/* * anytun * * The secure anycast tunneling protocol (satp) defines a protocol used * for communication between any combination of unicast and anycast * tunnel endpoints. It has less protocol overhead than IPSec in Tunnel * mode and allows tunneling of every ETHER TYPE protocol (e.g. * ethernet, ip, arp ...). satp directly includes cryptography and * message authentication based on the methodes used by SRTP. It is * intended to deliver a generic, scaleable and secure solution for * tunneling and relaying of packets of any protocol. * * * Copyright (C) 2007 anytun.org * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 * as published by the Free Software Foundation. * * 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 (see the file COPYING included with this * distribution); if not, write to the Free Software Foundation, Inc., * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include #include #include #include #include "commandHandler.h" #include "../buffer.h" #include "../log.h" #include "../syncQueue.h" #include "../syncCommand.h" #include "../rtpSessionTable.h" #include "callIdQueue.h" #include "options.h" #define MAX_COMMAND_LENGTH 1000 CommandHandler::CommandHandler(SyncQueue& q, u_int16_t lp,PortWindow & pw) : queue_(q), running_(true), control_sock_(lp), local_address_("0.0.0.0"), local_port_(lp),port_window_(pw) { pthread_create(&thread_, NULL, run, this); } CommandHandler::CommandHandler(SyncQueue& q, string la, u_int16_t lp,PortWindow & pw) : queue_(q), running_(true), control_sock_(la, lp), local_address_(la), local_port_(lp),port_window_(pw) { pthread_create(&thread_, NULL, run, this); } CommandHandler::~CommandHandler() { pthread_cancel(thread_); pthread_join(thread_, NULL); } void* CommandHandler::run(void* s) { CommandHandler* self = reinterpret_cast(s); Buffer buf(u_int32_t(MAX_COMMAND_LENGTH)); try { string remote_host; u_int16_t remote_port; int len; while(1) { buf.setLength(MAX_COMMAND_LENGTH); len = self->control_sock_.recvFrom(buf.getBuf(), buf.getLength(), remote_host, remote_port); buf.setLength(len); std::string ret = self->handle(std::string(reinterpret_cast(buf.getBuf()), buf.getLength())); // TODO: reinterpret is ugly cLog.msg(Log::PRIO_DEBUG) << "CommandHandler received Command from " << remote_host << ":" << remote_port << ", ret='" << ret << "'"; self->control_sock_.sendTo(ret.c_str(), ret.length(), remote_host, remote_port); } } catch(SocketException &e) { self->running_ = false; pthread_exit(NULL); } self->running_ = false; pthread_exit(NULL); } bool CommandHandler::isRunning() { return running_; } std::string CommandHandler::handle(std::string command) { istringstream iss(command); ostringstream oss; std::string cookie; std::string cmd; iss >> cookie; oss << cookie << " "; if(iss.bad() || iss.eof()) { oss << RET_ERR_SYNTAX; return oss.str(); } iss >> cmd; std::vector params; while(!iss.bad() && !iss.eof()) { std::string tmp; iss >> tmp; params.push_back(tmp); } switch(std::toupper(cmd[0])) { case CMD_REQUEST: if(params.size() < 4) { oss << RET_ERR_SYNTAX; break; } oss << handleRequest(cmd.erase(0,1), params[0], params[1], params[2], params[3], (params.size() < 5) ? "" : params[4]); break; case CMD_RESPONSE: if(params.size() < 4) { oss << RET_ERR_SYNTAX; break; } oss << handleResponse(cmd.erase(0,1), params[0], params[1], params[2], params[3], (params.size() < 5) ? "" : params[4]); break; case CMD_DELETE: if(params.size() < 2) { oss << RET_ERR_SYNTAX; break; } oss << handleDelete(params[0], params[1], (params.size() < 3) ? "" : params[2]); break; case CMD_VERSION: if(cmd.length() > 1 && cmd[1] == 'F') { if(params.size() < 1) { oss << RET_ERR_SYNTAX; break; } oss << handleVersionF(params[0]); break; } oss << handleVersion(); break; case CMD_INFO: oss << handleInfo(); break; default: oss << RET_ERR_SYNTAX; break; } return oss.str(); } string CommandHandler::handleRequest(string modifiers, string call_id, string addr, string port, string from_tag, string to_tag) { std::cout << "received request[" << modifiers << "] command ('" << call_id << "','" << addr << "','" << port << "','" << from_tag << "','" << to_tag << "')" << std::endl; try { bool is_new; RtpSession& session = gRtpSessionTable.getOrNewSession(call_id, is_new); if(is_new) { u_int16_t port1 = port_window_.newPort(); // TODO: get next available port u_int16_t port2 = port_window_.newPort(); // TODO: get next available port if( !port1 || !port2) { if( port1) port_window_.freePort(port1); if( port2) port_window_.freePort(port2); throw std::runtime_error("no free port found"); } if(gOpt.getLocalAddr() == "") session.setLocalAddr("0.0.0.0"); else session.setLocalAddr(gOpt.getLocalAddr()); session.setLocalPort1(port1); session.setLocalPort2(port2); } istringstream iss(port); u_int16_t rport; iss >> rport; session.setRemotePort1(rport); session.setRemoteAddr1(addr); ostringstream oss; oss << session.getLocalPort2(); return oss.str(); } catch(std::exception& e) { return RET_ERR_UNKNOWN; // TODO: change to corret error value } } string CommandHandler::handleResponse(string modifiers, string call_id, string addr, string port, string from_tag, string to_tag) { std::cout << "received response[" << modifiers << "] command ('" << call_id << "','" << addr << "','" << port << "','" << from_tag << "','" << to_tag << "')" << std::endl; try { RtpSession& session = gRtpSessionTable.getSession(call_id); istringstream iss(port); u_int16_t rport; iss >> rport; session.setRemotePort2(rport); session.setRemoteAddr2(addr); session.isComplete(true); SyncCommand sc(call_id); queue_.push(sc); ostringstream oss; oss << session.getLocalPort1(); return oss.str(); } catch(std::exception& e) { return RET_ERR_UNKNOWN; // TODO: change to corret error value } } string CommandHandler::handleDelete(string call_id, string from_tag, string to_tag) { std::cout << "received delete command ('" << call_id << "','" << from_tag << "','" << to_tag << "')" << std::endl; try { RtpSession& session = gRtpSessionTable.getSession(call_id); session.isDead(true); SyncCommand sc(call_id); queue_.push(sc); return RET_OK; } catch(std::exception& e) { return RET_ERR_UNKNOWN; // TODO: change to corret error value } } string CommandHandler::handleVersion() { std::cout << "received version command" << std::endl; return BASE_VERSION; } string CommandHandler::handleVersionF(string date_code) { std::cout << "received version[F] command ('" << date_code << "')" << std::endl; if(!date_code.compare(SUP_VERSION)) return "1"; return "0"; } string CommandHandler::handleInfo() { std::cout << "received info command, ignoring" << std::endl; return RET_OK; }