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All Projects → cunnie → sslip.io

cunnie / sslip.io

Licence: Apache-2.0 License
Golang-based DNS server which maps DNS records with embedded IP addresses to those addresses.

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dns-server

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sslip.io

Test Type Status
Production Nameservers ci.nono.io
DNS Server Unit Tests ci.nono.io

sslip.io is a DNS server that maps specially-crafted DNS A records to IP addresses (e.g. "127-0-0-1.sslip.io" maps to 127.0.0.1). It is similar to, and inspired by, xip.io.

If you'd like to use sslip.io as a service, refer to the website (sslip.io) for more information. This README targets developers; the website targets users.

Quick Start

git clone [email protected]:cunnie/sslip.io.git
cd sslip.io/bosh-release/src/sslip.io-dns-server/
sudo go run main.go
 # sudo is required on Linux, but not on macOS, to bind to privileged port 53

In another window:

dig @localhost 192.168.0.1.sslip.io +short
 # should return "192.168.0.1"

Quick Start Tests

go get github.com/onsi/ginkgo/v2/ginkgo
go get github.com/onsi/gomega/...
sudo ~/go/bin/ginkgo -r .
 # sudo is required on Linux, but not on macOS, to bind to privileged port 53

Directory Structure

  • src/ contains the source code to the DNS server.
  • ci/ contains the Concourse continuous integration (CI) pipeline and task.
  • spec/ contains the tests for the production nameservers. To run the tests locally: 
    DOMAIN=sslip.io rspec --format documentation --color spec/
  • k8s/document_root/ contains the HTML content of the sslip.io website. Please run tidy -im -w 120 k8s/document_root/index.html before submitting pull requests.
  • bosh-release/ contains the BOSH release. BOSH is the mechanism we use to deploy the servers, and the sslip.io BOSH release is a packaging of the DNS server (analogous to a .msi, .pkg, .deb or .rpm)

DNS Server

The DNS server is written in Golang and is not configurable without modifying the source:

  • it binds to port 53 (you can't change it)
  • it only binds to UDP (no TCP, sorry)
  • The SOA record is hard-coded with the exception of the MNAME (primary master name server) record, which is set to the queried hostname (e.g. dig big.apple.com @ns-aws.nono.io would return an SOA with an MNAME record of big.apple.com.
  • The NS records are hard-coded (ns-aws.sslip.io, ns-azure.sslip.io, ns-gce.sslip.io)
  • The MX records are hard-coded to the queried hostname with a preference of 0, with the exception of sslip.io itself, which has custom MX records to enable email delivery to ProtonMail
  • There are no SRV records

Acknowledgements

  • Sam Stephenson (xip.io), Roopinder Singh (nip.io), and the other DNS developers out there
  • The contributors (@normanr, @jpambrun come to mind) who improved sslip.io
  • Jenessa Petersen of Let's Encrypt who bumped the rate limits
  • Natalia Ershova of JetBrains who provided a free license for open source development
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