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