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

  • virt-resize: error: libguestfs error: could not create appliance through libvirt.
  • Asterisk Does Not Retry When Authentication Fails
  • Linux Debian Ubuntu How To Install PEPPER Faster and Latest Adobe Flash Player in Firefox
  • How To Speed Up Linux Ubuntu and Debian Based Computers By Improving CPU Performance and Changing the CPU Governor
  • Convert data or file to base64 on a single line
  • Linux Mint Ubuntu Debian radeon slow 2D performance issues radeon_dp_aux_transfer_native: 158 callbacks suppressed
  • mdadm: super0.90 cannot open /dev/sdb1: Device or resource busy mdadm: /dev/sdb1 is not suitable for this array.
  • How To Install NextCloud on Centos 7 and Centos 8
  • AH01630: client denied by server configuration:
  • ERROR: Could not find a version that satisfies the requirement PIL (from versions: none) ERROR: No matching distribution found for PIL
  • ZTE Camera Cannot Work unable to connect to camera. Camera has been disabled becaue of security policies or is being used by other apps
  • QEMU KVM how to boot off a physical CD/DVD/BDROM Drive
  • How To Install OpenProject on Centos 7 Step-by-Step Guide
  • Ubuntu Debian Linux Cannot Install Wine Solution - wine1.6 : Depends: wine1.6-i386 (= 1:1.6.2-0ubuntu14.2) but it is not installable wine1.4 : Depends: wine1.6 but it is not going to be installed
  • How To Install python 3.4 3.5 and up on Linux with wine - Working Solution
  • using Xvfb on virtual remote ssh server to have X graphical programs work
  • ssh Received disconnect from port 22:2: Too many authentication failures
  • named bind errors - DNSKEY: unable to find a DNSKEY which verifies the DNSKEY RRset and also matches a trusted key for '.'
  • OpenVZ vs LXC DIR mode poor security in LXC
  • httpd: Syntax error on line 221 of /etc/httpd/conf/httpd.conf: Syntax error on line 6 of /etc/httpd/conf.d/php.conf: Cannot load modules/libphp5.so into server: /lib64/libresolv.so.2: symbol __h_errno, version GLIBC_PRIVATE not defined in file libc.s