Renaud OLGIATI [2016-01-30 16:33:31-03] wrote: > Is there a way for a system admin to post a message on the desktops of > all the machines on a LAN ?
I'm doing the same thing in a network where every machine gets their IP
through DHCP. The network is scanned with nmap for open ssh servers.
Luckily on every machine there is always the same Linux user. Every
machine has ssh server, admin's ssh public key in .authorized_keys file
and gxmessage package.
My script that can do different maintenance tasks but here's a stripped
version that has only the message part.
--8<---------------cut here---------------start------------->8---
#!/bin/bash
network=192.168.0.0/24
gpgkey=08:6d:f8:f4:aa:73:5c:d9:4c:f8:02:a1:f6:12:e3:1d
gpgkeyfile=$HOME/.ssh/admin_key_rsa
userhome=/home/user
message=$(printf '%q' "$*")
timestamp=$(date '+%Y-%m-%d %H:%M')
set -- XAUTHORITY=$userhome/.Xauthority \
gxmessage -display :0 -fn "'Sans 20'" -wrap \
-geometry 800x500 -center -title "'Message $timestamp'" \
"$message"
ssh-add -l | grep -F -q -e "$gpgkey" || ssh-add "$gpgkeyfile" || exit 1
unset NFS
echo "Looking for open ssh servers in network $network..."
ips=( $(nmap -T4 -PE -sS -n -p 22 "$network" | \
awk '/report for/ {ip=$5} /open *ssh/ {print ip}') )
total=${#ips[@]}
if [ "$total" -eq 0 ]; then
echo "Didn't find any machines."
exit 1
fi
i=1
for ip in "${ips[@]}"; do
echo "$i/$total $ip: Connecting to machine..."
ssh -qf -o StrictHostKeyChecking=no -o BatchMode=yes root@"$ip" "$@"
let i++
done
--8<---------------cut here---------------end--------------->8---
--
/// Teemu Likonen - .-.. <https://github.com/tlikonen> //
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