// TODO: 2 returning a bool here is redundant. Instead this function should
// return the peer_entry
bool extract_peer_info(bdecode_node const& info, peer_entry& ret, error_code& ec)
{
// extract peer id (if any)
if (info.type() != bdecode_node::dict_t)
{
ec.assign(errors::invalid_peer_dict, get_libtorrent_category());
return false;
}
bdecode_node i = info.dict_find_string("peer id");
if (i && i.string_length() == 20)
{
std::copy(i.string_ptr(), i.string_ptr()+20, ret.pid.begin());
}
else
{
// if there's no peer_id, just initialize it to a bunch of zeroes
std::fill_n(ret.pid.begin(), 20, 0);
}
// extract ip
i = info.dict_find_string("ip");
if (i == 0)
{
ec.assign(errors::invalid_tracker_response, get_libtorrent_category());
return false;
}
ret.hostname = i.string_value();
// extract port
i = info.dict_find_int("port");
if (i == 0)
{
ec.assign(errors::invalid_tracker_response, get_libtorrent_category());
return false;
}
ret.port = boost::uint16_t(i.int_value());
return true;
}
int load_file(std::string const& filename, std::vector<char>& v, error_code& ec, int limit)
{
ec.clear();
file f;
if (!f.open(filename, file::read_only, ec)) return -1;
std::int64_t s = f.get_size(ec);
if (ec) return -1;
if (s > limit)
{
ec = error_code(errors::metadata_too_large, get_libtorrent_category());
return -2;
}
v.resize(s);
if (s == 0) return 0;
file::iovec_t b = {&v[0], size_t(s) };
std::int64_t read = f.readv(0, &b, 1, ec);
if (read != s) return -3;
if (ec) return -3;
return 0;
}
QString StaticHelpers::translateLibTorrentError(error_code const& ec)
{
#if LIBTORRENT_VERSION_NUM >= 10000
if (ec.category() == get_libtorrent_category())
{
return translateSessionError(ec);
}
if (ec.category() == get_bdecode_category())
{
return translateBEncodeError(ec);
}
if (ec.category() == get_gzip_category())
{
return translateGzipError(ec);
}
if (ec.category() == get_i2p_category())
{
return translateI2PError(ec);
}
if (ec.category() == get_socks_category())
{
return translateSocksError(ec);
}
if (ec.category() == get_upnp_category())
{
return translateUpnpError(ec);
}
#endif
return QString::fromLocal8Bit(ec.message().c_str());
}
tracker_response parse_tracker_response(char const* data, int size, error_code& ec
, int flags, sha1_hash scrape_ih)
{
tracker_response resp;
bdecode_node e;
int res = bdecode(data, data + size, e, ec);
if (ec) return resp;
if (res != 0 || e.type() != bdecode_node::dict_t)
{
ec.assign(errors::invalid_tracker_response, get_libtorrent_category());
return resp;
}
int interval = int(e.dict_find_int_value("interval", 0));
// if no interval is specified, default to 30 minutes
if (interval == 0) interval = 1800;
int min_interval = int(e.dict_find_int_value("min interval", 30));
resp.interval = interval;
resp.min_interval = min_interval;
bdecode_node tracker_id = e.dict_find_string("tracker id");
if (tracker_id)
resp.trackerid = tracker_id.string_value();
// parse the response
bdecode_node failure = e.dict_find_string("failure reason");
if (failure)
{
resp.failure_reason = failure.string_value();
ec.assign(errors::tracker_failure, get_libtorrent_category());
return resp;
}
bdecode_node warning = e.dict_find_string("warning message");
if (warning)
resp.warning_message = warning.string_value();
if (0 != (flags & tracker_request::scrape_request))
{
bdecode_node files = e.dict_find_dict("files");
if (!files)
{
ec.assign(errors::invalid_files_entry, get_libtorrent_category());
return resp;
}
bdecode_node scrape_data = files.dict_find_dict(
scrape_ih.to_string());
if (!scrape_data)
{
ec.assign(errors::invalid_hash_entry, get_libtorrent_category());
return resp;
}
resp.complete = int(scrape_data.dict_find_int_value("complete", -1));
resp.incomplete = int(scrape_data.dict_find_int_value("incomplete", -1));
resp.downloaded = int(scrape_data.dict_find_int_value("downloaded", -1));
resp.downloaders = int(scrape_data.dict_find_int_value("downloaders", -1));
return resp;
}
// look for optional scrape info
resp.complete = int(e.dict_find_int_value("complete", -1));
resp.incomplete = int(e.dict_find_int_value("incomplete", -1));
resp.downloaded = int(e.dict_find_int_value("downloaded", -1));
bdecode_node peers_ent = e.dict_find("peers");
if (peers_ent && peers_ent.type() == bdecode_node::string_t)
{
char const* peers = peers_ent.string_ptr();
int len = peers_ent.string_length();
#if TORRENT_USE_I2P
if (0 != (flags & tracker_request::i2p))
{
error_code parse_error;
for (int i = 0; i < len; i += 32)
{
if (len - i < 32) break;
peer_entry p;
p.hostname = base32encode(std::string(peers + i, 32), string::i2p);
p.hostname += ".b32.i2p";
p.port = 6881;
resp.peers.push_back(p);
}
}
else
#endif
{
resp.peers4.reserve(len / 6);
for (int i = 0; i < len; i += 6)
{
if (len - i < 6) break;
ipv4_peer_entry p;
p.ip = detail::read_v4_address(peers).to_v4().to_bytes();
p.port = detail::read_uint16(peers);
resp.peers4.push_back(p);
}
}
}
else if (peers_ent && peers_ent.type() == bdecode_node::list_t)
{
int len = peers_ent.list_size();
resp.peers.reserve(len);
error_code parse_error;
for (int i = 0; i < len; ++i)
{
peer_entry p;
if (!extract_peer_info(peers_ent.list_at(i), p, parse_error))
continue;
resp.peers.push_back(p);
}
// only report an error if all peer entries are invalid
if (resp.peers.empty() && parse_error)
{
ec = parse_error;
return resp;
}
}
else
{
peers_ent.clear();
}
#if TORRENT_USE_IPV6
bdecode_node ipv6_peers = e.dict_find_string("peers6");
if (ipv6_peers)
{
char const* peers = ipv6_peers.string_ptr();
int len = ipv6_peers.string_length();
resp.peers6.reserve(len / 18);
for (int i = 0; i < len; i += 18)
{
if (len - i < 18) break;
ipv6_peer_entry p;
p.ip = detail::read_v6_address(peers).to_v6().to_bytes();
p.port = detail::read_uint16(peers);
resp.peers6.push_back(p);
}
}
else
{
ipv6_peers.clear();
}
#else
bdecode_node ipv6_peers;
#endif
/*
// if we didn't receive any peers. We don't care if we're stopping anyway
if (peers_ent == 0 && ipv6_peers == 0
&& tracker_req().event != tracker_request::stopped)
{
ec.assign(errors::invalid_peers_entry, get_libtorrent_category());
return resp;
}
*/
bdecode_node ip_ent = e.dict_find_string("external ip");
if (ip_ent)
{
char const* p = ip_ent.string_ptr();
if (ip_ent.string_length() == int(address_v4::bytes_type().size()))
resp.external_ip = detail::read_v4_address(p);
#if TORRENT_USE_IPV6
else if (ip_ent.string_length() == int(address_v6::bytes_type().size()))
resp.external_ip = detail::read_v6_address(p);
#endif
}
return resp;
}
tracker_response parse_tracker_response(char const* data, int size, error_code& ec
, bool scrape_request, sha1_hash scrape_ih)
{
tracker_response resp;
lazy_entry e;
int res = lazy_bdecode(data, data + size, e, ec);
if (ec) return resp;
if (res != 0 || e.type() != lazy_entry::dict_t)
{
ec.assign(errors::invalid_tracker_response, get_libtorrent_category());
return resp;
}
int interval = int(e.dict_find_int_value("interval", 0));
// if no interval is specified, default to 30 minutes
if (interval == 0) interval = 1800;
int min_interval = int(e.dict_find_int_value("min interval", 30));
resp.interval = interval;
resp.min_interval = min_interval;
lazy_entry const* tracker_id = e.dict_find_string("tracker id");
if (tracker_id)
resp.trackerid = tracker_id->string_value();
// parse the response
lazy_entry const* failure = e.dict_find_string("failure reason");
if (failure)
{
resp.failure_reason = failure->string_value();
ec.assign(errors::tracker_failure, get_libtorrent_category());
return resp;
}
lazy_entry const* warning = e.dict_find_string("warning message");
if (warning)
resp.warning_message = warning->string_value();
if (scrape_request)
{
lazy_entry const* files = e.dict_find_dict("files");
if (files == 0)
{
ec.assign(errors::invalid_files_entry, get_libtorrent_category());
return resp;
}
lazy_entry const* scrape_data = files->dict_find_dict(
scrape_ih.to_string());
if (scrape_data == 0)
{
ec.assign(errors::invalid_hash_entry, get_libtorrent_category());
return resp;
}
resp.complete = int(scrape_data->dict_find_int_value("complete", -1));
resp.incomplete = int(scrape_data->dict_find_int_value("incomplete", -1));
resp.downloaded = int(scrape_data->dict_find_int_value("downloaded", -1));
resp.downloaders = int(scrape_data->dict_find_int_value("downloaders", -1));
return resp;
}
// look for optional scrape info
resp.complete = int(e.dict_find_int_value("complete", -1));
resp.incomplete = int(e.dict_find_int_value("incomplete", -1));
resp.downloaded = int(e.dict_find_int_value("downloaded", -1));
lazy_entry const* peers_ent = e.dict_find("peers");
if (peers_ent && peers_ent->type() == lazy_entry::string_t)
{
char const* peers = peers_ent->string_ptr();
int len = peers_ent->string_length();
resp.peers4.reserve(len / 6);
for (int i = 0; i < len; i += 6)
{
if (len - i < 6) break;
ipv4_peer_entry p;
error_code ec;
p.ip = detail::read_v4_address(peers).to_v4().to_bytes();
p.port = detail::read_uint16(peers);
resp.peers4.push_back(p);
}
}
else if (peers_ent && peers_ent->type() == lazy_entry::list_t)
{
int len = peers_ent->list_size();
resp.peers.reserve(len);
error_code parse_error;
for (int i = 0; i < len; ++i)
{
peer_entry p;
if (!extract_peer_info(*peers_ent->list_at(i), p, parse_error))
continue;
resp.peers.push_back(p);
}
// only report an error if all peer entries are invalid
if (resp.peers.empty() && parse_error)
{
ec = parse_error;
return resp;
}
}
else
{
peers_ent = 0;
}
#if TORRENT_USE_IPV6
lazy_entry const* ipv6_peers = e.dict_find_string("peers6");
if (ipv6_peers)
{
char const* peers = ipv6_peers->string_ptr();
int len = ipv6_peers->string_length();
resp.peers6.reserve(len / 18);
for (int i = 0; i < len; i += 18)
{
if (len - i < 18) break;
ipv6_peer_entry p;
p.ip = detail::read_v6_address(peers).to_v6().to_bytes();
p.port = detail::read_uint16(peers);
resp.peers6.push_back(p);
}
}
else
{
ipv6_peers = 0;
}
#else
lazy_entry const* ipv6_peers = 0;
#endif
/*
// if we didn't receive any peers. We don't care if we're stopping anyway
if (peers_ent == 0 && ipv6_peers == 0
&& tracker_req().event != tracker_request::stopped)
{
ec.assign(errors::invalid_peers_entry, get_libtorrent_category());
return resp;
}
*/
lazy_entry const* ip_ent = e.dict_find_string("external ip");
if (ip_ent)
{
char const* p = ip_ent->string_ptr();
if (ip_ent->string_length() == int(address_v4::bytes_type().size()))
resp.external_ip = detail::read_v4_address(p);
#if TORRENT_USE_IPV6
else if (ip_ent->string_length() == int(address_v6::bytes_type().size()))
resp.external_ip = detail::read_v6_address(p);
#endif
}
return resp;
}
