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view src/http/modules/ngx_http_browser_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 c7d57b539248
children d620f497c50f
line wrap: on
line source


/*
 * Copyright (C) Igor Sysoev
 */


#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>


/*
 * The module can check browser versions conforming to the following formats:
 * X, X.X, X.X.X, and X.X.X.X.  The maximum values of each format may be
 * 4000, 4000.99, 4000.99.99, and 4000.99.99.99.
 */


#define  NGX_HTTP_MODERN_BROWSER   0
#define  NGX_HTTP_ANCIENT_BROWSER  1


typedef struct {
    u_char                      browser[12];
    size_t                      skip;
    size_t                      add;
    u_char                      name[12];
} ngx_http_modern_browser_mask_t;


typedef struct {
    ngx_uint_t                  version;
    size_t                      skip;
    size_t                      add;
    u_char                      name[12];
} ngx_http_modern_browser_t;


typedef struct {
    ngx_str_t                   name;
    ngx_http_get_variable_pt    handler;
    uintptr_t                   data;
} ngx_http_browser_variable_t;


typedef struct {
    ngx_array_t                *modern_browsers;
    ngx_array_t                *ancient_browsers;
    ngx_http_variable_value_t  *modern_browser_value;
    ngx_http_variable_value_t  *ancient_browser_value;

    unsigned                    modern_unlisted_browsers:1;
    unsigned                    netscape4:1;
} ngx_http_browser_conf_t;


static ngx_int_t ngx_http_msie_variable(ngx_http_request_t *r,
    ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_browser_variable(ngx_http_request_t *r,
    ngx_http_variable_value_t *v, uintptr_t data);

static ngx_uint_t ngx_http_browser(ngx_http_request_t *r,
    ngx_http_browser_conf_t *cf);

static ngx_int_t ngx_http_browser_add_variable(ngx_conf_t *cf);
static void *ngx_http_browser_create_conf(ngx_conf_t *cf);
static char *ngx_http_browser_merge_conf(ngx_conf_t *cf, void *parent,
    void *child);
static int ngx_libc_cdecl ngx_http_modern_browser_sort(const void *one,
    const void *two);
static char *ngx_http_modern_browser(ngx_conf_t *cf, ngx_command_t *cmd,
    void *conf);
static char *ngx_http_ancient_browser(ngx_conf_t *cf, ngx_command_t *cmd,
    void *conf);
static char *ngx_http_modern_browser_value(ngx_conf_t *cf, ngx_command_t *cmd,
    void *conf);
static char *ngx_http_ancient_browser_value(ngx_conf_t *cf, ngx_command_t *cmd,
    void *conf);


static ngx_command_t  ngx_http_browser_commands[] = {

    { ngx_string("modern_browser"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE12,
      ngx_http_modern_browser,
      NGX_HTTP_LOC_CONF_OFFSET,
      0,
      NULL },

    { ngx_string("ancient_browser"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_1MORE,
      ngx_http_ancient_browser,
      NGX_HTTP_LOC_CONF_OFFSET,
      0,
      NULL },

    { ngx_string("modern_browser_value"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
      ngx_http_modern_browser_value,
      NGX_HTTP_LOC_CONF_OFFSET,
      0,
      NULL },

    { ngx_string("ancient_browser_value"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
      ngx_http_ancient_browser_value,
      NGX_HTTP_LOC_CONF_OFFSET,
      0,
      NULL },

      ngx_null_command
};


static ngx_http_module_t  ngx_http_browser_module_ctx = {
    ngx_http_browser_add_variable,         /* preconfiguration */
    NULL,                                  /* postconfiguration */

    NULL,                                  /* create main configuration */
    NULL,                                  /* init main configuration */

    NULL,                                  /* create server configuration */
    NULL,                                  /* merge server configuration */

    ngx_http_browser_create_conf,          /* create location configuration */
    ngx_http_browser_merge_conf            /* merge location configuration */
};


ngx_module_t  ngx_http_browser_module = {
    NGX_MODULE_V1,
    &ngx_http_browser_module_ctx,          /* module context */
    ngx_http_browser_commands,             /* 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 ngx_http_modern_browser_mask_t  ngx_http_modern_browser_masks[] = {

    /* Opera must be the first browser to check */

    /*
     * "Opera/7.50 (X11; FreeBSD i386; U)  [en]"
     * "Mozilla/5.0 (X11; FreeBSD i386; U) Opera 7.50  [en]"
     * "Mozilla/4.0 (compatible; MSIE 6.0; X11; FreeBSD i386) Opera 7.50  [en]"
     * "Opera/8.0 (Windows NT 5.1; U; ru)"
     * "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0; en) Opera 8.0"
     * "Opera/9.01 (X11; FreeBSD 6 i386; U; en)"
     */

    { "opera",
      0,
      sizeof("Opera ") - 1,
      "Opera"},

    /* "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)" */

    { "msie",
      sizeof("Mozilla/4.0 (compatible; ") - 1,
      sizeof("MSIE ") - 1,
      "MSIE "},

    /*
     * "Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.0.0) Gecko/20020610"
     * "Mozilla/5.0 (Windows; U; Windows NT 5.1; ru-RU; rv:1.5) Gecko/20031006"
     * "Mozilla/5.0 (Windows; U; Windows NT 5.1; ru-RU; rv:1.6) Gecko/20040206
     *              Firefox/0.8"
     * "Mozilla/5.0 (Windows; U; Windows NT 5.1; ru-RU; rv:1.7.8)
     *              Gecko/20050511 Firefox/1.0.4"
     * "Mozilla/5.0 (X11; U; FreeBSD i386; en-US; rv:1.8.0.5) Gecko/20060729
     *              Firefox/1.5.0.5"
     */

    { "gecko",
      sizeof("Mozilla/5.0 (") - 1,
      sizeof("rv:") - 1,
      "rv:"},

    /*
     * "Mozilla/5.0 (Macintosh; U; PPC Mac OS X; ru-ru) AppleWebKit/125.2
     *              (KHTML, like Gecko) Safari/125.7"
     * "Mozilla/5.0 (SymbianOS/9.1; U; en-us) AppleWebKit/413
     *              (KHTML, like Gecko) Safari/413"
     * "Mozilla/5.0 (Macintosh; U; PPC Mac OS X; en) AppleWebKit/418
     *              (KHTML, like Gecko) Safari/417.9.3"
     * "Mozilla/5.0 (Macintosh; U; PPC Mac OS X; ru-ru) AppleWebKit/418.8
     *              (KHTML, like Gecko) Safari/419.3"
     */

    { "safari",
      sizeof("Mozilla/5.0 (") - 1,
      sizeof("Safari/") - 1,
      "Safari/"},

    /*
     * "Mozilla/5.0 (compatible; Konqueror/3.1; Linux)"
     * "Mozilla/5.0 (compatible; Konqueror/3.4; Linux) KHTML/3.4.2 (like Gecko)"
     * "Mozilla/5.0 (compatible; Konqueror/3.5; FreeBSD) KHTML/3.5.1
     *              (like Gecko)"
     */

    { "konqueror",
      sizeof("Mozilla/5.0 (compatible; ") - 1,
      sizeof("Konqueror/") - 1,
      "Konqueror/"},

    { "", 0, 0, "" }

};


static ngx_http_browser_variable_t  ngx_http_browsers[] = {
    { ngx_string("msie"), ngx_http_msie_variable, 0 },
    { ngx_string("modern_browser"), ngx_http_browser_variable,
          NGX_HTTP_MODERN_BROWSER },
    { ngx_string("ancient_browser"), ngx_http_browser_variable,
          NGX_HTTP_ANCIENT_BROWSER },
    { ngx_null_string, NULL, 0 }
};


static ngx_int_t
ngx_http_browser_variable(ngx_http_request_t *r, ngx_http_variable_value_t *v,
    uintptr_t data)
{
    ngx_uint_t                rc;
    ngx_http_browser_conf_t  *cf;

    cf = ngx_http_get_module_loc_conf(r, ngx_http_browser_module);

    rc = ngx_http_browser(r, cf);

    if (data == NGX_HTTP_MODERN_BROWSER && rc == NGX_HTTP_MODERN_BROWSER) {
        *v = *cf->modern_browser_value;
        return NGX_OK;
    }

    if (data == NGX_HTTP_ANCIENT_BROWSER && rc == NGX_HTTP_ANCIENT_BROWSER) {
        *v = *cf->ancient_browser_value;
        return NGX_OK;
    }

    *v = ngx_http_variable_null_value;
    return NGX_OK;
}


static ngx_uint_t
ngx_http_browser(ngx_http_request_t *r, ngx_http_browser_conf_t *cf)
{
    size_t                      len;
    u_char                     *name, *ua, *last, c;
    ngx_str_t                  *ancient;
    ngx_uint_t                  i, version, ver, scale;
    ngx_http_modern_browser_t  *modern;

    if (r->headers_in.user_agent == NULL) {
        if (cf->modern_unlisted_browsers) {
            return NGX_HTTP_MODERN_BROWSER;
        }

        return NGX_HTTP_ANCIENT_BROWSER;
    }

    ua = r->headers_in.user_agent->value.data;
    len = r->headers_in.user_agent->value.len;
    last = ua + len;

    if (cf->modern_browsers) {
        modern = cf->modern_browsers->elts;

        for (i = 0; i < cf->modern_browsers->nelts; i++) {
            name = ua + modern[i].skip;

            if (name >= last) {
                continue;
            }

            name = (u_char *) ngx_strstr(name, modern[i].name);

            if (name == NULL) {
                continue;
            }

            ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                           "browser: \"%s\"", name);

            name += modern[i].add;

            if (name >= last) {
                continue;
            }

            ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                           "version: \"%ui\" \"%s\"", modern[i].version, name);

            version = 0;
            ver = 0;
            scale = 1000000;

            while (name < last) {

                c = *name++;

                if (c >= '0' && c <= '9') {
                    ver = ver * 10 + (c - '0');
                    continue;
                }

                if (c == '.') {
                    version += ver * scale;

                    ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                                   "version: \"%ui\" \"%ui\"",
                                   modern[i].version, version);

                    if (version > modern[i].version) {
                        return NGX_HTTP_MODERN_BROWSER;
                    }

                    ver = 0;
                    scale /= 100;
                    continue;
                }

                break;
            }

            version += ver * scale;

            ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                           "version: \"%ui\" \"%ui\"",
                           modern[i].version, version);

            if (version >= modern[i].version) {
                return NGX_HTTP_MODERN_BROWSER;
            }

            return NGX_HTTP_ANCIENT_BROWSER;
        }

        if (!cf->modern_unlisted_browsers) {
            return NGX_HTTP_ANCIENT_BROWSER;
        }
    }

    if (cf->netscape4) {
        if (len > sizeof("Mozilla/4.72 ") - 1
            && ngx_strncmp(ua, "Mozilla/", sizeof("Mozilla/") - 1) == 0
            && ua[8] > '0' && ua[8] < '5')
        {
            return NGX_HTTP_ANCIENT_BROWSER;
        }
    }

    if (cf->ancient_browsers) {
        ancient = cf->ancient_browsers->elts;

        for (i = 0; i < cf->ancient_browsers->nelts; i++) {
            if (len >= ancient[i].len
                && ngx_strstr(ua, ancient[i].data) != NULL)
            {
                return NGX_HTTP_ANCIENT_BROWSER;
            }
        }
    }

    if (cf->modern_unlisted_browsers) {
        return NGX_HTTP_MODERN_BROWSER;
    }

    return NGX_HTTP_ANCIENT_BROWSER;
}


static ngx_int_t
ngx_http_msie_variable(ngx_http_request_t *r, ngx_http_variable_value_t *v,
    uintptr_t data)
{
    if (r->headers_in.msie) {
        *v = ngx_http_variable_true_value;
        return NGX_OK;
    }

    *v = ngx_http_variable_null_value;
    return NGX_OK;
}


static ngx_int_t
ngx_http_browser_add_variable(ngx_conf_t *cf)
{
    ngx_http_browser_variable_t   *var;
    ngx_http_variable_t           *v;

    for (var = ngx_http_browsers; var->name.len; var++) {

        v = ngx_http_add_variable(cf, &var->name, NGX_HTTP_VAR_CHANGEABLE);
        if (v == NULL) {
            return NGX_ERROR;
        }

        v->get_handler = var->handler;
        v->data = var->data;
    }

    return NGX_OK;
}


static void *
ngx_http_browser_create_conf(ngx_conf_t *cf)
{
    ngx_http_browser_conf_t  *conf;

    conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_browser_conf_t));
    if (conf == NULL) {
        return NULL;
    }

    /*
     * set by ngx_pcalloc():
     *
     *     conf->modern_browsers = NULL;
     *     conf->ancient_browsers = NULL;
     *     conf->modern_browser_value = NULL;
     *     conf->ancient_browser_value = NULL;
     *
     *     conf->modern_unlisted_browsers = 0;
     *     conf->netscape4 = 0;
     */

    return conf;
}


static char *
ngx_http_browser_merge_conf(ngx_conf_t *cf, void *parent, void *child)
{
    ngx_http_browser_conf_t *prev = parent;
    ngx_http_browser_conf_t *conf = child;

    ngx_uint_t                  i, n;
    ngx_http_modern_browser_t  *browsers, *opera;

    /*
     * At the merge the skip field is used to store the browser slot,
     * it will be used in sorting and then will overwritten
     * with a real skip value.  The zero value means Opera.
     */

    if (conf->modern_browsers == NULL) {
        conf->modern_browsers = prev->modern_browsers;

    } else {
        browsers = conf->modern_browsers->elts;

        for (i = 0; i < conf->modern_browsers->nelts; i++) {
            if (browsers[i].skip == 0) {
                goto found;
            }
        }

        /*
         * Opera may contain MSIE string, so if Opera was not enumerated
         * as modern browsers, then add it and set a unreachable version
         */

        opera = ngx_array_push(conf->modern_browsers);
        if (opera == NULL) {
            return NGX_CONF_ERROR;
        }

        opera->skip = 0;
        opera->version = 4001000000U;

        browsers = conf->modern_browsers->elts;

found:

        ngx_qsort(browsers, (size_t) conf->modern_browsers->nelts,
                  sizeof(ngx_http_modern_browser_t),
                  ngx_http_modern_browser_sort);

        for (i = 0; i < conf->modern_browsers->nelts; i++) {
             n = browsers[i].skip;

             browsers[i].skip = ngx_http_modern_browser_masks[n].skip;
             browsers[i].add = ngx_http_modern_browser_masks[n].add;
             (void) ngx_cpystrn(browsers[i].name,
                                ngx_http_modern_browser_masks[n].name, 12);
        }
    }

    if (conf->ancient_browsers == NULL) {
        conf->ancient_browsers = prev->ancient_browsers;
    }

    if (conf->modern_browser_value == NULL) {
        conf->modern_browser_value = prev->modern_browser_value;
    }

    if (conf->modern_browser_value == NULL) {
        conf->modern_browser_value = &ngx_http_variable_true_value;
    }

    if (conf->ancient_browser_value == NULL) {
        conf->ancient_browser_value = prev->ancient_browser_value;
    }

    if (conf->ancient_browser_value == NULL) {
        conf->ancient_browser_value = &ngx_http_variable_true_value;
    }

    return NGX_CONF_OK;
}


static int ngx_libc_cdecl
ngx_http_modern_browser_sort(const void *one, const void *two)
{
    ngx_http_modern_browser_t *first = (ngx_http_modern_browser_t *) one;
    ngx_http_modern_browser_t *second = (ngx_http_modern_browser_t *) two;

    return (first->skip - second->skip);
}


static char *
ngx_http_modern_browser(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
    ngx_http_browser_conf_t *bcf = conf;

    u_char                           c;
    ngx_str_t                       *value;
    ngx_uint_t                       i, n, version, ver, scale;
    ngx_http_modern_browser_t       *browser;
    ngx_http_modern_browser_mask_t  *mask;

    value = cf->args->elts;

    if (cf->args->nelts == 2) {
        if (ngx_strcmp(value[1].data, "unlisted") == 0) {
            bcf->modern_unlisted_browsers = 1;
            return NGX_CONF_OK;
        }

        return NGX_CONF_ERROR;
    }

    if (bcf->modern_browsers == NULL) {
        bcf->modern_browsers = ngx_array_create(cf->pool, 5,
                                            sizeof(ngx_http_modern_browser_t));
        if (bcf->modern_browsers == NULL) {
            return NGX_CONF_ERROR;
        }
    }

    browser = ngx_array_push(bcf->modern_browsers);
    if (browser == NULL) {
        return NGX_CONF_ERROR;
    }

    mask = ngx_http_modern_browser_masks;

    for (n = 0; mask[n].browser[0] != '\0'; n++) {
        if (ngx_strcasecmp(mask[n].browser, value[1].data) == 0) {
            goto found;
        }
    }

    ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                       "unknown browser name \"%V\"", &value[1]);

    return NGX_CONF_ERROR;

found:

    /*
     * at this stage the skip field is used to store the browser slot,
     * it will be used in sorting in merge stage and then will overwritten
     * with a real value
     */

    browser->skip = n;

    version = 0;
    ver = 0;
    scale = 1000000;

    for (i = 0; i < value[2].len; i++) {

        c = value[2].data[i];

        if (c >= '0' && c <= '9') {
            ver = ver * 10 + (c - '0');
            continue;
        }

        if (c == '.') {
            version += ver * scale;
            ver = 0;
            scale /= 100;
            continue;
        }

        ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                           "invalid browser version \"%V\"", &value[2]);

        return NGX_CONF_ERROR;
    }

    version += ver * scale;

    browser->version = version;

    return NGX_CONF_OK;
}


static char *
ngx_http_ancient_browser(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
    ngx_http_browser_conf_t *bcf = conf;

    ngx_str_t   *value, *browser;
    ngx_uint_t   i;

    value = cf->args->elts;

    for (i = 1; i < cf->args->nelts; i++) {
        if (ngx_strcmp(value[i].data, "netscape4") == 0) {
            bcf->netscape4 = 1;
            continue;
        }

        if (bcf->ancient_browsers == NULL) {
            bcf->ancient_browsers = ngx_array_create(cf->pool, 4,
                                                     sizeof(ngx_str_t));
            if (bcf->ancient_browsers == NULL) {
                return NGX_CONF_ERROR;
            }
        }

        browser = ngx_array_push(bcf->ancient_browsers);
        if (browser == NULL) {
            return NGX_CONF_ERROR;
        }

        *browser = value[i];
    }

    return NGX_CONF_OK;
}


static char *
ngx_http_modern_browser_value(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
    ngx_http_browser_conf_t *bcf = conf;

    ngx_str_t  *value;

    bcf->modern_browser_value = ngx_palloc(cf->pool,
                                           sizeof(ngx_http_variable_value_t));
    if (bcf->modern_browser_value == NULL) {
        return NGX_CONF_ERROR;
    }

    value = cf->args->elts;

    bcf->modern_browser_value->len = value[1].len;
    bcf->modern_browser_value->valid = 1;
    bcf->modern_browser_value->no_cacheable = 0;
    bcf->modern_browser_value->not_found = 0;
    bcf->modern_browser_value->data = value[1].data;

    return NGX_CONF_OK;
}


static char *
ngx_http_ancient_browser_value(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
    ngx_http_browser_conf_t *bcf = conf;

    ngx_str_t  *value;

    bcf->ancient_browser_value = ngx_palloc(cf->pool,
                                            sizeof(ngx_http_variable_value_t));
    if (bcf->ancient_browser_value == NULL) {
        return NGX_CONF_ERROR;
    }

    value = cf->args->elts;

    bcf->ancient_browser_value->len = value[1].len;
    bcf->ancient_browser_value->valid = 1;
    bcf->ancient_browser_value->no_cacheable = 0;
    bcf->ancient_browser_value->not_found = 0;
    bcf->ancient_browser_value->data = value[1].data;

    return NGX_CONF_OK;
}