contrib/openresolv/libc.in

   1 #!/bin/sh
   2 # Copyright (c) 2007-2009 Roy Marples
   3 # All rights reserved
   4
   5 # libc 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 SYSCONFDIR=@SYSCONFDIR@
  30 LIBEXECDIR=@LIBEXECDIR@
  31 VARDIR=@VARDIR@
  32 IFACEDIR="$VARDIR/interfaces"
  33 NL="
  34 "
  35
  36 # sed may not be available, and this is faster on small files
  37 key_get_value()
  38 {
  39         local key="$1" value= x= line=
  40
  41         shift
  42         if [ $# -eq 0 ]; then
  43                 while read line; do
  44                         case "$line" in
  45                         "$key"*) echo "${line##$key}";;
  46                         esac
  47                 done
  48         else
  49                 for x; do
  50                         while read line; do
  51                                 case "$line" in
  52                                 "$key"*) echo "${line##$key}";;
  53                                 esac
  54                         done < "$x"
  55                 done
  56         fi
  57 }
  58
  59 # Support original resolvconf configuration layout
  60 # as well as the openresolv config file
  61 if [ -f "$SYSCONFDIR"/resolvconf.conf ]; then
  62         . "$SYSCONFDIR"/resolvconf.conf
  63 elif [ -d "$SYSCONFDIR"/resolvconf ]; then
  64         SYSCONFDIR="$SYSCONFDIR/resolvconf/resolv.conf.d"
  65         base="$SYSCONFDIR/resolv.conf.d/base"
  66         if [ -f "$base" ]; then
  67                 name_servers="$(key_get_value "nameserver " "$base")"
  68                 search_domains="$(key_get_value "search " "$base")"
  69                 if [ -z "$search_domains" ]; then
  70                         search_domains="$(key_get_value "domain " "$base")"
  71                 fi
  72                 resolv_conf_options="$(key_get_value "options " "$base")"
  73         fi
  74         if [ -f "$SYSCONFDIR"/resolv.conf.d/head ]; then
  75                 resolv_conf_head="$(cat "${SYSCONFDIR}"/resolv.conf.d/head)"
  76         fi
  77         if [ -f "$SYSCONFDIR"/resolv.conf.d/tail ]; then
  78                 resolv_conf_tail="$(cat "$SYSCONFDIR"/resolv.conf.d/tail)"
  79         fi
  80 fi
  81 : ${resolv_conf:=/etc/resolv.conf}
  82 : ${libc_service:=nscd}
  83 : ${libc_restart:=@RESTARTCMD ${libc_service}@}
  84 : ${list_resolv:=@PREFIX@/sbin/resolvconf -l}
  85 if [ "${resolv_conf_head-x}" = x -a -f "$SYSCONFDIR"/resolv.conf.head ]; then
  86         resolv_conf_head="$(cat "${SYSCONFDIR}"/resolv.conf.head)"
  87 fi
  88 if [ "${resolv_conf_tail-x}" = x -a -f "$SYSCONFDIR"/resolv.conf.tail ]; then
  89         resolv_conf_tail="$(cat "$SYSCONFDIR"/resolv.conf.tail)"
  90 fi
  91
  92 uniqify()
  93 {
  94         local result=
  95         while [ -n "$1" ]; do
  96                 case " $result " in
  97                 *" $1 "*);;
  98                 *) result="$result $1";;
  99                 esac
 100                 shift
 101         done
 102         echo "${result# *}"
 103 }
 104
 105 case "${resolv_conf_passthrough:-NO}" in
 106 [Yy][Ee][Ss]|[Tt][Rr][Uu][Ee]|[Oo][Nn]|1)
 107         newest=
 108         for conf in "$IFACEDIR"/*; do
 109                 if [ -z "$newest" -o "$conf" -nt "$newest" ]; then
 110                         newest="$conf"
 111                 fi
 112         done
 113         [ -z "$newest" ] && exit 0
 114         newconf="$(cat "$newest")$NL"
 115         ;;
 116 *)
 117         [ -z "$RESOLVCONF" ] && eval "$(@PREFIX@/sbin/resolvconf -v)"
 118         newsearch="$(uniqify $search_domains $SEARCH $search_domains_append)"
 119         NS="$LOCALNAMESERVERS $NAMESERVERS"
 120         newns="$(uniqify $name_servers $NS $name_servers_append)"
 121
 122         # Hold our new resolv.conf in a variable to save on temporary files
 123         newconf="# Generated by resolvconf$NL"
 124         if [ -n "$resolv_conf_head" ]; then
 125                 newconf="$newconf$resolv_conf_head$NL"
 126         fi
 127         [ -n "$newsearch" ] && newconf="${newconf}search $newsearch$NL"
 128         for n in $newns; do
 129                 newconf="${newconf}nameserver $n$NL"
 130         done
 131
 132         # Now get any configured options
 133         opts="$resolv_conf_options${resolv_conf_options:+ }"
 134         opts="$opts$($list_resolv | key_get_value "options ")"
 135         if [ -n "$opts" ]; then
 136                 newconf="${newconf}options"
 137                 for opt in $(uniqify $opts); do
 138                         newconf="${newconf} $opt"
 139                 done
 140                 newconf="$newconf$NL"
 141         fi
 142
 143         if [ -n "$resolv_conf_tail" ]; then
 144                 newconf="$newconf$resolv_conf_tail$NL"
 145         fi
 146         ;;
 147 esac
 148
 149 # Check if the file has actually changed or not
 150 if [ -e "$resolv_conf" ]; then
 151         [ "$(cat "$resolv_conf")" = "$(printf %s "$newconf")" ] && exit 0
 152 fi
 153
 154 # Create our resolv.conf now
 155 (umask 022; echo "$newconf" >"$resolv_conf")
 156 eval $libc_restart
 157
 158 retval=0
 159 # Notify users of the resolver
 160 for script in "$LIBEXECDIR"/libc.d/*; do
 161         if [ -f "$script" ]; then
 162                 if [ -x "$script" ]; then
 163                         "$script" "$@"
 164                 else
 165                         (. "$script" "$@")
 166                 fi
 167                 retval=$(($retval + $?))
 168         fi
 169 done
 170 exit $retval