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/* Copyright 1993-95 by Carl Harris, Jr. Copyright 1996 by Eric S. Raymond
* All rights reserved.
* For license terms, see the file COPYING in this directory.
*/
/***********************************************************************
module: getpass.c
project: popclient
programmer: Carl Harris, ceharris@mal.com
description: getpass() replacement which allows for long passwords.
***********************************************************************/
#include <config.h>
#if defined(STDC_HEADERS)
#include <stdio.h>
#endif
#include <signal.h>
#define INPUT_BUF_SIZE MAX_PASSWORD_LENGTH
#if defined(HAVE_TERMIOS_H) && defined(HAVE_TCSETATTR)
# include <termios.h>
#else
#if defined(HAVE_TERMIO_H)
# include <sys/ioctl.h>
# include <termio.h>
#else
#if defined(HAVE_SGTTY_H)
# include <sgtty.h>
#endif
#endif
#endif
static int ttyfd;
#if defined(HAVE_TCSETATTR)
static struct termios termb;
static tcflag_t flags;
#else
#if defined(HAVE_TERMIO_H)
static struct termio termb;
static unsigned short flags;
#else
#if defined(HAVE_STTY)
static struct sgttyb ttyb;
static int flags;
#endif
#endif
#endif
void save_tty_state();
void disable_tty_echo();
void restore_tty_state();
char *
getpassword(prompt)
char *prompt;
{
#if !(defined(HAVE_TCSETATTR) || defined(HAVE_TERMIO_H) || defined(HAVE_STTY))
#if defined(HAVE_GETPASS)
char *getpass();
return getpass(prompt);
#else
fputs("ERROR: no support for getpassword() routine\n",stderr);
exit(1);
#endif
#endif /* !(defined(HAVE_TCSETATTR) || ... */
register char *p;
register c;
FILE *fi;
static char pbuf[INPUT_BUF_SIZE];
RETSIGTYPE (*sig)();
RETSIGTYPE sigint_handler();
/* get the file descriptor for the input device */
if ((fi = fdopen(open("/dev/tty", 2), "r")) == NULL)
fi = stdin;
else
setbuf(fi, (char *)NULL);
/* store descriptor for the tty */
ttyfd = fileno(fi);
/* preserve tty state before turning off echo */
save_tty_state();
/* now that we have the current tty state, we can catch SIGINT and
exit gracefully */
sig = signal(SIGINT, sigint_handler);
/* turn off echo on the tty */
disable_tty_echo();
/* display the prompt and get the input string */
fprintf(stderr, "%s", prompt); fflush(stderr);
for (p=pbuf; (c = getc(fi))!='\n' && c!=EOF;) {
if (p < &pbuf[INPUT_BUF_SIZE - 1])
*p++ = c;
}
*p = '\0';
/* write a newline so cursor won't appear to hang */
fprintf(stderr, "\n"); fflush(stderr);
/* restore previous state of the tty */
restore_tty_state();
/* restore previous state of SIGINT */
signal(SIGINT, sig);
if (fi != stdin)
fclose(fi);
return(pbuf);
}
void
save_tty_state ()
{
#if defined(HAVE_TCSETATTR)
tcgetattr(ttyfd, &termb);
flags = termb.c_lflag;
#else
#if defined(HAVE_TERMIO_H)
ioctl(ttyfd, TCGETA, (char *) &termb);
flags = termb.c_lflag;
#else /* we HAVE_STTY */
gtty(ttyfd, &ttyb);
flags = ttyb.sg_flags;
#endif
#endif
}
void
disable_tty_echo()
{
/* turn off echo on the tty */
#if defined(HAVE_TCSETATTR)
termb.c_lflag &= ~ECHO;
tcsetattr(ttyfd, TCSAFLUSH, &termb);
#else
#if defined(HAVE_TERMIO_H)
termb.c_lflag &= ~ECHO;
ioctl(ttyfd, TCSETA, (char *) &termb);
#else /* we HAVE_STTY */
ttyb.sg_flags &= ~ECHO;
stty(ttyfd, &ttyb);
#endif
#endif
}
void
restore_tty_state()
{
/* restore previous tty echo state */
#if defined(HAVE_TCSETATTR)
termb.c_lflag = flags;
tcsetattr(ttyfd, TCSAFLUSH, &termb);
#else
#if defined(HAVE_TERMIO_H)
termb.c_lflag = flags;
ioctl(ttyfd, TCSETA, (char *) &termb);
#else /* we HAVE_STTY */
ttyb.sg_flags = flags;
stty(ttyfd, &ttyb);
#endif
#endif
}
RETSIGTYPE sigint_handler ()
{
restore_tty_state();
fputs("\nCaught signal... bailing out.\n", stderr);
exit(1);
}
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