From 65552f3d26db9b2bcc0d131ddf69985670436f81 Mon Sep 17 00:00:00 2001
From: David Runge <dave@sleepmap.de>
Date: Fri, 24 Apr 2015 23:51:33 +0200
Subject: autotunnel: Adding example config, systemd service file and script
 for autossh managed SSH tunnel to predefined host

---
 config/autotunnel/example.conf |  9 +++++++++
 scripts/autotunnel             | 21 +++++++++++++++++++++
 system/autotunnel@.service     | 11 +++++++++++
 3 files changed, 41 insertions(+)
 create mode 100644 config/autotunnel/example.conf
 create mode 100755 scripts/autotunnel
 create mode 100644 system/autotunnel@.service

diff --git a/config/autotunnel/example.conf b/config/autotunnel/example.conf
new file mode 100644
index 0000000..3a348b4
--- /dev/null
+++ b/config/autotunnel/example.conf
@@ -0,0 +1,9 @@
+# Configuration file for autotunnel
+
+# Define a host to connect to
+# Must be resolvable or better even set up in /root/.ssh/config
+HOST=<hostname>
+
+# Define a tun device number to use
+# Make sure the same device is not used elsewhere on localhost and the machine to connect to!
+TUN_DEVICE=<a number>
diff --git a/scripts/autotunnel b/scripts/autotunnel
new file mode 100755
index 0000000..230940d
--- /dev/null
+++ b/scripts/autotunnel
@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+
+if [ -z "$SERVER_ALIVE_INTERVAL" ];then
+  SERVER_ALIVE_INTERVAL=45
+fi
+
+if [ -z "$SERVER_ALIVE_COUNT_MAX" ];then
+  SERVER_ALIVE_INTERVAL=2
+fi
+
+if [ -z "$MONITORING_PORT" ];then
+  MONITORING_PORT=0
+fi
+
+/usr/bin/autossh -M "$MONITORING_PORT" \
+  -NCTv \
+  -o ServerAliveInterval="$SERVER_ALIVE_INTERVAL" \
+  -o ServerAliveCountMax="$SERVER_ALIVE_COUNT_MAX" \
+  -o TCPKeepAlive=yes \
+  -w $TUN_DEVICE:$TUN_DEVICE \
+  $HOST
diff --git a/system/autotunnel@.service b/system/autotunnel@.service
new file mode 100644
index 0000000..b128cac
--- /dev/null
+++ b/system/autotunnel@.service
@@ -0,0 +1,11 @@
+[Unit]
+Description=AutoSSH managed SSH tunnel to predefined host
+After=network.target
+
+[Service]
+Environment="AUTOSSH_GATETIME=0"
+EnvironmentFile=/etc/autotunnel/%I.conf
+ExecStart=/usr/lib/systemd/scripts/tunnel-to-host
+
+[Install]
+WantedBy=multi-user.target
-- 
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