LinuxQuestions.org - Header Problem

hello,
I am using 2.6 Ubuntu. So i mentioned in my program #define _USE_BSD_ even though missing header information and getting this error. Can any one help me?

Quote:

‘struct tcphdr’ has no member named ‘th_flags’
tcpg.c:139: error: ‘struct tcphdr’ has no member named ‘th_flags’
tcpg.c:140: error: ‘struct tcphdr’ has no member named ‘th_seq’
tcpg.c:140: error: ‘struct tcphdr’ has no member named ‘th_seq’
tcpg.c: In function ‘tcpg_syn’:
tcpg.c:152: error: ‘struct tcphdr’ has no member named ‘th_flags’
tcpg.c:152: error: ‘struct tcphdr’ has no member named ‘th_flags’
tcpg.c:153: error: ‘struct tcphdr’ has no member named ‘th_sport’
tcpg.c:153: error: ‘struct tcphdr’ has no member named ‘th_dport’

Code:

#define TCPG_SYN



/* Log QUESO probes. */

#define TCPG_QUESO



/* SYN flooding detection. */

#define TCPG_SYNFLOOD



/* WinNuke detection. */

#define TCPG_OOB



/* Log LAND attacks. */

#define TCPG_LAND



/* Log HPing probes and port 0 connection packets. */

#define TCPG_HPING



/* Shell daemon default port probe detection. */

#define TCPG_PORTD



/* Kill connections to TCP port TCPG_KILL. */

#define TCPG_KILL        110 



/* DON'T CHANGE ANYTHING BELOW THIS LINE !!!!!!!!!!!!!! */

/* DON'T CHANGE ANYTHING BELOW THIS LINE !!!!!!!!!!!!!! */

/* DON'T CHANGE ANYTHING BELOW THIS LINE !!!!!!!!!!!!!! */



/* Biggest list of includes you've ever seen, eh?! =;-) */

#include <libnet.h>

#include <syslog.h>

#include <stdio.h>

#include <stdlib.h>

#include <errno.h>

#include <string.h>

#define __USE_BSD_ 

#include <netinet/tcp.h>

/******************* Why not make all variables global ?!************************/ 

struct ippkt {

 struct iphdr ip;

 struct tcphdr tcp;

 char buffer[5000];

} pkt;



int s, lns;

struct in_addr src_addr;

u_char *buff;

u_int sport, dport;



void tcpg_syn();

void tcpg_hping();

void tcpg_synflood();

void tcpg_portd();

void tcpg_queso();

void tcpg_land();

void tcpg_oob();

void tcpg_die();

void tcpg_init();

void tcpg_kill(u_short);

problem in here...........

Code:

void tcpg_kill(u_short kport) 

{

 u_long src_ip=0, dst_ip=0, ack;



 /* The following kills all TCP connections to port kport ! */

 /* WARNING: This part does not make any checks !!! */

 if(ntohs(pkt.tcp.th_dport)==kport)

 {

  sport=ntohs(pkt.tcp.th_sport);

  dport=ntohs(pkt.tcp.th_dport);

  src_ip=pkt.ip.daddr;

  dst_ip=pkt.ip.saddr;

  ack=ntohl(pkt.tcp.th_seq)+1;

  buff=malloc(TCP_H+IP_H);

  bzero(buff, TCP_H+IP_H);

  build_ip(TCP_H, IPTOS_LOWDELAY | IPTOS_THROUGHPUT, 242, 0, 64, IPPROTO_TCP, src_ip, dst_ip, NULL, 0, buff);

  build_tcp(sport, dport, ack, ack, TH_RST, 4096, 0, NULL, 0, buff+IP_H);

  do_checksum(buff, IPPROTO_TCP, TCP_H);

  lns=open_raw_sock(IPPROTO_RAW);

  syslog(LOG_INFO, "WARNING: Killing connection from %s to port %d.", inet_ntoa(src_addr), kport);

  write_ip(lns, buff, IP_H+TCP_H);

  close(lns);

 }

}