mirror of
https://github.com/mfontanini/libtins
synced 2026-01-23 10:45:57 +01:00
237 lines
7.3 KiB
C++
237 lines
7.3 KiB
C++
/*
|
|
* Copyright (c) 2014, Matias Fontanini
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are
|
|
* met:
|
|
*
|
|
* * Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* * Redistributions in binary form must reproduce the above
|
|
* copyright notice, this list of conditions and the following disclaimer
|
|
* in the documentation and/or other materials provided with the
|
|
* distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
*/
|
|
|
|
#include <stdexcept>
|
|
#include <cstring>
|
|
#ifdef TINS_DEBUG
|
|
#include <cassert>
|
|
#endif
|
|
#ifndef WIN32
|
|
#include <netinet/in.h>
|
|
#endif
|
|
#include "rawpdu.h"
|
|
#include "utils.h"
|
|
#include "exceptions.h"
|
|
#include "icmp.h"
|
|
|
|
namespace Tins {
|
|
ICMP::ICMP(Flags flag)
|
|
: _orig_timestamp_or_address_mask(), _recv_timestamp(), _trans_timestamp()
|
|
{
|
|
std::memset(&_icmp, 0, sizeof(icmphdr));
|
|
type(flag);
|
|
}
|
|
|
|
ICMP::ICMP(const uint8_t *buffer, uint32_t total_sz)
|
|
{
|
|
if(total_sz < sizeof(icmphdr))
|
|
throw malformed_packet();
|
|
std::memcpy(&_icmp, buffer, sizeof(icmphdr));
|
|
buffer += sizeof(icmphdr);
|
|
total_sz -= sizeof(icmphdr);
|
|
uint32_t uint32_t_buffer = 0;
|
|
if(type() == TIMESTAMP_REQUEST || type() == TIMESTAMP_REPLY) {
|
|
if(total_sz < sizeof(uint32_t) * 3)
|
|
throw malformed_packet();
|
|
memcpy(&uint32_t_buffer, buffer, sizeof(uint32_t));
|
|
original_timestamp(uint32_t_buffer);
|
|
memcpy(&uint32_t_buffer, buffer + sizeof(uint32_t), sizeof(uint32_t));
|
|
receive_timestamp(uint32_t_buffer);
|
|
memcpy(&uint32_t_buffer, buffer + 2 * sizeof(uint32_t), sizeof(uint32_t));
|
|
transmit_timestamp(uint32_t_buffer);
|
|
total_sz -= sizeof(uint32_t) * 3;
|
|
buffer += sizeof(uint32_t) * 3;
|
|
}
|
|
else if(type() == ADDRESS_MASK_REQUEST || type() == ADDRESS_MASK_REPLY) {
|
|
if(total_sz < sizeof(uint32_t))
|
|
throw malformed_packet();
|
|
memcpy(&uint32_t_buffer, buffer, sizeof(uint32_t));
|
|
address_mask(address_type(uint32_t_buffer));
|
|
total_sz -= sizeof(uint32_t);
|
|
buffer += sizeof(uint32_t);
|
|
}
|
|
if(total_sz)
|
|
inner_pdu(new RawPDU(buffer, total_sz));
|
|
}
|
|
|
|
void ICMP::code(uint8_t new_code) {
|
|
_icmp.code = new_code;
|
|
}
|
|
|
|
void ICMP::type(Flags new_type) {
|
|
_icmp.type = new_type;
|
|
}
|
|
|
|
void ICMP::checksum(uint16_t new_check) {
|
|
_icmp.check = Endian::host_to_be(new_check);
|
|
}
|
|
|
|
void ICMP::id(uint16_t new_id) {
|
|
_icmp.un.echo.id = Endian::host_to_be(new_id);
|
|
}
|
|
|
|
void ICMP::sequence(uint16_t new_seq) {
|
|
_icmp.un.echo.sequence = Endian::host_to_be(new_seq);
|
|
}
|
|
|
|
void ICMP::gateway(address_type new_gw) {
|
|
_icmp.un.gateway = Endian::host_to_be(static_cast<uint32_t>(new_gw));
|
|
}
|
|
|
|
void ICMP::mtu(uint16_t new_mtu) {
|
|
_icmp.un.frag.mtu = Endian::host_to_be(new_mtu);
|
|
}
|
|
|
|
void ICMP::pointer(uint8_t new_pointer) {
|
|
_icmp.un.pointer = new_pointer;
|
|
}
|
|
|
|
void ICMP::original_timestamp(uint32_t new_timestamp) {
|
|
_orig_timestamp_or_address_mask = Endian::host_to_be(new_timestamp);
|
|
}
|
|
|
|
void ICMP::receive_timestamp(uint32_t new_timestamp) {
|
|
_recv_timestamp = Endian::host_to_be(new_timestamp);
|
|
}
|
|
|
|
void ICMP::transmit_timestamp(uint32_t new_timestamp) {
|
|
_trans_timestamp = Endian::host_to_be(new_timestamp);
|
|
}
|
|
|
|
void ICMP::address_mask(address_type new_mask) {
|
|
_orig_timestamp_or_address_mask = Endian::host_to_be(static_cast<uint32_t>(new_mask));
|
|
}
|
|
|
|
uint32_t ICMP::header_size() const {
|
|
uint32_t extra = 0;
|
|
if(type() == TIMESTAMP_REQUEST || type() == TIMESTAMP_REPLY)
|
|
extra = sizeof(uint32_t) * 3;
|
|
else if(type() == ADDRESS_MASK_REQUEST || type() == ADDRESS_MASK_REPLY)
|
|
extra = sizeof(uint32_t);
|
|
return sizeof(icmphdr) + extra;
|
|
}
|
|
|
|
void ICMP::set_echo_request(uint16_t id, uint16_t seq) {
|
|
type(ECHO_REQUEST);
|
|
this->id(id);
|
|
sequence(seq);
|
|
}
|
|
|
|
void ICMP::set_echo_reply(uint16_t id, uint16_t seq) {
|
|
type(ECHO_REPLY);
|
|
this->id(id);
|
|
sequence(seq);
|
|
}
|
|
|
|
void ICMP::set_info_request(uint16_t id, uint16_t seq) {
|
|
type(INFO_REQUEST);
|
|
code(0);
|
|
this->id(id);
|
|
sequence(seq);
|
|
}
|
|
|
|
void ICMP::set_info_reply(uint16_t id, uint16_t seq) {
|
|
type(INFO_REPLY);
|
|
code(0);
|
|
this->id(id);
|
|
sequence(seq);
|
|
}
|
|
|
|
void ICMP::set_dest_unreachable() {
|
|
type(DEST_UNREACHABLE);
|
|
}
|
|
|
|
void ICMP::set_time_exceeded(bool ttl_exceeded) {
|
|
type(TIME_EXCEEDED);
|
|
code((ttl_exceeded) ? 0 : 1);
|
|
}
|
|
|
|
void ICMP::set_param_problem(bool set_pointer, uint8_t bad_octet) {
|
|
type(PARAM_PROBLEM);
|
|
if(set_pointer) {
|
|
code(0);
|
|
pointer(bad_octet);
|
|
}
|
|
else
|
|
code(1);
|
|
}
|
|
|
|
void ICMP::set_source_quench() {
|
|
type(SOURCE_QUENCH);
|
|
}
|
|
|
|
void ICMP::set_redirect(uint8_t icode, address_type address) {
|
|
type(REDIRECT);
|
|
code(icode);
|
|
gateway(address);
|
|
}
|
|
|
|
void ICMP::write_serialization(uint8_t *buffer, uint32_t total_sz, const PDU *) {
|
|
#ifdef TINS_DEBUG
|
|
assert(total_sz >= sizeof(icmphdr));
|
|
#endif
|
|
|
|
uint32_t uint32_t_buffer;
|
|
if(type() == TIMESTAMP_REQUEST || type() == TIMESTAMP_REPLY) {
|
|
uint32_t_buffer = original_timestamp();
|
|
memcpy(buffer + sizeof(icmphdr), &uint32_t_buffer, sizeof(uint32_t));
|
|
uint32_t_buffer = receive_timestamp();
|
|
memcpy(buffer + sizeof(icmphdr) + sizeof(uint32_t), &uint32_t_buffer, sizeof(uint32_t));
|
|
uint32_t_buffer = transmit_timestamp();
|
|
memcpy(buffer + sizeof(icmphdr) + 2 * sizeof(uint32_t), &uint32_t_buffer, sizeof(uint32_t));
|
|
}
|
|
else if(type() == ADDRESS_MASK_REQUEST || type() == ADDRESS_MASK_REPLY) {
|
|
uint32_t_buffer = address_mask();
|
|
memcpy(buffer + sizeof(icmphdr), &uint32_t_buffer, sizeof(uint32_t));
|
|
}
|
|
// checksum calc
|
|
_icmp.check = 0;
|
|
memcpy(buffer, &_icmp, sizeof(icmphdr));
|
|
uint32_t checksum = Utils::do_checksum(buffer, buffer + total_sz);
|
|
|
|
while (checksum >> 16)
|
|
checksum = (checksum & 0xffff) + (checksum >> 16);
|
|
|
|
_icmp.check = Endian::host_to_be<uint16_t>(~checksum);
|
|
memcpy(buffer + 2, &_icmp.check, sizeof(uint16_t));
|
|
}
|
|
|
|
bool ICMP::matches_response(const uint8_t *ptr, uint32_t total_sz) const {
|
|
if(total_sz < sizeof(icmphdr))
|
|
return false;
|
|
const icmphdr *icmp_ptr = (const icmphdr*)ptr;
|
|
if((_icmp.type == ECHO_REQUEST && icmp_ptr->type == ECHO_REPLY) ||
|
|
(_icmp.type == TIMESTAMP_REQUEST && icmp_ptr->type == TIMESTAMP_REPLY) ||
|
|
(_icmp.type == ADDRESS_MASK_REQUEST && icmp_ptr->type == ADDRESS_MASK_REPLY)) {
|
|
return icmp_ptr->un.echo.id == _icmp.un.echo.id && icmp_ptr->un.echo.sequence == _icmp.un.echo.sequence;
|
|
}
|
|
return false;
|
|
}
|
|
} // namespace Tins
|