155 lines
4.0 KiB
Go
155 lines
4.0 KiB
Go
package provider
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import (
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"context"
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"fmt"
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"math/rand"
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"net"
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"net/http"
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"strconv"
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"github.com/qdm12/gluetun/internal/configuration"
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"github.com/qdm12/gluetun/internal/constants"
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"github.com/qdm12/gluetun/internal/firewall"
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"github.com/qdm12/gluetun/internal/models"
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"github.com/qdm12/golibs/logging"
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"github.com/qdm12/golibs/os"
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)
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type surfshark struct {
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servers []models.SurfsharkServer
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randSource rand.Source
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}
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func newSurfshark(servers []models.SurfsharkServer, timeNow timeNowFunc) *surfshark {
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return &surfshark{
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servers: servers,
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randSource: rand.NewSource(timeNow().UnixNano()),
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}
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}
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func (s *surfshark) filterServers(regions []string) (servers []models.SurfsharkServer) {
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for _, server := range s.servers {
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switch {
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case
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filterByPossibilities(server.Region, regions):
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default:
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servers = append(servers, server)
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}
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}
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return servers
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}
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func (s *surfshark) GetOpenVPNConnection(selection configuration.ServerSelection) (
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connection models.OpenVPNConnection, err error) {
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var port uint16
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switch {
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case selection.Protocol == constants.TCP:
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port = 1443
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case selection.Protocol == constants.UDP:
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port = 1194
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default:
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return connection, fmt.Errorf("protocol %q is unknown", selection.Protocol)
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}
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if selection.TargetIP != nil {
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return models.OpenVPNConnection{IP: selection.TargetIP, Port: port, Protocol: selection.Protocol}, nil
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}
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servers := s.filterServers(selection.Regions)
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if len(servers) == 0 {
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return connection, fmt.Errorf("no server found for region %s", commaJoin(selection.Regions))
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}
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var connections []models.OpenVPNConnection
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for _, server := range servers {
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for _, IP := range server.IPs {
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connections = append(connections, models.OpenVPNConnection{IP: IP, Port: port, Protocol: selection.Protocol})
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}
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}
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if selection.TargetIP != nil {
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return connection, fmt.Errorf("target IP %s not found in IP addresses", selection.TargetIP)
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}
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return pickRandomConnection(connections, s.randSource), nil
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}
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func (s *surfshark) BuildConf(connection models.OpenVPNConnection,
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username string, settings configuration.OpenVPN) (lines []string) {
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if len(settings.Cipher) == 0 {
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settings.Cipher = aes256cbc
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}
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if len(settings.Auth) == 0 {
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settings.Auth = "SHA512"
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}
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const defaultMSSFix = 1450
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if settings.MSSFix == 0 {
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settings.MSSFix = defaultMSSFix
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}
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lines = []string{
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"client",
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"dev tun",
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"nobind",
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"persist-key",
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"remote-cert-tls server",
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"ping 10",
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"ping-exit 60",
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"ping-timer-rem",
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"tls-exit",
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// Surfshark specific
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"tun-mtu 1500",
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"tun-mtu-extra 32",
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"mssfix " + strconv.Itoa(int(settings.MSSFix)),
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"reneg-sec 0",
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"fast-io",
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"key-direction 1",
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"script-security 2",
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// Added constant values
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"auth-nocache",
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"mute-replay-warnings",
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"pull-filter ignore \"auth-token\"", // prevent auth failed loops
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"pull-filter ignore \"block-outside-dns\"",
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`pull-filter ignore "ping-restart"`,
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"auth-retry nointeract",
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"suppress-timestamps",
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// Modified variables
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fmt.Sprintf("verb %d", settings.Verbosity),
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fmt.Sprintf("auth-user-pass %s", constants.OpenVPNAuthConf),
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fmt.Sprintf("proto %s", connection.Protocol),
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fmt.Sprintf("remote %s %d", connection.IP, connection.Port),
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fmt.Sprintf("cipher %s", settings.Cipher),
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fmt.Sprintf("auth %s", settings.Auth),
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}
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if !settings.Root {
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lines = append(lines, "user "+username)
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}
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lines = append(lines, []string{
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"<ca>",
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"-----BEGIN CERTIFICATE-----",
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constants.SurfsharkCertificate,
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"-----END CERTIFICATE-----",
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"</ca>",
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}...)
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lines = append(lines, []string{
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"<tls-auth>",
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"-----BEGIN OpenVPN Static key V1-----",
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constants.SurfsharkOpenvpnStaticKeyV1,
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"-----END OpenVPN Static key V1-----",
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"</tls-auth>",
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"",
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}...)
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return lines
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}
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func (s *surfshark) PortForward(ctx context.Context, client *http.Client,
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openFile os.OpenFileFunc, pfLogger logging.Logger, gateway net.IP, fw firewall.Configurator,
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syncState func(port uint16) (pfFilepath models.Filepath)) {
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panic("port forwarding is not supported for surfshark")
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}
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