1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
|
/* Copyright (C) 1992-2001, 2003 Free Software Foundation, Inc.
This file is part of the GNU C Library.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation,
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#if HAVE_CONFIG_H
# include <config.h>
#endif
#if _LIBC
# define HAVE_STDIO_EXT_H 1
#endif
#include <stdbool.h>
#include <stdio.h>
#if HAVE_STDIO_EXT_H
# include <stdio_ext.h>
#else
# define __fsetlocking(stream, type) /* empty */
#endif
#if !_LIBC
# include "getline.h"
#endif
#include <termios.h>
#include <unistd.h>
#if _LIBC
# include <wchar.h>
#endif
#if _LIBC
# define NOTCANCEL_MODE "c"
#else
# define NOTCANCEL_MODE
#endif
#if _LIBC
# define flockfile(s) _IO_flockfile (s)
# define funlockfile(s) _IO_funlockfile (s)
#else
# include "unlocked-io.h"
#endif
#if _LIBC
# include <bits/libc-lock.h>
#else
# define __libc_cleanup_push(function, arg) /* empty */
# define __libc_cleanup_pop(execute) /* empty */
#endif
#if !_LIBC
# define __getline getline
# define __tcgetattr tcgetattr
#endif
/* It is desirable to use this bit on systems that have it.
The only bit of terminal state we want to twiddle is echoing, which is
done in software; there is no need to change the state of the terminal
hardware. */
#ifndef TCSASOFT
# define TCSASOFT 0
#endif
static void
call_fclose (void *arg)
{
if (arg != NULL)
fclose (arg);
}
char *
getpass (const char *prompt)
{
FILE *tty;
FILE *in, *out;
struct termios s, t;
bool tty_changed;
static char *buf;
static size_t bufsize;
ssize_t nread;
/* Try to write to and read from the terminal if we can.
If we can't open the terminal, use stderr and stdin. */
tty = fopen ("/dev/tty", "w+" NOTCANCEL_MODE);
if (tty == NULL)
{
in = stdin;
out = stderr;
}
else
{
/* We do the locking ourselves. */
__fsetlocking (tty, FSETLOCKING_BYCALLER);
out = in = tty;
}
/* Make sure the stream we opened is closed even if the thread is
canceled. */
__libc_cleanup_push (call_fclose, tty);
flockfile (out);
/* Turn echoing off if it is on now. */
if (__tcgetattr (fileno (in), &t) == 0)
{
/* Save the old one. */
s = t;
/* Tricky, tricky. */
t.c_lflag &= ~(ECHO|ISIG);
tty_changed = (tcsetattr (fileno (in), TCSAFLUSH|TCSASOFT, &t) == 0);
}
else
tty_changed = false;
/* Write the prompt. */
#ifdef USE_IN_LIBIO
if (_IO_fwide (out, 0) > 0)
__fwprintf (out, L"%s", prompt);
else
#endif
fputs_unlocked (prompt, out);
fflush_unlocked (out);
/* Read the password. */
nread = __getline (&buf, &bufsize, in);
#if !_LIBC
/* As far as is known, glibc doesn't need this no-op fseek. */
/* According to the C standard, input may not be followed by output
on the same stream without an intervening call to a file
positioning function. Suppose in == out; then without this fseek
call, on Solaris, HP-UX, AIX, OSF/1, the previous input gets
echoed, whereas on IRIX, the following newline is not output as
it should be. POSIX imposes similar restrictions if fileno (in)
== fileno (out). The POSIX restrictions are tricky and change
from POSIX version to POSIX version, so play it safe and invoke
fseek even if in != out. */
fseek (out, 0, SEEK_CUR);
#endif
if (buf != NULL)
{
if (nread < 0)
buf[0] = '\0';
else if (buf[nread - 1] == '\n')
{
/* Remove the newline. */
buf[nread - 1] = '\0';
if (tty_changed)
{
/* Write the newline that was not echoed. */
#ifdef USE_IN_LIBIO
if (_IO_fwide (out, 0) > 0)
putwc_unlocked (L'\n', out);
else
#endif
putc_unlocked ('\n', out);
}
}
}
/* Restore the original setting. */
if (tty_changed)
(void) tcsetattr (fileno (in), TCSAFLUSH|TCSASOFT, &s);
funlockfile (out);
__libc_cleanup_pop (0);
call_fclose (tty);
return buf;
}
|
