autoupdate-server

The autoupdate-server package provides a server that allows Lantern clients to compare their running software version against releases posted at Github, if a new version is available, the autoupdate-server will provide a binary diff that the client can use to patch itself.

Features

• Uses Github releases.
• Generates binary diffs.

Requisites

Make sure you have the bsdiff program installed:

apt-get install -y bsdiff
yum install -y bsdiff
brew install bsdiff

The bsdiff program is used to calculate a binary diff of two files and generate a patch.

In order to sign binary files you'll need a keypair:

openssl genrsa -out private.pem 2048
openssl rsa -in private.pem -out public.pem -pubout

The private key must match the public key set in the autoupdate package configuration.

Deploying

make production to deploy the current code to update.getlantern.org.

To change the rollout rate, i.e., what percentage of valid update requests should get fulfilled, edit bin/entrypoint.sh with the appropriate -r option, commit the change, and make production again.

You can monitor the server in production with:

ssh [email protected]
docker logs autoupdate-server

How to run the autoupdate server

./autoupdate-server -k private.pem

Just testing?

Sure! Use this private key:

-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----

Save it to private.pem and run the server pointing to the autoupdate-server repo that belongs to the getlantern organization:

go run *.go -k private.pem -o getlantern -n autoupdate-server
# 2015/03/13 18:22:41 Starting release manager.
# 2015/03/13 18:22:41 Updating assets...

The private key above matches the public key the https://github.com/getlantern/autoupdate/tree/main/_test_app example uses.

The first time you run the server, it will download all required assets, so you'll probably need to wait a bit before the HTTP server is started.

Once you see the "Starting HTTP server" message you can continue testing a running app.

# 2015/03/13 18:22:43 Starting up HTTP server at :9197.

Testing autoupdates locally

Use the mock build tag to build a binary that mocks Github's API responses.

go build -tags mock github.com/getlantern/autoupdate-server

The you can run this binary using the publicly available private key for testing:

autoupdate-server \
	-k _resources/example-keys/private.key \
	-l 127.0.0.1:9999 \
	-p http://127.0.0.1:9999/ \
	-o getlantern \
	-n lantern

Alternatively, you could use the Makefile script that automatizes this task by using a docker container:

make mock-server
docker logs --tail 20 -f autoupdate-server

Make sure the Lantern binary uses the public key that matches the private key for the mock server by building it with the mockupdate build tag and pointing the update server to http://127.0.0.1:9999:

cd $GOPATH/src/github.com/getlantern/flashlight
go build -o lantern \
-tags mockupdate \
-ldflags="-X github.com/getlantern/flashlight.compileTimePackageVersion=1.0.0 -X github.com/getlantern/flashlight/autoupdate.updateServerURL=http://127.0.0.1:9999" \
github.com/getlantern/flashlight/main

The above command will produce a Lantern binary that will accept an update from a mock server running on localhost.