hs-v3: Implement HS_DESC RECEIVED event

Adds a v3 specific function to handle a received event.

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

src/or/control.c

@@ -7398,6 +7398,29 @@ control_event_hsv2_descriptor_received(const char *onion_address,
   tor_free(desc_id_field);
 }
 
+/* Send HS_DESC RECEIVED event
+ *
+ * Called when we successfully received a hidden service descriptor. */
+void
+control_event_hsv3_descriptor_received(const char *onion_address,
+                                       const char *desc_id,
+                                       const char *hsdir_id_digest)
+{
+  char *desc_id_field = NULL;
+
+  if (BUG(!onion_address || !desc_id || !hsdir_id_digest)) {
+    return;
+  }
+
+  /* Because DescriptorID is an optional positional value, we need to add a
+   * whitespace before in order to not be next to the HsDir value. */
+  tor_asprintf(&desc_id_field, " %s", desc_id);
+
+  event_hs_descriptor_receive_end("RECEIVED", onion_address, desc_id_field,
+                                  REND_NO_AUTH, hsdir_id_digest, NULL);
+  tor_free(desc_id_field);
+}
+
 /** send HS_DESC UPLOADED event
  *
  * called when we successfully uploaded a hidden service descriptor.

src/or/control.h

@@ -144,6 +144,9 @@ void control_event_hsv3_descriptor_failed(const char *onion_address,
                                           const char *desc_id,
                                           const char *hsdir_id_digest,
                                           const char *reason);
+void control_event_hsv3_descriptor_received(const char *onion_address,
+                                            const char *desc_id,
+                                            const char *hsdir_id_digest);
 void control_event_hs_descriptor_upload_failed(const char *hs_dir,
                                                const char *onion_address,
                                                const char *reason);

src/or/directory.c

@@ -3098,6 +3098,8 @@ handle_response_fetch_hsdesc_v3(dir_connection_t *conn,
       log_info(LD_REND, "Stored hidden service descriptor successfully.");
       TO_CONN(conn)->purpose = DIR_PURPOSE_HAS_FETCHED_HSDESC;
       hs_client_desc_has_arrived(conn->hs_ident);
+      /* Fire control port RECEIVED event. */
+      hs_control_desc_event_received(conn->hs_ident, conn->identity_digest);
     }
     break;
   case 404:

src/or/hs_control.c

@@ -77,3 +77,28 @@ hs_control_desc_event_failed(const hs_ident_dir_conn_t *ident,
                                        hsdir_id_digest, reason);
 }
 
+/* Send on the control port the "HS_DESC RECEIVED [...]" event.
+ *
+ * Using a directory connection identifier and the HSDir identity digest.
+ * None can be NULL. */
+void
+hs_control_desc_event_received(const hs_ident_dir_conn_t *ident,
+                               const char *hsdir_id_digest)
+{
+  char onion_address[HS_SERVICE_ADDR_LEN_BASE32 + 1];
+  char base64_blinded_pk[ED25519_BASE64_LEN + 1];
+
+  tor_assert(ident);
+  tor_assert(hsdir_id_digest);
+
+  /* Build onion address and encoded blinded key. */
+  IF_BUG_ONCE(ed25519_public_to_base64(base64_blinded_pk,
+                                       &ident->blinded_pk) < 0) {
+    return;
+  }
+  hs_build_address(&ident->identity_pk, HS_VERSION_THREE, onion_address);
+
+  control_event_hsv3_descriptor_received(onion_address, base64_blinded_pk,
+                                         hsdir_id_digest);
+}
+

src/or/hs_control.h

@@ -21,5 +21,9 @@ void hs_control_desc_event_failed(const hs_ident_dir_conn_t *ident,
                                   const char *hsdir_id_digest,
                                   const char *reason);
 
+/* Event "HS_DESC RECEIVED [...]" */
+void hs_control_desc_event_received(const hs_ident_dir_conn_t *ident,
+                                    const char *hsdir_id_digest);
+
 #endif /* !defined(TOR_HS_CONTROL_H) */