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dialer.go
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dialer.go
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package quic
import (
"context"
"errors"
"net"
"sync"
"github.com/go-gost/core/dialer"
"github.com/go-gost/core/logger"
md "github.com/go-gost/core/metadata"
quic_util "github.com/goxpx/x/internal/util/quic"
"github.com/goxpx/x/registry"
"github.com/quic-go/quic-go"
)
func init() {
registry.DialerRegistry().Register("quic", NewDialer)
}
type quicDialer struct {
sessions map[string]*quicSession
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 &quicDialer{
sessions: make(map[string]*quicSession),
logger: options.Logger,
options: options,
}
}
func (d *quicDialer) Init(md md.Metadata) (err error) {
if err = d.parseMetadata(md); err != nil {
return
}
return nil
}
func (d *quicDialer) Dial(ctx context.Context, addr string, opts ...dialer.DialOption) (conn net.Conn, err error) {
if _, _, err := net.SplitHostPort(addr); err != nil {
addr = net.JoinHostPort(addr, "0")
}
udpAddr, err := net.ResolveUDPAddr("udp", addr)
if err != nil {
return nil, err
}
d.sessionMutex.Lock()
defer d.sessionMutex.Unlock()
session, ok := d.sessions[addr]
if !ok {
options := &dialer.DialOptions{}
for _, opt := range opts {
opt(options)
}
c, err := options.NetDialer.Dial(ctx, "udp", "")
if err != nil {
return nil, err
}
pc, ok := c.(net.PacketConn)
if !ok {
c.Close()
return nil, errors.New("quic: wrong connection type")
}
if d.md.cipherKey != nil {
pc = quic_util.CipherPacketConn(pc, d.md.cipherKey)
}
session, err = d.initSession(ctx, udpAddr, pc)
if err != nil {
d.logger.Error(err)
pc.Close()
return nil, err
}
d.sessions[addr] = session
}
conn, err = session.GetConn()
if err != nil {
session.Close()
delete(d.sessions, addr)
return nil, err
}
return
}
func (d *quicDialer) initSession(ctx context.Context, addr net.Addr, conn net.PacketConn) (*quicSession, error) {
quicConfig := &quic.Config{
KeepAlivePeriod: d.md.keepAlivePeriod,
HandshakeIdleTimeout: d.md.handshakeTimeout,
MaxIdleTimeout: d.md.maxIdleTimeout,
Versions: []quic.VersionNumber{
quic.Version1,
quic.Version2,
},
MaxIncomingStreams: int64(d.md.maxStreams),
}
tlsCfg := d.options.TLSConfig
tlsCfg.NextProtos = []string{"http/3", "quic/v1"}
session, err := quic.DialEarly(ctx, conn, addr, tlsCfg, quicConfig)
if err != nil {
return nil, err
}
return &quicSession{session: session}, nil
}
// Multiplex implements dialer.Multiplexer interface.
func (d *quicDialer) Multiplex() bool {
return true
}