Merge commit '86cc97e55fe346502462284d2e636a2b3708163e' as 'Sources/OpenVPN3'

2026-04-24 00:00:05 +08:00 · 2020-02-24 14:43:11 +03:00
parent 133b3756e6 86cc97e55f
commit 32f1555929
655 changed files with 146468 additions and 0 deletions
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+//    OpenVPN -- An application to securely tunnel IP networks
+//               over a single port, with support for SSL/TLS-based
+//               session authentication and key exchange,
+//               packet encryption, packet authentication, and
+//               packet compression.
+//
+//    Copyright (C) 2012-2017 OpenVPN Inc.
+//
+//    This program is free software: you can redistribute it and/or modify
+//    it under the terms of the GNU Affero General Public License Version 3
+//    as published by the Free Software Foundation.
+//
+//    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 Affero General Public License for more details.
+//
+//    You should have received a copy of the GNU Affero General Public License
+//    along with this program in the COPYING file.
+//    If not, see <http://www.gnu.org/licenses/>.
+
+// Handle pushed option list "continuations".  This is where multiple
+// option lists are pushed by the server, if an option list doesn't fit
+// into the standard 1024 byte buffer.  This class will aggregate the
+// options.
+
+#ifndef OPENVPN_OPTIONS_CONTINUATION_H
+#define OPENVPN_OPTIONS_CONTINUATION_H
+
+#include <openvpn/common/exception.hpp>
+#include <openvpn/common/options.hpp>
+
+namespace openvpn {
+
+  struct PushOptionsBase : public RC<thread_unsafe_refcount>
+  {
+    typedef RCPtr<PushOptionsBase> Ptr;
+
+    OptionList multi;
+    OptionList singleton;
+  };
+
+  // Aggregate pushed option continuations into a singular option list.
+  // Note that map is not updated until list is complete.
+  class OptionListContinuation : public OptionList
+  {
+  public:
+    OPENVPN_SIMPLE_EXCEPTION(olc_complete); // add called when object is already complete
+
+    OptionListContinuation(const PushOptionsBase::Ptr& push_base_arg)
+      : partial_(false),
+	complete_(false),
+	push_base(push_base_arg)
+    {
+      // Prepend from base where multiple options of the same type can aggregate,
+      // so that server-pushed options will be at the end of list.
+      if (push_base)
+	extend(push_base->multi, nullptr);
+    }
+
+    // call with option list fragments
+    void add(const OptionList& other, OptionList::FilterBase* filt)
+    {
+      if (!complete_)
+	{
+	  partial_ = true;
+	  extend(other, filt);
+	  if (!continuation(other))
+	    {
+	      if (push_base)
+		{
+		  // Append from base where only a single instance of each option makes sense,
+		  // provided that option wasn't already pushed by server.
+		  update_map();
+		  extend_nonexistent(push_base->singleton);
+		}
+	      update_map();
+	      complete_ = true;
+	    }
+	}
+      else
+	throw olc_complete();
+    }
+
+    // returns true if add() was called at least once
+    bool partial() const { return partial_; }
+
+    // returns true if option list is complete
+    bool complete() const { return complete_; }
+
+  private:
+    static bool continuation(const OptionList& opt)
+    {
+      const Option *o = opt.get_ptr("push-continuation");
+      return o && o->size() >= 2 && o->ref(1) == "2";
+    }
+
+    bool partial_;
+    bool complete_;
+
+    PushOptionsBase::Ptr push_base;
+  };
+
+} // namespace openvpn
+
+#endif // OPENVPN_OPTIONS_CONTINUATION_H