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Fix some obvious concurrency bugs

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This commit is contained in:
Neil Alexander 2019-03-04 18:47:40 +00:00
parent 82bb95b77f
commit eeede4e6d0
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GPG Key ID: A02A2019A2BB0944
1 changed files with 17 additions and 11 deletions
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28
src/yggdrasil/tcp.go
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@ -63,9 +63,14 @@ func (t *tcp) setExtraOptions(c net.Conn) {
// Returns the address of the listener.
func (t *tcp) getAddr() *net.TCPAddr {
// TODO: Fix this, because this will currently only give a single address
// to multicast.go, which obviously is not great, but right now multicast.go
// doesn't have the ability to send more than one address in a packet either
t.mutex.Lock()
for _, listener := range t.listeners {
return listener.Addr().(*net.TCPAddr)
}
t.mutex.Unlock()
return nil
}
@ -83,6 +88,12 @@ func (t *tcp) connectSOCKS(socksaddr, peeraddr string) {
func (t *tcp) init(l *link) error {
t.link = l
t.reconfigure = make(chan chan error, 1)
t.mutex.Lock()
t.calls = make(map[string]struct{})
t.conns = make(map[tcpInfo](chan struct{}))
t.listeners = make(map[string]net.Listener)
t.listenerstops = make(map[string]chan bool)
t.mutex.Unlock()
go func() {
for {
@ -90,9 +101,8 @@ func (t *tcp) init(l *link) error {
t.link.core.configMutex.RLock()
added := util.Difference(t.link.core.config.Listen, t.link.core.configOld.Listen)
deleted := util.Difference(t.link.core.configOld.Listen, t.link.core.config.Listen)
updated := len(added) > 0 || len(deleted) > 0
t.link.core.configMutex.RUnlock()
if updated {
if len(added) > 0 || len(deleted) > 0 {
for _, add := range added {
if add[:6] != "tcp://" {
continue
@ -120,13 +130,6 @@ func (t *tcp) init(l *link) error {
}
}()
t.mutex.Lock()
t.calls = make(map[string]struct{})
t.conns = make(map[tcpInfo](chan struct{}))
t.listeners = make(map[string]net.Listener)
t.listenerstops = make(map[string]chan bool)
t.mutex.Unlock()
t.link.core.configMutex.RLock()
defer t.link.core.configMutex.RUnlock()
for _, listenaddr := range t.link.core.config.Listen {
@ -163,8 +166,11 @@ func (t *tcp) listen(listenaddr string) error {
// Runs the listener, which spawns off goroutines for incoming connections.
func (t *tcp) listener(listenaddr string) {
t.mutex.Lock()
listener, ok := t.listeners[listenaddr]
if !ok {
listenerstop, ok2 := t.listenerstops[listenaddr]
t.mutex.Unlock()
if !ok || !ok2 {
t.link.core.log.Errorln("Tried to start TCP listener for", listenaddr, "which doesn't exist")
return
}
@ -185,7 +191,7 @@ func (t *tcp) listener(listenaddr string) {
t.link.core.log.Errorln("Failed to accept connection:", err)
return
}
case <-t.listenerstops[listenaddr]:
case <-listenerstop:
t.link.core.log.Errorln("Stopping TCP listener on:", reallistenaddr)
return
default: