1 /* vi: set sw=4 ts=4: */
5 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
7 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
12 /* do nothing signal handler */
13 static void askpass_timeout(int UNUSED_PARAM ignore)
17 char* FAST_FUNC bb_ask_stdin(const char *prompt)
19 return bb_ask(STDIN_FILENO, 0, prompt);
21 char* FAST_FUNC bb_ask(const int fd, int timeout, const char *prompt)
23 /* Was static char[BIGNUM] */
24 enum { sizeof_passwd = 128 };
29 struct sigaction sa, oldsa;
30 struct termios tio, oldtio;
32 tcflush(fd, TCIFLUSH);
33 /* Was buggy: was printing prompt *before* flushing input,
34 * which was upsetting "expect" based scripts of some users.
36 fputs(prompt, stdout);
39 tcgetattr(fd, &oldtio);
42 /* Switch off UPPERCASE->lowercase conversion (never used since 198x)
43 * and XON/XOFF (why we want to mess with this??)
48 tio.c_iflag &= ~(IUCLC|IXON|IXOFF|IXANY);
51 tio.c_lflag &= ~(ECHO|ECHOE|ECHOK|ECHONL);
52 tcsetattr(fd, TCSANOW, &tio);
54 memset(&sa, 0, sizeof(sa));
55 /* sa.sa_flags = 0; - no SA_RESTART! */
56 /* SIGINT and SIGALRM will interrupt reads below */
57 sa.sa_handler = askpass_timeout;
58 sigaction(SIGINT, &sa, &oldsa);
60 sigaction_set(SIGALRM, &sa);
64 passwd = auto_string(xmalloc(sizeof_passwd));
68 int r = read(fd, &ret[i], 1);
69 if ((i == 0 && r == 0) /* EOF (^D) with no password */
72 /* read is interrupted by timeout or ^C */
77 || ret[i] == '\r' || ret[i] == '\n' /* EOL */
78 || ++i == sizeof_passwd-1 /* line limit */
88 sigaction_set(SIGINT, &oldsa);
89 tcsetattr(fd, TCSANOW, &oldtio);