From a1458a66fb54e0c236b762e91cf149c782afe78a Mon Sep 17 00:00:00 2001
From: Gordon Grant-Stuart <gordon@grant-stuart.com>
Date: Tue, 22 Nov 2022 15:18:19 +0000
Subject: [PATCH] Added all the files

---
 README.md                |  9 +++--
 etc/tunnels.conf.example |  9 +++++
 tunnelkeeper             | 72 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 88 insertions(+), 2 deletions(-)
 create mode 100644 etc/tunnels.conf.example
 create mode 100644 tunnelkeeper

diff --git a/README.md b/README.md
index 8676ef9..e039864 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,8 @@
-# TunnelKeeper
+# tunnelkeeper
+### TunnelKeeper keeps SSH tunnels open
 
-TunnelKeeper keeps SSH tunnels open
\ No newline at end of file
+Install it as a service with `tunnelkeeper install`.
+
+Create a config file `/opt/tunnelkeeper/etc/tunnels.conf`. It's an ssh config file, so see `man ssh_config` for information. TunnelKeeper will connect to each host listed, and make sure every connection in `tunnels.conf` stays open in the background.
+
+If you make changes to tunnels.conf, run `systemctl restart tunnelkeeper`.
diff --git a/etc/tunnels.conf.example b/etc/tunnels.conf.example
new file mode 100644
index 0000000..ef2f325
--- /dev/null
+++ b/etc/tunnels.conf.example
@@ -0,0 +1,9 @@
+Host server1
+  Hostname 123.45.67.89
+  User ubuntu
+  LocalForward 10001 127.0.0.1:22
+
+Host server1
+  Hostname 123.45.67.90
+  User ubuntu
+  LocalForward 10002 127.0.0.1:22
diff --git a/tunnelkeeper b/tunnelkeeper
new file mode 100644
index 0000000..141adba
--- /dev/null
+++ b/tunnelkeeper
@@ -0,0 +1,72 @@
+#!/usr/bin/env bash
+
+REALPATH="$(realpath $0)"
+BASEDIR="${REALPATH%/*}"
+
+mkdir -p "$BASEDIR/var"
+mkdir -p "$BASEDIR/etc"
+CONFFILE="$BASEDIR/etc/tunnels.conf"
+
+if [[ ! -f "$CONFFILE" ]]; then
+  echo "Config file \"$CONFFILE\" does not exist"
+  exit 1
+fi
+
+case "$1" in
+  FORKSTART )
+    touch "$BASEDIR/var/${2}.connected"
+    while [[ -e "$BASEDIR/var/${2}.connected" ]]; do
+      ssh -F $CONFFILE -N $2 &> /dev/null
+      sleep 5
+    done
+  ;;
+  FORKKILL )
+    kill $(sudo netstat -tnlp | grep "127.0.0.1:${2}" | grep -o '[0-9]*/ssh' | grep -o '[0-9]*') &>/dev/null
+  ;;
+  FORKDEL )
+    rm "$BASEDIR/var/${2}.connected"
+  ;;
+  start)
+    if [[ -e "$BASEDIR/var/tunnelkeeper.pid" ]]; then
+      exit
+    fi
+    echo $$ > "$BASEDIR/var/tunnelkeeper.pid"
+    cat $CONFFILE | grep '^Host ' | sed 's/^Host //' | xargs -I% -P0 $0 FORKSTART % &>/dev/null &
+  ;;
+  stop)
+    rm "$BASEDIR/var/tunnelkeeper.pid"
+    cat $CONFFILE | grep '^Host ' | sed 's/^Host //' | xargs -I% -P0 $0 FORKDEL %
+    cat $CONFFILE | grep -o 'LocalForward [0-9]* ' | grep -o '[0-9]*' | xargs -I% -P0 $0 FORKKILL % &>/dev/null
+  ;;
+  install )
+    if [[ $UID -ne 0 ]]; then
+      echo "You must be root to do this"
+      exit
+    fi
+    mkdir -p /opt/tunnelkeeper/var
+    mkdir -p /opt/tunnelkeeper/etc
+    if [[ -f "$BASEDIR/etc/tunnels.conf" ]]; then
+      cp "$BASEDIR/etc/tunnels.conf" /opt/tunnelkeeper/etc
+    fi
+    cp "$REALPATH" "/opt/tunnelkeeper/tunnelkeeper.sh"
+    echo "[Unit]
+Description=TunnelKeeper keeps SSH tunnels open.
+After=network.target
+[Service]
+User=root
+Group=root
+Type=forking
+ExecStart=/opt/tunnelkeeper/tunnelkeeper.sh start
+ExecStop=/opt/tunnelkeeper/tunnelkeeper.sh stop
+RestartSec=15
+Restart=always
+[Install]
+WantedBy=multi-user.target" >> /lib/systemd/system/tunnelkeeper.service
+    systemctl daemon-reload
+    systemctl enable tunnelkeeper.service
+    echo "tunnelkeeper service installed"
+  ;;
+  * )
+    echo -e "\nUsage: $(basename $0) [start|stop|install]\n"
+  ;;
+esac