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253 lines
12 KiB
C++
253 lines
12 KiB
C++
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/***************************************************************************
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* IPv4Header.h -- The IPv4Header Class represents an IPv4 datagram. It *
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* contains methods to set any header field. In general, these methods do *
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* error checkings and byte order conversion. *
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* *
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***********************IMPORTANT NMAP LICENSE TERMS************************
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* *
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* The Nmap Security Scanner is (C) 1996-2012 Insecure.Com LLC. Nmap is *
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* also a registered trademark of Insecure.Com LLC. This program is free *
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* software; you may redistribute and/or modify it under the terms of the *
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* GNU General Public License as published by the Free Software *
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* Foundation; Version 2 with the clarifications and exceptions described *
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* below. This guarantees your right to use, modify, and redistribute *
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* this software under certain conditions. If you wish to embed Nmap *
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* technology into proprietary software, we sell alternative licenses *
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* (contact sales@insecure.com). Dozens of software vendors already *
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* license Nmap technology such as host discovery, port scanning, OS *
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* detection, version detection, and the Nmap Scripting Engine. *
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* *
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* Note that the GPL places important restrictions on "derived works", yet *
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* it does not provide a detailed definition of that term. To avoid *
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* misunderstandings, we interpret that term as broadly as copyright law *
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* allows. For example, we consider an application to constitute a *
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* "derivative work" for the purpose of this license if it does any of the *
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* following: *
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* o Integrates source code from Nmap *
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* o Reads or includes Nmap copyrighted data files, such as *
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* nmap-os-db or nmap-service-probes. *
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* o Executes Nmap and parses the results (as opposed to typical shell or *
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* execution-menu apps, which simply display raw Nmap output and so are *
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* not derivative works.) *
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* o Integrates/includes/aggregates Nmap into a proprietary executable *
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* installer, such as those produced by InstallShield. *
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* o Links to a library or executes a program that does any of the above *
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* *
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* The term "Nmap" should be taken to also include any portions or derived *
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* works of Nmap, as well as other software we distribute under this *
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* license such as Zenmap, Ncat, and Nping. This list is not exclusive, *
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* but is meant to clarify our interpretation of derived works with some *
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* common examples. Our interpretation applies only to Nmap--we don't *
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* speak for other people's GPL works. *
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* *
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* If you have any questions about the GPL licensing restrictions on using *
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* Nmap in non-GPL works, we would be happy to help. As mentioned above, *
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* we also offer alternative license to integrate Nmap into proprietary *
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* applications and appliances. These contracts have been sold to dozens *
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* of software vendors, and generally include a perpetual license as well *
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* as providing for priority support and updates. They also fund the *
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* continued development of Nmap. Please email sales@insecure.com for *
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* further information. *
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* *
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* As a special exception to the GPL terms, Insecure.Com LLC grants *
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* permission to link the code of this program with any version of the *
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* OpenSSL library which is distributed under a license identical to that *
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* listed in the included docs/licenses/OpenSSL.txt file, and distribute *
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* linked combinations including the two. You must obey the GNU GPL in all *
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* respects for all of the code used other than OpenSSL. If you modify *
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* this file, you may extend this exception to your version of the file, *
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* but you are not obligated to do so. *
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* *
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* If you received these files with a written license agreement or *
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* contract stating terms other than the terms above, then that *
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* alternative license agreement takes precedence over these comments. *
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* *
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* Source is provided to this software because we believe users have a *
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* right to know exactly what a program is going to do before they run it. *
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* This also allows you to audit the software for security holes (none *
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* have been found so far). *
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* *
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* Source code also allows you to port Nmap to new platforms, fix bugs, *
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* and add new features. You are highly encouraged to send your changes *
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* to the dev@nmap.org mailing list for possible incorporation into the *
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* main distribution. By sending these changes to Fyodor or one of the *
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* Insecure.Org development mailing lists, or checking them into the Nmap *
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* source code repository, it is understood (unless you specify otherwise) *
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* that you are offering the Nmap Project (Insecure.Com LLC) the *
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* unlimited, non-exclusive right to reuse, modify, and relicense the *
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* code. Nmap will always be available Open Source, but this is important *
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* because the inability to relicense code has caused devastating problems *
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* for other Free Software projects (such as KDE and NASM). We also *
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* occasionally relicense the code to third parties as discussed above. *
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* If you wish to specify special license conditions of your *
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* contributions, just say so when you send them. *
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* *
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* This program is distributed in the hope that it will be useful, but *
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* WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the Nmap *
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* license file for more details (it's in a COPYING file included with *
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* Nmap, and also available from https://svn.nmap.org/nmap/COPYING *
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* *
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***************************************************************************/
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/* This code was originally part of the Nping tool. */
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#ifndef IPV4HEADER_H
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#define IPV4HEADER_H 1
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#include "NetworkLayerElement.h"
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#define IP_RF 0x8000 /* Reserved fragment flag */
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#define IP_DF 0x4000 /* Dont fragment flag */
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#define IP_MF 0x2000 /* More fragments flag */
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#define IP_OFFMASK 0x1fff /* Mask for fragmenting bits */
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#define IP_HEADER_LEN 20 /* Length of the standard header */
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#define MAX_IP_OPTIONS_LEN 40 /* Max Length for IP Options */
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/* Default header values */
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#define IPv4_DEFAULT_TOS 0
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#define IPv4_DEFAULT_ID 0
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#define IPv4_DEFAULT_TTL 64
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#define IPv4_DEFAULT_PROTO 6 /* TCP */
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class IPv4Header : public NetworkLayerElement {
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private:
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/*
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0 1 2 3
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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
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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|Version| IHL |Type of Service| Total Length |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Identification |Flags| Fragment Offset |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Time to Live | Protocol | Header Checksum |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Source Address |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Destination Address |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Options | Padding |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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struct nping_ipv4_hdr {
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#if WORDS_BIGENDIAN
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u8 ip_v:4; /* Version */
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u8 ip_hl:4; /* Header length */
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#else
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u8 ip_hl:4; /* Header length */
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u8 ip_v:4; /* Version */
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#endif
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u8 ip_tos; /* Type of service */
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u16 ip_len; /* Total length */
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u16 ip_id; /* Identification */
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u16 ip_off; /* Fragment offset field */
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u8 ip_ttl; /* Time to live */
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u8 ip_p; /* Protocol */
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u16 ip_sum; /* Checksum */
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struct in_addr ip_src; /* Source IP address */
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struct in_addr ip_dst; /* Destination IP address */
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u8 options[MAX_IP_OPTIONS_LEN]; /* IP Options */
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}__attribute__((__packed__));
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typedef struct nping_ipv4_hdr nping_ipv4_hdr_t;
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nping_ipv4_hdr_t h;
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int ipoptlen; /**< Length of IP options */
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public:
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/* Misc */
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IPv4Header();
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~IPv4Header();
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void reset();
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u8 *getBufferPointer();
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int storeRecvData(const u8 *buf, size_t len);
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int protocol_id() const;
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int validate();
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int print(FILE *output, int detail) const;
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/* IP version */
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int setVersion();
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u8 getVersion() const;
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/* Header Length */
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int setHeaderLength();
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int setHeaderLength(u8 l);
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u8 getHeaderLength() const;
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/* Type of Service */
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int setTOS(u8 v);
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u8 getTOS() const;
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/* Total lenght of the datagram */
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int setTotalLength();
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int setTotalLength(u16 l);
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u16 getTotalLength() const;
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/* Identification value */
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int setIdentification();
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int setIdentification(u16 i);
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u16 getIdentification() const;
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/* Fragment Offset */
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int setFragOffset();
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int setFragOffset(u16 f);
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u16 getFragOffset() const;
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/* Flags */
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int setRF();
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int unsetRF();
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bool getRF() const;
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int setDF();
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int unsetDF();
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bool getDF() const;
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int setMF();
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int unsetMF();
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bool getMF() const;
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/* Time to live */
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int setTTL();
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int setTTL(u8 t);
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u8 getTTL() const;
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/* Next protocol */
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int setNextProto(u8 p);
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int setNextProto(const char *p);
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u8 getNextProto() const;
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int setNextHeader(u8 val);
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u8 getNextHeader() const;
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/* Checksum */
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int setSum();
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int setSum(u16 s);
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int setSumRandom();
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u16 getSum() const;
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/* Destination IP */
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int setDestinationAddress(u32 d);
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int setDestinationAddress(struct in_addr d);
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const u8 *getDestinationAddress() const;
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struct in_addr getDestinationAddress(struct in_addr *result) const;
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/* Source IP */
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int setSourceAddress(u32 d);
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int setSourceAddress(struct in_addr d);
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const u8 *getSourceAddress() const;
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struct in_addr getSourceAddress(struct in_addr *result) const;
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u16 getAddressLength() const;
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/* IP Options */
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int setOpts(const char *txt);
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const u8 *getOpts() const;
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const u8 *getOpts(int *len) const;
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int printOptions() const;
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const char *getOptionsString() const;
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}; /* End of class IPv4Header */
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#endif
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