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use linklocal on NICs without routable IPs

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ed 2022-12-09 19:11:26 +00:00
parent 01e2681a07
commit 252b5a88b1
7 changed files with 53 additions and 13 deletions
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25
copyparty/multicast.py
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@ -82,6 +82,7 @@ class MCast(object):
self.srv: dict[socket.socket, MC_Sck] = {} # listening sockets
self.sips: set[str] = set() # all listening ips (including failed attempts)
self.ll_ok: set[str] = set() # fallback linklocal IPv4 and IPv6 addresses
self.b2srv: dict[bytes, MC_Sck] = {} # binary-ip -> server socket
self.b4: list[bytes] = [] # sorted list of binary-ips
self.b6: list[bytes] = [] # sorted list of binary-ips
@ -183,11 +184,21 @@ class MCast(object):
srv.ips[oth_ip.split("/")[0]] = ipaddress.ip_network(oth_ip, False)
# gvfs breaks if a linklocal ip appears in a dns reply
ll = {
k: v
for k, v in srv.ips.items()
if k.startswith("169.254") or k.startswith("fe80")
}
rt = {k: v for k, v in srv.ips.items() if k not in ll}
if self.args.ll or not rt:
self.ll_ok.update(list(ll))
if not self.args.ll:
srv.ips = {k: v for k, v in srv.ips.items() if not k.startswith("fe80")}
srv.ips = rt or ll
if not srv.ips:
self.log("no routable IPs on {}; skipping [{}]".format(netdev, ip), 3)
self.log("no IPs on {}; skipping [{}]".format(netdev, ip), 3)
continue
try:
@ -337,6 +348,16 @@ class MCast(object):
# just give it something
ret = list(self.srv.values())[0]
if not ret and cip.startswith("169.254"):
# idk how to map LL IPv4 msgs to nics;
# just pick one and hope for the best
lls = (
x
for x in self.srv.values()
if next((y for y in x.ips if y in self.ll_ok), None)
)
ret = next(lls, None)
if ret:
t = "new client on {} ({}): {}"
self.log(t.format(ret.name, ret.net, cip), 6)