DTCP

Packets/MPEGDVBBundle/DtcpPacket.cc

+// Copyright (C) 2007 
+// Fraunhofer Institut fuer offene Kommunikationssysteme (FOKUS)
+// Kompetenzzentrum NETwork research (NET)
+//     David Wagner <david.wagner@fokus.fraunhofer.de>
+//
+#include "DtcpPacket.hh"

Packets/MPEGDVBBundle/DtcpPacket.hh

+// Copyright (C) 2007 
+// Fraunhofer Institut fuer offene Kommunikationssysteme (FOKUS)
+// Kompetenzzentrum NETwork research (NET)
+//     David Wagner <david.wagner@fokus.fraunhofer.de>
+//
+#ifndef DTCPPACKET_HH_
+#define DTCPPACKET_HH_
+
+#include "../../Packets/Packets.hh"
+#include "../../Packets/DefaultBundle/IpV4Packet.hh"
+#include "../../Packets/DefaultBundle/IpV6Packet.hh"
+
+namespace senf {
+    
+    //first we have to define some helpers
+    struct DTCPIpV4AddressListParser : public PacketParserBase {
+#       include SENF_PARSER()        
+        SENF_PARSER_PRIVATE_FIELD ( num_of_fbips, Parse_UInt8 );
+        SENF_PARSER_PRIVATE_FIELD ( reserved ,    Parse_UInt8 );   //must be zero 
+        SENF_PARSER_VEC_N         ( fbiplist,     num_of_fbips, Parse_INet4Address );
+
+	SENF_PARSER_FINALIZE(DTCPIpV4AddressListParser);
+    };
+        
+    struct DTCPIpV6AddressListParser : public PacketParserBase {
+#       include SENF_PARSER()        
+        SENF_PARSER_PRIVATE_FIELD ( num_of_fbips, Parse_UInt8 );
+        SENF_PARSER_PRIVATE_FIELD ( reserved,     Parse_UInt8 );   //must be zero 
+        SENF_PARSER_VEC_N         ( fbiplist,     num_of_fbips, Parse_INet6Address );
+
+	SENF_PARSER_FINALIZE(DTCPIpV6AddressListParser);
+    };
+
+    /** \brief Parse a DTCP packet
+
+        Parser implementing the DTCP packet according to RFC 3077
+        
+        \see DTCPPacketType
+     */
+    struct Parse_DTCPPacket : public PacketParserBase
+    {
+#       include SENF_PARSER()
+
+        SENF_PARSER_BITFIELD         ( version_number,       4, unsigned );  // =1 according to rfc3077
+        SENF_PARSER_BITFIELD         ( command,              4, unsigned );  // 1=JOIN 2=LEAVE
+        SENF_PARSER_FIELD            ( interval,             Parse_UInt8 );  // 5 according to rfc3077
+        SENF_PARSER_FIELD            ( sequence_number,      Parse_UInt16 );
+        SENF_PARSER_PRIVATE_BITFIELD ( reserved,             3, unsigned );
+        SENF_PARSER_BITFIELD         ( receive_capable_feed, 1, bool );      // 0=send only, 1=receive_capable_feed
+        SENF_PARSER_BITFIELD         ( ip_version,           4, unsigned );  // 4=IPv4, 6=IPv6
+        SENF_PARSER_FIELD            ( tunnel_protocol,      Parse_UInt8 ); 
+		/* Please consider the following comments on the implementation given in this class: 
+		 * 1. you could think of simply using SENF_PARSER_PRIVATE_VARIANT and List / Vectorparser like this:
+		 * SENF_PARSER_PRIVATE_VARIANT  ( fbiplist,             ip_version,
+         *                                                       (senf::VoidPacketParser) //ip_version=0
+         *                                                       (senf::VoidPacketParser) //1
+         *                                                       (senf::VoidPacketParser) //2
+         *                                                       (senf::VoidPacketParser) //3
+         *                                                       (senf::Parse_ListB< IpV4Packet, num_of_fbips>) //4 
+         *                                                       (senf::VoidPacketParser) //5
+         *                                                       (senf::Parse_ListB< IpV6Packet, num_of_fbips>) ); //6
+         * This can't work for two reasons: 
+         * 		-SENF_PARSER_PRIVATE_VARIANT only accepts 6 templates in types but you have to start from 0.
+         * 		-you NEVER can use templated Parsers in these macros since the macro-preprocessor won't recognize the <> brackets and will
+         * 			interpret the ","
+         * 
+         * The first problem is solved by using (actually inventing)  SENF_PARSER_VARIANT_TRANS which has the same limitations 
+         * 		concerning the number of types but isn't limited to the values used. This is achieved by a translating function 
+         * 		as you can see. 
+         * The second problem is solved by introducing Helper-Parser which cover both the list and the number field. By that no 
+         * 		templates have to be used. 
+		*/
+
+		struct ip_version_translator {
+		    static unsigned fromChooser(ip_version_t::value_type in) {
+			switch (in) { 
+			case 4: return 0;
+			case 6: return 1;
+			}
+		    }
+		    static ip_version_t::value_type toChooser(unsigned in) {
+			switch (in) {
+			    case 0: return 4;
+			    case 1: return 6; 
+			}
+		    }
+		};
+    
+        SENF_PARSER_VARIANT_TRANS    ( fbiplist,             ip_version, ip_version_translator,
+                                                                 (senf::DTCPIpV4AddressListParser)        //IPv4 
+                                                                 (senf::DTCPIpV6AddressListParser) );     //IPv6
+
+	SENF_PARSER_FINALIZE(Parse_DTCPPacket);
+    };
+    
+    /** \brief DTCP packet
+        
+        \par Packet type (typedef):
+            \ref DTCPPacket
+
+        \par Fields:
+            \ref Parse_DTCPPacket
+
+        \ingroup protocolbundle_mpegdvb
+     */
+    struct DTCPPacketType
+        : public PacketTypeBase,
+          public PacketTypeMixin<DTCPPacketType>
+    {
+        typedef PacketTypeMixin<DTCPPacketType> mixin;
+        typedef ConcretePacket<DTCPPacketType> packet;
+        typedef Parse_DTCPPacket parser;
+    
+        using mixin::nextPacketRange;
+        using mixin::init;
+        using mixin::initSize;
+        
+        static void dump(packet p, std::ostream & os);
+    };
+    
+    /** \brief DTCP packet typedef */
+    typedef DTCPPacketType::packet DTCPPacket;
+}
+
+#endif /*DTCPPACKET_HH_*/