/*************************************************************************** * 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) 1996-2011 Insecure.Com LLC. Nmap is * * also a registered trademark of Insecure.Com LLC. 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 with the clarifications and exceptions described * * below. 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@insecure.com). Dozens of software vendors already * * license Nmap technology such as host discovery, port scanning, OS * * detection, and version detection. * * * * Note that the GPL places important restrictions on "derived works", yet * * it does not provide a detailed definition of that term. To avoid * * misunderstandings, we consider an application to constitute a * * "derivative work" for the purpose of this license if it does any of the * * following: * * o Integrates source code from Nmap * * o Reads or includes Nmap copyrighted data files, such as * * nmap-os-db or nmap-service-probes. * * o Executes Nmap and parses the results (as opposed to typical shell or * * execution-menu apps, which simply display raw Nmap output and so are * * not derivative works.) * * o Integrates/includes/aggregates Nmap into a proprietary executable * * installer, such as those produced by InstallShield. * * o Links to a library or executes a program that does any of the above * * * * The term "Nmap" should be taken to also include any portions or derived * * works of Nmap. This list is not exclusive, but is meant to clarify our * * interpretation of derived works with some common examples. 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See the GNU * * General Public License v2.0 for more details at * * http://www.gnu.org/licenses/gpl-2.0.html , or in the COPYING file * * included with Nmap. * * * ***************************************************************************/ #include "EthernetHeader.h" #include "nping.h" #include "common.h" #include "utils_net.h" EthernetHeader::EthernetHeader(){ this->reset(); } /* End of EthernetHeader constructor */ EthernetHeader::~EthernetHeader(){ } /* End of EthernetHeader destructor */ /** Sets every class attribute to zero */ void EthernetHeader::reset(){ memset(&this->h, 0, sizeof(nping_eth_hdr_t)); memset(&this->f, 0, ETH_FOOTER_LEN ); this->length=14; /* We don't count the crc yet */ } /* 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() */ /** 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() */ /** Sets Source MAC address * @warning Supplied buffer must contain at least 6 bytes */ int EthernetHeader::setSrcMAC(const u8 *m){ if(m==NULL) outFatal(QT_3, "EthernetHeader::setSrcMAC(u8*): NULL value supplied "); memcpy(h.eth_smac, m, 6); return OP_SUCCESS; } /* End of setSrcMAC() */ /** Sets Source MAC address. If it receives "rand", a random MAC is set. * @warning Supplied buffer must have format "FF:FF:FF:FF:FF:FF" */ int EthernetHeader::setSrcMAC_str(char *p){ u8 dummy[6]; if(p==NULL) outFatal(QT_3, "EthernetHeader::setSrcMAC(char *): NULL value supplied "); if( parseMAC(p, dummy) != OP_SUCCESS ) return OP_FAILURE; memcpy(h.eth_smac, dummy, 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. */ u8* EthernetHeader::getSrcMAC(){ 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) outFatal(QT_3, "EthernetHeader::setDstMAC(u8 *): NULL value supplied "); memcpy(h.eth_dmac, m, 6); return OP_SUCCESS; } /* End of setDstMAC() */ /** Sets destination port. If it receives "rand", a random destination port is set. * @warning MAC must be supplied in host byte order. This method performs * byte order conversion using htons() */ int EthernetHeader::setDstMAC(char *p){ u8 dummy[6]; if(p==NULL) outFatal(QT_3, "EthernetHeader::setDstMAC(char *): NULL value supplied "); if( parseMAC(p, dummy) != OP_SUCCESS ) return OP_FAILURE; memcpy(h.eth_dmac, dummy, 6); return OP_SUCCESS; } /* End of setDstMAC() */ /** Returns destination port in HOST byte order */ u8 *EthernetHeader::getDstMAC(){ 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 */ u16 EthernetHeader::getEtherType(){ return this->h.eth_type; } /* End of getEtherType() */ /** @warning Sum is set to supplied value with NO byte ordering conversion * performed. */ int EthernetHeader::setSum(u32 s){ this->f.crc=s; return OP_SUCCESS; } /* End of setSum() */ /* TODO: Finish implementation */ int EthernetHeader::setSum(){ f.crc = 0; //int bufflen; //u8 aux[ MAX_IP_PACKET_LEN + 14 + 4 ]; /* Copy packet contents to a buffer */ //bufflen=this->dumpToBinaryBuffer(aux, MAX_IP_PACKET_LEN + 14 + 4); /* Compute checksum */ // f.crc = crc32... return OP_SUCCESS; } /* End of setSum() */ int EthernetHeader::setSumRandom(){ while( (this->f.crc=get_random_u32())==0 ); /* Discard value zero */ return OP_SUCCESS; } /* End of setSumRandom() */ u32 EthernetHeader::getSum(){ return this->f.crc; } /* End of getSum() */