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+/***************************************************************************
+ * PacketElement.h -- The PacketElement Class is a generic class that *
+ * represents a protocol header or a part of a network packet. Many other *
+ * classes inherit from it (NetworkLayerElement, TransportLayerElement, *
+ * etc). *
+ * *
+ ***********************IMPORTANT NMAP LICENSE TERMS************************
+ *
+ * The Nmap Security Scanner is (C) 1996-2023 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. */
+
+#ifndef PACKETELEMENT_H
+#define PACKETELEMENT_H 1
+
+#include "nbase.h"
+#include "netutil.h"
+
+#define HEADER_TYPE_IPv6_HOPOPT 0 /* IPv6 Hop-by-Hop Option */
+#define HEADER_TYPE_ICMPv4 1 /* ICMP Internet Control Message */
+#define HEADER_TYPE_IGMP 2 /* IGMP Internet Group Management */
+#define HEADER_TYPE_IPv4 4 /* IPv4 IPv4 encapsulation */
+#define HEADER_TYPE_TCP 6 /* TCP Transmission Control */
+#define HEADER_TYPE_EGP 8 /* EGP Exterior Gateway Protocol */
+#define HEADER_TYPE_UDP 17 /* UDP User Datagram */
+#define HEADER_TYPE_IPv6 41 /* IPv6 IPv6 encapsulation */
+#define HEADER_TYPE_IPv6_ROUTE 43 /* IPv6-Route Routing Header for IPv6 */
+#define HEADER_TYPE_IPv6_FRAG 44 /* IPv6-Frag Fragment Header for IPv6 */
+#define HEADER_TYPE_GRE 47 /* GRE General Routing Encapsulation */
+#define HEADER_TYPE_ESP 50 /* ESP Encap Security Payload */
+#define HEADER_TYPE_AH 51 /* AH Authentication Header */
+#define HEADER_TYPE_ICMPv6 58 /* IPv6-ICMP ICMP for IPv6 */
+#define HEADER_TYPE_IPv6_NONXT 59 /* IPv6-NoNxt No Next Header for IPv6 */
+#define HEADER_TYPE_IPv6_OPTS 60 /* IPv6-Opts IPv6 Destination Options */
+#define HEADER_TYPE_EIGRP 88 /* EIGRP */
+#define HEADER_TYPE_ETHERNET 97 /* Ethernet */
+#define HEADER_TYPE_L2TP 115 /* L2TP Layer Two Tunneling Protocol */
+#define HEADER_TYPE_SCTP 132 /* SCTP Stream Control Transmission P. */
+#define HEADER_TYPE_IPv6_MOBILE 135 /* Mobility Header */
+#define HEADER_TYPE_MPLS_IN_IP 137 /* MPLS-in-IP */
+#define HEADER_TYPE_ARP 2054 /* ARP Address Resolution Protocol */
+#define HEADER_TYPE_ICMPv6_OPTION 9997 /* ICMPv6 option */
+#define HEADER_TYPE_NEP 9998 /* Nping Echo Protocol */
+#define HEADER_TYPE_RAW_DATA 9999 /* Raw unknown data */
+
+#define PRINT_DETAIL_LOW 1
+#define PRINT_DETAIL_MED 2
+#define PRINT_DETAIL_HIGH 3
+
+#define DEFAULT_PRINT_DETAIL (PRINT_DETAIL_LOW)
+#define DEFAULT_PRINT_DESCRIPTOR stdout
+
+class PacketElement {
+
+ protected:
+
+ int length;
+ PacketElement *next; /**< Next PacketElement (next proto header) */
+ PacketElement *prev; /**< Prev PacketElement (previous proto header) */
+
+ public:
+
+ PacketElement();
+
+ virtual ~PacketElement(){
+
+ } /* End of PacketElement destructor */
+
+ /** This function MUST be overwritten on ANY class that inherits from
+ * this one. Otherwise getBinaryBuffer will fail */
+ virtual u8 * getBufferPointer(){
+ netutil_fatal("getBufferPointer(): Attempting to use superclass PacketElement method.\n");
+ return NULL;
+ } /* End of getBufferPointer() */
+
+
+ /** Returns a buffer that contains the header of the packet + all the
+ * lower level headers and payload. Returned buffer should be ok to be
+ * passes to a send() call to be transferred trough a socket.
+ * @return a pointer to a free()able buffer that contains packet's binary
+ * data.
+ * @warning If there are linked elements, their getBinaryBuffer() method
+ * will be called recursively and the buffers that they return WILL be
+ * free()d as soon as we copy the data in our own allocated buffer.
+ * @warning Calls to this method may not ve very efficient since they
+ * always involved a few malloc()s and free()s. If you want efficiency
+ * use dumpToBinaryBuffer(); */
+ virtual u8 * getBinaryBuffer(){
+ u8 *ourbuff=NULL;
+ u8 *othersbuff=NULL;
+ u8 *totalbuff=NULL;
+ long otherslen=0;
+
+ /* Get our own buffer address */
+ if ( (ourbuff=getBufferPointer()) == NULL ){
+ netutil_fatal("getBinaryBuffer(): Couldn't get own data pointer\n");
+ }
+ if( next != NULL ){ /* There is some other packet element */
+ othersbuff = next->getBinaryBuffer();
+ otherslen=next->getLen();
+ totalbuff=(u8 *)safe_zalloc(otherslen + length);
+ memcpy(totalbuff, ourbuff, length);
+ memcpy(totalbuff+length, othersbuff, otherslen);
+ free(othersbuff);
+ }else{
+ totalbuff=(u8 *)safe_zalloc(length);
+ memcpy(totalbuff, ourbuff, length);
+ }
+ return totalbuff;
+ } /* End of getBinaryBuffer() */
+
+
+ virtual int dumpToBinaryBuffer(u8* dst, int maxlen){
+ u8 *ourbuff=NULL;
+ long ourlength=0;
+ /* Get our own buffer address and length */
+ if ( (ourbuff=getBufferPointer()) == NULL || (ourlength=this->length) < 0 )
+ netutil_fatal("getBinaryBuffer(): Couldn't get own data pointer\n");
+ /* Copy our part of the buffer */
+ if ( maxlen < ourlength )
+ netutil_fatal("getBinaryBuffer(): Packet exceeds maximum length %d\n", maxlen);
+ memcpy( dst, ourbuff, ourlength);
+ /* If there are more elements, tell them to copy their part */
+ if( next!= NULL ){
+ next->dumpToBinaryBuffer(dst+ourlength, maxlen-ourlength);
+ }
+ return this->getLen();
+ } /* End of dumpToBinaryBuffer() */
+
+
+ /** Does the same as the previous one but it stores the length of the
+ * return buffer on the memory pointed by the supplied int pointer. */
+ virtual u8 * getBinaryBuffer(int *len){
+ u8 *buff = getBinaryBuffer();
+ if( len != NULL )
+ *len = getLen();
+ return buff;
+ } /* End of getBinaryBuffer() */
+
+
+ /** Returns the length of this PacketElement + the length of all the
+ * PacketElements that are next to it (are linked trough the "next"
+ * attribute). So for example, if we have IPv4Header p1, linked to
+ * a TCPHeader p2, representing a simple TCP SYN with no options,
+ * a call to p1.getLen() will return 20 (IP header with no options) + 20
+ * (TCP header with no options) = 40 bytes. */
+ int getLen() const {
+ /* If we have some other packet element linked, get its length */
+ if (next!=NULL)
+ return length + next->getLen();
+ else
+ return length;
+ } /* End of getLen() */
+
+
+ /** Returns the address of the next PacketElement that is linked to this */
+ virtual PacketElement *getNextElement() const {
+ return next;
+ } /* End of getNextElement() */
+
+
+ /** Links current object with the next header in the protocol chain. Note
+ * that this method also links the next element with this one, calling
+ * setPrevElement(). */
+ virtual int setNextElement(PacketElement *n){
+ next=n;
+ if(next!=NULL)
+ next->setPrevElement(this);
+ return OP_SUCCESS;
+ } /* End of setNextElement() */
+
+ /** Sets attribute prev with the supplied pointer value.
+ * @warning Supplied pointer must point to a PacketElement object or
+ * an object that inherits from it. */
+ virtual int setPrevElement(PacketElement *n){
+ this->prev=n;
+ return OP_SUCCESS;
+ } /* End of setPrevElement() */
+
+
+ /** Returns the address of the previous PacketElement that is linked to
+ * this one.
+ * @warning In many cases this function will return NULL since there is
+ * a high probability that the user of this class does not link
+ * PacketElements in both directions. Normally one would set attribute
+ * "next" of an IPHeader object to the TCPHeader that follows it, but
+ * not the other way around. */
+ virtual PacketElement *getPrevElement(){
+ return prev;
+ } /* End of getPrevElement() */
+
+ /** This method should be overwritten by any class that inherits from
+ * PacketElement. It should print the object contents and then call
+ * this->next->print(), providing this->next!=NULL */
+ virtual int print(FILE *output, int detail) const {
+ if(this->next!=NULL)
+ this->next->print(output, detail);
+ return OP_SUCCESS;
+ } /* End of printf() */
+
+ virtual int print() const {
+ return print(DEFAULT_PRINT_DESCRIPTOR, DEFAULT_PRINT_DETAIL);
+ }
+
+ virtual int print(int detail) const {
+ return print(DEFAULT_PRINT_DESCRIPTOR, detail);
+ }
+
+ virtual void print_separator(FILE *output, int detail) const {
+ fprintf(output, " ");
+ }
+
+ /* Returns the type of protocol an object represents. This method MUST
+ * be overwritten by all children. */
+ virtual int protocol_id() const = 0;
+};
+
+#endif