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
|
/*
* FCRON - periodic command scheduler
*
* Copyright 2000-2006 Thibault Godouet <fcron@free.fr>
*
* 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 of the License, 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
*
* The GNU General Public License can also be found in the file
* `LICENSE' that comes with the fcron source distribution.
*/
/* $Id: read_string.c,v 1.3 2006/01/11 00:49:29 thib Exp thib $ */
/* read a string (password, etc ...) securely from a tty */
#include "global.h"
#include "read_string.h"
#include "log.h"
extern char debug_opt;
/* Derived from Andrew Morgan <morgan@linux.kernel.org> work in Linux PAM misc lib. */
/* may be used in fcrondyn without pam : */
#ifndef HAVE_LIBPAM
#define PAM_MAX_MSG_SIZE LINE_LEN
#endif
char *read_string(int echo, const char *prompt)
/* read a line of input string, giving prompt when appropriate */
{
struct termios term_before, term_tmp;
char line[PAM_MAX_MSG_SIZE];
int nc, have_term=0;
debug("called with echo='%s', prompt='%s'.", echo ? "ON":"OFF" , prompt);
if (isatty(STDIN_FILENO)) { /* terminal state */
/* is a terminal so record settings and flush it */
if ( tcgetattr(STDIN_FILENO, &term_before) != 0 ) {
debug("error: failed to get terminal settings");
return NULL;
}
memcpy(&term_tmp, &term_before, sizeof(term_tmp));
if (!echo)
term_tmp.c_lflag &= ~(ECHO);
have_term = 1;
}
else if (!echo)
debug("warning: cannot turn echo off");
/* reading the line */
while (1) {
fprintf(stderr, "%s", prompt);
/* this may, or may not set echo off -- drop pending input */
if (have_term)
(void) tcsetattr(STDIN_FILENO, TCSAFLUSH, &term_tmp);
nc = read(STDIN_FILENO, line, sizeof(line)-1);
if (have_term) {
(void) tcsetattr(STDIN_FILENO, TCSADRAIN, &term_before);
if (!echo) /* do we need a newline? */
fprintf(stderr,"\n");
}
if (nc > 0) { /* we got some user input */
char *input;
if (nc > 0 && line[nc-1] == '\n') { /* <NUL> terminate */
line[--nc] = '\0';
} else {
line[nc] = '\0';
}
input = ( (line) ? strdup(line):NULL );
Overwrite(line);
return input; /* return malloc()ed string */
} else if (nc == 0) { /* Ctrl-D */
debug("user did not want to type anything");
fprintf(stderr, "\n");
break;
}
}
if (have_term)
(void) tcsetattr(STDIN_FILENO, TCSADRAIN, &term_before);
memset(line, 0, PAM_MAX_MSG_SIZE); /* clean up */
return NULL;
}
|
