/*************************************************************************** * TCPHeader.h -- The TCPHeader Class represents a TCP packet. It contains * * methods to set the different header fields. These methods tipically * * perform the necessary error checks and byte order conversions. * * * ***********************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). Dozens of software vendors already * * license Nmap technology such as host discovery, port scanning, OS * * detection, and version detection. * * * * 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 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. 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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 __TCPHEADER_H__ #define __TCPHEADER_H__ 1 #include "TransportLayerElement.h" /* TCP FLAGS */ #define TH_FIN 0x01 #define TH_SYN 0x02 #define TH_RST 0x04 #define TH_PUSH 0x08 #define TH_ACK 0x10 #define TH_URG 0x20 #define TH_ECN 0x40 #define TH_CWR 0x80 #define TCP_HEADER_LEN 20 #define MAX_TCP_OPTIONS_LEN 40 class TCPHeader : public TransportLayerElement { private: struct nping_tcp_hdr { u16 th_sport; /* Source port */ u16 th_dport; /* Destination port */ u32 th_seq; /* Sequence number */ u32 th_ack; /* Acknowledgement number */ #if WORDS_BIGENDIAN u8 th_off:4; /* Data offset */ u8 th_x2:4; /* Reserved */ #else u8 th_x2:4; /* Reserved */ u8 th_off:4; /* Data offset */ #endif u8 th_flags; /* Flags */ u16 th_win; /* Window size */ u16 th_sum; /* Checksum */ u16 th_urp; /* Urgent pointer */ u8 options[MAX_TCP_OPTIONS_LEN ]; /* Space for TCP Options */ }__attribute__((__packed__)); typedef struct nping_tcp_hdr nping_tcp_hdr_t; nping_tcp_hdr_t h; struct tcpopt_hdr { u_char type; /* type */ u_char len; /* length */ u_short value; /* value */ }; int tcpoptlen; /**< Length of TCP options */ public: TCPHeader(); ~TCPHeader(); void reset(); u8 *getBufferPointer(); int storeRecvData(const u8 *buf, size_t len); int validate(); int setSrcPort(u16 p); u16 getSrcPort(); int setDstPort(u16 p); u16 getDstPort(); int setSeq(u32 p); u32 getSeq(); int setAck(u32 p); u32 getAck(); int setOffset(u8 o); int setOffset(); u8 getOffset(); int setFlags(u8 f); u8 getFlags(); bool setCWR(); bool unsetCWR(); bool getCWR(); bool setECE(); bool unsetECE(); bool getECE(); bool setECN(); bool unsetECN(); bool getECN(); bool setURG(); bool unsetURG(); bool getURG(); bool setACK(); bool unsetACK(); bool getACK(); bool setPUSH(); bool unsetPUSH(); bool getPUSH(); bool setRST(); bool unsetRST(); bool getRST(); bool setSYN(); bool unsetSYN(); bool getSYN(); bool setFIN(); bool unsetFIN(); bool getFIN(); int setWindow(u16 p); u16 getWindow(); int setUrgPointer(u16 l); u16 getUrgPointer(); int setSum(u16 s); int setSum(struct in_addr source, struct in_addr destination); int setSumRandom(); int setSumRandom(struct in_addr source, struct in_addr destination); u16 getSum(); }; /* End of class TCPHeader */ #endif /* __TCPHEADER_H__ */