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hs: Update intro circuit timestamp when re-extending

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A client can re-extend up to 3 intro points on the same circuit. This happens
when we get NACKed by the intro point for which we choose a new intro and
re-extend the circuit to it.

That process can be arbitrarly long so reset the dirty timestamp of the
circuit everytime we choose to re-extend so we get a bit more time to actually
do our introduction.

This is a client circuit so it is short live once opened thus giving us a bit
more time to complete the introduction is ok.

Signed-off-by: David Goulet <dgoulet@torproject.org>
This commit is contained in:
David Goulet 2017-08-24 09:12:57 -04:00
parent 1077e9894c
commit a112562544
1 changed files with 7 additions and 0 deletions
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7
src/or/hs_client.c
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@ -1195,6 +1195,13 @@ hs_client_reextend_intro_circuit(origin_circuit_t *circ)
(unsigned int) TO_CIRCUIT(circ)->n_circ_id,
safe_str_client(extend_info_describe(ei)));
ret = circuit_extend_to_new_exit(circ, ei);
if (ret == 0) {
/* We were able to extend so update the timestamp so we avoid expiring
* this circuit too early. The intro circuit is short live so the
* linkability issue is minimized, we just need the circuit to hold a
* bit longer so we can introduce. */
TO_CIRCUIT(circ)->timestamp_dirty = time(NULL);
}
} else {
log_info(LD_REND, "Closing intro circ %u (out of RELAY_EARLY cells).",
(unsigned int) TO_CIRCUIT(circ)->n_circ_id);