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| -rw-r--r-- | src/lib/dhcp/hwaddr.h | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/src/lib/dhcp/hwaddr.h b/src/lib/dhcp/hwaddr.h new file mode 100644 index 0000000..8e98470 --- /dev/null +++ b/src/lib/dhcp/hwaddr.h @@ -0,0 +1,159 @@ +// Copyright (C) 2013-2015 Internet Systems Consortium, Inc. ("ISC") +// +// This Source Code Form is subject to the terms of the Mozilla Public +// License, v. 2.0. If a copy of the MPL was not distributed with this +// file, You can obtain one at http://mozilla.org/MPL/2.0/. + +#ifndef HWADDR_H +#define HWADDR_H + +#include <vector> +#include <stdint.h> +#include <stddef.h> +#include <dhcp/dhcp4.h> +#include <boost/shared_ptr.hpp> + +namespace isc { +namespace dhcp { + +/// @brief Hardware type that represents information from DHCPv4 packet +struct HWAddr { +public: + + /// @brief Size of an ethernet hardware address. + static const size_t ETHERNET_HWADDR_LEN = 6; + + /// @brief Maximum size of a hardware address. + static const size_t MAX_HWADDR_LEN = 20; + + /// @defgroup hw_sources Specifies where a given MAC/hardware address was + /// obtained. + /// + /// @brief The list covers all possible MAC/hw address sources. + /// + /// @{ + + /// Not really a type, only used in getMAC() calls. + static const uint32_t HWADDR_SOURCE_ANY; + + /// Used when actual origin is not known, e.g. when reading from a + /// lease database that didn't store that information. + static const uint32_t HWADDR_SOURCE_UNKNOWN; + + /// Obtained first hand from raw socket (100% reliable). + static const uint32_t HWADDR_SOURCE_RAW; + + /// Extracted from DUID-LL or DUID-LLT (not 100% reliable as the client + /// can send fake DUID). + static const uint32_t HWADDR_SOURCE_DUID; + + /// Extracted from IPv6 link-local address. Not 100% reliable, as the + /// client can use different IID other than EUI-64, e.g. Windows supports + /// RFC4941 and uses random values instead of EUI-64. + static const uint32_t HWADDR_SOURCE_IPV6_LINK_LOCAL; + + /// Get it from RFC6939 option. (A relay agent can insert client link layer + /// address option). Note that a skilled attacker can fake that by sending + /// his request relayed, so the legitimate relay will think it's a second + /// relay. + static const uint32_t HWADDR_SOURCE_CLIENT_ADDR_RELAY_OPTION; + + /// A relay can insert remote-id. In some deployments it contains a MAC + /// address (RFC4649). + static const uint32_t HWADDR_SOURCE_REMOTE_ID; + + /// A relay can insert a subscriber-id option. In some deployments it + /// contains a MAC address (RFC4580). + static const uint32_t HWADDR_SOURCE_SUBSCRIBER_ID; + + /// A CMTS (acting as DHCP relay agent) that supports DOCSIS standard + /// can insert DOCSIS options that contain client's MAC address. + /// This specific option is suboption 1026 in vendor-class option with + /// vendor-id=4491. Client in this context would be a cable modem. + static const uint32_t HWADDR_SOURCE_DOCSIS_CMTS; + + /// A cable modem (acting as DHCP client) that supports DOCSIS standard + /// can insert DOCSIS options that contain client's MAC address. + /// This specific option is suboption 36 in vendor-class option with + /// vendor-id=4491. + static const uint32_t HWADDR_SOURCE_DOCSIS_MODEM; + + /// @} + + /// @brief default constructor + HWAddr(); + + /// @brief constructor, based on C-style pointer and length + /// @param hwaddr pointer to hardware address + /// @param len length of the address pointed by hwaddr + /// @param htype hardware type + HWAddr(const uint8_t* hwaddr, size_t len, uint16_t htype); + + /// @brief constructor, based on C++ vector<uint8_t> + /// @param hwaddr const reference to hardware address + /// @param htype hardware type + HWAddr(const std::vector<uint8_t>& hwaddr, uint16_t htype); + + // Vector that keeps the actual hardware address + std::vector<uint8_t> hwaddr_; + + /// Hardware type + /// + /// @note It used to be uint8_t as used in DHCPv4. However, since we're + /// expanding MAC addresses support to DHCPv6 that uses hw_type as + /// 16 bits, we need to be able to store that wider format. + uint16_t htype_; + + /// @brief Hardware address source + /// + /// This variable specifies how the hardware address was obtained. + /// @todo This is a stub implementation. Proper implementation will move + /// constants from Pkt::HWADDR_SOURCE_* here. Currently always initialized + /// to zero. + uint32_t source_; + + /// @brief Returns textual representation of a hardware address + /// (e.g. 00:01:02:03:04:05) + /// + /// @param include_htype Boolean value which controls whether the hardware + /// type is included in the returned string (true), or not (false). + /// + /// @return Hardware address in the textual format. + std::string toText(bool include_htype = true) const; + + /// @brief Creates instance of the hardware address from textual format. + /// + /// This function parses HW address specified as text and creates the + /// corresponding @c HWAddr instance. The hexadecimal digits representing + /// individual bytes of the hardware address should be separated with + /// colons. Typically, two digits per byte are used. However, this function + /// allows for 1 digit per HW address byte. In this case, the digit is + /// prepended with '0' during conversion to binary value. + /// + /// This function can be used to perform a reverse operation to the + /// @c HWAddr::toText(false). + /// + /// The instance created by this function sets HTYPE_ETHER as a hardware + /// type. + /// + /// @param text HW address in the textual format. + /// @param htype Hardware type. + /// + /// @return Instance of the HW address created from text. + static HWAddr fromText(const std::string& text, + const uint16_t htype = HTYPE_ETHER); + + /// @brief Compares two hardware addresses for equality + bool operator==(const HWAddr& other) const; + + /// @brief Compares two hardware addresses for inequality + bool operator!=(const HWAddr& other) const; +}; + +/// @brief Shared pointer to a hardware address structure +typedef boost::shared_ptr<HWAddr> HWAddrPtr; + +}; // end of isc::dhcp namespace +}; // end of isc namespace + +#endif // HWADDR_H |