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
|
#include <u.h>
#include <libc.h>
#include <bio.h>
#define DEFGREET "Welcome to Antares Labs Computer Bulletin Board Sytem\r\n\r\n"
#define BAUDRATE 300
Biobuf bin, bout;
char *wdir = "/sys/lib/bbs";
char username[32];
int debug;
void
usage(void)
{
fprint(2, "usage: bbs [-d] [-m pwd]\n");
exits("usage");
}
void
reply(char *msg, long len)
{
char *s;
for(s = msg; (s-msg) < len; s++){
write(1, s, 1);
sleep(1000/(BAUDRATE/8));
}
}
void
greet(void)
{
char buf[1024];
int fd, n;
fd = open("greeting", OREAD);
if(fd < 0)
reply(DEFGREET, strlen(DEFGREET));
else
while((n = read(fd, buf, sizeof buf)) > 0)
reply(buf, n);
close(fd);
reply(ctime(time(0)), 30-1);
}
int
signup(void)
{
char *line, *passwd;
int len;
reply("username (32 chars max): ", 25);
line = Brdline(&bin, '\n');
len = Blinelen(&bin);
line[len-2] = 0;
strncpy(username, line, sizeof username);
reply("password: ", 10);
line = Brdline(&bin, '\n');
len = Blinelen(&bin);
line[len-2] = 0;
passwd = malloc(len);
strncpy(passwd, line, len);
}
int
login(void)
{
char *line;
int len;
reply("login: ", 7);
line = Brdline(&bin, '\n');
len = Blinelen(&bin);
line[len-2] = 0;
strncpy(username, line, sizeof username);
if(strcmp(username, "new") == 0)
signup();
return 0;
}
void
main(int argc, char *argv[])
{
char *line;
int len, i;
ARGBEGIN{
case 'm':
wdir = EARGF(usage());
break;
case 'd':
debug++;
break;
}ARGEND;
Binit(&bin, 0, OREAD);
Binit(&bout, 1, OWRITE);
if(debug)
for(i = 0; i < argc; i++)
fprint(2, "arg%d: %s\n", i, argv[i]);
if(chdir(wdir) < 0)
sysfatal("chdir: %r");
greet();
if(login() < 0){
fprint(2, "login failed for %s\n", username);
exits(0);
}
while(line = Brdline(&bin, '\n')){
if(strcmp(line, "q") == 0){
print("bye!\n");
exits(0);
}
len = Blinelen(&bin);
Bwrite(&bout, line, len);
Bflush(&bout);
}
Bterm(&bin);
Bterm(&bout);
exits(0);
}
|
