-
Notifications
You must be signed in to change notification settings - Fork 2
Expand file tree
/
Copy pathParser.cpp
More file actions
453 lines (430 loc) · 13.4 KB
/
Parser.cpp
File metadata and controls
453 lines (430 loc) · 13.4 KB
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
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
#include "Parser.hpp"
#define LF (char)10
#define CR (char)13
std::vector<std::string> Parser::getParameters()
{
std::vector<std::string> result;
std::map<std::string, std::string>::iterator it = KVMap.begin();
for( ; it!=KVMap.end() ; it++)
result.push_back(it->first);
return result;
}
std::string Parser::getValueByParameter(std::string parameter)
{
std::string result;
if(KVMap.find(parameter) != KVMap.end())
result = KVMap[parameter];
return result;
}
int Parser::parse_packet()
{
pos = packet;
int ret = parse_request_line();
switch(ret) {
case HTTP_PARSE_INVALID_REQUEST:
case HTTP_PARSE_IGNORED_METHOD:
return HTTP_ERR;
default:
break;
}
for(;;)
{
ret = parse_header_line();
if (ret == HTTP_PARSE_HEADER_DONE) {
break;
}
else if (ret == HTTP_PARSE_AGAIN && HTTP_PARSE_INVALID_HEADER == ret) {
return HTTP_ERR;
}
}
return ret;
}
int Parser::parse_request_line()
{
enum {
sw_start = 0,
sw_method,
sw_spaces_before_uri,
sw_uri,
sw_http_09,
sw_http_H,
sw_http_HT,
sw_http_HTT,
sw_http_HTTP,
sw_first_major_digit,
sw_major_digit,
sw_first_minor_digit,
sw_minor_digit,
sw_spaces_after_digit,
sw_almost_done
};
uint32_t state = sw_start;
uint32_t http_minor = 0;
uint32_t http_major = 0;
char ch,*p=NULL;
char *method_start=NULL,*method_end=NULL;
char *uri_start=NULL,*uri_end=NULL;
for(p=pos; p<packet + length; p++)
{
ch=*p;
switch(state)
{
case sw_start:
if(ch<'A' || ch>'Z')
return HTTP_PARSE_INVALID_REQUEST;
method_start=p;
state = sw_method;
break;
case sw_method:
if(ch == ' ') {
method_end=p;
state = sw_spaces_before_uri;
method = std::string(method_start,method_end-method_start);
}
else
{
if(ch>'Z' || ch <'A')
return HTTP_PARSE_INVALID_REQUEST;
}
break;
case sw_spaces_before_uri:
if (ch != ' ') {
uri_start = p;
state = sw_uri;
}
break;
case sw_uri:
switch (ch) {
case ' ':
uri_end = p;
state = sw_http_09;
uri = std::string(uri_start,uri_end-uri_start);
break;
case CR:
uri_end = p;
http_minor = 9;
state = sw_almost_done;
break;
case LF:
uri_end = p;
http_minor = 9;
pos = p + 1;
version = http_major * 1000 + http_minor;
return HTTP_OK;
case '\0':
return HTTP_PARSE_INVALID_REQUEST;
default:break;
}
break;
case sw_http_09:
switch (ch) {
case ' ':
break;
case CR:
http_minor = 9;
state = sw_almost_done;
break;
case LF:
http_minor = 9;
pos = p + 1;
version = http_major * 1000 + http_minor;
return HTTP_OK;
case 'H':
state = sw_http_H;
break;
default:
state = sw_uri;
break;
}
break;
case sw_http_H:
switch (ch) {
case 'T':
state = sw_http_HT;
break;
default:
return HTTP_PARSE_INVALID_REQUEST;
}
break;
case sw_http_HT:
switch (ch) {
case 'T':
state = sw_http_HTT;
break;
default:
return HTTP_PARSE_INVALID_REQUEST;
}
break;
case sw_http_HTT:
switch (ch) {
case 'P':
state = sw_http_HTTP;
break;
default:
return HTTP_PARSE_INVALID_REQUEST;
}
break;
case sw_http_HTTP:
switch (ch) {
case '/':
state = sw_first_major_digit;
break;
default:
return HTTP_PARSE_INVALID_REQUEST;
}
break;
// first digit of major HTTP version
case sw_first_major_digit:
if (ch < '1' || ch > '9') {
return HTTP_PARSE_INVALID_REQUEST;
}
http_major = ch - '0';
state = sw_major_digit;
break;
// major HTTP version or dot
case sw_major_digit:
if (ch == '.') {
state = sw_first_minor_digit;
break;
}
if (ch < '0' || ch > '9') {
return HTTP_PARSE_INVALID_REQUEST;
}
http_major = http_major * 10 + ch - '0';
break;
// first digit of minor HTTP version
case sw_first_minor_digit:
if (ch < '0' || ch > '9') {
return HTTP_PARSE_INVALID_REQUEST;
}
http_minor = ch - '0';
state = sw_minor_digit;
break;
// minor HTTP version or end of request line
case sw_minor_digit:
if (ch == CR) {
state = sw_almost_done;
break;
}
if (ch == LF) {
pos = p + 1;
version = http_major * 1000 + http_minor;
return HTTP_OK;
}
if (ch == ' ') {
state = sw_spaces_after_digit;
break;
}
if (ch < '0' || ch > '9') {
return HTTP_PARSE_INVALID_REQUEST;
}
http_minor = http_minor * 10 + ch - '0';
break;
case sw_spaces_after_digit:
switch (ch) {
case ' ':
break;
case CR:
state = sw_almost_done;
break;
case LF:
pos = p + 1;
version = http_major * 1000 + http_minor;
return HTTP_OK;
default:
return HTTP_PARSE_INVALID_REQUEST;
}
break;
// end of request line
case sw_almost_done:
switch (ch) {
case LF:
pos = p + 1;
version = http_major * 1000 + http_minor;
return HTTP_OK;
default:
return HTTP_PARSE_INVALID_REQUEST;
}
}
}
pos = p;
return HTTP_PARSE_HEADER_DONE;
}
int Parser::parse_header_line()
{
enum {
sw_start = 0,
sw_name,
sw_space_before_value,
sw_value,
sw_space_after_value,
sw_ignore_line,
sw_almost_done,
sw_header_almost_done
};
char ch, *p=NULL;
uint32_t state = sw_start;
char *header_name_start=NULL,*header_name_end=NULL;
char *header_start=NULL,*header_end=NULL;
for(p = pos; p < packet +length; p++)
{
ch = *p;
switch(state)
{
case sw_start:
{
header_name_start = p;
switch (ch) {
case CR:
header_end = p;
state = sw_header_almost_done;
break;
case LF:
header_end = p;
pos = p + 1;
return HTTP_PARSE_HEADER_DONE;
default:
state = sw_name;
break;
}
}
break;
case sw_name:
{
switch(ch)
{
case ':':
header_name_end = p;
state = sw_space_before_value;
break;
case CR:
header_name_end = p;
header_start = p;
header_end = p;
state = sw_almost_done;
break;
case LF:
header_name_end = p;
header_start = p;
header_end = p;
pos = p + 1;
return 0;
default:
break;
}
}
break;
case sw_space_before_value:
{
switch (ch) {
case ' ':
break;
case CR:
header_start = p;
header_end = p;
state = sw_almost_done;
break;
case LF:
header_start = p;
header_end = p;
pos = p + 1;
return 0;
case '\0':
return HTTP_PARSE_INVALID_HEADER;
default:
header_start = p;
state = sw_value;
break;
}
}
break;
case sw_value:
{
switch (ch) {
case ' ':
header_end = p;
state = sw_space_after_value;
break;
case CR:
header_end = p;
state = sw_almost_done;
break;
case LF:
header_end = p;
pos = p + 1;
return 0;
case '\0':
return HTTP_PARSE_INVALID_HEADER;
}
}
break;
case sw_space_after_value:
{
switch (ch) {
case ' ':
break;
case CR:
state = sw_almost_done;
break;
case LF:
pos = p + 1;
return 0;
case '\0':
return HTTP_PARSE_INVALID_HEADER;
default:
state = sw_value;
break;
}
}
break;
case sw_ignore_line:
{
switch (ch) {
case LF:
state = sw_start;
break;
default:
break;
}
}
break;
case sw_almost_done:
{
switch (ch) {
case LF:
pos = p + 1;
if(header_name_start!=NULL
&&header_name_end>header_name_start
&& header_start!=NULL
&& header_end>header_start)
{
std::string key = std::string(header_name_start,header_name_end-header_name_start);
std::string value = std::string(header_start,header_end-header_start);
KVMap[key]=value;
}
return 0;
case CR:
break;
default:
return HTTP_PARSE_INVALID_HEADER;
}
}
break;
case sw_header_almost_done:
{
switch (ch) {
case LF:
pos = p + 1;
return HTTP_PARSE_HEADER_DONE;
case CR:
break;
default:
return HTTP_PARSE_INVALID_HEADER;
}
}
break;
}
}
pos = p;
return HTTP_PARSE_AGAIN;
}