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
|
/* garbage httpd, just to see if it works
* easily DoSable (like the rest of the network stack), vulnerable to path traversal, etc */
#include <camellia/flags.h>
#include <camellia/syscalls.h>
#include <err.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
static void handle(FILE *c) {
char buf[2048];
fgets(buf, sizeof buf, c);
printf("%s", buf);
if (memcmp(buf, "GET /", 5) != 0) {
fprintf(c, "HTTP/1.1 400 Bad Request\r\n\r\n");
return;
}
char *path = buf + 4;
char *end = strchr(path, ' ');
if (end) *end = '\0';
hid_t h = _sys_open(path, strlen(path), OPEN_READ);
if (h < 0) {
fprintf(c, "HTTP/1.1 404 Not Found\r\n\r\n");
return;
}
FILE *f = fdopen(h, "r");
if (!f) {
fprintf(c, "HTTP/1.1 500 Internal Server Error\r\n\r\n");
return;
}
if (path[strlen(path) - 1] != '/') {
/* regular file */
fprintf(c, "HTTP/1.1 200 OK\r\n");
fprintf(c, "\r\n");
for (;;) {
int len = fread(buf, 1, sizeof buf, f);
if (len <= 0) break;
fwrite(buf, 1, len, c);
}
} else {
/* directory listing */
fprintf(c, "HTTP/1.1 200 OK\r\n");
fprintf(c, "Content-Type: text/html; charset=UTF-8\r\n");
fprintf(c, "\r\n");
fprintf(c, "<h1>directory listing for %s</h1><hr><ul><li><a href=..>..</a></li>", path);
for (;;) {
int len = fread(buf, 1, sizeof buf, f);
if (len <= 0) break;
// TODO directory library
// based on find.c
for (int pos = 0; pos < len; ) {
if (buf[pos] == '\0') break;
const char *end = memchr(buf + pos, 0, len - pos);
if (!end) break;
fprintf(c, "<li><a href=\"%s\">%s</a></li>", buf + pos, buf + pos);
pos += end - (buf + pos) + 1;
}
}
}
fclose(f);
}
int main(int argc, char **argv) {
const char *path = (argc > 1) ? argv[1] : "/net/listen/0.0.0.0/tcp/80";
hid_t conn;
for (;;) {
conn = _sys_open(path, strlen(path), OPEN_RW);
if (conn < 0)
errx(1, "open('%s') failed, errno %d", path, -conn);
FILE *f = fdopen(conn, "a+");
handle(f);
fclose(f);
}
}
|
