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sendme: Add helper to note the cell digest

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Signed-off-by: David Goulet <dgoulet@torproject.org>
This commit is contained in:
David Goulet 2019-04-24 11:57:20 -04:00
parent 7c8e519b34
commit 805c81efed
2 changed files with 29 additions and 0 deletions
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27
src/core/or/sendme.c
View File

@ -286,10 +286,37 @@ send_circuit_level_sendme(circuit_t *circ, crypt_path_t *layer_hint,
return 0;
}
/* Put the crypto.b_digest in the sendme_digest. */
static void
note_cell_digest(const relay_crypto_t *crypto)
{
tor_assert(crypto);
crypto_digest_get_digest(crypto->b_digest, (char *) crypto->sendme_digest,
sizeof(crypto->sendme_digest));
}
/*
* Public API
*/
/** Keep the current inbound cell digest for the next SENDME digest. This part
* is only done by the client as the circuit came back from the Exit. */
void
sendme_circuit_note_outbound_cell(or_circuit_t *or_circ)
{
tor_assert(or_circ);
note_cell_digest(&or_circ->crypto);
}
/** Keep the current inbound cell digest for the next SENDME digest. This part
* is only done by the client as the circuit came back from the Exit. */
void
sendme_circuit_note_inbound_cell(crypt_path_t *cpath)
{
tor_assert(cpath);
note_cell_digest(&cpath->crypto);
}
/** Return true iff the next cell for the given cell window is expected to be
* a SENDME.
*

2
src/core/or/sendme.h
View File

@ -36,6 +36,8 @@ int sendme_note_stream_data_packaged(edge_connection_t *conn);
/* Track cell digest. */
void sendme_note_cell_digest(circuit_t *circ);
void sendme_circuit_note_inbound_cell(crypt_path_t *cpath);
void sendme_circuit_note_outbound_cell(or_circuit_t *or_circ);
/* Circuit level information. */
bool sendme_circuit_is_next_cell(int window);