docker: update alpine Docker tag to v3.23.0

Updates the requirements on [rubocop-rspec](https://github.com/rubocop/rubocop-rspec) to permit the latest version.
- [Release notes](https://github.com/rubocop/rubocop-rspec/releases)
- [Changelog](https://github.com/rubocop/rubocop-rspec/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rubocop/rubocop-rspec/compare/v3.7.0...v3.8.0)

---
updated-dependencies:
- dependency-name: rubocop-rspec
  dependency-version: 3.8.0
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/cd.yml

@@ -11,7 +11,7 @@ jobs:
   release-dockerimage:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: Extract dyndnsd version from tag name
       run: |

.github/workflows/ci.yml

@@ -23,7 +23,7 @@ jobs:
         - '3.3'
         - '3.4'
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: Set up Ruby ${{ matrix.ruby-version }}
       uses: ruby/setup-ruby@v1
       with:
@@ -37,7 +37,7 @@ jobs:
   actionlint:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: Check workflow files
       run: |
         echo "::add-matcher::.github/actionlint-matcher.json"
@@ -50,6 +50,6 @@ jobs:
       image: ghcr.io/renovatebot/renovate
       options: --user root
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: Check Renovate config
       run: renovate-config-validator --strict

.github/workflows/vulnscan.yml

@@ -1,10 +1,9 @@
-# yaml-language-server: $schema=https://json.schemastore.org/github-workflow.json
 ---
 name: vulnscan
 
 on:
   schedule:
-  - cron: '7 4 * * 4'  # weekly on thursday morning
+  - cron: '7 4 1 * *'  # monthly on first day's morning
   workflow_dispatch:
 
 jobs:

CHANGELOG.md

@@ -1,5 +1,11 @@
 # Changelog
 
+## 3.12.0 (December 4th, 2025)
+
+IMPROVEMENTS:
+
+- regex instead of hosts list can be used for hostname ownership
+
 ## 3.11.0 (October 2nd, 2025)
 
 IMPROVEMENTS:

README.md

@@ -307,6 +307,37 @@ users:
 ```
 
 
+### Matching with a regular expression
+
+Instead of relying on `hosts`, you can use `regex` to employ a regular expression, which is very useful for avoiding having to repeatedly edit the configuration file to register a new host name.
+
+```yaml
+host: "0.0.0.0"
+port: 5354
+username: "dyndnsd"
+group: "dyndnsd"
+db: "/dyndnsd/db.json"
+debug: false
+domain: "dyn.dc-air.home.arpa"
+updater:
+  name: "command_with_bind_zone"
+  params:
+    zone_file: "/nsd/zones/static/dyn.dc-air.home.arpa.zone"
+    command: "doas service nsd reload"
+    ttl: "5m"
+    dns: "ns.dc-air.home.arpa."
+    email_addr: "admin.example.org"
+users:
+  myuser:
+    password: "superhypermegas3kurepassword1234"
+    regex: '^[a-z][0-9]\.dyn\.dc\-air\.home\.arpa$'
+```
+
+However, when using `regex`, `hosts` is simply ignored if defined, so you must choose one or the other. Recommendation: use `regex` for scripts or programs and `hosts` for regular users.
+
+**Note**: Please note that when dyndnsd evaluates the regular expression, the `Regexp::EXTENDED` and `Regexp::IGNORECASE` options are used.
+
+
 ## License
 
 dyndnsd.rb is licensed under the Apache License, Version 2.0. See LICENSE for more information.

docker/Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.22.1
+FROM alpine:3.23.0
 
 EXPOSE 5353 8080
 

docker/ci/Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.22.1
+FROM alpine:3.23.0
 
 EXPOSE 5353 8080
 

dyndnsd.gemspec

@@ -46,6 +46,6 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'rspec'
   s.add_development_dependency 'rubocop', '~> 1.81.1'
   s.add_development_dependency 'rubocop-rake', '~> 0.7.1'
-  s.add_development_dependency 'rubocop-rspec', '~> 3.7.0'
+  s.add_development_dependency 'rubocop-rspec', '~> 3.8.0'
   s.add_development_dependency 'solargraph', '~> 0.55.0'
 end

lib/dyndnsd.rb

@@ -218,9 +218,22 @@ module Dyndnsd
       # we can trust this information since user was authorized by middleware
       user = env['REMOTE_USER']
 
-      # check for hostnames that the user does not own
-      forbidden_hostnames = hostnames - @users[user].fetch('hosts', [])
-      return [422, {'X-DynDNS-Response' => 'host_forbidden'}, []] if forbidden_hostnames.any?
+      if @users[user].key?('regex')
+        pattern = @users[user].fetch('regex')
+        begin
+          regex = Regexp.new(pattern, Regexp::IGNORECASE | Regexp::EXTENDED)
+        rescue RegexpError => e
+          Dyndnsd.logger.warn "Invalid regex pattern '#{pattern}': #{e.message}"
+          return [422, {'X-DynDNS-Response' => 'host_forbidden'}, []]
+        end
+        # check for hostnames that match the regex
+        matches = hostnames.any? { |str| regex.match?(str) }
+        return [422, {'X-DynDNS-Response' => 'host_forbidden'}, []] if !matches
+      else
+        # check for hostnames that the user does not own
+        forbidden_hostnames = hostnames - @users[user].fetch('hosts', [])
+        return [422, {'X-DynDNS-Response' => 'host_forbidden'}, []] if forbidden_hostnames.any?
+      end
 
       if params['offline'] == 'YES'
         myips = []

lib/dyndnsd/version.rb

@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module Dyndnsd
-  VERSION = '3.11.0'
+  VERSION = '3.12.0'
 end

spec/dyndnsd/daemon_spec.rb

@@ -18,6 +18,10 @@ describe Dyndnsd::Daemon do
         },
         'test2' => {
           'password' => 'ihavenohosts'
+        },
+        'test3' => {
+          'password' => 'superhypermegas3kurepassword1234',
+          'regex' => '^[a-z0-9]+-test3\.example\.org$'
         }
       }
     }
@@ -74,6 +78,22 @@ describe Dyndnsd::Daemon do
     expect(last_response.body).to eq("good 2001:db8::1\ngood 2001:db8::1")
   end
 
+  it 'supports regex matches for hostnames' do
+    authorize 'test3', 'superhypermegas3kurepassword1234'
+
+    get '/nic/update?hostname=abc123-test3.example.org&myip=1.2.3.4'
+    expect(last_response).to be_ok
+    expect(last_response.body).to eq('good 1.2.3.4')
+
+    get '/nic/update?hostname=foo-test3.example.org,bar-test3.example.org&myip=2001:db8::1'
+    expect(last_response).to be_ok
+    expect(last_response.body).to eq("good 2001:db8::1\ngood 2001:db8::1")
+
+    get '/nic/update?hostname=abc123.example.org'
+    expect(last_response).to be_ok
+    expect(last_response.body).to eq('nohost')
+  end
+
   it 'rejects request if one hostname is invalid' do
     authorize 'test', 'secret'
 
@@ -120,6 +140,10 @@ describe Dyndnsd::Daemon do
     get '/nic/update?hostname=foo.example.org,notmyhost.example.org'
     expect(last_response).to be_ok
     expect(last_response.body).to eq('nohost')
+
+    get '/nic/update?hostname=abc123-test3.example.org'
+    expect(last_response).to be_ok
+    expect(last_response.body).to eq('nohost')
   end
 
   it 'updates a host on IP change' do