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501 lines
13 KiB
501 lines
13 KiB
#include "static_filesystem.h"
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#include "webfuse_provider/client_config.h"
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#include "webfuse_provider/dirbuffer.h"
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#include "webfuse_provider/operation/error.h"
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#include "path.h"
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdbool.h>
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#define STATIC_FILESYSTEM_DEFAULT_CAPACITY (16)
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#define STATIC_FILSYSTEM_INODE_ROOT (1)
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#define STATIC_FILESYSTEM_MAX_READ_SIZE (4 * 1024)
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struct static_filesystem_entry
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{
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size_t inode;
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size_t parent;
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char * name;
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bool is_file;
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int mode;
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size_t size;
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char * content;
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static_filesystem_read_fn * read;
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static_filesystem_get_info_fn * get_info;
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void * user_data;
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};
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struct static_filesystem
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{
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struct static_filesystem_entry * entries;
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size_t size;
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size_t capacity;
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};
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static struct static_filesystem_entry *
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static_filesystem_get_entry(
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struct static_filesystem * filesystem,
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size_t inode)
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{
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struct static_filesystem_entry * entry = NULL;
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if ((0 < inode) && (inode <= filesystem->size))
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{
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entry = &filesystem->entries[inode - 1];
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}
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return entry;
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}
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static struct static_filesystem_entry *
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static_filesystem_get_entry_by_name(
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struct static_filesystem * filesystem,
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size_t parent,
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char const * name)
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{
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struct static_filesystem_entry * entry = NULL;
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for(size_t i = 0; i < filesystem->size; i++)
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{
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struct static_filesystem_entry * current = &filesystem->entries[i];
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if ((parent == current->parent) && (0 == strcmp(name, current->name)))
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{
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entry = current;
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break;
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}
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}
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return entry;
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}
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static struct static_filesystem_entry *
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static_filesystem_add_entry(
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struct static_filesystem * filesystem)
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{
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struct static_filesystem_entry * entry = NULL;
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if (filesystem->size >= filesystem->capacity)
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{
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struct static_filesystem_entry * entries;
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size_t new_capacity = 2 * filesystem->capacity;
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size_t new_size = new_capacity * sizeof(struct static_filesystem_entry);
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entries = realloc(filesystem->entries, new_size);
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if (NULL != entries)
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{
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filesystem->entries = entries;
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filesystem->capacity = new_capacity;
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}
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}
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if (filesystem->size < filesystem->capacity)
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{
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entry = &filesystem->entries[filesystem->size];
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entry->inode = filesystem->size + 1;
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filesystem->size++;
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}
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return entry;
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}
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static size_t
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static_filesystem_entry_read(
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size_t offset,
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char * buffer,
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size_t buffer_size,
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void * user_data)
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{
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size_t result = 0;
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struct static_filesystem_entry * entry = user_data;
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if (offset < entry->size)
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{
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size_t remaining = (entry->size - offset);
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result = (buffer_size < remaining) ? buffer_size : remaining;
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memcpy(buffer, entry->content, result);
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}
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return result;
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}
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static void
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static_filesystem_entry_get_info(
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void * user_data,
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int * result_mode,
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size_t * result_size)
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{
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struct static_filesystem_entry * entry = user_data;
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*result_mode = entry->mode;
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*result_size = entry->size;
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}
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static size_t
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static_filesystem_file_read(
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size_t offset,
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char * buffer,
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size_t buffer_size,
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void * user_data)
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{
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size_t result = 0;
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struct static_filesystem_entry * entry = user_data;
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char const * filename = entry->content;
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FILE * file = fopen(filename, "rb");
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if (NULL != file)
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{
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fseek(file, offset, SEEK_SET);
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result = fread(buffer, buffer_size, 1, file);
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fclose(file);
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}
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return result;
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}
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static void
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static_filesystem_file_get_info(
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void * user_data,
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int * result_mode,
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size_t * result_size)
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{
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struct static_filesystem_entry * entry = user_data;
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char const * filename = entry->content;
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struct stat buffer;
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stat(filename, &buffer);
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*result_mode = (int) (buffer.st_mode & 0777);
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*result_size = (size_t) buffer.st_size;
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}
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static size_t
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static_filesystem_add_dir(
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struct static_filesystem * filesystem,
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size_t parent,
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char const * name
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)
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{
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struct static_filesystem_entry * entry = static_filesystem_get_entry_by_name(filesystem, parent, name);
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if (NULL == entry)
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{
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entry = static_filesystem_add_entry(filesystem);
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entry->parent = parent;
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entry->is_file = false;
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entry->mode = 0555;
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entry->name = strdup(name);
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entry->user_data = entry;
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entry->read = &static_filesystem_entry_read;
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entry->get_info = &static_filesystem_entry_get_info;
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entry->size = 0;
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entry->content = NULL;
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}
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return entry->inode;
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}
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static size_t
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static_filesystem_make_parent(
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struct static_filesystem * filesystem,
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struct path * path)
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{
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size_t result = STATIC_FILSYSTEM_INODE_ROOT;
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size_t count = path_element_count(path);
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if (0 < count)
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{
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for(size_t i = 0; i < (count - 1); i++)
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{
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char const * name = path_get_element(path, i);
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result = static_filesystem_add_dir(filesystem, result, name);
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}
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}
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return result;
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}
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static void
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static_filesystem_stat(
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struct static_filesystem_entry * entry,
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struct stat * stat
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)
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{
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memset(stat, 0, sizeof(struct stat));
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int mode;
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size_t size;
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entry->get_info(entry->user_data, &mode, &size);
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stat->st_ino = entry->inode;
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stat->st_size = entry->size;
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stat->st_mode = entry->mode & 0777;
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stat->st_mode |= (entry->is_file) ? S_IFREG: S_IFDIR;
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}
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static void static_filesystem_lookup(
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struct wfp_request * request,
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ino_t parent,
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char const * name,
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void * user_data)
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{
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struct static_filesystem * filesystem = user_data;
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struct static_filesystem_entry * entry = static_filesystem_get_entry_by_name(filesystem, parent, name);
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if (NULL != entry)
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{
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struct stat stat;
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static_filesystem_stat(entry, &stat);
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wfp_respond_lookup(request, &stat);
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}
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else
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{
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wfp_respond_error(request, WFP_BAD_NOENTRY);
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}
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}
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static void static_filesystem_getattr(
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struct wfp_request * request,
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ino_t inode,
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void * user_data)
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{
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struct static_filesystem * filesystem = user_data;
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struct static_filesystem_entry * entry = static_filesystem_get_entry(filesystem, inode);
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if (NULL != entry)
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{
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struct stat stat;
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static_filesystem_stat(entry, &stat);
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wfp_respond_getattr(request, &stat);
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}
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else
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{
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wfp_respond_error(request, WFP_BAD_NOENTRY);
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}
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}
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static void static_filesystem_readdir(
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struct wfp_request * request,
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ino_t directory,
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void * user_data)
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{
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struct static_filesystem * filesystem = user_data;
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struct static_filesystem_entry * dir = static_filesystem_get_entry(filesystem, directory);
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if ((NULL != dir) && (!dir->is_file))
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{
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struct wfp_dirbuffer * buffer = wfp_dirbuffer_create();
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wfp_dirbuffer_add(buffer, ".", dir->inode);
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wfp_dirbuffer_add(buffer, "..", dir->inode);
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for(size_t i = 0; i < filesystem->size; i++)
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{
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struct static_filesystem_entry const * entry = &filesystem->entries[i];
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if (directory == entry->parent)
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{
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wfp_dirbuffer_add(buffer, entry->name, entry->inode);
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}
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}
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wfp_respond_readdir(request, buffer);
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wfp_dirbuffer_dispose(buffer);
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}
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else
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{
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wfp_respond_error(request, WFP_BAD_NOENTRY);
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}
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}
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static void static_filesystem_open(
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struct wfp_request * request,
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ino_t inode,
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int flags,
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void * user_data)
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{
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struct static_filesystem * filesystem = user_data;
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struct static_filesystem_entry * entry = static_filesystem_get_entry(filesystem, inode);
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if ((NULL != entry) && (entry->is_file))
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{
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if (O_RDONLY == (flags & O_ACCMODE))
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{
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wfp_respond_open(request, 0U);
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}
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else
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{
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wfp_respond_error(request, WFP_BAD_ACCESS_DENIED);
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}
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}
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else
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{
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wfp_respond_error(request, WFP_BAD_NOENTRY);
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}
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}
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static void static_filesystem_read(
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struct wfp_request * request,
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ino_t inode,
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uint32_t handle,
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size_t offset,
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size_t length,
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void * user_data)
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{
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(void) handle;
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struct static_filesystem * filesystem = user_data;
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struct static_filesystem_entry * entry = static_filesystem_get_entry(filesystem, inode);
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if ((NULL != entry) && (entry->is_file))
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{
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char buffer[STATIC_FILESYSTEM_MAX_READ_SIZE];
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size_t max_size = (length < STATIC_FILESYSTEM_MAX_READ_SIZE) ? length : STATIC_FILESYSTEM_MAX_READ_SIZE;
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size_t count = entry->read(offset, buffer, max_size, entry->user_data);
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wfp_respond_read(request, buffer, count);
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}
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else
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{
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wfp_respond_error(request, WFP_BAD_NOENTRY);
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}
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}
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struct static_filesystem *
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static_filesystem_create(
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struct wfp_client_config * config)
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{
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(void) config;
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struct static_filesystem * filesystem = malloc(sizeof(struct static_filesystem));
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if (NULL != filesystem)
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{
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filesystem->entries = malloc(sizeof(struct static_filesystem_entry) * STATIC_FILESYSTEM_DEFAULT_CAPACITY);
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filesystem->size = 0;
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filesystem->capacity = STATIC_FILESYSTEM_DEFAULT_CAPACITY;
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static_filesystem_add_dir(filesystem, 0, "<root>");
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wfp_client_config_set_userdata(config, filesystem);
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wfp_client_config_set_onlookup(config, &static_filesystem_lookup);
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wfp_client_config_set_ongetattr(config, &static_filesystem_getattr);
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wfp_client_config_set_onreaddir(config, &static_filesystem_readdir);
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wfp_client_config_set_onopen(config, &static_filesystem_open);
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wfp_client_config_set_onread(config, &static_filesystem_read);
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}
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return filesystem;
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}
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void
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static_filesystem_dispose(
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struct static_filesystem * filesystem)
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{
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for(size_t i = 0; i < filesystem->size; i++)
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{
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struct static_filesystem_entry * entry = &filesystem->entries[i];
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free(entry->name);
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free(entry->content);
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}
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free(filesystem->entries);
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free(filesystem);
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}
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void
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static_filesystem_add(
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struct static_filesystem * filesystem,
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char const * path,
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int mode,
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char const * content,
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size_t length)
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{
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struct path * path_ = path_create(path);
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if (NULL != path_)
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{
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size_t parent = static_filesystem_make_parent(filesystem, path_);
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struct static_filesystem_entry * entry = static_filesystem_add_entry(filesystem);
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entry->parent = parent;
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entry->is_file = true;
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entry->name = strdup(path_get_filename(path_));
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entry->mode = mode;
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entry->size = length;
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entry->get_info = &static_filesystem_entry_get_info;
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entry->read = &static_filesystem_entry_read;
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entry->user_data = entry;
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entry->content = malloc(length);
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memcpy(entry->content, content, length);
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path_dispose(path_);
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}
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}
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void
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static_filesystem_add_text(
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struct static_filesystem * filesystem,
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char const * path,
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int mode,
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char const * content)
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{
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size_t length = strlen(content);
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static_filesystem_add(filesystem, path, mode, content, length);
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}
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void
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static_filesystem_add_file(
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struct static_filesystem * filesystem,
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char const * path,
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char const * filename)
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{
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struct path * path_ = path_create(path);
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if (NULL != path_)
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{
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size_t parent = static_filesystem_make_parent(filesystem, path_);
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struct static_filesystem_entry * entry = static_filesystem_add_entry(filesystem);
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entry->parent = parent;
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entry->is_file = true;
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entry->mode = 0;
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entry->content = strdup(filename);
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entry->size = 0;
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entry->name = strdup(path_get_filename(path_));
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entry->get_info = &static_filesystem_file_get_info;
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entry->read = &static_filesystem_file_read;
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entry->user_data = entry;
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path_dispose(path_);
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}
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}
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void
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static_filesystem_add_generic(
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struct static_filesystem * filesystem,
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char const * path,
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static_filesystem_read_fn * read,
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static_filesystem_get_info_fn * get_info,
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void * user_data)
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{
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struct path * path_ = path_create(path);
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if (NULL != path_)
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{
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size_t parent = static_filesystem_make_parent(filesystem, path_);
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struct static_filesystem_entry * entry = static_filesystem_add_entry(filesystem);
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entry->parent = parent;
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entry->is_file = true;
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entry->mode = 0;
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entry->content = NULL;
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entry->size = 0;
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entry->name = strdup(path_get_filename(path_));
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entry->get_info = get_info;
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entry->read = read;
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entry->user_data = user_data;
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path_dispose(path_);
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}
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}
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