From 246a4a98fb0966c75f4cb246741219126b70e3c2 Mon Sep 17 00:00:00 2001
From: Steffen Vogel <post@steffenvogel.de>
Date: Tue, 23 May 2017 09:12:24 +0200
Subject: [PATCH] zeromq: added zmq-keygen as a new tool

---
 packaging/rpm/villas-node.spec |  1 +
 tools/Makefile.inc             |  6 ++++
 tools/zmq-keygen.c             | 52 ++++++++++++++++++++++++++++++++++
 3 files changed, 59 insertions(+)
 create mode 100644 tools/zmq-keygen.c

diff --git a/packaging/rpm/villas-node.spec b/packaging/rpm/villas-node.spec
index c8879e636..58ec70c3d 100644
--- a/packaging/rpm/villas-node.spec
+++ b/packaging/rpm/villas-node.spec
@@ -57,6 +57,7 @@ rm -rf %{?buildroot}
 /usr/bin/villas
 /usr/bin/villas-*
 /usr/bin/conf2json
+/usr/bin/zmq-keygen
 
 /usr/lib/libvillas.so
 /usr/lib/libvillas.so.*
diff --git a/tools/Makefile.inc b/tools/Makefile.inc
index 534d34c6e..6f2392176 100644
--- a/tools/Makefile.inc
+++ b/tools/Makefile.inc
@@ -26,6 +26,12 @@ TOOLS_CFLAGS = $(CFLAGS)
 TOOLS_LDLIBS = -lconfig -ljansson -lvillas
 TOOLS_LDFLAGS = $(LDFLAGS) -Wl,-rpath,'$$ORIGIN'
 
+ifeq ($(shell $(PKGCONFIG) libzmq; echo $$?),0)
+	TOOLS += $(BUILDDIR)/zmq-keygen
+	TOOLS_CFLAGS += $(shell $(PKGCONFIG) --cflags libzmq)
+	TOOLS_LDLIBS += $(shell $(PKGCONFIG) --libs libzmq)
+endif
+
 # Compile executable objects
 $(BUILDDIR)/tools/%.o: tools/%.c $(BUILDDIR)/defines | $$(dir $$@)
 	$(CC) $(TOOLS_CFLAGS) -c $< -o $@
diff --git a/tools/zmq-keygen.c b/tools/zmq-keygen.c
new file mode 100644
index 000000000..0984abb54
--- /dev/null
+++ b/tools/zmq-keygen.c
@@ -0,0 +1,52 @@
+/*
+	Copyright (c) 2007-2016 Contributors as noted in the AUTHORS file
+
+	This file is part of libzmq, the ZeroMQ core engine in C++.
+
+	libzmq is free software; you can redistribute it and/or modify it under
+	the terms of the GNU Lesser General Public License (LGPL) as published
+	by the Free Software Foundation; either version 3 of the License, or
+	(at your option) any later version.
+
+	As a special exception, the Contributors give you permission to link
+	this library with independent modules to produce an executable,
+	regardless of the license terms of these independent modules, and to
+	copy and distribute the resulting executable under terms of your choice,
+	provided that you also meet, for each linked independent module, the
+	terms and conditions of the license of that module. An independent
+	module is a module which is not derived from or based on this library.
+	If you modify this library, you must extend this exception to your
+	version of the library.
+
+	libzmq 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 Lesser General Public
+	License for more details.
+
+	You should have received a copy of the GNU Lesser General Public License
+	along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <stdlib.h>
+#include <assert.h>
+#include <zmq.h>
+
+int main (int argc, char *argv[])
+{
+	char public_key [41];
+	char secret_key [41];
+	if (zmq_curve_keypair(public_key, secret_key)) {
+		if (zmq_errno() == ENOTSUP)
+			printf("To use %s, please install libsodium and then rebuild libzmq.", argv[0]);
+
+		exit (EXIT_FAILURE);
+	}
+	
+	printf("# Copy these lines to your 'zeromq' node-configuration\n");
+	printf("curve = {\n");
+	printf("\tpublic_key = \"%s\";\n", public_key);
+	printf("\tsecret_key = \"%s\";\n", secret_key);
+	printf("}\n");
+
+	exit (0);
+}
\ No newline at end of file