Offloader auf Basis eines Raspberry PI 4B (WireGuard)

Die Liste der SSIDs findet ihr hier:

 # apt install hostapd -y
 # echo 'DAEMON_OPTS="-d"' >> /etc/default/hostapd

Nun legen wir uns eine entsprechende Konfigurationsdatei an.

 # vim /etc/hostapd/hostapd.conf

/etc/hostapd/hostapd.conf

# Django : 2020-12-15
 
ssid=muenchen.freifunk.net/welt
 
country_code=DE
 
interface=wlan0
driver=nl80211
 
macaddr_acl=0
 
logger_syslog=0
logger_syslog_level=4
logger_stdout=-1
logger_stdout_level=0
 
hw_mode=a
wmm_enabled=1
 
# N
ieee80211n=1
require_ht=1
ht_capab=[MAX-AMSDU-3839][HT40+][SHORT-GI-20][SHORT-GI-40][DSSS_CCK-40]
 
# AC
ieee80211ac=1
require_vht=1
ieee80211d=0
ieee80211h=0
vht_capab=[MAX-AMSDU-3839][SHORT-GI-80]
vht_oper_chwidth=1
channel=36
vht_oper_centr_freq_seg0_idx=42

Anschließend aktivieren und starten wir den hostapd-Daemon.

 # systemctl unmask hostapd
 # systemctl enable hostapd
 # systemctl start hostapd

Das Netzwerkinterface wlan0 müssen wir nun noch in die Bridge packen. Dazu passen wir die /etc/rc.local an.

 # vim /etc/rc.local

/etc/rc.local

#!/bin/sh -e
#
# rc.local
#
# This script is executed at the end of each multiuser runlevel.
# Make sure that the script will "exit 0" on success or any other
# value on error.
#
# In order to enable or disable this script just change the execution
# bits.
#
# By default this script does nothing.
 
# Print the IP address
_IP=$(hostname -I) || true
if [ "$_IP" ]; then
  printf "My IP address is %s\n" "$_IP"
fi
# Django : 2020-12-15
sleep 10; /sbin/brctl addif br-welt wlan0
 
exit 0

Am Besten nochmal rebooten um sicher zugehen, dass alles passt, danach einfach mit dem ClientWifi verbinden.

 # systemctl reboot

Angeschlossen wird das Ganze wie folgt:

Als nächstes aktivieren wir die I2C Schnittstelle und installieren die notwendige Software.

 # echo i2c-bcm2708 >> /etc/modules
 # echo i2c-dev >> /etc/modules

 # apt install python3-dev python3-smbus i2c-tools python3-pil python3-pip python3-setuptools python3-rpi.gpio -y

Bevor wir nun einen Reboot durchführen kontrollieren wir noch, ob in der /boot/config.txt das I2C-Interface auch gestartet wird.

 root@raspberrypi:~# vim /boot/config.txt

...

# Uncomment some or all of these to enable the optional hardware interfaces
# Django : 2020-12-15 - für OLED Display Support aktiviert
# default: # dtparam=i2c_arm=on
dtparam=i2c_arm=on

...

Nun am Besten einmal rebooten.

 # systemctl reboot

Danach überprüfen wir ob das Display erkannt wird.

 # i2cdetect -y 1

     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- -- 
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
30: -- -- -- -- -- -- -- -- -- -- -- -- 3c -- -- -- 
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
70: -- -- -- -- -- -- -- --   

Wie man sieht meldet sich das Display unter der Adresse 3c.

Jetzt installieren wir die notwendige Python Bibliotheken um das Display ansteuern zu können.

 # apt install git fonts-freefont-ttf -y
 # cd /usr/local/src/
 # git clone https://github.com/adafruit/Adafruit_Python_SSD1306.git
 # cd Adafruit_Python_SSD1306
 # python3 setup.py install

Anschließend können wir mit ein paar Beispielen probieren ob das Display korrekt funktioniert.

 # cd examples
 # python3 /usr/local/src/Adafruit_Python_SSD1306/examples/stats.py

Auf dem Display werden ein paar Systemdaten angezeigt:

Nachdem alles alles soweit funktioniert, können wir als nächstes das Bandbreiten Skript installieren, welches auch gleichzeitig die verbundenen BATMAN Clients anzeigt.

Anschließend das Python Skript, welches das Display steuert installieren und anpassen.

 # cd /usr/local/src
 # git clone https://github.com/awlx/raspberry-oled-bandwidth
 # cd raspberry-oled-bandwidth

Nun passen wir in dem Script folgende Variabelen unseren Gegebenheiten an:

• wifi : Die definierte Schnittstelle unseres WiFi-Devices
• vpn : VPN Definitionen
• batman : BATMAN Definitionen
• primary_mac : MAC des Ethernet-Ports unseres Raspberry 4 # ip addr show eth0 | grep link/ether

 # vim /usr/local/src/raspberry-oled-bandwidth/bandwidth.py

/usr/local/src/raspberry-oled-bandwidth/bandwidth.py

#
# Inspired by https://github.com/DarrenBeck/rpi-oled-bandwidth and https://photochirp.com/r-pi/use-raspberry-pi-oled-bandwidth-monitor/
#
# Maintained by awlnx - aw@awlnx.space
#
 
import subprocess
import time
import re
import Adafruit_GPIO.SPI as SPI
import Adafruit_SSD1306
from PIL import Image
from PIL import ImageDraw
from PIL import ImageFont
import math
 
# Adjust to your needs
wifi = 'wlan0'
vpn = 'fastd-welt'
batman = 'bat-welt'
# Django : 2020-12-15
# default: primary_mac = 'dc:a6:32:00:6b:59'
primary_mac = 'dc:a6:32:01:7f:f0'
 
# We assume 100mbit/s max bandwidth
maxRateIn = 10000000
maxRateOut = 10000000
PImaxRateIn = 10000000
PImaxRateOut = 10000000
 
### DO NOT EDIT BELOW THIS POINT ###
 
# Raspberry Pi pin configuration:
# Django : 2020-15-12
# default: RST = 24
RST = 'P9_15'
 
# 128x64 display with hardware I2C:
disp = Adafruit_SSD1306.SSD1306_128_64(rst=RST)
 
# Initialize library.
disp.begin()
 
# Clear display.
disp.clear()
disp.display()
 
# Create blank image for drawing.
# Make sure to create image with mode '1' for 1-bit color.
width = disp.width
height = disp.height
image = Image.new('1', (width, height))
 
# Get drawing object to draw on image.
draw = ImageDraw.Draw(image)
 
font = ImageFont.truetype('/usr/share/fonts/truetype/freefont/FreeSans.ttf', 12)
fontsmall = ImageFont.truetype('/usr/share/fonts/truetype/freefont/FreeSans.ttf', 10)
fontverysmall = ImageFont.truetype('/usr/share/fonts/truetype/freefont/FreeSans.ttf', 8)
fontmedium = ImageFont.truetype('/usr/share/fonts/truetype/freefont/FreeSans.ttf', 12)
 
#Display Image
disp.image(image)
disp.display()
 
#Functions
 
def get_network_bytes(interface):
    for line in open('/proc/net/dev', 'r'):
        if interface in line:
            data = line.split('%s:' % interface)[1].split()
            rx_bytes, tx_bytes = (data[0], data[8])
            return (int(rx_bytes), int(tx_bytes))
 
def drawBar (x, barHeight):
    # parameters are x, y, end x, end y
    # draw.rectangle ((x, height - barHeight, x + 10, height -1), outline=255, fill=255)
    draw.rectangle ((x, 32 - barHeight, x + 8, height - 32), outline=255, fill=255)
 
def drawBarLOW (x, barLOWHeight):
        # parameters are x, y, end x, end y
        draw.rectangle ((x, 32 + barLOWHeight, x + 8, height - 32), outline=255, fill=255)
 
def textRate(rate):
    # rate -> raw bitrate
    # Returns: SI formatted bitrate
    if rate == 0:
        return "0B"
    rate = rate * 8
    size_name = (
        "b/s", "kb/s", "mb/s", "gb/s", "tb/s", "pb/s", "eb/s")
    i = int(math.floor(math.log(rate , 1024)))
    p = math.pow(1024, i)
    s = round(rate / p, 1)
    return "%s %s" % (s, size_name[i])
 
lastInBytes = get_network_bytes(vpn)[0];
lastOutBytes = get_network_bytes(vpn)[1];
lastPIInBytes = get_network_bytes(wifi)[0];
lastPIOutBytes = get_network_bytes(wifi)[1];
lastTime = time.time()
 
#timed array vars
timerTime = time.time()
highestSpeedIn = 0
highestSpeedOut = 0
PIhighestSpeedIn = 0
PIhighestSpeedOut = 0
speedArrayIn = []
speedArrayOut = []
PIspeedArrayIn = []
PIspeedArrayOut = []
inMax = 0
outMax = 0
PIinMax = 0
PIoutMax = 0
 
while (1):
    time.sleep(2)
    draw.rectangle((0, 0, width, height), outline=0, fill=0)
 
    now = time.time()
    elapsed = now - lastTime
    lastTime = now
 
    #calculate rates in and out
    inBytes = get_network_bytes(vpn)[0]
    currInBytes = (inBytes - lastInBytes) / elapsed
    lastInBytes = inBytes
 
    outBytes = get_network_bytes(vpn)[1]
    currOutBytes = (outBytes - lastOutBytes) / elapsed
    lastOutBytes = outBytes
 
    PIinBytes = get_network_bytes(wifi)[0]
    currPIInBytes = (PIinBytes - lastPIInBytes) / elapsed
    lastPIInBytes = PIinBytes
 
    PIoutBytes = get_network_bytes(wifi)[1]
    currPIOutBytes = (PIoutBytes - lastPIOutBytes) / elapsed
    lastPIOutBytes = PIoutBytes
 
 
    #max rate last 24 hours calculations
 
    if currInBytes > highestSpeedIn:
        highestSpeedIn = currInBytes
    if currOutBytes > highestSpeedOut:
        highestSpeedOut = currOutBytes
    if currPIInBytes > PIhighestSpeedIn:
        PIhighestSpeedIn = currPIInBytes
    if currPIOutBytes > PIhighestSpeedOut:
        PIhighestSpeedOut = currPIOutBytes
 
    if now > timerTime + 3600:
        print('-----------------------------------------------------------------  time expired')
        timerTime = now
 
        speedArrayIn.append (highestSpeedIn)
        if len (speedArrayIn) > 23:
            del speedArrayIn[0]
        inMax = max(speedArrayIn)
 
        speedArrayOut.append (highestSpeedOut)
        if len (speedArrayOut) > 23:
            del speedArrayOut[0]
        outMax = max(speedArrayOut)
 
        highestSpeedIn = 0
        highestSpeedOut = 0
 
        PIspeedArrayIn.append (PIhighestSpeedIn)
        if len (PIspeedArrayIn) > 23:
            del PIspeedArrayIn[0]
        PIinMax = max(PIspeedArrayIn)
 
        PIspeedArrayOut.append (PIhighestSpeedOut)
        if len (PIspeedArrayOut) > 23:
            del PIspeedArrayOut[0]
        PIoutMax = max(PIspeedArrayOut)
 
        PIhighestSpeedIn = 0
        PIhighestSpeedOut = 0
 
    #adjust these in each loop in case we find a faster speed
    inMax = max(inMax, highestSpeedIn)
    outMax = max(outMax, highestSpeedOut)
    PIinMax = max(PIinMax, PIhighestSpeedIn)
    PIoutMax = max(PIoutMax, PIhighestSpeedOut)
 
    #draw graph
    inHeight = 0.0
    outHeight = 0.0
    PIinHeight = 0.0
    PIoutHeight = 0.0
 
    if currInBytes > 0:
        inHeight = float(currInBytes / maxRateIn) * 32 
 
    if currOutBytes > 0:
        outHeight = float(currOutBytes / maxRateOut) * 32
 
    if currPIInBytes > 0:
        PIinHeight = float(currPIInBytes / PImaxRateIn) * 32
 
    if currPIOutBytes > 0:
        PIoutHeight = float(currPIOutBytes / PImaxRateOut) * 32
 
    drawBar (0, inHeight)
    drawBar (10, PIinHeight)
    drawBarLOW (0, outHeight)
    drawBarLOW (10, PIoutHeight)
    #write rates
    draw.text((26,38), textRate(currInBytes), font=font, fill=255)
    draw.text((26,50), textRate(currOutBytes), font=font, fill=255)
 
    draw.text((81,38), textRate(currPIInBytes), font=font, fill=255)
    draw.text((81,50), textRate(currPIOutBytes), font=font, fill=255)
 
    # Batman Clients
    clients = subprocess.check_output("batctl -m " + batman + " tl | egrep -v '(MainIF|" + primary_mac + ")' | egrep -o '([0-9A-Fa-f]{2}[:-]){5}([0-9A-Fa-f]{2})' | wc -l", shell=True).split().pop()
    draw.text((0,48), "Clients", font=fontverysmall, fill=255)
    draw.text((10,55), clients.decode("utf-8"), font=fontverysmall, fill=255)
 
    #max rates
    draw.text((36,0), "VPN", font=fontsmall, fill=255)
    draw.text((26,10), textRate(inMax), font=fontsmall, fill=255)
    draw.text((26,20), textRate(outMax), font=fontsmall, fill=255)
 
    draw.text((90,0), "Wifi", font=fontsmall, fill=255)
    draw.text((81,10), textRate(PIinMax), font=fontsmall, fill=255)
    draw.text((81,20), textRate(PIoutMax), font=fontsmall, fill=255)
 
    disp.image(image)
    disp.display()

Nun können das Script erst einmal manuell anstarten und prüfen ob die gewünschten Informationen richtig angezeigt werden.

 # /usr/bin/python3 /usr/local/src/raspberry-oled-bandwidth/bandwidth.py

Um nun nicht jedes mal beim Starten des Offloaders/Gateways manuell starten müssen, legen wir uns noch ein systemd-Script an.

 # vim /etc/systemd/system/oled-bandwidth.service

/etc/systemd/system/oled-bandwidth.service

# Django : 2020-12-15
[Unit]
After=network.target
 
[Service]
ExecStart=/usr/bin/python3 /usr/local/src/raspberry-oled-bandwidth/bandwidth.py
 
[Install]
WantedBy=default.target

Anschließend informieren wir unser System über unser definiertes Daemon-Startscript und aktivieren dies auch gleich noch.

 # systemctl daemon-reload
 # systemctl enable oled-bandwidth.service

Zu guter Letzt rebooten wir nun unseren Rechner.

 # systemctl reboot