diff --git a/libfdproto/utils.c b/libfdproto/utils.c
new file mode 100644
index 0000000..f2440cf
--- /dev/null
+++ b/libfdproto/utils.c
@@ -0,0 +1,84 @@
+/*********************************************************************************************************
+* Software License Agreement (BSD License)                                                               *
+* Author: Sebastien Decugis <sdecugis@freediameter.net>							 *
+*													 *
+* Copyright (c) 2013, WIDE Project and NICT								 *
+* All rights reserved.											 *
+* 													 *
+* Redistribution and use of this software in source and binary forms, with or without modification, are  *
+* permitted provided that the following conditions are met:						 *
+* 													 *
+* * Redistributions of source code must retain the above 						 *
+*   copyright notice, this list of conditions and the 							 *
+*   following disclaimer.										 *
+*    													 *
+* * Redistributions in binary form must reproduce the above 						 *
+*   copyright notice, this list of conditions and the 							 *
+*   following disclaimer in the documentation and/or other						 *
+*   materials provided with the distribution.								 *
+* 													 *
+* * Neither the name of the WIDE Project or NICT nor the 						 *
+*   names of its contributors may be used to endorse or 						 *
+*   promote products derived from this software without 						 *
+*   specific prior written permission of WIDE Project and 						 *
+*   NICT.												 *
+* 													 *
+* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED *
+* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A *
+* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR *
+* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 	 *
+* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 	 *
+* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR *
+* TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF   *
+* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.								 *
+*********************************************************************************************************/
+
+#include "fdproto-internal.h"
+
+DECLARE_FD_DUMP_PROTOTYPE(fd_sa_dump, sSA * sa, int flags) 
+{
+	char addrbuf[INET6_ADDRSTRLEN];
+	char servbuf[32];
+	int rc;
+	FD_DUMP_HANDLE_OFFSET();
+	
+	servbuf[0] = 0;
+	
+	if (sa) {
+		if (sSAport(sa)) {
+			rc = getnameinfo(sa, sSAlen( sa ), addrbuf, sizeof(addrbuf), servbuf, sizeof(servbuf), flags);
+		} else {
+			rc = getnameinfo(sa, sSAlen( sa ), addrbuf, sizeof(addrbuf), NULL, 0, flags);
+		}
+		if (rc) {
+			CHECK_MALLOC_DO( fd_dump_extend( FD_DUMP_STD_PARAMS, "%s", gai_strerror(rc)), return NULL);
+		} else {
+			if (servbuf[0]) {
+				CHECK_MALLOC_DO( fd_dump_extend( FD_DUMP_STD_PARAMS, "%s(%s)", &addrbuf[0], &servbuf[0]), return NULL);
+			} else {
+				CHECK_MALLOC_DO( fd_dump_extend( FD_DUMP_STD_PARAMS, "%s", &addrbuf[0]), return NULL);
+			}
+		}
+	} else {
+		CHECK_MALLOC_DO( fd_dump_extend( FD_DUMP_STD_PARAMS, "(NULL / ANY)"), return NULL);
+	}
+	return *buf;
+}
+
+void fd_sa_sdump_numeric(char * buf /* must be at least sSA_DUMP_STRLEN */, sSA * sa)
+{
+	char addrbuf[INET6_ADDRSTRLEN];
+	char servbuf[32];
+	
+	if (sa) {
+		int rc = getnameinfo(sa, sSAlen( sa ), addrbuf, sizeof(addrbuf), servbuf, sizeof(servbuf), NI_NUMERICHOST | NI_NUMERICSERV);
+		if (rc) {
+			snprintf(buf, sSA_DUMP_STRLEN, "%s", gai_strerror(rc));
+		} else {
+			snprintf(buf, sSA_DUMP_STRLEN, "%s(%s)", addrbuf, servbuf);
+		}
+	} else {
+		snprintf(buf, sSA_DUMP_STRLEN, "(NULL / ANY)");
+	}
+	
+}