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/*** This Programs/Libraries are (C)opyright by Sebastian Krahmer.
*** You may use it under the terms of the GPL. You should have
*** already received the file COPYING that shows you your rights.
*** Please look at COPYING for further license-details.
***
*** THERE IS ABSOLUTELY NO WARRANTY. SO YOU USE IT AT YOUR OWN RISK.
*** IT WAS WRITTEN IN THE HOPE THAT IT WILL BE USEFULL. I AM NOT RESPONSIBLE
*** FOR ANY DAMAGE YOU MAYBE GET DUE TO USING MY PROGRAMS.
***/
#ifndef _TCP_H_
#define _TCP_H_
#include "usi-structs.h"
#include "datalink.h"
#include "ip.h"
#include <cstring>
namespace usipp {
/** \class TCP
* All about TCP
*/
class TCP : public IP {
private:
struct tcphdr tcph;
char tcpOptions[40];
unsigned int opt_offset;
struct pseudohdr pseudo;
/*
* "cached" data from parsed TCP options
*/
mutable unsigned int timestamps[2], wscale;
public:
TCP(void);
/*! Expects hostname or IP-adress.
*/
TCP(const char*);
/*! Destructor
*/
virtual ~TCP();
/*! Assign-operator
*/
TCP &operator=(const TCP&);
/*! Copy-constructor
*/
TCP(const TCP&);
/*! Get sourceport of packet, in host-order.
*/
u_int16_t get_srcport() const;
/*! Get destination-port in host-order
*/
u_int16_t get_dstport() const;
/*! Get sequencenumber of packet.
*/
u_int32_t get_seq() const;
/*! Get acknowlegde-number of packet.
*/
u_int32_t get_ack() const;
/*! Get TCP-data offset, sometimes called TCP-header-length.
* Should be 20 in most cases.
*/
u_int8_t get_off() const;
/*! Get TCP-flags. Can be either of
* TH_SYN
* TH_ACK
* TH_FIN
* TH_RST
* TH_PUSH
* TH_URG
* or any combination of these (althought common combinations are SYN|ACK or
* similar)
*/
u_int8_t get_flags() const;
/*!*/
u_int16_t get_win() const;
/*!*/
u_int16_t get_tcpsum() const;
/*!
*/
u_int16_t get_urg() const;
u_int32_t get_wscale() const;
/*! Set source-port
*/
int set_srcport(u_int16_t);
/*! Set destination-port
*/
int set_dstport(u_int16_t);
/*!
*/
int set_seq(u_int32_t);
/*!*/
int set_ack(u_int32_t);
/*!*/
int set_off(u_int8_t);
/*!*/
int set_flags(u_int8_t);
/*!*/
int set_win(u_int16_t);
/*! Set TCP-checksum.
* Doing these will prevent sendpack() from doing this for you.
* It's not recommented that you do so, coz the sum will almost
* be weak.
*/
int set_tcpsum(u_int16_t);
/*!*/
int set_urg(u_int16_t);
/*! Return complete TCP header.
* Usefull for some kinds of ICMP messages
*/
tcphdr get_tcphdr() const;
int set_tcphdr(struct tcphdr);
/* The following functions are already defined in IP {}.
* We need them too for TCP {}, and TCP{} calls IP::function() then.
*/
/*! Capture a packet from the net.
*/
virtual int sniffpack(void *buf, size_t buflen);
/*! Send a packet.
*/
virtual int sendpack(void *payload, size_t paylen);
/*! Send a string.
*/
virtual int sendpack(char *pay_string);
/*! Just sets filter to TCP and calls Datalink::initdevice()
*/
virtual int init_device(char *, int, size_t);
/*! Set a TCP-option of kind
*/
int set_tcpopt(char kind, unsigned char len, union tcp_options t);
/*! Clear header from all options
*/
int reset_tcpopt();
/*! Fill buffer with 20 bytes, return the length of option-field.
*/
int get_tcpopt(char *);
int set_tcpopt(char *, unsigned int);
friend bool operator== (const TCP& left, const TCP& right) {
char left_options[40], right_options[40];
bool options_matched=false;
memset(left_options, 0, sizeof(left_options));
memset(right_options, 0, sizeof(right_options));
/* remove const'ness for a second */
left.get_parsed_tcpopt(left_options, sizeof(left_options));
right.get_parsed_tcpopt(right_options, sizeof(right_options));
if( (memcmp(left_options, right_options, sizeof(left_options))) == 0) {
options_matched = true;
}
return (left.get_flags() == right.get_flags() &&
left.get_win() == right.get_win() &&
left.get_off() == right.get_off()&&
left.get_urg() == right.get_urg() &&
options_matched && operator==((IP)left, (IP)right));
}
int get_parsed_tcpopt(char *, unsigned int) const;
unsigned int get_tcpopt_tsv(void) { return timestamps[0]; }
unsigned int get_tcpopt_tse(void) { return timestamps[1]; }
std::string to_string(void);
};
} // namespace usipp
#endif // _TCP_H_
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