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/* getpass() - read a password Author: Kees J. Bot
* Feb 16 1993
*/
#include <sys/cdefs.h>
#include "namespace.h"
#include <sys/types.h>
#include <fcntl.h>
#include <unistd.h>
#include <signal.h>
#include <termios.h>
#include <string.h>
#ifdef __weak_alias
__weak_alias(getpass, _getpass)
#endif
static int intr;
static void catch(int sig)
{
intr= 1;
}
char *getpass(const char *prompt)
{
struct sigaction osa, sa;
struct termios cooked, raw;
static char password[32+1];
int fd, n= 0;
/* Try to open the controlling terminal. */
if ((fd= open("/dev/tty", O_RDONLY)) < 0) return NULL;
/* Trap interrupts unless ignored. */
intr= 0;
sigaction(SIGINT, NULL, &osa);
if (osa.sa_handler != SIG_IGN) {
sigemptyset(&sa.sa_mask);
sa.sa_flags= 0;
sa.sa_handler= catch;
sigaction(SIGINT, &sa, &osa);
}
/* Set the terminal to non-echo mode. */
tcgetattr(fd, &cooked);
raw= cooked;
raw.c_iflag|= ICRNL;
raw.c_lflag&= ~ECHO;
raw.c_lflag|= ECHONL;
raw.c_oflag|= OPOST | ONLCR;
tcsetattr(fd, TCSANOW, &raw);
/* Print the prompt. (After setting non-echo!) */
write(2, prompt, strlen(prompt));
/* Read the password, 32 characters max. */
while (read(fd, password+n, 1) > 0) {
if (password[n] == '\n') break;
if (n < 32) n++;
}
password[n]= 0;
/* Terminal back to cooked mode. */
tcsetattr(fd, TCSANOW, &cooked);
close(fd);
/* Interrupt? */
sigaction(SIGINT, &osa, NULL);
if (intr) raise(SIGINT);
return password;
}
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