forked from quic-go/quic-go
/
server.go
200 lines (173 loc) · 4.75 KB
/
server.go
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package quic
import (
"bytes"
"crypto/tls"
"net"
"strings"
"sync"
"github.com/lucas-clemente/quic-go/crypto"
"github.com/lucas-clemente/quic-go/handshake"
"github.com/lucas-clemente/quic-go/protocol"
"github.com/lucas-clemente/quic-go/qerr"
"github.com/lucas-clemente/quic-go/utils"
)
// packetHandler handles packets
type packetHandler interface {
handlePacket(addr interface{}, hdr *publicHeader, data []byte)
run()
Close(error) error
}
// A Server of QUIC
type Server struct {
addr *net.UDPAddr
conn *net.UDPConn
connMutex sync.Mutex
signer crypto.Signer
scfg *handshake.ServerConfig
sessions map[protocol.ConnectionID]packetHandler
sessionsMutex sync.RWMutex
streamCallback StreamCallback
newSession func(conn connection, v protocol.VersionNumber, connectionID protocol.ConnectionID, sCfg *handshake.ServerConfig, streamCallback StreamCallback, closeCallback closeCallback) (packetHandler, error)
}
// NewServer makes a new server
func NewServer(addr string, tlsConfig *tls.Config, cb StreamCallback) (*Server, error) {
signer, err := crypto.NewProofSource(tlsConfig)
if err != nil {
return nil, err
}
kex, err := crypto.NewCurve25519KEX()
if err != nil {
return nil, err
}
scfg, err := handshake.NewServerConfig(kex, signer)
if err != nil {
return nil, err
}
udpAddr, err := net.ResolveUDPAddr("udp", addr)
if err != nil {
return nil, err
}
return &Server{
addr: udpAddr,
signer: signer,
scfg: scfg,
streamCallback: cb,
sessions: map[protocol.ConnectionID]packetHandler{},
newSession: newSession,
}, nil
}
// ListenAndServe listens and serves a connection
func (s *Server) ListenAndServe() error {
conn, err := net.ListenUDP("udp", s.addr)
if err != nil {
return err
}
return s.Serve(conn)
}
// Serve on an existing UDP connection.
func (s *Server) Serve(conn *net.UDPConn) error {
s.connMutex.Lock()
s.conn = conn
s.connMutex.Unlock()
for {
data := make([]byte, protocol.MaxPacketSize)
n, remoteAddr, err := conn.ReadFromUDP(data)
if err != nil {
if strings.HasSuffix(err.Error(), "use of closed network connection") {
return nil
}
return err
}
data = data[:n]
if err := s.handlePacket(conn, remoteAddr, data); err != nil {
utils.Errorf("error handling packet: %s", err.Error())
}
}
}
// Close the server
func (s *Server) Close() error {
s.sessionsMutex.Lock()
for _, session := range s.sessions {
if session != nil {
s.sessionsMutex.Unlock()
_ = session.Close(nil)
s.sessionsMutex.Lock()
}
}
s.sessionsMutex.Unlock()
s.connMutex.Lock()
conn := s.conn
s.conn = nil
s.connMutex.Unlock()
if conn == nil {
return nil
}
return conn.Close()
}
func (s *Server) handlePacket(conn *net.UDPConn, remoteAddr *net.UDPAddr, packet []byte) error {
if protocol.ByteCount(len(packet)) > protocol.MaxPacketSize {
return qerr.PacketTooLarge
}
r := bytes.NewReader(packet)
hdr, err := parsePublicHeader(r)
if err != nil {
return qerr.Error(qerr.InvalidPacketHeader, err.Error())
}
hdr.Raw = packet[:len(packet)-r.Len()]
// Send Version Negotiation Packet if the client is speaking a different protocol version
if hdr.VersionFlag && !protocol.IsSupportedVersion(hdr.VersionNumber) {
utils.Infof("Client offered version %d, sending VersionNegotiationPacket", hdr.VersionNumber)
_, err = conn.WriteToUDP(composeVersionNegotiation(hdr.ConnectionID), remoteAddr)
if err != nil {
return err
}
return nil
}
s.sessionsMutex.RLock()
session, ok := s.sessions[hdr.ConnectionID]
s.sessionsMutex.RUnlock()
if !ok {
utils.Infof("Serving new connection: %x, version %d from %v", hdr.ConnectionID, hdr.VersionNumber, remoteAddr)
session, err = s.newSession(
&udpConn{conn: conn, currentAddr: remoteAddr},
hdr.VersionNumber,
hdr.ConnectionID,
s.scfg,
s.streamCallback,
s.closeCallback,
)
if err != nil {
return err
}
go session.run()
s.sessionsMutex.Lock()
s.sessions[hdr.ConnectionID] = session
s.sessionsMutex.Unlock()
}
if session == nil {
// Late packet for closed session
return nil
}
session.handlePacket(remoteAddr, hdr, packet[len(packet)-r.Len():])
return nil
}
func (s *Server) closeCallback(id protocol.ConnectionID) {
s.sessionsMutex.Lock()
s.sessions[id] = nil
s.sessionsMutex.Unlock()
}
func composeVersionNegotiation(connectionID protocol.ConnectionID) []byte {
fullReply := &bytes.Buffer{}
responsePublicHeader := publicHeader{
ConnectionID: connectionID,
PacketNumber: 1,
VersionFlag: true,
}
// TODO: Update version number
err := responsePublicHeader.WritePublicHeader(fullReply, protocol.Version32)
if err != nil {
utils.Errorf("error composing version negotiation packet: %s", err.Error())
}
fullReply.Write(protocol.SupportedVersionsAsTags)
return fullReply.Bytes()
}