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adnl/adnl-proxy.cpp

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+/* 
+    This file is part of TON Blockchain source code.
+
+    TON Blockchain 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 2
+    of the License, or (at your option) any later version.
+
+    TON Blockchain 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 TON Blockchain.  If not, see <http://www.gnu.org/licenses/>.
+
+    In addition, as a special exception, the copyright holders give permission 
+    to link the code of portions of this program with the OpenSSL library. 
+    You must obey the GNU General Public License in all respects for all 
+    of the code used other than OpenSSL. If you modify file(s) with this 
+    exception, you may extend this exception to your version of the file(s), 
+    but you are not obligated to do so. If you do not wish to do so, delete this 
+    exception statement from your version. If you delete this exception statement 
+    from all source files in the program, then also delete it here.
+
+    Copyright 2017-2019 Telegram Systems LLP
+*/
+#include "td/actor/actor.h"
+#include "td/utils/buffer.h"
+#include "td/utils/port/IPAddress.h"
+#include "td/net/UdpServer.h"
+#include "td/utils/port/signals.h"
+#include "td/utils/OptionsParser.h"
+#include "td/utils/FileLog.h"
+#include "td/utils/port/path.h"
+#include "td/utils/port/user.h"
+#include "td/utils/filesystem.h"
+#include "common/checksum.h"
+#include "common/errorcode.h"
+#include "tl-utils/tl-utils.hpp"
+#include "auto/tl/ton_api_json.h"
+#include "adnl-proxy-types.h"
+#include <map>
+
+#if TD_DARWIN || TD_LINUX
+#include <unistd.h>
+#endif
+
+namespace ton {
+
+namespace adnl {
+
+class Receiver : public td::actor::Actor {
+ public:
+  void start_up() override;
+  void receive_common(td::BufferSlice data);
+  void receive_from_client(td::BufferSlice data);
+  void receive_to_client(td::BufferSlice data);
+
+  Receiver(td::uint16 in_port, td::uint16 out_port, std::shared_ptr<AdnlProxy> proxy, td::IPAddress client_addr)
+      : in_port_(in_port), out_port_(out_port), proxy_(std::move(proxy)), addr_(client_addr) {
+  }
+
+ private:
+  td::uint16 in_port_;
+  td::uint16 out_port_;
+  std::shared_ptr<ton::adnl::AdnlProxy> proxy_;
+  td::IPAddress addr_;
+  td::actor::ActorOwn<td::UdpServer> out_udp_server_;
+  td::actor::ActorOwn<td::UdpServer> in_udp_server_;
+};
+
+void Receiver::start_up() {
+  class Callback : public td::UdpServer::Callback {
+   public:
+    Callback(td::actor::ActorId<Receiver> manager, td::uint32 mode) : manager_(std::move(manager)), mode_(mode) {
+    }
+
+   private:
+    td::actor::ActorId<Receiver> manager_;
+    const td::uint32 mode_;
+    void on_udp_message(td::UdpMessage udp_message) override {
+      if (udp_message.error.is_error()) {
+        LOG(DEBUG) << udp_message.error;
+        return;
+      }
+      if (mode_ == 0) {
+        td::actor::send_closure_later(manager_, &Receiver::receive_common, std::move(udp_message.data));
+      } else if (mode_ == 1) {
+        td::actor::send_closure_later(manager_, &Receiver::receive_from_client, std::move(udp_message.data));
+      } else {
+        td::actor::send_closure_later(manager_, &Receiver::receive_to_client, std::move(udp_message.data));
+      }
+    }
+  };
+
+  if (in_port_ == out_port_) {
+    auto X = td::UdpServer::create("udp server", in_port_, std::make_unique<Callback>(actor_id(this), 0));
+    X.ensure();
+    in_udp_server_ = X.move_as_ok();
+  } else {
+    auto X = td::UdpServer::create("udp server", in_port_, std::make_unique<Callback>(actor_id(this), 1));
+    X.ensure();
+    in_udp_server_ = X.move_as_ok();
+    X = td::UdpServer::create("udp server", out_port_, std::make_unique<Callback>(actor_id(this), 2));
+    X.ensure();
+    out_udp_server_ = X.move_as_ok();
+  }
+}
+
+void Receiver::receive_common(td::BufferSlice data) {
+  if (data.size() <= 32) {
+    return;
+  }
+
+  td::Bits256 id;
+  id.as_slice().copy_from(data.as_slice().truncate(32));
+
+  if (id.is_zero()) {
+    receive_from_client(std::move(data));
+  } else {
+    receive_to_client(std::move(data));
+  }
+}
+
+void Receiver::receive_from_client(td::BufferSlice data) {
+  auto F = proxy_->decrypt(std::move(data));
+  if (F.is_error()) {
+    return;
+  }
+  auto f = F.move_as_ok();
+
+  td::IPAddress a;
+  if (a.init_ipv4_port(td::IPAddress::ipv4_to_str(f.ip), f.port).is_error()) {
+    return;
+  }
+
+  td::UdpMessage M;
+  M.address = a;
+  M.data = std::move(f.data);
+
+  td::actor::send_closure(out_udp_server_.empty() ? in_udp_server_.get() : out_udp_server_.get(), &td::UdpServer::send,
+                          std::move(M));
+}
+
+void Receiver::receive_to_client(td::BufferSlice data) {
+  LOG(DEBUG) << "proxying to " << addr_;
+  td::UdpMessage M;
+  M.address = addr_;
+  M.data = std::move(data);
+
+  td::actor::send_closure(in_udp_server_.empty() ? out_udp_server_.get() : in_udp_server_.get(), &td::UdpServer::send,
+                          std::move(M));
+}
+
+}  // namespace adnl
+
+}  // namespace ton
+
+int main(int argc, char *argv[]) {
+  SET_VERBOSITY_LEVEL(verbosity_INFO);
+
+  td::set_default_failure_signal_handler().ensure();
+
+  std::vector<td::actor::ActorOwn<ton::adnl::Receiver>> x;
+  std::unique_ptr<td::LogInterface> logger_;
+  SCOPE_EXIT {
+    td::log_interface = td::default_log_interface;
+  };
+
+  std::string config = "/var/ton-work/etc/adnl-proxy.conf.json";
+
+  td::OptionsParser p;
+  p.set_description("validator or full node for TON network");
+  p.add_option('v', "verbosity", "set verbosity level", [&](td::Slice arg) {
+    int v = VERBOSITY_NAME(FATAL) + (td::to_integer<int>(arg));
+    SET_VERBOSITY_LEVEL(v);
+    return td::Status::OK();
+  });
+  p.add_option('h', "help", "prints_help", [&]() {
+    char b[10240];
+    td::StringBuilder sb(td::MutableSlice{b, 10000});
+    sb << p;
+    std::cout << sb.as_cslice().c_str();
+    std::exit(2);
+    return td::Status::OK();
+  });
+  p.add_option('c', "config", "config file", [&](td::Slice arg) {
+    config = arg.str();
+    return td::Status::OK();
+  });
+  p.add_option('d', "daemonize", "set SIGHUP", [&]() {
+    td::set_signal_handler(td::SignalType::HangUp, [](int sig) {
+#if TD_DARWIN || TD_LINUX
+      close(0);
+      setsid();
+#endif
+    }).ensure();
+    return td::Status::OK();
+  });
+#if TD_DARWIN || TD_LINUX
+  p.add_option('l', "logname", "log to file", [&](td::Slice fname) {
+    auto F = std::make_unique<td::FileLog>();
+    TRY_STATUS(F->init(fname.str()));
+    logger_ = std::move(F);
+    td::log_interface = logger_.get();
+    return td::Status::OK();
+  });
+#endif
+  td::uint32 threads = 7;
+  p.add_option('t', "threads", PSTRING() << "number of threads (default=" << threads << ")", [&](td::Slice fname) {
+    td::int32 v;
+    try {
+      v = std::stoi(fname.str());
+    } catch (...) {
+      return td::Status::Error(ton::ErrorCode::error, "bad value for --threads: not a number");
+    }
+    if (v < 1 || v > 256) {
+      return td::Status::Error(ton::ErrorCode::error, "bad value for --threads: should be in range [1..256]");
+    }
+    threads = v;
+    return td::Status::OK();
+  });
+  p.add_option('u', "user", "change user", [&](td::Slice user) { return td::change_user(user); });
+
+  p.run(argc, argv).ensure();
+
+  td::actor::Scheduler scheduler({threads});
+
+  auto R = [&]() -> td::Status {
+    TRY_RESULT_PREFIX(conf_data, td::read_file(config), "failed to read: ");
+    TRY_RESULT_PREFIX(conf_json, td::json_decode(conf_data.as_slice()), "failed to parse json: ");
+
+    ton::ton_api::engine_adnlProxy_config conf;
+    TRY_STATUS_PREFIX(ton::ton_api::from_json(conf, conf_json.get_object()), "json does not fit TL scheme: ");
+
+    if (!conf.ports_.size()) {
+      return td::Status::Error("empty config");
+    }
+
+    for (auto &y : conf.ports_) {
+      auto in_port = static_cast<td::uint16>(y->in_port_);
+      auto out_port = static_cast<td::uint16>(y->out_port_);
+      if (!y->proxy_type_) {
+        return td::Status::Error("empty proxy type");
+      }
+      TRY_RESULT(proxy, ton::adnl::AdnlProxy::create(*y->proxy_type_.get()));
+      td::IPAddress a;
+      a.init_ipv4_port(td::IPAddress::ipv4_to_str(y->dst_ip_), static_cast<td::uint16>(y->dst_port_)).ensure();
+
+      scheduler.run_in_context([&] {
+        x.push_back(td::actor::create_actor<ton::adnl::Receiver>("adnl-proxy", in_port, out_port, std::move(proxy), a));
+      });
+    }
+
+    return td::Status::OK();
+  }();
+
+  if (R.is_error()) {
+    LOG(FATAL) << "bad config: " << R.move_as_error();
+  }
+
+  while (scheduler.run(1)) {
+  }
+}