source: branches/3.2/mindi-busybox/libbb/bb_askpass.c @ 3232

Last change on this file since 3232 was 3232, checked in by bruno, 5 years ago
  • Update mindi-busybox to 1.21.1
File size: 1.9 KB
Line 
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 source tree.
9 */
10
11#include "libbb.h"
12
13/* do nothing signal handler */
14static void askpass_timeout(int UNUSED_PARAM ignore)
15{
16}
17
18char* FAST_FUNC bb_ask_stdin(const char *prompt)
19{
20    return bb_ask(STDIN_FILENO, 0, prompt);
21}
22char* 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    fputs(prompt, stdout);
34    fflush_all();
35    tcflush(fd, TCIFLUSH);
36
37    tcgetattr(fd, &oldtio);
38    tio = oldtio;
39#if 0
40    /* Switch off UPPERCASE->lowercase conversion (never used since 198x)
41     * and XON/XOFF (why we want to mess with this??)
42     */
43# ifndef IUCLC
44#  define IUCLC 0
45# endif
46    tio.c_iflag &= ~(IUCLC|IXON|IXOFF|IXANY);
47#endif
48    /* Switch off echo */
49    tio.c_lflag &= ~(ECHO|ECHOE|ECHOK|ECHONL);
50    tcsetattr(fd, TCSANOW, &tio);
51
52    memset(&sa, 0, sizeof(sa));
53    /* sa.sa_flags = 0; - no SA_RESTART! */
54    /* SIGINT and SIGALRM will interrupt reads below */
55    sa.sa_handler = askpass_timeout;
56    sigaction(SIGINT, &sa, &oldsa);
57    if (timeout) {
58        sigaction_set(SIGALRM, &sa);
59        alarm(timeout);
60    }
61
62    if (!passwd)
63        passwd = xmalloc(sizeof_passwd);
64    ret = passwd;
65    i = 0;
66    while (1) {
67        int r = read(fd, &ret[i], 1);
68        if (r < 0) {
69            /* read is interrupted by timeout or ^C */
70            ret = NULL;
71            break;
72        }
73        if (r == 0 /* EOF */
74         || ret[i] == '\r' || ret[i] == '\n' /* EOL */
75         || ++i == sizeof_passwd-1 /* line limit */
76        ) {
77            ret[i] = '\0';
78            break;
79        }
80    }
81
82    if (timeout) {
83        alarm(0);
84    }
85    sigaction_set(SIGINT, &oldsa);
86    tcsetattr(fd, TCSANOW, &oldtio);
87    bb_putchar('\n');
88    fflush_all();
89    return ret;
90}
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