1 files changed, 42 insertions, 0 deletions

diff --git a/debian/openssh-server.if-up b/debian/openssh-server.if-up
new file mode 100644
index 000000000..915284cc6
--- /dev/null
+++ b/debian/openssh-server.if-up
@@ -0,0 +1,42 @@
+#! /bin/sh
+# Reload the OpenSSH server when an interface comes up, to allow it to start
+# listening on new addresses.
+
+set -e
+
+# Don't bother to restart sshd when lo is configured.
+if [ "$IFACE" = lo ]; then
+        exit 0
+fi
+
+# Only run from ifup.
+if [ "$MODE" != start ]; then
+        exit 0
+fi
+
+# OpenSSH only cares about inet and inet6. Get ye gone, strange people
+# still using ipx.
+if [ "$ADDRFAM" != inet ] && [ "$ADDRFAM" != inet6 ]; then
+        exit 0
+fi
+
+# Is /usr mounted?
+if [ ! -e /usr/sbin/sshd ]; then
+        exit 0
+fi
+
+if [ ! -f /var/run/sshd.pid ] || \
+   [ "$(ps -p "$(cat /var/run/sshd.pid)" -o comm=)" != sshd ]; then
+        exit 0
+fi
+
+# We'd like to use 'reload' here, but it has some problems; see #502444.  On
+# the other hand, repeated restarts of ssh make systemd unhappy
+# (#756547/#757822), so use reload in that case.
+if [ -d /run/systemd/system ]; then
+        systemctl reload --no-block ssh.service >/dev/null 2>&1 || true
+else
+        invoke-rc.d ssh restart >/dev/null 2>&1 || true
+fi
+
+exit 0