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nmap/libnetutil/IPv6Header.cc
dmiller 6db5c9cb85 Bump copyright date
2025-02-26 17:44:43 +00:00

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/***************************************************************************
* IPv6Header.cc -- The IPv6Header Class represents an IPv4 datagram. 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) 1996-2025 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 "IPv6Header.h"
/******************************************************************************/
/* CONTRUCTORS, DESTRUCTORS AND INITIALIZATION METHODS */
/******************************************************************************/
IPv6Header::IPv6Header() {
this->reset();
} /* End of IPv6Header constructor */
IPv6Header::~IPv6Header() {
} /* End of IPv6Header destructor */
/** Sets every attribute to its default value */
void IPv6Header::reset(){
memset(&this->h, 0, sizeof(nping_ipv6_hdr_t));
this->length=IPv6_HEADER_LEN;
this->setVersion();
this->setTrafficClass(IPv6_DEFAULT_TCLASS);
this->setFlowLabel(IPv6_DEFAULT_FLABEL);
this->setHopLimit(IPv6_DEFAULT_HOPLIM);
this->setNextHeader(IPv6_DEFAULT_NXTHDR); /* No next header */
this->setPayloadLength(0);
} /* 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 *IPv6Header::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 IPv6Header class is able to hold a maximum of 40 bytes. If the
* supplied buffer is longer than that, only the first 40 bytes will be stored
* in the internal buffer.
* @warning Supplied len MUST be at least 40 bytes (IPv6 header length).
* @return OP_SUCCESS on success and OP_FAILURE in case of error */
int IPv6Header::storeRecvData(const u8 *buf, size_t len){
if(buf==NULL || len<IPv6_HEADER_LEN){
return OP_FAILURE;
}else{
this->reset(); /* Re-init the object, just in case the caller had used it already */
this->length=IPv6_HEADER_LEN;
memcpy(&(this->h), buf, IPv6_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 IPv6Header::protocol_id() const {
return HEADER_TYPE_IPv6;
} /* 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 IPv6Header::validate(){
if( this->length!=IPv6_HEADER_LEN)
return OP_FAILURE;
else
return IPv6_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 IPv6Header::print(FILE *output, int detail) const {
static char ipstring[256];
memset(ipstring, 0, 256);
struct in6_addr addr;
char ipinfo[512] = ""; /* Temp info about IP. */
fprintf(output, "IPv6[");
this->getSourceAddress(&addr);
inet_ntop(AF_INET6, &addr, ipstring, sizeof(ipstring));
fprintf(output, "%s", ipstring);
fprintf(output, " >");
this->getDestinationAddress(&addr);
inet_ntop(AF_INET6, &addr, ipstring, sizeof(ipstring));
fprintf(output, " %s", ipstring);
/* Create a string with information relevant to the specified level of detail */
if( detail == PRINT_DETAIL_LOW ){
Snprintf(ipinfo, sizeof(ipinfo), "hlim=%d", this->getHopLimit());
}else if( detail == PRINT_DETAIL_MED ){
Snprintf(ipinfo, sizeof(ipinfo), "hlim=%d tclass=%d flow=%d",
this->getHopLimit(), this->getTrafficClass(), this->getFlowLabel() );
}else if( detail>=PRINT_DETAIL_HIGH ){
Snprintf(ipinfo, sizeof(ipinfo), "ver=%d hlim=%d tclass=%d flow=%d plen=%d nh=%d",
this->getVersion(), this->getHopLimit(), this->getTrafficClass(),
this->getFlowLabel(), this->getPayloadLength(), this->getNextHeader() );
}
fprintf(output, " %s]", ipinfo);
if(this->next!=NULL){
print_separator(output, detail);
next->print(output, detail);
}
return OP_SUCCESS;
} /* End of print() */
/******************************************************************************/
/* PROTOCOL-SPECIFIC METHODS */
/******************************************************************************/
/** Set Version field (4 bits). */
int IPv6Header::setVersion(u8 val){
union{
struct firstbyte{
#if WORDS_BIGENDIAN
u8 ver:4;
u8 tclass:4;
#else
u8 tclass:4;
u8 ver:4;
#endif
}halfbyte;
u8 fullbyte;
}header1stbyte;
header1stbyte.fullbyte = h.ip6_start[0];
header1stbyte.halfbyte.ver=val;
h.ip6_start[0]=header1stbyte.fullbyte;
return OP_SUCCESS;
} /* End of setVersion() */
/** Set Version field to value 6. */
int IPv6Header::setVersion(){
this->setVersion(6);
return OP_SUCCESS;
} /* End of setVersion() */
/** Returns an 8bit number containing the value of the Version field. */
u8 IPv6Header::getVersion() const {
union{
struct firstbyte{
#if WORDS_BIGENDIAN
u8 ver:4;
u8 tclass:4;
#else
u8 tclass:4;
u8 ver:4;
#endif
}halfbyte;
u8 fullbyte;
}header1stbyte;
header1stbyte.fullbyte = h.ip6_start[0];
return (u8)header1stbyte.halfbyte.ver;
} /* End of getVersion() */
int IPv6Header::setTrafficClass(u8 val){
union{
struct firstbyte{
#if WORDS_BIGENDIAN
u8 ver:4;
u8 tclass1:4;
#else
u8 tclass1:4;
u8 ver:4;
#endif
}halfbyte;
u8 fullbyte;
}header1stbyte;
union{
struct firstbyte{
#if WORDS_BIGENDIAN
u8 tclass2:4;
u8 flow:4;
#else
u8 flow:4;
u8 tclass2:4;
#endif
}halfbyte;
u8 fullbyte;
}header2ndbyte;
/* Store old contents */
header1stbyte.fullbyte = h.ip6_start[0];
header2ndbyte.fullbyte = h.ip6_start[1];
/* Fill the two 4bit halves */
header1stbyte.halfbyte.tclass1=val>>4;
header2ndbyte.halfbyte.tclass2=val;
/* Write the bytes back to the header */
h.ip6_start[0]=header1stbyte.fullbyte;
h.ip6_start[1]=header2ndbyte.fullbyte;
return OP_SUCCESS;
} /* End of setTrafficClass() */
u8 IPv6Header::getTrafficClass() const {
union{
struct firstbyte{
#if WORDS_BIGENDIAN
u8 ver:4;
u8 tclass1:4;
#else
u8 tclass1:4;
u8 ver:4;
#endif
}halfbyte;
u8 fullbyte;
}header1stbyte;
union{
struct firstbyte{
#if WORDS_BIGENDIAN
u8 tclass2:4;
u8 flow:4;
#else
u8 flow:4;
u8 tclass2:4;
#endif
}halfbyte;
u8 fullbyte;
}header2ndbyte;
union{
struct firstbyte{
#if WORDS_BIGENDIAN
u8 tclass1:4;
u8 tclass2:4;
#else
u8 tclass2:4;
u8 tclass1:4;
#endif
}halfbyte;
u8 fullbyte;
}finalbyte;
header1stbyte.fullbyte = h.ip6_start[0];
header2ndbyte.fullbyte = h.ip6_start[1];
finalbyte.halfbyte.tclass1=header1stbyte.halfbyte.tclass1;
finalbyte.halfbyte.tclass2=header2ndbyte.halfbyte.tclass2;
return finalbyte.fullbyte;
} /* End of getTrafficClass() */
int IPv6Header::setFlowLabel(u32 val){
u32 netbyte = htonl(val);
u8 *pnt=(u8*)&netbyte;
union{
struct firstbyte{
#if WORDS_BIGENDIAN
u8 tclass2:4;
u8 flow:4;
#else
u8 flow:4;
u8 tclass2:4;
#endif
}halfbyte;
u8 fullbyte;
}header2ndbyte;
header2ndbyte.fullbyte = h.ip6_start[1];
header2ndbyte.halfbyte.flow=pnt[1];
h.ip6_start[1]=header2ndbyte.fullbyte;
h.ip6_start[2]=pnt[2];
h.ip6_start[3]=pnt[3];
return OP_SUCCESS;
} /* End of setFlowLabel() */
u32 IPv6Header::getFlowLabel() const {
u32 hostbyte=0;
u8 *pnt=(u8*)&hostbyte;
union{
struct firstbyte{
#if WORDS_BIGENDIAN
u8 tclass2:4;
u8 flow:4;
#else
u8 flow:4;
u8 tclass2:4;
#endif
}halfbyte;
u8 fullbyte;
}header2ndbyte;
header2ndbyte.fullbyte = h.ip6_start[1];
pnt[0]=0;
pnt[1]=header2ndbyte.halfbyte.flow;
pnt[2]=h.ip6_start[2];
pnt[3]=h.ip6_start[3];
hostbyte=ntohl(hostbyte);
return hostbyte;
} /* End of getFlowLabel() */
int IPv6Header::setPayloadLength(u16 val){
this->h.ip6_len = htons(val);
return OP_SUCCESS;
} /* End of setPayloadLength() */
int IPv6Header::setPayloadLength(){
int otherslen=0;
if (next!=NULL)
otherslen=next->getLen();
setPayloadLength( otherslen );
return OP_SUCCESS;
} /* End of setTotalLength() */
u16 IPv6Header::getPayloadLength() const {
return ntohs(this->h.ip6_len);
} /* End of getPayloadLength() */
int IPv6Header::setNextHeader(u8 val){
this->h.ip6_nh = val;
return OP_SUCCESS;
} /* End of setNextHeader() */
u8 IPv6Header::getNextHeader() const {
return this->h.ip6_nh;
} /* End of getNextHeader() */
/** Sets field "next header" to the number that corresponds to the supplied
* protocol name. Currently only TCP, UDP and ICMP are supported. Any
* help to extend this functionality would be appreciated. For a list of all
* proto names and numbers check:
* http://www.iana.org/assignments/protocol-numbers/ */
int IPv6Header::setNextHeader(const char *p){
if (p==NULL){
printf("setNextProto(): NULL pointer supplied\n");
return OP_FAILURE;
}
if( !strcasecmp(p, "TCP") )
setNextHeader(6); /* 6=IANA number for proto TCP */
else if( !strcasecmp(p, "UDP") )
setNextHeader(17); /* 17=IANA number for proto UDP */
else if( !strcasecmp(p, "ICMPv6"))
setNextHeader(58); /* 58=IANA number for proto ICMPv6 */
else
netutil_fatal("setNextProto(): Invalid protocol number\n");
return OP_SUCCESS;
} /* End of setNextHeader() */
int IPv6Header::setHopLimit(u8 val){
this->h.ip6_hopl = val;
return OP_SUCCESS;
} /* End of setHopLimit() */
u8 IPv6Header::getHopLimit() const {
return this->h.ip6_hopl;
} /* End of getHopLimit() */
int IPv6Header::setSourceAddress(u8 *val){
if(val==NULL)
netutil_fatal("setSourceAddress(): NULL value supplied.");
memcpy(this->h.ip6_src, val, 16);
return OP_SUCCESS;
} /* End of setSourceAddress() */
int IPv6Header::setSourceAddress(struct in6_addr val){
memcpy(this->h.ip6_src, val.s6_addr, 16);
return OP_SUCCESS;
} /* End of setSourceAddress() */
const u8 *IPv6Header::getSourceAddress() const {
return this->h.ip6_src;
} /* End of getSourceAddress() */
/** Returns source IPv6 address
* @warning Returned value is in NETWORK byte order. */
struct in6_addr IPv6Header::getSourceAddress(struct in6_addr *result) const {
struct in6_addr myaddr;
memset(&myaddr, 0, sizeof(myaddr));
memcpy(myaddr.s6_addr, this->h.ip6_src, 16);
if(result!=NULL)
*result=myaddr;
return myaddr;
} /* End of getSourceAddress() */
int IPv6Header::setDestinationAddress(u8 *val){
if(val==NULL)
netutil_fatal("setDestinationAddress(): NULL value supplied.");
memcpy(this->h.ip6_dst, val, 16);
return OP_SUCCESS;
} /* End of setDestinationAddress() */
int IPv6Header::setDestinationAddress(struct in6_addr val){
memcpy(this->h.ip6_dst, val.s6_addr, 16);
return OP_SUCCESS;
} /* End of setDestinationAddress() */
/** Returns destination IPv6 address. */
const u8 *IPv6Header::getDestinationAddress() const {
return this->h.ip6_dst;
} /* End of getDestinationAddress() */
/** Returns destination IPv6 address
* @warning Returned value is in NETWORK byte order. */
struct in6_addr IPv6Header::getDestinationAddress(struct in6_addr *result) const {
struct in6_addr myaddr;
memset(&myaddr, 0, sizeof(myaddr));
memcpy(myaddr.s6_addr, this->h.ip6_dst, 16);
if(result!=NULL)
*result=myaddr;
return myaddr;
} /* End of getDestinationAddress() */
/** Returns the length of an IPv4 address. */
u16 IPv6Header::getAddressLength() const {
return 16;
} /* End of getAddressLength()*/
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