diff options
Diffstat (limited to 'app/nginx/src/http/ngx_http_header_filter_module.c')
| -rw-r--r-- | app/nginx/src/http/ngx_http_header_filter_module.c | 629 |
1 files changed, 629 insertions, 0 deletions
diff --git a/app/nginx/src/http/ngx_http_header_filter_module.c b/app/nginx/src/http/ngx_http_header_filter_module.c new file mode 100644 index 0000000..c09c519 --- /dev/null +++ b/app/nginx/src/http/ngx_http_header_filter_module.c @@ -0,0 +1,629 @@ + +/* + * 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" 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"), + +#define NGX_HTTP_LAST_3XX 308 +#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_null_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) + 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) + 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; +} |