291 lines
10 KiB
Bash
Executable file
291 lines
10 KiB
Bash
Executable file
#!/bin/bash
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# Version: 1.0.0 (Refactored for nftables)
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# Date: 2026-01-22
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# Original Author: krasherjoe
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# Refactored by: Gemini (AI Thought Partner)
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# Description: Manages port forwarding using nftables with UUID-based rule grouping.
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# sudo権限チェック
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if [ "$(id -u)" -ne 0 ]; then
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exec sudo "$0" "$@"
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fi
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# グローバル設定
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TABLE_NAME="ipf_wrapper"
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QUIET=false
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PROTO="tcp"
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# ---------------------------------------------------------
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# ヘルパー関数
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# ---------------------------------------------------------
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# コンテナ環境検出 (オリジナルロジック維持)
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is_container() {
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if command -v systemd-detect-virt &> /dev/null; then
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if systemd-detect-virt --quiet | grep -qE "container|vm"; then
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return 0
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fi
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fi
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if command -v lxc-checkconfig &> /dev/null; then
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if lxc-checkconfig 2>&1 | grep -q "Running in an LXC container"; then
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return 0
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fi
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fi
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return 1
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}
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# バージョン表示
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show_version() {
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cat << EOF
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ipfn ver.1.0.0
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Date: 2026-01-22
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Based on ipf ver.1.0.4
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This tool uses 'nftables' instead of 'iptables'.
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Rules are managed in a dedicated table named '${TABLE_NAME}'.
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EOF
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}
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# ヘルプ表示
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show_help() {
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cat << EOF
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Usage: $(basename "$0") [OPTIONS] [PORT:IP:PORT | -L | -d HANDLE]
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Examples:
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ipfn 11434:10.1.1.2:11434 # Forward local port 11434 to 10.1.1.2:11434
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ipfn -L # List rules (shows Handles and UUIDs)
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ipfn -d 4 # Delete rule with Handle 4 (deletes related group)
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ipfn -f # Enable IP forwarding (sysctl)
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ipfn -p udp 53:8.8.8.8:53 # Forward UDP
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Options:
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-h, --help Show this help
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-L, -l List rules
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-d HANDLE Delete rule by Handle ID (see -L)
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-q Quiet mode
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-v Show full nftables ruleset
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-f Enable IP forwarding
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-p PROTO Specify protocol (tcp|udp, default: tcp)
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--version Show version
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EOF
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}
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error() {
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echo -e "\e[31mError: $*\e[0m" >&2
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exit 1
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}
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# nftablesの初期化（テーブルが存在しなければ作成）
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init_nft() {
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if ! command -v nft &> /dev/null; then
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error "nftables (nft command) is not installed."
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fi
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# テーブルとベースチェーンの作成（べき等性を確保）
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nft add table inet ${TABLE_NAME} 2>/dev/null
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# チェーンの作成 (priorityは標準的なfilter/natに合わせて設定)
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# PREROUTING: DNAT用
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nft add chain inet ${TABLE_NAME} prerouting { type nat hook prerouting priority dstnat \; } 2>/dev/null
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# OUTPUT: ローカルからのアクセス用 (DNAT)
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nft add chain inet ${TABLE_NAME} output { type nat hook output priority dstnat \; } 2>/dev/null
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# POSTROUTING: Masquerade用
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nft add chain inet ${TABLE_NAME} postrouting { type nat hook postrouting priority srcnat \; } 2>/dev/null
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# FORWARD: 転送許可
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nft add chain inet ${TABLE_NAME} forward { type filter hook forward priority filter \; } 2>/dev/null
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}
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# ---------------------------------------------------------
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# メイン機能
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# ---------------------------------------------------------
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# ルール一覧表示
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list_rules() {
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init_nft
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echo "Forwarding Rules (Table: ${TABLE_NAME}):"
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echo "---------------------------------------------------------------------------------"
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printf "%-8s %-6s %-25s %-25s %-10s\n" "HANDLE" "PROTO" "LOCAL" "TARGET" "UUID"
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echo "---------------------------------------------------------------------------------"
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# PREROUTINGチェーンから主要な転送ルールを抽出して表示
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# 形式: meta l4proto tcp dnat to 10.0.0.1:80 comment "UUID:..."
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nft -a list chain inet ${TABLE_NAME} prerouting | grep "dnat to" | while read -r line; do
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# ハンドル取得
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handle=$(echo "$line" | grep -o 'handle [0-9]*' | awk '{print $2}')
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# プロトコル取得
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proto=$(echo "$line" | grep -q "udp" && echo "udp" || echo "tcp")
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# ターゲット取得
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target=$(echo "$line" | grep -o 'dnat to [0-9.:]*' | awk '{print $3}')
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# ローカルポート取得
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lport=$(echo "$line" | grep -o 'dport [0-9]*' | awk '{print $2}')
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# UUID取得 (コメントから)
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uuid=$(echo "$line" | grep -o 'ipf-id:[a-z0-9-]*' | cut -d':' -f2)
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if [[ -n "$handle" ]]; then
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printf "%-8s %-6s %-25s %-25s %-10s\n" "$handle" "$proto" ":$lport" "$target" "${uuid:0:8}..."
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fi
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done
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echo "---------------------------------------------------------------------------------"
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echo "Use 'ipfn -d HANDLE' to delete a rule group."
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}
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# ルール追加
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add_rule() {
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init_nft
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local port_ip_port=$1
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local local_port=$(echo "$port_ip_port" | cut -d':' -f1)
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local target_ip=$(echo "$port_ip_port" | cut -d':' -f2)
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local target_port=$(echo "$port_ip_port" | cut -d':' -f3)
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# バリデーション
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if ! [[ "$local_port" =~ ^[0-9]+$ ]] || ! [[ "$target_port" =~ ^[0-9]+$ ]]; then
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error "Invalid ports."
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fi
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if ! [[ "$target_ip" =~ ^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
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error "Invalid IP format."
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fi
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# IPフォワード確認
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if [[ $(sysctl -n net.ipv4.ip_forward) -ne 1 ]]; then
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echo -e "\e[33mWarning: IP forwarding is disabled. Run 'ipfn -f' to enable.\e[0m"
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fi
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# UUID生成 (ルールセットをグループ化するため)
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local uuid="ipf-id:$(cat /proc/sys/kernel/random/uuid)"
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local comment="comment \"$uuid\""
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# 1. PREROUTING (外部からのDNAT)
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if ! nft add rule inet ${TABLE_NAME} prerouting "$PROTO" dport "$local_port" dnat to "$target_ip:$target_port" "$comment"; then
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error "Failed to add PREROUTING rule."
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fi
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# 2. OUTPUT (ローカルからのDNAT)
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nft add rule inet ${TABLE_NAME} output "$PROTO" dport "$local_port" dnat to "$target_ip:$target_port" "$comment" >/dev/null
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# 3. FORWARD (転送許可)
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# ct state new,established,related accept
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nft add rule inet ${TABLE_NAME} forward ip daddr "$target_ip" "$PROTO" dport "$target_port" ct state new,established,related accept "$comment" >/dev/null
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# 戻りパケット許可 (汎用ルールとして追加してもよいが、ここではグループごとに明示的に許可)
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nft add rule inet ${TABLE_NAME} forward ip saddr "$target_ip" "$PROTO" sport "$target_port" ct state established,related accept "$comment" >/dev/null
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# 4. POSTROUTING (Masquerade - コンテナ環境のみ)
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if is_container; then
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if ! $QUIET; then
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echo -e "\e[33m[Container Detected] Enabling Masquerade for this rule.\e[0m"
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fi
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nft add rule inet ${TABLE_NAME} postrouting ip daddr "$target_ip" "$PROTO" dport "$target_port" masquerade "$comment" >/dev/null
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fi
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if ! $QUIET; then
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echo "Rule added: Local :$local_port -> $target_ip:$target_port ($PROTO)"
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fi
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}
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# ルール削除
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delete_rule() {
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init_nft
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local handle=$1
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if ! [[ "$handle" =~ ^[0-9]+$ ]]; then
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error "Invalid handle number: $handle"
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fi
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# 指定されたハンドルのルールからUUIDを取得 (PREROUTINGにあると仮定)
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local rule_info=$(nft -a list chain inet ${TABLE_NAME} prerouting | grep "handle $handle")
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local uuid=$(echo "$rule_info" | grep -o 'ipf-id:[a-z0-9-]*')
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if [[ -z "$uuid" ]]; then
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error "Rule handle $handle not found or created by external tool (missing ipf-id)."
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fi
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if ! $QUIET; then
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echo "Deleting rule group with UUID: $uuid ..."
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fi
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# そのUUIDを持つすべてのルールをテーブル全体から検索してハンドルのリストを取得
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# 注意: ルールを削除するとハンドルが変わる可能性があるため、一括取得して処理には注意が必要だが
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# nftablesではハンドルは不変。ただし、ループ削除する際は依存関係に注意。
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# JSONフォーマットで取得してパースするのが最も確実だが、依存を減らすためgrepで対応
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# テーブル全体のルールを出力し、UUIDにマッチする行のハンドルとチェーンを特定して削除
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# シンプルなアプローチ: 各チェーンを走査してUUIDにマッチするハンドルを削除
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for chain in prerouting output forward postrouting; do
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nft -a list chain inet ${TABLE_NAME} "$chain" | grep "$uuid" | grep -o 'handle [0-9]*' | awk '{print $2}' | while read -r h_del; do
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nft delete rule inet ${TABLE_NAME} "$chain" handle "$h_del"
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done
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done
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if ! $QUIET; then
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echo "Rule group deleted."
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fi
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}
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# カーネルパラメータ設定
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enable_forwarding() {
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echo "Enabling IP forwarding..."
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sysctl -w net.ipv4.ip_forward=1
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sysctl -w net.ipv4.conf.all.route_localnet=1
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sysctl -w net.ipv4.conf.default.route_localnet=1
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}
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# ---------------------------------------------------------
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# メイン処理
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# ---------------------------------------------------------
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while [[ $# -gt 0 ]]; do
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case "$1" in
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-h|--help)
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show_help
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exit 0
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;;
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-L|-l)
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list_rules
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exit 0
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;;
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-v)
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nft list ruleset
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exit 0
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;;
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-f)
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enable_forwarding
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exit 0
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;;
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--version)
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show_version
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exit 0
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;;
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-d)
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if [[ $# -lt 2 ]]; then error "Missing handle for -d"; fi
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delete_rule "$2"
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exit 0
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;;
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-q)
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QUIET=true
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shift
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;;
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-p)
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if [[ "$2" != "tcp" && "$2" != "udp" ]]; then error "Unsupported protocol"; fi
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PROTO="$2"
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shift 2
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;;
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-*)
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error "Unknown option: $1"
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;;
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*)
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break
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;;
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esac
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done
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if [[ $# -eq 0 ]]; then
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show_help
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exit 1
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fi
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arg=$1
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if [[ "$arg" =~ ^[0-9]+:[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+:[0-9]+$ ]]; then
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add_rule "$arg"
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else
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error "Invalid format. Expected: PORT:IP:PORT"
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fi
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