Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -0500 | [diff] [blame] | 1 | /* |
Alexandre Lision | e24852d | 2014-02-04 13:13:02 -0500 | [diff] [blame^] | 2 | Copyright (C) 2006-2010 Werner Dittmann |
Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -0500 | [diff] [blame] | 3 | |
| 4 | This program is free software: you can redistribute it and/or modify |
Alexandre Lision | e24852d | 2014-02-04 13:13:02 -0500 | [diff] [blame^] | 5 | it under the terms of the GNU General Public License as published by |
Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -0500 | [diff] [blame] | 6 | the Free Software Foundation, either version 3 of the License, or |
| 7 | (at your option) any later version. |
| 8 | |
| 9 | This program is distributed in the hope that it will be useful, |
| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | GNU General Public License for more details. |
| 13 | |
| 14 | You should have received a copy of the GNU General Public License |
| 15 | along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 16 | */ |
| 17 | |
| 18 | /* |
| 19 | * Authors: Werner Dittmann <Werner.Dittmann@t-online.de> |
| 20 | */ |
| 21 | |
| 22 | #ifndef _ZRTPPACKETBASE_H_ |
| 23 | #define _ZRTPPACKETBASE_H_ |
| 24 | |
| 25 | /** |
| 26 | * @file ZrtpPacketBase.h |
| 27 | * @brief The ZRTP message header class |
| 28 | * |
| 29 | * This class defines the ZRTP message header and provides access and |
| 30 | * check methods. |
| 31 | * |
| 32 | * @ingroup GNU_ZRTP |
| 33 | * @{ |
| 34 | */ |
| 35 | |
| 36 | #include <stdio.h> |
| 37 | #include <stdint.h> |
| 38 | #include <string.h> |
| 39 | #include <stdlib.h> |
Alexandre Lision | e24852d | 2014-02-04 13:13:02 -0500 | [diff] [blame^] | 40 | #include <netinet/in.h> |
Alexandre Lision | 907ed2e | 2014-02-04 10:33:09 -0500 | [diff] [blame] | 41 | |
Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -0500 | [diff] [blame] | 42 | #include <libzrtpcpp/zrtpPacket.h> |
| 43 | #include <libzrtpcpp/ZrtpTextData.h> |
| 44 | #include <libzrtpcpp/ZrtpConfigure.h> |
| 45 | #include <libzrtpcpp/ZrtpCrc32.h> |
| 46 | |
| 47 | // #define DEBUGOUT(deb) deb |
| 48 | #define DEBUGOUT(deb) |
| 49 | |
| 50 | /* |
| 51 | * This is the unique ZRTP ID in network order (PZ) |
| 52 | */ |
| 53 | const uint16_t zrtpId = 0x505a; |
| 54 | |
| 55 | /** |
| 56 | * This is the base class for all ZRTP packets |
| 57 | * |
| 58 | * All other ZRTP packet classes inherit from this class. It does not have |
| 59 | * an implementation of its own. |
| 60 | * |
| 61 | * The standard constructors of the subclasses usually initialize the @c allocate |
| 62 | * field with their fixed data array which is large enough to hold all message |
| 63 | * data. If an implementation needs to change this to use dynamic memory |
| 64 | * allocation only that line in the subclasses must be changed and the destructors |
| 65 | * should take care of memory management. |
| 66 | * |
| 67 | * @author Werner Dittmann <Werner.Dittmann@t-online.de> |
| 68 | */ |
| 69 | |
| 70 | class __EXPORT ZrtpPacketBase { |
| 71 | |
| 72 | private: |
| 73 | |
| 74 | protected: |
| 75 | void* allocated; ///< Pointer to ZRTP message data |
| 76 | zrtpPacketHeader_t* zrtpHeader; ///< points to the fixed ZRTP header structure |
| 77 | |
| 78 | public: |
| 79 | /** |
| 80 | * Destructor is empty |
| 81 | */ |
| 82 | virtual ~ZrtpPacketBase() {}; |
| 83 | |
| 84 | /** |
| 85 | * Get pointer to ZRTP header |
| 86 | * |
| 87 | * @return |
| 88 | * Pointer to ZRTP header structure. |
| 89 | */ |
| 90 | const uint8_t* getHeaderBase() { return (const uint8_t*)zrtpHeader; }; |
| 91 | |
| 92 | /** |
| 93 | * Check is this is a ZRTP message |
| 94 | * |
| 95 | * @return |
| 96 | * @c true if check was ok |
| 97 | */ |
Alexandre Lision | e24852d | 2014-02-04 13:13:02 -0500 | [diff] [blame^] | 98 | bool isZrtpPacket() { return (ntohs(zrtpHeader->zrtpId) == zrtpId); }; |
Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -0500 | [diff] [blame] | 99 | |
| 100 | /** |
| 101 | * Get the length in words of the ZRTP message |
| 102 | * |
| 103 | * @return |
| 104 | * The length in words |
| 105 | */ |
Alexandre Lision | e24852d | 2014-02-04 13:13:02 -0500 | [diff] [blame^] | 106 | uint16_t getLength() { return ntohs(zrtpHeader->length); }; |
Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -0500 | [diff] [blame] | 107 | |
| 108 | /** |
| 109 | * Return pointer to fixed length message type ASCII data |
| 110 | * |
| 111 | * @return |
| 112 | * Pointer to ASCII character array |
| 113 | */ |
| 114 | uint8_t* getMessageType() { return zrtpHeader->messageType; }; |
| 115 | |
| 116 | /** |
| 117 | * Set the lenght field in the ZRTP header |
| 118 | * |
| 119 | * @param len |
| 120 | * The length of the ZRTP message in words, host order |
| 121 | */ |
Alexandre Lision | e24852d | 2014-02-04 13:13:02 -0500 | [diff] [blame^] | 122 | void setLength(uint16_t len) { zrtpHeader->length = htons(len); }; |
Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -0500 | [diff] [blame] | 123 | |
| 124 | /** |
| 125 | * Copy the message type ASCII data to ZRTP message type field |
| 126 | * |
| 127 | * @param msg |
| 128 | * Pointer to message type ASCII character array |
| 129 | */ |
| 130 | void setMessageType(uint8_t *msg) |
| 131 | { memcpy(zrtpHeader->messageType, msg, sizeof(zrtpHeader->messageType)); }; |
| 132 | |
| 133 | /** |
| 134 | * Initializes the ZRTP Id field |
| 135 | */ |
Alexandre Lision | e24852d | 2014-02-04 13:13:02 -0500 | [diff] [blame^] | 136 | void setZrtpId() { zrtpHeader->zrtpId = htons(zrtpId); } |
Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -0500 | [diff] [blame] | 137 | }; |
| 138 | |
| 139 | /** |
| 140 | * @} |
| 141 | */ |
| 142 | #endif // ZRTPPACKETBASE |