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Move circuit-id-in-use check for CREATE cells to before all other checks

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This means that we never send a DESTROY cell in response to an attempt
to CREATE an existing circuit.  Fixes bug 12191.
This commit is contained in:
Nick Mathewson 2014-06-10 22:41:13 -04:00
parent 173a1afc58
commit af53e4bd1c
2 changed files with 23 additions and 17 deletions
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6
changes/bug12191 Normal file
View File

@ -0,0 +1,6 @@
o Minor bugfixes:
- We now drop CREATE cells for already-existent circuit IDs, regardless
of other factors that might otherwise have called for DESTROY cells.
Fixes bug 12191; bugfix on 0.2.???

34
src/or/command.c
View File

@ -227,6 +227,23 @@ command_process_create_cell(cell_t *cell, channel_t *chan)
(unsigned)cell->circ_id,
U64_PRINTF_ARG(chan->global_identifier), chan);
if (circuit_id_in_use_on_channel(cell->circ_id, chan)) {
const node_t *node = node_get_by_id(chan->identity_digest);
log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL,
"Received CREATE cell (circID %u) for known circ. "
"Dropping (age %d).",
(unsigned)cell->circ_id,
(int)(time(NULL) - channel_when_created(chan)));
if (node) {
char *p = esc_for_log(node_get_platform(node));
log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL,
"Details: router %s, platform %s.",
node_describe(node), p);
tor_free(p);
}
return;
}
if (we_are_hibernating()) {
log_info(LD_OR,
"Received create cell but we're shutting down. Sending back "
@ -274,23 +291,6 @@ command_process_create_cell(cell_t *cell, channel_t *chan)
return;
}
if (circuit_id_in_use_on_channel(cell->circ_id, chan)) {
const node_t *node = node_get_by_id(chan->identity_digest);
log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL,
"Received CREATE cell (circID %u) for known circ. "
"Dropping (age %d).",
(unsigned)cell->circ_id,
(int)(time(NULL) - channel_when_created(chan)));
if (node) {
char *p = esc_for_log(node_get_platform(node));
log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL,
"Details: router %s, platform %s.",
node_describe(node), p);
tor_free(p);
}
return;
}
circ = or_circuit_new(cell->circ_id, chan);
circ->base_.purpose = CIRCUIT_PURPOSE_OR;
circuit_set_state(TO_CIRCUIT(circ), CIRCUIT_STATE_ONIONSKIN_PENDING);