UA4F

中文

Another User Agent faker, allowing users to bypass multi device detection for Campus Network via socks5 proxy.

Inspired by UA3f

Warning

This is a toy project. No ANY guarantees are made regarding performance or stability.

Features

• Better performence (i guess)
• Fully written in rust
• Easy to migrate from ua3f
• Compatible with clash

Principle

It will first grab the first few bytes of the first packet to check if it is http traffic. If so, it will continue to grab a total of about 4k of traffic and modify the User Agent in it.

Install

Using prebuilt package

You can find most common pre-built packages in Release.

Download and install it. Then you are ready to use it.

Build Manually

1. Make sure you have installed latest nightly version of rust toolchain and the target corresponding to the target platform. (E.G: x86_64-unknown-linux-musl for x86_64 OpenWrt platform or x86_64-unknown-linux-gnu for x86_64 GNU/Linux)

2. Clone this project

3. Build with cargo

4. You are ready to use. The build result is usually located in target/TARGET_ARCH/release/ua4f

Example Command

# Assuming you are using rustup to manage rust toolchain
rustup default nightly
rustup add x86_64-unknown-linux-musl

cargo build --release --target x86_64-unknown-linux-musl

Build with OpenWrt

1. Make sure you have installed latest nightly version of rust toolchain and the target corresponding to the target platform and use musl as the C library. (E.G: x86_64-unknown-linux-musl for x86_64 platform)

2. Clone this project into the package/ua4f

3. Enable building luci-compat and ua4f package

4. You are ready to build the image or build the package separately.

Example Command

# Assuming you are using rustup to manage rust toolchain
rustup default nightly
rustup target add x86_64-unknown-linux-musl

echo "CONFIG_PACKAGE_ua4f=y" >> .config
make defconfig

# Build this package only
make package/ua4f/{clean,compile} V=s -j$(nproc)
# or include in the image
make -j$(nproc)

Configure

By Luci

It can easily configured via luci. The configuration page is located at Service -> UA4F

By command

Assuming you are using OpenWrt. You can run these command to configure and start it as background service.

# Custom UA
uci set ua4f.main.ua="Mozilla/5.0 (Window NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/555.66"
# Listen port
uci set ua4f.main.port="1080"
# Bind address
uci set ua4f.main.bind="127.0.0.1"
# Log level
uci set ua4f.main.log_level="info"

# Apply
uci commit ua3f

# Start service
service ua4f enable
service ua4f start

By systemd

For regular distributions (Like Arch Linux), you will most likely use systemd to manage background services.

In this situation, you need to write the systemd service file. But don't worry, I have provided an example file and just modify it according to your needs.

1. Create file in /etc/systemd/system/multi-user.target.wants/ua4f.service

2. Copy these lines below and modify it according your needs.

[Unit]
Description=Another User Agent faker, allowing users to bypass multi device detection for Campus Network via socks5 proxy.
Documentation=https://github.com/qwq233/ua4f/
After=network.target

[Install]
WantedBy=multi-user.target

[Service]
# Configure part
Environment=bind_address=127.0.0.1
Environment=port=1080
Environment=custom_ua=Mozilla/5.0 (Window NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/555.66
Environment=log_level=info

# Prevent writes to /usr, /boot, and /etc
User=nobody
ProtectSystem=full
# Prevent accessing /home, /root and /run/user
ProtectHome=true

# Allow modify log file
ReadWritePaths=-/var/log/

Type=simple

ExecStart=/path/to/ua4f -b "$bind_address" -l "$log_level" -p "$port" -f "$custom_ua"
KillSignal=SIGTERM
Restart=on-abort
RestartSec=5s

3. Enable and start the service

Example Command

# Download the unit file (same content as above)
curl https://github.com/qwq233/UA4F/raw/refs/heads/master/misc/ua4f.service -0 -o /etc/systemd/system/multi-user.target.wants/ua4f.service

# Edit the file
vim /etc/systemd/system/multi-user.target.wants/ua4f.service

# Enable and start the service
systemctl enable ua4f.service
systemctl start ua4f.service

License

AGPL-3.0-or-later

UA4F - Another User Agent faker
Copyright (C) 2024  James Clef <qwq233@qwq2333.top>

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Affero General Public License for more details.

You should have received a copy of the GNU Affero General Public License
along with this program.  If not, see <https://www.gnu.org/licenses/>.

Credit

Some luci code from UA3F

License: GPL-3.0-only

UA3f
Copyright (C) 2024  SunBK201

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <https://www.gnu.org/licenses/>.