prop224: Helper to dup a link_specifier_t object

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

src/or/hs_common.c

@@ -541,6 +541,24 @@ hs_build_address(const ed25519_public_key_t *key, uint8_t version,
   tor_assert(hs_address_is_valid(addr_out));
 }
 
+/* Return a newly allocated copy of lspec. */
+link_specifier_t *
+hs_link_specifier_dup(const link_specifier_t *lspec)
+{
+  link_specifier_t *dup = link_specifier_new();
+  memcpy(dup, lspec, sizeof(*dup));
+  /* The unrecognized field is a dynamic array so make sure to copy its
+   * content and not the pointer. */
+  link_specifier_setlen_un_unrecognized(
+                        dup, link_specifier_getlen_un_unrecognized(lspec));
+  if (link_specifier_getlen_un_unrecognized(dup)) {
+    memcpy(link_specifier_getarray_un_unrecognized(dup),
+           link_specifier_getconstarray_un_unrecognized(lspec),
+           link_specifier_getlen_un_unrecognized(dup));
+  }
+  return dup;
+}
+
 /* Initialize the entire HS subsytem. This is called in tor_init() before any
  * torrc options are loaded. Only for >= v3. */
 void

src/or/hs_common.h

@@ -11,6 +11,9 @@
 
 #include "or.h"
 
+/* Trunnel */
+#include "ed25519_cert.h"
+
 /* Protocol version 2. Use this instead of hardcoding "2" in the code base,
  * this adds a clearer semantic to the value when used. */
 #define HS_VERSION_TWO 2
@@ -113,6 +116,8 @@ const uint8_t *rend_data_get_pk_digest(const rend_data_t *rend_data,
 
 uint64_t hs_get_next_time_period_num(time_t now);
 
+link_specifier_t *hs_link_specifier_dup(const link_specifier_t *lspec);
+
 #ifdef HS_COMMON_PRIVATE
 
 #ifdef TOR_UNIT_TESTS