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
|
/*
* Copyright 2008 Rob Kendrick <rjek@netsurf-browser.org>
*
* This file is part of NetSurf.
*
* NetSurf is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* NetSurf is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/* data: URL handling. See http://tools.ietf.org/html/rfc2397 */
#define _GNU_SOURCE
#include <assert.h>
#include <errno.h>
#include <stdbool.h>
#include <string.h>
#include <strings.h>
#include <time.h>
#include <sys/select.h>
#include <sys/stat.h>
#include <sys/utsname.h>
#include <curl/curl.h> /* for URL unescaping functions */
#include "utils/config.h"
#include "content/fetch.h"
#include "content/fetchers/fetch_data.h"
#include "content/urldb.h"
#include "desktop/netsurf.h"
#include "desktop/options.h"
#include "render/form.h"
#include "utils/log.h"
#include "utils/messages.h"
#include "utils/url.h"
#include "utils/utils.h"
#include "utils/ring.h"
#include "utils/base64.h"
struct fetch_data_context {
struct fetch *parent_fetch;
char *url;
char *mimetype;
char *data;
size_t datalen;
bool base64;
struct fetch_data_context *r_next, *r_prev;
};
static struct fetch_data_context *ring = NULL;
static bool fetch_data_initialise(const char *scheme)
{
LOG(("fetch_data_initialise called for %s", scheme));
return true;
}
static void fetch_data_finalise(const char *scheme)
{
LOG(("fetch_data_finalise called for %s", scheme));
}
static void *fetch_data_setup(struct fetch *parent_fetch, const char *url,
bool only_2xx, const char *post_urlenc,
struct form_successful_control *post_multipart,
const char **headers)
{
struct fetch_data_context *ctx = calloc(1, sizeof(*ctx));
RING_INSERT(ring, ctx);
ctx->parent_fetch = parent_fetch;
ctx->url = strdup(url);
return ctx;
}
static bool fetch_data_start(void *ctx)
{
struct fetch_data_context *c = ctx;
char *params;
char *comma;
/* format of a data: URL is:
* data:[<mimetype>][;base64],<data>
* The mimetype is optional. If it is missing, the , before the
* data must still be there.
*/
/* skip the data: part */
params = c->url + sizeof("data:") - 1;
/* find the comma */
if ( (comma = strchr(params, ',')) == NULL) {
fetch_send_callback(FETCH_ERROR, c->parent_fetch,
"Badly formed data: URL", 0);
return false;
}
if (params[0] == ',') {
/* there is no mimetype here, assume text/plain */
c->mimetype = strdup("text/plain;charset=US-ASCII");
} else {
/* make a copy of everything between data: and the comma */
c->mimetype = strndup(params, comma - params);
}
if (c->mimetype == NULL) {
fetch_send_callback(FETCH_ERROR, c->parent_fetch,
"Unable to allocate memory for mimetype in data: URL",
0);
return false;
}
if (strcmp(c->mimetype + strlen(c->mimetype) - 7, ";base64") == 0) {
c->base64 = true;
c->mimetype[strlen(c->mimetype) - 7] = '\0';
} else {
c->base64 = false;
}
if (c->base64) {
/* content is base64-encoded. Decode it. */
c->datalen = strlen(c->url);
c->data = malloc(c->datalen); /* safe: gets smaller */
if (base64_decode(comma + 1, strlen(comma + 1), c->data,
&(c->datalen)) == false) {
fetch_send_callback(FETCH_ERROR, c->parent_fetch,
"Invalid Base64 encoding in data: URL", 0);
return false;
}
} else {
CURL *curl = curl_easy_init();
c->data = curl_easy_unescape(curl, comma + 1,
0, (int *)&c->datalen);
curl_easy_cleanup(curl);
if (c->data == NULL) {
fetch_send_callback(FETCH_ERROR, c->parent_fetch,
"Invalid URL encoding in data: URL", 0);
return false;
}
}
return true;
}
static void fetch_data_abort(void *ctx)
{
struct fetch_data_context *c = ctx;
fetch_remove_from_queues(c->parent_fetch);
}
static void fetch_data_free(void *ctx)
{
struct fetch_data_context *c = ctx;
free(c->url);
free(c->data);
free(c->mimetype);
RING_REMOVE(ring, c);
free(ctx);
}
static void fetch_data_poll(const char *scheme)
{
struct fetch_data_context *c = ring;
struct cache_data cachedata;
if (c == NULL) return;
cachedata.req_time = time(NULL);
cachedata.res_time = time(NULL);
cachedata.date = 0;
cachedata.expires = 0;
cachedata.age = INVALID_AGE;
cachedata.max_age = 0;
cachedata.no_cache = true;
cachedata.etag = NULL;
cachedata.last_modified = 0;
fetch_set_http_code(c->parent_fetch, 200);
fetch_send_callback(FETCH_TYPE, c->parent_fetch, c->mimetype,
c->datalen);
fetch_send_callback(FETCH_DATA, c->parent_fetch,
c->data, c->datalen);
fetch_send_callback(FETCH_FINISHED, c->parent_fetch, &cachedata, 0);
fetch_remove_from_queues(c->parent_fetch);
fetch_free(c->parent_fetch);
}
void fetch_data_register(void)
{
fetch_add_fetcher("data",
fetch_data_initialise,
fetch_data_setup,
fetch_data_start,
fetch_data_abort,
fetch_data_free,
fetch_data_poll,
fetch_data_finalise);
}
|
