Pi-hole/pivpn
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Generate random virtual subnet, avoiding common subnets and those already used by the system

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This commit is contained in:
Orazio 2021-12-25 14:40:37 +01:00
parent 478b8ecb6c
commit 85b3e82274
1 changed files with 38 additions and 8 deletions
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46
auto_install/install.sh
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@ -34,7 +34,7 @@ PKG_INSTALL="${PKG_MANAGER} --yes --no-install-recommends install"
PKG_COUNT="${PKG_MANAGER} -s -o Debug::NoLocking=true upgrade | grep -c ^Inst || true" PKG_COUNT="${PKG_MANAGER} -s -o Debug::NoLocking=true upgrade | grep -c ^Inst || true"
# Dependencies that are required by the script, regardless of the VPN protocol chosen # Dependencies that are required by the script, regardless of the VPN protocol chosen
BASE_DEPS=(git tar curl grep dnsutils whiptail net-tools bsdmainutils bash-completion) BASE_DEPS=(git tar curl grep dnsutils grepcidr whiptail net-tools bsdmainutils bash-completion)
# Dependencies that where actually installed by the script. For example if the script requires # Dependencies that where actually installed by the script. For example if the script requires
# grep and dnsutils but dnsutils is already installed, we save grep here. This way when uninstalling # grep and dnsutils but dnsutils is already installed, we save grep here. This way when uninstalling
@ -1085,13 +1085,44 @@ setVPNDefaultVars(){
fi fi
} }
generateRandomSubnet() {
# Source: https://community.openvpn.net/openvpn/wiki/AvoidRoutingConflicts
declare -a SUBNET_EXCLUDE_LIST=(10.0.0.0/24 10.0.1.0/24 10.1.1.0/24 10.1.10.0/24 10.2.0.0/24 10.8.0.0/24 10.10.1.0/24 10.90.90.0/24 10.100.1.0/24 10.255.255.0/24)
readarray -t CURRENTLY_USED_SUBNETS <<< "$(ip -o addr show | grep -oE '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\/[0-9]{1,2}')"
SUBNET_EXCLUDE_LIST=("${SUBNET_EXCLUDE_LIST[@]}" "${CURRENTLY_USED_SUBNETS[@]}")
local MATCHES
while true; do
MATCHES=0
pivpnNET="10.$((RANDOM%256)).$((RANDOM%256)).0"
for SUB in "${SUBNET_EXCLUDE_LIST[@]}"; do
if grepcidr "${SUB}" <<< "${pivpnNET}/$subnetClass" 2>&1 > /dev/null; then
((MATCHES++))
fi
done
if [ "${MATCHES}" -eq 0 ]; then
break
fi
done
echo "${pivpnNET}"
}
setOpenVPNDefaultVars(){ setOpenVPNDefaultVars(){
pivpnDEV="tun0" pivpnDEV="tun0"
# Allow custom NET via unattend setupVARs file. Use default if not provided. # Allow custom NET via unattend setupVARs file. Use default if not provided.
if [ -z "$pivpnNET" ]; then if [ -z "$pivpnNET" ]; then
pivpnNET="10.8.0.0" pivpnNET="$(generateRandomSubnet)"
fi fi
vpnGw="${pivpnNET/.0.0/.0.1}" vpnGw="${pivpnNET/.0/.1}"
} }
setWireguardDefaultVars(){ setWireguardDefaultVars(){
@ -1101,9 +1132,9 @@ setWireguardDefaultVars(){
pivpnDEV="wg0" pivpnDEV="wg0"
# Allow custom NET via unattend setupVARs file. Use default if not provided. # Allow custom NET via unattend setupVARs file. Use default if not provided.
if [ -z "$pivpnNET" ]; then if [ -z "$pivpnNET" ]; then
pivpnNET="10.6.0.0" pivpnNET="$(generateRandomSubnet)"
fi fi
vpnGw="${pivpnNET/.0.0/.0.1}" vpnGw="${pivpnNET/.0/.1}"
# Allow custom allowed IPs via unattend setupVARs file. Use default if not provided. # Allow custom allowed IPs via unattend setupVARs file. Use default if not provided.
if [ -z "$ALLOWED_IPS" ]; then if [ -z "$ALLOWED_IPS" ]; then
# Forward all traffic through PiVPN (i.e. full-tunnel), may be modified by # Forward all traffic through PiVPN (i.e. full-tunnel), may be modified by
@ -1233,9 +1264,8 @@ installOpenVPN(){
updatePackageCache updatePackageCache
fi fi
# grepcidr is used to redact IPs in the debug log whereas expect is used # Expect is used to feed easy-rsa with passwords
# to feed easy-rsa with passwords PIVPN_DEPS=(openvpn expect)
PIVPN_DEPS=(openvpn grepcidr expect)
installDependentPackages PIVPN_DEPS[@] installDependentPackages PIVPN_DEPS[@]
} }