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/* routecheck, for libreswan
*
* Copyright (C) 2022 Andrew Cagney
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Library General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <https://www.gnu.org/licenses/lgpl-2.1.txt>.
*
* This library 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 Library General Public
* License for more details.
*/
#include <stdlib.h>
#include <getopt.h>
#include "lswtool.h"
#include "lswlog.h"
#include "addr_lookup.h"
#include "ip_address.h"
#include "ip_info.h"
#include "optarg.h"
enum opt {
OPT_EOF = -1,
OPT_FLAG = 0,
OPT_MISSING = ':',
OPT_INVALID = '?',
OPT_HELP = 'h',
OPT_VERBOSE = 'v',
OPT_DEBUG = 'd',
OPT_IPv4 = '4',
OPT_IPv6 = '6',
};
static struct optarg_family family;
static int show_source = false;
static int show_gateway = false;
static int show_destination = false;
const struct option optarg_options[] = {
{ "source", no_argument, &show_source, true, },
{ "gateway", no_argument, &show_gateway, true, },
{ "destination", no_argument, &show_destination, true, },
{ "debug", no_argument, NULL, OPT_DEBUG, },
{ "ipv4", no_argument, NULL, OPT_IPv4, },
{ "ipv6", no_argument, NULL, OPT_IPv6, },
{ "verbose", no_argument, NULL, OPT_VERBOSE, },
{0},
};
int main(int argc, char **argv)
{
struct logger *logger = tool_logger(argc, argv);
optarg_init(logger);
if (argc == 1) {
llog(WHACK_STREAM|NO_PREFIX, logger, "Usage:");
llog(WHACK_STREAM|NO_PREFIX, logger, " ipsec showroute [-4|-6] [--debug] [--source|--gateway|--destination] <destination>");
llog(WHACK_STREAM|NO_PREFIX, logger, "prints:");
llog(WHACK_STREAM|NO_PREFIX, logger, " <source-address> <gateway-address> <destination-address>");
llog(WHACK_STREAM|NO_PREFIX, logger, "for the given <destination>");
exit(1);
}
while (true) {
enum opt c = getopt_long(argc, argv, "vd46", optarg_options, &optarg_index);
if (c == -1) {
break;
}
switch (c) {
case OPT_DEBUG:
optarg_debug(true);
break;
case OPT_IPv4:
optarg_family(&family, &ipv4_info);
break;
case OPT_IPv6:
optarg_family(&family, &ipv4_info);
break;
case OPT_VERBOSE:
optarg_verbose(LEMPTY);
break;
case OPT_EOF:
break;
case OPT_FLAG:
/* flag updated */
break;
case OPT_INVALID:
llog(ERROR_STREAM, logger, "invalid option: %s", argv[optarg_index]);
exit(1);
case OPT_MISSING:
llog(ERROR_STREAM, logger, "missing parameter: %s", argv[optarg_index]);
exit(1);
default:
bad_case(c);
}
}
if (optind == argc) {
llog(ERROR_STREAM, logger, "missing destination");
exit(1);
}
if (optind + 1 < argc) {
llog(ERROR_STREAM, logger, "extra parameter %s", argv[optind + 1]);
exit(1);
}
if (!show_source && !show_gateway && !show_destination) {
show_source = show_gateway = show_destination = true;
}
ip_address dst;
err_t e = ttoaddress_dns(shunk1(argv[optind]), family.type, &dst);
if (e != NULL) {
llog(WHACK_STREAM, logger, "%s: %s", argv[1], e);
exit(1);
}
struct ip_route route;
switch (get_route(dst, &route, logger)) {
case ROUTE_SUCCESS:
{
LLOG_JAMBUF(WHACK_STREAM|NO_PREFIX, logger, buf) {
const char *sep = "";
if (show_source) {
jam_string(buf, sep); sep = " ";
jam_address(buf, &route.source);
}
if (show_gateway) {
jam_string(buf, sep); sep = " ";
jam_address(buf, &route.gateway);
}
if (show_destination) {
jam_string(buf, sep); sep = " ";
jam_address(buf, &dst);
}
}
exit(0);
}
case ROUTE_GATEWAY_FAILED:
{
address_buf ab;
llog(ERROR_STREAM, logger, "%s: gateway failed",
str_address(&dst, &ab));
exit(1);
}
case ROUTE_SOURCE_FAILED:
{
address_buf ab;
llog(ERROR_STREAM, logger, "%s: source failed",
str_address(&dst, &ab));
exit(1);
}
case ROUTE_FATAL:
{
address_buf ab;
llog(ERROR_STREAM, logger, "%s: fatal",
str_address(&dst, &ab));
exit(1);
}
}
exit(1);
}
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