dht_direct_response_alert::dht_direct_response_alert(
aux::stack_allocator& alloc, void* userdata_
, udp::endpoint const& addr_, bdecode_node const& response)
: userdata(userdata_), addr(addr_), m_alloc(alloc)
, m_response_idx(alloc.copy_buffer(response.data_section().first, response.data_section().second))
, m_response_size(response.data_section().second)
{}
bool item::assign(bdecode_node const& v, span<char const> salt
, sequence_number const seq, public_key const& pk, signature const& sig)
{
TORRENT_ASSERT(v.data_section().size() <= 1000);
if (!verify_mutable_item(v.data_section(), salt, seq, pk, sig))
return false;
m_pk = pk;
m_sig = sig;
if (salt.size() > 0)
m_salt.assign(salt.data(), salt.size());
else
m_salt.clear();
m_seq = seq;
m_mutable = true;
m_value = v;
return true;
}
void get_item::got_data(bdecode_node const& v,
public_key const& pk,
sequence_number const seq,
signature const& sig)
{
// we received data!
// if no data_callback, we needn't care about the data we get.
// only put_immutable_item no data_callback
if (!m_data_callback) return;
// for get_immutable_item
if (m_immutable)
{
// If m_data isn't empty, we should have post alert.
if (!m_data.empty()) return;
sha1_hash incoming_target = item_target_id(v.data_section());
if (incoming_target != target()) return;
m_data.assign(v);
// There can only be one true immutable item with a given id
// Now that we've got it and the user doesn't want to do a put
// there's no point in continuing to query other nodes
m_data_callback(m_data, true);
done();
return;
}
// immutable data should have been handled before this line, only mutable
// data can reach here, which means pk, sig and seq must be valid.
std::string const salt_copy(m_data.salt());
sha1_hash const incoming_target = item_target_id(salt_copy, pk);
if (incoming_target != target()) return;
// this is mutable data. If it passes the signature
// check, remember it. Just keep the version with
// the highest sequence number.
if (m_data.empty() || m_data.seq() < seq)
{
if (!m_data.assign(v, salt_copy, seq, pk, sig))
return;
// for get_item, we should call callback when we get data,
// even if the date is not authoritative, we can update later.
// so caller can get response ASAP without waiting transaction
// time-out (15 seconds).
// for put_item, the callback function will do nothing
// if the data is non-authoritative.
m_data_callback(m_data, false);
}
}
bool item::assign(bdecode_node const& v
, std::pair<char const*, int> salt
, boost::uint64_t seq, char const* pk, char const* sig)
{
TORRENT_ASSERT(v.data_section().second <= 1000);
if (pk && sig)
{
if (!verify_mutable_item(v.data_section(), salt, seq, pk, sig))
return false;
memcpy(m_pk.c_array(), pk, item_pk_len);
memcpy(m_sig.c_array(), sig, item_sig_len);
if (salt.second > 0)
m_salt.assign(salt.first, salt.second);
else
m_salt.clear();
m_seq = seq;
m_mutable = true;
}
else
m_mutable = false;
m_value = v;
return true;
}
