| /* |
| This file is part of libmicrohttpd |
| Copyright (C) 2007, 2008 Christian Grothoff (and other contributing authors) |
| Copyright (C) 2016-2022 Evgeny Grin (Karlson2k) |
| |
| This library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| This library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with this library; if not, write to the Free Software |
| Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| /** |
| * @file querystring_example.c |
| * @brief example for how to get the query string from libmicrohttpd |
| * Call with an URI ending with something like "?q=QUERY" |
| * @author Christian Grothoff |
| * @author Karlson2k (Evgeny Grin) |
| */ |
| |
| #include "platform.h" |
| #include <microhttpd.h> |
| |
| #define PAGE \ |
| "<html><head><title>libmicrohttpd demo</title></head><body>Query string for "%s" was "%s"</body></html>" |
| |
| static enum MHD_Result |
| ahc_echo (void *cls, |
| struct MHD_Connection *connection, |
| const char *url, |
| const char *method, |
| const char *version, |
| const char *upload_data, size_t *upload_data_size, void **req_cls) |
| { |
| static int aptr; |
| const char *val; |
| char *me; |
| struct MHD_Response *response; |
| enum MHD_Result ret; |
| int resp_len; |
| size_t buf_size; |
| (void) cls; /* Unused. Silent compiler warning. */ |
| (void) url; /* Unused. Silent compiler warning. */ |
| (void) version; /* Unused. Silent compiler warning. */ |
| (void) upload_data; /* Unused. Silent compiler warning. */ |
| (void) upload_data_size; /* Unused. Silent compiler warning. */ |
| |
| if (0 != strcmp (method, "GET")) |
| return MHD_NO; /* unexpected method */ |
| if (&aptr != *req_cls) |
| { |
| /* do never respond on first call */ |
| *req_cls = &aptr; |
| return MHD_YES; |
| } |
| *req_cls = NULL; /* reset when done */ |
| val = MHD_lookup_connection_value (connection, MHD_GET_ARGUMENT_KIND, "q"); |
| if (NULL == val) |
| return MHD_NO; /* No "q" argument was found */ |
| resp_len = snprintf (NULL, 0, PAGE, "q", val); |
| if (0 >= resp_len) |
| return MHD_NO; /* Error calculating response size */ |
| buf_size = (size_t) resp_len + 1; /* Add one byte for zero-termination */ |
| me = malloc (buf_size); |
| if (me == NULL) |
| return MHD_NO; /* Error allocating memory */ |
| if (resp_len != snprintf (me, buf_size, PAGE, "q", val)) |
| { |
| free (me); |
| return MHD_NO; /* Error forming the response body */ |
| } |
| response = |
| MHD_create_response_from_buffer_with_free_callback (buf_size - 1, |
| (void *) me, |
| &free); |
| if (response == NULL) |
| { |
| free (me); |
| return MHD_NO; |
| } |
| ret = MHD_queue_response (connection, MHD_HTTP_OK, response); |
| MHD_destroy_response (response); |
| return ret; |
| } |
| |
| |
| int |
| main (int argc, char *const *argv) |
| { |
| struct MHD_Daemon *d; |
| int port; |
| |
| if (argc != 2) |
| { |
| printf ("%s PORT\n", argv[0]); |
| return 1; |
| } |
| port = atoi (argv[1]); |
| if ( (port < 0) || |
| (port > UINT16_MAX) ) |
| { |
| printf ("%s PORT\n", argv[0]); |
| return 1; |
| } |
| d = MHD_start_daemon (MHD_USE_THREAD_PER_CONNECTION |
| | MHD_USE_INTERNAL_POLLING_THREAD | MHD_USE_ERROR_LOG, |
| (uint16_t) port, |
| NULL, NULL, &ahc_echo, NULL, MHD_OPTION_END); |
| if (NULL == d) |
| return 1; |
| (void) getc (stdin); |
| MHD_stop_daemon (d); |
| return 0; |
| } |
