src/anyrtpproxy/anyrtpproxy.cpp

   1 /*
   2  *  anytun
   3  *
   4  *  The secure anycast tunneling protocol (satp) defines a protocol used
   5  *  for communication between any combination of unicast and anycast
   6  *  tunnel endpoints.  It has less protocol overhead than IPSec in Tunnel
   7  *  mode and allows tunneling of every ETHER TYPE protocol (e.g.
   8  *  ethernet, ip, arp ...). satp directly includes cryptography and
   9  *  message authentication based on the methodes used by SRTP.  It is
  10  *  intended to deliver a generic, scaleable and secure solution for
  11  *  tunneling and relaying of packets of any protocol.
  12  *
  13  *
  14  *  Copyright (C) 2007-2008 Othmar Gsenger, Erwin Nindl,
  15  *                          Christian Pointner <satp@wirdorange.org>
  16  *
  17  *  This file is part of Anytun.
  18  *
  19  *  Anytun is free software: you can redistribute it and/or modify
  20  *  it under the terms of the GNU General Public License version 3 as
  21  *  published by the Free Software Foundation.
  22  *
  23  *  Anytun is distributed in the hope that it will be useful,
  24  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  25  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  26  *  GNU General Public License for more details.
  27  *
  28  *  You should have received a copy of the GNU General Public License
  29  *  along with anytun.  If not, see <http://www.gnu.org/licenses/>.
  30  */
  31
  32 #include <iostream>
  33
  34 #include <boost/asio.hpp>
  35
  36 #include <fcntl.h>
  37 #include <pwd.h>
  38 #include <grp.h>
  39
  40 #include "../datatypes.h"
  41
  42 #include "../log.h"
  43 #include "../signalController.h"
  44 #include "../buffer.h"
  45 #include "connectionList.h"
  46 #include "rtpSessionTable.h"
  47 #include "syncRtpCommand.h"
  48 #include "../syncQueue.h"
  49 #include "../syncClient.h"
  50 #include "syncOnConnect.hpp"
  51
  52 #include "../threadUtils.hpp"
  53
  54 #include "commandHandler.h"
  55 #include "callIdQueue.h"
  56
  57 #include "options.h"
  58 #include "portWindow.h"
  59 #include <map>
  60 #include <fstream>
  61
  62 #define MAX_PACKET_SIZE 1500
  63
  64 void listener(RtpSession::proto::socket* sock1, RtpSession::proto::socket* sock2, std::string call_id, int dir, SyncQueue* queue, bool* running)
  65 {
  66   cLog.msg(Log::PRIO_NOTICE) << "listener(" << call_id << "/" << dir << ") started";
  67
  68   try
  69   {
  70     Buffer buf(u_int32_t(MAX_PACKET_SIZE));
  71     RtpSession::proto::endpoint remote_end;
  72
  73     while(1) {
  74       buf.setLength(MAX_PACKET_SIZE);
  75       u_int32_t len=0;
  76       if(dir == 1)
  77         len = 0;//sock1->recvFromNonBlocking(buf.getBuf(), buf.getLength(), remote_end, 1000);
  78       else if(dir == 2)
  79         len = 0; //sock2->recvFromNonBlocking(buf.getBuf(), buf.getLength(), remote_end, 1000);
  80                         else break;
  81
  82       RtpSession& session = gRtpSessionTable.getSession(call_id);
  83       if(session.isDead()) {
  84         cLog.msg(Log::PRIO_NOTICE) << "listener(" << call_id << "/" << dir << ") session is dead, exiting";
  85         break;
  86       }
  87
  88       if(!len)
  89         continue;
  90       buf.setLength(len);
  91
  92       if((dir == 1 && remote_end != session.getRemoteEnd1()) ||
  93          (dir == 2 && remote_end != session.getRemoteEnd2()))
  94       {
  95         if(gOpt.getNat() ||
  96            (!gOpt.getNoNatOnce() && ((dir == 1 && !session.getSeen1()) ||
  97                                      (dir == 2 && !session.getSeen2()))))
  98         {
  99           cLog.msg(Log::PRIO_NOTICE) << "listener(" << call_id << "/" << dir << ") setting remote host to "
 100                                      << remote_end;
 101           if(dir == 1)
 102             session.setRemoteEnd1(remote_end);
 103           if(dir == 2)
 104             session.setRemoteEnd2(remote_end);
 105
 106           if(!gOpt.getNat()) { // with nat enabled sync is not needed
 107             SyncRtpCommand sc(call_id);
 108             queue->push(sc);
 109           }
 110         }
 111         else
 112           continue;
 113                         }
 114       session.setSeen1();
 115       session.setSeen2();
 116
 117       if(dir == 1)
 118         sock2->send_to(boost::asio::buffer(buf.getBuf(), buf.getLength()), session.getRemoteEnd2());
 119       else if(dir == 2)
 120         sock1->send_to(boost::asio::buffer(buf.getBuf(), buf.getLength()), session.getRemoteEnd1());
 121       else break;
 122     }
 123   }
 124   catch(std::exception &e)
 125   {
 126     cLog.msg(Log::PRIO_ERR) << "listener(" << call_id << "/" << dir << ") exiting because: " << e.what();
 127   }
 128   *running = false;
 129   gCallIdQueue.push(call_id);
 130 }
 131
 132 class ListenerData
 133 {
 134 public:
 135   ListenerData() : sock1_(ios1_), sock2_(ios2_) {}
 136
 137   boost::asio::io_service ios1_;
 138   boost::asio::io_service ios2_;
 139   RtpSession::proto::socket sock1_;
 140   RtpSession::proto::socket sock2_;
 141   boost::thread* thread1_;
 142   boost::thread* thread2_;
 143   bool running1_;
 144   bool running2_;
 145 };
 146
 147 void listenerManager(void* p)
 148 {
 149   SyncQueue* queue_ = reinterpret_cast<SyncQueue*>(p);
 150
 151   std::map<std::string, ListenerData*> listenerMap;
 152   while(1)
 153   {
 154     try
 155     {
 156       std::string call_id = gCallIdQueue.front(); // waits for semaphor and returns next call_id
 157       gCallIdQueue.pop();
 158
 159       RtpSession& session = gRtpSessionTable.getSession(call_id);
 160       if(!session.isComplete())
 161         continue;
 162
 163       std::map<std::string, ListenerData*>::iterator it;
 164       it = listenerMap.find(call_id);
 165       if(it == listenerMap.end()) // listener Threads not existing yet
 166       {
 167         ListenerData* ld = new ListenerData();
 168
 169         ld->sock1_.open(session.getLocalEnd1().protocol());
 170         ld->sock1_.bind(session.getLocalEnd1());
 171
 172         ld->sock2_.open(session.getLocalEnd2().protocol());
 173         ld->sock2_.bind(session.getLocalEnd2());
 174
 175         ld->thread1_ = new boost::thread(boost::bind(listener, &(ld->sock1_), &(ld->sock2_), call_id, 1, queue_, &(ld->running1_)));
 176         ld->thread2_ = new boost::thread(boost::bind(listener, &(ld->sock1_), &(ld->sock2_), call_id, 2, queue_, &(ld->running2_)));
 177
 178         std::pair<std::map<std::string, ListenerData*>::iterator, bool> ret;
 179         ret = listenerMap.insert(std::map<std::string, ListenerData*>::value_type(call_id, ld));
 180         continue;
 181       }
 182
 183       if(!it->second->running1_ && !it->second->running2_)
 184       {
 185         cLog.msg(Log::PRIO_NOTICE) << "listenerManager both threads for '" << call_id << "' exited, cleaning up";
 186         if(it->second->thread1_) {
 187           it->second->thread1_->join();
 188           delete it->second->thread1_;
 189         }
 190         if(it->second->thread2_) {
 191           it->second->thread2_->join();
 192           delete it->second->thread2_;
 193         }
 194         delete it->second;
 195         listenerMap.erase(it);
 196         gRtpSessionTable.delSession(call_id);
 197         continue;
 198       }
 199           // TODO: reinit if session changed
 200     }
 201     catch(std::exception &e)
 202     {
 203       cLog.msg(Log::PRIO_ERR) << "listenerManager restarting after exception: " << e.what();
 204       usleep(500); // in case of an hard error don't block cpu (this is ugly)
 205     }
 206   }
 207   cLog.msg(Log::PRIO_ERR) << "listenerManager exiting because of unknown reason";
 208 }
 209
 210 void chrootAndDrop(string const& chrootdir, string const& username)
 211 {
 212         if (getuid() != 0)
 213         {
 214           std::cerr << "this programm has to be run as root in order to run in a chroot" << std::endl;
 215                 exit(-1);
 216         }
 217
 218   struct passwd *pw = getpwnam(username.c_str());
 219         if(pw) {
 220                 if(chroot(chrootdir.c_str()))
 221                 {
 222       std::cerr << "can't chroot to " << chrootdir << std::endl;
 223       exit(-1);
 224                 }
 225     std::cout << "we are in chroot jail (" << chrootdir << ") now" << std::endl;
 226     chdir("/");
 227                 if (initgroups(pw->pw_name, pw->pw_gid) || setgid(pw->pw_gid) || setuid(pw->pw_uid))
 228                 {
 229                         std::cerr << "can't drop to user " << username << " " << pw->pw_uid << ":" << pw->pw_gid << std::endl;
 230                         exit(-1);
 231                 }
 232     std::cout << "dropped user to " << username << " " << pw->pw_uid << ":" << pw->pw_gid << std::endl;
 233         }
 234         else
 235   {
 236     std::cerr << "unknown user " << username << std::endl;
 237     exit(-1);
 238         }
 239 }
 240
 241 void daemonize()
 242 {
 243   pid_t pid;
 244
 245   pid = fork();
 246   if(pid) exit(0);
 247   setsid();
 248   pid = fork();
 249   if(pid) exit(0);
 250
 251 //  std::cout << "running in background now..." << std::endl;
 252
 253   int fd;
 254 //  for (fd=getdtablesize();fd>=0;--fd) // close all file descriptors
 255   for (fd=0;fd<=2;fd++) // close all file descriptors
 256     close(fd);
 257   fd=open("/dev/null",O_RDWR);        // stdin
 258   dup(fd);                            // stdout
 259   dup(fd);                            // stderr
 260   umask(027);
 261 }
 262
 263 class ThreadParam
 264 {
 265 public:
 266   ThreadParam(SyncQueue & queue_,OptionConnectTo & connto_)
 267     : queue(queue_),connto(connto_)
 268     {};
 269   SyncQueue & queue;
 270   OptionConnectTo & connto;
 271 };
 272
 273 void syncConnector(void* p)
 274 {
 275         ThreadParam* param = reinterpret_cast<ThreadParam*>(p);
 276
 277         SyncClient sc ( param->connto.host, param->connto.port);
 278         sc.run();
 279 }
 280
 281 void syncListener(SyncQueue * queue)
 282 {
 283   try
 284   {
 285     boost::asio::io_service io_service;
 286                 SyncTcpConnection::proto::resolver resolver(io_service);
 287                 SyncTcpConnection::proto::endpoint e;
 288                 if(gOpt.getLocalSyncAddr()!="")
 289                 {
 290                         SyncTcpConnection::proto::resolver::query query(gOpt.getLocalSyncAddr(), gOpt.getLocalSyncPort());
 291                         e = *resolver.resolve(query);
 292                 } else {
 293                         SyncTcpConnection::proto::resolver::query query(gOpt.getLocalSyncPort());
 294                         e = *resolver.resolve(query);
 295                 }
 296
 297
 298     SyncServer server(io_service,e);
 299                 server.onConnect=boost::bind(syncOnConnect,_1);
 300                 queue->setSyncServerPtr(&server);
 301     io_service.run();
 302   }
 303   catch (std::exception& e)
 304   {
 305     std::string addr = gOpt.getLocalSyncAddr() == "" ? "*" : gOpt.getLocalSyncAddr();
 306     cLog.msg(Log::PRIO_ERR) << "sync: cannot bind to " << addr << ":" << gOpt.getLocalSyncPort()
 307                             << " (" << e.what() << ")" << std::endl;
 308   }
 309
 310 }
 311
 312 int main(int argc, char* argv[])
 313 {
 314 //  std::cout << "anyrtpproxy" << std::endl;
 315   if(!gOpt.parse(argc, argv))
 316   {
 317     gOpt.printUsage();
 318     exit(-1);
 319   }
 320
 321   cLog.setLogName("anyrtpproxy");
 322   cLog.msg(Log::PRIO_NOTICE) << "anyrtpproxy started...";
 323
 324   std::ofstream pidFile;
 325   if(gOpt.getPidFile() != "") {
 326     pidFile.open(gOpt.getPidFile().c_str());
 327     if(!pidFile.is_open()) {
 328       std::cout << "can't open pid file" << std::endl;
 329     }
 330   }
 331
 332   if(gOpt.getChroot())
 333     chrootAndDrop(gOpt.getChrootDir(), gOpt.getUsername());
 334   if(gOpt.getDaemonize())
 335     daemonize();
 336
 337   if(pidFile.is_open()) {
 338     pid_t pid = getpid();
 339     pidFile << pid;
 340     pidFile.close();
 341   }
 342
 343   SignalController sig;
 344   sig.init();
 345
 346   SyncQueue queue;
 347
 348
 349   boost::thread listenerManagerThread(boost::bind(listenerManager,&queue));
 350
 351
 352 // #ifndef ANYTUN_NOSYNC
 353 //     boost::thread * syncListenerThread;
 354 //     if(gOpt.getLocalSyncPort() != "")
 355 //       syncListenerThread = new boost::thread(boost::bind(syncListener,&queue));
 356
 357 //     std::list<boost::thread *> connectThreads;
 358 //     for(ConnectToList::iterator it = connect_to.begin() ;it != connect_to.end(); ++it) {
 359 //       ThreadParam * point = new ThreadParam(dev, *src, cl, queue,*it);
 360 //       connectThreads.push_back(new boost::thread(boost::bind(syncConnector,point)));
 361 //     }
 362 // #endif
 363
 364
 365
 366 //   pthread_t syncListenerThread;
 367
 368 //      ConnectToList connect_to = gOpt.getConnectTo();
 369 //      ThreadParam p( queue,*(new OptionConnectTo()));
 370 //   if ( gOpt.getLocalSyncPort())
 371 //     pthread_create(&syncListenerThread, NULL, syncListener, &p);
 372
 373 //   std::list<pthread_t> connectThreads;
 374 //   for(ConnectToList::iterator it = connect_to.begin() ;it != connect_to.end(); ++it)
 375 //   {
 376 //     connectThreads.push_back(pthread_t());
 377 //     ThreadParam * point = new ThreadParam(queue,*it);
 378 //     pthread_create(& connectThreads.back(),  NULL, syncConnector, point);
 379 //   }
 380
 381         PortWindow port_window(gOpt.getRtpStartPort(),gOpt.getRtpEndPort());
 382   CommandHandler cmd(queue, gOpt.getControlInterface().addr_, gOpt.getControlInterface().port_,port_window);
 383
 384   int ret = sig.run();
 385   return ret;
 386 }
 387