src/legacy/getpass.c

   1 #define _GNU_SOURCE
   2 #include <stdio.h>
   3 #include <termios.h>
   4 #include <unistd.h>
   5 #include <fcntl.h>
   6 #include <string.h>
   7
   8 char *getpass(const char *prompt)
   9 {
  10         int fd;
  11         struct termios s, t;
  12         ssize_t l;
  13         static char password[128];
  14
  15         if ((fd = open("/dev/tty", O_RDWR|O_NOCTTY|O_CLOEXEC)) < 0) return 0;
  16
  17         tcgetattr(fd, &t);
  18         s = t;
  19         t.c_lflag &= ~(ECHO|ISIG);
  20         t.c_lflag |= ICANON;
  21         t.c_iflag &= ~(INLCR|IGNCR);
  22         t.c_iflag |= ICRNL;
  23         tcsetattr(fd, TCSAFLUSH, &t);
  24         tcdrain(fd);
  25
  26         dprintf(fd, "%s", prompt);
  27
  28         l = read(fd, password, sizeof password);
  29         if (l >= 0) {
  30                 if (l > 0 && password[l-1] == '\n' || l==sizeof password) l--;
  31                 password[l] = 0;
  32         }
  33
  34         tcsetattr(fd, TCSAFLUSH, &s);
  35
  36         dprintf(fd, "\n");
  37         close(fd);
  38
  39         return l<0 ? 0 : password;
  40 }