tcp2http/config.go at master · eWloYW8/tcp2http · GitHub

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package main

import (
	"errors"
	"flag"
	"fmt"
	"net/http"
	"strings"
	"time"
)

type headerList struct {
	items []string
}

func (h *headerList) String() string { return strings.Join(h.items, "; ") }
func (h *headerList) Set(v string) error {
	v = strings.TrimSpace(v)
	if v != "" {
		h.items = append(h.items, v)
	}
	return nil
}

func (h *headerList) Apply(dst http.Header) error {
	for _, kv := range h.items {
		parts := strings.SplitN(kv, ":", 2)
		if len(parts) != 2 {
			return fmt.Errorf("bad header %q", kv)
		}
		dst.Add(http.CanonicalHeaderKey(strings.TrimSpace(parts[0])), strings.TrimSpace(parts[1]))
	}
	return nil
}

type ClientConfig struct {
	ListenAddr               string
	UpURL, DownURL           string
	SessionHeader            string
	HeadersUp, HeadersDown   headerList
	Multipart                bool
	MultipartFN, MultipartFF string
	BufferSize               int
	HeartbeatInterval        time.Duration
	PaddingMode              string
	PaddingInterval          time.Duration
	PaddingSize              int
	HTTPTimeout              time.Duration
	LogHeartbeat             bool
	LogLevel                 logLevel
}

type ServerConfig struct {
	HTTPListenAddr    string
	UpPath, DownPath  string
	SessionHeader     string
	TargetTCP         string
	BufferSize        int
	HeartbeatInterval time.Duration
	PaddingMode       string
	PaddingInterval   time.Duration
	PaddingSize       int
	AcceptMultipart   bool
	MultipartFormName string
	WaitPeerTimeout   time.Duration
	LogLevel          logLevel
}

func parseClientFlags(args []string) (*ClientConfig, error) {
	fs := flag.NewFlagSet("client", flag.ContinueOnError)
	cfg := &ClientConfig{}
	fs.StringVar(&cfg.ListenAddr, "listen", ":6000", "")
	fs.StringVar(&cfg.UpURL, "up", "", "")
	fs.StringVar(&cfg.DownURL, "down", "", "")
	fs.StringVar(&cfg.SessionHeader, "session-header", "X-Session-ID", "")
	fs.Var(&cfg.HeadersUp, "H-up", "")
	fs.Var(&cfg.HeadersDown, "H-down", "")
	fs.BoolVar(&cfg.Multipart, "multipart", true, "")
	fs.StringVar(&cfg.MultipartFN, "multipart-form", "file", "")
	fs.StringVar(&cfg.MultipartFF, "multipart-file", "upload.bin", "")
	fs.IntVar(&cfg.BufferSize, "buf", 4096, "")
	fs.DurationVar(&cfg.HeartbeatInterval, "hb", 100*time.Millisecond, "")
	fs.StringVar(&cfg.PaddingMode, "padding-mode", PaddingNone, "none, per-packet, interval")
	fs.DurationVar(&cfg.PaddingInterval, "padding-interval", 500*time.Millisecond, "")
	fs.IntVar(&cfg.PaddingSize, "padding-size", 4096, "")
	fs.DurationVar(&cfg.HTTPTimeout, "http-timeout", 0, "")
	fs.BoolVar(&cfg.LogHeartbeat, "log-heartbeat", false, "")
	logLevelRaw := fs.String("log-level", "info", "")

	if err := fs.Parse(args); err != nil {
		return nil, err
	}
	if cfg.UpURL == "" || cfg.DownURL == "" {
		return nil, errors.New("missing urls")
	}
	level, err := parseLogLevel(*logLevelRaw)
	if err != nil {
		return nil, err
	}
	cfg.LogLevel = level
	return cfg, nil
}

func parseServerFlags(args []string) (*ServerConfig, error) {
	fs := flag.NewFlagSet("server", flag.ContinueOnError)
	cfg := &ServerConfig{}
	fs.StringVar(&cfg.HTTPListenAddr, "listen", ":18080", "")
	fs.StringVar(&cfg.UpPath, "up-path", "/up", "")
	fs.StringVar(&cfg.DownPath, "down-path", "/down", "")
	fs.StringVar(&cfg.SessionHeader, "session-header", "X-Session-ID", "")
	fs.StringVar(&cfg.TargetTCP, "target", "127.0.0.1:22", "")
	fs.IntVar(&cfg.BufferSize, "buf", 4096, "")
	fs.DurationVar(&cfg.HeartbeatInterval, "hb", 100*time.Millisecond, "")
	fs.StringVar(&cfg.PaddingMode, "padding-mode", PaddingNone, "none, per-packet, interval")
	fs.DurationVar(&cfg.PaddingInterval, "padding-interval", 500*time.Millisecond, "")
	fs.IntVar(&cfg.PaddingSize, "padding-size", 4096, "")
	fs.BoolVar(&cfg.AcceptMultipart, "accept-multipart", true, "")
	fs.StringVar(&cfg.MultipartFormName, "multipart-form", "file", "")
	fs.DurationVar(&cfg.WaitPeerTimeout, "wait-peer-timeout", 30*time.Second, "")
	logLevelRaw := fs.String("log-level", "info", "")

	if err := fs.Parse(args); err != nil {
		return nil, err
	}
	level, err := parseLogLevel(*logLevelRaw)
	if err != nil {
		return nil, err
	}
	cfg.LogLevel = level
	return cfg, nil
}