libmicrohttpd demo

/* This file is part of libmicrohttpd Copyright (C) 2007, 2008 Christian Grothoff (and other contributing authors) 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 */ #include "platform.h" #include #define PAGE \ "libmicrohttpd demoQuery string for "%s" was "%s"" 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 *fmt = cls; const char *val; char *me; struct MHD_Response *response; enum MHD_Result ret; int resp_len; (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 */ if (NULL == fmt) return MHD_NO; /* The cls must not be NULL */ 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, fmt, "q", val); if (0 > resp_len) return MHD_NO; /* Error calculating response size */ me = malloc (resp_len + 1); if (me == NULL) return MHD_NO; /* Error allocating memory */ if (resp_len != snprintf (me, resp_len + 1, fmt, "q", val)) { free (me); return MHD_NO; /* Error forming the response body */ } response = MHD_create_response_from_buffer (resp_len, me, MHD_RESPMEM_MUST_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, PAGE, MHD_OPTION_END); if (NULL == d) return 1; (void) getc (stdin); MHD_stop_daemon (d); return 0; }