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105 lines
2.9 KiB
C++
105 lines
2.9 KiB
C++
/*
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* Hans - IP over ICMP
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* Copyright (C) 2009 Friedrich Schöller <hans@schoeller.se>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#ifndef WORKER_H
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#define WORKER_H
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#include "time.h"
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#include "echo.h"
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#include "tun.h"
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#include <string>
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class Worker
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{
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public:
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Worker(int tunnelMtu, const char *deviceName, bool answerEcho, uid_t uid, gid_t gid);
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virtual ~Worker();
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virtual void run();
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static int headerSize() { return sizeof(TunnelHeader); }
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protected:
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struct TunnelHeader
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{
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struct Magic
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{
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Magic() { }
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Magic(const char *magic);
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bool operator==(const Magic &other) const;
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bool operator!=(const Magic &other) const;
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char data[4];
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};
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Magic magic;
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uint8_t type;
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enum Type
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{
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TYPE_RESET_CONNECTION = 1,
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TYPE_CONNECTION_REQUEST = 2,
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TYPE_CHALLENGE = 3,
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TYPE_CHALLENGE_RESPONSE = 4,
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TYPE_CONNECTION_ACCEPT = 5,
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TYPE_CHALLENGE_ERROR = 6,
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TYPE_DATA = 7,
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TYPE_POLL = 8,
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TYPE_SERVER_FULL = 9
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};
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}; // size = 5
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virtual bool handleEchoData(const TunnelHeader &header, int dataLength, uint32_t realIp, bool reply, uint16_t id, uint16_t seq) { return true; }
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virtual void handleTunData(int dataLength, uint32_t sourceIp, uint32_t destIp) { } // to echoSendPayloadBuffer
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virtual void handleTimeout() { }
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void sendEcho(const TunnelHeader::Magic &magic, int type, int length, uint32_t realIp, bool reply, uint16_t id, uint16_t seq);
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void sendToTun(int length); // from echoReceivePayloadBuffer
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void setTimeout(Time delta);
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char *echoSendPayloadBuffer() { return echo->sendPayloadBuffer() + sizeof(TunnelHeader); }
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char *echoReceivePayloadBuffer() { return echo->receivePayloadBuffer() + sizeof(TunnelHeader); }
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int payloadBufferSize() { return tunnelMtu; }
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void dropPrivileges();
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Echo *echo;
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Tun *tun;
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bool alive;
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bool answerEcho;
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int tunnelMtu;
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int maxTunnelHeaderSize;
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uid_t uid;
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gid_t gid;
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bool privilegesDropped;
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Time now;
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private:
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int readIcmpData(int *realIp, int *id, int *seq);
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Time nextTimeout;
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};
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#endif
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