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>

.gitignore

@@ -27,8 +27,10 @@ services/devfs
 services/procfs
 services/sysfs
 services/ifrename
+services/ifcfg
 
 scripts/devfs.sh
 scripts/ifrename.sh
+scripts/ifcfg.sh
 
 etc/initd.env

Makefile.am

@@ -38,3 +38,4 @@ install-data-local:
 	$(LN_S) $(TEMPLATEDIR)/sync $(DESTDIR)$(SVCDIR)/sync@reboot
 	$(LN_S) $(TEMPLATEDIR)/sigkill $(DESTDIR)$(SVCDIR)/sigkill@reboot
 	$(LN_S) $(TEMPLATEDIR)/sigterm $(DESTDIR)$(SVCDIR)/sigterm@reboot
+	$(LN_S) $(TEMPLATEDIR)/ifcfg $(DESTDIR)$(SVCDIR)/ifcfg

configure.ac

@@ -53,8 +53,10 @@ AC_CONFIG_FILES([services/sysfs])
 AC_CONFIG_FILES([services/devfs])
 AC_CONFIG_FILES([services/procfs])
 AC_CONFIG_FILES([services/ifrename])
+AC_CONFIG_FILES([services/ifcfg])
 AC_CONFIG_FILES([scripts/devfs.sh])
 AC_CONFIG_FILES([scripts/ifrename.sh])
+AC_CONFIG_FILES([scripts/ifcfg.sh])
 AC_CONFIG_FILES([etc/initd.env])
 
 AC_OUTPUT([Makefile])

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

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

services/Makemodule.am

@@ -4,7 +4,7 @@ init_DATA += services/sysctl services/hwclock services/sysinit
 init_DATA += services/reboot services/shutdown services/sigkill
 init_DATA += services/sigterm services/sync services/devfs
 init_DATA += services/sysfs services/procfs services/tmpfs
-init_DATA += services/vfs services/ifrename
+init_DATA += services/vfs services/ifrename services/ifcfg
 
 EXTRA_DIST += services/sysinit services/vfs services/agetty services/hostname
 EXTRA_DIST += services/hwclock services/loopback services/reboot

services/ifcfg.in

@@ -0,0 +1,6 @@
+description "static network configuration"
+type wait
+target boot
+after sysinit ifrename
+
+exec "@SCRIPTDIR@/ifcfg.sh"