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Both callers already read and used RSH_PORT before dialling. Reading it
a third time inside dial hid the data flow and duplicated the error
path.
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Update rsync to 3.5.0 and Go to 1.26.6. Bound SSH handshakes, pin
host-key types, and build 16 KB-aligned hardened executables.
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ssh.Dial applies its Timeout only to the TCP connect, so a host that
accepts the connection and then stalls the SSH handshake hangs the
sync forever. Dial with a timeout, run the handshake under a deadline,
and clear the deadline once the connection is established.
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A garbage or out-of-range port silently fell back to 22 and connected
to the wrong place; fail loud instead.
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rsh -keygen printed the pubkey but wrote the key pair into a directory,
so generating a key briefly left the plaintext private key on flash,
contradicting the documented invariant that it only ever exists in
memory. -keygen now emits the private key PEM on stdout and nothing
else; the app encrypts it immediately and derives the public key via
-pubkey, reusing the validated import path. Keygen failures now surface
as an error dialog instead of crashing the app from a bare thread.
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A small Android app for one-way folder backup, a KISS alternative to
Syncthing. It bundles rsync (built from pinned source via the NDK) and
a pure-Go SSH transport, both shipped in the APK as lib*.so and run from
the native library directory.
rsend pins the host key, stores the ed25519 identity Keystore-encrypted,
pushes each folder additively or as a mirror, and runs on demand or on a
WiFi-only schedule. The build is self-contained and reproducible: make
setup provisions the toolchain, make builds rsync, rsh, and the APK.
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