busybox/libbb/bb_askpass.c

/* vi: set sw=4 ts=4: */
/*
 * Ask for a password
 * I use a static buffer in this function.  Plan accordingly.
 *
 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
 *
 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 */

#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <signal.h>
#include <termios.h>
#include <sys/ioctl.h>

#include "libbb.h"

/* do nothing signal handler */
static void askpass_timeout(int ATTRIBUTE_UNUSED ignore)
{
}

char *bb_askpass(int timeout, const char * prompt)
{
	static char passwd[64];

	char *ret;
	int i;
	struct sigaction sa;
	struct termios old, new;

	tcgetattr(STDIN_FILENO, &old);
	tcflush(STDIN_FILENO, TCIFLUSH);

	memset(passwd, 0, sizeof(passwd));

	fputs(prompt, stdout);
	fflush(stdout);

	tcgetattr(STDIN_FILENO, &new);
	new.c_iflag &= ~(IUCLC|IXON|IXOFF|IXANY);
	new.c_lflag &= ~(ECHO|ECHOE|ECHOK|ECHONL|TOSTOP);
	tcsetattr(STDIN_FILENO, TCSANOW, &new);

	if (timeout) {
		sa.sa_flags = 0;
		sa.sa_handler = askpass_timeout;
		sigaction(SIGALRM, &sa, NULL);
		alarm(timeout);
	}

	ret = NULL;
	if (read(STDIN_FILENO, passwd, sizeof(passwd)-1) > 0) {
		ret = passwd;
		i = 0;
		/* Last byte is guaranteed to be 0
		   (read did not overwrite it) */
		do {
			if (passwd[i] == '\r' || passwd[i] == '\n')
				passwd[i] = '\0';
		} while (passwd[i++]);
	}

	if (timeout) {
		alarm(0);
	}

	tcsetattr(STDIN_FILENO, TCSANOW, &old);
	puts("");
	fflush(stdout);
	return ret;
}
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 <stdio.h>
12	#include <string.h>
13	#include <unistd.h>
14	#include <fcntl.h>
15	#include <signal.h>
16	#include <termios.h>
17	#include <sys/ioctl.h>
18
19	#include "libbb.h"
20
21	/* do nothing signal handler */
22	static void askpass_timeout(int ATTRIBUTE_UNUSED ignore)
23	{
24	}
25
26	char bb_askpass(int timeout, const char prompt)
27	{
28	static char passwd[64];
29
30	char *ret;
31	int i;
32	struct sigaction sa;
33	struct termios old, new;
34
35	tcgetattr(STDIN_FILENO, &old);
36	tcflush(STDIN_FILENO, TCIFLUSH);
37
38	memset(passwd, 0, sizeof(passwd));
39
40	fputs(prompt, stdout);
41	fflush(stdout);
42
43	tcgetattr(STDIN_FILENO, &new);
44	new.c_iflag &= ~(IUCLC\|IXON\|IXOFF\|IXANY);
45	new.c_lflag &= ~(ECHO\|ECHOE\|ECHOK\|ECHONL\|TOSTOP);
46	tcsetattr(STDIN_FILENO, TCSANOW, &new);
47
48	if (timeout) {
49	sa.sa_flags = 0;
50	sa.sa_handler = askpass_timeout;
51	sigaction(SIGALRM, &sa, NULL);
52	alarm(timeout);
53	}
54
55	ret = NULL;
56	if (read(STDIN_FILENO, passwd, sizeof(passwd)-1) > 0) {
57	ret = passwd;
58	i = 0;
59	/* Last byte is guaranteed to be 0
60	(read did not overwrite it) */
61	do {
62	if (passwd[i] == '\r' \|\| passwd[i] == '\n')
63	passwd[i] = '\0';
64	} while (passwd[i++]);
65	}
66
67	if (timeout) {
68	alarm(0);
69	}
70
71	tcsetattr(STDIN_FILENO, TCSANOW, &old);
72	puts("");
73	fflush(stdout);
74	return ret;
75	}