/***************************************************************************
* 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************************
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***************************************************************************/
#ifndef IPV4HEADER_H
#define IPV4HEADER_H 1
#include "NetworkLayerElement.h"
#define DEFAULT_IP_TTL 64 /* Default IP Time to Live */
#define IP_RF 0x8000 /* Reserved fragment flag */
#define IP_DF 0x4000 /* Dont 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 */
class IPv4Header : public NetworkLayerElement {
private:
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();
void zero();
u8 *getBufferPointer();
int storeRecvData(const u8 *buf, size_t len);
int validate();
/* IP version */
int setVersion();
u8 getVersion();
/* Header Length */
int setHeaderLength();
int setHeaderLength(u8 l);
u8 getHeaderLength();
/* Type of Service */
int setTOS(u8 v);
u8 getTOS();
/* Total lenght of the datagram */
int setTotalLength();
int setTotalLength(u16 l);
u16 getTotalLength();
/* Identification value */
int setIdentification();
int setIdentification(u16 i);
u16 getIdentification();
/* Fragment Offset */
int setFragOffset();
int setFragOffset(u16 f);
u16 getFragOffset();
/* Flags */
int setRF();
int unsetRF();
bool getRF();
int setDF();
int unsetDF();
bool getDF();
int setMF();
int unsetMF();
bool getMF();
/* Time to live */
int setTTL();
int setTTL(u8 t);
u8 getTTL();
/* Next protocol */
int setNextProto(u8 p);
int setNextProto(const char *p);
u8 getNextProto();
/* Checksum */
int setSum();
int setSum(u16 s);
int setSumRandom();
u16 getSum();
/* Destination IP */
int setDstIP(u32 d);
int setDstIP(struct in_addr d);
struct in_addr getDstIP();
/* Source IP */
int setSrcIP(u32 d);
int setSrcIP(struct in_addr d);
struct in_addr getSrcIP();
/* IP Options */
int setOpts(const char *txt);
u8 *getOpts();
u8 *getOpts(int *len);
int printOptions();
char *getOptionsString();
}; /* End of class IPv4Header */
#endif