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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) 1996-2012 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 with the clarifications and exceptions described *
* below. 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@insecure.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 "derived works", yet *
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* 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: *
* o Integrates source code from Nmap *
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* not derivative works.) *
* o Integrates/includes/aggregates Nmap into a proprietary executable *
* installer, such as those produced by InstallShield. *
* o Links to a library or executes a program that does any of the above *
* *
* The term "Nmap" should be taken to also include any portions or derived *
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* If you have any questions about the GPL licensing restrictions on using *
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* we also offer alternative license to integrate Nmap into proprietary *
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* *
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* If you wish to specify special license conditions of your *
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* *
* This program is distributed in the hope that it will be useful, but *
* WITHOUT ANY WARRANTY; without even the implied warranty of *
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* *
***************************************************************************/
/* 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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