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// This file should rarely need to be changed. (which is intentional,
// because it is a pain to program here, it's a pain to recompile and
// reload it, and it's a pain to debug it.) Most of the real meat of
// TabFS is on the extension side, not here.
#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <pthread.h>
#include <fuse.h>
#include "vendor/frozen.h"
#include "vendor/frozen.c"
FILE* l;
static void send_request(const char *fmt, ...) {
va_list args; va_start(args, fmt);
char request_data[1024*1024]; // max size of native->Chrome message
struct json_out out = JSON_OUT_BUF(request_data, sizeof(request_data));
unsigned int request_len = json_vprintf(&out, fmt, args);
va_end(args);
write(1, (char *) &request_len, 4); // stdout
unsigned int bytes_written = 0;
while (bytes_written < request_len) {
bytes_written += write(1, request_data, request_len);
}
/* fprintf(l, "req[%s]\n", request_data); fflush(l); */
}
static int await_response(char **resp) {
unsigned int response_len;
read(0, (char *) &response_len, 4); // stdin
char *response_data = malloc(response_len);
unsigned int bytes_read = 0;
while (bytes_read < response_len) {
bytes_read += read(0, response_data + bytes_read, response_len);
}
/* fprintf(l, "resp(%d; expected %d)[%s]\n", bytes_read, response_len, response_data); fflush(l); */
if (response_data == NULL) {
// Connection is dead.
*resp = "{ \"error\": 5 }";
return strlen(*resp);
}
*resp = response_data;
return response_len;
}
#define receive_response(fmt, ...) \
do { \
char *resp; int resp_len; \
resp_len = await_response(&resp); \
if (!resp_len) return -EIO; \
\
int err; \
if (json_scanf(resp, resp_len, "{error: %d}", &err) && err) { \
free(resp); return -err; \
} \
\
json_scanf(resp, resp_len, fmt, __VA_ARGS__); \
free(resp); \
} while (0)
static int tabfs_getattr(const char *path, struct stat *stbuf) {
send_request("{op: %Q, path: %Q}", "getattr", path);
memset(stbuf, 0, sizeof(struct stat));
receive_response("{st_mode: %d, st_nlink: %d, st_size: %d}",
&stbuf->st_mode, &stbuf->st_nlink, &stbuf->st_size);
return 0;
}
static int tabfs_readlink(const char *path, char *buf, size_t size) {
send_request("{op: %Q, path: %Q}", "readlink", path);
char *scan_buf; int scan_len;
receive_response("{buf: %V}", &scan_buf, &scan_len);
memcpy(buf, scan_buf, scan_len < size ? scan_len : size); free(scan_buf);
return 0;
}
static int tabfs_open(const char *path, struct fuse_file_info *fi) {
send_request("{op: %Q, path: %Q, flags: %d}", "open", path, fi->flags);
receive_response("{fh: %d}", &fi->fh);
return 0;
}
static int
tabfs_read(const char *path, char *buf, size_t size, off_t offset,
struct fuse_file_info *fi) {
send_request("{op: %Q, path: %Q, size: %d, offset: %d, fh: %d, flags: %d}",
"read", path, size, offset, fi->fh, fi->flags);
char *scan_buf; int scan_len;
receive_response("{buf: %V}", &scan_buf, &scan_len);
memcpy(buf, scan_buf, scan_len < size ? scan_len : size); free(scan_buf);
return scan_len;
}
static int
tabfs_write(const char *path, const char *buf, size_t size, off_t offset,
struct fuse_file_info *fi) {
send_request("{op: %Q, path: %Q, buf: %V, offset: %d, fh: %d, flags: %d}",
"write", path, buf, size, offset, fi->fh, fi->flags);
int ret; receive_response("{size: %d}", &ret); return ret;
}
static int tabfs_release(const char *path, struct fuse_file_info *fi) {
send_request("{op: %Q, path: %Q, fh: %d}",
"release", path, fi->fh);
receive_response("{}", NULL);
return 0;
}
static int tabfs_opendir(const char *path, struct fuse_file_info *fi) {
send_request("{op: %Q, path: %Q, flags: %d}",
"opendir", path, fi->flags);
receive_response("{fh: %d}", &fi->fh);
return 0;
}
static int
tabfs_readdir(const char *path, void *buf, fuse_fill_dir_t filler,
off_t offset, struct fuse_file_info *fi) {
send_request("{op: %Q, path: %Q, offset: %d}",
"readdir", path, offset);
char *resp; int resp_len;
resp_len = await_response(&resp);
if (!resp_len) return -EIO;
struct json_token t;
for (int i = 0; json_scanf_array_elem(resp, resp_len, ".entries", i, &t) > 0; i++) {
char entry[t.len + 1]; snprintf(entry, t.len + 1, "%.*s", t.len, t.ptr);
filler(buf, entry, NULL, 0);
}
free(resp);
return 0;
}
static int tabfs_releasedir(const char *path, struct fuse_file_info *fi) {
send_request("{op: %Q, path: %Q, fh: %d}",
"releasedir", path, fi->fh);
receive_response("{}", NULL);
return 0;
}
static int tabfs_truncate(const char *path, off_t size) {
send_request("{op: %Q, path: %Q, size: %d}",
"truncate", path, size);
receive_response("{}", NULL);
return 0;
}
static int tabfs_unlink(const char *path) {
send_request("{op: %Q, path: %Q}", "unlink", path);
receive_response("{}", NULL);
return 0;
}
static int tabfs_mkdir(const char *path, mode_t mode) {
send_request("{op: %Q, path: %Q, mode: %d}", "mkdir", path, mode);
receive_response("{}", NULL);
return 0;
}
static int tabfs_create(const char *path, mode_t mode, struct fuse_file_info *fi) {
send_request("{op: %Q, path: %Q, mode: %d}", "mkdir", path, mode);
receive_response("{}", NULL);
return 0;
}
static struct fuse_operations tabfs_filesystem_operations = {
.getattr = tabfs_getattr,
.readlink = tabfs_readlink,
.open = tabfs_open,
.read = tabfs_read,
.write = tabfs_write,
.release = tabfs_release,
.opendir = tabfs_opendir,
.readdir = tabfs_readdir,
.releasedir = tabfs_releasedir,
.truncate = tabfs_truncate,
.unlink = tabfs_unlink,
.mkdir = tabfs_mkdir,
.create = tabfs_create
};
int main(int argc, char **argv) {
char killcmd[1000];
sprintf(killcmd, "pgrep tabfs | grep -v %d | xargs kill -9", getpid());
system(killcmd);
#ifdef __APPLE__
system("diskutil umount force mnt > /dev/null");
#elif __FreeBSD__
system("umount -f mnt");
#else
system("fusermount -u mnt");
#endif
l = fopen("log.txt", "w");
for (int i = 0; i < argc; i++) {
fprintf(l, "arg%d: [%s]\n", i, argv[i]); fflush(l);
}
char* fuse_argv[] = {argv[0], "-odirect_io", "-s", "-f", "mnt"};
return fuse_main(5, fuse_argv, &tabfs_filesystem_operations, NULL);
}
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