[tor-commits] [torspec/master] VERSIONS cells sent after the initial VERSIONS cell are dropped

[nickm at torproject.org]

commit dd755cdc56cf85f8c86ea203e0cd0e7c59cfd86a
Author: teor <teor2345 at gmail.com>
Date:   Wed Sep 20 09:28:53 2017 +1000

    VERSIONS cells sent after the initial VERSIONS cell are dropped
    
    Resolves 22931.
---
 tor-spec.txt | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tor-spec.txt b/tor-spec.txt
index aab417b..291c964 100644
--- a/tor-spec.txt
+++ b/tor-spec.txt
@@ -556,6 +556,10 @@ see tor-design.pdf.
    close the connection if the versions cell is not well-formed (for example,
    if it contains an odd number of bytes).
 
+   Any VERSIONS cells sent after the first VERSIONS cell MUST be ignored.
+   (To be interpreted correctly, later VERSIONS cells MUST have a CIRCID_LEN
+   matching the version negotiated with the first VERSIONS cell.)
+
    Since the version 1 link protocol does not use the "renegotiation"
    handshake, implementations MUST NOT list version 1 in their VERSIONS
    cell.  When the "renegotiation" handshake is used, implementations