contrib/openresolv/pdnsd.in

   1 #!/bin/sh
   2 # Copyright (c) 2010-2013 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 "$pdnsd_conf" -a -z "$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         local m1="$1" m2="$2" x= line= in_marker=0
  45
  46         shift; shift
  47         if type sed >/dev/null 2>&1; then
  48                 sed "/^$m1/,/^$m2/d" $@
  49         else
  50                 for x; do
  51                         while read -r line; do
  52                                 case "$line" in
  53                                 "$m1"*) in_marker=1;;
  54                                 "$m2"*) in_marker=0;;
  55                                 *) [ $in_marker = 0 ] && echo "$line";;
  56                                 esac
  57                         done < "$x"
  58                 done
  59         fi
  60 }
  61
  62 # Compare two files
  63 # If different, replace first with second otherwise remove second
  64 change_file()
  65 {
  66         if [ -e "$1" ]; then
  67                 if type cmp >/dev/null 2>&1; then
  68                         cmp -s "$1" "$2"
  69                 elif type diff >/dev/null 2>&1; then
  70                         diff -q "$1" "$2" >/dev/null
  71                 else
  72                         # Hopefully we're only working on small text files ...
  73                         [ "$(cat "$1")" = "$(cat "$2")" ]
  74                 fi
  75                 if [ $? -eq 0 ]; then
  76                         rm -f "$2"
  77                         return 1
  78                 fi
  79         fi
  80         cat "$2" > "$1"
  81         rm -f "$2"
  82         return 0
  83 }
  84
  85 newresolv="# Generated by resolvconf$NL"
  86 changed=false
  87
  88 # Try to ensure that config dirs exist
  89 if type config_mkdirs >/dev/null 2>&1; then
  90         config_mkdirs "$pdnsd_resolv" "$pdnsd_conf"
  91 else
  92         @SBINDIR@/resolvconf -D "$pdnsd_resolv" "$pdnsd_conf"
  93 fi
  94
  95 if [ -n "$pdnsd_resolv" ]; then
  96         for n in $NAMESERVERS; do
  97                 newresolv="${newresolv}nameserver $n$NL"
  98         done
  99 fi
 100
 101 # Only modify the configuration if it exists and we can write to it
 102 if [ -w "$pdnsd_conf" ]; then
 103         cf="$pdnsd_conf.new"
 104         newconf=
 105
 106         if [ -z "$pdnsd_resolv" ]; then
 107                 newconf="${newconf}server {$NL"
 108                 newconf="${newconf}     label=resolvconf;$NL"
 109                 if [ -n "$NAMESERVERS" ]; then
 110                         newconf="${newconf}     ip="
 111                         first=true
 112                         for n in $NAMESERVERS; do
 113                                 if $first; then
 114                                         first=false
 115                                 else
 116                                         newconf="${newconf},"
 117                                 fi
 118                                 newconf="$newconf$n"
 119                         done
 120                         newconf="${newconf};$NL"
 121                 fi
 122                 newconf="${newconf}}$NL"
 123         fi
 124
 125         for d in $DOMAINS; do
 126                 newconf="${newconf}server {$NL"
 127                 newconf="${newconf}     include=.${d%%:*}.;$NL"
 128                 newconf="${newconf}     policy=excluded;$NL"
 129                 newconf="${newconf}     ip="
 130                 ns="${d#*:}"
 131                 while [ -n "$ns" ]; do
 132                         newconf="${newconf}${ns%%,*}"
 133                         [ "$ns" = "${ns#*,}" ] && break
 134                         ns="${ns#*,}"
 135                         newconf="${newconf},"
 136                 done
 137                 newconf="${newconf};$NL}$NL"
 138         done
 139
 140         rm -f "$cf"
 141         remove_markers "$signature" "$signature_end" "$pdnsd_conf" > "$cf"
 142         if [ -n "$newconf" ]; then
 143                 echo "$signature" >> "$cf"
 144                 printf %s "$newconf" >> "$cf"
 145                 echo "$signature_end" >> "$cf"
 146         fi
 147         if change_file "$pdnsd_conf" "$cf"; then
 148                 changed=true
 149         fi
 150 fi
 151
 152 if [ -n "$pdnsd_resolv" ]; then
 153         if [ ! -f "$pdnsd_resolv" ] || \
 154                 [ "$(cat "$pdnsd_resolv")" != "$(printf %s "$newresolv")" ]
 155         then
 156                 changed=true
 157                 printf %s "$newresolv" >"$pdnsd_resolv"
 158         fi
 159 fi
 160
 161 if $changed; then
 162         eval $pdnsd_restart
 163 fi