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Improve message when bind fails with a IPv6 address

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The comments at the end of issue #673 shows an example where sshuttle
exits with an OSError exception when it cannot bind to an IPv6
address. This patch makes a suggestion to try the --disable-ipv6
option instead of the cryptic error message.
This commit is contained in:
Scott Kuhl 2022-02-04 11:22:56 -05:00
parent c783fdb472
commit 0c3b615736
1 changed files with 16 additions and 1 deletions
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17
sshuttle/client.py
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@ -164,7 +164,22 @@ class MultiListener:
self.bind_called = True
if address_v6 is not None:
self.v6 = socket.socket(socket.AF_INET6, self.type, self.proto)
self.v6.bind(address_v6)
try:
self.v6.bind(address_v6)
except OSError as e:
if e.errno == errno.EADDRNOTAVAIL:
# On an IPv6 Linux machine, this situation occurs
# if you run the following prior to running
# sshuttle:
#
# echo 1 > /proc/sys/net/ipv6/conf/all/disable_ipv6
# echo 1 > /proc/sys/net/ipv6/conf/default/disable_ipv6
raise Fatal("Could not bind to an IPv6 socket with "
"address %s and port %s. "
"Potential workaround: Run sshuttle "
"with '--disable-ipv6'."
% (str(address_v6[0]), str(address_v6[1])))
raise e
else:
self.v6 = None
if address_v4 is not None: