From 258848ace2bcecf1ae6c3b7b433805b18fbd37d0 Mon Sep 17 00:00:00 2001
From: David Oberhollenzer <david.oberhollenzer@tele2.at>
Date: Tue, 17 Jul 2018 18:02:46 +0200
Subject: [PATCH] Add ifdown service

Add a service file and helper script to shut down all network interfaces
during shutdown or reboot.

Signed-off-by: David Oberhollenzer <david.oberhollenzer@tele2.at>
---
 .gitignore             |  1 +
 Makefile.am            |  2 ++
 configure.ac           |  1 +
 scripts/Makemodule.am  |  4 ++--
 scripts/ifdown.sh      | 26 ++++++++++++++++++++++++++
 services/Makemodule.am |  2 +-
 services/ifdown.in     |  7 +++++++
 7 files changed, 40 insertions(+), 3 deletions(-)
 create mode 100644 scripts/ifdown.sh
 create mode 100644 services/ifdown.in

diff --git a/.gitignore b/.gitignore
index 44d1ad5..9bdaf3b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -30,6 +30,7 @@ services/procfs
 services/sysfs
 services/ifrename
 services/ifcfg
+services/ifdown
 
 scripts/devfs.sh
 scripts/ifrename.sh
diff --git a/Makefile.am b/Makefile.am
index bdee5cb..ba51643 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -37,12 +37,14 @@ install-data-local:
 	$(LN_S) $(TEMPLATEDIR)/vfs $(DESTDIR)$(SVCDIR)/vfs
 	$(LN_S) $(TEMPLATEDIR)/shutdown $(DESTDIR)$(SVCDIR)/shutdown
 	$(LN_S) $(TEMPLATEDIR)/reboot $(DESTDIR)$(SVCDIR)/reboot
+	$(LN_S) $(TEMPLATEDIR)/ifdown $(DESTDIR)$(SVCDIR)/ifdown@shutdown
 	$(LN_S) $(TEMPLATEDIR)/sync $(DESTDIR)$(SVCDIR)/sync@shutdown
 	$(LN_S) $(TEMPLATEDIR)/sigkill $(DESTDIR)$(SVCDIR)/sigkill@shutdown
 	$(LN_S) $(TEMPLATEDIR)/sigterm $(DESTDIR)$(SVCDIR)/sigterm@shutdown
 	$(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)/ifdown $(DESTDIR)$(SVCDIR)/ifdown@reboot
 	$(LN_S) $(TEMPLATEDIR)/ifcfg $(DESTDIR)$(SVCDIR)/ifcfg
 if USYSLOGD
 	$(LN_S) $(TEMPLATEDIR)/usyslogd $(DESTDIR)$(SVCDIR)/usyslogd
diff --git a/configure.ac b/configure.ac
index 6bdb096..77b8abd 100644
--- a/configure.ac
+++ b/configure.ac
@@ -64,6 +64,7 @@ AC_CONFIG_FILES([services/devfs])
 AC_CONFIG_FILES([services/procfs])
 AC_CONFIG_FILES([services/ifrename])
 AC_CONFIG_FILES([services/ifcfg])
+AC_CONFIG_FILES([services/ifdown])
 AC_CONFIG_FILES([scripts/devfs.sh])
 AC_CONFIG_FILES([scripts/ifrename.sh])
 AC_CONFIG_FILES([scripts/ifcfg.sh])
diff --git a/scripts/Makemodule.am b/scripts/Makemodule.am
index fa0f917..c0e7a82 100644
--- a/scripts/Makemodule.am
+++ b/scripts/Makemodule.am
@@ -1,4 +1,4 @@
 helper_SCRIPTS += scripts/devfs.sh scripts/trymount.sh scripts/ifrename.sh
-helper_SCRIPTS += scripts/ifcfg.sh
+helper_SCRIPTS += scripts/ifcfg.sh scripts/ifdown.sh
 
-EXTRA_DIST += scripts/trymount.sh
+EXTRA_DIST += scripts/trymount.sh scripts/ifdown.sh
diff --git a/scripts/ifdown.sh b/scripts/ifdown.sh
new file mode 100644
index 0000000..2e2b30e
--- /dev/null
+++ b/scripts/ifdown.sh
@@ -0,0 +1,26 @@
+#!/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/>.
+#
+for IFPATH in /sys/class/net/*; do
+	[ "$IFPATH" == "/sys/class/net/lo" ] && continue
+
+	IF=`basename $IFPATH`
+
+	ip link set dev "$IF" down
+done
diff --git a/services/Makemodule.am b/services/Makemodule.am
index e9e6ac7..75ab76d 100644
--- a/services/Makemodule.am
+++ b/services/Makemodule.am
@@ -6,7 +6,7 @@ init_DATA += services/sigterm services/sync services/devfs
 init_DATA += services/sysfs services/procfs services/tmpfs
 init_DATA += services/vfs services/ifrename services/ifcfg
 init_DATA += services/dhcpcd services/dhcpcdmaster services/unbound
-init_DATA += services/dnsmasq
+init_DATA += services/dnsmasq services/ifdown
 
 if USYSLOGD
 init_DATA += services/usyslogd
diff --git a/services/ifdown.in b/services/ifdown.in
new file mode 100644
index 0000000..1310098
--- /dev/null
+++ b/services/ifdown.in
@@ -0,0 +1,7 @@
+description "stop all network interfaces"
+type wait
+target %0
+after sigkill sigterm
+before sync
+
+exec "@SCRIPTDIR@/ifdown.sh"
\ No newline at end of file