170 lines
6.0 KiB
Bash
170 lines
6.0 KiB
Bash
#!/bin/bash
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# 查找随机空闲端口
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# 用途：
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# 在指定端口范围内，随机选择一个当前未被监听（TCP/UDP）的端口
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# 参数：
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# $1: 起始端口（默认 10001）
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# $2: 结束端口（默认 65535）
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# $3: 最大随机尝试次数（默认 100）
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find_free_port() {
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local start="${1:-10001}"
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local max="${2:-65535}"
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local attempts="${3:-100}"
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# ------------------------------------------------------------
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# 收集当前正在监听的端口（TCP + UDP）
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# 优先使用 ss，其次 netstat
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# ------------------------------------------------------------
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local used_ports raw
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if command -v ss >/dev/null 2>&1; then
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# ss 输出示例：
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# LISTEN 0 128 0.0.0.0:22
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raw=$(ss -lntu 2>/dev/null || true)
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used_ports=$(printf "%s\n" "$raw" \
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| awk '{print $5}' \
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| sed -E 's/.*[:]//g')
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elif command -v netstat >/dev/null 2>&1; then
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# netstat 输出示例：
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# tcp 0 0 0.0.0.0:22
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raw=$(netstat -lntu 2>/dev/null || true)
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used_ports=$(printf "%s\n" "$raw" \
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| awk '{print $4}' \
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| sed -E 's/.*[:]//g')
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else
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echo "Error: ss or netstat is required to check listening ports." >&2
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return 2
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fi
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# ------------------------------------------------------------
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# 将已占用端口存入关联数组，便于 O(1) 判断
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# 需要 bash 4+
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# ------------------------------------------------------------
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declare -A used_map
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local p
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for p in $used_ports; do
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# 过滤非数字字段（如 *、:::）
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if [[ $p =~ ^[0-9]+$ ]]; then
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used_map["$p"]=1
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fi
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done
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# ------------------------------------------------------------
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# 随机尝试若干次
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# 每次随机生成一个端口，只要未被监听就立即返回
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# ------------------------------------------------------------
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local port i
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for ((i=0; i<attempts; i++)); do
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# 在 [start, max] 范围内生成随机端口
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port=$(( RANDOM % (max - start + 1) + start ))
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# 如果端口不在已监听表中，则认为可用
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if [[ -z "${used_map[$port]}" ]]; then
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echo "$port"
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return 0
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fi
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done
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# ------------------------------------------------------------
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# 多次随机尝试后仍未找到可用端口
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# 通常意味着端口范围过小或已被大量占用
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# ------------------------------------------------------------
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echo "Error: no free port found after $attempts random attempts." >&2
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return 1
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}
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# ==========================================
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# 函数名: manage_port
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# 功能: 开放端口和关闭端口
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# 参数1: allow 或 deny (操作类型)
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# 参数2: 端口号
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# --- 使用示例 ---
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# 开启端口 8888
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# manage_port allow 8888
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# 关闭端口 8888
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# manage_port deny 8888
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# ==========================================
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manage_port() {
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local ACTION=$1
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local PORT=$2
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if [[ -z "$PORT" ]]; then
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echo "错误: 未提供端口号"
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return 1
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fi
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# 统一转换为小写，增强鲁棒性
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ACTION=$(echo "$ACTION" | tr '[:upper:]' '[:lower:]')
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echo "--- 正在对端口 $PORT 执行 $ACTION 操作 ---"
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# 1. 防火墙 (Firewall) 逻辑处理
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if command -v firewall-cmd >/dev/null 2>&1 && systemctl is-active --quiet firewalld; then
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# CentOS/RHEL/Fedora (firewalld)
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if [ "$ACTION" == "allow" ]; then
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sudo firewall-cmd --zone=public --add-port=${PORT}/tcp --permanent
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sudo firewall-cmd --zone=public --add-port=${PORT}/udp --permanent
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elif [ "$ACTION" == "deny" ]; then
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sudo firewall-cmd --zone=public --remove-port=${PORT}/tcp --permanent
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sudo firewall-cmd --zone=public --remove-port=${PORT}/udp --permanent
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fi
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sudo firewall-cmd --reload
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echo "[OK] firewalld 规则已更新 ($ACTION)"
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elif command -v ufw >/dev/null 2>&1 && systemctl is-active --quiet ufw; then
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# Ubuntu/Debian (ufw)
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if [ "$ACTION" == "allow" ]; then
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sudo ufw allow ${PORT}/tcp
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sudo ufw allow ${PORT}/udp
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elif [ "$ACTION" == "deny" ]; then
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sudo ufw delete allow ${PORT}/tcp
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sudo ufw delete allow ${PORT}/udp
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fi
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echo "[OK] ufw 规则已更新 ($ACTION)"
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else
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# 兜底方案 (iptables)
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# allow 使用 -I (Insert) 插入到规则首行，deny 使用 -D (Delete)
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local FLAG=$([ "$ACTION" == "allow" ] && echo "-I" || echo "-D")
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sudo iptables $FLAG INPUT -p tcp --dport ${PORT} -j ACCEPT 2>/dev/null
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sudo iptables $FLAG INPUT -p udp --dport ${PORT} -j ACCEPT 2>/dev/null
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echo "[OK] iptables 规则已执行 ($ACTION)"
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fi
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# 2. SELinux 逻辑处理
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if command -v getenforce >/dev/null 2>&1; then
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local SELINUX_STATUS=$(getenforce)
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if [ "$SELINUX_STATUS" == "Enforcing" ]; then
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if command -v semanage >/dev/null 2>&1; then
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if [ "$ACTION" == "allow" ]; then
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# 尝试添加，若存在则尝试修改
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sudo semanage port -a -t http_port_t -p tcp ${PORT} 2>/dev/null || \
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sudo semanage port -m -t http_port_t -p tcp ${PORT}
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elif [ "$ACTION" == "deny" ]; then
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sudo semanage port -d -t http_port_t -p tcp ${PORT} 2>/dev/null
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fi
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echo "[OK] SELinux 端口权限已更新 ($ACTION)"
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else
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# 如果没装 semanage，在 allow 时开启全局布尔值，deny 时通常保持不变以防影响其他业务
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if [ "$ACTION" == "allow" ]; then
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echo "[!] 警告: 未找到 semanage，尝试开启全局网络连接开关..."
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sudo setsebool -P httpd_can_network_connect 1
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fi
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fi
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fi
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fi
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}
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update_port(){
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local script_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)" # 脚本文件夹绝对路径
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local config_dir="$script_dir/../config"
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local port=$(find_free_port)
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modify_json_file "$config_dir/config.json" ".inbounds[0].listen_port" "$port"
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manage_port allow "$port"
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echo "设置端口成功"
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}
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