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