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| | | /********** |
| | | This library is free software; you can redistribute it and/or modify it under |
| | | the terms of the GNU Lesser General Public License as published by the |
| | | Free Software Foundation; either version 3 of the License, or (at your |
| | | option) any later version. (See <http://www.gnu.org/copyleft/lesser.html>.) |
| | | |
| | | This library 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 Lesser General Public License for |
| | | more details. |
| | | |
| | | You should have received a copy of the GNU Lesser General Public License |
| | | along with this library; if not, write to the Free Software Foundation, Inc., |
| | | 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| | | **********/ |
| | | // "mTunnel" multicast access service |
| | | // Copyright (c) 1996-2017 Live Networks, Inc. All rights reserved. |
| | | // Encapsulation trailer for tunnels |
| | | // C++ header |
| | | |
| | | #ifndef _TUNNEL_ENCAPS_HH |
| | | #define _TUNNEL_ENCAPS_HH |
| | | |
| | | #ifndef _NET_ADDRESS_HH |
| | | #include "NetAddress.hh" |
| | | #endif |
| | | |
| | | typedef u_int16_t Cookie; |
| | | |
| | | class TunnelEncapsulationTrailer { |
| | | // The trailer is layed out as follows: |
| | | // bytes 0-1: source 'cookie' |
| | | // bytes 2-3: destination 'cookie' |
| | | // bytes 4-7: address |
| | | // bytes 8-9: port |
| | | // byte 10: ttl |
| | | // byte 11: command |
| | | |
| | | // Optionally, there may also be a 4-byte 'auxilliary address' |
| | | // (e.g., for 'source-specific multicast' preceding this) |
| | | // bytes -4 through -1: auxilliary address |
| | | |
| | | public: |
| | | Cookie& srcCookie() |
| | | { return *(Cookie*)byteOffset(0); } |
| | | Cookie& dstCookie() |
| | | { return *(Cookie*)byteOffset(2); } |
| | | u_int32_t& address() |
| | | { return *(u_int32_t*)byteOffset(4); } |
| | | Port& port() |
| | | { return *(Port*)byteOffset(8); } |
| | | u_int8_t& ttl() |
| | | { return *(u_int8_t*)byteOffset(10); } |
| | | u_int8_t& command() |
| | | { return *(u_int8_t*)byteOffset(11); } |
| | | |
| | | u_int32_t& auxAddress() |
| | | { return *(u_int32_t*)byteOffset(-4); } |
| | | |
| | | private: |
| | | inline char* byteOffset(int charIndex) |
| | | { return ((char*)this) + charIndex; } |
| | | }; |
| | | |
| | | const unsigned TunnelEncapsulationTrailerSize = 12; // bytes |
| | | const unsigned TunnelEncapsulationTrailerAuxSize = 4; // bytes |
| | | const unsigned TunnelEncapsulationTrailerMaxSize |
| | | = TunnelEncapsulationTrailerSize + TunnelEncapsulationTrailerAuxSize; |
| | | |
| | | // Command codes: |
| | | // 0: unused |
| | | const u_int8_t TunnelDataCmd = 1; |
| | | const u_int8_t TunnelJoinGroupCmd = 2; |
| | | const u_int8_t TunnelLeaveGroupCmd = 3; |
| | | const u_int8_t TunnelTearDownCmd = 4; |
| | | const u_int8_t TunnelProbeCmd = 5; |
| | | const u_int8_t TunnelProbeAckCmd = 6; |
| | | const u_int8_t TunnelProbeNackCmd = 7; |
| | | const u_int8_t TunnelJoinRTPGroupCmd = 8; |
| | | const u_int8_t TunnelLeaveRTPGroupCmd = 9; |
| | | // 0x0A through 0x10: currently unused. |
| | | const u_int8_t TunnelExtensionFlag = 0x80; // a flag, not a cmd code |
| | | const u_int8_t TunnelDataAuxCmd |
| | | = (TunnelExtensionFlag|TunnelDataCmd); |
| | | const u_int8_t TunnelJoinGroupAuxCmd |
| | | = (TunnelExtensionFlag|TunnelJoinGroupCmd); |
| | | const u_int8_t TunnelLeaveGroupAuxCmd |
| | | = (TunnelExtensionFlag|TunnelLeaveGroupCmd); |
| | | // Note: the TearDown, Probe, ProbeAck, ProbeNack cmds have no Aux version |
| | | // 0x84 through 0x87: currently unused. |
| | | const u_int8_t TunnelJoinRTPGroupAuxCmd |
| | | = (TunnelExtensionFlag|TunnelJoinRTPGroupCmd); |
| | | const u_int8_t TunnelLeaveRTPGroupAuxCmd |
| | | = (TunnelExtensionFlag|TunnelLeaveRTPGroupCmd); |
| | | // 0x8A through 0xFF: currently unused |
| | | |
| | | inline Boolean TunnelIsAuxCmd(u_int8_t cmd) { |
| | | return (cmd&TunnelExtensionFlag) != 0; |
| | | } |
| | | |
| | | #endif |