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Refined dialogs in installer
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Reformatted some passages

Improved understandability of code (hopefully)
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@kinafu
kinafu committed May 18, 2018
1 parent df6f8c1 commit d46a2bf
Showing 1 changed file with 142 additions and 121 deletions.
263 changes: 142 additions & 121 deletions sudNET-always-online-installer.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -8,30 +8,38 @@ studnetPass=""
# be careful
studnetServerIP="139.18.143.253"

#install routine, do not change lines below

edit_studnetNr() {
echo "StudNET tenant number/Mieternummer: "
read -r studnetNr
echo "StudNET tenant number/Mieternummer: "
read -r studnetNr
}
edit_studnetPass() {
echo "StudNET password: "
stty -echo #posix compliant replacement for read -s
read -r studnetPass
stty echo
echo "StudNET password: "
stty -echo #posix compliant replacement for read -s
read -r studnetPass
stty echo
}
edit_studnetServerIP() {
echo "Only change this, if you obtained a different IP from the user manual."
echo "Instruction manual from the Studentenwerk may also be found online."
echo "Enter StudNET Server IP or just press [ENTER] to skip."
read -r temp
case "$temp" in
"\n" ) ;;
* ) studnetServerIP="$temp";;
esac
echo "Only change this, if you obtained a different IP from the user manual."
echo "Instruction manual from the Studentenwerk may also be found online."
echo "Enter StudNET Server IP or just press [ENTER] to skip."
read -r temp
case "$temp" in
"\n" ) ;;
* ) studnetServerIP="$temp";;
esac
}
connect_studnet() {
sshpass -p $studnetPass \
ssh -q -t -t -o StrictHostKeyChecking=no -o ConnectTimeout=5 \
$studnetNr@$studnetServerIP \
> /dev/null & #starting ssh in background
}


if [ "$(id -u)" -ne 0 ]; then
echo "Sorry, you need to run this as root"
echo "Sorry, you need to run the installer as root"
exit 1
fi

Expand All @@ -46,27 +54,26 @@ elif [ -e /etc/arch-release ]; then
else
echo "Looks like you are not running this installer on a Debian, Ubuntu, CentOS or ArchLinux system."
echo "No problem, just make sure you have installed ssh and sshpass."
echo "Are ssh and sshpass installed on your system? Please type [y]es/[n]o and press [ENTER]: "
echo "Are ssh and sshpass installed on your system? Please type [y]es or [n]o and press [ENTER]: "
read -r choice
case "$choice" in
y|Y|Yes|yes ) ;;
n|N ) echo "Leaving now." && exit 4;;
* ) ;;
esac
case "$choice" in
y|Y|Yes|yes ) ;;
n|N ) echo "Leaving now." && exit 4;;
* ) ;;
esac
fi

#ask for login credentials, if not entered at the beginning of the script
[ -z $studnetNr ] && edit_studnetNr;
[ -z $studnetPass ] && edit_studnetPass;
[ -z $studnetServerIP ] && edit_studnetServerIP;

echo "Now I will test the connection. "
echo "Now I will test the connection with StudNET Server. "
echo "Press [Enter] to continue."
read -r choice

echo "Now testing Studnet Client Login once..."
# "ping" StudNET Server to check basical connection
while ! (nc -z $studnetServerIP 22); do
while ! nc -z $studnetServerIP 22; do
echo "Cannot reach StudNET server. Make sure you're connected to the right LAN port in your appartment."
echo "Only one out of the two works."
echo "Check your network settings on the router or on your device."
Expand All @@ -78,124 +85,137 @@ while ! (nc -z $studnetServerIP 22); do
echo ""
read -r choice
case "$choice" in
y|Y|Yes|yes ) ;;
ip|\"ip\"|\"ip\". ) edit_studnetServerIP ;;
*) echo "Leaving now." && exit 4;;
y|Y|Yes|yes )
;;
ip|\"ip\"|\"ip\". )
edit_studnetServerIP ;;
*)
echo "Leaving now." && exit 4
esac
done

# login at StudNET server
while (
sshpass -p $studnetNr \
ssh -q -t -t -o StrictHostKeyChecking=no -o ConnectTimeout=5 \
$studnetPass@$studnetServerIP \
> /dev/null & #starting ssh in background
pid=$!
sleep 4
ps -p $pid >/dev/null
return_code=$? #if ssh session still running exitcode 0, connection should have been succesful
kill $pid >/dev/null 2>&1
[ ! $return_code ] ) do

echo "\n"
echo "Wwrong password/username."
echo "To try again press [Enter]."
echo "To ignore unsucessful login type \"ignore\""
read -r choice
case "$choice" in
ignore|\"ignore\"|no|n|N) ;;
* ) edit_studnetNr
edit_studnetPass
;;
esac
return_code=0
while ([ "$return_code" -eq 0 ]) do
connect_studnet
pid=$! #getting pid of ssh
# evaluate connection (is alive?)
sleep 4
ps -p $pid >/dev/null
return_code=$? #if ssh session still alive exitcode 0, ssh process found, connection should have been succesful
kill $pid >/dev/null 2>&1

if [ "$return_code" -gt 0 ]; then
echo "\n"
echo "Wrong password/username."
echo "To try again press [Enter]."
echo "To ignore unsucessful login type \"ignore\""
read -r choice
case "$choice" in
ignore|\"ignore\"|no|n|N)
choice="ignore"
;;
* )
edit_studnetNr
edit_studnetPass
;;
esac
fi
done

echo "Successfully logged in."
echo "The script will now update the installed packages and download required packages."
if [ "$choice" != "ignore" ]; then
echo "Successfully logged in."
fi

echo "We will now update your installed packages and download new required packages."

#connecting to StudNET server for internet for downloads
sshpass -p $studnetPass \
ssh -q -t -t -o StrictHostKeyChecking=no -o ConnectTimeout=5 \
$studnetNr@$studnetServerIP \
> /dev/null & #starting ssh in background
connect_studnet
pid=$!

echo "Press [ENTER] to continue."
read -r choice

#determine raspberry pi
if [ "$(cat /proc/cpuinfo | grep 'Hardware' | awk '{print $3}')" = "BCM2835" ]; then
raspi="true"
#add watchdog package to download list
additional_packages="watchdog"
raspi="true"
#add watchdog package to download list
additional_packages="watchdog"
fi

#install packages
return_code=0
if ps -p $pid >/dev/null; then #if ssh still connected/ if "everything fine" :)

if [ "$OS" = 'debian' ]; then
apt-get update && apt-get dist-upgrade
apt-get install openssh-client sshpass ca-certificates curl unattended-upgrades $additional_packages -y
[ "$?" -ne $return_code ] && return_code="$?"
#enable auto updates
if [ $return_code -eq 0 ]; then
sudo dpkg-reconfigure --priority=low unattended-upgrades #automatically install security updates for the OS (not for StudNET client)
fi
elif [ "$OS" = 'arch' ]; then
pacman -Syu openssh sshpass ca-certificates curl $additional_packages --needed --noconfirm
[ "$?" -ne $return_code ] && return_code="$?"

elif [ "$OS" = 'centos' ] || [ "$OS" = 'fedora' ]; then
dnf update -y
dnf install openssh-clients sshpass ca-certificates curl dnf-automatic $additional_packages -y
[ "$?" -ne $return_code ] && return_code="$?"
#enable auto updates
if [ "$(service yum-updatesd status > /dev/null)" -eq 0 ]; then
echo "Outdated auto update system detected. (yum-updates)"
echo "Please migrate to dnf-automatic."
return_code=1
fi
if [ $return_code -eq 0 ]; then
if [ "$( cat /etc/fedora-release | awk '{print $3}' )" -le 25 ]; then
systemctl enable dnf-automatic.timer
fi
if [ "$( cat /etc/fedora-release | awk '{print $3}' )" -ge 26 ]; then
systemctl enable dnf-automatic-install.timer
fi
fi
fi
kill $pid >/dev/null #kill ssh, which we needed for internet for downloads

if ! ps -p $pid >/dev/null; then
# if ssh still connected/ if "everything fine" :)
echo "no connection via StudNET"
exit 4
else
echo "no connection via StudNET"
exit 4;
case "$OS" in
'debian' )
apt-get update && apt-get dist-upgrade
apt-get install openssh-client sshpass ca-certificates curl unattended-upgrades $additional_packages -y
return_code="$?"

#enable auto updates
sudo dpkg-reconfigure --priority=low unattended-upgrades #automatically install security updates for the OS (not for StudNET client)
if [ "$return_code" -gt 0 ]; then
echo "Installing required packages failed. Aborting..."
exit 4
fi
;;
'arch' )
pacman -Syu openssh sshpass ca-certificates curl $additional_packages --needed --noconfirm
[ "$?" -ne $return_code ] && return_code="$?"
;;
'centos'|'fedora' )
dnf update -y
dnf install openssh-clients sshpass ca-certificates curl dnf-automatic $additional_packages -y
return_code="$?"
#enable auto updates
if [ $return_code -eq 0 ]; then
if [ "$( cat /etc/fedora-release | awk '{print $3}' )" -le 25 ]; then
systemctl enable dnf-automatic.timer
fi
if [ "$( cat /etc/fedora-release | awk '{print $3}' )" -ge 26 ]; then
systemctl enable dnf-automatic-install.timer
fi
fi
if [ "$(service yum-updatesd status > /dev/null)" -eq 0 ]; then
return_code=1
echo "Outdated auto update system detected. (yum-updates)"
echo "Please migrate to dnf-automatic."
fi
if [ "$return_code" -gt 0 ]; then
echo "Installing required packages failed. Aborting..."
exit 4
fi

;;
esac
fi
kill $pid >/dev/null #kill ssh, which we needed for internet for downloads

# firewall allow outgoing, should be standard,
# only needed, if you think, you messed around with firewall (which shouldn't be necessary :)
# following lines only needed, if you think, you messed around with firewall (which shouldn't be necessary :)

#sudo apt-get -y install ufw
#sudo ufw default allow outgoing
#sudo ufw enable

# watchdog to autostart in case of system crash
# watchdog to autostart in case of system crash (only for raspi)

if [ $raspi = true ]; then
echo "\n"
echo "Installing kernel module, in order to restart raspi at crucial crashes."
modprobe bcm2835_wdt
echo "bcm2835_wdt" | sudo tee -a /etc/modules
# edit watchdog config through uncommenting lines
sed -i '/^#.*max-load-1/s/^#//' /etc/watchdog.conf
sed -i '/^#.*watchdog-device/s/^#//' /etc/watchdog.conf
# add watchdog to startup applications
systemctl enable watchdog
service watchdog start
echo "\n"
echo "Installing kernel module, in order to restart raspi at crucial crashes."
modprobe bcm2835_wdt
echo "bcm2835_wdt" | sudo tee -a /etc/modules
# edit watchdog config through uncommenting lines
sed -i '/^#.*max-load-1/s/^#//' /etc/watchdog.conf
sed -i '/^#.*watchdog-device/s/^#//' /etc/watchdog.conf
# add watchdog to startup applications
systemctl enable watchdog
service watchdog start
fi


# studnet .sh script
# write studnet .sh script with individual username and password
touch /usr/local/bin/studnet.sh
sudo chmod u+rwx /usr/local/bin/studnet.sh

Expand All @@ -204,22 +224,22 @@ cat <<'EOF' | sudo tee /usr/local/bin/studnet.sh > /dev/null
HOST=https://bing.com
while true; do
while ! (curl --head --silent --connect-timeout 2 --cert-status "$HOST" > /dev/null && sleep 10); do #if 'ping' unsuccesful attempt to reconnect
echo "Pinging $HOST was unsucessful." >2
echo "Reconnecting now"
kill %1 > /dev/null 2>&1
sleep 3
while ! (curl --head --silent --connect-timeout 2 --cert-status "$HOST" > /dev/null && sleep 10); do #if 'ping' unsuccesful attempt to reconnect
echo "Pinging $HOST was unsucessful." >2
echo "Reconnecting now"
kill %1 > /dev/null 2>&1
sleep 3
EOF
echo "sshpass -p $studnetPass ssh -t -t -o StrictHostKeyChecking=no $studnetNr@$studnetServerIP &" | sudo tee -a /usr/local/bin/studnet.sh > /dev/null
cat <<'EOF' | sudo tee -a /usr/local/bin/studnet.sh > /dev/null
sleep 2
done
sleep 2
done
done
EOF

# create studnet service daemon, with autostart on system startup
touch /etc/systemd/system/studnet.service

# write service file, which executes studnet.sh script
cat <<'EOF' | sudo tee /etc/systemd/system/studnet.service > /dev/null
[Unit]
Description=StudNET permanent login
Expand All @@ -234,6 +254,7 @@ StandardError=journal
[Install]
WantedBy=multi-user.target
EOF

systemctl daemon-reload
systemctl enable studnet.service
service studnet start && echo "StudNET Client up and running. You may go ahead. Everything works automatically."
service studnet start && echo "StudNET Client up and running. You may go ahead. Auto-Login is turned on."

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