Jethro Grassie
5 years ago
parent
31bdf7bd11
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123fc2a25a
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// Copyright (c) 2019, The Monero Project
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//
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without modification, are
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// permitted provided that the following conditions are met:
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//
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// 1. Redistributions of source code must retain the above copyright notice, this list of
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// conditions and the following disclaimer.
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//
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// 2. Redistributions in binary form must reproduce the above copyright notice, this list
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// of conditions and the following disclaimer in the documentation and/or other
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// materials provided with the distribution.
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//
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// 3. Neither the name of the copyright holder nor the names of its contributors may be
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// used to endorse or promote products derived from this software without specific
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// prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
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// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF 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 CONTRACT,
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// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#include "i2p_address.h"
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#include <algorithm>
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#include <boost/spirit/include/karma_generate.hpp>
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#include <boost/spirit/include/karma_uint.hpp>
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#include <cassert>
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#include <cstring>
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#include <limits>
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#include "net/error.h"
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#include "serialization/keyvalue_serialization.h"
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#include "storages/portable_storage.h"
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#include "string_tools.h"
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namespace net
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{
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namespace
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{
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// !TODO only b32 addresses right now
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constexpr const char tld[] = u8".b32.i2p";
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constexpr const char unknown_host[] = "<unknown i2p host>";
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constexpr const unsigned b32_length = 52;
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constexpr const char base32_alphabet[] =
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u8"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz234567";
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expect<void> host_check(boost::string_ref host) noexcept
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{
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if (!host.ends_with(tld))
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return {net::error::expected_tld};
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host.remove_suffix(sizeof(tld) - 1);
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if (host.size() != b32_length)
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return {net::error::invalid_i2p_address};
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if (host.find_first_not_of(base32_alphabet) != boost::string_ref::npos)
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return {net::error::invalid_i2p_address};
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return success();
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}
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struct i2p_serialized
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{
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std::string host;
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std::uint16_t port;
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BEGIN_KV_SERIALIZE_MAP()
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KV_SERIALIZE(host)
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KV_SERIALIZE(port)
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END_KV_SERIALIZE_MAP()
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};
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}
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i2p_address::i2p_address(const boost::string_ref host, const std::uint16_t port) noexcept
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: port_(port)
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{
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// this is a private constructor, throw if moved to public
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assert(host.size() < sizeof(host_));
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const std::size_t length = std::min(sizeof(host_) - 1, host.size());
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std::memcpy(host_, host.data(), length);
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std::memset(host_ + length, 0, sizeof(host_) - length);
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}
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const char* i2p_address::unknown_str() noexcept
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{
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return unknown_host;
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}
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i2p_address::i2p_address() noexcept
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: port_(0)
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{
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static_assert(sizeof(unknown_host) <= sizeof(host_), "bad buffer size");
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std::memcpy(host_, unknown_host, sizeof(unknown_host));
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std::memset(host_ + sizeof(unknown_host), 0, sizeof(host_) - sizeof(unknown_host));
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}
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expect<i2p_address> i2p_address::make(const boost::string_ref address, const std::uint16_t default_port)
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{
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boost::string_ref host = address.substr(0, address.rfind(':'));
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const boost::string_ref port =
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address.substr(host.size() + (host.size() == address.size() ? 0 : 1));
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MONERO_CHECK(host_check(host));
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std::uint16_t porti = default_port;
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if (!port.empty() && !epee::string_tools::get_xtype_from_string(porti, std::string{port}))
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return {net::error::invalid_port};
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static_assert(b32_length + sizeof(tld) == sizeof(i2p_address::host_), "bad internal host size");
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return i2p_address{host, porti};
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}
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bool i2p_address::_load(epee::serialization::portable_storage& src, epee::serialization::section* hparent)
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{
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i2p_serialized in{};
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if (in._load(src, hparent) && in.host.size() < sizeof(host_) && (in.host == unknown_host || !host_check(in.host).has_error()))
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{
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std::memcpy(host_, in.host.data(), in.host.size());
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std::memset(host_ + in.host.size(), 0, sizeof(host_) - in.host.size());
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port_ = in.port;
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return true;
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}
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static_assert(sizeof(unknown_host) <= sizeof(host_), "bad buffer size");
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std::memcpy(host_, unknown_host, sizeof(unknown_host)); // include null terminator
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port_ = 0;
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return false;
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}
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bool i2p_address::store(epee::serialization::portable_storage& dest, epee::serialization::section* hparent) const
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{
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const i2p_serialized out{std::string{host_}, port_};
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return out.store(dest, hparent);
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}
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i2p_address::i2p_address(const i2p_address& rhs) noexcept
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: port_(rhs.port_)
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{
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std::memcpy(host_, rhs.host_, sizeof(host_));
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}
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i2p_address& i2p_address::operator=(const i2p_address& rhs) noexcept
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{
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if (this != std::addressof(rhs))
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{
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port_ = rhs.port_;
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std::memcpy(host_, rhs.host_, sizeof(host_));
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}
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return *this;
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}
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bool i2p_address::is_unknown() const noexcept
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{
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static_assert(1 <= sizeof(host_), "host size too small");
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return host_[0] == '<'; // character is not allowed otherwise
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}
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bool i2p_address::equal(const i2p_address& rhs) const noexcept
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{
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return port_ == rhs.port_ && is_same_host(rhs);
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}
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bool i2p_address::less(const i2p_address& rhs) const noexcept
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{
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return std::strcmp(host_str(), rhs.host_str()) < 0 || port() < rhs.port();
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}
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bool i2p_address::is_same_host(const i2p_address& rhs) const noexcept
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{
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return std::strcmp(host_str(), rhs.host_str()) == 0;
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}
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std::string i2p_address::str() const
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{
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const std::size_t host_length = std::strlen(host_str());
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const std::size_t port_length =
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port_ == 0 ? 0 : std::numeric_limits<std::uint16_t>::digits10 + 2;
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std::string out{};
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out.reserve(host_length + port_length);
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out.assign(host_str(), host_length);
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if (port_ != 0)
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{
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out.push_back(':');
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namespace karma = boost::spirit::karma;
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karma::generate(std::back_inserter(out), karma::ushort_, port());
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}
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return out;
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}
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}
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@ -0,0 +1,140 @@
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// Copyright (c) 2019, The Monero Project
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//
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without modification, are
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// permitted provided that the following conditions are met:
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//
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// 1. Redistributions of source code must retain the above copyright notice, this list of
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// conditions and the following disclaimer.
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//
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// 2. Redistributions in binary form must reproduce the above copyright notice, this list
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// of conditions and the following disclaimer in the documentation and/or other
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// materials provided with the distribution.
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//
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// 3. Neither the name of the copyright holder nor the names of its contributors may be
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// used to endorse or promote products derived from this software without specific
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// prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
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// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF 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 CONTRACT,
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// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#pragma once
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#include <boost/utility/string_ref.hpp>
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#include <cstdint>
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#include <string>
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#include "common/expect.h"
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#include "net/enums.h"
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#include "net/error.h"
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namespace epee
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{
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namespace serialization
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{
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class portable_storage;
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struct section;
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}
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}
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namespace net
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{
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//! b32 i2p address; internal format not condensed/decoded.
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class i2p_address
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{
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std::uint16_t port_;
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char host_[61]; // null-terminated
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//! Keep in private, `host.size()` has no runtime check
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i2p_address(boost::string_ref host, std::uint16_t port) noexcept;
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public:
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//! \return Size of internal buffer for host.
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static constexpr std::size_t buffer_size() noexcept { return sizeof(host_); }
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//! \return `<unknown tor host>`.
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static const char* unknown_str() noexcept;
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//! An object with `port() == 0` and `host_str() == unknown_str()`.
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i2p_address() noexcept;
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//! \return A default constructed `i2p_address` object.
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static i2p_address unknown() noexcept { return i2p_address{}; }
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/*!
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Parse `address` in b32 i2p format (i.e. x.b32.i2p:80)
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with `default_port` being used if port is not specified in
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`address`.
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*/
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static expect<i2p_address> make(boost::string_ref address, std::uint16_t default_port = 0);
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//! Load from epee p2p format, and \return false if not valid tor address
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bool _load(epee::serialization::portable_storage& src, epee::serialization::section* hparent);
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//! Store in epee p2p format
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bool store(epee::serialization::portable_storage& dest, epee::serialization::section* hparent) const;
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// Moves and copies are currently identical
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i2p_address(const i2p_address& rhs) noexcept;
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~i2p_address() = default;
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i2p_address& operator=(const i2p_address& rhs) noexcept;
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//! \return True if default constructed or via `unknown()`.
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bool is_unknown() const noexcept;
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bool equal(const i2p_address& rhs) const noexcept;
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bool less(const i2p_address& rhs) const noexcept;
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//! \return True if i2p addresses are identical.
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bool is_same_host(const i2p_address& rhs) const noexcept;
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//! \return `x.b32.i2p` or `x.b32.i2p:z` if `port() != 0`.
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std::string str() const;
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//! \return Null-terminated `x.b32.i2p` value or `unknown_str()`.
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const char* host_str() const noexcept { return host_; }
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//! \return Port value or `0` if unspecified.
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std::uint16_t port() const noexcept { return port_; }
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static constexpr bool is_loopback() noexcept { return false; }
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static constexpr bool is_local() noexcept { return false; }
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static constexpr epee::net_utils::address_type get_type_id() noexcept
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{
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return epee::net_utils::address_type::i2p;
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}
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static constexpr epee::net_utils::zone get_zone() noexcept
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{
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return epee::net_utils::zone::i2p;
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}
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//! \return `!is_unknown()`.
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bool is_blockable() const noexcept { return !is_unknown(); }
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};
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inline bool operator==(const i2p_address& lhs, const i2p_address& rhs) noexcept
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{
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return lhs.equal(rhs);
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}
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inline bool operator!=(const i2p_address& lhs, const i2p_address& rhs) noexcept
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{
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return !lhs.equal(rhs);
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}
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inline bool operator<(const i2p_address& lhs, const i2p_address& rhs) noexcept
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{
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return lhs.less(rhs);
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}
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} // net
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