On 08/24/2017 at 02:00 PM, Ziyue Yang wrote:
> ssh target of link local ipv6 might have network interface
> name prefixed by 'kdump-', which is not in known_hosts while
> dumping, leading to failure in dump_ssh.
>
> This commit makes dump_ssh cancel 'StrictHostKeyChecking'
> for link local ipv6 address cases in order to bypass the
> known_hosts, for it's not possible to add 'kdump-' variants
> in hashed known_hosts if there is any need.
>
> Signed-off-by: Ziyue Yang <ziyang@redhat.com>
> ---
>  dracut-kdump.sh | 10 +++++++++-
>  1 file changed, 9 insertions(+), 1 deletion(-)
>
> diff --git a/dracut-kdump.sh b/dracut-kdump.sh
> index b75c2a5..bbb8a45 100755
> --- a/dracut-kdump.sh
> +++ b/dracut-kdump.sh
> @@ -71,10 +71,18 @@ dump_raw()
>
>  dump_ssh()
>  {
> -    local _opt="-i $1 -o BatchMode=yes -o StrictHostKeyChecking=yes"
> +    local _opt="-i $1 -o BatchMode=yes"
>      local _dir="$KDUMP_PATH/$HOST_IP-$DATEDIR"
>      local _host=$2
>
> +    # cancel HostKeyChecking for link-local ipv6 address
> +    # with "kdump-" prefixed interface name
> +    if is_ipv6_link_local $(get_remote_host $_host); then

To be precise, is_ipv6_link_local() is insufficient, I guess we can compare it with "%kdump-eth*" directly.

> +        _opt+=" -o StrictHostKeyChecking=no"
> +    else
> +        _opt+=" -o StrictHostKeyChecking=yes"
> +    fi
> +
>      echo "kdump: saving to $_host:$_dir"
>
>      cat /var/lib/random-seed > /dev/urandom