76
|
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:
|
78
|
255 if (s->literal_len && --s->literal_len) {
|
76
|
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:
|
78
|
284 state = sw_spaces_before_argument;
|
|
285 break;
|
76
|
286 }
|
|
287 break;
|
|
288
|
|
289 case sw_almost_done:
|
|
290 switch (ch) {
|
|
291 case LF:
|
|
292 goto done;
|
|
293 default:
|
|
294 goto invalid;
|
|
295 }
|
|
296 }
|
|
297 }
|
|
298
|
|
299 s->buffer->pos = p;
|
|
300 s->state = state;
|
|
301
|
|
302 return NGX_AGAIN;
|
|
303
|
|
304 done:
|
|
305
|
|
306 s->buffer->pos = p + 1;
|
|
307
|
|
308 if (s->arg_start) {
|
|
309 arg = ngx_array_push(&s->args);
|
|
310 if (arg == NULL) {
|
|
311 return NGX_ERROR;
|
|
312 }
|
|
313 arg->len = s->arg_end - s->arg_start;
|
|
314 arg->data = s->arg_start;
|
|
315 s->arg_start = NULL;
|
|
316 s->cmd_start = NULL;
|
|
317 s->quoted = 0;
|
|
318 s->literal_len = 0;
|
|
319 }
|
|
320
|
|
321 s->state = sw_start;
|
|
322
|
|
323 return NGX_OK;
|
|
324
|
|
325 invalid:
|
|
326
|
|
327 s->state = sw_start;
|
|
328 s->quoted = 0;
|
|
329 s->literal_len = 0;
|
|
330
|
|
331 return NGX_IMAP_PARSE_INVALID_COMMAND;
|
|
332 }
|
|
333
|
|
334
|
|
335 ngx_int_t ngx_pop3_parse_command(ngx_imap_session_t *s)
|
|
336 {
|
|
337 u_char ch, *p, *c, c0, c1, c2, c3;
|
|
338 ngx_str_t *arg;
|
|
339 enum {
|
|
340 sw_start = 0,
|
|
341 sw_spaces_before_argument,
|
|
342 sw_argument,
|
|
343 sw_almost_done
|
|
344 } state;
|
|
345
|
|
346 state = s->state;
|
|
347
|
|
348 for (p = s->buffer->pos; p < s->buffer->last; p++) {
|
|
349 ch = *p;
|
|
350
|
|
351 switch (state) {
|
|
352
|
|
353 /* POP3 command */
|
|
354 case sw_start:
|
|
355 if (ch == ' ' || ch == CR || ch == LF) {
|
|
356 c = s->buffer->start;
|
|
357
|
|
358 if (p - c == 4) {
|
|
359
|
|
360 c0 = ngx_toupper(c[0]);
|
|
361 c1 = ngx_toupper(c[1]);
|
|
362 c2 = ngx_toupper(c[2]);
|
|
363 c3 = ngx_toupper(c[3]);
|
|
364
|
|
365 if (c0 == 'U' && c1 == 'S' && c2 == 'E' && c3 == 'R')
|
|
366 {
|
|
367 s->command = NGX_POP3_USER;
|
|
368
|
|
369 } else if (c0 == 'P' && c1 == 'A' && c2 == 'S' && c3 == 'S')
|
|
370 {
|
|
371 s->command = NGX_POP3_PASS;
|
|
372
|
|
373 } else if (c0 == 'Q' && c1 == 'U' && c2 == 'I' && c3 == 'T')
|
|
374 {
|
|
375 s->command = NGX_POP3_QUIT;
|
|
376
|
|
377 } else if (c0 == 'C' && c1 == 'A' && c2 == 'P' && c3 == 'A')
|
|
378 {
|
|
379 s->command = NGX_POP3_CAPA;
|
|
380
|
|
381 } else if (c0 == 'N' && c1 == 'O' && c2 == 'O' && c3 == 'P')
|
|
382 {
|
|
383 s->command = NGX_POP3_NOOP;
|
|
384
|
|
385 } else {
|
|
386 goto invalid;
|
|
387 }
|
|
388
|
|
389 } else {
|
|
390 goto invalid;
|
|
391 }
|
|
392
|
|
393 switch (ch) {
|
|
394 case ' ':
|
|
395 state = sw_spaces_before_argument;
|
|
396 break;
|
|
397 case CR:
|
|
398 state = sw_almost_done;
|
|
399 break;
|
|
400 case LF:
|
|
401 goto done;
|
|
402 }
|
|
403 break;
|
|
404 }
|
|
405
|
|
406 if ((ch < 'A' || ch > 'Z') && (ch < 'a' || ch > 'z')) {
|
|
407 goto invalid;
|
|
408 }
|
|
409
|
|
410 break;
|
|
411
|
|
412 case sw_spaces_before_argument:
|
|
413 switch (ch) {
|
|
414 case ' ':
|
|
415 break;
|
|
416 case CR:
|
|
417 state = sw_almost_done;
|
|
418 s->arg_end = p;
|
|
419 break;
|
|
420 case LF:
|
|
421 s->arg_end = p;
|
|
422 goto done;
|
|
423 default:
|
|
424 if (s->args.nelts <= 2) {
|
|
425 state = sw_argument;
|
|
426 s->arg_start = p;
|
|
427 break;
|
|
428 }
|
|
429 goto invalid;
|
|
430 }
|
|
431 break;
|
|
432
|
|
433 case sw_argument:
|
|
434 switch (ch) {
|
|
435 case ' ':
|
|
436 case CR:
|
|
437 case LF:
|
|
438 arg = ngx_array_push(&s->args);
|
|
439 if (arg == NULL) {
|
|
440 return NGX_ERROR;
|
|
441 }
|
|
442 arg->len = p - s->arg_start;
|
|
443 arg->data = s->arg_start;
|
|
444 s->arg_start = NULL;
|
|
445
|
|
446 switch (ch) {
|
|
447 case ' ':
|
|
448 state = sw_spaces_before_argument;
|
|
449 break;
|
|
450 case CR:
|
|
451 state = sw_almost_done;
|
|
452 break;
|
|
453 case LF:
|
|
454 goto done;
|
|
455 }
|
|
456 break;
|
|
457
|
|
458 default:
|
|
459 break;
|
|
460 }
|
|
461 break;
|
|
462
|
|
463 case sw_almost_done:
|
|
464 switch (ch) {
|
|
465 case LF:
|
|
466 goto done;
|
|
467 default:
|
|
468 goto invalid;
|
|
469 }
|
|
470 }
|
|
471 }
|
|
472
|
|
473 s->buffer->pos = p;
|
|
474 s->state = state;
|
|
475
|
|
476 return NGX_AGAIN;
|
|
477
|
|
478 done:
|
|
479
|
|
480 s->buffer->pos = p + 1;
|
|
481
|
|
482 if (s->arg_start) {
|
|
483 arg = ngx_array_push(&s->args);
|
|
484 if (arg == NULL) {
|
|
485 return NGX_ERROR;
|
|
486 }
|
|
487 arg->len = s->arg_end - s->arg_start;
|
|
488 arg->data = s->arg_start;
|
|
489 s->arg_start = NULL;
|
|
490 }
|
|
491
|
|
492 s->state = sw_start;
|
|
493
|
|
494 return NGX_OK;
|
|
495
|
|
496 invalid:
|
|
497
|
|
498 s->state = sw_start;
|
|
499
|
|
500 return NGX_IMAP_PARSE_INVALID_COMMAND;
|
|
501 }
|