mirror of
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509 lines
17 KiB
C++
509 lines
17 KiB
C++
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/***************************************************************************
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* IPv6Header.cc -- The IPv6Header Class represents an IPv4 datagram. 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 "IPv6Header.h"
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/******************************************************************************/
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/* CONTRUCTORS, DESTRUCTORS AND INITIALIZATION METHODS */
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/******************************************************************************/
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IPv6Header::IPv6Header() {
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this->reset();
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} /* End of IPv6Header constructor */
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IPv6Header::~IPv6Header() {
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} /* End of IPv6Header destructor */
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/** Sets every attribute to its default value */
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void IPv6Header::reset(){
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memset(&this->h, 0, sizeof(nping_ipv6_hdr_t));
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this->length=IPv6_HEADER_LEN;
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this->setVersion();
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this->setTrafficClass(IPv6_DEFAULT_TCLASS);
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this->setFlowLabel(IPv6_DEFAULT_FLABEL);
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this->setHopLimit(IPv6_DEFAULT_HOPLIM);
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this->setNextHeader(IPv6_DEFAULT_NXTHDR); /* No next header */
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this->setPayloadLength(0);
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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 *IPv6Header::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 IPv6Header class is able to hold a maximum of 40 bytes. If the
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* supplied buffer is longer than that, only the first 40 bytes will be stored
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* in the internal buffer.
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* @warning Supplied len MUST be at least 40 bytes (IPv6 header length).
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* @return OP_SUCCESS on success and OP_FAILURE in case of error */
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int IPv6Header::storeRecvData(const u8 *buf, size_t len){
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if(buf==NULL || len<IPv6_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=IPv6_HEADER_LEN;
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memcpy(&(this->h), buf, IPv6_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 IPv6Header::protocol_id() const {
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return HEADER_TYPE_IPv6;
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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 IPv6Header::validate(){
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if( this->length!=IPv6_HEADER_LEN)
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return OP_FAILURE;
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else
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return IPv6_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 IPv6Header::print(FILE *output, int detail) const {
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static char ipstring[256];
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memset(ipstring, 0, 256);
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struct in6_addr addr;
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char ipinfo[512] = ""; /* Temp info about IP. */
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fprintf(output, "IPv6[");
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this->getSourceAddress(&addr);
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inet_ntop(AF_INET6, &addr, ipstring, sizeof(ipstring));
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fprintf(output, "%s", ipstring);
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fprintf(output, " >");
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this->getDestinationAddress(&addr);
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inet_ntop(AF_INET6, &addr, ipstring, sizeof(ipstring));
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fprintf(output, " %s", ipstring);
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/* Create a string with information relevant to the specified level of detail */
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if( detail == PRINT_DETAIL_LOW ){
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Snprintf(ipinfo, sizeof(ipinfo), "hlim=%d", this->getHopLimit());
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}else if( detail == PRINT_DETAIL_MED ){
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Snprintf(ipinfo, sizeof(ipinfo), "hlim=%d tclass=%d flow=%d",
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this->getHopLimit(), this->getTrafficClass(), this->getFlowLabel() );
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}else if( detail>=PRINT_DETAIL_HIGH ){
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Snprintf(ipinfo, sizeof(ipinfo), "ver=%d hlim=%d tclass=%d flow=%d plen=%d nh=%d",
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this->getVersion(), this->getHopLimit(), this->getTrafficClass(),
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this->getFlowLabel(), this->getPayloadLength(), this->getNextHeader() );
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}
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fprintf(output, " %s]", ipinfo);
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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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/** Set Version field (4 bits). */
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int IPv6Header::setVersion(u8 val){
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union{
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struct firstbyte{
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#if WORDS_BIGENDIAN
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u8 ver:4;
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u8 tclass:4;
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#else
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u8 tclass:4;
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u8 ver:4;
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#endif
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}halfbyte;
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u8 fullbyte;
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}header1stbyte;
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header1stbyte.fullbyte = h.ip6_start[0];
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header1stbyte.halfbyte.ver=val;
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h.ip6_start[0]=header1stbyte.fullbyte;
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return OP_SUCCESS;
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} /* End of setVersion() */
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/** Set Version field to value 6. */
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int IPv6Header::setVersion(){
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this->setVersion(6);
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return OP_SUCCESS;
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} /* End of setVersion() */
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/** Returns an 8bit number containing the value of the Version field. */
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u8 IPv6Header::getVersion() const {
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union{
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struct firstbyte{
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#if WORDS_BIGENDIAN
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u8 ver:4;
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u8 tclass:4;
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#else
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u8 tclass:4;
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u8 ver:4;
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#endif
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}halfbyte;
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u8 fullbyte;
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}header1stbyte;
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header1stbyte.fullbyte = h.ip6_start[0];
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return (u8)header1stbyte.halfbyte.ver;
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} /* End of getVersion() */
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int IPv6Header::setTrafficClass(u8 val){
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union{
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struct firstbyte{
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#if WORDS_BIGENDIAN
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u8 ver:4;
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u8 tclass1:4;
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#else
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u8 tclass1:4;
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u8 ver:4;
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#endif
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}halfbyte;
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u8 fullbyte;
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}header1stbyte;
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union{
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struct firstbyte{
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#if WORDS_BIGENDIAN
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u8 tclass2:4;
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u8 flow:4;
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#else
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u8 flow:4;
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u8 tclass2:4;
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#endif
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}halfbyte;
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u8 fullbyte;
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}header2ndbyte;
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/* Store old contents */
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header1stbyte.fullbyte = h.ip6_start[0];
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header2ndbyte.fullbyte = h.ip6_start[1];
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/* Fill the two 4bit halves */
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header1stbyte.halfbyte.tclass1=val>>4;
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header2ndbyte.halfbyte.tclass2=val;
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/* Write the bytes back to the header */
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h.ip6_start[0]=header1stbyte.fullbyte;
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h.ip6_start[1]=header2ndbyte.fullbyte;
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return OP_SUCCESS;
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} /* End of setTrafficClass() */
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u8 IPv6Header::getTrafficClass() const {
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union{
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struct firstbyte{
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#if WORDS_BIGENDIAN
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u8 ver:4;
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u8 tclass1:4;
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#else
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u8 tclass1:4;
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u8 ver:4;
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#endif
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}halfbyte;
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u8 fullbyte;
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}header1stbyte;
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union{
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struct firstbyte{
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#if WORDS_BIGENDIAN
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u8 tclass2:4;
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u8 flow:4;
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#else
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u8 flow:4;
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u8 tclass2:4;
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#endif
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}halfbyte;
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u8 fullbyte;
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}header2ndbyte;
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union{
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struct firstbyte{
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#if WORDS_BIGENDIAN
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u8 tclass1:4;
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u8 tclass2:4;
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#else
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u8 tclass2:4;
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u8 tclass1:4;
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#endif
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}halfbyte;
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u8 fullbyte;
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}finalbyte;
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header1stbyte.fullbyte = h.ip6_start[0];
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header2ndbyte.fullbyte = h.ip6_start[1];
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finalbyte.halfbyte.tclass1=header1stbyte.halfbyte.tclass1;
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finalbyte.halfbyte.tclass2=header2ndbyte.halfbyte.tclass2;
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return finalbyte.fullbyte;
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} /* End of getTrafficClass() */
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int IPv6Header::setFlowLabel(u32 val){
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u32 netbyte = htonl(val);
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u8 *pnt=(u8*)&netbyte;
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union{
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struct firstbyte{
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#if WORDS_BIGENDIAN
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u8 tclass2:4;
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u8 flow:4;
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#else
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u8 flow:4;
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u8 tclass2:4;
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#endif
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}halfbyte;
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u8 fullbyte;
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}header2ndbyte;
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header2ndbyte.fullbyte = h.ip6_start[1];
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header2ndbyte.halfbyte.flow=pnt[1];
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h.ip6_start[1]=header2ndbyte.fullbyte;
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h.ip6_start[2]=pnt[2];
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h.ip6_start[3]=pnt[3];
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return OP_SUCCESS;
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} /* End of setFlowLabel() */
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u32 IPv6Header::getFlowLabel() const {
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u32 hostbyte=0;
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u8 *pnt=(u8*)&hostbyte;
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union{
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struct firstbyte{
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#if WORDS_BIGENDIAN
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u8 tclass2:4;
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u8 flow:4;
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#else
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u8 flow:4;
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u8 tclass2:4;
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#endif
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}halfbyte;
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u8 fullbyte;
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}header2ndbyte;
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header2ndbyte.fullbyte = h.ip6_start[1];
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pnt[0]=0;
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pnt[1]=header2ndbyte.halfbyte.flow;
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pnt[2]=h.ip6_start[2];
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pnt[3]=h.ip6_start[3];
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hostbyte=ntohl(hostbyte);
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return hostbyte;
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} /* End of getFlowLabel() */
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int IPv6Header::setPayloadLength(u16 val){
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this->h.ip6_len = htons(val);
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return OP_SUCCESS;
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} /* End of setPayloadLength() */
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int IPv6Header::setPayloadLength(){
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int otherslen=0;
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if (next!=NULL)
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otherslen=next->getLen();
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setPayloadLength( otherslen );
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return OP_SUCCESS;
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} /* End of setTotalLength() */
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u16 IPv6Header::getPayloadLength() const {
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return ntohs(this->h.ip6_len);
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} /* End of getPayloadLength() */
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int IPv6Header::setNextHeader(u8 val){
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this->h.ip6_nh = val;
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return OP_SUCCESS;
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} /* End of setNextHeader() */
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u8 IPv6Header::getNextHeader() const {
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return this->h.ip6_nh;
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} /* End of getNextHeader() */
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/** Sets field "next header" to the number that corresponds to the supplied
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* protocol name. Currently only TCP, UDP and ICMP are supported. Any
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* help to extend this functionality would be appreciated. For a list of all
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* proto names and numbers check:
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* http://www.iana.org/assignments/protocol-numbers/ */
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int IPv6Header::setNextHeader(const char *p){
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if (p==NULL){
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printf("setNextProto(): NULL pointer supplied\n");
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return OP_FAILURE;
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}
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if( !strcasecmp(p, "TCP") )
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setNextHeader(6); /* 6=IANA number for proto TCP */
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else if( !strcasecmp(p, "UDP") )
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setNextHeader(17); /* 17=IANA number for proto UDP */
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else if( !strcasecmp(p, "ICMPv6"))
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setNextHeader(58); /* 58=IANA number for proto ICMPv6 */
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else
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netutil_fatal("setNextProto(): Invalid protocol number\n");
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return OP_SUCCESS;
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} /* End of setNextHeader() */
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int IPv6Header::setHopLimit(u8 val){
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this->h.ip6_hopl = val;
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return OP_SUCCESS;
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} /* End of setHopLimit() */
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u8 IPv6Header::getHopLimit() const {
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return this->h.ip6_hopl;
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} /* End of getHopLimit() */
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int IPv6Header::setSourceAddress(u8 *val){
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if(val==NULL)
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netutil_fatal("setSourceAddress(): NULL value supplied.");
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memcpy(this->h.ip6_src, val, 16);
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return OP_SUCCESS;
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} /* End of setSourceAddress() */
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int IPv6Header::setSourceAddress(struct in6_addr val){
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memcpy(this->h.ip6_src, val.s6_addr, 16);
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return OP_SUCCESS;
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} /* End of setSourceAddress() */
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const u8 *IPv6Header::getSourceAddress() const {
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return this->h.ip6_src;
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} /* End of getSourceAddress() */
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/** Returns source IPv6 address
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* @warning Returned value is in NETWORK byte order. */
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struct in6_addr IPv6Header::getSourceAddress(struct in6_addr *result) const {
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struct in6_addr myaddr;
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memset(&myaddr, 0, sizeof(myaddr));
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memcpy(myaddr.s6_addr, this->h.ip6_src, 16);
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if(result!=NULL)
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*result=myaddr;
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return myaddr;
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} /* End of getSourceAddress() */
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int IPv6Header::setDestinationAddress(u8 *val){
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if(val==NULL)
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netutil_fatal("setDestinationAddress(): NULL value supplied.");
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memcpy(this->h.ip6_dst, val, 16);
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return OP_SUCCESS;
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} /* End of setDestinationAddress() */
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int IPv6Header::setDestinationAddress(struct in6_addr val){
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memcpy(this->h.ip6_dst, val.s6_addr, 16);
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return OP_SUCCESS;
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} /* End of setDestinationAddress() */
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/** Returns destination IPv6 address. */
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const u8 *IPv6Header::getDestinationAddress() const {
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return this->h.ip6_dst;
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} /* End of getDestinationAddress() */
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/** Returns destination IPv6 address
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* @warning Returned value is in NETWORK byte order. */
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struct in6_addr IPv6Header::getDestinationAddress(struct in6_addr *result) const {
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struct in6_addr myaddr;
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memset(&myaddr, 0, sizeof(myaddr));
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memcpy(myaddr.s6_addr, this->h.ip6_dst, 16);
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if(result!=NULL)
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*result=myaddr;
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return myaddr;
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} /* End of getDestinationAddress() */
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/** Returns the length of an IPv4 address. */
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u16 IPv6Header::getAddressLength() const {
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return 16;
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} /* End of getAddressLength()*/
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