Add bin/ap-ref.sh
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bin/ap-ref.sh
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252
bin/ap-ref.sh
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#!/bin/bash
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# Created by srepac@kvmnerds.com
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#
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# Filename: hotspot
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VER=1.6
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## CHANGELOG:
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# 1.0 03/02/22 Created
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# 1.1 03/03/22 Added ability to always run services at boot (also otgnet network DHCP entry for dnsmasq)
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# 1.2 03/04/22 Add ap0 interface on top of wlan0 for use as hotspot AP
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# 1.3 03/11/22 Create script/service so that AP starts up on boot and make it easy to change hotspot network
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# 1.4 03/12/22 Updated SSID to be hostname-AP; DNSport pick between 53 and 5553; refactoring
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# 1.5 03/14/22 Use the current nameservers for use with dnsmasq
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# 1.6 03/22/22 Consolidated to one script for usage on both Arch and Raspbian
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#
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# This script was written to allow PiKVM to run its wifi as hotspot AP akin to how GoPro is first configured
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#
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# SSID: $(hostname)-AP
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# Passphrase: pikvmisawesome
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#
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# Hotspot network IP 10.5.4.1/24 DHCP range 10.5.4.10 - 10.5.4.250
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###
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# Change SSID and PASSPHRASE here
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SSID="$(hostname)-AP"
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PASSPHRASE='pikvmisawesome'
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# Replace the first 3 octets of hotspot network here (change it to whatever you want) Default: NETWORK="10.5.4"
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NETWORK="10.5.4"
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###
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: '
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Before running this script, you should connect your wifi to SSID first, and then run this script creating ap0
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... that acts like a wifi hotspot that other systems can connect to.
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In addition, if the pi eth0/wlan0 is connected to internet, the systems connected to the wifi
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... hotspot will also have internet access.
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' ### end of comments ###
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### unblock wifi in the very beginning just in case
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rfkill unblock wifi
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if [[ "$1" == "-h" || "$1" == "--help" ]]; then
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echo "usage: $0 [-f] where -f forces hotspot to run at boot; default is to run on this session only"
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exit 1
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fi
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if [ -e /usr/local/bin/rw ]; then rw; fi
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set -x
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### added 03/14/22 - create list of DNS servers from /etc/resolv.conf
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if [ ! -e /etc/kvmd/custom.dns ]; then
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NAMESERVERS=$( for i in `grep ^nameserver /etc/resolv.conf | awk '{print $2}' | sort -r -u`; do echo -n "$i,"; done | sed 's/,$//' )
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else
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# comma separated list of DNS servers to use
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NAMESERVERS=$( egrep -v '^#' /etc/kvmd/custom.dns )
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fi
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### Added on 03/22/22 to allow usage on both Arch and Debian (Raspbian) ###
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case $( grep ^NAME= /etc/os-release | cut -d'"' -f 2 | cut -d' ' -f1 ) in
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"Arch")
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# Install required packages if not already installed
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if [ $( pacman -Q | grep -wc hostapd ) -ne 1 ]; then
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# first, update db's
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pacman -Syy
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# then, install hostapd and dnsmasq packages
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pacman --noconfirm -S hostapd dnsmasq
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fi
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;;
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"Debian"|"Raspbian")
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# install required packages if not already installed
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if [ $( apt list 2> /dev/null | grep hostapd | grep -cw installed ) -ne 1 ]; then
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# first, update db's
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apt-get update
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# then, install hostapd and dnsmasq packages
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apt-get install -y hostapd dnsmasq wireless-tools iw
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fi
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;;
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*)
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echo "Running on unsupported OS. Exiting."
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exit 1
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;;
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esac
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# Delete and re-create ap0 interface on top of wlan0
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iw dev ap0 del 2> /dev/null
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iw dev wlan0 interface add ap0 type __ap
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# Stop any dnsmasq and hostapd services in case already running
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systemctl disable --now hostapd dnsmasq kvmd-otgnet-dnsmasq
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sed -i 's#^DAEMON_CONF=.*#DAEMON_CONF=/etc/hostapd/hostapd.conf#' /etc/init.d/hostapd
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### Add /var/lib/misc entry in /etc/fstab
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# Required for dnsmasq to keep track of leased IPs and logs
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if [ $( grep -wc misc /etc/fstab ) -ne 1 ]; then
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cat <<FSTAB >> /etc/fstab
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tmpfs /var/lib/misc tmpfs mode=0755 0 0
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FSTAB
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# mount /var/lib/misc
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mount /var/lib/misc
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fi
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# Backup original /etc/dnsmasq.conf
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if [ ! -e /etc/dnsmas.conf.orig ]; then cp /etc/dnsmasq.conf /etc/dnsmasq.conf.orig; fi
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### Create custom /etc/dnsmasq.conf file
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if [[ $( netstat -nap | grep :53\ | grep -v dnsmasq | wc -l ) -eq 0 ]]; then
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# use dnsmasq default port
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DNSPORT=53
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else
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# another dns resolver is listening on port 53, so use different port
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DNSPORT=5553
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fi
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cat <<DNSMASQ > /etc/dnsmasq.conf
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log-facility=/var/lib/misc/dnsmasq.log
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dhcp-range=interface:ap0,${NETWORK}.10,${NETWORK}.250,12h
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port=${DNSPORT} # use this to listen for DNS requests
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dhcp-option=6,${NAMESERVERS}
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log-queries
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DNSMASQ
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ifconfig ap0 down
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ifconfig ap0 up
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ifconfig ap0 ${NETWORK}.1/24
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### Add firewall rule to allow ap0 routed through current default static route interface ###
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iptables -t nat -F
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iptables -F
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# use the first default static route interface
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IFACE=$( ip route | grep default | awk '{print $5}' | head -1 )
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iptables -t nat -A POSTROUTING -o $IFACE -j MASQUERADE
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iptables -A FORWARD -i ap0 -o $IFACE -j ACCEPT
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echo '1' > /proc/sys/net/ipv4/ip_forward
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## Add entry in /etc/dhcpcd.conf so that wifi doesn't get a DHCP address
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if [ $( grep -wc nohook /etc/dhcpcd.conf ) -ne 1 ]; then
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cat <<DHCPCD >> /etc/dhcpcd.conf
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interface ap0
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static ip_address=${NETWORK}.1/24
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nohook wpa_supplicant
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DHCPCD
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fi
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### Add required routed-ap configuration
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if [ ! -e /etc/sysctl.d/routed-ap.conf ]; then
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cat <<ROUTEDAP > /etc/sysctl.d/routed-ap.conf
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# Enable IPv4 routing
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net.ipv4.ip_forward=1
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ROUTEDAP
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fi
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### overwrite /etc/hostapd/hostapd.conf config
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cat <<EOF > /etc/hostapd/hostapd.conf
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country_code=US
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interface=ap0
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driver=nl80211
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channel=1
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hw_mode=g
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macaddr_acl=0
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auth_algs=1
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ignore_broadcast_ssid=0
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ssid=${SSID}
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wpa=2
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wpa_passphrase=${PASSPHRASE}
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wpa_key_mgmt=WPA-PSK
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wpa_pairwise=CCMP
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# Change the broadcasted/multicasted keys after this many seconds.
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wpa_group_rekey=600
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# Change the master key after this many seconds. Master key is used as a basis
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wpa_gmk_rekey=86400
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EOF
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systemctl unmask hostapd
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# If -f (force) option is passed in, then enable services to run at boot
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if [[ "$1" == "-f" || "$1" == "--firstboot" ]]; then
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rm -f /usr/bin/hotspot-enable
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cat <<SCRIPT > /usr/bin/hotspot-enable
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#!/bin/bash
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# Script to enable hotspot at anytime
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set -x
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# Delete and re-create ap0 interface on top of wlan0
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iw dev ap0 del 2> /dev/null
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iw dev wlan0 interface add ap0 type __ap
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ifconfig ap0 down
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ifconfig ap0 up
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ifconfig ap0 ${NETWORK}.1/24
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iptables -t nat -F
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iptables -F
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iptables -t nat -A POSTROUTING -o $IFACE -j MASQUERADE
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iptables -A FORWARD -i ap0 -o $IFACE -j ACCEPT
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echo '1' > /proc/sys/net/ipv4/ip_forward
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systemctl restart hostapd dnsmasq
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SCRIPT
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chmod +x /usr/bin/hotspot-enable
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# Create service file to run hotspot-enable script at boot (that runs with -f option)
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rm -f /usr/lib/systemd/system/hotspot.service
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cat <<FWSVC > /usr/lib/systemd/system/hotspot.service
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[Unit]
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Description=Run Hotspot AP at boot
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After=network.target network-online.target nss-lookup.target
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[Service]
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User=root
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Type=simple
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ExecStart=/usr/bin/hotspot-enable
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[Install]
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WantedBy=multi-user.target
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FWSVC
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# enable and start hotspot.service to start at boot
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systemctl enable --now hotspot.service hostapd dnsmasq
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else
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# disable hotspot.service
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systemctl disable --now hotspot.service
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fi
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# Restat hostapd and dnsmasq so the config changes take effect
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systemctl restart hostapd dnsmasq
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### Added on 03/03/22 -- just in case kvmd-otgnet-dnsmasq was already running
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# fix it by adding entry for usb0 DHCP
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if [ ! -e /usr/bin/otgnet.sh ]; then
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wget -O /usr/bin/otgnet.sh https://kvmnerds.com/PiKVM/otgnet.sh 2> /dev/null
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chmod +x /usr/bin/otgnet.sh
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fi
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/usr/bin/otgnet.sh
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sleep 3
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ip -br a | grep ap0
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iwconfig ap0
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systemctl status hostapd dnsmasq
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if [ -e /usr/local/bin/ro ]; then ro; fi
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