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packet_handler_map.go
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/
packet_handler_map.go
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package quic
import (
"bytes"
"fmt"
"net"
"sync"
"time"
"github.com/boisjacques/qed/internal/protocol"
"github.com/boisjacques/qed/internal/utils"
"github.com/boisjacques/qed/internal/wire"
)
// The packetHandlerMap stores packetHandlers, identified by Connection ID.
// It is used:
// * by the server to store sessions
// * when multiplexing outgoing connections to store clients
type packetHandlerMap struct {
mutex sync.RWMutex
lock sync.RWMutex
conns map[net.PacketConn]bool
connIDLen int
handlers map[string] /* string(ConnectionID)*/ packetHandler
server unknownPacketHandler
closed bool
deleteClosedSessionsAfter time.Duration
logger utils.Logger
}
var _ packetHandlerManager = &packetHandlerMap{}
func newPacketHandlerMap(conn net.PacketConn, connIDLen int, logger utils.Logger) packetHandlerManager {
m := &packetHandlerMap{
conns: make(map[net.PacketConn]bool),
connIDLen: connIDLen,
handlers: make(map[string]packetHandler),
deleteClosedSessionsAfter: protocol.ClosedSessionDeleteTimeout,
logger: logger,
}
m.conns[conn] = false
go m.listen()
return m
}
func (h *packetHandlerMap) Add(id protocol.ConnectionID, handler packetHandler) {
h.mutex.Lock()
h.handlers[string(id)] = handler
h.mutex.Unlock()
}
func (h *packetHandlerMap) Remove(id protocol.ConnectionID) {
h.removeByConnectionIDAsString(string(id))
}
func (h *packetHandlerMap) removeByConnectionIDAsString(id string) {
h.mutex.Lock()
h.handlers[id] = nil
h.mutex.Unlock()
time.AfterFunc(h.deleteClosedSessionsAfter, func() {
h.mutex.Lock()
delete(h.handlers, id)
h.mutex.Unlock()
})
}
func (h *packetHandlerMap) SetServer(s unknownPacketHandler) {
h.mutex.Lock()
h.server = s
h.mutex.Unlock()
}
func (h *packetHandlerMap) AddConn(conn net.PacketConn) {
h.lock.Lock()
h.conns[conn] = false
h.lock.Unlock()
}
func (h *packetHandlerMap) CloseServer() {
h.mutex.Lock()
h.server = nil
var wg sync.WaitGroup
for id, handler := range h.handlers {
if handler != nil && handler.GetPerspective() == protocol.PerspectiveServer {
wg.Add(1)
go func(id string, handler packetHandler) {
// session.Close() blocks until the CONNECTION_CLOSE has been sent and the run-loop has stopped
_ = handler.Close()
h.removeByConnectionIDAsString(id)
wg.Done()
}(id, handler)
}
}
h.mutex.Unlock()
wg.Wait()
}
func (h *packetHandlerMap) close(e error) error {
h.mutex.Lock()
if h.closed {
h.mutex.Unlock()
return nil
}
h.closed = true
var wg sync.WaitGroup
for _, handler := range h.handlers {
if handler != nil {
wg.Add(1)
go func(handler packetHandler) {
handler.destroy(e)
wg.Done()
}(handler)
}
}
if h.server != nil {
h.server.closeWithError(e)
}
h.mutex.Unlock()
wg.Wait()
return nil
}
func (h *packetHandlerMap) listen() {
for {
h.lock.Lock()
for conn, active := range h.conns {
if !active {
h.conns[conn] = true
go h.listenConn(conn)
}
}
h.lock.Unlock()
}
}
func (h *packetHandlerMap) listenConn(conn net.PacketConn) {
for {
data := *getPacketBuffer()
data = data[:protocol.MaxReceivePacketSize]
// The packet size should not exceed protocol.MaxReceivePacketSize bytes
// If it does, we only read a truncated packet, which will then end up undecryptable
n, addr, err := conn.ReadFrom(data)
if err != nil {
panic(err)
h.close(err)
return
}
data = data[:n]
if err := h.handlePacket(addr, data); err != nil {
h.logger.Debugf("error handling packet from %s: %s", addr, err)
}
}
}
func (h *packetHandlerMap) handlePacket(addr net.Addr, data []byte) error {
rcvTime := time.Now()
r := bytes.NewReader(data)
iHdr, err := wire.ParseInvariantHeader(r, h.connIDLen)
// drop the packet if we can't parse the header
if err != nil {
return fmt.Errorf("error parsing invariant header: %s", err)
}
h.mutex.RLock()
handler, ok := h.handlers[string(iHdr.DestConnectionID)]
server := h.server
h.mutex.RUnlock()
var sentBy protocol.Perspective
var version protocol.VersionNumber
var handlePacket func(*receivedPacket)
if ok && handler == nil {
// Late packet for closed session
return nil
}
if !ok {
if server == nil { // no server set
return fmt.Errorf("received a packet with an unexpected Connection ID %s", iHdr.DestConnectionID)
}
handlePacket = server.handlePacket
sentBy = protocol.PerspectiveClient
version = iHdr.Version
} else {
sentBy = handler.GetPerspective().Opposite()
version = handler.GetVersion()
handlePacket = handler.handlePacket
}
hdr, err := iHdr.Parse(r, sentBy, version)
if err != nil {
return fmt.Errorf("error parsing header: %s", err)
}
hdr.Raw = data[:len(data)-r.Len()]
packetData := data[len(data)-r.Len():]
if hdr.IsLongHeader {
if protocol.ByteCount(len(packetData)) < hdr.PayloadLen {
return fmt.Errorf("packet payload (%d bytes) is smaller than the expected payload length (%d bytes)", len(packetData), hdr.PayloadLen)
}
packetData = packetData[:int(hdr.PayloadLen)]
// TODO(#1312): implement parsing of compound packets
}
handlePacket(&receivedPacket{
remoteAddr: addr,
header: hdr,
data: packetData,
rcvTime: rcvTime,
})
return nil
}