Solved issue #2910 - Added support for IPv6 with fallback to IPv4 for ssh

Solved issue #2910 (closed)

Description

Added support for IPv6 with fallback to IPv4 for ssh As ssh_options_set with SSH_OPTIONS_HOST allows for hostnames and IPs, it's just a matter of resolving the hostname before calling ssh_connect. I added a call to getaddrinfo and when IPv4 and IPv6 are returned, it uses IPv6 by default, then if the connection fails, it falls back to IPv4.

Related Issue

Issue #2910 (closed) "dual-stack IPv4/6 host can't be connected via domain name if the remote port is only opened for IPv4"

Motivation and Context

How Has This Been Tested?

I tested it on a dual stack machine of course, that tries to connect to another dual stack machine. OS used: Devuan Chimaera and Debian Bullseye

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.