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view src/http/ngx_http_header_filter_module.c @ 4247:b79dbadb3d5e stable-1.0

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Merging r4147, r4148, r4149, r4150, r4207: Fixes of combination of error_page and return directives: *) Fix for incorrect 201 replies from dav module. Replies with 201 code contain body, and we should clearly indicate it's empty if it's empty. Before 0.8.32 chunked was explicitly disabled for 201 replies and as a result empty body was indicated by connection close (not perfect, but worked). Since 0.8.32 chunked is enabled, and this causes incorrect responses from dav module when HTTP/1.1 is used: with "Transfer-Encoding: chunked" but no chunks at all. Fix is to actually return empty body in special response handler instead of abusing r->header_only flag. See here for initial report: http://mailman.nginx.org/pipermail/nginx-ru/2010-October/037535.html *) Fix for double content when return is used in error_page handler. Test case: location / { error_page 405 /nope; return 405; } location /nope { return 200; } This is expected to return 405 with empty body, but in 0.8.42+ will return builtin 405 error page as well (though not counted in Content-Length, thus breaking protocol). Fix is to use status provided by rewrite script execution in case it's less than NGX_HTTP_BAD_REQUEST even if r->error_status set. This check is in line with one in ngx_http_script_return_code(). Note that this patch also changes behaviour for "return 302 ..." and "rewrite ... redirect" used as error handler. E.g. location / { error_page 405 /redirect; return 405; } location /redirect { rewrite ^ http://example.com/; } will actually return redirect to "http://example.com/" instead of builtin 405 error page with meaningless Location header. This looks like correct change and it's in line with what happens on e.g. directory redirects in error handlers. *) Fix for "return 202" not discarding body. Big POST (not fully preread) to a location / { return 202; } resulted in incorrect behaviour due to "return" code path not calling ngx_http_discard_request_body(). The same applies to all "return" used with 2xx/3xx codes except 201 and 204, and to all "return ... text" uses. Fix is to add ngx_http_discard_request_body() call to ngx_http_send_response() function where it looks appropriate. Discard body call from emtpy gif module removed as it's now redundant. Reported by Pyry Hakulinen, see http://mailman.nginx.org/pipermail/nginx/2011-August/028503.html *) Incorrect special case for "return 204" removed. The special case in question leads to replies without body in configuration like location / { error_page 404 /zero; return 404; } location /zero { return 204; } while replies with empty body are expected per protocol specs. Correct one will look like if (status == NGX_HTTP_NO_CONTENT) { rc = ngx_http_send_header(r); if (rc == NGX_ERROR || r->header_only) { return rc; } return ngx_http_send_special(r, NGX_HTTP_LAST); } though it looks like it's better to drop this special case at all. *) Clear old Location header (if any) while adding a new one. This prevents incorrect behaviour when another redirect is issued within error_page 302 handler.
author Igor Sysoev <igor@sysoev.ru>
date Tue, 01 Nov 2011 13:45:33 +0000
parents a870639d2970
children 68b28a88749d
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_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 char ngx_http_server_string[] = "Server: nginx" CRLF;
static char ngx_http_server_full_string[] = "Server: " NGINX_VER 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_LEVEL_200  207
#define NGX_HTTP_LEVEL_200       (NGX_HTTP_LAST_LEVEL_200 - 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_null_string, */  /* "307 Temporary Redirect" */

#define NGX_HTTP_LAST_LEVEL_300  305
#define NGX_HTTP_LEVEL_300       (NGX_HTTP_LAST_LEVEL_300 - 301)

    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_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_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_null_string, */  /* "421 unused" */
    /* ngx_null_string, */  /* "422 Unprocessable Entity" */
    /* ngx_null_string, */  /* "423 Locked" */
    /* ngx_null_string, */  /* "424 Failed Dependency" */

#define NGX_HTTP_LAST_LEVEL_400  417
#define NGX_HTTP_LEVEL_400       (NGX_HTTP_LAST_LEVEL_400 - 400)

    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_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_LEVEL_500  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;
    struct sockaddr_in        *sin;
#if (NGX_HAVE_INET6)
    struct sockaddr_in6       *sin6;
#endif
    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_LEVEL_200)
        {
            /* 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_LEVEL_300)
        {
            /* 3XX */

            if (status == NGX_HTTP_NOT_MODIFIED) {
                r->header_only = 1;
            }

            status = status - NGX_HTTP_MOVED_PERMANENTLY + NGX_HTTP_LEVEL_200;
            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_LEVEL_400)
        {
            /* 4XX */
            status = status - NGX_HTTP_BAD_REQUEST
                            + NGX_HTTP_LEVEL_200
                            + NGX_HTTP_LEVEL_300;

            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_LEVEL_500)
        {
            /* 5XX */
            status = status - NGX_HTTP_INTERNAL_SERVER_ERROR
                            + NGX_HTTP_LEVEL_200
                            + NGX_HTTP_LEVEL_300
                            + NGX_HTTP_LEVEL_400;

            status_line = &ngx_http_status_lines[status];
            len += ngx_http_status_lines[status].len;

        } else {
            len += NGX_INT_T_LEN;
            status_line = NULL;
        }
    }

    clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);

    if (r->headers_out.server == NULL) {
        len += clcf->server_tokens ? sizeof(ngx_http_server_full_string) - 1:
                                     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] == '/')
    {
        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;
            }
        }

        switch (c->local_sockaddr->sa_family) {

#if (NGX_HAVE_INET6)
        case AF_INET6:
            sin6 = (struct sockaddr_in6 *) c->local_sockaddr;
            port = ntohs(sin6->sin6_port);
            break;
#endif
#if (NGX_HAVE_UNIX_DOMAIN)
        case AF_UNIX:
            port = 0;
            break;
#endif
        default: /* AF_INET */
            sin = (struct sockaddr_in *) c->local_sockaddr;
            port = ntohs(sin->sin_port);
            break;
        }

        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->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: closed" 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, "%ui", status);
    }
    *b->last++ = CR; *b->last++ = LF;

    if (r->headers_out.server == NULL) {
        if (clcf->server_tokens) {
            p = (u_char *) ngx_http_server_full_string;
            len = sizeof(ngx_http_server_full_string) - 1;

        } else {
            p = (u_char *) 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->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;
}