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Make entry_guard_t opaque to circpathbias.c

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This was a relatively mechanical change.  First, I added an accessor
function for the pathbias-state field of a guard.  Then I did a
search-and-replace in circpathbias.c to replace "guard->pb." with
"pb->".  Finally, I made sure that "pb" was declared whenever it was
needed.
This commit is contained in:
Nick Mathewson 2016-11-14 12:57:05 -05:00
parent 62477906e9
commit f66f9c82e9
3 changed files with 143 additions and 116 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

249
src/or/circpathbias.c
View File

@ -21,9 +21,6 @@
* each guard, and stored persistently in the state file.
*/
/* XXXX prop271 I would like to remove this. */
#define ENTRYNODES_EXPOSE_STRUCT
#include "or.h"
#include "channel.h"
#include "circpathbias.h"
@ -54,18 +51,20 @@ static int entry_guard_inc_circ_attempt_count(entry_guard_t *guard);
static int
entry_guard_inc_circ_attempt_count(entry_guard_t *guard)
{
guard_pathbias_t *pb = entry_guard_get_pathbias_state(guard);
entry_guards_changed();
pathbias_measure_close_rate(guard);
if (guard->pb.path_bias_disabled)
if (pb->path_bias_disabled)
return -1;
pathbias_scale_close_rates(guard);
guard->pb.circ_attempts++;
pb->circ_attempts++;
log_info(LD_CIRC, "Got success count %f/%f for guard %s",
guard->pb.circ_successes, guard->pb.circ_attempts,
pb->circ_successes, pb->circ_attempts,
entry_guard_describe(guard));
return 0;
}
@ -516,13 +515,15 @@ pathbias_count_build_success(origin_circuit_t *circ)
}
if (guard) {
guard_pathbias_t *pb = entry_guard_get_pathbias_state(guard);
if (circ->path_state == PATH_STATE_BUILD_ATTEMPTED) {
circ->path_state = PATH_STATE_BUILD_SUCCEEDED;
guard->pb.circ_successes++;
pb->circ_successes++;
entry_guards_changed();
log_info(LD_CIRC, "Got success count %f/%f for guard %s",
guard->pb.circ_successes, guard->pb.circ_attempts,
pb->circ_successes, pb->circ_attempts,
entry_guard_describe(guard));
} else {
if ((rate_msg = rate_limit_log(&success_notice_limit,
@ -538,10 +539,10 @@ pathbias_count_build_success(origin_circuit_t *circ)
}
}
if (guard->pb.circ_attempts < guard->pb.circ_successes) {
if (pb->circ_attempts < pb->circ_successes) {
log_notice(LD_BUG, "Unexpectedly high successes counts (%f/%f) "
"for guard %s",
guard->pb.circ_successes, guard->pb.circ_attempts,
pb->circ_successes, pb->circ_attempts,
entry_guard_describe(guard));
}
/* In rare cases, CIRCUIT_PURPOSE_TESTING can get converted to
@ -585,8 +586,6 @@ pathbias_count_build_success(origin_circuit_t *circ)
void
pathbias_count_use_attempt(origin_circuit_t *circ)
{
entry_guard_t *guard;
if (!pathbias_should_count(circ)) {
return;
}
@ -599,18 +598,20 @@ pathbias_count_use_attempt(origin_circuit_t *circ)
circuit_purpose_to_string(circ->base_.purpose),
circuit_state_to_string(circ->base_.state));
} else if (circ->path_state < PATH_STATE_USE_ATTEMPTED) {
guard = entry_guard_get_by_id_digest(
entry_guard_t *guard = entry_guard_get_by_id_digest(
circ->cpath->extend_info->identity_digest);
if (guard) {
guard_pathbias_t *pb = entry_guard_get_pathbias_state(guard);
pathbias_measure_use_rate(guard);
pathbias_scale_use_rates(guard);
guard->pb.use_attempts++;
pb->use_attempts++;
entry_guards_changed();
log_debug(LD_CIRC,
"Marked circuit %d (%f/%f) as used for guard %s.",
circ->global_identifier,
guard->pb.use_successes, guard->pb.use_attempts,
pb->use_successes, pb->use_attempts,
entry_guard_describe(guard));
}
@ -713,20 +714,22 @@ pathbias_count_use_success(origin_circuit_t *circ)
guard = entry_guard_get_by_id_digest(
circ->cpath->extend_info->identity_digest);
if (guard) {
guard->pb.use_successes++;
guard_pathbias_t *pb = entry_guard_get_pathbias_state(guard);
pb->use_successes++;
entry_guards_changed();
if (guard->pb.use_attempts < guard->pb.use_successes) {
if (pb->use_attempts < pb->use_successes) {
log_notice(LD_BUG, "Unexpectedly high use successes counts (%f/%f) "
"for guard %s",
guard->pb.use_successes, guard->pb.use_attempts,
pb->use_successes, pb->use_attempts,
entry_guard_describe(guard));
}
log_debug(LD_CIRC,
"Marked circuit %d (%f/%f) as used successfully for guard %s",
circ->global_identifier, guard->pb.use_successes,
guard->pb.use_attempts,
circ->global_identifier, pb->use_successes,
pb->use_attempts,
entry_guard_describe(guard));
}
}
@ -1028,9 +1031,11 @@ pathbias_count_successful_close(origin_circuit_t *circ)
}
if (guard) {
guard_pathbias_t *pb = entry_guard_get_pathbias_state(guard);
/* In the long run: circuit_success ~= successful_circuit_close +
* circ_failure + stream_failure */
guard->pb.successful_circuits_closed++;
pb->successful_circuits_closed++;
entry_guards_changed();
} else if (circ->base_.purpose != CIRCUIT_PURPOSE_C_MEASURE_TIMEOUT) {
/* In rare cases, CIRCUIT_PURPOSE_TESTING can get converted to
@ -1067,7 +1072,9 @@ pathbias_count_collapse(origin_circuit_t *circ)
}
if (guard) {
guard->pb.collapsed_circuits++;
guard_pathbias_t *pb = entry_guard_get_pathbias_state(guard);
pb->collapsed_circuits++;
entry_guards_changed();
} else if (circ->base_.purpose != CIRCUIT_PURPOSE_C_MEASURE_TIMEOUT) {
/* In rare cases, CIRCUIT_PURPOSE_TESTING can get converted to
@ -1100,7 +1107,9 @@ pathbias_count_use_failed(origin_circuit_t *circ)
}
if (guard) {
guard->pb.unusable_circuits++;
guard_pathbias_t *pb = entry_guard_get_pathbias_state(guard);
pb->unusable_circuits++;
entry_guards_changed();
} else if (circ->base_.purpose != CIRCUIT_PURPOSE_C_MEASURE_TIMEOUT) {
/* In rare cases, CIRCUIT_PURPOSE_TESTING can get converted to
@ -1143,7 +1152,9 @@ pathbias_count_timeout(origin_circuit_t *circ)
}
if (guard) {
guard->pb.timeouts++;
guard_pathbias_t *pb = entry_guard_get_pathbias_state(guard);
pb->timeouts++;
entry_guards_changed();
}
}
@ -1199,7 +1210,9 @@ pathbias_count_circs_in_states(entry_guard_t *guard,
double
pathbias_get_close_success_count(entry_guard_t *guard)
{
return guard->pb.successful_circuits_closed +
guard_pathbias_t *pb = entry_guard_get_pathbias_state(guard);
return pb->successful_circuits_closed +
pathbias_count_circs_in_states(guard,
PATH_STATE_BUILD_SUCCEEDED,
PATH_STATE_USE_SUCCEEDED);
@ -1215,7 +1228,9 @@ pathbias_get_close_success_count(entry_guard_t *guard)
double
pathbias_get_use_success_count(entry_guard_t *guard)
{
return guard->pb.use_successes +
guard_pathbias_t *pb = entry_guard_get_pathbias_state(guard);
return pb->use_successes +
pathbias_count_circs_in_states(guard,
PATH_STATE_USE_ATTEMPTED,
PATH_STATE_USE_SUCCEEDED);
@ -1233,16 +1248,17 @@ static void
pathbias_measure_use_rate(entry_guard_t *guard)
{
const or_options_t *options = get_options();
guard_pathbias_t *pb = entry_guard_get_pathbias_state(guard);
if (guard->pb.use_attempts > pathbias_get_min_use(options)) {
if (pb->use_attempts > pathbias_get_min_use(options)) {
/* Note: We rely on the < comparison here to allow us to set a 0
* rate and disable the feature entirely. If refactoring, don't
* change to <= */
if (pathbias_get_use_success_count(guard)/guard->pb.use_attempts
if (pathbias_get_use_success_count(guard)/pb->use_attempts
< pathbias_get_extreme_use_rate(options)) {
/* Dropping is currently disabled by default. */
if (pathbias_get_dropguards(options)) {
if (!guard->pb.path_bias_disabled) {
if (!pb->path_bias_disabled) {
log_warn(LD_CIRC,
"Your Guard %s is failing to carry an extremely large "
"amount of stream on its circuits. "
@ -1254,20 +1270,20 @@ pathbias_measure_use_rate(entry_guard_t *guard)
"For reference, your timeout cutoff is %ld seconds.",
entry_guard_describe(guard),
tor_lround(pathbias_get_use_success_count(guard)),
tor_lround(guard->pb.use_attempts),
tor_lround(pb->use_attempts),
tor_lround(pathbias_get_close_success_count(guard)),
tor_lround(guard->pb.circ_attempts),
tor_lround(guard->pb.circ_successes),
tor_lround(guard->pb.unusable_circuits),
tor_lround(guard->pb.collapsed_circuits),
tor_lround(guard->pb.timeouts),
tor_lround(pb->circ_attempts),
tor_lround(pb->circ_successes),
tor_lround(pb->unusable_circuits),
tor_lround(pb->collapsed_circuits),
tor_lround(pb->timeouts),
tor_lround(get_circuit_build_close_time_ms()/1000));
guard->pb.path_bias_disabled = 1;
pb->path_bias_disabled = 1;
entry_guard_mark_bad(guard);
return;
}
} else if (!guard->pb.path_bias_use_extreme) {
guard->pb.path_bias_use_extreme = 1;
} else if (!pb->path_bias_use_extreme) {
pb->path_bias_use_extreme = 1;
log_warn(LD_CIRC,
"Your Guard %s is failing to carry an extremely large "
"amount of streams on its circuits. "
@ -1279,19 +1295,19 @@ pathbias_measure_use_rate(entry_guard_t *guard)
"For reference, your timeout cutoff is %ld seconds.",
entry_guard_describe(guard),
tor_lround(pathbias_get_use_success_count(guard)),
tor_lround(guard->pb.use_attempts),
tor_lround(pb->use_attempts),
tor_lround(pathbias_get_close_success_count(guard)),
tor_lround(guard->pb.circ_attempts),
tor_lround(guard->pb.circ_successes),
tor_lround(guard->pb.unusable_circuits),
tor_lround(guard->pb.collapsed_circuits),
tor_lround(guard->pb.timeouts),
tor_lround(pb->circ_attempts),
tor_lround(pb->circ_successes),
tor_lround(pb->unusable_circuits),
tor_lround(pb->collapsed_circuits),
tor_lround(pb->timeouts),
tor_lround(get_circuit_build_close_time_ms()/1000));
}
} else if (pathbias_get_use_success_count(guard)/guard->pb.use_attempts
} else if (pathbias_get_use_success_count(guard)/pb->use_attempts
< pathbias_get_notice_use_rate(options)) {
if (!guard->pb.path_bias_use_noticed) {
guard->pb.path_bias_use_noticed = 1;
if (!pb->path_bias_use_noticed) {
pb->path_bias_use_noticed = 1;
log_notice(LD_CIRC,
"Your Guard %s is failing to carry more streams on its "
"circuits than usual. "
@ -1303,13 +1319,13 @@ pathbias_measure_use_rate(entry_guard_t *guard)
"For reference, your timeout cutoff is %ld seconds.",
entry_guard_describe(guard),
tor_lround(pathbias_get_use_success_count(guard)),
tor_lround(guard->pb.use_attempts),
tor_lround(pb->use_attempts),
tor_lround(pathbias_get_close_success_count(guard)),
tor_lround(guard->pb.circ_attempts),
tor_lround(guard->pb.circ_successes),
tor_lround(guard->pb.unusable_circuits),
tor_lround(guard->pb.collapsed_circuits),
tor_lround(guard->pb.timeouts),
tor_lround(pb->circ_attempts),
tor_lround(pb->circ_successes),
tor_lround(pb->unusable_circuits),
tor_lround(pb->collapsed_circuits),
tor_lround(pb->timeouts),
tor_lround(get_circuit_build_close_time_ms()/1000));
}
}
@ -1338,16 +1354,17 @@ static void
pathbias_measure_close_rate(entry_guard_t *guard)
{
const or_options_t *options = get_options();
if (guard->pb.circ_attempts > pathbias_get_min_circs(options)) {
guard_pathbias_t *pb = entry_guard_get_pathbias_state(guard);
if (pb->circ_attempts > pathbias_get_min_circs(options)) {
/* Note: We rely on the < comparison here to allow us to set a 0
* rate and disable the feature entirely. If refactoring, don't
* change to <= */
if (pathbias_get_close_success_count(guard)/guard->pb.circ_attempts
if (pathbias_get_close_success_count(guard)/pb->circ_attempts
< pathbias_get_extreme_rate(options)) {
/* Dropping is currently disabled by default. */
if (pathbias_get_dropguards(options)) {
if (!guard->pb.path_bias_disabled) {
if (!pb->path_bias_disabled) {
log_warn(LD_CIRC,
"Your Guard %s is failing an extremely large "
"amount of circuits. "
@ -1359,20 +1376,20 @@ pathbias_measure_close_rate(entry_guard_t *guard)
"For reference, your timeout cutoff is %ld seconds.",
entry_guard_describe(guard),
tor_lround(pathbias_get_close_success_count(guard)),
tor_lround(guard->pb.circ_attempts),
tor_lround(pb->circ_attempts),
tor_lround(pathbias_get_use_success_count(guard)),
tor_lround(guard->pb.use_attempts),
tor_lround(guard->pb.circ_successes),
tor_lround(guard->pb.unusable_circuits),
tor_lround(guard->pb.collapsed_circuits),
tor_lround(guard->pb.timeouts),
tor_lround(pb->use_attempts),
tor_lround(pb->circ_successes),
tor_lround(pb->unusable_circuits),
tor_lround(pb->collapsed_circuits),
tor_lround(pb->timeouts),
tor_lround(get_circuit_build_close_time_ms()/1000));
guard->pb.path_bias_disabled = 1;
pb->path_bias_disabled = 1;
entry_guard_mark_bad(guard);
return;
}
} else if (!guard->pb.path_bias_extreme) {
guard->pb.path_bias_extreme = 1;
} else if (!pb->path_bias_extreme) {
pb->path_bias_extreme = 1;
log_warn(LD_CIRC,
"Your Guard %s is failing an extremely large "
"amount of circuits. "
@ -1384,19 +1401,19 @@ pathbias_measure_close_rate(entry_guard_t *guard)
"For reference, your timeout cutoff is %ld seconds.",
entry_guard_describe(guard),
tor_lround(pathbias_get_close_success_count(guard)),
tor_lround(guard->pb.circ_attempts),
tor_lround(pb->circ_attempts),
tor_lround(pathbias_get_use_success_count(guard)),
tor_lround(guard->pb.use_attempts),
tor_lround(guard->pb.circ_successes),
tor_lround(guard->pb.unusable_circuits),
tor_lround(guard->pb.collapsed_circuits),
tor_lround(guard->pb.timeouts),
tor_lround(pb->use_attempts),
tor_lround(pb->circ_successes),
tor_lround(pb->unusable_circuits),
tor_lround(pb->collapsed_circuits),
tor_lround(pb->timeouts),
tor_lround(get_circuit_build_close_time_ms()/1000));
}
} else if (pathbias_get_close_success_count(guard)/guard->pb.circ_attempts
} else if (pathbias_get_close_success_count(guard)/pb->circ_attempts
< pathbias_get_warn_rate(options)) {
if (!guard->pb.path_bias_warned) {
guard->pb.path_bias_warned = 1;
if (!pb->path_bias_warned) {
pb->path_bias_warned = 1;
log_warn(LD_CIRC,
"Your Guard %s is failing a very large "
"amount of circuits. "
@ -1409,19 +1426,19 @@ pathbias_measure_close_rate(entry_guard_t *guard)
"For reference, your timeout cutoff is %ld seconds.",
entry_guard_describe(guard),
tor_lround(pathbias_get_close_success_count(guard)),
tor_lround(guard->pb.circ_attempts),
tor_lround(pb->circ_attempts),
tor_lround(pathbias_get_use_success_count(guard)),
tor_lround(guard->pb.use_attempts),
tor_lround(guard->pb.circ_successes),
tor_lround(guard->pb.unusable_circuits),
tor_lround(guard->pb.collapsed_circuits),
tor_lround(guard->pb.timeouts),
tor_lround(pb->use_attempts),
tor_lround(pb->circ_successes),
tor_lround(pb->unusable_circuits),
tor_lround(pb->collapsed_circuits),
tor_lround(pb->timeouts),
tor_lround(get_circuit_build_close_time_ms()/1000));
}
} else if (pathbias_get_close_success_count(guard)/guard->pb.circ_attempts
} else if (pathbias_get_close_success_count(guard)/pb->circ_attempts
< pathbias_get_notice_rate(options)) {
if (!guard->pb.path_bias_noticed) {
guard->pb.path_bias_noticed = 1;
if (!pb->path_bias_noticed) {
pb->path_bias_noticed = 1;
log_notice(LD_CIRC,
"Your Guard %s is failing more circuits than "
"usual. "
@ -1432,13 +1449,13 @@ pathbias_measure_close_rate(entry_guard_t *guard)
"For reference, your timeout cutoff is %ld seconds.",
entry_guard_describe(guard),
tor_lround(pathbias_get_close_success_count(guard)),
tor_lround(guard->pb.circ_attempts),
tor_lround(pb->circ_attempts),
tor_lround(pathbias_get_use_success_count(guard)),
tor_lround(guard->pb.use_attempts),
tor_lround(guard->pb.circ_successes),
tor_lround(guard->pb.unusable_circuits),
tor_lround(guard->pb.collapsed_circuits),
tor_lround(guard->pb.timeouts),
tor_lround(pb->use_attempts),
tor_lround(pb->circ_successes),
tor_lround(pb->unusable_circuits),
tor_lround(pb->collapsed_circuits),
tor_lround(pb->timeouts),
tor_lround(get_circuit_build_close_time_ms()/1000));
}
}
@ -1458,9 +1475,10 @@ static void
pathbias_scale_close_rates(entry_guard_t *guard)
{
const or_options_t *options = get_options();
guard_pathbias_t *pb = entry_guard_get_pathbias_state(guard);
/* If we get a ton of circuits, just scale everything down */
if (guard->pb.circ_attempts > pathbias_get_scale_threshold(options)) {
if (pb->circ_attempts > pathbias_get_scale_threshold(options)) {
double scale_ratio = pathbias_get_scale_ratio(options);
int opened_attempts = pathbias_count_circs_in_states(guard,
PATH_STATE_BUILD_ATTEMPTED, PATH_STATE_BUILD_ATTEMPTED);
@ -1468,36 +1486,36 @@ pathbias_scale_close_rates(entry_guard_t *guard)
PATH_STATE_BUILD_SUCCEEDED,
PATH_STATE_USE_FAILED);
/* Verify that the counts are sane before and after scaling */
int counts_are_sane = (guard->pb.circ_attempts >= guard->pb.circ_successes);
int counts_are_sane = (pb->circ_attempts >= pb->circ_successes);
guard->pb.circ_attempts -= (opened_attempts+opened_built);
guard->pb.circ_successes -= opened_built;
pb->circ_attempts -= (opened_attempts+opened_built);
pb->circ_successes -= opened_built;
guard->pb.circ_attempts *= scale_ratio;
guard->pb.circ_successes *= scale_ratio;
guard->pb.timeouts *= scale_ratio;
guard->pb.successful_circuits_closed *= scale_ratio;
guard->pb.collapsed_circuits *= scale_ratio;
guard->pb.unusable_circuits *= scale_ratio;
pb->circ_attempts *= scale_ratio;
pb->circ_successes *= scale_ratio;
pb->timeouts *= scale_ratio;
pb->successful_circuits_closed *= scale_ratio;
pb->collapsed_circuits *= scale_ratio;
pb->unusable_circuits *= scale_ratio;
guard->pb.circ_attempts += (opened_attempts+opened_built);
guard->pb.circ_successes += opened_built;
pb->circ_attempts += (opened_attempts+opened_built);
pb->circ_successes += opened_built;
entry_guards_changed();
log_info(LD_CIRC,
"Scaled pathbias counts to (%f,%f)/%f (%d/%d open) for guard "
"%s",
guard->pb.circ_successes, guard->pb.successful_circuits_closed,
guard->pb.circ_attempts, opened_built, opened_attempts,
pb->circ_successes, pb->successful_circuits_closed,
pb->circ_attempts, opened_built, opened_attempts,
entry_guard_describe(guard));
/* Have the counts just become invalid by this scaling attempt? */
if (counts_are_sane && guard->pb.circ_attempts < guard->pb.circ_successes) {
if (counts_are_sane && pb->circ_attempts < pb->circ_successes) {
log_notice(LD_BUG,
"Scaling has mangled pathbias counts to %f/%f (%d/%d open) "
"for guard %s",
guard->pb.circ_successes, guard->pb.circ_attempts, opened_built,
pb->circ_successes, pb->circ_attempts, opened_built,
opened_attempts,
entry_guard_describe(guard));
}
@ -1517,33 +1535,34 @@ void
pathbias_scale_use_rates(entry_guard_t *guard)
{
const or_options_t *options = get_options();
guard_pathbias_t *pb = entry_guard_get_pathbias_state(guard);
/* If we get a ton of circuits, just scale everything down */
if (guard->pb.use_attempts > pathbias_get_scale_use_threshold(options)) {
if (pb->use_attempts > pathbias_get_scale_use_threshold(options)) {
double scale_ratio = pathbias_get_scale_ratio(options);
int opened_attempts = pathbias_count_circs_in_states(guard,
PATH_STATE_USE_ATTEMPTED, PATH_STATE_USE_SUCCEEDED);
/* Verify that the counts are sane before and after scaling */
int counts_are_sane = (guard->pb.use_attempts >= guard->pb.use_successes);
int counts_are_sane = (pb->use_attempts >= pb->use_successes);
guard->pb.use_attempts -= opened_attempts;
pb->use_attempts -= opened_attempts;
guard->pb.use_attempts *= scale_ratio;
guard->pb.use_successes *= scale_ratio;
pb->use_attempts *= scale_ratio;
pb->use_successes *= scale_ratio;
guard->pb.use_attempts += opened_attempts;
pb->use_attempts += opened_attempts;
log_info(LD_CIRC,
"Scaled pathbias use counts to %f/%f (%d open) for guard %s",
guard->pb.use_successes, guard->pb.use_attempts, opened_attempts,
pb->use_successes, pb->use_attempts, opened_attempts,
entry_guard_describe(guard));
/* Have the counts just become invalid by this scaling attempt? */
if (counts_are_sane && guard->pb.use_attempts < guard->pb.use_successes) {
if (counts_are_sane && pb->use_attempts < pb->use_successes) {
log_notice(LD_BUG,
"Scaling has mangled pathbias usage counts to %f/%f "
"(%d open) for guard %s",
guard->pb.circ_successes, guard->pb.circ_attempts,
pb->circ_successes, pb->circ_attempts,
opened_attempts, entry_guard_describe(guard));
}

7
src/or/entrynodes.c
View File

@ -184,6 +184,13 @@ entry_guard_get_rsa_id_digest(const entry_guard_t *guard)
return guard->identity;
}
/** Return the pathbias state associated with <b>guard</b>. */
guard_pathbias_t *
entry_guard_get_pathbias_state(entry_guard_t *guard)
{
return &guard->pb;
}
/** Check whether the entry guard <b>e</b> is usable, given the directory
* authorities' opinion about the router (stored in <b>ri</b>) and the user's
* configuration (in <b>options</b>). Set <b>e</b>->bad_since

3
src/or/entrynodes.h
View File

@ -53,7 +53,7 @@ typedef struct guard_pathbias_t {
* this guard as first hop. */
} guard_pathbias_t;
#if defined(ENTRYNODES_PRIVATE) || defined(ENTRYNODES_EXPOSE_STRUCT)
#if defined(ENTRYNODES_PRIVATE)
/** An entry_guard_t represents our information about a chosen long-term
* first hop, known as a "helper" node in the literature. We can't just
* use a node_t, since we want to remember these even when we
@ -106,6 +106,7 @@ const node_t *entry_guard_find_node(const entry_guard_t *guard);
void entry_guard_mark_bad(entry_guard_t *guard);
const char *entry_guard_get_rsa_id_digest(const entry_guard_t *guard);
const char *entry_guard_describe(const entry_guard_t *guard);
guard_pathbias_t *entry_guard_get_pathbias_state(entry_guard_t *guard);
#ifdef ENTRYNODES_PRIVATE
STATIC const node_t *add_an_entry_guard(guard_selection_t *gs,