init
This commit is contained in:
51
.gitea/workflows/release.yml
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51
.gitea/workflows/release.yml
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name: release-tag
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on:
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push:
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branches:
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- 'main'
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jobs:
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release-image:
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runs-on: ubuntu-fast
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env:
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DOCKER_ORG: ${{ vars.DOCKER_ORG }}
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DOCKER_LATEST: latest
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RUNNER_TOOL_CACHE: /toolcache
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steps:
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- name: Checkout
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uses: actions/checkout@v3
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- name: Set up QEMU
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uses: docker/setup-qemu-action@v2
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- name: Set up Docker BuildX
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uses: docker/setup-buildx-action@v2
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with: # replace it with your local IP
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config-inline: |
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[registry."${{ vars.DOCKER_REGISTRY }}"]
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http = true
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insecure = true
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- name: Login to DockerHub
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uses: docker/login-action@v2
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with:
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registry: ${{ vars.DOCKER_REGISTRY }} # replace it with your local IP
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username: ${{ secrets.DOCKER_USERNAME }}
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password: ${{ secrets.DOCKER_PASSWORD }}
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- name: Get Meta
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id: meta
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run: |
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echo REPO_NAME=$(echo ${GITHUB_REPOSITORY} | awk -F"/" '{print $2}') >> $GITHUB_OUTPUT
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echo REPO_VERSION=$(git describe --tags --always | sed 's/^v//') >> $GITHUB_OUTPUT
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- name: Build and push
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uses: docker/build-push-action@v4
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with:
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context: .
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file: ./Dockerfile
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platforms: |
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linux/amd64
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push: true
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tags: | # replace it with your local IP and tags
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${{ vars.DOCKER_REGISTRY }}/${{ env.DOCKER_ORG }}/${{ steps.meta.outputs.REPO_NAME }}:${{ steps.meta.outputs.REPO_VERSION }}
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${{ vars.DOCKER_REGISTRY }}/${{ env.DOCKER_ORG }}/${{ steps.meta.outputs.REPO_NAME }}:${{ env.DOCKER_LATEST }}
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8
Dockerfile
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8
Dockerfile
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FROM golang:1.24.1
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WORKDIR /app
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COPY go.mod ./
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RUN go mod download
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COPY *.go ./
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RUN CGO_ENABLED=0 GOOS=linux go build -o /goprg
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EXPOSE 8080
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CMD ["/goprg"]
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3
go.mod
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3
go.mod
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module git.send.nrw/StadtHilden/ipv6calculator
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go 1.23.1
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96
main.go
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96
main.go
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package main
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import (
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"fmt"
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"html/template"
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"log"
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"net"
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"net/http"
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)
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const (
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listenAddr = ":8080" // server port
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ulaPrefix = "fdcb:7de3:a12a:0::" // fixed ULA /96 prefix
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)
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// pageTemplate is served for both GET (empty result) and POST (with result).
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var pageTemplate = template.Must(template.New("page").Parse(`<!DOCTYPE html>
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<html lang="de">
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<head>
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<meta charset="utf-8"/>
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<title>IPv4 → IPv6‑Mapper</title>
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<style>
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body { font-family: system-ui, sans-serif; margin: 2rem; }
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form { display:flex; gap:.5rem; }
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input[type=text] { flex:1; padding:.4rem; font-size:1rem; }
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button { padding:.5rem 1rem; font-size:1rem; cursor:pointer; }
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#result { margin-top:1.5rem; font-weight:bold; }
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.error { color:#b00; }
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</style>
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</head>
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<body>
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<h1>IPv4 → IPv6‑Mapper</h1>
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<form action="/convert" method="post">
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<input type="text" name="ipv4" placeholder="172.29.0.0" value="{{.IPv4}}" required />
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<button type="submit">Umrechnen</button>
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</form>
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{{if .IPv6}}
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<div id="result">IPv6‑Adresse: <code>{{.IPv6}}</code></div>
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{{end}}
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{{if .Error}}
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<div class="error">Fehler: {{.Error}}</div>
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{{end}}
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<p>Präfix: <code>` + ulaPrefix + `</code> (feste /96‑Zuordnung)</p>
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</body>
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</html>`))
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// viewData transports data into the page template.
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type viewData struct {
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IPv4 string
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IPv6 string
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Error string
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}
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func main() {
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http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
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// Empty page on root
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renderPage(w, viewData{})
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})
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http.HandleFunc("/convert", func(w http.ResponseWriter, r *http.Request) {
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if err := r.ParseForm(); err != nil {
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renderPage(w, viewData{Error: "Ungültiges Formular"})
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return
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}
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ipv4Str := r.FormValue("ipv4")
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ipv6, err := embedIPv4(ipv4Str)
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data := viewData{IPv4: ipv4Str}
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if err != nil {
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data.Error = err.Error()
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} else {
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data.IPv6 = ipv6
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}
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renderPage(w, data)
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})
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log.Printf("Server läuft auf http://localhost%s …", listenAddr)
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log.Fatal(http.ListenAndServe(listenAddr, nil))
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}
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// embedIPv4 converts an IPv4 dotted string into the ulaPrefix‑based IPv6 address.
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func embedIPv4(ipv4 string) (string, error) {
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ip := net.ParseIP(ipv4).To4()
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if ip == nil {
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return "", fmt.Errorf("'%s' ist keine gültige IPv4‑Adresse", ipv4)
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}
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first := uint16(ip[0])<<8 | uint16(ip[1]) // High 16 bits
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second := uint16(ip[2])<<8 | uint16(ip[3]) // Low 16 bits
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return fmt.Sprintf("%s%x:%x", ulaPrefix, first, second), nil
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}
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func renderPage(w http.ResponseWriter, d viewData) {
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w.Header().Set("Content-Type", "text/html; charset=utf-8")
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if err := pageTemplate.Execute(w, d); err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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}
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}
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