swanctl: Add --counters command

src/swanctl/Makefile.am

@@ -2,6 +2,7 @@ sbin_PROGRAMS = swanctl
 
 swanctl_SOURCES = \
 	command.c command.h \
+	commands/counters.c \
 	commands/initiate.c \
 	commands/terminate.c \
 	commands/rekey.c \

src/swanctl/command.h

@@ -27,7 +27,7 @@
 /**
  * Maximum number of commands (+1).
  */
-#define MAX_COMMANDS 25
+#define MAX_COMMANDS 26
 
 /**
  * Maximum number of options in a command (+3)

src/swanctl/commands/counters.c

@@ -0,0 +1,154 @@
+/*
+ * Copyright (C) 2017 Tobias Brunner
+ * HSR 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.
+ */
+
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <errno.h>
+
+#include "command.h"
+
+CALLBACK(counters_kv, int,
+	void *null, vici_res_t *res, char *name, void *value, int len)
+{
+	if (chunk_printable(chunk_create(value, len), NULL, ' '))
+	{
+		printf("  %-22s: %.*s\n", name, len, value);
+	}
+	return 0;
+}
+
+CALLBACK(conns_sn, int,
+	void *null, vici_res_t *res, char *name)
+{
+	printf("%s:\n", strlen(name) ? name : "global");
+	return vici_parse_cb(res, NULL, counters_kv, NULL, NULL);
+}
+
+CALLBACK(counters_sn, int,
+	void *null, vici_res_t *res, char *name)
+{
+	return vici_parse_cb(res, conns_sn, NULL, NULL, NULL);
+}
+
+static int counters(vici_conn_t *conn)
+{
+	vici_req_t *req;
+	vici_res_t *res;
+	command_format_options_t format = COMMAND_FORMAT_NONE;
+	char *arg, *name = NULL;
+	int ret;
+	bool all = FALSE, reset = FALSE;
+
+	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 'n':
+				name = arg;
+				continue;
+			case 'a':
+				all = TRUE;
+				continue;
+			case 'R':
+				reset = TRUE;
+				continue;
+			case EOF:
+				break;
+			default:
+				return command_usage("invalid --counters option");
+		}
+		break;
+	}
+	if (reset)
+	{
+		req = vici_begin("reset-counters");
+	}
+	else
+	{
+		req = vici_begin("get-counters");
+	}
+	if (all)
+	{
+		vici_add_key_valuef(req, "all", "yes");
+	}
+	else if (name)
+	{
+		vici_add_key_valuef(req, "name", "%s", name);
+	}
+
+	res = vici_submit(req, conn);
+	if (!res)
+	{
+		ret = errno;
+		fprintf(stderr, "%s-counters request failed: %s\n",
+				reset ? "reset" : "get", strerror(errno));
+		return ret;
+	}
+	if (format & COMMAND_FORMAT_RAW)
+	{
+		vici_dump(res, "counters reply", format & COMMAND_FORMAT_PRETTY,
+				  stdout);
+	}
+	else
+	{
+		if (streq(vici_find_str(res, "no", "success"), "yes"))
+		{
+			if (reset)
+			{
+				printf("reset-counters completed successfully\n");
+			}
+			else if (vici_parse_cb(res, counters_sn, NULL, NULL, NULL) != 0)
+			{
+				fprintf(stderr, "parsing get-counters reply failed: %s\n",
+						strerror(errno));
+			}
+		}
+		else
+		{
+			fprintf(stderr, "%s-counters failed: %s\n", reset ? "reset" : "get",
+					vici_find_str(res, "", "errmsg"));
+			ret = 1;
+		}
+	}
+	vici_free_res(res);
+	return 0;
+}
+
+/**
+ * Register the command.
+ */
+static void __attribute__ ((constructor))reg()
+{
+	command_register((command_t) {
+		counters, 'c', "counters", "list or reset IKE event counters",
+		{"[--name <name>|--all] [--reset] [--raw|--pretty]"},
+		{
+			{"help",		'h', 0, "show usage information"},
+			{"name",		'n', 1, "connection name, omit for global counters"},
+			{"all",			'a', 0, "get/reset counters for all tracked connections"},
+			{"reset",		'R', 0, "reset the counters"},
+			{"raw",			'r', 0, "dump raw response message"},
+			{"pretty",		'P', 0, "dump raw response message in pretty print"},
+		}
+	});
+}