6.h>
+#include <dhcp/libdhcp++.h>
+#include <dhcp/option6_auth.h>
+#include <dhcp/option_space.h>
+#include <exceptions/exceptions.h>
+#include <util/io_utilities.h>
+#include <util/encode/hex.h>
+
+#include <sstream>
+#include <stdint.h>
+
+using namespace std;
+using namespace isc::util;
+
+namespace isc {
+namespace dhcp {
+
+    Option6Auth::Option6Auth(const uint8_t proto, const uint8_t algo,
+                             const uint8_t method, const uint64_t rdm,
+                             const std::vector<uint8_t>& info)
+    : Option(Option::V6, D6O_AUTH),
+      protocol_(proto), algorithm_(algo),
+      rdm_method_(method), rdm_value_(rdm),
+      auth_info_(info) {
+}
+
+OptionPtr
+Option6Auth::clone() const {
+    return (cloneInternal<Option6Auth>());
+}
+
+void
+Option6Auth::pack(isc::util::OutputBuffer& buf, bool) const {
+    if (buf.getCapacity() < (OPTION6_AUTH_MIN_LEN + OPTION6_HASH_MSG_LEN + OPTION6_HDR)) {
+       isc_throw(OutOfRange, "Option " << type_ << "Buffer too small for"
+               "packing data");
+    }
+
+    //header = option code + length
+    buf.writeUint16(type_);
+    // length = 11 bytes fixed field length+ length of auth information
+    buf.writeUint16(11 + uint16_t(auth_info_.size()));
+    // protocol 1 byte
+    buf.writeUint8(protocol_);
+    // algorithm 1 byte
+    buf.writeUint8(algorithm_);
+    // replay detection method
+    buf.writeUint8(rdm_method_);
+    // replay detection value
+    buf.writeUint64( rdm_value_);
+    // authentication information for reconfig msg
+    // should have zero
+
+    for (auto i : auth_info_) {
+        buf.writeUint8(i);
+    }
+}
+
+void
+Option6Auth::packHashInput(isc::util::OutputBuffer& buf) const {
+    if (buf.getCapacity() < (OPTION6_AUTH_MIN_LEN + OPTION6_HASH_MSG_LEN + OPTION6_HDR)) {
+       isc_throw(OutOfRange, "Option " << type_ << "Buffer too small for"
+               "computing hash input");
+    }
+
+    //header = option code + length
+    buf.writeUint16(type_);
+    // length = 11 bytes fixed field length+ length of auth information
+    buf.writeUint16(OPTION6_AUTH_MIN_LEN + OPTION6_HASH_MSG_LEN);
+    // protocol 1 byte
+    buf.writeUint8(protocol_);
+    // algorithm 1 byte
+    buf.writeUint8(algorithm_);
+    // replay detection method
+    buf.writeUint8(rdm_method_);
+    // replay detection value
+    buf.writeUint64(rdm_value_);
+    // authentication information for reconfig msg
+    // should have zero
+    for (uint8_t i = 0; i < OPTION6_HASH_MSG_LEN; i++) {
+        buf.writeUint8(0);
+    }
+}
+
+void
+Option6Auth::unpack(OptionBufferConstIter begin,
+                     OptionBufferConstIter end) {
+   // throw if it contains length less than minimum size of the auth option
+   if (distance(begin, end) < Option6Auth::OPTION6_AUTH_MIN_LEN) {
+       isc_throw(OutOfRange, "Option " << type_ << " truncated");
+   }
+
+   protocol_ = *begin;
+   begin += sizeof(uint8_t);
+
+   algorithm_ = *begin;
+   begin += sizeof(uint8_t);
+
+   rdm_method_ = *begin;
+   begin += sizeof(uint8_t);
+
+   rdm_value_ =  isc::util::readUint64(&(*begin), sizeof(uint64_t));
+   begin += sizeof(uint64_t);
+
+   auth_info_.erase(auth_info_.begin(), auth_info_.end());
+   std::for_each(begin, end, [this](uint8_t msgdata)
+                {  auth_info_.push_back(msgdata); });
+}
+
+std::string
+Option6Auth::toText(int indent) const {
+    stringstream output;
+    std::string in(indent, ' '); //base indent
+
+    output << in << "protocol=" << static_cast<int>(protocol_)
+           << ", algorithm=" << static_cast<int>(algorithm_)
+           << ", rdm method=" << static_cast<int>(rdm_method_)
+           << ", rdm value=" << rdm_value_
+           << ", value=" << isc::util::encode::encodeHex(auth_info_);
+
+    return output.str();
+}
+
+} // end  namespace dhcp
+} // end namespace isc