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Diffstat (limited to 'libnetutil/IPv4Header.h')
| -rw-r--r-- | libnetutil/IPv4Header.h | 220 |
1 files changed, 220 insertions, 0 deletions
diff --git a/libnetutil/IPv4Header.h b/libnetutil/IPv4Header.h new file mode 100644 index 0000000..5541000 --- /dev/null +++ b/libnetutil/IPv4Header.h @@ -0,0 +1,220 @@ +/*************************************************************************** + * IPv4Header.h -- The IPv4Header Class represents an IPv4 datagram. It * + * contains methods to set any header field. In general, these methods do * + * error checkings and byte order conversion. * + * * + ***********************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 IPV4HEADER_H +#define IPV4HEADER_H 1 + +#include "NetworkLayerElement.h" + +#define IP_RF 0x8000 /* Reserved fragment flag */ +#define IP_DF 0x4000 /* Don't fragment flag */ +#define IP_MF 0x2000 /* More fragments flag */ +#define IP_OFFMASK 0x1fff /* Mask for fragmenting bits */ +#define IP_HEADER_LEN 20 /* Length of the standard header */ +#define MAX_IP_OPTIONS_LEN 40 /* Max Length for IP Options */ + +/* Default header values */ +#define IPv4_DEFAULT_TOS 0 +#define IPv4_DEFAULT_ID 0 +#define IPv4_DEFAULT_TTL 64 +#define IPv4_DEFAULT_PROTO 6 /* TCP */ + +class IPv4Header : public NetworkLayerElement { + + 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 + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + |Version| IHL |Type of Service| Total Length | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | Identification |Flags| Fragment Offset | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | Time to Live | Protocol | Header Checksum | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | Source Address | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | Destination Address | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | Options | Padding | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + */ + struct nping_ipv4_hdr { + #if WORDS_BIGENDIAN + u8 ip_v:4; /* Version */ + u8 ip_hl:4; /* Header length */ + #else + u8 ip_hl:4; /* Header length */ + u8 ip_v:4; /* Version */ + #endif + u8 ip_tos; /* Type of service */ + u16 ip_len; /* Total length */ + u16 ip_id; /* Identification */ + u16 ip_off; /* Fragment offset field */ + u8 ip_ttl; /* Time to live */ + u8 ip_p; /* Protocol */ + u16 ip_sum; /* Checksum */ + struct in_addr ip_src; /* Source IP address */ + struct in_addr ip_dst; /* Destination IP address */ + u8 options[MAX_IP_OPTIONS_LEN]; /* IP Options */ + }__attribute__((__packed__)); + + typedef struct nping_ipv4_hdr nping_ipv4_hdr_t; + + nping_ipv4_hdr_t h; + + int ipoptlen; /**< Length of IP options */ + + public: + + /* Misc */ + IPv4Header(); + ~IPv4Header(); + 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; + + /* IP version */ + int setVersion(); + u8 getVersion() const; + + /* Header Length */ + int setHeaderLength(); + int setHeaderLength(u8 l); + u8 getHeaderLength() const; + + /* Type of Service */ + int setTOS(u8 v); + u8 getTOS() const; + + /* Total length of the datagram */ + int setTotalLength(); + int setTotalLength(u16 l); + u16 getTotalLength() const; + + /* Identification value */ + int setIdentification(); + int setIdentification(u16 i); + u16 getIdentification() const; + + /* Fragment Offset */ + int setFragOffset(); + int setFragOffset(u16 f); + u16 getFragOffset() const; + + /* Flags */ + int setRF(); + int unsetRF(); + bool getRF() const; + int setDF(); + int unsetDF(); + bool getDF() const; + int setMF(); + int unsetMF(); + bool getMF() const; + + /* Time to live */ + int setTTL(); + int setTTL(u8 t); + u8 getTTL() const; + + /* Next protocol */ + int setNextProto(u8 p); + int setNextProto(const char *p); + u8 getNextProto() const; + int setNextHeader(u8 val); + u8 getNextHeader() const; + + /* Checksum */ + int setSum(); + int setSum(u16 s); + int setSumRandom(); + u16 getSum() const; + + /* Destination IP */ + int setDestinationAddress(u32 d); + int setDestinationAddress(struct in_addr d); + const u8 *getDestinationAddress() const; + struct in_addr getDestinationAddress(struct in_addr *result) const; + + + /* Source IP */ + int setSourceAddress(u32 d); + int setSourceAddress(struct in_addr d); + const u8 *getSourceAddress() const; + struct in_addr getSourceAddress(struct in_addr *result) const; + + u16 getAddressLength() const; + + /* IP Options */ + int setOpts(const char *txt); + int setOpts(u8 *opts_buff, u32 opts_len); + const u8 *getOpts() const; + const u8 *getOpts(int *len) const; + int printOptions() const; + const char *getOptionsString() const; + +}; /* End of class IPv4Header */ + +#endif |