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/* This file is part of libmicrohttpd Copyright (C) 2007, 2008 Christian Grothoff (and other contributing authors) Copyright (C) 2014-2022 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 fileserver_example_external_select.c * @brief minimal example for how to use libmicrohttpd to server files * @author Christian Grothoff * @author Karlson2k (Evgeny Grin) */ #include "platform.h" #include #include #include #define PAGE \ "File not foundFile not found" static ssize_t file_reader (void *cls, uint64_t pos, char *buf, size_t max) { FILE *file = (FILE *) cls; size_t bytes_read; /* 'fseek' may not support files larger 2GiB, depending on platform. * For production code, make sure that 'pos' has valid values, supported by * 'fseek', or use 'fseeko' or similar function. */ if (0 != fseek (file, (long) pos, SEEK_SET)) return MHD_CONTENT_READER_END_WITH_ERROR; bytes_read = fread (buf, 1, max, file); if (0 == bytes_read) return (0 != ferror (file)) ? MHD_CONTENT_READER_END_WITH_ERROR : MHD_CONTENT_READER_END_OF_STREAM; return (ssize_t) bytes_read; } static void free_callback (void *cls) { FILE *file = cls; fclose (file); } 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; struct MHD_Response *response; enum MHD_Result ret; FILE *file; 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)) 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 */ file = fopen (&url[1], "rb"); if (NULL != file) { fd = fileno (file); if (-1 == fd) { (void) fclose (file); return MHD_NO; /* internal error */ } if ( (0 != fstat (fd, &buf)) || (! S_ISREG (buf.st_mode)) ) { /* not a regular file, refuse to serve */ fclose (file); file = NULL; } } if (NULL == file) { response = MHD_create_response_from_buffer_static (strlen (PAGE), PAGE); ret = MHD_queue_response (connection, MHD_HTTP_NOT_FOUND, response); MHD_destroy_response (response); } else { response = MHD_create_response_from_callback ((size_t) buf.st_size, 32 * 1024, /* 32k page size */ &file_reader, file, &free_callback); if (NULL == response) { fclose (file); 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; time_t end; time_t t; struct timeval tv; fd_set rs; fd_set ws; fd_set es; MHD_socket max; uint64_t mhd_timeout; int port; if (argc != 3) { printf ("%s PORT SECONDS-TO-RUN\n", argv[0]); return 1; } port = atoi (argv[1]); if ( (1 > port) || (port > 65535) ) { fprintf (stderr, "Port must be a number between 1 and 65535.\n"); return 1; } d = MHD_start_daemon (MHD_USE_ERROR_LOG, (uint16_t) port, NULL, NULL, &ahc_echo, NULL, MHD_OPTION_END); if (d == NULL) return 1; end = time (NULL) + atoi (argv[2]); while ((t = time (NULL)) < end) { #if ! defined(_WIN32) || defined(__CYGWIN__) tv.tv_sec = end - t; #else /* Native W32 */ tv.tv_sec = (long) (end - t); #endif /* Native W32 */ tv.tv_usec = 0; max = 0; FD_ZERO (&rs); FD_ZERO (&ws); FD_ZERO (&es); if (MHD_YES != MHD_get_fdset (d, &rs, &ws, &es, &max)) break; /* fatal internal error */ if (MHD_get_timeout64 (d, &mhd_timeout) == MHD_YES) { if (((uint64_t) tv.tv_sec) < mhd_timeout / 1000LL) { #if ! defined(_WIN32) || defined(__CYGWIN__) tv.tv_sec = (time_t) (mhd_timeout / 1000LL); #else /* Native W32 */ tv.tv_sec = (long) (mhd_timeout / 1000LL); #endif /* Native W32 */ tv.tv_usec = ((long) (mhd_timeout % 1000)) * 1000; } } if (-1 == select ((int) max + 1, &rs, &ws, &es, &tv)) { if (EINTR != errno) abort (); } MHD_run (d); } MHD_stop_daemon (d); return 0; }