diff options
Diffstat (limited to 'sysconfig/network-scripts/ifup-post')
| -rwxr-xr-x | sysconfig/network-scripts/ifup-post | 141 |
1 files changed, 84 insertions, 57 deletions
diff --git a/sysconfig/network-scripts/ifup-post b/sysconfig/network-scripts/ifup-post index 41956e7e..bcca632e 100755 --- a/sysconfig/network-scripts/ifup-post +++ b/sysconfig/network-scripts/ifup-post @@ -28,67 +28,94 @@ if ! is_true "$NOROUTESET"; then fi -if ! is_false "$PEERDNS" || [ -n "$RESOLV_MODS" ] && ! is_false "$RESOLV_MODS"; then - [ -n "$MS_DNS1" ] && DNS1=$MS_DNS1 - [ -n "$MS_DNS2" ] && DNS2=$MS_DNS2 - - if [ -z "$DNS1" -a -n "$DNS2" ]; then - DNS1=$DNS2 - DNS2= +if ! is_false "${PEERDNS}" || ! is_false "${RESOLV_MODS}"; then + # Obtain the DNS entries when using PPP if necessary: + [ -n "${MS_DNS1}" ] && DNS1="${MS_DNS1}" + [ -n "${MS_DNS2}" ] && DNS2="${MS_DNS2}" + + # Remove duplicate DNS entries and shift them, if necessary: + update_DNS_entries + + # Determine what regexp we should use (for testing below): + if [ -n "${DNS3}" ]; then + grep_regexp="[^#]?nameserver[[:space:]]+${DNS1}[^#]?nameserver[[:space:]]+${DNS2}[^#]?nameserver[[:space:]]+${DNS3}" + elif [ -n "${DNS2}" ]; then + grep_regexp="[^#]?nameserver[[:space:]]+${DNS1}[^#]?nameserver[[:space:]]+${DNS2}" + elif [ -n "${DNS1}" ]; then + grep_regexp="[^#]?nameserver[[:space:]]+${DNS1}" + else + # No DNS entries used at all ->> match everything. + grep_regexp=".*" fi - if ( [ -n "$DNS1" ] && ! grep -q "^nameserver $DNS1" /etc/resolv.conf ) || - ( [ -n "$DNS2" ] && ! grep -q "^nameserver $DNS2" /etc/resolv.conf ) && - tr=$(mktemp /tmp/XXXXXX) ; then - current_replacement="$DNS1" - next_replacement="$DNS2" - search= - (cat /etc/resolv.conf ; echo EOF ; echo EOF) | while read answer ; do - case $answer in - nameserver*|EOF) - if [ -n "$current_replacement" ] ; then - echo "nameserver $current_replacement" >> $tr - if [ -n "$next_replacement" ] ; then - current_replacement="$next_replacement" - next_replacement= - else - current_replacement= - fi - else - if [ "$answer" != EOF ] ; then - echo "$answer" >> $tr - fi - fi - ;; - domain*|search*) - if [ -n "$DOMAIN" ]; then - echo "$answer" | while read key value ; do - search="$search $value" - done - else - echo "$answer" >> $tr - fi - ;; - *) - echo "$answer" >> $tr - ;; - esac - done - if [ -n "$DOMAIN" ]; then - echo "search $DOMAIN $search" >> $tr + # Test if the search field needs updating, or + # if the nameserver entries order should be updated: + if [ -n "${DOMAIN}" ] && ! grep -q "^search.*${DOMAIN}.*$" /etc/resolv.conf || + ! tr --delete '\n' < /etc/resolv.conf | grep -E -q "${grep_regexp}"; then + + if tmp_file=$(mktemp); then + search_str='' + + while read line; do + case ${line} in + + # Skip nameserver entries when at least one DNS option was given + # (at this stage we know that we have to update all the nameserver + # enries anyway -- see below), or copy them if we are changing just + # the 'search' field in /etc/resolv.conf: + nameserver*) + if [[ "${grep_regexp}" != ".*" ]]; then + continue + else + echo "${line}" >> "${tmp_file}" + fi + ;; + + domain* | search*) + if [ -n "${DOMAIN}" ]; then + read search value < <(echo ${line}) + search_str+=" ${value}" + else + echo "${line}" >> "${tmp_file}" + fi + ;; + + # Keep the rest of the /etc/resolv.conf as it was: + *) + echo "${line}" >> "${tmp_file}" + ;; + esac + done < /etc/resolv.conf + + # Insert the domain into 'search' field: + if [ -n "${DOMAIN}" ]; then + echo "search ${DOMAIN}${search_str}" >> "${tmp_file}" + fi + + # Add the requested nameserver entries: + [ -n "${DNS1}" ] && echo "nameserver ${DNS1}" >> "${tmp_file}" + [ -n "${DNS2}" ] && echo "nameserver ${DNS2}" >> "${tmp_file}" + [ -n "${DNS3}" ] && echo "nameserver ${DNS3}" >> "${tmp_file}" + + # Backup resolv.conf only if it doesn't exist already: + ! [ -f /etc/resolv.conf.save ] && cp -af /etc/resolv.conf /etc/resolv.conf.save + + # Maintain permissions, but set umask in case it doesn't exist: + umask_old=$(umask) + umask 022 + + # Update the resolv.conf: + change_resolv_conf "${tmp_file}" + + rm -f "${tmp_file}" + umask ${umask_old} + unset tmp_file search_str umask_old + else + net_log $"/etc/resolv.conf was not updated: failed to create temporary file" 'err' 'ifup-post' fi - - # backup resolv.conf - cp -af /etc/resolv.conf /etc/resolv.conf.save - - # maintain permissions - # but set umask in case it doesn't exist! - oldumask=$(umask) - umask 022 - change_resolv_conf $tr - rm -f $tr - umask $oldumask fi + + unset grep_regexp fi # don't set hostname on ppp/slip connections |