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#include <sys/types.h>
#include <sys/select.h>
#include <sys/socket.h>
#include <microhttpd.h>
#define PORT 8888
#define POSTBUFFERSIZE 512
#define MAXCLIENTS 2
#define GET 0
#define POST 1
static unsigned int nr_of_uploading_clients = 0;
struct connection_info_struct
{
int connectiontype;
struct MHD_PostProcessor *postprocessor;
FILE *fp;
const char *answerstring;
int answercode;
};
const char *askpage = "<html><body>\n\
Upload a file, please!<br>\n\
There are %u clients uploading at the moment.<br>\n\
<form action=\"/filepost\" method=\"post\" enctype=\"multipart/form-data\">\n\
<input name=\"file\" type=\"file\">\n\
<input type=\"submit\" value=\" Send \"></form>\n\
</body></html>";
const char *busypage =
"<html><body>This server is busy, please try again later.</body></html>";
const char *completepage =
"<html><body>The upload has been completed.</body></html>";
const char *errorpage =
"<html><body>This doesn't seem to be right.</body></html>";
const char *servererrorpage =
"<html><body>An internal server error has occured.</body></html>";
const char *fileexistspage =
"<html><body>This file already exists.</body></html>";
static int
send_page (struct MHD_Connection *connection, const char *page,
int status_code)
{
int ret;
struct MHD_Response *response;
response =
MHD_create_response_from_buffer (strlen (page), (void *) page,
MHD_RESPMEM_PERSISTENT);
if (!response)
return MHD_NO;
ret = MHD_queue_response (connection, status_code, response);
MHD_destroy_response (response);
return ret;
}
static int
iterate_post (void *coninfo_cls, enum MHD_ValueKind kind, const char *key,
const char *filename, const char *content_type,
const char *transfer_encoding, const char *data, uint64_t off,
size_t size)
{
struct connection_info_struct *con_info = coninfo_cls;
FILE *fp;
con_info->answerstring = servererrorpage;
con_info->answercode = MHD_HTTP_INTERNAL_SERVER_ERROR;
if (0 != strcmp (key, "file"))
return MHD_NO;
if (!con_info->fp)
{
if (NULL != (fp = fopen (filename, "rb")))
{
fclose (fp);
con_info->answerstring = fileexistspage;
con_info->answercode = MHD_HTTP_FORBIDDEN;
return MHD_NO;
}
con_info->fp = fopen (filename, "ab");
if (!con_info->fp)
return MHD_NO;
}
if (size > 0)
{
if (!fwrite (data, size, sizeof (char), con_info->fp))
return MHD_NO;
}
con_info->answerstring = completepage;
con_info->answercode = MHD_HTTP_OK;
return MHD_YES;
}
static void
request_completed (void *cls, struct MHD_Connection *connection,
void **con_cls, enum MHD_RequestTerminationCode toe)
{
struct connection_info_struct *con_info = *con_cls;
if (NULL == con_info)
return;
if (con_info->connectiontype == POST)
{
if (NULL != con_info->postprocessor)
{
MHD_destroy_post_processor (con_info->postprocessor);
nr_of_uploading_clients--;
}
if (con_info->fp)
fclose (con_info->fp);
}
free (con_info);
*con_cls = NULL;
}
static int
answer_to_connection (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 **con_cls)
{
if (NULL == *con_cls)
{
struct connection_info_struct *con_info;
if (nr_of_uploading_clients >= MAXCLIENTS)
return send_page (connection, busypage, MHD_HTTP_SERVICE_UNAVAILABLE);
con_info = malloc (sizeof (struct connection_info_struct));
if (NULL == con_info)
return MHD_NO;
con_info->fp = NULL;
if (0 == strcmp (method, "POST"))
{
con_info->postprocessor =
MHD_create_post_processor (connection, POSTBUFFERSIZE,
iterate_post, (void *) con_info);
if (NULL == con_info->postprocessor)
{
free (con_info);
return MHD_NO;
}
nr_of_uploading_clients++;
con_info->connectiontype = POST;
con_info->answercode = MHD_HTTP_OK;
con_info->answerstring = completepage;
}
else
con_info->connectiontype = GET;
*con_cls = (void *) con_info;
return MHD_YES;
}
if (0 == strcmp (method, "GET"))
{
int ret;
char buffer[1024];
sprintf (buffer, askpage, nr_of_uploading_clients);
return send_page (connection, buffer, MHD_HTTP_OK);
}
if (0 == strcmp (method, "POST"))
{
struct connection_info_struct *con_info = *con_cls;
if (0 != *upload_data_size)
{
MHD_post_process (con_info->postprocessor, upload_data,
*upload_data_size);
*upload_data_size = 0;
return MHD_YES;
}
else
return send_page (connection, con_info->answerstring,
con_info->answercode);
}
return send_page (connection, errorpage, MHD_HTTP_BAD_REQUEST);
}
int
main ()
{
struct MHD_Daemon *daemon;
daemon = MHD_start_daemon (MHD_USE_SELECT_INTERNALLY, PORT, NULL, NULL,
&answer_to_connection, NULL,
MHD_OPTION_NOTIFY_COMPLETED, request_completed,
NULL, MHD_OPTION_END);
if (NULL == daemon)
return 1;
getchar ();
MHD_stop_daemon (daemon);
return 0;
}
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