ipv6 works now as well, added fork, added syslog

log.c

@@ -0,0 +1,41 @@
+/*
+    This file is part of udpxd.
+
+    Copyright (C) 2015 T.v.Dein.
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+    You can contact me by mail: <tom AT vondein DOT org>.
+*/
+
+#include "log.h"
+
+
+
+void verbose(const char * fmt, ...) {
+  if(VERBOSE) {
+    char *msg = NULL;
+    va_list ap;
+    va_start(ap, fmt);
+    vasprintf(&msg, fmt, ap);
+    va_end(ap);
+
+    if(FORKED) {
+      syslog(LOG_INFO, msg);
+    }
+    else {
+      fprintf(stderr, msg);
+    }
+  }
+}