1#!/bin/sh 2# Copyright (c) 2010-2023 Roy Marples 3# All rights reserved 4 5# pdnsd subscriber for resolvconf 6 7# Redistribution and use in source and binary forms, with or without 8# modification, are permitted provided that the following conditions 9# are met: 10# * Redistributions of source code must retain the above copyright 11# notice, this list of conditions and the following disclaimer. 12# * Redistributions in binary form must reproduce the above 13# copyright notice, this list of conditions and the following 14# disclaimer in the documentation and/or other materials provided 15# with the distribution. 16# 17# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 18# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 19# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 20# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 21# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 22# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 23# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 27# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 29[ -f "@SYSCONFDIR@"/resolvconf.conf ] || exit 0 30. "@SYSCONFDIR@/resolvconf.conf" || exit 1 31[ -z "${pdnsd_conf}${pdnsd_resolv}" ] && exit 0 32[ -z "$RESOLVCONF" ] && eval "$(@SBINDIR@/resolvconf -v)" 33NL=" 34" 35 36: ${pdnsd_restart:=pdnsd-ctl config $pdnsd_conf} 37signature="# Generated by resolvconf" 38signature_end="# End of resolvconf" 39 40# We normally use sed to remove markers from a configuration file 41# but sed may not always be available at the time. 42remove_markers() 43{ 44 m1="$1" 45 m2="$2" 46 in_marker=0 47 48 shift; shift 49 if command -v sed >/dev/null 2>&1; then 50 sed "/^$m1/,/^$m2/d" $@ 51 else 52 for x do 53 while read line; do 54 case "$line" in 55 "$m1"*) in_marker=1;; 56 "$m2"*) in_marker=0;; 57 *) [ $in_marker = 0 ] && echo "$line";; 58 esac 59 done < "$x" 60 done 61 fi 62} 63 64# Compare two files 65# If different, replace first with second otherwise remove second 66change_file() 67{ 68 if [ -e "$1" ]; then 69 if command -v cmp >/dev/null 2>&1; then 70 cmp -s "$1" "$2" 71 elif command -v diff >/dev/null 2>&1; then 72 diff -q "$1" "$2" >/dev/null 73 else 74 # Hopefully we're only working on small text files ... 75 [ "$(cat "$1")" = "$(cat "$2")" ] 76 fi 77 if [ $? -eq 0 ]; then 78 rm -f "$2" 79 return 1 80 fi 81 fi 82 cat "$2" > "$1" 83 rm -f "$2" 84 return 0 85} 86 87newresolv="# Generated by resolvconf$NL" 88changed=false 89 90# Try to ensure that config dirs exist 91if command -v config_mkdirs >/dev/null 2>&1; then 92 config_mkdirs "$pdnsd_resolv" "$pdnsd_conf" 93else 94 @SBINDIR@/resolvconf -D "$pdnsd_resolv" "$pdnsd_conf" 95fi 96 97if [ -n "$pdnsd_resolv" ]; then 98 for n in $NAMESERVERS; do 99 newresolv="${newresolv}nameserver $n$NL" 100 done 101fi 102 103# Only modify the configuration if it exists and we can write to it 104if [ -w "$pdnsd_conf" ]; then 105 cf="$pdnsd_conf.new" 106 newconf= 107 108 if [ -z "$pdnsd_resolv" ]; then 109 newconf="${newconf}server {$NL" 110 newconf="${newconf} label=resolvconf;$NL" 111 if [ -n "$NAMESERVERS" ]; then 112 newconf="${newconf} ip=" 113 first=true 114 for n in $NAMESERVERS; do 115 if $first; then 116 first=false 117 else 118 newconf="${newconf}," 119 fi 120 newconf="$newconf$n" 121 done 122 newconf="${newconf};$NL" 123 fi 124 newconf="${newconf}}$NL" 125 fi 126 127 for d in $DOMAINS; do 128 newconf="${newconf}server {$NL" 129 newconf="${newconf} include=.${d%%:*}.;$NL" 130 newconf="${newconf} policy=excluded;$NL" 131 newconf="${newconf} ip=" 132 ns="${d#*:}" 133 while [ -n "$ns" ]; do 134 newconf="${newconf}${ns%%,*}" 135 [ "$ns" = "${ns#*,}" ] && break 136 ns="${ns#*,}" 137 newconf="${newconf}," 138 done 139 newconf="${newconf};$NL}$NL" 140 done 141 142 rm -f "$cf" 143 remove_markers "$signature" "$signature_end" "$pdnsd_conf" > "$cf" 144 if [ -n "$newconf" ]; then 145 echo "$signature" >> "$cf" 146 printf %s "$newconf" >> "$cf" 147 echo "$signature_end" >> "$cf" 148 fi 149 if change_file "$pdnsd_conf" "$cf"; then 150 changed=true 151 fi 152fi 153 154if [ -n "$pdnsd_resolv" ]; then 155 if [ ! -f "$pdnsd_resolv" ] || \ 156 [ "$(cat "$pdnsd_resolv")" != "$(printf %s "$newresolv")" ] 157 then 158 changed=true 159 printf %s "$newresolv" >"$pdnsd_resolv" 160 fi 161fi 162 163if $changed; then 164 eval $pdnsd_restart 165fi 166