-
Notifications
You must be signed in to change notification settings - Fork 13
/
multipartparser.c
321 lines (288 loc) · 10.7 KB
/
multipartparser.c
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
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
#include "multipartparser.h"
#include <string.h>
#define CR '\r'
#define LF '\n'
#define SP ' '
#define HT '\t'
#define HYPHEN '-'
#define CALLBACK_NOTIFY(NAME) \
if (callbacks->on_##NAME != NULL) { \
if (callbacks->on_##NAME(parser) != 0) \
goto error; \
}
#define CALLBACK_DATA(NAME, P, S) \
if (callbacks->on_##NAME != NULL) { \
if (callbacks->on_##NAME(parser, P, S) != 0) \
goto error; \
}
enum state {
s_preamble,
s_preamble_hy_hy,
s_first_boundary,
s_header_field_start,
s_header_field,
s_header_value_start,
s_header_value,
s_header_value_cr,
s_headers_done,
s_data,
s_data_cr,
s_data_cr_lf,
s_data_cr_lf_hy,
s_data_boundary_start,
s_data_boundary,
s_data_boundary_done,
s_data_boundary_done_cr_lf,
s_data_boundary_done_hy_hy,
s_epilogue,
};
/* Header field name as defined by rfc 2616. Also lowercases them.
* field-name = token
* token = 1*<any CHAR except CTLs or tspecials>
* CTL = <any US-ASCII control character (octets 0 - 31) and DEL (127)>
* tspecials = "(" | ")" | "<" | ">" | "@"
* | "," | ";" | ":" | "\" | DQUOTE
* | "/" | "[" | "]" | "?" | "="
* | "{" | "}" | SP | HT
* DQUOTE = <US-ASCII double-quote mark (34)>
* SP = <US-ASCII SP, space (32)>
* HT = <US-ASCII HT, horizontal-tab (9)>
*/
static const char header_field_chars[256] = {
/* 0 nul 1 soh 2 stx 3 etx 4 eot 5 enq 6 ack 7 bel */
0, 0, 0, 0, 0, 0, 0, 0,
/* 8 bs 9 ht 10 nl 11 vt 12 np 13 cr 14 so 15 si */
0, 0, 0, 0, 0, 0, 0, 0,
/* 16 dle 17 dc1 18 dc2 19 dc3 20 dc4 21 nak 22 syn 23 etb */
0, 0, 0, 0, 0, 0, 0, 0,
/* 24 can 25 em 26 sub 27 esc 28 fs 29 gs 30 rs 31 us */
0, 0, 0, 0, 0, 0, 0, 0,
/* 32 sp 33 ! 34 " 35 # 36 $ 37 % 38 & 39 ' */
0, '!', 0, '#', '$', '%', '&', '\'',
/* 40 ( 41 ) 42 * 43 + 44 , 45 - 46 . 47 / */
0, 0, '*', '+', 0, '-', '.', 0,
/* 48 0 49 1 50 2 51 3 52 4 53 5 54 6 55 7 */
'0', '1', '2', '3', '4', '5', '6', '7',
/* 56 8 57 9 58 : 59 ; 60 < 61 = 62 > 63 ? */
'8', '9', 0, 0, 0, 0, 0, 0,
/* 64 @ 65 A 66 B 67 C 68 D 69 E 70 F 71 G */
0, 'A', 'B', 'C', 'D', 'E', 'F', 'G',
/* 72 H 73 I 74 J 75 K 76 L 77 M 78 N 79 O */
'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O',
/* 80 P 81 Q 82 R 83 S 84 T 85 U 86 V 87 W */
'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W',
/* 88 X 89 Y 90 Z 91 [ 92 \ 93 ] 94 ^ 95 _ */
'X', 'Y', 'Z', 0, 0, 0, '^', '_',
/* 96 ` 97 a 98 b 99 c 100 d 101 e 102 f 103 g */
'`', 'a', 'b', 'c', 'd', 'e', 'f', 'g',
/* 104 h 105 i 106 j 107 k 108 l 109 m 110 n 111 o */
'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o',
/* 112 p 113 q 114 r 115 s 116 t 117 u 118 v 119 w */
'p', 'q', 'r', 's', 't', 'u', 'v', 'w',
/* 120 x 121 y 122 z 123 { 124 | 125 } 126 ~ 127 del */
'x', 'y', 'z', 0, '|', 0, '~', 0
};
void multipartparser_init(multipartparser* parser, const char* boundary)
{
memset(parser, 0, sizeof(*parser));
strncpy(parser->boundary, boundary, sizeof(parser->boundary));
parser->boundary_length = strlen(parser->boundary);
parser->state = s_preamble;
}
void multipartparser_callbacks_init(multipartparser_callbacks* callbacks)
{
memset(callbacks, 0, sizeof(*callbacks));
}
size_t multipartparser_execute(multipartparser* parser,
multipartparser_callbacks* callbacks,
const char* data,
size_t size)
{
const char* mark;
const char* p;
unsigned char c;
for (p = data; p < data + size; ++p) {
c = *p;
reexecute:
switch (parser->state) {
case s_preamble:
if (c == HYPHEN)
parser->state = s_preamble_hy_hy;
// else ignore everything before first boundary
break;
case s_preamble_hy_hy:
if (c == HYPHEN)
parser->state = s_first_boundary;
else
parser->state = s_preamble;
break;
case s_first_boundary:
if (parser->index == parser->boundary_length) {
if (c != CR)
goto error;
parser->index++;
break;
}
if (parser->index == parser->boundary_length + 1) {
if (c != LF)
goto error;
CALLBACK_NOTIFY(body_begin);
CALLBACK_NOTIFY(part_begin);
parser->index = 0;
parser->state = s_header_field_start;
break;
}
if (c == parser->boundary[parser->index]) {
parser->index++;
break;
}
goto error;
case s_header_field_start:
if (c == CR) {
parser->state = s_headers_done;
break;
}
parser->state = s_header_field;
// fallthrough;
case s_header_field:
mark = p;
while (p != data + size) {
c = *p;
if (header_field_chars[c] == 0)
break;
++p;
}
if (p > mark) {
CALLBACK_DATA(header_field, mark, p - mark);
}
if (p == data + size) {
break;
}
if (c == ':') {
parser->state = s_header_value_start;
break;
}
goto error;
case s_header_value_start:
if (c == SP || c == HT) {
break;
}
parser->state = s_header_value;
// fallthrough;
case s_header_value:
mark = p;
while (p != data + size) {
c = *p;
if (c == CR) {
parser->state = s_header_value_cr;
break;
}
++p;
}
if (p > mark) {
CALLBACK_DATA(header_value, mark, p - mark);
}
break;
case s_header_value_cr:
if (c == LF) {
parser->state = s_header_field_start;
break;
}
goto error;
case s_headers_done:
if (c == LF) {
CALLBACK_NOTIFY(headers_complete);
parser->state = s_data;
break;
}
goto error;
case s_data:
mark = p;
while (p != data + size) {
c = *p;
if (c == CR) {
parser->state = s_data_cr;
break;
}
++p;
}
if (p > mark) {
CALLBACK_DATA(data, mark, p - mark);
}
break;
case s_data_cr:
if (c == LF) {
parser->state = s_data_cr_lf;
break;
}
CALLBACK_DATA(data, "\r", 1);
parser->state = s_data;
goto reexecute;
case s_data_cr_lf:
if (c == HYPHEN) {
parser->state = s_data_cr_lf_hy;
break;
}
CALLBACK_DATA(data, "\r\n", 2);
parser->state = s_data;
goto reexecute;
case s_data_cr_lf_hy:
if (c == HYPHEN) {
parser->state = s_data_boundary_start;
break;
}
CALLBACK_DATA(data, "\r\n-", 3);
parser->state = s_data;
goto reexecute;
case s_data_boundary_start:
parser->index = 0;
parser->state = s_data_boundary;
// fallthrough;
case s_data_boundary:
if (parser->index == parser->boundary_length) {
parser->index = 0;
parser->state = s_data_boundary_done;
goto reexecute;
}
if (c == parser->boundary[parser->index]) {
parser->index++;
break;
}
CALLBACK_DATA(data, parser->boundary, parser->index);
parser->state = s_data;
goto reexecute;
case s_data_boundary_done:
if (c == CR) {
parser->state = s_data_boundary_done_cr_lf;
break;
}
if (c == HYPHEN) {
parser->state = s_data_boundary_done_hy_hy;
break;
}
goto error;
case s_data_boundary_done_cr_lf:
if (c == LF) {
CALLBACK_NOTIFY(part_end);
CALLBACK_NOTIFY(part_begin);
parser->state = s_header_field_start;
break;
}
goto error;
case s_data_boundary_done_hy_hy:
if (c == HYPHEN) {
CALLBACK_NOTIFY(part_end);
CALLBACK_NOTIFY(body_end);
parser->state = s_epilogue;
break;
}
goto error;
case s_epilogue:
// Must be ignored according to rfc 1341.
break;
}
}
return size;
error:
return p - data;
}