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#!/bin/sh		#!/bin/sh
# Copyright (c) 2007-2019 Roy Marples		# Copyright (c) 2007-2025 Roy Marples
# All rights reserved		# All rights reserved

# libc subscriber for resolvconf		# libc subscriber for resolvconf

# Redistribution and use in source and binary forms, with or without		# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions		# modification, are permitted provided that the following conditions
# are met:		# are met:
# * Redistributions of source code must retain the above copyright		# * Redistributions of source code must retain the above copyright
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY		# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT		# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE		# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.		# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

SYSCONFDIR=@SYSCONFDIR@		SYSCONFDIR=@SYSCONFDIR@
LIBEXECDIR=@LIBEXECDIR@		LIBEXECDIR=@LIBEXECDIR@
VARDIR=@VARDIR@		VARDIR=@VARDIR@
IFACEDIR="$VARDIR/interfaces"		KEYDIR="$VARDIR/keys"
		# Compat
		if [ ! -d "$KEYDIR" ] && [ -d "$VARDIR/interfaces" ]; then
		KEYDIR="$VARDIR/interfaces"
		fi

		CMD="$1"
		KEY="$2"

NL="		NL="
"		"

		warn()
		{
		echo "${0##/}: $" >&2
		}

# sed may not be available, and this is faster on small files		# sed may not be available, and this is faster on small files
key_get_value()		key_get_value()
{		{
key="$1"		key="$1"
shift		shift

if [ $# -eq 0 ]; then		if [ $# -eq 0 ]; then
while read -r line; do		while read -r line; do
▲ Show 20 Lines • Show All 45 Lines • ▼ Show 20 Lines	elif [ -d "$SYSCONFDIR"/resolvconf ]; then
if [ -f "$SYSCONFDIR"/resolv.conf.d/head ]; then		if [ -f "$SYSCONFDIR"/resolv.conf.d/head ]; then
resolv_conf_head="$(cat "${SYSCONFDIR}"/resolv.conf.d/head)"		resolv_conf_head="$(cat "${SYSCONFDIR}"/resolv.conf.d/head)"
fi		fi
if [ -f "$SYSCONFDIR"/resolv.conf.d/tail ]; then		if [ -f "$SYSCONFDIR"/resolv.conf.d/tail ]; then
resolv_conf_tail="$(cat "$SYSCONFDIR"/resolv.conf.d/tail)"		resolv_conf_tail="$(cat "$SYSCONFDIR"/resolv.conf.d/tail)"
fi		fi
fi		fi
: ${resolv_conf:=/etc/resolv.conf}		: ${resolv_conf:=/etc/resolv.conf}
		if [ "$resolv_conf" = "/dev/null" ]; then
		exit 0
		fi
		: ${resolv_conf_tmp:="$resolv_conf.$$.openresolv"}
: ${libc_service:=nscd}		: ${libc_service:=nscd}
: ${list_resolv:=@SBINDIR@/resolvconf -l}		: ${list_resolv:=@SBINDIR@/resolvconf -L}
if [ "${resolv_conf_head-x}" = x ] && [ -f "$SYSCONFDIR"/resolv.conf.head ]		if [ "${resolv_conf_head-x}" = x ] && [ -f "$SYSCONFDIR"/resolv.conf.head ]
then		then
resolv_conf_head="$(cat "${SYSCONFDIR}"/resolv.conf.head)"		resolv_conf_head="$(cat "${SYSCONFDIR}"/resolv.conf.head)"
fi		fi
if [ "${resolv_conf_tail-x}" = x ] && [ -f "$SYSCONFDIR"/resolv.conf.tail ]		if [ "${resolv_conf_tail-x}" = x ] && [ -f "$SYSCONFDIR"/resolv.conf.tail ]
then		then
resolv_conf_tail="$(cat "$SYSCONFDIR"/resolv.conf.tail)"		resolv_conf_tail="$(cat "$SYSCONFDIR"/resolv.conf.tail)"
fi		fi

backup=true
signature="# Generated by resolvconf"		signature="# Generated by resolvconf"

uniqify()		uniqify()
{		{
result=		result=
while [ -n "$1" ]; do		while [ -n "$1" ]; do
case " $result " in		case " $result " in
" $1 ");;		" $1 ");;
*) result="$result $1";;		*) result="$result $1";;
esac		esac
shift		shift
done		done
echo "${result# *}"		echo "${result# *}"
}		}

case "${resolv_conf_passthrough:-NO}" in		case "${resolv_conf_passthrough:-NO}" in
[Yy][Ee][Ss]\|[Tt][Rr][Uu][Ee]\|[Oo][Nn]\|1)		[Yy][Ee][Ss]\|[Tt][Rr][Uu][Ee]\|[Oo][Nn]\|1)
backup=false
newest=		newest=
for conf in "$IFACEDIR"/*; do		for conf in "$KEYDIR"/*; do
if [ -z "$newest" ] \|\| [ "$conf" -nt "$newest" ]; then		if [ -z "$newest" ] \|\| [ "$conf" -nt "$newest" ]; then
newest="$conf"		newest="$conf"
fi		fi
done		done
[ -z "$newest" ] && exit 0		[ -z "$newest" ] && exit 0
newconf="$(cat "$newest")$NL"		newconf="$signature$NL$(cat "$newest")$NL"
;;		;;
/dev/null\|[Nn][Uu][Ll][Ll])		/dev/null\|[Nn][Uu][Ll][Ll])
: ${resolv_conf_local_only:=NO}		: ${resolv_conf_local_only:=NO}
if [ "$local_nameservers" = "127.* 0.0.0.0 255.255.255.255 ::1" ]; then		if [ "$local_nameservers" = "127.* 0.0.0.0 255.255.255.255 ::1" ]; then
local_nameservers=		local_nameservers=
fi		fi
# Need to overwrite our variables.		# Need to overwrite our variables.
eval "$(@SBINDIR@/resolvconf -V)"		eval "$(@SBINDIR@/resolvconf -V)"
▲ Show 20 Lines • Show All 59 Lines • ▼ Show 20 Lines	*)
if [ -n "$resolv_conf_tail" ]; then		if [ -n "$resolv_conf_tail" ]; then
newconf="$newconf$resolv_conf_tail$NL"		newconf="$newconf$resolv_conf_tail$NL"
fi		fi
;;		;;
esac		esac

# Check if the file has actually changed or not		# Check if the file has actually changed or not
if [ -e "$resolv_conf" ]; then		if [ -e "$resolv_conf" ]; then
[ "$(cat "$resolv_conf")" = "$(printf %s "$newconf")" ] && exit 0		if [ "$CMD" != u ] && \
		[ "$(cat "$resolv_conf")" = "$(printf %s "$newconf")" ]
		then
		exit 0
fi		fi

# Change is good.
# If the old file does not have our signature, back it up.
# If the new file just has our signature, restore the backup.
if $backup; then
if [ "$newconf" = "$signature$NL" ]; then
if [ -e "$resolv_conf.bak" ]; then
newconf="$(cat "$resolv_conf.bak")$NL"
fi
elif [ -e "$resolv_conf" ]; then
read line <"$resolv_conf"		read line <"$resolv_conf"
if [ "$line" != "$signature" ]; then		if [ "$line" != "$signature" ]; then
		if [ "$CMD" != u ]; then
		warn "signature mismatch: $resolv_conf"
		warn "run \`resolvconf -u\` to update"
		exit 1
		fi
cp "$resolv_conf" "$resolv_conf.bak"		cp "$resolv_conf" "$resolv_conf.bak"
fi		fi
fi		fi
fi

		# There are pros and cons for writing directly to resolv.conf
		# instead of a temporary file and then moving it over.
		# The default is to write to resolv.conf as it has the least
		# issues and has been the long standing default behaviour.
		# resolv.conf could also be bind mounted for network namespaces
		# so we cannot move in this instance.
		case "${resolv_conf_mv:-NO}" in
		[Yy][Ee][Ss]\|[Tt][Rr][Uu][Ee]\|[Oo][Nn]\|1)
		# Protect against symlink attack, ensure new file does not exist
		rm -f "$resolv_conf_tmp"
		# Keep original file owner, group and mode
		[ -r "$resolv_conf" ] && cp -p "$resolv_conf" "$resolv_conf_tmp"
# Create our resolv.conf now		# Create our resolv.conf now
		if (umask 022; printf %s "$newconf" >"$resolv_conf_tmp"); then
		mv "$resolv_conf_tmp" "$resolv_conf"
		fi
		;;
		*)
(umask 022; printf %s "$newconf" >"$resolv_conf")		(umask 022; printf %s "$newconf" >"$resolv_conf")
		;;
		esac

if [ -n "$libc_restart" ]; then		if [ -n "$libc_restart" ]; then
eval $libc_restart		eval $libc_restart
elif [ -n "$RESTARTCMD" ]; then		elif [ -n "$RESTARTCMD" ]; then
set -- ${libc_service}		set -- ${libc_service}
eval "$RESTARTCMD"		eval "$RESTARTCMD"
else		else
@SBINDIR@/resolvconf -r ${libc_service}		@SBINDIR@/resolvconf -r ${libc_service}
fi		fi
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