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/* This file is part of libmicrohttpd Copyright (C) 2007 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 fileserver_example.c * @brief minimal example for how to use libmicrohttpd to serve files * @author Christian Grothoff */ #include "platform.h" #include #ifdef HAVE_UNISTD_H #include #endif /* HAVE_UNISTD_H */ #ifdef HAVE_SYS_STAT_H #include #endif /* HAVE_SYS_STAT_H */ #ifdef HAVE_FCNTL_H #include #endif /* HAVE_FCNTL_H */ #define PAGE "File not foundFile not found" #ifndef S_ISREG #define S_ISREG(x) (S_IFREG == (x & S_IFREG)) #endif /* S_ISREG */ 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) { static int aptr; struct MHD_Response *response; int ret; int fd; struct stat buf; (void)cls; /* 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, MHD_HTTP_METHOD_GET)) && (0 != strcmp (method, MHD_HTTP_METHOD_HEAD)) ) return MHD_NO; /* unexpected method */ if (&aptr != *ptr) { /* do never respond on first call */ *ptr = &aptr; return MHD_YES; } *ptr = NULL; /* reset when done */ /* WARNING: direct usage of url as filename is for example only! * NEVER pass received data directly as parameter to file manipulation * functions. Always check validity of data before using. */ if (NULL != strstr(url, "../")) /* Very simplified check! */ fd = -1; /* Do not allow usage of parent directories. */ else fd = open (url + 1, O_RDONLY); if (-1 != fd) { if ( (0 != fstat (fd, &buf)) || (! S_ISREG (buf.st_mode)) ) { /* not a regular file, refuse to serve */ if (0 != close (fd)) abort (); fd = -1; } } if (-1 == fd) { response = MHD_create_response_from_buffer (strlen (PAGE), (void *) PAGE, MHD_RESPMEM_PERSISTENT); ret = MHD_queue_response (connection, MHD_HTTP_NOT_FOUND, response); MHD_destroy_response (response); } else { response = MHD_create_response_from_fd64 (buf.st_size, fd); if (NULL == response) { if (0 != close (fd)) abort (); 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; if (argc != 2) { 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, atoi (argv[1]), NULL, NULL, &ahc_echo, PAGE, MHD_OPTION_END); if (d == NULL) return 1; (void) getc (stdin); MHD_stop_daemon (d); return 0; }