added v6 support, untested, may not work yet

host.h

@@ -0,0 +1,54 @@
+/*
+    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>.
+*/
+
+#ifndef _HAVE_HOST_H
+#define _HAVE_HOST_H
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <unistd.h>
+#include <time.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+#include <netdb.h>
+#include <net/if.h> // if_nametoindex()
+#include <ifaddrs.h>
+
+struct _host_t {
+  int is_v6;
+  struct sockaddr *sock;
+  size_t size;
+  char *ip;
+  int port;
+};
+typedef struct _host_t host_t;
+
+unsigned get_v6_scope(const char *ip);
+int is_linklocal(struct in6_addr *a);
+host_t *get_host(char *ip, int port, struct sockaddr_in *v4, struct sockaddr_in6 *v6);
+char *is_v6(char *ip);
+
+#endif