SSH persistent and automatic login script for proxy

#!/bin/bash

sshcommand="ssh -N -R 20000:localhost:22 user@8.8.8.8"
result=`ps aux|grep $sshcommand"|grep -v grep`

if [ -z "$result" ]; then
   echo "we are going to connect"
   $sshcommand
else
  echo "we are already connected"
fi

This is a handy script you can use and then add it to cron.

Save it as proxy.sh and add this to your cron (this will check every minute and start the SSH proxy if it is not running):

crontab -e

*1/ * * * * /home/user/proxy.sh


Server Side

What happens is that the connection breaks for some reason.  Now your client will reconnect but it won't be able to listen on the port possibly because the server side still has the stale SSH process listening on your proxy port.

We need a script to check that the proxy port is open and SSH is accessible.  If the port is open but we don't get served SSH then we will find the process for the port and kill it so a new, working connection can be made.

Put this into a cron as "checkproxy.sh":

#!/bin/bash

proxyport=20000
checkstatus=`nc -w 3 localhost $proxyport|grep -i openssh`

if [[ $checkstatus == *OpenSSH* ]]; then
  echo "OK proxy is up and working"
else
  # find the related sshd process
  pid=`netstat -anptu|grep $proxyport|grep sshd|awk {'print $7'}|cut -d "/" -f 1`
  echo "it is not working let's kill the process so the client can reconnect"
  kill $pid
fi

 


Tags:

ssh, persistent, login, proxy, bin, bash, sshcommand, quot, localhost, user, ps, aux, grep, z, echo, fi, cron, sh, crontab,

Latest Articles

  • FreePBX 17 How To Add a Trunk
  • Docker Container Onboot Policy - How to make sure a container is always running
  • FreePBX 17 How To Add Phones / Extensions and Register
  • Warning: The driver descriptor says the physical block size is 2048 bytes, but Linux says it is 512 bytes. solution
  • Cisco How To Use a Third Party SIP Phone (eg. Avaya, 3CX)
  • Cisco Unified Communication Manager (CUCM) - How To Add Phones
  • pptp / pptpd not working in DD-WRT iptables / router
  • systemd-journald high memory usage solution
  • How to Install FreePBX 17 in Linux Debian Ubuntu Mint Guide
  • How To Install Cisco's CUCM (Cisco Unified Communication Manager) 12 Guide
  • Linux Ubuntu Redhat How To Extract Images from PDF
  • Linux and Windows Dual Boot Issue NIC Won't work After Booting Windows
  • Cisco CME How To Enable ACD hunt groups
  • How to install gns3 on Linux Ubuntu Mint
  • How to convert audio for Asterisk .wav format
  • Using Cisco CME Router with Asterisk as a dial-peer
  • Cisco CME How To Configure SIP Trunk VOIP
  • Virtualbox host Only Network Error Failed to save host network interface parameter - Cannot change gateway IP of host only network
  • Cisco CME and C7200 Router Testing and Learning Environment on Ubuntu 20+ Setup Tutorial Guide
  • Abusive IP ranges blacklist