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
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
|
/* $OpenBSD: server_file.c,v 1.13 2014/07/25 13:10:18 reyk Exp $ */
/*
* Copyright (c) 2006 - 2014 Reyk Floeter <reyk@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/queue.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/tree.h>
#include <sys/hash.h>
#include <net/if.h>
#include <netinet/in_systm.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <stdio.h>
#include <err.h>
#include <event.h>
#include <openssl/ssl.h>
#include "httpd.h"
#include "http.h"
int server_file_access(struct http_descriptor *, char *, size_t,
struct stat *);
void server_file_error(struct bufferevent *, short, void *);
int
server_file_access(struct http_descriptor *desc, char *path, size_t len,
struct stat *st)
{
errno = 0;
if (access(path, R_OK) == -1) {
goto fail;
} else if (stat(path, st) == -1) {
goto fail;
} else if (S_ISDIR(st->st_mode)) {
/* XXX Should we support directory listing? */
if (!len) {
/* Recursion - the index "file" is a directory? */
errno = EINVAL;
goto fail;
}
/* Redirect to path with trailing "/" */
if (path[strlen(path) - 1] != '/') {
/* Remove the document root to get the relative URL */
if (canonicalize_path(NULL,
desc->http_path, path, len) == NULL ||
strlcat(path, "/", len) >= len) {
errno = EINVAL;
goto fail;
}
/* Indicate that the file has been moved */
return (301);
}
/* Otherwise append the default index file */
if (strlcat(path, HTTPD_INDEX, len) >= len) {
errno = EACCES;
goto fail;
}
/* Check again but set len to 0 to avoid recursion */
return (server_file_access(desc, path, 0, st));
} else if (!S_ISREG(st->st_mode)) {
/* Don't follow symlinks and ignore special files */
errno = EACCES;
goto fail;
}
return (0);
fail:
/* Remove the document root */
if (len && canonicalize_path(NULL, desc->http_path, path, len) == NULL)
return (500);
switch (errno) {
case ENOENT:
return (404);
case EACCES:
return (403);
default:
return (500);
}
/* NOTREACHED */
}
int
server_file(struct httpd *env, struct client *clt)
{
struct http_descriptor *desc = clt->clt_desc;
struct server_config *srv_conf = clt->clt_srv_conf;
struct media_type *media;
const char *errstr = NULL;
int fd = -1, ret;
char path[MAXPATHLEN];
struct stat st;
if (canonicalize_path(srv_conf->docroot,
desc->http_path, path, sizeof(path)) == NULL) {
/* Do not echo the uncanonicalized path */
server_abort_http(clt, 500, "invalid request path");
return (-1);
}
/* Returns HTTP status code on error */
if ((ret = server_file_access(desc, path, sizeof(path), &st)) != 0) {
server_abort_http(clt, ret, path);
return (-1);
}
/* Now open the file, should be readable or we have another problem */
if ((fd = open(path, O_RDONLY)) == -1)
goto fail;
/* File descriptor is opened, decrement inflight counter */
server_inflight_dec(clt, __func__);
media = media_find(env->sc_mediatypes, path);
ret = server_response_http(clt, 200, media, st.st_size);
switch (ret) {
case -1:
goto fail;
case 0:
/* Connection is already finished */
close(fd);
return (0);
default:
break;
}
clt->clt_fd = fd;
if (clt->clt_file != NULL)
bufferevent_free(clt->clt_file);
clt->clt_file = bufferevent_new(clt->clt_fd, server_read,
server_write, server_file_error, clt);
if (clt->clt_file == NULL) {
errstr = "failed to allocate file buffer event";
goto fail;
}
bufferevent_settimeout(clt->clt_file,
srv_conf->timeout.tv_sec, srv_conf->timeout.tv_sec);
bufferevent_enable(clt->clt_file, EV_READ);
bufferevent_disable(clt->clt_bev, EV_READ);
return (0);
fail:
if (errstr == NULL)
errstr = strerror(errno);
server_abort_http(clt, 500, errstr);
return (-1);
}
void
server_file_error(struct bufferevent *bev, short error, void *arg)
{
struct client *clt = arg;
struct evbuffer *dst;
if (error & EVBUFFER_TIMEOUT) {
server_close(clt, "buffer event timeout");
return;
}
if (error & (EVBUFFER_READ|EVBUFFER_WRITE|EVBUFFER_EOF)) {
bufferevent_disable(bev, EV_READ);
clt->clt_done = 1;
dst = EVBUFFER_OUTPUT(clt->clt_bev);
if (EVBUFFER_LENGTH(dst)) {
/* Finish writing all data first */
bufferevent_enable(clt->clt_bev, EV_WRITE);
return;
}
if (clt->clt_persist) {
/* Close input file and wait for next HTTP request */
if (clt->clt_fd != -1)
close(clt->clt_fd);
clt->clt_fd = -1;
clt->clt_toread = TOREAD_HTTP_HEADER;
server_reset_http(clt);
bufferevent_enable(clt->clt_bev, EV_READ|EV_WRITE);
return;
}
server_close(clt, "done");
return;
}
if (error & EVBUFFER_ERROR && errno == EFBIG) {
bufferevent_enable(bev, EV_READ);
return;
}
server_close(clt, "buffer event error");
return;
}
|
