Файловый менеджер - Редактировать - /usr/sbin/resolvconf
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#!/bin/sh # # This file is part of the resolvconf package. # set -e echo_usage() { echo "Usage: resolvconf (-d IFACE|-a IFACE|-u|--enable-updates|--disable-updates|--updates-are-enabled)" ; } PATH=/sbin:/bin:/usr/sbin:/usr/bin MYNAME="${0##*/}" RUN_DIR=/run/resolvconf ENABLE_UPDATES_FLAGFILE="${RUN_DIR}/enable-updates" POSTPONED_UPDATE_FLAGFILE="${RUN_DIR}/postponed-update" report_err() { echo "${MYNAME}: Error: $*" >&2 ; } # Check arguments CMD="$1" case "$CMD" in -a|-d) IFACE="$2" if [ ! "$IFACE" ] ; then report_err "No interface name specified" echo_usage >&2 exit 1 fi report_iface_err() { report_err "$* not allowed in interface record name" } case "$IFACE" in */*) report_iface_err "Slash" ; exit 1 ;; *" "*) report_iface_err "Space" ; exit 1 ;; .*) report_iface_err "Initial dot" ; exit 1 ;; -*) report_iface_err "Initial hyphen" ; exit 1 ;; ~*) report_iface_err "Initial tilde" ; exit 1 ;; esac ;; -u|--enable-updates|--disable-updates|--updates-are-enabled) if [ "$2" ] ; then report_err "The $CMD option does not take an argument" echo_usage >&2 exit 1 fi ;; *) report_err "Command not recognized" echo_usage >&2 exit 99 ;; esac [ -d "${RUN_DIR}/interface" ] || { mkdir -p "${RUN_DIR}/interface" ; } [ -d "${RUN_DIR}/interface" ] || { report_err "${RUN_DIR}/interface either does not exist or is not a directory" ; exit 1 ; } cd "${RUN_DIR}/interface" { # Make sure that we do not end up with a broken resolv.conf if resolvconf # is invoked in parallel. LOCK_WAIT_S=10 flock -w $LOCK_WAIT_S 9 || { report_err "Run lock held by another process for longer than $LOCK_WAIT_S seconds"; exit 1; } update_and_exit() { rm -f "$POSTPONED_UPDATE_FLAGFILE" exec run-parts ${1:+--arg="$1"} ${2:+--arg="$2"} /etc/resolvconf/update.d } # Handle commands that don't require normalized_stdin() case "$CMD" in -d) if [ ! -e "$IFACE" ] ; then exit 0 fi if [ ! -s "$IFACE" ] ; then rm -f "$IFACE" exit 0 fi rm -f "$IFACE" if [ -e "$ENABLE_UPDATES_FLAGFILE" ] ; then update_and_exit -d "$IFACE" else : >| "$POSTPONED_UPDATE_FLAGFILE" exit 0 fi ;; -u) if [ -e "$ENABLE_UPDATES_FLAGFILE" ] ; then update_and_exit -u else : >| "$POSTPONED_UPDATE_FLAGFILE" exit 0 fi ;; --enable-updates) : >| "$ENABLE_UPDATES_FLAGFILE" || exit 1 if [ -e "$POSTPONED_UPDATE_FLAGFILE" ] ; then (update_and_exit -u) || : fi exit 0 ;; --disable-updates) rm -f "$POSTPONED_UPDATE_FLAGFILE" || : rm -f "$ENABLE_UPDATES_FLAGFILE" || exit 1 exit 0 ;; --updates-are-enabled) if [ -e "$ENABLE_UPDATES_FLAGFILE" ] ; then exit 0 else exit 1 fi ;; esac # # The following function must EXACTLY the same in the resolvconf # and test-normalization scripts. And the test must pass! # ### BEGIN FUNCTION TO COPY TO THE test-normalization SCRIPT ### # # Echo stdin with: # comments removed; # initial and terminal whitespace removed; # whitespace strings replaced by single blanks; # leading zeroes removed from nameserver address fields; # first set of zero fields in an IPv6 address collapsed to '::'; # empty lines removed. normalized_stdin() { sed \ -e 's/#.*$//' \ -e 's/[[:blank:]]\+$//' \ -e 's/^[[:blank:]]\+//' \ -e 's/[[:blank:]]\+/ /g' \ -e '/^nameserver/!b ENDOFCYCLE' \ -e 's/$/ /' \ -e 's/\([:. ]\)0\+/\10/g' \ -e 's/\([:. ]\)0\([123456789abcdefABCDEF][[:xdigit:]]*\)/\1\2/g' \ -e '/::/b ENDOFCYCLE; s/ \(0[: ]\)\+/ ::/' \ -e '/::/b ENDOFCYCLE; s/:\(0[: ]\)\+/::/' \ -e ': ENDOFCYCLE' \ - | \ sed \ -e 's/[[:blank:]]\+$//' \ -e '/^$/d' } ### END FUNCTION TO COPY TO THE test-normalization SCRIPT ### case "$CMD" in -a) OLD_CONTENT="" [ -f "$IFACE" ] && OLD_CONTENT="$(cat "$IFACE")" NEW_CONTENT="$(normalized_stdin)" # Proceed only if content has changed. The test here can't # eliminate 100% of redundant invocations of update scripts # because we don't do any locking; however it certainly does # eliminate most of them. if [ "$NEW_CONTENT" = "$OLD_CONTENT" ] ; then exit 0 fi IFACE_TMPFILE="${IFACE}_new.$$" cleanup() { rm -f "$IFACE_TMPFILE" ; } trap cleanup EXIT echo "$NEW_CONTENT" > "$IFACE_TMPFILE" mv -f "$IFACE_TMPFILE" "$IFACE" if [ -e "$ENABLE_UPDATES_FLAGFILE" ] ; then update_and_exit -a "$IFACE" else : >| "$POSTPONED_UPDATE_FLAGFILE" exit 0 fi ;; esac # Don't reach here exit 99 } 9>"${RUN_DIR}/run-lock"
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