1 files changed, 12 insertions, 2 deletions
diff --git a/src/or/dns.h b/src/or/dns.h
index b14f7dd29c..951a2a3467 100644
--- a/src/or/dns.h
+++ b/src/or/dns.h
@@ -12,6 +12,18 @@
 #ifndef TOR_DNS_H
 #define TOR_DNS_H
 
+/** Lowest value for DNS ttl that a server will give. */
+#define MIN_DNS_TTL_AT_EXIT (5*60)
+/** Highest value for DNS ttl that a server will give. */
+#define MAX_DNS_TTL_AT_EXIT (60*60)
+
+/** How long do we keep DNS cache entries before purging them (regardless of
+ * their TTL)? */
+#define MAX_DNS_ENTRY_AGE (3*60*60)
+/** How long do we cache/tell clients to cache DNS records when no TTL is
+ * known? */
+#define DEFAULT_DNS_TTL (30*60)
+
 int dns_init(void);
 int has_dns_init_failed(void);
 void dns_free_all(void);
@@ -31,8 +43,6 @@ void dump_dns_mem_usage(int severity);
 #ifdef DNS_PRIVATE
 #include "dns_structs.h"
 
-STATIC uint32_t dns_get_expiry_ttl(uint32_t ttl);
-
 MOCK_DECL(STATIC int,dns_resolve_impl,(edge_connection_t *exitconn,
 int is_resolve,or_circuit_t *oncirc, char **hostname_out,
 int *made_connection_pending_out, cached_resolve_t **resolve_out));