ab24e18c7a
* do not make backup copy by copying (just retain old file) * correctly fall back to /etc/passwd if user is not in shadow * fix bug with overlong passwd entries * be permissive on some kinds of failures * reduce stack usage * code size: -500 bytes
76 lines
1.5 KiB
C
76 lines
1.5 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Ask for a password
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* I use a static buffer in this function. Plan accordingly.
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*
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* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <termios.h>
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#include <sys/ioctl.h>
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#include "libbb.h"
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/* do nothing signal handler */
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static void askpass_timeout(int ATTRIBUTE_UNUSED ignore)
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{
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}
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char *bb_askpass(int timeout, const char * prompt)
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{
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static char passwd[64];
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char *ret;
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int i;
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struct sigaction sa;
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struct termios old, new;
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tcgetattr(STDIN_FILENO, &old);
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tcflush(STDIN_FILENO, TCIFLUSH);
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memset(passwd, 0, sizeof(passwd));
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fputs(prompt, stdout);
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fflush(stdout);
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tcgetattr(STDIN_FILENO, &new);
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new.c_iflag &= ~(IUCLC|IXON|IXOFF|IXANY);
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new.c_lflag &= ~(ECHO|ECHOE|ECHOK|ECHONL|TOSTOP);
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tcsetattr(STDIN_FILENO, TCSANOW, &new);
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if (timeout) {
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sa.sa_flags = 0;
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sa.sa_handler = askpass_timeout;
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sigaction(SIGALRM, &sa, NULL);
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alarm(timeout);
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}
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ret = NULL;
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if (read(STDIN_FILENO, passwd, sizeof(passwd)-1) > 0) {
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ret = passwd;
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i = 0;
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/* Last byte is guaranteed to be 0
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(read did not overwrite it) */
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do {
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if (passwd[i] == '\r' || passwd[i] == '\n')
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passwd[i] = '\0';
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} while (passwd[i++]);
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}
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if (timeout) {
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alarm(0);
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}
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tcsetattr(STDIN_FILENO, TCSANOW, &old);
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puts("");
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fflush(stdout);
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return ret;
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}
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