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httpdirfs
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successfully mounted the root directory of the server

This commit is contained in:
Fufu Fang 2018-07-22 13:35:11 +01:00
parent 631ca71834
commit 431cad8ae4
7 changed files with 142 additions and 128 deletions
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2
Makefile
View File

@ -1,5 +1,5 @@
CC=gcc
CFLAGS= -Wall -Wextra -lgumbo -lcurl -g
CFLAGS= -Wall -Wextra -lgumbo -lcurl -lfuse -D_FILE_OFFSET_BITS=64 -g
OBJ = main.o network.o
%.o: %.c

3
data.h
View File

@ -29,6 +29,9 @@ typedef struct LinkTable LinkTable;
/** \brief link data type */
typedef struct Link Link;
/** \brief root link table */
extern LinkTable *ROOT_LINK_TBL;
struct Link {
char p_url[LINK_LEN_MAX];
char f_url[URL_LEN_MAX];

89
fuse_local.c
View File

@ -1,89 +0,0 @@
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
/* must be included before including <fuse.h> */
#define FUSE_USE_VERSION 26
#include <fuse.h>
#include "network.h"
#include "fuse_local.h"
static const char *hello_str = "Hello World!\n";
static const char *hello_path = "/hello";
static struct fuse_operations fs_oper = {
.getattr = fs_getattr,
.readdir = fs_readdir,
.open = fs_open,
.read = fs_read,
};
/** \brief return the attributes for a single file indicated by path */
static int fs_getattr(const char *path, struct stat *stbuf)
{
int res = 0;
memset(stbuf, 0, sizeof(struct stat));
if (strcmp(path, "/") == 0) {
stbuf->st_mode = S_IFDIR | 0755;
stbuf->st_nlink = 100;
} else if (strcmp(path, hello_path) == 0) {
stbuf->st_mode = S_IFREG | 0444;
stbuf->st_nlink = 100;
stbuf->st_size = strlen(hello_str);
} else
res = -ENOENT;
return res;
}
/** \brief read the directory indicated by the path*/
static int fs_readdir(const char *path, void *buf, fuse_fill_dir_t filler,
off_t offset, struct fuse_file_info *fi)
{
(void) offset;
(void) fi;
if (strcmp(path, "/") != 0)
return -ENOENT;
filler(buf, ".", NULL, 0);
filler(buf, "..", NULL, 0);
filler(buf, hello_path + 1, NULL, 0);
return 0;
}
/** \brief open a file indicated by the path */
static int fs_open(const char *path, struct fuse_file_info *fi)
{
if (strcmp(path, hello_path) != 0)
return -ENOENT;
if ((fi->flags & 3) != O_RDONLY)
return -EACCES;
return 0;
}
/** \brief read a file */
static int fs_read(const char *path, char *buf, size_t size, off_t offset,
struct fuse_file_info *fi)
{
size_t len;
(void) fi;
if(strcmp(path, hello_path) != 0)
return -ENOENT;
len = strlen(hello_str);
if (offset < len) {
if (offset + size > len)
size = len - offset;
memcpy(buf, hello_str + offset, size);
} else
size = 0;
return size;
}

6
fuse_local.h
View File

@ -1,6 +0,0 @@
#ifndef FUSE_LOCAL_H
#define FUSE_LOCAL_H
#endif

135
main.c
View File

@ -1,33 +1,128 @@
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "network.h"
void link_test()
{
printf("--- start of link_test ---\n");
LinkTable_print(ROOT_LINK_TBL);
Link *link = path_to_Link("6/6.txt", ROOT_LINK_TBL);
Link_download(link, 1, 20);
printf("downloaded content:\n");
printf(link->body);
printf("\n--- end of link_test ---\n\n");
/* must be included before including <fuse.h> */
#define FUSE_USE_VERSION 26
#include <fuse.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
static int fs_getattr(const char *path, struct stat *stbuf);
static int fs_readdir(const char *path, void *buf, fuse_fill_dir_t filler,
off_t offset, struct fuse_file_info *fi);
static int fs_open(const char *path, struct fuse_file_info *fi);
static int fs_read(const char *path, char *buf, size_t size, off_t offset,
struct fuse_file_info *fi);
static struct fuse_operations fs_oper = {
.getattr = fs_getattr,
.readdir = fs_readdir,
.open = fs_open,
.read = fs_read,
};
int main(int argc, char **argv) {
network_init(argv[1]);
return fuse_main(argc - 1, argv + 1, &fs_oper, NULL);
}
void init()
/** \brief return the attributes for a single file indicated by path */
static int fs_getattr(const char *path, struct stat *stbuf)
{
network_init("http://127.0.0.1/~fangfufu/");
int res = 0;
memset(stbuf, 0, sizeof(struct stat));
if (!strcmp(path, "/")) {
stbuf->st_mode = S_IFDIR | 0755;
stbuf->st_nlink = 1;
} else {
Link *link = path_to_Link(path);
if (!link) {
return -ENOENT;
}
switch (link->type) {
case LINK_DIR:
stbuf->st_mode = S_IFDIR | 0755;
stbuf->st_nlink = 1;
break;
case LINK_FILE:
stbuf->st_mode = S_IFREG | 0444;
stbuf->st_nlink = 1;
stbuf->st_size = link->content_length;
break;
default:
return -ENOENT;
}
}
return res;
}
int main(int argc, char** argv)
/** \brief read the directory indicated by the path*/
static int fs_readdir(const char *path, void *buf, fuse_fill_dir_t dir_add,
off_t offset, struct fuse_file_info *fi)
{
(void) argc;
(void) argv;
(void) offset;
(void) fi;
init();
Link *link;
LinkTable *linktbl;
link_test();
if (!strcmp(path, "/")) {
linktbl = ROOT_LINK_TBL;
} else {
link = path_to_Link(path);
if (!link) {
return -ENOENT;
}
linktbl = link->next_table;
if (!linktbl) {
return -ENOENT;
}
}
/* start adding the links */
dir_add(buf, ".", NULL, 0);
dir_add(buf, "..", NULL, 0);
for (int i = 1; i < linktbl->num; i++) {
link = linktbl->links[i];
dir_add(buf, link->p_url, NULL, 0);
}
return 0;
}
/** \brief open a file indicated by the path */
static int fs_open(const char *path, struct fuse_file_info *fi)
{
if (!path_to_Link(path)) {
return -ENOENT;
}
if ((fi->flags & 3) != O_RDONLY) {
return -EACCES;
}
return 0;
}
/** \brief read a file */
static int fs_read(const char *path, char *buf, size_t size, off_t offset,
struct fuse_file_info *fi)
{
(void) fi;
Link *link;
link = path_to_Link(path);
if (!link) {
return -ENOENT;
}
int bytes_downloaded = Link_download(link, offset, size);
memcpy(buf, link->body, bytes_downloaded);
return bytes_downloaded;
}

23
network.c
View File

@ -200,8 +200,10 @@ static void Link_free(Link *link)
link = NULL;
}
int Link_download(Link *link, size_t start, size_t end)
size_t Link_download(Link *link, off_t offset, size_t size)
{
size_t start = offset;
size_t end = start + size;
CURL *curl = link->curl;
char range_str[64];
snprintf(range_str, sizeof(range_str), "%lu-%lu", start, end);
@ -212,7 +214,16 @@ int Link_download(Link *link, size_t start, size_t end)
long http_resp;
curl_easy_getinfo(link->curl, CURLINFO_RESPONSE_CODE, &http_resp);
return http_resp;
if (http_resp != HTTP_OK) {
fprintf(stderr, "Link_download(): Could not download %s, HTTP %ld",
link->f_url, http_resp);
return 0;
}
double dl;
curl_easy_getinfo(curl, CURLINFO_SIZE_DOWNLOAD, &dl);
size_t s = dl;
return s;
}
static LinkTable *LinkTable_new(const char *url)
@ -233,7 +244,7 @@ static LinkTable *LinkTable_new(const char *url)
curl_easy_getinfo(head_link->curl, CURLINFO_RESPONSE_CODE, &http_resp);
if (http_resp != HTTP_OK) {
fprintf(stderr, "link.c: LinkTable_new() cannot retrive the base URL, \
URL: %s, HTTP response: %ld\n", url, http_resp);
URL: %s, HTTP %ld\n", url, http_resp);
LinkTable_free(linktbl);
linktbl = NULL;
return linktbl;
@ -404,7 +415,7 @@ static Link *path_to_Link_recursive(char *path, LinkTable *linktbl)
if (!(next_table)) {
next_table = LinkTable_new(linktbl->links[i]->f_url);
}
return path_to_Link(next_path, next_table);
return path_to_Link_recursive(next_path, next_table);
}
}
}
@ -412,10 +423,10 @@ static Link *path_to_Link_recursive(char *path, LinkTable *linktbl)
return NULL;
}
Link *path_to_Link(const char *path, LinkTable *linktbl)
Link *path_to_Link(const char *path)
{
char *new_path = strndup(path, URL_LEN_MAX);
return path_to_Link_recursive(new_path, linktbl);
return path_to_Link_recursive(new_path, ROOT_LINK_TBL);
}

12
network.h
View File

@ -5,19 +5,19 @@
#include <gumbo.h>
/** \brief root link table */
extern LinkTable *ROOT_LINK_TBL;
/** \brief Initialise the network module */
void network_init(const char *url);
/** \brief download a link */
int Link_download(Link *link, size_t start, size_t end);
/**
* \brief download a link */
/* \return the number of bytes downloaded
*/
size_t Link_download(Link *link, off_t offset, size_t size);
/** \brief print a LinkTable */
void LinkTable_print(LinkTable *linktbl);
/** \brief find the link associated with a path */
Link *path_to_Link(const char *path, LinkTable *linktbl);
Link *path_to_Link(const char *path);
#endif