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nmap/libnetutil/ARPHeader.cc

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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) 1996-2013 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 ("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, Insecure.Com LLC 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. *
* *
* 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 (Insecure.Com LLC) 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 "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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