93 lines
2.1 KiB
Go
93 lines
2.1 KiB
Go
package main
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import (
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"bufio"
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"fmt"
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"os"
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"strings"
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)
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var stdinReader = bufio.NewReader(os.Stdin)
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// prompt shows label with a "[current]" hint, reads one line, and returns
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// current unchanged if the user just presses enter.
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func prompt(label, current string) string {
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if current != "" {
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fmt.Printf("%s [%s]: ", label, current)
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} else {
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fmt.Printf("%s: ", label)
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}
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line, _ := stdinReader.ReadString('\n')
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line = strings.TrimSpace(line)
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if line == "" {
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return current
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}
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return line
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}
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// interactiveEdit implements the bare `ipadm <hostname>` form: add the host
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// if it doesn't exist yet, otherwise edit it in place. Returns the updated
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// host list, or an error if validation fails.
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func interactiveEdit(hosts []Host, name string, cfg netConfig) ([]Host, error) {
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if err := validateHostname(name); err != nil {
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return nil, err
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}
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idx := findHost(hosts, name)
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var cur Host
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if idx >= 0 {
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cur = hosts[idx]
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fmt.Printf("Bearbeite bestehenden Host %q (Enter = Wert behalten)\n", name)
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} else {
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cur = Host{Name: name}
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fmt.Printf("Neuer Host %q (Enter bei MAC/Comment = leer lassen)\n", name)
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}
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for {
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ip := prompt("IP-Adresse", cur.IP)
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if err := validateIP(ip, cfg.lanCIDR, cfg.poolStart, cfg.poolEnd); err != nil {
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fmt.Fprintln(os.Stderr, "Fehler:", err)
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continue
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}
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cur.IP = ip
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break
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}
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for {
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mac := prompt("MAC-Adresse (optional, '-' zum Löschen)", macOrDash(cur.MAC))
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if mac == "-" {
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mac = ""
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}
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norm, err := normalizeMAC(mac)
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if err != nil {
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fmt.Fprintln(os.Stderr, "Fehler:", err)
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continue
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}
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cur.MAC = norm
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break
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}
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cur.Comment = prompt("Kommentar", cur.Comment)
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if other := findByIP(hosts, cur.IP, idx); other >= 0 {
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return nil, fmt.Errorf("IP %s ist bereits Host %q zugewiesen", cur.IP, hosts[other].Name)
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}
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if other := findByMAC(hosts, cur.MAC, idx); other >= 0 {
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return nil, fmt.Errorf("MAC %s ist bereits Host %q zugewiesen", cur.MAC, hosts[other].Name)
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}
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if idx >= 0 {
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hosts[idx] = cur
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} else {
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hosts = append(hosts, cur)
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}
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return hosts, nil
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}
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func macOrDash(mac string) string {
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if mac == "" {
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return ""
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}
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return mac
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}
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