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| author | David Kaspar [Dee'Kej] <dkaspar@redhat.com> | 2016-10-28 10:59:13 +0200 |
|---|---|---|
| committer | Lukáš Nykrýn <lnykryn@redhat.com> | 2016-11-01 10:14:31 +0100 |
| commit | 78ebd68cd40a229313ff3130d7dd335e88bb4d44 (patch) | |
| tree | a186f51105a4830a8790ee2c9dbb7a5789cbcd55 | |
| parent | b6a3a1dd5d783229a2bb6e42993fe6b09e0583d2 (diff) | |
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netconsole: resolve domain name via 'getent' instead of 'hosts'
| -rw-r--r-- | rc.d/init.d/netconsole | 23 |
1 files changed, 20 insertions, 3 deletions
diff --git a/rc.d/init.d/netconsole b/rc.d/init.d/netconsole index 1b10af2d..ad51bd22 100644 --- a/rc.d/init.d/netconsole +++ b/rc.d/init.d/netconsole @@ -67,9 +67,26 @@ start () SYSLOGOPTS= # syslogd server, if any if [ -n "$SYSLOGADDR" ]; then - MATCH="^([0-9]{1,3}\.){3}[0-9]{1,3}$" - if ! [[ "$SYSLOGADDR" =~ $MATCH ]]; then - SYSLOGADDR=$(LANG=C host $SYSLOGADDR 2>/dev/null | awk '/has address / { print $NF }') + # IPv6 regex also covers 4to6, zero-compressed, and link-local addresses with zone-index addresses. + # It should also cover IPv4-embedded, IPv4-mapped, and IPv4-translated IPv6 addresses. + # Taken from: http://stackoverflow.com/a/17871737/3481531 + IPv4_regex="^([0-9]{1,3}\.){3}[0-9]{1,3}$" + IPv6_regex="^(([0-9a-fA-F]{1,4}:){7,7}[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,7}:|([0-9a-fA-F]{1,4}:){1,6}:[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,5}(:[0-9a-fA-F]{1,4}){1,2}|([0-9a-fA-F]{1,4}:){1,4}(:[0-9a-fA-F]{1,4}){1,3}|([0-9a-fA-F]{1,4}:){1,3}(:[0-9a-fA-F]{1,4}){1,4}|([0-9a-fA-F]{1,4}:){1,2}(:[0-9a-fA-F]{1,4}){1,5}|[0-9a-fA-F]{1,4}:((:[0-9a-fA-F]{1,4}){1,6})|:((:[0-9a-fA-F]{1,4}){1,7}|:)|fe80:(:[0-9a-fA-F]{0,4}){0,4}%[0-9a-zA-Z]{1,}|::(ffff(:0{1,4}){0,1}:){0,1}((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])|([0-9a-fA-F]{1,4}:){1,4}:((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9]))$" + if ! [[ "$SYSLOGADDR" =~ $IPv4_regex ]] && ! [[ "$SYSLOGADDR" =~ $IPv6_regex ]]; then + # Use IPv4 by default: + SYSLOGADDR="$(LANG=C getent ahostsv4 $SYSLOGADDR 2> /dev/null)" + + # Try IPv6 in case IPv4 resolution has failed: + if [[ $? -eq 2 ]]; then + SYSLOGADDR="$(LANG=C getent ahostsv6 $SYSLOGADDR 2> /dev/null)" + fi + + if [[ $? -ne 0 ]]; then + echo $"Unable to resolve IP address specified in /etc/sysconfig/netconsole" 1>&2 + exit 6 + fi + + SYSLOGADDR="$(echo "$SYSLOGADDR" | head -1 | cut --delimiter=' ' --fields=1)" fi fi if [ -z "$SYSLOGADDR" ] ; then |