From bd10cd17c2d2e29c72ee8ad248fecc4df6a7711a Mon Sep 17 00:00:00 2001
From: waldek <waldek@86thumbs.net>
Date: Mon, 17 Jan 2022 11:33:57 +0100
Subject: [PATCH] initial commit

---
 install.sh        | 47 ++++++++++++++++++++++++++++++++++++++++++++
 readme.md         | 16 +++++++++++++++
 tmux_broadcast.sh | 34 ++++++++++++++++++++++++++++++++
 tmux_viewer.sh    | 50 +++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 147 insertions(+)
 create mode 100755 install.sh
 create mode 100644 readme.md
 create mode 100755 tmux_broadcast.sh
 create mode 100755 tmux_viewer.sh

diff --git a/install.sh b/install.sh
new file mode 100755
index 0000000..cb20607
--- /dev/null
+++ b/install.sh
@@ -0,0 +1,47 @@
+#!/usr/bin/bash
+
+if [ "$EUID" -ne 0 ]
+	then echo "Please run as root"
+	exit 1
+fi
+
+VIEWER="tmuxviewer"
+SSHD_CONFIG_FOLDER="/etc/ssh/sshd_config.d/"
+CONFIG_FILE="$VIEWER.config"
+CONFIG_FILE_PATH="$SSHD_CONFIG_FOLDER$CONFIG_FILE"
+BIN_FOLDER="/usr/bin/"
+VIEWER_BIN="tmux_viewer.sh"
+BROADCAST_BIN="tmux_broadcast.sh"
+
+function install_tmuxviewer () {
+	echo "adding $VIEWER_BIN and $BROADCAST_BIN to $BIN_FOLDER"
+	sudo cp $VIEWER_BIN $BIN_FOLDER$VIEWER_BIN
+	sudo cp $BROADCAST_BIN $BIN_FOLDER$BROADCAST_BIN
+	echo "adding user $VIEWER"
+	sudo useradd --home /tmp/$VIEWER --shell /usr/bin/tmux_viewer.sh $VIEWER
+	echo "unsetting password for $VIEWER"
+	sudo passwd -d $VIEWER 1> /dev/null
+	sudo mkdir -p $SSHD_CONFIG_FOLDER
+	sudo echo "Match User $VIEWER\n\tPermitEmptyPassword yes" > $CONFIG_FILE_PATH
+}
+
+function uninstall_tmuxviewer () {
+	echo "removing user $VIEWER"
+	sudo userdel $VIEWER
+	sudo rm $CONFIG_FILE_PATH
+	sudo rm $BIN_FOLDER$VIEWER_BIN
+	sudo rm $BIN_FOLDER$BROADCAST_BIN
+}
+
+case $1 in
+	install)
+		uninstall_tmuxviewer 2> /dev/null
+		install_tmuxviewer
+		;;
+	uninstall)
+		uninstall_tmuxviewer
+		;;
+	*)
+		echo "usage (as root): $0 [install|uninstall]"
+		;;
+esac
diff --git a/readme.md b/readme.md
new file mode 100644
index 0000000..a0c8bce
--- /dev/null
+++ b/readme.md
@@ -0,0 +1,16 @@
+# Tmux Viewer
+
+Simple script combo to allow people to see what you're doing in a specific tmux session.
+
+## Dependencies
+
+```sudo apt install tmux```
+
+## Install
+
+```sudo bash install.sh install```
+
+## Uninstall
+
+```sudo bash install.sh uninstall```
+
diff --git a/tmux_broadcast.sh b/tmux_broadcast.sh
new file mode 100755
index 0000000..d18d006
--- /dev/null
+++ b/tmux_broadcast.sh
@@ -0,0 +1,34 @@
+#!/bin/bash
+
+USER="$(whoami)"
+VIEWER="tmuxviewer"
+SOCKET="/tmp/$VIEWER/$USER"
+
+if groups $USER | grep -q "sudo"; then
+	mkdir -p /tmp/$VIEWER/
+	sudo chown $VIEWER:$VIEWER "/tmp/$VIEWER"
+	sudo chmod 777 /tmp/$VIEWER/ 2> /dev/null
+	sudo chown $USER:$VIEWER $SOCKET
+	sudo chmod 770 $SOCKET
+else
+	echo "sorry, you're not allowed to broadcast.."
+	exit 1
+fi
+
+
+tmux -S $SOCKET has-session -t shared 2> /dev/null
+
+if [ $? != 0 ]; then
+	if groups $USER | grep -q "sudo"; then
+		echo "no shared session running, creating one..."
+		tmux -S $SOCKET new-session -A -s shared -d
+		sudo chown $USER:$VIEWER $SOCKET
+		chmod 770 $SOCKET
+	else
+		echo "you are not allowed to take over..."
+		exit 1
+	fi
+fi
+
+echo "attaching to $SOCKET"
+tmux -S $SOCKET attach -t shared
diff --git a/tmux_viewer.sh b/tmux_viewer.sh
new file mode 100755
index 0000000..344dbad
--- /dev/null
+++ b/tmux_viewer.sh
@@ -0,0 +1,50 @@
+#!/bin/bash
+
+VIEWER="tmuxviewer"
+SOCKETS="/tmp/$VIEWER/"
+SESSIONS="$(ls $SOCKETS)"
+HOSTNAME="$(hostname).$(grep domain /etc/resolv.conf | cut -d " " -f 2)"
+
+function select_session () {
+	if [ $(echo $SESSIONS | wc -w) == 1 ]; then
+		SOCKET=$SOCKETS$SESSIONS
+		echo $SOCKET
+	else
+		echo "please choose a session to view: (or exit to quit)"
+		select session in $(echo $SESSIONS); do
+			if [ -n "$session" ]; then
+				SOCKET=$SOCKETS$session
+				echo "connection to $session at $SOCKET"
+				view_session
+			else
+				case $REPLY in
+					exit) 
+						echo "will quit now"
+						break;;
+					*)
+						echo "refreshing list..."
+						select_session
+						;;
+				esac
+			fi
+
+		done
+	fi
+}
+
+function view_session () {
+	clear
+	while : 
+	do
+		tmux -S $SOCKET attach -t shared -r 2>/dev/null
+		clear
+		echo "$HOSTNAME is not broadcasting at $SOCKET..."
+		sleep 1
+	done
+}
+
+function main () {
+	select_session
+}
+
+main