Add service and helper script for static network configuration

After interface renaming is done, perform the following actions:
 - Configure each interface for which we have a configuration file
 - Configuration file contains lines that we pass directly to iproute2
 - Configure static routing in a similar fashion
 - Set the configured interfaces up

Signed-off-by: David Oberhollenzer <david.oberhollenzer@tele2.at>

2 files changed, 90 insertions, 0 deletions

diff --git a/scripts/Makemodule.am b/scripts/Makemodule.am
index 5759ff0..fa0f917 100644
--- a/scripts/Makemodule.am
+++ b/scripts/Makemodule.am
@@ -1,3 +1,4 @@
 helper_SCRIPTS += scripts/devfs.sh scripts/trymount.sh scripts/ifrename.sh
+helper_SCRIPTS += scripts/ifcfg.sh
 
 EXTRA_DIST += scripts/trymount.sh
diff --git a/scripts/ifcfg.sh.in b/scripts/ifcfg.sh.in
new file mode 100755
index 0000000..8f684e7
--- /dev/null
+++ b/scripts/ifcfg.sh.in
@@ -0,0 +1,89 @@
+#!/bin/sh
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
+#
+# Copyright (C) 2018 - David Oberhollenzer
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+#
+CFGPATH="@ETCPATH@/netcfg"
+
+[ -d "$CFGPATH" ] || exit 0
+
+# configure interfaces
+for IFPATH in /sys/class/net/*; do
+	[ "$IFPATH" == "/sys/class/net/lo" ] && continue
+
+	IF=`basename $IFPATH`
+	CFGFILE="$CFGPATH/$IF"
+
+	[ -f "$CFGFILE" ] || continue
+
+	ip link set dev "$IF" down
+
+	while read LINE;
+	do
+		trimmed=`echo -- $LINE`
+		[ ! -z "$trimmed" ] || continue
+		set $trimmed
+
+		case "$1" in
+		address|addr|ip|ip6|ipv6)
+			shift
+			ip address add $@ dev "$IF"
+			;;
+		arp|multicast|mtu)
+			ip link set dev "$IF" $@
+			;;
+		offload)
+			shift
+			ethtool -K "$IF" $@
+			;;
+		*)
+			;;
+		esac
+	done < "$CFGFILE"
+done
+
+# configure static routs
+if [ -f "$CFGPATH/routes" ]; then
+	while read LINE;
+	do
+		trimmed=`echo -- $LINE`
+		[ ! -z "$trimmed" ] || continue
+		set $trimmed
+
+		case "$1" in
+		route)
+			shift
+			ip route add $@
+			;;
+		rule)
+			shift
+			ip rule add $@
+			;;
+		*)
+			;;
+		esac
+	done < "$CFGFILE"
+fi
+
+# activate interfaces
+for IFPATH in /sys/class/net/*; do
+	[ "$IFPATH" == "/sys/class/net/lo" ] && continue
+
+	IF=`basename $IFPATH`
+
+	[ ! -f "$CFGPATH/$IF" ] || ip link set dev "$IF" up
+done