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Improve errors and handling of expired sessions

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This commit is contained in:
Neil Alexander 2019-04-19 23:30:43 +01:00
parent 7e726b0afb
commit e31b914e38
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GPG Key ID: A02A2019A2BB0944
2 changed files with 16 additions and 7 deletions
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22
src/yggdrasil/conn.go
View File

@ -17,6 +17,7 @@ type Conn struct {
session *sessionInfo
readDeadline time.Time
writeDeadline time.Time
expired bool
}
// This method should only be called from the router goroutine
@ -60,8 +61,11 @@ func (c *Conn) startSearch() {
}
func (c *Conn) Read(b []byte) (int, error) {
if c.expired {
return 0, errors.New("session is closed")
}
if c.session == nil {
return 0, errors.New("session not ready yet")
return 0, errors.New("searching for remote side")
}
if !c.session.init {
return 0, errors.New("waiting for remote side to accept")
@ -69,7 +73,8 @@ func (c *Conn) Read(b []byte) (int, error) {
select {
case p, ok := <-c.session.recv:
if !ok {
return 0, errors.New("session was closed")
c.expired = true
return 0, errors.New("session is closed")
}
defer util.PutBytes(p.Payload)
err := func() error {
@ -83,7 +88,6 @@ func (c *Conn) Read(b []byte) (int, error) {
util.PutBytes(bs)
return errors.New("packet dropped due to decryption failure")
}
// c.core.log.Println("HOW MANY BYTES?", len(bs))
b = b[:0]
b = append(b, bs...)
c.session.updateNonce(&p.Nonce)
@ -96,16 +100,20 @@ func (c *Conn) Read(b []byte) (int, error) {
atomic.AddUint64(&c.session.bytesRecvd, uint64(len(b)))
return len(b), nil
case <-c.session.closed:
return len(b), errors.New("session closed")
c.expired = true
return len(b), errors.New("session is closed")
}
}
func (c *Conn) Write(b []byte) (bytesWritten int, err error) {
if c.expired {
return 0, errors.New("session is closed")
}
if c.session == nil {
c.core.router.doAdmin(func() {
c.startSearch()
})
return 0, errors.New("session not ready yet")
return 0, errors.New("searching for remote side")
}
defer util.PutBytes(b)
if !c.session.init {
@ -130,13 +138,15 @@ func (c *Conn) Write(b []byte) (bytesWritten int, err error) {
select {
case c.session.send <- packet:
case <-c.session.closed:
return len(b), errors.New("session closed")
c.expired = true
return len(b), errors.New("session is closed")
}
c.session.core.router.out(packet)
return len(b), nil
}
func (c *Conn) Close() error {
c.expired = true
c.session.close()
return nil
}

1
src/yggdrasil/session.go
View File

@ -368,7 +368,6 @@ func (ss *sessions) cleanup() {
// Closes a session, removing it from sessions maps and killing the worker goroutine.
func (sinfo *sessionInfo) close() {
sinfo.init = false
close(sinfo.closed)
delete(sinfo.core.sessions.sinfos, sinfo.myHandle)
delete(sinfo.core.sessions.byMySes, sinfo.mySesPub)