1 /*
2 This file is part of libmicrohttpd
3 Copyright (C) 2007, 2008 Christian Grothoff (and other contributing authors)
4
5 This library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 This library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with this library; if not, write to the Free Software
17 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18 */
19 /**
20 * @file querystring_example.c
21 * @brief example for how to get the query string from libmicrohttpd
22 * Call with an URI ending with something like "?q=QUERY"
23 * @author Christian Grothoff
24 */
25
26 #include "platform.h"
27 #include <microhttpd.h>
28
29 #define PAGE "<html><head><title>libmicrohttpd demo</title></head><body>Query string for "%s" was "%s"</body></html>"
30
31 static int
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 ** ptr)32 ahc_echo (void *cls,
33 struct MHD_Connection *connection,
34 const char *url,
35 const char *method,
36 const char *version,
37 const char *upload_data, size_t *upload_data_size, void **ptr)
38 {
39 static int aptr;
40 const char *fmt = cls;
41 const char *val;
42 char *me;
43 struct MHD_Response *response;
44 int ret;
45
46 if (0 != strcmp (method, "GET"))
47 return MHD_NO; /* unexpected method */
48 if (&aptr != *ptr)
49 {
50 /* do never respond on first call */
51 *ptr = &aptr;
52 return MHD_YES;
53 }
54 *ptr = NULL; /* reset when done */
55 val = MHD_lookup_connection_value (connection, MHD_GET_ARGUMENT_KIND, "q");
56 me = malloc (snprintf (NULL, 0, fmt, "q", val) + 1);
57 if (me == NULL)
58 return MHD_NO;
59 sprintf (me, fmt, "q", val);
60 response = MHD_create_response_from_buffer (strlen (me), me,
61 MHD_RESPMEM_MUST_FREE);
62 if (response == NULL)
63 {
64 free (me);
65 return MHD_NO;
66 }
67 ret = MHD_queue_response (connection, MHD_HTTP_OK, response);
68 MHD_destroy_response (response);
69 return ret;
70 }
71
72 int
main(int argc,char * const * argv)73 main (int argc, char *const *argv)
74 {
75 struct MHD_Daemon *d;
76
77 if (argc != 2)
78 {
79 printf ("%s PORT\n", argv[0]);
80 return 1;
81 }
82 d = MHD_start_daemon (MHD_USE_THREAD_PER_CONNECTION | MHD_USE_DEBUG,
83 atoi (argv[1]),
84 NULL, NULL, &ahc_echo, PAGE, MHD_OPTION_END);
85 if (d == NULL)
86 return 1;
87 (void) getc (stdin);
88 MHD_stop_daemon (d);
89 return 0;
90 }
91