void get_item_observer::reply(msg const& m)
{
public_key pk;
signature sig;
sequence_number seq{0};
bdecode_node const r = m.message.dict_find_dict("r");
if (!r)
{
#ifndef TORRENT_DISABLE_LOGGING
get_observer()->log(dht_logger::traversal, "[%p] missing response dict"
, static_cast<void*>(algorithm()));
#endif
timeout();
return;
}
bdecode_node const k = r.dict_find_string("k");
if (k && k.string_length() == public_key::len)
std::memcpy(pk.bytes.data(), k.string_ptr(), public_key::len);
bdecode_node const s = r.dict_find_string("sig");
if (s && s.string_length() == signature::len)
std::memcpy(sig.bytes.data(), s.string_ptr(), signature::len);
bdecode_node const q = r.dict_find_int("seq");
if (q)
{
seq = sequence_number(q.int_value());
}
else if (k && s)
{
timeout();
return;
}
bdecode_node v = r.dict_find("v");
if (v)
{
static_cast<get_item*>(algorithm())->got_data(v, pk, seq, sig);
}
find_data_observer::reply(m);
}
// 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;
}
// 'top_level' is extracting the file for a single-file torrent. The
// distinction is that the filename is found in "name" rather than
// "path"
// root_dir is the name of the torrent, unless this is a single file
// torrent, in which case it's empty.
bool extract_single_file(bdecode_node const& dict, file_storage& files
, std::string const& root_dir, ptrdiff_t info_ptr_diff, bool top_level
, int& pad_file_cnt, error_code& ec)
{
if (dict.type() != bdecode_node::dict_t) return false;
boost::uint32_t file_flags = get_file_attributes(dict);
// symlinks have an implied "size" of zero. i.e. they use up 0 bytes of
// the torrent payload space
boost::int64_t const file_size = (file_flags & file_storage::flag_symlink)
? 0
: dict.dict_find_int_value("length", -1);
if (file_size < 0 )
{
ec = errors::torrent_invalid_length;
return false;
}
boost::int64_t const mtime = dict.dict_find_int_value("mtime", 0);
std::string path = root_dir;
std::string path_element;
char const* filename = NULL;
int filename_len = 0;
if (top_level)
{
// prefer the name.utf-8 because if it exists, it is more likely to be
// correctly encoded
bdecode_node p = dict.dict_find_string("name.utf-8");
if (!p) p = dict.dict_find_string("name");
if (!p || p.string_length() == 0)
{
ec = errors::torrent_missing_name;
return false;
}
filename = p.string_ptr() + info_ptr_diff;
filename_len = p.string_length();
while (filename_len > 0 && filename[0] == TORRENT_SEPARATOR)
{
filename += 1;
filename_len -= 1;
}
sanitize_append_path_element(path, p.string_ptr(), p.string_length());
}
else
{
bdecode_node p = dict.dict_find_list("path.utf-8");
if (!p) p = dict.dict_find_list("path");
if (p && p.list_size() > 0)
{
std::size_t const orig_path_len = path.size();
int const preallocate = path.size() + path_length(p, ec);
if (ec) return false;
path.reserve(preallocate);
for (int i = 0, end(p.list_size()); i < end; ++i)
{
bdecode_node e = p.list_at(i);
if (i == end - 1)
{
filename = e.string_ptr() + info_ptr_diff;
filename_len = e.string_length();
}
while (filename_len > 0 && filename[0] == TORRENT_SEPARATOR)
{
filename += 1;
filename_len -= 1;
}
sanitize_append_path_element(path, e.string_ptr(), e.string_length());
}
// if all path elements were sanitized away, we need to use another
// name instead
if (path.size() == orig_path_len)
{
path += TORRENT_SEPARATOR;
path += "_";
}
}
else if (file_flags & file_storage::flag_pad_file)
{
// pad files don't need a path element, we'll just store them
// under the .pad directory
char cnt[10];
snprintf(cnt, sizeof(cnt), "%d", pad_file_cnt);
path = combine_path(".pad", cnt);
++pad_file_cnt;
}
else
{
ec = errors::torrent_missing_name;
return false;
}
}
// bitcomet pad file
if (path.find("_____padding_file_") != std::string::npos)
file_flags = file_storage::flag_pad_file;
bdecode_node fh = dict.dict_find_string("sha1");
char const* filehash = NULL;
if (fh && fh.string_length() == 20)
filehash = fh.string_ptr() + info_ptr_diff;
std::string symlink_path;
if (file_flags & file_storage::flag_symlink)
{
if (bdecode_node s_p = dict.dict_find_list("symlink path"))
{
int const preallocate = path_length(s_p, ec);
if (ec) return false;
symlink_path.reserve(preallocate);
for (int i = 0, end(s_p.list_size()); i < end; ++i)
{
bdecode_node const& n = s_p.list_at(i);
sanitize_append_path_element(symlink_path, n.string_ptr()
, n.string_length());
}
}
}
else
{
file_flags &= ~file_storage::flag_symlink;
}
if (filename_len > path.length()
|| path.compare(path.size() - filename_len, filename_len, filename
, filename_len) != 0)
{
// if the filename was sanitized and differ, clear it to just use path
filename = NULL;
filename_len = 0;
}
files.add_file_borrow(filename, filename_len, path, file_size, file_flags, filehash
, mtime, symlink_path);
return true;
}