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nmap/libnetutil/TCPHeader.h
dmiller d639a53088 Bump copyright date in license headers
2019-05-28 21:36:04 +00:00

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/***************************************************************************
* 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) 1996-2019 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, we are happy to help. As mentioned above, we also *
* offer an 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 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__ */
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