Feature: FastestVPN support (#383)

internal/provider/fastestvpn.go

@@ -0,0 +1,170 @@
+package provider
+
+import (
+	"context"
+	"fmt"
+	"math/rand"
+	"net"
+	"net/http"
+	"strconv"
+
+	"github.com/qdm12/gluetun/internal/configuration"
+	"github.com/qdm12/gluetun/internal/constants"
+	"github.com/qdm12/gluetun/internal/firewall"
+	"github.com/qdm12/gluetun/internal/models"
+	"github.com/qdm12/golibs/logging"
+	"github.com/qdm12/golibs/os"
+)
+
+type fastestvpn struct {
+	servers    []models.FastestvpnServer
+	randSource rand.Source
+}
+
+func newFastestvpn(servers []models.FastestvpnServer, timeNow timeNowFunc) *fastestvpn {
+	return &fastestvpn{
+		servers:    servers,
+		randSource: rand.NewSource(timeNow().UnixNano()),
+	}
+}
+
+func (f *fastestvpn) filterServers(countries, hostnames []string, protocol string) (servers []models.FastestvpnServer) {
+	var tcp, udp bool
+	if protocol == "tcp" {
+		tcp = true
+	} else {
+		udp = true
+	}
+
+	for _, server := range f.servers {
+		switch {
+		case filterByPossibilities(server.Country, countries):
+		case filterByPossibilities(server.Hostname, hostnames):
+		case tcp && !server.TCP:
+		case udp && !server.UDP:
+		default:
+			servers = append(servers, server)
+		}
+	}
+	return servers
+}
+
+func (f *fastestvpn) notFoundErr(selection configuration.ServerSelection) error {
+	message := "no server found for protocol " + selection.Protocol
+
+	if len(selection.Hostnames) > 0 {
+		message += " + hostnames " + commaJoin(selection.Hostnames)
+	}
+
+	if len(selection.Countries) > 0 {
+		message += " + countries " + commaJoin(selection.Countries)
+	}
+
+	return fmt.Errorf(message)
+}
+
+func (f *fastestvpn) GetOpenVPNConnection(selection configuration.ServerSelection) (
+	connection models.OpenVPNConnection, err error) {
+	var port uint16 = 4443
+
+	if selection.TargetIP != nil {
+		return models.OpenVPNConnection{IP: selection.TargetIP, Port: port, Protocol: selection.Protocol}, nil
+	}
+
+	servers := f.filterServers(selection.Countries, selection.Hostnames, selection.Protocol)
+	if len(servers) == 0 {
+		return connection, f.notFoundErr(selection)
+	}
+
+	var connections []models.OpenVPNConnection
+	for _, server := range servers {
+		for _, IP := range server.IPs {
+			connection := models.OpenVPNConnection{
+				IP:       IP,
+				Port:     port,
+				Protocol: selection.Protocol,
+			}
+			connections = append(connections, connection)
+		}
+	}
+
+	return pickRandomConnection(connections, f.randSource), nil
+}
+
+func (f *fastestvpn) BuildConf(connection models.OpenVPNConnection,
+	username string, settings configuration.OpenVPN) (lines []string) {
+	if len(settings.Cipher) == 0 {
+		settings.Cipher = aes256cbc
+	}
+	if len(settings.Auth) == 0 {
+		settings.Auth = sha256
+	}
+	if settings.MSSFix == 0 {
+		settings.MSSFix = 1450
+	}
+
+	lines = []string{
+		"client",
+		"dev tun",
+		"nobind",
+		"persist-key",
+		"ping 15",
+		"ping-exit 60",
+		"ping-timer-rem",
+		"tls-exit",
+
+		// Fastestvpn specific
+		"ping-restart 0",
+		"tls-client",
+		"tls-cipher  TLS-DHE-RSA-WITH-AES-256-GCM-SHA384:TLS-DHE-RSA-WITH-AES-256-CBC-SHA256:TLS-DHE-RSA-WITH-CAMELLIA-256-CBC-SHA:TLS-DHE-RSA-WITH-AES-256-CBC-SHA:TLS-RSA-WITH-CAMELLIA-256-CBC-SHA:TLS-RSA-WITH-AES-256-CBC-SHA", //nolint:lll
+		"comp-lzo",
+		"key-direction 1",
+		"tun-mtu 1500",
+		"tun-mtu-extra 32",
+		"mssfix " + strconv.Itoa(int(settings.MSSFix)), // defaults to 1450
+
+		// Added constant values
+		"auth-nocache",
+		"mute-replay-warnings",
+		"pull-filter ignore \"auth-token\"", // prevent auth failed loops
+		`pull-filter ignore "ping-restart"`,
+		"auth-retry nointeract",
+		"suppress-timestamps",
+
+		// Modified variables
+		"verb " + strconv.Itoa(settings.Verbosity),
+		"auth-user-pass " + constants.OpenVPNAuthConf,
+		"proto " + connection.Protocol,
+		"remote " + connection.IP.String() + " " + strconv.Itoa(int(connection.Port)),
+		"cipher " + settings.Cipher,
+		"auth " + settings.Auth,
+	}
+	if !settings.Root {
+		lines = append(lines, "user "+username)
+	}
+
+	lines = append(lines, []string{
+		"<ca>",
+		"-----BEGIN CERTIFICATE-----",
+		constants.FastestvpnCertificate,
+		"-----END CERTIFICATE-----",
+		"</ca>",
+	}...)
+
+	lines = append(lines, []string{
+		"<tls-auth>",
+		"-----BEGIN OpenVPN Static key V1-----",
+		constants.FastestvpnOpenvpnStaticKeyV1,
+		"-----END OpenVPN Static key V1-----",
+		"</tls-auth>",
+		"",
+	}...)
+
+	return lines
+}
+
+func (f *fastestvpn) PortForward(ctx context.Context, client *http.Client,
+	openFile os.OpenFileFunc, pfLogger logging.Logger, gateway net.IP, fw firewall.Configurator,
+	syncState func(port uint16) (pfFilepath string)) {
+	panic("port forwarding is not supported for fastestvpn")
+}

internal/provider/provider.go

@@ -27,6 +27,8 @@ func New(provider string, allServers models.AllServers, timeNow timeNowFunc) Pro
 	switch provider {
 	case constants.Cyberghost:
 		return newCyberghost(allServers.Cyberghost.Servers, timeNow)
+	case constants.Fastestvpn:
+		return newFastestvpn(allServers.Fastestvpn.Servers, timeNow)
 	case constants.HideMyAss:
 		return newHideMyAss(allServers.HideMyAss.Servers, timeNow)
 	case constants.Mullvad: