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