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Diffstat (limited to 'libnetutil/HopByHopHeader.h')
| -rw-r--r-- | libnetutil/HopByHopHeader.h | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/libnetutil/HopByHopHeader.h b/libnetutil/HopByHopHeader.h new file mode 100644 index 0000000..9fdfd45 --- /dev/null +++ b/libnetutil/HopByHopHeader.h @@ -0,0 +1,122 @@ +/*************************************************************************** + * HopByHopHeader.h -- The HopByHopHeader Class represents an IPv6 * + * Hop-by-Hop extension header. * + ***********************IMPORTANT NMAP LICENSE TERMS************************ + * + * The Nmap Security Scanner is (C) 1996-2023 Nmap Software LLC ("The Nmap + * Project"). Nmap is also a registered trademark of the Nmap Project. + * + * This program is distributed under the terms of the Nmap Public Source + * License (NPSL). The exact license text applying to a particular Nmap + * release or source code control revision is contained in the LICENSE + * file distributed with that version of Nmap or source code control + * revision. More Nmap copyright/legal information is available from + * https://nmap.org/book/man-legal.html, and further information on the + * NPSL license itself can be found at https://nmap.org/npsl/ . This + * header summarizes some key points from the Nmap license, but is no + * substitute for the actual license text. + * + * Nmap is generally free for end users to download and use themselves, + * including commercial use. It is available from https://nmap.org. + * + * The Nmap license generally prohibits companies from using and + * redistributing Nmap in commercial products, but we sell a special Nmap + * OEM Edition with a more permissive license and special features for + * this purpose. See https://nmap.org/oem/ + * + * If you have received a written Nmap license agreement or contract + * stating terms other than these (such as an Nmap OEM license), you may + * choose to use and redistribute Nmap under those terms instead. + * + * The official Nmap Windows builds include the Npcap software + * (https://npcap.com) for packet capture and transmission. It is under + * separate license terms which forbid redistribution without special + * permission. So the official Nmap Windows builds may not be redistributed + * without special permission (such as an Nmap OEM license). + * + * 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 submit your changes as a Github PR + * or by email to the dev@nmap.org mailing list for possible incorporation into + * the main distribution. Unless you specify otherwise, it is understood that + * you are offering us very broad rights to use your submissions as described in + * the Nmap Public Source License Contributor Agreement. This is important + * because we fund the project by selling licenses with various terms, and also + * because the inability to relicense code has caused devastating problems for + * other Free Software projects (such as KDE and NASM). + * + * The free version of Nmap 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. Warranties, + * indemnification and commercial support are all available through the + * Npcap OEM program--see https://nmap.org/oem/ + * + ***************************************************************************/ +/* This code was originally part of the Nping tool. */ + +#ifndef __HOP_BY_HOP_HEADER_H__ +#define __HOP_BY_HOP_HEADER_H__ 1 + +#include "IPv6ExtensionHeader.h" + +#define HOP_BY_HOP_MAX_OPTIONS_LEN 256*8 +#define HOPBYHOP_MIN_HEADER_LEN 8 +#define HOPBYHOP_MAX_HEADER_LEN (HOPBYHOP_MIN_HEADER_LEN + HOP_BY_HOP_MAX_OPTIONS_LEN) +#define HOPBYHOP_MAX_OPTION_LEN 256 + +class HopByHopHeader : public IPv6ExtensionHeader { + + protected: + /* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | Next Header | Hdr Ext Len | | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + + | | + . . + . Options . + . . + | | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */ + struct nping_ipv6_ext_hopbyhop_hdr{ + u8 nh; + u8 len; + u8 options[HOP_BY_HOP_MAX_OPTIONS_LEN]; + }__attribute__((__packed__)); + typedef struct nping_ipv6_ext_hopbyhop_hdr nping_ipv6_ext_hopbyhop_hdr_t; + + + /* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- - - - - - - - - + | Option Type | Opt Data Len | Option Data + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- - - - - - - - - */ + struct nping_ipv6_ext_hopbyhop_opt{ + u8 type; + u8 len; + u8 data[HOPBYHOP_MAX_OPTION_LEN]; + }__attribute__((__packed__)); + typedef struct nping_ipv6_ext_hopbyhop_opt nping_ipv6_ext_hopbyhop_opt_t; + + nping_ipv6_ext_hopbyhop_hdr_t h; + u8 *curr_option; + + public: + HopByHopHeader(); + ~HopByHopHeader(); + 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; + + /* Protocol specific methods */ + int setNextHeader(u8 val); + u8 getNextHeader(); + + int addOption(u8 type, u8 len, const u8 *data); + int addPadding(); + +}; /* End of class HopByHopHeader */ + +#endif |