/*************************************************************************** * EthernetHeader.cc -- The EthernetHeader Class represents an Ethernet * * header and footer. It contains methods to set the different header * * fields. These methods tipically perform the necessary error checks and * * byte order conversions. * * * ***********************IMPORTANT NMAP LICENSE TERMS************************ * * * The Nmap Security Scanner is (C) 1996-2016 Insecure.Com LLC ("The Nmap * * Project"). Nmap is also a registered trademark of the Nmap Project. * * This program is free software; you may redistribute and/or modify it * * under the terms of the GNU General Public License as published by the * * Free Software Foundation; Version 2 ("GPL"), BUT ONLY WITH ALL OF THE * * CLARIFICATIONS AND EXCEPTIONS DESCRIBED HEREIN. This guarantees your * * right to use, modify, and redistribute this software under certain * * conditions. If you wish to embed Nmap technology into proprietary * * software, we sell alternative licenses (contact sales@nmap.com). * * Dozens of software vendors already license Nmap technology such as * * host discovery, port scanning, OS detection, version detection, and * * the Nmap Scripting Engine. * * * * Note that the GPL places important restrictions on "derivative works", * * yet it does not provide a detailed definition of that term. To avoid * * misunderstandings, we interpret that term as broadly as copyright law * * allows. For example, we consider an application to constitute a * * derivative work for the purpose of this license if it does any of the * * following with any software or content covered by this license * * ("Covered Software"): * * * * o Integrates source code from Covered Software. * * * * o Reads or includes copyrighted data files, such as Nmap's nmap-os-db * * or nmap-service-probes. * * * * o Is designed specifically to execute Covered Software and parse the * * results (as opposed to typical shell or execution-menu apps, which will * * execute anything you tell them to). * * * * o Includes Covered Software in a proprietary executable installer. The * * installers produced by InstallShield are an example of this. Including * * Nmap with other software in compressed or archival form does not * * trigger this provision, provided appropriate open source decompression * * or de-archiving software is widely available for no charge. For the * * purposes of this license, an installer is considered to include Covered * * Software even if it actually retrieves a copy of Covered Software from * * another source during runtime (such as by downloading it from the * * Internet). * * * * o Links (statically or dynamically) to a library which does any of the * * above. * * * * o Executes a helper program, module, or script to do any of the above. * * * * This list is not exclusive, but is meant to clarify our interpretation * * of derived works with some common examples. Other people may interpret * * the plain GPL differently, so we consider this a special exception to * * the GPL that we apply to Covered Software. Works which meet any of * * these conditions must conform to all of the terms of this license, * * particularly including the GPL Section 3 requirements of providing * * source code and allowing free redistribution of the work as a whole. * * * * As another special exception to the GPL terms, the Nmap Project grants * * permission to link the code of this program with any version of the * * OpenSSL library which is distributed under a license identical to that * * listed in the included docs/licenses/OpenSSL.txt file, and distribute * * linked combinations including the two. * * * * The Nmap Project has permission to redistribute Npcap, a packet * * capturing driver and library for the Microsoft Windows platform. * * Npcap is a separate work with it's own license rather than this Nmap * * license. Since the Npcap license does not permit redistribution * * without special permission, our Nmap Windows binary packages which * * contain Npcap may not be redistributed without special permission. * * * * Any redistribution of Covered Software, including any derived works, * * must obey and carry forward all of the terms of this license, including * * obeying all GPL rules and restrictions. For example, source code of * * the whole work must be provided and free redistribution must be * * allowed. All GPL references to "this License", are to be treated as * * including the terms and conditions of this license text as well. * * * * Because this license imposes special exceptions to the GPL, Covered * * Work may not be combined (even as part of a larger work) with plain GPL * * software. The terms, conditions, and exceptions of this license must * * be included as well. This license is incompatible with some other open * * source licenses as well. In some cases we can relicense portions of * * Nmap or grant special permissions to use it in other open source * * software. Please contact fyodor@nmap.org with any such requests. * * Similarly, we don't incorporate incompatible open source software into * * Covered Software without special permission from the copyright holders. * * * * If you have any questions about the licensing restrictions on using * * Nmap in other works, are happy to help. As mentioned above, we also * * offer alternative license to integrate Nmap into proprietary * * applications and appliances. These contracts have been sold to dozens * * of software vendors, and generally include a perpetual license as well * * as providing for priority support and updates. They also fund the * * continued development of Nmap. Please email sales@nmap.com for further * * information. * * * * If you have received a written license agreement or contract for * * Covered Software stating terms other than these, you may choose to use * * and redistribute Covered Software under those terms instead of these. * * * * Source is provided to this software because we believe users have a * * right to know exactly what a program is going to do before they run it. * * This also allows you to audit the software for security holes. * * * * Source code also allows you to port Nmap to new platforms, fix bugs, * * and add new features. You are highly encouraged to send your changes * * to the dev@nmap.org mailing list for possible incorporation into the * * main distribution. By sending these changes to Fyodor or one of the * * Insecure.Org development mailing lists, or checking them into the Nmap * * source code repository, it is understood (unless you specify * * otherwise) that you are offering the Nmap Project the unlimited, * * non-exclusive right to reuse, modify, and relicense the code. Nmap * * will always be available Open Source, but this is important because * * the inability to relicense code has caused devastating problems for * * other Free Software projects (such as KDE and NASM). We also * * occasionally relicense the code to third parties as discussed above. * * If you wish to specify special license conditions of your * * contributions, just say so when you send them. * * * * This program 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 Nmap * * license file for more details (it's in a COPYING file included with * * Nmap, and also available from https://svn.nmap.org/nmap/COPYING) * * * ***************************************************************************/ /* This code was originally part of the Nping tool. */ #include "EthernetHeader.h" /******************************************************************************/ /* CONTRUCTORS, DESTRUCTORS AND INITIALIZATION METHODS */ /******************************************************************************/ EthernetHeader::EthernetHeader(){ this->reset(); } /* End of EthernetHeader constructor */ EthernetHeader::~EthernetHeader(){ } /* End of EthernetHeader destructor */ /** Sets every attribute to its default value */ void EthernetHeader::reset(){ memset(&this->h, 0, sizeof(nping_eth_hdr_t)); this->length=ETH_HEADER_LEN; } /* End of reset() */ /** @warning This method is essential for the superclass getBinaryBuffer() * method to work. Do NOT change a thing unless you know what you're doing */ u8 * EthernetHeader::getBufferPointer(){ return (u8*)(&h); } /* End of getBufferPointer() */ /******************************************************************************/ /* PacketElement:: OVERWRITTEN METHODS */ /******************************************************************************/ /** Stores supplied packet in the internal buffer so the information * can be accessed using the standard get & set methods. * @warning The EthernetHeader class is able to hold a maximum of 14 bytes. * If the supplied buffer is longer than that, only the first 14 bytes will be * stored in the internal buffer. * @warning Supplied len MUST be at least 14 bytes (Ethernet header length). * @return OP_SUCCESS on success and OP_FAILURE in case of error */ int EthernetHeader::storeRecvData(const u8 *buf, size_t len){ if(buf==NULL || lenreset(); /* Re-init the object, just in case the caller had used it already */ this->length=ETH_HEADER_LEN; memcpy(&(this->h), buf, ETH_HEADER_LEN); } return OP_SUCCESS; } /* End of storeRecvData() */ /* Returns a protocol identifier. This is used by packet parsing funtions * that return linked lists of PacketElement objects, to determine the protocol * the object represents. */ int EthernetHeader::protocol_id() const { return HEADER_TYPE_ETHERNET; } /* End of protocol_id() */ /** Determines if the data stored in the object after an storeRecvData() call * is valid and safe to use. This mainly checks the length of the data but may * also test the value of certain protocol fields to ensure their correctness. * @return the length, in bytes, of the header, if its found to be valid or * OP_FAILURE (-1) otherwise. */ int EthernetHeader::validate(){ if( this->length!=ETH_HEADER_LEN) return OP_FAILURE; else return ETH_HEADER_LEN; } /* End of validate() */ /** Prints the contents of the header and calls print() on the next protocol * header in the chain (if there is any). * @return OP_SUCCESS on success and OP_FAILURE in case of error. */ int EthernetHeader::print(FILE *output, int detail) const { fprintf(output, "Eth["); for(int i=0; i<6; i++){ fprintf(output, "%02x", this->h.eth_smac[i]); if(i<5) fprintf(output, ":"); } fprintf(output, " > "); for(int i=0; i<6; i++){ fprintf(output, "%02x", this->h.eth_dmac[i]); if(i<5) fprintf(output, ":"); } if(detail>=PRINT_DETAIL_MED) fprintf(output, " Type=%04x", this->getEtherType()); fprintf(output, "]"); if(this->next!=NULL){ print_separator(output, detail); next->print(output, detail); } return OP_SUCCESS; } /* End of print() */ /******************************************************************************/ /* PROTOCOL-SPECIFIC METHODS */ /******************************************************************************/ /** Sets Source MAC address * @warning Supplied buffer must contain at least 6 bytes */ int EthernetHeader::setSrcMAC(const u8 *m){ if(m==NULL) netutil_fatal("EthernetHeader::setSrcMAC(u8*): NULL value supplied "); memcpy(h.eth_smac, m, 6); return OP_SUCCESS; } /* End of setSrcMAC() */ /** Returns source port in HOST byte order * @warning Returned pointer points directly to a Class internal buffer. If * contents are changed, the instance of the class will be affected. */ const u8* EthernetHeader::getSrcMAC() const { return this->h.eth_smac; } /* End of getSrcMAC() */ /** Sets Destination MAC address * @warning Supplied buffer must contain at least 6 bytes */ int EthernetHeader::setDstMAC(u8 *m){ if(m==NULL) netutil_fatal("EthernetHeader::setDstMAC(u8 *): NULL value supplied "); memcpy(h.eth_dmac, m, 6); return OP_SUCCESS; } /* End of setDstMAC() */ /** Returns destination port in HOST byte order */ const u8 *EthernetHeader::getDstMAC() const { return this->h.eth_dmac; } /* End of getDstMAC() */ int EthernetHeader::setEtherType(u16 val){ h.eth_type=htons(val); return OP_SUCCESS; } /* End of setEtherType() */ /** Returns destination port in HOST byte order */ const u16 EthernetHeader::getEtherType() const { return ntohs(this->h.eth_type); } /* End of getEtherType() */