/*************************************************************************** * 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) 1996-2012 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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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 (Insecure.Com LLC) 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 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. * * * ***************************************************************************/ /* This code was originally part of the Nping tool. */ #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_PSH 0x08 #define TH_ACK 0x10 #define TH_URG 0x20 #define TH_ECN 0x40 #define TH_CWR 0x80 /* TCP OPTIONS */ #define TCPOPT_EOL 0 /* End of Option List (RFC793) */ #define TCPOPT_NOOP 1 /* No-Operation (RFC793) */ #define TCPOPT_MSS 2 /* Maximum Segment Size (RFC793) */ #define TCPOPT_WSCALE 3 /* WSOPT - Window Scale (RFC1323) */ #define TCPOPT_SACKOK 4 /* SACK Permitted (RFC2018) */ #define TCPOPT_SACK 5 /* SACK (RFC2018) */ #define TCPOPT_ECHOREQ 6 /* Echo (obsolete) (RFC1072)(RFC6247) */ #define TCPOPT_ECHOREP 7 /* Echo Reply (obsolete) (RFC1072)(RFC6247) */ #define TCPOPT_TSTAMP 8 /* TSOPT - Time Stamp Option (RFC1323) */ #define TCPOPT_POCP 9 /* Partial Order Connection Permitted (obsol.) */ #define TCPOPT_POSP 10 /* Partial Order Service Profile (obsolete) */ #define TCPOPT_CC 11 /* CC (obsolete) (RFC1644)(RFC6247) */ #define TCPOPT_CCNEW 12 /* CC.NEW (obsolete) (RFC1644)(RFC6247) */ #define TCPOPT_CCECHO 13 /* CC.ECHO (obsolete) (RFC1644)(RFC6247) */ #define TCPOPT_ALTCSUMREQ 14 /* TCP Alternate Checksum Request (obsolete) */ #define TCPOPT_ALTCSUMDATA 15 /* TCP Alternate Checksum Data (obsolete) */ #define TCPOPT_MD5 19 /* MD5 Signature Option (obsolete) (RFC2385) */ #define TCPOPT_SCPS 20 /* SCPS Capabilities */ #define TCPOPT_SNACK 21 /* Selective Negative Acknowledgements */ #define TCPOPT_QSRES 27 /* Quick-Start Response (RFC4782) */ #define TCPOPT_UTO 28 /* User Timeout Option (RFC5482) */ #define TCPOPT_AO 29 /* TCP Authentication Option (RFC5925) */ /* Internal constants */ #define TCP_HEADER_LEN 20 #define MAX_TCP_OPTIONS_LEN 40 #define MAX_TCP_PAYLOAD_LEN 65495 /**< Max len of a TCP packet */ /* Default header values */ #define TCP_DEFAULT_SPORT 20 #define TCP_DEFAULT_DPORT 80 #define TCP_DEFAULT_SEQ 0 #define TCP_DEFAULT_ACK 0 #define TCP_DEFAULT_FLAGS 0x02 #define TCP_DEFAULT_WIN 8192 #define TCP_DEFAULT_URP 0 /* +--------+--------+---------+--------... | Type | Len | Value +--------+--------+---------+--------... */ struct nping_tcp_opt { u8 type; /* Option type code. */ u8 len; /* Option length. */ u8 *value; /* Option value */ }__attribute__((__packed__)); typedef struct nping_tcp_opt nping_tcp_opt_t; class TCPHeader : public TransportLayerElement { 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Source Port | Destination Port | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Sequence Number | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Acknowledgment Number | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Offset| Res. |C|E|U|A|P|R|S|F| Window | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Checksum | Urgent Pointer | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Options | Padding | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */ 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; int tcpoptlen; /**< Length of TCP options */ void __tcppacketoptinfo(const u8 *optp, int len, char *result, int bufsize) const; public: TCPHeader(); ~TCPHeader(); 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; int setSourcePort(u16 p); u16 getSourcePort() const; int setDestinationPort(u16 p); u16 getDestinationPort() const; int setSeq(u32 p); u32 getSeq() const; int setAck(u32 p); u32 getAck() const; int setOffset(u8 o); int setOffset(); u8 getOffset() const; int setReserved(u8 r); u8 getReserved() const; int setFlags(u8 f); u8 getFlags() const; u16 getFlags16() const; bool setCWR(); bool unsetCWR(); bool getCWR() const; bool setECE(); bool unsetECE(); bool getECE() const; bool setECN(); bool unsetECN(); bool getECN() const; bool setURG(); bool unsetURG(); bool getURG() const; bool setACK(); bool unsetACK(); bool getACK() const; bool setPSH(); bool unsetPSH(); bool getPSH() const; bool setRST(); bool unsetRST(); bool getRST() const; bool setSYN(); bool unsetSYN(); bool getSYN() const; bool setFIN(); bool unsetFIN(); bool getFIN() const; int setWindow(u16 p); u16 getWindow() const; int setUrgPointer(u16 l); u16 getUrgPointer() const; int setSum(u16 s); int setSum(struct in_addr source, struct in_addr destination); int setSum(); int setSumRandom(); int setSumRandom(struct in_addr source, struct in_addr destination); u16 getSum() const; int setOptions(const u8 *optsbuff, size_t optslen); const u8 *getOptions(size_t *optslen) const; nping_tcp_opt_t getOption(unsigned int index) const; static const char *optcode2str(u8 optcode); }; /* End of class TCPHeader */ #endif /* __TCPHEADER_H__ */