chore(deps): lock file maintenance

| datasource | package        | from  | to    |
| ---------- | -------------- | ----- | ----- |
| crate      | axum-client-ip | 0.7.0 | 1.0.0 |

.editorconfig

@@ -0,0 +1,14 @@
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+
+[*.{nix,toml,json}]
+indent_style = space
+indent_size = 2
+
+[*.rs]
+indent_style = space
+indent_size = 4

.forgejo/workflows/check.yml

@@ -1,14 +1,41 @@
 on: [push]
 jobs:
-  check:
+  check-renovaterc:
     runs-on: nixos
     steps:
-      - uses: https://git.salame.cl/actions/checkout@v4
-      - run: nix --version
-      - run: nix flake check --keep-going --verbose --print-build-logs
+      - uses: https://git.salame.cl/actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
+      - name: Validate renovaterc
+        run: |
+          nix --version
+          nix shell nixpkgs#renovate --command renovate-config-validator
   build:
     runs-on: nixos
     steps:
-      - uses: https://git.salame.cl/actions/checkout@v4
+      - uses: https://git.salame.cl/actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
+      - name: Build Package
+        run: |
+          nix --version
+          nix build --print-build-logs .#
+  test:
+    needs: build # we use the built binaries in the checks
+    runs-on: nixos
+    steps:
+      - uses: https://git.salame.cl/actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
+      - name: Run tests
+        run: |
+          nix --version
+          nix-fast-build --max-jobs 2 --no-nom --skip-cached --no-link \
+            --flake ".#checks.$(nix eval --raw --impure --expr builtins.currentSystem)"
+  report-size:
+    runs-on: nixos
+    needs: build
+    steps:
+      - uses: https://git.salame.cl/actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
       - run: nix --version
-      - run: nix build --print-build-logs .#
+      - name: Generate size report
+        uses: "https://git.salame.cl/jalil/nix-flake-outputs-size@5c40a31e3e2ed0ea28f8ba68deca41d05fdf2e71" # main
+        with:
+          comment-on-pr: ${{ github.ref_name != 'main' }}
+          generate-artifact: ${{ github.ref_name == 'main' }}
+          do-comparison: true
+          job-name: report-size

.forgejo/workflows/update.yml

@@ -1,62 +0,0 @@
-on:
-  workflow_dispatch:
-  schedule:
-    # 03:42 on Saturdays
-    - cron: '42 3 * * 6'
-env:
-  PR_TITLE: Weekly `cargo update` of dependencies
-  PR_MESSAGE: |
-    Automation to keep dependencies in `Cargo.lock` current.
-
-    The following is the output from `cargo update`:
-  COMMIT_MESSAGE: "chore: cargo update \n\n"
-jobs:
-  update-cargo:
-    runs-on: nixos
-    env:
-      BRANCH_NAME: cargo-update
-    steps:
-      - uses: https://git.salame.cl/actions/checkout@v4
-      - run: nix --version
-      - run: nix run .#cargo-update
-      - name: craft PR body and commit message
-        run: |
-          set -xeuo pipefail
-
-          echo "${COMMIT_MESSAGE}" > commit.txt
-          cat cargo_update.log >> commit.txt
-
-          echo "${PR_MESSAGE}" > body.md
-          echo '```txt' >> body.md
-          cat cargo_update.log >> body.md
-          echo '```' >> body.md
-      - name: commit
-        run: |
-          set -xeuo pipefail
-
-          git config user.name forgejo-actions
-          git config user.email forgejo-actions@salame.cl
-          git switch --force-create "$BRANCH_NAME"
-          git add ./Cargo.lock
-          DIFF="$(git diff --staged)"
-          if [[ "$DIFF" == "" ]]; then
-            echo "Cargo.lock was not changed, bailing out and not making a PR"
-            exit 1
-          fi
-          git commit --no-verify --file=commit.txt
-      - name: push
-        run: |
-          set -xeuo pipefail
-          git push --no-verify --force --set-upstream origin "$BRANCH_NAME"
-      - name: open new pull request
-        env:
-          # We have to use a Personal Access Token (PAT) here.
-          # PRs opened from a workflow using the standard `GITHUB_TOKEN` in GitHub Actions
-          # do not automatically trigger more workflows:
-          # https://docs.github.com/en/actions/security-guides/automatic-token-authentication#using-the-github_token-in-a-workflow
-          # GITHUB_TOKEN: ${{ secrets.DEPS_UPDATER_GITHUB_TOKEN }}
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        run: |
-          set -xeuo pipefail
-          tea login add --token "$GITHUB_TOKEN"
-          tea pr create --title "${PR_TITLE}" --description "$(cat body.md)" --repo "$GITHUB_REPOSITORY"

.renovaterc.json

@@ -0,0 +1,44 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "assignees": [
+    "jalil"
+  ],
+  "automerge": true,
+  "automergeStrategy": "auto",
+  "automergeType": "pr",
+  "commitBodyTable": true,
+  "dependencyDashboard": true,
+  "extends": [
+    "config:best-practices"
+  ],
+  "prCreation": "immediate",
+  "cargo": {
+    "commitMessageTopic": "Rust crate {{depName}}",
+    "fileMatch": [
+      "(^|/)Cargo\\.toml$"
+    ],
+    "versioning": "cargo",
+    "enabled": true
+  },
+  "nix": {
+    "fileMatch": [
+      "(^|/)flake\\.nix$"
+    ],
+    "commitMessageTopic": "nixpkgs",
+    "commitMessageExtra": "to {{newValue}}",
+    "enabled": true
+  },
+  "lockFileMaintenance": {
+    "enabled": true,
+    "recreateWhen": "always",
+    "rebaseWhen": "behind-base-branch",
+    "branchTopic": "lock-file-maintenance",
+    "commitMessageAction": "Lock file maintenance",
+    "schedule": [
+      "* 22 * * *"
+    ]
+  },
+  "automergeSchedule": [
+    "* 23 * * *"
+  ]
+}

CHANGELOG.md

@@ -0,0 +1,139 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+## [0.3.6] - 2025-01-26
+
+### 🚀 Features
+
+- *(webnsupdate)* Allow running in IPv4/6 only mode
+- *(module)* Add option for setting --ip-type
+- *(flake)* Add tests for new allowedIPVersion option
+
+## [0.3.5] - 2025-01-23
+
+### 🚀 Features
+
+- *(renovate)* Enable lockFileMaintenance
+- *(webnsupdate)* Add handling for multiple IPs
+- Tune compilation for size
+- *(tests)* Add nginx integration test
+
+### 🐛 Bug Fixes
+
+- *(flake)* Switch to github ref
+- *(renovate)* Switch automergeStrategy to auto
+- *(ci)* Remove update workflow
+- *(typos)* Typos caught more typos :3
+- *(renovate)* Branch creation before automerge
+- *(renovaterc)* Invalid cron syntax
+- *(deps)* Update rust crate clap to v4.5.24
+- *(deps)* Update rust crate tokio to v1.43.0
+- *(deps)* Update rust crate clap to v4.5.25
+- *(deps)* Update rust crate clap to v4.5.26
+- *(flake)* Switch overlay to callPackage
+- *(deps)* Update rust crate clap to v4.5.27
+- *(deps)* Update rust crate axum to v0.8.2
+- *(module)* Test both IPv4 and IPv6
+
+### 🚜 Refactor
+
+- Setup renovate to manage dependencies
+
+### ⚙️ Miscellaneous Tasks
+
+- Update to axum 0.8
+- Parallelize checks
+
+## [0.3.4] - 2024-12-26
+
+### 🐛 Bug Fixes
+
+- *(main)* Add more logging and default to info
+
+## [0.3.3] - 2024-12-22
+
+### 🚀 Features
+
+- *(ci)* Generate package size report
+- Add git-cliff to generate changelogs
+
+### 🐛 Bug Fixes
+
+- *(webnsupdate)* Reduce binary size
+- *(ci)* Remove tea
+
+### ⚙️ Miscellaneous Tasks
+
+- *(flake.lock)* Update inputs
+- Cargo update
+- Generate base changelog
+
+## [0.3.2] - 2024-11-23
+
+### 🚀 Features
+
+- *(ci)* Check depends on build
+- Upgrade clap_verbosity_flag
+- Replace axum-auth with tower_http
+- Release new version
+
+### 🐛 Bug Fixes
+
+- *(clippy)* Enable more lints and fix issues
+
+### 🚜 Refactor
+
+- Reorganize main.rs
+
+### ⚙️ Miscellaneous Tasks
+
+- Cargo update
+- Update flake inputs
+
+## [0.3.1] - 2024-10-28
+
+### 🐛 Bug Fixes
+
+- Overlay was broken T-T
+
+### ⚙️ Miscellaneous Tasks
+
+- Next dev version
+
+## [0.3.0] - 2024-10-28
+
+### 🚀 Features
+
+- *(ci)* Auto-update rust deps
+- Refactor and add ip saving
+- Add -v verbosity flag
+- Use treefmt-nix and split up flake.nix
+- Add NixOS VM tests
+- Switch to crane
+
+### 🐛 Bug Fixes
+
+- *(fmt)* Use nixfmt-rfc-style
+- *(default.nix)* Small issues here and there
+- *(ci)* Do not use a name when logging in
+
+### 🚜 Refactor
+
+- *(flake)* Use flake-parts
+
+### ⚙️ Miscellaneous Tasks
+
+- Updarte deps
+- *(flake.lock)* Update inputs
+- Cargo update
+- Cargo update
+- Cargo update
+
+## [0.2.0] - 2024-06-02
+
+### 💼 Other
+
+- Init at version 0.1.0
+
+<!-- generated by git-cliff -->

Cargo.toml

@@ -1,35 +1,48 @@
-cargo-features = ["codegen-backend"]
-
 [package]
 description = "An HTTP server using HTTP basic auth to make secure calls to nsupdate"
 name = "webnsupdate"
-version = "0.3.0"
+version = "0.3.6"
 edition = "2021"
+license-file = "LICENSE"
+readme = "README.md"
+keywords = ["dns", "dyndns", "dynamic-ip"]
+categories = ["networking", "dns", "dyndns"]
+repository = "https://github.com/jalil-salame/webnsupdate"
+
+[lints.clippy]
+cargo = { level = "warn", priority = -2 }
+multiple_crate_versions = "allow"
+pedantic = { level = "warn", priority = -1 }
 
 [dependencies]
-axum = "0.7"
-axum-auth = { version = "0.7", default-features = false, features = [
-  "auth-basic",
-] }
-axum-client-ip = "0.6"
+axum = "0.8"
+axum-client-ip = "1.0"
 base64 = "0.22"
 clap = { version = "4", features = ["derive", "env"] }
-clap-verbosity-flag = "2"
+clap-verbosity-flag = { version = "3", default-features = false, features = [
+  "tracing",
+] }
 http = "1"
+humantime = "2.2.0"
 miette = { version = "7", features = ["fancy"] }
 ring = { version = "0.17", features = ["std"] }
-tokio = { version = "1", features = [
-  "macros",
-  "rt",
-  "process",
-  "io-util",
-] }
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+thiserror = "2"
+tokio = { version = "1", features = ["macros", "rt", "process", "io-util"] }
+tower-http = { version = "0.6", features = ["validate-request"] }
 tracing = "0.1"
 tracing-subscriber = { version = "0.3", features = ["env-filter"] }
 
 [dev-dependencies]
-insta = "1"
+insta = { version = "=1.42.2", features = ["json"] }
+
+[profile.release]
+opt-level = "s"
+panic = "abort"
+lto = true
+strip = true
+codegen-units = 1
 
 [profile.dev]
 debug = 0
-codegen-backend = "cranelift"

cliff.toml

@@ -0,0 +1,85 @@
+# git-cliff ~ default configuration file
+# https://git-cliff.org/docs/configuration
+#
+# Lines starting with "#" are comments.
+# Configuration options are organized into tables and keys.
+# See documentation for more information on available options.
+
+[changelog]
+# template for the changelog header
+header = """
+# Changelog\n
+All notable changes to this project will be documented in this file.\n
+"""
+# template for the changelog body
+# https://keats.github.io/tera/docs/#introduction
+body = """
+{% if version %}\
+    ## [{{ version | trim_start_matches(pat="v") }}] - {{ timestamp | date(format="%Y-%m-%d") }}
+{% else %}\
+    ## [unreleased]
+{% endif %}\
+{% for group, commits in commits | group_by(attribute="group") %}
+    ### {{ group | striptags | trim | upper_first }}
+    {% for commit in commits %}
+        - {% if commit.scope %}*({{ commit.scope }})* {% endif %}\
+            {% if commit.breaking %}[**breaking**] {% endif %}\
+            {{ commit.message | upper_first }}\
+    {% endfor %}
+{% endfor %}\n
+"""
+# template for the changelog footer
+footer = """
+<!-- generated by git-cliff -->
+"""
+# remove the leading and trailing s
+trim = true
+# postprocessors
+postprocessors = [
+  # { pattern = '<REPO>', replace = "https://github.com/orhun/git-cliff" }, # replace repository URL
+]
+# render body even when there are no releases to process
+# render_always = true
+# output file path
+# output = "test.md"
+
+[git]
+# parse the commits based on https://www.conventionalcommits.org
+conventional_commits = true
+# filter out the commits that are not conventional
+filter_unconventional = true
+# process each line of a commit as an individual commit
+split_commits = false
+# regex for preprocessing the commit messages
+commit_preprocessors = [
+  # Replace issue numbers
+  #{ pattern = '\((\w+\s)?#([0-9]+)\)', replace = "([#${2}](<REPO>/issues/${2}))"},
+  # Check spelling of the commit with https://github.com/crate-ci/typos
+  # If the spelling is incorrect, it will be automatically fixed.
+  #{ pattern = '.*', replace_command = 'typos --write-changes -' },
+]
+# regex for parsing and grouping commits
+commit_parsers = [
+  { message = "^feat", group = "<!-- 0 -->🚀 Features" },
+  { message = "^fix", group = "<!-- 1 -->🐛 Bug Fixes" },
+  { message = "^doc", group = "<!-- 3 -->📚 Documentation" },
+  { message = "^perf", group = "<!-- 4 -->⚡ Performance" },
+  { message = "^refactor", group = "<!-- 2 -->🚜 Refactor" },
+  { message = "^style", group = "<!-- 5 -->🎨 Styling" },
+  { message = "^test", group = "<!-- 6 -->🧪 Testing" },
+  { message = "^chore\\(release\\): prepare for", skip = true },
+  { message = "^chore\\(deps.*\\)", skip = true },
+  { message = "^chore\\(pr\\)", skip = true },
+  { message = "^chore\\(pull\\)", skip = true },
+  { message = "^chore: bump version", skip = true },
+  { message = "^chore|^ci", group = "<!-- 7 -->⚙️ Miscellaneous Tasks" },
+  { body = ".*security", group = "<!-- 8 -->🛡️ Security" },
+  { message = "^revert", group = "<!-- 9 -->◀️ Revert" },
+  { message = ".*", group = "<!-- 10 -->💼 Other" },
+]
+# filter out the commits that are not matched by commit parsers
+filter_commits = false
+# sort the tags topologically
+topo_order = false
+# sort the commits inside sections by oldest/newest order
+sort_commits = "oldest"

default.nix

@@ -0,0 +1,37 @@
+{
+  pkgs ?
+    (builtins.getFlake (builtins.toString ./.)).inputs.nixpkgs.legacyPackages.${builtins.currentSystem},
+  lib ? pkgs.lib,
+  crane ? (builtins.getFlake (builtins.toString ./.)).inputs.crane,
+  pkgSrc ? ./.,
+  mold ? pkgs.mold,
+}:
+let
+  craneLib = crane.mkLib pkgs;
+  src = craneLib.cleanCargoSource pkgSrc;
+
+  commonArgs = {
+    inherit src;
+    strictDeps = true;
+
+    doCheck = false; # tests will be run in the `checks` derivation
+    NEXTEST_HIDE_PROGRESS_BAR = 1;
+    NEXTEST_FAILURE_OUTPUT = "immediate-final";
+
+    nativeBuildInputs = [ mold ];
+
+    meta = {
+      license = lib.licenses.mit;
+      homepage = "https://github.com/jalil-salame/webnsupdate";
+      mainProgram = "webnsupdate";
+    };
+  };
+
+  cargoArtifacts = craneLib.buildDepsOnly commonArgs;
+in
+craneLib.buildPackage (
+  lib.mergeAttrsList [
+    commonArgs
+    { inherit cargoArtifacts; }
+  ]
+)

flake-modules/default.nix

@@ -3,11 +3,18 @@
   imports = [
     inputs.treefmt-nix.flakeModule
     ./package.nix
-    ./overlay.nix
-    ./module.nix
     ./tests.nix
   ];
 
+  flake.nixosModules =
+    let
+      webnsupdate = ../module.nix;
+    in
+    {
+      default = webnsupdate;
+      inherit webnsupdate;
+    };
+
   perSystem =
     { pkgs, ... }:
     {
@@ -23,10 +30,11 @@
       };
 
       devShells.default = pkgs.mkShellNoCC {
-        packages = [
-          pkgs.cargo-insta
-          pkgs.cargo-udeps
-          pkgs.mold
+        packages = with pkgs; [
+          cargo-insta
+          cargo-udeps
+          mold
+          git-cliff
         ];
       };
     };

flake-modules/module.nix

@@ -1,196 +0,0 @@
-let
-  module =
-    {
-      lib,
-      pkgs,
-      config,
-      ...
-    }:
-    let
-      cfg = config.services.webnsupdate;
-      inherit (lib)
-        mkOption
-        mkEnableOption
-        mkPackageOption
-        types
-        ;
-    in
-    {
-      options.services.webnsupdate = mkOption {
-        description = "An HTTP server for nsupdate.";
-        default = { };
-        type = types.submodule {
-          options = {
-            enable = mkEnableOption "webnsupdate";
-            extraArgs = mkOption {
-              description = ''
-                Extra arguments to be passed to the webnsupdate server command.
-              '';
-              type = types.listOf types.str;
-              default = [ ];
-              example = [ "--ip-source" ];
-            };
-            package = mkPackageOption pkgs "webnsupdate" { };
-            bindIp = mkOption {
-              description = ''
-                IP address to bind to.
-
-                Setting it to anything other than localhost is very insecure as
-                `webnsupdate` only supports plain HTTP and should always be behind a
-                reverse proxy.
-              '';
-              type = types.str;
-              default = "localhost";
-              example = "0.0.0.0";
-            };
-            bindPort = mkOption {
-              description = "Port to bind to.";
-              type = types.port;
-              default = 5353;
-            };
-            passwordFile = mkOption {
-              description = ''
-                The file where the password is stored.
-
-                This file can be created by running `webnsupdate mkpasswd $USERNAME $PASSWORD`.
-              '';
-              type = types.path;
-              example = "/secrets/webnsupdate.pass";
-            };
-            keyFile = mkOption {
-              description = ''
-                The TSIG key that `nsupdate` should use.
-
-                This file will be passed to `nsupdate` through the `-k` option, so look
-                at `man 8 nsupdate` for information on the key's format.
-              '';
-              type = types.path;
-              example = "/secrets/webnsupdate.key";
-            };
-            ttl = mkOption {
-              description = "The TTL that should be set on the zone records created by `nsupdate`.";
-              type = types.ints.positive;
-              default = 60;
-              example = 3600;
-            };
-            records = mkOption {
-              description = ''
-                The fqdn of records that should be updated.
-
-                Empty lines will be ignored, but whitespace will not be.
-              '';
-              type = types.nullOr types.lines;
-              default = null;
-              example = ''
-                example.com.
-
-                example.org.
-                ci.example.org.
-              '';
-            };
-            recordsFile = mkOption {
-              description = ''
-                The fqdn of records that should be updated.
-
-                Empty lines will be ignored, but whitespace will not be.
-              '';
-              type = types.nullOr types.path;
-              default = null;
-              example = "/secrets/webnsupdate.records";
-            };
-            user = mkOption {
-              description = "The user to run as.";
-              type = types.str;
-              default = "named";
-            };
-            group = mkOption {
-              description = "The group to run as.";
-              type = types.str;
-              default = "named";
-            };
-          };
-        };
-      };
-
-      config =
-        let
-          recordsFile =
-            if cfg.recordsFile != null then cfg.recordsFile else pkgs.writeText "webnsrecords" cfg.records;
-          args = lib.strings.escapeShellArgs (
-            [
-              "--records"
-              recordsFile
-              "--key-file"
-              cfg.keyFile
-              "--password-file"
-              cfg.passwordFile
-              "--address"
-              cfg.bindIp
-              "--port"
-              (builtins.toString cfg.bindPort)
-              "--ttl"
-              (builtins.toString cfg.ttl)
-              "--data-dir=%S/webnsupdate"
-            ]
-            ++ cfg.extraArgs
-          );
-          cmd = "${lib.getExe cfg.package} ${args}";
-        in
-        lib.mkIf cfg.enable {
-          # warnings =
-          #   lib.optional (!config.services.bind.enable) "`webnsupdate` is expected to be used alongside `bind`. This is an unsopported configuration.";
-          assertions = [
-            {
-              assertion =
-                (cfg.records != null || cfg.recordsFile != null)
-                && !(cfg.records != null && cfg.recordsFile != null);
-              message = "Exactly one of `services.webnsupdate.records` and `services.webnsupdate.recordsFile` must be set.";
-            }
-          ];
-
-          systemd.services.webnsupdate = {
-            description = "Web interface for nsupdate.";
-            wantedBy = [ "multi-user.target" ];
-            after = [
-              "network.target"
-              "bind.service"
-            ];
-            preStart = "${cmd} verify";
-            path = [ pkgs.dig ];
-            startLimitIntervalSec = 60;
-            serviceConfig = {
-              ExecStart = [ cmd ];
-              Type = "exec";
-              Restart = "on-failure";
-              RestartSec = "10s";
-              # User and group
-              User = cfg.user;
-              Group = cfg.group;
-              # Runtime directory and mode
-              RuntimeDirectory = "webnsupdate";
-              RuntimeDirectoryMode = "0750";
-              # Cache directory and mode
-              CacheDirectory = "webnsupdate";
-              CacheDirectoryMode = "0750";
-              # Logs directory and mode
-              LogsDirectory = "webnsupdate";
-              LogsDirectoryMode = "0750";
-              # State directory and mode
-              StateDirectory = "webnsupdate";
-              StateDirectoryMode = "0750";
-              # New file permissions
-              UMask = "0027";
-              # Security
-              NoNewPrivileges = true;
-              ProtectHome = true;
-            };
-          };
-        };
-    };
-in
-{
-  flake.nixosModules = {
-    default = module;
-    webnsupdate = module;
-  };
-}

flake-modules/overlay.nix

@@ -1,5 +0,0 @@
-{
-  flake = {
-    overlays.default = _final: prev: { webnsupdate = prev.callPackage ../default.nix { }; };
-  };
-}

flake-modules/package.nix

@@ -1,7 +1,14 @@
-{ inputs, lib, ... }:
+{ inputs, ... }:
 {
+  flake.overlays.default = final: prev: {
+    webnsupdate = prev.callPackage ../default.nix {
+      inherit (inputs) crane;
+      pkgSrc = inputs.self;
+    };
+  };
+
   perSystem =
-    { pkgs, ... }:
+    { pkgs, lib, ... }:
     let
       craneLib = inputs.crane.mkLib pkgs;
       src = craneLib.cleanCargoSource inputs.self;
@@ -24,46 +31,30 @@
       };
 
       cargoArtifacts = craneLib.buildDepsOnly commonArgs;
-      webnsupdate = craneLib.buildPackage (
-        lib.mergeAttrsList [
-          commonArgs
-          { inherit cargoArtifacts; }
-        ]
-      );
+      withArtifacts = lib.mergeAttrsList [
+        commonArgs
+        { inherit cargoArtifacts; }
+      ];
+      webnsupdate = pkgs.callPackage ../default.nix {
+        inherit (inputs) crane;
+        pkgSrc = inputs.self;
+      };
     in
     {
       checks = {
+        nextest = craneLib.cargoNextest withArtifacts;
         clippy = craneLib.cargoClippy (
           lib.mergeAttrsList [
-            commonArgs
-            {
-              inherit cargoArtifacts;
-              cargoClippyExtraArgs = "--all-targets -- --deny warnings";
-            }
-          ]
-        );
-
-        nextest = craneLib.cargoNextest (
-          lib.mergeAttrsList [
-            commonArgs
-            { inherit cargoArtifacts; }
+            withArtifacts
+            { cargoClippyExtraArgs = "--all-targets -- --deny warnings"; }
           ]
         );
       };
 
       packages = {
         inherit webnsupdate;
+        inherit (pkgs) git-cliff;
         default = webnsupdate;
-        cargo-update = pkgs.writeShellApplication {
-          name = "cargo-update-lockfile";
-          runtimeInputs = with pkgs; [
-            cargo
-            gnused
-          ];
-          text = ''
-            CARGO_TERM_COLOR=never cargo update 2>&1 | sed '/crates.io index/d' | tee -a cargo_update.log
-          '';
-        };
       };
     };
 }

flake-modules/tests.nix

@@ -6,138 +6,337 @@
       checks =
         let
           testDomain = "webnstest.example";
-          dynamicZonesDir = "/var/lib/named/zones";
-          zoneFile = pkgs.writeText "${testDomain}.zoneinfo" ''
-            $ORIGIN .
-            $TTL 60 ; 1 minute
-            ${testDomain} IN SOA ns1.${testDomain}. admin.${testDomain}. (
-                    1            ; serial
-                    21600        ; refresh (6 hours)
-                    3600         ; retry   (1 hour)
-                    604800       ; expire  (1 week)
-                    86400)       ; negative caching TTL (1 day)
+          lastIPPath = "/var/lib/webnsupdate/last-ip.json";
 
-                                      IN  NS    ns1.${testDomain}.
+          zoneFile = pkgs.writeText "${testDomain}.zoneinfo" ''
+            $TTL 600 ; 10 minutes
             $ORIGIN ${testDomain}.
-            ${testDomain}.            IN  A     127.0.0.1
-            ${testDomain}.            IN  AAAA  ::1
-            ns1                       IN  A     127.0.0.1
-            ns1                       IN  AAAA  ::1
-            nsupdate                  IN  A     127.0.0.1
-            nsupdate                  IN  AAAA  ::1
+            @         IN SOA    ns1.${testDomain}. admin.${testDomain}. (
+                          1            ; serial
+                          6h           ; refresh
+                          1h           ; retry
+                          1w           ; expire
+                          1d)          ; negative caching TTL
+
+                      IN  NS    ns1.${testDomain}.
+            @         IN  A     127.0.0.1
+            ns1       IN  A     127.0.0.1
+            nsupdate  IN  A     127.0.0.1
+            @         IN  AAAA  ::1
+            ns1       IN  AAAA  ::1
+            nsupdate  IN  AAAA  ::1
           '';
 
-          webnsupdate-machine = {
-            imports = [ self.nixosModules.webnsupdate ];
-
-            config = {
-              environment.systemPackages = [
-                pkgs.dig
-                pkgs.curl
-              ];
-
-              services = {
-                webnsupdate = {
-                  enable = true;
-                  bindIp = "127.0.0.1";
-                  keyFile = "/etc/bind/rndc.key";
-                  # test:test (user:password)
-                  passwordFile = pkgs.writeText "webnsupdate.pass" "FQoNmuU1BKfg8qsU96F6bK5ykp2b0SLe3ZpB3nbtfZA";
-                  package = self'.packages.webnsupdate;
-                  extraArgs = [
-                    "-vvv" # debug messages
-                    "--ip-source=ConnectInfo"
-                  ];
-                  records = ''
-                    test1.${testDomain}.
-                    test2.${testDomain}.
-                    test3.${testDomain}.
-                  '';
-                };
-
-                bind = {
-                  enable = true;
-                  zones.${testDomain} = {
-                    master = true;
-                    file = "${dynamicZonesDir}/${testDomain}";
-                    extraConfig = ''
-                      allow-update { key rndc-key; };
-                    '';
-                  };
-                };
+          bindDynamicZone =
+            { config, ... }:
+            let
+              bindCfg = config.services.bind;
+              bindData = bindCfg.directory;
+              dynamicZonesDir = "${bindData}/zones";
+            in
+            {
+              services.bind.zones.${testDomain} = {
+                master = true;
+                file = "${dynamicZonesDir}/${testDomain}";
+                extraConfig = ''
+                  allow-update { key rndc-key; };
+                '';
               };
 
               systemd.services.bind.preStart = ''
                 # shellcheck disable=SC2211,SC1127
                 rm -f ${dynamicZonesDir}/* # reset dynamic zones
 
-                ${pkgs.coreutils}/bin/mkdir -m 0755 -p ${dynamicZonesDir}
-                chown "named" ${dynamicZonesDir}
-                chown "named" /var/lib/named
-
+                # create a dynamic zones dir
+                mkdir -m 0755 -p ${dynamicZonesDir}
                 # copy dynamic zone's file to the dynamic zones dir
                 cp ${zoneFile} ${dynamicZonesDir}/${testDomain}
               '';
             };
+
+          webnsupdate-ipv4-machine =
+            { lib, ... }:
+            {
+              imports = [
+                bindDynamicZone
+                self.nixosModules.webnsupdate
+              ];
+
+              config = {
+                environment.systemPackages = [
+                  pkgs.dig
+                  pkgs.curl
+                ];
+
+                services = {
+                  bind.enable = true;
+
+                  webnsupdate = {
+                    enable = true;
+                    package = self'.packages.webnsupdate;
+                    extraArgs = [ "-vvv" ]; # debug messages
+                    settings = {
+                      address = lib.mkDefault "127.0.0.1:5353";
+                      key_file = "/etc/bind/rndc.key";
+                      password_file = pkgs.writeText "webnsupdate.pass" "FQoNmuU1BKfg8qsU96F6bK5ykp2b0SLe3ZpB3nbtfZA"; # test:test
+                      ip_source = lib.mkDefault "ConnectInfo";
+                      records = [
+                        "test1.${testDomain}."
+                        "test2.${testDomain}."
+                        "test3.${testDomain}."
+                      ];
+                    };
+                  };
+                };
+              };
+            };
+
+          webnsupdate-ipv6-machine = {
+            imports = [
+              webnsupdate-ipv4-machine
+            ];
+
+            config.services.webnsupdate.settings.address = "[::1]:5353";
           };
+
+          webnsupdate-nginx-machine =
+            { lib, config, ... }:
+            {
+              imports = [
+                webnsupdate-ipv4-machine
+              ];
+
+              config.services = {
+                # Use default IP Source
+                webnsupdate.settings.ip_source = "RightmostXForwardedFor";
+
+                nginx = {
+                  enable = true;
+                  recommendedProxySettings = true;
+
+                  virtualHosts.webnsupdate.locations."/".proxyPass =
+                    "http://${config.services.webnsupdate.settings.address}";
+                };
+              };
+            };
+
+          webnsupdate-ipv4-only-machine = {
+            imports = [ webnsupdate-nginx-machine ];
+            config.services.webnsupdate.settings.ip_type = "Ipv4Only";
+          };
+
+          webnsupdate-ipv6-only-machine = {
+            imports = [ webnsupdate-nginx-machine ];
+            config.services.webnsupdate.settings.ip_type = "Ipv6Only";
+          };
+
+          # "A" for IPv4, "AAAA" for IPv6, "ANY" for any
+          testTemplate =
+            {
+              ipv4 ? false,
+              ipv6 ? false,
+              nginx ? false,
+              exclusive ? false,
+            }:
+            if exclusive && (ipv4 == ipv6) then
+              builtins.throw "exclusive means one of ipv4 or ipv6 must be set, but not both"
+            else
+              ''
+                IPV4: bool = ${if ipv4 then "True" else "False"}
+                IPV6: bool = ${if ipv6 then "True" else "False"}
+                NGINX: bool = ${if nginx then "True" else "False"}
+                EXCLUSIVE: bool = ${if exclusive then "True" else "False"}
+                print(f"{IPV4=} {IPV6=} {EXCLUSIVE=}")
+
+                CURL: str = "curl --fail --no-progress-meter --show-error"
+
+                machine.start(allow_reboot=True)
+                machine.wait_for_unit("bind.service")
+                machine.wait_for_unit("webnsupdate.service")
+
+                STATIC_DOMAINS: list[str] = ["${testDomain}", "ns1.${testDomain}", "nsupdate.${testDomain}"]
+                DYNAMIC_DOMAINS: list[str] = ["test1.${testDomain}", "test2.${testDomain}", "test3.${testDomain}"]
+
+                def dig_cmd(domain: str, record: str, ip: str | None) -> tuple[str, str]:
+                    match_ip = "" if ip is None else f"\\s\\+600\\s\\+IN\\s\\+{record}\\s\\+{ip}$"
+                    return f"dig @localhost {record} {domain} +noall +answer", f"grep '^{domain}.{match_ip}'"
+
+                def curl_cmd(domain: str, identity: str, path: str, query: dict[str, str]) -> str:
+                    from urllib.parse import urlencode
+                    q= f"?{urlencode(query)}" if query else ""
+                    return f"{CURL} -u {identity} -X GET 'http://{domain}{"" if NGINX else ":5353"}/{path}{q}'"
+
+                def domain_available(domain: str, record: str, ip: str | None=None):
+                    dig, grep = dig_cmd(domain, record, ip)
+                    rc, output = machine.execute(dig)
+                    print(f"{dig}[{rc}]: {output}")
+                    machine.succeed(f"{dig} | {grep}")
+
+                def domain_missing(domain: str, record: str, ip: str | None=None):
+                    dig, grep = dig_cmd(domain, record, ip)
+                    rc, output = machine.execute(dig)
+                    print(f"{dig}[{rc}]: {output}")
+                    machine.fail(f"{dig} | {grep}")
+
+                def update_records(domain: str="localhost", /, *, path: str="update", **kwargs):
+                    machine.succeed(curl_cmd(domain, "test:test", path, kwargs))
+                    machine.succeed("cat ${lastIPPath}")
+
+                def update_records_fail(domain: str="localhost", /, *, identity: str="test:test", path: str="update", **kwargs):
+                    machine.fail(curl_cmd(domain, identity, path, kwargs))
+                    machine.fail("cat ${lastIPPath}")
+
+                def invalid_update(domain: str="localhost"):
+                    update_records_fail(domain, identity="bad_user:test")
+                    update_records_fail(domain, identity="test:bad_pass")
+
+                # Tests
+
+                with subtest("static DNS records are available"):
+                    print(f"{IPV4=} {IPV6=} {EXCLUSIVE=}")
+                    for domain in STATIC_DOMAINS:
+                        domain_available(domain, "A", "127.0.0.1") # IPv4
+                        domain_available(domain, "AAAA", "::1")    # IPv6
+
+                with subtest("dynamic DNS records are missing"):
+                    print(f"{IPV4=} {IPV6=} {EXCLUSIVE=}")
+                    for domain in DYNAMIC_DOMAINS:
+                        domain_missing(domain, "A")    # IPv4
+                        domain_missing(domain, "AAAA") # IPv6
+
+                with subtest("invalid auth fails to update records"):
+                    print(f"{IPV4=} {IPV6=} {EXCLUSIVE=}")
+                    invalid_update()
+                    for domain in DYNAMIC_DOMAINS:
+                        domain_missing(domain, "A")    # IPv4
+                        domain_missing(domain, "AAAA") # IPv6
+
+                if EXCLUSIVE:
+                    with subtest("exclusive IP version fails to update with invalid version"):
+                        print(f"{IPV4=} {IPV6=} {EXCLUSIVE=}")
+                        if IPV6:
+                            update_records_fail("127.0.0.1")
+                        if IPV4:
+                            update_records_fail("[::1]")
+
+                with subtest("valid auth updates records"):
+                    print(f"{IPV4=} {IPV6=} {EXCLUSIVE=}")
+                    if IPV4:
+                        update_records("127.0.0.1")
+                    if IPV6:
+                        update_records("[::1]")
+
+                    for domain in DYNAMIC_DOMAINS:
+                        if IPV4:
+                            domain_available(domain, "A", "127.0.0.1")
+                        elif IPV6 and EXCLUSIVE:
+                            domain_missing(domain, "A")
+
+                        if IPV6:
+                            domain_available(domain, "AAAA", "::1")
+                        elif IPV4 and EXCLUSIVE:
+                            domain_missing(domain, "AAAA")
+
+                with subtest("valid auth fritzbox compatible updates records"):
+                    print(f"{IPV4=} {IPV6=} {EXCLUSIVE=}")
+                    if IPV4 and IPV6:
+                        update_records("127.0.0.1", domain="test", ipv4="1.2.3.4", ipv6="::1234")
+                    elif IPV4:
+                        update_records("127.0.0.1", ipv4="1.2.3.4", ipv6="")
+                    elif IPV6:
+                        update_records("[::1]",     ipv4="",        ipv6="::1234")
+
+                    for domain in DYNAMIC_DOMAINS:
+                        if IPV4:
+                            domain_available(domain, "A", "1.2.3.4")
+                        elif IPV6 and EXCLUSIVE:
+                            domain_missing(domain, "A")
+
+                        if IPV6:
+                            domain_available(domain, "AAAA", "::1234")
+                        elif IPV4 and EXCLUSIVE:
+                            domain_missing(domain, "AAAA")
+
+                with subtest("valid auth replaces records"):
+                    print(f"{IPV4=} {IPV6=} {EXCLUSIVE=}")
+                    if IPV4:
+                        update_records("127.0.0.1")
+                    if IPV6:
+                        update_records("[::1]")
+
+                    for domain in DYNAMIC_DOMAINS:
+                        if IPV4:
+                            domain_available(domain, "A", "127.0.0.1")
+                        elif IPV6 and EXCLUSIVE:
+                            domain_missing(domain, "A")
+
+                        if IPV6:
+                            domain_available(domain, "AAAA", "::1")
+                        elif IPV4 and EXCLUSIVE:
+                            domain_missing(domain, "AAAA")
+
+                machine.reboot()
+                machine.succeed("cat ${lastIPPath}")
+                machine.wait_for_unit("webnsupdate.service")
+                machine.succeed("cat ${lastIPPath}")
+
+                with subtest("static DNS records are available after reboot"):
+                    print(f"{IPV4=} {IPV6=} {EXCLUSIVE=}")
+                    for domain in STATIC_DOMAINS:
+                        domain_available(domain, "A", "127.0.0.1") # IPv4
+                        domain_available(domain, "AAAA", "::1")    # IPv6
+
+                with subtest("dynamic DNS records are available after reboot"):
+                    print(f"{IPV4=} {IPV6=} {EXCLUSIVE=}")
+                    for domain in DYNAMIC_DOMAINS:
+                        if IPV4:
+                            domain_available(domain, "A", "127.0.0.1")
+                        elif IPV6 and EXCLUSIVE:
+                            domain_missing(domain, "A")
+
+                        if IPV6:
+                            domain_available(domain, "AAAA", "::1")
+                        elif IPV4 and EXCLUSIVE:
+                            domain_missing(domain, "AAAA")
+              '';
         in
         {
-          module-test = pkgs.testers.runNixOSTest {
-            name = "webnsupdate-module";
-            nodes.machine = webnsupdate-machine;
-            testScript = ''
-              machine.start(allow_reboot=True)
-              machine.wait_for_unit("webnsupdate.service")
-
-              # ensure base DNS records area available
-              with subtest("query base DNS records"):
-                  machine.succeed("dig @127.0.0.1 ${testDomain} | grep ^${testDomain}")
-                  machine.succeed("dig @127.0.0.1 ns1.${testDomain} | grep ^ns1.${testDomain}")
-                  machine.succeed("dig @127.0.0.1 nsupdate.${testDomain} | grep ^nsupdate.${testDomain}")
-
-              # ensure webnsupdate managed records are missing
-              with subtest("query webnsupdate DNS records (fail)"):
-                  machine.fail("dig @127.0.0.1 test1.${testDomain} | grep ^test1.${testDomain}")
-                  machine.fail("dig @127.0.0.1 test2.${testDomain} | grep ^test2.${testDomain}")
-                  machine.fail("dig @127.0.0.1 test3.${testDomain} | grep ^test3.${testDomain}")
-
-              with subtest("update webnsupdate DNS records (invalid auth)"):
-                  machine.fail("curl --fail --silent -u test1:test1 -X GET http://localhost:5353/update")
-                  machine.fail("cat /var/lib/webnsupdate/last-ip") # no last-ip set yet
-
-              # ensure webnsupdate managed records are missing
-              with subtest("query webnsupdate DNS records (fail)"):
-                  machine.fail("dig @127.0.0.1 test1.${testDomain} | grep ^test1.${testDomain}")
-                  machine.fail("dig @127.0.0.1 test2.${testDomain} | grep ^test2.${testDomain}")
-                  machine.fail("dig @127.0.0.1 test3.${testDomain} | grep ^test3.${testDomain}")
-
-              with subtest("update webnsupdate DNS records (valid auth)"):
-                  machine.succeed("curl --fail --silent -u test:test -X GET http://localhost:5353/update")
-                  machine.succeed("cat /var/lib/webnsupdate/last-ip")
-
-              # ensure webnsupdate managed records are available
-              with subtest("query webnsupdate DNS records (succeed)"):
-                  machine.succeed("dig @127.0.0.1 test1.${testDomain} | grep ^test1.${testDomain}")
-                  machine.succeed("dig @127.0.0.1 test2.${testDomain} | grep ^test2.${testDomain}")
-                  machine.succeed("dig @127.0.0.1 test3.${testDomain} | grep ^test3.${testDomain}")
-
-              machine.reboot()
-              machine.succeed("cat /var/lib/webnsupdate/last-ip")
-              machine.wait_for_unit("webnsupdate.service")
-              machine.succeed("cat /var/lib/webnsupdate/last-ip")
-
-              # ensure base DNS records area available after a reboot
-              with subtest("query base DNS records"):
-                  machine.succeed("dig @127.0.0.1 ${testDomain} | grep ^${testDomain}")
-                  machine.succeed("dig @127.0.0.1 ns1.${testDomain} | grep ^ns1.${testDomain}")
-                  machine.succeed("dig @127.0.0.1 nsupdate.${testDomain} | grep ^nsupdate.${testDomain}")
-
-              # ensure webnsupdate managed records are available after a reboot
-              with subtest("query webnsupdate DNS records (succeed)"):
-                  machine.succeed("dig @127.0.0.1 test1.${testDomain} | grep ^test1.${testDomain}")
-                  machine.succeed("dig @127.0.0.1 test2.${testDomain} | grep ^test2.${testDomain}")
-                  machine.succeed("dig @127.0.0.1 test3.${testDomain} | grep ^test3.${testDomain}")
-            '';
+          module-ipv4-test = pkgs.testers.nixosTest {
+            name = "webnsupdate-ipv4-module";
+            nodes.machine = webnsupdate-ipv4-machine;
+            testScript = testTemplate { ipv4 = true; };
+          };
+          module-ipv6-test = pkgs.testers.nixosTest {
+            name = "webnsupdate-ipv6-module";
+            nodes.machine = webnsupdate-ipv6-machine;
+            testScript = testTemplate { ipv6 = true; };
+          };
+          module-nginx-test = pkgs.testers.nixosTest {
+            name = "webnsupdate-nginx-module";
+            nodes.machine = webnsupdate-nginx-machine;
+            testScript = testTemplate {
+              ipv4 = true;
+              ipv6 = true;
+              nginx = true;
+            };
+          };
+          module-ipv4-only-test = pkgs.testers.nixosTest {
+            name = "webnsupdate-ipv4-only-module";
+            nodes.machine = webnsupdate-ipv4-only-machine;
+            testScript = testTemplate {
+              ipv4 = true;
+              nginx = true;
+              exclusive = true;
+            };
+          };
+          module-ipv6-only-test = pkgs.testers.nixosTest {
+            name = "webnsupdate-ipv6-only-module";
+            nodes.machine = webnsupdate-ipv6-only-machine;
+            testScript = testTemplate {
+              ipv6 = true;
+              nginx = true;
+              exclusive = true;
+            };
           };
         };
     };

flake.lock

@@ -2,11 +2,11 @@
   "nodes": {
     "crane": {
       "locked": {
-        "lastModified": 1730060262,
-        "narHash": "sha256-RMgSVkZ9H03sxC+Vh4jxtLTCzSjPq18UWpiM0gq6shQ=",
+        "lastModified": 1743700120,
+        "narHash": "sha256-8BjG/P0xnuCyVOXlYRwdI1B8nVtyYLf3oDwPSimqREY=",
         "owner": "ipetkov",
         "repo": "crane",
-        "rev": "498d9f122c413ee1154e8131ace5a35a80d8fa76",
+        "rev": "e316f19ee058e6db50075115783be57ac549c389",
         "type": "github"
       },
       "original": {
@@ -22,11 +22,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1727826117,
-        "narHash": "sha256-K5ZLCyfO/Zj9mPFldf3iwS6oZStJcU4tSpiXTMYaaL0=",
+        "lastModified": 1743550720,
+        "narHash": "sha256-hIshGgKZCgWh6AYJpJmRgFdR3WUbkY04o82X05xqQiY=",
         "owner": "hercules-ci",
         "repo": "flake-parts",
-        "rev": "3d04084d54bedc3d6b8b736c70ef449225c361b1",
+        "rev": "c621e8422220273271f52058f618c94e405bb0f5",
         "type": "github"
       },
       "original": {
@@ -37,17 +37,18 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1728492678,
-        "narHash": "sha256-9UTxR8eukdg+XZeHgxW5hQA9fIKHsKCdOIUycTryeVw=",
+        "lastModified": 1743583204,
+        "narHash": "sha256-F7n4+KOIfWrwoQjXrL2wD9RhFYLs2/GGe/MQY1sSdlE=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "5633bcff0c6162b9e4b5f1264264611e950c8ec7",
+        "rev": "2c8d3f48d33929642c1c12cd243df4cc7d2ce434",
         "type": "github"
       },
       "original": {
-        "id": "nixpkgs",
+        "owner": "NixOS",
         "ref": "nixos-unstable",
-        "type": "indirect"
+        "repo": "nixpkgs",
+        "type": "github"
       }
     },
     "root": {
@@ -81,11 +82,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1729613947,
-        "narHash": "sha256-XGOvuIPW1XRfPgHtGYXd5MAmJzZtOuwlfKDgxX5KT3s=",
+        "lastModified": 1743677901,
+        "narHash": "sha256-eWZln+k+L/VHO69tUTzEmgeDWNQNKIpSUa9nqQgBrSE=",
         "owner": "numtide",
         "repo": "treefmt-nix",
-        "rev": "aac86347fb5063960eccb19493e0cadcdb4205ca",
+        "rev": "57dabe2a6255bd6165b2437ff6c2d1f6ee78421a",
         "type": "github"
       },
       "original": {

flake.nix

@@ -6,7 +6,7 @@
       url = "github:hercules-ci/flake-parts";
       inputs.nixpkgs-lib.follows = "nixpkgs";
     };
-    nixpkgs.url = "nixpkgs/nixos-unstable";
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
     systems.url = "github:nix-systems/default";
     treefmt-nix = {
       url = "github:numtide/treefmt-nix";

justfile

@@ -0,0 +1,2 @@
+changelog version:
+	git cliff --unreleased --prepend=CHANGELOG.md --tag='{{ version }}'

module.nix

@@ -0,0 +1,162 @@
+{ lib, pkgs, ... }@args:
+let
+  cfg = args.config.services.webnsupdate;
+  inherit (lib)
+    mkOption
+    mkEnableOption
+    mkPackageOption
+    types
+    ;
+  format = pkgs.formats.json { };
+in
+{
+  options.services.webnsupdate = mkOption {
+    description = "An HTTP server for nsupdate.";
+    default = { };
+    type = types.submodule {
+      options = {
+        enable = mkEnableOption "webnsupdate";
+        extraArgs = mkOption {
+          description = ''
+            Extra arguments to be passed to the webnsupdate server command.
+          '';
+          type = types.listOf types.str;
+          default = [ ];
+          example = [ "--ip-source" ];
+        };
+        package = mkPackageOption pkgs "webnsupdate" { };
+        settings = mkOption {
+          description = "The webnsupdate JSON configuration";
+          default = { };
+          type = types.submodule {
+            freeformType = format.type;
+            options = {
+              address = mkOption {
+                description = ''
+                  IP address and port to bind to.
+
+                  Setting it to anything other than localhost is very
+                  insecure as `webnsupdate` only supports plain HTTP and
+                  should always be behind a reverse proxy.
+                '';
+                type = types.str;
+                default = "127.0.0.1:5353";
+                example = "[::1]:5353";
+              };
+              ip_type = mkOption {
+                description = ''The allowed IP versions to accept updates from.'';
+                type = types.enum [
+                  "Both"
+                  "Ipv4Only"
+                  "Ipv6Only"
+                ];
+                default = "Both";
+                example = "Ipv4Only";
+              };
+              password_file = mkOption {
+                description = ''
+                  The file where the password is stored.
+
+                  This file can be created by running `webnsupdate mkpasswd $USERNAME $PASSWORD`.
+                '';
+                type = types.path;
+                example = "/secrets/webnsupdate.pass";
+              };
+              key_file = mkOption {
+                description = ''
+                  The TSIG key that `nsupdate` should use.
+
+                  This file will be passed to `nsupdate` through the `-k` option, so look
+                  at `man 8 nsupdate` for information on the key's format.
+                '';
+                type = types.path;
+                example = "/secrets/webnsupdate.key";
+              };
+              ttl = mkOption {
+                description = "The TTL that should be set on the zone records created by `nsupdate`.";
+                default = "10m";
+                example = "60s";
+                type = types.str;
+              };
+              records = mkOption {
+                description = ''
+                  The fqdn of records that should be updated.
+
+                  Empty lines will be ignored, but whitespace will not be.
+                '';
+                type = types.listOf types.str;
+                default = [ ];
+                example = [
+                  "example.com."
+                  "example.org."
+                  "ci.example.org."
+                ];
+              };
+            };
+          };
+        };
+        user = mkOption {
+          description = "The user to run as.";
+          type = types.str;
+          default = "named";
+        };
+        group = mkOption {
+          description = "The group to run as.";
+          type = types.str;
+          default = "named";
+        };
+      };
+    };
+  };
+
+  config =
+    let
+      configFile = format.generate "webnsupdate.json" cfg.settings;
+      args = lib.strings.escapeShellArgs ([ "--config=${configFile}" ] ++ cfg.extraArgs);
+      cmd = "${lib.getExe cfg.package} ${args}";
+    in
+    lib.mkIf cfg.enable {
+      # FIXME: re-enable once I stop using the patched version of bind
+      # warnings =
+      #   lib.optional (!config.services.bind.enable) "`webnsupdate` is expected to be used alongside `bind`. This is an unsupported configuration.";
+
+      systemd.services.webnsupdate = {
+        description = "Web interface for nsupdate.";
+        wantedBy = [ "multi-user.target" ];
+        after = [
+          "network.target"
+          "bind.service"
+        ];
+        preStart = "${lib.getExe cfg.package} verify ${configFile}";
+        path = [ pkgs.dig ];
+        startLimitIntervalSec = 60;
+        environment.DATA_DIR = "%S/webnsupdate";
+        serviceConfig = {
+          ExecStart = [ cmd ];
+          Type = "exec";
+          Restart = "on-failure";
+          RestartSec = "10s";
+          # User and group
+          User = cfg.user;
+          Group = cfg.group;
+          # Runtime directory and mode
+          RuntimeDirectory = "webnsupdate";
+          RuntimeDirectoryMode = "0750";
+          # Cache directory and mode
+          CacheDirectory = "webnsupdate";
+          CacheDirectoryMode = "0750";
+          # Logs directory and mode
+          LogsDirectory = "webnsupdate";
+          LogsDirectoryMode = "0750";
+          # State directory and mode
+          StateDirectory = "webnsupdate";
+          StateDirectoryMode = "0750";
+          # New file permissions
+          UMask = "0027";
+          # Security
+          NoNewPrivileges = true;
+          ProtectHome = true;
+        };
+      };
+    };
+}

src/auth.rs

@@ -0,0 +1,104 @@
+use base64::engine::general_purpose::URL_SAFE_NO_PAD;
+use base64::Engine;
+use tower_http::validate_request::ValidateRequestHeaderLayer;
+use tracing::{trace, warn};
+
+use crate::password;
+
+pub fn layer<'a, ResBody>(
+    user_pass_hash: &'a [u8],
+    salt: &'a str,
+) -> ValidateRequestHeaderLayer<Basic<'a, ResBody>> {
+    ValidateRequestHeaderLayer::custom(Basic::new(user_pass_hash, salt))
+}
+
+#[derive(Copy)]
+pub struct Basic<'a, ResBody> {
+    pass: &'a [u8],
+    salt: &'a str,
+    _ty: std::marker::PhantomData<fn() -> ResBody>,
+}
+
+impl<ResBody> std::fmt::Debug for Basic<'_, ResBody> {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.debug_struct("BasicAuth")
+            .field("pass", &self.pass)
+            .field("salt", &self.salt)
+            .field("_ty", &self._ty)
+            .finish()
+    }
+}
+
+impl<ResBody> Clone for Basic<'_, ResBody> {
+    fn clone(&self) -> Self {
+        Self {
+            pass: self.pass,
+            salt: self.salt,
+            _ty: std::marker::PhantomData,
+        }
+    }
+}
+
+impl<'a, ResBody> Basic<'a, ResBody> {
+    pub fn new(pass: &'a [u8], salt: &'a str) -> Self {
+        Self {
+            pass,
+            salt,
+            _ty: std::marker::PhantomData,
+        }
+    }
+
+    fn check_headers(&self, headers: &http::HeaderMap<http::HeaderValue>) -> bool {
+        let Some(auth) = headers.get(http::header::AUTHORIZATION) else {
+            return false;
+        };
+
+        // Poor man's split once: https://doc.rust-lang.org/std/primitive.slice.html#method.split_once
+        let Some(index) = auth.as_bytes().iter().position(|&c| c == b' ') else {
+            return false;
+        };
+        let user_pass = &auth.as_bytes()[index + 1..];
+
+        match base64::engine::general_purpose::URL_SAFE.decode(user_pass) {
+            Ok(user_pass) => {
+                let hashed = password::hash_basic_auth(&user_pass, self.salt);
+                if hashed.as_ref() == self.pass {
+                    return true;
+                }
+                warn!("rejected update");
+                trace!(
+                    "mismatched hashes:\nprovided: {}\nstored:   {}",
+                    URL_SAFE_NO_PAD.encode(hashed.as_ref()),
+                    URL_SAFE_NO_PAD.encode(self.pass),
+                );
+                false
+            }
+            Err(err) => {
+                warn!("received invalid base64 when decoding Basic header: {err}");
+                false
+            }
+        }
+    }
+}
+
+impl<B, ResBody> tower_http::validate_request::ValidateRequest<B> for Basic<'_, ResBody>
+where
+    ResBody: Default,
+{
+    type ResponseBody = ResBody;
+
+    fn validate(
+        &mut self,
+        request: &mut http::Request<B>,
+    ) -> std::result::Result<(), http::Response<Self::ResponseBody>> {
+        if self.check_headers(request.headers()) {
+            return Ok(());
+        }
+
+        let mut res = http::Response::new(ResBody::default());
+        *res.status_mut() = http::status::StatusCode::UNAUTHORIZED;
+        res.headers_mut()
+            .insert(http::header::WWW_AUTHENTICATE, "Basic".parse().unwrap());
+        Err(res)
+    }
+}

src/config.rs

@@ -0,0 +1,253 @@
+use std::{
+    fs::File,
+    net::{IpAddr, Ipv4Addr, Ipv6Addr, SocketAddr},
+    path::PathBuf,
+};
+
+use axum_client_ip::ClientIpSource;
+use miette::{Context, IntoDiagnostic};
+
+#[derive(Debug, Default, Clone, Copy, serde::Deserialize, serde::Serialize)]
+pub enum IpType {
+    #[default]
+    Both,
+    Ipv4Only,
+    Ipv6Only,
+}
+
+impl IpType {
+    pub fn valid_for_type(self, ip: IpAddr) -> bool {
+        match self {
+            IpType::Both => true,
+            IpType::Ipv4Only => ip.is_ipv4(),
+            IpType::Ipv6Only => ip.is_ipv6(),
+        }
+    }
+}
+
+impl std::fmt::Display for IpType {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            IpType::Both => f.write_str("both"),
+            IpType::Ipv4Only => f.write_str("ipv4-only"),
+            IpType::Ipv6Only => f.write_str("ipv6-only"),
+        }
+    }
+}
+
+impl std::str::FromStr for IpType {
+    type Err = miette::Error;
+
+    fn from_str(s: &str) -> std::result::Result<Self, Self::Err> {
+        match s {
+            "both" => Ok(Self::Both),
+            "ipv4-only" => Ok(Self::Ipv4Only),
+            "ipv6-only" => Ok(Self::Ipv6Only),
+            _ => miette::bail!("expected one of 'ipv4-only', 'ipv6-only' or 'both', got '{s}'"),
+        }
+    }
+}
+
+/// Webserver settings
+#[derive(Debug, serde::Deserialize, serde::Serialize)]
+pub struct Server {
+    /// Ip address and port of the server
+    #[serde(default = "default_address")]
+    pub address: SocketAddr,
+}
+
+/// Password settings
+#[derive(Debug, serde::Deserialize, serde::Serialize)]
+pub struct Password {
+    /// File containing password to match against
+    ///
+    /// Should be of the format `username:password` and contain a single password
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub password_file: Option<PathBuf>,
+
+    /// Salt to get more unique hashed passwords and prevent table based attacks
+    #[serde(default = "default_salt")]
+    pub salt: Box<str>,
+}
+
+/// Records settings
+#[derive(Debug, serde::Deserialize, serde::Serialize)]
+pub struct Records {
+    /// Time To Live (in seconds) to set on the DNS records
+    #[serde(
+        default = "default_ttl",
+        serialize_with = "humantime_ser",
+        deserialize_with = "humantime_de"
+    )]
+    pub ttl: humantime::Duration,
+
+    /// List of domain names for which to update the IP when an update is requested
+    #[serde(default, skip_serializing_if = "Vec::is_empty")]
+    #[allow(clippy::struct_field_names)]
+    pub records: Vec<Box<str>>,
+
+    /// If provided, when an IPv6 prefix is provided with an update, this will be used to derive
+    /// the full IPv6 address of the client
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub client_id: Option<Ipv6Addr>,
+
+    /// If a client id is provided the ipv6 update will be ignored (only the prefix will be used).
+    /// This domain will point to the ipv6 address instead of the address derived from the client
+    /// id (usually this is the router).
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub router_domain: Option<Box<str>>,
+
+    /// Set client IP source
+    ///
+    /// see: <https://docs.rs/axum-client-ip/latest/axum_client_ip/enum.ClientIpSource.html>
+    #[serde(default = "default_ip_source")]
+    pub ip_source: ClientIpSource,
+
+    /// Set which IPs to allow updating (ipv4, ipv6 or both)
+    #[serde(default = "default_ip_type")]
+    pub ip_type: IpType,
+
+    /// Keyfile `nsupdate` should use
+    ///
+    /// If specified, then `webnsupdate` must have read access to the file
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub key_file: Option<PathBuf>,
+}
+
+#[derive(Debug, serde::Deserialize, serde::Serialize)]
+pub struct Config {
+    /// Server Configuration
+    #[serde(flatten)]
+    pub server: Server,
+
+    /// Password Configuration
+    #[serde(flatten)]
+    pub password: Password,
+
+    /// Records Configuration
+    #[serde(flatten)]
+    pub records: Records,
+
+    /// The config schema (used for lsp completions)
+    #[serde(default, rename = "$schema", skip_serializing)]
+    pub _schema: serde::de::IgnoredAny,
+}
+
+impl Config {
+    /// Load the configuration without verifying it
+    pub fn load(path: &std::path::Path) -> miette::Result<Self> {
+        serde_json::from_reader::<File, Self>(
+            File::open(path)
+                .into_diagnostic()
+                .wrap_err_with(|| format!("failed open {}", path.display()))?,
+        )
+        .into_diagnostic()
+        .wrap_err_with(|| format!("failed to load configuration from {}", path.display()))
+    }
+
+    /// Ensure only a verified configuration is returned
+    pub fn verified(self) -> miette::Result<Self> {
+        self.verify()?;
+        Ok(self)
+    }
+
+    /// Verify the configuration
+    pub fn verify(&self) -> Result<(), Invalid> {
+        let mut invalid_records: Vec<miette::Error> = self
+            .records
+            .records
+            .iter()
+            .filter_map(|record| crate::records::validate_record_str(record).err())
+            .collect();
+
+        invalid_records.extend(
+            self.records
+                .router_domain
+                .as_ref()
+                .and_then(|domain| crate::records::validate_record_str(domain).err()),
+        );
+
+        let err = Invalid { invalid_records };
+
+        if err.invalid_records.is_empty() {
+            Ok(())
+        } else {
+            Err(err)
+        }
+    }
+}
+
+#[derive(Debug, miette::Diagnostic, thiserror::Error)]
+#[error("the configuration was invalid")]
+pub struct Invalid {
+    #[related]
+    pub invalid_records: Vec<miette::Error>,
+}
+
+// --- Default Values (sadly serde doesn't have a way to specify a constant as a default value) ---
+
+fn default_ttl() -> humantime::Duration {
+    super::DEFAULT_TTL.into()
+}
+
+fn default_salt() -> Box<str> {
+    super::DEFAULT_SALT.into()
+}
+
+fn default_address() -> SocketAddr {
+    SocketAddr::new(IpAddr::V4(Ipv4Addr::LOCALHOST), 5353)
+}
+
+fn default_ip_source() -> ClientIpSource {
+    ClientIpSource::RightmostXForwardedFor
+}
+
+fn default_ip_type() -> IpType {
+    IpType::Both
+}
+
+fn humantime_de<'de, D>(de: D) -> Result<humantime::Duration, D::Error>
+where
+    D: serde::Deserializer<'de>,
+{
+    struct Visitor;
+    impl serde::de::Visitor<'_> for Visitor {
+        type Value = humantime::Duration;
+
+        fn expecting(&self, formatter: &mut std::fmt::Formatter) -> std::fmt::Result {
+            write!(formatter, "a duration (e.g. 5s)")
+        }
+
+        fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
+        where
+            E: serde::de::Error,
+        {
+            v.parse().map_err(E::custom)
+        }
+    }
+    de.deserialize_str(Visitor)
+}
+
+fn humantime_ser<S>(duration: &humantime::Duration, ser: S) -> Result<S::Ok, S::Error>
+where
+    S: serde::Serializer,
+{
+    ser.serialize_str(&duration.to_string())
+}
+
+#[test]
+fn default_values_config_snapshot() {
+    let config: Config = serde_json::from_str("{}").unwrap();
+    insta::assert_json_snapshot!(config, @r#"
+    {
+      "address": "127.0.0.1:5353",
+      "salt": "UpdateMyDNS",
+      "ttl": {
+        "secs": 60,
+        "nanos": 0
+      },
+      "ip_source": "RightmostXForwardedFor",
+      "ip_type": "Both"
+    }
+    "#);
+}

src/main.rs

@@ -1,24 +1,28 @@
 use std::{
-    ffi::OsStr,
     io::ErrorKind,
-    net::{IpAddr, SocketAddr},
+    net::{IpAddr, Ipv4Addr, Ipv6Addr, SocketAddr},
     path::{Path, PathBuf},
-    process::{ExitStatus, Stdio},
     time::Duration,
 };
 
-use axum::{extract::State, routing::get, Json, Router};
-use axum_auth::AuthBasic;
-use axum_client_ip::{SecureClientIp, SecureClientIpSource};
+use axum::{
+    extract::{Query, State},
+    routing::get,
+    Router,
+};
+use axum_client_ip::ClientIp;
 use base64::{engine::general_purpose::URL_SAFE_NO_PAD, Engine};
 use clap::{Parser, Subcommand};
 use clap_verbosity_flag::Verbosity;
+use config::Config;
 use http::StatusCode;
 use miette::{bail, ensure, Context, IntoDiagnostic, Result};
-use tokio::io::AsyncWriteExt;
-use tracing::{debug, error, info, level_filters::LevelFilter, trace, warn};
+use tracing::{debug, error, info};
 use tracing_subscriber::EnvFilter;
 
+mod auth;
+mod config;
+mod nsupdate;
 mod password;
 mod records;
 
@@ -28,77 +32,54 @@ const DEFAULT_SALT: &str = "UpdateMyDNS";
 #[derive(Debug, Parser)]
 struct Opts {
     #[command(flatten)]
-    verbosity: Verbosity,
-
-    /// Ip address of the server
-    #[arg(long, default_value = "127.0.0.1")]
-    address: IpAddr,
-
-    /// Port of the server
-    #[arg(long, default_value_t = 5353)]
-    port: u16,
-
-    /// File containing password to match against
-    ///
-    /// Should be of the format `username:password` and contain a single password
-    #[arg(long)]
-    password_file: Option<PathBuf>,
-
-    /// Salt to get more unique hashed passwords and prevent table based attacks
-    #[arg(long, default_value = DEFAULT_SALT)]
-    salt: String,
-
-    /// Time To Live (in seconds) to set on the DNS records
-    #[arg(long, default_value_t = DEFAULT_TTL.as_secs())]
-    ttl: u64,
+    verbosity: Verbosity<clap_verbosity_flag::InfoLevel>,
 
     /// Data directory
-    #[arg(long, default_value = ".")]
+    #[arg(long, env, default_value = ".")]
     data_dir: PathBuf,
 
-    /// File containing the records that should be updated when an update request is made
-    ///
-    /// There should be one record per line:
-    ///
-    /// ```text
-    /// example.com.
-    /// mail.example.com.
-    /// ```
-    #[arg(long)]
-    records: PathBuf,
-
-    /// Keyfile `nsupdate` should use
-    ///
-    /// If specified, then `webnsupdate` must have read access to the file
-    #[arg(long)]
-    key_file: Option<PathBuf>,
-
     /// Allow not setting a password
     #[arg(long)]
     insecure: bool,
 
-    /// Set client IP source
-    ///
-    /// see: https://docs.rs/axum-client-ip/latest/axum_client_ip/enum.SecureClientIpSource.html
-    #[clap(long, default_value = "RightmostXForwardedFor")]
-    ip_source: SecureClientIpSource,
+    #[clap(flatten)]
+    config_or_command: ConfigOrCommand,
+}
+
+#[derive(clap::Args, Debug)]
+#[group(multiple = false)]
+struct ConfigOrCommand {
+    /// Path to the configuration file
+    #[arg(long, short)]
+    config: Option<PathBuf>,
 
     #[clap(subcommand)]
     subcommand: Option<Cmd>,
 }
 
+impl ConfigOrCommand {
+    pub fn take(&mut self) -> (Option<PathBuf>, Option<Cmd>) {
+        (self.config.take(), self.subcommand.take())
+    }
+}
+
 #[derive(Debug, Subcommand)]
 enum Cmd {
     Mkpasswd(password::Mkpasswd),
-    /// Verify the records file
-    Verify,
+    /// Verify the configuration file
+    Verify {
+        /// Path to the configuration file
+        config: PathBuf,
+    },
 }
 
 impl Cmd {
     pub fn process(self, args: &Opts) -> Result<()> {
         match self {
             Cmd::Mkpasswd(mkpasswd) => mkpasswd.process(args),
-            Cmd::Verify => records::load(&args.records).map(drop),
+            Cmd::Verify { config } => config::Config::load(&config) // load config
+                .and_then(Config::verified) // verify config
+                .map(drop), // ignore config data
         }
     }
 }
@@ -108,23 +89,123 @@ struct AppState<'a> {
     /// TTL set on the Zonefile
     ttl: Duration,
 
-    /// Salt added to the password
-    salt: &'a str,
-
     /// The IN A/AAAA records that should have their IPs updated
     records: &'a [&'a str],
 
     /// The TSIG key file
     key_file: Option<&'a Path>,
 
-    /// The password hash
-    password_hash: Option<&'a [u8]>,
-
     /// The file where the last IP is stored
     ip_file: &'a Path,
+
+    /// Last recorded IPs
+    last_ips: std::sync::Arc<tokio::sync::Mutex<SavedIPs>>,
+
+    /// The IP type for which to allow updates
+    ip_type: config::IpType,
 }
 
-fn load_ip(path: &Path) -> Result<Option<IpAddr>> {
+#[derive(Debug, Default, Clone, serde::Serialize, serde::Deserialize)]
+struct SavedIPs {
+    #[serde(skip_serializing_if = "Option::is_none")]
+    ipv4: Option<Ipv4Addr>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    ipv6: Option<Ipv6Addr>,
+}
+
+impl SavedIPs {
+    fn update(&mut self, ip: IpAddr) {
+        match ip {
+            IpAddr::V4(ipv4_addr) => self.ipv4 = Some(ipv4_addr),
+            IpAddr::V6(ipv6_addr) => self.ipv6 = Some(ipv6_addr),
+        }
+    }
+
+    fn ips(&self) -> impl Iterator<Item = IpAddr> {
+        self.ipv4
+            .map(IpAddr::V4)
+            .into_iter()
+            .chain(self.ipv6.map(IpAddr::V6))
+    }
+
+    fn from_str(data: &str) -> miette::Result<Self> {
+        match data.parse::<IpAddr>() {
+            // Old format
+            Ok(IpAddr::V4(ipv4)) => Ok(Self {
+                ipv4: Some(ipv4),
+                ipv6: None,
+            }),
+            Ok(IpAddr::V6(ipv6)) => Ok(Self {
+                ipv4: None,
+                ipv6: Some(ipv6),
+            }),
+            Err(_) => serde_json::from_str(data).into_diagnostic(),
+        }
+    }
+}
+
+impl AppState<'static> {
+    fn from_args(args: &Opts, config: &config::Config) -> miette::Result<Self> {
+        let Opts {
+            verbosity: _,
+            data_dir,
+            insecure,
+            config_or_command: _,
+        } = args;
+
+        let config::Records {
+            ttl,
+            records,
+            client_id: _,
+            router_domain: _,
+            ip_source: _,
+            ip_type,
+            key_file,
+        } = &config.records;
+
+        // Use last registered IP address if available
+        let ip_file = Box::leak(data_dir.join("last-ip.json").into_boxed_path());
+
+        // Leak DNS records
+        let records: &[&str] = &*Vec::leak(
+            records
+                .iter()
+                .map(|record| &*Box::leak(record.clone()))
+                .collect(),
+        );
+
+        let state = AppState {
+            ttl: **ttl,
+            records,
+            // Load keyfile
+            key_file: key_file
+                .as_deref()
+                .map(|path| -> miette::Result<_> {
+                    std::fs::File::open(path)
+                        .into_diagnostic()
+                        .wrap_err_with(|| {
+                            format!("{} is not readable by the current user", path.display())
+                        })?;
+                    Ok(&*Box::leak(path.into()))
+                })
+                .transpose()?,
+            ip_file,
+            ip_type: *ip_type,
+            last_ips: std::sync::Arc::new(tokio::sync::Mutex::new(
+                load_ip(ip_file)?.unwrap_or_default(),
+            )),
+        };
+
+        ensure!(
+            state.key_file.is_some() || *insecure,
+            "a key file must be used"
+        );
+
+        Ok(state)
+    }
+}
+
+fn load_ip(path: &Path) -> Result<Option<SavedIPs>> {
     debug!("loading last IP from {}", path.display());
     let data = match std::fs::read_to_string(path) {
         Ok(ip) => ip,
@@ -138,120 +219,117 @@ fn load_ip(path: &Path) -> Result<Option<IpAddr>> {
         }
     };
 
-    Ok(Some(
-        data.parse()
-            .into_diagnostic()
-            .wrap_err("failed to parse last ip address")?,
-    ))
+    SavedIPs::from_str(&data)
+        .wrap_err_with(|| format!("failed to load last ip address from {}", path.display()))
+        .map(Some)
 }
 
+#[derive(Clone, Copy, Debug)]
+struct Ipv6Prefix {
+    prefix: Ipv6Addr,
+    length: u32,
+}
+
+impl std::fmt::Display for Ipv6Prefix {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        let Self { prefix, length } = self;
+        write!(f, "{prefix}/{length}")
+    }
+}
+
+impl std::str::FromStr for Ipv6Prefix {
+    type Err = miette::Error;
+
+    fn from_str(s: &str) -> std::result::Result<Self, Self::Err> {
+        let (addr, len) = s.split_once('/').wrap_err("missing `/` in ipv6 prefix")?;
+        Ok(Self {
+            prefix: addr
+                .parse()
+                .into_diagnostic()
+                .wrap_err("invalid ipv6 address for ipv6 prefix")?,
+            length: len
+                .parse()
+                .into_diagnostic()
+                .wrap_err("invalid length for ipv6 prefix")?,
+        })
+    }
+}
+
+#[tracing::instrument(err)]
 fn main() -> Result<()> {
     // set panic hook to pretty print with miette's formatter
     miette::set_panic_hook();
 
     // parse cli arguments
     let mut args = Opts::parse();
-    debug!("{args:?}");
 
     // configure logger
     let subscriber = tracing_subscriber::FmtSubscriber::builder()
         .without_time()
         .with_env_filter(
             EnvFilter::builder()
-                .with_default_directive(
-                    if args.verbosity.is_present() {
-                        match args.verbosity.log_level_filter() {
-                            clap_verbosity_flag::LevelFilter::Off => LevelFilter::OFF,
-                            clap_verbosity_flag::LevelFilter::Error => LevelFilter::ERROR,
-                            clap_verbosity_flag::LevelFilter::Warn => LevelFilter::WARN,
-                            clap_verbosity_flag::LevelFilter::Info => LevelFilter::INFO,
-                            clap_verbosity_flag::LevelFilter::Debug => LevelFilter::DEBUG,
-                            clap_verbosity_flag::LevelFilter::Trace => LevelFilter::TRACE,
-                        }
-                    } else {
-                        LevelFilter::WARN
-                    }
-                    .into(),
-                )
+                .with_default_directive(args.verbosity.tracing_level_filter().into())
                 .from_env_lossy(),
         )
         .finish();
+
     tracing::subscriber::set_global_default(subscriber)
         .into_diagnostic()
-        .wrap_err("setting global tracing subscriber")?;
+        .wrap_err("failed to set global tracing subscriber")?;
 
-    // process subcommand
-    if let Some(cmd) = args.subcommand.take() {
-        return cmd.process(&args);
-    }
+    debug!("{args:?}");
+
+    let config = match args.config_or_command.take() {
+        // process subcommand
+        (None, Some(cmd)) => return cmd.process(&args),
+        (Some(path), None) => {
+            let config = config::Config::load(&path)?;
+            if let Err(err) = config.verify() {
+                error!("failed to verify configuration: {err}");
+            }
+            config
+        }
+        (None, None) | (Some(_), Some(_)) => unreachable!(
+            "bad state, one of config or subcommand should be available (clap should enforce this)"
+        ),
+    };
+
+    // Initialize state
+    let state = AppState::from_args(&args, &config)?;
 
     let Opts {
         verbosity: _,
-        address: ip,
-        port,
-        password_file,
-        data_dir,
-        key_file,
+        data_dir: _,
         insecure,
-        subcommand: _,
-        records,
-        salt,
-        ttl,
-        ip_source,
+        config_or_command: _,
     } = args;
 
     info!("checking environment");
 
-    // Set state
-    let ttl = Duration::from_secs(ttl);
+    // Load password hash
+    let password_hash = config
+        .password
+        .password_file
+        .map(|path| -> miette::Result<_> {
+            let path = path.as_path();
+            let pass = std::fs::read_to_string(path).into_diagnostic()?;
 
-    // Use last registered IP address if available
-    let ip_file = data_dir.join("last-ip");
+            let pass: Box<[u8]> = URL_SAFE_NO_PAD
+                .decode(pass.trim().as_bytes())
+                .into_diagnostic()
+                .wrap_err_with(|| format!("failed to decode password from {}", path.display()))?
+                .into();
 
-    let state = AppState {
-        ttl,
-        salt: salt.leak(),
-        // Load DNS records
-        records: records::load_no_verify(&records)?,
-        // Load keyfile
-        key_file: key_file
-            .map(|key_file| -> miette::Result<_> {
-                let path = key_file.as_path();
-                std::fs::File::open(path)
-                    .into_diagnostic()
-                    .wrap_err_with(|| {
-                        format!("{} is not readable by the current user", path.display())
-                    })?;
-                Ok(&*Box::leak(key_file.into_boxed_path()))
-            })
-            .transpose()?,
-        // Load password hash
-        password_hash: password_file
-            .map(|path| -> miette::Result<_> {
-                let pass = std::fs::read_to_string(path.as_path()).into_diagnostic()?;
-
-                let pass: Box<[u8]> = URL_SAFE_NO_PAD
-                    .decode(pass.trim().as_bytes())
-                    .into_diagnostic()
-                    .wrap_err_with(|| format!("failed to decode password from {}", path.display()))?
-                    .into();
-
-                Ok(&*Box::leak(pass))
-            })
-            .transpose()?,
-        ip_file: Box::leak(ip_file.into_boxed_path()),
-    };
+            Ok(pass)
+        })
+        .transpose()
+        .wrap_err("failed to load password hash")?;
 
     ensure!(
-        state.password_hash.is_some() || insecure,
+        password_hash.is_some() || insecure,
         "a password must be used"
     );
 
-    ensure!(
-        state.key_file.is_some() || insecure,
-        "a key file must be used"
-    );
-
     let rt = tokio::runtime::Builder::new_current_thread()
         .enable_all()
         .build()
@@ -259,9 +337,17 @@ fn main() -> Result<()> {
         .wrap_err("failed to start the tokio runtime")?;
 
     rt.block_on(async {
-        // Load previous IP and update DNS record to point to it (if available)
-        match load_ip(state.ip_file) {
-            Ok(Some(ip)) => match nsupdate(ip, ttl, state.key_file, state.records).await {
+        // Update DNS record with previous IPs (if available)
+        let ips = state.last_ips.lock().await.clone();
+
+        let mut actions = ips
+            .ips()
+            .filter(|ip| config.records.ip_type.valid_for_type(*ip))
+            .flat_map(|ip| nsupdate::Action::from_records(ip, state.ttl, state.records))
+            .peekable();
+
+        if actions.peek().is_some() {
+            match nsupdate::nsupdate(state.key_file, actions).await {
                 Ok(status) => {
                     if !status.success() {
                         error!("nsupdate failed: code {status}");
@@ -274,25 +360,31 @@ fn main() -> Result<()> {
                         .into_diagnostic()
                         .wrap_err("failed to update records with previous IP");
                 }
-            },
-            Ok(None) => {
-                info!("No previous IP address set");
             }
-            Err(err) => {
-                error!("Failed to load last ip address: {err}")
-            }
-        };
+        }
+
+        // Create services
+        let app = Router::new().route("/update", get(update_records));
+        // if a password is provided, validate it
+        let app = if let Some(pass) = password_hash {
+            app.layer(auth::layer(
+                Box::leak(pass),
+                Box::leak(config.password.salt),
+            ))
+        } else {
+            app
+        }
+        .layer(config.records.ip_source.into_extension())
+        .with_state(state);
+
+        let config::Server { address } = config.server;
 
         // Start services
-        let app = Router::new()
-            .route("/update", get(update_records))
-            .layer(ip_source.into_extension())
-            .with_state(state);
-        info!("starting listener on {ip}:{port}");
-        let listener = tokio::net::TcpListener::bind(SocketAddr::new(ip, port))
+        info!("starting listener on {address}");
+        let listener = tokio::net::TcpListener::bind(address)
             .await
             .into_diagnostic()?;
-        info!("listening on {ip}:{port}");
+        info!("listening on {address}");
         axum::serve(
             listener,
             app.into_make_service_with_connect_info::<SocketAddr>(),
@@ -300,157 +392,318 @@ fn main() -> Result<()> {
         .await
         .into_diagnostic()
     })
+    .wrap_err("failed to run main loop")
 }
 
-#[tracing::instrument(skip(state, pass), level = "trace", ret(level = "info"))]
+/// Serde deserialization decorator to map empty Strings to None,
+///
+/// Adapted from: <https://github.com/tokio-rs/axum/blob/main/examples/query-params-with-empty-strings/src/main.rs>
+fn empty_string_as_none<'de, D, T>(de: D) -> Result<Option<T>, D::Error>
+where
+    D: serde::Deserializer<'de>,
+    T: std::str::FromStr,
+    T::Err: std::fmt::Display,
+{
+    use serde::Deserialize;
+
+    let opt = Option::<std::borrow::Cow<'de, str>>::deserialize(de)?;
+    match opt.as_deref() {
+        None | Some("") => Ok(None),
+        Some(s) => s.parse::<T>().map_err(serde::de::Error::custom).map(Some),
+    }
+}
+
+#[derive(Debug, serde::Deserialize)]
+#[serde(deny_unknown_fields)]
+struct FritzBoxUpdateParams {
+    /// The domain that should be updated
+    #[allow(unused)]
+    #[serde(default, deserialize_with = "empty_string_as_none")]
+    domain: Option<String>,
+    /// IPv4 address for the domain
+    #[serde(default, deserialize_with = "empty_string_as_none")]
+    ipv4: Option<Ipv4Addr>,
+    /// IPv6 address for the domain
+    #[serde(default, deserialize_with = "empty_string_as_none")]
+    ipv6: Option<Ipv6Addr>,
+    /// IPv6 prefix for the home network
+    #[allow(unused)]
+    #[serde(default, deserialize_with = "empty_string_as_none")]
+    ipv6prefix: Option<Ipv6Prefix>,
+    /// Whether the networks uses both IPv4 and IPv6
+    #[allow(unused)]
+    #[serde(default, deserialize_with = "empty_string_as_none")]
+    dualstack: Option<String>,
+}
+
+impl FritzBoxUpdateParams {
+    fn has_data(&self) -> bool {
+        let Self {
+            domain,
+            ipv4,
+            ipv6,
+            ipv6prefix,
+            dualstack,
+        } = self;
+        domain.is_some()
+            | ipv4.is_some()
+            | ipv6.is_some()
+            | ipv6prefix.is_some()
+            | dualstack.is_some()
+    }
+}
+
+#[tracing::instrument(skip(state), level = "trace", ret(level = "info"))]
 async fn update_records(
     State(state): State<AppState<'static>>,
-    AuthBasic((username, pass)): AuthBasic,
-    SecureClientIp(ip): SecureClientIp,
+    ClientIp(ip): ClientIp,
+    Query(update_params): Query<FritzBoxUpdateParams>,
 ) -> axum::response::Result<&'static str> {
-    debug!("received update request from {ip}");
-    let Some(pass) = pass else {
-        return Err((StatusCode::UNAUTHORIZED, Json::from("no password provided")).into());
-    };
+    info!("accepted update from {ip}");
 
-    if let Some(stored_pass) = state.password_hash {
-        let password = pass.trim().to_string();
-        let pass_hash = password::hash_identity(&username, &password, state.salt);
-        if pass_hash.as_ref() != stored_pass {
-            warn!("rejected update");
-            trace!(
-                "mismatched hashes:\n{}\n{}",
-                URL_SAFE_NO_PAD.encode(pass_hash.as_ref()),
-                URL_SAFE_NO_PAD.encode(stored_pass),
+    if !update_params.has_data() {
+        if !state.ip_type.valid_for_type(ip) {
+            tracing::warn!(
+                "rejecting update from {ip} as we are running a {} filter",
+                state.ip_type
             );
-            return Err((StatusCode::UNAUTHORIZED, "invalid identity").into());
+            return Err((
+                StatusCode::CONFLICT,
+                format!("running in {} mode", state.ip_type),
+            )
+                .into());
+        }
+
+        return trigger_update(ip, &state).await;
+    }
+
+    // FIXME: mark suspicious updates (where IP doesn't match the update_ip) and reject them based
+    // on policy
+
+    let FritzBoxUpdateParams {
+        domain: _,
+        ipv4,
+        ipv6,
+        ipv6prefix: _,
+        dualstack: _,
+    } = update_params;
+
+    if ipv4.is_none() && ipv6.is_none() {
+        return Err((
+            StatusCode::BAD_REQUEST,
+            "failed to provide an IP for the update",
+        )
+            .into());
+    }
+
+    if let Some(ip) = ipv4 {
+        let ip = IpAddr::V4(ip);
+        if state.ip_type.valid_for_type(ip) {
+            _ = trigger_update(ip, &state).await?;
+        } else {
+            tracing::warn!("requested update of IPv4 but we are {}", state.ip_type);
         }
     }
 
-    info!("accepted update");
-    match nsupdate(ip, state.ttl, state.key_file, state.records).await {
+    if let Some(ip) = ipv6 {
+        let ip = IpAddr::V6(ip);
+        if state.ip_type.valid_for_type(ip) {
+            _ = trigger_update(ip, &state).await?;
+        } else {
+            tracing::warn!("requested update of IPv6 but we are {}", state.ip_type);
+        }
+    }
+
+    Ok("Successfully updated IP of records!\n")
+}
+
+#[tracing::instrument(skip(state), level = "trace", ret(level = "info"))]
+async fn trigger_update(
+    ip: IpAddr,
+    state: &AppState<'static>,
+) -> axum::response::Result<&'static str> {
+    let actions = nsupdate::Action::from_records(ip, state.ttl, state.records);
+
+    if actions.len() == 0 {
+        return Err((
+            StatusCode::INTERNAL_SERVER_ERROR,
+            "Nothing to do (e.g. we are ipv4-only but an ipv6 update was requested)",
+        )
+            .into());
+    }
+
+    match nsupdate::nsupdate(state.key_file, actions).await {
         Ok(status) if status.success() => {
+            let ips = {
+                // Update state
+                let mut ips = state.last_ips.lock().await;
+                ips.update(ip);
+                ips.clone()
+            };
+
+            let ip_file = state.ip_file;
             tokio::task::spawn_blocking(move || {
-                info!("updating last ip to {ip}");
-                if let Err(err) = std::fs::write(state.ip_file, format!("{ip}")) {
+                info!("updating last ips to {ips:?}");
+                let data = serde_json::to_vec(&ips).expect("invalid serialization impl");
+                if let Err(err) = std::fs::write(ip_file, data) {
                     error!("Failed to update last IP: {err}");
                 }
-                info!("updated last ip to {ip}");
+                info!("updated last ips to {ips:?}");
             });
-            Ok("successful update")
+
+            Ok("Successfully updated IP of records!\n")
         }
         Ok(status) => {
             error!("nsupdate failed with code {status}");
             Err((
                 StatusCode::INTERNAL_SERVER_ERROR,
-                "nsupdate failed, check server logs",
+                "nsupdate failed, check server logs\n",
             )
                 .into())
         }
         Err(error) => Err((
             StatusCode::INTERNAL_SERVER_ERROR,
-            format!("failed to update records: {error}"),
+            format!("failed to update records: {error}\n"),
         )
             .into()),
     }
 }
 
-#[tracing::instrument(level = "trace", ret(level = "warn"))]
-async fn nsupdate(
-    ip: IpAddr,
-    ttl: Duration,
-    key_file: Option<&Path>,
-    records: &[&str],
-) -> std::io::Result<ExitStatus> {
-    let mut cmd = tokio::process::Command::new("nsupdate");
-    if let Some(key_file) = key_file {
-        cmd.args([OsStr::new("-k"), key_file.as_os_str()]);
-    }
-    debug!("spawning new process");
-    let mut child = cmd
-        .stdin(Stdio::piped())
-        .spawn()
-        .inspect_err(|err| warn!("failed to spawn child: {err}"))?;
-    let mut stdin = child.stdin.take().expect("stdin not present");
-    debug!("sending update request");
-    stdin
-        .write_all(update_ns_records(ip, ttl, records).as_bytes())
-        .await
-        .inspect_err(|err| warn!("failed to write to the stdin of nsupdate: {err}"))?;
-    debug!("closing stdin");
-    stdin
-        .shutdown()
-        .await
-        .inspect_err(|err| warn!("failed to close stdin to nsupdate: {err}"))?;
-    debug!("waiting for nsupdate to exit");
-    child
-        .wait()
-        .await
-        .inspect_err(|err| warn!("failed to wait for child: {err}"))
-}
-
-fn update_ns_records(ip: IpAddr, ttl: Duration, records: &[&str]) -> String {
-    use std::fmt::Write;
-    let ttl_s: u64 = ttl.as_secs();
-
-    let rec_type = match ip {
-        IpAddr::V4(_) => "A",
-        IpAddr::V6(_) => "AAAA",
-    };
-    let mut cmds = String::from("server 127.0.0.1\n");
-    for &record in records {
-        writeln!(cmds, "update delete {record} {ttl_s} IN {rec_type}").unwrap();
-        writeln!(cmds, "update add    {record} {ttl_s} IN {rec_type} {ip}").unwrap();
-    }
-    writeln!(cmds, "send\nquit").unwrap();
-    cmds
-}
-
 #[cfg(test)]
-mod test {
-    use insta::assert_snapshot;
+mod parse_query_params {
+    use axum::extract::Query;
 
-    use crate::{update_ns_records, DEFAULT_TTL};
-
-    use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
+    use super::FritzBoxUpdateParams;
 
     #[test]
-    #[allow(non_snake_case)]
-    fn expected_update_string_A() {
-        assert_snapshot!(update_ns_records(
-            IpAddr::V4(Ipv4Addr::LOCALHOST),
-            DEFAULT_TTL,
-            &["example.com.", "example.org.", "example.net."],
-        ), @r###"
-        server 127.0.0.1
-        update delete example.com. 60 IN A
-        update add    example.com. 60 IN A 127.0.0.1
-        update delete example.org. 60 IN A
-        update add    example.org. 60 IN A 127.0.0.1
-        update delete example.net. 60 IN A
-        update add    example.net. 60 IN A 127.0.0.1
-        send
-        quit
-        "###);
+    fn no_params() {
+        let uri = http::Uri::builder()
+            .path_and_query("/update")
+            .build()
+            .unwrap();
+        let query: Query<FritzBoxUpdateParams> = Query::try_from_uri(&uri).unwrap();
+        insta::assert_debug_snapshot!(query, @r#"
+    Query(
+        FritzBoxUpdateParams {
+            domain: None,
+            ipv4: None,
+            ipv6: None,
+            ipv6prefix: None,
+            dualstack: None,
+        },
+    )
+    "#);
     }
 
     #[test]
-    #[allow(non_snake_case)]
-    fn expected_update_string_AAAA() {
-        assert_snapshot!(update_ns_records(
-            IpAddr::V6(Ipv6Addr::LOCALHOST),
-            DEFAULT_TTL,
-            &["example.com.", "example.org.", "example.net."],
-        ), @r###"
-        server 127.0.0.1
-        update delete example.com. 60 IN AAAA
-        update add    example.com. 60 IN AAAA ::1
-        update delete example.org. 60 IN AAAA
-        update add    example.org. 60 IN AAAA ::1
-        update delete example.net. 60 IN AAAA
-        update add    example.net. 60 IN AAAA ::1
-        send
-        quit
-        "###);
+    fn ipv4() {
+        let uri = http::Uri::builder()
+            .path_and_query("/update?ipv4=1.2.3.4")
+            .build()
+            .unwrap();
+        let query: Query<FritzBoxUpdateParams> = Query::try_from_uri(&uri).unwrap();
+        insta::assert_debug_snapshot!(query, @r#"
+    Query(
+        FritzBoxUpdateParams {
+            domain: None,
+            ipv4: Some(
+                1.2.3.4,
+            ),
+            ipv6: None,
+            ipv6prefix: None,
+            dualstack: None,
+        },
+    )
+    "#);
+    }
+
+    #[test]
+    fn ipv6() {
+        let uri = http::Uri::builder()
+            .path_and_query("/update?ipv6=%3A%3A1234")
+            .build()
+            .unwrap();
+        let query: Query<FritzBoxUpdateParams> = Query::try_from_uri(&uri).unwrap();
+        insta::assert_debug_snapshot!(query, @r#"
+    Query(
+        FritzBoxUpdateParams {
+            domain: None,
+            ipv4: None,
+            ipv6: Some(
+                ::1234,
+            ),
+            ipv6prefix: None,
+            dualstack: None,
+        },
+    )
+    "#);
+    }
+
+    #[test]
+    fn ipv4_and_ipv6() {
+        let uri = http::Uri::builder()
+            .path_and_query("/update?ipv4=1.2.3.4&ipv6=%3A%3A1234")
+            .build()
+            .unwrap();
+        let query: Query<FritzBoxUpdateParams> = Query::try_from_uri(&uri).unwrap();
+        insta::assert_debug_snapshot!(query, @r#"
+    Query(
+        FritzBoxUpdateParams {
+            domain: None,
+            ipv4: Some(
+                1.2.3.4,
+            ),
+            ipv6: Some(
+                ::1234,
+            ),
+            ipv6prefix: None,
+            dualstack: None,
+        },
+    )
+    "#);
+    }
+
+    #[test]
+    fn ipv4_and_empty_ipv6() {
+        let uri = http::Uri::builder()
+            .path_and_query("/update?ipv4=1.2.3.4&ipv6=")
+            .build()
+            .unwrap();
+        let query: Query<FritzBoxUpdateParams> = Query::try_from_uri(&uri).unwrap();
+        insta::assert_debug_snapshot!(query, @r#"
+    Query(
+        FritzBoxUpdateParams {
+            domain: None,
+            ipv4: Some(
+                1.2.3.4,
+            ),
+            ipv6: None,
+            ipv6prefix: None,
+            dualstack: None,
+        },
+    )
+    "#);
+    }
+
+    #[test]
+    fn empty_ipv4_and_ipv6() {
+        let uri = http::Uri::builder()
+            .path_and_query("/update?ipv4=&ipv6=%3A%3A1234")
+            .build()
+            .unwrap();
+        let query: Query<FritzBoxUpdateParams> = Query::try_from_uri(&uri).unwrap();
+        insta::assert_debug_snapshot!(query, @r#"
+    Query(
+        FritzBoxUpdateParams {
+            domain: None,
+            ipv4: None,
+            ipv6: Some(
+                ::1234,
+            ),
+            ipv6prefix: None,
+            dualstack: None,
+        },
+    )
+    "#);
     }
 }

src/nsupdate.rs

@@ -0,0 +1,156 @@
+use std::{
+    ffi::OsStr,
+    net::IpAddr,
+    path::Path,
+    process::{ExitStatus, Stdio},
+    time::Duration,
+};
+
+use tokio::io::AsyncWriteExt;
+use tracing::{debug, warn};
+
+pub enum Action<'a> {
+    // Reassign a domain to a different IP
+    Reassign {
+        domain: &'a str,
+        to: IpAddr,
+        ttl: Duration,
+    },
+}
+
+impl<'a> Action<'a> {
+    /// Create a set of [`Action`]s reassigning the domains in `records` to the specified
+    /// [`IpAddr`]
+    pub fn from_records(
+        to: IpAddr,
+        ttl: Duration,
+        records: &'a [&'a str],
+    ) -> impl IntoIterator<Item = Self> + std::iter::ExactSizeIterator + 'a {
+        records
+            .iter()
+            .map(move |&domain| Action::Reassign { domain, to, ttl })
+    }
+}
+
+impl std::fmt::Display for Action<'_> {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            Action::Reassign { domain, to, ttl } => {
+                let ttl = ttl.as_secs();
+                let kind = match to {
+                    IpAddr::V4(_) => "A",
+                    IpAddr::V6(_) => "AAAA",
+                };
+                // Delete previous record of type `kind`
+                writeln!(f, "update delete {domain} {ttl} IN {kind}")?;
+                // Add record with new IP
+                writeln!(f, "update add    {domain} {ttl} IN {kind} {to}")
+            }
+        }
+    }
+}
+
+#[tracing::instrument(level = "trace", skip(actions), ret(level = "warn"))]
+pub async fn nsupdate(
+    key_file: Option<&Path>,
+    actions: impl IntoIterator<Item = Action<'_>>,
+) -> std::io::Result<ExitStatus> {
+    let mut cmd = tokio::process::Command::new("nsupdate");
+    if let Some(key_file) = key_file {
+        cmd.args([OsStr::new("-k"), key_file.as_os_str()]);
+    }
+    debug!("spawning new process");
+    let mut child = cmd
+        .stdin(Stdio::piped())
+        .spawn()
+        .inspect_err(|err| warn!("failed to spawn child: {err}"))?;
+    let mut stdin = child.stdin.take().expect("stdin not present");
+    debug!("sending update request");
+    let mut buf = Vec::new();
+    update_ns_records(&mut buf, actions).unwrap();
+    stdin
+        .write_all(&buf)
+        .await
+        .inspect_err(|err| warn!("failed to write to the stdin of nsupdate: {err}"))?;
+
+    debug!("closing stdin");
+    stdin
+        .shutdown()
+        .await
+        .inspect_err(|err| warn!("failed to close stdin to nsupdate: {err}"))?;
+    debug!("waiting for nsupdate to exit");
+    child
+        .wait()
+        .await
+        .inspect_err(|err| warn!("failed to wait for child: {err}"))
+}
+
+fn update_ns_records<'a>(
+    mut buf: impl std::io::Write,
+    actions: impl IntoIterator<Item = Action<'a>>,
+) -> std::io::Result<()> {
+    writeln!(buf, "server 127.0.0.1")?;
+    for action in actions {
+        write!(buf, "{action}")?;
+    }
+    writeln!(buf, "send")?;
+    writeln!(buf, "quit")
+}
+
+#[cfg(test)]
+mod test {
+    use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
+
+    use insta::assert_snapshot;
+
+    use super::{update_ns_records, Action};
+    use crate::DEFAULT_TTL;
+
+    #[test]
+    #[allow(non_snake_case)]
+    fn expected_update_string_A() {
+        let mut buf = Vec::new();
+        let actions = Action::from_records(
+            IpAddr::V4(Ipv4Addr::LOCALHOST),
+            DEFAULT_TTL,
+            &["example.com.", "example.org.", "example.net."],
+        );
+        update_ns_records(&mut buf, actions).unwrap();
+
+        assert_snapshot!(String::from_utf8(buf).unwrap(), @r###"
+        server 127.0.0.1
+        update delete example.com. 60 IN A
+        update add    example.com. 60 IN A 127.0.0.1
+        update delete example.org. 60 IN A
+        update add    example.org. 60 IN A 127.0.0.1
+        update delete example.net. 60 IN A
+        update add    example.net. 60 IN A 127.0.0.1
+        send
+        quit
+        "###);
+    }
+
+    #[test]
+    #[allow(non_snake_case)]
+    fn expected_update_string_AAAA() {
+        let mut buf = Vec::new();
+        let actions = Action::from_records(
+            IpAddr::V6(Ipv6Addr::LOCALHOST),
+            DEFAULT_TTL,
+            &["example.com.", "example.org.", "example.net."],
+        );
+        update_ns_records(&mut buf, actions).unwrap();
+
+        assert_snapshot!(String::from_utf8(buf).unwrap(), @r###"
+        server 127.0.0.1
+        update delete example.com. 60 IN AAAA
+        update add    example.com. 60 IN AAAA ::1
+        update delete example.org. 60 IN AAAA
+        update add    example.org. 60 IN AAAA ::1
+        update delete example.net. 60 IN AAAA
+        update add    example.net. 60 IN AAAA ::1
+        send
+        quit
+        "###);
+    }
+}

src/password.rs

@@ -4,7 +4,7 @@
 //! records
 use std::io::Write;
 use std::os::unix::fs::OpenOptionsExt;
-use std::path::Path;
+use std::path::PathBuf;
 
 use base64::prelude::*;
 use miette::{Context, IntoDiagnostic, Result};
@@ -20,28 +20,48 @@ pub struct Mkpasswd {
 
     /// The password
     password: String,
+
+    /// An application specific value
+    #[arg(long, default_value = crate::DEFAULT_SALT)]
+    salt: String,
+
+    /// The file to write the password to
+    password_file: Option<PathBuf>,
 }
 
 impl Mkpasswd {
-    pub fn process(self, args: &crate::Opts) -> Result<()> {
-        mkpasswd(self, args.password_file.as_deref(), &args.salt)
+    pub fn process(self, _args: &crate::Opts) -> Result<()> {
+        mkpasswd(self)
     }
 }
 
+pub fn hash_basic_auth(user_pass: &[u8], salt: &str) -> Digest {
+    let mut context = ring::digest::Context::new(&ring::digest::SHA256);
+    context.update(user_pass);
+    context.update(salt.as_bytes());
+    context.finish()
+}
+
 pub fn hash_identity(username: &str, password: &str, salt: &str) -> Digest {
-    let mut data = Vec::with_capacity(username.len() + password.len() + salt.len() + 1);
-    write!(data, "{username}:{password}{salt}").unwrap();
-    ring::digest::digest(&ring::digest::SHA256, &data)
+    let mut context = ring::digest::Context::new(&ring::digest::SHA256);
+    context.update(username.as_bytes());
+    context.update(b":");
+    context.update(password.as_bytes());
+    context.update(salt.as_bytes());
+    context.finish()
 }
 
 pub fn mkpasswd(
-    Mkpasswd { username, password }: Mkpasswd,
-    password_file: Option<&Path>,
-    salt: &str,
+    Mkpasswd {
+        username,
+        password,
+        salt,
+        password_file,
+    }: Mkpasswd,
 ) -> miette::Result<()> {
-    let hash = hash_identity(&username, &password, salt);
+    let hash = hash_identity(&username, &password, &salt);
     let encoded = BASE64_URL_SAFE_NO_PAD.encode(hash.as_ref());
-    let Some(path) = password_file else {
+    let Some(path) = password_file.as_deref() else {
         println!("{encoded}");
         return Ok(());
     };

src/records.rs

@@ -1,52 +1,9 @@
 //! Deal with the DNS records
 
-use std::path::Path;
+use miette::{ensure, miette, LabeledSpan, Result};
 
-use miette::{ensure, miette, Context, IntoDiagnostic, LabeledSpan, NamedSource, Result};
-
-/// Loads and verifies the records from a file
-pub fn load(path: &Path) -> Result<()> {
-    let records = std::fs::read_to_string(path)
-        .into_diagnostic()
-        .wrap_err_with(|| format!("failed to read records from {}", path.display()))?;
-
-    verify(&records, path)?;
-
-    Ok(())
-}
-
-/// Load records without verifying them
-pub fn load_no_verify(path: &Path) -> Result<&'static [&'static str]> {
-    let records = std::fs::read_to_string(path)
-        .into_diagnostic()
-        .wrap_err_with(|| format!("failed to read records from {}", path.display()))?;
-
-    if let Err(err) = verify(&records, path) {
-        tracing::error!("Failed to verify records: {err}");
-    }
-
-    // leak memory: we only do this here and it prevents a bunch of allocations
-    let records: &str = records.leak();
-    let records: Box<[&str]> = records.lines().collect();
-
-    Ok(Box::leak(records))
-}
-
-/// Verifies that a list of records is valid
-pub fn verify(data: &str, path: &Path) -> Result<()> {
-    let mut offset = 0usize;
-    for line in data.lines() {
-        validate_line(offset, line).map_err(|err| {
-            err.with_source_code(NamedSource::new(
-                path.display().to_string(),
-                data.to_string(),
-            ))
-        })?;
-
-        offset += line.len() + 1;
-    }
-
-    Ok(())
+pub fn validate_record_str(record: &str) -> Result<()> {
+    validate_line(0, record).map_err(|err| err.with_source_code(String::from(record)))
 }
 
 fn validate_line(offset: usize, line: &str) -> Result<()> {
@@ -156,7 +113,7 @@ fn validate_octet(offset: usize, octet: u8) -> Result<()> {
 
 #[cfg(test)]
 mod test {
-    use crate::records::verify;
+    use crate::records::validate_record_str;
 
     macro_rules! assert_miette_snapshot {
         ($diag:expr) => {{
@@ -180,104 +137,51 @@ mod test {
 
     #[test]
     fn valid_records() -> miette::Result<()> {
-        verify(
-            "\
-            example.com.\n\
-            example.org.\n\
-            example.net.\n\
-            subdomain.example.com.\n\
-            ",
-            std::path::Path::new("test_records_valid"),
-        )
+        for record in [
+            "example.com.",
+            "example.org.",
+            "example.net.",
+            "subdomain.example.com.",
+        ] {
+            validate_record_str(record)?;
+        }
+        Ok(())
     }
 
     #[test]
     fn hostname_too_long() {
-        let err = verify(
-            "\
-            example.com.\n\
-            example.org.\n\
-            example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.net.\n\
-            subdomain.example.com.\n\
-            ",
-            std::path::Path::new("test_records_invalid"),
-        )
-        .unwrap_err();
+        let err = validate_record_str("example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.net.").unwrap_err();
         assert_miette_snapshot!(err);
     }
 
     #[test]
     fn not_fqd() {
-        let err = verify(
-            "\
-            example.com.\n\
-            example.org.\n\
-            example.net\n\
-            subdomain.example.com.\n\
-            ",
-            std::path::Path::new("test_records_invalid"),
-        )
-        .unwrap_err();
+        let err = validate_record_str("example.net").unwrap_err();
         assert_miette_snapshot!(err);
     }
 
     #[test]
     fn empty_label() {
-        let err = verify(
-            "\
-            example.com.\n\
-            name..example.org.\n\
-            example.net.\n\
-            subdomain.example.com.\n\
-            ",
-            std::path::Path::new("test_records_invalid"),
-        )
-        .unwrap_err();
+        let err = validate_record_str("name..example.org.").unwrap_err();
         assert_miette_snapshot!(err);
     }
 
     #[test]
     fn label_too_long() {
-        let err = verify(
-            "\
-            example.com.\n\
-            name.an-entremely-long-label-that-should-not-exist-because-it-goes-against-the-spec.example.org.\n\
-            example.net.\n\
-            subdomain.example.com.\n\
-            ",
-            std::path::Path::new("test_records_invalid"),
-        )
-        .unwrap_err();
+        let err = validate_record_str("name.an-entremely-long-label-that-should-not-exist-because-it-goes-against-the-spec.example.org.").unwrap_err();
         assert_miette_snapshot!(err);
     }
 
     #[test]
     fn invalid_ascii() {
-        let err = verify(
-            "\
-            example.com.\n\
-            name.this-is-not-aßcii.example.org.\n\
-            example.net.\n\
-            subdomain.example.com.\n\
-            ",
-            std::path::Path::new("test_records_invalid"),
-        )
-        .unwrap_err();
+        let err = validate_record_str("name.this-is-not-ascii-ß.example.org.").unwrap_err();
         assert_miette_snapshot!(err);
     }
 
     #[test]
     fn invalid_octet() {
-        let err = verify(
-            "\
-            example.com.\n\
-            name.this-character:-is-not-allowed.example.org.\n\
-            example.net.\n\
-            subdomain.example.com.\n\
-            ",
-            std::path::Path::new("test_records_invalid"),
-        )
-        .unwrap_err();
+        let err =
+            validate_record_str("name.this-character:-is-not-allowed.example.org.").unwrap_err();
         assert_miette_snapshot!(err);
     }
 }

src/snapshots/webnsupdate__records__test__empty_label.snap

@@ -6,11 +6,9 @@ expression: out
 ]8;;https://en.wikipedia.org/wiki/Fully_qualified_domain_name\(link)]8;;\
 
   × empty label
-   ╭─[test_records_invalid:2:6]
- 1 │ example.com.
- 2 │ name..example.org.
+   ╭────
+ 1 │ name..example.org.
    ·      ▲
    ·      ╰── label
- 3 │ example.net.
    ╰────
   help: each label should have at least one character

src/snapshots/webnsupdate__records__test__hostname_too_long.snap

@@ -6,11 +6,9 @@ expression: out
 ]8;;https://en.wikipedia.org/wiki/Fully_qualified_domain_name\(link)]8;;\
 
   × hostname too long (260 octets)
-   ╭─[test_records_invalid:3:1]
- 2 │ example.org.
- 3 │ example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.net.
+   ╭────
+ 1 │ example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.example.net.
    · ──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┬─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
    ·                                                                                                                                   ╰── this line
- 4 │ subdomain.example.com.
    ╰────
   help: fully qualified domain names can be at most 255 characters long

src/snapshots/webnsupdate__records__test__invalid_ascii.snap

@@ -6,11 +6,9 @@ expression: out
 ]8;;https://en.wikipedia.org/wiki/Hostname#Syntax\(link)]8;;\
 
   × invalid octet: '\xc3'
-   ╭─[test_records_invalid:2:19]
- 1 │ example.com.
- 2 │ name.this-is-not-aßcii.example.org.
-   ·                   ┬
-   ·                   ╰── octet
- 3 │ example.net.
+   ╭────
+ 1 │ name.this-is-not-ascii-ß.example.org.
+   ·                        ┬
+   ·                        ╰── octet
    ╰────
   help: we only accept ascii characters

src/snapshots/webnsupdate__records__test__invalid_octet.snap

@@ -6,11 +6,9 @@ expression: out
 ]8;;https://en.wikipedia.org/wiki/Hostname#Syntax\(link)]8;;\
 
   × invalid octet: ':'
-   ╭─[test_records_invalid:2:20]
- 1 │ example.com.
- 2 │ name.this-character:-is-not-allowed.example.org.
+   ╭────
+ 1 │ name.this-character:-is-not-allowed.example.org.
    ·                    ┬
    ·                    ╰── octet
- 3 │ example.net.
    ╰────
   help: hostnames are only allowed to contain characters in [a-zA-Z0-9_-]

src/snapshots/webnsupdate__records__test__label_too_long.snap

@@ -6,11 +6,9 @@ expression: out
 ]8;;https://en.wikipedia.org/wiki/Fully_qualified_domain_name\(link)]8;;\
 
   × label too long (78 octets)
-   ╭─[test_records_invalid:2:6]
- 1 │ example.com.
- 2 │ name.an-entremely-long-label-that-should-not-exist-because-it-goes-against-the-spec.example.org.
+   ╭────
+ 1 │ name.an-entremely-long-label-that-should-not-exist-because-it-goes-against-the-spec.example.org.
    ·      ───────────────────────────────────────┬──────────────────────────────────────
    ·                                             ╰── label
- 3 │ example.net.
    ╰────
   help: labels should be at most 63 octets

src/snapshots/webnsupdate__records__test__not_fqd.snap

@@ -6,11 +6,9 @@ expression: out
 ]8;;https://en.wikipedia.org/wiki/Fully_qualified_domain_name\(link)]8;;\
 
   × not a fully qualified domain name
-   ╭─[test_records_invalid:3:11]
- 2 │ example.org.
- 3 │ example.net
+   ╭────
+ 1 │ example.net
    ·           ┬
    ·           ╰── last character
- 4 │ subdomain.example.com.
    ╰────
   help: hostname should be a fully qualified domain name (end with a '.')