Annotation of embedaddon/nginx/src/http/ngx_http_header_filter_module.c, revision 1.1.1.1
1.1 misho 1:
2: /*
3: * Copyright (C) Igor Sysoev
4: * Copyright (C) Nginx, Inc.
5: */
6:
7:
8: #include <ngx_config.h>
9: #include <ngx_core.h>
10: #include <ngx_http.h>
11: #include <nginx.h>
12:
13:
14: static ngx_int_t ngx_http_header_filter_init(ngx_conf_t *cf);
15: static ngx_int_t ngx_http_header_filter(ngx_http_request_t *r);
16:
17:
18: static ngx_http_module_t ngx_http_header_filter_module_ctx = {
19: NULL, /* preconfiguration */
20: ngx_http_header_filter_init, /* postconfiguration */
21:
22: NULL, /* create main configuration */
23: NULL, /* init main configuration */
24:
25: NULL, /* create server configuration */
26: NULL, /* merge server configuration */
27:
28: NULL, /* create location configuration */
29: NULL, /* merge location configuration */
30: };
31:
32:
33: ngx_module_t ngx_http_header_filter_module = {
34: NGX_MODULE_V1,
35: &ngx_http_header_filter_module_ctx, /* module context */
36: NULL, /* module directives */
37: NGX_HTTP_MODULE, /* module type */
38: NULL, /* init master */
39: NULL, /* init module */
40: NULL, /* init process */
41: NULL, /* init thread */
42: NULL, /* exit thread */
43: NULL, /* exit process */
44: NULL, /* exit master */
45: NGX_MODULE_V1_PADDING
46: };
47:
48:
49: static char ngx_http_server_string[] = "Server: nginx" CRLF;
50: static char ngx_http_server_full_string[] = "Server: " NGINX_VER CRLF;
51:
52:
53: static ngx_str_t ngx_http_status_lines[] = {
54:
55: ngx_string("200 OK"),
56: ngx_string("201 Created"),
57: ngx_string("202 Accepted"),
58: ngx_null_string, /* "203 Non-Authoritative Information" */
59: ngx_string("204 No Content"),
60: ngx_null_string, /* "205 Reset Content" */
61: ngx_string("206 Partial Content"),
62:
63: /* ngx_null_string, */ /* "207 Multi-Status" */
64:
65: #define NGX_HTTP_LAST_2XX 207
66: #define NGX_HTTP_OFF_3XX (NGX_HTTP_LAST_2XX - 200)
67:
68: /* ngx_null_string, */ /* "300 Multiple Choices" */
69:
70: ngx_string("301 Moved Permanently"),
71: ngx_string("302 Moved Temporarily"),
72: ngx_string("303 See Other"),
73: ngx_string("304 Not Modified"),
74: ngx_null_string, /* "305 Use Proxy" */
75: ngx_null_string, /* "306 unused" */
76: ngx_string("307 Temporary Redirect"),
77:
78: #define NGX_HTTP_LAST_3XX 308
79: #define NGX_HTTP_OFF_4XX (NGX_HTTP_LAST_3XX - 301 + NGX_HTTP_OFF_3XX)
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_4XX 417
112: #define NGX_HTTP_OFF_5XX (NGX_HTTP_LAST_4XX - 400 + NGX_HTTP_OFF_4XX)
113:
114: ngx_string("500 Internal Server Error"),
115: ngx_string("501 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_5XX 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: { ngx_string("Content-Length"),
136: offsetof(ngx_http_headers_out_t, content_length) },
137: { ngx_string("Content-Encoding"),
138: offsetof(ngx_http_headers_out_t, content_encoding) },
139: { ngx_string("Location"), offsetof(ngx_http_headers_out_t, location) },
140: { ngx_string("Last-Modified"),
141: offsetof(ngx_http_headers_out_t, last_modified) },
142: { ngx_string("Accept-Ranges"),
143: offsetof(ngx_http_headers_out_t, accept_ranges) },
144: { ngx_string("Expires"), offsetof(ngx_http_headers_out_t, expires) },
145: { ngx_string("Cache-Control"),
146: offsetof(ngx_http_headers_out_t, cache_control) },
147: { ngx_string("ETag"), offsetof(ngx_http_headers_out_t, etag) },
148:
149: { ngx_null_string, 0 }
150: };
151:
152:
153: static ngx_int_t
154: ngx_http_header_filter(ngx_http_request_t *r)
155: {
156: u_char *p;
157: size_t len;
158: ngx_str_t host, *status_line;
159: ngx_buf_t *b;
160: ngx_uint_t status, i, port;
161: ngx_chain_t out;
162: ngx_list_part_t *part;
163: ngx_table_elt_t *header;
164: ngx_connection_t *c;
165: ngx_http_core_loc_conf_t *clcf;
166: ngx_http_core_srv_conf_t *cscf;
167: struct sockaddr_in *sin;
168: #if (NGX_HAVE_INET6)
169: struct sockaddr_in6 *sin6;
170: #endif
171: u_char addr[NGX_SOCKADDR_STRLEN];
172:
173: if (r->header_sent) {
174: return NGX_OK;
175: }
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_2XX)
220: {
221: /* 2XX */
222:
223: if (status == NGX_HTTP_NO_CONTENT) {
224: r->header_only = 1;
225: ngx_str_null(&r->headers_out.content_type);
226: r->headers_out.last_modified_time = -1;
227: r->headers_out.last_modified = NULL;
228: r->headers_out.content_length = NULL;
229: r->headers_out.content_length_n = -1;
230: }
231:
232: status -= NGX_HTTP_OK;
233: status_line = &ngx_http_status_lines[status];
234: len += ngx_http_status_lines[status].len;
235:
236: } else if (status >= NGX_HTTP_MOVED_PERMANENTLY
237: && status < NGX_HTTP_LAST_3XX)
238: {
239: /* 3XX */
240:
241: if (status == NGX_HTTP_NOT_MODIFIED) {
242: r->header_only = 1;
243: }
244:
245: status = status - NGX_HTTP_MOVED_PERMANENTLY + NGX_HTTP_OFF_3XX;
246: status_line = &ngx_http_status_lines[status];
247: len += ngx_http_status_lines[status].len;
248:
249: } else if (status >= NGX_HTTP_BAD_REQUEST
250: && status < NGX_HTTP_LAST_4XX)
251: {
252: /* 4XX */
253: status = status - NGX_HTTP_BAD_REQUEST
254: + NGX_HTTP_OFF_4XX;
255:
256: status_line = &ngx_http_status_lines[status];
257: len += ngx_http_status_lines[status].len;
258:
259: } else if (status >= NGX_HTTP_INTERNAL_SERVER_ERROR
260: && status < NGX_HTTP_LAST_5XX)
261: {
262: /* 5XX */
263: status = status - NGX_HTTP_INTERNAL_SERVER_ERROR
264: + NGX_HTTP_OFF_5XX;
265:
266: status_line = &ngx_http_status_lines[status];
267: len += ngx_http_status_lines[status].len;
268:
269: } else {
270: len += NGX_INT_T_LEN;
271: status_line = NULL;
272: }
273: }
274:
275: clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
276:
277: if (r->headers_out.server == NULL) {
278: len += clcf->server_tokens ? sizeof(ngx_http_server_full_string) - 1:
279: sizeof(ngx_http_server_string) - 1;
280: }
281:
282: if (r->headers_out.date == NULL) {
283: len += sizeof("Date: Mon, 28 Sep 1970 06:00:00 GMT" CRLF) - 1;
284: }
285:
286: if (r->headers_out.content_type.len) {
287: len += sizeof("Content-Type: ") - 1
288: + r->headers_out.content_type.len + 2;
289:
290: if (r->headers_out.content_type_len == r->headers_out.content_type.len
291: && r->headers_out.charset.len)
292: {
293: len += sizeof("; charset=") - 1 + r->headers_out.charset.len;
294: }
295: }
296:
297: if (r->headers_out.content_length == NULL
298: && r->headers_out.content_length_n >= 0)
299: {
300: len += sizeof("Content-Length: ") - 1 + NGX_OFF_T_LEN + 2;
301: }
302:
303: if (r->headers_out.last_modified == NULL
304: && r->headers_out.last_modified_time != -1)
305: {
306: len += sizeof("Last-Modified: Mon, 28 Sep 1970 06:00:00 GMT" CRLF) - 1;
307: }
308:
309: c = r->connection;
310:
311: if (r->headers_out.location
312: && r->headers_out.location->value.len
313: && r->headers_out.location->value.data[0] == '/')
314: {
315: r->headers_out.location->hash = 0;
316:
317: if (clcf->server_name_in_redirect) {
318: cscf = ngx_http_get_module_srv_conf(r, ngx_http_core_module);
319: host = cscf->server_name;
320:
321: } else if (r->headers_in.server.len) {
322: host = r->headers_in.server;
323:
324: } else {
325: host.len = NGX_SOCKADDR_STRLEN;
326: host.data = addr;
327:
328: if (ngx_connection_local_sockaddr(c, &host, 0) != NGX_OK) {
329: return NGX_ERROR;
330: }
331: }
332:
333: switch (c->local_sockaddr->sa_family) {
334:
335: #if (NGX_HAVE_INET6)
336: case AF_INET6:
337: sin6 = (struct sockaddr_in6 *) c->local_sockaddr;
338: port = ntohs(sin6->sin6_port);
339: break;
340: #endif
341: #if (NGX_HAVE_UNIX_DOMAIN)
342: case AF_UNIX:
343: port = 0;
344: break;
345: #endif
346: default: /* AF_INET */
347: sin = (struct sockaddr_in *) c->local_sockaddr;
348: port = ntohs(sin->sin_port);
349: break;
350: }
351:
352: len += sizeof("Location: https://") - 1
353: + host.len
354: + r->headers_out.location->value.len + 2;
355:
356: if (clcf->port_in_redirect) {
357:
358: #if (NGX_HTTP_SSL)
359: if (c->ssl)
360: port = (port == 443) ? 0 : port;
361: else
362: #endif
363: port = (port == 80) ? 0 : port;
364:
365: } else {
366: port = 0;
367: }
368:
369: if (port) {
370: len += sizeof(":65535") - 1;
371: }
372:
373: } else {
374: ngx_str_null(&host);
375: port = 0;
376: }
377:
378: if (r->chunked) {
379: len += sizeof("Transfer-Encoding: chunked" CRLF) - 1;
380: }
381:
382: if (r->headers_out.status == NGX_HTTP_SWITCHING_PROTOCOLS) {
383: len += sizeof("Connection: upgrade" CRLF) - 1;
384:
385: } else if (r->keepalive) {
386: len += sizeof("Connection: keep-alive" CRLF) - 1;
387:
388: /*
389: * MSIE and Opera ignore the "Keep-Alive: timeout=<N>" header.
390: * MSIE keeps the connection alive for about 60-65 seconds.
391: * Opera keeps the connection alive very long.
392: * Mozilla keeps the connection alive for N plus about 1-10 seconds.
393: * Konqueror keeps the connection alive for about N seconds.
394: */
395:
396: if (clcf->keepalive_header) {
397: len += sizeof("Keep-Alive: timeout=") - 1 + NGX_TIME_T_LEN + 2;
398: }
399:
400: } else {
401: len += sizeof("Connection: close" CRLF) - 1;
402: }
403:
404: #if (NGX_HTTP_GZIP)
405: if (r->gzip_vary) {
406: if (clcf->gzip_vary) {
407: len += sizeof("Vary: Accept-Encoding" CRLF) - 1;
408:
409: } else {
410: r->gzip_vary = 0;
411: }
412: }
413: #endif
414:
415: part = &r->headers_out.headers.part;
416: header = part->elts;
417:
418: for (i = 0; /* void */; i++) {
419:
420: if (i >= part->nelts) {
421: if (part->next == NULL) {
422: break;
423: }
424:
425: part = part->next;
426: header = part->elts;
427: i = 0;
428: }
429:
430: if (header[i].hash == 0) {
431: continue;
432: }
433:
434: len += header[i].key.len + sizeof(": ") - 1 + header[i].value.len
435: + sizeof(CRLF) - 1;
436: }
437:
438: b = ngx_create_temp_buf(r->pool, len);
439: if (b == NULL) {
440: return NGX_ERROR;
441: }
442:
443: /* "HTTP/1.x " */
444: b->last = ngx_cpymem(b->last, "HTTP/1.1 ", sizeof("HTTP/1.x ") - 1);
445:
446: /* status line */
447: if (status_line) {
448: b->last = ngx_copy(b->last, status_line->data, status_line->len);
449:
450: } else {
451: b->last = ngx_sprintf(b->last, "%03ui", status);
452: }
453: *b->last++ = CR; *b->last++ = LF;
454:
455: if (r->headers_out.server == NULL) {
456: if (clcf->server_tokens) {
457: p = (u_char *) ngx_http_server_full_string;
458: len = sizeof(ngx_http_server_full_string) - 1;
459:
460: } else {
461: p = (u_char *) ngx_http_server_string;
462: len = sizeof(ngx_http_server_string) - 1;
463: }
464:
465: b->last = ngx_cpymem(b->last, p, len);
466: }
467:
468: if (r->headers_out.date == NULL) {
469: b->last = ngx_cpymem(b->last, "Date: ", sizeof("Date: ") - 1);
470: b->last = ngx_cpymem(b->last, ngx_cached_http_time.data,
471: ngx_cached_http_time.len);
472:
473: *b->last++ = CR; *b->last++ = LF;
474: }
475:
476: if (r->headers_out.content_type.len) {
477: b->last = ngx_cpymem(b->last, "Content-Type: ",
478: sizeof("Content-Type: ") - 1);
479: p = b->last;
480: b->last = ngx_copy(b->last, r->headers_out.content_type.data,
481: r->headers_out.content_type.len);
482:
483: if (r->headers_out.content_type_len == r->headers_out.content_type.len
484: && r->headers_out.charset.len)
485: {
486: b->last = ngx_cpymem(b->last, "; charset=",
487: sizeof("; charset=") - 1);
488: b->last = ngx_copy(b->last, r->headers_out.charset.data,
489: r->headers_out.charset.len);
490:
491: /* update r->headers_out.content_type for possible logging */
492:
493: r->headers_out.content_type.len = b->last - p;
494: r->headers_out.content_type.data = p;
495: }
496:
497: *b->last++ = CR; *b->last++ = LF;
498: }
499:
500: if (r->headers_out.content_length == NULL
501: && r->headers_out.content_length_n >= 0)
502: {
503: b->last = ngx_sprintf(b->last, "Content-Length: %O" CRLF,
504: r->headers_out.content_length_n);
505: }
506:
507: if (r->headers_out.last_modified == NULL
508: && r->headers_out.last_modified_time != -1)
509: {
510: b->last = ngx_cpymem(b->last, "Last-Modified: ",
511: sizeof("Last-Modified: ") - 1);
512: b->last = ngx_http_time(b->last, r->headers_out.last_modified_time);
513:
514: *b->last++ = CR; *b->last++ = LF;
515: }
516:
517: if (host.data) {
518:
519: p = b->last + sizeof("Location: ") - 1;
520:
521: b->last = ngx_cpymem(b->last, "Location: http",
522: sizeof("Location: http") - 1);
523:
524: #if (NGX_HTTP_SSL)
525: if (c->ssl) {
526: *b->last++ ='s';
527: }
528: #endif
529:
530: *b->last++ = ':'; *b->last++ = '/'; *b->last++ = '/';
531: b->last = ngx_copy(b->last, host.data, host.len);
532:
533: if (port) {
534: b->last = ngx_sprintf(b->last, ":%ui", port);
535: }
536:
537: b->last = ngx_copy(b->last, r->headers_out.location->value.data,
538: r->headers_out.location->value.len);
539:
540: /* update r->headers_out.location->value for possible logging */
541:
542: r->headers_out.location->value.len = b->last - p;
543: r->headers_out.location->value.data = p;
544: ngx_str_set(&r->headers_out.location->key, "Location");
545:
546: *b->last++ = CR; *b->last++ = LF;
547: }
548:
549: if (r->chunked) {
550: b->last = ngx_cpymem(b->last, "Transfer-Encoding: chunked" CRLF,
551: sizeof("Transfer-Encoding: chunked" CRLF) - 1);
552: }
553:
554: if (r->headers_out.status == NGX_HTTP_SWITCHING_PROTOCOLS) {
555: b->last = ngx_cpymem(b->last, "Connection: upgrade" CRLF,
556: sizeof("Connection: upgrade" CRLF) - 1);
557:
558: } else if (r->keepalive) {
559: b->last = ngx_cpymem(b->last, "Connection: keep-alive" CRLF,
560: sizeof("Connection: keep-alive" CRLF) - 1);
561:
562: if (clcf->keepalive_header) {
563: b->last = ngx_sprintf(b->last, "Keep-Alive: timeout=%T" CRLF,
564: clcf->keepalive_header);
565: }
566:
567: } else {
568: b->last = ngx_cpymem(b->last, "Connection: close" CRLF,
569: sizeof("Connection: close" CRLF) - 1);
570: }
571:
572: #if (NGX_HTTP_GZIP)
573: if (r->gzip_vary) {
574: b->last = ngx_cpymem(b->last, "Vary: Accept-Encoding" CRLF,
575: sizeof("Vary: Accept-Encoding" CRLF) - 1);
576: }
577: #endif
578:
579: part = &r->headers_out.headers.part;
580: header = part->elts;
581:
582: for (i = 0; /* void */; i++) {
583:
584: if (i >= part->nelts) {
585: if (part->next == NULL) {
586: break;
587: }
588:
589: part = part->next;
590: header = part->elts;
591: i = 0;
592: }
593:
594: if (header[i].hash == 0) {
595: continue;
596: }
597:
598: b->last = ngx_copy(b->last, header[i].key.data, header[i].key.len);
599: *b->last++ = ':'; *b->last++ = ' ';
600:
601: b->last = ngx_copy(b->last, header[i].value.data, header[i].value.len);
602: *b->last++ = CR; *b->last++ = LF;
603: }
604:
605: ngx_log_debug2(NGX_LOG_DEBUG_HTTP, c->log, 0,
606: "%*s", (size_t) (b->last - b->pos), b->pos);
607:
608: /* the end of HTTP header */
609: *b->last++ = CR; *b->last++ = LF;
610:
611: r->header_size = b->last - b->pos;
612:
613: if (r->header_only) {
614: b->last_buf = 1;
615: }
616:
617: out.buf = b;
618: out.next = NULL;
619:
620: return ngx_http_write_filter(r, &out);
621: }
622:
623:
624: static ngx_int_t
625: ngx_http_header_filter_init(ngx_conf_t *cf)
626: {
627: ngx_http_top_header_filter = ngx_http_header_filter;
628:
629: return NGX_OK;
630: }
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