Refactor routerstatus_has_changed function

- Check all fields that might change in a routerstatus
- Document the refactoring

Signed-off-by: Victor Nepveu <victor.nepveu@imt-atlantique.net>

changes/ticket20218

+  o Minor bugfixes (controller):
+    - In routerstatus_has_changed(), check all the fields that are output over the control port.
+      Fixes bug 20218; bugfix on 0.1.1.11-alpha

src/feature/nodelist/fmt_routerstatus.c

@@ -124,6 +124,8 @@ routerstatus_format_entry(const routerstatus_t *rs, const char *version,
     if (format != NS_CONTROL_PORT) {
       /* Blow up more or less nicely if we didn't get anything or not the
        * thing we expected.
+       * This should be kept in sync with the function
+       * routerstatus_has_changed and the struct routerstatus_t
        */
       if (!desc) {
         char id[HEX_DIGEST_LEN+1];

src/feature/nodelist/networkstatus.c

@@ -101,6 +101,7 @@
 #include "feature/nodelist/routerlist_st.h"
 #include "feature/dirauth/vote_microdesc_hash_st.h"
 #include "feature/nodelist/vote_routerstatus_st.h"
+#include "routerstatus_st.h"
 
 #ifdef HAVE_UNISTD_H
 #include <unistd.h>
@@ -1603,8 +1604,14 @@ networkstatus_consensus_has_ipv6(const or_options_t* options)
   }
 }
 
-/** Given two router status entries for the same router identity, return 1 if
- * if the contents have changed between them. Otherwise, return 0. */
+/** Given two router status entries for the same router identity, return 1
+ * if the contents have changed between them. Otherwise, return 0.
+ * It only checks for fields that are output by control port.
+ * This should be kept in sync with the struct routerstatus_t
+ * and the printing function routerstatus_format_entry in
+ * NS_CONTROL_PORT mode.
+ **/
+
 static int
 routerstatus_has_changed(const routerstatus_t *a, const routerstatus_t *b)
 {
@@ -1625,9 +1632,14 @@ routerstatus_has_changed(const routerstatus_t *a, const routerstatus_t *b)
          a->is_valid != b->is_valid ||
          a->is_possible_guard != b->is_possible_guard ||
          a->is_bad_exit != b->is_bad_exit ||
-         a->is_hs_dir != b->is_hs_dir;
-  // XXXX this function needs a huge refactoring; it has gotten out
-  // XXXX of sync with routerstatus_t, and it will do so again.
+         a->is_hs_dir != b->is_hs_dir ||
+         a->is_staledesc != b->is_staledesc ||
+         a->has_bandwidth != b->has_bandwidth ||
+         a->published_on != b->published_on ||
+         a->ipv6_orport != b->ipv6_orport ||
+         a->is_v2_dir != b->is_v2_dir ||
+         a->bandwidth_kb != b->bandwidth_kb ||
+         tor_addr_compare(&a->ipv6_addr, &b->ipv6_addr, CMP_EXACT);
 }
 
 /** Notify controllers of any router status entries that changed between

src/feature/nodelist/routerstatus_st.h

@@ -17,6 +17,10 @@
 /** Contents of a single router entry in a network status object.
  */
 struct routerstatus_t {
+ /* This should be kept in sync with the function
+ * routerstatus_has_changed and the printing function
+ * routerstatus_format_entry in NS_CONTROL_PORT mode.
+ */
   time_t published_on; /**< When was this router published? */
   char nickname[MAX_NICKNAME_LEN+1]; /**< The nickname this router says it
                                       * has. */