/***************************************************************************
* 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************************
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***************************************************************************/
#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_PUSH 0x08
#define TH_ACK 0x10
#define TH_URG 0x20
#define TH_ECN 0x40
#define TH_CWR 0x80
#define TCP_HEADER_LEN 20
#define MAX_TCP_OPTIONS_LEN 40
class TCPHeader : public TransportLayerElement {
private:
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;
struct tcpopt_hdr {
u_char type; /* type */
u_char len; /* length */
u_short value; /* value */
};
int tcpoptlen; /**< Length of TCP options */
public:
TCPHeader();
~TCPHeader();
void reset();
u8 *getBufferPointer();
int storeRecvData(const u8 *buf, size_t len);
int validate();
int setSrcPort(u16 p);
u16 getSrcPort();
int setDstPort(u16 p);
u16 getDstPort();
int setSeq(u32 p);
u32 getSeq();
int setAck(u32 p);
u32 getAck();
int setOffset(u8 o);
int setOffset();
u8 getOffset();
int setFlags(u8 f);
u8 getFlags();
bool setCWR();
bool unsetCWR();
bool getCWR();
bool setECE();
bool unsetECE();
bool getECE();
bool setECN();
bool unsetECN();
bool getECN();
bool setURG();
bool unsetURG();
bool getURG();
bool setACK();
bool unsetACK();
bool getACK();
bool setPUSH();
bool unsetPUSH();
bool getPUSH();
bool setRST();
bool unsetRST();
bool getRST();
bool setSYN();
bool unsetSYN();
bool getSYN();
bool setFIN();
bool unsetFIN();
bool getFIN();
int setWindow(u16 p);
u16 getWindow();
int setUrgPointer(u16 l);
u16 getUrgPointer();
int setSum(u16 s);
int setSum(struct in_addr source, struct in_addr destination);
int setSumRandom();
int setSumRandom(struct in_addr source, struct in_addr destination);
u16 getSum();
}; /* End of class TCPHeader */
#endif /* __TCPHEADER_H__ */