premiere-libtorrent/examples/make_torrent.cpp

348 lines
9.6 KiB
C++

/*
Copyright (c) 2006-2017, Arvid Norberg
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the distribution.
* Neither the name of the author nor the names of its
contributors may be used to endorse or promote products derived
from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
*/
#include "libtorrent/entry.hpp"
#include "libtorrent/bencode.hpp"
#include "libtorrent/torrent_info.hpp"
#include "libtorrent/storage.hpp"
#include "libtorrent/hasher.hpp"
#include "libtorrent/create_torrent.hpp"
#include <functional>
#include <cstdio>
#include <sstream>
#include <fstream>
#include <iostream>
#ifdef TORRENT_WINDOWS
#include <direct.h> // for _getcwd
#endif
using namespace std::placeholders;
std::vector<char> load_file(std::string const& filename)
{
std::fstream in;
in.exceptions(std::ifstream::failbit);
in.open(filename.c_str(), std::ios_base::in | std::ios_base::binary);
in.seekg(0, std::ios_base::end);
size_t const size = size_t(in.tellg());
in.seekg(0, std::ios_base::beg);
std::vector<char> ret(size);
in.read(ret.data(), ret.size());
return ret;
}
std::string branch_path(std::string const& f)
{
if (f.empty()) return f;
#ifdef TORRENT_WINDOWS
if (f == "\\\\") return "";
#endif
if (f == "/") return "";
int len = int(f.size());
// if the last character is / or \ ignore it
if (f[len-1] == '/' || f[len-1] == '\\') --len;
while (len > 0) {
--len;
if (f[len] == '/' || f[len] == '\\')
break;
}
if (f[len] == '/' || f[len] == '\\') ++len;
return std::string(f.c_str(), len);
}
// do not include files and folders whose
// name starts with a .
bool file_filter(std::string const& f)
{
if (f.empty()) return false;
char const* first = f.c_str();
char const* sep = strrchr(first, '/');
#if defined(TORRENT_WINDOWS) || defined(TORRENT_OS2)
char const* altsep = strrchr(first, '\\');
if (sep == nullptr || altsep > sep) sep = altsep;
#endif
// if there is no parent path, just set 'sep'
// to point to the filename.
// if there is a parent path, skip the '/' character
if (sep == nullptr) sep = first;
else ++sep;
// return false if the first character of the filename is a .
if (sep[0] == '.') return false;
std::cerr << f << "\n";
return true;
}
void print_usage()
{
std::cerr << R"(usage: make_torrent FILE [OPTIONS]
Generates a torrent file from the specified file
or directory and writes it to standard out
OPTIONS:
-m file generate a merkle hash tree torrent.
merkle torrents require client support
the resulting full merkle tree is written to
the specified file
-w url adds a web seed to the torrent with
the specified url
-t url adds the specified tracker to the
torrent. For multiple trackers, specify more
-t options
-c comment sets the comment to the specified string
-C creator sets the created-by field to the specified string
-p bytes enables padding files. Files larger
than bytes will be piece-aligned
-s bytes specifies a piece size for the torrent
This has to be a multiple of 16 kiB
-l Don't follow symlinks, instead encode them as
links in the torrent file
-o file specifies the output filename of the torrent file
If this is not specified, the torrent file is
printed to the standard out, except on windows
where the filename defaults to a.torrent
-r file add root certificate to the torrent, to verify
the HTTPS tracker
-S info-hash add a similar torrent by info-hash. The similar
torrent is expected to share some files with this one
-L collection add a collection name to this torrent. Other torrents
in the same collection is expected to share files
with this one.
-M make the torrent compatible with mutable torrents
this means aligning large files and pad them in order
for piece hashes to uniquely indentify a file without
overlap
)";
}
int main(int argc_, char const* argv_[]) try
{
lt::span<char const*> args(argv_, size_t(argc_));
std::string creator_str = "libtorrent";
std::string comment_str;
if (args.size() < 2) {
print_usage();
return 1;
}
std::vector<std::string> web_seeds;
std::vector<std::string> trackers;
std::vector<std::string> collections;
std::vector<lt::sha1_hash> similar;
int pad_file_limit = -1;
int piece_size = 0;
lt::create_flags_t flags = {};
std::string root_cert;
std::string outfile;
std::string merklefile;
#ifdef TORRENT_WINDOWS
// don't ever write binary data to the console on windows
// it will just be interpreted as text and corrupted
outfile = "a.torrent";
#endif
std::string full_path = args[1];
args = args.subspan(2);
for (; !args.empty(); args = args.subspan(1)) {
if (args[0][0] != '-') {
print_usage();
return 1;
}
char const flag = args[0][1];
switch (flag)
{
case 'M':
flags |= lt::create_torrent::mutable_torrent_support;
pad_file_limit = 0x4000;
continue;
case 'l':
flags |= lt::create_torrent::symlinks;
continue;
}
if (args.size() < 2) {
print_usage();
return 1;
}
switch (flag)
{
case 'w': web_seeds.push_back(args[1]); break;
case 't': trackers.push_back(args[1]); break;
case 's': piece_size = atoi(args[1]); break;
case 'o': outfile = args[1]; break;
case 'C': creator_str = args[1]; break;
case 'c': comment_str = args[1]; break;
case 'r': root_cert = args[1]; break;
case 'L': collections.push_back(args[1]); break;
case 'p':
pad_file_limit = atoi(args[1]);
flags |= lt::create_torrent::optimize_alignment;
break;
case 'm':
merklefile = args[1];
flags |= lt::create_torrent::merkle;
break;
case 'S': {
if (strlen(args[1]) != 40) {
std::cerr << "invalid info-hash for -S. "
"Expected 40 hex characters\n";
print_usage();
return 1;
}
std::stringstream hash(args[1]);
lt::sha1_hash ih;
hash >> ih;
if (hash.fail()) {
std::cerr << "invalid info-hash for -S\n";
print_usage();
return 1;
}
similar.push_back(ih);
break;
}
default:
print_usage();
return 1;
}
args = args.subspan(1);
}
lt::file_storage fs;
#ifdef TORRENT_WINDOWS
if (full_path[1] != ':')
#else
if (full_path[0] != '/')
#endif
{
char cwd[2048];
#ifdef TORRENT_WINDOWS
#define getcwd_ _getcwd
#else
#define getcwd_ getcwd
#endif
char const* ret = getcwd_(cwd, sizeof(cwd));
if (ret == nullptr) {
std::cerr << "failed to get current working directory: "
<< strerror(errno) << "\n";
return 1;
}
#undef getcwd_
#ifdef TORRENT_WINDOWS
full_path = cwd + ("\\" + full_path);
#else
full_path = cwd + ("/" + full_path);
#endif
}
lt::add_files(fs, full_path, file_filter, flags);
if (fs.num_files() == 0) {
std::cerr << "no files specified.\n";
return 1;
}
lt::create_torrent t(fs, piece_size, pad_file_limit, flags);
int tier = 0;
for (std::string const& tr : trackers) {
t.add_tracker(tr, tier);
++tier;
}
for (std::string const& ws : web_seeds)
t.add_url_seed(ws);
for (std::string const& c : collections)
t.add_collection(c);
for (lt::sha1_hash const& s : similar)
t.add_similar_torrent(s);
auto const num = t.num_pieces();
lt::set_piece_hashes(t, branch_path(full_path)
, [num] (lt::piece_index_t const p) {
std::cerr << "\r" << p << "/" << num;
});
std::cerr << "\n";
t.set_creator(creator_str.c_str());
if (!comment_str.empty()) {
t.set_comment(comment_str.c_str());
}
if (!root_cert.empty()) {
std::vector<char> const pem = load_file(root_cert);
t.set_root_cert(std::string(&pem[0], pem.size()));
}
// create the torrent and print it to stdout
std::vector<char> torrent;
lt::bencode(back_inserter(torrent), t.generate());
if (!outfile.empty()) {
std::fstream out;
out.exceptions(std::ifstream::failbit);
out.open(outfile.c_str(), std::ios_base::out | std::ios_base::binary);
out.write(torrent.data(), torrent.size());
}
else {
std::cout.write(torrent.data(), torrent.size());
}
if (!merklefile.empty()) {
std::fstream merkle;
merkle.exceptions(std::ifstream::failbit);
merkle.open(merklefile.c_str(), std::ios_base::out | std::ios_base::binary);
auto const& tree = t.merkle_tree();
merkle.write(reinterpret_cast<char const*>(tree.data()), tree.size() * 20);
}
return 0;
}
catch (std::exception& e) {
std::cerr << "ERROR: " << e.what() << "\n";
return 1;
}