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#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <stdlib.h>
#include <pthread.h>
#include <fuse.h>
#include "cJSON/cJSON.h"
#include "cJSON/cJSON.c"
#include "base64/base64.h"
#include "base64/base64.c"
#include "common.h"
#include "ws.h"
static cJSON *send_request_then_await_response(cJSON *req) {
// Will be freed at receiver (ws.c, receive_tabfs_request_then_send_to_browser).
char *request_data = cJSON_Print(req);
common_send_tabfs_to_ws(request_data);
char *response_data = common_receive_ws_to_tabfs();
if (response_data == NULL) {
// Connection is dead.
return cJSON_Parse("{ \"error\": 5 }");
}
cJSON *resp = cJSON_Parse((const char *) response_data);
// Was allocated by sender (ws.c, websocket_frame).
free(response_data);
return resp;
}
#define MAKE_REQ(OP, REQ_BUILDER_BODY, RESP_HANDLER_BODY) \
do { \
int ret = -1; \
cJSON *req = NULL; \
cJSON *resp = NULL; \
\
req = cJSON_CreateObject(); \
cJSON_AddStringToObject(req, "op", OP); \
REQ_BUILDER_BODY \
\
resp = send_request_then_await_response(req); \
\
cJSON *error_item = cJSON_GetObjectItemCaseSensitive(resp, "error"); \
if (error_item) { \
ret = -error_item->valueint; \
if (ret != 0) goto done; \
} \
\
ret = -1; \
RESP_HANDLER_BODY \
\
done: \
if (req != NULL) cJSON_Delete(req); \
if (resp != NULL) cJSON_Delete(resp); \
return ret; \
} while (0)
#define JSON_GET_PROP_INT(LVALUE, KEY) \
do { \
LVALUE = cJSON_GetObjectItemCaseSensitive(resp, KEY)->valueint; \
} while (0)
static int tabfs_getattr(const char *path, struct stat *stbuf) {
memset(stbuf, 0, sizeof(struct stat));
MAKE_REQ("getattr", {
cJSON_AddStringToObject(req, "path", path);
}, {
JSON_GET_PROP_INT(stbuf->st_mode, "st_mode");
JSON_GET_PROP_INT(stbuf->st_nlink, "st_nlink");
JSON_GET_PROP_INT(stbuf->st_size, "st_size");
ret = 0;
});
}
static int tabfs_readlink(const char *path, char *buf, size_t size) {
MAKE_REQ("readlink", {
cJSON_AddStringToObject(req, "path", path);
}, {
cJSON *resp_buf_item = cJSON_GetObjectItemCaseSensitive(resp, "buf");
// FIXME: fix
char *resp_buf = cJSON_GetStringValue(resp_buf_item);
size_t resp_buf_len = strlen(resp_buf);
size = resp_buf_len < size ? resp_buf_len : size;
memcpy(buf, resp_buf, size);
ret = size;
});
}
static int tabfs_open(const char *path, struct fuse_file_info *fi) {
MAKE_REQ("open", {
cJSON_AddStringToObject(req, "path", path);
cJSON_AddNumberToObject(req, "flags", fi->flags);
}, {
cJSON *fh_item = cJSON_GetObjectItemCaseSensitive(resp, "fh");
if (fh_item) fi->fh = fh_item->valueint;
ret = 0;
});
}
static int
tabfs_read(const char *path, char *buf, size_t size, off_t offset,
struct fuse_file_info *fi) {
MAKE_REQ("read", {
cJSON_AddStringToObject(req, "path", path);
cJSON_AddNumberToObject(req, "size", size);
cJSON_AddNumberToObject(req, "offset", offset);
cJSON_AddNumberToObject(req, "fh", fi->fh);
cJSON_AddNumberToObject(req, "flags", fi->flags);
}, {
cJSON *resp_buf_item = cJSON_GetObjectItemCaseSensitive(resp, "buf");
if (!resp_buf_item) return -EIO;
char *resp_buf = cJSON_GetStringValue(resp_buf_item);
if (!resp_buf) return -EIO;
size_t resp_buf_len = strlen(resp_buf);
cJSON *base64_encoded_item = cJSON_GetObjectItemCaseSensitive(resp, "base64Encoded");
if (base64_encoded_item && cJSON_IsTrue(base64_encoded_item)) {
size = base64_decode(resp_buf, resp_buf_len, (unsigned char *) buf);
} else {
size = resp_buf_len < size ? resp_buf_len : size;
memcpy(buf, resp_buf, size);
}
ret = size;
});
}
static int tabfs_release(const char *path, struct fuse_file_info *fi) {
MAKE_REQ("release", {
cJSON_AddStringToObject(req, "path", path);
cJSON_AddNumberToObject(req, "fh", fi->fh);
}, {
ret = 0;
});
}
static int tabfs_opendir(const char *path, struct fuse_file_info *fi) {
MAKE_REQ("opendir", {
cJSON_AddStringToObject(req, "path", path);
cJSON_AddNumberToObject(req, "flags", fi->flags);
}, {
cJSON *fh_item = cJSON_GetObjectItemCaseSensitive(resp, "fh");
if (fh_item) fi->fh = fh_item->valueint;
ret = 0;
});
}
static int
tabfs_readdir(const char *path, void *buf, fuse_fill_dir_t filler,
off_t offset, struct fuse_file_info *fi) {
MAKE_REQ("readdir", {
cJSON_AddStringToObject(req, "path", path);
}, {
cJSON *entries = cJSON_GetObjectItemCaseSensitive(resp, "entries");
cJSON *entry;
cJSON_ArrayForEach(entry, entries) {
filler(buf, cJSON_GetStringValue(entry), NULL, 0);
}
ret = 0;
});
}
static int
tabfs_releasedir(const char *path, struct fuse_file_info *fi) {
MAKE_REQ("releasedir", {
cJSON_AddStringToObject(req, "path", path);
cJSON_AddNumberToObject(req, "fh", fi->fh);
}, {
ret = 0;
});
}
static struct fuse_operations tabfs_filesystem_operations = {
.getattr = tabfs_getattr, /* To provide size, permissions, etc. */
.readlink = tabfs_readlink,
.open = tabfs_open, /* To enforce read-only access. */
.read = tabfs_read, /* To provide file content. */
.release = tabfs_release,
.opendir = tabfs_opendir,
.readdir = tabfs_readdir, /* To provide directory listing. */
.releasedir = tabfs_releasedir
};
int
main(int argc, char **argv)
{
common_init();
pthread_t websocket_thread;
pthread_create(&websocket_thread, NULL, websocket_main, NULL);
return fuse_main(argc, argv, &tabfs_filesystem_operations, NULL);
}
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