frp/pkg/config/visitor.go

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// Copyright 2018 fatedier, fatedier@gmail.com
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package config
import (
"fmt"
"reflect"
"github.com/samber/lo"
"gopkg.in/ini.v1"
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"github.com/fatedier/frp/pkg/consts"
)
// Visitor
var (
visitorConfTypeMap = map[string]reflect.Type{
consts.STCPProxy: reflect.TypeOf(STCPVisitorConf{}),
consts.XTCPProxy: reflect.TypeOf(XTCPVisitorConf{}),
consts.SUDPProxy: reflect.TypeOf(SUDPVisitorConf{}),
}
)
type VisitorConf interface {
GetBaseInfo() *BaseVisitorConf
Compare(cmp VisitorConf) bool
UnmarshalFromIni(prefix string, name string, section *ini.Section) error
Check() error
}
type BaseVisitorConf struct {
ProxyName string `ini:"name" json:"name"`
ProxyType string `ini:"type" json:"type"`
UseEncryption bool `ini:"use_encryption" json:"use_encryption"`
UseCompression bool `ini:"use_compression" json:"use_compression"`
Role string `ini:"role" json:"role"`
Sk string `ini:"sk" json:"sk"`
ServerName string `ini:"server_name" json:"server_name"`
BindAddr string `ini:"bind_addr" json:"bind_addr"`
BindPort int `ini:"bind_port" json:"bind_port"`
}
type SUDPVisitorConf struct {
BaseVisitorConf `ini:",extends"`
}
type STCPVisitorConf struct {
BaseVisitorConf `ini:",extends"`
}
type XTCPVisitorConf struct {
BaseVisitorConf `ini:",extends"`
Protocol string `ini:"protocol" json:"protocol,omitempty"`
KeepTunnelOpen bool `ini:"keep_tunnel_open" json:"keep_tunnel_open,omitempty"`
MaxRetriesAnHour int `ini:"max_retries_an_hour" json:"max_retries_an_hour,omitempty"`
MinRetryInterval int `ini:"min_retry_interval" json:"min_retry_interval,omitempty"`
}
// DefaultVisitorConf creates a empty VisitorConf object by visitorType.
// If visitorType doesn't exist, return nil.
func DefaultVisitorConf(visitorType string) VisitorConf {
v, ok := visitorConfTypeMap[visitorType]
if !ok {
return nil
}
return reflect.New(v).Interface().(VisitorConf)
}
// Visitor loaded from ini
func NewVisitorConfFromIni(prefix string, name string, section *ini.Section) (VisitorConf, error) {
// section.Key: if key not exists, section will set it with default value.
visitorType := section.Key("type").String()
if visitorType == "" {
return nil, fmt.Errorf("visitor [%s] type shouldn't be empty", name)
}
conf := DefaultVisitorConf(visitorType)
if conf == nil {
return nil, fmt.Errorf("visitor [%s] type [%s] error", name, visitorType)
}
if err := conf.UnmarshalFromIni(prefix, name, section); err != nil {
return nil, fmt.Errorf("visitor [%s] type [%s] error", name, visitorType)
}
if err := conf.Check(); err != nil {
return nil, err
}
return conf, nil
}
// Base
func (cfg *BaseVisitorConf) GetBaseInfo() *BaseVisitorConf {
return cfg
}
func (cfg *BaseVisitorConf) compare(cmp *BaseVisitorConf) bool {
if cfg.ProxyName != cmp.ProxyName ||
cfg.ProxyType != cmp.ProxyType ||
cfg.UseEncryption != cmp.UseEncryption ||
cfg.UseCompression != cmp.UseCompression ||
cfg.Role != cmp.Role ||
cfg.Sk != cmp.Sk ||
cfg.ServerName != cmp.ServerName ||
cfg.BindAddr != cmp.BindAddr ||
cfg.BindPort != cmp.BindPort {
return false
}
return true
}
func (cfg *BaseVisitorConf) check() (err error) {
if cfg.Role != "visitor" {
err = fmt.Errorf("invalid role")
return
}
if cfg.BindAddr == "" {
err = fmt.Errorf("bind_addr shouldn't be empty")
return
}
if cfg.BindPort <= 0 {
err = fmt.Errorf("bind_port is required")
return
}
return
}
func (cfg *BaseVisitorConf) unmarshalFromIni(prefix string, name string, section *ini.Section) error {
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_ = section
// Custom decoration after basic unmarshal:
// proxy name
cfg.ProxyName = prefix + name
// server_name
cfg.ServerName = prefix + cfg.ServerName
// bind_addr
if cfg.BindAddr == "" {
cfg.BindAddr = "127.0.0.1"
}
return nil
}
func preVisitorUnmarshalFromIni(cfg VisitorConf, prefix string, name string, section *ini.Section) error {
err := section.MapTo(cfg)
if err != nil {
return err
}
err = cfg.GetBaseInfo().unmarshalFromIni(prefix, name, section)
if err != nil {
return err
}
return nil
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}
// SUDP
var _ VisitorConf = &SUDPVisitorConf{}
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func (cfg *SUDPVisitorConf) Compare(cmp VisitorConf) bool {
cmpConf, ok := cmp.(*SUDPVisitorConf)
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if !ok {
return false
}
if !cfg.BaseVisitorConf.compare(&cmpConf.BaseVisitorConf) {
return false
}
// Add custom login equal, if exists
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return true
}
func (cfg *SUDPVisitorConf) UnmarshalFromIni(prefix string, name string, section *ini.Section) (err error) {
err = preVisitorUnmarshalFromIni(cfg, prefix, name, section)
if err != nil {
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return
}
// Add custom logic unmarshal, if exists
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return
}
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func (cfg *SUDPVisitorConf) Check() (err error) {
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if err = cfg.BaseVisitorConf.check(); err != nil {
return
}
// Add custom logic validate, if exists
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return
}
// STCP
var _ VisitorConf = &STCPVisitorConf{}
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func (cfg *STCPVisitorConf) Compare(cmp VisitorConf) bool {
cmpConf, ok := cmp.(*STCPVisitorConf)
if !ok {
return false
}
if !cfg.BaseVisitorConf.compare(&cmpConf.BaseVisitorConf) {
return false
}
// Add custom login equal, if exists
return true
}
func (cfg *STCPVisitorConf) UnmarshalFromIni(prefix string, name string, section *ini.Section) (err error) {
err = preVisitorUnmarshalFromIni(cfg, prefix, name, section)
if err != nil {
return
}
// Add custom logic unmarshal, if exists
return
}
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func (cfg *STCPVisitorConf) Check() (err error) {
if err = cfg.BaseVisitorConf.check(); err != nil {
return
}
// Add custom logic validate, if exists
return
}
// XTCP
var _ VisitorConf = &XTCPVisitorConf{}
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func (cfg *XTCPVisitorConf) Compare(cmp VisitorConf) bool {
cmpConf, ok := cmp.(*XTCPVisitorConf)
if !ok {
return false
}
if !cfg.BaseVisitorConf.compare(&cmpConf.BaseVisitorConf) {
return false
}
// Add custom login equal, if exists
if cfg.Protocol != cmpConf.Protocol ||
cfg.KeepTunnelOpen != cmpConf.KeepTunnelOpen ||
cfg.MaxRetriesAnHour != cmpConf.MaxRetriesAnHour ||
cfg.MinRetryInterval != cmpConf.MinRetryInterval {
return false
}
return true
}
func (cfg *XTCPVisitorConf) UnmarshalFromIni(prefix string, name string, section *ini.Section) (err error) {
err = preVisitorUnmarshalFromIni(cfg, prefix, name, section)
if err != nil {
return
}
// Add custom logic unmarshal, if exists
if cfg.Protocol == "" {
cfg.Protocol = "quic"
}
if cfg.MaxRetriesAnHour <= 0 {
cfg.MaxRetriesAnHour = 8
}
if cfg.MinRetryInterval <= 0 {
cfg.MinRetryInterval = 90
}
return
}
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func (cfg *XTCPVisitorConf) Check() (err error) {
if err = cfg.BaseVisitorConf.check(); err != nil {
return
}
// Add custom logic validate, if exists
if !lo.Contains([]string{"", "kcp", "quic"}, cfg.Protocol) {
return fmt.Errorf("protocol should be 'kcp' or 'quic'")
}
return
}