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
|
#include "core.h"
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <syslog.h>
#include <sys/ioctl.h>
#include <netinet/in.h>
#include <ifaddrs.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <netinet/tcp.h>
#include <fcntl.h>
#include <time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/sendfile.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <limits.h>
#include <errno.h>
static int tip_client_method_not_found(struct tip_client *cli)
{
/* To meet RFC 7231, this function MUST generate an Allow header field
* containing the correct methods. For example: "Allow: POST\r\n"
*/
char buf[] = "HTTP/1.1 405 Method Not Allowed\r\n"
"Content-Length: 0\r\n\r\n";
send(tip_client_socket(cli), buf, strlen(buf), 0);
return -1;
}
static int tip_client_file_not_found(struct tip_client *cli)
{
char buf[] = "HTTP/1.1 404 Not Found\r\n"
"Content-Length: 0\r\n\r\n";
send(tip_client_socket(cli), buf, strlen(buf), 0);
return -1;
}
/* TODO: sanitize uri, don't escape directory serving files. */
static bool sanitize(const char *uri)
{
return true;
}
#define BLOCK 1024000
int tip_client_state_process_payload(struct tip_client *cli)
{
const char *trailer, *x_redirect;
enum tip_http_method method;
bool allow_redirect = true;
char _uri[32], *uri = _uri;
char path[PATH_MAX + 1];
char redirect[5];
struct stat st;
int err;
/* syslog(LOG_DEBUG, "%s:rhu %.32s ...\n",
inet_ntoa(cli->addr.sin_addr),
ntohs(cli->addr.sin_port), cli->buf); */
if (!strncmp(cli->buf, "GET", strlen("GET"))) {
method = TIP_METHOD_GET;
if (sscanf(cli->buf, "GET %31s HTTP/1.1", uri) != 1)
return tip_client_method_not_found(cli);
} else {
return tip_client_method_not_found(cli);
}
x_redirect = strstr(cli->buf, "X-Accept-Redirect: ");
if (x_redirect &&
sscanf(x_redirect, "X-Accept-Redirect: %4s", redirect) == 1 &&
!strncmp(redirect, "off", strlen("off")))
allow_redirect = false;
trailer = strstr(cli->buf, "\r\n\r\n");
if (!sanitize(uri))
return tip_client_method_not_found(cli);
snprintf(path, PATH_MAX, "%s/%s", root, uri);
err = stat(path, &st);
if (err < 0)
return tip_client_file_not_found(cli);
/* skip initial / */
uri++;
cli->uri = strdup(uri);
cli->path = strdup(path);
cli->size = st.st_size;
cli->allow_redirect = allow_redirect;
num_clients++;
if (tip_client_large_file(cli) && num_clients > max_clients) {
if (!tip_client_redirect(cli)) {
tip_client_pending(cli);
return 1;
}
}
cli->state = TIP_CLIENT_PROCESSING_REQUEST_2;
return 0;
}
int tip_client_state_process_payload_reply(struct tip_client *cli)
{
char buf[1024];
int fd;
if (cli->redirect) {
snprintf(buf, sizeof(buf),
"HTTP/1.1 301 Moves Permanently\r\nLocation: http://%s:%hu/%s\r\n\r\n",
inet_ntoa(cli->redirect_addr.sin_addr),
htons(cli->redirect_addr.sin_port), cli->uri);
send(tip_client_socket(cli), buf, strlen(buf), 0);
return 1;
}
fd = open(cli->path, O_RDONLY);
if (fd < 0)
return tip_client_file_not_found(cli);
snprintf(buf, sizeof(buf),
"HTTP/1.1 200 OK\r\nContent-Length: %lu\r\n\r\n",
cli->size);
send(tip_client_socket(cli), buf, strlen(buf), 0);
cli->fd = fd;
cli->state = TIP_CLIENT_PROCESSING_REQUEST_3;
return 0;
}
int tip_client_state_process_payload_bulk(struct tip_client *cli)
{
sendfile(tip_client_socket(cli), cli->fd, &cli->offset, BLOCK);
if (cli->offset >= cli->size)
return 1;
return 0;
}
|
