/*************************************************************************** * 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) 1996-2016 Insecure.Com LLC ("The Nmap * * Project"). Nmap is also a registered trademark of the Nmap Project. * * 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 ("GPL"), BUT ONLY WITH ALL OF THE * * CLARIFICATIONS AND EXCEPTIONS DESCRIBED HEREIN. 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@nmap.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 "derivative 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 with any software or content covered by this license * * ("Covered Software"): * * * * o Integrates source code from Covered Software. * * * * o Reads or includes copyrighted data files, such as Nmap's nmap-os-db * * or nmap-service-probes. * * * * o Is designed specifically to execute Covered Software and parse the * * results (as opposed to typical shell or execution-menu apps, which will * * execute anything you tell them to). * * * * o Includes Covered Software in a proprietary executable installer. The * * installers produced by InstallShield are an example of this. Including * * Nmap with other software in compressed or archival form does not * * trigger this provision, provided appropriate open source decompression * * or de-archiving software is widely available for no charge. For the * * purposes of this license, an installer is considered to include Covered * * Software even if it actually retrieves a copy of Covered Software from * * another source during runtime (such as by downloading it from the * * Internet). * * * * o Links (statically or dynamically) to a library which does any of the * * above. * * * * o Executes a helper program, module, or script to do any of the above. * * * * This list is not exclusive, but is meant to clarify our interpretation * * of derived works with some common examples. Other people may interpret * * the plain GPL differently, so we consider this a special exception to * * the GPL that we apply to Covered Software. Works which meet any of * * these conditions must conform to all of the terms of this license, * * particularly including the GPL Section 3 requirements of providing * * source code and allowing free redistribution of the work as a whole. * * * * As another special exception to the GPL terms, the Nmap Project 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. * * * * The Nmap Project has permission to redistribute Npcap, a packet * * capturing driver and library for the Microsoft Windows platform. * * Npcap is a separate work with it's own license rather than this Nmap * * license. Since the Npcap license does not permit redistribution * * without special permission, our Nmap Windows binary packages which * * contain Npcap may not be redistributed without special permission. * * * * Any redistribution of Covered Software, including any derived works, * * must obey and carry forward all of the terms of this license, including * * obeying all GPL rules and restrictions. For example, source code of * * the whole work must be provided and free redistribution must be * * allowed. All GPL references to "this License", are to be treated as * * including the terms and conditions of this license text as well. * * * * Because this license imposes special exceptions to the GPL, Covered * * Work may not be combined (even as part of a larger work) with plain GPL * * software. The terms, conditions, and exceptions of this license must * * be included as well. This license is incompatible with some other open * * source licenses as well. In some cases we can relicense portions of * * Nmap or grant special permissions to use it in other open source * * software. Please contact fyodor@nmap.org with any such requests. * * Similarly, we don't incorporate incompatible open source software into * * Covered Software without special permission from the copyright holders. * * * * If you have any questions about the licensing restrictions on using * * Nmap in other works, are 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@nmap.com for further * * information. * * * * If you have received a written license agreement or contract for * * Covered Software stating terms other than these, you may choose to use * * and redistribute Covered Software under those terms instead of these. * * * * Source is provided to this software because we believe users have a * * right to know exactly what a program is going to do before they run it. * * This also allows you to audit the software for security holes. * * * * Source code also allows you to port Nmap to new platforms, fix bugs, * * and add new features. You are highly encouraged to send your changes * * to the dev@nmap.org mailing list for possible incorporation into the * * main distribution. 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 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 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 __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__ */