635 lines
19 KiB
C
635 lines
19 KiB
C
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/*
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* Copyright (C) Igor Sysoev
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* Copyright (C) Nginx, Inc.
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*/
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#include <ngx_config.h>
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#include <ngx_core.h>
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#include <ngx_http.h>
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#include <nginx.h>
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static ngx_int_t ngx_http_header_filter_init(ngx_conf_t *cf);
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static ngx_int_t ngx_http_header_filter(ngx_http_request_t *r);
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static ngx_http_module_t ngx_http_header_filter_module_ctx = {
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NULL, /* preconfiguration */
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ngx_http_header_filter_init, /* postconfiguration */
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NULL, /* create main configuration */
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NULL, /* init main configuration */
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NULL, /* create server configuration */
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NULL, /* merge server configuration */
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NULL, /* create location configuration */
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NULL, /* merge location configuration */
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};
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ngx_module_t ngx_http_header_filter_module = {
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NGX_MODULE_V1,
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&ngx_http_header_filter_module_ctx, /* module context */
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NULL, /* module directives */
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NGX_HTTP_MODULE, /* module type */
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NULL, /* init master */
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NULL, /* init module */
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NULL, /* init process */
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NULL, /* init thread */
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NULL, /* exit thread */
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NULL, /* exit process */
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NULL, /* exit master */
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NGX_MODULE_V1_PADDING
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};
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static u_char ngx_http_server_string[] = "Server: nginx" CRLF;
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static u_char ngx_http_server_full_string[] = "Server: " NGINX_VER CRLF;
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static u_char ngx_http_server_build_string[] = "Server: " NGINX_VER_BUILD CRLF;
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static ngx_str_t ngx_http_status_lines[] = {
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ngx_string("200 OK"),
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ngx_string("201 Created"),
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ngx_string("202 Accepted"),
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ngx_null_string, /* "203 Non-Authoritative Information" */
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ngx_string("204 No Content"),
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ngx_null_string, /* "205 Reset Content" */
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ngx_string("206 Partial Content"),
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/* ngx_null_string, */ /* "207 Multi-Status" */
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#define NGX_HTTP_LAST_2XX 207
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#define NGX_HTTP_OFF_3XX (NGX_HTTP_LAST_2XX - 200)
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/* ngx_null_string, */ /* "300 Multiple Choices" */
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ngx_string("301 Moved Permanently"),
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ngx_string("302 Moved Temporarily"),
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ngx_string("303 See Other"),
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ngx_string("304 Not Modified"),
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ngx_null_string, /* "305 Use Proxy" */
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ngx_null_string, /* "306 unused" */
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ngx_string("307 Temporary Redirect"),
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ngx_string("308 Permanent Redirect"),
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#define NGX_HTTP_LAST_3XX 309
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#define NGX_HTTP_OFF_4XX (NGX_HTTP_LAST_3XX - 301 + NGX_HTTP_OFF_3XX)
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ngx_string("400 Bad Request"),
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ngx_string("401 Unauthorized"),
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ngx_string("402 Payment Required"),
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ngx_string("403 Forbidden"),
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ngx_string("404 Not Found"),
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ngx_string("405 Not Allowed"),
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ngx_string("406 Not Acceptable"),
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ngx_null_string, /* "407 Proxy Authentication Required" */
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ngx_string("408 Request Time-out"),
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ngx_string("409 Conflict"),
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ngx_string("410 Gone"),
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ngx_string("411 Length Required"),
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ngx_string("412 Precondition Failed"),
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ngx_string("413 Request Entity Too Large"),
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ngx_string("414 Request-URI Too Large"),
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ngx_string("415 Unsupported Media Type"),
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ngx_string("416 Requested Range Not Satisfiable"),
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ngx_null_string, /* "417 Expectation Failed" */
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ngx_null_string, /* "418 unused" */
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ngx_null_string, /* "419 unused" */
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ngx_null_string, /* "420 unused" */
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ngx_string("421 Misdirected Request"),
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ngx_null_string, /* "422 Unprocessable Entity" */
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ngx_null_string, /* "423 Locked" */
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ngx_null_string, /* "424 Failed Dependency" */
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ngx_null_string, /* "425 unused" */
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ngx_null_string, /* "426 Upgrade Required" */
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ngx_null_string, /* "427 unused" */
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ngx_null_string, /* "428 Precondition Required" */
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ngx_string("429 Too Many Requests"),
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#define NGX_HTTP_LAST_4XX 430
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#define NGX_HTTP_OFF_5XX (NGX_HTTP_LAST_4XX - 400 + NGX_HTTP_OFF_4XX)
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ngx_string("500 Internal Server Error"),
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ngx_string("501 Not Implemented"),
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ngx_string("502 Bad Gateway"),
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ngx_string("503 Service Temporarily Unavailable"),
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ngx_string("504 Gateway Time-out"),
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ngx_string("505 HTTP Version Not Supported"),
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ngx_null_string, /* "506 Variant Also Negotiates" */
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ngx_string("507 Insufficient Storage"),
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/* ngx_null_string, */ /* "508 unused" */
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/* ngx_null_string, */ /* "509 unused" */
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/* ngx_null_string, */ /* "510 Not Extended" */
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#define NGX_HTTP_LAST_5XX 508
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};
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ngx_http_header_out_t ngx_http_headers_out[] = {
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{ ngx_string("Server"), offsetof(ngx_http_headers_out_t, server) },
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{ ngx_string("Date"), offsetof(ngx_http_headers_out_t, date) },
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{ ngx_string("Content-Length"),
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offsetof(ngx_http_headers_out_t, content_length) },
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{ ngx_string("Content-Encoding"),
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offsetof(ngx_http_headers_out_t, content_encoding) },
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{ ngx_string("Location"), offsetof(ngx_http_headers_out_t, location) },
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{ ngx_string("Last-Modified"),
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offsetof(ngx_http_headers_out_t, last_modified) },
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{ ngx_string("Accept-Ranges"),
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offsetof(ngx_http_headers_out_t, accept_ranges) },
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{ ngx_string("Expires"), offsetof(ngx_http_headers_out_t, expires) },
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{ ngx_string("Cache-Control"),
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offsetof(ngx_http_headers_out_t, cache_control) },
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{ ngx_string("ETag"), offsetof(ngx_http_headers_out_t, etag) },
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{ ngx_null_string, 0 }
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};
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static ngx_int_t
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ngx_http_header_filter(ngx_http_request_t *r)
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{
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u_char *p;
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size_t len;
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ngx_str_t host, *status_line;
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ngx_buf_t *b;
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ngx_uint_t status, i, port;
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ngx_chain_t out;
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ngx_list_part_t *part;
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ngx_table_elt_t *header;
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ngx_connection_t *c;
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ngx_http_core_loc_conf_t *clcf;
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ngx_http_core_srv_conf_t *cscf;
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u_char addr[NGX_SOCKADDR_STRLEN];
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if (r->header_sent) {
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return NGX_OK;
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}
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r->header_sent = 1;
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if (r != r->main) {
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return NGX_OK;
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}
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if (r->http_version < NGX_HTTP_VERSION_10) {
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return NGX_OK;
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}
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if (r->method == NGX_HTTP_HEAD) {
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r->header_only = 1;
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}
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if (r->headers_out.last_modified_time != -1) {
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if (r->headers_out.status != NGX_HTTP_OK
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&& r->headers_out.status != NGX_HTTP_PARTIAL_CONTENT
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&& r->headers_out.status != NGX_HTTP_NOT_MODIFIED)
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{
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r->headers_out.last_modified_time = -1;
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r->headers_out.last_modified = NULL;
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}
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}
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if (r->keepalive && (ngx_terminate || ngx_exiting)) {
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r->keepalive = 0;
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}
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len = sizeof("HTTP/1.x ") - 1 + sizeof(CRLF) - 1
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/* the end of the header */
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+ sizeof(CRLF) - 1;
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/* status line */
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if (r->headers_out.status_line.len) {
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len += r->headers_out.status_line.len;
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status_line = &r->headers_out.status_line;
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#if (NGX_SUPPRESS_WARN)
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status = 0;
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#endif
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} else {
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status = r->headers_out.status;
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if (status >= NGX_HTTP_OK
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&& status < NGX_HTTP_LAST_2XX)
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{
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/* 2XX */
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if (status == NGX_HTTP_NO_CONTENT) {
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r->header_only = 1;
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ngx_str_null(&r->headers_out.content_type);
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r->headers_out.last_modified_time = -1;
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r->headers_out.last_modified = NULL;
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r->headers_out.content_length = NULL;
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r->headers_out.content_length_n = -1;
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}
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status -= NGX_HTTP_OK;
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status_line = &ngx_http_status_lines[status];
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len += ngx_http_status_lines[status].len;
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} else if (status >= NGX_HTTP_MOVED_PERMANENTLY
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&& status < NGX_HTTP_LAST_3XX)
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{
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/* 3XX */
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if (status == NGX_HTTP_NOT_MODIFIED) {
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r->header_only = 1;
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}
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status = status - NGX_HTTP_MOVED_PERMANENTLY + NGX_HTTP_OFF_3XX;
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status_line = &ngx_http_status_lines[status];
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len += ngx_http_status_lines[status].len;
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} else if (status >= NGX_HTTP_BAD_REQUEST
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&& status < NGX_HTTP_LAST_4XX)
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{
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/* 4XX */
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status = status - NGX_HTTP_BAD_REQUEST
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+ NGX_HTTP_OFF_4XX;
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status_line = &ngx_http_status_lines[status];
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len += ngx_http_status_lines[status].len;
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} else if (status >= NGX_HTTP_INTERNAL_SERVER_ERROR
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&& status < NGX_HTTP_LAST_5XX)
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{
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/* 5XX */
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status = status - NGX_HTTP_INTERNAL_SERVER_ERROR
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+ NGX_HTTP_OFF_5XX;
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status_line = &ngx_http_status_lines[status];
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len += ngx_http_status_lines[status].len;
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} else {
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len += NGX_INT_T_LEN + 1 /* SP */;
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status_line = NULL;
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}
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if (status_line && status_line->len == 0) {
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status = r->headers_out.status;
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len += NGX_INT_T_LEN + 1 /* SP */;
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status_line = NULL;
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}
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}
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clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
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if (r->headers_out.server == NULL) {
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if (clcf->server_tokens == NGX_HTTP_SERVER_TOKENS_ON) {
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len += sizeof(ngx_http_server_full_string) - 1;
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} else if (clcf->server_tokens == NGX_HTTP_SERVER_TOKENS_BUILD) {
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len += sizeof(ngx_http_server_build_string) - 1;
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} else {
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len += sizeof(ngx_http_server_string) - 1;
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}
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}
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if (r->headers_out.date == NULL) {
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len += sizeof("Date: Mon, 28 Sep 1970 06:00:00 GMT" CRLF) - 1;
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}
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if (r->headers_out.content_type.len) {
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len += sizeof("Content-Type: ") - 1
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+ r->headers_out.content_type.len + 2;
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if (r->headers_out.content_type_len == r->headers_out.content_type.len
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&& r->headers_out.charset.len)
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{
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len += sizeof("; charset=") - 1 + r->headers_out.charset.len;
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}
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}
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if (r->headers_out.content_length == NULL
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&& r->headers_out.content_length_n >= 0)
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{
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len += sizeof("Content-Length: ") - 1 + NGX_OFF_T_LEN + 2;
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}
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if (r->headers_out.last_modified == NULL
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&& r->headers_out.last_modified_time != -1)
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{
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len += sizeof("Last-Modified: Mon, 28 Sep 1970 06:00:00 GMT" CRLF) - 1;
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}
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c = r->connection;
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if (r->headers_out.location
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&& r->headers_out.location->value.len
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&& r->headers_out.location->value.data[0] == '/'
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&& clcf->absolute_redirect)
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{
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r->headers_out.location->hash = 0;
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if (clcf->server_name_in_redirect) {
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cscf = ngx_http_get_module_srv_conf(r, ngx_http_core_module);
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host = cscf->server_name;
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} else if (r->headers_in.server.len) {
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host = r->headers_in.server;
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} else {
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host.len = NGX_SOCKADDR_STRLEN;
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host.data = addr;
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if (ngx_connection_local_sockaddr(c, &host, 0) != NGX_OK) {
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return NGX_ERROR;
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}
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}
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port = ngx_inet_get_port(c->local_sockaddr);
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len += sizeof("Location: https://") - 1
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+ host.len
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+ r->headers_out.location->value.len + 2;
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if (clcf->port_in_redirect) {
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#if (NGX_HTTP_SSL)
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if (c->ssl)
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port = (port == 443) ? 0 : port;
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else
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#endif
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port = (port == 80) ? 0 : port;
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} else {
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port = 0;
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}
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if (port) {
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len += sizeof(":65535") - 1;
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}
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} else {
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ngx_str_null(&host);
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port = 0;
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}
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if (r->chunked) {
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len += sizeof("Transfer-Encoding: chunked" CRLF) - 1;
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}
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if (r->headers_out.status == NGX_HTTP_SWITCHING_PROTOCOLS) {
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len += sizeof("Connection: upgrade" CRLF) - 1;
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} else if (r->keepalive) {
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len += sizeof("Connection: keep-alive" CRLF) - 1;
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/*
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* MSIE and Opera ignore the "Keep-Alive: timeout=<N>" header.
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* MSIE keeps the connection alive for about 60-65 seconds.
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* Opera keeps the connection alive very long.
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* Mozilla keeps the connection alive for N plus about 1-10 seconds.
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* Konqueror keeps the connection alive for about N seconds.
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*/
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if (clcf->keepalive_header) {
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len += sizeof("Keep-Alive: timeout=") - 1 + NGX_TIME_T_LEN + 2;
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}
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} else {
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len += sizeof("Connection: close" CRLF) - 1;
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}
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#if (NGX_HTTP_GZIP)
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if (r->gzip_vary) {
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if (clcf->gzip_vary) {
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len += sizeof("Vary: Accept-Encoding" CRLF) - 1;
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} else {
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r->gzip_vary = 0;
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}
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}
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#endif
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part = &r->headers_out.headers.part;
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header = part->elts;
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for (i = 0; /* void */; i++) {
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if (i >= part->nelts) {
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if (part->next == NULL) {
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break;
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}
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part = part->next;
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header = part->elts;
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i = 0;
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}
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if (header[i].hash == 0) {
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continue;
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}
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len += header[i].key.len + sizeof(": ") - 1 + header[i].value.len
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+ sizeof(CRLF) - 1;
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}
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b = ngx_create_temp_buf(r->pool, len);
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if (b == NULL) {
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return NGX_ERROR;
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}
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/* "HTTP/1.x " */
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b->last = ngx_cpymem(b->last, "HTTP/1.1 ", sizeof("HTTP/1.x ") - 1);
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/* status line */
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if (status_line) {
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b->last = ngx_copy(b->last, status_line->data, status_line->len);
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} else {
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b->last = ngx_sprintf(b->last, "%03ui ", status);
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}
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*b->last++ = CR; *b->last++ = LF;
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if (r->headers_out.server == NULL) {
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if (clcf->server_tokens == NGX_HTTP_SERVER_TOKENS_ON) {
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p = ngx_http_server_full_string;
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len = sizeof(ngx_http_server_full_string) - 1;
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} else if (clcf->server_tokens == NGX_HTTP_SERVER_TOKENS_BUILD) {
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p = ngx_http_server_build_string;
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len = sizeof(ngx_http_server_build_string) - 1;
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} else {
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p = ngx_http_server_string;
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len = sizeof(ngx_http_server_string) - 1;
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}
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b->last = ngx_cpymem(b->last, p, len);
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}
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if (r->headers_out.date == NULL) {
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b->last = ngx_cpymem(b->last, "Date: ", sizeof("Date: ") - 1);
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b->last = ngx_cpymem(b->last, ngx_cached_http_time.data,
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ngx_cached_http_time.len);
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*b->last++ = CR; *b->last++ = LF;
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}
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if (r->headers_out.content_type.len) {
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b->last = ngx_cpymem(b->last, "Content-Type: ",
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sizeof("Content-Type: ") - 1);
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p = b->last;
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b->last = ngx_copy(b->last, r->headers_out.content_type.data,
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r->headers_out.content_type.len);
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if (r->headers_out.content_type_len == r->headers_out.content_type.len
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&& r->headers_out.charset.len)
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{
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b->last = ngx_cpymem(b->last, "; charset=",
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sizeof("; charset=") - 1);
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b->last = ngx_copy(b->last, r->headers_out.charset.data,
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r->headers_out.charset.len);
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/* update r->headers_out.content_type for possible logging */
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r->headers_out.content_type.len = b->last - p;
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r->headers_out.content_type.data = p;
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}
|
|
|
|
*b->last++ = CR; *b->last++ = LF;
|
|
}
|
|
|
|
if (r->headers_out.content_length == NULL
|
|
&& r->headers_out.content_length_n >= 0)
|
|
{
|
|
b->last = ngx_sprintf(b->last, "Content-Length: %O" CRLF,
|
|
r->headers_out.content_length_n);
|
|
}
|
|
|
|
if (r->headers_out.last_modified == NULL
|
|
&& r->headers_out.last_modified_time != -1)
|
|
{
|
|
b->last = ngx_cpymem(b->last, "Last-Modified: ",
|
|
sizeof("Last-Modified: ") - 1);
|
|
b->last = ngx_http_time(b->last, r->headers_out.last_modified_time);
|
|
|
|
*b->last++ = CR; *b->last++ = LF;
|
|
}
|
|
|
|
if (host.data) {
|
|
|
|
p = b->last + sizeof("Location: ") - 1;
|
|
|
|
b->last = ngx_cpymem(b->last, "Location: http",
|
|
sizeof("Location: http") - 1);
|
|
|
|
#if (NGX_HTTP_SSL)
|
|
if (c->ssl) {
|
|
*b->last++ ='s';
|
|
}
|
|
#endif
|
|
|
|
*b->last++ = ':'; *b->last++ = '/'; *b->last++ = '/';
|
|
b->last = ngx_copy(b->last, host.data, host.len);
|
|
|
|
if (port) {
|
|
b->last = ngx_sprintf(b->last, ":%ui", port);
|
|
}
|
|
|
|
b->last = ngx_copy(b->last, r->headers_out.location->value.data,
|
|
r->headers_out.location->value.len);
|
|
|
|
/* update r->headers_out.location->value for possible logging */
|
|
|
|
r->headers_out.location->value.len = b->last - p;
|
|
r->headers_out.location->value.data = p;
|
|
ngx_str_set(&r->headers_out.location->key, "Location");
|
|
|
|
*b->last++ = CR; *b->last++ = LF;
|
|
}
|
|
|
|
if (r->chunked) {
|
|
b->last = ngx_cpymem(b->last, "Transfer-Encoding: chunked" CRLF,
|
|
sizeof("Transfer-Encoding: chunked" CRLF) - 1);
|
|
}
|
|
|
|
if (r->headers_out.status == NGX_HTTP_SWITCHING_PROTOCOLS) {
|
|
b->last = ngx_cpymem(b->last, "Connection: upgrade" CRLF,
|
|
sizeof("Connection: upgrade" CRLF) - 1);
|
|
|
|
} else if (r->keepalive) {
|
|
b->last = ngx_cpymem(b->last, "Connection: keep-alive" CRLF,
|
|
sizeof("Connection: keep-alive" CRLF) - 1);
|
|
|
|
if (clcf->keepalive_header) {
|
|
b->last = ngx_sprintf(b->last, "Keep-Alive: timeout=%T" CRLF,
|
|
clcf->keepalive_header);
|
|
}
|
|
|
|
} else {
|
|
b->last = ngx_cpymem(b->last, "Connection: close" CRLF,
|
|
sizeof("Connection: close" CRLF) - 1);
|
|
}
|
|
|
|
#if (NGX_HTTP_GZIP)
|
|
if (r->gzip_vary) {
|
|
b->last = ngx_cpymem(b->last, "Vary: Accept-Encoding" CRLF,
|
|
sizeof("Vary: Accept-Encoding" CRLF) - 1);
|
|
}
|
|
#endif
|
|
|
|
part = &r->headers_out.headers.part;
|
|
header = part->elts;
|
|
|
|
for (i = 0; /* void */; i++) {
|
|
|
|
if (i >= part->nelts) {
|
|
if (part->next == NULL) {
|
|
break;
|
|
}
|
|
|
|
part = part->next;
|
|
header = part->elts;
|
|
i = 0;
|
|
}
|
|
|
|
if (header[i].hash == 0) {
|
|
continue;
|
|
}
|
|
|
|
b->last = ngx_copy(b->last, header[i].key.data, header[i].key.len);
|
|
*b->last++ = ':'; *b->last++ = ' ';
|
|
|
|
b->last = ngx_copy(b->last, header[i].value.data, header[i].value.len);
|
|
*b->last++ = CR; *b->last++ = LF;
|
|
}
|
|
|
|
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, c->log, 0,
|
|
"%*s", (size_t) (b->last - b->pos), b->pos);
|
|
|
|
/* the end of HTTP header */
|
|
*b->last++ = CR; *b->last++ = LF;
|
|
|
|
r->header_size = b->last - b->pos;
|
|
|
|
if (r->header_only) {
|
|
b->last_buf = 1;
|
|
}
|
|
|
|
out.buf = b;
|
|
out.next = NULL;
|
|
|
|
return ngx_http_write_filter(r, &out);
|
|
}
|
|
|
|
|
|
static ngx_int_t
|
|
ngx_http_header_filter_init(ngx_conf_t *cf)
|
|
{
|
|
ngx_http_top_header_filter = ngx_http_header_filter;
|
|
|
|
return NGX_OK;
|
|
}
|