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nmap_tty.cc

/***************************************************************************
 * nmap_tty.cc -- Handles runtime interaction with Nmap, so you can        *
 * increase verbosity/debugging or obtain a status line upon request.      *
 *                                                                         *
 ***********************IMPORTANT NMAP LICENSE TERMS************************
 *                                                                         *
 * The Nmap Security Scanner is (C) 1996-2008 Insecure.Com LLC. Nmap is    *
 * also a registered trademark of Insecure.Com LLC.  This program is free  *
 * software; you may redistribute and/or modify it under the terms of the  *
 * GNU General Public License as published by the Free Software            *
 * Foundation; Version 2 with the clarifications and exceptions described  *
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 * this software under certain conditions.  If you wish to embed Nmap      *
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 ***************************************************************************/

#ifndef WIN32
#include "config.h"
#endif

#include <sys/types.h>
#if HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#if HAVE_FCNTL_H
#include <fcntl.h>
#endif
#if HAVE_TERMIOS_H
#include <termios.h>
#endif
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <stdlib.h>

#include "nmap_tty.h"
#include "NmapOps.h"

extern NmapOps o;

#ifdef WIN32
#include <conio.h>

// Microsoft's runtime makes this fairly simple. :)
void tty_init() { return; }
static int tty_getchar() { return _kbhit() ? _getch() : -1; }
static void tty_done() { return; }

static void tty_flush(void)
{
      static HANDLE stdinput = GetStdHandle(STD_INPUT_HANDLE);

      FlushConsoleInputBuffer(stdinput);
}

#else
#if !defined(O_NONBLOCK) && defined(O_NDELAY)
#define O_NONBLOCK                  O_NDELAY
#endif

#ifdef __CYGWIN32__
#include <string.h>
#include <sys/socket.h>
#ifndef __CYGWIN__
extern int tcgetattr(int fd, struct termios *termios_p);
extern int tcsetattr(int fd, int actions, struct termios *termios_p);
#endif
#endif

static int tty_fd = 0;
static struct termios saved_ti;

static int tty_getchar()
{
      int c, numChars;
#ifdef __CYGWIN32__
      fd_set set;
      struct timeval tv;
#endif
        
      if (tty_fd && tcgetpgrp(tty_fd) == getpid()) {
           
           // This is so that when the terminal has been disconnected, it will be reconnected when possible. If it slows things down, just remove it
           // tty_init();
           
#ifdef __CYGWIN32__
            FD_ZERO(&set); FD_SET(tty_fd, &set);
            tv.tv_sec = 0; tv.tv_usec = 0;
            if (select(tty_fd + 1, &set, NULL, NULL, &tv) <= 0)
                  return -1;
#endif
            c = 0;
                numChars = read(tty_fd, &c, 1);
            if (numChars > 0) return c;
      }

      return -1;
}

static void tty_done()
{
      if (!tty_fd) return;

      tcsetattr(tty_fd, TCSANOW, &saved_ti);

      close(tty_fd);
      tty_fd = 0;
}

static void tty_flush(void)
{
      /* we don't need to test for tty_fd==0 here because
       * this isn't called unless we succeeded
       */

      tcflush(tty_fd, TCIFLUSH);
}

/*
 * Initializes the terminal for unbuffered non-blocking input. Also
 * registers tty_done() via atexit().  You need to call this before
 * you ever call keyWasPressed().
 */
void tty_init()
{
      struct termios ti;

      if (tty_fd)
            return;

      if ((tty_fd = open("/dev/tty", O_RDONLY | O_NONBLOCK)) < 0) return;

#ifndef __CYGWIN32__
      if (tcgetpgrp(tty_fd) != getpid()) {
            close(tty_fd); return;
      }
#endif

      tcgetattr(tty_fd, &ti);
      saved_ti = ti;
      ti.c_lflag &= ~(ICANON | ECHO);
      ti.c_cc[VMIN] = 1;
      ti.c_cc[VTIME] = 0;
      tcsetattr(tty_fd, TCSANOW, &ti);

      atexit(tty_done);
}

#endif  //!win32

/* Catches all of the predefined
   keypresses and interpret them, and it will also tell you if you
   should print anything. A value of true being returned means a
   nonstandard key has been pressed and the calling method should
   print a status message */
bool keyWasPressed()
{
  int c;

  if (o.noninteractive)
    return false;

  if ((c = tty_getchar()) >= 0) {
    tty_flush(); /* flush input queue */

    // printf("You pressed key '%c'!\n", c);
    if (c == 'v') {
       o.verbose++;
       log_write(LOG_STDOUT, "Verbosity Increased to %d.\n", o.verbose);
    } else if (c == 'V') {
       if (o.verbose > 0)
       o.verbose--;
       log_write(LOG_STDOUT, "Verbosity Decreased to %d.\n", o.verbose);
    } else if (c == 'd') {
       o.debugging++;
       log_write(LOG_STDOUT, "Debugging Increased to %d.\n", o.debugging);
    } else if (c == 'D') {
       if (o.debugging > 0) o.debugging--;
       log_write(LOG_STDOUT, "Debugging Decreased to %d.\n", o.debugging);
    } else if (c == 'p') {
       o.setPacketTrace(true);
       log_write(LOG_STDOUT, "Packet Tracing enabled.\n");
    } else if (c == 'P') {
       o.setPacketTrace(false);
       log_write(LOG_STDOUT, "Packet Tracing disabled.\n");
    } else if (c == '?') {
      log_write(LOG_STDOUT,
            "Interactive keyboard commands:\n"
            "?               Display this information\n"
            "v/V             Increase/decrease verbosity\n"
            "d/D             Increase/decrease debugging\n"
            "p/P             Enable/disable packet tracing\n"
            "anything else   Print status\n"
                "More help: http://www.insecure.org/nmap/man/man-runtime-interaction.html\n");
    } else {
       printStatusMessage();
       return true;
    }
  }
  return false;
}

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