Adding upstream version 2.3.1.

Signed-off-by: Daniel Baumann <daniel@debian.org>

.github/workflows/codeql.yml

@@ -0,0 +1,56 @@
+name: "CodeQL"
+
+on:
+  push:
+    branches: [ "develop", "master" ]
+  pull_request:
+    branches: [ "develop" ]
+  schedule:
+    - cron: "53 20 * * 4"
+
+jobs:
+  analyze:
+    name: Analyze
+    runs-on: ubuntu-latest
+    permissions:
+      actions: read
+      contents: read
+      security-events: write
+
+    strategy:
+      fail-fast: false
+      matrix:
+        language: [ cpp, python ]
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          submodules: recursive
+
+      - name: Install Packages (cpp)
+        if: ${{ matrix.language == 'cpp' }}
+        run: |
+          sudo add-apt-repository --yes ppa:dns-oarc/dnscap-pr
+          sudo apt-get update
+          sudo apt-get install --yes build-essential automake autoconf libtool pkg-config libpcap-dev libldns-dev libyaml-perl zlib1g-dev libssl-dev libcryptopant-dev
+
+      - name: Configure (cpp)
+        if: ${{ matrix.language == 'cpp' }}
+        run: |
+          ./autogen.sh
+          ./configure
+
+      - name: Initialize CodeQL
+        uses: github/codeql-action/init@v3
+        with:
+          languages: ${{ matrix.language }}
+          queries: +security-and-quality
+
+      - name: Autobuild
+        uses: github/codeql-action/autobuild@v3
+
+      - name: Perform CodeQL Analysis
+        uses: github/codeql-action/analyze@v3
+        with:
+          category: "/language:${{ matrix.language }}"