respond_with_error.c (4899B)
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/respond_with_error.c 41 * @brief The implementation of error response functions 42 * @author Karlson2k (Evgeny Grin) 43 */ 44 45 #include "mhd_sys_options.h" 46 #include "respond_with_error.h" 47 48 #include "sys_base_types.h" 49 #include "sys_null_macro.h" 50 #include "mhd_str_macros.h" 51 52 #include "mhd_assert.h" 53 54 #include "sys_malloc.h" 55 56 #include "mhd_connection.h" 57 58 #include "mempool_funcs.h" 59 60 #include "response_from.h" 61 #include "daemon_logger.h" 62 #include "response_destroy.h" 63 #include "stream_funcs.h" 64 #include "daemon_funcs.h" 65 66 #include "mhd_public_api.h" 67 68 MHD_INTERNAL 69 MHD_FN_PAR_NONNULL_ (1) 70 MHD_FN_PAR_CSTR_ (4) MHD_FN_PAR_CSTR_ (6) void 71 respond_with_error_len (struct MHD_Connection *c, 72 unsigned int http_code, 73 size_t msg_len, 74 const char *msg, 75 size_t add_hdr_line_len, 76 char *add_hdr_line) 77 { 78 struct MHD_Response *err_res; 79 80 mhd_assert (! c->stop_with_error); /* Do not send error twice */ 81 mhd_assert (mhd_HTTP_STAGE_REQ_RECV_FINISHED >= c->stage); 82 83 /* Discard most of the request data */ 84 85 if (NULL != c->rq.cntn.lbuf.data) 86 mhd_daemon_free_lbuf (c->daemon, &(c->rq.cntn.lbuf)); 87 c->rq.cntn.lbuf.data = NULL; 88 89 c->write_buffer = NULL; 90 c->write_buffer_size = 0; 91 c->write_buffer_send_offset = 0; 92 c->write_buffer_append_offset = 0; 93 94 mhd_DLINKEDL_INIT_LIST (&(c->rq), fields); 95 c->rq.version = NULL; 96 c->rq.method.len = 0; 97 c->rq.method.cstr = NULL; 98 c->rq.url = NULL; 99 c->continue_message_write_offset = 0; 100 if (0 != c->read_buffer_size) 101 { 102 mhd_pool_deallocate (c->pool, 103 c->read_buffer, 104 c->read_buffer_size); 105 c->read_buffer = NULL; 106 c->read_buffer_size = 0; 107 c->read_buffer_offset = 0; 108 } 109 110 c->stop_with_error = true; 111 c->discard_request = true; 112 if ((MHD_HTTP_STATUS_CONTENT_TOO_LARGE == http_code) || 113 (MHD_HTTP_STATUS_URI_TOO_LONG == http_code) || 114 (MHD_HTTP_STATUS_REQUEST_HEADER_FIELDS_TOO_LARGE == http_code)) 115 c->rq.too_large = true; 116 117 mhd_LOG_PRINT (c->daemon, 118 MHD_SC_REQ_PROCCESSING_ERR_REPLY, 119 mhd_LOG_FMT ("Error processing request. Sending %u " \ 120 "error reply: %s"), 121 (unsigned int) http_code, 122 (NULL != msg) ? msg : "[EMPTY BODY]"); 123 124 if (NULL != c->rp.response) 125 { 126 mhd_response_dec_use_count (c->rp.response); 127 c->rp.response = NULL; 128 } 129 err_res = mhd_response_special_for_error (http_code, 130 msg_len, 131 msg, 132 add_hdr_line_len, 133 add_hdr_line); 134 if (NULL == err_res) 135 { 136 if (NULL != add_hdr_line) 137 free (add_hdr_line); 138 mhd_STREAM_ABORT (c, \ 139 mhd_CONN_CLOSE_NO_MEM_FOR_ERR_RESPONSE, \ 140 "No memory to create error response."); 141 return; 142 } 143 c->rp.response = err_res; 144 c->stage = mhd_HTTP_STAGE_START_REPLY; 145 }