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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) 1996-2019 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 [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 "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 [email protected] 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, we are happy to help. As mentioned above, we also *
* offer an 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 support and updates. They also fund the continued *
* development of Nmap. Please email [email protected] 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 [email protected] 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. */
#ifndef IPV4HEADER_H
#define IPV4HEADER_H 1
#include "NetworkLayerElement.h"
#define IP_RF 0x8000 /* Reserved fragment flag */
#define IP_DF 0x4000 /* Don't 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 length 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);
int setOpts(u8 *opts_buff, u32 opts_len);
const u8 *getOpts() const;
const u8 *getOpts(int *len) const;
int printOptions() const;
const char *getOptionsString() const;
}; /* End of class IPv4Header */
#endif