mirror of
https://github.com/OpenVPN/openvpn3.git
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107 lines
3.2 KiB
C++
107 lines
3.2 KiB
C++
// OpenVPN -- An application to securely tunnel IP networks
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// over a single port, with support for SSL/TLS-based
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// session authentication and key exchange,
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// packet encryption, packet authentication, and
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// packet compression.
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//
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// Copyright (C) 2013-2014 OpenVPN Technologies, Inc.
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License Version 3
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// as published by the Free Software Foundation.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program in the COPYING file.
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// If not, see <http://www.gnu.org/licenses/>.
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// Handle pushed option list "continuations". This is where multiple
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// option lists are pushed by the server, if an option list doesn't fit
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// into the standard 1024 byte buffer. This class will aggregate the
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// options.
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#ifndef OPENVPN_OPTIONS_CONTINUATION_H
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#define OPENVPN_OPTIONS_CONTINUATION_H
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#include <openvpn/common/exception.hpp>
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#include <openvpn/common/options.hpp>
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namespace openvpn {
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struct PushOptionsBase : public RC<thread_unsafe_refcount>
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{
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typedef boost::intrusive_ptr<PushOptionsBase> Ptr;
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OptionList multi;
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OptionList singleton;
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};
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// Aggregate pushed option continuations into a singular option list.
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// Note that map is not updated until list is complete.
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class OptionListContinuation : public OptionList
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{
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public:
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OPENVPN_SIMPLE_EXCEPTION(olc_complete); // add called when object is already complete
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OptionListContinuation(const PushOptionsBase::Ptr& push_base_arg)
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: partial_(false),
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complete_(false),
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push_base(push_base_arg)
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{
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// Prepend from base where multiple options of the same type can aggregate,
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// so that server-pushed options will be at the end of list.
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if (push_base)
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extend(push_base->multi, NULL);
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}
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// call with option list fragments
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void add(const OptionList& other, OptionList::FilterBase* filt)
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{
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if (!complete_)
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{
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partial_ = true;
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extend(other, filt);
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if (!continuation(other))
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{
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if (push_base)
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{
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// Append from base where only a single instance of each option makes sense,
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// provided that option wasn't already pushed by server.
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update_map();
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extend_nonexistent(push_base->singleton);
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}
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update_map();
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complete_ = true;
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}
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}
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else
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throw olc_complete();
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}
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// returns true if add() was called at least once
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bool partial() const { return partial_; }
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// returns true if option list is complete
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bool complete() const { return complete_; }
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private:
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static bool continuation(const OptionList& opt)
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{
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const Option *o = opt.get_ptr("push-continuation");
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return o && o->size() >= 2 && o->ref(1) == "2";
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}
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bool partial_;
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bool complete_;
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PushOptionsBase::Ptr push_base;
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};
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} // namespace openvpn
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#endif // OPENVPN_OPTIONS_CONTINUATION_H
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