166 lines
4.3 KiB
Bash
166 lines
4.3 KiB
Bash
#!/bin/sh
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# Copyright (c) 2010-2018 Roy Marples
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# All rights reserved
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# pdnsd subscriber for resolvconf
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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# * Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# * Redistributions in binary form must reproduce the above
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# copyright notice, this list of conditions and the following
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# disclaimer in the documentation and/or other materials provided
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# with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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[ -f "@SYSCONFDIR@"/resolvconf.conf ] || exit 0
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. "@SYSCONFDIR@/resolvconf.conf" || exit 1
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[ -z "${pdnsd_conf}${pdnsd_resolv}" ] && exit 0
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[ -z "$RESOLVCONF" ] && eval "$(@SBINDIR@/resolvconf -v)"
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NL="
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"
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: ${pdnsd_restart:=pdnsd-ctl config $pdnsd_conf}
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signature="# Generated by resolvconf"
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signature_end="# End of resolvconf"
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# We normally use sed to remove markers from a configuration file
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# but sed may not always be available at the time.
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remove_markers()
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{
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m1="$1"
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m2="$2"
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in_marker=0
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shift; shift
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if type sed >/dev/null 2>&1; then
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sed "/^$m1/,/^$m2/d" $@
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else
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for x do
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while read line; do
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case "$line" in
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"$m1"*) in_marker=1;;
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"$m2"*) in_marker=0;;
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*) [ $in_marker = 0 ] && echo "$line";;
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esac
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done < "$x"
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done
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fi
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}
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# Compare two files
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# If different, replace first with second otherwise remove second
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change_file()
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{
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if [ -e "$1" ]; then
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if type cmp >/dev/null 2>&1; then
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cmp -s "$1" "$2"
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elif type diff >/dev/null 2>&1; then
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diff -q "$1" "$2" >/dev/null
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else
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# Hopefully we're only working on small text files ...
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[ "$(cat "$1")" = "$(cat "$2")" ]
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fi
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if [ $? -eq 0 ]; then
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rm -f "$2"
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return 1
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fi
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fi
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cat "$2" > "$1"
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rm -f "$2"
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return 0
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}
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newresolv="# Generated by resolvconf$NL"
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changed=false
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# Try to ensure that config dirs exist
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if type config_mkdirs >/dev/null 2>&1; then
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config_mkdirs "$pdnsd_resolv" "$pdnsd_conf"
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else
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@SBINDIR@/resolvconf -D "$pdnsd_resolv" "$pdnsd_conf"
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fi
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if [ -n "$pdnsd_resolv" ]; then
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for n in $NAMESERVERS; do
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newresolv="${newresolv}nameserver $n$NL"
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done
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fi
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# Only modify the configuration if it exists and we can write to it
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if [ -w "$pdnsd_conf" ]; then
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cf="$pdnsd_conf.new"
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newconf=
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if [ -z "$pdnsd_resolv" ]; then
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newconf="${newconf}server {$NL"
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newconf="${newconf} label=resolvconf;$NL"
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if [ -n "$NAMESERVERS" ]; then
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newconf="${newconf} ip="
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first=true
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for n in $NAMESERVERS; do
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if $first; then
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first=false
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else
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newconf="${newconf},"
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fi
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newconf="$newconf$n"
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done
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newconf="${newconf};$NL"
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fi
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newconf="${newconf}}$NL"
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fi
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for d in $DOMAINS; do
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newconf="${newconf}server {$NL"
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newconf="${newconf} include=.${d%%:*}.;$NL"
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newconf="${newconf} policy=excluded;$NL"
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newconf="${newconf} ip="
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ns="${d#*:}"
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while [ -n "$ns" ]; do
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newconf="${newconf}${ns%%,*}"
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[ "$ns" = "${ns#*,}" ] && break
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ns="${ns#*,}"
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newconf="${newconf},"
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done
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newconf="${newconf};$NL}$NL"
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done
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rm -f "$cf"
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remove_markers "$signature" "$signature_end" "$pdnsd_conf" > "$cf"
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if [ -n "$newconf" ]; then
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echo "$signature" >> "$cf"
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printf %s "$newconf" >> "$cf"
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echo "$signature_end" >> "$cf"
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fi
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if change_file "$pdnsd_conf" "$cf"; then
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changed=true
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fi
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fi
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if [ -n "$pdnsd_resolv" ]; then
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if [ ! -f "$pdnsd_resolv" ] || \
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[ "$(cat "$pdnsd_resolv")" != "$(printf %s "$newresolv")" ]
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then
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changed=true
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printf %s "$newresolv" >"$pdnsd_resolv"
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fi
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fi
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if $changed; then
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eval $pdnsd_restart
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fi
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