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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_acl.hpp"
#include "fs_mknod.hpp"
#include "fs_clonepath.hpp"
#include "fs_path.hpp"
#include "ugid.hpp"
#include "fuse.h"
#include <string>
#include <vector>
using std::string;
using std::vector;
namespace error
{
static
inline
int
calc(const int rv_,
const int prev_,
const int cur_)
{
if(rv_ == -1)
{
if(prev_ == 0)
return 0;
return cur_;
}
return 0;
}
}
namespace l
{
static
inline
int
mknod_core(const string &fullpath_,
mode_t mode_,
const mode_t umask_,
const dev_t dev_)
{
if(!fs::acl::dir_has_defaults(fullpath_))
mode_ &= ~umask_;
return fs::mknod(fullpath_,mode_,dev_);
}
static
int
mknod_loop_core(const string &createpath_,
const char *fusepath_,
const mode_t mode_,
const mode_t umask_,
const dev_t dev_,
const int error_)
{
int rv;
string fullpath;
fullpath = fs::path::make(createpath_,fusepath_);
rv = l::mknod_core(fullpath,mode_,umask_,dev_);
return error::calc(rv,error_,errno);
}
static
int
mknod_loop(const string &existingpath_,
const vector<string> &createpaths_,
const char *fusepath_,
const string &fusedirpath_,
const mode_t mode_,
const mode_t umask_,
const dev_t dev_)
{
int rv;
int error;
error = -1;
for(size_t i = 0, ei = createpaths_.size(); i != ei; i++)
{
rv = fs::clonepath_as_root(existingpath_,createpaths_[i],fusedirpath_);
if(rv == -1)
error = error::calc(rv,error,errno);
else
error = l::mknod_loop_core(createpaths_[i],
fusepath_,
mode_,umask_,dev_,error);
}
return -error;
}
static
int
mknod(const Policy::Search &searchFunc_,
const Policy::Create &createFunc_,
const Branches &branches_,
const char *fusepath_,
const mode_t mode_,
const mode_t umask_,
const dev_t dev_)
{
int rv;
string fusedirpath;
vector<string> createpaths;
vector<string> existingpaths;
fusedirpath = fs::path::dirname(fusepath_);
rv = searchFunc_(branches_,fusedirpath,&existingpaths);
if(rv == -1)
return -errno;
rv = createFunc_(branches_,fusedirpath,&createpaths);
if(rv == -1)
return -errno;
return l::mknod_loop(existingpaths[0],createpaths,
fusepath_,fusedirpath,
mode_,umask_,dev_);
}
}
namespace FUSE
{
int
mknod(const char *fusepath_,
mode_t mode_,
dev_t rdev_)
{
int rv;
Config::Read cfg;
const fuse_context *fc = fuse_get_context();
const ugid::Set ugid(fc->uid,fc->gid);
rv = l::mknod(cfg->func.getattr.policy,
cfg->func.mknod.policy,
cfg->branches,
fusepath_,
mode_,
fc->umask,
rdev_);
if(rv == -EROFS)
{
Config::Write()->branches.find_and_set_mode_ro();
rv = l::mknod(cfg->func.getattr.policy,
cfg->func.mknod.policy,
cfg->branches,
fusepath_,
mode_,
fc->umask,
rdev_);
}
return rv;
}
}