feat(netconf): add input validation, 'b' to go back, 'a' to abort
- All prompts accept 'a' = abort, 'b' = back to previous step - Interface input: validate numeric range and name existence, re-prompt on bad input - IP address: regex check x.x.x.x/prefix format - Gateway: regex check x.x.x.x format - Main loop: 'b' at mode selection goes back to interface list Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
@@ -1,61 +1,163 @@
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#!/bin/sh
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# Quick network configurator for the local console.
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# Type 'a' at any prompt to abort, 'b' to go back.
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set -e
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# List interfaces (exclude lo)
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IFACES=$(ip -o link show | awk -F': ' '$2 != "lo" {print $2}' | cut -d@ -f1)
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abort() { echo "Aborted."; exit 0; }
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echo "Interfaces:"
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i=1
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for iface in $IFACES; do
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ip=$(ip -4 addr show "$iface" 2>/dev/null | awk '/inet /{print $2}' | head -1)
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echo " $i) $iface ${ip:-no IP}"
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i=$((i+1))
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done
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echo ""
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printf "Interface number or name [Enter = first]: "
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read INPUT
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ask() {
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# ask VARNAME "prompt" [default]
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# Sets VARNAME. Returns 1 on 'b' (back), calls abort on 'a'.
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_var="$1"; _prompt="$2"; _default="$3"
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while true; do
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if [ -n "$_default" ]; then
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printf "%s [%s] (b=back a=abort): " "$_prompt" "$_default"
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else
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printf "%s (b=back a=abort): " "$_prompt"
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fi
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read _input
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case "$_input" in
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a|A) abort ;;
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b|B) return 1 ;;
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"")
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if [ -n "$_default" ]; then
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eval "$_var=\"\$_default\""
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return 0
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else
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echo " Required — please enter a value."
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fi
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;;
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*)
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eval "$_var=\"\$_input\""
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return 0
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;;
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esac
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done
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}
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if [ -z "$INPUT" ]; then
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IFACE=$(echo "$IFACES" | head -1)
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elif echo "$INPUT" | grep -qE '^[0-9]+$'; then
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# Numeric input — resolve to name
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IFACE=$(echo "$IFACES" | awk "NR==$INPUT")
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if [ -z "$IFACE" ]; then
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echo "Error: no interface with number $INPUT"
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# ── Step 1: choose interface ───────────────────────────────────────────────────
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choose_iface() {
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IFACES=$(ip -o link show | awk -F': ' '$2 != "lo" {print $2}' | cut -d@ -f1)
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if [ -z "$IFACES" ]; then
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echo "No network interfaces found."
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exit 1
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fi
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else
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IFACE="$INPUT"
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fi
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echo "Selected: $IFACE"
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echo ""
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echo " 1) DHCP"
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echo " 2) Static"
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printf "Mode [1]: "
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read MODE
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MODE=${MODE:-1}
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echo ""
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echo "Interfaces:"
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i=1
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for iface in $IFACES; do
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ip=$(ip -4 addr show "$iface" 2>/dev/null | awk '/inet /{print $2}' | head -1)
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echo " $i) $iface ${ip:-no IP}"
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i=$((i+1))
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done
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echo ""
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if [ "$MODE" = "1" ]; then
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FIRST=$(echo "$IFACES" | head -1)
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while true; do
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printf "Interface number or name [%s] (a=abort): " "$FIRST"
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read INPUT
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case "$INPUT" in
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a|A) abort ;;
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"")
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IFACE="$FIRST"
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break
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;;
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*)
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if echo "$INPUT" | grep -qE '^[0-9]+$'; then
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IFACE=$(echo "$IFACES" | awk "NR==$INPUT")
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if [ -z "$IFACE" ]; then
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echo " No interface #$INPUT — try again."
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continue
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fi
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else
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# Validate name exists
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if ! echo "$IFACES" | grep -qx "$INPUT"; then
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echo " Unknown interface '$INPUT' — try again."
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continue
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fi
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IFACE="$INPUT"
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fi
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break
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;;
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esac
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done
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echo "Selected: $IFACE"
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}
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# ── Step 2: choose mode ────────────────────────────────────────────────────────
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choose_mode() {
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echo ""
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echo " 1) DHCP"
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echo " 2) Static IP"
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echo ""
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while true; do
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printf "Mode [1] (b=back a=abort): "
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read INPUT
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case "$INPUT" in
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a|A) abort ;;
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b|B) return 1 ;;
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""|1) MODE=dhcp; break ;;
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2) MODE=static; break ;;
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*) echo " Enter 1 or 2." ;;
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esac
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done
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}
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# ── Step 3a: DHCP ─────────────────────────────────────────────────────────────
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run_dhcp() {
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echo "Running DHCP on $IFACE..."
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dhclient -v "$IFACE"
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else
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printf "IP address (e.g. 192.168.1.100/24): "
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read ADDR
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printf "Gateway (e.g. 192.168.1.1): "
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read GW
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printf "DNS [8.8.8.8]: "
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read DNS
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DNS=${DNS:-8.8.8.8}
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}
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# ── Step 3b: Static ───────────────────────────────────────────────────────────
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run_static() {
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while true; do
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ask ADDR "IP address (e.g. 192.168.1.100/24)" || return 1
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# Basic format check: must contain a dot and a /
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if ! echo "$ADDR" | grep -qE '^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+/[0-9]+$'; then
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echo " Invalid format — use x.x.x.x/prefix (e.g. 192.168.1.10/24)."
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continue
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fi
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break
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done
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while true; do
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ask GW "Gateway (e.g. 192.168.1.1)" || return 1
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if ! echo "$GW" | grep -qE '^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+$'; then
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echo " Invalid IP address."
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continue
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fi
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break
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done
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ask DNS "DNS server" "8.8.8.8" || return 1
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ip addr flush dev "$IFACE"
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ip addr add "$ADDR" dev "$IFACE"
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ip link set "$IFACE" up
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ip route add default via "$GW"
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ip route add default via "$GW" 2>/dev/null || true
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echo "nameserver $DNS" > /etc/resolv.conf
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echo "Done."
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fi
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}
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# ── Main loop ─────────────────────────────────────────────────────────────────
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choose_iface
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while true; do
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choose_mode || { choose_iface; continue; }
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if [ "$MODE" = "dhcp" ]; then
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run_dhcp && break
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else
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run_static && break || continue
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fi
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done
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echo ""
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ip -4 addr show "$IFACE"
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