polished reg exp handling and fixed bugs

src/sn.c

@@ -100,7 +100,7 @@ static int load_allowed_sn_community(n2n_sn_t *sss, char *path) {
 
   fclose(fd);
 
-  if (num_regex>0 || num_communities>0 )
+  if ((num_regex + num_communities) == 0)
   {
     traceEvent(TRACE_WARNING, "File %s does not contain any valid community names or regular expressions", path);
     return -1;

src/sn_utils.c

@@ -253,6 +253,9 @@ void sn_term(n2n_sn_t *sss)
 
     HASH_ITER(hh, sss->rules, re, tmp_re) {
       HASH_DEL(sss->rules, re);
+      if (NULL!=re->rule) {
+        free(re->rule);
+      }
       free(re);
     }
 }
@@ -833,12 +836,12 @@ static int process_udp(n2n_sn_t * sss,
           break;
         }
       }
-    }
       if(match != 1) {
         traceEvent(TRACE_INFO, "Discarded registration: unallowed community '%s'",
                    (char*)cmn.community);
         return -1;
       }
+    }
 
     if(!comm && (!sss->lock_communities || (match == 1))) {
       comm = calloc(1, sizeof(struct sn_community));