roy.marples.name Git - openresolv/blob - libc.in

   1 #!/bin/sh
   2 # Copyright 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 RESOLVCONF="${RESOLVCONF:-resolvconf}"
  30 eval "$(${RESOLVCONF} -v)"
  31
  32 SYSCONFDIR=@SYSCONFDIR@
  33 LIBEXECDIR=@LIBEXECDIR@
  34
  35 # sed may not be available, and this is faster on small files
  36 key_get_value()
  37 {
  38         local key="$1" value= x= line=
  39
  40         shift
  41         if [ $# -eq 0 ]; then
  42                 while read line; do
  43                         case "${line}" in
  44                         "${key}"*) echo "${line##${key}}";;
  45                         esac
  46                 done
  47         else
  48                 for x; do
  49                         while read line; do
  50                                 case "${line}" in
  51                                 "${key}"*) echo "${line##${key}}";;
  52                                 esac
  53                         done < "${x}"
  54                 done
  55         fi
  56 }
  57
  58 # Support original resolvconf configuration layout
  59 # as well as the openresolv config file
  60 if [ -f "${SYSCONFDIR}"/resolvconf.conf ]; then
  61         . "${SYSCONFDIR}"/resolvconf.conf
  62 elif [ -d "${SYSCONFDIR}/resolvconf" ]; then
  63         SYSCONFDIR="${SYSCONFDIR}/resolvconf/resolv.conf.d"
  64         base="${SYSCONFDIR}/resolv.conf.d/base"
  65         if [ -f "${BASE}" ]; then
  66                 name_servers="$(key_get_value "nameserver " "${base}")"
  67                 search_domains="$(key_get_value "search " "${base}")"
  68                 if [ -z "${search_domains}" ]; then
  69                         search_domains="$(key_get_value "domain " "${base}")"
  70                 fi
  71                 resolv_conf_options="$(key_get_value "options " "${base}")"
  72         fi
  73         if [ -f "${SYSCONFDIR}"/resolv.conf.d/head ]; then
  74                 resolv_conf_head="$(cat "${SYSCONFDIR}"/resolv.conf.d/head)"
  75         fi
  76         if [ -f "${SYSCONFDIR}"/resolv.conf.d/tail ]; then
  77                 resolv_conf_tail="$(cat "${SYSCONFDIR}"/resolv.conf.d/tail)"
  78         fi
  79 fi
  80 resolv_conf="${resolv_conf:-/etc/resolv.conf}"
  81
  82 uniqify()
  83 {
  84         local result=
  85         while [ -n "$1" ]; do
  86                 case " ${result} " in
  87                 *" $1 "*);;
  88                 *) result="${result} $1";;
  89 esac
  90 shift
  91 done
  92 echo "${result# *}"
  93 }
  94
  95 newsearch="$(uniqify ${search_domains} ${SEARCH})"
  96 newns="$(uniqify ${name_servers} ${NAMESERVERS})"
  97
  98 # Hold our new resolv.conf in a variable to save on temporary files
  99 newconf="# Generated by resolvconf\n"
 100 if [ -n "${resolv_conf_head}" ]; then
 101         newconf="${newconf}${resolv_conf_head}\n"
 102 fi
 103 [ -n "${newsearch}" ] && newconf="${newconf}search ${newsearch}\n"
 104 for n in ${newns}; do
 105         newconf="${newconf}nameserver ${n}\n"
 106 done
 107
 108 # Now get any configured options
 109 opts="${resolv_conf_options}${resolv_conf_options:+ }"
 110 opts="${opts}$(${RESOLVCONF} -l | key_get_value "options ")"
 111 if [ -n "${opts}" ]; then
 112         newconf="${newconf}options"
 113         for opt in $(uniqify ${opts}); do
 114                 newconf="${newconf} ${opt}"
 115         done
 116         newconf="${newconf}\n"
 117 fi
 118
 119 if [ -n "{resolv_conf_tail}" ]; then
 120         newconf="${newconf}${resolv_conf_tail}\n"
 121 fi
 122
 123 # Check if the file has actually changed or not
 124 if [ -e "${resolv_conf}" ]; then
 125         [ "$(cat "${resolv_conf}")" = "$(printf "${newconf}")" ] && exit 0
 126 fi
 127
 128 # Create our resolv.conf now
 129 (umask 022; printf "${newconf}" > "${resolv_conf}")
 130
 131 resolvconf -s nscd restart
 132 retval=$?
 133
 134 # Notify users of the resolver
 135 for script in "${LIBEXECDIR}"/libc.d/*; do
 136         if [ -f "${script}" -a -x "${script}" ]; then
 137                 RESOLVCONF="${RESOLVCONF}" "${script}" "$@"
 138                 retval=$((${retval} + $?))
 139         fi
 140 done
 141 exit ${retval}