Corresponding source

Tuno Connect links the GPL-3.0 licensed sing-box engine. This page carries everything needed to rebuild the engine exactly as it is shipped.

Written offer

YOUR SAFETY LTD offers to any possessor of the Tuno Connect object code, for a period of three years from the date of that copy’s distribution, the complete corresponding source code of the GPL-covered components it contains, on a durable medium, for no more than our reasonable cost of physically performing the distribution. Write to support@tunoconnect.app. The same material is published here, which is where we would direct you first.

Upstream source

The engine is built from github.com/SagerNet/sing-box at tag v1.13.12, unmodified. Note that upstream tag v1.13.13 does not build for this target: it raises sing-tun to a revision whose DefaultInterfaceMonitor requires MyInterfaces(), while its own experimental/libbox still implements MyInterface(). Tag v1.13.12 is internally consistent.

Dependency versions

The dependency graph is pinned by the upstream module files, reproduced here exactly as used: go.mod.

Build

Built on macOS with Go 1.24 and the sagernet fork of gomobile. Build tags are reduced from the upstream defaults: Tailscale, Cronet/naive, WireGuard, QUIC and DHCP are not included.

#!/bin/sh
# Reproduces Frameworks/Libbox.xcframework as shipped in Tuno Connect.
set -eu

go install github.com/sagernet/gomobile/cmd/gomobile@latest
go install github.com/sagernet/gomobile/cmd/gobind@latest

git clone --depth 1 --branch v1.13.12 https://github.com/SagerNet/sing-box
cd sing-box

gomobile bind -v \
  -target ios,iossimulator \
  -libname=box \
  -trimpath -buildvcs=false \
  -ldflags "-X github.com/sagernet/sing-box/constant.Version=1.13.12 \
            -X internal/godebug.defaultGODEBUG=multipathtcp=0 \
            -s -w -buildid= -checklinkname=0" \
  -tags "with_gvisor,with_utls,with_clash_api,badlinkname,tfogo_checklinkname0,grpcnotrace" \
  ./experimental/libbox

Downloadable copy: build-libbox.sh.

The app itself

The application code around the engine is our own and is not GPL-licensed; it calls the engine through the Libbox interface that sing-box publishes for this purpose. If you believe a specific part of the combined work should be provided under the GPL, write to support@tunoconnect.app and we will address it.