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dialer.go
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dialer.go
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package mtls
import (
"context"
"crypto/tls"
"errors"
"net"
"sync"
"time"
"github.com/go-gost/core/dialer"
"github.com/go-gost/core/logger"
md "github.com/go-gost/core/metadata"
"github.com/wznpp1/gost_x/registry"
"github.com/xtaci/smux"
)
func init() {
registry.DialerRegistry().Register("mtls", NewDialer)
}
type mtlsDialer struct {
sessions map[string]*muxSession
sessionMutex sync.Mutex
logger logger.Logger
md metadata
options dialer.Options
}
func NewDialer(opts ...dialer.Option) dialer.Dialer {
options := dialer.Options{}
for _, opt := range opts {
opt(&options)
}
return &mtlsDialer{
sessions: make(map[string]*muxSession),
logger: options.Logger,
options: options,
}
}
func (d *mtlsDialer) Init(md md.Metadata) (err error) {
if err = d.parseMetadata(md); err != nil {
return
}
return nil
}
// Multiplex implements dialer.Multiplexer interface.
func (d *mtlsDialer) Multiplex() bool {
return true
}
func (d *mtlsDialer) Dial(ctx context.Context, addr string, opts ...dialer.DialOption) (conn net.Conn, err error) {
d.sessionMutex.Lock()
defer d.sessionMutex.Unlock()
session, ok := d.sessions[addr]
if session != nil && session.IsClosed() {
delete(d.sessions, addr) // session is dead
ok = false
}
if !ok {
var options dialer.DialOptions
for _, opt := range opts {
opt(&options)
}
conn, err = options.NetDialer.Dial(ctx, "tcp", addr)
if err != nil {
return
}
session = &muxSession{conn: conn}
d.sessions[addr] = session
}
return session.conn, err
}
// Handshake implements dialer.Handshaker
func (d *mtlsDialer) Handshake(ctx context.Context, conn net.Conn, options ...dialer.HandshakeOption) (net.Conn, error) {
opts := &dialer.HandshakeOptions{}
for _, option := range options {
option(opts)
}
d.sessionMutex.Lock()
defer d.sessionMutex.Unlock()
if d.md.handshakeTimeout > 0 {
conn.SetDeadline(time.Now().Add(d.md.handshakeTimeout))
defer conn.SetDeadline(time.Time{})
}
session, ok := d.sessions[opts.Addr]
if session != nil && session.conn != conn {
conn.Close()
return nil, errors.New("mtls: unrecognized connection")
}
if !ok || session.session == nil {
s, err := d.initSession(ctx, conn)
if err != nil {
d.logger.Error(err)
conn.Close()
delete(d.sessions, opts.Addr)
return nil, err
}
session = s
d.sessions[opts.Addr] = session
}
cc, err := session.GetConn()
if err != nil {
session.Close()
delete(d.sessions, opts.Addr)
return nil, err
}
return cc, nil
}
func (d *mtlsDialer) initSession(ctx context.Context, conn net.Conn) (*muxSession, error) {
tlsConn := tls.Client(conn, d.options.TLSConfig)
if err := tlsConn.HandshakeContext(ctx); err != nil {
return nil, err
}
conn = tlsConn
// stream multiplex
smuxConfig := smux.DefaultConfig()
smuxConfig.KeepAliveDisabled = d.md.muxKeepAliveDisabled
if d.md.muxKeepAliveInterval > 0 {
smuxConfig.KeepAliveInterval = d.md.muxKeepAliveInterval
}
if d.md.muxKeepAliveTimeout > 0 {
smuxConfig.KeepAliveTimeout = d.md.muxKeepAliveTimeout
}
if d.md.muxMaxFrameSize > 0 {
smuxConfig.MaxFrameSize = d.md.muxMaxFrameSize
}
if d.md.muxMaxReceiveBuffer > 0 {
smuxConfig.MaxReceiveBuffer = d.md.muxMaxReceiveBuffer
}
if d.md.muxMaxStreamBuffer > 0 {
smuxConfig.MaxStreamBuffer = d.md.muxMaxStreamBuffer
}
session, err := smux.Client(conn, smuxConfig)
if err != nil {
return nil, err
}
return &muxSession{conn: conn, session: session}, nil
}