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#!/bin/sh
set -e
DEFAULT_AUTH_TYPE=ed25519
in_group()
{
local g
for g in $(groups)
do
[ "$g" = "$1" ] && return
done
false
}
ssh_keytag_to_path_fragment()
{
case "$1" in
ssh-dss) echo dsa ;;
ecdsa-sha2-nistp256) echo ecdsa ;;
ssh-rsa|ssh-ed25519) echo ${1#ssh-} ;;
*) return 1 ;;
esac
}
path_fragment_to_ssh_keytag()
{
case "$1" in
ssh-dss|ecdsa-sha2-nistp256|ssh-rsa|ssh-ed25519) echo $1;;
dss|rsa|ed25519) echo ssh-$1 ;;
dsa) echo ssh-dss ;;
ecdsa) echo ecdsa-sha2-nistp256 ;;
*) return 1 ;;
esac
}
get_dyndns_domain()
{
fragment=$(ssh_keytag_to_path_fragment "$1") || return
host_keyfile=/etc/ssh/ssh_host_${fragment}_key
user_keyfile=$HOME/.ssh/id_${fragment}
set -- -q dyndns@cryptonomic.net
if [ -r "$host_keyfile" ]
then
set -- ssh -i "$host_keyfile" "$@"
elif in_group sudo
then
set -- sudo ssh -i "$host_keyfile" "$@"
elif [ -r "$user_keyfile" ]
then
set -- ssh -i "$user_keyfile" "$@"
else
set -- ssh "$@"
fi
"$@"
}
AUTH_TYPE=${1:-$DEFAULT_AUTH_TYPE}
AUTH_KEYTAG=$(path_fragment_to_ssh_keytag "$AUTH_TYPE")
get_dyndns_domain "$AUTH_KEYTAG"
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