| |
| /* |
| * Copyright (C) Igor Sysoev |
| */ |
| |
| |
| #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_cycle_t *cycle); |
| 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, /* pre conf */ |
| |
| 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, |
| &ngx_http_header_filter_module_ctx, /* module context */ |
| NULL, /* module directives */ |
| NGX_HTTP_MODULE, /* module type */ |
| ngx_http_header_filter_init, /* init module */ |
| NULL /* init child */ |
| }; |
| |
| |
| static char server_string[] = "Server: " NGINX_VER CRLF; |
| |
| |
| static ngx_str_t http_codes[] = { |
| |
| ngx_string("200 OK"), |
| ngx_null_string, /* "201 Created" */ |
| ngx_null_string, /* "202 Accepted" */ |
| ngx_null_string, /* "203 Non-Authoritative Information" */ |
| ngx_null_string, /* "204 No Content" */ |
| ngx_null_string, /* "205 Reset Content" */ |
| ngx_string("206 Partial Content"), |
| ngx_null_string, /* "207 Multi-Status" */ |
| |
| #if 0 |
| ngx_null_string, /* "300 Multiple Choices" */ |
| #endif |
| |
| ngx_string("301 Moved Permanently"), |
| #if 0 |
| ngx_string("302 Moved Temporarily"), |
| #else |
| ngx_string("302 Found"), |
| #endif |
| ngx_null_string, /* "303 See Other" */ |
| ngx_string("304 Not Modified"), |
| |
| ngx_string("400 Bad Request"), |
| ngx_string("401 Unauthorized"), |
| ngx_null_string, /* "402 Payment Required" */ |
| ngx_string("403 Forbidden"), |
| ngx_string("404 Not Found"), |
| ngx_string("405 Not Allowed"), |
| ngx_null_string, /* "406 Not Acceptable" */ |
| ngx_null_string, /* "407 Proxy Authentication Required" */ |
| ngx_string("408 Request Time-out"), |
| ngx_null_string, /* "409 Conflict" */ |
| ngx_null_string, /* "410 Gone" */ |
| ngx_string("411 Length Required"), |
| ngx_null_string, /* "412 Precondition Failed" */ |
| ngx_string("413 Request Entity Too Large"), |
| ngx_null_string, /* "414 Request-URI Too Large" but we never send it |
| * because we treat such requests as the HTTP/0.9 |
| * requests and send only a body without a header |
| */ |
| ngx_null_string, /* "415 Unsupported Media Type" */ |
| ngx_string("416 Requested Range Not Satisfiable"), |
| |
| ngx_string("500 Internal Server Error"), |
| ngx_string("501 Method Not Implemented"), |
| ngx_string("502 Bad Gateway"), |
| ngx_string("503 Service Temporarily Unavailable"), |
| ngx_string("504 Gateway Time-out") |
| }; |
| |
| |
| ngx_http_header_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-Type"), |
| offsetof(ngx_http_headers_out_t, content_type) }, |
| { 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_uint_t status, i; |
| ngx_buf_t *b; |
| ngx_chain_t *ln; |
| ngx_list_part_t *part; |
| ngx_table_elt_t *header; |
| ngx_http_core_loc_conf_t *clcf; |
| |
| 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_NOT_MODIFIED |
| && r->headers_out.status != NGX_HTTP_PARTIAL_CONTENT) |
| { |
| r->headers_out.last_modified_time = -1; |
| r->headers_out.last_modified = NULL; |
| } |
| } |
| |
| /* 2 is for trailing "\r\n" and 2 is for "\r\n" in the end of header */ |
| len = sizeof("HTTP/1.x ") - 1 + 2 + 2; |
| |
| /* status line */ |
| |
| if (r->headers_out.status_line.len) { |
| len += r->headers_out.status_line.len; |
| #if (NGX_SUPPRESS_WARN) |
| status = NGX_INVALID_ARRAY_INDEX; |
| #endif |
| |
| } else { |
| |
| if (r->headers_out.status < NGX_HTTP_MOVED_PERMANENTLY) { |
| /* 2XX */ |
| status = r->headers_out.status - NGX_HTTP_OK; |
| |
| } else if (r->headers_out.status < NGX_HTTP_BAD_REQUEST) { |
| /* 3XX */ |
| status = r->headers_out.status - NGX_HTTP_MOVED_PERMANENTLY + 8; |
| |
| if (r->headers_out.status == NGX_HTTP_NOT_MODIFIED) { |
| r->header_only = 1; |
| } |
| |
| } else if (r->headers_out.status < NGX_HTTP_INTERNAL_SERVER_ERROR) { |
| /* 4XX */ |
| status = r->headers_out.status - NGX_HTTP_BAD_REQUEST + 8 + 4; |
| |
| } else { |
| /* 5XX */ |
| status = r->headers_out.status |
| - NGX_HTTP_INTERNAL_SERVER_ERROR + 8 + 4 + 17; |
| } |
| |
| len += http_codes[status].len; |
| } |
| |
| if (r->headers_out.server && r->headers_out.server->key.len) { |
| len += r->headers_out.server->key.len |
| + r->headers_out.server->value.len + 2; |
| } else { |
| len += sizeof(server_string) - 1; |
| } |
| |
| if (r->headers_out.date && r->headers_out.date->key.len) { |
| len += r->headers_out.date->key.len |
| + r->headers_out.date->value.len + 2; |
| } else { |
| len += sizeof("Date: Mon, 28 Sep 1970 06:00:00 GMT" CRLF) - 1; |
| } |
| |
| if (r->headers_out.content_length == NULL) { |
| if (r->headers_out.content_length_n >= 0) { |
| len += sizeof("Content-Length: ") - 1 + NGX_OFF_T_LEN + 2; |
| } |
| } |
| |
| if (r->headers_out.content_type && r->headers_out.content_type->value.len) { |
| r->headers_out.content_type->key.len = 0; |
| len += sizeof("Content-Type: ") - 1 |
| + r->headers_out.content_type->value.len + 2; |
| |
| if (r->headers_out.charset.len) { |
| len += sizeof("; charset=") - 1 + r->headers_out.charset.len; |
| } |
| } |
| |
| if (r->headers_out.location |
| && r->headers_out.location->value.len |
| && r->headers_out.location->value.data[0] == '/') |
| { |
| r->headers_out.location->key.len = 0; |
| len += sizeof("Location: http://") - 1 |
| + r->server_name.len + r->headers_out.location->value.len + 2; |
| |
| if (r->port != 80) { |
| len += r->port_text->len; |
| } |
| } |
| |
| if (r->headers_out.last_modified && r->headers_out.last_modified->key.len) { |
| len += r->headers_out.last_modified->key.len |
| + r->headers_out.last_modified->value.len + 2; |
| |
| } else if (r->headers_out.last_modified_time != -1) { |
| len += sizeof("Last-Modified: Mon, 28 Sep 1970 06:00:00 GMT" CRLF) - 1; |
| } |
| |
| if (r->chunked) { |
| len += sizeof("Transfer-Encoding: chunked" CRLF) - 1; |
| } |
| |
| clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module); |
| |
| 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 |
| && (r->headers_in.gecko || r->headers_in.konqueror)) |
| { |
| len += sizeof("Keep-Alive: timeout=") - 1 + TIME_T_LEN + 2; |
| } |
| |
| } else { |
| len += sizeof("Connection: closed" CRLF) - 1; |
| } |
| |
| 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].key.len == 0) { |
| continue; |
| } |
| |
| /* 2 is for ": " and 2 is for "\r\n" */ |
| len += header[i].key.len + 2 + header[i].value.len + 2; |
| } |
| |
| if (!(b = ngx_create_temp_buf(r->pool, len))) { |
| return NGX_ERROR; |
| } |
| |
| /* "HTTP/1.x " */ |
| b->last = ngx_cpymem(b->last, "HTTP/1.1 ", sizeof("HTTP/1.x ") - 1); |
| |
| /* status line */ |
| if (r->headers_out.status_line.len) { |
| b->last = ngx_cpymem(b->last, r->headers_out.status_line.data, |
| r->headers_out.status_line.len); |
| |
| } else { |
| b->last = ngx_cpymem(b->last, http_codes[status].data, |
| http_codes[status].len); |
| } |
| *(b->last++) = CR; *(b->last++) = LF; |
| |
| if (!(r->headers_out.server && r->headers_out.server->key.len)) { |
| b->last = ngx_cpymem(b->last, server_string, sizeof(server_string) - 1); |
| } |
| |
| if (!(r->headers_out.date && r->headers_out.date->key.len)) { |
| 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_length == NULL) { |
| if (r->headers_out.content_length_n >= 0) { |
| b->last = ngx_sprintf(b->last, "Content-Length: %O" CRLF, |
| r->headers_out.content_length_n); |
| |
| #if 0 |
| b->last += ngx_snprintf((char *) b->last, |
| sizeof("Content-Length: ") + NGX_OFF_T_LEN + 2, |
| "Content-Length: " OFF_T_FMT CRLF, |
| r->headers_out.content_length_n); |
| #endif |
| } |
| } |
| |
| if (r->headers_out.content_type && r->headers_out.content_type->value.len) { |
| b->last = ngx_cpymem(b->last, "Content-Type: ", |
| sizeof("Content-Type: ") - 1); |
| p = b->last; |
| b->last = ngx_cpymem(b->last, r->headers_out.content_type->value.data, |
| r->headers_out.content_type->value.len); |
| |
| if (r->headers_out.charset.len) { |
| b->last = ngx_cpymem(b->last, "; charset=", |
| sizeof("; charset=") - 1); |
| b->last = ngx_cpymem(b->last, r->headers_out.charset.data, |
| r->headers_out.charset.len); |
| |
| r->headers_out.content_type->value.len = b->last - p; |
| r->headers_out.content_type->value.data = p; |
| } |
| |
| *(b->last++) = CR; *(b->last++) = LF; |
| } |
| |
| if (r->headers_out.location |
| && r->headers_out.location->value.len |
| && r->headers_out.location->value.data[0] == '/') |
| { |
| p = b->last + sizeof("Location: ") - 1; |
| b->last = ngx_cpymem(b->last, "Location: http://", |
| sizeof("Location: http://") - 1); |
| b->last = ngx_cpymem(b->last, r->server_name.data, |
| r->server_name.len); |
| if (r->port != 80) { |
| b->last = ngx_cpymem(b->last, r->port_text->data, |
| r->port_text->len); |
| } |
| |
| b->last = ngx_cpymem(b->last, r->headers_out.location->value.data, |
| r->headers_out.location->value.len); |
| |
| r->headers_out.location->value.len = b->last - p; |
| r->headers_out.location->value.data = p; |
| |
| *(b->last++) = CR; *(b->last++) = LF; |
| } |
| |
| if (!(r->headers_out.last_modified && r->headers_out.last_modified->key.len) |
| && 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 (r->chunked) { |
| b->last = ngx_cpymem(b->last, "Transfer-Encoding: chunked" CRLF, |
| sizeof("Transfer-Encoding: chunked" CRLF) - 1); |
| } |
| |
| if (r->keepalive) { |
| b->last = ngx_cpymem(b->last, "Connection: keep-alive" CRLF, |
| sizeof("Connection: keep-alive" CRLF) - 1); |
| |
| if (clcf->keepalive_header |
| && (r->headers_in.gecko || r->headers_in.konqueror)) |
| { |
| b->last = ngx_sprintf(b->last, "Keep-Alive: timeout=%T" CRLF, |
| clcf->keepalive_header); |
| #if 0 |
| b->last += ngx_snprintf((char *) b->last, |
| sizeof("Keep-Alive: timeout=") + TIME_T_LEN + 2, |
| "Keep-Alive: timeout=" TIME_T_FMT CRLF, |
| clcf->keepalive_header); |
| #endif |
| } |
| |
| } else { |
| b->last = ngx_cpymem(b->last, "Connection: close" CRLF, |
| sizeof("Connection: close" CRLF) - 1); |
| } |
| |
| 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].key.len == 0) { |
| continue; |
| } |
| |
| b->last = ngx_cpymem(b->last, header[i].key.data, header[i].key.len); |
| *(b->last++) = ':' ; *(b->last++) = ' ' ; |
| |
| b->last = ngx_cpymem(b->last, header[i].value.data, |
| header[i].value.len); |
| *(b->last++) = CR; *(b->last++) = LF; |
| } |
| |
| #if (NGX_DEBUG) |
| *(b->last) = '\0'; |
| ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "%s\n", b->pos); |
| #endif |
| |
| /* 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; |
| } |
| |
| if (!(ln = ngx_alloc_chain_link(r->pool))) { |
| return NGX_ERROR; |
| } |
| |
| ln->buf = b; |
| ln->next = NULL; |
| |
| return ngx_http_write_filter(r, ln); |
| } |
| |
| |
| static ngx_int_t ngx_http_header_filter_init(ngx_cycle_t *cycle) |
| { |
| ngx_http_top_header_filter = ngx_http_header_filter; |
| |
| return NGX_OK; |
| } |
