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p2p: reject messages that cannot be written as simple RLPx frames 

Until chunked frames are implemented we cannot send messages
with a size overflowing uint24.
This commit is contained in:
Felix Lange 2015-03-04 16:39:04 +01:00
parent 22659a7fea
commit 429828cd92
1 changed files with 5 additions and 0 deletions
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5
p2p/rlpx.go
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@ -19,6 +19,8 @@ var (
// sixteen zero bytes
zero16 = make([]byte, 16)
maxUint24 = ^uint32(0) >> 8
)
// rlpxFrameRW implements a simplified version of RLPx framing.
@ -64,6 +66,9 @@ func (rw *rlpxFrameRW) WriteMsg(msg Msg) error {
// write header
headbuf := make([]byte, 32)
fsize := uint32(len(ptype)) + msg.Size
if fsize > maxUint24 {
return errors.New("message size overflows uint24")
}
putInt24(fsize, headbuf) // TODO: check overflow
copy(headbuf[3:], zeroHeader)
rw.enc.XORKeyStream(headbuf[:16], headbuf[:16]) // first half is now encrypted