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
|
/*
* uhttpd - Tiny single-threaded httpd
*
* Copyright (C) 2015 Felix Fietkau <nbd@openwrt.org>
*
* Permission to use, copy, modify, and/or 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 <libubox/blobmsg.h>
#include <libubox/blobmsg_json.h>
#include <libubox/json_script.h>
#include "uhttpd.h"
struct handler {
struct list_head list;
struct json_script_file *request;
struct json_script_file *fallback;
};
static LIST_HEAD(handlers);
static struct json_script_ctx handler_ctx;
static struct env_var *cur_vars;
static struct blob_buf b;
static int handler_ret;
static struct client *cur_client;
static char **cur_url;
static void
handle_redirect(struct json_script_ctx *ctx, struct blob_attr *data)
{
struct client *cl = cur_client;
static struct blobmsg_policy policy = {
.type = BLOBMSG_TYPE_STRING,
};
struct blob_attr *tb;
blobmsg_parse_array(&policy, 1, &tb, blobmsg_data(data), blobmsg_data_len(data));
if (!tb)
return;
uh_http_header(cl, 302, "Found");
ustream_printf(cl->us, "Content-Length: 0\r\n");
ustream_printf(cl->us, "Location: %s\r\n\r\n",
blobmsg_get_string(tb));
uh_request_done(cl);
*cur_url = NULL;
handler_ret = 1;
json_script_abort(ctx);
}
static void
handle_set_uri(struct json_script_ctx *ctx, struct blob_attr *data)
{
struct client *cl = cur_client;
static struct blobmsg_policy policy = {
.type = BLOBMSG_TYPE_STRING,
};
struct blob_attr *tb;
struct blob_attr *old_url = blob_data(cl->hdr.head);
blobmsg_parse_array(&policy, 1, &tb, blobmsg_data(data), blobmsg_data_len(data));
if (!tb)
return;
blob_buf_init(&b, 0);
blob_put_raw(&b, blob_next(old_url), blob_len(cl->hdr.head) - blob_pad_len(old_url));
/* replace URL in client header cache */
blob_buf_init(&cl->hdr, 0);
blobmsg_add_string(&cl->hdr, "URL", blobmsg_get_string(tb));
blob_put_raw(&cl->hdr, blob_data(b.head), blob_len(b.head));
*cur_url = blobmsg_data(blob_data(cl->hdr.head));
cur_vars = NULL;
blob_buf_init(&b, 0);
handler_ret = 1;
json_script_abort(ctx);
}
static void
handle_command(struct json_script_ctx *ctx, const char *name,
struct blob_attr *data, struct blob_attr *vars)
{
static const struct {
const char *name;
void (*func)(struct json_script_ctx *ctx, struct blob_attr *data);
} cmds[] = {
{ "redirect", handle_redirect },
{ "set_uri", handle_set_uri }
};
int i;
for (i = 0; i < ARRAY_SIZE(cmds); i++) {
if (!strcmp(cmds[i].name, name)) {
cmds[i].func(ctx, data);
return;
}
}
}
static const char *
handle_var(struct json_script_ctx *ctx, const char *name,
struct blob_attr *vars)
{
struct client *cl = cur_client;
struct env_var *cur;
static struct path_info empty_path;
if (!cur_vars) {
struct path_info *p = uh_path_lookup(cl, *cur_url);
if (!p)
p = &empty_path;
cur_vars = uh_get_process_vars(cl, p);
}
for (cur = cur_vars; cur->name; cur++) {
if (!strcmp(cur->name, name))
return cur->value;
}
return NULL;
}
static void
handler_init(void)
{
if (handler_ctx.handle_command)
return;
json_script_init(&handler_ctx);
handler_ctx.handle_command = handle_command;
handler_ctx.handle_var = handle_var;
}
static bool set_handler(struct json_script_file **dest, struct blob_attr *data)
{
if (!data)
return true;
*dest = json_script_file_from_blobmsg(NULL, blobmsg_data(data), blobmsg_data_len(data));
return *dest;
}
int uh_handler_add(const char *file)
{
enum {
H_REQUEST,
H_FALLBACK,
__H_MAX,
};
struct blobmsg_policy policy[__H_MAX] = {
[H_REQUEST] = { "request", BLOBMSG_TYPE_ARRAY },
[H_FALLBACK] = { "fallback", BLOBMSG_TYPE_ARRAY },
};
struct blob_attr *tb[__H_MAX];
struct handler *h;
handler_init();
blob_buf_init(&b, 0);
if (!blobmsg_add_json_from_file(&b, file))
return -1;
blobmsg_parse(policy, __H_MAX, tb, blob_data(b.head), blob_len(b.head));
if (!tb[H_REQUEST] && !tb[H_FALLBACK])
return -1;
h = calloc(1, sizeof(*h));
if (!set_handler(&h->request, tb[H_REQUEST]) ||
!set_handler(&h->fallback, tb[H_FALLBACK])) {
free(h->request);
free(h->fallback);
free(h);
return -1;
}
list_add_tail(&h->list, &handlers);
return 0;
}
int uh_handler_run(struct client *cl, char **url, bool fallback)
{
struct json_script_file *f;
struct handler *h;
cur_client = cl;
cur_url = url;
cur_vars = NULL;
handler_ret = 0;
list_for_each_entry(h, &handlers, list) {
f = fallback ? h->fallback : h->request;
if (!f)
continue;
blob_buf_init(&b, 0);
json_script_run_file(&handler_ctx, f, b.head);
if (handler_ctx.abort)
break;
}
return handler_ret;
}
|
