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/*
Copyright (c) 2018, 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_glob.hpp"
#include "fs_lsetxattr.hpp"
#include "fs_path.hpp"
#include "fs_statvfs_cache.hpp"
#include "num.hpp"
#include "policy_rv.hpp"
#include "str.hpp"
#include "ugid.hpp"
#include "fuse.h"
#include <string>
#include <vector>
#include <string.h>
static const char SECURITY_CAPABILITY[] = "security.capability";
using std::string;
using std::vector;
namespace l
{
static
int
get_error(const PolicyRV &prv_,
const string &basepath_)
{
for(int i = 0, ei = prv_.success.size(); i < ei; i++)
{
if(prv_.success[i].basepath == basepath_)
return prv_.success[i].rv;
}
for(int i = 0, ei = prv_.error.size(); i < ei; i++)
{
if(prv_.error[i].basepath == basepath_)
return prv_.error[i].rv;
}
return 0;
}
static
bool
is_attrname_security_capability(const char *attrname_)
{
return (strcmp(attrname_,SECURITY_CAPABILITY) == 0);
}
static
int
setxattr_controlfile(const string &attrname_,
const string &attrval_,
const int flags_)
{
int rv;
string key;
Config::Write cfg;
if(!str::startswith(attrname_,"user.mergerfs."))
return -ENOATTR;
key = &attrname_[14];
if(cfg->has_key(key) == false)
return -ENOATTR;
if((flags_ & XATTR_CREATE) == XATTR_CREATE)
return -EEXIST;
rv = cfg->set(key,attrval_);
if(rv < 0)
return rv;
fs::statvfs_cache_timeout(cfg->cache_statfs);
return rv;
}
static
void
setxattr_loop_core(const string &basepath_,
const char *fusepath_,
const char *attrname_,
const char *attrval_,
const size_t attrvalsize_,
const int flags_,
PolicyRV *prv_)
{
string fullpath;
fullpath = fs::path::make(basepath_,fusepath_);
errno = 0;
fs::lsetxattr(fullpath,attrname_,attrval_,attrvalsize_,flags_);
prv_->insert(errno,basepath_);
}
static
void
setxattr_loop(const StrVec &basepaths_,
const char *fusepath_,
const char *attrname_,
const char *attrval_,
const size_t attrvalsize_,
const int flags_,
PolicyRV *prv_)
{
for(size_t i = 0, ei = basepaths_.size(); i != ei; i++)
{
l::setxattr_loop_core(basepaths_[i],fusepath_,
attrname_,attrval_,attrvalsize_,
flags_,prv_);
}
}
static
int
setxattr(const Policy::Action &setxattrPolicy_,
const Policy::Search &getxattrPolicy_,
const Branches &branches_,
const char *fusepath_,
const char *attrname_,
const char *attrval_,
const size_t attrvalsize_,
const int flags_)
{
int rv;
PolicyRV prv;
StrVec basepaths;
rv = setxattrPolicy_(branches_,fusepath_,&basepaths);
if(rv == -1)
return -errno;
l::setxattr_loop(basepaths,fusepath_,attrname_,attrval_,attrvalsize_,flags_,&prv);
if(prv.error.empty())
return 0;
if(prv.success.empty())
return prv.error[0].rv;
basepaths.clear();
rv = getxattrPolicy_(branches_,fusepath_,&basepaths);
if(rv == -1)
return -errno;
return l::get_error(prv,basepaths[0]);
}
int
setxattr(const char *fusepath_,
const char *attrname_,
const char *attrval_,
size_t attrvalsize_,
int flags_)
{
Config::Read cfg;
if((cfg->security_capability == false) &&
l::is_attrname_security_capability(attrname_))
return -ENOATTR;
if(cfg->xattr.to_int())
return -cfg->xattr.to_int();
const fuse_context *fc = fuse_get_context();
const ugid::Set ugid(fc->uid,fc->gid);
return l::setxattr(cfg->func.setxattr.policy,
cfg->func.getxattr.policy,
cfg->branches,
fusepath_,
attrname_,
attrval_,
attrvalsize_,
flags_);
}
}
namespace FUSE
{
int
setxattr(const char *fusepath_,
const char *attrname_,
const char *attrval_,
size_t attrvalsize_,
int flags_)
{
if(fusepath_ == CONTROLFILE)
return l::setxattr_controlfile(attrname_,
string(attrval_,attrvalsize_),
flags_);
return l::setxattr(fusepath_,attrname_,attrval_,attrvalsize_,flags_);
}
}