From: Peter Palfrader <peter@palfrader.org>
Date: Mon, 21 Jun 2010 11:44:55 +0000 (+0200)
Subject: Do some hostname validity checking
X-Git-Url: https://git.adam-barratt.org.uk/?a=commitdiff_plain;h=eeefce1d3462c2f841742febb05447df96cbcd22;p=mirror%2Fdsa-nagios.git

Do some hostname validity checking
---

diff --git a/dsa-nagios-checks/checks/dsa-check-log-age-loghost b/dsa-nagios-checks/checks/dsa-check-log-age-loghost
index 256caef..391f330 100755
--- a/dsa-nagios-checks/checks/dsa-check-log-age-loghost
+++ b/dsa-nagios-checks/checks/dsa-check-log-age-loghost
@@ -29,10 +29,15 @@ usage(){
 
 host="$1"
 if [ -z "$host" ] || [ "$host" = "-h" ] ||  [ "$host" = "--help" ]; then
-	echo >&2 "$0: Usage: $0 <host>"
+	echo >&2 "Usage: $0 <host>"
 	usage 3
 fi
 
+if [ "${host/[^a-z0-9]/}" != "$host" ]; then
+	echo >&2 "$0: Invalid hostname $1"
+	exit 3
+fi
+
 ts=$(date -d 'now' +'%Y/%m/%d')
 file="/var/log/hosts/$host/$ts/syslog"
 if [ ! -e "$file" ]; then