TcpSocketHandler::listen() does not loop over IPv6 interfaces while connecting to an IPv4 host

[gkiessling]

Eternal Terminal client fails for me when trying to forward a port. If I remove the port forwarding from the command below, et connects successfully:

$ et --verbose=9 -t "3389:3389"  10.1.2.3
Error binding 10/1/6: 99 Cannot assign requested address

Error establishing port forward: Error binding port 3389: 99 Cannot assign requested address

This error occurs no matter what source port I choose. It is not failing because the port is in use.

Looking at the TcpSocketHandler::listen() source for the error output, it looks like it is failing when trying to bind to an IPv6 interface, as the addrinfo.ai_family value 10 maps to AF_INET6. But given that I've specified an IPv4 host address on the command line, I believe the correct behaviour for et in this scenario should be to skip over IPv6 interfaces. To test this idea, I hard-coded a continue for the case when p->ai_family == AF_INET6 and my et connection with port forwarding subsequently worked (this was just a test, not a proposed solution for the bug).

etclientLogs.tar.gz

[gkiessling]

$ cat /etc/*release*
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=22.04
DISTRIB_CODENAME=jammy
DISTRIB_DESCRIPTION="Ubuntu 22.04.5 LTS"
PRETTY_NAME="Ubuntu 22.04.5 LTS"
NAME="Ubuntu"
VERSION_ID="22.04"
VERSION="22.04.5 LTS (Jammy Jellyfish)"
VERSION_CODENAME=jammy
ID=ubuntu
ID_LIKE=debian
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
UBUNTU_CODENAME=jammy

[gkiessling]

$ sudo lshw -c cpu
  *-cpu                     
       description: CPU
       product: 13th Gen Intel(R) Core(TM) i7-13700H
       vendor: Intel Corp.
       physical id: 400
       bus info: cpu@0
       version: 6.186.2
       slot: U3E1
       size: 642MHz
       capacity: 4800MHz
       width: 64 bits
       clock: 100MHz
       ...