libmicrohttpd2

HTTP server C library (MHD 2.x, alpha)
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response_funcs.c (4573B)

      1 /* SPDX-License-Identifier: LGPL-2.1-or-later OR (GPL-2.0-or-later WITH eCos-exception-2.0) */
      2 /*
      3   This file is part of GNU libmicrohttpd.
      4   Copyright (C) 2024 Evgeny Grin (Karlson2k)
      5 
      6   GNU libmicrohttpd is free software; you can redistribute it and/or
      7   modify it under the terms of the GNU Lesser General Public
      8   License as published by the Free Software Foundation; either
      9   version 2.1 of the License, or (at your option) any later version.
     10 
     11   GNU libmicrohttpd is distributed in the hope that it will be useful,
     12   but WITHOUT ANY WARRANTY; without even the implied warranty of
     13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     14   Lesser General Public License for more details.
     15 
     16   Alternatively, you can redistribute GNU libmicrohttpd and/or
     17   modify it under the terms of the GNU General Public License as
     18   published by the Free Software Foundation; either version 2 of
     19   the License, or (at your option) any later version, together
     20   with the eCos exception, as follows:
     21 
     22     As a special exception, if other files instantiate templates or
     23     use macros or inline functions from this file, or you compile this
     24     file and link it with other works to produce a work based on this
     25     file, this file does not by itself cause the resulting work to be
     26     covered by the GNU General Public License. However the source code
     27     for this file must still be made available in accordance with
     28     section (3) of the GNU General Public License v2.
     29 
     30     This exception does not invalidate any other reasons why a work
     31     based on this file might be covered by the GNU General Public
     32     License.
     33 
     34   You should have received copies of the GNU Lesser General Public
     35   License and the GNU General Public License along with this library;
     36   if not, see <https://www.gnu.org/licenses/>.
     37 */
     38 
     39 /**
     40  * @file src/mhd2/response_funcs.c
     41  * @brief  The definition of the internal response helper functions
     42  * @author Karlson2k (Evgeny Grin)
     43  */
     44 
     45 #include "mhd_sys_options.h"
     46 
     47 #include "sys_malloc.h"
     48 
     49 #include "mhd_assert.h"
     50 #include "sys_null_macro.h"
     51 #include "mhd_response.h"
     52 #include "response_funcs.h"
     53 #include "mhd_locks.h"
     54 #include "response_options.h"
     55 
     56 #include "mhd_atomic_counter.h"
     57 
     58 
     59 MHD_INTERNAL
     60 MHD_FN_PAR_NONNULL_ALL_ bool
     61 response_make_reusable (struct MHD_Response *restrict r)
     62 {
     63   mhd_assert (! r->reuse.reusable);
     64   mhd_assert (! r->frozen);
     65   mhd_assert (NULL != r->settings);
     66 
     67   if (mhd_mutex_init (&(r->reuse.settings_lock)))
     68   {
     69     if (mhd_atomic_counter_init (&(r->reuse.counter), 1))
     70     {
     71       r->reuse.reusable = true;
     72       return true;
     73     }
     74     (void) mhd_mutex_destroy (&(r->reuse.settings_lock));
     75   }
     76   return false;
     77 }
     78 
     79 
     80 MHD_INTERNAL
     81 MHD_FN_PAR_NONNULL_ALL_ void
     82 mhd_response_deinit_reusable (struct MHD_Response *restrict r)
     83 {
     84   mhd_assert (r->reuse.reusable);
     85   mhd_assert (0 == mhd_atomic_counter_get (&(r->reuse.counter)));
     86 
     87   mhd_atomic_counter_deinit (&(r->reuse.counter));
     88   mhd_mutex_destroy_chk (&(r->reuse.settings_lock));
     89 }
     90 
     91 
     92 static MHD_FN_PAR_NONNULL_ALL_ void
     93 response_set_properties (struct MHD_Response *restrict r)
     94 {
     95   struct ResponseOptions *restrict const s = r->settings;
     96   mhd_assert (NULL != s);
     97 
     98   r->cfg.head_only = s->head_only_response;
     99   if (s->http_1_0_compatible_strict)
    100   {
    101     r->cfg.close_forced = true;
    102     r->cfg.chunked = false;
    103     r->cfg.mode_1_0 = s->http_1_0_server;
    104   }
    105   else if (s->http_1_0_server)
    106   {
    107     r->cfg.close_forced = s->conn_close || (MHD_SIZE_UNKNOWN == r->cntn_size);
    108     r->cfg.chunked = false;
    109     r->cfg.mode_1_0 = true;
    110   }
    111   else
    112   {
    113     r->cfg.close_forced = s->conn_close;
    114     r->cfg.chunked = s->chunked_enc || (MHD_SIZE_UNKNOWN == r->cntn_size);
    115     r->cfg.mode_1_0 = false;
    116   }
    117 
    118   r->cfg.cnt_len_by_app = s->insanity_header_content_length; // TODO: set only if "content-lengh" header is used
    119 
    120   // TODO: calculate size of the headers and the "Connection:" header
    121 
    122   r->frozen = true;
    123 
    124   r->settings = NULL;
    125   free (s);
    126 }
    127 
    128 
    129 MHD_INTERNAL MHD_FN_PAR_NONNULL_ALL_ void
    130 mhd_response_check_frozen_freeze (struct MHD_Response *restrict response)
    131 {
    132   bool need_unlock;
    133   if (response->frozen)
    134     return;
    135 
    136   if (response->reuse.reusable)
    137   {
    138     mhd_mutex_lock_chk (&(response->reuse.settings_lock));
    139     need_unlock = true;
    140   }
    141   else
    142     need_unlock = false;
    143 
    144   if (! response->frozen)/* Re-check under the lock */
    145   {
    146     mhd_assert ((! response->reuse.reusable) || \
    147                 (1 == mhd_atomic_counter_get (&(response->reuse.counter))));
    148     response_set_properties (response);
    149   }
    150 
    151   if (need_unlock)
    152     mhd_mutex_unlock_chk (&(response->reuse.settings_lock));
    153 }