Mercurial > hg > nginx-quic
annotate src/http/modules/ngx_http_slice_filter_module.c @ 6984:201038680680
Sub filter: restored ngx_http_set_ctx() at the proper place.
Previously, ngx_http_sub_header_filter() could fail with a partially
initialized context, later accessed in ngx_http_sub_body_filter()
if called from the perl content handler.
The issue had appeared in 2c045e5b8291 (1.9.4).
A better fix would be to handle ngx_http_send_header() errors in
the perl module, though this doesn't seem to be easy enough.
author | Sergey Kandaurov <pluknet@nginx.com> |
---|---|
date | Tue, 18 Apr 2017 19:55:23 +0300 |
parents | 3ff293cfdab8 |
children | e3723f2a11b7 |
rev | line source |
---|---|
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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parents:
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diff
changeset
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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 | |
193 if (r->headers_out.status == NGX_HTTP_PARTIAL_CONTENT) { | |
194 if (ctx->start + (off_t) slcf->size <= r->headers_out.content_offset) { | |
195 ctx->start = slcf->size | |
196 * (r->headers_out.content_offset / slcf->size); | |
197 } | |
198 | |
199 ctx->end = r->headers_out.content_offset | |
200 + r->headers_out.content_length_n; | |
201 | |
202 } else { | |
203 ctx->end = cr.complete_length; | |
204 } | |
205 | |
206 return rc; | |
207 } | |
208 | |
209 | |
210 static ngx_int_t | |
211 ngx_http_slice_body_filter(ngx_http_request_t *r, ngx_chain_t *in) | |
212 { | |
213 ngx_int_t rc; | |
214 ngx_chain_t *cl; | |
215 ngx_http_slice_ctx_t *ctx; | |
216 ngx_http_slice_loc_conf_t *slcf; | |
217 | |
218 ctx = ngx_http_get_module_ctx(r, ngx_http_slice_filter_module); | |
219 | |
220 if (ctx == NULL || r != r->main) { | |
221 return ngx_http_next_body_filter(r, in); | |
222 } | |
223 | |
224 for (cl = in; cl; cl = cl->next) { | |
225 if (cl->buf->last_buf) { | |
226 cl->buf->last_buf = 0; | |
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Slice filter: terminate first slice with last_in_chain flag.
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227 cl->buf->last_in_chain = 1; |
6317 | 228 cl->buf->sync = 1; |
229 ctx->last = 1; | |
230 } | |
231 } | |
232 | |
233 rc = ngx_http_next_body_filter(r, in); | |
234 | |
235 if (rc == NGX_ERROR || !ctx->last) { | |
236 return rc; | |
237 } | |
238 | |
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239 if (ctx->sr && !ctx->sr->done) { |
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240 return rc; |
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241 } |
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242 |
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parents:
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243 if (!ctx->active) { |
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parents:
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244 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, |
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245 "missing slice response"); |
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246 return NGX_ERROR; |
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parents:
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247 } |
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parents:
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248 |
6317 | 249 if (ctx->start >= ctx->end) { |
250 ngx_http_set_ctx(r, NULL, ngx_http_slice_filter_module); | |
251 ngx_http_send_special(r, NGX_HTTP_LAST); | |
252 return rc; | |
253 } | |
254 | |
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255 if (r->buffered) { |
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256 return rc; |
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Slice filter: never run subrequests when main request is buffered.
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257 } |
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258 |
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259 if (ngx_http_subrequest(r, &r->uri, &r->args, &ctx->sr, NULL, |
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260 NGX_HTTP_SUBREQUEST_CLONE) |
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261 != NGX_OK) |
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262 { |
6317 | 263 return NGX_ERROR; |
264 } | |
265 | |
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266 ngx_http_set_ctx(ctx->sr, ctx, ngx_http_slice_filter_module); |
6317 | 267 |
268 slcf = ngx_http_get_module_loc_conf(r, ngx_http_slice_filter_module); | |
269 | |
270 ctx->range.len = ngx_sprintf(ctx->range.data, "bytes=%O-%O", ctx->start, | |
271 ctx->start + (off_t) slcf->size - 1) | |
272 - ctx->range.data; | |
273 | |
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parents:
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274 ctx->active = 0; |
3ff293cfdab8
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parents:
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275 |
6317 | 276 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, |
277 "http slice subrequest: \"%V\"", &ctx->range); | |
278 | |
279 return rc; | |
280 } | |
281 | |
282 | |
283 static ngx_int_t | |
284 ngx_http_slice_parse_content_range(ngx_http_request_t *r, | |
285 ngx_http_slice_content_range_t *cr) | |
286 { | |
287 off_t start, end, complete_length, cutoff, cutlim; | |
288 u_char *p; | |
289 ngx_table_elt_t *h; | |
290 | |
291 h = r->headers_out.content_range; | |
292 | |
293 if (h == NULL | |
294 || h->value.len < 7 | |
295 || ngx_strncmp(h->value.data, "bytes ", 6) != 0) | |
296 { | |
297 return NGX_ERROR; | |
298 } | |
299 | |
300 p = h->value.data + 6; | |
301 | |
302 cutoff = NGX_MAX_OFF_T_VALUE / 10; | |
303 cutlim = NGX_MAX_OFF_T_VALUE % 10; | |
304 | |
305 start = 0; | |
306 end = 0; | |
307 complete_length = 0; | |
308 | |
309 while (*p == ' ') { p++; } | |
310 | |
311 if (*p < '0' || *p > '9') { | |
312 return NGX_ERROR; | |
313 } | |
314 | |
315 while (*p >= '0' && *p <= '9') { | |
316 if (start >= cutoff && (start > cutoff || *p - '0' > cutlim)) { | |
317 return NGX_ERROR; | |
318 } | |
319 | |
320 start = start * 10 + *p++ - '0'; | |
321 } | |
322 | |
323 while (*p == ' ') { p++; } | |
324 | |
325 if (*p++ != '-') { | |
326 return NGX_ERROR; | |
327 } | |
328 | |
329 while (*p == ' ') { p++; } | |
330 | |
331 if (*p < '0' || *p > '9') { | |
332 return NGX_ERROR; | |
333 } | |
334 | |
335 while (*p >= '0' && *p <= '9') { | |
336 if (end >= cutoff && (end > cutoff || *p - '0' > cutlim)) { | |
337 return NGX_ERROR; | |
338 } | |
339 | |
340 end = end * 10 + *p++ - '0'; | |
341 } | |
342 | |
343 end++; | |
344 | |
345 while (*p == ' ') { p++; } | |
346 | |
347 if (*p++ != '/') { | |
348 return NGX_ERROR; | |
349 } | |
350 | |
351 while (*p == ' ') { p++; } | |
352 | |
353 if (*p != '*') { | |
354 if (*p < '0' || *p > '9') { | |
355 return NGX_ERROR; | |
356 } | |
357 | |
358 while (*p >= '0' && *p <= '9') { | |
359 if (complete_length >= cutoff | |
360 && (complete_length > cutoff || *p - '0' > cutlim)) | |
361 { | |
362 return NGX_ERROR; | |
363 } | |
364 | |
365 complete_length = complete_length * 10 + *p++ - '0'; | |
366 } | |
367 | |
368 } else { | |
369 complete_length = -1; | |
370 p++; | |
371 } | |
372 | |
373 while (*p == ' ') { p++; } | |
374 | |
375 if (*p != '\0') { | |
376 return NGX_ERROR; | |
377 } | |
378 | |
379 cr->start = start; | |
380 cr->end = end; | |
381 cr->complete_length = complete_length; | |
382 | |
383 return NGX_OK; | |
384 } | |
385 | |
386 | |
387 static ngx_int_t | |
388 ngx_http_slice_range_variable(ngx_http_request_t *r, | |
389 ngx_http_variable_value_t *v, uintptr_t data) | |
390 { | |
391 u_char *p; | |
392 ngx_http_slice_ctx_t *ctx; | |
393 ngx_http_slice_loc_conf_t *slcf; | |
394 | |
395 ctx = ngx_http_get_module_ctx(r, ngx_http_slice_filter_module); | |
396 | |
397 if (ctx == NULL) { | |
398 if (r != r->main || r->headers_out.status) { | |
399 v->not_found = 1; | |
400 return NGX_OK; | |
401 } | |
402 | |
403 slcf = ngx_http_get_module_loc_conf(r, ngx_http_slice_filter_module); | |
404 | |
405 if (slcf->size == 0) { | |
406 v->not_found = 1; | |
407 return NGX_OK; | |
408 } | |
409 | |
410 ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_slice_ctx_t)); | |
411 if (ctx == NULL) { | |
412 return NGX_ERROR; | |
413 } | |
414 | |
415 ngx_http_set_ctx(r, ctx, ngx_http_slice_filter_module); | |
416 | |
417 p = ngx_pnalloc(r->pool, sizeof("bytes=-") - 1 + 2 * NGX_OFF_T_LEN); | |
418 if (p == NULL) { | |
419 return NGX_ERROR; | |
420 } | |
421 | |
422 ctx->start = slcf->size * (ngx_http_slice_get_start(r) / slcf->size); | |
423 | |
424 ctx->range.data = p; | |
425 ctx->range.len = ngx_sprintf(p, "bytes=%O-%O", ctx->start, | |
426 ctx->start + (off_t) slcf->size - 1) | |
427 - p; | |
428 } | |
429 | |
430 v->data = ctx->range.data; | |
431 v->valid = 1; | |
432 v->not_found = 0; | |
433 v->no_cacheable = 1; | |
434 v->len = ctx->range.len; | |
435 | |
436 return NGX_OK; | |
437 } | |
438 | |
439 | |
440 static off_t | |
441 ngx_http_slice_get_start(ngx_http_request_t *r) | |
442 { | |
443 off_t start, cutoff, cutlim; | |
444 u_char *p; | |
445 ngx_table_elt_t *h; | |
446 | |
447 if (r->headers_in.if_range) { | |
448 return 0; | |
449 } | |
450 | |
451 h = r->headers_in.range; | |
452 | |
453 if (h == NULL | |
454 || h->value.len < 7 | |
455 || ngx_strncasecmp(h->value.data, (u_char *) "bytes=", 6) != 0) | |
456 { | |
457 return 0; | |
458 } | |
459 | |
460 p = h->value.data + 6; | |
461 | |
462 if (ngx_strchr(p, ',')) { | |
463 return 0; | |
464 } | |
465 | |
466 while (*p == ' ') { p++; } | |
467 | |
468 if (*p == '-') { | |
469 return 0; | |
470 } | |
471 | |
472 cutoff = NGX_MAX_OFF_T_VALUE / 10; | |
473 cutlim = NGX_MAX_OFF_T_VALUE % 10; | |
474 | |
475 start = 0; | |
476 | |
477 while (*p >= '0' && *p <= '9') { | |
478 if (start >= cutoff && (start > cutoff || *p - '0' > cutlim)) { | |
479 return 0; | |
480 } | |
481 | |
482 start = start * 10 + *p++ - '0'; | |
483 } | |
484 | |
485 return start; | |
486 } | |
487 | |
488 | |
489 static void * | |
490 ngx_http_slice_create_loc_conf(ngx_conf_t *cf) | |
491 { | |
492 ngx_http_slice_loc_conf_t *slcf; | |
493 | |
494 slcf = ngx_palloc(cf->pool, sizeof(ngx_http_slice_loc_conf_t)); | |
495 if (slcf == NULL) { | |
496 return NULL; | |
497 } | |
498 | |
499 slcf->size = NGX_CONF_UNSET_SIZE; | |
500 | |
501 return slcf; | |
502 } | |
503 | |
504 | |
505 static char * | |
506 ngx_http_slice_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child) | |
507 { | |
508 ngx_http_slice_loc_conf_t *prev = parent; | |
509 ngx_http_slice_loc_conf_t *conf = child; | |
510 | |
511 ngx_conf_merge_size_value(conf->size, prev->size, 0); | |
512 | |
513 return NGX_CONF_OK; | |
514 } | |
515 | |
516 | |
517 static ngx_int_t | |
518 ngx_http_slice_add_variables(ngx_conf_t *cf) | |
519 { | |
520 ngx_http_variable_t *var; | |
521 | |
522 var = ngx_http_add_variable(cf, &ngx_http_slice_range_name, 0); | |
523 if (var == NULL) { | |
524 return NGX_ERROR; | |
525 } | |
526 | |
527 var->get_handler = ngx_http_slice_range_variable; | |
528 | |
529 return NGX_OK; | |
530 } | |
531 | |
532 | |
533 static ngx_int_t | |
534 ngx_http_slice_init(ngx_conf_t *cf) | |
535 { | |
536 ngx_http_next_header_filter = ngx_http_top_header_filter; | |
537 ngx_http_top_header_filter = ngx_http_slice_header_filter; | |
538 | |
539 ngx_http_next_body_filter = ngx_http_top_body_filter; | |
540 ngx_http_top_body_filter = ngx_http_slice_body_filter; | |
541 | |
542 return NGX_OK; | |
543 } |