Anpassung Range-Conversion
All checks were successful
release-tag / release-image (push) Successful in 1m53s
All checks were successful
release-tag / release-image (push) Successful in 1m53s
This commit is contained in:
354
main.go
354
main.go
@@ -1,21 +1,22 @@
|
||||
// A small Go web‑server that converts an IPv4 address into an IPv6 address
|
||||
// A Go web‑server that converts IPv4 addresses into IPv6 addresses
|
||||
// inside a user‑defined /96 ULA prefix and outputs Windows 11‑ready fields.
|
||||
//
|
||||
// Features
|
||||
// --------
|
||||
// 1. Single conversion page (http://localhost:8080/) – converts one IPv4.
|
||||
// 2. Range conversion page (http://localhost:8080/range) – converts a span of IPv4s into a table.
|
||||
//
|
||||
// Environment variables (all optional):
|
||||
//
|
||||
// ULA_PREFIX – /96 prefix to embed into, default "fdcb:7de3:a12a:0::"
|
||||
// FORM_DEFAULT_IP - legt das Form Placeholder IP Feld fest (default: 172.16.0.0)
|
||||
// DNS1 – preferred DNS IPv6 address (default: <prefix with 1::53>)
|
||||
// DNS2 – alternate DNS IPv6 address (default: <prefix with 1::54>)
|
||||
// ULA_PREFIX – /96 prefix to embed into, default "fd09:cafe:affe:4010::"
|
||||
// DNS1 – preferred DNS IPv6 address (default: <prefix>::53)
|
||||
// DNS2 – alternate DNS IPv6 address (default: <prefix>::54)
|
||||
// FORM_DEFAULT_IP – placeholder for the single‑convert page, default 172.16.0.0
|
||||
// RANGE_LIMIT – max number of addresses allowed in /range (default 1024)
|
||||
//
|
||||
// Build & run:
|
||||
//
|
||||
// export ULA_PREFIX="fde5:1234:abcd:0::"
|
||||
// export DNS1="fde5:1234:abcd:1::53" # optional
|
||||
// export DNS2="fde5:1234:abcd:1::54" # optional
|
||||
// go run main.go
|
||||
//
|
||||
// Open http://localhost:8080 in a browser.
|
||||
package main
|
||||
|
||||
import (
|
||||
@@ -25,80 +26,170 @@ import (
|
||||
"net"
|
||||
"net/http"
|
||||
"os"
|
||||
"strconv"
|
||||
"strings"
|
||||
)
|
||||
|
||||
// ---------------------------------------------------------------------------
|
||||
// Configuration constants & globals
|
||||
// ---------------------------------------------------------------------------
|
||||
const (
|
||||
listenAddr = ":8080"
|
||||
defaultPrefix = "fd09:cafe:affe:4010::" // fallback /96
|
||||
prefixLen = 96 // fixed /96 mapping
|
||||
defaultIP = "172.16.0.0"
|
||||
defaultLimit = 1024 // max. rows for range conversion
|
||||
)
|
||||
|
||||
var (
|
||||
ulaPrefix string // effective /96 prefix (always ends with ::)
|
||||
dns1 string // preferred DNS
|
||||
dns2 string // alternate DNS
|
||||
ulaPrefix string
|
||||
dns1, dns2 string
|
||||
pageIP string
|
||||
pageTemplate *template.Template // compiled HTML template
|
||||
rangeLimit int
|
||||
singleTemplate *template.Template
|
||||
rangeTemplate *template.Template
|
||||
)
|
||||
|
||||
// viewData is passed into the template.
|
||||
type viewData struct {
|
||||
IPv4 string
|
||||
IPv6 string
|
||||
Gateway string
|
||||
DNS1 string
|
||||
DNS2 string
|
||||
// ---------------------------------------------------------------------------
|
||||
// Template data structures
|
||||
// ---------------------------------------------------------------------------
|
||||
type singleData struct {
|
||||
IPv4, IPv6, Gateway, DNS1, DNS2, Error string
|
||||
HaveResult bool
|
||||
}
|
||||
|
||||
type addrPair struct{ IPv4, IPv6 string }
|
||||
|
||||
type rangeData struct {
|
||||
Start, End string
|
||||
Rows []addrPair
|
||||
Error string
|
||||
HaveResult bool
|
||||
}
|
||||
|
||||
// ---------------------------------------------------------------------------
|
||||
// main – HTTP routing
|
||||
// ---------------------------------------------------------------------------
|
||||
func main() {
|
||||
initConfigAndTemplate()
|
||||
initConfigAndTemplates()
|
||||
|
||||
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
|
||||
renderPage(w, viewData{})
|
||||
})
|
||||
http.HandleFunc("/", handleSingle)
|
||||
http.HandleFunc("/convert", handleSingleConvert)
|
||||
http.HandleFunc("/range", handleRange)
|
||||
|
||||
http.HandleFunc("/convert", func(w http.ResponseWriter, r *http.Request) {
|
||||
log.Printf("Server läuft auf http://localhost%s (Präfix %s, DNS1 %s, DNS2 %s, Limit %d)", listenAddr, ulaPrefix, dns1, dns2, rangeLimit)
|
||||
log.Fatal(http.ListenAndServe(listenAddr, nil))
|
||||
}
|
||||
|
||||
// ---------------------------------------------------------------------------
|
||||
// Handlers – single conversion
|
||||
// ---------------------------------------------------------------------------
|
||||
func handleSingle(w http.ResponseWriter, r *http.Request) {
|
||||
renderSingle(w, singleData{})
|
||||
}
|
||||
|
||||
func handleSingleConvert(w http.ResponseWriter, r *http.Request) {
|
||||
if err := r.ParseForm(); err != nil {
|
||||
renderPage(w, viewData{Error: "Ungültiges Formular"})
|
||||
renderSingle(w, singleData{Error: "Ungültiges Formular"})
|
||||
return
|
||||
}
|
||||
ipv4Str := r.FormValue("ipv4")
|
||||
ipv6, err := embedIPv4(ipv4Str)
|
||||
data := viewData{IPv4: ipv4Str}
|
||||
d := singleData{IPv4: ipv4Str}
|
||||
if err != nil {
|
||||
data.Error = err.Error()
|
||||
d.Error = err.Error()
|
||||
} else {
|
||||
data.HaveResult = true
|
||||
data.IPv6 = ipv6
|
||||
data.Gateway = ulaPrefix + "1" // router IP = <prefix>::1
|
||||
data.DNS1 = dns1
|
||||
data.DNS2 = dns2
|
||||
d.HaveResult = true
|
||||
d.IPv6 = ipv6
|
||||
d.Gateway = ulaPrefix + "1"
|
||||
d.DNS1, d.DNS2 = dns1, dns2
|
||||
}
|
||||
renderPage(w, data)
|
||||
})
|
||||
|
||||
log.Printf("Server läuft auf http://localhost%s (Präfix %s, DNS1 %s, DNS2 %s)", listenAddr, ulaPrefix, dns1, dns2)
|
||||
log.Fatal(http.ListenAndServe(listenAddr, nil))
|
||||
renderSingle(w, d)
|
||||
}
|
||||
|
||||
// initConfigAndTemplate reads env vars and prepares HTML template.
|
||||
func initConfigAndTemplate() {
|
||||
// ---- ULA prefix -------------------------------------------------------
|
||||
// ---------------------------------------------------------------------------
|
||||
// Handlers – range conversion
|
||||
// ---------------------------------------------------------------------------
|
||||
func handleRange(w http.ResponseWriter, r *http.Request) {
|
||||
switch r.Method {
|
||||
case http.MethodGet:
|
||||
renderRange(w, rangeData{})
|
||||
return
|
||||
case http.MethodPost:
|
||||
if err := r.ParseForm(); err != nil {
|
||||
renderRange(w, rangeData{Error: "Ungültiges Formular"})
|
||||
return
|
||||
}
|
||||
startStr := r.FormValue("start")
|
||||
endStr := r.FormValue("end")
|
||||
rows, err := convertRange(startStr, endStr)
|
||||
d := rangeData{Start: startStr, End: endStr}
|
||||
if err != nil {
|
||||
d.Error = err.Error()
|
||||
} else {
|
||||
d.HaveResult = true
|
||||
d.Rows = rows
|
||||
}
|
||||
renderRange(w, d)
|
||||
default:
|
||||
http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
|
||||
}
|
||||
}
|
||||
|
||||
// convertRange returns slice of addrPairs for every IPv4 in [start,end].
|
||||
func convertRange(start, end string) ([]addrPair, error) {
|
||||
sip := net.ParseIP(start).To4()
|
||||
eip := net.ParseIP(end).To4()
|
||||
if sip == nil || eip == nil {
|
||||
return nil, fmt.Errorf("start oder ende ist keine gültige ipv4-adresse")
|
||||
}
|
||||
su := ipToUint32(sip)
|
||||
eu := ipToUint32(eip)
|
||||
if su > eu {
|
||||
return nil, fmt.Errorf("start darf nicht größer als ende sein")
|
||||
}
|
||||
count := int(eu - su + 1)
|
||||
if count > rangeLimit {
|
||||
return nil, fmt.Errorf("bereich zu groß (%d > %d)", count, rangeLimit)
|
||||
}
|
||||
rows := make([]addrPair, 0, count)
|
||||
for cur := su; cur <= eu; cur++ {
|
||||
ipv4 := uint32ToIP(cur).String()
|
||||
ipv6, _ := embedIPv4(ipv4) // embedIPv4 kann hier nicht mehr fehlschlagen
|
||||
rows = append(rows, addrPair{IPv4: ipv4, IPv6: ipv6})
|
||||
}
|
||||
return rows, nil
|
||||
}
|
||||
|
||||
// ---------------------------------------------------------------------------
|
||||
// Helper functions
|
||||
// ---------------------------------------------------------------------------
|
||||
func embedIPv4(ipv4 string) (string, error) {
|
||||
ip := net.ParseIP(ipv4).To4()
|
||||
if ip == nil {
|
||||
return "", fmt.Errorf("%s ist keine gültige IPv4-Adresse", ipv4)
|
||||
}
|
||||
hi := uint16(ip[0])<<8 | uint16(ip[1])
|
||||
lo := uint16(ip[2])<<8 | uint16(ip[3])
|
||||
return fmt.Sprintf("%s%x:%x", ulaPrefix, hi, lo), nil
|
||||
}
|
||||
|
||||
func ipToUint32(ip net.IP) uint32 {
|
||||
return uint32(ip[0])<<24 | uint32(ip[1])<<16 | uint32(ip[2])<<8 | uint32(ip[3])
|
||||
}
|
||||
|
||||
func uint32ToIP(u uint32) net.IP {
|
||||
return net.IPv4(byte(u>>24), byte(u>>16), byte(u>>8), byte(u))
|
||||
}
|
||||
|
||||
// ---------------------------------------------------------------------------
|
||||
// Config & templates
|
||||
// ---------------------------------------------------------------------------
|
||||
func initConfigAndTemplates() {
|
||||
// ULA prefix ---------------------------------
|
||||
ulaPrefix = os.Getenv("ULA_PREFIX")
|
||||
if ulaPrefix == "" {
|
||||
ulaPrefix = defaultPrefix
|
||||
}
|
||||
|
||||
pageIP = os.Getenv("FORM_DEFAULT_IP")
|
||||
if pageIP == "" {
|
||||
pageIP = defaultIP
|
||||
}
|
||||
|
||||
// ensure trailing :: so we can simply append hex words
|
||||
if !strings.HasSuffix(ulaPrefix, "::") {
|
||||
if strings.HasSuffix(ulaPrefix, ":") {
|
||||
ulaPrefix += ":"
|
||||
@@ -107,11 +198,9 @@ func initConfigAndTemplate() {
|
||||
}
|
||||
}
|
||||
|
||||
// ---- DNS addresses ----------------------------------------------------
|
||||
// DNS defaults --------------------------------
|
||||
dns1 = os.Getenv("DNS1")
|
||||
dns2 = os.Getenv("DNS2")
|
||||
|
||||
// default DNS: change subnet 0 → 1 and append ::53 / ::54
|
||||
if dns1 == "" {
|
||||
dns1 = strings.Replace(ulaPrefix, "::", "::53", 1)
|
||||
}
|
||||
@@ -119,96 +208,109 @@ func initConfigAndTemplate() {
|
||||
dns2 = strings.Replace(ulaPrefix, "::", "::54", 1)
|
||||
}
|
||||
|
||||
// ---- HTML template ----------------------------------------------------
|
||||
html := fmt.Sprintf(`<!DOCTYPE html>
|
||||
// Placeholder IP ------------------------------
|
||||
pageIP = os.Getenv("FORM_DEFAULT_IP")
|
||||
if pageIP == "" {
|
||||
pageIP = defaultIP
|
||||
}
|
||||
|
||||
// Range limit ---------------------------------
|
||||
if limStr := os.Getenv("RANGE_LIMIT"); limStr != "" {
|
||||
if v, err := strconv.Atoi(limStr); err == nil && v > 0 {
|
||||
rangeLimit = v
|
||||
} else {
|
||||
rangeLimit = defaultLimit
|
||||
}
|
||||
} else {
|
||||
rangeLimit = defaultLimit
|
||||
}
|
||||
|
||||
// Templates -----------------------------------
|
||||
singleHTML := fmt.Sprintf(singlePageHTML, pageIP, ulaPrefix)
|
||||
rangeHTML := fmt.Sprintf(rangePageHTML, ulaPrefix)
|
||||
singleTemplate = template.Must(template.New("single").Parse(singleHTML))
|
||||
rangeTemplate = template.Must(template.New("range").Parse(rangeHTML))
|
||||
}
|
||||
|
||||
// ---------------------------------------------------------------------------
|
||||
// Template rendering helpers
|
||||
// ---------------------------------------------------------------------------
|
||||
func renderSingle(w http.ResponseWriter, d singleData) {
|
||||
w.Header().Set("Content-Type", "text/html; charset=utf-8")
|
||||
_ = singleTemplate.Execute(w, d)
|
||||
}
|
||||
|
||||
func renderRange(w http.ResponseWriter, d rangeData) {
|
||||
w.Header().Set("Content-Type", "text/html; charset=utf-8")
|
||||
_ = rangeTemplate.Execute(w, d)
|
||||
}
|
||||
|
||||
// ---------------------------------------------------------------------------
|
||||
// HTML templates as raw strings with %s placeholders (prefix, etc.)
|
||||
// ---------------------------------------------------------------------------
|
||||
var singlePageHTML = `<!DOCTYPE html>
|
||||
<html lang="de">
|
||||
<head>
|
||||
<meta charset="utf-8" />
|
||||
<title>IPv4 → IPv6‑Mapper</title>
|
||||
<style>
|
||||
body{font-family:system-ui,sans-serif;margin:2rem;max-width:46rem}
|
||||
form{display:flex;gap:.5rem;flex-wrap:wrap}
|
||||
form{display:flex;gap:.5rem;flex-wrap:wrap;margin-bottom:1rem}
|
||||
input[type=text],input[readonly]{padding:.4rem;font-size:1rem;border:1px solid #ccc;border-radius:4px;flex:1}
|
||||
button{padding:.5rem 1rem;font-size:1rem;cursor:pointer;border-radius:4px;border:1px solid #666;background:#eee}
|
||||
button.copy{padding:.3rem .6rem;font-size:.9rem;margin-left:.3rem;background:#def}
|
||||
#result{margin-top:1.5rem}
|
||||
.row{display:flex;align-items:center;margin-bottom:.4rem}
|
||||
.row label{width:14rem}
|
||||
</style>
|
||||
<script>
|
||||
async function copy(id){
|
||||
const val=document.getElementById(id).value;
|
||||
await navigator.clipboard.writeText(val);
|
||||
const btn=document.getElementById(id+"Btn");
|
||||
const old=btn.textContent;
|
||||
btn.textContent="✔ kopiert";
|
||||
setTimeout(()=>btn.textContent=old,1200);
|
||||
}
|
||||
</script>
|
||||
</head>
|
||||
<body>
|
||||
<h1>IPv4 → IPv6‑Mapper</h1>
|
||||
<script>async function copy(id){const v=document.getElementById(id).value;await navigator.clipboard.writeText(v);const b=document.getElementById(id+'Btn');const o=b.textContent;b.textContent='✔';setTimeout(()=>b.textContent=o,1200);}</script>
|
||||
</head><body>
|
||||
<h1>IPv4 → IPv6 (einzeln)</h1>
|
||||
<form action="/convert" method="post">
|
||||
<input type="text" name="ipv4" placeholder="%s" value="{{.IPv4}}" required />
|
||||
<button type="submit">Umrechnen</button>
|
||||
<input name="ipv4" type="text" placeholder="%s" value="{{.IPv4}}" required />
|
||||
<button>Umrechnen</button>
|
||||
<a href="/range" style="margin-left:1rem">» Bereich konvertieren</a>
|
||||
</form>
|
||||
|
||||
{{if .HaveResult}}
|
||||
<div id="result">
|
||||
<div>
|
||||
<h2>Windows 11‑Eingaben</h2>
|
||||
<div class="row">
|
||||
<label for="ip">IP‑Adresse</label>
|
||||
<input readonly id="ip" value="{{.IPv6}}" />
|
||||
<button type="button" class="copy" id="ipBtn" onclick="copy('ip')">Kopieren</button>
|
||||
</div>
|
||||
<div class="row">
|
||||
<label for="pl">Subnetzpräfixlänge</label>
|
||||
<input readonly id="pl" value="96" />
|
||||
<button type="button" class="copy" id="plBtn" onclick="copy('pl')">Kopieren</button>
|
||||
</div>
|
||||
<div class="row">
|
||||
<label for="gw">Gateway (Bleibt vorerst leer!)</label>
|
||||
<input readonly id="gw" value="{{.Gateway}}" />
|
||||
<button type="button" class="copy" id="gwBtn" onclick="copy('gw')">Kopieren</button>
|
||||
</div>
|
||||
<div class="row">
|
||||
<label for="dns1">Bevorzugter DNS</label>
|
||||
<input readonly id="dns1" value="{{.DNS1}}" />
|
||||
<button type="button" class="copy" id="dns1Btn" onclick="copy('dns1')">Kopieren</button>
|
||||
</div>
|
||||
<div class="row">
|
||||
<label for="dns2">Alternativer DNS</label>
|
||||
<input readonly id="dns2" value="{{.DNS2}}" />
|
||||
<button type="button" class="copy" id="dns2Btn" onclick="copy('dns2')">Kopieren</button>
|
||||
</div>
|
||||
<div class="row"><label>IP‑Adresse</label><input readonly id="ip" value="{{.IPv6}}"><button type="button" class="copy" id="ipBtn" onclick="copy('ip')">Copy</button></div>
|
||||
<div class="row"><label>Subnetzpräfix</label><input readonly id="pl" value="96"><button type="button" class="copy" id="plBtn" onclick="copy('pl')">Copy</button></div>
|
||||
<div class="row"><label>Gateway</label><input readonly id="gw" value="{{.Gateway}}"><button type="button" class="copy" id="gwBtn" onclick="copy('gw')">Copy</button></div>
|
||||
<div class="row"><label>DNS bevorzugt</label><input readonly id="dns1" value="{{.DNS1}}"><button type="button" class="copy" id="dns1Btn" onclick="copy('dns1')">Copy</button></div>
|
||||
<div class="row"><label>DNS alternativ</label><input readonly id="dns2" value="{{.DNS2}}"><button type="button" class="copy" id="dns2Btn" onclick="copy('dns2')">Copy</button></div>
|
||||
</div>
|
||||
{{end}}
|
||||
{{if .Error}}<p style="color:#b00">Fehler: {{.Error}}</p>{{end}}
|
||||
<p style="margin-top:1rem">Aktives Präfix: <code>%s</code> (/96)</p>
|
||||
</body></html>`
|
||||
|
||||
{{if .Error}}
|
||||
<p style="color:#b00">Fehler: {{.Error}}</p>
|
||||
var rangePageHTML = `<!DOCTYPE html>
|
||||
<html lang="de">
|
||||
<head>
|
||||
<meta charset="utf-8" />
|
||||
<title>IPv4‑Range → IPv6</title>
|
||||
<style>
|
||||
body{font-family:system-ui,sans-serif;margin:2rem;max-width:60rem}
|
||||
table{border-collapse:collapse;width:100%}
|
||||
th,td{border:1px solid #ccc;padding:.4rem;text-align:left;font-family:monospace}
|
||||
form{display:flex;gap:.5rem;flex-wrap:wrap;margin-bottom:1rem}
|
||||
input[type=text]{padding:.4rem;font-size:1rem;border:1px solid #ccc;border-radius:4px;flex:1}
|
||||
button{padding:.5rem 1rem;font-size:1rem;cursor:pointer;border-radius:4px;border:1px solid #666;background:#eee}
|
||||
</style>
|
||||
</head><body>
|
||||
<h1>IPv4‑Bereich → IPv6‑Tabelle</h1>
|
||||
<form action="/range" method="post">
|
||||
<input name="start" type="text" placeholder="Start‑IPv4" value="{{.Start}}" required />
|
||||
<input name="end" type="text" placeholder="End‑IPv4" value="{{.End}}" required />
|
||||
<button>Konvertieren</button>
|
||||
<a href="/" style="margin-left:1rem">« Einzelkonverter</a>
|
||||
</form>
|
||||
{{if .HaveResult}}
|
||||
<table>
|
||||
<tr><th>IPv4</th><th>IPv6</th></tr>
|
||||
{{range .Rows}}<tr><td>{{.IPv4}}</td><td>{{.IPv6}}</td></tr>{{end}}
|
||||
</table>
|
||||
{{end}}
|
||||
|
||||
<p style="margin-top:1.5rem">Aktives Präfix: <code>%s</code> (/96)</p>
|
||||
</body>
|
||||
</html>`, pageIP, ulaPrefix)
|
||||
|
||||
pageTemplate = template.Must(template.New("page").Parse(html))
|
||||
}
|
||||
|
||||
// embedIPv4 converts a dotted IPv4 string into an IPv6 address within ulaPrefix/96.
|
||||
func embedIPv4(ipv4 string) (string, error) {
|
||||
ip := net.ParseIP(ipv4).To4()
|
||||
if ip == nil {
|
||||
return "", fmt.Errorf("'%s' ist keine gültige IPv4-Adresse", ipv4)
|
||||
}
|
||||
hi := uint16(ip[0])<<8 | uint16(ip[1])
|
||||
lo := uint16(ip[2])<<8 | uint16(ip[3])
|
||||
return fmt.Sprintf("%s%x:%x", ulaPrefix, hi, lo), nil
|
||||
}
|
||||
|
||||
func renderPage(w http.ResponseWriter, d viewData) {
|
||||
w.Header().Set("Content-Type", "text/html; charset=utf-8")
|
||||
if err := pageTemplate.Execute(w, d); err != nil {
|
||||
http.Error(w, err.Error(), http.StatusInternalServerError)
|
||||
}
|
||||
}
|
||||
{{if .Error}}<p style="color:#b00">Fehler: {{.Error}}</p>{{end}}
|
||||
<p style="margin-top:1rem">Aktives Präfix: <code>%s</code> (/96)</p>
|
||||
</body></html>`
|
||||
|
||||
Reference in New Issue
Block a user