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How to get data from override_list?
mod_ecl at ralf-stephan
Aug 7, 2020, 2:09 AM
Post #1 of 1 (103 views)
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Hello!



I use:

* Debian GNU/Linux (stretch)

* apache (2.4.25)

* libapr1 (1.5.2)

* https://httpd.apache.org/docs/2.4/developer/modguide.html



Preliminary:

I want to write an apache module.

But first I want a kind of info page.

To see how to use apache, apr, how to get and set data, ..., and
to practice how to programm using C.

So I use (step by step) the elements of struct 'request_rec' to
output the data of each of its elements.

Now, I see that struct 'htaccess_result' contains the elements
'dir', 'override', 'override_opts', 'override_list', 'htaccess'
and 'next'.

For how to use each element I search the apache source code for
useful examples.

But now I am stuck with the element 'override_list'.



The Problem(s):

'override_list' always equals 'NULL'.



The Question(s):

What is necessary to do so 'override_list' doesn't equal 'NULL'?

Do you know of a programming example somewhere online?



My Guess:

I searched the apache source code for an enlightening example but
I haven't found any solution yet.

I guess that at the moment my function 'printApRHtaccess' is
called 'override_list' doesn't contain at this moment any data.

And thus it contains 'NULL',

And I have to do something before 'printApRHtaccess' is called so
'override_list' contains any data.

I haven't found an example online yet.



My function 'printApRHtaccess' is at the moment:

#
# char * string = printApRHtaccess(request, request->htaccess)
#
char * printApRHtaccess(request_rec * request, const struct
htaccess_result * htaccess)
{
  struct htaccess_result * cache = NULL;

  char * dir = NULL;
  int override = 0;
  int override_opts = 0;
  apr_table_t * override_list = NULL;
  struct ap_conf_vector_t * _htaccess = NULL;

  char * string = "";
  int first = 1;

  const apr_array_header_t * fields = NULL;
  int count = 0;
  apr_table_entry_t * elements = NULL;
  int index = 0;

  for (cache = (struct htaccess_result *) htaccess; cache != NULL;
cache = (struct htaccess_result *) cache->next)
  {
    dir = (char *) cache->dir;
    override = cache->override;
    override_opts = cache->override_opts;
    override_list = cache->override_list;
    _htaccess = cache->htaccess;

    if (NULL != cache)
    {
      string = apr_pstrcat(request->pool, string,
apr_psprintf(request->pool, "dir = \"%s\"", dir), ", ", NULL);

      string = apr_pstrcat(request->pool, string,
apr_psprintf(request->pool, "override = \"%i\" (", override), NULL);

      first = 1;
      if (override & OR_NONE)
      {
        string = apr_pstrcat(request->pool, string, (first) ? "" : ",
", apr_psprintf(request->pool, "%s", "OR_NONE"), NULL);
        first = 0;
      }
      if (override & OR_LIMIT)
      {
        string = apr_pstrcat(request->pool, string, (first) ? "" : ",
", apr_psprintf(request->pool, "%s", "OR_LIMIT"), NULL);
        first = 0;
      }
      if (override & OR_OPTIONS)
      {
        string = apr_pstrcat(request->pool, string, (first) ? "" : ",
", apr_psprintf(request->pool, "%s", "OR_OPTIONS"), NULL);
        first = 0;
      }
      if (override & OR_FILEINFO)
      {
        string = apr_pstrcat(request->pool, string, (first) ? "" : ",
", apr_psprintf(request->pool, "%s", "OR_FILEINFO"), NULL);
        first = 0;
      }
      if (override & OR_AUTHCFG)
      {
        string = apr_pstrcat(request->pool, string, (first) ? "" : ",
", apr_psprintf(request->pool, "%s", "OR_AUTHCFG"), NULL);
        first = 0;
      }
      if (override & OR_INDEXES)
      {
        string = apr_pstrcat(request->pool, string, (first) ? "" : ",
", apr_psprintf(request->pool, "%s", "OR_INDEXES"), NULL);
        first = 0;
      }
      if (override & OR_UNSET)
      {
        string = apr_pstrcat(request->pool, string, (first) ? "" : ",
", apr_psprintf(request->pool, "%s", "OR_UNSET"), NULL);
        first = 0;
      }
      if (override & ACCESS_CONF)
      {
        string = apr_pstrcat(request->pool, string, (first) ? "" : ",
", apr_psprintf(request->pool, "%s", "ACCESS_CONF"), NULL);
        first = 0;
      }
      if (override & RSRC_CONF)
      {
        string = apr_pstrcat(request->pool, string, (first) ? "" : ",
", apr_psprintf(request->pool, "%s", "RSRC_CONF"), NULL);
        first = 0;
      }
      if (override & EXEC_ON_READ)
      {
        string = apr_pstrcat(request->pool, string, (first) ? "" : ",
", apr_psprintf(request->pool, "%s", "EXEC_ON_READ"), NULL);
        first = 0;
      }

      string = apr_pstrcat(request->pool, string, "), ", NULL);

      string = apr_pstrcat(request->pool, string,
apr_psprintf(request->pool, "override_opts = \"%i\" (", override_opts),
NULL);

      first = 1;
      if (override_opts & OPT_NONE)
      {
        string = apr_pstrcat(request->pool, string, (first) ? "" : ",
", apr_psprintf(request->pool, "%s", "OPT_NONE"), NULL);
        first = 0;
      }
      if (override_opts & OPT_INDEXES)
      {
        string = apr_pstrcat(request->pool, string, (first) ? "" : ",
", apr_psprintf(request->pool, "%s", "OPT_INDEXES"), NULL);
        first = 0;
      }
      if (override_opts & OPT_INCLUDES)
      {
        string = apr_pstrcat(request->pool, string, (first) ? "" : ",
", apr_psprintf(request->pool, "%s", "OPT_INCLUDES"), NULL);
        first = 0;
      }
      if (override_opts & OPT_SYM_LINKS)
      {
        string = apr_pstrcat(request->pool, string, (first) ? "" : ",
", apr_psprintf(request->pool, "%s", "OPT_SYM_LINKS"), NULL);
        first = 0;
      }
      if (override_opts & OPT_EXECCGI)
      {
        string = apr_pstrcat(request->pool, string, (first) ? "" : ",
", apr_psprintf(request->pool, "%s", "OPT_EXECCGI"), NULL);
        first = 0;
      }
      if (override_opts & OPT_UNSET)
      {
        string = apr_pstrcat(request->pool, string, (first) ? "" : ",
", apr_psprintf(request->pool, "%s", "OPT_UNSET"), NULL);
        first = 0;
      }
      if (override_opts & OPT_INC_WITH_EXEC)
      {
        string = apr_pstrcat(request->pool, string, (first) ? "" : ",
", apr_psprintf(request->pool, "%s", "OPT_INC_WITH_EXEC"), NULL);
        first = 0;
      }
      if (override_opts & OPT_SYM_OWNER)
      {
        string = apr_pstrcat(request->pool, string, (first) ? "" : ",
", apr_psprintf(request->pool, "%s", "OPT_SYM_OWNER"), NULL);
        first = 0;
      }
      if (override_opts & OPT_MULTI)
      {
        string = apr_pstrcat(request->pool, string, (first) ? "" : ",
", apr_psprintf(request->pool, "%s", "OPT_MULTI"), NULL);
        first = 0;
      }
      if (override_opts & OPT_ALL)
      {
        string = apr_pstrcat(request->pool, string, (first) ? "" : ",
", apr_psprintf(request->pool, "%s", "OPT_ALL"), NULL);
        first = 0;
      }

      string = apr_pstrcat(request->pool, string, "), ", NULL);



      if (NULL != override_list)
      {
        string = apr_pstrcat(request->pool, string,
apr_psprintf(request->pool, "%s", "(1:override_list:yes)"), NULL);

        apr_table_do(doApRHtaccess, request,
request->htaccess->override_list, NULL);
      }
      else
      {
        string = apr_pstrcat(request->pool, string,
apr_psprintf(request->pool, "%s", "(1:override_list:no)"), NULL);
      }

      if (NULL != override_list)
        //if (! apr_is_empty_table(override_list))
      {
        fields = apr_table_elts(override_list);
        //if (! apr_is_empty_array(fields))
        //{
          string = apr_pstrcat(request->pool, string,
apr_psprintf(request->pool, "%s", "(2:override_list:yes)"), NULL);

          count = fields->nelts;
          elements = (apr_table_entry_t *) fields->elts;
          for (index = 0; index < count; index++)
          {
            string = apr_pstrcat(request->pool, string,
apr_psprintf(request->pool, "(key=%s/value=%s)", elements[index].key,
elements[index].val), NULL);
          }
        //}
      }
      else
      {
        string = apr_pstrcat(request->pool, string,
apr_psprintf(request->pool, "%s", "(2:override_list:no)"), NULL);
      }

   }
  }

  return string;
}



As output in 'string' I get:

dir = "/var/www/html/mod_ecl/test.ecl/",

override = "31" (OR_LIMIT, OR_OPTIONS, OR_FILEINFO, OR_AUTHCFG, OR_INDEXES),

override_opts = "255" (OPT_INDEXES, OPT_INCLUDES, OPT_SYM_LINKS,
OPT_EXECCGI, OPT_UNSET, OPT_INC_WITH_EXEC, OPT_SYM_OWNER, OPT_MULTI,
OPT_ALL),

(1:override_list:no)

(2:override_list:no)

dir = "/var/www/html/mod_ecl/",

override = "31" (OR_LIMIT, OR_OPTIONS, OR_FILEINFO, OR_AUTHCFG, OR_INDEXES),

override_opts = "255" (OPT_INDEXES, OPT_INCLUDES, OPT_SYM_LINKS,
OPT_EXECCGI, OPT_UNSET, OPT_INC_WITH_EXEC, OPT_SYM_OWNER, OPT_MULTI,
OPT_ALL),

(1:override_list:no)

(2:override_list:no)



In '/etc/apache2/sites-available/default-ssl.conf' is:

# other content above ...

# there is no <Directory /var/www/html/> ... </Directory>

<Directory /var/www/html/mod_ecl/>
AllowOverride ALL
AllowOverrideList Rewrite RewriteEngine RewriteRule RewriteCond
</Directory>

# ... other content below



In '/var/www/html/mod_ecl/.htaccess' I added this to see If there
is any data in 'override_list':

RewriteEngine On
RewriteCond %{HTTP_HOST} ^www\.(.*)\.name-of-domain\.de$ [NC]
RewriteRule ^(.*)$ http://%1.name-of-domai.com/$1 [R=301,L]



There is no '/var/www/html/.htaccess'.



The url is:

https://localhost.localdomain/mod_ecl/test.ecl



Thanks for your help.

Ralf


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