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/*
* Copyright (C) 2014-2023 Savoir-faire Linux Inc.
*
* Author: Adrien Béraud <adrien.beraud@savoirfairelinux.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "tools_common.h"
#include <opendht/node.h>
extern "C" {
#include <gnutls/gnutls.h>
}
#include <set>
#include <condition_variable>
#include <mutex>
using namespace dht;
void print_usage() {
std::cout << "Usage: dhtscanner [-n network_id] [-p local_port] [-b bootstrap_host[:port]]" << std::endl << std::endl;
std::cout << "dhtscanner, a simple OpenDHT command line utility generating scan result the network." << std::endl;
std::cout << "Report bugs to: https://opendht.net" << std::endl;
}
struct snode_compare {
bool operator() (const std::shared_ptr<Node>& lhs, const std::shared_ptr<Node>& rhs) const{
return (lhs->id < rhs->id) ||
(lhs->id == rhs->id && lhs->getFamily() == AF_INET && rhs->getFamily() == AF_INET6);
}
};
using NodeSet = std::set<std::shared_ptr<Node>, snode_compare>;
std::condition_variable cv;
void
step(DhtRunner& dht, std::atomic_uint& done, std::shared_ptr<NodeSet> all_nodes, dht::InfoHash cur_h, unsigned cur_depth)
{
std::cout << "step at " << cur_h << ", depth " << cur_depth << std::endl;
done++;
dht.get(cur_h, [all_nodes](const std::vector<std::shared_ptr<Value>>& /*values*/) {
return true;
}, [&,all_nodes,cur_h,cur_depth](bool, const std::vector<std::shared_ptr<Node>>& nodes) {
all_nodes->insert(nodes.begin(), nodes.end());
NodeSet sbuck {nodes.begin(), nodes.end()};
if (not sbuck.empty()) {
unsigned bdepth = sbuck.size()==1 ? 0u : InfoHash::commonBits((*sbuck.begin())->id, (*sbuck.rbegin())->id);
unsigned target_depth = std::min(8u, bdepth+6u);
std::cout << cur_h << " : " << nodes.size() << " nodes; target is " << target_depth << " bits deep (cur " << cur_depth << ")" << std::endl;
for (unsigned b = cur_depth ; b < target_depth; b++) {
auto new_h = cur_h;
new_h.setBit(b, 1);
step(dht, done, all_nodes, new_h, b+1);
}
}
done--;
std::cout << done.load() << " operations left, " << all_nodes->size() << " nodes found." << std::endl;
cv.notify_one();
});
}
int
main(int argc, char **argv)
{
#ifdef _MSC_VER
gnutls_global_init();
#endif
auto params = parseArgs(argc, argv);
if (params.help) {
print_usage();
return 0;
}
DhtRunner dht;
try {
auto dhtConf = getDhtConfig(params);
dht.run(params.port, dhtConf.first, std::move(dhtConf.second));
if (not params.bootstrap.empty())
dht.bootstrap(params.bootstrap);
print_node_info(dht.getNodeInfo());
std::cout << "Scanning network..." << std::endl;
auto all_nodes = std::make_shared<NodeSet>();
// Set hash to 1 because 0 is the null hash
dht::InfoHash cur_h {};
cur_h.setBit(8*HASH_LEN-1, 1);
std::this_thread::sleep_for(std::chrono::seconds(2));
std::atomic_uint done {0};
step(dht, done, all_nodes, cur_h, 0);
{
std::mutex m;
std::unique_lock<std::mutex> lk(m);
cv.wait(lk, [&](){
return done.load() == 0;
});
}
std::cout << std::endl << "Scan ended: " << all_nodes->size() << " nodes found." << std::endl;
for (const auto& n : *all_nodes)
std::cout << "Node " << *n << std::endl;
} catch(const std::exception&e) {
std::cerr << std::endl << e.what() << std::endl;
}
dht.join();
#ifdef _MSC_VER
gnutls_global_deinit();
#endif
return 0;
}
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