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| author | Felix Lange <fjl@twurst.com> | 2015-03-04 23:39:04 +0800 |
|---|---|---|
| committer | Felix Lange <fjl@twurst.com> | 2015-03-04 23:42:01 +0800 |
| commit | 429828cd9205a8db0024652fd9da96cfbdaeae86 (patch) | |
| tree | fac6621e110c9fdb038cf12e164ccf98e439295b /p2p/rlpx.go | |
| parent | 22659a7feaf4e939a33762c3f83b43d8bec757db (diff) | |
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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.
Diffstat (limited to 'p2p/rlpx.go')
| -rw-r--r-- | p2p/rlpx.go | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/p2p/rlpx.go b/p2p/rlpx.go index 166bbb5e6..6b533e275 100644 --- a/p2p/rlpx.go +++ b/p2p/rlpx.go @@ -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 |