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
|
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <termios.h>
#ifdef TCSASOFT
# define _T_FLUSH (TCSAFLUSH|TCSASOFT)
#else
# define _T_FLUSH (TCSAFLUSH)
#endif
#include "user_entry.h"
void clear_entry ( user_entry *en)
{
if( en->passwd != NULL ) {
memset(en->passwd, 0, strlen(en->passwd) );
free(en->passwd);
}
free(en->login);
}
char * askLogin()
{
int input = 0; /* stdin */
int output = 2; /* stderr */
char s[32];
char *ret;
int i = 0;
char c;
struct termios term, oterm;
static const char prom[]="DCAP user Authentication\nLogin: ";
write(output, prom, strlen(prom));
/* Turn off echo if possible. */
if (tcgetattr(input, &oterm) == 0) {
memcpy(&term, &oterm, sizeof(term));
(void)tcsetattr(input, _T_FLUSH, &term);
} else {
memset(&term, 0, sizeof(term));
memset(&oterm, 0, sizeof(oterm));
}
do {
read(input, &c, 1);
s[i++] = c;
} while (c != '\n');
s[i-1] = '\0'; /* last character new-line */
/* Restore old terminal settings and signals. */
if (memcmp(&term, &oterm, sizeof(term)) != 0) {
(void)tcsetattr(input, _T_FLUSH, &oterm);
}
ret = strdup(s);
memset(s, 0, strlen(s) );
return ret;
}
char * askPassword()
{
int input = 0; /* stdin */
int output = 2; /* stderr */
char s[32];
char *ret;
int i = 0;
char c;
struct termios term, oterm;
static const char prom[]="Password: ";
write(output, prom, strlen(prom));
/* Turn off echo if possible. */
if (tcgetattr(input, &oterm) == 0) {
memcpy(&term, &oterm, sizeof(term));
term.c_lflag &= ~(ECHO | ECHONL);
(void)tcsetattr(input, _T_FLUSH, &term);
} else {
memset(&term, 0, sizeof(term));
memset(&oterm, 0, sizeof(oterm));
}
do {
read(input, &c, 1);
s[i++] = c;
} while (c != '\n');
if (!(term.c_lflag & ECHO)) {
(void)write(output, "\n", 1);
}
s[i-1] = '\0'; /* last character new-line */
/* Restore old terminal settings and signals. */
if (memcmp(&term, &oterm, sizeof(term)) != 0) {
(void)tcsetattr(input, _T_FLUSH, &oterm);
}
ret = strdup(s);
memset(s, 0, strlen(s) );
return ret;
}
user_entry * getUserEntry()
{
user_entry *ue;
ue = (user_entry *)malloc(sizeof(user_entry));
fprintf(stderr, "\n"); fflush(stderr);
ue->login = askLogin();
ue->passwd = askPassword();
return ue;
}
#if 0
int
main() {
user_entry *ue;
ue = getUserEntry();
printf("User = %s\n", ue->login == NULL ? "NULL" : ue->login);
printf("Pass = %s\n", ue->passwd == NULL ? "NULL" : ue->passwd);
clear_entry(ue);
}
#endif
|
