85 lines
2.7 KiB
Bash
85 lines
2.7 KiB
Bash
#!/bin/bash
|
||
|
||
# 查找随机空闲端口
|
||
# 用途：
|
||
# 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
|
||
# 参数：
|
||
# $1: 起始端口（默认 10001）
|
||
# $2: 结束端口（默认 65535）
|
||
# $3: 最大随机尝试次数（默认 100）
|
||
find_free_port() {
|
||
local start="${1:-10001}"
|
||
local max="${2:-65535}"
|
||
local attempts="${3:-100}"
|
||
|
||
# ------------------------------------------------------------
|
||
# 收集当前正在监听的端口（TCP + UDP）
|
||
# 优先使用 ss，其次 netstat
|
||
# ------------------------------------------------------------
|
||
local used_ports raw
|
||
if command -v ss >/dev/null 2>&1; then
|
||
# ss 输出示例：
|
||
# LISTEN 0 128 0.0.0.0:22
|
||
raw=$(ss -lntu 2>/dev/null || true)
|
||
used_ports=$(printf "%s\n" "$raw" \
|
||
| awk '{print $5}' \
|
||
| sed -E 's/.*[:]//g')
|
||
elif command -v netstat >/dev/null 2>&1; then
|
||
# netstat 输出示例：
|
||
# tcp 0 0 0.0.0.0:22
|
||
raw=$(netstat -lntu 2>/dev/null || true)
|
||
used_ports=$(printf "%s\n" "$raw" \
|
||
| awk '{print $4}' \
|
||
| sed -E 's/.*[:]//g')
|
||
else
|
||
echo "Error: ss or netstat is required to check listening ports." >&2
|
||
return 2
|
||
fi
|
||
|
||
# ------------------------------------------------------------
|
||
# 将已占用端口存入关联数组，便于 O(1) 判断
|
||
# 需要 bash 4+
|
||
# ------------------------------------------------------------
|
||
declare -A used_map
|
||
local p
|
||
for p in $used_ports; do
|
||
# 过滤非数字字段（如 *、:::）
|
||
if [[ $p =~ ^[0-9]+$ ]]; then
|
||
used_map["$p"]=1
|
||
fi
|
||
done
|
||
|
||
# ------------------------------------------------------------
|
||
# 随机尝试若干次
|
||
# 每次随机生成一个端口，只要未被监听就立即返回
|
||
# ------------------------------------------------------------
|
||
local port i
|
||
for ((i=0; i<attempts; i++)); do
|
||
# 在 [start, max] 范围内生成随机端口
|
||
port=$(( RANDOM % (max - start + 1) + start ))
|
||
|
||
# 如果端口不在已监听表中，则认为可用
|
||
if [[ -z "${used_map[$port]}" ]]; then
|
||
echo "$port"
|
||
return 0
|
||
fi
|
||
done
|
||
|
||
# ------------------------------------------------------------
|
||
# 多次随机尝试后仍未找到可用端口
|
||
# 通常意味着端口范围过小或已被大量占用
|
||
# ------------------------------------------------------------
|
||
echo "Error: no free port found after $attempts random attempts." >&2
|
||
return 1
|
||
}
|
||
|
||
|
||
update_port(){
|
||
local script_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)" # 脚本文件夹路径
|
||
local config_file="$script_dir/../conf/config.json"
|
||
|
||
local port=$(find_free_port)
|
||
modify_json_file "$config_file" ".inbounds[0].port" "$port"
|
||
echo "设置端口成功"
|
||
}
|