WiFi

2024-06-09
Secure Your Online Activity With Ufw: Blocking Incoming Connections On All Ports

UFW access control

when using long range public wifi it matters to block every port from incoming connections.

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sudo ufw default deny
sudo ufw prepend reject in on <intetfece name>
sudo ufw restart

when configuration is done, remember to restart ufw and reconnect existing interfaces.

although remote clients are blocked, self-issued connections are not. so be sure to use another computer for testing ufw effectiveness before and after configuration.

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2022-12-05
Raspberry Pi Tweaks

openai says i should edit /etc/wpa_supplicant/wpa_supplicant.conf like this to connect to 5G wifi:

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network={
ssid="<SSID>"
psk="<password>"
frequency=5180
}

also set frequency of wifi card like this:

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sudo ifdown wlan0 && sudo ifup wlan0
sudo iw dev wlan0 set freq 5180

unplug ethernet, then we are golden.

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traceroute baidu.com

how to check avaliable wifi ssids without network-manager:

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sudo iwlist wlan0 scan | grep ESSID

default login (maybe not):

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username: pi
password: raspberry

in order to start sshd, touch ssh under boot partition

recover dhcpcd service:

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sudo systemctl enable dhcpcd.service
sudo systemctl restart dhcpcd.service

config the password with proot -S <path_to_rootfs> -b <boot_partition>:/boot -q qemu-arm /usr/bin/bash and passwd

you’ve installed raspap on this device. you use the default credentials. this shit will not connect to our wifi automatically, thus block your way of running docker containers on it with only macbook.

seriously? do you really need docker on macos? or just on raspberry pi?

change apt sources:

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sudo sed -i 's|raspbian.raspberrypi.org|mirrors.ustc.edu.cn/raspbian|g' /etc/apt/sources.list
sudo sed -i 's|mirrordirector.raspbian.org|mirrors.ustc.edu.cn/raspbian|g' /etc/apt/sources.list
sudo sed -i 's|archive.raspbian.org|mirrors.ustc.edu.cn/raspbian|g' /etc/apt/sources.list
sudo sed -i 's|archive.raspberrypi.org/debian|mirrors.ustc.edu.cn/archive.raspberrypi.org/debian|g' /etc/apt/sources.list.d/raspi.list

using nmcli to scan and connect wifi

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sudo nmcli dev wifi rescan
sudo nmcli dev wifi connect <SSID> password <PASSWORD>

sharing network:

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ssh -R 1080 pi@10.42.0.33

edit /etc/network/interfaces:

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auto lo
iface lo inet loopback
auto eth0
iface eth0 inet static
address 10.42.0.33
netmask 255.255.255.0
gateway 10.42.0.1
allow-hotplug wlan0
auto wlan0
iface wlan0 inet dhcp
#wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf
wpa-ssid "<SSID>"
wpa-psk "<PASSWORD>"

install packages:

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sudo apt-get -o Acquire::http::proxy="socks5h://127.0.0.1:1080/"  -o Acquire::Check-Valid-Until=false -o Acquire::Check-Date=false update --allow-releaseinfo-change
sudo apt-get -o Acquire::http::proxy="socks5h://127.0.0.1:1080/"  -o Acquire::Check-Valid-Until=false -o Acquire::Check-Date=false upgrade -y

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2022-11-04
Adb Wifi Always On

adb over wifi always on

warning: could be dangerous cause adb remote connections seem without any password. consider protect that with some proxy.

turning on:

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setprop service.adb.tcp.port 5555
stop adbd
start adbd

turning off:

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setprop service.adb.tcp.port -1
stop adbd
start adbd

set things under /data/adb/services.d/ and make them executable

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mount -o remount,rw /
# then you can modify /sytem/etc/init.d, but not /system/bin cause it is a copy of /data/system/bin. you should create script there.

create this under /system/etc/init.d/

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service adb_wifi_enable /system/bin/adb_wifi_enable.sh
disabled
oneshot
seclabel u:r:magisk:s0
on property:sys.boot_completed=1
start adb_wifi_enable

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