perf_pkt4.h 6.17 KB
 Marcin Siodelski committed Jun 05, 2012 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 // Copyright (C) 2011 Internet Systems Consortium, Inc. ("ISC") // // Permission to use, copy, modify, and/or distribute this software for any // purpose with or without fee is hereby granted, provided that the above // copyright notice and this permission notice appear in all copies. // // THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH // REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY // AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, // INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM // LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE // OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR // PERFORMANCE OF THIS SOFTWARE. #ifndef __PERF_PKT4_H #define __PERF_PKT4_H #include #include #include #include "localized_option.h" namespace isc { namespace perfdhcp { /// \brief PerfPkt4 (DHCPv4 packet) /// /// This class extends functionality of \ref isc::dhcp::Pkt4 by /// adding ability to specify options offset in DHCP message /// and override options' contents with new option. /// This approach is useful when we create paket object from /// raw template buffer from file and we want to use it as /// a base to create test packets to be sent to DHCP server. /// /// Some of the contents of such a template packets always /// have to be replaced e.g. transaction id, IA_NA. Other /// contents (options) may be changed e.g. elapsed time, /// server id. /// /// In order to create packet from raw template buffer /// we have to pass this buffer along with transaction id /// offset. Class will read transaction id from the buffer. /// Next, in order to replace contents of selected options /// in a template packet, we need to add these selected options /// to packet object using addOption() method. Please note /// that options must be of the /// \ref isc::perfdhcp::LocalizedOption type. /// /// \note: if you don't use template files simply use constructors /// inherited from parent class and isc::dhcp::Option type instead /// class PerfPkt4 : public dhcp::Pkt4 { public: /// Localized option pointer type. typedef boost::shared_ptr LocalizedOptionPtr;  Marcin Siodelski committed Jun 05, 2012 59 60 61 62 63 64 65 66 67 68  /// \brief Constructor, used for outgoing and incoming messages /// /// This constructor initializes transaction id and /// transaction id offset of the packet with default /// values. /// /// \param buf buffer holding contents of the message. /// \param len length of the data in the buffer. PerfPkt4(const uint8_t* buf, size_t len);  Marcin Siodelski committed Jun 05, 2012 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85  /// \brief Constructor, used for outgoing DHCP messages. /// /// Creates new DHCPv4 message using provided buffer. /// Transaction id and its offset are specified through this /// constructor so as they are stored in outgoing message /// when client class calls \ref PerfPkt4::rawPack. /// /// \note This constructor should be used only for outgoing /// messages that are created from raw buffer (e.g. read from /// template files). /// /// \param buf buffer holiding contents of the message (this can /// be directly read from template file). /// \param len length of the data in the buffer. /// \param transid_offset transaction id offset in outgoing message. /// \param transid transaction id to be stored in outgoing message. PerfPkt4(const uint8_t* buf,  Marcin Siodelski committed Jun 05, 2012 86  size_t len,  Marcin Siodelski committed Jun 05, 2012 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112  size_t transid_offset, uint32_t transid); /// Constructor, used for incoming DHCP messages. /// /// Creates new DHCPv6 message using provided buffer. New object /// will keep copy of contents of provided buffer. If buffer contains /// options at custom offsets (e.g. if packet was read from /// template file) additional information about options' /// offsets has to be provided - see /// \ref isc::perfdhcp::LocalizedOption for details. /// /// Transaction id offset point to location of raw data where /// transaction id field is stored. The transaction id will /// be read from this location when PerfPkt4::rawUnpack is /// called. The transid_ class member will be updated accordingly. /// /// \note use this constructor only in case you want to create /// incoming DHCPv6 object from the raw buffer /// and you know options offsets. Options offsets are /// specified from perfdhcp command line by the user. /// /// \param buf pointer to a buffer of received packet content. /// \param len size of buffer of packet content. /// \param transid_offset transaction id offset in a message. PerfPkt4(const uint8_t* buf,  Marcin Siodelski committed Jun 05, 2012 113  size_t len,  Marcin Siodelski committed Jun 05, 2012 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159  size_t transid_offset); /// \brief Returns transaction id offset in packet buffer /// /// return transaction id offset in packet buffer size_t getTransIdOffset() const { return transid_offset_; }; /// \brief Prepares on-wire format from raw buffer /// /// The method copies user buffer to output buffer and /// extracts transaction id from it based on transaction id /// offset provided in constructor. /// /// \note: Use this method to prepare on-wire DHCPv6 message /// when you use template packets that require replacement /// of selected options' contents before sending. /// /// \retrun false, id pack operation failed. bool rawPack(); /// \brief Handles limited binary packet parsing for packets with /// custom offsets of options and transaction id /// /// Function handles reception of packets that have non-default values /// of options or transaction id offsets. Use /// \ref isc::dhcp::Pkt4::addOption to specify which options to parse. /// Each option should be of the: isc::perfdhcp::LocalizedOption /// type with offset value indicated. /// /// \return false, if unpack operation failed. bool rawUnpack(); /// \brief Update packet timestamp with current time /// /// \throw isc::Unexpected if timestamp update failed void updateTimestamp(); private: size_t transid_offset_; ///< transaction id offset }; } // namespace perfdhcp } // namespace isc #endif // __PERF_PKT4_H