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IPv4Header.h
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IPv4Header.h
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/***************************************************************************
* IPv4Header.h -- The IPv4Header 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) 1996-2012 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 [email protected]). 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 *
* 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: *
* o Integrates source code from Nmap *
* o Reads or includes Nmap copyrighted data files, such as *
* nmap-os-db or nmap-service-probes. *
* o Executes Nmap and parses the results (as opposed to typical shell or *
* execution-menu apps, which simply display raw Nmap output and so are *
* 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 *
* works of Nmap. This list is not exclusive, but is meant to clarify our *
* interpretation of derived works with some common examples. Our *
* interpretation applies only to Nmap--we don't speak for other people's *
* GPL works. *
* *
* If you have any questions about the GPL licensing restrictions on using *
* Nmap in non-GPL works, we would be 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 [email protected] for *
* further information. *
* *
* As a special exception to the GPL terms, Insecure.Com LLC 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. You must obey the GNU GPL in all *
* respects for all of the code used other than OpenSSL. If you modify *
* this file, you may extend this exception to your version of the file, *
* but you are not obligated to do so. *
* *
* If you received these files with a written license agreement or *
* contract stating terms other than the terms above, then that *
* alternative license agreement takes precedence over these comments. *
* *
* 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 (none *
* have been found so far). *
* *
* 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 [email protected] for possible incorporation into the main *
* distribution. By sending these changes to Fyodor or one of the *
* Insecure.Org development mailing lists, it is assumed that you are *
* offering the Nmap Project (Insecure.Com LLC) 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 GNU *
* General Public License v2.0 for more details at *
* https://www.gnu.org/licenses/gpl-2.0.html , or in the COPYING file *
* included with Nmap. *
* *
***************************************************************************/
/* This code was originally part of the Nping tool. */
#ifndef IPV4HEADER_H
#define IPV4HEADER_H 1
#include "NetworkLayerElement.h"
#define IP_RF 0x8000 /* Reserved fragment flag */
#define IP_DF 0x4000 /* Dont fragment flag */
#define IP_MF 0x2000 /* More fragments flag */
#define IP_OFFMASK 0x1fff /* Mask for fragmenting bits */
#define IP_HEADER_LEN 20 /* Length of the standard header */
#define MAX_IP_OPTIONS_LEN 40 /* Max Length for IP Options */
/* Default header values */
#define IPv4_DEFAULT_TOS 0
#define IPv4_DEFAULT_ID 0
#define IPv4_DEFAULT_TTL 64
#define IPv4_DEFAULT_PROTO 6 /* TCP */
class IPv4Header : public NetworkLayerElement {
private:
/*
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|Version| IHL |Type of Service| Total Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Identification |Flags| Fragment Offset |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Time to Live | Protocol | Header Checksum |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Source Address |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Destination Address |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Options | Padding |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
struct nping_ipv4_hdr {
#if WORDS_BIGENDIAN
u8 ip_v:4; /* Version */
u8 ip_hl:4; /* Header length */
#else
u8 ip_hl:4; /* Header length */
u8 ip_v:4; /* Version */
#endif
u8 ip_tos; /* Type of service */
u16 ip_len; /* Total length */
u16 ip_id; /* Identification */
u16 ip_off; /* Fragment offset field */
u8 ip_ttl; /* Time to live */
u8 ip_p; /* Protocol */
u16 ip_sum; /* Checksum */
struct in_addr ip_src; /* Source IP address */
struct in_addr ip_dst; /* Destination IP address */
u8 options[MAX_IP_OPTIONS_LEN]; /* IP Options */
}__attribute__((__packed__));
typedef struct nping_ipv4_hdr nping_ipv4_hdr_t;
nping_ipv4_hdr_t h;
int ipoptlen; /**< Length of IP options */
public:
/* Misc */
IPv4Header();
~IPv4Header();
void reset();
u8 *getBufferPointer();
int storeRecvData(const u8 *buf, size_t len);
int protocol_id() const;
int validate();
int print(FILE *output, int detail) const;
/* IP version */
int setVersion();
u8 getVersion() const;
/* Header Length */
int setHeaderLength();
int setHeaderLength(u8 l);
u8 getHeaderLength() const;
/* Type of Service */
int setTOS(u8 v);
u8 getTOS() const;
/* Total lenght of the datagram */
int setTotalLength();
int setTotalLength(u16 l);
u16 getTotalLength() const;
/* Identification value */
int setIdentification();
int setIdentification(u16 i);
u16 getIdentification() const;
/* Fragment Offset */
int setFragOffset();
int setFragOffset(u16 f);
u16 getFragOffset() const;
/* Flags */
int setRF();
int unsetRF();
bool getRF() const;
int setDF();
int unsetDF();
bool getDF() const;
int setMF();
int unsetMF();
bool getMF() const;
/* Time to live */
int setTTL();
int setTTL(u8 t);
u8 getTTL() const;
/* Next protocol */
int setNextProto(u8 p);
int setNextProto(const char *p);
u8 getNextProto() const;
int setNextHeader(u8 val);
u8 getNextHeader() const;
/* Checksum */
int setSum();
int setSum(u16 s);
int setSumRandom();
u16 getSum() const;
/* Destination IP */
int setDestinationAddress(u32 d);
int setDestinationAddress(struct in_addr d);
const u8 *getDestinationAddress() const;
struct in_addr getDestinationAddress(struct in_addr *result) const;
/* Source IP */
int setSourceAddress(u32 d);
int setSourceAddress(struct in_addr d);
const u8 *getSourceAddress() const;
struct in_addr getSourceAddress(struct in_addr *result) const;
u16 getAddressLength() const;
/* IP Options */
int setOpts(const char *txt);
const u8 *getOpts() const;
const u8 *getOpts(int *len) const;
int printOptions() const;
const char *getOptionsString() const;
}; /* End of class IPv4Header */
#endif