mirror of
https://github.com/tailscale/tailscale.git
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133 lines
2.4 KiB
Go
133 lines
2.4 KiB
Go
// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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//go:build linux
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// +build linux
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package tshttpproxy
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import (
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"bytes"
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"fmt"
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"io"
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"net"
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"net/http"
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"net/url"
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"os"
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"strings"
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"sync"
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"time"
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"tailscale.com/util/lineread"
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)
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// These vars are overridden for tests.
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var (
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synologyProxyConfigPath = "/etc/proxy.conf"
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openSynologyProxyConf = func() (io.ReadCloser, error) {
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return os.Open(synologyProxyConfigPath)
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}
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)
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var cache struct {
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sync.Mutex
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proxy *url.URL
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updated time.Time
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}
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func synologyProxyFromConfigCached(req *http.Request) (*url.URL, error) {
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if req.URL == nil {
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return nil, nil
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}
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cache.Lock()
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defer cache.Unlock()
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modtime := mtime(synologyProxyConfigPath)
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if cache.updated == modtime {
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return cache.proxy, nil
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}
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val, err := synologyProxyFromConfig(req)
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cache.proxy = val
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cache.updated = modtime
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return val, err
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}
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func synologyProxyFromConfig(req *http.Request) (*url.URL, error) {
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r, err := openSynologyProxyConf()
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if err != nil {
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if os.IsNotExist(err) {
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return nil, nil
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}
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return nil, err
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}
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defer r.Close()
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return parseSynologyConfig(r)
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}
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func parseSynologyConfig(r io.Reader) (*url.URL, error) {
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cfg := map[string]string{}
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if err := lineread.Reader(r, func(line []byte) error {
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// accept and skip over empty lines
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line = bytes.TrimSpace(line)
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if len(line) == 0 {
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return nil
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}
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key, value, ok := strings.Cut(string(line), "=")
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if !ok {
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return fmt.Errorf("missing \"=\" in proxy.conf line: %q", line)
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}
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cfg[string(key)] = string(value)
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return nil
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}); err != nil {
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return nil, err
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}
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if cfg["proxy_enabled"] != "yes" {
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return nil, nil
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}
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proxyURL := new(url.URL)
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if cfg["auth_enabled"] == "yes" {
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proxyURL.User = url.UserPassword(cfg["proxy_user"], cfg["proxy_pwd"])
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}
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proxyURL.Scheme = "https"
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host, port := cfg["https_host"], cfg["https_port"]
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if host == "" {
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proxyURL.Scheme = "http"
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host, port = cfg["http_host"], cfg["http_port"]
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}
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if host == "" {
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return nil, nil
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}
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if port != "" {
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proxyURL.Host = net.JoinHostPort(host, port)
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} else {
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proxyURL.Host = host
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}
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return proxyURL, nil
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}
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// mtime stat's path and returns its modification time. If path does not exist,
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// it returns the unix epoch.
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func mtime(path string) time.Time {
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fi, err := os.Stat(path)
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if err != nil {
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return time.Unix(0, 0)
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}
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return fi.ModTime()
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}
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