respond_with_error.c (4973B)
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_NONNULL_IF_NONZERO_ (4, 3) 71 MHD_FN_PAR_NONNULL_IF_NONZERO_ (6, 5) 72 MHD_FN_PAR_CSTR_ (4) MHD_FN_PAR_CSTR_ (6) void 73 respond_with_error_len (struct MHD_Connection *c, 74 unsigned int http_code, 75 size_t msg_len, 76 const char *msg, 77 size_t add_hdr_line_len, 78 char *add_hdr_line) 79 { 80 struct MHD_Response *err_res; 81 82 mhd_assert (!c->stop_with_error); /* Do not send error twice */ 83 mhd_assert (mhd_HTTP_STAGE_REQ_RECV_FINISHED >= c->stage); 84 85 /* Discard most of the request data */ 86 87 if (NULL != c->rq.cntn.lbuf.data) 88 mhd_daemon_free_lbuf (c->daemon, &(c->rq.cntn.lbuf)); 89 c->rq.cntn.lbuf.data = NULL; 90 91 c->write_buffer = NULL; 92 c->write_buffer_size = 0; 93 c->write_buffer_send_offset = 0; 94 c->write_buffer_append_offset = 0; 95 96 mhd_DLINKEDL_INIT_LIST (&(c->rq), fields); 97 c->rq.version = NULL; 98 c->rq.method.len = 0; 99 c->rq.method.cstr = NULL; 100 c->rq.url = NULL; 101 c->continue_message_write_offset = 0; 102 if (0 != c->read_buffer_size) 103 { 104 mhd_pool_deallocate (c->pool, 105 c->read_buffer, 106 c->read_buffer_size); 107 c->read_buffer = NULL; 108 c->read_buffer_size = 0; 109 c->read_buffer_offset = 0; 110 } 111 112 c->stop_with_error = true; 113 c->discard_request = true; 114 if ((MHD_HTTP_STATUS_CONTENT_TOO_LARGE == http_code) 115 || (MHD_HTTP_STATUS_URI_TOO_LONG == http_code) 116 || (MHD_HTTP_STATUS_REQUEST_HEADER_FIELDS_TOO_LARGE == http_code)) 117 c->rq.too_large = true; 118 119 mhd_LOG_PRINT (c->daemon, 120 MHD_SC_REQ_PROCESSING_ERR_REPLY, 121 mhd_LOG_FMT ("Error processing request. Sending %u " \ 122 "error reply: %s"), 123 (unsigned int)http_code, 124 (NULL != msg) ? msg : "[EMPTY BODY]"); 125 126 if (NULL != c->rp.response) 127 { 128 mhd_response_dec_use_count (c->rp.response); 129 c->rp.response = NULL; 130 } 131 err_res = mhd_response_special_for_error (http_code, 132 msg_len, 133 msg, 134 add_hdr_line_len, 135 add_hdr_line); 136 if (NULL == err_res) 137 { 138 if (NULL != add_hdr_line) 139 free (add_hdr_line); 140 mhd_STREAM_ABORT (c, \ 141 mhd_CONN_CLOSE_NO_MEM_FOR_ERR_RESPONSE, \ 142 "No memory to create error response."); 143 return; 144 } 145 c->rp.response = err_res; 146 c->stage = mhd_HTTP_STAGE_START_REPLY; 147 }