Maintenance: split each provider in a package

- Fix VyprVPN port
- Fix missing Auth overrides

internal/provider/privateinternetaccess/openvpnconf.go

@@ -0,0 +1,83 @@
+package privateinternetaccess
+
+import (
+	"strconv"
+	"strings"
+
+	"github.com/qdm12/gluetun/internal/configuration"
+	"github.com/qdm12/gluetun/internal/constants"
+	"github.com/qdm12/gluetun/internal/models"
+	"github.com/qdm12/gluetun/internal/provider/utils"
+)
+
+func (p *PIA) BuildConf(connection models.OpenVPNConnection,
+	username string, settings configuration.OpenVPN) (lines []string) {
+	var defaultCipher, defaultAuth, X509CRL, certificate string
+	if settings.Provider.ExtraConfigOptions.EncryptionPreset == constants.PIAEncryptionPresetNormal {
+		defaultCipher = constants.AES128cbc
+		defaultAuth = constants.SHA1
+		X509CRL = constants.PiaX509CRLNormal
+		certificate = constants.PIACertificateNormal
+	} else { // strong encryption
+		defaultCipher = constants.AES256cbc
+		defaultAuth = constants.SHA256
+		X509CRL = constants.PiaX509CRLStrong
+		certificate = constants.PIACertificateStrong
+	}
+
+	if settings.Cipher == "" {
+		settings.Cipher = defaultCipher
+	}
+
+	if settings.Auth == "" {
+		settings.Auth = defaultAuth
+	}
+
+	lines = []string{
+		"client",
+		"dev tun",
+		"nobind",
+		"persist-key",
+		"remote-cert-tls server",
+
+		// PIA specific
+		"reneg-sec 0",
+		"disable-occ",
+		"compress", // allow PIA server to choose the compression to use
+
+		// Added constant values
+		"auth-nocache",
+		"mute-replay-warnings",
+		"pull-filter ignore \"auth-token\"", // prevent auth failed loops
+		"auth-retry nointeract",
+		"suppress-timestamps",
+
+		// Modified variables
+		"verb " + strconv.Itoa(settings.Verbosity),
+		"auth-user-pass " + constants.OpenVPNAuthConf,
+		connection.ProtoLine(),
+		connection.RemoteLine(),
+		"data-ciphers-fallback " + settings.Cipher,
+		"data-ciphers " + settings.Cipher,
+		"auth " + settings.Auth,
+	}
+
+	if strings.HasSuffix(settings.Cipher, "-gcm") {
+		lines = append(lines, "ncp-disable")
+	}
+
+	if !settings.Root {
+		lines = append(lines, "user "+username)
+	}
+
+	if settings.MSSFix > 0 {
+		lines = append(lines, "mssfix "+strconv.Itoa(int(settings.MSSFix)))
+	}
+
+	lines = append(lines, utils.WrapOpenvpnCA(certificate)...)
+	lines = append(lines, utils.WrapOpenvpnCRLVerify(X509CRL)...)
+
+	lines = append(lines, "")
+
+	return lines
+}