Mercurial > hg > nginx-quic
annotate src/http/modules/ngx_http_slice_filter_module.c @ 7668:a4ed2305ad2c quic
ChaCha20 / Poly1305 initial support.
author | Sergey Kandaurov <pluknet@nginx.com> |
---|---|
date | Tue, 10 Mar 2020 19:13:09 +0300 |
parents | f583559aadc7 |
children | 32a343635b50 |
rev | line source |
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6317 | 1 |
2 /* | |
3 * Copyright (C) Roman Arutyunyan | |
4 * Copyright (C) Nginx, Inc. | |
5 */ | |
6 | |
7 | |
8 #include <ngx_config.h> | |
9 #include <ngx_core.h> | |
10 #include <ngx_http.h> | |
11 | |
12 | |
13 typedef struct { | |
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14 size_t size; |
6317 | 15 } ngx_http_slice_loc_conf_t; |
16 | |
17 | |
18 typedef struct { | |
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19 off_t start; |
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20 off_t end; |
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21 ngx_str_t range; |
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22 ngx_str_t etag; |
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23 unsigned last:1; |
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24 unsigned active:1; |
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25 ngx_http_request_t *sr; |
6317 | 26 } ngx_http_slice_ctx_t; |
27 | |
28 | |
29 typedef struct { | |
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30 off_t start; |
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31 off_t end; |
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32 off_t complete_length; |
6317 | 33 } ngx_http_slice_content_range_t; |
34 | |
35 | |
36 static ngx_int_t ngx_http_slice_header_filter(ngx_http_request_t *r); | |
37 static ngx_int_t ngx_http_slice_body_filter(ngx_http_request_t *r, | |
38 ngx_chain_t *in); | |
39 static ngx_int_t ngx_http_slice_parse_content_range(ngx_http_request_t *r, | |
40 ngx_http_slice_content_range_t *cr); | |
41 static ngx_int_t ngx_http_slice_range_variable(ngx_http_request_t *r, | |
42 ngx_http_variable_value_t *v, uintptr_t data); | |
43 static off_t ngx_http_slice_get_start(ngx_http_request_t *r); | |
44 static void *ngx_http_slice_create_loc_conf(ngx_conf_t *cf); | |
45 static char *ngx_http_slice_merge_loc_conf(ngx_conf_t *cf, void *parent, | |
46 void *child); | |
47 static ngx_int_t ngx_http_slice_add_variables(ngx_conf_t *cf); | |
48 static ngx_int_t ngx_http_slice_init(ngx_conf_t *cf); | |
49 | |
50 | |
51 static ngx_command_t ngx_http_slice_filter_commands[] = { | |
52 | |
53 { ngx_string("slice"), | |
54 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, | |
55 ngx_conf_set_size_slot, | |
56 NGX_HTTP_LOC_CONF_OFFSET, | |
57 offsetof(ngx_http_slice_loc_conf_t, size), | |
58 NULL }, | |
59 | |
60 ngx_null_command | |
61 }; | |
62 | |
63 | |
64 static ngx_http_module_t ngx_http_slice_filter_module_ctx = { | |
65 ngx_http_slice_add_variables, /* preconfiguration */ | |
66 ngx_http_slice_init, /* postconfiguration */ | |
67 | |
68 NULL, /* create main configuration */ | |
69 NULL, /* init main configuration */ | |
70 | |
71 NULL, /* create server configuration */ | |
72 NULL, /* merge server configuration */ | |
73 | |
74 ngx_http_slice_create_loc_conf, /* create location configuration */ | |
75 ngx_http_slice_merge_loc_conf /* merge location configuration */ | |
76 }; | |
77 | |
78 | |
79 ngx_module_t ngx_http_slice_filter_module = { | |
80 NGX_MODULE_V1, | |
81 &ngx_http_slice_filter_module_ctx, /* module context */ | |
82 ngx_http_slice_filter_commands, /* module directives */ | |
83 NGX_HTTP_MODULE, /* module type */ | |
84 NULL, /* init master */ | |
85 NULL, /* init module */ | |
86 NULL, /* init process */ | |
87 NULL, /* init thread */ | |
88 NULL, /* exit thread */ | |
89 NULL, /* exit process */ | |
90 NULL, /* exit master */ | |
91 NGX_MODULE_V1_PADDING | |
92 }; | |
93 | |
94 | |
95 static ngx_str_t ngx_http_slice_range_name = ngx_string("slice_range"); | |
96 | |
97 static ngx_http_output_header_filter_pt ngx_http_next_header_filter; | |
98 static ngx_http_output_body_filter_pt ngx_http_next_body_filter; | |
99 | |
100 | |
101 static ngx_int_t | |
102 ngx_http_slice_header_filter(ngx_http_request_t *r) | |
103 { | |
104 off_t end; | |
105 ngx_int_t rc; | |
106 ngx_table_elt_t *h; | |
107 ngx_http_slice_ctx_t *ctx; | |
108 ngx_http_slice_loc_conf_t *slcf; | |
109 ngx_http_slice_content_range_t cr; | |
110 | |
111 ctx = ngx_http_get_module_ctx(r, ngx_http_slice_filter_module); | |
112 if (ctx == NULL) { | |
113 return ngx_http_next_header_filter(r); | |
114 } | |
115 | |
116 if (r->headers_out.status != NGX_HTTP_PARTIAL_CONTENT) { | |
117 if (r == r->main) { | |
118 ngx_http_set_ctx(r, NULL, ngx_http_slice_filter_module); | |
119 return ngx_http_next_header_filter(r); | |
120 } | |
121 | |
122 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, | |
123 "unexpected status code %ui in slice response", | |
124 r->headers_out.status); | |
125 return NGX_ERROR; | |
126 } | |
127 | |
128 h = r->headers_out.etag; | |
129 | |
130 if (ctx->etag.len) { | |
131 if (h == NULL | |
132 || h->value.len != ctx->etag.len | |
133 || ngx_strncmp(h->value.data, ctx->etag.data, ctx->etag.len) | |
134 != 0) | |
135 { | |
136 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, | |
137 "etag mismatch in slice response"); | |
138 return NGX_ERROR; | |
139 } | |
140 } | |
141 | |
142 if (h) { | |
143 ctx->etag = h->value; | |
144 } | |
145 | |
146 if (ngx_http_slice_parse_content_range(r, &cr) != NGX_OK) { | |
147 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, | |
148 "invalid range in slice response"); | |
149 return NGX_ERROR; | |
150 } | |
151 | |
152 if (cr.complete_length == -1) { | |
153 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, | |
154 "no complete length in slice response"); | |
155 return NGX_ERROR; | |
156 } | |
157 | |
158 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
159 "http slice response range: %O-%O/%O", | |
160 cr.start, cr.end, cr.complete_length); | |
161 | |
162 slcf = ngx_http_get_module_loc_conf(r, ngx_http_slice_filter_module); | |
163 | |
164 end = ngx_min(cr.start + (off_t) slcf->size, cr.complete_length); | |
165 | |
166 if (cr.start != ctx->start || cr.end != end) { | |
167 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, | |
168 "unexpected range in slice response: %O-%O", | |
169 cr.start, cr.end); | |
170 return NGX_ERROR; | |
171 } | |
172 | |
173 ctx->start = end; | |
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174 ctx->active = 1; |
6317 | 175 |
176 r->headers_out.status = NGX_HTTP_OK; | |
177 r->headers_out.status_line.len = 0; | |
178 r->headers_out.content_length_n = cr.complete_length; | |
179 r->headers_out.content_offset = cr.start; | |
180 r->headers_out.content_range->hash = 0; | |
181 r->headers_out.content_range = NULL; | |
182 | |
183 r->allow_ranges = 1; | |
184 r->subrequest_ranges = 1; | |
185 r->single_range = 1; | |
186 | |
187 rc = ngx_http_next_header_filter(r); | |
188 | |
189 if (r != r->main) { | |
190 return rc; | |
191 } | |
192 | |
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193 r->preserve_body = 1; |
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194 |
6317 | 195 if (r->headers_out.status == NGX_HTTP_PARTIAL_CONTENT) { |
196 if (ctx->start + (off_t) slcf->size <= r->headers_out.content_offset) { | |
197 ctx->start = slcf->size | |
198 * (r->headers_out.content_offset / slcf->size); | |
199 } | |
200 | |
201 ctx->end = r->headers_out.content_offset | |
202 + r->headers_out.content_length_n; | |
203 | |
204 } else { | |
205 ctx->end = cr.complete_length; | |
206 } | |
207 | |
208 return rc; | |
209 } | |
210 | |
211 | |
212 static ngx_int_t | |
213 ngx_http_slice_body_filter(ngx_http_request_t *r, ngx_chain_t *in) | |
214 { | |
215 ngx_int_t rc; | |
216 ngx_chain_t *cl; | |
217 ngx_http_slice_ctx_t *ctx; | |
218 ngx_http_slice_loc_conf_t *slcf; | |
219 | |
220 ctx = ngx_http_get_module_ctx(r, ngx_http_slice_filter_module); | |
221 | |
222 if (ctx == NULL || r != r->main) { | |
223 return ngx_http_next_body_filter(r, in); | |
224 } | |
225 | |
226 for (cl = in; cl; cl = cl->next) { | |
227 if (cl->buf->last_buf) { | |
228 cl->buf->last_buf = 0; | |
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229 cl->buf->last_in_chain = 1; |
6317 | 230 cl->buf->sync = 1; |
231 ctx->last = 1; | |
232 } | |
233 } | |
234 | |
235 rc = ngx_http_next_body_filter(r, in); | |
236 | |
237 if (rc == NGX_ERROR || !ctx->last) { | |
238 return rc; | |
239 } | |
240 | |
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241 if (ctx->sr && !ctx->sr->done) { |
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242 return rc; |
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243 } |
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244 |
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245 if (!ctx->active) { |
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246 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, |
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247 "missing slice response"); |
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248 return NGX_ERROR; |
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249 } |
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250 |
6317 | 251 if (ctx->start >= ctx->end) { |
252 ngx_http_set_ctx(r, NULL, ngx_http_slice_filter_module); | |
253 ngx_http_send_special(r, NGX_HTTP_LAST); | |
254 return rc; | |
255 } | |
256 | |
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257 if (r->buffered) { |
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258 return rc; |
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259 } |
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260 |
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261 if (ngx_http_subrequest(r, &r->uri, &r->args, &ctx->sr, NULL, |
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262 NGX_HTTP_SUBREQUEST_CLONE) |
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263 != NGX_OK) |
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264 { |
6317 | 265 return NGX_ERROR; |
266 } | |
267 | |
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268 ngx_http_set_ctx(ctx->sr, ctx, ngx_http_slice_filter_module); |
6317 | 269 |
270 slcf = ngx_http_get_module_loc_conf(r, ngx_http_slice_filter_module); | |
271 | |
272 ctx->range.len = ngx_sprintf(ctx->range.data, "bytes=%O-%O", ctx->start, | |
273 ctx->start + (off_t) slcf->size - 1) | |
274 - ctx->range.data; | |
275 | |
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276 ctx->active = 0; |
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277 |
6317 | 278 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, |
279 "http slice subrequest: \"%V\"", &ctx->range); | |
280 | |
281 return rc; | |
282 } | |
283 | |
284 | |
285 static ngx_int_t | |
286 ngx_http_slice_parse_content_range(ngx_http_request_t *r, | |
287 ngx_http_slice_content_range_t *cr) | |
288 { | |
289 off_t start, end, complete_length, cutoff, cutlim; | |
290 u_char *p; | |
291 ngx_table_elt_t *h; | |
292 | |
293 h = r->headers_out.content_range; | |
294 | |
295 if (h == NULL | |
296 || h->value.len < 7 | |
297 || ngx_strncmp(h->value.data, "bytes ", 6) != 0) | |
298 { | |
299 return NGX_ERROR; | |
300 } | |
301 | |
302 p = h->value.data + 6; | |
303 | |
304 cutoff = NGX_MAX_OFF_T_VALUE / 10; | |
305 cutlim = NGX_MAX_OFF_T_VALUE % 10; | |
306 | |
307 start = 0; | |
308 end = 0; | |
309 complete_length = 0; | |
310 | |
311 while (*p == ' ') { p++; } | |
312 | |
313 if (*p < '0' || *p > '9') { | |
314 return NGX_ERROR; | |
315 } | |
316 | |
317 while (*p >= '0' && *p <= '9') { | |
318 if (start >= cutoff && (start > cutoff || *p - '0' > cutlim)) { | |
319 return NGX_ERROR; | |
320 } | |
321 | |
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322 start = start * 10 + (*p++ - '0'); |
6317 | 323 } |
324 | |
325 while (*p == ' ') { p++; } | |
326 | |
327 if (*p++ != '-') { | |
328 return NGX_ERROR; | |
329 } | |
330 | |
331 while (*p == ' ') { p++; } | |
332 | |
333 if (*p < '0' || *p > '9') { | |
334 return NGX_ERROR; | |
335 } | |
336 | |
337 while (*p >= '0' && *p <= '9') { | |
338 if (end >= cutoff && (end > cutoff || *p - '0' > cutlim)) { | |
339 return NGX_ERROR; | |
340 } | |
341 | |
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342 end = end * 10 + (*p++ - '0'); |
6317 | 343 } |
344 | |
345 end++; | |
346 | |
347 while (*p == ' ') { p++; } | |
348 | |
349 if (*p++ != '/') { | |
350 return NGX_ERROR; | |
351 } | |
352 | |
353 while (*p == ' ') { p++; } | |
354 | |
355 if (*p != '*') { | |
356 if (*p < '0' || *p > '9') { | |
357 return NGX_ERROR; | |
358 } | |
359 | |
360 while (*p >= '0' && *p <= '9') { | |
361 if (complete_length >= cutoff | |
362 && (complete_length > cutoff || *p - '0' > cutlim)) | |
363 { | |
364 return NGX_ERROR; | |
365 } | |
366 | |
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367 complete_length = complete_length * 10 + (*p++ - '0'); |
6317 | 368 } |
369 | |
370 } else { | |
371 complete_length = -1; | |
372 p++; | |
373 } | |
374 | |
375 while (*p == ' ') { p++; } | |
376 | |
377 if (*p != '\0') { | |
378 return NGX_ERROR; | |
379 } | |
380 | |
381 cr->start = start; | |
382 cr->end = end; | |
383 cr->complete_length = complete_length; | |
384 | |
385 return NGX_OK; | |
386 } | |
387 | |
388 | |
389 static ngx_int_t | |
390 ngx_http_slice_range_variable(ngx_http_request_t *r, | |
391 ngx_http_variable_value_t *v, uintptr_t data) | |
392 { | |
393 u_char *p; | |
394 ngx_http_slice_ctx_t *ctx; | |
395 ngx_http_slice_loc_conf_t *slcf; | |
396 | |
397 ctx = ngx_http_get_module_ctx(r, ngx_http_slice_filter_module); | |
398 | |
399 if (ctx == NULL) { | |
400 if (r != r->main || r->headers_out.status) { | |
401 v->not_found = 1; | |
402 return NGX_OK; | |
403 } | |
404 | |
405 slcf = ngx_http_get_module_loc_conf(r, ngx_http_slice_filter_module); | |
406 | |
407 if (slcf->size == 0) { | |
408 v->not_found = 1; | |
409 return NGX_OK; | |
410 } | |
411 | |
412 ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_slice_ctx_t)); | |
413 if (ctx == NULL) { | |
414 return NGX_ERROR; | |
415 } | |
416 | |
417 ngx_http_set_ctx(r, ctx, ngx_http_slice_filter_module); | |
418 | |
419 p = ngx_pnalloc(r->pool, sizeof("bytes=-") - 1 + 2 * NGX_OFF_T_LEN); | |
420 if (p == NULL) { | |
421 return NGX_ERROR; | |
422 } | |
423 | |
424 ctx->start = slcf->size * (ngx_http_slice_get_start(r) / slcf->size); | |
425 | |
426 ctx->range.data = p; | |
427 ctx->range.len = ngx_sprintf(p, "bytes=%O-%O", ctx->start, | |
428 ctx->start + (off_t) slcf->size - 1) | |
429 - p; | |
430 } | |
431 | |
432 v->data = ctx->range.data; | |
433 v->valid = 1; | |
434 v->not_found = 0; | |
435 v->no_cacheable = 1; | |
436 v->len = ctx->range.len; | |
437 | |
438 return NGX_OK; | |
439 } | |
440 | |
441 | |
442 static off_t | |
443 ngx_http_slice_get_start(ngx_http_request_t *r) | |
444 { | |
445 off_t start, cutoff, cutlim; | |
446 u_char *p; | |
447 ngx_table_elt_t *h; | |
448 | |
449 if (r->headers_in.if_range) { | |
450 return 0; | |
451 } | |
452 | |
453 h = r->headers_in.range; | |
454 | |
455 if (h == NULL | |
456 || h->value.len < 7 | |
457 || ngx_strncasecmp(h->value.data, (u_char *) "bytes=", 6) != 0) | |
458 { | |
459 return 0; | |
460 } | |
461 | |
462 p = h->value.data + 6; | |
463 | |
464 if (ngx_strchr(p, ',')) { | |
465 return 0; | |
466 } | |
467 | |
468 while (*p == ' ') { p++; } | |
469 | |
470 if (*p == '-') { | |
471 return 0; | |
472 } | |
473 | |
474 cutoff = NGX_MAX_OFF_T_VALUE / 10; | |
475 cutlim = NGX_MAX_OFF_T_VALUE % 10; | |
476 | |
477 start = 0; | |
478 | |
479 while (*p >= '0' && *p <= '9') { | |
480 if (start >= cutoff && (start > cutoff || *p - '0' > cutlim)) { | |
481 return 0; | |
482 } | |
483 | |
7067
e3723f2a11b7
Parenthesized ASCII-related calculations.
Valentin Bartenev <vbart@nginx.com>
parents:
6963
diff
changeset
|
484 start = start * 10 + (*p++ - '0'); |
6317 | 485 } |
486 | |
487 return start; | |
488 } | |
489 | |
490 | |
491 static void * | |
492 ngx_http_slice_create_loc_conf(ngx_conf_t *cf) | |
493 { | |
494 ngx_http_slice_loc_conf_t *slcf; | |
495 | |
496 slcf = ngx_palloc(cf->pool, sizeof(ngx_http_slice_loc_conf_t)); | |
497 if (slcf == NULL) { | |
498 return NULL; | |
499 } | |
500 | |
501 slcf->size = NGX_CONF_UNSET_SIZE; | |
502 | |
503 return slcf; | |
504 } | |
505 | |
506 | |
507 static char * | |
508 ngx_http_slice_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child) | |
509 { | |
510 ngx_http_slice_loc_conf_t *prev = parent; | |
511 ngx_http_slice_loc_conf_t *conf = child; | |
512 | |
513 ngx_conf_merge_size_value(conf->size, prev->size, 0); | |
514 | |
515 return NGX_CONF_OK; | |
516 } | |
517 | |
518 | |
519 static ngx_int_t | |
520 ngx_http_slice_add_variables(ngx_conf_t *cf) | |
521 { | |
522 ngx_http_variable_t *var; | |
523 | |
524 var = ngx_http_add_variable(cf, &ngx_http_slice_range_name, 0); | |
525 if (var == NULL) { | |
526 return NGX_ERROR; | |
527 } | |
528 | |
529 var->get_handler = ngx_http_slice_range_variable; | |
530 | |
531 return NGX_OK; | |
532 } | |
533 | |
534 | |
535 static ngx_int_t | |
536 ngx_http_slice_init(ngx_conf_t *cf) | |
537 { | |
538 ngx_http_next_header_filter = ngx_http_top_header_filter; | |
539 ngx_http_top_header_filter = ngx_http_slice_header_filter; | |
540 | |
541 ngx_http_next_body_filter = ngx_http_top_body_filter; | |
542 ngx_http_top_body_filter = ngx_http_slice_body_filter; | |
543 | |
544 return NGX_OK; | |
545 } |