/*************************************************************************** * 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) 1996-2011 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). 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See the GNU * * General Public License v2.0 for more details at * * http://www.gnu.org/licenses/gpl-2.0.html , or in the COPYING file * * included with Nmap. * * * ***************************************************************************/ #ifndef IPV4HEADER_H #define IPV4HEADER_H 1 #include "NetworkLayerElement.h" #define DEFAULT_IP_TTL 64 /* Default IP Time to Live */ #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 */ class IPv4Header : public NetworkLayerElement { private: 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(); void zero(); u8 *getBufferPointer(); int storeRecvData(const u8 *buf, size_t len); int validate(); /* IP version */ int setVersion(); u8 getVersion(); /* Header Length */ int setHeaderLength(); int setHeaderLength(u8 l); u8 getHeaderLength(); /* Type of Service */ int setTOS(u8 v); u8 getTOS(); /* Total lenght of the datagram */ int setTotalLength(); int setTotalLength(u16 l); u16 getTotalLength(); /* Identification value */ int setIdentification(); int setIdentification(u16 i); u16 getIdentification(); /* Fragment Offset */ int setFragOffset(); int setFragOffset(u16 f); u16 getFragOffset(); /* Flags */ int setRF(); int unsetRF(); bool getRF(); int setDF(); int unsetDF(); bool getDF(); int setMF(); int unsetMF(); bool getMF(); /* Time to live */ int setTTL(); int setTTL(u8 t); u8 getTTL(); /* Next protocol */ int setNextProto(u8 p); int setNextProto(const char *p); u8 getNextProto(); /* Checksum */ int setSum(); int setSum(u16 s); int setSumRandom(); u16 getSum(); /* Destination IP */ int setDstIP(u32 d); int setDstIP(struct in_addr d); struct in_addr getDstIP(); /* Source IP */ int setSrcIP(u32 d); int setSrcIP(struct in_addr d); struct in_addr getSrcIP(); /* IP Options */ int setOpts(const char *txt); u8 *getOpts(); u8 *getOpts(int *len); int printOptions(); char *getOptionsString(); }; /* End of class IPv4Header */ #endif