Masking Password with *'s Post: 302480291

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Top Forums Programming Masking Password with *'s Post 302480291 by jim mcnamara on Tuesday 14th of December 2010 12:27:30 PM

12-14-2010

Registered User

my bad - this works, my code had several logic errors - thanks corona.

Code:

#include <stdio.h>
#include <termios.h>
#include <unistd.h>
#include <string.h>

struct termios save;

void echoOff()
{
  struct termios term;

  tcgetattr( 0, &save );
  term = save;
  term.c_lflag &= ~(ICANON | ECHO);;
  term.c_cc[VMIN]=0;
  term.c_cc[VTIME]=0;
  
  tcsetattr( 0, TCSANOW, &term );
}

void echoOn()
{
  tcsetattr( 0, TCSANOW, &save );
}

int kbd_rd(const int fd)  /* wait 2 seconds to read keyboard stroke */
{
    fd_set set_read;
    int maxfd = fd + 1;
    int ch=0;
    char buf[4]={0x0};
    struct timeval tv_tmout={0,0};
    tv_tmout.tv_sec=99;
    FD_ZERO(&set_read);
    FD_SET(fd, &set_read);
    select(maxfd, &set_read, NULL, NULL, &tv_tmout);
    if (FD_ISSET(fd, &set_read))
        read(fd, buf, 1);
    ch=buf[0];

    return ch;
}


int main()
{
  char password[30]={0x0};
  char *p=password;
  int ch=0;
  int fd=fileno(stdin);
  
  echoOff();
  while( (ch=kbd_rd(fd)) )
  {
      printf("%c", (ch=='\n') ? ch : '*');
      fflush(stdout);
      if(ch=='\n') break;
      *p=ch;
      p++;
  }
  
  echoOn();

  printf("Hello dude, your Password was: %s\n", password );

  return 0;
}

There is no error checking, plus tcsetattr() will return success even if it does not set all the attributes correctly. See 'Advanced Programming in the UNIX Environment' - Stevens & Rago - section on terminal I/O/

jim mcnamara

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LEARN ABOUT DEBIAN

dbix::password

Password(3pm)						User Contributed Perl Documentation					     Password(3pm)

NAME

       DBIx::Password - Allows you to create a global password file for DB passwords

SYNOPSIS

	 use DBIx::Password;
	 my $dbh = DBIx::Password->connect($user);
	 my $dbh = DBIx::Password->connect_cached($user);
	 $dbh->getDriver;
	 DBIx::Password::getDriver($user);
	 DBIx::Password::checkVirtualUser($user);

	 DBIx::Password::clearConfig();
	 DBIx::Password::readConfig("$ENV{HOME}/.my.secret.file");

DESCRIPTION

       Don't you hate keeping track of database passwords and such throughout your scripts? How about the problem of changing those passwords on a
       mass scale? This module is one possible solution. It stores all your virtual users and data in /etc/dbix-password.conf.	For each user you
       need to specify the database module to use, the database connect string, the username and the password.	You will have to give a name to
       this virtual user.  You can add as many as you like.

       I would recommend that if you are only using this with web applications that you change the final permissions on this package after it is
       installed in site_perl such that only the webserver can read it.

       A method called getDriver has been added so that you can determine what driver is being used (handy for working out database indepence
       issues).

       If you want to find out if the virtual user is valid, you can call the class method checkVirtualUser().	It returns true(1) if the
       username is valid, and zero if not.

       Once your are done you can use the connect method (or the connect_cache method) that comes with DBIx-Password and just specify one of the
       virtual users you defined while making the module.

       BTW I learned the bless hack that is used from Apache::DBI so some credit should go to the authors of that module.  This is a rewrite of
       the module Tangent::DB that I did for slashcode.

       If your program does not need the system-wide information stored in the /etc/dbix-password.conf file, you may use the clearConfig() and
       readConfig() functions to get the data from another source.  At any time, readConfig() may also be used to merge the data from another file
       into the currently-loaded configuration.

       Hope you enjoy it.

HOME

       To find out more information look at: http://www.tangent.org/DBIx-Password/

AUTHOR

       Brian Aker, brian@tangent.org

SEE ALSO

       perl(1). DBI(3).

perl v5.10.0							    2009-05-09							     Password(3pm)