// send an outgoing message to a remote host, if addr is given, then message is sent via UDP
// return the number of bytes sent
size_t
net_ace::
send (id_t target, char const *msg, size_t size, const Addr *addr)
{
if (_active == false)
return 0;
// NOTE: it's possible that connection is already broken, yet still try to access connection
// (remote disconnect + local send), may crash. So mutex has to be used
// a TCP message
if (addr == NULL)
{
std::map<id_t, ConnectInfo>::iterator it;
timestamp_t now = this->getTimestamp ();
_conn_mutex.acquire ();
// need to check if stream object still exists, otherwise may crash
// (remote disconnection could already remove the connection)
if ((it = _id2conn.find (target)) != _id2conn.end ())
{
// TODO: perhaps actual send can be done outside of mutex (avoid locking too long?)
#ifdef VAST_USE_SSL
if (it->second.is_secure)
{
ACE_SSL_SOCK_Stream &stream = ((net_ace_handler *)(it->second.stream))->getSSLStream ();
size = stream.send_n (msg, size);
}
else
{
#endif
ACE_SOCK_Stream &stream = *((net_ace_handler *)(it->second.stream));
size = stream.send_n (msg, size);
#ifdef VAST_USE_SSL
}
#endif
// update the last accessed time for this connection
it->second.lasttime = now;
}
else
size = 0;
_conn_mutex.release ();
}
// a UDP message
else
{
// TODO: check if two threads accessing same data structure can occur
ACE_INET_Addr target_addr ((u_short)addr->publicIP.port, (ACE_UINT32)addr->publicIP.host);
size = _udp->send (msg, size, target_addr);
// NOTE: there's no time update for UDP connection, as there's no need for connection timeout
}
return size;
}
int method_datagram_t::connect_fd() {
const netaddr_t& addr = target_addr();
int fd = socket(addr.sa->sa_family, SOCK_DGRAM, 0);
if(fd < 0) {
throw exception_sys_t(log::error, errno, "socket: %m");
}
bq_fd_setup(fd);
if(bq_connect(fd, addr.sa, addr.sa_len, NULL) < 0) {
throw exception_sys_t(log::error, errno, "connect: %m");
}
return fd;
}
ICMPv6::ICMPv6(const uint8_t *buffer, uint32_t total_sz)
: _options_size(), reach_time(0), retrans_timer(0)
{
if(total_sz < sizeof(_header))
throw malformed_packet();
std::memcpy(&_header, buffer, sizeof(_header));
buffer += sizeof(_header);
total_sz -= sizeof(_header);
if(has_target_addr()) {
if(total_sz < ipaddress_type::address_size)
throw malformed_packet();
target_addr(buffer);
buffer += ipaddress_type::address_size;
total_sz -= ipaddress_type::address_size;
}
if(has_dest_addr()) {
if(total_sz < ipaddress_type::address_size)
throw malformed_packet();
dest_addr(buffer);
buffer += ipaddress_type::address_size;
total_sz -= ipaddress_type::address_size;
}
if(type() == ROUTER_ADVERT) {
if(total_sz < sizeof(uint32_t) * 2)
throw malformed_packet();
const uint32_t *ptr_32 = (const uint32_t*)buffer;
reach_time = *ptr_32++;
retrans_timer = *ptr_32++;
buffer += sizeof(uint32_t) * 2;
total_sz -= sizeof(uint32_t) * 2;
}
if(has_options())
parse_options(buffer, total_sz);
if(total_sz > 0)
inner_pdu(new RawPDU(buffer, total_sz));
}
udp::endpoint observer::target_ep() const
{
return udp::endpoint(target_addr(), m_port);
}
Dot11ControlTA::Dot11ControlTA(const address_type &dst_addr,
const address_type &target_address)
: Dot11Control(dst_addr)
{
target_addr(target_address);
}
void traversal_algorithm::add_entry(node_id const& id
, udp::endpoint const& addr, unsigned char const flags)
{
TORRENT_ASSERT(m_node.m_rpc.allocation_size() >= sizeof(find_data_observer));
auto o = new_observer(addr, id);
if (!o)
{
#ifndef TORRENT_DISABLE_LOGGING
if (get_node().observer() != nullptr)
{
get_node().observer()->log(dht_logger::traversal, "[%p] failed to allocate memory or observer. aborting!"
, static_cast<void*>(this));
}
#endif
done();
return;
}
if (id.is_all_zeros())
{
o->set_id(generate_random_id());
o->flags |= observer::flag_no_id;
}
o->flags |= flags;
TORRENT_ASSERT(libtorrent::dht::is_sorted(m_results.begin(), m_results.end()
, [this](observer_ptr const& lhs, observer_ptr const& rhs)
{ return compare_ref(lhs->id(), rhs->id(), m_target); }));
auto iter = std::lower_bound(m_results.begin(), m_results.end(), o
, [this](observer_ptr const& lhs, observer_ptr const& rhs)
{ return compare_ref(lhs->id(), rhs->id(), m_target); });
if (iter == m_results.end() || (*iter)->id() != id)
{
if (m_node.settings().restrict_search_ips
&& !(flags & observer::flag_initial))
{
#if TORRENT_USE_IPV6
if (o->target_addr().is_v6())
{
address_v6::bytes_type addr_bytes = o->target_addr().to_v6().to_bytes();
address_v6::bytes_type::const_iterator prefix_it = addr_bytes.begin();
std::uint64_t const prefix6 = detail::read_uint64(prefix_it);
if (m_peer6_prefixes.insert(prefix6).second)
goto add_result;
}
else
#endif
{
// mask the lower octet
std::uint32_t const prefix4
= o->target_addr().to_v4().to_ulong() & 0xffffff00;
if (m_peer4_prefixes.insert(prefix4).second)
goto add_result;
}
// we already have a node in this search with an IP very
// close to this one. We know that it's not the same, because
// it claims a different node-ID. Ignore this to avoid attacks
#ifndef TORRENT_DISABLE_LOGGING
dht_observer* logger = get_node().observer();
if (logger != nullptr && logger->should_log(dht_logger::traversal))
{
char hex_id[41];
aux::to_hex(o->id(), hex_id);
logger->log(dht_logger::traversal
, "[%p] traversal DUPLICATE node. id: %s addr: %s type: %s"
, static_cast<void*>(this), hex_id, print_address(o->target_addr()).c_str(), name());
}
#endif
return;
}
add_result:
TORRENT_ASSERT((o->flags & observer::flag_no_id)
|| std::none_of(m_results.begin(), m_results.end()
, [&id](observer_ptr const& ob) { return ob->id() == id; }));
#ifndef TORRENT_DISABLE_LOGGING
dht_observer* logger = get_node().observer();
if (logger != nullptr && logger->should_log(dht_logger::traversal))
{
char hex_id[41];
aux::to_hex(id, hex_id);
logger->log(dht_logger::traversal
, "[%p] ADD id: %s addr: %s distance: %d invoke-count: %d type: %s"
, static_cast<void*>(this), hex_id, print_endpoint(addr).c_str()
, distance_exp(m_target, id), m_invoke_count, name());
}
#endif
iter = m_results.insert(iter, o);
TORRENT_ASSERT(libtorrent::dht::is_sorted(m_results.begin(), m_results.end()
, [this](observer_ptr const& lhs, observer_ptr const& rhs)
{ return compare_ref(lhs->id(), rhs->id(), m_target); }));
}
if (m_results.size() > 100)
{
for (int i = 100; i < int(m_results.size()); ++i)
{
if ((m_results[i]->flags & (observer::flag_queried | observer::flag_failed | observer::flag_alive))
== observer::flag_queried)
{
// set the done flag on any outstanding queries to prevent them from
// calling finished() or failed()
m_results[i]->flags |= observer::flag_done;
TORRENT_ASSERT(m_invoke_count > 0);
--m_invoke_count;
}
#if TORRENT_USE_ASSERTS
m_results[i]->m_was_abandoned = true;
#endif
}
m_results.resize(100);
}
}
bool
net_ace::
connect (id_t target, unsigned int host, unsigned short port, bool is_secure)
{
if (_active == false)
return false;
// we're always connected to self
if (target == _id || isConnected (target))
{
printf ("net_ace::connect () connection for [%llu] already exists\n", target);
return true;
}
// convert target address to ACE format
ACE_INET_Addr target_addr (port, (ACE_UINT32)host);
// create new handler
net_ace_handler *handler;
ACE_NEW_RETURN (handler, net_ace_handler, false);
// initialize a connection, note that handler is treated as a SOCK_Stream object
// NOTE 2nd parameter in ACE_Time_Value is in microsecond (not milli)
int attempt_count = 0;
ACE_Time_Value sleeptime (0, 100000);
ACE_DEBUG ((LM_DEBUG, "connecting to %s:%u (%s)\n", target_addr.get_host_addr (), port, (is_secure ? "secure" : "non-secure")));
// three-second TCP connection timeout
ACE_Time_Value timeout (3, 0);
while (attempt_count <= RECONNECT_ATTEMPT)
{
int result;
#ifdef VAST_USE_SSL
if (is_secure)
{
result = _SSL_connector.connect (handler->getSSLStream (), target_addr, &timeout);
printf ("making secure connection, result: %d\n", result);
}
else
#endif
result = _connector.connect (*handler, target_addr, &timeout);
// if attempt succeed
if (result == 0)
break;
attempt_count++;
ACE_DEBUG ((LM_DEBUG, "connect %s:%d failed (try %d):\n", target_addr.get_host_addr (), target_addr.get_port_number (), attempt_count));
ACE_OS::sleep (sleeptime);
}
// see if we've failed
if (attempt_count > RECONNECT_ATTEMPT)
ACE_ERROR_RETURN ((LM_ERROR, "connect to %s:%u (%s) failed after %d re-attempts\n", target_addr.get_host_addr (), target_addr.get_port_number (), (is_secure ? "secure" : "normal"), attempt_count), false);
// open the handler object, this will
// 1) register handler with reactor 2) cause socket_connected () be called
if (handler->open (_reactor, this, target) == -1)
{
handler->close();
return false;
}
ACE_DEBUG ((LM_DEBUG, "(%5t) connect(): connected to (%s:%d)\n", target_addr.get_host_addr (), target_addr.get_port_number ()));
return true;
}