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 | *
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5 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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6 | *
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7 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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8 | */
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9 |
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10 | #include "libbb.h"
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11 |
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12 | /* do nothing signal handler */
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13 | static void askpass_timeout(int UNUSED_PARAM ignore)
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14 | {
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15 | }
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16 |
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17 | char* FAST_FUNC bb_ask_stdin(const char *prompt)
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18 | {
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19 | return bb_ask(STDIN_FILENO, 0, prompt);
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20 | }
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21 | char* FAST_FUNC bb_ask(const int fd, int timeout, const char *prompt)
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22 | {
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23 | /* Was static char[BIGNUM] */
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24 | enum { sizeof_passwd = 128 };
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25 |
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26 | char *passwd;
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27 | char *ret;
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28 | int i;
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29 | struct sigaction sa, oldsa;
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30 | struct termios tio, oldtio;
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31 |
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32 | tcflush(fd, TCIFLUSH);
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33 | /* Was buggy: was printing prompt *before* flushing input,
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34 | * which was upsetting "expect" based scripts of some users.
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35 | */
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36 | fputs(prompt, stdout);
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37 | fflush_all();
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38 |
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39 | tcgetattr(fd, &oldtio);
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40 | tio = oldtio;
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41 | #if 0
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42 | /* Switch off UPPERCASE->lowercase conversion (never used since 198x)
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43 | * and XON/XOFF (why we want to mess with this??)
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44 | */
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45 | # ifndef IUCLC
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46 | # define IUCLC 0
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47 | # endif
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48 | tio.c_iflag &= ~(IUCLC|IXON|IXOFF|IXANY);
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49 | #endif
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50 | /* Switch off echo */
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51 | tio.c_lflag &= ~(ECHO|ECHOE|ECHOK|ECHONL);
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52 | tcsetattr(fd, TCSANOW, &tio);
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53 |
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54 | memset(&sa, 0, sizeof(sa));
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55 | /* sa.sa_flags = 0; - no SA_RESTART! */
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56 | /* SIGINT and SIGALRM will interrupt reads below */
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57 | sa.sa_handler = askpass_timeout;
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58 | sigaction(SIGINT, &sa, &oldsa);
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59 | if (timeout) {
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60 | sigaction_set(SIGALRM, &sa);
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61 | alarm(timeout);
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62 | }
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63 |
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64 | passwd = auto_string(xmalloc(sizeof_passwd));
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65 | ret = passwd;
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66 | i = 0;
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67 | while (1) {
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68 | int r = read(fd, &ret[i], 1);
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69 | if ((i == 0 && r == 0) /* EOF (^D) with no password */
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70 | || r < 0
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71 | ) {
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72 | /* read is interrupted by timeout or ^C */
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73 | ret = NULL;
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74 | break;
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75 | }
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76 | if (r == 0 /* EOF */
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77 | || ret[i] == '\r' || ret[i] == '\n' /* EOL */
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78 | || ++i == sizeof_passwd-1 /* line limit */
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79 | ) {
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80 | ret[i] = '\0';
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81 | break;
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82 | }
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83 | }
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84 |
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85 | if (timeout) {
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86 | alarm(0);
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87 | }
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88 | sigaction_set(SIGINT, &oldsa);
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89 | tcsetattr(fd, TCSANOW, &oldtio);
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90 | bb_putchar('\n');
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91 | fflush_all();
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92 | return ret;
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93 | }
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