tools/autossh.sh

This is a small script which allows you reconnect to SSH automatically without installing a package like `mosh-server`

tools/autossh.sh

+#!/usr/bin/env bash
+# ------------------------------------------------------------------------------
+# FILE: autossh
+# DESCRIPTION: This is an SSH-D proxy with auto-reconnect on disconnect
+# AUTHOR: Toan Nguyen (nntoan at protonmail dot com)
+# VERSION: 1.0.0
+# ------------------------------------------------------------------------------
+VERSION="1.0.0"
+GITHUB="https://github.com/nntoan/autossh"
+AUTHOR="Toan Nguyen"
+SCRIPT=${0##*/}
+IFS=$'\n'
+ALIVE=0
+HISTFILE="$HOME/.autossh.history"
+
+# Use colors, but only if connected to a terminal, and that terminal supports them.
+if which tput >/dev/null 2>&1; then
+  ncolors=$(tput colors)
+fi
+if [ -t 1 ] && [ -n "$ncolors" ] && [ "$ncolors" -ge 8 ]; then
+  RED="$(tput setaf 1)"
+  GREEN="$(tput setaf 2)"
+  YELLOW="$(tput setaf 3)"
+  BLUE="$(tput setaf 4)"
+  BOLD="$(tput bold)"
+  NORMAL="$(tput sgr0)"
+else
+  RED=""
+  GREEN=""
+  YELLOW=""
+  BLUE=""
+  BOLD=""
+  NORMAL=""
+fi
+
+# Progress or something
+start_progress()
+{
+  while true
+  do
+    echo -ne "#"
+    sleep 1
+  done
+}
+
+quick_progress()
+{
+  while true
+  do
+    echo -ne "#"
+    sleep .033
+  done
+}
+
+long_progress()
+{
+  while true
+  do
+    echo -ne "#"
+    sleep 3
+  done
+}
+
+dot_progress()
+{
+  for i in {1..100}; do
+    printf "." $i -1 $i
+    sleep .033
+  done
+  echo_c green " 100%{$NORMAL}"
+  sleep 1
+}
+
+stop_progress()
+{
+  kill $1
+  wait $1 2>/dev/null
+  echo -en "\n"
+}
+
+# Case-insensitive for regex matching
+shopt -s nocasematch
+
+# Prepare history mode
+set -i
+history -c
+history -r
+
+# Input method
+get_input()
+{
+  read -e -p "${BLUE}$1${NORMAL}" "$2"
+  history -s "${!2}"
+}
+
+# Echo in bold
+echo_b()
+{
+  if [ "$1" = "-e" ]; then
+    echo -e "${BOLD}$2${NORMAL}"
+  else
+    echo "${BOLD}$1${NORMAL}"
+  fi
+}
+
+# Echo in colour
+echo_c()
+{
+  case "$1" in
+    red | r | -red | -r | --red | --r ) echo "${RED}$2${NORMAL}" ;;
+    green | g | -green | -g | --green | --g ) echo "${GREEN}$2${NORMAL}" ;;
+    blue | b | -blue | -b | --blue | --b ) echo "${BLUE}$2${NORMAL}" ;;
+    yellow | y | -yellow | -y | --yellow | --y ) echo "${YELLOW}$2${NORMAL}" ;;
+    * ) echo "$(BOLD)$2$(RESET)" ;;
+  esac
+}
+
+# Get data from parameters
+if [[ ! -n "$remote_param" && -n "$1" ]]; then
+    remote_param="$1"
+    remote_user="${remote_param%%@*}"
+    remote_ip="${remote_param##*@}"
+fi
+
+# Get input data and save to history
+save_input()
+{
+  if [[ ! -n "$remote_user" && ! -n "$1" ]]; then
+    while get_input "SSH Username > " remote_user; do
+      case ${remote_user%% *} in
+        * )
+            if [ -n "$remote_user" ]; then
+              break
+            else
+              continue
+            fi
+        ;;
+      esac
+    done
+  fi
+  if [[ ! -n "$remote_ip" && ! -n "$1" ]]; then
+    while get_input "SSH Alias/IP-address > " remote_ip; do
+      case ${remote_ip%% *} in
+        * )
+            if [ -n "$remote_ip" ]; then
+              break
+            else
+              continue
+            fi
+        ;;
+      esac
+    done
+  fi
+}
+
+# Infinitie loop to keep connecting
+auto_connect()
+{
+  while true; do
+    exist=`ps aux | grep $remote_user@$remote_ip | grep 22`
+    if test -n "$exist"
+    then
+      if test $ALIVE -eq 0
+      then
+        echo_c yellow "I'm alive since $(date)"
+      fi
+      ALIVE=1
+    else
+      ALIVE=0
+      echo_c red "I'm dead... God is bringing me back..."
+      clear
+      printf "${GREEN}Connecting: "
+      for i in {1..100}; do
+        printf "." $i -1 $i
+        sleep .033
+      done
+      echo_c green " 100%${NORMAL}"
+      sleep 1
+      clear
+      ssh $remote_user@$remote_ip
+    fi
+    sleep 1
+  done
+}
+
+main()
+{
+  save_input
+  auto_connect
+}
+
+main