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Merge pull request #428 from Arceliar/readerror

Conn.Read don't return useless errors
This commit is contained in:
Arceliar 2019-05-31 17:56:53 -05:00 committed by GitHub
commit cab4b5f793
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@ -191,59 +191,64 @@ func (c *Conn) Read(b []byte) (int, error) {
return 0, errors.New("search failed")
}
}
// Wait for some traffic to come through from the session
select {
case <-timer.C:
return 0, ConnError{errors.New("timeout"), true, false, 0}
case p, ok := <-sinfo.recv:
// If the session is closed then do nothing
if !ok {
return 0, errors.New("session is closed")
}
defer util.PutBytes(p.Payload)
var err error
done := make(chan struct{})
workerFunc := func() {
defer close(done)
// If the nonce is bad then drop the packet and return an error
if !sinfo.nonceIsOK(&p.Nonce) {
err = ConnError{errors.New("packet dropped due to invalid nonce"), false, true, 0}
return
}
// Decrypt the packet
bs, isOK := crypto.BoxOpen(&sinfo.sharedSesKey, p.Payload, &p.Nonce)
defer util.PutBytes(bs) // FIXME commenting this out leads to illegal buffer reuse, this implies there's a memory error somewhere and that this is just flooding things out of the finite pool of old slices that get reused
// Check if we were unable to decrypt the packet for some reason and
// return an error if we couldn't
if !isOK {
err = errors.New("packet dropped due to decryption failure")
return
}
// Return the newly decrypted buffer back to the slice we were given
copy(b, bs)
// Trim the slice down to size based on the data we received
if len(bs) < len(b) {
b = b[:len(bs)]
}
// Update the session
sinfo.updateNonce(&p.Nonce)
sinfo.time = time.Now()
sinfo.bytesRecvd += uint64(len(b))
}
// Hand over to the session worker
select { // Send to worker
case sinfo.worker <- workerFunc:
for {
// Wait for some traffic to come through from the session
select {
case <-timer.C:
return 0, ConnError{errors.New("timeout"), true, false, 0}
case p, ok := <-sinfo.recv:
// If the session is closed then do nothing
if !ok {
return 0, errors.New("session is closed")
}
defer util.PutBytes(p.Payload)
var err error
done := make(chan struct{})
workerFunc := func() {
defer close(done)
// If the nonce is bad then drop the packet and return an error
if !sinfo.nonceIsOK(&p.Nonce) {
err = ConnError{errors.New("packet dropped due to invalid nonce"), false, true, 0}
return
}
// Decrypt the packet
bs, isOK := crypto.BoxOpen(&sinfo.sharedSesKey, p.Payload, &p.Nonce)
defer util.PutBytes(bs) // FIXME commenting this out leads to illegal buffer reuse, this implies there's a memory error somewhere and that this is just flooding things out of the finite pool of old slices that get reused
// Check if we were unable to decrypt the packet for some reason and
// return an error if we couldn't
if !isOK {
err = ConnError{errors.New("packet dropped due to decryption failure"), false, true, 0}
return
}
// Return the newly decrypted buffer back to the slice we were given
copy(b, bs)
// Trim the slice down to size based on the data we received
if len(bs) < len(b) {
b = b[:len(bs)]
}
// Update the session
sinfo.updateNonce(&p.Nonce)
sinfo.time = time.Now()
sinfo.bytesRecvd += uint64(len(b))
}
// Hand over to the session worker
select { // Send to worker
case sinfo.worker <- workerFunc:
case <-timer.C:
return 0, ConnError{errors.New("timeout"), true, false, 0}
}
<-done // Wait for the worker to finish, failing this can cause memory errors (util.[Get||Put]Bytes stuff)
// Something went wrong in the session worker so abort
if err != nil {
if ce, ok := err.(*ConnError); ok && ce.Temporary() {
continue
}
return 0, err
}
// If we've reached this point then everything went to plan, return the
// number of bytes we populated back into the given slice
return len(b), nil
}
<-done // Wait for the worker to finish, failing this can cause memory errors (util.[Get||Put]Bytes stuff)
// Something went wrong in the session worker so abort
if err != nil {
return 0, err
}
// If we've reached this point then everything went to plan, return the
// number of bytes we populated back into the given slice
return len(b), nil
}
}