mirror of
https://github.com/lwip-tcpip/lwip.git
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325 lines
9.6 KiB
C
325 lines
9.6 KiB
C
/**
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* @file
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* HTTPD custom file system example
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*
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* This file demonstrates how to add support for an external file system to httpd.
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* It provides access to the specified root directory and uses stdio.h file functions
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* to read files.
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*
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* ATTENTION: This implementation is *not* secure: no checks are added to ensure
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* files are only read below the specified root directory!
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*/
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/*
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* Copyright (c) 2017 Simon Goldschmidt
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* This file is part of the lwIP TCP/IP stack.
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*
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* Author: Simon Goldschmidt <goldsimon@gmx.de>
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*
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*/
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#include "lwip/opt.h"
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#include "fs_example.h"
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#include "lwip/apps/fs.h"
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#include "lwip/def.h"
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#include "lwip/mem.h"
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#include <stdio.h>
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#include <string.h>
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/** define LWIP_HTTPD_EXAMPLE_CUSTOMFILES to 1 to enable this file system */
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#ifndef LWIP_HTTPD_EXAMPLE_CUSTOMFILES
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#define LWIP_HTTPD_EXAMPLE_CUSTOMFILES 0
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#endif
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/** define LWIP_HTTPD_EXAMPLE_CUSTOMFILES_DELAYED to 1 to delay open and read
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* as if e.g. reading from external SPI flash */
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#ifndef LWIP_HTTPD_EXAMPLE_CUSTOMFILES_DELAYED
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#define LWIP_HTTPD_EXAMPLE_CUSTOMFILES_DELAYED 1
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#endif
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/** define LWIP_HTTPD_EXAMPLE_CUSTOMFILES_LIMIT_READ to the number of bytes
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* to read to emulate limited transfer buffers and don't read whole files in
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* one chunk.
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* WARNING: lowering this slows down the connection!
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*/
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#ifndef LWIP_HTTPD_EXAMPLE_CUSTOMFILES_LIMIT_READ
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#define LWIP_HTTPD_EXAMPLE_CUSTOMFILES_LIMIT_READ 0
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#endif
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#if LWIP_HTTPD_EXAMPLE_CUSTOMFILES
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#if !LWIP_HTTPD_CUSTOM_FILES
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#error This needs LWIP_HTTPD_CUSTOM_FILES
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#endif
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#if !LWIP_HTTPD_DYNAMIC_HEADERS
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#error This needs LWIP_HTTPD_DYNAMIC_HEADERS
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#endif
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#if !LWIP_HTTPD_DYNAMIC_FILE_READ
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#error This wants to demonstrate read-after-open, so LWIP_HTTPD_DYNAMIC_FILE_READ is required!
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#endif
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#if !LWIP_HTTPD_FS_ASYNC_READ
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#error This needs LWIP_HTTPD_FS_ASYNC_READ
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#endif
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#if !LWIP_HTTPD_FILE_EXTENSION
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#error This needs LWIP_HTTPD_FILE_EXTENSION
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#endif
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#if LWIP_HTTPD_EXAMPLE_CUSTOMFILES_DELAYED
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#include "lwip/tcpip.h"
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#endif
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struct fs_custom_data {
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FILE *f;
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#if LWIP_HTTPD_EXAMPLE_CUSTOMFILES_DELAYED
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int delay_read;
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fs_wait_cb callback_fn;
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void *callback_arg;
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#endif
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};
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const char* fs_ex_root_dir;
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void
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fs_ex_init(const char *httpd_root_dir)
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{
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fs_ex_root_dir = strdup(httpd_root_dir);
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}
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#if LWIP_HTTPD_CUSTOM_FILES
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int
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fs_open_custom(struct fs_file *file, const char *name)
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{
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char full_filename[256];
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FILE *f;
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snprintf(full_filename, 255, "%s%s", fs_ex_root_dir, name);
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full_filename[255] = 0;
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f = fopen(full_filename, "rb");
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if (f != NULL) {
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if (!fseek(f, 0, SEEK_END)) {
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int len = (int)ftell(f);
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if(!fseek(f, 0, SEEK_SET)) {
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struct fs_custom_data *data = (struct fs_custom_data *)mem_malloc(sizeof(struct fs_custom_data));
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LWIP_ASSERT("out of memory?", data != NULL);
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memset(file, 0, sizeof(struct fs_file));
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#if LWIP_HTTPD_EXAMPLE_CUSTOMFILES_DELAYED
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file->len = 0; /* read size delayed */
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data->delay_read = 3;
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LWIP_UNUSED_ARG(len);
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#else
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file->len = len;
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#endif
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file->flags = FS_FILE_FLAGS_HEADER_PERSISTENT;
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data->f = f;
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file->pextension = data;
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return 1;
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}
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}
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fclose(f);
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}
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return 0;
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}
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void
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fs_close_custom(struct fs_file *file)
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{
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if (file && file->pextension) {
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struct fs_custom_data *data = (struct fs_custom_data *)file->pextension;
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if (data->f != NULL) {
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fclose(data->f);
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data->f = NULL;
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}
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mem_free(data);
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}
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}
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#if LWIP_HTTPD_FS_ASYNC_READ
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u8_t
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fs_canread_custom(struct fs_file *file)
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{
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/* This function is only necessary for asynchronous I/O:
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If reading would block, return 0 and implement fs_wait_read_custom() to call the
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supplied callback if reading works. */
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#if LWIP_HTTPD_EXAMPLE_CUSTOMFILES_DELAYED
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struct fs_custom_data *data;
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LWIP_ASSERT("file != NULL", file != NULL);
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data = (struct fs_custom_data *)file->pextension;
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if (data == NULL) {
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/* file transfer has been completed already */
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LWIP_ASSERT("transfer complete", file->index == file->len);
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return 1;
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}
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LWIP_ASSERT("data != NULL", data != NULL);
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/* This just simulates a simple delay. This delay would normally come e.g. from SPI transfer */
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if (data->delay_read == 3) {
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/* delayed file size mode */
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data->delay_read = 1;
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LWIP_ASSERT("", file->len == 0);
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if (!fseek(data->f, 0, SEEK_END)) {
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int len = (int)ftell(data->f);
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if(!fseek(data->f, 0, SEEK_SET)) {
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file->len = len; /* read size delayed */
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data->delay_read = 1;
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return 0;
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}
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}
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/* if we come here, something is wrong with the file */
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LWIP_ASSERT("file error", 0);
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}
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if (data->delay_read == 1) {
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/* tell read function to delay further */
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}
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#endif
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LWIP_UNUSED_ARG(file);
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return 1;
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}
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#if LWIP_HTTPD_EXAMPLE_CUSTOMFILES_DELAYED
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static void
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fs_example_read_cb(void *arg)
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{
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struct fs_custom_data *data = (struct fs_custom_data *)arg;
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fs_wait_cb callback_fn = data->callback_fn;
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void *callback_arg = data->callback_arg;
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data->callback_fn = NULL;
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data->callback_arg = NULL;
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LWIP_ASSERT("no callback_fn", callback_fn != NULL);
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callback_fn(callback_arg);
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}
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#endif
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u8_t
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fs_wait_read_custom(struct fs_file *file, fs_wait_cb callback_fn, void *callback_arg)
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{
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#if LWIP_HTTPD_EXAMPLE_CUSTOMFILES_DELAYED
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err_t err;
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struct fs_custom_data *data = (struct fs_custom_data *)file->pextension;
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LWIP_ASSERT("data not set", data != NULL);
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data->callback_fn = callback_fn;
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data->callback_arg = callback_arg;
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err = tcpip_try_callback(fs_example_read_cb, data);
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LWIP_ASSERT("out of queue elements?", err == ERR_OK);
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LWIP_UNUSED_ARG(err);
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#else
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LWIP_ASSERT("not implemented in this example configuration", 0);
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#endif
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LWIP_UNUSED_ARG(file);
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LWIP_UNUSED_ARG(callback_fn);
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LWIP_UNUSED_ARG(callback_arg);
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/* Return
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- 0 if ready to read (at least one byte)
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- 1 if reading should be delayed (call 'tcpip_callback(callback_fn, callback_arg)' when ready) */
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return 1;
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}
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int
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fs_read_async_custom(struct fs_file *file, char *buffer, int count, fs_wait_cb callback_fn, void *callback_arg)
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{
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struct fs_custom_data *data = (struct fs_custom_data *)file->pextension;
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FILE *f;
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int len;
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int read_count = count;
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LWIP_ASSERT("data not set", data != NULL);
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#if LWIP_HTTPD_EXAMPLE_CUSTOMFILES_DELAYED
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/* This just simulates a delay. This delay would normally come e.g. from SPI transfer */
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LWIP_ASSERT("invalid state", data->delay_read >= 0 && data->delay_read <= 2);
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if (data->delay_read == 2) {
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/* no delay next time */
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data->delay_read = 0;
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return FS_READ_DELAYED;
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} else if (data->delay_read == 1) {
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err_t err;
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/* execute requested delay */
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data->delay_read = 2;
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LWIP_ASSERT("duplicate callback request", data->callback_fn == NULL);
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data->callback_fn = callback_fn;
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data->callback_arg = callback_arg;
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err = tcpip_try_callback(fs_example_read_cb, data);
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LWIP_ASSERT("out of queue elements?", err == ERR_OK);
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LWIP_UNUSED_ARG(err);
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return FS_READ_DELAYED;
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}
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/* execute this read but delay the next one */
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data->delay_read = 1;
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#endif
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#if LWIP_HTTPD_EXAMPLE_CUSTOMFILES_LIMIT_READ
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read_count = LWIP_MIN(read_count, LWIP_HTTPD_EXAMPLE_CUSTOMFILES_LIMIT_READ);
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#endif
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f = data->f;
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len = (int)fread(buffer, 1, read_count, f);
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LWIP_UNUSED_ARG(callback_fn);
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LWIP_UNUSED_ARG(callback_arg);
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file->index += len;
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/* Return
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- FS_READ_EOF if all bytes have been read
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- FS_READ_DELAYED if reading is delayed (call 'tcpip_callback(callback_fn, callback_arg)' when done) */
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if (len == 0) {
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/* all bytes read already */
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return FS_READ_EOF;
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}
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return len;
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}
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#else /* LWIP_HTTPD_FS_ASYNC_READ */
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int
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fs_read_custom(struct fs_file *file, char *buffer, int count)
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{
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struct fs_custom_data *data = (struct fs_custom_data *)file->pextension;
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FILE *f;
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int len;
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int read_count = count;
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LWIP_ASSERT("data not set", data != NULL);
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#if LWIP_HTTPD_EXAMPLE_CUSTOMFILES_LIMIT_READ
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read_count = LWIP_MIN(read_count, LWIP_HTTPD_EXAMPLE_CUSTOMFILES_LIMIT_READ);
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#endif
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f = data->f;
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len = (int)fread(buffer, 1, read_count, f);
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file->index += len;
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/* Return FS_READ_EOF if all bytes have been read */
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return len;
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}
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#endif /* LWIP_HTTPD_FS_ASYNC_READ */
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#endif /* LWIP_HTTPD_CUSTOM_FILES */
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#endif /* LWIP_HTTPD_EXAMPLE_CUSTOMFILES */
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