contrib/openresolv/pdnsd.in

   1 #!/bin/sh
   2 # Copyright (c) 2010 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 "$RESOLVCONF" ] && eval "$(@PREFIX@/sbin/resolvconf -v)"
  33
  34 : ${pdnsd_restart:=pdnsd-ctl config $pdnsd_conf}
  35 signature="# Generated by resolvconf"
  36 signature_end="# End of resolvconf"
  37
  38 # We normally use sed to remove markers from a configuration file
  39 # but sed may not always be available at the time.
  40 remove_markers()
  41 {
  42         local m1="$1" m2="$2" x= line= in_marker=0
  43
  44         shift; shift
  45         if type sed >/dev/null 2>&1; then
  46                 sed "/^$m1/,/^$m2/d" $@
  47         else
  48                 for x; do
  49                         while read line; do
  50                                 case "$line" in
  51                                 "$m1"*) in_marker=1;;
  52                                 "$m2"*) in_marker=0;;
  53                                 *) [ $in_marker = 0 ] && echo "$line";;
  54                                 esac
  55                         done < "$x"
  56                 done
  57         fi
  58 }
  59
  60 # Compare two files
  61 # If different, replace first with second otherwise remove second
  62 change_file()
  63 {
  64         if [ -e "$1" ]; then
  65                 if type cmp >/dev/null 2>&1; then
  66                         cmp -s "$1" "$2"
  67                 elif type diff >/dev/null 2>&1; then
  68                         diff -q "$1" "$2" >/dev/null
  69                 else
  70                         # Hopefully we're only working on small text files ...
  71                         [ "$(cat "$1")" = "$(cat "$2")" ]
  72                 fi
  73                 if [ $? -eq 0 ]; then
  74                         rm -f "$2"
  75                         return 1
  76                 fi
  77         fi
  78         cat "$2" > "$1"
  79         rm -f "$2"
  80         return 0
  81 }
  82
  83 newresolv="# Generated by resolvconf\n"
  84 changed=false
  85
  86 if [ -n "$pdnsd_resolv" ]; then
  87         for n in $NAMESERVERS; do
  88                 newresolv="${newresolv}nameserver $n\n"
  89         done
  90 fi
  91
  92 if [ -n "$pdnsd_conf" ]; then
  93         cf="$pdnsd_conf.new"
  94         newconf=
  95
  96         if [ -z "$pdnsd_resolv" ]; then
  97                 newconf="${newconf}server {\n"
  98                 newconf="${newconf}\tlabel=resolvconf;\n"
  99                 if [ -n "$NAMESERVERS" ]; then
 100                         newconf="${newconf}\tip="
 101                         first=true
 102                         for n in $NAMESERVERS; do
 103                                 if $first; then
 104                                         first=false
 105                                 else
 106                                         newconf="${newconf},"
 107                                 fi
 108                                 newconf="$newconf$n"
 109                         done
 110                         newconf="${newconf};\n"
 111                 fi
 112                 newconf="${newconf}}\n"
 113         fi
 114
 115         for d in $DOMAINS; do
 116                 newconf="${newconf}server {\n"
 117                 newconf="${newconf}\tinclude=.${d%%:*}.;\n"
 118                 newconf="${newconf}\tpolicy=excluded;\n"
 119                 newconf="${newconf}\tip="
 120                 ns="${d#*:}"
 121                 while [ -n "$ns" ]; do
 122                         newconf="${newconf}${ns%%,*}"
 123                         [ "$ns" = "${ns#*,}" ] && break
 124                         ns="${ns#*,}"
 125                         newconf="${newconf},"
 126                 done
 127                 newconf="${newconf};\n}\n"
 128         done
 129
 130         rm -f "$cf"
 131         remove_markers "$signature" "$signature_end" "$pdnsd_conf" > "$cf"
 132         if [ -n "$newconf" ]; then
 133                 echo "$signature" >> "$cf"
 134                 printf %s "$newconf" >> "$cf"
 135                 echo "$signature_end" >> "$cf"
 136         fi
 137         if change_file "$pdnsd_conf" "$cf"; then
 138                 changed=true
 139         fi
 140 fi
 141
 142 if [ -n "$pdnsd_resolv" ]; then
 143         if [ ! -f "$pdnsd_resolv" ] || \
 144                 [ "$(cat "$pdnsd_resolv")" != "$(printf %s "$newresolv")" ]
 145         then
 146                 changed=true
 147                 printf %s "$newresolv" >"$pdnsd_resolv"
 148         fi
 149 fi
 150
 151 if $changed; then
 152         eval $pdnsd_restart
 153 fi