2013-12-27 05:28:25 +01:00
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/*
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Copyright (c) 2013, Steven Siloti
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the distribution.
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* Neither the name of the author nor the names of its
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef LIBTORRENT_ITEM_HPP
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#define LIBTORRENT_ITEM_HPP
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#include <libtorrent/sha1_hash.hpp>
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#include <libtorrent/lazy_entry.hpp>
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#include <libtorrent/entry.hpp>
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#include <vector>
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#include <exception>
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2014-02-24 01:31:13 +01:00
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#include <boost/array.hpp>
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2013-12-27 05:28:25 +01:00
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namespace libtorrent { namespace dht
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{
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2014-03-03 00:35:35 +01:00
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// calculate the target hash for an immutable item.
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2014-01-03 05:18:46 +01:00
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sha1_hash TORRENT_EXTRA_EXPORT item_target_id(
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std::pair<char const*, int> v);
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// calculate the target hash for a mutable item.
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sha1_hash TORRENT_EXTRA_EXPORT item_target_id(std::pair<char const*, int> salt
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, char const* pk);
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bool TORRENT_EXTRA_EXPORT verify_mutable_item(
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std::pair<char const*, int> v
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, std::pair<char const*, int> salt
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, boost::uint64_t seq
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, char const* pk
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, char const* sig);
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2013-12-27 05:28:25 +01:00
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2014-02-24 01:31:13 +01:00
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// TODO: since this is a public function, it should probably be moved
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// out of this header and into one with other public functions.
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// given a byte range ``v`` and an optional byte range ``salt``, a
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// sequence number, public key ``pk`` (must be 32 bytes) and a secret key
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// ``sk`` (must be 64 bytes), this function produces a signature which
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// is written into a 64 byte buffer pointed to by ``sig``. The caller
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// is responsible for allocating the destination buffer that's passed in
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// as the ``sig`` argument. Typically it would be allocated on the stack.
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void TORRENT_EXPORT sign_mutable_item(
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std::pair<char const*, int> v
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, std::pair<char const*, int> salt
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, boost::uint64_t seq
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, char const* pk
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, char const* sk
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, char* sig);
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2014-01-03 05:18:46 +01:00
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sha1_hash TORRENT_EXTRA_EXPORT mutable_item_cas(
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std::pair<char const*, int> v
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, std::pair<char const*, int> salt
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, boost::uint64_t seq);
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struct TORRENT_EXTRA_EXPORT invalid_item : std::exception
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{
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virtual const char* what() const throw() { return "invalid DHT item"; }
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};
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enum
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{
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item_pk_len = 32,
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item_sk_len = 64,
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item_sig_len = 64
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};
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class TORRENT_EXTRA_EXPORT item
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{
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public:
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item() : m_seq(0), m_mutable(false) {}
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item(char const* pk, std::string const& salt);
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item(entry const& v) { assign(v); }
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item(entry const& v
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, std::pair<char const*, int> salt
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, boost::uint64_t seq, char const* pk, char const* sk);
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item(lazy_entry const* v) { assign(v); }
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item(lazy_entry const* v, std::pair<char const*, int> salt
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, boost::uint64_t seq, char const* pk, char const* sig);
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void assign(entry const& v)
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{
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assign(v, std::pair<char const*, int>(static_cast<char const*>(NULL)
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, 0), 0, NULL, NULL);
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}
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void assign(entry const& v, std::pair<char const*, int> salt
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, boost::uint64_t seq, char const* pk, char const* sk);
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void assign(lazy_entry const* v)
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{
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assign(v, std::pair<char const*, int>(static_cast<char const*>(NULL)
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, 0), 0, NULL, NULL);
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}
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bool assign(lazy_entry const* v, std::pair<char const*, int> salt
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, boost::uint64_t seq, char const* pk, char const* sig);
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void assign(entry const& v, std::string salt, boost::uint64_t seq
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, char const* pk, char const* sig);
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void clear() { m_value = entry(); }
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bool empty() const { return m_value.type() == entry::undefined_t; }
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bool is_mutable() const { return m_mutable; }
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sha1_hash cas();
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entry const& value() const { return m_value; }
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boost::array<char, item_pk_len> const& pk() const
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{ return m_pk; }
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boost::array<char, item_sig_len> const& sig() const
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{ return m_sig; }
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boost::uint64_t seq() const { return m_seq; }
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std::string const& salt() const { return m_salt; }
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private:
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entry m_value;
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std::string m_salt;
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boost::array<char, item_pk_len> m_pk;
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boost::array<char, item_sig_len> m_sig;
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boost::uint64_t m_seq;
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bool m_mutable;
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};
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} } // namespace libtorrent::dht
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#endif // LIBTORRENT_ITEM_HPP
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