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Put 'wins hook' example back in. Fixes bug #268)

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(This used to be commit a1e1421d1e)
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Jelmer Vernooij 2003-08-14 01:15:42 +00:00
parent 3b9f84290a
commit 134e7f948d
2 changed files with 102 additions and 0 deletions
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8
examples/wins_hook/README Normal file
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This is an example script for doing dynamic DNS updates from the WINS
database. You use this by putting the full path to the script in the
"wins hook" option in smb.conf. Remember to mark the script executable
and to set the right domain at the top of the script.
See the BIND documentation for how to enable dynamic DNS
updates. Remember to restrict the updates as far as you can to reduce
the security risks inherent in dynamic DNS.

94
examples/wins_hook/dns_update Normal file
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#!/bin/sh
#
# Example script for "wins hook". This attempts to update the DNS with
# new A records for the NETBIOS name that Samba passes us. We do this
# the simple way, by deleting all DNS records for the name and then
# readding all the expected 'A' records.
#
# Written by Stephen Rothwell <sfr@linuxcare.com>
#
#
# Configurable things
#
# The domain in which to create names
# YOU MUST CHANGE THIS
# N.B. include the trailing dot
#
# It is a good idea to use a subdomain of your primary domain to ensure
# that rogue machines can't take over (or delete) important names on
# your network.
DOMAIN=wins.example.com.
#
# The DNS TTL to give the records (in seconds)
#
TTL=3600
#
# NETBIOS name types that we want to create DNS records for:
# 20 is server
# 00 is workstation
# 03 is user
#
USEFUL_TYPES="20 00 03"
#
# The name of a cache file to use to avoid continual updates
# of the same name and IP addresses. If you comment this out
# then the cache is not kept at all.
#
#CACHE_FILE=/usr/local/samba/var/wins_update.cache
if [ $# -lt 4 ]; then
echo "Usage: $0 op name type ttl [ip_addr ...]" 1>&2
echo " op is one of add, refresh, delete" 1>&2
echo " name is the NETBIOS name" 1>&2
echo " type is the NETBIOS name type" 1>&2
echo " ttl is the NETBIOS time to live" 1>&2
echo " ip_addr's are the remaining IP addresses for this name" 1>&2
exit 1
fi
NSUPDATE=`which nsupdate`
[ -x "$NSUPDATE" ] || NSUPDATE=/usr/bin/nsupdate
[ -x "$NSUPDATE" ] || NSUPDATE=/sbin/nsupdate
[ -x "$NSUPDATE" ] || NSUPDATE=/usr/sbin/nsupdate
[ -x "$NSUPDATE" ] || {
echo "Cannot find nsupdate." 1>&2
exit 1
}
OP=$1
NAME=$2
TYPE=$3
WINS_TTL=$4
shift 4
IP_ADDRS="$@"
do_update=0
for i in $USEFUL_TYPES
do
[ "$TYPE" = "$i" ] && do_update=1
done
[ $do_update = 1 ] || exit 0
if [ -n "$CACHE_FILE" ]; then
if [ -r "$CACHE_FILE" ]; then
fgrep -q -x -i "$NAME $IP_ADDRS" "$CACHE_FILE" &&
exit 0
grep -v -i "^$NAME " "$CACHE_FILE" >"$CACHE_FILE".$$
fi
echo "$NAME $IP_ADDRS" >>"$CACHE_FILE".$$
mv "$CACHE_FILE" "$CACHE_FILE".old 2>/dev/null
mv "$CACHE_FILE".$$ "$CACHE_FILE"
fi
{
echo update delete $NAME.$DOMAIN
for i in $IP_ADDRS
do
echo update add $NAME.$DOMAIN $TTL A $i
done
echo
} 2>/dev/null | $NSUPDATE >/dev/null 2>&1 &
exit 0