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/* GetPass.c */
#include "Sys.h"
#include <signal.h>
#include "Util.h"
#include "GetPass.h"
/* This is responsible for turning off character echoing so a user
* can type a password without it showing up on the screen. Why
* not just the getpass() library function? Some systems' getpass
* only returns 8 characters. We require longer "passwords" so
* users can use their email addresses when prompted for a password.
*
* We have one function, Echo, which turns character echoing on/off.
* GetPass then uses Echo to turn it off, reads the password,
* and turns it back on again.
*
* Unfortunately this whole thing isn't very portable. Some systems
* have termio, others, sgtty. Some have both. Newer systems support
* termios, too.
*/
#ifdef CANNOT_HIDE_TEXT
/* If you can't get it to compile, you an always do this. */
void Echo(FILE *fp, int on)
{
return;
}
#else
#ifdef HAVE_TERMIOS_H
# include <termios.h>
#else
# ifdef HAVE_TERMIO_H
# include <termio.h>
# else
# ifdef HAVE_SYS_IOCTL_H
# include <sys/ioctl.h> /* For TIOxxxx constants. */
# endif
# include <sgtty.h>
# endif
#endif /* !HAVE_TERMIOS_H */
#ifdef STRICT_PROTOS
int ioctl(int, int, ...);
#endif
extern int gWinInit;
void Echo(FILE *fp, int on)
{
#ifdef HAVE_TERMIOS_H
static struct termios orig, noecho, *tp;
#else
# ifdef HAVE_TERMIO_H
static struct termio orig, noecho, *tp;
# else
static struct sgttyb orig, noecho, *tp;
# endif
#endif
static int state = 0;
int fd = fileno(fp);
/* Don't do this if we've setup curses, which makes this crap
* irrelevant anyway.
*/
if (gWinInit)
return;
if (!isatty(fd))
return;
if (state == 0) {
#ifdef HAVE_TERMIOS_H
if (tcgetattr(fd, &orig) < 0)
perror("tcgetattr");
noecho = orig;
noecho.c_lflag &= ~ECHO;
#else
# ifdef HAVE_TERMIO_H
if (ioctl(fd, TCGETA, &orig) < 0)
perror("ioctl");
noecho = orig;
noecho.c_lflag &= ~ECHO;
# else
if (ioctl(fd, TIOCGETP, &orig) < 0)
perror("ioctl");
noecho = orig;
noecho.sg_flags &= ~ECHO;
# endif
#endif
state = 1;
}
tp = NULL;
if (on && state == 2) {
/* Turn echo back on. */
tp = &orig;
state = 1;
} else if (!on && state == 1) {
/* Turn echo off. */
tp = &noecho;
state = 2;
}
if (tp != NULL) {
#ifdef HAVE_TERMIOS_H
if (tcsetattr(fd, TCSANOW, tp) < 0)
perror("tcsetattr");
#else
# ifdef HAVE_TERMIO_H
if (ioctl(fd, TCSETA, tp) < 0)
perror("ioctl");
# else
if (ioctl(fd, TIOCSETP, tp) < 0)
perror("ioctl");
# endif
#endif /* !HAVE_TERMIOS_H */
}
} /* Echo */
#endif /* CANNOT_HIDE_TEXT */
void GetPass(char *promptstr, char *answer, size_t siz)
{
FILE *fp, *outfp;
Sig_t oldintr;
#ifdef SIGTSTP
Sig_t oldtstp;
#endif
/*
* read and write to /dev/tty if possible; else read from
* stdin and write to stderr.
*/
if ((outfp = fp = fopen("/dev/tty", "r+")) == NULL) {
outfp = stderr;
fp = stdin;
}
/* Ignore some signals that could cause problems. We don't want
* to return with echoing off.
*/
oldintr = SIGNAL(SIGINT, SIG_IGN);
#ifdef SIGTSTP
oldtstp = SIGNAL(SIGTSTP, SIG_IGN);
#endif
Echo(fp, 0); /* Turn echoing off. */
(void) fputs(promptstr, outfp);
(void) fflush(outfp);
(void) rewind(outfp);
answer[0] = '\0';
if (fgets(answer, (int) siz, fp) != NULL)
answer[strlen(answer) - 1] = '\0';
(void) fflush(fp);
Echo(fp, 1);
(void) rewind(outfp);
(void) fputc('\n', outfp);
(void) SIGNAL(SIGINT, oldintr);
#ifdef SIGTSTP
(void) SIGNAL(SIGTSTP, oldtstp);
#endif
if (fp != stdin)
(void)fclose(fp);
} /* Getpass */
/* eof Getpass.c */
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