src/anyrtpproxy/commandHandler.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 <sstream>
  33 #include <vector>
  34
  35 #include <iomanip>
  36 #include <iostream>
  37 #include <sstream>
  38
  39 #include <boost/bind.hpp>
  40
  41 #include "commandHandler.h"
  42 #include "../buffer.h"
  43 #include "../log.h"
  44 #include "../syncQueue.h"
  45 #include "syncRtpCommand.h"
  46 #include "rtpSessionTable.h"
  47 #include "callIdQueue.h"
  48 #include "options.h"
  49
  50 #define MAX_COMMAND_LENGTH 1000
  51
  52 CommandHandler::CommandHandler(SyncQueue& q, std::string lp,PortWindow & pw) : thread_(boost::bind(run,this)),
  53                                                                                queue_(q), running_(true), control_sock_(io_service_),
  54                                                                                local_address_(""), local_port_(lp),port_window_(pw)
  55 {
  56   proto::resolver resolver(io_service_);
  57   proto::resolver::query query(local_port_);
  58   proto::endpoint e = *resolver.resolve(query);
  59   control_sock_.open(e.protocol());
  60   control_sock_.bind(e);
  61 }
  62
  63 CommandHandler::CommandHandler(SyncQueue& q, string la, std::string lp, PortWindow & pw) : thread_(boost::bind(run,this)),
  64                                                                                            queue_(q), running_(true), control_sock_(io_service_),
  65                                                                                            local_address_(la), local_port_(lp),port_window_(pw)
  66 {
  67   proto::resolver resolver(io_service_);
  68   proto::resolver::query query(local_address_, local_port_);
  69   proto::endpoint e = *resolver.resolve(query);
  70   control_sock_.open(e.protocol());
  71   control_sock_.bind(e);
  72 }
  73
  74 void CommandHandler::run(void* s)
  75 {
  76   CommandHandler* self = reinterpret_cast<CommandHandler*>(s);
  77
  78   Buffer buf(u_int32_t(MAX_COMMAND_LENGTH));
  79   try
  80   {
  81     proto::endpoint remote_end;
  82
  83     int len;
  84     while(1)
  85     {
  86       buf.setLength(MAX_COMMAND_LENGTH);
  87
  88       len = self->control_sock_.receive_from(boost::asio::buffer(buf.getBuf(), buf.getLength()), remote_end);
  89       buf.setLength(len);
  90
  91       std::string ret = self->handle(std::string(reinterpret_cast<char*>(buf.getBuf()), buf.getLength())); // TODO: reinterpret is ugly
  92
  93       cLog.msg(Log::PRIO_DEBUG) << "CommandHandler received Command from " << remote_end << ", ret='" << ret << "'";
  94
  95       self->control_sock_.send_to(boost::asio::buffer(ret.c_str(), ret.length()), remote_end);
  96     }
  97   }
  98   catch(std::exception& e)
  99   {
 100     self->running_ = false;
 101   }
 102   self->running_ = false;
 103 }
 104
 105 bool CommandHandler::isRunning()
 106 {
 107   return running_;
 108 }
 109
 110
 111
 112 std::string CommandHandler::handle(std::string command)
 113 {
 114   istringstream iss(command);
 115   ostringstream oss;
 116   std::string cookie;
 117   std::string cmd;
 118
 119   iss >> cookie;
 120   oss << cookie << " ";
 121
 122   if(iss.bad() || iss.eof()) {
 123     oss << RET_ERR_SYNTAX;
 124     return oss.str();
 125   }
 126   iss >> cmd;
 127
 128   std::vector<std::string> params;
 129   while(!iss.bad() && !iss.eof()) {
 130     std::string tmp;
 131     iss >> tmp;
 132     params.push_back(tmp);
 133   }
 134
 135   switch(std::toupper(cmd[0]))
 136   {
 137   case CMD_REQUEST:
 138     if(params.size() < 4) { oss << RET_ERR_SYNTAX; break; }
 139     oss << handleRequest(cmd.erase(0,1), params[0], params[1], params[2], params[3], (params.size() < 5) ? "" : params[4]);
 140     break;
 141   case CMD_RESPONSE:
 142     if(params.size() < 4) { oss << RET_ERR_SYNTAX; break; }
 143     oss << handleResponse(cmd.erase(0,1), params[0], params[1], params[2], params[3], (params.size() < 5) ? "" : params[4]);
 144     break;
 145   case CMD_DELETE:
 146     if(params.size() < 2) { oss << RET_ERR_SYNTAX; break; }
 147     oss << handleDelete(params[0], params[1], (params.size() < 3) ? "" : params[2]);
 148     break;
 149   case CMD_VERSION:
 150     if(cmd.length() > 1 && cmd[1] == 'F') {
 151       if(params.size() < 1) { oss << RET_ERR_SYNTAX; break; }
 152       oss << handleVersionF(params[0]);
 153       break;
 154     }
 155     oss << handleVersion();
 156     break;
 157   case CMD_INFO:
 158     oss << handleInfo();
 159     break;
 160   default:
 161     oss << RET_ERR_SYNTAX;
 162     break;
 163   }
 164
 165   return oss.str();
 166 }
 167
 168 string CommandHandler::handleRequest(string modifiers, string call_id, string addr, string port, string from_tag, string to_tag)
 169 {
 170   std::cout << "received request[" << modifiers << "] command ('" << call_id << "','" << addr  << "','" << port
 171             << "','" << from_tag << "','" << to_tag << "')" << std::endl;
 172
 173   try
 174   {
 175     RtpSession::proto::resolver resolver(io_service_);
 176     bool is_new;
 177     RtpSession& session = gRtpSessionTable.getOrNewSession(call_id, is_new);
 178     if(is_new)
 179     {
 180       u_int16_t port1 = port_window_.newPort(); // TODO: get next available port
 181       u_int16_t port2 = port_window_.newPort(); // TODO: get next available port
 182                         if( !port1 || !port2)
 183                         {
 184                                 if( port1) port_window_.freePort(port1);
 185                                 if( port2) port_window_.freePort(port2);
 186                                 throw std::runtime_error("no free port found");
 187                         }
 188       std::stringstream ps1, ps2;
 189       ps1 << port1;
 190       ps2 << port2;
 191
 192       RtpSession::proto::endpoint e1, e2;
 193       if(gOpt.getLocalAddr() == "") {
 194         RtpSession::proto::resolver::query query1(ps1.str());
 195         e1 = *resolver.resolve(query1);
 196         RtpSession::proto::resolver::query query2(ps2.str());
 197         e2 = *resolver.resolve(query2);
 198       }
 199       else {
 200         RtpSession::proto::resolver::query query1(gOpt.getLocalAddr(),ps1.str());
 201         e1 = *resolver.resolve(query1);
 202         RtpSession::proto::resolver::query query2(gOpt.getLocalAddr(),ps2.str());
 203         e2 = *resolver.resolve(query2);
 204       }
 205
 206       session.setLocalEnd1(e1);
 207       session.setLocalEnd2(e2);
 208     }
 209     RtpSession::proto::resolver::query query(addr,port);
 210     session.setRemoteEnd1(*resolver.resolve(query));
 211
 212     ostringstream oss;
 213     oss << session.getLocalEnd2().port();
 214     return oss.str();
 215   }
 216   catch(std::exception& e)
 217   {
 218     return RET_ERR_UNKNOWN; // TODO: change to corret error value
 219   }
 220 }
 221
 222 string CommandHandler::handleResponse(string modifiers, string call_id, string addr, string port, string from_tag, string to_tag)
 223 {
 224   std::cout << "received response[" << modifiers << "] command ('" << call_id << "','" << addr  << "','" << port
 225             << "','" << from_tag << "','" << to_tag << "')" << std::endl;
 226
 227   try
 228   {
 229     RtpSession& session = gRtpSessionTable.getSession(call_id);
 230     RtpSession::proto::resolver resolver(io_service_);
 231     RtpSession::proto::resolver::query query(addr,port);
 232     session.setRemoteEnd2(*resolver.resolve(query));
 233     session.isComplete(true);
 234     SyncRtpCommand sc(call_id);
 235     queue_.push(sc);
 236
 237     ostringstream oss;
 238     oss << session.getLocalEnd1().port();
 239     return oss.str();
 240   }
 241   catch(std::exception& e)
 242   {
 243     return RET_ERR_UNKNOWN; // TODO: change to corret error value
 244   }
 245 }
 246
 247 string CommandHandler::handleDelete(string call_id, string from_tag, string to_tag)
 248 {
 249   std::cout << "received delete command ('" << call_id << "','" << from_tag << "','" << to_tag << "')" << std::endl;
 250
 251   try
 252   {
 253     RtpSession& session = gRtpSessionTable.getSession(call_id);
 254     session.isDead(true);
 255     SyncRtpCommand sc(call_id);
 256     queue_.push(sc);
 257
 258     return RET_OK;
 259   }
 260   catch(std::exception& e)
 261   {
 262     return RET_ERR_UNKNOWN; // TODO: change to corret error value
 263   }
 264 }
 265
 266 string CommandHandler::handleVersion()
 267 {
 268   std::cout << "received version command" << std::endl;
 269   return BASE_VERSION;
 270 }
 271
 272 string CommandHandler::handleVersionF(string date_code)
 273 {
 274   std::cout << "received version[F] command ('" << date_code << "')" << std::endl;
 275   if(!date_code.compare(SUP_VERSION))
 276     return "1";
 277
 278   return "0";
 279 }
 280
 281 string CommandHandler::handleInfo()
 282 {
 283   std::cout << "received info command, ignoring" << std::endl;
 284   return RET_OK;
 285 }
 286