1 files changed, 75 insertions, 0 deletions
diff --git a/dnsdist-dynbpf.hh b/dnsdist-dynbpf.hh
new file mode 100644
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--- /dev/null
+++ b/dnsdist-dynbpf.hh
@@ -0,0 +1,75 @@
+/*
+ * This file is part of PowerDNS or dnsdist.
+ * Copyright -- PowerDNS.COM B.V. and its contributors
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * In addition, for the avoidance of any doubt, permission is granted to
+ * link this program with OpenSSL and to (re)distribute the binaries
+ * produced as the result of such linking.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+#pragma once
+#include "config.h"
+
+#include "bpf-filter.hh"
+#include "iputils.hh"
+
+#include <boost/multi_index_container.hpp>
+#include <boost/multi_index/ordered_index.hpp>
+
+class DynBPFFilter
+{
+public:
+  DynBPFFilter(std::shared_ptr<BPFFilter>& bpf)
+  {
+    d_data.lock()->d_bpf = bpf;
+  }
+  ~DynBPFFilter()
+  {
+  }
+  void excludeRange(const Netmask& range)
+  {
+    d_data.lock()->d_excludedSubnets.addMask(range);
+  }
+  void includeRange(const Netmask& range)
+  {
+    d_data.lock()->d_excludedSubnets.addMask(range, false);
+  }
+  /* returns true if the addr wasn't already blocked, false otherwise */
+  bool block(const ComboAddress& addr, const struct timespec& until);
+  void purgeExpired(const struct timespec& now);
+  std::vector<std::tuple<ComboAddress, uint64_t, struct timespec> > getAddrStats();
+private:
+  struct BlockEntry
+  {
+    BlockEntry(const ComboAddress& addr, const struct timespec until): d_addr(addr), d_until(until)
+    {
+    }
+    ComboAddress d_addr;
+    struct timespec d_until;
+  };
+  typedef multi_index_container<BlockEntry,
+                                indexed_by <
+                                  ordered_unique< member<BlockEntry,ComboAddress,&BlockEntry::d_addr>, ComboAddress::addressOnlyLessThan >,
+                                  ordered_non_unique< member<BlockEntry,struct timespec,&BlockEntry::d_until> >
+                                  >
+                                > container_t;
+  struct Data {
+    container_t d_entries;
+    std::shared_ptr<BPFFilter> d_bpf{nullptr};
+    NetmaskGroup d_excludedSubnets;
+  };
+  LockGuarded<Data> d_data;
+};
+