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// Copyright (c) 2018, The Monero Project
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this list of
// conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice, this list
// of conditions and the following disclaimer in the documentation and/or other
// materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its contributors may be
// used to endorse or promote products derived from this software without specific
// prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "tor_address.h"
#include <algorithm>
#include <boost/spirit/include/karma_generate.hpp>
#include <boost/spirit/include/karma_uint.hpp>
#include <cassert>
#include <cstring>
#include <limits>
#include "net/error.h"
#include "serialization/keyvalue_serialization.h"
#include "storages/portable_storage.h"
#include "string_tools.h"
namespace net
{
namespace
{
constexpr const char tld[] = u8".onion";
constexpr const char unknown_host[] = "<unknown tor host>";
constexpr const unsigned v2_length = 16;
constexpr const unsigned v3_length = 56;
constexpr const char base32_alphabet[] =
u8"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz234567";
expect<void> host_check(boost::string_ref host) noexcept
{
if (!host.ends_with(tld))
return {net::error::expected_tld};
host.remove_suffix(sizeof(tld) - 1);
//! \TODO v3 has checksum, base32 decoding is required to verify it
if (host.size() != v2_length && host.size() != v3_length)
return {net::error::invalid_tor_address};
if (host.find_first_not_of(base32_alphabet) != boost::string_ref::npos)
return {net::error::invalid_tor_address};
return success();
}
struct tor_serialized
{
std::string host;
std::uint16_t port;
BEGIN_KV_SERIALIZE_MAP()
KV_SERIALIZE(host)
KV_SERIALIZE(port)
END_KV_SERIALIZE_MAP()
};
}
tor_address::tor_address(const boost::string_ref host, const std::uint16_t port) noexcept
: port_(port)
{
// this is a private constructor, throw if moved to public
assert(host.size() < sizeof(host_));
const std::size_t length = std::min(sizeof(host_) - 1, host.size());
std::memcpy(host_, host.data(), length);
std::memset(host_ + length, 0, sizeof(host_) - length);
}
const char* tor_address::unknown_str() noexcept
{
return unknown_host;
}
tor_address::tor_address() noexcept
: port_(0)
{
static_assert(sizeof(unknown_host) <= sizeof(host_), "bad buffer size");
std::memcpy(host_, unknown_host, sizeof(unknown_host));
std::memset(host_ + sizeof(unknown_host), 0, sizeof(host_) - sizeof(unknown_host));
}
expect<tor_address> tor_address::make(const boost::string_ref address, const std::uint16_t default_port)
{
boost::string_ref host = address.substr(0, address.rfind(':'));
const boost::string_ref port =
address.substr(host.size() + (host.size() == address.size() ? 0 : 1));
MONERO_CHECK(host_check(host));
std::uint16_t porti = default_port;
if (!port.empty() && !epee::string_tools::get_xtype_from_string(porti, std::string{port}))
return {net::error::invalid_port};
static_assert(v2_length <= v3_length, "bad internal host size");
static_assert(v3_length + sizeof(tld) == sizeof(tor_address::host_), "bad internal host size");
return tor_address{host, porti};
}
bool tor_address::_load(epee::serialization::portable_storage& src, epee::serialization::section* hparent)
{
tor_serialized in{};
if (in._load(src, hparent) && in.host.size() < sizeof(host_) && (in.host == unknown_host || !host_check(in.host).has_error()))
{
std::memcpy(host_, in.host.data(), in.host.size());
std::memset(host_ + in.host.size(), 0, sizeof(host_) - in.host.size());
port_ = in.port;
return true;
}
static_assert(sizeof(unknown_host) <= sizeof(host_), "bad buffer size");
std::memcpy(host_, unknown_host, sizeof(unknown_host)); // include null terminator
port_ = 0;
return false;
}
bool tor_address::store(epee::serialization::portable_storage& dest, epee::serialization::section* hparent) const
{
const tor_serialized out{std::string{host_}, port_};
return out.store(dest, hparent);
}
tor_address::tor_address(const tor_address& rhs) noexcept
: port_(rhs.port_)
{
std::memcpy(host_, rhs.host_, sizeof(host_));
}
tor_address& tor_address::operator=(const tor_address& rhs) noexcept
{
if (this != std::addressof(rhs))
{
port_ = rhs.port_;
std::memcpy(host_, rhs.host_, sizeof(host_));
}
return *this;
}
bool tor_address::is_unknown() const noexcept
{
static_assert(1 <= sizeof(host_), "host size too small");
return host_[0] == '<'; // character is not allowed otherwise
}
bool tor_address::equal(const tor_address& rhs) const noexcept
{
return port_ == rhs.port_ && is_same_host(rhs);
}
bool tor_address::less(const tor_address& rhs) const noexcept
{
return std::strcmp(host_str(), rhs.host_str()) < 0 || port() < rhs.port();
}
bool tor_address::is_same_host(const tor_address& rhs) const noexcept
{
//! \TODO v2 and v3 should be comparable - requires base32
return std::strcmp(host_str(), rhs.host_str()) == 0;
}
std::string tor_address::str() const
{
const std::size_t host_length = std::strlen(host_str());
const std::size_t port_length =
port_ == 0 ? 0 : std::numeric_limits<std::uint16_t>::digits10 + 2;
std::string out{};
out.reserve(host_length + port_length);
out.assign(host_str(), host_length);
if (port_ != 0)
{
out.push_back(':');
namespace karma = boost::spirit::karma;
karma::generate(std::back_inserter(out), karma::ushort_, port());
}
return out;
}
}
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