What cells can be sent before a VERSIONS cell, and what is their CIRCID_LEN?

Closed (moved) Issue created 7 years ago by teor

tor-spec.txt says:

   CIRCID_LEN is 2 for link protocol versions 1, 2, and 3.  CIRCID_LEN
   is 4 for link protocol version 4 or higher.  The VERSIONS cell itself
   always has CIRCID_LEN == 2 for backward compatibility.

But what is the CIRCID_LEN for early VPADDING, AUTHORIZE, or PADDING cells?

   When this handshake is in use, the first cell must
   be VERSIONS, VPADDING or AUTHORIZE, and no other cell type is allowed to
   intervene besides those specified, except for PADDING and VPADDING cells.

Is it valid to send VPADDING, then PADDING, then VERSIONS? If so, what is their CIRCID_LEN? Which sentence prevails, the one above, or the one below?

   Parties MUST NOT send any
   other cells on a connection until they have received a VERSIONS cell.

What cells can be sent before a VERSIONS cell, and what is their CIRCID_LEN?

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