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comparison src/imap/ngx_imap_parse.c @ 76:da9a3b14312d NGINX_0_1_38

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nginx 0.1.38 *) Feature: the "limit_rate" directive is supported in in proxy and FastCGI mode. *) Feature: the "X-Accel-Limit-Rate" response header line is supported in proxy and FastCGI mode. *) Feature: the "break" directive. *) Feature: the "log_not_found" directive. *) Bugfix: the response status code was not changed when request was redirected by the ""X-Accel-Redirect" header line. *) Bugfix: the variables set by the "set" directive could not be used in SSI. *) Bugfix: the segmentation fault may occurred if the SSI page has more than one remote subrequest. *) Bugfix: nginx treated the backend response as invalid if the status line in the header was transferred in two packets; bug appeared in 0.1.29. *) Feature: the "ssi_types" directive. *) Feature: the "autoindex_exact_size" directive. *) Bugfix: the ngx_http_autoindex_module did not support the long file names in UTF-8. *) Feature: the IMAP/POP3 proxy.
author Igor Sysoev <http://sysoev.ru>
date Fri, 08 Jul 2005 00:00:00 +0400
parents
children 9db7e0b5b27f
comparison
equal deleted inserted replaced
75:985847bb65f9 76:da9a3b14312d
1
2 /*
3 * Copyright (C) Igor Sysoev
4 */
5
6
7 #include <ngx_config.h>
8 #include <ngx_core.h>
9 #include <ngx_event.h>
10 #include <ngx_imap.h>
11
12
13 ngx_int_t ngx_imap_parse_command(ngx_imap_session_t *s)
14 {
15 u_char ch, *p, *c;
16 ngx_str_t *arg;
17 enum {
18 sw_start = 0,
19 sw_spaces_before_command,
20 sw_command,
21 sw_spaces_before_argument,
22 sw_argument,
23 sw_literal,
24 sw_start_literal_argument,
25 sw_literal_argument,
26 sw_end_literal_argument,
27 sw_almost_done
28 } state;
29
30 state = s->state;
31
32 for (p = s->buffer->pos; p < s->buffer->last; p++) {
33 ch = *p;
34
35 switch (state) {
36
37 /* IMAP tag */
38 case sw_start:
39 switch (ch) {
40 case ' ':
41 s->tag.len = p - s->buffer->start + 1;
42 s->tag.data = s->buffer->start;
43 state = sw_spaces_before_command;
44 break;
45 case CR:
46 s->state = sw_start;
47 return NGX_IMAP_PARSE_INVALID_COMMAND;
48 case LF:
49 s->state = sw_start;
50 return NGX_IMAP_PARSE_INVALID_COMMAND;
51 }
52 break;
53
54 case sw_spaces_before_command:
55 switch (ch) {
56 case ' ':
57 break;
58 case CR:
59 s->state = sw_start;
60 return NGX_IMAP_PARSE_INVALID_COMMAND;
61 case LF:
62 s->state = sw_start;
63 return NGX_IMAP_PARSE_INVALID_COMMAND;
64 default:
65 s->cmd_start = p;
66 state = sw_command;
67 break;
68 }
69 break;
70
71 case sw_command:
72 if (ch == ' ' || ch == CR || ch == LF) {
73
74 c = s->cmd_start;
75
76 switch (p - c) {
77
78 case 4:
79 if ((c[0] == 'N' || c[0] == 'n')
80 && (c[1] == 'O'|| c[1] == 'o')
81 && (c[2] == 'O'|| c[2] == 'o')
82 && (c[3] == 'P'|| c[3] == 'p'))
83 {
84 s->command = NGX_IMAP_NOOP;
85
86 } else {
87 goto invalid;
88 }
89 break;
90
91 case 5:
92 if ((c[0] == 'L'|| c[0] == 'l')
93 && (c[1] == 'O'|| c[1] == 'o')
94 && (c[2] == 'G'|| c[2] == 'g')
95 && (c[3] == 'I'|| c[3] == 'i')
96 && (c[4] == 'N'|| c[4] == 'n'))
97 {
98 s->command = NGX_IMAP_LOGIN;
99
100 } else {
101 goto invalid;
102 }
103 break;
104
105 case 6:
106 if ((c[0] == 'L'|| c[0] == 'l')
107 && (c[1] == 'O'|| c[1] == 'o')
108 && (c[2] == 'G'|| c[2] == 'g')
109 && (c[3] == 'O'|| c[3] == 'o')
110 && (c[4] == 'U'|| c[4] == 'u')
111 && (c[5] == 'T'|| c[5] == 't'))
112 {
113 s->command = NGX_IMAP_LOGOUT;
114
115 } else {
116 goto invalid;
117 }
118 break;
119
120 case 10:
121 if ((c[0] == 'C'|| c[0] == 'c')
122 && (c[1] == 'A'|| c[1] == 'a')
123 && (c[2] == 'P'|| c[2] == 'p')
124 && (c[3] == 'A'|| c[3] == 'a')
125 && (c[4] == 'B'|| c[4] == 'b')
126 && (c[5] == 'I'|| c[5] == 'i')
127 && (c[6] == 'L'|| c[6] == 'l')
128 && (c[7] == 'I'|| c[7] == 'i')
129 && (c[8] == 'T'|| c[8] == 't')
130 && (c[9] == 'Y'|| c[9] == 'y'))
131 {
132 s->command = NGX_IMAP_CAPABILITY;
133
134 } else {
135 goto invalid;
136 }
137 break;
138
139 default:
140 goto invalid;
141 }
142
143 switch (ch) {
144 case ' ':
145 state = sw_spaces_before_argument;
146 break;
147 case CR:
148 state = sw_almost_done;
149 break;
150 case LF:
151 goto done;
152 }
153 break;
154 }
155
156 if ((ch < 'A' || ch > 'Z') && (ch < 'a' || ch > 'z')) {
157 goto invalid;
158 }
159
160 break;
161
162 case sw_spaces_before_argument:
163 switch (ch) {
164 case ' ':
165 break;
166 case CR:
167 state = sw_almost_done;
168 s->arg_end = p;
169 break;
170 case LF:
171 s->arg_end = p;
172 goto done;
173 case '"':
174 if (s->args.nelts <= 2) {
175 s->quoted = 1;
176 s->arg_start = p + 1;
177 state = sw_argument;
178 break;
179 }
180 goto invalid;
181 case '{':
182 if (s->args.nelts <= 2) {
183 state = sw_literal;
184 break;
185 }
186 goto invalid;
187 default:
188 if (s->args.nelts <= 2) {
189 s->arg_start = p;
190 state = sw_argument;
191 break;
192 }
193 goto invalid;
194 }
195 break;
196
197 case sw_argument:
198 switch (ch) {
199 case '"':
200 if (!s->quoted) {
201 break;
202 }
203 s->quoted = 0;
204 /* fall through */
205 case ' ':
206 case CR:
207 case LF:
208 arg = ngx_array_push(&s->args);
209 if (arg == NULL) {
210 return NGX_ERROR;
211 }
212 arg->len = p - s->arg_start;
213 arg->data = s->arg_start;
214 s->arg_start = NULL;
215
216 switch (ch) {
217 case '"':
218 case ' ':
219 state = sw_spaces_before_argument;
220 break;
221 case CR:
222 state = sw_almost_done;
223 break;
224 case LF:
225 goto done;
226 }
227 break;
228 }
229 break;
230
231 case sw_literal:
232 if (ch >= '0' && ch <= '9') {
233 s->literal_len = s->literal_len * 10 + (ch - '0');
234 break;
235 }
236 if (ch == '}') {
237 state = sw_start_literal_argument;
238 break;
239 }
240 goto invalid;
241
242 case sw_start_literal_argument:
243 switch (ch) {
244 case CR:
245 break;
246 case LF:
247 s->buffer->pos = p + 1;
248 s->arg_start = p + 1;
249 s->state = sw_literal_argument;
250 return NGX_IMAP_NEXT;
251 }
252 goto invalid;
253
254 case sw_literal_argument:
255 if (--s->literal_len) {
256 break;
257 }
258
259 arg = ngx_array_push(&s->args);
260 if (arg == NULL) {
261 return NGX_ERROR;
262 }
263 arg->len = p + 1 - s->arg_start;
264 arg->data = s->arg_start;
265 s->arg_start = NULL;
266 state = sw_end_literal_argument;
267
268 break;
269
270 case sw_end_literal_argument:
271 switch (ch) {
272 case '{':
273 if (s->args.nelts <= 2) {
274 state = sw_literal;
275 break;
276 }
277 goto invalid;
278 case CR:
279 state = sw_almost_done;
280 break;
281 case LF:
282 goto done;
283 default:
284 goto invalid;
285 }
286 break;
287
288 case sw_almost_done:
289 switch (ch) {
290 case LF:
291 goto done;
292 default:
293 goto invalid;
294 }
295 }
296 }
297
298 s->buffer->pos = p;
299 s->state = state;
300
301 return NGX_AGAIN;
302
303 done:
304
305 s->buffer->pos = p + 1;
306
307 if (s->arg_start) {
308 arg = ngx_array_push(&s->args);
309 if (arg == NULL) {
310 return NGX_ERROR;
311 }
312 arg->len = s->arg_end - s->arg_start;
313 arg->data = s->arg_start;
314 s->arg_start = NULL;
315 s->cmd_start = NULL;
316 s->quoted = 0;
317 s->literal_len = 0;
318 }
319
320 s->state = sw_start;
321
322 return NGX_OK;
323
324 invalid:
325
326 s->state = sw_start;
327 s->quoted = 0;
328 s->literal_len = 0;
329
330 return NGX_IMAP_PARSE_INVALID_COMMAND;
331 }
332
333
334 ngx_int_t ngx_pop3_parse_command(ngx_imap_session_t *s)
335 {
336 u_char ch, *p, *c, c0, c1, c2, c3;
337 ngx_str_t *arg;
338 enum {
339 sw_start = 0,
340 sw_spaces_before_argument,
341 sw_argument,
342 sw_almost_done
343 } state;
344
345 state = s->state;
346
347 for (p = s->buffer->pos; p < s->buffer->last; p++) {
348 ch = *p;
349
350 switch (state) {
351
352 /* POP3 command */
353 case sw_start:
354 if (ch == ' ' || ch == CR || ch == LF) {
355 c = s->buffer->start;
356
357 if (p - c == 4) {
358
359 c0 = ngx_toupper(c[0]);
360 c1 = ngx_toupper(c[1]);
361 c2 = ngx_toupper(c[2]);
362 c3 = ngx_toupper(c[3]);
363
364 if (c0 == 'U' && c1 == 'S' && c2 == 'E' && c3 == 'R')
365 {
366 s->command = NGX_POP3_USER;
367
368 } else if (c0 == 'P' && c1 == 'A' && c2 == 'S' && c3 == 'S')
369 {
370 s->command = NGX_POP3_PASS;
371
372 } else if (c0 == 'Q' && c1 == 'U' && c2 == 'I' && c3 == 'T')
373 {
374 s->command = NGX_POP3_QUIT;
375
376 } else if (c0 == 'C' && c1 == 'A' && c2 == 'P' && c3 == 'A')
377 {
378 s->command = NGX_POP3_CAPA;
379
380 } else if (c0 == 'N' && c1 == 'O' && c2 == 'O' && c3 == 'P')
381 {
382 s->command = NGX_POP3_NOOP;
383
384 } else {
385 goto invalid;
386 }
387
388 } else {
389 goto invalid;
390 }
391
392 switch (ch) {
393 case ' ':
394 state = sw_spaces_before_argument;
395 break;
396 case CR:
397 state = sw_almost_done;
398 break;
399 case LF:
400 goto done;
401 }
402 break;
403 }
404
405 if ((ch < 'A' || ch > 'Z') && (ch < 'a' || ch > 'z')) {
406 goto invalid;
407 }
408
409 break;
410
411 case sw_spaces_before_argument:
412 switch (ch) {
413 case ' ':
414 break;
415 case CR:
416 state = sw_almost_done;
417 s->arg_end = p;
418 break;
419 case LF:
420 s->arg_end = p;
421 goto done;
422 default:
423 if (s->args.nelts <= 2) {
424 state = sw_argument;
425 s->arg_start = p;
426 break;
427 }
428 goto invalid;
429 }
430 break;
431
432 case sw_argument:
433 switch (ch) {
434 case ' ':
435 case CR:
436 case LF:
437 arg = ngx_array_push(&s->args);
438 if (arg == NULL) {
439 return NGX_ERROR;
440 }
441 arg->len = p - s->arg_start;
442 arg->data = s->arg_start;
443 s->arg_start = NULL;
444
445 switch (ch) {
446 case ' ':
447 state = sw_spaces_before_argument;
448 break;
449 case CR:
450 state = sw_almost_done;
451 break;
452 case LF:
453 goto done;
454 }
455 break;
456
457 default:
458 break;
459 }
460 break;
461
462 case sw_almost_done:
463 switch (ch) {
464 case LF:
465 goto done;
466 default:
467 goto invalid;
468 }
469 }
470 }
471
472 s->buffer->pos = p;
473 s->state = state;
474
475 return NGX_AGAIN;
476
477 done:
478
479 s->buffer->pos = p + 1;
480
481 if (s->arg_start) {
482 arg = ngx_array_push(&s->args);
483 if (arg == NULL) {
484 return NGX_ERROR;
485 }
486 arg->len = s->arg_end - s->arg_start;
487 arg->data = s->arg_start;
488 s->arg_start = NULL;
489 }
490
491 s->state = sw_start;
492
493 return NGX_OK;
494
495 invalid:
496
497 s->state = sw_start;
498
499 return NGX_IMAP_PARSE_INVALID_COMMAND;
500 }