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/***************************************************************************
* ARPHeader.cc -- The ARPHeader Class represents an ARP packet. It *
* contains methods to set any header field. In general, these methods do *
* error checkings and byte order conversion. *
* *
***********************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 "ARPHeader.h"
/******************************************************************************/
/* CONTRUCTORS, DESTRUCTORS AND INITIALIZATION METHODS */
/******************************************************************************/
ARPHeader::ARPHeader() {
this->reset();
} /* End of ARPHeader constructor */
ARPHeader::~ARPHeader() {
} /* End of ARPHeader destructor */
/** Sets every attribute to its default value */
void ARPHeader::reset(){
memset (&this->h, 0, sizeof(nping_arp_hdr_t));
this->length=ARP_HEADER_LEN;
} /* End of reset() */
/******************************************************************************/
/* PacketElement:: OVERWRITTEN METHODS */
/******************************************************************************/
/** @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 *ARPHeader::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 ARPHeader class is able to hold a maximum of 28 bytes.
* If the supplied buffer is longer than that, only the first 28 bytes will be
* stored in the internal buffer.
* @warning Supplied len MUST be at least 28 bytes (ARP header length).
* @return OP_SUCCESS on success and OP_FAILURE in case of error */
int ARPHeader::storeRecvData(const u8 *buf, size_t len){
if(buf==NULL || len<ARP_HEADER_LEN){
return OP_FAILURE;
}else{
this->reset(); /* Re-init the object, just in case the caller had used it already */
this->length=ARP_HEADER_LEN;
memcpy(&(this->h), buf, ARP_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 ARPHeader::protocol_id() const {
return HEADER_TYPE_ARP;
} /* 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 ARPHeader::validate(){
if( this->length!=ARP_HEADER_LEN)
return OP_FAILURE;
else
return ARP_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 ARPHeader::print(FILE *output, int detail) const {
fprintf(output, "ARP[]");
if(this->next!=NULL){
print_separator(output, detail);
next->print(output, detail);
}
return OP_SUCCESS;
} /* End of print() */
/******************************************************************************/
/* PROTOCOL-SPECIFIC METHODS */
/******************************************************************************/
/** Sets HardwareType.
* @return OP_SUCCESS on success and OP_FAILURE in case of error. */
int ARPHeader::setHardwareType(u16 val){
this->h.ar_hrd=htons(val);
return OP_SUCCESS;
} /* End of setHardwareType() */
/** Sets HardwareType to ETHERNET.
* @return OP_SUCCESS on success and OP_FAILURE in case of error. */
int ARPHeader::setHardwareType(){
this->h.ar_hrd=htons(HDR_ETH10MB);
return OP_SUCCESS;
} /* End of setHardwareType() */
/** Returns value of attribute h.ar_hrd */
u16 ARPHeader::getHardwareType(){
return ntohs(this->h.ar_hrd);
} /* End of getHardwareType() */
/** Sets ProtocolType.
* @return OP_SUCCESS on success and OP_FAILURE in case of error. */
int ARPHeader::setProtocolType(u16 val){
this->h.ar_pro=htons(val);
return OP_SUCCESS;
} /* End of setProtocolType() */
/** Sets ProtocolType.
* @return OP_SUCCESS on success and OP_FAILURE in case of error. */
int ARPHeader::setProtocolType(){
this->h.ar_pro=htons(0x0800); /* DEFAULT: IPv4 */
return OP_SUCCESS;
} /* End of setProtocolType() */
/** Returns value of attribute h.ar_pro */
u16 ARPHeader::getProtocolType(){
return ntohs(this->h.ar_pro);
} /* End of getProtocolType() */
/** Sets HwAddrLen.
* @return OP_SUCCESS on success and OP_FAILURE in case of error. */
int ARPHeader::setHwAddrLen(u8 val){
this->h.ar_hln=val;
return OP_SUCCESS;
} /* End of setHwAddrLen() */
/** Sets HwAddrLen.
* @return OP_SUCCESS on success and OP_FAILURE in case of error. */
int ARPHeader::setHwAddrLen(){
this->h.ar_hln=ETH_ADDRESS_LEN;
return OP_SUCCESS;
} /* End of setHwAddrLen() */
/** Returns value of attribute h.ar_hln */
u8 ARPHeader::getHwAddrLen(){
return this->h.ar_hln;
} /* End of getHwAddrLen() */
/** Sets ProtoAddrLen.
* @return OP_SUCCESS on success and OP_FAILURE in case of error. */
int ARPHeader::setProtoAddrLen(u8 val){
this->h.ar_pln=val;
return OP_SUCCESS;
} /* End of setProtoAddrLen() */
/** Sets ProtoAddrLen.
* @return OP_SUCCESS on success and OP_FAILURE in case of error. */
int ARPHeader::setProtoAddrLen(){
this->h.ar_pln=IPv4_ADDRESS_LEN; /* DEFAULT: IPv4 */
return OP_SUCCESS;
} /* End of setProtoAddrLen() */
/** Returns value of attribute h.ar_pln */
u8 ARPHeader::getProtoAddrLen(){
return this->h.ar_pln;
} /* End of getProtoAddrLen() */
/** Sets OpCode.
* @return OP_SUCCESS on success and OP_FAILURE in case of error. */
int ARPHeader::setOpCode(u16 val){
this->h.ar_op=htons(val);
return OP_SUCCESS;
} /* End of setOpCode() */
/** Returns value of attribute h.ar_op */
u16 ARPHeader::getOpCode(){
return ntohs(this->h.ar_op);
} /* End of getOpCode() */
/** Sets SenderMAC.
* @return OP_SUCCESS on success and OP_FAILURE in case of error. */
int ARPHeader::setSenderMAC(const u8 * val){
if(val==NULL)
return OP_FAILURE;
memcpy(this->h.data, val, ETH_ADDRESS_LEN);
return OP_SUCCESS;
} /* End of setSenderMAC() */
/** Returns value of attribute h.ar_sha */
u8 * ARPHeader::getSenderMAC(){
return this->h.data;
} /* End of getSenderMAC() */
/** Sets SenderIP.
* @return OP_SUCCESS on success and OP_FAILURE in case of error. */
int ARPHeader::setSenderIP(struct in_addr val){
memcpy(this->h.data+6, &val.s_addr, 4);
return OP_SUCCESS;
} /* End of setSenderIP() */
/** Returns value of attribute h.ar_sip */
u32 ARPHeader::getSenderIP(){
u32 *p = (u32 *)(this->h.data+6);
return *p;
} /* End of getSenderIP() */
/** Sets TargetMAC.
* @return OP_SUCCESS on success and OP_FAILURE in case of error. */
int ARPHeader::setTargetMAC(u8 * val){
if(val==NULL)
return OP_FAILURE;
memcpy(this->h.data+10, val, ETH_ADDRESS_LEN);
return OP_SUCCESS;
} /* End of setTargetMAC() */
/** Returns value of attribute h.ar_tha */
u8 * ARPHeader::getTargetMAC(){
return this->h.data+10;
} /* End of getTargetMAC() */
/** Sets TargetIP.
* @return OP_SUCCESS on success and OP_FAILURE in case of error. */
int ARPHeader::setTargetIP(struct in_addr val){
memcpy(this->h.data+16, &val.s_addr, 4);
return OP_SUCCESS;
} /* End of setTargetIP() */
/** Returns value of attribute h.ar_tip */
u32 ARPHeader::getTargetIP(){
u32 *p = (u32 *)(this->h.data+16);
return *p;
} /* End of getTargetIP() */
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