add new GETINFO config/defaults

returns the default values for every configuration item, similar
to GETINFO config/names; include a changes entry for it.

Fix for bug 4971

1 files changed, 14 insertions, 0 deletions

diff --git a/src/or/config.c b/src/or/config.c
index 042fc1aa3c..ceb21b0cf0 100644
--- a/src/or/config.c
+++ b/src/or/config.c
@@ -7180,6 +7180,20 @@ getinfo_helper_config(control_connection_t *conn,
     *answer = smartlist_join_strings(sl, "", 0, NULL);
     SMARTLIST_FOREACH(sl, char *, c, tor_free(c));
     smartlist_free(sl);
+  } else if (!strcmp(question, "config/defaults")) {
+    smartlist_t *sl = smartlist_new();
+    int i;
+    for (i = 0; _option_vars[i].name; ++i) {
+      const config_var_t *var = &_option_vars[i];
+      if (var->initvalue != NULL) {
+          char *val = esc_for_log(var->initvalue);
+          smartlist_add_asprintf(sl, "%s %s\n",var->name,val);
+          tor_free(val);
+      }
+    }
+    *answer = smartlist_join_strings(sl, "", 0, NULL);
+    SMARTLIST_FOREACH(sl, char *, c, tor_free(c));
+    smartlist_free(sl);
   }
   return 0;
 }