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handlers.go
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handlers.go
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package client
import (
"time"
"github.com/libp2p/go-libp2p/core/network"
pbv1 "github.com/libp2p/go-libp2p/p2p/protocol/circuitv1/pb"
pbv2 "github.com/libp2p/go-libp2p/p2p/protocol/circuitv2/pb"
"github.com/libp2p/go-libp2p/p2p/protocol/circuitv2/util"
)
var (
StreamTimeout = 1 * time.Minute
AcceptTimeout = 10 * time.Second
)
func (c *Client) handleStreamV2(s network.Stream) {
log.Debugf("new relay/v2 stream from: %s", s.Conn().RemotePeer())
s.SetReadDeadline(time.Now().Add(StreamTimeout))
rd := util.NewDelimitedReader(s, maxMessageSize)
defer rd.Close()
writeResponse := func(status pbv2.Status) error {
wr := util.NewDelimitedWriter(s)
var msg pbv2.StopMessage
msg.Type = pbv2.StopMessage_STATUS.Enum()
msg.Status = status.Enum()
return wr.WriteMsg(&msg)
}
handleError := func(status pbv2.Status) {
log.Debugf("protocol error: %s (%d)", pbv2.Status_name[int32(status)], status)
err := writeResponse(status)
if err != nil {
s.Reset()
log.Debugf("error writing circuit response: %s", err.Error())
} else {
s.Close()
}
}
var msg pbv2.StopMessage
err := rd.ReadMsg(&msg)
if err != nil {
handleError(pbv2.Status_MALFORMED_MESSAGE)
return
}
// reset stream deadline as message has been read
s.SetReadDeadline(time.Time{})
if msg.GetType() != pbv2.StopMessage_CONNECT {
handleError(pbv2.Status_UNEXPECTED_MESSAGE)
return
}
src, err := util.PeerToPeerInfoV2(msg.GetPeer())
if err != nil {
handleError(pbv2.Status_MALFORMED_MESSAGE)
return
}
// check for a limit provided by the relay; if the limit is not nil, then this is a limited
// relay connection and we mark the connection as transient.
var stat network.ConnStats
if limit := msg.GetLimit(); limit != nil {
stat.Transient = true
stat.Extra = make(map[interface{}]interface{})
stat.Extra[StatLimitDuration] = time.Duration(limit.GetDuration()) * time.Second
stat.Extra[StatLimitData] = limit.GetData()
}
log.Debugf("incoming relay connection from: %s", src.ID)
select {
case c.incoming <- accept{
conn: &Conn{stream: s, remote: src, stat: stat, client: c},
writeResponse: func() error {
return writeResponse(pbv2.Status_OK)
},
}:
case <-time.After(AcceptTimeout):
handleError(pbv2.Status_CONNECTION_FAILED)
}
}
func (c *Client) handleStreamV1(s network.Stream) {
log.Debugf("new relay/v1 stream from: %s", s.Conn().RemotePeer())
s.SetReadDeadline(time.Now().Add(StreamTimeout))
rd := util.NewDelimitedReader(s, maxMessageSize)
defer rd.Close()
writeResponse := func(status pbv1.CircuitRelay_Status) error {
wr := util.NewDelimitedWriter(s)
var msg pbv1.CircuitRelay
msg.Type = pbv1.CircuitRelay_STATUS.Enum()
msg.Code = status.Enum()
return wr.WriteMsg(&msg)
}
handleError := func(status pbv1.CircuitRelay_Status) {
log.Debugf("protocol error: %s (%d)", pbv1.CircuitRelay_Status_name[int32(status)], status)
err := writeResponse(status)
if err != nil {
s.Reset()
log.Debugf("error writing circuit response: %s", err.Error())
} else {
s.Close()
}
}
var msg pbv1.CircuitRelay
err := rd.ReadMsg(&msg)
if err != nil {
handleError(pbv1.CircuitRelay_MALFORMED_MESSAGE)
return
}
// reset stream deadline as message has been read
s.SetReadDeadline(time.Time{})
switch msg.GetType() {
case pbv1.CircuitRelay_STOP:
case pbv1.CircuitRelay_HOP:
handleError(pbv1.CircuitRelay_HOP_CANT_SPEAK_RELAY)
return
case pbv1.CircuitRelay_CAN_HOP:
handleError(pbv1.CircuitRelay_HOP_CANT_SPEAK_RELAY)
return
default:
log.Debugf("unexpected relay handshake: %d", msg.GetType())
handleError(pbv1.CircuitRelay_MALFORMED_MESSAGE)
return
}
src, err := util.PeerToPeerInfoV1(msg.GetSrcPeer())
if err != nil {
handleError(pbv1.CircuitRelay_STOP_SRC_MULTIADDR_INVALID)
return
}
dst, err := util.PeerToPeerInfoV1(msg.GetDstPeer())
if err != nil || dst.ID != c.host.ID() {
handleError(pbv1.CircuitRelay_STOP_DST_MULTIADDR_INVALID)
return
}
log.Debugf("incoming relay connection from: %s", src.ID)
select {
case c.incoming <- accept{
conn: &Conn{stream: s, remote: src, client: c},
writeResponse: func() error {
return writeResponse(pbv1.CircuitRelay_SUCCESS)
},
}:
case <-time.After(AcceptTimeout):
handleError(pbv1.CircuitRelay_STOP_RELAY_REFUSED)
}
}