89 lines
2.7 KiB
Bash
89 lines
2.7 KiB
Bash
#!/bin/bash
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source "$(dirname "$0")/utils/jq_util.sh"
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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 $attempts random attempts." >&2
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return 1
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}
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update_port(){
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local script_dir="$(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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echo "设置端口成功"
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}
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update_port
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