Generate remotely SSHFP records

grabsshfp.sh

#!/bin/bash

set -e

if [[ "$#" -lt 1 ]]; then
        echo "Usage: $0 <hostname or IP address>"
        exit
fi

host="$1"

TMPFILE="$(mktemp /var/tmp/sshfp.XXXXXX)"
trap 'rm -f ${TMPFILE}' INT TERM EXIT

for proto in rsa dsa ecdsa ed25519; do
        ssh-keyscan -t $proto "$host" > ${TMPFILE} 2>/dev/null
        [[ ! -s "${TMPFILE}" ]] && continue
        sed -ri 's/^[^ ]+ //' ${TMPFILE}
        ssh-keygen -r "$host" -f ${TMPFILE}
done

Sill awesome !
I posted it on https://unix.stackexchange.com/a/759200/155610

I found a bug, because of -e the command will exit if it does not find the key: for example dsa and stop the process
My fix

- ssh-keyscan -t $proto "$host" > ${TMPFILE} 2>/dev/null
+ ssh-keyscan -t $proto "$host" > ${TMPFILE} 2>/dev/null || true

You can see this if you add an echo at the first line of the loop, it shows that it dies