1 files changed, 83 insertions, 0 deletions
diff --git a/src/lib/dhcpsrv/allocator.cc b/src/lib/dhcpsrv/allocator.cc
new file mode 100644
index 0000000..5925689
--- /dev/null
+++ b/src/lib/dhcpsrv/allocator.cc
@@ -0,0 +1,83 @@
+// Copyright (C) 2022-2023 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 <dhcpsrv/allocator.h>
+#include <dhcpsrv/lease_mgr_factory.h>
+#include <dhcpsrv/dhcpsrv_log.h>
+
+using namespace isc::util;
+
+namespace isc {
+namespace dhcp {
+
+Allocator::Allocator(Lease::Type type, const WeakSubnetPtr& subnet)
+    : inited_(false),
+      pool_type_(type),
+      subnet_id_(0),
+      subnet_(subnet) {
+    // Remember subnet ID in a separate variable. It may be needed in
+    // the destructor where the subnet weak pointer is unavailable.
+    subnet_id_ = subnet_.lock()->getID();
+}
+
+Allocator::~Allocator() {
+    if (!LeaseMgrFactory::haveInstance()) {
+        // If there is no lease manager instance, the callbacks are
+        // gone already anyway.
+        return;
+    }
+    // Remove the callbacks.
+    auto& lease_mgr = LeaseMgrFactory::instance();
+    lease_mgr.unregisterCallbacks(subnet_id_, pool_type_);
+}
+
+bool
+Allocator::isValidPrefixPool(Allocator::PrefixLenMatchType prefix_length_match,
+                                  PoolPtr pool, uint8_t hint_prefix_length) {
+    auto pool6 = boost::dynamic_pointer_cast<Pool6>(pool);
+    if (!pool6) {
+        return (false);
+    }
+
+    if (!hint_prefix_length) {
+        return (true);
+    }
+
+    if (prefix_length_match == Allocator::PREFIX_LEN_EQUAL &&
+        pool6->getLength() != hint_prefix_length) {
+        return (false);
+    }
+
+    if (prefix_length_match == Allocator::PREFIX_LEN_LOWER &&
+        pool6->getLength() >= hint_prefix_length) {
+        return (false);
+    }
+
+    if (prefix_length_match == Allocator::PREFIX_LEN_HIGHER &&
+        pool6->getLength() <= hint_prefix_length) {
+        return (false);
+    }
+
+    return (true);
+}
+
+void
+Allocator::initAfterConfigure() {
+    if (inited_) {
+        return;
+    }
+    auto subnet = subnet_.lock();
+    LOG_INFO(dhcpsrv_logger, DHCPSRV_CFGMGR_USE_ALLOCATOR)
+        .arg(getType())
+        .arg(Lease::typeToText(pool_type_))
+        .arg(subnet->toText());
+    initAfterConfigureInternal();
+    inited_ = true;
+}
+
+}
+}