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/***************************************************************************
* 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) 1996-2022 Nmap Software LLC ("The Nmap *
* Project"). Nmap is also a registered trademark of the Nmap Project. *
* *
* This program is distributed under the terms of the Nmap Public Source *
* License (NPSL). The exact license text applying to a particular Nmap *
* release or source code control revision is contained in the LICENSE *
* file distributed with that version of Nmap or source code control *
* revision. More Nmap copyright/legal information is available from *
* https://nmap.org/book/man-legal.html, and further information on the *
* NPSL license itself can be found at https://nmap.org/npsl/ . This *
* header summarizes some key points from the Nmap license, but is no *
* substitute for the actual license text. *
* *
* Nmap is generally free for end users to download and use themselves, *
* including commercial use. It is available from https://nmap.org. *
* *
* The Nmap license generally prohibits companies from using and *
* redistributing Nmap in commercial products, but we sell a special Nmap *
* OEM Edition with a more permissive license and special features for *
* this purpose. See https://nmap.org/oem/ *
* *
* If you have received a written Nmap license agreement or contract *
* stating terms other than these (such as an Nmap OEM license), you may *
* choose to use and redistribute Nmap under those terms instead. *
* *
* The official Nmap Windows builds include the Npcap software *
* (https://npcap.com) for packet capture and transmission. It is under *
* separate license terms which forbid redistribution without special *
* permission. So the official Nmap Windows builds may not be *
* redistributed without special permission (such as an Nmap OEM *
* license). *
* *
* 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 submit your *
* changes as a Github PR or by email to the dev@nmap.org mailing list *
* for possible incorporation into the main distribution. Unless you *
* specify otherwise, it is understood that you are offering us very *
* broad rights to use your submissions as described in the Nmap Public *
* Source License Contributor Agreement. This is important because we *
* fund the project by selling licenses with various terms, and also *
* because the inability to relicense code has caused devastating *
* problems for other Free Software projects (such as KDE and NASM). *
* *
* The free version of Nmap 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. Warranties, *
* indemnification and commercial support are all available through the *
* Npcap OEM program--see https://nmap.org/oem/ *
* *
***************************************************************************/
/* 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 || len<ETH_HEADER_LEN){
return OP_FAILURE;
}else{
this->reset(); /* 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 */
u16 EthernetHeader::getEtherType() const {
return ntohs(this->h.eth_type);
} /* End of getEtherType() */
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