ibrdtn/ibrdtn/security/MutualSerializer.cpp

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#include "ibrdtn/security/MutualSerializer.h"
#include "ibrdtn/data/Bundle.h"
#include "ibrdtn/data/Block.h"
#include "ibrdtn/data/EID.h"
#include "ibrdtn/security/SecurityBlock.h"
#include <ibrcommon/Logger.h>

#include <arpa/inet.h>
#include <endian.h>

#ifdef __DEVELOPMENT_ASSERTIONS__
#include <cassert>
#endif

// needed for Debian Lenny, whichs older clibrary does not provide htobe64(x)
#include <bits/byteswap.h>
#if __BYTE_ORDER == __LITTLE_ENDIAN
#define _ibrdtn_htobe64(x)  __bswap_64(x)
#else
#define _ibrdtn_htobe64(x) (x)
#endif

namespace dtn
{
        namespace security
        {
                MutualSerializer::MutualSerializer(std::ostream& stream, const dtn::data::Block *ignore)
                 : dtn::data::DefaultSerializer(stream), _ignore(ignore), _ignore_previous_bundles(ignore != NULL)
                 {
                 }

                MutualSerializer::~MutualSerializer()
                {
                }

                dtn::data::Serializer& MutualSerializer::operator<<(const dtn::data::PrimaryBlock &obj)
                {
                        // we want to ignore all block before "ignore"
                        if (_ignore != NULL) _ignore_previous_bundles = true;

                        // write unpacked primary block
                        // bundle version
                        _stream << dtn::data::BUNDLE_VERSION;

                        // processing flags
                        (*this) << dtn::data::SDNV(obj._procflags & 0x0000000007C1BE);

                        // length of header
                        (*this) << dtn::data::SDNV(getLength(obj));

                        // dest, source, report to id
                        (*this) << obj._destination;
                        (*this) << obj._source;
                        (*this) << obj._reportto;

                        // timestamp
                        (*this) << dtn::data::SDNV(obj._timestamp);
                        (*this) << dtn::data::SDNV(obj._sequencenumber);

                        // lifetime
                        (*this) << dtn::data::SDNV(obj._lifetime);

                        return *this;
                }

                dtn::data::Serializer& MutualSerializer::operator<<(const dtn::data::Block &obj)
                {
                        // do we ignore the current block?
                        if (_ignore_previous_bundles && (&obj != _ignore))
                        {
                                return *this;
                        }
                        else
                        {
                                // process all following bundles
                                _ignore_previous_bundles = false;
                        }

                        // only take payload related blocks
                        if (obj.getType() != dtn::data::PayloadBlock::BLOCK_TYPE
                                && obj.getType() != SecurityBlock::PAYLOAD_INTEGRITY_BLOCK
                                && obj.getType() != SecurityBlock::PAYLOAD_CONFIDENTIAL_BLOCK)
                        {
                                return *this;
                        }

                        _stream << obj._blocktype;
                        (*this) << dtn::data::SDNV(obj._procflags & 0x0000000000000077);

#ifdef __DEVELOPMENT_ASSERTIONS__
                        // test: BLOCK_CONTAINS_EIDS => (_eids.size() > 0)
                        assert(!obj.get(dtn::data::Block::BLOCK_CONTAINS_EIDS) || (obj._eids.size() > 0));
#endif

                        if (obj.get(dtn::data::Block::BLOCK_CONTAINS_EIDS))
                                for (std::list<dtn::data::EID>::const_iterator it = obj._eids.begin(); it != obj._eids.end(); it++)
                                        (*this) << (*it);

                        try {
                                const dtn::security::SecurityBlock &sb = dynamic_cast<const dtn::security::SecurityBlock&>(obj);
                                
                                if ( (sb.getType() == SecurityBlock::PAYLOAD_INTEGRITY_BLOCK) || (sb.getType() == SecurityBlock::PAYLOAD_CONFIDENTIAL_BLOCK) )
                                {
                                        // write size of the payload in the block
                                        (*this) << dtn::data::SDNV(sb.getLength_mutable());

                                        sb.serialize_mutable_without_security_result(*this);
                                }
                        } catch (const std::bad_cast&) {
                                // write size of the payload in the block
                                (*this) << dtn::data::SDNV(obj.getLength());

                                // write the payload of the block
                                obj.serialize(_stream);
                        };

                        return (*this);
                }

                size_t MutualSerializer::getLength(const dtn::data::Bundle&)
                {
#ifdef __DEVELOPMENT_ASSERTIONS__
                        assert(false);
#endif
                        return 0;
                }

                size_t MutualSerializer::getLength(const dtn::data::PrimaryBlock &obj) const
                {
                        // predict the block length
                        // length in bytes
                        // starting with the fields after the length field

                        // dest id length
                        u_int32_t length = 4;
                        // dest id
                        length += obj._destination.getString().size();
                        // source id length
                        length += 4;
                        // source id
                        length += obj._source.getString().size();
                        // report to id length
                        length += 4;
                        // report to id
                        length += obj._reportto.getString().size();
                        // creation time: 2*SDNV
                        length += 2*sdnv_size;
                        // lifetime: SDNV
                        length += sdnv_size;

                        IBRCOMMON_LOGGER_DEBUG_ex(ibrcommon::Logger::LOGGER_DEBUG) << "length: " << length << IBRCOMMON_LOGGER_ENDL;

                        return length;
                }

                size_t MutualSerializer::getLength(const dtn::data::Block &obj) const
                {
                        size_t len = 0;

                        len += sizeof(obj._blocktype);
                        // proc flags
                        len += sdnv_size;

#ifdef __DEVELOPMENT_ASSERTIONS__
                        // test: BLOCK_CONTAINS_EIDS => (_eids.size() > 0)
                        assert(!obj.get(dtn::data::Block::BLOCK_CONTAINS_EIDS) || (obj._eids.size() > 0));
#endif

                        if (obj.get(dtn::data::Block::BLOCK_CONTAINS_EIDS))
                                for (std::list<dtn::data::EID>::const_iterator it = obj._eids.begin(); it != obj._eids.end(); it++)
                                        len += it->getString().size();

                        // size-field of the size of the payload in the block
                        len += sdnv_size;

                        try {
                                const dtn::security::SecurityBlock &sb = dynamic_cast<const dtn::security::SecurityBlock&>(obj);

                                // add size of the payload in the block
                                len += sb.getLength_mutable();
                        } catch (const std::bad_cast&) {
                                // add size of the payload in the block
                                len += obj.getLength();
                        };

                        return len;
                }


                dtn::data::Serializer& MutualSerializer::operator<<(const u_int32_t value)
                {
                        u_int32_t be = htonl(value);
                        _stream.write(reinterpret_cast<char*>(&be), sizeof(u_int32_t));
                        return *this;
                }

                dtn::data::Serializer& MutualSerializer::operator<<(const dtn::data::EID& value)
                {
                        dtn::data::BundleString bs(value.getString());
                        _stream << bs;

                        return *this;
                }

                dtn::data::Serializer& MutualSerializer::operator<<(const dtn::data::SDNV& value)
                {
                        // endianess muahahaha ...
                        // and now we are gcc centric, even older versions work
                        u_int64_t be = _ibrdtn_htobe64(value.getValue());
                        _stream.write(reinterpret_cast<char*>(&be), sizeof(u_int64_t));
                        return *this;
                }

                dtn::data::Serializer& MutualSerializer::operator<<(const dtn::security::SecurityBlock::TLVList& list)
                {
                        (*this) << dtn::data::SDNV(list.getLength());
                        _stream << list.toString();
                        return *this;
                }
        }
}