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AutoInterface: Drop embedded scope identifier on fe80::

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The code previously dropped scope identifiers expressed as a trailing
"%ifname", which happens on macOS.  On NetBSD and OpenBSD (and likely
FreeBSD, not tested), the scope identifier is embedded.  Drop that
form of identifier as well, because we keep address and ifname
separate, and because the scope identifier must not be part of
computing the hash of the address.

Resolves #240, failure to peer on NetBSD and OpenBSD.
This commit is contained in:
Greg Troxel 2023-02-28 09:47:09 -05:00
parent b381a61be8
commit e273900e87
1 changed files with 12 additions and 4 deletions
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16
RNS/Interfaces/AutoInterface.py
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@ -23,6 +23,7 @@
from .Interface import Interface
import socketserver
import threading
import re
import socket
import struct
import time
@ -53,6 +54,13 @@ class AutoInterface(Interface):
return AutoInterfaceHandler(callback, *args, **keys)
return create_handler
def descope_linklocal(self, link_local_addr):
# Drop scope specifier expressd as %ifname (macOS)
link_local_addr = link_local_addr.split("%")[0]
# Drop embedded scope specifier (NetBSD, OpenBSD)
link_local_addr = re.sub(r"fe80:[0-9a-f]*::","fe80::", link_local_addr)
return link_local_addr
def __init__(self, owner, name, group_id=None, discovery_scope=None, discovery_port=None, data_port=None, allowed_interfaces=None, ignored_interfaces=None, configured_bitrate=None):
import importlib
if importlib.util.find_spec('netifaces') != None:
@ -158,9 +166,9 @@ class AutoInterface(Interface):
for address in addresses[self.netifaces.AF_INET6]:
if "addr" in address:
if address["addr"].startswith("fe80:"):
link_local_addr = address["addr"]
self.link_local_addresses.append(link_local_addr.split("%")[0])
self.adopted_interfaces[ifname] = link_local_addr.split("%")[0]
link_local_addr = self.descope_linklocal(address["addr"])
self.link_local_addresses.append(link_local_addr)
self.adopted_interfaces[ifname] = link_local_addr
self.multicast_echoes[ifname] = time.time()
RNS.log(str(self)+" Selecting link-local address "+str(link_local_addr)+" for interface "+str(ifname), RNS.LOG_EXTREME)
@ -278,7 +286,7 @@ class AutoInterface(Interface):
for address in addresses[self.netifaces.AF_INET6]:
if "addr" in address:
if address["addr"].startswith("fe80:"):
link_local_addr = address["addr"].split("%")[0]
link_local_addr = self.descope_linklocal(address["addr"])
if link_local_addr != self.adopted_interfaces[ifname]:
old_link_local_address = self.adopted_interfaces[ifname]
RNS.log("Replacing link-local address "+str(old_link_local_address)+" for "+str(ifname)+" with "+str(link_local_addr), RNS.LOG_DEBUG)