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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab ft=cpp
#include "rgw_torrent.h"
#include <ctime>
#include <fmt/format.h>
#include "common/split.h"
#include "rgw_sal.h"
#define ANNOUNCE "announce"
#define ANNOUNCE_LIST "announce-list"
#define COMMENT "comment"
#define CREATED_BY "created by"
#define CREATION_DATE "creation date"
#define ENCODING "encoding"
#define LENGTH "length"
#define NAME "name"
#define PIECE_LENGTH "piece length"
#define PIECES "pieces"
#define INFO_PIECES "info"
//control characters
void bencode_dict(bufferlist& bl) { bl.append('d'); }
void bencode_list(bufferlist& bl) { bl.append('l'); }
void bencode_end(bufferlist& bl) { bl.append('e'); }
//key len
void bencode_key(std::string_view key, bufferlist& bl)
{
bl.append(fmt::format("{}:", key.size()));
bl.append(key);
}
//single values
void bencode(int value, bufferlist& bl)
{
bl.append(fmt::format("i{}", value));
bencode_end(bl);
}
//single values
void bencode(std::string_view str, bufferlist& bl)
{
bencode_key(str, bl);
}
//dictionary elements
void bencode(std::string_view key, int value, bufferlist& bl)
{
bencode_key(key, bl);
bencode(value, bl);
}
//dictionary elements
void bencode(std::string_view key, std::string_view value, bufferlist& bl)
{
bencode_key(key, bl);
bencode(value, bl);
}
int rgw_read_torrent_file(const DoutPrefixProvider* dpp,
rgw::sal::Object* object,
ceph::bufferlist &bl,
optional_yield y)
{
bufferlist infobl;
int r = object->get_torrent_info(dpp, y, infobl);
if (r < 0) {
ldpp_dout(dpp, 0) << "ERROR: read_torrent_info failed: " << r << dendl;
return r;
}
// add other fields from config
auto& conf = dpp->get_cct()->_conf;
bencode_dict(bl);
auto trackers = ceph::split(conf->rgw_torrent_tracker, ",");
if (auto i = trackers.begin(); i != trackers.end()) {
bencode_key(ANNOUNCE, bl);
bencode_key(*i, bl);
bencode_key(ANNOUNCE_LIST, bl);
bencode_list(bl);
for (; i != trackers.end(); ++i) {
bencode_list(bl);
bencode_key(*i, bl);
bencode_end(bl);
}
bencode_end(bl);
}
std::string_view comment = conf->rgw_torrent_comment;
if (!comment.empty()) {
bencode(COMMENT, comment, bl);
}
std::string_view create_by = conf->rgw_torrent_createby;
if (!create_by.empty()) {
bencode(CREATED_BY, create_by, bl);
}
std::string_view encoding = conf->rgw_torrent_encoding;
if (!encoding.empty()) {
bencode(ENCODING, encoding, bl);
}
// append the info stored in the object
bl.append(std::move(infobl));
return 0;
}
RGWPutObj_Torrent::RGWPutObj_Torrent(rgw::sal::DataProcessor* next,
size_t max_len, size_t piece_len)
: Pipe(next), max_len(max_len), piece_len(piece_len)
{
}
int RGWPutObj_Torrent::process(bufferlist&& data, uint64_t logical_offset)
{
if (!data.length()) { // done
if (piece_offset) { // hash the remainder
char out[ceph::crypto::SHA1::digest_size];
digest.Final(reinterpret_cast<unsigned char*>(out));
piece_hashes.append(out, sizeof(out));
piece_count++;
}
return Pipe::process(std::move(data), logical_offset);
}
len += data.length();
if (len >= max_len) {
// enforce the maximum object size; stop calculating and buffering hashes
piece_hashes.clear();
piece_offset = 0;
piece_count = 0;
return Pipe::process(std::move(data), logical_offset);
}
auto p = data.begin();
while (!p.end()) {
// feed each buffer segment through sha1
uint32_t want = piece_len - piece_offset;
const char* buf = nullptr;
size_t bytes = p.get_ptr_and_advance(want, &buf);
digest.Update(reinterpret_cast<const unsigned char*>(buf), bytes);
piece_offset += bytes;
// record the hash digest at each piece boundary
if (bytes == want) {
char out[ceph::crypto::SHA1::digest_size];
digest.Final(reinterpret_cast<unsigned char*>(out));
digest.Restart();
piece_hashes.append(out, sizeof(out));
piece_count++;
piece_offset = 0;
}
}
return Pipe::process(std::move(data), logical_offset);
}
bufferlist RGWPutObj_Torrent::bencode_torrent(std::string_view filename) const
{
bufferlist bl;
if (len >= max_len) {
return bl;
}
// Only encode create_date and sha1 info. Other fields will be added during
// GetObjectTorrent by rgw_read_torrent_file()
// issue tracked here: https://tracker.ceph.com/issues/61160
// coverity[store_truncates_time_t:SUPPRESS]
bencode(CREATION_DATE, std::time(nullptr), bl);
bencode_key(INFO_PIECES, bl);
bencode_dict(bl);
bencode(LENGTH, len, bl);
bencode(NAME, filename, bl);
bencode(PIECE_LENGTH, piece_len, bl);
bencode_key(PIECES, bl);
bl.append(std::to_string(piece_count));
bl.append(':');
bl.append(piece_hashes);
bencode_end(bl);
return bl;
}
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