contrib/openresolv/pdnsd.in

   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)"
  33 NL="
  34 "
  35
  36 : ${pdnsd_restart:=pdnsd-ctl config $pdnsd_conf}
  37 signature="# Generated by resolvconf"
  38 signature_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.
  42 remove_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
  66 change_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 "$2"
  84         return 0
  85 }
  86
  87 newresolv="# Generated by resolvconf$NL"
  88 changed=false
  89
  90 # Try to ensure that config dirs exist
  91 if command -v config_mkdirs >/dev/null 2>&1; then
  92         config_mkdirs "$pdnsd_resolv" "$pdnsd_conf"
  93 else
  94         @SBINDIR@/resolvconf -D "$pdnsd_resolv" "$pdnsd_conf"
  95 fi
  96
  97 if [ -n "$pdnsd_resolv" ]; then
  98         for n in $NAMESERVERS; do
  99                 newresolv="${newresolv}nameserver $n$NL"
 100         done
 101 fi
 102
 103 # Only modify the configuration if it exists and we can write to it
 104 if [ -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
 152 fi
 153
 154 if [ -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
 161 fi
 162
 163 if $changed; then
 164         eval $pdnsd_restart
 165 fi