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
193
194
195
|
#include "includes.h"
RCSID("$Id: cli.c,v 1.1 2000/10/14 05:23:12 djm Exp $");
#include "xmalloc.h"
#include "ssh.h"
static int cli_input = -1;
static int cli_output = -1;
static int cli_from_stdin = 0;
sigset_t oset;
sigset_t nset;
struct sigaction nsa;
struct sigaction osa;
struct termios ntio;
struct termios otio;
int echo_modified;
volatile int intr;
static int
cli_open(int from_stdin)
{
if (cli_input >= 0 && cli_output >= 0 && cli_from_stdin == from_stdin)
return 1;
if (from_stdin) {
if (!cli_from_stdin && cli_input >= 0) {
(void)close(cli_input);
}
cli_input = STDIN_FILENO;
cli_output = STDERR_FILENO;
} else {
cli_input = cli_output = open("/dev/tty", O_RDWR);
if (cli_input < 0)
fatal("You have no controlling tty. Cannot read passphrase.");
}
cli_from_stdin = from_stdin;
return cli_input >= 0 && cli_output >= 0 && cli_from_stdin == from_stdin;
}
static void
cli_close()
{
if (!cli_from_stdin && cli_input >= 0)
close(cli_input);
cli_input = -1;
cli_output = -1;
cli_from_stdin = 0;
return;
}
void
intrcatch()
{
intr = 1;
}
static void
cli_echo_disable()
{
sigemptyset(&nset);
sigaddset(&nset, SIGTSTP);
(void) sigprocmask(SIG_BLOCK, &nset, &oset);
intr = 0;
memset(&nsa, 0, sizeof(nsa));
nsa.sa_handler = intrcatch;
(void) sigaction(SIGINT, &nsa, &osa);
echo_modified = 0;
if (tcgetattr(cli_input, &otio) == 0 && (otio.c_lflag & ECHO)) {
echo_modified = 1;
ntio = otio;
ntio.c_lflag &= ~(ECHO | ECHOE | ECHOK | ECHONL);
(void) tcsetattr(cli_input, TCSANOW, &ntio);
}
return;
}
static void
cli_echo_restore()
{
if (echo_modified != 0) {
tcsetattr(cli_input, TCSANOW, &otio);
echo_modified = 0;
}
(void) sigprocmask(SIG_SETMASK, &oset, NULL);
(void) sigaction(SIGINT, &osa, NULL);
if (intr != 0) {
kill(getpid(), SIGINT);
sigemptyset(&nset);
/* XXX tty has not neccessarily drained by now? */
sigsuspend(&nset);
intr = 0;
}
return;
}
static int
cli_read(char* buf, int size, int echo)
{
char ch = 0;
int i = 0;
if (!echo)
cli_echo_disable();
while (ch != '\n') {
if (read(cli_input, &ch, 1) != 1)
break;
if (ch == '\n' || intr != 0)
break;
if (i < size)
buf[i++] = ch;
}
buf[i] = '\0';
if (!echo)
cli_echo_restore();
if (!intr && !echo)
(void) write(cli_output, "\n", 1);
return i;
}
static int
cli_write(char* buf, int size)
{
int i, len, pos, ret = 0;
char *output, *p;
output = xmalloc(4*size);
for (p = output, i = 0; i < size; i++) {
if (buf[i] == '\n')
*p++ = buf[i];
else
p = vis(p, buf[i], 0, 0);
}
len = p - output;
for (pos = 0; pos < len; pos += ret) {
ret = write(cli_output, output + pos, len - pos);
if (ret == -1)
return -1;
}
return 0;
}
/*
* Presents a prompt and returns the response allocated with xmalloc().
* Uses /dev/tty or stdin/out depending on arg. Optionally disables echo
* of response depending on arg. Tries to ensure that no other userland
* buffer is storing the response.
*/
char*
cli_read_passphrase(char* prompt, int from_stdin, int echo_enable)
{
char buf[BUFSIZ];
char* p;
if (!cli_open(from_stdin))
fatal("Cannot read passphrase.");
fflush(stdout);
cli_write(prompt, strlen(prompt));
cli_read(buf, sizeof buf, echo_enable);
cli_close();
p = xstrdup(buf);
memset(buf, 0, sizeof(buf));
return (p);
}
char*
cli_prompt(char* prompt, int echo_enable)
{
return cli_read_passphrase(prompt, 0, echo_enable);
}
void
cli_mesg(char* mesg)
{
cli_open(0);
cli_write(mesg, strlen(mesg));
cli_write("\n", strlen("\n"));
cli_close();
return;
}
|
