clash/adapters/outbound/vmess.go
2021-04-29 11:23:14 +08:00

354 lines
8.7 KiB
Go

package outbound
import (
"context"
"crypto/tls"
"errors"
"fmt"
"net"
"net/http"
"strconv"
"strings"
"github.com/Dreamacro/clash/component/dialer"
"github.com/Dreamacro/clash/component/gun"
"github.com/Dreamacro/clash/component/resolver"
"github.com/Dreamacro/clash/component/vmess"
C "github.com/Dreamacro/clash/constant"
"golang.org/x/net/http2"
)
type Vmess struct {
*Base
client *vmess.Client
option *VmessOption
// for gun mux
gunTLSConfig *tls.Config
gunConfig *gun.Config
transport *http2.Transport
}
type VmessOption struct {
Name string `proxy:"name"`
Server string `proxy:"server"`
Port int `proxy:"port"`
UUID string `proxy:"uuid"`
AlterID int `proxy:"alterId"`
Cipher string `proxy:"cipher"`
TLS bool `proxy:"tls,omitempty"`
UDP bool `proxy:"udp,omitempty"`
Network string `proxy:"network,omitempty"`
HTTPOpts HTTPOptions `proxy:"http-opts,omitempty"`
HTTP2Opts HTTP2Options `proxy:"h2-opts,omitempty"`
GrpcOpts GrpcOptions `proxy:"grpc-opts,omitempty"`
WSPath string `proxy:"ws-path,omitempty"`
WSHeaders map[string]string `proxy:"ws-headers,omitempty"`
SkipCertVerify bool `proxy:"skip-cert-verify,omitempty"`
ServerName string `proxy:"servername,omitempty"`
}
type HTTPOptions struct {
Method string `proxy:"method,omitempty"`
Path []string `proxy:"path,omitempty"`
Headers map[string][]string `proxy:"headers,omitempty"`
}
type HTTP2Options struct {
Host []string `proxy:"host,omitempty"`
Path string `proxy:"path,omitempty"`
}
type GrpcOptions struct {
GrpcServiceName string `proxy:"grpc-service-name,omitempty"`
}
// StreamConn implements C.ProxyAdapter
func (v *Vmess) StreamConn(c net.Conn, metadata *C.Metadata) (net.Conn, error) {
var err error
switch v.option.Network {
case "ws":
host, port, _ := net.SplitHostPort(v.addr)
wsOpts := &vmess.WebsocketConfig{
Host: host,
Port: port,
Path: v.option.WSPath,
}
if len(v.option.WSHeaders) != 0 {
header := http.Header{}
for key, value := range v.option.WSHeaders {
header.Add(key, value)
}
wsOpts.Headers = header
}
if v.option.TLS {
wsOpts.TLS = true
wsOpts.SessionCache = getClientSessionCache()
wsOpts.SkipCertVerify = v.option.SkipCertVerify
wsOpts.ServerName = v.option.ServerName
}
c, err = vmess.StreamWebsocketConn(c, wsOpts)
case "http":
// readability first, so just copy default TLS logic
if v.option.TLS {
host, _, _ := net.SplitHostPort(v.addr)
tlsOpts := &vmess.TLSConfig{
Host: host,
SkipCertVerify: v.option.SkipCertVerify,
SessionCache: getClientSessionCache(),
}
if v.option.ServerName != "" {
tlsOpts.Host = v.option.ServerName
}
c, err = vmess.StreamTLSConn(c, tlsOpts)
if err != nil {
return nil, err
}
}
host, _, _ := net.SplitHostPort(v.addr)
httpOpts := &vmess.HTTPConfig{
Host: host,
Method: v.option.HTTPOpts.Method,
Path: v.option.HTTPOpts.Path,
Headers: v.option.HTTPOpts.Headers,
}
c = vmess.StreamHTTPConn(c, httpOpts)
case "h2":
host, _, _ := net.SplitHostPort(v.addr)
tlsOpts := vmess.TLSConfig{
Host: host,
SkipCertVerify: v.option.SkipCertVerify,
SessionCache: getClientSessionCache(),
NextProtos: []string{"h2"},
}
if v.option.ServerName != "" {
tlsOpts.Host = v.option.ServerName
}
c, err = vmess.StreamTLSConn(c, &tlsOpts)
if err != nil {
return nil, err
}
h2Opts := &vmess.H2Config{
Hosts: v.option.HTTP2Opts.Host,
Path: v.option.HTTP2Opts.Path,
}
c, err = vmess.StreamH2Conn(c, h2Opts)
case "grpc":
c, err = gun.StreamGunWithConn(c, v.gunTLSConfig, v.gunConfig)
default:
// handle TLS
if v.option.TLS {
host, _, _ := net.SplitHostPort(v.addr)
tlsOpts := &vmess.TLSConfig{
Host: host,
SkipCertVerify: v.option.SkipCertVerify,
SessionCache: getClientSessionCache(),
}
if v.option.ServerName != "" {
tlsOpts.Host = v.option.ServerName
}
c, err = vmess.StreamTLSConn(c, tlsOpts)
}
}
if err != nil {
return nil, err
}
return v.client.StreamConn(c, parseVmessAddr(metadata))
}
// DialContext implements C.ProxyAdapter
func (v *Vmess) DialContext(ctx context.Context, metadata *C.Metadata) (_ C.Conn, err error) {
// gun transport
if v.transport != nil {
c, err := gun.StreamGunWithTransport(v.transport, v.gunConfig)
if err != nil {
return nil, err
}
defer safeConnClose(c, err)
c, err = v.client.StreamConn(c, parseVmessAddr(metadata))
if err != nil {
return nil, err
}
return NewConn(c, v), nil
}
c, err := dialer.DialContext(ctx, "tcp", v.addr)
if err != nil {
return nil, fmt.Errorf("%s connect error: %s", v.addr, err.Error())
}
tcpKeepAlive(c)
defer safeConnClose(c, err)
c, err = v.StreamConn(c, metadata)
return NewConn(c, v), err
}
// DialUDP implements C.ProxyAdapter
func (v *Vmess) DialUDP(metadata *C.Metadata) (_ C.PacketConn, err error) {
// vmess use stream-oriented udp with a special address, so we needs a net.UDPAddr
if !metadata.Resolved() {
ip, err := resolver.ResolveIP(metadata.Host)
if err != nil {
return nil, errors.New("can't resolve ip")
}
metadata.DstIP = ip
}
var c net.Conn
// gun transport
if v.transport != nil {
c, err = gun.StreamGunWithTransport(v.transport, v.gunConfig)
if err != nil {
return nil, err
}
defer safeConnClose(c, err)
c, err = v.client.StreamConn(c, parseVmessAddr(metadata))
} else {
ctx, cancel := context.WithTimeout(context.Background(), tcpTimeout)
defer cancel()
c, err = dialer.DialContext(ctx, "tcp", v.addr)
if err != nil {
return nil, fmt.Errorf("%s connect error: %s", v.addr, err.Error())
}
tcpKeepAlive(c)
defer safeConnClose(c, err)
c, err = v.StreamConn(c, metadata)
}
if err != nil {
return nil, fmt.Errorf("new vmess client error: %v", err)
}
return newPacketConn(&vmessPacketConn{Conn: c, rAddr: metadata.UDPAddr()}, v), nil
}
func NewVmess(option VmessOption) (*Vmess, error) {
security := strings.ToLower(option.Cipher)
client, err := vmess.NewClient(vmess.Config{
UUID: option.UUID,
AlterID: uint16(option.AlterID),
Security: security,
HostName: option.Server,
Port: strconv.Itoa(option.Port),
IsAead: option.AlterID == 0,
})
if err != nil {
return nil, err
}
switch option.Network {
case "h2", "grpc":
if !option.TLS {
return nil, fmt.Errorf("TLS must be true with h2/grpc network")
}
}
v := &Vmess{
Base: &Base{
name: option.Name,
addr: net.JoinHostPort(option.Server, strconv.Itoa(option.Port)),
tp: C.Vmess,
udp: option.UDP,
},
client: client,
option: &option,
}
switch option.Network {
case "h2":
if len(option.HTTP2Opts.Host) == 0 {
option.HTTP2Opts.Host = append(option.HTTP2Opts.Host, "www.example.com")
}
case "grpc":
dialFn := func(network, addr string) (net.Conn, error) {
c, err := dialer.DialContext(context.Background(), "tcp", v.addr)
if err != nil {
return nil, fmt.Errorf("%s connect error: %s", v.addr, err.Error())
}
tcpKeepAlive(c)
return c, nil
}
gunConfig := &gun.Config{
ServiceName: v.option.GrpcOpts.GrpcServiceName,
Host: v.option.ServerName,
}
tlsConfig := &tls.Config{
InsecureSkipVerify: v.option.SkipCertVerify,
ServerName: v.option.ServerName,
}
if v.option.ServerName == "" {
host, _, _ := net.SplitHostPort(v.addr)
tlsConfig.ServerName = host
gunConfig.Host = host
}
v.gunTLSConfig = tlsConfig
v.gunConfig = gunConfig
v.transport = gun.NewHTTP2Client(dialFn, tlsConfig)
}
return v, nil
}
func parseVmessAddr(metadata *C.Metadata) *vmess.DstAddr {
var addrType byte
var addr []byte
switch metadata.AddrType {
case C.AtypIPv4:
addrType = byte(vmess.AtypIPv4)
addr = make([]byte, net.IPv4len)
copy(addr[:], metadata.DstIP.To4())
case C.AtypIPv6:
addrType = byte(vmess.AtypIPv6)
addr = make([]byte, net.IPv6len)
copy(addr[:], metadata.DstIP.To16())
case C.AtypDomainName:
addrType = byte(vmess.AtypDomainName)
addr = make([]byte, len(metadata.Host)+1)
addr[0] = byte(len(metadata.Host))
copy(addr[1:], []byte(metadata.Host))
}
port, _ := strconv.Atoi(metadata.DstPort)
return &vmess.DstAddr{
UDP: metadata.NetWork == C.UDP,
AddrType: addrType,
Addr: addr,
Port: uint(port),
}
}
type vmessPacketConn struct {
net.Conn
rAddr net.Addr
}
func (uc *vmessPacketConn) WriteTo(b []byte, addr net.Addr) (int, error) {
return uc.Conn.Write(b)
}
func (uc *vmessPacketConn) ReadFrom(b []byte) (int, net.Addr, error) {
n, err := uc.Conn.Read(b)
return n, uc.rAddr, err
}