hs-v3: Add protover HSIntro=5

Signed-off-by: David Goulet <dgoulet@torproject.org>

5 files changed, 21 insertions, 3 deletions

diff --git a/src/core/or/or.h b/src/core/or/or.h
index ab258629a6..990cfacbc0 100644
--- a/src/core/or/or.h
+++ b/src/core/or/or.h
@@ -843,6 +843,10 @@ typedef struct protover_summary_flags_t {
   /** True iff this router has a protocol list that allows clients to
    * negotiate hs circuit setup padding. Requires Padding>=2. */
   unsigned int supports_hs_setup_padding : 1;
+
+  /** True iff this router has a protocol list that allows it to support the
+   * ESTABLISH_INTRO DoS cell extension. Requires HSIntro>=5. */
+  unsigned int supports_establish_intro_dos_extension : 1;
 } protover_summary_flags_t;
 
 typedef struct routerinfo_t routerinfo_t;
diff --git a/src/core/or/protover.c b/src/core/or/protover.c
index ccd33fabf7..905c5e9ed3 100644
--- a/src/core/or/protover.c
+++ b/src/core/or/protover.c
@@ -392,7 +392,7 @@ protover_get_supported_protocols(void)
     "Desc=1-2 "
     "DirCache=1-2 "
     "HSDir=1-2 "
-    "HSIntro=3-4 "
+    "HSIntro=3-5 "
     "HSRend=1-2 "
     "Link=1-5 "
 #ifdef HAVE_WORKING_TOR_TLS_GET_TLSSECRETS
diff --git a/src/core/or/versions.c b/src/core/or/versions.c
index 06417bb4eb..2c32b529f7 100644
--- a/src/core/or/versions.c
+++ b/src/core/or/versions.c
@@ -450,7 +450,9 @@ memoize_protover_summary(protover_summary_flags_t *out,
                                     PROTOVER_HS_RENDEZVOUS_POINT_V3);
   out->supports_hs_setup_padding =
     protocol_list_supports_protocol(protocols, PRT_PADDING,
-              PROTOVER_HS_SETUP_PADDING);
+                                    PROTOVER_HS_SETUP_PADDING);
+  out->supports_establish_intro_dos_extension =
+    protocol_list_supports_protocol(protocols, PRT_HSINTRO, 5);
 
   protover_summary_flags_t *new_cached = tor_memdup(out, sizeof(*out));
   cached = strmap_set(protover_summary_map, protocols, new_cached);
diff --git a/src/feature/nodelist/nodelist.c b/src/feature/nodelist/nodelist.c
index 21914c6c6d..7da3b8524f 100644
--- a/src/feature/nodelist/nodelist.c
+++ b/src/feature/nodelist/nodelist.c
@@ -1106,7 +1106,7 @@ node_ed25519_id_matches(const node_t *node, const ed25519_public_key_t *id)
 /** Dummy object that should be unreturnable.  Used to ensure that
  * node_get_protover_summary_flags() always returns non-NULL. */
 static const protover_summary_flags_t zero_protover_flags = {
-  0,0,0,0,0,0,0,0
+  0,0,0,0,0,0,0,0,0
 };
 
 /** Return the protover_summary_flags for a given node. */
@@ -1166,6 +1166,17 @@ node_supports_ed25519_hs_intro(const node_t *node)
   return node_get_protover_summary_flags(node)->supports_ed25519_hs_intro;
 }
 
+/** Return true iff <b>node</b> supports the DoS ESTABLISH_INTRO cell
+ * extenstion. */
+int
+node_supports_establish_intro_dos_extension(const node_t *node)
+{
+  tor_assert(node);
+
+  return node_get_protover_summary_flags(node)->
+                           supports_establish_intro_dos_extension;
+}
+
 /** Return true iff <b>node</b> supports to be a rendezvous point for hidden
  * service version 3 (HSRend=2). */
 int
diff --git a/src/feature/nodelist/nodelist.h b/src/feature/nodelist/nodelist.h
index 84ab5f7a54..af144c197f 100644
--- a/src/feature/nodelist/nodelist.h
+++ b/src/feature/nodelist/nodelist.h
@@ -76,6 +76,7 @@ int node_supports_ed25519_link_authentication(const node_t *node,
 int node_supports_v3_hsdir(const node_t *node);
 int node_supports_ed25519_hs_intro(const node_t *node);
 int node_supports_v3_rendezvous_point(const node_t *node);
+int node_supports_establish_intro_dos_extension(const node_t *node);
 const uint8_t *node_get_rsa_id_digest(const node_t *node);
 smartlist_t *node_get_link_specifier_smartlist(const node_t *node,
                                                bool direct_conn);