swanctl: Implement a list-pols command to query trap/shunt policies

src/swanctl/Makefile.am

@@ -7,6 +7,7 @@ swanctl_SOURCES = \
 	commands/install.c \
 	commands/version.c \
 	commands/list_sas.c \
+	commands/list_pols.c \
 	swanctl.c
 
 swanctl_LDADD = \

src/swanctl/commands/list_pols.c

@@ -0,0 +1,204 @@
+/*
+ * 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.
+ */
+
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <errno.h>
+
+#include "command.h"
+
+#include <collections/hashtable.h>
+
+/**
+ * Free hashtable with contained strings
+ */
+static void free_hashtable(hashtable_t *hashtable)
+{
+	enumerator_t *enumerator;
+	char *str;
+
+	enumerator = hashtable->create_enumerator(hashtable);
+	while (enumerator->enumerate(enumerator, NULL, &str))
+	{
+		free(str);
+	}
+	enumerator->destroy(enumerator);
+
+	hashtable->destroy(hashtable);
+}
+
+CALLBACK(policy_values, int,
+	hashtable_t *pol, vici_res_t *res, char *name, void *value, int len)
+{
+	chunk_t chunk;
+	char *str;
+
+	chunk = chunk_create(value, len);
+	if (chunk_printable(chunk, NULL, ' '))
+	{
+		if (asprintf(&str, "%.*s", len, value) >= 0)
+		{
+			free(pol->put(pol, name, str));
+		}
+	}
+	return 0;
+}
+
+CALLBACK(policy_list, int,
+	hashtable_t *pol, vici_res_t *res, char *name, void *value, int len)
+{
+	chunk_t chunk;
+	char *str;
+
+	chunk = chunk_create(value, len);
+	if (chunk_printable(chunk, NULL, ' '))
+	{
+		str = pol->get(pol, name);
+		if (asprintf(&str, "%s%s%.*s",
+					 str ?: "", str ? " " : "", len, value) >= 0)
+		{
+			free(pol->put(pol, name, str));
+		}
+	}
+	return 0;
+}
+
+CALLBACK(policies, int,
+	void *null, vici_res_t *res, char *name)
+{
+	hashtable_t *pol;
+	int ret;
+
+	pol = hashtable_create(hashtable_hash_str, hashtable_equals_str, 1);
+	ret = vici_parse_cb(res, NULL, policy_values, policy_list, pol);
+
+	printf("%s, %s\n", name, pol->get(pol, "mode"));
+	printf("  local:  %s\n", pol->get(pol, "local-ts"));
+	printf("  remote: %s\n", pol->get(pol, "remote-ts"));
+
+	free_hashtable(pol);
+	return ret;
+}
+
+CALLBACK(list_cb, void,
+	bool *raw, char *name, vici_res_t *res)
+{
+	if (*raw)
+	{
+		vici_dump(res, "list-policy event", stdout);
+	}
+	else
+	{
+		if (vici_parse_cb(res, policies, NULL, NULL, NULL) != 0)
+		{
+			fprintf(stderr, "parsing policy event failed: %s\n", strerror(errno));
+		}
+	}
+}
+
+static int list_pols(vici_conn_t *conn)
+{
+	vici_req_t *req;
+	vici_res_t *res;
+	bool raw = FALSE, trap = FALSE, drop = FALSE, pass = FALSE;
+	char *arg, *child = NULL;
+
+	while (TRUE)
+	{
+		switch (command_getopt(&arg))
+		{
+			case 'h':
+				return command_usage(NULL);
+			case 'c':
+				child = arg;
+				continue;
+			case 't':
+				trap = TRUE;
+				continue;
+			case 'd':
+				drop = TRUE;
+				continue;
+			case 'p':
+				pass = TRUE;
+				continue;
+			case 'r':
+				raw = TRUE;
+				continue;
+			case EOF:
+				break;
+			default:
+				return command_usage("invalid --list-pols option");
+		}
+		break;
+	}
+	if (!trap && !drop && !pass)
+	{
+		trap = drop = pass = TRUE;
+	}
+	if (vici_register(conn, "list-policy", list_cb, &raw) != 0)
+	{
+		fprintf(stderr, "registering for policies failed: %s\n",
+				strerror(errno));
+		return errno;
+	}
+	req = vici_begin("list-policies");
+	if (child)
+	{
+		vici_add_key_valuef(req, "child", "%s", child);
+	}
+	if (trap)
+	{
+		vici_add_key_valuef(req, "trap", "yes");
+	}
+	if (drop)
+	{
+		vici_add_key_valuef(req, "drop", "yes");
+	}
+	if (pass)
+	{
+		vici_add_key_valuef(req, "pass", "yes");
+	}
+	res = vici_submit(req, conn);
+	if (!res)
+	{
+		fprintf(stderr, "list-policies request failed: %s\n", strerror(errno));
+		return errno;
+	}
+	if (raw)
+	{
+		vici_dump(res, "list-policies reply", stdout);
+	}
+	vici_free_res(res);
+	return 0;
+}
+
+/**
+ * Register the command.
+ */
+static void __attribute__ ((constructor))reg()
+{
+	command_register((command_t) {
+		list_pols, 'P', "list-pols", "list currently installed policies",
+		{"[--child <name>] [--trap] [--drop] [--pass] [--raw]"},
+		{
+			{"help",		'h', 0, "show usage information"},
+			{"child",		'c', 1, "filter policies by CHILD_SA config name"},
+			{"trap",		't', 0, "list trap policies"},
+			{"drop",		'd', 0, "list drop policies"},
+			{"pass",		'p', 0, "list bypass policies"},
+			{"raw",			'r', 0, "dump raw response message"},
+		}
+	});
+}