[PATCH v8 3/4] dracut-kdump.sh: support 'kdump-' prefixed interfaces for link local ipv6

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 1) adds a helper function is_ipv6_link_local_ifname_prefixed to find out whether a host is a link local ipv6 address with 'kdump-' prefixed ifname; 2) 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(a)redhat.com&gt; --- dracut-kdump.sh | 10 +++++++++- kdump-lib.sh | 8 ++++++++ 2 files changed, 17 insertions(+), 1 deletion(-) diff --git a/dracut-kdump.sh b/dracut-kdump.sh index b75c2a5..2c32e4e 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_ifname_prefixed $(get_remote_host $_host); then + _opt+=" -o StrictHostKeyChecking=no" + else + _opt+=" -o StrictHostKeyChecking=yes" + fi + echo "kdump: saving to $_host:$_dir" cat /var/lib/random-seed > /dev/urandom diff --git a/kdump-lib.sh b/kdump-lib.sh index fb3e354..06548fe 100755 --- a/kdump-lib.sh +++ b/kdump-lib.sh @@ -317,6 +317,14 @@ is_ipv6_link_local() echo $1 | grep -q "^fe80::" } +is_ipv6_link_local_ifname_prefixed() +{ + is_ipv6_link_local $1 && { + local _postfix=${1##*\%} + echo $_postfix | grep -q "^kdump-" + } +} + # get ip address or hostname from nfs/ssh config value get_remote_host() { -- 2.9.3