mirror of
https://github.com/mfontanini/libtins
synced 2026-01-23 02:35:57 +01:00
242 lines
8.1 KiB
C++
242 lines
8.1 KiB
C++
/*
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* libtins is a net packet wrapper library for crafting and
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* interpreting sniffed packets.
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*
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* Copyright (C) 2011 Nasel
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdexcept>
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#include <cassert>
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#include "endianness.h"
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#include "dhcp.h"
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#include "ethernetII.h"
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#include "ipaddress.h"
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using std::string;
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using std::list;
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using std::runtime_error;
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namespace Tins {
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// Magic cookie: uint32_t.
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DHCP::DHCP() : _size(sizeof(uint32_t)) {
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opcode(BOOTREQUEST);
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htype(1); //ethernet
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hlen(EthernetII::address_type::address_size);
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}
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DHCP::DHCP(const uint8_t *buffer, uint32_t total_sz)
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: BootP(buffer, total_sz, 0), _size(sizeof(uint32_t))
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{
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buffer += BootP::header_size() - vend().size();
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total_sz -= BootP::header_size() - vend().size();
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uint8_t args[2] = {0};
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if(total_sz < sizeof(uint32_t) || *(uint32_t*)buffer != Endian::host_to_be<uint32_t>(0x63825363))
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throw std::runtime_error("Not enough size for a DHCP header in the buffer.");
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buffer += sizeof(uint32_t);
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total_sz -= sizeof(uint32_t);
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while(total_sz) {
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for(unsigned i(0); i < 2; ++i) {
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args[i] = *(buffer++);
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total_sz--;
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if(args[0] == END || args[0] == PAD) {
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args[1] = 0;
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i = 2;
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}
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else if(!total_sz)
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throw std::runtime_error("Not enough size for a DHCP header in the buffer.");
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}
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if(total_sz < args[1])
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throw std::runtime_error("Not enough size for a DHCP header in the buffer.");
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add_option(dhcp_option((Options)args[0], args[1], buffer));
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buffer += args[1];
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total_sz -= args[1];
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}
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}
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void DHCP::add_option(const dhcp_option &option) {
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_options.push_back(option);
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_size += option.data_size() + (sizeof(uint8_t) << 1);
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}
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const DHCP::dhcp_option *DHCP::search_option(Options opt) const {
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for(options_type::const_iterator it = _options.begin(); it != _options.end(); ++it) {
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if(it->option() == opt)
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return &(*it);
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}
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return 0;
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}
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void DHCP::type(Flags type) {
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uint8_t int_type = type;
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add_option(dhcp_option(DHCP_MESSAGE_TYPE, sizeof(uint8_t), &int_type));
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}
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void DHCP::end() {
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add_option(dhcp_option(DHCP_MESSAGE_TYPE));
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}
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uint8_t DHCP::type() const {
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return generic_search(DHCP_MESSAGE_TYPE, type2type<uint8_t>());
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}
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void DHCP::server_identifier(ipaddress_type ip) {
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uint32_t ip_int = ip;
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add_option(dhcp_option(DHCP_SERVER_IDENTIFIER, sizeof(uint32_t), (const uint8_t*)&ip_int));
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}
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DHCP::ipaddress_type DHCP::server_identifier() const {
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return generic_search(DHCP_SERVER_IDENTIFIER, type2type<ipaddress_type>());
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}
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void DHCP::lease_time(uint32_t time) {
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time = Endian::host_to_be(time);
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add_option(dhcp_option(DHCP_LEASE_TIME, sizeof(uint32_t), (const uint8_t*)&time));
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}
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uint32_t DHCP::lease_time() const {
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return Endian::host_to_be(generic_search(DHCP_LEASE_TIME, type2type<uint32_t>()));
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}
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void DHCP::renewal_time(uint32_t time) {
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time = Endian::host_to_be(time);
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add_option(dhcp_option(DHCP_RENEWAL_TIME, sizeof(uint32_t), (const uint8_t*)&time));
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}
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uint32_t DHCP::renewal_time() const {
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return Endian::host_to_be(generic_search(DHCP_RENEWAL_TIME, type2type<uint32_t>()));
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}
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void DHCP::subnet_mask(ipaddress_type mask) {
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uint32_t mask_int = mask;
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add_option(dhcp_option(SUBNET_MASK, sizeof(uint32_t), (const uint8_t*)&mask_int));
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}
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DHCP::ipaddress_type DHCP::subnet_mask() const {
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return generic_search(SUBNET_MASK, type2type<ipaddress_type>());
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}
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void DHCP::routers(const list<ipaddress_type> &routers) {
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serialization_type buffer = serialize_list(routers);
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add_option(dhcp_option(ROUTERS, buffer.begin(), buffer.end()));
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}
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std::list<DHCP::ipaddress_type> DHCP::routers() const {
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return generic_search(ROUTERS, type2type<std::list<ipaddress_type> >());
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}
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void DHCP::domain_name_servers(const list<ipaddress_type> &dns) {
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serialization_type buffer = serialize_list(dns);
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add_option(dhcp_option(DOMAIN_NAME_SERVERS, buffer.begin(), buffer.end()));
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}
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std::list<DHCP::ipaddress_type> DHCP::domain_name_servers() const {
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return generic_search(DOMAIN_NAME_SERVERS, type2type<std::list<ipaddress_type> >());
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}
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void DHCP::broadcast(ipaddress_type addr) {
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uint32_t int_addr = addr;
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add_option(dhcp_option(BROADCAST_ADDRESS, sizeof(uint32_t), (uint8_t*)&int_addr));
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}
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DHCP::ipaddress_type DHCP::broadcast() const {
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return generic_search(BROADCAST_ADDRESS, type2type<ipaddress_type>());
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}
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void DHCP::requested_ip(ipaddress_type addr) {
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uint32_t int_addr = addr;
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add_option(dhcp_option(DHCP_REQUESTED_ADDRESS, sizeof(uint32_t), (uint8_t*)&int_addr));
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}
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DHCP::ipaddress_type DHCP::requested_ip() const {
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return generic_search(DHCP_REQUESTED_ADDRESS, type2type<ipaddress_type>());
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}
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void DHCP::domain_name(const string &name) {
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add_option(dhcp_option(DOMAIN_NAME, name.size(), (const uint8_t*)name.c_str()));
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}
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std::string DHCP::domain_name() const {
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return generic_search(DOMAIN_NAME, type2type<std::string>());
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}
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void DHCP::rebind_time(uint32_t time) {
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time = Endian::host_to_be(time);
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add_option(dhcp_option(DHCP_REBINDING_TIME, sizeof(uint32_t), (uint8_t*)&time));
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}
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uint32_t DHCP::rebind_time() const {
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return Endian::host_to_be(generic_search(DHCP_REBINDING_TIME, type2type<uint32_t>()));
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}
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PDU::serialization_type DHCP::serialize_list(const list<ipaddress_type> &ip_list) {
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serialization_type buffer(ip_list.size() * sizeof(uint32_t));
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uint32_t *ptr = (uint32_t*)&buffer[0];
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for(list<ipaddress_type>::const_iterator it = ip_list.begin(); it != ip_list.end(); ++it)
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*(ptr++) = *it;
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return buffer;
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}
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uint32_t DHCP::header_size() const {
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return BootP::header_size() - vend().size() + _size;
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}
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void DHCP::write_serialization(uint8_t *buffer, uint32_t total_sz, const PDU *parent) {
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assert(total_sz >= header_size());
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if(_size) {
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vend_type &result(BootP::vend());
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result.resize(_size);
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uint8_t *ptr = &result[0] + sizeof(uint32_t);
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// Magic cookie
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*((uint32_t*)&result[0]) = Endian::host_to_be<uint32_t>(0x63825363);
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for(options_type::const_iterator it = _options.begin(); it != _options.end(); ++it) {
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*(ptr++) = it->option();
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*(ptr++) = it->data_size();
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std::copy(it->data_ptr(), it->data_ptr() + it->data_size(), ptr);
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ptr += it->data_size();
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}
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}
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BootP::write_serialization(buffer, total_sz, parent);
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}
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std::list<DHCP::ipaddress_type> DHCP::generic_search(Options opt, type2type<std::list<ipaddress_type> >) const {
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const dhcp_option *option = search_option(opt);
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if(!option)
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throw option_not_found();
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const uint32_t *ptr = (const uint32_t*)option->data_ptr();
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uint32_t len = option->data_size();
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if((len % sizeof(uint32_t)) != 0)
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throw option_not_found();
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std::list<ipaddress_type> container;
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while(len) {
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container.push_back(ipaddress_type(*(ptr++)));
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len -= sizeof(uint32_t);
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}
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return container;
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}
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std::string DHCP::generic_search(Options opt, type2type<std::string>) const {
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const dhcp_option *option = search_option(opt);
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if(!option)
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throw option_not_found();
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return string(option->data_ptr(), option->data_ptr() + option->data_size());
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}
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DHCP::ipaddress_type DHCP::generic_search(Options opt, type2type<ipaddress_type>) const {
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return ipaddress_type(generic_search(opt, type2type<uint32_t>()));
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}
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}
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