Mercurial > hg > nginx-ranges

view src/http/ngx_http_special_response.c @ 391:1d9bef53cd8e

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Range filter: late_ranges functionality. Add one more filtering point after postpone filter. This allows to serve range capable replies with subrequests. It's not as efficient as range filtering for static data (i.e. doesn't save us from reading data from disk if some filter needs them in memory), but it may save some network bandwidth for us and for our users.
author Maxim Dounin <mdounin@mdounin.ru>
date Mon, 21 Jul 2008 05:33:01 +0400
parents bc21d9cd9c54
children 349057ecf4d5
line wrap: on
line source


/*
 * 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_send_error_page(ngx_http_request_t *r,
    ngx_http_err_page_t *err_page);
static ngx_int_t ngx_http_send_special_response(ngx_http_request_t *r,
    ngx_http_core_loc_conf_t *clcf, ngx_uint_t err);
static ngx_int_t ngx_http_send_refresh(ngx_http_request_t *r);


static u_char ngx_http_error_full_tail[] =
"<hr><center>" NGINX_VER "</center>" CRLF
"</body>" CRLF
"</html>" CRLF
;


static u_char ngx_http_error_tail[] =
"<hr><center>nginx</center>" CRLF
"</body>" CRLF
"</html>" CRLF
;


static u_char ngx_http_msie_stub[] =
"<!-- The padding to disable MSIE's friendly error page -->" CRLF
"<!-- The padding to disable MSIE's friendly error page -->" CRLF
"<!-- The padding to disable MSIE's friendly error page -->" CRLF
"<!-- The padding to disable MSIE's friendly error page -->" CRLF
"<!-- The padding to disable MSIE's friendly error page -->" CRLF
"<!-- The padding to disable MSIE's friendly error page -->" CRLF
;


static u_char ngx_http_msie_refresh_head[] =
"<html><head><meta http-equiv=\"Refresh\" content=\"0; URL=";


static u_char ngx_http_msie_refresh_tail[] =
"\"></head><body></body></html>" CRLF;


static char ngx_http_error_301_page[] =
"<html>" CRLF
"<head><title>301 Moved Permanently</title></head>" CRLF
"<body bgcolor=\"white\">" CRLF
"<center><h1>301 Moved Permanently</h1></center>" CRLF
;


static char ngx_http_error_302_page[] =
"<html>" CRLF
"<head><title>302 Found</title></head>" CRLF
"<body bgcolor=\"white\">" CRLF
"<center><h1>302 Found</h1></center>" CRLF
;


static char ngx_http_error_400_page[] =
"<html>" CRLF
"<head><title>400 Bad Request</title></head>" CRLF
"<body bgcolor=\"white\">" CRLF
"<center><h1>400 Bad Request</h1></center>" CRLF
;


static char ngx_http_error_401_page[] =
"<html>" CRLF
"<head><title>401 Authorization Required</title></head>" CRLF
"<body bgcolor=\"white\">" CRLF
"<center><h1>401 Authorization Required</h1></center>" CRLF
;


static char ngx_http_error_402_page[] =
"<html>" CRLF
"<head><title>402 Payment Required</title></head>" CRLF
"<body bgcolor=\"white\">" CRLF
"<center><h1>402 Payment Required</h1></center>" CRLF
;


static char ngx_http_error_403_page[] =
"<html>" CRLF
"<head><title>403 Forbidden</title></head>" CRLF
"<body bgcolor=\"white\">" CRLF
"<center><h1>403 Forbidden</h1></center>" CRLF
;


static char ngx_http_error_404_page[] =
"<html>" CRLF
"<head><title>404 Not Found</title></head>" CRLF
"<body bgcolor=\"white\">" CRLF
"<center><h1>404 Not Found</h1></center>" CRLF
;


static char ngx_http_error_405_page[] =
"<html>" CRLF
"<head><title>405 Not Allowed</title></head>" CRLF
"<body bgcolor=\"white\">" CRLF
"<center><h1>405 Not Allowed</h1></center>" CRLF
;


static char ngx_http_error_406_page[] =
"<html>" CRLF
"<head><title>406 Not Acceptable</title></head>" CRLF
"<body bgcolor=\"white\">" CRLF
"<center><h1>406 Not Acceptable</h1></center>" CRLF
;


static char ngx_http_error_408_page[] =
"<html>" CRLF
"<head><title>408 Request Time-out</title></head>" CRLF
"<body bgcolor=\"white\">" CRLF
"<center><h1>408 Request Time-out</h1></center>" CRLF
;


static char ngx_http_error_409_page[] =
"<html>" CRLF
"<head><title>409 Conflict</title></head>" CRLF
"<body bgcolor=\"white\">" CRLF
"<center><h1>409 Conflict</h1></center>" CRLF
;


static char ngx_http_error_410_page[] =
"<html>" CRLF
"<head><title>410 Gone</title></head>" CRLF
"<body bgcolor=\"white\">" CRLF
"<center><h1>410 Gone</h1></center>" CRLF
;


static char ngx_http_error_411_page[] =
"<html>" CRLF
"<head><title>411 Length Required</title></head>" CRLF
"<body bgcolor=\"white\">" CRLF
"<center><h1>411 Length Required</h1></center>" CRLF
;


static char ngx_http_error_412_page[] =
"<html>" CRLF
"<head><title>412 Precondition Failed</title></head>" CRLF
"<body bgcolor=\"white\">" CRLF
"<center><h1>412 Precondition Failed</h1></center>" CRLF
;


static char ngx_http_error_413_page[] =
"<html>" CRLF
"<head><title>413 Request Entity Too Large</title></head>" CRLF
"<body bgcolor=\"white\">" CRLF
"<center><h1>413 Request Entity Too Large</h1></center>" CRLF
;


static char ngx_http_error_414_page[] =
"<html>" CRLF
"<head><title>414 Request-URI Too Large</title></head>" CRLF
"<body bgcolor=\"white\">" CRLF
"<center><h1>414 Request-URI Too Large</h1></center>" CRLF
;


static char ngx_http_error_415_page[] =
"<html>" CRLF
"<head><title>415 Unsupported Media Type</title></head>" CRLF
"<body bgcolor=\"white\">" CRLF
"<center><h1>415 Unsupported Media Type</h1></center>" CRLF
;


static char ngx_http_error_416_page[] =
"<html>" CRLF
"<head><title>416 Requested Range Not Satisfiable</title></head>" CRLF
"<body bgcolor=\"white\">" CRLF
"<center><h1>416 Requested Range Not Satisfiable</h1></center>" CRLF
;


static char ngx_http_error_495_page[] =
"<html>" CRLF
"<head><title>400 The SSL certificate error</title></head>"
CRLF
"<body bgcolor=\"white\">" CRLF
"<center><h1>400 Bad Request</h1></center>" CRLF
"<center>The SSL certificate error</center>" CRLF
;


static char ngx_http_error_496_page[] =
"<html>" CRLF
"<head><title>400 No required SSL certificate was sent</title></head>"
CRLF
"<body bgcolor=\"white\">" CRLF
"<center><h1>400 Bad Request</h1></center>" CRLF
"<center>No required SSL certificate was sent</center>" CRLF
;


static char ngx_http_error_497_page[] =
"<html>" CRLF
"<head><title>400 The plain HTTP request was sent to HTTPS port</title></head>"
CRLF
"<body bgcolor=\"white\">" CRLF
"<center><h1>400 Bad Request</h1></center>" CRLF
"<center>The plain HTTP request was sent to HTTPS port</center>" CRLF
;


static char ngx_http_error_500_page[] =
"<html>" CRLF
"<head><title>500 Internal Server Error</title></head>" CRLF
"<body bgcolor=\"white\">" CRLF
"<center><h1>500 Internal Server Error</h1></center>" CRLF
;


static char ngx_http_error_501_page[] =
"<html>" CRLF
"<head><title>501 Method Not Implemented</title></head>" CRLF
"<body bgcolor=\"white\">" CRLF
"<center><h1>501 Method Not Implemented</h1></center>" CRLF
;


static char ngx_http_error_502_page[] =
"<html>" CRLF
"<head><title>502 Bad Gateway</title></head>" CRLF
"<body bgcolor=\"white\">" CRLF
"<center><h1>502 Bad Gateway</h1></center>" CRLF
;


static char ngx_http_error_503_page[] =
"<html>" CRLF
"<head><title>503 Service Temporarily Unavailable</title></head>" CRLF
"<body bgcolor=\"white\">" CRLF
"<center><h1>503 Service Temporarily Unavailable</h1></center>" CRLF
;


static char ngx_http_error_504_page[] =
"<html>" CRLF
"<head><title>504 Gateway Time-out</title></head>" CRLF
"<body bgcolor=\"white\">" CRLF
"<center><h1>504 Gateway Time-out</h1></center>" CRLF
;


static char ngx_http_error_507_page[] =
"<html>" CRLF
"<head><title>507 Insufficient Storage</title></head>" CRLF
"<body bgcolor=\"white\">" CRLF
"<center><h1>507 Insufficient Storage</h1></center>" CRLF
;


static ngx_str_t ngx_http_error_pages[] = {

    ngx_null_string,                     /* 201, 204 */

#define NGX_HTTP_LEVEL_200  1

    /* ngx_null_string, */               /* 300 */
    ngx_string(ngx_http_error_301_page),
    ngx_string(ngx_http_error_302_page),
    ngx_null_string,                     /* 303 */

#define NGX_HTTP_LEVEL_300  3

    ngx_string(ngx_http_error_400_page),
    ngx_string(ngx_http_error_401_page),
    ngx_string(ngx_http_error_402_page),
    ngx_string(ngx_http_error_403_page),
    ngx_string(ngx_http_error_404_page),
    ngx_string(ngx_http_error_405_page),
    ngx_string(ngx_http_error_406_page),
    ngx_null_string,                     /* 407 */
    ngx_string(ngx_http_error_408_page),
    ngx_string(ngx_http_error_409_page),
    ngx_string(ngx_http_error_410_page),
    ngx_string(ngx_http_error_411_page),
    ngx_string(ngx_http_error_412_page),
    ngx_string(ngx_http_error_413_page),
    ngx_string(ngx_http_error_414_page),
    ngx_string(ngx_http_error_415_page),
    ngx_string(ngx_http_error_416_page),

#define NGX_HTTP_LEVEL_400  17

    ngx_string(ngx_http_error_495_page), /* 495, https certificate error */
    ngx_string(ngx_http_error_496_page), /* 496, https no certificate */
    ngx_string(ngx_http_error_497_page), /* 497, http to https */
    ngx_string(ngx_http_error_404_page), /* 498, canceled */
    ngx_null_string,                     /* 499, client has closed connection */

    ngx_string(ngx_http_error_500_page),
    ngx_string(ngx_http_error_501_page),
    ngx_string(ngx_http_error_502_page),
    ngx_string(ngx_http_error_503_page),
    ngx_string(ngx_http_error_504_page),
    ngx_null_string,                     /* 505 */
    ngx_null_string,                     /* 506 */
    ngx_string(ngx_http_error_507_page)
};


static ngx_str_t  ngx_http_get_name = { 3, (u_char *) "GET " };


ngx_int_t
ngx_http_special_response_handler(ngx_http_request_t *r, ngx_int_t error)
{
    ngx_int_t                  rc;
    ngx_uint_t                 i, err;
    ngx_http_err_page_t       *err_page;
    ngx_http_core_loc_conf_t  *clcf;

    ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                   "http special response: %d, \"%V?%V\"",
                   error, &r->uri, &r->args);

    rc = ngx_http_discard_request_body(r);

    if (rc == NGX_HTTP_INTERNAL_SERVER_ERROR) {
        error = NGX_HTTP_INTERNAL_SERVER_ERROR;
    }

    r->err_status = error;

    if (r->keepalive) {
        switch (error) {
            case NGX_HTTP_BAD_REQUEST:
            case NGX_HTTP_REQUEST_ENTITY_TOO_LARGE:
            case NGX_HTTP_REQUEST_URI_TOO_LARGE:
            case NGX_HTTP_TO_HTTPS:
            case NGX_HTTPS_CERT_ERROR:
            case NGX_HTTPS_NO_CERT:
            case NGX_HTTP_INTERNAL_SERVER_ERROR:
                r->keepalive = 0;
        }
    }

    if (r->lingering_close == 1) {
        switch (error) {
            case NGX_HTTP_BAD_REQUEST:
            case NGX_HTTP_TO_HTTPS:
            case NGX_HTTPS_CERT_ERROR:
            case NGX_HTTPS_NO_CERT:
                r->lingering_close = 0;
        }
    }

    r->headers_out.content_type.len = 0;

    clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);

    if (!r->error_page && clcf->error_pages) {

        if (clcf->recursive_error_pages == 0) {
            r->error_page = 1;
        }

        err_page = clcf->error_pages->elts;

        for (i = 0; i < clcf->error_pages->nelts; i++) {
            if (err_page[i].status == error) {
                return ngx_http_send_error_page(r, &err_page[i]);
            }
        }
    }

    if (clcf->msie_refresh
        && r->headers_in.msie
        && (error == NGX_HTTP_MOVED_PERMANENTLY
            || error == NGX_HTTP_MOVED_TEMPORARILY))
    {
        return ngx_http_send_refresh(r);
    }

    if (error == NGX_HTTP_CREATED) {
        /* 201 */
        err = 0;
        r->header_only = 1;

    } else if (error == NGX_HTTP_NO_CONTENT) {
        /* 204 */
        err = 0;

    } else if (error < NGX_HTTP_BAD_REQUEST) {
        /* 3XX */
        err = error - NGX_HTTP_MOVED_PERMANENTLY + NGX_HTTP_LEVEL_200;

    } else if (error < NGX_HTTP_OWN_CODES) {
        /* 4XX */
        err = error - NGX_HTTP_BAD_REQUEST + NGX_HTTP_LEVEL_200
                                           + NGX_HTTP_LEVEL_300;

    } else {
        /* 49X, 5XX */
        err = error - NGX_HTTP_OWN_CODES + NGX_HTTP_LEVEL_200
                                         + NGX_HTTP_LEVEL_300
                                         + NGX_HTTP_LEVEL_400;
        switch (error) {
            case NGX_HTTP_TO_HTTPS:
            case NGX_HTTPS_CERT_ERROR:
            case NGX_HTTPS_NO_CERT:
                r->err_status = NGX_HTTP_BAD_REQUEST;
                break;
        }
    }

    return ngx_http_send_special_response(r, clcf, err);
}


static ngx_int_t
ngx_http_send_error_page(ngx_http_request_t *r, ngx_http_err_page_t *err_page)
{
    u_char                     ch, *p, *last;
    ngx_str_t                 *uri, *args, u, a;
    ngx_table_elt_t           *location;
    ngx_http_core_loc_conf_t  *clcf;

    r->err_status = err_page->overwrite;

    r->zero_in_uri = 0;

    if (err_page->uri_lengths) {
        if (ngx_http_script_run(r, &u, err_page->uri_lengths->elts, 0,
                                err_page->uri_values->elts)
            == NULL)
        {
            return NGX_ERROR;
        }

        p = u.data;
        uri = &u;
        args = NULL;

        if (*p == '/') {

            last = p + uri->len;

            while (p < last) {

                ch = *p++;

                if (ch == '?') {
                    a.len = last - p;
                    a.data = p;
                    args = &a;

                    u.len = p - 1 - u.data;

                    while (p < last) {
                        if (*p++ == '\0') {
                            r->zero_in_uri = 1;
                            break;
                        }
                    }

                    break;
                }

                if (ch == '\0') {
                    r->zero_in_uri = 1;
                    continue;
                }
            }
        }

    } else {
        uri = &err_page->uri;
        args = &err_page->args;
    }

    if (uri->data[0] == '/') {

        r->method = NGX_HTTP_GET;
        r->method_name = ngx_http_get_name;

        return ngx_http_internal_redirect(r, uri, args);
    }

    if (uri->data[0] == '@') {
        return ngx_http_named_location(r, uri);
    }

    location = ngx_list_push(&r->headers_out.headers);

    if (location == NULL) {
        return NGX_ERROR;
    }

    r->err_status = NGX_HTTP_MOVED_TEMPORARILY;

    location->hash = 1;
    location->key.len = sizeof("Location") - 1;
    location->key.data = (u_char *) "Location";
    location->value = *uri;

    r->headers_out.location = location;

    clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);

    if (clcf->msie_refresh && r->headers_in.msie) {
        return ngx_http_send_refresh(r);
    }

    return ngx_http_send_special_response(r, clcf, NGX_HTTP_MOVED_TEMPORARILY
                                                   - NGX_HTTP_MOVED_PERMANENTLY
                                                   + NGX_HTTP_LEVEL_200);
}


static ngx_int_t
ngx_http_send_special_response(ngx_http_request_t *r,
    ngx_http_core_loc_conf_t *clcf, ngx_uint_t err)
{
    u_char       *tail;
    size_t        len;
    ngx_int_t     rc;
    ngx_buf_t    *b;
    ngx_uint_t    msie_padding;
    ngx_chain_t   out[3];

    if (clcf->server_tokens) {
        len = sizeof(ngx_http_error_full_tail) - 1;
        tail = ngx_http_error_full_tail;

    } else {
        len = sizeof(ngx_http_error_tail) - 1;
        tail = ngx_http_error_tail;
    }

    msie_padding = 0;

    if (!r->zero_body) {
        if (ngx_http_error_pages[err].len) {
            r->headers_out.content_length_n = ngx_http_error_pages[err].len
                                              + len;
            if (clcf->msie_padding
                && r->headers_in.msie
                && r->http_version >= NGX_HTTP_VERSION_10
                && err >= NGX_HTTP_LEVEL_300)
            {
                r->headers_out.content_length_n +=
                                                sizeof(ngx_http_msie_stub) - 1;
                msie_padding = 1;
            }

            r->headers_out.content_type_len = sizeof("text/html") - 1;
            r->headers_out.content_type.len = sizeof("text/html") - 1;
            r->headers_out.content_type.data = (u_char *) "text/html";

        } else {
            r->headers_out.content_length_n = -1;
        }

    } else {
        r->headers_out.content_length_n = 0;
        err = 0;
    }

    if (r->headers_out.content_length) {
        r->headers_out.content_length->hash = 0;
        r->headers_out.content_length = NULL;
    }

    ngx_http_clear_accept_ranges(r);
    ngx_http_clear_last_modified(r);

    rc = ngx_http_send_header(r);

    if (rc == NGX_ERROR || r->header_only) {
        return rc;
    }

    if (ngx_http_error_pages[err].len == 0) {
        return NGX_OK;
    }

    b = ngx_calloc_buf(r->pool);
    if (b == NULL) {
        return NGX_ERROR;
    }

    b->memory = 1;
    b->pos = ngx_http_error_pages[err].data;
    b->last = ngx_http_error_pages[err].data + ngx_http_error_pages[err].len;

    out[0].buf = b;
    out[0].next = &out[1];

    b = ngx_calloc_buf(r->pool);
    if (b == NULL) {
        return NGX_ERROR;
    }

    b->memory = 1;

    b->pos = tail;
    b->last = tail + len;

    out[1].buf = b;
    out[1].next = NULL;

    if (msie_padding) {
        b = ngx_calloc_buf(r->pool);
        if (b == NULL) {
            return NGX_ERROR;
        }

        b->memory = 1;
        b->pos = ngx_http_msie_stub;
        b->last = ngx_http_msie_stub + sizeof(ngx_http_msie_stub) - 1;

        out[1].next = &out[2];
        out[2].buf = b;
        out[2].next = NULL;
    }

    if (r == r->main) {
        b->last_buf = 1;
    }

    b->last_in_chain = 1;

    return ngx_http_output_filter(r, &out[0]);
}


static ngx_int_t
ngx_http_send_refresh(ngx_http_request_t *r)
{
    u_char       *p, *location;
    size_t        len, size;
    uintptr_t     escape;
    ngx_int_t     rc;
    ngx_buf_t    *b;
    ngx_chain_t   out;

    len = r->headers_out.location->value.len;
    location = r->headers_out.location->value.data;

    escape = 2 * ngx_escape_uri(NULL, location, len, NGX_ESCAPE_REFRESH);

    size = sizeof(ngx_http_msie_refresh_head) - 1
           + escape + len
           + sizeof(ngx_http_msie_refresh_tail) - 1;

    r->err_status = NGX_HTTP_OK;

    r->headers_out.content_type_len = sizeof("text/html") - 1;
    r->headers_out.content_type.len = sizeof("text/html") - 1;
    r->headers_out.content_type.data = (u_char *) "text/html";

    r->headers_out.location->hash = 0;
    r->headers_out.location = NULL;

    r->headers_out.content_length_n = size;

    if (r->headers_out.content_length) {
        r->headers_out.content_length->hash = 0;
        r->headers_out.content_length = NULL;
    }

    ngx_http_clear_accept_ranges(r);
    ngx_http_clear_last_modified(r);

    rc = ngx_http_send_header(r);

    if (rc == NGX_ERROR || r->header_only) {
        return rc;
    }

    b = ngx_create_temp_buf(r->pool, size);
    if (b == NULL) {
        return NGX_ERROR;
    }

    p = ngx_cpymem(b->pos, ngx_http_msie_refresh_head,
                   sizeof(ngx_http_msie_refresh_head) - 1);

    if (escape == 0) {
        p = ngx_cpymem(p, location, len);

    } else {
        p = (u_char *) ngx_escape_uri(p, location, len, NGX_ESCAPE_REFRESH);
    }

    b->last = ngx_cpymem(p, ngx_http_msie_refresh_tail,
                         sizeof(ngx_http_msie_refresh_tail) - 1);

    b->last_buf = 1;
    b->last_in_chain = 1;

    out.buf = b;
    out.next = NULL;

    return ngx_http_output_filter(r, &out);
}