170 lines
4.0 KiB
C
170 lines
4.0 KiB
C
#include "network.h"
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/* must be included before including <fuse.h> */
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#define FUSE_USE_VERSION 26
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#include <fuse.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <string.h>
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static char *BASE_URL;
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static void fs_usage();
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static void *fs_init(struct fuse_conn_info *conn);
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static int fs_getattr(const char *path, struct stat *stbuf);
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static int fs_readdir(const char *path, void *buf, fuse_fill_dir_t filler,
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off_t offset, struct fuse_file_info *fi);
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static int fs_open(const char *path, struct fuse_file_info *fi);
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static int fs_read(const char *path, char *buf, size_t size, off_t offset,
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struct fuse_file_info *fi);
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static struct fuse_operations fs_oper = {
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.getattr = fs_getattr,
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.readdir = fs_readdir,
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.open = fs_open,
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.read = fs_read,
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.init = fs_init
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};
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int main(int argc, char **argv) {
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/*
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* Copied from:
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* https://www.cs.nmsu.edu/~pfeiffer/fuse-tutorial/src/bbfs.c
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*/
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if ((argc < 3) || (argv[argc-2][0] == '-') || (argv[argc-1][0] == '-')) {
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fs_usage();
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}
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BASE_URL = argv[argc-2];
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argv[argc-2] = argv[argc-1];
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argv[argc-1] = NULL;
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argc--;
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return fuse_main(argc, argv, &fs_oper, NULL);
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}
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static void fs_usage()
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{
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fprintf(stderr,
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"usage: mount-http-dir [options] URL mount_point\n");
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abort();
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}
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static void *fs_init(struct fuse_conn_info *conn)
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{
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(void) conn;
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network_init(BASE_URL);
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return NULL;
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}
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/** \brief return the attributes for a single file indicated by path */
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static int fs_getattr(const char *path, struct stat *stbuf)
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{
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int res = 0;
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memset(stbuf, 0, sizeof(struct stat));
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if (!strcmp(path, "/")) {
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stbuf->st_mode = S_IFDIR | 0755;
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stbuf->st_nlink = 1;
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} else {
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Link *link = path_to_Link(path);
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if (!link) {
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return -ENOENT;
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}
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switch (link->type) {
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case LINK_DIR:
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stbuf->st_mode = S_IFDIR | 0755;
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stbuf->st_nlink = 1;
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break;
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case LINK_FILE:
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stbuf->st_mode = S_IFREG | 0444;
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stbuf->st_nlink = 1;
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stbuf->st_size = link->content_length;
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break;
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default:
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return -ENOENT;
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}
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}
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return res;
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}
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/** \brief read the directory indicated by the path*/
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static int fs_readdir(const char *path, void *buf, fuse_fill_dir_t dir_add,
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off_t offset, struct fuse_file_info *fi)
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{
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(void) offset;
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(void) fi;
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Link *link;
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LinkTable *linktbl;
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if (!strcmp(path, "/")) {
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linktbl = ROOT_LINK_TBL;
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} else {
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link = path_to_Link(path);
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if (!link) {
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return -ENOENT;
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}
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linktbl = link->next_table;
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if (!linktbl) {
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#ifdef HTTPDIRFS_DEBUG
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fprintf(stderr, "LinkTable_new(): %s\n", link->f_url);
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#endif
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linktbl = LinkTable_new(link->f_url);
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if(!linktbl) {
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return -ENOENT;
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}
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}
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}
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/* start adding the links */
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dir_add(buf, ".", NULL, 0);
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dir_add(buf, "..", NULL, 0);
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for (int i = 1; i < linktbl->num; i++) {
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link = linktbl->links[i];
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dir_add(buf, link->p_url, NULL, 0);
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}
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return 0;
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}
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/** \brief open a file indicated by the path */
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static int fs_open(const char *path, struct fuse_file_info *fi)
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{
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if (!path_to_Link(path)) {
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return -ENOENT;
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}
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if ((fi->flags & 3) != O_RDONLY) {
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return -EACCES;
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}
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return 0;
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}
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/** \brief read a file */
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static int fs_read(const char *path, char *buf, size_t size, off_t offset,
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struct fuse_file_info *fi)
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{
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(void) fi;
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#ifdef HTTPDIRFS_DEBUG
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fprintf(stderr, "fs_read(): path: %s, offset: %ld, size: %lu\n",
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path, offset, size);
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#endif
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long received = Link_download(path, buf, size, offset);
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#ifdef HTTPDIRFS_DEBUG
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fprintf(stderr, "fs_read(): received %ld bytes.\n", received);
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#endif
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return received;
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}
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