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Merge pull request #499 from yggdrasil-network/sessionfix

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Prevent session leaks or blocking if the listener is busy
This commit is contained in:
Neil Alexander 2019-08-13 08:27:30 +01:00 committed by GitHub
commit 5e7df5a1c4
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2 changed files with 27 additions and 25 deletions
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2
go.sum
View File

@ -22,6 +22,7 @@ github.com/yggdrasil-network/water v0.0.0-20190725073841-250edb919f8a h1:mQ0mPD+
github.com/yggdrasil-network/water v0.0.0-20190725073841-250edb919f8a/go.mod h1:R0SBCsugm+Sf1katgTb2t7GXMm+nRIv43tM4VDZbaOs=
github.com/yggdrasil-network/water v0.0.0-20190725123504-a16161896c34 h1:Qh5FE+Q5iGqpmR/FPMYHuoZLN921au/nxAlmKe+Hdbo=
github.com/yggdrasil-network/water v0.0.0-20190725123504-a16161896c34/go.mod h1:R0SBCsugm+Sf1katgTb2t7GXMm+nRIv43tM4VDZbaOs=
github.com/yggdrasil-network/water v0.0.0-20190812103929-c83fe40250f8 h1:YY9Pg2BEp0jeUVU60svTOaDr+fs1ySC9RbdC1Qc6wOw=
github.com/yggdrasil-network/water v0.0.0-20190812103929-c83fe40250f8/go.mod h1:R0SBCsugm+Sf1katgTb2t7GXMm+nRIv43tM4VDZbaOs=
golang.org/x/crypto v0.0.0-20181203042331-505ab145d0a9 h1:mKdxBk7AujPs8kU4m80U72y/zjbZ3UcXC7dClwKbUI0=
golang.org/x/crypto v0.0.0-20181203042331-505ab145d0a9/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
@ -45,6 +46,7 @@ golang.org/x/sys v0.0.0-20190712062909-fae7ac547cb7/go.mod h1:h1NjWce9XRLGQEsW7w
golang.org/x/sys v0.0.0-20190726091711-fc99dfbffb4e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20190801041406-cbf593c0f2f3 h1:4y9KwBHBgBNwDbtu44R5o1fdOCQUEXhbk/P4A9WmJq0=
golang.org/x/sys v0.0.0-20190801041406-cbf593c0f2f3/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20190812073006-9eafafc0a87e h1:TsjK5I7fXk8f2FQrgu6NS7i5Qih3knl2FL1htyguLRE=
golang.org/x/sys v0.0.0-20190812073006-9eafafc0a87e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=

50
src/yggdrasil/session.go
View File

@ -348,40 +348,40 @@ func (ss *sessions) sendPingPong(sinfo *sessionInfo, isPong bool) {
func (ss *sessions) handlePing(ping *sessionPing) {
// Get the corresponding session (or create a new session)
sinfo, isIn := ss.getByTheirPerm(&ping.SendPermPub)
// Check if the session is allowed
// TODO: this check may need to be moved
if !isIn && !ss.isSessionAllowed(&ping.SendPermPub, false) {
return
}
// Create the session if it doesn't already exist
if !isIn {
ss.createSession(&ping.SendPermPub)
sinfo, isIn = ss.getByTheirPerm(&ping.SendPermPub)
if !isIn {
panic("This should not happen")
}
switch {
case isIn: // Session already exists
case !ss.isSessionAllowed(&ping.SendPermPub, false): // Session is not allowed
case ping.IsPong: // This is a response, not an initial ping, so ignore it.
default:
ss.listenerMutex.Lock()
// Check and see if there's a Listener waiting to accept connections
// TODO: this should not block if nothing is accepting
if !ping.IsPong && ss.listener != nil {
if ss.listener != nil {
// This is a ping from an allowed node for which no session exists, and we have a listener ready to handle sessions.
// We need to create a session and pass it to the listener.
sinfo = ss.createSession(&ping.SendPermPub)
if s, _ := ss.getByTheirPerm(&ping.SendPermPub); s != sinfo {
panic("This should not happen")
}
conn := newConn(ss.core, crypto.GetNodeID(&sinfo.theirPermPub), &crypto.NodeID{}, sinfo)
for i := range conn.nodeMask {
conn.nodeMask[i] = 0xFF
}
conn.session.startWorkers()
ss.listener.conn <- conn
c := ss.listener.conn
go func() { c <- conn }()
}
ss.listenerMutex.Unlock()
}
sinfo.doFunc(func() {
// Update the session
if !sinfo.update(ping) { /*panic("Should not happen in testing")*/
return
}
if !ping.IsPong {
ss.sendPingPong(sinfo, true)
}
})
if sinfo != nil {
sinfo.doFunc(func() {
// Update the session
if !sinfo.update(ping) { /*panic("Should not happen in testing")*/
return
}
if !ping.IsPong {
ss.sendPingPong(sinfo, true)
}
})
}
}
// Get the MTU of the session.