#!/bin/bash
# Name: ipfn
# Version: 1.0.9
# Date: 2026-01-22
# Description: Supports range deletion (e.g., -d 80-85) and complex handle lists.

if [ "$(id -u)" -ne 0 ]; then
    exec sudo "$0" "$@"
fi

TABLE_NAME="ipf_wrapper"
PROTO="tcp"
FORCE_FLAG=false
SKIP_TEST=false

init_nft() {
    nft add table inet ${TABLE_NAME} 2>/dev/null
    nft add chain inet ${TABLE_NAME} prerouting { type nat hook prerouting priority -100 \; } 2>/dev/null
    nft add chain inet ${TABLE_NAME} output { type nat hook output priority -100 \; } 2>/dev/null
    nft add chain inet ${TABLE_NAME} postrouting { type nat hook postrouting priority 100 \; } 2>/dev/null
    nft add chain inet ${TABLE_NAME} forward { type filter hook forward priority 0 \; policy accept \; } 2>/dev/null
}

list_rules() {
    local highlight_uuid=$1
    init_nft
    echo "Forwarding Rules (ipfn):"
    printf "%-10s %-6s %-20s %-20s %-10s\n" "HANDLE" "PROTO" "LOCAL" "TARGET" "UUID"
    echo "-----------------------------------------------------------------------------------"
    nft -a list chain inet ${TABLE_NAME} prerouting | grep "dnat" | while read -r line; do
        handle=$(echo "$line" | grep -o 'handle [0-9]*' | awk '{print $2}')
        proto=$(echo "$line" | grep -q "udp" && echo "udp" || echo "tcp")
        target=$(echo "$line" | grep -oE '[0-9.]*:[0-9]+' | head -n 1)
        lport=$(echo "$line" | grep -o 'dport [0-9]*' | awk '{print $2}')
        full_uuid=$(echo "$line" | grep -o 'ipf-id:[a-z0-9-]*' | cut -d':' -f2)
        if [[ -n "$highlight_uuid" && "$full_uuid" == "$highlight_uuid" ]]; then
            printf "\e[1;36m*%-9s %-6s %-20s %-20s %-10s\e[0m\n" "$handle" "$proto" ":$lport" "$target" "${full_uuid:0:8}"
        else
            printf "%-10s %-6s %-20s %-20s %-10s\n" "$handle" "$proto" ":$lport" "$target" "${full_uuid:0:8}"
        fi
    done
}

perform_delete() {
    local handle=$1
    local rule_info=$(nft -a list chain inet ${TABLE_NAME} prerouting | grep "handle $handle")
    [[ -z "$rule_info" ]] && return # 存在しないハンドルは静かにスルー
    local uuid=$(echo "$rule_info" | grep -o 'ipf-id:[a-z0-9-]*' | head -n 1)
    for chain in prerouting output forward postrouting; do
        nft -a list chain inet ${TABLE_NAME} "$chain" | grep "$uuid" | grep -o 'handle [0-9]*' | awk '{print $2}' | while read -r h; do
            nft delete rule inet ${TABLE_NAME} "$chain" handle "$h"
        done
    done
    echo "ipfn: Handle $handle deleted."
}

# --- メインパース部分の強化 ---
parse_handles() {
    local input=$1
    local -a result=()
    # カンマで分割
    IFS=',' read -r -a parts <<< "$input"
    for part in "${parts[@]}"; do
        if [[ "$part" =~ ^([0-9]+)-([0-9]+)$ ]]; then
            # 範囲指定 (start-end) の処理
            start=${BASH_REMATCH[1]}
            end=${BASH_REMATCH[2]}
            for ((i=start; i<=end; i++)); do result+=("$i"); done
        else
            # 単一指定
            result+=("$part")
        fi
    done
    echo "${result[@]}"
}

# (add_rule, test_rule_by_port は前バージョンと同じ)
test_rule_by_port() {
    local lp=$1
    echo -n "Testing connectivity to :$lp... "
    if nc -z -v -w 2 127.0.0.1 "$lp" 2>&1 | grep -E "succeeded|connected|open" >/dev/null; then
        echo -e "\e[32mOK\e[0m"
    else
        echo -e "\e[31mFAILED\e[0m"
    fi
}

add_rule() {
    init_nft
    local port_ip_port=$1
    local lp=$(echo "$port_ip_port" | cut -d':' -f1)
    local tip=$(echo "$port_ip_port" | cut -d':' -f2)
    local tp=$(echo "$port_ip_port" | cut -d':' -f3)
    [[ -n "$lp" ]] && nft list chain inet ${TABLE_NAME} prerouting | grep -q "dport $lp" && echo -e "\e[33mWarning: Port :$lp is already in use.\e[0m"
    local raw_uuid=$(cat /proc/sys/kernel/random/uuid)
    local uuid="ipf-id:$raw_uuid"
    local comment="comment \"$uuid\""
    local family="ip"; [[ "$tip" =~ : ]] && family="ip6"
    nft add rule inet ${TABLE_NAME} prerouting "$PROTO" dport "$lp" dnat $family to "$tip:$tp" "$comment"
    nft add rule inet ${TABLE_NAME} output "$PROTO" dport "$lp" dnat $family to "$tip:$tp" "$comment"
    nft add rule inet ${TABLE_NAME} forward iifname "lo" accept "$comment"
    nft add rule inet ${TABLE_NAME} forward $family daddr "$tip" "$PROTO" dport "$tp" ct state new,established,related accept "$comment"
    nft add rule inet ${TABLE_NAME} forward $family saddr "$tip" "$PROTO" sport "$tp" ct state established,related accept "$comment"
    nft add rule inet ${TABLE_NAME} postrouting $family daddr "$tip" "$PROTO" dport "$tp" masquerade "$comment"
    echo "ipfn: Rule added."; echo ""; list_rules "$raw_uuid"
    [[ "$SKIP_TEST" == false ]] && { echo ""; test_rule_by_port "$lp"; }
}

for arg in "$@"; do [[ "$arg" == "-f" ]] && FORCE_FLAG=true && SKIP_TEST=true; done
if [[ $# -eq 0 ]]; then list_rules; exit 0; fi

while [[ $# -gt 0 ]]; do
    case "$1" in
        -L|-l) list_rules; exit 0 ;;
        -df*|-d*)
            [[ "$1" == -df* ]] && FORCE_FLAG=true
            raw_h="${1#-df}"; raw_h="${raw_h#-d}"
            [[ -z "$raw_h" ]] && { raw_h="$2"; shift; }
            
            # 範囲指定を含むハンドルリストを解析
            handles=($(parse_handles "$raw_h"))
            
            if [[ "$FORCE_FLAG" == false ]]; then
                echo "Review handles to delete:"
                for h in "${handles[@]}"; do
                    rule=$(nft -a list chain inet ${TABLE_NAME} prerouting | grep "handle $h")
                    [[ -n "$rule" ]] && echo "  $rule"
                done
                echo -n "Delete these rules? (y/N): "
                read -r confirm
                [[ ! "$confirm" =~ ^[yY]$ ]] && { echo "Aborted."; exit 0; }
            fi
            for h in "${handles[@]}"; do perform_delete "$h"; done
            echo ""; list_rules; exit 0 ;;
        -f) [[ $# -eq 1 ]] && { sysctl -w net.ipv4.ip_forward=1 >/dev/null; sysctl -w net.ipv4.conf.all.route_localnet=1 >/dev/null; echo "Kernel parameters updated."; exit 0; } ;;
        *) [[ "$1" =~ ^[0-9]+: ]] && { add_rule "$1"; exit 0; } ;;
    esac
    shift
done