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traceroute.c
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traceroute.c
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// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) B.A.T.M.A.N. contributors:
*
* Andreas Langer <an.langer@gmx.de>, Marek Lindner <mareklindner@neomailbox.ch>
*
* License-Filename: LICENSES/preferred/GPL-2.0
*/
#include <netinet/in.h>
#include <netinet/if_ether.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <stddef.h>
#include <sys/select.h>
#include <sys/time.h>
#include "batadv_packet.h"
#include "main.h"
#include "functions.h"
#include "bat-hosts.h"
#include "icmp_helper.h"
#define TTL_MAX 50
#define NUM_PACKETS 3
static void traceroute_usage(void)
{
fprintf(stderr, "Usage: batctl [options] traceroute [parameters] mac|bat-host|host_name|IPv4_address \n");
fprintf(stderr, "parameters:\n");
fprintf(stderr, " \t -h print this help\n");
fprintf(stderr, " \t -n don't convert addresses to bat-host names\n");
fprintf(stderr, " \t -T don't try to translate mac to originator address\n");
}
static int traceroute(struct state *state, int argc, char **argv)
{
struct batadv_icmp_packet icmp_packet_out, icmp_packet_in;
struct bat_host *bat_host;
struct ether_addr *dst_mac = NULL;
struct timeval tv;
ssize_t read_len;
char *dst_string, *mac_string, *return_mac, dst_reached = 0;
int ret = EXIT_FAILURE, res, i;
int found_args = 1, optchar, seq_counter = 0, read_opt = USE_BAT_HOSTS;
double time_delta[NUM_PACKETS];
int disable_translate_mac = 0;
while ((optchar = getopt(argc, argv, "hnT")) != -1) {
switch (optchar) {
case 'h':
traceroute_usage();
return EXIT_SUCCESS;
case 'n':
read_opt &= ~USE_BAT_HOSTS;
found_args += 1;
break;
case 'T':
disable_translate_mac = 1;
found_args += 1;
break;
default:
traceroute_usage();
return EXIT_FAILURE;
}
}
if (argc <= found_args) {
fprintf(stderr, "Error - target mac address or bat-host name not specified\n");
traceroute_usage();
return EXIT_FAILURE;
}
check_root_or_die("batctl traceroute");
dst_string = argv[found_args];
bat_hosts_init(read_opt);
bat_host = bat_hosts_find_by_name(dst_string);
if (bat_host)
dst_mac = &bat_host->mac_addr;
if (!dst_mac) {
dst_mac = resolve_mac(dst_string);
if (!dst_mac) {
fprintf(stderr, "Error - mac address of the ping destination could not be resolved and is not a bat-host name: %s\n", dst_string);
goto out;
}
}
if (!disable_translate_mac)
dst_mac = translate_mac(state, dst_mac);
mac_string = ether_ntoa_long(dst_mac);
icmp_interfaces_init();
memset(&icmp_packet_out, 0, sizeof(icmp_packet_out));
memcpy(&icmp_packet_out.dst, dst_mac, ETH_ALEN);
icmp_packet_out.version = BATADV_COMPAT_VERSION;
icmp_packet_out.packet_type = BATADV_ICMP;
icmp_packet_out.msg_type = BATADV_ECHO_REQUEST;
icmp_packet_out.seqno = 0;
icmp_packet_out.reserved = 0;
printf("traceroute to %s (%s), %d hops max, %zu byte packets\n",
dst_string, mac_string, TTL_MAX, sizeof(icmp_packet_out));
for (icmp_packet_out.ttl = 1;
!dst_reached && icmp_packet_out.ttl < TTL_MAX;
icmp_packet_out.ttl++) {
return_mac = NULL;
bat_host = NULL;
for (i = 0; i < NUM_PACKETS; i++) {
icmp_packet_out.seqno = htons(++seq_counter);
time_delta[i] = 0.0;
res = icmp_interface_write(state,
(struct batadv_icmp_header *)&icmp_packet_out,
sizeof(icmp_packet_out));
if (res < 0) {
fprintf(stderr, "Error - can't send icmp packet: %s\n", strerror(-res));
continue;
}
read_packet:
start_timer();
tv.tv_sec = 2;
tv.tv_usec = 0;
read_len = icmp_interface_read((struct batadv_icmp_header *)&icmp_packet_in,
sizeof(icmp_packet_in), &tv);
if (read_len <= 0)
continue;
if ((size_t)read_len < sizeof(icmp_packet_in)) {
printf("Warning - dropping received packet as it is smaller than expected (%zu): %zd\n",
sizeof(icmp_packet_in), read_len);
continue;
}
/* after receiving an unexpected seqno we keep waiting for our answer */
if (htons(seq_counter) != icmp_packet_in.seqno)
goto read_packet;
switch (icmp_packet_in.msg_type) {
case BATADV_ECHO_REPLY:
dst_reached = 1;
/* fall through */
case BATADV_TTL_EXCEEDED:
time_delta[i] = end_timer();
if (!return_mac) {
return_mac = ether_ntoa_long((struct ether_addr *)&icmp_packet_in.orig);
if (read_opt & USE_BAT_HOSTS)
bat_host = bat_hosts_find_by_mac((char *)&icmp_packet_in.orig);
}
break;
case BATADV_DESTINATION_UNREACHABLE:
printf("%s: Destination Host Unreachable\n", dst_string);
goto out;
case BATADV_PARAMETER_PROBLEM:
fprintf(stderr, "Error - the batman adv kernel module version (%d) differs from ours (%d)\n",
icmp_packet_in.version, BATADV_COMPAT_VERSION);
fprintf(stderr, "Please make sure to use compatible versions!\n");
goto out;
default:
printf("Unknown message type %d len %zd received\n",
icmp_packet_in.msg_type, read_len);
break;
}
}
if (!bat_host)
printf("%2hhu: %s", icmp_packet_out.ttl,
(return_mac ? return_mac : "*"));
else
printf("%2hhu: %s (%s)",
icmp_packet_out.ttl,
bat_host->name, return_mac);
for (i = 0; i < NUM_PACKETS; i++) {
if (time_delta[i])
printf(" %.3f ms", time_delta[i]);
else
printf(" *");
}
printf("\n");
}
ret = EXIT_SUCCESS;
out:
icmp_interfaces_clean();
bat_hosts_free();
return ret;
}
COMMAND(SUBCOMMAND_MIF, traceroute, "tr",
COMMAND_FLAG_MESH_IFACE | COMMAND_FLAG_NETLINK, NULL,
"<destination> \ttraceroute another batman adv host via layer 2");