C source code for tcp scanning in linux

In linux, tcp scans C source code-General Linux technology-Linux programming and kernel information. The following is a detailed description. # Include
# Include
# Include
# Include
# Include
# Include
/* # Include */

Int main ()
{
Char ip [30];
Int startport, endport, sockfd, I;
Struct sockaddr_in addr;
Float costtime;
Clock_t start, end;
Printf ("Please enter the Startport \ n ");
Scanf ("% d", & startport );
Printf ("Please enter the Endport \ n ");
Scanf ("% d", & endport );
Printf ("Please enter the IP \ n ");
Scanf ("% s", ip );
If (startport <1 | endport> 65535 | endport {
Printf ("port range error! \ N ");
Return 0;
}
Else
Printf ("Interesting ports % d-% d on % s \ n", startport, endport, ip );
Addr. sin_family = AF_INET;
Addr. sin_addr.s_addr = inet_addr (ip );
Start = clock ();
Printf ("port state \ n ");
For (I = startport; I <= endport; I ++)
{
Sockfd = socket (AF_INET, SOCK_STREAM, 0 );
Addr. sin_port = htons (I );
If (connect (sockfd, (struct sockaddr_in *) & addr, sizeof (struct sockaddr_in) = 0)
{
Printf ("% 5d open \ n", I );
Close (addr );
}
}
End = clock ();
Costtime = (float) (end-start)/CLOCKS_PER_SEC;
Printf ("\ nSmart Nmap finished: % s scanned in % f seconds \ n", ip, costtime );
Return 0;
}

This code is absolutely useful for my experiments. if you have any questions, please leave a message .......