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Added support for "noise" over I1P/Tor to mask Tx transmission.

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This commit is contained in:
Lee Clagett 2019-05-16 16:34:22 -04:00
parent bdfc63ae4d
commit 3b24b1d082
28 changed files with 2731 additions and 162 deletions
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52
ANONYMITY_NETWORKS.md
View file

@ -160,25 +160,6 @@ the system clock is noticeably off (and therefore more fingerprintable),
linking the public IPv4/IPv6 connections with the anonymity networks will be linking the public IPv4/IPv6 connections with the anonymity networks will be
more difficult. more difficult.
### Bandwidth Usage
An ISP can passively monitor `monerod` connections from a node and observe when
a transaction is sent over a Tor/I2P connection via timing analysis + size of
data sent during that timeframe. I2P should provide better protection against
this attack - its connections are not circuit based. However, if a node is
only using I2P for broadcasting Monero transactions, the total aggregate of
I2P data would also leak information.
#### Mitigation
There is no current mitigation for the user right now. This attack is fairly
sophisticated, and likely requires support from the internet host of a Monero
user.
In the near future, "whitening" the amount of data sent over anonymity network
connections will be performed. An attempt will be made to make a transaction
broadcast indistinguishable from a peer timed sync command.
### Intermittent Monero Syncing ### Intermittent Monero Syncing
If a user only runs `monerod` to send a transaction then quit, this can also If a user only runs `monerod` to send a transaction then quit, this can also
@ -208,3 +189,36 @@ is a tradeoff in potential isses. Also, anyone attempting this strategy really
wants to uncover a user, it seems unlikely that this would be performed against wants to uncover a user, it seems unlikely that this would be performed against
every Tor/I2P user. every Tor/I2P user.
### I2P/Tor Stream Used Twice
If a single I2P/Tor stream is used 2+ times for transmitting a transaction, the
operator of the hidden service can conclude that both transactions came from the
same source. If the subsequent transactions spend a change output from the
earlier transactions, this will also reveal the "real" spend in the ring
signature. This issue was (primarily) raised by @secparam on Twitter.
#### Mitigation
`monerod` currently selects two outgoing connections every 5 minutes for
transmitting transactions over I2P/Tor. Using outgoing connections prevents an
adversary from making many incoming connections to obtain information (this
technique was taken from Dandelion). Outgoing connections also do not have a
persistent public key identity - the creation of a new circuit will generate
a new public key identity. The lock time on a change address is ~20 minutes, so
`monerod` will have rotated its selected outgoing connections several times in
most cases. However, the number of outgoing connections is typically a small
fixed number, so there is a decent probability of re-use with the same public
key identity.
@secparam (twitter) recommended changing circuits (Tor) as an additional
precaution. This is likely not a good idea - forcibly requesting Tor to change
circuits is observable by the ISP. Instead, `monerod` should likely disconnect
from peers ocassionally. Tor will rotate circuits every ~10 minutes, so
establishing new connections will use a new public key identity and make it
more difficult for the hidden service to link information. This process will
have to be done carefully because closing/reconnecting connections can also
leak information to hidden services if done improperly.
At the current time, if users need to frequently make transactions, I2P/Tor
will improve privacy from ISPs and other common adversaries, but still have
some metadata leakages to unknown hidden service operators.

165
LEVIN_PROTOCOL.md Normal file
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@ -0,0 +1,165 @@
# Levin Protocol
This is a document explaining the current design of the levin protocol, as
used by Monero. The protocol is largely inherited from cryptonote, but has
undergone some changes.
This document also may differ from the `struct bucket_head2` in Monero's
code slightly - the spec here is slightly more strict to allow for
extensibility.
One of the goals of this document is to clearly indicate what is being sent
"on the wire" to identify metadata that could de-anonymize users over I2P/Tor.
These issues will be addressed as they are found. See `ANONMITY_NETWORKS.md` in
the top-level folder for any outstanding issues.
> This document does not currently list all data being sent by the monero
> protocol, that portion is a work-in-progress. Please take the time to do it
> if interested in learning about Monero p2p traffic!
## Header
This header is sent for every Monero p2p message.
```
0 1 2 3
0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| 0x01 | 0x21 | 0x01 | 0x01 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| 0x01 | 0x01 | 0x01 | 0x01 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Length |
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| E. Response | Command
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Return Code
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|Q|S|B|E| Reserved
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| 0x01 | 0x00 | 0x00 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| 0x00 |
+-+-+-+-+-+-+-+-+
```
### Signature
The first 8 bytes are the "signature" which helps identify the protocol (in
case someone connected to the wrong port, etc). The comments indicate that byte
sequence is from "benders nightmare".
This also can be used by deep packet inspection (DPI) engines to identify
Monero when the link is not encrypted. SSL has been proposed as a means to
mitigate this issue, but BIP-151 or the Noise protocol should also be considered.
### Length
The length is an unsigned 64-bit little endian integer. The length does _not_
include the header.
The implementation currently rejects received messages that exceed 100 MB
(base 10) by default.
### Expect Response
A zero-byte if no response is expected from the peer, and a non-zero byte if a
response is expected from the peer. Peers must respond to requests with this
flag in the same order that they were received, however, other messages can be
sent between responses.
There are some commands in the
[cryptonote protocol](#cryptonote-protocol-commands) where a response is
expected from the peer, but this flag is not set. Those responses are returned
as notify messages and can be sent in any order by the peer.
### Command
An unsigned 32-bit little endian integer representing the Monero specific
command being invoked.
### Return Code
A signed 32-bit little integer integer representing the response from the peer
from the last command that was invoked. This is `0` for request messages.
### Flags
* `Q` - Bit is set if the message is a request.
* `S` - Bit is set if the message is a response.
* `B` - Bit is set if this is a the beginning of a [fragmented message](#fragmented-messages).
* `E` - Bit is set if this is the end of a [fragmented message](#fragmented-messages).
### Version
A fixed value of `1` as an unsigned 32-bit little endian integer.
## Message Flow
The protocol can be subdivided into: (1) notifications, (2) requests,
(3) responses, (4) fragmented messages, and (5) dummy messages. Response
messages must be sent in the same order that a peer issued a request message.
A peer does not have to send a response immediately following a request - any
other message type can be sent instead.
### Notifications
Notifications are one-way messages that can be sent at any time without
an expectation of a response from the peer. The `Q` bit must be set, the `S`,
`B` and `E` bits must be unset, and the `Expect Response` field must be zeroed.
Some notifications must be in response to other notifications. This is not
part of the levin messaging layer, and is described in the
[commands](#commands) section.
### Requests
Requests are the basis of the admin protocol for Monero. The `Q` bit must be
set, the `S`, `B` and `E` bits must be unset, and the `Expect Response` field
must be non-zero. The peer is expected to send a response message with the same
`command` number.
### Responses
Response message can only be sent after a peer first issues a request message.
Responses must have the `S` bit set, the `Q`, `B` and `E` bits unset, and have
a zeroed `Expect Response` field. The `Command` field must be the same value
that was sent in the request message. The `Return Code` is specific to the
`Command` being issued (see [commands])(#commands)).
### Fragmented
Fragmented messages were introduced for the "white noise" feature for i2p/tor.
A transaction can be sent in fragments to conceal when "real" data is being
sent instead of dummy messages. Only one fragmented message can be sent at a
time, and bits `B` and `E` are never set at the same time
(see [dummy messages](#dummy)). The re-constructed message must contain a
levin header for a different (non-fragment) message type.
The `Q` and `S` bits are never set and the `Expect Response` field must always
be zero. The first fragment has the `B` bit set, neither `B` nor `E` is set for
"middle" fragments, and `E` is set for the last fragment.
### Dummy
Dummy messages have the `B` and `E` bits set, the `Q` and `S` bits unset, and
the `Expect Reponse` field zeroed. When a message of this type is received, the
contents can be safely ignored.
## Commands
### P2P (Admin) Commands
#### (`1001` Request) Handshake
#### (`1001` Response) Handshake
#### (`1002` Request) Timed Sync
#### (`1002` Response) Timed Sync
#### (`1003` Request) Ping
#### (`1003` Response) Ping
#### (`1004` Request) Stat Info
#### (`1004` Response) Stat Info
#### (`1005` Request) Network State
#### (`1005` Response) Network State
#### (`1006` Request) Peer ID
#### (`1006` Reponse) Peer ID
#### (`1007` Request) Support Flags
#### (`1007` Response) Support Flags
### Cryptonote Protocol Commands
#### (`2001` Notification) New Block
#### (`2002` Notification) New Transactions
#### (`2003` Notification) Request Get Objects
#### (`2004` Notification) Response Get Objects
#### (`2006` Notification) Request Chain
#### (`2007` Notification) Response Chain Entry
#### (`2008` Notification) New Fluffy Block
#### (`2009` Notification) Request Fluffy Missing TX

22
contrib/epee/include/net/abstract_tcp_server2.h
View file

@ -49,10 +49,11 @@
#include <boost/asio/ssl.hpp> #include <boost/asio/ssl.hpp>
#include <boost/array.hpp> #include <boost/array.hpp>
#include <boost/noncopyable.hpp> #include <boost/noncopyable.hpp>
#include <boost/shared_ptr.hpp> #include <boost/shared_ptr.hpp> //! \TODO Convert to std::shared_ptr
#include <boost/enable_shared_from_this.hpp> #include <boost/enable_shared_from_this.hpp>
#include <boost/interprocess/detail/atomic.hpp> #include <boost/interprocess/detail/atomic.hpp>
#include <boost/thread/thread.hpp> #include <boost/thread/thread.hpp>
#include <memory>
#include "byte_slice.h" #include "byte_slice.h"
#include "net_utils_base.h" #include "net_utils_base.h"
#include "syncobj.h" #include "syncobj.h"
@ -91,25 +92,24 @@ namespace net_utils
public: public:
typedef typename t_protocol_handler::connection_context t_connection_context; typedef typename t_protocol_handler::connection_context t_connection_context;
struct shared_state : connection_basic_shared_state struct shared_state : connection_basic_shared_state, t_protocol_handler::config_type
{ {
shared_state() shared_state()
: connection_basic_shared_state(), pfilter(nullptr), config(), stop_signal_sent(false) : connection_basic_shared_state(), t_protocol_handler::config_type(), pfilter(nullptr), stop_signal_sent(false)
{} {}
i_connection_filter* pfilter; i_connection_filter* pfilter;
typename t_protocol_handler::config_type config;
bool stop_signal_sent; bool stop_signal_sent;
}; };
/// Construct a connection with the given io_service. /// Construct a connection with the given io_service.
explicit connection( boost::asio::io_service& io_service, explicit connection( boost::asio::io_service& io_service,
boost::shared_ptr<shared_state> state, std::shared_ptr<shared_state> state,
t_connection_type connection_type, t_connection_type connection_type,
epee::net_utils::ssl_support_t ssl_support); epee::net_utils::ssl_support_t ssl_support);
explicit connection( boost::asio::ip::tcp::socket&& sock, explicit connection( boost::asio::ip::tcp::socket&& sock,
boost::shared_ptr<shared_state> state, std::shared_ptr<shared_state> state,
t_connection_type connection_type, t_connection_type connection_type,
epee::net_utils::ssl_support_t ssl_support); epee::net_utils::ssl_support_t ssl_support);
@ -271,7 +271,13 @@ namespace net_utils
typename t_protocol_handler::config_type& get_config_object() typename t_protocol_handler::config_type& get_config_object()
{ {
assert(m_state != nullptr); // always set in constructor assert(m_state != nullptr); // always set in constructor
return m_state->config; return *m_state;
}
std::shared_ptr<typename t_protocol_handler::config_type> get_config_shared()
{
assert(m_state != nullptr); // always set in constructor
return {m_state};
} }
int get_binded_port(){return m_port;} int get_binded_port(){return m_port;}
@ -352,7 +358,7 @@ namespace net_utils
bool is_thread_worker(); bool is_thread_worker();
const boost::shared_ptr<typename connection<t_protocol_handler>::shared_state> m_state; const std::shared_ptr<typename connection<t_protocol_handler>::shared_state> m_state;
/// The io_service used to perform asynchronous operations. /// The io_service used to perform asynchronous operations.
struct worker struct worker

17
contrib/epee/include/net/abstract_tcp_server2.inl
View file

@ -68,7 +68,7 @@ namespace epee
namespace net_utils namespace net_utils
{ {
template<typename T> template<typename T>
T& check_and_get(boost::shared_ptr<T>& ptr) T& check_and_get(std::shared_ptr<T>& ptr)
{ {
CHECK_AND_ASSERT_THROW_MES(bool(ptr), "shared_state cannot be null"); CHECK_AND_ASSERT_THROW_MES(bool(ptr), "shared_state cannot be null");
return *ptr; return *ptr;
@ -81,7 +81,7 @@ PRAGMA_WARNING_DISABLE_VS(4355)
template<class t_protocol_handler> template<class t_protocol_handler>
connection<t_protocol_handler>::connection( boost::asio::io_service& io_service, connection<t_protocol_handler>::connection( boost::asio::io_service& io_service,
boost::shared_ptr<shared_state> state, std::shared_ptr<shared_state> state,
t_connection_type connection_type, t_connection_type connection_type,
ssl_support_t ssl_support ssl_support_t ssl_support
) )
@ -91,13 +91,13 @@ PRAGMA_WARNING_DISABLE_VS(4355)
template<class t_protocol_handler> template<class t_protocol_handler>
connection<t_protocol_handler>::connection( boost::asio::ip::tcp::socket&& sock, connection<t_protocol_handler>::connection( boost::asio::ip::tcp::socket&& sock,
boost::shared_ptr<shared_state> state, std::shared_ptr<shared_state> state,
t_connection_type connection_type, t_connection_type connection_type,
ssl_support_t ssl_support ssl_support_t ssl_support
) )
: :
connection_basic(std::move(sock), state, ssl_support), connection_basic(std::move(sock), state, ssl_support),
m_protocol_handler(this, check_and_get(state).config, context), m_protocol_handler(this, check_and_get(state), context),
buffer_ssl_init_fill(0), buffer_ssl_init_fill(0),
m_connection_type( connection_type ), m_connection_type( connection_type ),
m_throttle_speed_in("speed_in", "throttle_speed_in"), m_throttle_speed_in("speed_in", "throttle_speed_in"),
@ -378,7 +378,6 @@ PRAGMA_WARNING_DISABLE_VS(4355)
if(!recv_res) if(!recv_res)
{ {
//_info("[sock " << socket().native_handle() << "] protocol_want_close"); //_info("[sock " << socket().native_handle() << "] protocol_want_close");
//some error in protocol, protocol handler ask to close connection //some error in protocol, protocol handler ask to close connection
boost::interprocess::ipcdetail::atomic_write32(&m_want_close_connection, 1); boost::interprocess::ipcdetail::atomic_write32(&m_want_close_connection, 1);
bool do_shutdown = false; bool do_shutdown = false;
@ -601,7 +600,7 @@ PRAGMA_WARNING_DISABLE_VS(4355)
double current_speed_up; double current_speed_up;
{ {
CRITICAL_REGION_LOCAL(m_throttle_speed_out_mutex); CRITICAL_REGION_LOCAL(m_throttle_speed_out_mutex);
m_throttle_speed_out.handle_trafic_exact(cb); m_throttle_speed_out.handle_trafic_exact(chunk.size());
current_speed_up = m_throttle_speed_out.get_current_speed(); current_speed_up = m_throttle_speed_out.get_current_speed();
} }
context.m_current_speed_up = current_speed_up; context.m_current_speed_up = current_speed_up;
@ -665,7 +664,7 @@ PRAGMA_WARNING_DISABLE_VS(4355)
auto size_now = m_send_que.front().size(); auto size_now = m_send_que.front().size();
MDEBUG("do_send_chunk() NOW SENSD: packet="<<size_now<<" B"); MDEBUG("do_send_chunk() NOW SENSD: packet="<<size_now<<" B");
if (speed_limit_is_enabled()) if (speed_limit_is_enabled())
do_send_handler_write( chunk.data(), chunk.size() ); // (((H))) do_send_handler_write( m_send_que.back().data(), m_send_que.back().size() ); // (((H)))
CHECK_AND_ASSERT_MES( size_now == m_send_que.front().size(), false, "Unexpected queue size"); CHECK_AND_ASSERT_MES( size_now == m_send_que.front().size(), false, "Unexpected queue size");
reset_timer(get_default_timeout(), false); reset_timer(get_default_timeout(), false);
@ -893,7 +892,7 @@ PRAGMA_WARNING_DISABLE_VS(4355)
template<class t_protocol_handler> template<class t_protocol_handler>
boosted_tcp_server<t_protocol_handler>::boosted_tcp_server( t_connection_type connection_type ) : boosted_tcp_server<t_protocol_handler>::boosted_tcp_server( t_connection_type connection_type ) :
m_state(boost::make_shared<typename connection<t_protocol_handler>::shared_state>()), m_state(std::make_shared<typename connection<t_protocol_handler>::shared_state>()),
m_io_service_local_instance(new worker()), m_io_service_local_instance(new worker()),
io_service_(m_io_service_local_instance->io_service), io_service_(m_io_service_local_instance->io_service),
acceptor_(io_service_), acceptor_(io_service_),
@ -912,7 +911,7 @@ PRAGMA_WARNING_DISABLE_VS(4355)
template<class t_protocol_handler> template<class t_protocol_handler>
boosted_tcp_server<t_protocol_handler>::boosted_tcp_server(boost::asio::io_service& extarnal_io_service, t_connection_type connection_type) : boosted_tcp_server<t_protocol_handler>::boosted_tcp_server(boost::asio::io_service& extarnal_io_service, t_connection_type connection_type) :
m_state(boost::make_shared<typename connection<t_protocol_handler>::shared_state>()), m_state(std::make_shared<typename connection<t_protocol_handler>::shared_state>()),
io_service_(extarnal_io_service), io_service_(extarnal_io_service),
acceptor_(io_service_), acceptor_(io_service_),
acceptor_ipv6(io_service_), acceptor_ipv6(io_service_),

6
contrib/epee/include/net/connection_basic.hpp
View file

@ -100,7 +100,7 @@ class connection_basic_pimpl; // PIMPL for this class
class connection_basic { // not-templated base class for rapid developmet of some code parts class connection_basic { // not-templated base class for rapid developmet of some code parts
// beware of removing const, net_utils::connection is sketchily doing a cast to prevent storing ptr twice // beware of removing const, net_utils::connection is sketchily doing a cast to prevent storing ptr twice
const boost::shared_ptr<connection_basic_shared_state> m_state; const std::shared_ptr<connection_basic_shared_state> m_state;
public: public:
std::unique_ptr< connection_basic_pimpl > mI; // my Implementation std::unique_ptr< connection_basic_pimpl > mI; // my Implementation
@ -119,8 +119,8 @@ class connection_basic { // not-templated base class for rapid developmet of som
public: public:
// first counter is the ++/-- count of current sockets, the other socket_number is only-increasing ++ number generator // first counter is the ++/-- count of current sockets, the other socket_number is only-increasing ++ number generator
connection_basic(boost::asio::ip::tcp::socket&& socket, boost::shared_ptr<connection_basic_shared_state> state, ssl_support_t ssl_support); connection_basic(boost::asio::ip::tcp::socket&& socket, std::shared_ptr<connection_basic_shared_state> state, ssl_support_t ssl_support);
connection_basic(boost::asio::io_service &io_service, boost::shared_ptr<connection_basic_shared_state> state, ssl_support_t ssl_support); connection_basic(boost::asio::io_service &io_service, std::shared_ptr<connection_basic_shared_state> state, ssl_support_t ssl_support);
virtual ~connection_basic() noexcept(false); virtual ~connection_basic() noexcept(false);

2
contrib/epee/include/net/enums.h
View file

@ -49,7 +49,7 @@ namespace net_utils
{ {
invalid = 0, invalid = 0,
public_ = 1, // public is keyword public_ = 1, // public is keyword
i2p = 2, i2p = 2, // order from here changes priority of selection for origin TXes
tor = 3 tor = 3
}; };

27
contrib/epee/include/net/levin_base.h
View file

@ -29,7 +29,11 @@
#ifndef _LEVIN_BASE_H_ #ifndef _LEVIN_BASE_H_
#define _LEVIN_BASE_H_ #define _LEVIN_BASE_H_
#include <cstdint>
#include "byte_slice.h"
#include "net_utils_base.h" #include "net_utils_base.h"
#include "span.h"
#define LEVIN_SIGNATURE 0x0101010101012101LL //Bender's nightmare #define LEVIN_SIGNATURE 0x0101010101012101LL //Bender's nightmare
@ -72,6 +76,8 @@ namespace levin
#define LEVIN_PACKET_REQUEST 0x00000001 #define LEVIN_PACKET_REQUEST 0x00000001
#define LEVIN_PACKET_RESPONSE 0x00000002 #define LEVIN_PACKET_RESPONSE 0x00000002
#define LEVIN_PACKET_BEGIN 0x00000004
#define LEVIN_PACKET_END 0x00000008
#define LEVIN_PROTOCOL_VER_0 0 #define LEVIN_PROTOCOL_VER_0 0
@ -118,9 +124,30 @@ namespace levin
} }
} }
//! \return Intialized levin header.
bucket_head2 make_header(uint32_t command, uint64_t msg_size, uint32_t flags, bool expect_response) noexcept;
//! \return A levin notification message.
byte_slice make_notify(int command, epee::span<const std::uint8_t> payload);
/*! Generate a dummy levin message.
\param noise_bytes Total size of the returned `byte_slice`.
\return `nullptr` if `noise_size` is smaller than the levin header.
Otherwise, a dummy levin message. */
byte_slice make_noise_notify(std::size_t noise_bytes);
/*! Generate 1+ levin messages that are identical to the noise message size.
\param noise Each levin message will be identical to the size of this
message. The bytes from this message will be used for padding.
\return `nullptr` if `noise.size()` is less than the levin header size.
Otherwise, a levin notification message OR 2+ levin fragment messages.
Each message is `noise.size()` in length. */
byte_slice make_fragmented_notify(const byte_slice& noise, int command, epee::span<const std::uint8_t> payload);
} }
} }
#endif //_LEVIN_BASE_H_ #endif //_LEVIN_BASE_H_

126
contrib/epee/include/net/levin_protocol_handler_async.h
View file

@ -32,6 +32,7 @@
#include <boost/smart_ptr/make_shared.hpp> #include <boost/smart_ptr/make_shared.hpp>
#include <atomic> #include <atomic>
#include <deque>
#include "levin_base.h" #include "levin_base.h"
#include "buffer.h" #include "buffer.h"
@ -91,6 +92,7 @@ public:
int invoke_async(int command, const epee::span<const uint8_t> in_buff, boost::uuids::uuid connection_id, const callback_t &cb, size_t timeout = LEVIN_DEFAULT_TIMEOUT_PRECONFIGURED); int invoke_async(int command, const epee::span<const uint8_t> in_buff, boost::uuids::uuid connection_id, const callback_t &cb, size_t timeout = LEVIN_DEFAULT_TIMEOUT_PRECONFIGURED);
int notify(int command, const epee::span<const uint8_t> in_buff, boost::uuids::uuid connection_id); int notify(int command, const epee::span<const uint8_t> in_buff, boost::uuids::uuid connection_id);
int send(epee::byte_slice message, const boost::uuids::uuid& connection_id);
bool close(boost::uuids::uuid connection_id); bool close(boost::uuids::uuid connection_id);
bool update_connection_context(const t_connection_context& contxt); bool update_connection_context(const t_connection_context& contxt);
bool request_callback(boost::uuids::uuid connection_id); bool request_callback(boost::uuids::uuid connection_id);
@ -117,6 +119,22 @@ public:
template<class t_connection_context = net_utils::connection_context_base> template<class t_connection_context = net_utils::connection_context_base>
class async_protocol_handler class async_protocol_handler
{ {
std::string m_fragment_buffer;
bool send_message(uint32_t command, epee::span<const uint8_t> in_buff, uint32_t flags, bool expect_response)
{
const bucket_head2 head = make_header(command, in_buff.size(), flags, expect_response);
if(!m_pservice_endpoint->do_send(byte_slice{as_byte_span(head), in_buff}))
return false;
MDEBUG(m_connection_context << "LEVIN_PACKET_SENT. [len=" << head.m_cb
<< ", flags" << head.m_flags
<< ", r?=" << head.m_have_to_return_data
<<", cmd = " << head.m_command
<< ", ver=" << head.m_protocol_version);
return true;
}
public: public:
typedef t_connection_context connection_context; typedef t_connection_context connection_context;
typedef async_protocol_handler_config<t_connection_context> config_type; typedef async_protocol_handler_config<t_connection_context> config_type;
@ -259,34 +277,6 @@ public:
return handler->is_timer_started(); return handler->is_timer_started();
} }
template<class callback_t> friend struct anvoke_handler; template<class callback_t> friend struct anvoke_handler;
static bucket_head2 make_header(uint32_t command, uint64_t msg_size, uint32_t flags, bool expect_response) noexcept
{
bucket_head2 head = {0};
head.m_signature = SWAP64LE(LEVIN_SIGNATURE);
head.m_have_to_return_data = expect_response;
head.m_cb = SWAP64LE(msg_size);
head.m_command = SWAP32LE(command);
head.m_protocol_version = SWAP32LE(LEVIN_PROTOCOL_VER_1);
head.m_flags = SWAP32LE(flags);
return head;
}
bool send_message(uint32_t command, epee::span<const uint8_t> in_buff, uint32_t flags, bool expect_response)
{
const bucket_head2 head = make_header(command, in_buff.size(), flags, expect_response);
if(!m_pservice_endpoint->do_send(byte_slice{as_byte_span(head), in_buff}))
return false;
MDEBUG(m_connection_context << "LEVIN_PACKET_SENT. [len=" << head.m_cb
<< ", flags" << head.m_flags
<< ", r?=" << head.m_have_to_return_data
<<", cmd = " << head.m_command
<< ", ver=" << head.m_protocol_version);
return true;
}
public: public:
async_protocol_handler(net_utils::i_service_endpoint* psnd_hndlr, async_protocol_handler(net_utils::i_service_endpoint* psnd_hndlr,
config_type& config, config_type& config,
@ -403,7 +393,12 @@ public:
return false; return false;
} }
if(m_cache_in_buffer.size() + cb > m_config.m_max_packet_size) // these should never fail, but do runtime check for safety
CHECK_AND_ASSERT_MES(m_config.m_max_packet_size >= m_cache_in_buffer.size(), false, "Bad m_cache_in_buffer.size()");
CHECK_AND_ASSERT_MES(m_config.m_max_packet_size - m_cache_in_buffer.size() >= m_fragment_buffer.size(), false, "Bad m_cache_in_buffer.size() + m_fragment_buffer.size()");
// flipped to subtraction; prevent overflow since m_max_packet_size is variable and public
if(cb > m_config.m_max_packet_size - m_cache_in_buffer.size() - m_fragment_buffer.size())
{ {
MWARNING(m_connection_context << "Maximum packet size exceed!, m_max_packet_size = " << m_config.m_max_packet_size MWARNING(m_connection_context << "Maximum packet size exceed!, m_max_packet_size = " << m_config.m_max_packet_size
<< ", packet received " << m_cache_in_buffer.size() + cb << ", packet received " << m_cache_in_buffer.size() + cb
@ -435,8 +430,38 @@ public:
} }
break; break;
} }
{ {
std::string temp{};
epee::span<const uint8_t> buff_to_invoke = m_cache_in_buffer.carve((std::string::size_type)m_current_head.m_cb); epee::span<const uint8_t> buff_to_invoke = m_cache_in_buffer.carve((std::string::size_type)m_current_head.m_cb);
m_state = stream_state_head;
// abstract_tcp_server2.h manages max bandwidth for a p2p link
if (!(m_current_head.m_flags & (LEVIN_PACKET_REQUEST | LEVIN_PACKET_RESPONSE)))
{
// special noise/fragment command
static constexpr const uint32_t both_flags = (LEVIN_PACKET_BEGIN | LEVIN_PACKET_END);
if ((m_current_head.m_flags & both_flags) == both_flags)
break; // noise message, skip to next message
if (m_current_head.m_flags & LEVIN_PACKET_BEGIN)
m_fragment_buffer.clear();
m_fragment_buffer.append(reinterpret_cast<const char*>(buff_to_invoke.data()), buff_to_invoke.size());
if (!(m_current_head.m_flags & LEVIN_PACKET_END))
break; // skip to next message
if (m_fragment_buffer.size() < sizeof(bucket_head2))
{
MERROR(m_connection_context << "Fragmented data too small for levin header");
return false;
}
temp = std::move(m_fragment_buffer);
m_fragment_buffer.clear();
std::memcpy(std::addressof(m_current_head), std::addressof(temp[0]), sizeof(bucket_head2));
buff_to_invoke = {reinterpret_cast<const uint8_t*>(temp.data()) + sizeof(bucket_head2), temp.size() - sizeof(bucket_head2)};
}
bool is_response = (m_oponent_protocol_ver == LEVIN_PROTOCOL_VER_1 && m_current_head.m_flags&LEVIN_PACKET_RESPONSE); bool is_response = (m_oponent_protocol_ver == LEVIN_PROTOCOL_VER_1 && m_current_head.m_flags&LEVIN_PACKET_RESPONSE);
@ -505,8 +530,13 @@ public:
else else
m_config.m_pcommands_handler->notify(m_current_head.m_command, buff_to_invoke, m_connection_context); m_config.m_pcommands_handler->notify(m_current_head.m_command, buff_to_invoke, m_connection_context);
} }
// reuse small buffer
if (!temp.empty() && temp.capacity() <= 64 * 1024)
{
temp.clear();
m_fragment_buffer = std::move(temp);
}
} }
m_state = stream_state_head;
break; break;
case stream_state_head: case stream_state_head:
{ {
@ -616,7 +646,7 @@ public:
if (LEVIN_OK != err_code) if (LEVIN_OK != err_code)
{ {
epee::span<const uint8_t> stub_buff{(const uint8_t*)"", 0}; epee::span<const uint8_t> stub_buff = nullptr;
// Never call callback inside critical section, that can cause deadlock // Never call callback inside critical section, that can cause deadlock
cb(err_code, stub_buff, m_connection_context); cb(err_code, stub_buff, m_connection_context);
return false; return false;
@ -698,6 +728,32 @@ public:
return 1; return 1;
} }
/*! Sends `message` without adding a levin header. The message must have
been created with `make_notify`, `make_noise_notify` or
`make_fragmented_notify`. See additional instructions for
`make_fragmented_notify`.
\return 1 on success */
int send(byte_slice message)
{
const misc_utils::auto_scope_leave_caller scope_exit_handler = misc_utils::create_scope_leave_handler(
boost::bind(&async_protocol_handler::finish_outer_call, this)
);
if(m_deletion_initiated)
return LEVIN_ERROR_CONNECTION_DESTROYED;
const std::size_t length = message.size();
if (!m_pservice_endpoint->do_send(std::move(message)))
{
LOG_ERROR_CC(m_connection_context, "Failed to send message, dropping it");
return -1;
}
MDEBUG(m_connection_context << "LEVIN_PACKET_SENT. [len=" << (length - sizeof(bucket_head2)) << ", r?=0]");
return 1;
}
//------------------------------------------------------------------------------------------ //------------------------------------------------------------------------------------------
boost::uuids::uuid get_connection_id() {return m_connection_context.m_connection_id;} boost::uuids::uuid get_connection_id() {return m_connection_context.m_connection_id;}
//------------------------------------------------------------------------------------------ //------------------------------------------------------------------------------------------
@ -876,6 +932,14 @@ int async_protocol_handler_config<t_connection_context>::notify(int command, con
} }
//------------------------------------------------------------------------------------------ //------------------------------------------------------------------------------------------
template<class t_connection_context> template<class t_connection_context>
int async_protocol_handler_config<t_connection_context>::send(byte_slice message, const boost::uuids::uuid& connection_id)
{
async_protocol_handler<t_connection_context>* aph;
int r = find_and_lock_connection(connection_id, aph);
return LEVIN_OK == r ? aph->send(std::move(message)) : 0;
}
//------------------------------------------------------------------------------------------
template<class t_connection_context>
bool async_protocol_handler_config<t_connection_context>::close(boost::uuids::uuid connection_id) bool async_protocol_handler_config<t_connection_context>::close(boost::uuids::uuid connection_id)
{ {
CRITICAL_REGION_LOCAL(m_connects_lock); CRITICAL_REGION_LOCAL(m_connects_lock);

13
contrib/epee/include/net/net_helper.h
View file

@ -31,6 +31,7 @@
//#include <Winsock2.h> //#include <Winsock2.h>
//#include <Ws2tcpip.h> //#include <Ws2tcpip.h>
#include <atomic>
#include <string> #include <string>
#include <boost/version.hpp> #include <boost/version.hpp>
#include <boost/asio/io_service.hpp> #include <boost/asio/io_service.hpp>
@ -154,7 +155,7 @@ namespace net_utils
} }
inline inline
try_connect_result_t try_connect(const std::string& addr, const std::string& port, std::chrono::milliseconds timeout, epee::net_utils::ssl_support_t ssl_support) try_connect_result_t try_connect(const std::string& addr, const std::string& port, std::chrono::milliseconds timeout)
{ {
m_deadline.expires_from_now(timeout); m_deadline.expires_from_now(timeout);
boost::unique_future<boost::asio::ip::tcp::socket> connection = m_connector(addr, port, m_deadline); boost::unique_future<boost::asio::ip::tcp::socket> connection = m_connector(addr, port, m_deadline);
@ -174,11 +175,11 @@ namespace net_utils
m_connected = true; m_connected = true;
m_deadline.expires_at(std::chrono::steady_clock::time_point::max()); m_deadline.expires_at(std::chrono::steady_clock::time_point::max());
// SSL Options // SSL Options
if (ssl_support == epee::net_utils::ssl_support_t::e_ssl_support_enabled || ssl_support == epee::net_utils::ssl_support_t::e_ssl_support_autodetect) if (m_ssl_options.support == epee::net_utils::ssl_support_t::e_ssl_support_enabled || m_ssl_options.support == epee::net_utils::ssl_support_t::e_ssl_support_autodetect)
{ {
if (!m_ssl_options.handshake(*m_ssl_socket, boost::asio::ssl::stream_base::client, addr)) if (!m_ssl_options.handshake(*m_ssl_socket, boost::asio::ssl::stream_base::client, addr))
{ {
if (ssl_support == epee::net_utils::ssl_support_t::e_ssl_support_autodetect) if (m_ssl_options.support == epee::net_utils::ssl_support_t::e_ssl_support_autodetect)
{ {
boost::system::error_code ignored_ec; boost::system::error_code ignored_ec;
m_ssl_socket->next_layer().shutdown(boost::asio::ip::tcp::socket::shutdown_both, ignored_ec); m_ssl_socket->next_layer().shutdown(boost::asio::ip::tcp::socket::shutdown_both, ignored_ec);
@ -217,7 +218,7 @@ namespace net_utils
// Get a list of endpoints corresponding to the server name. // Get a list of endpoints corresponding to the server name.
try_connect_result_t try_connect_result = try_connect(addr, port, timeout, m_ssl_options.support); try_connect_result_t try_connect_result = try_connect(addr, port, timeout);
if (try_connect_result == CONNECT_FAILURE) if (try_connect_result == CONNECT_FAILURE)
return false; return false;
if (m_ssl_options.support == epee::net_utils::ssl_support_t::e_ssl_support_autodetect) if (m_ssl_options.support == epee::net_utils::ssl_support_t::e_ssl_support_autodetect)
@ -226,7 +227,7 @@ namespace net_utils
{ {
MERROR("SSL handshake failed on an autodetect connection, reconnecting without SSL"); MERROR("SSL handshake failed on an autodetect connection, reconnecting without SSL");
m_ssl_options.support = epee::net_utils::ssl_support_t::e_ssl_support_disabled; m_ssl_options.support = epee::net_utils::ssl_support_t::e_ssl_support_disabled;
if (try_connect(addr, port, timeout, m_ssl_options.support) != CONNECT_SUCCESS) if (try_connect(addr, port, timeout) != CONNECT_SUCCESS)
return false; return false;
} }
} }
@ -562,7 +563,7 @@ namespace net_utils
{ {
m_deadline.cancel(); m_deadline.cancel();
boost::system::error_code ec; boost::system::error_code ec;
if(m_ssl_options.support != ssl_support_t::e_ssl_support_disabled) if(m_ssl_options)
shutdown_ssl(); shutdown_ssl();
m_ssl_socket->next_layer().cancel(ec); m_ssl_socket->next_layer().cancel(ec);
if(ec) if(ec)

2
contrib/epee/src/CMakeLists.txt
View file

@ -27,7 +27,7 @@
# THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. # THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
add_library(epee STATIC byte_slice.cpp hex.cpp http_auth.cpp mlog.cpp net_helper.cpp net_utils_base.cpp string_tools.cpp wipeable_string.cpp add_library(epee STATIC byte_slice.cpp hex.cpp http_auth.cpp mlog.cpp net_helper.cpp net_utils_base.cpp string_tools.cpp wipeable_string.cpp
memwipe.c connection_basic.cpp network_throttle.cpp network_throttle-detail.cpp mlocker.cpp buffer.cpp net_ssl.cpp) levin_base.cpp memwipe.c connection_basic.cpp network_throttle.cpp network_throttle-detail.cpp mlocker.cpp buffer.cpp net_ssl.cpp)
if (USE_READLINE AND GNU_READLINE_FOUND) if (USE_READLINE AND GNU_READLINE_FOUND)
add_library(epee_readline STATIC readline_buffer.cpp) add_library(epee_readline STATIC readline_buffer.cpp)

4
contrib/epee/src/connection_basic.cpp
View file

@ -128,7 +128,7 @@ connection_basic_pimpl::connection_basic_pimpl(const std::string &name) : m_thro
int connection_basic_pimpl::m_default_tos; int connection_basic_pimpl::m_default_tos;
// methods: // methods:
connection_basic::connection_basic(boost::asio::ip::tcp::socket&& sock, boost::shared_ptr<connection_basic_shared_state> state, ssl_support_t ssl_support) connection_basic::connection_basic(boost::asio::ip::tcp::socket&& sock, std::shared_ptr<connection_basic_shared_state> state, ssl_support_t ssl_support)
: :
m_state(std::move(state)), m_state(std::move(state)),
mI( new connection_basic_pimpl("peer") ), mI( new connection_basic_pimpl("peer") ),
@ -152,7 +152,7 @@ connection_basic::connection_basic(boost::asio::ip::tcp::socket&& sock, boost::s
_note("Spawned connection #"<<mI->m_peer_number<<" to " << remote_addr_str << " currently we have sockets count:" << m_state->sock_count); _note("Spawned connection #"<<mI->m_peer_number<<" to " << remote_addr_str << " currently we have sockets count:" << m_state->sock_count);
} }
connection_basic::connection_basic(boost::asio::io_service &io_service, boost::shared_ptr<connection_basic_shared_state> state, ssl_support_t ssl_support) connection_basic::connection_basic(boost::asio::io_service &io_service, std::shared_ptr<connection_basic_shared_state> state, ssl_support_t ssl_support)
: :
m_state(std::move(state)), m_state(std::move(state)),
mI( new connection_basic_pimpl("peer") ), mI( new connection_basic_pimpl("peer") ),

128
contrib/epee/src/levin_base.cpp Normal file
View file

@ -0,0 +1,128 @@
// Copyright (c) 2019, 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 "net/levin_base.h"
#include "int-util.h"
namespace epee
{
namespace levin
{
bucket_head2 make_header(uint32_t command, uint64_t msg_size, uint32_t flags, bool expect_response) noexcept
{
bucket_head2 head = {0};
head.m_signature = SWAP64LE(LEVIN_SIGNATURE);
head.m_have_to_return_data = expect_response;
head.m_cb = SWAP64LE(msg_size);
head.m_command = SWAP32LE(command);
head.m_protocol_version = SWAP32LE(LEVIN_PROTOCOL_VER_1);
head.m_flags = SWAP32LE(flags);
return head;
}
byte_slice make_notify(int command, epee::span<const std::uint8_t> payload)
{
const bucket_head2 head = make_header(command, payload.size(), LEVIN_PACKET_REQUEST, false);
return byte_slice{epee::as_byte_span(head), payload};
}
byte_slice make_noise_notify(const std::size_t noise_bytes)
{
static constexpr const std::uint32_t flags =
LEVIN_PACKET_BEGIN | LEVIN_PACKET_END;
if (noise_bytes < sizeof(bucket_head2))
return nullptr;
std::string buffer(noise_bytes, char(0));
const bucket_head2 head = make_header(0, noise_bytes - sizeof(bucket_head2), flags, false);
std::memcpy(std::addressof(buffer[0]), std::addressof(head), sizeof(head));
return byte_slice{std::move(buffer)};
}
byte_slice make_fragmented_notify(const byte_slice& noise_message, int command, epee::span<const std::uint8_t> payload)
{
const size_t noise_size = noise_message.size();
if (noise_size < sizeof(bucket_head2) * 2)
return nullptr;
if (payload.size() <= noise_size - sizeof(bucket_head2))
{
/* The entire message can be sent at once, and the levin binary parser
will ignore extra bytes. So just pad with zeroes and otherwise send
a "normal", not fragmented message. */
const size_t padding = noise_size - sizeof(bucket_head2) - payload.size();
const span<const uint8_t> padding_bytes{noise_message.end() - padding, padding};
const bucket_head2 head = make_header(command, noise_size - sizeof(bucket_head2), LEVIN_PACKET_REQUEST, false);
return byte_slice{as_byte_span(head), payload, padding_bytes};
}
// fragment message
const size_t payload_space = noise_size - sizeof(bucket_head2);
const size_t expected_fragments = ((payload.size() - 2) / payload_space) + 1;
std::string buffer{};
buffer.reserve((expected_fragments + 1) * noise_size); // +1 here overselects for internal bucket_head2 value
bucket_head2 head = make_header(0, noise_size - sizeof(bucket_head2), LEVIN_PACKET_BEGIN, false);
buffer.append(reinterpret_cast<const char*>(&head), sizeof(head));
head.m_command = command;
head.m_flags = LEVIN_PACKET_REQUEST;
head.m_cb = payload.size();
buffer.append(reinterpret_cast<const char*>(&head), sizeof(head));
size_t copy_size = payload.remove_prefix(payload_space - sizeof(bucket_head2));
buffer.append(reinterpret_cast<const char*>(payload.data()) - copy_size, copy_size);
head.m_command = 0;
head.m_flags = 0;
head.m_cb = noise_size - sizeof(bucket_head2);
while (!payload.empty())
{
copy_size = payload.remove_prefix(payload_space);
if (payload.empty())
head.m_flags = LEVIN_PACKET_END;
buffer.append(reinterpret_cast<const char*>(&head), sizeof(head));
buffer.append(reinterpret_cast<const char*>(payload.data()) - copy_size, copy_size);
}
const size_t padding = noise_size - copy_size - sizeof(bucket_head2);
buffer.append(reinterpret_cast<const char*>(noise_message.end()) - padding, padding);
return byte_slice{std::move(buffer)};
}
} // levin
} // epee

2
src/cryptonote_basic/connection_context.h
View file

@ -31,8 +31,10 @@
#pragma once #pragma once
#include <unordered_set> #include <unordered_set>
#include <atomic> #include <atomic>
#include <boost/date_time/posix_time/posix_time.hpp>
#include "net/net_utils_base.h" #include "net/net_utils_base.h"
#include "copyable_atomic.h" #include "copyable_atomic.h"
#include "crypto/hash.h"
namespace cryptonote namespace cryptonote
{ {

10
src/cryptonote_config.h
View file

@ -100,6 +100,16 @@
#define CRYPTONOTE_MEMPOOL_TX_LIVETIME (86400*3) //seconds, three days #define CRYPTONOTE_MEMPOOL_TX_LIVETIME (86400*3) //seconds, three days
#define CRYPTONOTE_MEMPOOL_TX_FROM_ALT_BLOCK_LIVETIME 604800 //seconds, one week #define CRYPTONOTE_MEMPOOL_TX_FROM_ALT_BLOCK_LIVETIME 604800 //seconds, one week
// see src/cryptonote_protocol/levin_notify.cpp
#define CRYPTONOTE_NOISE_MIN_EPOCH 5 // minutes
#define CRYPTONOTE_NOISE_EPOCH_RANGE 30 // seconds
#define CRYPTONOTE_NOISE_MIN_DELAY 10 // seconds
#define CRYPTONOTE_NOISE_DELAY_RANGE 5 // seconds
#define CRYPTONOTE_NOISE_BYTES 3*1024 // 3 KiB
#define CRYPTONOTE_NOISE_CHANNELS 2 // Max outgoing connections per zone used for noise/covert sending
#define CRYPTONOTE_MAX_FRAGMENTS 20 // ~20 * NOISE_BYTES max payload size for covert/noise send
#define COMMAND_RPC_GET_BLOCKS_FAST_MAX_COUNT 1000 #define COMMAND_RPC_GET_BLOCKS_FAST_MAX_COUNT 1000
#define P2P_LOCAL_WHITE_PEERLIST_LIMIT 1000 #define P2P_LOCAL_WHITE_PEERLIST_LIMIT 1000

64
src/cryptonote_protocol/cryptonote_protocol_handler.inl
View file

@ -2227,69 +2227,11 @@ skip:
template<class t_core> template<class t_core>
bool t_cryptonote_protocol_handler<t_core>::relay_transactions(NOTIFY_NEW_TRANSACTIONS::request& arg, cryptonote_connection_context& exclude_context) bool t_cryptonote_protocol_handler<t_core>::relay_transactions(NOTIFY_NEW_TRANSACTIONS::request& arg, cryptonote_connection_context& exclude_context)
{ {
const bool hide_tx_broadcast = for(auto& tx_blob : arg.txs)
1 < m_p2p->get_zone_count() && exclude_context.m_remote_address.get_zone() == epee::net_utils::zone::invalid; m_core.on_transaction_relayed(tx_blob);
if (hide_tx_broadcast)
MDEBUG("Attempting to conceal origin of tx via anonymity network connection(s)");
// no check for success, so tell core they're relayed unconditionally // no check for success, so tell core they're relayed unconditionally
const bool pad_transactions = m_core.pad_transactions() || hide_tx_broadcast; m_p2p->send_txs(std::move(arg.txs), exclude_context.m_remote_address.get_zone(), exclude_context.m_connection_id, m_core.pad_transactions());
size_t bytes = pad_transactions ? 9 /* header */ + 4 /* 1 + 'txs' */ + tools::get_varint_data(arg.txs.size()).size() : 0;
for(auto tx_blob_it = arg.txs.begin(); tx_blob_it!=arg.txs.end(); ++tx_blob_it)
{
m_core.on_transaction_relayed(*tx_blob_it);
if (pad_transactions)
bytes += tools::get_varint_data(tx_blob_it->size()).size() + tx_blob_it->size();
}
if (pad_transactions)
{
// stuff some dummy bytes in to stay safe from traffic volume analysis
static constexpr size_t granularity = 1024;
size_t padding = granularity - bytes % granularity;
const size_t overhead = 2 /* 1 + '_' */ + tools::get_varint_data(padding).size();
if (overhead > padding)
padding = 0;
else
padding -= overhead;
arg._ = std::string(padding, ' ');
std::string arg_buff;
epee::serialization::store_t_to_binary(arg, arg_buff);
// we probably lowballed the payload size a bit, so added a but too much. Fix this now.
size_t remove = arg_buff.size() % granularity;
if (remove > arg._.size())
arg._.clear();
else
arg._.resize(arg._.size() - remove);
// if the size of _ moved enough, we might lose byte in size encoding, we don't care
}
std::vector<std::pair<epee::net_utils::zone, boost::uuids::uuid>> connections;
m_p2p->for_each_connection([hide_tx_broadcast, &exclude_context, &connections](connection_context& context, nodetool::peerid_type peer_id, uint32_t support_flags)
{
const epee::net_utils::zone current_zone = context.m_remote_address.get_zone();
const bool broadcast_to_peer =
peer_id &&
(hide_tx_broadcast != bool(current_zone == epee::net_utils::zone::public_)) &&
exclude_context.m_connection_id != context.m_connection_id;
if (broadcast_to_peer)
connections.push_back({current_zone, context.m_connection_id});
return true;
});
if (connections.empty())
MERROR("Transaction not relayed - no" << (hide_tx_broadcast ? " privacy": "") << " peers available");
else
{
std::string fullBlob;
epee::serialization::store_t_to_binary(arg, fullBlob);
m_p2p->relay_notify_to_list(NOTIFY_NEW_TRANSACTIONS::ID, epee::strspan<uint8_t>(fullBlob), std::move(connections));
}
return true; return true;
} }
//------------------------------------------------------------------------------------------------------------------------ //------------------------------------------------------------------------------------------------------------------------

574
src/cryptonote_protocol/levin_notify.cpp Normal file
View file

@ -0,0 +1,574 @@
// Copyright (c) 2019, 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 "levin_notify.h"
#include <boost/asio/steady_timer.hpp>
#include <boost/system/system_error.hpp>
#include <chrono>
#include <deque>
#include <stdexcept>
#include "common/expect.h"
#include "common/varint.h"
#include "cryptonote_config.h"
#include "crypto/random.h"
#include "cryptonote_basic/connection_context.h"
#include "cryptonote_protocol/cryptonote_protocol_defs.h"
#include "net/dandelionpp.h"
#include "p2p/net_node.h"
namespace cryptonote
{
namespace levin
{
namespace
{
constexpr std::size_t connection_id_reserve_size = 100;
constexpr const std::chrono::minutes noise_min_epoch{CRYPTONOTE_NOISE_MIN_EPOCH};
constexpr const std::chrono::seconds noise_epoch_range{CRYPTONOTE_NOISE_EPOCH_RANGE};
constexpr const std::chrono::seconds noise_min_delay{CRYPTONOTE_NOISE_MIN_DELAY};
constexpr const std::chrono::seconds noise_delay_range{CRYPTONOTE_NOISE_DELAY_RANGE};
/*! Select a randomized duration from 0 to `range`. The precision will be to
the systems `steady_clock`. As an example, supplying 3 seconds to this
function will select a duration from [0, 3] seconds, and the increments
for the selection will be determined by the `steady_clock` precision
(typically nanoseconds).
\return A randomized duration from 0 to `range`. */
std::chrono::steady_clock::duration random_duration(std::chrono::steady_clock::duration range)
{
using rep = std::chrono::steady_clock::rep;
return std::chrono::steady_clock::duration{crypto::rand_range(rep(0), range.count())};
}
//! \return All outgoing connections supporting fragments in `connections`.
std::vector<boost::uuids::uuid> get_out_connections(connections& p2p)
{
std::vector<boost::uuids::uuid> outs;
outs.reserve(connection_id_reserve_size);
/* The foreach call is serialized with a lock, but should be quick due to
the reserve call so a strand is not used. Investigate if there is lots
of waiting in here. */
p2p.foreach_connection([&outs] (detail::p2p_context& context) {
if (!context.m_is_income)
outs.emplace_back(context.m_connection_id);
return true;
});
return outs;
}
std::string make_tx_payload(std::vector<blobdata>&& txs, const bool pad)
{
NOTIFY_NEW_TRANSACTIONS::request request{};
request.txs = std::move(txs);
if (pad)
{
size_t bytes = 9 /* header */ + 4 /* 1 + 'txs' */ + tools::get_varint_data(request.txs.size()).size();
for(auto tx_blob_it = request.txs.begin(); tx_blob_it!=request.txs.end(); ++tx_blob_it)
bytes += tools::get_varint_data(tx_blob_it->size()).size() + tx_blob_it->size();
// stuff some dummy bytes in to stay safe from traffic volume analysis
static constexpr const size_t granularity = 1024;
size_t padding = granularity - bytes % granularity;
const size_t overhead = 2 /* 1 + '_' */ + tools::get_varint_data(padding).size();
if (overhead > padding)
padding = 0;
else
padding -= overhead;
request._ = std::string(padding, ' ');
std::string arg_buff;
epee::serialization::store_t_to_binary(request, arg_buff);
// we probably lowballed the payload size a bit, so added a but too much. Fix this now.
size_t remove = arg_buff.size() % granularity;
if (remove > request._.size())
request._.clear();
else
request._.resize(request._.size() - remove);
// if the size of _ moved enough, we might lose byte in size encoding, we don't care
}
std::string fullBlob;
if (!epee::serialization::store_t_to_binary(request, fullBlob))
throw std::runtime_error{"Failed to serialize to epee binary format"};
return fullBlob;
}
/* The current design uses `asio::strand`s. The documentation isn't as clear
as it should be - a `strand` has an internal `mutex` and `bool`. The
`mutex` synchronizes thread access and the `bool` is set when a thread is
executing something "in the strand". Therefore, if a callback has lots of
work to do in a `strand`, asio can switch to some other task instead of
blocking 1+ threads to wait for the original thread to complete the task
(as is the case when client code has a `mutex` inside the callback). The
downside is that asio _always_ allocates for the callback, even if it can
be immediately executed. So if all work in a strand is minimal, a lock
may be better.
This code uses a strand per "zone" and a strand per "channel in a zone".
`dispatch` is used heavily, which means "execute immediately in _this_
thread if the strand is not in use, otherwise queue the callback to be
executed immediately after the strand completes its current task".
`post` is used where deferred execution to an `asio::io_service::run`
thread is preferred.
The strand per "zone" is useful because the levin
`foreach_connection` is blocked with a mutex anyway. So this primarily
helps with reducing blocking of a thread attempting a "flood"
notification. Updating/merging the outgoing connections in the
Dandelion++ map is also somewhat expensive.
The strand per "channel" may need a re-visit. The most "expensive" code
is figuring out the noise/notification to send. If levin code is
optimized further, it might be better to just use standard locks per
channel. */
//! A queue of levin messages for a noise i2p/tor link
struct noise_channel
{
explicit noise_channel(boost::asio::io_service& io_service)
: active(nullptr),
queue(),
strand(io_service),
next_noise(io_service),
connection(boost::uuids::nil_uuid())
{}
// `asio::io_service::strand` cannot be copied or moved
noise_channel(const noise_channel&) = delete;
noise_channel& operator=(const noise_channel&) = delete;
// Only read/write these values "inside the strand"
epee::byte_slice active;
std::deque<epee::byte_slice> queue;
boost::asio::io_service::strand strand;
boost::asio::steady_timer next_noise;
boost::uuids::uuid connection;
};
} // anonymous
namespace detail
{
struct zone
{
explicit zone(boost::asio::io_service& io_service, std::shared_ptr<connections> p2p, epee::byte_slice noise_in)
: p2p(std::move(p2p)),
noise(std::move(noise_in)),
next_epoch(io_service),
strand(io_service),
map(),
channels(),
connection_count(0)
{
for (std::size_t count = 0; !noise.empty() && count < CRYPTONOTE_NOISE_CHANNELS; ++count)
channels.emplace_back(io_service);
}
const std::shared_ptr<connections> p2p;
const epee::byte_slice noise; //!< `!empty()` means zone is using noise channels
boost::asio::steady_timer next_epoch;
boost::asio::io_service::strand strand;
net::dandelionpp::connection_map map;//!< Tracks outgoing uuid's for noise channels or Dandelion++ stems
std::deque<noise_channel> channels; //!< Never touch after init; only update elements on `noise_channel.strand`
std::atomic<std::size_t> connection_count; //!< Only update in strand, can be read at any time
};
} // detail
namespace
{
//! Adds a message to the sending queue of the channel.
class queue_covert_notify
{
std::shared_ptr<detail::zone> zone_;
epee::byte_slice message_; // Requires manual copy constructor
const std::size_t destination_;
public:
queue_covert_notify(std::shared_ptr<detail::zone> zone, epee::byte_slice message, std::size_t destination)
: zone_(std::move(zone)), message_(std::move(message)), destination_(destination)
{}
queue_covert_notify(queue_covert_notify&&) = default;
queue_covert_notify(const queue_covert_notify& source)
: zone_(source.zone_), message_(source.message_.clone()), destination_(source.destination_)
{}
//! \pre Called within `zone_->channels[destionation_].strand`.
void operator()()
{
if (!zone_)
return;
noise_channel& channel = zone_->channels.at(destination_);
assert(channel.strand.running_in_this_thread());
if (!channel.connection.is_nil())
channel.queue.push_back(std::move(message_));
}
};
//! Sends a message to every active connection
class flood_notify
{
std::shared_ptr<detail::zone> zone_;
epee::byte_slice message_; // Requires manual copy
boost::uuids::uuid source_;
public:
explicit flood_notify(std::shared_ptr<detail::zone> zone, epee::byte_slice message, const boost::uuids::uuid& source)
: zone_(std::move(zone)), message_(message.clone()), source_(source)
{}
flood_notify(flood_notify&&) = default;
flood_notify(const flood_notify& source)
: zone_(source.zone_), message_(source.message_.clone()), source_(source.source_)
{}
void operator()() const
{
if (!zone_ || !zone_->p2p)
return;
assert(zone_->strand.running_in_this_thread());
/* The foreach should be quick, but then it iterates and acquires the
same lock for every connection. So do in a strand because two threads
will ping-pong each other with cacheline invalidations. Revisit if
algorithm changes or the locking strategy within the levin config
class changes. */
std::vector<boost::uuids::uuid> connections;
connections.reserve(connection_id_reserve_size);
zone_->p2p->foreach_connection([this, &connections] (detail::p2p_context& context) {
if (this->source_ != context.m_connection_id)
connections.emplace_back(context.m_connection_id);
return true;
});
for (const boost::uuids::uuid& connection : connections)
zone_->p2p->send(message_.clone(), connection);
}
};
//! Updates the connection for a channel.
struct update_channel
{
std::shared_ptr<detail::zone> zone_;
const std::size_t channel_;
const boost::uuids::uuid connection_;
//! \pre Called within `stem_.strand`.
void operator()() const
{
if (!zone_)
return;
noise_channel& channel = zone_->channels.at(channel_);
assert(channel.strand.running_in_this_thread());
static_assert(
CRYPTONOTE_MAX_FRAGMENTS <= (noise_min_epoch / (noise_min_delay + noise_delay_range)),
"Max fragments more than the max that can be sent in an epoch"
);
/* This clears the active message so that a message "in-flight" is
restarted. DO NOT try to send the remainder of the fragments, this
additional send time can leak that this node was sending out a real
notify (tx) instead of dummy noise. */
channel.connection = connection_;
channel.active = nullptr;
if (connection_.is_nil())
channel.queue.clear();
}
};
//! Merges `out_connections_` into the existing `zone_->map`.
struct update_channels
{
std::shared_ptr<detail::zone> zone_;
std::vector<boost::uuids::uuid> out_connections_;
//! \pre Called within `zone->strand`.
static void post(std::shared_ptr<detail::zone> zone)
{
if (!zone)
return;
assert(zone->strand.running_in_this_thread());
zone->connection_count = zone->map.size();
for (auto id = zone->map.begin(); id != zone->map.end(); ++id)
{
const std::size_t i = id - zone->map.begin();
zone->channels[i].strand.post(update_channel{zone, i, *id});
}
}
//! \pre Called within `zone_->strand`.
void operator()()
{
if (!zone_)
return;
assert(zone_->strand.running_in_this_thread());
if (zone_->map.update(std::move(out_connections_)))
post(std::move(zone_));
}
};
//! Swaps out noise channels entirely; new epoch start.
class change_channels
{
std::shared_ptr<detail::zone> zone_;
net::dandelionpp::connection_map map_; // Requires manual copy constructor
public:
explicit change_channels(std::shared_ptr<detail::zone> zone, net::dandelionpp::connection_map map)
: zone_(std::move(zone)), map_(std::move(map))
{}
change_channels(change_channels&&) = default;
change_channels(const change_channels& source)
: zone_(source.zone_), map_(source.map_.clone())
{}
//! \pre Called within `zone_->strand`.
void operator()()
{
if (!zone_)
return
assert(zone_->strand.running_in_this_thread());
zone_->map = std::move(map_);
update_channels::post(std::move(zone_));
}
};
//! Sends a noise packet or real notification and sets timer for next call.
struct send_noise
{
std::shared_ptr<detail::zone> zone_;
const std::size_t channel_;
static void wait(const std::chrono::steady_clock::time_point start, std::shared_ptr<detail::zone> zone, const std::size_t index)
{
if (!zone)
return;
noise_channel& channel = zone->channels.at(index);
channel.next_noise.expires_at(start + noise_min_delay + random_duration(noise_delay_range));
channel.next_noise.async_wait(
channel.strand.wrap(send_noise{std::move(zone), index})
);
}
//! \pre Called within `zone_->channels[channel_].strand`.
void operator()(boost::system::error_code error)
{
if (!zone_ || !zone_->p2p || zone_->noise.empty())
return;
if (error && error != boost::system::errc::operation_canceled)
throw boost::system::system_error{error, "send_noise timer failed"};
assert(zone_->channels.at(channel_).strand.running_in_this_thread());
const auto start = std::chrono::steady_clock::now();
noise_channel& channel = zone_->channels.at(channel_);
if (!channel.connection.is_nil())
{
epee::byte_slice message = nullptr;
if (!channel.active.empty())
message = channel.active.take_slice(zone_->noise.size());
else if (!channel.queue.empty())
{
channel.active = channel.queue.front().clone();
message = channel.active.take_slice(zone_->noise.size());
}
else
message = zone_->noise.clone();
if (zone_->p2p->send(std::move(message), channel.connection))
{
if (!channel.queue.empty() && channel.active.empty())
channel.queue.pop_front();
}
else
{
channel.active = nullptr;
channel.connection = boost::uuids::nil_uuid();
zone_->strand.post(
update_channels{zone_, get_out_connections(*zone_->p2p)}
);
}
}
wait(start, std::move(zone_), channel_);
}
};
//! Prepares connections for new channel epoch and sets timer for next epoch
struct start_epoch
{
// Variables allow for Dandelion++ extension
std::shared_ptr<detail::zone> zone_;
std::chrono::seconds min_epoch_;
std::chrono::seconds epoch_range_;
std::size_t count_;
//! \pre Should not be invoked within any strand to prevent blocking.
void operator()(const boost::system::error_code error = {})
{
if (!zone_ || !zone_->p2p)
return;
if (error && error != boost::system::errc::operation_canceled)
throw boost::system::system_error{error, "start_epoch timer failed"};
const auto start = std::chrono::steady_clock::now();
zone_->strand.dispatch(
change_channels{zone_, net::dandelionpp::connection_map{get_out_connections(*(zone_->p2p)), count_}}
);
detail::zone& alias = *zone_;
alias.next_epoch.expires_at(start + min_epoch_ + random_duration(epoch_range_));
alias.next_epoch.async_wait(start_epoch{std::move(*this)});
}
};
} // anonymous
notify::notify(boost::asio::io_service& service, std::shared_ptr<connections> p2p, epee::byte_slice noise)
: zone_(std::make_shared<detail::zone>(service, std::move(p2p), std::move(noise)))
{
if (!zone_->p2p)
throw std::logic_error{"cryptonote::levin::notify cannot have nullptr p2p argument"};
if (!zone_->noise.empty())
{
const auto now = std::chrono::steady_clock::now();
start_epoch{zone_, noise_min_epoch, noise_epoch_range, CRYPTONOTE_NOISE_CHANNELS}();
for (std::size_t channel = 0; channel < zone_->channels.size(); ++channel)
send_noise::wait(now, zone_, channel);
}
}
notify::~notify() noexcept
{}
notify::status notify::get_status() const noexcept
{
if (!zone_)
return {false, false};
return {!zone_->noise.empty(), CRYPTONOTE_NOISE_CHANNELS <= zone_->connection_count};
}
void notify::new_out_connection()
{
if (!zone_ || zone_->noise.empty() || CRYPTONOTE_NOISE_CHANNELS <= zone_->connection_count)
return;
zone_->strand.dispatch(
update_channels{zone_, get_out_connections(*(zone_->p2p))}
);
}
void notify::run_epoch()
{
if (!zone_)
return;
zone_->next_epoch.cancel();
}
void notify::run_stems()
{
if (!zone_)
return;
for (noise_channel& channel : zone_->channels)
channel.next_noise.cancel();
}
bool notify::send_txs(std::vector<cryptonote::blobdata> txs, const boost::uuids::uuid& source, const bool pad_txs)
{
if (!zone_)
return false;
if (!zone_->noise.empty() && !zone_->channels.empty())
{
// covert send in "noise" channel
static_assert(
CRYPTONOTE_MAX_FRAGMENTS * CRYPTONOTE_NOISE_BYTES <= LEVIN_DEFAULT_MAX_PACKET_SIZE, "most nodes will reject this fragment setting"
);
// padding is not useful when using noise mode
const std::string payload = make_tx_payload(std::move(txs), false);
epee::byte_slice message = epee::levin::make_fragmented_notify(
zone_->noise, NOTIFY_NEW_TRANSACTIONS::ID, epee::strspan<std::uint8_t>(payload)
);
if (CRYPTONOTE_MAX_FRAGMENTS * zone_->noise.size() < message.size())
{
MERROR("notify::send_txs provided message exceeding covert fragment size");
return false;
}
for (std::size_t channel = 0; channel < zone_->channels.size(); ++channel)
{
zone_->channels[channel].strand.dispatch(
queue_covert_notify{zone_, message.clone(), channel}
);
}
}
else
{
const std::string payload = make_tx_payload(std::move(txs), pad_txs);
epee::byte_slice message =
epee::levin::make_notify(NOTIFY_NEW_TRANSACTIONS::ID, epee::strspan<std::uint8_t>(payload));
// traditional monero send technique
zone_->strand.dispatch(flood_notify{zone_, std::move(message), source});
}
return true;
}
} // levin
} // net

132
src/cryptonote_protocol/levin_notify.h Normal file
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@ -0,0 +1,132 @@
// Copyright (c) 2019, 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.
#pragma once
#include <boost/asio/io_service.hpp>
#include <boost/uuid/uuid.hpp>
#include <memory>
#include <vector>
#include "byte_slice.h"
#include "cryptonote_basic/blobdatatype.h"
#include "net/enums.h"
#include "span.h"
namespace epee
{
namespace levin
{
template<typename> class async_protocol_handler_config;
}
}
namespace nodetool
{
template<typename> struct p2p_connection_context_t;
}
namespace cryptonote
{
struct cryptonote_connection_context;
}
namespace cryptonote
{
namespace levin
{
namespace detail
{
using p2p_context = nodetool::p2p_connection_context_t<cryptonote::cryptonote_connection_context>;
struct zone; //!< Internal data needed for zone notifications
} // detail
using connections = epee::levin::async_protocol_handler_config<detail::p2p_context>;
//! Provides tx notification privacy
class notify
{
std::shared_ptr<detail::zone> zone_;
public:
struct status
{
bool has_noise;
bool connections_filled;
};
//! Construct an instance that cannot notify.
notify() noexcept
: zone_(nullptr)
{}
//! Construct an instance with available notification `zones`.
explicit notify(boost::asio::io_service& service, std::shared_ptr<connections> p2p, epee::byte_slice noise);
notify(const notify&) = delete;
notify(notify&&) = default;
~notify() noexcept;
notify& operator=(const notify&) = delete;
notify& operator=(notify&&) = default;
//! \return Status information for zone selection.
status get_status() const noexcept;
//! Probe for new outbound connection - skips if not needed.
void new_out_connection();
//! Run the logic for the next epoch immediately. Only use in testing.
void run_epoch();
//! Run the logic for the next stem timeout imemdiately. Only use in testing.
void run_stems();
/*! Send txs using `cryptonote_protocol_defs.h` payload format wrapped in a
levin header. The message will be sent in a "discreet" manner if
enabled - if `!noise.empty()` then the `command`/`payload` will be
queued to send at the next available noise interval. Otherwise, a
standard Monero flood notification will be used.
\note Eventually Dandelion++ stem sending will be used here when
enabled.
\param txs The transactions that need to be serialized and relayed.
\param source The source of the notification. `is_nil()` indicates this
node is the source. Dandelion++ will use this to map a source to a
particular stem.
\param pad_txs A request to pad txs to help conceal origin via
statistical analysis. Ignored if noise was enabled during
construction.
\return True iff the notification is queued for sending. */
bool send_txs(std::vector<blobdata> txs, const boost::uuids::uuid& source, bool pad_txs);
};
} // levin
} // net

4
src/net/CMakeLists.txt
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@ -26,8 +26,8 @@
# STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF # 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. # THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
set(net_sources error.cpp i2p_address.cpp parse.cpp socks.cpp socks_connect.cpp tor_address.cpp) set(net_sources dandelionpp.cpp error.cpp i2p_address.cpp parse.cpp socks.cpp socks_connect.cpp tor_address.cpp)
set(net_headers error.h i2p_address.h parse.h socks.h socks_connect.h tor_address.h) set(net_headers dandelionpp.h error.h i2p_address.h parse.h socks.h socks_connect.h tor_address.h)
monero_add_library(net ${net_sources} ${net_headers}) monero_add_library(net ${net_sources} ${net_headers})
target_link_libraries(net common epee ${Boost_ASIO_LIBRARY}) target_link_libraries(net common epee ${Boost_ASIO_LIBRARY})

212
src/net/dandelionpp.cpp Normal file
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@ -0,0 +1,212 @@
// Copyright (c) 2019, 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 "dandelionpp.h"
#include <boost/container/small_vector.hpp>
#include <boost/uuid/nil_generator.hpp>
#include <chrono>
#include "common/expect.h"
#include "cryptonote_config.h"
#include "crypto/crypto.h"
namespace net
{
namespace dandelionpp
{
namespace
{
constexpr const std::size_t expected_max_channels = CRYPTONOTE_NOISE_CHANNELS;
// could be in util somewhere
struct key_less
{
template<typename K, typename V>
bool operator()(const std::pair<K, V>& left, const K& right) const
{
return left.first < right;
}
template<typename K, typename V>
bool operator()(const K& left, const std::pair<K, V>& right) const
{
return left < right.first;
}
};
std::size_t select_stem(epee::span<const std::size_t> usage, epee::span<const boost::uuids::uuid> out_map)
{
assert(usage.size() < std::numeric_limits<std::size_t>::max()); // prevented in constructor
if (usage.size() < out_map.size())
return std::numeric_limits<std::size_t>::max();
// small_vector uses stack space if `expected_max_channels < capacity()`
std::size_t lowest = std::numeric_limits<std::size_t>::max();
boost::container::small_vector<std::size_t, expected_max_channels> choices;
static_assert(sizeof(choices) < 256, "choices is too large based on current configuration");
for (const boost::uuids::uuid& out : out_map)
{
if (!out.is_nil())
{
const std::size_t location = std::addressof(out) - out_map.begin();
if (usage[location] < lowest)
{
lowest = usage[location];
choices = {location};
}
else if (usage[location] == lowest)
choices.push_back(location);
}
}
switch (choices.size())
{
case 0:
return std::numeric_limits<std::size_t>::max();
case 1:
return choices[0];
default:
break;
}
return choices[crypto::rand_idx(choices.size())];
}
} // anonymous
connection_map::connection_map(std::vector<boost::uuids::uuid> out_connections, const std::size_t stems)
: out_mapping_(std::move(out_connections)),
in_mapping_(),
usage_count_()
{
// max value is used by `select_stem` as error case
if (stems == std::numeric_limits<std::size_t>::max())
MONERO_THROW(common_error::kInvalidArgument, "stems value cannot be max size_t");
usage_count_.resize(stems);
if (stems < out_mapping_.size())
{
for (unsigned i = 0; i < stems; ++i)
std::swap(out_mapping_[i], out_mapping_.at(i + crypto::rand_idx(out_mapping_.size() - i)));
out_mapping_.resize(stems);
}
else
{
std::shuffle(out_mapping_.begin(), out_mapping_.end(), crypto::random_device{});
}
}
connection_map::~connection_map() noexcept
{}
connection_map connection_map::clone() const
{
return {*this};
}
bool connection_map::update(std::vector<boost::uuids::uuid> current)
{
std::sort(current.begin(), current.end());
bool replace = false;
for (auto& existing_out : out_mapping_)
{
const auto elem = std::lower_bound(current.begin(), current.end(), existing_out);
if (elem == current.end() || *elem != existing_out)
{
existing_out = boost::uuids::nil_uuid();
replace = true;
}
else // already using connection, remove it from candidate list
current.erase(elem);
}
if (!replace && out_mapping_.size() == usage_count_.size())
return false;
const std::size_t existing_outs = out_mapping_.size();
for (std::size_t i = 0; i < usage_count_.size() && !current.empty(); ++i)
{
const bool increase_stems = out_mapping_.size() <= i;
if (increase_stems || out_mapping_[i].is_nil())
{
std::swap(current.back(), current.at(crypto::rand_idx(current.size())));
if (increase_stems)
out_mapping_.push_back(current.back());
else
out_mapping_[i] = current.back();
current.pop_back();
}
}
return replace || existing_outs < out_mapping_.size();
}
std::size_t connection_map::size() const noexcept
{
std::size_t count = 0;
for (const boost::uuids::uuid& connection : out_mapping_)
{
if (!connection.is_nil())
++count;
}
return count;
}
boost::uuids::uuid connection_map::get_stem(const boost::uuids::uuid& source)
{
auto elem = std::lower_bound(in_mapping_.begin(), in_mapping_.end(), source, key_less{});
if (elem == in_mapping_.end() || elem->first != source)
{
const std::size_t index = select_stem(epee::to_span(usage_count_), epee::to_span(out_mapping_));
if (out_mapping_.size() < index)
return boost::uuids::nil_uuid();
elem = in_mapping_.emplace(elem, source, index);
usage_count_[index]++;
}
else if (out_mapping_.at(elem->second).is_nil()) // stem connection disconnected after mapping
{
usage_count_.at(elem->second)--;
const std::size_t index = select_stem(epee::to_span(usage_count_), epee::to_span(out_mapping_));
if (out_mapping_.size() < index)
{
in_mapping_.erase(elem);
return boost::uuids::nil_uuid();
}
elem->second = index;
usage_count_[index]++;
}
return out_mapping_[elem->second];
}
} // dandelionpp
} // net

106
src/net/dandelionpp.h Normal file
View file

@ -0,0 +1,106 @@
// Copyright (c) 2019, 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.
#pragma once
#include <boost/uuid/uuid.hpp>
#include <cstddef>
#include <memory>
#include <utility>
#include <vector>
#include "span.h"
namespace net
{
namespace dandelionpp
{
//! Assists with mapping source -> stem and tracking connections for stem.
class connection_map
{
// Make sure to update clone method if changing members
std::vector<boost::uuids::uuid> out_mapping_; //<! Current outgoing uuid connection at index.
std::vector<std::pair<boost::uuids::uuid, std::size_t>> in_mapping_; //<! uuid source to an `out_mapping_` index.
std::vector<std::size_t> usage_count_;
// Use clone method to prevent "hidden" copies.
connection_map(const connection_map&) = default;
public:
using value_type = boost::uuids::uuid;
using size_type = std::vector<boost::uuids::uuid>::size_type;
using difference_type = std::vector<boost::uuids::uuid>::difference_type;
using reference = const boost::uuids::uuid&;
using const_reference = reference;
using iterator = std::vector<boost::uuids::uuid>::const_iterator;
using const_iterator = iterator;
//! Initialized with zero stem connections.
explicit connection_map()
: connection_map(std::vector<boost::uuids::uuid>{}, 0)
{}
//! Initialized with `out_connections` and `stem_count`.
explicit connection_map(std::vector<boost::uuids::uuid> out_connections, std::size_t stems);
connection_map(connection_map&&) = default;
~connection_map() noexcept;
connection_map& operator=(connection_map&&) = default;
connection_map& operator=(const connection_map&) = delete;
//! \return An exact duplicate of `this` map.
connection_map clone() const;
//! \return First stem connection.
const_iterator begin() const noexcept
{
return out_mapping_.begin();
}
//! \return One-past the last stem connection.
const_iterator end() const noexcept
{
return out_mapping_.end();
}
/*! Merges in current connections with the previous set of connections.
If a connection died, a new one will take its place in the stem or
the stem is marked as dead.
\param connections Current outbound connection ids.
\return True if any updates to `get_connections()` was made. */
bool update(std::vector<boost::uuids::uuid> current);
//! \return Number of outgoing connections in use.
std::size_t size() const noexcept;
//! \return Current stem mapping for `source` or `nil_uuid()` if none is possible.
boost::uuids::uuid get_stem(const boost::uuids::uuid& source);
};
} // dandelionpp
} // net

15
src/p2p/net_node.cpp
View file

@ -144,7 +144,7 @@ namespace nodetool
const command_line::arg_descriptor<std::vector<std::string> > arg_p2p_add_exclusive_node = {"add-exclusive-node", "Specify list of peers to connect to only." const command_line::arg_descriptor<std::vector<std::string> > arg_p2p_add_exclusive_node = {"add-exclusive-node", "Specify list of peers to connect to only."
" If this option is given the options add-priority-node and seed-node are ignored"}; " If this option is given the options add-priority-node and seed-node are ignored"};
const command_line::arg_descriptor<std::vector<std::string> > arg_p2p_seed_node = {"seed-node", "Connect to a node to retrieve peer addresses, and disconnect"}; const command_line::arg_descriptor<std::vector<std::string> > arg_p2p_seed_node = {"seed-node", "Connect to a node to retrieve peer addresses, and disconnect"};
const command_line::arg_descriptor<std::vector<std::string> > arg_proxy = {"proxy", "<network-type>,<socks-ip:port>[,max_connections] i.e. \"tor,127.0.0.1:9050,100\""}; const command_line::arg_descriptor<std::vector<std::string> > arg_proxy = {"proxy", "<network-type>,<socks-ip:port>[,max_connections][,disable_noise] i.e. \"tor,127.0.0.1:9050,100,disable_noise\""};
const command_line::arg_descriptor<std::vector<std::string> > arg_anonymous_inbound = {"anonymous-inbound", "<hidden-service-address>,<[bind-ip:]port>[,max_connections] i.e. \"x.onion,127.0.0.1:18083,100\""}; const command_line::arg_descriptor<std::vector<std::string> > arg_anonymous_inbound = {"anonymous-inbound", "<hidden-service-address>,<[bind-ip:]port>[,max_connections] i.e. \"x.onion,127.0.0.1:18083,100\""};
const command_line::arg_descriptor<bool> arg_p2p_hide_my_port = {"hide-my-port", "Do not announce yourself as peerlist candidate", false, true}; const command_line::arg_descriptor<bool> arg_p2p_hide_my_port = {"hide-my-port", "Do not announce yourself as peerlist candidate", false, true};
const command_line::arg_descriptor<bool> arg_no_sync = {"no-sync", "Don't synchronize the blockchain with other peers", false}; const command_line::arg_descriptor<bool> arg_no_sync = {"no-sync", "Don't synchronize the blockchain with other peers", false};
@ -183,7 +183,17 @@ namespace nodetool
const boost::string_ref proxy{next->begin(), next->size()}; const boost::string_ref proxy{next->begin(), next->size()};
++next; ++next;
if (!next.eof()) for (unsigned count = 0; !next.eof(); ++count, ++next)
{
if (2 <= count)
{
MERROR("Too many ',' characters given to --" << arg_proxy.name);
return boost::none;
}
if (boost::string_ref{next->begin(), next->size()} == "disable_noise")
proxies.back().noise = false;
else
{ {
proxies.back().max_connections = get_max_connections(*next); proxies.back().max_connections = get_max_connections(*next);
if (proxies.back().max_connections == 0) if (proxies.back().max_connections == 0)
@ -192,6 +202,7 @@ namespace nodetool
return boost::none; return boost::none;
} }
} }
}
switch (epee::net_utils::zone_from_string(zone)) switch (epee::net_utils::zone_from_string(zone))
{ {

10
src/p2p/net_node.h
View file

@ -43,6 +43,7 @@
#include <vector> #include <vector>
#include "cryptonote_config.h" #include "cryptonote_config.h"
#include "cryptonote_protocol/levin_notify.h"
#include "warnings.h" #include "warnings.h"
#include "net/abstract_tcp_server2.h" #include "net/abstract_tcp_server2.h"
#include "net/levin_protocol_handler.h" #include "net/levin_protocol_handler.h"
@ -66,12 +67,14 @@ namespace nodetool
proxy() proxy()
: max_connections(-1), : max_connections(-1),
address(), address(),
zone(epee::net_utils::zone::invalid) zone(epee::net_utils::zone::invalid),
noise(true)
{} {}
std::int64_t max_connections; std::int64_t max_connections;
boost::asio::ip::tcp::endpoint address; boost::asio::ip::tcp::endpoint address;
epee::net_utils::zone zone; epee::net_utils::zone zone;
bool noise;
}; };
struct anonymous_inbound struct anonymous_inbound
@ -154,6 +157,7 @@ namespace nodetool
m_bind_ipv6_address(), m_bind_ipv6_address(),
m_port(), m_port(),
m_port_ipv6(), m_port_ipv6(),
m_notifier(),
m_our_address(), m_our_address(),
m_peerlist(), m_peerlist(),
m_config{}, m_config{},
@ -172,6 +176,7 @@ namespace nodetool
m_bind_ipv6_address(), m_bind_ipv6_address(),
m_port(), m_port(),
m_port_ipv6(), m_port_ipv6(),
m_notifier(),
m_our_address(), m_our_address(),
m_peerlist(), m_peerlist(),
m_config{}, m_config{},
@ -189,6 +194,7 @@ namespace nodetool
std::string m_bind_ipv6_address; std::string m_bind_ipv6_address;
std::string m_port; std::string m_port;
std::string m_port_ipv6; std::string m_port_ipv6;
cryptonote::levin::notify m_notifier;
epee::net_utils::network_address m_our_address; // in anonymity networks epee::net_utils::network_address m_our_address; // in anonymity networks
peerlist_manager m_peerlist; peerlist_manager m_peerlist;
config m_config; config m_config;
@ -255,7 +261,6 @@ namespace nodetool
size_t get_public_gray_peers_count(); size_t get_public_gray_peers_count();
void get_public_peerlist(std::vector<peerlist_entry>& gray, std::vector<peerlist_entry>& white); void get_public_peerlist(std::vector<peerlist_entry>& gray, std::vector<peerlist_entry>& white);
void get_peerlist(std::vector<peerlist_entry>& gray, std::vector<peerlist_entry>& white); void get_peerlist(std::vector<peerlist_entry>& gray, std::vector<peerlist_entry>& white);
size_t get_zone_count() const { return m_network_zones.size(); }
void change_max_out_public_peers(size_t count); void change_max_out_public_peers(size_t count);
uint32_t get_max_out_public_peers() const; uint32_t get_max_out_public_peers() const;
@ -330,6 +335,7 @@ namespace nodetool
virtual void callback(p2p_connection_context& context); virtual void callback(p2p_connection_context& context);
//----------------- i_p2p_endpoint ------------------------------------------------------------- //----------------- i_p2p_endpoint -------------------------------------------------------------
virtual bool relay_notify_to_list(int command, const epee::span<const uint8_t> data_buff, std::vector<std::pair<epee::net_utils::zone, boost::uuids::uuid>> connections); virtual bool relay_notify_to_list(int command, const epee::span<const uint8_t> data_buff, std::vector<std::pair<epee::net_utils::zone, boost::uuids::uuid>> connections);
virtual epee::net_utils::zone send_txs(std::vector<cryptonote::blobdata> txs, const epee::net_utils::zone origin, const boost::uuids::uuid& source, const bool pad_txs);
virtual bool invoke_command_to_peer(int command, const epee::span<const uint8_t> req_buff, std::string& resp_buff, const epee::net_utils::connection_context_base& context); virtual bool invoke_command_to_peer(int command, const epee::span<const uint8_t> req_buff, std::string& resp_buff, const epee::net_utils::connection_context_base& context);
virtual bool invoke_notify_to_peer(int command, const epee::span<const uint8_t> req_buff, const epee::net_utils::connection_context_base& context); virtual bool invoke_notify_to_peer(int command, const epee::span<const uint8_t> req_buff, const epee::net_utils::connection_context_base& context);
virtual bool drop_connection(const epee::net_utils::connection_context_base& context); virtual bool drop_connection(const epee::net_utils::connection_context_base& context);

81
src/p2p/net_node.inl
View file

@ -383,6 +383,9 @@ namespace nodetool
m_offline = command_line::get_arg(vm, cryptonote::arg_offline); m_offline = command_line::get_arg(vm, cryptonote::arg_offline);
m_use_ipv6 = command_line::get_arg(vm, arg_p2p_use_ipv6); m_use_ipv6 = command_line::get_arg(vm, arg_p2p_use_ipv6);
m_require_ipv4 = command_line::get_arg(vm, arg_p2p_require_ipv4); m_require_ipv4 = command_line::get_arg(vm, arg_p2p_require_ipv4);
public_zone.m_notifier = cryptonote::levin::notify{
public_zone.m_net_server.get_io_service(), public_zone.m_net_server.get_config_shared(), nullptr
};
if (command_line::has_arg(vm, arg_p2p_add_peer)) if (command_line::has_arg(vm, arg_p2p_add_peer))
{ {
@ -462,6 +465,7 @@ namespace nodetool
return false; return false;
epee::byte_slice noise = nullptr;
auto proxies = get_proxies(vm); auto proxies = get_proxies(vm);
if (!proxies) if (!proxies)
return false; return false;
@ -479,6 +483,20 @@ namespace nodetool
if (!set_max_out_peers(zone, proxy.max_connections)) if (!set_max_out_peers(zone, proxy.max_connections))
return false; return false;
epee::byte_slice this_noise = nullptr;
if (proxy.noise)
{
static_assert(sizeof(epee::levin::bucket_head2) < CRYPTONOTE_NOISE_BYTES, "noise bytes too small");
if (noise.empty())
noise = epee::levin::make_noise_notify(CRYPTONOTE_NOISE_BYTES);
this_noise = noise.clone();
}
zone.m_notifier = cryptonote::levin::notify{
zone.m_net_server.get_io_service(), zone.m_net_server.get_config_shared(), std::move(this_noise)
};
} }
for (const auto& zone : m_network_zones) for (const auto& zone : m_network_zones)
@ -494,6 +512,7 @@ namespace nodetool
if (!inbounds) if (!inbounds)
return false; return false;
const std::size_t tx_relay_zones = m_network_zones.size();
for (auto& inbound : *inbounds) for (auto& inbound : *inbounds)
{ {
network_zone& zone = add_zone(inbound.our_address.get_zone()); network_zone& zone = add_zone(inbound.our_address.get_zone());
@ -504,6 +523,12 @@ namespace nodetool
return false; return false;
} }
if (zone.m_connect == nullptr && tx_relay_zones <= 1)
{
MERROR("Listed --" << arg_anonymous_inbound.name << " without listing any --" << arg_proxy.name << ". The latter is necessary for sending origin txes over anonymity networks");
return false;
}
zone.m_bind_ip = std::move(inbound.local_ip); zone.m_bind_ip = std::move(inbound.local_ip);
zone.m_port = std::move(inbound.local_port); zone.m_port = std::move(inbound.local_port);
zone.m_net_server.set_default_remote(std::move(inbound.default_remote)); zone.m_net_server.set_default_remote(std::move(inbound.default_remote));
@ -1266,6 +1291,7 @@ namespace nodetool
ape.first_seen = first_seen_stamp ? first_seen_stamp : time(nullptr); ape.first_seen = first_seen_stamp ? first_seen_stamp : time(nullptr);
zone.m_peerlist.append_with_peer_anchor(ape); zone.m_peerlist.append_with_peer_anchor(ape);
zone.m_notifier.new_out_connection();
LOG_DEBUG_CC(*con, "CONNECTION HANDSHAKED OK."); LOG_DEBUG_CC(*con, "CONNECTION HANDSHAKED OK.");
return true; return true;
@ -2000,6 +2026,61 @@ namespace nodetool
} }
//----------------------------------------------------------------------------------- //-----------------------------------------------------------------------------------
template<class t_payload_net_handler> template<class t_payload_net_handler>
epee::net_utils::zone node_server<t_payload_net_handler>::send_txs(std::vector<cryptonote::blobdata> txs, const epee::net_utils::zone origin, const boost::uuids::uuid& source, const bool pad_txs)
{
namespace enet = epee::net_utils;
const auto send = [&txs, &source, pad_txs] (std::pair<const enet::zone, network_zone>& network)
{
if (network.second.m_notifier.send_txs(std::move(txs), source, (pad_txs || network.first != enet::zone::public_)))
return network.first;
return enet::zone::invalid;
};
if (m_network_zones.empty())
return enet::zone::invalid;
if (origin != enet::zone::invalid)
return send(*m_network_zones.begin()); // send all txs received via p2p over public network
if (m_network_zones.size() <= 2)
return send(*m_network_zones.rbegin()); // see static asserts below; sends over anonymity network iff enabled
/* These checks are to ensure that i2p is highest priority if multiple
zones are selected. Make sure to update logic if the values cannot be
in the same relative order. `m_network_zones` must be sorted map too. */
static_assert(std::is_same<std::underlying_type<enet::zone>::type, std::uint8_t>{}, "expected uint8_t zone");
static_assert(unsigned(enet::zone::invalid) == 0, "invalid expected to be 0");
static_assert(unsigned(enet::zone::public_) == 1, "public_ expected to be 1");
static_assert(unsigned(enet::zone::i2p) == 2, "i2p expected to be 2");
static_assert(unsigned(enet::zone::tor) == 3, "tor expected to be 3");
// check for anonymity networks with noise and connections
for (auto network = ++m_network_zones.begin(); network != m_network_zones.end(); ++network)
{
if (enet::zone::tor < network->first)
break; // unknown network
const auto status = network->second.m_notifier.get_status();
if (status.has_noise && status.connections_filled)
return send(*network);
}
// use the anonymity network with outbound support
for (auto network = ++m_network_zones.begin(); network != m_network_zones.end(); ++network)
{
if (enet::zone::tor < network->first)
break; // unknown network
if (network->second.m_connect)
return send(*network);
}
// configuration should not allow this scenario
return enet::zone::invalid;
}
//-----------------------------------------------------------------------------------
template<class t_payload_net_handler>
void node_server<t_payload_net_handler>::callback(p2p_connection_context& context) void node_server<t_payload_net_handler>::callback(p2p_connection_context& context)
{ {
m_payload_handler.on_callback(context); m_payload_handler.on_callback(context);

13
src/p2p/net_node_common.h
View file

@ -33,6 +33,8 @@
#include <boost/uuid/uuid.hpp> #include <boost/uuid/uuid.hpp>
#include <utility> #include <utility>
#include <vector> #include <vector>
#include "cryptonote_basic/blobdatatype.h"
#include "net/enums.h"
#include "net/net_utils_base.h" #include "net/net_utils_base.h"
#include "p2p_protocol_defs.h" #include "p2p_protocol_defs.h"
@ -46,12 +48,12 @@ namespace nodetool
struct i_p2p_endpoint struct i_p2p_endpoint
{ {
virtual bool relay_notify_to_list(int command, const epee::span<const uint8_t> data_buff, std::vector<std::pair<epee::net_utils::zone, boost::uuids::uuid>> connections)=0; virtual bool relay_notify_to_list(int command, const epee::span<const uint8_t> data_buff, std::vector<std::pair<epee::net_utils::zone, boost::uuids::uuid>> connections)=0;
virtual epee::net_utils::zone send_txs(std::vector<cryptonote::blobdata> txs, const epee::net_utils::zone origin, const boost::uuids::uuid& source, const bool pad_txs)=0;
virtual bool invoke_command_to_peer(int command, const epee::span<const uint8_t> req_buff, std::string& resp_buff, const epee::net_utils::connection_context_base& context)=0; virtual bool invoke_command_to_peer(int command, const epee::span<const uint8_t> req_buff, std::string& resp_buff, const epee::net_utils::connection_context_base& context)=0;
virtual bool invoke_notify_to_peer(int command, const epee::span<const uint8_t> req_buff, const epee::net_utils::connection_context_base& context)=0; virtual bool invoke_notify_to_peer(int command, const epee::span<const uint8_t> req_buff, const epee::net_utils::connection_context_base& context)=0;
virtual bool drop_connection(const epee::net_utils::connection_context_base& context)=0; virtual bool drop_connection(const epee::net_utils::connection_context_base& context)=0;
virtual void request_callback(const epee::net_utils::connection_context_base& context)=0; virtual void request_callback(const epee::net_utils::connection_context_base& context)=0;
virtual uint64_t get_public_connections_count()=0; virtual uint64_t get_public_connections_count()=0;
virtual size_t get_zone_count() const=0;
virtual void for_each_connection(std::function<bool(t_connection_context&, peerid_type, uint32_t)> f)=0; virtual void for_each_connection(std::function<bool(t_connection_context&, peerid_type, uint32_t)> f)=0;
virtual bool for_connection(const boost::uuids::uuid&, std::function<bool(t_connection_context&, peerid_type, uint32_t)> f)=0; virtual bool for_connection(const boost::uuids::uuid&, std::function<bool(t_connection_context&, peerid_type, uint32_t)> f)=0;
virtual bool block_host(const epee::net_utils::network_address &address, time_t seconds = 0)=0; virtual bool block_host(const epee::net_utils::network_address &address, time_t seconds = 0)=0;
@ -71,6 +73,10 @@ namespace nodetool
{ {
return false; return false;
} }
virtual epee::net_utils::zone send_txs(std::vector<cryptonote::blobdata> txs, const epee::net_utils::zone origin, const boost::uuids::uuid& source, const bool pad_txs)
{
return epee::net_utils::zone::invalid;
}
virtual bool invoke_command_to_peer(int command, const epee::span<const uint8_t> req_buff, std::string& resp_buff, const epee::net_utils::connection_context_base& context) virtual bool invoke_command_to_peer(int command, const epee::span<const uint8_t> req_buff, std::string& resp_buff, const epee::net_utils::connection_context_base& context)
{ {
return false; return false;
@ -96,11 +102,6 @@ namespace nodetool
return false; return false;
} }
virtual size_t get_zone_count() const
{
return 0;
}
virtual uint64_t get_public_connections_count() virtual uint64_t get_public_connections_count()
{ {
return false; return false;

1
tests/unit_tests/CMakeLists.txt
View file

@ -56,6 +56,7 @@ set(unit_tests_sources
hmac_keccak.cpp hmac_keccak.cpp
http.cpp http.cpp
keccak.cpp keccak.cpp
levin.cpp
logging.cpp logging.cpp
long_term_block_weight.cpp long_term_block_weight.cpp
lmdb.cpp lmdb.cpp

105
tests/unit_tests/epee_levin_protocol_handler_async.cpp
View file

@ -425,6 +425,95 @@ TEST_F(positive_test_connection_to_levin_protocol_handler_calls, handler_process
ASSERT_EQ(3, m_commands_handler.callback_counter()); ASSERT_EQ(3, m_commands_handler.callback_counter());
} }
TEST_F(positive_test_connection_to_levin_protocol_handler_calls, handler_processes_handle_read_as_dummy)
{
// Setup
const int expected_command = 4673261;
const std::string in_data(256, 'e');
const epee::byte_slice noise = epee::levin::make_noise_notify(1024);
const epee::byte_slice notify = epee::levin::make_notify(expected_command, epee::strspan<std::uint8_t>(in_data));
test_connection_ptr conn = create_connection();
// Test
ASSERT_TRUE(conn->m_protocol_handler.handle_recv(noise.data(), noise.size()));
// Check connection and levin_commands_handler states
ASSERT_EQ(0u, m_commands_handler.notify_counter());
ASSERT_EQ(0u, m_commands_handler.invoke_counter());
ASSERT_EQ(-1, m_commands_handler.last_command());
ASSERT_TRUE(m_commands_handler.last_in_buf().empty());
ASSERT_EQ(0u, conn->send_counter());
ASSERT_TRUE(conn->last_send_data().empty());
ASSERT_TRUE(conn->m_protocol_handler.handle_recv(notify.data(), notify.size()));
// Check connection and levin_commands_handler states
ASSERT_EQ(1u, m_commands_handler.notify_counter());
ASSERT_EQ(0u, m_commands_handler.invoke_counter());
ASSERT_EQ(expected_command, m_commands_handler.last_command());
ASSERT_EQ(in_data, m_commands_handler.last_in_buf());
ASSERT_EQ(0u, conn->send_counter());
ASSERT_TRUE(conn->last_send_data().empty());
}
TEST_F(positive_test_connection_to_levin_protocol_handler_calls, handler_processes_handle_read_as_fragment)
{
// Setup
const int expected_command = 4673261;
const int expected_fragmented_command = 46732;
const std::string in_data(256, 'e');
std::string in_fragmented_data(1024 * 4, 'c');
const epee::byte_slice noise = epee::levin::make_noise_notify(1024);
const epee::byte_slice notify = epee::levin::make_notify(expected_command, epee::strspan<std::uint8_t>(in_data));
epee::byte_slice fragmented = epee::levin::make_fragmented_notify(noise, expected_fragmented_command, epee::strspan<std::uint8_t>(in_fragmented_data));
EXPECT_EQ(5u, fragmented.size() / 1024);
EXPECT_EQ(0u, fragmented.size() % 1024);
test_connection_ptr conn = create_connection();
while (!fragmented.empty())
{
if ((fragmented.size() / 1024) % 2 == 1)
{
ASSERT_TRUE(conn->m_protocol_handler.handle_recv(notify.data(), notify.size()));
}
ASSERT_EQ(3u - (fragmented.size() / 2048), m_commands_handler.notify_counter());
ASSERT_EQ(0u, m_commands_handler.invoke_counter());
ASSERT_EQ(expected_command, m_commands_handler.last_command());
ASSERT_EQ(in_data, m_commands_handler.last_in_buf());
ASSERT_EQ(0u, conn->send_counter());
ASSERT_TRUE(conn->last_send_data().empty());
epee::byte_slice next = fragmented.take_slice(1024);
ASSERT_TRUE(conn->m_protocol_handler.handle_recv(next.data(), next.size()));
}
in_fragmented_data.resize(((1024 - sizeof(epee::levin::bucket_head2)) * 5) - sizeof(epee::levin::bucket_head2)); // add padding zeroes
ASSERT_EQ(4u, m_commands_handler.notify_counter());
ASSERT_EQ(0u, m_commands_handler.invoke_counter());
ASSERT_EQ(expected_fragmented_command, m_commands_handler.last_command());
ASSERT_EQ(in_fragmented_data, m_commands_handler.last_in_buf());
ASSERT_EQ(0u, conn->send_counter());
ASSERT_TRUE(conn->last_send_data().empty());
ASSERT_TRUE(conn->m_protocol_handler.handle_recv(notify.data(), notify.size()));
ASSERT_EQ(5u, m_commands_handler.notify_counter());
ASSERT_EQ(0u, m_commands_handler.invoke_counter());
ASSERT_EQ(expected_command, m_commands_handler.last_command());
ASSERT_EQ(in_data, m_commands_handler.last_in_buf());
ASSERT_EQ(0u, conn->send_counter());
ASSERT_TRUE(conn->last_send_data().empty());
}
TEST_F(test_levin_protocol_handler__hanle_recv_with_invalid_data, handles_big_packet_1) TEST_F(test_levin_protocol_handler__hanle_recv_with_invalid_data, handles_big_packet_1)
{ {
std::string buf("yyyyyy"); std::string buf("yyyyyy");
@ -534,3 +623,19 @@ TEST_F(test_levin_protocol_handler__hanle_recv_with_invalid_data, handles_unexpe
ASSERT_FALSE(m_conn->m_protocol_handler.handle_recv(m_buf.data(), m_buf.size())); ASSERT_FALSE(m_conn->m_protocol_handler.handle_recv(m_buf.data(), m_buf.size()));
} }
TEST_F(test_levin_protocol_handler__hanle_recv_with_invalid_data, handles_short_fragment)
{
m_req_head.m_cb = 1;
m_req_head.m_flags = LEVIN_PACKET_BEGIN;
m_req_head.m_command = 0;
m_in_data.resize(1);
prepare_buf();
ASSERT_TRUE(m_conn->m_protocol_handler.handle_recv(m_buf.data(), m_buf.size()));
m_req_head.m_flags = LEVIN_PACKET_END;
prepare_buf();
ASSERT_FALSE(m_conn->m_protocol_handler.handle_recv(m_buf.data(), m_buf.size()));
}

586
tests/unit_tests/levin.cpp Normal file
View file

@ -0,0 +1,586 @@
// Copyright (c) 2019, 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 <algorithm>
#include <boost/uuid/nil_generator.hpp>
#include <boost/uuid/random_generator.hpp>
#include <boost/uuid/uuid.hpp>
#include <cstring>
#include <gtest/gtest.h>
#include <limits>
#include <set>
#include "byte_slice.h"
#include "crypto/crypto.h"
#include "cryptonote_basic/connection_context.h"
#include "cryptonote_protocol/cryptonote_protocol_defs.h"
#include "cryptonote_protocol/levin_notify.h"
#include "int-util.h"
#include "p2p/net_node.h"
#include "net/dandelionpp.h"
#include "net/levin_base.h"
#include "span.h"
namespace
{
class test_endpoint final : public epee::net_utils::i_service_endpoint
{
boost::asio::io_service& io_service_;
std::size_t ref_count_;
virtual bool do_send(epee::byte_slice message) override final
{
send_queue_.push_back(std::move(message));
return true;
}
virtual bool close() override final
{
return true;
}
virtual bool send_done() override final
{
throw std::logic_error{"send_done not implemented"};
}
virtual bool call_run_once_service_io() override final
{
return io_service_.run_one();
}
virtual bool request_callback() override final
{
throw std::logic_error{"request_callback not implemented"};
}
virtual boost::asio::io_service& get_io_service() override final
{
return io_service_;
}
virtual bool add_ref() override final
{
++ref_count_;
return true;
}
virtual bool release() override final
{
--ref_count_;
return true;
}
public:
test_endpoint(boost::asio::io_service& io_service)
: epee::net_utils::i_service_endpoint(),
io_service_(io_service),
ref_count_(0),
send_queue_()
{}
virtual ~test_endpoint() noexcept(false) override final
{
EXPECT_EQ(0u, ref_count_);
}
std::deque<epee::byte_slice> send_queue_;
};
class test_connection
{
test_endpoint endpoint_;
cryptonote::levin::detail::p2p_context context_;
epee::levin::async_protocol_handler<cryptonote::levin::detail::p2p_context> handler_;
public:
test_connection(boost::asio::io_service& io_service, cryptonote::levin::connections& connections, boost::uuids::random_generator& random_generator)
: context_(),
endpoint_(io_service),
handler_(std::addressof(endpoint_), connections, context_)
{
const_cast<boost::uuids::uuid&>(context_.m_connection_id) = random_generator();
handler_.after_init_connection();
}
//\return Number of messages processed
std::size_t process_send_queue()
{
std::size_t count = 0;
for ( ; !endpoint_.send_queue_.empty(); ++count, endpoint_.send_queue_.pop_front())
{
// invalid messages shoudn't be possible in this test;
EXPECT_TRUE(handler_.handle_recv(endpoint_.send_queue_.front().data(), endpoint_.send_queue_.front().size()));
}
return count;
}
const boost::uuids::uuid& get_id() const noexcept
{
return context_.m_connection_id;
}
};
struct received_message
{
boost::uuids::uuid connection;
int command;
std::string payload;
};
class test_receiver : public epee::levin::levin_commands_handler<cryptonote::levin::detail::p2p_context>
{
std::deque<received_message> invoked_;
std::deque<received_message> notified_;
template<typename T>
static std::pair<boost::uuids::uuid, typename T::request> get_message(std::deque<received_message>& queue)
{
if (queue.empty())
throw std::logic_error{"Queue has no received messges"};
if (queue.front().command != T::ID)
throw std::logic_error{"Unexpected ID at front of message queue"};
epee::serialization::portable_storage storage{};
if(!storage.load_from_binary(epee::strspan<std::uint8_t>(queue.front().payload)))
throw std::logic_error{"Unable to parse epee binary format"};
typename T::request request{};
if (!request.load(storage))
throw std::logic_error{"Unable to load into expected request"};
boost::uuids::uuid connection = queue.front().connection;
queue.pop_front();
return {connection, std::move(request)};
}
virtual int invoke(int command, const epee::span<const uint8_t> in_buff, std::string& buff_out, cryptonote::levin::detail::p2p_context& context) override final
{
buff_out.clear();
invoked_.push_back(
{context.m_connection_id, command, std::string{reinterpret_cast<const char*>(in_buff.data()), in_buff.size()}}
);
return 1;
}
virtual int notify(int command, const epee::span<const uint8_t> in_buff, cryptonote::levin::detail::p2p_context& context) override final
{
notified_.push_back(
{context.m_connection_id, command, std::string{reinterpret_cast<const char*>(in_buff.data()), in_buff.size()}}
);
return 1;
}
virtual void callback(cryptonote::levin::detail::p2p_context& context) override final
{}
virtual void on_connection_new(cryptonote::levin::detail::p2p_context&) override final
{}
virtual void on_connection_close(cryptonote::levin::detail::p2p_context&) override final
{}
public:
test_receiver()
: epee::levin::levin_commands_handler<cryptonote::levin::detail::p2p_context>(),
invoked_(),
notified_()
{}
virtual ~test_receiver() noexcept override final{}
std::size_t invoked_size() const noexcept
{
return invoked_.size();
}
std::size_t notified_size() const noexcept
{
return notified_.size();
}
template<typename T>
std::pair<boost::uuids::uuid, typename T::request> get_invoked()
{
return get_message<T>(invoked_);
}
template<typename T>
std::pair<boost::uuids::uuid, typename T::request> get_notification()
{
return get_message<T>(notified_);
}
};
class levin_notify : public ::testing::Test
{
const std::shared_ptr<cryptonote::levin::connections> connections_;
std::set<boost::uuids::uuid> connection_ids_;
public:
levin_notify()
: ::testing::Test(),
connections_(std::make_shared<cryptonote::levin::connections>()),
connection_ids_(),
random_generator_(),
io_service_(),
receiver_(),
contexts_()
{
connections_->set_handler(std::addressof(receiver_), nullptr);
}
virtual void TearDown() override final
{
EXPECT_EQ(0u, receiver_.invoked_size());
EXPECT_EQ(0u, receiver_.notified_size());
}
void add_connection()
{
contexts_.emplace_back(io_service_, *connections_, random_generator_);
EXPECT_TRUE(connection_ids_.emplace(contexts_.back().get_id()).second);
EXPECT_EQ(connection_ids_.size(), connections_->get_connections_count());
}
cryptonote::levin::notify make_notifier(const std::size_t noise_size)
{
epee::byte_slice noise = nullptr;
if (noise_size)
noise = epee::levin::make_noise_notify(noise_size);
return cryptonote::levin::notify{io_service_, connections_, std::move(noise)};
}
boost::uuids::random_generator random_generator_;
boost::asio::io_service io_service_;
test_receiver receiver_;
std::deque<test_connection> contexts_;
};
}
TEST(make_header, no_expect_return)
{
static constexpr const std::size_t max_length = std::numeric_limits<std::size_t>::max();
const epee::levin::bucket_head2 header1 = epee::levin::make_header(1024, max_length, 5601, false);
EXPECT_EQ(SWAP64LE(LEVIN_SIGNATURE), header1.m_signature);
EXPECT_FALSE(header1.m_have_to_return_data);
EXPECT_EQ(SWAP64LE(max_length), header1.m_cb);
EXPECT_EQ(SWAP32LE(1024), header1.m_command);
EXPECT_EQ(SWAP32LE(LEVIN_PROTOCOL_VER_1), header1.m_protocol_version);
EXPECT_EQ(SWAP32LE(5601), header1.m_flags);
}
TEST(make_header, expect_return)
{
const epee::levin::bucket_head2 header1 = epee::levin::make_header(65535, 0, 0, true);
EXPECT_EQ(SWAP64LE(LEVIN_SIGNATURE), header1.m_signature);
EXPECT_TRUE(header1.m_have_to_return_data);
EXPECT_EQ(0u, header1.m_cb);
EXPECT_EQ(SWAP32LE(65535), header1.m_command);
EXPECT_EQ(SWAP32LE(LEVIN_PROTOCOL_VER_1), header1.m_protocol_version);
EXPECT_EQ(0u, header1.m_flags);
}
TEST(make_notify, empty_payload)
{
const epee::byte_slice message = epee::levin::make_notify(443, nullptr);
const epee::levin::bucket_head2 header =
epee::levin::make_header(443, 0, LEVIN_PACKET_REQUEST, false);
ASSERT_EQ(sizeof(header), message.size());
EXPECT_TRUE(std::memcmp(std::addressof(header), message.data(), sizeof(header)) == 0);
}
TEST(make_notify, with_payload)
{
std::string bytes(100, 'a');
std::generate(bytes.begin(), bytes.end(), crypto::random_device{});
const epee::byte_slice message = epee::levin::make_notify(443, epee::strspan<std::uint8_t>(bytes));
const epee::levin::bucket_head2 header =
epee::levin::make_header(443, bytes.size(), LEVIN_PACKET_REQUEST, false);
ASSERT_EQ(sizeof(header) + bytes.size(), message.size());
EXPECT_TRUE(std::memcmp(std::addressof(header), message.data(), sizeof(header)) == 0);
EXPECT_TRUE(std::memcmp(bytes.data(), message.data() + sizeof(header), bytes.size()) == 0);
}
TEST(make_noise, invalid)
{
EXPECT_TRUE(epee::levin::make_noise_notify(sizeof(epee::levin::bucket_head2) - 1).empty());
}
TEST(make_noise, valid)
{
static constexpr const std::uint32_t flags =
LEVIN_PACKET_BEGIN | LEVIN_PACKET_END;
const epee::byte_slice noise = epee::levin::make_noise_notify(1024);
const epee::levin::bucket_head2 header =
epee::levin::make_header(0, 1024 - sizeof(epee::levin::bucket_head2), flags, false);
ASSERT_EQ(1024, noise.size());
EXPECT_TRUE(std::memcmp(std::addressof(header), noise.data(), sizeof(header)) == 0);
EXPECT_EQ(1024 - sizeof(header), std::count(noise.cbegin() + sizeof(header), noise.cend(), 0));
}
TEST(make_fragment, invalid)
{
EXPECT_TRUE(epee::levin::make_fragmented_notify(nullptr, 0, nullptr).empty());
}
TEST(make_fragment, single)
{
const epee::byte_slice noise = epee::levin::make_noise_notify(1024);
const epee::byte_slice fragment = epee::levin::make_fragmented_notify(noise, 11, nullptr);
const epee::levin::bucket_head2 header =
epee::levin::make_header(11, 1024 - sizeof(epee::levin::bucket_head2), LEVIN_PACKET_REQUEST, false);
EXPECT_EQ(1024, noise.size());
ASSERT_EQ(1024, fragment.size());
EXPECT_TRUE(std::memcmp(std::addressof(header), fragment.data(), sizeof(header)) == 0);
EXPECT_EQ(1024 - sizeof(header), std::count(noise.cbegin() + sizeof(header), noise.cend(), 0));
}
TEST(make_fragment, multiple)
{
std::string bytes(1024 * 3 - 150, 'a');
std::generate(bytes.begin(), bytes.end(), crypto::random_device{});
const epee::byte_slice noise = epee::levin::make_noise_notify(1024);
epee::byte_slice fragment = epee::levin::make_fragmented_notify(noise, 114, epee::strspan<std::uint8_t>(bytes));
epee::levin::bucket_head2 header =
epee::levin::make_header(0, 1024 - sizeof(epee::levin::bucket_head2), LEVIN_PACKET_BEGIN, false);
ASSERT_LE(sizeof(header), fragment.size());
EXPECT_TRUE(std::memcmp(std::addressof(header), fragment.data(), sizeof(header)) == 0);
fragment.take_slice(sizeof(header));
header.m_flags = LEVIN_PACKET_REQUEST;
header.m_cb = bytes.size();
header.m_command = 114;
ASSERT_LE(sizeof(header), fragment.size());
EXPECT_TRUE(std::memcmp(std::addressof(header), fragment.data(), sizeof(header)) == 0);
fragment.take_slice(sizeof(header));
ASSERT_LE(bytes.size(), fragment.size());
EXPECT_TRUE(std::memcmp(bytes.data(), fragment.data(), 1024 - sizeof(header) * 2) == 0);
bytes.erase(0, 1024 - sizeof(header) * 2);
fragment.take_slice(1024 - sizeof(header) * 2);
header.m_flags = 0;
header.m_cb = 1024 - sizeof(header);
header.m_command = 0;
ASSERT_LE(sizeof(header), fragment.size());
EXPECT_TRUE(std::memcmp(std::addressof(header), fragment.data(), sizeof(header)) == 0);
fragment.take_slice(sizeof(header));
ASSERT_LE(bytes.size(), fragment.size());
EXPECT_TRUE(std::memcmp(bytes.data(), fragment.data(), 1024 - sizeof(header)) == 0);
bytes.erase(0, 1024 - sizeof(header));
fragment.take_slice(1024 - sizeof(header));
header.m_flags = LEVIN_PACKET_END;
ASSERT_LE(sizeof(header), fragment.size());
EXPECT_TRUE(std::memcmp(std::addressof(header), fragment.data(), sizeof(header)) == 0);
fragment.take_slice(sizeof(header));
EXPECT_TRUE(std::memcmp(bytes.data(), fragment.data(), bytes.size()) == 0);
fragment.take_slice(bytes.size());
EXPECT_EQ(18, std::count(fragment.cbegin(), fragment.cend(), 0));
}
TEST_F(levin_notify, defaulted)
{
cryptonote::levin::notify notifier{};
{
const auto status = notifier.get_status();
EXPECT_FALSE(status.has_noise);
EXPECT_FALSE(status.connections_filled);
}
EXPECT_FALSE(notifier.send_txs({}, random_generator_(), false));
}
TEST_F(levin_notify, flood)
{
cryptonote::levin::notify notifier = make_notifier(0);
for (unsigned count = 0; count < 10; ++count)
add_connection();
{
const auto status = notifier.get_status();
EXPECT_FALSE(status.has_noise);
EXPECT_FALSE(status.connections_filled);
}
notifier.new_out_connection();
io_service_.poll();
{
const auto status = notifier.get_status();
EXPECT_FALSE(status.has_noise);
EXPECT_FALSE(status.connections_filled); // not tracked
}
std::vector<cryptonote::blobdata> txs(2);
txs[0].resize(100, 'e');
txs[1].resize(200, 'f');
ASSERT_EQ(10u, contexts_.size());
{
auto context = contexts_.begin();
EXPECT_TRUE(notifier.send_txs(txs, context->get_id(), false));
io_service_.reset();
ASSERT_LT(0u, io_service_.poll());
EXPECT_EQ(0u, context->process_send_queue());
for (++context; context != contexts_.end(); ++context)
EXPECT_EQ(1u, context->process_send_queue());
ASSERT_EQ(9u, receiver_.notified_size());
for (unsigned count = 0; count < 9; ++count)
{
auto notification = receiver_.get_notification<cryptonote::NOTIFY_NEW_TRANSACTIONS>().second;
EXPECT_EQ(txs, notification.txs);
EXPECT_TRUE(notification._.empty());
}
}
ASSERT_EQ(10u, contexts_.size());
{
auto context = contexts_.begin();
EXPECT_TRUE(notifier.send_txs(txs, context->get_id(), true));
io_service_.reset();
ASSERT_LT(0u, io_service_.poll());
EXPECT_EQ(0u, context->process_send_queue());
for (++context; context != contexts_.end(); ++context)
EXPECT_EQ(1u, context->process_send_queue());
ASSERT_EQ(9u, receiver_.notified_size());
for (unsigned count = 0; count < 9; ++count)
{
auto notification = receiver_.get_notification<cryptonote::NOTIFY_NEW_TRANSACTIONS>().second;
EXPECT_EQ(txs, notification.txs);
EXPECT_FALSE(notification._.empty());
}
}
}
TEST_F(levin_notify, noise)
{
for (unsigned count = 0; count < 10; ++count)
add_connection();
std::vector<cryptonote::blobdata> txs(1);
txs[0].resize(1900, 'h');
const boost::uuids::uuid incoming_id = random_generator_();
cryptonote::levin::notify notifier = make_notifier(2048);
{
const auto status = notifier.get_status();
EXPECT_TRUE(status.has_noise);
EXPECT_FALSE(status.connections_filled);
}
ASSERT_LT(0u, io_service_.poll());
{
const auto status = notifier.get_status();
EXPECT_TRUE(status.has_noise);
EXPECT_TRUE(status.connections_filled);
}
notifier.run_stems();
io_service_.reset();
ASSERT_LT(0u, io_service_.poll());
{
std::size_t sent = 0;
for (auto& context : contexts_)
sent += context.process_send_queue();
EXPECT_EQ(2u, sent);
EXPECT_EQ(0u, receiver_.notified_size());
}
EXPECT_TRUE(notifier.send_txs(txs, incoming_id, false));
notifier.run_stems();
io_service_.reset();
ASSERT_LT(0u, io_service_.poll());
{
std::size_t sent = 0;
for (auto& context : contexts_)
sent += context.process_send_queue();
ASSERT_EQ(2u, sent);
while (sent--)
{
auto notification = receiver_.get_notification<cryptonote::NOTIFY_NEW_TRANSACTIONS>().second;
EXPECT_EQ(txs, notification.txs);
EXPECT_TRUE(notification._.empty());
}
}
txs[0].resize(3000, 'r');
EXPECT_TRUE(notifier.send_txs(txs, incoming_id, true));
notifier.run_stems();
io_service_.reset();
ASSERT_LT(0u, io_service_.poll());
{
std::size_t sent = 0;
for (auto& context : contexts_)
sent += context.process_send_queue();
EXPECT_EQ(2u, sent);
EXPECT_EQ(0u, receiver_.notified_size());
}
notifier.run_stems();
io_service_.reset();
ASSERT_LT(0u, io_service_.poll());
{
std::size_t sent = 0;
for (auto& context : contexts_)
sent += context.process_send_queue();
ASSERT_EQ(2u, sent);
while (sent--)
{
auto notification = receiver_.get_notification<cryptonote::NOTIFY_NEW_TRANSACTIONS>().second;
EXPECT_EQ(txs, notification.txs);
EXPECT_TRUE(notification._.empty());
}
}
}

396
tests/unit_tests/net.cpp
View file

@ -26,6 +26,7 @@
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF // 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. // THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include <algorithm>
#include <atomic> #include <atomic>
#include <boost/archive/portable_binary_oarchive.hpp> #include <boost/archive/portable_binary_oarchive.hpp>
#include <boost/archive/portable_binary_iarchive.hpp> #include <boost/archive/portable_binary_iarchive.hpp>
@ -36,13 +37,22 @@
#include <boost/asio/steady_timer.hpp> #include <boost/asio/steady_timer.hpp>
#include <boost/asio/write.hpp> #include <boost/asio/write.hpp>
#include <boost/endian/conversion.hpp> #include <boost/endian/conversion.hpp>
#include <boost/range/adaptor/sliced.hpp>
#include <boost/range/combine.hpp>
#include <boost/system/error_code.hpp> #include <boost/system/error_code.hpp>
#include <boost/thread/thread.hpp> #include <boost/thread/thread.hpp>
#include <boost/uuid/nil_generator.hpp>
#include <boost/uuid/random_generator.hpp>
#include <boost/uuid/uuid.hpp>
#include <cstdint>
#include <cstring> #include <cstring>
#include <functional> #include <functional>
#include <gtest/gtest.h> #include <gtest/gtest.h>
#include <map>
#include <memory> #include <memory>
#include <type_traits>
#include "net/dandelionpp.h"
#include "net/error.h" #include "net/error.h"
#include "net/net_utils_base.h" #include "net/net_utils_base.h"
#include "net/socks.h" #include "net/socks.h"
@ -857,3 +867,389 @@ TEST(socks_connector, timeout)
EXPECT_THROW(sock.get().is_open(), boost::system::system_error); EXPECT_THROW(sock.get().is_open(), boost::system::system_error);
} }
TEST(dandelionpp_map, traits)
{
EXPECT_TRUE(std::is_default_constructible<net::dandelionpp::connection_map>());
EXPECT_TRUE(std::is_move_constructible<net::dandelionpp::connection_map>());
EXPECT_TRUE(std::is_move_assignable<net::dandelionpp::connection_map>());
EXPECT_FALSE(std::is_copy_constructible<net::dandelionpp::connection_map>());
EXPECT_FALSE(std::is_copy_assignable<net::dandelionpp::connection_map>());
}
TEST(dandelionpp_map, empty)
{
const net::dandelionpp::connection_map mapper{};
EXPECT_EQ(mapper.begin(), mapper.end());
EXPECT_EQ(0u, mapper.size());
const net::dandelionpp::connection_map cloned = mapper.clone();
EXPECT_EQ(cloned.begin(), cloned.end());
EXPECT_EQ(0u, cloned.size());
}
TEST(dandelionpp_map, zero_stems)
{
std::vector<boost::uuids::uuid> connections{6};
std::generate(connections.begin(), connections.end(), boost::uuids::random_generator{});
net::dandelionpp::connection_map mapper{connections, 0};
EXPECT_EQ(mapper.begin(), mapper.end());
EXPECT_EQ(0u, mapper.size());
for (const boost::uuids::uuid& connection : connections)
EXPECT_TRUE(mapper.get_stem(connection).is_nil());
EXPECT_FALSE(mapper.update(connections));
EXPECT_EQ(mapper.begin(), mapper.end());
EXPECT_EQ(0u, mapper.size());
for (const boost::uuids::uuid& connection : connections)
EXPECT_TRUE(mapper.get_stem(connection).is_nil());
const net::dandelionpp::connection_map cloned = mapper.clone();
EXPECT_EQ(cloned.end(), cloned.begin());
EXPECT_EQ(0u, cloned.size());
}
TEST(dandelionpp_map, dropped_connection)
{
std::vector<boost::uuids::uuid> connections{6};
std::generate(connections.begin(), connections.end(), boost::uuids::random_generator{});
std::sort(connections.begin(), connections.end());
// select 3 of 6 outgoing connections
net::dandelionpp::connection_map mapper{connections, 3};
EXPECT_EQ(3u, mapper.size());
EXPECT_EQ(3, mapper.end() - mapper.begin());
{
std::set<boost::uuids::uuid> used;
for (const boost::uuids::uuid& connection : mapper)
{
EXPECT_TRUE(used.insert(connection).second);
EXPECT_TRUE(std::binary_search(connections.begin(), connections.end(), connection));
}
}
{
const net::dandelionpp::connection_map cloned = mapper.clone();
EXPECT_EQ(3u, cloned.size());
ASSERT_EQ(mapper.end() - mapper.begin(), cloned.end() - cloned.begin());
for (auto elem : boost::combine(mapper, cloned))
EXPECT_EQ(boost::get<0>(elem), boost::get<1>(elem));
}
EXPECT_FALSE(mapper.update(connections));
EXPECT_EQ(3u, mapper.size());
ASSERT_EQ(3, mapper.end() - mapper.begin());
{
std::set<boost::uuids::uuid> used;
for (const boost::uuids::uuid& connection : mapper)
{
EXPECT_FALSE(connection.is_nil());
EXPECT_TRUE(used.insert(connection).second);
EXPECT_TRUE(std::binary_search(connections.begin(), connections.end(), connection));
}
}
std::map<boost::uuids::uuid, boost::uuids::uuid> mapping;
std::vector<boost::uuids::uuid> in_connections{9};
std::generate(in_connections.begin(), in_connections.end(), boost::uuids::random_generator{});
{
std::map<boost::uuids::uuid, std::size_t> used;
std::multimap<boost::uuids::uuid, boost::uuids::uuid> inverse_mapping;
for (const boost::uuids::uuid& connection : in_connections)
{
const boost::uuids::uuid out = mapper.get_stem(connection);
EXPECT_FALSE(out.is_nil());
EXPECT_TRUE(mapping.emplace(connection, out).second);
inverse_mapping.emplace(out, connection);
used[out]++;
}
EXPECT_EQ(3u, used.size());
for (const std::pair<boost::uuids::uuid, std::size_t>& entry : used)
EXPECT_EQ(3u, entry.second);
for (const boost::uuids::uuid& connection : in_connections)
EXPECT_EQ(mapping[connection], mapper.get_stem(connection));
// drop 1 connection, and select replacement from 1 of unused 3.
const boost::uuids::uuid lost_connection = *(++mapper.begin());
const auto elem = std::lower_bound(connections.begin(), connections.end(), lost_connection);
ASSERT_NE(connections.end(), elem);
ASSERT_EQ(lost_connection, *elem);
connections.erase(elem);
EXPECT_TRUE(mapper.update(connections));
EXPECT_EQ(3u, mapper.size());
ASSERT_EQ(3, mapper.end() - mapper.begin());
for (const boost::uuids::uuid& connection : mapper)
{
EXPECT_FALSE(connection.is_nil());
EXPECT_NE(lost_connection, connection);
}
const boost::uuids::uuid newly_mapped = *(++mapper.begin());
EXPECT_FALSE(newly_mapped.is_nil());
EXPECT_NE(lost_connection, newly_mapped);
for (auto elems = inverse_mapping.equal_range(lost_connection); elems.first != elems.second; ++elems.first)
mapping[elems.first->second] = newly_mapped;
}
{
const net::dandelionpp::connection_map cloned = mapper.clone();
EXPECT_EQ(3u, cloned.size());
ASSERT_EQ(mapper.end() - mapper.begin(), cloned.end() - cloned.begin());
for (auto elem : boost::combine(mapper, cloned))
EXPECT_EQ(boost::get<0>(elem), boost::get<1>(elem));
}
// mappings should remain evenly distributed amongst 2, with 3 sitting in waiting
{
std::set<boost::uuids::uuid> used;
for (const boost::uuids::uuid& connection : mapper)
{
EXPECT_FALSE(connection.is_nil());
EXPECT_TRUE(used.insert(connection).second);
EXPECT_TRUE(std::binary_search(connections.begin(), connections.end(), connection));
}
}
{
std::map<boost::uuids::uuid, std::size_t> used;
for (const boost::uuids::uuid& connection : in_connections)
{
const boost::uuids::uuid& out = mapper.get_stem(connection);
EXPECT_FALSE(out.is_nil());
EXPECT_EQ(mapping[connection], out);
used[out]++;
}
EXPECT_EQ(3u, used.size());
for (const std::pair<boost::uuids::uuid, std::size_t>& entry : used)
EXPECT_EQ(3u, entry.second);
}
{
const net::dandelionpp::connection_map cloned = mapper.clone();
EXPECT_EQ(3u, cloned.size());
ASSERT_EQ(mapper.end() - mapper.begin(), cloned.end() - cloned.begin());
for (auto elem : boost::combine(mapper, cloned))
EXPECT_EQ(boost::get<0>(elem), boost::get<1>(elem));
}
}
TEST(dandelionpp_map, dropped_connection_remapped)
{
boost::uuids::random_generator random_uuid{};
std::vector<boost::uuids::uuid> connections{3};
std::generate(connections.begin(), connections.end(), random_uuid);
std::sort(connections.begin(), connections.end());
// select 3 of 3 outgoing connections
net::dandelionpp::connection_map mapper{connections, 3};
EXPECT_EQ(3u, mapper.size());
EXPECT_EQ(3, mapper.end() - mapper.begin());
{
std::set<boost::uuids::uuid> used;
for (const boost::uuids::uuid& connection : mapper)
{
EXPECT_FALSE(connection.is_nil());
EXPECT_TRUE(used.insert(connection).second);
EXPECT_TRUE(std::binary_search(connections.begin(), connections.end(), connection));
}
}
EXPECT_FALSE(mapper.update(connections));
EXPECT_EQ(3u, mapper.size());
ASSERT_EQ(3, mapper.end() - mapper.begin());
{
std::set<boost::uuids::uuid> used;
for (const boost::uuids::uuid& connection : mapper)
{
EXPECT_FALSE(connection.is_nil());
EXPECT_TRUE(used.insert(connection).second);
EXPECT_TRUE(std::binary_search(connections.begin(), connections.end(), connection));
}
}
std::map<boost::uuids::uuid, boost::uuids::uuid> mapping;
std::vector<boost::uuids::uuid> in_connections{9};
std::generate(in_connections.begin(), in_connections.end(), random_uuid);
{
std::map<boost::uuids::uuid, std::size_t> used;
std::multimap<boost::uuids::uuid, boost::uuids::uuid> inverse_mapping;
for (const boost::uuids::uuid& connection : in_connections)
{
const boost::uuids::uuid out = mapper.get_stem(connection);
EXPECT_FALSE(out.is_nil());
EXPECT_TRUE(mapping.emplace(connection, out).second);
inverse_mapping.emplace(out, connection);
used[out]++;
}
EXPECT_EQ(3u, used.size());
for (const std::pair<boost::uuids::uuid, std::size_t>& entry : used)
EXPECT_EQ(3u, entry.second);
for (const boost::uuids::uuid& connection : in_connections)
EXPECT_EQ(mapping[connection], mapper.get_stem(connection));
// drop 1 connection leaving "hole"
const boost::uuids::uuid lost_connection = *(++mapper.begin());
const auto elem = std::lower_bound(connections.begin(), connections.end(), lost_connection);
ASSERT_NE(connections.end(), elem);
ASSERT_EQ(lost_connection, *elem);
connections.erase(elem);
EXPECT_TRUE(mapper.update(connections));
EXPECT_EQ(2u, mapper.size());
EXPECT_EQ(3, mapper.end() - mapper.begin());
for (auto elems = inverse_mapping.equal_range(lost_connection); elems.first != elems.second; ++elems.first)
mapping[elems.first->second] = boost::uuids::nil_uuid();
}
// remap 3 connections and map 1 new connection to 2 remaining out connections
in_connections.resize(10);
in_connections[9] = random_uuid();
{
std::map<boost::uuids::uuid, std::size_t> used;
for (const boost::uuids::uuid& connection : in_connections)
{
const boost::uuids::uuid& out = mapper.get_stem(connection);
EXPECT_FALSE(out.is_nil());
used[out]++;
boost::uuids::uuid& expected = mapping[connection];
if (!expected.is_nil())
EXPECT_EQ(expected, out);
else
expected = out;
}
EXPECT_EQ(2u, used.size());
for (const std::pair<boost::uuids::uuid, std::size_t>& entry : used)
EXPECT_EQ(5u, entry.second);
}
// select 3 of 3 connections but do not remap existing links
connections.resize(3);
connections[2] = random_uuid();
EXPECT_TRUE(mapper.update(connections));
EXPECT_EQ(3u, mapper.size());
EXPECT_EQ(3, mapper.end() - mapper.begin());
{
std::map<boost::uuids::uuid, std::size_t> used;
for (const boost::uuids::uuid& connection : in_connections)
{
const boost::uuids::uuid& out = mapper.get_stem(connection);
EXPECT_FALSE(out.is_nil());
used[out]++;
EXPECT_EQ(mapping[connection], out);
}
EXPECT_EQ(2u, used.size());
for (const std::pair<boost::uuids::uuid, std::size_t>& entry : used)
EXPECT_EQ(5u, entry.second);
}
// map 8 new incoming connections across 3 outgoing links
in_connections.resize(18);
std::generate(in_connections.begin() + 10, in_connections.end(), random_uuid);
{
std::map<boost::uuids::uuid, std::size_t> used;
for (const boost::uuids::uuid& connection : in_connections)
{
const boost::uuids::uuid& out = mapper.get_stem(connection);
EXPECT_FALSE(out.is_nil());
used[out]++;
boost::uuids::uuid& expected = mapping[connection];
if (!expected.is_nil())
EXPECT_EQ(expected, out);
else
expected = out;
}
EXPECT_EQ(3u, used.size());
for (const std::pair<boost::uuids::uuid, std::size_t>& entry : used)
EXPECT_EQ(6u, entry.second);
}
}
TEST(dandelionpp_map, dropped_all_connections)
{
boost::uuids::random_generator random_uuid{};
std::vector<boost::uuids::uuid> connections{8};
std::generate(connections.begin(), connections.end(), random_uuid);
std::sort(connections.begin(), connections.end());
// select 3 of 8 outgoing connections
net::dandelionpp::connection_map mapper{connections, 3};
EXPECT_EQ(3u, mapper.size());
EXPECT_EQ(3, mapper.end() - mapper.begin());
{
std::set<boost::uuids::uuid> used;
for (const boost::uuids::uuid& connection : mapper)
{
EXPECT_FALSE(connection.is_nil());
EXPECT_TRUE(used.insert(connection).second);
EXPECT_TRUE(std::binary_search(connections.begin(), connections.end(), connection));
}
}
EXPECT_FALSE(mapper.update(connections));
EXPECT_EQ(3u, mapper.size());
ASSERT_EQ(3, mapper.end() - mapper.begin());
{
std::set<boost::uuids::uuid> used;
for (const boost::uuids::uuid& connection : mapper)
{
EXPECT_FALSE(connection.is_nil());
EXPECT_TRUE(used.insert(connection).second);
EXPECT_TRUE(std::binary_search(connections.begin(), connections.end(), connection));
}
}
std::vector<boost::uuids::uuid> in_connections{9};
std::generate(in_connections.begin(), in_connections.end(), random_uuid);
{
std::map<boost::uuids::uuid, std::size_t> used;
std::map<boost::uuids::uuid, boost::uuids::uuid> mapping;
for (const boost::uuids::uuid& connection : in_connections)
{
const boost::uuids::uuid out = mapper.get_stem(connection);
EXPECT_FALSE(out.is_nil());
EXPECT_TRUE(mapping.emplace(connection, out).second);
used[out]++;
}
EXPECT_EQ(3u, used.size());
for (const std::pair<boost::uuids::uuid, std::size_t>& entry : used)
EXPECT_EQ(3u, entry.second);
for (const boost::uuids::uuid& connection : in_connections)
EXPECT_EQ(mapping[connection], mapper.get_stem(connection));
// drop all connections
connections.clear();
EXPECT_TRUE(mapper.update(connections));
EXPECT_EQ(0u, mapper.size());
EXPECT_EQ(3, mapper.end() - mapper.begin());
}
// remap 7 connections to nothing
for (const boost::uuids::uuid& connection : boost::adaptors::slice(in_connections, 0, 7))
EXPECT_TRUE(mapper.get_stem(connection).is_nil());
// select 3 of 30 connections, only 7 should be remapped to new indexes (but all to new uuids)
connections.resize(30);
std::generate(connections.begin(), connections.end(), random_uuid);
EXPECT_TRUE(mapper.update(connections));
{
std::map<boost::uuids::uuid, std::size_t> used;
for (const boost::uuids::uuid& connection : in_connections)
{
const boost::uuids::uuid& out = mapper.get_stem(connection);
EXPECT_FALSE(out.is_nil());
used[out]++;
}
EXPECT_EQ(3u, used.size());
for (const std::pair<boost::uuids::uuid, std::size_t>& entry : used)
EXPECT_EQ(3u, entry.second);
}
}