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handler_error.c
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handler_error.c
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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/* Cherokee
*
* Authors:
* Alvaro Lopez Ortega <alvaro@alobbs.com>
*
* Copyright (C) 2001-2011 Alvaro Lopez Ortega
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU General Public
* License as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
#include "common-internal.h"
#include "handler_error.h"
#include "server.h"
#include "server-protected.h"
#include "connection-protected.h"
#include "header-protected.h"
/* Plug-in initialization
*/
PLUGIN_INFO_HANDLER_EASIEST_INIT (error, http_all_methods);
ret_t
cherokee_handler_error_configure (cherokee_config_node_t *conf, cherokee_server_t *srv, cherokee_module_props_t **_props)
{
UNUSED(conf);
UNUSED(srv);
UNUSED(_props);
return ret_ok;
}
ret_t
cherokee_handler_error_new (cherokee_handler_t **hdl, cherokee_connection_t *cnt, cherokee_module_props_t *props)
{
ret_t ret;
CHEROKEE_NEW_STRUCT (n, handler_error);
/* Init the base class object
*/
cherokee_handler_init_base (HANDLER(n), cnt, HANDLER_PROPS(props), PLUGIN_INFO_HANDLER_PTR(error));
/* Supported features
*/
HANDLER(n)->support = hsupport_error;
MODULE(n)->init = (handler_func_init_t) cherokee_handler_error_init;
MODULE(n)->free = (module_func_free_t) cherokee_handler_error_free;
HANDLER(n)->step = (handler_func_step_t) cherokee_handler_error_step;
HANDLER(n)->add_headers = (handler_func_add_headers_t) cherokee_handler_error_add_headers;
/* Init
*/
ret = cherokee_buffer_init (&n->content);
if (unlikely(ret < ret_ok))
return ret;
/* Return the object
*/
*hdl = HANDLER(n);
return ret_ok;
}
ret_t
cherokee_handler_error_free (cherokee_handler_error_t *hdl)
{
cherokee_buffer_mrproper (&hdl->content);
return ret_ok;
}
static ret_t
build_hardcoded_response_page (cherokee_connection_t *conn, cherokee_buffer_t *buffer)
{
/* Avoid too many reallocations.
*/
cherokee_buffer_ensure_addlen (buffer, 1000);
/* Add document header
*/
cherokee_buffer_add_str (buffer, "<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\">" CRLF);
/* Add page title
*/
cherokee_buffer_add_str (buffer, "<html>" CRLF "<head><title>");
cherokee_http_code_copy (conn->error_code, buffer);
/* Add big banner
*/
cherokee_buffer_add_str (buffer, "</title>" CRLF
"<meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\" />" CRLF
"</head>" CRLF "<body>" CRLF "<h1>");
cherokee_http_code_copy (conn->error_code, buffer);
cherokee_buffer_add_str (buffer, "</h1>" CRLF);
/* Maybe add some info
*/
switch (conn->error_code) {
case http_not_found:
case http_gone:
cherokee_buffer_add_str (buffer, "The requested URL ");
if (! cherokee_buffer_is_empty (&conn->request_original)) {
cherokee_buffer_add_escape_html (buffer, &conn->request_original);
}
else if (! cherokee_buffer_is_empty (&conn->request)) {
if (cherokee_connection_use_webdir (conn)) {
cherokee_buffer_add_buffer (buffer, &conn->web_directory);
}
cherokee_buffer_add_escape_html (buffer, &conn->request);
}
if (conn->error_code == http_not_found) {
cherokee_buffer_add_str (buffer, " was not found on this server.");
} else {
cherokee_buffer_add_str (buffer,
" is no longer available on this server and there is no forwarding address.");
}
break;
case http_bad_request:
cherokee_buffer_add_str (buffer,
"Your browser sent a request that this server could not understand.");
cherokee_buffer_add_str (buffer, "<p><pre>");
cherokee_buffer_add_escape_html (buffer, conn->header.input_buffer);
cherokee_buffer_add_str (buffer, "</pre>");
break;
case http_access_denied:
cherokee_buffer_add_str (buffer,
"You have no access to the requested URL");
break;
case http_request_entity_too_large:
cherokee_buffer_add_str (buffer,
"The length of request entity exceeds the capacity limit for this server.");
break;
case http_request_uri_too_long:
cherokee_buffer_add_str (buffer,
"The length of requested URL exceeds the capacity limit for this server.");
break;
case http_range_not_satisfiable:
cherokee_buffer_add_str (buffer,
"The requested range was not satisfiable.");
break;
case http_moved_permanently:
case http_moved_temporarily:
cherokee_buffer_add_str (buffer, "The document has moved <a href=\"");
cherokee_buffer_add_escape_html (buffer, &conn->redirect);
cherokee_buffer_add_str (buffer, "\">here</a>.");
break;
case http_unauthorized:
cherokee_buffer_add_str (buffer,
"This server could not verify that you are authorized to access the requested URL. "
"Either you supplied the wrong credentials (e.g., bad password), "
"or your browser doesn't know how to supply the credentials required.");
break;
case http_upgrade_required:
cherokee_buffer_add_str (buffer,
"The requested resource can only be retrieved using SSL. The server is "
"willing to upgrade the current connection to SSL, but your client doesn't "
"support it. Either upgrade your client, or try requesting the page "
"using https://");
break;
case http_unset:
SHOULDNT_HAPPEN;
break;
default:
break;
}
/* Add page footer
*/
cherokee_buffer_add_str (buffer, CRLF "<p><hr>" CRLF);
cherokee_buffer_add_buffer (buffer, &CONN_BIND(conn)->server_string_w_port);
cherokee_buffer_add_str (buffer, CRLF "</body>" CRLF "</html>" CRLF);
return ret_ok;
}
ret_t
cherokee_handler_error_init (cherokee_handler_error_t *hdl)
{
ret_t ret;
cherokee_connection_t *conn = HANDLER_CONN(hdl);
/* If needed then generate the error web page.
* Some HTTP response codes should not include body
* because it's forbidden by the RFC.
*/
if (http_code_with_body (conn->error_code)) {
ret = build_hardcoded_response_page (conn, &hdl->content);
if (unlikely(ret < ret_ok))
return ret;
}
return ret_ok;
}
ret_t
cherokee_handler_error_add_headers (cherokee_handler_error_t *hdl, cherokee_buffer_t *buffer)
{
cherokee_connection_t *conn = HANDLER_CONN(hdl);
/* It has special headers on protocol upgrading
*/
switch (conn->upgrade) {
case http_upgrade_nothing:
break;
case http_upgrade_tls10:
cherokee_buffer_add_str (buffer, "Upgrade: TLS/1.0, HTTP/1.1"CRLF);
break;
case http_upgrade_http11:
cherokee_buffer_add_str (buffer, "Upgrade: HTTP/1.1"CRLF);
break;
default:
SHOULDNT_HAPPEN;
}
/* 1xx, 204 and 304 (Not Modified) responses have to be managed
* by "content" handlers, anyway this test ensures that
* it'll never send wrong and unrelated headers in case that
* a 1xx, 204 or 304 response is managed by this handler.
* 304 responses should only include the
* Last-Modified, ETag, Expires and Cache-Control headers.
*/
if (!http_code_with_body (conn->error_code)) {
return ret_ok;
}
if (cherokee_connection_should_include_length(conn)) {
HANDLER(hdl)->support |= hsupport_length;
if (conn->error_code == http_range_not_satisfiable) {
/* The handler that attended the request has put the content
* length in conn->range_end in order to allow it to send the
* right length to the client.
*
* "Content-Range: bytes *" "/" FMT_OFFSET CRLF
*/
cherokee_buffer_add_str (buffer, "Content-Range: bytes */");
cherokee_buffer_add_ullong10(buffer, (cullong_t)conn->range_end);
cherokee_buffer_add_str (buffer, CRLF);
}
cherokee_buffer_add_str (buffer, "Content-Length: ");
cherokee_buffer_add_ulong10 (buffer, (culong_t) hdl->content.len);
cherokee_buffer_add_str (buffer, CRLF);
}
/* Usual headers
*/
cherokee_buffer_add_str (buffer, "Content-Type: text/html"CRLF);
if (http_type_400(conn->error_code) ||
http_type_500(conn->error_code))
{
cherokee_buffer_add_str (buffer, "Cache-Control: no-cache"CRLF);
cherokee_buffer_add_str (buffer, "Pragma: no-cache"CRLF);
}
return ret_ok;
}
ret_t
cherokee_handler_error_step (cherokee_handler_error_t *hdl, cherokee_buffer_t *buffer)
{
ret_t ret;
/* Usual content
*/
ret = cherokee_buffer_add_buffer (buffer, &hdl->content);
if (unlikely(ret < ret_ok))
return ret;
return ret_eof_have_data;
}