/*************************************************************************** * 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) 1996-2017 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, 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 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 "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 || lenreset(); /* 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 onyl 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()*/