Contents of /tags/mkinitrd-6_2_1/busybox/libbb/bb_askpass.c
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Sun May 30 12:16:23 2010 UTC (14 years, 4 months ago) by niro
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Sun May 30 12:16:23 2010 UTC (14 years, 4 months ago) by niro
File MIME type: text/plain
File size: 1822 byte(s)
tagged 'mkinitrd-6_2_1'
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 "libbb.h" |
12 | |
13 | /* do nothing signal handler */ |
14 | static void askpass_timeout(int UNUSED_PARAM ignore) |
15 | { |
16 | } |
17 | |
18 | char* FAST_FUNC bb_ask_stdin(const char *prompt) |
19 | { |
20 | return bb_ask(STDIN_FILENO, 0, prompt); |
21 | } |
22 | char* FAST_FUNC bb_ask(const int fd, int timeout, const char *prompt) |
23 | { |
24 | /* Was static char[BIGNUM] */ |
25 | enum { sizeof_passwd = 128 }; |
26 | static char *passwd; |
27 | |
28 | char *ret; |
29 | int i; |
30 | struct sigaction sa, oldsa; |
31 | struct termios tio, oldtio; |
32 | |
33 | if (!passwd) |
34 | passwd = xmalloc(sizeof_passwd); |
35 | memset(passwd, 0, sizeof_passwd); |
36 | |
37 | tcgetattr(fd, &oldtio); |
38 | tcflush(fd, TCIFLUSH); |
39 | tio = oldtio; |
40 | #ifndef IUCLC |
41 | # define IUCLC 0 |
42 | #endif |
43 | tio.c_iflag &= ~(IUCLC|IXON|IXOFF|IXANY); |
44 | tio.c_lflag &= ~(ECHO|ECHOE|ECHOK|ECHONL|TOSTOP); |
45 | tcsetattr_stdin_TCSANOW(&tio); |
46 | |
47 | memset(&sa, 0, sizeof(sa)); |
48 | /* sa.sa_flags = 0; - no SA_RESTART! */ |
49 | /* SIGINT and SIGALRM will interrupt read below */ |
50 | sa.sa_handler = askpass_timeout; |
51 | sigaction(SIGINT, &sa, &oldsa); |
52 | if (timeout) { |
53 | sigaction_set(SIGALRM, &sa); |
54 | alarm(timeout); |
55 | } |
56 | |
57 | fputs(prompt, stdout); |
58 | fflush_all(); |
59 | ret = NULL; |
60 | /* On timeout or Ctrl-C, read will hopefully be interrupted, |
61 | * and we return NULL */ |
62 | if (read(fd, passwd, sizeof_passwd - 1) > 0) { |
63 | ret = passwd; |
64 | i = 0; |
65 | /* Last byte is guaranteed to be 0 |
66 | (read did not overwrite it) */ |
67 | do { |
68 | if (passwd[i] == '\r' || passwd[i] == '\n') |
69 | passwd[i] = '\0'; |
70 | } while (passwd[i++]); |
71 | } |
72 | |
73 | if (timeout) { |
74 | alarm(0); |
75 | } |
76 | sigaction_set(SIGINT, &oldsa); |
77 | |
78 | tcsetattr_stdin_TCSANOW(&oldtio); |
79 | bb_putchar('\n'); |
80 | fflush_all(); |
81 | return ret; |
82 | } |