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#!/bin/sh
kiki_hostkey=/var/cache/kiki/config/ssh_host_rsa_key
debian_hostkey=/etc/ssh/ssh_host_rsa_key
determine_lan_ip()
{
ip -4 -oneline addr show |
while read n dev _ ip rest; do
case "$rest" in
*'scope global'*) ;;
*) continue ;;
esac
# Exclude our IP address on br0 -- hosts connected via this device should
# be receiving DNS servers from us via DHCP, so dyndns is unnecessary.
# However, perhaps we could install a third entry in the dyndns. (Perhaps
# something like *.br0.ssh.cryptonomic.net would give us automatic names
# for all devices.)
case "$dev" in
br0) continue ;;
esac
echo ${ip%/*}
break
done
}
ssh_cryptonomic_net__known_hosts()
{
cat <<'END'
|1|ORqVRkqd0LO25vHCB0LezHAgwRE=|ih7EYLpvg9jpU86/0Od0N8Ur36c= ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBHkIETz7wmKd7TZgb3NPeUElZDjZqw2VPd8yDOBTj5UzUBmcgCyE1oCS3Oe1iO9zJWpPtG0QyYa29lKi+vN6pN4=
END
}
tmpfile=$(mktemp) || exit 1
trap 'rm -f "$tmpfile"' EXIT
ssh_cryptonomic_net__known_hosts > "$tmpfile"
lan_ip=$(determine_lan_ip)
if [ "$lan_ip" ]; then
set -- lan "$lan_ip"
else
set --
fi
hostkey=
for f in "$kiki_hostkey" "$debian_hostkey"; do
[ -r "$f" ] || continue
hostkey=$f
break
done
ssh -o GlobalKnownHostsFile="$tmpfile" ${hostkey:+ -i "$hostkey"} dyndns@ssh.cryptonomic.net "$@"
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