Contents of /tags/mkinitrd-6_1_12/busybox/libbb/bb_askpass.c
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Tue Nov 17 21:24:51 2009 UTC (14 years, 10 months ago) by niro
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File size: 1736 byte(s)
Tue Nov 17 21:24:51 2009 UTC (14 years, 10 months ago) by niro
File MIME type: text/plain
File size: 1736 byte(s)
tagged 'mkinitrd-6_1_12'
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 UNUSED_PARAM ignore) |
17 | { |
18 | } |
19 | |
20 | char* FAST_FUNC bb_askpass(int timeout, const char *prompt) |
21 | { |
22 | /* Was static char[BIGNUM] */ |
23 | enum { sizeof_passwd = 128 }; |
24 | static char *passwd; |
25 | |
26 | char *ret; |
27 | int i; |
28 | struct sigaction sa, oldsa; |
29 | struct termios tio, oldtio; |
30 | |
31 | if (!passwd) |
32 | passwd = xmalloc(sizeof_passwd); |
33 | memset(passwd, 0, sizeof_passwd); |
34 | |
35 | tcgetattr(STDIN_FILENO, &oldtio); |
36 | tcflush(STDIN_FILENO, TCIFLUSH); |
37 | tio = oldtio; |
38 | tio.c_iflag &= ~(IUCLC|IXON|IXOFF|IXANY); |
39 | tio.c_lflag &= ~(ECHO|ECHOE|ECHOK|ECHONL|TOSTOP); |
40 | tcsetattr_stdin_TCSANOW(&tio); |
41 | |
42 | memset(&sa, 0, sizeof(sa)); |
43 | /* sa.sa_flags = 0; - no SA_RESTART! */ |
44 | /* SIGINT and SIGALRM will interrupt read below */ |
45 | sa.sa_handler = askpass_timeout; |
46 | sigaction(SIGINT, &sa, &oldsa); |
47 | if (timeout) { |
48 | sigaction_set(SIGALRM, &sa); |
49 | alarm(timeout); |
50 | } |
51 | |
52 | fputs(prompt, stdout); |
53 | fflush(stdout); |
54 | ret = NULL; |
55 | /* On timeout or Ctrl-C, read will hopefully be interrupted, |
56 | * and we return NULL */ |
57 | if (read(STDIN_FILENO, passwd, sizeof_passwd - 1) > 0) { |
58 | ret = passwd; |
59 | i = 0; |
60 | /* Last byte is guaranteed to be 0 |
61 | (read did not overwrite it) */ |
62 | do { |
63 | if (passwd[i] == '\r' || passwd[i] == '\n') |
64 | passwd[i] = '\0'; |
65 | } while (passwd[i++]); |
66 | } |
67 | |
68 | if (timeout) { |
69 | alarm(0); |
70 | } |
71 | sigaction_set(SIGINT, &oldsa); |
72 | |
73 | tcsetattr_stdin_TCSANOW(&oldtio); |
74 | bb_putchar('\n'); |
75 | fflush(stdout); |
76 | return ret; |
77 | } |