Implemented resolver to replace sock_srv_lookup()

src/resolver.h

@@ -0,0 +1,41 @@
+/* resolver.h
+ * strophe XMPP client library -- DNS resolver
+ *
+ * Copyright (C) 2015 Dmitry Podgorny <pasis.ua@gmail.com>
+ *
+ *  This software is provided AS-IS with no warranty, either express
+ *  or implied.
+ *
+ *  This program is dual licensed under the MIT and GPLv3 licenses.
+ */
+
+/** @file
+ *  DNS resolver.
+ */
+
+#ifndef __LIBSTROPHE_RESOLVER_H__
+#define __LIBSTROPHE_RESOLVER_H__
+
+#include "ostypes.h"
+
+/** Perform lookup for RFC1035 message format. */
+int resolver_srv_lookup_buf(const unsigned char *buf, size_t len,
+                            char *target, size_t target_len,
+                            unsigned short *port);
+
+/** Resolve SRV record.
+ *
+ *  @param service service of the SRV record
+ *  @param proto protocol of the SRV record
+ *  @param domain resolving domain
+ *  @param target pre-allocated string where result is stored
+ *  @param target_len maximum size of the target
+ *  @param port pointer where resulting port is stored
+ *
+ *  @return 1 on success or 0 on fail
+ */
+int resolver_srv_lookup(const char *service, const char *proto,
+                        const char *domain, char *target,
+                        size_t target_len, unsigned short *port);
+
+#endif /* __LIBSTROPHE_RESOLVER_H__ */