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possibly mitigate livelock bug where lossy links lead to constant connect/disconnect cycles due to disagreement about which of the two duplicate autoconnection attempts to use

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This commit is contained in:
Arceliar 2018-06-16 15:31:25 -05:00
parent 21b15c97a9
commit 496dc94f02
1 changed files with 6 additions and 3 deletions
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9
src/yggdrasil/tcp.go
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@ -26,6 +26,7 @@ import (
)
const tcp_msgSize = 2048 + 65535 // TODO figure out what makes sense
const tcp_timeout = 6 * time.Second
// Wrapper function for non tcp/ip connections.
func setNoDelay(c net.Conn, delay bool) {
@ -109,6 +110,8 @@ func (iface *tcpInterface) call(saddr string, socksaddr *string) {
} else {
iface.calls[saddr] = struct{}{}
defer func() {
// Block new calls for a little while, to mitigate livelock scenarios
time.Sleep(tcp_timeout)
iface.mutex.Lock()
delete(iface.calls, saddr)
iface.mutex.Unlock()
@ -162,7 +165,7 @@ func (iface *tcpInterface) handler(sock net.Conn, incoming bool) {
if err != nil {
return
}
timeout := time.Now().Add(6 * time.Second)
timeout := time.Now().Add(tcp_timeout)
sock.SetReadDeadline(timeout)
_, err = sock.Read(metaBytes)
if err != nil {
@ -257,7 +260,7 @@ func (iface *tcpInterface) handler(sock net.Conn, incoming bool) {
atomic.AddUint64(&p.bytesSent, uint64(len(tcp_msg)+len(msgLen)+len(msg)))
util_putBytes(msg)
}
timerInterval := 4 * time.Second
timerInterval := tcp_timeout * 2 / 3
timer := time.NewTimer(timerInterval)
defer timer.Stop()
for {
@ -334,7 +337,7 @@ func (iface *tcpInterface) reader(sock net.Conn, in func([]byte)) {
bs := make([]byte, 2*tcp_msgSize)
frag := bs[:0]
for {
timeout := time.Now().Add(6 * time.Second)
timeout := time.Now().Add(tcp_timeout)
sock.SetReadDeadline(timeout)
n, err := sock.Read(bs[len(frag):])
if err != nil || n == 0 {