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MPL-2.0

It's a bird, it's a plane, it's... a self-hosted, pi-hole esque, DNS resolver

serverless-dns is a Pi-Hole esque content-blocking, serverless, stub DNS-over-HTTPS (DoH) and DNS-over-TLS (DoT) resolver. Runs out-of-the-box on Cloudflare Workers, Deno Deploy, Fastly Compute@Edge, and Fly.io. Free tiers of all these services should be enough to cover 10 to 20 devices worth of DNS traffic per month.

The RethinkDNS resolver

RethinkDNS runs serverless-dns in production at these endpoints:

Cloud platform Server locations Protocol Domain Usage
⛅ Cloudflare Workers 280+ (ping) DoH sky.rethinkdns.com configure
🦕 Deno Deploy 30+ (ping) DoH private beta
⏱️ Fastly Compute@Edge 80+ (ping) DoH private beta
🪂 Fly.io 30+ (ping) DoH and DoT max.rethinkdns.com configure

Server-side processing takes from 0 milliseconds (ms) to 2ms (median), and end-to-end latency (varies across regions and networks) is between 10ms to 30ms (median).

Self-host

Cloudflare Workers is the easiest platform to setup serverless-dns:

Deploy to Cloudflare Workers

Deploy to Fastly

For step-by-step instructions, refer:

Platform Difficulty Runtime Doc
⛅ Cloudflare Easy v8 Isolates Hosting on Cloudflare Workers
🦕 Deno.com Moderate Deno Isolates Hosting on Deno.com
⏱️ Fastly Compute@Edge Easy Fastly JS Hosting on Fastly Compute@Edge
🪂 Fly.io Hard Node MicroVM Hosting on Fly.io

To setup blocklists, visit https://<my-domain>.tld/configure from your browser (it should load something similar to RethinkDNS' configure page).

For help or assistance, feel free to open an issue or submit a patch.


Development

OpenSSF Scorecard

Setup

Code:

# navigate to work dir
cd /my/work/dir

# clone this repository
git clone https://github.com/serverless-dns/serverless-dns.git

# navigate to serverless-dns
cd ./serverless-dns

Node:

# install node v19+ via nvm, if required
# https://github.com/nvm-sh/nvm#installing-and-updating
wget -qO- https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.1/install.sh | bash
nvm install --lts

# download dependencies
npm i

# (optional) update dependencies
npm update

# run serverless-dns on node
./run n

# run a clinicjs.org profiler
./run n [cpu|fn|mem]

Deno:

# install deno.land v1.22+
# https://github.com/denoland/deno/#install
curl -fsSL https://deno.land/install.sh | sh

# run serverless-dns on deno
./run d

Fastly:

# install node v18+ via nvm, if required
# install the Fastly CLI
# https://developer.fastly.com/learning/tools/cli

# run serverless-dns on Fastly Compute@Edge
./run f

Wrangler:

# install Cloudflare Workers (cli) aka Wrangler
# https://developers.cloudflare.com/workers/cli-wrangler/install-update
npm i wrangler --save-dev

# run serverless-dns on Cloudflare Workers (cli)
# Make sure to setup Wrangler first:
# https://developers.cloudflare.com/workers/cli-wrangler/authentication
./run w

# profile wrangler with Chrome DevTools
# blog.cloudflare.com/profiling-your-workers-with-wrangler

Code style

Commits on this repository enforces the Google JavaScript style guide (ref: .eslintrc.cjs). A git pre-commit hook that runs linter (eslint) and formatter (prettier) on .js files. Use git commit --no-verify to bypass this hook.

Pull requests are also checked for code style violations and fixed automatically where possible.

Env vars

Configure env.js if you need to tweak the defaults. For Cloudflare Workers, setup env vars in wrangler.toml, instead. For Fastly Compute@Edge, setup env vars in fastly.toml, instead.

Request flow

  1. The request/response flow: client <-> src/server-[node|workers|deno] <-> doh.js <-> plugin.js
  2. The plugin.js flow: user-op.js -> cache-resolver.js -> cc.js -> resolver.js

Auth

serverless-dns supports authentication with an alpha-numeric bearer token for both DoH and DoT. For a token, msg-key (secret), append the output of hex(hmac-sha256(msg-key|domain.tld), msg) to ACCESS_KEYS env var in csv format. Note: msg is currently fixed to sdns-public-auth-info.

  1. DoH: place the msg-key at the end of the blockstamp, like so: 1:1:4AIggAABEGAgAA:<msg-key> (here, 1 is the version, 1:4AIggAABEGAgAA is the blockstamp, <msg-key> is the auth secret, and : is the delimiter).
  2. DoT: place the msg-key at the end of the SNI (domain-name) containing the blockstamp: 1-4abcbaaaaeigaiaa-<msg-key> (here 1 is the version, 4abcbaaaaeigaiaa is the blockstamp, <msg-key> is the auth secret, and - is the delimeter).

If the intention is to use auth with DoT too, keep msg-key shorter (8 to 24 chars), since subdomains may only be 63 chars long in total.

You can generate the access keys for your fork from max.rethinkdns.com, like so:

msgkey="ShortAlphanumericSecret"
domain="my-serverless-dns-domain.tld"
curl 'https://max.rethinkdns.com/genaccesskey?key='"$msgkey"'&dom='"$domain"
# output
# {"accesskey":["my-serverless-dns-domain.tld|deadbeefd3adb33fa2bb33fd3eadf084beef3b152beefdead49bbb2b33fdead83d3adbeefdeadb33f"],"context":"sdns-public-auth-info"}

Logs and Analytics

serverless-dns can be setup to upload logs via Cloudflare Logpush.

  1. Setup a Logpush job:
    CF_ACCOUNT_ID=<hex-cloudflare-account-id>
    CF_API_KEY=<api-key-with-logs-edit-permission-at-account-level>
    R2_BUCKET=<r2-bucket-name>
    R2_ACCESS_KEY=<r2-access-key-for-the-bucket>
    R2_SECRET_KEY=<r2-secret-key-with-read-write-permissions>
    # optional, setup a filter such that only logs form this worker ends up being pushed; but if you
    # do not need a filter on Worker name (script-name), edit the "filter" field below accordingly.
    SCRIPT_NAME=<name-of-the-worker-as-in-wrangler-toml>
    # for more options, ref: developers.cloudflare.com/logs/get-started/api-configuration
    # Logpush API with cURL: developers.cloudflare.com/logs/tutorials/examples/example-logpush-curl
    # Available Logpull fields: developers.cloudflare.com/logs/reference/log-fields/account/workers_trace_events
    curl -s -X POST "https://api.cloudflare.com/client/v4/accounts/${CF_ACCOUNT_ID}/logpush/jobs" \
        -H "Authorization: Bearer ${CF_API_KEY}" \
        -H 'Content-Type: application/json' \
        -d '{
            "name": "dns-logpush",
            "logpull_options": "fields=EventTimestampMs,Outcome,Logs,ScriptName&timestamps=rfc3339",
            "destination_conf": "r2://'"$R2_BUCKET"'/{DATE}?access-key-id='"${R2_ACCESS_KEY}"'&secret-access-key='"${R2_SECRET_KEY}"'&account-id='"{$CF_ACCOUNT_ID}"',
            "dataset": "workers_trace_events",
            "filter": "{\"where\":{\"and\":[{\"key\":\"ScriptName\",\"operator\":\"contains\",\"value\":\"'"${SCRIPT_NAME}"'\"},{\"key\":\"Outcome\",\"operator\":\"eq\",\"value\":\"ok\"}]}}",
            "enabled": true,
            "frequency": "low"
        }'
  2. Set wrangler.toml property logpush = true, which enables Logpush.
  3. (Optional) env var LOG_LEVEL = "logpush", which raises the log-level such that only request and error logs are emitted.
  4. (Optional) Set env var LOGPUSH_SRC = "csv,of,subdomains", which makes log-pusher.js emit request logs only if Workers hostname contains one of the subdomains.

Logs published to R2 can be retrieved either using R2 Workers, the R2 API, or the Logpush API.

Workers Analytics, if enabled, is pushed against a log-key, lid, which if unspecified is set to hostname of the serverless deployment with periods, ., replaced with underscores, _. Auth must be setup when querying for Analytics via the API which returns a json; ex: https://max.rethinkdns.com/1:<optional-stamp>:<msg-key>/analytics?t=<time-interval-in-mins>&f=<field-name>. Possible fields are ip (client ip), qname (dns query name), region (resolver region), qtype (dns query type), dom (top-level domains), ansip (dns answer ips), and cc (ans ip country codes).

Log capture and analytics isn't yet implemented for Fly and Deno Deploy.


A note about runtimes

Deno Deploy (cloud) and Deno (the runtime) do not expose the same API surface (for example, Deno Deploy only supports HTTP/S server-listeners; whereas, Deno suports raw TCP/UDP/TLS in addition to plain HTTP and HTTP/S).

Except on Node, serverless-dns uses DoH upstreams defined by env vars, CF_DNS_RESOLVER_URL / CF_DNS_RESOLVER_URL_2. On Node, the default DNS upstream is 1.1.1.2 (ref) or the recursive DNS resolver at fdaa::3 when running on Fly.io.

The entrypoints for Node and Deno are src/server-node.js, src/server-deno.ts respectively, and both listen for TCP-over-TLS, HTTP/S connections; whereas, the entrypoint for Cloudflare Workers, which only listens over HTTP (cli) or over HTTP/S (prod), is src/server-workers.js; and for Fastly its src/server-fastly.js.

Local (non-prod) setups on Node, key (private) and cert (public chain) files, by default, are read from paths defined in env vars, TLS_KEY_PATH and TLS_CRT_PATH.

Whilst for prod setup on Node (on Fly.io), either TLS_OFFLOAD must be set to true or key and cert must be base64 encoded in env var TLS_CERTKEY (ref), like so:

# EITHER: offload tls to fly.io and set tls_offload to true
TLS_OFFLOAD="true"
# OR: base64 representation of both key (private) and cert (public chain)
TLS_CERTKEY="KEY=b64_key_content\nCRT=b64_cert_content"

For Deno, key and cert files are read from paths defined in env vars, TLS_KEY_PATH and TLS_CRT_PATH (ref).

Process bringup is different for each of these runtimes: For Node, src/core/node/config.js governs the bringup; while for Deno, it is src/core/deno/config.ts, and for Workers it is src/core/workers/config.js. src/system.js pub-sub co-ordinates the bringup phase among various modules.

On Node and Deno, in-process DNS caching is backed by @serverless-dns/lfu-cache; Cloudflare Workers is backed by both Cache Web API and in-process lfu caches. To disable caching altogether on all three platfroms, set env var, PROFILE_DNS_RESOLVES=true.

Cloud

Cloudflare Workers, and Deno Deploy are ephemeral, as in, the "process" that serves client requests is not long-lived, and in fact, two back-to-back requests may be served by two different isolates ("processes"). Fastly Compute@Edge is the also ephemeral but does not use isolates, instead Fastly creates and destroys a wasmtime sandbox for each request. Resolver on Fly.io, running Node, is backed by persistent VMs and is hence longer-lived, like traditional "serverfull" environments.

For Deno Deploy, the code-base is bundled up in a single javascript file with deno bundle and then handed off to Deno.com.

Cloudflare Workers build-time and runtime configurations are defined in wrangler.toml. Webpack5 bundles the files in an ESM module which is then uploaded to Cloudflare by Wrangler.

Fastly Compute@Edge build-time and runtime configurations are defined in fastly.toml. Webpack5 bundles the files in an ESM module which is then compiled to WASM by npx js-compute-runtime and subsequently packaged and published to Fastly Compute@Edge with the Fastly CLI.

For Fly.io, which runs Node, the runtime directives are defined in fly.toml (used by dev and live deployment-types), while deploy directives are in node.Dockerfile. flyctl accordingly sets up serverless-dns on Fly.io's infrastructure.

# build and deploy for cloudflare workers.dev
npm run build
# usually, env-name is prod
npx wrangler publish [-e <env-name>]

# bundle, build, and deploy for fastly compute@edge
# developer.fastly.com/reference/cli/compute/publish
fastly compute publish

# build and deploy to fly.io
npm run build:fly
flyctl deploy --dockerfile node.Dockerfile --config <fly.toml> [-a <app-name>] [--image-label <some-uniq-label>]

For deploys offloading TLS termination to Fly.io (B1 deployment-type), the runtime directives are instead defined in fly.tls.toml, which sets up HTTP2 Cleartext and HTTP/1.1 on port 443, and DNS over TCP on port 853.

Ref: github/workflows.

Blocklists

190+ blocklists are compressed in a Succinct Radix Trie (based on Steve Hanov's impl) with modifications to speed up string search (lookup) at the expense of "succintness". The blocklists are versioned with unix timestamp (defined in src/basicconfig.json downloaded by pre.sh), which is generated once every week, but we'd like to generate 'em daily / hourly, if possible see), and hosted on Cloudflare R2 (env var: CF_BLOCKLIST_URL).

serverless-dns downloads 3 blocklist files required to setup the radix-trie during runtime bring-up or, downloads them lazily, when serving a DNS request.

serverless-dns compiles around ~13M entries (as of Jan 2023) from around 190+ blocklists. These are defined in the serverless-dns/blocklists repository.

Mozilla Public License Version 2.0 ================================== 1. Definitions -------------- 1.1. "Contributor" means each individual or legal entity that creates, contributes to the creation of, or owns Covered Software. 1.2. "Contributor Version" means the combination of the Contributions of others (if any) used by a Contributor and that particular Contributor's Contribution. 1.3. "Contribution" means Covered Software of a particular Contributor. 1.4. "Covered Software" means Source Code Form to which the initial Contributor has attached the notice in Exhibit A, the Executable Form of such Source Code Form, and Modifications of such Source Code Form, in each case including portions thereof. 1.5. "Incompatible With Secondary Licenses" means (a) that the initial Contributor has attached the notice described in Exhibit B to the Covered Software; or (b) that the Covered Software was made available under the terms of version 1.1 or earlier of the License, but not also under the terms of a Secondary License. 1.6. "Executable Form" means any form of the work other than Source Code Form. 1.7. "Larger Work" means a work that combines Covered Software with other material, in a separate file or files, that is not Covered Software. 1.8. "License" means this document. 1.9. "Licensable" means having the right to grant, to the maximum extent possible, whether at the time of the initial grant or subsequently, any and all of the rights conveyed by this License. 1.10. "Modifications" means any of the following: (a) any file in Source Code Form that results from an addition to, deletion from, or modification of the contents of Covered Software; or (b) any new file in Source Code Form that contains any Covered Software. 1.11. "Patent Claims" of a Contributor means any patent claim(s), including without limitation, method, process, and apparatus claims, in any patent Licensable by such Contributor that would be infringed, but for the grant of the License, by the making, using, selling, offering for sale, having made, import, or transfer of either its Contributions or its Contributor Version. 1.12. "Secondary License" means either the GNU General Public License, Version 2.0, the GNU Lesser General Public License, Version 2.1, the GNU Affero General Public License, Version 3.0, or any later versions of those licenses. 1.13. "Source Code Form" means the form of the work preferred for making modifications. 1.14. "You" (or "Your") means an individual or a legal entity exercising rights under this License. For legal entities, "You" includes any entity that controls, is controlled by, or is under common control with You. For purposes of this definition, "control" means (a) the power, direct or indirect, to cause the direction or management of such entity, whether by contract or otherwise, or (b) ownership of more than fifty percent (50%) of the outstanding shares or beneficial ownership of such entity. 2. License Grants and Conditions -------------------------------- 2.1. Grants Each Contributor hereby grants You a world-wide, royalty-free, non-exclusive license: (a) under intellectual property rights (other than patent or trademark) Licensable by such Contributor to use, reproduce, make available, modify, display, perform, distribute, and otherwise exploit its Contributions, either on an unmodified basis, with Modifications, or as part of a Larger Work; and (b) under Patent Claims of such Contributor to make, use, sell, offer for sale, have made, import, and otherwise transfer either its Contributions or its Contributor Version. 2.2. Effective Date The licenses granted in Section 2.1 with respect to any Contribution become effective for each Contribution on the date the Contributor first distributes such Contribution. 2.3. Limitations on Grant Scope The licenses granted in this Section 2 are the only rights granted under this License. No additional rights or licenses will be implied from the distribution or licensing of Covered Software under this License. Notwithstanding Section 2.1(b) above, no patent license is granted by a Contributor: (a) for any code that a Contributor has removed from Covered Software; or (b) for infringements caused by: (i) Your and any other third party's modifications of Covered Software, or (ii) the combination of its Contributions with other software (except as part of its Contributor Version); or (c) under Patent Claims infringed by Covered Software in the absence of its Contributions. This License does not grant any rights in the trademarks, service marks, or logos of any Contributor (except as may be necessary to comply with the notice requirements in Section 3.4). 2.4. Subsequent Licenses No Contributor makes additional grants as a result of Your choice to distribute the Covered Software under a subsequent version of this License (see Section 10.2) or under the terms of a Secondary License (if permitted under the terms of Section 3.3). 2.5. Representation Each Contributor represents that the Contributor believes its Contributions are its original creation(s) or it has sufficient rights to grant the rights to its Contributions conveyed by this License. 2.6. Fair Use This License is not intended to limit any rights You have under applicable copyright doctrines of fair use, fair dealing, or other equivalents. 2.7. Conditions Sections 3.1, 3.2, 3.3, and 3.4 are conditions of the licenses granted in Section 2.1. 3. Responsibilities ------------------- 3.1. Distribution of Source Form All distribution of Covered Software in Source Code Form, including any Modifications that You create or to which You contribute, must be under the terms of this License. You must inform recipients that the Source Code Form of the Covered Software is governed by the terms of this License, and how they can obtain a copy of this License. You may not attempt to alter or restrict the recipients' rights in the Source Code Form. 3.2. Distribution of Executable Form If You distribute Covered Software in Executable Form then: (a) such Covered Software must also be made available in Source Code Form, as described in Section 3.1, and You must inform recipients of the Executable Form how they can obtain a copy of such Source Code Form by reasonable means in a timely manner, at a charge no more than the cost of distribution to the recipient; and (b) You may distribute such Executable Form under the terms of this License, or sublicense it under different terms, provided that the license for the Executable Form does not attempt to limit or alter the recipients' rights in the Source Code Form under this License. 3.3. Distribution of a Larger Work You may create and distribute a Larger Work under terms of Your choice, provided that You also comply with the requirements of this License for the Covered Software. If the Larger Work is a combination of Covered Software with a work governed by one or more Secondary Licenses, and the Covered Software is not Incompatible With Secondary Licenses, this License permits You to additionally distribute such Covered Software under the terms of such Secondary License(s), so that the recipient of the Larger Work may, at their option, further distribute the Covered Software under the terms of either this License or such Secondary License(s). 3.4. Notices You may not remove or alter the substance of any license notices (including copyright notices, patent notices, disclaimers of warranty, or limitations of liability) contained within the Source Code Form of the Covered Software, except that You may alter any license notices to the extent required to remedy known factual inaccuracies. 3.5. Application of Additional Terms You may choose to offer, and to charge a fee for, warranty, support, indemnity or liability obligations to one or more recipients of Covered Software. However, You may do so only on Your own behalf, and not on behalf of any Contributor. You must make it absolutely clear that any such warranty, support, indemnity, or liability obligation is offered by You alone, and You hereby agree to indemnify every Contributor for any liability incurred by such Contributor as a result of warranty, support, indemnity or liability terms You offer. You may include additional disclaimers of warranty and limitations of liability specific to any jurisdiction. 4. Inability to Comply Due to Statute or Regulation --------------------------------------------------- If it is impossible for You to comply with any of the terms of this License with respect to some or all of the Covered Software due to statute, judicial order, or regulation then You must: (a) comply with the terms of this License to the maximum extent possible; and (b) describe the limitations and the code they affect. Such description must be placed in a text file included with all distributions of the Covered Software under this License. Except to the extent prohibited by statute or regulation, such description must be sufficiently detailed for a recipient of ordinary skill to be able to understand it. 5. Termination -------------- 5.1. The rights granted under this License will terminate automatically if You fail to comply with any of its terms. However, if You become compliant, then the rights granted under this License from a particular Contributor are reinstated (a) provisionally, unless and until such Contributor explicitly and finally terminates Your grants, and (b) on an ongoing basis, if such Contributor fails to notify You of the non-compliance by some reasonable means prior to 60 days after You have come back into compliance. Moreover, Your grants from a particular Contributor are reinstated on an ongoing basis if such Contributor notifies You of the non-compliance by some reasonable means, this is the first time You have received notice of non-compliance with this License from such Contributor, and You become compliant prior to 30 days after Your receipt of the notice. 5.2. If You initiate litigation against any entity by asserting a patent infringement claim (excluding declaratory judgment actions, counter-claims, and cross-claims) alleging that a Contributor Version directly or indirectly infringes any patent, then the rights granted to You by any and all Contributors for the Covered Software under Section 2.1 of this License shall terminate. 5.3. In the event of termination under Sections 5.1 or 5.2 above, all end user license agreements (excluding distributors and resellers) which have been validly granted by You or Your distributors under this License prior to termination shall survive termination. ************************************************************************ * * * 6. Disclaimer of Warranty * * ------------------------- * * * * Covered Software is provided under this License on an "as is" * * basis, without warranty of any kind, either expressed, implied, or * * statutory, including, without limitation, warranties that the * * Covered Software is free of defects, merchantable, fit for a * * particular purpose or non-infringing. The entire risk as to the * * quality and performance of the Covered Software is with You. * * Should any Covered Software prove defective in any respect, You * * (not any Contributor) assume the cost of any necessary servicing, * * repair, or correction. This disclaimer of warranty constitutes an * * essential part of this License. No use of any Covered Software is * * authorized under this License except under this disclaimer. * * * ************************************************************************ ************************************************************************ * * * 7. Limitation of Liability * * -------------------------- * * * * Under no circumstances and under no legal theory, whether tort * * (including negligence), contract, or otherwise, shall any * * Contributor, or anyone who distributes Covered Software as * * permitted above, be liable to You for any direct, indirect, * * special, incidental, or consequential damages of any character * * including, without limitation, damages for lost profits, loss of * * goodwill, work stoppage, computer failure or malfunction, or any * * and all other commercial damages or losses, even if such party * * shall have been informed of the possibility of such damages. This * * limitation of liability shall not apply to liability for death or * * personal injury resulting from such party's negligence to the * * extent applicable law prohibits such limitation. Some * * jurisdictions do not allow the exclusion or limitation of * * incidental or consequential damages, so this exclusion and * * limitation may not apply to You. * * * ************************************************************************ 8. Litigation ------------- Any litigation relating to this License may be brought only in the courts of a jurisdiction where the defendant maintains its principal place of business and such litigation shall be governed by laws of that jurisdiction, without reference to its conflict-of-law provisions. Nothing in this Section shall prevent a party's ability to bring cross-claims or counter-claims. 9. Miscellaneous ---------------- This License represents the complete agreement concerning the subject matter hereof. If any provision of this License is held to be unenforceable, such provision shall be reformed only to the extent necessary to make it enforceable. Any law or regulation which provides that the language of a contract shall be construed against the drafter shall not be used to construe this License against a Contributor. 10. Versions of the License --------------------------- 10.1. New Versions Mozilla Foundation is the license steward. Except as provided in Section 10.3, no one other than the license steward has the right to modify or publish new versions of this License. Each version will be given a distinguishing version number. 10.2. Effect of New Versions You may distribute the Covered Software under the terms of the version of the License under which You originally received the Covered Software, or under the terms of any subsequent version published by the license steward. 10.3. Modified Versions If you create software not governed by this License, and you want to create a new license for such software, you may create and use a modified version of this License if you rename the license and remove any references to the name of the license steward (except to note that such modified license differs from this License). 10.4. Distributing Source Code Form that is Incompatible With Secondary Licenses If You choose to distribute Source Code Form that is Incompatible With Secondary Licenses under the terms of this version of the License, the notice described in Exhibit B of this License must be attached. Exhibit A - Source Code Form License Notice ------------------------------------------- This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0. If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/. If it is not possible or desirable to put the notice in a particular file, then You may include the notice in a location (such as a LICENSE file in a relevant directory) where a recipient would be likely to look for such a notice. You may add additional accurate notices of copyright ownership. Exhibit B - "Incompatible With Secondary Licenses" Notice --------------------------------------------------------- This Source Code Form is "Incompatible With Secondary Licenses", as defined by the Mozilla Public License, v. 2.0.

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The RethinkDNS resolver that deploys to Cloudflare Workers, Deno Deploy, and Fly.io 展开 收起
JavaScript 等 4 种语言
MPL-2.0
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