/*************************************************************************** * 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 sales@insecure.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 "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, as well as other software we distribute under this * * license such as Zenmap, Ncat, and Nping. 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 sales@insecure.com 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. 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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 /* 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