yggdrasil-network/yggdrasil-go
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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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66
src/tuntap/conn.go
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@ -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 {
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
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)
}
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: