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refactor session worker code slightly

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This commit is contained in:
Arceliar 2019-08-03 23:14:51 -05:00
parent 7a9ad0c8cc
commit befd1b43a0
1 changed files with 67 additions and 61 deletions
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128
src/yggdrasil/session.go
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@ -442,50 +442,53 @@ func (sinfo *sessionInfo) recvWorker() {
// Since there's no reason for anywhere else in the session code to need to *read* it...
// Only needs to be updated from the outside if a ping resets it...
// That would get rid of the need to take a mutex for the sessionFunc
doRecv := func(p *wire_trafficPacket) {
var bs []byte
var err error
var k crypto.BoxSharedKey
sessionFunc := func() {
if !sinfo.nonceIsOK(&p.Nonce) {
err = ConnError{errors.New("packet dropped due to invalid nonce"), false, true, false, 0}
return
}
k = sinfo.sharedSesKey
}
sinfo.doFunc(sessionFunc)
if err != nil {
util.PutBytes(p.Payload)
return
}
var isOK bool
bs, isOK = crypto.BoxOpen(&k, p.Payload, &p.Nonce)
if !isOK {
util.PutBytes(bs)
return
}
sessionFunc = func() {
if k != sinfo.sharedSesKey || !sinfo.nonceIsOK(&p.Nonce) {
// The session updated in the mean time, so return an error
err = ConnError{errors.New("session updated during crypto operation"), false, true, false, 0}
return
}
sinfo.updateNonce(&p.Nonce)
sinfo.time = time.Now()
sinfo.bytesRecvd += uint64(len(bs))
}
sinfo.doFunc(sessionFunc)
if err != nil {
// Not sure what else to do with this packet, I guess just drop it
util.PutBytes(bs)
} else {
// Pass the packet to the buffer for Conn.Read
sinfo.recv <- bs
}
}
for {
select {
case <-sinfo.cancel.Finished():
return
case p := <-sinfo.fromRouter:
var bs []byte
var err error
var k crypto.BoxSharedKey
sessionFunc := func() {
if !sinfo.nonceIsOK(&p.Nonce) {
err = ConnError{errors.New("packet dropped due to invalid nonce"), false, true, false, 0}
return
}
k = sinfo.sharedSesKey
}
sinfo.doFunc(sessionFunc)
if err != nil {
util.PutBytes(p.Payload)
continue
}
var isOK bool
bs, isOK = crypto.BoxOpen(&k, p.Payload, &p.Nonce)
if !isOK {
util.PutBytes(bs)
continue
}
sessionFunc = func() {
if k != sinfo.sharedSesKey || !sinfo.nonceIsOK(&p.Nonce) {
// The session updated in the mean time, so return an error
err = ConnError{errors.New("session updated during crypto operation"), false, true, false, 0}
return
}
sinfo.updateNonce(&p.Nonce)
sinfo.time = time.Now()
sinfo.bytesRecvd += uint64(len(bs))
}
sinfo.doFunc(sessionFunc)
if err != nil {
// Not sure what else to do with this packet, I guess just drop it
util.PutBytes(bs)
} else {
// Pass the packet to the buffer for Conn.Read
sinfo.recv <- bs
}
doRecv(p)
}
}
}
@ -493,33 +496,36 @@ func (sinfo *sessionInfo) recvWorker() {
func (sinfo *sessionInfo) sendWorker() {
// TODO move info that this worker needs here, send updates via a channel
// Otherwise we need to take a mutex to avoid races with update()
doSend := func(bs []byte) {
var p wire_trafficPacket
var k crypto.BoxSharedKey
sessionFunc := func() {
sinfo.bytesSent += uint64(len(bs))
p = wire_trafficPacket{
Coords: append([]byte(nil), sinfo.coords...),
Handle: sinfo.theirHandle,
Nonce: sinfo.myNonce,
}
sinfo.myNonce.Increment()
k = sinfo.sharedSesKey
}
// Get the mutex-protected info needed to encrypt the packet
sinfo.doFunc(sessionFunc)
// Encrypt the packet
p.Payload, _ = crypto.BoxSeal(&k, bs, &p.Nonce)
packet := p.encode()
// Cleanup
util.PutBytes(bs)
util.PutBytes(p.Payload)
// Send the packet
sinfo.core.router.out(packet)
}
for {
select {
case <-sinfo.cancel.Finished():
return
case bs := <-sinfo.send:
var p wire_trafficPacket
var k crypto.BoxSharedKey
sessionFunc := func() {
sinfo.bytesSent += uint64(len(bs))
p = wire_trafficPacket{
Coords: append([]byte(nil), sinfo.coords...),
Handle: sinfo.theirHandle,
Nonce: sinfo.myNonce,
}
sinfo.myNonce.Increment()
k = sinfo.sharedSesKey
}
// Get the mutex-protected info needed to encrypt the packet
sinfo.doFunc(sessionFunc)
// Encrypt the packet
p.Payload, _ = crypto.BoxSeal(&k, bs, &p.Nonce)
packet := p.encode()
// Cleanup
util.PutBytes(bs)
util.PutBytes(p.Payload)
// Send the packet
sinfo.core.router.out(packet)
doSend(bs)
}
}
}