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feat/606-enable-nat-traversal-via-hole-punching (#668)

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* feat: base implementation of dcutr for hole-punching

* chore: removed circuit-relay imports from __init__

* feat: implemented dcutr protocol

* added test suite with mock setup

* Fix pre-commit hook issues in DCUtR implementation

* usages of CONNECT_TYPE and SYNC_TYPE have been replaced with HolePunch.Type.CONNECT and HolePunch.Type.SYNC

* added unit tests for dcutr and nat module and

* added multiaddr.get_peer_id() with proper DNS address handling and fixed method signature inconsistencies

* added assertions to verify DCUtR hole punch result in integration test

---------

Co-authored-by: Manu Sheel Gupta <manusheel.edu@gmail.com>
This commit is contained in:
Soham Bhoir
2025-08-08 06:30:16 +05:30
committed by GitHub
parent 9ed44f5fa3
commit cb11f076c8
14 changed files with 2099 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
Makefile
View File

@ -60,6 +60,7 @@ PB = libp2p/crypto/pb/crypto.proto \
libp2p/identity/identify/pb/identify.proto \
libp2p/host/autonat/pb/autonat.proto \
libp2p/relay/circuit_v2/pb/circuit.proto \
libp2p/relay/circuit_v2/pb/dcutr.proto \
libp2p/kad_dht/pb/kademlia.proto
PY = $(PB:.proto=_pb2.py)

8
libp2p/abc.py
View File

@ -357,6 +357,14 @@ class INetConn(Closer):
:return: A tuple containing instances of INetStream.
"""
@abstractmethod
def get_transport_addresses(self) -> list[Multiaddr]:
"""
Retrieve the transport addresses used by this connection.
:return: A list of multiaddresses used by the transport.
"""
# -------------------------- peermetadata interface.py --------------------------

19
libp2p/network/connection/swarm_connection.py
View File

@ -3,6 +3,7 @@ from typing import (
TYPE_CHECKING,
)
from multiaddr import Multiaddr
import trio
from libp2p.abc import (
@ -147,6 +148,24 @@ class SwarmConn(INetConn):
def get_streams(self) -> tuple[NetStream, ...]:
return tuple(self.streams)
def get_transport_addresses(self) -> list[Multiaddr]:
"""
Retrieve the transport addresses used by this connection.
Returns
-------
list[Multiaddr]
A list of multiaddresses used by the transport.
"""
# Return the addresses from the peerstore for this peer
try:
peer_id = self.muxed_conn.peer_id
return self.swarm.peerstore.addrs(peer_id)
except Exception as e:
logging.warning(f"Error getting transport addresses: {e}")
return []
def remove_stream(self, stream: NetStream) -> None:
if stream not in self.streams:
return

9
libp2p/relay/__init__.py
View File

@ -15,6 +15,10 @@ from libp2p.relay.circuit_v2 import (
RelayLimits,
RelayResourceManager,
Reservation,
DCUTR_PROTOCOL_ID,
DCUtRProtocol,
ReachabilityChecker,
is_private_ip,
)
__all__ = [
@ -25,4 +29,9 @@ __all__ = [
"RelayLimits",
"RelayResourceManager",
"Reservation",
"DCUtRProtocol",
"DCUTR_PROTOCOL_ID",
"ReachabilityChecker",
"is_private_ip"
]

14
libp2p/relay/circuit_v2/__init__.py
View File

@ -5,6 +5,16 @@ This package implements the Circuit Relay v2 protocol as specified in:
https://github.com/libp2p/specs/blob/master/relay/circuit-v2.md
"""
from .dcutr import (
DCUtRProtocol,
)
from .dcutr import PROTOCOL_ID as DCUTR_PROTOCOL_ID
from .nat import (
ReachabilityChecker,
is_private_ip,
)
from .discovery import (
RelayDiscovery,
)
@ -29,4 +39,8 @@ __all__ = [
"RelayResourceManager",
"CircuitV2Transport",
"RelayDiscovery",
"DCUtRProtocol",
"DCUTR_PROTOCOL_ID",
"ReachabilityChecker",
"is_private_ip",
]

580
libp2p/relay/circuit_v2/dcutr.py Normal file
View File

@ -0,0 +1,580 @@
"""
Direct Connection Upgrade through Relay (DCUtR) protocol implementation.
This module implements the DCUtR protocol as specified in:
https://github.com/libp2p/specs/blob/master/relay/DCUtR.md
DCUtR enables peers behind NAT to establish direct connections
using hole punching techniques.
"""
import logging
import time
from typing import Any
from multiaddr import Multiaddr
import trio
from libp2p.abc import (
IHost,
INetConn,
INetStream,
)
from libp2p.custom_types import (
TProtocol,
)
from libp2p.peer.id import (
ID,
)
from libp2p.peer.peerinfo import (
PeerInfo,
)
from libp2p.relay.circuit_v2.nat import (
ReachabilityChecker,
)
from libp2p.relay.circuit_v2.pb.dcutr_pb2 import (
HolePunch,
)
from libp2p.tools.async_service import (
Service,
)
logger = logging.getLogger(__name__)
# Protocol ID for DCUtR
PROTOCOL_ID = TProtocol("/libp2p/dcutr")
# Maximum message size for DCUtR (4KiB as per spec)
MAX_MESSAGE_SIZE = 4 * 1024
# Timeouts
STREAM_READ_TIMEOUT = 30 # seconds
STREAM_WRITE_TIMEOUT = 30 # seconds
DIAL_TIMEOUT = 10 # seconds
# Maximum number of hole punch attempts per peer
MAX_HOLE_PUNCH_ATTEMPTS = 5
# Delay between retry attempts
HOLE_PUNCH_RETRY_DELAY = 30 # seconds
# Maximum observed addresses to exchange
MAX_OBSERVED_ADDRS = 20
class DCUtRProtocol(Service):
"""
DCUtRProtocol implements the Direct Connection Upgrade through Relay protocol.
This protocol allows two NATed peers to establish direct connections through
hole punching, after they have established an initial connection through a relay.
"""
def __init__(self, host: IHost):
"""
Initialize the DCUtR protocol.
Parameters
----------
host : IHost
The libp2p host this protocol is running on
"""
super().__init__()
self.host = host
self.event_started = trio.Event()
self._hole_punch_attempts: dict[ID, int] = {}
self._direct_connections: set[ID] = set()
self._in_progress: set[ID] = set()
self._reachability_checker = ReachabilityChecker(host)
self._nursery: trio.Nursery | None = None
async def run(self, *, task_status: Any = trio.TASK_STATUS_IGNORED) -> None:
"""Run the protocol service."""
try:
# Register the DCUtR protocol handler
logger.debug("Registering DCUtR protocol handler")
self.host.set_stream_handler(PROTOCOL_ID, self._handle_dcutr_stream)
# Signal that we're ready
self.event_started.set()
# Start the service
async with trio.open_nursery() as nursery:
self._nursery = nursery
task_status.started()
logger.debug("DCUtR protocol service started")
# Wait for service to be stopped
await self.manager.wait_finished()
finally:
# Clean up
try:
# Use empty async lambda instead of None for stream handler
async def empty_handler(_: INetStream) -> None:
pass
self.host.set_stream_handler(PROTOCOL_ID, empty_handler)
logger.debug("DCUtR protocol handler unregistered")
except Exception as e:
logger.error("Error unregistering DCUtR protocol handler: %s", str(e))
# Clear state
self._hole_punch_attempts.clear()
self._direct_connections.clear()
self._in_progress.clear()
self._nursery = None
async def _handle_dcutr_stream(self, stream: INetStream) -> None:
"""
Handle incoming DCUtR streams.
Parameters
----------
stream : INetStream
The incoming stream
"""
try:
# Get the remote peer ID
remote_peer_id = stream.muxed_conn.peer_id
logger.debug("Received DCUtR stream from peer %s", remote_peer_id)
# Check if we already have a direct connection
if await self._have_direct_connection(remote_peer_id):
logger.debug(
"Already have direct connection to %s, closing stream",
remote_peer_id,
)
await stream.close()
return
# Check if there's already an active hole punch attempt
if remote_peer_id in self._in_progress:
logger.debug("Hole punch already in progress with %s", remote_peer_id)
# Let the existing attempt continue
await stream.close()
return
# Mark as in progress
self._in_progress.add(remote_peer_id)
try:
# Read the CONNECT message
with trio.fail_after(STREAM_READ_TIMEOUT):
msg_bytes = await stream.read(MAX_MESSAGE_SIZE)
# Parse the message
connect_msg = HolePunch()
connect_msg.ParseFromString(msg_bytes)
# Verify it's a CONNECT message
if connect_msg.type != HolePunch.CONNECT:
logger.warning("Expected CONNECT message, got %s", connect_msg.type)
await stream.close()
return
logger.debug(
"Received CONNECT message from %s with %d addresses",
remote_peer_id,
len(connect_msg.ObsAddrs),
)
# Process observed addresses from the peer
peer_addrs = self._decode_observed_addrs(list(connect_msg.ObsAddrs))
logger.debug("Decoded %d valid addresses from peer", len(peer_addrs))
# Store the addresses in the peerstore
if peer_addrs:
self.host.get_peerstore().add_addrs(
remote_peer_id, peer_addrs, 10 * 60
) # 10 minute TTL
# Send our CONNECT message with our observed addresses
our_addrs = await self._get_observed_addrs()
response = HolePunch()
response.type = HolePunch.CONNECT
response.ObsAddrs.extend(our_addrs)
with trio.fail_after(STREAM_WRITE_TIMEOUT):
await stream.write(response.SerializeToString())
logger.debug(
"Sent CONNECT response to %s with %d addresses",
remote_peer_id,
len(our_addrs),
)
# Wait for SYNC message
with trio.fail_after(STREAM_READ_TIMEOUT):
sync_bytes = await stream.read(MAX_MESSAGE_SIZE)
# Parse the SYNC message
sync_msg = HolePunch()
sync_msg.ParseFromString(sync_bytes)
# Verify it's a SYNC message
if sync_msg.type != HolePunch.SYNC:
logger.warning("Expected SYNC message, got %s", sync_msg.type)
await stream.close()
return
logger.debug("Received SYNC message from %s", remote_peer_id)
# Perform hole punch
success = await self._perform_hole_punch(remote_peer_id, peer_addrs)
if success:
logger.info(
"Successfully established direct connection with %s",
remote_peer_id,
)
else:
logger.warning(
"Failed to establish direct connection with %s", remote_peer_id
)
except trio.TooSlowError:
logger.warning("Timeout in DCUtR protocol with peer %s", remote_peer_id)
except Exception as e:
logger.error(
"Error in DCUtR protocol with peer %s: %s", remote_peer_id, str(e)
)
finally:
# Clean up
self._in_progress.discard(remote_peer_id)
await stream.close()
except Exception as e:
logger.error("Error handling DCUtR stream: %s", str(e))
await stream.close()
async def initiate_hole_punch(self, peer_id: ID) -> bool:
"""
Initiate a hole punch with a peer.
Parameters
----------
peer_id : ID
The peer to hole punch with
Returns
-------
bool
True if hole punch was successful, False otherwise
"""
# Check if we already have a direct connection
if await self._have_direct_connection(peer_id):
logger.debug("Already have direct connection to %s", peer_id)
return True
# Check if there's already an active hole punch attempt
if peer_id in self._in_progress:
logger.debug("Hole punch already in progress with %s", peer_id)
return False
# Check if we've exceeded the maximum number of attempts
attempts = self._hole_punch_attempts.get(peer_id, 0)
if attempts >= MAX_HOLE_PUNCH_ATTEMPTS:
logger.warning("Maximum hole punch attempts reached for peer %s", peer_id)
return False
# Mark as in progress and increment attempt counter
self._in_progress.add(peer_id)
self._hole_punch_attempts[peer_id] = attempts + 1
try:
# Open a DCUtR stream to the peer
logger.debug("Opening DCUtR stream to peer %s", peer_id)
stream = await self.host.new_stream(peer_id, [PROTOCOL_ID])
if not stream:
logger.warning("Failed to open DCUtR stream to peer %s", peer_id)
return False
try:
# Send our CONNECT message with our observed addresses
our_addrs = await self._get_observed_addrs()
connect_msg = HolePunch()
connect_msg.type = HolePunch.CONNECT
connect_msg.ObsAddrs.extend(our_addrs)
start_time = time.time()
with trio.fail_after(STREAM_WRITE_TIMEOUT):
await stream.write(connect_msg.SerializeToString())
logger.debug(
"Sent CONNECT message to %s with %d addresses",
peer_id,
len(our_addrs),
)
# Receive the peer's CONNECT message
with trio.fail_after(STREAM_READ_TIMEOUT):
resp_bytes = await stream.read(MAX_MESSAGE_SIZE)
# Calculate RTT
rtt = time.time() - start_time
# Parse the response
resp = HolePunch()
resp.ParseFromString(resp_bytes)
# Verify it's a CONNECT message
if resp.type != HolePunch.CONNECT:
logger.warning("Expected CONNECT message, got %s", resp.type)
return False
logger.debug(
"Received CONNECT response from %s with %d addresses",
peer_id,
len(resp.ObsAddrs),
)
# Process observed addresses from the peer
peer_addrs = self._decode_observed_addrs(list(resp.ObsAddrs))
logger.debug("Decoded %d valid addresses from peer", len(peer_addrs))
# Store the addresses in the peerstore
if peer_addrs:
self.host.get_peerstore().add_addrs(
peer_id, peer_addrs, 10 * 60
) # 10 minute TTL
# Send SYNC message with timing information
# We'll use a future time that's 2*RTT from now to ensure both sides
# are ready
punch_time = time.time() + (2 * rtt) + 1 # Add 1 second buffer
sync_msg = HolePunch()
sync_msg.type = HolePunch.SYNC
with trio.fail_after(STREAM_WRITE_TIMEOUT):
await stream.write(sync_msg.SerializeToString())
logger.debug("Sent SYNC message to %s", peer_id)
# Perform the synchronized hole punch
success = await self._perform_hole_punch(
peer_id, peer_addrs, punch_time
)
if success:
logger.info(
"Successfully established direct connection with %s", peer_id
)
return True
else:
logger.warning(
"Failed to establish direct connection with %s", peer_id
)
return False
except trio.TooSlowError:
logger.warning("Timeout in DCUtR protocol with peer %s", peer_id)
return False
except Exception as e:
logger.error(
"Error in DCUtR protocol with peer %s: %s", peer_id, str(e)
)
return False
finally:
await stream.close()
except Exception as e:
logger.error(
"Error initiating hole punch with peer %s: %s", peer_id, str(e)
)
return False
finally:
self._in_progress.discard(peer_id)
# This should never be reached, but add explicit return for type checking
return False
async def _perform_hole_punch(
self, peer_id: ID, addrs: list[Multiaddr], punch_time: float | None = None
) -> bool:
"""
Perform a hole punch attempt with a peer.
Parameters
----------
peer_id : ID
The peer to hole punch with
addrs : list[Multiaddr]
List of addresses to try
punch_time : Optional[float]
Time to perform the punch (if None, do it immediately)
Returns
-------
bool
True if hole punch was successful
"""
if not addrs:
logger.warning("No addresses to try for hole punch with %s", peer_id)
return False
# If punch_time is specified, wait until that time
if punch_time is not None:
now = time.time()
if punch_time > now:
wait_time = punch_time - now
logger.debug("Waiting %.2f seconds before hole punch", wait_time)
await trio.sleep(wait_time)
# Try to dial each address
logger.debug(
"Starting hole punch with peer %s using %d addresses", peer_id, len(addrs)
)
# Filter to only include non-relay addresses
direct_addrs = [
addr for addr in addrs if not str(addr).startswith("/p2p-circuit")
]
if not direct_addrs:
logger.warning("No direct addresses found for peer %s", peer_id)
return False
# Start dialing attempts in parallel
async with trio.open_nursery() as nursery:
for addr in direct_addrs[
:5
]: # Limit to 5 addresses to avoid too many connections
nursery.start_soon(self._dial_peer, peer_id, addr)
# Check if we established a direct connection
return await self._have_direct_connection(peer_id)
async def _dial_peer(self, peer_id: ID, addr: Multiaddr) -> None:
"""
Attempt to dial a peer at a specific address.
Parameters
----------
peer_id : ID
The peer to dial
addr : Multiaddr
The address to dial
"""
try:
logger.debug("Attempting to dial %s at %s", peer_id, addr)
# Create peer info
peer_info = PeerInfo(peer_id, [addr])
# Try to connect with timeout
with trio.fail_after(DIAL_TIMEOUT):
await self.host.connect(peer_info)
logger.info("Successfully connected to %s at %s", peer_id, addr)
# Add to direct connections set
self._direct_connections.add(peer_id)
except trio.TooSlowError:
logger.debug("Timeout dialing %s at %s", peer_id, addr)
except Exception as e:
logger.debug("Error dialing %s at %s: %s", peer_id, addr, str(e))
async def _have_direct_connection(self, peer_id: ID) -> bool:
"""
Check if we already have a direct connection to a peer.
Parameters
----------
peer_id : ID
The peer to check
Returns
-------
bool
True if we have a direct connection, False otherwise
"""
# Check our direct connections cache first
if peer_id in self._direct_connections:
return True
# Check if the peer is connected
network = self.host.get_network()
conn_or_conns = network.connections.get(peer_id)
if not conn_or_conns:
return False
# Handle both single connection and list of connections
connections: list[INetConn] = (
[conn_or_conns] if not isinstance(conn_or_conns, list) else conn_or_conns
)
# Check if any connection is direct (not relayed)
for conn in connections:
# Get the transport addresses
addrs = conn.get_transport_addresses()
# If any address doesn't start with /p2p-circuit, it's a direct connection
if any(not str(addr).startswith("/p2p-circuit") for addr in addrs):
# Cache this result
self._direct_connections.add(peer_id)
return True
return False
async def _get_observed_addrs(self) -> list[bytes]:
"""
Get our observed addresses to share with the peer.
Returns
-------
List[bytes]
List of observed addresses as bytes
"""
# Get all listen addresses
addrs = self.host.get_addrs()
# Filter out relay addresses
direct_addrs = [
addr for addr in addrs if not str(addr).startswith("/p2p-circuit")
]
# Limit the number of addresses
if len(direct_addrs) > MAX_OBSERVED_ADDRS:
direct_addrs = direct_addrs[:MAX_OBSERVED_ADDRS]
# Convert to bytes
addr_bytes = [addr.to_bytes() for addr in direct_addrs]
return addr_bytes
def _decode_observed_addrs(self, addr_bytes: list[bytes]) -> list[Multiaddr]:
"""
Decode observed addresses received from a peer.
Parameters
----------
addr_bytes : List[bytes]
The encoded addresses
Returns
-------
List[Multiaddr]
The decoded multiaddresses
"""
result = []
for addr_byte in addr_bytes:
try:
addr = Multiaddr(addr_byte)
# Validate the address (basic check)
if str(addr).startswith("/ip"):
result.append(addr)
except Exception as e:
logger.debug("Error decoding multiaddr: %s", str(e))
return result

300
libp2p/relay/circuit_v2/nat.py Normal file
View File

@ -0,0 +1,300 @@
"""
NAT traversal utilities for libp2p.
This module provides utilities for NAT traversal and reachability detection.
"""
import ipaddress
import logging
from multiaddr import (
Multiaddr,
)
from libp2p.abc import (
IHost,
INetConn,
)
from libp2p.peer.id import (
ID,
)
logger = logging.getLogger("libp2p.relay.circuit_v2.nat")
# Timeout for reachability checks
REACHABILITY_TIMEOUT = 10 # seconds
# Define private IP ranges
PRIVATE_IP_RANGES = [
("10.0.0.0", "10.255.255.255"), # Class A private network: 10.0.0.0/8
("172.16.0.0", "172.31.255.255"), # Class B private network: 172.16.0.0/12
("192.168.0.0", "192.168.255.255"), # Class C private network: 192.168.0.0/16
]
# Link-local address range: 169.254.0.0/16
LINK_LOCAL_RANGE = ("169.254.0.0", "169.254.255.255")
# Loopback address range: 127.0.0.0/8
LOOPBACK_RANGE = ("127.0.0.0", "127.255.255.255")
def ip_to_int(ip: str) -> int:
"""
Convert an IP address to an integer.
Parameters
----------
ip : str
IP address to convert
Returns
-------
int
Integer representation of the IP
"""
try:
return int(ipaddress.IPv4Address(ip))
except ipaddress.AddressValueError:
# Handle IPv6 addresses
return int(ipaddress.IPv6Address(ip))
def is_ip_in_range(ip: str, start_range: str, end_range: str) -> bool:
"""
Check if an IP address is within a range.
Parameters
----------
ip : str
IP address to check
start_range : str
Start of the range
end_range : str
End of the range
Returns
-------
bool
True if the IP is in the range
"""
try:
ip_int = ip_to_int(ip)
start_int = ip_to_int(start_range)
end_int = ip_to_int(end_range)
return start_int <= ip_int <= end_int
except Exception:
return False
def is_private_ip(ip: str) -> bool:
"""
Check if an IP address is private.
Parameters
----------
ip : str
IP address to check
Returns
-------
bool
True if IP is private
"""
for start_range, end_range in PRIVATE_IP_RANGES:
if is_ip_in_range(ip, start_range, end_range):
return True
# Check for link-local addresses
if is_ip_in_range(ip, *LINK_LOCAL_RANGE):
return True
# Check for loopback addresses
if is_ip_in_range(ip, *LOOPBACK_RANGE):
return True
return False
def extract_ip_from_multiaddr(addr: Multiaddr) -> str | None:
"""
Extract the IP address from a multiaddr.
Parameters
----------
addr : Multiaddr
Multiaddr to extract from
Returns
-------
Optional[str]
IP address or None if not found
"""
# Convert to string representation
addr_str = str(addr)
# Look for IPv4 address
ipv4_start = addr_str.find("/ip4/")
if ipv4_start != -1:
# Extract the IPv4 address
ipv4_end = addr_str.find("/", ipv4_start + 5)
if ipv4_end != -1:
return addr_str[ipv4_start + 5 : ipv4_end]
# Look for IPv6 address
ipv6_start = addr_str.find("/ip6/")
if ipv6_start != -1:
# Extract the IPv6 address
ipv6_end = addr_str.find("/", ipv6_start + 5)
if ipv6_end != -1:
return addr_str[ipv6_start + 5 : ipv6_end]
return None
class ReachabilityChecker:
"""
Utility class for checking peer reachability.
This class assesses whether a peer's addresses are likely
to be directly reachable or behind NAT.
"""
def __init__(self, host: IHost):
"""
Initialize the reachability checker.
Parameters
----------
host : IHost
The libp2p host
"""
self.host = host
self._peer_reachability: dict[ID, bool] = {}
self._known_public_peers: set[ID] = set()
def is_addr_public(self, addr: Multiaddr) -> bool:
"""
Check if an address is likely to be publicly reachable.
Parameters
----------
addr : Multiaddr
The multiaddr to check
Returns
-------
bool
True if address is likely public
"""
# Extract the IP address
ip = extract_ip_from_multiaddr(addr)
if not ip:
return False
# Check if it's a private IP
return not is_private_ip(ip)
def get_public_addrs(self, addrs: list[Multiaddr]) -> list[Multiaddr]:
"""
Filter a list of addresses to only include likely public ones.
Parameters
----------
addrs : List[Multiaddr]
List of addresses to filter
Returns
-------
List[Multiaddr]
List of likely public addresses
"""
return [addr for addr in addrs if self.is_addr_public(addr)]
async def check_peer_reachability(self, peer_id: ID) -> bool:
"""
Check if a peer is directly reachable.
Parameters
----------
peer_id : ID
The peer ID to check
Returns
-------
bool
True if peer is likely directly reachable
"""
# Check if we already know
if peer_id in self._peer_reachability:
return self._peer_reachability[peer_id]
# Check if the peer is connected
network = self.host.get_network()
connections: INetConn | list[INetConn] | None = network.connections.get(peer_id)
if not connections:
# Not connected, can't determine reachability
return False
# Check if any connection is direct (not relayed)
if isinstance(connections, list):
for conn in connections:
# Get the transport addresses
addrs = conn.get_transport_addresses()
# If any address doesn't start with /p2p-circuit,
# it's a direct connection
if any(not str(addr).startswith("/p2p-circuit") for addr in addrs):
self._peer_reachability[peer_id] = True
return True
else:
# Handle single connection case
addrs = connections.get_transport_addresses()
if any(not str(addr).startswith("/p2p-circuit") for addr in addrs):
self._peer_reachability[peer_id] = True
return True
# Get the peer's addresses from peerstore
try:
addrs = self.host.get_peerstore().addrs(peer_id)
# Check if peer has any public addresses
public_addrs = self.get_public_addrs(addrs)
if public_addrs:
self._peer_reachability[peer_id] = True
return True
except Exception as e:
logger.debug("Error getting peer addresses: %s", str(e))
# Default to not directly reachable
self._peer_reachability[peer_id] = False
return False
async def check_self_reachability(self) -> tuple[bool, list[Multiaddr]]:
"""
Check if this host is likely directly reachable.
Returns
-------
Tuple[bool, List[Multiaddr]]
Tuple of (is_reachable, public_addresses)
"""
# Get all host addresses
addrs = self.host.get_addrs()
# Filter for public addresses
public_addrs = self.get_public_addrs(addrs)
# If we have public addresses, assume we're reachable
# This is a simplified assumption - real reachability would need
# external checking
is_reachable = len(public_addrs) > 0
return is_reachable, public_addrs

7
libp2p/relay/circuit_v2/pb/__init__.py
View File

@ -5,6 +5,11 @@ Contains generated protobuf code for circuit_v2 relay protocol.
"""
# Import the classes to be accessible directly from the package
from .dcutr_pb2 import (
HolePunch,
)
from .circuit_pb2 import (
HopMessage,
Limit,
@ -13,4 +18,4 @@ from .circuit_pb2 import (
StopMessage,
)
__all__ = ["HopMessage", "Limit", "Reservation", "Status", "StopMessage"]
__all__ = ["HopMessage", "Limit", "Reservation", "Status", "StopMessage", "HolePunch"]

14
libp2p/relay/circuit_v2/pb/dcutr.proto Normal file
View File

@ -0,0 +1,14 @@
syntax = "proto2";
package holepunch.pb;
message HolePunch {
enum Type {
CONNECT = 100;
SYNC = 300;
}
required Type type = 1;
repeated bytes ObsAddrs = 2;
}

26
libp2p/relay/circuit_v2/pb/dcutr_pb2.py Normal file
View File

@ -0,0 +1,26 @@
# -*- coding: utf-8 -*-
# Generated by the protocol buffer compiler. DO NOT EDIT!
# source: libp2p/relay/circuit_v2/pb/dcutr.proto
"""Generated protocol buffer code."""
from google.protobuf.internal import builder as _builder
from google.protobuf import descriptor as _descriptor
from google.protobuf import descriptor_pool as _descriptor_pool
from google.protobuf import symbol_database as _symbol_database
# @@protoc_insertion_point(imports)
_sym_db = _symbol_database.Default()
DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n&libp2p/relay/circuit_v2/pb/dcutr.proto\x12\x0cholepunch.pb\"\x69\n\tHolePunch\x12*\n\x04type\x18\x01 \x02(\x0e\x32\x1c.holepunch.pb.HolePunch.Type\x12\x10\n\x08ObsAddrs\x18\x02 \x03(\x0c\"\x1e\n\x04Type\x12\x0b\n\x07CONNECT\x10\x64\x12\t\n\x04SYNC\x10\xac\x02')
_builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, globals())
_builder.BuildTopDescriptorsAndMessages(DESCRIPTOR, 'libp2p.relay.circuit_v2.pb.dcutr_pb2', globals())
if _descriptor._USE_C_DESCRIPTORS == False:
DESCRIPTOR._options = None
_HOLEPUNCH._serialized_start=56
_HOLEPUNCH._serialized_end=161
_HOLEPUNCH_TYPE._serialized_start=131
_HOLEPUNCH_TYPE._serialized_end=161
# @@protoc_insertion_point(module_scope)

54
libp2p/relay/circuit_v2/pb/dcutr_pb2.pyi Normal file
View File

@ -0,0 +1,54 @@
"""
@generated by mypy-protobuf. Do not edit manually!
isort:skip_file
"""
import builtins
import collections.abc
import google.protobuf.descriptor
import google.protobuf.internal.containers
import google.protobuf.message
import typing
DESCRIPTOR: google.protobuf.descriptor.FileDescriptor
@typing.final
class HolePunch(google.protobuf.message.Message):
"""HolePunch message for the DCUtR protocol."""
DESCRIPTOR: google.protobuf.descriptor.Descriptor
class Type(builtins.int):
"""Message types for HolePunch"""
@builtins.classmethod
def Name(cls, number: builtins.int) -> builtins.str: ...
@builtins.classmethod
def Value(cls, name: builtins.str) -> 'HolePunch.Type': ...
@builtins.classmethod
def keys(cls) -> typing.List[builtins.str]: ...
@builtins.classmethod
def values(cls) -> typing.List['HolePunch.Type']: ...
@builtins.classmethod
def items(cls) -> typing.List[typing.Tuple[builtins.str, 'HolePunch.Type']]: ...
CONNECT: HolePunch.Type # 100
SYNC: HolePunch.Type # 300
TYPE_FIELD_NUMBER: builtins.int
OBSADDRS_FIELD_NUMBER: builtins.int
type: HolePunch.Type
@property
def ObsAddrs(self) -> google.protobuf.internal.containers.RepeatedScalarFieldContainer[builtins.bytes]: ...
def __init__(
self,
*,
type: HolePunch.Type = ...,
ObsAddrs: collections.abc.Iterable[builtins.bytes] = ...,
) -> None: ...
def HasField(self, field_name: typing.Literal["type", b"type"]) -> builtins.bool: ...
def ClearField(self, field_name: typing.Literal["ObsAddrs", b"ObsAddrs", "type", b"type"]) -> None: ...
global___HolePunch = HolePunch

563
tests/core/relay/test_dcutr_integration.py Normal file
View File

@ -0,0 +1,563 @@
"""Integration tests for DCUtR protocol with real libp2p hosts using circuit relay."""
import logging
from unittest.mock import AsyncMock, MagicMock
import pytest
from multiaddr import Multiaddr
import trio
from libp2p.relay.circuit_v2.dcutr import (
MAX_HOLE_PUNCH_ATTEMPTS,
PROTOCOL_ID,
DCUtRProtocol,
)
from libp2p.relay.circuit_v2.pb.dcutr_pb2 import (
HolePunch,
)
from libp2p.relay.circuit_v2.protocol import (
DEFAULT_RELAY_LIMITS,
CircuitV2Protocol,
)
from libp2p.tools.async_service import (
background_trio_service,
)
from tests.utils.factories import (
HostFactory,
)
logger = logging.getLogger(__name__)
# Test timeouts
SLEEP_TIME = 0.5 # seconds
@pytest.mark.trio
async def test_dcutr_through_relay_connection():
"""
Test DCUtR protocol where peers are connected via relay,
then upgrade to direct.
"""
# Create three hosts: two peers and one relay
async with HostFactory.create_batch_and_listen(3) as hosts:
peer1, peer2, relay = hosts
# Create circuit relay protocol for the relay
relay_protocol = CircuitV2Protocol(relay, DEFAULT_RELAY_LIMITS, allow_hop=True)
# Create DCUtR protocols for both peers
dcutr1 = DCUtRProtocol(peer1)
dcutr2 = DCUtRProtocol(peer2)
# Track if DCUtR stream handlers were called
handler1_called = False
handler2_called = False
# Override stream handlers to track calls
original_handler1 = dcutr1._handle_dcutr_stream
original_handler2 = dcutr2._handle_dcutr_stream
async def tracked_handler1(stream):
nonlocal handler1_called
handler1_called = True
await original_handler1(stream)
async def tracked_handler2(stream):
nonlocal handler2_called
handler2_called = True
await original_handler2(stream)
dcutr1._handle_dcutr_stream = tracked_handler1
dcutr2._handle_dcutr_stream = tracked_handler2
# Start all protocols
async with background_trio_service(relay_protocol):
async with background_trio_service(dcutr1):
async with background_trio_service(dcutr2):
await relay_protocol.event_started.wait()
await dcutr1.event_started.wait()
await dcutr2.event_started.wait()
# Connect both peers to the relay
relay_addrs = relay.get_addrs()
# Add relay addresses to both peers' peerstores
for addr in relay_addrs:
peer1.get_peerstore().add_addrs(relay.get_id(), [addr], 3600)
peer2.get_peerstore().add_addrs(relay.get_id(), [addr], 3600)
# Connect peers to relay
await peer1.connect(relay.get_peerstore().peer_info(relay.get_id()))
await peer2.connect(relay.get_peerstore().peer_info(relay.get_id()))
await trio.sleep(0.1)
# Verify peers are connected to relay
assert relay.get_id() in [
peer_id for peer_id in peer1.get_network().connections.keys()
]
assert relay.get_id() in [
peer_id for peer_id in peer2.get_network().connections.keys()
]
# Verify peers are NOT directly connected to each other
assert peer2.get_id() not in [
peer_id for peer_id in peer1.get_network().connections.keys()
]
assert peer1.get_id() not in [
peer_id for peer_id in peer2.get_network().connections.keys()
]
# Now test DCUtR: peer1 opens a DCUtR stream to peer2 through the
# relay
# This should trigger the DCUtR protocol for hole punching
try:
# Create a circuit relay multiaddr for peer2 through the relay
relay_addr = relay_addrs[0]
circuit_addr = Multiaddr(
f"{relay_addr}/p2p-circuit/p2p/{peer2.get_id()}"
)
# Add the circuit address to peer1's peerstore
peer1.get_peerstore().add_addrs(
peer2.get_id(), [circuit_addr], 3600
)
# Open a DCUtR stream from peer1 to peer2 through the relay
stream = await peer1.new_stream(peer2.get_id(), [PROTOCOL_ID])
# Send a CONNECT message with observed addresses
peer1_addrs = peer1.get_addrs()
connect_msg = HolePunch(
type=HolePunch.CONNECT,
ObsAddrs=[addr.to_bytes() for addr in peer1_addrs[:2]],
)
await stream.write(connect_msg.SerializeToString())
# Wait for the message to be processed
await trio.sleep(0.2)
# Verify that the DCUtR stream handler was called on peer2
assert handler2_called, (
"DCUtR stream handler should have been called on peer2"
)
# Close the stream
await stream.close()
except Exception as e:
logger.info(
"Expected error when trying to open DCUtR stream through "
"relay: %s",
e,
)
# This might fail because we need more setup, but the important
# thing is testing the right scenario
# Wait a bit more
await trio.sleep(0.1)
@pytest.mark.trio
async def test_dcutr_relay_to_direct_upgrade():
"""Test the complete flow: relay connection -> DCUtR -> direct connection."""
# Create three hosts: two peers and one relay
async with HostFactory.create_batch_and_listen(3) as hosts:
peer1, peer2, relay = hosts
# Create circuit relay protocol for the relay
relay_protocol = CircuitV2Protocol(relay, DEFAULT_RELAY_LIMITS, allow_hop=True)
# Create DCUtR protocols for both peers
dcutr1 = DCUtRProtocol(peer1)
dcutr2 = DCUtRProtocol(peer2)
# Track messages received
messages_received = []
# Override stream handler to capture messages
original_handler = dcutr2._handle_dcutr_stream
async def message_capturing_handler(stream):
try:
# Read the message
msg_data = await stream.read()
hole_punch = HolePunch()
hole_punch.ParseFromString(msg_data)
messages_received.append(hole_punch)
# Send a SYNC response
sync_msg = HolePunch(type=HolePunch.SYNC)
await stream.write(sync_msg.SerializeToString())
await original_handler(stream)
except Exception as e:
logger.error(f"Error in message capturing handler: {e}")
await stream.close()
dcutr2._handle_dcutr_stream = message_capturing_handler
# Start all protocols
async with background_trio_service(relay_protocol):
async with background_trio_service(dcutr1):
async with background_trio_service(dcutr2):
await relay_protocol.event_started.wait()
await dcutr1.event_started.wait()
await dcutr2.event_started.wait()
# Re-register the handler with the host
dcutr2.host.set_stream_handler(
PROTOCOL_ID, message_capturing_handler
)
# Connect both peers to the relay
relay_addrs = relay.get_addrs()
# Add relay addresses to both peers' peerstores
for addr in relay_addrs:
peer1.get_peerstore().add_addrs(relay.get_id(), [addr], 3600)
peer2.get_peerstore().add_addrs(relay.get_id(), [addr], 3600)
# Connect peers to relay
await peer1.connect(relay.get_peerstore().peer_info(relay.get_id()))
await peer2.connect(relay.get_peerstore().peer_info(relay.get_id()))
await trio.sleep(0.1)
# Verify peers are connected to relay but not to each other
assert relay.get_id() in [
peer_id for peer_id in peer1.get_network().connections.keys()
]
assert relay.get_id() in [
peer_id for peer_id in peer2.get_network().connections.keys()
]
assert peer2.get_id() not in [
peer_id for peer_id in peer1.get_network().connections.keys()
]
# Try to open a DCUtR stream through the relay
try:
# Create a circuit relay multiaddr for peer2 through the relay
relay_addr = relay_addrs[0]
circuit_addr = Multiaddr(
f"{relay_addr}/p2p-circuit/p2p/{peer2.get_id()}"
)
# Add the circuit address to peer1's peerstore
peer1.get_peerstore().add_addrs(
peer2.get_id(), [circuit_addr], 3600
)
# Open a DCUtR stream from peer1 to peer2 through the relay
stream = await peer1.new_stream(peer2.get_id(), [PROTOCOL_ID])
# Send a CONNECT message with observed addresses
peer1_addrs = peer1.get_addrs()
connect_msg = HolePunch(
type=HolePunch.CONNECT,
ObsAddrs=[addr.to_bytes() for addr in peer1_addrs[:2]],
)
await stream.write(connect_msg.SerializeToString())
# Wait for the message to be processed
await trio.sleep(0.2)
# Verify that the CONNECT message was received
assert len(messages_received) == 1, (
"Should have received one message"
)
assert messages_received[0].type == HolePunch.CONNECT, (
"Should have received CONNECT message"
)
assert len(messages_received[0].ObsAddrs) == 2, (
"Should have received 2 observed addresses"
)
# Close the stream
await stream.close()
except Exception as e:
logger.info(
"Expected error when trying to open DCUtR stream through "
"relay: %s",
e,
)
# Wait a bit more
await trio.sleep(0.1)
@pytest.mark.trio
async def test_dcutr_hole_punch_through_relay():
"""Test hole punching when peers are connected through relay."""
# Create three hosts: two peers and one relay
async with HostFactory.create_batch_and_listen(3) as hosts:
peer1, peer2, relay = hosts
# Create circuit relay protocol for the relay
relay_protocol = CircuitV2Protocol(relay, DEFAULT_RELAY_LIMITS, allow_hop=True)
# Create DCUtR protocols for both peers
dcutr1 = DCUtRProtocol(peer1)
dcutr2 = DCUtRProtocol(peer2)
# Start all protocols
async with background_trio_service(relay_protocol):
async with background_trio_service(dcutr1):
async with background_trio_service(dcutr2):
await relay_protocol.event_started.wait()
await dcutr1.event_started.wait()
await dcutr2.event_started.wait()
# Connect both peers to the relay
relay_addrs = relay.get_addrs()
# Add relay addresses to both peers' peerstores
for addr in relay_addrs:
peer1.get_peerstore().add_addrs(relay.get_id(), [addr], 3600)
peer2.get_peerstore().add_addrs(relay.get_id(), [addr], 3600)
# Connect peers to relay
await peer1.connect(relay.get_peerstore().peer_info(relay.get_id()))
await peer2.connect(relay.get_peerstore().peer_info(relay.get_id()))
await trio.sleep(0.1)
# Verify peers are connected to relay but not to each other
assert relay.get_id() in [
peer_id for peer_id in peer1.get_network().connections.keys()
]
assert relay.get_id() in [
peer_id for peer_id in peer2.get_network().connections.keys()
]
assert peer2.get_id() not in [
peer_id for peer_id in peer1.get_network().connections.keys()
]
# Check if there's already a direct connection (should be False)
has_direct = await dcutr1._have_direct_connection(peer2.get_id())
assert not has_direct, "Peers should not have a direct connection"
# Try to initiate a hole punch (this should work through the relay
# connection)
# In a real scenario, this would be called after establishing a
# relay connection
result = await dcutr1.initiate_hole_punch(peer2.get_id())
# This should attempt hole punching but likely fail due to no public
# addresses
# The important thing is that the DCUtR protocol logic is executed
logger.info(
"Hole punch result: %s",
result,
)
assert result is not None, "Hole punch result should not be None"
assert isinstance(result, bool), (
"Hole punch result should be a boolean"
)
# Wait a bit more
await trio.sleep(0.1)
@pytest.mark.trio
async def test_dcutr_relay_connection_verification():
"""Test that DCUtR works correctly when peers are connected via relay."""
# Create three hosts: two peers and one relay
async with HostFactory.create_batch_and_listen(3) as hosts:
peer1, peer2, relay = hosts
# Create circuit relay protocol for the relay
relay_protocol = CircuitV2Protocol(relay, DEFAULT_RELAY_LIMITS, allow_hop=True)
# Create DCUtR protocols for both peers
dcutr1 = DCUtRProtocol(peer1)
dcutr2 = DCUtRProtocol(peer2)
# Start all protocols
async with background_trio_service(relay_protocol):
async with background_trio_service(dcutr1):
async with background_trio_service(dcutr2):
await relay_protocol.event_started.wait()
await dcutr1.event_started.wait()
await dcutr2.event_started.wait()
# Connect both peers to the relay
relay_addrs = relay.get_addrs()
# Add relay addresses to both peers' peerstores
for addr in relay_addrs:
peer1.get_peerstore().add_addrs(relay.get_id(), [addr], 3600)
peer2.get_peerstore().add_addrs(relay.get_id(), [addr], 3600)
# Connect peers to relay
await peer1.connect(relay.get_peerstore().peer_info(relay.get_id()))
await peer2.connect(relay.get_peerstore().peer_info(relay.get_id()))
await trio.sleep(0.1)
# Verify peers are connected to relay
assert relay.get_id() in [
peer_id for peer_id in peer1.get_network().connections.keys()
]
assert relay.get_id() in [
peer_id for peer_id in peer2.get_network().connections.keys()
]
# Verify peers are NOT directly connected to each other
assert peer2.get_id() not in [
peer_id for peer_id in peer1.get_network().connections.keys()
]
assert peer1.get_id() not in [
peer_id for peer_id in peer2.get_network().connections.keys()
]
# Test getting observed addresses (real implementation)
observed_addrs1 = await dcutr1._get_observed_addrs()
observed_addrs2 = await dcutr2._get_observed_addrs()
assert isinstance(observed_addrs1, list)
assert isinstance(observed_addrs2, list)
# Should contain the hosts' actual addresses
assert len(observed_addrs1) > 0, (
"Peer1 should have observed addresses"
)
assert len(observed_addrs2) > 0, (
"Peer2 should have observed addresses"
)
# Test decoding observed addresses
test_addrs = [
Multiaddr("/ip4/127.0.0.1/tcp/1234").to_bytes(),
Multiaddr("/ip4/192.168.1.1/tcp/5678").to_bytes(),
b"invalid-addr", # This should be filtered out
]
decoded = dcutr1._decode_observed_addrs(test_addrs)
assert len(decoded) == 2, "Should decode 2 valid addresses"
assert all(str(addr).startswith("/ip4/") for addr in decoded)
# Wait a bit more
await trio.sleep(0.1)
@pytest.mark.trio
async def test_dcutr_relay_error_handling():
"""Test DCUtR error handling when working through relay connections."""
# Create three hosts: two peers and one relay
async with HostFactory.create_batch_and_listen(3) as hosts:
peer1, peer2, relay = hosts
# Create circuit relay protocol for the relay
relay_protocol = CircuitV2Protocol(relay, DEFAULT_RELAY_LIMITS, allow_hop=True)
# Create DCUtR protocols for both peers
dcutr1 = DCUtRProtocol(peer1)
dcutr2 = DCUtRProtocol(peer2)
# Start all protocols
async with background_trio_service(relay_protocol):
async with background_trio_service(dcutr1):
async with background_trio_service(dcutr2):
await relay_protocol.event_started.wait()
await dcutr1.event_started.wait()
await dcutr2.event_started.wait()
# Connect both peers to the relay
relay_addrs = relay.get_addrs()
# Add relay addresses to both peers' peerstores
for addr in relay_addrs:
peer1.get_peerstore().add_addrs(relay.get_id(), [addr], 3600)
peer2.get_peerstore().add_addrs(relay.get_id(), [addr], 3600)
# Connect peers to relay
await peer1.connect(relay.get_peerstore().peer_info(relay.get_id()))
await peer2.connect(relay.get_peerstore().peer_info(relay.get_id()))
await trio.sleep(0.1)
# Test with a stream that times out
timeout_stream = MagicMock()
timeout_stream.muxed_conn.peer_id = peer2.get_id()
timeout_stream.read = AsyncMock(side_effect=trio.TooSlowError())
timeout_stream.write = AsyncMock()
timeout_stream.close = AsyncMock()
# This should not raise an exception, just log and close
await dcutr1._handle_dcutr_stream(timeout_stream)
# Verify stream was closed
assert timeout_stream.close.called
# Test with malformed message
malformed_stream = MagicMock()
malformed_stream.muxed_conn.peer_id = peer2.get_id()
malformed_stream.read = AsyncMock(return_value=b"not-a-protobuf")
malformed_stream.write = AsyncMock()
malformed_stream.close = AsyncMock()
# This should not raise an exception, just log and close
await dcutr1._handle_dcutr_stream(malformed_stream)
# Verify stream was closed
assert malformed_stream.close.called
# Wait a bit more
await trio.sleep(0.1)
@pytest.mark.trio
async def test_dcutr_relay_attempt_limiting():
"""Test DCUtR attempt limiting when working through relay connections."""
# Create three hosts: two peers and one relay
async with HostFactory.create_batch_and_listen(3) as hosts:
peer1, peer2, relay = hosts
# Create circuit relay protocol for the relay
relay_protocol = CircuitV2Protocol(relay, DEFAULT_RELAY_LIMITS, allow_hop=True)
# Create DCUtR protocols for both peers
dcutr1 = DCUtRProtocol(peer1)
dcutr2 = DCUtRProtocol(peer2)
# Start all protocols
async with background_trio_service(relay_protocol):
async with background_trio_service(dcutr1):
async with background_trio_service(dcutr2):
await relay_protocol.event_started.wait()
await dcutr1.event_started.wait()
await dcutr2.event_started.wait()
# Connect both peers to the relay
relay_addrs = relay.get_addrs()
# Add relay addresses to both peers' peerstores
for addr in relay_addrs:
peer1.get_peerstore().add_addrs(relay.get_id(), [addr], 3600)
peer2.get_peerstore().add_addrs(relay.get_id(), [addr], 3600)
# Connect peers to relay
await peer1.connect(relay.get_peerstore().peer_info(relay.get_id()))
await peer2.connect(relay.get_peerstore().peer_info(relay.get_id()))
await trio.sleep(0.1)
# Set max attempts reached
dcutr1._hole_punch_attempts[peer2.get_id()] = (
MAX_HOLE_PUNCH_ATTEMPTS
)
# Try to initiate hole punch - should fail due to max attempts
result = await dcutr1.initiate_hole_punch(peer2.get_id())
assert result is False, "Hole punch should fail due to max attempts"
# Reset attempts
dcutr1._hole_punch_attempts.clear()
# Add to direct connections
dcutr1._direct_connections.add(peer2.get_id())
# Try to initiate hole punch - should succeed immediately
result = await dcutr1.initiate_hole_punch(peer2.get_id())
assert result is True, (
"Hole punch should succeed for already connected peers"
)
# Wait a bit more
await trio.sleep(0.1)

208
tests/core/relay/test_dcutr_protocol.py Normal file
View File

@ -0,0 +1,208 @@
"""Unit tests for DCUtR protocol."""
import logging
from unittest.mock import AsyncMock, MagicMock
import pytest
import trio
from libp2p.abc import INetStream
from libp2p.peer.id import ID
from libp2p.relay.circuit_v2.dcutr import (
MAX_HOLE_PUNCH_ATTEMPTS,
DCUtRProtocol,
)
from libp2p.relay.circuit_v2.pb.dcutr_pb2 import HolePunch
from libp2p.tools.async_service import background_trio_service
logger = logging.getLogger(__name__)
@pytest.mark.trio
async def test_dcutr_protocol_initialization():
"""Test DCUtR protocol initialization."""
mock_host = MagicMock()
dcutr = DCUtRProtocol(mock_host)
# Test that the protocol is initialized correctly
assert dcutr.host == mock_host
assert not dcutr.event_started.is_set()
assert dcutr._hole_punch_attempts == {}
assert dcutr._direct_connections == set()
assert dcutr._in_progress == set()
# Test that the protocol can be started
async with background_trio_service(dcutr):
# Wait for the protocol to start
await dcutr.event_started.wait()
# Verify that the stream handler was registered
mock_host.set_stream_handler.assert_called_once()
# Verify that the event is set
assert dcutr.event_started.is_set()
@pytest.mark.trio
async def test_dcutr_message_exchange():
"""Test DCUtR message exchange."""
mock_host = MagicMock()
dcutr = DCUtRProtocol(mock_host)
# Test that the protocol can be started
async with background_trio_service(dcutr):
# Wait for the protocol to start
await dcutr.event_started.wait()
# Test CONNECT message
connect_msg = HolePunch(
type=HolePunch.CONNECT,
ObsAddrs=[b"/ip4/127.0.0.1/tcp/1234", b"/ip4/192.168.1.1/tcp/5678"],
)
# Test SYNC message
sync_msg = HolePunch(type=HolePunch.SYNC)
# Verify message types
assert connect_msg.type == HolePunch.CONNECT
assert sync_msg.type == HolePunch.SYNC
assert len(connect_msg.ObsAddrs) == 2
@pytest.mark.trio
async def test_dcutr_error_handling(monkeypatch):
"""Test DCUtR error handling."""
mock_host = MagicMock()
dcutr = DCUtRProtocol(mock_host)
async with background_trio_service(dcutr):
await dcutr.event_started.wait()
# Simulate a stream that times out
class TimeoutStream(INetStream):
def __init__(self):
self._protocol = None
self.muxed_conn = MagicMock(peer_id=ID(b"peer"))
async def read(self, n: int | None = None) -> bytes:
await trio.sleep(0.2)
raise trio.TooSlowError()
async def write(self, data: bytes) -> None:
return None
async def close(self, *args, **kwargs):
return None
async def reset(self):
return None
def get_protocol(self):
return self._protocol
def set_protocol(self, protocol_id):
self._protocol = protocol_id
def get_remote_address(self):
return ("127.0.0.1", 1234)
# Should not raise, just log and close
await dcutr._handle_dcutr_stream(TimeoutStream())
# Simulate a stream with malformed message
class MalformedStream(INetStream):
def __init__(self):
self._protocol = None
self.muxed_conn = MagicMock(peer_id=ID(b"peer"))
async def read(self, n: int | None = None) -> bytes:
return b"not-a-protobuf"
async def write(self, data: bytes) -> None:
return None
async def close(self, *args, **kwargs):
return None
async def reset(self):
return None
def get_protocol(self):
return self._protocol
def set_protocol(self, protocol_id):
self._protocol = protocol_id
def get_remote_address(self):
return ("127.0.0.1", 1234)
await dcutr._handle_dcutr_stream(MalformedStream())
@pytest.mark.trio
async def test_dcutr_max_attempts_and_already_connected():
"""Test max hole punch attempts and already-connected peer."""
mock_host = MagicMock()
dcutr = DCUtRProtocol(mock_host)
peer_id = ID(b"peer")
# Simulate already having a direct connection
dcutr._direct_connections.add(peer_id)
result = await dcutr.initiate_hole_punch(peer_id)
assert result is True
# Remove direct connection, simulate max attempts
dcutr._direct_connections.clear()
dcutr._hole_punch_attempts[peer_id] = MAX_HOLE_PUNCH_ATTEMPTS
result = await dcutr.initiate_hole_punch(peer_id)
assert result is False
@pytest.mark.trio
async def test_dcutr_observed_addr_encoding_decoding():
"""Test observed address encoding/decoding."""
from multiaddr import Multiaddr
mock_host = MagicMock()
dcutr = DCUtRProtocol(mock_host)
# Simulate valid and invalid multiaddrs as bytes
valid = [
Multiaddr("/ip4/127.0.0.1/tcp/1234").to_bytes(),
Multiaddr("/ip4/192.168.1.1/tcp/5678").to_bytes(),
]
invalid = [b"not-a-multiaddr", b""]
decoded = dcutr._decode_observed_addrs(valid + invalid)
assert len(decoded) == 2
@pytest.mark.trio
async def test_dcutr_real_perform_hole_punch(monkeypatch):
"""Test initiate_hole_punch with real _perform_hole_punch logic (mock network)."""
mock_host = MagicMock()
dcutr = DCUtRProtocol(mock_host)
peer_id = ID(b"peer")
# Patch methods to simulate a successful punch
monkeypatch.setattr(dcutr, "_have_direct_connection", AsyncMock(return_value=False))
monkeypatch.setattr(
dcutr,
"_get_observed_addrs",
AsyncMock(return_value=[b"/ip4/127.0.0.1/tcp/1234"]),
)
mock_stream = MagicMock()
mock_stream.read = AsyncMock(
side_effect=[
HolePunch(
type=HolePunch.CONNECT, ObsAddrs=[b"/ip4/192.168.1.1/tcp/4321"]
).SerializeToString(),
HolePunch(type=HolePunch.SYNC).SerializeToString(),
]
)
mock_stream.write = AsyncMock()
mock_stream.close = AsyncMock()
mock_stream.muxed_conn = MagicMock(peer_id=peer_id)
mock_host.new_stream = AsyncMock(return_value=mock_stream)
monkeypatch.setattr(dcutr, "_perform_hole_punch", AsyncMock(return_value=True))
result = await dcutr.initiate_hole_punch(peer_id)
assert result is True

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tests/core/relay/test_nat.py Normal file
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"""Tests for NAT traversal utilities."""
from unittest.mock import MagicMock
import pytest
from multiaddr import Multiaddr
from libp2p.peer.id import ID
from libp2p.relay.circuit_v2.nat import (
ReachabilityChecker,
extract_ip_from_multiaddr,
ip_to_int,
is_ip_in_range,
is_private_ip,
)
def test_ip_to_int_ipv4():
"""Test converting IPv4 addresses to integers."""
assert ip_to_int("192.168.1.1") == 3232235777
assert ip_to_int("10.0.0.1") == 167772161
assert ip_to_int("127.0.0.1") == 2130706433
def test_ip_to_int_ipv6():
"""Test converting IPv6 addresses to integers."""
# Test with a simple IPv6 address
ipv6_int = ip_to_int("::1")
assert isinstance(ipv6_int, int)
assert ipv6_int > 0
def test_ip_to_int_invalid():
"""Test handling of invalid IP addresses."""
with pytest.raises(ValueError):
ip_to_int("invalid-ip")
def test_is_ip_in_range():
"""Test IP range checking."""
# Test within range
assert is_ip_in_range("192.168.1.5", "192.168.1.1", "192.168.1.10") is True
assert is_ip_in_range("10.0.0.5", "10.0.0.0", "10.0.0.255") is True
# Test outside range
assert is_ip_in_range("192.168.2.5", "192.168.1.1", "192.168.1.10") is False
assert is_ip_in_range("8.8.8.8", "10.0.0.0", "10.0.0.255") is False
def test_is_ip_in_range_invalid():
"""Test IP range checking with invalid inputs."""
assert is_ip_in_range("invalid", "192.168.1.1", "192.168.1.10") is False
assert is_ip_in_range("192.168.1.5", "invalid", "192.168.1.10") is False
def test_is_private_ip():
"""Test private IP detection."""
# Private IPs
assert is_private_ip("192.168.1.1") is True
assert is_private_ip("10.0.0.1") is True
assert is_private_ip("172.16.0.1") is True
assert is_private_ip("127.0.0.1") is True # Loopback
assert is_private_ip("169.254.1.1") is True # Link-local
# Public IPs
assert is_private_ip("8.8.8.8") is False
assert is_private_ip("1.1.1.1") is False
assert is_private_ip("208.67.222.222") is False
def test_extract_ip_from_multiaddr():
"""Test IP extraction from multiaddrs."""
# IPv4 addresses
addr1 = Multiaddr("/ip4/192.168.1.1/tcp/1234")
assert extract_ip_from_multiaddr(addr1) == "192.168.1.1"
addr2 = Multiaddr("/ip4/10.0.0.1/udp/5678")
assert extract_ip_from_multiaddr(addr2) == "10.0.0.1"
# IPv6 addresses
addr3 = Multiaddr("/ip6/::1/tcp/1234")
assert extract_ip_from_multiaddr(addr3) == "::1"
addr4 = Multiaddr("/ip6/2001:db8::1/udp/5678")
assert extract_ip_from_multiaddr(addr4) == "2001:db8::1"
# No IP address
addr5 = Multiaddr("/dns4/example.com/tcp/1234")
assert extract_ip_from_multiaddr(addr5) is None
# Complex multiaddr (without p2p to avoid base58 issues)
addr6 = Multiaddr("/ip4/192.168.1.1/tcp/1234/udp/5678")
assert extract_ip_from_multiaddr(addr6) == "192.168.1.1"
def test_reachability_checker_init():
"""Test ReachabilityChecker initialization."""
mock_host = MagicMock()
checker = ReachabilityChecker(mock_host)
assert checker.host == mock_host
assert checker._peer_reachability == {}
assert checker._known_public_peers == set()
def test_reachability_checker_is_addr_public():
"""Test public address detection."""
mock_host = MagicMock()
checker = ReachabilityChecker(mock_host)
# Public addresses
public_addr1 = Multiaddr("/ip4/8.8.8.8/tcp/1234")
assert checker.is_addr_public(public_addr1) is True
public_addr2 = Multiaddr("/ip4/1.1.1.1/udp/5678")
assert checker.is_addr_public(public_addr2) is True
# Private addresses
private_addr1 = Multiaddr("/ip4/192.168.1.1/tcp/1234")
assert checker.is_addr_public(private_addr1) is False
private_addr2 = Multiaddr("/ip4/10.0.0.1/udp/5678")
assert checker.is_addr_public(private_addr2) is False
private_addr3 = Multiaddr("/ip4/127.0.0.1/tcp/1234")
assert checker.is_addr_public(private_addr3) is False
# No IP address
dns_addr = Multiaddr("/dns4/example.com/tcp/1234")
assert checker.is_addr_public(dns_addr) is False
def test_reachability_checker_get_public_addrs():
"""Test filtering for public addresses."""
mock_host = MagicMock()
checker = ReachabilityChecker(mock_host)
addrs = [
Multiaddr("/ip4/8.8.8.8/tcp/1234"), # Public
Multiaddr("/ip4/192.168.1.1/tcp/1234"), # Private
Multiaddr("/ip4/1.1.1.1/udp/5678"), # Public
Multiaddr("/ip4/10.0.0.1/tcp/1234"), # Private
Multiaddr("/dns4/example.com/tcp/1234"), # DNS
]
public_addrs = checker.get_public_addrs(addrs)
assert len(public_addrs) == 2
assert Multiaddr("/ip4/8.8.8.8/tcp/1234") in public_addrs
assert Multiaddr("/ip4/1.1.1.1/udp/5678") in public_addrs
@pytest.mark.trio
async def test_check_peer_reachability_connected_direct():
"""Test peer reachability when directly connected."""
mock_host = MagicMock()
mock_network = MagicMock()
mock_host.get_network.return_value = mock_network
peer_id = ID(b"test-peer-id")
mock_conn = MagicMock()
mock_conn.get_transport_addresses.return_value = [
Multiaddr("/ip4/192.168.1.1/tcp/1234") # Direct connection
]
mock_network.connections = {peer_id: mock_conn}
checker = ReachabilityChecker(mock_host)
result = await checker.check_peer_reachability(peer_id)
assert result is True
assert checker._peer_reachability[peer_id] is True
@pytest.mark.trio
async def test_check_peer_reachability_connected_relay():
"""Test peer reachability when connected through relay."""
mock_host = MagicMock()
mock_network = MagicMock()
mock_host.get_network.return_value = mock_network
peer_id = ID(b"test-peer-id")
mock_conn = MagicMock()
mock_conn.get_transport_addresses.return_value = [
Multiaddr("/p2p-circuit/ip4/192.168.1.1/tcp/1234") # Relay connection
]
mock_network.connections = {peer_id: mock_conn}
# Mock peerstore with public addresses
mock_peerstore = MagicMock()
mock_peerstore.addrs.return_value = [
Multiaddr("/ip4/8.8.8.8/tcp/1234") # Public address
]
mock_host.get_peerstore.return_value = mock_peerstore
checker = ReachabilityChecker(mock_host)
result = await checker.check_peer_reachability(peer_id)
assert result is True
assert checker._peer_reachability[peer_id] is True
@pytest.mark.trio
async def test_check_peer_reachability_not_connected():
"""Test peer reachability when not connected."""
mock_host = MagicMock()
mock_network = MagicMock()
mock_host.get_network.return_value = mock_network
peer_id = ID(b"test-peer-id")
mock_network.connections = {} # No connections
checker = ReachabilityChecker(mock_host)
result = await checker.check_peer_reachability(peer_id)
assert result is False
# When not connected, the method doesn't add to cache
assert peer_id not in checker._peer_reachability
@pytest.mark.trio
async def test_check_peer_reachability_cached():
"""Test that peer reachability results are cached."""
mock_host = MagicMock()
checker = ReachabilityChecker(mock_host)
peer_id = ID(b"test-peer-id")
checker._peer_reachability[peer_id] = True
result = await checker.check_peer_reachability(peer_id)
assert result is True
# Should not call host methods when cached
mock_host.get_network.assert_not_called()
@pytest.mark.trio
async def test_check_self_reachability_with_public_addrs():
"""Test self reachability when host has public addresses."""
mock_host = MagicMock()
mock_host.get_addrs.return_value = [
Multiaddr("/ip4/8.8.8.8/tcp/1234"), # Public
Multiaddr("/ip4/192.168.1.1/tcp/1234"), # Private
Multiaddr("/ip4/1.1.1.1/udp/5678"), # Public
]
checker = ReachabilityChecker(mock_host)
is_reachable, public_addrs = await checker.check_self_reachability()
assert is_reachable is True
assert len(public_addrs) == 2
assert Multiaddr("/ip4/8.8.8.8/tcp/1234") in public_addrs
assert Multiaddr("/ip4/1.1.1.1/udp/5678") in public_addrs
@pytest.mark.trio
async def test_check_self_reachability_no_public_addrs():
"""Test self reachability when host has no public addresses."""
mock_host = MagicMock()
mock_host.get_addrs.return_value = [
Multiaddr("/ip4/192.168.1.1/tcp/1234"), # Private
Multiaddr("/ip4/10.0.0.1/udp/5678"), # Private
Multiaddr("/ip4/127.0.0.1/tcp/1234"), # Loopback
]
checker = ReachabilityChecker(mock_host)
is_reachable, public_addrs = await checker.check_self_reachability()
assert is_reachable is False
assert len(public_addrs) == 0
@pytest.mark.trio
async def test_check_peer_reachability_multiple_connections():
"""Test peer reachability with multiple connections."""
mock_host = MagicMock()
mock_network = MagicMock()
mock_host.get_network.return_value = mock_network
peer_id = ID(b"test-peer-id")
mock_conn1 = MagicMock()
mock_conn1.get_transport_addresses.return_value = [
Multiaddr("/p2p-circuit/ip4/192.168.1.1/tcp/1234") # Relay
]
mock_conn2 = MagicMock()
mock_conn2.get_transport_addresses.return_value = [
Multiaddr("/ip4/192.168.1.1/tcp/1234") # Direct
]
mock_network.connections = {peer_id: [mock_conn1, mock_conn2]}
checker = ReachabilityChecker(mock_host)
result = await checker.check_peer_reachability(peer_id)
assert result is True
assert checker._peer_reachability[peer_id] is True