Po-Yi Chou
undergraduate in EECS in NCTU
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Notes-Android
Problem solution
in adb shell, even w/ root privilege
note that android 10 seems to prevent anything from mounting system as R/W, so solution above may not work anymore.
# mv xxx /system/bin
#mv: /system/bin/xxx: Read-only file system
# mount # to check mount information
# mount -o remount -o rw /
tshark in android
# binary, it require root access with user name "root"
# Note that in some rooted devices, the user name from following command is shell rather than root
# adb shell
# su
# echo $USER # the answer shoud be root
https://github.com/hasanbulat/tshark-arm64
# check esp related option
tshark -G currentprefs | grep 'esp\.'
# esp auto decode if null decryption
tshark -o esp.enable_null_encryption_decode_heuristic:TRUE [other option]
Log in to Termux environment
Termux is a good tool if you need to run program such as python, tshark in android
You can later install tsu to get sudo in Termux
Prerequisite
rooted Android phone
Install Termux from Google Play
In Termux
$ pkg install root-repo # don't append other package here, install it until you succeed
$ pkg install openssh
$ sshd # to kill later, killall sshd
$ mkdir ~/.ssh # do if ~/.ssh not exist
In Linux
$ adb push .ssh/id_rsa.pub /sdcard # generate your own ssh key before
$ adb shell
$ su
# cd /data/data/com.termux/files/home/.ssh/
# cat /sdcard/id_rsa.pub >> authorized_keys
# chmod 600 authorized_keys # do if authorized_keys not 600
To use in Linux
## option 1, plug phone with usb
adb forward tcp:8022 tcp:8022
ssh -p 8022 root@localhost
## option 1, through wifi
ssh root@<local ip address>
To disable SSH host key checking for localhost append following in “~/.ssh/config”
Host localhost
StrictHostKeyChecking no
UserKnownHostsFile=/dev/null
To get sudo
# Magisk user
$ pkg install tsu
# Super SU user
# follow https://gitlab.com/st42/termux-sudo
To install sklearn in termux
$ pkg install python wget proot clang fftw libzmq freetype libpng pkg-config
$ curl -LO https://its-pointless.github.io/setup-pointless-repo.sh
$ bash setup-pointless-repo.sh
$ pkg install openblas gcc-10
$ termux-chroot
$ pip install -U pip
$ pip uninstall joblib
$ pip install joblib==0.11 Cython wheel
$ ln -s /data/data/com.termux/files/usr/bin/gfortran-10 /data/data/com.termux/files/usr/bin/gfortran
$ ln -s /data/data/com.termux/files/usr/lib/libgfortran.so.5 /data/data/com.termux/files/usr/lib/libgfortran.so
# -v for verbose mode to recognize problems if failed
$ NPY_NUM_BUILD_JOBS=1 pip install scikit-learn==0.23.2 -v
adb over WiFi(no root required)
Plug the device to PC through usb.
# list plugged devices,
# K1AXKN01F823YE5 is the ID of device in this case
$ adb devices
List of devices attached
K1AXKN01F823YE5 device
# show ip address of device,
# 192.168.1.125 is the IP of device in this case
$ adb -s K1AXKN01F823YE5 shell ip a show wlan0
22: wlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
link/ether 40:b0:76:bc:39:30 brd ff:ff:ff:ff:ff:ff
inet 192.168.1.125/24 brd 192.168.1.255 scope global wlan0
valid_lft forever preferred_lft forever
inet6 fe80::42b0:76ff:febc:3930/64 scope link
valid_lft forever preferred_lft forever
# restart the adbd daemon listening on TCP on the 5555 port.
$ adb -s K1AXKN01F823YE5 tcpip 5555
# connect to the device via TCP/IP
$ adb connect 192.168.1.125
connected to 192.168.1.125:5555
# show devices adb can find via usb and 192.168.1.125
$ adb devices
List of devices attached
K1AXKN01F823YE5 device
192.168.1.125:5555 device
Now you can connect to the device in following two ways.
# through usb
adb -s K1AXKN01F823YE5 [commands]
# through WiFi
adb -s 192.168.1.125:5555 [commands]
So it’s OK to unplug the usb cable now.
To restart the adbd daemon listening on USB,
# replace [ID of device] by K1AXKN01F823YE5 or 192.168.1.125:5555,
# depending on how the device and the PC are connected
$ adb -s [ID of device] usb
restarting in USB mode