1
2 /*
3 * Copyright (C) Igor Sysoev
4 */
5
6
7 #include <ngx_config.h>
8 #include <ngx_core.h>
9 #include <ngx_http.h>
10 #include <nginx.h>
11
12
13 static ngx_int_t ngx_http_header_filter_init(ngx_conf_t *cf);
14 static ngx_int_t ngx_http_header_filter(ngx_http_request_t *r);
15
16
17 static ngx_http_module_t ngx_http_header_filter_module_ctx = {
18 NULL, /* preconfiguration */
19 ngx_http_header_filter_init, /* postconfiguration */
20
21 NULL, /* create main configuration */
22 NULL, /* init main configuration */
23
24 NULL, /* create server configuration */
25 NULL, /* merge server configuration */
26
27 NULL, /* create location configuration */
28 NULL, /* merge location configuration */
29 };
30
31
32 ngx_module_t ngx_http_header_filter_module = {
33 NGX_MODULE_V1,
34 &ngx_http_header_filter_module_ctx, /* module context */
35 NULL, /* module directives */
36 NGX_HTTP_MODULE, /* module type */
37 NULL, /* init master */
38 NULL, /* init module */
39 NULL, /* init process */
40 NULL, /* init thread */
41 NULL, /* exit thread */
42 NULL, /* exit process */
43 NULL, /* exit master */
44 NGX_MODULE_V1_PADDING
45 };
46
47
48 static char ngx_http_server_string[] = "Server: nginx" CRLF;
49 static char ngx_http_server_full_string[] = "Server: " NGINX_VER CRLF;
50
51
52 static ngx_str_t ngx_http_status_lines[] = {
53
54 ngx_string("200 OK"),
55 ngx_string("201 Created"),
56 ngx_null_string, /* "202 Accepted" */
57 ngx_null_string, /* "203 Non-Authoritative Information" */
58 ngx_string("204 No Content"),
59 ngx_null_string, /* "205 Reset Content" */
60 ngx_string("206 Partial Content"),
61
62 /* ngx_null_string, */ /* "207 Multi-Status" */
63
64 #define NGX_HTTP_LAST_LEVEL_200 207
65 #define NGX_HTTP_LEVEL_200 (NGX_HTTP_LAST_LEVEL_200 - 200)
66
67 /* ngx_null_string, */ /* "300 Multiple Choices" */
68
69 ngx_string("301 Moved Permanently"),
70 ngx_string("302 Moved Temporarily"),
71 ngx_null_string, /* "303 See Other" */
72 ngx_string("304 Not Modified"),
73
74 /* ngx_null_string, */ /* "305 Use Proxy" */
75 /* ngx_null_string, */ /* "306 unused" */
76 /* ngx_null_string, */ /* "307 Temporary Redirect" */
77
78 #define NGX_HTTP_LAST_LEVEL_300 305
79 #define NGX_HTTP_LEVEL_300 (NGX_HTTP_LAST_LEVEL_300 - 301)
80
81 ngx_string("400 Bad Request"),
82 ngx_string("401 Unauthorized"),
83 ngx_string("402 Payment Required"),
84 ngx_string("403 Forbidden"),
85 ngx_string("404 Not Found"),
86 ngx_string("405 Not Allowed"),
87 ngx_string("406 Not Acceptable"),
88 ngx_null_string, /* "407 Proxy Authentication Required" */
89 ngx_string("408 Request Time-out"),
90 ngx_string("409 Conflict"),
91 ngx_string("410 Gone"),
92 ngx_string("411 Length Required"),
93 ngx_string("412 Precondition Failed"),
94 ngx_string("413 Request Entity Too Large"),
95 ngx_null_string, /* "414 Request-URI Too Large", but we never send it
96 * because we treat such requests as the HTTP/0.9
97 * requests and send only a body without a header
98 */
99 ngx_string("415 Unsupported Media Type"),
100 ngx_string("416 Requested Range Not Satisfiable"),
101
102 /* ngx_null_string, */ /* "417 Expectation Failed" */
103 /* ngx_null_string, */ /* "418 unused" */
104 /* ngx_null_string, */ /* "419 unused" */
105 /* ngx_null_string, */ /* "420 unused" */
106 /* ngx_null_string, */ /* "421 unused" */
107 /* ngx_null_string, */ /* "422 Unprocessable Entity" */
108 /* ngx_null_string, */ /* "423 Locked" */
109 /* ngx_null_string, */ /* "424 Failed Dependency" */
110
111 #define NGX_HTTP_LAST_LEVEL_400 417
112 #define NGX_HTTP_LEVEL_400 (NGX_HTTP_LAST_LEVEL_400 - 400)
113
114 ngx_string("500 Internal Server Error"),
115 ngx_string("501 Method Not Implemented"),
116 ngx_string("502 Bad Gateway"),
117 ngx_string("503 Service Temporarily Unavailable"),
118 ngx_string("504 Gateway Time-out"),
119
120 ngx_null_string, /* "505 HTTP Version Not Supported" */
121 ngx_null_string, /* "506 Variant Also Negotiates" */
122 ngx_string("507 Insufficient Storage"),
123 /* ngx_null_string, */ /* "508 unused" */
124 /* ngx_null_string, */ /* "509 unused" */
125 /* ngx_null_string, */ /* "510 Not Extended" */
126
127 #define NGX_HTTP_LAST_LEVEL_500 508
128
129 };
130
131
132 ngx_http_header_out_t ngx_http_headers_out[] = {
133 { ngx_string("Server"), offsetof(ngx_http_headers_out_t, server) },
134 { ngx_string("Date"), offsetof(ngx_http_headers_out_t, date) },
135 #if 0
136 { ngx_string("Content-Type"),
137 offsetof(ngx_http_headers_out_t, content_type) },
138 #endif
139 { ngx_string("Content-Length"),
140 offsetof(ngx_http_headers_out_t, content_length) },
141 { ngx_string("Content-Encoding"),
142 offsetof(ngx_http_headers_out_t, content_encoding) },
143 { ngx_string("Location"), offsetof(ngx_http_headers_out_t, location) },
144 { ngx_string("Last-Modified"),
145 offsetof(ngx_http_headers_out_t, last_modified) },
146 { ngx_string("Accept-Ranges"),
147 offsetof(ngx_http_headers_out_t, accept_ranges) },
148 { ngx_string("Expires"), offsetof(ngx_http_headers_out_t, expires) },
149 { ngx_string("Cache-Control"),
150 offsetof(ngx_http_headers_out_t, cache_control) },
151 { ngx_string("ETag"), offsetof(ngx_http_headers_out_t, etag) },
152
153 { ngx_null_string, 0 }
154 };
155
156
157 static ngx_int_t
158 ngx_http_header_filter(ngx_http_request_t *r)
159 {
160 u_char *p;
161 size_t len;
162 ngx_str_t host, *status_line;
163 ngx_buf_t *b;
164 ngx_uint_t status, i, port;
165 ngx_chain_t out;
166 ngx_list_part_t *part;
167 ngx_table_elt_t *header;
168 ngx_connection_t *c;
169 ngx_http_core_loc_conf_t *clcf;
170 ngx_http_core_srv_conf_t *cscf;
171 struct sockaddr_in *sin;
172 #if (NGX_HAVE_INET6)
173 struct sockaddr_in6 *sin6;
174 #endif
175 u_char addr[NGX_SOCKADDR_STRLEN];
176
177 r->header_sent = 1;
178
179 if (r != r->main) {
180 return NGX_OK;
181 }
182
183 if (r->http_version < NGX_HTTP_VERSION_10) {
184 return NGX_OK;
185 }
186
187 if (r->method == NGX_HTTP_HEAD) {
188 r->header_only = 1;
189 }
190
191 if (r->headers_out.last_modified_time != -1) {
192 if (r->headers_out.status != NGX_HTTP_OK
193 && r->headers_out.status != NGX_HTTP_PARTIAL_CONTENT
194 && r->headers_out.status != NGX_HTTP_NOT_MODIFIED)
195 {
196 r->headers_out.last_modified_time = -1;
197 r->headers_out.last_modified = NULL;
198 }
199 }
200
201 len = sizeof("HTTP/1.x ") - 1 + sizeof(CRLF) - 1
202 /* the end of the header */
203 + sizeof(CRLF) - 1;
204
205 /* status line */
206
207 if (r->headers_out.status_line.len) {
208 len += r->headers_out.status_line.len;
209 status_line = &r->headers_out.status_line;
210 #if (NGX_SUPPRESS_WARN)
211 status = 0;
212 #endif
213
214 } else {
215
216 status = r->headers_out.status;
217
218 if (status >= NGX_HTTP_OK
219 && status < NGX_HTTP_LAST_LEVEL_200)
220 {
221 /* 2XX */
222
223 if (status == NGX_HTTP_NO_CONTENT) {
224 r->header_only = 1;
225 r->headers_out.content_type.len = 0;
226 r->headers_out.content_type.data = NULL;
227 r->headers_out.last_modified_time = -1;
228 r->headers_out.last_modified = NULL;
229 r->headers_out.content_length = NULL;
230 r->headers_out.content_length_n = -1;
231 }
232
233 status -= NGX_HTTP_OK;
234 status_line = &ngx_http_status_lines[status];
235 len += ngx_http_status_lines[status].len;
236
237 } else if (status >= NGX_HTTP_MOVED_PERMANENTLY
238 && status < NGX_HTTP_LAST_LEVEL_300)
239 {
240 /* 3XX */
241
242 if (status == NGX_HTTP_NOT_MODIFIED) {
243 r->header_only = 1;
244 }
245
246 status = status - NGX_HTTP_MOVED_PERMANENTLY + NGX_HTTP_LEVEL_200;
247 status_line = &ngx_http_status_lines[status];
248 len += ngx_http_status_lines[status].len;
249
250 } else if (status >= NGX_HTTP_BAD_REQUEST
251 && status < NGX_HTTP_LAST_LEVEL_400)
252 {
253 /* 4XX */
254 status = status - NGX_HTTP_BAD_REQUEST
255 + NGX_HTTP_LEVEL_200
256 + NGX_HTTP_LEVEL_300;
257
258 status_line = &ngx_http_status_lines[status];
259 len += ngx_http_status_lines[status].len;
260
261 } else if (status >= NGX_HTTP_INTERNAL_SERVER_ERROR
262 && status < NGX_HTTP_LAST_LEVEL_500)
263 {
264 /* 5XX */
265 status = status - NGX_HTTP_INTERNAL_SERVER_ERROR
266 + NGX_HTTP_LEVEL_200
267 + NGX_HTTP_LEVEL_300
268 + NGX_HTTP_LEVEL_400;
269
270 status_line = &ngx_http_status_lines[status];
271 len += ngx_http_status_lines[status].len;
272
273 } else {
274 len += NGX_INT_T_LEN;
275 status_line = NULL;
276 }
277 }
278
279 clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
280
281 if (r->headers_out.server == NULL) {
282 len += clcf->server_tokens ? sizeof(ngx_http_server_full_string) - 1:
283 sizeof(ngx_http_server_string) - 1;
284 }
285
286 if (r->headers_out.date == NULL) {
287 len += sizeof("Date: Mon, 28 Sep 1970 06:00:00 GMT" CRLF) - 1;
288 }
289
290 if (r->headers_out.content_type.len) {
291 len += sizeof("Content-Type: ") - 1
292 + r->headers_out.content_type.len + 2;
293
294 if (r->headers_out.content_type_len == r->headers_out.content_type.len
295 && r->headers_out.charset.len)
296 {
297 len += sizeof("; charset=") - 1 + r->headers_out.charset.len;
298 }
299 }
300
301 if (r->headers_out.content_length == NULL
302 && r->headers_out.content_length_n >= 0)
303 {
304 len += sizeof("Content-Length: ") - 1 + NGX_OFF_T_LEN + 2;
305 }
306
307 if (r->headers_out.last_modified == NULL
308 && r->headers_out.last_modified_time != -1)
309 {
310 len += sizeof("Last-Modified: Mon, 28 Sep 1970 06:00:00 GMT" CRLF) - 1;
311 }
312
313 c = r->connection;
314
315 if (r->headers_out.location
316 && r->headers_out.location->value.len
317 && r->headers_out.location->value.data[0] == '/')
318 {
319 r->headers_out.location->hash = 0;
320
321 if (clcf->server_name_in_redirect) {
322 cscf = ngx_http_get_module_srv_conf(r, ngx_http_core_module);
323 host = cscf->server_name;
324
325 } else if (r->headers_in.server.len) {
326 host = r->headers_in.server;
327
328 } else {
329 host.len = NGX_SOCKADDR_STRLEN;
330 host.data = addr;
331
332 if (ngx_connection_local_sockaddr(c, &host, 0) != NGX_OK) {
333 return NGX_ERROR;
334 }
335 }
336
337 switch (c->local_sockaddr->sa_family) {
338
339 #if (NGX_HAVE_INET6)
340 case AF_INET6:
341 sin6 = (struct sockaddr_in6 *) c->local_sockaddr;
342 port = ntohs(sin6->sin6_port);
343 break;
344 #endif
345 default: /* AF_INET */
346 sin = (struct sockaddr_in *) c->local_sockaddr;
347 port = ntohs(sin->sin_port);
348 break;
349 }
350
351 len += sizeof("Location: https://") - 1
352 + host.len
353 + r->headers_out.location->value.len + 2;
354
355 if (clcf->port_in_redirect) {
356
357 #if (NGX_HTTP_SSL)
358 if (c->ssl)
359 port = (port == 443) ? 0 : port;
360 else
361 #endif
362 port = (port == 80) ? 0 : port;
363
364 } else {
365 port = 0;
366 }
367
368 if (port) {
369 len += sizeof(":65535") - 1;
370 }
371
372 } else {
373 host.len = 0;
374 host.data = NULL;
375 port = 0;
376 }
377
378 if (r->chunked) {
379 len += sizeof("Transfer-Encoding: chunked" CRLF) - 1;
380 }
381
382 if (r->keepalive) {
383 len += sizeof("Connection: keep-alive" CRLF) - 1;
384
385 /*
386 * MSIE and Opera ignore the "Keep-Alive: timeout=<N>" header.
387 * MSIE keeps the connection alive for about 60-65 seconds.
388 * Opera keeps the connection alive very long.
389 * Mozilla keeps the connection alive for N plus about 1-10 seconds.
390 * Konqueror keeps the connection alive for about N seconds.
391 */
392
393 if (clcf->keepalive_header) {
394 len += sizeof("Keep-Alive: timeout=") - 1 + NGX_TIME_T_LEN + 2;
395 }
396
397 } else {
398 len += sizeof("Connection: closed" CRLF) - 1;
399 }
400
401 #if (NGX_HTTP_GZIP)
402 if (r->gzip && clcf->gzip_vary) {
403 len += sizeof("Vary: Accept-Encoding" CRLF) - 1;
404 }
405 #endif
406
407 part = &r->headers_out.headers.part;
408 header = part->elts;
409
410 for (i = 0; /* void */; i++) {
411
412 if (i >= part->nelts) {
413 if (part->next == NULL) {
414 break;
415 }
416
417 part = part->next;
418 header = part->elts;
419 i = 0;
420 }
421
422 if (header[i].hash == 0) {
423 continue;
424 }
425
426 len += header[i].key.len + sizeof(": ") - 1 + header[i].value.len
427 + sizeof(CRLF) - 1;
428 }
429
430 b = ngx_create_temp_buf(r->pool, len);
431 if (b == NULL) {
432 return NGX_ERROR;
433 }
434
435 /* "HTTP/1.x " */
436 b->last = ngx_cpymem(b->last, "HTTP/1.1 ", sizeof("HTTP/1.x ") - 1);
437
438 /* status line */
439 if (status_line) {
440 b->last = ngx_copy(b->last, status_line->data, status_line->len);
441
442 } else {
443 b->last = ngx_sprintf(b->last, "%ui", status);
444 }
445 *b->last++ = CR; *b->last++ = LF;
446
447 if (r->headers_out.server == NULL) {
448 if (clcf->server_tokens) {
449 p = (u_char *) ngx_http_server_full_string;
450 len = sizeof(ngx_http_server_full_string) - 1;
451
452 } else {
453 p = (u_char *) ngx_http_server_string;
454 len = sizeof(ngx_http_server_string) - 1;
455 }
456
457 b->last = ngx_cpymem(b->last, p, len);
458 }
459
460 if (r->headers_out.date == NULL) {
461 b->last = ngx_cpymem(b->last, "Date: ", sizeof("Date: ") - 1);
462 b->last = ngx_cpymem(b->last, ngx_cached_http_time.data,
463 ngx_cached_http_time.len);
464
465 *b->last++ = CR; *b->last++ = LF;
466 }
467
468 if (r->headers_out.content_type.len) {
469 b->last = ngx_cpymem(b->last, "Content-Type: ",
470 sizeof("Content-Type: ") - 1);
471 p = b->last;
472 b->last = ngx_copy(b->last, r->headers_out.content_type.data,
473 r->headers_out.content_type.len);
474
475 if (r->headers_out.content_type_len == r->headers_out.content_type.len
476 && r->headers_out.charset.len)
477 {
478 b->last = ngx_cpymem(b->last, "; charset=",
479 sizeof("; charset=") - 1);
480 b->last = ngx_copy(b->last, r->headers_out.charset.data,
481 r->headers_out.charset.len);
482
483 /* update r->headers_out.content_type for possible logging */
484
485 r->headers_out.content_type.len = b->last - p;
486 r->headers_out.content_type.data = p;
487 }
488
489 *b->last++ = CR; *b->last++ = LF;
490 }
491
492 if (r->headers_out.content_length == NULL
493 && r->headers_out.content_length_n >= 0)
494 {
495 b->last = ngx_sprintf(b->last, "Content-Length: %O" CRLF,
496 r->headers_out.content_length_n);
497 }
498
499 if (r->headers_out.last_modified == NULL
500 && r->headers_out.last_modified_time != -1)
501 {
502 b->last = ngx_cpymem(b->last, "Last-Modified: ",
503 sizeof("Last-Modified: ") - 1);
504 b->last = ngx_http_time(b->last, r->headers_out.last_modified_time);
505
506 *b->last++ = CR; *b->last++ = LF;
507 }
508
509 if (host.data) {
510
511 p = b->last + sizeof("Location: ") - 1;
512
513 b->last = ngx_cpymem(b->last, "Location: http",
514 sizeof("Location: http") - 1);
515
516 #if (NGX_HTTP_SSL)
517 if (c->ssl) {
518 *b->last++ ='s';
519 }
520 #endif
521
522 *b->last++ = ':'; *b->last++ = '/'; *b->last++ = '/';
523 b->last = ngx_copy(b->last, host.data, host.len);
524
525 if (port) {
526 b->last = ngx_sprintf(b->last, ":%ui", port);
527 }
528
529 b->last = ngx_copy(b->last, r->headers_out.location->value.data,
530 r->headers_out.location->value.len);
531
532 /* update r->headers_out.location->value for possible logging */
533
534 r->headers_out.location->value.len = b->last - p;
535 r->headers_out.location->value.data = p;
536 r->headers_out.location->key.len = sizeof("Location: ") - 1;
537 r->headers_out.location->key.data = (u_char *) "Location: ";
538
539 *b->last++ = CR; *b->last++ = LF;
540 }
541
542 if (r->chunked) {
543 b->last = ngx_cpymem(b->last, "Transfer-Encoding: chunked" CRLF,
544 sizeof("Transfer-Encoding: chunked" CRLF) - 1);
545 }
546
547 if (r->keepalive) {
548 b->last = ngx_cpymem(b->last, "Connection: keep-alive" CRLF,
549 sizeof("Connection: keep-alive" CRLF) - 1);
550
551 if (clcf->keepalive_header) {
552 b->last = ngx_sprintf(b->last, "Keep-Alive: timeout=%T" CRLF,
553 clcf->keepalive_header);
554 }
555
556 } else {
557 b->last = ngx_cpymem(b->last, "Connection: close" CRLF,
558 sizeof("Connection: close" CRLF) - 1);
559 }
560
561 #if (NGX_HTTP_GZIP)
562 if (r->gzip && clcf->gzip_vary) {
563 b->last = ngx_cpymem(b->last, "Vary: Accept-Encoding" CRLF,
564 sizeof("Vary: Accept-Encoding" CRLF) - 1);
565 }
566 #endif
567
568 part = &r->headers_out.headers.part;
569 header = part->elts;
570
571 for (i = 0; /* void */; i++) {
572
573 if (i >= part->nelts) {
574 if (part->next == NULL) {
575 break;
576 }
577
578 part = part->next;
579 header = part->elts;
580 i = 0;
581 }
582
583 if (header[i].hash == 0) {
584 continue;
585 }
586
587 b->last = ngx_copy(b->last, header[i].key.data, header[i].key.len);
588 *b->last++ = ':'; *b->last++ = ' ';
589
590 b->last = ngx_copy(b->last, header[i].value.data, header[i].value.len);
591 *b->last++ = CR; *b->last++ = LF;
592 }
593
594 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, c->log, 0,
595 "%*s", (size_t) (b->last - b->pos), b->pos);
596
597 /* the end of HTTP header */
598 *b->last++ = CR; *b->last++ = LF;
599
600 r->header_size = b->last - b->pos;
601
602 if (r->header_only) {
603 b->last_buf = 1;
604 }
605
606 out.buf = b;
607 out.next = NULL;
608
609 return ngx_http_write_filter(r, &out);
610 }
611
612
613 static ngx_int_t
614 ngx_http_header_filter_init(ngx_conf_t *cf)
615 {
616 ngx_http_top_header_filter = ngx_http_header_filter;
617
618 return NGX_OK;
619 }
620
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