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nmap/libnetutil/ICMPv6Option.cc

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/***************************************************************************
* ICMPv6Option.cc -- The ICMPv6Option Class represents an ICMP version 6 *
* option. 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) 1996-2018 Insecure.Com LLC ("The Nmap *
* Project"). Nmap is also a registered trademark of the Nmap Project. *
* 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, the Nmap Project 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. *
* *
* The Nmap Project has permission to redistribute Npcap, a packet *
* capturing driver and library for the Microsoft Windows platform. *
* Npcap is a separate work with it's own license rather than this Nmap *
* license. Since the Npcap license does not permit redistribution *
* without special permission, our Nmap Windows binary packages which *
* contain Npcap may not be redistributed without special permission. *
* *
* 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, we are happy to help. As mentioned above, we also *
* offer an 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 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 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 "ICMPv6Option.h"
ICMPv6Option::ICMPv6Option() {
this->reset();
} /* End of ICMPv6Option constructor */
ICMPv6Option::~ICMPv6Option() {
} /* End of ICMPv6Option destructor */
/** Sets every class attribute to zero */
void ICMPv6Option::reset(){
memset(&this->h, 0, sizeof(nping_icmpv6_option_t));
h_la = (link_addr_option_t *)this->h.data;
h_pi = (prefix_info_option_t *)this->h.data;
h_r = (redirect_option_t *)this->h.data;
h_mtu = (mtu_option_t *)this->h.data;
} /* 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 *ICMPv6Option::getBufferPointer(){
return (u8*)(&this->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 ICMPv6Option class is able to hold a maximum of
* sizeof(nping_icmpv6_option_t) bytes. If the supplied buffer is longer than
* that, only the first sizeof(nping_icmpv6_option_t) bytes will be stored in
* the internal buffer.
* @warning Supplied len MUST be at least ICMPv6_OPTION_MIN_HEADER_LEN bytes
* @return OP_SUCCESS on success and OP_FAILURE in case of error */
int ICMPv6Option::storeRecvData(const u8 *buf, size_t len){
if(buf==NULL || len<ICMPv6_OPTION_MIN_HEADER_LEN){
return OP_FAILURE;
}else{
int stored_len = MIN( sizeof(nping_icmpv6_option_t), len);
this->reset(); /* Re-init the object, just in case the caller had used it already */
this->length=stored_len;
memcpy(&(this->h), buf, stored_len);
}
return OP_SUCCESS;
} /* End of storeRecvData() */
int ICMPv6Option::protocol_id() const {
return HEADER_TYPE_ICMPv6_OPTION;
}
int ICMPv6Option::setType(u8 val){
this->h.type=val;
this->length = getHeaderLengthFromType(val);
this->h.length = this->length / 8;
return OP_SUCCESS;
} /* End of setType() */
u8 ICMPv6Option::getType(){
return this->h.type;
} /* End of getType() */
bool ICMPv6Option::validateType(u8 val){
switch( val ){
case ICMPv6_OPTION_SRC_LINK_ADDR:
case ICMPv6_OPTION_TGT_LINK_ADDR:
case ICMPv6_OPTION_PREFIX_INFO:
case ICMPv6_OPTION_REDIR_HDR:
case ICMPv6_OPTION_MTU:
return true;
break;
default:
return false;
break;
}
return false;
} /* End of validateType() */
int ICMPv6Option::setLength(u8 val){
this->h.length=val;
return OP_SUCCESS;
} /* End of setLength() */
u8 ICMPv6Option::getLength(){
return this->h.length;
} /* End of getLength() */
int ICMPv6Option::setLinkAddress(u8* val){
if(val==NULL)
return OP_FAILURE;
switch(this->h.type){
case ICMPv6_OPTION_SRC_LINK_ADDR:
case ICMPv6_OPTION_TGT_LINK_ADDR:
memcpy(this->h_la->link_addr, val, ICMPv6_OPTION_LINK_ADDRESS_LEN);
return OP_SUCCESS;
break;
default:
return OP_FAILURE;
break;
}
} /* End of setLinkAddress() */
u8 *ICMPv6Option::getLinkAddress(){
switch(this->h.type){
case ICMPv6_OPTION_SRC_LINK_ADDR:
case ICMPv6_OPTION_TGT_LINK_ADDR:
return this->h_la->link_addr;
break;
default:
return NULL;
break;
}
} /* End of getLinkAddress() */
int ICMPv6Option::setPrefixLength(u8 val){
if(this->h.type!=ICMPv6_OPTION_PREFIX_INFO)
return OP_FAILURE;
this->h_pi->prefix_length=val;
return OP_SUCCESS;
} /* End of setPrefixLength() */
u8 ICMPv6Option::getPrefixLength(){
if(this->h.type!=ICMPv6_OPTION_PREFIX_INFO)
return 0;
else
return this->h_pi->prefix_length;
} /* End of getPrefixLength() */
int ICMPv6Option::setFlags(u8 val){
if(this->h.type!=ICMPv6_OPTION_PREFIX_INFO)
return OP_FAILURE;
this->h_pi->flags=val;
return OP_SUCCESS;
} /* End of setFlags() */
u8 ICMPv6Option::getFlags(){
if(this->h.type!=ICMPv6_OPTION_PREFIX_INFO)
return 0;
else
return this->h_pi->flags;
} /* End of getFlags() */
int ICMPv6Option::setValidLifetime(u32 val){
if(this->h.type!=ICMPv6_OPTION_PREFIX_INFO)
return OP_FAILURE;
this->h_pi->valid_lifetime=htonl(val);
return OP_SUCCESS;
} /* End of setValidLifetime() */
u32 ICMPv6Option::getValidLifetime(){
if(this->h.type!=ICMPv6_OPTION_PREFIX_INFO)
return 0;
else
return ntohl(this->h_pi->valid_lifetime);
} /* End of getValidLifetime() */
int ICMPv6Option::setPreferredLifetime(u32 val){
if(this->h.type!=ICMPv6_OPTION_PREFIX_INFO)
return OP_FAILURE;
this->h_pi->preferred_lifetime=htonl(val);
return OP_SUCCESS;
} /* End of setPreferredLifetime() */
u32 ICMPv6Option::getPreferredLifetime(){
if(this->h.type!=ICMPv6_OPTION_PREFIX_INFO)
return 0;
else
return ntohl(this->h_pi->preferred_lifetime);
} /* End of getPreferredLifetime() */
int ICMPv6Option::setPrefix(u8 *val){
if(val==NULL || this->h.type!=ICMPv6_OPTION_PREFIX_INFO)
return OP_FAILURE;
else
memcpy(this->h_pi->prefix, val, 16);
return OP_SUCCESS;
} /* End of setPrefix() */
u8 *ICMPv6Option::getPrefix(){
if(this->h.type!=ICMPv6_OPTION_PREFIX_INFO)
return NULL;
else
return this->h_pi->prefix;
} /* End of getPrefix() */
int ICMPv6Option::setMTU(u32 val){
if(this->h.type!=ICMPv6_OPTION_MTU)
return OP_FAILURE;
this->h_mtu->mtu=htonl(val);
return OP_SUCCESS;
} /* End of setMTU() */
u32 ICMPv6Option::getMTU(){
if(this->h.type!=ICMPv6_OPTION_MTU)
return 0;
else
return ntohl(this->h_mtu->mtu);
} /* End of getMTU() */
/******************************************************************************/
/* MISCELLANEOUS STUFF */
/******************************************************************************/
/** Returns the standard ICMPv6 optiom length for the supplied option type.
* @warning Return value corresponds strictly to the ICMPv7 option header, this
* is, the minimum length of the OPTION, variable length payload is never
* included. For example, an ICMPv6 Redirect option has a fixed header of 8
* bytes but then it may contain an IPv6 header. We only return 8
* because we don't know in advance the total number of bytes for the message.
* Same applies to the rest of types. */
int ICMPv6Option::getHeaderLengthFromType(u8 type){
switch( type ){
case ICMPv6_OPTION_SRC_LINK_ADDR:
return ICMPv6_OPTION_SRC_LINK_ADDR_LEN;
break;
case ICMPv6_OPTION_TGT_LINK_ADDR:
return ICMPv6_OPTION_TGT_LINK_ADDR_LEN;
break;
case ICMPv6_OPTION_PREFIX_INFO:
return ICMPv6_OPTION_PREFIX_INFO_LEN;
break;
case ICMPv6_OPTION_REDIR_HDR:
return ICMPv6_OPTION_REDIR_HDR_LEN;
break;
case ICMPv6_OPTION_MTU:
return ICMPv6_OPTION_MTU_LEN;
break;
/* Packets with non RFC-Compliant option types will be represented as an
* 8-byte ICMPv6 option. */
default:
return ICMPv6_OPTION_MIN_HEADER_LEN;
break;
}
} /* End of getHeaderLengthFromType() */
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