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317 lines
12 KiB
C++
317 lines
12 KiB
C++
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/***************************************************************************
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* ARPHeader.cc -- The ARPHeader Class represents an ARP packet. It *
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* contains methods to set any header field. In general, these methods do *
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* error checkings and byte order conversion. *
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* *
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***********************IMPORTANT NMAP LICENSE TERMS************************
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* *
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* The Nmap Security Scanner is (C) 1996-2020 Insecure.Com LLC ("The Nmap *
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* Project"). Nmap is also a registered trademark of the Nmap Project. *
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* *
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* This program is distributed under the terms of the Nmap Public Source *
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* License (NPSL). The exact license text applying to a particular Nmap *
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* release or source code control revision is contained in the LICENSE *
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* file distributed with that version of Nmap or source code control *
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* revision. More Nmap copyright/legal information is available from *
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* https://nmap.org/book/man-legal.html, and further information on the *
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* NPSL license itself can be found at https://nmap.org/npsl. This header *
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* summarizes some key points from the Nmap license, but is no substitute *
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* for the actual license text. *
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* *
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* Nmap is generally free for end users to download and use themselves, *
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* including commercial use. It is available from https://nmap.org. *
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* *
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* The Nmap license generally prohibits companies from using and *
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* redistributing Nmap in commercial products, but we sell a special Nmap *
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* OEM Edition with a more permissive license and special features for *
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* this purpose. See https://nmap.org/oem *
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* *
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* If you have received a written Nmap license agreement or contract *
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* stating terms other than these (such as an Nmap OEM license), you may *
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* choose to use and redistribute Nmap under those terms instead. *
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* *
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* The official Nmap Windows builds include the Npcap software *
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* (https://npcap.org) for packet capture and transmission. It is under *
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* separate license terms which forbid redistribution without special *
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* permission. So the official Nmap Windows builds may not be *
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* redistributed without special permission (such as an Nmap OEM *
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* license). *
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* *
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* Source is provided to this software because we believe users have a *
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* right to know exactly what a program is going to do before they run it. *
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* This also allows you to audit the software for security holes. *
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* *
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* Source code also allows you to port Nmap to new platforms, fix bugs, *
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* and add new features. You are highly encouraged to submit your *
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* changes as a Github PR or by email to the dev@nmap.org mailing list *
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* for possible incorporation into the main distribution. Unless you *
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* specify otherwise, it is understood that you are offering us very *
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* broad rights to use your submissions as described in the Nmap Public *
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* Source License Contributor Agreement. This is important because we *
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* fund the project by selling licenses with various terms, and also *
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* because the inability to relicense code has caused devastating *
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* problems for other Free Software projects (such as KDE and NASM). *
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* *
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* The free version of Nmap is distributed in the hope that it will be *
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* useful, but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. Warranties, *
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* indemnification and commercial support are all available through the *
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* Npcap OEM program--see https://nmap.org/oem. *
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* *
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***************************************************************************/
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/* This code was originally part of the Nping tool. */
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#include "ARPHeader.h"
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/******************************************************************************/
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/* CONTRUCTORS, DESTRUCTORS AND INITIALIZATION METHODS */
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/******************************************************************************/
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ARPHeader::ARPHeader() {
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this->reset();
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} /* End of ARPHeader constructor */
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ARPHeader::~ARPHeader() {
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} /* End of ARPHeader destructor */
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/** Sets every attribute to its default value */
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void ARPHeader::reset(){
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memset (&this->h, 0, sizeof(nping_arp_hdr_t));
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this->length=ARP_HEADER_LEN;
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} /* End of reset() */
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/******************************************************************************/
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/* PacketElement:: OVERWRITTEN METHODS */
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/******************************************************************************/
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/** @warning This method is essential for the superclass getBinaryBuffer()
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* method to work. Do NOT change a thing unless you know what you're doing */
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u8 *ARPHeader::getBufferPointer(){
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return (u8*)(&h);
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} /* End of getBufferPointer() */
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/** Stores supplied packet in the internal buffer so the information
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* can be accessed using the standard get & set methods.
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* @warning The ARPHeader class is able to hold a maximum of 28 bytes.
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* If the supplied buffer is longer than that, only the first 28 bytes will be
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* stored in the internal buffer.
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* @warning Supplied len MUST be at least 28 bytes (ARP header length).
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* @return OP_SUCCESS on success and OP_FAILURE in case of error */
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int ARPHeader::storeRecvData(const u8 *buf, size_t len){
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if(buf==NULL || len<ARP_HEADER_LEN){
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return OP_FAILURE;
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}else{
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this->reset(); /* Re-init the object, just in case the caller had used it already */
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this->length=ARP_HEADER_LEN;
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memcpy(&(this->h), buf, ARP_HEADER_LEN);
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}
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return OP_SUCCESS;
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} /* End of storeRecvData() */
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/* Returns a protocol identifier. This is used by packet parsing funtions
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* that return linked lists of PacketElement objects, to determine the protocol
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* the object represents. */
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int ARPHeader::protocol_id() const {
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return HEADER_TYPE_ARP;
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} /* End of protocol_id() */
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/** Determines if the data stored in the object after an storeRecvData() call
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* is valid and safe to use. This mainly checks the length of the data but may
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* also test the value of certain protocol fields to ensure their correctness.
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* @return the length, in bytes, of the header, if its found to be valid or
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* OP_FAILURE (-1) otherwise. */
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int ARPHeader::validate(){
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if( this->length!=ARP_HEADER_LEN)
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return OP_FAILURE;
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else
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return ARP_HEADER_LEN;
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} /* End of validate() */
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/** Prints the contents of the header and calls print() on the next protocol
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* header in the chain (if there is any).
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* @return OP_SUCCESS on success and OP_FAILURE in case of error. */
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int ARPHeader::print(FILE *output, int detail) const {
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fprintf(output, "ARP[]");
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if(this->next!=NULL){
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print_separator(output, detail);
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next->print(output, detail);
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}
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return OP_SUCCESS;
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} /* End of print() */
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/******************************************************************************/
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/* PROTOCOL-SPECIFIC METHODS */
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/******************************************************************************/
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/** Sets HardwareType.
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* @return OP_SUCCESS on success and OP_FAILURE in case of error. */
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int ARPHeader::setHardwareType(u16 val){
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this->h.ar_hrd=htons(val);
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return OP_SUCCESS;
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} /* End of setHardwareType() */
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/** Sets HardwareType to ETHERNET.
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* @return OP_SUCCESS on success and OP_FAILURE in case of error. */
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int ARPHeader::setHardwareType(){
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this->h.ar_hrd=htons(HDR_ETH10MB);
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return OP_SUCCESS;
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} /* End of setHardwareType() */
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/** Returns value of attribute h.ar_hrd */
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u16 ARPHeader::getHardwareType(){
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return ntohs(this->h.ar_hrd);
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} /* End of getHardwareType() */
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/** Sets ProtocolType.
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* @return OP_SUCCESS on success and OP_FAILURE in case of error. */
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int ARPHeader::setProtocolType(u16 val){
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this->h.ar_pro=htons(val);
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return OP_SUCCESS;
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} /* End of setProtocolType() */
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/** Sets ProtocolType.
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* @return OP_SUCCESS on success and OP_FAILURE in case of error. */
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int ARPHeader::setProtocolType(){
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this->h.ar_pro=htons(0x0800); /* DEFAULT: IPv4 */
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return OP_SUCCESS;
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} /* End of setProtocolType() */
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/** Returns value of attribute h.ar_pro */
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u16 ARPHeader::getProtocolType(){
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return ntohs(this->h.ar_pro);
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} /* End of getProtocolType() */
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/** Sets HwAddrLen.
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* @return OP_SUCCESS on success and OP_FAILURE in case of error. */
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int ARPHeader::setHwAddrLen(u8 val){
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this->h.ar_hln=val;
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return OP_SUCCESS;
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} /* End of setHwAddrLen() */
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/** Sets HwAddrLen.
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* @return OP_SUCCESS on success and OP_FAILURE in case of error. */
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int ARPHeader::setHwAddrLen(){
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this->h.ar_hln=ETH_ADDRESS_LEN;
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return OP_SUCCESS;
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} /* End of setHwAddrLen() */
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/** Returns value of attribute h.ar_hln */
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u8 ARPHeader::getHwAddrLen(){
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return this->h.ar_hln;
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} /* End of getHwAddrLen() */
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/** Sets ProtoAddrLen.
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* @return OP_SUCCESS on success and OP_FAILURE in case of error. */
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int ARPHeader::setProtoAddrLen(u8 val){
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this->h.ar_pln=val;
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return OP_SUCCESS;
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} /* End of setProtoAddrLen() */
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/** Sets ProtoAddrLen.
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* @return OP_SUCCESS on success and OP_FAILURE in case of error. */
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int ARPHeader::setProtoAddrLen(){
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this->h.ar_pln=IPv4_ADDRESS_LEN; /* DEFAULT: IPv4 */
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return OP_SUCCESS;
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} /* End of setProtoAddrLen() */
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/** Returns value of attribute h.ar_pln */
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u8 ARPHeader::getProtoAddrLen(){
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return this->h.ar_pln;
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} /* End of getProtoAddrLen() */
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/** Sets OpCode.
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* @return OP_SUCCESS on success and OP_FAILURE in case of error. */
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int ARPHeader::setOpCode(u16 val){
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this->h.ar_op=htons(val);
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return OP_SUCCESS;
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} /* End of setOpCode() */
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/** Returns value of attribute h.ar_op */
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u16 ARPHeader::getOpCode(){
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return ntohs(this->h.ar_op);
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} /* End of getOpCode() */
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/** Sets SenderMAC.
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* @return OP_SUCCESS on success and OP_FAILURE in case of error. */
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int ARPHeader::setSenderMAC(const u8 * val){
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if(val==NULL)
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return OP_FAILURE;
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memcpy(this->h.data, val, ETH_ADDRESS_LEN);
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return OP_SUCCESS;
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} /* End of setSenderMAC() */
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/** Returns value of attribute h.ar_sha */
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u8 * ARPHeader::getSenderMAC(){
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return this->h.data;
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} /* End of getSenderMAC() */
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/** Sets SenderIP.
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* @return OP_SUCCESS on success and OP_FAILURE in case of error. */
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int ARPHeader::setSenderIP(struct in_addr val){
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memcpy(this->h.data+6, &val.s_addr, 4);
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return OP_SUCCESS;
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} /* End of setSenderIP() */
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/** Returns value of attribute h.ar_sip */
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u32 ARPHeader::getSenderIP(){
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u32 *p = (u32 *)(this->h.data+6);
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return *p;
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} /* End of getSenderIP() */
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/** Sets TargetMAC.
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* @return OP_SUCCESS on success and OP_FAILURE in case of error. */
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int ARPHeader::setTargetMAC(u8 * val){
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if(val==NULL)
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return OP_FAILURE;
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memcpy(this->h.data+10, val, ETH_ADDRESS_LEN);
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return OP_SUCCESS;
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} /* End of setTargetMAC() */
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/** Returns value of attribute h.ar_tha */
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u8 * ARPHeader::getTargetMAC(){
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return this->h.data+10;
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} /* End of getTargetMAC() */
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/** Sets TargetIP.
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* @return OP_SUCCESS on success and OP_FAILURE in case of error. */
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int ARPHeader::setTargetIP(struct in_addr val){
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memcpy(this->h.data+16, &val.s_addr, 4);
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return OP_SUCCESS;
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} /* End of setTargetIP() */
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/** Returns value of attribute h.ar_tip */
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u32 ARPHeader::getTargetIP(){
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u32 *p = (u32 *)(this->h.data+16);
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return *p;
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} /* End of getTargetIP() */
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