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293 lines
14 KiB
C++
293 lines
14 KiB
C++
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/***************************************************************************
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* TCPHeader.h -- The TCPHeader Class represents a TCP packet. It contains *
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* methods to set the different header fields. These methods tipically *
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* perform the necessary error checks and byte order conversions. *
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* *
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***********************IMPORTANT NMAP LICENSE TERMS************************
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* *
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* The Nmap Security Scanner is (C) 1996-2012 Insecure.Com LLC. Nmap is *
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* also a registered trademark of Insecure.Com LLC. This program is free *
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* software; you may redistribute and/or modify it under the terms of the *
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* GNU General Public License as published by the Free Software *
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* Foundation; Version 2 with the clarifications and exceptions described *
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* below. This guarantees your right to use, modify, and redistribute *
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* this software under certain conditions. If you wish to embed Nmap *
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* technology into proprietary software, we sell alternative licenses *
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* (contact sales@insecure.com). Dozens of software vendors already *
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* license Nmap technology such as host discovery, port scanning, OS *
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* detection, version detection, and the Nmap Scripting Engine. *
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* *
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* Note that the GPL places important restrictions on "derived works", yet *
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* it does not provide a detailed definition of that term. To avoid *
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* misunderstandings, we interpret that term as broadly as copyright law *
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* allows. For example, we consider an application to constitute a *
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* "derivative work" for the purpose of this license if it does any of the *
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* following: *
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* o Integrates source code from Nmap *
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* o Reads or includes Nmap copyrighted data files, such as *
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* nmap-os-db or nmap-service-probes. *
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* o Executes Nmap and parses the results (as opposed to typical shell or *
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* execution-menu apps, which simply display raw Nmap output and so are *
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* not derivative works.) *
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* o Integrates/includes/aggregates Nmap into a proprietary executable *
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* installer, such as those produced by InstallShield. *
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* o Links to a library or executes a program that does any of the above *
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* *
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* The term "Nmap" should be taken to also include any portions or derived *
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* works of Nmap, as well as other software we distribute under this *
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* license such as Zenmap, Ncat, and Nping. This list is not exclusive, *
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* but is meant to clarify our interpretation of derived works with some *
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* common examples. Our interpretation applies only to Nmap--we don't *
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* speak for other people's GPL works. *
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* *
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* If you have any questions about the GPL licensing restrictions on using *
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* Nmap in non-GPL works, we would be happy to help. As mentioned above, *
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* we also offer alternative license to integrate Nmap into proprietary *
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* applications and appliances. These contracts have been sold to dozens *
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* of software vendors, and generally include a perpetual license as well *
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* as providing for priority support and updates. They also fund the *
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* continued development of Nmap. Please email sales@insecure.com for *
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* further information. *
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* *
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* As a special exception to the GPL terms, Insecure.Com LLC grants *
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* permission to link the code of this program with any version of the *
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* OpenSSL library which is distributed under a license identical to that *
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* listed in the included docs/licenses/OpenSSL.txt file, and distribute *
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* linked combinations including the two. You must obey the GNU GPL in all *
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* respects for all of the code used other than OpenSSL. If you modify *
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* this file, you may extend this exception to your version of the file, *
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* but you are not obligated to do so. *
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* *
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* If you received these files with a written license agreement or *
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* contract stating terms other than the terms above, then that *
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* alternative license agreement takes precedence over these comments. *
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* *
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* Source is provided to this software because we believe users have a *
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* right to know exactly what a program is going to do before they run it. *
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* This also allows you to audit the software for security holes (none *
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* have been found so far). *
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* *
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* Source code also allows you to port Nmap to new platforms, fix bugs, *
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* and add new features. You are highly encouraged to send your changes *
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* to the dev@nmap.org mailing list for possible incorporation into the *
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* main distribution. By sending these changes to Fyodor or one of the *
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* Insecure.Org development mailing lists, or checking them into the Nmap *
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* source code repository, it is understood (unless you specify otherwise) *
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* that you are offering the Nmap Project (Insecure.Com LLC) the *
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* unlimited, non-exclusive right to reuse, modify, and relicense the *
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* code. Nmap will always be available Open Source, but this is important *
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* because the inability to relicense code has caused devastating problems *
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* for other Free Software projects (such as KDE and NASM). We also *
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* occasionally relicense the code to third parties as discussed above. *
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* If you wish to specify special license conditions of your *
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* contributions, just say so when you send them. *
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* *
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* This program is distributed in the hope that it will be useful, but *
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* WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the Nmap *
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* license file for more details (it's in a COPYING file included with *
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* Nmap, and also available from https://svn.nmap.org/nmap/COPYING *
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* *
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***************************************************************************/
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/* This code was originally part of the Nping tool. */
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#ifndef __TCPHEADER_H__
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#define __TCPHEADER_H__ 1
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#include "TransportLayerElement.h"
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/* TCP FLAGS */
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#define TH_FIN 0x01
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#define TH_SYN 0x02
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#define TH_RST 0x04
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#define TH_PSH 0x08
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#define TH_ACK 0x10
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#define TH_URG 0x20
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#define TH_ECN 0x40
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#define TH_CWR 0x80
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/* TCP OPTIONS */
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#define TCPOPT_EOL 0 /* End of Option List (RFC793) */
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#define TCPOPT_NOOP 1 /* No-Operation (RFC793) */
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#define TCPOPT_MSS 2 /* Maximum Segment Size (RFC793) */
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#define TCPOPT_WSCALE 3 /* WSOPT - Window Scale (RFC1323) */
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#define TCPOPT_SACKOK 4 /* SACK Permitted (RFC2018) */
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#define TCPOPT_SACK 5 /* SACK (RFC2018) */
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#define TCPOPT_ECHOREQ 6 /* Echo (obsolete) (RFC1072)(RFC6247) */
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#define TCPOPT_ECHOREP 7 /* Echo Reply (obsolete) (RFC1072)(RFC6247) */
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#define TCPOPT_TSTAMP 8 /* TSOPT - Time Stamp Option (RFC1323) */
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#define TCPOPT_POCP 9 /* Partial Order Connection Permitted (obsol.) */
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#define TCPOPT_POSP 10 /* Partial Order Service Profile (obsolete) */
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#define TCPOPT_CC 11 /* CC (obsolete) (RFC1644)(RFC6247) */
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#define TCPOPT_CCNEW 12 /* CC.NEW (obsolete) (RFC1644)(RFC6247) */
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#define TCPOPT_CCECHO 13 /* CC.ECHO (obsolete) (RFC1644)(RFC6247) */
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#define TCPOPT_ALTCSUMREQ 14 /* TCP Alternate Checksum Request (obsolete) */
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#define TCPOPT_ALTCSUMDATA 15 /* TCP Alternate Checksum Data (obsolete) */
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#define TCPOPT_MD5 19 /* MD5 Signature Option (obsolete) (RFC2385) */
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#define TCPOPT_SCPS 20 /* SCPS Capabilities */
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#define TCPOPT_SNACK 21 /* Selective Negative Acknowledgements */
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#define TCPOPT_QSRES 27 /* Quick-Start Response (RFC4782) */
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#define TCPOPT_UTO 28 /* User Timeout Option (RFC5482) */
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#define TCPOPT_AO 29 /* TCP Authentication Option (RFC5925) */
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/* Internal constants */
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#define TCP_HEADER_LEN 20
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#define MAX_TCP_OPTIONS_LEN 40
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#define MAX_TCP_PAYLOAD_LEN 65495 /**< Max len of a TCP packet */
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/* Default header values */
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#define TCP_DEFAULT_SPORT 20
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#define TCP_DEFAULT_DPORT 80
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#define TCP_DEFAULT_SEQ 0
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#define TCP_DEFAULT_ACK 0
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#define TCP_DEFAULT_FLAGS 0x02
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#define TCP_DEFAULT_WIN 8192
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#define TCP_DEFAULT_URP 0
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/*
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+--------+--------+---------+--------...
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| Type | Len | Value
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+--------+--------+---------+--------...
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*/
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struct nping_tcp_opt {
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u8 type; /* Option type code. */
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u8 len; /* Option length. */
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u8 *value; /* Option value */
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}__attribute__((__packed__));
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typedef struct nping_tcp_opt nping_tcp_opt_t;
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class TCPHeader : public TransportLayerElement {
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private:
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/*
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0 1 2 3
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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
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Source Port | Destination Port |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Sequence Number |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Acknowledgment Number |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Offset| Res. |C|E|U|A|P|R|S|F| Window |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Checksum | Urgent Pointer |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Options | Padding |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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struct nping_tcp_hdr {
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u16 th_sport; /* Source port */
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u16 th_dport; /* Destination port */
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u32 th_seq; /* Sequence number */
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u32 th_ack; /* Acknowledgement number */
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#if WORDS_BIGENDIAN
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u8 th_off:4; /* Data offset */
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u8 th_x2:4; /* Reserved */
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#else
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u8 th_x2:4; /* Reserved */
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u8 th_off:4; /* Data offset */
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#endif
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u8 th_flags; /* Flags */
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u16 th_win; /* Window size */
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u16 th_sum; /* Checksum */
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u16 th_urp; /* Urgent pointer */
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u8 options[MAX_TCP_OPTIONS_LEN ]; /* Space for TCP Options */
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}__attribute__((__packed__));
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typedef struct nping_tcp_hdr nping_tcp_hdr_t;
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nping_tcp_hdr_t h;
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int tcpoptlen; /**< Length of TCP options */
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void __tcppacketoptinfo(const u8 *optp, int len, char *result, int bufsize) const;
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public:
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TCPHeader();
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~TCPHeader();
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void reset();
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u8 *getBufferPointer();
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int storeRecvData(const u8 *buf, size_t len);
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int protocol_id() const;
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int validate();
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int print(FILE *output, int detail) const;
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int setSourcePort(u16 p);
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u16 getSourcePort() const;
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int setDestinationPort(u16 p);
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u16 getDestinationPort() const;
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int setSeq(u32 p);
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u32 getSeq() const;
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int setAck(u32 p);
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u32 getAck() const;
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int setOffset(u8 o);
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int setOffset();
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u8 getOffset() const;
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int setReserved(u8 r);
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u8 getReserved() const;
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int setFlags(u8 f);
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u8 getFlags() const;
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u16 getFlags16() const;
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bool setCWR();
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bool unsetCWR();
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bool getCWR() const;
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bool setECE();
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bool unsetECE();
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bool getECE() const;
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bool setECN();
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bool unsetECN();
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bool getECN() const;
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bool setURG();
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bool unsetURG();
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bool getURG() const;
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bool setACK();
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bool unsetACK();
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bool getACK() const;
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bool setPSH();
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bool unsetPSH();
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bool getPSH() const;
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bool setRST();
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bool unsetRST();
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bool getRST() const;
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bool setSYN();
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bool unsetSYN();
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bool getSYN() const;
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bool setFIN();
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bool unsetFIN();
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bool getFIN() const;
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int setWindow(u16 p);
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u16 getWindow() const;
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int setUrgPointer(u16 l);
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u16 getUrgPointer() const;
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int setSum(u16 s);
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int setSum(struct in_addr source, struct in_addr destination);
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int setSum();
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int setSumRandom();
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int setSumRandom(struct in_addr source, struct in_addr destination);
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u16 getSum() const;
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int setOptions(const u8 *optsbuff, size_t optslen);
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const u8 *getOptions(size_t *optslen) const;
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nping_tcp_opt_t getOption(unsigned int index) const;
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static const char *optcode2str(u8 optcode);
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}; /* End of class TCPHeader */
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#endif /* __TCPHEADER_H__ */
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