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relay: On new consensus, reconfigure DNS nameservers

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This applies only for relays. Previous commit adds two new consensus
parameters that dictate how libevent is configured with DNS resolution.
And so, with a new consensus, we now look at those values in case they
ever change.

Without this, Exit relay would have to HUP or restart to apply any new
Exit DNS consensus parameters.

Related to #40312

Signed-off-by: David Goulet <dgoulet@torproject.org>
This commit is contained in:
David Goulet 2022-01-19 14:37:26 -05:00
parent 347eaa32bf
commit 2cdb5ceb1d
3 changed files with 18 additions and 0 deletions
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2
src/feature/nodelist/networkstatus.c
View File

@ -82,6 +82,7 @@
#include "feature/nodelist/routerinfo.h"
#include "feature/nodelist/routerlist.h"
#include "feature/nodelist/torcert.h"
#include "feature/relay/dns.h"
#include "feature/relay/routermode.h"
#include "lib/crypt_ops/crypto_rand.h"
#include "lib/crypt_ops/crypto_util.h"
@ -1706,6 +1707,7 @@ notify_after_networkstatus_changes(void)
congestion_control_new_consensus_params(c);
flow_control_new_consensus_params(c);
hs_service_new_consensus_params(c);
dns_new_consensus_params(c);
/* Maintenance of our L2 guard list */
maintain_layer2_guards();

13
src/feature/relay/dns.c
View File

@ -213,6 +213,19 @@ evdns_log_cb(int warn, const char *msg)
tor_log(severity, LD_EXIT, "eventdns: %s", msg);
}
/** New consensus just appeared, take appropriate actions if need be. */
void
dns_new_consensus_params(const networkstatus_t *ns)
{
(void) ns;
/* Consensus has parameters for the Exit relay DNS side and so we only reset
* the DNS nameservers if we are in server mode. */
if (server_mode(get_options())) {
dns_reset();
}
}
/** Initialize the DNS subsystem; called by the OR process. */
int
dns_init(void)

3
src/feature/relay/dns.h
View File

@ -26,6 +26,7 @@ void dns_reset_correctness_checks(void);
size_t dns_cache_total_allocation(void);
void dump_dns_mem_usage(int severity);
size_t dns_cache_handle_oom(time_t now, size_t min_remove_bytes);
void dns_new_consensus_params(const networkstatus_t *ns);
/* These functions are only used within the feature/relay module, and don't
* need stubs. */
@ -47,6 +48,8 @@ void dns_launch_correctness_checks(void);
((void)(severity))
#define dns_cache_handle_oom(now, bytes) \
((void)(now), (void)(bytes), 0)
#define dns_new_consensus_params(ns) \
((void) ns)
#define connection_dns_remove(conn) \
STMT_BEGIN \