Emeric Vigier | 2f62582 | 2012-08-06 11:09:52 -0400 | [diff] [blame] | 1 | // Copyright (C) 2001,2002,2007 Federico Montesino Pouzols <fedemp@altern.org>. |
| 2 | // |
| 3 | // This program is free software; you can redistribute it and/or modify |
| 4 | // it under the terms of the GNU General Public License as published by |
| 5 | // the Free Software Foundation; either version 2 of the License, or |
| 6 | // (at your option) any later version. |
| 7 | // |
| 8 | // This program is distributed in the hope that it will be useful, |
| 9 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | // GNU General Public License for more details. |
| 12 | // |
| 13 | // You should have received a copy of the GNU General Public License |
| 14 | // along with this program; if not, write to the Free Software |
| 15 | // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 16 | // |
| 17 | // As a special exception, you may use this file as part of a free software |
| 18 | // library without restriction. Specifically, if other files instantiate |
| 19 | // templates or use macros or inline functions from this file, or you compile |
| 20 | // this file and link it with other files to produce an executable, this |
| 21 | // file does not by itself cause the resulting executable to be covered by |
| 22 | // the GNU General Public License. This exception does not however |
| 23 | // invalidate any other reasons why the executable file might be covered by |
| 24 | // the GNU General Public License. |
| 25 | // |
| 26 | // This exception applies only to the code released under the name GNU |
| 27 | // ccRTP. If you copy code from other releases into a copy of GNU |
| 28 | // ccRTP, as the General Public License permits, the exception does |
| 29 | // not apply to the code that you add in this way. To avoid misleading |
| 30 | // anyone as to the status of such modified files, you must delete |
| 31 | // this exception notice from them. |
| 32 | // |
| 33 | // If you write modifications of your own for GNU ccRTP, it is your choice |
| 34 | // whether to permit this exception to apply to your modifications. |
| 35 | // If you do not wish that, delete this exception notice. |
| 36 | // |
| 37 | |
| 38 | /** |
| 39 | * @file rtcppkt.cpp |
| 40 | * |
| 41 | * @short RTCPCompoundHandler class implementation. |
| 42 | **/ |
| 43 | |
| 44 | #include "private.h" |
| 45 | #include <ccrtp/rtcppkt.h> |
| 46 | |
| 47 | #ifdef CCXX_NAMESPACES |
| 48 | namespace ost { |
| 49 | #endif |
| 50 | |
| 51 | #if __BYTE_ORDER == __BIG_ENDIAN |
| 52 | const uint16 RTCPCompoundHandler::RTCP_VALID_MASK = (0xc000 | 0x2000 | 0xfe); |
| 53 | const uint16 RTCPCompoundHandler::RTCP_VALID_VALUE = ((CCRTP_VERSION << 14) | RTCPPacket::tSR); |
| 54 | #else |
| 55 | const uint16 RTCPCompoundHandler::RTCP_VALID_MASK = (0x00c0 | 0x0020 | 0xfe00); |
| 56 | const uint16 RTCPCompoundHandler::RTCP_VALID_VALUE = ((CCRTP_VERSION << 6) | (RTCPPacket::tSR << 8)); |
| 57 | #endif |
| 58 | |
| 59 | timeval |
| 60 | NTP2Timeval(uint32 msw, uint32 lsw) |
| 61 | { |
| 62 | struct timeval t; |
| 63 | t.tv_sec = msw - NTP_EPOCH_OFFSET; |
| 64 | t.tv_usec = (uint32)((((double)lsw) * 1000000.0) / ((uint32)(~0))); |
| 65 | return t; |
| 66 | } |
| 67 | |
| 68 | uint32 |
| 69 | timevalIntervalTo65536(timeval& t) |
| 70 | { |
| 71 | const uint32 f = 65536; |
| 72 | uint32 result = t.tv_sec * f; |
| 73 | result += (t.tv_usec << 12) / 125000 * 2; // * (4096 / 125000) * 2 |
| 74 | return result; |
| 75 | } |
| 76 | |
| 77 | timeval |
| 78 | microtimeout2Timeval(microtimeout_t to) |
| 79 | { |
| 80 | timeval result; |
| 81 | result.tv_sec = to % 1000000; |
| 82 | result.tv_usec = to / 1000000; |
| 83 | return result; |
| 84 | } |
| 85 | |
| 86 | RTCPCompoundHandler::RTCPCompoundHandler(uint16 mtu) : |
| 87 | rtcpSendBuffer(new unsigned char[mtu]), rtcpRecvBuffer(new unsigned char[mtu]), |
| 88 | pathMTU(mtu) |
| 89 | { |
| 90 | } |
| 91 | |
| 92 | RTCPCompoundHandler::~RTCPCompoundHandler() |
| 93 | { |
| 94 | #ifdef CCXX_EXCEPTIONS |
| 95 | try { |
| 96 | #endif |
| 97 | delete [] rtcpRecvBuffer; |
| 98 | #ifdef CCXX_EXCEPTIONS |
| 99 | } catch (...) {} |
| 100 | try { |
| 101 | #endif |
| 102 | delete [] rtcpSendBuffer; |
| 103 | #ifdef CCXX_EXCEPTIONS |
| 104 | } catch (...) {} |
| 105 | #endif |
| 106 | } |
| 107 | |
| 108 | bool |
| 109 | RTCPCompoundHandler::checkCompoundRTCPHeader(size_t len) |
| 110 | { |
| 111 | // Note that the first packet in the compount --in order to |
| 112 | // detect possibly misaddressed RTP packets-- is more |
| 113 | // thoroughly checked than the following. This mask checks the |
| 114 | // first packet's version, padding (must be zero) and type |
| 115 | // (must be SR or RR). |
| 116 | if ( (*(reinterpret_cast<uint16*>(rtcpRecvBuffer)) |
| 117 | & RTCP_VALID_MASK) |
| 118 | != RTCP_VALID_VALUE ) { |
| 119 | return false; |
| 120 | } |
| 121 | |
| 122 | // this checks that every packet in the compound is tagged |
| 123 | // with version == CCRTP_VERSION, and the length of the compound |
| 124 | // packet matches the addition of the packets lenghts |
| 125 | uint32 pointer = 0; |
| 126 | RTCPPacket* pkt; |
| 127 | do { |
| 128 | pkt = reinterpret_cast<RTCPPacket*> |
| 129 | (rtcpRecvBuffer + pointer); |
| 130 | pointer += (ntohs(pkt->fh.length)+1) << 2; |
| 131 | } while ( (pointer < len) && (CCRTP_VERSION == pkt->fh.version) ); |
| 132 | |
| 133 | if ( pointer != len ) |
| 134 | return false; |
| 135 | |
| 136 | return true; |
| 137 | } |
| 138 | |
| 139 | #ifdef CCXX_NAMESPACES |
| 140 | } |
| 141 | #endif |
| 142 | |
| 143 | /** EMACS ** |
| 144 | * Local variables: |
| 145 | * mode: c++ |
| 146 | * c-basic-offset: 4 |
| 147 | * End: |
| 148 | */ |