swanctl: Add --list-algs command to query loaded algorithms

src/swanctl/Makefile.am

@@ -11,6 +11,7 @@ swanctl_SOURCES = \
 	commands/list_conns.c \
 	commands/list_certs.c \
 	commands/list_pools.c \
+	commands/list_algs.c \
 	commands/load_all.c \
 	commands/load_authorities.h  commands/load_authorities.c \
 	commands/load_conns.c commands/load_conns.h \

src/swanctl/command.h

@@ -27,7 +27,7 @@
 /**
  * Maximum number of commands (+1).
  */
-#define MAX_COMMANDS 21
+#define MAX_COMMANDS 22
 
 /**
  * Maximum number of options in a command (+3)

src/swanctl/commands/list_algs.c

@@ -0,0 +1,104 @@
+/*
+ * Copyright (C) 2015 Tobias Brunner
+ * Hochschule fuer Technik Rapperswil
+ *
+ * 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>
+
+CALLBACK(algs, int,
+	void *null, vici_res_t *res, char *name, void *value, int len)
+{
+	if (chunk_printable(chunk_create(value, len), NULL, ' '))
+	{
+		printf("  %s[%.*s]\n", name, len, value);
+	}
+	return 0;
+}
+
+CALLBACK(types, int,
+	void *null, vici_res_t *res, char *name)
+{
+	printf("%s:\n", name);
+	return vici_parse_cb(res, NULL, algs, NULL, NULL);
+}
+
+static int algorithms(vici_conn_t *conn)
+{
+	vici_req_t *req;
+	vici_res_t *res;
+	char *arg;
+	command_format_options_t format = COMMAND_FORMAT_NONE;
+	int ret;
+
+	while (TRUE)
+	{
+		switch (command_getopt(&arg))
+		{
+			case 'h':
+				return command_usage(NULL);
+			case 'P':
+				format |= COMMAND_FORMAT_PRETTY;
+				/* fall through to raw */
+			case 'r':
+				format |= COMMAND_FORMAT_RAW;
+				continue;
+			case EOF:
+				break;
+			default:
+				return command_usage("invalid --list-algs option");
+		}
+		break;
+	}
+
+	req = vici_begin("get-algorithms");
+	res = vici_submit(req, conn);
+	if (!res)
+	{
+		ret = errno;
+		fprintf(stderr, "get-algorithms request failed: %s\n", strerror(errno));
+		return ret;
+	}
+	if (format & COMMAND_FORMAT_RAW)
+	{
+		vici_dump(res, "get-algorithms reply", format & COMMAND_FORMAT_PRETTY,
+				  stdout);
+	}
+	else
+	{
+		if (vici_parse_cb(res, types, NULL, NULL, NULL) != 0)
+		{
+			fprintf(stderr, "parsing get-algorithms reply failed: %s\n",
+					strerror(errno));
+		}
+	}
+	vici_free_res(res);
+	return 0;
+}
+
+/**
+ * Register the command.
+ */
+static void __attribute__ ((constructor))reg()
+{
+	command_register((command_t) {
+		algorithms, 'g', "list-algs", "show loaded algorithms",
+		{"[--raw|--pretty]"},
+		{
+			{"help",		'h', 0, "show usage information"},
+			{"raw",			'r', 0, "dump raw response message"},
+			{"pretty",		'P', 0, "dump raw response message in pretty print"},
+		}
+	});
+}

src/swanctl/swanctl.8.in

@@ -1,4 +1,4 @@
-.TH SWANCTL 8 "2014-04-28" "@PACKAGE_VERSION@" "strongSwan"
+.TH SWANCTL 8 "2015-11-20" "@PACKAGE_VERSION@" "strongSwan"
 .SH NAME
 swanctl \- strongSwan configuration, control and monitoring command line interface.
 .SH SYNOPSIS
@@ -68,6 +68,9 @@ list stored certificates
 .B "\-A, \-\-list\-pools"
 list loaded pool configurations
 .TP
+.B "\-g, \-\-list\-algs"
+list loaded algorithms and their implementation
+.TP
 .B "\-q, \-\-load\-all"
 (re\-)load credentials, pools, authorities and connections
 .TP