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|
#!/bin/sh
# Copyright (c) 2010-2013 Roy Marples
# All rights reserved
# pdnsd subscriber for resolvconf
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following
# disclaimer in the documentation and/or other materials provided
# with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
[ -f "@SYSCONFDIR@"/resolvconf.conf ] || exit 0
. "@SYSCONFDIR@/resolvconf.conf" || exit 1
[ -z "$pdnsd_conf" -a -z "$pdnsd_resolv" ] && exit 0
[ -z "$RESOLVCONF" ] && eval "$(@SBINDIR@/resolvconf -v)"
NL="
"
: ${pdnsd_restart:=pdnsd-ctl config $pdnsd_conf}
signature="# Generated by resolvconf"
signature_end="# End of resolvconf"
# We normally use sed to remove markers from a configuration file
# but sed may not always be available at the time.
remove_markers()
{
local m1="$1" m2="$2" x= line= in_marker=0
shift; shift
if type sed >/dev/null 2>&1; then
sed "/^$m1/,/^$m2/d" $@
else
for x; do
while read -r line; do
case "$line" in
"$m1"*) in_marker=1;;
"$m2"*) in_marker=0;;
*) [ $in_marker = 0 ] && echo "$line";;
esac
done < "$x"
done
fi
}
# Compare two files
# If different, replace first with second otherwise remove second
change_file()
{
if [ -e "$1" ]; then
if type cmp >/dev/null 2>&1; then
cmp -s "$1" "$2"
elif type diff >/dev/null 2>&1; then
diff -q "$1" "$2" >/dev/null
else
# Hopefully we're only working on small text files ...
[ "$(cat "$1")" = "$(cat "$2")" ]
fi
if [ $? -eq 0 ]; then
rm -f "$2"
return 1
fi
fi
cat "$2" > "$1"
rm -f "$2"
return 0
}
newresolv="# Generated by resolvconf$NL"
changed=false
# Try to ensure that config dirs exist
if type config_mkdirs >/dev/null 2>&1; then
config_mkdirs "$pdnsd_resolv" "$pdnsd_conf"
else
@SBINDIR@/resolvconf -D "$pdnsd_resolv" "$pdnsd_conf"
fi
if [ -n "$pdnsd_resolv" ]; then
for n in $NAMESERVERS; do
newresolv="${newresolv}nameserver $n$NL"
done
fi
# Only modify the configuration if it exists and we can write to it
if [ -w "$pdnsd_conf" ]; then
cf="$pdnsd_conf.new"
newconf=
if [ -z "$pdnsd_resolv" ]; then
newconf="${newconf}server {$NL"
newconf="${newconf} label=resolvconf;$NL"
if [ -n "$NAMESERVERS" ]; then
newconf="${newconf} ip="
first=true
for n in $NAMESERVERS; do
if $first; then
first=false
else
newconf="${newconf},"
fi
newconf="$newconf$n"
done
newconf="${newconf};$NL"
fi
newconf="${newconf}}$NL"
fi
for d in $DOMAINS; do
newconf="${newconf}server {$NL"
newconf="${newconf} include=.${d%%:*}.;$NL"
newconf="${newconf} policy=excluded;$NL"
newconf="${newconf} ip="
ns="${d#*:}"
while [ -n "$ns" ]; do
newconf="${newconf}${ns%%,*}"
[ "$ns" = "${ns#*,}" ] && break
ns="${ns#*,}"
newconf="${newconf},"
done
newconf="${newconf};$NL}$NL"
done
rm -f "$cf"
remove_markers "$signature" "$signature_end" "$pdnsd_conf" > "$cf"
if [ -n "$newconf" ]; then
echo "$signature" >> "$cf"
printf %s "$newconf" >> "$cf"
echo "$signature_end" >> "$cf"
fi
if change_file "$pdnsd_conf" "$cf"; then
changed=true
fi
fi
if [ -n "$pdnsd_resolv" ]; then
if [ ! -f "$pdnsd_resolv" ] || \
[ "$(cat "$pdnsd_resolv")" != "$(printf %s "$newresolv")" ]
then
changed=true
printf %s "$newresolv" >"$pdnsd_resolv"
fi
fi
if $changed; then
eval $pdnsd_restart
fi
|
