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#include "super.h"
#include "version.h"
/* glibc says to use TCSASOFT if it's available. */
#ifndef TCSASOFT
#define TCSASOFT 0
#endif
#ifdef HAVE_TERMIOS_H
static struct termios old, new;
#ifdef HAVE_TCGETATTR
#define Gtty(fd, arg) tcgetattr(fd, arg)
#else
#ifdef TIOCGETA
#define Gtty(fd, arg) ioctl(fd, TIOCGETA, arg)
#else
#define Gtty(fd, arg) ioctl(fd, TCGETA, arg)
#endif
#endif
#ifdef HAVE_TCSETATTR
#define Stty(fd, arg) tcsetattr(fd, TCSAFLUSH|TCSASOFT, arg)
#else
#define Stty(fd, arg) ioctl(fd, TCSAFLUSH, arg)
#endif
/* From Gordon Lack: do not turn off ICANON (erase and kill processing):
* on some OS's, chars will come through in bunches of 4; and
* it is incompatible with getpass(), which does erase and kill
* processing anyway.
*/
#define ECHO_OFF(tios) ((tios).c_lflag &= ~ECHO)
#else
#ifdef HAVE_TERMIO_H
static struct termio old, new;
#define Gtty(fd, arg) ioctl(fd, TCGETA, arg)
#define Stty(fd, arg) ioctl(fd, TCSETAF, arg)
#define ECHO_OFF(tio) ((tio).c_lflag &= ~ECHO)
#else
#ifdef HAVE_SGTTY_H
static struct sgttyb old, new;
#define ECHO_OFF(tty) ((tty).sg_flags &= ~(ECHO))
#define Gtty(fd, arg) gtty(fd, arg)
#define Stty(fd, arg) stty(fd, arg)
#else
#error "You do not have any of termios.h, termio.h, sgtty.h!"
#endif
#endif
#endif
/* We want to catch signals, so that we can restore terminal
* settings before responding to signals.
*/
static void (*oldHUP)(), (*oldINT)(), (*oldQUIT)();
static void (*oldALRM)(), (*oldTERM)(), (*oldPIPE)();
static int fdin=0, fdout=1;
static void restoresig();
static void setsighdl();
static void sighdl();
/*
* In order to stay compatible with (very) old Unixes, we stick
* with the old signal() interface. So, it won't do the right thing
* if multiple signals are received quickly, but that's just tough
* luck for the (ab)user -- all we really want to do is restore
* terminal settings when a signal is received, and if a user is
* trying to be too clever by half with signals, all they will get
* is an aborted super() call and a non-echoing terminal.
*/
static void
sighdl(sig)
int sig;
{
/* Restore everything, then resignal */
Stty(fdin, &old);
restoresig();
kill(getpid(), sig);
}
static void
setsighdl()
{
oldHUP = (void (*)()) signal(SIGHUP, sighdl);
oldINT = (void (*)()) signal(SIGINT, sighdl);
oldQUIT = (void (*)()) signal(SIGQUIT, sighdl);
oldALRM = (void (*)()) signal(SIGALRM, sighdl);
oldTERM = (void (*)()) signal(SIGTERM, sighdl);
oldPIPE = (void (*)()) signal(SIGPIPE, sighdl);
}
static void
restoresig()
{
(void) signal(SIGHUP, oldHUP);
(void) signal(SIGINT, oldINT);
(void) signal(SIGQUIT, oldQUIT);
(void) signal(SIGALRM, oldALRM);
(void) signal(SIGTERM, oldTERM);
(void) signal(SIGPIPE, oldPIPE);
}
int
readl(fd, buf, buflen)
int fd;
char *buf;
int buflen; /* must be > 0 */
{
int n;
char *s, *end;
for (s=buf, end=buf+buflen; s < end; s++) {
n = read(fd, s, 1);
if (n != 1 || *s == '\n' || *s == '\r') {
*s = '\0';
return s-buf;
}
}
return s-buf;
}
/*
* Returns: -1 (and print message) if there was a problem adjusting
* tty settings, else number of characters in password.
*/
int
s_getpass(prompt, use_stdin, buf, n_buf)
char *prompt; /* If !null, printed as prompt.
* Uses /dev/tty unless use_stdin is set, or
* if /dev/tty can't be opened, in which case
* it uses stderr.
*/
int use_stdin; /* Directs input to come from stdin instead of
* /dev/tty.
*/
char *buf; /* Where the password is placed */
int n_buf; /* size of buf. Up to n_buf characters are written
* into *buf, and then nul-terminated.
*/
{
int nread, gtty_status;
if (use_stdin || (fdin = open("/dev/tty", O_RDWR)) == -1) {
fdin = 0;
fdout = 2; /* use stderr for prompting when input is stdin */
} else {
fdout = fdin;
}
/*
* Turn echoing off
*/
gtty_status = Gtty(fdin, &old);
new = old;
ECHO_OFF(new);
setsighdl();
if (gtty_status == 0) {
Stty(fdin, &new);
}
if (prompt) {
if (write(fdout, prompt, strlen(prompt)) != strlen(prompt))
return Error(0, 0, "write(prompt) failed\n");
}
/*
* Read password
*/
nread = readl(fdin, buf, n_buf);
if (nread >= 0) {
buf[(nread < n_buf) ? nread : (n_buf-1)] = '\0';
}
if (prompt) {
if (write(fdout, "\n", 1) != 1)
return Error(0, 0, "write(\\n) failed\n");
}
/*
* Restore terminal and signal handling.
*/
if (gtty_status == 0) {
Stty(fdin, &old);
}
if (fdin != 0) {
close(fdin);
}
restoresig();
return nread;
}
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