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Fix Conn.Read/Conn.Write behavior after Conn.Close, get rid of second TUN/TAP conn reader goroutine, no longer use deadlines

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This commit is contained in:
Neil Alexander 2019-07-17 21:42:17 +01:00
parent 1bf1c6eb36
commit 307b24d8cb
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GPG Key ID: A02A2019A2BB0944
3 changed files with 54 additions and 61 deletions
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58
src/tuntap/conn.go
View File

@ -43,7 +43,7 @@ func (s *tunConn) _close_nomutex() {
}()
}
func (s *tunConn) reader() error {
func (s *tunConn) reader() (err error) {
select {
case _, ok := <-s.stop:
if !ok {
@ -51,55 +51,29 @@ func (s *tunConn) reader() error {
}
default:
}
s.tun.log.Debugln("Starting conn reader for", s)
defer s.tun.log.Debugln("Stopping conn reader for", s)
s.tun.log.Debugln("Starting conn reader for", s.conn.String())
defer s.tun.log.Debugln("Stopping conn reader for", s.conn.String())
var n int
var err error
read := make(chan bool)
b := make([]byte, 65535)
go func() {
s.tun.log.Debugln("Starting conn reader helper for", s)
defer s.tun.log.Debugln("Stopping conn reader helper for", s)
for {
s.conn.SetReadDeadline(time.Now().Add(tunConnTimeout))
if n, err = s.conn.Read(b); err != nil {
s.tun.log.Errorln(s.conn.String(), "TUN/TAP conn read error:", err)
if e, eok := err.(yggdrasil.ConnError); eok {
s.tun.log.Debugln("Conn reader helper", s, "error:", e)
switch {
case e.Temporary():
fallthrough
case e.Timeout():
read <- false
continue
case e.Closed():
fallthrough
default:
s.close()
return
}
}
read <- false
}
read <- true
}
}()
for {
select {
case r, ok := <-read:
if r && n > 0 {
case <-s.stop:
return nil
default:
}
if n, err = s.conn.Read(b); err != nil {
if e, eok := err.(yggdrasil.ConnError); eok && !e.Temporary() {
s.tun.log.Errorln(s.conn.String(), "TUN/TAP conn read error:", err)
return e
}
} else if n > 0 {
bs := append(util.GetBytes(), b[:n]...)
select {
case s.tun.send <- bs:
default:
util.PutBytes(bs)
}
}
if ok {
s.stillAlive() // TODO? Only stay alive if we read >0 bytes?
}
case <-s.stop:
return nil
s.stillAlive()
}
}
}
@ -112,8 +86,8 @@ func (s *tunConn) writer() error {
}
default:
}
s.tun.log.Debugln("Starting conn writer for", s)
defer s.tun.log.Debugln("Stopping conn writer for", s)
s.tun.log.Debugln("Starting conn writer for", s.conn.String())
defer s.tun.log.Debugln("Stopping conn writer for", s.conn.String())
for {
select {
case <-s.stop:

42
src/yggdrasil/conn.go
View File

@ -49,7 +49,7 @@ type Conn struct {
nodeID *crypto.NodeID
nodeMask *crypto.NodeID
mutex sync.RWMutex
closed bool
close chan bool
session *sessionInfo
readDeadline atomic.Value // time.Time // TODO timer
writeDeadline atomic.Value // time.Time // TODO timer
@ -62,6 +62,7 @@ func newConn(core *Core, nodeID *crypto.NodeID, nodeMask *crypto.NodeID, session
nodeID: nodeID,
nodeMask: nodeMask,
session: session,
close: make(chan bool),
}
return &conn
}
@ -127,12 +128,14 @@ func (c *Conn) Read(b []byte) (int, error) {
for {
// Wait for some traffic to come through from the session
select {
case <-c.close:
return 0, ConnError{errors.New("session closed"), false, false, true, 0}
case <-timer.C:
return 0, ConnError{errors.New("timeout"), true, false, false, 0}
return 0, ConnError{errors.New("read timeout"), true, false, false, 0}
case p, ok := <-sinfo.recv:
// If the session is closed then do nothing
if !ok {
return 0, ConnError{errors.New("session is closed"), false, false, true, 0}
return 0, ConnError{errors.New("session closed"), false, false, true, 0}
}
defer util.PutBytes(p.Payload)
var err error
@ -167,16 +170,26 @@ func (c *Conn) Read(b []byte) (int, error) {
// Hand over to the session worker
defer func() {
if recover() != nil {
err = errors.New("read failed, session already closed")
err = ConnError{errors.New("read failed, session already closed"), false, false, true, 0}
close(done)
}
}() // In case we're racing with a close
select { // Send to worker
// Send to worker
select {
case sinfo.worker <- workerFunc:
case <-c.close:
return 0, ConnError{errors.New("session closed"), false, false, true, 0}
case <-timer.C:
return 0, ConnError{errors.New("timeout"), true, false, false, 0}
return 0, ConnError{errors.New("read timeout"), true, false, false, 0}
}
// Wait for the worker to finish
select {
case <-done: // Wait for the worker to finish, failing this can cause memory errors (util.[Get||Put]Bytes stuff)
case <-c.close:
return 0, ConnError{errors.New("session closed"), false, false, true, 0}
case <-timer.C:
return 0, ConnError{errors.New("read timeout"), true, false, false, 0}
}
<-done // Wait for the worker to finish, failing this can cause memory errors (util.[Get||Put]Bytes stuff)
// Something went wrong in the session worker so abort
if err != nil {
if ce, ok := err.(*ConnError); ok && ce.Temporary() {
@ -257,7 +270,7 @@ func (c *Conn) Write(b []byte) (bytesWritten int, err error) {
select { // Send to worker
case sinfo.worker <- workerFunc:
case <-timer.C:
return 0, ConnError{errors.New("timeout"), true, false, false, 0}
return 0, ConnError{errors.New("write timeout"), true, false, false, 0}
}
// Wait for the worker to finish, otherwise there are memory errors ([Get||Put]Bytes stuff)
<-done
@ -269,16 +282,21 @@ func (c *Conn) Write(b []byte) (bytesWritten int, err error) {
return written, err
}
func (c *Conn) Close() error {
func (c *Conn) Close() (err error) {
c.mutex.Lock()
defer c.mutex.Unlock()
if c.session != nil {
// Close the session, if it hasn't been closed already
c.core.router.doAdmin(c.session.close)
}
// This can't fail yet - TODO?
c.closed = true
return nil
func() {
defer func() {
recover()
err = ConnError{errors.New("close failed, session already closed"), false, false, true, 0}
}()
close(c.close) // Closes reader/writer goroutines
}()
return
}
func (c *Conn) LocalAddr() crypto.NodeID {

7
src/yggdrasil/debug.go
View File

@ -439,14 +439,14 @@ func (c *Core) DEBUG_maybeSendUDPKeys(saddr string) {
*/
////////////////////////////////////////////////////////////////////////////////
/*
func (c *Core) DEBUG_addPeer(addr string) {
err := c.admin.addPeer(addr, "")
if err != nil {
panic(err)
}
}
*/
/*
func (c *Core) DEBUG_addSOCKSConn(socksaddr, peeraddr string) {
go func() {
@ -541,13 +541,14 @@ func (c *Core) DEBUG_setIfceExpr(expr *regexp.Regexp) {
c.log.Println("DEBUG_setIfceExpr no longer implemented")
}
/*
func (c *Core) DEBUG_addAllowedEncryptionPublicKey(boxStr string) {
err := c.admin.addAllowedEncryptionPublicKey(boxStr)
if err != nil {
panic(err)
}
}
*/
////////////////////////////////////////////////////////////////////////////////
func DEBUG_simLinkPeers(p, q *peer) {