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fix: handle XShell 8 extended handshake (trailing key name) for agent forwarding - #2
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Builds on PR buptczq#91 (xshell compat). XShell 8 build 0119 sends an extended handshake frame carrying a key name after the cookie during agent forwarding; the old check
Length < len(Cookie)rejected it as 'invalid message length', causing XShell to close the probe connection and break forwarding. Truncate the cookie to Length instead.Verified: ssh -vvv localhost through XShell forwarding succeeds (agent returned 1 keys, Authenticated ... using publickey, exit 0).