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_LEVEL_200 7
65
66 /* ngx_null_string, */ /* "300 Multiple Choices" */
67
68 ngx_string("301 Moved Permanently"),
69 ngx_string("302 Moved Temporarily"),
70 ngx_null_string, /* "303 See Other" */
71 ngx_string("304 Not Modified"),
72
73 /* ngx_null_string, */ /* "305 Use Proxy" */
74 /* ngx_null_string, */ /* "306 unused" */
75 /* ngx_null_string, */ /* "307 Temporary Redirect" */
76
77 #define NGX_HTTP_LEVEL_300 4
78
79 ngx_string("400 Bad Request"),
80 ngx_string("401 Unauthorized"),
81 ngx_string("402 Payment Required"),
82 ngx_string("403 Forbidden"),
83 ngx_string("404 Not Found"),
84 ngx_string("405 Not Allowed"),
85 ngx_string("406 Not Acceptable"),
86 ngx_null_string, /* "407 Proxy Authentication Required" */
87 ngx_string("408 Request Time-out"),
88 ngx_string("409 Conflict"),
89 ngx_string("410 Gone"),
90 ngx_string("411 Length Required"),
91 ngx_string("412 Precondition Failed"),
92 ngx_string("413 Request Entity Too Large"),
93 ngx_null_string, /* "414 Request-URI Too Large", but we never send it
94 * because we treat such requests as the HTTP/0.9
95 * requests and send only a body without a header
96 */
97 ngx_string("415 Unsupported Media Type"),
98 ngx_string("416 Requested Range Not Satisfiable"),
99
100 /* ngx_null_string, */ /* "417 Expectation Failed" */
101 /* ngx_null_string, */ /* "418 unused" */
102 /* ngx_null_string, */ /* "419 unused" */
103 /* ngx_null_string, */ /* "420 unused" */
104 /* ngx_null_string, */ /* "421 unused" */
105 /* ngx_null_string, */ /* "422 Unprocessable Entity" */
106 /* ngx_null_string, */ /* "423 Locked" */
107 /* ngx_null_string, */ /* "424 Failed Dependency" */
108
109 #define NGX_HTTP_LEVEL_400 17
110
111 ngx_string("500 Internal Server Error"),
112 ngx_string("501 Method Not Implemented"),
113 ngx_string("502 Bad Gateway"),
114 ngx_string("503 Service Temporarily Unavailable"),
115 ngx_string("504 Gateway Time-out"),
116
117 ngx_null_string, /* "505 HTTP Version Not Supported" */
118 ngx_null_string, /* "506 Variant Also Negotiates" */
119 ngx_string("507 Insufficient Storage"),
120 /* ngx_null_string, */ /* "508 unused" */
121 /* ngx_null_string, */ /* "509 unused" */
122 /* ngx_null_string, */ /* "510 Not Extended" */
123 };
124
125
126 ngx_http_header_out_t ngx_http_headers_out[] = {
127 { ngx_string("Server"), offsetof(ngx_http_headers_out_t, server) },
128 { ngx_string("Date"), offsetof(ngx_http_headers_out_t, date) },
129 #if 0
130 { ngx_string("Content-Type"),
131 offsetof(ngx_http_headers_out_t, content_type) },
132 #endif
133 { ngx_string("Content-Length"),
134 offsetof(ngx_http_headers_out_t, content_length) },
135 { ngx_string("Content-Encoding"),
136 offsetof(ngx_http_headers_out_t, content_encoding) },
137 { ngx_string("Location"), offsetof(ngx_http_headers_out_t, location) },
138 { ngx_string("Last-Modified"),
139 offsetof(ngx_http_headers_out_t, last_modified) },
140 { ngx_string("Accept-Ranges"),
141 offsetof(ngx_http_headers_out_t, accept_ranges) },
142 { ngx_string("Expires"), offsetof(ngx_http_headers_out_t, expires) },
143 { ngx_string("Cache-Control"),
144 offsetof(ngx_http_headers_out_t, cache_control) },
145 { ngx_string("ETag"), offsetof(ngx_http_headers_out_t, etag) },
146
147 { ngx_null_string, 0 }
148 };
149
150
151 static ngx_int_t
152 ngx_http_header_filter(ngx_http_request_t *r)
153 {
154 u_char *p;
155 size_t len;
156 ngx_str_t host;
157 ngx_buf_t *b;
158 ngx_uint_t status, i;
159 ngx_chain_t out;
160 ngx_list_part_t *part;
161 ngx_table_elt_t *header;
162 ngx_http_core_loc_conf_t *clcf;
163 ngx_http_core_srv_conf_t *cscf;
164 /* AF_INET only */
165 u_char addr[INET_ADDRSTRLEN];
166
167 r->header_sent = 1;
168
169 if (r != r->main) {
170 return NGX_OK;
171 }
172
173 if (r->http_version < NGX_HTTP_VERSION_10) {
174 return NGX_OK;
175 }
176
177 if (r->method == NGX_HTTP_HEAD) {
178 r->header_only = 1;
179 }
180
181 if (r->headers_out.last_modified_time != -1) {
182 if (r->headers_out.status != NGX_HTTP_OK
183 && r->headers_out.status != NGX_HTTP_PARTIAL_CONTENT
184 && r->headers_out.status != NGX_HTTP_NOT_MODIFIED)
185 {
186 r->headers_out.last_modified_time = -1;
187 r->headers_out.last_modified = NULL;
188 }
189 }
190
191 len = sizeof("HTTP/1.x ") - 1 + sizeof(CRLF) - 1
192 /* the end of the header */
193 + sizeof(CRLF) - 1;
194
195 /* status line */
196
197 if (r->headers_out.status_line.len) {
198 len += r->headers_out.status_line.len;
199 #if (NGX_SUPPRESS_WARN)
200 status = NGX_INVALID_ARRAY_INDEX;
201 #endif
202
203 } else {
204
205 if (r->headers_out.status < NGX_HTTP_MOVED_PERMANENTLY) {
206 /* 2XX */
207 status = r->headers_out.status - NGX_HTTP_OK;
208
209 if (r->headers_out.status == NGX_HTTP_NO_CONTENT) {
210 r->header_only = 1;
211 r->headers_out.content_type.len = 0;
212 r->headers_out.content_type.data = NULL;
213 r->headers_out.last_modified_time = -1;
214 r->headers_out.last_modified = NULL;
215 r->headers_out.content_length = NULL;
216 r->headers_out.content_length_n = -1;
217 }
218
219 } else if (r->headers_out.status < NGX_HTTP_BAD_REQUEST) {
220 /* 3XX */
221 status = r->headers_out.status - NGX_HTTP_MOVED_PERMANENTLY
222 + NGX_HTTP_LEVEL_200;
223
224 if (r->headers_out.status == NGX_HTTP_NOT_MODIFIED) {
225 r->header_only = 1;
226 }
227
228 } else if (r->headers_out.status < NGX_HTTP_INTERNAL_SERVER_ERROR) {
229 /* 4XX */
230 status = r->headers_out.status - NGX_HTTP_BAD_REQUEST
231 + NGX_HTTP_LEVEL_200
232 + NGX_HTTP_LEVEL_300;
233
234 } else {
235 /* 5XX */
236 status = r->headers_out.status - NGX_HTTP_INTERNAL_SERVER_ERROR
237 + NGX_HTTP_LEVEL_200
238 + NGX_HTTP_LEVEL_300
239 + NGX_HTTP_LEVEL_400;
240 }
241
242 len += ngx_http_status_lines[status].len;
243 }
244
245 clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
246
247 if (r->headers_out.server == NULL) {
248 len += clcf->server_tokens ? sizeof(ngx_http_server_full_string) - 1:
249 sizeof(ngx_http_server_string) - 1;
250 }
251
252 if (r->headers_out.date == NULL) {
253 len += sizeof("Date: Mon, 28 Sep 1970 06:00:00 GMT" CRLF) - 1;
254 }
255
256 if (r->headers_out.content_type.len) {
257 len += sizeof("Content-Type: ") - 1
258 + r->headers_out.content_type.len + 2;
259
260 if (r->headers_out.content_type_len == r->headers_out.content_type.len
261 && r->headers_out.charset.len)
262 {
263 len += sizeof("; charset=") - 1 + r->headers_out.charset.len;
264 }
265 }
266
267 if (r->headers_out.content_length == NULL
268 && r->headers_out.content_length_n >= 0)
269 {
270 len += sizeof("Content-Length: ") - 1 + NGX_OFF_T_LEN + 2;
271 }
272
273 if (r->headers_out.last_modified == NULL
274 && r->headers_out.last_modified_time != -1)
275 {
276 len += sizeof("Last-Modified: Mon, 28 Sep 1970 06:00:00 GMT" CRLF) - 1;
277 }
278
279 if (r->headers_out.location
280 && r->headers_out.location->value.len
281 && r->headers_out.location->value.data[0] == '/')
282 {
283 r->headers_out.location->hash = 0;
284
285 if (clcf->server_name_in_redirect) {
286 cscf = ngx_http_get_module_srv_conf(r, ngx_http_core_module);
287 host = cscf->server_name;
288
289 } else if (r->headers_in.host) {
290 host.len = r->headers_in.host_name_len;
291 host.data = r->headers_in.host->value.data;
292
293 } else {
294 host.data = addr;
295
296 if (ngx_http_server_addr(r, &host) != NGX_OK) {
297 return NGX_ERROR;
298 }
299 }
300
301 #if (NGX_HTTP_SSL)
302 if (r->connection->ssl) {
303 len += sizeof("Location: https://") - 1
304 + host.len
305 + r->headers_out.location->value.len + 2;
306
307 if (clcf->port_in_redirect && r->port != 443) {
308 len += r->port_text->len;
309 }
310
311 } else
312 #endif
313 {
314 len += sizeof("Location: http://") - 1
315 + host.len
316 + r->headers_out.location->value.len + 2;
317
318 if (clcf->port_in_redirect && r->port != 80) {
319 len += r->port_text->len;
320 }
321 }
322
323 } else {
324 host.len = 0;
325 host.data = NULL;
326 }
327
328 if (r->chunked) {
329 len += sizeof("Transfer-Encoding: chunked" CRLF) - 1;
330 }
331
332 if (r->keepalive) {
333 len += sizeof("Connection: keep-alive" CRLF) - 1;
334
335 /*
336 * MSIE and Opera ignore the "Keep-Alive: timeout=<N>" header.
337 * MSIE keeps the connection alive for about 60-65 seconds.
338 * Opera keeps the connection alive very long.
339 * Mozilla keeps the connection alive for N plus about 1-10 seconds.
340 * Konqueror keeps the connection alive for about N seconds.
341 */
342
343 if (clcf->keepalive_header) {
344 len += sizeof("Keep-Alive: timeout=") - 1 + NGX_TIME_T_LEN + 2;
345 }
346
347 } else {
348 len += sizeof("Connection: closed" CRLF) - 1;
349 }
350
351 part = &r->headers_out.headers.part;
352 header = part->elts;
353
354 for (i = 0; /* void */; i++) {
355
356 if (i >= part->nelts) {
357 if (part->next == NULL) {
358 break;
359 }
360
361 part = part->next;
362 header = part->elts;
363 i = 0;
364 }
365
366 if (header[i].hash == 0) {
367 continue;
368 }
369
370 len += header[i].key.len + sizeof(": ") - 1 + header[i].value.len
371 + sizeof(CRLF) - 1;
372 }
373
374 b = ngx_create_temp_buf(r->pool, len);
375 if (b == NULL) {
376 return NGX_ERROR;
377 }
378
379 /* "HTTP/1.x " */
380 b->last = ngx_cpymem(b->last, "HTTP/1.1 ", sizeof("HTTP/1.x ") - 1);
381
382 /* status line */
383 if (r->headers_out.status_line.len) {
384 b->last = ngx_copy(b->last, r->headers_out.status_line.data,
385 r->headers_out.status_line.len);
386
387 } else {
388 b->last = ngx_copy(b->last, ngx_http_status_lines[status].data,
389 ngx_http_status_lines[status].len);
390 }
391 *b->last++ = CR; *b->last++ = LF;
392
393 if (r->headers_out.server == NULL) {
394 if (clcf->server_tokens) {
395 p = (u_char *) ngx_http_server_full_string;
396 len = sizeof(ngx_http_server_full_string) - 1;
397
398 } else {
399 p = (u_char *) ngx_http_server_string;
400 len = sizeof(ngx_http_server_string) - 1;
401 }
402
403 b->last = ngx_cpymem(b->last, p, len);
404 }
405
406 if (r->headers_out.date == NULL) {
407 b->last = ngx_cpymem(b->last, "Date: ", sizeof("Date: ") - 1);
408 b->last = ngx_cpymem(b->last, ngx_cached_http_time.data,
409 ngx_cached_http_time.len);
410
411 *b->last++ = CR; *b->last++ = LF;
412 }
413
414 if (r->headers_out.content_type.len) {
415 b->last = ngx_cpymem(b->last, "Content-Type: ",
416 sizeof("Content-Type: ") - 1);
417 p = b->last;
418 b->last = ngx_copy(b->last, r->headers_out.content_type.data,
419 r->headers_out.content_type.len);
420
421 if (r->headers_out.content_type_len == r->headers_out.content_type.len
422 && r->headers_out.charset.len)
423 {
424 b->last = ngx_cpymem(b->last, "; charset=",
425 sizeof("; charset=") - 1);
426 b->last = ngx_copy(b->last, r->headers_out.charset.data,
427 r->headers_out.charset.len);
428
429 /* update r->headers_out.content_type for possible logging */
430
431 r->headers_out.content_type.len = b->last - p;
432 r->headers_out.content_type.data = p;
433 }
434
435 *b->last++ = CR; *b->last++ = LF;
436 }
437
438 if (r->headers_out.content_length == NULL
439 && r->headers_out.content_length_n >= 0)
440 {
441 b->last = ngx_sprintf(b->last, "Content-Length: %O" CRLF,
442 r->headers_out.content_length_n);
443 }
444
445 if (r->headers_out.last_modified == NULL
446 && r->headers_out.last_modified_time != -1)
447 {
448 b->last = ngx_cpymem(b->last, "Last-Modified: ",
449 sizeof("Last-Modified: ") - 1);
450 b->last = ngx_http_time(b->last, r->headers_out.last_modified_time);
451
452 *b->last++ = CR; *b->last++ = LF;
453 }
454
455 if (host.data) {
456
457 p = b->last + sizeof("Location: ") - 1;
458
459 b->last = ngx_cpymem(b->last, "Location: http",
460 sizeof("Location: http") - 1);
461
462 #if (NGX_HTTP_SSL)
463 if (r->connection->ssl) {
464 *b->last++ ='s';
465 }
466 #endif
467
468 *b->last++ = ':'; *b->last++ = '/'; *b->last++ = '/';
469 b->last = ngx_copy(b->last, host.data, host.len);
470
471 if (clcf->port_in_redirect) {
472 #if (NGX_HTTP_SSL)
473 if (r->connection->ssl) {
474 if (r->port != 443) {
475 b->last = ngx_copy(b->last, r->port_text->data,
476 r->port_text->len);
477 }
478 } else
479 #endif
480 {
481 if (r->port != 80) {
482 b->last = ngx_copy(b->last, r->port_text->data,
483 r->port_text->len);
484 }
485 }
486 }
487
488 b->last = ngx_copy(b->last, r->headers_out.location->value.data,
489 r->headers_out.location->value.len);
490
491 /* update r->headers_out.location->value for possible logging */
492
493 r->headers_out.location->value.len = b->last - p;
494 r->headers_out.location->value.data = p;
495 r->headers_out.location->key.len = sizeof("Location: ") - 1;
496 r->headers_out.location->key.data = (u_char *) "Location: ";
497
498 *b->last++ = CR; *b->last++ = LF;
499 }
500
501 if (r->chunked) {
502 b->last = ngx_cpymem(b->last, "Transfer-Encoding: chunked" CRLF,
503 sizeof("Transfer-Encoding: chunked" CRLF) - 1);
504 }
505
506 if (r->keepalive) {
507 b->last = ngx_cpymem(b->last, "Connection: keep-alive" CRLF,
508 sizeof("Connection: keep-alive" CRLF) - 1);
509
510 if (clcf->keepalive_header) {
511 b->last = ngx_sprintf(b->last, "Keep-Alive: timeout=%T" CRLF,
512 clcf->keepalive_header);
513 }
514
515 } else {
516 b->last = ngx_cpymem(b->last, "Connection: close" CRLF,
517 sizeof("Connection: close" CRLF) - 1);
518 }
519
520 part = &r->headers_out.headers.part;
521 header = part->elts;
522
523 for (i = 0; /* void */; i++) {
524
525 if (i >= part->nelts) {
526 if (part->next == NULL) {
527 break;
528 }
529
530 part = part->next;
531 header = part->elts;
532 i = 0;
533 }
534
535 if (header[i].hash == 0) {
536 continue;
537 }
538
539 b->last = ngx_copy(b->last, header[i].key.data, header[i].key.len);
540 *b->last++ = ':' ; *b->last++ = ' ' ;
541
542 b->last = ngx_copy(b->last, header[i].value.data, header[i].value.len);
543 *b->last++ = CR; *b->last++ = LF;
544 }
545
546 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
547 "%*s\n", (size_t) (b->last - b->pos), b->pos);
548
549 /* the end of HTTP header */
550 *b->last++ = CR; *b->last++ = LF;
551
552 r->header_size = b->last - b->pos;
553
554 if (r->header_only) {
555 b->last_buf = 1;
556 }
557
558 out.buf = b;
559 out.next = NULL;
560
561 return ngx_http_write_filter(r, &out);
562 }
563
564
565 static ngx_int_t
566 ngx_http_header_filter_init(ngx_conf_t *cf)
567 {
568 ngx_http_top_header_filter = ngx_http_header_filter;
569
570 return NGX_OK;
571 }
572
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