feat: add hysteria2 protocol dialer support

dialer/hysteria2/hysteria2.go

@@ -0,0 +1,134 @@
+package hysteria2
+
+import (
+	"crypto/sha256"
+	"crypto/tls"
+	"crypto/x509"
+	"encoding/hex"
+	"errors"
+	"net"
+	"net/url"
+	"strconv"
+	"strings"
+
+	"github.com/daeuniverse/outbound/dialer"
+	"github.com/daeuniverse/outbound/netproxy"
+	"github.com/daeuniverse/outbound/protocol"
+)
+
+func init() {
+	dialer.FromLinkRegister("hysteria2", NewHysteria2)
+	dialer.FromLinkRegister("hy2", NewHysteria2)
+}
+
+type Hysteria2 struct {
+	Name      string
+	User      string
+	Server    string
+	Port      int
+	Insecure  bool
+	Sni       string
+	PinSHA256 string
+}
+
+func NewHysteria2(option *dialer.ExtraOption, nextDialer netproxy.Dialer, link string) (netproxy.Dialer, *dialer.Property, error) {
+	s, err := ParseHysteria2URL(link)
+	if err != nil {
+		return nil, nil, err
+	}
+	return s.Dialer(option, nextDialer)
+}
+
+func (s *Hysteria2) Dialer(option *dialer.ExtraOption, nextDialer netproxy.Dialer) (netproxy.Dialer, *dialer.Property, error) {
+	d := nextDialer
+	proxyAddress := net.JoinHostPort(s.Server, strconv.Itoa(s.Port))
+	header := protocol.Header{
+		ProxyAddress: proxyAddress,
+		TlsConfig: &tls.Config{
+			ServerName:         s.Sni,
+			InsecureSkipVerify: s.Insecure || option.AllowInsecure,
+		},
+		SNI:      s.Sni,
+		User:     s.User,
+		IsClient: true,
+	}
+	if s.PinSHA256 != "" {
+		nHash := normalizeCertHash(s.PinSHA256)
+		header.TlsConfig.VerifyPeerCertificate = func(rawCerts [][]byte, _ [][]*x509.Certificate) error {
+			for _, cert := range rawCerts {
+				hash := sha256.Sum256(cert)
+				hashHex := hex.EncodeToString(hash[:])
+				if hashHex == nHash {
+					return nil
+				}
+			}
+			// No match
+			return errors.New("no certificate matches the pinned hash")
+		}
+	}
+	var err error
+	if d, err = protocol.NewDialer("hysteria2", d, header); err != nil {
+		return nil, nil, err
+	}
+	return d, &dialer.Property{
+		Name:     s.Name,
+		Address:  proxyAddress,
+		Protocol: "hysteria2",
+		Link:     s.ExportToURL(),
+	}, nil
+}
+
+func normalizeCertHash(hash string) string {
+	r := strings.ToLower(hash)
+	r = strings.ReplaceAll(r, ":", "")
+	r = strings.ReplaceAll(r, "-", "")
+	return r
+}
+
+// ref: https://v2.hysteria.network/zh/docs/developers/URI-Scheme/
+func ParseHysteria2URL(link string) (*Hysteria2, error) {
+	// TODO: support salamander obfuscation
+	t, err := url.Parse(link)
+	if err != nil {
+		return nil, err
+	}
+	port, err := strconv.Atoi(t.Port())
+	if err != nil {
+		return nil, dialer.InvalidParameterErr
+	}
+	q := t.Query()
+	sni := q.Get("sni")
+	if sni == "" {
+		sni = t.Hostname()
+	}
+	return &Hysteria2{
+		Name:      t.Fragment,
+		User:      t.User.String(),
+		Server:    t.Hostname(),
+		Port:      port,
+		Insecure:  q.Get("insecure") == "1",
+		Sni:       sni,
+		PinSHA256: q.Get("pinSHA256"),
+	}, nil
+}
+
+func (s *Hysteria2) ExportToURL() string {
+	t := url.URL{
+		Scheme:   "hysteria2",
+		Host:     net.JoinHostPort(s.Server, strconv.Itoa(s.Port)),
+		User:     url.User(s.User),
+		Fragment: s.Name,
+	}
+	q := t.Query()
+	if s.Insecure {
+		q.Set("insecure", "1")
+	}
+	if s.Sni != "" {
+		q.Set("sni", s.Sni)
+	}
+	if s.PinSHA256 != "" {
+		q.Set("pinSHA256", s.PinSHA256)
+	}
+	t.RawQuery = q.Encode()
+	return t.String()
+}

go.mod

@@ -35,6 +35,7 @@ require (
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/modern-go/reflect2 v1.0.2 // indirect
 	github.com/onsi/ginkgo/v2 v2.11.0 // indirect
+	github.com/quic-go/qpack v0.4.0 // indirect
 	go.uber.org/mock v0.4.0 // indirect
 	golang.org/x/mod v0.12.0 // indirect
 	golang.org/x/text v0.14.0 // indirect

go.sum

@@ -53,6 +53,8 @@ github.com/onsi/gomega v1.27.8 h1:gegWiwZjBsf2DgiSbf5hpokZ98JVDMcWkUiigk6/KXc=
 github.com/onsi/gomega v1.27.8/go.mod h1:2J8vzI/s+2shY9XHRApDkdgPo1TKT7P2u6fXeJKFnNQ=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/quic-go/qpack v0.4.0 h1:Cr9BXA1sQS2SmDUWjSofMPNKmvF6IiIfDRmgU0w1ZCo=
+github.com/quic-go/qpack v0.4.0/go.mod h1:UZVnYIfi5GRk+zI9UMaCPsmZ2xKJP7XBUvVyT1Knj9A=
 github.com/refraction-networking/utls v1.6.4 h1:aeynTroaYn7y+mFtqv8D0bQ4bw0y9nJHneGxJ7lvRDM=
 github.com/refraction-networking/utls v1.6.4/go.mod h1:2VL2xfiqgFAZtJKeUTlf+PSYFs3Eu7km0gCtXJ3m8zs=
 github.com/seiflotfy/cuckoofilter v0.0.0-20220411075957-e3b120b3f5fb h1:XfLJSPIOUX+osiMraVgIrMR27uMXnRJWGm1+GL8/63U=

protocol/hysteria2/README.md

@@ -0,0 +1,17 @@
+# Hysteria2
+
+This part of the code is modified from [`apernet/hysteria`](https://github.com/apernet/hysteria/) with many thanks.
+
+## License
+
+See the [LICENSE](/LICENSE) file for license rights and limitations.
+
+Portions of this code are derived from the Hysteria project under the [MIT License](https://github.com/apernet/hysteria/blob/52c8f82c2ba3172660152b3d6918797dd49eff13/LICENSE.md):
+
+    Copyright 2023 Toby
+
+    Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+    The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+    THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.