swanctl: Add a version command to query daemon and OS info

src/swanctl/Makefile.am

@@ -4,6 +4,7 @@ swanctl_SOURCES = \
 	command.c command.h \
 	commands/initiate.c \
 	commands/terminate.c \
+	commands/version.c \
 	commands/list_sas.c \
 	swanctl.c
 

src/swanctl/commands/version.c

@@ -0,0 +1,81 @@
+/*
+ * Copyright (C) 2014 Martin Willi
+ * Copyright (C) 2014 revosec AG
+ *
+ * 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 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * 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.
+ */
+
+#include "command.h"
+
+#include <errno.h>
+
+static int version(vici_conn_t *conn)
+{
+	vici_req_t *req;
+	vici_res_t *res;
+	char *arg;
+	bool raw = FALSE;
+
+	while (TRUE)
+	{
+		switch (command_getopt(&arg))
+		{
+			case 'h':
+				return command_usage(NULL);
+			case 'r':
+				raw = TRUE;
+				continue;
+			case EOF:
+				break;
+			default:
+				return command_usage("invalid --terminate option");
+		}
+		break;
+	}
+
+	req = vici_begin("version");
+	res = vici_submit(req, conn);
+	if (!res)
+	{
+		fprintf(stderr, "version request failed: %s\n", strerror(errno));
+		return errno;
+	}
+	if (raw)
+	{
+		vici_dump(res, "version reply", stdout);
+	}
+	else
+	{
+		printf("strongSwan %s %s (%s, %s, %s)\n",
+			vici_find_str(res, "", "version"),
+			vici_find_str(res, "", "daemon"),
+			vici_find_str(res, "", "sysname"),
+			vici_find_str(res, "", "release"),
+			vici_find_str(res, "", "machine"));
+	}
+	vici_free_res(res);
+	return 0;
+}
+
+/**
+ * Register the command.
+ */
+static void __attribute__ ((constructor))reg()
+{
+	command_register((command_t) {
+		version, 'v', "version", "show daemon version information",
+		{"[--raw]"},
+		{
+			{"help",		'h', 0, "show usage information"},
+			{"raw",			'r', 0, "dump raw response message"},
+		}
+	});
+}