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better comments and mild refactoring

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This commit is contained in:
Roger Dingledine 2017-07-03 17:13:08 -04:00
parent 9b44e2e50e
commit 69fba1f2cd
1 changed files with 30 additions and 22 deletions
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52
src/or/circuitbuild.c
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@ -916,30 +916,35 @@ circuit_purpose_may_omit_guard(int purpose)
* If circ's first hop is closed, then we need to build a create
* cell and send it forward.
*
* Otherwise, we need to build a relay extend cell and send it
* forward.
* Otherwise, if circ's cpath still has any non-open hops, we need to
* build a relay extend cell and send it forward to the next non-open hop.
*
* If all hops on the cpath are open, we're done building the circuit
* and we should do housekeeping for the newly opened circuit.
*
* Return -reason if we want to tear down circ, else return 0.
*/
int
circuit_send_next_onion_skin(origin_circuit_t *circ)
{
tor_assert(circ);
if (circ->cpath->state == CPATH_STATE_CLOSED) {
/* Case one: we're on the first hop. */
return circuit_send_first_onion_skin(circ);
} else {
tor_assert(circ->cpath->state == CPATH_STATE_OPEN);
tor_assert(circ->base_.state == CIRCUIT_STATE_BUILDING);
log_debug(LD_CIRC,"starting to send subsequent skin.");
crypt_path_t *hop = onion_next_hop_in_cpath(circ->cpath);
if (!hop) {
return circuit_build_no_more_hops(circ);
} else {
return circuit_send_intermediate_onion_skin(circ, hop);
}
}
tor_assert(circ->cpath->state == CPATH_STATE_OPEN);
tor_assert(circ->base_.state == CIRCUIT_STATE_BUILDING);
crypt_path_t *hop = onion_next_hop_in_cpath(circ->cpath);
if (hop) {
/* Case two: we're on a hop after the first. */
return circuit_send_intermediate_onion_skin(circ, hop);
}
/* Case three: the circuit is finished. Do housekeeping tasks on it. */
return circuit_build_no_more_hops(circ);
}
/**
@ -951,16 +956,17 @@ circuit_send_next_onion_skin(origin_circuit_t *circ)
static int
circuit_send_first_onion_skin(origin_circuit_t *circ)
{
const node_t *node;
/* This is the first hop. */
create_cell_t cc;
int fast;
int len;
log_debug(LD_CIRC,"First skin; sending create cell.");
const node_t *node;
create_cell_t cc;
memset(&cc, 0, sizeof(cc));
if (circ->build_state->onehop_tunnel)
log_debug(LD_CIRC,"First skin; sending create cell.");
if (circ->build_state->onehop_tunnel) {
control_event_bootstrap(BOOTSTRAP_STATUS_ONEHOP_CREATE, 0);
else {
} else {
control_event_bootstrap(BOOTSTRAP_STATUS_CIRCUIT_CREATE, 0);
/* If this is not a one-hop tunnel, the channel is being used
@ -1018,7 +1024,6 @@ circuit_send_first_onion_skin(origin_circuit_t *circ)
static int
circuit_build_no_more_hops(origin_circuit_t *circ)
{
/* done building the circuit. whew. */
guard_usable_t r;
if (! circ->guard_state) {
if (circuit_get_cpath_len(circ) != 1 &&
@ -1131,9 +1136,12 @@ static int
circuit_send_intermediate_onion_skin(origin_circuit_t *circ,
crypt_path_t *hop)
{
extend_cell_t ec;
int len;
extend_cell_t ec;
memset(&ec, 0, sizeof(ec));
log_debug(LD_CIRC,"starting to send subsequent skin.");
if (tor_addr_family(&hop->extend_info->addr) != AF_INET) {
log_warn(LD_BUG, "Trying to extend to a non-IPv4 address.");
return - END_CIRC_REASON_INTERNAL;
@ -1172,7 +1180,7 @@ circuit_send_intermediate_onion_skin(origin_circuit_t *circ,
return -END_CIRC_REASON_INTERNAL;
}
/* send it to hop->prev, because it will transfer
/* send it to hop->prev, because that relay will transfer
* it to a create cell and then send to hop */
if (relay_send_command_from_edge(0, TO_CIRCUIT(circ),
command,