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portforward.go
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portforward.go
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package settings
import (
"fmt"
"path/filepath"
"github.com/qdm12/gluetun/internal/constants/providers"
"github.com/qdm12/gosettings"
"github.com/qdm12/gosettings/reader"
"github.com/qdm12/gosettings/validate"
"github.com/qdm12/gotree"
)
// PortForwarding contains settings for port forwarding.
type PortForwarding struct {
// Enabled is true if port forwarding should be activated.
// It cannot be nil for the internal state.
Enabled *bool `json:"enabled"`
// Provider is set to specify which custom port forwarding code
// should be used. This is especially necessary for the custom
// provider using Wireguard for a provider where Wireguard is not
// natively supported but custom port forwarding code is available.
// It defaults to the empty string, meaning the current provider
// should be the one used for port forwarding.
// It cannot be nil for the internal state.
Provider *string `json:"provider"`
// Filepath is the port forwarding status file path
// to use. It can be the empty string to indicate not
// to write to a file. It cannot be nil for the
// internal state
Filepath *string `json:"status_file_path"`
// ListeningPort is the port traffic would be redirected to from the
// forwarded port. The redirection is disabled if it is set to 0, which
// is its default as well.
ListeningPort *uint16 `json:"listening_port"`
}
func (p PortForwarding) Validate(vpnProvider string) (err error) {
if !*p.Enabled {
return nil
}
// Validate current provider or custom provider specified
providerSelected := vpnProvider
if *p.Provider != "" {
providerSelected = *p.Provider
}
validProviders := []string{
providers.PrivateInternetAccess,
providers.Protonvpn,
}
if err = validate.IsOneOf(providerSelected, validProviders...); err != nil {
return fmt.Errorf("%w: %w", ErrPortForwardingEnabled, err)
}
// Validate Filepath
if *p.Filepath != "" { // optional
_, err := filepath.Abs(*p.Filepath)
if err != nil {
return fmt.Errorf("filepath is not valid: %w", err)
}
}
return nil
}
func (p *PortForwarding) Copy() (copied PortForwarding) {
return PortForwarding{
Enabled: gosettings.CopyPointer(p.Enabled),
Provider: gosettings.CopyPointer(p.Provider),
Filepath: gosettings.CopyPointer(p.Filepath),
ListeningPort: gosettings.CopyPointer(p.ListeningPort),
}
}
func (p *PortForwarding) OverrideWith(other PortForwarding) {
p.Enabled = gosettings.OverrideWithPointer(p.Enabled, other.Enabled)
p.Provider = gosettings.OverrideWithPointer(p.Provider, other.Provider)
p.Filepath = gosettings.OverrideWithPointer(p.Filepath, other.Filepath)
p.ListeningPort = gosettings.OverrideWithPointer(p.ListeningPort, other.ListeningPort)
}
func (p *PortForwarding) setDefaults() {
p.Enabled = gosettings.DefaultPointer(p.Enabled, false)
p.Provider = gosettings.DefaultPointer(p.Provider, "")
p.Filepath = gosettings.DefaultPointer(p.Filepath, "/tmp/gluetun/forwarded_port")
p.ListeningPort = gosettings.DefaultPointer(p.ListeningPort, 0)
}
func (p PortForwarding) String() string {
return p.toLinesNode().String()
}
func (p PortForwarding) toLinesNode() (node *gotree.Node) {
if !*p.Enabled {
return nil
}
node = gotree.New("Automatic port forwarding settings:")
listeningPort := "disabled"
if *p.ListeningPort != 0 {
listeningPort = fmt.Sprintf("%d", *p.ListeningPort)
}
node.Appendf("Redirection listening port: %s", listeningPort)
if *p.Provider == "" {
node.Appendf("Use port forwarding code for current provider")
} else {
node.Appendf("Use code for provider: %s", *p.Provider)
}
filepath := *p.Filepath
if filepath == "" {
filepath = "[not set]"
}
node.Appendf("Forwarded port file path: %s", filepath)
return node
}
func (p *PortForwarding) read(r *reader.Reader) (err error) {
p.Enabled, err = r.BoolPtr("VPN_PORT_FORWARDING",
reader.RetroKeys(
"PORT_FORWARDING",
"PRIVATE_INTERNET_ACCESS_VPN_PORT_FORWARDING",
))
if err != nil {
return err
}
p.Provider = r.Get("VPN_PORT_FORWARDING_PROVIDER")
p.Filepath = r.Get("VPN_PORT_FORWARDING_STATUS_FILE",
reader.ForceLowercase(false),
reader.RetroKeys(
"PORT_FORWARDING_STATUS_FILE",
"PRIVATE_INTERNET_ACCESS_VPN_PORT_FORWARDING_STATUS_FILE",
))
p.ListeningPort, err = r.Uint16Ptr("VPN_PORT_FORWARDING_LISTENING_PORT")
if err != nil {
return err
}
return nil
}