weihnachtlicher checkin

* packet processing now with less memory operations than before 
* todo:
  * testing
  * set cipher / authalgo via commandline
  * set key operations for hmac calculation

1 files changed, 134 insertions, 0 deletions

diff --git a/encryptedPacket.h b/encryptedPacket.h
new file mode 100644
index 0000000..ffe9246
--- /dev/null
+++ b/encryptedPacket.h
@@ -0,0 +1,134 @@
+/*
+ *  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 <satp@wirdorange.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
+ */
+
+#ifndef _ENCRYPTED_PACKET_H_
+#define _ENCRYPTED_PACKET_H_
+
+#include "datatypes.h"
+#include "buffer.h"
+#include "authTag.h"
+
+class EncryptedPacket : public Buffer
+{
+public:
+
+  /**
+   * Packet constructor
+   * @param max_payload_length maximum length of encrypted payload
+   */
+  EncryptedPacket(u_int32_t max_payload_length);
+  
+  /**
+   * Get the sequence number
+   * @return seqence number
+   */
+  seq_nr_t getSeqNr() const;
+
+  /**
+   * Set the seqence number
+   * @param seq_nr sequence number
+   */
+  void setSeqNr(seq_nr_t seq_nr);
+
+  /**
+   * Get the sender id
+   * @return sender id
+   */
+  sender_id_t getSenderId() const;
+
+  /**
+   * Set the sender id
+   * @param sender_id sender id
+   */
+  void setSenderId(sender_id_t sender_id);
+
+  /**
+   * Get the mulitplex id
+   * @return multiplex id
+   */
+  mux_t getMux() const;
+
+  /**
+   * Set the multiplex id
+   * @param mux multiplex id
+   */
+  void setMux(mux_t mux);
+
+  /**
+   * Set the header of a packet
+   * @param seq_nr sequence number
+   * @param sender_id sender id
+   * @param mux multiplex id
+   */
+  void setHeader(seq_nr_t seq_nr, sender_id_t sender_id, mux_t mux);
+
+  /** 
+   * Get the maximum payload size
+   * @return maximum payload size
+   */
+  u_int32_t getSize() const;
+
+  /**
+   * Set the real length of the payload
+   * @param length the real length of the payload, has to be smaller than the maximum payload size!
+   */
+  void setLength(u_int32_t length);
+
+  bool hasAuthTag() const;
+  void withAuthTag(bool b);
+  AuthTag getAuthTag() const;
+  void setAuthTag(AuthTag& tag);
+
+                       
+//  bool hasHeader() const;
+//  Packet& withHeader(bool b);
+//  Packet& addHeader(seq_nr_t seq_nr, sender_id_t sender_id);
+//  Packet& withAuthTag(bool b);
+//  AuthTag getAuthTag() const;
+//  Packet& addAuthTag(AuthTag auth_tag);
+
+private:
+  EncryptedPacket();
+  EncryptedPacket(const EncryptedPacket &src);
+  struct HeaderStruct
+  {
+    seq_nr_t seq_nr;
+    sender_id_t sender_id;
+    mux_t mux;
+  }__attribute__((__packed__));
+
+  struct HeaderStruct* header_;
+  AuthTag* auth_tag_;
+  u_int32_t size_;
+
+  static const u_int32_t AUTHTAG_SIZE = 10;     // 10byte
+};
+
+#endif