[821] | 1 | /* vi: set sw=4 ts=4: */
|
---|
| 2 | /*
|
---|
| 3 | * Ask for a password
|
---|
| 4 | * I use a static buffer in this function. Plan accordingly.
|
---|
| 5 | *
|
---|
| 6 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
|
---|
| 7 | *
|
---|
| 8 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
|
---|
| 9 | */
|
---|
| 10 |
|
---|
| 11 | #include <termios.h>
|
---|
| 12 |
|
---|
| 13 | #include "libbb.h"
|
---|
| 14 |
|
---|
| 15 | /* do nothing signal handler */
|
---|
| 16 | static void askpass_timeout(int ATTRIBUTE_UNUSED ignore)
|
---|
| 17 | {
|
---|
| 18 | }
|
---|
| 19 |
|
---|
| 20 | char *bb_askpass(int timeout, const char * prompt)
|
---|
| 21 | {
|
---|
[1765] | 22 | /* Was static char[BIGNUM] */
|
---|
| 23 | enum { sizeof_passwd = 128 };
|
---|
| 24 | static char *passwd;
|
---|
| 25 |
|
---|
[821] | 26 | char *ret;
|
---|
[1765] | 27 | int i;
|
---|
[821] | 28 | struct sigaction sa;
|
---|
| 29 | struct termios old, new;
|
---|
| 30 |
|
---|
[1765] | 31 | if (!passwd)
|
---|
| 32 | passwd = xmalloc(sizeof_passwd);
|
---|
| 33 | memset(passwd, 0, sizeof_passwd);
|
---|
| 34 |
|
---|
[821] | 35 | tcgetattr(STDIN_FILENO, &old);
|
---|
| 36 | tcflush(STDIN_FILENO, TCIFLUSH);
|
---|
| 37 |
|
---|
| 38 | fputs(prompt, stdout);
|
---|
| 39 | fflush(stdout);
|
---|
| 40 |
|
---|
| 41 | tcgetattr(STDIN_FILENO, &new);
|
---|
| 42 | new.c_iflag &= ~(IUCLC|IXON|IXOFF|IXANY);
|
---|
| 43 | new.c_lflag &= ~(ECHO|ECHOE|ECHOK|ECHONL|TOSTOP);
|
---|
| 44 | tcsetattr(STDIN_FILENO, TCSANOW, &new);
|
---|
| 45 |
|
---|
| 46 | if (timeout) {
|
---|
| 47 | sa.sa_flags = 0;
|
---|
| 48 | sa.sa_handler = askpass_timeout;
|
---|
| 49 | sigaction(SIGALRM, &sa, NULL);
|
---|
| 50 | alarm(timeout);
|
---|
| 51 | }
|
---|
| 52 |
|
---|
[1765] | 53 | ret = NULL;
|
---|
| 54 | /* On timeout, read will hopefully be interrupted by SIGALRM,
|
---|
| 55 | * and we return NULL */
|
---|
| 56 | if (read(STDIN_FILENO, passwd, sizeof_passwd-1) > 0) {
|
---|
| 57 | ret = passwd;
|
---|
| 58 | i = 0;
|
---|
| 59 | /* Last byte is guaranteed to be 0
|
---|
| 60 | (read did not overwrite it) */
|
---|
| 61 | do {
|
---|
| 62 | if (passwd[i] == '\r' || passwd[i] == '\n')
|
---|
| 63 | passwd[i] = '\0';
|
---|
| 64 | } while (passwd[i++]);
|
---|
[821] | 65 | }
|
---|
| 66 |
|
---|
| 67 | if (timeout) {
|
---|
| 68 | alarm(0);
|
---|
| 69 | }
|
---|
| 70 |
|
---|
| 71 | tcsetattr(STDIN_FILENO, TCSANOW, &old);
|
---|
[1765] | 72 | putchar('\n');
|
---|
[821] | 73 | fflush(stdout);
|
---|
| 74 | return ret;
|
---|
| 75 | }
|
---|