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#!/bin/bash
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# https://raspberrypi.stackexchange.com/questions/88954/workaround-for-a-wifi-bridge-on-a-raspberry-pi-with-proxy-arp
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# https://www.willhaley.com/blog/raspberry-pi-wifi-ethernet-bridge/
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# TODO: non-interactive install
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# ==============================================================================
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# Config
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SOURCE=${BASH_SOURCE[0]}
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while [ -L "$SOURCE" ]; do # resolve $SOURCE until the file is no longer a symlink
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DIR=$( cd -P "$( dirname "$SOURCE" )" >/dev/null 2>&1 && pwd )
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SOURCE=$(readlink "$SOURCE")
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[[ $SOURCE != /* ]] && SOURCE=$DIR/$SOURCE # if $SOURCE was a relative symlink, we need to resolve it relative to the path where the symlink file was located
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done
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DIR=$( cd -P "$( dirname "$SOURCE" )" >/dev/null 2>&1 && pwd )
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if [[ -f "$DIR/config.sh" ]]; then
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source "$DIR/config.sh"
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else
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echo "config.sh missing!"
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exit 1
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fi
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# ==============================================================================
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# Setup
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# Must be run as root
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if [ "$(id -u)" -ne 0 ]; then
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echo 'This script must be run as root.' >&2
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exit 1
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fi
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# We only need to get the $WLAN_IFACE IP address and will copy it over to $ETH_IFACE later
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WLAN_IFACE_IP=$(ip -4 -br addr show $WLAN_IFACE | grep -Po "\\d+\\.\\d+\\.\\d+\\.\\d+")
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# ==============================================================================
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# Install stuff
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echo "# INSTALL THINGS #"
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THINGS_TO_INSTALL="parprouted dhcp-helper net-tools"
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if ! $NON_INTERACTIVE; then
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echo "Going to install: $THINGS_TO_INSTALL"
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read -p "Press ENTER to continue or CTRL+C to cancel..."
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fi
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echo -e "\n"
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apt-get install $THINGS_TO_INSTALL
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echo -e "\n\nSetting up services...\n"
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systemctl stop dhcp-helper
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systemctl enable dhcp-helper
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if ! $NON_INTERACTIVE; then
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echo -e "\n\nGoing to replace networking with systemd-networkd."
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read -p "Press ENTER to continue or CTRL+C to cancel..."
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fi
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echo -e "\n"
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apt-get --autoremove -y purge ifupdown dhcpcd5 isc-dhcp-client isc-dhcp-common
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echo -e "\n\nConnecting to WiFi..."
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WPA_SUPP_FILE="/etc/wpa_supplicant/wpa_supplicant-$WLAN_IFACE.conf"
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cat > "$WPA_SUPP_FILE" <<EOF
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ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
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update_config=1
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country=US
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network={
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ssid="$WIFI_SSID"
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scan_ssid=1
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key_mgmt=WPA-EAP
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eap=PEAP
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identity="$WIFI_USERNAME"
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password="$WIFI_PWD"
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phase1="peaplabel=0"
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phase2="auth=MSCHAPV2"
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}
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EOF
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chmod 600 "$WPA_SUPP_FILE"
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echo "Created wpa_supplicant: $WPA_SUPP_FILE"
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systemctl disable wpa_supplicant.service
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systemctl stop wpa_supplicant.service
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systemctl enable --now wpa_supplicant@$WLAN_IFACE.service
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systemctl status --no-pager wpa_supplicant@$WLAN_IFACE.service
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echo ""
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ifconfig $WLAN_IFACE
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echo -e "\n\n"https://raspberrypi.stackexchange.com/questions/88954/workaround-for-a-wifi-bridge-on-a-raspberry-pi-with-proxy-arp
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NET_CONF_FILE="/etc/systemd/network/08-$WLAN_IFACE.network"
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cat > "$NET_CONF_FILE" <<EOF
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[Match]
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Name=$WLAN_IFACE
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[Network]
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IPForward=yes
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DHCP=yes
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# for a static ip address, remove DHCP=yes and modify the following lines:
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#Address=192.168.50.2/24
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#Gateway=192.168.50.1
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#DNS=84.200.69.80 1.1.1.1
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EOF
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echo "Created network config: $WLAN_IFACE"
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echo -e "Finishing systemd-networkd install...\n\n"
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apt-get install -y libnss-resolve
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systemctl enable --now systemd-resolved.service
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ln -sf /run/systemd/resolve/stub-resolv.conf /etc/resolv.conf
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systemctl enable --now systemd-networkd.service
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echo -e "\n\nInstall complete! Ignore any service errors for now..."
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# ==============================================================================
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# Create bridge interface
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echo -e "\n# BRIDGE $WLAN_IFACE TO $ETH_IFACE #"
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# brctl addbr br0
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# brctl addif br0 $WLAN_IFACE
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# brctl addif br0 $ETH_IFACE
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# ip addr flush dev $WLAN_IFACE
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# ip addr flush dev $ETH_IFACE
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# ip link set dev br0 up
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# IP="128.198.192.233"
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# MAC="f0:1f:af:6d:fd:54"
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# ebtables -F
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# ebtables -F -t nat
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# ebtables -t nat -A PREROUTING -i $WLAN_IFACE -j redirect --redirect-target ACCEPT
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# ebtables -t nat -A PREROUTING -i $ETH_IFACE -j redirect --redirect-target ACCEPT
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# This works but nat and is unreliable and breaks DHCP
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# IP_OTHR="128.198.192.233"
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# iptables -F
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# iptables -F -t nat
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# iptables -t nat -A PREROUTING -d $IP_OTHR -i $ETH_IFACE -j DNAT --to-destination $WLAN_IFACE_IP
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# iptables -t nat -A PREROUTING -d $WLAN_IFACE_IP -i $WLAN_IFACE -j DNAT --to-destination $IP_OTHR
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# iptables -t nat -A POSTROUTING -s $WLAN_IFACE_IP -j SNAT --to-source $IP_OTHR
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# iptables -t nat -A POSTROUTING -s $IP_OTHR -j SNAT --to-source $WLAN_IFACE_IP
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# ==============================================================================
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# Set up configs
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echo -e "\n# SET UP CONFIG FILES #"
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sed -i'' 's/#net.ipv4.ip_forward=1/net.ipv4.ip_forward=1/' /etc/sysctl.conf
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sudo sysctl -p /etc/sysctl.conf
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echo "Set net.ipv4.ip_forward=1 in /etc/sysctl.conf"
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DHCP_HELPER_CONF="/etc/default/dhcp-helper"
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for ip in $DHCP_SERVERS; do
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DHCP_SERVERS_CONF+=" -s $ip"
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done
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cat > "$DHCP_HELPER_CONF" <<EOF
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# Relay DHCP requests as broadcast to $WLAN_IFACE
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DHCPHELPER_OPTS="$DHCP_SERVERS_CONF"
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EOF
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echo "Created dhcp-helper config: $DHCP_HELPER_CONF"
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# Enable IP forwarding for $WLAN_IFACE if it's not already enabled.
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# grep '^option ip-forwarding 1$' /etc/dhcpcd.conf || printf "option ip-forwarding 1\n" >> /etc/dhcpcd.conf
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# Disable dhcpcd control of $ETH_IFACE.
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# grep "^denyinterfaces ${ETH_IFACE}\$" /etc/dhcpcd.conf || printf "denyinterfaces $ETH_IFACE\n" >> /etc/dhcpcd.conf
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# Enable avahi reflector if it's not already enabled.
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sed -i'' 's/#enable-reflector=no/enable-reflector=yes/' /etc/avahi/avahi-daemon.conf
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grep '^enable-reflector=yes$' /etc/avahi/avahi-daemon.conf || {
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printf "something went wrong...\n\n"
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printf "Manually set 'enable-reflector=yes in /etc/avahi/avahi-daemon.conf'\n"
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}
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echo "Enabled avahi reflector."
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PARPROUTED_SERVICE="/etc/systemd/system/parprouted.service"
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cat > "$PARPROUTED_SERVICE" <<EOF
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[Unit]
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Description=proxy arp routing service
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Documentation=https://raspberrypi.stackexchange.com/q/88954/79866
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Requires=sys-subsystem-net-devices-$WLAN_IFACE.device
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# dhcpcd.service
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After=sys-subsystem-net-devices-$WLAN_IFACE.device
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# dhcpcd.service
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[Service]
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Type=forking
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# Restart until $WLAN_IFACE gained carrier
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Restart=on-failure
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RestartSec=5
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TimeoutStartSec=30
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# clone the dhcp-allocated IP to $ETH_IFACE so dhcp-helper will relay for the correct subnet
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ExecStartPre=/bin/bash -c '/sbin/ip addr add $WLAN_IFACE_IP/32 dev $ETH_IFACE'
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ExecStartPre=/sbin/ip link set dev $ETH_IFACE up
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ExecStartPre=/sbin/ip link set $WLAN_IFACE promisc on
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ExecStart=-/usr/sbin/parprouted $ETH_IFACE $WLAN_IFACE
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ExecStopPost=/sbin/ip link set $WLAN_IFACE promisc off
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ExecStopPost=/sbin/ip link set dev $ETH_IFACE down
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ExecStopPost=/bin/bash -c '/sbin/ip addr del $WLAN_IFACE_IP/32 dev $ETH_IFACE'
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[Install]
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WantedBy=wpa_supplicant.service
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EOF
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echo "Created systemd service: $PARPROUTED_SERVICE"
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systemctl daemon-reload
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systemctl enable --now parprouted dhcp-helper
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systemctl restart parprouted dhcp-helper
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echo -e "Enabled and started parprouted and dhcp-helper"
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echo -e "Waiting 5 seconds...\n"
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sleep 5
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systemctl status --no-pager parprouted
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systemctl status --no-pager dhcp-helper
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echo -e "\n\n\n==============\nDone!\nNow reboot!"
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@ -0,0 +1,15 @@
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# Interface names
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ETH_IFACE="enp0s31f6"
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WLAN_IFACE="wlxc8d7193710f4"
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# IP address(es) of your DHCP servers. If multiple, separate
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# them with a space.
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DHCP_SERVERS="192.168.1.1 192.168.1.2"
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# RADIUS login
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WIFI_SSID="Example-Network"
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WIFI_USERNAME="username"
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WIFI_PWD="password"
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# Don't prompt the user for confirmation
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NON_INTERACTIVE=false
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