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/*
Copyright (c) 2016, Antonio SJ Musumeci <trapexit@spawn.link>
Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "config.hpp"
#include "errno.hpp"
#include "fs_inode.hpp"
#include "fs_lstat.hpp"
#include "fs_path.hpp"
#include "fs_stat.hpp"
#include "symlinkify.hpp"
#include "ugid.hpp"
#include "fuse.h"
#include <string>
using std::string;
namespace l
{
static
void
set_stat_if_leads_to_dir(const std::string &path_,
struct stat *st_)
{
int rv;
struct stat st;
rv = fs::stat(path_,&st);
if(rv == -1)
return;
if(S_ISDIR(st.st_mode))
*st_ = st;
return;
}
static
void
set_stat_if_leads_to_reg(const std::string &path_,
struct stat *st_)
{
int rv;
struct stat st;
rv = fs::stat(path_,&st);
if(rv == -1)
return;
if(S_ISREG(st.st_mode))
*st_ = st;
return;
}
static
int
getattr_controlfile(struct stat *st_)
{
static const uid_t uid = ::getuid();
static const gid_t gid = ::getgid();
static const time_t now = ::time(NULL);
st_->st_dev = 0;
st_->st_ino = fs::inode::MAGIC;
st_->st_mode = (S_IFREG|S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH);
st_->st_nlink = 1;
st_->st_uid = uid;
st_->st_gid = gid;
st_->st_rdev = 0;
st_->st_size = 0;
st_->st_blksize = 512;
st_->st_blocks = 0;
st_->st_atime = now;
st_->st_mtime = now;
st_->st_ctime = now;
return 0;
}
static
int
getattr(const Policy::Search &searchFunc_,
const Branches &branches_,
const char *fusepath_,
struct stat *st_,
const bool symlinkify_,
const time_t symlinkify_timeout_,
FollowSymlinks followsymlinks_)
{
int rv;
string fullpath;
StrVec basepaths;
rv = searchFunc_(branches_,fusepath_,&basepaths);
if(rv == -1)
return -errno;
fullpath = fs::path::make(basepaths[0],fusepath_);
switch(followsymlinks_)
{
case FollowSymlinks::ENUM::NEVER:
rv = fs::lstat(fullpath,st_);
break;
case FollowSymlinks::ENUM::DIRECTORY:
rv = fs::lstat(fullpath,st_);
if(S_ISLNK(st_->st_mode))
l::set_stat_if_leads_to_dir(fullpath,st_);
break;
case FollowSymlinks::ENUM::REGULAR:
rv = fs::lstat(fullpath,st_);
if(S_ISLNK(st_->st_mode))
l::set_stat_if_leads_to_reg(fullpath,st_);
break;
case FollowSymlinks::ENUM::ALL:
rv = fs::stat(fullpath,st_);
if(rv != 0)
rv = fs::lstat(fullpath,st_);
break;
}
if(rv == -1)
return -errno;
if(symlinkify_ && symlinkify::can_be_symlink(*st_,symlinkify_timeout_))
symlinkify::convert(fullpath,st_);
fs::inode::calc(fusepath_,st_);
return 0;
}
int
getattr(const char *fusepath_,
struct stat *st_,
fuse_timeouts_t *timeout_)
{
int rv;
Config::Read cfg;
const fuse_context *fc = fuse_get_context();
const ugid::Set ugid(fc->uid,fc->gid);
rv = l::getattr(cfg->func.getattr.policy,
cfg->branches,
fusepath_,
st_,
cfg->symlinkify,
cfg->symlinkify_timeout,
cfg->follow_symlinks);
timeout_->entry = ((rv >= 0) ?
cfg->cache_entry :
cfg->cache_negative_entry);
timeout_->attr = cfg->cache_attr;
return rv;
}
}
namespace FUSE
{
int
getattr(const char *fusepath_,
struct stat *st_,
fuse_timeouts_t *timeout_)
{
if(fusepath_ == CONTROLFILE)
return l::getattr_controlfile(st_);
return l::getattr(fusepath_,st_,timeout_);
}
}