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Detect current netmask, validate user input when configuring a static IP

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This commit is contained in:
Orazio 2020-01-25 17:43:23 +01:00
parent 0994ac7d5a
commit d1a781075a
3 changed files with 92 additions and 46 deletions
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134
auto_install/install.sh
View file

@ -59,9 +59,12 @@ c=$(( columns / 2 ))
r=$(( r < 20 ? 20 : r )) r=$(( r < 20 ? 20 : r ))
c=$(( c < 70 ? 70 : c )) c=$(( c < 70 ? 70 : c ))
# Find IP used to route to outside world # Find IP (with netmask) and gateway used to route to outside world
CurrentIPv4addr=$(ip route get 192.0.2.1 | awk '{print $7}') BaseIPv4addr=$(ip route get 192.0.2.1| awk '{print $7}')
CurrentIPv4addr=$(ip -o -f inet address | grep "${BaseIPv4addr}/" | awk '{print $4}')
CurrentIPv4gw=$(ip route get 192.0.2.1 | awk '{print $3}') CurrentIPv4gw=$(ip route get 192.0.2.1 | awk '{print $3}')
# Find network interfaces whose state is UP, so as to skip virtual interfaces and the loopback interface
availableInterfaces=$(ip -o link | awk '/state UP/ {print $2}' | cut -d':' -f1 | cut -d'@' -f1) availableInterfaces=$(ip -o link | awk '/state UP/ {print $2}' | cut -d':' -f1 | cut -d'@' -f1)
######## SCRIPT ############ ######## SCRIPT ############
@ -601,7 +604,7 @@ validIP(){
if [[ $ip =~ ^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]]; then if [[ $ip =~ ^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]]; then
OIFS=$IFS OIFS=$IFS
IFS='.' IFS='.'
read -r -a ip <<< "$ip" read -r -a ip <<< "$ip"
IFS=$OIFS IFS=$OIFS
[[ ${ip[0]} -le 255 && ${ip[1]} -le 255 \ [[ ${ip[0]} -le 255 && ${ip[1]} -le 255 \
&& ${ip[2]} -le 255 && ${ip[3]} -le 255 ]] && ${ip[2]} -le 255 && ${ip[3]} -le 255 ]]
@ -610,6 +613,24 @@ validIP(){
return $stat return $stat
} }
validIPAndNetmask(){
local ip=$1
local stat=1
ip="${ip/\//.}"
if [[ $ip =~ ^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,2}$ ]]; then
OIFS=$IFS
IFS='.'
read -r -a ip <<< "$ip"
IFS=$OIFS
[[ ${ip[0]} -le 255 && ${ip[1]} -le 255 \
&& ${ip[2]} -le 255 && ${ip[3]} -le 255 \
&& ${ip[4]} -le 32 ]]
stat=$?
fi
return $stat
}
getStaticIPv4Settings() { getStaticIPv4Settings() {
# Grab their current DNS Server # Grab their current DNS Server
IPv4dns=$(grep nameserver /etc/resolv.conf | awk '{print $2}' | xargs) IPv4dns=$(grep nameserver /etc/resolv.conf | awk '{print $2}' | xargs)
@ -632,10 +653,10 @@ getStaticIPv4Settings() {
if [ "$MISSING_STATIC_IPV4_SETTINGS" -eq 0 ]; then if [ "$MISSING_STATIC_IPV4_SETTINGS" -eq 0 ]; then
# If both settings are not empty, check if they are valid and proceed # If both settings are not empty, check if they are valid and proceed
if validIP "${IPv4addr%/*}"; then if validIPAndNetmask "${IPv4addr}"; then
echo "::: Your static IPv4 address: ${IPv4addr}" echo "::: Your static IPv4 address: ${IPv4addr}"
else else
echo "::: ${IPv4addr%/*} is not a valid IP address" echo "::: ${IPv4addr} is not a valid IP address"
exit 1 exit 1
fi fi
@ -667,22 +688,23 @@ getStaticIPv4Settings() {
fi fi
echo "dhcpReserv=${dhcpReserv}" >> /tmp/setupVars.conf echo "dhcpReserv=${dhcpReserv}" >> /tmp/setupVars.conf
echo "IPv4addr=${IPv4addr%/*}" >> /tmp/setupVars.conf echo "IPv4addr=${IPv4addr}" >> /tmp/setupVars.conf
echo "IPv4gw=${IPv4gw}" >> /tmp/setupVars.conf echo "IPv4gw=${IPv4gw}" >> /tmp/setupVars.conf
return return
fi fi
local ipSettingsCorrect local ipSettingsCorrect
local IPv4AddrValid
local IPv4gwValid
# Some users reserve IP addresses on another DHCP Server or on their routers, # Some users reserve IP addresses on another DHCP Server or on their routers,
# Lets ask them if they want to make any changes to their interfaces. # Lets ask them if they want to make any changes to their interfaces.
IPv4addr="${CurrentIPv4addr}"
IPv4gw="${CurrentIPv4gw}"
if (whiptail --backtitle "Calibrating network interface" --title "DHCP Reservation" --yesno \ if (whiptail --backtitle "Calibrating network interface" --title "DHCP Reservation" --yesno \
"Are you Using DHCP Reservation on your Router/DHCP Server? "Are you Using DHCP Reservation on your Router/DHCP Server?
These are your current Network Settings: These are your current Network Settings:
IP address: ${IPv4addr} IP address: ${CurrentIPv4addr}
Gateway: ${IPv4gw} Gateway: ${CurrentIPv4gw}
Yes: Keep using DHCP reservation Yes: Keep using DHCP reservation
No: Setup static IP address No: Setup static IP address
@ -690,56 +712,80 @@ Don't know what DHCP Reservation is? Answer No." ${r} ${c}); then
dhcpReserv=1 dhcpReserv=1
# shellcheck disable=SC2129 # shellcheck disable=SC2129
echo "dhcpReserv=${dhcpReserv}" >> /tmp/setupVars.conf echo "dhcpReserv=${dhcpReserv}" >> /tmp/setupVars.conf
echo "IPv4addr=${IPv4addr%/*}" >> /tmp/setupVars.conf # We don't really need to save them as we won't set a static IP but they might be useful for debugging
echo "IPv4gw=${IPv4gw}" >> /tmp/setupVars.conf echo "IPv4addr=${CurrentIPv4addr}" >> /tmp/setupVars.conf
echo "IPv4gw=${CurrentIPv4gw}" >> /tmp/setupVars.conf
else else
# Ask if the user wants to use DHCP settings as their static IP # Ask if the user wants to use DHCP settings as their static IP
if (whiptail --backtitle "Calibrating network interface" --title "Static IP Address" --yesno "Do you want to use your current network settings as a static address? if (whiptail --backtitle "Calibrating network interface" --title "Static IP Address" --yesno "Do you want to use your current network settings as a static address?
IP address: ${IPv4addr}
Gateway: ${IPv4gw}" ${r} ${c}); then
echo "IPv4addr=${IPv4addr%/*}" >> /tmp/setupVars.conf IP address: ${CurrentIPv4addr}
echo "IPv4gw=${IPv4gw}" >> /tmp/setupVars.conf Gateway: ${CurrentIPv4gw}" ${r} ${c}); then
# If they choose yes, let the user know that the IP address will not be available via DHCP and may cause a conflict. IPv4addr=${CurrentIPv4addr}
whiptail --msgbox --backtitle "IP information" --title "FYI: IP Conflict" "It is possible your router could still try to assign this IP to a device, which would cause a conflict. But in most cases the router is smart enough to not do that. IPv4gw=${CurrentIPv4gw}
echo "IPv4addr=${IPv4addr}" >> /tmp/setupVars.conf
echo "IPv4gw=${IPv4gw}" >> /tmp/setupVars.conf
# If they choose yes, let the user know that the IP address will not be available via DHCP and may cause a conflict.
whiptail --msgbox --backtitle "IP information" --title "FYI: IP Conflict" "It is possible your router could still try to assign this IP to a device, which would cause a conflict. But in most cases the router is smart enough to not do that.
If you are worried, either manually set the address, or modify the DHCP reservation pool so it does not include the IP you want. If you are worried, either manually set the address, or modify the DHCP reservation pool so it does not include the IP you want.
It is also possible to use a DHCP reservation, but if you are going to do that, you might as well set a static address." ${r} ${c} It is also possible to use a DHCP reservation, but if you are going to do that, you might as well set a static address." ${r} ${c}
# Nothing else to do since the variables are already set above # Nothing else to do since the variables are already set above
else else
# Otherwise, we need to ask the user to input their desired settings. # Otherwise, we need to ask the user to input their desired settings.
# Start by getting the IPv4 address (pre-filling it with info gathered from DHCP) # Start by getting the IPv4 address (pre-filling it with info gathered from DHCP)
# Start a loop to let the user enter their information with the chance to go back and edit it if necessary # Start a loop to let the user enter their information with the chance to go back and edit it if necessary
until [[ ${ipSettingsCorrect} = True ]]; do until [[ ${ipSettingsCorrect} = True ]]; do
# Ask for the IPv4 address
if IPv4addr=$(whiptail --backtitle "Calibrating network interface" --title "IPv4 address" --inputbox "Enter your desired IPv4 address" ${r} ${c} "${IPv4addr}" 3>&1 1>&2 2>&3) ; then until [[ ${IPv4AddrValid} = True ]]; do
echo "::: Your static IPv4 address: ${IPv4addr}" # Ask for the IPv4 address
# Ask for the gateway if IPv4addr=$(whiptail --backtitle "Calibrating network interface" --title "IPv4 address" --inputbox "Enter your desired IPv4 address" ${r} ${c} "${CurrentIPv4addr}" 3>&1 1>&2 2>&3) ; then
if IPv4gw=$(whiptail --backtitle "Calibrating network interface" --title "IPv4 gateway (router)" --inputbox "Enter your desired IPv4 default gateway" ${r} ${c} "${IPv4gw}" 3>&1 1>&2 2>&3) ; then if validIPAndNetmask "${IPv4addr}"; then
echo "::: Your static IPv4 gateway: ${IPv4gw}" echo "::: Your static IPv4 address: ${IPv4addr}"
# Give the user a chance to review their settings before moving on IPv4AddrValid=True
if (whiptail --backtitle "Calibrating network interface" --title "Static IP Address" --yesno "Are these settings correct?
IP address: ${IPv4addr}
Gateway: ${IPv4gw}" ${r} ${c}); then
# If the settings are correct, then we need to set the pivpnIP
echo "IPv4addr=${IPv4addr%/*}" >> /tmp/setupVars.conf
echo "IPv4gw=${IPv4gw}" >> /tmp/setupVars.conf
# After that's done, the loop ends and we move on
ipSettingsCorrect=True
else else
# If the settings are wrong, the loop continues whiptail --msgbox --backtitle "Calibrating network interface" --title "IPv4 address" "You entered an invalid IPv4 address.\\n\\nPlease enter an IP address in the CIDR notation, example: 192.168.23.211/24.\\n\\nIf you are not sure, please just keep the default." ${r} ${c}
ipSettingsCorrect=False echo "::: Invalid IPv4 address: ${IPv4addr}"
IPv4AddrValid=False
fi fi
else else
# Cancelling gateway settings window # Cancelling IPv4 settings window
ipSettingsCorrect=False
echo "::: Cancel selected. Exiting..." echo "::: Cancel selected. Exiting..."
exit 1 exit 1
fi fi
done
until [[ ${IPv4gwValid} = True ]]; do
# Ask for the gateway
if IPv4gw=$(whiptail --backtitle "Calibrating network interface" --title "IPv4 gateway (router)" --inputbox "Enter your desired IPv4 default gateway" ${r} ${c} "${CurrentIPv4gw}" 3>&1 1>&2 2>&3) ; then
if validIP "${IPv4gw}"; then
echo "::: Your static IPv4 gateway: ${IPv4gw}"
IPv4gwValid=True
else
whiptail --msgbox --backtitle "Calibrating network interface" --title "IPv4 gateway (router)" "You entered an invalid IPv4 address.\\n\\nPlease enter the IP address of your gateway (router), example: 192.168.23.1.\\n\\nIf you are not sure, please just keep the default." ${r} ${c}
echo "::: Invalid IPv4 gateway: ${IPv4gw}"
IPv4gwValid=False
fi
else
# Cancelling gateway settings window
echo "::: Cancel selected. Exiting..."
exit 1
fi
done
# Give the user a chance to review their settings before moving on
if (whiptail --backtitle "Calibrating network interface" --title "Static IP Address" --yesno "Are these settings correct?
IP address: ${IPv4addr}
Gateway: ${IPv4gw}" ${r} ${c}); then
# If the settings are correct, then we need to set the pivpnIP
echo "IPv4addr=${IPv4addr}" >> /tmp/setupVars.conf
echo "IPv4gw=${IPv4gw}" >> /tmp/setupVars.conf
# After that's done, the loop ends and we move on
ipSettingsCorrect=True
else else
# Cancelling IPv4 settings window # If the settings are wrong, the loop continues
ipSettingsCorrect=False ipSettingsCorrect=False
echo "::: Cancel selected. Exiting..."
exit 1
fi fi
done done
# End the if statement for DHCP vs. static # End the if statement for DHCP vs. static

2
unattended_openvpn_example.conf
View file

@ -1,5 +1,5 @@
IPv4dev=eth0 IPv4dev=eth0
IPv4addr=192.168.23.211 IPv4addr=192.168.23.211/24
IPv4gw=192.168.23.1 IPv4gw=192.168.23.1
dhcpReserv=0 dhcpReserv=0
install_user=pi install_user=pi

2
unattended_wireguard_example.conf
View file

@ -1,5 +1,5 @@
IPv4dev=eth0 IPv4dev=eth0
IPv4addr=192.168.23.211 IPv4addr=192.168.23.211/24
IPv4gw=192.168.23.1 IPv4gw=192.168.23.1
dhcpReserv=0 dhcpReserv=0
install_user=pi install_user=pi